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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
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020061
Willy Tarreau081d4722017-05-16 21:51:05 +020062/* other flags */
Willy Tarreauf2101912018-07-19 10:11:38 +020063#define H2_CF_GOAWAY_SENT 0x00001000 // a GOAWAY frame was successfully sent
64#define H2_CF_GOAWAY_FAILED 0x00002000 // a GOAWAY frame failed to be sent
65#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 +020066#define H2_CF_IS_BACK 0x00008000 // this is an outgoing connection
Willy Tarreau3d4631f2021-01-20 10:53:13 +010067#define H2_CF_WINDOW_OPENED 0x00010000 // demux increased window already advertised
68#define H2_CF_RCVD_SHUT 0x00020000 // a recv() attempt already failed on a shutdown
69#define H2_CF_END_REACHED 0x00040000 // pending data too short with RCVD_SHUT present
Willy Tarreau081d4722017-05-16 21:51:05 +020070
Willy Tarreau5ab6b572017-09-22 08:05:00 +020071/* H2 connection state, in h2c->st0 */
72enum h2_cs {
73 H2_CS_PREFACE, // init done, waiting for connection preface
74 H2_CS_SETTINGS1, // preface OK, waiting for first settings frame
75 H2_CS_FRAME_H, // first settings frame ok, waiting for frame header
76 H2_CS_FRAME_P, // frame header OK, waiting for frame payload
Willy Tarreaua20a5192017-12-27 11:02:06 +010077 H2_CS_FRAME_A, // frame payload OK, trying to send ACK frame
78 H2_CS_FRAME_E, // frame payload OK, trying to send RST frame
Willy Tarreau5ab6b572017-09-22 08:05:00 +020079 H2_CS_ERROR, // send GOAWAY(errcode) and close the connection ASAP
80 H2_CS_ERROR2, // GOAWAY(errcode) sent, close the connection ASAP
81 H2_CS_ENTRIES // must be last
82} __attribute__((packed));
83
Willy Tarreau51330962019-05-26 09:38:07 +020084
Willy Tarreau9c218e72019-05-26 10:08:28 +020085/* 32 buffers: one for the ring's root, rest for the mbuf itself */
86#define H2C_MBUF_CNT 32
Willy Tarreau51330962019-05-26 09:38:07 +020087
Willy Tarreau5ab6b572017-09-22 08:05:00 +020088/* H2 connection descriptor */
89struct h2c {
90 struct connection *conn;
91
92 enum h2_cs st0; /* mux state */
93 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
94
95 /* 16 bit hole here */
96 uint32_t flags; /* connection flags: H2_CF_* */
Willy Tarreau2e2083a2019-01-31 10:34:07 +010097 uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
Willy Tarreau5ab6b572017-09-22 08:05:00 +020098 int32_t max_id; /* highest ID known on this connection, <0 before preface */
99 uint32_t rcvd_c; /* newly received data to ACK for the connection */
100 uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) */
101
102 /* states for the demux direction */
103 struct hpack_dht *ddht; /* demux dynamic header table */
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200104 struct buffer dbuf; /* demux buffer */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200105
106 int32_t dsi; /* demux stream ID (<0 = idle) */
107 int32_t dfl; /* demux frame length (if dsi >= 0) */
108 int8_t dft; /* demux frame type (if dsi >= 0) */
109 int8_t dff; /* demux frame flags (if dsi >= 0) */
Willy Tarreau05e5daf2017-12-11 15:17:36 +0100110 uint8_t dpl; /* demux pad length (part of dfl), init to 0 */
111 /* 8 bit hole here */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200112 int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */
113
114 /* states for the mux direction */
Willy Tarreau51330962019-05-26 09:38:07 +0200115 struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200116 int32_t msi; /* mux stream ID (<0 = idle) */
117 int32_t mfl; /* mux frame length (if dsi >= 0) */
118 int8_t mft; /* mux frame type (if dsi >= 0) */
119 int8_t mff; /* mux frame flags (if dsi >= 0) */
120 /* 16 bit hole here */
121 int32_t miw; /* mux initial window size for all new streams */
122 int32_t mws; /* mux window size. Can be negative. */
123 int32_t mfs; /* mux's max frame size */
124
Willy Tarreauea392822017-10-31 10:02:25 +0100125 int timeout; /* idle timeout duration in ticks */
Willy Tarreau599391a2017-11-24 10:16:00 +0100126 int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */
Willy Tarreau49745612017-12-03 18:56:02 +0100127 unsigned int nb_streams; /* number of streams in the tree */
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200128 unsigned int nb_cs; /* number of attached conn_streams */
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100129 unsigned int nb_reserved; /* number of reserved streams */
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100130 unsigned int stream_cnt; /* total number of streams seen */
Willy Tarreau0b37d652018-10-03 10:33:02 +0200131 struct proxy *proxy; /* the proxy this connection was created for */
Willy Tarreauea392822017-10-31 10:02:25 +0100132 struct task *task; /* timeout management task */
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100133 struct h2_counters *px_counters; /* h2 counters attached to proxy */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200134 struct eb_root streams_by_id; /* all active streams by their ID */
135 struct list send_list; /* list of blocked streams requesting to send */
136 struct list fctl_list; /* list of streams blocked by connection's fctl */
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200137 struct list blocked_list; /* list of streams blocked for other reasons (e.g. sfctl, dep) */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100138 struct buffer_wait buf_wait; /* wait list for buffer allocations */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200139 struct wait_event wait_event; /* To be used if we're waiting for I/Os */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200140};
141
Willy Tarreau18312642017-10-11 07:57:07 +0200142/* H2 stream state, in h2s->st */
143enum h2_ss {
144 H2_SS_IDLE = 0, // idle
145 H2_SS_RLOC, // reserved(local)
146 H2_SS_RREM, // reserved(remote)
147 H2_SS_OPEN, // open
148 H2_SS_HREM, // half-closed(remote)
149 H2_SS_HLOC, // half-closed(local)
Willy Tarreau96060ba2017-10-16 18:34:34 +0200150 H2_SS_ERROR, // an error needs to be sent using RST_STREAM
Willy Tarreau18312642017-10-11 07:57:07 +0200151 H2_SS_CLOSED, // closed
152 H2_SS_ENTRIES // must be last
153} __attribute__((packed));
154
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200155#define H2_SS_MASK(state) (1UL << (state))
156#define H2_SS_IDLE_BIT (1UL << H2_SS_IDLE)
157#define H2_SS_RLOC_BIT (1UL << H2_SS_RLOC)
158#define H2_SS_RREM_BIT (1UL << H2_SS_RREM)
159#define H2_SS_OPEN_BIT (1UL << H2_SS_OPEN)
160#define H2_SS_HREM_BIT (1UL << H2_SS_HREM)
161#define H2_SS_HLOC_BIT (1UL << H2_SS_HLOC)
162#define H2_SS_ERROR_BIT (1UL << H2_SS_ERROR)
163#define H2_SS_CLOSED_BIT (1UL << H2_SS_CLOSED)
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200164
Willy Tarreau18312642017-10-11 07:57:07 +0200165/* HTTP/2 stream flags (32 bit), in h2s->flags */
166#define H2_SF_NONE 0x00000000
167#define H2_SF_ES_RCVD 0x00000001
168#define H2_SF_ES_SENT 0x00000002
169
170#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
171#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
172
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200173/* stream flags indicating the reason the stream is blocked */
174#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200175#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux (must be in send list)
176#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl (must be in fctl list)
177#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl (must be in blocked list)
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200178#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
179
Willy Tarreau454f9052017-10-26 19:40:35 +0200180/* stream flags indicating how data is supposed to be sent */
181#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
Christopher Faulet7d247f02020-12-02 14:26:36 +0100182#define H2_SF_BODYLESS_RESP 0x00000200 /* Bodyless response message */
Christopher Fauletd0db4232021-01-22 11:46:30 +0100183#define H2_SF_BODY_TUNNEL 0x00000400 // Attempt to establish a Tunnelled stream (the result depends on the status code)
184
Willy Tarreau454f9052017-10-26 19:40:35 +0200185
Willy Tarreaud9464162020-01-10 18:25:07 +0100186#define H2_SF_NOTIFIED 0x00000800 // a paused stream was notified to try to send again
Willy Tarreau67434202017-11-06 20:20:51 +0100187#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100188#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100189
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100190#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
191
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200192#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
193#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200194#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200195
Amaury Denoyelle5fb48ea2020-12-11 17:53:04 +0100196#define H2_SF_EXT_CONNECT_SENT 0x00040000 // rfc 8441 an Extended CONNECT has been sent
Amaury Denoyelleefe22762020-12-11 17:53:08 +0100197#define H2_SF_EXT_CONNECT_RCVD 0x00080000 // rfc 8441 an Extended CONNECT has been received and parsed
Christopher Fauletd0db4232021-01-22 11:46:30 +0100198
Amaury Denoyelle5fb48ea2020-12-11 17:53:04 +0100199#define H2_SF_TUNNEL_ABRT 0x00100000 // A tunnel attempt was aborted
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200200
Willy Tarreau18312642017-10-11 07:57:07 +0200201/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
Christopher Fauletfafd1b02020-11-03 18:25:52 +0100202 * it is being processed in the internal HTTP representation (HTX).
Willy Tarreau18312642017-10-11 07:57:07 +0200203 */
204struct h2s {
205 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100206 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200207 struct h2c *h2c;
Willy Tarreau18312642017-10-11 07:57:07 +0200208 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200209 int32_t id; /* stream ID */
210 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200211 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200212 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
213 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200214 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100215 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200216 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Willy Tarreauf96508a2020-01-10 11:12:48 +0100217 struct wait_event *subs; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200218 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Willy Tarreau5723f292020-01-10 15:16:57 +0100219 struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to,
220 * in case there's no other subscription to do it */
Amaury Denoyelle74162742020-12-11 17:53:05 +0100221
222 char upgrade_protocol[16]; /* rfc 8441: requested protocol on Extended CONNECT */
Willy Tarreau18312642017-10-11 07:57:07 +0200223};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200224
Willy Tarreauc6405142017-09-21 20:23:50 +0200225/* descriptor for an h2 frame header */
226struct h2_fh {
227 uint32_t len; /* length, host order, 24 bits */
228 uint32_t sid; /* stream id, host order, 31 bits */
229 uint8_t ft; /* frame type */
230 uint8_t ff; /* frame flags */
231};
232
Willy Tarreau12ae2122019-08-08 18:23:12 +0200233/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200234static void h2_trace(enum trace_level level, uint64_t mask, \
235 const struct trace_source *src,
236 const struct ist where, const struct ist func,
237 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200238
239/* The event representation is split like this :
240 * strm - application layer
241 * h2s - internal H2 stream
242 * h2c - internal H2 connection
243 * conn - external connection
244 *
245 */
246static const struct trace_event h2_trace_events[] = {
247#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200248 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200249#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200250 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200251#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200252 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200253#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200254 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200255#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200256 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200257#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200258 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200259#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200260 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200261#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200262 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200263#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200264 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200265#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200266 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200267#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200268 { .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 +0200269#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200270 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200271#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200272 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200273#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200274 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200275#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200276 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200277#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200278 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200279#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200280 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200281#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200282 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200283#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200284 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200285#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200286 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200287#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200288 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200289#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200290 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200291#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200292 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200293#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200294 { .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 +0200295#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200296 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200297#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200298 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200299#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200300 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200301#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200302 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200303#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200304 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200305#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200306 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200307#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200308 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200309#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200310 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200311#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200312 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200313#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200314 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200315#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200316 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200317#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200318 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200319#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200320 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200321#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200322 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200323#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200324 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200325#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200326 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200327#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200328 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200329#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200330 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200331#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200332 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200333#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200334 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200335#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200336 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200337#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200338 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200339#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200340 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200341#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200342 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200343#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200344 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200345#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200346 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200347#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200348 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200349#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200350 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200351 { }
352};
353
354static const struct name_desc h2_trace_lockon_args[4] = {
355 /* arg1 */ { /* already used by the connection */ },
356 /* arg2 */ { .name="h2s", .desc="H2 stream" },
357 /* arg3 */ { },
358 /* arg4 */ { }
359};
360
361static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200362#define H2_VERB_CLEAN 1
363 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
364#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200365 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200366#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200367 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200368#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200369 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200370#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200371 { .name="complete", .desc="add full data dump when available" },
372 { /* end */ }
373};
374
Willy Tarreau6eb3d372021-04-10 19:29:26 +0200375static struct trace_source trace_h2 __read_mostly = {
Willy Tarreau12ae2122019-08-08 18:23:12 +0200376 .name = IST("h2"),
377 .desc = "HTTP/2 multiplexer",
378 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200379 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200380 .known_events = h2_trace_events,
381 .lockon_args = h2_trace_lockon_args,
382 .decoding = h2_trace_decoding,
383 .report_events = ~0, // report everything by default
384};
385
386#define TRACE_SOURCE &trace_h2
387INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
388
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100389/* h2 stats module */
390enum {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100391 H2_ST_HEADERS_RCVD,
392 H2_ST_DATA_RCVD,
393 H2_ST_SETTINGS_RCVD,
394 H2_ST_RST_STREAM_RCVD,
395 H2_ST_GOAWAY_RCVD,
396
Amaury Denoyellea8879232020-10-27 17:16:03 +0100397 H2_ST_CONN_PROTO_ERR,
398 H2_ST_STRM_PROTO_ERR,
399 H2_ST_RST_STREAM_RESP,
400 H2_ST_GOAWAY_RESP,
401
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100402 H2_ST_OPEN_CONN,
403 H2_ST_OPEN_STREAM,
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100404 H2_ST_TOTAL_CONN,
405 H2_ST_TOTAL_STREAM,
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100406
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100407 H2_STATS_COUNT /* must be the last member of the enum */
408};
409
410static struct name_desc h2_stats[] = {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100411 [H2_ST_HEADERS_RCVD] = { .name = "h2_headers_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100412 .desc = "Total number of received HEADERS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100413 [H2_ST_DATA_RCVD] = { .name = "h2_data_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100414 .desc = "Total number of received DATA frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100415 [H2_ST_SETTINGS_RCVD] = { .name = "h2_settings_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100416 .desc = "Total number of received SETTINGS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100417 [H2_ST_RST_STREAM_RCVD] = { .name = "h2_rst_stream_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100418 .desc = "Total number of received RST_STREAM frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100419 [H2_ST_GOAWAY_RCVD] = { .name = "h2_goaway_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100420 .desc = "Total number of received GOAWAY frames" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100421
422 [H2_ST_CONN_PROTO_ERR] = { .name = "h2_detected_conn_protocol_errors",
423 .desc = "Total number of connection protocol errors" },
424 [H2_ST_STRM_PROTO_ERR] = { .name = "h2_detected_strm_protocol_errors",
425 .desc = "Total number of stream protocol errors" },
426 [H2_ST_RST_STREAM_RESP] = { .name = "h2_rst_stream_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100427 .desc = "Total number of RST_STREAM sent on detected error" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100428 [H2_ST_GOAWAY_RESP] = { .name = "h2_goaway_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100429 .desc = "Total number of GOAWAY sent on detected error" },
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100430
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100431 [H2_ST_OPEN_CONN] = { .name = "h2_open_connections",
432 .desc = "Count of currently open connections" },
433 [H2_ST_OPEN_STREAM] = { .name = "h2_backend_open_streams",
434 .desc = "Count of currently open streams" },
Amaury Denoyelle377d8782021-02-03 16:27:22 +0100435 [H2_ST_TOTAL_CONN] = { .name = "h2_total_connections",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100436 .desc = "Total number of connections" },
Amaury Denoyelle377d8782021-02-03 16:27:22 +0100437 [H2_ST_TOTAL_STREAM] = { .name = "h2_backend_total_streams",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100438 .desc = "Total number of streams" },
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100439};
440
441static struct h2_counters {
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100442 long long headers_rcvd; /* total number of HEADERS frame received */
443 long long data_rcvd; /* total number of DATA frame received */
444 long long settings_rcvd; /* total number of SETTINGS frame received */
445 long long rst_stream_rcvd; /* total number of RST_STREAM frame received */
446 long long goaway_rcvd; /* total number of GOAWAY frame received */
Amaury Denoyellea8879232020-10-27 17:16:03 +0100447
448 long long conn_proto_err; /* total number of protocol errors detected */
449 long long strm_proto_err; /* total number of protocol errors detected */
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100450 long long rst_stream_resp; /* total number of RST_STREAM frame sent on error */
451 long long goaway_resp; /* total number of GOAWAY frame sent on error */
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100452
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100453 long long open_conns; /* count of currently open connections */
454 long long open_streams; /* count of currently open streams */
455 long long total_conns; /* total number of connections */
456 long long total_streams; /* total number of streams */
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100457} h2_counters;
458
459static void h2_fill_stats(void *data, struct field *stats)
460{
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100461 struct h2_counters *counters = data;
462
463 stats[H2_ST_HEADERS_RCVD] = mkf_u64(FN_COUNTER, counters->headers_rcvd);
464 stats[H2_ST_DATA_RCVD] = mkf_u64(FN_COUNTER, counters->data_rcvd);
465 stats[H2_ST_SETTINGS_RCVD] = mkf_u64(FN_COUNTER, counters->settings_rcvd);
466 stats[H2_ST_RST_STREAM_RCVD] = mkf_u64(FN_COUNTER, counters->rst_stream_rcvd);
467 stats[H2_ST_GOAWAY_RCVD] = mkf_u64(FN_COUNTER, counters->goaway_rcvd);
Amaury Denoyellea8879232020-10-27 17:16:03 +0100468
469 stats[H2_ST_CONN_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->conn_proto_err);
470 stats[H2_ST_STRM_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->strm_proto_err);
471 stats[H2_ST_RST_STREAM_RESP] = mkf_u64(FN_COUNTER, counters->rst_stream_resp);
472 stats[H2_ST_GOAWAY_RESP] = mkf_u64(FN_COUNTER, counters->goaway_resp);
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100473
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100474 stats[H2_ST_OPEN_CONN] = mkf_u64(FN_GAUGE, counters->open_conns);
475 stats[H2_ST_OPEN_STREAM] = mkf_u64(FN_GAUGE, counters->open_streams);
476 stats[H2_ST_TOTAL_CONN] = mkf_u64(FN_COUNTER, counters->total_conns);
477 stats[H2_ST_TOTAL_STREAM] = mkf_u64(FN_COUNTER, counters->total_streams);
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100478}
479
480static struct stats_module h2_stats_module = {
481 .name = "h2",
482 .fill_stats = h2_fill_stats,
483 .stats = h2_stats,
484 .stats_count = H2_STATS_COUNT,
485 .counters = &h2_counters,
486 .counters_size = sizeof(h2_counters),
487 .domain_flags = MK_STATS_PROXY_DOMAIN(STATS_PX_CAP_FE|STATS_PX_CAP_BE),
488 .clearable = 1,
489};
490
491INITCALL1(STG_REGISTER, stats_register_module, &h2_stats_module);
492
Willy Tarreau8ceae722018-11-26 11:58:30 +0100493/* the h2c connection pool */
494DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
495
496/* the h2s stream pool */
497DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
498
Willy Tarreaudc572362018-12-12 08:08:05 +0100499/* The default connection window size is 65535, it may only be enlarged using
500 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
501 * we'll pretend we already received the difference between the two to send
502 * an equivalent window update to enlarge it to 2G-1.
503 */
504#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
505
Willy Tarreau455d5682019-05-24 19:42:18 +0200506/* maximum amount of data we're OK with re-aligning for buffer optimizations */
507#define MAX_DATA_REALIGN 1024
508
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200509/* a few settings from the global section */
510static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200511static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100512static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100513static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200514
Willy Tarreau2a856182017-05-16 15:20:39 +0200515/* a dmumy closed stream */
516static const struct h2s *h2_closed_stream = &(const struct h2s){
517 .cs = NULL,
518 .h2c = NULL,
519 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100520 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100521 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200522 .id = 0,
523};
524
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100525/* a dmumy closed stream returning a PROTOCOL_ERROR error */
526static const struct h2s *h2_error_stream = &(const struct h2s){
527 .cs = NULL,
528 .h2c = NULL,
529 .st = H2_SS_CLOSED,
530 .errcode = H2_ERR_PROTOCOL_ERROR,
531 .flags = 0,
532 .id = 0,
533};
534
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100535/* a dmumy closed stream returning a REFUSED_STREAM error */
536static const struct h2s *h2_refused_stream = &(const struct h2s){
537 .cs = NULL,
538 .h2c = NULL,
539 .st = H2_SS_CLOSED,
540 .errcode = H2_ERR_REFUSED_STREAM,
541 .flags = 0,
542 .id = 0,
543};
544
Willy Tarreau2a856182017-05-16 15:20:39 +0200545/* and a dummy idle stream for use with any unannounced stream */
546static const struct h2s *h2_idle_stream = &(const struct h2s){
547 .cs = NULL,
548 .h2c = NULL,
549 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100550 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200551 .id = 0,
552};
553
Willy Tarreau144f84a2021-03-02 16:09:26 +0100554struct task *h2_timeout_task(struct task *t, void *context, unsigned int state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200555static int h2_send(struct h2c *h2c);
556static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200557static int h2_process(struct h2c *h2c);
Willy Tarreau691d5032021-01-20 14:55:01 +0100558/* h2_io_cb is exported to see it resolved in "show fd" */
Willy Tarreau144f84a2021-03-02 16:09:26 +0100559struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100560static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Amaury Denoyelle74162742020-12-11 17:53:05 +0100561static 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 +0100562static int h2_frt_transfer_data(struct h2s *h2s);
Willy Tarreau144f84a2021-03-02 16:09:26 +0100563struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100564static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100565static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200566
Willy Tarreauab2ec452019-08-30 07:07:08 +0200567/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
568static inline const char *h2c_st_to_str(enum h2_cs st)
569{
570 switch (st) {
571 case H2_CS_PREFACE: return "PRF";
572 case H2_CS_SETTINGS1: return "STG";
573 case H2_CS_FRAME_H: return "FRH";
574 case H2_CS_FRAME_P: return "FRP";
575 case H2_CS_FRAME_A: return "FRA";
576 case H2_CS_FRAME_E: return "FRE";
577 case H2_CS_ERROR: return "ERR";
578 case H2_CS_ERROR2: return "ER2";
579 default: return "???";
580 }
581}
582
583/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
584static inline const char *h2s_st_to_str(enum h2_ss st)
585{
586 switch (st) {
587 case H2_SS_IDLE: return "IDL"; // idle
588 case H2_SS_RLOC: return "RSL"; // reserved local
589 case H2_SS_RREM: return "RSR"; // reserved remote
590 case H2_SS_OPEN: return "OPN"; // open
591 case H2_SS_HREM: return "HCR"; // half-closed remote
592 case H2_SS_HLOC: return "HCL"; // half-closed local
593 case H2_SS_ERROR : return "ERR"; // error
594 case H2_SS_CLOSED: return "CLO"; // closed
595 default: return "???";
596 }
597}
598
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200599/* the H2 traces always expect that arg1, if non-null, is of type connection
600 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
601 * that arg3, if non-null, is either of type htx for tx headers, or of type
602 * buffer for everything else.
603 */
604static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
605 const struct ist where, const struct ist func,
606 const void *a1, const void *a2, const void *a3, const void *a4)
607{
608 const struct connection *conn = a1;
609 const struct h2c *h2c = conn ? conn->ctx : NULL;
610 const struct h2s *h2s = a2;
611 const struct buffer *buf = a3;
612 const struct htx *htx;
613 int pos;
614
615 if (!h2c) // nothing to add
616 return;
617
Willy Tarreau17104d42019-08-30 07:12:55 +0200618 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200619 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
620
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100621 if (h2c->errcode)
622 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode);
623
Willy Tarreau73db4342019-09-25 07:28:44 +0200624 if (h2c->dsi >= 0 &&
625 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
Willy Tarreau8520d872020-09-18 07:39:29 +0200626 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 +0200627 }
628
629 if (h2s) {
630 if (h2s->id <= 0)
631 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
632 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100633 if (h2s->id && h2s->errcode)
634 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode);
Willy Tarreau73db4342019-09-25 07:28:44 +0200635 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200636 }
637
638 /* Let's dump decoded requests and responses right after parsing. They
639 * are traced at level USER with a few recognizable flags.
640 */
641 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
642 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
643 htx = htxbuf(buf); // recv req/res
644 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
645 htx = a3; // send req/res
646 else
647 htx = NULL;
648
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200649 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200650 const struct htx_blk *blk = htx_get_blk(htx, pos);
651 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
652 enum htx_blk_type type = htx_get_blk_type(blk);
653
654 if (type == HTX_BLK_REQ_SL)
655 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200656 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200657 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
658 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
659 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
660 else if (type == HTX_BLK_RES_SL)
661 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*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 }
667}
668
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200669
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100670/* Detect a pending read0 for a H2 connection. It happens if a read0 was
671 * already reported on a previous xprt->rcvbuf() AND a frame parser failed
672 * to parse pending data, confirming no more progress is possible because
673 * we're facing a truncated frame. The function returns 1 to report a read0
674 * or 0 otherwise.
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200675 */
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100676static inline int h2c_read0_pending(struct h2c *h2c)
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200677{
Willy Tarreau3d4631f2021-01-20 10:53:13 +0100678 return !!(h2c->flags & H2_CF_END_REACHED);
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200679}
680
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200681/* returns true if the connection is allowed to expire, false otherwise. A
682 * connection may expire when:
683 * - it has no stream
684 * - it has data in the mux buffer
685 * - it has streams in the blocked list
686 * - it has streams in the fctl list
687 * - it has streams in the send list
688 * Otherwise it means some streams are waiting in the data layer and it should
689 * not expire.
690 */
691static inline int h2c_may_expire(const struct h2c *h2c)
692{
693 return eb_is_empty(&h2c->streams_by_id) ||
694 br_data(h2c->mbuf) ||
695 !LIST_ISEMPTY(&h2c->blocked_list) ||
696 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100697 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200698}
699
Olivier Houchard7a977432019-03-21 15:47:13 +0100700static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200701h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100702{
703 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
704 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
705 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
706 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200707 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100708 (conn_xprt_read0_pending(h2c->conn) ||
709 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
710 return 1;
711
712 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100713}
714
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200715/*****************************************************/
716/* functions below are for dynamic buffer management */
717/*****************************************************/
718
Willy Tarreau315d8072017-12-10 22:17:57 +0100719/* indicates whether or not the we may call the h2_recv() function to attempt
720 * to receive data into the buffer and/or demux pending data. The condition is
721 * a bit complex due to some API limits for now. The rules are the following :
722 * - if an error or a shutdown was detected on the connection and the buffer
723 * is empty, we must not attempt to receive
724 * - if the demux buf failed to be allocated, we must not try to receive and
725 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100726 * - if no flag indicates a blocking condition, we may attempt to receive,
727 * regardless of whether the demux buffer is full or not, so that only
728 * de demux part decides whether or not to block. This is needed because
729 * the connection API indeed prevents us from re-enabling receipt that is
730 * already enabled in a polled state, so we must always immediately stop
731 * as soon as the demux can't proceed so as never to hit an end of read
732 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100733 * - otherwise must may not attempt
734 */
735static inline int h2_recv_allowed(const struct h2c *h2c)
736{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200737 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100738 (h2c->st0 >= H2_CS_ERROR ||
739 h2c->conn->flags & CO_FL_ERROR ||
740 conn_xprt_read0_pending(h2c->conn)))
741 return 0;
742
743 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100744 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100745 return 1;
746
747 return 0;
748}
749
Willy Tarreau47b515a2018-12-21 16:09:41 +0100750/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200751static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100752{
753 if (!h2_recv_allowed(h2c))
754 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200755 if ((!consider_buffer || !b_data(&h2c->dbuf))
756 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100757 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200758 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100759}
760
761
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100762/* returns true if the front connection has too many conn_streams attached */
763static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200764{
Willy Tarreaua8754662018-12-23 20:43:58 +0100765 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200766}
767
Willy Tarreau44e973f2018-03-01 17:49:30 +0100768/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
769 * flags are used to figure what buffer was requested. It returns 1 if the
770 * allocation succeeds, in which case the connection is woken up, or 0 if it's
771 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200772 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100773static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200774{
775 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100776 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200777
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100778 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc(&h2c->dbuf)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200779 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200780 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200781 return 1;
782 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200783
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100784 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc(br_tail(h2c->mbuf))) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100785 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200786
787 if (h2c->flags & H2_CF_DEM_MROOM) {
788 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200789 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200790 }
Willy Tarreau14398122017-09-22 14:26:04 +0200791 return 1;
792 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100793
794 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
795 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100796 b_alloc(&h2s->rxbuf)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100797 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200798 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100799 return 1;
800 }
801
Willy Tarreau14398122017-09-22 14:26:04 +0200802 return 0;
803}
804
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200805static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200806{
807 struct buffer *buf = NULL;
808
Willy Tarreau2b718102021-04-21 07:32:39 +0200809 if (likely(!LIST_INLIST(&h2c->buf_wait.list)) &&
Willy Tarreaud68d4f12021-03-22 14:44:31 +0100810 unlikely((buf = b_alloc(bptr)) == NULL)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100811 h2c->buf_wait.target = h2c;
812 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau2b718102021-04-21 07:32:39 +0200813 LIST_APPEND(&ti->buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200814 }
815 return buf;
816}
817
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200818static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200819{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200820 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100821 b_free(bptr);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +0100822 offer_buffers(NULL, 1);
Willy Tarreau14398122017-09-22 14:26:04 +0200823 }
824}
825
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200826static inline void h2_release_mbuf(struct h2c *h2c)
827{
828 struct buffer *buf;
829 unsigned int count = 0;
830
831 while (b_size(buf = br_head_pick(h2c->mbuf))) {
832 b_free(buf);
833 count++;
834 }
835 if (count)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +0100836 offer_buffers(NULL, count);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200837}
838
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100839/* returns the number of allocatable outgoing streams for the connection taking
840 * the last_sid and the reserved ones into account.
841 */
842static inline int h2_streams_left(const struct h2c *h2c)
843{
844 int ret;
845
846 /* consider the number of outgoing streams we're allowed to create before
847 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
848 * nb_reserved is the number of streams which don't yet have an ID.
849 */
850 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
851 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
852 if (ret < 0)
853 ret = 0;
854 return ret;
855}
856
Willy Tarreau00f18a32019-01-26 12:19:01 +0100857/* returns the number of streams in use on a connection to figure if it's
858 * idle or not. We check nb_cs and not nb_streams as the caller will want
859 * to know if it was the last one after a detach().
860 */
861static int h2_used_streams(struct connection *conn)
862{
863 struct h2c *h2c = conn->ctx;
864
865 return h2c->nb_cs;
866}
867
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100868/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100869static int h2_avail_streams(struct connection *conn)
870{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100871 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100872 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100873 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100874
Willy Tarreau6afec462019-01-28 06:40:19 +0100875 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
876 * streams on the connection.
877 */
878 if (h2c->last_sid >= 0)
879 return 0;
880
Willy Tarreauc61966f2019-10-31 15:10:03 +0100881 if (h2c->st0 >= H2_CS_ERROR)
882 return 0;
883
Willy Tarreau86949782019-01-31 10:42:05 +0100884 /* note: may be negative if a SETTINGS frame changes the limit */
885 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100886
887 /* we must also consider the limit imposed by stream IDs */
888 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100889 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100890 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100891 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
892 ret1 = MIN(ret1, ret2);
893 }
894 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100895}
896
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200897
Willy Tarreau62f52692017-10-08 23:01:42 +0200898/*****************************************************************/
899/* functions below are dedicated to the mux setup and management */
900/*****************************************************************/
901
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200902/* Initialize the mux once it's attached. For outgoing connections, the context
903 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200904 * connections from the fact that the context is still NULL (even during mux
905 * upgrades). <input> is always used as Input buffer and may contain data. It is
906 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200907 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200908static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
909 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200910{
911 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100912 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200913 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200914
Christopher Fauletf81ef032019-10-04 15:19:43 +0200915 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200916
Willy Tarreaubafbe012017-11-24 17:34:44 +0100917 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200918 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200919 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200920
Christopher Faulete9b70722019-04-08 10:46:02 +0200921 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200922 h2c->flags = H2_CF_IS_BACK;
923 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
924 if (tick_isset(prx->timeout.serverfin))
925 h2c->shut_timeout = prx->timeout.serverfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100926
927 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be,
928 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200929 } else {
930 h2c->flags = H2_CF_NONE;
931 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
932 if (tick_isset(prx->timeout.clientfin))
933 h2c->shut_timeout = prx->timeout.clientfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100934
935 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe,
936 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200937 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100938
Willy Tarreau0b37d652018-10-03 10:33:02 +0200939 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100940 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100941 if (tick_isset(h2c->timeout)) {
942 t = task_new(tid_bit);
943 if (!t)
944 goto fail;
945
946 h2c->task = t;
947 t->process = h2_timeout_task;
948 t->context = h2c;
949 t->expire = tick_add(now_ms, h2c->timeout);
950 }
Willy Tarreauea392822017-10-31 10:02:25 +0100951
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200952 h2c->wait_event.tasklet = tasklet_new();
953 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200954 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200955 h2c->wait_event.tasklet->process = h2_io_cb;
956 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100957 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200958
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200959 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200960 if (!h2c->ddht)
961 goto fail;
962
963 /* Initialise the context. */
964 h2c->st0 = H2_CS_PREFACE;
965 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100966 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200967 h2c->max_id = -1;
968 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100969 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200970 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100971 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200972 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100973 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100974 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200975
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200976 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200977 h2c->dsi = -1;
978 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100979
Willy Tarreau32218eb2017-09-22 08:07:25 +0200980 h2c->last_sid = -1;
981
Willy Tarreau51330962019-05-26 09:38:07 +0200982 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200983 h2c->miw = 65535; /* mux initial window size */
984 h2c->mws = 65535; /* mux window size */
985 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200986 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200987 LIST_INIT(&h2c->send_list);
988 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200989 LIST_INIT(&h2c->blocked_list);
Willy Tarreau90f366b2021-02-20 11:49:49 +0100990 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200991
Christopher Fauletf81ef032019-10-04 15:19:43 +0200992 conn->ctx = h2c;
993
Willy Tarreau3f133572017-10-31 19:21:06 +0100994 if (t)
995 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100996
Willy Tarreau01b44822018-10-03 14:26:37 +0200997 if (h2c->flags & H2_CF_IS_BACK) {
998 /* FIXME: this is temporary, for outgoing connections we need
999 * to immediately allocate a stream until the code is modified
1000 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +02001001 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +02001002 */
1003 struct h2s *h2s;
1004
Christopher Fauletf81ef032019-10-04 15:19:43 +02001005 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +02001006 if (!h2s)
1007 goto fail_stream;
1008 }
1009
Willy Tarreau4781b152021-04-06 13:53:36 +02001010 HA_ATOMIC_INC(&h2c->px_counters->open_conns);
1011 HA_ATOMIC_INC(&h2c->px_counters->total_conns);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001012
Willy Tarreau0f383582018-10-03 14:22:21 +02001013 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02001014 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001015 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001016 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +02001017 fail_stream:
1018 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +02001019 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +02001020 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001021 if (h2c->wait_event.tasklet)
1022 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +01001023 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +02001024 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +02001025 conn->ctx = conn_ctx; /* restore saved ctx */
1026 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001027 return -1;
1028}
1029
Willy Tarreau751f2d02018-10-05 09:35:00 +02001030/* returns the next allocatable outgoing stream ID for the H2 connection, or
1031 * -1 if no more is allocatable.
1032 */
1033static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
1034{
1035 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +01001036
1037 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +02001038 id = -1;
1039 return id;
1040}
1041
Willy Tarreau2373acc2017-10-12 17:35:14 +02001042/* returns the stream associated with id <id> or NULL if not found */
1043static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
1044{
1045 struct eb32_node *node;
1046
Willy Tarreau751f2d02018-10-05 09:35:00 +02001047 if (id == 0)
1048 return (struct h2s *)h2_closed_stream;
1049
Willy Tarreau2a856182017-05-16 15:20:39 +02001050 if (id > h2c->max_id)
1051 return (struct h2s *)h2_idle_stream;
1052
Willy Tarreau2373acc2017-10-12 17:35:14 +02001053 node = eb32_lookup(&h2c->streams_by_id, id);
1054 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +02001055 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +02001056
1057 return container_of(node, struct h2s, by_id);
1058}
1059
Christopher Faulet73c12072019-04-08 11:23:22 +02001060/* release function. This one should be called to free all resources allocated
1061 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +02001062 */
Christopher Faulet73c12072019-04-08 11:23:22 +02001063static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02001064{
William Dauchy477757c2020-08-07 22:19:23 +02001065 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001066
Willy Tarreau7838a792019-08-12 18:42:03 +02001067 TRACE_ENTER(H2_EV_H2C_END);
1068
Willy Tarreau32218eb2017-09-22 08:07:25 +02001069 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +02001070 /* The connection must be aattached to this mux to be released */
1071 if (h2c->conn && h2c->conn->ctx == h2c)
1072 conn = h2c->conn;
1073
Willy Tarreau7838a792019-08-12 18:42:03 +02001074 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001075 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +02001076
Willy Tarreau2b718102021-04-21 07:32:39 +02001077 if (LIST_INLIST(&h2c->buf_wait.list))
Willy Tarreau90f366b2021-02-20 11:49:49 +01001078 LIST_DEL_INIT(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +02001079
Willy Tarreau44e973f2018-03-01 17:49:30 +01001080 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +02001081 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +01001082
Willy Tarreauea392822017-10-31 10:02:25 +01001083 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +02001084 h2c->task->context = NULL;
1085 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +01001086 h2c->task = NULL;
1087 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001088 if (h2c->wait_event.tasklet)
1089 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +02001090 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01001091 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +02001092 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +01001093
Willy Tarreau4781b152021-04-06 13:53:36 +02001094 HA_ATOMIC_DEC(&h2c->px_counters->open_conns);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001095
Willy Tarreaubafbe012017-11-24 17:34:44 +01001096 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001097 }
1098
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001099 if (conn) {
1100 conn->mux = NULL;
1101 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02001102 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001103
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001104 conn_stop_tracking(conn);
1105 conn_full_close(conn);
1106 if (conn->destroy_cb)
1107 conn->destroy_cb(conn);
1108 conn_free(conn);
1109 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001110
1111 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +02001112}
1113
1114
Willy Tarreau71681172017-10-23 14:39:06 +02001115/******************************************************/
1116/* functions below are for the H2 protocol processing */
1117/******************************************************/
1118
1119/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +01001120static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +02001121{
1122 return h2s ? h2s->id : 0;
1123}
1124
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001125/* returns the sum of the stream's own window size and the mux's initial
1126 * window, which together form the stream's effective window size.
1127 */
1128static inline int h2s_mws(const struct h2s *h2s)
1129{
1130 return h2s->sws + h2s->h2c->miw;
1131}
1132
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001133/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001134static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001135{
1136 if (h2c->msi < 0)
1137 return 0;
1138
1139 if (h2c->msi == h2s_id(h2s))
1140 return 0;
1141
1142 return 1;
1143}
1144
Willy Tarreau741d6df2017-10-17 08:00:59 +02001145/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001146static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001147{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001148 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001149 h2c->errcode = err;
1150 h2c->st0 = H2_CS_ERROR;
1151}
1152
Willy Tarreau175cebb2019-01-24 10:02:24 +01001153/* marks an error on the stream. It may also update an already closed stream
1154 * (e.g. to report an error after an RST was received).
1155 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001156static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001157{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001158 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001159 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001160 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001161 if (h2s->st < H2_SS_ERROR)
1162 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001163 if (h2s->cs)
1164 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001165 }
1166}
1167
Willy Tarreau7e094452018-12-19 18:08:52 +01001168/* attempt to notify the data layer of recv availability */
1169static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1170{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001171 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001172 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001173 tasklet_wakeup(h2s->subs->tasklet);
1174 h2s->subs->events &= ~SUB_RETRY_RECV;
1175 if (!h2s->subs->events)
1176 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001177 }
1178}
1179
1180/* attempt to notify the data layer of send availability */
1181static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1182{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001183 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001184 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001185 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001186 tasklet_wakeup(h2s->subs->tasklet);
1187 h2s->subs->events &= ~SUB_RETRY_SEND;
1188 if (!h2s->subs->events)
1189 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001190 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001191 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1192 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1193 tasklet_wakeup(h2s->shut_tl);
1194 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001195}
1196
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001197/* alerts the data layer, trying to wake it up by all means, following
1198 * this sequence :
1199 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1200 * - if its subscribed to send, then it's woken up for send
1201 * - if it was subscribed to neither, its ->wake() callback is called
1202 * It is safe to call this function with a closed stream which doesn't have a
1203 * conn_stream anymore.
1204 */
1205static void __maybe_unused h2s_alert(struct h2s *h2s)
1206{
Willy Tarreau7838a792019-08-12 18:42:03 +02001207 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1208
Willy Tarreauf96508a2020-01-10 11:12:48 +01001209 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001210 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001211 h2s_notify_recv(h2s);
1212 h2s_notify_send(h2s);
1213 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001214 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1215 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001216 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001217 }
1218
1219 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001220}
1221
Willy Tarreaue4820742017-07-27 13:37:23 +02001222/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001223static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001224{
1225 uint8_t *out = frame;
1226
1227 *out = len >> 16;
1228 write_n16(out + 1, len);
1229}
1230
Willy Tarreau54c15062017-10-10 17:10:03 +02001231/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1232 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1233 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001234 * available in the buffer's input prior to calling this function. The buffer
1235 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001236 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001237static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001238 const struct buffer *b, int o)
1239{
Willy Tarreau591d4452018-06-15 17:21:00 +02001240 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 +02001241}
1242
Willy Tarreau1f094672017-11-20 21:27:45 +01001243static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001244{
Willy Tarreau591d4452018-06-15 17:21:00 +02001245 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001246}
1247
Willy Tarreau1f094672017-11-20 21:27:45 +01001248static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001249{
Willy Tarreau591d4452018-06-15 17:21:00 +02001250 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001251}
1252
Willy Tarreau1f094672017-11-20 21:27:45 +01001253static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001254{
Willy Tarreau591d4452018-06-15 17:21:00 +02001255 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001256}
1257
1258
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001259/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1260 * The algorithm is not obvious. It turns out that H2 headers are neither
1261 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1262 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001263 *
1264 * b0 b1 b2 b3 b4 b5..b8
1265 * +----------+---------+--------+----+----+----------------------+
1266 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1267 * +----------+---------+--------+----+----+----------------------+
1268 *
1269 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1270 * we get the sid properly aligned and ordered, and 16 bits of len properly
1271 * ordered as well. The type and flags can be extracted using bit shifts from
1272 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001273 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1274 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001275 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001276static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001277{
1278 uint64_t w;
1279
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001280 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001281 return 0;
1282
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001283 w = h2_get_n64(b, o + 1);
1284 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001285 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1286 h->ff = w >> 32;
1287 h->ft = w >> 40;
1288 h->len += w >> 48;
1289 return 1;
1290}
1291
1292/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1293 * h2_peek_frame_hdr() above.
1294 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001295static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001296{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001297 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001298}
1299
1300/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001301static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001302{
1303 int ret;
1304
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001305 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001306 if (ret > 0)
1307 h2_skip_frame_hdr(b);
1308 return ret;
1309}
1310
Willy Tarreaucb985a42019-10-07 16:56:34 +02001311
1312/* try to fragment the headers frame present at the beginning of buffer <b>,
1313 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1314 * success. Typical causes of failure include a buffer not large enough to
1315 * add extra frame headers. The existing frame size is read in the current
1316 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1317 * and its length will be adjusted. The stream ID for continuation frames will
1318 * be copied from the initial frame's.
1319 */
1320static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1321{
1322 size_t remain = b->data - 9;
1323 int extra_frames = (remain - 1) / mfs;
1324 size_t fsize;
1325 char *fptr;
1326 int frame;
1327
1328 if (b->data <= mfs + 9)
1329 return 1;
1330
1331 /* Too large a frame, we need to fragment it using CONTINUATION
1332 * frames. We start from the end and move tails as needed.
1333 */
1334 if (b->data + extra_frames * 9 > b->size)
1335 return 0;
1336
1337 for (frame = extra_frames; frame; frame--) {
1338 fsize = ((remain - 1) % mfs) + 1;
1339 remain -= fsize;
1340
1341 /* move data */
1342 fptr = b->area + 9 + remain + (frame - 1) * 9;
1343 memmove(fptr + 9, b->area + 9 + remain, fsize);
1344 b->data += 9;
1345
1346 /* write new frame header */
1347 h2_set_frame_size(fptr, fsize);
1348 fptr[3] = H2_FT_CONTINUATION;
1349 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1350 write_n32(fptr + 5, read_n32(b->area + 5));
1351 }
1352
1353 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1354 h2_set_frame_size(b->area, remain);
1355 return 1;
1356}
1357
1358
Willy Tarreau00dd0782018-03-01 16:31:34 +01001359/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1360 * its connection if the stream was not yet closed. Please use this exclusively
1361 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001362 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001363static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001364{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001365 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001366 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001367 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001368 if (!h2s->id)
1369 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001370 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001371 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1372 h2s_notify_recv(h2s);
1373 }
Willy Tarreau4781b152021-04-06 13:53:36 +02001374 HA_ATOMIC_DEC(&h2s->h2c->px_counters->open_streams);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001375
Willy Tarreau7838a792019-08-12 18:42:03 +02001376 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001377 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001378 h2s->st = H2_SS_CLOSED;
1379}
1380
Willy Tarreau71049cc2018-03-28 13:56:39 +02001381/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001382/* h2s_destroy should only ever be called by the thread that owns the stream,
1383 * that means that a tasklet should be used if we want to destroy the h2s
1384 * from another thread
1385 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001386static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001387{
Willy Tarreau7838a792019-08-12 18:42:03 +02001388 struct connection *conn = h2s->h2c->conn;
1389
1390 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1391
Willy Tarreau0a10de62018-03-01 16:27:53 +01001392 h2s_close(h2s);
1393 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001394 if (b_size(&h2s->rxbuf)) {
1395 b_free(&h2s->rxbuf);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01001396 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02001397 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001398
1399 if (h2s->subs)
1400 h2s->subs->events = 0;
1401
Joseph Herlantd77575d2018-11-25 10:54:45 -08001402 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001403 * reference left would be in the h2c send_list/fctl_list, and if
1404 * we're in it, we're getting out anyway
1405 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001406 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001407
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001408 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001409 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001410 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001411
1412 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001413}
1414
Willy Tarreaua8e49542018-10-03 18:53:55 +02001415/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1416 * stream tree. In case of error, nothing is added and NULL is returned. The
1417 * causes of errors can be any failed memory allocation. The caller is
1418 * responsible for checking if the connection may support an extra stream
1419 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001420 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001421static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001422{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001423 struct h2s *h2s;
1424
Willy Tarreau7838a792019-08-12 18:42:03 +02001425 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1426
Willy Tarreaubafbe012017-11-24 17:34:44 +01001427 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001428 if (!h2s)
1429 goto out;
1430
Willy Tarreau5723f292020-01-10 15:16:57 +01001431 h2s->shut_tl = tasklet_new();
1432 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001433 pool_free(pool_head_h2s, h2s);
1434 goto out;
1435 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001436 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001437 h2s->shut_tl->process = h2_deferred_shut;
1438 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001439 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001440 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001441 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001442 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001443 h2s->flags = H2_SF_NONE;
1444 h2s->errcode = H2_ERR_NO_ERROR;
1445 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001446 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001447 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001448 h2s->rxbuf = BUF_NULL;
Amaury Denoyelle74162742020-12-11 17:53:05 +01001449 memset(h2s->upgrade_protocol, 0, sizeof(h2s->upgrade_protocol));
Willy Tarreau751f2d02018-10-05 09:35:00 +02001450
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001451 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001452 if (id > 0)
1453 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001454 else
1455 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001456
1457 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001458 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001459 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001460
Willy Tarreau4781b152021-04-06 13:53:36 +02001461 HA_ATOMIC_INC(&h2c->px_counters->open_streams);
1462 HA_ATOMIC_INC(&h2c->px_counters->total_streams);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001463
Willy Tarreau7838a792019-08-12 18:42:03 +02001464 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001465 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001466 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001467 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001468 return NULL;
1469}
1470
1471/* creates a new stream <id> on the h2c connection and returns it, or NULL in
Christopher Faulet7d013e72020-12-15 16:56:50 +01001472 * case of memory allocation error. <input> is used as input buffer for the new
1473 * stream. On success, it is transferred to the stream and the mux is no longer
1474 * responsible of it. On error, <input> is unchanged, thus the mux must still
1475 * take care of it.
Willy Tarreaua8e49542018-10-03 18:53:55 +02001476 */
Christopher Faulet7d013e72020-12-15 16:56:50 +01001477static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id, struct buffer *input)
Willy Tarreaua8e49542018-10-03 18:53:55 +02001478{
1479 struct session *sess = h2c->conn->owner;
1480 struct conn_stream *cs;
1481 struct h2s *h2s;
1482
Willy Tarreau7838a792019-08-12 18:42:03 +02001483 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1484
Willy Tarreaua8e49542018-10-03 18:53:55 +02001485 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1486 goto out;
1487
1488 h2s = h2s_new(h2c, id);
1489 if (!h2s)
1490 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001491
Christopher Faulet236c93b2020-07-02 09:19:54 +02001492 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001493 if (!cs)
1494 goto out_close;
1495
Olivier Houchard746fb772018-12-15 19:42:00 +01001496 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001497 h2s->cs = cs;
1498 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001499 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001500
Christopher Faulet7d013e72020-12-15 16:56:50 +01001501 if (stream_create_from_cs(cs, input) < 0)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001502 goto out_free_cs;
1503
Willy Tarreau590a0512018-09-05 11:56:48 +02001504 /* We want the accept date presented to the next stream to be the one
1505 * we have now, the handshake time to be null (since the next stream
1506 * is not delayed by a handshake), and the idle time to count since
1507 * right now.
1508 */
1509 sess->accept_date = date;
1510 sess->tv_accept = now;
1511 sess->t_handshake = 0;
1512
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001513 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001514 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001515 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001516 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001517 return h2s;
1518
1519 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001520 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001521 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001522 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001523 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001524 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001525 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001526 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001527 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001528 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001529}
1530
Willy Tarreau751f2d02018-10-05 09:35:00 +02001531/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1532 * and returns it, or NULL in case of memory allocation error or if the highest
1533 * possible stream ID was reached.
1534 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001535static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001536{
1537 struct h2s *h2s = NULL;
1538
Willy Tarreau7838a792019-08-12 18:42:03 +02001539 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1540
Willy Tarreau86949782019-01-31 10:42:05 +01001541 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001542 goto out;
1543
Willy Tarreaua80dca82019-01-24 17:08:28 +01001544 if (h2_streams_left(h2c) < 1)
1545 goto out;
1546
Willy Tarreau751f2d02018-10-05 09:35:00 +02001547 /* Defer choosing the ID until we send the first message to create the stream */
1548 h2s = h2s_new(h2c, 0);
1549 if (!h2s)
1550 goto out;
1551
1552 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001553 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001554 cs->ctx = h2s;
1555 h2c->nb_cs++;
1556
Willy Tarreau751f2d02018-10-05 09:35:00 +02001557 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001558 if (likely(h2s))
1559 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1560 else
1561 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001562 return h2s;
1563}
1564
Willy Tarreaube5b7152017-09-25 16:25:39 +02001565/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1566 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1567 * the various settings codes.
1568 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001569static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001570{
1571 struct buffer *res;
1572 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001573 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001574 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001575 int ret = 0;
1576
1577 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001578
1579 if (h2c_mux_busy(h2c, NULL)) {
1580 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001581 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001582 }
1583
Willy Tarreaube5b7152017-09-25 16:25:39 +02001584 chunk_init(&buf, buf_data, sizeof(buf_data));
1585 chunk_memcpy(&buf,
1586 "\x00\x00\x00" /* length : 0 for now */
1587 "\x04\x00" /* type : 4 (settings), flags : 0 */
1588 "\x00\x00\x00\x00", /* stream ID : 0 */
1589 9);
1590
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001591 if (h2c->flags & H2_CF_IS_BACK) {
1592 /* send settings_enable_push=0 */
1593 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1594 }
1595
Amaury Denoyellef9dcbee2020-12-11 17:53:10 +01001596 /* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1
1597 * sent automatically */
1598 chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6);
1599
Willy Tarreaube5b7152017-09-25 16:25:39 +02001600 if (h2_settings_header_table_size != 4096) {
1601 char str[6] = "\x00\x01"; /* header_table_size */
1602
1603 write_n32(str + 2, h2_settings_header_table_size);
1604 chunk_memcat(&buf, str, 6);
1605 }
1606
1607 if (h2_settings_initial_window_size != 65535) {
1608 char str[6] = "\x00\x04"; /* initial_window_size */
1609
1610 write_n32(str + 2, h2_settings_initial_window_size);
1611 chunk_memcat(&buf, str, 6);
1612 }
1613
1614 if (h2_settings_max_concurrent_streams != 0) {
1615 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1616
1617 /* Note: 0 means "unlimited" for haproxy's config but not for
1618 * the protocol, so never send this value!
1619 */
1620 write_n32(str + 2, h2_settings_max_concurrent_streams);
1621 chunk_memcat(&buf, str, 6);
1622 }
1623
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001624 mfs = h2_settings_max_frame_size;
1625 if (mfs > global.tune.bufsize)
1626 mfs = global.tune.bufsize;
1627
1628 if (!mfs)
1629 mfs = global.tune.bufsize;
1630
1631 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001632 char str[6] = "\x00\x05"; /* max_frame_size */
1633
1634 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1635 * match bufsize - rewrite size, but at the moment it seems
1636 * that clients don't take care of it.
1637 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001638 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001639 chunk_memcat(&buf, str, 6);
1640 }
1641
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001642 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001643
1644 res = br_tail(h2c->mbuf);
1645 retry:
1646 if (!h2_get_buf(h2c, res)) {
1647 h2c->flags |= H2_CF_MUX_MALLOC;
1648 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001649 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001650 }
1651
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001652 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001653 if (unlikely(ret <= 0)) {
1654 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001655 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1656 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001657 h2c->flags |= H2_CF_MUX_MFULL;
1658 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001659 }
1660 else {
1661 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001662 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001663 }
1664 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001665 out:
1666 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001667 return ret;
1668}
1669
Willy Tarreau52eed752017-09-22 15:05:09 +02001670/* Try to receive a connection preface, then upon success try to send our
1671 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1672 * missing data. It may return an error in h2c.
1673 */
1674static int h2c_frt_recv_preface(struct h2c *h2c)
1675{
1676 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001677 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001678
Willy Tarreau7838a792019-08-12 18:42:03 +02001679 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1680
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001681 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001682
1683 if (unlikely(ret1 <= 0)) {
Amaury Denoyellea8879232020-10-27 17:16:03 +01001684 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn)) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01001685 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 +02001686 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02001687 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Amaury Denoyellea8879232020-10-27 17:16:03 +01001688 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001689 ret2 = 0;
1690 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001691 }
1692
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001693 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001694 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001695 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001696 out:
1697 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001698 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001699}
1700
Willy Tarreau01b44822018-10-03 14:26:37 +02001701/* Try to send a connection preface, then upon success try to send our
1702 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1703 * missing data. It may return an error in h2c.
1704 */
1705static int h2c_bck_send_preface(struct h2c *h2c)
1706{
1707 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001708 int ret = 0;
1709
1710 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001711
1712 if (h2c_mux_busy(h2c, NULL)) {
1713 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001714 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001715 }
1716
Willy Tarreaubcc45952019-05-26 10:05:50 +02001717 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001718 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001719 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001720 h2c->flags |= H2_CF_MUX_MALLOC;
1721 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001722 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001723 }
1724
1725 if (!b_data(res)) {
1726 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001727 ret = b_istput(res, ist(H2_CONN_PREFACE));
1728 if (unlikely(ret <= 0)) {
1729 if (!ret) {
1730 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1731 goto retry;
1732 h2c->flags |= H2_CF_MUX_MFULL;
1733 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001734 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001735 }
1736 else {
1737 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001738 ret = 0;
1739 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001740 }
1741 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001742 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001743 ret = h2c_send_settings(h2c);
1744 out:
1745 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1746 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001747}
1748
Willy Tarreau081d4722017-05-16 21:51:05 +02001749/* try to send a GOAWAY frame on the connection to report an error or a graceful
1750 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1751 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1752 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1753 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1754 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1755 * on unrecoverable failure. It will not attempt to send one again in this last
1756 * case so that it is safe to use h2c_error() to report such errors.
1757 */
1758static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1759{
1760 struct buffer *res;
1761 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001762 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001763
Willy Tarreau7838a792019-08-12 18:42:03 +02001764 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1765
1766 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1767 ret = 1; // claim that it worked
1768 goto out;
1769 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001770
1771 if (h2c_mux_busy(h2c, h2s)) {
1772 if (h2s)
1773 h2s->flags |= H2_SF_BLK_MBUSY;
1774 else
1775 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001776 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001777 }
1778
Willy Tarreau9c218e72019-05-26 10:08:28 +02001779 /* len: 8, type: 7, flags: none, sid: 0 */
1780 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1781
1782 if (h2c->last_sid < 0)
1783 h2c->last_sid = h2c->max_id;
1784
1785 write_n32(str + 9, h2c->last_sid);
1786 write_n32(str + 13, h2c->errcode);
1787
Willy Tarreaubcc45952019-05-26 10:05:50 +02001788 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001789 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001790 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001791 h2c->flags |= H2_CF_MUX_MALLOC;
1792 if (h2s)
1793 h2s->flags |= H2_SF_BLK_MROOM;
1794 else
1795 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001796 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001797 }
1798
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001799 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001800 if (unlikely(ret <= 0)) {
1801 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001802 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1803 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001804 h2c->flags |= H2_CF_MUX_MFULL;
1805 if (h2s)
1806 h2s->flags |= H2_SF_BLK_MROOM;
1807 else
1808 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001809 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001810 }
1811 else {
1812 /* we cannot report this error using GOAWAY, so we mark
1813 * it and claim a success.
1814 */
1815 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1816 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001817 ret = 1;
1818 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001819 }
1820 }
1821 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreauf965b2a2020-12-01 10:47:18 +01001822
1823 /* some codes are not for real errors, just attempts to close cleanly */
1824 switch (h2c->errcode) {
1825 case H2_ERR_NO_ERROR:
1826 case H2_ERR_ENHANCE_YOUR_CALM:
1827 case H2_ERR_REFUSED_STREAM:
1828 case H2_ERR_CANCEL:
1829 break;
1830 default:
Willy Tarreau4781b152021-04-06 13:53:36 +02001831 HA_ATOMIC_INC(&h2c->px_counters->goaway_resp);
Willy Tarreauf965b2a2020-12-01 10:47:18 +01001832 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001833 out:
1834 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001835 return ret;
1836}
1837
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001838/* Try to send an RST_STREAM frame on the connection for the indicated stream
1839 * during mux operations. This stream must be valid and cannot be closed
1840 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1841 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1842 * not yet.
1843 *
1844 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1845 * to write the message, it subscribes the stream to future notifications.
1846 */
1847static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1848{
1849 struct buffer *res;
1850 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001851 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001852
Willy Tarreau7838a792019-08-12 18:42:03 +02001853 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1854
1855 if (!h2s || h2s->st == H2_SS_CLOSED) {
1856 ret = 1;
1857 goto out;
1858 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001859
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001860 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1861 * RST_STREAM in response to a RST_STREAM frame.
1862 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001863 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001864 ret = 1;
1865 goto ignore;
1866 }
1867
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001868 if (h2c_mux_busy(h2c, h2s)) {
1869 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001870 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001871 }
1872
Willy Tarreau9c218e72019-05-26 10:08:28 +02001873 /* len: 4, type: 3, flags: none */
1874 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1875 write_n32(str + 5, h2s->id);
1876 write_n32(str + 9, h2s->errcode);
1877
Willy Tarreaubcc45952019-05-26 10:05:50 +02001878 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001879 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001880 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001881 h2c->flags |= H2_CF_MUX_MALLOC;
1882 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001883 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001884 }
1885
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001886 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001887 if (unlikely(ret <= 0)) {
1888 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001889 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1890 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001891 h2c->flags |= H2_CF_MUX_MFULL;
1892 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001893 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001894 }
1895 else {
1896 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001897 ret = 0;
1898 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001899 }
1900 }
1901
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001902 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001903 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001904 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001905 out:
1906 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001907 return ret;
1908}
1909
1910/* Try to send an RST_STREAM frame on the connection for the stream being
1911 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001912 * error code, even if the stream is one of the dummy ones, and will update
1913 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001914 *
1915 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1916 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001917 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001918 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001919 */
1920static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1921{
1922 struct buffer *res;
1923 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001924 int ret = 0;
1925
1926 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001927
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001928 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1929 * RST_STREAM in response to a RST_STREAM frame.
1930 */
1931 if (h2c->dft == H2_FT_RST_STREAM) {
1932 ret = 1;
1933 goto ignore;
1934 }
1935
Willy Tarreau27a84c92017-10-17 08:10:17 +02001936 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001937 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001938 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001939 }
1940
Willy Tarreau9c218e72019-05-26 10:08:28 +02001941 /* len: 4, type: 3, flags: none */
1942 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1943
1944 write_n32(str + 5, h2c->dsi);
1945 write_n32(str + 9, h2s->errcode);
1946
Willy Tarreaubcc45952019-05-26 10:05:50 +02001947 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001948 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001949 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001950 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001951 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001952 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001953 }
1954
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001955 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001956 if (unlikely(ret <= 0)) {
1957 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001958 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1959 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001960 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001961 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001962 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001963 }
1964 else {
1965 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001966 ret = 0;
1967 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001968 }
1969 }
1970
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001971 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001972 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001973 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001974 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001975 }
1976
Willy Tarreau7838a792019-08-12 18:42:03 +02001977 out:
Willy Tarreau4781b152021-04-06 13:53:36 +02001978 HA_ATOMIC_INC(&h2c->px_counters->rst_stream_resp);
Willy Tarreau7838a792019-08-12 18:42:03 +02001979 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001980 return ret;
1981}
1982
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001983/* try to send an empty DATA frame with the ES flag set to notify about the
1984 * end of stream and match a shutdown(write). If an ES was already sent as
1985 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1986 * on success or zero if nothing was done. In case of lack of room to write the
1987 * message, it subscribes the requesting stream to future notifications.
1988 */
1989static int h2_send_empty_data_es(struct h2s *h2s)
1990{
1991 struct h2c *h2c = h2s->h2c;
1992 struct buffer *res;
1993 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001994 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001995
Willy Tarreau7838a792019-08-12 18:42:03 +02001996 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1997
1998 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1999 ret = 1;
2000 goto out;
2001 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002002
2003 if (h2c_mux_busy(h2c, h2s)) {
2004 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002005 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002006 }
2007
Willy Tarreau9c218e72019-05-26 10:08:28 +02002008 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
2009 memcpy(str, "\x00\x00\x00\x00\x01", 5);
2010 write_n32(str + 5, h2s->id);
2011
Willy Tarreaubcc45952019-05-26 10:05:50 +02002012 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002013 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002014 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002015 h2c->flags |= H2_CF_MUX_MALLOC;
2016 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002017 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002018 }
2019
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002020 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002021 if (likely(ret > 0)) {
2022 h2s->flags |= H2_SF_ES_SENT;
2023 }
2024 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002025 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2026 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002027 h2c->flags |= H2_CF_MUX_MFULL;
2028 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002029 }
2030 else {
2031 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002032 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002033 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002034 out:
2035 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002036 return ret;
2037}
2038
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002039/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002040 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002041 * is automatically updated accordingly. If the stream is orphaned, it is
2042 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01002043 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002044static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01002045{
Willy Tarreau7838a792019-08-12 18:42:03 +02002046 struct h2c *h2c = h2s->h2c;
2047
2048 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
2049
Christopher Fauletf02ca002019-03-07 16:21:34 +01002050 if (!h2s->cs) {
2051 /* this stream was already orphaned */
2052 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002053 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002054 return;
2055 }
2056
Christopher Fauletaade4ed2020-10-08 15:38:41 +02002057 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002058 if (h2s->st == H2_SS_OPEN)
2059 h2s->st = H2_SS_HREM;
2060 else if (h2s->st == H2_SS_HLOC)
2061 h2s_close(h2s);
2062 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002063
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002064 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
2065 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
2066 h2s->cs->flags |= CS_FL_ERR_PENDING;
2067 if (h2s->cs->flags & CS_FL_EOS)
2068 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02002069
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002070 if (h2s->st < H2_SS_ERROR)
2071 h2s->st = H2_SS_ERROR;
2072 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01002073
2074 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002075 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002076}
2077
2078/* wake the streams attached to the connection, whose id is greater than <last>
2079 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002080 */
Willy Tarreau23482912019-05-07 15:23:14 +02002081static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002082{
2083 struct eb32_node *node;
2084 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002085
Willy Tarreau7838a792019-08-12 18:42:03 +02002086 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
2087
Christopher Fauletf02ca002019-03-07 16:21:34 +01002088 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002089 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
2090 while (node) {
2091 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002092 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002093 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002094 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01002095
Christopher Fauletf02ca002019-03-07 16:21:34 +01002096 /* Wake all streams with unassigned ID (ID == 0) */
2097 node = eb32_lookup(&h2c->streams_by_id, 0);
2098 while (node) {
2099 h2s = container_of(node, struct h2s, by_id);
2100 if (h2s->id > 0)
2101 break;
2102 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002103 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002104 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002105
2106 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002107}
2108
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002109/* Wake up all blocked streams whose window size has become positive after the
2110 * mux's initial window was adjusted. This should be done after having processed
2111 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002112 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002113static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02002114{
2115 struct h2s *h2s;
2116 struct eb32_node *node;
2117
Willy Tarreau7838a792019-08-12 18:42:03 +02002118 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2119
Willy Tarreau3421aba2017-07-27 15:41:03 +02002120 node = eb32_first(&h2c->streams_by_id);
2121 while (node) {
2122 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002123 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002124 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002125 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002126 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2127 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreau2b718102021-04-21 07:32:39 +02002128 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002129 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002130 node = eb32_next(node);
2131 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002132
2133 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002134}
2135
2136/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
2137 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01002138 * return an error in h2c. The caller must have already verified frame length
2139 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002140 */
2141static int h2c_handle_settings(struct h2c *h2c)
2142{
2143 unsigned int offset;
2144 int error;
2145
Willy Tarreau7838a792019-08-12 18:42:03 +02002146 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2147
Willy Tarreau3421aba2017-07-27 15:41:03 +02002148 if (h2c->dff & H2_F_SETTINGS_ACK) {
2149 if (h2c->dfl) {
2150 error = H2_ERR_FRAME_SIZE_ERROR;
2151 goto fail;
2152 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002153 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002154 }
2155
Willy Tarreau3421aba2017-07-27 15:41:03 +02002156 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002157 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002158 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002159
2160 /* parse the frame */
2161 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002162 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2163 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002164
2165 switch (type) {
2166 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2167 /* we need to update all existing streams with the
2168 * difference from the previous iws.
2169 */
2170 if (arg < 0) { // RFC7540#6.5.2
2171 error = H2_ERR_FLOW_CONTROL_ERROR;
2172 goto fail;
2173 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002174 h2c->miw = arg;
2175 break;
2176 case H2_SETTINGS_MAX_FRAME_SIZE:
2177 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002178 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 +02002179 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002180 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002181 goto fail;
2182 }
2183 h2c->mfs = arg;
2184 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002185 case H2_SETTINGS_ENABLE_PUSH:
2186 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002187 TRACE_ERROR("ENABLE_PUSH out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002188 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002189 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002190 goto fail;
2191 }
2192 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002193 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2194 if (h2c->flags & H2_CF_IS_BACK) {
2195 /* the limit is only for the backend; for the frontend it is our limit */
2196 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2197 arg = h2_settings_max_concurrent_streams;
2198 h2c->streams_limit = arg;
2199 }
2200 break;
Amaury Denoyellef9dcbee2020-12-11 17:53:10 +01002201 case H2_SETTINGS_ENABLE_CONNECT_PROTOCOL:
2202 /* nothing to do here as this settings is automatically
2203 * transmits to the client */
2204 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002205 }
2206 }
2207
2208 /* need to ACK this frame now */
2209 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002210 done:
2211 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002212 return 1;
2213 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002214 if (!(h2c->flags & H2_CF_IS_BACK))
2215 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002216 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002217 out0:
2218 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 +02002219 return 0;
2220}
2221
2222/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2223 * success or one of the h2_status values.
2224 */
2225static int h2c_ack_settings(struct h2c *h2c)
2226{
2227 struct buffer *res;
2228 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002229 int ret = 0;
2230
2231 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002232
2233 if (h2c_mux_busy(h2c, NULL)) {
2234 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002235 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002236 }
2237
Willy Tarreau9c218e72019-05-26 10:08:28 +02002238 memcpy(str,
2239 "\x00\x00\x00" /* length : 0 (no data) */
2240 "\x04" "\x01" /* type : 4, flags : ACK */
2241 "\x00\x00\x00\x00" /* stream ID */, 9);
2242
Willy Tarreaubcc45952019-05-26 10:05:50 +02002243 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002244 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002245 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002246 h2c->flags |= H2_CF_MUX_MALLOC;
2247 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002248 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002249 }
2250
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002251 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002252 if (unlikely(ret <= 0)) {
2253 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002254 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2255 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002256 h2c->flags |= H2_CF_MUX_MFULL;
2257 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002258 }
2259 else {
2260 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002261 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002262 }
2263 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002264 out:
2265 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002266 return ret;
2267}
2268
Willy Tarreaucf68c782017-10-10 17:11:41 +02002269/* processes a PING frame and schedules an ACK if needed. The caller must pass
2270 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002271 * missing data. The caller must have already verified frame length
2272 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002273 */
2274static int h2c_handle_ping(struct h2c *h2c)
2275{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002276 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002277 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002278 h2c->st0 = H2_CS_FRAME_A;
2279 return 1;
2280}
2281
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002282/* Try to send a window update for stream id <sid> and value <increment>.
2283 * Returns > 0 on success or zero on missing room or failure. It may return an
2284 * error in h2c.
2285 */
2286static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2287{
2288 struct buffer *res;
2289 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002290 int ret = 0;
2291
2292 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002293
2294 if (h2c_mux_busy(h2c, NULL)) {
2295 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002296 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002297 }
2298
Willy Tarreau9c218e72019-05-26 10:08:28 +02002299 /* length: 4, type: 8, flags: none */
2300 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2301 write_n32(str + 5, sid);
2302 write_n32(str + 9, increment);
2303
Willy Tarreaubcc45952019-05-26 10:05:50 +02002304 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002305 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002306 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002307 h2c->flags |= H2_CF_MUX_MALLOC;
2308 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002309 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002310 }
2311
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002312 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002313 if (unlikely(ret <= 0)) {
2314 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002315 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2316 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002317 h2c->flags |= H2_CF_MUX_MFULL;
2318 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002319 }
2320 else {
2321 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002322 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002323 }
2324 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002325 out:
2326 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002327 return ret;
2328}
2329
2330/* try to send pending window update for the connection. It's safe to call it
2331 * with no pending updates. Returns > 0 on success or zero on missing room or
2332 * failure. It may return an error in h2c.
2333 */
2334static int h2c_send_conn_wu(struct h2c *h2c)
2335{
2336 int ret = 1;
2337
Willy Tarreau7838a792019-08-12 18:42:03 +02002338 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2339
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002340 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002341 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002342
Willy Tarreau97aaa672018-12-23 09:49:04 +01002343 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2344 /* increase the advertised connection window to 2G on
2345 * first update.
2346 */
2347 h2c->flags |= H2_CF_WINDOW_OPENED;
2348 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2349 }
2350
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002351 /* send WU for the connection */
2352 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2353 if (ret > 0)
2354 h2c->rcvd_c = 0;
2355
Willy Tarreau7838a792019-08-12 18:42:03 +02002356 out:
2357 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002358 return ret;
2359}
2360
2361/* try to send pending window update for the current dmux stream. It's safe to
2362 * call it with no pending updates. Returns > 0 on success or zero on missing
2363 * room or failure. It may return an error in h2c.
2364 */
2365static int h2c_send_strm_wu(struct h2c *h2c)
2366{
2367 int ret = 1;
2368
Willy Tarreau7838a792019-08-12 18:42:03 +02002369 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2370
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002371 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002372 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002373
2374 /* send WU for the stream */
2375 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2376 if (ret > 0)
2377 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002378 out:
2379 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002380 return ret;
2381}
2382
Willy Tarreaucf68c782017-10-10 17:11:41 +02002383/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2384 * success, 0 on missing data or one of the h2_status values.
2385 */
2386static int h2c_ack_ping(struct h2c *h2c)
2387{
2388 struct buffer *res;
2389 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002390 int ret = 0;
2391
2392 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002393
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002394 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002395 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002396
2397 if (h2c_mux_busy(h2c, NULL)) {
2398 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002399 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002400 }
2401
Willy Tarreaucf68c782017-10-10 17:11:41 +02002402 memcpy(str,
2403 "\x00\x00\x08" /* length : 8 (same payload) */
2404 "\x06" "\x01" /* type : 6, flags : ACK */
2405 "\x00\x00\x00\x00" /* stream ID */, 9);
2406
2407 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002408 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002409
Willy Tarreau9c218e72019-05-26 10:08:28 +02002410 res = br_tail(h2c->mbuf);
2411 retry:
2412 if (!h2_get_buf(h2c, res)) {
2413 h2c->flags |= H2_CF_MUX_MALLOC;
2414 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002415 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002416 }
2417
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002418 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002419 if (unlikely(ret <= 0)) {
2420 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002421 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2422 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002423 h2c->flags |= H2_CF_MUX_MFULL;
2424 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002425 }
2426 else {
2427 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002428 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002429 }
2430 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002431 out:
2432 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002433 return ret;
2434}
2435
Willy Tarreau26f95952017-07-27 17:18:30 +02002436/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2437 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002438 * h2c or h2s. The caller must have already verified frame length and stream ID
2439 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002440 */
2441static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2442{
2443 int32_t inc;
2444 int error;
2445
Willy Tarreau7838a792019-08-12 18:42:03 +02002446 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2447
Willy Tarreau26f95952017-07-27 17:18:30 +02002448 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002449 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002450 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002451
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002452 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002453
2454 if (h2c->dsi != 0) {
2455 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002456
2457 /* it's not an error to receive WU on a closed stream */
2458 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002459 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002460
2461 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002462 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 +02002463 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002464 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002465 goto strm_err;
2466 }
2467
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002468 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002469 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 +02002470 error = H2_ERR_FLOW_CONTROL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002471 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002472 goto strm_err;
2473 }
2474
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002475 h2s->sws += inc;
2476 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002477 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002478 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002479 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2480 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreau2b718102021-04-21 07:32:39 +02002481 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002482 }
2483 }
2484 else {
2485 /* connection window update */
2486 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002487 TRACE_ERROR("conn WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002488 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002489 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau26f95952017-07-27 17:18:30 +02002490 goto conn_err;
2491 }
2492
2493 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2494 error = H2_ERR_FLOW_CONTROL_ERROR;
2495 goto conn_err;
2496 }
2497
2498 h2c->mws += inc;
2499 }
2500
Willy Tarreau7838a792019-08-12 18:42:03 +02002501 done:
2502 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002503 return 1;
2504
2505 conn_err:
2506 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002507 out0:
2508 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 +02002509 return 0;
2510
2511 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002512 h2s_error(h2s, error);
2513 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002514 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002515 return 0;
2516}
2517
Willy Tarreaue96b0922017-10-30 00:28:29 +01002518/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002519 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2520 * have already verified frame length and stream ID validity. Described in
2521 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002522 */
2523static int h2c_handle_goaway(struct h2c *h2c)
2524{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002525 int last;
2526
Willy Tarreau7838a792019-08-12 18:42:03 +02002527 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002528 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002529 if (b_data(&h2c->dbuf) < h2c->dfl) {
2530 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002531 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002532 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002533
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002534 last = h2_get_n32(&h2c->dbuf, 0);
2535 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002536 if (h2c->last_sid < 0)
2537 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002538 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002539 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002540 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002541}
2542
Willy Tarreau92153fc2017-12-03 19:46:19 +01002543/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002544 * invalid. Returns > 0 on success or zero on missing data. It may return an
2545 * error in h2c. The caller must have already verified frame length and stream
2546 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002547 */
2548static int h2c_handle_priority(struct h2c *h2c)
2549{
Willy Tarreau7838a792019-08-12 18:42:03 +02002550 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2551
Willy Tarreau92153fc2017-12-03 19:46:19 +01002552 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002553 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002554 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002555 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002556 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002557
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002558 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002559 /* 7540#5.3 : can't depend on itself */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002560 TRACE_ERROR("PRIORITY depends on itself", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002561 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02002562 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002563 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002564 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002565 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002566 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002567 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002568}
2569
Willy Tarreaucd234e92017-08-18 10:59:39 +02002570/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002571 * Returns > 0 on success or zero on missing data. The caller must have already
2572 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002573 */
2574static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2575{
Willy Tarreau7838a792019-08-12 18:42:03 +02002576 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2577
Willy Tarreaucd234e92017-08-18 10:59:39 +02002578 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002579 if (b_data(&h2c->dbuf) < h2c->dfl) {
2580 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002581 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002582 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002583
2584 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002585 if (h2s->st == H2_SS_CLOSED) {
2586 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 +02002587 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002588 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002589
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002590 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002591 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002592
2593 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002594 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002595 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002596 }
2597
2598 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002599 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002600 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002601}
2602
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002603/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2604 * It may return an error in h2c or h2s. The caller must consider that the
2605 * return value is the new h2s in case one was allocated (most common case).
2606 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002607 * errors here are reported as connection errors since it's impossible to
2608 * recover from such errors after the compression context has been altered.
2609 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002610static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002611{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002612 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002613 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002614 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002615 int error;
2616
Willy Tarreau7838a792019-08-12 18:42:03 +02002617 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2618
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002619 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002620 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002621
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002622 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002623 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002624
2625 /* now either the frame is complete or the buffer is complete */
2626 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002627 /* The stream exists/existed, this must be a trailers frame */
2628 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002629 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len, NULL);
Willy Tarreauaab1a602019-05-06 11:12:18 +02002630 /* unrecoverable error ? */
2631 if (h2c->st0 >= H2_CS_ERROR)
2632 goto out;
2633
2634 if (error == 0)
2635 goto out; // missing data
2636
2637 if (error < 0) {
2638 /* Failed to decode this frame (e.g. too large request)
2639 * but the HPACK decompressor is still synchronized.
2640 */
2641 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2642 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002643 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002644 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002645 goto done;
2646 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002647 /* the connection was already killed by an RST, let's consume
2648 * the data and send another RST.
2649 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002650 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau1f035502019-01-30 11:44:07 +01002651 h2s = (struct h2s*)h2_error_stream;
2652 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002653 }
2654 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2655 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2656 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002657 TRACE_ERROR("HEADERS on invalid stream ID", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau4781b152021-04-06 13:53:36 +02002658 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002659 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002660 goto conn_err;
2661 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002662 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2663 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002664
Amaury Denoyelle74162742020-12-11 17:53:05 +01002665 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002666
Willy Tarreau25919232019-01-03 14:48:18 +01002667 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002668 if (h2c->st0 >= H2_CS_ERROR)
2669 goto out;
2670
Willy Tarreau25919232019-01-03 14:48:18 +01002671 if (error <= 0) {
2672 if (error == 0)
2673 goto out; // missing data
2674
2675 /* Failed to decode this stream (e.g. too large request)
2676 * but the HPACK decompressor is still synchronized.
2677 */
2678 h2s = (struct h2s*)h2_error_stream;
2679 goto send_rst;
2680 }
2681
Willy Tarreau22de8d32018-09-05 19:55:58 +02002682 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002683 * positively from h2c_frt_stream_new(), the stream will report the error,
2684 * and if we return in error, h2c_frt_stream_new() will emit the error.
Christopher Faulet7d013e72020-12-15 16:56:50 +01002685 *
2686 * Xfer the rxbuf to the stream. On success, the new stream owns the
2687 * rxbuf. On error, it is released here.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002688 */
Christopher Faulet7d013e72020-12-15 16:56:50 +01002689 h2s = h2c_frt_stream_new(h2c, h2c->dsi, &rxbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02002690 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002691 h2s = (struct h2s*)h2_refused_stream;
2692 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002693 }
2694
2695 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002696 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002697 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002698
Willy Tarreau88d138e2019-01-02 19:38:14 +01002699 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002700 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002701 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002702
2703 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002704 if (h2s->st == H2_SS_OPEN)
2705 h2s->st = H2_SS_HREM;
2706 else
2707 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002708 }
2709
Willy Tarreau3a429f02019-01-03 11:41:50 +01002710 /* update the max stream ID if the request is being processed */
2711 if (h2s->id > h2c->max_id)
2712 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002713
Willy Tarreau022e5e52020-09-10 09:33:15 +02002714 TRACE_USER("rcvd H2 request ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW, h2c->conn, 0, &rxbuf);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002715 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002716
2717 conn_err:
2718 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002719 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002720
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002721 out:
2722 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002723 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 +01002724 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002725
2726 send_rst:
2727 /* make the demux send an RST for the current stream. We may only
2728 * do this if we're certain that the HEADERS frame was properly
2729 * decompressed so that the HPACK decoder is still kept up to date.
2730 */
2731 h2_release_buf(h2c, &rxbuf);
2732 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002733
Willy Tarreau022e5e52020-09-10 09:33:15 +02002734 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 +02002735 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002736 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002737}
2738
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002739/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2740 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2741 * errors here are reported as connection errors since it's impossible to
2742 * recover from such errors after the compression context has been altered.
2743 */
2744static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2745{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002746 struct buffer rxbuf = BUF_NULL;
2747 unsigned long long body_len = 0;
2748 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002749 int error;
2750
Willy Tarreau7838a792019-08-12 18:42:03 +02002751 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2752
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002753 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002754 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002755
2756 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002757 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002758
Christopher Faulet6884aa32019-09-23 15:28:20 +02002759 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002760 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len, h2s->upgrade_protocol);
Christopher Faulet6884aa32019-09-23 15:28:20 +02002761 }
2762 else {
2763 /* the connection was already killed by an RST, let's consume
2764 * the data and send another RST.
2765 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002766 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002767 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002768 h2c->st0 = H2_CS_FRAME_E;
2769 goto send_rst;
2770 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002771
Willy Tarreau25919232019-01-03 14:48:18 +01002772 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002773 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002774 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002775
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002776 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2777 /* RFC7540#5.1 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002778 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 +01002779 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2780 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau4781b152021-04-06 13:53:36 +02002781 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002782 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002783 }
2784
Willy Tarreau25919232019-01-03 14:48:18 +01002785 if (error <= 0) {
2786 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002787 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002788
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002789 /* stream error : send RST_STREAM */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002790 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 +01002791 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002792 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau4781b152021-04-06 13:53:36 +02002793 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002794 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002795 }
2796
Christopher Fauletfa922f02019-05-07 10:55:17 +02002797 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002798 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002799
Willy Tarreau927b88b2019-03-04 08:03:25 +01002800 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002801 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002802 else if (h2s->flags & H2_SF_ES_RCVD) {
2803 if (h2s->st == H2_SS_OPEN)
2804 h2s->st = H2_SS_HREM;
2805 else if (h2s->st == H2_SS_HLOC)
2806 h2s_close(h2s);
2807 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002808
Christopher Fauletf95f8762021-01-22 11:59:07 +01002809 /* Unblock busy server h2s waiting for the response headers to validate
2810 * the tunnel establishment or the end of the response of an oborted
2811 * tunnel
2812 */
2813 if ((h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY)) == (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY) ||
2814 (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)) {
2815 TRACE_STATE("Unblock h2s blocked on tunnel establishment/abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2816 h2s->flags &= ~H2_SF_BLK_MBUSY;
2817 }
2818
Willy Tarreau022e5e52020-09-10 09:33:15 +02002819 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 +02002820 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002821 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002822 fail:
2823 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2824 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002825
2826 send_rst:
2827 /* make the demux send an RST for the current stream. We may only
2828 * do this if we're certain that the HEADERS frame was properly
2829 * decompressed so that the HPACK decoder is still kept up to date.
2830 */
2831 h2_release_buf(h2c, &rxbuf);
2832 h2c->st0 = H2_CS_FRAME_E;
2833
Willy Tarreau022e5e52020-09-10 09:33:15 +02002834 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 +02002835 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2836 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002837}
2838
Willy Tarreau454f9052017-10-26 19:40:35 +02002839/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2840 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2841 */
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01002842static int h2c_handle_data(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02002843{
2844 int error;
2845
Willy Tarreau7838a792019-08-12 18:42:03 +02002846 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2847
Willy Tarreau454f9052017-10-26 19:40:35 +02002848 /* note that empty DATA frames are perfectly valid and sometimes used
2849 * to signal an end of stream (with the ES flag).
2850 */
2851
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002852 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002853 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002854
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002855 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002856 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002857
2858 /* now either the frame is complete or the buffer is complete */
2859
Willy Tarreau454f9052017-10-26 19:40:35 +02002860 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2861 /* RFC7540#6.1 */
2862 error = H2_ERR_STREAM_CLOSED;
2863 goto strm_err;
2864 }
2865
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002866 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002867 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002868 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 +01002869 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002870 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002871 goto strm_err;
2872 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01002873 if (!(h2c->flags & H2_CF_IS_BACK) &&
2874 (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT) &&
2875 ((h2c->dfl - h2c->dpl) || !(h2c->dff & H2_F_DATA_END_STREAM))) {
2876 /* a tunnel attempt was aborted but the client still try to send some raw data.
2877 * Thus the stream is closed with the CANCEL error. Here we take care it is not
2878 * an empty DATA Frame with the ES flag. The error is only handled if ES was
2879 * already sent to the client because depending on the scheduling, these data may
Ilya Shipitsinacf84592021-02-06 22:29:08 +05002880 * have been sent before the server response but not handle here.
Christopher Faulet91b21dc2021-01-22 12:13:15 +01002881 */
2882 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2883 error = H2_ERR_CANCEL;
2884 goto strm_err;
2885 }
Willy Tarreau1915ca22019-01-24 11:49:37 +01002886
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002887 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002888 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002889
Willy Tarreau454f9052017-10-26 19:40:35 +02002890 /* call the upper layers to process the frame, then let the upper layer
2891 * notify the stream about any change.
2892 */
2893 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002894 /* The upper layer has already closed, this may happen on
2895 * 4xx/redirects during POST, or when receiving a response
2896 * from an H2 server after the client has aborted.
2897 */
2898 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002899 goto strm_err;
2900 }
2901
Willy Tarreau8f650c32017-11-21 19:36:21 +01002902 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002903 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002904
Willy Tarreau721c9742017-11-07 11:05:42 +01002905 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002906 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002907 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002908 }
2909
2910 /* check for completion : the callee will change this to FRAME_A or
2911 * FRAME_H once done.
2912 */
2913 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002914 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002915
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002916 /* last frame */
2917 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002918 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002919 if (h2s->st == H2_SS_OPEN)
2920 h2s->st = H2_SS_HREM;
2921 else
2922 h2s_close(h2s);
2923
Willy Tarreau1915ca22019-01-24 11:49:37 +01002924 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2925 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002926 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 +01002927 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau4781b152021-04-06 13:53:36 +02002928 HA_ATOMIC_INC(&h2c->px_counters->strm_proto_err);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002929 goto strm_err;
2930 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002931 }
2932
Christopher Fauletf95f8762021-01-22 11:59:07 +01002933 /* Unblock busy server h2s waiting for the end of the response for an
2934 * aborted tunnel
2935 */
2936 if ((h2c->flags & H2_CF_IS_BACK) &&
2937 (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)) {
2938 TRACE_STATE("Unblock h2s blocked on tunnel abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2939 h2s->flags &= ~H2_SF_BLK_MBUSY;
2940 }
2941
Willy Tarreau7838a792019-08-12 18:42:03 +02002942 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002943 return 1;
2944
Willy Tarreau454f9052017-10-26 19:40:35 +02002945 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002946 h2s_error(h2s, error);
2947 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002948 fail:
2949 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 +02002950 return 0;
2951}
2952
Willy Tarreau63864812019-08-07 14:25:20 +02002953/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2954 * valid for the current stream state. This is needed only after parsing the
2955 * frame header but in practice it can be performed at any time during
2956 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2957 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2958 */
2959static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2960{
Willy Tarreau7838a792019-08-12 18:42:03 +02002961 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2962
Willy Tarreau63864812019-08-07 14:25:20 +02002963 if (h2s->st == H2_SS_IDLE &&
2964 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2965 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2966 * this state MUST be treated as a connection error
2967 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002968 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 +02002969 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002970 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002971 /* only log if no other stream can report the error */
2972 sess_log(h2c->conn->owner);
2973 }
Willy Tarreau4781b152021-04-06 13:53:36 +02002974 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7838a792019-08-12 18:42:03 +02002975 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 +02002976 return 0;
2977 }
2978
Willy Tarreau57a18162019-11-24 14:57:53 +01002979 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2980 /* only PUSH_PROMISE would be permitted here */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002981 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 +01002982 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02002983 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau57a18162019-11-24 14:57:53 +01002984 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2985 return 0;
2986 }
2987
Willy Tarreau63864812019-08-07 14:25:20 +02002988 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2989 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2990 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2991 * this state MUST be treated as a stream error.
2992 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2993 * PUSH_PROMISE/CONTINUATION cause connection errors.
2994 */
Amaury Denoyellea8879232020-10-27 17:16:03 +01002995 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002996 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 +02002997 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02002998 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002999 }
3000 else {
Willy Tarreau63864812019-08-07 14:25:20 +02003001 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003002 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003003 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 +02003004 return 0;
3005 }
3006
3007 /* Below the management of frames received in closed state is a
3008 * bit hackish because the spec makes strong differences between
3009 * streams closed by receiving RST, sending RST, and seeing ES
3010 * in both directions. In addition to this, the creation of a
3011 * new stream reusing the identifier of a closed one will be
3012 * detected here. Given that we cannot keep track of all closed
3013 * streams forever, we consider that unknown closed streams were
3014 * closed on RST received, which allows us to respond with an
3015 * RST without breaking the connection (eg: to abort a transfer).
3016 * Some frames have to be silently ignored as well.
3017 */
3018 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
3019 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
3020 /* #5.1.1: The identifier of a newly
3021 * established stream MUST be numerically
3022 * greater than all streams that the initiating
3023 * endpoint has opened or reserved. This
3024 * governs streams that are opened using a
3025 * HEADERS frame and streams that are reserved
3026 * using PUSH_PROMISE. An endpoint that
3027 * receives an unexpected stream identifier
3028 * MUST respond with a connection error.
3029 */
3030 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003031 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 +02003032 return 0;
3033 }
3034
Willy Tarreau4c08f122019-09-26 08:47:15 +02003035 if (h2s->flags & H2_SF_RST_RCVD &&
3036 !(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 +02003037 /* RFC7540#5.1:closed: an endpoint that
3038 * receives any frame other than PRIORITY after
3039 * receiving a RST_STREAM MUST treat that as a
3040 * stream error of type STREAM_CLOSED.
3041 *
3042 * Note that old streams fall into this category
3043 * and will lead to an RST being sent.
3044 *
3045 * However, we cannot generalize this to all frame types. Those
3046 * carrying compression state must still be processed before
3047 * being dropped or we'll desynchronize the decoder. This can
3048 * happen with request trailers received after sending an
3049 * RST_STREAM, or with header/trailers responses received after
3050 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02003051 *
3052 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003053 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02003054 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02003055 */
3056 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
3057 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02003058 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 +02003059 return 0;
3060 }
3061
3062 /* RFC7540#5.1:closed: if this state is reached as a
3063 * result of sending a RST_STREAM frame, the peer that
3064 * receives the RST_STREAM might have already sent
3065 * frames on the stream that cannot be withdrawn. An
3066 * endpoint MUST ignore frames that it receives on
3067 * closed streams after it has sent a RST_STREAM
3068 * frame. An endpoint MAY choose to limit the period
3069 * over which it ignores frames and treat frames that
3070 * arrive after this time as being in error.
3071 */
3072 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
3073 /* RFC7540#5.1:closed: any frame other than
3074 * PRIO/WU/RST in this state MUST be treated as
3075 * a connection error
3076 */
3077 if (h2c->dft != H2_FT_RST_STREAM &&
3078 h2c->dft != H2_FT_PRIORITY &&
3079 h2c->dft != H2_FT_WINDOW_UPDATE) {
3080 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003081 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 +02003082 return 0;
3083 }
3084 }
3085 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003086 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003087 return 1;
3088}
3089
Willy Tarreaubc933932017-10-09 16:21:43 +02003090/* process Rx frames to be demultiplexed */
3091static void h2_process_demux(struct h2c *h2c)
3092{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003093 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003094 struct h2_fh hdr;
3095 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003096 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02003097
Willy Tarreau7838a792019-08-12 18:42:03 +02003098 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3099
Willy Tarreau081d4722017-05-16 21:51:05 +02003100 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02003101 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02003102
3103 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3104 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003105 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02003106 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02003107 goto out;
3108
Willy Tarreau52eed752017-09-22 15:05:09 +02003109 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
3110 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003111 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003112 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003113 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02003114 sess_log(h2c->conn->owner);
3115 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003116 goto fail;
3117 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003118 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003119
3120 h2c->max_id = 0;
3121 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003122 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003123 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003124
3125 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003126 /* ensure that what is pending is a valid SETTINGS frame
3127 * without an ACK.
3128 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003129 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 +02003130 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003131 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003132 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003133 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 +02003134 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003135 if (!(h2c->flags & H2_CF_IS_BACK))
3136 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003137 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003138 goto fail;
3139 }
3140
3141 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
3142 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003143 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 +02003144 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3145 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003146 if (!(h2c->flags & H2_CF_IS_BACK))
3147 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003148 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003149 goto fail;
3150 }
3151
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003152 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003153 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003154 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 +02003155 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3156 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003157 if (!(h2c->flags & H2_CF_IS_BACK))
3158 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003159 goto fail;
3160 }
3161
Willy Tarreau3bf69182018-12-21 15:34:50 +01003162 /* that's OK, switch to FRAME_P to process it. This is
3163 * a SETTINGS frame whose header has already been
3164 * deleted above.
3165 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01003166 padlen = 0;
Willy Tarreau4781b152021-04-06 13:53:36 +02003167 HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003168 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003169 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003170 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003171
3172 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02003173 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02003174 int ret = 0;
3175
Willy Tarreau7838a792019-08-12 18:42:03 +02003176 if (!b_data(&h2c->dbuf)) {
3177 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
Willy Tarreau133aaa92021-02-05 12:16:01 +01003178 goto dbuf_empty;
Willy Tarreau7838a792019-08-12 18:42:03 +02003179 }
3180
3181 if (h2c->st0 >= H2_CS_ERROR) {
3182 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003183 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003184 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003185
3186 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02003187 h2c->rcvd_s = 0;
3188
Willy Tarreau7838a792019-08-12 18:42:03 +02003189 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01003190 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02003191 break;
3192
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003193 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003194 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 +02003195 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003196 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02003197 /* only log if no other stream can report the error */
3198 sess_log(h2c->conn->owner);
3199 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003200 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003201 break;
3202 }
3203
Christopher Fauletdd2a5622019-06-18 12:22:38 +02003204 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003205 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
3206 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
3207 * we read the pad length and drop it from the remaining
3208 * payload (one byte + the 9 remaining ones = 10 total
3209 * removed), so we have a frame payload starting after the
3210 * pad len. Flow controlled frames (DATA) also count the
3211 * padlen in the flow control, so it must be adjusted.
3212 */
3213 if (hdr.len < 1) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003214 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 +01003215 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003216 if (!(h2c->flags & H2_CF_IS_BACK))
3217 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003218 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003219 goto fail;
3220 }
3221 hdr.len--;
3222
3223 if (b_data(&h2c->dbuf) < 10)
3224 break; // missing padlen
3225
3226 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3227
3228 if (padlen > hdr.len) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003229 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 +01003230 /* RFC7540#6.1 : pad length = length of
3231 * frame payload or greater => error.
3232 */
3233 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003234 if (!(h2c->flags & H2_CF_IS_BACK))
3235 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003236 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003237 goto fail;
3238 }
3239
3240 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3241 h2c->rcvd_c++;
3242 h2c->rcvd_s++;
3243 }
3244 b_del(&h2c->dbuf, 1);
3245 }
3246 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003247
3248 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003249 h2c->dfl = hdr.len;
3250 h2c->dsi = hdr.sid;
3251 h2c->dft = hdr.ft;
3252 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003253 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003254 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 +02003255 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003256
3257 /* check for minimum basic frame format validity */
3258 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3259 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003260 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 +01003261 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003262 if (!(h2c->flags & H2_CF_IS_BACK))
3263 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003264 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003265 goto fail;
3266 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003267 }
3268
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003269 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3270 * H2_CS_FRAME_P indicates an incomplete previous operation
3271 * (most often the first attempt) and requires some validity
3272 * checks for the frame and the current state. The two other
3273 * ones are set after completion (or abortion) and must skip
3274 * validity checks.
3275 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003276 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3277
Willy Tarreau567beb82018-12-18 16:52:44 +01003278 if (tmp_h2s != h2s && h2s && h2s->cs &&
3279 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003280 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003281 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003282 (h2s->flags & H2_SF_ES_RCVD) ||
3283 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003284 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003285 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 +01003286 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003287 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003288 }
3289 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003290
Willy Tarreau63864812019-08-07 14:25:20 +02003291 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003292 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3293 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003294 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003295 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003296
Willy Tarreau7e98c052017-10-10 15:56:59 +02003297 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003298 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003299 if (h2c->st0 == H2_CS_FRAME_P) {
3300 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003301 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003302 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003303 HA_ATOMIC_INC(&h2c->px_counters->settings_rcvd);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003304
Willy Tarreau7838a792019-08-12 18:42:03 +02003305 if (h2c->st0 == H2_CS_FRAME_A) {
3306 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 +02003307 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003308 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003309 break;
3310
Willy Tarreaucf68c782017-10-10 17:11:41 +02003311 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003312 if (h2c->st0 == H2_CS_FRAME_P) {
3313 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003314 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003315 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003316
Willy Tarreau7838a792019-08-12 18:42:03 +02003317 if (h2c->st0 == H2_CS_FRAME_A) {
3318 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 +02003319 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003320 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003321 break;
3322
Willy Tarreau26f95952017-07-27 17:18:30 +02003323 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003324 if (h2c->st0 == H2_CS_FRAME_P) {
3325 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 +02003326 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003327 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003328 break;
3329
Willy Tarreau61290ec2017-10-17 08:19:21 +02003330 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003331 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003332 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3333 * frames' parsers consume all following CONTINUATION
3334 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003335 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003336 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 +01003337 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003338 if (!(h2c->flags & H2_CF_IS_BACK))
3339 sess_log(h2c->conn->owner);
Willy Tarreau4781b152021-04-06 13:53:36 +02003340 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreauea18f862018-12-22 20:19:26 +01003341 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003342
Willy Tarreau13278b42017-10-13 19:23:14 +02003343 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003344 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003345 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003346 if (h2c->flags & H2_CF_IS_BACK)
3347 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3348 else
3349 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003350 if (tmp_h2s) {
3351 h2s = tmp_h2s;
3352 ret = 1;
3353 }
3354 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003355 HA_ATOMIC_INC(&h2c->px_counters->headers_rcvd);
Willy Tarreau13278b42017-10-13 19:23:14 +02003356 break;
3357
Willy Tarreau454f9052017-10-26 19:40:35 +02003358 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003359 if (h2c->st0 == H2_CS_FRAME_P) {
3360 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01003361 ret = h2c_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003362 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003363 HA_ATOMIC_INC(&h2c->px_counters->data_rcvd);
Willy Tarreau454f9052017-10-26 19:40:35 +02003364
Willy Tarreau7838a792019-08-12 18:42:03 +02003365 if (h2c->st0 == H2_CS_FRAME_A) {
3366 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 +02003367 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003368 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003369 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003370
Willy Tarreau92153fc2017-12-03 19:46:19 +01003371 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003372 if (h2c->st0 == H2_CS_FRAME_P) {
3373 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003374 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003375 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003376 break;
3377
Willy Tarreaucd234e92017-08-18 10:59:39 +02003378 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003379 if (h2c->st0 == H2_CS_FRAME_P) {
3380 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 +02003381 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003382 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003383 HA_ATOMIC_INC(&h2c->px_counters->rst_stream_rcvd);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003384 break;
3385
Willy Tarreaue96b0922017-10-30 00:28:29 +01003386 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003387 if (h2c->st0 == H2_CS_FRAME_P) {
3388 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003389 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003390 }
Willy Tarreau4781b152021-04-06 13:53:36 +02003391 HA_ATOMIC_INC(&h2c->px_counters->goaway_rcvd);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003392 break;
3393
Willy Tarreau1c661982017-10-30 13:52:01 +01003394 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003395 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003396 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003397 /* drop frames that we ignore. They may be larger than
3398 * the buffer so we drain all of their contents until
3399 * we reach the end.
3400 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003401 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3402 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003403 h2c->dfl -= ret;
3404 ret = h2c->dfl == 0;
3405 }
3406
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003407 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003408 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003409 if (h2s->st == H2_SS_ERROR) {
3410 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 +01003411 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003412 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003413
Willy Tarreau7838a792019-08-12 18:42:03 +02003414 if (h2c->st0 == H2_CS_FRAME_E) {
3415 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 +01003416 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003417 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003418
Willy Tarreau133aaa92021-02-05 12:16:01 +01003419 dbuf_empty:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003420 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003421 if (ret <= 0) {
3422 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003423 if (h2c->flags & H2_CF_RCVD_SHUT)
3424 h2c->flags |= H2_CF_END_REACHED;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003425 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003426 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003427
3428 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003429 if (h2c->dfl)
3430 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003431 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3432 b_del(&h2c->dbuf, ret);
3433 h2c->dfl -= ret;
3434 if (!h2c->dfl) {
3435 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3436 h2c->st0 = H2_CS_FRAME_H;
3437 h2c->dsi = -1;
3438 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003439 }
3440 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003441
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003442 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003443 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3444 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003445 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003446 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003447
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003448 done:
Willy Tarreau567beb82018-12-18 16:52:44 +01003449 if (h2s && h2s->cs &&
3450 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003451 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003452 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003453 (h2s->flags & H2_SF_ES_RCVD) ||
3454 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003455 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003456 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 +01003457 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003458 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003459 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003460
Willy Tarreau7838a792019-08-12 18:42:03 +02003461 if (old_iw != h2c->miw) {
3462 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003463 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003464 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003465
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003466 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003467 out:
3468 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003469 return;
3470
3471 fail:
3472 /* we can go here on missing data, blocked response or error, but we
3473 * need to check if we've met a short read condition.
3474 */
3475 if (h2c->flags & H2_CF_RCVD_SHUT)
3476 h2c->flags |= H2_CF_END_REACHED;
3477 goto done;
Willy Tarreaubc933932017-10-09 16:21:43 +02003478}
3479
Willy Tarreau989539b2020-01-10 17:01:29 +01003480/* resume each h2s eligible for sending in list head <head> */
3481static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3482{
3483 struct h2s *h2s, *h2s_back;
3484
3485 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3486
3487 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3488 if (h2c->mws <= 0 ||
3489 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3490 h2c->st0 >= H2_CS_ERROR)
3491 break;
3492
3493 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003494
Willy Tarreaud9464162020-01-10 18:25:07 +01003495 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003496 continue;
3497
Willy Tarreau5723f292020-01-10 15:16:57 +01003498 /* If the sender changed his mind and unsubscribed, let's just
3499 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003500 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003501 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3502 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003503 LIST_DEL_INIT(&h2s->list);
3504 continue;
3505 }
3506
Willy Tarreauf96508a2020-01-10 11:12:48 +01003507 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003508 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003509 tasklet_wakeup(h2s->subs->tasklet);
3510 h2s->subs->events &= ~SUB_RETRY_SEND;
3511 if (!h2s->subs->events)
3512 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003513 }
3514 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3515 tasklet_wakeup(h2s->shut_tl);
3516 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003517 }
3518
3519 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3520}
3521
Willy Tarreaubc933932017-10-09 16:21:43 +02003522/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3523 * the end.
3524 */
3525static int h2_process_mux(struct h2c *h2c)
3526{
Willy Tarreau7838a792019-08-12 18:42:03 +02003527 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3528
Willy Tarreau01b44822018-10-03 14:26:37 +02003529 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3530 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3531 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3532 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003533 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003534 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003535 goto fail;
3536 }
3537 h2c->st0 = H2_CS_SETTINGS1;
3538 }
3539 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003540 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003541 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003542 }
3543
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003544 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003545 if (h2c->rcvd_s > 0 &&
3546 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3547 h2c_send_strm_wu(h2c) < 0)
3548 goto fail;
3549
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003550 if (h2c->rcvd_c > 0 &&
3551 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3552 h2c_send_conn_wu(h2c) < 0)
3553 goto fail;
3554
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003555 /* First we always process the flow control list because the streams
3556 * waiting there were already elected for immediate emission but were
3557 * blocked just on this.
3558 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003559 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3560 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003561
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003562 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003563 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003564 if (h2c->st0 == H2_CS_ERROR) {
3565 if (h2c->max_id >= 0) {
3566 h2c_send_goaway_error(h2c, NULL);
3567 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003568 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003569 }
3570
3571 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3572 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003573 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003574 done:
3575 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3576 return 1;
3577 out0:
3578 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3579 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003580}
3581
Willy Tarreau62f52692017-10-08 23:01:42 +02003582
Willy Tarreau479998a2018-11-18 06:30:59 +01003583/* Attempt to read data, and subscribe if none available.
3584 * The function returns 1 if data has been received, otherwise zero.
3585 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003586static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003587{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003588 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003589 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003590 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003591 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003592
Willy Tarreau7838a792019-08-12 18:42:03 +02003593 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3594
3595 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3596 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003597 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003598 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003599
Willy Tarreau7838a792019-08-12 18:42:03 +02003600 if (!h2_recv_allowed(h2c)) {
3601 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003602 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003603 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003604
Willy Tarreau44e973f2018-03-01 17:49:30 +01003605 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003606 if (!buf) {
3607 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003608 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003609 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003610 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003611
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003612 if (h2c->flags & H2_CF_RCVD_SHUT) {
3613 TRACE_DEVEL("leaving on rcvd_shut", H2_EV_H2C_RECV, h2c->conn);
3614 return 0;
3615 }
3616
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003617 if (!b_data(buf)) {
3618 /* try to pre-align the buffer like the
3619 * rxbufs will be to optimize memory copies. We'll make
3620 * sure that the frame header lands at the end of the
3621 * HTX block to alias it upon recv. We cannot use the
3622 * head because rcv_buf() will realign the buffer if
3623 * it's empty. Thus we cheat and pretend we already
3624 * have a few bytes there.
3625 */
3626 max = buf_room_for_htx_data(buf) + 9;
3627 buf->head = sizeof(struct htx) - 9;
3628 }
3629 else
3630 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003631
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003632 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003633
Christopher Fauletde9d6052021-04-23 12:25:18 +02003634 if (max && !ret && h2_recv_allowed(h2c)) {
3635 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
3636 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003637 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003638 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003639
Christopher Fauletde9d6052021-04-23 12:25:18 +02003640 if (conn_xprt_read0_pending(h2c->conn)) {
3641 TRACE_DATA("received read0", H2_EV_H2C_RECV, h2c->conn);
3642 h2c->flags |= H2_CF_RCVD_SHUT;
3643 }
3644
Olivier Houcharda1411e62018-08-17 18:42:48 +02003645 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003646 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003647 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003648 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003649 }
3650
Willy Tarreau7838a792019-08-12 18:42:03 +02003651 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003652 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003653 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003654 }
3655
3656 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003657 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003658}
3659
Willy Tarreau479998a2018-11-18 06:30:59 +01003660/* Try to send data if possible.
3661 * The function returns 1 if data have been sent, otherwise zero.
3662 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003663static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003664{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003665 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003666 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003667 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003668
Willy Tarreau7838a792019-08-12 18:42:03 +02003669 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003670
Willy Tarreau7838a792019-08-12 18:42:03 +02003671 if (conn->flags & CO_FL_ERROR) {
3672 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3673 return 1;
3674 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003675
Willy Tarreau911db9b2020-01-23 16:27:54 +01003676 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003677 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003678 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003679 }
3680
Willy Tarreaubc933932017-10-09 16:21:43 +02003681 /* This loop is quite simple : it tries to fill as much as it can from
3682 * pending streams into the existing buffer until it's reportedly full
3683 * or the end of send requests is reached. Then it tries to send this
3684 * buffer's contents out, marks it not full if at least one byte could
3685 * be sent, and tries again.
3686 *
3687 * The snd_buf() function normally takes a "flags" argument which may
3688 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3689 * data immediately comes and CO_SFL_STREAMER to indicate that the
3690 * connection is streaming lots of data (used to increase TLS record
3691 * size at the expense of latency). The former can be sent any time
3692 * there's a buffer full flag, as it indicates at least one stream
3693 * attempted to send and failed so there are pending data. An
3694 * alternative would be to set it as long as there's an active stream
3695 * but that would be problematic for ACKs until we have an absolute
3696 * guarantee that all waiters have at least one byte to send. The
3697 * latter should possibly not be set for now.
3698 */
3699
3700 done = 0;
3701 while (!done) {
3702 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003703 unsigned int released = 0;
3704 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003705
3706 /* fill as much as we can into the current buffer */
3707 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3708 done = h2_process_mux(h2c);
3709
Olivier Houchard2b094432019-01-29 18:28:36 +01003710 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003711 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003712
Christopher Faulet9a3d3fc2020-10-22 16:24:58 +02003713 if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) ||
3714 (h2c->st0 == H2_CS_ERROR2) || (h2c->flags & H2_CF_GOAWAY_FAILED))
Willy Tarreaubc933932017-10-09 16:21:43 +02003715 break;
3716
3717 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3718 flags |= CO_SFL_MSG_MORE;
3719
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003720 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3721 if (b_data(buf)) {
3722 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003723 if (!ret) {
3724 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003725 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003726 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003727 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003728 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003729 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003730 if (b_data(buf)) {
3731 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003732 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003733 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003734 }
3735 b_free(buf);
3736 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003737 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003738
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003739 if (released)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01003740 offer_buffers(NULL, released);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003741
Willy Tarreaubc933932017-10-09 16:21:43 +02003742 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003743 if (sent)
3744 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003745 }
3746
Willy Tarreaua2af5122017-10-09 11:56:46 +02003747 if (conn->flags & CO_FL_SOCK_WR_SH) {
3748 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003749 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003750 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003751 /* We're not full anymore, so we can wake any task that are waiting
3752 * for us.
3753 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003754 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3755 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003756
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003757 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003758 if (!br_data(h2c->mbuf)) {
3759 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003760 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003761 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003762schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003763 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3764 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003765 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003766 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003767
Willy Tarreau7838a792019-08-12 18:42:03 +02003768 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003769 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003770}
3771
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003772/* this is the tasklet referenced in h2c->wait_event.tasklet */
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003773struct task *h2_io_cb(struct task *t, void *ctx, unsigned int state)
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003774{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003775 struct connection *conn;
3776 struct tasklet *tl = (struct tasklet *)t;
3777 int conn_in_list;
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003778 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02003779 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003780
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003781 if (state & TASK_F_USR1) {
3782 /* the tasklet was idling on an idle connection, it might have
3783 * been stolen, let's be careful!
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003784 */
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003785 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3786 if (t->context == NULL) {
3787 /* The connection has been taken over by another thread,
3788 * we're no longer responsible for it, so just free the
3789 * tasklet, and do nothing.
3790 */
3791 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3792 tasklet_free(tl);
Willy Tarreau74163142021-03-13 11:30:19 +01003793 t = NULL;
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003794 goto leave;
3795 }
3796 conn = h2c->conn;
3797 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003798
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003799 conn_in_list = conn->flags & CO_FL_LIST_MASK;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003800
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003801 /* Remove the connection from the list, to be sure nobody attempts
3802 * to use it while we handle the I/O events
3803 */
3804 if (conn_in_list)
3805 conn_delete_from_tree(&conn->hash_node->node);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003806
Willy Tarreaue388f2f2021-03-02 16:51:09 +01003807 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3808 } else {
3809 /* we're certain the connection was not in an idle list */
3810 conn = h2c->conn;
3811 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3812 conn_in_list = 0;
3813 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003814
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003815 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003816 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003817 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003818 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003819 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003820 ret = h2_process(h2c);
3821
3822 /* If we were in an idle list, we want to add it back into it,
3823 * unless h2_process() returned -1, which mean it has destroyed
3824 * the connection (testing !ret is enough, if h2_process() wasn't
3825 * called then ret will be 0 anyway.
3826 */
Willy Tarreau74163142021-03-13 11:30:19 +01003827 if (ret < 0)
3828 t = NULL;
3829
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003830 if (!ret && conn_in_list) {
3831 struct server *srv = objt_server(conn->target);
3832
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003833 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003834 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreau430bf4a2021-03-04 09:45:32 +01003835 ebmb_insert(&srv->per_thr[tid].safe_conns, &conn->hash_node->node, sizeof(conn->hash_node->hash));
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003836 else
Willy Tarreau430bf4a2021-03-04 09:45:32 +01003837 ebmb_insert(&srv->per_thr[tid].idle_conns, &conn->hash_node->node, sizeof(conn->hash_node->hash));
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003838 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003839 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003840
Willy Tarreau38468772020-06-28 00:31:13 +02003841leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003842 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreau74163142021-03-13 11:30:19 +01003843 return t;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003844}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003845
Willy Tarreau62f52692017-10-08 23:01:42 +02003846/* callback called on any event by the connection handler.
3847 * It applies changes and returns zero, or < 0 if it wants immediate
3848 * destruction of the connection (which normally doesn not happen in h2).
3849 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003850static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003851{
Olivier Houchard7505f942018-08-21 18:10:44 +02003852 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003853
Willy Tarreau7838a792019-08-12 18:42:03 +02003854 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3855
Willy Tarreauf0961222021-02-05 11:41:46 +01003856 if (!(h2c->flags & H2_CF_DEM_BLOCK_ANY) &&
3857 (b_data(&h2c->dbuf) || (h2c->flags & H2_CF_RCVD_SHUT))) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003858 h2_process_demux(h2c);
3859
3860 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003861 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003862
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003863 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003864 h2c->flags &= ~H2_CF_DEM_DFULL;
3865 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003866 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003867
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003868 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003869 /* frontend is stopping, reload likely in progress, let's try
3870 * to announce a graceful shutdown if not yet done. We don't
3871 * care if it fails, it will be tried again later.
3872 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003873 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003874 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3875 if (h2c->last_sid < 0)
3876 h2c->last_sid = (1U << 31) - 1;
3877 h2c_send_goaway_error(h2c, NULL);
3878 }
3879 }
3880
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003881 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003882 * If we received early data, and the handshake is done, wake
3883 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003884 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003885 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003886 (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 +01003887 struct eb32_node *node;
3888 struct h2s *h2s;
3889
3890 h2c->flags |= H2_CF_WAIT_FOR_HS;
3891 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3892
3893 while (node) {
3894 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003895 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003896 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003897 node = eb32_next(node);
3898 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003899 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003900
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003901 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003902 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3903 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3904 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003905 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003906
3907 if (eb_is_empty(&h2c->streams_by_id)) {
3908 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003909 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003910 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003911 return -1;
3912 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003913
3914 /* connections in error must be removed from the idle lists */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003915 if (conn->flags & CO_FL_LIST_MASK) {
3916 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01003917 conn_delete_from_tree(&conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003918 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3919 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003920 }
3921 else if (h2c->st0 == H2_CS_ERROR) {
3922 /* connections in error must be removed from the idle lists */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003923 if (conn->flags & CO_FL_LIST_MASK) {
3924 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01003925 conn_delete_from_tree(&conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01003926 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
3927 }
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003928 }
3929
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003930 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003931 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003932
Olivier Houchard53216e72018-10-10 15:46:36 +02003933 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3934 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3935 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003936 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003937 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3938 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003939 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003940
Willy Tarreau3f133572017-10-31 19:21:06 +01003941 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003942 if (h2c_may_expire(h2c))
3943 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3944 else
3945 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003946 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003947 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003948
Olivier Houchard7505f942018-08-21 18:10:44 +02003949 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003950 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003951 return 0;
3952}
3953
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003954/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003955static int h2_wake(struct connection *conn)
3956{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003957 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003958 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003959
Willy Tarreau7838a792019-08-12 18:42:03 +02003960 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3961 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003962 if (ret >= 0)
3963 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003964 TRACE_LEAVE(H2_EV_H2C_WAKE);
3965 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003966}
3967
Willy Tarreauea392822017-10-31 10:02:25 +01003968/* Connection timeout management. The principle is that if there's no receipt
3969 * nor sending for a certain amount of time, the connection is closed. If the
3970 * MUX buffer still has lying data or is not allocatable, the connection is
3971 * immediately killed. If it's allocatable and empty, we attempt to send a
3972 * GOAWAY frame.
3973 */
Willy Tarreau144f84a2021-03-02 16:09:26 +01003974struct task *h2_timeout_task(struct task *t, void *context, unsigned int state)
Willy Tarreauea392822017-10-31 10:02:25 +01003975{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003976 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003977 int expired = tick_is_expired(t->expire, now_ms);
3978
Willy Tarreau7838a792019-08-12 18:42:03 +02003979 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3980
Willy Tarreaubd42e922020-06-30 11:19:23 +02003981 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003982 /* Make sure nobody stole the connection from us */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003983 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003984
3985 /* Somebody already stole the connection from us, so we should not
3986 * free it, we just have to free the task.
3987 */
3988 if (!t->context) {
3989 h2c = NULL;
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003990 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003991 goto do_leave;
3992 }
3993
3994
Willy Tarreaubd42e922020-06-30 11:19:23 +02003995 if (!expired) {
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01003996 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003997 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3998 return t;
3999 }
Willy Tarreauea392822017-10-31 10:02:25 +01004000
Willy Tarreaubd42e922020-06-30 11:19:23 +02004001 if (!h2c_may_expire(h2c)) {
4002 /* we do still have streams but all of them are idle, waiting
4003 * for the data layer, so we must not enforce the timeout here.
4004 */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004005 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004006 t->expire = TICK_ETERNITY;
4007 return t;
4008 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004009
Willy Tarreaubd42e922020-06-30 11:19:23 +02004010 /* We're about to destroy the connection, so make sure nobody attempts
4011 * to steal it from us.
4012 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02004013 if (h2c->conn->flags & CO_FL_LIST_MASK)
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004014 conn_delete_from_tree(&h2c->conn->hash_node->node);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004015
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01004016 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004017 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004018
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004019do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02004020 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02004021
4022 if (!h2c) {
4023 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02004024 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02004025 return NULL;
4026 }
4027
4028 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01004029 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02004030 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01004031
Willy Tarreau662fafc2019-05-26 09:43:07 +02004032 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01004033 /* don't even try to send a GOAWAY, the buffer is stuck */
4034 h2c->flags |= H2_CF_GOAWAY_FAILED;
4035 }
4036
4037 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01004038 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01004039 if (h2c_send_goaway_error(h2c, NULL) <= 0)
4040 h2c->flags |= H2_CF_GOAWAY_FAILED;
4041
Willy Tarreau662fafc2019-05-26 09:43:07 +02004042 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004043 unsigned int released = 0;
4044 struct buffer *buf;
4045
4046 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
4047 if (b_data(buf)) {
4048 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
4049 if (!ret)
4050 break;
4051 b_del(buf, ret);
4052 if (b_data(buf))
4053 break;
4054 b_free(buf);
4055 released++;
4056 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02004057 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004058
4059 if (released)
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01004060 offer_buffers(NULL, released);
Willy Tarreau787db9a2018-06-14 18:31:46 +02004061 }
Willy Tarreauea392822017-10-31 10:02:25 +01004062
Willy Tarreau4481e262019-10-31 15:36:30 +01004063 /* in any case this connection must not be considered idle anymore */
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01004064 if (h2c->conn->flags & CO_FL_LIST_MASK) {
4065 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004066 conn_delete_from_tree(&h2c->conn->hash_node->node);
Amaury Denoyelle3d752a82021-02-19 15:37:38 +01004067 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
4068 }
Willy Tarreau4481e262019-10-31 15:36:30 +01004069
Willy Tarreau0975f112018-03-29 15:22:59 +02004070 /* either we can release everything now or it will be done later once
4071 * the last stream closes.
4072 */
4073 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02004074 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01004075
Willy Tarreau7838a792019-08-12 18:42:03 +02004076 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01004077 return NULL;
4078}
4079
4080
Willy Tarreau62f52692017-10-08 23:01:42 +02004081/*******************************************/
4082/* functions below are used by the streams */
4083/*******************************************/
4084
4085/*
4086 * Attach a new stream to a connection
4087 * (Used for outgoing connections)
4088 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01004089static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02004090{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004091 struct conn_stream *cs;
4092 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004093 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004094
Willy Tarreau7838a792019-08-12 18:42:03 +02004095 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02004096 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02004097 if (!cs) {
4098 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004099 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004100 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01004101 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004102 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004103 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004104 cs_free(cs);
4105 return NULL;
4106 }
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004107
4108 /* the connection is not idle anymore, let's mark this */
4109 HA_ATOMIC_AND(&h2c->wait_event.tasklet->state, ~TASK_F_USR1);
Willy Tarreau4f8cd432021-03-02 17:27:58 +01004110 xprt_set_used(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004111
Willy Tarreau7838a792019-08-12 18:42:03 +02004112 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004113 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02004114}
4115
Willy Tarreaufafd3982018-11-18 21:29:20 +01004116/* Retrieves the first valid conn_stream from this connection, or returns NULL.
4117 * We have to scan because we may have some orphan streams. It might be
4118 * beneficial to scan backwards from the end to reduce the likeliness to find
4119 * orphans.
4120 */
4121static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
4122{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004123 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01004124 struct h2s *h2s;
4125 struct eb32_node *node;
4126
4127 node = eb32_first(&h2c->streams_by_id);
4128 while (node) {
4129 h2s = container_of(node, struct h2s, by_id);
4130 if (h2s->cs)
4131 return h2s->cs;
4132 node = eb32_next(node);
4133 }
4134 return NULL;
4135}
4136
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004137static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
4138{
4139 int ret = 0;
4140 struct h2c *h2c = conn->ctx;
4141
4142 switch (mux_ctl) {
4143 case MUX_STATUS:
4144 /* Only consider the mux to be ready if we're done with
4145 * the preface and settings, and we had no error.
4146 */
4147 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
4148 ret |= MUX_STATUS_READY;
4149 return ret;
Christopher Faulet4c8ad842020-10-06 14:59:17 +02004150 case MUX_EXIT_STATUS:
4151 return MUX_ES_UNKNOWN;
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004152 default:
4153 return -1;
4154 }
4155}
4156
Willy Tarreau62f52692017-10-08 23:01:42 +02004157/*
Olivier Houchard060ed432018-11-06 16:32:42 +01004158 * Destroy the mux and the associated connection, if it is no longer used
4159 */
Christopher Faulet73c12072019-04-08 11:23:22 +02004160static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01004161{
Christopher Faulet73c12072019-04-08 11:23:22 +02004162 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01004163
Willy Tarreau7838a792019-08-12 18:42:03 +02004164 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02004165 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02004166 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004167 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01004168}
4169
4170/*
Willy Tarreau62f52692017-10-08 23:01:42 +02004171 * Detach the stream from the connection and possibly release the connection.
4172 */
4173static void h2_detach(struct conn_stream *cs)
4174{
Willy Tarreau60935142017-10-16 18:11:19 +02004175 struct h2s *h2s = cs->ctx;
4176 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01004177 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004178
Willy Tarreau7838a792019-08-12 18:42:03 +02004179 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
4180
Willy Tarreau60935142017-10-16 18:11:19 +02004181 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004182 if (!h2s) {
4183 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02004184 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004185 }
Willy Tarreau60935142017-10-16 18:11:19 +02004186
Willy Tarreaud9464162020-01-10 18:25:07 +01004187 /* there's no txbuf so we're certain not to be able to send anything */
4188 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02004189
Olivier Houchardf502aca2018-12-14 19:42:40 +01004190 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004191 h2c = h2s->h2c;
4192 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02004193 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01004194 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
4195 !h2_frt_has_too_many_cs(h2c)) {
4196 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02004197 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004198 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02004199 }
Willy Tarreau60935142017-10-16 18:11:19 +02004200
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004201 /* this stream may be blocked waiting for some data to leave (possibly
4202 * an ES or RST frame), so orphan it in this case.
4203 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02004204 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02004205 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01004206 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01004207 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004208 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004209 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004210 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004211
Willy Tarreau45f752e2017-10-30 15:44:59 +01004212 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
4213 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
4214 /* unblock the connection if it was blocked on this
4215 * stream.
4216 */
4217 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
4218 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004219 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01004220 }
4221
Willy Tarreau71049cc2018-03-28 13:56:39 +02004222 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02004223
Christopher Faulet9b79a102019-07-15 11:22:56 +02004224 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01004225 if (!(h2c->conn->flags &
4226 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004227 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02004228 /* Add the connection in the session server list, if not already done */
4229 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
4230 h2c->conn->owner = NULL;
4231 if (eb_is_empty(&h2c->streams_by_id)) {
4232 h2c->conn->mux->destroy(h2c);
4233 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4234 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02004235 }
4236 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02004237 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004238 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
4239 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
4240 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01004241 return;
4242 }
4243 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004244 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004245 else {
4246 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004247 /* If the connection is owned by the session, first remove it
4248 * from its list
4249 */
4250 if (h2c->conn->owner) {
4251 session_unown_conn(h2c->conn->owner, h2c->conn);
4252 h2c->conn->owner = NULL;
4253 }
4254
Willy Tarreaue388f2f2021-03-02 16:51:09 +01004255 /* mark that the tasklet may lose its context to another thread and
4256 * that the handler needs to check it under the idle conns lock.
4257 */
4258 HA_ATOMIC_OR(&h2c->wait_event.tasklet->state, TASK_F_USR1);
Willy Tarreau4f8cd432021-03-02 17:27:58 +01004259 xprt_set_idle(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
4260
Olivier Houcharddc2f2752020-02-13 19:12:07 +01004261 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01004262 /* The server doesn't want it, let's kill the connection right away */
4263 h2c->conn->mux->destroy(h2c);
4264 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4265 return;
4266 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01004267 /* At this point, the connection has been added to the
4268 * server idle list, so another thread may already have
4269 * hijacked it, so we can't do anything with it.
4270 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01004271 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
4272 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01004273
Olivier Houchard8a786902018-12-15 16:05:40 +01004274 }
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004275 else if (!h2c->conn->hash_node->node.node.leaf_p &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004276 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
Willy Tarreau2b718102021-04-21 07:32:39 +02004277 !LIST_INLIST(&h2c->conn->session_list)) {
Willy Tarreau430bf4a2021-03-04 09:45:32 +01004278 ebmb_insert(&__objt_server(h2c->conn->target)->per_thr[tid].avail_conns,
Amaury Denoyelle8990b012021-02-19 15:29:16 +01004279 &h2c->conn->hash_node->node,
4280 sizeof(h2c->conn->hash_node->hash));
Christopher Fauletc5579d12020-07-01 15:45:41 +02004281 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004282 }
4283 }
4284 }
4285
Willy Tarreaue323f342018-03-28 13:51:45 +02004286 /* We don't want to close right now unless we're removing the
4287 * last stream, and either the connection is in error, or it
4288 * reached the ID already specified in a GOAWAY frame received
4289 * or sent (as seen by last_sid >= 0).
4290 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004291 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004292 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004293 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004294 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004295 }
4296 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004297 if (h2c_may_expire(h2c))
4298 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4299 else
4300 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004301 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004302 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004303 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004304 else
4305 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004306}
4307
Willy Tarreau88bdba32019-05-13 18:17:53 +02004308/* Performs a synchronous or asynchronous shutr(). */
4309static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004310{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004311 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004312
Willy Tarreauf983d002019-05-14 10:40:21 +02004313 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004314 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004315
Willy Tarreau7838a792019-08-12 18:42:03 +02004316 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4317
Willy Tarreau18059042019-01-31 19:12:48 +01004318 /* a connstream may require us to immediately kill the whole connection
4319 * for example because of a "tcp-request content reject" rule that is
4320 * normally used to limit abuse. In this case we schedule a goaway to
4321 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004322 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004323 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004324 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004325 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004326 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4327 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4328 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004329 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4330 /* Nothing was never sent for this stream, so reset with
4331 * REFUSED_STREAM error to let the client retry the
4332 * request.
4333 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004334 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004335 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4336 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004337 else {
4338 /* a final response was already provided, we don't want this
4339 * stream anymore. This may happen when the server responds
4340 * before the end of an upload and closes quickly (redirect,
4341 * deny, ...)
4342 */
4343 h2s_error(h2s, H2_ERR_CANCEL);
4344 }
Willy Tarreau18059042019-01-31 19:12:48 +01004345
Willy Tarreau90c32322017-11-24 08:00:30 +01004346 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004347 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004348 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004349
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004350 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004351 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004352 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004353 done:
4354 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004355 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004356 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004357add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004358 /* Let the handler know we want to shutr, and add ourselves to the
4359 * most relevant list if not yet done. h2_deferred_shut() will be
4360 * automatically called via the shut_tl tasklet when there's room
4361 * again.
4362 */
4363 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreau2b718102021-04-21 07:32:39 +02004364 if (!LIST_INLIST(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004365 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02004366 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004367 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Willy Tarreau2b718102021-04-21 07:32:39 +02004368 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004369 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004370 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004371 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004372}
4373
Willy Tarreau88bdba32019-05-13 18:17:53 +02004374/* Performs a synchronous or asynchronous shutw(). */
4375static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004376{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004377 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004378
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004379 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004380 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004381
Willy Tarreau7838a792019-08-12 18:42:03 +02004382 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4383
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004384 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004385 /* we can cleanly close using an empty data frame only after headers */
4386
4387 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4388 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004389 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004390
4391 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004392 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004393 else
4394 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004395 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004396 /* a connstream may require us to immediately kill the whole connection
4397 * for example because of a "tcp-request content reject" rule that is
4398 * normally used to limit abuse. In this case we schedule a goaway to
4399 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004400 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004401 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004402 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004403 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004404 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4405 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4406 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004407 else {
4408 /* Nothing was never sent for this stream, so reset with
4409 * REFUSED_STREAM error to let the client retry the
4410 * request.
4411 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004412 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004413 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4414 }
Willy Tarreau18059042019-01-31 19:12:48 +01004415
Willy Tarreau90c32322017-11-24 08:00:30 +01004416 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004417 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004418 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004419
Willy Tarreau00dd0782018-03-01 16:31:34 +01004420 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004421 }
4422
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004423 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004424 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004425
4426 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4427
Willy Tarreau88bdba32019-05-13 18:17:53 +02004428 done:
4429 h2s->flags &= ~H2_SF_WANT_SHUTW;
4430 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004431
4432 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004433 /* Let the handler know we want to shutw, and add ourselves to the
4434 * most relevant list if not yet done. h2_deferred_shut() will be
4435 * automatically called via the shut_tl tasklet when there's room
4436 * again.
4437 */
4438 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreau2b718102021-04-21 07:32:39 +02004439 if (!LIST_INLIST(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004440 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02004441 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004442 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Willy Tarreau2b718102021-04-21 07:32:39 +02004443 LIST_APPEND(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004444 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004445 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004446 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004447}
4448
Willy Tarreau5723f292020-01-10 15:16:57 +01004449/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004450 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4451 * and prevented the last frame from being emitted.
4452 */
Willy Tarreau144f84a2021-03-02 16:09:26 +01004453struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned int state)
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004454{
4455 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004456 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004457
Willy Tarreau7838a792019-08-12 18:42:03 +02004458 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4459
Willy Tarreau5723f292020-01-10 15:16:57 +01004460 if (h2s->flags & H2_SF_NOTIFIED) {
4461 /* some data processing remains to be done first */
4462 goto end;
4463 }
4464
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004465 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004466 h2_do_shutw(h2s);
4467
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004468 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004469 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004470
Willy Tarreau88bdba32019-05-13 18:17:53 +02004471 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004472 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004473 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004474
Willy Tarreau88bdba32019-05-13 18:17:53 +02004475 if (!h2s->cs) {
4476 h2s_destroy(h2s);
Willy Tarreau74163142021-03-13 11:30:19 +01004477 if (h2c_is_dead(h2c)) {
Willy Tarreau88bdba32019-05-13 18:17:53 +02004478 h2_release(h2c);
Willy Tarreau74163142021-03-13 11:30:19 +01004479 t = NULL;
4480 }
Willy Tarreau88bdba32019-05-13 18:17:53 +02004481 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004482 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004483 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004484 TRACE_LEAVE(H2_EV_STRM_SHUT);
Willy Tarreau74163142021-03-13 11:30:19 +01004485 return t;
Willy Tarreau62f52692017-10-08 23:01:42 +02004486}
4487
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004488/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004489static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4490{
4491 struct h2s *h2s = cs->ctx;
4492
Willy Tarreau7838a792019-08-12 18:42:03 +02004493 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004494 if (cs->flags & CS_FL_KILL_CONN)
4495 h2s->flags |= H2_SF_KILL_CONN;
4496
Willy Tarreau7838a792019-08-12 18:42:03 +02004497 if (mode)
4498 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004499
Willy Tarreau7838a792019-08-12 18:42:03 +02004500 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004501}
4502
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004503/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004504static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4505{
4506 struct h2s *h2s = cs->ctx;
4507
Willy Tarreau7838a792019-08-12 18:42:03 +02004508 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004509 if (cs->flags & CS_FL_KILL_CONN)
4510 h2s->flags |= H2_SF_KILL_CONN;
4511
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004512 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004513 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004514}
4515
Christopher Faulet9b79a102019-07-15 11:22:56 +02004516/* Decode the payload of a HEADERS frame and produce the HTX request or response
4517 * depending on the connection's side. Returns a positive value on success, a
4518 * negative value on failure, or 0 if it couldn't proceed. May report connection
4519 * errors in h2c->errcode if the frame is non-decodable and the connection
4520 * unrecoverable. In absence of connection error when a failure is reported, the
4521 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004522 *
4523 * The function may fold CONTINUATION frames into the initial HEADERS frame
4524 * by removing padding and next frame header, then moving the CONTINUATION
4525 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4526 * leaving a hole between the main frame and the beginning of the next one.
4527 * The possibly remaining incomplete or next frame at the end may be moved
4528 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4529 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4530 *
4531 * A buffer at the beginning of processing may look like this :
4532 *
4533 * ,---.---------.-----.--------------.--------------.------.---.
4534 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4535 * `---^---------^-----^--------------^--------------^------^---'
4536 * | | <-----> | |
4537 * area | dpl | wrap
4538 * |<--------------> |
4539 * | dfl |
4540 * |<-------------------------------------------------->|
4541 * head data
4542 *
4543 * Padding is automatically overwritten when folding, participating to the
4544 * hole size after dfl :
4545 *
4546 * ,---.------------------------.-----.--------------.------.---.
4547 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4548 * `---^------------------------^-----^--------------^------^---'
4549 * | | <-----> | |
4550 * area | hole | wrap
4551 * |<-----------------------> |
4552 * | dfl |
4553 * |<-------------------------------------------------->|
4554 * head data
4555 *
4556 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4557 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4558 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004559 *
4560 * The <flags> field must point to either the stream's flags or to a copy of it
4561 * so that the function can update the following flags :
4562 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004563 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004564 *
4565 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4566 * decoding, in order to detect if we're dealing with a headers or a trailers
4567 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004568 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01004569static 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 +02004570{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004571 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004572 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004573 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004574 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004575 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004576 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004577 int flen; // header frame len
4578 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004579 int ret = 0;
4580 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004581 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004582
Willy Tarreau7838a792019-08-12 18:42:03 +02004583 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4584
Willy Tarreauea18f862018-12-22 20:19:26 +01004585next_frame:
4586 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4587 goto leave; // incomplete input frame
4588
4589 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4590 * this case, we'll try to paste it immediately after the initial
4591 * HEADERS frame payload and kill any possible padding. The initial
4592 * frame's length will be increased to represent the concatenation
4593 * of the two frames. The next frame is read from position <tlen>
4594 * and written at position <flen> (minus padding if some is present).
4595 */
4596 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4597 struct h2_fh hdr;
4598 int clen; // CONTINUATION frame's payload length
4599
Willy Tarreau7838a792019-08-12 18:42:03 +02004600 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 +01004601 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4602 /* no more data, the buffer may be full, either due to
4603 * too large a frame or because of too large a hole that
4604 * we're going to compact at the end.
4605 */
4606 goto leave;
4607 }
4608
4609 if (hdr.ft != H2_FT_CONTINUATION) {
4610 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004611 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 +01004612 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004613 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreauea18f862018-12-22 20:19:26 +01004614 goto fail;
4615 }
4616
4617 if (hdr.sid != h2c->dsi) {
4618 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004619 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 +01004620 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004621 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreauea18f862018-12-22 20:19:26 +01004622 goto fail;
4623 }
4624
4625 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4626 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004627 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 +01004628 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4629 goto fail;
4630 }
4631
4632 /* detect when we must stop aggragating frames */
4633 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4634
4635 /* Take as much as we can of the CONTINUATION frame's payload */
4636 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4637 if (clen > hdr.len)
4638 clen = hdr.len;
4639
4640 /* Move the frame's payload over the padding, hole and frame
4641 * header. At least one of hole or dpl is null (see diagrams
4642 * above). The hole moves after the new aggragated frame.
4643 */
4644 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 +02004645 h2c->dfl += hdr.len - h2c->dpl;
Willy Tarreauea18f862018-12-22 20:19:26 +01004646 hole += h2c->dpl + 9;
4647 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004648 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 +01004649 goto next_frame;
4650 }
4651
4652 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004653
Willy Tarreau13278b42017-10-13 19:23:14 +02004654 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004655 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004656 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004657 copy = alloc_trash_chunk();
4658 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004659 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 +02004660 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4661 goto fail;
4662 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004663 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4664 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4665 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004666 }
4667
Willy Tarreau13278b42017-10-13 19:23:14 +02004668 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4669 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004670 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004671 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004672 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 +01004673 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004674 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004675 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004676 }
4677
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004678 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004679 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 +01004680 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4681 goto fail;
4682 }
4683
Willy Tarreau13278b42017-10-13 19:23:14 +02004684 hdrs += 5; // stream dep = 4, weight = 1
4685 flen -= 5;
4686 }
4687
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004688 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004689 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 +01004690 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004691 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004692 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004693
Willy Tarreau937f7602018-02-26 15:22:17 +01004694 /* we can't retry a failed decompression operation so we must be very
4695 * careful not to take any risks. In practice the output buffer is
4696 * always empty except maybe for trailers, in which case we simply have
4697 * to wait for the upper layer to finish consuming what is available.
4698 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004699 htx = htx_from_buf(rxbuf);
4700 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004701 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 +02004702 h2c->flags |= H2_CF_DEM_SFULL;
4703 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004704 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004705
Willy Tarreau25919232019-01-03 14:48:18 +01004706 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004707 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4708 sizeof(list)/sizeof(list[0]), tmp);
4709 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004710 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 +01004711 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4712 goto fail;
4713 }
4714
Willy Tarreau25919232019-01-03 14:48:18 +01004715 /* The PACK decompressor was updated, let's update the input buffer and
4716 * the parser's state to commit these changes and allow us to later
4717 * fail solely on the stream if needed.
4718 */
4719 b_del(&h2c->dbuf, h2c->dfl + hole);
4720 h2c->dfl = hole = 0;
4721 h2c->st0 = H2_CS_FRAME_H;
4722
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004723 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004724 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Christopher Fauletd0db4232021-01-22 11:46:30 +01004725 msgf |= (*flags & H2_SF_BODY_TUNNEL) ? H2_MSGF_BODY_TUNNEL: 0;
Amaury Denoyelle74162742020-12-11 17:53:05 +01004726 /* If an Extended CONNECT has been sent on this stream, set message flag
Ilya Shipitsinacf84592021-02-06 22:29:08 +05004727 * to convert 200 response to 101 htx response */
Amaury Denoyelle74162742020-12-11 17:53:05 +01004728 msgf |= (*flags & H2_SF_EXT_CONNECT_SENT) ? H2_MSGF_EXT_CONNECT: 0;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004729
Willy Tarreau88d138e2019-01-02 19:38:14 +01004730 if (*flags & H2_SF_HEADERS_RCVD)
4731 goto trailers;
4732
4733 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004734 if (h2c->flags & H2_CF_IS_BACK)
Amaury Denoyelle74162742020-12-11 17:53:05 +01004735 outlen = h2_make_htx_response(list, htx, &msgf, body_len, upgrade_protocol);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004736 else
4737 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004738
4739 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004740 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004741 TRACE_STATE("request headers too large", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004742 goto fail;
4743 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004744
Willy Tarreau174b06a2018-04-25 18:13:58 +02004745 if (msgf & H2_MSGF_BODY) {
4746 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004747 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004748 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004749 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004750 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004751 }
Christopher Faulet7d247f02020-12-02 14:26:36 +01004752 if (msgf & H2_MSGF_BODYLESS_RSP)
4753 *flags |= H2_SF_BODYLESS_RESP;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004754
Christopher Fauletd0db4232021-01-22 11:46:30 +01004755 if (msgf & H2_MSGF_BODY_TUNNEL)
4756 *flags |= H2_SF_BODY_TUNNEL;
4757 else {
4758 /* Abort the tunnel attempt, if any */
4759 if (*flags & H2_SF_BODY_TUNNEL)
4760 *flags |= H2_SF_TUNNEL_ABRT;
4761 *flags &= ~H2_SF_BODY_TUNNEL;
4762 }
4763
Willy Tarreau88d138e2019-01-02 19:38:14 +01004764 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004765 /* indicate that a HEADERS frame was received for this stream, except
4766 * for 1xx responses. For 1xx responses, another HEADERS frame is
4767 * expected.
4768 */
4769 if (!(msgf & H2_MSGF_RSP_1XX))
4770 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004771
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004772 if (h2c->dff & H2_F_HEADERS_END_STREAM) {
4773 /* no more data are expected for this message */
4774 htx->flags |= HTX_FL_EOM;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004775 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004776
Amaury Denoyelleefe22762020-12-11 17:53:08 +01004777 if (msgf & H2_MSGF_EXT_CONNECT)
4778 *flags |= H2_SF_EXT_CONNECT_RCVD;
4779
Willy Tarreau86277d42019-01-02 15:36:11 +01004780 /* success */
4781 ret = 1;
4782
Willy Tarreau68dd9852017-07-03 14:44:26 +02004783 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004784 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004785 * move the remaining data over it.
4786 */
4787 if (hole) {
4788 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4789 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4790 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4791 b_sub(&h2c->dbuf, hole);
4792 }
4793
Christopher Faulet07f88d72021-04-21 10:39:53 +02004794 if (b_full(&h2c->dbuf) && h2c->dfl) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004795 /* too large frames */
4796 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004797 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004798 }
4799
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004800 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004801 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004802 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004803 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004804 return ret;
4805
Willy Tarreau68dd9852017-07-03 14:44:26 +02004806 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004807 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004808 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004809
4810 trailers:
4811 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004812 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4813 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004814 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 +01004815 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau4781b152021-04-06 13:53:36 +02004816 HA_ATOMIC_INC(&h2c->px_counters->conn_proto_err);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004817 goto fail;
4818 }
4819
Christopher Faulet9b79a102019-07-15 11:22:56 +02004820 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004821 if (h2_make_htx_trailers(list, htx) <= 0) {
4822 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 +02004823 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004824 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004825 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004826}
4827
Christopher Faulet9b79a102019-07-15 11:22:56 +02004828/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004829 * parser state is automatically updated. Returns > 0 if it could completely
4830 * send the current frame, 0 if it couldn't complete, in which case
4831 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4832 * DATA frame can return 0 as a valid result). Stream errors are reported in
4833 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4834 * have checked the frame header and ensured that the frame was complete or the
4835 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004836 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004837static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004838{
4839 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004840 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004841 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004842 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004843 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004844 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004845
Willy Tarreau7838a792019-08-12 18:42:03 +02004846 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4847
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004848 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004849
Olivier Houchard638b7992018-08-16 15:41:52 +02004850 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004851 if (!csbuf) {
4852 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004853 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 +01004854 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004855 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004856 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004857
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004858try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004859 flen = h2c->dfl - h2c->dpl;
4860 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004861 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004862
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004863 if (flen > b_data(&h2c->dbuf)) {
4864 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004865 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004866 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004867 }
4868
Christopher Faulet9b79a102019-07-15 11:22:56 +02004869 block = htx_free_data_space(htx);
4870 if (!block) {
4871 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004872 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 +02004873 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004874 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004875 if (flen > block)
4876 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004877
Christopher Faulet9b79a102019-07-15 11:22:56 +02004878 /* here, flen is the max we can copy into the output buffer */
4879 block = b_contig_data(&h2c->dbuf, 0);
4880 if (flen > block)
4881 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004882
Christopher Faulet9b79a102019-07-15 11:22:56 +02004883 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004884 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 +02004885
Christopher Faulet9b79a102019-07-15 11:22:56 +02004886 b_del(&h2c->dbuf, sent);
4887 h2c->dfl -= sent;
4888 h2c->rcvd_c += sent;
4889 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004890
Christopher Faulet9b79a102019-07-15 11:22:56 +02004891 if (h2s->flags & H2_SF_DATA_CLEN) {
4892 h2s->body_len -= sent;
4893 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004894 }
4895
Christopher Faulet9b79a102019-07-15 11:22:56 +02004896 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004897 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004898 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 +01004899 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004900 }
4901
Christopher Faulet9b79a102019-07-15 11:22:56 +02004902 goto try_again;
4903
Willy Tarreau4a28da12018-01-04 14:41:00 +01004904 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004905 /* here we're done with the frame, all the payload (except padding) was
4906 * transferred.
4907 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004908
Christopher Faulet5be651d2021-01-22 15:28:03 +01004909 if (!(h2s->flags & H2_SF_BODY_TUNNEL) && (h2c->dff & H2_F_DATA_END_STREAM)) {
4910 /* no more data are expected for this message. This add the EOM
4911 * flag but only on the response path or if no tunnel attempt
4912 * was aborted. Otherwise (request path + tunnel abrted), the
4913 * EOM was already reported.
4914 */
Christopher Faulet33724322021-02-10 09:04:59 +01004915 if ((h2c->flags & H2_CF_IS_BACK) || !(h2s->flags & H2_SF_TUNNEL_ABRT)) {
4916 /* If we receive an empty DATA frame with ES flag while the HTX
4917 * message is empty, we must be sure to push a block to be sure
4918 * the HTX EOM flag will be handled on the other side. It is a
4919 * workaround because for now it is not possible to push empty
4920 * HTX DATA block. And without this block, there is no way to
4921 * "commit" the end of the message.
4922 */
4923 if (htx_is_empty(htx)) {
4924 if (!htx_add_endof(htx, HTX_BLK_EOT))
4925 goto fail;
4926 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004927 htx->flags |= HTX_FL_EOM;
Christopher Faulet33724322021-02-10 09:04:59 +01004928 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004929 }
4930
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004931 h2c->rcvd_c += h2c->dpl;
4932 h2c->rcvd_s += h2c->dpl;
4933 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004934 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004935 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004936 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004937 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004938 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004939 if (htx)
4940 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004941 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004942 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004943}
4944
Willy Tarreau115e83b2018-12-01 19:17:53 +01004945/* Try to send a HEADERS frame matching HTX response present in HTX message
4946 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4947 * must check the stream's status to detect any error which might have happened
4948 * subsequently to a successful send. The htx blocks are automatically removed
4949 * from the message. The htx message is assumed to be valid since produced from
4950 * the internal code, hence it contains a start line, an optional series of
4951 * header blocks and an end of header, otherwise an invalid frame could be
4952 * emitted and the resulting htx message could be left in an inconsistent state.
4953 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004954static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004955{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004956 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004957 struct h2c *h2c = h2s->h2c;
4958 struct htx_blk *blk;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004959 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004960 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004961 struct htx_sl *sl;
4962 enum htx_blk_type type;
4963 int es_now = 0;
4964 int ret = 0;
4965 int hdr;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004966
Willy Tarreau7838a792019-08-12 18:42:03 +02004967 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4968
Willy Tarreau115e83b2018-12-01 19:17:53 +01004969 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004970 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004971 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004972 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004973 return 0;
4974 }
4975
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004976 /* get the start line (we do have one) and the rest of the headers,
4977 * that we dump starting at header 0 */
4978 sl = NULL;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004979 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004980 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau115e83b2018-12-01 19:17:53 +01004981 type = htx_get_blk_type(blk);
4982
4983 if (type == HTX_BLK_UNUSED)
4984 continue;
4985
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004986 if (type == HTX_BLK_EOH)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004987 break;
4988
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004989 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01004990 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004991 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4992 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4993 goto fail;
4994 }
4995
4996 list[hdr].n = htx_get_blk_name(htx, blk);
4997 list[hdr].v = htx_get_blk_value(htx, blk);
4998 hdr++;
4999 }
5000 else if (type == HTX_BLK_RES_SL) {
Christopher Faulet56498132021-01-29 11:39:43 +01005001 BUG_ON(sl); /* Only one start-line expected */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005002 sl = htx_get_blk_ptr(htx, blk);
5003 h2s->status = sl->info.res.status;
Christopher Faulet7d247f02020-12-02 14:26:36 +01005004 if (h2s->status == 204 || h2s->status == 304)
5005 h2s->flags |= H2_SF_BODYLESS_RESP;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005006 if (h2s->status < 100 || h2s->status > 999) {
5007 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5008 goto fail;
5009 }
5010 else if (h2s->status == 101) {
Amaury Denoyelleefe22762020-12-11 17:53:08 +01005011 if (unlikely(h2s->flags & H2_SF_EXT_CONNECT_RCVD)) {
5012 /* If an Extended CONNECT has been received, we need to convert 101 to 200 */
5013 h2s->status = 200;
5014 h2s->flags &= ~H2_SF_EXT_CONNECT_RCVD;
5015 }
5016 else {
5017 /* Otherwise, 101 responses are not supported in H2, so return a error (RFC7540#8.1.1) */
5018 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5019 goto fail;
5020 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005021 }
5022 else if ((h2s->flags & H2_SF_BODY_TUNNEL) && h2s->status >= 300) {
5023 /* Abort the tunnel attempt */
5024 h2s->flags &= ~H2_SF_BODY_TUNNEL;
5025 h2s->flags |= H2_SF_TUNNEL_ABRT;
5026 }
5027 }
5028 else {
5029 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 +01005030 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005031 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005032 }
5033
Christopher Faulet56498132021-01-29 11:39:43 +01005034 /* The start-line me be defined */
5035 BUG_ON(!sl);
5036
Willy Tarreau115e83b2018-12-01 19:17:53 +01005037 /* marker for end of headers */
5038 list[hdr].n = ist("");
5039
Willy Tarreau9c218e72019-05-26 10:08:28 +02005040 mbuf = br_tail(h2c->mbuf);
5041 retry:
5042 if (!h2_get_buf(h2c, mbuf)) {
5043 h2c->flags |= H2_CF_MUX_MALLOC;
5044 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005045 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 +02005046 return 0;
5047 }
5048
Willy Tarreau115e83b2018-12-01 19:17:53 +01005049 chunk_reset(&outbuf);
5050
5051 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005052 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5053 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005054 break;
5055 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005056 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01005057 }
5058
5059 if (outbuf.size < 9)
5060 goto full;
5061
5062 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5063 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5064 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5065 outbuf.data = 9;
5066
5067 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01005068 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005069 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005070 goto realign_again;
5071 goto full;
5072 }
5073
5074 /* encode all headers, stop at empty name */
5075 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
5076 /* these ones do not exist in H2 and must be dropped. */
5077 if (isteq(list[hdr].n, ist("connection")) ||
5078 isteq(list[hdr].n, ist("proxy-connection")) ||
5079 isteq(list[hdr].n, ist("keep-alive")) ||
5080 isteq(list[hdr].n, ist("upgrade")) ||
5081 isteq(list[hdr].n, ist("transfer-encoding")))
5082 continue;
5083
Christopher Faulet86d144c2019-08-14 16:32:25 +02005084 /* Skip all pseudo-headers */
5085 if (*(list[hdr].n.ptr) == ':')
5086 continue;
5087
Willy Tarreau115e83b2018-12-01 19:17:53 +01005088 if (isteq(list[hdr].n, ist("")))
5089 break; // end
5090
5091 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
5092 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005093 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005094 goto realign_again;
5095 goto full;
5096 }
5097 }
5098
Willy Tarreaucb985a42019-10-07 16:56:34 +02005099 /* update the frame's size */
5100 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5101
5102 if (outbuf.data > h2c->mfs + 9) {
5103 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5104 /* output full */
5105 if (b_space_wraps(mbuf))
5106 goto realign_again;
5107 goto full;
5108 }
5109 }
5110
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005111 /* remove all header blocks including the EOH and compute the
5112 * corresponding size.
Willy Tarreau115e83b2018-12-01 19:17:53 +01005113 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005114 ret = 0;
5115 blk = htx_get_head_blk(htx);
5116 while (blk) {
5117 type = htx_get_blk_type(blk);
5118 ret += htx_get_blksz(blk);
5119 blk = htx_remove_blk(htx, blk);
5120 /* The removed block is the EOH */
5121 if (type == HTX_BLK_EOH)
5122 break;
Christopher Faulet5be651d2021-01-22 15:28:03 +01005123 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005124
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005125 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5126 /* Response already closed: add END_STREAM */
5127 es_now = 1;
5128 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005129 else if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx) && h2s->status >= 200) {
5130 /* EOM+empty: we may need to add END_STREAM except for 1xx
Christopher Faulet991febd2020-12-02 15:17:31 +01005131 * responses and tunneled response.
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005132 */
Christopher Faulet991febd2020-12-02 15:17:31 +01005133 if (!(h2s->flags & H2_SF_BODY_TUNNEL) || h2s->status >= 300)
5134 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005135 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005136
Willy Tarreau115e83b2018-12-01 19:17:53 +01005137 if (es_now)
5138 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5139
5140 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005141 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005142 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01005143
5144 /* indicates the HEADERS frame was sent, except for 1xx responses. For
5145 * 1xx responses, another HEADERS frame is expected.
5146 */
Christopher Faulet89899422020-12-07 18:24:43 +01005147 if (h2s->status >= 200)
Christopher Faulet0b465482019-02-19 15:14:23 +01005148 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005149
Willy Tarreau115e83b2018-12-01 19:17:53 +01005150 if (es_now) {
5151 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005152 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 +01005153 if (h2s->st == H2_SS_OPEN)
5154 h2s->st = H2_SS_HLOC;
5155 else
5156 h2s_close(h2s);
5157 }
5158
5159 /* OK we could properly deliver the response */
Willy Tarreau115e83b2018-12-01 19:17:53 +01005160 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005161 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005162 return ret;
5163 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005164 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5165 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005166 h2c->flags |= H2_CF_MUX_MFULL;
5167 h2s->flags |= H2_SF_BLK_MROOM;
5168 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005169 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 +01005170 goto end;
5171 fail:
5172 /* unparsable HTX messages, too large ones to be produced in the local
5173 * list etc go here (unrecoverable errors).
5174 */
5175 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5176 ret = 0;
5177 goto end;
5178}
5179
Willy Tarreau80739692018-10-05 11:35:57 +02005180/* Try to send a HEADERS frame matching HTX request present in HTX message
5181 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5182 * must check the stream's status to detect any error which might have happened
5183 * subsequently to a successful send. The htx blocks are automatically removed
5184 * from the message. The htx message is assumed to be valid since produced from
5185 * the internal code, hence it contains a start line, an optional series of
5186 * header blocks and an end of header, otherwise an invalid frame could be
5187 * emitted and the resulting htx message could be left in an inconsistent state.
5188 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005189static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02005190{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005191 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02005192 struct h2c *h2c = h2s->h2c;
5193 struct htx_blk *blk;
Willy Tarreau80739692018-10-05 11:35:57 +02005194 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005195 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02005196 struct htx_sl *sl;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005197 struct ist meth, uri, auth, host = IST_NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005198 enum htx_blk_type type;
5199 int es_now = 0;
5200 int ret = 0;
5201 int hdr;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005202 int extended_connect = 0;
Willy Tarreau80739692018-10-05 11:35:57 +02005203
Willy Tarreau7838a792019-08-12 18:42:03 +02005204 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5205
Willy Tarreau80739692018-10-05 11:35:57 +02005206 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005207 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005208 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005209 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005210 return 0;
5211 }
5212
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005213 /* get the start line (we do have one) and the rest of the headers,
5214 * that we dump starting at header 0 */
5215 sl = NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005216 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005217 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005218 type = htx_get_blk_type(blk);
5219
5220 if (type == HTX_BLK_UNUSED)
5221 continue;
5222
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005223 if (type == HTX_BLK_EOH)
Willy Tarreau80739692018-10-05 11:35:57 +02005224 break;
5225
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005226 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01005227 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005228 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5229 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5230 goto fail;
5231 }
Willy Tarreau80739692018-10-05 11:35:57 +02005232
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005233 list[hdr].n = htx_get_blk_name(htx, blk);
5234 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02005235
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005236 /* Skip header if same name is used to add the server name */
5237 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
5238 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
5239 continue;
Christopher Faulet67d58092019-10-02 10:51:38 +02005240
Ilya Shipitsinacf84592021-02-06 22:29:08 +05005241 /* Convert connection: upgrade to Extended connect from rfc 8441 */
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005242 if (isteqi(list[hdr].n, ist("connection"))) {
5243 /* rfc 7230 #6.1 Connection = list of tokens */
5244 struct ist connection_ist = list[hdr].v;
5245 do {
5246 if (isteqi(iststop(connection_ist, ','),
5247 ist("upgrade"))) {
5248 h2s->flags |= (H2_SF_BODY_TUNNEL|H2_SF_EXT_CONNECT_SENT);
5249 sl->info.req.meth = HTTP_METH_CONNECT;
5250 meth = ist("CONNECT");
5251
5252 extended_connect = 1;
5253 break;
5254 }
5255
5256 connection_ist = istadv(istfind(connection_ist, ','), 1);
5257 } while (istlen(connection_ist));
5258 }
5259
5260 if (isteq(list[hdr].n, ist("upgrade"))) {
5261 /* rfc 7230 #6.7 Upgrade = list of protocols
5262 * rfc 8441 #4 Extended connect = :protocol is single-valued
5263 *
5264 * only first HTTP/1 protocol is preserved
5265 */
5266 const struct ist protocol = iststop(list[hdr].v, ',');
5267 /* upgrade_protocol field is 16 bytes long in h2s */
5268 istpad(h2s->upgrade_protocol, isttrim(protocol, 15));
5269 }
5270
5271 if (isteq(list[hdr].n, ist("host")))
5272 host = list[hdr].v;
5273
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005274 hdr++;
5275 }
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005276 else if (type == HTX_BLK_REQ_SL) {
5277 BUG_ON(sl); /* Only one start-line expected */
5278 sl = htx_get_blk_ptr(htx, blk);
5279 meth = htx_sl_req_meth(sl);
5280 uri = htx_sl_req_uri(sl);
5281 if (sl->info.req.meth == HTTP_METH_HEAD)
5282 h2s->flags |= H2_SF_BODYLESS_RESP;
5283 if (unlikely(uri.len == 0)) {
5284 TRACE_ERROR("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5285 goto fail;
5286 }
5287 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005288 else {
5289 TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5290 goto fail;
5291 }
Willy Tarreau80739692018-10-05 11:35:57 +02005292 }
5293
Christopher Faulet56498132021-01-29 11:39:43 +01005294 /* The start-line me be defined */
5295 BUG_ON(!sl);
5296
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02005297 /* Now add the server name to a header (if requested) */
5298 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
5299 struct server *srv = objt_server(h2c->conn->target);
5300
5301 if (srv) {
5302 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
5303 list[hdr].v = ist(srv->id);
5304 hdr++;
5305 }
5306 }
5307
Willy Tarreau80739692018-10-05 11:35:57 +02005308 /* marker for end of headers */
5309 list[hdr].n = ist("");
5310
Willy Tarreau9c218e72019-05-26 10:08:28 +02005311 mbuf = br_tail(h2c->mbuf);
5312 retry:
5313 if (!h2_get_buf(h2c, mbuf)) {
5314 h2c->flags |= H2_CF_MUX_MALLOC;
5315 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005316 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 +02005317 return 0;
5318 }
5319
Willy Tarreau80739692018-10-05 11:35:57 +02005320 chunk_reset(&outbuf);
5321
5322 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005323 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5324 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005325 break;
5326 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005327 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02005328 }
5329
5330 if (outbuf.size < 9)
5331 goto full;
5332
5333 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5334 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5335 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5336 outbuf.data = 9;
5337
5338 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005339 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005340 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005341 goto realign_again;
5342 goto full;
5343 }
5344
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005345 auth = ist(NULL);
5346
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005347 /* RFC7540 #8.3: the CONNECT method must have :
5348 * - :authority set to the URI part (host:port)
5349 * - :method set to CONNECT
5350 * - :scheme and :path omitted
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005351 *
5352 * Note that this is not applicable in case of the Extended CONNECT
5353 * protocol from rfc 8441.
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005354 */
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005355 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT) && !extended_connect) {
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005356 auth = uri;
5357
5358 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5359 /* output full */
5360 if (b_space_wraps(mbuf))
5361 goto realign_again;
5362 goto full;
5363 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005364 h2s->flags |= H2_SF_BODY_TUNNEL;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005365 } else {
5366 /* other methods need a :scheme. If an authority is known from
5367 * the request line, it must be sent, otherwise only host is
5368 * sent. Host is never sent as the authority.
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005369 *
5370 * This code is also applicable for Extended CONNECT protocol
5371 * from rfc 8441.
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005372 */
5373 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005374
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005375 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5376 /* the URI seems to start with a scheme */
5377 int len = 1;
5378
5379 while (len < uri.len && uri.ptr[len] != ':')
5380 len++;
5381
5382 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5383 /* make the uri start at the authority now */
Tim Duesterhus9f75ed12021-03-02 18:57:26 +01005384 scheme = ist2(uri.ptr, len);
Tim Duesterhus154374c2021-03-02 18:57:27 +01005385 uri = istadv(uri, len + 3);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005386
5387 /* find the auth part of the URI */
Tim Duesterhus92c696e2021-02-28 16:11:36 +01005388 auth = ist2(uri.ptr, 0);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005389 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5390 auth.len++;
5391
Tim Duesterhus154374c2021-03-02 18:57:27 +01005392 uri = istadv(uri, auth.len);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005393 }
5394 }
5395
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005396 /* For Extended CONNECT, the :authority must be present.
5397 * Use host value for it.
5398 */
5399 if (unlikely(extended_connect) && isttest(host))
5400 auth = host;
5401
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005402 if (!scheme.len) {
5403 /* no explicit scheme, we're using an origin-form URI,
5404 * probably from an H1 request transcoded to H2 via an
5405 * external layer, then received as H2 without authority.
5406 * So we have to look up the scheme from the HTX flags.
5407 * In such a case only http and https are possible, and
5408 * https is the default (sent by browsers).
5409 */
5410 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5411 scheme = ist("http");
5412 else
5413 scheme = ist("https");
5414 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005415
5416 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005417 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005418 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005419 goto realign_again;
5420 goto full;
5421 }
Willy Tarreau80739692018-10-05 11:35:57 +02005422
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005423 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005424 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005425 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005426 goto realign_again;
5427 goto full;
5428 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005429
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005430 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5431 * be sent as '/' or '*'.
5432 */
5433 if (unlikely(!uri.len)) {
5434 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5435 uri = ist("*");
5436 else
5437 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005438 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005439
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005440 if (!hpack_encode_path(&outbuf, uri)) {
5441 /* output full */
5442 if (b_space_wraps(mbuf))
5443 goto realign_again;
5444 goto full;
5445 }
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005446
5447 /* encode the pseudo-header protocol from rfc8441 if using
5448 * Extended CONNECT method.
5449 */
5450 if (unlikely(extended_connect)) {
5451 const struct ist protocol = ist(h2s->upgrade_protocol);
5452 if (isttest(protocol)) {
5453 if (!hpack_encode_header(&outbuf,
5454 ist(":protocol"),
5455 protocol)) {
5456 /* output full */
5457 if (b_space_wraps(mbuf))
5458 goto realign_again;
5459 goto full;
5460 }
5461 }
5462 }
Willy Tarreau80739692018-10-05 11:35:57 +02005463 }
5464
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005465 /* encode all headers, stop at empty name. Host is only sent if we
5466 * do not provide an authority.
5467 */
Willy Tarreau80739692018-10-05 11:35:57 +02005468 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005469 struct ist n = list[hdr].n;
5470 struct ist v = list[hdr].v;
5471
Willy Tarreau80739692018-10-05 11:35:57 +02005472 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005473 if (isteq(n, ist("connection")) ||
5474 (auth.len && isteq(n, ist("host"))) ||
5475 isteq(n, ist("proxy-connection")) ||
5476 isteq(n, ist("keep-alive")) ||
5477 isteq(n, ist("upgrade")) ||
5478 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005479 continue;
5480
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005481 if (isteq(n, ist("te"))) {
5482 /* "te" may only be sent with "trailers" if this value
5483 * is present, otherwise it must be deleted.
5484 */
5485 v = istist(v, ist("trailers"));
Tim Duesterhus7b5777d2021-03-02 18:57:28 +01005486 if (!isttest(v) || (v.len > 8 && v.ptr[8] != ','))
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005487 continue;
5488 v = ist("trailers");
5489 }
5490
Christopher Faulet86d144c2019-08-14 16:32:25 +02005491 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005492 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005493 continue;
5494
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005495 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005496 break; // end
5497
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005498 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005499 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005500 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005501 goto realign_again;
5502 goto full;
5503 }
5504 }
5505
Willy Tarreaucb985a42019-10-07 16:56:34 +02005506 /* update the frame's size */
5507 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5508
5509 if (outbuf.data > h2c->mfs + 9) {
5510 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5511 /* output full */
5512 if (b_space_wraps(mbuf))
5513 goto realign_again;
5514 goto full;
5515 }
5516 }
5517
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005518 /* remove all header blocks including the EOH and compute the
5519 * corresponding size.
Willy Tarreau80739692018-10-05 11:35:57 +02005520 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005521 ret = 0;
5522 blk = htx_get_head_blk(htx);
5523 while (blk) {
5524 type = htx_get_blk_type(blk);
5525 ret += htx_get_blksz(blk);
5526 blk = htx_remove_blk(htx, blk);
5527 /* The removed block is the EOH */
5528 if (type == HTX_BLK_EOH)
5529 break;
Christopher Fauletd0db4232021-01-22 11:46:30 +01005530 }
Willy Tarreau80739692018-10-05 11:35:57 +02005531
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005532 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5533 /* Request already closed: add END_STREAM */
Willy Tarreau80739692018-10-05 11:35:57 +02005534 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005535 }
5536 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5537 /* EOM+empty: we may need to add END_STREAM (except for CONNECT
5538 * request)
5539 */
5540 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5541 es_now = 1;
5542 }
Willy Tarreau80739692018-10-05 11:35:57 +02005543
Willy Tarreau80739692018-10-05 11:35:57 +02005544 if (es_now)
5545 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5546
5547 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005548 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005549 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005550 h2s->flags |= H2_SF_HEADERS_SENT;
5551 h2s->st = H2_SS_OPEN;
5552
Willy Tarreau80739692018-10-05 11:35:57 +02005553 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005554 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 +02005555 // trim any possibly pending data (eg: inconsistent content-length)
5556 h2s->flags |= H2_SF_ES_SENT;
5557 h2s->st = H2_SS_HLOC;
5558 }
5559
Willy Tarreau80739692018-10-05 11:35:57 +02005560 end:
5561 return ret;
5562 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005563 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5564 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005565 h2c->flags |= H2_CF_MUX_MFULL;
5566 h2s->flags |= H2_SF_BLK_MROOM;
5567 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005568 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 +02005569 goto end;
5570 fail:
5571 /* unparsable HTX messages, too large ones to be produced in the local
5572 * list etc go here (unrecoverable errors).
5573 */
5574 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5575 ret = 0;
5576 goto end;
5577}
5578
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005579/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005580 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5581 * caller must check the stream's status to detect any error which might have
5582 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005583 * consumed, or zero if nothing done.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005584 */
Christopher Faulet142854b2020-12-02 15:12:40 +01005585static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005586{
5587 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005588 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005589 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005590 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005591 size_t total = 0;
5592 int es_now = 0;
5593 int bsize; /* htx block size */
5594 int fsize; /* h2 frame size */
5595 struct htx_blk *blk;
5596 enum htx_blk_type type;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005597 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005598
Willy Tarreau7838a792019-08-12 18:42:03 +02005599 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5600
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005601 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005602 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005603 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005604 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005605 goto end;
5606 }
5607
Willy Tarreau98de12a2018-12-12 07:03:00 +01005608 htx = htx_from_buf(buf);
5609
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005610 /* We only come here with HTX_BLK_DATA blocks */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005611
5612 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005613 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005614 goto end;
5615
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005616 if ((h2c->flags & H2_CF_IS_BACK) &&
Christopher Fauletf95f8762021-01-22 11:59:07 +01005617 (h2s->flags & (H2_SF_HEADERS_RCVD|H2_SF_BODY_TUNNEL)) == H2_SF_BODY_TUNNEL) {
5618 /* The response HEADERS frame not received yet. Thus the tunnel
5619 * is not fully established yet. In this situation, we block
5620 * data sending.
5621 */
5622 h2s->flags |= H2_SF_BLK_MBUSY;
5623 TRACE_STATE("Request DATA frame blocked waiting for tunnel establishment", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5624 goto end;
5625 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01005626 else if ((h2c->flags & H2_CF_IS_BACK) && (h2s->flags & H2_SF_TUNNEL_ABRT)) {
5627 /* a tunnel attempt was aborted but the is pending raw data to xfer to the server.
5628 * Thus the stream is closed with the CANCEL error. The error will be reported to
5629 * the upper layer as aserver abort. But at this stage there is nothing more we can
5630 * do. We just wait for the end of the response to be sure to not truncate it.
5631 */
5632 if (!(h2s->flags & H2_SF_ES_RCVD)) {
5633 TRACE_STATE("Request DATA frame blocked waiting end of aborted tunnel", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5634 h2s->flags |= H2_SF_BLK_MBUSY;
5635 }
5636 else {
5637 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
5638 h2s_error(h2s, H2_ERR_CANCEL);
5639 }
5640 goto end;
5641 }
Willy Tarreau98de12a2018-12-12 07:03:00 +01005642
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005643 blk = htx_get_head_blk(htx);
5644 type = htx_get_blk_type(blk);
5645 bsize = htx_get_blksz(blk);
5646 fsize = bsize;
5647 trunc_out = 0;
5648 if (type != HTX_BLK_DATA)
5649 goto end;
5650
Willy Tarreau9c218e72019-05-26 10:08:28 +02005651 mbuf = br_tail(h2c->mbuf);
5652 retry:
5653 if (!h2_get_buf(h2c, mbuf)) {
5654 h2c->flags |= H2_CF_MUX_MALLOC;
5655 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005656 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 +02005657 goto end;
5658 }
5659
Willy Tarreau98de12a2018-12-12 07:03:00 +01005660 /* Perform some optimizations to reduce the number of buffer copies.
5661 * First, if the mux's buffer is empty and the htx area contains
5662 * exactly one data block of the same size as the requested count, and
5663 * this count fits within the frame size, the stream's window size, and
5664 * the connection's window size, then it's possible to simply swap the
5665 * caller's buffer with the mux's output buffer and adjust offsets and
5666 * length to match the entire DATA HTX block in the middle. In this
5667 * case we perform a true zero-copy operation from end-to-end. This is
5668 * the situation that happens all the time with large files. Second, if
5669 * this is not possible, but the mux's output buffer is empty, we still
5670 * have an opportunity to avoid the copy to the intermediary buffer, by
5671 * making the intermediary buffer's area point to the output buffer's
5672 * area. In this case we want to skip the HTX header to make sure that
5673 * copies remain aligned and that this operation remains possible all
5674 * the time. This goes for headers, data blocks and any data extracted
5675 * from the HTX blocks.
5676 */
5677 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005678 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005679 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005680 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005681
Willy Tarreaubcc45952019-05-26 10:05:50 +02005682 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005683 /* Too bad there are data left there. We're willing to memcpy/memmove
5684 * up to 1/4 of the buffer, which means that it's OK to copy a large
5685 * frame into a buffer containing few data if it needs to be realigned,
5686 * and that it's also OK to copy few data without realigning. Otherwise
5687 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005688 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005689 if (fsize + 9 <= b_room(mbuf) &&
5690 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005691 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5692 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 +01005693 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005694 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005695
Willy Tarreau9c218e72019-05-26 10:08:28 +02005696 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5697 goto retry;
5698
Willy Tarreau98de12a2018-12-12 07:03:00 +01005699 h2c->flags |= H2_CF_MUX_MFULL;
5700 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005701 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 +01005702 goto end;
5703 }
5704
5705 /* map an H2 frame to the HTX block so that we can put the
5706 * frame header there.
5707 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005708 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5709 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005710
5711 /* prepend an H2 DATA frame header just before the DATA block */
5712 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5713 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5714 h2_set_frame_size(outbuf.area, fsize);
5715
5716 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005717 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005718 h2c->mws -= fsize;
5719
5720 /* and exchange with our old area */
5721 buf->area = old_area;
5722 buf->data = buf->head = 0;
5723 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005724
5725 TRACE_PROTO("sent H2 DATA frame (zero-copy)", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005726 goto end;
5727 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005728
Willy Tarreau98de12a2018-12-12 07:03:00 +01005729 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005730 /* for DATA and EOM we'll have to emit a frame, even if empty */
5731
5732 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005733 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5734 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005735 break;
5736 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005737 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005738 }
5739
5740 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005741 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5742 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005743 h2c->flags |= H2_CF_MUX_MFULL;
5744 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005745 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005746 goto end;
5747 }
5748
5749 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5750 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5751 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5752 outbuf.data = 9;
5753
5754 /* we have in <fsize> the exact number of bytes we need to copy from
5755 * the HTX buffer. We need to check this against the connection's and
5756 * the stream's send windows, and to ensure that this fits in the max
5757 * frame size and in the buffer's available space minus 9 bytes (for
5758 * the frame header). The connection's flow control is applied last so
5759 * that we can use a separate list of streams which are immediately
5760 * unblocked on window opening. Note: we don't implement padding.
5761 */
5762
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005763 if (!fsize)
5764 goto send_empty;
5765
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005766 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005767 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreau2b718102021-04-21 07:32:39 +02005768 if (LIST_INLIST(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005769 LIST_DEL_INIT(&h2s->list);
Willy Tarreau2b718102021-04-21 07:32:39 +02005770 LIST_APPEND(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005771 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 +01005772 goto end;
5773 }
5774
Willy Tarreauee573762018-12-04 15:25:57 +01005775 if (fsize > count)
5776 fsize = count;
5777
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005778 if (fsize > h2s_mws(h2s))
5779 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005780
5781 if (h2c->mfs && fsize > h2c->mfs)
5782 fsize = h2c->mfs; // >0
5783
5784 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005785 /* It doesn't fit at once. If it at least fits once split and
5786 * the amount of data to move is low, let's defragment the
5787 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005788 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005789 if (b_space_wraps(mbuf) &&
5790 (fsize + 9 <= b_room(mbuf)) &&
5791 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005792 goto realign_again;
5793 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005794 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005795
5796 if (fsize <= 0) {
5797 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005798 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5799 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005800 h2c->flags |= H2_CF_MUX_MFULL;
5801 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005802 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005803 goto end;
5804 }
5805 }
5806
5807 if (h2c->mws <= 0) {
5808 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005809 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 +01005810 goto end;
5811 }
5812
5813 if (fsize > h2c->mws)
5814 fsize = h2c->mws;
5815
5816 /* now let's copy this this into the output buffer */
5817 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005818 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005819 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005820 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005821
5822 send_empty:
5823 /* update the frame's size */
5824 h2_set_frame_size(outbuf.area, fsize);
5825
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005826 /* consume incoming HTX block */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005827 total += fsize;
5828 if (fsize == bsize) {
5829 htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005830 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5831 /* EOM+empty: we may need to add END_STREAM (except for tunneled
5832 * message)
5833 */
5834 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5835 es_now = 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02005836 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005837 }
5838 else {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005839 /* we've truncated this block */
5840 htx_cut_data_blk(htx, blk, fsize);
5841 }
5842
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005843 if (es_now)
5844 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5845
5846 /* commit the H2 response */
5847 b_add(mbuf, fsize + 9);
5848
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005849 if (es_now) {
5850 if (h2s->st == H2_SS_OPEN)
5851 h2s->st = H2_SS_HLOC;
5852 else
5853 h2s_close(h2s);
5854
5855 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005856 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 +01005857 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005858 else if (fsize) {
5859 if (fsize == bsize) {
5860 TRACE_DEVEL("more data may be available, trying to send another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5861 goto new_frame;
5862 }
5863 else if (trunc_out) {
5864 /* we've truncated this block */
5865 goto new_frame;
5866 }
5867 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005868
5869 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005870 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005871 return total;
5872}
5873
Christopher Faulet991febd2020-12-02 15:17:31 +01005874/* Skip the message payload (DATA blocks) and emit an empty DATA frame with the
5875 * ES flag set for stream <h2s>. This function is called for response known to
5876 * have no payload. Only DATA blocks are skipped. This means the trailers are
Ilya Shipitsinacf84592021-02-06 22:29:08 +05005877 * still emitted. The caller must check the stream's status to detect any error
Christopher Faulet991febd2020-12-02 15:17:31 +01005878 * which might have happened subsequently to a successful send. Returns the
5879 * number of data bytes consumed, or zero if nothing done.
5880 */
5881static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count)
5882{
5883 struct h2c *h2c = h2s->h2c;
5884 struct htx *htx;
5885 int bsize; /* htx block size */
5886 int fsize; /* h2 frame size */
5887 struct htx_blk *blk;
5888 enum htx_blk_type type;
5889 size_t total = 0;
5890
5891 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5892
5893 if (h2c_mux_busy(h2c, h2s)) {
5894 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5895 h2s->flags |= H2_SF_BLK_MBUSY;
5896 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5897 goto end;
5898 }
5899
5900 htx = htx_from_buf(buf);
5901
5902 next_data:
5903 if (!count || htx_is_empty(htx))
5904 goto end;
5905 blk = htx_get_head_blk(htx);
5906 type = htx_get_blk_type(blk);
5907 bsize = htx_get_blksz(blk);
5908 fsize = bsize;
5909 if (type != HTX_BLK_DATA)
5910 goto end;
5911
5912 if (fsize > count)
5913 fsize = count;
5914
5915 if (fsize != bsize)
5916 goto skip_data;
5917
5918 if (!(htx->flags & HTX_FL_EOM) || !htx_is_unique_blk(htx, blk))
5919 goto skip_data;
5920
5921 /* Here, it is the last block and it is also the end of the message. So
5922 * we can emit an empty DATA frame with the ES flag set
5923 */
5924 if (h2_send_empty_data_es(h2s) <= 0)
5925 goto end;
5926
5927 if (h2s->st == H2_SS_OPEN)
5928 h2s->st = H2_SS_HLOC;
5929 else
5930 h2s_close(h2s);
5931
5932 skip_data:
5933 /* consume incoming HTX block */
5934 total += fsize;
5935 if (fsize == bsize) {
5936 TRACE_DEVEL("more data may be available, trying to skip another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5937 htx_remove_blk(htx, blk);
5938 goto next_data;
5939 }
5940 else {
5941 /* we've truncated this block */
5942 htx_cut_data_blk(htx, blk, fsize);
5943 }
5944
5945 end:
5946 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5947 return total;
5948}
5949
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005950/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5951 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5952 * processed. The caller must check the stream's status to detect any error
5953 * which might have happened subsequently to a successful send. The htx blocks
5954 * are automatically removed from the message. The htx message is assumed to be
5955 * valid since produced from the internal code. Processing stops when meeting
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005956 * the EOT, which *is* removed. All trailers are processed at once and sent as a
5957 * single frame. The ES flag is always set.
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005958 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005959static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005960{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005961 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005962 struct h2c *h2c = h2s->h2c;
5963 struct htx_blk *blk;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005964 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005965 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005966 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005967 int ret = 0;
5968 int hdr;
5969 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005970
Willy Tarreau7838a792019-08-12 18:42:03 +02005971 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5972
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005973 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005974 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005975 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005976 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005977 goto end;
5978 }
5979
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005980 /* get trailers. */
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005981 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005982 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005983 type = htx_get_blk_type(blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005984
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005985 if (type == HTX_BLK_UNUSED)
5986 continue;
5987
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005988 if (type == HTX_BLK_EOT)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005989 break;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005990 if (type == HTX_BLK_TLR) {
5991 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5992 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5993 goto fail;
5994 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005995
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005996 list[hdr].n = htx_get_blk_name(htx, blk);
5997 list[hdr].v = htx_get_blk_value(htx, blk);
5998 hdr++;
5999 }
6000 else {
6001 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 +01006002 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02006003 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006004 }
6005
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006006 /* marker for end of trailers */
6007 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006008
Willy Tarreau9c218e72019-05-26 10:08:28 +02006009 mbuf = br_tail(h2c->mbuf);
6010 retry:
6011 if (!h2_get_buf(h2c, mbuf)) {
6012 h2c->flags |= H2_CF_MUX_MALLOC;
6013 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02006014 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 +02006015 goto end;
6016 }
6017
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006018 chunk_reset(&outbuf);
6019
6020 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02006021 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
6022 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006023 break;
6024 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02006025 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006026 }
6027
6028 if (outbuf.size < 9)
6029 goto full;
6030
6031 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
6032 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
6033 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
6034 outbuf.data = 9;
6035
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006036 /* encode all headers */
6037 for (idx = 0; idx < hdr; idx++) {
6038 /* these ones do not exist in H2 or must not appear in
6039 * trailers and must be dropped.
6040 */
6041 if (isteq(list[idx].n, ist("host")) ||
6042 isteq(list[idx].n, ist("content-length")) ||
6043 isteq(list[idx].n, ist("connection")) ||
6044 isteq(list[idx].n, ist("proxy-connection")) ||
6045 isteq(list[idx].n, ist("keep-alive")) ||
6046 isteq(list[idx].n, ist("upgrade")) ||
6047 isteq(list[idx].n, ist("te")) ||
6048 isteq(list[idx].n, ist("transfer-encoding")))
6049 continue;
6050
Christopher Faulet86d144c2019-08-14 16:32:25 +02006051 /* Skip all pseudo-headers */
6052 if (*(list[idx].n.ptr) == ':')
6053 continue;
6054
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006055 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
6056 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02006057 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006058 goto realign_again;
6059 goto full;
6060 }
6061 }
6062
Willy Tarreau5121e5d2019-05-06 15:13:41 +02006063 if (outbuf.data == 9) {
6064 /* here we have a problem, we have nothing to emit (either we
6065 * received an empty trailers block followed or we removed its
6066 * contents above). Because of this we can't send a HEADERS
6067 * frame, so we have to cheat and instead send an empty DATA
6068 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01006069 */
6070 outbuf.area[3] = H2_FT_DATA;
6071 outbuf.area[4] = H2_F_DATA_END_STREAM;
6072 }
6073
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006074 /* update the frame's size */
6075 h2_set_frame_size(outbuf.area, outbuf.data - 9);
6076
Willy Tarreau572d9f52019-10-11 16:58:37 +02006077 if (outbuf.data > h2c->mfs + 9) {
6078 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
6079 /* output full */
6080 if (b_space_wraps(mbuf))
6081 goto realign_again;
6082 goto full;
6083 }
6084 }
6085
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006086 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02006087 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 +02006088 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006089 h2s->flags |= H2_SF_ES_SENT;
6090
6091 if (h2s->st == H2_SS_OPEN)
6092 h2s->st = H2_SS_HLOC;
6093 else
6094 h2s_close(h2s);
6095
6096 /* OK we could properly deliver the response */
6097 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02006098 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006099 ret = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006100 blk = htx_get_head_blk(htx);
6101 while (blk) {
6102 type = htx_get_blk_type(blk);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006103 ret += htx_get_blksz(blk);
6104 blk = htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006105 /* The removed block is the EOT */
6106 if (type == HTX_BLK_EOT)
6107 break;
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006108 }
6109
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006110 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02006111 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006112 return ret;
6113 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02006114 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
6115 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006116 h2c->flags |= H2_CF_MUX_MFULL;
6117 h2s->flags |= H2_SF_BLK_MROOM;
6118 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006119 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 +01006120 goto end;
6121 fail:
6122 /* unparsable HTX messages, too large ones to be produced in the local
6123 * list etc go here (unrecoverable errors).
6124 */
6125 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
6126 ret = 0;
6127 goto end;
6128}
6129
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006130/* Called from the upper layer, to subscribe <es> to events <event_type>. The
6131 * event subscriber <es> is not allowed to change from a previous call as long
6132 * as at least one event is still subscribed. The <event_type> must only be a
6133 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006134 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006135static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02006136{
Olivier Houchard6ff20392018-07-17 18:46:31 +02006137 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02006138 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006139
Willy Tarreau7838a792019-08-12 18:42:03 +02006140 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006141
6142 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006143 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006144
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006145 es->events |= event_type;
6146 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006147
6148 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006149 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006150
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006151 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006152 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02006153 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
Willy Tarreau2b718102021-04-21 07:32:39 +02006154 !LIST_INLIST(&h2s->list)) {
Olivier Houchardf8338152019-05-14 17:50:32 +02006155 if (h2s->flags & H2_SF_BLK_MFCTL)
Willy Tarreau2b718102021-04-21 07:32:39 +02006156 LIST_APPEND(&h2c->fctl_list, &h2s->list);
Olivier Houchardf8338152019-05-14 17:50:32 +02006157 else
Willy Tarreau2b718102021-04-21 07:32:39 +02006158 LIST_APPEND(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02006159 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02006160 }
Willy Tarreau7838a792019-08-12 18:42:03 +02006161 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006162 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006163}
6164
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006165/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
6166 * The <es> pointer is not allowed to differ from the one passed to the
6167 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006168 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006169static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006170{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006171 struct h2s *h2s = cs->ctx;
6172
Willy Tarreau7838a792019-08-12 18:42:03 +02006173 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006174
6175 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006176 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006177
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006178 es->events &= ~event_type;
6179 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01006180 h2s->subs = NULL;
6181
6182 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006183 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006184
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006185 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006186 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006187 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006188 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
6189 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02006190 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01006191
Willy Tarreau7838a792019-08-12 18:42:03 +02006192 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006193 return 0;
6194}
6195
6196
Olivier Houchard511efea2018-08-16 15:30:32 +02006197/* Called from the upper layer, to receive data */
6198static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
6199{
Olivier Houchard638b7992018-08-16 15:41:52 +02006200 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01006201 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01006202 struct htx *h2s_htx = NULL;
6203 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02006204 size_t ret = 0;
6205
Willy Tarreau7838a792019-08-12 18:42:03 +02006206 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
6207
Olivier Houchard511efea2018-08-16 15:30:32 +02006208 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006209 h2s_htx = htx_from_buf(&h2s->rxbuf);
6210 if (htx_is_empty(h2s_htx)) {
6211 /* Here htx_to_buf() will set buffer data to 0 because
6212 * the HTX is empty.
6213 */
6214 htx_to_buf(h2s_htx, &h2s->rxbuf);
6215 goto end;
6216 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01006217
Christopher Faulet9b79a102019-07-15 11:22:56 +02006218 ret = h2s_htx->data;
6219 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01006220
Christopher Faulet9b79a102019-07-15 11:22:56 +02006221 /* <buf> is empty and the message is small enough, swap the
6222 * buffers. */
6223 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01006224 htx_to_buf(buf_htx, buf);
6225 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006226 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
6227 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01006228 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02006229
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006230 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_UNUSED);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006231
6232 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
6233 buf_htx->flags |= HTX_FL_PARSING_ERROR;
6234 if (htx_is_empty(buf_htx))
6235 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01006236 }
Christopher Faulet810df062020-07-22 16:20:34 +02006237 else if (htx_is_empty(h2s_htx))
Christopher Faulet42432f32020-11-20 17:43:16 +01006238 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006239
Christopher Faulet9b79a102019-07-15 11:22:56 +02006240 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
6241 htx_to_buf(buf_htx, buf);
6242 htx_to_buf(h2s_htx, &h2s->rxbuf);
6243 ret -= h2s_htx->data;
6244
Christopher Faulet37070b22019-02-14 15:12:14 +01006245 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02006246 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01006247 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006248 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01006249 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletd0db4232021-01-22 11:46:30 +01006250 if (h2s->flags & H2_SF_ES_RCVD) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02006251 cs->flags |= CS_FL_EOI;
Christopher Fauletd0db4232021-01-22 11:46:30 +01006252 /* Add EOS flag for tunnel */
6253 if (h2s->flags & H2_SF_BODY_TUNNEL)
6254 cs->flags |= CS_FL_EOS;
6255 }
Christopher Fauletaade4ed2020-10-08 15:38:41 +02006256 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02006257 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01006258 if (cs->flags & CS_FL_ERR_PENDING)
6259 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02006260 if (b_size(&h2s->rxbuf)) {
6261 b_free(&h2s->rxbuf);
Willy Tarreau4d77bbf2021-02-20 12:02:46 +01006262 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02006263 }
Olivier Houchard511efea2018-08-16 15:30:32 +02006264 }
6265
Willy Tarreau082f5592018-11-25 08:03:32 +01006266 if (ret && h2c->dsi == h2s->id) {
6267 /* demux is blocking on this stream's buffer */
6268 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02006269 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01006270 }
Christopher Faulet37070b22019-02-14 15:12:14 +01006271
Willy Tarreau7838a792019-08-12 18:42:03 +02006272 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02006273 return ret;
6274}
6275
Olivier Houchardd846c262018-10-19 17:24:29 +02006276
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006277/* Called from the upper layer, to send data from buffer <buf> for no more than
6278 * <count> bytes. Returns the number of bytes effectively sent. Some status
6279 * flags may be updated on the conn_stream.
6280 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02006281static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02006282{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006283 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02006284 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02006285 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006286 struct htx *htx;
6287 struct htx_blk *blk;
6288 enum htx_blk_type btype;
6289 uint32_t bsize;
6290 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006291
Willy Tarreau7838a792019-08-12 18:42:03 +02006292 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
6293
Olivier Houchardd360ac62019-03-22 17:37:16 +01006294 /* If we were not just woken because we wanted to send but couldn't,
6295 * and there's somebody else that is waiting to send, do nothing,
6296 * we will subscribe later and be put at the end of the list
6297 */
Willy Tarreaud9464162020-01-10 18:25:07 +01006298 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02006299 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
6300 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 +01006301 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006302 }
Willy Tarreaud9464162020-01-10 18:25:07 +01006303 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02006304
Willy Tarreau7838a792019-08-12 18:42:03 +02006305 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
6306 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 +02006307 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006308 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006309
Willy Tarreaucab22952019-10-31 15:48:18 +01006310 if (h2s->h2c->st0 >= H2_CS_ERROR) {
6311 cs->flags |= CS_FL_ERROR;
6312 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);
6313 return 0;
6314 }
6315
Christopher Faulet9b79a102019-07-15 11:22:56 +02006316 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006317
Willy Tarreau0bad0432018-06-14 16:54:01 +02006318 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01006319 h2s->flags |= H2_SF_OUTGOING_DATA;
6320
Willy Tarreau751f2d02018-10-05 09:35:00 +02006321 if (h2s->id == 0) {
6322 int32_t id = h2c_get_next_sid(h2s->h2c);
6323
6324 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02006325 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02006326 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 +02006327 return 0;
6328 }
6329
6330 eb32_delete(&h2s->by_id);
6331 h2s->by_id.key = h2s->id = id;
6332 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01006333 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02006334 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
6335 }
6336
Christopher Faulet9b79a102019-07-15 11:22:56 +02006337 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
6338 count && !htx_is_empty(htx)) {
6339 idx = htx_get_head(htx);
6340 blk = htx_get_blk(htx, idx);
6341 btype = htx_get_blk_type(blk);
6342 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006343
Christopher Faulet9b79a102019-07-15 11:22:56 +02006344 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02006345 case HTX_BLK_REQ_SL:
6346 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006347 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02006348 if (ret > 0) {
6349 total += ret;
6350 count -= ret;
6351 if (ret < bsize)
6352 goto done;
6353 }
6354 break;
6355
Willy Tarreau115e83b2018-12-01 19:17:53 +01006356 case HTX_BLK_RES_SL:
6357 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006358 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01006359 if (ret > 0) {
6360 total += ret;
6361 count -= ret;
6362 if (ret < bsize)
6363 goto done;
6364 }
6365 break;
6366
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006367 case HTX_BLK_DATA:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006368 /* all these cause the emission of a DATA frame (possibly empty) */
Christopher Faulet991febd2020-12-02 15:17:31 +01006369 if (!(h2s->h2c->flags & H2_CF_IS_BACK) &&
6370 (h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BODYLESS_RESP)) == H2_SF_BODYLESS_RESP)
6371 ret = h2s_skip_data(h2s, buf, count);
6372 else
6373 ret = h2s_make_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006374 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01006375 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006376 total += ret;
6377 count -= ret;
6378 if (ret < bsize)
6379 goto done;
6380 }
6381 break;
6382
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006383 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006384 case HTX_BLK_EOT:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006385 /* This is the first trailers block, all the subsequent ones */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006386 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006387 if (ret > 0) {
6388 total += ret;
6389 count -= ret;
6390 if (ret < bsize)
6391 goto done;
6392 }
6393 break;
6394
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006395 default:
6396 htx_remove_blk(htx, blk);
6397 total += bsize;
6398 count -= bsize;
6399 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006400 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006401 }
6402
Christopher Faulet9b79a102019-07-15 11:22:56 +02006403 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02006404 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02006405 /* trim any possibly pending data after we close (extra CR-LF,
6406 * unprocessed trailers, abnormal extra data, ...)
6407 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02006408 total += count;
6409 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02006410 }
6411
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006412 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01006413 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006414 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 +01006415 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01006416 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01006417 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006418 }
6419
Christopher Faulet9b79a102019-07-15 11:22:56 +02006420 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02006421
Olivier Houchard7505f942018-08-21 18:10:44 +02006422 if (total > 0) {
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006423 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006424 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 +02006425 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006426 }
Olivier Houchardd846c262018-10-19 17:24:29 +02006427
Olivier Houchard7505f942018-08-21 18:10:44 +02006428 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006429 /* If we're waiting for flow control, and we got a shutr on the
6430 * connection, we will never be unlocked, so add an error on
6431 * the conn_stream.
6432 */
6433 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
6434 !b_data(&h2s->h2c->dbuf) &&
6435 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006436 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 +01006437 if (cs->flags & CS_FL_EOS)
6438 cs->flags |= CS_FL_ERROR;
6439 else
6440 cs->flags |= CS_FL_ERR_PENDING;
6441 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006442
Willy Tarreau5723f292020-01-10 15:16:57 +01006443 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6444 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006445 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006446 LIST_DEL_INIT(&h2s->list);
6447 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006448
Willy Tarreau7838a792019-08-12 18:42:03 +02006449 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006450 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006451}
6452
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006453/* for debugging with CLI's "show fd" command */
Willy Tarreau8050efe2021-01-21 08:26:06 +01006454static int h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006455{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006456 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006457 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006458 struct eb32_node *node;
6459 int fctl_cnt = 0;
6460 int send_cnt = 0;
6461 int tree_cnt = 0;
6462 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006463 struct buffer *hmbuf, *tmbuf;
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006464 int ret = 0;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006465
6466 if (!h2c)
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006467 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006468
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006469 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006470 fctl_cnt++;
6471
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006472 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006473 send_cnt++;
6474
Willy Tarreau3af37712018-12-18 14:34:41 +01006475 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006476 node = eb32_first(&h2c->streams_by_id);
6477 while (node) {
6478 h2s = container_of(node, struct h2s, by_id);
6479 tree_cnt++;
6480 if (!h2s->cs)
6481 orph_cnt++;
6482 node = eb32_next(node);
6483 }
6484
Willy Tarreau60f62682019-05-26 11:32:27 +02006485 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006486 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006487 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006488 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006489 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6490 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006491 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006492 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006493 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006494 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6495 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6496 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006497 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6498 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6499 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006500 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6501 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006502
6503 if (h2s) {
Willy Tarreaued4464e2021-01-20 15:50:03 +01006504 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 +02006505 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006506 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6507 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6508 h2s->cs);
6509 if (h2s->cs)
Willy Tarreau98e40b92021-01-20 16:27:01 +01006510 chunk_appendf(msg, "(.flg=0x%08x .data=%p)",
Willy Tarreau987c0632018-12-18 10:32:05 +01006511 h2s->cs->flags, h2s->cs->data);
Willy Tarreau98e40b92021-01-20 16:27:01 +01006512
6513 chunk_appendf(&trash, " .subs=%p", h2s->subs);
6514 if (h2s->subs) {
Christopher Faulet6c93c4e2021-02-25 10:06:29 +01006515 chunk_appendf(&trash, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet);
6516 chunk_appendf(&trash, " tl.calls=%d tl.ctx=%p tl.fct=",
6517 h2s->subs->tasklet->calls,
6518 h2s->subs->tasklet->context);
6519 if (h2s->subs->tasklet->calls >= 1000000)
6520 ret = 1;
6521 resolve_sym_name(&trash, NULL, h2s->subs->tasklet->process);
6522 chunk_appendf(&trash, ")");
Willy Tarreau98e40b92021-01-20 16:27:01 +01006523 }
Willy Tarreau987c0632018-12-18 10:32:05 +01006524 }
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006525 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006526}
Willy Tarreau62f52692017-10-08 23:01:42 +02006527
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006528/* Migrate the the connection to the current thread.
6529 * Return 0 if successful, non-zero otherwise.
6530 * Expected to be called with the old thread lock held.
6531 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006532static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006533{
6534 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006535 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006536
6537 if (fd_takeover(conn->handle.fd, conn) != 0)
6538 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006539
6540 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6541 /* We failed to takeover the xprt, even if the connection may
6542 * still be valid, flag it as error'd, as we have already
6543 * taken over the fd, and wake the tasklet, so that it will
6544 * destroy it.
6545 */
6546 conn->flags |= CO_FL_ERROR;
6547 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6548 return -1;
6549 }
6550
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006551 if (h2c->wait_event.events)
6552 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6553 h2c->wait_event.events, &h2c->wait_event);
6554 /* To let the tasklet know it should free itself, and do nothing else,
6555 * set its context to NULL.
6556 */
6557 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006558 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006559
6560 task = h2c->task;
6561 if (task) {
6562 task->context = NULL;
6563 h2c->task = NULL;
6564 __ha_barrier_store();
6565 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006566
6567 h2c->task = task_new(tid_bit);
6568 if (!h2c->task) {
6569 h2_release(h2c);
6570 return -1;
6571 }
6572 h2c->task->process = h2_timeout_task;
6573 h2c->task->context = h2c;
6574 }
6575 h2c->wait_event.tasklet = tasklet_new();
6576 if (!h2c->wait_event.tasklet) {
6577 h2_release(h2c);
6578 return -1;
6579 }
6580 h2c->wait_event.tasklet->process = h2_io_cb;
6581 h2c->wait_event.tasklet->context = h2c;
6582 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6583 SUB_RETRY_RECV, &h2c->wait_event);
6584
6585 return 0;
6586}
6587
Willy Tarreau62f52692017-10-08 23:01:42 +02006588/*******************************************************/
6589/* functions below are dedicated to the config parsers */
6590/*******************************************************/
6591
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006592/* config parser for global "tune.h2.header-table-size" */
6593static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006594 const struct proxy *defpx, const char *file, int line,
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006595 char **err)
6596{
6597 if (too_many_args(1, args, err, NULL))
6598 return -1;
6599
6600 h2_settings_header_table_size = atoi(args[1]);
6601 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6602 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6603 return -1;
6604 }
6605 return 0;
6606}
Willy Tarreau62f52692017-10-08 23:01:42 +02006607
Willy Tarreaue6baec02017-07-27 11:45:11 +02006608/* config parser for global "tune.h2.initial-window-size" */
6609static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006610 const struct proxy *defpx, const char *file, int line,
Willy Tarreaue6baec02017-07-27 11:45:11 +02006611 char **err)
6612{
6613 if (too_many_args(1, args, err, NULL))
6614 return -1;
6615
6616 h2_settings_initial_window_size = atoi(args[1]);
6617 if (h2_settings_initial_window_size < 0) {
6618 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6619 return -1;
6620 }
6621 return 0;
6622}
6623
Willy Tarreau5242ef82017-07-27 11:47:28 +02006624/* config parser for global "tune.h2.max-concurrent-streams" */
6625static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006626 const struct proxy *defpx, const char *file, int line,
Willy Tarreau5242ef82017-07-27 11:47:28 +02006627 char **err)
6628{
6629 if (too_many_args(1, args, err, NULL))
6630 return -1;
6631
6632 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006633 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006634 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6635 return -1;
6636 }
6637 return 0;
6638}
6639
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006640/* config parser for global "tune.h2.max-frame-size" */
6641static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
Willy Tarreau01825162021-03-09 09:53:46 +01006642 const struct proxy *defpx, const char *file, int line,
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006643 char **err)
6644{
6645 if (too_many_args(1, args, err, NULL))
6646 return -1;
6647
6648 h2_settings_max_frame_size = atoi(args[1]);
6649 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6650 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6651 return -1;
6652 }
6653 return 0;
6654}
6655
Willy Tarreau62f52692017-10-08 23:01:42 +02006656
6657/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006658/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006659/***************************************/
6660
6661/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006662static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006663 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006664 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006665 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006666 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006667 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006668 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006669 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006670 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006671 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006672 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006673 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006674 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006675 .shutr = h2_shutr,
6676 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006677 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006678 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006679 .takeover = h2_takeover,
Christopher Fauleta4600572021-03-08 15:28:28 +01006680 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK|MX_FL_NO_UPG,
Willy Tarreau62f52692017-10-08 23:01:42 +02006681 .name = "H2",
6682};
6683
Christopher Faulet32f61c02018-04-10 14:33:41 +02006684static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006685 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006686
Willy Tarreau0108d902018-11-25 19:14:37 +01006687INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6688
Willy Tarreau62f52692017-10-08 23:01:42 +02006689/* config keyword parsers */
6690static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006691 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006692 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006693 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006694 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006695 { 0, NULL, NULL }
6696}};
6697
Willy Tarreau0108d902018-11-25 19:14:37 +01006698INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006699
6700/* initialize internal structs after the config is parsed.
6701 * Returns zero on success, non-zero on error.
6702 */
6703static int init_h2()
6704{
6705 pool_head_hpack_tbl = create_pool("hpack_tbl",
6706 h2_settings_header_table_size,
6707 MEM_F_SHARED|MEM_F_EXACT);
Christopher Faulet52140992020-11-06 15:23:39 +01006708 if (!pool_head_hpack_tbl) {
6709 ha_alert("failed to allocate hpack_tbl memory pool\n");
6710 return (ERR_ALERT | ERR_FATAL);
6711 }
6712 return ERR_NONE;
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006713}
6714
6715REGISTER_POST_CHECK(init_h2);