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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
13#include <common/cfgparse.h>
14#include <common/config.h>
Willy Tarreauafba57a2018-12-11 13:44:24 +010015#include <common/h1.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020016#include <common/h2.h>
Willy Tarreau13278b42017-10-13 19:23:14 +020017#include <common/hpack-dec.h>
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +020018#include <common/hpack-enc.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020019#include <common/hpack-tbl.h>
Willy Tarreaub96b77e2018-12-11 10:22:41 +010020#include <common/htx.h>
Willy Tarreau0108d902018-11-25 19:14:37 +010021#include <common/initcall.h>
Willy Tarreaue4820742017-07-27 13:37:23 +020022#include <common/net_helper.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020023#include <proto/connection.h>
Willy Tarreaubcd3bb32018-12-01 18:59:00 +010024#include <proto/http_htx.h>
Willy Tarreau12ae2122019-08-08 18:23:12 +020025#include <proto/trace.h>
Olivier Houchard44d59142018-12-13 18:46:22 +010026#include <proto/session.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020027#include <proto/stream.h>
Olivier Houchard44d59142018-12-13 18:46:22 +010028#include <proto/stream_interface.h>
Willy Tarreauea392822017-10-31 10:02:25 +010029#include <types/session.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020030#include <eb32tree.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 */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200131 struct eb_root streams_by_id; /* all active streams by their ID */
132 struct list send_list; /* list of blocked streams requesting to send */
133 struct list fctl_list; /* list of streams blocked by connection's fctl */
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200134 struct list blocked_list; /* list of streams blocked for other reasons (e.g. sfctl, dep) */
Olivier Houchardd846c262018-10-19 17:24:29 +0200135 struct list sending_list; /* list of h2s scheduled to send data */
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 Tarreau454f9052017-10-26 19:40:35 +0200180
Christopher Faulet3e395632019-09-13 09:37:21 +0200181/* unused flags: 0x00000200, 0x00000400, 0x00000800 */
Willy Tarreau454f9052017-10-26 19:40:35 +0200182
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
194 * it is being processed in the internal HTTP representation (H1 for now).
195 */
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 Tarreaua40704a2018-09-11 13:52:04 +0200200 struct h1m h1m; /* request or response parser state for H1 */
Willy Tarreau18312642017-10-11 07:57:07 +0200201 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200202 int32_t id; /* stream ID */
203 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200204 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200205 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
206 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200207 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100208 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200209 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200210 struct wait_event wait_event; /* Wait list, when we're attempting to send a RST but we can't send */
Willy Tarreau749f5ca2019-03-21 19:19:36 +0100211 struct wait_event *recv_wait; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
212 struct wait_event *send_wait; /* send wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200213 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Olivier Houchardd360ac62019-03-22 17:37:16 +0100214 struct list sending_list; /* To be used when adding in h2c->sending_list */
Willy Tarreau18312642017-10-11 07:57:07 +0200215};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200216
Willy Tarreauc6405142017-09-21 20:23:50 +0200217/* descriptor for an h2 frame header */
218struct h2_fh {
219 uint32_t len; /* length, host order, 24 bits */
220 uint32_t sid; /* stream id, host order, 31 bits */
221 uint8_t ft; /* frame type */
222 uint8_t ff; /* frame flags */
223};
224
Willy Tarreau12ae2122019-08-08 18:23:12 +0200225/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200226static void h2_trace(enum trace_level level, uint64_t mask, \
227 const struct trace_source *src,
228 const struct ist where, const struct ist func,
229 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200230
231/* The event representation is split like this :
232 * strm - application layer
233 * h2s - internal H2 stream
234 * h2c - internal H2 connection
235 * conn - external connection
236 *
237 */
238static const struct trace_event h2_trace_events[] = {
239#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200240 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200241#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200242 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200243#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200244 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200245#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200246 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200247#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200248 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200249#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200250 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200251#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200252 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200253#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200254 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200255#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200256 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200257#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200258 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200259#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200260 { .mask = H2_EV_RX_EOI, .name = "rx_eoi", .desc = "receipt of end of H2 input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200261#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200262 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200263#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200264 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200265#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200266 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200267#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200268 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200269#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200270 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200271#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200272 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200273#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200274 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200275#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200276 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200277#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200278 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200279#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200280 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200281#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200282 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200283#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200284 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200285#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200286 { .mask = H2_EV_TX_EOI, .name = "tx_eoi", .desc = "transmission of H2 end of input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200287#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200288 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200289#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200290 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200291#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200292 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200293#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200294 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200295#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200296 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200297#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200298 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200299#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200300 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200301#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200302 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200303#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200304 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200305#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200306 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200307#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200308 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200309#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200310 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200311#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200312 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200313#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200314 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200315#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200316 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200317#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200318 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200319#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200320 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200321#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200322 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200323#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200324 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200325#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200326 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200327#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200328 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200329#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200330 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200331#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200332 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200333#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200334 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200335#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200336 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200337#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200338 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200339#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200340 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200341#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200342 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200343 { }
344};
345
346static const struct name_desc h2_trace_lockon_args[4] = {
347 /* arg1 */ { /* already used by the connection */ },
348 /* arg2 */ { .name="h2s", .desc="H2 stream" },
349 /* arg3 */ { },
350 /* arg4 */ { }
351};
352
353static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200354#define H2_VERB_CLEAN 1
355 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
356#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200357 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200358#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200359 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200360#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200361 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200362#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200363 { .name="complete", .desc="add full data dump when available" },
364 { /* end */ }
365};
366
367static struct trace_source trace_h2 = {
368 .name = IST("h2"),
369 .desc = "HTTP/2 multiplexer",
370 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200371 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200372 .known_events = h2_trace_events,
373 .lockon_args = h2_trace_lockon_args,
374 .decoding = h2_trace_decoding,
375 .report_events = ~0, // report everything by default
376};
377
378#define TRACE_SOURCE &trace_h2
379INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
380
Willy Tarreau8ceae722018-11-26 11:58:30 +0100381/* the h2c connection pool */
382DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
383
384/* the h2s stream pool */
385DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
386
Willy Tarreaudc572362018-12-12 08:08:05 +0100387/* The default connection window size is 65535, it may only be enlarged using
388 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
389 * we'll pretend we already received the difference between the two to send
390 * an equivalent window update to enlarge it to 2G-1.
391 */
392#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
393
Willy Tarreau455d5682019-05-24 19:42:18 +0200394/* maximum amount of data we're OK with re-aligning for buffer optimizations */
395#define MAX_DATA_REALIGN 1024
396
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200397/* a few settings from the global section */
398static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200399static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100400static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100401static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200402
Willy Tarreau2a856182017-05-16 15:20:39 +0200403/* a dmumy closed stream */
404static const struct h2s *h2_closed_stream = &(const struct h2s){
405 .cs = NULL,
406 .h2c = NULL,
407 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100408 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100409 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200410 .id = 0,
411};
412
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100413/* a dmumy closed stream returning a PROTOCOL_ERROR error */
414static const struct h2s *h2_error_stream = &(const struct h2s){
415 .cs = NULL,
416 .h2c = NULL,
417 .st = H2_SS_CLOSED,
418 .errcode = H2_ERR_PROTOCOL_ERROR,
419 .flags = 0,
420 .id = 0,
421};
422
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100423/* a dmumy closed stream returning a REFUSED_STREAM error */
424static const struct h2s *h2_refused_stream = &(const struct h2s){
425 .cs = NULL,
426 .h2c = NULL,
427 .st = H2_SS_CLOSED,
428 .errcode = H2_ERR_REFUSED_STREAM,
429 .flags = 0,
430 .id = 0,
431};
432
Willy Tarreau2a856182017-05-16 15:20:39 +0200433/* and a dummy idle stream for use with any unannounced stream */
434static const struct h2s *h2_idle_stream = &(const struct h2s){
435 .cs = NULL,
436 .h2c = NULL,
437 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100438 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200439 .id = 0,
440};
441
Olivier Houchard9f6af332018-05-25 14:04:04 +0200442static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200443static int h2_send(struct h2c *h2c);
444static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200445static int h2_process(struct h2c *h2c);
Olivier Houchard29fb89d2018-08-02 18:56:36 +0200446static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100447static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100448static 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 +0100449static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200450static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100451static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100452static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200453
Willy Tarreauab2ec452019-08-30 07:07:08 +0200454/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
455static inline const char *h2c_st_to_str(enum h2_cs st)
456{
457 switch (st) {
458 case H2_CS_PREFACE: return "PRF";
459 case H2_CS_SETTINGS1: return "STG";
460 case H2_CS_FRAME_H: return "FRH";
461 case H2_CS_FRAME_P: return "FRP";
462 case H2_CS_FRAME_A: return "FRA";
463 case H2_CS_FRAME_E: return "FRE";
464 case H2_CS_ERROR: return "ERR";
465 case H2_CS_ERROR2: return "ER2";
466 default: return "???";
467 }
468}
469
470/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
471static inline const char *h2s_st_to_str(enum h2_ss st)
472{
473 switch (st) {
474 case H2_SS_IDLE: return "IDL"; // idle
475 case H2_SS_RLOC: return "RSL"; // reserved local
476 case H2_SS_RREM: return "RSR"; // reserved remote
477 case H2_SS_OPEN: return "OPN"; // open
478 case H2_SS_HREM: return "HCR"; // half-closed remote
479 case H2_SS_HLOC: return "HCL"; // half-closed local
480 case H2_SS_ERROR : return "ERR"; // error
481 case H2_SS_CLOSED: return "CLO"; // closed
482 default: return "???";
483 }
484}
485
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200486/* the H2 traces always expect that arg1, if non-null, is of type connection
487 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
488 * that arg3, if non-null, is either of type htx for tx headers, or of type
489 * buffer for everything else.
490 */
491static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
492 const struct ist where, const struct ist func,
493 const void *a1, const void *a2, const void *a3, const void *a4)
494{
495 const struct connection *conn = a1;
496 const struct h2c *h2c = conn ? conn->ctx : NULL;
497 const struct h2s *h2s = a2;
498 const struct buffer *buf = a3;
499 const struct htx *htx;
500 int pos;
501
502 if (!h2c) // nothing to add
503 return;
504
Willy Tarreau17104d42019-08-30 07:12:55 +0200505 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200506 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
507
508 if (h2c->dsi >= 0 &&
509 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
510 chunk_appendf(&trace_buf, " dft=%s/%02x", h2_ft_str(h2c->dft), h2c->dff);
511 }
512
513 if (h2s) {
514 if (h2s->id <= 0)
515 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
516 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
517 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200518 }
519
520 /* Let's dump decoded requests and responses right after parsing. They
521 * are traced at level USER with a few recognizable flags.
522 */
523 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
524 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
525 htx = htxbuf(buf); // recv req/res
526 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
527 htx = a3; // send req/res
528 else
529 htx = NULL;
530
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200531 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200532 const struct htx_blk *blk = htx_get_blk(htx, pos);
533 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
534 enum htx_blk_type type = htx_get_blk_type(blk);
535
536 if (type == HTX_BLK_REQ_SL)
537 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200538 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200539 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
540 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
541 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
542 else if (type == HTX_BLK_RES_SL)
543 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200544 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200545 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
546 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
547 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
548 }
549}
550
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200551/* returns true if the connection is allowed to expire, false otherwise. A
552 * connection may expire when:
553 * - it has no stream
554 * - it has data in the mux buffer
555 * - it has streams in the blocked list
556 * - it has streams in the fctl list
557 * - it has streams in the send list
558 * Otherwise it means some streams are waiting in the data layer and it should
559 * not expire.
560 */
561static inline int h2c_may_expire(const struct h2c *h2c)
562{
563 return eb_is_empty(&h2c->streams_by_id) ||
564 br_data(h2c->mbuf) ||
565 !LIST_ISEMPTY(&h2c->blocked_list) ||
566 !LIST_ISEMPTY(&h2c->fctl_list) ||
567 !LIST_ISEMPTY(&h2c->send_list) ||
568 !LIST_ISEMPTY(&h2c->sending_list);
569}
570
Olivier Houchard7a977432019-03-21 15:47:13 +0100571static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200572h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100573{
574 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
575 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
576 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
577 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200578 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100579 (conn_xprt_read0_pending(h2c->conn) ||
580 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
581 return 1;
582
583 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100584}
585
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200586/*****************************************************/
587/* functions below are for dynamic buffer management */
588/*****************************************************/
589
Willy Tarreau315d8072017-12-10 22:17:57 +0100590/* indicates whether or not the we may call the h2_recv() function to attempt
591 * to receive data into the buffer and/or demux pending data. The condition is
592 * a bit complex due to some API limits for now. The rules are the following :
593 * - if an error or a shutdown was detected on the connection and the buffer
594 * is empty, we must not attempt to receive
595 * - if the demux buf failed to be allocated, we must not try to receive and
596 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100597 * - if no flag indicates a blocking condition, we may attempt to receive,
598 * regardless of whether the demux buffer is full or not, so that only
599 * de demux part decides whether or not to block. This is needed because
600 * the connection API indeed prevents us from re-enabling receipt that is
601 * already enabled in a polled state, so we must always immediately stop
602 * as soon as the demux can't proceed so as never to hit an end of read
603 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100604 * - otherwise must may not attempt
605 */
606static inline int h2_recv_allowed(const struct h2c *h2c)
607{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200608 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100609 (h2c->st0 >= H2_CS_ERROR ||
610 h2c->conn->flags & CO_FL_ERROR ||
611 conn_xprt_read0_pending(h2c->conn)))
612 return 0;
613
614 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100615 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100616 return 1;
617
618 return 0;
619}
620
Willy Tarreau47b515a2018-12-21 16:09:41 +0100621/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200622static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100623{
624 if (!h2_recv_allowed(h2c))
625 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200626 if ((!consider_buffer || !b_data(&h2c->dbuf))
627 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100628 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200629 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100630}
631
632
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100633/* returns true if the front connection has too many conn_streams attached */
634static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200635{
Willy Tarreaua8754662018-12-23 20:43:58 +0100636 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200637}
638
Willy Tarreau44e973f2018-03-01 17:49:30 +0100639/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
640 * flags are used to figure what buffer was requested. It returns 1 if the
641 * allocation succeeds, in which case the connection is woken up, or 0 if it's
642 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200643 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100644static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200645{
646 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100647 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200648
Willy Tarreau44e973f2018-03-01 17:49:30 +0100649 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200650 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200651 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200652 return 1;
653 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200654
Willy Tarreau51330962019-05-26 09:38:07 +0200655 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100656 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200657
658 if (h2c->flags & H2_CF_DEM_MROOM) {
659 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200660 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200661 }
Willy Tarreau14398122017-09-22 14:26:04 +0200662 return 1;
663 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100664
665 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
666 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200667 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100668 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200669 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100670 return 1;
671 }
672
Willy Tarreau14398122017-09-22 14:26:04 +0200673 return 0;
674}
675
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200676static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200677{
678 struct buffer *buf = NULL;
679
Willy Tarreauc234ae32019-05-13 17:56:11 +0200680 if (likely(!LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100681 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
682 h2c->buf_wait.target = h2c;
683 h2c->buf_wait.wakeup_cb = h2_buf_available;
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100684 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100685 LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100686 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau14398122017-09-22 14:26:04 +0200687 __conn_xprt_stop_recv(h2c->conn);
688 }
689 return buf;
690}
691
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200692static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200693{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200694 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100695 b_free(bptr);
Willy Tarreau201840a2019-05-29 17:50:48 +0200696 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200697 }
698}
699
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200700static inline void h2_release_mbuf(struct h2c *h2c)
701{
702 struct buffer *buf;
703 unsigned int count = 0;
704
705 while (b_size(buf = br_head_pick(h2c->mbuf))) {
706 b_free(buf);
707 count++;
708 }
709 if (count)
Willy Tarreau201840a2019-05-29 17:50:48 +0200710 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200711}
712
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100713/* returns the number of allocatable outgoing streams for the connection taking
714 * the last_sid and the reserved ones into account.
715 */
716static inline int h2_streams_left(const struct h2c *h2c)
717{
718 int ret;
719
720 /* consider the number of outgoing streams we're allowed to create before
721 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
722 * nb_reserved is the number of streams which don't yet have an ID.
723 */
724 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
725 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
726 if (ret < 0)
727 ret = 0;
728 return ret;
729}
730
Willy Tarreau00f18a32019-01-26 12:19:01 +0100731/* returns the number of streams in use on a connection to figure if it's
732 * idle or not. We check nb_cs and not nb_streams as the caller will want
733 * to know if it was the last one after a detach().
734 */
735static int h2_used_streams(struct connection *conn)
736{
737 struct h2c *h2c = conn->ctx;
738
739 return h2c->nb_cs;
740}
741
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100742/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100743static int h2_avail_streams(struct connection *conn)
744{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100745 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100746 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100747 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100748
Willy Tarreau6afec462019-01-28 06:40:19 +0100749 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
750 * streams on the connection.
751 */
752 if (h2c->last_sid >= 0)
753 return 0;
754
Willy Tarreau86949782019-01-31 10:42:05 +0100755 /* note: may be negative if a SETTINGS frame changes the limit */
756 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100757
758 /* we must also consider the limit imposed by stream IDs */
759 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100760 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100761 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100762 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
763 ret1 = MIN(ret1, ret2);
764 }
765 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100766}
767
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200768
Willy Tarreau62f52692017-10-08 23:01:42 +0200769/*****************************************************************/
770/* functions below are dedicated to the mux setup and management */
771/*****************************************************************/
772
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200773/* Initialize the mux once it's attached. For outgoing connections, the context
774 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200775 * connections from the fact that the context is still NULL (even during mux
776 * upgrades). <input> is always used as Input buffer and may contain data. It is
777 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200778 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200779static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
780 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200781{
782 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100783 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200784 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200785
Christopher Fauletf81ef032019-10-04 15:19:43 +0200786 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200787
Willy Tarreaubafbe012017-11-24 17:34:44 +0100788 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200789 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200790 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200791
Christopher Faulete9b70722019-04-08 10:46:02 +0200792 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200793 h2c->flags = H2_CF_IS_BACK;
794 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
795 if (tick_isset(prx->timeout.serverfin))
796 h2c->shut_timeout = prx->timeout.serverfin;
797 } else {
798 h2c->flags = H2_CF_NONE;
799 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
800 if (tick_isset(prx->timeout.clientfin))
801 h2c->shut_timeout = prx->timeout.clientfin;
802 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100803
Willy Tarreau0b37d652018-10-03 10:33:02 +0200804 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100805 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100806 if (tick_isset(h2c->timeout)) {
807 t = task_new(tid_bit);
808 if (!t)
809 goto fail;
810
811 h2c->task = t;
812 t->process = h2_timeout_task;
813 t->context = h2c;
814 t->expire = tick_add(now_ms, h2c->timeout);
815 }
Willy Tarreauea392822017-10-31 10:02:25 +0100816
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200817 h2c->wait_event.tasklet = tasklet_new();
818 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200819 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200820 h2c->wait_event.tasklet->process = h2_io_cb;
821 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100822 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200823
Willy Tarreau32218eb2017-09-22 08:07:25 +0200824 h2c->ddht = hpack_dht_alloc(h2_settings_header_table_size);
825 if (!h2c->ddht)
826 goto fail;
827
828 /* Initialise the context. */
829 h2c->st0 = H2_CS_PREFACE;
830 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100831 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200832 h2c->max_id = -1;
833 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100834 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200835 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100836 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200837 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100838 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100839 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200840
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200841 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200842 h2c->dsi = -1;
843 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100844
Willy Tarreau32218eb2017-09-22 08:07:25 +0200845 h2c->last_sid = -1;
846
Willy Tarreau51330962019-05-26 09:38:07 +0200847 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200848 h2c->miw = 65535; /* mux initial window size */
849 h2c->mws = 65535; /* mux window size */
850 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200851 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200852 LIST_INIT(&h2c->send_list);
853 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200854 LIST_INIT(&h2c->blocked_list);
Olivier Houchardd846c262018-10-19 17:24:29 +0200855 LIST_INIT(&h2c->sending_list);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100856 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200857
Christopher Fauletf81ef032019-10-04 15:19:43 +0200858 conn->ctx = h2c;
859
Willy Tarreau3f133572017-10-31 19:21:06 +0100860 if (t)
861 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100862
Willy Tarreau01b44822018-10-03 14:26:37 +0200863 if (h2c->flags & H2_CF_IS_BACK) {
864 /* FIXME: this is temporary, for outgoing connections we need
865 * to immediately allocate a stream until the code is modified
866 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +0200867 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +0200868 */
869 struct h2s *h2s;
870
Christopher Fauletf81ef032019-10-04 15:19:43 +0200871 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200872 if (!h2s)
873 goto fail_stream;
874 }
875
Willy Tarreau0f383582018-10-03 14:22:21 +0200876 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200877 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +0200878 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200879 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +0200880 fail_stream:
881 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +0200882 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +0200883 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200884 if (h2c->wait_event.tasklet)
885 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +0100886 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +0200887 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +0200888 conn->ctx = conn_ctx; /* restore saved ctx */
889 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200890 return -1;
891}
892
Willy Tarreau751f2d02018-10-05 09:35:00 +0200893/* returns the next allocatable outgoing stream ID for the H2 connection, or
894 * -1 if no more is allocatable.
895 */
896static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
897{
898 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +0100899
900 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +0200901 id = -1;
902 return id;
903}
904
Willy Tarreau2373acc2017-10-12 17:35:14 +0200905/* returns the stream associated with id <id> or NULL if not found */
906static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
907{
908 struct eb32_node *node;
909
Willy Tarreau751f2d02018-10-05 09:35:00 +0200910 if (id == 0)
911 return (struct h2s *)h2_closed_stream;
912
Willy Tarreau2a856182017-05-16 15:20:39 +0200913 if (id > h2c->max_id)
914 return (struct h2s *)h2_idle_stream;
915
Willy Tarreau2373acc2017-10-12 17:35:14 +0200916 node = eb32_lookup(&h2c->streams_by_id, id);
917 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +0200918 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +0200919
920 return container_of(node, struct h2s, by_id);
921}
922
Christopher Faulet73c12072019-04-08 11:23:22 +0200923/* release function. This one should be called to free all resources allocated
924 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +0200925 */
Christopher Faulet73c12072019-04-08 11:23:22 +0200926static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +0200927{
Christopher Faulet61840e72019-04-15 09:33:32 +0200928 struct connection *conn = NULL;;
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200929
Willy Tarreau7838a792019-08-12 18:42:03 +0200930 TRACE_ENTER(H2_EV_H2C_END);
931
Willy Tarreau32218eb2017-09-22 08:07:25 +0200932 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +0200933 /* The connection must be aattached to this mux to be released */
934 if (h2c->conn && h2c->conn->ctx == h2c)
935 conn = h2c->conn;
936
Willy Tarreau7838a792019-08-12 18:42:03 +0200937 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200938 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +0200939
Willy Tarreau186e96e2019-05-28 17:21:18 +0200940 if (LIST_ADDED(&h2c->buf_wait.list)) {
941 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
942 LIST_DEL(&h2c->buf_wait.list);
943 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
944 }
Willy Tarreau14398122017-09-22 14:26:04 +0200945
Willy Tarreau44e973f2018-03-01 17:49:30 +0100946 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200947 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100948
Willy Tarreauea392822017-10-31 10:02:25 +0100949 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +0200950 h2c->task->context = NULL;
951 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +0100952 h2c->task = NULL;
953 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200954 if (h2c->wait_event.tasklet)
955 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +0200956 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +0100957 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +0200958 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +0100959
Willy Tarreaubafbe012017-11-24 17:34:44 +0100960 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200961 }
962
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200963 if (conn) {
964 conn->mux = NULL;
965 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +0200966 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200967
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200968 conn_stop_tracking(conn);
969 conn_full_close(conn);
970 if (conn->destroy_cb)
971 conn->destroy_cb(conn);
972 conn_free(conn);
973 }
Willy Tarreau7838a792019-08-12 18:42:03 +0200974
975 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +0200976}
977
978
Willy Tarreau71681172017-10-23 14:39:06 +0200979/******************************************************/
980/* functions below are for the H2 protocol processing */
981/******************************************************/
982
983/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +0100984static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +0200985{
986 return h2s ? h2s->id : 0;
987}
988
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200989/* returns the sum of the stream's own window size and the mux's initial
990 * window, which together form the stream's effective window size.
991 */
992static inline int h2s_mws(const struct h2s *h2s)
993{
994 return h2s->sws + h2s->h2c->miw;
995}
996
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200997/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100998static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200999{
1000 if (h2c->msi < 0)
1001 return 0;
1002
1003 if (h2c->msi == h2s_id(h2s))
1004 return 0;
1005
1006 return 1;
1007}
1008
Willy Tarreau741d6df2017-10-17 08:00:59 +02001009/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001010static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001011{
Willy Tarreau7838a792019-08-12 18:42:03 +02001012 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn,,, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001013 h2c->errcode = err;
1014 h2c->st0 = H2_CS_ERROR;
1015}
1016
Willy Tarreau175cebb2019-01-24 10:02:24 +01001017/* marks an error on the stream. It may also update an already closed stream
1018 * (e.g. to report an error after an RST was received).
1019 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001020static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001021{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001022 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001023 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s,, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001024 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001025 if (h2s->st < H2_SS_ERROR)
1026 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001027 if (h2s->cs)
1028 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001029 }
1030}
1031
Willy Tarreau7e094452018-12-19 18:08:52 +01001032/* attempt to notify the data layer of recv availability */
1033static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1034{
1035 struct wait_event *sw;
1036
1037 if (h2s->recv_wait) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001038 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau7e094452018-12-19 18:08:52 +01001039 sw = h2s->recv_wait;
1040 sw->events &= ~SUB_RETRY_RECV;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001041 tasklet_wakeup(sw->tasklet);
Willy Tarreau7e094452018-12-19 18:08:52 +01001042 h2s->recv_wait = NULL;
1043 }
1044}
1045
1046/* attempt to notify the data layer of send availability */
1047static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1048{
1049 struct wait_event *sw;
1050
Willy Tarreauc234ae32019-05-13 17:56:11 +02001051 if (h2s->send_wait && !LIST_ADDED(&h2s->sending_list)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001052 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau7e094452018-12-19 18:08:52 +01001053 sw = h2s->send_wait;
1054 sw->events &= ~SUB_RETRY_SEND;
Olivier Houchardfd1e96d2019-03-25 14:04:25 +01001055 LIST_ADDQ(&h2s->h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001056 tasklet_wakeup(sw->tasklet);
Willy Tarreau7e094452018-12-19 18:08:52 +01001057 }
1058}
1059
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001060/* alerts the data layer, trying to wake it up by all means, following
1061 * this sequence :
1062 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1063 * - if its subscribed to send, then it's woken up for send
1064 * - if it was subscribed to neither, its ->wake() callback is called
1065 * It is safe to call this function with a closed stream which doesn't have a
1066 * conn_stream anymore.
1067 */
1068static void __maybe_unused h2s_alert(struct h2s *h2s)
1069{
Willy Tarreau7838a792019-08-12 18:42:03 +02001070 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1071
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001072 if (h2s->recv_wait || h2s->send_wait) {
1073 h2s_notify_recv(h2s);
1074 h2s_notify_send(h2s);
1075 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001076 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1077 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001078 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001079 }
1080
1081 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001082}
1083
Willy Tarreaue4820742017-07-27 13:37:23 +02001084/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001085static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001086{
1087 uint8_t *out = frame;
1088
1089 *out = len >> 16;
1090 write_n16(out + 1, len);
1091}
1092
Willy Tarreau54c15062017-10-10 17:10:03 +02001093/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1094 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1095 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001096 * available in the buffer's input prior to calling this function. The buffer
1097 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001098 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001099static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001100 const struct buffer *b, int o)
1101{
Willy Tarreau591d4452018-06-15 17:21:00 +02001102 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 +02001103}
1104
Willy Tarreau1f094672017-11-20 21:27:45 +01001105static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001106{
Willy Tarreau591d4452018-06-15 17:21:00 +02001107 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001108}
1109
Willy Tarreau1f094672017-11-20 21:27:45 +01001110static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001111{
Willy Tarreau591d4452018-06-15 17:21:00 +02001112 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001113}
1114
Willy Tarreau1f094672017-11-20 21:27:45 +01001115static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001116{
Willy Tarreau591d4452018-06-15 17:21:00 +02001117 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001118}
1119
1120
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001121/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1122 * The algorithm is not obvious. It turns out that H2 headers are neither
1123 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1124 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001125 *
1126 * b0 b1 b2 b3 b4 b5..b8
1127 * +----------+---------+--------+----+----+----------------------+
1128 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1129 * +----------+---------+--------+----+----+----------------------+
1130 *
1131 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1132 * we get the sid properly aligned and ordered, and 16 bits of len properly
1133 * ordered as well. The type and flags can be extracted using bit shifts from
1134 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001135 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1136 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001137 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001138static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001139{
1140 uint64_t w;
1141
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001142 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001143 return 0;
1144
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001145 w = h2_get_n64(b, o + 1);
1146 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001147 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1148 h->ff = w >> 32;
1149 h->ft = w >> 40;
1150 h->len += w >> 48;
1151 return 1;
1152}
1153
1154/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1155 * h2_peek_frame_hdr() above.
1156 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001157static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001158{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001159 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001160}
1161
1162/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001163static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001164{
1165 int ret;
1166
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001167 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001168 if (ret > 0)
1169 h2_skip_frame_hdr(b);
1170 return ret;
1171}
1172
Willy Tarreau00dd0782018-03-01 16:31:34 +01001173/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1174 * its connection if the stream was not yet closed. Please use this exclusively
1175 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001176 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001177static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001178{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001179 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001180 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001181 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001182 if (!h2s->id)
1183 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001184 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001185 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1186 h2s_notify_recv(h2s);
1187 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001188 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001189 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001190 h2s->st = H2_SS_CLOSED;
1191}
1192
Willy Tarreau71049cc2018-03-28 13:56:39 +02001193/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
1194static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001195{
Willy Tarreau7838a792019-08-12 18:42:03 +02001196 struct connection *conn = h2s->h2c->conn;
1197
1198 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1199
Willy Tarreau0a10de62018-03-01 16:27:53 +01001200 h2s_close(h2s);
1201 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001202 if (b_size(&h2s->rxbuf)) {
1203 b_free(&h2s->rxbuf);
1204 offer_buffers(NULL, tasks_run_queue);
1205 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001206 if (h2s->send_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +01001207 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001208 if (h2s->recv_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +01001209 h2s->recv_wait->events &= ~SUB_RETRY_RECV;
Joseph Herlantd77575d2018-11-25 10:54:45 -08001210 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001211 * reference left would be in the h2c send_list/fctl_list, and if
1212 * we're in it, we're getting out anyway
1213 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001214 LIST_DEL_INIT(&h2s->list);
Willy Tarreauc234ae32019-05-13 17:56:11 +02001215 if (LIST_ADDED(&h2s->sending_list)) {
Willy Tarreau86eded62019-06-14 14:47:49 +02001216 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchard998410a2019-04-15 19:23:37 +02001217 LIST_DEL_INIT(&h2s->sending_list);
1218 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001219 tasklet_free(h2s->wait_event.tasklet);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001220 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001221
1222 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001223}
1224
Willy Tarreaua8e49542018-10-03 18:53:55 +02001225/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1226 * stream tree. In case of error, nothing is added and NULL is returned. The
1227 * causes of errors can be any failed memory allocation. The caller is
1228 * responsible for checking if the connection may support an extra stream
1229 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001230 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001231static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001232{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001233 struct h2s *h2s;
1234
Willy Tarreau7838a792019-08-12 18:42:03 +02001235 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1236
Willy Tarreaubafbe012017-11-24 17:34:44 +01001237 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001238 if (!h2s)
1239 goto out;
1240
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001241 h2s->wait_event.tasklet = tasklet_new();
1242 if (!h2s->wait_event.tasklet) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001243 pool_free(pool_head_h2s, h2s);
1244 goto out;
1245 }
1246 h2s->send_wait = NULL;
1247 h2s->recv_wait = NULL;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02001248 h2s->wait_event.tasklet->process = h2_deferred_shut;
1249 h2s->wait_event.tasklet->context = h2s;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01001250 h2s->wait_event.events = 0;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001251 LIST_INIT(&h2s->list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01001252 LIST_INIT(&h2s->sending_list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001253 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001254 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001255 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001256 h2s->flags = H2_SF_NONE;
1257 h2s->errcode = H2_ERR_NO_ERROR;
1258 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001259 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001260 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001261 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001262
1263 if (h2c->flags & H2_CF_IS_BACK) {
1264 h1m_init_req(&h2s->h1m);
1265 h2s->h1m.err_pos = -1; // don't care about errors on the request path
1266 h2s->h1m.flags |= H1_MF_TOLOWER;
1267 } else {
1268 h1m_init_res(&h2s->h1m);
1269 h2s->h1m.err_pos = -1; // don't care about errors on the response path
1270 h2s->h1m.flags |= H1_MF_TOLOWER;
1271 }
1272
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001273 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001274 if (id > 0)
1275 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001276 else
1277 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001278
1279 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001280 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001281 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001282
Willy Tarreau7838a792019-08-12 18:42:03 +02001283 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001284 return h2s;
1285
1286 out_free_h2s:
1287 pool_free(pool_head_h2s, h2s);
1288 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001289 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001290 return NULL;
1291}
1292
1293/* creates a new stream <id> on the h2c connection and returns it, or NULL in
1294 * case of memory allocation error.
1295 */
1296static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
1297{
1298 struct session *sess = h2c->conn->owner;
1299 struct conn_stream *cs;
1300 struct h2s *h2s;
1301
Willy Tarreau7838a792019-08-12 18:42:03 +02001302 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1303
Willy Tarreaua8e49542018-10-03 18:53:55 +02001304 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1305 goto out;
1306
1307 h2s = h2s_new(h2c, id);
1308 if (!h2s)
1309 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001310
1311 cs = cs_new(h2c->conn);
1312 if (!cs)
1313 goto out_close;
1314
Olivier Houchard746fb772018-12-15 19:42:00 +01001315 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001316 h2s->cs = cs;
1317 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001318 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001319
1320 if (stream_create_from_cs(cs) < 0)
1321 goto out_free_cs;
1322
Willy Tarreau590a0512018-09-05 11:56:48 +02001323 /* We want the accept date presented to the next stream to be the one
1324 * we have now, the handshake time to be null (since the next stream
1325 * is not delayed by a handshake), and the idle time to count since
1326 * right now.
1327 */
1328 sess->accept_date = date;
1329 sess->tv_accept = now;
1330 sess->t_handshake = 0;
1331
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001332 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001333 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001334 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001335 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001336 return h2s;
1337
1338 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001339 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001340 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001341 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001342 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001343 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001344 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001345 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001346 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001347 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001348}
1349
Willy Tarreau751f2d02018-10-05 09:35:00 +02001350/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1351 * and returns it, or NULL in case of memory allocation error or if the highest
1352 * possible stream ID was reached.
1353 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001354static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001355{
1356 struct h2s *h2s = NULL;
1357
Willy Tarreau7838a792019-08-12 18:42:03 +02001358 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1359
Willy Tarreau86949782019-01-31 10:42:05 +01001360 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001361 goto out;
1362
Willy Tarreaua80dca82019-01-24 17:08:28 +01001363 if (h2_streams_left(h2c) < 1)
1364 goto out;
1365
Willy Tarreau751f2d02018-10-05 09:35:00 +02001366 /* Defer choosing the ID until we send the first message to create the stream */
1367 h2s = h2s_new(h2c, 0);
1368 if (!h2s)
1369 goto out;
1370
1371 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001372 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001373 cs->ctx = h2s;
1374 h2c->nb_cs++;
1375
Willy Tarreau751f2d02018-10-05 09:35:00 +02001376 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001377 if (likely(h2s))
1378 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1379 else
1380 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001381 return h2s;
1382}
1383
Willy Tarreaube5b7152017-09-25 16:25:39 +02001384/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1385 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1386 * the various settings codes.
1387 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001388static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001389{
1390 struct buffer *res;
1391 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001392 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001393 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001394 int ret = 0;
1395
1396 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001397
1398 if (h2c_mux_busy(h2c, NULL)) {
1399 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001400 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001401 }
1402
Willy Tarreaube5b7152017-09-25 16:25:39 +02001403 chunk_init(&buf, buf_data, sizeof(buf_data));
1404 chunk_memcpy(&buf,
1405 "\x00\x00\x00" /* length : 0 for now */
1406 "\x04\x00" /* type : 4 (settings), flags : 0 */
1407 "\x00\x00\x00\x00", /* stream ID : 0 */
1408 9);
1409
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001410 if (h2c->flags & H2_CF_IS_BACK) {
1411 /* send settings_enable_push=0 */
1412 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1413 }
1414
Willy Tarreaube5b7152017-09-25 16:25:39 +02001415 if (h2_settings_header_table_size != 4096) {
1416 char str[6] = "\x00\x01"; /* header_table_size */
1417
1418 write_n32(str + 2, h2_settings_header_table_size);
1419 chunk_memcat(&buf, str, 6);
1420 }
1421
1422 if (h2_settings_initial_window_size != 65535) {
1423 char str[6] = "\x00\x04"; /* initial_window_size */
1424
1425 write_n32(str + 2, h2_settings_initial_window_size);
1426 chunk_memcat(&buf, str, 6);
1427 }
1428
1429 if (h2_settings_max_concurrent_streams != 0) {
1430 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1431
1432 /* Note: 0 means "unlimited" for haproxy's config but not for
1433 * the protocol, so never send this value!
1434 */
1435 write_n32(str + 2, h2_settings_max_concurrent_streams);
1436 chunk_memcat(&buf, str, 6);
1437 }
1438
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001439 mfs = h2_settings_max_frame_size;
1440 if (mfs > global.tune.bufsize)
1441 mfs = global.tune.bufsize;
1442
1443 if (!mfs)
1444 mfs = global.tune.bufsize;
1445
1446 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001447 char str[6] = "\x00\x05"; /* max_frame_size */
1448
1449 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1450 * match bufsize - rewrite size, but at the moment it seems
1451 * that clients don't take care of it.
1452 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001453 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001454 chunk_memcat(&buf, str, 6);
1455 }
1456
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001457 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001458
1459 res = br_tail(h2c->mbuf);
1460 retry:
1461 if (!h2_get_buf(h2c, res)) {
1462 h2c->flags |= H2_CF_MUX_MALLOC;
1463 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001464 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001465 }
1466
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001467 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001468 if (unlikely(ret <= 0)) {
1469 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001470 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1471 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001472 h2c->flags |= H2_CF_MUX_MFULL;
1473 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001474 }
1475 else {
1476 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001477 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001478 }
1479 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001480 out:
1481 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001482 return ret;
1483}
1484
Willy Tarreau52eed752017-09-22 15:05:09 +02001485/* Try to receive a connection preface, then upon success try to send our
1486 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1487 * missing data. It may return an error in h2c.
1488 */
1489static int h2c_frt_recv_preface(struct h2c *h2c)
1490{
1491 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001492 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001493
Willy Tarreau7838a792019-08-12 18:42:03 +02001494 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1495
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001496 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001497
1498 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001499 if (ret1 < 0)
1500 sess_log(h2c->conn->owner);
1501
Willy Tarreau52eed752017-09-22 15:05:09 +02001502 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn))
1503 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001504 ret2 = 0;
1505 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001506 }
1507
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001508 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001509 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001510 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001511 out:
1512 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001513 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001514}
1515
Willy Tarreau01b44822018-10-03 14:26:37 +02001516/* Try to send a connection preface, then upon success try to send our
1517 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1518 * missing data. It may return an error in h2c.
1519 */
1520static int h2c_bck_send_preface(struct h2c *h2c)
1521{
1522 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001523 int ret = 0;
1524
1525 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001526
1527 if (h2c_mux_busy(h2c, NULL)) {
1528 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001529 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001530 }
1531
Willy Tarreaubcc45952019-05-26 10:05:50 +02001532 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001533 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001534 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001535 h2c->flags |= H2_CF_MUX_MALLOC;
1536 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001537 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001538 }
1539
1540 if (!b_data(res)) {
1541 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001542 ret = b_istput(res, ist(H2_CONN_PREFACE));
1543 if (unlikely(ret <= 0)) {
1544 if (!ret) {
1545 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1546 goto retry;
1547 h2c->flags |= H2_CF_MUX_MFULL;
1548 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001549 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001550 }
1551 else {
1552 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001553 ret = 0;
1554 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001555 }
1556 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001557 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001558 ret = h2c_send_settings(h2c);
1559 out:
1560 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1561 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001562}
1563
Willy Tarreau081d4722017-05-16 21:51:05 +02001564/* try to send a GOAWAY frame on the connection to report an error or a graceful
1565 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1566 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1567 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1568 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1569 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1570 * on unrecoverable failure. It will not attempt to send one again in this last
1571 * case so that it is safe to use h2c_error() to report such errors.
1572 */
1573static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1574{
1575 struct buffer *res;
1576 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001577 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001578
Willy Tarreau7838a792019-08-12 18:42:03 +02001579 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1580
1581 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1582 ret = 1; // claim that it worked
1583 goto out;
1584 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001585
1586 if (h2c_mux_busy(h2c, h2s)) {
1587 if (h2s)
1588 h2s->flags |= H2_SF_BLK_MBUSY;
1589 else
1590 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001591 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001592 }
1593
Willy Tarreau9c218e72019-05-26 10:08:28 +02001594 /* len: 8, type: 7, flags: none, sid: 0 */
1595 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1596
1597 if (h2c->last_sid < 0)
1598 h2c->last_sid = h2c->max_id;
1599
1600 write_n32(str + 9, h2c->last_sid);
1601 write_n32(str + 13, h2c->errcode);
1602
Willy Tarreaubcc45952019-05-26 10:05:50 +02001603 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001604 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001605 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001606 h2c->flags |= H2_CF_MUX_MALLOC;
1607 if (h2s)
1608 h2s->flags |= H2_SF_BLK_MROOM;
1609 else
1610 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001611 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001612 }
1613
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001614 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001615 if (unlikely(ret <= 0)) {
1616 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001617 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1618 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001619 h2c->flags |= H2_CF_MUX_MFULL;
1620 if (h2s)
1621 h2s->flags |= H2_SF_BLK_MROOM;
1622 else
1623 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001624 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001625 }
1626 else {
1627 /* we cannot report this error using GOAWAY, so we mark
1628 * it and claim a success.
1629 */
1630 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1631 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001632 ret = 1;
1633 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001634 }
1635 }
1636 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02001637 out:
1638 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001639 return ret;
1640}
1641
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001642/* Try to send an RST_STREAM frame on the connection for the indicated stream
1643 * during mux operations. This stream must be valid and cannot be closed
1644 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1645 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1646 * not yet.
1647 *
1648 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1649 * to write the message, it subscribes the stream to future notifications.
1650 */
1651static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1652{
1653 struct buffer *res;
1654 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001655 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001656
Willy Tarreau7838a792019-08-12 18:42:03 +02001657 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1658
1659 if (!h2s || h2s->st == H2_SS_CLOSED) {
1660 ret = 1;
1661 goto out;
1662 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001663
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001664 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1665 * RST_STREAM in response to a RST_STREAM frame.
1666 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001667 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001668 ret = 1;
1669 goto ignore;
1670 }
1671
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001672 if (h2c_mux_busy(h2c, h2s)) {
1673 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001674 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001675 }
1676
Willy Tarreau9c218e72019-05-26 10:08:28 +02001677 /* len: 4, type: 3, flags: none */
1678 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1679 write_n32(str + 5, h2s->id);
1680 write_n32(str + 9, h2s->errcode);
1681
Willy Tarreaubcc45952019-05-26 10:05:50 +02001682 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001683 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001684 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001685 h2c->flags |= H2_CF_MUX_MALLOC;
1686 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001687 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001688 }
1689
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001690 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001691 if (unlikely(ret <= 0)) {
1692 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001693 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1694 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001695 h2c->flags |= H2_CF_MUX_MFULL;
1696 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001697 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001698 }
1699 else {
1700 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001701 ret = 0;
1702 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001703 }
1704 }
1705
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001706 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001707 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001708 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001709 out:
1710 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001711 return ret;
1712}
1713
1714/* Try to send an RST_STREAM frame on the connection for the stream being
1715 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001716 * error code, even if the stream is one of the dummy ones, and will update
1717 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001718 *
1719 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1720 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001721 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001722 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001723 */
1724static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1725{
1726 struct buffer *res;
1727 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001728 int ret = 0;
1729
1730 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001731
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001732 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1733 * RST_STREAM in response to a RST_STREAM frame.
1734 */
1735 if (h2c->dft == H2_FT_RST_STREAM) {
1736 ret = 1;
1737 goto ignore;
1738 }
1739
Willy Tarreau27a84c92017-10-17 08:10:17 +02001740 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001741 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001742 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001743 }
1744
Willy Tarreau9c218e72019-05-26 10:08:28 +02001745 /* len: 4, type: 3, flags: none */
1746 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1747
1748 write_n32(str + 5, h2c->dsi);
1749 write_n32(str + 9, h2s->errcode);
1750
Willy Tarreaubcc45952019-05-26 10:05:50 +02001751 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001752 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001753 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001754 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001755 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001756 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001757 }
1758
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001759 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001760 if (unlikely(ret <= 0)) {
1761 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001762 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1763 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001764 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001765 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001766 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001767 }
1768 else {
1769 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001770 ret = 0;
1771 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001772 }
1773 }
1774
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001775 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001776 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001777 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001778 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001779 }
1780
Willy Tarreau7838a792019-08-12 18:42:03 +02001781 out:
1782 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001783 return ret;
1784}
1785
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001786/* try to send an empty DATA frame with the ES flag set to notify about the
1787 * end of stream and match a shutdown(write). If an ES was already sent as
1788 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1789 * on success or zero if nothing was done. In case of lack of room to write the
1790 * message, it subscribes the requesting stream to future notifications.
1791 */
1792static int h2_send_empty_data_es(struct h2s *h2s)
1793{
1794 struct h2c *h2c = h2s->h2c;
1795 struct buffer *res;
1796 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001797 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001798
Willy Tarreau7838a792019-08-12 18:42:03 +02001799 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1800
1801 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1802 ret = 1;
1803 goto out;
1804 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001805
1806 if (h2c_mux_busy(h2c, h2s)) {
1807 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001808 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001809 }
1810
Willy Tarreau9c218e72019-05-26 10:08:28 +02001811 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1812 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1813 write_n32(str + 5, h2s->id);
1814
Willy Tarreaubcc45952019-05-26 10:05:50 +02001815 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001816 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001817 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001818 h2c->flags |= H2_CF_MUX_MALLOC;
1819 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001820 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001821 }
1822
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001823 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001824 if (likely(ret > 0)) {
1825 h2s->flags |= H2_SF_ES_SENT;
1826 }
1827 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001828 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1829 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001830 h2c->flags |= H2_CF_MUX_MFULL;
1831 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001832 }
1833 else {
1834 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001835 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001836 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001837 out:
1838 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001839 return ret;
1840}
1841
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001842/* wake a specific stream and assign its conn_stream som CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02001843 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001844 * is automatically updated accordingly. If the stream is orphaned, it is
1845 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01001846 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001847static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01001848{
Willy Tarreau7838a792019-08-12 18:42:03 +02001849 struct h2c *h2c = h2s->h2c;
1850
1851 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
1852
Christopher Fauletf02ca002019-03-07 16:21:34 +01001853 if (!h2s->cs) {
1854 /* this stream was already orphaned */
1855 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001856 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001857 return;
1858 }
1859
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001860 if (conn_xprt_read0_pending(h2s->h2c->conn)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001861 if (h2s->st == H2_SS_OPEN)
1862 h2s->st = H2_SS_HREM;
1863 else if (h2s->st == H2_SS_HLOC)
1864 h2s_close(h2s);
1865 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001866
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001867 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
1868 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
1869 h2s->cs->flags |= CS_FL_ERR_PENDING;
1870 if (h2s->cs->flags & CS_FL_EOS)
1871 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02001872
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001873 if (h2s->st < H2_SS_ERROR)
1874 h2s->st = H2_SS_ERROR;
1875 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01001876
1877 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001878 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001879}
1880
1881/* wake the streams attached to the connection, whose id is greater than <last>
1882 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001883 */
Willy Tarreau23482912019-05-07 15:23:14 +02001884static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001885{
1886 struct eb32_node *node;
1887 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001888
Willy Tarreau7838a792019-08-12 18:42:03 +02001889 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
1890
Christopher Fauletf02ca002019-03-07 16:21:34 +01001891 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001892 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
1893 while (node) {
1894 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001895 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001896 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001897 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01001898
Christopher Fauletf02ca002019-03-07 16:21:34 +01001899 /* Wake all streams with unassigned ID (ID == 0) */
1900 node = eb32_lookup(&h2c->streams_by_id, 0);
1901 while (node) {
1902 h2s = container_of(node, struct h2s, by_id);
1903 if (h2s->id > 0)
1904 break;
1905 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001906 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001907 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001908
1909 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001910}
1911
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001912/* Wake up all blocked streams whose window size has become positive after the
1913 * mux's initial window was adjusted. This should be done after having processed
1914 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001915 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001916static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001917{
1918 struct h2s *h2s;
1919 struct eb32_node *node;
1920
Willy Tarreau7838a792019-08-12 18:42:03 +02001921 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
1922
Willy Tarreau3421aba2017-07-27 15:41:03 +02001923 node = eb32_first(&h2c->streams_by_id);
1924 while (node) {
1925 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001926 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001927 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02001928 LIST_DEL_INIT(&h2s->list);
1929 if (h2s->send_wait)
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001930 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001931 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001932 node = eb32_next(node);
1933 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001934
1935 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001936}
1937
1938/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
1939 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01001940 * return an error in h2c. The caller must have already verified frame length
1941 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001942 */
1943static int h2c_handle_settings(struct h2c *h2c)
1944{
1945 unsigned int offset;
1946 int error;
1947
Willy Tarreau7838a792019-08-12 18:42:03 +02001948 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
1949
Willy Tarreau3421aba2017-07-27 15:41:03 +02001950 if (h2c->dff & H2_F_SETTINGS_ACK) {
1951 if (h2c->dfl) {
1952 error = H2_ERR_FRAME_SIZE_ERROR;
1953 goto fail;
1954 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001955 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001956 }
1957
Willy Tarreau3421aba2017-07-27 15:41:03 +02001958 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001959 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02001960 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001961
1962 /* parse the frame */
1963 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001964 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
1965 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001966
1967 switch (type) {
1968 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
1969 /* we need to update all existing streams with the
1970 * difference from the previous iws.
1971 */
1972 if (arg < 0) { // RFC7540#6.5.2
1973 error = H2_ERR_FLOW_CONTROL_ERROR;
1974 goto fail;
1975 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001976 h2c->miw = arg;
1977 break;
1978 case H2_SETTINGS_MAX_FRAME_SIZE:
1979 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
1980 error = H2_ERR_PROTOCOL_ERROR;
1981 goto fail;
1982 }
1983 h2c->mfs = arg;
1984 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01001985 case H2_SETTINGS_ENABLE_PUSH:
1986 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
1987 error = H2_ERR_PROTOCOL_ERROR;
1988 goto fail;
1989 }
1990 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01001991 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
1992 if (h2c->flags & H2_CF_IS_BACK) {
1993 /* the limit is only for the backend; for the frontend it is our limit */
1994 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
1995 arg = h2_settings_max_concurrent_streams;
1996 h2c->streams_limit = arg;
1997 }
1998 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001999 }
2000 }
2001
2002 /* need to ACK this frame now */
2003 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002004 done:
2005 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002006 return 1;
2007 fail:
Willy Tarreau22de8d32018-09-05 19:55:58 +02002008 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002009 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002010 out0:
2011 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 +02002012 return 0;
2013}
2014
2015/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2016 * success or one of the h2_status values.
2017 */
2018static int h2c_ack_settings(struct h2c *h2c)
2019{
2020 struct buffer *res;
2021 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002022 int ret = 0;
2023
2024 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002025
2026 if (h2c_mux_busy(h2c, NULL)) {
2027 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002028 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002029 }
2030
Willy Tarreau9c218e72019-05-26 10:08:28 +02002031 memcpy(str,
2032 "\x00\x00\x00" /* length : 0 (no data) */
2033 "\x04" "\x01" /* type : 4, flags : ACK */
2034 "\x00\x00\x00\x00" /* stream ID */, 9);
2035
Willy Tarreaubcc45952019-05-26 10:05:50 +02002036 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002037 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002038 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002039 h2c->flags |= H2_CF_MUX_MALLOC;
2040 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002041 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002042 }
2043
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002044 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002045 if (unlikely(ret <= 0)) {
2046 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002047 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2048 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002049 h2c->flags |= H2_CF_MUX_MFULL;
2050 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002051 }
2052 else {
2053 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002054 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002055 }
2056 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002057 out:
2058 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002059 return ret;
2060}
2061
Willy Tarreaucf68c782017-10-10 17:11:41 +02002062/* processes a PING frame and schedules an ACK if needed. The caller must pass
2063 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002064 * missing data. The caller must have already verified frame length
2065 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002066 */
2067static int h2c_handle_ping(struct h2c *h2c)
2068{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002069 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002070 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002071 h2c->st0 = H2_CS_FRAME_A;
2072 return 1;
2073}
2074
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002075/* Try to send a window update for stream id <sid> and value <increment>.
2076 * Returns > 0 on success or zero on missing room or failure. It may return an
2077 * error in h2c.
2078 */
2079static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2080{
2081 struct buffer *res;
2082 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002083 int ret = 0;
2084
2085 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002086
2087 if (h2c_mux_busy(h2c, NULL)) {
2088 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002089 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002090 }
2091
Willy Tarreau9c218e72019-05-26 10:08:28 +02002092 /* length: 4, type: 8, flags: none */
2093 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2094 write_n32(str + 5, sid);
2095 write_n32(str + 9, increment);
2096
Willy Tarreaubcc45952019-05-26 10:05:50 +02002097 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002098 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002099 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002100 h2c->flags |= H2_CF_MUX_MALLOC;
2101 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002102 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002103 }
2104
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002105 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002106 if (unlikely(ret <= 0)) {
2107 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002108 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2109 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002110 h2c->flags |= H2_CF_MUX_MFULL;
2111 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002112 }
2113 else {
2114 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002115 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002116 }
2117 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002118 out:
2119 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002120 return ret;
2121}
2122
2123/* try to send pending window update for the connection. It's safe to call it
2124 * with no pending updates. Returns > 0 on success or zero on missing room or
2125 * failure. It may return an error in h2c.
2126 */
2127static int h2c_send_conn_wu(struct h2c *h2c)
2128{
2129 int ret = 1;
2130
Willy Tarreau7838a792019-08-12 18:42:03 +02002131 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2132
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002133 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002134 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002135
Willy Tarreau97aaa672018-12-23 09:49:04 +01002136 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2137 /* increase the advertised connection window to 2G on
2138 * first update.
2139 */
2140 h2c->flags |= H2_CF_WINDOW_OPENED;
2141 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2142 }
2143
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002144 /* send WU for the connection */
2145 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2146 if (ret > 0)
2147 h2c->rcvd_c = 0;
2148
Willy Tarreau7838a792019-08-12 18:42:03 +02002149 out:
2150 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002151 return ret;
2152}
2153
2154/* try to send pending window update for the current dmux stream. It's safe to
2155 * call it with no pending updates. Returns > 0 on success or zero on missing
2156 * room or failure. It may return an error in h2c.
2157 */
2158static int h2c_send_strm_wu(struct h2c *h2c)
2159{
2160 int ret = 1;
2161
Willy Tarreau7838a792019-08-12 18:42:03 +02002162 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2163
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002164 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002165 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002166
2167 /* send WU for the stream */
2168 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2169 if (ret > 0)
2170 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002171 out:
2172 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002173 return ret;
2174}
2175
Willy Tarreaucf68c782017-10-10 17:11:41 +02002176/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2177 * success, 0 on missing data or one of the h2_status values.
2178 */
2179static int h2c_ack_ping(struct h2c *h2c)
2180{
2181 struct buffer *res;
2182 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002183 int ret = 0;
2184
2185 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002186
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002187 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002188 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002189
2190 if (h2c_mux_busy(h2c, NULL)) {
2191 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002192 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002193 }
2194
Willy Tarreaucf68c782017-10-10 17:11:41 +02002195 memcpy(str,
2196 "\x00\x00\x08" /* length : 8 (same payload) */
2197 "\x06" "\x01" /* type : 6, flags : ACK */
2198 "\x00\x00\x00\x00" /* stream ID */, 9);
2199
2200 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002201 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002202
Willy Tarreau9c218e72019-05-26 10:08:28 +02002203 res = br_tail(h2c->mbuf);
2204 retry:
2205 if (!h2_get_buf(h2c, res)) {
2206 h2c->flags |= H2_CF_MUX_MALLOC;
2207 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002208 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002209 }
2210
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002211 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002212 if (unlikely(ret <= 0)) {
2213 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002214 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2215 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002216 h2c->flags |= H2_CF_MUX_MFULL;
2217 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002218 }
2219 else {
2220 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002221 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002222 }
2223 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002224 out:
2225 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002226 return ret;
2227}
2228
Willy Tarreau26f95952017-07-27 17:18:30 +02002229/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2230 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002231 * h2c or h2s. The caller must have already verified frame length and stream ID
2232 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002233 */
2234static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2235{
2236 int32_t inc;
2237 int error;
2238
Willy Tarreau7838a792019-08-12 18:42:03 +02002239 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2240
Willy Tarreau26f95952017-07-27 17:18:30 +02002241 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002242 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002243 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002244
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002245 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002246
2247 if (h2c->dsi != 0) {
2248 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002249
2250 /* it's not an error to receive WU on a closed stream */
2251 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002252 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002253
2254 if (!inc) {
2255 error = H2_ERR_PROTOCOL_ERROR;
2256 goto strm_err;
2257 }
2258
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002259 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002260 error = H2_ERR_FLOW_CONTROL_ERROR;
2261 goto strm_err;
2262 }
2263
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002264 h2s->sws += inc;
2265 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002266 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002267 LIST_DEL_INIT(&h2s->list);
2268 if (h2s->send_wait)
Olivier Houcharddddfe312018-10-10 18:51:00 +02002269 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002270 }
2271 }
2272 else {
2273 /* connection window update */
2274 if (!inc) {
2275 error = H2_ERR_PROTOCOL_ERROR;
2276 goto conn_err;
2277 }
2278
2279 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2280 error = H2_ERR_FLOW_CONTROL_ERROR;
2281 goto conn_err;
2282 }
2283
2284 h2c->mws += inc;
2285 }
2286
Willy Tarreau7838a792019-08-12 18:42:03 +02002287 done:
2288 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002289 return 1;
2290
2291 conn_err:
2292 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002293 out0:
2294 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 +02002295 return 0;
2296
2297 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002298 h2s_error(h2s, error);
2299 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002300 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002301 return 0;
2302}
2303
Willy Tarreaue96b0922017-10-30 00:28:29 +01002304/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002305 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2306 * have already verified frame length and stream ID validity. Described in
2307 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002308 */
2309static int h2c_handle_goaway(struct h2c *h2c)
2310{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002311 int last;
2312
Willy Tarreau7838a792019-08-12 18:42:03 +02002313 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002314 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002315 if (b_data(&h2c->dbuf) < h2c->dfl) {
2316 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002317 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002318 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002319
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002320 last = h2_get_n32(&h2c->dbuf, 0);
2321 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002322 if (h2c->last_sid < 0)
2323 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002324 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002325 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002326 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002327}
2328
Willy Tarreau92153fc2017-12-03 19:46:19 +01002329/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002330 * invalid. Returns > 0 on success or zero on missing data. It may return an
2331 * error in h2c. The caller must have already verified frame length and stream
2332 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002333 */
2334static int h2c_handle_priority(struct h2c *h2c)
2335{
Willy Tarreau7838a792019-08-12 18:42:03 +02002336 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2337
Willy Tarreau92153fc2017-12-03 19:46:19 +01002338 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002339 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002340 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002341 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002342 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002343
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002344 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002345 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01002346 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002347 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002348 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002349 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002350 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002351 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002352}
2353
Willy Tarreaucd234e92017-08-18 10:59:39 +02002354/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002355 * Returns > 0 on success or zero on missing data. The caller must have already
2356 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002357 */
2358static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2359{
Willy Tarreau7838a792019-08-12 18:42:03 +02002360 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2361
Willy Tarreaucd234e92017-08-18 10:59:39 +02002362 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002363 if (b_data(&h2c->dbuf) < h2c->dfl) {
2364 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 +02002365 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002366 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002367
2368 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002369 if (h2s->st == H2_SS_CLOSED) {
2370 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 +02002371 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002372 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002373
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002374 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002375 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002376
2377 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002378 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002379 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002380 }
2381
2382 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002383 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002384 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002385}
2386
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002387/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2388 * It may return an error in h2c or h2s. The caller must consider that the
2389 * return value is the new h2s in case one was allocated (most common case).
2390 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002391 * errors here are reported as connection errors since it's impossible to
2392 * recover from such errors after the compression context has been altered.
2393 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002394static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002395{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002396 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002397 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002398 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002399 int error;
2400
Willy Tarreau7838a792019-08-12 18:42:03 +02002401 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2402
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002403 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002404 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002405
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002406 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002407 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002408
2409 /* now either the frame is complete or the buffer is complete */
2410 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002411 /* The stream exists/existed, this must be a trailers frame */
2412 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002413 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2414 /* unrecoverable error ? */
2415 if (h2c->st0 >= H2_CS_ERROR)
2416 goto out;
2417
2418 if (error == 0)
2419 goto out; // missing data
2420
2421 if (error < 0) {
2422 /* Failed to decode this frame (e.g. too large request)
2423 * but the HPACK decompressor is still synchronized.
2424 */
2425 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2426 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002427 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002428 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002429 goto done;
2430 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002431 /* the connection was already killed by an RST, let's consume
2432 * the data and send another RST.
2433 */
2434 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2435 h2s = (struct h2s*)h2_error_stream;
2436 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002437 }
2438 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2439 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2440 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002441 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002442 goto conn_err;
2443 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002444 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2445 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002446
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002447 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002448
Willy Tarreau25919232019-01-03 14:48:18 +01002449 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002450 if (h2c->st0 >= H2_CS_ERROR)
2451 goto out;
2452
Willy Tarreau25919232019-01-03 14:48:18 +01002453 if (error <= 0) {
2454 if (error == 0)
2455 goto out; // missing data
2456
2457 /* Failed to decode this stream (e.g. too large request)
2458 * but the HPACK decompressor is still synchronized.
2459 */
2460 h2s = (struct h2s*)h2_error_stream;
2461 goto send_rst;
2462 }
2463
Willy Tarreau22de8d32018-09-05 19:55:58 +02002464 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002465 * positively from h2c_frt_stream_new(), the stream will report the error,
2466 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002467 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002468 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002469 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002470 h2s = (struct h2s*)h2_refused_stream;
2471 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002472 }
2473
2474 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002475 h2s->rxbuf = rxbuf;
2476 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002477 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002478
Willy Tarreau88d138e2019-01-02 19:38:14 +01002479 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002480 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002481 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002482
2483 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002484 if (h2s->st == H2_SS_OPEN)
2485 h2s->st = H2_SS_HREM;
2486 else
2487 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002488 }
2489
Willy Tarreau3a429f02019-01-03 11:41:50 +01002490 /* update the max stream ID if the request is being processed */
2491 if (h2s->id > h2c->max_id)
2492 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002493
Willy Tarreau8fecec22019-08-30 07:29:53 +02002494 TRACE_USER("rcvd H2 request ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW, h2c->conn,, &rxbuf);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002495 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002496
2497 conn_err:
2498 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002499 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002500
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002501 out:
2502 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002503 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 +01002504 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002505
2506 send_rst:
2507 /* make the demux send an RST for the current stream. We may only
2508 * do this if we're certain that the HEADERS frame was properly
2509 * decompressed so that the HPACK decoder is still kept up to date.
2510 */
2511 h2_release_buf(h2c, &rxbuf);
2512 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002513
2514 TRACE_USER("rejected H2 request", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn,, &rxbuf);
2515 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002516 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002517}
2518
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002519/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2520 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2521 * errors here are reported as connection errors since it's impossible to
2522 * recover from such errors after the compression context has been altered.
2523 */
2524static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2525{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002526 struct buffer rxbuf = BUF_NULL;
2527 unsigned long long body_len = 0;
2528 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002529 int error;
2530
Willy Tarreau7838a792019-08-12 18:42:03 +02002531 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2532
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002533 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002534 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002535
2536 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002537 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002538
Christopher Faulet6884aa32019-09-23 15:28:20 +02002539 if (h2s->st != H2_SS_CLOSED) {
2540 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2541 }
2542 else {
2543 /* the connection was already killed by an RST, let's consume
2544 * the data and send another RST.
2545 */
2546 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002547 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002548 h2c->st0 = H2_CS_FRAME_E;
2549 goto send_rst;
2550 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002551
Willy Tarreau25919232019-01-03 14:48:18 +01002552 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002553 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002554 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002555
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002556 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2557 /* RFC7540#5.1 */
2558 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2559 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002560 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002561 }
2562
Willy Tarreau25919232019-01-03 14:48:18 +01002563 if (error <= 0) {
2564 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002565 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002566
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002567 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002568 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002569 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002570 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002571 }
2572
Christopher Fauletfa922f02019-05-07 10:55:17 +02002573 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002574 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002575
Willy Tarreau927b88b2019-03-04 08:03:25 +01002576 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002577 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002578 else if (h2s->flags & H2_SF_ES_RCVD) {
2579 if (h2s->st == H2_SS_OPEN)
2580 h2s->st = H2_SS_HREM;
2581 else if (h2s->st == H2_SS_HLOC)
2582 h2s_close(h2s);
2583 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002584
Willy Tarreau8fecec22019-08-30 07:29:53 +02002585 TRACE_USER("rcvd H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn,, &h2s->rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002586 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002587 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002588 fail:
2589 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2590 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002591
2592 send_rst:
2593 /* make the demux send an RST for the current stream. We may only
2594 * do this if we're certain that the HEADERS frame was properly
2595 * decompressed so that the HPACK decoder is still kept up to date.
2596 */
2597 h2_release_buf(h2c, &rxbuf);
2598 h2c->st0 = H2_CS_FRAME_E;
2599
2600 TRACE_USER("rejected H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn,, &rxbuf);
2601 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2602 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002603}
2604
Willy Tarreau454f9052017-10-26 19:40:35 +02002605/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2606 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2607 */
2608static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2609{
2610 int error;
2611
Willy Tarreau7838a792019-08-12 18:42:03 +02002612 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2613
Willy Tarreau454f9052017-10-26 19:40:35 +02002614 /* note that empty DATA frames are perfectly valid and sometimes used
2615 * to signal an end of stream (with the ES flag).
2616 */
2617
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002618 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002619 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002620
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002621 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002622 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002623
2624 /* now either the frame is complete or the buffer is complete */
2625
Willy Tarreau454f9052017-10-26 19:40:35 +02002626 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2627 /* RFC7540#6.1 */
2628 error = H2_ERR_STREAM_CLOSED;
2629 goto strm_err;
2630 }
2631
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002632 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002633 /* RFC7540#8.1.2 */
2634 error = H2_ERR_PROTOCOL_ERROR;
2635 goto strm_err;
2636 }
2637
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002638 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002639 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002640
Willy Tarreau454f9052017-10-26 19:40:35 +02002641 /* call the upper layers to process the frame, then let the upper layer
2642 * notify the stream about any change.
2643 */
2644 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002645 /* The upper layer has already closed, this may happen on
2646 * 4xx/redirects during POST, or when receiving a response
2647 * from an H2 server after the client has aborted.
2648 */
2649 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002650 goto strm_err;
2651 }
2652
Willy Tarreau8f650c32017-11-21 19:36:21 +01002653 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002654 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002655
Willy Tarreau721c9742017-11-07 11:05:42 +01002656 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002657 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002658 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002659 }
2660
2661 /* check for completion : the callee will change this to FRAME_A or
2662 * FRAME_H once done.
2663 */
2664 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002665 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002666
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002667 /* last frame */
2668 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002669 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002670 if (h2s->st == H2_SS_OPEN)
2671 h2s->st = H2_SS_HREM;
2672 else
2673 h2s_close(h2s);
2674
Willy Tarreau1915ca22019-01-24 11:49:37 +01002675 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2676 /* RFC7540#8.1.2 */
2677 error = H2_ERR_PROTOCOL_ERROR;
2678 goto strm_err;
2679 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002680 }
2681
Willy Tarreau7838a792019-08-12 18:42:03 +02002682 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002683 return 1;
2684
Willy Tarreau454f9052017-10-26 19:40:35 +02002685 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002686 h2s_error(h2s, error);
2687 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002688 fail:
2689 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 +02002690 return 0;
2691}
2692
Willy Tarreau63864812019-08-07 14:25:20 +02002693/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2694 * valid for the current stream state. This is needed only after parsing the
2695 * frame header but in practice it can be performed at any time during
2696 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2697 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2698 */
2699static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2700{
Willy Tarreau7838a792019-08-12 18:42:03 +02002701 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2702
Willy Tarreau63864812019-08-07 14:25:20 +02002703 if (h2s->st == H2_SS_IDLE &&
2704 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2705 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2706 * this state MUST be treated as a connection error
2707 */
2708 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2709 if (!h2c->nb_streams) {
2710 /* only log if no other stream can report the error */
2711 sess_log(h2c->conn->owner);
2712 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002713 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 +02002714 return 0;
2715 }
2716
2717 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2718 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2719 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2720 * this state MUST be treated as a stream error.
2721 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2722 * PUSH_PROMISE/CONTINUATION cause connection errors.
2723 */
2724 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)
2725 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2726 else
2727 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002728 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 +02002729 return 0;
2730 }
2731
2732 /* Below the management of frames received in closed state is a
2733 * bit hackish because the spec makes strong differences between
2734 * streams closed by receiving RST, sending RST, and seeing ES
2735 * in both directions. In addition to this, the creation of a
2736 * new stream reusing the identifier of a closed one will be
2737 * detected here. Given that we cannot keep track of all closed
2738 * streams forever, we consider that unknown closed streams were
2739 * closed on RST received, which allows us to respond with an
2740 * RST without breaking the connection (eg: to abort a transfer).
2741 * Some frames have to be silently ignored as well.
2742 */
2743 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
2744 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
2745 /* #5.1.1: The identifier of a newly
2746 * established stream MUST be numerically
2747 * greater than all streams that the initiating
2748 * endpoint has opened or reserved. This
2749 * governs streams that are opened using a
2750 * HEADERS frame and streams that are reserved
2751 * using PUSH_PROMISE. An endpoint that
2752 * receives an unexpected stream identifier
2753 * MUST respond with a connection error.
2754 */
2755 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002756 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 +02002757 return 0;
2758 }
2759
Willy Tarreau4c08f122019-09-26 08:47:15 +02002760 if (h2s->flags & H2_SF_RST_RCVD &&
2761 !(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 +02002762 /* RFC7540#5.1:closed: an endpoint that
2763 * receives any frame other than PRIORITY after
2764 * receiving a RST_STREAM MUST treat that as a
2765 * stream error of type STREAM_CLOSED.
2766 *
2767 * Note that old streams fall into this category
2768 * and will lead to an RST being sent.
2769 *
2770 * However, we cannot generalize this to all frame types. Those
2771 * carrying compression state must still be processed before
2772 * being dropped or we'll desynchronize the decoder. This can
2773 * happen with request trailers received after sending an
2774 * RST_STREAM, or with header/trailers responses received after
2775 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02002776 *
2777 * In addition, since our CLOSED streams always carry the
2778 * RST_RCVD bit, we don't want to accidently catch valid
2779 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02002780 */
2781 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2782 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002783 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 +02002784 return 0;
2785 }
2786
2787 /* RFC7540#5.1:closed: if this state is reached as a
2788 * result of sending a RST_STREAM frame, the peer that
2789 * receives the RST_STREAM might have already sent
2790 * frames on the stream that cannot be withdrawn. An
2791 * endpoint MUST ignore frames that it receives on
2792 * closed streams after it has sent a RST_STREAM
2793 * frame. An endpoint MAY choose to limit the period
2794 * over which it ignores frames and treat frames that
2795 * arrive after this time as being in error.
2796 */
2797 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
2798 /* RFC7540#5.1:closed: any frame other than
2799 * PRIO/WU/RST in this state MUST be treated as
2800 * a connection error
2801 */
2802 if (h2c->dft != H2_FT_RST_STREAM &&
2803 h2c->dft != H2_FT_PRIORITY &&
2804 h2c->dft != H2_FT_WINDOW_UPDATE) {
2805 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002806 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 +02002807 return 0;
2808 }
2809 }
2810 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002811 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02002812 return 1;
2813}
2814
Willy Tarreaubc933932017-10-09 16:21:43 +02002815/* process Rx frames to be demultiplexed */
2816static void h2_process_demux(struct h2c *h2c)
2817{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002818 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002819 struct h2_fh hdr;
2820 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002821 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02002822
Willy Tarreau7838a792019-08-12 18:42:03 +02002823 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2824
Willy Tarreau081d4722017-05-16 21:51:05 +02002825 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002826 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02002827
2828 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2829 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002830 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02002831 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02002832 goto out;
2833
Willy Tarreau52eed752017-09-22 15:05:09 +02002834 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
2835 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002836 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002837 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002838 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002839 sess_log(h2c->conn->owner);
2840 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002841 goto fail;
2842 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002843 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002844
2845 h2c->max_id = 0;
2846 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002847 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002848 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002849
2850 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002851 /* ensure that what is pending is a valid SETTINGS frame
2852 * without an ACK.
2853 */
Willy Tarreau7838a792019-08-12 18:42:03 +02002854 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 +02002855 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002856 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002857 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002858 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 +02002859 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002860 sess_log(h2c->conn->owner);
2861 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002862 goto fail;
2863 }
2864
2865 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
2866 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002867 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 +02002868 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2869 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002870 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002871 goto fail;
2872 }
2873
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002874 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002875 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002876 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 +02002877 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2878 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002879 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002880 goto fail;
2881 }
2882
Willy Tarreau3bf69182018-12-21 15:34:50 +01002883 /* that's OK, switch to FRAME_P to process it. This is
2884 * a SETTINGS frame whose header has already been
2885 * deleted above.
2886 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01002887 padlen = 0;
2888 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002889 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002890 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002891
2892 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02002893 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002894 int ret = 0;
2895
Willy Tarreau7838a792019-08-12 18:42:03 +02002896 if (!b_data(&h2c->dbuf)) {
2897 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
2898 break;
2899 }
2900
2901 if (h2c->st0 >= H2_CS_ERROR) {
2902 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002903 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02002904 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002905
2906 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02002907 h2c->rcvd_s = 0;
2908
Willy Tarreau7838a792019-08-12 18:42:03 +02002909 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01002910 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02002911 break;
2912
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002913 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002914 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 +02002915 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002916 if (!h2c->nb_streams) {
2917 /* only log if no other stream can report the error */
2918 sess_log(h2c->conn->owner);
2919 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002920 break;
2921 }
2922
Christopher Fauletdd2a5622019-06-18 12:22:38 +02002923 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002924 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
2925 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
2926 * we read the pad length and drop it from the remaining
2927 * payload (one byte + the 9 remaining ones = 10 total
2928 * removed), so we have a frame payload starting after the
2929 * pad len. Flow controlled frames (DATA) also count the
2930 * padlen in the flow control, so it must be adjusted.
2931 */
2932 if (hdr.len < 1) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002933 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 +01002934 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2935 sess_log(h2c->conn->owner);
2936 goto fail;
2937 }
2938 hdr.len--;
2939
2940 if (b_data(&h2c->dbuf) < 10)
2941 break; // missing padlen
2942
2943 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
2944
2945 if (padlen > hdr.len) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002946 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 +01002947 /* RFC7540#6.1 : pad length = length of
2948 * frame payload or greater => error.
2949 */
2950 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2951 sess_log(h2c->conn->owner);
2952 goto fail;
2953 }
2954
2955 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
2956 h2c->rcvd_c++;
2957 h2c->rcvd_s++;
2958 }
2959 b_del(&h2c->dbuf, 1);
2960 }
2961 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01002962
2963 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02002964 h2c->dfl = hdr.len;
2965 h2c->dsi = hdr.sid;
2966 h2c->dft = hdr.ft;
2967 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002968 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02002969 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 +02002970 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002971
2972 /* check for minimum basic frame format validity */
2973 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
2974 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002975 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 +01002976 h2c_error(h2c, ret);
2977 sess_log(h2c->conn->owner);
2978 goto fail;
2979 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002980 }
2981
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02002982 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
2983 * H2_CS_FRAME_P indicates an incomplete previous operation
2984 * (most often the first attempt) and requires some validity
2985 * checks for the frame and the current state. The two other
2986 * ones are set after completion (or abortion) and must skip
2987 * validity checks.
2988 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002989 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
2990
Willy Tarreau567beb82018-12-18 16:52:44 +01002991 if (tmp_h2s != h2s && h2s && h2s->cs &&
2992 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02002993 conn_xprt_read0_pending(h2c->conn) ||
2994 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02002995 (h2s->flags & H2_SF_ES_RCVD) ||
2996 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002997 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02002998 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 +01002999 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003000 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003001 }
3002 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003003
Willy Tarreau63864812019-08-07 14:25:20 +02003004 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003005 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3006 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003007 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003008 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003009
Willy Tarreau7e98c052017-10-10 15:56:59 +02003010 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003011 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003012 if (h2c->st0 == H2_CS_FRAME_P) {
3013 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003014 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003015 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003016
Willy Tarreau7838a792019-08-12 18:42:03 +02003017 if (h2c->st0 == H2_CS_FRAME_A) {
3018 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 +02003019 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003020 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003021 break;
3022
Willy Tarreaucf68c782017-10-10 17:11:41 +02003023 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003024 if (h2c->st0 == H2_CS_FRAME_P) {
3025 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003026 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003027 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003028
Willy Tarreau7838a792019-08-12 18:42:03 +02003029 if (h2c->st0 == H2_CS_FRAME_A) {
3030 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 +02003031 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003032 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003033 break;
3034
Willy Tarreau26f95952017-07-27 17:18:30 +02003035 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003036 if (h2c->st0 == H2_CS_FRAME_P) {
3037 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 +02003038 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003039 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003040 break;
3041
Willy Tarreau61290ec2017-10-17 08:19:21 +02003042 case H2_FT_CONTINUATION:
Willy Tarreauea18f862018-12-22 20:19:26 +01003043 /* RFC7540#6.10: CONTINUATION may only be preceeded by
3044 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3045 * frames' parsers consume all following CONTINUATION
3046 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003047 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003048 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 +01003049 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3050 sess_log(h2c->conn->owner);
3051 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003052
Willy Tarreau13278b42017-10-13 19:23:14 +02003053 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003054 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003055 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003056 if (h2c->flags & H2_CF_IS_BACK)
3057 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3058 else
3059 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003060 if (tmp_h2s) {
3061 h2s = tmp_h2s;
3062 ret = 1;
3063 }
3064 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003065 break;
3066
Willy Tarreau454f9052017-10-26 19:40:35 +02003067 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003068 if (h2c->st0 == H2_CS_FRAME_P) {
3069 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003070 ret = h2c_frt_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003071 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003072
Willy Tarreau7838a792019-08-12 18:42:03 +02003073 if (h2c->st0 == H2_CS_FRAME_A) {
3074 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 +02003075 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003076 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003077 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003078
Willy Tarreau92153fc2017-12-03 19:46:19 +01003079 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003080 if (h2c->st0 == H2_CS_FRAME_P) {
3081 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003082 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003083 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003084 break;
3085
Willy Tarreaucd234e92017-08-18 10:59:39 +02003086 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003087 if (h2c->st0 == H2_CS_FRAME_P) {
3088 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 +02003089 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003090 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02003091 break;
3092
Willy Tarreaue96b0922017-10-30 00:28:29 +01003093 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003094 if (h2c->st0 == H2_CS_FRAME_P) {
3095 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003096 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003097 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01003098 break;
3099
Willy Tarreau1c661982017-10-30 13:52:01 +01003100 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003101 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003102 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003103 /* drop frames that we ignore. They may be larger than
3104 * the buffer so we drain all of their contents until
3105 * we reach the end.
3106 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003107 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3108 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003109 h2c->dfl -= ret;
3110 ret = h2c->dfl == 0;
3111 }
3112
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003113 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003114 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003115 if (h2s->st == H2_SS_ERROR) {
3116 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 +01003117 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003118 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003119
Willy Tarreau7838a792019-08-12 18:42:03 +02003120 if (h2c->st0 == H2_CS_FRAME_E) {
3121 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 +01003122 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003123 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003124
Willy Tarreau7e98c052017-10-10 15:56:59 +02003125 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003126 if (ret <= 0) {
3127 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003128 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003129 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003130
3131 if (h2c->st0 != H2_CS_FRAME_H) {
Christopher Faulet5112a602019-09-26 16:38:28 +02003132 TRACE_DEVEL("stream error, skip frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
3133 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3134 b_del(&h2c->dbuf, ret);
3135 h2c->dfl -= ret;
3136 if (!h2c->dfl) {
3137 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3138 h2c->st0 = H2_CS_FRAME_H;
3139 h2c->dsi = -1;
3140 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003141 }
3142 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003143
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003144 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003145 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3146 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003147 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003148 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003149
Willy Tarreau52eed752017-09-22 15:05:09 +02003150 fail:
3151 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01003152 if (h2s && h2s->cs &&
3153 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003154 conn_xprt_read0_pending(h2c->conn) ||
3155 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003156 (h2s->flags & H2_SF_ES_RCVD) ||
3157 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003158 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003159 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 +01003160 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003161 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003162 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003163
Willy Tarreau7838a792019-08-12 18:42:03 +02003164 if (old_iw != h2c->miw) {
3165 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003166 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003167 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003168
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003169 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003170 out:
3171 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreaubc933932017-10-09 16:21:43 +02003172}
3173
3174/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3175 * the end.
3176 */
3177static int h2_process_mux(struct h2c *h2c)
3178{
Olivier Houchard998410a2019-04-15 19:23:37 +02003179 struct h2s *h2s, *h2s_back;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003180
Willy Tarreau7838a792019-08-12 18:42:03 +02003181 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3182
Willy Tarreau01b44822018-10-03 14:26:37 +02003183 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3184 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3185 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3186 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
3187 if (h2c->st0 == H2_CS_ERROR) {
3188 h2c->st0 = H2_CS_ERROR2;
3189 sess_log(h2c->conn->owner);
3190 }
3191 goto fail;
3192 }
3193 h2c->st0 = H2_CS_SETTINGS1;
3194 }
3195 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003196 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003197 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003198 }
3199
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003200 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003201 if (h2c->rcvd_s > 0 &&
3202 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3203 h2c_send_strm_wu(h2c) < 0)
3204 goto fail;
3205
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003206 if (h2c->rcvd_c > 0 &&
3207 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3208 h2c_send_conn_wu(h2c) < 0)
3209 goto fail;
3210
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003211 /* First we always process the flow control list because the streams
3212 * waiting there were already elected for immediate emission but were
3213 * blocked just on this.
3214 */
3215
Olivier Houchard998410a2019-04-15 19:23:37 +02003216 list_for_each_entry_safe(h2s, h2s_back, &h2c->fctl_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003217 if (h2c->mws <= 0 || h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3218 h2c->st0 >= H2_CS_ERROR)
3219 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02003220
Willy Tarreauc234ae32019-05-13 17:56:11 +02003221 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01003222 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003223
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003224 h2s->flags &= ~H2_SF_BLK_ANY;
Olivier Houchard998410a2019-04-15 19:23:37 +02003225 /* For some reason, the upper layer failed to subsribe again,
3226 * so remove it from the send_list
3227 */
3228 if (!h2s->send_wait) {
3229 LIST_DEL_INIT(&h2s->list);
3230 continue;
3231 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003232 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01003233 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003234 tasklet_wakeup(h2s->send_wait->tasklet);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003235 }
3236
Olivier Houchard998410a2019-04-15 19:23:37 +02003237 list_for_each_entry_safe(h2s, h2s_back, &h2c->send_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003238 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
3239 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02003240
Willy Tarreauc234ae32019-05-13 17:56:11 +02003241 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01003242 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003243
Olivier Houchard998410a2019-04-15 19:23:37 +02003244 /* For some reason, the upper layer failed to subsribe again,
3245 * so remove it from the send_list
3246 */
3247 if (!h2s->send_wait) {
3248 LIST_DEL_INIT(&h2s->list);
3249 continue;
3250 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003251 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003252 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01003253 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003254 tasklet_wakeup(h2s->send_wait->tasklet);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003255 }
3256
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003257 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003258 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003259 if (h2c->st0 == H2_CS_ERROR) {
3260 if (h2c->max_id >= 0) {
3261 h2c_send_goaway_error(h2c, NULL);
3262 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003263 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003264 }
3265
3266 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3267 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003268 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003269 done:
3270 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3271 return 1;
3272 out0:
3273 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3274 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003275}
3276
Willy Tarreau62f52692017-10-08 23:01:42 +02003277
Willy Tarreau479998a2018-11-18 06:30:59 +01003278/* Attempt to read data, and subscribe if none available.
3279 * The function returns 1 if data has been received, otherwise zero.
3280 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003281static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003282{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003283 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003284 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003285 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003286 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003287
Willy Tarreau7838a792019-08-12 18:42:03 +02003288 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3289
3290 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3291 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003292 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003293 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003294
Willy Tarreau7838a792019-08-12 18:42:03 +02003295 if (!h2_recv_allowed(h2c)) {
3296 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003297 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003298 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003299
Willy Tarreau44e973f2018-03-01 17:49:30 +01003300 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003301 if (!buf) {
3302 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003303 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003304 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003305 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003306
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003307 b_realign_if_empty(buf);
3308 if (!b_data(buf)) {
3309 /* try to pre-align the buffer like the
3310 * rxbufs will be to optimize memory copies. We'll make
3311 * sure that the frame header lands at the end of the
3312 * HTX block to alias it upon recv. We cannot use the
3313 * head because rcv_buf() will realign the buffer if
3314 * it's empty. Thus we cheat and pretend we already
3315 * have a few bytes there.
3316 */
3317 max = buf_room_for_htx_data(buf) + 9;
3318 buf->head = sizeof(struct htx) - 9;
3319 }
3320 else
3321 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003322
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003323 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003324
Willy Tarreau7838a792019-08-12 18:42:03 +02003325 if (max && !ret && h2_recv_allowed(h2c)) {
3326 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003327 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003328 } else if (ret)
3329 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn,,, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003330
Olivier Houcharda1411e62018-08-17 18:42:48 +02003331 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003332 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003333 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003334 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003335 }
3336
Willy Tarreau7838a792019-08-12 18:42:03 +02003337 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003338 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003339 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003340 }
3341
3342 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003343 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003344}
3345
Willy Tarreau479998a2018-11-18 06:30:59 +01003346/* Try to send data if possible.
3347 * The function returns 1 if data have been sent, otherwise zero.
3348 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003349static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003350{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003351 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003352 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003353 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003354
Willy Tarreau7838a792019-08-12 18:42:03 +02003355 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003356
Willy Tarreau7838a792019-08-12 18:42:03 +02003357 if (conn->flags & CO_FL_ERROR) {
3358 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3359 return 1;
3360 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003361
Willy Tarreaua2af5122017-10-09 11:56:46 +02003362 if (conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN)) {
3363 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003364 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003365 }
3366
Willy Tarreaubc933932017-10-09 16:21:43 +02003367 /* This loop is quite simple : it tries to fill as much as it can from
3368 * pending streams into the existing buffer until it's reportedly full
3369 * or the end of send requests is reached. Then it tries to send this
3370 * buffer's contents out, marks it not full if at least one byte could
3371 * be sent, and tries again.
3372 *
3373 * The snd_buf() function normally takes a "flags" argument which may
3374 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3375 * data immediately comes and CO_SFL_STREAMER to indicate that the
3376 * connection is streaming lots of data (used to increase TLS record
3377 * size at the expense of latency). The former can be sent any time
3378 * there's a buffer full flag, as it indicates at least one stream
3379 * attempted to send and failed so there are pending data. An
3380 * alternative would be to set it as long as there's an active stream
3381 * but that would be problematic for ACKs until we have an absolute
3382 * guarantee that all waiters have at least one byte to send. The
3383 * latter should possibly not be set for now.
3384 */
3385
3386 done = 0;
3387 while (!done) {
3388 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003389 unsigned int released = 0;
3390 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003391
3392 /* fill as much as we can into the current buffer */
3393 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3394 done = h2_process_mux(h2c);
3395
Olivier Houchard2b094432019-01-29 18:28:36 +01003396 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003397 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003398
Willy Tarreaubc933932017-10-09 16:21:43 +02003399 if (conn->flags & CO_FL_ERROR)
3400 break;
3401
3402 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3403 flags |= CO_SFL_MSG_MORE;
3404
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003405 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3406 if (b_data(buf)) {
3407 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003408 if (!ret) {
3409 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003410 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003411 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003412 sent = 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003413 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn,, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003414 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003415 if (b_data(buf)) {
3416 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003417 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003418 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003419 }
3420 b_free(buf);
3421 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003422 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003423
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003424 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003425 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003426
Willy Tarreaubc933932017-10-09 16:21:43 +02003427 /* wrote at least one byte, the buffer is not full anymore */
3428 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
3429 }
3430
Willy Tarreaua2af5122017-10-09 11:56:46 +02003431 if (conn->flags & CO_FL_SOCK_WR_SH) {
3432 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003433 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003434 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003435 /* We're not full anymore, so we can wake any task that are waiting
3436 * for us.
3437 */
Willy Tarreaucec60052019-09-25 07:57:31 +02003438 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H) {
Olivier Houchardd360ac62019-03-22 17:37:16 +01003439 struct h2s *h2s;
3440
3441 list_for_each_entry(h2s, &h2c->send_list, list) {
3442 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
3443 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02003444
Willy Tarreauc234ae32019-05-13 17:56:11 +02003445 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01003446 continue;
3447
Olivier Houchard998410a2019-04-15 19:23:37 +02003448 /* For some reason, the upper layer failed to subsribe again,
3449 * so remove it from the send_list
3450 */
3451 if (!h2s->send_wait) {
3452 LIST_DEL_INIT(&h2s->list);
3453 continue;
3454 }
Olivier Houchardd360ac62019-03-22 17:37:16 +01003455 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003456 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Willy Tarreau7838a792019-08-12 18:42:03 +02003457 TRACE_DEVEL("waking up pending stream", H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn, h2s);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003458 tasklet_wakeup(h2s->send_wait->tasklet);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003459 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02003460 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003461 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003462 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003463 if (!br_data(h2c->mbuf)) {
3464 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003465 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003466 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003467schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003468 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3469 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003470 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003471 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003472
Willy Tarreau7838a792019-08-12 18:42:03 +02003473 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003474 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003475}
3476
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003477/* this is the tasklet referenced in h2c->wait_event.tasklet */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003478static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
3479{
3480 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02003481 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003482
Willy Tarreau7838a792019-08-12 18:42:03 +02003483 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3484
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003485 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003486 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003487 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003488 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003489 if (ret || b_data(&h2c->dbuf))
Olivier Houchard7505f942018-08-21 18:10:44 +02003490 h2_process(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003491
3492 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003493 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003494}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003495
Willy Tarreau62f52692017-10-08 23:01:42 +02003496/* callback called on any event by the connection handler.
3497 * It applies changes and returns zero, or < 0 if it wants immediate
3498 * destruction of the connection (which normally doesn not happen in h2).
3499 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003500static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003501{
Olivier Houchard7505f942018-08-21 18:10:44 +02003502 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003503
Willy Tarreau7838a792019-08-12 18:42:03 +02003504 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3505
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003506 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003507 h2_process_demux(h2c);
3508
3509 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003510 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003511
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003512 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003513 h2c->flags &= ~H2_CF_DEM_DFULL;
3514 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003515 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003516
Willy Tarreau0b37d652018-10-03 10:33:02 +02003517 if (unlikely(h2c->proxy->state == PR_STSTOPPED)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003518 /* frontend is stopping, reload likely in progress, let's try
3519 * to announce a graceful shutdown if not yet done. We don't
3520 * care if it fails, it will be tried again later.
3521 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003522 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003523 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3524 if (h2c->last_sid < 0)
3525 h2c->last_sid = (1U << 31) - 1;
3526 h2c_send_goaway_error(h2c, NULL);
3527 }
3528 }
3529
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003530 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003531 * If we received early data, and the handshake is done, wake
3532 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003533 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003534 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
3535 (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_HANDSHAKE | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
3536 struct eb32_node *node;
3537 struct h2s *h2s;
3538
3539 h2c->flags |= H2_CF_WAIT_FOR_HS;
3540 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3541
3542 while (node) {
3543 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003544 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003545 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003546 node = eb32_next(node);
3547 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003548 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003549
Willy Tarreau26bd7612017-10-09 16:47:04 +02003550 if (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003551 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3552 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3553 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003554 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003555
3556 if (eb_is_empty(&h2c->streams_by_id)) {
3557 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003558 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003559 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003560 return -1;
3561 }
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003562 }
3563
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003564 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003565 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003566
Olivier Houchard53216e72018-10-10 15:46:36 +02003567 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3568 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3569 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003570 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003571 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3572 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003573 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003574
Willy Tarreau3f133572017-10-31 19:21:06 +01003575 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003576 if (h2c_may_expire(h2c))
3577 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3578 else
3579 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003580 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003581 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003582
Olivier Houchard7505f942018-08-21 18:10:44 +02003583 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003584 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003585 return 0;
3586}
3587
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003588/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003589static int h2_wake(struct connection *conn)
3590{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003591 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003592 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003593
Willy Tarreau7838a792019-08-12 18:42:03 +02003594 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3595 ret = h2_process(h2c);
3596 TRACE_LEAVE(H2_EV_H2C_WAKE);
3597 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003598}
3599
Willy Tarreauea392822017-10-31 10:02:25 +01003600/* Connection timeout management. The principle is that if there's no receipt
3601 * nor sending for a certain amount of time, the connection is closed. If the
3602 * MUX buffer still has lying data or is not allocatable, the connection is
3603 * immediately killed. If it's allocatable and empty, we attempt to send a
3604 * GOAWAY frame.
3605 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003606static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003607{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003608 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003609 int expired = tick_is_expired(t->expire, now_ms);
3610
Willy Tarreau7838a792019-08-12 18:42:03 +02003611 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3612
3613 if (!expired && h2c) {
3614 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreauea392822017-10-31 10:02:25 +01003615 return t;
Willy Tarreau7838a792019-08-12 18:42:03 +02003616 }
Willy Tarreauea392822017-10-31 10:02:25 +01003617
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003618 if (h2c && !h2c_may_expire(h2c)) {
3619 /* we do still have streams but all of them are idle, waiting
3620 * for the data layer, so we must not enforce the timeout here.
3621 */
3622 t->expire = TICK_ETERNITY;
3623 return t;
3624 }
3625
Olivier Houchard3f795f72019-04-17 22:51:06 +02003626 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003627
3628 if (!h2c) {
3629 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003630 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02003631 return NULL;
3632 }
3633
3634 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003635 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003636 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003637
Willy Tarreau662fafc2019-05-26 09:43:07 +02003638 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003639 /* don't even try to send a GOAWAY, the buffer is stuck */
3640 h2c->flags |= H2_CF_GOAWAY_FAILED;
3641 }
3642
3643 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003644 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003645 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3646 h2c->flags |= H2_CF_GOAWAY_FAILED;
3647
Willy Tarreau662fafc2019-05-26 09:43:07 +02003648 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003649 unsigned int released = 0;
3650 struct buffer *buf;
3651
3652 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3653 if (b_data(buf)) {
3654 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3655 if (!ret)
3656 break;
3657 b_del(buf, ret);
3658 if (b_data(buf))
3659 break;
3660 b_free(buf);
3661 released++;
3662 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003663 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003664
3665 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003666 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003667 }
Willy Tarreauea392822017-10-31 10:02:25 +01003668
Willy Tarreau0975f112018-03-29 15:22:59 +02003669 /* either we can release everything now or it will be done later once
3670 * the last stream closes.
3671 */
3672 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003673 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003674
Willy Tarreau7838a792019-08-12 18:42:03 +02003675 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01003676 return NULL;
3677}
3678
3679
Willy Tarreau62f52692017-10-08 23:01:42 +02003680/*******************************************/
3681/* functions below are used by the streams */
3682/*******************************************/
3683
3684/*
3685 * Attach a new stream to a connection
3686 * (Used for outgoing connections)
3687 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003688static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003689{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003690 struct conn_stream *cs;
3691 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003692 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003693
Willy Tarreau7838a792019-08-12 18:42:03 +02003694 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003695 cs = cs_new(conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003696 if (!cs) {
3697 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003698 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003699 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01003700 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003701 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003702 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003703 cs_free(cs);
3704 return NULL;
3705 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003706 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003707 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003708}
3709
Willy Tarreaufafd3982018-11-18 21:29:20 +01003710/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3711 * We have to scan because we may have some orphan streams. It might be
3712 * beneficial to scan backwards from the end to reduce the likeliness to find
3713 * orphans.
3714 */
3715static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3716{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003717 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003718 struct h2s *h2s;
3719 struct eb32_node *node;
3720
3721 node = eb32_first(&h2c->streams_by_id);
3722 while (node) {
3723 h2s = container_of(node, struct h2s, by_id);
3724 if (h2s->cs)
3725 return h2s->cs;
3726 node = eb32_next(node);
3727 }
3728 return NULL;
3729}
3730
Willy Tarreau62f52692017-10-08 23:01:42 +02003731/*
Olivier Houchard060ed432018-11-06 16:32:42 +01003732 * Destroy the mux and the associated connection, if it is no longer used
3733 */
Christopher Faulet73c12072019-04-08 11:23:22 +02003734static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01003735{
Christopher Faulet73c12072019-04-08 11:23:22 +02003736 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01003737
Willy Tarreau7838a792019-08-12 18:42:03 +02003738 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02003739 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02003740 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003741 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01003742}
3743
3744/*
Willy Tarreau62f52692017-10-08 23:01:42 +02003745 * Detach the stream from the connection and possibly release the connection.
3746 */
3747static void h2_detach(struct conn_stream *cs)
3748{
Willy Tarreau60935142017-10-16 18:11:19 +02003749 struct h2s *h2s = cs->ctx;
3750 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003751 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003752
Willy Tarreau7838a792019-08-12 18:42:03 +02003753 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
3754
Willy Tarreau60935142017-10-16 18:11:19 +02003755 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003756 if (!h2s) {
3757 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02003758 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003759 }
Willy Tarreau60935142017-10-16 18:11:19 +02003760
Olivier Houchard998410a2019-04-15 19:23:37 +02003761 /* The stream is about to die, so no need to attempt to run its task */
Willy Tarreauc234ae32019-05-13 17:56:11 +02003762 if (LIST_ADDED(&h2s->sending_list) &&
Olivier Houchard998410a2019-04-15 19:23:37 +02003763 h2s->send_wait != &h2s->wait_event) {
Willy Tarreau86eded62019-06-14 14:47:49 +02003764 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchard998410a2019-04-15 19:23:37 +02003765 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd9986ed2019-05-09 13:24:08 +02003766 /*
3767 * At this point, the stream_interface is supposed to have called
3768 * h2_unsubscribe(), so the only way there's still a
3769 * subscription that came from the stream_interface (as we
3770 * can subscribe ourself, in h2_do_shutw() and h2_do_shutr(),
3771 * without the stream_interface involved) is that we subscribed
3772 * for sending, we woke the tasklet up and removed the
3773 * SUB_RETRY_SEND flag, so the stream_interface would not
3774 * know it has to unsubscribe for send, but the tasklet hasn't
3775 * run yet. Make sure to handle that by explicitely setting
3776 * send_wait to NULL, as nothing else will do it for us.
3777 */
3778 h2s->send_wait = NULL;
Olivier Houchard998410a2019-04-15 19:23:37 +02003779 }
3780
Olivier Houchardf502aca2018-12-14 19:42:40 +01003781 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003782 h2c = h2s->h2c;
3783 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02003784 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01003785 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
3786 !h2_frt_has_too_many_cs(h2c)) {
3787 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02003788 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003789 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02003790 }
Willy Tarreau60935142017-10-16 18:11:19 +02003791
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003792 /* this stream may be blocked waiting for some data to leave (possibly
3793 * an ES or RST frame), so orphan it in this case.
3794 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02003795 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02003796 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003797 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) && (h2s->send_wait || h2s->recv_wait)) {
3798 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003799 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003800 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003801
Willy Tarreau45f752e2017-10-30 15:44:59 +01003802 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
3803 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
3804 /* unblock the connection if it was blocked on this
3805 * stream.
3806 */
3807 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
3808 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003809 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01003810 }
3811
Willy Tarreau71049cc2018-03-28 13:56:39 +02003812 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02003813
Christopher Faulet9b79a102019-07-15 11:22:56 +02003814 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003815 if (!(h2c->conn->flags &
3816 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
3817 if (!h2c->conn->owner) {
Olivier Houchardf502aca2018-12-14 19:42:40 +01003818 h2c->conn->owner = sess;
Olivier Houchard351411f2018-12-27 17:20:54 +01003819 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
3820 h2c->conn->owner = NULL;
3821 if (eb_is_empty(&h2c->streams_by_id)) {
3822 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn))
3823 /* The server doesn't want it, let's kill the connection right away */
3824 h2c->conn->mux->destroy(h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003825 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
Olivier Houchard351411f2018-12-27 17:20:54 +01003826 return;
3827 }
3828 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003829 }
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003830 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletb2d930e2019-09-26 16:15:10 +02003831 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003832 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
Willy Tarreaufe1c9082019-08-30 14:57:17 +02003833 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003834 return;
Christopher Fauletb2d930e2019-09-26 16:15:10 +02003835 }
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003836 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003837 /* Never ever allow to reuse a connection from a non-reuse backend */
3838 if ((h2c->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
3839 h2c->conn->flags |= CO_FL_PRIVATE;
Willy Tarreauc234ae32019-05-13 17:56:11 +02003840 if (!LIST_ADDED(&h2c->conn->list) && h2c->nb_streams < h2c->streams_limit) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003841 struct server *srv = objt_server(h2c->conn->target);
3842
3843 if (srv) {
3844 if (h2c->conn->flags & CO_FL_PRIVATE)
3845 LIST_ADD(&srv->priv_conns[tid], &h2c->conn->list);
3846 else
3847 LIST_ADD(&srv->idle_conns[tid], &h2c->conn->list);
3848 }
3849
3850 }
3851 }
3852 }
3853
Willy Tarreaue323f342018-03-28 13:51:45 +02003854 /* We don't want to close right now unless we're removing the
3855 * last stream, and either the connection is in error, or it
3856 * reached the ID already specified in a GOAWAY frame received
3857 * or sent (as seen by last_sid >= 0).
3858 */
Olivier Houchard7a977432019-03-21 15:47:13 +01003859 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02003860 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02003861 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02003862 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02003863 }
3864 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003865 if (h2c_may_expire(h2c))
3866 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3867 else
3868 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003869 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02003870 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02003871 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003872 else
3873 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003874}
3875
Willy Tarreau88bdba32019-05-13 18:17:53 +02003876/* Performs a synchronous or asynchronous shutr(). */
3877static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003878{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003879 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003880 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003881
Willy Tarreauf983d002019-05-14 10:40:21 +02003882 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003883 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003884
Willy Tarreau7838a792019-08-12 18:42:03 +02003885 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
3886
Willy Tarreau18059042019-01-31 19:12:48 +01003887 /* a connstream may require us to immediately kill the whole connection
3888 * for example because of a "tcp-request content reject" rule that is
3889 * normally used to limit abuse. In this case we schedule a goaway to
3890 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01003891 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003892 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003893 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003894 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01003895 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3896 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3897 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003898 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
3899 /* Nothing was never sent for this stream, so reset with
3900 * REFUSED_STREAM error to let the client retry the
3901 * request.
3902 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003903 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01003904 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3905 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02003906 else {
3907 /* a final response was already provided, we don't want this
3908 * stream anymore. This may happen when the server responds
3909 * before the end of an upload and closes quickly (redirect,
3910 * deny, ...)
3911 */
3912 h2s_error(h2s, H2_ERR_CANCEL);
3913 }
Willy Tarreau18059042019-01-31 19:12:48 +01003914
Willy Tarreau90c32322017-11-24 08:00:30 +01003915 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003916 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003917 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003918
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003919 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003920 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01003921 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003922 done:
3923 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02003924 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003925 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003926add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02003927 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003928 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003929 if (h2s->flags & H2_SF_BLK_MFCTL) {
3930 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
3931 h2s->send_wait = sw;
3932 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
3933 h2s->send_wait = sw;
3934 LIST_ADDQ(&h2c->send_list, &h2s->list);
3935 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003936 }
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003937 /* Let the handler know we want shutr */
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003938 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02003939 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003940 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02003941}
3942
Willy Tarreau88bdba32019-05-13 18:17:53 +02003943/* Performs a synchronous or asynchronous shutw(). */
3944static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003945{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003946 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003947 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003948
Willy Tarreaucfba9d62019-08-06 10:30:58 +02003949 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003950 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003951
Willy Tarreau7838a792019-08-12 18:42:03 +02003952 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
3953
Willy Tarreaucfba9d62019-08-06 10:30:58 +02003954 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01003955 /* we can cleanly close using an empty data frame only after headers */
3956
3957 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
3958 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003959 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01003960
3961 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01003962 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01003963 else
3964 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003965 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01003966 /* a connstream may require us to immediately kill the whole connection
3967 * for example because of a "tcp-request content reject" rule that is
3968 * normally used to limit abuse. In this case we schedule a goaway to
3969 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01003970 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003971 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003972 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003973 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01003974 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3975 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3976 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003977 else {
3978 /* Nothing was never sent for this stream, so reset with
3979 * REFUSED_STREAM error to let the client retry the
3980 * request.
3981 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003982 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01003983 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3984 }
Willy Tarreau18059042019-01-31 19:12:48 +01003985
Willy Tarreau90c32322017-11-24 08:00:30 +01003986 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003987 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003988 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003989
Willy Tarreau00dd0782018-03-01 16:31:34 +01003990 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003991 }
3992
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003993 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003994 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02003995
3996 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
3997
Willy Tarreau88bdba32019-05-13 18:17:53 +02003998 done:
3999 h2s->flags &= ~H2_SF_WANT_SHUTW;
4000 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004001
4002 add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02004003 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004004 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004005 if (h2s->flags & H2_SF_BLK_MFCTL) {
4006 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
4007 h2s->send_wait = sw;
4008 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
4009 h2s->send_wait = sw;
4010 LIST_ADDQ(&h2c->send_list, &h2s->list);
4011 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004012 }
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004013 /* let the handler know we want to shutw */
4014 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreau7838a792019-08-12 18:42:03 +02004015 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004016 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004017}
4018
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004019/* This is the tasklet referenced in h2s->wait_event.tasklet, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004020 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4021 * and prevented the last frame from being emitted.
4022 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004023static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
4024{
4025 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004026 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004027
Willy Tarreau7838a792019-08-12 18:42:03 +02004028 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4029
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004030 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004031 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004032 h2_do_shutw(h2s);
4033
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004034 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004035 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004036
Willy Tarreau88bdba32019-05-13 18:17:53 +02004037 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004038 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004039 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004040
Willy Tarreau88bdba32019-05-13 18:17:53 +02004041 if (!h2s->cs) {
4042 h2s_destroy(h2s);
4043 if (h2c_is_dead(h2c))
4044 h2_release(h2c);
4045 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004046 }
4047
Willy Tarreau7838a792019-08-12 18:42:03 +02004048 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004049 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004050}
4051
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004052/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004053static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4054{
4055 struct h2s *h2s = cs->ctx;
4056
Willy Tarreau7838a792019-08-12 18:42:03 +02004057 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004058 if (cs->flags & CS_FL_KILL_CONN)
4059 h2s->flags |= H2_SF_KILL_CONN;
4060
Willy Tarreau7838a792019-08-12 18:42:03 +02004061 if (mode)
4062 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004063
Willy Tarreau7838a792019-08-12 18:42:03 +02004064 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004065}
4066
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004067/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004068static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4069{
4070 struct h2s *h2s = cs->ctx;
4071
Willy Tarreau7838a792019-08-12 18:42:03 +02004072 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004073 if (cs->flags & CS_FL_KILL_CONN)
4074 h2s->flags |= H2_SF_KILL_CONN;
4075
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004076 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004077 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004078}
4079
Christopher Faulet9b79a102019-07-15 11:22:56 +02004080/* Decode the payload of a HEADERS frame and produce the HTX request or response
4081 * depending on the connection's side. Returns a positive value on success, a
4082 * negative value on failure, or 0 if it couldn't proceed. May report connection
4083 * errors in h2c->errcode if the frame is non-decodable and the connection
4084 * unrecoverable. In absence of connection error when a failure is reported, the
4085 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004086 *
4087 * The function may fold CONTINUATION frames into the initial HEADERS frame
4088 * by removing padding and next frame header, then moving the CONTINUATION
4089 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4090 * leaving a hole between the main frame and the beginning of the next one.
4091 * The possibly remaining incomplete or next frame at the end may be moved
4092 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4093 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4094 *
4095 * A buffer at the beginning of processing may look like this :
4096 *
4097 * ,---.---------.-----.--------------.--------------.------.---.
4098 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4099 * `---^---------^-----^--------------^--------------^------^---'
4100 * | | <-----> | |
4101 * area | dpl | wrap
4102 * |<--------------> |
4103 * | dfl |
4104 * |<-------------------------------------------------->|
4105 * head data
4106 *
4107 * Padding is automatically overwritten when folding, participating to the
4108 * hole size after dfl :
4109 *
4110 * ,---.------------------------.-----.--------------.------.---.
4111 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4112 * `---^------------------------^-----^--------------^------^---'
4113 * | | <-----> | |
4114 * area | hole | wrap
4115 * |<-----------------------> |
4116 * | dfl |
4117 * |<-------------------------------------------------->|
4118 * head data
4119 *
4120 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4121 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4122 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004123 *
4124 * The <flags> field must point to either the stream's flags or to a copy of it
4125 * so that the function can update the following flags :
4126 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004127 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004128 *
4129 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4130 * decoding, in order to detect if we're dealing with a headers or a trailers
4131 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004132 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01004133static 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 +02004134{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004135 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004136 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004137 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004138 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004139 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004140 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004141 int flen; // header frame len
4142 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004143 int ret = 0;
4144 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004145 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004146
Willy Tarreau7838a792019-08-12 18:42:03 +02004147 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4148
Willy Tarreauea18f862018-12-22 20:19:26 +01004149next_frame:
4150 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4151 goto leave; // incomplete input frame
4152
4153 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4154 * this case, we'll try to paste it immediately after the initial
4155 * HEADERS frame payload and kill any possible padding. The initial
4156 * frame's length will be increased to represent the concatenation
4157 * of the two frames. The next frame is read from position <tlen>
4158 * and written at position <flen> (minus padding if some is present).
4159 */
4160 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4161 struct h2_fh hdr;
4162 int clen; // CONTINUATION frame's payload length
4163
Willy Tarreau7838a792019-08-12 18:42:03 +02004164 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 +01004165 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4166 /* no more data, the buffer may be full, either due to
4167 * too large a frame or because of too large a hole that
4168 * we're going to compact at the end.
4169 */
4170 goto leave;
4171 }
4172
4173 if (hdr.ft != H2_FT_CONTINUATION) {
4174 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004175 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 +01004176 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4177 goto fail;
4178 }
4179
4180 if (hdr.sid != h2c->dsi) {
4181 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004182 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 +01004183 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4184 goto fail;
4185 }
4186
4187 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4188 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004189 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 +01004190 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4191 goto fail;
4192 }
4193
4194 /* detect when we must stop aggragating frames */
4195 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4196
4197 /* Take as much as we can of the CONTINUATION frame's payload */
4198 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4199 if (clen > hdr.len)
4200 clen = hdr.len;
4201
4202 /* Move the frame's payload over the padding, hole and frame
4203 * header. At least one of hole or dpl is null (see diagrams
4204 * above). The hole moves after the new aggragated frame.
4205 */
4206 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4207 h2c->dfl += clen - h2c->dpl;
4208 hole += h2c->dpl + 9;
4209 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004210 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 +01004211 goto next_frame;
4212 }
4213
4214 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004215
Willy Tarreau13278b42017-10-13 19:23:14 +02004216 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004217 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004218 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004219 copy = alloc_trash_chunk();
4220 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004221 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 +02004222 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4223 goto fail;
4224 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004225 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4226 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4227 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004228 }
4229
Willy Tarreau13278b42017-10-13 19:23:14 +02004230 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4231 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004232 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004233 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004234 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 +01004235 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004236 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004237 }
4238
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004239 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004240 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 +01004241 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4242 goto fail;
4243 }
4244
Willy Tarreau13278b42017-10-13 19:23:14 +02004245 hdrs += 5; // stream dep = 4, weight = 1
4246 flen -= 5;
4247 }
4248
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004249 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004250 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 +01004251 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004252 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004253 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004254
Willy Tarreau937f7602018-02-26 15:22:17 +01004255 /* we can't retry a failed decompression operation so we must be very
4256 * careful not to take any risks. In practice the output buffer is
4257 * always empty except maybe for trailers, in which case we simply have
4258 * to wait for the upper layer to finish consuming what is available.
4259 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004260 htx = htx_from_buf(rxbuf);
4261 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004262 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 +02004263 h2c->flags |= H2_CF_DEM_SFULL;
4264 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004265 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004266
Willy Tarreau25919232019-01-03 14:48:18 +01004267 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004268 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4269 sizeof(list)/sizeof(list[0]), tmp);
4270 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004271 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 +01004272 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4273 goto fail;
4274 }
4275
Willy Tarreau25919232019-01-03 14:48:18 +01004276 /* The PACK decompressor was updated, let's update the input buffer and
4277 * the parser's state to commit these changes and allow us to later
4278 * fail solely on the stream if needed.
4279 */
4280 b_del(&h2c->dbuf, h2c->dfl + hole);
4281 h2c->dfl = hole = 0;
4282 h2c->st0 = H2_CS_FRAME_H;
4283
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004284 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004285 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004286
Willy Tarreau88d138e2019-01-02 19:38:14 +01004287 if (*flags & H2_SF_HEADERS_RCVD)
4288 goto trailers;
4289
4290 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004291 if (h2c->flags & H2_CF_IS_BACK)
4292 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
4293 else
4294 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004295
4296 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004297 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004298 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 +01004299 goto fail;
4300 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004301
Willy Tarreau174b06a2018-04-25 18:13:58 +02004302 if (msgf & H2_MSGF_BODY) {
4303 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004304 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004305 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004306 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004307 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004308 }
4309
Willy Tarreau88d138e2019-01-02 19:38:14 +01004310 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004311 /* indicate that a HEADERS frame was received for this stream, except
4312 * for 1xx responses. For 1xx responses, another HEADERS frame is
4313 * expected.
4314 */
4315 if (!(msgf & H2_MSGF_RSP_1XX))
4316 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004317
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02004318 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004319 /* Mark the end of message using EOM */
Willy Tarreau7838a792019-08-12 18:42:03 +02004320 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
4321 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 +02004322 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004323 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004324 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004325
Willy Tarreau86277d42019-01-02 15:36:11 +01004326 /* success */
4327 ret = 1;
4328
Willy Tarreau68dd9852017-07-03 14:44:26 +02004329 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004330 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004331 * move the remaining data over it.
4332 */
4333 if (hole) {
4334 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4335 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4336 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4337 b_sub(&h2c->dbuf, hole);
4338 }
4339
Willy Tarreau97215ca2019-04-29 10:20:21 +02004340 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004341 /* too large frames */
4342 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004343 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004344 }
4345
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004346 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004347 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004348 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004349 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004350 return ret;
4351
Willy Tarreau68dd9852017-07-03 14:44:26 +02004352 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004353 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004354 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004355
4356 trailers:
4357 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004358 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4359 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004360 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 +01004361 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4362 goto fail;
4363 }
4364
Christopher Faulet9b79a102019-07-15 11:22:56 +02004365 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004366 if (h2_make_htx_trailers(list, htx) <= 0) {
4367 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 +02004368 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004369 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004370 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004371}
4372
Christopher Faulet9b79a102019-07-15 11:22:56 +02004373/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004374 * parser state is automatically updated. Returns > 0 if it could completely
4375 * send the current frame, 0 if it couldn't complete, in which case
4376 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4377 * DATA frame can return 0 as a valid result). Stream errors are reported in
4378 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4379 * have checked the frame header and ensured that the frame was complete or the
4380 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004381 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004382static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004383{
4384 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004385 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004386 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004387 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004388 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004389 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004390
Willy Tarreau7838a792019-08-12 18:42:03 +02004391 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4392
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004393 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004394
Olivier Houchard638b7992018-08-16 15:41:52 +02004395 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004396 if (!csbuf) {
4397 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004398 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 +01004399 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004400 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004401 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004402
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004403try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004404 flen = h2c->dfl - h2c->dpl;
4405 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004406 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004407
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004408 if (flen > b_data(&h2c->dbuf)) {
4409 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004410 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004411 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004412 }
4413
Christopher Faulet9b79a102019-07-15 11:22:56 +02004414 block = htx_free_data_space(htx);
4415 if (!block) {
4416 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004417 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 +02004418 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004419 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004420 if (flen > block)
4421 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004422
Christopher Faulet9b79a102019-07-15 11:22:56 +02004423 /* here, flen is the max we can copy into the output buffer */
4424 block = b_contig_data(&h2c->dbuf, 0);
4425 if (flen > block)
4426 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004427
Christopher Faulet9b79a102019-07-15 11:22:56 +02004428 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau7838a792019-08-12 18:42:03 +02004429 TRACE_DATA("move some data to h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s,, (void *)(long)sent);
Willy Tarreau454f9052017-10-26 19:40:35 +02004430
Christopher Faulet9b79a102019-07-15 11:22:56 +02004431 b_del(&h2c->dbuf, sent);
4432 h2c->dfl -= sent;
4433 h2c->rcvd_c += sent;
4434 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004435
Christopher Faulet9b79a102019-07-15 11:22:56 +02004436 if (h2s->flags & H2_SF_DATA_CLEN) {
4437 h2s->body_len -= sent;
4438 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004439 }
4440
Christopher Faulet9b79a102019-07-15 11:22:56 +02004441 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004442 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004443 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 +01004444 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004445 }
4446
Christopher Faulet9b79a102019-07-15 11:22:56 +02004447 goto try_again;
4448
Willy Tarreau4a28da12018-01-04 14:41:00 +01004449 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004450 /* here we're done with the frame, all the payload (except padding) was
4451 * transferred.
4452 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004453
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004454 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004455 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004456 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 +02004457 h2c->flags |= H2_CF_DEM_SFULL;
4458 goto fail;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004459 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004460 }
4461
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004462 h2c->rcvd_c += h2c->dpl;
4463 h2c->rcvd_s += h2c->dpl;
4464 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004465 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004466 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004467 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004468 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004469 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004470 if (htx)
4471 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004472 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004473 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004474}
4475
Willy Tarreau115e83b2018-12-01 19:17:53 +01004476/* Try to send a HEADERS frame matching HTX response present in HTX message
4477 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4478 * must check the stream's status to detect any error which might have happened
4479 * subsequently to a successful send. The htx blocks are automatically removed
4480 * from the message. The htx message is assumed to be valid since produced from
4481 * the internal code, hence it contains a start line, an optional series of
4482 * header blocks and an end of header, otherwise an invalid frame could be
4483 * emitted and the resulting htx message could be left in an inconsistent state.
4484 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004485static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004486{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004487 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004488 struct h2c *h2c = h2s->h2c;
4489 struct htx_blk *blk;
4490 struct htx_blk *blk_end;
4491 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004492 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004493 struct htx_sl *sl;
4494 enum htx_blk_type type;
4495 int es_now = 0;
4496 int ret = 0;
4497 int hdr;
4498 int idx;
4499
Willy Tarreau7838a792019-08-12 18:42:03 +02004500 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4501
Willy Tarreau115e83b2018-12-01 19:17:53 +01004502 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004503 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004504 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004505 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004506 return 0;
4507 }
4508
Willy Tarreau115e83b2018-12-01 19:17:53 +01004509 /* determine the first block which must not be deleted, blk_end may
4510 * be NULL if all blocks have to be deleted.
4511 */
4512 idx = htx_get_head(htx);
4513 blk_end = NULL;
4514 while (idx != -1) {
4515 type = htx_get_blk_type(htx_get_blk(htx, idx));
4516 idx = htx_get_next(htx, idx);
4517 if (type == HTX_BLK_EOH) {
4518 if (idx != -1)
4519 blk_end = htx_get_blk(htx, idx);
4520 break;
4521 }
4522 }
4523
4524 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004525 blk = htx_get_head_blk(htx);
4526 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_RES_SL);
4527 ALREADY_CHECKED(blk);
4528 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004529 h2s->status = sl->info.res.status;
Willy Tarreau7838a792019-08-12 18:42:03 +02004530 if (h2s->status < 100 || h2s->status > 999) {
4531 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 +01004532 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004533 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004534
4535 /* and the rest of the headers, that we dump starting at header 0 */
4536 hdr = 0;
4537
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004538 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004539 while ((idx = htx_get_next(htx, idx)) != -1) {
4540 blk = htx_get_blk(htx, idx);
4541 type = htx_get_blk_type(blk);
4542
4543 if (type == HTX_BLK_UNUSED)
4544 continue;
4545
4546 if (type != HTX_BLK_HDR)
4547 break;
4548
Willy Tarreau7838a792019-08-12 18:42:03 +02004549 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4550 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 +01004551 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004552 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004553
4554 list[hdr].n = htx_get_blk_name(htx, blk);
4555 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004556 hdr++;
4557 }
4558
4559 /* marker for end of headers */
4560 list[hdr].n = ist("");
4561
4562 if (h2s->status == 204 || h2s->status == 304) {
4563 /* no contents, claim c-len is present and set to zero */
4564 es_now = 1;
4565 }
4566
Willy Tarreau9c218e72019-05-26 10:08:28 +02004567 mbuf = br_tail(h2c->mbuf);
4568 retry:
4569 if (!h2_get_buf(h2c, mbuf)) {
4570 h2c->flags |= H2_CF_MUX_MALLOC;
4571 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004572 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 +02004573 return 0;
4574 }
4575
Willy Tarreau115e83b2018-12-01 19:17:53 +01004576 chunk_reset(&outbuf);
4577
4578 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004579 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4580 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004581 break;
4582 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004583 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004584 }
4585
4586 if (outbuf.size < 9)
4587 goto full;
4588
4589 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4590 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4591 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4592 outbuf.data = 9;
4593
4594 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004595 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004596 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004597 goto realign_again;
4598 goto full;
4599 }
4600
4601 /* encode all headers, stop at empty name */
4602 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4603 /* these ones do not exist in H2 and must be dropped. */
4604 if (isteq(list[hdr].n, ist("connection")) ||
4605 isteq(list[hdr].n, ist("proxy-connection")) ||
4606 isteq(list[hdr].n, ist("keep-alive")) ||
4607 isteq(list[hdr].n, ist("upgrade")) ||
4608 isteq(list[hdr].n, ist("transfer-encoding")))
4609 continue;
4610
Christopher Faulet86d144c2019-08-14 16:32:25 +02004611 /* Skip all pseudo-headers */
4612 if (*(list[hdr].n.ptr) == ':')
4613 continue;
4614
Willy Tarreau115e83b2018-12-01 19:17:53 +01004615 if (isteq(list[hdr].n, ist("")))
4616 break; // end
4617
4618 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4619 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004620 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004621 goto realign_again;
4622 goto full;
4623 }
4624 }
4625
Christopher Faulet0b465482019-02-19 15:14:23 +01004626 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004627 * FIXME: we should also set it when we know for sure that the
4628 * content-length is zero as well as on 204/304
4629 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004630 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4631 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004632 es_now = 1;
4633
Willy Tarreau927b88b2019-03-04 08:03:25 +01004634 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004635 es_now = 1;
4636
4637 /* update the frame's size */
4638 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4639
4640 if (es_now)
4641 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4642
4643 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02004644 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02004645 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004646
4647 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4648 * 1xx responses, another HEADERS frame is expected.
4649 */
4650 if (h2s->status >= 200 || h2s->status == 101)
4651 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004652
Willy Tarreau115e83b2018-12-01 19:17:53 +01004653 if (es_now) {
4654 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02004655 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 +01004656 if (h2s->st == H2_SS_OPEN)
4657 h2s->st = H2_SS_HLOC;
4658 else
4659 h2s_close(h2s);
4660 }
4661
4662 /* OK we could properly deliver the response */
4663
4664 /* remove all header blocks including the EOH and compute the
4665 * corresponding size.
4666 *
4667 * FIXME: We should remove everything when es_now is set.
4668 */
4669 ret = 0;
4670 idx = htx_get_head(htx);
4671 blk = htx_get_blk(htx, idx);
4672 while (blk != blk_end) {
4673 ret += htx_get_blksz(blk);
4674 blk = htx_remove_blk(htx, blk);
4675 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004676
Christopher Faulet316934d2019-05-15 14:22:48 +02004677 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4678 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004679 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004680 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004681 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004682 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004683 return ret;
4684 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004685 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4686 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004687 h2c->flags |= H2_CF_MUX_MFULL;
4688 h2s->flags |= H2_SF_BLK_MROOM;
4689 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004690 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 +01004691 goto end;
4692 fail:
4693 /* unparsable HTX messages, too large ones to be produced in the local
4694 * list etc go here (unrecoverable errors).
4695 */
4696 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4697 ret = 0;
4698 goto end;
4699}
4700
Willy Tarreau80739692018-10-05 11:35:57 +02004701/* Try to send a HEADERS frame matching HTX request present in HTX message
4702 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4703 * must check the stream's status to detect any error which might have happened
4704 * subsequently to a successful send. The htx blocks are automatically removed
4705 * from the message. The htx message is assumed to be valid since produced from
4706 * the internal code, hence it contains a start line, an optional series of
4707 * header blocks and an end of header, otherwise an invalid frame could be
4708 * emitted and the resulting htx message could be left in an inconsistent state.
4709 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004710static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02004711{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004712 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02004713 struct h2c *h2c = h2s->h2c;
4714 struct htx_blk *blk;
4715 struct htx_blk *blk_end;
4716 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004717 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02004718 struct htx_sl *sl;
Willy Tarreau053c1572019-02-01 16:13:59 +01004719 struct ist meth, path, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02004720 enum htx_blk_type type;
4721 int es_now = 0;
4722 int ret = 0;
4723 int hdr;
4724 int idx;
4725
Willy Tarreau7838a792019-08-12 18:42:03 +02004726 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4727
Willy Tarreau80739692018-10-05 11:35:57 +02004728 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004729 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004730 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004731 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004732 return 0;
4733 }
4734
Willy Tarreau80739692018-10-05 11:35:57 +02004735 /* determine the first block which must not be deleted, blk_end may
4736 * be NULL if all blocks have to be deleted.
4737 */
4738 idx = htx_get_head(htx);
4739 blk_end = NULL;
4740 while (idx != -1) {
4741 type = htx_get_blk_type(htx_get_blk(htx, idx));
4742 idx = htx_get_next(htx, idx);
4743 if (type == HTX_BLK_EOH) {
4744 if (idx != -1)
4745 blk_end = htx_get_blk(htx, idx);
4746 break;
4747 }
4748 }
4749
4750 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004751 blk = htx_get_head_blk(htx);
4752 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
4753 ALREADY_CHECKED(blk);
4754 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004755 meth = htx_sl_req_meth(sl);
4756 path = htx_sl_req_uri(sl);
4757
4758 /* and the rest of the headers, that we dump starting at header 0 */
4759 hdr = 0;
4760
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004761 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02004762 while ((idx = htx_get_next(htx, idx)) != -1) {
4763 blk = htx_get_blk(htx, idx);
4764 type = htx_get_blk_type(blk);
4765
4766 if (type == HTX_BLK_UNUSED)
4767 continue;
4768
4769 if (type != HTX_BLK_HDR)
4770 break;
4771
Willy Tarreau7838a792019-08-12 18:42:03 +02004772 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4773 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 +02004774 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004775 }
Willy Tarreau80739692018-10-05 11:35:57 +02004776
4777 list[hdr].n = htx_get_blk_name(htx, blk);
4778 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004779 hdr++;
4780 }
4781
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02004782 /* Now add the server name to a header (if requested) */
4783 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
4784 struct server *srv = objt_server(h2c->conn->target);
4785
4786 if (srv) {
4787 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
4788 list[hdr].v = ist(srv->id);
4789 hdr++;
4790 }
4791 }
4792
Willy Tarreau80739692018-10-05 11:35:57 +02004793 /* marker for end of headers */
4794 list[hdr].n = ist("");
4795
Willy Tarreau9c218e72019-05-26 10:08:28 +02004796 mbuf = br_tail(h2c->mbuf);
4797 retry:
4798 if (!h2_get_buf(h2c, mbuf)) {
4799 h2c->flags |= H2_CF_MUX_MALLOC;
4800 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004801 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 +02004802 return 0;
4803 }
4804
Willy Tarreau80739692018-10-05 11:35:57 +02004805 chunk_reset(&outbuf);
4806
4807 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004808 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4809 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004810 break;
4811 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004812 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02004813 }
4814
4815 if (outbuf.size < 9)
4816 goto full;
4817
4818 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4819 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4820 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4821 outbuf.data = 9;
4822
4823 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01004824 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004825 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004826 goto realign_again;
4827 goto full;
4828 }
4829
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004830 /* RFC7540 #8.3: the CONNECT method must have :
4831 * - :authority set to the URI part (host:port)
4832 * - :method set to CONNECT
4833 * - :scheme and :path omitted
4834 */
4835 if (sl->info.req.meth != HTTP_METH_CONNECT) {
4836 /* encode the scheme which is always "https" (or 0x86 for "http") */
Christopher Faulet3b44c542019-06-14 10:46:51 +02004837 struct ist scheme;
4838
4839 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
4840 scheme = ist("http");
4841 else
4842 scheme = ist("https");
4843
4844 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004845 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004846 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004847 goto realign_again;
4848 goto full;
4849 }
Willy Tarreau80739692018-10-05 11:35:57 +02004850
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004851 /* encode the path, which necessarily is the second one */
4852 if (!hpack_encode_path(&outbuf, path)) {
4853 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004854 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004855 goto realign_again;
4856 goto full;
4857 }
Willy Tarreau053c1572019-02-01 16:13:59 +01004858
4859 /* look for the Host header and place it in :authority */
4860 auth = ist2(NULL, 0);
4861 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4862 if (isteq(list[hdr].n, ist("")))
4863 break; // end
4864
4865 if (isteq(list[hdr].n, ist("host"))) {
4866 auth = list[hdr].v;
4867 break;
4868 }
4869 }
4870 }
4871 else {
4872 /* for CONNECT, :authority is taken from the path */
4873 auth = path;
4874 }
4875
4876 if (auth.ptr && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
4877 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004878 if (b_space_wraps(mbuf))
Willy Tarreau053c1572019-02-01 16:13:59 +01004879 goto realign_again;
4880 goto full;
Willy Tarreau80739692018-10-05 11:35:57 +02004881 }
4882
4883 /* encode all headers, stop at empty name */
4884 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4885 /* these ones do not exist in H2 and must be dropped. */
4886 if (isteq(list[hdr].n, ist("connection")) ||
Willy Tarreau053c1572019-02-01 16:13:59 +01004887 isteq(list[hdr].n, ist("host")) ||
Willy Tarreau80739692018-10-05 11:35:57 +02004888 isteq(list[hdr].n, ist("proxy-connection")) ||
4889 isteq(list[hdr].n, ist("keep-alive")) ||
4890 isteq(list[hdr].n, ist("upgrade")) ||
4891 isteq(list[hdr].n, ist("transfer-encoding")))
4892 continue;
4893
Christopher Faulet86d144c2019-08-14 16:32:25 +02004894 /* Skip all pseudo-headers */
4895 if (*(list[hdr].n.ptr) == ':')
4896 continue;
4897
Willy Tarreau80739692018-10-05 11:35:57 +02004898 if (isteq(list[hdr].n, ist("")))
4899 break; // end
4900
4901 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4902 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004903 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004904 goto realign_again;
4905 goto full;
4906 }
4907 }
4908
4909 /* we may need to add END_STREAM if we have no body :
4910 * - request already closed, or :
4911 * - no transfer-encoding, and :
4912 * - no content-length or content-length:0
4913 * Fixme: this doesn't take into account CONNECT requests.
4914 */
4915 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
4916 es_now = 1;
4917
4918 if (sl->flags & HTX_SL_F_BODYLESS)
4919 es_now = 1;
4920
Willy Tarreau927b88b2019-03-04 08:03:25 +01004921 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02004922 es_now = 1;
4923
4924 /* update the frame's size */
4925 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4926
4927 if (es_now)
4928 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4929
4930 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02004931 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02004932 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02004933 h2s->flags |= H2_SF_HEADERS_SENT;
4934 h2s->st = H2_SS_OPEN;
4935
Willy Tarreau80739692018-10-05 11:35:57 +02004936 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004937 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 +02004938 // trim any possibly pending data (eg: inconsistent content-length)
4939 h2s->flags |= H2_SF_ES_SENT;
4940 h2s->st = H2_SS_HLOC;
4941 }
4942
4943 /* remove all header blocks including the EOH and compute the
4944 * corresponding size.
4945 *
4946 * FIXME: We should remove everything when es_now is set.
4947 */
4948 ret = 0;
4949 idx = htx_get_head(htx);
4950 blk = htx_get_blk(htx, idx);
4951 while (blk != blk_end) {
4952 ret += htx_get_blksz(blk);
4953 blk = htx_remove_blk(htx, blk);
4954 }
4955
Christopher Faulet316934d2019-05-15 14:22:48 +02004956 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4957 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02004958 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004959 }
Willy Tarreau80739692018-10-05 11:35:57 +02004960
4961 end:
4962 return ret;
4963 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004964 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4965 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02004966 h2c->flags |= H2_CF_MUX_MFULL;
4967 h2s->flags |= H2_SF_BLK_MROOM;
4968 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004969 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 +02004970 goto end;
4971 fail:
4972 /* unparsable HTX messages, too large ones to be produced in the local
4973 * list etc go here (unrecoverable errors).
4974 */
4975 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4976 ret = 0;
4977 goto end;
4978}
4979
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004980/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01004981 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
4982 * caller must check the stream's status to detect any error which might have
4983 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02004984 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004985 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004986static size_t h2s_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004987{
4988 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004989 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004990 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004991 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004992 size_t total = 0;
4993 int es_now = 0;
4994 int bsize; /* htx block size */
4995 int fsize; /* h2 frame size */
4996 struct htx_blk *blk;
4997 enum htx_blk_type type;
4998 int idx;
4999
Willy Tarreau7838a792019-08-12 18:42:03 +02005000 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5001
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005002 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005003 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005004 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005005 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005006 goto end;
5007 }
5008
Willy Tarreau98de12a2018-12-12 07:03:00 +01005009 htx = htx_from_buf(buf);
5010
Christopher Faulet54b5e212019-06-04 10:08:28 +02005011 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
5012 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
5013 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005014 */
5015
5016 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005017 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005018 goto end;
5019
5020 idx = htx_get_head(htx);
5021 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02005022 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005023 bsize = htx_get_blksz(blk);
5024 fsize = bsize;
5025
Christopher Faulet54b5e212019-06-04 10:08:28 +02005026 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01005027 if (h2s->flags & H2_SF_ES_SENT) {
5028 /* ES already sent */
5029 htx_remove_blk(htx, blk);
5030 total++; // EOM counts as one byte
5031 count--;
5032 goto end;
5033 }
5034 }
5035 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005036 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005037
Willy Tarreau9c218e72019-05-26 10:08:28 +02005038 mbuf = br_tail(h2c->mbuf);
5039 retry:
5040 if (!h2_get_buf(h2c, mbuf)) {
5041 h2c->flags |= H2_CF_MUX_MALLOC;
5042 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005043 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 +02005044 goto end;
5045 }
5046
Willy Tarreau98de12a2018-12-12 07:03:00 +01005047 /* Perform some optimizations to reduce the number of buffer copies.
5048 * First, if the mux's buffer is empty and the htx area contains
5049 * exactly one data block of the same size as the requested count, and
5050 * this count fits within the frame size, the stream's window size, and
5051 * the connection's window size, then it's possible to simply swap the
5052 * caller's buffer with the mux's output buffer and adjust offsets and
5053 * length to match the entire DATA HTX block in the middle. In this
5054 * case we perform a true zero-copy operation from end-to-end. This is
5055 * the situation that happens all the time with large files. Second, if
5056 * this is not possible, but the mux's output buffer is empty, we still
5057 * have an opportunity to avoid the copy to the intermediary buffer, by
5058 * making the intermediary buffer's area point to the output buffer's
5059 * area. In this case we want to skip the HTX header to make sure that
5060 * copies remain aligned and that this operation remains possible all
5061 * the time. This goes for headers, data blocks and any data extracted
5062 * from the HTX blocks.
5063 */
5064 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005065 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005066 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005067 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005068
Willy Tarreaubcc45952019-05-26 10:05:50 +02005069 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005070 /* Too bad there are data left there. We're willing to memcpy/memmove
5071 * up to 1/4 of the buffer, which means that it's OK to copy a large
5072 * frame into a buffer containing few data if it needs to be realigned,
5073 * and that it's also OK to copy few data without realigning. Otherwise
5074 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005075 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005076 if (fsize + 9 <= b_room(mbuf) &&
5077 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005078 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5079 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 +01005080 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005081 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005082
Willy Tarreau9c218e72019-05-26 10:08:28 +02005083 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5084 goto retry;
5085
Willy Tarreau98de12a2018-12-12 07:03:00 +01005086 h2c->flags |= H2_CF_MUX_MFULL;
5087 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005088 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 +01005089 goto end;
5090 }
5091
5092 /* map an H2 frame to the HTX block so that we can put the
5093 * frame header there.
5094 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005095 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5096 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005097
5098 /* prepend an H2 DATA frame header just before the DATA block */
5099 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5100 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5101 h2_set_frame_size(outbuf.area, fsize);
5102
5103 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005104 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005105 h2c->mws -= fsize;
5106
5107 /* and exchange with our old area */
5108 buf->area = old_area;
5109 buf->data = buf->head = 0;
5110 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005111
5112 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 +01005113 goto end;
5114 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005115
Willy Tarreau98de12a2018-12-12 07:03:00 +01005116 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005117 /* for DATA and EOM we'll have to emit a frame, even if empty */
5118
5119 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005120 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5121 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005122 break;
5123 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005124 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005125 }
5126
5127 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005128 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5129 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005130 h2c->flags |= H2_CF_MUX_MFULL;
5131 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005132 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005133 goto end;
5134 }
5135
5136 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5137 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5138 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5139 outbuf.data = 9;
5140
5141 /* we have in <fsize> the exact number of bytes we need to copy from
5142 * the HTX buffer. We need to check this against the connection's and
5143 * the stream's send windows, and to ensure that this fits in the max
5144 * frame size and in the buffer's available space minus 9 bytes (for
5145 * the frame header). The connection's flow control is applied last so
5146 * that we can use a separate list of streams which are immediately
5147 * unblocked on window opening. Note: we don't implement padding.
5148 */
5149
5150 /* EOM is presented with bsize==1 but would lead to the emission of an
5151 * empty frame, thus we force it to zero here.
5152 */
5153 if (type == HTX_BLK_EOM)
5154 bsize = fsize = 0;
5155
5156 if (!fsize)
5157 goto send_empty;
5158
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005159 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005160 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005161 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005162 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005163 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005164 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 +01005165 goto end;
5166 }
5167
Willy Tarreauee573762018-12-04 15:25:57 +01005168 if (fsize > count)
5169 fsize = count;
5170
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005171 if (fsize > h2s_mws(h2s))
5172 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005173
5174 if (h2c->mfs && fsize > h2c->mfs)
5175 fsize = h2c->mfs; // >0
5176
5177 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005178 /* It doesn't fit at once. If it at least fits once split and
5179 * the amount of data to move is low, let's defragment the
5180 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005181 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005182 if (b_space_wraps(mbuf) &&
5183 (fsize + 9 <= b_room(mbuf)) &&
5184 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005185 goto realign_again;
5186 fsize = outbuf.size - 9;
5187
5188 if (fsize <= 0) {
5189 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005190 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5191 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005192 h2c->flags |= H2_CF_MUX_MFULL;
5193 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005194 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005195 goto end;
5196 }
5197 }
5198
5199 if (h2c->mws <= 0) {
5200 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005201 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 +01005202 goto end;
5203 }
5204
5205 if (fsize > h2c->mws)
5206 fsize = h2c->mws;
5207
5208 /* now let's copy this this into the output buffer */
5209 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005210 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005211 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005212 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005213
5214 send_empty:
5215 /* update the frame's size */
5216 h2_set_frame_size(outbuf.area, fsize);
5217
5218 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5219 * meeting EOM. We should optimize this later.
5220 */
5221 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005222 total++; // EOM counts as one byte
5223 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005224 es_now = 1;
5225 }
5226
5227 if (es_now)
5228 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5229
5230 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005231 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005232
5233 /* consume incoming HTX block, including EOM */
5234 total += fsize;
5235 if (fsize == bsize) {
5236 htx_remove_blk(htx, blk);
Willy Tarreau7838a792019-08-12 18:42:03 +02005237 if (fsize) {
5238 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 +01005239 goto new_frame;
Willy Tarreau7838a792019-08-12 18:42:03 +02005240 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005241 } else {
5242 /* we've truncated this block */
5243 htx_cut_data_blk(htx, blk, fsize);
5244 }
5245
5246 if (es_now) {
5247 if (h2s->st == H2_SS_OPEN)
5248 h2s->st = H2_SS_HLOC;
5249 else
5250 h2s_close(h2s);
5251
5252 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005253 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 +01005254 }
5255
5256 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005257 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005258 return total;
5259}
5260
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005261/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5262 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5263 * processed. The caller must check the stream's status to detect any error
5264 * which might have happened subsequently to a successful send. The htx blocks
5265 * are automatically removed from the message. The htx message is assumed to be
5266 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005267 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005268 * as a single frame. The ES flag is always set.
5269 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005270static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005271{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005272 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005273 struct h2c *h2c = h2s->h2c;
5274 struct htx_blk *blk;
5275 struct htx_blk *blk_end;
5276 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005277 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005278 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005279 int ret = 0;
5280 int hdr;
5281 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005282
Willy Tarreau7838a792019-08-12 18:42:03 +02005283 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5284
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005285 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005286 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005287 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005288 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005289 goto end;
5290 }
5291
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005292 /* determine the first block which must not be deleted, blk_end may
5293 * be NULL if all blocks have to be deleted. also get trailers.
5294 */
5295 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005296 blk_end = NULL;
5297
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005298 hdr = 0;
5299 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005300 blk = htx_get_blk(htx, idx);
5301 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005302 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005303 if (type == HTX_BLK_UNUSED)
5304 continue;
5305
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005306 if (type == HTX_BLK_EOT) {
5307 if (idx != -1)
5308 blk_end = blk;
5309 break;
5310 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005311 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005312 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005313
Willy Tarreau7838a792019-08-12 18:42:03 +02005314 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5315 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 +01005316 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005317 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005318
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005319 list[hdr].n = htx_get_blk_name(htx, blk);
5320 list[hdr].v = htx_get_blk_value(htx, blk);
5321 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005322 }
5323
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005324 /* marker for end of trailers */
5325 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005326
Willy Tarreau9c218e72019-05-26 10:08:28 +02005327 mbuf = br_tail(h2c->mbuf);
5328 retry:
5329 if (!h2_get_buf(h2c, mbuf)) {
5330 h2c->flags |= H2_CF_MUX_MALLOC;
5331 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005332 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 +02005333 goto end;
5334 }
5335
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005336 chunk_reset(&outbuf);
5337
5338 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005339 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5340 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005341 break;
5342 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005343 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005344 }
5345
5346 if (outbuf.size < 9)
5347 goto full;
5348
5349 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5350 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5351 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5352 outbuf.data = 9;
5353
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005354 /* encode all headers */
5355 for (idx = 0; idx < hdr; idx++) {
5356 /* these ones do not exist in H2 or must not appear in
5357 * trailers and must be dropped.
5358 */
5359 if (isteq(list[idx].n, ist("host")) ||
5360 isteq(list[idx].n, ist("content-length")) ||
5361 isteq(list[idx].n, ist("connection")) ||
5362 isteq(list[idx].n, ist("proxy-connection")) ||
5363 isteq(list[idx].n, ist("keep-alive")) ||
5364 isteq(list[idx].n, ist("upgrade")) ||
5365 isteq(list[idx].n, ist("te")) ||
5366 isteq(list[idx].n, ist("transfer-encoding")))
5367 continue;
5368
Christopher Faulet86d144c2019-08-14 16:32:25 +02005369 /* Skip all pseudo-headers */
5370 if (*(list[idx].n.ptr) == ':')
5371 continue;
5372
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005373 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5374 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005375 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005376 goto realign_again;
5377 goto full;
5378 }
5379 }
5380
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005381 if (outbuf.data == 9) {
5382 /* here we have a problem, we have nothing to emit (either we
5383 * received an empty trailers block followed or we removed its
5384 * contents above). Because of this we can't send a HEADERS
5385 * frame, so we have to cheat and instead send an empty DATA
5386 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005387 */
5388 outbuf.area[3] = H2_FT_DATA;
5389 outbuf.area[4] = H2_F_DATA_END_STREAM;
5390 }
5391
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005392 /* update the frame's size */
5393 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5394
5395 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005396 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 +02005397 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005398 h2s->flags |= H2_SF_ES_SENT;
5399
5400 if (h2s->st == H2_SS_OPEN)
5401 h2s->st = H2_SS_HLOC;
5402 else
5403 h2s_close(h2s);
5404
5405 /* OK we could properly deliver the response */
5406 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005407 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005408 ret = 0;
5409 idx = htx_get_head(htx);
5410 blk = htx_get_blk(htx, idx);
5411 while (blk != blk_end) {
5412 ret += htx_get_blksz(blk);
5413 blk = htx_remove_blk(htx, blk);
5414 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005415
5416 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5417 ret += htx_get_blksz(blk_end);
5418 htx_remove_blk(htx, blk_end);
5419 }
5420
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005421 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005422 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005423 return ret;
5424 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005425 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5426 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005427 h2c->flags |= H2_CF_MUX_MFULL;
5428 h2s->flags |= H2_SF_BLK_MROOM;
5429 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005430 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 +01005431 goto end;
5432 fail:
5433 /* unparsable HTX messages, too large ones to be produced in the local
5434 * list etc go here (unrecoverable errors).
5435 */
5436 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5437 ret = 0;
5438 goto end;
5439}
5440
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005441/* Called from the upper layer, to subscribe to events, such as being able to send.
5442 * The <param> argument here is supposed to be a pointer to a wait_event struct
5443 * which will be passed to h2s->recv_wait or h2s->send_wait depending on the
5444 * event_type. The event_type must only be a combination of SUB_RETRY_RECV and
5445 * SUB_RETRY_SEND, other values will lead to -1 being returned. It always
5446 * returns 0 except for the error above.
5447 */
Olivier Houchard6ff20392018-07-17 18:46:31 +02005448static int h2_subscribe(struct conn_stream *cs, int event_type, void *param)
5449{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005450 struct wait_event *sw;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005451 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005452 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005453
Willy Tarreau7838a792019-08-12 18:42:03 +02005454 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005455 if (event_type & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005456 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005457 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005458 BUG_ON(h2s->recv_wait != NULL || (sw->events & SUB_RETRY_RECV));
5459 sw->events |= SUB_RETRY_RECV;
5460 h2s->recv_wait = sw;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005461 event_type &= ~SUB_RETRY_RECV;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005462 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005463 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005464 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchard6ff20392018-07-17 18:46:31 +02005465 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005466 BUG_ON(h2s->send_wait != NULL || (sw->events & SUB_RETRY_SEND));
5467 sw->events |= SUB_RETRY_SEND;
5468 h2s->send_wait = sw;
5469 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5470 !LIST_ADDED(&h2s->list)) {
5471 if (h2s->flags & H2_SF_BLK_MFCTL)
5472 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5473 else
5474 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005475 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005476 event_type &= ~SUB_RETRY_SEND;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005477 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005478 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005479 if (event_type != 0)
5480 return -1;
5481 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005482}
5483
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005484/* Called from the upper layer, to unsubscribe some events (undo h2_subscribe).
5485 * The <param> argument here is supposed to be a pointer to the same wait_event
5486 * struct that was passed to h2_subscribe() otherwise nothing will be changed.
5487 * It always returns zero.
5488 */
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005489static int h2_unsubscribe(struct conn_stream *cs, int event_type, void *param)
5490{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005491 struct wait_event *sw;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005492 struct h2s *h2s = cs->ctx;
5493
Willy Tarreau7838a792019-08-12 18:42:03 +02005494 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005495 if (event_type & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005496 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005497 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005498 BUG_ON(h2s->recv_wait != sw);
5499 sw->events &= ~SUB_RETRY_RECV;
5500 h2s->recv_wait = NULL;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005501 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005502 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005503 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005504 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005505 BUG_ON(h2s->send_wait != sw);
5506 LIST_DEL(&h2s->list);
5507 LIST_INIT(&h2s->list);
5508 sw->events &= ~SUB_RETRY_SEND;
5509 /* We were about to send, make sure it does not happen */
5510 if (LIST_ADDED(&h2s->sending_list) &&
5511 h2s->send_wait != &h2s->wait_event) {
Willy Tarreau86eded62019-06-14 14:47:49 +02005512 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchardf8338152019-05-14 17:50:32 +02005513 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005514 }
Olivier Houchardf8338152019-05-14 17:50:32 +02005515 h2s->send_wait = NULL;
Olivier Houchardd846c262018-10-19 17:24:29 +02005516 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005517 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005518 return 0;
5519}
5520
5521
Olivier Houchard511efea2018-08-16 15:30:32 +02005522/* Called from the upper layer, to receive data */
5523static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5524{
Olivier Houchard638b7992018-08-16 15:41:52 +02005525 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005526 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005527 struct htx *h2s_htx = NULL;
5528 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005529 size_t ret = 0;
5530
Willy Tarreau7838a792019-08-12 18:42:03 +02005531 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
5532
Olivier Houchard511efea2018-08-16 15:30:32 +02005533 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005534 h2s_htx = htx_from_buf(&h2s->rxbuf);
5535 if (htx_is_empty(h2s_htx)) {
5536 /* Here htx_to_buf() will set buffer data to 0 because
5537 * the HTX is empty.
5538 */
5539 htx_to_buf(h2s_htx, &h2s->rxbuf);
5540 goto end;
5541 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005542
Christopher Faulet9b79a102019-07-15 11:22:56 +02005543 ret = h2s_htx->data;
5544 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005545
Christopher Faulet9b79a102019-07-15 11:22:56 +02005546 /* <buf> is empty and the message is small enough, swap the
5547 * buffers. */
5548 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005549 htx_to_buf(buf_htx, buf);
5550 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02005551 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5552 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01005553 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02005554
5555 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
5556
5557 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
5558 buf_htx->flags |= HTX_FL_PARSING_ERROR;
5559 if (htx_is_empty(buf_htx))
5560 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01005561 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005562
Christopher Faulet9b79a102019-07-15 11:22:56 +02005563 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
5564 htx_to_buf(buf_htx, buf);
5565 htx_to_buf(h2s_htx, &h2s->rxbuf);
5566 ret -= h2s_htx->data;
5567
Christopher Faulet37070b22019-02-14 15:12:14 +01005568 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005569 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005570 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005571 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005572 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005573 if (h2s->flags & H2_SF_ES_RCVD)
5574 cs->flags |= CS_FL_EOI;
Willy Tarreau76c83822019-06-15 09:55:50 +02005575 if (conn_xprt_read0_pending(h2c->conn) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02005576 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005577 if (cs->flags & CS_FL_ERR_PENDING)
5578 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005579 if (b_size(&h2s->rxbuf)) {
5580 b_free(&h2s->rxbuf);
5581 offer_buffers(NULL, tasks_run_queue);
5582 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005583 }
5584
Willy Tarreau082f5592018-11-25 08:03:32 +01005585 if (ret && h2c->dsi == h2s->id) {
5586 /* demux is blocking on this stream's buffer */
5587 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005588 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005589 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005590
Willy Tarreau7838a792019-08-12 18:42:03 +02005591 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02005592 return ret;
5593}
5594
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005595/* stops all senders of this connection for example when the mux buffer is full.
5596 * They are moved from the sending_list to either fctl_list or send_list.
5597 */
Olivier Houchardd846c262018-10-19 17:24:29 +02005598static void h2_stop_senders(struct h2c *h2c)
5599{
5600 struct h2s *h2s, *h2s_back;
5601
Olivier Houchardd360ac62019-03-22 17:37:16 +01005602 list_for_each_entry_safe(h2s, h2s_back, &h2c->sending_list, sending_list) {
5603 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreau86eded62019-06-14 14:47:49 +02005604 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005605 h2s->send_wait->events |= SUB_RETRY_SEND;
Olivier Houchardd846c262018-10-19 17:24:29 +02005606 }
5607}
5608
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005609/* Called from the upper layer, to send data from buffer <buf> for no more than
5610 * <count> bytes. Returns the number of bytes effectively sent. Some status
5611 * flags may be updated on the conn_stream.
5612 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005613static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005614{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005615 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005616 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005617 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005618 struct htx *htx;
5619 struct htx_blk *blk;
5620 enum htx_blk_type btype;
5621 uint32_t bsize;
5622 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005623
Willy Tarreau7838a792019-08-12 18:42:03 +02005624 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
5625
Olivier Houchardd360ac62019-03-22 17:37:16 +01005626 /* If we were not just woken because we wanted to send but couldn't,
5627 * and there's somebody else that is waiting to send, do nothing,
5628 * we will subscribe later and be put at the end of the list
5629 */
Willy Tarreauc234ae32019-05-13 17:56:11 +02005630 if (!LIST_ADDED(&h2s->sending_list) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02005631 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
5632 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 +01005633 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005634 }
Olivier Houchard998410a2019-04-15 19:23:37 +02005635 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01005636
Olivier Houchard998410a2019-04-15 19:23:37 +02005637 /* We couldn't set it to NULL before, because we needed it in case
5638 * we had to cancel the tasklet
5639 */
5640 h2s->send_wait = NULL;
5641
Willy Tarreau7838a792019-08-12 18:42:03 +02005642 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
5643 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 +02005644 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005645 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02005646
Christopher Faulet9b79a102019-07-15 11:22:56 +02005647 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005648
Willy Tarreau0bad0432018-06-14 16:54:01 +02005649 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01005650 h2s->flags |= H2_SF_OUTGOING_DATA;
5651
Willy Tarreau751f2d02018-10-05 09:35:00 +02005652 if (h2s->id == 0) {
5653 int32_t id = h2c_get_next_sid(h2s->h2c);
5654
5655 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02005656 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02005657 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 +02005658 return 0;
5659 }
5660
5661 eb32_delete(&h2s->by_id);
5662 h2s->by_id.key = h2s->id = id;
5663 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01005664 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005665 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
5666 }
5667
Christopher Faulet9b79a102019-07-15 11:22:56 +02005668 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
5669 count && !htx_is_empty(htx)) {
5670 idx = htx_get_head(htx);
5671 blk = htx_get_blk(htx, idx);
5672 btype = htx_get_blk_type(blk);
5673 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005674
Christopher Faulet9b79a102019-07-15 11:22:56 +02005675 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02005676 case HTX_BLK_REQ_SL:
5677 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005678 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02005679 if (ret > 0) {
5680 total += ret;
5681 count -= ret;
5682 if (ret < bsize)
5683 goto done;
5684 }
5685 break;
5686
Willy Tarreau115e83b2018-12-01 19:17:53 +01005687 case HTX_BLK_RES_SL:
5688 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005689 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005690 if (ret > 0) {
5691 total += ret;
5692 count -= ret;
5693 if (ret < bsize)
5694 goto done;
5695 }
5696 break;
5697
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005698 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005699 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005700 /* all these cause the emission of a DATA frame (possibly empty).
5701 * This EOM necessarily is one before trailers, as the EOM following
5702 * trailers would have been consumed by the trailers parser.
5703 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005704 ret = h2s_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005705 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01005706 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005707 total += ret;
5708 count -= ret;
5709 if (ret < bsize)
5710 goto done;
5711 }
5712 break;
5713
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005714 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005715 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005716 /* This is the first trailers block, all the subsequent ones AND
5717 * the EOM will be swallowed by the parser.
5718 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005719 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005720 if (ret > 0) {
5721 total += ret;
5722 count -= ret;
5723 if (ret < bsize)
5724 goto done;
5725 }
5726 break;
5727
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005728 default:
5729 htx_remove_blk(htx, blk);
5730 total += bsize;
5731 count -= bsize;
5732 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005733 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005734 }
5735
Christopher Faulet9b79a102019-07-15 11:22:56 +02005736 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02005737 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02005738 /* trim any possibly pending data after we close (extra CR-LF,
5739 * unprocessed trailers, abnormal extra data, ...)
5740 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005741 total += count;
5742 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02005743 }
5744
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005745 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01005746 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005747 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 +01005748 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01005749 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01005750 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005751 }
5752
Christopher Faulet9b79a102019-07-15 11:22:56 +02005753 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02005754
5755 /* The mux is full, cancel the pending tasks */
5756 if ((h2s->h2c->flags & H2_CF_MUX_BLOCK_ANY) ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005757 (h2s->flags & H2_SF_BLK_MBUSY)) {
5758 TRACE_DEVEL("mux full, stopping senders", H2_EV_H2S_SEND|H2_EV_H2C_BLK|H2_EV_H2S_BLK, h2s->h2c->conn, h2s);
Olivier Houchardd846c262018-10-19 17:24:29 +02005759 h2_stop_senders(h2s->h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02005760 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005761
Olivier Houchard7505f942018-08-21 18:10:44 +02005762 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005763 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau7838a792019-08-12 18:42:03 +02005764 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 +02005765 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Olivier Houchardd846c262018-10-19 17:24:29 +02005766
Olivier Houchard7505f942018-08-21 18:10:44 +02005767 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01005768 /* If we're waiting for flow control, and we got a shutr on the
5769 * connection, we will never be unlocked, so add an error on
5770 * the conn_stream.
5771 */
5772 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
5773 !b_data(&h2s->h2c->dbuf) &&
5774 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005775 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 +01005776 if (cs->flags & CS_FL_EOS)
5777 cs->flags |= CS_FL_ERROR;
5778 else
5779 cs->flags |= CS_FL_ERR_PENDING;
5780 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005781
5782 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL)) {
5783 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01005784 LIST_DEL_INIT(&h2s->list);
5785 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005786
Willy Tarreau7838a792019-08-12 18:42:03 +02005787 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005788 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02005789}
5790
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005791/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02005792static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005793{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01005794 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01005795 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005796 struct eb32_node *node;
5797 int fctl_cnt = 0;
5798 int send_cnt = 0;
5799 int tree_cnt = 0;
5800 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02005801 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005802
5803 if (!h2c)
5804 return;
5805
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005806 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005807 fctl_cnt++;
5808
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005809 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005810 send_cnt++;
5811
Willy Tarreau3af37712018-12-18 14:34:41 +01005812 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005813 node = eb32_first(&h2c->streams_by_id);
5814 while (node) {
5815 h2s = container_of(node, struct h2s, by_id);
5816 tree_cnt++;
5817 if (!h2s->cs)
5818 orph_cnt++;
5819 node = eb32_next(node);
5820 }
5821
Willy Tarreau60f62682019-05-26 11:32:27 +02005822 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005823 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02005824 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01005825 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02005826 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
5827 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02005828 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02005829 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005830 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01005831 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
5832 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
5833 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02005834 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
5835 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
5836 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02005837 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
5838 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01005839
5840 if (h2s) {
Willy Tarreauab2ec452019-08-30 07:07:08 +02005841 chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s.flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
5842 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01005843 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
5844 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
5845 h2s->cs);
5846 if (h2s->cs)
5847 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
5848 h2s->cs->flags, h2s->cs->data);
5849 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005850}
Willy Tarreau62f52692017-10-08 23:01:42 +02005851
5852/*******************************************************/
5853/* functions below are dedicated to the config parsers */
5854/*******************************************************/
5855
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005856/* config parser for global "tune.h2.header-table-size" */
5857static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
5858 struct proxy *defpx, const char *file, int line,
5859 char **err)
5860{
5861 if (too_many_args(1, args, err, NULL))
5862 return -1;
5863
5864 h2_settings_header_table_size = atoi(args[1]);
5865 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
5866 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
5867 return -1;
5868 }
5869 return 0;
5870}
Willy Tarreau62f52692017-10-08 23:01:42 +02005871
Willy Tarreaue6baec02017-07-27 11:45:11 +02005872/* config parser for global "tune.h2.initial-window-size" */
5873static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
5874 struct proxy *defpx, const char *file, int line,
5875 char **err)
5876{
5877 if (too_many_args(1, args, err, NULL))
5878 return -1;
5879
5880 h2_settings_initial_window_size = atoi(args[1]);
5881 if (h2_settings_initial_window_size < 0) {
5882 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5883 return -1;
5884 }
5885 return 0;
5886}
5887
Willy Tarreau5242ef82017-07-27 11:47:28 +02005888/* config parser for global "tune.h2.max-concurrent-streams" */
5889static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
5890 struct proxy *defpx, const char *file, int line,
5891 char **err)
5892{
5893 if (too_many_args(1, args, err, NULL))
5894 return -1;
5895
5896 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01005897 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02005898 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5899 return -1;
5900 }
5901 return 0;
5902}
5903
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005904/* config parser for global "tune.h2.max-frame-size" */
5905static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
5906 struct proxy *defpx, const char *file, int line,
5907 char **err)
5908{
5909 if (too_many_args(1, args, err, NULL))
5910 return -1;
5911
5912 h2_settings_max_frame_size = atoi(args[1]);
5913 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
5914 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
5915 return -1;
5916 }
5917 return 0;
5918}
5919
Willy Tarreau62f52692017-10-08 23:01:42 +02005920
5921/****************************************/
5922/* MUX initialization and instanciation */
5923/***************************************/
5924
5925/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01005926static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02005927 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02005928 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02005929 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02005930 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02005931 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005932 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02005933 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01005934 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02005935 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01005936 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01005937 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01005938 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02005939 .shutr = h2_shutr,
5940 .shutw = h2_shutw,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005941 .show_fd = h2_show_fd,
Christopher Faulet9b79a102019-07-15 11:22:56 +02005942 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX,
Willy Tarreau62f52692017-10-08 23:01:42 +02005943 .name = "H2",
5944};
5945
Christopher Faulet32f61c02018-04-10 14:33:41 +02005946static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02005947 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02005948
Willy Tarreau0108d902018-11-25 19:14:37 +01005949INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
5950
Willy Tarreau62f52692017-10-08 23:01:42 +02005951/* config keyword parsers */
5952static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005953 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02005954 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02005955 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005956 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02005957 { 0, NULL, NULL }
5958}};
5959
Willy Tarreau0108d902018-11-25 19:14:37 +01005960INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);