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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 Tarreau97aaa672018-12-23 09:49:04 +010067#define H2_CF_WINDOW_OPENED 0x00010000 // demux increased window already advertised
Willy Tarreau081d4722017-05-16 21:51:05 +020068
Willy Tarreau5ab6b572017-09-22 08:05:00 +020069/* H2 connection state, in h2c->st0 */
70enum h2_cs {
71 H2_CS_PREFACE, // init done, waiting for connection preface
72 H2_CS_SETTINGS1, // preface OK, waiting for first settings frame
73 H2_CS_FRAME_H, // first settings frame ok, waiting for frame header
74 H2_CS_FRAME_P, // frame header OK, waiting for frame payload
Willy Tarreaua20a5192017-12-27 11:02:06 +010075 H2_CS_FRAME_A, // frame payload OK, trying to send ACK frame
76 H2_CS_FRAME_E, // frame payload OK, trying to send RST frame
Willy Tarreau5ab6b572017-09-22 08:05:00 +020077 H2_CS_ERROR, // send GOAWAY(errcode) and close the connection ASAP
78 H2_CS_ERROR2, // GOAWAY(errcode) sent, close the connection ASAP
79 H2_CS_ENTRIES // must be last
80} __attribute__((packed));
81
Willy Tarreau51330962019-05-26 09:38:07 +020082
Willy Tarreau9c218e72019-05-26 10:08:28 +020083/* 32 buffers: one for the ring's root, rest for the mbuf itself */
84#define H2C_MBUF_CNT 32
Willy Tarreau51330962019-05-26 09:38:07 +020085
Willy Tarreau5ab6b572017-09-22 08:05:00 +020086/* H2 connection descriptor */
87struct h2c {
88 struct connection *conn;
89
90 enum h2_cs st0; /* mux state */
91 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
92
93 /* 16 bit hole here */
94 uint32_t flags; /* connection flags: H2_CF_* */
Willy Tarreau2e2083a2019-01-31 10:34:07 +010095 uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
Willy Tarreau5ab6b572017-09-22 08:05:00 +020096 int32_t max_id; /* highest ID known on this connection, <0 before preface */
97 uint32_t rcvd_c; /* newly received data to ACK for the connection */
98 uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) */
99
100 /* states for the demux direction */
101 struct hpack_dht *ddht; /* demux dynamic header table */
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200102 struct buffer dbuf; /* demux buffer */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200103
104 int32_t dsi; /* demux stream ID (<0 = idle) */
105 int32_t dfl; /* demux frame length (if dsi >= 0) */
106 int8_t dft; /* demux frame type (if dsi >= 0) */
107 int8_t dff; /* demux frame flags (if dsi >= 0) */
Willy Tarreau05e5daf2017-12-11 15:17:36 +0100108 uint8_t dpl; /* demux pad length (part of dfl), init to 0 */
109 /* 8 bit hole here */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200110 int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */
111
112 /* states for the mux direction */
Willy Tarreau51330962019-05-26 09:38:07 +0200113 struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200114 int32_t msi; /* mux stream ID (<0 = idle) */
115 int32_t mfl; /* mux frame length (if dsi >= 0) */
116 int8_t mft; /* mux frame type (if dsi >= 0) */
117 int8_t mff; /* mux frame flags (if dsi >= 0) */
118 /* 16 bit hole here */
119 int32_t miw; /* mux initial window size for all new streams */
120 int32_t mws; /* mux window size. Can be negative. */
121 int32_t mfs; /* mux's max frame size */
122
Willy Tarreauea392822017-10-31 10:02:25 +0100123 int timeout; /* idle timeout duration in ticks */
Willy Tarreau599391a2017-11-24 10:16:00 +0100124 int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */
Willy Tarreau49745612017-12-03 18:56:02 +0100125 unsigned int nb_streams; /* number of streams in the tree */
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200126 unsigned int nb_cs; /* number of attached conn_streams */
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100127 unsigned int nb_reserved; /* number of reserved streams */
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100128 unsigned int stream_cnt; /* total number of streams seen */
Willy Tarreau0b37d652018-10-03 10:33:02 +0200129 struct proxy *proxy; /* the proxy this connection was created for */
Willy Tarreauea392822017-10-31 10:02:25 +0100130 struct task *task; /* timeout management task */
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100131 struct h2_counters *px_counters; /* h2 counters attached to proxy */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200132 struct eb_root streams_by_id; /* all active streams by their ID */
133 struct list send_list; /* list of blocked streams requesting to send */
134 struct list fctl_list; /* list of streams blocked by connection's fctl */
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200135 struct list blocked_list; /* list of streams blocked for other reasons (e.g. sfctl, dep) */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100136 struct buffer_wait buf_wait; /* wait list for buffer allocations */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200137 struct wait_event wait_event; /* To be used if we're waiting for I/Os */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200138};
139
Willy Tarreau18312642017-10-11 07:57:07 +0200140/* H2 stream state, in h2s->st */
141enum h2_ss {
142 H2_SS_IDLE = 0, // idle
143 H2_SS_RLOC, // reserved(local)
144 H2_SS_RREM, // reserved(remote)
145 H2_SS_OPEN, // open
146 H2_SS_HREM, // half-closed(remote)
147 H2_SS_HLOC, // half-closed(local)
Willy Tarreau96060ba2017-10-16 18:34:34 +0200148 H2_SS_ERROR, // an error needs to be sent using RST_STREAM
Willy Tarreau18312642017-10-11 07:57:07 +0200149 H2_SS_CLOSED, // closed
150 H2_SS_ENTRIES // must be last
151} __attribute__((packed));
152
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200153#define H2_SS_MASK(state) (1UL << (state))
154#define H2_SS_IDLE_BIT (1UL << H2_SS_IDLE)
155#define H2_SS_RLOC_BIT (1UL << H2_SS_RLOC)
156#define H2_SS_RREM_BIT (1UL << H2_SS_RREM)
157#define H2_SS_OPEN_BIT (1UL << H2_SS_OPEN)
158#define H2_SS_HREM_BIT (1UL << H2_SS_HREM)
159#define H2_SS_HLOC_BIT (1UL << H2_SS_HLOC)
160#define H2_SS_ERROR_BIT (1UL << H2_SS_ERROR)
161#define H2_SS_CLOSED_BIT (1UL << H2_SS_CLOSED)
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200162
Willy Tarreau18312642017-10-11 07:57:07 +0200163/* HTTP/2 stream flags (32 bit), in h2s->flags */
164#define H2_SF_NONE 0x00000000
165#define H2_SF_ES_RCVD 0x00000001
166#define H2_SF_ES_SENT 0x00000002
167
168#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
169#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
170
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200171/* stream flags indicating the reason the stream is blocked */
172#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200173#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux (must be in send list)
174#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl (must be in fctl list)
175#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl (must be in blocked list)
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200176#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
177
Willy Tarreau454f9052017-10-26 19:40:35 +0200178/* stream flags indicating how data is supposed to be sent */
179#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
Willy Tarreaud9464162020-01-10 18:25:07 +0100180/* unused flags: 0x00000200, 0x00000400 */
Willy Tarreau454f9052017-10-26 19:40:35 +0200181
Willy Tarreaud9464162020-01-10 18:25:07 +0100182#define H2_SF_NOTIFIED 0x00000800 // a paused stream was notified to try to send again
Willy Tarreau67434202017-11-06 20:20:51 +0100183#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100184#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100185
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100186#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
187
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200188#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
189#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200190#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200191
192
Willy Tarreau18312642017-10-11 07:57:07 +0200193/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
Christopher Fauletfafd1b02020-11-03 18:25:52 +0100194 * it is being processed in the internal HTTP representation (HTX).
Willy Tarreau18312642017-10-11 07:57:07 +0200195 */
196struct h2s {
197 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100198 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200199 struct h2c *h2c;
Willy Tarreau18312642017-10-11 07:57:07 +0200200 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200201 int32_t id; /* stream ID */
202 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200203 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200204 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
205 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200206 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100207 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200208 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Willy Tarreauf96508a2020-01-10 11:12:48 +0100209 struct wait_event *subs; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200210 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Willy Tarreau5723f292020-01-10 15:16:57 +0100211 struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to,
212 * in case there's no other subscription to do it */
Willy Tarreau18312642017-10-11 07:57:07 +0200213};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200214
Willy Tarreauc6405142017-09-21 20:23:50 +0200215/* descriptor for an h2 frame header */
216struct h2_fh {
217 uint32_t len; /* length, host order, 24 bits */
218 uint32_t sid; /* stream id, host order, 31 bits */
219 uint8_t ft; /* frame type */
220 uint8_t ff; /* frame flags */
221};
222
Willy Tarreau12ae2122019-08-08 18:23:12 +0200223/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200224static void h2_trace(enum trace_level level, uint64_t mask, \
225 const struct trace_source *src,
226 const struct ist where, const struct ist func,
227 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200228
229/* The event representation is split like this :
230 * strm - application layer
231 * h2s - internal H2 stream
232 * h2c - internal H2 connection
233 * conn - external connection
234 *
235 */
236static const struct trace_event h2_trace_events[] = {
237#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200238 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200239#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200240 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200241#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200242 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200243#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200244 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200245#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200246 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200247#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200248 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200249#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200250 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200251#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200252 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200253#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200254 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200255#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200256 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200257#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200258 { .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 +0200259#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200260 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200261#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200262 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200263#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200264 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200265#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200266 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200267#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200268 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200269#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200270 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200271#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200272 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200273#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200274 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200275#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200276 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200277#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200278 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200279#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200280 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200281#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200282 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200283#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200284 { .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 +0200285#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200286 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200287#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200288 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200289#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200290 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200291#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200292 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200293#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200294 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200295#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200296 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200297#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200298 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200299#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200300 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200301#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200302 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200303#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200304 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200305#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200306 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200307#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200308 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200309#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200310 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200311#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200312 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200313#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200314 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200315#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200316 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200317#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200318 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200319#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200320 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200321#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200322 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200323#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200324 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200325#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200326 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200327#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200328 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200329#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200330 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200331#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200332 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200333#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200334 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200335#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200336 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200337#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200338 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200339#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200340 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200341 { }
342};
343
344static const struct name_desc h2_trace_lockon_args[4] = {
345 /* arg1 */ { /* already used by the connection */ },
346 /* arg2 */ { .name="h2s", .desc="H2 stream" },
347 /* arg3 */ { },
348 /* arg4 */ { }
349};
350
351static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200352#define H2_VERB_CLEAN 1
353 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
354#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200355 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200356#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200357 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200358#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200359 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200360#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200361 { .name="complete", .desc="add full data dump when available" },
362 { /* end */ }
363};
364
365static struct trace_source trace_h2 = {
366 .name = IST("h2"),
367 .desc = "HTTP/2 multiplexer",
368 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200369 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200370 .known_events = h2_trace_events,
371 .lockon_args = h2_trace_lockon_args,
372 .decoding = h2_trace_decoding,
373 .report_events = ~0, // report everything by default
374};
375
376#define TRACE_SOURCE &trace_h2
377INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
378
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100379/* h2 stats module */
380enum {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100381 H2_ST_HEADERS_RCVD,
382 H2_ST_DATA_RCVD,
383 H2_ST_SETTINGS_RCVD,
384 H2_ST_RST_STREAM_RCVD,
385 H2_ST_GOAWAY_RCVD,
386
Amaury Denoyellea8879232020-10-27 17:16:03 +0100387 H2_ST_CONN_PROTO_ERR,
388 H2_ST_STRM_PROTO_ERR,
389 H2_ST_RST_STREAM_RESP,
390 H2_ST_GOAWAY_RESP,
391
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100392 H2_ST_OPEN_CONN,
393 H2_ST_OPEN_STREAM,
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100394 H2_ST_TOTAL_CONN,
395 H2_ST_TOTAL_STREAM,
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100396
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100397 H2_STATS_COUNT /* must be the last member of the enum */
398};
399
400static struct name_desc h2_stats[] = {
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100401 [H2_ST_HEADERS_RCVD] = { .name = "h2_headers_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100402 .desc = "Total number of received HEADERS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100403 [H2_ST_DATA_RCVD] = { .name = "h2_data_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100404 .desc = "Total number of received DATA frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100405 [H2_ST_SETTINGS_RCVD] = { .name = "h2_settings_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100406 .desc = "Total number of received SETTINGS frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100407 [H2_ST_RST_STREAM_RCVD] = { .name = "h2_rst_stream_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100408 .desc = "Total number of received RST_STREAM frames" },
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100409 [H2_ST_GOAWAY_RCVD] = { .name = "h2_goaway_rcvd",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100410 .desc = "Total number of received GOAWAY frames" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100411
412 [H2_ST_CONN_PROTO_ERR] = { .name = "h2_detected_conn_protocol_errors",
413 .desc = "Total number of connection protocol errors" },
414 [H2_ST_STRM_PROTO_ERR] = { .name = "h2_detected_strm_protocol_errors",
415 .desc = "Total number of stream protocol errors" },
416 [H2_ST_RST_STREAM_RESP] = { .name = "h2_rst_stream_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100417 .desc = "Total number of RST_STREAM sent on detected error" },
Amaury Denoyellea8879232020-10-27 17:16:03 +0100418 [H2_ST_GOAWAY_RESP] = { .name = "h2_goaway_resp",
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100419 .desc = "Total number of GOAWAY sent on detected error" },
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100420
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100421 [H2_ST_OPEN_CONN] = { .name = "h2_open_connections",
422 .desc = "Count of currently open connections" },
423 [H2_ST_OPEN_STREAM] = { .name = "h2_backend_open_streams",
424 .desc = "Count of currently open streams" },
425 [H2_ST_TOTAL_CONN] = { .name = "h2_open_connections",
426 .desc = "Total number of connections" },
427 [H2_ST_TOTAL_STREAM] = { .name = "h2_backend_open_streams",
428 .desc = "Total number of streams" },
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100429};
430
431static struct h2_counters {
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100432 long long headers_rcvd; /* total number of HEADERS frame received */
433 long long data_rcvd; /* total number of DATA frame received */
434 long long settings_rcvd; /* total number of SETTINGS frame received */
435 long long rst_stream_rcvd; /* total number of RST_STREAM frame received */
436 long long goaway_rcvd; /* total number of GOAWAY frame received */
Amaury Denoyellea8879232020-10-27 17:16:03 +0100437
438 long long conn_proto_err; /* total number of protocol errors detected */
439 long long strm_proto_err; /* total number of protocol errors detected */
Amaury Denoyelle2ac34d92020-11-03 15:04:44 +0100440 long long rst_stream_resp; /* total number of RST_STREAM frame sent on error */
441 long long goaway_resp; /* total number of GOAWAY frame sent on error */
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100442
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100443 long long open_conns; /* count of currently open connections */
444 long long open_streams; /* count of currently open streams */
445 long long total_conns; /* total number of connections */
446 long long total_streams; /* total number of streams */
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100447} h2_counters;
448
449static void h2_fill_stats(void *data, struct field *stats)
450{
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +0100451 struct h2_counters *counters = data;
452
453 stats[H2_ST_HEADERS_RCVD] = mkf_u64(FN_COUNTER, counters->headers_rcvd);
454 stats[H2_ST_DATA_RCVD] = mkf_u64(FN_COUNTER, counters->data_rcvd);
455 stats[H2_ST_SETTINGS_RCVD] = mkf_u64(FN_COUNTER, counters->settings_rcvd);
456 stats[H2_ST_RST_STREAM_RCVD] = mkf_u64(FN_COUNTER, counters->rst_stream_rcvd);
457 stats[H2_ST_GOAWAY_RCVD] = mkf_u64(FN_COUNTER, counters->goaway_rcvd);
Amaury Denoyellea8879232020-10-27 17:16:03 +0100458
459 stats[H2_ST_CONN_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->conn_proto_err);
460 stats[H2_ST_STRM_PROTO_ERR] = mkf_u64(FN_COUNTER, counters->strm_proto_err);
461 stats[H2_ST_RST_STREAM_RESP] = mkf_u64(FN_COUNTER, counters->rst_stream_resp);
462 stats[H2_ST_GOAWAY_RESP] = mkf_u64(FN_COUNTER, counters->goaway_resp);
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100463
Amaury Denoyellee7b891f2020-11-03 15:04:45 +0100464 stats[H2_ST_OPEN_CONN] = mkf_u64(FN_GAUGE, counters->open_conns);
465 stats[H2_ST_OPEN_STREAM] = mkf_u64(FN_GAUGE, counters->open_streams);
466 stats[H2_ST_TOTAL_CONN] = mkf_u64(FN_COUNTER, counters->total_conns);
467 stats[H2_ST_TOTAL_STREAM] = mkf_u64(FN_COUNTER, counters->total_streams);
Amaury Denoyelle3238b3f2020-10-27 17:16:00 +0100468}
469
470static struct stats_module h2_stats_module = {
471 .name = "h2",
472 .fill_stats = h2_fill_stats,
473 .stats = h2_stats,
474 .stats_count = H2_STATS_COUNT,
475 .counters = &h2_counters,
476 .counters_size = sizeof(h2_counters),
477 .domain_flags = MK_STATS_PROXY_DOMAIN(STATS_PX_CAP_FE|STATS_PX_CAP_BE),
478 .clearable = 1,
479};
480
481INITCALL1(STG_REGISTER, stats_register_module, &h2_stats_module);
482
Willy Tarreau8ceae722018-11-26 11:58:30 +0100483/* the h2c connection pool */
484DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
485
486/* the h2s stream pool */
487DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
488
Willy Tarreaudc572362018-12-12 08:08:05 +0100489/* The default connection window size is 65535, it may only be enlarged using
490 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
491 * we'll pretend we already received the difference between the two to send
492 * an equivalent window update to enlarge it to 2G-1.
493 */
494#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
495
Willy Tarreau455d5682019-05-24 19:42:18 +0200496/* maximum amount of data we're OK with re-aligning for buffer optimizations */
497#define MAX_DATA_REALIGN 1024
498
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200499/* a few settings from the global section */
500static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200501static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100502static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100503static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200504
Willy Tarreau2a856182017-05-16 15:20:39 +0200505/* a dmumy closed stream */
506static const struct h2s *h2_closed_stream = &(const struct h2s){
507 .cs = NULL,
508 .h2c = NULL,
509 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100510 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100511 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200512 .id = 0,
513};
514
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100515/* a dmumy closed stream returning a PROTOCOL_ERROR error */
516static const struct h2s *h2_error_stream = &(const struct h2s){
517 .cs = NULL,
518 .h2c = NULL,
519 .st = H2_SS_CLOSED,
520 .errcode = H2_ERR_PROTOCOL_ERROR,
521 .flags = 0,
522 .id = 0,
523};
524
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100525/* a dmumy closed stream returning a REFUSED_STREAM error */
526static const struct h2s *h2_refused_stream = &(const struct h2s){
527 .cs = NULL,
528 .h2c = NULL,
529 .st = H2_SS_CLOSED,
530 .errcode = H2_ERR_REFUSED_STREAM,
531 .flags = 0,
532 .id = 0,
533};
534
Willy Tarreau2a856182017-05-16 15:20:39 +0200535/* and a dummy idle stream for use with any unannounced stream */
536static const struct h2s *h2_idle_stream = &(const struct h2s){
537 .cs = NULL,
538 .h2c = NULL,
539 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100540 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200541 .id = 0,
542};
543
Olivier Houchard9f6af332018-05-25 14:04:04 +0200544static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200545static int h2_send(struct h2c *h2c);
546static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200547static int h2_process(struct h2c *h2c);
Olivier Houchard29fb89d2018-08-02 18:56:36 +0200548static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100549static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100550static 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 +0100551static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200552static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100553static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100554static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200555
Willy Tarreauab2ec452019-08-30 07:07:08 +0200556/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
557static inline const char *h2c_st_to_str(enum h2_cs st)
558{
559 switch (st) {
560 case H2_CS_PREFACE: return "PRF";
561 case H2_CS_SETTINGS1: return "STG";
562 case H2_CS_FRAME_H: return "FRH";
563 case H2_CS_FRAME_P: return "FRP";
564 case H2_CS_FRAME_A: return "FRA";
565 case H2_CS_FRAME_E: return "FRE";
566 case H2_CS_ERROR: return "ERR";
567 case H2_CS_ERROR2: return "ER2";
568 default: return "???";
569 }
570}
571
572/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
573static inline const char *h2s_st_to_str(enum h2_ss st)
574{
575 switch (st) {
576 case H2_SS_IDLE: return "IDL"; // idle
577 case H2_SS_RLOC: return "RSL"; // reserved local
578 case H2_SS_RREM: return "RSR"; // reserved remote
579 case H2_SS_OPEN: return "OPN"; // open
580 case H2_SS_HREM: return "HCR"; // half-closed remote
581 case H2_SS_HLOC: return "HCL"; // half-closed local
582 case H2_SS_ERROR : return "ERR"; // error
583 case H2_SS_CLOSED: return "CLO"; // closed
584 default: return "???";
585 }
586}
587
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200588/* the H2 traces always expect that arg1, if non-null, is of type connection
589 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
590 * that arg3, if non-null, is either of type htx for tx headers, or of type
591 * buffer for everything else.
592 */
593static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
594 const struct ist where, const struct ist func,
595 const void *a1, const void *a2, const void *a3, const void *a4)
596{
597 const struct connection *conn = a1;
598 const struct h2c *h2c = conn ? conn->ctx : NULL;
599 const struct h2s *h2s = a2;
600 const struct buffer *buf = a3;
601 const struct htx *htx;
602 int pos;
603
604 if (!h2c) // nothing to add
605 return;
606
Willy Tarreau17104d42019-08-30 07:12:55 +0200607 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200608 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
609
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100610 if (h2c->errcode)
611 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode);
612
Willy Tarreau73db4342019-09-25 07:28:44 +0200613 if (h2c->dsi >= 0 &&
614 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
Willy Tarreau8520d872020-09-18 07:39:29 +0200615 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 +0200616 }
617
618 if (h2s) {
619 if (h2s->id <= 0)
620 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
621 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100622 if (h2s->id && h2s->errcode)
623 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode);
Willy Tarreau73db4342019-09-25 07:28:44 +0200624 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200625 }
626
627 /* Let's dump decoded requests and responses right after parsing. They
628 * are traced at level USER with a few recognizable flags.
629 */
630 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
631 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
632 htx = htxbuf(buf); // recv req/res
633 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
634 htx = a3; // send req/res
635 else
636 htx = NULL;
637
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200638 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200639 const struct htx_blk *blk = htx_get_blk(htx, pos);
640 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
641 enum htx_blk_type type = htx_get_blk_type(blk);
642
643 if (type == HTX_BLK_REQ_SL)
644 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200645 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200646 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
647 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
648 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
649 else if (type == HTX_BLK_RES_SL)
650 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200651 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200652 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
653 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
654 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
655 }
656}
657
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200658
659/* Detect a pending read0 for a H2 connection. It happens if a read0 is pending
660 * on the connection AND if there is no more data in the demux buffer. The
661 * function returns 1 to report a read0 or 0 otherwise.
662 */
663static int h2c_read0_pending(struct h2c *h2c)
664{
665 if (conn_xprt_read0_pending(h2c->conn) && !b_data(&h2c->dbuf))
666 return 1;
667 return 0;
668}
669
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200670/* returns true if the connection is allowed to expire, false otherwise. A
671 * connection may expire when:
672 * - it has no stream
673 * - it has data in the mux buffer
674 * - it has streams in the blocked list
675 * - it has streams in the fctl list
676 * - it has streams in the send list
677 * Otherwise it means some streams are waiting in the data layer and it should
678 * not expire.
679 */
680static inline int h2c_may_expire(const struct h2c *h2c)
681{
682 return eb_is_empty(&h2c->streams_by_id) ||
683 br_data(h2c->mbuf) ||
684 !LIST_ISEMPTY(&h2c->blocked_list) ||
685 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100686 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200687}
688
Olivier Houchard7a977432019-03-21 15:47:13 +0100689static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200690h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100691{
692 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
693 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
694 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
695 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200696 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100697 (conn_xprt_read0_pending(h2c->conn) ||
698 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
699 return 1;
700
701 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100702}
703
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200704/*****************************************************/
705/* functions below are for dynamic buffer management */
706/*****************************************************/
707
Willy Tarreau315d8072017-12-10 22:17:57 +0100708/* indicates whether or not the we may call the h2_recv() function to attempt
709 * to receive data into the buffer and/or demux pending data. The condition is
710 * a bit complex due to some API limits for now. The rules are the following :
711 * - if an error or a shutdown was detected on the connection and the buffer
712 * is empty, we must not attempt to receive
713 * - if the demux buf failed to be allocated, we must not try to receive and
714 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100715 * - if no flag indicates a blocking condition, we may attempt to receive,
716 * regardless of whether the demux buffer is full or not, so that only
717 * de demux part decides whether or not to block. This is needed because
718 * the connection API indeed prevents us from re-enabling receipt that is
719 * already enabled in a polled state, so we must always immediately stop
720 * as soon as the demux can't proceed so as never to hit an end of read
721 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100722 * - otherwise must may not attempt
723 */
724static inline int h2_recv_allowed(const struct h2c *h2c)
725{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200726 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100727 (h2c->st0 >= H2_CS_ERROR ||
728 h2c->conn->flags & CO_FL_ERROR ||
729 conn_xprt_read0_pending(h2c->conn)))
730 return 0;
731
732 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100733 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100734 return 1;
735
736 return 0;
737}
738
Willy Tarreau47b515a2018-12-21 16:09:41 +0100739/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200740static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100741{
742 if (!h2_recv_allowed(h2c))
743 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200744 if ((!consider_buffer || !b_data(&h2c->dbuf))
745 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100746 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200747 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100748}
749
750
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100751/* returns true if the front connection has too many conn_streams attached */
752static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200753{
Willy Tarreaua8754662018-12-23 20:43:58 +0100754 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200755}
756
Willy Tarreau44e973f2018-03-01 17:49:30 +0100757/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
758 * flags are used to figure what buffer was requested. It returns 1 if the
759 * allocation succeeds, in which case the connection is woken up, or 0 if it's
760 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200761 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100762static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200763{
764 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100765 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200766
Willy Tarreau44e973f2018-03-01 17:49:30 +0100767 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200768 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200769 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200770 return 1;
771 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200772
Willy Tarreau51330962019-05-26 09:38:07 +0200773 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100774 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200775
776 if (h2c->flags & H2_CF_DEM_MROOM) {
777 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200778 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200779 }
Willy Tarreau14398122017-09-22 14:26:04 +0200780 return 1;
781 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100782
783 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
784 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200785 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100786 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200787 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100788 return 1;
789 }
790
Willy Tarreau14398122017-09-22 14:26:04 +0200791 return 0;
792}
793
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200794static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200795{
796 struct buffer *buf = NULL;
797
Willy Tarreau21046592020-02-26 10:39:36 +0100798 if (likely(!MT_LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100799 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
800 h2c->buf_wait.target = h2c;
801 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau86891272020-07-10 08:22:26 +0200802 MT_LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200803 }
804 return buf;
805}
806
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200807static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200808{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200809 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100810 b_free(bptr);
Willy Tarreau201840a2019-05-29 17:50:48 +0200811 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200812 }
813}
814
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200815static inline void h2_release_mbuf(struct h2c *h2c)
816{
817 struct buffer *buf;
818 unsigned int count = 0;
819
820 while (b_size(buf = br_head_pick(h2c->mbuf))) {
821 b_free(buf);
822 count++;
823 }
824 if (count)
Willy Tarreau201840a2019-05-29 17:50:48 +0200825 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200826}
827
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100828/* returns the number of allocatable outgoing streams for the connection taking
829 * the last_sid and the reserved ones into account.
830 */
831static inline int h2_streams_left(const struct h2c *h2c)
832{
833 int ret;
834
835 /* consider the number of outgoing streams we're allowed to create before
836 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
837 * nb_reserved is the number of streams which don't yet have an ID.
838 */
839 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
840 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
841 if (ret < 0)
842 ret = 0;
843 return ret;
844}
845
Willy Tarreau00f18a32019-01-26 12:19:01 +0100846/* returns the number of streams in use on a connection to figure if it's
847 * idle or not. We check nb_cs and not nb_streams as the caller will want
848 * to know if it was the last one after a detach().
849 */
850static int h2_used_streams(struct connection *conn)
851{
852 struct h2c *h2c = conn->ctx;
853
854 return h2c->nb_cs;
855}
856
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100857/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100858static int h2_avail_streams(struct connection *conn)
859{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100860 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100861 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100862 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100863
Willy Tarreau6afec462019-01-28 06:40:19 +0100864 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
865 * streams on the connection.
866 */
867 if (h2c->last_sid >= 0)
868 return 0;
869
Willy Tarreauc61966f2019-10-31 15:10:03 +0100870 if (h2c->st0 >= H2_CS_ERROR)
871 return 0;
872
Willy Tarreau86949782019-01-31 10:42:05 +0100873 /* note: may be negative if a SETTINGS frame changes the limit */
874 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100875
876 /* we must also consider the limit imposed by stream IDs */
877 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100878 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100879 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100880 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
881 ret1 = MIN(ret1, ret2);
882 }
883 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100884}
885
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200886
Willy Tarreau62f52692017-10-08 23:01:42 +0200887/*****************************************************************/
888/* functions below are dedicated to the mux setup and management */
889/*****************************************************************/
890
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200891/* Initialize the mux once it's attached. For outgoing connections, the context
892 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200893 * connections from the fact that the context is still NULL (even during mux
894 * upgrades). <input> is always used as Input buffer and may contain data. It is
895 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200896 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200897static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
898 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200899{
900 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100901 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200902 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200903
Christopher Fauletf81ef032019-10-04 15:19:43 +0200904 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200905
Willy Tarreaubafbe012017-11-24 17:34:44 +0100906 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200907 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200908 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200909
Christopher Faulete9b70722019-04-08 10:46:02 +0200910 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200911 h2c->flags = H2_CF_IS_BACK;
912 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
913 if (tick_isset(prx->timeout.serverfin))
914 h2c->shut_timeout = prx->timeout.serverfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100915
916 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_be,
917 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200918 } else {
919 h2c->flags = H2_CF_NONE;
920 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
921 if (tick_isset(prx->timeout.clientfin))
922 h2c->shut_timeout = prx->timeout.clientfin;
Amaury Denoyellec92697d2020-10-27 17:16:01 +0100923
924 h2c->px_counters = EXTRA_COUNTERS_GET(prx->extra_counters_fe,
925 &h2_stats_module);
Willy Tarreau01b44822018-10-03 14:26:37 +0200926 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100927
Willy Tarreau0b37d652018-10-03 10:33:02 +0200928 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100929 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100930 if (tick_isset(h2c->timeout)) {
931 t = task_new(tid_bit);
932 if (!t)
933 goto fail;
934
935 h2c->task = t;
936 t->process = h2_timeout_task;
937 t->context = h2c;
938 t->expire = tick_add(now_ms, h2c->timeout);
939 }
Willy Tarreauea392822017-10-31 10:02:25 +0100940
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200941 h2c->wait_event.tasklet = tasklet_new();
942 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200943 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200944 h2c->wait_event.tasklet->process = h2_io_cb;
945 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100946 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200947
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200948 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200949 if (!h2c->ddht)
950 goto fail;
951
952 /* Initialise the context. */
953 h2c->st0 = H2_CS_PREFACE;
954 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100955 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200956 h2c->max_id = -1;
957 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100958 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200959 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100960 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200961 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100962 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100963 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200964
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200965 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200966 h2c->dsi = -1;
967 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100968
Willy Tarreau32218eb2017-09-22 08:07:25 +0200969 h2c->last_sid = -1;
970
Willy Tarreau51330962019-05-26 09:38:07 +0200971 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200972 h2c->miw = 65535; /* mux initial window size */
973 h2c->mws = 65535; /* mux window size */
974 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200975 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200976 LIST_INIT(&h2c->send_list);
977 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200978 LIST_INIT(&h2c->blocked_list);
Willy Tarreau21046592020-02-26 10:39:36 +0100979 MT_LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200980
Christopher Fauletf81ef032019-10-04 15:19:43 +0200981 conn->ctx = h2c;
982
Willy Tarreau3f133572017-10-31 19:21:06 +0100983 if (t)
984 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100985
Willy Tarreau01b44822018-10-03 14:26:37 +0200986 if (h2c->flags & H2_CF_IS_BACK) {
987 /* FIXME: this is temporary, for outgoing connections we need
988 * to immediately allocate a stream until the code is modified
989 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +0200990 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +0200991 */
992 struct h2s *h2s;
993
Christopher Fauletf81ef032019-10-04 15:19:43 +0200994 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200995 if (!h2s)
996 goto fail_stream;
997 }
998
Amaury Denoyelle66942c12020-10-27 17:16:04 +0100999 HA_ATOMIC_ADD(&h2c->px_counters->open_conns, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001000 HA_ATOMIC_ADD(&h2c->px_counters->total_conns, 1);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001001
Willy Tarreau0f383582018-10-03 14:22:21 +02001002 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02001003 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001004 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001005 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +02001006 fail_stream:
1007 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +02001008 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +02001009 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001010 if (h2c->wait_event.tasklet)
1011 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +01001012 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +02001013 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +02001014 conn->ctx = conn_ctx; /* restore saved ctx */
1015 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001016 return -1;
1017}
1018
Willy Tarreau751f2d02018-10-05 09:35:00 +02001019/* returns the next allocatable outgoing stream ID for the H2 connection, or
1020 * -1 if no more is allocatable.
1021 */
1022static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
1023{
1024 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +01001025
1026 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +02001027 id = -1;
1028 return id;
1029}
1030
Willy Tarreau2373acc2017-10-12 17:35:14 +02001031/* returns the stream associated with id <id> or NULL if not found */
1032static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
1033{
1034 struct eb32_node *node;
1035
Willy Tarreau751f2d02018-10-05 09:35:00 +02001036 if (id == 0)
1037 return (struct h2s *)h2_closed_stream;
1038
Willy Tarreau2a856182017-05-16 15:20:39 +02001039 if (id > h2c->max_id)
1040 return (struct h2s *)h2_idle_stream;
1041
Willy Tarreau2373acc2017-10-12 17:35:14 +02001042 node = eb32_lookup(&h2c->streams_by_id, id);
1043 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +02001044 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +02001045
1046 return container_of(node, struct h2s, by_id);
1047}
1048
Christopher Faulet73c12072019-04-08 11:23:22 +02001049/* release function. This one should be called to free all resources allocated
1050 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +02001051 */
Christopher Faulet73c12072019-04-08 11:23:22 +02001052static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02001053{
William Dauchy477757c2020-08-07 22:19:23 +02001054 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001055
Willy Tarreau7838a792019-08-12 18:42:03 +02001056 TRACE_ENTER(H2_EV_H2C_END);
1057
Willy Tarreau32218eb2017-09-22 08:07:25 +02001058 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +02001059 /* The connection must be aattached to this mux to be released */
1060 if (h2c->conn && h2c->conn->ctx == h2c)
1061 conn = h2c->conn;
1062
Willy Tarreau7838a792019-08-12 18:42:03 +02001063 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001064 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +02001065
Willy Tarreau21046592020-02-26 10:39:36 +01001066 if (MT_LIST_ADDED(&h2c->buf_wait.list))
1067 MT_LIST_DEL(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +02001068
Willy Tarreau44e973f2018-03-01 17:49:30 +01001069 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +02001070 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +01001071
Willy Tarreauea392822017-10-31 10:02:25 +01001072 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +02001073 h2c->task->context = NULL;
1074 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +01001075 h2c->task = NULL;
1076 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001077 if (h2c->wait_event.tasklet)
1078 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +02001079 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01001080 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +02001081 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +01001082
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001083 HA_ATOMIC_SUB(&h2c->px_counters->open_conns, 1);
1084
Willy Tarreaubafbe012017-11-24 17:34:44 +01001085 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001086 }
1087
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001088 if (conn) {
1089 conn->mux = NULL;
1090 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02001091 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +02001092
Christopher Faulet39a96ee2019-04-08 10:52:21 +02001093 conn_stop_tracking(conn);
1094 conn_full_close(conn);
1095 if (conn->destroy_cb)
1096 conn->destroy_cb(conn);
1097 conn_free(conn);
1098 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001099
1100 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +02001101}
1102
1103
Willy Tarreau71681172017-10-23 14:39:06 +02001104/******************************************************/
1105/* functions below are for the H2 protocol processing */
1106/******************************************************/
1107
1108/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +01001109static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +02001110{
1111 return h2s ? h2s->id : 0;
1112}
1113
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001114/* returns the sum of the stream's own window size and the mux's initial
1115 * window, which together form the stream's effective window size.
1116 */
1117static inline int h2s_mws(const struct h2s *h2s)
1118{
1119 return h2s->sws + h2s->h2c->miw;
1120}
1121
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001122/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001123static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001124{
1125 if (h2c->msi < 0)
1126 return 0;
1127
1128 if (h2c->msi == h2s_id(h2s))
1129 return 0;
1130
1131 return 1;
1132}
1133
Willy Tarreau741d6df2017-10-17 08:00:59 +02001134/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001135static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001136{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001137 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001138 h2c->errcode = err;
1139 h2c->st0 = H2_CS_ERROR;
1140}
1141
Willy Tarreau175cebb2019-01-24 10:02:24 +01001142/* marks an error on the stream. It may also update an already closed stream
1143 * (e.g. to report an error after an RST was received).
1144 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001145static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001146{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001147 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001148 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001149 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001150 if (h2s->st < H2_SS_ERROR)
1151 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001152 if (h2s->cs)
1153 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001154 }
1155}
1156
Willy Tarreau7e094452018-12-19 18:08:52 +01001157/* attempt to notify the data layer of recv availability */
1158static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1159{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001160 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001161 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001162 tasklet_wakeup(h2s->subs->tasklet);
1163 h2s->subs->events &= ~SUB_RETRY_RECV;
1164 if (!h2s->subs->events)
1165 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001166 }
1167}
1168
1169/* attempt to notify the data layer of send availability */
1170static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1171{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001172 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001173 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001174 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001175 tasklet_wakeup(h2s->subs->tasklet);
1176 h2s->subs->events &= ~SUB_RETRY_SEND;
1177 if (!h2s->subs->events)
1178 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001179 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001180 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1181 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1182 tasklet_wakeup(h2s->shut_tl);
1183 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001184}
1185
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001186/* alerts the data layer, trying to wake it up by all means, following
1187 * this sequence :
1188 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1189 * - if its subscribed to send, then it's woken up for send
1190 * - if it was subscribed to neither, its ->wake() callback is called
1191 * It is safe to call this function with a closed stream which doesn't have a
1192 * conn_stream anymore.
1193 */
1194static void __maybe_unused h2s_alert(struct h2s *h2s)
1195{
Willy Tarreau7838a792019-08-12 18:42:03 +02001196 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1197
Willy Tarreauf96508a2020-01-10 11:12:48 +01001198 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001199 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001200 h2s_notify_recv(h2s);
1201 h2s_notify_send(h2s);
1202 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001203 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1204 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001205 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001206 }
1207
1208 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001209}
1210
Willy Tarreaue4820742017-07-27 13:37:23 +02001211/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001212static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001213{
1214 uint8_t *out = frame;
1215
1216 *out = len >> 16;
1217 write_n16(out + 1, len);
1218}
1219
Willy Tarreau54c15062017-10-10 17:10:03 +02001220/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1221 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1222 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001223 * available in the buffer's input prior to calling this function. The buffer
1224 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001225 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001226static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001227 const struct buffer *b, int o)
1228{
Willy Tarreau591d4452018-06-15 17:21:00 +02001229 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 +02001230}
1231
Willy Tarreau1f094672017-11-20 21:27:45 +01001232static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001233{
Willy Tarreau591d4452018-06-15 17:21:00 +02001234 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001235}
1236
Willy Tarreau1f094672017-11-20 21:27:45 +01001237static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001238{
Willy Tarreau591d4452018-06-15 17:21:00 +02001239 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001240}
1241
Willy Tarreau1f094672017-11-20 21:27:45 +01001242static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001243{
Willy Tarreau591d4452018-06-15 17:21:00 +02001244 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001245}
1246
1247
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001248/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1249 * The algorithm is not obvious. It turns out that H2 headers are neither
1250 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1251 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001252 *
1253 * b0 b1 b2 b3 b4 b5..b8
1254 * +----------+---------+--------+----+----+----------------------+
1255 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1256 * +----------+---------+--------+----+----+----------------------+
1257 *
1258 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1259 * we get the sid properly aligned and ordered, and 16 bits of len properly
1260 * ordered as well. The type and flags can be extracted using bit shifts from
1261 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001262 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1263 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001264 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001265static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001266{
1267 uint64_t w;
1268
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001269 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001270 return 0;
1271
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001272 w = h2_get_n64(b, o + 1);
1273 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001274 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1275 h->ff = w >> 32;
1276 h->ft = w >> 40;
1277 h->len += w >> 48;
1278 return 1;
1279}
1280
1281/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1282 * h2_peek_frame_hdr() above.
1283 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001284static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001285{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001286 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001287}
1288
1289/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001290static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001291{
1292 int ret;
1293
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001294 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001295 if (ret > 0)
1296 h2_skip_frame_hdr(b);
1297 return ret;
1298}
1299
Willy Tarreaucb985a42019-10-07 16:56:34 +02001300
1301/* try to fragment the headers frame present at the beginning of buffer <b>,
1302 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1303 * success. Typical causes of failure include a buffer not large enough to
1304 * add extra frame headers. The existing frame size is read in the current
1305 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1306 * and its length will be adjusted. The stream ID for continuation frames will
1307 * be copied from the initial frame's.
1308 */
1309static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1310{
1311 size_t remain = b->data - 9;
1312 int extra_frames = (remain - 1) / mfs;
1313 size_t fsize;
1314 char *fptr;
1315 int frame;
1316
1317 if (b->data <= mfs + 9)
1318 return 1;
1319
1320 /* Too large a frame, we need to fragment it using CONTINUATION
1321 * frames. We start from the end and move tails as needed.
1322 */
1323 if (b->data + extra_frames * 9 > b->size)
1324 return 0;
1325
1326 for (frame = extra_frames; frame; frame--) {
1327 fsize = ((remain - 1) % mfs) + 1;
1328 remain -= fsize;
1329
1330 /* move data */
1331 fptr = b->area + 9 + remain + (frame - 1) * 9;
1332 memmove(fptr + 9, b->area + 9 + remain, fsize);
1333 b->data += 9;
1334
1335 /* write new frame header */
1336 h2_set_frame_size(fptr, fsize);
1337 fptr[3] = H2_FT_CONTINUATION;
1338 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1339 write_n32(fptr + 5, read_n32(b->area + 5));
1340 }
1341
1342 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1343 h2_set_frame_size(b->area, remain);
1344 return 1;
1345}
1346
1347
Willy Tarreau00dd0782018-03-01 16:31:34 +01001348/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1349 * its connection if the stream was not yet closed. Please use this exclusively
1350 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001351 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001352static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001353{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001354 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001355 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001356 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001357 if (!h2s->id)
1358 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001359 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001360 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1361 h2s_notify_recv(h2s);
1362 }
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001363 HA_ATOMIC_SUB(&h2s->h2c->px_counters->open_streams, 1);
1364
Willy Tarreau7838a792019-08-12 18:42:03 +02001365 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001366 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001367 h2s->st = H2_SS_CLOSED;
1368}
1369
Willy Tarreau71049cc2018-03-28 13:56:39 +02001370/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001371/* h2s_destroy should only ever be called by the thread that owns the stream,
1372 * that means that a tasklet should be used if we want to destroy the h2s
1373 * from another thread
1374 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001375static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001376{
Willy Tarreau7838a792019-08-12 18:42:03 +02001377 struct connection *conn = h2s->h2c->conn;
1378
1379 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1380
Willy Tarreau0a10de62018-03-01 16:27:53 +01001381 h2s_close(h2s);
1382 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001383 if (b_size(&h2s->rxbuf)) {
1384 b_free(&h2s->rxbuf);
1385 offer_buffers(NULL, tasks_run_queue);
1386 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001387
1388 if (h2s->subs)
1389 h2s->subs->events = 0;
1390
Joseph Herlantd77575d2018-11-25 10:54:45 -08001391 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001392 * reference left would be in the h2c send_list/fctl_list, and if
1393 * we're in it, we're getting out anyway
1394 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001395 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001396
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001397 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001398 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001399 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001400
1401 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001402}
1403
Willy Tarreaua8e49542018-10-03 18:53:55 +02001404/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1405 * stream tree. In case of error, nothing is added and NULL is returned. The
1406 * causes of errors can be any failed memory allocation. The caller is
1407 * responsible for checking if the connection may support an extra stream
1408 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001409 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001410static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001411{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001412 struct h2s *h2s;
1413
Willy Tarreau7838a792019-08-12 18:42:03 +02001414 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1415
Willy Tarreaubafbe012017-11-24 17:34:44 +01001416 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001417 if (!h2s)
1418 goto out;
1419
Willy Tarreau5723f292020-01-10 15:16:57 +01001420 h2s->shut_tl = tasklet_new();
1421 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001422 pool_free(pool_head_h2s, h2s);
1423 goto out;
1424 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001425 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001426 h2s->shut_tl->process = h2_deferred_shut;
1427 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001428 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001429 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001430 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001431 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001432 h2s->flags = H2_SF_NONE;
1433 h2s->errcode = H2_ERR_NO_ERROR;
1434 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001435 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001436 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001437 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001438
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001439 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001440 if (id > 0)
1441 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001442 else
1443 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001444
1445 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001446 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001447 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001448
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001449 HA_ATOMIC_ADD(&h2c->px_counters->open_streams, 1);
Amaury Denoyellee7b891f2020-11-03 15:04:45 +01001450 HA_ATOMIC_ADD(&h2c->px_counters->total_streams, 1);
Amaury Denoyelle66942c12020-10-27 17:16:04 +01001451
Willy Tarreau7838a792019-08-12 18:42:03 +02001452 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001453 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001454 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001455 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001456 return NULL;
1457}
1458
1459/* creates a new stream <id> on the h2c connection and returns it, or NULL in
1460 * case of memory allocation error.
1461 */
1462static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
1463{
1464 struct session *sess = h2c->conn->owner;
1465 struct conn_stream *cs;
1466 struct h2s *h2s;
1467
Willy Tarreau7838a792019-08-12 18:42:03 +02001468 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1469
Willy Tarreaua8e49542018-10-03 18:53:55 +02001470 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1471 goto out;
1472
1473 h2s = h2s_new(h2c, id);
1474 if (!h2s)
1475 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001476
Christopher Faulet236c93b2020-07-02 09:19:54 +02001477 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001478 if (!cs)
1479 goto out_close;
1480
Olivier Houchard746fb772018-12-15 19:42:00 +01001481 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001482 h2s->cs = cs;
1483 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001484 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001485
1486 if (stream_create_from_cs(cs) < 0)
1487 goto out_free_cs;
1488
Willy Tarreau590a0512018-09-05 11:56:48 +02001489 /* We want the accept date presented to the next stream to be the one
1490 * we have now, the handshake time to be null (since the next stream
1491 * is not delayed by a handshake), and the idle time to count since
1492 * right now.
1493 */
1494 sess->accept_date = date;
1495 sess->tv_accept = now;
1496 sess->t_handshake = 0;
1497
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001498 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001499 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001500 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001501 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001502 return h2s;
1503
1504 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001505 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001506 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001507 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001508 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001509 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001510 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001511 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001512 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001513 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001514}
1515
Willy Tarreau751f2d02018-10-05 09:35:00 +02001516/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1517 * and returns it, or NULL in case of memory allocation error or if the highest
1518 * possible stream ID was reached.
1519 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001520static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001521{
1522 struct h2s *h2s = NULL;
1523
Willy Tarreau7838a792019-08-12 18:42:03 +02001524 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1525
Willy Tarreau86949782019-01-31 10:42:05 +01001526 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001527 goto out;
1528
Willy Tarreaua80dca82019-01-24 17:08:28 +01001529 if (h2_streams_left(h2c) < 1)
1530 goto out;
1531
Willy Tarreau751f2d02018-10-05 09:35:00 +02001532 /* Defer choosing the ID until we send the first message to create the stream */
1533 h2s = h2s_new(h2c, 0);
1534 if (!h2s)
1535 goto out;
1536
1537 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001538 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001539 cs->ctx = h2s;
1540 h2c->nb_cs++;
1541
Willy Tarreau751f2d02018-10-05 09:35:00 +02001542 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001543 if (likely(h2s))
1544 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1545 else
1546 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001547 return h2s;
1548}
1549
Willy Tarreaube5b7152017-09-25 16:25:39 +02001550/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1551 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1552 * the various settings codes.
1553 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001554static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001555{
1556 struct buffer *res;
1557 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001558 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001559 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001560 int ret = 0;
1561
1562 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001563
1564 if (h2c_mux_busy(h2c, NULL)) {
1565 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001566 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001567 }
1568
Willy Tarreaube5b7152017-09-25 16:25:39 +02001569 chunk_init(&buf, buf_data, sizeof(buf_data));
1570 chunk_memcpy(&buf,
1571 "\x00\x00\x00" /* length : 0 for now */
1572 "\x04\x00" /* type : 4 (settings), flags : 0 */
1573 "\x00\x00\x00\x00", /* stream ID : 0 */
1574 9);
1575
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001576 if (h2c->flags & H2_CF_IS_BACK) {
1577 /* send settings_enable_push=0 */
1578 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1579 }
1580
Willy Tarreaube5b7152017-09-25 16:25:39 +02001581 if (h2_settings_header_table_size != 4096) {
1582 char str[6] = "\x00\x01"; /* header_table_size */
1583
1584 write_n32(str + 2, h2_settings_header_table_size);
1585 chunk_memcat(&buf, str, 6);
1586 }
1587
1588 if (h2_settings_initial_window_size != 65535) {
1589 char str[6] = "\x00\x04"; /* initial_window_size */
1590
1591 write_n32(str + 2, h2_settings_initial_window_size);
1592 chunk_memcat(&buf, str, 6);
1593 }
1594
1595 if (h2_settings_max_concurrent_streams != 0) {
1596 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1597
1598 /* Note: 0 means "unlimited" for haproxy's config but not for
1599 * the protocol, so never send this value!
1600 */
1601 write_n32(str + 2, h2_settings_max_concurrent_streams);
1602 chunk_memcat(&buf, str, 6);
1603 }
1604
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001605 mfs = h2_settings_max_frame_size;
1606 if (mfs > global.tune.bufsize)
1607 mfs = global.tune.bufsize;
1608
1609 if (!mfs)
1610 mfs = global.tune.bufsize;
1611
1612 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001613 char str[6] = "\x00\x05"; /* max_frame_size */
1614
1615 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1616 * match bufsize - rewrite size, but at the moment it seems
1617 * that clients don't take care of it.
1618 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001619 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001620 chunk_memcat(&buf, str, 6);
1621 }
1622
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001623 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001624
1625 res = br_tail(h2c->mbuf);
1626 retry:
1627 if (!h2_get_buf(h2c, res)) {
1628 h2c->flags |= H2_CF_MUX_MALLOC;
1629 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001630 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001631 }
1632
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001633 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001634 if (unlikely(ret <= 0)) {
1635 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001636 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1637 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001638 h2c->flags |= H2_CF_MUX_MFULL;
1639 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001640 }
1641 else {
1642 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001643 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001644 }
1645 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001646 out:
1647 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001648 return ret;
1649}
1650
Willy Tarreau52eed752017-09-22 15:05:09 +02001651/* Try to receive a connection preface, then upon success try to send our
1652 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1653 * missing data. It may return an error in h2c.
1654 */
1655static int h2c_frt_recv_preface(struct h2c *h2c)
1656{
1657 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001658 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001659
Willy Tarreau7838a792019-08-12 18:42:03 +02001660 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1661
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001662 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001663
1664 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001665 if (ret1 < 0)
1666 sess_log(h2c->conn->owner);
1667
Amaury Denoyellea8879232020-10-27 17:16:03 +01001668 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn)) {
Willy Tarreau52eed752017-09-22 15:05:09 +02001669 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01001670 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
1671 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001672 ret2 = 0;
1673 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001674 }
1675
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001676 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001677 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001678 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001679 out:
1680 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001681 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001682}
1683
Willy Tarreau01b44822018-10-03 14:26:37 +02001684/* Try to send a connection preface, then upon success try to send our
1685 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1686 * missing data. It may return an error in h2c.
1687 */
1688static int h2c_bck_send_preface(struct h2c *h2c)
1689{
1690 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001691 int ret = 0;
1692
1693 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001694
1695 if (h2c_mux_busy(h2c, NULL)) {
1696 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001697 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001698 }
1699
Willy Tarreaubcc45952019-05-26 10:05:50 +02001700 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001701 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001702 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001703 h2c->flags |= H2_CF_MUX_MALLOC;
1704 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001705 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001706 }
1707
1708 if (!b_data(res)) {
1709 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001710 ret = b_istput(res, ist(H2_CONN_PREFACE));
1711 if (unlikely(ret <= 0)) {
1712 if (!ret) {
1713 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1714 goto retry;
1715 h2c->flags |= H2_CF_MUX_MFULL;
1716 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001717 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001718 }
1719 else {
1720 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001721 ret = 0;
1722 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001723 }
1724 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001725 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001726 ret = h2c_send_settings(h2c);
1727 out:
1728 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1729 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001730}
1731
Willy Tarreau081d4722017-05-16 21:51:05 +02001732/* try to send a GOAWAY frame on the connection to report an error or a graceful
1733 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1734 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1735 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1736 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1737 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1738 * on unrecoverable failure. It will not attempt to send one again in this last
1739 * case so that it is safe to use h2c_error() to report such errors.
1740 */
1741static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1742{
1743 struct buffer *res;
1744 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001745 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001746
Willy Tarreau7838a792019-08-12 18:42:03 +02001747 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1748
1749 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1750 ret = 1; // claim that it worked
1751 goto out;
1752 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001753
1754 if (h2c_mux_busy(h2c, h2s)) {
1755 if (h2s)
1756 h2s->flags |= H2_SF_BLK_MBUSY;
1757 else
1758 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001759 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001760 }
1761
Willy Tarreau9c218e72019-05-26 10:08:28 +02001762 /* len: 8, type: 7, flags: none, sid: 0 */
1763 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1764
1765 if (h2c->last_sid < 0)
1766 h2c->last_sid = h2c->max_id;
1767
1768 write_n32(str + 9, h2c->last_sid);
1769 write_n32(str + 13, h2c->errcode);
1770
Willy Tarreaubcc45952019-05-26 10:05:50 +02001771 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001772 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001773 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001774 h2c->flags |= H2_CF_MUX_MALLOC;
1775 if (h2s)
1776 h2s->flags |= H2_SF_BLK_MROOM;
1777 else
1778 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001779 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001780 }
1781
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001782 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001783 if (unlikely(ret <= 0)) {
1784 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001785 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1786 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001787 h2c->flags |= H2_CF_MUX_MFULL;
1788 if (h2s)
1789 h2s->flags |= H2_SF_BLK_MROOM;
1790 else
1791 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001792 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001793 }
1794 else {
1795 /* we cannot report this error using GOAWAY, so we mark
1796 * it and claim a success.
1797 */
1798 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1799 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001800 ret = 1;
1801 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001802 }
1803 }
1804 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02001805 out:
Amaury Denoyellea8879232020-10-27 17:16:03 +01001806 HA_ATOMIC_ADD(&h2c->px_counters->goaway_resp, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001807 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001808 return ret;
1809}
1810
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001811/* Try to send an RST_STREAM frame on the connection for the indicated stream
1812 * during mux operations. This stream must be valid and cannot be closed
1813 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1814 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1815 * not yet.
1816 *
1817 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1818 * to write the message, it subscribes the stream to future notifications.
1819 */
1820static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1821{
1822 struct buffer *res;
1823 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001824 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001825
Willy Tarreau7838a792019-08-12 18:42:03 +02001826 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1827
1828 if (!h2s || h2s->st == H2_SS_CLOSED) {
1829 ret = 1;
1830 goto out;
1831 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001832
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001833 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1834 * RST_STREAM in response to a RST_STREAM frame.
1835 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001836 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001837 ret = 1;
1838 goto ignore;
1839 }
1840
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001841 if (h2c_mux_busy(h2c, h2s)) {
1842 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001843 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001844 }
1845
Willy Tarreau9c218e72019-05-26 10:08:28 +02001846 /* len: 4, type: 3, flags: none */
1847 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1848 write_n32(str + 5, h2s->id);
1849 write_n32(str + 9, h2s->errcode);
1850
Willy Tarreaubcc45952019-05-26 10:05:50 +02001851 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001852 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001853 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001854 h2c->flags |= H2_CF_MUX_MALLOC;
1855 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001856 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001857 }
1858
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001859 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001860 if (unlikely(ret <= 0)) {
1861 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001862 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1863 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001864 h2c->flags |= H2_CF_MUX_MFULL;
1865 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001866 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001867 }
1868 else {
1869 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001870 ret = 0;
1871 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001872 }
1873 }
1874
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001875 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001876 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001877 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001878 out:
1879 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001880 return ret;
1881}
1882
1883/* Try to send an RST_STREAM frame on the connection for the stream being
1884 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001885 * error code, even if the stream is one of the dummy ones, and will update
1886 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001887 *
1888 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1889 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001890 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001891 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001892 */
1893static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1894{
1895 struct buffer *res;
1896 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001897 int ret = 0;
1898
1899 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001900
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001901 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1902 * RST_STREAM in response to a RST_STREAM frame.
1903 */
1904 if (h2c->dft == H2_FT_RST_STREAM) {
1905 ret = 1;
1906 goto ignore;
1907 }
1908
Willy Tarreau27a84c92017-10-17 08:10:17 +02001909 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001910 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001911 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001912 }
1913
Willy Tarreau9c218e72019-05-26 10:08:28 +02001914 /* len: 4, type: 3, flags: none */
1915 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1916
1917 write_n32(str + 5, h2c->dsi);
1918 write_n32(str + 9, h2s->errcode);
1919
Willy Tarreaubcc45952019-05-26 10:05:50 +02001920 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001921 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001922 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001923 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001924 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001925 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001926 }
1927
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001928 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001929 if (unlikely(ret <= 0)) {
1930 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001931 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1932 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001933 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001934 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001935 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001936 }
1937 else {
1938 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001939 ret = 0;
1940 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001941 }
1942 }
1943
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001944 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001945 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001946 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001947 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001948 }
1949
Willy Tarreau7838a792019-08-12 18:42:03 +02001950 out:
Amaury Denoyellea8879232020-10-27 17:16:03 +01001951 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_resp, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001952 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001953 return ret;
1954}
1955
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001956/* try to send an empty DATA frame with the ES flag set to notify about the
1957 * end of stream and match a shutdown(write). If an ES was already sent as
1958 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1959 * on success or zero if nothing was done. In case of lack of room to write the
1960 * message, it subscribes the requesting stream to future notifications.
1961 */
1962static int h2_send_empty_data_es(struct h2s *h2s)
1963{
1964 struct h2c *h2c = h2s->h2c;
1965 struct buffer *res;
1966 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001967 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001968
Willy Tarreau7838a792019-08-12 18:42:03 +02001969 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1970
1971 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1972 ret = 1;
1973 goto out;
1974 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001975
1976 if (h2c_mux_busy(h2c, h2s)) {
1977 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001978 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001979 }
1980
Willy Tarreau9c218e72019-05-26 10:08:28 +02001981 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1982 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1983 write_n32(str + 5, h2s->id);
1984
Willy Tarreaubcc45952019-05-26 10:05:50 +02001985 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001986 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001987 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001988 h2c->flags |= H2_CF_MUX_MALLOC;
1989 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001990 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001991 }
1992
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001993 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001994 if (likely(ret > 0)) {
1995 h2s->flags |= H2_SF_ES_SENT;
1996 }
1997 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001998 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1999 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002000 h2c->flags |= H2_CF_MUX_MFULL;
2001 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01002002 }
2003 else {
2004 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002005 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002006 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002007 out:
2008 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01002009 return ret;
2010}
2011
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002012/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002013 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002014 * is automatically updated accordingly. If the stream is orphaned, it is
2015 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01002016 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002017static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01002018{
Willy Tarreau7838a792019-08-12 18:42:03 +02002019 struct h2c *h2c = h2s->h2c;
2020
2021 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
2022
Christopher Fauletf02ca002019-03-07 16:21:34 +01002023 if (!h2s->cs) {
2024 /* this stream was already orphaned */
2025 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002026 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002027 return;
2028 }
2029
Christopher Fauletaade4ed2020-10-08 15:38:41 +02002030 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002031 if (h2s->st == H2_SS_OPEN)
2032 h2s->st = H2_SS_HREM;
2033 else if (h2s->st == H2_SS_HLOC)
2034 h2s_close(h2s);
2035 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002036
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002037 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
2038 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
2039 h2s->cs->flags |= CS_FL_ERR_PENDING;
2040 if (h2s->cs->flags & CS_FL_EOS)
2041 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02002042
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02002043 if (h2s->st < H2_SS_ERROR)
2044 h2s->st = H2_SS_ERROR;
2045 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01002046
2047 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02002048 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002049}
2050
2051/* wake the streams attached to the connection, whose id is greater than <last>
2052 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002053 */
Willy Tarreau23482912019-05-07 15:23:14 +02002054static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002055{
2056 struct eb32_node *node;
2057 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002058
Willy Tarreau7838a792019-08-12 18:42:03 +02002059 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
2060
Christopher Fauletf02ca002019-03-07 16:21:34 +01002061 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002062 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
2063 while (node) {
2064 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002065 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002066 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01002067 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01002068
Christopher Fauletf02ca002019-03-07 16:21:34 +01002069 /* Wake all streams with unassigned ID (ID == 0) */
2070 node = eb32_lookup(&h2c->streams_by_id, 0);
2071 while (node) {
2072 h2s = container_of(node, struct h2s, by_id);
2073 if (h2s->id > 0)
2074 break;
2075 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02002076 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002077 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002078
2079 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01002080}
2081
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002082/* Wake up all blocked streams whose window size has become positive after the
2083 * mux's initial window was adjusted. This should be done after having processed
2084 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002085 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002086static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02002087{
2088 struct h2s *h2s;
2089 struct eb32_node *node;
2090
Willy Tarreau7838a792019-08-12 18:42:03 +02002091 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2092
Willy Tarreau3421aba2017-07-27 15:41:03 +02002093 node = eb32_first(&h2c->streams_by_id);
2094 while (node) {
2095 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002096 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002097 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002098 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002099 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2100 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002101 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01002102 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002103 node = eb32_next(node);
2104 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002105
2106 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002107}
2108
2109/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
2110 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01002111 * return an error in h2c. The caller must have already verified frame length
2112 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02002113 */
2114static int h2c_handle_settings(struct h2c *h2c)
2115{
2116 unsigned int offset;
2117 int error;
2118
Willy Tarreau7838a792019-08-12 18:42:03 +02002119 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2120
Willy Tarreau3421aba2017-07-27 15:41:03 +02002121 if (h2c->dff & H2_F_SETTINGS_ACK) {
2122 if (h2c->dfl) {
2123 error = H2_ERR_FRAME_SIZE_ERROR;
2124 goto fail;
2125 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002126 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002127 }
2128
Willy Tarreau3421aba2017-07-27 15:41:03 +02002129 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002130 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002131 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002132
2133 /* parse the frame */
2134 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002135 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2136 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002137
2138 switch (type) {
2139 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2140 /* we need to update all existing streams with the
2141 * difference from the previous iws.
2142 */
2143 if (arg < 0) { // RFC7540#6.5.2
2144 error = H2_ERR_FLOW_CONTROL_ERROR;
2145 goto fail;
2146 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002147 h2c->miw = arg;
2148 break;
2149 case H2_SETTINGS_MAX_FRAME_SIZE:
2150 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
2151 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002152 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002153 goto fail;
2154 }
2155 h2c->mfs = arg;
2156 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002157 case H2_SETTINGS_ENABLE_PUSH:
2158 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
2159 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002160 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau1b38b462017-12-03 19:02:28 +01002161 goto fail;
2162 }
2163 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002164 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2165 if (h2c->flags & H2_CF_IS_BACK) {
2166 /* the limit is only for the backend; for the frontend it is our limit */
2167 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2168 arg = h2_settings_max_concurrent_streams;
2169 h2c->streams_limit = arg;
2170 }
2171 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002172 }
2173 }
2174
2175 /* need to ACK this frame now */
2176 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002177 done:
2178 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002179 return 1;
2180 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002181 if (!(h2c->flags & H2_CF_IS_BACK))
2182 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002183 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002184 out0:
2185 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 +02002186 return 0;
2187}
2188
2189/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2190 * success or one of the h2_status values.
2191 */
2192static int h2c_ack_settings(struct h2c *h2c)
2193{
2194 struct buffer *res;
2195 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002196 int ret = 0;
2197
2198 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002199
2200 if (h2c_mux_busy(h2c, NULL)) {
2201 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002202 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002203 }
2204
Willy Tarreau9c218e72019-05-26 10:08:28 +02002205 memcpy(str,
2206 "\x00\x00\x00" /* length : 0 (no data) */
2207 "\x04" "\x01" /* type : 4, flags : ACK */
2208 "\x00\x00\x00\x00" /* stream ID */, 9);
2209
Willy Tarreaubcc45952019-05-26 10:05:50 +02002210 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002211 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002212 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002213 h2c->flags |= H2_CF_MUX_MALLOC;
2214 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002215 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002216 }
2217
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002218 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002219 if (unlikely(ret <= 0)) {
2220 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002221 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2222 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002223 h2c->flags |= H2_CF_MUX_MFULL;
2224 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002225 }
2226 else {
2227 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002228 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002229 }
2230 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002231 out:
2232 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002233 return ret;
2234}
2235
Willy Tarreaucf68c782017-10-10 17:11:41 +02002236/* processes a PING frame and schedules an ACK if needed. The caller must pass
2237 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002238 * missing data. The caller must have already verified frame length
2239 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002240 */
2241static int h2c_handle_ping(struct h2c *h2c)
2242{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002243 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002244 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002245 h2c->st0 = H2_CS_FRAME_A;
2246 return 1;
2247}
2248
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002249/* Try to send a window update for stream id <sid> and value <increment>.
2250 * Returns > 0 on success or zero on missing room or failure. It may return an
2251 * error in h2c.
2252 */
2253static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2254{
2255 struct buffer *res;
2256 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002257 int ret = 0;
2258
2259 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002260
2261 if (h2c_mux_busy(h2c, NULL)) {
2262 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002263 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002264 }
2265
Willy Tarreau9c218e72019-05-26 10:08:28 +02002266 /* length: 4, type: 8, flags: none */
2267 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2268 write_n32(str + 5, sid);
2269 write_n32(str + 9, increment);
2270
Willy Tarreaubcc45952019-05-26 10:05:50 +02002271 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002272 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002273 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002274 h2c->flags |= H2_CF_MUX_MALLOC;
2275 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002276 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002277 }
2278
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002279 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002280 if (unlikely(ret <= 0)) {
2281 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002282 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2283 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002284 h2c->flags |= H2_CF_MUX_MFULL;
2285 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002286 }
2287 else {
2288 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002289 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002290 }
2291 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002292 out:
2293 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002294 return ret;
2295}
2296
2297/* try to send pending window update for the connection. It's safe to call it
2298 * with no pending updates. Returns > 0 on success or zero on missing room or
2299 * failure. It may return an error in h2c.
2300 */
2301static int h2c_send_conn_wu(struct h2c *h2c)
2302{
2303 int ret = 1;
2304
Willy Tarreau7838a792019-08-12 18:42:03 +02002305 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2306
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002307 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002308 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002309
Willy Tarreau97aaa672018-12-23 09:49:04 +01002310 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2311 /* increase the advertised connection window to 2G on
2312 * first update.
2313 */
2314 h2c->flags |= H2_CF_WINDOW_OPENED;
2315 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2316 }
2317
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002318 /* send WU for the connection */
2319 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2320 if (ret > 0)
2321 h2c->rcvd_c = 0;
2322
Willy Tarreau7838a792019-08-12 18:42:03 +02002323 out:
2324 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002325 return ret;
2326}
2327
2328/* try to send pending window update for the current dmux stream. It's safe to
2329 * call it with no pending updates. Returns > 0 on success or zero on missing
2330 * room or failure. It may return an error in h2c.
2331 */
2332static int h2c_send_strm_wu(struct h2c *h2c)
2333{
2334 int ret = 1;
2335
Willy Tarreau7838a792019-08-12 18:42:03 +02002336 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2337
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002338 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002339 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002340
2341 /* send WU for the stream */
2342 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2343 if (ret > 0)
2344 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002345 out:
2346 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002347 return ret;
2348}
2349
Willy Tarreaucf68c782017-10-10 17:11:41 +02002350/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2351 * success, 0 on missing data or one of the h2_status values.
2352 */
2353static int h2c_ack_ping(struct h2c *h2c)
2354{
2355 struct buffer *res;
2356 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002357 int ret = 0;
2358
2359 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002360
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002361 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002362 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002363
2364 if (h2c_mux_busy(h2c, NULL)) {
2365 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002366 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002367 }
2368
Willy Tarreaucf68c782017-10-10 17:11:41 +02002369 memcpy(str,
2370 "\x00\x00\x08" /* length : 8 (same payload) */
2371 "\x06" "\x01" /* type : 6, flags : ACK */
2372 "\x00\x00\x00\x00" /* stream ID */, 9);
2373
2374 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002375 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002376
Willy Tarreau9c218e72019-05-26 10:08:28 +02002377 res = br_tail(h2c->mbuf);
2378 retry:
2379 if (!h2_get_buf(h2c, res)) {
2380 h2c->flags |= H2_CF_MUX_MALLOC;
2381 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002382 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002383 }
2384
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002385 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002386 if (unlikely(ret <= 0)) {
2387 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002388 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2389 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002390 h2c->flags |= H2_CF_MUX_MFULL;
2391 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002392 }
2393 else {
2394 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002395 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002396 }
2397 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002398 out:
2399 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002400 return ret;
2401}
2402
Willy Tarreau26f95952017-07-27 17:18:30 +02002403/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2404 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002405 * h2c or h2s. The caller must have already verified frame length and stream ID
2406 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002407 */
2408static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2409{
2410 int32_t inc;
2411 int error;
2412
Willy Tarreau7838a792019-08-12 18:42:03 +02002413 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2414
Willy Tarreau26f95952017-07-27 17:18:30 +02002415 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002416 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002417 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002418
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002419 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002420
2421 if (h2c->dsi != 0) {
2422 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002423
2424 /* it's not an error to receive WU on a closed stream */
2425 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002426 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002427
2428 if (!inc) {
2429 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002430 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002431 goto strm_err;
2432 }
2433
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002434 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002435 error = H2_ERR_FLOW_CONTROL_ERROR;
2436 goto strm_err;
2437 }
2438
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002439 h2s->sws += inc;
2440 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002441 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002442 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002443 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2444 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Olivier Houcharddddfe312018-10-10 18:51:00 +02002445 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002446 }
2447 }
2448 else {
2449 /* connection window update */
2450 if (!inc) {
2451 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002452 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau26f95952017-07-27 17:18:30 +02002453 goto conn_err;
2454 }
2455
2456 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2457 error = H2_ERR_FLOW_CONTROL_ERROR;
2458 goto conn_err;
2459 }
2460
2461 h2c->mws += inc;
2462 }
2463
Willy Tarreau7838a792019-08-12 18:42:03 +02002464 done:
2465 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002466 return 1;
2467
2468 conn_err:
2469 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002470 out0:
2471 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 +02002472 return 0;
2473
2474 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002475 h2s_error(h2s, error);
2476 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002477 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002478 return 0;
2479}
2480
Willy Tarreaue96b0922017-10-30 00:28:29 +01002481/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002482 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2483 * have already verified frame length and stream ID validity. Described in
2484 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002485 */
2486static int h2c_handle_goaway(struct h2c *h2c)
2487{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002488 int last;
2489
Willy Tarreau7838a792019-08-12 18:42:03 +02002490 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002491 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002492 if (b_data(&h2c->dbuf) < h2c->dfl) {
2493 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002494 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002495 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002496
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002497 last = h2_get_n32(&h2c->dbuf, 0);
2498 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002499 if (h2c->last_sid < 0)
2500 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002501 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002502 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002503 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002504}
2505
Willy Tarreau92153fc2017-12-03 19:46:19 +01002506/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002507 * invalid. Returns > 0 on success or zero on missing data. It may return an
2508 * error in h2c. The caller must have already verified frame length and stream
2509 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002510 */
2511static int h2c_handle_priority(struct h2c *h2c)
2512{
Willy Tarreau7838a792019-08-12 18:42:03 +02002513 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2514
Willy Tarreau92153fc2017-12-03 19:46:19 +01002515 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002516 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002517 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002518 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002519 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002520
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002521 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002522 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01002523 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002524 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002525 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002526 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002527 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002528 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002529 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002530}
2531
Willy Tarreaucd234e92017-08-18 10:59:39 +02002532/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002533 * Returns > 0 on success or zero on missing data. The caller must have already
2534 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002535 */
2536static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2537{
Willy Tarreau7838a792019-08-12 18:42:03 +02002538 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2539
Willy Tarreaucd234e92017-08-18 10:59:39 +02002540 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002541 if (b_data(&h2c->dbuf) < h2c->dfl) {
2542 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 +02002543 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002544 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002545
2546 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002547 if (h2s->st == H2_SS_CLOSED) {
2548 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 +02002549 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002550 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002551
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002552 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002553 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002554
2555 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002556 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002557 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002558 }
2559
2560 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002561 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002562 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002563}
2564
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002565/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2566 * It may return an error in h2c or h2s. The caller must consider that the
2567 * return value is the new h2s in case one was allocated (most common case).
2568 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002569 * errors here are reported as connection errors since it's impossible to
2570 * recover from such errors after the compression context has been altered.
2571 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002572static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002573{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002574 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002575 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002576 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002577 int error;
2578
Willy Tarreau7838a792019-08-12 18:42:03 +02002579 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2580
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002581 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002582 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002583
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002584 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002585 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002586
2587 /* now either the frame is complete or the buffer is complete */
2588 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002589 /* The stream exists/existed, this must be a trailers frame */
2590 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002591 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2592 /* unrecoverable error ? */
2593 if (h2c->st0 >= H2_CS_ERROR)
2594 goto out;
2595
2596 if (error == 0)
2597 goto out; // missing data
2598
2599 if (error < 0) {
2600 /* Failed to decode this frame (e.g. too large request)
2601 * but the HPACK decompressor is still synchronized.
2602 */
2603 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2604 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002605 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002606 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002607 goto done;
2608 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002609 /* the connection was already killed by an RST, let's consume
2610 * the data and send another RST.
2611 */
2612 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2613 h2s = (struct h2s*)h2_error_stream;
2614 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002615 }
2616 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2617 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2618 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002619 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002620 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002621 goto conn_err;
2622 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002623 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2624 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002625
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002626 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002627
Willy Tarreau25919232019-01-03 14:48:18 +01002628 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002629 if (h2c->st0 >= H2_CS_ERROR)
2630 goto out;
2631
Willy Tarreau25919232019-01-03 14:48:18 +01002632 if (error <= 0) {
2633 if (error == 0)
2634 goto out; // missing data
2635
2636 /* Failed to decode this stream (e.g. too large request)
2637 * but the HPACK decompressor is still synchronized.
2638 */
2639 h2s = (struct h2s*)h2_error_stream;
2640 goto send_rst;
2641 }
2642
Willy Tarreau22de8d32018-09-05 19:55:58 +02002643 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002644 * positively from h2c_frt_stream_new(), the stream will report the error,
2645 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002646 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002647 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002648 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002649 h2s = (struct h2s*)h2_refused_stream;
2650 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002651 }
2652
2653 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002654 h2s->rxbuf = rxbuf;
2655 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002656 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002657
Willy Tarreau88d138e2019-01-02 19:38:14 +01002658 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002659 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002660 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002661
2662 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002663 if (h2s->st == H2_SS_OPEN)
2664 h2s->st = H2_SS_HREM;
2665 else
2666 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002667 }
2668
Willy Tarreau3a429f02019-01-03 11:41:50 +01002669 /* update the max stream ID if the request is being processed */
2670 if (h2s->id > h2c->max_id)
2671 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002672
Willy Tarreau022e5e52020-09-10 09:33:15 +02002673 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 +01002674 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002675
2676 conn_err:
2677 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002678 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002679
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002680 out:
2681 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002682 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 +01002683 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002684
2685 send_rst:
2686 /* make the demux send an RST for the current stream. We may only
2687 * do this if we're certain that the HEADERS frame was properly
2688 * decompressed so that the HPACK decoder is still kept up to date.
2689 */
2690 h2_release_buf(h2c, &rxbuf);
2691 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002692
Willy Tarreau022e5e52020-09-10 09:33:15 +02002693 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 +02002694 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002695 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002696}
2697
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002698/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2699 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2700 * errors here are reported as connection errors since it's impossible to
2701 * recover from such errors after the compression context has been altered.
2702 */
2703static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2704{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002705 struct buffer rxbuf = BUF_NULL;
2706 unsigned long long body_len = 0;
2707 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002708 int error;
2709
Willy Tarreau7838a792019-08-12 18:42:03 +02002710 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2711
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002712 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002713 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002714
2715 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002716 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002717
Christopher Faulet6884aa32019-09-23 15:28:20 +02002718 if (h2s->st != H2_SS_CLOSED) {
2719 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2720 }
2721 else {
2722 /* the connection was already killed by an RST, let's consume
2723 * the data and send another RST.
2724 */
2725 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002726 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002727 h2c->st0 = H2_CS_FRAME_E;
2728 goto send_rst;
2729 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002730
Willy Tarreau25919232019-01-03 14:48:18 +01002731 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002732 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002733 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002734
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002735 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2736 /* RFC7540#5.1 */
2737 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2738 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002739 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002740 }
2741
Willy Tarreau25919232019-01-03 14:48:18 +01002742 if (error <= 0) {
2743 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002744 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002745
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002746 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002747 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002748 h2c->st0 = H2_CS_FRAME_E;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002749 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002750 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002751 }
2752
Christopher Fauletfa922f02019-05-07 10:55:17 +02002753 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002754 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002755
Willy Tarreau927b88b2019-03-04 08:03:25 +01002756 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002757 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002758 else if (h2s->flags & H2_SF_ES_RCVD) {
2759 if (h2s->st == H2_SS_OPEN)
2760 h2s->st = H2_SS_HREM;
2761 else if (h2s->st == H2_SS_HLOC)
2762 h2s_close(h2s);
2763 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002764
Willy Tarreau022e5e52020-09-10 09:33:15 +02002765 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 +02002766 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002767 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002768 fail:
2769 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2770 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002771
2772 send_rst:
2773 /* make the demux send an RST for the current stream. We may only
2774 * do this if we're certain that the HEADERS frame was properly
2775 * decompressed so that the HPACK decoder is still kept up to date.
2776 */
2777 h2_release_buf(h2c, &rxbuf);
2778 h2c->st0 = H2_CS_FRAME_E;
2779
Willy Tarreau022e5e52020-09-10 09:33:15 +02002780 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 +02002781 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2782 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002783}
2784
Willy Tarreau454f9052017-10-26 19:40:35 +02002785/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2786 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2787 */
2788static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2789{
2790 int error;
2791
Willy Tarreau7838a792019-08-12 18:42:03 +02002792 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2793
Willy Tarreau454f9052017-10-26 19:40:35 +02002794 /* note that empty DATA frames are perfectly valid and sometimes used
2795 * to signal an end of stream (with the ES flag).
2796 */
2797
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002798 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002799 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002800
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002801 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002802 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002803
2804 /* now either the frame is complete or the buffer is complete */
2805
Willy Tarreau454f9052017-10-26 19:40:35 +02002806 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2807 /* RFC7540#6.1 */
2808 error = H2_ERR_STREAM_CLOSED;
2809 goto strm_err;
2810 }
2811
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002812 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002813 /* RFC7540#8.1.2 */
2814 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002815 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002816 goto strm_err;
2817 }
2818
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002819 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002820 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002821
Willy Tarreau454f9052017-10-26 19:40:35 +02002822 /* call the upper layers to process the frame, then let the upper layer
2823 * notify the stream about any change.
2824 */
2825 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002826 /* The upper layer has already closed, this may happen on
2827 * 4xx/redirects during POST, or when receiving a response
2828 * from an H2 server after the client has aborted.
2829 */
2830 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002831 goto strm_err;
2832 }
2833
Willy Tarreau8f650c32017-11-21 19:36:21 +01002834 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002835 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002836
Willy Tarreau721c9742017-11-07 11:05:42 +01002837 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002838 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002839 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002840 }
2841
2842 /* check for completion : the callee will change this to FRAME_A or
2843 * FRAME_H once done.
2844 */
2845 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002846 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002847
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002848 /* last frame */
2849 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002850 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002851 if (h2s->st == H2_SS_OPEN)
2852 h2s->st = H2_SS_HREM;
2853 else
2854 h2s_close(h2s);
2855
Willy Tarreau1915ca22019-01-24 11:49:37 +01002856 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2857 /* RFC7540#8.1.2 */
2858 error = H2_ERR_PROTOCOL_ERROR;
Amaury Denoyellea8879232020-10-27 17:16:03 +01002859 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau1915ca22019-01-24 11:49:37 +01002860 goto strm_err;
2861 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002862 }
2863
Willy Tarreau7838a792019-08-12 18:42:03 +02002864 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002865 return 1;
2866
Willy Tarreau454f9052017-10-26 19:40:35 +02002867 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002868 h2s_error(h2s, error);
2869 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002870 fail:
2871 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 +02002872 return 0;
2873}
2874
Willy Tarreau63864812019-08-07 14:25:20 +02002875/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2876 * valid for the current stream state. This is needed only after parsing the
2877 * frame header but in practice it can be performed at any time during
2878 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2879 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2880 */
2881static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2882{
Willy Tarreau7838a792019-08-12 18:42:03 +02002883 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2884
Willy Tarreau63864812019-08-07 14:25:20 +02002885 if (h2s->st == H2_SS_IDLE &&
2886 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2887 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2888 * this state MUST be treated as a connection error
2889 */
2890 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002891 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002892 /* only log if no other stream can report the error */
2893 sess_log(h2c->conn->owner);
2894 }
Amaury Denoyellea8879232020-10-27 17:16:03 +01002895 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +02002896 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 +02002897 return 0;
2898 }
2899
Willy Tarreau57a18162019-11-24 14:57:53 +01002900 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2901 /* only PUSH_PROMISE would be permitted here */
2902 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002903 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau57a18162019-11-24 14:57:53 +01002904 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2905 return 0;
2906 }
2907
Willy Tarreau63864812019-08-07 14:25:20 +02002908 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2909 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2910 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2911 * this state MUST be treated as a stream error.
2912 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2913 * PUSH_PROMISE/CONTINUATION cause connection errors.
2914 */
Amaury Denoyellea8879232020-10-27 17:16:03 +01002915 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreau63864812019-08-07 14:25:20 +02002916 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002917 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
2918 }
2919 else {
Willy Tarreau63864812019-08-07 14:25:20 +02002920 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Amaury Denoyellea8879232020-10-27 17:16:03 +01002921 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002922 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 +02002923 return 0;
2924 }
2925
2926 /* Below the management of frames received in closed state is a
2927 * bit hackish because the spec makes strong differences between
2928 * streams closed by receiving RST, sending RST, and seeing ES
2929 * in both directions. In addition to this, the creation of a
2930 * new stream reusing the identifier of a closed one will be
2931 * detected here. Given that we cannot keep track of all closed
2932 * streams forever, we consider that unknown closed streams were
2933 * closed on RST received, which allows us to respond with an
2934 * RST without breaking the connection (eg: to abort a transfer).
2935 * Some frames have to be silently ignored as well.
2936 */
2937 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
2938 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
2939 /* #5.1.1: The identifier of a newly
2940 * established stream MUST be numerically
2941 * greater than all streams that the initiating
2942 * endpoint has opened or reserved. This
2943 * governs streams that are opened using a
2944 * HEADERS frame and streams that are reserved
2945 * using PUSH_PROMISE. An endpoint that
2946 * receives an unexpected stream identifier
2947 * MUST respond with a connection error.
2948 */
2949 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002950 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 +02002951 return 0;
2952 }
2953
Willy Tarreau4c08f122019-09-26 08:47:15 +02002954 if (h2s->flags & H2_SF_RST_RCVD &&
2955 !(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 +02002956 /* RFC7540#5.1:closed: an endpoint that
2957 * receives any frame other than PRIORITY after
2958 * receiving a RST_STREAM MUST treat that as a
2959 * stream error of type STREAM_CLOSED.
2960 *
2961 * Note that old streams fall into this category
2962 * and will lead to an RST being sent.
2963 *
2964 * However, we cannot generalize this to all frame types. Those
2965 * carrying compression state must still be processed before
2966 * being dropped or we'll desynchronize the decoder. This can
2967 * happen with request trailers received after sending an
2968 * RST_STREAM, or with header/trailers responses received after
2969 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02002970 *
2971 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002972 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02002973 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02002974 */
2975 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2976 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002977 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 +02002978 return 0;
2979 }
2980
2981 /* RFC7540#5.1:closed: if this state is reached as a
2982 * result of sending a RST_STREAM frame, the peer that
2983 * receives the RST_STREAM might have already sent
2984 * frames on the stream that cannot be withdrawn. An
2985 * endpoint MUST ignore frames that it receives on
2986 * closed streams after it has sent a RST_STREAM
2987 * frame. An endpoint MAY choose to limit the period
2988 * over which it ignores frames and treat frames that
2989 * arrive after this time as being in error.
2990 */
2991 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
2992 /* RFC7540#5.1:closed: any frame other than
2993 * PRIO/WU/RST in this state MUST be treated as
2994 * a connection error
2995 */
2996 if (h2c->dft != H2_FT_RST_STREAM &&
2997 h2c->dft != H2_FT_PRIORITY &&
2998 h2c->dft != H2_FT_WINDOW_UPDATE) {
2999 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02003000 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 +02003001 return 0;
3002 }
3003 }
3004 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003005 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02003006 return 1;
3007}
3008
Willy Tarreaubc933932017-10-09 16:21:43 +02003009/* process Rx frames to be demultiplexed */
3010static void h2_process_demux(struct h2c *h2c)
3011{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003012 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003013 struct h2_fh hdr;
3014 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003015 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02003016
Willy Tarreau7838a792019-08-12 18:42:03 +02003017 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3018
Willy Tarreau081d4722017-05-16 21:51:05 +02003019 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02003020 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02003021
3022 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3023 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003024 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02003025 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02003026 goto out;
3027
Willy Tarreau52eed752017-09-22 15:05:09 +02003028 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
3029 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003030 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003031 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003032 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02003033 sess_log(h2c->conn->owner);
3034 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003035 goto fail;
3036 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003037 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003038
3039 h2c->max_id = 0;
3040 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003041 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02003042 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003043
3044 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003045 /* ensure that what is pending is a valid SETTINGS frame
3046 * without an ACK.
3047 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003048 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 +02003049 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003050 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02003051 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003052 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 +02003053 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003054 if (!(h2c->flags & H2_CF_IS_BACK))
3055 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02003056 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003057 goto fail;
3058 }
3059
3060 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
3061 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003062 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 +02003063 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3064 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003065 if (!(h2c->flags & H2_CF_IS_BACK))
3066 sess_log(h2c->conn->owner);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003067 HA_ATOMIC_ADD(&h2c->px_counters->conn_proto_err, 1);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003068 goto fail;
3069 }
3070
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003071 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003072 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003073 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 +02003074 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3075 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003076 if (!(h2c->flags & H2_CF_IS_BACK))
3077 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003078 goto fail;
3079 }
3080
Willy Tarreau3bf69182018-12-21 15:34:50 +01003081 /* that's OK, switch to FRAME_P to process it. This is
3082 * a SETTINGS frame whose header has already been
3083 * deleted above.
3084 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01003085 padlen = 0;
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003086 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003087 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02003088 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003089 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003090
3091 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02003092 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02003093 int ret = 0;
3094
Willy Tarreau7838a792019-08-12 18:42:03 +02003095 if (!b_data(&h2c->dbuf)) {
3096 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
3097 break;
3098 }
3099
3100 if (h2c->st0 >= H2_CS_ERROR) {
3101 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003102 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003103 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003104
3105 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02003106 h2c->rcvd_s = 0;
3107
Willy Tarreau7838a792019-08-12 18:42:03 +02003108 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01003109 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02003110 break;
3111
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02003112 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003113 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 +02003114 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003115 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02003116 /* only log if no other stream can report the error */
3117 sess_log(h2c->conn->owner);
3118 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003119 break;
3120 }
3121
Christopher Fauletdd2a5622019-06-18 12:22:38 +02003122 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003123 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
3124 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
3125 * we read the pad length and drop it from the remaining
3126 * payload (one byte + the 9 remaining ones = 10 total
3127 * removed), so we have a frame payload starting after the
3128 * pad len. Flow controlled frames (DATA) also count the
3129 * padlen in the flow control, so it must be adjusted.
3130 */
3131 if (hdr.len < 1) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003132 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 +01003133 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003134 if (!(h2c->flags & H2_CF_IS_BACK))
3135 sess_log(h2c->conn->owner);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003136 goto fail;
3137 }
3138 hdr.len--;
3139
3140 if (b_data(&h2c->dbuf) < 10)
3141 break; // missing padlen
3142
3143 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3144
3145 if (padlen > hdr.len) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003146 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 +01003147 /* RFC7540#6.1 : pad length = length of
3148 * frame payload or greater => error.
3149 */
3150 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003151 if (!(h2c->flags & H2_CF_IS_BACK))
3152 sess_log(h2c->conn->owner);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003153 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003154 goto fail;
3155 }
3156
3157 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3158 h2c->rcvd_c++;
3159 h2c->rcvd_s++;
3160 }
3161 b_del(&h2c->dbuf, 1);
3162 }
3163 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003164
3165 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003166 h2c->dfl = hdr.len;
3167 h2c->dsi = hdr.sid;
3168 h2c->dft = hdr.ft;
3169 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003170 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003171 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 +02003172 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003173
3174 /* check for minimum basic frame format validity */
3175 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3176 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003177 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 +01003178 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003179 if (!(h2c->flags & H2_CF_IS_BACK))
3180 sess_log(h2c->conn->owner);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003181 goto fail;
3182 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003183 }
3184
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003185 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3186 * H2_CS_FRAME_P indicates an incomplete previous operation
3187 * (most often the first attempt) and requires some validity
3188 * checks for the frame and the current state. The two other
3189 * ones are set after completion (or abortion) and must skip
3190 * validity checks.
3191 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003192 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3193
Willy Tarreau567beb82018-12-18 16:52:44 +01003194 if (tmp_h2s != h2s && h2s && h2s->cs &&
3195 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003196 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003197 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003198 (h2s->flags & H2_SF_ES_RCVD) ||
3199 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003200 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003201 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 +01003202 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003203 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003204 }
3205 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003206
Willy Tarreau63864812019-08-07 14:25:20 +02003207 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003208 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3209 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003210 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003211 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003212
Willy Tarreau7e98c052017-10-10 15:56:59 +02003213 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003214 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003215 if (h2c->st0 == H2_CS_FRAME_P) {
3216 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003217 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003218 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003219 HA_ATOMIC_ADD(&h2c->px_counters->settings_rcvd, 1);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003220
Willy Tarreau7838a792019-08-12 18:42:03 +02003221 if (h2c->st0 == H2_CS_FRAME_A) {
3222 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 +02003223 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003224 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003225 break;
3226
Willy Tarreaucf68c782017-10-10 17:11:41 +02003227 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003228 if (h2c->st0 == H2_CS_FRAME_P) {
3229 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003230 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003231 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003232
Willy Tarreau7838a792019-08-12 18:42:03 +02003233 if (h2c->st0 == H2_CS_FRAME_A) {
3234 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 +02003235 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003236 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003237 break;
3238
Willy Tarreau26f95952017-07-27 17:18:30 +02003239 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003240 if (h2c->st0 == H2_CS_FRAME_P) {
3241 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 +02003242 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003243 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003244 break;
3245
Willy Tarreau61290ec2017-10-17 08:19:21 +02003246 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003247 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003248 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3249 * frames' parsers consume all following CONTINUATION
3250 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003251 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003252 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 +01003253 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003254 if (!(h2c->flags & H2_CF_IS_BACK))
3255 sess_log(h2c->conn->owner);
Amaury Denoyellea8879232020-10-27 17:16:03 +01003256 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01003257 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003258
Willy Tarreau13278b42017-10-13 19:23:14 +02003259 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003260 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003261 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003262 if (h2c->flags & H2_CF_IS_BACK)
3263 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3264 else
3265 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003266 if (tmp_h2s) {
3267 h2s = tmp_h2s;
3268 ret = 1;
3269 }
3270 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003271 HA_ATOMIC_ADD(&h2c->px_counters->headers_rcvd, 1);
Willy Tarreau13278b42017-10-13 19:23:14 +02003272 break;
3273
Willy Tarreau454f9052017-10-26 19:40:35 +02003274 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003275 if (h2c->st0 == H2_CS_FRAME_P) {
3276 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003277 ret = h2c_frt_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003278 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003279 HA_ATOMIC_ADD(&h2c->px_counters->data_rcvd, 1);
Willy Tarreau454f9052017-10-26 19:40:35 +02003280
Willy Tarreau7838a792019-08-12 18:42:03 +02003281 if (h2c->st0 == H2_CS_FRAME_A) {
3282 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 +02003283 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003284 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003285 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003286
Willy Tarreau92153fc2017-12-03 19:46:19 +01003287 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003288 if (h2c->st0 == H2_CS_FRAME_P) {
3289 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003290 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003291 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003292 break;
3293
Willy Tarreaucd234e92017-08-18 10:59:39 +02003294 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003295 if (h2c->st0 == H2_CS_FRAME_P) {
3296 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 +02003297 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003298 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003299 HA_ATOMIC_ADD(&h2c->px_counters->rst_stream_rcvd, 1);
Willy Tarreaucd234e92017-08-18 10:59:39 +02003300 break;
3301
Willy Tarreaue96b0922017-10-30 00:28:29 +01003302 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003303 if (h2c->st0 == H2_CS_FRAME_P) {
3304 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003305 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003306 }
Amaury Denoyelle2dec1eb2020-10-27 17:16:02 +01003307 HA_ATOMIC_ADD(&h2c->px_counters->goaway_rcvd, 1);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003308 break;
3309
Willy Tarreau1c661982017-10-30 13:52:01 +01003310 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003311 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003312 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003313 /* drop frames that we ignore. They may be larger than
3314 * the buffer so we drain all of their contents until
3315 * we reach the end.
3316 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003317 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3318 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003319 h2c->dfl -= ret;
3320 ret = h2c->dfl == 0;
3321 }
3322
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003323 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003324 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003325 if (h2s->st == H2_SS_ERROR) {
3326 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 +01003327 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003328 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003329
Willy Tarreau7838a792019-08-12 18:42:03 +02003330 if (h2c->st0 == H2_CS_FRAME_E) {
3331 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 +01003332 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003333 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003334
Willy Tarreau7e98c052017-10-10 15:56:59 +02003335 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003336 if (ret <= 0) {
3337 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003338 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003339 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003340
3341 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003342 if (h2c->dfl)
3343 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003344 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3345 b_del(&h2c->dbuf, ret);
3346 h2c->dfl -= ret;
3347 if (!h2c->dfl) {
3348 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3349 h2c->st0 = H2_CS_FRAME_H;
3350 h2c->dsi = -1;
3351 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003352 }
3353 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003354
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003355 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003356 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3357 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003358 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003359 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003360
Willy Tarreau52eed752017-09-22 15:05:09 +02003361 fail:
3362 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01003363 if (h2s && h2s->cs &&
3364 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003365 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003366 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003367 (h2s->flags & H2_SF_ES_RCVD) ||
3368 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003369 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003370 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 +01003371 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003372 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003373 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003374
Willy Tarreau7838a792019-08-12 18:42:03 +02003375 if (old_iw != h2c->miw) {
3376 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003377 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003378 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003379
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003380 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003381 out:
3382 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreaubc933932017-10-09 16:21:43 +02003383}
3384
Willy Tarreau989539b2020-01-10 17:01:29 +01003385/* resume each h2s eligible for sending in list head <head> */
3386static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3387{
3388 struct h2s *h2s, *h2s_back;
3389
3390 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3391
3392 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3393 if (h2c->mws <= 0 ||
3394 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3395 h2c->st0 >= H2_CS_ERROR)
3396 break;
3397
3398 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003399
Willy Tarreaud9464162020-01-10 18:25:07 +01003400 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003401 continue;
3402
Willy Tarreau5723f292020-01-10 15:16:57 +01003403 /* If the sender changed his mind and unsubscribed, let's just
3404 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003405 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003406 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3407 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003408 LIST_DEL_INIT(&h2s->list);
3409 continue;
3410 }
3411
Willy Tarreauf96508a2020-01-10 11:12:48 +01003412 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003413 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003414 tasklet_wakeup(h2s->subs->tasklet);
3415 h2s->subs->events &= ~SUB_RETRY_SEND;
3416 if (!h2s->subs->events)
3417 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003418 }
3419 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3420 tasklet_wakeup(h2s->shut_tl);
3421 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003422 }
3423
3424 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3425}
3426
Willy Tarreaubc933932017-10-09 16:21:43 +02003427/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3428 * the end.
3429 */
3430static int h2_process_mux(struct h2c *h2c)
3431{
Willy Tarreau7838a792019-08-12 18:42:03 +02003432 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3433
Willy Tarreau01b44822018-10-03 14:26:37 +02003434 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3435 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3436 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3437 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003438 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003439 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003440 goto fail;
3441 }
3442 h2c->st0 = H2_CS_SETTINGS1;
3443 }
3444 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003445 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003446 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003447 }
3448
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003449 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003450 if (h2c->rcvd_s > 0 &&
3451 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3452 h2c_send_strm_wu(h2c) < 0)
3453 goto fail;
3454
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003455 if (h2c->rcvd_c > 0 &&
3456 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3457 h2c_send_conn_wu(h2c) < 0)
3458 goto fail;
3459
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003460 /* First we always process the flow control list because the streams
3461 * waiting there were already elected for immediate emission but were
3462 * blocked just on this.
3463 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003464 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3465 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003466
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003467 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003468 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003469 if (h2c->st0 == H2_CS_ERROR) {
3470 if (h2c->max_id >= 0) {
3471 h2c_send_goaway_error(h2c, NULL);
3472 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003473 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003474 }
3475
3476 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3477 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003478 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003479 done:
3480 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3481 return 1;
3482 out0:
3483 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3484 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003485}
3486
Willy Tarreau62f52692017-10-08 23:01:42 +02003487
Willy Tarreau479998a2018-11-18 06:30:59 +01003488/* Attempt to read data, and subscribe if none available.
3489 * The function returns 1 if data has been received, otherwise zero.
3490 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003491static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003492{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003493 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003494 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003495 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003496 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003497
Willy Tarreau7838a792019-08-12 18:42:03 +02003498 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3499
3500 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3501 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003502 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003503 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003504
Willy Tarreau7838a792019-08-12 18:42:03 +02003505 if (!h2_recv_allowed(h2c)) {
3506 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003507 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003508 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003509
Willy Tarreau44e973f2018-03-01 17:49:30 +01003510 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003511 if (!buf) {
3512 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003513 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003514 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003515 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003516
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003517 b_realign_if_empty(buf);
3518 if (!b_data(buf)) {
3519 /* try to pre-align the buffer like the
3520 * rxbufs will be to optimize memory copies. We'll make
3521 * sure that the frame header lands at the end of the
3522 * HTX block to alias it upon recv. We cannot use the
3523 * head because rcv_buf() will realign the buffer if
3524 * it's empty. Thus we cheat and pretend we already
3525 * have a few bytes there.
3526 */
3527 max = buf_room_for_htx_data(buf) + 9;
3528 buf->head = sizeof(struct htx) - 9;
3529 }
3530 else
3531 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003532
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003533 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003534
Willy Tarreau7838a792019-08-12 18:42:03 +02003535 if (max && !ret && h2_recv_allowed(h2c)) {
3536 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003537 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003538 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003539 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003540
Olivier Houcharda1411e62018-08-17 18:42:48 +02003541 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003542 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003543 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003544 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003545 }
3546
Willy Tarreau7838a792019-08-12 18:42:03 +02003547 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003548 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003549 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003550 }
3551
3552 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003553 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003554}
3555
Willy Tarreau479998a2018-11-18 06:30:59 +01003556/* Try to send data if possible.
3557 * The function returns 1 if data have been sent, otherwise zero.
3558 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003559static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003560{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003561 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003562 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003563 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003564
Willy Tarreau7838a792019-08-12 18:42:03 +02003565 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003566
Willy Tarreau7838a792019-08-12 18:42:03 +02003567 if (conn->flags & CO_FL_ERROR) {
3568 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3569 return 1;
3570 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003571
Willy Tarreau911db9b2020-01-23 16:27:54 +01003572 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003573 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003574 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003575 }
3576
Willy Tarreaubc933932017-10-09 16:21:43 +02003577 /* This loop is quite simple : it tries to fill as much as it can from
3578 * pending streams into the existing buffer until it's reportedly full
3579 * or the end of send requests is reached. Then it tries to send this
3580 * buffer's contents out, marks it not full if at least one byte could
3581 * be sent, and tries again.
3582 *
3583 * The snd_buf() function normally takes a "flags" argument which may
3584 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3585 * data immediately comes and CO_SFL_STREAMER to indicate that the
3586 * connection is streaming lots of data (used to increase TLS record
3587 * size at the expense of latency). The former can be sent any time
3588 * there's a buffer full flag, as it indicates at least one stream
3589 * attempted to send and failed so there are pending data. An
3590 * alternative would be to set it as long as there's an active stream
3591 * but that would be problematic for ACKs until we have an absolute
3592 * guarantee that all waiters have at least one byte to send. The
3593 * latter should possibly not be set for now.
3594 */
3595
3596 done = 0;
3597 while (!done) {
3598 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003599 unsigned int released = 0;
3600 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003601
3602 /* fill as much as we can into the current buffer */
3603 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3604 done = h2_process_mux(h2c);
3605
Olivier Houchard2b094432019-01-29 18:28:36 +01003606 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003607 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003608
Christopher Faulet9a3d3fc2020-10-22 16:24:58 +02003609 if ((conn->flags & (CO_FL_SOCK_WR_SH|CO_FL_ERROR)) ||
3610 (h2c->st0 == H2_CS_ERROR2) || (h2c->flags & H2_CF_GOAWAY_FAILED))
Willy Tarreaubc933932017-10-09 16:21:43 +02003611 break;
3612
3613 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3614 flags |= CO_SFL_MSG_MORE;
3615
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003616 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3617 if (b_data(buf)) {
3618 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003619 if (!ret) {
3620 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003621 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003622 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003623 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003624 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003625 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003626 if (b_data(buf)) {
3627 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003628 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003629 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003630 }
3631 b_free(buf);
3632 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003633 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003634
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003635 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003636 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003637
Willy Tarreaubc933932017-10-09 16:21:43 +02003638 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003639 if (sent)
3640 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003641 }
3642
Willy Tarreaua2af5122017-10-09 11:56:46 +02003643 if (conn->flags & CO_FL_SOCK_WR_SH) {
3644 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003645 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003646 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003647 /* We're not full anymore, so we can wake any task that are waiting
3648 * for us.
3649 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003650 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3651 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003652
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003653 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003654 if (!br_data(h2c->mbuf)) {
3655 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003656 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003657 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003658schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003659 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3660 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003661 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003662 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003663
Willy Tarreau7838a792019-08-12 18:42:03 +02003664 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003665 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003666}
3667
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003668/* this is the tasklet referenced in h2c->wait_event.tasklet */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003669static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
3670{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003671 struct connection *conn;
3672 struct tasklet *tl = (struct tasklet *)t;
3673 int conn_in_list;
3674 struct h2c *h2c;
Olivier Houchard7505f942018-08-21 18:10:44 +02003675 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003676
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003677
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003678 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003679 if (t->context == NULL) {
3680 /* The connection has been taken over by another thread,
3681 * we're no longer responsible for it, so just free the
3682 * tasklet, and do nothing.
3683 */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003684 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003685 tasklet_free(tl);
Willy Tarreau38468772020-06-28 00:31:13 +02003686 goto leave;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003687 }
3688 h2c = ctx;
3689 conn = h2c->conn;
3690
3691 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3692
3693 conn_in_list = conn->flags & CO_FL_LIST_MASK;
3694
3695 /* Remove the connection from the list, to be sure nobody attempts
3696 * to use it while we handle the I/O events
3697 */
3698 if (conn_in_list)
3699 MT_LIST_DEL(&conn->list);
3700
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003701 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau7838a792019-08-12 18:42:03 +02003702
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003703 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003704 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003705 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003706 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003707 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003708 ret = h2_process(h2c);
3709
3710 /* If we were in an idle list, we want to add it back into it,
3711 * unless h2_process() returned -1, which mean it has destroyed
3712 * the connection (testing !ret is enough, if h2_process() wasn't
3713 * called then ret will be 0 anyway.
3714 */
3715 if (!ret && conn_in_list) {
3716 struct server *srv = objt_server(conn->target);
3717
3718 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003719 MT_LIST_ADDQ(&srv->safe_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003720 else
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003721 MT_LIST_ADDQ(&srv->idle_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003722 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003723
Willy Tarreau38468772020-06-28 00:31:13 +02003724leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003725 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003726 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003727}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003728
Willy Tarreau62f52692017-10-08 23:01:42 +02003729/* callback called on any event by the connection handler.
3730 * It applies changes and returns zero, or < 0 if it wants immediate
3731 * destruction of the connection (which normally doesn not happen in h2).
3732 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003733static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003734{
Olivier Houchard7505f942018-08-21 18:10:44 +02003735 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003736
Willy Tarreau7838a792019-08-12 18:42:03 +02003737 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3738
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003739 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003740 h2_process_demux(h2c);
3741
3742 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003743 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003744
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003745 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003746 h2c->flags &= ~H2_CF_DEM_DFULL;
3747 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003748 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003749
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003750 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003751 /* frontend is stopping, reload likely in progress, let's try
3752 * to announce a graceful shutdown if not yet done. We don't
3753 * care if it fails, it will be tried again later.
3754 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003755 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003756 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3757 if (h2c->last_sid < 0)
3758 h2c->last_sid = (1U << 31) - 1;
3759 h2c_send_goaway_error(h2c, NULL);
3760 }
3761 }
3762
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003763 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003764 * If we received early data, and the handshake is done, wake
3765 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003766 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003767 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003768 (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 +01003769 struct eb32_node *node;
3770 struct h2s *h2s;
3771
3772 h2c->flags |= H2_CF_WAIT_FOR_HS;
3773 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3774
3775 while (node) {
3776 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003777 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003778 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003779 node = eb32_next(node);
3780 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003781 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003782
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003783 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003784 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3785 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3786 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003787 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003788
3789 if (eb_is_empty(&h2c->streams_by_id)) {
3790 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003791 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003792 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003793 return -1;
3794 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003795
3796 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003797 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003798 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003799 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003800 }
3801 else if (h2c->st0 == H2_CS_ERROR) {
3802 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003803 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003804 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003805 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003806 }
3807
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003808 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003809 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003810
Olivier Houchard53216e72018-10-10 15:46:36 +02003811 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3812 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3813 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003814 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003815 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3816 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003817 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003818
Willy Tarreau3f133572017-10-31 19:21:06 +01003819 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003820 if (h2c_may_expire(h2c))
3821 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3822 else
3823 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003824 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003825 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003826
Olivier Houchard7505f942018-08-21 18:10:44 +02003827 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003828 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003829 return 0;
3830}
3831
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003832/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003833static int h2_wake(struct connection *conn)
3834{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003835 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003836 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003837
Willy Tarreau7838a792019-08-12 18:42:03 +02003838 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3839 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003840 if (ret >= 0)
3841 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003842 TRACE_LEAVE(H2_EV_H2C_WAKE);
3843 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003844}
3845
Willy Tarreauea392822017-10-31 10:02:25 +01003846/* Connection timeout management. The principle is that if there's no receipt
3847 * nor sending for a certain amount of time, the connection is closed. If the
3848 * MUX buffer still has lying data or is not allocatable, the connection is
3849 * immediately killed. If it's allocatable and empty, we attempt to send a
3850 * GOAWAY frame.
3851 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003852static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003853{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003854 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003855 int expired = tick_is_expired(t->expire, now_ms);
3856
Willy Tarreau7838a792019-08-12 18:42:03 +02003857 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3858
Willy Tarreaubd42e922020-06-30 11:19:23 +02003859 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003860 /* Make sure nobody stole the connection from us */
3861 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3862
3863 /* Somebody already stole the connection from us, so we should not
3864 * free it, we just have to free the task.
3865 */
3866 if (!t->context) {
3867 h2c = NULL;
Willy Tarreau46ac7812020-07-04 07:16:18 +02003868 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003869 goto do_leave;
3870 }
3871
3872
Willy Tarreaubd42e922020-06-30 11:19:23 +02003873 if (!expired) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003874 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003875 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3876 return t;
3877 }
Willy Tarreauea392822017-10-31 10:02:25 +01003878
Willy Tarreaubd42e922020-06-30 11:19:23 +02003879 if (!h2c_may_expire(h2c)) {
3880 /* we do still have streams but all of them are idle, waiting
3881 * for the data layer, so we must not enforce the timeout here.
3882 */
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003883 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003884 t->expire = TICK_ETERNITY;
3885 return t;
3886 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003887
Willy Tarreaubd42e922020-06-30 11:19:23 +02003888 /* We're about to destroy the connection, so make sure nobody attempts
3889 * to steal it from us.
3890 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02003891 if (h2c->conn->flags & CO_FL_LIST_MASK)
3892 MT_LIST_DEL(&h2c->conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003893
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003894 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003895 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003896
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003897do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02003898 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003899
3900 if (!h2c) {
3901 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003902 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02003903 return NULL;
3904 }
3905
3906 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003907 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003908 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003909
Willy Tarreau662fafc2019-05-26 09:43:07 +02003910 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003911 /* don't even try to send a GOAWAY, the buffer is stuck */
3912 h2c->flags |= H2_CF_GOAWAY_FAILED;
3913 }
3914
3915 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003916 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003917 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3918 h2c->flags |= H2_CF_GOAWAY_FAILED;
3919
Willy Tarreau662fafc2019-05-26 09:43:07 +02003920 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003921 unsigned int released = 0;
3922 struct buffer *buf;
3923
3924 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3925 if (b_data(buf)) {
3926 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3927 if (!ret)
3928 break;
3929 b_del(buf, ret);
3930 if (b_data(buf))
3931 break;
3932 b_free(buf);
3933 released++;
3934 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003935 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003936
3937 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003938 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003939 }
Willy Tarreauea392822017-10-31 10:02:25 +01003940
Willy Tarreau4481e262019-10-31 15:36:30 +01003941 /* in any case this connection must not be considered idle anymore */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003942 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003943 MT_LIST_DEL((struct mt_list *)&h2c->conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003944 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003945
Willy Tarreau0975f112018-03-29 15:22:59 +02003946 /* either we can release everything now or it will be done later once
3947 * the last stream closes.
3948 */
3949 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003950 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003951
Willy Tarreau7838a792019-08-12 18:42:03 +02003952 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01003953 return NULL;
3954}
3955
3956
Willy Tarreau62f52692017-10-08 23:01:42 +02003957/*******************************************/
3958/* functions below are used by the streams */
3959/*******************************************/
3960
3961/*
3962 * Attach a new stream to a connection
3963 * (Used for outgoing connections)
3964 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003965static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003966{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003967 struct conn_stream *cs;
3968 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003969 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003970
Willy Tarreau7838a792019-08-12 18:42:03 +02003971 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02003972 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02003973 if (!cs) {
3974 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003975 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003976 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01003977 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003978 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003979 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003980 cs_free(cs);
3981 return NULL;
3982 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003983 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003984 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003985}
3986
Willy Tarreaufafd3982018-11-18 21:29:20 +01003987/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3988 * We have to scan because we may have some orphan streams. It might be
3989 * beneficial to scan backwards from the end to reduce the likeliness to find
3990 * orphans.
3991 */
3992static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3993{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003994 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003995 struct h2s *h2s;
3996 struct eb32_node *node;
3997
3998 node = eb32_first(&h2c->streams_by_id);
3999 while (node) {
4000 h2s = container_of(node, struct h2s, by_id);
4001 if (h2s->cs)
4002 return h2s->cs;
4003 node = eb32_next(node);
4004 }
4005 return NULL;
4006}
4007
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02004008static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
4009{
4010 int ret = 0;
4011 struct h2c *h2c = conn->ctx;
4012
4013 switch (mux_ctl) {
4014 case MUX_STATUS:
4015 /* Only consider the mux to be ready if we're done with
4016 * the preface and settings, and we had no error.
4017 */
4018 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
4019 ret |= MUX_STATUS_READY;
4020 return ret;
4021 default:
4022 return -1;
4023 }
4024}
4025
Willy Tarreau62f52692017-10-08 23:01:42 +02004026/*
Olivier Houchard060ed432018-11-06 16:32:42 +01004027 * Destroy the mux and the associated connection, if it is no longer used
4028 */
Christopher Faulet73c12072019-04-08 11:23:22 +02004029static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01004030{
Christopher Faulet73c12072019-04-08 11:23:22 +02004031 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01004032
Willy Tarreau7838a792019-08-12 18:42:03 +02004033 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02004034 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02004035 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02004036 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01004037}
4038
4039/*
Willy Tarreau62f52692017-10-08 23:01:42 +02004040 * Detach the stream from the connection and possibly release the connection.
4041 */
4042static void h2_detach(struct conn_stream *cs)
4043{
Willy Tarreau60935142017-10-16 18:11:19 +02004044 struct h2s *h2s = cs->ctx;
4045 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01004046 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004047
Willy Tarreau7838a792019-08-12 18:42:03 +02004048 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
4049
Willy Tarreau60935142017-10-16 18:11:19 +02004050 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004051 if (!h2s) {
4052 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02004053 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004054 }
Willy Tarreau60935142017-10-16 18:11:19 +02004055
Willy Tarreaud9464162020-01-10 18:25:07 +01004056 /* there's no txbuf so we're certain not to be able to send anything */
4057 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02004058
Olivier Houchardf502aca2018-12-14 19:42:40 +01004059 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02004060 h2c = h2s->h2c;
4061 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02004062 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01004063 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
4064 !h2_frt_has_too_many_cs(h2c)) {
4065 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02004066 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004067 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02004068 }
Willy Tarreau60935142017-10-16 18:11:19 +02004069
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004070 /* this stream may be blocked waiting for some data to leave (possibly
4071 * an ES or RST frame), so orphan it in this case.
4072 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02004073 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02004074 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01004075 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01004076 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004077 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004078 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02004079 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01004080
Willy Tarreau45f752e2017-10-30 15:44:59 +01004081 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
4082 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
4083 /* unblock the connection if it was blocked on this
4084 * stream.
4085 */
4086 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
4087 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02004088 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01004089 }
4090
Willy Tarreau71049cc2018-03-28 13:56:39 +02004091 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02004092
Christopher Faulet9b79a102019-07-15 11:22:56 +02004093 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01004094 if (!(h2c->conn->flags &
4095 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004096 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02004097 /* Add the connection in the session server list, if not already done */
4098 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
4099 h2c->conn->owner = NULL;
4100 if (eb_is_empty(&h2c->streams_by_id)) {
4101 h2c->conn->mux->destroy(h2c);
4102 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4103 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02004104 }
4105 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02004106 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004107 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
4108 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
4109 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01004110 return;
4111 }
4112 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004113 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004114 else {
4115 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004116 /* If the connection is owned by the session, first remove it
4117 * from its list
4118 */
4119 if (h2c->conn->owner) {
4120 session_unown_conn(h2c->conn->owner, h2c->conn);
4121 h2c->conn->owner = NULL;
4122 }
4123
Olivier Houcharddc2f2752020-02-13 19:12:07 +01004124 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01004125 /* The server doesn't want it, let's kill the connection right away */
4126 h2c->conn->mux->destroy(h2c);
4127 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
4128 return;
4129 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01004130 /* At this point, the connection has been added to the
4131 * server idle list, so another thread may already have
4132 * hijacked it, so we can't do anything with it.
4133 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01004134 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
4135 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01004136
Olivier Houchard8a786902018-12-15 16:05:40 +01004137 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004138 else if (MT_LIST_ISEMPTY(&h2c->conn->list) &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004139 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
4140 !LIST_ADDED(&h2c->conn->session_list)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004141 LIST_ADD(&__objt_server(h2c->conn->target)->available_conns[tid], mt_list_to_list(&h2c->conn->list));
4142 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004143 }
4144 }
4145 }
4146
Willy Tarreaue323f342018-03-28 13:51:45 +02004147 /* We don't want to close right now unless we're removing the
4148 * last stream, and either the connection is in error, or it
4149 * reached the ID already specified in a GOAWAY frame received
4150 * or sent (as seen by last_sid >= 0).
4151 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004152 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004153 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004154 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004155 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004156 }
4157 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004158 if (h2c_may_expire(h2c))
4159 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4160 else
4161 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004162 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004163 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004164 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004165 else
4166 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004167}
4168
Willy Tarreau88bdba32019-05-13 18:17:53 +02004169/* Performs a synchronous or asynchronous shutr(). */
4170static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004171{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004172 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004173
Willy Tarreauf983d002019-05-14 10:40:21 +02004174 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004175 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004176
Willy Tarreau7838a792019-08-12 18:42:03 +02004177 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4178
Willy Tarreau18059042019-01-31 19:12:48 +01004179 /* a connstream may require us to immediately kill the whole connection
4180 * for example because of a "tcp-request content reject" rule that is
4181 * normally used to limit abuse. In this case we schedule a goaway to
4182 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004183 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004184 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004185 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004186 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004187 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4188 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4189 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004190 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4191 /* Nothing was never sent for this stream, so reset with
4192 * REFUSED_STREAM error to let the client retry the
4193 * request.
4194 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004195 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004196 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4197 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004198 else {
4199 /* a final response was already provided, we don't want this
4200 * stream anymore. This may happen when the server responds
4201 * before the end of an upload and closes quickly (redirect,
4202 * deny, ...)
4203 */
4204 h2s_error(h2s, H2_ERR_CANCEL);
4205 }
Willy Tarreau18059042019-01-31 19:12:48 +01004206
Willy Tarreau90c32322017-11-24 08:00:30 +01004207 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004208 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004209 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004210
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004211 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004212 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004213 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004214 done:
4215 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004216 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004217 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004218add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004219 /* Let the handler know we want to shutr, and add ourselves to the
4220 * most relevant list if not yet done. h2_deferred_shut() will be
4221 * automatically called via the shut_tl tasklet when there's room
4222 * again.
4223 */
4224 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004225 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004226 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004227 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004228 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004229 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004230 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004231 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004232 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004233}
4234
Willy Tarreau88bdba32019-05-13 18:17:53 +02004235/* Performs a synchronous or asynchronous shutw(). */
4236static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004237{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004238 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004239
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004240 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004241 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004242
Willy Tarreau7838a792019-08-12 18:42:03 +02004243 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4244
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004245 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004246 /* we can cleanly close using an empty data frame only after headers */
4247
4248 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4249 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004250 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004251
4252 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004253 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004254 else
4255 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004256 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004257 /* a connstream may require us to immediately kill the whole connection
4258 * for example because of a "tcp-request content reject" rule that is
4259 * normally used to limit abuse. In this case we schedule a goaway to
4260 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004261 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004262 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004263 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004264 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004265 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4266 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4267 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004268 else {
4269 /* Nothing was never sent for this stream, so reset with
4270 * REFUSED_STREAM error to let the client retry the
4271 * request.
4272 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004273 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004274 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4275 }
Willy Tarreau18059042019-01-31 19:12:48 +01004276
Willy Tarreau90c32322017-11-24 08:00:30 +01004277 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004278 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004279 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004280
Willy Tarreau00dd0782018-03-01 16:31:34 +01004281 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004282 }
4283
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004284 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004285 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004286
4287 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4288
Willy Tarreau88bdba32019-05-13 18:17:53 +02004289 done:
4290 h2s->flags &= ~H2_SF_WANT_SHUTW;
4291 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004292
4293 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004294 /* Let the handler know we want to shutw, and add ourselves to the
4295 * most relevant list if not yet done. h2_deferred_shut() will be
4296 * automatically called via the shut_tl tasklet when there's room
4297 * again.
4298 */
4299 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004300 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004301 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004302 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004303 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004304 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004305 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004306 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004307 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004308}
4309
Willy Tarreau5723f292020-01-10 15:16:57 +01004310/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004311 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4312 * and prevented the last frame from being emitted.
4313 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004314static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
4315{
4316 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004317 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004318
Willy Tarreau7838a792019-08-12 18:42:03 +02004319 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4320
Willy Tarreau5723f292020-01-10 15:16:57 +01004321 if (h2s->flags & H2_SF_NOTIFIED) {
4322 /* some data processing remains to be done first */
4323 goto end;
4324 }
4325
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004326 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004327 h2_do_shutw(h2s);
4328
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004329 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004330 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004331
Willy Tarreau88bdba32019-05-13 18:17:53 +02004332 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004333 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004334 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004335
Willy Tarreau88bdba32019-05-13 18:17:53 +02004336 if (!h2s->cs) {
4337 h2s_destroy(h2s);
4338 if (h2c_is_dead(h2c))
4339 h2_release(h2c);
4340 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004341 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004342 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004343 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004344 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004345}
4346
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004347/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004348static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4349{
4350 struct h2s *h2s = cs->ctx;
4351
Willy Tarreau7838a792019-08-12 18:42:03 +02004352 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004353 if (cs->flags & CS_FL_KILL_CONN)
4354 h2s->flags |= H2_SF_KILL_CONN;
4355
Willy Tarreau7838a792019-08-12 18:42:03 +02004356 if (mode)
4357 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004358
Willy Tarreau7838a792019-08-12 18:42:03 +02004359 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004360}
4361
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004362/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004363static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4364{
4365 struct h2s *h2s = cs->ctx;
4366
Willy Tarreau7838a792019-08-12 18:42:03 +02004367 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004368 if (cs->flags & CS_FL_KILL_CONN)
4369 h2s->flags |= H2_SF_KILL_CONN;
4370
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004371 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004372 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004373}
4374
Christopher Faulet9b79a102019-07-15 11:22:56 +02004375/* Decode the payload of a HEADERS frame and produce the HTX request or response
4376 * depending on the connection's side. Returns a positive value on success, a
4377 * negative value on failure, or 0 if it couldn't proceed. May report connection
4378 * errors in h2c->errcode if the frame is non-decodable and the connection
4379 * unrecoverable. In absence of connection error when a failure is reported, the
4380 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004381 *
4382 * The function may fold CONTINUATION frames into the initial HEADERS frame
4383 * by removing padding and next frame header, then moving the CONTINUATION
4384 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4385 * leaving a hole between the main frame and the beginning of the next one.
4386 * The possibly remaining incomplete or next frame at the end may be moved
4387 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4388 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4389 *
4390 * A buffer at the beginning of processing may look like this :
4391 *
4392 * ,---.---------.-----.--------------.--------------.------.---.
4393 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4394 * `---^---------^-----^--------------^--------------^------^---'
4395 * | | <-----> | |
4396 * area | dpl | wrap
4397 * |<--------------> |
4398 * | dfl |
4399 * |<-------------------------------------------------->|
4400 * head data
4401 *
4402 * Padding is automatically overwritten when folding, participating to the
4403 * hole size after dfl :
4404 *
4405 * ,---.------------------------.-----.--------------.------.---.
4406 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4407 * `---^------------------------^-----^--------------^------^---'
4408 * | | <-----> | |
4409 * area | hole | wrap
4410 * |<-----------------------> |
4411 * | dfl |
4412 * |<-------------------------------------------------->|
4413 * head data
4414 *
4415 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4416 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4417 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004418 *
4419 * The <flags> field must point to either the stream's flags or to a copy of it
4420 * so that the function can update the following flags :
4421 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004422 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004423 *
4424 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4425 * decoding, in order to detect if we're dealing with a headers or a trailers
4426 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004427 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01004428static 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 +02004429{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004430 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004431 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004432 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004433 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004434 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004435 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004436 int flen; // header frame len
4437 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004438 int ret = 0;
4439 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004440 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004441
Willy Tarreau7838a792019-08-12 18:42:03 +02004442 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4443
Willy Tarreauea18f862018-12-22 20:19:26 +01004444next_frame:
4445 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4446 goto leave; // incomplete input frame
4447
4448 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4449 * this case, we'll try to paste it immediately after the initial
4450 * HEADERS frame payload and kill any possible padding. The initial
4451 * frame's length will be increased to represent the concatenation
4452 * of the two frames. The next frame is read from position <tlen>
4453 * and written at position <flen> (minus padding if some is present).
4454 */
4455 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4456 struct h2_fh hdr;
4457 int clen; // CONTINUATION frame's payload length
4458
Willy Tarreau7838a792019-08-12 18:42:03 +02004459 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 +01004460 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4461 /* no more data, the buffer may be full, either due to
4462 * too large a frame or because of too large a hole that
4463 * we're going to compact at the end.
4464 */
4465 goto leave;
4466 }
4467
4468 if (hdr.ft != H2_FT_CONTINUATION) {
4469 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004470 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 +01004471 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01004472 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004473 goto fail;
4474 }
4475
4476 if (hdr.sid != h2c->dsi) {
4477 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004478 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 +01004479 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01004480 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreauea18f862018-12-22 20:19:26 +01004481 goto fail;
4482 }
4483
4484 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4485 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004486 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 +01004487 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4488 goto fail;
4489 }
4490
4491 /* detect when we must stop aggragating frames */
4492 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4493
4494 /* Take as much as we can of the CONTINUATION frame's payload */
4495 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4496 if (clen > hdr.len)
4497 clen = hdr.len;
4498
4499 /* Move the frame's payload over the padding, hole and frame
4500 * header. At least one of hole or dpl is null (see diagrams
4501 * above). The hole moves after the new aggragated frame.
4502 */
4503 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4504 h2c->dfl += clen - h2c->dpl;
4505 hole += h2c->dpl + 9;
4506 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004507 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 +01004508 goto next_frame;
4509 }
4510
4511 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004512
Willy Tarreau13278b42017-10-13 19:23:14 +02004513 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004514 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004515 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004516 copy = alloc_trash_chunk();
4517 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004518 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 +02004519 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4520 goto fail;
4521 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004522 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4523 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4524 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004525 }
4526
Willy Tarreau13278b42017-10-13 19:23:14 +02004527 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4528 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004529 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004530 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004531 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 +01004532 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01004533 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004534 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004535 }
4536
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004537 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004538 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 +01004539 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4540 goto fail;
4541 }
4542
Willy Tarreau13278b42017-10-13 19:23:14 +02004543 hdrs += 5; // stream dep = 4, weight = 1
4544 flen -= 5;
4545 }
4546
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004547 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004548 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 +01004549 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004550 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004551 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004552
Willy Tarreau937f7602018-02-26 15:22:17 +01004553 /* we can't retry a failed decompression operation so we must be very
4554 * careful not to take any risks. In practice the output buffer is
4555 * always empty except maybe for trailers, in which case we simply have
4556 * to wait for the upper layer to finish consuming what is available.
4557 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004558 htx = htx_from_buf(rxbuf);
4559 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004560 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 +02004561 h2c->flags |= H2_CF_DEM_SFULL;
4562 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004563 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004564
Willy Tarreau25919232019-01-03 14:48:18 +01004565 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004566 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4567 sizeof(list)/sizeof(list[0]), tmp);
4568 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004569 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 +01004570 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4571 goto fail;
4572 }
4573
Willy Tarreau25919232019-01-03 14:48:18 +01004574 /* The PACK decompressor was updated, let's update the input buffer and
4575 * the parser's state to commit these changes and allow us to later
4576 * fail solely on the stream if needed.
4577 */
4578 b_del(&h2c->dbuf, h2c->dfl + hole);
4579 h2c->dfl = hole = 0;
4580 h2c->st0 = H2_CS_FRAME_H;
4581
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004582 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004583 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004584
Willy Tarreau88d138e2019-01-02 19:38:14 +01004585 if (*flags & H2_SF_HEADERS_RCVD)
4586 goto trailers;
4587
4588 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004589 if (h2c->flags & H2_CF_IS_BACK)
4590 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
4591 else
4592 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004593
4594 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004595 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004596 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 +01004597 goto fail;
4598 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004599
Willy Tarreau174b06a2018-04-25 18:13:58 +02004600 if (msgf & H2_MSGF_BODY) {
4601 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004602 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004603 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004604 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004605 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004606 }
4607
Willy Tarreau88d138e2019-01-02 19:38:14 +01004608 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004609 /* indicate that a HEADERS frame was received for this stream, except
4610 * for 1xx responses. For 1xx responses, another HEADERS frame is
4611 * expected.
4612 */
4613 if (!(msgf & H2_MSGF_RSP_1XX))
4614 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004615
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02004616 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004617 /* Mark the end of message using EOM */
Christopher Faulet810df062020-07-22 16:20:34 +02004618 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004619 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
4620 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 +02004621 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004622 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004623 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004624
Willy Tarreau86277d42019-01-02 15:36:11 +01004625 /* success */
4626 ret = 1;
4627
Willy Tarreau68dd9852017-07-03 14:44:26 +02004628 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004629 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004630 * move the remaining data over it.
4631 */
4632 if (hole) {
4633 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4634 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4635 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4636 b_sub(&h2c->dbuf, hole);
4637 }
4638
Willy Tarreau97215ca2019-04-29 10:20:21 +02004639 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004640 /* too large frames */
4641 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004642 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004643 }
4644
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004645 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004646 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004647 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004648 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004649 return ret;
4650
Willy Tarreau68dd9852017-07-03 14:44:26 +02004651 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004652 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004653 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004654
4655 trailers:
4656 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004657 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4658 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004659 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 +01004660 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Amaury Denoyellea8879232020-10-27 17:16:03 +01004661 HA_ATOMIC_ADD(&h2c->px_counters->strm_proto_err, 1);
Willy Tarreau88d138e2019-01-02 19:38:14 +01004662 goto fail;
4663 }
4664
Christopher Faulet9b79a102019-07-15 11:22:56 +02004665 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004666 if (h2_make_htx_trailers(list, htx) <= 0) {
4667 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 +02004668 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004669 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004670 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004671}
4672
Christopher Faulet9b79a102019-07-15 11:22:56 +02004673/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004674 * parser state is automatically updated. Returns > 0 if it could completely
4675 * send the current frame, 0 if it couldn't complete, in which case
4676 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4677 * DATA frame can return 0 as a valid result). Stream errors are reported in
4678 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4679 * have checked the frame header and ensured that the frame was complete or the
4680 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004681 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004682static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004683{
4684 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004685 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004686 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004687 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004688 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004689 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004690
Willy Tarreau7838a792019-08-12 18:42:03 +02004691 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4692
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004693 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004694
Olivier Houchard638b7992018-08-16 15:41:52 +02004695 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004696 if (!csbuf) {
4697 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004698 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 +01004699 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004700 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004701 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004702
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004703try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004704 flen = h2c->dfl - h2c->dpl;
4705 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004706 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004707
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004708 if (flen > b_data(&h2c->dbuf)) {
4709 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004710 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004711 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004712 }
4713
Christopher Faulet9b79a102019-07-15 11:22:56 +02004714 block = htx_free_data_space(htx);
4715 if (!block) {
4716 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004717 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 +02004718 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004719 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004720 if (flen > block)
4721 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004722
Christopher Faulet9b79a102019-07-15 11:22:56 +02004723 /* here, flen is the max we can copy into the output buffer */
4724 block = b_contig_data(&h2c->dbuf, 0);
4725 if (flen > block)
4726 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004727
Christopher Faulet9b79a102019-07-15 11:22:56 +02004728 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004729 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 +02004730
Christopher Faulet9b79a102019-07-15 11:22:56 +02004731 b_del(&h2c->dbuf, sent);
4732 h2c->dfl -= sent;
4733 h2c->rcvd_c += sent;
4734 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004735
Christopher Faulet9b79a102019-07-15 11:22:56 +02004736 if (h2s->flags & H2_SF_DATA_CLEN) {
4737 h2s->body_len -= sent;
4738 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004739 }
4740
Christopher Faulet9b79a102019-07-15 11:22:56 +02004741 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004742 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004743 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 +01004744 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004745 }
4746
Christopher Faulet9b79a102019-07-15 11:22:56 +02004747 goto try_again;
4748
Willy Tarreau4a28da12018-01-04 14:41:00 +01004749 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004750 /* here we're done with the frame, all the payload (except padding) was
4751 * transferred.
4752 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004753
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004754 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Faulet810df062020-07-22 16:20:34 +02004755 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004756 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004757 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 +02004758 h2c->flags |= H2_CF_DEM_SFULL;
4759 goto fail;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004760 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004761 }
4762
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004763 h2c->rcvd_c += h2c->dpl;
4764 h2c->rcvd_s += h2c->dpl;
4765 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004766 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004767 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004768 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004769 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004770 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004771 if (htx)
4772 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004773 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004774 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004775}
4776
Willy Tarreau115e83b2018-12-01 19:17:53 +01004777/* Try to send a HEADERS frame matching HTX response present in HTX message
4778 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4779 * must check the stream's status to detect any error which might have happened
4780 * subsequently to a successful send. The htx blocks are automatically removed
4781 * from the message. The htx message is assumed to be valid since produced from
4782 * the internal code, hence it contains a start line, an optional series of
4783 * header blocks and an end of header, otherwise an invalid frame could be
4784 * emitted and the resulting htx message could be left in an inconsistent state.
4785 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004786static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004787{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004788 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004789 struct h2c *h2c = h2s->h2c;
4790 struct htx_blk *blk;
4791 struct htx_blk *blk_end;
4792 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004793 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004794 struct htx_sl *sl;
4795 enum htx_blk_type type;
4796 int es_now = 0;
4797 int ret = 0;
4798 int hdr;
4799 int idx;
4800
Willy Tarreau7838a792019-08-12 18:42:03 +02004801 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4802
Willy Tarreau115e83b2018-12-01 19:17:53 +01004803 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004804 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004805 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004806 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004807 return 0;
4808 }
4809
Willy Tarreau115e83b2018-12-01 19:17:53 +01004810 /* determine the first block which must not be deleted, blk_end may
4811 * be NULL if all blocks have to be deleted.
4812 */
4813 idx = htx_get_head(htx);
4814 blk_end = NULL;
4815 while (idx != -1) {
4816 type = htx_get_blk_type(htx_get_blk(htx, idx));
4817 idx = htx_get_next(htx, idx);
4818 if (type == HTX_BLK_EOH) {
4819 if (idx != -1)
4820 blk_end = htx_get_blk(htx, idx);
4821 break;
4822 }
4823 }
4824
4825 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004826 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004827 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_RES_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004828 ALREADY_CHECKED(blk);
4829 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004830 h2s->status = sl->info.res.status;
Willy Tarreau7838a792019-08-12 18:42:03 +02004831 if (h2s->status < 100 || h2s->status > 999) {
4832 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 +01004833 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004834 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004835
4836 /* and the rest of the headers, that we dump starting at header 0 */
4837 hdr = 0;
4838
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004839 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004840 while ((idx = htx_get_next(htx, idx)) != -1) {
4841 blk = htx_get_blk(htx, idx);
4842 type = htx_get_blk_type(blk);
4843
4844 if (type == HTX_BLK_UNUSED)
4845 continue;
4846
4847 if (type != HTX_BLK_HDR)
4848 break;
4849
Willy Tarreau7838a792019-08-12 18:42:03 +02004850 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4851 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 +01004852 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004853 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004854
4855 list[hdr].n = htx_get_blk_name(htx, blk);
4856 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004857 hdr++;
4858 }
4859
4860 /* marker for end of headers */
4861 list[hdr].n = ist("");
4862
4863 if (h2s->status == 204 || h2s->status == 304) {
4864 /* no contents, claim c-len is present and set to zero */
4865 es_now = 1;
4866 }
4867
Willy Tarreau9c218e72019-05-26 10:08:28 +02004868 mbuf = br_tail(h2c->mbuf);
4869 retry:
4870 if (!h2_get_buf(h2c, mbuf)) {
4871 h2c->flags |= H2_CF_MUX_MALLOC;
4872 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004873 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 +02004874 return 0;
4875 }
4876
Willy Tarreau115e83b2018-12-01 19:17:53 +01004877 chunk_reset(&outbuf);
4878
4879 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004880 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4881 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004882 break;
4883 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004884 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004885 }
4886
4887 if (outbuf.size < 9)
4888 goto full;
4889
4890 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4891 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4892 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4893 outbuf.data = 9;
4894
4895 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004896 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004897 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004898 goto realign_again;
4899 goto full;
4900 }
4901
4902 /* encode all headers, stop at empty name */
4903 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4904 /* these ones do not exist in H2 and must be dropped. */
4905 if (isteq(list[hdr].n, ist("connection")) ||
4906 isteq(list[hdr].n, ist("proxy-connection")) ||
4907 isteq(list[hdr].n, ist("keep-alive")) ||
4908 isteq(list[hdr].n, ist("upgrade")) ||
4909 isteq(list[hdr].n, ist("transfer-encoding")))
4910 continue;
4911
Christopher Faulet86d144c2019-08-14 16:32:25 +02004912 /* Skip all pseudo-headers */
4913 if (*(list[hdr].n.ptr) == ':')
4914 continue;
4915
Willy Tarreau115e83b2018-12-01 19:17:53 +01004916 if (isteq(list[hdr].n, ist("")))
4917 break; // end
4918
4919 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4920 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004921 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004922 goto realign_again;
4923 goto full;
4924 }
4925 }
4926
Willy Tarreaucb985a42019-10-07 16:56:34 +02004927 /* update the frame's size */
4928 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4929
4930 if (outbuf.data > h2c->mfs + 9) {
4931 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
4932 /* output full */
4933 if (b_space_wraps(mbuf))
4934 goto realign_again;
4935 goto full;
4936 }
4937 }
4938
Christopher Faulet0b465482019-02-19 15:14:23 +01004939 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004940 * FIXME: we should also set it when we know for sure that the
4941 * content-length is zero as well as on 204/304
4942 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004943 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4944 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004945 es_now = 1;
4946
Willy Tarreau927b88b2019-03-04 08:03:25 +01004947 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004948 es_now = 1;
4949
Willy Tarreau115e83b2018-12-01 19:17:53 +01004950 if (es_now)
4951 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4952
4953 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02004954 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02004955 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004956
4957 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4958 * 1xx responses, another HEADERS frame is expected.
4959 */
4960 if (h2s->status >= 200 || h2s->status == 101)
4961 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004962
Willy Tarreau115e83b2018-12-01 19:17:53 +01004963 if (es_now) {
4964 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02004965 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 +01004966 if (h2s->st == H2_SS_OPEN)
4967 h2s->st = H2_SS_HLOC;
4968 else
4969 h2s_close(h2s);
4970 }
4971
4972 /* OK we could properly deliver the response */
4973
4974 /* remove all header blocks including the EOH and compute the
4975 * corresponding size.
4976 *
4977 * FIXME: We should remove everything when es_now is set.
4978 */
4979 ret = 0;
4980 idx = htx_get_head(htx);
4981 blk = htx_get_blk(htx, idx);
4982 while (blk != blk_end) {
4983 ret += htx_get_blksz(blk);
4984 blk = htx_remove_blk(htx, blk);
4985 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004986
Christopher Faulet316934d2019-05-15 14:22:48 +02004987 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4988 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004989 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004990 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004991 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004992 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004993 return ret;
4994 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004995 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4996 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004997 h2c->flags |= H2_CF_MUX_MFULL;
4998 h2s->flags |= H2_SF_BLK_MROOM;
4999 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005000 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 +01005001 goto end;
5002 fail:
5003 /* unparsable HTX messages, too large ones to be produced in the local
5004 * list etc go here (unrecoverable errors).
5005 */
5006 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5007 ret = 0;
5008 goto end;
5009}
5010
Willy Tarreau80739692018-10-05 11:35:57 +02005011/* Try to send a HEADERS frame matching HTX request present in HTX message
5012 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
5013 * must check the stream's status to detect any error which might have happened
5014 * subsequently to a successful send. The htx blocks are automatically removed
5015 * from the message. The htx message is assumed to be valid since produced from
5016 * the internal code, hence it contains a start line, an optional series of
5017 * header blocks and an end of header, otherwise an invalid frame could be
5018 * emitted and the resulting htx message could be left in an inconsistent state.
5019 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005020static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02005021{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005022 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02005023 struct h2c *h2c = h2s->h2c;
5024 struct htx_blk *blk;
5025 struct htx_blk *blk_end;
5026 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005027 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02005028 struct htx_sl *sl;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005029 struct ist meth, uri, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02005030 enum htx_blk_type type;
5031 int es_now = 0;
5032 int ret = 0;
5033 int hdr;
5034 int idx;
5035
Willy Tarreau7838a792019-08-12 18:42:03 +02005036 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5037
Willy Tarreau80739692018-10-05 11:35:57 +02005038 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005039 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005040 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005041 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02005042 return 0;
5043 }
5044
Willy Tarreau80739692018-10-05 11:35:57 +02005045 /* determine the first block which must not be deleted, blk_end may
5046 * be NULL if all blocks have to be deleted.
5047 */
5048 idx = htx_get_head(htx);
5049 blk_end = NULL;
5050 while (idx != -1) {
5051 type = htx_get_blk_type(htx_get_blk(htx, idx));
5052 idx = htx_get_next(htx, idx);
5053 if (type == HTX_BLK_EOH) {
5054 if (idx != -1)
5055 blk_end = htx_get_blk(htx, idx);
5056 break;
5057 }
5058 }
5059
5060 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02005061 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01005062 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02005063 ALREADY_CHECKED(blk);
5064 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02005065 meth = htx_sl_req_meth(sl);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005066 uri = htx_sl_req_uri(sl);
5067 if (unlikely(uri.len == 0)) {
5068 TRACE_PROTO("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
5069 goto fail;
5070 }
Willy Tarreau80739692018-10-05 11:35:57 +02005071
5072 /* and the rest of the headers, that we dump starting at header 0 */
5073 hdr = 0;
5074
Willy Tarreau8e162ee2018-12-06 14:07:27 +01005075 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02005076 while ((idx = htx_get_next(htx, idx)) != -1) {
5077 blk = htx_get_blk(htx, idx);
5078 type = htx_get_blk_type(blk);
5079
5080 if (type == HTX_BLK_UNUSED)
5081 continue;
5082
5083 if (type != HTX_BLK_HDR)
5084 break;
5085
Willy Tarreau7838a792019-08-12 18:42:03 +02005086 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5087 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 +02005088 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005089 }
Willy Tarreau80739692018-10-05 11:35:57 +02005090
5091 list[hdr].n = htx_get_blk_name(htx, blk);
5092 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02005093
5094 /* Skip header if same name is used to add the server name */
5095 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
5096 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
5097 continue;
5098
Willy Tarreau80739692018-10-05 11:35:57 +02005099 hdr++;
5100 }
5101
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02005102 /* Now add the server name to a header (if requested) */
5103 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
5104 struct server *srv = objt_server(h2c->conn->target);
5105
5106 if (srv) {
5107 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
5108 list[hdr].v = ist(srv->id);
5109 hdr++;
5110 }
5111 }
5112
Willy Tarreau80739692018-10-05 11:35:57 +02005113 /* marker for end of headers */
5114 list[hdr].n = ist("");
5115
Willy Tarreau9c218e72019-05-26 10:08:28 +02005116 mbuf = br_tail(h2c->mbuf);
5117 retry:
5118 if (!h2_get_buf(h2c, mbuf)) {
5119 h2c->flags |= H2_CF_MUX_MALLOC;
5120 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005121 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 +02005122 return 0;
5123 }
5124
Willy Tarreau80739692018-10-05 11:35:57 +02005125 chunk_reset(&outbuf);
5126
5127 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005128 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5129 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005130 break;
5131 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005132 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02005133 }
5134
5135 if (outbuf.size < 9)
5136 goto full;
5137
5138 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
5139 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
5140 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5141 outbuf.data = 9;
5142
5143 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005144 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005145 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005146 goto realign_again;
5147 goto full;
5148 }
5149
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005150 auth = ist(NULL);
5151
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005152 /* RFC7540 #8.3: the CONNECT method must have :
5153 * - :authority set to the URI part (host:port)
5154 * - :method set to CONNECT
5155 * - :scheme and :path omitted
5156 */
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005157 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT)) {
5158 auth = uri;
5159
5160 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5161 /* output full */
5162 if (b_space_wraps(mbuf))
5163 goto realign_again;
5164 goto full;
5165 }
5166 } else {
5167 /* other methods need a :scheme. If an authority is known from
5168 * the request line, it must be sent, otherwise only host is
5169 * sent. Host is never sent as the authority.
5170 */
5171 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005172
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005173 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5174 /* the URI seems to start with a scheme */
5175 int len = 1;
5176
5177 while (len < uri.len && uri.ptr[len] != ':')
5178 len++;
5179
5180 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5181 /* make the uri start at the authority now */
5182 scheme.ptr = uri.ptr;
5183 scheme.len = len,
5184 uri.ptr += len + 3;
5185 uri.len -= len + 3;
5186
5187 /* find the auth part of the URI */
5188 auth.ptr = uri.ptr;
5189 auth.len = 0;
5190 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5191 auth.len++;
5192
5193 uri.ptr += auth.len;
5194 uri.len -= auth.len;
5195 }
5196 }
5197
5198 if (!scheme.len) {
5199 /* no explicit scheme, we're using an origin-form URI,
5200 * probably from an H1 request transcoded to H2 via an
5201 * external layer, then received as H2 without authority.
5202 * So we have to look up the scheme from the HTX flags.
5203 * In such a case only http and https are possible, and
5204 * https is the default (sent by browsers).
5205 */
5206 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5207 scheme = ist("http");
5208 else
5209 scheme = ist("https");
5210 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005211
5212 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005213 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005214 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005215 goto realign_again;
5216 goto full;
5217 }
Willy Tarreau80739692018-10-05 11:35:57 +02005218
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005219 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005220 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005221 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005222 goto realign_again;
5223 goto full;
5224 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005225
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005226 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5227 * be sent as '/' or '*'.
5228 */
5229 if (unlikely(!uri.len)) {
5230 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5231 uri = ist("*");
5232 else
5233 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005234 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005235
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005236 if (!hpack_encode_path(&outbuf, uri)) {
5237 /* output full */
5238 if (b_space_wraps(mbuf))
5239 goto realign_again;
5240 goto full;
5241 }
Willy Tarreau80739692018-10-05 11:35:57 +02005242 }
5243
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005244 /* encode all headers, stop at empty name. Host is only sent if we
5245 * do not provide an authority.
5246 */
Willy Tarreau80739692018-10-05 11:35:57 +02005247 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005248 struct ist n = list[hdr].n;
5249 struct ist v = list[hdr].v;
5250
Willy Tarreau80739692018-10-05 11:35:57 +02005251 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005252 if (isteq(n, ist("connection")) ||
5253 (auth.len && isteq(n, ist("host"))) ||
5254 isteq(n, ist("proxy-connection")) ||
5255 isteq(n, ist("keep-alive")) ||
5256 isteq(n, ist("upgrade")) ||
5257 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005258 continue;
5259
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005260 if (isteq(n, ist("te"))) {
5261 /* "te" may only be sent with "trailers" if this value
5262 * is present, otherwise it must be deleted.
5263 */
5264 v = istist(v, ist("trailers"));
5265 if (!v.ptr || (v.len > 8 && v.ptr[8] != ','))
5266 continue;
5267 v = ist("trailers");
5268 }
5269
Christopher Faulet86d144c2019-08-14 16:32:25 +02005270 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005271 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005272 continue;
5273
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005274 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005275 break; // end
5276
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005277 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005278 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005279 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005280 goto realign_again;
5281 goto full;
5282 }
5283 }
5284
Willy Tarreaucb985a42019-10-07 16:56:34 +02005285 /* update the frame's size */
5286 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5287
5288 if (outbuf.data > h2c->mfs + 9) {
5289 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5290 /* output full */
5291 if (b_space_wraps(mbuf))
5292 goto realign_again;
5293 goto full;
5294 }
5295 }
5296
Willy Tarreau80739692018-10-05 11:35:57 +02005297 /* we may need to add END_STREAM if we have no body :
5298 * - request already closed, or :
5299 * - no transfer-encoding, and :
5300 * - no content-length or content-length:0
5301 * Fixme: this doesn't take into account CONNECT requests.
5302 */
5303 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
5304 es_now = 1;
5305
5306 if (sl->flags & HTX_SL_F_BODYLESS)
5307 es_now = 1;
5308
Willy Tarreau927b88b2019-03-04 08:03:25 +01005309 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02005310 es_now = 1;
5311
Willy Tarreau80739692018-10-05 11:35:57 +02005312 if (es_now)
5313 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5314
5315 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005316 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005317 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005318 h2s->flags |= H2_SF_HEADERS_SENT;
5319 h2s->st = H2_SS_OPEN;
5320
Willy Tarreau80739692018-10-05 11:35:57 +02005321 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005322 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 +02005323 // trim any possibly pending data (eg: inconsistent content-length)
5324 h2s->flags |= H2_SF_ES_SENT;
5325 h2s->st = H2_SS_HLOC;
5326 }
5327
5328 /* remove all header blocks including the EOH and compute the
5329 * corresponding size.
5330 *
5331 * FIXME: We should remove everything when es_now is set.
5332 */
5333 ret = 0;
5334 idx = htx_get_head(htx);
5335 blk = htx_get_blk(htx, idx);
5336 while (blk != blk_end) {
5337 ret += htx_get_blksz(blk);
5338 blk = htx_remove_blk(htx, blk);
5339 }
5340
Christopher Faulet316934d2019-05-15 14:22:48 +02005341 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5342 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02005343 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02005344 }
Willy Tarreau80739692018-10-05 11:35:57 +02005345
5346 end:
5347 return ret;
5348 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005349 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5350 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005351 h2c->flags |= H2_CF_MUX_MFULL;
5352 h2s->flags |= H2_SF_BLK_MROOM;
5353 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005354 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 +02005355 goto end;
5356 fail:
5357 /* unparsable HTX messages, too large ones to be produced in the local
5358 * list etc go here (unrecoverable errors).
5359 */
5360 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5361 ret = 0;
5362 goto end;
5363}
5364
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005365/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005366 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5367 * caller must check the stream's status to detect any error which might have
5368 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02005369 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005370 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005371static size_t h2s_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005372{
5373 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005374 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005375 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005376 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005377 size_t total = 0;
5378 int es_now = 0;
5379 int bsize; /* htx block size */
5380 int fsize; /* h2 frame size */
5381 struct htx_blk *blk;
5382 enum htx_blk_type type;
5383 int idx;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005384 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005385
Willy Tarreau7838a792019-08-12 18:42:03 +02005386 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5387
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005388 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005389 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005390 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005391 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005392 goto end;
5393 }
5394
Willy Tarreau98de12a2018-12-12 07:03:00 +01005395 htx = htx_from_buf(buf);
5396
Christopher Faulet54b5e212019-06-04 10:08:28 +02005397 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
5398 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
5399 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005400 */
5401
5402 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005403 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005404 goto end;
5405
5406 idx = htx_get_head(htx);
5407 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02005408 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005409 bsize = htx_get_blksz(blk);
5410 fsize = bsize;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005411 trunc_out = 0;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005412
Christopher Faulet54b5e212019-06-04 10:08:28 +02005413 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01005414 if (h2s->flags & H2_SF_ES_SENT) {
5415 /* ES already sent */
5416 htx_remove_blk(htx, blk);
5417 total++; // EOM counts as one byte
5418 count--;
5419 goto end;
5420 }
5421 }
5422 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005423 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005424
Willy Tarreau9c218e72019-05-26 10:08:28 +02005425 mbuf = br_tail(h2c->mbuf);
5426 retry:
5427 if (!h2_get_buf(h2c, mbuf)) {
5428 h2c->flags |= H2_CF_MUX_MALLOC;
5429 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005430 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 +02005431 goto end;
5432 }
5433
Willy Tarreau98de12a2018-12-12 07:03:00 +01005434 /* Perform some optimizations to reduce the number of buffer copies.
5435 * First, if the mux's buffer is empty and the htx area contains
5436 * exactly one data block of the same size as the requested count, and
5437 * this count fits within the frame size, the stream's window size, and
5438 * the connection's window size, then it's possible to simply swap the
5439 * caller's buffer with the mux's output buffer and adjust offsets and
5440 * length to match the entire DATA HTX block in the middle. In this
5441 * case we perform a true zero-copy operation from end-to-end. This is
5442 * the situation that happens all the time with large files. Second, if
5443 * this is not possible, but the mux's output buffer is empty, we still
5444 * have an opportunity to avoid the copy to the intermediary buffer, by
5445 * making the intermediary buffer's area point to the output buffer's
5446 * area. In this case we want to skip the HTX header to make sure that
5447 * copies remain aligned and that this operation remains possible all
5448 * the time. This goes for headers, data blocks and any data extracted
5449 * from the HTX blocks.
5450 */
5451 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005452 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005453 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005454 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005455
Willy Tarreaubcc45952019-05-26 10:05:50 +02005456 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005457 /* Too bad there are data left there. We're willing to memcpy/memmove
5458 * up to 1/4 of the buffer, which means that it's OK to copy a large
5459 * frame into a buffer containing few data if it needs to be realigned,
5460 * and that it's also OK to copy few data without realigning. Otherwise
5461 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005462 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005463 if (fsize + 9 <= b_room(mbuf) &&
5464 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005465 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5466 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 +01005467 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005468 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005469
Willy Tarreau9c218e72019-05-26 10:08:28 +02005470 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5471 goto retry;
5472
Willy Tarreau98de12a2018-12-12 07:03:00 +01005473 h2c->flags |= H2_CF_MUX_MFULL;
5474 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005475 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 +01005476 goto end;
5477 }
5478
5479 /* map an H2 frame to the HTX block so that we can put the
5480 * frame header there.
5481 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005482 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5483 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005484
5485 /* prepend an H2 DATA frame header just before the DATA block */
5486 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5487 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5488 h2_set_frame_size(outbuf.area, fsize);
5489
5490 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005491 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005492 h2c->mws -= fsize;
5493
5494 /* and exchange with our old area */
5495 buf->area = old_area;
5496 buf->data = buf->head = 0;
5497 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005498
5499 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 +01005500 goto end;
5501 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005502
Willy Tarreau98de12a2018-12-12 07:03:00 +01005503 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005504 /* for DATA and EOM we'll have to emit a frame, even if empty */
5505
5506 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005507 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5508 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005509 break;
5510 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005511 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005512 }
5513
5514 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005515 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5516 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005517 h2c->flags |= H2_CF_MUX_MFULL;
5518 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005519 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005520 goto end;
5521 }
5522
5523 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5524 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5525 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5526 outbuf.data = 9;
5527
5528 /* we have in <fsize> the exact number of bytes we need to copy from
5529 * the HTX buffer. We need to check this against the connection's and
5530 * the stream's send windows, and to ensure that this fits in the max
5531 * frame size and in the buffer's available space minus 9 bytes (for
5532 * the frame header). The connection's flow control is applied last so
5533 * that we can use a separate list of streams which are immediately
5534 * unblocked on window opening. Note: we don't implement padding.
5535 */
5536
5537 /* EOM is presented with bsize==1 but would lead to the emission of an
5538 * empty frame, thus we force it to zero here.
5539 */
5540 if (type == HTX_BLK_EOM)
5541 bsize = fsize = 0;
5542
5543 if (!fsize)
5544 goto send_empty;
5545
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005546 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005547 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005548 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005549 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005550 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005551 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 +01005552 goto end;
5553 }
5554
Willy Tarreauee573762018-12-04 15:25:57 +01005555 if (fsize > count)
5556 fsize = count;
5557
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005558 if (fsize > h2s_mws(h2s))
5559 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005560
5561 if (h2c->mfs && fsize > h2c->mfs)
5562 fsize = h2c->mfs; // >0
5563
5564 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005565 /* It doesn't fit at once. If it at least fits once split and
5566 * the amount of data to move is low, let's defragment the
5567 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005568 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005569 if (b_space_wraps(mbuf) &&
5570 (fsize + 9 <= b_room(mbuf)) &&
5571 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005572 goto realign_again;
5573 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005574 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005575
5576 if (fsize <= 0) {
5577 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005578 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5579 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005580 h2c->flags |= H2_CF_MUX_MFULL;
5581 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005582 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005583 goto end;
5584 }
5585 }
5586
5587 if (h2c->mws <= 0) {
5588 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005589 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 +01005590 goto end;
5591 }
5592
5593 if (fsize > h2c->mws)
5594 fsize = h2c->mws;
5595
5596 /* now let's copy this this into the output buffer */
5597 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005598 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005599 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005600 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005601
5602 send_empty:
5603 /* update the frame's size */
5604 h2_set_frame_size(outbuf.area, fsize);
5605
5606 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5607 * meeting EOM. We should optimize this later.
5608 */
5609 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005610 total++; // EOM counts as one byte
5611 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005612 es_now = 1;
5613 }
5614
5615 if (es_now)
5616 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5617
5618 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005619 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005620
5621 /* consume incoming HTX block, including EOM */
5622 total += fsize;
5623 if (fsize == bsize) {
5624 htx_remove_blk(htx, blk);
Willy Tarreau7838a792019-08-12 18:42:03 +02005625 if (fsize) {
5626 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 +01005627 goto new_frame;
Willy Tarreau7838a792019-08-12 18:42:03 +02005628 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005629 } else {
5630 /* we've truncated this block */
5631 htx_cut_data_blk(htx, blk, fsize);
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005632 if (trunc_out)
5633 goto new_frame;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005634 }
5635
5636 if (es_now) {
5637 if (h2s->st == H2_SS_OPEN)
5638 h2s->st = H2_SS_HLOC;
5639 else
5640 h2s_close(h2s);
5641
5642 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005643 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 +01005644 }
5645
5646 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005647 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005648 return total;
5649}
5650
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005651/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5652 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5653 * processed. The caller must check the stream's status to detect any error
5654 * which might have happened subsequently to a successful send. The htx blocks
5655 * are automatically removed from the message. The htx message is assumed to be
5656 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005657 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005658 * as a single frame. The ES flag is always set.
5659 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005660static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005661{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005662 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005663 struct h2c *h2c = h2s->h2c;
5664 struct htx_blk *blk;
5665 struct htx_blk *blk_end;
5666 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005667 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005668 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005669 int ret = 0;
5670 int hdr;
5671 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005672
Willy Tarreau7838a792019-08-12 18:42:03 +02005673 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5674
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005675 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005676 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005677 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005678 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005679 goto end;
5680 }
5681
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005682 /* determine the first block which must not be deleted, blk_end may
5683 * be NULL if all blocks have to be deleted. also get trailers.
5684 */
5685 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005686 blk_end = NULL;
5687
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005688 hdr = 0;
5689 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005690 blk = htx_get_blk(htx, idx);
5691 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005692 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005693 if (type == HTX_BLK_UNUSED)
5694 continue;
5695
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005696 if (type == HTX_BLK_EOT) {
5697 if (idx != -1)
5698 blk_end = blk;
5699 break;
5700 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005701 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005702 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005703
Willy Tarreau7838a792019-08-12 18:42:03 +02005704 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5705 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 +01005706 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005707 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005708
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005709 list[hdr].n = htx_get_blk_name(htx, blk);
5710 list[hdr].v = htx_get_blk_value(htx, blk);
5711 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005712 }
5713
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005714 /* marker for end of trailers */
5715 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005716
Willy Tarreau9c218e72019-05-26 10:08:28 +02005717 mbuf = br_tail(h2c->mbuf);
5718 retry:
5719 if (!h2_get_buf(h2c, mbuf)) {
5720 h2c->flags |= H2_CF_MUX_MALLOC;
5721 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005722 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 +02005723 goto end;
5724 }
5725
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005726 chunk_reset(&outbuf);
5727
5728 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005729 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5730 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005731 break;
5732 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005733 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005734 }
5735
5736 if (outbuf.size < 9)
5737 goto full;
5738
5739 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5740 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5741 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5742 outbuf.data = 9;
5743
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005744 /* encode all headers */
5745 for (idx = 0; idx < hdr; idx++) {
5746 /* these ones do not exist in H2 or must not appear in
5747 * trailers and must be dropped.
5748 */
5749 if (isteq(list[idx].n, ist("host")) ||
5750 isteq(list[idx].n, ist("content-length")) ||
5751 isteq(list[idx].n, ist("connection")) ||
5752 isteq(list[idx].n, ist("proxy-connection")) ||
5753 isteq(list[idx].n, ist("keep-alive")) ||
5754 isteq(list[idx].n, ist("upgrade")) ||
5755 isteq(list[idx].n, ist("te")) ||
5756 isteq(list[idx].n, ist("transfer-encoding")))
5757 continue;
5758
Christopher Faulet86d144c2019-08-14 16:32:25 +02005759 /* Skip all pseudo-headers */
5760 if (*(list[idx].n.ptr) == ':')
5761 continue;
5762
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005763 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5764 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005765 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005766 goto realign_again;
5767 goto full;
5768 }
5769 }
5770
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005771 if (outbuf.data == 9) {
5772 /* here we have a problem, we have nothing to emit (either we
5773 * received an empty trailers block followed or we removed its
5774 * contents above). Because of this we can't send a HEADERS
5775 * frame, so we have to cheat and instead send an empty DATA
5776 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005777 */
5778 outbuf.area[3] = H2_FT_DATA;
5779 outbuf.area[4] = H2_F_DATA_END_STREAM;
5780 }
5781
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005782 /* update the frame's size */
5783 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5784
Willy Tarreau572d9f52019-10-11 16:58:37 +02005785 if (outbuf.data > h2c->mfs + 9) {
5786 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5787 /* output full */
5788 if (b_space_wraps(mbuf))
5789 goto realign_again;
5790 goto full;
5791 }
5792 }
5793
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005794 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005795 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 +02005796 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005797 h2s->flags |= H2_SF_ES_SENT;
5798
5799 if (h2s->st == H2_SS_OPEN)
5800 h2s->st = H2_SS_HLOC;
5801 else
5802 h2s_close(h2s);
5803
5804 /* OK we could properly deliver the response */
5805 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005806 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005807 ret = 0;
5808 idx = htx_get_head(htx);
5809 blk = htx_get_blk(htx, idx);
5810 while (blk != blk_end) {
5811 ret += htx_get_blksz(blk);
5812 blk = htx_remove_blk(htx, blk);
5813 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005814
5815 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5816 ret += htx_get_blksz(blk_end);
5817 htx_remove_blk(htx, blk_end);
5818 }
5819
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005820 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005821 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005822 return ret;
5823 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005824 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5825 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005826 h2c->flags |= H2_CF_MUX_MFULL;
5827 h2s->flags |= H2_SF_BLK_MROOM;
5828 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005829 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 +01005830 goto end;
5831 fail:
5832 /* unparsable HTX messages, too large ones to be produced in the local
5833 * list etc go here (unrecoverable errors).
5834 */
5835 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5836 ret = 0;
5837 goto end;
5838}
5839
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005840/* Called from the upper layer, to subscribe <es> to events <event_type>. The
5841 * event subscriber <es> is not allowed to change from a previous call as long
5842 * as at least one event is still subscribed. The <event_type> must only be a
5843 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005844 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005845static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02005846{
Olivier Houchard6ff20392018-07-17 18:46:31 +02005847 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005848 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005849
Willy Tarreau7838a792019-08-12 18:42:03 +02005850 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005851
5852 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005853 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005854
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005855 es->events |= event_type;
5856 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005857
5858 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005859 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005860
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005861 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005862 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02005863 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5864 !LIST_ADDED(&h2s->list)) {
5865 if (h2s->flags & H2_SF_BLK_MFCTL)
5866 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5867 else
5868 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005869 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02005870 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005871 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005872 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005873}
5874
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005875/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
5876 * The <es> pointer is not allowed to differ from the one passed to the
5877 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005878 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005879static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005880{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005881 struct h2s *h2s = cs->ctx;
5882
Willy Tarreau7838a792019-08-12 18:42:03 +02005883 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005884
5885 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005886 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005887
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005888 es->events &= ~event_type;
5889 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01005890 h2s->subs = NULL;
5891
5892 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005893 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005894
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005895 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005896 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005897 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005898 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
5899 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005900 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01005901
Willy Tarreau7838a792019-08-12 18:42:03 +02005902 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005903 return 0;
5904}
5905
5906
Olivier Houchard511efea2018-08-16 15:30:32 +02005907/* Called from the upper layer, to receive data */
5908static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5909{
Olivier Houchard638b7992018-08-16 15:41:52 +02005910 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005911 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005912 struct htx *h2s_htx = NULL;
5913 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005914 size_t ret = 0;
5915
Willy Tarreau7838a792019-08-12 18:42:03 +02005916 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
5917
Olivier Houchard511efea2018-08-16 15:30:32 +02005918 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005919 h2s_htx = htx_from_buf(&h2s->rxbuf);
5920 if (htx_is_empty(h2s_htx)) {
5921 /* Here htx_to_buf() will set buffer data to 0 because
5922 * the HTX is empty.
5923 */
5924 htx_to_buf(h2s_htx, &h2s->rxbuf);
5925 goto end;
5926 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005927
Christopher Faulet9b79a102019-07-15 11:22:56 +02005928 ret = h2s_htx->data;
5929 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005930
Christopher Faulet9b79a102019-07-15 11:22:56 +02005931 /* <buf> is empty and the message is small enough, swap the
5932 * buffers. */
5933 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005934 htx_to_buf(buf_htx, buf);
5935 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02005936 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5937 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01005938 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02005939
5940 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
5941
5942 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
5943 buf_htx->flags |= HTX_FL_PARSING_ERROR;
5944 if (htx_is_empty(buf_htx))
5945 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01005946 }
Christopher Faulet810df062020-07-22 16:20:34 +02005947 else if (htx_is_empty(h2s_htx))
5948 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOI);
Olivier Houchard511efea2018-08-16 15:30:32 +02005949
Christopher Faulet9b79a102019-07-15 11:22:56 +02005950 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
5951 htx_to_buf(buf_htx, buf);
5952 htx_to_buf(h2s_htx, &h2s->rxbuf);
5953 ret -= h2s_htx->data;
5954
Christopher Faulet37070b22019-02-14 15:12:14 +01005955 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005956 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005957 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005958 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005959 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005960 if (h2s->flags & H2_SF_ES_RCVD)
5961 cs->flags |= CS_FL_EOI;
Christopher Fauletaade4ed2020-10-08 15:38:41 +02005962 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02005963 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005964 if (cs->flags & CS_FL_ERR_PENDING)
5965 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005966 if (b_size(&h2s->rxbuf)) {
5967 b_free(&h2s->rxbuf);
5968 offer_buffers(NULL, tasks_run_queue);
5969 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005970 }
5971
Willy Tarreau082f5592018-11-25 08:03:32 +01005972 if (ret && h2c->dsi == h2s->id) {
5973 /* demux is blocking on this stream's buffer */
5974 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005975 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005976 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005977
Willy Tarreau7838a792019-08-12 18:42:03 +02005978 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02005979 return ret;
5980}
5981
Olivier Houchardd846c262018-10-19 17:24:29 +02005982
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005983/* Called from the upper layer, to send data from buffer <buf> for no more than
5984 * <count> bytes. Returns the number of bytes effectively sent. Some status
5985 * flags may be updated on the conn_stream.
5986 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005987static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005988{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005989 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005990 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005991 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005992 struct htx *htx;
5993 struct htx_blk *blk;
5994 enum htx_blk_type btype;
5995 uint32_t bsize;
5996 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005997
Willy Tarreau7838a792019-08-12 18:42:03 +02005998 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
5999
Olivier Houchardd360ac62019-03-22 17:37:16 +01006000 /* If we were not just woken because we wanted to send but couldn't,
6001 * and there's somebody else that is waiting to send, do nothing,
6002 * we will subscribe later and be put at the end of the list
6003 */
Willy Tarreaud9464162020-01-10 18:25:07 +01006004 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02006005 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
6006 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 +01006007 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006008 }
Willy Tarreaud9464162020-01-10 18:25:07 +01006009 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02006010
Willy Tarreau7838a792019-08-12 18:42:03 +02006011 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
6012 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 +02006013 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02006014 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02006015
Willy Tarreaucab22952019-10-31 15:48:18 +01006016 if (h2s->h2c->st0 >= H2_CS_ERROR) {
6017 cs->flags |= CS_FL_ERROR;
6018 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);
6019 return 0;
6020 }
6021
Christopher Faulet9b79a102019-07-15 11:22:56 +02006022 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006023
Willy Tarreau0bad0432018-06-14 16:54:01 +02006024 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01006025 h2s->flags |= H2_SF_OUTGOING_DATA;
6026
Willy Tarreau751f2d02018-10-05 09:35:00 +02006027 if (h2s->id == 0) {
6028 int32_t id = h2c_get_next_sid(h2s->h2c);
6029
6030 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02006031 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02006032 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 +02006033 return 0;
6034 }
6035
6036 eb32_delete(&h2s->by_id);
6037 h2s->by_id.key = h2s->id = id;
6038 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01006039 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02006040 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
6041 }
6042
Christopher Faulet9b79a102019-07-15 11:22:56 +02006043 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
6044 count && !htx_is_empty(htx)) {
6045 idx = htx_get_head(htx);
6046 blk = htx_get_blk(htx, idx);
6047 btype = htx_get_blk_type(blk);
6048 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006049
Christopher Faulet9b79a102019-07-15 11:22:56 +02006050 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02006051 case HTX_BLK_REQ_SL:
6052 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006053 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02006054 if (ret > 0) {
6055 total += ret;
6056 count -= ret;
6057 if (ret < bsize)
6058 goto done;
6059 }
6060 break;
6061
Willy Tarreau115e83b2018-12-01 19:17:53 +01006062 case HTX_BLK_RES_SL:
6063 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006064 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01006065 if (ret > 0) {
6066 total += ret;
6067 count -= ret;
6068 if (ret < bsize)
6069 goto done;
6070 }
6071 break;
6072
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006073 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006074 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006075 /* all these cause the emission of a DATA frame (possibly empty).
6076 * This EOM necessarily is one before trailers, as the EOM following
6077 * trailers would have been consumed by the trailers parser.
6078 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006079 ret = h2s_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006080 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01006081 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01006082 total += ret;
6083 count -= ret;
6084 if (ret < bsize)
6085 goto done;
6086 }
6087 break;
6088
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006089 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02006090 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006091 /* This is the first trailers block, all the subsequent ones AND
6092 * the EOM will be swallowed by the parser.
6093 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02006094 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01006095 if (ret > 0) {
6096 total += ret;
6097 count -= ret;
6098 if (ret < bsize)
6099 goto done;
6100 }
6101 break;
6102
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006103 default:
6104 htx_remove_blk(htx, blk);
6105 total += bsize;
6106 count -= bsize;
6107 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006108 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01006109 }
6110
Christopher Faulet9b79a102019-07-15 11:22:56 +02006111 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02006112 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02006113 /* trim any possibly pending data after we close (extra CR-LF,
6114 * unprocessed trailers, abnormal extra data, ...)
6115 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02006116 total += count;
6117 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02006118 }
6119
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006120 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01006121 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006122 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 +01006123 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01006124 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01006125 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01006126 }
6127
Christopher Faulet9b79a102019-07-15 11:22:56 +02006128 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02006129
Olivier Houchard7505f942018-08-21 18:10:44 +02006130 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006131 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau7838a792019-08-12 18:42:03 +02006132 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 +02006133 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Olivier Houchardd846c262018-10-19 17:24:29 +02006134
Olivier Houchard7505f942018-08-21 18:10:44 +02006135 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01006136 /* If we're waiting for flow control, and we got a shutr on the
6137 * connection, we will never be unlocked, so add an error on
6138 * the conn_stream.
6139 */
6140 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
6141 !b_data(&h2s->h2c->dbuf) &&
6142 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006143 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 +01006144 if (cs->flags & CS_FL_EOS)
6145 cs->flags |= CS_FL_ERROR;
6146 else
6147 cs->flags |= CS_FL_ERR_PENDING;
6148 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006149
Willy Tarreau5723f292020-01-10 15:16:57 +01006150 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6151 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006152 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006153 LIST_DEL_INIT(&h2s->list);
6154 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006155
Willy Tarreau7838a792019-08-12 18:42:03 +02006156 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006157 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006158}
6159
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006160/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02006161static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006162{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006163 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006164 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006165 struct eb32_node *node;
6166 int fctl_cnt = 0;
6167 int send_cnt = 0;
6168 int tree_cnt = 0;
6169 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006170 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006171
6172 if (!h2c)
6173 return;
6174
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006175 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006176 fctl_cnt++;
6177
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006178 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006179 send_cnt++;
6180
Willy Tarreau3af37712018-12-18 14:34:41 +01006181 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006182 node = eb32_first(&h2c->streams_by_id);
6183 while (node) {
6184 h2s = container_of(node, struct h2s, by_id);
6185 tree_cnt++;
6186 if (!h2s->cs)
6187 orph_cnt++;
6188 node = eb32_next(node);
6189 }
6190
Willy Tarreau60f62682019-05-26 11:32:27 +02006191 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006192 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006193 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006194 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006195 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6196 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006197 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006198 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006199 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006200 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6201 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6202 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006203 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6204 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6205 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006206 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6207 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006208
6209 if (h2s) {
Willy Tarreauab2ec452019-08-30 07:07:08 +02006210 chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s.flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
6211 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006212 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6213 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6214 h2s->cs);
6215 if (h2s->cs)
6216 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
6217 h2s->cs->flags, h2s->cs->data);
6218 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006219}
Willy Tarreau62f52692017-10-08 23:01:42 +02006220
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006221/* Migrate the the connection to the current thread.
6222 * Return 0 if successful, non-zero otherwise.
6223 * Expected to be called with the old thread lock held.
6224 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006225static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006226{
6227 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006228 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006229
6230 if (fd_takeover(conn->handle.fd, conn) != 0)
6231 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006232
6233 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6234 /* We failed to takeover the xprt, even if the connection may
6235 * still be valid, flag it as error'd, as we have already
6236 * taken over the fd, and wake the tasklet, so that it will
6237 * destroy it.
6238 */
6239 conn->flags |= CO_FL_ERROR;
6240 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6241 return -1;
6242 }
6243
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006244 if (h2c->wait_event.events)
6245 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6246 h2c->wait_event.events, &h2c->wait_event);
6247 /* To let the tasklet know it should free itself, and do nothing else,
6248 * set its context to NULL.
6249 */
6250 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006251 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006252
6253 task = h2c->task;
6254 if (task) {
6255 task->context = NULL;
6256 h2c->task = NULL;
6257 __ha_barrier_store();
6258 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006259
6260 h2c->task = task_new(tid_bit);
6261 if (!h2c->task) {
6262 h2_release(h2c);
6263 return -1;
6264 }
6265 h2c->task->process = h2_timeout_task;
6266 h2c->task->context = h2c;
6267 }
6268 h2c->wait_event.tasklet = tasklet_new();
6269 if (!h2c->wait_event.tasklet) {
6270 h2_release(h2c);
6271 return -1;
6272 }
6273 h2c->wait_event.tasklet->process = h2_io_cb;
6274 h2c->wait_event.tasklet->context = h2c;
6275 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6276 SUB_RETRY_RECV, &h2c->wait_event);
6277
6278 return 0;
6279}
6280
Willy Tarreau62f52692017-10-08 23:01:42 +02006281/*******************************************************/
6282/* functions below are dedicated to the config parsers */
6283/*******************************************************/
6284
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006285/* config parser for global "tune.h2.header-table-size" */
6286static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
6287 struct proxy *defpx, const char *file, int line,
6288 char **err)
6289{
6290 if (too_many_args(1, args, err, NULL))
6291 return -1;
6292
6293 h2_settings_header_table_size = atoi(args[1]);
6294 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6295 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6296 return -1;
6297 }
6298 return 0;
6299}
Willy Tarreau62f52692017-10-08 23:01:42 +02006300
Willy Tarreaue6baec02017-07-27 11:45:11 +02006301/* config parser for global "tune.h2.initial-window-size" */
6302static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
6303 struct proxy *defpx, const char *file, int line,
6304 char **err)
6305{
6306 if (too_many_args(1, args, err, NULL))
6307 return -1;
6308
6309 h2_settings_initial_window_size = atoi(args[1]);
6310 if (h2_settings_initial_window_size < 0) {
6311 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6312 return -1;
6313 }
6314 return 0;
6315}
6316
Willy Tarreau5242ef82017-07-27 11:47:28 +02006317/* config parser for global "tune.h2.max-concurrent-streams" */
6318static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
6319 struct proxy *defpx, const char *file, int line,
6320 char **err)
6321{
6322 if (too_many_args(1, args, err, NULL))
6323 return -1;
6324
6325 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006326 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006327 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6328 return -1;
6329 }
6330 return 0;
6331}
6332
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006333/* config parser for global "tune.h2.max-frame-size" */
6334static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
6335 struct proxy *defpx, const char *file, int line,
6336 char **err)
6337{
6338 if (too_many_args(1, args, err, NULL))
6339 return -1;
6340
6341 h2_settings_max_frame_size = atoi(args[1]);
6342 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6343 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6344 return -1;
6345 }
6346 return 0;
6347}
6348
Willy Tarreau62f52692017-10-08 23:01:42 +02006349
6350/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006351/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006352/***************************************/
6353
6354/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006355static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006356 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006357 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006358 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006359 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006360 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006361 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006362 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006363 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006364 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006365 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006366 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006367 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006368 .shutr = h2_shutr,
6369 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006370 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006371 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006372 .takeover = h2_takeover,
Amaury Denoyelle3d3c0912020-10-14 18:17:06 +02006373 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK,
Willy Tarreau62f52692017-10-08 23:01:42 +02006374 .name = "H2",
6375};
6376
Christopher Faulet32f61c02018-04-10 14:33:41 +02006377static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006378 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006379
Willy Tarreau0108d902018-11-25 19:14:37 +01006380INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6381
Willy Tarreau62f52692017-10-08 23:01:42 +02006382/* config keyword parsers */
6383static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006384 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006385 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006386 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006387 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006388 { 0, NULL, NULL }
6389}};
6390
Willy Tarreau0108d902018-11-25 19:14:37 +01006391INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006392
6393/* initialize internal structs after the config is parsed.
6394 * Returns zero on success, non-zero on error.
6395 */
6396static int init_h2()
6397{
6398 pool_head_hpack_tbl = create_pool("hpack_tbl",
6399 h2_settings_header_table_size,
6400 MEM_F_SHARED|MEM_F_EXACT);
Christopher Faulet52140992020-11-06 15:23:39 +01006401 if (!pool_head_hpack_tbl) {
6402 ha_alert("failed to allocate hpack_tbl memory pool\n");
6403 return (ERR_ALERT | ERR_FATAL);
6404 }
6405 return ERR_NONE;
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006406}
6407
6408REGISTER_POST_CHECK(init_h2);