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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
375static struct trace_source trace_h2 = {
376 .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 Tarreauac6322d2021-01-29 12:33:46 +0100554struct task *h2_timeout_task(struct task *t, void *context, unsigned short 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" */
559struct task *h2_io_cb(struct task *t, void *ctx, unsigned short 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 Tarreauac6322d2021-01-29 12:33:46 +0100563struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short 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 Tarreau44e973f2018-03-01 17:49:30 +0100778 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
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 Tarreau51330962019-05-26 09:38:07 +0200784 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
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 &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200796 b_alloc_margin(&h2s->rxbuf, 0)) {
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 Tarreau21046592020-02-26 10:39:36 +0100809 if (likely(!MT_LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100810 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
811 h2c->buf_wait.target = h2c;
812 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau86891272020-07-10 08:22:26 +0200813 MT_LIST_ADDQ(&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 Tarreau201840a2019-05-29 17:50:48 +0200822 offer_buffers(NULL, tasks_run_queue);
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 Tarreau201840a2019-05-29 17:50:48 +0200836 offer_buffers(NULL, tasks_run_queue);
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 Tarreau21046592020-02-26 10:39:36 +0100990 MT_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
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001010 HA_ATOMIC_ADD(&h2c->px_counters->open_conns, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001011 HA_ATOMIC_ADD(&h2c->px_counters->total_conns, 1);
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 Tarreau21046592020-02-26 10:39:36 +01001077 if (MT_LIST_ADDED(&h2c->buf_wait.list))
1078 MT_LIST_DEL(&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
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001094 HA_ATOMIC_SUB(&h2c->px_counters->open_conns, 1);
1095
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 }
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001374 HA_ATOMIC_SUB(&h2s->h2c->px_counters->open_streams, 1);
1375
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);
1396 offer_buffers(NULL, tasks_run_queue);
1397 }
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
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001461 HA_ATOMIC_ADD(&h2c->px_counters->open_streams, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001462 HA_ATOMIC_ADD(&h2c->px_counters->total_streams, 1);
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)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001684 if (ret1 < 0)
1685 sess_log(h2c->conn->owner);
1686
Amaury Denoyellea8879232020-10-27 17:16:03 +01001687 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn)) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01001688 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 +02001689 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01001690 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
1691 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001692 ret2 = 0;
1693 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001694 }
1695
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001696 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001697 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001698 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001699 out:
1700 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001701 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001702}
1703
Willy Tarreau01b44822018-10-03 14:26:37 +02001704/* Try to send a connection preface, then upon success try to send our
1705 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1706 * missing data. It may return an error in h2c.
1707 */
1708static int h2c_bck_send_preface(struct h2c *h2c)
1709{
1710 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001711 int ret = 0;
1712
1713 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001714
1715 if (h2c_mux_busy(h2c, NULL)) {
1716 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001717 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001718 }
1719
Willy Tarreaubcc45952019-05-26 10:05:50 +02001720 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001721 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001722 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001723 h2c->flags |= H2_CF_MUX_MALLOC;
1724 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001725 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001726 }
1727
1728 if (!b_data(res)) {
1729 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001730 ret = b_istput(res, ist(H2_CONN_PREFACE));
1731 if (unlikely(ret <= 0)) {
1732 if (!ret) {
1733 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1734 goto retry;
1735 h2c->flags |= H2_CF_MUX_MFULL;
1736 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001737 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001738 }
1739 else {
1740 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001741 ret = 0;
1742 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001743 }
1744 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001745 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001746 ret = h2c_send_settings(h2c);
1747 out:
1748 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1749 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001750}
1751
Willy Tarreau081d4722017-05-16 21:51:05 +02001752/* try to send a GOAWAY frame on the connection to report an error or a graceful
1753 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1754 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1755 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1756 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1757 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1758 * on unrecoverable failure. It will not attempt to send one again in this last
1759 * case so that it is safe to use h2c_error() to report such errors.
1760 */
1761static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1762{
1763 struct buffer *res;
1764 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001765 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001766
Willy Tarreau7838a792019-08-12 18:42:03 +02001767 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1768
1769 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1770 ret = 1; // claim that it worked
1771 goto out;
1772 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001773
1774 if (h2c_mux_busy(h2c, h2s)) {
1775 if (h2s)
1776 h2s->flags |= H2_SF_BLK_MBUSY;
1777 else
1778 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001779 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001780 }
1781
Willy Tarreau9c218e72019-05-26 10:08:28 +02001782 /* len: 8, type: 7, flags: none, sid: 0 */
1783 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1784
1785 if (h2c->last_sid < 0)
1786 h2c->last_sid = h2c->max_id;
1787
1788 write_n32(str + 9, h2c->last_sid);
1789 write_n32(str + 13, h2c->errcode);
1790
Willy Tarreaubcc45952019-05-26 10:05:50 +02001791 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001792 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001793 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001794 h2c->flags |= H2_CF_MUX_MALLOC;
1795 if (h2s)
1796 h2s->flags |= H2_SF_BLK_MROOM;
1797 else
1798 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001799 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001800 }
1801
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001802 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001803 if (unlikely(ret <= 0)) {
1804 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001805 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1806 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001807 h2c->flags |= H2_CF_MUX_MFULL;
1808 if (h2s)
1809 h2s->flags |= H2_SF_BLK_MROOM;
1810 else
1811 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001812 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001813 }
1814 else {
1815 /* we cannot report this error using GOAWAY, so we mark
1816 * it and claim a success.
1817 */
1818 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1819 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001820 ret = 1;
1821 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001822 }
1823 }
1824 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreauf965b2a2020-12-01 10:47:18 +01001825
1826 /* some codes are not for real errors, just attempts to close cleanly */
1827 switch (h2c->errcode) {
1828 case H2_ERR_NO_ERROR:
1829 case H2_ERR_ENHANCE_YOUR_CALM:
1830 case H2_ERR_REFUSED_STREAM:
1831 case H2_ERR_CANCEL:
1832 break;
1833 default:
1834 HA_ATOMIC_ADD(&h2c->px_counters->goaway_resp, 1);
1835 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001836 out:
1837 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001838 return ret;
1839}
1840
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001841/* Try to send an RST_STREAM frame on the connection for the indicated stream
1842 * during mux operations. This stream must be valid and cannot be closed
1843 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1844 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1845 * not yet.
1846 *
1847 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1848 * to write the message, it subscribes the stream to future notifications.
1849 */
1850static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1851{
1852 struct buffer *res;
1853 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001854 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001855
Willy Tarreau7838a792019-08-12 18:42:03 +02001856 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1857
1858 if (!h2s || h2s->st == H2_SS_CLOSED) {
1859 ret = 1;
1860 goto out;
1861 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001862
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001863 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1864 * RST_STREAM in response to a RST_STREAM frame.
1865 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001866 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001867 ret = 1;
1868 goto ignore;
1869 }
1870
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001871 if (h2c_mux_busy(h2c, h2s)) {
1872 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001873 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001874 }
1875
Willy Tarreau9c218e72019-05-26 10:08:28 +02001876 /* len: 4, type: 3, flags: none */
1877 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1878 write_n32(str + 5, h2s->id);
1879 write_n32(str + 9, h2s->errcode);
1880
Willy Tarreaubcc45952019-05-26 10:05:50 +02001881 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001882 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001883 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001884 h2c->flags |= H2_CF_MUX_MALLOC;
1885 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001886 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001887 }
1888
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001889 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001890 if (unlikely(ret <= 0)) {
1891 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001892 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1893 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001894 h2c->flags |= H2_CF_MUX_MFULL;
1895 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001896 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001897 }
1898 else {
1899 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001900 ret = 0;
1901 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001902 }
1903 }
1904
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001905 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001906 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001907 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001908 out:
1909 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001910 return ret;
1911}
1912
1913/* Try to send an RST_STREAM frame on the connection for the stream being
1914 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001915 * error code, even if the stream is one of the dummy ones, and will update
1916 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001917 *
1918 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1919 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001920 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001921 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001922 */
1923static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1924{
1925 struct buffer *res;
1926 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001927 int ret = 0;
1928
1929 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001930
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001931 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1932 * RST_STREAM in response to a RST_STREAM frame.
1933 */
1934 if (h2c->dft == H2_FT_RST_STREAM) {
1935 ret = 1;
1936 goto ignore;
1937 }
1938
Willy Tarreau27a84c92017-10-17 08:10:17 +02001939 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001940 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001941 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001942 }
1943
Willy Tarreau9c218e72019-05-26 10:08:28 +02001944 /* len: 4, type: 3, flags: none */
1945 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1946
1947 write_n32(str + 5, h2c->dsi);
1948 write_n32(str + 9, h2s->errcode);
1949
Willy Tarreaubcc45952019-05-26 10:05:50 +02001950 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001951 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001952 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001953 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001954 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001955 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001956 }
1957
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001958 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001959 if (unlikely(ret <= 0)) {
1960 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001961 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1962 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001963 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001964 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001965 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001966 }
1967 else {
1968 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001969 ret = 0;
1970 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001971 }
1972 }
1973
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001974 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001975 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001976 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001977 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001978 }
1979
Willy Tarreau7838a792019-08-12 18:42:03 +02001980 out:
Amaury Denoyellea8879232020-10-27 17:16:03 +01001981 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_resp, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001982 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001983 return ret;
1984}
1985
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001986/* try to send an empty DATA frame with the ES flag set to notify about the
1987 * end of stream and match a shutdown(write). If an ES was already sent as
1988 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1989 * on success or zero if nothing was done. In case of lack of room to write the
1990 * message, it subscribes the requesting stream to future notifications.
1991 */
1992static int h2_send_empty_data_es(struct h2s *h2s)
1993{
1994 struct h2c *h2c = h2s->h2c;
1995 struct buffer *res;
1996 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001997 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001998
Willy Tarreau7838a792019-08-12 18:42:03 +02001999 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
2000
2001 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
2002 ret = 1;
2003 goto out;
2004 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002005
2006 if (h2c_mux_busy(h2c, h2s)) {
2007 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002008 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002009 }
2010
Willy Tarreau9c218e72019-05-26 10:08:28 +02002011 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
2012 memcpy(str, "\x00\x00\x00\x00\x01", 5);
2013 write_n32(str + 5, h2s->id);
2014
Willy Tarreaubcc45952019-05-26 10:05:50 +02002015 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002016 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002017 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002018 h2c->flags |= H2_CF_MUX_MALLOC;
2019 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002020 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002021 }
2022
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002023 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002024 if (likely(ret > 0)) {
2025 h2s->flags |= H2_SF_ES_SENT;
2026 }
2027 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002028 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2029 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002030 h2c->flags |= H2_CF_MUX_MFULL;
2031 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002032 }
2033 else {
2034 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002035 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002036 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002037 out:
2038 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002039 return ret;
2040}
2041
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002042/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002043 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002044 * is automatically updated accordingly. If the stream is orphaned, it is
2045 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01002046 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002047static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01002048{
Willy Tarreau7838a792019-08-12 18:42:03 +02002049 struct h2c *h2c = h2s->h2c;
2050
2051 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
2052
Christopher Fauletf02ca002019-03-07 16:21:34 +01002053 if (!h2s->cs) {
2054 /* this stream was already orphaned */
2055 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002056 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002057 return;
2058 }
2059
Christopher Fauletaade4ed2020-10-08 15:38:41 +02002060 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002061 if (h2s->st == H2_SS_OPEN)
2062 h2s->st = H2_SS_HREM;
2063 else if (h2s->st == H2_SS_HLOC)
2064 h2s_close(h2s);
2065 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002066
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002067 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
2068 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
2069 h2s->cs->flags |= CS_FL_ERR_PENDING;
2070 if (h2s->cs->flags & CS_FL_EOS)
2071 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02002072
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002073 if (h2s->st < H2_SS_ERROR)
2074 h2s->st = H2_SS_ERROR;
2075 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01002076
2077 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002078 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002079}
2080
2081/* wake the streams attached to the connection, whose id is greater than <last>
2082 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002083 */
Willy Tarreau23482912019-05-07 15:23:14 +02002084static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002085{
2086 struct eb32_node *node;
2087 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002088
Willy Tarreau7838a792019-08-12 18:42:03 +02002089 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
2090
Christopher Fauletf02ca002019-03-07 16:21:34 +01002091 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002092 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
2093 while (node) {
2094 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002095 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002096 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002097 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01002098
Christopher Fauletf02ca002019-03-07 16:21:34 +01002099 /* Wake all streams with unassigned ID (ID == 0) */
2100 node = eb32_lookup(&h2c->streams_by_id, 0);
2101 while (node) {
2102 h2s = container_of(node, struct h2s, by_id);
2103 if (h2s->id > 0)
2104 break;
2105 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002106 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002107 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002108
2109 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002110}
2111
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002112/* Wake up all blocked streams whose window size has become positive after the
2113 * mux's initial window was adjusted. This should be done after having processed
2114 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002115 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002116static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02002117{
2118 struct h2s *h2s;
2119 struct eb32_node *node;
2120
Willy Tarreau7838a792019-08-12 18:42:03 +02002121 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2122
Willy Tarreau3421aba2017-07-27 15:41:03 +02002123 node = eb32_first(&h2c->streams_by_id);
2124 while (node) {
2125 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002126 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002127 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002128 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002129 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2130 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002131 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002132 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002133 node = eb32_next(node);
2134 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002135
2136 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002137}
2138
2139/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
2140 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01002141 * return an error in h2c. The caller must have already verified frame length
2142 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002143 */
2144static int h2c_handle_settings(struct h2c *h2c)
2145{
2146 unsigned int offset;
2147 int error;
2148
Willy Tarreau7838a792019-08-12 18:42:03 +02002149 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2150
Willy Tarreau3421aba2017-07-27 15:41:03 +02002151 if (h2c->dff & H2_F_SETTINGS_ACK) {
2152 if (h2c->dfl) {
2153 error = H2_ERR_FRAME_SIZE_ERROR;
2154 goto fail;
2155 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002156 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002157 }
2158
Willy Tarreau3421aba2017-07-27 15:41:03 +02002159 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002160 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002161 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002162
2163 /* parse the frame */
2164 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002165 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2166 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002167
2168 switch (type) {
2169 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2170 /* we need to update all existing streams with the
2171 * difference from the previous iws.
2172 */
2173 if (arg < 0) { // RFC7540#6.5.2
2174 error = H2_ERR_FLOW_CONTROL_ERROR;
2175 goto fail;
2176 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002177 h2c->miw = arg;
2178 break;
2179 case H2_SETTINGS_MAX_FRAME_SIZE:
2180 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002181 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 +02002182 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002183 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002184 goto fail;
2185 }
2186 h2c->mfs = arg;
2187 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002188 case H2_SETTINGS_ENABLE_PUSH:
2189 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002190 TRACE_ERROR("ENABLE_PUSH out of range", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002191 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002192 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002193 goto fail;
2194 }
2195 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002196 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2197 if (h2c->flags & H2_CF_IS_BACK) {
2198 /* the limit is only for the backend; for the frontend it is our limit */
2199 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2200 arg = h2_settings_max_concurrent_streams;
2201 h2c->streams_limit = arg;
2202 }
2203 break;
Amaury Denoyellef9dcbee2020-12-11 17:53:10 +01002204 case H2_SETTINGS_ENABLE_CONNECT_PROTOCOL:
2205 /* nothing to do here as this settings is automatically
2206 * transmits to the client */
2207 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002208 }
2209 }
2210
2211 /* need to ACK this frame now */
2212 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002213 done:
2214 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002215 return 1;
2216 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002217 if (!(h2c->flags & H2_CF_IS_BACK))
2218 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002219 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002220 out0:
2221 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 +02002222 return 0;
2223}
2224
2225/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2226 * success or one of the h2_status values.
2227 */
2228static int h2c_ack_settings(struct h2c *h2c)
2229{
2230 struct buffer *res;
2231 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002232 int ret = 0;
2233
2234 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002235
2236 if (h2c_mux_busy(h2c, NULL)) {
2237 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002238 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002239 }
2240
Willy Tarreau9c218e72019-05-26 10:08:28 +02002241 memcpy(str,
2242 "\x00\x00\x00" /* length : 0 (no data) */
2243 "\x04" "\x01" /* type : 4, flags : ACK */
2244 "\x00\x00\x00\x00" /* stream ID */, 9);
2245
Willy Tarreaubcc45952019-05-26 10:05:50 +02002246 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002247 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002248 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002249 h2c->flags |= H2_CF_MUX_MALLOC;
2250 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002251 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002252 }
2253
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002254 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002255 if (unlikely(ret <= 0)) {
2256 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002257 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2258 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002259 h2c->flags |= H2_CF_MUX_MFULL;
2260 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002261 }
2262 else {
2263 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002264 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002265 }
2266 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002267 out:
2268 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002269 return ret;
2270}
2271
Willy Tarreaucf68c782017-10-10 17:11:41 +02002272/* processes a PING frame and schedules an ACK if needed. The caller must pass
2273 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002274 * missing data. The caller must have already verified frame length
2275 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002276 */
2277static int h2c_handle_ping(struct h2c *h2c)
2278{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002279 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002280 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002281 h2c->st0 = H2_CS_FRAME_A;
2282 return 1;
2283}
2284
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002285/* Try to send a window update for stream id <sid> and value <increment>.
2286 * Returns > 0 on success or zero on missing room or failure. It may return an
2287 * error in h2c.
2288 */
2289static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2290{
2291 struct buffer *res;
2292 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002293 int ret = 0;
2294
2295 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002296
2297 if (h2c_mux_busy(h2c, NULL)) {
2298 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002299 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002300 }
2301
Willy Tarreau9c218e72019-05-26 10:08:28 +02002302 /* length: 4, type: 8, flags: none */
2303 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2304 write_n32(str + 5, sid);
2305 write_n32(str + 9, increment);
2306
Willy Tarreaubcc45952019-05-26 10:05:50 +02002307 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002308 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002309 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002310 h2c->flags |= H2_CF_MUX_MALLOC;
2311 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002312 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002313 }
2314
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002315 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002316 if (unlikely(ret <= 0)) {
2317 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002318 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2319 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002320 h2c->flags |= H2_CF_MUX_MFULL;
2321 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002322 }
2323 else {
2324 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002325 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002326 }
2327 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002328 out:
2329 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002330 return ret;
2331}
2332
2333/* try to send pending window update for the connection. It's safe to call it
2334 * with no pending updates. Returns > 0 on success or zero on missing room or
2335 * failure. It may return an error in h2c.
2336 */
2337static int h2c_send_conn_wu(struct h2c *h2c)
2338{
2339 int ret = 1;
2340
Willy Tarreau7838a792019-08-12 18:42:03 +02002341 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2342
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002343 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002344 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002345
Willy Tarreau97aaa672018-12-23 09:49:04 +01002346 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2347 /* increase the advertised connection window to 2G on
2348 * first update.
2349 */
2350 h2c->flags |= H2_CF_WINDOW_OPENED;
2351 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2352 }
2353
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002354 /* send WU for the connection */
2355 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2356 if (ret > 0)
2357 h2c->rcvd_c = 0;
2358
Willy Tarreau7838a792019-08-12 18:42:03 +02002359 out:
2360 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002361 return ret;
2362}
2363
2364/* try to send pending window update for the current dmux stream. It's safe to
2365 * call it with no pending updates. Returns > 0 on success or zero on missing
2366 * room or failure. It may return an error in h2c.
2367 */
2368static int h2c_send_strm_wu(struct h2c *h2c)
2369{
2370 int ret = 1;
2371
Willy Tarreau7838a792019-08-12 18:42:03 +02002372 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2373
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002374 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002375 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002376
2377 /* send WU for the stream */
2378 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2379 if (ret > 0)
2380 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002381 out:
2382 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002383 return ret;
2384}
2385
Willy Tarreaucf68c782017-10-10 17:11:41 +02002386/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2387 * success, 0 on missing data or one of the h2_status values.
2388 */
2389static int h2c_ack_ping(struct h2c *h2c)
2390{
2391 struct buffer *res;
2392 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002393 int ret = 0;
2394
2395 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002396
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002397 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002398 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002399
2400 if (h2c_mux_busy(h2c, NULL)) {
2401 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002402 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002403 }
2404
Willy Tarreaucf68c782017-10-10 17:11:41 +02002405 memcpy(str,
2406 "\x00\x00\x08" /* length : 8 (same payload) */
2407 "\x06" "\x01" /* type : 6, flags : ACK */
2408 "\x00\x00\x00\x00" /* stream ID */, 9);
2409
2410 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002411 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002412
Willy Tarreau9c218e72019-05-26 10:08:28 +02002413 res = br_tail(h2c->mbuf);
2414 retry:
2415 if (!h2_get_buf(h2c, res)) {
2416 h2c->flags |= H2_CF_MUX_MALLOC;
2417 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002418 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002419 }
2420
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002421 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002422 if (unlikely(ret <= 0)) {
2423 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002424 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2425 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002426 h2c->flags |= H2_CF_MUX_MFULL;
2427 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002428 }
2429 else {
2430 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002431 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002432 }
2433 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002434 out:
2435 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002436 return ret;
2437}
2438
Willy Tarreau26f95952017-07-27 17:18:30 +02002439/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2440 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002441 * h2c or h2s. The caller must have already verified frame length and stream ID
2442 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002443 */
2444static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2445{
2446 int32_t inc;
2447 int error;
2448
Willy Tarreau7838a792019-08-12 18:42:03 +02002449 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2450
Willy Tarreau26f95952017-07-27 17:18:30 +02002451 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002452 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002453 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002454
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002455 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002456
2457 if (h2c->dsi != 0) {
2458 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002459
2460 /* it's not an error to receive WU on a closed stream */
2461 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002462 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002463
2464 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002465 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 +02002466 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002467 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002468 goto strm_err;
2469 }
2470
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002471 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002472 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 +02002473 error = H2_ERR_FLOW_CONTROL_ERROR;
Willy Tarreaua3075282020-12-01 10:22:43 +01002474 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002475 goto strm_err;
2476 }
2477
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002478 h2s->sws += inc;
2479 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002480 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002481 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002482 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2483 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Olivier Houcharddddfe312018-10-10 18:51:00 +02002484 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002485 }
2486 }
2487 else {
2488 /* connection window update */
2489 if (!inc) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002490 TRACE_ERROR("conn WINDOW_UPDATE inc=0", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002491 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002492 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002493 goto conn_err;
2494 }
2495
2496 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2497 error = H2_ERR_FLOW_CONTROL_ERROR;
2498 goto conn_err;
2499 }
2500
2501 h2c->mws += inc;
2502 }
2503
Willy Tarreau7838a792019-08-12 18:42:03 +02002504 done:
2505 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002506 return 1;
2507
2508 conn_err:
2509 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002510 out0:
2511 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 +02002512 return 0;
2513
2514 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002515 h2s_error(h2s, error);
2516 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002517 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002518 return 0;
2519}
2520
Willy Tarreaue96b0922017-10-30 00:28:29 +01002521/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002522 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2523 * have already verified frame length and stream ID validity. Described in
2524 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002525 */
2526static int h2c_handle_goaway(struct h2c *h2c)
2527{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002528 int last;
2529
Willy Tarreau7838a792019-08-12 18:42:03 +02002530 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002531 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002532 if (b_data(&h2c->dbuf) < h2c->dfl) {
2533 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002534 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002535 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002536
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002537 last = h2_get_n32(&h2c->dbuf, 0);
2538 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002539 if (h2c->last_sid < 0)
2540 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002541 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002542 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002543 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002544}
2545
Willy Tarreau92153fc2017-12-03 19:46:19 +01002546/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002547 * invalid. Returns > 0 on success or zero on missing data. It may return an
2548 * error in h2c. The caller must have already verified frame length and stream
2549 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002550 */
2551static int h2c_handle_priority(struct h2c *h2c)
2552{
Willy Tarreau7838a792019-08-12 18:42:03 +02002553 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2554
Willy Tarreau92153fc2017-12-03 19:46:19 +01002555 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002556 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002557 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002558 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002559 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002560
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002561 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002562 /* 7540#5.3 : can't depend on itself */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002563 TRACE_ERROR("PRIORITY depends on itself", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002564 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01002565 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002566 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002567 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002568 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002569 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002570 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002571}
2572
Willy Tarreaucd234e92017-08-18 10:59:39 +02002573/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002574 * Returns > 0 on success or zero on missing data. The caller must have already
2575 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002576 */
2577static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2578{
Willy Tarreau7838a792019-08-12 18:42:03 +02002579 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2580
Willy Tarreaucd234e92017-08-18 10:59:39 +02002581 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002582 if (b_data(&h2c->dbuf) < h2c->dfl) {
2583 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 +02002584 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002585 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002586
2587 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002588 if (h2s->st == H2_SS_CLOSED) {
2589 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 +02002590 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002591 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002592
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002593 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002594 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002595
2596 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002597 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002598 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002599 }
2600
2601 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002602 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002603 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002604}
2605
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002606/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2607 * It may return an error in h2c or h2s. The caller must consider that the
2608 * return value is the new h2s in case one was allocated (most common case).
2609 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002610 * errors here are reported as connection errors since it's impossible to
2611 * recover from such errors after the compression context has been altered.
2612 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002613static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002614{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002615 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002616 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002617 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002618 int error;
2619
Willy Tarreau7838a792019-08-12 18:42:03 +02002620 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2621
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002622 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002623 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002624
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002625 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002626 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002627
2628 /* now either the frame is complete or the buffer is complete */
2629 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002630 /* The stream exists/existed, this must be a trailers frame */
2631 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002632 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len, NULL);
Willy Tarreauaab1a602019-05-06 11:12:18 +02002633 /* unrecoverable error ? */
2634 if (h2c->st0 >= H2_CS_ERROR)
2635 goto out;
2636
2637 if (error == 0)
2638 goto out; // missing data
2639
2640 if (error < 0) {
2641 /* Failed to decode this frame (e.g. too large request)
2642 * but the HPACK decompressor is still synchronized.
2643 */
2644 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2645 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002646 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002647 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002648 goto done;
2649 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002650 /* the connection was already killed by an RST, let's consume
2651 * the data and send another RST.
2652 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002653 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau1f035502019-01-30 11:44:07 +01002654 h2s = (struct h2s*)h2_error_stream;
2655 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002656 }
2657 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2658 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2659 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002660 TRACE_ERROR("HEADERS on invalid stream ID", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002661 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002662 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002663 goto conn_err;
2664 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002665 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2666 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002667
Amaury Denoyelle74162742020-12-11 17:53:05 +01002668 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002669
Willy Tarreau25919232019-01-03 14:48:18 +01002670 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002671 if (h2c->st0 >= H2_CS_ERROR)
2672 goto out;
2673
Willy Tarreau25919232019-01-03 14:48:18 +01002674 if (error <= 0) {
2675 if (error == 0)
2676 goto out; // missing data
2677
2678 /* Failed to decode this stream (e.g. too large request)
2679 * but the HPACK decompressor is still synchronized.
2680 */
2681 h2s = (struct h2s*)h2_error_stream;
2682 goto send_rst;
2683 }
2684
Willy Tarreau22de8d32018-09-05 19:55:58 +02002685 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002686 * positively from h2c_frt_stream_new(), the stream will report the error,
2687 * and if we return in error, h2c_frt_stream_new() will emit the error.
Christopher Faulet7d013e72020-12-15 16:56:50 +01002688 *
2689 * Xfer the rxbuf to the stream. On success, the new stream owns the
2690 * rxbuf. On error, it is released here.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002691 */
Christopher Faulet7d013e72020-12-15 16:56:50 +01002692 h2s = h2c_frt_stream_new(h2c, h2c->dsi, &rxbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02002693 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002694 h2s = (struct h2s*)h2_refused_stream;
2695 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002696 }
2697
2698 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002699 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002700 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002701
Willy Tarreau88d138e2019-01-02 19:38:14 +01002702 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002703 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002704 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002705
2706 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002707 if (h2s->st == H2_SS_OPEN)
2708 h2s->st = H2_SS_HREM;
2709 else
2710 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002711 }
2712
Willy Tarreau3a429f02019-01-03 11:41:50 +01002713 /* update the max stream ID if the request is being processed */
2714 if (h2s->id > h2c->max_id)
2715 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002716
Willy Tarreau022e5e52020-09-10 09:33:15 +02002717 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 +01002718 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002719
2720 conn_err:
2721 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002722 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002723
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002724 out:
2725 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002726 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 +01002727 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002728
2729 send_rst:
2730 /* make the demux send an RST for the current stream. We may only
2731 * do this if we're certain that the HEADERS frame was properly
2732 * decompressed so that the HPACK decoder is still kept up to date.
2733 */
2734 h2_release_buf(h2c, &rxbuf);
2735 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002736
Willy Tarreau022e5e52020-09-10 09:33:15 +02002737 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 +02002738 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002739 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002740}
2741
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002742/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2743 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2744 * errors here are reported as connection errors since it's impossible to
2745 * recover from such errors after the compression context has been altered.
2746 */
2747static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2748{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002749 struct buffer rxbuf = BUF_NULL;
2750 unsigned long long body_len = 0;
2751 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002752 int error;
2753
Willy Tarreau7838a792019-08-12 18:42:03 +02002754 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2755
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002756 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002757 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002758
2759 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002760 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002761
Christopher Faulet6884aa32019-09-23 15:28:20 +02002762 if (h2s->st != H2_SS_CLOSED) {
Amaury Denoyelle74162742020-12-11 17:53:05 +01002763 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len, h2s->upgrade_protocol);
Christopher Faulet6884aa32019-09-23 15:28:20 +02002764 }
2765 else {
2766 /* the connection was already killed by an RST, let's consume
2767 * the data and send another RST.
2768 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01002769 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len, NULL);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002770 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002771 h2c->st0 = H2_CS_FRAME_E;
2772 goto send_rst;
2773 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002774
Willy Tarreau25919232019-01-03 14:48:18 +01002775 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002776 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002777 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002778
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002779 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2780 /* RFC7540#5.1 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002781 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 +01002782 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2783 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreaua3075282020-12-01 10:22:43 +01002784 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002785 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002786 }
2787
Willy Tarreau25919232019-01-03 14:48:18 +01002788 if (error <= 0) {
2789 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002790 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002791
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002792 /* stream error : send RST_STREAM */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002793 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 +01002794 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002795 h2c->st0 = H2_CS_FRAME_E;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002796 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002797 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002798 }
2799
Christopher Fauletfa922f02019-05-07 10:55:17 +02002800 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002801 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002802
Willy Tarreau927b88b2019-03-04 08:03:25 +01002803 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002804 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002805 else if (h2s->flags & H2_SF_ES_RCVD) {
2806 if (h2s->st == H2_SS_OPEN)
2807 h2s->st = H2_SS_HREM;
2808 else if (h2s->st == H2_SS_HLOC)
2809 h2s_close(h2s);
2810 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002811
Christopher Fauletf95f8762021-01-22 11:59:07 +01002812 /* Unblock busy server h2s waiting for the response headers to validate
2813 * the tunnel establishment or the end of the response of an oborted
2814 * tunnel
2815 */
2816 if ((h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY)) == (H2_SF_BODY_TUNNEL|H2_SF_BLK_MBUSY) ||
2817 (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)) {
2818 TRACE_STATE("Unblock h2s blocked on tunnel establishment/abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2819 h2s->flags &= ~H2_SF_BLK_MBUSY;
2820 }
2821
Willy Tarreau022e5e52020-09-10 09:33:15 +02002822 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 +02002823 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002824 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002825 fail:
2826 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2827 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002828
2829 send_rst:
2830 /* make the demux send an RST for the current stream. We may only
2831 * do this if we're certain that the HEADERS frame was properly
2832 * decompressed so that the HPACK decoder is still kept up to date.
2833 */
2834 h2_release_buf(h2c, &rxbuf);
2835 h2c->st0 = H2_CS_FRAME_E;
2836
Willy Tarreau022e5e52020-09-10 09:33:15 +02002837 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 +02002838 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2839 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002840}
2841
Willy Tarreau454f9052017-10-26 19:40:35 +02002842/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2843 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2844 */
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01002845static int h2c_handle_data(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02002846{
2847 int error;
2848
Willy Tarreau7838a792019-08-12 18:42:03 +02002849 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2850
Willy Tarreau454f9052017-10-26 19:40:35 +02002851 /* note that empty DATA frames are perfectly valid and sometimes used
2852 * to signal an end of stream (with the ES flag).
2853 */
2854
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002855 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002856 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002857
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002858 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002859 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002860
2861 /* now either the frame is complete or the buffer is complete */
2862
Willy Tarreau454f9052017-10-26 19:40:35 +02002863 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2864 /* RFC7540#6.1 */
2865 error = H2_ERR_STREAM_CLOSED;
2866 goto strm_err;
2867 }
2868
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002869 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002870 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002871 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 +01002872 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002873 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002874 goto strm_err;
2875 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01002876 if (!(h2c->flags & H2_CF_IS_BACK) &&
2877 (h2s->flags & (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT)) == (H2_SF_TUNNEL_ABRT|H2_SF_ES_SENT) &&
2878 ((h2c->dfl - h2c->dpl) || !(h2c->dff & H2_F_DATA_END_STREAM))) {
2879 /* a tunnel attempt was aborted but the client still try to send some raw data.
2880 * Thus the stream is closed with the CANCEL error. Here we take care it is not
2881 * an empty DATA Frame with the ES flag. The error is only handled if ES was
2882 * already sent to the client because depending on the scheduling, these data may
2883 * have been sent before the server respnse but not handle here.
2884 */
2885 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2886 error = H2_ERR_CANCEL;
2887 goto strm_err;
2888 }
Willy Tarreau1915ca22019-01-24 11:49:37 +01002889
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002890 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002891 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002892
Willy Tarreau454f9052017-10-26 19:40:35 +02002893 /* call the upper layers to process the frame, then let the upper layer
2894 * notify the stream about any change.
2895 */
2896 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002897 /* The upper layer has already closed, this may happen on
2898 * 4xx/redirects during POST, or when receiving a response
2899 * from an H2 server after the client has aborted.
2900 */
2901 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002902 goto strm_err;
2903 }
2904
Willy Tarreau8f650c32017-11-21 19:36:21 +01002905 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002906 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002907
Willy Tarreau721c9742017-11-07 11:05:42 +01002908 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002909 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002910 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002911 }
2912
2913 /* check for completion : the callee will change this to FRAME_A or
2914 * FRAME_H once done.
2915 */
2916 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002917 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002918
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002919 /* last frame */
2920 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002921 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002922 if (h2s->st == H2_SS_OPEN)
2923 h2s->st = H2_SS_HREM;
2924 else
2925 h2s_close(h2s);
2926
Willy Tarreau1915ca22019-01-24 11:49:37 +01002927 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2928 /* RFC7540#8.1.2 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002929 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 +01002930 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002931 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002932 goto strm_err;
2933 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002934 }
2935
Christopher Fauletf95f8762021-01-22 11:59:07 +01002936 /* Unblock busy server h2s waiting for the end of the response for an
2937 * aborted tunnel
2938 */
2939 if ((h2c->flags & H2_CF_IS_BACK) &&
2940 (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)) {
2941 TRACE_STATE("Unblock h2s blocked on tunnel abort", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2942 h2s->flags &= ~H2_SF_BLK_MBUSY;
2943 }
2944
Willy Tarreau7838a792019-08-12 18:42:03 +02002945 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002946 return 1;
2947
Willy Tarreau454f9052017-10-26 19:40:35 +02002948 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002949 h2s_error(h2s, error);
2950 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002951 fail:
2952 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 +02002953 return 0;
2954}
2955
Willy Tarreau63864812019-08-07 14:25:20 +02002956/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2957 * valid for the current stream state. This is needed only after parsing the
2958 * frame header but in practice it can be performed at any time during
2959 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2960 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2961 */
2962static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2963{
Willy Tarreau7838a792019-08-12 18:42:03 +02002964 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2965
Willy Tarreau63864812019-08-07 14:25:20 +02002966 if (h2s->st == H2_SS_IDLE &&
2967 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2968 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2969 * this state MUST be treated as a connection error
2970 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002971 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 +02002972 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002973 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002974 /* only log if no other stream can report the error */
2975 sess_log(h2c->conn->owner);
2976 }
Willy Tarreaua3075282020-12-01 10:22:43 +01002977 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002978 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 +02002979 return 0;
2980 }
2981
Willy Tarreau57a18162019-11-24 14:57:53 +01002982 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2983 /* only PUSH_PROMISE would be permitted here */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002984 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 +01002985 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01002986 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau57a18162019-11-24 14:57:53 +01002987 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2988 return 0;
2989 }
2990
Willy Tarreau63864812019-08-07 14:25:20 +02002991 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2992 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2993 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2994 * this state MUST be treated as a stream error.
2995 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2996 * PUSH_PROMISE/CONTINUATION cause connection errors.
2997 */
Amaury Denoyellea8879232020-10-27 17:16:03 +01002998 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01002999 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 +02003000 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01003001 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003002 }
3003 else {
Willy Tarreau63864812019-08-07 14:25:20 +02003004 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003005 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003006 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 +02003007 return 0;
3008 }
3009
3010 /* Below the management of frames received in closed state is a
3011 * bit hackish because the spec makes strong differences between
3012 * streams closed by receiving RST, sending RST, and seeing ES
3013 * in both directions. In addition to this, the creation of a
3014 * new stream reusing the identifier of a closed one will be
3015 * detected here. Given that we cannot keep track of all closed
3016 * streams forever, we consider that unknown closed streams were
3017 * closed on RST received, which allows us to respond with an
3018 * RST without breaking the connection (eg: to abort a transfer).
3019 * Some frames have to be silently ignored as well.
3020 */
3021 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
3022 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
3023 /* #5.1.1: The identifier of a newly
3024 * established stream MUST be numerically
3025 * greater than all streams that the initiating
3026 * endpoint has opened or reserved. This
3027 * governs streams that are opened using a
3028 * HEADERS frame and streams that are reserved
3029 * using PUSH_PROMISE. An endpoint that
3030 * receives an unexpected stream identifier
3031 * MUST respond with a connection error.
3032 */
3033 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003034 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 +02003035 return 0;
3036 }
3037
Willy Tarreau4c08f122019-09-26 08:47:15 +02003038 if (h2s->flags & H2_SF_RST_RCVD &&
3039 !(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 +02003040 /* RFC7540#5.1:closed: an endpoint that
3041 * receives any frame other than PRIORITY after
3042 * receiving a RST_STREAM MUST treat that as a
3043 * stream error of type STREAM_CLOSED.
3044 *
3045 * Note that old streams fall into this category
3046 * and will lead to an RST being sent.
3047 *
3048 * However, we cannot generalize this to all frame types. Those
3049 * carrying compression state must still be processed before
3050 * being dropped or we'll desynchronize the decoder. This can
3051 * happen with request trailers received after sending an
3052 * RST_STREAM, or with header/trailers responses received after
3053 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02003054 *
3055 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003056 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02003057 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02003058 */
3059 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
3060 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02003061 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 +02003062 return 0;
3063 }
3064
3065 /* RFC7540#5.1:closed: if this state is reached as a
3066 * result of sending a RST_STREAM frame, the peer that
3067 * receives the RST_STREAM might have already sent
3068 * frames on the stream that cannot be withdrawn. An
3069 * endpoint MUST ignore frames that it receives on
3070 * closed streams after it has sent a RST_STREAM
3071 * frame. An endpoint MAY choose to limit the period
3072 * over which it ignores frames and treat frames that
3073 * arrive after this time as being in error.
3074 */
3075 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
3076 /* RFC7540#5.1:closed: any frame other than
3077 * PRIO/WU/RST in this state MUST be treated as
3078 * a connection error
3079 */
3080 if (h2c->dft != H2_FT_RST_STREAM &&
3081 h2c->dft != H2_FT_PRIORITY &&
3082 h2c->dft != H2_FT_WINDOW_UPDATE) {
3083 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003084 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 +02003085 return 0;
3086 }
3087 }
3088 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003089 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003090 return 1;
3091}
3092
Willy Tarreaubc933932017-10-09 16:21:43 +02003093/* process Rx frames to be demultiplexed */
3094static void h2_process_demux(struct h2c *h2c)
3095{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003096 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003097 struct h2_fh hdr;
3098 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003099 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02003100
Willy Tarreau7838a792019-08-12 18:42:03 +02003101 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3102
Willy Tarreau081d4722017-05-16 21:51:05 +02003103 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02003104 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02003105
3106 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3107 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003108 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02003109 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02003110 goto out;
3111
Willy Tarreau52eed752017-09-22 15:05:09 +02003112 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
3113 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003114 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003115 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003116 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02003117 sess_log(h2c->conn->owner);
3118 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003119 goto fail;
3120 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003121 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003122
3123 h2c->max_id = 0;
3124 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003125 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003126 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003127
3128 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003129 /* ensure that what is pending is a valid SETTINGS frame
3130 * without an ACK.
3131 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003132 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 +02003133 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003134 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003135 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003136 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 +02003137 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003138 if (!(h2c->flags & H2_CF_IS_BACK))
3139 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003140 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003141 goto fail;
3142 }
3143
3144 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
3145 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003146 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 +02003147 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3148 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003149 if (!(h2c->flags & H2_CF_IS_BACK))
3150 sess_log(h2c->conn->owner);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003151 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003152 goto fail;
3153 }
3154
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003155 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003156 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003157 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 +02003158 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3159 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003160 if (!(h2c->flags & H2_CF_IS_BACK))
3161 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003162 goto fail;
3163 }
3164
Willy Tarreau3bf69182018-12-21 15:34:50 +01003165 /* that's OK, switch to FRAME_P to process it. This is
3166 * a SETTINGS frame whose header has already been
3167 * deleted above.
3168 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01003169 padlen = 0;
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003170 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003171 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003172 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003173 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003174
3175 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02003176 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02003177 int ret = 0;
3178
Willy Tarreau7838a792019-08-12 18:42:03 +02003179 if (!b_data(&h2c->dbuf)) {
3180 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
3181 break;
3182 }
3183
3184 if (h2c->st0 >= H2_CS_ERROR) {
3185 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003186 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003187 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003188
3189 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02003190 h2c->rcvd_s = 0;
3191
Willy Tarreau7838a792019-08-12 18:42:03 +02003192 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01003193 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02003194 break;
3195
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003196 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003197 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 +02003198 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003199 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02003200 /* only log if no other stream can report the error */
3201 sess_log(h2c->conn->owner);
3202 }
Willy Tarreaua3075282020-12-01 10:22:43 +01003203 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003204 break;
3205 }
3206
Christopher Fauletdd2a5622019-06-18 12:22:38 +02003207 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003208 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
3209 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
3210 * we read the pad length and drop it from the remaining
3211 * payload (one byte + the 9 remaining ones = 10 total
3212 * removed), so we have a frame payload starting after the
3213 * pad len. Flow controlled frames (DATA) also count the
3214 * padlen in the flow control, so it must be adjusted.
3215 */
3216 if (hdr.len < 1) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003217 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 +01003218 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003219 if (!(h2c->flags & H2_CF_IS_BACK))
3220 sess_log(h2c->conn->owner);
Willy Tarreaua3075282020-12-01 10:22:43 +01003221 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003222 goto fail;
3223 }
3224 hdr.len--;
3225
3226 if (b_data(&h2c->dbuf) < 10)
3227 break; // missing padlen
3228
3229 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3230
3231 if (padlen > hdr.len) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003232 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 +01003233 /* RFC7540#6.1 : pad length = length of
3234 * frame payload or greater => error.
3235 */
3236 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003237 if (!(h2c->flags & H2_CF_IS_BACK))
3238 sess_log(h2c->conn->owner);
Willy Tarreaua3075282020-12-01 10:22:43 +01003239 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003240 goto fail;
3241 }
3242
3243 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3244 h2c->rcvd_c++;
3245 h2c->rcvd_s++;
3246 }
3247 b_del(&h2c->dbuf, 1);
3248 }
3249 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003250
3251 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003252 h2c->dfl = hdr.len;
3253 h2c->dsi = hdr.sid;
3254 h2c->dft = hdr.ft;
3255 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003256 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003257 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 +02003258 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003259
3260 /* check for minimum basic frame format validity */
3261 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3262 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003263 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 +01003264 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003265 if (!(h2c->flags & H2_CF_IS_BACK))
3266 sess_log(h2c->conn->owner);
Willy Tarreaua3075282020-12-01 10:22:43 +01003267 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003268 goto fail;
3269 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003270 }
3271
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003272 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3273 * H2_CS_FRAME_P indicates an incomplete previous operation
3274 * (most often the first attempt) and requires some validity
3275 * checks for the frame and the current state. The two other
3276 * ones are set after completion (or abortion) and must skip
3277 * validity checks.
3278 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003279 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3280
Willy Tarreau567beb82018-12-18 16:52:44 +01003281 if (tmp_h2s != h2s && h2s && h2s->cs &&
3282 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003283 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003284 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003285 (h2s->flags & H2_SF_ES_RCVD) ||
3286 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003287 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003288 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 +01003289 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003290 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003291 }
3292 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003293
Willy Tarreau63864812019-08-07 14:25:20 +02003294 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003295 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3296 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003297 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003298 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003299
Willy Tarreau7e98c052017-10-10 15:56:59 +02003300 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003301 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003302 if (h2c->st0 == H2_CS_FRAME_P) {
3303 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003304 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003305 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003306 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003307
Willy Tarreau7838a792019-08-12 18:42:03 +02003308 if (h2c->st0 == H2_CS_FRAME_A) {
3309 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 +02003310 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003311 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003312 break;
3313
Willy Tarreaucf68c782017-10-10 17:11:41 +02003314 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003315 if (h2c->st0 == H2_CS_FRAME_P) {
3316 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003317 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003318 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003319
Willy Tarreau7838a792019-08-12 18:42:03 +02003320 if (h2c->st0 == H2_CS_FRAME_A) {
3321 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 +02003322 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003323 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003324 break;
3325
Willy Tarreau26f95952017-07-27 17:18:30 +02003326 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003327 if (h2c->st0 == H2_CS_FRAME_P) {
3328 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 +02003329 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003330 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003331 break;
3332
Willy Tarreau61290ec2017-10-17 08:19:21 +02003333 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003334 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003335 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3336 * frames' parsers consume all following CONTINUATION
3337 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003338 */
Willy Tarreau5dd36ac2020-12-01 10:24:29 +01003339 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 +01003340 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003341 if (!(h2c->flags & H2_CF_IS_BACK))
3342 sess_log(h2c->conn->owner);
Willy Tarreaua3075282020-12-01 10:22:43 +01003343 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01003344 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003345
Willy Tarreau13278b42017-10-13 19:23:14 +02003346 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003347 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003348 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003349 if (h2c->flags & H2_CF_IS_BACK)
3350 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3351 else
3352 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003353 if (tmp_h2s) {
3354 h2s = tmp_h2s;
3355 ret = 1;
3356 }
3357 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003358 HA_ATOMIC_ADD(&h2c->px_counters->headers_rcvd, 1);
Willy Tarreau13278b42017-10-13 19:23:14 +02003359 break;
3360
Willy Tarreau454f9052017-10-26 19:40:35 +02003361 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003362 if (h2c->st0 == H2_CS_FRAME_P) {
3363 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Christopher Fauletfac0f8f2020-12-07 18:27:03 +01003364 ret = h2c_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003365 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003366 HA_ATOMIC_ADD(&h2c->px_counters->data_rcvd, 1);
Willy Tarreau454f9052017-10-26 19:40:35 +02003367
Willy Tarreau7838a792019-08-12 18:42:03 +02003368 if (h2c->st0 == H2_CS_FRAME_A) {
3369 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 +02003370 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003371 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003372 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003373
Willy Tarreau92153fc2017-12-03 19:46:19 +01003374 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003375 if (h2c->st0 == H2_CS_FRAME_P) {
3376 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003377 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003378 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003379 break;
3380
Willy Tarreaucd234e92017-08-18 10:59:39 +02003381 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003382 if (h2c->st0 == H2_CS_FRAME_P) {
3383 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 +02003384 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003385 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003386 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_rcvd, 1);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003387 break;
3388
Willy Tarreaue96b0922017-10-30 00:28:29 +01003389 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003390 if (h2c->st0 == H2_CS_FRAME_P) {
3391 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003392 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003393 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003394 HA_ATOMIC_ADD(&h2c->px_counters->goaway_rcvd, 1);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003395 break;
3396
Willy Tarreau1c661982017-10-30 13:52:01 +01003397 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003398 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003399 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003400 /* drop frames that we ignore. They may be larger than
3401 * the buffer so we drain all of their contents until
3402 * we reach the end.
3403 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003404 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3405 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003406 h2c->dfl -= ret;
3407 ret = h2c->dfl == 0;
3408 }
3409
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003410 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003411 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003412 if (h2s->st == H2_SS_ERROR) {
3413 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 +01003414 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003415 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003416
Willy Tarreau7838a792019-08-12 18:42:03 +02003417 if (h2c->st0 == H2_CS_FRAME_E) {
3418 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 +01003419 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003420 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003421
Willy Tarreau7e98c052017-10-10 15:56:59 +02003422 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003423 if (ret <= 0) {
3424 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003425 if (h2c->flags & H2_CF_RCVD_SHUT)
3426 h2c->flags |= H2_CF_END_REACHED;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003427 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003428 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003429
3430 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003431 if (h2c->dfl)
3432 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003433 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3434 b_del(&h2c->dbuf, ret);
3435 h2c->dfl -= ret;
3436 if (!h2c->dfl) {
3437 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3438 h2c->st0 = H2_CS_FRAME_H;
3439 h2c->dsi = -1;
3440 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003441 }
3442 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003443
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003444 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003445 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3446 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003447 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003448 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003449
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003450 done:
Willy Tarreau567beb82018-12-18 16:52:44 +01003451 if (h2s && h2s->cs &&
3452 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003453 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003454 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003455 (h2s->flags & H2_SF_ES_RCVD) ||
3456 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003457 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003458 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 +01003459 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003460 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003461 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003462
Willy Tarreau7838a792019-08-12 18:42:03 +02003463 if (old_iw != h2c->miw) {
3464 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003465 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003466 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003467
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003468 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003469 out:
3470 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003471 return;
3472
3473 fail:
3474 /* we can go here on missing data, blocked response or error, but we
3475 * need to check if we've met a short read condition.
3476 */
3477 if (h2c->flags & H2_CF_RCVD_SHUT)
3478 h2c->flags |= H2_CF_END_REACHED;
3479 goto done;
Willy Tarreaubc933932017-10-09 16:21:43 +02003480}
3481
Willy Tarreau989539b2020-01-10 17:01:29 +01003482/* resume each h2s eligible for sending in list head <head> */
3483static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3484{
3485 struct h2s *h2s, *h2s_back;
3486
3487 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3488
3489 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3490 if (h2c->mws <= 0 ||
3491 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3492 h2c->st0 >= H2_CS_ERROR)
3493 break;
3494
3495 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003496
Willy Tarreaud9464162020-01-10 18:25:07 +01003497 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003498 continue;
3499
Willy Tarreau5723f292020-01-10 15:16:57 +01003500 /* If the sender changed his mind and unsubscribed, let's just
3501 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003502 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003503 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3504 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003505 LIST_DEL_INIT(&h2s->list);
3506 continue;
3507 }
3508
Willy Tarreauf96508a2020-01-10 11:12:48 +01003509 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003510 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003511 tasklet_wakeup(h2s->subs->tasklet);
3512 h2s->subs->events &= ~SUB_RETRY_SEND;
3513 if (!h2s->subs->events)
3514 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003515 }
3516 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3517 tasklet_wakeup(h2s->shut_tl);
3518 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003519 }
3520
3521 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3522}
3523
Willy Tarreaubc933932017-10-09 16:21:43 +02003524/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3525 * the end.
3526 */
3527static int h2_process_mux(struct h2c *h2c)
3528{
Willy Tarreau7838a792019-08-12 18:42:03 +02003529 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3530
Willy Tarreau01b44822018-10-03 14:26:37 +02003531 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3532 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3533 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3534 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003535 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003536 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003537 goto fail;
3538 }
3539 h2c->st0 = H2_CS_SETTINGS1;
3540 }
3541 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003542 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003543 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003544 }
3545
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003546 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003547 if (h2c->rcvd_s > 0 &&
3548 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3549 h2c_send_strm_wu(h2c) < 0)
3550 goto fail;
3551
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003552 if (h2c->rcvd_c > 0 &&
3553 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3554 h2c_send_conn_wu(h2c) < 0)
3555 goto fail;
3556
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003557 /* First we always process the flow control list because the streams
3558 * waiting there were already elected for immediate emission but were
3559 * blocked just on this.
3560 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003561 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3562 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003563
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003564 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003565 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003566 if (h2c->st0 == H2_CS_ERROR) {
3567 if (h2c->max_id >= 0) {
3568 h2c_send_goaway_error(h2c, NULL);
3569 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003570 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003571 }
3572
3573 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3574 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003575 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003576 done:
3577 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3578 return 1;
3579 out0:
3580 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3581 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003582}
3583
Willy Tarreau62f52692017-10-08 23:01:42 +02003584
Willy Tarreau479998a2018-11-18 06:30:59 +01003585/* Attempt to read data, and subscribe if none available.
3586 * The function returns 1 if data has been received, otherwise zero.
3587 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003588static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003589{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003590 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003591 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003592 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003593 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003594
Willy Tarreau7838a792019-08-12 18:42:03 +02003595 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3596
3597 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3598 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003599 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003600 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003601
Willy Tarreau7838a792019-08-12 18:42:03 +02003602 if (!h2_recv_allowed(h2c)) {
3603 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003604 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003605 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003606
Willy Tarreau44e973f2018-03-01 17:49:30 +01003607 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003608 if (!buf) {
3609 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003610 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003611 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003612 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003613
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003614 if (h2c->flags & H2_CF_RCVD_SHUT) {
3615 TRACE_DEVEL("leaving on rcvd_shut", H2_EV_H2C_RECV, h2c->conn);
3616 return 0;
3617 }
3618
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003619 b_realign_if_empty(buf);
3620 if (!b_data(buf)) {
3621 /* try to pre-align the buffer like the
3622 * rxbufs will be to optimize memory copies. We'll make
3623 * sure that the frame header lands at the end of the
3624 * HTX block to alias it upon recv. We cannot use the
3625 * head because rcv_buf() will realign the buffer if
3626 * it's empty. Thus we cheat and pretend we already
3627 * have a few bytes there.
3628 */
3629 max = buf_room_for_htx_data(buf) + 9;
3630 buf->head = sizeof(struct htx) - 9;
3631 }
3632 else
3633 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003634
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003635 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003636
Willy Tarreauf0961222021-02-05 11:41:46 +01003637 if (max && !ret) {
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003638 if (conn_xprt_read0_pending(h2c->conn)) {
3639 TRACE_DATA("received read0", H2_EV_H2C_RECV, h2c->conn);
3640 h2c->flags |= H2_CF_RCVD_SHUT;
Willy Tarreauf0961222021-02-05 11:41:46 +01003641 } else if (h2_recv_allowed(h2c)) {
Willy Tarreau3d4631f2021-01-20 10:53:13 +01003642 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
3643 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
3644 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003645 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003646 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003647
Olivier Houcharda1411e62018-08-17 18:42:48 +02003648 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003649 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003650 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003651 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003652 }
3653
Willy Tarreau7838a792019-08-12 18:42:03 +02003654 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003655 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003656 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003657 }
3658
3659 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003660 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003661}
3662
Willy Tarreau479998a2018-11-18 06:30:59 +01003663/* Try to send data if possible.
3664 * The function returns 1 if data have been sent, otherwise zero.
3665 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003666static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003667{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003668 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003669 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003670 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003671
Willy Tarreau7838a792019-08-12 18:42:03 +02003672 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003673
Willy Tarreau7838a792019-08-12 18:42:03 +02003674 if (conn->flags & CO_FL_ERROR) {
3675 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3676 return 1;
3677 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003678
Willy Tarreau911db9b2020-01-23 16:27:54 +01003679 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003680 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003681 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003682 }
3683
Willy Tarreaubc933932017-10-09 16:21:43 +02003684 /* This loop is quite simple : it tries to fill as much as it can from
3685 * pending streams into the existing buffer until it's reportedly full
3686 * or the end of send requests is reached. Then it tries to send this
3687 * buffer's contents out, marks it not full if at least one byte could
3688 * be sent, and tries again.
3689 *
3690 * The snd_buf() function normally takes a "flags" argument which may
3691 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3692 * data immediately comes and CO_SFL_STREAMER to indicate that the
3693 * connection is streaming lots of data (used to increase TLS record
3694 * size at the expense of latency). The former can be sent any time
3695 * there's a buffer full flag, as it indicates at least one stream
3696 * attempted to send and failed so there are pending data. An
3697 * alternative would be to set it as long as there's an active stream
3698 * but that would be problematic for ACKs until we have an absolute
3699 * guarantee that all waiters have at least one byte to send. The
3700 * latter should possibly not be set for now.
3701 */
3702
3703 done = 0;
3704 while (!done) {
3705 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003706 unsigned int released = 0;
3707 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003708
3709 /* fill as much as we can into the current buffer */
3710 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3711 done = h2_process_mux(h2c);
3712
Olivier Houchard2b094432019-01-29 18:28:36 +01003713 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003714 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003715
Christopher Faulet9a3d3fc2020-10-22 16:24:58 +02003716 if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) ||
3717 (h2c->st0 == H2_CS_ERROR2) || (h2c->flags & H2_CF_GOAWAY_FAILED))
Willy Tarreaubc933932017-10-09 16:21:43 +02003718 break;
3719
3720 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3721 flags |= CO_SFL_MSG_MORE;
3722
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003723 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3724 if (b_data(buf)) {
3725 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003726 if (!ret) {
3727 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003728 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003729 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003730 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003731 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003732 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003733 if (b_data(buf)) {
3734 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003735 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003736 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003737 }
3738 b_free(buf);
3739 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003740 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003741
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003742 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003743 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003744
Willy Tarreaubc933932017-10-09 16:21:43 +02003745 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003746 if (sent)
3747 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003748 }
3749
Willy Tarreaua2af5122017-10-09 11:56:46 +02003750 if (conn->flags & CO_FL_SOCK_WR_SH) {
3751 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003752 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003753 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003754 /* We're not full anymore, so we can wake any task that are waiting
3755 * for us.
3756 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003757 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3758 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003759
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003760 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003761 if (!br_data(h2c->mbuf)) {
3762 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003763 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003764 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003765schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003766 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3767 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003768 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003769 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003770
Willy Tarreau7838a792019-08-12 18:42:03 +02003771 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003772 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003773}
3774
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003775/* this is the tasklet referenced in h2c->wait_event.tasklet */
Willy Tarreau691d5032021-01-20 14:55:01 +01003776struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003777{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003778 struct connection *conn;
3779 struct tasklet *tl = (struct tasklet *)t;
3780 int conn_in_list;
3781 struct h2c *h2c;
Olivier Houchard7505f942018-08-21 18:10:44 +02003782 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003783
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003784
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003785 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003786 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 */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003791 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003792 tasklet_free(tl);
Willy Tarreau38468772020-06-28 00:31:13 +02003793 goto leave;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003794 }
3795 h2c = ctx;
3796 conn = h2c->conn;
3797
3798 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3799
3800 conn_in_list = conn->flags & CO_FL_LIST_MASK;
3801
3802 /* Remove the connection from the list, to be sure nobody attempts
3803 * to use it while we handle the I/O events
3804 */
3805 if (conn_in_list)
3806 MT_LIST_DEL(&conn->list);
3807
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003808 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau7838a792019-08-12 18:42:03 +02003809
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003810 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003811 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003812 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003813 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003814 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003815 ret = h2_process(h2c);
3816
3817 /* If we were in an idle list, we want to add it back into it,
3818 * unless h2_process() returned -1, which mean it has destroyed
3819 * the connection (testing !ret is enough, if h2_process() wasn't
3820 * called then ret will be 0 anyway.
3821 */
3822 if (!ret && conn_in_list) {
3823 struct server *srv = objt_server(conn->target);
3824
3825 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003826 MT_LIST_ADDQ(&srv->safe_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003827 else
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003828 MT_LIST_ADDQ(&srv->idle_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003829 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003830
Willy Tarreau38468772020-06-28 00:31:13 +02003831leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003832 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003833 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003834}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003835
Willy Tarreau62f52692017-10-08 23:01:42 +02003836/* callback called on any event by the connection handler.
3837 * It applies changes and returns zero, or < 0 if it wants immediate
3838 * destruction of the connection (which normally doesn not happen in h2).
3839 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003840static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003841{
Olivier Houchard7505f942018-08-21 18:10:44 +02003842 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003843
Willy Tarreau7838a792019-08-12 18:42:03 +02003844 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3845
Willy Tarreauf0961222021-02-05 11:41:46 +01003846 if (!(h2c->flags & H2_CF_DEM_BLOCK_ANY) &&
3847 (b_data(&h2c->dbuf) || (h2c->flags & H2_CF_RCVD_SHUT))) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003848 h2_process_demux(h2c);
3849
3850 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003851 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003852
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003853 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003854 h2c->flags &= ~H2_CF_DEM_DFULL;
3855 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003856 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003857
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003858 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003859 /* frontend is stopping, reload likely in progress, let's try
3860 * to announce a graceful shutdown if not yet done. We don't
3861 * care if it fails, it will be tried again later.
3862 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003863 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003864 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3865 if (h2c->last_sid < 0)
3866 h2c->last_sid = (1U << 31) - 1;
3867 h2c_send_goaway_error(h2c, NULL);
3868 }
3869 }
3870
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003871 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003872 * If we received early data, and the handshake is done, wake
3873 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003874 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003875 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003876 (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 +01003877 struct eb32_node *node;
3878 struct h2s *h2s;
3879
3880 h2c->flags |= H2_CF_WAIT_FOR_HS;
3881 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3882
3883 while (node) {
3884 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003885 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003886 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003887 node = eb32_next(node);
3888 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003889 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003890
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003891 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003892 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3893 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3894 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003895 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003896
3897 if (eb_is_empty(&h2c->streams_by_id)) {
3898 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003899 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003900 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003901 return -1;
3902 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003903
3904 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003905 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003906 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003907 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003908 }
3909 else if (h2c->st0 == H2_CS_ERROR) {
3910 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003911 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003912 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003913 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003914 }
3915
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003916 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003917 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003918
Olivier Houchard53216e72018-10-10 15:46:36 +02003919 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3920 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3921 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003922 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003923 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3924 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003925 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003926
Willy Tarreau3f133572017-10-31 19:21:06 +01003927 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003928 if (h2c_may_expire(h2c))
3929 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3930 else
3931 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003932 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003933 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003934
Olivier Houchard7505f942018-08-21 18:10:44 +02003935 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003936 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003937 return 0;
3938}
3939
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003940/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003941static int h2_wake(struct connection *conn)
3942{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003943 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003944 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003945
Willy Tarreau7838a792019-08-12 18:42:03 +02003946 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3947 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003948 if (ret >= 0)
3949 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003950 TRACE_LEAVE(H2_EV_H2C_WAKE);
3951 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003952}
3953
Willy Tarreauea392822017-10-31 10:02:25 +01003954/* Connection timeout management. The principle is that if there's no receipt
3955 * nor sending for a certain amount of time, the connection is closed. If the
3956 * MUX buffer still has lying data or is not allocatable, the connection is
3957 * immediately killed. If it's allocatable and empty, we attempt to send a
3958 * GOAWAY frame.
3959 */
Willy Tarreauac6322d2021-01-29 12:33:46 +01003960struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003961{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003962 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003963 int expired = tick_is_expired(t->expire, now_ms);
3964
Willy Tarreau7838a792019-08-12 18:42:03 +02003965 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3966
Willy Tarreaubd42e922020-06-30 11:19:23 +02003967 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003968 /* Make sure nobody stole the connection from us */
3969 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3970
3971 /* Somebody already stole the connection from us, so we should not
3972 * free it, we just have to free the task.
3973 */
3974 if (!t->context) {
3975 h2c = NULL;
Willy Tarreau46ac7812020-07-04 07:16:18 +02003976 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003977 goto do_leave;
3978 }
3979
3980
Willy Tarreaubd42e922020-06-30 11:19:23 +02003981 if (!expired) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003982 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003983 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3984 return t;
3985 }
Willy Tarreauea392822017-10-31 10:02:25 +01003986
Willy Tarreaubd42e922020-06-30 11:19:23 +02003987 if (!h2c_may_expire(h2c)) {
3988 /* we do still have streams but all of them are idle, waiting
3989 * for the data layer, so we must not enforce the timeout here.
3990 */
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003991 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003992 t->expire = TICK_ETERNITY;
3993 return t;
3994 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003995
Willy Tarreaubd42e922020-06-30 11:19:23 +02003996 /* We're about to destroy the connection, so make sure nobody attempts
3997 * to steal it from us.
3998 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02003999 if (h2c->conn->flags & CO_FL_LIST_MASK)
4000 MT_LIST_DEL(&h2c->conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004001
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02004002 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02004003 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01004004
Olivier Houchard48ce6a32020-07-02 11:58:05 +02004005do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02004006 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02004007
4008 if (!h2c) {
4009 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02004010 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02004011 return NULL;
4012 }
4013
4014 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01004015 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02004016 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01004017
Willy Tarreau662fafc2019-05-26 09:43:07 +02004018 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01004019 /* don't even try to send a GOAWAY, the buffer is stuck */
4020 h2c->flags |= H2_CF_GOAWAY_FAILED;
4021 }
4022
4023 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01004024 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01004025 if (h2c_send_goaway_error(h2c, NULL) <= 0)
4026 h2c->flags |= H2_CF_GOAWAY_FAILED;
4027
Willy Tarreau662fafc2019-05-26 09:43:07 +02004028 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004029 unsigned int released = 0;
4030 struct buffer *buf;
4031
4032 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
4033 if (b_data(buf)) {
4034 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
4035 if (!ret)
4036 break;
4037 b_del(buf, ret);
4038 if (b_data(buf))
4039 break;
4040 b_free(buf);
4041 released++;
4042 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02004043 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02004044
4045 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02004046 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02004047 }
Willy Tarreauea392822017-10-31 10:02:25 +01004048
Willy Tarreau4481e262019-10-31 15:36:30 +01004049 /* in any case this connection must not be considered idle anymore */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02004050 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01004051 MT_LIST_DEL((struct mt_list *)&h2c->conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02004052 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01004053
Willy Tarreau0975f112018-03-29 15:22:59 +02004054 /* either we can release everything now or it will be done later once
4055 * the last stream closes.
4056 */
4057 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02004058 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01004059
Willy Tarreau7838a792019-08-12 18:42:03 +02004060 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01004061 return NULL;
4062}
4063
4064
Willy Tarreau62f52692017-10-08 23:01:42 +02004065/*******************************************/
4066/* functions below are used by the streams */
4067/*******************************************/
4068
4069/*
4070 * Attach a new stream to a connection
4071 * (Used for outgoing connections)
4072 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01004073static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02004074{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004075 struct conn_stream *cs;
4076 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004077 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004078
Willy Tarreau7838a792019-08-12 18:42:03 +02004079 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02004080 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02004081 if (!cs) {
4082 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004083 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004084 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01004085 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004086 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004087 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004088 cs_free(cs);
4089 return NULL;
4090 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004091 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004092 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02004093}
4094
Willy Tarreaufafd3982018-11-18 21:29:20 +01004095/* Retrieves the first valid conn_stream from this connection, or returns NULL.
4096 * We have to scan because we may have some orphan streams. It might be
4097 * beneficial to scan backwards from the end to reduce the likeliness to find
4098 * orphans.
4099 */
4100static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
4101{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004102 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01004103 struct h2s *h2s;
4104 struct eb32_node *node;
4105
4106 node = eb32_first(&h2c->streams_by_id);
4107 while (node) {
4108 h2s = container_of(node, struct h2s, by_id);
4109 if (h2s->cs)
4110 return h2s->cs;
4111 node = eb32_next(node);
4112 }
4113 return NULL;
4114}
4115
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004116static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
4117{
4118 int ret = 0;
4119 struct h2c *h2c = conn->ctx;
4120
4121 switch (mux_ctl) {
4122 case MUX_STATUS:
4123 /* Only consider the mux to be ready if we're done with
4124 * the preface and settings, and we had no error.
4125 */
4126 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
4127 ret |= MUX_STATUS_READY;
4128 return ret;
Christopher Faulet4c8ad842020-10-06 14:59:17 +02004129 case MUX_EXIT_STATUS:
4130 return MUX_ES_UNKNOWN;
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004131 default:
4132 return -1;
4133 }
4134}
4135
Willy Tarreau62f52692017-10-08 23:01:42 +02004136/*
Olivier Houchard060ed432018-11-06 16:32:42 +01004137 * Destroy the mux and the associated connection, if it is no longer used
4138 */
Christopher Faulet73c12072019-04-08 11:23:22 +02004139static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01004140{
Christopher Faulet73c12072019-04-08 11:23:22 +02004141 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01004142
Willy Tarreau7838a792019-08-12 18:42:03 +02004143 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02004144 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02004145 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004146 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01004147}
4148
4149/*
Willy Tarreau62f52692017-10-08 23:01:42 +02004150 * Detach the stream from the connection and possibly release the connection.
4151 */
4152static void h2_detach(struct conn_stream *cs)
4153{
Willy Tarreau60935142017-10-16 18:11:19 +02004154 struct h2s *h2s = cs->ctx;
4155 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01004156 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004157
Willy Tarreau7838a792019-08-12 18:42:03 +02004158 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
4159
Willy Tarreau60935142017-10-16 18:11:19 +02004160 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004161 if (!h2s) {
4162 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02004163 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004164 }
Willy Tarreau60935142017-10-16 18:11:19 +02004165
Willy Tarreaud9464162020-01-10 18:25:07 +01004166 /* there's no txbuf so we're certain not to be able to send anything */
4167 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02004168
Olivier Houchardf502aca2018-12-14 19:42:40 +01004169 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004170 h2c = h2s->h2c;
4171 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02004172 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01004173 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
4174 !h2_frt_has_too_many_cs(h2c)) {
4175 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02004176 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004177 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02004178 }
Willy Tarreau60935142017-10-16 18:11:19 +02004179
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004180 /* this stream may be blocked waiting for some data to leave (possibly
4181 * an ES or RST frame), so orphan it in this case.
4182 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02004183 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02004184 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01004185 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01004186 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004187 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004188 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004189 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004190
Willy Tarreau45f752e2017-10-30 15:44:59 +01004191 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
4192 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
4193 /* unblock the connection if it was blocked on this
4194 * stream.
4195 */
4196 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
4197 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004198 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01004199 }
4200
Willy Tarreau71049cc2018-03-28 13:56:39 +02004201 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02004202
Christopher Faulet9b79a102019-07-15 11:22:56 +02004203 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01004204 if (!(h2c->conn->flags &
4205 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004206 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02004207 /* Add the connection in the session server list, if not already done */
4208 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
4209 h2c->conn->owner = NULL;
4210 if (eb_is_empty(&h2c->streams_by_id)) {
4211 h2c->conn->mux->destroy(h2c);
4212 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4213 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02004214 }
4215 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02004216 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004217 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
4218 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
4219 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01004220 return;
4221 }
4222 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004223 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004224 else {
4225 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004226 /* If the connection is owned by the session, first remove it
4227 * from its list
4228 */
4229 if (h2c->conn->owner) {
4230 session_unown_conn(h2c->conn->owner, h2c->conn);
4231 h2c->conn->owner = NULL;
4232 }
4233
Olivier Houcharddc2f2752020-02-13 19:12:07 +01004234 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01004235 /* The server doesn't want it, let's kill the connection right away */
4236 h2c->conn->mux->destroy(h2c);
4237 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4238 return;
4239 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01004240 /* At this point, the connection has been added to the
4241 * server idle list, so another thread may already have
4242 * hijacked it, so we can't do anything with it.
4243 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01004244 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
4245 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01004246
Olivier Houchard8a786902018-12-15 16:05:40 +01004247 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004248 else if (MT_LIST_ISEMPTY(&h2c->conn->list) &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004249 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
4250 !LIST_ADDED(&h2c->conn->session_list)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004251 LIST_ADD(&__objt_server(h2c->conn->target)->available_conns[tid], mt_list_to_list(&h2c->conn->list));
4252 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004253 }
4254 }
4255 }
4256
Willy Tarreaue323f342018-03-28 13:51:45 +02004257 /* We don't want to close right now unless we're removing the
4258 * last stream, and either the connection is in error, or it
4259 * reached the ID already specified in a GOAWAY frame received
4260 * or sent (as seen by last_sid >= 0).
4261 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004262 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004263 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004264 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004265 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004266 }
4267 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004268 if (h2c_may_expire(h2c))
4269 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4270 else
4271 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004272 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004273 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004274 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004275 else
4276 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004277}
4278
Willy Tarreau88bdba32019-05-13 18:17:53 +02004279/* Performs a synchronous or asynchronous shutr(). */
4280static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004281{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004282 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004283
Willy Tarreauf983d002019-05-14 10:40:21 +02004284 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004285 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004286
Willy Tarreau7838a792019-08-12 18:42:03 +02004287 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4288
Willy Tarreau18059042019-01-31 19:12:48 +01004289 /* a connstream may require us to immediately kill the whole connection
4290 * for example because of a "tcp-request content reject" rule that is
4291 * normally used to limit abuse. In this case we schedule a goaway to
4292 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004293 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004294 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004295 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004296 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004297 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4298 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4299 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004300 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4301 /* Nothing was never sent for this stream, so reset with
4302 * REFUSED_STREAM error to let the client retry the
4303 * request.
4304 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004305 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004306 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4307 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004308 else {
4309 /* a final response was already provided, we don't want this
4310 * stream anymore. This may happen when the server responds
4311 * before the end of an upload and closes quickly (redirect,
4312 * deny, ...)
4313 */
4314 h2s_error(h2s, H2_ERR_CANCEL);
4315 }
Willy Tarreau18059042019-01-31 19:12:48 +01004316
Willy Tarreau90c32322017-11-24 08:00:30 +01004317 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004318 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004319 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004320
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004321 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004322 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004323 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004324 done:
4325 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004326 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004327 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004328add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004329 /* Let the handler know we want to shutr, and add ourselves to the
4330 * most relevant list if not yet done. h2_deferred_shut() will be
4331 * automatically called via the shut_tl tasklet when there's room
4332 * again.
4333 */
4334 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004335 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004336 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004337 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004338 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004339 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004340 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004341 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004342 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004343}
4344
Willy Tarreau88bdba32019-05-13 18:17:53 +02004345/* Performs a synchronous or asynchronous shutw(). */
4346static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004347{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004348 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004349
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004350 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004351 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004352
Willy Tarreau7838a792019-08-12 18:42:03 +02004353 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4354
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004355 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004356 /* we can cleanly close using an empty data frame only after headers */
4357
4358 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4359 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004360 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004361
4362 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004363 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004364 else
4365 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004366 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004367 /* a connstream may require us to immediately kill the whole connection
4368 * for example because of a "tcp-request content reject" rule that is
4369 * normally used to limit abuse. In this case we schedule a goaway to
4370 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004371 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004372 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004373 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004374 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004375 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4376 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4377 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004378 else {
4379 /* Nothing was never sent for this stream, so reset with
4380 * REFUSED_STREAM error to let the client retry the
4381 * request.
4382 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004383 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004384 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4385 }
Willy Tarreau18059042019-01-31 19:12:48 +01004386
Willy Tarreau90c32322017-11-24 08:00:30 +01004387 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004388 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004389 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004390
Willy Tarreau00dd0782018-03-01 16:31:34 +01004391 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004392 }
4393
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004394 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004395 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004396
4397 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4398
Willy Tarreau88bdba32019-05-13 18:17:53 +02004399 done:
4400 h2s->flags &= ~H2_SF_WANT_SHUTW;
4401 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004402
4403 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004404 /* Let the handler know we want to shutw, and add ourselves to the
4405 * most relevant list if not yet done. h2_deferred_shut() will be
4406 * automatically called via the shut_tl tasklet when there's room
4407 * again.
4408 */
4409 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004410 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004411 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004412 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004413 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004414 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004415 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004416 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004417 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004418}
4419
Willy Tarreau5723f292020-01-10 15:16:57 +01004420/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004421 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4422 * and prevented the last frame from being emitted.
4423 */
Willy Tarreauac6322d2021-01-29 12:33:46 +01004424struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004425{
4426 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004427 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004428
Willy Tarreau7838a792019-08-12 18:42:03 +02004429 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4430
Willy Tarreau5723f292020-01-10 15:16:57 +01004431 if (h2s->flags & H2_SF_NOTIFIED) {
4432 /* some data processing remains to be done first */
4433 goto end;
4434 }
4435
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004436 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004437 h2_do_shutw(h2s);
4438
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004439 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004440 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004441
Willy Tarreau88bdba32019-05-13 18:17:53 +02004442 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004443 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004444 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004445
Willy Tarreau88bdba32019-05-13 18:17:53 +02004446 if (!h2s->cs) {
4447 h2s_destroy(h2s);
4448 if (h2c_is_dead(h2c))
4449 h2_release(h2c);
4450 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004451 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004452 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004453 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004454 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004455}
4456
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004457/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004458static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4459{
4460 struct h2s *h2s = cs->ctx;
4461
Willy Tarreau7838a792019-08-12 18:42:03 +02004462 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004463 if (cs->flags & CS_FL_KILL_CONN)
4464 h2s->flags |= H2_SF_KILL_CONN;
4465
Willy Tarreau7838a792019-08-12 18:42:03 +02004466 if (mode)
4467 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004468
Willy Tarreau7838a792019-08-12 18:42:03 +02004469 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004470}
4471
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004472/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004473static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4474{
4475 struct h2s *h2s = cs->ctx;
4476
Willy Tarreau7838a792019-08-12 18:42:03 +02004477 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004478 if (cs->flags & CS_FL_KILL_CONN)
4479 h2s->flags |= H2_SF_KILL_CONN;
4480
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004481 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004482 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004483}
4484
Christopher Faulet9b79a102019-07-15 11:22:56 +02004485/* Decode the payload of a HEADERS frame and produce the HTX request or response
4486 * depending on the connection's side. Returns a positive value on success, a
4487 * negative value on failure, or 0 if it couldn't proceed. May report connection
4488 * errors in h2c->errcode if the frame is non-decodable and the connection
4489 * unrecoverable. In absence of connection error when a failure is reported, the
4490 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004491 *
4492 * The function may fold CONTINUATION frames into the initial HEADERS frame
4493 * by removing padding and next frame header, then moving the CONTINUATION
4494 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4495 * leaving a hole between the main frame and the beginning of the next one.
4496 * The possibly remaining incomplete or next frame at the end may be moved
4497 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4498 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4499 *
4500 * A buffer at the beginning of processing may look like this :
4501 *
4502 * ,---.---------.-----.--------------.--------------.------.---.
4503 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4504 * `---^---------^-----^--------------^--------------^------^---'
4505 * | | <-----> | |
4506 * area | dpl | wrap
4507 * |<--------------> |
4508 * | dfl |
4509 * |<-------------------------------------------------->|
4510 * head data
4511 *
4512 * Padding is automatically overwritten when folding, participating to the
4513 * hole size after dfl :
4514 *
4515 * ,---.------------------------.-----.--------------.------.---.
4516 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4517 * `---^------------------------^-----^--------------^------^---'
4518 * | | <-----> | |
4519 * area | hole | wrap
4520 * |<-----------------------> |
4521 * | dfl |
4522 * |<-------------------------------------------------->|
4523 * head data
4524 *
4525 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4526 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4527 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004528 *
4529 * The <flags> field must point to either the stream's flags or to a copy of it
4530 * so that the function can update the following flags :
4531 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004532 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004533 *
4534 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4535 * decoding, in order to detect if we're dealing with a headers or a trailers
4536 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004537 */
Amaury Denoyelle74162742020-12-11 17:53:05 +01004538static 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 +02004539{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004540 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004541 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004542 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004543 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004544 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004545 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004546 int flen; // header frame len
4547 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004548 int ret = 0;
4549 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004550 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004551
Willy Tarreau7838a792019-08-12 18:42:03 +02004552 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4553
Willy Tarreauea18f862018-12-22 20:19:26 +01004554next_frame:
4555 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4556 goto leave; // incomplete input frame
4557
4558 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4559 * this case, we'll try to paste it immediately after the initial
4560 * HEADERS frame payload and kill any possible padding. The initial
4561 * frame's length will be increased to represent the concatenation
4562 * of the two frames. The next frame is read from position <tlen>
4563 * and written at position <flen> (minus padding if some is present).
4564 */
4565 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4566 struct h2_fh hdr;
4567 int clen; // CONTINUATION frame's payload length
4568
Willy Tarreau7838a792019-08-12 18:42:03 +02004569 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 +01004570 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4571 /* no more data, the buffer may be full, either due to
4572 * too large a frame or because of too large a hole that
4573 * we're going to compact at the end.
4574 */
4575 goto leave;
4576 }
4577
4578 if (hdr.ft != H2_FT_CONTINUATION) {
4579 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004580 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 +01004581 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01004582 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004583 goto fail;
4584 }
4585
4586 if (hdr.sid != h2c->dsi) {
4587 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004588 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 +01004589 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01004590 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004591 goto fail;
4592 }
4593
4594 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4595 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004596 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 +01004597 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4598 goto fail;
4599 }
4600
4601 /* detect when we must stop aggragating frames */
4602 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4603
4604 /* Take as much as we can of the CONTINUATION frame's payload */
4605 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4606 if (clen > hdr.len)
4607 clen = hdr.len;
4608
4609 /* Move the frame's payload over the padding, hole and frame
4610 * header. At least one of hole or dpl is null (see diagrams
4611 * above). The hole moves after the new aggragated frame.
4612 */
4613 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4614 h2c->dfl += clen - h2c->dpl;
4615 hole += h2c->dpl + 9;
4616 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004617 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 +01004618 goto next_frame;
4619 }
4620
4621 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004622
Willy Tarreau13278b42017-10-13 19:23:14 +02004623 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004624 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004625 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004626 copy = alloc_trash_chunk();
4627 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004628 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 +02004629 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4630 goto fail;
4631 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004632 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4633 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4634 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004635 }
4636
Willy Tarreau13278b42017-10-13 19:23:14 +02004637 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4638 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004639 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004640 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004641 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 +01004642 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01004643 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004644 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004645 }
4646
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004647 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004648 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 +01004649 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4650 goto fail;
4651 }
4652
Willy Tarreau13278b42017-10-13 19:23:14 +02004653 hdrs += 5; // stream dep = 4, weight = 1
4654 flen -= 5;
4655 }
4656
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004657 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004658 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 +01004659 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004660 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004661 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004662
Willy Tarreau937f7602018-02-26 15:22:17 +01004663 /* we can't retry a failed decompression operation so we must be very
4664 * careful not to take any risks. In practice the output buffer is
4665 * always empty except maybe for trailers, in which case we simply have
4666 * to wait for the upper layer to finish consuming what is available.
4667 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004668 htx = htx_from_buf(rxbuf);
4669 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004670 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 +02004671 h2c->flags |= H2_CF_DEM_SFULL;
4672 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004673 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004674
Willy Tarreau25919232019-01-03 14:48:18 +01004675 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004676 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4677 sizeof(list)/sizeof(list[0]), tmp);
4678 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004679 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 +01004680 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4681 goto fail;
4682 }
4683
Willy Tarreau25919232019-01-03 14:48:18 +01004684 /* The PACK decompressor was updated, let's update the input buffer and
4685 * the parser's state to commit these changes and allow us to later
4686 * fail solely on the stream if needed.
4687 */
4688 b_del(&h2c->dbuf, h2c->dfl + hole);
4689 h2c->dfl = hole = 0;
4690 h2c->st0 = H2_CS_FRAME_H;
4691
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004692 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004693 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Christopher Fauletd0db4232021-01-22 11:46:30 +01004694 msgf |= (*flags & H2_SF_BODY_TUNNEL) ? H2_MSGF_BODY_TUNNEL: 0;
Amaury Denoyelle74162742020-12-11 17:53:05 +01004695 /* If an Extended CONNECT has been sent on this stream, set message flag
4696 * to convert 200 response to 101 htx reponse */
4697 msgf |= (*flags & H2_SF_EXT_CONNECT_SENT) ? H2_MSGF_EXT_CONNECT: 0;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004698
Willy Tarreau88d138e2019-01-02 19:38:14 +01004699 if (*flags & H2_SF_HEADERS_RCVD)
4700 goto trailers;
4701
4702 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004703 if (h2c->flags & H2_CF_IS_BACK)
Amaury Denoyelle74162742020-12-11 17:53:05 +01004704 outlen = h2_make_htx_response(list, htx, &msgf, body_len, upgrade_protocol);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004705 else
4706 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004707
4708 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004709 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004710 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 +01004711 goto fail;
4712 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004713
Willy Tarreau174b06a2018-04-25 18:13:58 +02004714 if (msgf & H2_MSGF_BODY) {
4715 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004716 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004717 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004718 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004719 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004720 }
Christopher Faulet7d247f02020-12-02 14:26:36 +01004721 if (msgf & H2_MSGF_BODYLESS_RSP)
4722 *flags |= H2_SF_BODYLESS_RESP;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004723
Christopher Fauletd0db4232021-01-22 11:46:30 +01004724 if (msgf & H2_MSGF_BODY_TUNNEL)
4725 *flags |= H2_SF_BODY_TUNNEL;
4726 else {
4727 /* Abort the tunnel attempt, if any */
4728 if (*flags & H2_SF_BODY_TUNNEL)
4729 *flags |= H2_SF_TUNNEL_ABRT;
4730 *flags &= ~H2_SF_BODY_TUNNEL;
4731 }
4732
Willy Tarreau88d138e2019-01-02 19:38:14 +01004733 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004734 /* indicate that a HEADERS frame was received for this stream, except
4735 * for 1xx responses. For 1xx responses, another HEADERS frame is
4736 * expected.
4737 */
4738 if (!(msgf & H2_MSGF_RSP_1XX))
4739 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004740
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004741 if (h2c->dff & H2_F_HEADERS_END_STREAM) {
4742 /* no more data are expected for this message */
4743 htx->flags |= HTX_FL_EOM;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004744 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004745
Amaury Denoyelleefe22762020-12-11 17:53:08 +01004746 if (msgf & H2_MSGF_EXT_CONNECT)
4747 *flags |= H2_SF_EXT_CONNECT_RCVD;
4748
Willy Tarreau86277d42019-01-02 15:36:11 +01004749 /* success */
4750 ret = 1;
4751
Willy Tarreau68dd9852017-07-03 14:44:26 +02004752 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004753 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004754 * move the remaining data over it.
4755 */
4756 if (hole) {
4757 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4758 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4759 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4760 b_sub(&h2c->dbuf, hole);
4761 }
4762
Willy Tarreau97215ca2019-04-29 10:20:21 +02004763 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004764 /* too large frames */
4765 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004766 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004767 }
4768
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004769 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004770 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004771 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004772 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004773 return ret;
4774
Willy Tarreau68dd9852017-07-03 14:44:26 +02004775 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004776 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004777 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004778
4779 trailers:
4780 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004781 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4782 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004783 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 +01004784 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua3075282020-12-01 10:22:43 +01004785 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004786 goto fail;
4787 }
4788
Christopher Faulet9b79a102019-07-15 11:22:56 +02004789 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004790 if (h2_make_htx_trailers(list, htx) <= 0) {
4791 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 +02004792 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004793 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004794 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004795}
4796
Christopher Faulet9b79a102019-07-15 11:22:56 +02004797/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004798 * parser state is automatically updated. Returns > 0 if it could completely
4799 * send the current frame, 0 if it couldn't complete, in which case
4800 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4801 * DATA frame can return 0 as a valid result). Stream errors are reported in
4802 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4803 * have checked the frame header and ensured that the frame was complete or the
4804 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004805 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004806static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004807{
4808 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004809 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004810 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004811 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004812 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004813 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004814
Willy Tarreau7838a792019-08-12 18:42:03 +02004815 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4816
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004817 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004818
Olivier Houchard638b7992018-08-16 15:41:52 +02004819 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004820 if (!csbuf) {
4821 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004822 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 +01004823 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004824 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004825 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004826
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004827try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004828 flen = h2c->dfl - h2c->dpl;
4829 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004830 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004831
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004832 if (flen > b_data(&h2c->dbuf)) {
4833 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004834 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004835 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004836 }
4837
Christopher Faulet9b79a102019-07-15 11:22:56 +02004838 block = htx_free_data_space(htx);
4839 if (!block) {
4840 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004841 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 +02004842 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004843 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004844 if (flen > block)
4845 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004846
Christopher Faulet9b79a102019-07-15 11:22:56 +02004847 /* here, flen is the max we can copy into the output buffer */
4848 block = b_contig_data(&h2c->dbuf, 0);
4849 if (flen > block)
4850 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004851
Christopher Faulet9b79a102019-07-15 11:22:56 +02004852 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004853 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 +02004854
Christopher Faulet9b79a102019-07-15 11:22:56 +02004855 b_del(&h2c->dbuf, sent);
4856 h2c->dfl -= sent;
4857 h2c->rcvd_c += sent;
4858 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004859
Christopher Faulet9b79a102019-07-15 11:22:56 +02004860 if (h2s->flags & H2_SF_DATA_CLEN) {
4861 h2s->body_len -= sent;
4862 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004863 }
4864
Christopher Faulet9b79a102019-07-15 11:22:56 +02004865 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004866 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004867 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 +01004868 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004869 }
4870
Christopher Faulet9b79a102019-07-15 11:22:56 +02004871 goto try_again;
4872
Willy Tarreau4a28da12018-01-04 14:41:00 +01004873 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004874 /* here we're done with the frame, all the payload (except padding) was
4875 * transferred.
4876 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004877
Christopher Faulet5be651d2021-01-22 15:28:03 +01004878 if (!(h2s->flags & H2_SF_BODY_TUNNEL) && (h2c->dff & H2_F_DATA_END_STREAM)) {
4879 /* no more data are expected for this message. This add the EOM
4880 * flag but only on the response path or if no tunnel attempt
4881 * was aborted. Otherwise (request path + tunnel abrted), the
4882 * EOM was already reported.
4883 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004884 if ((h2c->flags & H2_CF_IS_BACK) || !(h2s->flags & H2_SF_TUNNEL_ABRT))
4885 htx->flags |= HTX_FL_EOM;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004886 }
4887
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004888 h2c->rcvd_c += h2c->dpl;
4889 h2c->rcvd_s += h2c->dpl;
4890 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004891 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004892 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004893 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004894 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004895 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004896 if (htx)
4897 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004898 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004899 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004900}
4901
Willy Tarreau115e83b2018-12-01 19:17:53 +01004902/* Try to send a HEADERS frame matching HTX response present in HTX message
4903 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4904 * must check the stream's status to detect any error which might have happened
4905 * subsequently to a successful send. The htx blocks are automatically removed
4906 * from the message. The htx message is assumed to be valid since produced from
4907 * the internal code, hence it contains a start line, an optional series of
4908 * header blocks and an end of header, otherwise an invalid frame could be
4909 * emitted and the resulting htx message could be left in an inconsistent state.
4910 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004911static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004912{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004913 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004914 struct h2c *h2c = h2s->h2c;
4915 struct htx_blk *blk;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004916 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004917 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004918 struct htx_sl *sl;
4919 enum htx_blk_type type;
4920 int es_now = 0;
4921 int ret = 0;
4922 int hdr;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004923
Willy Tarreau7838a792019-08-12 18:42:03 +02004924 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4925
Willy Tarreau115e83b2018-12-01 19:17:53 +01004926 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004927 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004928 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004929 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004930 return 0;
4931 }
4932
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004933 /* get the start line (we do have one) and the rest of the headers,
4934 * that we dump starting at header 0 */
4935 sl = NULL;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004936 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004937 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau115e83b2018-12-01 19:17:53 +01004938 type = htx_get_blk_type(blk);
4939
4940 if (type == HTX_BLK_UNUSED)
4941 continue;
4942
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004943 if (type == HTX_BLK_EOH)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004944 break;
4945
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004946 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01004947 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004948 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4949 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4950 goto fail;
4951 }
4952
4953 list[hdr].n = htx_get_blk_name(htx, blk);
4954 list[hdr].v = htx_get_blk_value(htx, blk);
4955 hdr++;
4956 }
4957 else if (type == HTX_BLK_RES_SL) {
Christopher Faulet56498132021-01-29 11:39:43 +01004958 BUG_ON(sl); /* Only one start-line expected */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004959 sl = htx_get_blk_ptr(htx, blk);
4960 h2s->status = sl->info.res.status;
Christopher Faulet7d247f02020-12-02 14:26:36 +01004961 if (h2s->status == 204 || h2s->status == 304)
4962 h2s->flags |= H2_SF_BODYLESS_RESP;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004963 if (h2s->status < 100 || h2s->status > 999) {
4964 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4965 goto fail;
4966 }
4967 else if (h2s->status == 101) {
Amaury Denoyelleefe22762020-12-11 17:53:08 +01004968 if (unlikely(h2s->flags & H2_SF_EXT_CONNECT_RCVD)) {
4969 /* If an Extended CONNECT has been received, we need to convert 101 to 200 */
4970 h2s->status = 200;
4971 h2s->flags &= ~H2_SF_EXT_CONNECT_RCVD;
4972 }
4973 else {
4974 /* Otherwise, 101 responses are not supported in H2, so return a error (RFC7540#8.1.1) */
4975 TRACE_ERROR("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4976 goto fail;
4977 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01004978 }
4979 else if ((h2s->flags & H2_SF_BODY_TUNNEL) && h2s->status >= 300) {
4980 /* Abort the tunnel attempt */
4981 h2s->flags &= ~H2_SF_BODY_TUNNEL;
4982 h2s->flags |= H2_SF_TUNNEL_ABRT;
4983 }
4984 }
4985 else {
4986 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 +01004987 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004988 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004989 }
4990
Christopher Faulet56498132021-01-29 11:39:43 +01004991 /* The start-line me be defined */
4992 BUG_ON(!sl);
4993
Willy Tarreau115e83b2018-12-01 19:17:53 +01004994 /* marker for end of headers */
4995 list[hdr].n = ist("");
4996
Willy Tarreau9c218e72019-05-26 10:08:28 +02004997 mbuf = br_tail(h2c->mbuf);
4998 retry:
4999 if (!h2_get_buf(h2c, mbuf)) {
5000 h2c->flags |= H2_CF_MUX_MALLOC;
5001 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005002 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 +02005003 return 0;
5004 }
5005
Willy Tarreau115e83b2018-12-01 19:17:53 +01005006 chunk_reset(&outbuf);
5007
5008 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005009 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5010 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005011 break;
5012 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005013 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01005014 }
5015
5016 if (outbuf.size < 9)
5017 goto full;
5018
5019 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5020 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5021 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5022 outbuf.data = 9;
5023
5024 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01005025 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005026 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005027 goto realign_again;
5028 goto full;
5029 }
5030
5031 /* encode all headers, stop at empty name */
5032 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
5033 /* these ones do not exist in H2 and must be dropped. */
5034 if (isteq(list[hdr].n, ist("connection")) ||
5035 isteq(list[hdr].n, ist("proxy-connection")) ||
5036 isteq(list[hdr].n, ist("keep-alive")) ||
5037 isteq(list[hdr].n, ist("upgrade")) ||
5038 isteq(list[hdr].n, ist("transfer-encoding")))
5039 continue;
5040
Christopher Faulet86d144c2019-08-14 16:32:25 +02005041 /* Skip all pseudo-headers */
5042 if (*(list[hdr].n.ptr) == ':')
5043 continue;
5044
Willy Tarreau115e83b2018-12-01 19:17:53 +01005045 if (isteq(list[hdr].n, ist("")))
5046 break; // end
5047
5048 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
5049 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005050 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005051 goto realign_again;
5052 goto full;
5053 }
5054 }
5055
Willy Tarreaucb985a42019-10-07 16:56:34 +02005056 /* update the frame's size */
5057 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5058
5059 if (outbuf.data > h2c->mfs + 9) {
5060 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5061 /* output full */
5062 if (b_space_wraps(mbuf))
5063 goto realign_again;
5064 goto full;
5065 }
5066 }
5067
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005068 /* remove all header blocks including the EOH and compute the
5069 * corresponding size.
Willy Tarreau115e83b2018-12-01 19:17:53 +01005070 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005071 ret = 0;
5072 blk = htx_get_head_blk(htx);
5073 while (blk) {
5074 type = htx_get_blk_type(blk);
5075 ret += htx_get_blksz(blk);
5076 blk = htx_remove_blk(htx, blk);
5077 /* The removed block is the EOH */
5078 if (type == HTX_BLK_EOH)
5079 break;
Christopher Faulet5be651d2021-01-22 15:28:03 +01005080 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005081
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005082 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5083 /* Response already closed: add END_STREAM */
5084 es_now = 1;
5085 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005086 else if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx) && h2s->status >= 200) {
5087 /* EOM+empty: we may need to add END_STREAM except for 1xx
Christopher Faulet991febd2020-12-02 15:17:31 +01005088 * responses and tunneled response.
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005089 */
Christopher Faulet991febd2020-12-02 15:17:31 +01005090 if (!(h2s->flags & H2_SF_BODY_TUNNEL) || h2s->status >= 300)
5091 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005092 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005093
Willy Tarreau115e83b2018-12-01 19:17:53 +01005094 if (es_now)
5095 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5096
5097 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005098 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005099 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01005100
5101 /* indicates the HEADERS frame was sent, except for 1xx responses. For
5102 * 1xx responses, another HEADERS frame is expected.
5103 */
Christopher Faulet89899422020-12-07 18:24:43 +01005104 if (h2s->status >= 200)
Christopher Faulet0b465482019-02-19 15:14:23 +01005105 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005106
Willy Tarreau115e83b2018-12-01 19:17:53 +01005107 if (es_now) {
5108 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005109 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 +01005110 if (h2s->st == H2_SS_OPEN)
5111 h2s->st = H2_SS_HLOC;
5112 else
5113 h2s_close(h2s);
5114 }
5115
5116 /* OK we could properly deliver the response */
Willy Tarreau115e83b2018-12-01 19:17:53 +01005117 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005118 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005119 return ret;
5120 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005121 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5122 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005123 h2c->flags |= H2_CF_MUX_MFULL;
5124 h2s->flags |= H2_SF_BLK_MROOM;
5125 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005126 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 +01005127 goto end;
5128 fail:
5129 /* unparsable HTX messages, too large ones to be produced in the local
5130 * list etc go here (unrecoverable errors).
5131 */
5132 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5133 ret = 0;
5134 goto end;
5135}
5136
Willy Tarreau80739692018-10-05 11:35:57 +02005137/* Try to send a HEADERS frame matching HTX request present in HTX message
5138 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5139 * must check the stream's status to detect any error which might have happened
5140 * subsequently to a successful send. The htx blocks are automatically removed
5141 * from the message. The htx message is assumed to be valid since produced from
5142 * the internal code, hence it contains a start line, an optional series of
5143 * header blocks and an end of header, otherwise an invalid frame could be
5144 * emitted and the resulting htx message could be left in an inconsistent state.
5145 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005146static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02005147{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005148 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02005149 struct h2c *h2c = h2s->h2c;
5150 struct htx_blk *blk;
Willy Tarreau80739692018-10-05 11:35:57 +02005151 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005152 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02005153 struct htx_sl *sl;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005154 struct ist meth, uri, auth, host = IST_NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005155 enum htx_blk_type type;
5156 int es_now = 0;
5157 int ret = 0;
5158 int hdr;
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005159 int extended_connect = 0;
Willy Tarreau80739692018-10-05 11:35:57 +02005160
Willy Tarreau7838a792019-08-12 18:42:03 +02005161 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5162
Willy Tarreau80739692018-10-05 11:35:57 +02005163 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005164 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005165 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005166 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005167 return 0;
5168 }
5169
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005170 /* get the start line (we do have one) and the rest of the headers,
5171 * that we dump starting at header 0 */
5172 sl = NULL;
Willy Tarreau80739692018-10-05 11:35:57 +02005173 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005174 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005175 type = htx_get_blk_type(blk);
5176
5177 if (type == HTX_BLK_UNUSED)
5178 continue;
5179
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005180 if (type == HTX_BLK_EOH)
Willy Tarreau80739692018-10-05 11:35:57 +02005181 break;
5182
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005183 if (type == HTX_BLK_HDR) {
Christopher Faulet56498132021-01-29 11:39:43 +01005184 BUG_ON(!sl); /* The start-line mut be defined before any headers */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005185 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5186 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5187 goto fail;
5188 }
Willy Tarreau80739692018-10-05 11:35:57 +02005189
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005190 list[hdr].n = htx_get_blk_name(htx, blk);
5191 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02005192
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005193 /* Skip header if same name is used to add the server name */
5194 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
5195 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
5196 continue;
Christopher Faulet67d58092019-10-02 10:51:38 +02005197
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005198 /* Convert connection: upgrade to Extented connect from rfc 8441 */
5199 if (isteqi(list[hdr].n, ist("connection"))) {
5200 /* rfc 7230 #6.1 Connection = list of tokens */
5201 struct ist connection_ist = list[hdr].v;
5202 do {
5203 if (isteqi(iststop(connection_ist, ','),
5204 ist("upgrade"))) {
5205 h2s->flags |= (H2_SF_BODY_TUNNEL|H2_SF_EXT_CONNECT_SENT);
5206 sl->info.req.meth = HTTP_METH_CONNECT;
5207 meth = ist("CONNECT");
5208
5209 extended_connect = 1;
5210 break;
5211 }
5212
5213 connection_ist = istadv(istfind(connection_ist, ','), 1);
5214 } while (istlen(connection_ist));
5215 }
5216
5217 if (isteq(list[hdr].n, ist("upgrade"))) {
5218 /* rfc 7230 #6.7 Upgrade = list of protocols
5219 * rfc 8441 #4 Extended connect = :protocol is single-valued
5220 *
5221 * only first HTTP/1 protocol is preserved
5222 */
5223 const struct ist protocol = iststop(list[hdr].v, ',');
5224 /* upgrade_protocol field is 16 bytes long in h2s */
5225 istpad(h2s->upgrade_protocol, isttrim(protocol, 15));
5226 }
5227
5228 if (isteq(list[hdr].n, ist("host")))
5229 host = list[hdr].v;
5230
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005231 hdr++;
5232 }
Christopher Fauletc29b4bf2021-01-29 11:49:16 +01005233 else if (type == HTX_BLK_REQ_SL) {
5234 BUG_ON(sl); /* Only one start-line expected */
5235 sl = htx_get_blk_ptr(htx, blk);
5236 meth = htx_sl_req_meth(sl);
5237 uri = htx_sl_req_uri(sl);
5238 if (sl->info.req.meth == HTTP_METH_HEAD)
5239 h2s->flags |= H2_SF_BODYLESS_RESP;
5240 if (unlikely(uri.len == 0)) {
5241 TRACE_ERROR("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5242 goto fail;
5243 }
5244 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005245 else {
5246 TRACE_ERROR("will not encode unexpected htx block", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5247 goto fail;
5248 }
Willy Tarreau80739692018-10-05 11:35:57 +02005249 }
5250
Christopher Faulet56498132021-01-29 11:39:43 +01005251 /* The start-line me be defined */
5252 BUG_ON(!sl);
5253
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02005254 /* Now add the server name to a header (if requested) */
5255 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
5256 struct server *srv = objt_server(h2c->conn->target);
5257
5258 if (srv) {
5259 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
5260 list[hdr].v = ist(srv->id);
5261 hdr++;
5262 }
5263 }
5264
Willy Tarreau80739692018-10-05 11:35:57 +02005265 /* marker for end of headers */
5266 list[hdr].n = ist("");
5267
Willy Tarreau9c218e72019-05-26 10:08:28 +02005268 mbuf = br_tail(h2c->mbuf);
5269 retry:
5270 if (!h2_get_buf(h2c, mbuf)) {
5271 h2c->flags |= H2_CF_MUX_MALLOC;
5272 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005273 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 +02005274 return 0;
5275 }
5276
Willy Tarreau80739692018-10-05 11:35:57 +02005277 chunk_reset(&outbuf);
5278
5279 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005280 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5281 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005282 break;
5283 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005284 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02005285 }
5286
5287 if (outbuf.size < 9)
5288 goto full;
5289
5290 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5291 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5292 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5293 outbuf.data = 9;
5294
5295 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005296 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005297 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005298 goto realign_again;
5299 goto full;
5300 }
5301
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005302 auth = ist(NULL);
5303
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005304 /* RFC7540 #8.3: the CONNECT method must have :
5305 * - :authority set to the URI part (host:port)
5306 * - :method set to CONNECT
5307 * - :scheme and :path omitted
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005308 *
5309 * Note that this is not applicable in case of the Extended CONNECT
5310 * protocol from rfc 8441.
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005311 */
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005312 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT) && !extended_connect) {
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005313 auth = uri;
5314
5315 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5316 /* output full */
5317 if (b_space_wraps(mbuf))
5318 goto realign_again;
5319 goto full;
5320 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005321 h2s->flags |= H2_SF_BODY_TUNNEL;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005322 } else {
5323 /* other methods need a :scheme. If an authority is known from
5324 * the request line, it must be sent, otherwise only host is
5325 * sent. Host is never sent as the authority.
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005326 *
5327 * This code is also applicable for Extended CONNECT protocol
5328 * from rfc 8441.
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005329 */
5330 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005331
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005332 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5333 /* the URI seems to start with a scheme */
5334 int len = 1;
5335
5336 while (len < uri.len && uri.ptr[len] != ':')
5337 len++;
5338
5339 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5340 /* make the uri start at the authority now */
5341 scheme.ptr = uri.ptr;
5342 scheme.len = len,
5343 uri.ptr += len + 3;
5344 uri.len -= len + 3;
5345
5346 /* find the auth part of the URI */
5347 auth.ptr = uri.ptr;
5348 auth.len = 0;
5349 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5350 auth.len++;
5351
5352 uri.ptr += auth.len;
5353 uri.len -= auth.len;
5354 }
5355 }
5356
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005357 /* For Extended CONNECT, the :authority must be present.
5358 * Use host value for it.
5359 */
5360 if (unlikely(extended_connect) && isttest(host))
5361 auth = host;
5362
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005363 if (!scheme.len) {
5364 /* no explicit scheme, we're using an origin-form URI,
5365 * probably from an H1 request transcoded to H2 via an
5366 * external layer, then received as H2 without authority.
5367 * So we have to look up the scheme from the HTX flags.
5368 * In such a case only http and https are possible, and
5369 * https is the default (sent by browsers).
5370 */
5371 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5372 scheme = ist("http");
5373 else
5374 scheme = ist("https");
5375 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005376
5377 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005378 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005379 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005380 goto realign_again;
5381 goto full;
5382 }
Willy Tarreau80739692018-10-05 11:35:57 +02005383
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005384 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005385 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005386 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005387 goto realign_again;
5388 goto full;
5389 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005390
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005391 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5392 * be sent as '/' or '*'.
5393 */
5394 if (unlikely(!uri.len)) {
5395 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5396 uri = ist("*");
5397 else
5398 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005399 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005400
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005401 if (!hpack_encode_path(&outbuf, uri)) {
5402 /* output full */
5403 if (b_space_wraps(mbuf))
5404 goto realign_again;
5405 goto full;
5406 }
Amaury Denoyelle9bf95732020-12-11 17:53:06 +01005407
5408 /* encode the pseudo-header protocol from rfc8441 if using
5409 * Extended CONNECT method.
5410 */
5411 if (unlikely(extended_connect)) {
5412 const struct ist protocol = ist(h2s->upgrade_protocol);
5413 if (isttest(protocol)) {
5414 if (!hpack_encode_header(&outbuf,
5415 ist(":protocol"),
5416 protocol)) {
5417 /* output full */
5418 if (b_space_wraps(mbuf))
5419 goto realign_again;
5420 goto full;
5421 }
5422 }
5423 }
Willy Tarreau80739692018-10-05 11:35:57 +02005424 }
5425
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005426 /* encode all headers, stop at empty name. Host is only sent if we
5427 * do not provide an authority.
5428 */
Willy Tarreau80739692018-10-05 11:35:57 +02005429 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005430 struct ist n = list[hdr].n;
5431 struct ist v = list[hdr].v;
5432
Willy Tarreau80739692018-10-05 11:35:57 +02005433 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005434 if (isteq(n, ist("connection")) ||
5435 (auth.len && isteq(n, ist("host"))) ||
5436 isteq(n, ist("proxy-connection")) ||
5437 isteq(n, ist("keep-alive")) ||
5438 isteq(n, ist("upgrade")) ||
5439 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005440 continue;
5441
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005442 if (isteq(n, ist("te"))) {
5443 /* "te" may only be sent with "trailers" if this value
5444 * is present, otherwise it must be deleted.
5445 */
5446 v = istist(v, ist("trailers"));
5447 if (!v.ptr || (v.len > 8 && v.ptr[8] != ','))
5448 continue;
5449 v = ist("trailers");
5450 }
5451
Christopher Faulet86d144c2019-08-14 16:32:25 +02005452 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005453 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005454 continue;
5455
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005456 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005457 break; // end
5458
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005459 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005460 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005461 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005462 goto realign_again;
5463 goto full;
5464 }
5465 }
5466
Willy Tarreaucb985a42019-10-07 16:56:34 +02005467 /* update the frame's size */
5468 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5469
5470 if (outbuf.data > h2c->mfs + 9) {
5471 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5472 /* output full */
5473 if (b_space_wraps(mbuf))
5474 goto realign_again;
5475 goto full;
5476 }
5477 }
5478
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005479 /* remove all header blocks including the EOH and compute the
5480 * corresponding size.
Willy Tarreau80739692018-10-05 11:35:57 +02005481 */
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005482 ret = 0;
5483 blk = htx_get_head_blk(htx);
5484 while (blk) {
5485 type = htx_get_blk_type(blk);
5486 ret += htx_get_blksz(blk);
5487 blk = htx_remove_blk(htx, blk);
5488 /* The removed block is the EOH */
5489 if (type == HTX_BLK_EOH)
5490 break;
Christopher Fauletd0db4232021-01-22 11:46:30 +01005491 }
Willy Tarreau80739692018-10-05 11:35:57 +02005492
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005493 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW) {
5494 /* Request already closed: add END_STREAM */
Willy Tarreau80739692018-10-05 11:35:57 +02005495 es_now = 1;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005496 }
5497 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5498 /* EOM+empty: we may need to add END_STREAM (except for CONNECT
5499 * request)
5500 */
5501 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5502 es_now = 1;
5503 }
Willy Tarreau80739692018-10-05 11:35:57 +02005504
Willy Tarreau80739692018-10-05 11:35:57 +02005505 if (es_now)
5506 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5507
5508 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005509 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005510 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005511 h2s->flags |= H2_SF_HEADERS_SENT;
5512 h2s->st = H2_SS_OPEN;
5513
Willy Tarreau80739692018-10-05 11:35:57 +02005514 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005515 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 +02005516 // trim any possibly pending data (eg: inconsistent content-length)
5517 h2s->flags |= H2_SF_ES_SENT;
5518 h2s->st = H2_SS_HLOC;
5519 }
5520
Willy Tarreau80739692018-10-05 11:35:57 +02005521 end:
5522 return ret;
5523 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005524 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5525 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005526 h2c->flags |= H2_CF_MUX_MFULL;
5527 h2s->flags |= H2_SF_BLK_MROOM;
5528 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005529 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 +02005530 goto end;
5531 fail:
5532 /* unparsable HTX messages, too large ones to be produced in the local
5533 * list etc go here (unrecoverable errors).
5534 */
5535 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5536 ret = 0;
5537 goto end;
5538}
5539
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005540/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005541 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5542 * caller must check the stream's status to detect any error which might have
5543 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005544 * consumed, or zero if nothing done.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005545 */
Christopher Faulet142854b2020-12-02 15:12:40 +01005546static size_t h2s_make_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005547{
5548 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005549 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005550 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005551 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005552 size_t total = 0;
5553 int es_now = 0;
5554 int bsize; /* htx block size */
5555 int fsize; /* h2 frame size */
5556 struct htx_blk *blk;
5557 enum htx_blk_type type;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005558 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005559
Willy Tarreau7838a792019-08-12 18:42:03 +02005560 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5561
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005562 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005563 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005564 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005565 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005566 goto end;
5567 }
5568
Willy Tarreau98de12a2018-12-12 07:03:00 +01005569 htx = htx_from_buf(buf);
5570
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005571 /* We only come here with HTX_BLK_DATA blocks */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005572
5573 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005574 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005575 goto end;
5576
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005577 if ((h2c->flags & H2_CF_IS_BACK) &&
Christopher Fauletf95f8762021-01-22 11:59:07 +01005578 (h2s->flags & (H2_SF_HEADERS_RCVD|H2_SF_BODY_TUNNEL)) == H2_SF_BODY_TUNNEL) {
5579 /* The response HEADERS frame not received yet. Thus the tunnel
5580 * is not fully established yet. In this situation, we block
5581 * data sending.
5582 */
5583 h2s->flags |= H2_SF_BLK_MBUSY;
5584 TRACE_STATE("Request DATA frame blocked waiting for tunnel establishment", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5585 goto end;
5586 }
Christopher Faulet91b21dc2021-01-22 12:13:15 +01005587 else if ((h2c->flags & H2_CF_IS_BACK) && (h2s->flags & H2_SF_TUNNEL_ABRT)) {
5588 /* a tunnel attempt was aborted but the is pending raw data to xfer to the server.
5589 * Thus the stream is closed with the CANCEL error. The error will be reported to
5590 * the upper layer as aserver abort. But at this stage there is nothing more we can
5591 * do. We just wait for the end of the response to be sure to not truncate it.
5592 */
5593 if (!(h2s->flags & H2_SF_ES_RCVD)) {
5594 TRACE_STATE("Request DATA frame blocked waiting end of aborted tunnel", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5595 h2s->flags |= H2_SF_BLK_MBUSY;
5596 }
5597 else {
5598 TRACE_ERROR("Request DATA frame for aborted tunnel", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
5599 h2s_error(h2s, H2_ERR_CANCEL);
5600 }
5601 goto end;
5602 }
Willy Tarreau98de12a2018-12-12 07:03:00 +01005603
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005604 blk = htx_get_head_blk(htx);
5605 type = htx_get_blk_type(blk);
5606 bsize = htx_get_blksz(blk);
5607 fsize = bsize;
5608 trunc_out = 0;
5609 if (type != HTX_BLK_DATA)
5610 goto end;
5611
Willy Tarreau9c218e72019-05-26 10:08:28 +02005612 mbuf = br_tail(h2c->mbuf);
5613 retry:
5614 if (!h2_get_buf(h2c, mbuf)) {
5615 h2c->flags |= H2_CF_MUX_MALLOC;
5616 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005617 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 +02005618 goto end;
5619 }
5620
Willy Tarreau98de12a2018-12-12 07:03:00 +01005621 /* Perform some optimizations to reduce the number of buffer copies.
5622 * First, if the mux's buffer is empty and the htx area contains
5623 * exactly one data block of the same size as the requested count, and
5624 * this count fits within the frame size, the stream's window size, and
5625 * the connection's window size, then it's possible to simply swap the
5626 * caller's buffer with the mux's output buffer and adjust offsets and
5627 * length to match the entire DATA HTX block in the middle. In this
5628 * case we perform a true zero-copy operation from end-to-end. This is
5629 * the situation that happens all the time with large files. Second, if
5630 * this is not possible, but the mux's output buffer is empty, we still
5631 * have an opportunity to avoid the copy to the intermediary buffer, by
5632 * making the intermediary buffer's area point to the output buffer's
5633 * area. In this case we want to skip the HTX header to make sure that
5634 * copies remain aligned and that this operation remains possible all
5635 * the time. This goes for headers, data blocks and any data extracted
5636 * from the HTX blocks.
5637 */
5638 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005639 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005640 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005641 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005642
Willy Tarreaubcc45952019-05-26 10:05:50 +02005643 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005644 /* Too bad there are data left there. We're willing to memcpy/memmove
5645 * up to 1/4 of the buffer, which means that it's OK to copy a large
5646 * frame into a buffer containing few data if it needs to be realigned,
5647 * and that it's also OK to copy few data without realigning. Otherwise
5648 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005649 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005650 if (fsize + 9 <= b_room(mbuf) &&
5651 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005652 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5653 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 +01005654 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005655 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005656
Willy Tarreau9c218e72019-05-26 10:08:28 +02005657 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5658 goto retry;
5659
Willy Tarreau98de12a2018-12-12 07:03:00 +01005660 h2c->flags |= H2_CF_MUX_MFULL;
5661 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005662 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 +01005663 goto end;
5664 }
5665
5666 /* map an H2 frame to the HTX block so that we can put the
5667 * frame header there.
5668 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005669 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5670 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005671
5672 /* prepend an H2 DATA frame header just before the DATA block */
5673 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5674 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5675 h2_set_frame_size(outbuf.area, fsize);
5676
5677 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005678 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005679 h2c->mws -= fsize;
5680
5681 /* and exchange with our old area */
5682 buf->area = old_area;
5683 buf->data = buf->head = 0;
5684 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005685
5686 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 +01005687 goto end;
5688 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005689
Willy Tarreau98de12a2018-12-12 07:03:00 +01005690 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005691 /* for DATA and EOM we'll have to emit a frame, even if empty */
5692
5693 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005694 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5695 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005696 break;
5697 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005698 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005699 }
5700
5701 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005702 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5703 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005704 h2c->flags |= H2_CF_MUX_MFULL;
5705 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005706 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005707 goto end;
5708 }
5709
5710 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5711 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5712 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5713 outbuf.data = 9;
5714
5715 /* we have in <fsize> the exact number of bytes we need to copy from
5716 * the HTX buffer. We need to check this against the connection's and
5717 * the stream's send windows, and to ensure that this fits in the max
5718 * frame size and in the buffer's available space minus 9 bytes (for
5719 * the frame header). The connection's flow control is applied last so
5720 * that we can use a separate list of streams which are immediately
5721 * unblocked on window opening. Note: we don't implement padding.
5722 */
5723
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005724 if (!fsize)
5725 goto send_empty;
5726
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005727 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005728 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005729 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005730 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005731 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005732 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 +01005733 goto end;
5734 }
5735
Willy Tarreauee573762018-12-04 15:25:57 +01005736 if (fsize > count)
5737 fsize = count;
5738
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005739 if (fsize > h2s_mws(h2s))
5740 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005741
5742 if (h2c->mfs && fsize > h2c->mfs)
5743 fsize = h2c->mfs; // >0
5744
5745 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005746 /* It doesn't fit at once. If it at least fits once split and
5747 * the amount of data to move is low, let's defragment the
5748 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005749 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005750 if (b_space_wraps(mbuf) &&
5751 (fsize + 9 <= b_room(mbuf)) &&
5752 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005753 goto realign_again;
5754 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005755 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005756
5757 if (fsize <= 0) {
5758 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005759 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5760 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005761 h2c->flags |= H2_CF_MUX_MFULL;
5762 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005763 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005764 goto end;
5765 }
5766 }
5767
5768 if (h2c->mws <= 0) {
5769 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005770 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 +01005771 goto end;
5772 }
5773
5774 if (fsize > h2c->mws)
5775 fsize = h2c->mws;
5776
5777 /* now let's copy this this into the output buffer */
5778 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005779 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005780 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005781 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005782
5783 send_empty:
5784 /* update the frame's size */
5785 h2_set_frame_size(outbuf.area, fsize);
5786
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005787 /* consume incoming HTX block */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005788 total += fsize;
5789 if (fsize == bsize) {
5790 htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005791 if ((htx->flags & HTX_FL_EOM) && htx_is_empty(htx)) {
5792 /* EOM+empty: we may need to add END_STREAM (except for tunneled
5793 * message)
5794 */
5795 if (!(h2s->flags & H2_SF_BODY_TUNNEL))
5796 es_now = 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02005797 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005798 }
5799 else {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005800 /* we've truncated this block */
5801 htx_cut_data_blk(htx, blk, fsize);
5802 }
5803
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005804 if (es_now)
5805 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5806
5807 /* commit the H2 response */
5808 b_add(mbuf, fsize + 9);
5809
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005810 if (es_now) {
5811 if (h2s->st == H2_SS_OPEN)
5812 h2s->st = H2_SS_HLOC;
5813 else
5814 h2s_close(h2s);
5815
5816 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005817 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 +01005818 }
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005819 else if (fsize) {
5820 if (fsize == bsize) {
5821 TRACE_DEVEL("more data may be available, trying to send another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5822 goto new_frame;
5823 }
5824 else if (trunc_out) {
5825 /* we've truncated this block */
5826 goto new_frame;
5827 }
5828 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005829
5830 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005831 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005832 return total;
5833}
5834
Christopher Faulet991febd2020-12-02 15:17:31 +01005835/* Skip the message payload (DATA blocks) and emit an empty DATA frame with the
5836 * ES flag set for stream <h2s>. This function is called for response known to
5837 * have no payload. Only DATA blocks are skipped. This means the trailers are
5838 * still emited. The caller must check the stream's status to detect any error
5839 * which might have happened subsequently to a successful send. Returns the
5840 * number of data bytes consumed, or zero if nothing done.
5841 */
5842static size_t h2s_skip_data(struct h2s *h2s, struct buffer *buf, size_t count)
5843{
5844 struct h2c *h2c = h2s->h2c;
5845 struct htx *htx;
5846 int bsize; /* htx block size */
5847 int fsize; /* h2 frame size */
5848 struct htx_blk *blk;
5849 enum htx_blk_type type;
5850 size_t total = 0;
5851
5852 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5853
5854 if (h2c_mux_busy(h2c, h2s)) {
5855 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5856 h2s->flags |= H2_SF_BLK_MBUSY;
5857 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5858 goto end;
5859 }
5860
5861 htx = htx_from_buf(buf);
5862
5863 next_data:
5864 if (!count || htx_is_empty(htx))
5865 goto end;
5866 blk = htx_get_head_blk(htx);
5867 type = htx_get_blk_type(blk);
5868 bsize = htx_get_blksz(blk);
5869 fsize = bsize;
5870 if (type != HTX_BLK_DATA)
5871 goto end;
5872
5873 if (fsize > count)
5874 fsize = count;
5875
5876 if (fsize != bsize)
5877 goto skip_data;
5878
5879 if (!(htx->flags & HTX_FL_EOM) || !htx_is_unique_blk(htx, blk))
5880 goto skip_data;
5881
5882 /* Here, it is the last block and it is also the end of the message. So
5883 * we can emit an empty DATA frame with the ES flag set
5884 */
5885 if (h2_send_empty_data_es(h2s) <= 0)
5886 goto end;
5887
5888 if (h2s->st == H2_SS_OPEN)
5889 h2s->st = H2_SS_HLOC;
5890 else
5891 h2s_close(h2s);
5892
5893 skip_data:
5894 /* consume incoming HTX block */
5895 total += fsize;
5896 if (fsize == bsize) {
5897 TRACE_DEVEL("more data may be available, trying to skip another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5898 htx_remove_blk(htx, blk);
5899 goto next_data;
5900 }
5901 else {
5902 /* we've truncated this block */
5903 htx_cut_data_blk(htx, blk, fsize);
5904 }
5905
5906 end:
5907 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5908 return total;
5909}
5910
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005911/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5912 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5913 * processed. The caller must check the stream's status to detect any error
5914 * which might have happened subsequently to a successful send. The htx blocks
5915 * are automatically removed from the message. The htx message is assumed to be
5916 * valid since produced from the internal code. Processing stops when meeting
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005917 * the EOT, which *is* removed. All trailers are processed at once and sent as a
5918 * single frame. The ES flag is always set.
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005919 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005920static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005921{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005922 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005923 struct h2c *h2c = h2s->h2c;
5924 struct htx_blk *blk;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005925 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005926 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005927 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005928 int ret = 0;
5929 int hdr;
5930 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005931
Willy Tarreau7838a792019-08-12 18:42:03 +02005932 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5933
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005934 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005935 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005936 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005937 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005938 goto end;
5939 }
5940
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005941 /* get trailers. */
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005942 hdr = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005943 for (blk = htx_get_head_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005944 type = htx_get_blk_type(blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005945
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005946 if (type == HTX_BLK_UNUSED)
5947 continue;
5948
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005949 if (type == HTX_BLK_EOT)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005950 break;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005951 if (type == HTX_BLK_TLR) {
5952 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5953 TRACE_ERROR("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5954 goto fail;
5955 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005956
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01005957 list[hdr].n = htx_get_blk_name(htx, blk);
5958 list[hdr].v = htx_get_blk_value(htx, blk);
5959 hdr++;
5960 }
5961 else {
5962 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 +01005963 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005964 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005965 }
5966
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005967 /* marker for end of trailers */
5968 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005969
Willy Tarreau9c218e72019-05-26 10:08:28 +02005970 mbuf = br_tail(h2c->mbuf);
5971 retry:
5972 if (!h2_get_buf(h2c, mbuf)) {
5973 h2c->flags |= H2_CF_MUX_MALLOC;
5974 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005975 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 +02005976 goto end;
5977 }
5978
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005979 chunk_reset(&outbuf);
5980
5981 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005982 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5983 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005984 break;
5985 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005986 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005987 }
5988
5989 if (outbuf.size < 9)
5990 goto full;
5991
5992 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5993 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5994 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5995 outbuf.data = 9;
5996
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005997 /* encode all headers */
5998 for (idx = 0; idx < hdr; idx++) {
5999 /* these ones do not exist in H2 or must not appear in
6000 * trailers and must be dropped.
6001 */
6002 if (isteq(list[idx].n, ist("host")) ||
6003 isteq(list[idx].n, ist("content-length")) ||
6004 isteq(list[idx].n, ist("connection")) ||
6005 isteq(list[idx].n, ist("proxy-connection")) ||
6006 isteq(list[idx].n, ist("keep-alive")) ||
6007 isteq(list[idx].n, ist("upgrade")) ||
6008 isteq(list[idx].n, ist("te")) ||
6009 isteq(list[idx].n, ist("transfer-encoding")))
6010 continue;
6011
Christopher Faulet86d144c2019-08-14 16:32:25 +02006012 /* Skip all pseudo-headers */
6013 if (*(list[idx].n.ptr) == ':')
6014 continue;
6015
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006016 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
6017 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02006018 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006019 goto realign_again;
6020 goto full;
6021 }
6022 }
6023
Willy Tarreau5121e5d2019-05-06 15:13:41 +02006024 if (outbuf.data == 9) {
6025 /* here we have a problem, we have nothing to emit (either we
6026 * received an empty trailers block followed or we removed its
6027 * contents above). Because of this we can't send a HEADERS
6028 * frame, so we have to cheat and instead send an empty DATA
6029 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01006030 */
6031 outbuf.area[3] = H2_FT_DATA;
6032 outbuf.area[4] = H2_F_DATA_END_STREAM;
6033 }
6034
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006035 /* update the frame's size */
6036 h2_set_frame_size(outbuf.area, outbuf.data - 9);
6037
Willy Tarreau572d9f52019-10-11 16:58:37 +02006038 if (outbuf.data > h2c->mfs + 9) {
6039 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
6040 /* output full */
6041 if (b_space_wraps(mbuf))
6042 goto realign_again;
6043 goto full;
6044 }
6045 }
6046
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006047 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02006048 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 +02006049 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006050 h2s->flags |= H2_SF_ES_SENT;
6051
6052 if (h2s->st == H2_SS_OPEN)
6053 h2s->st = H2_SS_HLOC;
6054 else
6055 h2s_close(h2s);
6056
6057 /* OK we could properly deliver the response */
6058 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02006059 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006060 ret = 0;
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006061 blk = htx_get_head_blk(htx);
6062 while (blk) {
6063 type = htx_get_blk_type(blk);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006064 ret += htx_get_blksz(blk);
6065 blk = htx_remove_blk(htx, blk);
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006066 /* The removed block is the EOT */
6067 if (type == HTX_BLK_EOT)
6068 break;
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006069 }
6070
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006071 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02006072 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006073 return ret;
6074 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02006075 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
6076 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006077 h2c->flags |= H2_CF_MUX_MFULL;
6078 h2s->flags |= H2_SF_BLK_MROOM;
6079 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006080 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 +01006081 goto end;
6082 fail:
6083 /* unparsable HTX messages, too large ones to be produced in the local
6084 * list etc go here (unrecoverable errors).
6085 */
6086 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
6087 ret = 0;
6088 goto end;
6089}
6090
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006091/* Called from the upper layer, to subscribe <es> to events <event_type>. The
6092 * event subscriber <es> is not allowed to change from a previous call as long
6093 * as at least one event is still subscribed. The <event_type> must only be a
6094 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006095 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006096static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02006097{
Olivier Houchard6ff20392018-07-17 18:46:31 +02006098 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02006099 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006100
Willy Tarreau7838a792019-08-12 18:42:03 +02006101 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006102
6103 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006104 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006105
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006106 es->events |= event_type;
6107 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006108
6109 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006110 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006111
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006112 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006113 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02006114 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
6115 !LIST_ADDED(&h2s->list)) {
6116 if (h2s->flags & H2_SF_BLK_MFCTL)
6117 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
6118 else
6119 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02006120 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02006121 }
Willy Tarreau7838a792019-08-12 18:42:03 +02006122 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006123 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02006124}
6125
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006126/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
6127 * The <es> pointer is not allowed to differ from the one passed to the
6128 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006129 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006130static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006131{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006132 struct h2s *h2s = cs->ctx;
6133
Willy Tarreau7838a792019-08-12 18:42:03 +02006134 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006135
6136 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006137 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01006138
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01006139 es->events &= ~event_type;
6140 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01006141 h2s->subs = NULL;
6142
6143 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02006144 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006145
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006146 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006147 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01006148 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01006149 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
6150 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02006151 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01006152
Willy Tarreau7838a792019-08-12 18:42:03 +02006153 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006154 return 0;
6155}
6156
6157
Olivier Houchard511efea2018-08-16 15:30:32 +02006158/* Called from the upper layer, to receive data */
6159static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
6160{
Olivier Houchard638b7992018-08-16 15:41:52 +02006161 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01006162 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01006163 struct htx *h2s_htx = NULL;
6164 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02006165 size_t ret = 0;
6166
Willy Tarreau7838a792019-08-12 18:42:03 +02006167 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
6168
Olivier Houchard511efea2018-08-16 15:30:32 +02006169 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006170 h2s_htx = htx_from_buf(&h2s->rxbuf);
6171 if (htx_is_empty(h2s_htx)) {
6172 /* Here htx_to_buf() will set buffer data to 0 because
6173 * the HTX is empty.
6174 */
6175 htx_to_buf(h2s_htx, &h2s->rxbuf);
6176 goto end;
6177 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01006178
Christopher Faulet9b79a102019-07-15 11:22:56 +02006179 ret = h2s_htx->data;
6180 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01006181
Christopher Faulet9b79a102019-07-15 11:22:56 +02006182 /* <buf> is empty and the message is small enough, swap the
6183 * buffers. */
6184 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01006185 htx_to_buf(buf_htx, buf);
6186 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006187 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
6188 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01006189 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02006190
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006191 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_UNUSED);
Christopher Faulet9b79a102019-07-15 11:22:56 +02006192
6193 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
6194 buf_htx->flags |= HTX_FL_PARSING_ERROR;
6195 if (htx_is_empty(buf_htx))
6196 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01006197 }
Christopher Faulet810df062020-07-22 16:20:34 +02006198 else if (htx_is_empty(h2s_htx))
Christopher Faulet42432f32020-11-20 17:43:16 +01006199 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006200
Christopher Faulet9b79a102019-07-15 11:22:56 +02006201 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
6202 htx_to_buf(buf_htx, buf);
6203 htx_to_buf(h2s_htx, &h2s->rxbuf);
6204 ret -= h2s_htx->data;
6205
Christopher Faulet37070b22019-02-14 15:12:14 +01006206 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02006207 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01006208 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006209 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01006210 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletd0db4232021-01-22 11:46:30 +01006211 if (h2s->flags & H2_SF_ES_RCVD) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02006212 cs->flags |= CS_FL_EOI;
Christopher Fauletd0db4232021-01-22 11:46:30 +01006213 /* Add EOS flag for tunnel */
6214 if (h2s->flags & H2_SF_BODY_TUNNEL)
6215 cs->flags |= CS_FL_EOS;
6216 }
Christopher Fauletaade4ed2020-10-08 15:38:41 +02006217 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02006218 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01006219 if (cs->flags & CS_FL_ERR_PENDING)
6220 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02006221 if (b_size(&h2s->rxbuf)) {
6222 b_free(&h2s->rxbuf);
6223 offer_buffers(NULL, tasks_run_queue);
6224 }
Olivier Houchard511efea2018-08-16 15:30:32 +02006225 }
6226
Willy Tarreau082f5592018-11-25 08:03:32 +01006227 if (ret && h2c->dsi == h2s->id) {
6228 /* demux is blocking on this stream's buffer */
6229 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02006230 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01006231 }
Christopher Faulet37070b22019-02-14 15:12:14 +01006232
Willy Tarreau7838a792019-08-12 18:42:03 +02006233 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02006234 return ret;
6235}
6236
Olivier Houchardd846c262018-10-19 17:24:29 +02006237
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006238/* Called from the upper layer, to send data from buffer <buf> for no more than
6239 * <count> bytes. Returns the number of bytes effectively sent. Some status
6240 * flags may be updated on the conn_stream.
6241 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02006242static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02006243{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006244 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02006245 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02006246 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006247 struct htx *htx;
6248 struct htx_blk *blk;
6249 enum htx_blk_type btype;
6250 uint32_t bsize;
6251 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006252
Willy Tarreau7838a792019-08-12 18:42:03 +02006253 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
6254
Olivier Houchardd360ac62019-03-22 17:37:16 +01006255 /* If we were not just woken because we wanted to send but couldn't,
6256 * and there's somebody else that is waiting to send, do nothing,
6257 * we will subscribe later and be put at the end of the list
6258 */
Willy Tarreaud9464162020-01-10 18:25:07 +01006259 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02006260 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
6261 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 +01006262 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006263 }
Willy Tarreaud9464162020-01-10 18:25:07 +01006264 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02006265
Willy Tarreau7838a792019-08-12 18:42:03 +02006266 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
6267 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 +02006268 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006269 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006270
Willy Tarreaucab22952019-10-31 15:48:18 +01006271 if (h2s->h2c->st0 >= H2_CS_ERROR) {
6272 cs->flags |= CS_FL_ERROR;
6273 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);
6274 return 0;
6275 }
6276
Christopher Faulet9b79a102019-07-15 11:22:56 +02006277 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006278
Willy Tarreau0bad0432018-06-14 16:54:01 +02006279 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01006280 h2s->flags |= H2_SF_OUTGOING_DATA;
6281
Willy Tarreau751f2d02018-10-05 09:35:00 +02006282 if (h2s->id == 0) {
6283 int32_t id = h2c_get_next_sid(h2s->h2c);
6284
6285 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02006286 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02006287 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 +02006288 return 0;
6289 }
6290
6291 eb32_delete(&h2s->by_id);
6292 h2s->by_id.key = h2s->id = id;
6293 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01006294 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02006295 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
6296 }
6297
Christopher Faulet9b79a102019-07-15 11:22:56 +02006298 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
6299 count && !htx_is_empty(htx)) {
6300 idx = htx_get_head(htx);
6301 blk = htx_get_blk(htx, idx);
6302 btype = htx_get_blk_type(blk);
6303 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006304
Christopher Faulet9b79a102019-07-15 11:22:56 +02006305 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02006306 case HTX_BLK_REQ_SL:
6307 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006308 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02006309 if (ret > 0) {
6310 total += ret;
6311 count -= ret;
6312 if (ret < bsize)
6313 goto done;
6314 }
6315 break;
6316
Willy Tarreau115e83b2018-12-01 19:17:53 +01006317 case HTX_BLK_RES_SL:
6318 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006319 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01006320 if (ret > 0) {
6321 total += ret;
6322 count -= ret;
6323 if (ret < bsize)
6324 goto done;
6325 }
6326 break;
6327
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006328 case HTX_BLK_DATA:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006329 /* all these cause the emission of a DATA frame (possibly empty) */
Christopher Faulet991febd2020-12-02 15:17:31 +01006330 if (!(h2s->h2c->flags & H2_CF_IS_BACK) &&
6331 (h2s->flags & (H2_SF_BODY_TUNNEL|H2_SF_BODYLESS_RESP)) == H2_SF_BODYLESS_RESP)
6332 ret = h2s_skip_data(h2s, buf, count);
6333 else
6334 ret = h2s_make_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006335 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01006336 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006337 total += ret;
6338 count -= ret;
6339 if (ret < bsize)
6340 goto done;
6341 }
6342 break;
6343
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006344 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006345 case HTX_BLK_EOT:
Christopher Fauletd1ac2b92020-12-02 19:12:22 +01006346 /* This is the first trailers block, all the subsequent ones */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006347 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006348 if (ret > 0) {
6349 total += ret;
6350 count -= ret;
6351 if (ret < bsize)
6352 goto done;
6353 }
6354 break;
6355
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006356 default:
6357 htx_remove_blk(htx, blk);
6358 total += bsize;
6359 count -= bsize;
6360 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006361 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006362 }
6363
Christopher Faulet9b79a102019-07-15 11:22:56 +02006364 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02006365 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02006366 /* trim any possibly pending data after we close (extra CR-LF,
6367 * unprocessed trailers, abnormal extra data, ...)
6368 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02006369 total += count;
6370 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02006371 }
6372
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006373 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01006374 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006375 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 +01006376 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01006377 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01006378 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006379 }
6380
Christopher Faulet9b79a102019-07-15 11:22:56 +02006381 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02006382
Olivier Houchard7505f942018-08-21 18:10:44 +02006383 if (total > 0) {
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006384 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006385 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 +02006386 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Tim Duesterhus12a08d82020-12-21 19:40:16 +01006387 }
Olivier Houchardd846c262018-10-19 17:24:29 +02006388
Olivier Houchard7505f942018-08-21 18:10:44 +02006389 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006390 /* If we're waiting for flow control, and we got a shutr on the
6391 * connection, we will never be unlocked, so add an error on
6392 * the conn_stream.
6393 */
6394 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
6395 !b_data(&h2s->h2c->dbuf) &&
6396 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006397 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 +01006398 if (cs->flags & CS_FL_EOS)
6399 cs->flags |= CS_FL_ERROR;
6400 else
6401 cs->flags |= CS_FL_ERR_PENDING;
6402 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006403
Willy Tarreau5723f292020-01-10 15:16:57 +01006404 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6405 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006406 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006407 LIST_DEL_INIT(&h2s->list);
6408 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006409
Willy Tarreau7838a792019-08-12 18:42:03 +02006410 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006411 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006412}
6413
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006414/* for debugging with CLI's "show fd" command */
Willy Tarreau8050efe2021-01-21 08:26:06 +01006415static int h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006416{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006417 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006418 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006419 struct eb32_node *node;
6420 int fctl_cnt = 0;
6421 int send_cnt = 0;
6422 int tree_cnt = 0;
6423 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006424 struct buffer *hmbuf, *tmbuf;
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006425 int ret = 0;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006426
6427 if (!h2c)
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006428 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006429
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006430 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006431 fctl_cnt++;
6432
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006433 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006434 send_cnt++;
6435
Willy Tarreau3af37712018-12-18 14:34:41 +01006436 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006437 node = eb32_first(&h2c->streams_by_id);
6438 while (node) {
6439 h2s = container_of(node, struct h2s, by_id);
6440 tree_cnt++;
6441 if (!h2s->cs)
6442 orph_cnt++;
6443 node = eb32_next(node);
6444 }
6445
Willy Tarreau60f62682019-05-26 11:32:27 +02006446 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006447 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006448 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006449 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006450 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6451 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006452 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006453 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006454 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006455 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6456 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6457 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006458 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6459 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6460 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006461 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6462 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006463
6464 if (h2s) {
Willy Tarreaued4464e2021-01-20 15:50:03 +01006465 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 +02006466 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006467 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6468 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6469 h2s->cs);
6470 if (h2s->cs)
Willy Tarreau98e40b92021-01-20 16:27:01 +01006471 chunk_appendf(msg, "(.flg=0x%08x .data=%p)",
Willy Tarreau987c0632018-12-18 10:32:05 +01006472 h2s->cs->flags, h2s->cs->data);
Willy Tarreau98e40b92021-01-20 16:27:01 +01006473
6474 chunk_appendf(&trash, " .subs=%p", h2s->subs);
6475 if (h2s->subs) {
6476 if (h2s->subs) {
6477 chunk_appendf(&trash, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet);
6478 chunk_appendf(&trash, " tl.calls=%d tl.ctx=%p tl.fct=",
6479 h2s->subs->tasklet->calls,
6480 h2s->subs->tasklet->context);
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006481 if (h2s->subs->tasklet->calls >= 1000000)
6482 ret = 1;
Willy Tarreau98e40b92021-01-20 16:27:01 +01006483 resolve_sym_name(&trash, NULL, h2s->subs->tasklet->process);
6484 chunk_appendf(&trash, ")");
6485 }
6486 }
Willy Tarreau987c0632018-12-18 10:32:05 +01006487 }
Willy Tarreau06bf83e2021-01-21 09:13:35 +01006488 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006489}
Willy Tarreau62f52692017-10-08 23:01:42 +02006490
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006491/* Migrate the the connection to the current thread.
6492 * Return 0 if successful, non-zero otherwise.
6493 * Expected to be called with the old thread lock held.
6494 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006495static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006496{
6497 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006498 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006499
6500 if (fd_takeover(conn->handle.fd, conn) != 0)
6501 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006502
6503 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6504 /* We failed to takeover the xprt, even if the connection may
6505 * still be valid, flag it as error'd, as we have already
6506 * taken over the fd, and wake the tasklet, so that it will
6507 * destroy it.
6508 */
6509 conn->flags |= CO_FL_ERROR;
6510 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6511 return -1;
6512 }
6513
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006514 if (h2c->wait_event.events)
6515 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6516 h2c->wait_event.events, &h2c->wait_event);
6517 /* To let the tasklet know it should free itself, and do nothing else,
6518 * set its context to NULL.
6519 */
6520 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006521 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006522
6523 task = h2c->task;
6524 if (task) {
6525 task->context = NULL;
6526 h2c->task = NULL;
6527 __ha_barrier_store();
6528 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006529
6530 h2c->task = task_new(tid_bit);
6531 if (!h2c->task) {
6532 h2_release(h2c);
6533 return -1;
6534 }
6535 h2c->task->process = h2_timeout_task;
6536 h2c->task->context = h2c;
6537 }
6538 h2c->wait_event.tasklet = tasklet_new();
6539 if (!h2c->wait_event.tasklet) {
6540 h2_release(h2c);
6541 return -1;
6542 }
6543 h2c->wait_event.tasklet->process = h2_io_cb;
6544 h2c->wait_event.tasklet->context = h2c;
6545 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6546 SUB_RETRY_RECV, &h2c->wait_event);
6547
6548 return 0;
6549}
6550
Willy Tarreau62f52692017-10-08 23:01:42 +02006551/*******************************************************/
6552/* functions below are dedicated to the config parsers */
6553/*******************************************************/
6554
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006555/* config parser for global "tune.h2.header-table-size" */
6556static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
6557 struct proxy *defpx, const char *file, int line,
6558 char **err)
6559{
6560 if (too_many_args(1, args, err, NULL))
6561 return -1;
6562
6563 h2_settings_header_table_size = atoi(args[1]);
6564 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6565 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6566 return -1;
6567 }
6568 return 0;
6569}
Willy Tarreau62f52692017-10-08 23:01:42 +02006570
Willy Tarreaue6baec02017-07-27 11:45:11 +02006571/* config parser for global "tune.h2.initial-window-size" */
6572static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
6573 struct proxy *defpx, const char *file, int line,
6574 char **err)
6575{
6576 if (too_many_args(1, args, err, NULL))
6577 return -1;
6578
6579 h2_settings_initial_window_size = atoi(args[1]);
6580 if (h2_settings_initial_window_size < 0) {
6581 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6582 return -1;
6583 }
6584 return 0;
6585}
6586
Willy Tarreau5242ef82017-07-27 11:47:28 +02006587/* config parser for global "tune.h2.max-concurrent-streams" */
6588static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
6589 struct proxy *defpx, const char *file, int line,
6590 char **err)
6591{
6592 if (too_many_args(1, args, err, NULL))
6593 return -1;
6594
6595 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006596 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006597 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6598 return -1;
6599 }
6600 return 0;
6601}
6602
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006603/* config parser for global "tune.h2.max-frame-size" */
6604static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
6605 struct proxy *defpx, const char *file, int line,
6606 char **err)
6607{
6608 if (too_many_args(1, args, err, NULL))
6609 return -1;
6610
6611 h2_settings_max_frame_size = atoi(args[1]);
6612 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6613 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6614 return -1;
6615 }
6616 return 0;
6617}
6618
Willy Tarreau62f52692017-10-08 23:01:42 +02006619
6620/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006621/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006622/***************************************/
6623
6624/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006625static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006626 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006627 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006628 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006629 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006630 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006631 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006632 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006633 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006634 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006635 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006636 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006637 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006638 .shutr = h2_shutr,
6639 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006640 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006641 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006642 .takeover = h2_takeover,
Amaury Denoyelle3d3c0912020-10-14 18:17:06 +02006643 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK,
Willy Tarreau62f52692017-10-08 23:01:42 +02006644 .name = "H2",
6645};
6646
Christopher Faulet32f61c02018-04-10 14:33:41 +02006647static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006648 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006649
Willy Tarreau0108d902018-11-25 19:14:37 +01006650INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6651
Willy Tarreau62f52692017-10-08 23:01:42 +02006652/* config keyword parsers */
6653static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006654 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006655 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006656 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006657 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006658 { 0, NULL, NULL }
6659}};
6660
Willy Tarreau0108d902018-11-25 19:14:37 +01006661INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006662
6663/* initialize internal structs after the config is parsed.
6664 * Returns zero on success, non-zero on error.
6665 */
6666static int init_h2()
6667{
6668 pool_head_hpack_tbl = create_pool("hpack_tbl",
6669 h2_settings_header_table_size,
6670 MEM_F_SHARED|MEM_F_EXACT);
Christopher Faulet52140992020-11-06 15:23:39 +01006671 if (!pool_head_hpack_tbl) {
6672 ha_alert("failed to allocate hpack_tbl memory pool\n");
6673 return (ERR_ALERT | ERR_FATAL);
6674 }
6675 return ERR_NONE;
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006676}
6677
6678REGISTER_POST_CHECK(init_h2);