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Willy Tarreau62f52692017-10-08 23:01:42 +02001/*
2 * HTTP/2 mux-demux for connections
3 *
4 * Copyright 2017 Willy Tarreau <w@1wt.eu>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
Willy Tarreaudfd3de82020-06-04 23:46:14 +020013#include <import/eb32tree.h>
Willy Tarreau4c7e4b72020-05-27 12:58:42 +020014#include <haproxy/api.h>
Willy Tarreau6be78492020-06-05 00:00:29 +020015#include <haproxy/cfgparse.h>
Willy Tarreau7ea393d2020-06-04 18:02:10 +020016#include <haproxy/connection.h>
Willy Tarreau5413a872020-06-02 19:33:08 +020017#include <haproxy/h1.h>
Willy Tarreaubf073142020-06-03 12:04:01 +020018#include <haproxy/h2.h>
Willy Tarreaube327fa2020-06-03 09:09:57 +020019#include <haproxy/hpack-dec.h>
20#include <haproxy/hpack-enc.h>
21#include <haproxy/hpack-tbl.h>
Willy Tarreau87735332020-06-04 09:08:41 +020022#include <haproxy/http_htx.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020023#include <haproxy/htx.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020024#include <haproxy/istbuf.h>
Willy Tarreau36979d92020-06-05 17:27:29 +020025#include <haproxy/log.h>
Willy Tarreau6131d6a2020-06-02 16:48:09 +020026#include <haproxy/net_helper.h>
Willy Tarreau48d25b32020-06-04 18:58:52 +020027#include <haproxy/session-t.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020028#include <haproxy/stream.h>
Willy Tarreau5e539c92020-06-04 20:45:39 +020029#include <haproxy/stream_interface.h>
Willy Tarreauc6d61d72020-06-04 19:02:42 +020030#include <haproxy/trace.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020031
32
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010033/* dummy streams returned for closed, error, refused, idle and states */
Willy Tarreau2a856182017-05-16 15:20:39 +020034static const struct h2s *h2_closed_stream;
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010035static const struct h2s *h2_error_stream;
Willy Tarreau8d0d58b2018-12-23 18:29:12 +010036static const struct h2s *h2_refused_stream;
Willy Tarreau2a856182017-05-16 15:20:39 +020037static const struct h2s *h2_idle_stream;
38
Willy Tarreau5ab6b572017-09-22 08:05:00 +020039/* Connection flags (32 bit), in h2c->flags */
40#define H2_CF_NONE 0x00000000
41
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020042/* Flags indicating why writing to the mux is blocked. */
43#define H2_CF_MUX_MALLOC 0x00000001 // mux blocked on lack of connection's mux buffer
44#define H2_CF_MUX_MFULL 0x00000002 // mux blocked on connection's mux buffer full
45#define H2_CF_MUX_BLOCK_ANY 0x00000003 // aggregate of the mux flags above
46
Willy Tarreau315d8072017-12-10 22:17:57 +010047/* Flags indicating why writing to the demux is blocked.
48 * The first two ones directly affect the ability for the mux to receive data
49 * from the connection. The other ones affect the mux's ability to demux
50 * received data.
51 */
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020052#define H2_CF_DEM_DALLOC 0x00000004 // demux blocked on lack of connection's demux buffer
53#define H2_CF_DEM_DFULL 0x00000008 // demux blocked on connection's demux buffer full
Willy Tarreau315d8072017-12-10 22:17:57 +010054
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020055#define H2_CF_DEM_MBUSY 0x00000010 // demux blocked on connection's mux side busy
56#define H2_CF_DEM_MROOM 0x00000020 // demux blocked on lack of room in mux buffer
57#define H2_CF_DEM_SALLOC 0x00000040 // demux blocked on lack of stream's request buffer
58#define H2_CF_DEM_SFULL 0x00000080 // demux blocked on stream request buffer full
Willy Tarreauf2101912018-07-19 10:11:38 +020059#define H2_CF_DEM_TOOMANY 0x00000100 // demux blocked waiting for some conn_streams to leave
60#define H2_CF_DEM_BLOCK_ANY 0x000001F0 // aggregate of the demux flags above except DALLOC/DFULL
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020061
Willy Tarreau081d4722017-05-16 21:51:05 +020062/* other flags */
Willy Tarreauf2101912018-07-19 10:11:38 +020063#define H2_CF_GOAWAY_SENT 0x00001000 // a GOAWAY frame was successfully sent
64#define H2_CF_GOAWAY_FAILED 0x00002000 // a GOAWAY frame failed to be sent
65#define H2_CF_WAIT_FOR_HS 0x00004000 // We did check that at least a stream was waiting for handshake
Willy Tarreaub3fb56d2018-10-03 13:56:38 +020066#define H2_CF_IS_BACK 0x00008000 // this is an outgoing connection
Willy Tarreau97aaa672018-12-23 09:49:04 +010067#define H2_CF_WINDOW_OPENED 0x00010000 // demux increased window already advertised
Willy Tarreau081d4722017-05-16 21:51:05 +020068
Willy Tarreau5ab6b572017-09-22 08:05:00 +020069/* H2 connection state, in h2c->st0 */
70enum h2_cs {
71 H2_CS_PREFACE, // init done, waiting for connection preface
72 H2_CS_SETTINGS1, // preface OK, waiting for first settings frame
73 H2_CS_FRAME_H, // first settings frame ok, waiting for frame header
74 H2_CS_FRAME_P, // frame header OK, waiting for frame payload
Willy Tarreaua20a5192017-12-27 11:02:06 +010075 H2_CS_FRAME_A, // frame payload OK, trying to send ACK frame
76 H2_CS_FRAME_E, // frame payload OK, trying to send RST frame
Willy Tarreau5ab6b572017-09-22 08:05:00 +020077 H2_CS_ERROR, // send GOAWAY(errcode) and close the connection ASAP
78 H2_CS_ERROR2, // GOAWAY(errcode) sent, close the connection ASAP
79 H2_CS_ENTRIES // must be last
80} __attribute__((packed));
81
Willy Tarreau51330962019-05-26 09:38:07 +020082
Willy Tarreau9c218e72019-05-26 10:08:28 +020083/* 32 buffers: one for the ring's root, rest for the mbuf itself */
84#define H2C_MBUF_CNT 32
Willy Tarreau51330962019-05-26 09:38:07 +020085
Willy Tarreau5ab6b572017-09-22 08:05:00 +020086/* H2 connection descriptor */
87struct h2c {
88 struct connection *conn;
89
90 enum h2_cs st0; /* mux state */
91 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
92
93 /* 16 bit hole here */
94 uint32_t flags; /* connection flags: H2_CF_* */
Willy Tarreau2e2083a2019-01-31 10:34:07 +010095 uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
Willy Tarreau5ab6b572017-09-22 08:05:00 +020096 int32_t max_id; /* highest ID known on this connection, <0 before preface */
97 uint32_t rcvd_c; /* newly received data to ACK for the connection */
98 uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) */
99
100 /* states for the demux direction */
101 struct hpack_dht *ddht; /* demux dynamic header table */
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200102 struct buffer dbuf; /* demux buffer */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200103
104 int32_t dsi; /* demux stream ID (<0 = idle) */
105 int32_t dfl; /* demux frame length (if dsi >= 0) */
106 int8_t dft; /* demux frame type (if dsi >= 0) */
107 int8_t dff; /* demux frame flags (if dsi >= 0) */
Willy Tarreau05e5daf2017-12-11 15:17:36 +0100108 uint8_t dpl; /* demux pad length (part of dfl), init to 0 */
109 /* 8 bit hole here */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200110 int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */
111
112 /* states for the mux direction */
Willy Tarreau51330962019-05-26 09:38:07 +0200113 struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200114 int32_t msi; /* mux stream ID (<0 = idle) */
115 int32_t mfl; /* mux frame length (if dsi >= 0) */
116 int8_t mft; /* mux frame type (if dsi >= 0) */
117 int8_t mff; /* mux frame flags (if dsi >= 0) */
118 /* 16 bit hole here */
119 int32_t miw; /* mux initial window size for all new streams */
120 int32_t mws; /* mux window size. Can be negative. */
121 int32_t mfs; /* mux's max frame size */
122
Willy Tarreauea392822017-10-31 10:02:25 +0100123 int timeout; /* idle timeout duration in ticks */
Willy Tarreau599391a2017-11-24 10:16:00 +0100124 int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */
Willy Tarreau49745612017-12-03 18:56:02 +0100125 unsigned int nb_streams; /* number of streams in the tree */
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200126 unsigned int nb_cs; /* number of attached conn_streams */
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100127 unsigned int nb_reserved; /* number of reserved streams */
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100128 unsigned int stream_cnt; /* total number of streams seen */
Willy Tarreau0b37d652018-10-03 10:33:02 +0200129 struct proxy *proxy; /* the proxy this connection was created for */
Willy Tarreauea392822017-10-31 10:02:25 +0100130 struct task *task; /* timeout management task */
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) */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100135 struct buffer_wait buf_wait; /* wait list for buffer allocations */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200136 struct wait_event wait_event; /* To be used if we're waiting for I/Os */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200137};
138
Willy Tarreau18312642017-10-11 07:57:07 +0200139/* H2 stream state, in h2s->st */
140enum h2_ss {
141 H2_SS_IDLE = 0, // idle
142 H2_SS_RLOC, // reserved(local)
143 H2_SS_RREM, // reserved(remote)
144 H2_SS_OPEN, // open
145 H2_SS_HREM, // half-closed(remote)
146 H2_SS_HLOC, // half-closed(local)
Willy Tarreau96060ba2017-10-16 18:34:34 +0200147 H2_SS_ERROR, // an error needs to be sent using RST_STREAM
Willy Tarreau18312642017-10-11 07:57:07 +0200148 H2_SS_CLOSED, // closed
149 H2_SS_ENTRIES // must be last
150} __attribute__((packed));
151
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200152#define H2_SS_MASK(state) (1UL << (state))
153#define H2_SS_IDLE_BIT (1UL << H2_SS_IDLE)
154#define H2_SS_RLOC_BIT (1UL << H2_SS_RLOC)
155#define H2_SS_RREM_BIT (1UL << H2_SS_RREM)
156#define H2_SS_OPEN_BIT (1UL << H2_SS_OPEN)
157#define H2_SS_HREM_BIT (1UL << H2_SS_HREM)
158#define H2_SS_HLOC_BIT (1UL << H2_SS_HLOC)
159#define H2_SS_ERROR_BIT (1UL << H2_SS_ERROR)
160#define H2_SS_CLOSED_BIT (1UL << H2_SS_CLOSED)
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200161
Willy Tarreau18312642017-10-11 07:57:07 +0200162/* HTTP/2 stream flags (32 bit), in h2s->flags */
163#define H2_SF_NONE 0x00000000
164#define H2_SF_ES_RCVD 0x00000001
165#define H2_SF_ES_SENT 0x00000002
166
167#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
168#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
169
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200170/* stream flags indicating the reason the stream is blocked */
171#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200172#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux (must be in send list)
173#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl (must be in fctl list)
174#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl (must be in blocked list)
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200175#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
176
Willy Tarreau454f9052017-10-26 19:40:35 +0200177/* stream flags indicating how data is supposed to be sent */
178#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
Willy Tarreaud9464162020-01-10 18:25:07 +0100179/* unused flags: 0x00000200, 0x00000400 */
Willy Tarreau454f9052017-10-26 19:40:35 +0200180
Willy Tarreaud9464162020-01-10 18:25:07 +0100181#define H2_SF_NOTIFIED 0x00000800 // a paused stream was notified to try to send again
Willy Tarreau67434202017-11-06 20:20:51 +0100182#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100183#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100184
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100185#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
186
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200187#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
188#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200189#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200190
191
Willy Tarreau18312642017-10-11 07:57:07 +0200192/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
193 * it is being processed in the internal HTTP representation (H1 for now).
194 */
195struct h2s {
196 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100197 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200198 struct h2c *h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +0200199 struct h1m h1m; /* request or response parser state for H1 */
Willy Tarreau18312642017-10-11 07:57:07 +0200200 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200201 int32_t id; /* stream ID */
202 uint32_t flags; /* H2_SF_* */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200203 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200204 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
205 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200206 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100207 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200208 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Willy Tarreauf96508a2020-01-10 11:12:48 +0100209 struct wait_event *subs; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200210 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Willy Tarreau5723f292020-01-10 15:16:57 +0100211 struct tasklet *shut_tl; /* deferred shutdown tasklet, to retry to send an RST after we failed to,
212 * in case there's no other subscription to do it */
Willy Tarreau18312642017-10-11 07:57:07 +0200213};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200214
Willy Tarreauc6405142017-09-21 20:23:50 +0200215/* descriptor for an h2 frame header */
216struct h2_fh {
217 uint32_t len; /* length, host order, 24 bits */
218 uint32_t sid; /* stream id, host order, 31 bits */
219 uint8_t ft; /* frame type */
220 uint8_t ff; /* frame flags */
221};
222
Willy Tarreau12ae2122019-08-08 18:23:12 +0200223/* trace source and events */
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200224static void h2_trace(enum trace_level level, uint64_t mask, \
225 const struct trace_source *src,
226 const struct ist where, const struct ist func,
227 const void *a1, const void *a2, const void *a3, const void *a4);
Willy Tarreau12ae2122019-08-08 18:23:12 +0200228
229/* The event representation is split like this :
230 * strm - application layer
231 * h2s - internal H2 stream
232 * h2c - internal H2 connection
233 * conn - external connection
234 *
235 */
236static const struct trace_event h2_trace_events[] = {
237#define H2_EV_H2C_NEW (1ULL << 0)
Willy Tarreau87951942019-08-30 07:34:36 +0200238 { .mask = H2_EV_H2C_NEW, .name = "h2c_new", .desc = "new H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200239#define H2_EV_H2C_RECV (1ULL << 1)
Willy Tarreau87951942019-08-30 07:34:36 +0200240 { .mask = H2_EV_H2C_RECV, .name = "h2c_recv", .desc = "Rx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200241#define H2_EV_H2C_SEND (1ULL << 2)
Willy Tarreau87951942019-08-30 07:34:36 +0200242 { .mask = H2_EV_H2C_SEND, .name = "h2c_send", .desc = "Tx on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200243#define H2_EV_H2C_FCTL (1ULL << 3)
Willy Tarreau87951942019-08-30 07:34:36 +0200244 { .mask = H2_EV_H2C_FCTL, .name = "h2c_fctl", .desc = "H2 connection flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200245#define H2_EV_H2C_BLK (1ULL << 4)
Willy Tarreau87951942019-08-30 07:34:36 +0200246 { .mask = H2_EV_H2C_BLK, .name = "h2c_blk", .desc = "H2 connection blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200247#define H2_EV_H2C_WAKE (1ULL << 5)
Willy Tarreau87951942019-08-30 07:34:36 +0200248 { .mask = H2_EV_H2C_WAKE, .name = "h2c_wake", .desc = "H2 connection woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200249#define H2_EV_H2C_END (1ULL << 6)
Willy Tarreau87951942019-08-30 07:34:36 +0200250 { .mask = H2_EV_H2C_END, .name = "h2c_end", .desc = "H2 connection terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200251#define H2_EV_H2C_ERR (1ULL << 7)
Willy Tarreau87951942019-08-30 07:34:36 +0200252 { .mask = H2_EV_H2C_ERR, .name = "h2c_err", .desc = "error on H2 connection" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200253#define H2_EV_RX_FHDR (1ULL << 8)
Willy Tarreau87951942019-08-30 07:34:36 +0200254 { .mask = H2_EV_RX_FHDR, .name = "rx_fhdr", .desc = "H2 frame header received" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200255#define H2_EV_RX_FRAME (1ULL << 9)
Willy Tarreau87951942019-08-30 07:34:36 +0200256 { .mask = H2_EV_RX_FRAME, .name = "rx_frame", .desc = "receipt of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200257#define H2_EV_RX_EOI (1ULL << 10)
Willy Tarreau87951942019-08-30 07:34:36 +0200258 { .mask = H2_EV_RX_EOI, .name = "rx_eoi", .desc = "receipt of end of H2 input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200259#define H2_EV_RX_PREFACE (1ULL << 11)
Willy Tarreau87951942019-08-30 07:34:36 +0200260 { .mask = H2_EV_RX_PREFACE, .name = "rx_preface", .desc = "receipt of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200261#define H2_EV_RX_DATA (1ULL << 12)
Willy Tarreau87951942019-08-30 07:34:36 +0200262 { .mask = H2_EV_RX_DATA, .name = "rx_data", .desc = "receipt of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200263#define H2_EV_RX_HDR (1ULL << 13)
Willy Tarreau87951942019-08-30 07:34:36 +0200264 { .mask = H2_EV_RX_HDR, .name = "rx_hdr", .desc = "receipt of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200265#define H2_EV_RX_PRIO (1ULL << 14)
Willy Tarreau87951942019-08-30 07:34:36 +0200266 { .mask = H2_EV_RX_PRIO, .name = "rx_prio", .desc = "receipt of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200267#define H2_EV_RX_RST (1ULL << 15)
Willy Tarreau87951942019-08-30 07:34:36 +0200268 { .mask = H2_EV_RX_RST, .name = "rx_rst", .desc = "receipt of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200269#define H2_EV_RX_SETTINGS (1ULL << 16)
Willy Tarreau87951942019-08-30 07:34:36 +0200270 { .mask = H2_EV_RX_SETTINGS, .name = "rx_settings", .desc = "receipt of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200271#define H2_EV_RX_PUSH (1ULL << 17)
Willy Tarreau87951942019-08-30 07:34:36 +0200272 { .mask = H2_EV_RX_PUSH, .name = "rx_push", .desc = "receipt of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200273#define H2_EV_RX_PING (1ULL << 18)
Willy Tarreau87951942019-08-30 07:34:36 +0200274 { .mask = H2_EV_RX_PING, .name = "rx_ping", .desc = "receipt of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200275#define H2_EV_RX_GOAWAY (1ULL << 19)
Willy Tarreau87951942019-08-30 07:34:36 +0200276 { .mask = H2_EV_RX_GOAWAY, .name = "rx_goaway", .desc = "receipt of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200277#define H2_EV_RX_WU (1ULL << 20)
Willy Tarreau87951942019-08-30 07:34:36 +0200278 { .mask = H2_EV_RX_WU, .name = "rx_wu", .desc = "receipt of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200279#define H2_EV_RX_CONT (1ULL << 21)
Willy Tarreau87951942019-08-30 07:34:36 +0200280 { .mask = H2_EV_RX_CONT, .name = "rx_cont", .desc = "receipt of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200281#define H2_EV_TX_FRAME (1ULL << 22)
Willy Tarreau87951942019-08-30 07:34:36 +0200282 { .mask = H2_EV_TX_FRAME, .name = "tx_frame", .desc = "transmission of any H2 frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200283#define H2_EV_TX_EOI (1ULL << 23)
Willy Tarreau87951942019-08-30 07:34:36 +0200284 { .mask = H2_EV_TX_EOI, .name = "tx_eoi", .desc = "transmission of H2 end of input (ES or RST)" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200285#define H2_EV_TX_PREFACE (1ULL << 24)
Willy Tarreau87951942019-08-30 07:34:36 +0200286 { .mask = H2_EV_TX_PREFACE, .name = "tx_preface", .desc = "transmission of H2 preface" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200287#define H2_EV_TX_DATA (1ULL << 25)
Willy Tarreau87951942019-08-30 07:34:36 +0200288 { .mask = H2_EV_TX_DATA, .name = "tx_data", .desc = "transmission of H2 DATA frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200289#define H2_EV_TX_HDR (1ULL << 26)
Willy Tarreau87951942019-08-30 07:34:36 +0200290 { .mask = H2_EV_TX_HDR, .name = "tx_hdr", .desc = "transmission of H2 HEADERS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200291#define H2_EV_TX_PRIO (1ULL << 27)
Willy Tarreau87951942019-08-30 07:34:36 +0200292 { .mask = H2_EV_TX_PRIO, .name = "tx_prio", .desc = "transmission of H2 PRIORITY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200293#define H2_EV_TX_RST (1ULL << 28)
Willy Tarreau87951942019-08-30 07:34:36 +0200294 { .mask = H2_EV_TX_RST, .name = "tx_rst", .desc = "transmission of H2 RST_STREAM frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200295#define H2_EV_TX_SETTINGS (1ULL << 29)
Willy Tarreau87951942019-08-30 07:34:36 +0200296 { .mask = H2_EV_TX_SETTINGS, .name = "tx_settings", .desc = "transmission of H2 SETTINGS frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200297#define H2_EV_TX_PUSH (1ULL << 30)
Willy Tarreau87951942019-08-30 07:34:36 +0200298 { .mask = H2_EV_TX_PUSH, .name = "tx_push", .desc = "transmission of H2 PUSH_PROMISE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200299#define H2_EV_TX_PING (1ULL << 31)
Willy Tarreau87951942019-08-30 07:34:36 +0200300 { .mask = H2_EV_TX_PING, .name = "tx_ping", .desc = "transmission of H2 PING frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200301#define H2_EV_TX_GOAWAY (1ULL << 32)
Willy Tarreau87951942019-08-30 07:34:36 +0200302 { .mask = H2_EV_TX_GOAWAY, .name = "tx_goaway", .desc = "transmission of H2 GOAWAY frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200303#define H2_EV_TX_WU (1ULL << 33)
Willy Tarreau87951942019-08-30 07:34:36 +0200304 { .mask = H2_EV_TX_WU, .name = "tx_wu", .desc = "transmission of H2 WINDOW_UPDATE frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200305#define H2_EV_TX_CONT (1ULL << 34)
Willy Tarreau87951942019-08-30 07:34:36 +0200306 { .mask = H2_EV_TX_CONT, .name = "tx_cont", .desc = "transmission of H2 CONTINUATION frame" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200307#define H2_EV_H2S_NEW (1ULL << 35)
Willy Tarreau87951942019-08-30 07:34:36 +0200308 { .mask = H2_EV_H2S_NEW, .name = "h2s_new", .desc = "new H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200309#define H2_EV_H2S_RECV (1ULL << 36)
Willy Tarreau87951942019-08-30 07:34:36 +0200310 { .mask = H2_EV_H2S_RECV, .name = "h2s_recv", .desc = "Rx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200311#define H2_EV_H2S_SEND (1ULL << 37)
Willy Tarreau87951942019-08-30 07:34:36 +0200312 { .mask = H2_EV_H2S_SEND, .name = "h2s_send", .desc = "Tx for H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200313#define H2_EV_H2S_FCTL (1ULL << 38)
Willy Tarreau87951942019-08-30 07:34:36 +0200314 { .mask = H2_EV_H2S_FCTL, .name = "h2s_fctl", .desc = "H2 stream flow-controlled" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200315#define H2_EV_H2S_BLK (1ULL << 39)
Willy Tarreau87951942019-08-30 07:34:36 +0200316 { .mask = H2_EV_H2S_BLK, .name = "h2s_blk", .desc = "H2 stream blocked" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200317#define H2_EV_H2S_WAKE (1ULL << 40)
Willy Tarreau87951942019-08-30 07:34:36 +0200318 { .mask = H2_EV_H2S_WAKE, .name = "h2s_wake", .desc = "H2 stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200319#define H2_EV_H2S_END (1ULL << 41)
Willy Tarreau87951942019-08-30 07:34:36 +0200320 { .mask = H2_EV_H2S_END, .name = "h2s_end", .desc = "H2 stream terminated" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200321#define H2_EV_H2S_ERR (1ULL << 42)
Willy Tarreau87951942019-08-30 07:34:36 +0200322 { .mask = H2_EV_H2S_ERR, .name = "h2s_err", .desc = "error on H2 stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200323#define H2_EV_STRM_NEW (1ULL << 43)
Willy Tarreau87951942019-08-30 07:34:36 +0200324 { .mask = H2_EV_STRM_NEW, .name = "strm_new", .desc = "app-layer stream creation" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200325#define H2_EV_STRM_RECV (1ULL << 44)
Willy Tarreau87951942019-08-30 07:34:36 +0200326 { .mask = H2_EV_STRM_RECV, .name = "strm_recv", .desc = "receiving data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200327#define H2_EV_STRM_SEND (1ULL << 45)
Willy Tarreau87951942019-08-30 07:34:36 +0200328 { .mask = H2_EV_STRM_SEND, .name = "strm_send", .desc = "sending data for stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200329#define H2_EV_STRM_FULL (1ULL << 46)
Willy Tarreau87951942019-08-30 07:34:36 +0200330 { .mask = H2_EV_STRM_FULL, .name = "strm_full", .desc = "stream buffer full" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200331#define H2_EV_STRM_WAKE (1ULL << 47)
Willy Tarreau87951942019-08-30 07:34:36 +0200332 { .mask = H2_EV_STRM_WAKE, .name = "strm_wake", .desc = "stream woken up" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200333#define H2_EV_STRM_SHUT (1ULL << 48)
Willy Tarreau87951942019-08-30 07:34:36 +0200334 { .mask = H2_EV_STRM_SHUT, .name = "strm_shut", .desc = "stream shutdown" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200335#define H2_EV_STRM_END (1ULL << 49)
Willy Tarreau87951942019-08-30 07:34:36 +0200336 { .mask = H2_EV_STRM_END, .name = "strm_end", .desc = "detaching app-layer stream" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200337#define H2_EV_STRM_ERR (1ULL << 50)
Willy Tarreau87951942019-08-30 07:34:36 +0200338 { .mask = H2_EV_STRM_ERR, .name = "strm_err", .desc = "stream error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200339#define H2_EV_PROTO_ERR (1ULL << 51)
Willy Tarreau87951942019-08-30 07:34:36 +0200340 { .mask = H2_EV_PROTO_ERR, .name = "proto_err", .desc = "protocol error" },
Willy Tarreau12ae2122019-08-08 18:23:12 +0200341 { }
342};
343
344static const struct name_desc h2_trace_lockon_args[4] = {
345 /* arg1 */ { /* already used by the connection */ },
346 /* arg2 */ { .name="h2s", .desc="H2 stream" },
347 /* arg3 */ { },
348 /* arg4 */ { }
349};
350
351static const struct name_desc h2_trace_decoding[] = {
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200352#define H2_VERB_CLEAN 1
353 { .name="clean", .desc="only user-friendly stuff, generally suitable for level \"user\"" },
354#define H2_VERB_MINIMAL 2
Willy Tarreau12ae2122019-08-08 18:23:12 +0200355 { .name="minimal", .desc="report only h2c/h2s state and flags, no real decoding" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200356#define H2_VERB_SIMPLE 3
Willy Tarreau12ae2122019-08-08 18:23:12 +0200357 { .name="simple", .desc="add request/response status line or frame info when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200358#define H2_VERB_ADVANCED 4
Willy Tarreau12ae2122019-08-08 18:23:12 +0200359 { .name="advanced", .desc="add header fields or frame decoding when available" },
Willy Tarreauf7dd5192019-08-30 07:21:18 +0200360#define H2_VERB_COMPLETE 5
Willy Tarreau12ae2122019-08-08 18:23:12 +0200361 { .name="complete", .desc="add full data dump when available" },
362 { /* end */ }
363};
364
365static struct trace_source trace_h2 = {
366 .name = IST("h2"),
367 .desc = "HTTP/2 multiplexer",
368 .arg_def = TRC_ARG1_CONN, // TRACE()'s first argument is always a connection
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200369 .default_cb = h2_trace,
Willy Tarreau12ae2122019-08-08 18:23:12 +0200370 .known_events = h2_trace_events,
371 .lockon_args = h2_trace_lockon_args,
372 .decoding = h2_trace_decoding,
373 .report_events = ~0, // report everything by default
374};
375
376#define TRACE_SOURCE &trace_h2
377INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);
378
Willy Tarreau8ceae722018-11-26 11:58:30 +0100379/* the h2c connection pool */
380DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
381
382/* the h2s stream pool */
383DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
384
Willy Tarreaudc572362018-12-12 08:08:05 +0100385/* The default connection window size is 65535, it may only be enlarged using
386 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
387 * we'll pretend we already received the difference between the two to send
388 * an equivalent window update to enlarge it to 2G-1.
389 */
390#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
391
Willy Tarreau455d5682019-05-24 19:42:18 +0200392/* maximum amount of data we're OK with re-aligning for buffer optimizations */
393#define MAX_DATA_REALIGN 1024
394
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200395/* a few settings from the global section */
396static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200397static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100398static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100399static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200400
Willy Tarreau2a856182017-05-16 15:20:39 +0200401/* a dmumy closed stream */
402static const struct h2s *h2_closed_stream = &(const struct h2s){
403 .cs = NULL,
404 .h2c = NULL,
405 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100406 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100407 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200408 .id = 0,
409};
410
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100411/* a dmumy closed stream returning a PROTOCOL_ERROR error */
412static const struct h2s *h2_error_stream = &(const struct h2s){
413 .cs = NULL,
414 .h2c = NULL,
415 .st = H2_SS_CLOSED,
416 .errcode = H2_ERR_PROTOCOL_ERROR,
417 .flags = 0,
418 .id = 0,
419};
420
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100421/* a dmumy closed stream returning a REFUSED_STREAM error */
422static const struct h2s *h2_refused_stream = &(const struct h2s){
423 .cs = NULL,
424 .h2c = NULL,
425 .st = H2_SS_CLOSED,
426 .errcode = H2_ERR_REFUSED_STREAM,
427 .flags = 0,
428 .id = 0,
429};
430
Willy Tarreau2a856182017-05-16 15:20:39 +0200431/* and a dummy idle stream for use with any unannounced stream */
432static const struct h2s *h2_idle_stream = &(const struct h2s){
433 .cs = NULL,
434 .h2c = NULL,
435 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100436 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200437 .id = 0,
438};
439
Olivier Houchard9f6af332018-05-25 14:04:04 +0200440static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200441static int h2_send(struct h2c *h2c);
442static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200443static int h2_process(struct h2c *h2c);
Olivier Houchard29fb89d2018-08-02 18:56:36 +0200444static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100445static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100446static 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 +0100447static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200448static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100449static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100450static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200451
Willy Tarreauab2ec452019-08-30 07:07:08 +0200452/* returns a h2c state as an abbreviated 3-letter string, or "???" if unknown */
453static inline const char *h2c_st_to_str(enum h2_cs st)
454{
455 switch (st) {
456 case H2_CS_PREFACE: return "PRF";
457 case H2_CS_SETTINGS1: return "STG";
458 case H2_CS_FRAME_H: return "FRH";
459 case H2_CS_FRAME_P: return "FRP";
460 case H2_CS_FRAME_A: return "FRA";
461 case H2_CS_FRAME_E: return "FRE";
462 case H2_CS_ERROR: return "ERR";
463 case H2_CS_ERROR2: return "ER2";
464 default: return "???";
465 }
466}
467
468/* returns a h2s state as an abbreviated 3-letter string, or "???" if unknown */
469static inline const char *h2s_st_to_str(enum h2_ss st)
470{
471 switch (st) {
472 case H2_SS_IDLE: return "IDL"; // idle
473 case H2_SS_RLOC: return "RSL"; // reserved local
474 case H2_SS_RREM: return "RSR"; // reserved remote
475 case H2_SS_OPEN: return "OPN"; // open
476 case H2_SS_HREM: return "HCR"; // half-closed remote
477 case H2_SS_HLOC: return "HCL"; // half-closed local
478 case H2_SS_ERROR : return "ERR"; // error
479 case H2_SS_CLOSED: return "CLO"; // closed
480 default: return "???";
481 }
482}
483
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200484/* the H2 traces always expect that arg1, if non-null, is of type connection
485 * (from which we can derive h2c), that arg2, if non-null, is of type h2s, and
486 * that arg3, if non-null, is either of type htx for tx headers, or of type
487 * buffer for everything else.
488 */
489static void h2_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
490 const struct ist where, const struct ist func,
491 const void *a1, const void *a2, const void *a3, const void *a4)
492{
493 const struct connection *conn = a1;
494 const struct h2c *h2c = conn ? conn->ctx : NULL;
495 const struct h2s *h2s = a2;
496 const struct buffer *buf = a3;
497 const struct htx *htx;
498 int pos;
499
500 if (!h2c) // nothing to add
501 return;
502
Willy Tarreau17104d42019-08-30 07:12:55 +0200503 if (src->verbosity > H2_VERB_CLEAN) {
Willy Tarreau73db4342019-09-25 07:28:44 +0200504 chunk_appendf(&trace_buf, " : h2c=%p(%c,%s)", h2c, conn_is_back(conn) ? 'B' : 'F', h2c_st_to_str(h2c->st0));
505
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100506 if (h2c->errcode)
507 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2c->errcode), h2c->errcode);
508
Willy Tarreau73db4342019-09-25 07:28:44 +0200509 if (h2c->dsi >= 0 &&
510 (mask & (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) == (H2_EV_RX_FRAME|H2_EV_RX_FHDR)) {
Willy Tarreau8520d872020-09-18 07:39:29 +0200511 chunk_appendf(&trace_buf, " dft=%s/%02x dfl=%d", h2_ft_str(h2c->dft), h2c->dff, h2c->dfl);
Willy Tarreau73db4342019-09-25 07:28:44 +0200512 }
513
514 if (h2s) {
515 if (h2s->id <= 0)
516 chunk_appendf(&trace_buf, " dsi=%d", h2c->dsi);
517 chunk_appendf(&trace_buf, " h2s=%p(%d,%s)", h2s, h2s->id, h2s_st_to_str(h2s->st));
Willy Tarreauf3ce0412019-11-24 14:57:00 +0100518 if (h2s->id && h2s->errcode)
519 chunk_appendf(&trace_buf, " err=%s/%02x", h2_err_str(h2s->errcode), h2s->errcode);
Willy Tarreau73db4342019-09-25 07:28:44 +0200520 }
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200521 }
522
523 /* Let's dump decoded requests and responses right after parsing. They
524 * are traced at level USER with a few recognizable flags.
525 */
526 if ((mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW) ||
527 mask == (H2_EV_RX_FRAME|H2_EV_RX_HDR)) && buf)
528 htx = htxbuf(buf); // recv req/res
529 else if (mask == (H2_EV_TX_FRAME|H2_EV_TX_HDR))
530 htx = a3; // send req/res
531 else
532 htx = NULL;
533
Willy Tarreau94f1dcf2019-08-30 07:11:30 +0200534 if (level == TRACE_LEVEL_USER && src->verbosity != H2_VERB_MINIMAL && htx && (pos = htx_get_head(htx)) != -1) {
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200535 const struct htx_blk *blk = htx_get_blk(htx, pos);
536 const struct htx_sl *sl = htx_get_blk_ptr(htx, blk);
537 enum htx_blk_type type = htx_get_blk_type(blk);
538
539 if (type == HTX_BLK_REQ_SL)
540 chunk_appendf(&trace_buf, " : [%d] H2 REQ: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200541 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200542 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
543 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
544 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
545 else if (type == HTX_BLK_RES_SL)
546 chunk_appendf(&trace_buf, " : [%d] H2 RES: %.*s %.*s %.*s",
Willy Tarreauc067a3a2019-08-30 07:28:24 +0200547 h2s ? h2s->id : h2c->dsi,
Willy Tarreaudb3cfff2019-08-19 17:56:27 +0200548 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
549 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
550 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
551 }
552}
553
Christopher Fauletaade4ed2020-10-08 15:38:41 +0200554
555/* Detect a pending read0 for a H2 connection. It happens if a read0 is pending
556 * on the connection AND if there is no more data in the demux buffer. The
557 * function returns 1 to report a read0 or 0 otherwise.
558 */
559static int h2c_read0_pending(struct h2c *h2c)
560{
561 if (conn_xprt_read0_pending(h2c->conn) && !b_data(&h2c->dbuf))
562 return 1;
563 return 0;
564}
565
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200566/* returns true if the connection is allowed to expire, false otherwise. A
567 * connection may expire when:
568 * - it has no stream
569 * - it has data in the mux buffer
570 * - it has streams in the blocked list
571 * - it has streams in the fctl list
572 * - it has streams in the send list
573 * Otherwise it means some streams are waiting in the data layer and it should
574 * not expire.
575 */
576static inline int h2c_may_expire(const struct h2c *h2c)
577{
578 return eb_is_empty(&h2c->streams_by_id) ||
579 br_data(h2c->mbuf) ||
580 !LIST_ISEMPTY(&h2c->blocked_list) ||
581 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100582 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200583}
584
Olivier Houchard7a977432019-03-21 15:47:13 +0100585static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200586h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100587{
588 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
589 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
590 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
591 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200592 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100593 (conn_xprt_read0_pending(h2c->conn) ||
594 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
595 return 1;
596
597 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100598}
599
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200600/*****************************************************/
601/* functions below are for dynamic buffer management */
602/*****************************************************/
603
Willy Tarreau315d8072017-12-10 22:17:57 +0100604/* indicates whether or not the we may call the h2_recv() function to attempt
605 * to receive data into the buffer and/or demux pending data. The condition is
606 * a bit complex due to some API limits for now. The rules are the following :
607 * - if an error or a shutdown was detected on the connection and the buffer
608 * is empty, we must not attempt to receive
609 * - if the demux buf failed to be allocated, we must not try to receive and
610 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100611 * - if no flag indicates a blocking condition, we may attempt to receive,
612 * regardless of whether the demux buffer is full or not, so that only
613 * de demux part decides whether or not to block. This is needed because
614 * the connection API indeed prevents us from re-enabling receipt that is
615 * already enabled in a polled state, so we must always immediately stop
616 * as soon as the demux can't proceed so as never to hit an end of read
617 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100618 * - otherwise must may not attempt
619 */
620static inline int h2_recv_allowed(const struct h2c *h2c)
621{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200622 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100623 (h2c->st0 >= H2_CS_ERROR ||
624 h2c->conn->flags & CO_FL_ERROR ||
625 conn_xprt_read0_pending(h2c->conn)))
626 return 0;
627
628 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100629 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100630 return 1;
631
632 return 0;
633}
634
Willy Tarreau47b515a2018-12-21 16:09:41 +0100635/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200636static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100637{
638 if (!h2_recv_allowed(h2c))
639 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200640 if ((!consider_buffer || !b_data(&h2c->dbuf))
641 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100642 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200643 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100644}
645
646
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100647/* returns true if the front connection has too many conn_streams attached */
648static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200649{
Willy Tarreaua8754662018-12-23 20:43:58 +0100650 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200651}
652
Willy Tarreau44e973f2018-03-01 17:49:30 +0100653/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
654 * flags are used to figure what buffer was requested. It returns 1 if the
655 * allocation succeeds, in which case the connection is woken up, or 0 if it's
656 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200657 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100658static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200659{
660 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100661 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200662
Willy Tarreau44e973f2018-03-01 17:49:30 +0100663 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200664 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200665 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200666 return 1;
667 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200668
Willy Tarreau51330962019-05-26 09:38:07 +0200669 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100670 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200671
672 if (h2c->flags & H2_CF_DEM_MROOM) {
673 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200674 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200675 }
Willy Tarreau14398122017-09-22 14:26:04 +0200676 return 1;
677 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100678
679 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
680 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200681 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100682 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200683 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100684 return 1;
685 }
686
Willy Tarreau14398122017-09-22 14:26:04 +0200687 return 0;
688}
689
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200690static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200691{
692 struct buffer *buf = NULL;
693
Willy Tarreau21046592020-02-26 10:39:36 +0100694 if (likely(!MT_LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100695 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
696 h2c->buf_wait.target = h2c;
697 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau86891272020-07-10 08:22:26 +0200698 MT_LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200699 }
700 return buf;
701}
702
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200703static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200704{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200705 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100706 b_free(bptr);
Willy Tarreau201840a2019-05-29 17:50:48 +0200707 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200708 }
709}
710
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200711static inline void h2_release_mbuf(struct h2c *h2c)
712{
713 struct buffer *buf;
714 unsigned int count = 0;
715
716 while (b_size(buf = br_head_pick(h2c->mbuf))) {
717 b_free(buf);
718 count++;
719 }
720 if (count)
Willy Tarreau201840a2019-05-29 17:50:48 +0200721 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200722}
723
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100724/* returns the number of allocatable outgoing streams for the connection taking
725 * the last_sid and the reserved ones into account.
726 */
727static inline int h2_streams_left(const struct h2c *h2c)
728{
729 int ret;
730
731 /* consider the number of outgoing streams we're allowed to create before
732 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
733 * nb_reserved is the number of streams which don't yet have an ID.
734 */
735 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
736 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
737 if (ret < 0)
738 ret = 0;
739 return ret;
740}
741
Willy Tarreau00f18a32019-01-26 12:19:01 +0100742/* returns the number of streams in use on a connection to figure if it's
743 * idle or not. We check nb_cs and not nb_streams as the caller will want
744 * to know if it was the last one after a detach().
745 */
746static int h2_used_streams(struct connection *conn)
747{
748 struct h2c *h2c = conn->ctx;
749
750 return h2c->nb_cs;
751}
752
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100753/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100754static int h2_avail_streams(struct connection *conn)
755{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100756 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100757 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100758 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100759
Willy Tarreau6afec462019-01-28 06:40:19 +0100760 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
761 * streams on the connection.
762 */
763 if (h2c->last_sid >= 0)
764 return 0;
765
Willy Tarreauc61966f2019-10-31 15:10:03 +0100766 if (h2c->st0 >= H2_CS_ERROR)
767 return 0;
768
Willy Tarreau86949782019-01-31 10:42:05 +0100769 /* note: may be negative if a SETTINGS frame changes the limit */
770 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100771
772 /* we must also consider the limit imposed by stream IDs */
773 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100774 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100775 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100776 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
777 ret1 = MIN(ret1, ret2);
778 }
779 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100780}
781
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200782
Willy Tarreau62f52692017-10-08 23:01:42 +0200783/*****************************************************************/
784/* functions below are dedicated to the mux setup and management */
785/*****************************************************************/
786
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200787/* Initialize the mux once it's attached. For outgoing connections, the context
788 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200789 * connections from the fact that the context is still NULL (even during mux
790 * upgrades). <input> is always used as Input buffer and may contain data. It is
791 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200792 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200793static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
794 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200795{
796 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100797 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200798 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200799
Christopher Fauletf81ef032019-10-04 15:19:43 +0200800 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200801
Willy Tarreaubafbe012017-11-24 17:34:44 +0100802 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200803 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200804 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200805
Christopher Faulete9b70722019-04-08 10:46:02 +0200806 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200807 h2c->flags = H2_CF_IS_BACK;
808 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
809 if (tick_isset(prx->timeout.serverfin))
810 h2c->shut_timeout = prx->timeout.serverfin;
811 } else {
812 h2c->flags = H2_CF_NONE;
813 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
814 if (tick_isset(prx->timeout.clientfin))
815 h2c->shut_timeout = prx->timeout.clientfin;
816 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100817
Willy Tarreau0b37d652018-10-03 10:33:02 +0200818 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100819 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100820 if (tick_isset(h2c->timeout)) {
821 t = task_new(tid_bit);
822 if (!t)
823 goto fail;
824
825 h2c->task = t;
826 t->process = h2_timeout_task;
827 t->context = h2c;
828 t->expire = tick_add(now_ms, h2c->timeout);
829 }
Willy Tarreauea392822017-10-31 10:02:25 +0100830
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200831 h2c->wait_event.tasklet = tasklet_new();
832 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200833 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200834 h2c->wait_event.tasklet->process = h2_io_cb;
835 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100836 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200837
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200838 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200839 if (!h2c->ddht)
840 goto fail;
841
842 /* Initialise the context. */
843 h2c->st0 = H2_CS_PREFACE;
844 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100845 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200846 h2c->max_id = -1;
847 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100848 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200849 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100850 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200851 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100852 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100853 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200854
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200855 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200856 h2c->dsi = -1;
857 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100858
Willy Tarreau32218eb2017-09-22 08:07:25 +0200859 h2c->last_sid = -1;
860
Willy Tarreau51330962019-05-26 09:38:07 +0200861 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200862 h2c->miw = 65535; /* mux initial window size */
863 h2c->mws = 65535; /* mux window size */
864 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200865 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200866 LIST_INIT(&h2c->send_list);
867 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200868 LIST_INIT(&h2c->blocked_list);
Willy Tarreau21046592020-02-26 10:39:36 +0100869 MT_LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200870
Christopher Fauletf81ef032019-10-04 15:19:43 +0200871 conn->ctx = h2c;
872
Willy Tarreau3f133572017-10-31 19:21:06 +0100873 if (t)
874 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100875
Willy Tarreau01b44822018-10-03 14:26:37 +0200876 if (h2c->flags & H2_CF_IS_BACK) {
877 /* FIXME: this is temporary, for outgoing connections we need
878 * to immediately allocate a stream until the code is modified
879 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +0200880 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +0200881 */
882 struct h2s *h2s;
883
Christopher Fauletf81ef032019-10-04 15:19:43 +0200884 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200885 if (!h2s)
886 goto fail_stream;
887 }
888
Willy Tarreau0f383582018-10-03 14:22:21 +0200889 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200890 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +0200891 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200892 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +0200893 fail_stream:
894 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +0200895 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +0200896 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200897 if (h2c->wait_event.tasklet)
898 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +0100899 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +0200900 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +0200901 conn->ctx = conn_ctx; /* restore saved ctx */
902 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200903 return -1;
904}
905
Willy Tarreau751f2d02018-10-05 09:35:00 +0200906/* returns the next allocatable outgoing stream ID for the H2 connection, or
907 * -1 if no more is allocatable.
908 */
909static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
910{
911 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +0100912
913 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +0200914 id = -1;
915 return id;
916}
917
Willy Tarreau2373acc2017-10-12 17:35:14 +0200918/* returns the stream associated with id <id> or NULL if not found */
919static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
920{
921 struct eb32_node *node;
922
Willy Tarreau751f2d02018-10-05 09:35:00 +0200923 if (id == 0)
924 return (struct h2s *)h2_closed_stream;
925
Willy Tarreau2a856182017-05-16 15:20:39 +0200926 if (id > h2c->max_id)
927 return (struct h2s *)h2_idle_stream;
928
Willy Tarreau2373acc2017-10-12 17:35:14 +0200929 node = eb32_lookup(&h2c->streams_by_id, id);
930 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +0200931 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +0200932
933 return container_of(node, struct h2s, by_id);
934}
935
Christopher Faulet73c12072019-04-08 11:23:22 +0200936/* release function. This one should be called to free all resources allocated
937 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +0200938 */
Christopher Faulet73c12072019-04-08 11:23:22 +0200939static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +0200940{
William Dauchy477757c2020-08-07 22:19:23 +0200941 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200942
Willy Tarreau7838a792019-08-12 18:42:03 +0200943 TRACE_ENTER(H2_EV_H2C_END);
944
Willy Tarreau32218eb2017-09-22 08:07:25 +0200945 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +0200946 /* The connection must be aattached to this mux to be released */
947 if (h2c->conn && h2c->conn->ctx == h2c)
948 conn = h2c->conn;
949
Willy Tarreau7838a792019-08-12 18:42:03 +0200950 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200951 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +0200952
Willy Tarreau21046592020-02-26 10:39:36 +0100953 if (MT_LIST_ADDED(&h2c->buf_wait.list))
954 MT_LIST_DEL(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200955
Willy Tarreau44e973f2018-03-01 17:49:30 +0100956 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200957 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100958
Willy Tarreauea392822017-10-31 10:02:25 +0100959 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +0200960 h2c->task->context = NULL;
961 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +0100962 h2c->task = NULL;
963 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200964 if (h2c->wait_event.tasklet)
965 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +0200966 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +0100967 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +0200968 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +0100969
Willy Tarreaubafbe012017-11-24 17:34:44 +0100970 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200971 }
972
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200973 if (conn) {
974 conn->mux = NULL;
975 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +0200976 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200977
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200978 conn_stop_tracking(conn);
979 conn_full_close(conn);
980 if (conn->destroy_cb)
981 conn->destroy_cb(conn);
982 conn_free(conn);
983 }
Willy Tarreau7838a792019-08-12 18:42:03 +0200984
985 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +0200986}
987
988
Willy Tarreau71681172017-10-23 14:39:06 +0200989/******************************************************/
990/* functions below are for the H2 protocol processing */
991/******************************************************/
992
993/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +0100994static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +0200995{
996 return h2s ? h2s->id : 0;
997}
998
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200999/* returns the sum of the stream's own window size and the mux's initial
1000 * window, which together form the stream's effective window size.
1001 */
1002static inline int h2s_mws(const struct h2s *h2s)
1003{
1004 return h2s->sws + h2s->h2c->miw;
1005}
1006
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001007/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001008static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +02001009{
1010 if (h2c->msi < 0)
1011 return 0;
1012
1013 if (h2c->msi == h2s_id(h2s))
1014 return 0;
1015
1016 return 1;
1017}
1018
Willy Tarreau741d6df2017-10-17 08:00:59 +02001019/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001020static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001021{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001022 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001023 h2c->errcode = err;
1024 h2c->st0 = H2_CS_ERROR;
1025}
1026
Willy Tarreau175cebb2019-01-24 10:02:24 +01001027/* marks an error on the stream. It may also update an already closed stream
1028 * (e.g. to report an error after an RST was received).
1029 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001030static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001031{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001032 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001033 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001034 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001035 if (h2s->st < H2_SS_ERROR)
1036 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001037 if (h2s->cs)
1038 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001039 }
1040}
1041
Willy Tarreau7e094452018-12-19 18:08:52 +01001042/* attempt to notify the data layer of recv availability */
1043static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1044{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001045 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001046 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001047 tasklet_wakeup(h2s->subs->tasklet);
1048 h2s->subs->events &= ~SUB_RETRY_RECV;
1049 if (!h2s->subs->events)
1050 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001051 }
1052}
1053
1054/* attempt to notify the data layer of send availability */
1055static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1056{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001057 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001058 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001059 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001060 tasklet_wakeup(h2s->subs->tasklet);
1061 h2s->subs->events &= ~SUB_RETRY_SEND;
1062 if (!h2s->subs->events)
1063 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001064 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001065 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1066 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1067 tasklet_wakeup(h2s->shut_tl);
1068 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001069}
1070
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001071/* alerts the data layer, trying to wake it up by all means, following
1072 * this sequence :
1073 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1074 * - if its subscribed to send, then it's woken up for send
1075 * - if it was subscribed to neither, its ->wake() callback is called
1076 * It is safe to call this function with a closed stream which doesn't have a
1077 * conn_stream anymore.
1078 */
1079static void __maybe_unused h2s_alert(struct h2s *h2s)
1080{
Willy Tarreau7838a792019-08-12 18:42:03 +02001081 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1082
Willy Tarreauf96508a2020-01-10 11:12:48 +01001083 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001084 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001085 h2s_notify_recv(h2s);
1086 h2s_notify_send(h2s);
1087 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001088 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1089 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001090 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001091 }
1092
1093 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001094}
1095
Willy Tarreaue4820742017-07-27 13:37:23 +02001096/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001097static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001098{
1099 uint8_t *out = frame;
1100
1101 *out = len >> 16;
1102 write_n16(out + 1, len);
1103}
1104
Willy Tarreau54c15062017-10-10 17:10:03 +02001105/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1106 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1107 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001108 * available in the buffer's input prior to calling this function. The buffer
1109 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001110 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001111static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001112 const struct buffer *b, int o)
1113{
Willy Tarreau591d4452018-06-15 17:21:00 +02001114 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 +02001115}
1116
Willy Tarreau1f094672017-11-20 21:27:45 +01001117static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001118{
Willy Tarreau591d4452018-06-15 17:21:00 +02001119 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001120}
1121
Willy Tarreau1f094672017-11-20 21:27:45 +01001122static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001123{
Willy Tarreau591d4452018-06-15 17:21:00 +02001124 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001125}
1126
Willy Tarreau1f094672017-11-20 21:27:45 +01001127static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001128{
Willy Tarreau591d4452018-06-15 17:21:00 +02001129 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001130}
1131
1132
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001133/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1134 * The algorithm is not obvious. It turns out that H2 headers are neither
1135 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1136 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001137 *
1138 * b0 b1 b2 b3 b4 b5..b8
1139 * +----------+---------+--------+----+----+----------------------+
1140 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1141 * +----------+---------+--------+----+----+----------------------+
1142 *
1143 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1144 * we get the sid properly aligned and ordered, and 16 bits of len properly
1145 * ordered as well. The type and flags can be extracted using bit shifts from
1146 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001147 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1148 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001149 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001150static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001151{
1152 uint64_t w;
1153
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001154 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001155 return 0;
1156
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001157 w = h2_get_n64(b, o + 1);
1158 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001159 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1160 h->ff = w >> 32;
1161 h->ft = w >> 40;
1162 h->len += w >> 48;
1163 return 1;
1164}
1165
1166/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1167 * h2_peek_frame_hdr() above.
1168 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001169static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001170{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001171 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001172}
1173
1174/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001175static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001176{
1177 int ret;
1178
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001179 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001180 if (ret > 0)
1181 h2_skip_frame_hdr(b);
1182 return ret;
1183}
1184
Willy Tarreaucb985a42019-10-07 16:56:34 +02001185
1186/* try to fragment the headers frame present at the beginning of buffer <b>,
1187 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1188 * success. Typical causes of failure include a buffer not large enough to
1189 * add extra frame headers. The existing frame size is read in the current
1190 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1191 * and its length will be adjusted. The stream ID for continuation frames will
1192 * be copied from the initial frame's.
1193 */
1194static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1195{
1196 size_t remain = b->data - 9;
1197 int extra_frames = (remain - 1) / mfs;
1198 size_t fsize;
1199 char *fptr;
1200 int frame;
1201
1202 if (b->data <= mfs + 9)
1203 return 1;
1204
1205 /* Too large a frame, we need to fragment it using CONTINUATION
1206 * frames. We start from the end and move tails as needed.
1207 */
1208 if (b->data + extra_frames * 9 > b->size)
1209 return 0;
1210
1211 for (frame = extra_frames; frame; frame--) {
1212 fsize = ((remain - 1) % mfs) + 1;
1213 remain -= fsize;
1214
1215 /* move data */
1216 fptr = b->area + 9 + remain + (frame - 1) * 9;
1217 memmove(fptr + 9, b->area + 9 + remain, fsize);
1218 b->data += 9;
1219
1220 /* write new frame header */
1221 h2_set_frame_size(fptr, fsize);
1222 fptr[3] = H2_FT_CONTINUATION;
1223 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1224 write_n32(fptr + 5, read_n32(b->area + 5));
1225 }
1226
1227 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1228 h2_set_frame_size(b->area, remain);
1229 return 1;
1230}
1231
1232
Willy Tarreau00dd0782018-03-01 16:31:34 +01001233/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1234 * its connection if the stream was not yet closed. Please use this exclusively
1235 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001236 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001237static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001238{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001239 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001240 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001241 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001242 if (!h2s->id)
1243 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001244 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001245 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1246 h2s_notify_recv(h2s);
1247 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001248 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001249 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001250 h2s->st = H2_SS_CLOSED;
1251}
1252
Willy Tarreau71049cc2018-03-28 13:56:39 +02001253/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001254/* h2s_destroy should only ever be called by the thread that owns the stream,
1255 * that means that a tasklet should be used if we want to destroy the h2s
1256 * from another thread
1257 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001258static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001259{
Willy Tarreau7838a792019-08-12 18:42:03 +02001260 struct connection *conn = h2s->h2c->conn;
1261
1262 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1263
Willy Tarreau0a10de62018-03-01 16:27:53 +01001264 h2s_close(h2s);
1265 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001266 if (b_size(&h2s->rxbuf)) {
1267 b_free(&h2s->rxbuf);
1268 offer_buffers(NULL, tasks_run_queue);
1269 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001270
1271 if (h2s->subs)
1272 h2s->subs->events = 0;
1273
Joseph Herlantd77575d2018-11-25 10:54:45 -08001274 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001275 * reference left would be in the h2c send_list/fctl_list, and if
1276 * we're in it, we're getting out anyway
1277 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001278 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001279
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001280 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001281 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001282 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001283
1284 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001285}
1286
Willy Tarreaua8e49542018-10-03 18:53:55 +02001287/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1288 * stream tree. In case of error, nothing is added and NULL is returned. The
1289 * causes of errors can be any failed memory allocation. The caller is
1290 * responsible for checking if the connection may support an extra stream
1291 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001292 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001293static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001294{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001295 struct h2s *h2s;
1296
Willy Tarreau7838a792019-08-12 18:42:03 +02001297 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1298
Willy Tarreaubafbe012017-11-24 17:34:44 +01001299 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001300 if (!h2s)
1301 goto out;
1302
Willy Tarreau5723f292020-01-10 15:16:57 +01001303 h2s->shut_tl = tasklet_new();
1304 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001305 pool_free(pool_head_h2s, h2s);
1306 goto out;
1307 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001308 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001309 h2s->shut_tl->process = h2_deferred_shut;
1310 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001311 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001312 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001313 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001314 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001315 h2s->flags = H2_SF_NONE;
1316 h2s->errcode = H2_ERR_NO_ERROR;
1317 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001318 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001319 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001320 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001321
1322 if (h2c->flags & H2_CF_IS_BACK) {
1323 h1m_init_req(&h2s->h1m);
1324 h2s->h1m.err_pos = -1; // don't care about errors on the request path
1325 h2s->h1m.flags |= H1_MF_TOLOWER;
1326 } else {
1327 h1m_init_res(&h2s->h1m);
1328 h2s->h1m.err_pos = -1; // don't care about errors on the response path
1329 h2s->h1m.flags |= H1_MF_TOLOWER;
1330 }
1331
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001332 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001333 if (id > 0)
1334 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001335 else
1336 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001337
1338 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001339 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001340 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001341
Willy Tarreau7838a792019-08-12 18:42:03 +02001342 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001343 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001344 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001345 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001346 return NULL;
1347}
1348
1349/* creates a new stream <id> on the h2c connection and returns it, or NULL in
1350 * case of memory allocation error.
1351 */
1352static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
1353{
1354 struct session *sess = h2c->conn->owner;
1355 struct conn_stream *cs;
1356 struct h2s *h2s;
1357
Willy Tarreau7838a792019-08-12 18:42:03 +02001358 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1359
Willy Tarreaua8e49542018-10-03 18:53:55 +02001360 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1361 goto out;
1362
1363 h2s = h2s_new(h2c, id);
1364 if (!h2s)
1365 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001366
Christopher Faulet236c93b2020-07-02 09:19:54 +02001367 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001368 if (!cs)
1369 goto out_close;
1370
Olivier Houchard746fb772018-12-15 19:42:00 +01001371 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001372 h2s->cs = cs;
1373 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001374 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001375
1376 if (stream_create_from_cs(cs) < 0)
1377 goto out_free_cs;
1378
Willy Tarreau590a0512018-09-05 11:56:48 +02001379 /* We want the accept date presented to the next stream to be the one
1380 * we have now, the handshake time to be null (since the next stream
1381 * is not delayed by a handshake), and the idle time to count since
1382 * right now.
1383 */
1384 sess->accept_date = date;
1385 sess->tv_accept = now;
1386 sess->t_handshake = 0;
1387
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001388 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001389 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001390 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001391 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001392 return h2s;
1393
1394 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001395 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001396 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001397 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001398 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001399 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001400 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001401 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001402 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001403 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001404}
1405
Willy Tarreau751f2d02018-10-05 09:35:00 +02001406/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1407 * and returns it, or NULL in case of memory allocation error or if the highest
1408 * possible stream ID was reached.
1409 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001410static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001411{
1412 struct h2s *h2s = NULL;
1413
Willy Tarreau7838a792019-08-12 18:42:03 +02001414 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1415
Willy Tarreau86949782019-01-31 10:42:05 +01001416 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001417 goto out;
1418
Willy Tarreaua80dca82019-01-24 17:08:28 +01001419 if (h2_streams_left(h2c) < 1)
1420 goto out;
1421
Willy Tarreau751f2d02018-10-05 09:35:00 +02001422 /* Defer choosing the ID until we send the first message to create the stream */
1423 h2s = h2s_new(h2c, 0);
1424 if (!h2s)
1425 goto out;
1426
1427 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001428 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001429 cs->ctx = h2s;
1430 h2c->nb_cs++;
1431
Willy Tarreau751f2d02018-10-05 09:35:00 +02001432 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001433 if (likely(h2s))
1434 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1435 else
1436 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001437 return h2s;
1438}
1439
Willy Tarreaube5b7152017-09-25 16:25:39 +02001440/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1441 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1442 * the various settings codes.
1443 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001444static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001445{
1446 struct buffer *res;
1447 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001448 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001449 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001450 int ret = 0;
1451
1452 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001453
1454 if (h2c_mux_busy(h2c, NULL)) {
1455 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001456 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001457 }
1458
Willy Tarreaube5b7152017-09-25 16:25:39 +02001459 chunk_init(&buf, buf_data, sizeof(buf_data));
1460 chunk_memcpy(&buf,
1461 "\x00\x00\x00" /* length : 0 for now */
1462 "\x04\x00" /* type : 4 (settings), flags : 0 */
1463 "\x00\x00\x00\x00", /* stream ID : 0 */
1464 9);
1465
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001466 if (h2c->flags & H2_CF_IS_BACK) {
1467 /* send settings_enable_push=0 */
1468 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1469 }
1470
Willy Tarreaube5b7152017-09-25 16:25:39 +02001471 if (h2_settings_header_table_size != 4096) {
1472 char str[6] = "\x00\x01"; /* header_table_size */
1473
1474 write_n32(str + 2, h2_settings_header_table_size);
1475 chunk_memcat(&buf, str, 6);
1476 }
1477
1478 if (h2_settings_initial_window_size != 65535) {
1479 char str[6] = "\x00\x04"; /* initial_window_size */
1480
1481 write_n32(str + 2, h2_settings_initial_window_size);
1482 chunk_memcat(&buf, str, 6);
1483 }
1484
1485 if (h2_settings_max_concurrent_streams != 0) {
1486 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1487
1488 /* Note: 0 means "unlimited" for haproxy's config but not for
1489 * the protocol, so never send this value!
1490 */
1491 write_n32(str + 2, h2_settings_max_concurrent_streams);
1492 chunk_memcat(&buf, str, 6);
1493 }
1494
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001495 mfs = h2_settings_max_frame_size;
1496 if (mfs > global.tune.bufsize)
1497 mfs = global.tune.bufsize;
1498
1499 if (!mfs)
1500 mfs = global.tune.bufsize;
1501
1502 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001503 char str[6] = "\x00\x05"; /* max_frame_size */
1504
1505 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1506 * match bufsize - rewrite size, but at the moment it seems
1507 * that clients don't take care of it.
1508 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001509 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001510 chunk_memcat(&buf, str, 6);
1511 }
1512
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001513 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001514
1515 res = br_tail(h2c->mbuf);
1516 retry:
1517 if (!h2_get_buf(h2c, res)) {
1518 h2c->flags |= H2_CF_MUX_MALLOC;
1519 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001520 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001521 }
1522
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001523 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001524 if (unlikely(ret <= 0)) {
1525 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001526 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1527 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001528 h2c->flags |= H2_CF_MUX_MFULL;
1529 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001530 }
1531 else {
1532 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001533 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001534 }
1535 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001536 out:
1537 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001538 return ret;
1539}
1540
Willy Tarreau52eed752017-09-22 15:05:09 +02001541/* Try to receive a connection preface, then upon success try to send our
1542 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1543 * missing data. It may return an error in h2c.
1544 */
1545static int h2c_frt_recv_preface(struct h2c *h2c)
1546{
1547 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001548 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001549
Willy Tarreau7838a792019-08-12 18:42:03 +02001550 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1551
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001552 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001553
1554 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001555 if (ret1 < 0)
1556 sess_log(h2c->conn->owner);
1557
Willy Tarreau52eed752017-09-22 15:05:09 +02001558 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn))
1559 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001560 ret2 = 0;
1561 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001562 }
1563
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001564 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001565 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001566 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001567 out:
1568 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001569 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001570}
1571
Willy Tarreau01b44822018-10-03 14:26:37 +02001572/* Try to send a connection preface, then upon success try to send our
1573 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1574 * missing data. It may return an error in h2c.
1575 */
1576static int h2c_bck_send_preface(struct h2c *h2c)
1577{
1578 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001579 int ret = 0;
1580
1581 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001582
1583 if (h2c_mux_busy(h2c, NULL)) {
1584 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001585 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001586 }
1587
Willy Tarreaubcc45952019-05-26 10:05:50 +02001588 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001589 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001590 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001591 h2c->flags |= H2_CF_MUX_MALLOC;
1592 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001593 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001594 }
1595
1596 if (!b_data(res)) {
1597 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001598 ret = b_istput(res, ist(H2_CONN_PREFACE));
1599 if (unlikely(ret <= 0)) {
1600 if (!ret) {
1601 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1602 goto retry;
1603 h2c->flags |= H2_CF_MUX_MFULL;
1604 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001605 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001606 }
1607 else {
1608 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001609 ret = 0;
1610 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001611 }
1612 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001613 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001614 ret = h2c_send_settings(h2c);
1615 out:
1616 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1617 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001618}
1619
Willy Tarreau081d4722017-05-16 21:51:05 +02001620/* try to send a GOAWAY frame on the connection to report an error or a graceful
1621 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1622 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1623 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1624 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1625 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1626 * on unrecoverable failure. It will not attempt to send one again in this last
1627 * case so that it is safe to use h2c_error() to report such errors.
1628 */
1629static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1630{
1631 struct buffer *res;
1632 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001633 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001634
Willy Tarreau7838a792019-08-12 18:42:03 +02001635 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1636
1637 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1638 ret = 1; // claim that it worked
1639 goto out;
1640 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001641
1642 if (h2c_mux_busy(h2c, h2s)) {
1643 if (h2s)
1644 h2s->flags |= H2_SF_BLK_MBUSY;
1645 else
1646 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001647 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001648 }
1649
Willy Tarreau9c218e72019-05-26 10:08:28 +02001650 /* len: 8, type: 7, flags: none, sid: 0 */
1651 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1652
1653 if (h2c->last_sid < 0)
1654 h2c->last_sid = h2c->max_id;
1655
1656 write_n32(str + 9, h2c->last_sid);
1657 write_n32(str + 13, h2c->errcode);
1658
Willy Tarreaubcc45952019-05-26 10:05:50 +02001659 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001660 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001661 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001662 h2c->flags |= H2_CF_MUX_MALLOC;
1663 if (h2s)
1664 h2s->flags |= H2_SF_BLK_MROOM;
1665 else
1666 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001667 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001668 }
1669
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001670 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001671 if (unlikely(ret <= 0)) {
1672 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001673 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1674 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001675 h2c->flags |= H2_CF_MUX_MFULL;
1676 if (h2s)
1677 h2s->flags |= H2_SF_BLK_MROOM;
1678 else
1679 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001680 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001681 }
1682 else {
1683 /* we cannot report this error using GOAWAY, so we mark
1684 * it and claim a success.
1685 */
1686 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1687 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001688 ret = 1;
1689 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001690 }
1691 }
1692 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02001693 out:
1694 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001695 return ret;
1696}
1697
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001698/* Try to send an RST_STREAM frame on the connection for the indicated stream
1699 * during mux operations. This stream must be valid and cannot be closed
1700 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1701 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1702 * not yet.
1703 *
1704 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1705 * to write the message, it subscribes the stream to future notifications.
1706 */
1707static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1708{
1709 struct buffer *res;
1710 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001711 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001712
Willy Tarreau7838a792019-08-12 18:42:03 +02001713 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1714
1715 if (!h2s || h2s->st == H2_SS_CLOSED) {
1716 ret = 1;
1717 goto out;
1718 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001719
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001720 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1721 * RST_STREAM in response to a RST_STREAM frame.
1722 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001723 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001724 ret = 1;
1725 goto ignore;
1726 }
1727
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001728 if (h2c_mux_busy(h2c, h2s)) {
1729 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001730 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001731 }
1732
Willy Tarreau9c218e72019-05-26 10:08:28 +02001733 /* len: 4, type: 3, flags: none */
1734 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1735 write_n32(str + 5, h2s->id);
1736 write_n32(str + 9, h2s->errcode);
1737
Willy Tarreaubcc45952019-05-26 10:05:50 +02001738 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001739 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001740 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001741 h2c->flags |= H2_CF_MUX_MALLOC;
1742 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001743 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001744 }
1745
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001746 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001747 if (unlikely(ret <= 0)) {
1748 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001749 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1750 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001751 h2c->flags |= H2_CF_MUX_MFULL;
1752 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001753 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001754 }
1755 else {
1756 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001757 ret = 0;
1758 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001759 }
1760 }
1761
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001762 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001763 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001764 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001765 out:
1766 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001767 return ret;
1768}
1769
1770/* Try to send an RST_STREAM frame on the connection for the stream being
1771 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001772 * error code, even if the stream is one of the dummy ones, and will update
1773 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001774 *
1775 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1776 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001777 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001778 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001779 */
1780static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1781{
1782 struct buffer *res;
1783 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001784 int ret = 0;
1785
1786 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001787
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001788 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1789 * RST_STREAM in response to a RST_STREAM frame.
1790 */
1791 if (h2c->dft == H2_FT_RST_STREAM) {
1792 ret = 1;
1793 goto ignore;
1794 }
1795
Willy Tarreau27a84c92017-10-17 08:10:17 +02001796 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001797 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001798 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001799 }
1800
Willy Tarreau9c218e72019-05-26 10:08:28 +02001801 /* len: 4, type: 3, flags: none */
1802 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1803
1804 write_n32(str + 5, h2c->dsi);
1805 write_n32(str + 9, h2s->errcode);
1806
Willy Tarreaubcc45952019-05-26 10:05:50 +02001807 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001808 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001809 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001810 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001811 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001812 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001813 }
1814
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001815 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001816 if (unlikely(ret <= 0)) {
1817 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001818 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1819 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001820 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001821 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001822 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001823 }
1824 else {
1825 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001826 ret = 0;
1827 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001828 }
1829 }
1830
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001831 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001832 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001833 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001834 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001835 }
1836
Willy Tarreau7838a792019-08-12 18:42:03 +02001837 out:
1838 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001839 return ret;
1840}
1841
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001842/* try to send an empty DATA frame with the ES flag set to notify about the
1843 * end of stream and match a shutdown(write). If an ES was already sent as
1844 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1845 * on success or zero if nothing was done. In case of lack of room to write the
1846 * message, it subscribes the requesting stream to future notifications.
1847 */
1848static int h2_send_empty_data_es(struct h2s *h2s)
1849{
1850 struct h2c *h2c = h2s->h2c;
1851 struct buffer *res;
1852 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001853 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001854
Willy Tarreau7838a792019-08-12 18:42:03 +02001855 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1856
1857 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1858 ret = 1;
1859 goto out;
1860 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001861
1862 if (h2c_mux_busy(h2c, h2s)) {
1863 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001864 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001865 }
1866
Willy Tarreau9c218e72019-05-26 10:08:28 +02001867 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1868 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1869 write_n32(str + 5, h2s->id);
1870
Willy Tarreaubcc45952019-05-26 10:05:50 +02001871 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001872 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001873 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001874 h2c->flags |= H2_CF_MUX_MALLOC;
1875 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001876 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001877 }
1878
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001879 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001880 if (likely(ret > 0)) {
1881 h2s->flags |= H2_SF_ES_SENT;
1882 }
1883 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001884 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1885 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001886 h2c->flags |= H2_CF_MUX_MFULL;
1887 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001888 }
1889 else {
1890 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001891 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001892 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001893 out:
1894 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001895 return ret;
1896}
1897
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05001898/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02001899 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001900 * is automatically updated accordingly. If the stream is orphaned, it is
1901 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01001902 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001903static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01001904{
Willy Tarreau7838a792019-08-12 18:42:03 +02001905 struct h2c *h2c = h2s->h2c;
1906
1907 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
1908
Christopher Fauletf02ca002019-03-07 16:21:34 +01001909 if (!h2s->cs) {
1910 /* this stream was already orphaned */
1911 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001912 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001913 return;
1914 }
1915
Christopher Fauletaade4ed2020-10-08 15:38:41 +02001916 if (h2c_read0_pending(h2s->h2c)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001917 if (h2s->st == H2_SS_OPEN)
1918 h2s->st = H2_SS_HREM;
1919 else if (h2s->st == H2_SS_HLOC)
1920 h2s_close(h2s);
1921 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001922
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001923 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
1924 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
1925 h2s->cs->flags |= CS_FL_ERR_PENDING;
1926 if (h2s->cs->flags & CS_FL_EOS)
1927 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02001928
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001929 if (h2s->st < H2_SS_ERROR)
1930 h2s->st = H2_SS_ERROR;
1931 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01001932
1933 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001934 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001935}
1936
1937/* wake the streams attached to the connection, whose id is greater than <last>
1938 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001939 */
Willy Tarreau23482912019-05-07 15:23:14 +02001940static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001941{
1942 struct eb32_node *node;
1943 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001944
Willy Tarreau7838a792019-08-12 18:42:03 +02001945 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
1946
Christopher Fauletf02ca002019-03-07 16:21:34 +01001947 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001948 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
1949 while (node) {
1950 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001951 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001952 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001953 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01001954
Christopher Fauletf02ca002019-03-07 16:21:34 +01001955 /* Wake all streams with unassigned ID (ID == 0) */
1956 node = eb32_lookup(&h2c->streams_by_id, 0);
1957 while (node) {
1958 h2s = container_of(node, struct h2s, by_id);
1959 if (h2s->id > 0)
1960 break;
1961 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001962 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001963 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001964
1965 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001966}
1967
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001968/* Wake up all blocked streams whose window size has become positive after the
1969 * mux's initial window was adjusted. This should be done after having processed
1970 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001971 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001972static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001973{
1974 struct h2s *h2s;
1975 struct eb32_node *node;
1976
Willy Tarreau7838a792019-08-12 18:42:03 +02001977 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
1978
Willy Tarreau3421aba2017-07-27 15:41:03 +02001979 node = eb32_first(&h2c->streams_by_id);
1980 while (node) {
1981 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001982 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001983 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02001984 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001985 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
1986 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001987 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001988 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001989 node = eb32_next(node);
1990 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001991
1992 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001993}
1994
1995/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
1996 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01001997 * return an error in h2c. The caller must have already verified frame length
1998 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001999 */
2000static int h2c_handle_settings(struct h2c *h2c)
2001{
2002 unsigned int offset;
2003 int error;
2004
Willy Tarreau7838a792019-08-12 18:42:03 +02002005 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
2006
Willy Tarreau3421aba2017-07-27 15:41:03 +02002007 if (h2c->dff & H2_F_SETTINGS_ACK) {
2008 if (h2c->dfl) {
2009 error = H2_ERR_FRAME_SIZE_ERROR;
2010 goto fail;
2011 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002012 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002013 }
2014
Willy Tarreau3421aba2017-07-27 15:41:03 +02002015 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002016 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002017 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002018
2019 /* parse the frame */
2020 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002021 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2022 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002023
2024 switch (type) {
2025 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2026 /* we need to update all existing streams with the
2027 * difference from the previous iws.
2028 */
2029 if (arg < 0) { // RFC7540#6.5.2
2030 error = H2_ERR_FLOW_CONTROL_ERROR;
2031 goto fail;
2032 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002033 h2c->miw = arg;
2034 break;
2035 case H2_SETTINGS_MAX_FRAME_SIZE:
2036 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
2037 error = H2_ERR_PROTOCOL_ERROR;
2038 goto fail;
2039 }
2040 h2c->mfs = arg;
2041 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002042 case H2_SETTINGS_ENABLE_PUSH:
2043 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
2044 error = H2_ERR_PROTOCOL_ERROR;
2045 goto fail;
2046 }
2047 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002048 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2049 if (h2c->flags & H2_CF_IS_BACK) {
2050 /* the limit is only for the backend; for the frontend it is our limit */
2051 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2052 arg = h2_settings_max_concurrent_streams;
2053 h2c->streams_limit = arg;
2054 }
2055 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002056 }
2057 }
2058
2059 /* need to ACK this frame now */
2060 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002061 done:
2062 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002063 return 1;
2064 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002065 if (!(h2c->flags & H2_CF_IS_BACK))
2066 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002067 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002068 out0:
2069 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 +02002070 return 0;
2071}
2072
2073/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2074 * success or one of the h2_status values.
2075 */
2076static int h2c_ack_settings(struct h2c *h2c)
2077{
2078 struct buffer *res;
2079 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002080 int ret = 0;
2081
2082 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002083
2084 if (h2c_mux_busy(h2c, NULL)) {
2085 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002086 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002087 }
2088
Willy Tarreau9c218e72019-05-26 10:08:28 +02002089 memcpy(str,
2090 "\x00\x00\x00" /* length : 0 (no data) */
2091 "\x04" "\x01" /* type : 4, flags : ACK */
2092 "\x00\x00\x00\x00" /* stream ID */, 9);
2093
Willy Tarreaubcc45952019-05-26 10:05:50 +02002094 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002095 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002096 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002097 h2c->flags |= H2_CF_MUX_MALLOC;
2098 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002099 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002100 }
2101
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002102 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002103 if (unlikely(ret <= 0)) {
2104 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002105 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2106 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002107 h2c->flags |= H2_CF_MUX_MFULL;
2108 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002109 }
2110 else {
2111 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002112 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002113 }
2114 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002115 out:
2116 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002117 return ret;
2118}
2119
Willy Tarreaucf68c782017-10-10 17:11:41 +02002120/* processes a PING frame and schedules an ACK if needed. The caller must pass
2121 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002122 * missing data. The caller must have already verified frame length
2123 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002124 */
2125static int h2c_handle_ping(struct h2c *h2c)
2126{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002127 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002128 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002129 h2c->st0 = H2_CS_FRAME_A;
2130 return 1;
2131}
2132
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002133/* Try to send a window update for stream id <sid> and value <increment>.
2134 * Returns > 0 on success or zero on missing room or failure. It may return an
2135 * error in h2c.
2136 */
2137static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2138{
2139 struct buffer *res;
2140 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002141 int ret = 0;
2142
2143 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002144
2145 if (h2c_mux_busy(h2c, NULL)) {
2146 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002147 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002148 }
2149
Willy Tarreau9c218e72019-05-26 10:08:28 +02002150 /* length: 4, type: 8, flags: none */
2151 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2152 write_n32(str + 5, sid);
2153 write_n32(str + 9, increment);
2154
Willy Tarreaubcc45952019-05-26 10:05:50 +02002155 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002156 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002157 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002158 h2c->flags |= H2_CF_MUX_MALLOC;
2159 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002160 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002161 }
2162
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002163 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002164 if (unlikely(ret <= 0)) {
2165 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002166 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2167 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002168 h2c->flags |= H2_CF_MUX_MFULL;
2169 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002170 }
2171 else {
2172 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002173 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002174 }
2175 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002176 out:
2177 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002178 return ret;
2179}
2180
2181/* try to send pending window update for the connection. It's safe to call it
2182 * with no pending updates. Returns > 0 on success or zero on missing room or
2183 * failure. It may return an error in h2c.
2184 */
2185static int h2c_send_conn_wu(struct h2c *h2c)
2186{
2187 int ret = 1;
2188
Willy Tarreau7838a792019-08-12 18:42:03 +02002189 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2190
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002191 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002192 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002193
Willy Tarreau97aaa672018-12-23 09:49:04 +01002194 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2195 /* increase the advertised connection window to 2G on
2196 * first update.
2197 */
2198 h2c->flags |= H2_CF_WINDOW_OPENED;
2199 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2200 }
2201
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002202 /* send WU for the connection */
2203 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2204 if (ret > 0)
2205 h2c->rcvd_c = 0;
2206
Willy Tarreau7838a792019-08-12 18:42:03 +02002207 out:
2208 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002209 return ret;
2210}
2211
2212/* try to send pending window update for the current dmux stream. It's safe to
2213 * call it with no pending updates. Returns > 0 on success or zero on missing
2214 * room or failure. It may return an error in h2c.
2215 */
2216static int h2c_send_strm_wu(struct h2c *h2c)
2217{
2218 int ret = 1;
2219
Willy Tarreau7838a792019-08-12 18:42:03 +02002220 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2221
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002222 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002223 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002224
2225 /* send WU for the stream */
2226 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2227 if (ret > 0)
2228 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002229 out:
2230 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002231 return ret;
2232}
2233
Willy Tarreaucf68c782017-10-10 17:11:41 +02002234/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2235 * success, 0 on missing data or one of the h2_status values.
2236 */
2237static int h2c_ack_ping(struct h2c *h2c)
2238{
2239 struct buffer *res;
2240 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002241 int ret = 0;
2242
2243 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002244
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002245 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002246 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002247
2248 if (h2c_mux_busy(h2c, NULL)) {
2249 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002250 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002251 }
2252
Willy Tarreaucf68c782017-10-10 17:11:41 +02002253 memcpy(str,
2254 "\x00\x00\x08" /* length : 8 (same payload) */
2255 "\x06" "\x01" /* type : 6, flags : ACK */
2256 "\x00\x00\x00\x00" /* stream ID */, 9);
2257
2258 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002259 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002260
Willy Tarreau9c218e72019-05-26 10:08:28 +02002261 res = br_tail(h2c->mbuf);
2262 retry:
2263 if (!h2_get_buf(h2c, res)) {
2264 h2c->flags |= H2_CF_MUX_MALLOC;
2265 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002266 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002267 }
2268
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002269 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002270 if (unlikely(ret <= 0)) {
2271 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002272 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2273 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002274 h2c->flags |= H2_CF_MUX_MFULL;
2275 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002276 }
2277 else {
2278 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002279 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002280 }
2281 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002282 out:
2283 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002284 return ret;
2285}
2286
Willy Tarreau26f95952017-07-27 17:18:30 +02002287/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2288 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002289 * h2c or h2s. The caller must have already verified frame length and stream ID
2290 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002291 */
2292static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2293{
2294 int32_t inc;
2295 int error;
2296
Willy Tarreau7838a792019-08-12 18:42:03 +02002297 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2298
Willy Tarreau26f95952017-07-27 17:18:30 +02002299 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002300 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002301 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002302
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002303 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002304
2305 if (h2c->dsi != 0) {
2306 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002307
2308 /* it's not an error to receive WU on a closed stream */
2309 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002310 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002311
2312 if (!inc) {
2313 error = H2_ERR_PROTOCOL_ERROR;
2314 goto strm_err;
2315 }
2316
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002317 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002318 error = H2_ERR_FLOW_CONTROL_ERROR;
2319 goto strm_err;
2320 }
2321
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002322 h2s->sws += inc;
2323 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002324 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002325 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002326 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2327 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Olivier Houcharddddfe312018-10-10 18:51:00 +02002328 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002329 }
2330 }
2331 else {
2332 /* connection window update */
2333 if (!inc) {
2334 error = H2_ERR_PROTOCOL_ERROR;
2335 goto conn_err;
2336 }
2337
2338 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2339 error = H2_ERR_FLOW_CONTROL_ERROR;
2340 goto conn_err;
2341 }
2342
2343 h2c->mws += inc;
2344 }
2345
Willy Tarreau7838a792019-08-12 18:42:03 +02002346 done:
2347 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002348 return 1;
2349
2350 conn_err:
2351 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002352 out0:
2353 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 +02002354 return 0;
2355
2356 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002357 h2s_error(h2s, error);
2358 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002359 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002360 return 0;
2361}
2362
Willy Tarreaue96b0922017-10-30 00:28:29 +01002363/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002364 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2365 * have already verified frame length and stream ID validity. Described in
2366 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002367 */
2368static int h2c_handle_goaway(struct h2c *h2c)
2369{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002370 int last;
2371
Willy Tarreau7838a792019-08-12 18:42:03 +02002372 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002373 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002374 if (b_data(&h2c->dbuf) < h2c->dfl) {
2375 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002376 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002377 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002378
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002379 last = h2_get_n32(&h2c->dbuf, 0);
2380 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002381 if (h2c->last_sid < 0)
2382 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002383 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002384 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002385 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002386}
2387
Willy Tarreau92153fc2017-12-03 19:46:19 +01002388/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002389 * invalid. Returns > 0 on success or zero on missing data. It may return an
2390 * error in h2c. The caller must have already verified frame length and stream
2391 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002392 */
2393static int h2c_handle_priority(struct h2c *h2c)
2394{
Willy Tarreau7838a792019-08-12 18:42:03 +02002395 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2396
Willy Tarreau92153fc2017-12-03 19:46:19 +01002397 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002398 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002399 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002400 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002401 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002402
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002403 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002404 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01002405 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002406 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002407 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002408 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002409 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002410 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002411}
2412
Willy Tarreaucd234e92017-08-18 10:59:39 +02002413/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002414 * Returns > 0 on success or zero on missing data. The caller must have already
2415 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002416 */
2417static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2418{
Willy Tarreau7838a792019-08-12 18:42:03 +02002419 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2420
Willy Tarreaucd234e92017-08-18 10:59:39 +02002421 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002422 if (b_data(&h2c->dbuf) < h2c->dfl) {
2423 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 +02002424 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002425 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002426
2427 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002428 if (h2s->st == H2_SS_CLOSED) {
2429 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 +02002430 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002431 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002432
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002433 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002434 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002435
2436 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002437 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002438 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002439 }
2440
2441 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002442 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002443 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002444}
2445
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002446/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2447 * It may return an error in h2c or h2s. The caller must consider that the
2448 * return value is the new h2s in case one was allocated (most common case).
2449 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002450 * errors here are reported as connection errors since it's impossible to
2451 * recover from such errors after the compression context has been altered.
2452 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002453static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002454{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002455 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002456 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002457 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002458 int error;
2459
Willy Tarreau7838a792019-08-12 18:42:03 +02002460 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2461
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002462 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002463 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002464
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002465 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002466 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002467
2468 /* now either the frame is complete or the buffer is complete */
2469 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002470 /* The stream exists/existed, this must be a trailers frame */
2471 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002472 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2473 /* unrecoverable error ? */
2474 if (h2c->st0 >= H2_CS_ERROR)
2475 goto out;
2476
2477 if (error == 0)
2478 goto out; // missing data
2479
2480 if (error < 0) {
2481 /* Failed to decode this frame (e.g. too large request)
2482 * but the HPACK decompressor is still synchronized.
2483 */
2484 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2485 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002486 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002487 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002488 goto done;
2489 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002490 /* the connection was already killed by an RST, let's consume
2491 * the data and send another RST.
2492 */
2493 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2494 h2s = (struct h2s*)h2_error_stream;
2495 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002496 }
2497 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2498 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2499 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002500 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002501 goto conn_err;
2502 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002503 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2504 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002505
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002506 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002507
Willy Tarreau25919232019-01-03 14:48:18 +01002508 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002509 if (h2c->st0 >= H2_CS_ERROR)
2510 goto out;
2511
Willy Tarreau25919232019-01-03 14:48:18 +01002512 if (error <= 0) {
2513 if (error == 0)
2514 goto out; // missing data
2515
2516 /* Failed to decode this stream (e.g. too large request)
2517 * but the HPACK decompressor is still synchronized.
2518 */
2519 h2s = (struct h2s*)h2_error_stream;
2520 goto send_rst;
2521 }
2522
Willy Tarreau22de8d32018-09-05 19:55:58 +02002523 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002524 * positively from h2c_frt_stream_new(), the stream will report the error,
2525 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002526 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002527 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002528 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002529 h2s = (struct h2s*)h2_refused_stream;
2530 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002531 }
2532
2533 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002534 h2s->rxbuf = rxbuf;
2535 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002536 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002537
Willy Tarreau88d138e2019-01-02 19:38:14 +01002538 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002539 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002540 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002541
2542 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002543 if (h2s->st == H2_SS_OPEN)
2544 h2s->st = H2_SS_HREM;
2545 else
2546 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002547 }
2548
Willy Tarreau3a429f02019-01-03 11:41:50 +01002549 /* update the max stream ID if the request is being processed */
2550 if (h2s->id > h2c->max_id)
2551 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002552
Willy Tarreau022e5e52020-09-10 09:33:15 +02002553 TRACE_USER("rcvd H2 request ", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW, h2c->conn, 0, &rxbuf);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002554 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002555
2556 conn_err:
2557 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002558 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002559
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002560 out:
2561 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002562 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 +01002563 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002564
2565 send_rst:
2566 /* make the demux send an RST for the current stream. We may only
2567 * do this if we're certain that the HEADERS frame was properly
2568 * decompressed so that the HPACK decoder is still kept up to date.
2569 */
2570 h2_release_buf(h2c, &rxbuf);
2571 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002572
Willy Tarreau022e5e52020-09-10 09:33:15 +02002573 TRACE_USER("rejected H2 request", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002574 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002575 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002576}
2577
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002578/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2579 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2580 * errors here are reported as connection errors since it's impossible to
2581 * recover from such errors after the compression context has been altered.
2582 */
2583static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2584{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002585 struct buffer rxbuf = BUF_NULL;
2586 unsigned long long body_len = 0;
2587 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002588 int error;
2589
Willy Tarreau7838a792019-08-12 18:42:03 +02002590 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2591
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002592 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002593 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002594
2595 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002596 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002597
Christopher Faulet6884aa32019-09-23 15:28:20 +02002598 if (h2s->st != H2_SS_CLOSED) {
2599 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2600 }
2601 else {
2602 /* the connection was already killed by an RST, let's consume
2603 * the data and send another RST.
2604 */
2605 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002606 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002607 h2c->st0 = H2_CS_FRAME_E;
2608 goto send_rst;
2609 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002610
Willy Tarreau25919232019-01-03 14:48:18 +01002611 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002612 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002613 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002614
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002615 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2616 /* RFC7540#5.1 */
2617 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2618 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002619 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002620 }
2621
Willy Tarreau25919232019-01-03 14:48:18 +01002622 if (error <= 0) {
2623 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002624 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002625
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002626 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002627 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002628 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002629 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002630 }
2631
Christopher Fauletfa922f02019-05-07 10:55:17 +02002632 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002633 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002634
Willy Tarreau927b88b2019-03-04 08:03:25 +01002635 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002636 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002637 else if (h2s->flags & H2_SF_ES_RCVD) {
2638 if (h2s->st == H2_SS_OPEN)
2639 h2s->st = H2_SS_HREM;
2640 else if (h2s->st == H2_SS_HLOC)
2641 h2s_close(h2s);
2642 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002643
Willy Tarreau022e5e52020-09-10 09:33:15 +02002644 TRACE_USER("rcvd H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, 0, &h2s->rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002645 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002646 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002647 fail:
2648 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2649 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002650
2651 send_rst:
2652 /* make the demux send an RST for the current stream. We may only
2653 * do this if we're certain that the HEADERS frame was properly
2654 * decompressed so that the HPACK decoder is still kept up to date.
2655 */
2656 h2_release_buf(h2c, &rxbuf);
2657 h2c->st0 = H2_CS_FRAME_E;
2658
Willy Tarreau022e5e52020-09-10 09:33:15 +02002659 TRACE_USER("rejected H2 response", H2_EV_RX_FRAME|H2_EV_RX_HDR|H2_EV_STRM_NEW|H2_EV_STRM_END, h2c->conn, 0, &rxbuf);
Christopher Faulet6884aa32019-09-23 15:28:20 +02002660 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2661 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002662}
2663
Willy Tarreau454f9052017-10-26 19:40:35 +02002664/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2665 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2666 */
2667static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2668{
2669 int error;
2670
Willy Tarreau7838a792019-08-12 18:42:03 +02002671 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2672
Willy Tarreau454f9052017-10-26 19:40:35 +02002673 /* note that empty DATA frames are perfectly valid and sometimes used
2674 * to signal an end of stream (with the ES flag).
2675 */
2676
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002677 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002678 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002679
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002680 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002681 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002682
2683 /* now either the frame is complete or the buffer is complete */
2684
Willy Tarreau454f9052017-10-26 19:40:35 +02002685 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2686 /* RFC7540#6.1 */
2687 error = H2_ERR_STREAM_CLOSED;
2688 goto strm_err;
2689 }
2690
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002691 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002692 /* RFC7540#8.1.2 */
2693 error = H2_ERR_PROTOCOL_ERROR;
2694 goto strm_err;
2695 }
2696
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002697 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002698 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002699
Willy Tarreau454f9052017-10-26 19:40:35 +02002700 /* call the upper layers to process the frame, then let the upper layer
2701 * notify the stream about any change.
2702 */
2703 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002704 /* The upper layer has already closed, this may happen on
2705 * 4xx/redirects during POST, or when receiving a response
2706 * from an H2 server after the client has aborted.
2707 */
2708 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002709 goto strm_err;
2710 }
2711
Willy Tarreau8f650c32017-11-21 19:36:21 +01002712 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002713 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002714
Willy Tarreau721c9742017-11-07 11:05:42 +01002715 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002716 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002717 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002718 }
2719
2720 /* check for completion : the callee will change this to FRAME_A or
2721 * FRAME_H once done.
2722 */
2723 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002724 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002725
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002726 /* last frame */
2727 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002728 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002729 if (h2s->st == H2_SS_OPEN)
2730 h2s->st = H2_SS_HREM;
2731 else
2732 h2s_close(h2s);
2733
Willy Tarreau1915ca22019-01-24 11:49:37 +01002734 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2735 /* RFC7540#8.1.2 */
2736 error = H2_ERR_PROTOCOL_ERROR;
2737 goto strm_err;
2738 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002739 }
2740
Willy Tarreau7838a792019-08-12 18:42:03 +02002741 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002742 return 1;
2743
Willy Tarreau454f9052017-10-26 19:40:35 +02002744 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002745 h2s_error(h2s, error);
2746 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002747 fail:
2748 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 +02002749 return 0;
2750}
2751
Willy Tarreau63864812019-08-07 14:25:20 +02002752/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2753 * valid for the current stream state. This is needed only after parsing the
2754 * frame header but in practice it can be performed at any time during
2755 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2756 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2757 */
2758static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2759{
Willy Tarreau7838a792019-08-12 18:42:03 +02002760 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2761
Willy Tarreau63864812019-08-07 14:25:20 +02002762 if (h2s->st == H2_SS_IDLE &&
2763 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2764 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2765 * this state MUST be treated as a connection error
2766 */
2767 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002768 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002769 /* only log if no other stream can report the error */
2770 sess_log(h2c->conn->owner);
2771 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002772 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 +02002773 return 0;
2774 }
2775
Willy Tarreau57a18162019-11-24 14:57:53 +01002776 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2777 /* only PUSH_PROMISE would be permitted here */
2778 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2779 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2780 return 0;
2781 }
2782
Willy Tarreau63864812019-08-07 14:25:20 +02002783 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2784 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2785 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2786 * this state MUST be treated as a stream error.
2787 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2788 * PUSH_PROMISE/CONTINUATION cause connection errors.
2789 */
2790 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)
2791 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2792 else
2793 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002794 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 +02002795 return 0;
2796 }
2797
2798 /* Below the management of frames received in closed state is a
2799 * bit hackish because the spec makes strong differences between
2800 * streams closed by receiving RST, sending RST, and seeing ES
2801 * in both directions. In addition to this, the creation of a
2802 * new stream reusing the identifier of a closed one will be
2803 * detected here. Given that we cannot keep track of all closed
2804 * streams forever, we consider that unknown closed streams were
2805 * closed on RST received, which allows us to respond with an
2806 * RST without breaking the connection (eg: to abort a transfer).
2807 * Some frames have to be silently ignored as well.
2808 */
2809 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
2810 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
2811 /* #5.1.1: The identifier of a newly
2812 * established stream MUST be numerically
2813 * greater than all streams that the initiating
2814 * endpoint has opened or reserved. This
2815 * governs streams that are opened using a
2816 * HEADERS frame and streams that are reserved
2817 * using PUSH_PROMISE. An endpoint that
2818 * receives an unexpected stream identifier
2819 * MUST respond with a connection error.
2820 */
2821 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002822 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 +02002823 return 0;
2824 }
2825
Willy Tarreau4c08f122019-09-26 08:47:15 +02002826 if (h2s->flags & H2_SF_RST_RCVD &&
2827 !(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 +02002828 /* RFC7540#5.1:closed: an endpoint that
2829 * receives any frame other than PRIORITY after
2830 * receiving a RST_STREAM MUST treat that as a
2831 * stream error of type STREAM_CLOSED.
2832 *
2833 * Note that old streams fall into this category
2834 * and will lead to an RST being sent.
2835 *
2836 * However, we cannot generalize this to all frame types. Those
2837 * carrying compression state must still be processed before
2838 * being dropped or we'll desynchronize the decoder. This can
2839 * happen with request trailers received after sending an
2840 * RST_STREAM, or with header/trailers responses received after
2841 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02002842 *
2843 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002844 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02002845 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02002846 */
2847 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2848 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002849 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 +02002850 return 0;
2851 }
2852
2853 /* RFC7540#5.1:closed: if this state is reached as a
2854 * result of sending a RST_STREAM frame, the peer that
2855 * receives the RST_STREAM might have already sent
2856 * frames on the stream that cannot be withdrawn. An
2857 * endpoint MUST ignore frames that it receives on
2858 * closed streams after it has sent a RST_STREAM
2859 * frame. An endpoint MAY choose to limit the period
2860 * over which it ignores frames and treat frames that
2861 * arrive after this time as being in error.
2862 */
2863 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
2864 /* RFC7540#5.1:closed: any frame other than
2865 * PRIO/WU/RST in this state MUST be treated as
2866 * a connection error
2867 */
2868 if (h2c->dft != H2_FT_RST_STREAM &&
2869 h2c->dft != H2_FT_PRIORITY &&
2870 h2c->dft != H2_FT_WINDOW_UPDATE) {
2871 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002872 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 +02002873 return 0;
2874 }
2875 }
2876 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002877 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02002878 return 1;
2879}
2880
Willy Tarreaubc933932017-10-09 16:21:43 +02002881/* process Rx frames to be demultiplexed */
2882static void h2_process_demux(struct h2c *h2c)
2883{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002884 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002885 struct h2_fh hdr;
2886 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002887 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02002888
Willy Tarreau7838a792019-08-12 18:42:03 +02002889 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2890
Willy Tarreau081d4722017-05-16 21:51:05 +02002891 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002892 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02002893
2894 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2895 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002896 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02002897 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02002898 goto out;
2899
Willy Tarreau52eed752017-09-22 15:05:09 +02002900 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
2901 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002902 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002903 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002904 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002905 sess_log(h2c->conn->owner);
2906 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002907 goto fail;
2908 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002909 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002910
2911 h2c->max_id = 0;
2912 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002913 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002914 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002915
2916 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002917 /* ensure that what is pending is a valid SETTINGS frame
2918 * without an ACK.
2919 */
Willy Tarreau7838a792019-08-12 18:42:03 +02002920 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 +02002921 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002922 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002923 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002924 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 +02002925 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002926 if (!(h2c->flags & H2_CF_IS_BACK))
2927 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002928 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002929 goto fail;
2930 }
2931
2932 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
2933 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002934 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 +02002935 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2936 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002937 if (!(h2c->flags & H2_CF_IS_BACK))
2938 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002939 goto fail;
2940 }
2941
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002942 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002943 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002944 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 +02002945 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2946 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002947 if (!(h2c->flags & H2_CF_IS_BACK))
2948 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002949 goto fail;
2950 }
2951
Willy Tarreau3bf69182018-12-21 15:34:50 +01002952 /* that's OK, switch to FRAME_P to process it. This is
2953 * a SETTINGS frame whose header has already been
2954 * deleted above.
2955 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01002956 padlen = 0;
2957 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002958 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002959 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002960
2961 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02002962 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002963 int ret = 0;
2964
Willy Tarreau7838a792019-08-12 18:42:03 +02002965 if (!b_data(&h2c->dbuf)) {
2966 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
2967 break;
2968 }
2969
2970 if (h2c->st0 >= H2_CS_ERROR) {
2971 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002972 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02002973 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002974
2975 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02002976 h2c->rcvd_s = 0;
2977
Willy Tarreau7838a792019-08-12 18:42:03 +02002978 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01002979 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02002980 break;
2981
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002982 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002983 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 +02002984 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002985 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02002986 /* only log if no other stream can report the error */
2987 sess_log(h2c->conn->owner);
2988 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002989 break;
2990 }
2991
Christopher Fauletdd2a5622019-06-18 12:22:38 +02002992 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002993 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
2994 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
2995 * we read the pad length and drop it from the remaining
2996 * payload (one byte + the 9 remaining ones = 10 total
2997 * removed), so we have a frame payload starting after the
2998 * pad len. Flow controlled frames (DATA) also count the
2999 * padlen in the flow control, so it must be adjusted.
3000 */
3001 if (hdr.len < 1) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003002 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 +01003003 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003004 if (!(h2c->flags & H2_CF_IS_BACK))
3005 sess_log(h2c->conn->owner);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003006 goto fail;
3007 }
3008 hdr.len--;
3009
3010 if (b_data(&h2c->dbuf) < 10)
3011 break; // missing padlen
3012
3013 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3014
3015 if (padlen > hdr.len) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003016 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 +01003017 /* RFC7540#6.1 : pad length = length of
3018 * frame payload or greater => error.
3019 */
3020 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003021 if (!(h2c->flags & H2_CF_IS_BACK))
3022 sess_log(h2c->conn->owner);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003023 goto fail;
3024 }
3025
3026 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3027 h2c->rcvd_c++;
3028 h2c->rcvd_s++;
3029 }
3030 b_del(&h2c->dbuf, 1);
3031 }
3032 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003033
3034 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003035 h2c->dfl = hdr.len;
3036 h2c->dsi = hdr.sid;
3037 h2c->dft = hdr.ft;
3038 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003039 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003040 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 +02003041 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003042
3043 /* check for minimum basic frame format validity */
3044 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3045 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003046 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 +01003047 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003048 if (!(h2c->flags & H2_CF_IS_BACK))
3049 sess_log(h2c->conn->owner);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003050 goto fail;
3051 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003052 }
3053
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003054 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3055 * H2_CS_FRAME_P indicates an incomplete previous operation
3056 * (most often the first attempt) and requires some validity
3057 * checks for the frame and the current state. The two other
3058 * ones are set after completion (or abortion) and must skip
3059 * validity checks.
3060 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003061 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3062
Willy Tarreau567beb82018-12-18 16:52:44 +01003063 if (tmp_h2s != h2s && h2s && h2s->cs &&
3064 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003065 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003066 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003067 (h2s->flags & H2_SF_ES_RCVD) ||
3068 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003069 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003070 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 +01003071 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003072 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003073 }
3074 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003075
Willy Tarreau63864812019-08-07 14:25:20 +02003076 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003077 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3078 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003079 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003080 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003081
Willy Tarreau7e98c052017-10-10 15:56:59 +02003082 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003083 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003084 if (h2c->st0 == H2_CS_FRAME_P) {
3085 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003086 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003087 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003088
Willy Tarreau7838a792019-08-12 18:42:03 +02003089 if (h2c->st0 == H2_CS_FRAME_A) {
3090 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 +02003091 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003092 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003093 break;
3094
Willy Tarreaucf68c782017-10-10 17:11:41 +02003095 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003096 if (h2c->st0 == H2_CS_FRAME_P) {
3097 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003098 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003099 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003100
Willy Tarreau7838a792019-08-12 18:42:03 +02003101 if (h2c->st0 == H2_CS_FRAME_A) {
3102 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 +02003103 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003104 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003105 break;
3106
Willy Tarreau26f95952017-07-27 17:18:30 +02003107 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003108 if (h2c->st0 == H2_CS_FRAME_P) {
3109 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 +02003110 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003111 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003112 break;
3113
Willy Tarreau61290ec2017-10-17 08:19:21 +02003114 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003115 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003116 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3117 * frames' parsers consume all following CONTINUATION
3118 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003119 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003120 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 +01003121 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003122 if (!(h2c->flags & H2_CF_IS_BACK))
3123 sess_log(h2c->conn->owner);
Willy Tarreauea18f862018-12-22 20:19:26 +01003124 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003125
Willy Tarreau13278b42017-10-13 19:23:14 +02003126 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003127 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003128 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003129 if (h2c->flags & H2_CF_IS_BACK)
3130 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3131 else
3132 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003133 if (tmp_h2s) {
3134 h2s = tmp_h2s;
3135 ret = 1;
3136 }
3137 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003138 break;
3139
Willy Tarreau454f9052017-10-26 19:40:35 +02003140 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003141 if (h2c->st0 == H2_CS_FRAME_P) {
3142 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003143 ret = h2c_frt_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003144 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003145
Willy Tarreau7838a792019-08-12 18:42:03 +02003146 if (h2c->st0 == H2_CS_FRAME_A) {
3147 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 +02003148 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003149 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003150 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003151
Willy Tarreau92153fc2017-12-03 19:46:19 +01003152 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003153 if (h2c->st0 == H2_CS_FRAME_P) {
3154 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003155 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003156 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003157 break;
3158
Willy Tarreaucd234e92017-08-18 10:59:39 +02003159 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003160 if (h2c->st0 == H2_CS_FRAME_P) {
3161 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 +02003162 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003163 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02003164 break;
3165
Willy Tarreaue96b0922017-10-30 00:28:29 +01003166 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003167 if (h2c->st0 == H2_CS_FRAME_P) {
3168 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003169 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003170 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01003171 break;
3172
Willy Tarreau1c661982017-10-30 13:52:01 +01003173 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003174 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003175 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003176 /* drop frames that we ignore. They may be larger than
3177 * the buffer so we drain all of their contents until
3178 * we reach the end.
3179 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003180 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3181 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003182 h2c->dfl -= ret;
3183 ret = h2c->dfl == 0;
3184 }
3185
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003186 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003187 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003188 if (h2s->st == H2_SS_ERROR) {
3189 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 +01003190 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003191 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003192
Willy Tarreau7838a792019-08-12 18:42:03 +02003193 if (h2c->st0 == H2_CS_FRAME_E) {
3194 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 +01003195 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003196 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003197
Willy Tarreau7e98c052017-10-10 15:56:59 +02003198 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003199 if (ret <= 0) {
3200 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003201 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003202 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003203
3204 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreaubba7a4d2020-09-18 07:41:28 +02003205 if (h2c->dfl)
3206 TRACE_DEVEL("skipping remaining frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
Christopher Faulet5112a602019-09-26 16:38:28 +02003207 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3208 b_del(&h2c->dbuf, ret);
3209 h2c->dfl -= ret;
3210 if (!h2c->dfl) {
3211 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3212 h2c->st0 = H2_CS_FRAME_H;
3213 h2c->dsi = -1;
3214 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003215 }
3216 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003217
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003218 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003219 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3220 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003221 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003222 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003223
Willy Tarreau52eed752017-09-22 15:05:09 +02003224 fail:
3225 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01003226 if (h2s && h2s->cs &&
3227 (b_data(&h2s->rxbuf) ||
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003228 h2c_read0_pending(h2c) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003229 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003230 (h2s->flags & H2_SF_ES_RCVD) ||
3231 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003232 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003233 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 +01003234 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003235 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003236 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003237
Willy Tarreau7838a792019-08-12 18:42:03 +02003238 if (old_iw != h2c->miw) {
3239 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003240 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003241 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003242
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003243 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003244 out:
3245 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreaubc933932017-10-09 16:21:43 +02003246}
3247
Willy Tarreau989539b2020-01-10 17:01:29 +01003248/* resume each h2s eligible for sending in list head <head> */
3249static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3250{
3251 struct h2s *h2s, *h2s_back;
3252
3253 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3254
3255 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3256 if (h2c->mws <= 0 ||
3257 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3258 h2c->st0 >= H2_CS_ERROR)
3259 break;
3260
3261 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003262
Willy Tarreaud9464162020-01-10 18:25:07 +01003263 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003264 continue;
3265
Willy Tarreau5723f292020-01-10 15:16:57 +01003266 /* If the sender changed his mind and unsubscribed, let's just
3267 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003268 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003269 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3270 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003271 LIST_DEL_INIT(&h2s->list);
3272 continue;
3273 }
3274
Willy Tarreauf96508a2020-01-10 11:12:48 +01003275 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003276 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003277 tasklet_wakeup(h2s->subs->tasklet);
3278 h2s->subs->events &= ~SUB_RETRY_SEND;
3279 if (!h2s->subs->events)
3280 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003281 }
3282 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3283 tasklet_wakeup(h2s->shut_tl);
3284 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003285 }
3286
3287 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3288}
3289
Willy Tarreaubc933932017-10-09 16:21:43 +02003290/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3291 * the end.
3292 */
3293static int h2_process_mux(struct h2c *h2c)
3294{
Willy Tarreau7838a792019-08-12 18:42:03 +02003295 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3296
Willy Tarreau01b44822018-10-03 14:26:37 +02003297 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3298 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3299 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3300 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003301 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003302 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003303 goto fail;
3304 }
3305 h2c->st0 = H2_CS_SETTINGS1;
3306 }
3307 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003308 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003309 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003310 }
3311
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003312 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003313 if (h2c->rcvd_s > 0 &&
3314 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3315 h2c_send_strm_wu(h2c) < 0)
3316 goto fail;
3317
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003318 if (h2c->rcvd_c > 0 &&
3319 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3320 h2c_send_conn_wu(h2c) < 0)
3321 goto fail;
3322
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003323 /* First we always process the flow control list because the streams
3324 * waiting there were already elected for immediate emission but were
3325 * blocked just on this.
3326 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003327 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3328 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003329
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003330 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003331 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003332 if (h2c->st0 == H2_CS_ERROR) {
3333 if (h2c->max_id >= 0) {
3334 h2c_send_goaway_error(h2c, NULL);
3335 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003336 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003337 }
3338
3339 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3340 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003341 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003342 done:
3343 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3344 return 1;
3345 out0:
3346 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3347 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003348}
3349
Willy Tarreau62f52692017-10-08 23:01:42 +02003350
Willy Tarreau479998a2018-11-18 06:30:59 +01003351/* Attempt to read data, and subscribe if none available.
3352 * The function returns 1 if data has been received, otherwise zero.
3353 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003354static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003355{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003356 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003357 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003358 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003359 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003360
Willy Tarreau7838a792019-08-12 18:42:03 +02003361 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3362
3363 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3364 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003365 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003366 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003367
Willy Tarreau7838a792019-08-12 18:42:03 +02003368 if (!h2_recv_allowed(h2c)) {
3369 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003370 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003371 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003372
Willy Tarreau44e973f2018-03-01 17:49:30 +01003373 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003374 if (!buf) {
3375 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003376 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003377 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003378 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003379
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003380 b_realign_if_empty(buf);
3381 if (!b_data(buf)) {
3382 /* try to pre-align the buffer like the
3383 * rxbufs will be to optimize memory copies. We'll make
3384 * sure that the frame header lands at the end of the
3385 * HTX block to alias it upon recv. We cannot use the
3386 * head because rcv_buf() will realign the buffer if
3387 * it's empty. Thus we cheat and pretend we already
3388 * have a few bytes there.
3389 */
3390 max = buf_room_for_htx_data(buf) + 9;
3391 buf->head = sizeof(struct htx) - 9;
3392 }
3393 else
3394 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003395
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003396 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003397
Willy Tarreau7838a792019-08-12 18:42:03 +02003398 if (max && !ret && h2_recv_allowed(h2c)) {
3399 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003400 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003401 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003402 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003403
Olivier Houcharda1411e62018-08-17 18:42:48 +02003404 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003405 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003406 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003407 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003408 }
3409
Willy Tarreau7838a792019-08-12 18:42:03 +02003410 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003411 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003412 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003413 }
3414
3415 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003416 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003417}
3418
Willy Tarreau479998a2018-11-18 06:30:59 +01003419/* Try to send data if possible.
3420 * The function returns 1 if data have been sent, otherwise zero.
3421 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003422static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003423{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003424 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003425 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003426 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003427
Willy Tarreau7838a792019-08-12 18:42:03 +02003428 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003429
Willy Tarreau7838a792019-08-12 18:42:03 +02003430 if (conn->flags & CO_FL_ERROR) {
3431 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3432 return 1;
3433 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003434
Willy Tarreau911db9b2020-01-23 16:27:54 +01003435 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003436 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003437 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003438 }
3439
Willy Tarreaubc933932017-10-09 16:21:43 +02003440 /* This loop is quite simple : it tries to fill as much as it can from
3441 * pending streams into the existing buffer until it's reportedly full
3442 * or the end of send requests is reached. Then it tries to send this
3443 * buffer's contents out, marks it not full if at least one byte could
3444 * be sent, and tries again.
3445 *
3446 * The snd_buf() function normally takes a "flags" argument which may
3447 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3448 * data immediately comes and CO_SFL_STREAMER to indicate that the
3449 * connection is streaming lots of data (used to increase TLS record
3450 * size at the expense of latency). The former can be sent any time
3451 * there's a buffer full flag, as it indicates at least one stream
3452 * attempted to send and failed so there are pending data. An
3453 * alternative would be to set it as long as there's an active stream
3454 * but that would be problematic for ACKs until we have an absolute
3455 * guarantee that all waiters have at least one byte to send. The
3456 * latter should possibly not be set for now.
3457 */
3458
3459 done = 0;
3460 while (!done) {
3461 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003462 unsigned int released = 0;
3463 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003464
3465 /* fill as much as we can into the current buffer */
3466 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3467 done = h2_process_mux(h2c);
3468
Olivier Houchard2b094432019-01-29 18:28:36 +01003469 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003470 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003471
Willy Tarreaubc933932017-10-09 16:21:43 +02003472 if (conn->flags & CO_FL_ERROR)
3473 break;
3474
3475 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3476 flags |= CO_SFL_MSG_MORE;
3477
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003478 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3479 if (b_data(buf)) {
3480 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003481 if (!ret) {
3482 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003483 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003484 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003485 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003486 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003487 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003488 if (b_data(buf)) {
3489 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003490 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003491 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003492 }
3493 b_free(buf);
3494 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003495 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003496
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003497 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003498 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003499
Willy Tarreaubc933932017-10-09 16:21:43 +02003500 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003501 if (sent)
3502 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003503 }
3504
Willy Tarreaua2af5122017-10-09 11:56:46 +02003505 if (conn->flags & CO_FL_SOCK_WR_SH) {
3506 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003507 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003508 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003509 /* We're not full anymore, so we can wake any task that are waiting
3510 * for us.
3511 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003512 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3513 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003514
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003515 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003516 if (!br_data(h2c->mbuf)) {
3517 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003518 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003519 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003520schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003521 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3522 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003523 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003524 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003525
Willy Tarreau7838a792019-08-12 18:42:03 +02003526 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003527 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003528}
3529
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003530/* this is the tasklet referenced in h2c->wait_event.tasklet */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003531static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
3532{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003533 struct connection *conn;
3534 struct tasklet *tl = (struct tasklet *)t;
3535 int conn_in_list;
3536 struct h2c *h2c;
Olivier Houchard7505f942018-08-21 18:10:44 +02003537 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003538
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003539
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003540 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003541 if (t->context == NULL) {
3542 /* The connection has been taken over by another thread,
3543 * we're no longer responsible for it, so just free the
3544 * tasklet, and do nothing.
3545 */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003546 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003547 tasklet_free(tl);
Willy Tarreau38468772020-06-28 00:31:13 +02003548 goto leave;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003549 }
3550 h2c = ctx;
3551 conn = h2c->conn;
3552
3553 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3554
3555 conn_in_list = conn->flags & CO_FL_LIST_MASK;
3556
3557 /* Remove the connection from the list, to be sure nobody attempts
3558 * to use it while we handle the I/O events
3559 */
3560 if (conn_in_list)
3561 MT_LIST_DEL(&conn->list);
3562
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003563 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau7838a792019-08-12 18:42:03 +02003564
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003565 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003566 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003567 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003568 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003569 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003570 ret = h2_process(h2c);
3571
3572 /* If we were in an idle list, we want to add it back into it,
3573 * unless h2_process() returned -1, which mean it has destroyed
3574 * the connection (testing !ret is enough, if h2_process() wasn't
3575 * called then ret will be 0 anyway.
3576 */
3577 if (!ret && conn_in_list) {
3578 struct server *srv = objt_server(conn->target);
3579
3580 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003581 MT_LIST_ADDQ(&srv->safe_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003582 else
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003583 MT_LIST_ADDQ(&srv->idle_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003584 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003585
Willy Tarreau38468772020-06-28 00:31:13 +02003586leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003587 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003588 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003589}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003590
Willy Tarreau62f52692017-10-08 23:01:42 +02003591/* callback called on any event by the connection handler.
3592 * It applies changes and returns zero, or < 0 if it wants immediate
3593 * destruction of the connection (which normally doesn not happen in h2).
3594 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003595static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003596{
Olivier Houchard7505f942018-08-21 18:10:44 +02003597 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003598
Willy Tarreau7838a792019-08-12 18:42:03 +02003599 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3600
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003601 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003602 h2_process_demux(h2c);
3603
3604 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003605 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003606
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003607 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003608 h2c->flags &= ~H2_CF_DEM_DFULL;
3609 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003610 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003611
Willy Tarreaub1e600c2020-10-13 18:09:15 +02003612 if (unlikely(h2c->proxy->disabled) && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003613 /* frontend is stopping, reload likely in progress, let's try
3614 * to announce a graceful shutdown if not yet done. We don't
3615 * care if it fails, it will be tried again later.
3616 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003617 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003618 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3619 if (h2c->last_sid < 0)
3620 h2c->last_sid = (1U << 31) - 1;
3621 h2c_send_goaway_error(h2c, NULL);
3622 }
3623 }
3624
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003625 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003626 * If we received early data, and the handshake is done, wake
3627 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003628 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003629 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003630 (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_WAIT_XPRT | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003631 struct eb32_node *node;
3632 struct h2s *h2s;
3633
3634 h2c->flags |= H2_CF_WAIT_FOR_HS;
3635 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3636
3637 while (node) {
3638 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003639 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003640 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003641 node = eb32_next(node);
3642 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003643 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003644
Christopher Fauletaade4ed2020-10-08 15:38:41 +02003645 if (conn->flags & CO_FL_ERROR || h2c_read0_pending(h2c) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003646 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3647 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3648 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003649 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003650
3651 if (eb_is_empty(&h2c->streams_by_id)) {
3652 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003653 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003654 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003655 return -1;
3656 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003657
3658 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003659 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003660 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003661 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003662 }
3663 else if (h2c->st0 == H2_CS_ERROR) {
3664 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003665 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003666 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003667 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003668 }
3669
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003670 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003671 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003672
Olivier Houchard53216e72018-10-10 15:46:36 +02003673 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3674 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3675 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003676 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003677 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3678 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003679 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003680
Willy Tarreau3f133572017-10-31 19:21:06 +01003681 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003682 if (h2c_may_expire(h2c))
3683 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3684 else
3685 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003686 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003687 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003688
Olivier Houchard7505f942018-08-21 18:10:44 +02003689 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003690 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003691 return 0;
3692}
3693
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003694/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003695static int h2_wake(struct connection *conn)
3696{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003697 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003698 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003699
Willy Tarreau7838a792019-08-12 18:42:03 +02003700 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3701 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003702 if (ret >= 0)
3703 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003704 TRACE_LEAVE(H2_EV_H2C_WAKE);
3705 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003706}
3707
Willy Tarreauea392822017-10-31 10:02:25 +01003708/* Connection timeout management. The principle is that if there's no receipt
3709 * nor sending for a certain amount of time, the connection is closed. If the
3710 * MUX buffer still has lying data or is not allocatable, the connection is
3711 * immediately killed. If it's allocatable and empty, we attempt to send a
3712 * GOAWAY frame.
3713 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003714static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003715{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003716 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003717 int expired = tick_is_expired(t->expire, now_ms);
3718
Willy Tarreau7838a792019-08-12 18:42:03 +02003719 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3720
Willy Tarreaubd42e922020-06-30 11:19:23 +02003721 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003722 /* Make sure nobody stole the connection from us */
3723 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3724
3725 /* Somebody already stole the connection from us, so we should not
3726 * free it, we just have to free the task.
3727 */
3728 if (!t->context) {
3729 h2c = NULL;
Willy Tarreau46ac7812020-07-04 07:16:18 +02003730 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003731 goto do_leave;
3732 }
3733
3734
Willy Tarreaubd42e922020-06-30 11:19:23 +02003735 if (!expired) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003736 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003737 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3738 return t;
3739 }
Willy Tarreauea392822017-10-31 10:02:25 +01003740
Willy Tarreaubd42e922020-06-30 11:19:23 +02003741 if (!h2c_may_expire(h2c)) {
3742 /* we do still have streams but all of them are idle, waiting
3743 * for the data layer, so we must not enforce the timeout here.
3744 */
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003745 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003746 t->expire = TICK_ETERNITY;
3747 return t;
3748 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003749
Willy Tarreaubd42e922020-06-30 11:19:23 +02003750 /* We're about to destroy the connection, so make sure nobody attempts
3751 * to steal it from us.
3752 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02003753 if (h2c->conn->flags & CO_FL_LIST_MASK)
3754 MT_LIST_DEL(&h2c->conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003755
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003756 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003757 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003758
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003759do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02003760 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003761
3762 if (!h2c) {
3763 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003764 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02003765 return NULL;
3766 }
3767
3768 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003769 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003770 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003771
Willy Tarreau662fafc2019-05-26 09:43:07 +02003772 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003773 /* don't even try to send a GOAWAY, the buffer is stuck */
3774 h2c->flags |= H2_CF_GOAWAY_FAILED;
3775 }
3776
3777 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003778 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003779 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3780 h2c->flags |= H2_CF_GOAWAY_FAILED;
3781
Willy Tarreau662fafc2019-05-26 09:43:07 +02003782 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003783 unsigned int released = 0;
3784 struct buffer *buf;
3785
3786 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3787 if (b_data(buf)) {
3788 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3789 if (!ret)
3790 break;
3791 b_del(buf, ret);
3792 if (b_data(buf))
3793 break;
3794 b_free(buf);
3795 released++;
3796 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003797 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003798
3799 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003800 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003801 }
Willy Tarreauea392822017-10-31 10:02:25 +01003802
Willy Tarreau4481e262019-10-31 15:36:30 +01003803 /* in any case this connection must not be considered idle anymore */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003804 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003805 MT_LIST_DEL((struct mt_list *)&h2c->conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003806 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003807
Willy Tarreau0975f112018-03-29 15:22:59 +02003808 /* either we can release everything now or it will be done later once
3809 * the last stream closes.
3810 */
3811 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003812 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003813
Willy Tarreau7838a792019-08-12 18:42:03 +02003814 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01003815 return NULL;
3816}
3817
3818
Willy Tarreau62f52692017-10-08 23:01:42 +02003819/*******************************************/
3820/* functions below are used by the streams */
3821/*******************************************/
3822
3823/*
3824 * Attach a new stream to a connection
3825 * (Used for outgoing connections)
3826 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003827static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003828{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003829 struct conn_stream *cs;
3830 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003831 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003832
Willy Tarreau7838a792019-08-12 18:42:03 +02003833 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02003834 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02003835 if (!cs) {
3836 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003837 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003838 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01003839 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003840 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003841 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003842 cs_free(cs);
3843 return NULL;
3844 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003845 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003846 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003847}
3848
Willy Tarreaufafd3982018-11-18 21:29:20 +01003849/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3850 * We have to scan because we may have some orphan streams. It might be
3851 * beneficial to scan backwards from the end to reduce the likeliness to find
3852 * orphans.
3853 */
3854static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3855{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003856 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003857 struct h2s *h2s;
3858 struct eb32_node *node;
3859
3860 node = eb32_first(&h2c->streams_by_id);
3861 while (node) {
3862 h2s = container_of(node, struct h2s, by_id);
3863 if (h2s->cs)
3864 return h2s->cs;
3865 node = eb32_next(node);
3866 }
3867 return NULL;
3868}
3869
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02003870static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
3871{
3872 int ret = 0;
3873 struct h2c *h2c = conn->ctx;
3874
3875 switch (mux_ctl) {
3876 case MUX_STATUS:
3877 /* Only consider the mux to be ready if we're done with
3878 * the preface and settings, and we had no error.
3879 */
3880 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
3881 ret |= MUX_STATUS_READY;
3882 return ret;
3883 default:
3884 return -1;
3885 }
3886}
3887
Willy Tarreau62f52692017-10-08 23:01:42 +02003888/*
Olivier Houchard060ed432018-11-06 16:32:42 +01003889 * Destroy the mux and the associated connection, if it is no longer used
3890 */
Christopher Faulet73c12072019-04-08 11:23:22 +02003891static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01003892{
Christopher Faulet73c12072019-04-08 11:23:22 +02003893 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01003894
Willy Tarreau7838a792019-08-12 18:42:03 +02003895 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02003896 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02003897 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003898 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01003899}
3900
3901/*
Willy Tarreau62f52692017-10-08 23:01:42 +02003902 * Detach the stream from the connection and possibly release the connection.
3903 */
3904static void h2_detach(struct conn_stream *cs)
3905{
Willy Tarreau60935142017-10-16 18:11:19 +02003906 struct h2s *h2s = cs->ctx;
3907 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003908 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003909
Willy Tarreau7838a792019-08-12 18:42:03 +02003910 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
3911
Willy Tarreau60935142017-10-16 18:11:19 +02003912 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003913 if (!h2s) {
3914 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02003915 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003916 }
Willy Tarreau60935142017-10-16 18:11:19 +02003917
Willy Tarreaud9464162020-01-10 18:25:07 +01003918 /* there's no txbuf so we're certain not to be able to send anything */
3919 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02003920
Olivier Houchardf502aca2018-12-14 19:42:40 +01003921 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003922 h2c = h2s->h2c;
3923 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02003924 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01003925 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
3926 !h2_frt_has_too_many_cs(h2c)) {
3927 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02003928 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003929 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02003930 }
Willy Tarreau60935142017-10-16 18:11:19 +02003931
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003932 /* this stream may be blocked waiting for some data to leave (possibly
3933 * an ES or RST frame), so orphan it in this case.
3934 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02003935 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02003936 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01003937 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01003938 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003939 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003940 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003941 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003942
Willy Tarreau45f752e2017-10-30 15:44:59 +01003943 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
3944 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
3945 /* unblock the connection if it was blocked on this
3946 * stream.
3947 */
3948 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
3949 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003950 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01003951 }
3952
Willy Tarreau71049cc2018-03-28 13:56:39 +02003953 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02003954
Christopher Faulet9b79a102019-07-15 11:22:56 +02003955 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003956 if (!(h2c->conn->flags &
3957 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02003958 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02003959 /* Add the connection in the session server list, if not already done */
3960 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
3961 h2c->conn->owner = NULL;
3962 if (eb_is_empty(&h2c->streams_by_id)) {
3963 h2c->conn->mux->destroy(h2c);
3964 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
3965 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02003966 }
3967 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02003968 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02003969 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
3970 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
3971 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01003972 return;
3973 }
3974 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003975 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02003976 else {
3977 if (eb_is_empty(&h2c->streams_by_id)) {
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02003978 /* If the connection is owned by the session, first remove it
3979 * from its list
3980 */
3981 if (h2c->conn->owner) {
3982 session_unown_conn(h2c->conn->owner, h2c->conn);
3983 h2c->conn->owner = NULL;
3984 }
3985
Olivier Houcharddc2f2752020-02-13 19:12:07 +01003986 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01003987 /* The server doesn't want it, let's kill the connection right away */
3988 h2c->conn->mux->destroy(h2c);
3989 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
3990 return;
3991 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01003992 /* At this point, the connection has been added to the
3993 * server idle list, so another thread may already have
3994 * hijacked it, so we can't do anything with it.
3995 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01003996 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
3997 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01003998
Olivier Houchard8a786902018-12-15 16:05:40 +01003999 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02004000 else if (MT_LIST_ISEMPTY(&h2c->conn->list) &&
Amaury Denoyelle6b8daef2020-10-14 18:17:10 +02004001 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target) &&
4002 !LIST_ADDED(&h2c->conn->session_list)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02004003 LIST_ADD(&__objt_server(h2c->conn->target)->available_conns[tid], mt_list_to_list(&h2c->conn->list));
4004 }
Olivier Houchard8a786902018-12-15 16:05:40 +01004005 }
4006 }
4007 }
4008
Willy Tarreaue323f342018-03-28 13:51:45 +02004009 /* We don't want to close right now unless we're removing the
4010 * last stream, and either the connection is in error, or it
4011 * reached the ID already specified in a GOAWAY frame received
4012 * or sent (as seen by last_sid >= 0).
4013 */
Olivier Houchard7a977432019-03-21 15:47:13 +01004014 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02004015 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004016 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02004017 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02004018 }
4019 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02004020 if (h2c_may_expire(h2c))
4021 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4022 else
4023 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004024 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004025 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004026 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004027 else
4028 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004029}
4030
Willy Tarreau88bdba32019-05-13 18:17:53 +02004031/* Performs a synchronous or asynchronous shutr(). */
4032static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004033{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004034 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004035
Willy Tarreauf983d002019-05-14 10:40:21 +02004036 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004037 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004038
Willy Tarreau7838a792019-08-12 18:42:03 +02004039 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4040
Willy Tarreau18059042019-01-31 19:12:48 +01004041 /* a connstream may require us to immediately kill the whole connection
4042 * for example because of a "tcp-request content reject" rule that is
4043 * normally used to limit abuse. In this case we schedule a goaway to
4044 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004045 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004046 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004047 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004048 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004049 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4050 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4051 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004052 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4053 /* Nothing was never sent for this stream, so reset with
4054 * REFUSED_STREAM error to let the client retry the
4055 * request.
4056 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004057 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004058 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4059 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004060 else {
4061 /* a final response was already provided, we don't want this
4062 * stream anymore. This may happen when the server responds
4063 * before the end of an upload and closes quickly (redirect,
4064 * deny, ...)
4065 */
4066 h2s_error(h2s, H2_ERR_CANCEL);
4067 }
Willy Tarreau18059042019-01-31 19:12:48 +01004068
Willy Tarreau90c32322017-11-24 08:00:30 +01004069 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004070 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004071 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004072
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004073 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004074 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004075 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004076 done:
4077 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004078 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004079 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004080add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004081 /* Let the handler know we want to shutr, and add ourselves to the
4082 * most relevant list if not yet done. h2_deferred_shut() will be
4083 * automatically called via the shut_tl tasklet when there's room
4084 * again.
4085 */
4086 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004087 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004088 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004089 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004090 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004091 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004092 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004093 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004094 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004095}
4096
Willy Tarreau88bdba32019-05-13 18:17:53 +02004097/* Performs a synchronous or asynchronous shutw(). */
4098static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004099{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004100 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004101
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004102 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004103 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004104
Willy Tarreau7838a792019-08-12 18:42:03 +02004105 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4106
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004107 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004108 /* we can cleanly close using an empty data frame only after headers */
4109
4110 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4111 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004112 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004113
4114 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004115 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004116 else
4117 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004118 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004119 /* a connstream may require us to immediately kill the whole connection
4120 * for example because of a "tcp-request content reject" rule that is
4121 * normally used to limit abuse. In this case we schedule a goaway to
4122 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004123 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004124 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004125 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004126 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004127 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4128 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4129 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004130 else {
4131 /* Nothing was never sent for this stream, so reset with
4132 * REFUSED_STREAM error to let the client retry the
4133 * request.
4134 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004135 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004136 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4137 }
Willy Tarreau18059042019-01-31 19:12:48 +01004138
Willy Tarreau90c32322017-11-24 08:00:30 +01004139 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004140 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004141 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004142
Willy Tarreau00dd0782018-03-01 16:31:34 +01004143 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004144 }
4145
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004146 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004147 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004148
4149 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4150
Willy Tarreau88bdba32019-05-13 18:17:53 +02004151 done:
4152 h2s->flags &= ~H2_SF_WANT_SHUTW;
4153 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004154
4155 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004156 /* Let the handler know we want to shutw, and add ourselves to the
4157 * most relevant list if not yet done. h2_deferred_shut() will be
4158 * automatically called via the shut_tl tasklet when there's room
4159 * again.
4160 */
4161 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004162 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004163 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004164 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004165 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004166 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004167 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004168 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004169 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004170}
4171
Willy Tarreau5723f292020-01-10 15:16:57 +01004172/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004173 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4174 * and prevented the last frame from being emitted.
4175 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004176static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
4177{
4178 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004179 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004180
Willy Tarreau7838a792019-08-12 18:42:03 +02004181 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4182
Willy Tarreau5723f292020-01-10 15:16:57 +01004183 if (h2s->flags & H2_SF_NOTIFIED) {
4184 /* some data processing remains to be done first */
4185 goto end;
4186 }
4187
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004188 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004189 h2_do_shutw(h2s);
4190
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004191 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004192 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004193
Willy Tarreau88bdba32019-05-13 18:17:53 +02004194 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004195 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004196 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004197
Willy Tarreau88bdba32019-05-13 18:17:53 +02004198 if (!h2s->cs) {
4199 h2s_destroy(h2s);
4200 if (h2c_is_dead(h2c))
4201 h2_release(h2c);
4202 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004203 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004204 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004205 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004206 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004207}
4208
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004209/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004210static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4211{
4212 struct h2s *h2s = cs->ctx;
4213
Willy Tarreau7838a792019-08-12 18:42:03 +02004214 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004215 if (cs->flags & CS_FL_KILL_CONN)
4216 h2s->flags |= H2_SF_KILL_CONN;
4217
Willy Tarreau7838a792019-08-12 18:42:03 +02004218 if (mode)
4219 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004220
Willy Tarreau7838a792019-08-12 18:42:03 +02004221 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004222}
4223
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004224/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004225static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4226{
4227 struct h2s *h2s = cs->ctx;
4228
Willy Tarreau7838a792019-08-12 18:42:03 +02004229 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004230 if (cs->flags & CS_FL_KILL_CONN)
4231 h2s->flags |= H2_SF_KILL_CONN;
4232
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004233 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004234 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004235}
4236
Christopher Faulet9b79a102019-07-15 11:22:56 +02004237/* Decode the payload of a HEADERS frame and produce the HTX request or response
4238 * depending on the connection's side. Returns a positive value on success, a
4239 * negative value on failure, or 0 if it couldn't proceed. May report connection
4240 * errors in h2c->errcode if the frame is non-decodable and the connection
4241 * unrecoverable. In absence of connection error when a failure is reported, the
4242 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004243 *
4244 * The function may fold CONTINUATION frames into the initial HEADERS frame
4245 * by removing padding and next frame header, then moving the CONTINUATION
4246 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4247 * leaving a hole between the main frame and the beginning of the next one.
4248 * The possibly remaining incomplete or next frame at the end may be moved
4249 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4250 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4251 *
4252 * A buffer at the beginning of processing may look like this :
4253 *
4254 * ,---.---------.-----.--------------.--------------.------.---.
4255 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4256 * `---^---------^-----^--------------^--------------^------^---'
4257 * | | <-----> | |
4258 * area | dpl | wrap
4259 * |<--------------> |
4260 * | dfl |
4261 * |<-------------------------------------------------->|
4262 * head data
4263 *
4264 * Padding is automatically overwritten when folding, participating to the
4265 * hole size after dfl :
4266 *
4267 * ,---.------------------------.-----.--------------.------.---.
4268 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4269 * `---^------------------------^-----^--------------^------^---'
4270 * | | <-----> | |
4271 * area | hole | wrap
4272 * |<-----------------------> |
4273 * | dfl |
4274 * |<-------------------------------------------------->|
4275 * head data
4276 *
4277 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4278 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4279 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004280 *
4281 * The <flags> field must point to either the stream's flags or to a copy of it
4282 * so that the function can update the following flags :
4283 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004284 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004285 *
4286 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4287 * decoding, in order to detect if we're dealing with a headers or a trailers
4288 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004289 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01004290static 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 +02004291{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004292 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004293 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004294 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004295 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004296 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004297 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004298 int flen; // header frame len
4299 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004300 int ret = 0;
4301 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004302 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004303
Willy Tarreau7838a792019-08-12 18:42:03 +02004304 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4305
Willy Tarreauea18f862018-12-22 20:19:26 +01004306next_frame:
4307 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4308 goto leave; // incomplete input frame
4309
4310 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4311 * this case, we'll try to paste it immediately after the initial
4312 * HEADERS frame payload and kill any possible padding. The initial
4313 * frame's length will be increased to represent the concatenation
4314 * of the two frames. The next frame is read from position <tlen>
4315 * and written at position <flen> (minus padding if some is present).
4316 */
4317 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4318 struct h2_fh hdr;
4319 int clen; // CONTINUATION frame's payload length
4320
Willy Tarreau7838a792019-08-12 18:42:03 +02004321 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 +01004322 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4323 /* no more data, the buffer may be full, either due to
4324 * too large a frame or because of too large a hole that
4325 * we're going to compact at the end.
4326 */
4327 goto leave;
4328 }
4329
4330 if (hdr.ft != H2_FT_CONTINUATION) {
4331 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004332 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 +01004333 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4334 goto fail;
4335 }
4336
4337 if (hdr.sid != h2c->dsi) {
4338 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004339 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 +01004340 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4341 goto fail;
4342 }
4343
4344 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4345 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004346 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 +01004347 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4348 goto fail;
4349 }
4350
4351 /* detect when we must stop aggragating frames */
4352 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4353
4354 /* Take as much as we can of the CONTINUATION frame's payload */
4355 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4356 if (clen > hdr.len)
4357 clen = hdr.len;
4358
4359 /* Move the frame's payload over the padding, hole and frame
4360 * header. At least one of hole or dpl is null (see diagrams
4361 * above). The hole moves after the new aggragated frame.
4362 */
4363 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4364 h2c->dfl += clen - h2c->dpl;
4365 hole += h2c->dpl + 9;
4366 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004367 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 +01004368 goto next_frame;
4369 }
4370
4371 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004372
Willy Tarreau13278b42017-10-13 19:23:14 +02004373 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004374 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004375 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004376 copy = alloc_trash_chunk();
4377 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004378 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 +02004379 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4380 goto fail;
4381 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004382 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4383 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4384 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004385 }
4386
Willy Tarreau13278b42017-10-13 19:23:14 +02004387 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4388 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004389 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004390 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004391 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 +01004392 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004393 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004394 }
4395
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004396 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004397 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 +01004398 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4399 goto fail;
4400 }
4401
Willy Tarreau13278b42017-10-13 19:23:14 +02004402 hdrs += 5; // stream dep = 4, weight = 1
4403 flen -= 5;
4404 }
4405
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004406 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004407 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 +01004408 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004409 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004410 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004411
Willy Tarreau937f7602018-02-26 15:22:17 +01004412 /* we can't retry a failed decompression operation so we must be very
4413 * careful not to take any risks. In practice the output buffer is
4414 * always empty except maybe for trailers, in which case we simply have
4415 * to wait for the upper layer to finish consuming what is available.
4416 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004417 htx = htx_from_buf(rxbuf);
4418 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004419 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 +02004420 h2c->flags |= H2_CF_DEM_SFULL;
4421 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004422 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004423
Willy Tarreau25919232019-01-03 14:48:18 +01004424 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004425 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4426 sizeof(list)/sizeof(list[0]), tmp);
4427 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004428 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 +01004429 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4430 goto fail;
4431 }
4432
Willy Tarreau25919232019-01-03 14:48:18 +01004433 /* The PACK decompressor was updated, let's update the input buffer and
4434 * the parser's state to commit these changes and allow us to later
4435 * fail solely on the stream if needed.
4436 */
4437 b_del(&h2c->dbuf, h2c->dfl + hole);
4438 h2c->dfl = hole = 0;
4439 h2c->st0 = H2_CS_FRAME_H;
4440
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004441 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004442 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004443
Willy Tarreau88d138e2019-01-02 19:38:14 +01004444 if (*flags & H2_SF_HEADERS_RCVD)
4445 goto trailers;
4446
4447 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004448 if (h2c->flags & H2_CF_IS_BACK)
4449 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
4450 else
4451 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004452
4453 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004454 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004455 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 +01004456 goto fail;
4457 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004458
Willy Tarreau174b06a2018-04-25 18:13:58 +02004459 if (msgf & H2_MSGF_BODY) {
4460 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004461 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004462 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004463 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004464 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004465 }
4466
Willy Tarreau88d138e2019-01-02 19:38:14 +01004467 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004468 /* indicate that a HEADERS frame was received for this stream, except
4469 * for 1xx responses. For 1xx responses, another HEADERS frame is
4470 * expected.
4471 */
4472 if (!(msgf & H2_MSGF_RSP_1XX))
4473 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004474
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02004475 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004476 /* Mark the end of message using EOM */
Christopher Faulet810df062020-07-22 16:20:34 +02004477 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004478 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
4479 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 +02004480 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004481 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004482 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004483
Willy Tarreau86277d42019-01-02 15:36:11 +01004484 /* success */
4485 ret = 1;
4486
Willy Tarreau68dd9852017-07-03 14:44:26 +02004487 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004488 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004489 * move the remaining data over it.
4490 */
4491 if (hole) {
4492 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4493 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4494 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4495 b_sub(&h2c->dbuf, hole);
4496 }
4497
Willy Tarreau97215ca2019-04-29 10:20:21 +02004498 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004499 /* too large frames */
4500 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004501 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004502 }
4503
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004504 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004505 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004506 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004507 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004508 return ret;
4509
Willy Tarreau68dd9852017-07-03 14:44:26 +02004510 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004511 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004512 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004513
4514 trailers:
4515 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004516 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4517 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004518 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 +01004519 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4520 goto fail;
4521 }
4522
Christopher Faulet9b79a102019-07-15 11:22:56 +02004523 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004524 if (h2_make_htx_trailers(list, htx) <= 0) {
4525 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 +02004526 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004527 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004528 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004529}
4530
Christopher Faulet9b79a102019-07-15 11:22:56 +02004531/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004532 * parser state is automatically updated. Returns > 0 if it could completely
4533 * send the current frame, 0 if it couldn't complete, in which case
4534 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4535 * DATA frame can return 0 as a valid result). Stream errors are reported in
4536 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4537 * have checked the frame header and ensured that the frame was complete or the
4538 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004539 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004540static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004541{
4542 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004543 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004544 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004545 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004546 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004547 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004548
Willy Tarreau7838a792019-08-12 18:42:03 +02004549 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4550
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004551 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004552
Olivier Houchard638b7992018-08-16 15:41:52 +02004553 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004554 if (!csbuf) {
4555 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004556 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 +01004557 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004558 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004559 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004560
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004561try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004562 flen = h2c->dfl - h2c->dpl;
4563 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004564 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004565
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004566 if (flen > b_data(&h2c->dbuf)) {
4567 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004568 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004569 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004570 }
4571
Christopher Faulet9b79a102019-07-15 11:22:56 +02004572 block = htx_free_data_space(htx);
4573 if (!block) {
4574 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004575 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 +02004576 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004577 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004578 if (flen > block)
4579 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004580
Christopher Faulet9b79a102019-07-15 11:22:56 +02004581 /* here, flen is the max we can copy into the output buffer */
4582 block = b_contig_data(&h2c->dbuf, 0);
4583 if (flen > block)
4584 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004585
Christopher Faulet9b79a102019-07-15 11:22:56 +02004586 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004587 TRACE_DATA("move some data to h2s rxbuf", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s, 0, (void *)(long)sent);
Willy Tarreau454f9052017-10-26 19:40:35 +02004588
Christopher Faulet9b79a102019-07-15 11:22:56 +02004589 b_del(&h2c->dbuf, sent);
4590 h2c->dfl -= sent;
4591 h2c->rcvd_c += sent;
4592 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004593
Christopher Faulet9b79a102019-07-15 11:22:56 +02004594 if (h2s->flags & H2_SF_DATA_CLEN) {
4595 h2s->body_len -= sent;
4596 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004597 }
4598
Christopher Faulet9b79a102019-07-15 11:22:56 +02004599 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004600 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004601 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 +01004602 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004603 }
4604
Christopher Faulet9b79a102019-07-15 11:22:56 +02004605 goto try_again;
4606
Willy Tarreau4a28da12018-01-04 14:41:00 +01004607 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004608 /* here we're done with the frame, all the payload (except padding) was
4609 * transferred.
4610 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004611
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004612 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Faulet810df062020-07-22 16:20:34 +02004613 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004614 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004615 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 +02004616 h2c->flags |= H2_CF_DEM_SFULL;
4617 goto fail;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004618 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004619 }
4620
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004621 h2c->rcvd_c += h2c->dpl;
4622 h2c->rcvd_s += h2c->dpl;
4623 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004624 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004625 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004626 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004627 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004628 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004629 if (htx)
4630 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004631 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004632 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004633}
4634
Willy Tarreau115e83b2018-12-01 19:17:53 +01004635/* Try to send a HEADERS frame matching HTX response present in HTX message
4636 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4637 * must check the stream's status to detect any error which might have happened
4638 * subsequently to a successful send. The htx blocks are automatically removed
4639 * from the message. The htx message is assumed to be valid since produced from
4640 * the internal code, hence it contains a start line, an optional series of
4641 * header blocks and an end of header, otherwise an invalid frame could be
4642 * emitted and the resulting htx message could be left in an inconsistent state.
4643 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004644static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004645{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004646 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004647 struct h2c *h2c = h2s->h2c;
4648 struct htx_blk *blk;
4649 struct htx_blk *blk_end;
4650 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004651 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004652 struct htx_sl *sl;
4653 enum htx_blk_type type;
4654 int es_now = 0;
4655 int ret = 0;
4656 int hdr;
4657 int idx;
4658
Willy Tarreau7838a792019-08-12 18:42:03 +02004659 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4660
Willy Tarreau115e83b2018-12-01 19:17:53 +01004661 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004662 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004663 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004664 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004665 return 0;
4666 }
4667
Willy Tarreau115e83b2018-12-01 19:17:53 +01004668 /* determine the first block which must not be deleted, blk_end may
4669 * be NULL if all blocks have to be deleted.
4670 */
4671 idx = htx_get_head(htx);
4672 blk_end = NULL;
4673 while (idx != -1) {
4674 type = htx_get_blk_type(htx_get_blk(htx, idx));
4675 idx = htx_get_next(htx, idx);
4676 if (type == HTX_BLK_EOH) {
4677 if (idx != -1)
4678 blk_end = htx_get_blk(htx, idx);
4679 break;
4680 }
4681 }
4682
4683 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004684 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004685 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_RES_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004686 ALREADY_CHECKED(blk);
4687 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004688 h2s->status = sl->info.res.status;
Willy Tarreau7838a792019-08-12 18:42:03 +02004689 if (h2s->status < 100 || h2s->status > 999) {
4690 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 +01004691 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004692 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004693
4694 /* and the rest of the headers, that we dump starting at header 0 */
4695 hdr = 0;
4696
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004697 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004698 while ((idx = htx_get_next(htx, idx)) != -1) {
4699 blk = htx_get_blk(htx, idx);
4700 type = htx_get_blk_type(blk);
4701
4702 if (type == HTX_BLK_UNUSED)
4703 continue;
4704
4705 if (type != HTX_BLK_HDR)
4706 break;
4707
Willy Tarreau7838a792019-08-12 18:42:03 +02004708 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4709 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 +01004710 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004711 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004712
4713 list[hdr].n = htx_get_blk_name(htx, blk);
4714 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004715 hdr++;
4716 }
4717
4718 /* marker for end of headers */
4719 list[hdr].n = ist("");
4720
4721 if (h2s->status == 204 || h2s->status == 304) {
4722 /* no contents, claim c-len is present and set to zero */
4723 es_now = 1;
4724 }
4725
Willy Tarreau9c218e72019-05-26 10:08:28 +02004726 mbuf = br_tail(h2c->mbuf);
4727 retry:
4728 if (!h2_get_buf(h2c, mbuf)) {
4729 h2c->flags |= H2_CF_MUX_MALLOC;
4730 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004731 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 +02004732 return 0;
4733 }
4734
Willy Tarreau115e83b2018-12-01 19:17:53 +01004735 chunk_reset(&outbuf);
4736
4737 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004738 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4739 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004740 break;
4741 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004742 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004743 }
4744
4745 if (outbuf.size < 9)
4746 goto full;
4747
4748 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4749 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4750 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4751 outbuf.data = 9;
4752
4753 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004754 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004755 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004756 goto realign_again;
4757 goto full;
4758 }
4759
4760 /* encode all headers, stop at empty name */
4761 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4762 /* these ones do not exist in H2 and must be dropped. */
4763 if (isteq(list[hdr].n, ist("connection")) ||
4764 isteq(list[hdr].n, ist("proxy-connection")) ||
4765 isteq(list[hdr].n, ist("keep-alive")) ||
4766 isteq(list[hdr].n, ist("upgrade")) ||
4767 isteq(list[hdr].n, ist("transfer-encoding")))
4768 continue;
4769
Christopher Faulet86d144c2019-08-14 16:32:25 +02004770 /* Skip all pseudo-headers */
4771 if (*(list[hdr].n.ptr) == ':')
4772 continue;
4773
Willy Tarreau115e83b2018-12-01 19:17:53 +01004774 if (isteq(list[hdr].n, ist("")))
4775 break; // end
4776
4777 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4778 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004779 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004780 goto realign_again;
4781 goto full;
4782 }
4783 }
4784
Willy Tarreaucb985a42019-10-07 16:56:34 +02004785 /* update the frame's size */
4786 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4787
4788 if (outbuf.data > h2c->mfs + 9) {
4789 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
4790 /* output full */
4791 if (b_space_wraps(mbuf))
4792 goto realign_again;
4793 goto full;
4794 }
4795 }
4796
Christopher Faulet0b465482019-02-19 15:14:23 +01004797 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004798 * FIXME: we should also set it when we know for sure that the
4799 * content-length is zero as well as on 204/304
4800 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004801 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4802 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004803 es_now = 1;
4804
Willy Tarreau927b88b2019-03-04 08:03:25 +01004805 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004806 es_now = 1;
4807
Willy Tarreau115e83b2018-12-01 19:17:53 +01004808 if (es_now)
4809 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4810
4811 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02004812 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02004813 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004814
4815 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4816 * 1xx responses, another HEADERS frame is expected.
4817 */
4818 if (h2s->status >= 200 || h2s->status == 101)
4819 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004820
Willy Tarreau115e83b2018-12-01 19:17:53 +01004821 if (es_now) {
4822 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02004823 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 +01004824 if (h2s->st == H2_SS_OPEN)
4825 h2s->st = H2_SS_HLOC;
4826 else
4827 h2s_close(h2s);
4828 }
4829
4830 /* OK we could properly deliver the response */
4831
4832 /* remove all header blocks including the EOH and compute the
4833 * corresponding size.
4834 *
4835 * FIXME: We should remove everything when es_now is set.
4836 */
4837 ret = 0;
4838 idx = htx_get_head(htx);
4839 blk = htx_get_blk(htx, idx);
4840 while (blk != blk_end) {
4841 ret += htx_get_blksz(blk);
4842 blk = htx_remove_blk(htx, blk);
4843 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004844
Christopher Faulet316934d2019-05-15 14:22:48 +02004845 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4846 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004847 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004848 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004849 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004850 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004851 return ret;
4852 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004853 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4854 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004855 h2c->flags |= H2_CF_MUX_MFULL;
4856 h2s->flags |= H2_SF_BLK_MROOM;
4857 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004858 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 +01004859 goto end;
4860 fail:
4861 /* unparsable HTX messages, too large ones to be produced in the local
4862 * list etc go here (unrecoverable errors).
4863 */
4864 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4865 ret = 0;
4866 goto end;
4867}
4868
Willy Tarreau80739692018-10-05 11:35:57 +02004869/* Try to send a HEADERS frame matching HTX request present in HTX message
4870 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4871 * must check the stream's status to detect any error which might have happened
4872 * subsequently to a successful send. The htx blocks are automatically removed
4873 * from the message. The htx message is assumed to be valid since produced from
4874 * the internal code, hence it contains a start line, an optional series of
4875 * header blocks and an end of header, otherwise an invalid frame could be
4876 * emitted and the resulting htx message could be left in an inconsistent state.
4877 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004878static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02004879{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004880 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02004881 struct h2c *h2c = h2s->h2c;
4882 struct htx_blk *blk;
4883 struct htx_blk *blk_end;
4884 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004885 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02004886 struct htx_sl *sl;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004887 struct ist meth, uri, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02004888 enum htx_blk_type type;
4889 int es_now = 0;
4890 int ret = 0;
4891 int hdr;
4892 int idx;
4893
Willy Tarreau7838a792019-08-12 18:42:03 +02004894 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4895
Willy Tarreau80739692018-10-05 11:35:57 +02004896 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004897 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004898 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004899 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004900 return 0;
4901 }
4902
Willy Tarreau80739692018-10-05 11:35:57 +02004903 /* determine the first block which must not be deleted, blk_end may
4904 * be NULL if all blocks have to be deleted.
4905 */
4906 idx = htx_get_head(htx);
4907 blk_end = NULL;
4908 while (idx != -1) {
4909 type = htx_get_blk_type(htx_get_blk(htx, idx));
4910 idx = htx_get_next(htx, idx);
4911 if (type == HTX_BLK_EOH) {
4912 if (idx != -1)
4913 blk_end = htx_get_blk(htx, idx);
4914 break;
4915 }
4916 }
4917
4918 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004919 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004920 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004921 ALREADY_CHECKED(blk);
4922 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004923 meth = htx_sl_req_meth(sl);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004924 uri = htx_sl_req_uri(sl);
4925 if (unlikely(uri.len == 0)) {
4926 TRACE_PROTO("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4927 goto fail;
4928 }
Willy Tarreau80739692018-10-05 11:35:57 +02004929
4930 /* and the rest of the headers, that we dump starting at header 0 */
4931 hdr = 0;
4932
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004933 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02004934 while ((idx = htx_get_next(htx, idx)) != -1) {
4935 blk = htx_get_blk(htx, idx);
4936 type = htx_get_blk_type(blk);
4937
4938 if (type == HTX_BLK_UNUSED)
4939 continue;
4940
4941 if (type != HTX_BLK_HDR)
4942 break;
4943
Willy Tarreau7838a792019-08-12 18:42:03 +02004944 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4945 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 +02004946 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004947 }
Willy Tarreau80739692018-10-05 11:35:57 +02004948
4949 list[hdr].n = htx_get_blk_name(htx, blk);
4950 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02004951
4952 /* Skip header if same name is used to add the server name */
4953 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
4954 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
4955 continue;
4956
Willy Tarreau80739692018-10-05 11:35:57 +02004957 hdr++;
4958 }
4959
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02004960 /* Now add the server name to a header (if requested) */
4961 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
4962 struct server *srv = objt_server(h2c->conn->target);
4963
4964 if (srv) {
4965 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
4966 list[hdr].v = ist(srv->id);
4967 hdr++;
4968 }
4969 }
4970
Willy Tarreau80739692018-10-05 11:35:57 +02004971 /* marker for end of headers */
4972 list[hdr].n = ist("");
4973
Willy Tarreau9c218e72019-05-26 10:08:28 +02004974 mbuf = br_tail(h2c->mbuf);
4975 retry:
4976 if (!h2_get_buf(h2c, mbuf)) {
4977 h2c->flags |= H2_CF_MUX_MALLOC;
4978 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004979 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 +02004980 return 0;
4981 }
4982
Willy Tarreau80739692018-10-05 11:35:57 +02004983 chunk_reset(&outbuf);
4984
4985 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004986 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4987 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004988 break;
4989 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004990 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02004991 }
4992
4993 if (outbuf.size < 9)
4994 goto full;
4995
4996 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4997 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4998 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4999 outbuf.data = 9;
5000
5001 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01005002 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005003 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005004 goto realign_again;
5005 goto full;
5006 }
5007
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005008 auth = ist(NULL);
5009
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005010 /* RFC7540 #8.3: the CONNECT method must have :
5011 * - :authority set to the URI part (host:port)
5012 * - :method set to CONNECT
5013 * - :scheme and :path omitted
5014 */
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005015 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT)) {
5016 auth = uri;
5017
5018 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
5019 /* output full */
5020 if (b_space_wraps(mbuf))
5021 goto realign_again;
5022 goto full;
5023 }
5024 } else {
5025 /* other methods need a :scheme. If an authority is known from
5026 * the request line, it must be sent, otherwise only host is
5027 * sent. Host is never sent as the authority.
5028 */
5029 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005030
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005031 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5032 /* the URI seems to start with a scheme */
5033 int len = 1;
5034
5035 while (len < uri.len && uri.ptr[len] != ':')
5036 len++;
5037
5038 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5039 /* make the uri start at the authority now */
5040 scheme.ptr = uri.ptr;
5041 scheme.len = len,
5042 uri.ptr += len + 3;
5043 uri.len -= len + 3;
5044
5045 /* find the auth part of the URI */
5046 auth.ptr = uri.ptr;
5047 auth.len = 0;
5048 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5049 auth.len++;
5050
5051 uri.ptr += auth.len;
5052 uri.len -= auth.len;
5053 }
5054 }
5055
5056 if (!scheme.len) {
5057 /* no explicit scheme, we're using an origin-form URI,
5058 * probably from an H1 request transcoded to H2 via an
5059 * external layer, then received as H2 without authority.
5060 * So we have to look up the scheme from the HTX flags.
5061 * In such a case only http and https are possible, and
5062 * https is the default (sent by browsers).
5063 */
5064 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5065 scheme = ist("http");
5066 else
5067 scheme = ist("https");
5068 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005069
5070 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005071 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005072 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005073 goto realign_again;
5074 goto full;
5075 }
Willy Tarreau80739692018-10-05 11:35:57 +02005076
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005077 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005078 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005079 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005080 goto realign_again;
5081 goto full;
5082 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005083
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005084 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5085 * be sent as '/' or '*'.
5086 */
5087 if (unlikely(!uri.len)) {
5088 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5089 uri = ist("*");
5090 else
5091 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005092 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005093
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005094 if (!hpack_encode_path(&outbuf, uri)) {
5095 /* output full */
5096 if (b_space_wraps(mbuf))
5097 goto realign_again;
5098 goto full;
5099 }
Willy Tarreau80739692018-10-05 11:35:57 +02005100 }
5101
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005102 /* encode all headers, stop at empty name. Host is only sent if we
5103 * do not provide an authority.
5104 */
Willy Tarreau80739692018-10-05 11:35:57 +02005105 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005106 struct ist n = list[hdr].n;
5107 struct ist v = list[hdr].v;
5108
Willy Tarreau80739692018-10-05 11:35:57 +02005109 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005110 if (isteq(n, ist("connection")) ||
5111 (auth.len && isteq(n, ist("host"))) ||
5112 isteq(n, ist("proxy-connection")) ||
5113 isteq(n, ist("keep-alive")) ||
5114 isteq(n, ist("upgrade")) ||
5115 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005116 continue;
5117
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005118 if (isteq(n, ist("te"))) {
5119 /* "te" may only be sent with "trailers" if this value
5120 * is present, otherwise it must be deleted.
5121 */
5122 v = istist(v, ist("trailers"));
5123 if (!v.ptr || (v.len > 8 && v.ptr[8] != ','))
5124 continue;
5125 v = ist("trailers");
5126 }
5127
Christopher Faulet86d144c2019-08-14 16:32:25 +02005128 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005129 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005130 continue;
5131
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005132 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005133 break; // end
5134
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005135 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005136 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005137 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005138 goto realign_again;
5139 goto full;
5140 }
5141 }
5142
Willy Tarreaucb985a42019-10-07 16:56:34 +02005143 /* update the frame's size */
5144 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5145
5146 if (outbuf.data > h2c->mfs + 9) {
5147 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5148 /* output full */
5149 if (b_space_wraps(mbuf))
5150 goto realign_again;
5151 goto full;
5152 }
5153 }
5154
Willy Tarreau80739692018-10-05 11:35:57 +02005155 /* we may need to add END_STREAM if we have no body :
5156 * - request already closed, or :
5157 * - no transfer-encoding, and :
5158 * - no content-length or content-length:0
5159 * Fixme: this doesn't take into account CONNECT requests.
5160 */
5161 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
5162 es_now = 1;
5163
5164 if (sl->flags & HTX_SL_F_BODYLESS)
5165 es_now = 1;
5166
Willy Tarreau927b88b2019-03-04 08:03:25 +01005167 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02005168 es_now = 1;
5169
Willy Tarreau80739692018-10-05 11:35:57 +02005170 if (es_now)
5171 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5172
5173 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005174 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005175 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005176 h2s->flags |= H2_SF_HEADERS_SENT;
5177 h2s->st = H2_SS_OPEN;
5178
Willy Tarreau80739692018-10-05 11:35:57 +02005179 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005180 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 +02005181 // trim any possibly pending data (eg: inconsistent content-length)
5182 h2s->flags |= H2_SF_ES_SENT;
5183 h2s->st = H2_SS_HLOC;
5184 }
5185
5186 /* remove all header blocks including the EOH and compute the
5187 * corresponding size.
5188 *
5189 * FIXME: We should remove everything when es_now is set.
5190 */
5191 ret = 0;
5192 idx = htx_get_head(htx);
5193 blk = htx_get_blk(htx, idx);
5194 while (blk != blk_end) {
5195 ret += htx_get_blksz(blk);
5196 blk = htx_remove_blk(htx, blk);
5197 }
5198
Christopher Faulet316934d2019-05-15 14:22:48 +02005199 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5200 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02005201 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02005202 }
Willy Tarreau80739692018-10-05 11:35:57 +02005203
5204 end:
5205 return ret;
5206 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005207 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5208 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005209 h2c->flags |= H2_CF_MUX_MFULL;
5210 h2s->flags |= H2_SF_BLK_MROOM;
5211 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005212 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 +02005213 goto end;
5214 fail:
5215 /* unparsable HTX messages, too large ones to be produced in the local
5216 * list etc go here (unrecoverable errors).
5217 */
5218 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5219 ret = 0;
5220 goto end;
5221}
5222
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005223/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005224 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5225 * caller must check the stream's status to detect any error which might have
5226 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02005227 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005228 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005229static size_t h2s_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005230{
5231 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005232 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005233 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005234 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005235 size_t total = 0;
5236 int es_now = 0;
5237 int bsize; /* htx block size */
5238 int fsize; /* h2 frame size */
5239 struct htx_blk *blk;
5240 enum htx_blk_type type;
5241 int idx;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005242 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005243
Willy Tarreau7838a792019-08-12 18:42:03 +02005244 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5245
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005246 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005247 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005248 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005249 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005250 goto end;
5251 }
5252
Willy Tarreau98de12a2018-12-12 07:03:00 +01005253 htx = htx_from_buf(buf);
5254
Christopher Faulet54b5e212019-06-04 10:08:28 +02005255 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
5256 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
5257 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005258 */
5259
5260 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005261 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005262 goto end;
5263
5264 idx = htx_get_head(htx);
5265 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02005266 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005267 bsize = htx_get_blksz(blk);
5268 fsize = bsize;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005269 trunc_out = 0;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005270
Christopher Faulet54b5e212019-06-04 10:08:28 +02005271 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01005272 if (h2s->flags & H2_SF_ES_SENT) {
5273 /* ES already sent */
5274 htx_remove_blk(htx, blk);
5275 total++; // EOM counts as one byte
5276 count--;
5277 goto end;
5278 }
5279 }
5280 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005281 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005282
Willy Tarreau9c218e72019-05-26 10:08:28 +02005283 mbuf = br_tail(h2c->mbuf);
5284 retry:
5285 if (!h2_get_buf(h2c, mbuf)) {
5286 h2c->flags |= H2_CF_MUX_MALLOC;
5287 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005288 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 +02005289 goto end;
5290 }
5291
Willy Tarreau98de12a2018-12-12 07:03:00 +01005292 /* Perform some optimizations to reduce the number of buffer copies.
5293 * First, if the mux's buffer is empty and the htx area contains
5294 * exactly one data block of the same size as the requested count, and
5295 * this count fits within the frame size, the stream's window size, and
5296 * the connection's window size, then it's possible to simply swap the
5297 * caller's buffer with the mux's output buffer and adjust offsets and
5298 * length to match the entire DATA HTX block in the middle. In this
5299 * case we perform a true zero-copy operation from end-to-end. This is
5300 * the situation that happens all the time with large files. Second, if
5301 * this is not possible, but the mux's output buffer is empty, we still
5302 * have an opportunity to avoid the copy to the intermediary buffer, by
5303 * making the intermediary buffer's area point to the output buffer's
5304 * area. In this case we want to skip the HTX header to make sure that
5305 * copies remain aligned and that this operation remains possible all
5306 * the time. This goes for headers, data blocks and any data extracted
5307 * from the HTX blocks.
5308 */
5309 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005310 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005311 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005312 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005313
Willy Tarreaubcc45952019-05-26 10:05:50 +02005314 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005315 /* Too bad there are data left there. We're willing to memcpy/memmove
5316 * up to 1/4 of the buffer, which means that it's OK to copy a large
5317 * frame into a buffer containing few data if it needs to be realigned,
5318 * and that it's also OK to copy few data without realigning. Otherwise
5319 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005320 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005321 if (fsize + 9 <= b_room(mbuf) &&
5322 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005323 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5324 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 +01005325 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005326 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005327
Willy Tarreau9c218e72019-05-26 10:08:28 +02005328 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5329 goto retry;
5330
Willy Tarreau98de12a2018-12-12 07:03:00 +01005331 h2c->flags |= H2_CF_MUX_MFULL;
5332 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005333 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 +01005334 goto end;
5335 }
5336
5337 /* map an H2 frame to the HTX block so that we can put the
5338 * frame header there.
5339 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005340 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5341 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005342
5343 /* prepend an H2 DATA frame header just before the DATA block */
5344 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5345 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5346 h2_set_frame_size(outbuf.area, fsize);
5347
5348 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005349 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005350 h2c->mws -= fsize;
5351
5352 /* and exchange with our old area */
5353 buf->area = old_area;
5354 buf->data = buf->head = 0;
5355 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005356
5357 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 +01005358 goto end;
5359 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005360
Willy Tarreau98de12a2018-12-12 07:03:00 +01005361 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005362 /* for DATA and EOM we'll have to emit a frame, even if empty */
5363
5364 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005365 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5366 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005367 break;
5368 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005369 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005370 }
5371
5372 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005373 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5374 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005375 h2c->flags |= H2_CF_MUX_MFULL;
5376 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005377 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005378 goto end;
5379 }
5380
5381 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5382 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5383 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5384 outbuf.data = 9;
5385
5386 /* we have in <fsize> the exact number of bytes we need to copy from
5387 * the HTX buffer. We need to check this against the connection's and
5388 * the stream's send windows, and to ensure that this fits in the max
5389 * frame size and in the buffer's available space minus 9 bytes (for
5390 * the frame header). The connection's flow control is applied last so
5391 * that we can use a separate list of streams which are immediately
5392 * unblocked on window opening. Note: we don't implement padding.
5393 */
5394
5395 /* EOM is presented with bsize==1 but would lead to the emission of an
5396 * empty frame, thus we force it to zero here.
5397 */
5398 if (type == HTX_BLK_EOM)
5399 bsize = fsize = 0;
5400
5401 if (!fsize)
5402 goto send_empty;
5403
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005404 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005405 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005406 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005407 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005408 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005409 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 +01005410 goto end;
5411 }
5412
Willy Tarreauee573762018-12-04 15:25:57 +01005413 if (fsize > count)
5414 fsize = count;
5415
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005416 if (fsize > h2s_mws(h2s))
5417 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005418
5419 if (h2c->mfs && fsize > h2c->mfs)
5420 fsize = h2c->mfs; // >0
5421
5422 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005423 /* It doesn't fit at once. If it at least fits once split and
5424 * the amount of data to move is low, let's defragment the
5425 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005426 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005427 if (b_space_wraps(mbuf) &&
5428 (fsize + 9 <= b_room(mbuf)) &&
5429 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005430 goto realign_again;
5431 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005432 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005433
5434 if (fsize <= 0) {
5435 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005436 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5437 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005438 h2c->flags |= H2_CF_MUX_MFULL;
5439 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005440 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005441 goto end;
5442 }
5443 }
5444
5445 if (h2c->mws <= 0) {
5446 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005447 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 +01005448 goto end;
5449 }
5450
5451 if (fsize > h2c->mws)
5452 fsize = h2c->mws;
5453
5454 /* now let's copy this this into the output buffer */
5455 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005456 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005457 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005458 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005459
5460 send_empty:
5461 /* update the frame's size */
5462 h2_set_frame_size(outbuf.area, fsize);
5463
5464 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5465 * meeting EOM. We should optimize this later.
5466 */
5467 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005468 total++; // EOM counts as one byte
5469 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005470 es_now = 1;
5471 }
5472
5473 if (es_now)
5474 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5475
5476 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005477 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005478
5479 /* consume incoming HTX block, including EOM */
5480 total += fsize;
5481 if (fsize == bsize) {
5482 htx_remove_blk(htx, blk);
Willy Tarreau7838a792019-08-12 18:42:03 +02005483 if (fsize) {
5484 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 +01005485 goto new_frame;
Willy Tarreau7838a792019-08-12 18:42:03 +02005486 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005487 } else {
5488 /* we've truncated this block */
5489 htx_cut_data_blk(htx, blk, fsize);
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005490 if (trunc_out)
5491 goto new_frame;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005492 }
5493
5494 if (es_now) {
5495 if (h2s->st == H2_SS_OPEN)
5496 h2s->st = H2_SS_HLOC;
5497 else
5498 h2s_close(h2s);
5499
5500 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005501 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 +01005502 }
5503
5504 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005505 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005506 return total;
5507}
5508
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005509/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5510 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5511 * processed. The caller must check the stream's status to detect any error
5512 * which might have happened subsequently to a successful send. The htx blocks
5513 * are automatically removed from the message. The htx message is assumed to be
5514 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005515 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005516 * as a single frame. The ES flag is always set.
5517 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005518static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005519{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005520 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005521 struct h2c *h2c = h2s->h2c;
5522 struct htx_blk *blk;
5523 struct htx_blk *blk_end;
5524 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005525 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005526 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005527 int ret = 0;
5528 int hdr;
5529 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005530
Willy Tarreau7838a792019-08-12 18:42:03 +02005531 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5532
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005533 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005534 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005535 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005536 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005537 goto end;
5538 }
5539
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005540 /* determine the first block which must not be deleted, blk_end may
5541 * be NULL if all blocks have to be deleted. also get trailers.
5542 */
5543 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005544 blk_end = NULL;
5545
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005546 hdr = 0;
5547 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005548 blk = htx_get_blk(htx, idx);
5549 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005550 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005551 if (type == HTX_BLK_UNUSED)
5552 continue;
5553
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005554 if (type == HTX_BLK_EOT) {
5555 if (idx != -1)
5556 blk_end = blk;
5557 break;
5558 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005559 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005560 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005561
Willy Tarreau7838a792019-08-12 18:42:03 +02005562 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5563 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 +01005564 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005565 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005566
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005567 list[hdr].n = htx_get_blk_name(htx, blk);
5568 list[hdr].v = htx_get_blk_value(htx, blk);
5569 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005570 }
5571
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005572 /* marker for end of trailers */
5573 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005574
Willy Tarreau9c218e72019-05-26 10:08:28 +02005575 mbuf = br_tail(h2c->mbuf);
5576 retry:
5577 if (!h2_get_buf(h2c, mbuf)) {
5578 h2c->flags |= H2_CF_MUX_MALLOC;
5579 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005580 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 +02005581 goto end;
5582 }
5583
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005584 chunk_reset(&outbuf);
5585
5586 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005587 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5588 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005589 break;
5590 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005591 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005592 }
5593
5594 if (outbuf.size < 9)
5595 goto full;
5596
5597 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5598 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5599 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5600 outbuf.data = 9;
5601
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005602 /* encode all headers */
5603 for (idx = 0; idx < hdr; idx++) {
5604 /* these ones do not exist in H2 or must not appear in
5605 * trailers and must be dropped.
5606 */
5607 if (isteq(list[idx].n, ist("host")) ||
5608 isteq(list[idx].n, ist("content-length")) ||
5609 isteq(list[idx].n, ist("connection")) ||
5610 isteq(list[idx].n, ist("proxy-connection")) ||
5611 isteq(list[idx].n, ist("keep-alive")) ||
5612 isteq(list[idx].n, ist("upgrade")) ||
5613 isteq(list[idx].n, ist("te")) ||
5614 isteq(list[idx].n, ist("transfer-encoding")))
5615 continue;
5616
Christopher Faulet86d144c2019-08-14 16:32:25 +02005617 /* Skip all pseudo-headers */
5618 if (*(list[idx].n.ptr) == ':')
5619 continue;
5620
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005621 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5622 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005623 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005624 goto realign_again;
5625 goto full;
5626 }
5627 }
5628
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005629 if (outbuf.data == 9) {
5630 /* here we have a problem, we have nothing to emit (either we
5631 * received an empty trailers block followed or we removed its
5632 * contents above). Because of this we can't send a HEADERS
5633 * frame, so we have to cheat and instead send an empty DATA
5634 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005635 */
5636 outbuf.area[3] = H2_FT_DATA;
5637 outbuf.area[4] = H2_F_DATA_END_STREAM;
5638 }
5639
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005640 /* update the frame's size */
5641 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5642
Willy Tarreau572d9f52019-10-11 16:58:37 +02005643 if (outbuf.data > h2c->mfs + 9) {
5644 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5645 /* output full */
5646 if (b_space_wraps(mbuf))
5647 goto realign_again;
5648 goto full;
5649 }
5650 }
5651
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005652 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005653 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 +02005654 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005655 h2s->flags |= H2_SF_ES_SENT;
5656
5657 if (h2s->st == H2_SS_OPEN)
5658 h2s->st = H2_SS_HLOC;
5659 else
5660 h2s_close(h2s);
5661
5662 /* OK we could properly deliver the response */
5663 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005664 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005665 ret = 0;
5666 idx = htx_get_head(htx);
5667 blk = htx_get_blk(htx, idx);
5668 while (blk != blk_end) {
5669 ret += htx_get_blksz(blk);
5670 blk = htx_remove_blk(htx, blk);
5671 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005672
5673 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5674 ret += htx_get_blksz(blk_end);
5675 htx_remove_blk(htx, blk_end);
5676 }
5677
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005678 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005679 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005680 return ret;
5681 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005682 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5683 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005684 h2c->flags |= H2_CF_MUX_MFULL;
5685 h2s->flags |= H2_SF_BLK_MROOM;
5686 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005687 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 +01005688 goto end;
5689 fail:
5690 /* unparsable HTX messages, too large ones to be produced in the local
5691 * list etc go here (unrecoverable errors).
5692 */
5693 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5694 ret = 0;
5695 goto end;
5696}
5697
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005698/* Called from the upper layer, to subscribe <es> to events <event_type>. The
5699 * event subscriber <es> is not allowed to change from a previous call as long
5700 * as at least one event is still subscribed. The <event_type> must only be a
5701 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005702 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005703static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02005704{
Olivier Houchard6ff20392018-07-17 18:46:31 +02005705 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005706 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005707
Willy Tarreau7838a792019-08-12 18:42:03 +02005708 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005709
5710 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005711 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005712
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005713 es->events |= event_type;
5714 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005715
5716 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005717 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005718
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005719 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005720 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02005721 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5722 !LIST_ADDED(&h2s->list)) {
5723 if (h2s->flags & H2_SF_BLK_MFCTL)
5724 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5725 else
5726 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005727 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02005728 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005729 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005730 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005731}
5732
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005733/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
5734 * The <es> pointer is not allowed to differ from the one passed to the
5735 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005736 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005737static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005738{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005739 struct h2s *h2s = cs->ctx;
5740
Willy Tarreau7838a792019-08-12 18:42:03 +02005741 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005742
5743 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005744 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005745
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005746 es->events &= ~event_type;
5747 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01005748 h2s->subs = NULL;
5749
5750 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005751 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005752
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005753 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005754 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005755 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005756 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
5757 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005758 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01005759
Willy Tarreau7838a792019-08-12 18:42:03 +02005760 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005761 return 0;
5762}
5763
5764
Olivier Houchard511efea2018-08-16 15:30:32 +02005765/* Called from the upper layer, to receive data */
5766static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5767{
Olivier Houchard638b7992018-08-16 15:41:52 +02005768 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005769 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005770 struct htx *h2s_htx = NULL;
5771 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005772 size_t ret = 0;
5773
Willy Tarreau7838a792019-08-12 18:42:03 +02005774 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
5775
Olivier Houchard511efea2018-08-16 15:30:32 +02005776 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005777 h2s_htx = htx_from_buf(&h2s->rxbuf);
5778 if (htx_is_empty(h2s_htx)) {
5779 /* Here htx_to_buf() will set buffer data to 0 because
5780 * the HTX is empty.
5781 */
5782 htx_to_buf(h2s_htx, &h2s->rxbuf);
5783 goto end;
5784 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005785
Christopher Faulet9b79a102019-07-15 11:22:56 +02005786 ret = h2s_htx->data;
5787 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005788
Christopher Faulet9b79a102019-07-15 11:22:56 +02005789 /* <buf> is empty and the message is small enough, swap the
5790 * buffers. */
5791 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005792 htx_to_buf(buf_htx, buf);
5793 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02005794 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5795 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01005796 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02005797
5798 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
5799
5800 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
5801 buf_htx->flags |= HTX_FL_PARSING_ERROR;
5802 if (htx_is_empty(buf_htx))
5803 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01005804 }
Christopher Faulet810df062020-07-22 16:20:34 +02005805 else if (htx_is_empty(h2s_htx))
5806 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOI);
Olivier Houchard511efea2018-08-16 15:30:32 +02005807
Christopher Faulet9b79a102019-07-15 11:22:56 +02005808 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
5809 htx_to_buf(buf_htx, buf);
5810 htx_to_buf(h2s_htx, &h2s->rxbuf);
5811 ret -= h2s_htx->data;
5812
Christopher Faulet37070b22019-02-14 15:12:14 +01005813 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005814 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005815 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005816 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005817 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005818 if (h2s->flags & H2_SF_ES_RCVD)
5819 cs->flags |= CS_FL_EOI;
Christopher Fauletaade4ed2020-10-08 15:38:41 +02005820 if (h2c_read0_pending(h2c) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02005821 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005822 if (cs->flags & CS_FL_ERR_PENDING)
5823 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005824 if (b_size(&h2s->rxbuf)) {
5825 b_free(&h2s->rxbuf);
5826 offer_buffers(NULL, tasks_run_queue);
5827 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005828 }
5829
Willy Tarreau082f5592018-11-25 08:03:32 +01005830 if (ret && h2c->dsi == h2s->id) {
5831 /* demux is blocking on this stream's buffer */
5832 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005833 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005834 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005835
Willy Tarreau7838a792019-08-12 18:42:03 +02005836 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02005837 return ret;
5838}
5839
Olivier Houchardd846c262018-10-19 17:24:29 +02005840
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005841/* Called from the upper layer, to send data from buffer <buf> for no more than
5842 * <count> bytes. Returns the number of bytes effectively sent. Some status
5843 * flags may be updated on the conn_stream.
5844 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005845static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005846{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005847 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005848 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005849 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005850 struct htx *htx;
5851 struct htx_blk *blk;
5852 enum htx_blk_type btype;
5853 uint32_t bsize;
5854 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005855
Willy Tarreau7838a792019-08-12 18:42:03 +02005856 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
5857
Olivier Houchardd360ac62019-03-22 17:37:16 +01005858 /* If we were not just woken because we wanted to send but couldn't,
5859 * and there's somebody else that is waiting to send, do nothing,
5860 * we will subscribe later and be put at the end of the list
5861 */
Willy Tarreaud9464162020-01-10 18:25:07 +01005862 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02005863 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
5864 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 +01005865 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005866 }
Willy Tarreaud9464162020-01-10 18:25:07 +01005867 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02005868
Willy Tarreau7838a792019-08-12 18:42:03 +02005869 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
5870 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 +02005871 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005872 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02005873
Willy Tarreaucab22952019-10-31 15:48:18 +01005874 if (h2s->h2c->st0 >= H2_CS_ERROR) {
5875 cs->flags |= CS_FL_ERROR;
5876 TRACE_DEVEL("connection is in error, leaving in error", H2_EV_H2S_SEND|H2_EV_H2S_BLK|H2_EV_H2S_ERR|H2_EV_STRM_ERR, h2s->h2c->conn, h2s);
5877 return 0;
5878 }
5879
Christopher Faulet9b79a102019-07-15 11:22:56 +02005880 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005881
Willy Tarreau0bad0432018-06-14 16:54:01 +02005882 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01005883 h2s->flags |= H2_SF_OUTGOING_DATA;
5884
Willy Tarreau751f2d02018-10-05 09:35:00 +02005885 if (h2s->id == 0) {
5886 int32_t id = h2c_get_next_sid(h2s->h2c);
5887
5888 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02005889 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02005890 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 +02005891 return 0;
5892 }
5893
5894 eb32_delete(&h2s->by_id);
5895 h2s->by_id.key = h2s->id = id;
5896 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01005897 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005898 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
5899 }
5900
Christopher Faulet9b79a102019-07-15 11:22:56 +02005901 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
5902 count && !htx_is_empty(htx)) {
5903 idx = htx_get_head(htx);
5904 blk = htx_get_blk(htx, idx);
5905 btype = htx_get_blk_type(blk);
5906 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005907
Christopher Faulet9b79a102019-07-15 11:22:56 +02005908 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02005909 case HTX_BLK_REQ_SL:
5910 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005911 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02005912 if (ret > 0) {
5913 total += ret;
5914 count -= ret;
5915 if (ret < bsize)
5916 goto done;
5917 }
5918 break;
5919
Willy Tarreau115e83b2018-12-01 19:17:53 +01005920 case HTX_BLK_RES_SL:
5921 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005922 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005923 if (ret > 0) {
5924 total += ret;
5925 count -= ret;
5926 if (ret < bsize)
5927 goto done;
5928 }
5929 break;
5930
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005931 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005932 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005933 /* all these cause the emission of a DATA frame (possibly empty).
5934 * This EOM necessarily is one before trailers, as the EOM following
5935 * trailers would have been consumed by the trailers parser.
5936 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005937 ret = h2s_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005938 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01005939 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005940 total += ret;
5941 count -= ret;
5942 if (ret < bsize)
5943 goto done;
5944 }
5945 break;
5946
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005947 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005948 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005949 /* This is the first trailers block, all the subsequent ones AND
5950 * the EOM will be swallowed by the parser.
5951 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005952 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005953 if (ret > 0) {
5954 total += ret;
5955 count -= ret;
5956 if (ret < bsize)
5957 goto done;
5958 }
5959 break;
5960
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005961 default:
5962 htx_remove_blk(htx, blk);
5963 total += bsize;
5964 count -= bsize;
5965 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005966 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005967 }
5968
Christopher Faulet9b79a102019-07-15 11:22:56 +02005969 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02005970 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02005971 /* trim any possibly pending data after we close (extra CR-LF,
5972 * unprocessed trailers, abnormal extra data, ...)
5973 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005974 total += count;
5975 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02005976 }
5977
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005978 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01005979 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005980 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 +01005981 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01005982 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01005983 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005984 }
5985
Christopher Faulet9b79a102019-07-15 11:22:56 +02005986 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02005987
Olivier Houchard7505f942018-08-21 18:10:44 +02005988 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005989 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau7838a792019-08-12 18:42:03 +02005990 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 +02005991 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Olivier Houchardd846c262018-10-19 17:24:29 +02005992
Olivier Houchard7505f942018-08-21 18:10:44 +02005993 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01005994 /* If we're waiting for flow control, and we got a shutr on the
5995 * connection, we will never be unlocked, so add an error on
5996 * the conn_stream.
5997 */
5998 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
5999 !b_data(&h2s->h2c->dbuf) &&
6000 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02006001 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 +01006002 if (cs->flags & CS_FL_EOS)
6003 cs->flags |= CS_FL_ERROR;
6004 else
6005 cs->flags |= CS_FL_ERR_PENDING;
6006 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006007
Willy Tarreau5723f292020-01-10 15:16:57 +01006008 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
6009 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006010 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01006011 LIST_DEL_INIT(&h2s->list);
6012 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02006013
Willy Tarreau7838a792019-08-12 18:42:03 +02006014 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02006015 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02006016}
6017
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006018/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02006019static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006020{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01006021 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006022 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006023 struct eb32_node *node;
6024 int fctl_cnt = 0;
6025 int send_cnt = 0;
6026 int tree_cnt = 0;
6027 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006028 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006029
6030 if (!h2c)
6031 return;
6032
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006033 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006034 fctl_cnt++;
6035
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006036 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006037 send_cnt++;
6038
Willy Tarreau3af37712018-12-18 14:34:41 +01006039 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006040 node = eb32_first(&h2c->streams_by_id);
6041 while (node) {
6042 h2s = container_of(node, struct h2s, by_id);
6043 tree_cnt++;
6044 if (!h2s->cs)
6045 orph_cnt++;
6046 node = eb32_next(node);
6047 }
6048
Willy Tarreau60f62682019-05-26 11:32:27 +02006049 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006050 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006051 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006052 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006053 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6054 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006055 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006056 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006057 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006058 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6059 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6060 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006061 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6062 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6063 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006064 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6065 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006066
6067 if (h2s) {
Willy Tarreauab2ec452019-08-30 07:07:08 +02006068 chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s.flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
6069 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006070 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6071 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6072 h2s->cs);
6073 if (h2s->cs)
6074 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
6075 h2s->cs->flags, h2s->cs->data);
6076 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006077}
Willy Tarreau62f52692017-10-08 23:01:42 +02006078
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006079/* Migrate the the connection to the current thread.
6080 * Return 0 if successful, non-zero otherwise.
6081 * Expected to be called with the old thread lock held.
6082 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006083static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006084{
6085 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006086 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006087
6088 if (fd_takeover(conn->handle.fd, conn) != 0)
6089 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006090
6091 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6092 /* We failed to takeover the xprt, even if the connection may
6093 * still be valid, flag it as error'd, as we have already
6094 * taken over the fd, and wake the tasklet, so that it will
6095 * destroy it.
6096 */
6097 conn->flags |= CO_FL_ERROR;
6098 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6099 return -1;
6100 }
6101
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006102 if (h2c->wait_event.events)
6103 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6104 h2c->wait_event.events, &h2c->wait_event);
6105 /* To let the tasklet know it should free itself, and do nothing else,
6106 * set its context to NULL.
6107 */
6108 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006109 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006110
6111 task = h2c->task;
6112 if (task) {
6113 task->context = NULL;
6114 h2c->task = NULL;
6115 __ha_barrier_store();
6116 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006117
6118 h2c->task = task_new(tid_bit);
6119 if (!h2c->task) {
6120 h2_release(h2c);
6121 return -1;
6122 }
6123 h2c->task->process = h2_timeout_task;
6124 h2c->task->context = h2c;
6125 }
6126 h2c->wait_event.tasklet = tasklet_new();
6127 if (!h2c->wait_event.tasklet) {
6128 h2_release(h2c);
6129 return -1;
6130 }
6131 h2c->wait_event.tasklet->process = h2_io_cb;
6132 h2c->wait_event.tasklet->context = h2c;
6133 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6134 SUB_RETRY_RECV, &h2c->wait_event);
6135
6136 return 0;
6137}
6138
Willy Tarreau62f52692017-10-08 23:01:42 +02006139/*******************************************************/
6140/* functions below are dedicated to the config parsers */
6141/*******************************************************/
6142
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006143/* config parser for global "tune.h2.header-table-size" */
6144static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
6145 struct proxy *defpx, const char *file, int line,
6146 char **err)
6147{
6148 if (too_many_args(1, args, err, NULL))
6149 return -1;
6150
6151 h2_settings_header_table_size = atoi(args[1]);
6152 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6153 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6154 return -1;
6155 }
6156 return 0;
6157}
Willy Tarreau62f52692017-10-08 23:01:42 +02006158
Willy Tarreaue6baec02017-07-27 11:45:11 +02006159/* config parser for global "tune.h2.initial-window-size" */
6160static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
6161 struct proxy *defpx, const char *file, int line,
6162 char **err)
6163{
6164 if (too_many_args(1, args, err, NULL))
6165 return -1;
6166
6167 h2_settings_initial_window_size = atoi(args[1]);
6168 if (h2_settings_initial_window_size < 0) {
6169 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6170 return -1;
6171 }
6172 return 0;
6173}
6174
Willy Tarreau5242ef82017-07-27 11:47:28 +02006175/* config parser for global "tune.h2.max-concurrent-streams" */
6176static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
6177 struct proxy *defpx, const char *file, int line,
6178 char **err)
6179{
6180 if (too_many_args(1, args, err, NULL))
6181 return -1;
6182
6183 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006184 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006185 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6186 return -1;
6187 }
6188 return 0;
6189}
6190
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006191/* config parser for global "tune.h2.max-frame-size" */
6192static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
6193 struct proxy *defpx, const char *file, int line,
6194 char **err)
6195{
6196 if (too_many_args(1, args, err, NULL))
6197 return -1;
6198
6199 h2_settings_max_frame_size = atoi(args[1]);
6200 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6201 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6202 return -1;
6203 }
6204 return 0;
6205}
6206
Willy Tarreau62f52692017-10-08 23:01:42 +02006207
6208/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006209/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006210/***************************************/
6211
6212/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006213static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006214 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006215 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006216 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006217 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006218 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006219 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006220 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006221 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006222 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006223 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006224 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006225 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006226 .shutr = h2_shutr,
6227 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006228 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006229 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006230 .takeover = h2_takeover,
Amaury Denoyelle3d3c0912020-10-14 18:17:06 +02006231 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX|MX_FL_HOL_RISK,
Willy Tarreau62f52692017-10-08 23:01:42 +02006232 .name = "H2",
6233};
6234
Christopher Faulet32f61c02018-04-10 14:33:41 +02006235static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006236 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006237
Willy Tarreau0108d902018-11-25 19:14:37 +01006238INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6239
Willy Tarreau62f52692017-10-08 23:01:42 +02006240/* config keyword parsers */
6241static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006242 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006243 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006244 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006245 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006246 { 0, NULL, NULL }
6247}};
6248
Willy Tarreau0108d902018-11-25 19:14:37 +01006249INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006250
6251/* initialize internal structs after the config is parsed.
6252 * Returns zero on success, non-zero on error.
6253 */
6254static int init_h2()
6255{
6256 pool_head_hpack_tbl = create_pool("hpack_tbl",
6257 h2_settings_header_table_size,
6258 MEM_F_SHARED|MEM_F_EXACT);
6259 if (!pool_head_hpack_tbl)
6260 return -1;
6261 return 0;
6262}
6263
6264REGISTER_POST_CHECK(init_h2);