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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 Tarreau1369ea22021-01-20 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
Willy Tarreaud9464162020-01-10 18:25:07 +0100182/* unused flags: 0x00000200, 0x00000400 */
Willy Tarreau454f9052017-10-26 19:40:35 +0200183
Willy Tarreaud9464162020-01-10 18:25:07 +0100184#define H2_SF_NOTIFIED 0x00000800 // a paused stream was notified to try to send again
Willy Tarreau67434202017-11-06 20:20:51 +0100185#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100186#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100187
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100188#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
189
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200190#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
191#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200192#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200193
194
Willy Tarreau18312642017-10-11 07:57:07 +0200195/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
Christopher Fauletfafd1b02020-11-03 18:25:52 +0100196 * it is being processed in the internal HTTP representation (HTX).
Willy Tarreau18312642017-10-11 07:57:07 +0200197 */
198struct h2s {
199 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100200 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200201 struct h2c *h2c;
Willy Tarreau18312642017-10-11 07:57:07 +0200202 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200203 int32_t id; /* stream ID */
204 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200205 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200206 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
207 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200208 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100209 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200210 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Willy Tarreauf96508a2020-01-10 11:12:48 +0100211 struct wait_event *subs; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200212 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Willy Tarreau5723f292020-01-10 15:16:57 +0100213 struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to,
214 * in case there's no other subscription to do it */
Willy Tarreau18312642017-10-11 07:57:07 +0200215};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200216
Willy Tarreauc6405142017-09-21 20:23:50 +0200217/* descriptor for an h2 frame header */
218struct h2_fh {
219 uint32_t len; /* length, host order, 24 bits */
220 uint32_t sid; /* stream id, host order, 31 bits */
221 uint8_t ft; /* frame type */
222 uint8_t ff; /* frame flags */
223};
224
Willy Tarreau12ae2122019-08-08 18:23:12 +0200225/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200226static void h2_trace(enum trace_level level, uint64_t mask, \
227 const struct trace_source *src,
228 const struct ist where, const struct ist func,
229 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200230
231/* The event representation is split like this :
232 * strm - application layer
233 * h2s - internal H2 stream
234 * h2c - internal H2 connection
235 * conn - external connection
236 *
237 */
238static const struct trace_event h2_trace_events[] = {
239#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200240 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200241#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200242 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200243#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200244 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200245#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200246 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200247#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200248 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200249#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200250 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200251#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200252 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200253#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200254 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200255#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200256 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200257#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200258 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200259#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200260 { .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 +0200261#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200262 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200263#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200264 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200265#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200266 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200267#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200268 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200269#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200270 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200271#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200272 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200273#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200274 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200275#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200276 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200277#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200278 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200279#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200280 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200281#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200282 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200283#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200284 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200285#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200286 { .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 +0200287#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200288 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200289#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200290 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200291#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200292 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200293#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200294 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200295#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200296 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200297#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200298 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200299#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200300 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200301#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200302 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200303#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200304 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200305#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200306 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200307#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200308 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200309#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200310 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200311#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200312 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200313#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200314 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200315#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200316 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200317#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200318 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200319#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200320 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200321#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200322 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200323#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200324 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200325#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200326 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200327#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200328 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200329#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200330 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200331#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200332 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200333#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200334 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200335#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200336 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200337#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200338 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200339#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200340 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200341#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200342 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200343 { }
344};
345
346static const struct name_desc h2_trace_lockon_args[4] = {
347 /* arg1 */ { /* already used by the connection */ },
348 /* arg2 */ { .name="h2s", .desc="H2 stream" },
349 /* arg3 */ { },
350 /* arg4 */ { }
351};
352
353static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200354#define H2_VERB_CLEAN 1
355 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
356#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200357 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200358#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200359 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200360#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200361 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200362#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200363 { .name="complete", .desc="add full data dump when available" },
364 { /* end */ }
365};
366
367static struct trace_source trace_h2 = {
368 .name = IST("h2"),
369 .desc = "HTTP/2 multiplexer",
370 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200371 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200372 .known_events = h2_trace_events,
373 .lockon_args = h2_trace_lockon_args,
374 .decoding = h2_trace_decoding,
375 .report_events = ~0, // report everything by default
376};
377
378#define TRACE_SOURCE &trace_h2
379INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
380
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100381/* h2 stats module */
382enum {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100383 H2_ST_HEADERS_RCVD,
384 H2_ST_DATA_RCVD,
385 H2_ST_SETTINGS_RCVD,
386 H2_ST_RST_STREAM_RCVD,
387 H2_ST_GOAWAY_RCVD,
388
Amaury Denoyellea8879232020-10-27 17:16:03 +0100389 H2_ST_CONN_PROTO_ERR,
390 H2_ST_STRM_PROTO_ERR,
391 H2_ST_RST_STREAM_RESP,
392 H2_ST_GOAWAY_RESP,
393
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100394 H2_ST_OPEN_CONN,
395 H2_ST_OPEN_STREAM,
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100396 H2_ST_TOTAL_CONN,
397 H2_ST_TOTAL_STREAM,
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100398
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100399 H2_STATS_COUNT /* must be the last member of the enum */
400};
401
402static struct name_desc h2_stats[] = {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100403 [H2_ST_HEADERS_RCVD] = { .name = "h2_headers_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100404 .desc = "Total number of received HEADERS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100405 [H2_ST_DATA_RCVD] = { .name = "h2_data_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100406 .desc = "Total number of received DATA frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100407 [H2_ST_SETTINGS_RCVD] = { .name = "h2_settings_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100408 .desc = "Total number of received SETTINGS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100409 [H2_ST_RST_STREAM_RCVD] = { .name = "h2_rst_stream_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100410 .desc = "Total number of received RST_STREAM frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100411 [H2_ST_GOAWAY_RCVD] = { .name = "h2_goaway_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100412 .desc = "Total number of received GOAWAY frames" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100413
414 [H2_ST_CONN_PROTO_ERR] = { .name = "h2_detected_conn_protocol_errors",
415 .desc = "Total number of connection protocol errors" },
416 [H2_ST_STRM_PROTO_ERR] = { .name = "h2_detected_strm_protocol_errors",
417 .desc = "Total number of stream protocol errors" },
418 [H2_ST_RST_STREAM_RESP] = { .name = "h2_rst_stream_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100419 .desc = "Total number of RST_STREAM sent on detected error" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100420 [H2_ST_GOAWAY_RESP] = { .name = "h2_goaway_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100421 .desc = "Total number of GOAWAY sent on detected error" },
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100422
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100423 [H2_ST_OPEN_CONN] = { .name = "h2_open_connections",
424 .desc = "Count of currently open connections" },
425 [H2_ST_OPEN_STREAM] = { .name = "h2_backend_open_streams",
426 .desc = "Count of currently open streams" },
Amaury Denoyelle0ce4d012021-02-03 16:27:22 +0100427 [H2_ST_TOTAL_CONN] = { .name = "h2_total_connections",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100428 .desc = "Total number of connections" },
Amaury Denoyelle0ce4d012021-02-03 16:27:22 +0100429 [H2_ST_TOTAL_STREAM] = { .name = "h2_backend_total_streams",
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100430 .desc = "Total number of streams" },
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100431};
432
433static struct h2_counters {
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100434 long long headers_rcvd; /* total number of HEADERS frame received */
435 long long data_rcvd; /* total number of DATA frame received */
436 long long settings_rcvd; /* total number of SETTINGS frame received */
437 long long rst_stream_rcvd; /* total number of RST_STREAM frame received */
438 long long goaway_rcvd; /* total number of GOAWAY frame received */
Amaury Denoyellea8879232020-10-27 17:16:03 +0100439
440 long long conn_proto_err; /* total number of protocol errors detected */
441 long long strm_proto_err; /* total number of protocol errors detected */
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100442 long long rst_stream_resp; /* total number of RST_STREAM frame sent on error */
443 long long goaway_resp; /* total number of GOAWAY frame sent on error */
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100444
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100445 long long open_conns; /* count of currently open connections */
446 long long open_streams; /* count of currently open streams */
447 long long total_conns; /* total number of connections */
448 long long total_streams; /* total number of streams */
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100449} h2_counters;
450
451static void h2_fill_stats(void *data, struct field *stats)
452{
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100453 struct h2_counters *counters = data;
454
455 stats[H2_ST_HEADERS_RCVD] = mkf_u64(FN_COUNTER, counters->headers_rcvd);
456 stats[H2_ST_DATA_RCVD] = mkf_u64(FN_COUNTER, counters->data_rcvd);
457 stats[H2_ST_SETTINGS_RCVD] = mkf_u64(FN_COUNTER, counters->settings_rcvd);
458 stats[H2_ST_RST_STREAM_RCVD] = mkf_u64(FN_COUNTER, counters->rst_stream_rcvd);
459 stats[H2_ST_GOAWAY_RCVD] = mkf_u64(FN_COUNTER, counters->goaway_rcvd);
Amaury Denoyellea8879232020-10-27 17:16:03 +0100460
461 stats[H2_ST_CONN_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->conn_proto_err);
462 stats[H2_ST_STRM_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->strm_proto_err);
463 stats[H2_ST_RST_STREAM_RESP] = mkf_u64(FN_COUNTER, counters->rst_stream_resp);
464 stats[H2_ST_GOAWAY_RESP] = mkf_u64(FN_COUNTER, counters->goaway_resp);
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100465
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100466 stats[H2_ST_OPEN_CONN] = mkf_u64(FN_GAUGE, counters->open_conns);
467 stats[H2_ST_OPEN_STREAM] = mkf_u64(FN_GAUGE, counters->open_streams);
468 stats[H2_ST_TOTAL_CONN] = mkf_u64(FN_COUNTER, counters->total_conns);
469 stats[H2_ST_TOTAL_STREAM] = mkf_u64(FN_COUNTER, counters->total_streams);
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100470}
471
472static struct stats_module h2_stats_module = {
473 .name = "h2",
474 .fill_stats = h2_fill_stats,
475 .stats = h2_stats,
476 .stats_count = H2_STATS_COUNT,
477 .counters = &h2_counters,
478 .counters_size = sizeof(h2_counters),
479 .domain_flags = MK_STATS_PROXY_DOMAIN(STATS_PX_CAP_FE|STATS_PX_CAP_BE),
480 .clearable = 1,
481};
482
483INITCALL1(STG_REGISTER, stats_register_module, &h2_stats_module);
484
Willy Tarreau8ceae722018-11-26 11:58:30 +0100485/* the h2c connection pool */
486DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
487
488/* the h2s stream pool */
489DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
490
Willy Tarreaudc572362018-12-12 08:08:05 +0100491/* The default connection window size is 65535, it may only be enlarged using
492 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
493 * we'll pretend we already received the difference between the two to send
494 * an equivalent window update to enlarge it to 2G-1.
495 */
496#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
497
Willy Tarreau455d5682019-05-24 19:42:18 +0200498/* maximum amount of data we're OK with re-aligning for buffer optimizations */
499#define MAX_DATA_REALIGN 1024
500
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200501/* a few settings from the global section */
502static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200503static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100504static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100505static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200506
Willy Tarreau2a856182017-05-16 15:20:39 +0200507/* a dmumy closed stream */
508static const struct h2s *h2_closed_stream = &(const struct h2s){
509 .cs = NULL,
510 .h2c = NULL,
511 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100512 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100513 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200514 .id = 0,
515};
516
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100517/* a dmumy closed stream returning a PROTOCOL_ERROR error */
518static const struct h2s *h2_error_stream = &(const struct h2s){
519 .cs = NULL,
520 .h2c = NULL,
521 .st = H2_SS_CLOSED,
522 .errcode = H2_ERR_PROTOCOL_ERROR,
523 .flags = 0,
524 .id = 0,
525};
526
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100527/* a dmumy closed stream returning a REFUSED_STREAM error */
528static const struct h2s *h2_refused_stream = &(const struct h2s){
529 .cs = NULL,
530 .h2c = NULL,
531 .st = H2_SS_CLOSED,
532 .errcode = H2_ERR_REFUSED_STREAM,
533 .flags = 0,
534 .id = 0,
535};
536
Willy Tarreau2a856182017-05-16 15:20:39 +0200537/* and a dummy idle stream for use with any unannounced stream */
538static const struct h2s *h2_idle_stream = &(const struct h2s){
539 .cs = NULL,
540 .h2c = NULL,
541 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100542 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200543 .id = 0,
544};
545
Olivier Houchard9f6af332018-05-25 14:04:04 +0200546static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200547static int h2_send(struct h2c *h2c);
548static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200549static int h2_process(struct h2c *h2c);
Willy Tarreau9a5a0e02021-01-20 14:55:01 +0100550/* h2_io_cb is exported to see it resolved in "show fd" */
551struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100552static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100553static int h2c_decode_headers(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len);
Willy Tarreaua56a6de2018-02-26 15:59:07 +0100554static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200555static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100556static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100557static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200558
Willy Tarreauab2ec452019-08-30 07:07:08 +0200559/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
560static inline const char *h2c_st_to_str(enum h2_cs st)
561{
562 switch (st) {
563 case H2_CS_PREFACE: return "PRF";
564 case H2_CS_SETTINGS1: return "STG";
565 case H2_CS_FRAME_H: return "FRH";
566 case H2_CS_FRAME_P: return "FRP";
567 case H2_CS_FRAME_A: return "FRA";
568 case H2_CS_FRAME_E: return "FRE";
569 case H2_CS_ERROR: return "ERR";
570 case H2_CS_ERROR2: return "ER2";
571 default: return "???";
572 }
573}
574
575/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
576static inline const char *h2s_st_to_str(enum h2_ss st)
577{
578 switch (st) {
579 case H2_SS_IDLE: return "IDL"; // idle
580 case H2_SS_RLOC: return "RSL"; // reserved local
581 case H2_SS_RREM: return "RSR"; // reserved remote
582 case H2_SS_OPEN: return "OPN"; // open
583 case H2_SS_HREM: return "HCR"; // half-closed remote
584 case H2_SS_HLOC: return "HCL"; // half-closed local
585 case H2_SS_ERROR : return "ERR"; // error
586 case H2_SS_CLOSED: return "CLO"; // closed
587 default: return "???";
588 }
589}
590
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200591/* the H2 traces always expect that arg1, if non-null, is of type connection
592 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
593 * that arg3, if non-null, is either of type htx for tx headers, or of type
594 * buffer for everything else.
595 */
596static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
597 const struct ist where, const struct ist func,
598 const void *a1, const void *a2, const void *a3, const void *a4)
599{
600 const struct connection *conn = a1;
601 const struct h2c *h2c = conn ? conn->ctx : NULL;
602 const struct h2s *h2s = a2;
603 const struct buffer *buf = a3;
604 const struct htx *htx;
605 int pos;
606
607 if (!h2c) // nothing to add
608 return;
609
Willy Tarreau17104d42019-08-30 07:12:55 +0200610 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200611 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
612
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100613 if (h2c->errcode)
614 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode);
615
Willy Tarreau73db4342019-09-25 07:28:44 +0200616 if (h2c->dsi >= 0 &&
617 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
Willy Tarreau8520d872020-09-18 07:39:29 +0200618 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 +0200619 }
620
621 if (h2s) {
622 if (h2s->id <= 0)
623 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
624 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100625 if (h2s->id && h2s->errcode)
626 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode);
Willy Tarreau73db4342019-09-25 07:28:44 +0200627 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200628 }
629
630 /* Let's dump decoded requests and responses right after parsing. They
631 * are traced at level USER with a few recognizable flags.
632 */
633 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
634 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
635 htx = htxbuf(buf); // recv req/res
636 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
637 htx = a3; // send req/res
638 else
639 htx = NULL;
640
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200641 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200642 const struct htx_blk *blk = htx_get_blk(htx, pos);
643 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
644 enum htx_blk_type type = htx_get_blk_type(blk);
645
646 if (type == HTX_BLK_REQ_SL)
647 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200648 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200649 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
650 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
651 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
652 else if (type == HTX_BLK_RES_SL)
653 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200654 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200655 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
656 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
657 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
658 }
659}
660
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200661
Willy Tarreau1369ea22021-01-20 10:53:13 +0100662/* Detect a pending read0 for a H2 connection. It happens if a read0 was
663 * already reported on a previous xprt->rcvbuf() AND a frame parser failed
664 * to parse pending data, confirming no more progress is possible because
665 * we're facing a truncated frame. The function returns 1 to report a read0
666 * or 0 otherwise.
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200667 */
Willy Tarreau1369ea22021-01-20 10:53:13 +0100668static inline int h2c_read0_pending(struct h2c *h2c)
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200669{
Willy Tarreau1369ea22021-01-20 10:53:13 +0100670 return !!(h2c->flags & H2_CF_END_REACHED);
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200671}
672
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200673/* returns true if the connection is allowed to expire, false otherwise. A
674 * connection may expire when:
675 * - it has no stream
676 * - it has data in the mux buffer
677 * - it has streams in the blocked list
678 * - it has streams in the fctl list
679 * - it has streams in the send list
680 * Otherwise it means some streams are waiting in the data layer and it should
681 * not expire.
682 */
683static inline int h2c_may_expire(const struct h2c *h2c)
684{
685 return eb_is_empty(&h2c->streams_by_id) ||
686 br_data(h2c->mbuf) ||
687 !LIST_ISEMPTY(&h2c->blocked_list) ||
688 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100689 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200690}
691
Olivier Houchard7a977432019-03-21 15:47:13 +0100692static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200693h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100694{
695 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
696 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
697 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
698 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200699 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100700 (conn_xprt_read0_pending(h2c->conn) ||
701 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
702 return 1;
703
704 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100705}
706
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200707/*****************************************************/
708/* functions below are for dynamic buffer management */
709/*****************************************************/
710
Willy Tarreau315d8072017-12-10 22:17:57 +0100711/* indicates whether or not the we may call the h2_recv() function to attempt
712 * to receive data into the buffer and/or demux pending data. The condition is
713 * a bit complex due to some API limits for now. The rules are the following :
714 * - if an error or a shutdown was detected on the connection and the buffer
715 * is empty, we must not attempt to receive
716 * - if the demux buf failed to be allocated, we must not try to receive and
717 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100718 * - if no flag indicates a blocking condition, we may attempt to receive,
719 * regardless of whether the demux buffer is full or not, so that only
720 * de demux part decides whether or not to block. This is needed because
721 * the connection API indeed prevents us from re-enabling receipt that is
722 * already enabled in a polled state, so we must always immediately stop
723 * as soon as the demux can't proceed so as never to hit an end of read
724 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100725 * - otherwise must may not attempt
726 */
727static inline int h2_recv_allowed(const struct h2c *h2c)
728{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200729 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100730 (h2c->st0 >= H2_CS_ERROR ||
731 h2c->conn->flags & CO_FL_ERROR ||
732 conn_xprt_read0_pending(h2c->conn)))
733 return 0;
734
735 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100736 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100737 return 1;
738
739 return 0;
740}
741
Willy Tarreau47b515a2018-12-21 16:09:41 +0100742/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200743static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100744{
745 if (!h2_recv_allowed(h2c))
746 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200747 if ((!consider_buffer || !b_data(&h2c->dbuf))
748 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100749 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200750 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100751}
752
753
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100754/* returns true if the front connection has too many conn_streams attached */
755static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200756{
Willy Tarreaua8754662018-12-23 20:43:58 +0100757 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200758}
759
Willy Tarreau44e973f2018-03-01 17:49:30 +0100760/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
761 * flags are used to figure what buffer was requested. It returns 1 if the
762 * allocation succeeds, in which case the connection is woken up, or 0 if it's
763 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200764 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100765static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200766{
767 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100768 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200769
Willy Tarreau44e973f2018-03-01 17:49:30 +0100770 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200771 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200772 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200773 return 1;
774 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200775
Willy Tarreau51330962019-05-26 09:38:07 +0200776 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100777 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200778
779 if (h2c->flags & H2_CF_DEM_MROOM) {
780 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200781 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200782 }
Willy Tarreau14398122017-09-22 14:26:04 +0200783 return 1;
784 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100785
786 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
787 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200788 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100789 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200790 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100791 return 1;
792 }
793
Willy Tarreau14398122017-09-22 14:26:04 +0200794 return 0;
795}
796
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200797static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200798{
799 struct buffer *buf = NULL;
800
Willy Tarreau954827a2021-02-20 11:49:49 +0100801 if (likely(!LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100802 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
803 h2c->buf_wait.target = h2c;
804 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau954827a2021-02-20 11:49:49 +0100805 LIST_ADDQ(&ti->buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200806 }
807 return buf;
808}
809
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200810static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200811{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200812 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100813 b_free(bptr);
Willy Tarreau132b3a42021-02-20 12:02:46 +0100814 offer_buffers(NULL, 1);
Willy Tarreau14398122017-09-22 14:26:04 +0200815 }
816}
817
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200818static inline void h2_release_mbuf(struct h2c *h2c)
819{
820 struct buffer *buf;
821 unsigned int count = 0;
822
823 while (b_size(buf = br_head_pick(h2c->mbuf))) {
824 b_free(buf);
825 count++;
826 }
827 if (count)
Willy Tarreau132b3a42021-02-20 12:02:46 +0100828 offer_buffers(NULL, count);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200829}
830
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100831/* returns the number of allocatable outgoing streams for the connection taking
832 * the last_sid and the reserved ones into account.
833 */
834static inline int h2_streams_left(const struct h2c *h2c)
835{
836 int ret;
837
838 /* consider the number of outgoing streams we're allowed to create before
839 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
840 * nb_reserved is the number of streams which don't yet have an ID.
841 */
842 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
843 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
844 if (ret < 0)
845 ret = 0;
846 return ret;
847}
848
Willy Tarreau00f18a32019-01-26 12:19:01 +0100849/* returns the number of streams in use on a connection to figure if it's
850 * idle or not. We check nb_cs and not nb_streams as the caller will want
851 * to know if it was the last one after a detach().
852 */
853static int h2_used_streams(struct connection *conn)
854{
855 struct h2c *h2c = conn->ctx;
856
857 return h2c->nb_cs;
858}
859
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100860/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100861static int h2_avail_streams(struct connection *conn)
862{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100863 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100864 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100865 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100866
Willy Tarreau6afec462019-01-28 06:40:19 +0100867 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
868 * streams on the connection.
869 */
870 if (h2c->last_sid >= 0)
871 return 0;
872
Willy Tarreauc61966f2019-10-31 15:10:03 +0100873 if (h2c->st0 >= H2_CS_ERROR)
874 return 0;
875
Willy Tarreau86949782019-01-31 10:42:05 +0100876 /* note: may be negative if a SETTINGS frame changes the limit */
877 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100878
879 /* we must also consider the limit imposed by stream IDs */
880 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100881 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100882 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100883 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
884 ret1 = MIN(ret1, ret2);
885 }
886 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100887}
888
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200889
Willy Tarreau62f52692017-10-08 23:01:42 +0200890/*****************************************************************/
891/* functions below are dedicated to the mux setup and management */
892/*****************************************************************/
893
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200894/* Initialize the mux once it's attached. For outgoing connections, the context
895 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200896 * connections from the fact that the context is still NULL (even during mux
897 * upgrades). <input> is always used as Input buffer and may contain data. It is
898 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200899 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200900static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
901 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200902{
903 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100904 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200905 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200906
Christopher Fauletf81ef032019-10-04 15:19:43 +0200907 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200908
Willy Tarreaubafbe012017-11-24 17:34:44 +0100909 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200910 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200911 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200912
Christopher Faulete9b70722019-04-08 10:46:02 +0200913 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200914 h2c->flags = H2_CF_IS_BACK;
915 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
916 if (tick_isset(prx->timeout.serverfin))
917 h2c->shut_timeout = prx->timeout.serverfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100918
919 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be,
920 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200921 } else {
922 h2c->flags = H2_CF_NONE;
923 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
924 if (tick_isset(prx->timeout.clientfin))
925 h2c->shut_timeout = prx->timeout.clientfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100926
927 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe,
928 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200929 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100930
Willy Tarreau0b37d652018-10-03 10:33:02 +0200931 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100932 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100933 if (tick_isset(h2c->timeout)) {
934 t = task_new(tid_bit);
935 if (!t)
936 goto fail;
937
938 h2c->task = t;
939 t->process = h2_timeout_task;
940 t->context = h2c;
941 t->expire = tick_add(now_ms, h2c->timeout);
942 }
Willy Tarreauea392822017-10-31 10:02:25 +0100943
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200944 h2c->wait_event.tasklet = tasklet_new();
945 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200946 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200947 h2c->wait_event.tasklet->process = h2_io_cb;
948 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100949 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200950
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200951 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200952 if (!h2c->ddht)
953 goto fail;
954
955 /* Initialise the context. */
956 h2c->st0 = H2_CS_PREFACE;
957 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100958 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200959 h2c->max_id = -1;
960 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100961 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200962 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100963 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200964 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100965 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100966 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200967
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200968 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200969 h2c->dsi = -1;
970 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100971
Willy Tarreau32218eb2017-09-22 08:07:25 +0200972 h2c->last_sid = -1;
973
Willy Tarreau51330962019-05-26 09:38:07 +0200974 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200975 h2c->miw = 65535; /* mux initial window size */
976 h2c->mws = 65535; /* mux window size */
977 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200978 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200979 LIST_INIT(&h2c->send_list);
980 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200981 LIST_INIT(&h2c->blocked_list);
Willy Tarreau954827a2021-02-20 11:49:49 +0100982 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200983
Christopher Fauletf81ef032019-10-04 15:19:43 +0200984 conn->ctx = h2c;
985
Willy Tarreau3f133572017-10-31 19:21:06 +0100986 if (t)
987 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100988
Willy Tarreau01b44822018-10-03 14:26:37 +0200989 if (h2c->flags & H2_CF_IS_BACK) {
990 /* FIXME: this is temporary, for outgoing connections we need
991 * to immediately allocate a stream until the code is modified
992 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +0200993 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +0200994 */
995 struct h2s *h2s;
996
Christopher Fauletf81ef032019-10-04 15:19:43 +0200997 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200998 if (!h2s)
999 goto fail_stream;
1000 }
1001
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001002 HA_ATOMIC_ADD(&h2c->px_counters->open_conns, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001003 HA_ATOMIC_ADD(&h2c->px_counters->total_conns, 1);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001004
Willy Tarreau0f383582018-10-03 14:22:21 +02001005 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02001006 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001007 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001008 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +02001009 fail_stream:
1010 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +02001011 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +02001012 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001013 if (h2c->wait_event.tasklet)
1014 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +01001015 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +02001016 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +02001017 conn->ctx = conn_ctx; /* restore saved ctx */
1018 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001019 return -1;
1020}
1021
Willy Tarreau751f2d02018-10-05 09:35:00 +02001022/* returns the next allocatable outgoing stream ID for the H2 connection, or
1023 * -1 if no more is allocatable.
1024 */
1025static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
1026{
1027 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +01001028
1029 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +02001030 id = -1;
1031 return id;
1032}
1033
Willy Tarreau2373acc2017-10-12 17:35:14 +02001034/* returns the stream associated with id <id> or NULL if not found */
1035static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
1036{
1037 struct eb32_node *node;
1038
Willy Tarreau751f2d02018-10-05 09:35:00 +02001039 if (id == 0)
1040 return (struct h2s *)h2_closed_stream;
1041
Willy Tarreau2a856182017-05-16 15:20:39 +02001042 if (id > h2c->max_id)
1043 return (struct h2s *)h2_idle_stream;
1044
Willy Tarreau2373acc2017-10-12 17:35:14 +02001045 node = eb32_lookup(&h2c->streams_by_id, id);
1046 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +02001047 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +02001048
1049 return container_of(node, struct h2s, by_id);
1050}
1051
Christopher Faulet73c12072019-04-08 11:23:22 +02001052/* release function. This one should be called to free all resources allocated
1053 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +02001054 */
Christopher Faulet73c12072019-04-08 11:23:22 +02001055static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02001056{
William Dauchy477757c2020-08-07 22:19:23 +02001057 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001058
Willy Tarreau7838a792019-08-12 18:42:03 +02001059 TRACE_ENTER(H2_EV_H2C_END);
1060
Willy Tarreau32218eb2017-09-22 08:07:25 +02001061 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +02001062 /* The connection must be aattached to this mux to be released */
1063 if (h2c->conn && h2c->conn->ctx == h2c)
1064 conn = h2c->conn;
1065
Willy Tarreau7838a792019-08-12 18:42:03 +02001066 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001067 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +02001068
Willy Tarreau954827a2021-02-20 11:49:49 +01001069 if (LIST_ADDED(&h2c->buf_wait.list))
1070 LIST_DEL_INIT(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +02001071
Willy Tarreau44e973f2018-03-01 17:49:30 +01001072 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +02001073 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +01001074
Willy Tarreauea392822017-10-31 10:02:25 +01001075 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +02001076 h2c->task->context = NULL;
1077 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +01001078 h2c->task = NULL;
1079 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001080 if (h2c->wait_event.tasklet)
1081 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +02001082 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01001083 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +02001084 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +01001085
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001086 HA_ATOMIC_SUB(&h2c->px_counters->open_conns, 1);
1087
Willy Tarreaubafbe012017-11-24 17:34:44 +01001088 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001089 }
1090
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001091 if (conn) {
1092 conn->mux = NULL;
1093 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02001094 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001095
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001096 conn_stop_tracking(conn);
1097 conn_full_close(conn);
1098 if (conn->destroy_cb)
1099 conn->destroy_cb(conn);
1100 conn_free(conn);
1101 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001102
1103 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +02001104}
1105
1106
Willy Tarreau71681172017-10-23 14:39:06 +02001107/******************************************************/
1108/* functions below are for the H2 protocol processing */
1109/******************************************************/
1110
1111/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +01001112static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +02001113{
1114 return h2s ? h2s->id : 0;
1115}
1116
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001117/* returns the sum of the stream's own window size and the mux's initial
1118 * window, which together form the stream's effective window size.
1119 */
1120static inline int h2s_mws(const struct h2s *h2s)
1121{
1122 return h2s->sws + h2s->h2c->miw;
1123}
1124
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001125/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001126static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001127{
1128 if (h2c->msi < 0)
1129 return 0;
1130
1131 if (h2c->msi == h2s_id(h2s))
1132 return 0;
1133
1134 return 1;
1135}
1136
Willy Tarreau741d6df2017-10-17 08:00:59 +02001137/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001138static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001139{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001140 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001141 h2c->errcode = err;
1142 h2c->st0 = H2_CS_ERROR;
1143}
1144
Willy Tarreau175cebb2019-01-24 10:02:24 +01001145/* marks an error on the stream. It may also update an already closed stream
1146 * (e.g. to report an error after an RST was received).
1147 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001148static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001149{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001150 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001151 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001152 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001153 if (h2s->st < H2_SS_ERROR)
1154 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001155 if (h2s->cs)
1156 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001157 }
1158}
1159
Willy Tarreau7e094452018-12-19 18:08:52 +01001160/* attempt to notify the data layer of recv availability */
1161static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1162{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001163 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001164 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001165 tasklet_wakeup(h2s->subs->tasklet);
1166 h2s->subs->events &= ~SUB_RETRY_RECV;
1167 if (!h2s->subs->events)
1168 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001169 }
1170}
1171
1172/* attempt to notify the data layer of send availability */
1173static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1174{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001175 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001176 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001177 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001178 tasklet_wakeup(h2s->subs->tasklet);
1179 h2s->subs->events &= ~SUB_RETRY_SEND;
1180 if (!h2s->subs->events)
1181 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001182 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001183 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1184 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1185 tasklet_wakeup(h2s->shut_tl);
1186 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001187}
1188
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001189/* alerts the data layer, trying to wake it up by all means, following
1190 * this sequence :
1191 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1192 * - if its subscribed to send, then it's woken up for send
1193 * - if it was subscribed to neither, its ->wake() callback is called
1194 * It is safe to call this function with a closed stream which doesn't have a
1195 * conn_stream anymore.
1196 */
1197static void __maybe_unused h2s_alert(struct h2s *h2s)
1198{
Willy Tarreau7838a792019-08-12 18:42:03 +02001199 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1200
Willy Tarreauf96508a2020-01-10 11:12:48 +01001201 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001202 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001203 h2s_notify_recv(h2s);
1204 h2s_notify_send(h2s);
1205 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001206 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1207 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001208 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001209 }
1210
1211 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001212}
1213
Willy Tarreaue4820742017-07-27 13:37:23 +02001214/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001215static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001216{
1217 uint8_t *out = frame;
1218
1219 *out = len >> 16;
1220 write_n16(out + 1, len);
1221}
1222
Willy Tarreau54c15062017-10-10 17:10:03 +02001223/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1224 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1225 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001226 * available in the buffer's input prior to calling this function. The buffer
1227 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001228 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001229static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001230 const struct buffer *b, int o)
1231{
Willy Tarreau591d4452018-06-15 17:21:00 +02001232 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 +02001233}
1234
Willy Tarreau1f094672017-11-20 21:27:45 +01001235static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001236{
Willy Tarreau591d4452018-06-15 17:21:00 +02001237 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001238}
1239
Willy Tarreau1f094672017-11-20 21:27:45 +01001240static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001241{
Willy Tarreau591d4452018-06-15 17:21:00 +02001242 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001243}
1244
Willy Tarreau1f094672017-11-20 21:27:45 +01001245static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001246{
Willy Tarreau591d4452018-06-15 17:21:00 +02001247 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001248}
1249
1250
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001251/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1252 * The algorithm is not obvious. It turns out that H2 headers are neither
1253 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1254 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001255 *
1256 * b0 b1 b2 b3 b4 b5..b8
1257 * +----------+---------+--------+----+----+----------------------+
1258 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1259 * +----------+---------+--------+----+----+----------------------+
1260 *
1261 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1262 * we get the sid properly aligned and ordered, and 16 bits of len properly
1263 * ordered as well. The type and flags can be extracted using bit shifts from
1264 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001265 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1266 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001267 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001268static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001269{
1270 uint64_t w;
1271
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001272 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001273 return 0;
1274
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001275 w = h2_get_n64(b, o + 1);
1276 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001277 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1278 h->ff = w >> 32;
1279 h->ft = w >> 40;
1280 h->len += w >> 48;
1281 return 1;
1282}
1283
1284/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1285 * h2_peek_frame_hdr() above.
1286 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001287static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001288{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001289 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001290}
1291
1292/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001293static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001294{
1295 int ret;
1296
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001297 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001298 if (ret > 0)
1299 h2_skip_frame_hdr(b);
1300 return ret;
1301}
1302
Willy Tarreaucb985a42019-10-07 16:56:34 +02001303
1304/* try to fragment the headers frame present at the beginning of buffer <b>,
1305 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1306 * success. Typical causes of failure include a buffer not large enough to
1307 * add extra frame headers. The existing frame size is read in the current
1308 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1309 * and its length will be adjusted. The stream ID for continuation frames will
1310 * be copied from the initial frame's.
1311 */
1312static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1313{
1314 size_t remain = b->data - 9;
1315 int extra_frames = (remain - 1) / mfs;
1316 size_t fsize;
1317 char *fptr;
1318 int frame;
1319
1320 if (b->data <= mfs + 9)
1321 return 1;
1322
1323 /* Too large a frame, we need to fragment it using CONTINUATION
1324 * frames. We start from the end and move tails as needed.
1325 */
1326 if (b->data + extra_frames * 9 > b->size)
1327 return 0;
1328
1329 for (frame = extra_frames; frame; frame--) {
1330 fsize = ((remain - 1) % mfs) + 1;
1331 remain -= fsize;
1332
1333 /* move data */
1334 fptr = b->area + 9 + remain + (frame - 1) * 9;
1335 memmove(fptr + 9, b->area + 9 + remain, fsize);
1336 b->data += 9;
1337
1338 /* write new frame header */
1339 h2_set_frame_size(fptr, fsize);
1340 fptr[3] = H2_FT_CONTINUATION;
1341 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1342 write_n32(fptr + 5, read_n32(b->area + 5));
1343 }
1344
1345 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1346 h2_set_frame_size(b->area, remain);
1347 return 1;
1348}
1349
1350
Willy Tarreau00dd0782018-03-01 16:31:34 +01001351/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1352 * its connection if the stream was not yet closed. Please use this exclusively
1353 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001354 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001355static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001356{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001357 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001358 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001359 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001360 if (!h2s->id)
1361 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001362 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001363 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1364 h2s_notify_recv(h2s);
1365 }
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001366 HA_ATOMIC_SUB(&h2s->h2c->px_counters->open_streams, 1);
1367
Willy Tarreau7838a792019-08-12 18:42:03 +02001368 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001369 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001370 h2s->st = H2_SS_CLOSED;
1371}
1372
Willy Tarreau71049cc2018-03-28 13:56:39 +02001373/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001374/* h2s_destroy should only ever be called by the thread that owns the stream,
1375 * that means that a tasklet should be used if we want to destroy the h2s
1376 * from another thread
1377 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001378static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001379{
Willy Tarreau7838a792019-08-12 18:42:03 +02001380 struct connection *conn = h2s->h2c->conn;
1381
1382 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1383
Willy Tarreau0a10de62018-03-01 16:27:53 +01001384 h2s_close(h2s);
1385 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001386 if (b_size(&h2s->rxbuf)) {
1387 b_free(&h2s->rxbuf);
Willy Tarreau132b3a42021-02-20 12:02:46 +01001388 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02001389 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001390
1391 if (h2s->subs)
1392 h2s->subs->events = 0;
1393
Joseph Herlantd77575d2018-11-25 10:54:45 -08001394 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001395 * reference left would be in the h2c send_list/fctl_list, and if
1396 * we're in it, we're getting out anyway
1397 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001398 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001399
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001400 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001401 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001402 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001403
1404 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001405}
1406
Willy Tarreaua8e49542018-10-03 18:53:55 +02001407/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1408 * stream tree. In case of error, nothing is added and NULL is returned. The
1409 * causes of errors can be any failed memory allocation. The caller is
1410 * responsible for checking if the connection may support an extra stream
1411 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001412 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001413static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001414{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001415 struct h2s *h2s;
1416
Willy Tarreau7838a792019-08-12 18:42:03 +02001417 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1418
Willy Tarreaubafbe012017-11-24 17:34:44 +01001419 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001420 if (!h2s)
1421 goto out;
1422
Willy Tarreau5723f292020-01-10 15:16:57 +01001423 h2s->shut_tl = tasklet_new();
1424 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001425 pool_free(pool_head_h2s, h2s);
1426 goto out;
1427 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001428 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001429 h2s->shut_tl->process = h2_deferred_shut;
1430 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001431 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001432 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001433 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001434 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001435 h2s->flags = H2_SF_NONE;
1436 h2s->errcode = H2_ERR_NO_ERROR;
1437 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001438 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001439 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001440 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001441
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001442 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001443 if (id > 0)
1444 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001445 else
1446 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001447
1448 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001449 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001450 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001451
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001452 HA_ATOMIC_ADD(&h2c->px_counters->open_streams, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001453 HA_ATOMIC_ADD(&h2c->px_counters->total_streams, 1);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001454
Willy Tarreau7838a792019-08-12 18:42:03 +02001455 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001456 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001457 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001458 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001459 return NULL;
1460}
1461
1462/* creates a new stream <id> on the h2c connection and returns it, or NULL in
1463 * case of memory allocation error.
1464 */
1465static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
1466{
1467 struct session *sess = h2c->conn->owner;
1468 struct conn_stream *cs;
1469 struct h2s *h2s;
1470
Willy Tarreau7838a792019-08-12 18:42:03 +02001471 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1472
Willy Tarreaua8e49542018-10-03 18:53:55 +02001473 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1474 goto out;
1475
1476 h2s = h2s_new(h2c, id);
1477 if (!h2s)
1478 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001479
Christopher Faulet236c93b2020-07-02 09:19:54 +02001480 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001481 if (!cs)
1482 goto out_close;
1483
Olivier Houchard746fb772018-12-15 19:42:00 +01001484 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001485 h2s->cs = cs;
1486 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001487 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001488
1489 if (stream_create_from_cs(cs) < 0)
1490 goto out_free_cs;
1491
Willy Tarreau590a0512018-09-05 11:56:48 +02001492 /* We want the accept date presented to the next stream to be the one
1493 * we have now, the handshake time to be null (since the next stream
1494 * is not delayed by a handshake), and the idle time to count since
1495 * right now.
1496 */
1497 sess->accept_date = date;
1498 sess->tv_accept = now;
1499 sess->t_handshake = 0;
1500
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001501 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001502 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001503 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001504 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001505 return h2s;
1506
1507 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001508 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001509 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001510 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001511 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001512 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001513 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001514 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001515 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001516 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001517}
1518
Willy Tarreau751f2d02018-10-05 09:35:00 +02001519/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1520 * and returns it, or NULL in case of memory allocation error or if the highest
1521 * possible stream ID was reached.
1522 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001523static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001524{
1525 struct h2s *h2s = NULL;
1526
Willy Tarreau7838a792019-08-12 18:42:03 +02001527 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1528
Willy Tarreau86949782019-01-31 10:42:05 +01001529 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001530 goto out;
1531
Willy Tarreaua80dca82019-01-24 17:08:28 +01001532 if (h2_streams_left(h2c) < 1)
1533 goto out;
1534
Willy Tarreau751f2d02018-10-05 09:35:00 +02001535 /* Defer choosing the ID until we send the first message to create the stream */
1536 h2s = h2s_new(h2c, 0);
1537 if (!h2s)
1538 goto out;
1539
1540 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001541 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001542 cs->ctx = h2s;
1543 h2c->nb_cs++;
1544
Willy Tarreau751f2d02018-10-05 09:35:00 +02001545 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001546 if (likely(h2s))
1547 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1548 else
1549 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001550 return h2s;
1551}
1552
Willy Tarreaube5b7152017-09-25 16:25:39 +02001553/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1554 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1555 * the various settings codes.
1556 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001557static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001558{
1559 struct buffer *res;
1560 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001561 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001562 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001563 int ret = 0;
1564
1565 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001566
1567 if (h2c_mux_busy(h2c, NULL)) {
1568 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001569 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001570 }
1571
Willy Tarreaube5b7152017-09-25 16:25:39 +02001572 chunk_init(&buf, buf_data, sizeof(buf_data));
1573 chunk_memcpy(&buf,
1574 "\x00\x00\x00" /* length : 0 for now */
1575 "\x04\x00" /* type : 4 (settings), flags : 0 */
1576 "\x00\x00\x00\x00", /* stream ID : 0 */
1577 9);
1578
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001579 if (h2c->flags & H2_CF_IS_BACK) {
1580 /* send settings_enable_push=0 */
1581 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1582 }
1583
Willy Tarreaube5b7152017-09-25 16:25:39 +02001584 if (h2_settings_header_table_size != 4096) {
1585 char str[6] = "\x00\x01"; /* header_table_size */
1586
1587 write_n32(str + 2, h2_settings_header_table_size);
1588 chunk_memcat(&buf, str, 6);
1589 }
1590
1591 if (h2_settings_initial_window_size != 65535) {
1592 char str[6] = "\x00\x04"; /* initial_window_size */
1593
1594 write_n32(str + 2, h2_settings_initial_window_size);
1595 chunk_memcat(&buf, str, 6);
1596 }
1597
1598 if (h2_settings_max_concurrent_streams != 0) {
1599 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1600
1601 /* Note: 0 means "unlimited" for haproxy's config but not for
1602 * the protocol, so never send this value!
1603 */
1604 write_n32(str + 2, h2_settings_max_concurrent_streams);
1605 chunk_memcat(&buf, str, 6);
1606 }
1607
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001608 mfs = h2_settings_max_frame_size;
1609 if (mfs > global.tune.bufsize)
1610 mfs = global.tune.bufsize;
1611
1612 if (!mfs)
1613 mfs = global.tune.bufsize;
1614
1615 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001616 char str[6] = "\x00\x05"; /* max_frame_size */
1617
1618 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1619 * match bufsize - rewrite size, but at the moment it seems
1620 * that clients don't take care of it.
1621 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001622 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001623 chunk_memcat(&buf, str, 6);
1624 }
1625
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001626 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001627
1628 res = br_tail(h2c->mbuf);
1629 retry:
1630 if (!h2_get_buf(h2c, res)) {
1631 h2c->flags |= H2_CF_MUX_MALLOC;
1632 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001633 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001634 }
1635
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001636 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001637 if (unlikely(ret <= 0)) {
1638 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001639 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1640 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001641 h2c->flags |= H2_CF_MUX_MFULL;
1642 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001643 }
1644 else {
1645 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001646 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001647 }
1648 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001649 out:
1650 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001651 return ret;
1652}
1653
Willy Tarreau52eed752017-09-22 15:05:09 +02001654/* Try to receive a connection preface, then upon success try to send our
1655 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1656 * missing data. It may return an error in h2c.
1657 */
1658static int h2c_frt_recv_preface(struct h2c *h2c)
1659{
1660 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001661 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001662
Willy Tarreau7838a792019-08-12 18:42:03 +02001663 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1664
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001665 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001666
1667 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001668 if (ret1 < 0)
1669 sess_log(h2c->conn->owner);
1670
Amaury Denoyellea8879232020-10-27 17:16:03 +01001671 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn)) {
Willy Tarreau52eed752017-09-22 15:05:09 +02001672 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01001673 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
1674 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001675 ret2 = 0;
1676 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001677 }
1678
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001679 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001680 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001681 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001682 out:
1683 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001684 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001685}
1686
Willy Tarreau01b44822018-10-03 14:26:37 +02001687/* Try to send a connection preface, then upon success try to send our
1688 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1689 * missing data. It may return an error in h2c.
1690 */
1691static int h2c_bck_send_preface(struct h2c *h2c)
1692{
1693 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001694 int ret = 0;
1695
1696 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001697
1698 if (h2c_mux_busy(h2c, NULL)) {
1699 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001700 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001701 }
1702
Willy Tarreaubcc45952019-05-26 10:05:50 +02001703 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001704 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001705 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001706 h2c->flags |= H2_CF_MUX_MALLOC;
1707 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001708 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001709 }
1710
1711 if (!b_data(res)) {
1712 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001713 ret = b_istput(res, ist(H2_CONN_PREFACE));
1714 if (unlikely(ret <= 0)) {
1715 if (!ret) {
1716 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1717 goto retry;
1718 h2c->flags |= H2_CF_MUX_MFULL;
1719 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001720 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001721 }
1722 else {
1723 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001724 ret = 0;
1725 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001726 }
1727 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001728 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001729 ret = h2c_send_settings(h2c);
1730 out:
1731 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1732 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001733}
1734
Willy Tarreau081d4722017-05-16 21:51:05 +02001735/* try to send a GOAWAY frame on the connection to report an error or a graceful
1736 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1737 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1738 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1739 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1740 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1741 * on unrecoverable failure. It will not attempt to send one again in this last
1742 * case so that it is safe to use h2c_error() to report such errors.
1743 */
1744static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1745{
1746 struct buffer *res;
1747 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001748 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001749
Willy Tarreau7838a792019-08-12 18:42:03 +02001750 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1751
1752 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1753 ret = 1; // claim that it worked
1754 goto out;
1755 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001756
1757 if (h2c_mux_busy(h2c, h2s)) {
1758 if (h2s)
1759 h2s->flags |= H2_SF_BLK_MBUSY;
1760 else
1761 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001762 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001763 }
1764
Willy Tarreau9c218e72019-05-26 10:08:28 +02001765 /* len: 8, type: 7, flags: none, sid: 0 */
1766 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1767
1768 if (h2c->last_sid < 0)
1769 h2c->last_sid = h2c->max_id;
1770
1771 write_n32(str + 9, h2c->last_sid);
1772 write_n32(str + 13, h2c->errcode);
1773
Willy Tarreaubcc45952019-05-26 10:05:50 +02001774 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001775 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001776 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001777 h2c->flags |= H2_CF_MUX_MALLOC;
1778 if (h2s)
1779 h2s->flags |= H2_SF_BLK_MROOM;
1780 else
1781 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001782 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001783 }
1784
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001785 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001786 if (unlikely(ret <= 0)) {
1787 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001788 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1789 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001790 h2c->flags |= H2_CF_MUX_MFULL;
1791 if (h2s)
1792 h2s->flags |= H2_SF_BLK_MROOM;
1793 else
1794 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001795 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001796 }
1797 else {
1798 /* we cannot report this error using GOAWAY, so we mark
1799 * it and claim a success.
1800 */
1801 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1802 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001803 ret = 1;
1804 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001805 }
1806 }
1807 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreaue4078ca2020-12-01 10:47:18 +01001808
1809 /* some codes are not for real errors, just attempts to close cleanly */
1810 switch (h2c->errcode) {
1811 case H2_ERR_NO_ERROR:
1812 case H2_ERR_ENHANCE_YOUR_CALM:
1813 case H2_ERR_REFUSED_STREAM:
1814 case H2_ERR_CANCEL:
1815 break;
1816 default:
1817 HA_ATOMIC_ADD(&h2c->px_counters->goaway_resp, 1);
1818 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001819 out:
1820 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001821 return ret;
1822}
1823
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001824/* Try to send an RST_STREAM frame on the connection for the indicated stream
1825 * during mux operations. This stream must be valid and cannot be closed
1826 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1827 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1828 * not yet.
1829 *
1830 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1831 * to write the message, it subscribes the stream to future notifications.
1832 */
1833static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1834{
1835 struct buffer *res;
1836 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001837 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001838
Willy Tarreau7838a792019-08-12 18:42:03 +02001839 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1840
1841 if (!h2s || h2s->st == H2_SS_CLOSED) {
1842 ret = 1;
1843 goto out;
1844 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001845
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001846 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1847 * RST_STREAM in response to a RST_STREAM frame.
1848 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001849 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001850 ret = 1;
1851 goto ignore;
1852 }
1853
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001854 if (h2c_mux_busy(h2c, h2s)) {
1855 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001856 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001857 }
1858
Willy Tarreau9c218e72019-05-26 10:08:28 +02001859 /* len: 4, type: 3, flags: none */
1860 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1861 write_n32(str + 5, h2s->id);
1862 write_n32(str + 9, h2s->errcode);
1863
Willy Tarreaubcc45952019-05-26 10:05:50 +02001864 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001865 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001866 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001867 h2c->flags |= H2_CF_MUX_MALLOC;
1868 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001869 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001870 }
1871
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001872 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001873 if (unlikely(ret <= 0)) {
1874 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001875 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1876 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001877 h2c->flags |= H2_CF_MUX_MFULL;
1878 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001879 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001880 }
1881 else {
1882 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001883 ret = 0;
1884 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001885 }
1886 }
1887
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001888 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001889 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001890 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001891 out:
1892 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001893 return ret;
1894}
1895
1896/* Try to send an RST_STREAM frame on the connection for the stream being
1897 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001898 * error code, even if the stream is one of the dummy ones, and will update
1899 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001900 *
1901 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1902 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001903 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001904 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001905 */
1906static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1907{
1908 struct buffer *res;
1909 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001910 int ret = 0;
1911
1912 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001913
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001914 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1915 * RST_STREAM in response to a RST_STREAM frame.
1916 */
1917 if (h2c->dft == H2_FT_RST_STREAM) {
1918 ret = 1;
1919 goto ignore;
1920 }
1921
Willy Tarreau27a84c92017-10-17 08:10:17 +02001922 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001923 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001924 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001925 }
1926
Willy Tarreau9c218e72019-05-26 10:08:28 +02001927 /* len: 4, type: 3, flags: none */
1928 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1929
1930 write_n32(str + 5, h2c->dsi);
1931 write_n32(str + 9, h2s->errcode);
1932
Willy Tarreaubcc45952019-05-26 10:05:50 +02001933 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001934 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001935 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001936 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001937 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001938 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001939 }
1940
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001941 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001942 if (unlikely(ret <= 0)) {
1943 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001944 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1945 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001946 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001947 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001948 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001949 }
1950 else {
1951 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001952 ret = 0;
1953 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001954 }
1955 }
1956
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001957 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001958 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001959 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001960 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001961 }
1962
Willy Tarreau7838a792019-08-12 18:42:03 +02001963 out:
Amaury Denoyellea8879232020-10-27 17:16:03 +01001964 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_resp, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001965 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001966 return ret;
1967}
1968
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001969/* try to send an empty DATA frame with the ES flag set to notify about the
1970 * end of stream and match a shutdown(write). If an ES was already sent as
1971 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1972 * on success or zero if nothing was done. In case of lack of room to write the
1973 * message, it subscribes the requesting stream to future notifications.
1974 */
1975static int h2_send_empty_data_es(struct h2s *h2s)
1976{
1977 struct h2c *h2c = h2s->h2c;
1978 struct buffer *res;
1979 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001980 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001981
Willy Tarreau7838a792019-08-12 18:42:03 +02001982 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1983
1984 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1985 ret = 1;
1986 goto out;
1987 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001988
1989 if (h2c_mux_busy(h2c, h2s)) {
1990 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001991 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001992 }
1993
Willy Tarreau9c218e72019-05-26 10:08:28 +02001994 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1995 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1996 write_n32(str + 5, h2s->id);
1997
Willy Tarreaubcc45952019-05-26 10:05:50 +02001998 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001999 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002000 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002001 h2c->flags |= H2_CF_MUX_MALLOC;
2002 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002003 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002004 }
2005
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002006 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002007 if (likely(ret > 0)) {
2008 h2s->flags |= H2_SF_ES_SENT;
2009 }
2010 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002011 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2012 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002013 h2c->flags |= H2_CF_MUX_MFULL;
2014 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002015 }
2016 else {
2017 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002018 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002019 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002020 out:
2021 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002022 return ret;
2023}
2024
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002025/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002026 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002027 * is automatically updated accordingly. If the stream is orphaned, it is
2028 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01002029 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002030static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01002031{
Willy Tarreau7838a792019-08-12 18:42:03 +02002032 struct h2c *h2c = h2s->h2c;
2033
2034 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
2035
Christopher Fauletf02ca002019-03-07 16:21:34 +01002036 if (!h2s->cs) {
2037 /* this stream was already orphaned */
2038 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002039 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002040 return;
2041 }
2042
Christopher Fauletaade4ed2020-10-08 15:38:41 +02002043 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002044 if (h2s->st == H2_SS_OPEN)
2045 h2s->st = H2_SS_HREM;
2046 else if (h2s->st == H2_SS_HLOC)
2047 h2s_close(h2s);
2048 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002049
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002050 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
2051 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
2052 h2s->cs->flags |= CS_FL_ERR_PENDING;
2053 if (h2s->cs->flags & CS_FL_EOS)
2054 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02002055
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002056 if (h2s->st < H2_SS_ERROR)
2057 h2s->st = H2_SS_ERROR;
2058 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01002059
2060 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002061 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002062}
2063
2064/* wake the streams attached to the connection, whose id is greater than <last>
2065 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002066 */
Willy Tarreau23482912019-05-07 15:23:14 +02002067static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002068{
2069 struct eb32_node *node;
2070 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002071
Willy Tarreau7838a792019-08-12 18:42:03 +02002072 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
2073
Christopher Fauletf02ca002019-03-07 16:21:34 +01002074 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002075 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
2076 while (node) {
2077 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002078 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002079 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002080 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01002081
Christopher Fauletf02ca002019-03-07 16:21:34 +01002082 /* Wake all streams with unassigned ID (ID == 0) */
2083 node = eb32_lookup(&h2c->streams_by_id, 0);
2084 while (node) {
2085 h2s = container_of(node, struct h2s, by_id);
2086 if (h2s->id > 0)
2087 break;
2088 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002089 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002090 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002091
2092 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002093}
2094
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002095/* Wake up all blocked streams whose window size has become positive after the
2096 * mux's initial window was adjusted. This should be done after having processed
2097 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002098 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002099static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02002100{
2101 struct h2s *h2s;
2102 struct eb32_node *node;
2103
Willy Tarreau7838a792019-08-12 18:42:03 +02002104 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2105
Willy Tarreau3421aba2017-07-27 15:41:03 +02002106 node = eb32_first(&h2c->streams_by_id);
2107 while (node) {
2108 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002109 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002110 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002111 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002112 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2113 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002114 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002115 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002116 node = eb32_next(node);
2117 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002118
2119 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002120}
2121
2122/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
2123 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01002124 * return an error in h2c. The caller must have already verified frame length
2125 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002126 */
2127static int h2c_handle_settings(struct h2c *h2c)
2128{
2129 unsigned int offset;
2130 int error;
2131
Willy Tarreau7838a792019-08-12 18:42:03 +02002132 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2133
Willy Tarreau3421aba2017-07-27 15:41:03 +02002134 if (h2c->dff & H2_F_SETTINGS_ACK) {
2135 if (h2c->dfl) {
2136 error = H2_ERR_FRAME_SIZE_ERROR;
2137 goto fail;
2138 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002139 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002140 }
2141
Willy Tarreau3421aba2017-07-27 15:41:03 +02002142 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002143 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002144 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002145
2146 /* parse the frame */
2147 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002148 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2149 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002150
2151 switch (type) {
2152 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2153 /* we need to update all existing streams with the
2154 * difference from the previous iws.
2155 */
2156 if (arg < 0) { // RFC7540#6.5.2
2157 error = H2_ERR_FLOW_CONTROL_ERROR;
2158 goto fail;
2159 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002160 h2c->miw = arg;
2161 break;
2162 case H2_SETTINGS_MAX_FRAME_SIZE:
2163 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
2164 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002165 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002166 goto fail;
2167 }
2168 h2c->mfs = arg;
2169 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002170 case H2_SETTINGS_ENABLE_PUSH:
2171 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
2172 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002173 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002174 goto fail;
2175 }
2176 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002177 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2178 if (h2c->flags & H2_CF_IS_BACK) {
2179 /* the limit is only for the backend; for the frontend it is our limit */
2180 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2181 arg = h2_settings_max_concurrent_streams;
2182 h2c->streams_limit = arg;
2183 }
2184 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002185 }
2186 }
2187
2188 /* need to ACK this frame now */
2189 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002190 done:
2191 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002192 return 1;
2193 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002194 if (!(h2c->flags & H2_CF_IS_BACK))
2195 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002196 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002197 out0:
2198 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 +02002199 return 0;
2200}
2201
2202/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2203 * success or one of the h2_status values.
2204 */
2205static int h2c_ack_settings(struct h2c *h2c)
2206{
2207 struct buffer *res;
2208 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002209 int ret = 0;
2210
2211 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002212
2213 if (h2c_mux_busy(h2c, NULL)) {
2214 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002215 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002216 }
2217
Willy Tarreau9c218e72019-05-26 10:08:28 +02002218 memcpy(str,
2219 "\x00\x00\x00" /* length : 0 (no data) */
2220 "\x04" "\x01" /* type : 4, flags : ACK */
2221 "\x00\x00\x00\x00" /* stream ID */, 9);
2222
Willy Tarreaubcc45952019-05-26 10:05:50 +02002223 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002224 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002225 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002226 h2c->flags |= H2_CF_MUX_MALLOC;
2227 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002228 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002229 }
2230
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002231 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002232 if (unlikely(ret <= 0)) {
2233 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002234 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2235 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002236 h2c->flags |= H2_CF_MUX_MFULL;
2237 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002238 }
2239 else {
2240 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002241 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002242 }
2243 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002244 out:
2245 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002246 return ret;
2247}
2248
Willy Tarreaucf68c782017-10-10 17:11:41 +02002249/* processes a PING frame and schedules an ACK if needed. The caller must pass
2250 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002251 * missing data. The caller must have already verified frame length
2252 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002253 */
2254static int h2c_handle_ping(struct h2c *h2c)
2255{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002256 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002257 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002258 h2c->st0 = H2_CS_FRAME_A;
2259 return 1;
2260}
2261
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002262/* Try to send a window update for stream id <sid> and value <increment>.
2263 * Returns > 0 on success or zero on missing room or failure. It may return an
2264 * error in h2c.
2265 */
2266static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2267{
2268 struct buffer *res;
2269 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002270 int ret = 0;
2271
2272 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002273
2274 if (h2c_mux_busy(h2c, NULL)) {
2275 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002276 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002277 }
2278
Willy Tarreau9c218e72019-05-26 10:08:28 +02002279 /* length: 4, type: 8, flags: none */
2280 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2281 write_n32(str + 5, sid);
2282 write_n32(str + 9, increment);
2283
Willy Tarreaubcc45952019-05-26 10:05:50 +02002284 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002285 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002286 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002287 h2c->flags |= H2_CF_MUX_MALLOC;
2288 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002289 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002290 }
2291
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002292 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002293 if (unlikely(ret <= 0)) {
2294 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002295 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2296 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002297 h2c->flags |= H2_CF_MUX_MFULL;
2298 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002299 }
2300 else {
2301 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002302 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002303 }
2304 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002305 out:
2306 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002307 return ret;
2308}
2309
2310/* try to send pending window update for the connection. It's safe to call it
2311 * with no pending updates. Returns > 0 on success or zero on missing room or
2312 * failure. It may return an error in h2c.
2313 */
2314static int h2c_send_conn_wu(struct h2c *h2c)
2315{
2316 int ret = 1;
2317
Willy Tarreau7838a792019-08-12 18:42:03 +02002318 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2319
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002320 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002321 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002322
Willy Tarreau97aaa672018-12-23 09:49:04 +01002323 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2324 /* increase the advertised connection window to 2G on
2325 * first update.
2326 */
2327 h2c->flags |= H2_CF_WINDOW_OPENED;
2328 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2329 }
2330
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002331 /* send WU for the connection */
2332 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2333 if (ret > 0)
2334 h2c->rcvd_c = 0;
2335
Willy Tarreau7838a792019-08-12 18:42:03 +02002336 out:
2337 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002338 return ret;
2339}
2340
2341/* try to send pending window update for the current dmux stream. It's safe to
2342 * call it with no pending updates. Returns > 0 on success or zero on missing
2343 * room or failure. It may return an error in h2c.
2344 */
2345static int h2c_send_strm_wu(struct h2c *h2c)
2346{
2347 int ret = 1;
2348
Willy Tarreau7838a792019-08-12 18:42:03 +02002349 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2350
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002351 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002352 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002353
2354 /* send WU for the stream */
2355 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2356 if (ret > 0)
2357 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002358 out:
2359 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002360 return ret;
2361}
2362
Willy Tarreaucf68c782017-10-10 17:11:41 +02002363/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2364 * success, 0 on missing data or one of the h2_status values.
2365 */
2366static int h2c_ack_ping(struct h2c *h2c)
2367{
2368 struct buffer *res;
2369 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002370 int ret = 0;
2371
2372 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002373
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002374 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002375 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002376
2377 if (h2c_mux_busy(h2c, NULL)) {
2378 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002379 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002380 }
2381
Willy Tarreaucf68c782017-10-10 17:11:41 +02002382 memcpy(str,
2383 "\x00\x00\x08" /* length : 8 (same payload) */
2384 "\x06" "\x01" /* type : 6, flags : ACK */
2385 "\x00\x00\x00\x00" /* stream ID */, 9);
2386
2387 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002388 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002389
Willy Tarreau9c218e72019-05-26 10:08:28 +02002390 res = br_tail(h2c->mbuf);
2391 retry:
2392 if (!h2_get_buf(h2c, res)) {
2393 h2c->flags |= H2_CF_MUX_MALLOC;
2394 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002395 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002396 }
2397
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002398 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002399 if (unlikely(ret <= 0)) {
2400 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002401 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2402 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002403 h2c->flags |= H2_CF_MUX_MFULL;
2404 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002405 }
2406 else {
2407 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002408 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002409 }
2410 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002411 out:
2412 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002413 return ret;
2414}
2415
Willy Tarreau26f95952017-07-27 17:18:30 +02002416/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2417 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002418 * h2c or h2s. The caller must have already verified frame length and stream ID
2419 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002420 */
2421static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2422{
2423 int32_t inc;
2424 int error;
2425
Willy Tarreau7838a792019-08-12 18:42:03 +02002426 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2427
Willy Tarreau26f95952017-07-27 17:18:30 +02002428 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002429 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002430 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002431
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002432 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002433
2434 if (h2c->dsi != 0) {
2435 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002436
2437 /* it's not an error to receive WU on a closed stream */
2438 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002439 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002440
2441 if (!inc) {
2442 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002443 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002444 goto strm_err;
2445 }
2446
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002447 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002448 error = H2_ERR_FLOW_CONTROL_ERROR;
Willy Tarreauef8b8642020-12-01 10:22:43 +01002449 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002450 goto strm_err;
2451 }
2452
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002453 h2s->sws += inc;
2454 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002455 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002456 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002457 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2458 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Olivier Houcharddddfe312018-10-10 18:51:00 +02002459 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002460 }
2461 }
2462 else {
2463 /* connection window update */
2464 if (!inc) {
2465 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002466 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002467 goto conn_err;
2468 }
2469
2470 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2471 error = H2_ERR_FLOW_CONTROL_ERROR;
2472 goto conn_err;
2473 }
2474
2475 h2c->mws += inc;
2476 }
2477
Willy Tarreau7838a792019-08-12 18:42:03 +02002478 done:
2479 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002480 return 1;
2481
2482 conn_err:
2483 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002484 out0:
2485 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 +02002486 return 0;
2487
2488 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002489 h2s_error(h2s, error);
2490 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002491 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002492 return 0;
2493}
2494
Willy Tarreaue96b0922017-10-30 00:28:29 +01002495/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002496 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2497 * have already verified frame length and stream ID validity. Described in
2498 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002499 */
2500static int h2c_handle_goaway(struct h2c *h2c)
2501{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002502 int last;
2503
Willy Tarreau7838a792019-08-12 18:42:03 +02002504 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002505 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002506 if (b_data(&h2c->dbuf) < h2c->dfl) {
2507 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002508 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002509 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002510
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002511 last = h2_get_n32(&h2c->dbuf, 0);
2512 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002513 if (h2c->last_sid < 0)
2514 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002515 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002516 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002517 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002518}
2519
Willy Tarreau92153fc2017-12-03 19:46:19 +01002520/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002521 * invalid. Returns > 0 on success or zero on missing data. It may return an
2522 * error in h2c. The caller must have already verified frame length and stream
2523 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002524 */
2525static int h2c_handle_priority(struct h2c *h2c)
2526{
Willy Tarreau7838a792019-08-12 18:42:03 +02002527 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2528
Willy Tarreau92153fc2017-12-03 19:46:19 +01002529 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002530 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002531 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002532 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002533 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002534
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002535 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002536 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01002537 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01002538 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002539 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002540 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002541 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002542 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002543 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002544}
2545
Willy Tarreaucd234e92017-08-18 10:59:39 +02002546/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002547 * Returns > 0 on success or zero on missing data. The caller must have already
2548 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002549 */
2550static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2551{
Willy Tarreau7838a792019-08-12 18:42:03 +02002552 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2553
Willy Tarreaucd234e92017-08-18 10:59:39 +02002554 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002555 if (b_data(&h2c->dbuf) < h2c->dfl) {
2556 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 +02002557 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002558 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002559
2560 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002561 if (h2s->st == H2_SS_CLOSED) {
2562 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 +02002563 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002564 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002565
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002566 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002567 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002568
2569 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002570 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002571 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002572 }
2573
2574 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002575 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002576 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002577}
2578
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002579/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2580 * It may return an error in h2c or h2s. The caller must consider that the
2581 * return value is the new h2s in case one was allocated (most common case).
2582 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002583 * errors here are reported as connection errors since it's impossible to
2584 * recover from such errors after the compression context has been altered.
2585 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002586static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002587{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002588 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002589 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002590 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002591 int error;
2592
Willy Tarreau7838a792019-08-12 18:42:03 +02002593 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2594
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002595 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002596 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002597
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002598 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002599 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002600
2601 /* now either the frame is complete or the buffer is complete */
2602 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002603 /* The stream exists/existed, this must be a trailers frame */
2604 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002605 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2606 /* unrecoverable error ? */
2607 if (h2c->st0 >= H2_CS_ERROR)
2608 goto out;
2609
2610 if (error == 0)
2611 goto out; // missing data
2612
2613 if (error < 0) {
2614 /* Failed to decode this frame (e.g. too large request)
2615 * but the HPACK decompressor is still synchronized.
2616 */
2617 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2618 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002619 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002620 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002621 goto done;
2622 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002623 /* the connection was already killed by an RST, let's consume
2624 * the data and send another RST.
2625 */
2626 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2627 h2s = (struct h2s*)h2_error_stream;
2628 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002629 }
2630 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2631 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2632 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002633 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002634 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002635 goto conn_err;
2636 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002637 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2638 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002639
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002640 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002641
Willy Tarreau25919232019-01-03 14:48:18 +01002642 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002643 if (h2c->st0 >= H2_CS_ERROR)
2644 goto out;
2645
Willy Tarreau25919232019-01-03 14:48:18 +01002646 if (error <= 0) {
2647 if (error == 0)
2648 goto out; // missing data
2649
2650 /* Failed to decode this stream (e.g. too large request)
2651 * but the HPACK decompressor is still synchronized.
2652 */
2653 h2s = (struct h2s*)h2_error_stream;
2654 goto send_rst;
2655 }
2656
Willy Tarreau22de8d32018-09-05 19:55:58 +02002657 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002658 * positively from h2c_frt_stream_new(), the stream will report the error,
2659 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002660 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002661 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002662 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002663 h2s = (struct h2s*)h2_refused_stream;
2664 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002665 }
2666
2667 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002668 h2s->rxbuf = rxbuf;
2669 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002670 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002671
Willy Tarreau88d138e2019-01-02 19:38:14 +01002672 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002673 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002674 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002675
2676 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002677 if (h2s->st == H2_SS_OPEN)
2678 h2s->st = H2_SS_HREM;
2679 else
2680 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002681 }
2682
Willy Tarreau3a429f02019-01-03 11:41:50 +01002683 /* update the max stream ID if the request is being processed */
2684 if (h2s->id > h2c->max_id)
2685 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002686
Willy Tarreau022e5e52020-09-10 09:33:15 +02002687 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 +01002688 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002689
2690 conn_err:
2691 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002692 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002693
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002694 out:
2695 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002696 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 +01002697 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002698
2699 send_rst:
2700 /* make the demux send an RST for the current stream. We may only
2701 * do this if we're certain that the HEADERS frame was properly
2702 * decompressed so that the HPACK decoder is still kept up to date.
2703 */
2704 h2_release_buf(h2c, &rxbuf);
2705 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002706
Willy Tarreau022e5e52020-09-10 09:33:15 +02002707 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 +02002708 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002709 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002710}
2711
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002712/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2713 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2714 * errors here are reported as connection errors since it's impossible to
2715 * recover from such errors after the compression context has been altered.
2716 */
2717static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2718{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002719 struct buffer rxbuf = BUF_NULL;
2720 unsigned long long body_len = 0;
2721 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002722 int error;
2723
Willy Tarreau7838a792019-08-12 18:42:03 +02002724 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2725
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002726 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002727 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002728
2729 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002730 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002731
Christopher Faulet6884aa32019-09-23 15:28:20 +02002732 if (h2s->st != H2_SS_CLOSED) {
2733 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2734 }
2735 else {
2736 /* the connection was already killed by an RST, let's consume
2737 * the data and send another RST.
2738 */
2739 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002740 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002741 h2c->st0 = H2_CS_FRAME_E;
2742 goto send_rst;
2743 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002744
Willy Tarreau25919232019-01-03 14:48:18 +01002745 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002746 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002747 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002748
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002749 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2750 /* RFC7540#5.1 */
2751 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2752 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreauef8b8642020-12-01 10:22:43 +01002753 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002754 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002755 }
2756
Willy Tarreau25919232019-01-03 14:48:18 +01002757 if (error <= 0) {
2758 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002759 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002760
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002761 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002762 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002763 h2c->st0 = H2_CS_FRAME_E;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002764 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002765 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002766 }
2767
Christopher Fauletfa922f02019-05-07 10:55:17 +02002768 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002769 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002770
Willy Tarreau927b88b2019-03-04 08:03:25 +01002771 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002772 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002773 else if (h2s->flags & H2_SF_ES_RCVD) {
2774 if (h2s->st == H2_SS_OPEN)
2775 h2s->st = H2_SS_HREM;
2776 else if (h2s->st == H2_SS_HLOC)
2777 h2s_close(h2s);
2778 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002779
Willy Tarreau022e5e52020-09-10 09:33:15 +02002780 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 +02002781 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002782 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002783 fail:
2784 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2785 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002786
2787 send_rst:
2788 /* make the demux send an RST for the current stream. We may only
2789 * do this if we're certain that the HEADERS frame was properly
2790 * decompressed so that the HPACK decoder is still kept up to date.
2791 */
2792 h2_release_buf(h2c, &rxbuf);
2793 h2c->st0 = H2_CS_FRAME_E;
2794
Willy Tarreau022e5e52020-09-10 09:33:15 +02002795 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 +02002796 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2797 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002798}
2799
Willy Tarreau454f9052017-10-26 19:40:35 +02002800/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2801 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2802 */
2803static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2804{
2805 int error;
2806
Willy Tarreau7838a792019-08-12 18:42:03 +02002807 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2808
Willy Tarreau454f9052017-10-26 19:40:35 +02002809 /* note that empty DATA frames are perfectly valid and sometimes used
2810 * to signal an end of stream (with the ES flag).
2811 */
2812
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002813 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002814 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002815
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002816 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002817 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002818
2819 /* now either the frame is complete or the buffer is complete */
2820
Willy Tarreau454f9052017-10-26 19:40:35 +02002821 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2822 /* RFC7540#6.1 */
2823 error = H2_ERR_STREAM_CLOSED;
2824 goto strm_err;
2825 }
2826
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002827 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002828 /* RFC7540#8.1.2 */
2829 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002830 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002831 goto strm_err;
2832 }
2833
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002834 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002835 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002836
Willy Tarreau454f9052017-10-26 19:40:35 +02002837 /* call the upper layers to process the frame, then let the upper layer
2838 * notify the stream about any change.
2839 */
2840 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002841 /* The upper layer has already closed, this may happen on
2842 * 4xx/redirects during POST, or when receiving a response
2843 * from an H2 server after the client has aborted.
2844 */
2845 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002846 goto strm_err;
2847 }
2848
Willy Tarreau8f650c32017-11-21 19:36:21 +01002849 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002850 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002851
Willy Tarreau721c9742017-11-07 11:05:42 +01002852 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002853 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002854 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002855 }
2856
2857 /* check for completion : the callee will change this to FRAME_A or
2858 * FRAME_H once done.
2859 */
2860 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002861 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002862
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002863 /* last frame */
2864 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002865 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002866 if (h2s->st == H2_SS_OPEN)
2867 h2s->st = H2_SS_HREM;
2868 else
2869 h2s_close(h2s);
2870
Willy Tarreau1915ca22019-01-24 11:49:37 +01002871 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2872 /* RFC7540#8.1.2 */
2873 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002874 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002875 goto strm_err;
2876 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002877 }
2878
Willy Tarreau7838a792019-08-12 18:42:03 +02002879 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002880 return 1;
2881
Willy Tarreau454f9052017-10-26 19:40:35 +02002882 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002883 h2s_error(h2s, error);
2884 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002885 fail:
2886 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 +02002887 return 0;
2888}
2889
Willy Tarreau63864812019-08-07 14:25:20 +02002890/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2891 * valid for the current stream state. This is needed only after parsing the
2892 * frame header but in practice it can be performed at any time during
2893 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2894 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2895 */
2896static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2897{
Willy Tarreau7838a792019-08-12 18:42:03 +02002898 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2899
Willy Tarreau63864812019-08-07 14:25:20 +02002900 if (h2s->st == H2_SS_IDLE &&
2901 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2902 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2903 * this state MUST be treated as a connection error
2904 */
2905 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002906 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002907 /* only log if no other stream can report the error */
2908 sess_log(h2c->conn->owner);
2909 }
Willy Tarreauef8b8642020-12-01 10:22:43 +01002910 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002911 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 +02002912 return 0;
2913 }
2914
Willy Tarreau57a18162019-11-24 14:57:53 +01002915 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2916 /* only PUSH_PROMISE would be permitted here */
2917 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01002918 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau57a18162019-11-24 14:57:53 +01002919 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2920 return 0;
2921 }
2922
Willy Tarreau63864812019-08-07 14:25:20 +02002923 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2924 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2925 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2926 * this state MUST be treated as a stream error.
2927 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2928 * PUSH_PROMISE/CONTINUATION cause connection errors.
2929 */
Amaury Denoyellea8879232020-10-27 17:16:03 +01002930 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreau63864812019-08-07 14:25:20 +02002931 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01002932 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002933 }
2934 else {
Willy Tarreau63864812019-08-07 14:25:20 +02002935 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002936 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002937 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 +02002938 return 0;
2939 }
2940
2941 /* Below the management of frames received in closed state is a
2942 * bit hackish because the spec makes strong differences between
2943 * streams closed by receiving RST, sending RST, and seeing ES
2944 * in both directions. In addition to this, the creation of a
2945 * new stream reusing the identifier of a closed one will be
2946 * detected here. Given that we cannot keep track of all closed
2947 * streams forever, we consider that unknown closed streams were
2948 * closed on RST received, which allows us to respond with an
2949 * RST without breaking the connection (eg: to abort a transfer).
2950 * Some frames have to be silently ignored as well.
2951 */
2952 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
2953 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
2954 /* #5.1.1: The identifier of a newly
2955 * established stream MUST be numerically
2956 * greater than all streams that the initiating
2957 * endpoint has opened or reserved. This
2958 * governs streams that are opened using a
2959 * HEADERS frame and streams that are reserved
2960 * using PUSH_PROMISE. An endpoint that
2961 * receives an unexpected stream identifier
2962 * MUST respond with a connection error.
2963 */
2964 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002965 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 +02002966 return 0;
2967 }
2968
Willy Tarreau4c08f122019-09-26 08:47:15 +02002969 if (h2s->flags & H2_SF_RST_RCVD &&
2970 !(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 +02002971 /* RFC7540#5.1:closed: an endpoint that
2972 * receives any frame other than PRIORITY after
2973 * receiving a RST_STREAM MUST treat that as a
2974 * stream error of type STREAM_CLOSED.
2975 *
2976 * Note that old streams fall into this category
2977 * and will lead to an RST being sent.
2978 *
2979 * However, we cannot generalize this to all frame types. Those
2980 * carrying compression state must still be processed before
2981 * being dropped or we'll desynchronize the decoder. This can
2982 * happen with request trailers received after sending an
2983 * RST_STREAM, or with header/trailers responses received after
2984 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02002985 *
2986 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002987 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02002988 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02002989 */
2990 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2991 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002992 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 +02002993 return 0;
2994 }
2995
2996 /* RFC7540#5.1:closed: if this state is reached as a
2997 * result of sending a RST_STREAM frame, the peer that
2998 * receives the RST_STREAM might have already sent
2999 * frames on the stream that cannot be withdrawn. An
3000 * endpoint MUST ignore frames that it receives on
3001 * closed streams after it has sent a RST_STREAM
3002 * frame. An endpoint MAY choose to limit the period
3003 * over which it ignores frames and treat frames that
3004 * arrive after this time as being in error.
3005 */
3006 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
3007 /* RFC7540#5.1:closed: any frame other than
3008 * PRIO/WU/RST in this state MUST be treated as
3009 * a connection error
3010 */
3011 if (h2c->dft != H2_FT_RST_STREAM &&
3012 h2c->dft != H2_FT_PRIORITY &&
3013 h2c->dft != H2_FT_WINDOW_UPDATE) {
3014 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003015 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 +02003016 return 0;
3017 }
3018 }
3019 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003020 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003021 return 1;
3022}
3023
Willy Tarreaubc933932017-10-09 16:21:43 +02003024/* process Rx frames to be demultiplexed */
3025static void h2_process_demux(struct h2c *h2c)
3026{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003027 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003028 struct h2_fh hdr;
3029 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003030 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02003031
Willy Tarreau7838a792019-08-12 18:42:03 +02003032 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3033
Willy Tarreau081d4722017-05-16 21:51:05 +02003034 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02003035 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02003036
3037 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3038 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003039 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02003040 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02003041 goto out;
3042
Willy Tarreau52eed752017-09-22 15:05:09 +02003043 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
3044 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003045 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003046 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003047 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02003048 sess_log(h2c->conn->owner);
3049 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003050 goto fail;
3051 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003052 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003053
3054 h2c->max_id = 0;
3055 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003056 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003057 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003058
3059 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003060 /* ensure that what is pending is a valid SETTINGS frame
3061 * without an ACK.
3062 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003063 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 +02003064 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003065 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003066 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003067 TRACE_PROTO("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 +02003068 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003069 if (!(h2c->flags & H2_CF_IS_BACK))
3070 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003071 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003072 goto fail;
3073 }
3074
3075 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
3076 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003077 TRACE_PROTO("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 +02003078 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3079 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003080 if (!(h2c->flags & H2_CF_IS_BACK))
3081 sess_log(h2c->conn->owner);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003082 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003083 goto fail;
3084 }
3085
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003086 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003087 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003088 TRACE_PROTO("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 +02003089 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3090 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003091 if (!(h2c->flags & H2_CF_IS_BACK))
3092 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003093 goto fail;
3094 }
3095
Willy Tarreau3bf69182018-12-21 15:34:50 +01003096 /* that's OK, switch to FRAME_P to process it. This is
3097 * a SETTINGS frame whose header has already been
3098 * deleted above.
3099 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01003100 padlen = 0;
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003101 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003102 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003103 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003104 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003105
3106 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02003107 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02003108 int ret = 0;
3109
Willy Tarreau7838a792019-08-12 18:42:03 +02003110 if (!b_data(&h2c->dbuf)) {
3111 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
Willy Tarreau02bd15b2021-02-05 12:16:01 +01003112 goto dbuf_empty;
Willy Tarreau7838a792019-08-12 18:42:03 +02003113 }
3114
3115 if (h2c->st0 >= H2_CS_ERROR) {
3116 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003117 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003118 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003119
3120 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02003121 h2c->rcvd_s = 0;
3122
Willy Tarreau7838a792019-08-12 18:42:03 +02003123 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01003124 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02003125 break;
3126
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003127 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003128 TRACE_PROTO("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 +02003129 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003130 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02003131 /* only log if no other stream can report the error */
3132 sess_log(h2c->conn->owner);
3133 }
Willy Tarreauef8b8642020-12-01 10:22:43 +01003134 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003135 break;
3136 }
3137
Christopher Fauletdd2a5622019-06-18 12:22:38 +02003138 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003139 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
3140 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
3141 * we read the pad length and drop it from the remaining
3142 * payload (one byte + the 9 remaining ones = 10 total
3143 * removed), so we have a frame payload starting after the
3144 * pad len. Flow controlled frames (DATA) also count the
3145 * padlen in the flow control, so it must be adjusted.
3146 */
3147 if (hdr.len < 1) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003148 TRACE_PROTO("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 +01003149 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003150 if (!(h2c->flags & H2_CF_IS_BACK))
3151 sess_log(h2c->conn->owner);
Willy Tarreauef8b8642020-12-01 10:22:43 +01003152 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003153 goto fail;
3154 }
3155 hdr.len--;
3156
3157 if (b_data(&h2c->dbuf) < 10)
3158 break; // missing padlen
3159
3160 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3161
3162 if (padlen > hdr.len) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003163 TRACE_PROTO("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 +01003164 /* RFC7540#6.1 : pad length = length of
3165 * frame payload or greater => error.
3166 */
3167 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003168 if (!(h2c->flags & H2_CF_IS_BACK))
3169 sess_log(h2c->conn->owner);
Willy Tarreauef8b8642020-12-01 10:22:43 +01003170 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003171 goto fail;
3172 }
3173
3174 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3175 h2c->rcvd_c++;
3176 h2c->rcvd_s++;
3177 }
3178 b_del(&h2c->dbuf, 1);
3179 }
3180 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003181
3182 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003183 h2c->dfl = hdr.len;
3184 h2c->dsi = hdr.sid;
3185 h2c->dft = hdr.ft;
3186 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003187 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003188 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 +02003189 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003190
3191 /* check for minimum basic frame format validity */
3192 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3193 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003194 TRACE_PROTO("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 +01003195 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003196 if (!(h2c->flags & H2_CF_IS_BACK))
3197 sess_log(h2c->conn->owner);
Willy Tarreauef8b8642020-12-01 10:22:43 +01003198 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003199 goto fail;
3200 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003201 }
3202
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003203 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3204 * H2_CS_FRAME_P indicates an incomplete previous operation
3205 * (most often the first attempt) and requires some validity
3206 * checks for the frame and the current state. The two other
3207 * ones are set after completion (or abortion) and must skip
3208 * validity checks.
3209 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003210 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3211
Willy Tarreau567beb82018-12-18 16:52:44 +01003212 if (tmp_h2s != h2s && h2s && h2s->cs &&
3213 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003214 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003215 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003216 (h2s->flags & H2_SF_ES_RCVD) ||
3217 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003218 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003219 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 +01003220 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003221 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003222 }
3223 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003224
Willy Tarreau63864812019-08-07 14:25:20 +02003225 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003226 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3227 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003228 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003229 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003230
Willy Tarreau7e98c052017-10-10 15:56:59 +02003231 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003232 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003233 if (h2c->st0 == H2_CS_FRAME_P) {
3234 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003235 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003236 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003237 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003238
Willy Tarreau7838a792019-08-12 18:42:03 +02003239 if (h2c->st0 == H2_CS_FRAME_A) {
3240 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 +02003241 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003242 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003243 break;
3244
Willy Tarreaucf68c782017-10-10 17:11:41 +02003245 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003246 if (h2c->st0 == H2_CS_FRAME_P) {
3247 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003248 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003249 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003250
Willy Tarreau7838a792019-08-12 18:42:03 +02003251 if (h2c->st0 == H2_CS_FRAME_A) {
3252 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 +02003253 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003254 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003255 break;
3256
Willy Tarreau26f95952017-07-27 17:18:30 +02003257 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003258 if (h2c->st0 == H2_CS_FRAME_P) {
3259 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 +02003260 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003261 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003262 break;
3263
Willy Tarreau61290ec2017-10-17 08:19:21 +02003264 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003265 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003266 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3267 * frames' parsers consume all following CONTINUATION
3268 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003269 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003270 TRACE_PROTO("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 +01003271 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003272 if (!(h2c->flags & H2_CF_IS_BACK))
3273 sess_log(h2c->conn->owner);
Willy Tarreauef8b8642020-12-01 10:22:43 +01003274 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01003275 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003276
Willy Tarreau13278b42017-10-13 19:23:14 +02003277 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003278 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003279 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003280 if (h2c->flags & H2_CF_IS_BACK)
3281 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3282 else
3283 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003284 if (tmp_h2s) {
3285 h2s = tmp_h2s;
3286 ret = 1;
3287 }
3288 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003289 HA_ATOMIC_ADD(&h2c->px_counters->headers_rcvd, 1);
Willy Tarreau13278b42017-10-13 19:23:14 +02003290 break;
3291
Willy Tarreau454f9052017-10-26 19:40:35 +02003292 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003293 if (h2c->st0 == H2_CS_FRAME_P) {
3294 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003295 ret = h2c_frt_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003296 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003297 HA_ATOMIC_ADD(&h2c->px_counters->data_rcvd, 1);
Willy Tarreau454f9052017-10-26 19:40:35 +02003298
Willy Tarreau7838a792019-08-12 18:42:03 +02003299 if (h2c->st0 == H2_CS_FRAME_A) {
3300 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 +02003301 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003302 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003303 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003304
Willy Tarreau92153fc2017-12-03 19:46:19 +01003305 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003306 if (h2c->st0 == H2_CS_FRAME_P) {
3307 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003308 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003309 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003310 break;
3311
Willy Tarreaucd234e92017-08-18 10:59:39 +02003312 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003313 if (h2c->st0 == H2_CS_FRAME_P) {
3314 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 +02003315 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003316 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003317 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_rcvd, 1);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003318 break;
3319
Willy Tarreaue96b0922017-10-30 00:28:29 +01003320 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003321 if (h2c->st0 == H2_CS_FRAME_P) {
3322 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003323 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003324 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003325 HA_ATOMIC_ADD(&h2c->px_counters->goaway_rcvd, 1);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003326 break;
3327
Willy Tarreau1c661982017-10-30 13:52:01 +01003328 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003329 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003330 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003331 /* drop frames that we ignore. They may be larger than
3332 * the buffer so we drain all of their contents until
3333 * we reach the end.
3334 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003335 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3336 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003337 h2c->dfl -= ret;
3338 ret = h2c->dfl == 0;
3339 }
3340
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003341 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003342 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003343 if (h2s->st == H2_SS_ERROR) {
3344 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 +01003345 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003346 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003347
Willy Tarreau7838a792019-08-12 18:42:03 +02003348 if (h2c->st0 == H2_CS_FRAME_E) {
3349 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 +01003350 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003351 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003352
Willy Tarreau02bd15b2021-02-05 12:16:01 +01003353 dbuf_empty:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003354 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003355 if (ret <= 0) {
3356 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau1369ea22021-01-20 10:53:13 +01003357 if (h2c->flags & H2_CF_RCVD_SHUT)
3358 h2c->flags |= H2_CF_END_REACHED;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003359 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003360 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003361
3362 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003363 if (h2c->dfl)
3364 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003365 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3366 b_del(&h2c->dbuf, ret);
3367 h2c->dfl -= ret;
3368 if (!h2c->dfl) {
3369 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3370 h2c->st0 = H2_CS_FRAME_H;
3371 h2c->dsi = -1;
3372 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003373 }
3374 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003375
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003376 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003377 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3378 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003379 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003380 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003381
Willy Tarreau1369ea22021-01-20 10:53:13 +01003382 done:
Willy Tarreau567beb82018-12-18 16:52:44 +01003383 if (h2s && h2s->cs &&
3384 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003385 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003386 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003387 (h2s->flags & H2_SF_ES_RCVD) ||
3388 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003389 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003390 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 +01003391 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003392 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003393 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003394
Willy Tarreau7838a792019-08-12 18:42:03 +02003395 if (old_iw != h2c->miw) {
3396 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003397 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003398 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003399
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003400 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003401 out:
3402 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau1369ea22021-01-20 10:53:13 +01003403 return;
3404
3405 fail:
3406 /* we can go here on missing data, blocked response or error, but we
3407 * need to check if we've met a short read condition.
3408 */
3409 if (h2c->flags & H2_CF_RCVD_SHUT)
3410 h2c->flags |= H2_CF_END_REACHED;
3411 goto done;
Willy Tarreaubc933932017-10-09 16:21:43 +02003412}
3413
Willy Tarreau989539b2020-01-10 17:01:29 +01003414/* resume each h2s eligible for sending in list head <head> */
3415static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3416{
3417 struct h2s *h2s, *h2s_back;
3418
3419 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3420
3421 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3422 if (h2c->mws <= 0 ||
3423 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3424 h2c->st0 >= H2_CS_ERROR)
3425 break;
3426
3427 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003428
Willy Tarreaud9464162020-01-10 18:25:07 +01003429 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003430 continue;
3431
Willy Tarreau5723f292020-01-10 15:16:57 +01003432 /* If the sender changed his mind and unsubscribed, let's just
3433 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003434 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003435 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3436 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003437 LIST_DEL_INIT(&h2s->list);
3438 continue;
3439 }
3440
Willy Tarreauf96508a2020-01-10 11:12:48 +01003441 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003442 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003443 tasklet_wakeup(h2s->subs->tasklet);
3444 h2s->subs->events &= ~SUB_RETRY_SEND;
3445 if (!h2s->subs->events)
3446 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003447 }
3448 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3449 tasklet_wakeup(h2s->shut_tl);
3450 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003451 }
3452
3453 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3454}
3455
Willy Tarreaubc933932017-10-09 16:21:43 +02003456/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3457 * the end.
3458 */
3459static int h2_process_mux(struct h2c *h2c)
3460{
Willy Tarreau7838a792019-08-12 18:42:03 +02003461 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3462
Willy Tarreau01b44822018-10-03 14:26:37 +02003463 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3464 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3465 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3466 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003467 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003468 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003469 goto fail;
3470 }
3471 h2c->st0 = H2_CS_SETTINGS1;
3472 }
3473 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003474 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003475 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003476 }
3477
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003478 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003479 if (h2c->rcvd_s > 0 &&
3480 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3481 h2c_send_strm_wu(h2c) < 0)
3482 goto fail;
3483
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003484 if (h2c->rcvd_c > 0 &&
3485 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3486 h2c_send_conn_wu(h2c) < 0)
3487 goto fail;
3488
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003489 /* First we always process the flow control list because the streams
3490 * waiting there were already elected for immediate emission but were
3491 * blocked just on this.
3492 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003493 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3494 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003495
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003496 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003497 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003498 if (h2c->st0 == H2_CS_ERROR) {
3499 if (h2c->max_id >= 0) {
3500 h2c_send_goaway_error(h2c, NULL);
3501 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003502 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003503 }
3504
3505 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3506 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003507 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003508 done:
3509 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3510 return 1;
3511 out0:
3512 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3513 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003514}
3515
Willy Tarreau62f52692017-10-08 23:01:42 +02003516
Willy Tarreau479998a2018-11-18 06:30:59 +01003517/* Attempt to read data, and subscribe if none available.
3518 * The function returns 1 if data has been received, otherwise zero.
3519 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003520static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003521{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003522 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003523 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003524 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003525 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003526
Willy Tarreau7838a792019-08-12 18:42:03 +02003527 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3528
3529 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3530 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003531 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003532 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003533
Willy Tarreau7838a792019-08-12 18:42:03 +02003534 if (!h2_recv_allowed(h2c)) {
3535 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003536 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003537 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003538
Willy Tarreau44e973f2018-03-01 17:49:30 +01003539 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003540 if (!buf) {
3541 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003542 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003543 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003544 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003545
Willy Tarreau1369ea22021-01-20 10:53:13 +01003546 if (h2c->flags & H2_CF_RCVD_SHUT) {
3547 TRACE_DEVEL("leaving on rcvd_shut", H2_EV_H2C_RECV, h2c->conn);
3548 return 0;
3549 }
3550
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003551 b_realign_if_empty(buf);
3552 if (!b_data(buf)) {
3553 /* try to pre-align the buffer like the
3554 * rxbufs will be to optimize memory copies. We'll make
3555 * sure that the frame header lands at the end of the
3556 * HTX block to alias it upon recv. We cannot use the
3557 * head because rcv_buf() will realign the buffer if
3558 * it's empty. Thus we cheat and pretend we already
3559 * have a few bytes there.
3560 */
3561 max = buf_room_for_htx_data(buf) + 9;
3562 buf->head = sizeof(struct htx) - 9;
3563 }
3564 else
3565 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003566
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003567 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003568
Willy Tarreau5554e632021-02-05 11:41:46 +01003569 if (max && !ret) {
Willy Tarreau1369ea22021-01-20 10:53:13 +01003570 if (conn_xprt_read0_pending(h2c->conn)) {
3571 TRACE_DATA("received read0", H2_EV_H2C_RECV, h2c->conn);
3572 h2c->flags |= H2_CF_RCVD_SHUT;
Willy Tarreau5554e632021-02-05 11:41:46 +01003573 } else if (h2_recv_allowed(h2c)) {
Willy Tarreau1369ea22021-01-20 10:53:13 +01003574 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
3575 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
3576 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003577 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003578 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003579
Olivier Houcharda1411e62018-08-17 18:42:48 +02003580 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003581 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003582 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003583 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003584 }
3585
Willy Tarreau7838a792019-08-12 18:42:03 +02003586 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003587 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003588 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003589 }
3590
3591 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003592 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003593}
3594
Willy Tarreau479998a2018-11-18 06:30:59 +01003595/* Try to send data if possible.
3596 * The function returns 1 if data have been sent, otherwise zero.
3597 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003598static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003599{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003600 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003601 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003602 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003603
Willy Tarreau7838a792019-08-12 18:42:03 +02003604 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003605
Willy Tarreau7838a792019-08-12 18:42:03 +02003606 if (conn->flags & CO_FL_ERROR) {
3607 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3608 return 1;
3609 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003610
Willy Tarreau911db9b2020-01-23 16:27:54 +01003611 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003612 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003613 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003614 }
3615
Willy Tarreaubc933932017-10-09 16:21:43 +02003616 /* This loop is quite simple : it tries to fill as much as it can from
3617 * pending streams into the existing buffer until it's reportedly full
3618 * or the end of send requests is reached. Then it tries to send this
3619 * buffer's contents out, marks it not full if at least one byte could
3620 * be sent, and tries again.
3621 *
3622 * The snd_buf() function normally takes a "flags" argument which may
3623 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3624 * data immediately comes and CO_SFL_STREAMER to indicate that the
3625 * connection is streaming lots of data (used to increase TLS record
3626 * size at the expense of latency). The former can be sent any time
3627 * there's a buffer full flag, as it indicates at least one stream
3628 * attempted to send and failed so there are pending data. An
3629 * alternative would be to set it as long as there's an active stream
3630 * but that would be problematic for ACKs until we have an absolute
3631 * guarantee that all waiters have at least one byte to send. The
3632 * latter should possibly not be set for now.
3633 */
3634
3635 done = 0;
3636 while (!done) {
3637 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003638 unsigned int released = 0;
3639 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003640
3641 /* fill as much as we can into the current buffer */
3642 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3643 done = h2_process_mux(h2c);
3644
Olivier Houchard2b094432019-01-29 18:28:36 +01003645 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003646 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003647
Christopher Faulet9a3d3fc2020-10-22 16:24:58 +02003648 if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) ||
3649 (h2c->st0 == H2_CS_ERROR2) || (h2c->flags & H2_CF_GOAWAY_FAILED))
Willy Tarreaubc933932017-10-09 16:21:43 +02003650 break;
3651
3652 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3653 flags |= CO_SFL_MSG_MORE;
3654
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003655 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3656 if (b_data(buf)) {
3657 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003658 if (!ret) {
3659 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003660 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003661 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003662 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003663 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003664 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003665 if (b_data(buf)) {
3666 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003667 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003668 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003669 }
3670 b_free(buf);
3671 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003672 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003673
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003674 if (released)
Willy Tarreau132b3a42021-02-20 12:02:46 +01003675 offer_buffers(NULL, released);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003676
Willy Tarreaubc933932017-10-09 16:21:43 +02003677 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003678 if (sent)
3679 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003680 }
3681
Willy Tarreaua2af5122017-10-09 11:56:46 +02003682 if (conn->flags & CO_FL_SOCK_WR_SH) {
3683 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003684 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003685 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003686 /* We're not full anymore, so we can wake any task that are waiting
3687 * for us.
3688 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003689 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3690 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003691
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003692 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003693 if (!br_data(h2c->mbuf)) {
3694 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003695 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003696 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003697schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003698 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3699 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003700 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003701 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003702
Willy Tarreau7838a792019-08-12 18:42:03 +02003703 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003704 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003705}
3706
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003707/* this is the tasklet referenced in h2c->wait_event.tasklet */
Willy Tarreau9a5a0e02021-01-20 14:55:01 +01003708struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003709{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003710 struct connection *conn;
3711 struct tasklet *tl = (struct tasklet *)t;
3712 int conn_in_list;
Willy Tarreaub360bb82021-03-02 16:51:09 +01003713 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02003714 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003715
Willy Tarreaub360bb82021-03-02 16:51:09 +01003716 if (status & TASK_F_USR1) {
3717 /* the tasklet was idling on an idle connection, it might have
3718 * been stolen, let's be careful!
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003719 */
Willy Tarreaub360bb82021-03-02 16:51:09 +01003720 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3721 if (t->context == NULL) {
3722 /* The connection has been taken over by another thread,
3723 * we're no longer responsible for it, so just free the
3724 * tasklet, and do nothing.
3725 */
3726 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3727 tasklet_free(tl);
3728 goto leave;
3729 }
3730 conn = h2c->conn;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003731
Willy Tarreaub360bb82021-03-02 16:51:09 +01003732 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3733 conn_in_list = conn->flags & CO_FL_LIST_MASK;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003734
Willy Tarreaub360bb82021-03-02 16:51:09 +01003735 /* Remove the connection from the list, to be sure nobody attempts
3736 * to use it while we handle the I/O events
3737 */
3738 if (conn_in_list)
3739 MT_LIST_DEL(&conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003740
Willy Tarreaub360bb82021-03-02 16:51:09 +01003741 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3742 } else {
3743 /* we're certain the connection was not in an idle list */
3744 conn = h2c->conn;
3745 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3746 conn_in_list = 0;
3747 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003748
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003749 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003750 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003751 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003752 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003753 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003754 ret = h2_process(h2c);
3755
3756 /* If we were in an idle list, we want to add it back into it,
3757 * unless h2_process() returned -1, which mean it has destroyed
3758 * the connection (testing !ret is enough, if h2_process() wasn't
3759 * called then ret will be 0 anyway.
3760 */
3761 if (!ret && conn_in_list) {
3762 struct server *srv = objt_server(conn->target);
3763
3764 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003765 MT_LIST_ADDQ(&srv->safe_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003766 else
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003767 MT_LIST_ADDQ(&srv->idle_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003768 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003769
Willy Tarreau38468772020-06-28 00:31:13 +02003770leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003771 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003772 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003773}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003774
Willy Tarreau62f52692017-10-08 23:01:42 +02003775/* callback called on any event by the connection handler.
3776 * It applies changes and returns zero, or < 0 if it wants immediate
3777 * destruction of the connection (which normally doesn not happen in h2).
3778 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003779static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003780{
Olivier Houchard7505f942018-08-21 18:10:44 +02003781 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003782
Willy Tarreau7838a792019-08-12 18:42:03 +02003783 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3784
Willy Tarreau5554e632021-02-05 11:41:46 +01003785 if (!(h2c->flags & H2_CF_DEM_BLOCK_ANY) &&
3786 (b_data(&h2c->dbuf) || (h2c->flags & H2_CF_RCVD_SHUT))) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003787 h2_process_demux(h2c);
3788
3789 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003790 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003791
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003792 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003793 h2c->flags &= ~H2_CF_DEM_DFULL;
3794 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003795 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003796
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003797 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003798 /* frontend is stopping, reload likely in progress, let's try
3799 * to announce a graceful shutdown if not yet done. We don't
3800 * care if it fails, it will be tried again later.
3801 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003802 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003803 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3804 if (h2c->last_sid < 0)
3805 h2c->last_sid = (1U << 31) - 1;
3806 h2c_send_goaway_error(h2c, NULL);
3807 }
3808 }
3809
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003810 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003811 * If we received early data, and the handshake is done, wake
3812 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003813 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003814 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003815 (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 +01003816 struct eb32_node *node;
3817 struct h2s *h2s;
3818
3819 h2c->flags |= H2_CF_WAIT_FOR_HS;
3820 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3821
3822 while (node) {
3823 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003824 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003825 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003826 node = eb32_next(node);
3827 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003828 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003829
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003830 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003831 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3832 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3833 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003834 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003835
3836 if (eb_is_empty(&h2c->streams_by_id)) {
3837 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003838 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003839 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003840 return -1;
3841 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003842
3843 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003844 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003845 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003846 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003847 }
3848 else if (h2c->st0 == H2_CS_ERROR) {
3849 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003850 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003851 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003852 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003853 }
3854
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003855 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003856 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003857
Olivier Houchard53216e72018-10-10 15:46:36 +02003858 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3859 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3860 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003861 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003862 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3863 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003864 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003865
Willy Tarreau3f133572017-10-31 19:21:06 +01003866 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003867 if (h2c_may_expire(h2c))
3868 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3869 else
3870 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003871 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003872 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003873
Olivier Houchard7505f942018-08-21 18:10:44 +02003874 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003875 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003876 return 0;
3877}
3878
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003879/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003880static int h2_wake(struct connection *conn)
3881{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003882 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003883 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003884
Willy Tarreau7838a792019-08-12 18:42:03 +02003885 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3886 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003887 if (ret >= 0)
3888 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003889 TRACE_LEAVE(H2_EV_H2C_WAKE);
3890 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003891}
3892
Willy Tarreauea392822017-10-31 10:02:25 +01003893/* Connection timeout management. The principle is that if there's no receipt
3894 * nor sending for a certain amount of time, the connection is closed. If the
3895 * MUX buffer still has lying data or is not allocatable, the connection is
3896 * immediately killed. If it's allocatable and empty, we attempt to send a
3897 * GOAWAY frame.
3898 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003899static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003900{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003901 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003902 int expired = tick_is_expired(t->expire, now_ms);
3903
Willy Tarreau7838a792019-08-12 18:42:03 +02003904 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3905
Willy Tarreaubd42e922020-06-30 11:19:23 +02003906 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003907 /* Make sure nobody stole the connection from us */
3908 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3909
3910 /* Somebody already stole the connection from us, so we should not
3911 * free it, we just have to free the task.
3912 */
3913 if (!t->context) {
3914 h2c = NULL;
Willy Tarreau46ac7812020-07-04 07:16:18 +02003915 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003916 goto do_leave;
3917 }
3918
3919
Willy Tarreaubd42e922020-06-30 11:19:23 +02003920 if (!expired) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003921 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003922 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3923 return t;
3924 }
Willy Tarreauea392822017-10-31 10:02:25 +01003925
Willy Tarreaubd42e922020-06-30 11:19:23 +02003926 if (!h2c_may_expire(h2c)) {
3927 /* we do still have streams but all of them are idle, waiting
3928 * for the data layer, so we must not enforce the timeout here.
3929 */
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003930 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003931 t->expire = TICK_ETERNITY;
3932 return t;
3933 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003934
Willy Tarreaubd42e922020-06-30 11:19:23 +02003935 /* We're about to destroy the connection, so make sure nobody attempts
3936 * to steal it from us.
3937 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02003938 if (h2c->conn->flags & CO_FL_LIST_MASK)
3939 MT_LIST_DEL(&h2c->conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003940
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003941 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003942 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003943
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003944do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02003945 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003946
3947 if (!h2c) {
3948 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003949 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02003950 return NULL;
3951 }
3952
3953 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003954 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003955 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003956
Willy Tarreau662fafc2019-05-26 09:43:07 +02003957 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003958 /* don't even try to send a GOAWAY, the buffer is stuck */
3959 h2c->flags |= H2_CF_GOAWAY_FAILED;
3960 }
3961
3962 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003963 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003964 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3965 h2c->flags |= H2_CF_GOAWAY_FAILED;
3966
Willy Tarreau662fafc2019-05-26 09:43:07 +02003967 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003968 unsigned int released = 0;
3969 struct buffer *buf;
3970
3971 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3972 if (b_data(buf)) {
3973 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3974 if (!ret)
3975 break;
3976 b_del(buf, ret);
3977 if (b_data(buf))
3978 break;
3979 b_free(buf);
3980 released++;
3981 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003982 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003983
3984 if (released)
Willy Tarreau132b3a42021-02-20 12:02:46 +01003985 offer_buffers(NULL, released);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003986 }
Willy Tarreauea392822017-10-31 10:02:25 +01003987
Willy Tarreau4481e262019-10-31 15:36:30 +01003988 /* in any case this connection must not be considered idle anymore */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003989 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003990 MT_LIST_DEL((struct mt_list *)&h2c->conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003991 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003992
Willy Tarreau0975f112018-03-29 15:22:59 +02003993 /* either we can release everything now or it will be done later once
3994 * the last stream closes.
3995 */
3996 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003997 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003998
Willy Tarreau7838a792019-08-12 18:42:03 +02003999 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01004000 return NULL;
4001}
4002
4003
Willy Tarreau62f52692017-10-08 23:01:42 +02004004/*******************************************/
4005/* functions below are used by the streams */
4006/*******************************************/
4007
4008/*
4009 * Attach a new stream to a connection
4010 * (Used for outgoing connections)
4011 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01004012static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02004013{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004014 struct conn_stream *cs;
4015 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004016 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004017
Willy Tarreau7838a792019-08-12 18:42:03 +02004018 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02004019 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02004020 if (!cs) {
4021 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004022 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004023 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01004024 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004025 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004026 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004027 cs_free(cs);
4028 return NULL;
4029 }
Willy Tarreaub360bb82021-03-02 16:51:09 +01004030
4031 /* the connection is not idle anymore, let's mark this */
4032 HA_ATOMIC_AND(&h2c->wait_event.tasklet->state, ~TASK_F_USR1);
Willy Tarreau9a4864d2021-03-02 17:27:58 +01004033 xprt_set_used(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
Willy Tarreaub360bb82021-03-02 16:51:09 +01004034
Willy Tarreau7838a792019-08-12 18:42:03 +02004035 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01004036 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02004037}
4038
Willy Tarreaufafd3982018-11-18 21:29:20 +01004039/* Retrieves the first valid conn_stream from this connection, or returns NULL.
4040 * We have to scan because we may have some orphan streams. It might be
4041 * beneficial to scan backwards from the end to reduce the likeliness to find
4042 * orphans.
4043 */
4044static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
4045{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01004046 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01004047 struct h2s *h2s;
4048 struct eb32_node *node;
4049
4050 node = eb32_first(&h2c->streams_by_id);
4051 while (node) {
4052 h2s = container_of(node, struct h2s, by_id);
4053 if (h2s->cs)
4054 return h2s->cs;
4055 node = eb32_next(node);
4056 }
4057 return NULL;
4058}
4059
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004060static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
4061{
4062 int ret = 0;
4063 struct h2c *h2c = conn->ctx;
4064
4065 switch (mux_ctl) {
4066 case MUX_STATUS:
4067 /* Only consider the mux to be ready if we're done with
4068 * the preface and settings, and we had no error.
4069 */
4070 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
4071 ret |= MUX_STATUS_READY;
4072 return ret;
4073 default:
4074 return -1;
4075 }
4076}
4077
Willy Tarreau62f52692017-10-08 23:01:42 +02004078/*
Olivier Houchard060ed432018-11-06 16:32:42 +01004079 * Destroy the mux and the associated connection, if it is no longer used
4080 */
Christopher Faulet73c12072019-04-08 11:23:22 +02004081static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01004082{
Christopher Faulet73c12072019-04-08 11:23:22 +02004083 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01004084
Willy Tarreau7838a792019-08-12 18:42:03 +02004085 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02004086 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02004087 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004088 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01004089}
4090
4091/*
Willy Tarreau62f52692017-10-08 23:01:42 +02004092 * Detach the stream from the connection and possibly release the connection.
4093 */
4094static void h2_detach(struct conn_stream *cs)
4095{
Willy Tarreau60935142017-10-16 18:11:19 +02004096 struct h2s *h2s = cs->ctx;
4097 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01004098 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004099
Willy Tarreau7838a792019-08-12 18:42:03 +02004100 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
4101
Willy Tarreau60935142017-10-16 18:11:19 +02004102 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004103 if (!h2s) {
4104 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02004105 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004106 }
Willy Tarreau60935142017-10-16 18:11:19 +02004107
Willy Tarreaud9464162020-01-10 18:25:07 +01004108 /* there's no txbuf so we're certain not to be able to send anything */
4109 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02004110
Olivier Houchardf502aca2018-12-14 19:42:40 +01004111 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004112 h2c = h2s->h2c;
4113 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02004114 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01004115 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
4116 !h2_frt_has_too_many_cs(h2c)) {
4117 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02004118 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004119 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02004120 }
Willy Tarreau60935142017-10-16 18:11:19 +02004121
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004122 /* this stream may be blocked waiting for some data to leave (possibly
4123 * an ES or RST frame), so orphan it in this case.
4124 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02004125 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02004126 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01004127 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01004128 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004129 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004130 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004131 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004132
Willy Tarreau45f752e2017-10-30 15:44:59 +01004133 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
4134 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
4135 /* unblock the connection if it was blocked on this
4136 * stream.
4137 */
4138 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
4139 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004140 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01004141 }
4142
Willy Tarreau71049cc2018-03-28 13:56:39 +02004143 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02004144
Christopher Faulet9b79a102019-07-15 11:22:56 +02004145 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01004146 if (!(h2c->conn->flags &
4147 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004148 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02004149 /* Add the connection in the session server list, if not already done */
4150 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
4151 h2c->conn->owner = NULL;
4152 if (eb_is_empty(&h2c->streams_by_id)) {
4153 h2c->conn->mux->destroy(h2c);
4154 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4155 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02004156 }
4157 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02004158 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004159 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
4160 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
4161 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01004162 return;
4163 }
4164 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004165 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004166 else {
4167 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004168 /* If the connection is owned by the session, first remove it
4169 * from its list
4170 */
4171 if (h2c->conn->owner) {
4172 session_unown_conn(h2c->conn->owner, h2c->conn);
4173 h2c->conn->owner = NULL;
4174 }
4175
Willy Tarreaub360bb82021-03-02 16:51:09 +01004176 /* mark that the tasklet may lose its context to another thread and
4177 * that the handler needs to check it under the idle conns lock.
4178 */
4179 HA_ATOMIC_OR(&h2c->wait_event.tasklet->state, TASK_F_USR1);
Willy Tarreau9a4864d2021-03-02 17:27:58 +01004180 xprt_set_idle(h2c->conn, h2c->conn->xprt, h2c->conn->xprt_ctx);
4181
Olivier Houcharddc2f2752020-02-13 19:12:07 +01004182 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01004183 /* The server doesn't want it, let's kill the connection right away */
4184 h2c->conn->mux->destroy(h2c);
4185 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4186 return;
4187 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01004188 /* At this point, the connection has been added to the
4189 * server idle list, so another thread may already have
4190 * hijacked it, so we can't do anything with it.
4191 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01004192 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
4193 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01004194
Olivier Houchard8a786902018-12-15 16:05:40 +01004195 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004196 else if (MT_LIST_ISEMPTY(&h2c->conn->list) &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004197 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
4198 !LIST_ADDED(&h2c->conn->session_list)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004199 LIST_ADD(&__objt_server(h2c->conn->target)->available_conns[tid], mt_list_to_list(&h2c->conn->list));
4200 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004201 }
4202 }
4203 }
4204
Willy Tarreaue323f342018-03-28 13:51:45 +02004205 /* We don't want to close right now unless we're removing the
4206 * last stream, and either the connection is in error, or it
4207 * reached the ID already specified in a GOAWAY frame received
4208 * or sent (as seen by last_sid >= 0).
4209 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004210 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004211 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004212 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004213 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004214 }
4215 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004216 if (h2c_may_expire(h2c))
4217 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4218 else
4219 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004220 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004221 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004222 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004223 else
4224 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004225}
4226
Willy Tarreau88bdba32019-05-13 18:17:53 +02004227/* Performs a synchronous or asynchronous shutr(). */
4228static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004229{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004230 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004231
Willy Tarreauf983d002019-05-14 10:40:21 +02004232 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004233 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004234
Willy Tarreau7838a792019-08-12 18:42:03 +02004235 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4236
Willy Tarreau18059042019-01-31 19:12:48 +01004237 /* a connstream may require us to immediately kill the whole connection
4238 * for example because of a "tcp-request content reject" rule that is
4239 * normally used to limit abuse. In this case we schedule a goaway to
4240 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004241 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004242 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004243 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004244 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004245 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4246 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4247 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004248 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4249 /* Nothing was never sent for this stream, so reset with
4250 * REFUSED_STREAM error to let the client retry the
4251 * request.
4252 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004253 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004254 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4255 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004256 else {
4257 /* a final response was already provided, we don't want this
4258 * stream anymore. This may happen when the server responds
4259 * before the end of an upload and closes quickly (redirect,
4260 * deny, ...)
4261 */
4262 h2s_error(h2s, H2_ERR_CANCEL);
4263 }
Willy Tarreau18059042019-01-31 19:12:48 +01004264
Willy Tarreau90c32322017-11-24 08:00:30 +01004265 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004266 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004267 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004268
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004269 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004270 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004271 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004272 done:
4273 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004274 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004275 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004276add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004277 /* Let the handler know we want to shutr, and add ourselves to the
4278 * most relevant list if not yet done. h2_deferred_shut() will be
4279 * automatically called via the shut_tl tasklet when there's room
4280 * again.
4281 */
4282 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004283 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004284 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004285 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004286 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004287 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004288 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004289 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004290 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004291}
4292
Willy Tarreau88bdba32019-05-13 18:17:53 +02004293/* Performs a synchronous or asynchronous shutw(). */
4294static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004295{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004296 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004297
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004298 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004299 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004300
Willy Tarreau7838a792019-08-12 18:42:03 +02004301 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4302
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004303 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004304 /* we can cleanly close using an empty data frame only after headers */
4305
4306 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4307 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004308 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004309
4310 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004311 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004312 else
4313 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004314 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004315 /* a connstream may require us to immediately kill the whole connection
4316 * for example because of a "tcp-request content reject" rule that is
4317 * normally used to limit abuse. In this case we schedule a goaway to
4318 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004319 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004320 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004321 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004322 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004323 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4324 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4325 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004326 else {
4327 /* Nothing was never sent for this stream, so reset with
4328 * REFUSED_STREAM error to let the client retry the
4329 * request.
4330 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004331 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004332 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4333 }
Willy Tarreau18059042019-01-31 19:12:48 +01004334
Willy Tarreau90c32322017-11-24 08:00:30 +01004335 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004336 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004337 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004338
Willy Tarreau00dd0782018-03-01 16:31:34 +01004339 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004340 }
4341
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004342 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004343 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004344
4345 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4346
Willy Tarreau88bdba32019-05-13 18:17:53 +02004347 done:
4348 h2s->flags &= ~H2_SF_WANT_SHUTW;
4349 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004350
4351 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004352 /* Let the handler know we want to shutw, and add ourselves to the
4353 * most relevant list if not yet done. h2_deferred_shut() will be
4354 * automatically called via the shut_tl tasklet when there's room
4355 * again.
4356 */
4357 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004358 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004359 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004360 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004361 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004362 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004363 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004364 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004365 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004366}
4367
Willy Tarreau5723f292020-01-10 15:16:57 +01004368/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004369 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4370 * and prevented the last frame from being emitted.
4371 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004372static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
4373{
4374 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004375 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004376
Willy Tarreau7838a792019-08-12 18:42:03 +02004377 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4378
Willy Tarreau5723f292020-01-10 15:16:57 +01004379 if (h2s->flags & H2_SF_NOTIFIED) {
4380 /* some data processing remains to be done first */
4381 goto end;
4382 }
4383
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004384 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004385 h2_do_shutw(h2s);
4386
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004387 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004388 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004389
Willy Tarreau88bdba32019-05-13 18:17:53 +02004390 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004391 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004392 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004393
Willy Tarreau88bdba32019-05-13 18:17:53 +02004394 if (!h2s->cs) {
4395 h2s_destroy(h2s);
4396 if (h2c_is_dead(h2c))
4397 h2_release(h2c);
4398 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004399 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004400 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004401 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004402 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004403}
4404
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004405/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004406static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4407{
4408 struct h2s *h2s = cs->ctx;
4409
Willy Tarreau7838a792019-08-12 18:42:03 +02004410 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004411 if (cs->flags & CS_FL_KILL_CONN)
4412 h2s->flags |= H2_SF_KILL_CONN;
4413
Willy Tarreau7838a792019-08-12 18:42:03 +02004414 if (mode)
4415 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004416
Willy Tarreau7838a792019-08-12 18:42:03 +02004417 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004418}
4419
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004420/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004421static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4422{
4423 struct h2s *h2s = cs->ctx;
4424
Willy Tarreau7838a792019-08-12 18:42:03 +02004425 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004426 if (cs->flags & CS_FL_KILL_CONN)
4427 h2s->flags |= H2_SF_KILL_CONN;
4428
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004429 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004430 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004431}
4432
Christopher Faulet9b79a102019-07-15 11:22:56 +02004433/* Decode the payload of a HEADERS frame and produce the HTX request or response
4434 * depending on the connection's side. Returns a positive value on success, a
4435 * negative value on failure, or 0 if it couldn't proceed. May report connection
4436 * errors in h2c->errcode if the frame is non-decodable and the connection
4437 * unrecoverable. In absence of connection error when a failure is reported, the
4438 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004439 *
4440 * The function may fold CONTINUATION frames into the initial HEADERS frame
4441 * by removing padding and next frame header, then moving the CONTINUATION
4442 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4443 * leaving a hole between the main frame and the beginning of the next one.
4444 * The possibly remaining incomplete or next frame at the end may be moved
4445 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4446 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4447 *
4448 * A buffer at the beginning of processing may look like this :
4449 *
4450 * ,---.---------.-----.--------------.--------------.------.---.
4451 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4452 * `---^---------^-----^--------------^--------------^------^---'
4453 * | | <-----> | |
4454 * area | dpl | wrap
4455 * |<--------------> |
4456 * | dfl |
4457 * |<-------------------------------------------------->|
4458 * head data
4459 *
4460 * Padding is automatically overwritten when folding, participating to the
4461 * hole size after dfl :
4462 *
4463 * ,---.------------------------.-----.--------------.------.---.
4464 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4465 * `---^------------------------^-----^--------------^------^---'
4466 * | | <-----> | |
4467 * area | hole | wrap
4468 * |<-----------------------> |
4469 * | dfl |
4470 * |<-------------------------------------------------->|
4471 * head data
4472 *
4473 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4474 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4475 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004476 *
4477 * The <flags> field must point to either the stream's flags or to a copy of it
4478 * so that the function can update the following flags :
4479 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004480 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004481 *
4482 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4483 * decoding, in order to detect if we're dealing with a headers or a trailers
4484 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004485 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01004486static int h2c_decode_headers(struct h2c *h2c, struct buffer *rxbuf, uint32_t *flags, unsigned long long *body_len)
Willy Tarreau13278b42017-10-13 19:23:14 +02004487{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004488 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004489 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004490 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004491 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004492 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004493 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004494 int flen; // header frame len
4495 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004496 int ret = 0;
4497 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004498 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004499
Willy Tarreau7838a792019-08-12 18:42:03 +02004500 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4501
Willy Tarreauea18f862018-12-22 20:19:26 +01004502next_frame:
4503 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4504 goto leave; // incomplete input frame
4505
4506 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4507 * this case, we'll try to paste it immediately after the initial
4508 * HEADERS frame payload and kill any possible padding. The initial
4509 * frame's length will be increased to represent the concatenation
4510 * of the two frames. The next frame is read from position <tlen>
4511 * and written at position <flen> (minus padding if some is present).
4512 */
4513 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4514 struct h2_fh hdr;
4515 int clen; // CONTINUATION frame's payload length
4516
Willy Tarreau7838a792019-08-12 18:42:03 +02004517 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 +01004518 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4519 /* no more data, the buffer may be full, either due to
4520 * too large a frame or because of too large a hole that
4521 * we're going to compact at the end.
4522 */
4523 goto leave;
4524 }
4525
4526 if (hdr.ft != H2_FT_CONTINUATION) {
4527 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004528 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 +01004529 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01004530 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004531 goto fail;
4532 }
4533
4534 if (hdr.sid != h2c->dsi) {
4535 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004536 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 +01004537 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01004538 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004539 goto fail;
4540 }
4541
4542 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4543 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004544 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 +01004545 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4546 goto fail;
4547 }
4548
4549 /* detect when we must stop aggragating frames */
4550 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4551
4552 /* Take as much as we can of the CONTINUATION frame's payload */
4553 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4554 if (clen > hdr.len)
4555 clen = hdr.len;
4556
4557 /* Move the frame's payload over the padding, hole and frame
4558 * header. At least one of hole or dpl is null (see diagrams
4559 * above). The hole moves after the new aggragated frame.
4560 */
4561 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4562 h2c->dfl += clen - h2c->dpl;
4563 hole += h2c->dpl + 9;
4564 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004565 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 +01004566 goto next_frame;
4567 }
4568
4569 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004570
Willy Tarreau13278b42017-10-13 19:23:14 +02004571 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004572 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004573 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004574 copy = alloc_trash_chunk();
4575 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004576 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 +02004577 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4578 goto fail;
4579 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004580 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4581 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4582 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004583 }
4584
Willy Tarreau13278b42017-10-13 19:23:14 +02004585 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4586 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004587 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004588 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004589 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 +01004590 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01004591 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004592 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004593 }
4594
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004595 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004596 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 +01004597 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4598 goto fail;
4599 }
4600
Willy Tarreau13278b42017-10-13 19:23:14 +02004601 hdrs += 5; // stream dep = 4, weight = 1
4602 flen -= 5;
4603 }
4604
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004605 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004606 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 +01004607 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004608 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004609 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004610
Willy Tarreau937f7602018-02-26 15:22:17 +01004611 /* we can't retry a failed decompression operation so we must be very
4612 * careful not to take any risks. In practice the output buffer is
4613 * always empty except maybe for trailers, in which case we simply have
4614 * to wait for the upper layer to finish consuming what is available.
4615 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004616 htx = htx_from_buf(rxbuf);
4617 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004618 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 +02004619 h2c->flags |= H2_CF_DEM_SFULL;
4620 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004621 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004622
Willy Tarreau25919232019-01-03 14:48:18 +01004623 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004624 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4625 sizeof(list)/sizeof(list[0]), tmp);
4626 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004627 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 +01004628 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4629 goto fail;
4630 }
4631
Willy Tarreau25919232019-01-03 14:48:18 +01004632 /* The PACK decompressor was updated, let's update the input buffer and
4633 * the parser's state to commit these changes and allow us to later
4634 * fail solely on the stream if needed.
4635 */
4636 b_del(&h2c->dbuf, h2c->dfl + hole);
4637 h2c->dfl = hole = 0;
4638 h2c->st0 = H2_CS_FRAME_H;
4639
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004640 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004641 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004642
Willy Tarreau88d138e2019-01-02 19:38:14 +01004643 if (*flags & H2_SF_HEADERS_RCVD)
4644 goto trailers;
4645
4646 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004647 if (h2c->flags & H2_CF_IS_BACK)
4648 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
4649 else
4650 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004651
4652 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004653 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004654 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 +01004655 goto fail;
4656 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004657
Willy Tarreau174b06a2018-04-25 18:13:58 +02004658 if (msgf & H2_MSGF_BODY) {
4659 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004660 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004661 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004662 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004663 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004664 }
4665
Willy Tarreau88d138e2019-01-02 19:38:14 +01004666 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004667 /* indicate that a HEADERS frame was received for this stream, except
4668 * for 1xx responses. For 1xx responses, another HEADERS frame is
4669 * expected.
4670 */
4671 if (!(msgf & H2_MSGF_RSP_1XX))
4672 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004673
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02004674 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004675 /* Mark the end of message using EOM */
Christopher Faulet810df062020-07-22 16:20:34 +02004676 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004677 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
4678 TRACE_STATE("failed to append HTX EOM block into rxbuf", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_H2S_ERR, h2c->conn);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004679 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004680 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004681 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004682
Willy Tarreau86277d42019-01-02 15:36:11 +01004683 /* success */
4684 ret = 1;
4685
Willy Tarreau68dd9852017-07-03 14:44:26 +02004686 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004687 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004688 * move the remaining data over it.
4689 */
4690 if (hole) {
4691 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4692 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4693 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4694 b_sub(&h2c->dbuf, hole);
4695 }
4696
Willy Tarreau97215ca2019-04-29 10:20:21 +02004697 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004698 /* too large frames */
4699 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004700 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004701 }
4702
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004703 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004704 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004705 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004706 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004707 return ret;
4708
Willy Tarreau68dd9852017-07-03 14:44:26 +02004709 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004710 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004711 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004712
4713 trailers:
4714 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004715 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4716 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004717 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 +01004718 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauef8b8642020-12-01 10:22:43 +01004719 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004720 goto fail;
4721 }
4722
Christopher Faulet9b79a102019-07-15 11:22:56 +02004723 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004724 if (h2_make_htx_trailers(list, htx) <= 0) {
4725 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 +02004726 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004727 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004728 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004729}
4730
Christopher Faulet9b79a102019-07-15 11:22:56 +02004731/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004732 * parser state is automatically updated. Returns > 0 if it could completely
4733 * send the current frame, 0 if it couldn't complete, in which case
4734 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4735 * DATA frame can return 0 as a valid result). Stream errors are reported in
4736 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4737 * have checked the frame header and ensured that the frame was complete or the
4738 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004739 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004740static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004741{
4742 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004743 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004744 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004745 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004746 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004747 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004748
Willy Tarreau7838a792019-08-12 18:42:03 +02004749 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4750
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004751 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004752
Olivier Houchard638b7992018-08-16 15:41:52 +02004753 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004754 if (!csbuf) {
4755 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004756 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 +01004757 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004758 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004759 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004760
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004761try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004762 flen = h2c->dfl - h2c->dpl;
4763 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004764 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004765
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004766 if (flen > b_data(&h2c->dbuf)) {
4767 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004768 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004769 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004770 }
4771
Christopher Faulet9b79a102019-07-15 11:22:56 +02004772 block = htx_free_data_space(htx);
4773 if (!block) {
4774 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004775 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 +02004776 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004777 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004778 if (flen > block)
4779 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004780
Christopher Faulet9b79a102019-07-15 11:22:56 +02004781 /* here, flen is the max we can copy into the output buffer */
4782 block = b_contig_data(&h2c->dbuf, 0);
4783 if (flen > block)
4784 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004785
Christopher Faulet9b79a102019-07-15 11:22:56 +02004786 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004787 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 +02004788
Christopher Faulet9b79a102019-07-15 11:22:56 +02004789 b_del(&h2c->dbuf, sent);
4790 h2c->dfl -= sent;
4791 h2c->rcvd_c += sent;
4792 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004793
Christopher Faulet9b79a102019-07-15 11:22:56 +02004794 if (h2s->flags & H2_SF_DATA_CLEN) {
4795 h2s->body_len -= sent;
4796 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004797 }
4798
Christopher Faulet9b79a102019-07-15 11:22:56 +02004799 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004800 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004801 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 +01004802 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004803 }
4804
Christopher Faulet9b79a102019-07-15 11:22:56 +02004805 goto try_again;
4806
Willy Tarreau4a28da12018-01-04 14:41:00 +01004807 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004808 /* here we're done with the frame, all the payload (except padding) was
4809 * transferred.
4810 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004811
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004812 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Faulet810df062020-07-22 16:20:34 +02004813 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004814 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004815 TRACE_STATE("h2s rxbuf is full, failed to add EOM", H2_EV_RX_FRAME|H2_EV_RX_DATA|H2_EV_H2S_BLK, h2c->conn, h2s);
Christopher Faulet9b79a102019-07-15 11:22:56 +02004816 h2c->flags |= H2_CF_DEM_SFULL;
4817 goto fail;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004818 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004819 }
4820
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004821 h2c->rcvd_c += h2c->dpl;
4822 h2c->rcvd_s += h2c->dpl;
4823 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004824 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004825 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004826 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004827 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004828 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004829 if (htx)
4830 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004831 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004832 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004833}
4834
Willy Tarreau115e83b2018-12-01 19:17:53 +01004835/* Try to send a HEADERS frame matching HTX response present in HTX message
4836 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4837 * must check the stream's status to detect any error which might have happened
4838 * subsequently to a successful send. The htx blocks are automatically removed
4839 * from the message. The htx message is assumed to be valid since produced from
4840 * the internal code, hence it contains a start line, an optional series of
4841 * header blocks and an end of header, otherwise an invalid frame could be
4842 * emitted and the resulting htx message could be left in an inconsistent state.
4843 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004844static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004845{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004846 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004847 struct h2c *h2c = h2s->h2c;
4848 struct htx_blk *blk;
4849 struct htx_blk *blk_end;
4850 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004851 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004852 struct htx_sl *sl;
4853 enum htx_blk_type type;
4854 int es_now = 0;
4855 int ret = 0;
4856 int hdr;
4857 int idx;
4858
Willy Tarreau7838a792019-08-12 18:42:03 +02004859 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4860
Willy Tarreau115e83b2018-12-01 19:17:53 +01004861 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004862 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004863 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004864 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004865 return 0;
4866 }
4867
Willy Tarreau115e83b2018-12-01 19:17:53 +01004868 /* determine the first block which must not be deleted, blk_end may
4869 * be NULL if all blocks have to be deleted.
4870 */
4871 idx = htx_get_head(htx);
4872 blk_end = NULL;
4873 while (idx != -1) {
4874 type = htx_get_blk_type(htx_get_blk(htx, idx));
4875 idx = htx_get_next(htx, idx);
4876 if (type == HTX_BLK_EOH) {
4877 if (idx != -1)
4878 blk_end = htx_get_blk(htx, idx);
4879 break;
4880 }
4881 }
4882
4883 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004884 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004885 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_RES_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004886 ALREADY_CHECKED(blk);
4887 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004888 h2s->status = sl->info.res.status;
Willy Tarreau7838a792019-08-12 18:42:03 +02004889 if (h2s->status < 100 || h2s->status > 999) {
4890 TRACE_PROTO("will not encode an invalid status code", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreauaafdf582018-12-10 18:06:40 +01004891 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004892 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004893
4894 /* and the rest of the headers, that we dump starting at header 0 */
4895 hdr = 0;
4896
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004897 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004898 while ((idx = htx_get_next(htx, idx)) != -1) {
4899 blk = htx_get_blk(htx, idx);
4900 type = htx_get_blk_type(blk);
4901
4902 if (type == HTX_BLK_UNUSED)
4903 continue;
4904
4905 if (type != HTX_BLK_HDR)
4906 break;
4907
Willy Tarreau7838a792019-08-12 18:42:03 +02004908 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4909 TRACE_PROTO("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004910 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004911 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004912
4913 list[hdr].n = htx_get_blk_name(htx, blk);
4914 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004915 hdr++;
4916 }
4917
4918 /* marker for end of headers */
4919 list[hdr].n = ist("");
4920
4921 if (h2s->status == 204 || h2s->status == 304) {
4922 /* no contents, claim c-len is present and set to zero */
4923 es_now = 1;
4924 }
4925
Willy Tarreau9c218e72019-05-26 10:08:28 +02004926 mbuf = br_tail(h2c->mbuf);
4927 retry:
4928 if (!h2_get_buf(h2c, mbuf)) {
4929 h2c->flags |= H2_CF_MUX_MALLOC;
4930 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004931 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 +02004932 return 0;
4933 }
4934
Willy Tarreau115e83b2018-12-01 19:17:53 +01004935 chunk_reset(&outbuf);
4936
4937 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004938 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4939 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004940 break;
4941 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004942 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004943 }
4944
4945 if (outbuf.size < 9)
4946 goto full;
4947
4948 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4949 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4950 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4951 outbuf.data = 9;
4952
4953 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004954 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004955 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004956 goto realign_again;
4957 goto full;
4958 }
4959
4960 /* encode all headers, stop at empty name */
4961 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4962 /* these ones do not exist in H2 and must be dropped. */
4963 if (isteq(list[hdr].n, ist("connection")) ||
4964 isteq(list[hdr].n, ist("proxy-connection")) ||
4965 isteq(list[hdr].n, ist("keep-alive")) ||
4966 isteq(list[hdr].n, ist("upgrade")) ||
4967 isteq(list[hdr].n, ist("transfer-encoding")))
4968 continue;
4969
Christopher Faulet86d144c2019-08-14 16:32:25 +02004970 /* Skip all pseudo-headers */
4971 if (*(list[hdr].n.ptr) == ':')
4972 continue;
4973
Willy Tarreau115e83b2018-12-01 19:17:53 +01004974 if (isteq(list[hdr].n, ist("")))
4975 break; // end
4976
4977 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4978 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004979 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004980 goto realign_again;
4981 goto full;
4982 }
4983 }
4984
Willy Tarreaucb985a42019-10-07 16:56:34 +02004985 /* update the frame's size */
4986 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4987
4988 if (outbuf.data > h2c->mfs + 9) {
4989 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
4990 /* output full */
4991 if (b_space_wraps(mbuf))
4992 goto realign_again;
4993 goto full;
4994 }
4995 }
4996
Christopher Faulet0b465482019-02-19 15:14:23 +01004997 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004998 * FIXME: we should also set it when we know for sure that the
4999 * content-length is zero as well as on 204/304
5000 */
Christopher Faulet0b465482019-02-19 15:14:23 +01005001 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
5002 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01005003 es_now = 1;
5004
Willy Tarreau927b88b2019-03-04 08:03:25 +01005005 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01005006 es_now = 1;
5007
Willy Tarreau115e83b2018-12-01 19:17:53 +01005008 if (es_now)
5009 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5010
5011 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005012 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005013 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01005014
5015 /* indicates the HEADERS frame was sent, except for 1xx responses. For
5016 * 1xx responses, another HEADERS frame is expected.
5017 */
5018 if (h2s->status >= 200 || h2s->status == 101)
5019 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005020
Willy Tarreau115e83b2018-12-01 19:17:53 +01005021 if (es_now) {
5022 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005023 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 +01005024 if (h2s->st == H2_SS_OPEN)
5025 h2s->st = H2_SS_HLOC;
5026 else
5027 h2s_close(h2s);
5028 }
5029
5030 /* OK we could properly deliver the response */
5031
5032 /* remove all header blocks including the EOH and compute the
5033 * corresponding size.
5034 *
5035 * FIXME: We should remove everything when es_now is set.
5036 */
5037 ret = 0;
5038 idx = htx_get_head(htx);
5039 blk = htx_get_blk(htx, idx);
5040 while (blk != blk_end) {
5041 ret += htx_get_blksz(blk);
5042 blk = htx_remove_blk(htx, blk);
5043 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01005044
Christopher Faulet316934d2019-05-15 14:22:48 +02005045 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5046 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01005047 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02005048 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01005049 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005050 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005051 return ret;
5052 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005053 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5054 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01005055 h2c->flags |= H2_CF_MUX_MFULL;
5056 h2s->flags |= H2_SF_BLK_MROOM;
5057 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005058 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 +01005059 goto end;
5060 fail:
5061 /* unparsable HTX messages, too large ones to be produced in the local
5062 * list etc go here (unrecoverable errors).
5063 */
5064 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5065 ret = 0;
5066 goto end;
5067}
5068
Willy Tarreau80739692018-10-05 11:35:57 +02005069/* Try to send a HEADERS frame matching HTX request present in HTX message
5070 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5071 * must check the stream's status to detect any error which might have happened
5072 * subsequently to a successful send. The htx blocks are automatically removed
5073 * from the message. The htx message is assumed to be valid since produced from
5074 * the internal code, hence it contains a start line, an optional series of
5075 * header blocks and an end of header, otherwise an invalid frame could be
5076 * emitted and the resulting htx message could be left in an inconsistent state.
5077 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005078static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02005079{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005080 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02005081 struct h2c *h2c = h2s->h2c;
5082 struct htx_blk *blk;
5083 struct htx_blk *blk_end;
5084 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005085 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02005086 struct htx_sl *sl;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005087 struct ist meth, uri, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02005088 enum htx_blk_type type;
5089 int es_now = 0;
5090 int ret = 0;
5091 int hdr;
5092 int idx;
5093
Willy Tarreau7838a792019-08-12 18:42:03 +02005094 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5095
Willy Tarreau80739692018-10-05 11:35:57 +02005096 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005097 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005098 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005099 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005100 return 0;
5101 }
5102
Willy Tarreau80739692018-10-05 11:35:57 +02005103 /* determine the first block which must not be deleted, blk_end may
5104 * be NULL if all blocks have to be deleted.
5105 */
5106 idx = htx_get_head(htx);
5107 blk_end = NULL;
5108 while (idx != -1) {
5109 type = htx_get_blk_type(htx_get_blk(htx, idx));
5110 idx = htx_get_next(htx, idx);
5111 if (type == HTX_BLK_EOH) {
5112 if (idx != -1)
5113 blk_end = htx_get_blk(htx, idx);
5114 break;
5115 }
5116 }
5117
5118 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02005119 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01005120 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02005121 ALREADY_CHECKED(blk);
5122 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02005123 meth = htx_sl_req_meth(sl);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005124 uri = htx_sl_req_uri(sl);
5125 if (unlikely(uri.len == 0)) {
5126 TRACE_PROTO("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5127 goto fail;
5128 }
Willy Tarreau80739692018-10-05 11:35:57 +02005129
5130 /* and the rest of the headers, that we dump starting at header 0 */
5131 hdr = 0;
5132
Willy Tarreau8e162ee2018-12-06 14:07:27 +01005133 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02005134 while ((idx = htx_get_next(htx, idx)) != -1) {
5135 blk = htx_get_blk(htx, idx);
5136 type = htx_get_blk_type(blk);
5137
5138 if (type == HTX_BLK_UNUSED)
5139 continue;
5140
5141 if (type != HTX_BLK_HDR)
5142 break;
5143
Willy Tarreau7838a792019-08-12 18:42:03 +02005144 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5145 TRACE_PROTO("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005146 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005147 }
Willy Tarreau80739692018-10-05 11:35:57 +02005148
5149 list[hdr].n = htx_get_blk_name(htx, blk);
5150 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02005151
5152 /* Skip header if same name is used to add the server name */
5153 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
5154 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
5155 continue;
5156
Willy Tarreau80739692018-10-05 11:35:57 +02005157 hdr++;
5158 }
5159
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02005160 /* Now add the server name to a header (if requested) */
5161 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
5162 struct server *srv = objt_server(h2c->conn->target);
5163
5164 if (srv) {
5165 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
5166 list[hdr].v = ist(srv->id);
5167 hdr++;
5168 }
5169 }
5170
Willy Tarreau80739692018-10-05 11:35:57 +02005171 /* marker for end of headers */
5172 list[hdr].n = ist("");
5173
Willy Tarreau9c218e72019-05-26 10:08:28 +02005174 mbuf = br_tail(h2c->mbuf);
5175 retry:
5176 if (!h2_get_buf(h2c, mbuf)) {
5177 h2c->flags |= H2_CF_MUX_MALLOC;
5178 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005179 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 +02005180 return 0;
5181 }
5182
Willy Tarreau80739692018-10-05 11:35:57 +02005183 chunk_reset(&outbuf);
5184
5185 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005186 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5187 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005188 break;
5189 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005190 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02005191 }
5192
5193 if (outbuf.size < 9)
5194 goto full;
5195
5196 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5197 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5198 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5199 outbuf.data = 9;
5200
5201 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005202 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005203 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005204 goto realign_again;
5205 goto full;
5206 }
5207
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005208 auth = ist(NULL);
5209
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005210 /* RFC7540 #8.3: the CONNECT method must have :
5211 * - :authority set to the URI part (host:port)
5212 * - :method set to CONNECT
5213 * - :scheme and :path omitted
5214 */
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005215 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT)) {
5216 auth = uri;
5217
5218 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5219 /* output full */
5220 if (b_space_wraps(mbuf))
5221 goto realign_again;
5222 goto full;
5223 }
5224 } else {
5225 /* other methods need a :scheme. If an authority is known from
5226 * the request line, it must be sent, otherwise only host is
5227 * sent. Host is never sent as the authority.
5228 */
5229 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005230
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005231 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5232 /* the URI seems to start with a scheme */
5233 int len = 1;
5234
5235 while (len < uri.len && uri.ptr[len] != ':')
5236 len++;
5237
5238 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5239 /* make the uri start at the authority now */
5240 scheme.ptr = uri.ptr;
Tim Duesterhus31871d22021-02-28 16:12:20 +01005241 scheme.len = len;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005242 uri.ptr += len + 3;
5243 uri.len -= len + 3;
5244
5245 /* find the auth part of the URI */
5246 auth.ptr = uri.ptr;
5247 auth.len = 0;
5248 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5249 auth.len++;
5250
5251 uri.ptr += auth.len;
5252 uri.len -= auth.len;
5253 }
5254 }
5255
5256 if (!scheme.len) {
5257 /* no explicit scheme, we're using an origin-form URI,
5258 * probably from an H1 request transcoded to H2 via an
5259 * external layer, then received as H2 without authority.
5260 * So we have to look up the scheme from the HTX flags.
5261 * In such a case only http and https are possible, and
5262 * https is the default (sent by browsers).
5263 */
5264 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5265 scheme = ist("http");
5266 else
5267 scheme = ist("https");
5268 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005269
5270 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005271 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005272 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005273 goto realign_again;
5274 goto full;
5275 }
Willy Tarreau80739692018-10-05 11:35:57 +02005276
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005277 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005278 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005279 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005280 goto realign_again;
5281 goto full;
5282 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005283
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005284 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5285 * be sent as '/' or '*'.
5286 */
5287 if (unlikely(!uri.len)) {
5288 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5289 uri = ist("*");
5290 else
5291 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005292 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005293
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005294 if (!hpack_encode_path(&outbuf, uri)) {
5295 /* output full */
5296 if (b_space_wraps(mbuf))
5297 goto realign_again;
5298 goto full;
5299 }
Willy Tarreau80739692018-10-05 11:35:57 +02005300 }
5301
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005302 /* encode all headers, stop at empty name. Host is only sent if we
5303 * do not provide an authority.
5304 */
Willy Tarreau80739692018-10-05 11:35:57 +02005305 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005306 struct ist n = list[hdr].n;
5307 struct ist v = list[hdr].v;
5308
Willy Tarreau80739692018-10-05 11:35:57 +02005309 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005310 if (isteq(n, ist("connection")) ||
5311 (auth.len && isteq(n, ist("host"))) ||
5312 isteq(n, ist("proxy-connection")) ||
5313 isteq(n, ist("keep-alive")) ||
5314 isteq(n, ist("upgrade")) ||
5315 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005316 continue;
5317
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005318 if (isteq(n, ist("te"))) {
5319 /* "te" may only be sent with "trailers" if this value
5320 * is present, otherwise it must be deleted.
5321 */
5322 v = istist(v, ist("trailers"));
5323 if (!v.ptr || (v.len > 8 && v.ptr[8] != ','))
5324 continue;
5325 v = ist("trailers");
5326 }
5327
Christopher Faulet86d144c2019-08-14 16:32:25 +02005328 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005329 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005330 continue;
5331
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005332 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005333 break; // end
5334
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005335 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005336 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005337 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005338 goto realign_again;
5339 goto full;
5340 }
5341 }
5342
Willy Tarreaucb985a42019-10-07 16:56:34 +02005343 /* update the frame's size */
5344 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5345
5346 if (outbuf.data > h2c->mfs + 9) {
5347 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5348 /* output full */
5349 if (b_space_wraps(mbuf))
5350 goto realign_again;
5351 goto full;
5352 }
5353 }
5354
Willy Tarreau80739692018-10-05 11:35:57 +02005355 /* we may need to add END_STREAM if we have no body :
5356 * - request already closed, or :
5357 * - no transfer-encoding, and :
5358 * - no content-length or content-length:0
5359 * Fixme: this doesn't take into account CONNECT requests.
5360 */
5361 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
5362 es_now = 1;
5363
5364 if (sl->flags & HTX_SL_F_BODYLESS)
5365 es_now = 1;
5366
Willy Tarreau927b88b2019-03-04 08:03:25 +01005367 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02005368 es_now = 1;
5369
Willy Tarreau80739692018-10-05 11:35:57 +02005370 if (es_now)
5371 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5372
5373 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005374 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005375 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005376 h2s->flags |= H2_SF_HEADERS_SENT;
5377 h2s->st = H2_SS_OPEN;
5378
Willy Tarreau80739692018-10-05 11:35:57 +02005379 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005380 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 +02005381 // trim any possibly pending data (eg: inconsistent content-length)
5382 h2s->flags |= H2_SF_ES_SENT;
5383 h2s->st = H2_SS_HLOC;
5384 }
5385
5386 /* remove all header blocks including the EOH and compute the
5387 * corresponding size.
5388 *
5389 * FIXME: We should remove everything when es_now is set.
5390 */
5391 ret = 0;
5392 idx = htx_get_head(htx);
5393 blk = htx_get_blk(htx, idx);
5394 while (blk != blk_end) {
5395 ret += htx_get_blksz(blk);
5396 blk = htx_remove_blk(htx, blk);
5397 }
5398
Christopher Faulet316934d2019-05-15 14:22:48 +02005399 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5400 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02005401 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02005402 }
Willy Tarreau80739692018-10-05 11:35:57 +02005403
5404 end:
5405 return ret;
5406 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005407 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5408 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005409 h2c->flags |= H2_CF_MUX_MFULL;
5410 h2s->flags |= H2_SF_BLK_MROOM;
5411 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005412 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 +02005413 goto end;
5414 fail:
5415 /* unparsable HTX messages, too large ones to be produced in the local
5416 * list etc go here (unrecoverable errors).
5417 */
5418 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5419 ret = 0;
5420 goto end;
5421}
5422
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005423/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005424 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5425 * caller must check the stream's status to detect any error which might have
5426 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02005427 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005428 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005429static size_t h2s_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005430{
5431 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005432 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005433 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005434 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005435 size_t total = 0;
5436 int es_now = 0;
5437 int bsize; /* htx block size */
5438 int fsize; /* h2 frame size */
5439 struct htx_blk *blk;
5440 enum htx_blk_type type;
5441 int idx;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005442 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005443
Willy Tarreau7838a792019-08-12 18:42:03 +02005444 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5445
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005446 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005447 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005448 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005449 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005450 goto end;
5451 }
5452
Willy Tarreau98de12a2018-12-12 07:03:00 +01005453 htx = htx_from_buf(buf);
5454
Christopher Faulet54b5e212019-06-04 10:08:28 +02005455 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
5456 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
5457 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005458 */
5459
5460 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005461 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005462 goto end;
5463
5464 idx = htx_get_head(htx);
5465 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02005466 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005467 bsize = htx_get_blksz(blk);
5468 fsize = bsize;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005469 trunc_out = 0;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005470
Christopher Faulet54b5e212019-06-04 10:08:28 +02005471 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01005472 if (h2s->flags & H2_SF_ES_SENT) {
5473 /* ES already sent */
5474 htx_remove_blk(htx, blk);
5475 total++; // EOM counts as one byte
5476 count--;
5477 goto end;
5478 }
5479 }
5480 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005481 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005482
Willy Tarreau9c218e72019-05-26 10:08:28 +02005483 mbuf = br_tail(h2c->mbuf);
5484 retry:
5485 if (!h2_get_buf(h2c, mbuf)) {
5486 h2c->flags |= H2_CF_MUX_MALLOC;
5487 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005488 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 +02005489 goto end;
5490 }
5491
Willy Tarreau98de12a2018-12-12 07:03:00 +01005492 /* Perform some optimizations to reduce the number of buffer copies.
5493 * First, if the mux's buffer is empty and the htx area contains
5494 * exactly one data block of the same size as the requested count, and
5495 * this count fits within the frame size, the stream's window size, and
5496 * the connection's window size, then it's possible to simply swap the
5497 * caller's buffer with the mux's output buffer and adjust offsets and
5498 * length to match the entire DATA HTX block in the middle. In this
5499 * case we perform a true zero-copy operation from end-to-end. This is
5500 * the situation that happens all the time with large files. Second, if
5501 * this is not possible, but the mux's output buffer is empty, we still
5502 * have an opportunity to avoid the copy to the intermediary buffer, by
5503 * making the intermediary buffer's area point to the output buffer's
5504 * area. In this case we want to skip the HTX header to make sure that
5505 * copies remain aligned and that this operation remains possible all
5506 * the time. This goes for headers, data blocks and any data extracted
5507 * from the HTX blocks.
5508 */
5509 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005510 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005511 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005512 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005513
Willy Tarreaubcc45952019-05-26 10:05:50 +02005514 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005515 /* Too bad there are data left there. We're willing to memcpy/memmove
5516 * up to 1/4 of the buffer, which means that it's OK to copy a large
5517 * frame into a buffer containing few data if it needs to be realigned,
5518 * and that it's also OK to copy few data without realigning. Otherwise
5519 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005520 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005521 if (fsize + 9 <= b_room(mbuf) &&
5522 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005523 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5524 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 +01005525 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005526 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005527
Willy Tarreau9c218e72019-05-26 10:08:28 +02005528 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5529 goto retry;
5530
Willy Tarreau98de12a2018-12-12 07:03:00 +01005531 h2c->flags |= H2_CF_MUX_MFULL;
5532 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005533 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 +01005534 goto end;
5535 }
5536
5537 /* map an H2 frame to the HTX block so that we can put the
5538 * frame header there.
5539 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005540 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5541 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005542
5543 /* prepend an H2 DATA frame header just before the DATA block */
5544 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5545 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5546 h2_set_frame_size(outbuf.area, fsize);
5547
5548 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005549 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005550 h2c->mws -= fsize;
5551
5552 /* and exchange with our old area */
5553 buf->area = old_area;
5554 buf->data = buf->head = 0;
5555 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005556
5557 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 +01005558 goto end;
5559 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005560
Willy Tarreau98de12a2018-12-12 07:03:00 +01005561 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005562 /* for DATA and EOM we'll have to emit a frame, even if empty */
5563
5564 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005565 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5566 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005567 break;
5568 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005569 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005570 }
5571
5572 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005573 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5574 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005575 h2c->flags |= H2_CF_MUX_MFULL;
5576 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005577 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005578 goto end;
5579 }
5580
5581 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5582 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5583 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5584 outbuf.data = 9;
5585
5586 /* we have in <fsize> the exact number of bytes we need to copy from
5587 * the HTX buffer. We need to check this against the connection's and
5588 * the stream's send windows, and to ensure that this fits in the max
5589 * frame size and in the buffer's available space minus 9 bytes (for
5590 * the frame header). The connection's flow control is applied last so
5591 * that we can use a separate list of streams which are immediately
5592 * unblocked on window opening. Note: we don't implement padding.
5593 */
5594
5595 /* EOM is presented with bsize==1 but would lead to the emission of an
5596 * empty frame, thus we force it to zero here.
5597 */
5598 if (type == HTX_BLK_EOM)
5599 bsize = fsize = 0;
5600
5601 if (!fsize)
5602 goto send_empty;
5603
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005604 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005605 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005606 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005607 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005608 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005609 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 +01005610 goto end;
5611 }
5612
Willy Tarreauee573762018-12-04 15:25:57 +01005613 if (fsize > count)
5614 fsize = count;
5615
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005616 if (fsize > h2s_mws(h2s))
5617 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005618
5619 if (h2c->mfs && fsize > h2c->mfs)
5620 fsize = h2c->mfs; // >0
5621
5622 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005623 /* It doesn't fit at once. If it at least fits once split and
5624 * the amount of data to move is low, let's defragment the
5625 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005626 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005627 if (b_space_wraps(mbuf) &&
5628 (fsize + 9 <= b_room(mbuf)) &&
5629 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005630 goto realign_again;
5631 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005632 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005633
5634 if (fsize <= 0) {
5635 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005636 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5637 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005638 h2c->flags |= H2_CF_MUX_MFULL;
5639 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005640 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005641 goto end;
5642 }
5643 }
5644
5645 if (h2c->mws <= 0) {
5646 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005647 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 +01005648 goto end;
5649 }
5650
5651 if (fsize > h2c->mws)
5652 fsize = h2c->mws;
5653
5654 /* now let's copy this this into the output buffer */
5655 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005656 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005657 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005658 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005659
5660 send_empty:
5661 /* update the frame's size */
5662 h2_set_frame_size(outbuf.area, fsize);
5663
5664 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5665 * meeting EOM. We should optimize this later.
5666 */
5667 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005668 total++; // EOM counts as one byte
5669 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005670 es_now = 1;
5671 }
5672
5673 if (es_now)
5674 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5675
5676 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005677 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005678
5679 /* consume incoming HTX block, including EOM */
5680 total += fsize;
5681 if (fsize == bsize) {
5682 htx_remove_blk(htx, blk);
Willy Tarreau7838a792019-08-12 18:42:03 +02005683 if (fsize) {
5684 TRACE_DEVEL("more data available, trying to send another frame", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005685 goto new_frame;
Willy Tarreau7838a792019-08-12 18:42:03 +02005686 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005687 } else {
5688 /* we've truncated this block */
5689 htx_cut_data_blk(htx, blk, fsize);
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005690 if (trunc_out)
5691 goto new_frame;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005692 }
5693
5694 if (es_now) {
5695 if (h2s->st == H2_SS_OPEN)
5696 h2s->st = H2_SS_HLOC;
5697 else
5698 h2s_close(h2s);
5699
5700 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005701 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 +01005702 }
5703
5704 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005705 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005706 return total;
5707}
5708
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005709/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5710 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5711 * processed. The caller must check the stream's status to detect any error
5712 * which might have happened subsequently to a successful send. The htx blocks
5713 * are automatically removed from the message. The htx message is assumed to be
5714 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005715 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005716 * as a single frame. The ES flag is always set.
5717 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005718static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005719{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005720 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005721 struct h2c *h2c = h2s->h2c;
5722 struct htx_blk *blk;
5723 struct htx_blk *blk_end;
5724 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005725 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005726 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005727 int ret = 0;
5728 int hdr;
5729 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005730
Willy Tarreau7838a792019-08-12 18:42:03 +02005731 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5732
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005733 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005734 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005735 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005736 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005737 goto end;
5738 }
5739
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005740 /* determine the first block which must not be deleted, blk_end may
5741 * be NULL if all blocks have to be deleted. also get trailers.
5742 */
5743 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005744 blk_end = NULL;
5745
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005746 hdr = 0;
5747 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005748 blk = htx_get_blk(htx, idx);
5749 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005750 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005751 if (type == HTX_BLK_UNUSED)
5752 continue;
5753
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005754 if (type == HTX_BLK_EOT) {
5755 if (idx != -1)
5756 blk_end = blk;
5757 break;
5758 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005759 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005760 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005761
Willy Tarreau7838a792019-08-12 18:42:03 +02005762 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5763 TRACE_PROTO("too many headers", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005764 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005765 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005766
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005767 list[hdr].n = htx_get_blk_name(htx, blk);
5768 list[hdr].v = htx_get_blk_value(htx, blk);
5769 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005770 }
5771
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005772 /* marker for end of trailers */
5773 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005774
Willy Tarreau9c218e72019-05-26 10:08:28 +02005775 mbuf = br_tail(h2c->mbuf);
5776 retry:
5777 if (!h2_get_buf(h2c, mbuf)) {
5778 h2c->flags |= H2_CF_MUX_MALLOC;
5779 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005780 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 +02005781 goto end;
5782 }
5783
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005784 chunk_reset(&outbuf);
5785
5786 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005787 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5788 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005789 break;
5790 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005791 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005792 }
5793
5794 if (outbuf.size < 9)
5795 goto full;
5796
5797 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5798 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5799 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5800 outbuf.data = 9;
5801
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005802 /* encode all headers */
5803 for (idx = 0; idx < hdr; idx++) {
5804 /* these ones do not exist in H2 or must not appear in
5805 * trailers and must be dropped.
5806 */
5807 if (isteq(list[idx].n, ist("host")) ||
5808 isteq(list[idx].n, ist("content-length")) ||
5809 isteq(list[idx].n, ist("connection")) ||
5810 isteq(list[idx].n, ist("proxy-connection")) ||
5811 isteq(list[idx].n, ist("keep-alive")) ||
5812 isteq(list[idx].n, ist("upgrade")) ||
5813 isteq(list[idx].n, ist("te")) ||
5814 isteq(list[idx].n, ist("transfer-encoding")))
5815 continue;
5816
Christopher Faulet86d144c2019-08-14 16:32:25 +02005817 /* Skip all pseudo-headers */
5818 if (*(list[idx].n.ptr) == ':')
5819 continue;
5820
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005821 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5822 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005823 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005824 goto realign_again;
5825 goto full;
5826 }
5827 }
5828
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005829 if (outbuf.data == 9) {
5830 /* here we have a problem, we have nothing to emit (either we
5831 * received an empty trailers block followed or we removed its
5832 * contents above). Because of this we can't send a HEADERS
5833 * frame, so we have to cheat and instead send an empty DATA
5834 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005835 */
5836 outbuf.area[3] = H2_FT_DATA;
5837 outbuf.area[4] = H2_F_DATA_END_STREAM;
5838 }
5839
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005840 /* update the frame's size */
5841 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5842
Willy Tarreau572d9f52019-10-11 16:58:37 +02005843 if (outbuf.data > h2c->mfs + 9) {
5844 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5845 /* output full */
5846 if (b_space_wraps(mbuf))
5847 goto realign_again;
5848 goto full;
5849 }
5850 }
5851
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005852 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005853 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 +02005854 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005855 h2s->flags |= H2_SF_ES_SENT;
5856
5857 if (h2s->st == H2_SS_OPEN)
5858 h2s->st = H2_SS_HLOC;
5859 else
5860 h2s_close(h2s);
5861
5862 /* OK we could properly deliver the response */
5863 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005864 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005865 ret = 0;
5866 idx = htx_get_head(htx);
5867 blk = htx_get_blk(htx, idx);
5868 while (blk != blk_end) {
5869 ret += htx_get_blksz(blk);
5870 blk = htx_remove_blk(htx, blk);
5871 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005872
5873 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5874 ret += htx_get_blksz(blk_end);
5875 htx_remove_blk(htx, blk_end);
5876 }
5877
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005878 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005879 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005880 return ret;
5881 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005882 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5883 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005884 h2c->flags |= H2_CF_MUX_MFULL;
5885 h2s->flags |= H2_SF_BLK_MROOM;
5886 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005887 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 +01005888 goto end;
5889 fail:
5890 /* unparsable HTX messages, too large ones to be produced in the local
5891 * list etc go here (unrecoverable errors).
5892 */
5893 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5894 ret = 0;
5895 goto end;
5896}
5897
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005898/* Called from the upper layer, to subscribe <es> to events <event_type>. The
5899 * event subscriber <es> is not allowed to change from a previous call as long
5900 * as at least one event is still subscribed. The <event_type> must only be a
5901 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005902 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005903static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02005904{
Olivier Houchard6ff20392018-07-17 18:46:31 +02005905 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005906 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005907
Willy Tarreau7838a792019-08-12 18:42:03 +02005908 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005909
5910 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005911 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005912
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005913 es->events |= event_type;
5914 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005915
5916 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005917 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005918
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005919 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005920 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02005921 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5922 !LIST_ADDED(&h2s->list)) {
5923 if (h2s->flags & H2_SF_BLK_MFCTL)
5924 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5925 else
5926 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005927 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02005928 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005929 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005930 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005931}
5932
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005933/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
5934 * The <es> pointer is not allowed to differ from the one passed to the
5935 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005936 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005937static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005938{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005939 struct h2s *h2s = cs->ctx;
5940
Willy Tarreau7838a792019-08-12 18:42:03 +02005941 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005942
5943 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005944 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005945
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005946 es->events &= ~event_type;
5947 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01005948 h2s->subs = NULL;
5949
5950 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005951 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005952
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005953 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005954 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005955 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005956 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
5957 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005958 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01005959
Willy Tarreau7838a792019-08-12 18:42:03 +02005960 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005961 return 0;
5962}
5963
5964
Olivier Houchard511efea2018-08-16 15:30:32 +02005965/* Called from the upper layer, to receive data */
5966static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5967{
Olivier Houchard638b7992018-08-16 15:41:52 +02005968 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005969 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005970 struct htx *h2s_htx = NULL;
5971 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005972 size_t ret = 0;
5973
Willy Tarreau7838a792019-08-12 18:42:03 +02005974 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
5975
Olivier Houchard511efea2018-08-16 15:30:32 +02005976 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005977 h2s_htx = htx_from_buf(&h2s->rxbuf);
5978 if (htx_is_empty(h2s_htx)) {
5979 /* Here htx_to_buf() will set buffer data to 0 because
5980 * the HTX is empty.
5981 */
5982 htx_to_buf(h2s_htx, &h2s->rxbuf);
5983 goto end;
5984 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005985
Christopher Faulet9b79a102019-07-15 11:22:56 +02005986 ret = h2s_htx->data;
5987 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005988
Christopher Faulet9b79a102019-07-15 11:22:56 +02005989 /* <buf> is empty and the message is small enough, swap the
5990 * buffers. */
5991 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005992 htx_to_buf(buf_htx, buf);
5993 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02005994 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5995 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01005996 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02005997
5998 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
5999
6000 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
6001 buf_htx->flags |= HTX_FL_PARSING_ERROR;
6002 if (htx_is_empty(buf_htx))
6003 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01006004 }
Christopher Faulet810df062020-07-22 16:20:34 +02006005 else if (htx_is_empty(h2s_htx))
6006 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOI);
Olivier Houchard511efea2018-08-16 15:30:32 +02006007
Christopher Faulet9b79a102019-07-15 11:22:56 +02006008 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
6009 htx_to_buf(buf_htx, buf);
6010 htx_to_buf(h2s_htx, &h2s->rxbuf);
6011 ret -= h2s_htx->data;
6012
Christopher Faulet37070b22019-02-14 15:12:14 +01006013 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02006014 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01006015 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02006016 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01006017 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02006018 if (h2s->flags & H2_SF_ES_RCVD)
6019 cs->flags |= CS_FL_EOI;
Christopher Fauletaade4ed2020-10-08 15:38:41 +02006020 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02006021 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01006022 if (cs->flags & CS_FL_ERR_PENDING)
6023 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02006024 if (b_size(&h2s->rxbuf)) {
6025 b_free(&h2s->rxbuf);
Willy Tarreau132b3a42021-02-20 12:02:46 +01006026 offer_buffers(NULL, 1);
Olivier Houchard638b7992018-08-16 15:41:52 +02006027 }
Olivier Houchard511efea2018-08-16 15:30:32 +02006028 }
6029
Willy Tarreau082f5592018-11-25 08:03:32 +01006030 if (ret && h2c->dsi == h2s->id) {
6031 /* demux is blocking on this stream's buffer */
6032 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02006033 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01006034 }
Christopher Faulet37070b22019-02-14 15:12:14 +01006035
Willy Tarreau7838a792019-08-12 18:42:03 +02006036 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02006037 return ret;
6038}
6039
Olivier Houchardd846c262018-10-19 17:24:29 +02006040
Willy Tarreau749f5ca2019-03-21 19:19:36 +01006041/* Called from the upper layer, to send data from buffer <buf> for no more than
6042 * <count> bytes. Returns the number of bytes effectively sent. Some status
6043 * flags may be updated on the conn_stream.
6044 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02006045static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02006046{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006047 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02006048 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02006049 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006050 struct htx *htx;
6051 struct htx_blk *blk;
6052 enum htx_blk_type btype;
6053 uint32_t bsize;
6054 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006055
Willy Tarreau7838a792019-08-12 18:42:03 +02006056 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
6057
Olivier Houchardd360ac62019-03-22 17:37:16 +01006058 /* If we were not just woken because we wanted to send but couldn't,
6059 * and there's somebody else that is waiting to send, do nothing,
6060 * we will subscribe later and be put at the end of the list
6061 */
Willy Tarreaud9464162020-01-10 18:25:07 +01006062 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02006063 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
6064 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 +01006065 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006066 }
Willy Tarreaud9464162020-01-10 18:25:07 +01006067 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02006068
Willy Tarreau7838a792019-08-12 18:42:03 +02006069 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
6070 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 +02006071 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006072 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006073
Willy Tarreaucab22952019-10-31 15:48:18 +01006074 if (h2s->h2c->st0 >= H2_CS_ERROR) {
6075 cs->flags |= CS_FL_ERROR;
6076 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);
6077 return 0;
6078 }
6079
Christopher Faulet9b79a102019-07-15 11:22:56 +02006080 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006081
Willy Tarreau0bad0432018-06-14 16:54:01 +02006082 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01006083 h2s->flags |= H2_SF_OUTGOING_DATA;
6084
Willy Tarreau751f2d02018-10-05 09:35:00 +02006085 if (h2s->id == 0) {
6086 int32_t id = h2c_get_next_sid(h2s->h2c);
6087
6088 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02006089 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02006090 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 +02006091 return 0;
6092 }
6093
6094 eb32_delete(&h2s->by_id);
6095 h2s->by_id.key = h2s->id = id;
6096 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01006097 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02006098 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
6099 }
6100
Christopher Faulet9b79a102019-07-15 11:22:56 +02006101 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
6102 count && !htx_is_empty(htx)) {
6103 idx = htx_get_head(htx);
6104 blk = htx_get_blk(htx, idx);
6105 btype = htx_get_blk_type(blk);
6106 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006107
Christopher Faulet9b79a102019-07-15 11:22:56 +02006108 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02006109 case HTX_BLK_REQ_SL:
6110 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006111 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02006112 if (ret > 0) {
6113 total += ret;
6114 count -= ret;
6115 if (ret < bsize)
6116 goto done;
6117 }
6118 break;
6119
Willy Tarreau115e83b2018-12-01 19:17:53 +01006120 case HTX_BLK_RES_SL:
6121 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006122 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01006123 if (ret > 0) {
6124 total += ret;
6125 count -= ret;
6126 if (ret < bsize)
6127 goto done;
6128 }
6129 break;
6130
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006131 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006132 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006133 /* all these cause the emission of a DATA frame (possibly empty).
6134 * This EOM necessarily is one before trailers, as the EOM following
6135 * trailers would have been consumed by the trailers parser.
6136 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006137 ret = h2s_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006138 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01006139 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006140 total += ret;
6141 count -= ret;
6142 if (ret < bsize)
6143 goto done;
6144 }
6145 break;
6146
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006147 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006148 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006149 /* This is the first trailers block, all the subsequent ones AND
6150 * the EOM will be swallowed by the parser.
6151 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006152 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006153 if (ret > 0) {
6154 total += ret;
6155 count -= ret;
6156 if (ret < bsize)
6157 goto done;
6158 }
6159 break;
6160
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006161 default:
6162 htx_remove_blk(htx, blk);
6163 total += bsize;
6164 count -= bsize;
6165 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006166 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006167 }
6168
Christopher Faulet9b79a102019-07-15 11:22:56 +02006169 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02006170 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02006171 /* trim any possibly pending data after we close (extra CR-LF,
6172 * unprocessed trailers, abnormal extra data, ...)
6173 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02006174 total += count;
6175 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02006176 }
6177
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006178 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01006179 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006180 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 +01006181 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01006182 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01006183 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006184 }
6185
Christopher Faulet9b79a102019-07-15 11:22:56 +02006186 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02006187
Olivier Houchard7505f942018-08-21 18:10:44 +02006188 if (total > 0) {
Tim Duesterhus6dca1442020-12-21 19:40:16 +01006189 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006190 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 +02006191 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Tim Duesterhus6dca1442020-12-21 19:40:16 +01006192 }
Olivier Houchardd846c262018-10-19 17:24:29 +02006193
Olivier Houchard7505f942018-08-21 18:10:44 +02006194 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006195 /* If we're waiting for flow control, and we got a shutr on the
6196 * connection, we will never be unlocked, so add an error on
6197 * the conn_stream.
6198 */
6199 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
6200 !b_data(&h2s->h2c->dbuf) &&
6201 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006202 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 +01006203 if (cs->flags & CS_FL_EOS)
6204 cs->flags |= CS_FL_ERROR;
6205 else
6206 cs->flags |= CS_FL_ERR_PENDING;
6207 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006208
Willy Tarreau5723f292020-01-10 15:16:57 +01006209 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6210 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006211 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006212 LIST_DEL_INIT(&h2s->list);
6213 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006214
Willy Tarreau7838a792019-08-12 18:42:03 +02006215 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006216 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006217}
6218
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006219/* for debugging with CLI's "show fd" command */
Willy Tarreau6cb467e2021-01-21 08:26:06 +01006220static int h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006221{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006222 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006223 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006224 struct eb32_node *node;
6225 int fctl_cnt = 0;
6226 int send_cnt = 0;
6227 int tree_cnt = 0;
6228 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006229 struct buffer *hmbuf, *tmbuf;
Willy Tarreauc4615c62021-01-21 09:13:35 +01006230 int ret = 0;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006231
6232 if (!h2c)
Willy Tarreauc4615c62021-01-21 09:13:35 +01006233 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006234
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006235 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006236 fctl_cnt++;
6237
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006238 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006239 send_cnt++;
6240
Willy Tarreau3af37712018-12-18 14:34:41 +01006241 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006242 node = eb32_first(&h2c->streams_by_id);
6243 while (node) {
6244 h2s = container_of(node, struct h2s, by_id);
6245 tree_cnt++;
6246 if (!h2s->cs)
6247 orph_cnt++;
6248 node = eb32_next(node);
6249 }
6250
Willy Tarreau60f62682019-05-26 11:32:27 +02006251 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006252 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006253 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006254 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006255 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6256 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006257 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006258 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006259 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006260 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6261 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6262 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006263 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6264 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6265 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006266 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6267 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006268
6269 if (h2s) {
Willy Tarreau1c694692021-01-20 15:50:03 +01006270 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 +02006271 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006272 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6273 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6274 h2s->cs);
6275 if (h2s->cs)
Willy Tarreaua09db382021-01-20 16:27:01 +01006276 chunk_appendf(msg, "(.flg=0x%08x .data=%p)",
Willy Tarreau987c0632018-12-18 10:32:05 +01006277 h2s->cs->flags, h2s->cs->data);
Willy Tarreaua09db382021-01-20 16:27:01 +01006278
6279 chunk_appendf(&trash, " .subs=%p", h2s->subs);
6280 if (h2s->subs) {
Christopher Faulet70da1072021-02-25 10:06:29 +01006281 chunk_appendf(&trash, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet);
6282 chunk_appendf(&trash, " tl.calls=%d tl.ctx=%p tl.fct=",
6283 h2s->subs->tasklet->calls,
6284 h2s->subs->tasklet->context);
6285 if (h2s->subs->tasklet->calls >= 1000000)
6286 ret = 1;
6287 resolve_sym_name(&trash, NULL, h2s->subs->tasklet->process);
6288 chunk_appendf(&trash, ")");
Willy Tarreaua09db382021-01-20 16:27:01 +01006289 }
Willy Tarreau987c0632018-12-18 10:32:05 +01006290 }
Willy Tarreauc4615c62021-01-21 09:13:35 +01006291 return ret;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006292}
Willy Tarreau62f52692017-10-08 23:01:42 +02006293
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006294/* Migrate the the connection to the current thread.
6295 * Return 0 if successful, non-zero otherwise.
6296 * Expected to be called with the old thread lock held.
6297 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006298static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006299{
6300 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006301 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006302
6303 if (fd_takeover(conn->handle.fd, conn) != 0)
6304 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006305
6306 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6307 /* We failed to takeover the xprt, even if the connection may
6308 * still be valid, flag it as error'd, as we have already
6309 * taken over the fd, and wake the tasklet, so that it will
6310 * destroy it.
6311 */
6312 conn->flags |= CO_FL_ERROR;
6313 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6314 return -1;
6315 }
6316
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006317 if (h2c->wait_event.events)
6318 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6319 h2c->wait_event.events, &h2c->wait_event);
6320 /* To let the tasklet know it should free itself, and do nothing else,
6321 * set its context to NULL.
6322 */
6323 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006324 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006325
6326 task = h2c->task;
6327 if (task) {
6328 task->context = NULL;
6329 h2c->task = NULL;
6330 __ha_barrier_store();
6331 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006332
6333 h2c->task = task_new(tid_bit);
6334 if (!h2c->task) {
6335 h2_release(h2c);
6336 return -1;
6337 }
6338 h2c->task->process = h2_timeout_task;
6339 h2c->task->context = h2c;
6340 }
6341 h2c->wait_event.tasklet = tasklet_new();
6342 if (!h2c->wait_event.tasklet) {
6343 h2_release(h2c);
6344 return -1;
6345 }
6346 h2c->wait_event.tasklet->process = h2_io_cb;
6347 h2c->wait_event.tasklet->context = h2c;
6348 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6349 SUB_RETRY_RECV, &h2c->wait_event);
6350
6351 return 0;
6352}
6353
Willy Tarreau62f52692017-10-08 23:01:42 +02006354/*******************************************************/
6355/* functions below are dedicated to the config parsers */
6356/*******************************************************/
6357
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006358/* config parser for global "tune.h2.header-table-size" */
6359static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
6360 struct proxy *defpx, const char *file, int line,
6361 char **err)
6362{
6363 if (too_many_args(1, args, err, NULL))
6364 return -1;
6365
6366 h2_settings_header_table_size = atoi(args[1]);
6367 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6368 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6369 return -1;
6370 }
6371 return 0;
6372}
Willy Tarreau62f52692017-10-08 23:01:42 +02006373
Willy Tarreaue6baec02017-07-27 11:45:11 +02006374/* config parser for global "tune.h2.initial-window-size" */
6375static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
6376 struct proxy *defpx, const char *file, int line,
6377 char **err)
6378{
6379 if (too_many_args(1, args, err, NULL))
6380 return -1;
6381
6382 h2_settings_initial_window_size = atoi(args[1]);
6383 if (h2_settings_initial_window_size < 0) {
6384 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6385 return -1;
6386 }
6387 return 0;
6388}
6389
Willy Tarreau5242ef82017-07-27 11:47:28 +02006390/* config parser for global "tune.h2.max-concurrent-streams" */
6391static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
6392 struct proxy *defpx, const char *file, int line,
6393 char **err)
6394{
6395 if (too_many_args(1, args, err, NULL))
6396 return -1;
6397
6398 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006399 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006400 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6401 return -1;
6402 }
6403 return 0;
6404}
6405
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006406/* config parser for global "tune.h2.max-frame-size" */
6407static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
6408 struct proxy *defpx, const char *file, int line,
6409 char **err)
6410{
6411 if (too_many_args(1, args, err, NULL))
6412 return -1;
6413
6414 h2_settings_max_frame_size = atoi(args[1]);
6415 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6416 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6417 return -1;
6418 }
6419 return 0;
6420}
6421
Willy Tarreau62f52692017-10-08 23:01:42 +02006422
6423/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006424/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006425/***************************************/
6426
6427/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006428static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006429 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006430 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006431 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006432 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006433 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006434 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006435 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006436 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006437 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006438 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006439 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006440 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006441 .shutr = h2_shutr,
6442 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006443 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006444 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006445 .takeover = h2_takeover,
Amaury Denoyelle3d3c0912020-10-14 18:17:06 +02006446 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK,
Willy Tarreau62f52692017-10-08 23:01:42 +02006447 .name = "H2",
6448};
6449
Christopher Faulet32f61c02018-04-10 14:33:41 +02006450static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006451 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006452
Willy Tarreau0108d902018-11-25 19:14:37 +01006453INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6454
Willy Tarreau62f52692017-10-08 23:01:42 +02006455/* config keyword parsers */
6456static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006457 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006458 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006459 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006460 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006461 { 0, NULL, NULL }
6462}};
6463
Willy Tarreau0108d902018-11-25 19:14:37 +01006464INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006465
6466/* initialize internal structs after the config is parsed.
6467 * Returns zero on success, non-zero on error.
6468 */
6469static int init_h2()
6470{
6471 pool_head_hpack_tbl = create_pool("hpack_tbl",
6472 h2_settings_header_table_size,
6473 MEM_F_SHARED|MEM_F_EXACT);
Christopher Fauletd713bfb2020-11-06 15:23:39 +01006474 if (!pool_head_hpack_tbl) {
6475 ha_alert("failed to allocate hpack_tbl memory pool\n");
6476 return (ERR_ALERT | ERR_FATAL);
6477 }
6478 return ERR_NONE;
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006479}
6480
6481REGISTER_POST_CHECK(init_h2);