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Willy Tarreau62f52692017-10-08 23:01:42 +02001/*
2 * HTTP/2 mux-demux for connections
3 *
4 * Copyright 2017 Willy Tarreau <w@1wt.eu>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
Willy Tarreaudfd3de82020-06-04 23:46:14 +020013#include <import/eb32tree.h>
Willy Tarreau4c7e4b72020-05-27 12:58:42 +020014#include <haproxy/api.h>
Willy Tarreau6be78492020-06-05 00:00:29 +020015#include <haproxy/cfgparse.h>
Willy Tarreau7ea393d2020-06-04 18:02:10 +020016#include <haproxy/connection.h>
Willy Tarreaubf073142020-06-03 12:04:01 +020017#include <haproxy/h2.h>
Willy Tarreaube327fa2020-06-03 09:09:57 +020018#include <haproxy/hpack-dec.h>
19#include <haproxy/hpack-enc.h>
20#include <haproxy/hpack-tbl.h>
Willy Tarreau87735332020-06-04 09:08:41 +020021#include <haproxy/http_htx.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020022#include <haproxy/htx.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020023#include <haproxy/istbuf.h>
Willy Tarreau36979d92020-06-05 17:27:29 +020024#include <haproxy/log.h>
Willy Tarreau6131d6a2020-06-02 16:48:09 +020025#include <haproxy/net_helper.h>
Willy Tarreau48d25b32020-06-04 18:58:52 +020026#include <haproxy/session-t.h>
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +010027#include <haproxy/stats.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020028#include <haproxy/stream.h>
Willy Tarreau5e539c92020-06-04 20:45:39 +020029#include <haproxy/stream_interface.h>
Willy Tarreauc6d61d72020-06-04 19:02:42 +020030#include <haproxy/trace.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020031
32
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010033/* dummy streams returned for closed, error, refused, idle and states */
Willy Tarreau2a856182017-05-16 15:20:39 +020034static const struct h2s *h2_closed_stream;
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010035static const struct h2s *h2_error_stream;
Willy Tarreau8d0d58b2018-12-23 18:29:12 +010036static const struct h2s *h2_refused_stream;
Willy Tarreau2a856182017-05-16 15:20:39 +020037static const struct h2s *h2_idle_stream;
38
Willy Tarreau5ab6b572017-09-22 08:05:00 +020039/* Connection flags (32 bit), in h2c->flags */
40#define H2_CF_NONE 0x00000000
41
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020042/* Flags indicating why writing to the mux is blocked. */
43#define H2_CF_MUX_MALLOC 0x00000001 // mux blocked on lack of connection's mux buffer
44#define H2_CF_MUX_MFULL 0x00000002 // mux blocked on connection's mux buffer full
45#define H2_CF_MUX_BLOCK_ANY 0x00000003 // aggregate of the mux flags above
46
Willy Tarreau315d8072017-12-10 22:17:57 +010047/* Flags indicating why writing to the demux is blocked.
48 * The first two ones directly affect the ability for the mux to receive data
49 * from the connection. The other ones affect the mux's ability to demux
50 * received data.
51 */
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020052#define H2_CF_DEM_DALLOC 0x00000004 // demux blocked on lack of connection's demux buffer
53#define H2_CF_DEM_DFULL 0x00000008 // demux blocked on connection's demux buffer full
Willy Tarreau315d8072017-12-10 22:17:57 +010054
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020055#define H2_CF_DEM_MBUSY 0x00000010 // demux blocked on connection's mux side busy
56#define H2_CF_DEM_MROOM 0x00000020 // demux blocked on lack of room in mux buffer
57#define H2_CF_DEM_SALLOC 0x00000040 // demux blocked on lack of stream's request buffer
58#define H2_CF_DEM_SFULL 0x00000080 // demux blocked on stream request buffer full
Willy Tarreauf2101912018-07-19 10:11:38 +020059#define H2_CF_DEM_TOOMANY 0x00000100 // demux blocked waiting for some conn_streams to leave
60#define H2_CF_DEM_BLOCK_ANY 0x000001F0 // aggregate of the demux flags above except DALLOC/DFULL
Christopher Fauleta9cc1e82021-07-26 12:06:53 +020061 // (SHORT_READ is also excluded)
62
63#define H2_CF_DEM_SHORT_READ 0x00080200 // demux blocked on incomplete frame
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020064
Willy Tarreau081d4722017-05-16 21:51:05 +020065/* other flags */
Willy Tarreauf2101912018-07-19 10:11:38 +020066#define H2_CF_GOAWAY_SENT 0x00001000 // a GOAWAY frame was successfully sent
67#define H2_CF_GOAWAY_FAILED 0x00002000 // a GOAWAY frame failed to be sent
68#define H2_CF_WAIT_FOR_HS 0x00004000 // We did check that at least a stream was waiting for handshake
Willy Tarreaub3fb56d2018-10-03 13:56:38 +020069#define H2_CF_IS_BACK 0x00008000 // this is an outgoing connection
Willy Tarreau3d4631f2021-01-20 10:53:13 +010070#define H2_CF_WINDOW_OPENED 0x00010000 // demux increased window already advertised
71#define H2_CF_RCVD_SHUT 0x00020000 // a recv() attempt already failed on a shutdown
72#define H2_CF_END_REACHED 0x00040000 // pending data too short with RCVD_SHUT present
Willy Tarreau081d4722017-05-16 21:51:05 +020073
Willy Tarreau5ab6b572017-09-22 08:05:00 +020074/* H2 connection state, in h2c->st0 */
75enum h2_cs {
76 H2_CS_PREFACE, // init done, waiting for connection preface
77 H2_CS_SETTINGS1, // preface OK, waiting for first settings frame
78 H2_CS_FRAME_H, // first settings frame ok, waiting for frame header
79 H2_CS_FRAME_P, // frame header OK, waiting for frame payload
Willy Tarreaua20a5192017-12-27 11:02:06 +010080 H2_CS_FRAME_A, // frame payload OK, trying to send ACK frame
81 H2_CS_FRAME_E, // frame payload OK, trying to send RST frame
Willy Tarreau5ab6b572017-09-22 08:05:00 +020082 H2_CS_ERROR, // send GOAWAY(errcode) and close the connection ASAP
83 H2_CS_ERROR2, // GOAWAY(errcode) sent, close the connection ASAP
84 H2_CS_ENTRIES // must be last
85} __attribute__((packed));
86
Willy Tarreau51330962019-05-26 09:38:07 +020087
Willy Tarreau9c218e72019-05-26 10:08:28 +020088/* 32 buffers: one for the ring's root, rest for the mbuf itself */
89#define H2C_MBUF_CNT 32
Willy Tarreau51330962019-05-26 09:38:07 +020090
Willy Tarreau5ab6b572017-09-22 08:05:00 +020091/* H2 connection descriptor */
92struct h2c {
93 struct connection *conn;
94
95 enum h2_cs st0; /* mux state */
96 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
97
98 /* 16 bit hole here */
99 uint32_t flags; /* connection flags: H2_CF_* */
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100100 uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200101 int32_t max_id; /* highest ID known on this connection, <0 before preface */
102 uint32_t rcvd_c; /* newly received data to ACK for the connection */
103 uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) */
104
105 /* states for the demux direction */
106 struct hpack_dht *ddht; /* demux dynamic header table */
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200107 struct buffer dbuf; /* demux buffer */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200108
109 int32_t dsi; /* demux stream ID (<0 = idle) */
110 int32_t dfl; /* demux frame length (if dsi >= 0) */
111 int8_t dft; /* demux frame type (if dsi >= 0) */
112 int8_t dff; /* demux frame flags (if dsi >= 0) */
Willy Tarreau05e5daf2017-12-11 15:17:36 +0100113 uint8_t dpl; /* demux pad length (part of dfl), init to 0 */
114 /* 8 bit hole here */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200115 int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */
116
117 /* states for the mux direction */
Willy Tarreau51330962019-05-26 09:38:07 +0200118 struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200119 int32_t msi; /* mux stream ID (<0 = idle) */
120 int32_t mfl; /* mux frame length (if dsi >= 0) */
121 int8_t mft; /* mux frame type (if dsi >= 0) */
122 int8_t mff; /* mux frame flags (if dsi >= 0) */
123 /* 16 bit hole here */
124 int32_t miw; /* mux initial window size for all new streams */
125 int32_t mws; /* mux window size. Can be negative. */
126 int32_t mfs; /* mux's max frame size */
127
Willy Tarreauea392822017-10-31 10:02:25 +0100128 int timeout; /* idle timeout duration in ticks */
Willy Tarreau599391a2017-11-24 10:16:00 +0100129 int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */
Willy Tarreau49745612017-12-03 18:56:02 +0100130 unsigned int nb_streams; /* number of streams in the tree */
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200131 unsigned int nb_cs; /* number of attached conn_streams */
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100132 unsigned int nb_reserved; /* number of reserved streams */
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100133 unsigned int stream_cnt; /* total number of streams seen */
Willy Tarreau0b37d652018-10-03 10:33:02 +0200134 struct proxy *proxy; /* the proxy this connection was created for */
Willy Tarreauea392822017-10-31 10:02:25 +0100135 struct task *task; /* timeout management task */
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100136 struct h2_counters *px_counters; /* h2 counters attached to proxy */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200137 struct eb_root streams_by_id; /* all active streams by their ID */
138 struct list send_list; /* list of blocked streams requesting to send */
139 struct list fctl_list; /* list of streams blocked by connection's fctl */
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200140 struct list blocked_list; /* list of streams blocked for other reasons (e.g. sfctl, dep) */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100141 struct buffer_wait buf_wait; /* wait list for buffer allocations */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200142 struct wait_event wait_event; /* To be used if we're waiting for I/Os */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200143};
144
Willy Tarreau18312642017-10-11 07:57:07 +0200145/* H2 stream state, in h2s->st */
146enum h2_ss {
147 H2_SS_IDLE = 0, // idle
148 H2_SS_RLOC, // reserved(local)
149 H2_SS_RREM, // reserved(remote)
150 H2_SS_OPEN, // open
151 H2_SS_HREM, // half-closed(remote)
152 H2_SS_HLOC, // half-closed(local)
Willy Tarreau96060ba2017-10-16 18:34:34 +0200153 H2_SS_ERROR, // an error needs to be sent using RST_STREAM
Willy Tarreau18312642017-10-11 07:57:07 +0200154 H2_SS_CLOSED, // closed
155 H2_SS_ENTRIES // must be last
156} __attribute__((packed));
157
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200158#define H2_SS_MASK(state) (1UL << (state))
159#define H2_SS_IDLE_BIT (1UL << H2_SS_IDLE)
160#define H2_SS_RLOC_BIT (1UL << H2_SS_RLOC)
161#define H2_SS_RREM_BIT (1UL << H2_SS_RREM)
162#define H2_SS_OPEN_BIT (1UL << H2_SS_OPEN)
163#define H2_SS_HREM_BIT (1UL << H2_SS_HREM)
164#define H2_SS_HLOC_BIT (1UL << H2_SS_HLOC)
165#define H2_SS_ERROR_BIT (1UL << H2_SS_ERROR)
166#define H2_SS_CLOSED_BIT (1UL << H2_SS_CLOSED)
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200167
Willy Tarreau18312642017-10-11 07:57:07 +0200168/* HTTP/2 stream flags (32 bit), in h2s->flags */
169#define H2_SF_NONE 0x00000000
170#define H2_SF_ES_RCVD 0x00000001
171#define H2_SF_ES_SENT 0x00000002
172
173#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
174#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
175
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200176/* stream flags indicating the reason the stream is blocked */
177#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200178#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux (must be in send list)
179#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl (must be in fctl list)
180#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl (must be in blocked list)
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200181#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
182
Willy Tarreau454f9052017-10-26 19:40:35 +0200183/* stream flags indicating how data is supposed to be sent */
184#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
Christopher Faulet7d247f02020-12-02 14:26:36 +0100185#define H2_SF_BODYLESS_RESP 0x00000200 /* Bodyless response message */
Christopher Fauletd0db4232021-01-22 11:46:30 +0100186#define H2_SF_BODY_TUNNEL 0x00000400 // Attempt to establish a Tunnelled stream (the result depends on the status code)
187
Willy Tarreau454f9052017-10-26 19:40:35 +0200188
Willy Tarreaud9464162020-01-10 18:25:07 +0100189#define H2_SF_NOTIFIED 0x00000800 // a paused stream was notified to try to send again
Willy Tarreau67434202017-11-06 20:20:51 +0100190#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100191#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100192
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100193#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
194
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200195#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
196#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200197#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200198
Amaury Denoyelle5fb48ea2020-12-11 17:53:04 +0100199#define H2_SF_EXT_CONNECT_SENT 0x00040000 // rfc 8441 an Extended CONNECT has been sent
Amaury Denoyelleefe22762020-12-11 17:53:08 +0100200#define H2_SF_EXT_CONNECT_RCVD 0x00080000 // rfc 8441 an Extended CONNECT has been received and parsed
Christopher Fauletd0db4232021-01-22 11:46:30 +0100201
Amaury Denoyelle5fb48ea2020-12-11 17:53:04 +0100202#define H2_SF_TUNNEL_ABRT 0x00100000 // A tunnel attempt was aborted
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200203
Willy Tarreau18312642017-10-11 07:57:07 +0200204/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
Christopher Fauletfafd1b02020-11-03 18:25:52 +0100205 * it is being processed in the internal HTTP representation (HTX).
Willy Tarreau18312642017-10-11 07:57:07 +0200206 */
207struct h2s {
208 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100209 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200210 struct h2c *h2c;
Willy Tarreau18312642017-10-11 07:57:07 +0200211 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200212 int32_t id; /* stream ID */
213 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200214 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200215 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
216 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200217 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100218 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200219 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Willy Tarreauf96508a2020-01-10 11:12:48 +0100220 struct wait_event *subs; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200221 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Willy Tarreau5723f292020-01-10 15:16:57 +0100222 struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to,
223 * in case there's no other subscription to do it */
Amaury Denoyelle74162742020-12-11 17:53:05 +0100224
225 char upgrade_protocol[16]; /* rfc 8441: requested protocol on Extended CONNECT */
Willy Tarreau18312642017-10-11 07:57:07 +0200226};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200227
Willy Tarreauc6405142017-09-21 20:23:50 +0200228/* descriptor for an h2 frame header */
229struct h2_fh {
230 uint32_t len; /* length, host order, 24 bits */
231 uint32_t sid; /* stream id, host order, 31 bits */
232 uint8_t ft; /* frame type */
233 uint8_t ff; /* frame flags */
234};
235
Willy Tarreau12ae2122019-08-08 18:23:12 +0200236/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200237static void h2_trace(enum trace_level level, uint64_t mask, \
238 const struct trace_source *src,
239 const struct ist where, const struct ist func,
240 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200241
242/* The event representation is split like this :
243 * strm - application layer
244 * h2s - internal H2 stream
245 * h2c - internal H2 connection
246 * conn - external connection
247 *
248 */
249static const struct trace_event h2_trace_events[] = {
250#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200251 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200252#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200253 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200254#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200255 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200256#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200257 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200258#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200259 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200260#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200261 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200262#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200263 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200264#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200265 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200266#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200267 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200268#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200269 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200270#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200271 { .mask = H2_EV_RX_EOI, .name = "rx_eoi", .desc = "receipt of end of H2 input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200272#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200273 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200274#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200275 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200276#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200277 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200278#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200279 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200280#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200281 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200282#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200283 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200284#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200285 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200286#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200287 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200288#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200289 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200290#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200291 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200292#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200293 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200294#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200295 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200296#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200297 { .mask = H2_EV_TX_EOI, .name = "tx_eoi", .desc = "transmission of H2 end of input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200298#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200299 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200300#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200301 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200302#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200303 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200304#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200305 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200306#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200307 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200308#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200309 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200310#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200311 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200312#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200313 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200314#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200315 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200316#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200317 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200318#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200319 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200320#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200321 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200322#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200323 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200324#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200325 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200326#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200327 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200328#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200329 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200330#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200331 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200332#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200333 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200334#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200335 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200336#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200337 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200338#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200339 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200340#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200341 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200342#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200343 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200344#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200345 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200346#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200347 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200348#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200349 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200350#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200351 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200352#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200353 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200354 { }
355};
356
357static const struct name_desc h2_trace_lockon_args[4] = {
358 /* arg1 */ { /* already used by the connection */ },
359 /* arg2 */ { .name="h2s", .desc="H2 stream" },
360 /* arg3 */ { },
361 /* arg4 */ { }
362};
363
364static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200365#define H2_VERB_CLEAN 1
366 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
367#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200368 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200369#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200370 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200371#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200372 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200373#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200374 { .name="complete", .desc="add full data dump when available" },
375 { /* end */ }
376};
377
Willy Tarreau6eb3d372021-04-10 19:29:26 +0200378static struct trace_source trace_h2 __read_mostly = {
Willy Tarreau12ae2122019-08-08 18:23:12 +0200379 .name = IST("h2"),
380 .desc = "HTTP/2 multiplexer",
381 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200382 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200383 .known_events = h2_trace_events,
384 .lockon_args = h2_trace_lockon_args,
385 .decoding = h2_trace_decoding,
386 .report_events = ~0, // report everything by default
387};
388
389#define TRACE_SOURCE &trace_h2
390INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
391
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100392/* h2 stats module */
393enum {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100394 H2_ST_HEADERS_RCVD,
395 H2_ST_DATA_RCVD,
396 H2_ST_SETTINGS_RCVD,
397 H2_ST_RST_STREAM_RCVD,
398 H2_ST_GOAWAY_RCVD,
399
Amaury Denoyellea8879232020-10-27 17:16:03 +0100400 H2_ST_CONN_PROTO_ERR,
401 H2_ST_STRM_PROTO_ERR,
402 H2_ST_RST_STREAM_RESP,
403 H2_ST_GOAWAY_RESP,
404
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100405 H2_ST_OPEN_CONN,
406 H2_ST_OPEN_STREAM,
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100407 H2_ST_TOTAL_CONN,
408 H2_ST_TOTAL_STREAM,
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100409
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100410 H2_STATS_COUNT /* must be the last member of the enum */
411};
412
413static struct name_desc h2_stats[] = {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100414 [H2_ST_HEADERS_RCVD] = { .name = "h2_headers_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100415 .desc = "Total number of received HEADERS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100416 [H2_ST_DATA_RCVD] = { .name = "h2_data_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100417 .desc = "Total number of received DATA frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100418 [H2_ST_SETTINGS_RCVD] = { .name = "h2_settings_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100419 .desc = "Total number of received SETTINGS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100420 [H2_ST_RST_STREAM_RCVD] = { .name = "h2_rst_stream_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100421 .desc = "Total number of received RST_STREAM frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100422 [H2_ST_GOAWAY_RCVD] = { .name = "h2_goaway_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100423 .desc = "Total number of received GOAWAY frames" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100424
425 [H2_ST_CONN_PROTO_ERR] = { .name = "h2_detected_conn_protocol_errors",
426 .desc = "Total number of connection protocol errors" },
427 [H2_ST_STRM_PROTO_ERR] = { .name = "h2_detected_strm_protocol_errors",
428 .desc = "Total number of stream protocol errors" },
429 [H2_ST_RST_STREAM_RESP] = { .name = "h2_rst_stream_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100430 .desc = "Total number of RST_STREAM sent on detected error" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100431 [H2_ST_GOAWAY_RESP] = { .name = "h2_goaway_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100432 .desc = "Total number of GOAWAY sent on detected error" },
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100433
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100434 [H2_ST_OPEN_CONN] = { .name = "h2_open_connections",
435 .desc = "Count of currently open connections" },
436 [H2_ST_OPEN_STREAM] = { .name = "h2_backend_open_streams",
437 .desc = "Count of currently open streams" },
Amaury Denoyelle377d8782021-02-03 16:27:22 +0100438 [H2_ST_TOTAL_CONN] = { .name = "h2_total_connections",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100439 .desc = "Total number of connections" },
Amaury Denoyelle377d8782021-02-03 16:27:22 +0100440 [H2_ST_TOTAL_STREAM] = { .name = "h2_backend_total_streams",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100441 .desc = "Total number of streams" },
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100442};
443
444static struct h2_counters {
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100445 long long headers_rcvd; /* total number of HEADERS frame received */
446 long long data_rcvd; /* total number of DATA frame received */
447 long long settings_rcvd; /* total number of SETTINGS frame received */
448 long long rst_stream_rcvd; /* total number of RST_STREAM frame received */
449 long long goaway_rcvd; /* total number of GOAWAY frame received */
Amaury Denoyellea8879232020-10-27 17:16:03 +0100450
451 long long conn_proto_err; /* total number of protocol errors detected */
452 long long strm_proto_err; /* total number of protocol errors detected */
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100453 long long rst_stream_resp; /* total number of RST_STREAM frame sent on error */
454 long long goaway_resp; /* total number of GOAWAY frame sent on error */
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100455
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100456 long long open_conns; /* count of currently open connections */
457 long long open_streams; /* count of currently open streams */
458 long long total_conns; /* total number of connections */
459 long long total_streams; /* total number of streams */
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100460} h2_counters;
461
462static void h2_fill_stats(void *data, struct field *stats)
463{
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100464 struct h2_counters *counters = data;
465
466 stats[H2_ST_HEADERS_RCVD] = mkf_u64(FN_COUNTER, counters->headers_rcvd);
467 stats[H2_ST_DATA_RCVD] = mkf_u64(FN_COUNTER, counters->data_rcvd);
468 stats[H2_ST_SETTINGS_RCVD] = mkf_u64(FN_COUNTER, counters->settings_rcvd);
469 stats[H2_ST_RST_STREAM_RCVD] = mkf_u64(FN_COUNTER, counters->rst_stream_rcvd);
470 stats[H2_ST_GOAWAY_RCVD] = mkf_u64(FN_COUNTER, counters->goaway_rcvd);
Amaury Denoyellea8879232020-10-27 17:16:03 +0100471
472 stats[H2_ST_CONN_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->conn_proto_err);
473 stats[H2_ST_STRM_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->strm_proto_err);
474 stats[H2_ST_RST_STREAM_RESP] = mkf_u64(FN_COUNTER, counters->rst_stream_resp);
475 stats[H2_ST_GOAWAY_RESP] = mkf_u64(FN_COUNTER, counters->goaway_resp);
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100476
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100477 stats[H2_ST_OPEN_CONN] = mkf_u64(FN_GAUGE, counters->open_conns);
478 stats[H2_ST_OPEN_STREAM] = mkf_u64(FN_GAUGE, counters->open_streams);
479 stats[H2_ST_TOTAL_CONN] = mkf_u64(FN_COUNTER, counters->total_conns);
480 stats[H2_ST_TOTAL_STREAM] = mkf_u64(FN_COUNTER, counters->total_streams);
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100481}
482
483static struct stats_module h2_stats_module = {
484 .name = "h2",
485 .fill_stats = h2_fill_stats,
486 .stats = h2_stats,
487 .stats_count = H2_STATS_COUNT,
488 .counters = &h2_counters,
489 .counters_size = sizeof(h2_counters),
490 .domain_flags = MK_STATS_PROXY_DOMAIN(STATS_PX_CAP_FE|STATS_PX_CAP_BE),
491 .clearable = 1,
492};
493
494INITCALL1(STG_REGISTER, stats_register_module, &h2_stats_module);
495
Willy Tarreau8ceae722018-11-26 11:58:30 +0100496/* the h2c connection pool */
497DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
498
499/* the h2s stream pool */
500DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
501
Willy Tarreaudc572362018-12-12 08:08:05 +0100502/* The default connection window size is 65535, it may only be enlarged using
503 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
504 * we'll pretend we already received the difference between the two to send
505 * an equivalent window update to enlarge it to 2G-1.
506 */
507#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
508
Willy Tarreau455d5682019-05-24 19:42:18 +0200509/* maximum amount of data we're OK with re-aligning for buffer optimizations */
510#define MAX_DATA_REALIGN 1024
511
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200512/* a few settings from the global section */
513static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200514static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100515static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100516static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200517
Willy Tarreau2a856182017-05-16 15:20:39 +0200518/* a dmumy closed stream */
519static const struct h2s *h2_closed_stream = &(const struct h2s){
520 .cs = NULL,
521 .h2c = NULL,
522 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100523 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100524 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200525 .id = 0,
526};
527
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100528/* a dmumy closed stream returning a PROTOCOL_ERROR error */
529static const struct h2s *h2_error_stream = &(const struct h2s){
530 .cs = NULL,
531 .h2c = NULL,
532 .st = H2_SS_CLOSED,
533 .errcode = H2_ERR_PROTOCOL_ERROR,
534 .flags = 0,
535 .id = 0,
536};
537
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100538/* a dmumy closed stream returning a REFUSED_STREAM error */
539static const struct h2s *h2_refused_stream = &(const struct h2s){
540 .cs = NULL,
541 .h2c = NULL,
542 .st = H2_SS_CLOSED,
543 .errcode = H2_ERR_REFUSED_STREAM,
544 .flags = 0,
545 .id = 0,
546};
547
Willy Tarreau2a856182017-05-16 15:20:39 +0200548/* and a dummy idle stream for use with any unannounced stream */
549static const struct h2s *h2_idle_stream = &(const struct h2s){
550 .cs = NULL,
551 .h2c = NULL,
552 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100553 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200554 .id = 0,
555};
556
Willy Tarreau144f84a2021-03-02 16:09:26 +0100557struct task *h2_timeout_task(struct task *t, void *context, unsigned int state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200558static int h2_send(struct h2c *h2c);
559static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200560static int h2_process(struct h2c *h2c);
Willy Tarreau691d5032021-01-20 14:55:01 +0100561/* h2_io_cb is exported to see it resolved in "show fd" */
Willy Tarreau144f84a2021-03-02 16:09:26 +0100562struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100563static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Amaury Denoyelle74162742020-12-11 17:53:05 +0100564static int h2c_decode_headers(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len, char *upgrade_protocol);
Willy Tarreaua56a6de2018-02-26 15:59:07 +0100565static int h2_frt_transfer_data(struct h2s *h2s);
Willy Tarreau144f84a2021-03-02 16:09:26 +0100566struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100567static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100568static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200569
Willy Tarreauab2ec452019-08-30 07:07:08 +0200570/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
571static inline const char *h2c_st_to_str(enum h2_cs st)
572{
573 switch (st) {
574 case H2_CS_PREFACE: return "PRF";
575 case H2_CS_SETTINGS1: return "STG";
576 case H2_CS_FRAME_H: return "FRH";
577 case H2_CS_FRAME_P: return "FRP";
578 case H2_CS_FRAME_A: return "FRA";
579 case H2_CS_FRAME_E: return "FRE";
580 case H2_CS_ERROR: return "ERR";
581 case H2_CS_ERROR2: return "ER2";
582 default: return "???";
583 }
584}
585
586/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
587static inline const char *h2s_st_to_str(enum h2_ss st)
588{
589 switch (st) {
590 case H2_SS_IDLE: return "IDL"; // idle
591 case H2_SS_RLOC: return "RSL"; // reserved local
592 case H2_SS_RREM: return "RSR"; // reserved remote
593 case H2_SS_OPEN: return "OPN"; // open
594 case H2_SS_HREM: return "HCR"; // half-closed remote
595 case H2_SS_HLOC: return "HCL"; // half-closed local
596 case H2_SS_ERROR : return "ERR"; // error
597 case H2_SS_CLOSED: return "CLO"; // closed
598 default: return "???";
599 }
600}
601
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200602/* the H2 traces always expect that arg1, if non-null, is of type connection
603 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
604 * that arg3, if non-null, is either of type htx for tx headers, or of type
605 * buffer for everything else.
606 */
607static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
608 const struct ist where, const struct ist func,
609 const void *a1, const void *a2, const void *a3, const void *a4)
610{
611 const struct connection *conn = a1;
612 const struct h2c *h2c = conn ? conn->ctx : NULL;
613 const struct h2s *h2s = a2;
614 const struct buffer *buf = a3;
615 const struct htx *htx;
616 int pos;
617
618 if (!h2c) // nothing to add
619 return;
620
Willy Tarreau17104d42019-08-30 07:12:55 +0200621 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200622 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
623
Willy Tarreaue2f68e92021-06-16 17:47:24 +0200624 if (mask & H2_EV_H2C_NEW) // inside h2_init, otherwise it's hard to match conn & h2c
625 conn_append_debug_info(&trace_buf, conn, " : ");
626
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100627 if (h2c->errcode)
628 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode);
629
Willy Tarreau73db4342019-09-25 07:28:44 +0200630 if (h2c->dsi >= 0 &&
631 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
Willy Tarreau8520d872020-09-18 07:39:29 +0200632 chunk_appendf(&trace_buf, " dft=%s/%02x dfl=%d", h2_ft_str(h2c->dft), h2c->dff, h2c->dfl);
Willy Tarreau73db4342019-09-25 07:28:44 +0200633 }
634
635 if (h2s) {
636 if (h2s->id <= 0)
637 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
638 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100639 if (h2s->id && h2s->errcode)
640 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode);
Willy Tarreau73db4342019-09-25 07:28:44 +0200641 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200642 }
643
644 /* Let's dump decoded requests and responses right after parsing. They
645 * are traced at level USER with a few recognizable flags.
646 */
647 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
648 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
649 htx = htxbuf(buf); // recv req/res
650 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
651 htx = a3; // send req/res
652 else
653 htx = NULL;
654
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200655 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200656 const struct htx_blk *blk = htx_get_blk(htx, pos);
657 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
658 enum htx_blk_type type = htx_get_blk_type(blk);
659
660 if (type == HTX_BLK_REQ_SL)
661 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200662 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200663 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
664 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
665 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
666 else if (type == HTX_BLK_RES_SL)
667 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200668 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200669 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
670 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
671 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
672 }
673}
674
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200675
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100676/* Detect a pending read0 for a H2 connection. It happens if a read0 was
677 * already reported on a previous xprt->rcvbuf() AND a frame parser failed
678 * to parse pending data, confirming no more progress is possible because
679 * we're facing a truncated frame. The function returns 1 to report a read0
680 * or 0 otherwise.
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200681 */
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100682static inline int h2c_read0_pending(struct h2c *h2c)
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200683{
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100684 return !!(h2c->flags & H2_CF_END_REACHED);
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200685}
686
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200687/* returns true if the connection is allowed to expire, false otherwise. A
688 * connection may expire when:
689 * - it has no stream
690 * - it has data in the mux buffer
691 * - it has streams in the blocked list
692 * - it has streams in the fctl list
693 * - it has streams in the send list
694 * Otherwise it means some streams are waiting in the data layer and it should
695 * not expire.
696 */
697static inline int h2c_may_expire(const struct h2c *h2c)
698{
699 return eb_is_empty(&h2c->streams_by_id) ||
700 br_data(h2c->mbuf) ||
701 !LIST_ISEMPTY(&h2c->blocked_list) ||
702 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100703 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200704}
705
Olivier Houchard7a977432019-03-21 15:47:13 +0100706static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200707h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100708{
709 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
710 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
711 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
712 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200713 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100714 (conn_xprt_read0_pending(h2c->conn) ||
715 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
716 return 1;
717
718 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100719}
720
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200721/*****************************************************/
722/* functions below are for dynamic buffer management */
723/*****************************************************/
724
Willy Tarreau315d8072017-12-10 22:17:57 +0100725/* indicates whether or not the we may call the h2_recv() function to attempt
726 * to receive data into the buffer and/or demux pending data. The condition is
727 * a bit complex due to some API limits for now. The rules are the following :
728 * - if an error or a shutdown was detected on the connection and the buffer
729 * is empty, we must not attempt to receive
730 * - if the demux buf failed to be allocated, we must not try to receive and
731 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100732 * - if no flag indicates a blocking condition, we may attempt to receive,
733 * regardless of whether the demux buffer is full or not, so that only
734 * de demux part decides whether or not to block. This is needed because
735 * the connection API indeed prevents us from re-enabling receipt that is
736 * already enabled in a polled state, so we must always immediately stop
737 * as soon as the demux can't proceed so as never to hit an end of read
738 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100739 * - otherwise must may not attempt
740 */
741static inline int h2_recv_allowed(const struct h2c *h2c)
742{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200743 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100744 (h2c->st0 >= H2_CS_ERROR ||
745 h2c->conn->flags & CO_FL_ERROR ||
746 conn_xprt_read0_pending(h2c->conn)))
747 return 0;
748
749 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100750 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100751 return 1;
752
753 return 0;
754}
755
Willy Tarreau47b515a2018-12-21 16:09:41 +0100756/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200757static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100758{
759 if (!h2_recv_allowed(h2c))
760 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200761 if ((!consider_buffer || !b_data(&h2c->dbuf))
762 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100763 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200764 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100765}
766
767
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100768/* returns true if the front connection has too many conn_streams attached */
769static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200770{
Willy Tarreaua8754662018-12-23 20:43:58 +0100771 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200772}
773
Willy Tarreau44e973f2018-03-01 17:49:30 +0100774/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
775 * flags are used to figure what buffer was requested. It returns 1 if the
776 * allocation succeeds, in which case the connection is woken up, or 0 if it's
777 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200778 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100779static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200780{
781 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100782 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200783
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100784 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc(&h2c->dbuf)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200785 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200786 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200787 return 1;
788 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200789
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100790 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc(br_tail(h2c->mbuf))) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100791 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200792
793 if (h2c->flags & H2_CF_DEM_MROOM) {
794 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200795 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200796 }
Willy Tarreau14398122017-09-22 14:26:04 +0200797 return 1;
798 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100799
800 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
801 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100802 b_alloc(&h2s->rxbuf)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100803 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200804 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100805 return 1;
806 }
807
Willy Tarreau14398122017-09-22 14:26:04 +0200808 return 0;
809}
810
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200811static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200812{
813 struct buffer *buf = NULL;
814
Willy Tarreau2b718102021-04-21 07:32:39 +0200815 if (likely(!LIST_INLIST(&h2c->buf_wait.list)) &&
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100816 unlikely((buf = b_alloc(bptr)) == NULL)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100817 h2c->buf_wait.target = h2c;
818 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau2b718102021-04-21 07:32:39 +0200819 LIST_APPEND(&ti->buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200820 }
821 return buf;
822}
823
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200824static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200825{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200826 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100827 b_free(bptr);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +0100828 offer_buffers(NULL, 1);
Willy Tarreau14398122017-09-22 14:26:04 +0200829 }
830}
831
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200832static inline void h2_release_mbuf(struct h2c *h2c)
833{
834 struct buffer *buf;
835 unsigned int count = 0;
836
837 while (b_size(buf = br_head_pick(h2c->mbuf))) {
838 b_free(buf);
839 count++;
840 }
841 if (count)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +0100842 offer_buffers(NULL, count);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200843}
844
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100845/* returns the number of allocatable outgoing streams for the connection taking
846 * the last_sid and the reserved ones into account.
847 */
848static inline int h2_streams_left(const struct h2c *h2c)
849{
850 int ret;
851
852 /* consider the number of outgoing streams we're allowed to create before
853 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
854 * nb_reserved is the number of streams which don't yet have an ID.
855 */
856 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
857 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
858 if (ret < 0)
859 ret = 0;
860 return ret;
861}
862
Willy Tarreau00f18a32019-01-26 12:19:01 +0100863/* returns the number of streams in use on a connection to figure if it's
864 * idle or not. We check nb_cs and not nb_streams as the caller will want
865 * to know if it was the last one after a detach().
866 */
867static int h2_used_streams(struct connection *conn)
868{
869 struct h2c *h2c = conn->ctx;
870
871 return h2c->nb_cs;
872}
873
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100874/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100875static int h2_avail_streams(struct connection *conn)
876{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100877 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100878 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100879 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100880
Willy Tarreau6afec462019-01-28 06:40:19 +0100881 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
882 * streams on the connection.
883 */
884 if (h2c->last_sid >= 0)
885 return 0;
886
Willy Tarreauc61966f2019-10-31 15:10:03 +0100887 if (h2c->st0 >= H2_CS_ERROR)
888 return 0;
889
Willy Tarreau86949782019-01-31 10:42:05 +0100890 /* note: may be negative if a SETTINGS frame changes the limit */
891 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100892
893 /* we must also consider the limit imposed by stream IDs */
894 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100895 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100896 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100897 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
898 ret1 = MIN(ret1, ret2);
899 }
900 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100901}
902
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200903
Willy Tarreau62f52692017-10-08 23:01:42 +0200904/*****************************************************************/
905/* functions below are dedicated to the mux setup and management */
906/*****************************************************************/
907
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200908/* Initialize the mux once it's attached. For outgoing connections, the context
909 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200910 * connections from the fact that the context is still NULL (even during mux
911 * upgrades). <input> is always used as Input buffer and may contain data. It is
912 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200913 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200914static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
915 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200916{
917 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100918 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200919 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200920
Christopher Fauletf81ef032019-10-04 15:19:43 +0200921 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200922
Willy Tarreaubafbe012017-11-24 17:34:44 +0100923 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200924 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200925 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200926
Christopher Faulete9b70722019-04-08 10:46:02 +0200927 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200928 h2c->flags = H2_CF_IS_BACK;
929 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
930 if (tick_isset(prx->timeout.serverfin))
931 h2c->shut_timeout = prx->timeout.serverfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100932
933 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be,
934 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200935 } else {
936 h2c->flags = H2_CF_NONE;
937 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
938 if (tick_isset(prx->timeout.clientfin))
939 h2c->shut_timeout = prx->timeout.clientfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100940
941 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe,
942 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200943 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100944
Willy Tarreau0b37d652018-10-03 10:33:02 +0200945 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100946 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100947 if (tick_isset(h2c->timeout)) {
948 t = task_new(tid_bit);
949 if (!t)
950 goto fail;
951
952 h2c->task = t;
953 t->process = h2_timeout_task;
954 t->context = h2c;
955 t->expire = tick_add(now_ms, h2c->timeout);
956 }
Willy Tarreauea392822017-10-31 10:02:25 +0100957
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200958 h2c->wait_event.tasklet = tasklet_new();
959 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200960 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200961 h2c->wait_event.tasklet->process = h2_io_cb;
962 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100963 h2c->wait_event.events = 0;
Amaury Denoyelled3a88c12021-05-03 10:47:51 +0200964 if (!conn_is_back(conn)) {
965 /* Connection might already be in the stopping_list if subject
966 * to h1->h2 upgrade.
967 */
968 if (!LIST_INLIST(&conn->stopping_list)) {
969 LIST_APPEND(&mux_stopping_data[tid].list,
970 &conn->stopping_list);
971 }
972 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200973
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200974 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200975 if (!h2c->ddht)
976 goto fail;
977
978 /* Initialise the context. */
979 h2c->st0 = H2_CS_PREFACE;
980 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100981 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200982 h2c->max_id = -1;
983 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100984 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200985 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100986 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200987 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100988 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100989 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200990
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200991 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200992 h2c->dsi = -1;
993 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100994
Willy Tarreau32218eb2017-09-22 08:07:25 +0200995 h2c->last_sid = -1;
996
Willy Tarreau51330962019-05-26 09:38:07 +0200997 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200998 h2c->miw = 65535; /* mux initial window size */
999 h2c->mws = 65535; /* mux window size */
1000 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +02001001 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +02001002 LIST_INIT(&h2c->send_list);
1003 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02001004 LIST_INIT(&h2c->blocked_list);
Willy Tarreau90f366b2021-02-20 11:49:49 +01001005 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001006
Christopher Fauletf81ef032019-10-04 15:19:43 +02001007 conn->ctx = h2c;
1008
Willy Tarreaue2f68e92021-06-16 17:47:24 +02001009 TRACE_USER("new H2 connection", H2_EV_H2C_NEW, conn);
1010
Willy Tarreau3f133572017-10-31 19:21:06 +01001011 if (t)
1012 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +01001013
Willy Tarreau01b44822018-10-03 14:26:37 +02001014 if (h2c->flags & H2_CF_IS_BACK) {
1015 /* FIXME: this is temporary, for outgoing connections we need
1016 * to immediately allocate a stream until the code is modified
1017 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +02001018 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +02001019 */
1020 struct h2s *h2s;
1021
Christopher Fauletf81ef032019-10-04 15:19:43 +02001022 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +02001023 if (!h2s)
1024 goto fail_stream;
1025 }
1026
Willy Tarreau4781b152021-04-06 13:53:36 +02001027 HA_ATOMIC_INC(&h2c->px_counters->open_conns);
1028 HA_ATOMIC_INC(&h2c->px_counters->total_conns);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001029
Willy Tarreau0f383582018-10-03 14:22:21 +02001030 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02001031 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001032 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001033 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +02001034 fail_stream:
1035 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +02001036 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +02001037 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001038 if (h2c->wait_event.tasklet)
1039 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +01001040 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +02001041 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +02001042 conn->ctx = conn_ctx; /* restore saved ctx */
1043 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001044 return -1;
1045}
1046
Willy Tarreau751f2d02018-10-05 09:35:00 +02001047/* returns the next allocatable outgoing stream ID for the H2 connection, or
1048 * -1 if no more is allocatable.
1049 */
1050static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
1051{
1052 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +01001053
1054 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +02001055 id = -1;
1056 return id;
1057}
1058
Willy Tarreau2373acc2017-10-12 17:35:14 +02001059/* returns the stream associated with id <id> or NULL if not found */
1060static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
1061{
1062 struct eb32_node *node;
1063
Willy Tarreau751f2d02018-10-05 09:35:00 +02001064 if (id == 0)
1065 return (struct h2s *)h2_closed_stream;
1066
Willy Tarreau2a856182017-05-16 15:20:39 +02001067 if (id > h2c->max_id)
1068 return (struct h2s *)h2_idle_stream;
1069
Willy Tarreau2373acc2017-10-12 17:35:14 +02001070 node = eb32_lookup(&h2c->streams_by_id, id);
1071 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +02001072 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +02001073
1074 return container_of(node, struct h2s, by_id);
1075}
1076
Christopher Faulet73c12072019-04-08 11:23:22 +02001077/* release function. This one should be called to free all resources allocated
1078 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +02001079 */
Christopher Faulet73c12072019-04-08 11:23:22 +02001080static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02001081{
William Dauchy477757c2020-08-07 22:19:23 +02001082 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001083
Willy Tarreau7838a792019-08-12 18:42:03 +02001084 TRACE_ENTER(H2_EV_H2C_END);
1085
Willy Tarreau32218eb2017-09-22 08:07:25 +02001086 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +02001087 /* The connection must be aattached to this mux to be released */
1088 if (h2c->conn && h2c->conn->ctx == h2c)
1089 conn = h2c->conn;
1090
Willy Tarreau7838a792019-08-12 18:42:03 +02001091 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001092 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +02001093
Willy Tarreau2b718102021-04-21 07:32:39 +02001094 if (LIST_INLIST(&h2c->buf_wait.list))
Willy Tarreau90f366b2021-02-20 11:49:49 +01001095 LIST_DEL_INIT(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +02001096
Willy Tarreau44e973f2018-03-01 17:49:30 +01001097 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +02001098 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +01001099
Willy Tarreauea392822017-10-31 10:02:25 +01001100 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +02001101 h2c->task->context = NULL;
1102 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +01001103 h2c->task = NULL;
1104 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001105 if (h2c->wait_event.tasklet)
1106 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +02001107 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01001108 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +02001109 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +01001110
Willy Tarreau4781b152021-04-06 13:53:36 +02001111 HA_ATOMIC_DEC(&h2c->px_counters->open_conns);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001112
Willy Tarreaubafbe012017-11-24 17:34:44 +01001113 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001114 }
1115
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001116 if (conn) {
Amaury Denoyelled3a88c12021-05-03 10:47:51 +02001117 if (!conn_is_back(conn))
1118 LIST_DEL_INIT(&conn->stopping_list);
1119
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001120 conn->mux = NULL;
1121 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02001122 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001123
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001124 conn_stop_tracking(conn);
1125 conn_full_close(conn);
1126 if (conn->destroy_cb)
1127 conn->destroy_cb(conn);
1128 conn_free(conn);
1129 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001130
1131 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +02001132}
1133
1134
Willy Tarreau71681172017-10-23 14:39:06 +02001135/******************************************************/
1136/* functions below are for the H2 protocol processing */
1137/******************************************************/
1138
1139/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +01001140static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +02001141{
1142 return h2s ? h2s->id : 0;
1143}
1144
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001145/* returns the sum of the stream's own window size and the mux's initial
1146 * window, which together form the stream's effective window size.
1147 */
1148static inline int h2s_mws(const struct h2s *h2s)
1149{
1150 return h2s->sws + h2s->h2c->miw;
1151}
1152
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001153/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001154static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001155{
1156 if (h2c->msi < 0)
1157 return 0;
1158
1159 if (h2c->msi == h2s_id(h2s))
1160 return 0;
1161
1162 return 1;
1163}
1164
Willy Tarreau741d6df2017-10-17 08:00:59 +02001165/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001166static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001167{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001168 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001169 h2c->errcode = err;
1170 h2c->st0 = H2_CS_ERROR;
1171}
1172
Willy Tarreau175cebb2019-01-24 10:02:24 +01001173/* marks an error on the stream. It may also update an already closed stream
1174 * (e.g. to report an error after an RST was received).
1175 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001176static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001177{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001178 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001179 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001180 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001181 if (h2s->st < H2_SS_ERROR)
1182 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001183 if (h2s->cs)
1184 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001185 }
1186}
1187
Willy Tarreau7e094452018-12-19 18:08:52 +01001188/* attempt to notify the data layer of recv availability */
1189static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1190{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001191 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001192 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001193 tasklet_wakeup(h2s->subs->tasklet);
1194 h2s->subs->events &= ~SUB_RETRY_RECV;
1195 if (!h2s->subs->events)
1196 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001197 }
1198}
1199
1200/* attempt to notify the data layer of send availability */
1201static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1202{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001203 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001204 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001205 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001206 tasklet_wakeup(h2s->subs->tasklet);
1207 h2s->subs->events &= ~SUB_RETRY_SEND;
1208 if (!h2s->subs->events)
1209 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001210 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001211 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1212 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1213 tasklet_wakeup(h2s->shut_tl);
1214 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001215}
1216
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001217/* alerts the data layer, trying to wake it up by all means, following
1218 * this sequence :
1219 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1220 * - if its subscribed to send, then it's woken up for send
1221 * - if it was subscribed to neither, its ->wake() callback is called
1222 * It is safe to call this function with a closed stream which doesn't have a
1223 * conn_stream anymore.
1224 */
1225static void __maybe_unused h2s_alert(struct h2s *h2s)
1226{
Willy Tarreau7838a792019-08-12 18:42:03 +02001227 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1228
Willy Tarreauf96508a2020-01-10 11:12:48 +01001229 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001230 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001231 h2s_notify_recv(h2s);
1232 h2s_notify_send(h2s);
1233 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001234 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1235 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001236 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001237 }
1238
1239 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001240}
1241
Willy Tarreaue4820742017-07-27 13:37:23 +02001242/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001243static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001244{
1245 uint8_t *out = frame;
1246
1247 *out = len >> 16;
1248 write_n16(out + 1, len);
1249}
1250
Willy Tarreau54c15062017-10-10 17:10:03 +02001251/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1252 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1253 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001254 * available in the buffer's input prior to calling this function. The buffer
1255 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001256 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001257static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001258 const struct buffer *b, int o)
1259{
Willy Tarreau591d4452018-06-15 17:21:00 +02001260 readv_bytes(dst, bytes, b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001261}
1262
Willy Tarreau1f094672017-11-20 21:27:45 +01001263static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001264{
Willy Tarreau591d4452018-06-15 17:21:00 +02001265 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001266}
1267
Willy Tarreau1f094672017-11-20 21:27:45 +01001268static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001269{
Willy Tarreau591d4452018-06-15 17:21:00 +02001270 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001271}
1272
Willy Tarreau1f094672017-11-20 21:27:45 +01001273static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001274{
Willy Tarreau591d4452018-06-15 17:21:00 +02001275 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001276}
1277
1278
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001279/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1280 * The algorithm is not obvious. It turns out that H2 headers are neither
1281 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1282 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001283 *
1284 * b0 b1 b2 b3 b4 b5..b8
1285 * +----------+---------+--------+----+----+----------------------+
1286 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1287 * +----------+---------+--------+----+----+----------------------+
1288 *
1289 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1290 * we get the sid properly aligned and ordered, and 16 bits of len properly
1291 * ordered as well. The type and flags can be extracted using bit shifts from
1292 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001293 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1294 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001295 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001296static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001297{
1298 uint64_t w;
1299
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001300 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001301 return 0;
1302
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001303 w = h2_get_n64(b, o + 1);
1304 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001305 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1306 h->ff = w >> 32;
1307 h->ft = w >> 40;
1308 h->len += w >> 48;
1309 return 1;
1310}
1311
1312/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1313 * h2_peek_frame_hdr() above.
1314 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001315static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001316{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001317 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001318}
1319
1320/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001321static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001322{
1323 int ret;
1324
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001325 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001326 if (ret > 0)
1327 h2_skip_frame_hdr(b);
1328 return ret;
1329}
1330
Willy Tarreaucb985a42019-10-07 16:56:34 +02001331
1332/* try to fragment the headers frame present at the beginning of buffer <b>,
1333 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1334 * success. Typical causes of failure include a buffer not large enough to
1335 * add extra frame headers. The existing frame size is read in the current
1336 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1337 * and its length will be adjusted. The stream ID for continuation frames will
1338 * be copied from the initial frame's.
1339 */
1340static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1341{
1342 size_t remain = b->data - 9;
1343 int extra_frames = (remain - 1) / mfs;
1344 size_t fsize;
1345 char *fptr;
1346 int frame;
1347
1348 if (b->data <= mfs + 9)
1349 return 1;
1350
1351 /* Too large a frame, we need to fragment it using CONTINUATION
1352 * frames. We start from the end and move tails as needed.
1353 */
1354 if (b->data + extra_frames * 9 > b->size)
1355 return 0;
1356
1357 for (frame = extra_frames; frame; frame--) {
1358 fsize = ((remain - 1) % mfs) + 1;
1359 remain -= fsize;
1360
1361 /* move data */
1362 fptr = b->area + 9 + remain + (frame - 1) * 9;
1363 memmove(fptr + 9, b->area + 9 + remain, fsize);
1364 b->data += 9;
1365
1366 /* write new frame header */
1367 h2_set_frame_size(fptr, fsize);
1368 fptr[3] = H2_FT_CONTINUATION;
1369 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1370 write_n32(fptr + 5, read_n32(b->area + 5));
1371 }
1372
1373 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1374 h2_set_frame_size(b->area, remain);
1375 return 1;
1376}
1377
1378
Willy Tarreau00dd0782018-03-01 16:31:34 +01001379/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1380 * its connection if the stream was not yet closed. Please use this exclusively
1381 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001382 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001383static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001384{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001385 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001386 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001387 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001388 if (!h2s->id)
1389 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001390 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001391 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1392 h2s_notify_recv(h2s);
1393 }
Willy Tarreau4781b152021-04-06 13:53:36 +02001394 HA_ATOMIC_DEC(&h2s->h2c->px_counters->open_streams);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001395
Willy Tarreau7838a792019-08-12 18:42:03 +02001396 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001397 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001398 h2s->st = H2_SS_CLOSED;
1399}
1400
Willy Tarreau71049cc2018-03-28 13:56:39 +02001401/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001402/* h2s_destroy should only ever be called by the thread that owns the stream,
1403 * that means that a tasklet should be used if we want to destroy the h2s
1404 * from another thread
1405 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001406static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001407{
Willy Tarreau7838a792019-08-12 18:42:03 +02001408 struct connection *conn = h2s->h2c->conn;
1409
1410 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1411
Willy Tarreau0a10de62018-03-01 16:27:53 +01001412 h2s_close(h2s);
1413 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001414 if (b_size(&h2s->rxbuf)) {
1415 b_free(&h2s->rxbuf);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01001416 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02001417 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001418
1419 if (h2s->subs)
1420 h2s->subs->events = 0;
1421
Joseph Herlantd77575d2018-11-25 10:54:45 -08001422 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001423 * reference left would be in the h2c send_list/fctl_list, and if
1424 * we're in it, we're getting out anyway
1425 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001426 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001427
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001428 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001429 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001430 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001431
1432 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001433}
1434
Willy Tarreaua8e49542018-10-03 18:53:55 +02001435/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1436 * stream tree. In case of error, nothing is added and NULL is returned. The
1437 * causes of errors can be any failed memory allocation. The caller is
1438 * responsible for checking if the connection may support an extra stream
1439 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001440 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001441static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001442{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001443 struct h2s *h2s;
1444
Willy Tarreau7838a792019-08-12 18:42:03 +02001445 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1446
Willy Tarreaubafbe012017-11-24 17:34:44 +01001447 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001448 if (!h2s)
1449 goto out;
1450
Willy Tarreau5723f292020-01-10 15:16:57 +01001451 h2s->shut_tl = tasklet_new();
1452 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001453 pool_free(pool_head_h2s, h2s);
1454 goto out;
1455 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001456 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001457 h2s->shut_tl->process = h2_deferred_shut;
1458 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001459 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001460 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001461 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001462 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001463 h2s->flags = H2_SF_NONE;
1464 h2s->errcode = H2_ERR_NO_ERROR;
1465 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001466 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001467 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001468 h2s->rxbuf = BUF_NULL;
Amaury Denoyelle74162742020-12-11 17:53:05 +01001469 memset(h2s->upgrade_protocol, 0, sizeof(h2s->upgrade_protocol));
Willy Tarreau751f2d02018-10-05 09:35:00 +02001470
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001471 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001472 if (id > 0)
1473 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001474 else
1475 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001476
1477 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001478 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001479 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001480
Willy Tarreau4781b152021-04-06 13:53:36 +02001481 HA_ATOMIC_INC(&h2c->px_counters->open_streams);
1482 HA_ATOMIC_INC(&h2c->px_counters->total_streams);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001483
Willy Tarreau7838a792019-08-12 18:42:03 +02001484 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001485 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001486 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001487 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001488 return NULL;
1489}
1490
1491/* creates a new stream <id> on the h2c connection and returns it, or NULL in
Christopher Faulet7d013e72020-12-15 16:56:50 +01001492 * case of memory allocation error. <input> is used as input buffer for the new
1493 * stream. On success, it is transferred to the stream and the mux is no longer
1494 * responsible of it. On error, <input> is unchanged, thus the mux must still
1495 * take care of it.
Willy Tarreaua8e49542018-10-03 18:53:55 +02001496 */
Christopher Faulet7d013e72020-12-15 16:56:50 +01001497static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id, struct buffer *input)
Willy Tarreaua8e49542018-10-03 18:53:55 +02001498{
1499 struct session *sess = h2c->conn->owner;
1500 struct conn_stream *cs;
1501 struct h2s *h2s;
1502
Willy Tarreau7838a792019-08-12 18:42:03 +02001503 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1504
Willy Tarreaua8e49542018-10-03 18:53:55 +02001505 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1506 goto out;
1507
1508 h2s = h2s_new(h2c, id);
1509 if (!h2s)
1510 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001511
Christopher Faulet236c93b2020-07-02 09:19:54 +02001512 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001513 if (!cs)
1514 goto out_close;
1515
Olivier Houchard746fb772018-12-15 19:42:00 +01001516 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001517 h2s->cs = cs;
1518 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001519 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001520
Christopher Faulet7d013e72020-12-15 16:56:50 +01001521 if (stream_create_from_cs(cs, input) < 0)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001522 goto out_free_cs;
1523
Willy Tarreau590a0512018-09-05 11:56:48 +02001524 /* We want the accept date presented to the next stream to be the one
1525 * we have now, the handshake time to be null (since the next stream
1526 * is not delayed by a handshake), and the idle time to count since
1527 * right now.
1528 */
1529 sess->accept_date = date;
1530 sess->tv_accept = now;
1531 sess->t_handshake = 0;
1532
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001533 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001534 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001535 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001536 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001537 return h2s;
1538
1539 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001540 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001541 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001542 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001543 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001544 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001545 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001546 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001547 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001548 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001549}
1550
Willy Tarreau751f2d02018-10-05 09:35:00 +02001551/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1552 * and returns it, or NULL in case of memory allocation error or if the highest
1553 * possible stream ID was reached.
1554 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001555static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001556{
1557 struct h2s *h2s = NULL;
1558
Willy Tarreau7838a792019-08-12 18:42:03 +02001559 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1560
Willy Tarreau86949782019-01-31 10:42:05 +01001561 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001562 goto out;
1563
Willy Tarreaua80dca82019-01-24 17:08:28 +01001564 if (h2_streams_left(h2c) < 1)
1565 goto out;
1566
Willy Tarreau751f2d02018-10-05 09:35:00 +02001567 /* Defer choosing the ID until we send the first message to create the stream */
1568 h2s = h2s_new(h2c, 0);
1569 if (!h2s)
1570 goto out;
1571
1572 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001573 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001574 cs->ctx = h2s;
1575 h2c->nb_cs++;
1576
Willy Tarreau751f2d02018-10-05 09:35:00 +02001577 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001578 if (likely(h2s))
1579 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1580 else
1581 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001582 return h2s;
1583}
1584
Willy Tarreaube5b7152017-09-25 16:25:39 +02001585/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1586 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1587 * the various settings codes.
1588 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001589static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001590{
1591 struct buffer *res;
1592 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001593 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001594 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001595 int ret = 0;
1596
1597 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001598
1599 if (h2c_mux_busy(h2c, NULL)) {
1600 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001601 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001602 }
1603
Willy Tarreaube5b7152017-09-25 16:25:39 +02001604 chunk_init(&buf, buf_data, sizeof(buf_data));
1605 chunk_memcpy(&buf,
1606 "\x00\x00\x00" /* length : 0 for now */
1607 "\x04\x00" /* type : 4 (settings), flags : 0 */
1608 "\x00\x00\x00\x00", /* stream ID : 0 */
1609 9);
1610
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001611 if (h2c->flags & H2_CF_IS_BACK) {
1612 /* send settings_enable_push=0 */
1613 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1614 }
1615
Amaury Denoyelle0ea2c4f2021-07-09 17:14:30 +02001616 /* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1,
1617 * sent automatically unless disabled in the global config */
1618 if (!(global.tune.options & GTUNE_DISABLE_H2_WEBSOCKET))
1619 chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6);
Amaury Denoyellef9dcbee2020-12-11 17:53:10 +01001620
Willy Tarreaube5b7152017-09-25 16:25:39 +02001621 if (h2_settings_header_table_size != 4096) {
1622 char str[6] = "\x00\x01"; /* header_table_size */
1623
1624 write_n32(str + 2, h2_settings_header_table_size);
1625 chunk_memcat(&buf, str, 6);
1626 }
1627
1628 if (h2_settings_initial_window_size != 65535) {
1629 char str[6] = "\x00\x04"; /* initial_window_size */
1630
1631 write_n32(str + 2, h2_settings_initial_window_size);
1632 chunk_memcat(&buf, str, 6);
1633 }
1634
1635 if (h2_settings_max_concurrent_streams != 0) {
1636 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1637
1638 /* Note: 0 means "unlimited" for haproxy's config but not for
1639 * the protocol, so never send this value!
1640 */
1641 write_n32(str + 2, h2_settings_max_concurrent_streams);
1642 chunk_memcat(&buf, str, 6);
1643 }
1644
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001645 mfs = h2_settings_max_frame_size;
1646 if (mfs > global.tune.bufsize)
1647 mfs = global.tune.bufsize;
1648
1649 if (!mfs)
1650 mfs = global.tune.bufsize;
1651
1652 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001653 char str[6] = "\x00\x05"; /* max_frame_size */
1654
1655 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1656 * match bufsize - rewrite size, but at the moment it seems
1657 * that clients don't take care of it.
1658 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001659 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001660 chunk_memcat(&buf, str, 6);
1661 }
1662
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001663 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001664
1665 res = br_tail(h2c->mbuf);
1666 retry:
1667 if (!h2_get_buf(h2c, res)) {
1668 h2c->flags |= H2_CF_MUX_MALLOC;
1669 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001670 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001671 }
1672
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001673 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001674 if (unlikely(ret <= 0)) {
1675 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001676 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1677 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001678 h2c->flags |= H2_CF_MUX_MFULL;
1679 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001680 }
1681 else {
1682 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001683 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001684 }
1685 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001686 out:
1687 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001688 return ret;
1689}
1690
Willy Tarreau52eed752017-09-22 15:05:09 +02001691/* Try to receive a connection preface, then upon success try to send our
1692 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1693 * missing data. It may return an error in h2c.
1694 */
1695static int h2c_frt_recv_preface(struct h2c *h2c)
1696{
1697 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001698 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001699
Willy Tarreau7838a792019-08-12 18:42:03 +02001700 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1701
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001702 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001703
1704 if (unlikely(ret1 <= 0)) {
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02001705 if (!ret1)
1706 h2c->flags |= H2_CF_DEM_SHORT_READ;
Amaury Denoyellea8879232020-10-27 17:16:03 +01001707 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn)) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01001708 TRACE_ERROR("I/O error or short read", H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02001709 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc23d6d12021-06-17 08:08:48 +02001710 if (b_data(&h2c->dbuf) ||
1711 !(((const struct session *)h2c->conn->owner)->fe->options & PR_O_IGNORE_PRB))
1712 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Amaury Denoyellea8879232020-10-27 17:16:03 +01001713 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001714 ret2 = 0;
1715 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001716 }
1717
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001718 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001719 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001720 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001721 out:
1722 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001723 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001724}
1725
Willy Tarreau01b44822018-10-03 14:26:37 +02001726/* Try to send a connection preface, then upon success try to send our
1727 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1728 * missing data. It may return an error in h2c.
1729 */
1730static int h2c_bck_send_preface(struct h2c *h2c)
1731{
1732 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001733 int ret = 0;
1734
1735 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001736
1737 if (h2c_mux_busy(h2c, NULL)) {
1738 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001739 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001740 }
1741
Willy Tarreaubcc45952019-05-26 10:05:50 +02001742 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001743 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001744 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001745 h2c->flags |= H2_CF_MUX_MALLOC;
1746 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001747 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001748 }
1749
1750 if (!b_data(res)) {
1751 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001752 ret = b_istput(res, ist(H2_CONN_PREFACE));
1753 if (unlikely(ret <= 0)) {
1754 if (!ret) {
1755 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1756 goto retry;
1757 h2c->flags |= H2_CF_MUX_MFULL;
1758 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001759 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001760 }
1761 else {
1762 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001763 ret = 0;
1764 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001765 }
1766 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001767 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001768 ret = h2c_send_settings(h2c);
1769 out:
1770 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1771 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001772}
1773
Willy Tarreau081d4722017-05-16 21:51:05 +02001774/* try to send a GOAWAY frame on the connection to report an error or a graceful
1775 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1776 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1777 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1778 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1779 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1780 * on unrecoverable failure. It will not attempt to send one again in this last
1781 * case so that it is safe to use h2c_error() to report such errors.
1782 */
1783static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1784{
1785 struct buffer *res;
1786 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001787 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001788
Willy Tarreau7838a792019-08-12 18:42:03 +02001789 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1790
1791 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1792 ret = 1; // claim that it worked
1793 goto out;
1794 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001795
1796 if (h2c_mux_busy(h2c, h2s)) {
1797 if (h2s)
1798 h2s->flags |= H2_SF_BLK_MBUSY;
1799 else
1800 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001801 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001802 }
1803
Willy Tarreau9c218e72019-05-26 10:08:28 +02001804 /* len: 8, type: 7, flags: none, sid: 0 */
1805 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1806
1807 if (h2c->last_sid < 0)
1808 h2c->last_sid = h2c->max_id;
1809
1810 write_n32(str + 9, h2c->last_sid);
1811 write_n32(str + 13, h2c->errcode);
1812
Willy Tarreaubcc45952019-05-26 10:05:50 +02001813 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001814 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001815 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001816 h2c->flags |= H2_CF_MUX_MALLOC;
1817 if (h2s)
1818 h2s->flags |= H2_SF_BLK_MROOM;
1819 else
1820 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001821 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001822 }
1823
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001824 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001825 if (unlikely(ret <= 0)) {
1826 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001827 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1828 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001829 h2c->flags |= H2_CF_MUX_MFULL;
1830 if (h2s)
1831 h2s->flags |= H2_SF_BLK_MROOM;
1832 else
1833 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001834 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001835 }
1836 else {
1837 /* we cannot report this error using GOAWAY, so we mark
1838 * it and claim a success.
1839 */
1840 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1841 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001842 ret = 1;
1843 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001844 }
1845 }
1846 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreauf965b2a2020-12-01 10:47:18 +01001847
1848 /* some codes are not for real errors, just attempts to close cleanly */
1849 switch (h2c->errcode) {
1850 case H2_ERR_NO_ERROR:
1851 case H2_ERR_ENHANCE_YOUR_CALM:
1852 case H2_ERR_REFUSED_STREAM:
1853 case H2_ERR_CANCEL:
1854 break;
1855 default:
Willy Tarreau4781b152021-04-06 13:53:36 +02001856 HA_ATOMIC_INC(&h2c->px_counters->goaway_resp);
Willy Tarreauf965b2a2020-12-01 10:47:18 +01001857 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001858 out:
1859 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001860 return ret;
1861}
1862
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001863/* Try to send an RST_STREAM frame on the connection for the indicated stream
1864 * during mux operations. This stream must be valid and cannot be closed
1865 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1866 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1867 * not yet.
1868 *
1869 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1870 * to write the message, it subscribes the stream to future notifications.
1871 */
1872static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1873{
1874 struct buffer *res;
1875 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001876 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001877
Willy Tarreau7838a792019-08-12 18:42:03 +02001878 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1879
1880 if (!h2s || h2s->st == H2_SS_CLOSED) {
1881 ret = 1;
1882 goto out;
1883 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001884
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001885 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1886 * RST_STREAM in response to a RST_STREAM frame.
1887 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001888 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001889 ret = 1;
1890 goto ignore;
1891 }
1892
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001893 if (h2c_mux_busy(h2c, h2s)) {
1894 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001895 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001896 }
1897
Willy Tarreau9c218e72019-05-26 10:08:28 +02001898 /* len: 4, type: 3, flags: none */
1899 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1900 write_n32(str + 5, h2s->id);
1901 write_n32(str + 9, h2s->errcode);
1902
Willy Tarreaubcc45952019-05-26 10:05:50 +02001903 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001904 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001905 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001906 h2c->flags |= H2_CF_MUX_MALLOC;
1907 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001908 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001909 }
1910
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001911 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001912 if (unlikely(ret <= 0)) {
1913 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001914 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1915 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001916 h2c->flags |= H2_CF_MUX_MFULL;
1917 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001918 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001919 }
1920 else {
1921 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001922 ret = 0;
1923 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001924 }
1925 }
1926
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001927 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001928 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001929 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001930 out:
1931 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001932 return ret;
1933}
1934
1935/* Try to send an RST_STREAM frame on the connection for the stream being
1936 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001937 * error code, even if the stream is one of the dummy ones, and will update
1938 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001939 *
1940 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1941 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001942 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001943 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001944 */
1945static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1946{
1947 struct buffer *res;
1948 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001949 int ret = 0;
1950
1951 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001952
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001953 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1954 * RST_STREAM in response to a RST_STREAM frame.
1955 */
1956 if (h2c->dft == H2_FT_RST_STREAM) {
1957 ret = 1;
1958 goto ignore;
1959 }
1960
Willy Tarreau27a84c92017-10-17 08:10:17 +02001961 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001962 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001963 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001964 }
1965
Willy Tarreau9c218e72019-05-26 10:08:28 +02001966 /* len: 4, type: 3, flags: none */
1967 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1968
1969 write_n32(str + 5, h2c->dsi);
1970 write_n32(str + 9, h2s->errcode);
1971
Willy Tarreaubcc45952019-05-26 10:05:50 +02001972 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001973 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001974 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001975 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001976 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001977 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001978 }
1979
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001980 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001981 if (unlikely(ret <= 0)) {
1982 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001983 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1984 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001985 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001986 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001987 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001988 }
1989 else {
1990 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001991 ret = 0;
1992 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001993 }
1994 }
1995
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001996 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001997 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001998 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001999 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01002000 }
2001
Willy Tarreau7838a792019-08-12 18:42:03 +02002002 out:
Willy Tarreau4781b152021-04-06 13:53:36 +02002003 HA_ATOMIC_INC(&h2c->px_counters->rst_stream_resp);
Willy Tarreau7838a792019-08-12 18:42:03 +02002004 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02002005 return ret;
2006}
2007
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002008/* try to send an empty DATA frame with the ES flag set to notify about the
2009 * end of stream and match a shutdown(write). If an ES was already sent as
2010 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
2011 * on success or zero if nothing was done. In case of lack of room to write the
2012 * message, it subscribes the requesting stream to future notifications.
2013 */
2014static int h2_send_empty_data_es(struct h2s *h2s)
2015{
2016 struct h2c *h2c = h2s->h2c;
2017 struct buffer *res;
2018 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002019 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002020
Willy Tarreau7838a792019-08-12 18:42:03 +02002021 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
2022
2023 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
2024 ret = 1;
2025 goto out;
2026 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002027
2028 if (h2c_mux_busy(h2c, h2s)) {
2029 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002030 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002031 }
2032
Willy Tarreau9c218e72019-05-26 10:08:28 +02002033 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
2034 memcpy(str, "\x00\x00\x00\x00\x01", 5);
2035 write_n32(str + 5, h2s->id);
2036
Willy Tarreaubcc45952019-05-26 10:05:50 +02002037 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002038 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002039 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002040 h2c->flags |= H2_CF_MUX_MALLOC;
2041 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002042 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002043 }
2044
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002045 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002046 if (likely(ret > 0)) {
2047 h2s->flags |= H2_SF_ES_SENT;
2048 }
2049 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002050 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2051 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002052 h2c->flags |= H2_CF_MUX_MFULL;
2053 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002054 }
2055 else {
2056 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002057 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002058 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002059 out:
2060 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002061 return ret;
2062}
2063
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002064/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002065 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002066 * is automatically updated accordingly. If the stream is orphaned, it is
2067 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01002068 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002069static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01002070{
Willy Tarreau7838a792019-08-12 18:42:03 +02002071 struct h2c *h2c = h2s->h2c;
2072
2073 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
2074
Christopher Fauletf02ca002019-03-07 16:21:34 +01002075 if (!h2s->cs) {
2076 /* this stream was already orphaned */
2077 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002078 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002079 return;
2080 }
2081
Christopher Fauletaade4ed2020-10-08 15:38:41 +02002082 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002083 if (h2s->st == H2_SS_OPEN)
2084 h2s->st = H2_SS_HREM;
2085 else if (h2s->st == H2_SS_HLOC)
2086 h2s_close(h2s);
2087 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002088
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002089 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
2090 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
2091 h2s->cs->flags |= CS_FL_ERR_PENDING;
2092 if (h2s->cs->flags & CS_FL_EOS)
2093 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02002094
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002095 if (h2s->st < H2_SS_ERROR)
2096 h2s->st = H2_SS_ERROR;
2097 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01002098
2099 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002100 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002101}
2102
2103/* wake the streams attached to the connection, whose id is greater than <last>
2104 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002105 */
Willy Tarreau23482912019-05-07 15:23:14 +02002106static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002107{
2108 struct eb32_node *node;
2109 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002110
Willy Tarreau7838a792019-08-12 18:42:03 +02002111 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
2112
Christopher Fauletf02ca002019-03-07 16:21:34 +01002113 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002114 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
2115 while (node) {
2116 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002117 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002118 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002119 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01002120
Christopher Fauletf02ca002019-03-07 16:21:34 +01002121 /* Wake all streams with unassigned ID (ID == 0) */
2122 node = eb32_lookup(&h2c->streams_by_id, 0);
2123 while (node) {
2124 h2s = container_of(node, struct h2s, by_id);
2125 if (h2s->id > 0)
2126 break;
2127 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002128 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002129 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002130
2131 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002132}
2133
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002134/* Wake up all blocked streams whose window size has become positive after the
2135 * mux's initial window was adjusted. This should be done after having processed
2136 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002137 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002138static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02002139{
2140 struct h2s *h2s;
2141 struct eb32_node *node;
2142
Willy Tarreau7838a792019-08-12 18:42:03 +02002143 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2144
Willy Tarreau3421aba2017-07-27 15:41:03 +02002145 node = eb32_first(&h2c->streams_by_id);
2146 while (node) {
2147 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002148 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002149 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002150 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002151 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2152 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreau2b718102021-04-21 07:32:39 +02002153 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002154 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002155 node = eb32_next(node);
2156 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002157
2158 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002159}
2160
2161/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
2162 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01002163 * return an error in h2c. The caller must have already verified frame length
2164 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002165 */
2166static int h2c_handle_settings(struct h2c *h2c)
2167{
2168 unsigned int offset;
2169 int error;
2170
Willy Tarreau7838a792019-08-12 18:42:03 +02002171 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2172
Willy Tarreau3421aba2017-07-27 15:41:03 +02002173 if (h2c->dff & H2_F_SETTINGS_ACK) {
2174 if (h2c->dfl) {
2175 error = H2_ERR_FRAME_SIZE_ERROR;
2176 goto fail;
2177 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002178 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002179 }
2180
Willy Tarreau3421aba2017-07-27 15:41:03 +02002181 /* process full frame only */
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002182 if (b_data(&h2c->dbuf) < h2c->dfl) {
2183 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002184 goto out0;
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002185 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002186
2187 /* parse the frame */
2188 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002189 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2190 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002191
2192 switch (type) {
2193 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2194 /* we need to update all existing streams with the
2195 * difference from the previous iws.
2196 */
2197 if (arg < 0) { // RFC7540#6.5.2
2198 error = H2_ERR_FLOW_CONTROL_ERROR;
2199 goto fail;
2200 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002201 h2c->miw = arg;
2202 break;
2203 case H2_SETTINGS_MAX_FRAME_SIZE:
2204 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002205 TRACE_ERROR("MAX_FRAME_SIZE out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002206 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002207 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002208 goto fail;
2209 }
2210 h2c->mfs = arg;
2211 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002212 case H2_SETTINGS_ENABLE_PUSH:
2213 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002214 TRACE_ERROR("ENABLE_PUSH out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002215 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002216 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002217 goto fail;
2218 }
2219 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002220 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2221 if (h2c->flags & H2_CF_IS_BACK) {
2222 /* the limit is only for the backend; for the frontend it is our limit */
2223 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2224 arg = h2_settings_max_concurrent_streams;
2225 h2c->streams_limit = arg;
2226 }
2227 break;
Amaury Denoyellef9dcbee2020-12-11 17:53:10 +01002228 case H2_SETTINGS_ENABLE_CONNECT_PROTOCOL:
2229 /* nothing to do here as this settings is automatically
2230 * transmits to the client */
2231 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002232 }
2233 }
2234
2235 /* need to ACK this frame now */
2236 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002237 done:
2238 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002239 return 1;
2240 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002241 if (!(h2c->flags & H2_CF_IS_BACK))
2242 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002243 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002244 out0:
2245 TRACE_DEVEL("leaving with missing data or error", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002246 return 0;
2247}
2248
2249/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2250 * success or one of the h2_status values.
2251 */
2252static int h2c_ack_settings(struct h2c *h2c)
2253{
2254 struct buffer *res;
2255 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002256 int ret = 0;
2257
2258 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002259
2260 if (h2c_mux_busy(h2c, NULL)) {
2261 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002262 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002263 }
2264
Willy Tarreau9c218e72019-05-26 10:08:28 +02002265 memcpy(str,
2266 "\x00\x00\x00" /* length : 0 (no data) */
2267 "\x04" "\x01" /* type : 4, flags : ACK */
2268 "\x00\x00\x00\x00" /* stream ID */, 9);
2269
Willy Tarreaubcc45952019-05-26 10:05:50 +02002270 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002271 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002272 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002273 h2c->flags |= H2_CF_MUX_MALLOC;
2274 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002275 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002276 }
2277
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002278 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002279 if (unlikely(ret <= 0)) {
2280 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002281 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2282 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002283 h2c->flags |= H2_CF_MUX_MFULL;
2284 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002285 }
2286 else {
2287 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002288 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002289 }
2290 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002291 out:
2292 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002293 return ret;
2294}
2295
Willy Tarreaucf68c782017-10-10 17:11:41 +02002296/* processes a PING frame and schedules an ACK if needed. The caller must pass
2297 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002298 * missing data. The caller must have already verified frame length
2299 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002300 */
2301static int h2c_handle_ping(struct h2c *h2c)
2302{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002303 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002304 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002305 h2c->st0 = H2_CS_FRAME_A;
2306 return 1;
2307}
2308
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002309/* Try to send a window update for stream id <sid> and value <increment>.
2310 * Returns > 0 on success or zero on missing room or failure. It may return an
2311 * error in h2c.
2312 */
2313static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2314{
2315 struct buffer *res;
2316 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002317 int ret = 0;
2318
2319 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002320
2321 if (h2c_mux_busy(h2c, NULL)) {
2322 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002323 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002324 }
2325
Willy Tarreau9c218e72019-05-26 10:08:28 +02002326 /* length: 4, type: 8, flags: none */
2327 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2328 write_n32(str + 5, sid);
2329 write_n32(str + 9, increment);
2330
Willy Tarreaubcc45952019-05-26 10:05:50 +02002331 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002332 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002333 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002334 h2c->flags |= H2_CF_MUX_MALLOC;
2335 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002336 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002337 }
2338
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002339 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002340 if (unlikely(ret <= 0)) {
2341 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002342 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2343 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002344 h2c->flags |= H2_CF_MUX_MFULL;
2345 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002346 }
2347 else {
2348 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002349 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002350 }
2351 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002352 out:
2353 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002354 return ret;
2355}
2356
2357/* try to send pending window update for the connection. It's safe to call it
2358 * with no pending updates. Returns > 0 on success or zero on missing room or
2359 * failure. It may return an error in h2c.
2360 */
2361static int h2c_send_conn_wu(struct h2c *h2c)
2362{
2363 int ret = 1;
2364
Willy Tarreau7838a792019-08-12 18:42:03 +02002365 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2366
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002367 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002368 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002369
Willy Tarreau97aaa672018-12-23 09:49:04 +01002370 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2371 /* increase the advertised connection window to 2G on
2372 * first update.
2373 */
2374 h2c->flags |= H2_CF_WINDOW_OPENED;
2375 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2376 }
2377
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002378 /* send WU for the connection */
2379 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2380 if (ret > 0)
2381 h2c->rcvd_c = 0;
2382
Willy Tarreau7838a792019-08-12 18:42:03 +02002383 out:
2384 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002385 return ret;
2386}
2387
2388/* try to send pending window update for the current dmux stream. It's safe to
2389 * call it with no pending updates. Returns > 0 on success or zero on missing
2390 * room or failure. It may return an error in h2c.
2391 */
2392static int h2c_send_strm_wu(struct h2c *h2c)
2393{
2394 int ret = 1;
2395
Willy Tarreau7838a792019-08-12 18:42:03 +02002396 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2397
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002398 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002399 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002400
2401 /* send WU for the stream */
2402 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2403 if (ret > 0)
2404 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002405 out:
2406 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002407 return ret;
2408}
2409
Willy Tarreaucf68c782017-10-10 17:11:41 +02002410/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2411 * success, 0 on missing data or one of the h2_status values.
2412 */
2413static int h2c_ack_ping(struct h2c *h2c)
2414{
2415 struct buffer *res;
2416 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002417 int ret = 0;
2418
2419 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002420
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002421 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002422 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002423
2424 if (h2c_mux_busy(h2c, NULL)) {
2425 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002426 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002427 }
2428
Willy Tarreaucf68c782017-10-10 17:11:41 +02002429 memcpy(str,
2430 "\x00\x00\x08" /* length : 8 (same payload) */
2431 "\x06" "\x01" /* type : 6, flags : ACK */
2432 "\x00\x00\x00\x00" /* stream ID */, 9);
2433
2434 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002435 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002436
Willy Tarreau9c218e72019-05-26 10:08:28 +02002437 res = br_tail(h2c->mbuf);
2438 retry:
2439 if (!h2_get_buf(h2c, res)) {
2440 h2c->flags |= H2_CF_MUX_MALLOC;
2441 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002442 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002443 }
2444
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002445 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002446 if (unlikely(ret <= 0)) {
2447 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002448 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2449 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002450 h2c->flags |= H2_CF_MUX_MFULL;
2451 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002452 }
2453 else {
2454 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002455 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002456 }
2457 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002458 out:
2459 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002460 return ret;
2461}
2462
Willy Tarreau26f95952017-07-27 17:18:30 +02002463/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2464 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002465 * h2c or h2s. The caller must have already verified frame length and stream ID
2466 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002467 */
2468static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2469{
2470 int32_t inc;
2471 int error;
2472
Willy Tarreau7838a792019-08-12 18:42:03 +02002473 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2474
Willy Tarreau26f95952017-07-27 17:18:30 +02002475 /* process full frame only */
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002476 if (b_data(&h2c->dbuf) < h2c->dfl) {
2477 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002478 goto out0;
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002479 }
Willy Tarreau26f95952017-07-27 17:18:30 +02002480
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002481 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002482
2483 if (h2c->dsi != 0) {
2484 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002485
2486 /* it's not an error to receive WU on a closed stream */
2487 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002488 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002489
2490 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002491 TRACE_ERROR("stream WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s);
Willy Tarreau26f95952017-07-27 17:18:30 +02002492 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002493 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002494 goto strm_err;
2495 }
2496
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002497 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002498 TRACE_ERROR("stream WINDOW_UPDATE inc<0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s);
Willy Tarreau26f95952017-07-27 17:18:30 +02002499 error = H2_ERR_FLOW_CONTROL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002500 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002501 goto strm_err;
2502 }
2503
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002504 h2s->sws += inc;
2505 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002506 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002507 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002508 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2509 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreau2b718102021-04-21 07:32:39 +02002510 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002511 }
2512 }
2513 else {
2514 /* connection window update */
2515 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002516 TRACE_ERROR("conn WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002517 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002518 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002519 goto conn_err;
2520 }
2521
2522 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2523 error = H2_ERR_FLOW_CONTROL_ERROR;
2524 goto conn_err;
2525 }
2526
2527 h2c->mws += inc;
2528 }
2529
Willy Tarreau7838a792019-08-12 18:42:03 +02002530 done:
2531 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002532 return 1;
2533
2534 conn_err:
2535 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002536 out0:
2537 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002538 return 0;
2539
2540 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002541 h2s_error(h2s, error);
2542 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002543 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002544 return 0;
2545}
2546
Willy Tarreaue96b0922017-10-30 00:28:29 +01002547/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002548 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2549 * have already verified frame length and stream ID validity. Described in
2550 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002551 */
2552static int h2c_handle_goaway(struct h2c *h2c)
2553{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002554 int last;
2555
Willy Tarreau7838a792019-08-12 18:42:03 +02002556 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002557 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002558 if (b_data(&h2c->dbuf) < h2c->dfl) {
2559 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002560 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002561 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002562 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002563
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002564 last = h2_get_n32(&h2c->dbuf, 0);
2565 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002566 if (h2c->last_sid < 0)
2567 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002568 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002569 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002570 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002571}
2572
Willy Tarreau92153fc2017-12-03 19:46:19 +01002573/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002574 * invalid. Returns > 0 on success or zero on missing data. It may return an
2575 * error in h2c. The caller must have already verified frame length and stream
2576 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002577 */
2578static int h2c_handle_priority(struct h2c *h2c)
2579{
Willy Tarreau7838a792019-08-12 18:42:03 +02002580 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2581
Willy Tarreau92153fc2017-12-03 19:46:19 +01002582 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002583 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002584 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002585 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002586 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002587 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002588
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002589 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002590 /* 7540#5.3 : can't depend on itself */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002591 TRACE_ERROR("PRIORITY depends on itself", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002592 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02002593 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002594 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002595 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002596 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002597 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002598 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002599}
2600
Willy Tarreaucd234e92017-08-18 10:59:39 +02002601/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002602 * Returns > 0 on success or zero on missing data. The caller must have already
2603 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002604 */
2605static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2606{
Willy Tarreau7838a792019-08-12 18:42:03 +02002607 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2608
Willy Tarreaucd234e92017-08-18 10:59:39 +02002609 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002610 if (b_data(&h2c->dbuf) < h2c->dfl) {
2611 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002612 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002613 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002614 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002615
2616 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002617 if (h2s->st == H2_SS_CLOSED) {
2618 TRACE_DEVEL("leaving on stream closed", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002619 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002620 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002621
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002622 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002623 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002624
2625 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002626 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002627 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002628 }
2629
2630 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002631 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002632 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002633}
2634
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002635/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2636 * It may return an error in h2c or h2s. The caller must consider that the
2637 * return value is the new h2s in case one was allocated (most common case).
2638 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002639 * errors here are reported as connection errors since it's impossible to
2640 * recover from such errors after the compression context has been altered.
2641 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002642static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002643{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002644 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002645 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002646 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002647 int error;
2648
Willy Tarreau7838a792019-08-12 18:42:03 +02002649 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2650
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002651 if (!b_size(&h2c->dbuf)) {
2652 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002653 goto out; // empty buffer
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002654 }
Willy Tarreau13278b42017-10-13 19:23:14 +02002655
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002656 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) {
2657 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002658 goto out; // incomplete frame
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002659 }
Willy Tarreau13278b42017-10-13 19:23:14 +02002660
2661 /* now either the frame is complete or the buffer is complete */
2662 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002663 /* The stream exists/existed, this must be a trailers frame */
2664 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002665 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len, NULL);
Willy Tarreauaab1a602019-05-06 11:12:18 +02002666 /* unrecoverable error ? */
2667 if (h2c->st0 >= H2_CS_ERROR)
2668 goto out;
2669
Christopher Faulet0de3f552021-10-08 08:56:00 +02002670 if (error == 0) {
2671 /* Demux not blocked because of the stream, it is an incomplete frame */
2672 if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY))
2673 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002674 goto out; // missing data
Christopher Faulet0de3f552021-10-08 08:56:00 +02002675 }
Willy Tarreauaab1a602019-05-06 11:12:18 +02002676
2677 if (error < 0) {
2678 /* Failed to decode this frame (e.g. too large request)
2679 * but the HPACK decompressor is still synchronized.
2680 */
2681 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2682 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002683 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002684 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002685 goto done;
2686 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002687 /* the connection was already killed by an RST, let's consume
2688 * the data and send another RST.
2689 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002690 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau1f035502019-01-30 11:44:07 +01002691 h2s = (struct h2s*)h2_error_stream;
2692 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002693 }
2694 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2695 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2696 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002697 TRACE_ERROR("HEADERS on invalid stream ID", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau4781b152021-04-06 13:53:36 +02002698 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002699 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002700 goto conn_err;
2701 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002702 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2703 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002704
Amaury Denoyelle74162742020-12-11 17:53:05 +01002705 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002706
Willy Tarreau25919232019-01-03 14:48:18 +01002707 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002708 if (h2c->st0 >= H2_CS_ERROR)
2709 goto out;
2710
Willy Tarreau25919232019-01-03 14:48:18 +01002711 if (error <= 0) {
Christopher Faulet0de3f552021-10-08 08:56:00 +02002712 if (error == 0) {
2713 /* Demux not blocked because of the stream, it is an incomplete frame */
2714 if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY))
2715 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau25919232019-01-03 14:48:18 +01002716 goto out; // missing data
Christopher Faulet0de3f552021-10-08 08:56:00 +02002717 }
Willy Tarreau25919232019-01-03 14:48:18 +01002718
2719 /* Failed to decode this stream (e.g. too large request)
2720 * but the HPACK decompressor is still synchronized.
2721 */
2722 h2s = (struct h2s*)h2_error_stream;
2723 goto send_rst;
2724 }
2725
Willy Tarreau3c10d512021-06-17 08:29:14 +02002726 TRACE_USER("rcvd H2 request ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW, h2c->conn, 0, &rxbuf);
2727
Willy Tarreau22de8d32018-09-05 19:55:58 +02002728 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002729 * positively from h2c_frt_stream_new(), the stream will report the error,
2730 * and if we return in error, h2c_frt_stream_new() will emit the error.
Christopher Faulet7d013e72020-12-15 16:56:50 +01002731 *
2732 * Xfer the rxbuf to the stream. On success, the new stream owns the
2733 * rxbuf. On error, it is released here.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002734 */
Christopher Faulet7d013e72020-12-15 16:56:50 +01002735 h2s = h2c_frt_stream_new(h2c, h2c->dsi, &rxbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02002736 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002737 h2s = (struct h2s*)h2_refused_stream;
2738 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002739 }
2740
2741 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002742 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002743 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002744
Willy Tarreau88d138e2019-01-02 19:38:14 +01002745 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002746 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002747 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002748
2749 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002750 if (h2s->st == H2_SS_OPEN)
2751 h2s->st = H2_SS_HREM;
2752 else
2753 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002754 }
2755
Willy Tarreau3a429f02019-01-03 11:41:50 +01002756 /* update the max stream ID if the request is being processed */
2757 if (h2s->id > h2c->max_id)
2758 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002759
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002760 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002761
2762 conn_err:
2763 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002764 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002765
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002766 out:
2767 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002768 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002769 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002770
2771 send_rst:
2772 /* make the demux send an RST for the current stream. We may only
2773 * do this if we're certain that the HEADERS frame was properly
2774 * decompressed so that the HPACK decoder is still kept up to date.
2775 */
2776 h2_release_buf(h2c, &rxbuf);
2777 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002778
Willy Tarreau022e5e52020-09-10 09:33:15 +02002779 TRACE_USER("rejected H2 request", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002780 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002781 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002782}
2783
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002784/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2785 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2786 * errors here are reported as connection errors since it's impossible to
2787 * recover from such errors after the compression context has been altered.
2788 */
2789static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2790{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002791 struct buffer rxbuf = BUF_NULL;
2792 unsigned long long body_len = 0;
2793 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002794 int error;
2795
Willy Tarreau7838a792019-08-12 18:42:03 +02002796 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2797
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002798 if (!b_size(&h2c->dbuf)) {
2799 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002800 goto fail; // empty buffer
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002801 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002802
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002803 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) {
2804 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002805 goto fail; // incomplete frame
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002806 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002807
Christopher Faulet6884aa32019-09-23 15:28:20 +02002808 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002809 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len, h2s->upgrade_protocol);
Christopher Faulet6884aa32019-09-23 15:28:20 +02002810 }
2811 else {
2812 /* the connection was already killed by an RST, let's consume
2813 * the data and send another RST.
2814 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002815 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002816 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002817 h2c->st0 = H2_CS_FRAME_E;
2818 goto send_rst;
2819 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002820
Willy Tarreau25919232019-01-03 14:48:18 +01002821 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002822 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002823 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002824
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002825 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2826 /* RFC7540#5.1 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002827 TRACE_ERROR("response HEADERS in invalid state", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002828 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2829 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau4781b152021-04-06 13:53:36 +02002830 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002831 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002832 }
2833
Willy Tarreau25919232019-01-03 14:48:18 +01002834 if (error <= 0) {
Christopher Faulet0de3f552021-10-08 08:56:00 +02002835 if (error == 0) {
2836 /* Demux not blocked because of the stream, it is an incomplete frame */
2837 if (!(h2c->flags &H2_CF_DEM_BLOCK_ANY))
2838 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002839 goto fail; // missing data
Christopher Faulet0de3f552021-10-08 08:56:00 +02002840 }
Willy Tarreau25919232019-01-03 14:48:18 +01002841
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002842 /* stream error : send RST_STREAM */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002843 TRACE_ERROR("couldn't decode response HEADERS", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau25919232019-01-03 14:48:18 +01002844 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002845 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau4781b152021-04-06 13:53:36 +02002846 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002847 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002848 }
2849
Christopher Fauletfa922f02019-05-07 10:55:17 +02002850 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002851 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002852
Willy Tarreau927b88b2019-03-04 08:03:25 +01002853 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002854 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002855 else if (h2s->flags & H2_SF_ES_RCVD) {
2856 if (h2s->st == H2_SS_OPEN)
2857 h2s->st = H2_SS_HREM;
2858 else if (h2s->st == H2_SS_HLOC)
2859 h2s_close(h2s);
2860 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002861
Christopher Fauletf95f8762021-01-22 11:59:07 +01002862 /* Unblock busy server h2s waiting for the response headers to validate
2863 * the tunnel establishment or the end of the response of an oborted
2864 * tunnel
2865 */
2866 if ((h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY)) == (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY) ||
2867 (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) {
2868 TRACE_STATE("Unblock h2s blocked on tunnel establishment/abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2869 h2s->flags &= ~H2_SF_BLK_MBUSY;
2870 }
2871
Willy Tarreaucbd37e02021-06-16 18:32:42 +02002872 TRACE_USER("rcvd H2 response ", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, 0, &h2s->rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002873 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002874 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002875 fail:
2876 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2877 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002878
2879 send_rst:
2880 /* make the demux send an RST for the current stream. We may only
2881 * do this if we're certain that the HEADERS frame was properly
2882 * decompressed so that the HPACK decoder is still kept up to date.
2883 */
2884 h2_release_buf(h2c, &rxbuf);
2885 h2c->st0 = H2_CS_FRAME_E;
2886
Willy Tarreau022e5e52020-09-10 09:33:15 +02002887 TRACE_USER("rejected H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf);
Christopher Faulet6884aa32019-09-23 15:28:20 +02002888 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2889 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002890}
2891
Willy Tarreau454f9052017-10-26 19:40:35 +02002892/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2893 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2894 */
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01002895static int h2c_handle_data(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02002896{
2897 int error;
2898
Willy Tarreau7838a792019-08-12 18:42:03 +02002899 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2900
Willy Tarreau454f9052017-10-26 19:40:35 +02002901 /* note that empty DATA frames are perfectly valid and sometimes used
2902 * to signal an end of stream (with the ES flag).
2903 */
2904
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002905 if (!b_size(&h2c->dbuf) && h2c->dfl) {
2906 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002907 goto fail; // empty buffer
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002908 }
Willy Tarreau454f9052017-10-26 19:40:35 +02002909
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002910 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf)) {
2911 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7838a792019-08-12 18:42:03 +02002912 goto fail; // incomplete frame
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02002913 }
Willy Tarreau454f9052017-10-26 19:40:35 +02002914
2915 /* now either the frame is complete or the buffer is complete */
2916
Willy Tarreau454f9052017-10-26 19:40:35 +02002917 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2918 /* RFC7540#6.1 */
2919 error = H2_ERR_STREAM_CLOSED;
2920 goto strm_err;
2921 }
2922
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002923 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002924 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002925 TRACE_ERROR("DATA frame larger than content-length", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002926 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002927 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002928 goto strm_err;
2929 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01002930 if (!(h2c->flags & H2_CF_IS_BACK) &&
2931 (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT) &&
2932 ((h2c->dfl - h2c->dpl) || !(h2c->dff & H2_F_DATA_END_STREAM))) {
2933 /* a tunnel attempt was aborted but the client still try to send some raw data.
2934 * Thus the stream is closed with the CANCEL error. Here we take care it is not
2935 * an empty DATA Frame with the ES flag. The error is only handled if ES was
2936 * already sent to the client because depending on the scheduling, these data may
Ilya Shipitsinacf84592021-02-06 22:29:08 +05002937 * have been sent before the server response but not handle here.
Christopher Faulet91b21dc2021-01-22 12:13:15 +01002938 */
2939 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2940 error = H2_ERR_CANCEL;
2941 goto strm_err;
2942 }
Willy Tarreau1915ca22019-01-24 11:49:37 +01002943
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002944 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002945 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002946
Willy Tarreau454f9052017-10-26 19:40:35 +02002947 /* call the upper layers to process the frame, then let the upper layer
2948 * notify the stream about any change.
2949 */
2950 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002951 /* The upper layer has already closed, this may happen on
2952 * 4xx/redirects during POST, or when receiving a response
2953 * from an H2 server after the client has aborted.
2954 */
2955 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002956 goto strm_err;
2957 }
2958
Willy Tarreau8f650c32017-11-21 19:36:21 +01002959 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002960 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002961
Willy Tarreau721c9742017-11-07 11:05:42 +01002962 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002963 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002964 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002965 }
2966
2967 /* check for completion : the callee will change this to FRAME_A or
2968 * FRAME_H once done.
2969 */
2970 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002971 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002972
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002973 /* last frame */
2974 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002975 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002976 if (h2s->st == H2_SS_OPEN)
2977 h2s->st = H2_SS_HREM;
2978 else
2979 h2s_close(h2s);
2980
Willy Tarreau1915ca22019-01-24 11:49:37 +01002981 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2982 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002983 TRACE_ERROR("ES on DATA frame before content-length", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002984 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002985 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002986 goto strm_err;
2987 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002988 }
2989
Christopher Fauletf95f8762021-01-22 11:59:07 +01002990 /* Unblock busy server h2s waiting for the end of the response for an
2991 * aborted tunnel
2992 */
2993 if ((h2c->flags & H2_CF_IS_BACK) &&
2994 (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_RCVD|H2_SF_BLK_MBUSY)) {
2995 TRACE_STATE("Unblock h2s blocked on tunnel abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2996 h2s->flags &= ~H2_SF_BLK_MBUSY;
2997 }
2998
Willy Tarreau7838a792019-08-12 18:42:03 +02002999 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003000 return 1;
3001
Willy Tarreau454f9052017-10-26 19:40:35 +02003002 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01003003 h2s_error(h2s, error);
3004 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003005 fail:
3006 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003007 return 0;
3008}
3009
Willy Tarreau63864812019-08-07 14:25:20 +02003010/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
3011 * valid for the current stream state. This is needed only after parsing the
3012 * frame header but in practice it can be performed at any time during
3013 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
3014 * or 0 in case of error, in which case either h2s or h2c will carry an error.
3015 */
3016static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
3017{
Willy Tarreau7838a792019-08-12 18:42:03 +02003018 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
3019
Willy Tarreau63864812019-08-07 14:25:20 +02003020 if (h2s->st == H2_SS_IDLE &&
3021 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
3022 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
3023 * this state MUST be treated as a connection error
3024 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003025 TRACE_ERROR("invalid frame type for IDLE state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003026 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003027 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02003028 /* only log if no other stream can report the error */
3029 sess_log(h2c->conn->owner);
3030 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003031 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02003032 TRACE_DEVEL("leaving in error (idle&!hdrs&!prio)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003033 return 0;
3034 }
3035
Willy Tarreau57a18162019-11-24 14:57:53 +01003036 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
3037 /* only PUSH_PROMISE would be permitted here */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003038 TRACE_ERROR("invalid frame type for IDLE state (back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau57a18162019-11-24 14:57:53 +01003039 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02003040 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau57a18162019-11-24 14:57:53 +01003041 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
3042 return 0;
3043 }
3044
Willy Tarreau63864812019-08-07 14:25:20 +02003045 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
3046 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
3047 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
3048 * this state MUST be treated as a stream error.
3049 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
3050 * PUSH_PROMISE/CONTINUATION cause connection errors.
3051 */
Amaury Denoyellea8879232020-10-27 17:16:03 +01003052 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003053 TRACE_ERROR("invalid frame type for HREM state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003054 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02003055 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003056 }
3057 else {
Willy Tarreau63864812019-08-07 14:25:20 +02003058 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003059 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003060 TRACE_DEVEL("leaving in error (hrem&!wu&!rst&!prio)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003061 return 0;
3062 }
3063
3064 /* Below the management of frames received in closed state is a
3065 * bit hackish because the spec makes strong differences between
3066 * streams closed by receiving RST, sending RST, and seeing ES
3067 * in both directions. In addition to this, the creation of a
3068 * new stream reusing the identifier of a closed one will be
3069 * detected here. Given that we cannot keep track of all closed
3070 * streams forever, we consider that unknown closed streams were
3071 * closed on RST received, which allows us to respond with an
3072 * RST without breaking the connection (eg: to abort a transfer).
3073 * Some frames have to be silently ignored as well.
3074 */
3075 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
3076 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
3077 /* #5.1.1: The identifier of a newly
3078 * established stream MUST be numerically
3079 * greater than all streams that the initiating
3080 * endpoint has opened or reserved. This
3081 * governs streams that are opened using a
3082 * HEADERS frame and streams that are reserved
3083 * using PUSH_PROMISE. An endpoint that
3084 * receives an unexpected stream identifier
3085 * MUST respond with a connection error.
3086 */
3087 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003088 TRACE_DEVEL("leaving in error (closed&hdrmask)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003089 return 0;
3090 }
3091
Willy Tarreau4c08f122019-09-26 08:47:15 +02003092 if (h2s->flags & H2_SF_RST_RCVD &&
3093 !(h2_ft_bit(h2c->dft) & (H2_FT_HDR_MASK | H2_FT_RST_STREAM_BIT | H2_FT_PRIORITY_BIT | H2_FT_WINDOW_UPDATE_BIT))) {
Willy Tarreau63864812019-08-07 14:25:20 +02003094 /* RFC7540#5.1:closed: an endpoint that
3095 * receives any frame other than PRIORITY after
3096 * receiving a RST_STREAM MUST treat that as a
3097 * stream error of type STREAM_CLOSED.
3098 *
3099 * Note that old streams fall into this category
3100 * and will lead to an RST being sent.
3101 *
3102 * However, we cannot generalize this to all frame types. Those
3103 * carrying compression state must still be processed before
3104 * being dropped or we'll desynchronize the decoder. This can
3105 * happen with request trailers received after sending an
3106 * RST_STREAM, or with header/trailers responses received after
3107 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02003108 *
3109 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003110 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02003111 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02003112 */
3113 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
3114 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02003115 TRACE_DEVEL("leaving in error (rst_rcvd&!hdrmask)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003116 return 0;
3117 }
3118
3119 /* RFC7540#5.1:closed: if this state is reached as a
3120 * result of sending a RST_STREAM frame, the peer that
3121 * receives the RST_STREAM might have already sent
3122 * frames on the stream that cannot be withdrawn. An
3123 * endpoint MUST ignore frames that it receives on
3124 * closed streams after it has sent a RST_STREAM
3125 * frame. An endpoint MAY choose to limit the period
3126 * over which it ignores frames and treat frames that
3127 * arrive after this time as being in error.
3128 */
3129 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
3130 /* RFC7540#5.1:closed: any frame other than
3131 * PRIO/WU/RST in this state MUST be treated as
3132 * a connection error
3133 */
3134 if (h2c->dft != H2_FT_RST_STREAM &&
3135 h2c->dft != H2_FT_PRIORITY &&
3136 h2c->dft != H2_FT_WINDOW_UPDATE) {
3137 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003138 TRACE_DEVEL("leaving in error (rst_sent&!rst&!prio&!wu)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003139 return 0;
3140 }
3141 }
3142 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003143 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003144 return 1;
3145}
3146
Willy Tarreaubc933932017-10-09 16:21:43 +02003147/* process Rx frames to be demultiplexed */
3148static void h2_process_demux(struct h2c *h2c)
3149{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003150 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003151 struct h2_fh hdr;
3152 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003153 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02003154
Willy Tarreau7838a792019-08-12 18:42:03 +02003155 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3156
Willy Tarreau081d4722017-05-16 21:51:05 +02003157 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02003158 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02003159
3160 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3161 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003162 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02003163 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02003164 goto out;
3165
Willy Tarreau52eed752017-09-22 15:05:09 +02003166 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
3167 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003168 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003169 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003170 h2c->st0 = H2_CS_ERROR2;
Willy Tarreauc23d6d12021-06-17 08:08:48 +02003171 if (b_data(&h2c->dbuf) ||
Christopher Faulet79b347d2021-07-26 10:18:35 +02003172 !(((const struct session *)h2c->conn->owner)->fe->options & (PR_O_NULLNOLOG|PR_O_IGNORE_PRB)))
Willy Tarreauc23d6d12021-06-17 08:08:48 +02003173 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003174 }
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003175 goto done;
Willy Tarreau52eed752017-09-22 15:05:09 +02003176 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003177 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003178
3179 h2c->max_id = 0;
3180 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003181 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003182 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003183
3184 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003185 /* ensure that what is pending is a valid SETTINGS frame
3186 * without an ACK.
3187 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003188 TRACE_STATE("expecting settings", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003189 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003190 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003191 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau22de8d32018-09-05 19:55:58 +02003192 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003193 TRACE_ERROR("failed to receive settings", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003194 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003195 if (!(h2c->flags & H2_CF_IS_BACK))
3196 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003197 }
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003198 goto done;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003199 }
3200
3201 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
3202 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003203 TRACE_ERROR("unexpected frame type or flags", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003204 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3205 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003206 if (!(h2c->flags & H2_CF_IS_BACK))
3207 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003208 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003209 goto done;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003210 }
3211
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003212 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003213 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003214 TRACE_ERROR("invalid settings frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_SETTINGS|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003215 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3216 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003217 if (!(h2c->flags & H2_CF_IS_BACK))
3218 sess_log(h2c->conn->owner);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003219 goto done;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003220 }
3221
Willy Tarreau3bf69182018-12-21 15:34:50 +01003222 /* that's OK, switch to FRAME_P to process it. This is
3223 * a SETTINGS frame whose header has already been
3224 * deleted above.
3225 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01003226 padlen = 0;
Willy Tarreau4781b152021-04-06 13:53:36 +02003227 HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003228 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003229 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003230 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003231
3232 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02003233 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02003234 int ret = 0;
3235
Willy Tarreau7838a792019-08-12 18:42:03 +02003236 if (!b_data(&h2c->dbuf)) {
3237 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003238 h2c->flags |= H2_CF_DEM_SHORT_READ;
3239 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003240 }
3241
3242 if (h2c->st0 >= H2_CS_ERROR) {
3243 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003244 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003245 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003246
3247 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02003248 h2c->rcvd_s = 0;
3249
Willy Tarreau7838a792019-08-12 18:42:03 +02003250 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003251 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr)) {
3252 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003253 break;
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003254 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003255
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003256 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003257 TRACE_ERROR("invalid H2 frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003258 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003259 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02003260 /* only log if no other stream can report the error */
3261 sess_log(h2c->conn->owner);
3262 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003263 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003264 break;
3265 }
3266
Christopher Fauletdd2a5622019-06-18 12:22:38 +02003267 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003268 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
3269 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
3270 * we read the pad length and drop it from the remaining
3271 * payload (one byte + the 9 remaining ones = 10 total
3272 * removed), so we have a frame payload starting after the
3273 * pad len. Flow controlled frames (DATA) also count the
3274 * padlen in the flow control, so it must be adjusted.
3275 */
3276 if (hdr.len < 1) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003277 TRACE_ERROR("invalid H2 padded frame length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003278 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003279 if (!(h2c->flags & H2_CF_IS_BACK))
3280 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003281 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003282 goto done;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003283 }
3284 hdr.len--;
3285
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003286 if (b_data(&h2c->dbuf) < 10) {
3287 h2c->flags |= H2_CF_DEM_SHORT_READ;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003288 break; // missing padlen
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003289 }
Willy Tarreau3bf69182018-12-21 15:34:50 +01003290
3291 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3292
3293 if (padlen > hdr.len) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003294 TRACE_ERROR("invalid H2 padding length", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003295 /* RFC7540#6.1 : pad length = length of
3296 * frame payload or greater => error.
3297 */
3298 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003299 if (!(h2c->flags & H2_CF_IS_BACK))
3300 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003301 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003302 goto done;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003303 }
3304
3305 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3306 h2c->rcvd_c++;
3307 h2c->rcvd_s++;
3308 }
3309 b_del(&h2c->dbuf, 1);
3310 }
3311 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003312
3313 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003314 h2c->dfl = hdr.len;
3315 h2c->dsi = hdr.sid;
3316 h2c->dft = hdr.ft;
3317 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003318 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003319 TRACE_STATE("rcvd H2 frame header, switching to FRAME_P state", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003320 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003321
3322 /* check for minimum basic frame format validity */
3323 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3324 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003325 TRACE_ERROR("received invalid H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003326 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003327 if (!(h2c->flags & H2_CF_IS_BACK))
3328 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003329 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003330 goto done;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003331 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003332 }
3333
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003334 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3335 * H2_CS_FRAME_P indicates an incomplete previous operation
3336 * (most often the first attempt) and requires some validity
3337 * checks for the frame and the current state. The two other
3338 * ones are set after completion (or abortion) and must skip
3339 * validity checks.
3340 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003341 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3342
Willy Tarreau567beb82018-12-18 16:52:44 +01003343 if (tmp_h2s != h2s && h2s && h2s->cs &&
3344 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003345 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003346 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003347 (h2s->flags & H2_SF_ES_RCVD) ||
3348 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003349 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003350 TRACE_DEVEL("notifying stream before switching SID", H2_EV_RX_FRAME|H2_EV_STRM_WAKE, h2c->conn, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003351 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003352 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003353 }
3354 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003355
Willy Tarreau63864812019-08-07 14:25:20 +02003356 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003357 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3358 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003359 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003360 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003361
Willy Tarreau7e98c052017-10-10 15:56:59 +02003362 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003363 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003364 if (h2c->st0 == H2_CS_FRAME_P) {
3365 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003366 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003367 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003368 HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003369
Willy Tarreau7838a792019-08-12 18:42:03 +02003370 if (h2c->st0 == H2_CS_FRAME_A) {
3371 TRACE_PROTO("sending H2 SETTINGS ACK frame", H2_EV_TX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003372 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003373 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003374 break;
3375
Willy Tarreaucf68c782017-10-10 17:11:41 +02003376 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003377 if (h2c->st0 == H2_CS_FRAME_P) {
3378 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003379 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003380 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003381
Willy Tarreau7838a792019-08-12 18:42:03 +02003382 if (h2c->st0 == H2_CS_FRAME_A) {
3383 TRACE_PROTO("sending H2 PING ACK frame", H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003384 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003385 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003386 break;
3387
Willy Tarreau26f95952017-07-27 17:18:30 +02003388 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003389 if (h2c->st0 == H2_CS_FRAME_P) {
3390 TRACE_PROTO("receiving H2 WINDOW_UPDATE frame", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn, h2s);
Willy Tarreau26f95952017-07-27 17:18:30 +02003391 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003392 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003393 break;
3394
Willy Tarreau61290ec2017-10-17 08:19:21 +02003395 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003396 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003397 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3398 * frames' parsers consume all following CONTINUATION
3399 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003400 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003401 TRACE_ERROR("received unexpected H2 CONTINUATION frame", H2_EV_RX_FRAME|H2_EV_RX_CONT|H2_EV_H2C_ERR, h2c->conn, h2s);
Willy Tarreauea18f862018-12-22 20:19:26 +01003402 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003403 if (!(h2c->flags & H2_CF_IS_BACK))
3404 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003405 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003406 goto done;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003407
Willy Tarreau13278b42017-10-13 19:23:14 +02003408 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003409 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003410 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003411 if (h2c->flags & H2_CF_IS_BACK)
3412 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3413 else
3414 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003415 if (tmp_h2s) {
3416 h2s = tmp_h2s;
3417 ret = 1;
3418 }
3419 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003420 HA_ATOMIC_INC(&h2c->px_counters->headers_rcvd);
Willy Tarreau13278b42017-10-13 19:23:14 +02003421 break;
3422
Willy Tarreau454f9052017-10-26 19:40:35 +02003423 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003424 if (h2c->st0 == H2_CS_FRAME_P) {
3425 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01003426 ret = h2c_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003427 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003428 HA_ATOMIC_INC(&h2c->px_counters->data_rcvd);
Willy Tarreau454f9052017-10-26 19:40:35 +02003429
Willy Tarreau7838a792019-08-12 18:42:03 +02003430 if (h2c->st0 == H2_CS_FRAME_A) {
3431 TRACE_PROTO("sending stream WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003432 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003433 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003434 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003435
Willy Tarreau92153fc2017-12-03 19:46:19 +01003436 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003437 if (h2c->st0 == H2_CS_FRAME_P) {
3438 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003439 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003440 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003441 break;
3442
Willy Tarreaucd234e92017-08-18 10:59:39 +02003443 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003444 if (h2c->st0 == H2_CS_FRAME_P) {
3445 TRACE_PROTO("receiving H2 RST_STREAM frame", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003446 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003447 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003448 HA_ATOMIC_INC(&h2c->px_counters->rst_stream_rcvd);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003449 break;
3450
Willy Tarreaue96b0922017-10-30 00:28:29 +01003451 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003452 if (h2c->st0 == H2_CS_FRAME_P) {
3453 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003454 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003455 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003456 HA_ATOMIC_INC(&h2c->px_counters->goaway_rcvd);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003457 break;
3458
Willy Tarreau1c661982017-10-30 13:52:01 +01003459 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003460 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003461 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003462 /* drop frames that we ignore. They may be larger than
3463 * the buffer so we drain all of their contents until
3464 * we reach the end.
3465 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003466 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3467 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003468 h2c->dfl -= ret;
3469 ret = h2c->dfl == 0;
3470 }
3471
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003472 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003473 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003474 if (h2s->st == H2_SS_ERROR) {
3475 TRACE_STATE("stream error, switching to FRAME_E", H2_EV_RX_FRAME|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreaua20a5192017-12-27 11:02:06 +01003476 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003477 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003478
Willy Tarreau7838a792019-08-12 18:42:03 +02003479 if (h2c->st0 == H2_CS_FRAME_E) {
3480 TRACE_PROTO("sending H2 RST_STREAM frame", H2_EV_TX_FRAME|H2_EV_TX_RST|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreaua20a5192017-12-27 11:02:06 +01003481 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003482 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003483
Willy Tarreau7e98c052017-10-10 15:56:59 +02003484 /* error or missing data condition met above ? */
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003485 if (ret <= 0)
Willy Tarreau7e98c052017-10-10 15:56:59 +02003486 break;
3487
3488 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003489 if (h2c->dfl)
3490 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003491 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3492 b_del(&h2c->dbuf, ret);
3493 h2c->dfl -= ret;
3494 if (!h2c->dfl) {
3495 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3496 h2c->st0 = H2_CS_FRAME_H;
3497 h2c->dsi = -1;
3498 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003499 }
3500 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003501
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003502 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003503 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3504 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003505 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003506 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003507
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003508 done:
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003509 if (h2c->st0 >= H2_CS_ERROR || (h2c->flags & H2_CF_DEM_SHORT_READ)) {
3510 if (h2c->flags & H2_CF_RCVD_SHUT)
3511 h2c->flags |= H2_CF_END_REACHED;
3512 }
3513
Willy Tarreau567beb82018-12-18 16:52:44 +01003514 if (h2s && h2s->cs &&
3515 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003516 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003517 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003518 (h2s->flags & H2_SF_ES_RCVD) ||
3519 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003520 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003521 TRACE_DEVEL("notifying stream before switching SID", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003522 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003523 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003524 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003525
Willy Tarreau7838a792019-08-12 18:42:03 +02003526 if (old_iw != h2c->miw) {
3527 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003528 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003529 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003530
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003531 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003532 out:
3533 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003534 return;
Willy Tarreaubc933932017-10-09 16:21:43 +02003535}
3536
Willy Tarreau989539b2020-01-10 17:01:29 +01003537/* resume each h2s eligible for sending in list head <head> */
3538static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3539{
3540 struct h2s *h2s, *h2s_back;
3541
3542 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3543
3544 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3545 if (h2c->mws <= 0 ||
3546 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3547 h2c->st0 >= H2_CS_ERROR)
3548 break;
3549
3550 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003551
Willy Tarreaud9464162020-01-10 18:25:07 +01003552 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003553 continue;
3554
Willy Tarreau5723f292020-01-10 15:16:57 +01003555 /* If the sender changed his mind and unsubscribed, let's just
3556 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003557 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003558 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3559 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003560 LIST_DEL_INIT(&h2s->list);
3561 continue;
3562 }
3563
Willy Tarreauf96508a2020-01-10 11:12:48 +01003564 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003565 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003566 tasklet_wakeup(h2s->subs->tasklet);
3567 h2s->subs->events &= ~SUB_RETRY_SEND;
3568 if (!h2s->subs->events)
3569 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003570 }
3571 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3572 tasklet_wakeup(h2s->shut_tl);
3573 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003574 }
3575
3576 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3577}
3578
Willy Tarreaubc933932017-10-09 16:21:43 +02003579/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3580 * the end.
3581 */
3582static int h2_process_mux(struct h2c *h2c)
3583{
Willy Tarreau7838a792019-08-12 18:42:03 +02003584 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3585
Willy Tarreau01b44822018-10-03 14:26:37 +02003586 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3587 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3588 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3589 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003590 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003591 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003592 goto fail;
3593 }
3594 h2c->st0 = H2_CS_SETTINGS1;
3595 }
3596 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003597 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003598 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003599 }
3600
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003601 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003602 if (h2c->rcvd_s > 0 &&
3603 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3604 h2c_send_strm_wu(h2c) < 0)
3605 goto fail;
3606
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003607 if (h2c->rcvd_c > 0 &&
3608 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3609 h2c_send_conn_wu(h2c) < 0)
3610 goto fail;
3611
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003612 /* First we always process the flow control list because the streams
3613 * waiting there were already elected for immediate emission but were
3614 * blocked just on this.
3615 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003616 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3617 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003618
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003619 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003620 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003621 if (h2c->st0 == H2_CS_ERROR) {
3622 if (h2c->max_id >= 0) {
3623 h2c_send_goaway_error(h2c, NULL);
3624 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003625 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003626 }
3627
3628 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3629 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003630 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003631 done:
3632 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3633 return 1;
3634 out0:
3635 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3636 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003637}
3638
Willy Tarreau62f52692017-10-08 23:01:42 +02003639
Willy Tarreau479998a2018-11-18 06:30:59 +01003640/* Attempt to read data, and subscribe if none available.
3641 * The function returns 1 if data has been received, otherwise zero.
3642 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003643static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003644{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003645 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003646 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003647 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003648 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003649
Willy Tarreau7838a792019-08-12 18:42:03 +02003650 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3651
3652 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3653 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003654 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003655 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003656
Willy Tarreau7838a792019-08-12 18:42:03 +02003657 if (!h2_recv_allowed(h2c)) {
3658 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003659 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003660 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003661
Willy Tarreau44e973f2018-03-01 17:49:30 +01003662 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003663 if (!buf) {
3664 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003665 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003666 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003667 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003668
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003669 if (h2c->flags & H2_CF_RCVD_SHUT) {
3670 TRACE_DEVEL("leaving on rcvd_shut", H2_EV_H2C_RECV, h2c->conn);
3671 return 0;
3672 }
3673
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003674 if (!b_data(buf)) {
3675 /* try to pre-align the buffer like the
3676 * rxbufs will be to optimize memory copies. We'll make
3677 * sure that the frame header lands at the end of the
3678 * HTX block to alias it upon recv. We cannot use the
3679 * head because rcv_buf() will realign the buffer if
3680 * it's empty. Thus we cheat and pretend we already
3681 * have a few bytes there.
3682 */
3683 max = buf_room_for_htx_data(buf) + 9;
3684 buf->head = sizeof(struct htx) - 9;
3685 }
3686 else
3687 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003688
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003689 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003690
Christopher Fauletde9d6052021-04-23 12:25:18 +02003691 if (max && !ret && h2_recv_allowed(h2c)) {
3692 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
3693 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003694 } else if (ret) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02003695 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Christopher Fauleta9cc1e82021-07-26 12:06:53 +02003696 h2c->flags &= ~H2_CF_DEM_SHORT_READ;
3697 }
Olivier Houchard81a15af2018-10-19 17:26:49 +02003698
Christopher Fauletde9d6052021-04-23 12:25:18 +02003699 if (conn_xprt_read0_pending(h2c->conn)) {
3700 TRACE_DATA("received read0", H2_EV_H2C_RECV, h2c->conn);
3701 h2c->flags |= H2_CF_RCVD_SHUT;
3702 }
3703
Olivier Houcharda1411e62018-08-17 18:42:48 +02003704 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003705 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003706 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003707 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003708 }
3709
Willy Tarreau7838a792019-08-12 18:42:03 +02003710 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003711 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003712 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003713 }
3714
3715 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003716 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003717}
3718
Willy Tarreau479998a2018-11-18 06:30:59 +01003719/* Try to send data if possible.
3720 * The function returns 1 if data have been sent, otherwise zero.
3721 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003722static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003723{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003724 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003725 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003726 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003727
Willy Tarreau7838a792019-08-12 18:42:03 +02003728 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003729
Willy Tarreau7838a792019-08-12 18:42:03 +02003730 if (conn->flags & CO_FL_ERROR) {
3731 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3732 return 1;
3733 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003734
Willy Tarreau911db9b2020-01-23 16:27:54 +01003735 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003736 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003737 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003738 }
3739
Willy Tarreaubc933932017-10-09 16:21:43 +02003740 /* This loop is quite simple : it tries to fill as much as it can from
3741 * pending streams into the existing buffer until it's reportedly full
3742 * or the end of send requests is reached. Then it tries to send this
3743 * buffer's contents out, marks it not full if at least one byte could
3744 * be sent, and tries again.
3745 *
3746 * The snd_buf() function normally takes a "flags" argument which may
3747 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3748 * data immediately comes and CO_SFL_STREAMER to indicate that the
3749 * connection is streaming lots of data (used to increase TLS record
3750 * size at the expense of latency). The former can be sent any time
3751 * there's a buffer full flag, as it indicates at least one stream
3752 * attempted to send and failed so there are pending data. An
3753 * alternative would be to set it as long as there's an active stream
3754 * but that would be problematic for ACKs until we have an absolute
3755 * guarantee that all waiters have at least one byte to send. The
3756 * latter should possibly not be set for now.
3757 */
3758
3759 done = 0;
3760 while (!done) {
3761 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003762 unsigned int released = 0;
3763 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003764
3765 /* fill as much as we can into the current buffer */
3766 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3767 done = h2_process_mux(h2c);
3768
Olivier Houchard2b094432019-01-29 18:28:36 +01003769 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003770 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003771
Christopher Faulet9a3d3fc2020-10-22 16:24:58 +02003772 if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) ||
3773 (h2c->st0 == H2_CS_ERROR2) || (h2c->flags & H2_CF_GOAWAY_FAILED))
Willy Tarreaubc933932017-10-09 16:21:43 +02003774 break;
3775
3776 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3777 flags |= CO_SFL_MSG_MORE;
3778
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003779 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3780 if (b_data(buf)) {
3781 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003782 if (!ret) {
3783 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003784 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003785 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003786 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003787 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003788 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003789 if (b_data(buf)) {
3790 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003791 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003792 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003793 }
3794 b_free(buf);
3795 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003796 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003797
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003798 if (released)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01003799 offer_buffers(NULL, released);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003800
Willy Tarreaubc933932017-10-09 16:21:43 +02003801 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003802 if (sent)
3803 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003804 }
3805
Willy Tarreaua2af5122017-10-09 11:56:46 +02003806 if (conn->flags & CO_FL_SOCK_WR_SH) {
3807 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003808 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003809 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003810 /* We're not full anymore, so we can wake any task that are waiting
3811 * for us.
3812 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003813 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3814 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003815
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003816 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003817 if (!br_data(h2c->mbuf)) {
3818 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003819 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003820 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003821schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003822 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3823 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003824 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003825 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003826
Willy Tarreau7838a792019-08-12 18:42:03 +02003827 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003828 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003829}
3830
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003831/* this is the tasklet referenced in h2c->wait_event.tasklet */
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003832struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state)
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003833{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003834 struct connection *conn;
3835 struct tasklet *tl = (struct tasklet *)t;
3836 int conn_in_list;
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003837 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02003838 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003839
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003840 if (state & TASK_F_USR1) {
3841 /* the tasklet was idling on an idle connection, it might have
3842 * been stolen, let's be careful!
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003843 */
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003844 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3845 if (t->context == NULL) {
3846 /* The connection has been taken over by another thread,
3847 * we're no longer responsible for it, so just free the
3848 * tasklet, and do nothing.
3849 */
3850 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3851 tasklet_free(tl);
Willy Tarreau74163142021-03-13 11:30:19 +01003852 t = NULL;
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003853 goto leave;
3854 }
3855 conn = h2c->conn;
3856 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003857
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003858 conn_in_list = conn->flags & CO_FL_LIST_MASK;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003859
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003860 /* Remove the connection from the list, to be sure nobody attempts
3861 * to use it while we handle the I/O events
3862 */
3863 if (conn_in_list)
3864 conn_delete_from_tree(&conn->hash_node->node);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003865
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003866 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3867 } else {
3868 /* we're certain the connection was not in an idle list */
3869 conn = h2c->conn;
3870 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3871 conn_in_list = 0;
3872 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003873
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003874 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003875 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003876 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003877 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003878 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003879 ret = h2_process(h2c);
3880
3881 /* If we were in an idle list, we want to add it back into it,
3882 * unless h2_process() returned -1, which mean it has destroyed
3883 * the connection (testing !ret is enough, if h2_process() wasn't
3884 * called then ret will be 0 anyway.
3885 */
Willy Tarreau74163142021-03-13 11:30:19 +01003886 if (ret < 0)
3887 t = NULL;
3888
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003889 if (!ret && conn_in_list) {
3890 struct server *srv = objt_server(conn->target);
3891
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003892 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003893 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreau430bf4a2021-03-04 09:45:32 +01003894 ebmb_insert(&srv->per_thr[tid].safe_conns, &conn->hash_node->node, sizeof(conn->hash_node->hash));
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003895 else
Willy Tarreau430bf4a2021-03-04 09:45:32 +01003896 ebmb_insert(&srv->per_thr[tid].idle_conns, &conn->hash_node->node, sizeof(conn->hash_node->hash));
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003897 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003898 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003899
Willy Tarreau38468772020-06-28 00:31:13 +02003900leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003901 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreau74163142021-03-13 11:30:19 +01003902 return t;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003903}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003904
Willy Tarreau62f52692017-10-08 23:01:42 +02003905/* callback called on any event by the connection handler.
3906 * It applies changes and returns zero, or < 0 if it wants immediate
3907 * destruction of the connection (which normally doesn not happen in h2).
3908 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003909static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003910{
Olivier Houchard7505f942018-08-21 18:10:44 +02003911 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003912
Willy Tarreau7838a792019-08-12 18:42:03 +02003913 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3914
Willy Tarreauf0961222021-02-05 11:41:46 +01003915 if (!(h2c->flags & H2_CF_DEM_BLOCK_ANY) &&
3916 (b_data(&h2c->dbuf) || (h2c->flags & H2_CF_RCVD_SHUT))) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003917 h2_process_demux(h2c);
3918
3919 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003920 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003921
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003922 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003923 h2c->flags &= ~H2_CF_DEM_DFULL;
3924 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003925 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003926
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003927 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003928 /* frontend is stopping, reload likely in progress, let's try
3929 * to announce a graceful shutdown if not yet done. We don't
3930 * care if it fails, it will be tried again later.
3931 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003932 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003933 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3934 if (h2c->last_sid < 0)
3935 h2c->last_sid = (1U << 31) - 1;
3936 h2c_send_goaway_error(h2c, NULL);
3937 }
3938 }
3939
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003940 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003941 * If we received early data, and the handshake is done, wake
3942 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003943 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003944 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003945 (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003946 struct eb32_node *node;
3947 struct h2s *h2s;
3948
3949 h2c->flags |= H2_CF_WAIT_FOR_HS;
3950 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3951
3952 while (node) {
3953 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003954 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003955 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003956 node = eb32_next(node);
3957 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003958 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003959
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003960 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003961 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3962 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3963 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003964 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003965
3966 if (eb_is_empty(&h2c->streams_by_id)) {
3967 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003968 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003969 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003970 return -1;
3971 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003972
3973 /* connections in error must be removed from the idle lists */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003974 if (conn->flags & CO_FL_LIST_MASK) {
3975 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01003976 conn_delete_from_tree(&conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003977 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3978 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003979 }
3980 else if (h2c->st0 == H2_CS_ERROR) {
3981 /* connections in error must be removed from the idle lists */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003982 if (conn->flags & CO_FL_LIST_MASK) {
3983 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01003984 conn_delete_from_tree(&conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003985 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3986 }
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003987 }
3988
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003989 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003990 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003991
Olivier Houchard53216e72018-10-10 15:46:36 +02003992 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3993 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3994 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003995 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003996 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3997 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003998 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003999
Willy Tarreau3f133572017-10-31 19:21:06 +01004000 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004001 if (h2c_may_expire(h2c))
4002 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4003 else
4004 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004005 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01004006 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02004007
Olivier Houchard7505f942018-08-21 18:10:44 +02004008 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004009 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004010 return 0;
4011}
4012
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004013/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02004014static int h2_wake(struct connection *conn)
4015{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004016 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02004017 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02004018
Willy Tarreau7838a792019-08-12 18:42:03 +02004019 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
4020 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01004021 if (ret >= 0)
4022 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02004023 TRACE_LEAVE(H2_EV_H2C_WAKE);
4024 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02004025}
4026
Willy Tarreauea392822017-10-31 10:02:25 +01004027/* Connection timeout management. The principle is that if there's no receipt
4028 * nor sending for a certain amount of time, the connection is closed. If the
4029 * MUX buffer still has lying data or is not allocatable, the connection is
4030 * immediately killed. If it's allocatable and empty, we attempt to send a
4031 * GOAWAY frame.
4032 */
Willy Tarreau144f84a2021-03-02 16:09:26 +01004033struct task *h2_timeout_task(struct task *t, void *context, unsigned int state)
Willy Tarreauea392822017-10-31 10:02:25 +01004034{
Olivier Houchard9f6af332018-05-25 14:04:04 +02004035 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01004036 int expired = tick_is_expired(t->expire, now_ms);
4037
Willy Tarreau7838a792019-08-12 18:42:03 +02004038 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
4039
Willy Tarreaubd42e922020-06-30 11:19:23 +02004040 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004041 /* Make sure nobody stole the connection from us */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004042 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004043
4044 /* Somebody already stole the connection from us, so we should not
4045 * free it, we just have to free the task.
4046 */
4047 if (!t->context) {
4048 h2c = NULL;
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004049 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004050 goto do_leave;
4051 }
4052
4053
Willy Tarreaubd42e922020-06-30 11:19:23 +02004054 if (!expired) {
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004055 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004056 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
4057 return t;
4058 }
Willy Tarreauea392822017-10-31 10:02:25 +01004059
Willy Tarreaubd42e922020-06-30 11:19:23 +02004060 if (!h2c_may_expire(h2c)) {
4061 /* we do still have streams but all of them are idle, waiting
4062 * for the data layer, so we must not enforce the timeout here.
4063 */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004064 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004065 t->expire = TICK_ETERNITY;
4066 return t;
4067 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004068
Willy Tarreaubd42e922020-06-30 11:19:23 +02004069 /* We're about to destroy the connection, so make sure nobody attempts
4070 * to steal it from us.
4071 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02004072 if (h2c->conn->flags & CO_FL_LIST_MASK)
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004073 conn_delete_from_tree(&h2c->conn->hash_node->node);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004074
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004075 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004076 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004077
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004078do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02004079 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02004080
4081 if (!h2c) {
4082 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02004083 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02004084 return NULL;
4085 }
4086
4087 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01004088 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02004089 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01004090
Willy Tarreau662fafc2019-05-26 09:43:07 +02004091 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01004092 /* don't even try to send a GOAWAY, the buffer is stuck */
4093 h2c->flags |= H2_CF_GOAWAY_FAILED;
4094 }
4095
4096 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01004097 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01004098 if (h2c_send_goaway_error(h2c, NULL) <= 0)
4099 h2c->flags |= H2_CF_GOAWAY_FAILED;
4100
Willy Tarreau662fafc2019-05-26 09:43:07 +02004101 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004102 unsigned int released = 0;
4103 struct buffer *buf;
4104
4105 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
4106 if (b_data(buf)) {
4107 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
4108 if (!ret)
4109 break;
4110 b_del(buf, ret);
4111 if (b_data(buf))
4112 break;
4113 b_free(buf);
4114 released++;
4115 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02004116 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004117
4118 if (released)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01004119 offer_buffers(NULL, released);
Willy Tarreau787db9a2018-06-14 18:31:46 +02004120 }
Willy Tarreauea392822017-10-31 10:02:25 +01004121
Willy Tarreau4481e262019-10-31 15:36:30 +01004122 /* in any case this connection must not be considered idle anymore */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01004123 if (h2c->conn->flags & CO_FL_LIST_MASK) {
4124 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004125 conn_delete_from_tree(&h2c->conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01004126 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
4127 }
Willy Tarreau4481e262019-10-31 15:36:30 +01004128
Willy Tarreau0975f112018-03-29 15:22:59 +02004129 /* either we can release everything now or it will be done later once
4130 * the last stream closes.
4131 */
4132 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02004133 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01004134
Willy Tarreau7838a792019-08-12 18:42:03 +02004135 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01004136 return NULL;
4137}
4138
4139
Willy Tarreau62f52692017-10-08 23:01:42 +02004140/*******************************************/
4141/* functions below are used by the streams */
4142/*******************************************/
4143
4144/*
4145 * Attach a new stream to a connection
4146 * (Used for outgoing connections)
4147 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01004148static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02004149{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004150 struct conn_stream *cs;
4151 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004152 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004153
Willy Tarreau7838a792019-08-12 18:42:03 +02004154 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02004155 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02004156 if (!cs) {
4157 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004158 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004159 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01004160 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004161 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004162 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004163 cs_free(cs);
4164 return NULL;
4165 }
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004166
4167 /* the connection is not idle anymore, let's mark this */
4168 HA_ATOMIC_AND(&h2c->wait_event.tasklet->state, ~TASK_F_USR1);
Willy Tarreau4f8cd432021-03-02 17:27:58 +01004169 xprt_set_used(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004170
Willy Tarreau7838a792019-08-12 18:42:03 +02004171 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004172 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02004173}
4174
Willy Tarreaufafd3982018-11-18 21:29:20 +01004175/* Retrieves the first valid conn_stream from this connection, or returns NULL.
4176 * We have to scan because we may have some orphan streams. It might be
4177 * beneficial to scan backwards from the end to reduce the likeliness to find
4178 * orphans.
4179 */
4180static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
4181{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004182 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01004183 struct h2s *h2s;
4184 struct eb32_node *node;
4185
4186 node = eb32_first(&h2c->streams_by_id);
4187 while (node) {
4188 h2s = container_of(node, struct h2s, by_id);
4189 if (h2s->cs)
4190 return h2s->cs;
4191 node = eb32_next(node);
4192 }
4193 return NULL;
4194}
4195
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004196static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
4197{
4198 int ret = 0;
4199 struct h2c *h2c = conn->ctx;
4200
4201 switch (mux_ctl) {
4202 case MUX_STATUS:
4203 /* Only consider the mux to be ready if we're done with
4204 * the preface and settings, and we had no error.
4205 */
4206 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
4207 ret |= MUX_STATUS_READY;
4208 return ret;
Christopher Faulet4c8ad842020-10-06 14:59:17 +02004209 case MUX_EXIT_STATUS:
4210 return MUX_ES_UNKNOWN;
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004211 default:
4212 return -1;
4213 }
4214}
4215
Willy Tarreau62f52692017-10-08 23:01:42 +02004216/*
Olivier Houchard060ed432018-11-06 16:32:42 +01004217 * Destroy the mux and the associated connection, if it is no longer used
4218 */
Christopher Faulet73c12072019-04-08 11:23:22 +02004219static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01004220{
Christopher Faulet73c12072019-04-08 11:23:22 +02004221 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01004222
Willy Tarreau7838a792019-08-12 18:42:03 +02004223 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02004224 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02004225 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004226 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01004227}
4228
4229/*
Willy Tarreau62f52692017-10-08 23:01:42 +02004230 * Detach the stream from the connection and possibly release the connection.
4231 */
4232static void h2_detach(struct conn_stream *cs)
4233{
Willy Tarreau60935142017-10-16 18:11:19 +02004234 struct h2s *h2s = cs->ctx;
4235 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01004236 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004237
Willy Tarreau7838a792019-08-12 18:42:03 +02004238 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
4239
Willy Tarreau60935142017-10-16 18:11:19 +02004240 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004241 if (!h2s) {
4242 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02004243 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004244 }
Willy Tarreau60935142017-10-16 18:11:19 +02004245
Willy Tarreaud9464162020-01-10 18:25:07 +01004246 /* there's no txbuf so we're certain not to be able to send anything */
4247 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02004248
Olivier Houchardf502aca2018-12-14 19:42:40 +01004249 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004250 h2c = h2s->h2c;
4251 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02004252 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01004253 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
4254 !h2_frt_has_too_many_cs(h2c)) {
4255 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02004256 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004257 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02004258 }
Willy Tarreau60935142017-10-16 18:11:19 +02004259
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004260 /* this stream may be blocked waiting for some data to leave (possibly
4261 * an ES or RST frame), so orphan it in this case.
4262 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02004263 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02004264 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01004265 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01004266 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004267 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004268 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004269 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004270
Willy Tarreau45f752e2017-10-30 15:44:59 +01004271 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
4272 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
4273 /* unblock the connection if it was blocked on this
4274 * stream.
4275 */
4276 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
4277 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004278 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01004279 }
4280
Willy Tarreau71049cc2018-03-28 13:56:39 +02004281 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02004282
Christopher Faulet9b79a102019-07-15 11:22:56 +02004283 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01004284 if (!(h2c->conn->flags &
4285 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004286 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02004287 /* Add the connection in the session server list, if not already done */
4288 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
4289 h2c->conn->owner = NULL;
4290 if (eb_is_empty(&h2c->streams_by_id)) {
4291 h2c->conn->mux->destroy(h2c);
4292 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4293 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02004294 }
4295 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02004296 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004297 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
4298 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
4299 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01004300 return;
4301 }
4302 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004303 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004304 else {
4305 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004306 /* If the connection is owned by the session, first remove it
4307 * from its list
4308 */
4309 if (h2c->conn->owner) {
4310 session_unown_conn(h2c->conn->owner, h2c->conn);
4311 h2c->conn->owner = NULL;
4312 }
4313
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004314 /* mark that the tasklet may lose its context to another thread and
4315 * that the handler needs to check it under the idle conns lock.
4316 */
4317 HA_ATOMIC_OR(&h2c->wait_event.tasklet->state, TASK_F_USR1);
Willy Tarreau4f8cd432021-03-02 17:27:58 +01004318 xprt_set_idle(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
4319
Olivier Houcharddc2f2752020-02-13 19:12:07 +01004320 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01004321 /* The server doesn't want it, let's kill the connection right away */
4322 h2c->conn->mux->destroy(h2c);
4323 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4324 return;
4325 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01004326 /* At this point, the connection has been added to the
4327 * server idle list, so another thread may already have
4328 * hijacked it, so we can't do anything with it.
4329 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01004330 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
4331 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01004332
Olivier Houchard8a786902018-12-15 16:05:40 +01004333 }
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004334 else if (!h2c->conn->hash_node->node.node.leaf_p &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004335 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
Willy Tarreau2b718102021-04-21 07:32:39 +02004336 !LIST_INLIST(&h2c->conn->session_list)) {
Willy Tarreau430bf4a2021-03-04 09:45:32 +01004337 ebmb_insert(&__objt_server(h2c->conn->target)->per_thr[tid].avail_conns,
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004338 &h2c->conn->hash_node->node,
4339 sizeof(h2c->conn->hash_node->hash));
Christopher Fauletc5579d12020-07-01 15:45:41 +02004340 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004341 }
4342 }
4343 }
4344
Willy Tarreaue323f342018-03-28 13:51:45 +02004345 /* We don't want to close right now unless we're removing the
4346 * last stream, and either the connection is in error, or it
4347 * reached the ID already specified in a GOAWAY frame received
4348 * or sent (as seen by last_sid >= 0).
4349 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004350 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004351 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004352 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004353 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004354 }
4355 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004356 if (h2c_may_expire(h2c))
4357 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4358 else
4359 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004360 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004361 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004362 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004363 else
4364 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004365}
4366
Willy Tarreau88bdba32019-05-13 18:17:53 +02004367/* Performs a synchronous or asynchronous shutr(). */
4368static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004369{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004370 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004371
Willy Tarreauf983d002019-05-14 10:40:21 +02004372 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004373 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004374
Willy Tarreau7838a792019-08-12 18:42:03 +02004375 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4376
Willy Tarreau18059042019-01-31 19:12:48 +01004377 /* a connstream may require us to immediately kill the whole connection
4378 * for example because of a "tcp-request content reject" rule that is
4379 * normally used to limit abuse. In this case we schedule a goaway to
4380 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004381 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004382 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004383 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004384 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004385 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4386 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4387 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004388 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4389 /* Nothing was never sent for this stream, so reset with
4390 * REFUSED_STREAM error to let the client retry the
4391 * request.
4392 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004393 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004394 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4395 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004396 else {
4397 /* a final response was already provided, we don't want this
4398 * stream anymore. This may happen when the server responds
4399 * before the end of an upload and closes quickly (redirect,
4400 * deny, ...)
4401 */
4402 h2s_error(h2s, H2_ERR_CANCEL);
4403 }
Willy Tarreau18059042019-01-31 19:12:48 +01004404
Willy Tarreau90c32322017-11-24 08:00:30 +01004405 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004406 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004407 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004408
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004409 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004410 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004411 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004412 done:
4413 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004414 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004415 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004416add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004417 /* Let the handler know we want to shutr, and add ourselves to the
4418 * most relevant list if not yet done. h2_deferred_shut() will be
4419 * automatically called via the shut_tl tasklet when there's room
4420 * again.
4421 */
4422 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreau2b718102021-04-21 07:32:39 +02004423 if (!LIST_INLIST(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004424 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02004425 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004426 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Willy Tarreau2b718102021-04-21 07:32:39 +02004427 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004428 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004429 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004430 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004431}
4432
Willy Tarreau88bdba32019-05-13 18:17:53 +02004433/* Performs a synchronous or asynchronous shutw(). */
4434static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004435{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004436 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004437
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004438 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004439 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004440
Willy Tarreau7838a792019-08-12 18:42:03 +02004441 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4442
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004443 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004444 /* we can cleanly close using an empty data frame only after headers */
4445
4446 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4447 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004448 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004449
4450 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004451 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004452 else
4453 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004454 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004455 /* a connstream may require us to immediately kill the whole connection
4456 * for example because of a "tcp-request content reject" rule that is
4457 * normally used to limit abuse. In this case we schedule a goaway to
4458 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004459 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004460 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004461 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004462 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004463 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4464 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4465 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004466 else {
4467 /* Nothing was never sent for this stream, so reset with
4468 * REFUSED_STREAM error to let the client retry the
4469 * request.
4470 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004471 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004472 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4473 }
Willy Tarreau18059042019-01-31 19:12:48 +01004474
Willy Tarreau90c32322017-11-24 08:00:30 +01004475 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004476 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004477 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004478
Willy Tarreau00dd0782018-03-01 16:31:34 +01004479 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004480 }
4481
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004482 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004483 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004484
4485 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4486
Willy Tarreau88bdba32019-05-13 18:17:53 +02004487 done:
4488 h2s->flags &= ~H2_SF_WANT_SHUTW;
4489 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004490
4491 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004492 /* Let the handler know we want to shutw, and add ourselves to the
4493 * most relevant list if not yet done. h2_deferred_shut() will be
4494 * automatically called via the shut_tl tasklet when there's room
4495 * again.
4496 */
4497 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreau2b718102021-04-21 07:32:39 +02004498 if (!LIST_INLIST(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004499 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02004500 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004501 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Willy Tarreau2b718102021-04-21 07:32:39 +02004502 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004503 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004504 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004505 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004506}
4507
Willy Tarreau5723f292020-01-10 15:16:57 +01004508/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004509 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4510 * and prevented the last frame from being emitted.
4511 */
Willy Tarreau144f84a2021-03-02 16:09:26 +01004512struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state)
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004513{
4514 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004515 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004516
Willy Tarreau7838a792019-08-12 18:42:03 +02004517 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4518
Willy Tarreau5723f292020-01-10 15:16:57 +01004519 if (h2s->flags & H2_SF_NOTIFIED) {
4520 /* some data processing remains to be done first */
4521 goto end;
4522 }
4523
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004524 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004525 h2_do_shutw(h2s);
4526
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004527 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004528 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004529
Willy Tarreau88bdba32019-05-13 18:17:53 +02004530 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004531 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004532 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004533
Willy Tarreau88bdba32019-05-13 18:17:53 +02004534 if (!h2s->cs) {
4535 h2s_destroy(h2s);
Willy Tarreau74163142021-03-13 11:30:19 +01004536 if (h2c_is_dead(h2c)) {
Willy Tarreau88bdba32019-05-13 18:17:53 +02004537 h2_release(h2c);
Willy Tarreau74163142021-03-13 11:30:19 +01004538 t = NULL;
4539 }
Willy Tarreau88bdba32019-05-13 18:17:53 +02004540 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004541 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004542 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004543 TRACE_LEAVE(H2_EV_STRM_SHUT);
Willy Tarreau74163142021-03-13 11:30:19 +01004544 return t;
Willy Tarreau62f52692017-10-08 23:01:42 +02004545}
4546
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004547/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004548static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4549{
4550 struct h2s *h2s = cs->ctx;
4551
Willy Tarreau7838a792019-08-12 18:42:03 +02004552 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004553 if (cs->flags & CS_FL_KILL_CONN)
4554 h2s->flags |= H2_SF_KILL_CONN;
4555
Willy Tarreau7838a792019-08-12 18:42:03 +02004556 if (mode)
4557 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004558
Willy Tarreau7838a792019-08-12 18:42:03 +02004559 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004560}
4561
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004562/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004563static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4564{
4565 struct h2s *h2s = cs->ctx;
4566
Willy Tarreau7838a792019-08-12 18:42:03 +02004567 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004568 if (cs->flags & CS_FL_KILL_CONN)
4569 h2s->flags |= H2_SF_KILL_CONN;
4570
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004571 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004572 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004573}
4574
Christopher Faulet9b79a102019-07-15 11:22:56 +02004575/* Decode the payload of a HEADERS frame and produce the HTX request or response
4576 * depending on the connection's side. Returns a positive value on success, a
4577 * negative value on failure, or 0 if it couldn't proceed. May report connection
4578 * errors in h2c->errcode if the frame is non-decodable and the connection
4579 * unrecoverable. In absence of connection error when a failure is reported, the
4580 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004581 *
4582 * The function may fold CONTINUATION frames into the initial HEADERS frame
4583 * by removing padding and next frame header, then moving the CONTINUATION
4584 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4585 * leaving a hole between the main frame and the beginning of the next one.
4586 * The possibly remaining incomplete or next frame at the end may be moved
4587 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4588 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4589 *
4590 * A buffer at the beginning of processing may look like this :
4591 *
4592 * ,---.---------.-----.--------------.--------------.------.---.
4593 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4594 * `---^---------^-----^--------------^--------------^------^---'
4595 * | | <-----> | |
4596 * area | dpl | wrap
4597 * |<--------------> |
4598 * | dfl |
4599 * |<-------------------------------------------------->|
4600 * head data
4601 *
4602 * Padding is automatically overwritten when folding, participating to the
4603 * hole size after dfl :
4604 *
4605 * ,---.------------------------.-----.--------------.------.---.
4606 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4607 * `---^------------------------^-----^--------------^------^---'
4608 * | | <-----> | |
4609 * area | hole | wrap
4610 * |<-----------------------> |
4611 * | dfl |
4612 * |<-------------------------------------------------->|
4613 * head data
4614 *
4615 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4616 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4617 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004618 *
4619 * The <flags> field must point to either the stream's flags or to a copy of it
4620 * so that the function can update the following flags :
4621 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004622 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004623 *
4624 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4625 * decoding, in order to detect if we're dealing with a headers or a trailers
4626 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004627 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01004628static int h2c_decode_headers(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len, char *upgrade_protocol)
Willy Tarreau13278b42017-10-13 19:23:14 +02004629{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004630 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004631 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004632 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004633 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004634 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004635 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004636 int flen; // header frame len
4637 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004638 int ret = 0;
4639 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004640 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004641
Willy Tarreau7838a792019-08-12 18:42:03 +02004642 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4643
Willy Tarreauea18f862018-12-22 20:19:26 +01004644next_frame:
4645 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4646 goto leave; // incomplete input frame
4647
4648 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4649 * this case, we'll try to paste it immediately after the initial
4650 * HEADERS frame payload and kill any possible padding. The initial
4651 * frame's length will be increased to represent the concatenation
4652 * of the two frames. The next frame is read from position <tlen>
4653 * and written at position <flen> (minus padding if some is present).
4654 */
4655 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4656 struct h2_fh hdr;
4657 int clen; // CONTINUATION frame's payload length
4658
Willy Tarreau7838a792019-08-12 18:42:03 +02004659 TRACE_STATE("EH missing, expecting continuation frame", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR, h2c->conn);
Willy Tarreauea18f862018-12-22 20:19:26 +01004660 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4661 /* no more data, the buffer may be full, either due to
4662 * too large a frame or because of too large a hole that
4663 * we're going to compact at the end.
4664 */
4665 goto leave;
4666 }
4667
4668 if (hdr.ft != H2_FT_CONTINUATION) {
4669 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004670 TRACE_STATE("not continuation!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreauea18f862018-12-22 20:19:26 +01004671 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004672 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreauea18f862018-12-22 20:19:26 +01004673 goto fail;
4674 }
4675
4676 if (hdr.sid != h2c->dsi) {
4677 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004678 TRACE_STATE("different stream ID!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreauea18f862018-12-22 20:19:26 +01004679 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004680 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreauea18f862018-12-22 20:19:26 +01004681 goto fail;
4682 }
4683
4684 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4685 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004686 TRACE_STATE("too large frame!", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_HDR|H2_EV_RX_CONT|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreauea18f862018-12-22 20:19:26 +01004687 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4688 goto fail;
4689 }
4690
4691 /* detect when we must stop aggragating frames */
4692 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4693
4694 /* Take as much as we can of the CONTINUATION frame's payload */
4695 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4696 if (clen > hdr.len)
4697 clen = hdr.len;
4698
4699 /* Move the frame's payload over the padding, hole and frame
4700 * header. At least one of hole or dpl is null (see diagrams
4701 * above). The hole moves after the new aggragated frame.
4702 */
4703 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
Christopher Fauletcb1847c2021-04-21 11:11:21 +02004704 h2c->dfl += hdr.len - h2c->dpl;
Willy Tarreauea18f862018-12-22 20:19:26 +01004705 hole += h2c->dpl + 9;
4706 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004707 TRACE_STATE("waiting for next continuation frame", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_RX_CONT|H2_EV_RX_HDR, h2c->conn);
Willy Tarreauea18f862018-12-22 20:19:26 +01004708 goto next_frame;
4709 }
4710
4711 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004712
Willy Tarreau13278b42017-10-13 19:23:14 +02004713 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004714 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004715 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004716 copy = alloc_trash_chunk();
4717 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004718 TRACE_DEVEL("failed to allocate temporary buffer", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR, h2c->conn);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004719 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4720 goto fail;
4721 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004722 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4723 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4724 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004725 }
4726
Willy Tarreau13278b42017-10-13 19:23:14 +02004727 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4728 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004729 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004730 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004731 TRACE_STATE("invalid stream dependency!", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004732 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004733 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004734 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004735 }
4736
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004737 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004738 TRACE_STATE("frame too short for priority!", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004739 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4740 goto fail;
4741 }
4742
Willy Tarreau13278b42017-10-13 19:23:14 +02004743 hdrs += 5; // stream dep = 4, weight = 1
4744 flen -= 5;
4745 }
4746
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004747 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004748 TRACE_STATE("waiting for h2c rxbuf allocation", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau937f7602018-02-26 15:22:17 +01004749 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004750 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004751 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004752
Willy Tarreau937f7602018-02-26 15:22:17 +01004753 /* we can't retry a failed decompression operation so we must be very
4754 * careful not to take any risks. In practice the output buffer is
4755 * always empty except maybe for trailers, in which case we simply have
4756 * to wait for the upper layer to finish consuming what is available.
4757 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004758 htx = htx_from_buf(rxbuf);
4759 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004760 TRACE_STATE("waiting for room in h2c rxbuf", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_BLK, h2c->conn);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004761 h2c->flags |= H2_CF_DEM_SFULL;
4762 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004763 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004764
Willy Tarreau25919232019-01-03 14:48:18 +01004765 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004766 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4767 sizeof(list)/sizeof(list[0]), tmp);
4768 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004769 TRACE_STATE("failed to decompress HPACK", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004770 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4771 goto fail;
4772 }
4773
Willy Tarreau25919232019-01-03 14:48:18 +01004774 /* The PACK decompressor was updated, let's update the input buffer and
4775 * the parser's state to commit these changes and allow us to later
4776 * fail solely on the stream if needed.
4777 */
4778 b_del(&h2c->dbuf, h2c->dfl + hole);
4779 h2c->dfl = hole = 0;
4780 h2c->st0 = H2_CS_FRAME_H;
4781
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004782 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004783 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Christopher Fauletd0db4232021-01-22 11:46:30 +01004784 msgf |= (*flags & H2_SF_BODY_TUNNEL) ? H2_MSGF_BODY_TUNNEL: 0;
Amaury Denoyelle74162742020-12-11 17:53:05 +01004785 /* If an Extended CONNECT has been sent on this stream, set message flag
Ilya Shipitsinacf84592021-02-06 22:29:08 +05004786 * to convert 200 response to 101 htx response */
Amaury Denoyelle74162742020-12-11 17:53:05 +01004787 msgf |= (*flags & H2_SF_EXT_CONNECT_SENT) ? H2_MSGF_EXT_CONNECT: 0;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004788
Willy Tarreau88d138e2019-01-02 19:38:14 +01004789 if (*flags & H2_SF_HEADERS_RCVD)
4790 goto trailers;
4791
4792 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004793 if (h2c->flags & H2_CF_IS_BACK)
Amaury Denoyelle74162742020-12-11 17:53:05 +01004794 outlen = h2_make_htx_response(list, htx, &msgf, body_len, upgrade_protocol);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004795 else
4796 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004797
Christopher Faulet3d875582021-04-26 17:46:13 +02004798 if (outlen < 0 || htx_free_space(htx) < global.tune.maxrewrite) {
Willy Tarreau25919232019-01-03 14:48:18 +01004799 /* too large headers? this is a stream error only */
Christopher Faulet3d875582021-04-26 17:46:13 +02004800 TRACE_STATE("message headers too large", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR|H2_EV_PROTO_ERR, h2c->conn);
4801 htx->flags |= HTX_FL_PARSING_ERROR;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004802 goto fail;
4803 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004804
Willy Tarreau174b06a2018-04-25 18:13:58 +02004805 if (msgf & H2_MSGF_BODY) {
4806 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004807 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004808 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004809 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004810 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004811 }
Christopher Faulet7d247f02020-12-02 14:26:36 +01004812 if (msgf & H2_MSGF_BODYLESS_RSP)
4813 *flags |= H2_SF_BODYLESS_RESP;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004814
Christopher Fauletd0db4232021-01-22 11:46:30 +01004815 if (msgf & H2_MSGF_BODY_TUNNEL)
4816 *flags |= H2_SF_BODY_TUNNEL;
4817 else {
4818 /* Abort the tunnel attempt, if any */
4819 if (*flags & H2_SF_BODY_TUNNEL)
4820 *flags |= H2_SF_TUNNEL_ABRT;
4821 *flags &= ~H2_SF_BODY_TUNNEL;
4822 }
4823
Willy Tarreau88d138e2019-01-02 19:38:14 +01004824 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004825 /* indicate that a HEADERS frame was received for this stream, except
4826 * for 1xx responses. For 1xx responses, another HEADERS frame is
4827 * expected.
4828 */
4829 if (!(msgf & H2_MSGF_RSP_1XX))
4830 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004831
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004832 if (h2c->dff & H2_F_HEADERS_END_STREAM) {
4833 /* no more data are expected for this message */
4834 htx->flags |= HTX_FL_EOM;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004835 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004836
Amaury Denoyelleefe22762020-12-11 17:53:08 +01004837 if (msgf & H2_MSGF_EXT_CONNECT)
4838 *flags |= H2_SF_EXT_CONNECT_RCVD;
4839
Willy Tarreau86277d42019-01-02 15:36:11 +01004840 /* success */
4841 ret = 1;
4842
Willy Tarreau68dd9852017-07-03 14:44:26 +02004843 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004844 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004845 * move the remaining data over it.
4846 */
4847 if (hole) {
4848 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4849 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4850 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4851 b_sub(&h2c->dbuf, hole);
4852 }
4853
Christopher Faulet07f88d72021-04-21 10:39:53 +02004854 if (b_full(&h2c->dbuf) && h2c->dfl) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004855 /* too large frames */
4856 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004857 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004858 }
4859
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004860 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004861 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004862 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004863 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004864 return ret;
4865
Willy Tarreau68dd9852017-07-03 14:44:26 +02004866 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004867 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004868 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004869
4870 trailers:
4871 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004872 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4873 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004874 TRACE_STATE("missing EH on trailers frame", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2C_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004875 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004876 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004877 goto fail;
4878 }
4879
Christopher Faulet9b79a102019-07-15 11:22:56 +02004880 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004881 if (h2_make_htx_trailers(list, htx) <= 0) {
4882 TRACE_STATE("failed to append HTX trailers into rxbuf", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR, h2c->conn);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004883 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004884 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004885 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004886}
4887
Christopher Faulet9b79a102019-07-15 11:22:56 +02004888/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004889 * parser state is automatically updated. Returns > 0 if it could completely
4890 * send the current frame, 0 if it couldn't complete, in which case
4891 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4892 * DATA frame can return 0 as a valid result). Stream errors are reported in
4893 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4894 * have checked the frame header and ensured that the frame was complete or the
4895 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004896 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004897static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004898{
4899 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004900 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004901 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004902 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004903 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004904 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004905
Willy Tarreau7838a792019-08-12 18:42:03 +02004906 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4907
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004908 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004909
Olivier Houchard638b7992018-08-16 15:41:52 +02004910 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004911 if (!csbuf) {
4912 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004913 TRACE_STATE("waiting for an h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004914 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004915 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004916 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004917
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004918try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004919 flen = h2c->dfl - h2c->dpl;
4920 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004921 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004922
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004923 if (flen > b_data(&h2c->dbuf)) {
4924 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004925 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004926 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004927 }
4928
Christopher Faulet9b79a102019-07-15 11:22:56 +02004929 block = htx_free_data_space(htx);
4930 if (!block) {
4931 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004932 TRACE_STATE("h2s rxbuf is full", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004933 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004934 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004935 if (flen > block)
4936 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004937
Christopher Faulet9b79a102019-07-15 11:22:56 +02004938 /* here, flen is the max we can copy into the output buffer */
4939 block = b_contig_data(&h2c->dbuf, 0);
4940 if (flen > block)
4941 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004942
Christopher Faulet9b79a102019-07-15 11:22:56 +02004943 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004944 TRACE_DATA("move some data to h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s, 0, (void *)(long)sent);
Willy Tarreau454f9052017-10-26 19:40:35 +02004945
Christopher Faulet9b79a102019-07-15 11:22:56 +02004946 b_del(&h2c->dbuf, sent);
4947 h2c->dfl -= sent;
4948 h2c->rcvd_c += sent;
4949 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004950
Christopher Faulet9b79a102019-07-15 11:22:56 +02004951 if (h2s->flags & H2_SF_DATA_CLEN) {
4952 h2s->body_len -= sent;
4953 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004954 }
4955
Christopher Faulet9b79a102019-07-15 11:22:56 +02004956 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004957 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004958 TRACE_STATE("h2s rxbuf is full", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004959 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004960 }
4961
Christopher Faulet9b79a102019-07-15 11:22:56 +02004962 goto try_again;
4963
Willy Tarreau4a28da12018-01-04 14:41:00 +01004964 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004965 /* here we're done with the frame, all the payload (except padding) was
4966 * transferred.
4967 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004968
Christopher Faulet5be651d2021-01-22 15:28:03 +01004969 if (!(h2s->flags & H2_SF_BODY_TUNNEL) && (h2c->dff & H2_F_DATA_END_STREAM)) {
4970 /* no more data are expected for this message. This add the EOM
4971 * flag but only on the response path or if no tunnel attempt
4972 * was aborted. Otherwise (request path + tunnel abrted), the
4973 * EOM was already reported.
4974 */
Christopher Faulet33724322021-02-10 09:04:59 +01004975 if ((h2c->flags & H2_CF_IS_BACK) || !(h2s->flags & H2_SF_TUNNEL_ABRT)) {
4976 /* If we receive an empty DATA frame with ES flag while the HTX
4977 * message is empty, we must be sure to push a block to be sure
4978 * the HTX EOM flag will be handled on the other side. It is a
4979 * workaround because for now it is not possible to push empty
4980 * HTX DATA block. And without this block, there is no way to
4981 * "commit" the end of the message.
4982 */
4983 if (htx_is_empty(htx)) {
4984 if (!htx_add_endof(htx, HTX_BLK_EOT))
4985 goto fail;
4986 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004987 htx->flags |= HTX_FL_EOM;
Christopher Faulet33724322021-02-10 09:04:59 +01004988 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004989 }
4990
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004991 h2c->rcvd_c += h2c->dpl;
4992 h2c->rcvd_s += h2c->dpl;
4993 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004994 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004995 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004996 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004997 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004998 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004999 if (htx)
5000 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02005001 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01005002 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02005003}
5004
Willy Tarreau115e83b2018-12-01 19:17:53 +01005005/* Try to send a HEADERS frame matching HTX response present in HTX message
5006 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5007 * must check the stream's status to detect any error which might have happened
5008 * subsequently to a successful send. The htx blocks are automatically removed
5009 * from the message. The htx message is assumed to be valid since produced from
5010 * the internal code, hence it contains a start line, an optional series of
5011 * header blocks and an end of header, otherwise an invalid frame could be
5012 * emitted and the resulting htx message could be left in an inconsistent state.
5013 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005014static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01005015{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005016 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01005017 struct h2c *h2c = h2s->h2c;
5018 struct htx_blk *blk;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005019 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005020 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005021 struct htx_sl *sl;
5022 enum htx_blk_type type;
5023 int es_now = 0;
5024 int ret = 0;
5025 int hdr;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005026
Willy Tarreau7838a792019-08-12 18:42:03 +02005027 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5028
Willy Tarreau115e83b2018-12-01 19:17:53 +01005029 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005030 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005031 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005032 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005033 return 0;
5034 }
5035
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005036 /* get the start line (we do have one) and the rest of the headers,
5037 * that we dump starting at header 0 */
5038 sl = NULL;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005039 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005040 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau115e83b2018-12-01 19:17:53 +01005041 type = htx_get_blk_type(blk);
5042
5043 if (type == HTX_BLK_UNUSED)
5044 continue;
5045
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005046 if (type == HTX_BLK_EOH)
Willy Tarreau115e83b2018-12-01 19:17:53 +01005047 break;
5048
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005049 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01005050 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005051 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5052 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5053 goto fail;
5054 }
5055
5056 list[hdr].n = htx_get_blk_name(htx, blk);
5057 list[hdr].v = htx_get_blk_value(htx, blk);
5058 hdr++;
5059 }
5060 else if (type == HTX_BLK_RES_SL) {
Christopher Faulet56498132021-01-29 11:39:43 +01005061 BUG_ON(sl); /* Only one start-line expected */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005062 sl = htx_get_blk_ptr(htx, blk);
5063 h2s->status = sl->info.res.status;
Christopher Faulet7d247f02020-12-02 14:26:36 +01005064 if (h2s->status == 204 || h2s->status == 304)
5065 h2s->flags |= H2_SF_BODYLESS_RESP;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005066 if (h2s->status < 100 || h2s->status > 999) {
5067 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5068 goto fail;
5069 }
5070 else if (h2s->status == 101) {
Amaury Denoyelleefe22762020-12-11 17:53:08 +01005071 if (unlikely(h2s->flags & H2_SF_EXT_CONNECT_RCVD)) {
5072 /* If an Extended CONNECT has been received, we need to convert 101 to 200 */
5073 h2s->status = 200;
5074 h2s->flags &= ~H2_SF_EXT_CONNECT_RCVD;
5075 }
5076 else {
5077 /* Otherwise, 101 responses are not supported in H2, so return a error (RFC7540#8.1.1) */
5078 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5079 goto fail;
5080 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005081 }
5082 else if ((h2s->flags & H2_SF_BODY_TUNNEL) && h2s->status >= 300) {
5083 /* Abort the tunnel attempt */
5084 h2s->flags &= ~H2_SF_BODY_TUNNEL;
5085 h2s->flags |= H2_SF_TUNNEL_ABRT;
5086 }
5087 }
5088 else {
5089 TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005090 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005091 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005092 }
5093
Christopher Faulet56498132021-01-29 11:39:43 +01005094 /* The start-line me be defined */
5095 BUG_ON(!sl);
5096
Willy Tarreau115e83b2018-12-01 19:17:53 +01005097 /* marker for end of headers */
5098 list[hdr].n = ist("");
5099
Willy Tarreau9c218e72019-05-26 10:08:28 +02005100 mbuf = br_tail(h2c->mbuf);
5101 retry:
5102 if (!h2_get_buf(h2c, mbuf)) {
5103 h2c->flags |= H2_CF_MUX_MALLOC;
5104 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005105 TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau9c218e72019-05-26 10:08:28 +02005106 return 0;
5107 }
5108
Willy Tarreau115e83b2018-12-01 19:17:53 +01005109 chunk_reset(&outbuf);
5110
5111 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005112 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5113 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005114 break;
5115 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005116 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01005117 }
5118
5119 if (outbuf.size < 9)
5120 goto full;
5121
5122 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5123 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5124 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5125 outbuf.data = 9;
5126
5127 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01005128 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005129 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005130 goto realign_again;
5131 goto full;
5132 }
5133
5134 /* encode all headers, stop at empty name */
5135 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
5136 /* these ones do not exist in H2 and must be dropped. */
5137 if (isteq(list[hdr].n, ist("connection")) ||
5138 isteq(list[hdr].n, ist("proxy-connection")) ||
5139 isteq(list[hdr].n, ist("keep-alive")) ||
5140 isteq(list[hdr].n, ist("upgrade")) ||
5141 isteq(list[hdr].n, ist("transfer-encoding")))
5142 continue;
5143
Christopher Faulet86d144c2019-08-14 16:32:25 +02005144 /* Skip all pseudo-headers */
5145 if (*(list[hdr].n.ptr) == ':')
5146 continue;
5147
Willy Tarreau115e83b2018-12-01 19:17:53 +01005148 if (isteq(list[hdr].n, ist("")))
5149 break; // end
5150
5151 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
5152 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005153 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005154 goto realign_again;
5155 goto full;
5156 }
5157 }
5158
Willy Tarreaucb985a42019-10-07 16:56:34 +02005159 /* update the frame's size */
5160 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5161
5162 if (outbuf.data > h2c->mfs + 9) {
5163 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5164 /* output full */
5165 if (b_space_wraps(mbuf))
5166 goto realign_again;
5167 goto full;
5168 }
5169 }
5170
Willy Tarreau38b5bec2021-06-17 08:40:04 +02005171 TRACE_USER("sent H2 response ", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
5172
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005173 /* remove all header blocks including the EOH and compute the
5174 * corresponding size.
Willy Tarreau115e83b2018-12-01 19:17:53 +01005175 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005176 ret = 0;
5177 blk = htx_get_head_blk(htx);
5178 while (blk) {
5179 type = htx_get_blk_type(blk);
5180 ret += htx_get_blksz(blk);
5181 blk = htx_remove_blk(htx, blk);
5182 /* The removed block is the EOH */
5183 if (type == HTX_BLK_EOH)
5184 break;
Christopher Faulet5be651d2021-01-22 15:28:03 +01005185 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005186
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005187 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5188 /* Response already closed: add END_STREAM */
5189 es_now = 1;
5190 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005191 else if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx) && h2s->status >= 200) {
5192 /* EOM+empty: we may need to add END_STREAM except for 1xx
Christopher Faulet991febd2020-12-02 15:17:31 +01005193 * responses and tunneled response.
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005194 */
Christopher Faulet991febd2020-12-02 15:17:31 +01005195 if (!(h2s->flags & H2_SF_BODY_TUNNEL) || h2s->status >= 300)
5196 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005197 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005198
Willy Tarreau115e83b2018-12-01 19:17:53 +01005199 if (es_now)
5200 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5201
5202 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005203 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01005204
5205 /* indicates the HEADERS frame was sent, except for 1xx responses. For
5206 * 1xx responses, another HEADERS frame is expected.
5207 */
Christopher Faulet89899422020-12-07 18:24:43 +01005208 if (h2s->status >= 200)
Christopher Faulet0b465482019-02-19 15:14:23 +01005209 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005210
Willy Tarreau115e83b2018-12-01 19:17:53 +01005211 if (es_now) {
5212 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005213 TRACE_PROTO("setting ES on HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005214 if (h2s->st == H2_SS_OPEN)
5215 h2s->st = H2_SS_HLOC;
5216 else
5217 h2s_close(h2s);
5218 }
5219
5220 /* OK we could properly deliver the response */
Willy Tarreau115e83b2018-12-01 19:17:53 +01005221 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005222 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005223 return ret;
5224 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005225 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5226 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005227 h2c->flags |= H2_CF_MUX_MFULL;
5228 h2s->flags |= H2_SF_BLK_MROOM;
5229 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005230 TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005231 goto end;
5232 fail:
5233 /* unparsable HTX messages, too large ones to be produced in the local
5234 * list etc go here (unrecoverable errors).
5235 */
5236 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5237 ret = 0;
5238 goto end;
5239}
5240
Willy Tarreau80739692018-10-05 11:35:57 +02005241/* Try to send a HEADERS frame matching HTX request present in HTX message
5242 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5243 * must check the stream's status to detect any error which might have happened
5244 * subsequently to a successful send. The htx blocks are automatically removed
5245 * from the message. The htx message is assumed to be valid since produced from
5246 * the internal code, hence it contains a start line, an optional series of
5247 * header blocks and an end of header, otherwise an invalid frame could be
5248 * emitted and the resulting htx message could be left in an inconsistent state.
5249 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005250static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02005251{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005252 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02005253 struct h2c *h2c = h2s->h2c;
5254 struct htx_blk *blk;
Willy Tarreau80739692018-10-05 11:35:57 +02005255 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005256 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02005257 struct htx_sl *sl;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005258 struct ist meth, uri, auth, host = IST_NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005259 enum htx_blk_type type;
5260 int es_now = 0;
5261 int ret = 0;
5262 int hdr;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005263 int extended_connect = 0;
Willy Tarreau80739692018-10-05 11:35:57 +02005264
Willy Tarreau7838a792019-08-12 18:42:03 +02005265 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5266
Willy Tarreau80739692018-10-05 11:35:57 +02005267 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005268 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005269 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005270 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005271 return 0;
5272 }
5273
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005274 /* get the start line (we do have one) and the rest of the headers,
5275 * that we dump starting at header 0 */
5276 sl = NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005277 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005278 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005279 type = htx_get_blk_type(blk);
5280
5281 if (type == HTX_BLK_UNUSED)
5282 continue;
5283
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005284 if (type == HTX_BLK_EOH)
Willy Tarreau80739692018-10-05 11:35:57 +02005285 break;
5286
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005287 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01005288 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005289 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5290 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5291 goto fail;
5292 }
Willy Tarreau80739692018-10-05 11:35:57 +02005293
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005294 list[hdr].n = htx_get_blk_name(htx, blk);
5295 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02005296
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005297 /* Skip header if same name is used to add the server name */
5298 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
5299 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
5300 continue;
Christopher Faulet67d58092019-10-02 10:51:38 +02005301
Ilya Shipitsinacf84592021-02-06 22:29:08 +05005302 /* Convert connection: upgrade to Extended connect from rfc 8441 */
Christopher Faulet673504a2021-09-09 09:52:51 +02005303 if ((sl->flags & HTX_SL_F_CONN_UPG) && isteqi(list[hdr].n, ist("connection"))) {
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005304 /* rfc 7230 #6.1 Connection = list of tokens */
5305 struct ist connection_ist = list[hdr].v;
5306 do {
5307 if (isteqi(iststop(connection_ist, ','),
5308 ist("upgrade"))) {
5309 h2s->flags |= (H2_SF_BODY_TUNNEL|H2_SF_EXT_CONNECT_SENT);
5310 sl->info.req.meth = HTTP_METH_CONNECT;
5311 meth = ist("CONNECT");
5312
5313 extended_connect = 1;
5314 break;
5315 }
5316
5317 connection_ist = istadv(istfind(connection_ist, ','), 1);
5318 } while (istlen(connection_ist));
5319 }
5320
Christopher Faulet673504a2021-09-09 09:52:51 +02005321 if ((sl->flags & HTX_SL_F_CONN_UPG) && isteq(list[hdr].n, ist("upgrade"))) {
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005322 /* rfc 7230 #6.7 Upgrade = list of protocols
5323 * rfc 8441 #4 Extended connect = :protocol is single-valued
5324 *
5325 * only first HTTP/1 protocol is preserved
5326 */
5327 const struct ist protocol = iststop(list[hdr].v, ',');
5328 /* upgrade_protocol field is 16 bytes long in h2s */
5329 istpad(h2s->upgrade_protocol, isttrim(protocol, 15));
5330 }
5331
5332 if (isteq(list[hdr].n, ist("host")))
5333 host = list[hdr].v;
5334
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005335 hdr++;
5336 }
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005337 else if (type == HTX_BLK_REQ_SL) {
5338 BUG_ON(sl); /* Only one start-line expected */
5339 sl = htx_get_blk_ptr(htx, blk);
5340 meth = htx_sl_req_meth(sl);
5341 uri = htx_sl_req_uri(sl);
5342 if (sl->info.req.meth == HTTP_METH_HEAD)
5343 h2s->flags |= H2_SF_BODYLESS_RESP;
5344 if (unlikely(uri.len == 0)) {
5345 TRACE_ERROR("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5346 goto fail;
5347 }
5348 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005349 else {
5350 TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5351 goto fail;
5352 }
Willy Tarreau80739692018-10-05 11:35:57 +02005353 }
5354
Christopher Faulet56498132021-01-29 11:39:43 +01005355 /* The start-line me be defined */
5356 BUG_ON(!sl);
5357
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02005358 /* Now add the server name to a header (if requested) */
5359 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
5360 struct server *srv = objt_server(h2c->conn->target);
5361
5362 if (srv) {
5363 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
5364 list[hdr].v = ist(srv->id);
5365 hdr++;
5366 }
5367 }
5368
Willy Tarreau80739692018-10-05 11:35:57 +02005369 /* marker for end of headers */
5370 list[hdr].n = ist("");
5371
Willy Tarreau9c218e72019-05-26 10:08:28 +02005372 mbuf = br_tail(h2c->mbuf);
5373 retry:
5374 if (!h2_get_buf(h2c, mbuf)) {
5375 h2c->flags |= H2_CF_MUX_MALLOC;
5376 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005377 TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau9c218e72019-05-26 10:08:28 +02005378 return 0;
5379 }
5380
Willy Tarreau80739692018-10-05 11:35:57 +02005381 chunk_reset(&outbuf);
5382
5383 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005384 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5385 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005386 break;
5387 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005388 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02005389 }
5390
5391 if (outbuf.size < 9)
5392 goto full;
5393
5394 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5395 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5396 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5397 outbuf.data = 9;
5398
5399 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005400 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005401 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005402 goto realign_again;
5403 goto full;
5404 }
5405
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005406 auth = ist(NULL);
5407
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005408 /* RFC7540 #8.3: the CONNECT method must have :
5409 * - :authority set to the URI part (host:port)
5410 * - :method set to CONNECT
5411 * - :scheme and :path omitted
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005412 *
5413 * Note that this is not applicable in case of the Extended CONNECT
5414 * protocol from rfc 8441.
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005415 */
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005416 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT) && !extended_connect) {
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005417 auth = uri;
5418
5419 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5420 /* output full */
5421 if (b_space_wraps(mbuf))
5422 goto realign_again;
5423 goto full;
5424 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005425 h2s->flags |= H2_SF_BODY_TUNNEL;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005426 } else {
5427 /* other methods need a :scheme. If an authority is known from
5428 * the request line, it must be sent, otherwise only host is
5429 * sent. Host is never sent as the authority.
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005430 *
5431 * This code is also applicable for Extended CONNECT protocol
5432 * from rfc 8441.
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005433 */
5434 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005435
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005436 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5437 /* the URI seems to start with a scheme */
5438 int len = 1;
5439
5440 while (len < uri.len && uri.ptr[len] != ':')
5441 len++;
5442
5443 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5444 /* make the uri start at the authority now */
Tim Duesterhus9f75ed12021-03-02 18:57:26 +01005445 scheme = ist2(uri.ptr, len);
Tim Duesterhus154374c2021-03-02 18:57:27 +01005446 uri = istadv(uri, len + 3);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005447
5448 /* find the auth part of the URI */
Tim Duesterhus92c696e2021-02-28 16:11:36 +01005449 auth = ist2(uri.ptr, 0);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005450 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5451 auth.len++;
5452
Tim Duesterhus154374c2021-03-02 18:57:27 +01005453 uri = istadv(uri, auth.len);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005454 }
5455 }
5456
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005457 /* For Extended CONNECT, the :authority must be present.
5458 * Use host value for it.
5459 */
5460 if (unlikely(extended_connect) && isttest(host))
5461 auth = host;
5462
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005463 if (!scheme.len) {
5464 /* no explicit scheme, we're using an origin-form URI,
5465 * probably from an H1 request transcoded to H2 via an
5466 * external layer, then received as H2 without authority.
5467 * So we have to look up the scheme from the HTX flags.
5468 * In such a case only http and https are possible, and
5469 * https is the default (sent by browsers).
5470 */
5471 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5472 scheme = ist("http");
5473 else
5474 scheme = ist("https");
5475 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005476
5477 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005478 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005479 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005480 goto realign_again;
5481 goto full;
5482 }
Willy Tarreau80739692018-10-05 11:35:57 +02005483
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005484 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005485 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005486 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005487 goto realign_again;
5488 goto full;
5489 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005490
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005491 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5492 * be sent as '/' or '*'.
5493 */
5494 if (unlikely(!uri.len)) {
5495 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5496 uri = ist("*");
5497 else
5498 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005499 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005500
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005501 if (!hpack_encode_path(&outbuf, uri)) {
5502 /* output full */
5503 if (b_space_wraps(mbuf))
5504 goto realign_again;
5505 goto full;
5506 }
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005507
5508 /* encode the pseudo-header protocol from rfc8441 if using
5509 * Extended CONNECT method.
5510 */
5511 if (unlikely(extended_connect)) {
5512 const struct ist protocol = ist(h2s->upgrade_protocol);
5513 if (isttest(protocol)) {
5514 if (!hpack_encode_header(&outbuf,
5515 ist(":protocol"),
5516 protocol)) {
5517 /* output full */
5518 if (b_space_wraps(mbuf))
5519 goto realign_again;
5520 goto full;
5521 }
5522 }
5523 }
Willy Tarreau80739692018-10-05 11:35:57 +02005524 }
5525
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005526 /* encode all headers, stop at empty name. Host is only sent if we
5527 * do not provide an authority.
5528 */
Willy Tarreau80739692018-10-05 11:35:57 +02005529 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005530 struct ist n = list[hdr].n;
5531 struct ist v = list[hdr].v;
5532
Willy Tarreau80739692018-10-05 11:35:57 +02005533 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005534 if (isteq(n, ist("connection")) ||
5535 (auth.len && isteq(n, ist("host"))) ||
5536 isteq(n, ist("proxy-connection")) ||
5537 isteq(n, ist("keep-alive")) ||
5538 isteq(n, ist("upgrade")) ||
5539 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005540 continue;
5541
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005542 if (isteq(n, ist("te"))) {
5543 /* "te" may only be sent with "trailers" if this value
5544 * is present, otherwise it must be deleted.
5545 */
5546 v = istist(v, ist("trailers"));
Tim Duesterhus7b5777d2021-03-02 18:57:28 +01005547 if (!isttest(v) || (v.len > 8 && v.ptr[8] != ','))
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005548 continue;
5549 v = ist("trailers");
5550 }
5551
Christopher Faulet86d144c2019-08-14 16:32:25 +02005552 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005553 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005554 continue;
5555
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005556 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005557 break; // end
5558
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005559 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005560 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005561 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005562 goto realign_again;
5563 goto full;
5564 }
5565 }
5566
Willy Tarreaucb985a42019-10-07 16:56:34 +02005567 /* update the frame's size */
5568 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5569
5570 if (outbuf.data > h2c->mfs + 9) {
5571 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5572 /* output full */
5573 if (b_space_wraps(mbuf))
5574 goto realign_again;
5575 goto full;
5576 }
5577 }
5578
Willy Tarreau38b5bec2021-06-17 08:40:04 +02005579 TRACE_USER("sent H2 request ", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
5580
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005581 /* remove all header blocks including the EOH and compute the
5582 * corresponding size.
Willy Tarreau80739692018-10-05 11:35:57 +02005583 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005584 ret = 0;
5585 blk = htx_get_head_blk(htx);
5586 while (blk) {
5587 type = htx_get_blk_type(blk);
5588 ret += htx_get_blksz(blk);
5589 blk = htx_remove_blk(htx, blk);
5590 /* The removed block is the EOH */
5591 if (type == HTX_BLK_EOH)
5592 break;
Christopher Fauletd0db4232021-01-22 11:46:30 +01005593 }
Willy Tarreau80739692018-10-05 11:35:57 +02005594
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005595 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5596 /* Request already closed: add END_STREAM */
Willy Tarreau80739692018-10-05 11:35:57 +02005597 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005598 }
5599 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5600 /* EOM+empty: we may need to add END_STREAM (except for CONNECT
5601 * request)
5602 */
5603 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5604 es_now = 1;
5605 }
Willy Tarreau80739692018-10-05 11:35:57 +02005606
Willy Tarreau80739692018-10-05 11:35:57 +02005607 if (es_now)
5608 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5609
5610 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005611 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005612 h2s->flags |= H2_SF_HEADERS_SENT;
5613 h2s->st = H2_SS_OPEN;
5614
Willy Tarreau80739692018-10-05 11:35:57 +02005615 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005616 TRACE_PROTO("setting ES on HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02005617 // trim any possibly pending data (eg: inconsistent content-length)
5618 h2s->flags |= H2_SF_ES_SENT;
5619 h2s->st = H2_SS_HLOC;
5620 }
5621
Willy Tarreau80739692018-10-05 11:35:57 +02005622 end:
5623 return ret;
5624 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005625 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5626 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005627 h2c->flags |= H2_CF_MUX_MFULL;
5628 h2s->flags |= H2_SF_BLK_MROOM;
5629 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005630 TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005631 goto end;
5632 fail:
5633 /* unparsable HTX messages, too large ones to be produced in the local
5634 * list etc go here (unrecoverable errors).
5635 */
5636 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5637 ret = 0;
5638 goto end;
5639}
5640
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005641/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005642 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5643 * caller must check the stream's status to detect any error which might have
5644 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005645 * consumed, or zero if nothing done.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005646 */
Christopher Faulet142854b2020-12-02 15:12:40 +01005647static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005648{
5649 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005650 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005651 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005652 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005653 size_t total = 0;
5654 int es_now = 0;
5655 int bsize; /* htx block size */
5656 int fsize; /* h2 frame size */
5657 struct htx_blk *blk;
5658 enum htx_blk_type type;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005659 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005660
Willy Tarreau7838a792019-08-12 18:42:03 +02005661 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5662
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005663 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005664 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005665 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005666 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005667 goto end;
5668 }
5669
Willy Tarreau98de12a2018-12-12 07:03:00 +01005670 htx = htx_from_buf(buf);
5671
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005672 /* We only come here with HTX_BLK_DATA blocks */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005673
5674 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005675 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005676 goto end;
5677
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005678 if ((h2c->flags & H2_CF_IS_BACK) &&
Christopher Fauletf95f8762021-01-22 11:59:07 +01005679 (h2s->flags & (H2_SF_HEADERS_RCVD|H2_SF_BODY_TUNNEL)) == H2_SF_BODY_TUNNEL) {
5680 /* The response HEADERS frame not received yet. Thus the tunnel
5681 * is not fully established yet. In this situation, we block
5682 * data sending.
5683 */
5684 h2s->flags |= H2_SF_BLK_MBUSY;
5685 TRACE_STATE("Request DATA frame blocked waiting for tunnel establishment", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5686 goto end;
5687 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01005688 else if ((h2c->flags & H2_CF_IS_BACK) && (h2s->flags & H2_SF_TUNNEL_ABRT)) {
5689 /* a tunnel attempt was aborted but the is pending raw data to xfer to the server.
5690 * Thus the stream is closed with the CANCEL error. The error will be reported to
5691 * the upper layer as aserver abort. But at this stage there is nothing more we can
5692 * do. We just wait for the end of the response to be sure to not truncate it.
5693 */
5694 if (!(h2s->flags & H2_SF_ES_RCVD)) {
5695 TRACE_STATE("Request DATA frame blocked waiting end of aborted tunnel", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5696 h2s->flags |= H2_SF_BLK_MBUSY;
5697 }
5698 else {
5699 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
5700 h2s_error(h2s, H2_ERR_CANCEL);
5701 }
5702 goto end;
5703 }
Willy Tarreau98de12a2018-12-12 07:03:00 +01005704
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005705 blk = htx_get_head_blk(htx);
5706 type = htx_get_blk_type(blk);
5707 bsize = htx_get_blksz(blk);
5708 fsize = bsize;
5709 trunc_out = 0;
5710 if (type != HTX_BLK_DATA)
5711 goto end;
5712
Willy Tarreau9c218e72019-05-26 10:08:28 +02005713 mbuf = br_tail(h2c->mbuf);
5714 retry:
5715 if (!h2_get_buf(h2c, mbuf)) {
5716 h2c->flags |= H2_CF_MUX_MALLOC;
5717 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005718 TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau9c218e72019-05-26 10:08:28 +02005719 goto end;
5720 }
5721
Willy Tarreau98de12a2018-12-12 07:03:00 +01005722 /* Perform some optimizations to reduce the number of buffer copies.
5723 * First, if the mux's buffer is empty and the htx area contains
5724 * exactly one data block of the same size as the requested count, and
5725 * this count fits within the frame size, the stream's window size, and
5726 * the connection's window size, then it's possible to simply swap the
5727 * caller's buffer with the mux's output buffer and adjust offsets and
5728 * length to match the entire DATA HTX block in the middle. In this
5729 * case we perform a true zero-copy operation from end-to-end. This is
5730 * the situation that happens all the time with large files. Second, if
5731 * this is not possible, but the mux's output buffer is empty, we still
5732 * have an opportunity to avoid the copy to the intermediary buffer, by
5733 * making the intermediary buffer's area point to the output buffer's
5734 * area. In this case we want to skip the HTX header to make sure that
5735 * copies remain aligned and that this operation remains possible all
5736 * the time. This goes for headers, data blocks and any data extracted
5737 * from the HTX blocks.
5738 */
5739 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005740 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005741 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005742 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005743
Willy Tarreaubcc45952019-05-26 10:05:50 +02005744 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005745 /* Too bad there are data left there. We're willing to memcpy/memmove
5746 * up to 1/4 of the buffer, which means that it's OK to copy a large
5747 * frame into a buffer containing few data if it needs to be realigned,
5748 * and that it's also OK to copy few data without realigning. Otherwise
5749 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005750 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005751 if (fsize + 9 <= b_room(mbuf) &&
5752 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005753 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5754 TRACE_STATE("small data present in output buffer, appending", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005755 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005756 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005757
Willy Tarreau9c218e72019-05-26 10:08:28 +02005758 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5759 goto retry;
5760
Willy Tarreau98de12a2018-12-12 07:03:00 +01005761 h2c->flags |= H2_CF_MUX_MFULL;
5762 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005763 TRACE_STATE("too large data present in output buffer, waiting for emptiness", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005764 goto end;
5765 }
5766
Christopher Faulet925abdf2021-04-27 22:51:07 +02005767 if (htx->flags & HTX_FL_EOM) {
5768 /* EOM+empty: we may need to add END_STREAM (except for tunneled
5769 * message)
5770 */
5771 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5772 es_now = 1;
5773 }
Willy Tarreau98de12a2018-12-12 07:03:00 +01005774 /* map an H2 frame to the HTX block so that we can put the
5775 * frame header there.
5776 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005777 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5778 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005779
5780 /* prepend an H2 DATA frame header just before the DATA block */
5781 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5782 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
Christopher Faulet925abdf2021-04-27 22:51:07 +02005783 if (es_now)
5784 outbuf.area[4] |= H2_F_DATA_END_STREAM;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005785 h2_set_frame_size(outbuf.area, fsize);
5786
5787 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005788 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005789 h2c->mws -= fsize;
5790
5791 /* and exchange with our old area */
5792 buf->area = old_area;
5793 buf->data = buf->head = 0;
5794 total += fsize;
Christopher Faulet925abdf2021-04-27 22:51:07 +02005795 fsize = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005796
5797 TRACE_PROTO("sent H2 DATA frame (zero-copy)", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Christopher Faulet925abdf2021-04-27 22:51:07 +02005798 goto out;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005799 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005800
Willy Tarreau98de12a2018-12-12 07:03:00 +01005801 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005802 /* for DATA and EOM we'll have to emit a frame, even if empty */
5803
5804 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005805 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5806 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005807 break;
5808 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005809 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005810 }
5811
5812 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005813 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5814 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005815 h2c->flags |= H2_CF_MUX_MFULL;
5816 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005817 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005818 goto end;
5819 }
5820
5821 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5822 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5823 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5824 outbuf.data = 9;
5825
5826 /* we have in <fsize> the exact number of bytes we need to copy from
5827 * the HTX buffer. We need to check this against the connection's and
5828 * the stream's send windows, and to ensure that this fits in the max
5829 * frame size and in the buffer's available space minus 9 bytes (for
5830 * the frame header). The connection's flow control is applied last so
5831 * that we can use a separate list of streams which are immediately
5832 * unblocked on window opening. Note: we don't implement padding.
5833 */
5834
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005835 if (!fsize)
5836 goto send_empty;
5837
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005838 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005839 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreau2b718102021-04-21 07:32:39 +02005840 if (LIST_INLIST(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005841 LIST_DEL_INIT(&h2s->list);
Willy Tarreau2b718102021-04-21 07:32:39 +02005842 LIST_APPEND(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005843 TRACE_STATE("stream window <=0, flow-controlled", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2S_FCTL, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005844 goto end;
5845 }
5846
Willy Tarreauee573762018-12-04 15:25:57 +01005847 if (fsize > count)
5848 fsize = count;
5849
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005850 if (fsize > h2s_mws(h2s))
5851 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005852
5853 if (h2c->mfs && fsize > h2c->mfs)
5854 fsize = h2c->mfs; // >0
5855
5856 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005857 /* It doesn't fit at once. If it at least fits once split and
5858 * the amount of data to move is low, let's defragment the
5859 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005860 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005861 if (b_space_wraps(mbuf) &&
5862 (fsize + 9 <= b_room(mbuf)) &&
5863 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005864 goto realign_again;
5865 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005866 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005867
5868 if (fsize <= 0) {
5869 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005870 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5871 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005872 h2c->flags |= H2_CF_MUX_MFULL;
5873 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005874 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005875 goto end;
5876 }
5877 }
5878
5879 if (h2c->mws <= 0) {
5880 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005881 TRACE_STATE("connection window <=0, stream flow-controlled", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_H2C_FCTL, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005882 goto end;
5883 }
5884
5885 if (fsize > h2c->mws)
5886 fsize = h2c->mws;
5887
5888 /* now let's copy this this into the output buffer */
5889 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005890 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005891 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005892 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005893
5894 send_empty:
5895 /* update the frame's size */
5896 h2_set_frame_size(outbuf.area, fsize);
5897
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005898 /* consume incoming HTX block */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005899 total += fsize;
5900 if (fsize == bsize) {
5901 htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005902 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5903 /* EOM+empty: we may need to add END_STREAM (except for tunneled
5904 * message)
5905 */
5906 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5907 es_now = 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02005908 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005909 }
5910 else {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005911 /* we've truncated this block */
5912 htx_cut_data_blk(htx, blk, fsize);
5913 }
5914
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005915 if (es_now)
5916 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5917
5918 /* commit the H2 response */
5919 b_add(mbuf, fsize + 9);
5920
Christopher Faulet925abdf2021-04-27 22:51:07 +02005921 out:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005922 if (es_now) {
5923 if (h2s->st == H2_SS_OPEN)
5924 h2s->st = H2_SS_HLOC;
5925 else
5926 h2s_close(h2s);
5927
5928 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005929 TRACE_PROTO("ES flag set on outgoing frame", H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005930 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005931 else if (fsize) {
5932 if (fsize == bsize) {
5933 TRACE_DEVEL("more data may be available, trying to send another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5934 goto new_frame;
5935 }
5936 else if (trunc_out) {
5937 /* we've truncated this block */
5938 goto new_frame;
5939 }
5940 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005941
5942 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005943 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005944 return total;
5945}
5946
Christopher Faulet991febd2020-12-02 15:17:31 +01005947/* Skip the message payload (DATA blocks) and emit an empty DATA frame with the
5948 * ES flag set for stream <h2s>. This function is called for response known to
5949 * have no payload. Only DATA blocks are skipped. This means the trailers are
Ilya Shipitsinacf84592021-02-06 22:29:08 +05005950 * still emitted. The caller must check the stream's status to detect any error
Christopher Faulet991febd2020-12-02 15:17:31 +01005951 * which might have happened subsequently to a successful send. Returns the
5952 * number of data bytes consumed, or zero if nothing done.
5953 */
5954static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count)
5955{
5956 struct h2c *h2c = h2s->h2c;
5957 struct htx *htx;
5958 int bsize; /* htx block size */
5959 int fsize; /* h2 frame size */
5960 struct htx_blk *blk;
5961 enum htx_blk_type type;
5962 size_t total = 0;
5963
5964 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5965
5966 if (h2c_mux_busy(h2c, h2s)) {
5967 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5968 h2s->flags |= H2_SF_BLK_MBUSY;
5969 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5970 goto end;
5971 }
5972
5973 htx = htx_from_buf(buf);
5974
5975 next_data:
5976 if (!count || htx_is_empty(htx))
5977 goto end;
5978 blk = htx_get_head_blk(htx);
5979 type = htx_get_blk_type(blk);
5980 bsize = htx_get_blksz(blk);
5981 fsize = bsize;
5982 if (type != HTX_BLK_DATA)
5983 goto end;
5984
5985 if (fsize > count)
5986 fsize = count;
5987
5988 if (fsize != bsize)
5989 goto skip_data;
5990
5991 if (!(htx->flags & HTX_FL_EOM) || !htx_is_unique_blk(htx, blk))
5992 goto skip_data;
5993
5994 /* Here, it is the last block and it is also the end of the message. So
5995 * we can emit an empty DATA frame with the ES flag set
5996 */
5997 if (h2_send_empty_data_es(h2s) <= 0)
5998 goto end;
5999
6000 if (h2s->st == H2_SS_OPEN)
6001 h2s->st = H2_SS_HLOC;
6002 else
6003 h2s_close(h2s);
6004
6005 skip_data:
6006 /* consume incoming HTX block */
6007 total += fsize;
6008 if (fsize == bsize) {
6009 TRACE_DEVEL("more data may be available, trying to skip another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
6010 htx_remove_blk(htx, blk);
6011 goto next_data;
6012 }
6013 else {
6014 /* we've truncated this block */
6015 htx_cut_data_blk(htx, blk, fsize);
6016 }
6017
6018 end:
6019 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
6020 return total;
6021}
6022
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006023/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
6024 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
6025 * processed. The caller must check the stream's status to detect any error
6026 * which might have happened subsequently to a successful send. The htx blocks
6027 * are automatically removed from the message. The htx message is assumed to be
6028 * valid since produced from the internal code. Processing stops when meeting
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006029 * the EOT, which *is* removed. All trailers are processed at once and sent as a
6030 * single frame. The ES flag is always set.
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006031 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006032static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006033{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02006034 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006035 struct h2c *h2c = h2s->h2c;
6036 struct htx_blk *blk;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006037 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02006038 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006039 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006040 int ret = 0;
6041 int hdr;
6042 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006043
Willy Tarreau7838a792019-08-12 18:42:03 +02006044 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
6045
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006046 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006047 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006048 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02006049 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006050 goto end;
6051 }
6052
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006053 /* get trailers. */
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006054 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006055 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006056 type = htx_get_blk_type(blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006057
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006058 if (type == HTX_BLK_UNUSED)
6059 continue;
6060
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006061 if (type == HTX_BLK_EOT)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006062 break;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006063 if (type == HTX_BLK_TLR) {
6064 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
6065 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
6066 goto fail;
6067 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006068
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006069 list[hdr].n = htx_get_blk_name(htx, blk);
6070 list[hdr].v = htx_get_blk_value(htx, blk);
6071 hdr++;
6072 }
6073 else {
6074 TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006075 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02006076 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006077 }
6078
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006079 /* marker for end of trailers */
6080 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006081
Willy Tarreau9c218e72019-05-26 10:08:28 +02006082 mbuf = br_tail(h2c->mbuf);
6083 retry:
6084 if (!h2_get_buf(h2c, mbuf)) {
6085 h2c->flags |= H2_CF_MUX_MALLOC;
6086 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02006087 TRACE_STATE("waiting for room in output buffer", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau9c218e72019-05-26 10:08:28 +02006088 goto end;
6089 }
6090
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006091 chunk_reset(&outbuf);
6092
6093 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02006094 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
6095 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006096 break;
6097 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02006098 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006099 }
6100
6101 if (outbuf.size < 9)
6102 goto full;
6103
6104 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
6105 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
6106 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
6107 outbuf.data = 9;
6108
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006109 /* encode all headers */
6110 for (idx = 0; idx < hdr; idx++) {
6111 /* these ones do not exist in H2 or must not appear in
6112 * trailers and must be dropped.
6113 */
6114 if (isteq(list[idx].n, ist("host")) ||
6115 isteq(list[idx].n, ist("content-length")) ||
6116 isteq(list[idx].n, ist("connection")) ||
6117 isteq(list[idx].n, ist("proxy-connection")) ||
6118 isteq(list[idx].n, ist("keep-alive")) ||
6119 isteq(list[idx].n, ist("upgrade")) ||
6120 isteq(list[idx].n, ist("te")) ||
6121 isteq(list[idx].n, ist("transfer-encoding")))
6122 continue;
6123
Christopher Faulet86d144c2019-08-14 16:32:25 +02006124 /* Skip all pseudo-headers */
6125 if (*(list[idx].n.ptr) == ':')
6126 continue;
6127
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006128 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
6129 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02006130 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006131 goto realign_again;
6132 goto full;
6133 }
6134 }
6135
Willy Tarreau5121e5d2019-05-06 15:13:41 +02006136 if (outbuf.data == 9) {
6137 /* here we have a problem, we have nothing to emit (either we
6138 * received an empty trailers block followed or we removed its
6139 * contents above). Because of this we can't send a HEADERS
6140 * frame, so we have to cheat and instead send an empty DATA
6141 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01006142 */
6143 outbuf.area[3] = H2_FT_DATA;
6144 outbuf.area[4] = H2_F_DATA_END_STREAM;
6145 }
6146
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006147 /* update the frame's size */
6148 h2_set_frame_size(outbuf.area, outbuf.data - 9);
6149
Willy Tarreau572d9f52019-10-11 16:58:37 +02006150 if (outbuf.data > h2c->mfs + 9) {
6151 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
6152 /* output full */
6153 if (b_space_wraps(mbuf))
6154 goto realign_again;
6155 goto full;
6156 }
6157 }
6158
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006159 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02006160 TRACE_PROTO("sent H2 trailers HEADERS frame", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006161 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006162 h2s->flags |= H2_SF_ES_SENT;
6163
6164 if (h2s->st == H2_SS_OPEN)
6165 h2s->st = H2_SS_HLOC;
6166 else
6167 h2s_close(h2s);
6168
6169 /* OK we could properly deliver the response */
6170 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02006171 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006172 ret = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006173 blk = htx_get_head_blk(htx);
6174 while (blk) {
6175 type = htx_get_blk_type(blk);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006176 ret += htx_get_blksz(blk);
6177 blk = htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006178 /* The removed block is the EOT */
6179 if (type == HTX_BLK_EOT)
6180 break;
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006181 }
6182
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006183 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02006184 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006185 return ret;
6186 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02006187 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
6188 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006189 h2c->flags |= H2_CF_MUX_MFULL;
6190 h2s->flags |= H2_SF_BLK_MROOM;
6191 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006192 TRACE_STATE("mux buffer full", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006193 goto end;
6194 fail:
6195 /* unparsable HTX messages, too large ones to be produced in the local
6196 * list etc go here (unrecoverable errors).
6197 */
6198 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
6199 ret = 0;
6200 goto end;
6201}
6202
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006203/* Called from the upper layer, to subscribe <es> to events <event_type>. The
6204 * event subscriber <es> is not allowed to change from a previous call as long
6205 * as at least one event is still subscribed. The <event_type> must only be a
6206 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006207 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006208static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02006209{
Olivier Houchard6ff20392018-07-17 18:46:31 +02006210 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02006211 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006212
Willy Tarreau7838a792019-08-12 18:42:03 +02006213 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006214
6215 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006216 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006217
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006218 es->events |= event_type;
6219 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006220
6221 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006222 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006223
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006224 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006225 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02006226 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
Willy Tarreau2b718102021-04-21 07:32:39 +02006227 !LIST_INLIST(&h2s->list)) {
Olivier Houchardf8338152019-05-14 17:50:32 +02006228 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02006229 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Olivier Houchardf8338152019-05-14 17:50:32 +02006230 else
Willy Tarreau2b718102021-04-21 07:32:39 +02006231 LIST_APPEND(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02006232 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02006233 }
Willy Tarreau7838a792019-08-12 18:42:03 +02006234 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006235 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006236}
6237
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006238/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
6239 * The <es> pointer is not allowed to differ from the one passed to the
6240 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006241 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006242static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006243{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006244 struct h2s *h2s = cs->ctx;
6245
Willy Tarreau7838a792019-08-12 18:42:03 +02006246 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006247
6248 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006249 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006250
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006251 es->events &= ~event_type;
6252 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01006253 h2s->subs = NULL;
6254
6255 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006256 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006257
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006258 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006259 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006260 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006261 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
6262 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02006263 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01006264
Willy Tarreau7838a792019-08-12 18:42:03 +02006265 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006266 return 0;
6267}
6268
6269
Christopher Faulet93a466b2021-09-21 15:50:55 +02006270/* Called from the upper layer, to receive data
6271 *
6272 * The caller is responsible for defragmenting <buf> if necessary. But <flags>
6273 * must be tested to know the calling context. If CO_RFL_BUF_FLUSH is set, it
6274 * means the caller wants to flush input data (from the mux buffer and the
6275 * channel buffer) to be able to use kernel splicing or any kind of mux-to-mux
6276 * xfer. If CO_RFL_KEEP_RECV is set, the mux must always subscribe for read
6277 * events before giving back. CO_RFL_BUF_WET is set if <buf> is congested with
6278 * data scheduled for leaving soon. CO_RFL_BUF_NOT_STUCK is set to instruct the
6279 * mux it may optimize the data copy to <buf> if necessary. Otherwise, it should
6280 * copy as much data as possible.
6281 */
Olivier Houchard511efea2018-08-16 15:30:32 +02006282static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
6283{
Olivier Houchard638b7992018-08-16 15:41:52 +02006284 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01006285 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01006286 struct htx *h2s_htx = NULL;
6287 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02006288 size_t ret = 0;
6289
Willy Tarreau7838a792019-08-12 18:42:03 +02006290 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
6291
Olivier Houchard511efea2018-08-16 15:30:32 +02006292 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006293 h2s_htx = htx_from_buf(&h2s->rxbuf);
6294 if (htx_is_empty(h2s_htx)) {
6295 /* Here htx_to_buf() will set buffer data to 0 because
6296 * the HTX is empty.
6297 */
6298 htx_to_buf(h2s_htx, &h2s->rxbuf);
6299 goto end;
6300 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01006301
Christopher Faulet9b79a102019-07-15 11:22:56 +02006302 ret = h2s_htx->data;
6303 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01006304
Christopher Faulet9b79a102019-07-15 11:22:56 +02006305 /* <buf> is empty and the message is small enough, swap the
6306 * buffers. */
6307 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01006308 htx_to_buf(buf_htx, buf);
6309 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006310 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
6311 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01006312 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02006313
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006314 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_UNUSED);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006315
6316 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
6317 buf_htx->flags |= HTX_FL_PARSING_ERROR;
6318 if (htx_is_empty(buf_htx))
6319 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01006320 }
Christopher Faulet810df062020-07-22 16:20:34 +02006321 else if (htx_is_empty(h2s_htx))
Christopher Faulet42432f32020-11-20 17:43:16 +01006322 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006323
Christopher Faulet9b79a102019-07-15 11:22:56 +02006324 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
6325 htx_to_buf(buf_htx, buf);
6326 htx_to_buf(h2s_htx, &h2s->rxbuf);
6327 ret -= h2s_htx->data;
6328
Christopher Faulet37070b22019-02-14 15:12:14 +01006329 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02006330 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01006331 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006332 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01006333 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletd0db4232021-01-22 11:46:30 +01006334 if (h2s->flags & H2_SF_ES_RCVD) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02006335 cs->flags |= CS_FL_EOI;
Christopher Fauletd0db4232021-01-22 11:46:30 +01006336 /* Add EOS flag for tunnel */
6337 if (h2s->flags & H2_SF_BODY_TUNNEL)
6338 cs->flags |= CS_FL_EOS;
6339 }
Christopher Fauletaade4ed2020-10-08 15:38:41 +02006340 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02006341 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01006342 if (cs->flags & CS_FL_ERR_PENDING)
6343 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02006344 if (b_size(&h2s->rxbuf)) {
6345 b_free(&h2s->rxbuf);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01006346 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02006347 }
Olivier Houchard511efea2018-08-16 15:30:32 +02006348 }
6349
Willy Tarreau082f5592018-11-25 08:03:32 +01006350 if (ret && h2c->dsi == h2s->id) {
6351 /* demux is blocking on this stream's buffer */
6352 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02006353 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01006354 }
Christopher Faulet37070b22019-02-14 15:12:14 +01006355
Willy Tarreau7838a792019-08-12 18:42:03 +02006356 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02006357 return ret;
6358}
6359
Olivier Houchardd846c262018-10-19 17:24:29 +02006360
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006361/* Called from the upper layer, to send data from buffer <buf> for no more than
6362 * <count> bytes. Returns the number of bytes effectively sent. Some status
6363 * flags may be updated on the conn_stream.
6364 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02006365static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02006366{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006367 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02006368 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02006369 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006370 struct htx *htx;
6371 struct htx_blk *blk;
6372 enum htx_blk_type btype;
6373 uint32_t bsize;
6374 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006375
Willy Tarreau7838a792019-08-12 18:42:03 +02006376 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
6377
Olivier Houchardd360ac62019-03-22 17:37:16 +01006378 /* If we were not just woken because we wanted to send but couldn't,
6379 * and there's somebody else that is waiting to send, do nothing,
6380 * we will subscribe later and be put at the end of the list
6381 */
Willy Tarreaud9464162020-01-10 18:25:07 +01006382 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02006383 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
6384 TRACE_DEVEL("other streams already waiting, going to the queue and leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s);
Olivier Houchardd360ac62019-03-22 17:37:16 +01006385 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006386 }
Willy Tarreaud9464162020-01-10 18:25:07 +01006387 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02006388
Willy Tarreau7838a792019-08-12 18:42:03 +02006389 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
6390 TRACE_DEVEL("connection not ready, leaving", H2_EV_H2S_SEND|H2_EV_H2S_BLK, h2s->h2c->conn, h2s);
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006391 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006392 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006393
Willy Tarreaucab22952019-10-31 15:48:18 +01006394 if (h2s->h2c->st0 >= H2_CS_ERROR) {
6395 cs->flags |= CS_FL_ERROR;
6396 TRACE_DEVEL("connection is in error, leaving in error", H2_EV_H2S_SEND|H2_EV_H2S_BLK|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s);
6397 return 0;
6398 }
6399
Christopher Faulet9b79a102019-07-15 11:22:56 +02006400 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006401
Willy Tarreau0bad0432018-06-14 16:54:01 +02006402 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01006403 h2s->flags |= H2_SF_OUTGOING_DATA;
6404
Willy Tarreau751f2d02018-10-05 09:35:00 +02006405 if (h2s->id == 0) {
6406 int32_t id = h2c_get_next_sid(h2s->h2c);
6407
6408 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02006409 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02006410 TRACE_DEVEL("couldn't get a stream ID, leaving in error", H2_EV_H2S_SEND|H2_EV_H2S_BLK|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02006411 return 0;
6412 }
6413
6414 eb32_delete(&h2s->by_id);
6415 h2s->by_id.key = h2s->id = id;
6416 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01006417 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02006418 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
6419 }
6420
Christopher Faulet9b79a102019-07-15 11:22:56 +02006421 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
6422 count && !htx_is_empty(htx)) {
6423 idx = htx_get_head(htx);
6424 blk = htx_get_blk(htx, idx);
6425 btype = htx_get_blk_type(blk);
6426 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006427
Christopher Faulet9b79a102019-07-15 11:22:56 +02006428 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02006429 case HTX_BLK_REQ_SL:
6430 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006431 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02006432 if (ret > 0) {
6433 total += ret;
6434 count -= ret;
6435 if (ret < bsize)
6436 goto done;
6437 }
6438 break;
6439
Willy Tarreau115e83b2018-12-01 19:17:53 +01006440 case HTX_BLK_RES_SL:
6441 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006442 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01006443 if (ret > 0) {
6444 total += ret;
6445 count -= ret;
6446 if (ret < bsize)
6447 goto done;
6448 }
6449 break;
6450
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006451 case HTX_BLK_DATA:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006452 /* all these cause the emission of a DATA frame (possibly empty) */
Christopher Faulet991febd2020-12-02 15:17:31 +01006453 if (!(h2s->h2c->flags & H2_CF_IS_BACK) &&
6454 (h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BODYLESS_RESP)) == H2_SF_BODYLESS_RESP)
6455 ret = h2s_skip_data(h2s, buf, count);
6456 else
6457 ret = h2s_make_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006458 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01006459 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006460 total += ret;
6461 count -= ret;
6462 if (ret < bsize)
6463 goto done;
6464 }
6465 break;
6466
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006467 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006468 case HTX_BLK_EOT:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006469 /* This is the first trailers block, all the subsequent ones */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006470 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006471 if (ret > 0) {
6472 total += ret;
6473 count -= ret;
6474 if (ret < bsize)
6475 goto done;
6476 }
6477 break;
6478
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006479 default:
6480 htx_remove_blk(htx, blk);
6481 total += bsize;
6482 count -= bsize;
6483 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006484 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006485 }
6486
Christopher Faulet9b79a102019-07-15 11:22:56 +02006487 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02006488 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02006489 /* trim any possibly pending data after we close (extra CR-LF,
6490 * unprocessed trailers, abnormal extra data, ...)
6491 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02006492 total += count;
6493 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02006494 }
6495
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006496 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01006497 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006498 TRACE_DEVEL("reporting RST/error to the app-layer stream", H2_EV_H2S_SEND|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s);
Willy Tarreauec988c72018-12-19 18:00:29 +01006499 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01006500 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01006501 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006502 }
6503
Christopher Faulet9b79a102019-07-15 11:22:56 +02006504 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02006505
Olivier Houchard7505f942018-08-21 18:10:44 +02006506 if (total > 0) {
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006507 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006508 TRACE_DEVEL("data queued, waking up h2c sender", H2_EV_H2S_SEND|H2_EV_H2C_SEND, h2s->h2c->conn, h2s);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02006509 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006510 }
Olivier Houchardd846c262018-10-19 17:24:29 +02006511
Olivier Houchard7505f942018-08-21 18:10:44 +02006512 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006513 /* If we're waiting for flow control, and we got a shutr on the
6514 * connection, we will never be unlocked, so add an error on
6515 * the conn_stream.
6516 */
6517 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
6518 !b_data(&h2s->h2c->dbuf) &&
6519 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006520 TRACE_DEVEL("fctl with shutr, reporting error to app-layer", H2_EV_H2S_SEND|H2_EV_STRM_SEND|H2_EV_STRM_ERR, h2s->h2c->conn, h2s);
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006521 if (cs->flags & CS_FL_EOS)
6522 cs->flags |= CS_FL_ERROR;
6523 else
6524 cs->flags |= CS_FL_ERR_PENDING;
6525 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006526
Willy Tarreau5723f292020-01-10 15:16:57 +01006527 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6528 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006529 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006530 LIST_DEL_INIT(&h2s->list);
6531 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006532
Willy Tarreau7838a792019-08-12 18:42:03 +02006533 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006534 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006535}
6536
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006537/* for debugging with CLI's "show fd" command */
Willy Tarreau8050efe2021-01-21 08:26:06 +01006538static int h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006539{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006540 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006541 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006542 struct eb32_node *node;
6543 int fctl_cnt = 0;
6544 int send_cnt = 0;
6545 int tree_cnt = 0;
6546 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006547 struct buffer *hmbuf, *tmbuf;
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006548 int ret = 0;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006549
6550 if (!h2c)
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006551 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006552
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006553 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006554 fctl_cnt++;
6555
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006556 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006557 send_cnt++;
6558
Willy Tarreau3af37712018-12-18 14:34:41 +01006559 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006560 node = eb32_first(&h2c->streams_by_id);
6561 while (node) {
6562 h2s = container_of(node, struct h2s, by_id);
6563 tree_cnt++;
6564 if (!h2s->cs)
6565 orph_cnt++;
6566 node = eb32_next(node);
6567 }
6568
Willy Tarreau60f62682019-05-26 11:32:27 +02006569 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006570 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006571 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006572 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006573 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6574 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006575 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006576 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006577 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006578 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6579 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6580 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006581 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6582 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6583 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006584 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6585 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006586
6587 if (h2s) {
Willy Tarreaued4464e2021-01-20 15:50:03 +01006588 chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s .flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006589 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006590 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6591 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6592 h2s->cs);
6593 if (h2s->cs)
Willy Tarreau98e40b92021-01-20 16:27:01 +01006594 chunk_appendf(msg, "(.flg=0x%08x .data=%p)",
Willy Tarreau987c0632018-12-18 10:32:05 +01006595 h2s->cs->flags, h2s->cs->data);
Willy Tarreau98e40b92021-01-20 16:27:01 +01006596
6597 chunk_appendf(&trash, " .subs=%p", h2s->subs);
6598 if (h2s->subs) {
Christopher Faulet6c93c4e2021-02-25 10:06:29 +01006599 chunk_appendf(&trash, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet);
6600 chunk_appendf(&trash, " tl.calls=%d tl.ctx=%p tl.fct=",
6601 h2s->subs->tasklet->calls,
6602 h2s->subs->tasklet->context);
6603 if (h2s->subs->tasklet->calls >= 1000000)
6604 ret = 1;
6605 resolve_sym_name(&trash, NULL, h2s->subs->tasklet->process);
6606 chunk_appendf(&trash, ")");
Willy Tarreau98e40b92021-01-20 16:27:01 +01006607 }
Willy Tarreau987c0632018-12-18 10:32:05 +01006608 }
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006609 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006610}
Willy Tarreau62f52692017-10-08 23:01:42 +02006611
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006612/* Migrate the the connection to the current thread.
6613 * Return 0 if successful, non-zero otherwise.
6614 * Expected to be called with the old thread lock held.
6615 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006616static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006617{
6618 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006619 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006620
6621 if (fd_takeover(conn->handle.fd, conn) != 0)
6622 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006623
6624 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6625 /* We failed to takeover the xprt, even if the connection may
6626 * still be valid, flag it as error'd, as we have already
6627 * taken over the fd, and wake the tasklet, so that it will
6628 * destroy it.
6629 */
6630 conn->flags |= CO_FL_ERROR;
6631 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6632 return -1;
6633 }
6634
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006635 if (h2c->wait_event.events)
6636 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6637 h2c->wait_event.events, &h2c->wait_event);
6638 /* To let the tasklet know it should free itself, and do nothing else,
6639 * set its context to NULL.
6640 */
6641 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006642 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006643
6644 task = h2c->task;
6645 if (task) {
6646 task->context = NULL;
6647 h2c->task = NULL;
6648 __ha_barrier_store();
6649 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006650
6651 h2c->task = task_new(tid_bit);
6652 if (!h2c->task) {
6653 h2_release(h2c);
6654 return -1;
6655 }
6656 h2c->task->process = h2_timeout_task;
6657 h2c->task->context = h2c;
6658 }
6659 h2c->wait_event.tasklet = tasklet_new();
6660 if (!h2c->wait_event.tasklet) {
6661 h2_release(h2c);
6662 return -1;
6663 }
6664 h2c->wait_event.tasklet->process = h2_io_cb;
6665 h2c->wait_event.tasklet->context = h2c;
6666 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6667 SUB_RETRY_RECV, &h2c->wait_event);
6668
6669 return 0;
6670}
6671
Willy Tarreau62f52692017-10-08 23:01:42 +02006672/*******************************************************/
6673/* functions below are dedicated to the config parsers */
6674/*******************************************************/
6675
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006676/* config parser for global "tune.h2.header-table-size" */
6677static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006678 const struct proxy *defpx, const char *file, int line,
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006679 char **err)
6680{
6681 if (too_many_args(1, args, err, NULL))
6682 return -1;
6683
6684 h2_settings_header_table_size = atoi(args[1]);
6685 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6686 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6687 return -1;
6688 }
6689 return 0;
6690}
Willy Tarreau62f52692017-10-08 23:01:42 +02006691
Willy Tarreaue6baec02017-07-27 11:45:11 +02006692/* config parser for global "tune.h2.initial-window-size" */
6693static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006694 const struct proxy *defpx, const char *file, int line,
Willy Tarreaue6baec02017-07-27 11:45:11 +02006695 char **err)
6696{
6697 if (too_many_args(1, args, err, NULL))
6698 return -1;
6699
6700 h2_settings_initial_window_size = atoi(args[1]);
6701 if (h2_settings_initial_window_size < 0) {
6702 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6703 return -1;
6704 }
6705 return 0;
6706}
6707
Willy Tarreau5242ef82017-07-27 11:47:28 +02006708/* config parser for global "tune.h2.max-concurrent-streams" */
6709static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006710 const struct proxy *defpx, const char *file, int line,
Willy Tarreau5242ef82017-07-27 11:47:28 +02006711 char **err)
6712{
6713 if (too_many_args(1, args, err, NULL))
6714 return -1;
6715
6716 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006717 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006718 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6719 return -1;
6720 }
6721 return 0;
6722}
6723
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006724/* config parser for global "tune.h2.max-frame-size" */
6725static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006726 const struct proxy *defpx, const char *file, int line,
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006727 char **err)
6728{
6729 if (too_many_args(1, args, err, NULL))
6730 return -1;
6731
6732 h2_settings_max_frame_size = atoi(args[1]);
6733 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6734 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6735 return -1;
6736 }
6737 return 0;
6738}
6739
Willy Tarreau62f52692017-10-08 23:01:42 +02006740
6741/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006742/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006743/***************************************/
6744
6745/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006746static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006747 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006748 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006749 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006750 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006751 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006752 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006753 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006754 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006755 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006756 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006757 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006758 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006759 .shutr = h2_shutr,
6760 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006761 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006762 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006763 .takeover = h2_takeover,
Christopher Fauleta4600572021-03-08 15:28:28 +01006764 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK|MX_FL_NO_UPG,
Willy Tarreau62f52692017-10-08 23:01:42 +02006765 .name = "H2",
6766};
6767
Christopher Faulet32f61c02018-04-10 14:33:41 +02006768static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006769 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006770
Willy Tarreau0108d902018-11-25 19:14:37 +01006771INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6772
Willy Tarreau62f52692017-10-08 23:01:42 +02006773/* config keyword parsers */
6774static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006775 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006776 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006777 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006778 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006779 { 0, NULL, NULL }
6780}};
6781
Willy Tarreau0108d902018-11-25 19:14:37 +01006782INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006783
6784/* initialize internal structs after the config is parsed.
6785 * Returns zero on success, non-zero on error.
6786 */
6787static int init_h2()
6788{
6789 pool_head_hpack_tbl = create_pool("hpack_tbl",
6790 h2_settings_header_table_size,
6791 MEM_F_SHARED|MEM_F_EXACT);
Christopher Faulet52140992020-11-06 15:23:39 +01006792 if (!pool_head_hpack_tbl) {
6793 ha_alert("failed to allocate hpack_tbl memory pool\n");
6794 return (ERR_ALERT | ERR_FATAL);
6795 }
6796 return ERR_NONE;
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006797}
6798
6799REGISTER_POST_CHECK(init_h2);