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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)) {
511 chunk_appendf(&trace_buf, " dft=%s/%02x", h2_ft_str(h2c->dft), h2c->dff);
512 }
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
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200554/* returns true if the connection is allowed to expire, false otherwise. A
555 * connection may expire when:
556 * - it has no stream
557 * - it has data in the mux buffer
558 * - it has streams in the blocked list
559 * - it has streams in the fctl list
560 * - it has streams in the send list
561 * Otherwise it means some streams are waiting in the data layer and it should
562 * not expire.
563 */
564static inline int h2c_may_expire(const struct h2c *h2c)
565{
566 return eb_is_empty(&h2c->streams_by_id) ||
567 br_data(h2c->mbuf) ||
568 !LIST_ISEMPTY(&h2c->blocked_list) ||
569 !LIST_ISEMPTY(&h2c->fctl_list) ||
Willy Tarreaud9464162020-01-10 18:25:07 +0100570 !LIST_ISEMPTY(&h2c->send_list);
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200571}
572
Olivier Houchard7a977432019-03-21 15:47:13 +0100573static __inline int
Willy Tarreauc2ea47f2019-10-01 10:12:00 +0200574h2c_is_dead(const struct h2c *h2c)
Olivier Houchard7a977432019-03-21 15:47:13 +0100575{
576 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
577 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
578 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
579 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200580 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100581 (conn_xprt_read0_pending(h2c->conn) ||
582 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
583 return 1;
584
585 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100586}
587
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200588/*****************************************************/
589/* functions below are for dynamic buffer management */
590/*****************************************************/
591
Willy Tarreau315d8072017-12-10 22:17:57 +0100592/* indicates whether or not the we may call the h2_recv() function to attempt
593 * to receive data into the buffer and/or demux pending data. The condition is
594 * a bit complex due to some API limits for now. The rules are the following :
595 * - if an error or a shutdown was detected on the connection and the buffer
596 * is empty, we must not attempt to receive
597 * - if the demux buf failed to be allocated, we must not try to receive and
598 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100599 * - if no flag indicates a blocking condition, we may attempt to receive,
600 * regardless of whether the demux buffer is full or not, so that only
601 * de demux part decides whether or not to block. This is needed because
602 * the connection API indeed prevents us from re-enabling receipt that is
603 * already enabled in a polled state, so we must always immediately stop
604 * as soon as the demux can't proceed so as never to hit an end of read
605 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100606 * - otherwise must may not attempt
607 */
608static inline int h2_recv_allowed(const struct h2c *h2c)
609{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200610 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100611 (h2c->st0 >= H2_CS_ERROR ||
612 h2c->conn->flags & CO_FL_ERROR ||
613 conn_xprt_read0_pending(h2c->conn)))
614 return 0;
615
616 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100617 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100618 return 1;
619
620 return 0;
621}
622
Willy Tarreau47b515a2018-12-21 16:09:41 +0100623/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200624static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100625{
626 if (!h2_recv_allowed(h2c))
627 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200628 if ((!consider_buffer || !b_data(&h2c->dbuf))
629 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100630 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200631 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100632}
633
634
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100635/* returns true if the front connection has too many conn_streams attached */
636static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200637{
Willy Tarreaua8754662018-12-23 20:43:58 +0100638 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200639}
640
Willy Tarreau44e973f2018-03-01 17:49:30 +0100641/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
642 * flags are used to figure what buffer was requested. It returns 1 if the
643 * allocation succeeds, in which case the connection is woken up, or 0 if it's
644 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200645 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100646static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200647{
648 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100649 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200650
Willy Tarreau44e973f2018-03-01 17:49:30 +0100651 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200652 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200653 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200654 return 1;
655 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200656
Willy Tarreau51330962019-05-26 09:38:07 +0200657 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100658 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200659
660 if (h2c->flags & H2_CF_DEM_MROOM) {
661 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200662 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200663 }
Willy Tarreau14398122017-09-22 14:26:04 +0200664 return 1;
665 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100666
667 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
668 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200669 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100670 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200671 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100672 return 1;
673 }
674
Willy Tarreau14398122017-09-22 14:26:04 +0200675 return 0;
676}
677
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200678static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200679{
680 struct buffer *buf = NULL;
681
Willy Tarreau21046592020-02-26 10:39:36 +0100682 if (likely(!MT_LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100683 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
684 h2c->buf_wait.target = h2c;
685 h2c->buf_wait.wakeup_cb = h2_buf_available;
Willy Tarreau86891272020-07-10 08:22:26 +0200686 MT_LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200687 }
688 return buf;
689}
690
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200691static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200692{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200693 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100694 b_free(bptr);
Willy Tarreau201840a2019-05-29 17:50:48 +0200695 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200696 }
697}
698
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200699static inline void h2_release_mbuf(struct h2c *h2c)
700{
701 struct buffer *buf;
702 unsigned int count = 0;
703
704 while (b_size(buf = br_head_pick(h2c->mbuf))) {
705 b_free(buf);
706 count++;
707 }
708 if (count)
Willy Tarreau201840a2019-05-29 17:50:48 +0200709 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200710}
711
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100712/* returns the number of allocatable outgoing streams for the connection taking
713 * the last_sid and the reserved ones into account.
714 */
715static inline int h2_streams_left(const struct h2c *h2c)
716{
717 int ret;
718
719 /* consider the number of outgoing streams we're allowed to create before
720 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
721 * nb_reserved is the number of streams which don't yet have an ID.
722 */
723 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
724 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
725 if (ret < 0)
726 ret = 0;
727 return ret;
728}
729
Willy Tarreau00f18a32019-01-26 12:19:01 +0100730/* returns the number of streams in use on a connection to figure if it's
731 * idle or not. We check nb_cs and not nb_streams as the caller will want
732 * to know if it was the last one after a detach().
733 */
734static int h2_used_streams(struct connection *conn)
735{
736 struct h2c *h2c = conn->ctx;
737
738 return h2c->nb_cs;
739}
740
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100741/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100742static int h2_avail_streams(struct connection *conn)
743{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100744 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100745 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100746 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100747
Willy Tarreau6afec462019-01-28 06:40:19 +0100748 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
749 * streams on the connection.
750 */
751 if (h2c->last_sid >= 0)
752 return 0;
753
Willy Tarreauc61966f2019-10-31 15:10:03 +0100754 if (h2c->st0 >= H2_CS_ERROR)
755 return 0;
756
Willy Tarreau86949782019-01-31 10:42:05 +0100757 /* note: may be negative if a SETTINGS frame changes the limit */
758 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100759
760 /* we must also consider the limit imposed by stream IDs */
761 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100762 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100763 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100764 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
765 ret1 = MIN(ret1, ret2);
766 }
767 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100768}
769
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200770
Willy Tarreau62f52692017-10-08 23:01:42 +0200771/*****************************************************************/
772/* functions below are dedicated to the mux setup and management */
773/*****************************************************************/
774
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200775/* Initialize the mux once it's attached. For outgoing connections, the context
776 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200777 * connections from the fact that the context is still NULL (even during mux
778 * upgrades). <input> is always used as Input buffer and may contain data. It is
779 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200780 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200781static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
782 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200783{
784 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100785 struct task *t = NULL;
Christopher Fauletf81ef032019-10-04 15:19:43 +0200786 void *conn_ctx = conn->ctx;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200787
Christopher Fauletf81ef032019-10-04 15:19:43 +0200788 TRACE_ENTER(H2_EV_H2C_NEW);
Willy Tarreau7838a792019-08-12 18:42:03 +0200789
Willy Tarreaubafbe012017-11-24 17:34:44 +0100790 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200791 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200792 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200793
Christopher Faulete9b70722019-04-08 10:46:02 +0200794 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200795 h2c->flags = H2_CF_IS_BACK;
796 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
797 if (tick_isset(prx->timeout.serverfin))
798 h2c->shut_timeout = prx->timeout.serverfin;
799 } else {
800 h2c->flags = H2_CF_NONE;
801 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
802 if (tick_isset(prx->timeout.clientfin))
803 h2c->shut_timeout = prx->timeout.clientfin;
804 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100805
Willy Tarreau0b37d652018-10-03 10:33:02 +0200806 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100807 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100808 if (tick_isset(h2c->timeout)) {
809 t = task_new(tid_bit);
810 if (!t)
811 goto fail;
812
813 h2c->task = t;
814 t->process = h2_timeout_task;
815 t->context = h2c;
816 t->expire = tick_add(now_ms, h2c->timeout);
817 }
Willy Tarreauea392822017-10-31 10:02:25 +0100818
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200819 h2c->wait_event.tasklet = tasklet_new();
820 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200821 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200822 h2c->wait_event.tasklet->process = h2_io_cb;
823 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100824 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200825
Willy Tarreau2bdcc702020-05-19 11:31:11 +0200826 h2c->ddht = hpack_dht_alloc();
Willy Tarreau32218eb2017-09-22 08:07:25 +0200827 if (!h2c->ddht)
828 goto fail;
829
830 /* Initialise the context. */
831 h2c->st0 = H2_CS_PREFACE;
832 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100833 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200834 h2c->max_id = -1;
835 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100836 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200837 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100838 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200839 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100840 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100841 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200842
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200843 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200844 h2c->dsi = -1;
845 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100846
Willy Tarreau32218eb2017-09-22 08:07:25 +0200847 h2c->last_sid = -1;
848
Willy Tarreau51330962019-05-26 09:38:07 +0200849 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200850 h2c->miw = 65535; /* mux initial window size */
851 h2c->mws = 65535; /* mux window size */
852 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200853 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200854 LIST_INIT(&h2c->send_list);
855 LIST_INIT(&h2c->fctl_list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +0200856 LIST_INIT(&h2c->blocked_list);
Willy Tarreau21046592020-02-26 10:39:36 +0100857 MT_LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200858
Christopher Fauletf81ef032019-10-04 15:19:43 +0200859 conn->ctx = h2c;
860
Willy Tarreau3f133572017-10-31 19:21:06 +0100861 if (t)
862 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100863
Willy Tarreau01b44822018-10-03 14:26:37 +0200864 if (h2c->flags & H2_CF_IS_BACK) {
865 /* FIXME: this is temporary, for outgoing connections we need
866 * to immediately allocate a stream until the code is modified
867 * so that the caller calls ->attach(). For now the outgoing cs
Christopher Fauletf81ef032019-10-04 15:19:43 +0200868 * is stored as conn->ctx by the caller and saved in conn_ctx.
Willy Tarreau01b44822018-10-03 14:26:37 +0200869 */
870 struct h2s *h2s;
871
Christopher Fauletf81ef032019-10-04 15:19:43 +0200872 h2s = h2c_bck_stream_new(h2c, conn_ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200873 if (!h2s)
874 goto fail_stream;
875 }
876
Willy Tarreau0f383582018-10-03 14:22:21 +0200877 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200878 h2c_restart_reading(h2c, 1);
Willy Tarreau7838a792019-08-12 18:42:03 +0200879 TRACE_LEAVE(H2_EV_H2C_NEW, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200880 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +0200881 fail_stream:
882 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +0200883 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +0200884 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200885 if (h2c->wait_event.tasklet)
886 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +0100887 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +0200888 fail_no_h2c:
Christopher Fauletf81ef032019-10-04 15:19:43 +0200889 conn->ctx = conn_ctx; /* restore saved ctx */
890 TRACE_DEVEL("leaving in error", H2_EV_H2C_NEW|H2_EV_H2C_END|H2_EV_H2C_ERR);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200891 return -1;
892}
893
Willy Tarreau751f2d02018-10-05 09:35:00 +0200894/* returns the next allocatable outgoing stream ID for the H2 connection, or
895 * -1 if no more is allocatable.
896 */
897static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
898{
899 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +0100900
901 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +0200902 id = -1;
903 return id;
904}
905
Willy Tarreau2373acc2017-10-12 17:35:14 +0200906/* returns the stream associated with id <id> or NULL if not found */
907static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
908{
909 struct eb32_node *node;
910
Willy Tarreau751f2d02018-10-05 09:35:00 +0200911 if (id == 0)
912 return (struct h2s *)h2_closed_stream;
913
Willy Tarreau2a856182017-05-16 15:20:39 +0200914 if (id > h2c->max_id)
915 return (struct h2s *)h2_idle_stream;
916
Willy Tarreau2373acc2017-10-12 17:35:14 +0200917 node = eb32_lookup(&h2c->streams_by_id, id);
918 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +0200919 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +0200920
921 return container_of(node, struct h2s, by_id);
922}
923
Christopher Faulet73c12072019-04-08 11:23:22 +0200924/* release function. This one should be called to free all resources allocated
925 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +0200926 */
Christopher Faulet73c12072019-04-08 11:23:22 +0200927static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +0200928{
William Dauchy477757c2020-08-07 22:19:23 +0200929 struct connection *conn = NULL;
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200930
Willy Tarreau7838a792019-08-12 18:42:03 +0200931 TRACE_ENTER(H2_EV_H2C_END);
932
Willy Tarreau32218eb2017-09-22 08:07:25 +0200933 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +0200934 /* The connection must be aattached to this mux to be released */
935 if (h2c->conn && h2c->conn->ctx == h2c)
936 conn = h2c->conn;
937
Willy Tarreau7838a792019-08-12 18:42:03 +0200938 TRACE_DEVEL("freeing h2c", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200939 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +0200940
Willy Tarreau21046592020-02-26 10:39:36 +0100941 if (MT_LIST_ADDED(&h2c->buf_wait.list))
942 MT_LIST_DEL(&h2c->buf_wait.list);
Willy Tarreau14398122017-09-22 14:26:04 +0200943
Willy Tarreau44e973f2018-03-01 17:49:30 +0100944 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200945 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100946
Willy Tarreauea392822017-10-31 10:02:25 +0100947 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +0200948 h2c->task->context = NULL;
949 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +0100950 h2c->task = NULL;
951 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200952 if (h2c->wait_event.tasklet)
953 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet21d849f2019-09-18 11:07:20 +0200954 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +0100955 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet21d849f2019-09-18 11:07:20 +0200956 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +0100957
Willy Tarreaubafbe012017-11-24 17:34:44 +0100958 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200959 }
960
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200961 if (conn) {
962 conn->mux = NULL;
963 conn->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +0200964 TRACE_DEVEL("freeing conn", H2_EV_H2C_END, conn);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200965
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200966 conn_stop_tracking(conn);
967 conn_full_close(conn);
968 if (conn->destroy_cb)
969 conn->destroy_cb(conn);
970 conn_free(conn);
971 }
Willy Tarreau7838a792019-08-12 18:42:03 +0200972
973 TRACE_LEAVE(H2_EV_H2C_END);
Willy Tarreau62f52692017-10-08 23:01:42 +0200974}
975
976
Willy Tarreau71681172017-10-23 14:39:06 +0200977/******************************************************/
978/* functions below are for the H2 protocol processing */
979/******************************************************/
980
981/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +0100982static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +0200983{
984 return h2s ? h2s->id : 0;
985}
986
Willy Tarreau1d4a0f82019-08-02 07:52:08 +0200987/* returns the sum of the stream's own window size and the mux's initial
988 * window, which together form the stream's effective window size.
989 */
990static inline int h2s_mws(const struct h2s *h2s)
991{
992 return h2s->sws + h2s->h2c->miw;
993}
994
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200995/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100996static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200997{
998 if (h2c->msi < 0)
999 return 0;
1000
1001 if (h2c->msi == h2s_id(h2s))
1002 return 0;
1003
1004 return 1;
1005}
1006
Willy Tarreau741d6df2017-10-17 08:00:59 +02001007/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +01001008static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +02001009{
Willy Tarreau022e5e52020-09-10 09:33:15 +02001010 TRACE_POINT(H2_EV_H2C_ERR, h2c->conn, 0, 0, (void *)(long)(err));
Willy Tarreau741d6df2017-10-17 08:00:59 +02001011 h2c->errcode = err;
1012 h2c->st0 = H2_CS_ERROR;
1013}
1014
Willy Tarreau175cebb2019-01-24 10:02:24 +01001015/* marks an error on the stream. It may also update an already closed stream
1016 * (e.g. to report an error after an RST was received).
1017 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001018static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +02001019{
Willy Tarreau175cebb2019-01-24 10:02:24 +01001020 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau022e5e52020-09-10 09:33:15 +02001021 TRACE_POINT(H2_EV_H2S_ERR, h2s->h2c->conn, h2s, 0, (void *)(long)(err));
Willy Tarreau2e43f082017-10-17 08:03:59 +02001022 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +01001023 if (h2s->st < H2_SS_ERROR)
1024 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +01001025 if (h2s->cs)
1026 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +02001027 }
1028}
1029
Willy Tarreau7e094452018-12-19 18:08:52 +01001030/* attempt to notify the data layer of recv availability */
1031static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
1032{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001033 if (h2s->subs && h2s->subs->events & SUB_RETRY_RECV) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001034 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001035 tasklet_wakeup(h2s->subs->tasklet);
1036 h2s->subs->events &= ~SUB_RETRY_RECV;
1037 if (!h2s->subs->events)
1038 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001039 }
1040}
1041
1042/* attempt to notify the data layer of send availability */
1043static void __maybe_unused h2s_notify_send(struct h2s *h2s)
1044{
Willy Tarreauf96508a2020-01-10 11:12:48 +01001045 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001046 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01001047 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01001048 tasklet_wakeup(h2s->subs->tasklet);
1049 h2s->subs->events &= ~SUB_RETRY_SEND;
1050 if (!h2s->subs->events)
1051 h2s->subs = NULL;
Willy Tarreau7e094452018-12-19 18:08:52 +01001052 }
Willy Tarreau5723f292020-01-10 15:16:57 +01001053 else if (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) {
1054 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
1055 tasklet_wakeup(h2s->shut_tl);
1056 }
Willy Tarreau7e094452018-12-19 18:08:52 +01001057}
1058
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001059/* alerts the data layer, trying to wake it up by all means, following
1060 * this sequence :
1061 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
1062 * - if its subscribed to send, then it's woken up for send
1063 * - if it was subscribed to neither, its ->wake() callback is called
1064 * It is safe to call this function with a closed stream which doesn't have a
1065 * conn_stream anymore.
1066 */
1067static void __maybe_unused h2s_alert(struct h2s *h2s)
1068{
Willy Tarreau7838a792019-08-12 18:42:03 +02001069 TRACE_ENTER(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
1070
Willy Tarreauf96508a2020-01-10 11:12:48 +01001071 if (h2s->subs ||
Willy Tarreau5723f292020-01-10 15:16:57 +01001072 (h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW))) {
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001073 h2s_notify_recv(h2s);
1074 h2s_notify_send(h2s);
1075 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001076 else if (h2s->cs && h2s->cs->data_cb->wake != NULL) {
1077 TRACE_POINT(H2_EV_STRM_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001078 h2s->cs->data_cb->wake(h2s->cs);
Willy Tarreau7838a792019-08-12 18:42:03 +02001079 }
1080
1081 TRACE_LEAVE(H2_EV_H2S_WAKE, h2s->h2c->conn, h2s);
Willy Tarreau8b2757c2018-12-19 17:36:48 +01001082}
1083
Willy Tarreaue4820742017-07-27 13:37:23 +02001084/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +01001085static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +02001086{
1087 uint8_t *out = frame;
1088
1089 *out = len >> 16;
1090 write_n16(out + 1, len);
1091}
1092
Willy Tarreau54c15062017-10-10 17:10:03 +02001093/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
1094 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
1095 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001096 * available in the buffer's input prior to calling this function. The buffer
1097 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +02001098 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001099static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +02001100 const struct buffer *b, int o)
1101{
Willy Tarreau591d4452018-06-15 17:21:00 +02001102 readv_bytes(dst, bytes, b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001103}
1104
Willy Tarreau1f094672017-11-20 21:27:45 +01001105static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001106{
Willy Tarreau591d4452018-06-15 17:21:00 +02001107 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001108}
1109
Willy Tarreau1f094672017-11-20 21:27:45 +01001110static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001111{
Willy Tarreau591d4452018-06-15 17:21:00 +02001112 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001113}
1114
Willy Tarreau1f094672017-11-20 21:27:45 +01001115static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +02001116{
Willy Tarreau591d4452018-06-15 17:21:00 +02001117 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +02001118}
1119
1120
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001121/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
1122 * The algorithm is not obvious. It turns out that H2 headers are neither
1123 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
1124 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +02001125 *
1126 * b0 b1 b2 b3 b4 b5..b8
1127 * +----------+---------+--------+----+----+----------------------+
1128 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
1129 * +----------+---------+--------+----+----+----------------------+
1130 *
1131 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
1132 * we get the sid properly aligned and ordered, and 16 bits of len properly
1133 * ordered as well. The type and flags can be extracted using bit shifts from
1134 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +02001135 * Returns zero if some bytes are missing, otherwise non-zero on success. The
1136 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +02001137 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001138static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001139{
1140 uint64_t w;
1141
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001142 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +02001143 return 0;
1144
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001145 w = h2_get_n64(b, o + 1);
1146 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +02001147 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
1148 h->ff = w >> 32;
1149 h->ft = w >> 40;
1150 h->len += w >> 48;
1151 return 1;
1152}
1153
1154/* skip the next 9 bytes corresponding to the frame header possibly parsed by
1155 * h2_peek_frame_hdr() above.
1156 */
Willy Tarreau1f094672017-11-20 21:27:45 +01001157static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +02001158{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +02001159 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +02001160}
1161
1162/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +01001163static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +02001164{
1165 int ret;
1166
Willy Tarreaua4428bd2018-12-22 18:11:41 +01001167 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +02001168 if (ret > 0)
1169 h2_skip_frame_hdr(b);
1170 return ret;
1171}
1172
Willy Tarreaucb985a42019-10-07 16:56:34 +02001173
1174/* try to fragment the headers frame present at the beginning of buffer <b>,
1175 * enforcing a limit of <mfs> bytes per frame. Returns 0 on failure, 1 on
1176 * success. Typical causes of failure include a buffer not large enough to
1177 * add extra frame headers. The existing frame size is read in the current
1178 * frame. Its EH flag will be cleared if CONTINUATION frames need to be added,
1179 * and its length will be adjusted. The stream ID for continuation frames will
1180 * be copied from the initial frame's.
1181 */
1182static int h2_fragment_headers(struct buffer *b, uint32_t mfs)
1183{
1184 size_t remain = b->data - 9;
1185 int extra_frames = (remain - 1) / mfs;
1186 size_t fsize;
1187 char *fptr;
1188 int frame;
1189
1190 if (b->data <= mfs + 9)
1191 return 1;
1192
1193 /* Too large a frame, we need to fragment it using CONTINUATION
1194 * frames. We start from the end and move tails as needed.
1195 */
1196 if (b->data + extra_frames * 9 > b->size)
1197 return 0;
1198
1199 for (frame = extra_frames; frame; frame--) {
1200 fsize = ((remain - 1) % mfs) + 1;
1201 remain -= fsize;
1202
1203 /* move data */
1204 fptr = b->area + 9 + remain + (frame - 1) * 9;
1205 memmove(fptr + 9, b->area + 9 + remain, fsize);
1206 b->data += 9;
1207
1208 /* write new frame header */
1209 h2_set_frame_size(fptr, fsize);
1210 fptr[3] = H2_FT_CONTINUATION;
1211 fptr[4] = (frame == extra_frames) ? H2_F_HEADERS_END_HEADERS : 0;
1212 write_n32(fptr + 5, read_n32(b->area + 5));
1213 }
1214
1215 b->area[4] &= ~H2_F_HEADERS_END_HEADERS;
1216 h2_set_frame_size(b->area, remain);
1217 return 1;
1218}
1219
1220
Willy Tarreau00dd0782018-03-01 16:31:34 +01001221/* marks stream <h2s> as CLOSED and decrement the number of active streams for
1222 * its connection if the stream was not yet closed. Please use this exclusively
1223 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001224 */
Willy Tarreau00dd0782018-03-01 16:31:34 +01001225static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001226{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001227 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau7838a792019-08-12 18:42:03 +02001228 TRACE_ENTER(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001229 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001230 if (!h2s->id)
1231 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +01001232 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +01001233 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
1234 h2s_notify_recv(h2s);
1235 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001236 TRACE_LEAVE(H2_EV_H2S_END, h2s->h2c->conn, h2s);
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001237 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +01001238 h2s->st = H2_SS_CLOSED;
1239}
1240
Willy Tarreau71049cc2018-03-28 13:56:39 +02001241/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001242/* h2s_destroy should only ever be called by the thread that owns the stream,
1243 * that means that a tasklet should be used if we want to destroy the h2s
1244 * from another thread
1245 */
Willy Tarreau71049cc2018-03-28 13:56:39 +02001246static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +01001247{
Willy Tarreau7838a792019-08-12 18:42:03 +02001248 struct connection *conn = h2s->h2c->conn;
1249
1250 TRACE_ENTER(H2_EV_H2S_END, conn, h2s);
1251
Willy Tarreau0a10de62018-03-01 16:27:53 +01001252 h2s_close(h2s);
1253 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +02001254 if (b_size(&h2s->rxbuf)) {
1255 b_free(&h2s->rxbuf);
1256 offer_buffers(NULL, tasks_run_queue);
1257 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001258
1259 if (h2s->subs)
1260 h2s->subs->events = 0;
1261
Joseph Herlantd77575d2018-11-25 10:54:45 -08001262 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001263 * reference left would be in the h2c send_list/fctl_list, and if
1264 * we're in it, we're getting out anyway
1265 */
Olivier Houchardd360ac62019-03-22 17:37:16 +01001266 LIST_DEL_INIT(&h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01001267
Olivier Houchard5a3671d2019-10-11 16:33:49 +02001268 /* ditto, calling tasklet_free() here should be ok */
Willy Tarreau5723f292020-01-10 15:16:57 +01001269 tasklet_free(h2s->shut_tl);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001270 pool_free(pool_head_h2s, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001271
1272 TRACE_LEAVE(H2_EV_H2S_END, conn);
Willy Tarreau0a10de62018-03-01 16:27:53 +01001273}
1274
Willy Tarreaua8e49542018-10-03 18:53:55 +02001275/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
1276 * stream tree. In case of error, nothing is added and NULL is returned. The
1277 * causes of errors can be any failed memory allocation. The caller is
1278 * responsible for checking if the connection may support an extra stream
1279 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001280 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02001281static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001282{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001283 struct h2s *h2s;
1284
Willy Tarreau7838a792019-08-12 18:42:03 +02001285 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1286
Willy Tarreaubafbe012017-11-24 17:34:44 +01001287 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001288 if (!h2s)
1289 goto out;
1290
Willy Tarreau5723f292020-01-10 15:16:57 +01001291 h2s->shut_tl = tasklet_new();
1292 if (!h2s->shut_tl) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001293 pool_free(pool_head_h2s, h2s);
1294 goto out;
1295 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01001296 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01001297 h2s->shut_tl->process = h2_deferred_shut;
1298 h2s->shut_tl->context = h2s;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02001299 LIST_INIT(&h2s->list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001300 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001301 h2s->cs = NULL;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001302 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001303 h2s->flags = H2_SF_NONE;
1304 h2s->errcode = H2_ERR_NO_ERROR;
1305 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02001306 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +01001307 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +02001308 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001309
1310 if (h2c->flags & H2_CF_IS_BACK) {
1311 h1m_init_req(&h2s->h1m);
1312 h2s->h1m.err_pos = -1; // don't care about errors on the request path
1313 h2s->h1m.flags |= H1_MF_TOLOWER;
1314 } else {
1315 h1m_init_res(&h2s->h1m);
1316 h2s->h1m.err_pos = -1; // don't care about errors on the response path
1317 h2s->h1m.flags |= H1_MF_TOLOWER;
1318 }
1319
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001320 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001321 if (id > 0)
1322 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01001323 else
1324 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001325
1326 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +01001327 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +01001328 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001329
Willy Tarreau7838a792019-08-12 18:42:03 +02001330 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001331 return h2s;
Willy Tarreaua8e49542018-10-03 18:53:55 +02001332 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001333 TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreaua8e49542018-10-03 18:53:55 +02001334 return NULL;
1335}
1336
1337/* creates a new stream <id> on the h2c connection and returns it, or NULL in
1338 * case of memory allocation error.
1339 */
1340static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
1341{
1342 struct session *sess = h2c->conn->owner;
1343 struct conn_stream *cs;
1344 struct h2s *h2s;
1345
Willy Tarreau7838a792019-08-12 18:42:03 +02001346 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1347
Willy Tarreaua8e49542018-10-03 18:53:55 +02001348 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1349 goto out;
1350
1351 h2s = h2s_new(h2c, id);
1352 if (!h2s)
1353 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001354
Christopher Faulet236c93b2020-07-02 09:19:54 +02001355 cs = cs_new(h2c->conn, h2c->conn->target);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001356 if (!cs)
1357 goto out_close;
1358
Olivier Houchard746fb772018-12-15 19:42:00 +01001359 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001360 h2s->cs = cs;
1361 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001362 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001363
1364 if (stream_create_from_cs(cs) < 0)
1365 goto out_free_cs;
1366
Willy Tarreau590a0512018-09-05 11:56:48 +02001367 /* We want the accept date presented to the next stream to be the one
1368 * we have now, the handshake time to be null (since the next stream
1369 * is not delayed by a handshake), and the idle time to count since
1370 * right now.
1371 */
1372 sess->accept_date = date;
1373 sess->tv_accept = now;
1374 sess->t_handshake = 0;
1375
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001376 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001377 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001378 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001379 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001380 return h2s;
1381
1382 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001383 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001384 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001385 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001386 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001387 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001388 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001389 sess_log(sess);
Willy Tarreau7838a792019-08-12 18:42:03 +02001390 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
Willy Tarreau45efc072018-10-03 18:27:52 +02001391 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001392}
1393
Willy Tarreau751f2d02018-10-05 09:35:00 +02001394/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1395 * and returns it, or NULL in case of memory allocation error or if the highest
1396 * possible stream ID was reached.
1397 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001398static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001399{
1400 struct h2s *h2s = NULL;
1401
Willy Tarreau7838a792019-08-12 18:42:03 +02001402 TRACE_ENTER(H2_EV_H2S_NEW, h2c->conn);
1403
Willy Tarreau86949782019-01-31 10:42:05 +01001404 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001405 goto out;
1406
Willy Tarreaua80dca82019-01-24 17:08:28 +01001407 if (h2_streams_left(h2c) < 1)
1408 goto out;
1409
Willy Tarreau751f2d02018-10-05 09:35:00 +02001410 /* Defer choosing the ID until we send the first message to create the stream */
1411 h2s = h2s_new(h2c, 0);
1412 if (!h2s)
1413 goto out;
1414
1415 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001416 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001417 cs->ctx = h2s;
1418 h2c->nb_cs++;
1419
Willy Tarreau751f2d02018-10-05 09:35:00 +02001420 out:
Willy Tarreau7838a792019-08-12 18:42:03 +02001421 if (likely(h2s))
1422 TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
1423 else
1424 TRACE_LEAVE(H2_EV_H2S_NEW|H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn, h2s);
Willy Tarreau751f2d02018-10-05 09:35:00 +02001425 return h2s;
1426}
1427
Willy Tarreaube5b7152017-09-25 16:25:39 +02001428/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1429 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1430 * the various settings codes.
1431 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001432static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001433{
1434 struct buffer *res;
1435 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001436 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001437 int mfs;
Willy Tarreau7838a792019-08-12 18:42:03 +02001438 int ret = 0;
1439
1440 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001441
1442 if (h2c_mux_busy(h2c, NULL)) {
1443 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001444 goto out;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001445 }
1446
Willy Tarreaube5b7152017-09-25 16:25:39 +02001447 chunk_init(&buf, buf_data, sizeof(buf_data));
1448 chunk_memcpy(&buf,
1449 "\x00\x00\x00" /* length : 0 for now */
1450 "\x04\x00" /* type : 4 (settings), flags : 0 */
1451 "\x00\x00\x00\x00", /* stream ID : 0 */
1452 9);
1453
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001454 if (h2c->flags & H2_CF_IS_BACK) {
1455 /* send settings_enable_push=0 */
1456 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1457 }
1458
Willy Tarreaube5b7152017-09-25 16:25:39 +02001459 if (h2_settings_header_table_size != 4096) {
1460 char str[6] = "\x00\x01"; /* header_table_size */
1461
1462 write_n32(str + 2, h2_settings_header_table_size);
1463 chunk_memcat(&buf, str, 6);
1464 }
1465
1466 if (h2_settings_initial_window_size != 65535) {
1467 char str[6] = "\x00\x04"; /* initial_window_size */
1468
1469 write_n32(str + 2, h2_settings_initial_window_size);
1470 chunk_memcat(&buf, str, 6);
1471 }
1472
1473 if (h2_settings_max_concurrent_streams != 0) {
1474 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1475
1476 /* Note: 0 means "unlimited" for haproxy's config but not for
1477 * the protocol, so never send this value!
1478 */
1479 write_n32(str + 2, h2_settings_max_concurrent_streams);
1480 chunk_memcat(&buf, str, 6);
1481 }
1482
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001483 mfs = h2_settings_max_frame_size;
1484 if (mfs > global.tune.bufsize)
1485 mfs = global.tune.bufsize;
1486
1487 if (!mfs)
1488 mfs = global.tune.bufsize;
1489
1490 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001491 char str[6] = "\x00\x05"; /* max_frame_size */
1492
1493 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1494 * match bufsize - rewrite size, but at the moment it seems
1495 * that clients don't take care of it.
1496 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001497 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001498 chunk_memcat(&buf, str, 6);
1499 }
1500
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001501 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001502
1503 res = br_tail(h2c->mbuf);
1504 retry:
1505 if (!h2_get_buf(h2c, res)) {
1506 h2c->flags |= H2_CF_MUX_MALLOC;
1507 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001508 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001509 }
1510
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001511 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001512 if (unlikely(ret <= 0)) {
1513 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001514 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1515 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001516 h2c->flags |= H2_CF_MUX_MFULL;
1517 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001518 }
1519 else {
1520 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001521 ret = 0;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001522 }
1523 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001524 out:
1525 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001526 return ret;
1527}
1528
Willy Tarreau52eed752017-09-22 15:05:09 +02001529/* Try to receive a connection preface, then upon success try to send our
1530 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1531 * missing data. It may return an error in h2c.
1532 */
1533static int h2c_frt_recv_preface(struct h2c *h2c)
1534{
1535 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001536 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001537
Willy Tarreau7838a792019-08-12 18:42:03 +02001538 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
1539
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001540 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001541
1542 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001543 if (ret1 < 0)
1544 sess_log(h2c->conn->owner);
1545
Willy Tarreau52eed752017-09-22 15:05:09 +02001546 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn))
1547 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001548 ret2 = 0;
1549 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02001550 }
1551
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001552 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001553 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001554 b_del(&h2c->dbuf, ret1);
Willy Tarreau7838a792019-08-12 18:42:03 +02001555 out:
1556 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001557 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001558}
1559
Willy Tarreau01b44822018-10-03 14:26:37 +02001560/* Try to send a connection preface, then upon success try to send our
1561 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1562 * missing data. It may return an error in h2c.
1563 */
1564static int h2c_bck_send_preface(struct h2c *h2c)
1565{
1566 struct buffer *res;
Willy Tarreau7838a792019-08-12 18:42:03 +02001567 int ret = 0;
1568
1569 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02001570
1571 if (h2c_mux_busy(h2c, NULL)) {
1572 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001573 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001574 }
1575
Willy Tarreaubcc45952019-05-26 10:05:50 +02001576 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001577 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001578 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001579 h2c->flags |= H2_CF_MUX_MALLOC;
1580 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001581 goto out;
Willy Tarreau01b44822018-10-03 14:26:37 +02001582 }
1583
1584 if (!b_data(res)) {
1585 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001586 ret = b_istput(res, ist(H2_CONN_PREFACE));
1587 if (unlikely(ret <= 0)) {
1588 if (!ret) {
1589 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1590 goto retry;
1591 h2c->flags |= H2_CF_MUX_MFULL;
1592 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001593 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001594 }
1595 else {
1596 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001597 ret = 0;
1598 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001599 }
1600 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001601 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001602 ret = h2c_send_settings(h2c);
1603 out:
1604 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PREFACE, h2c->conn);
1605 return ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001606}
1607
Willy Tarreau081d4722017-05-16 21:51:05 +02001608/* try to send a GOAWAY frame on the connection to report an error or a graceful
1609 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1610 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1611 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1612 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1613 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1614 * on unrecoverable failure. It will not attempt to send one again in this last
1615 * case so that it is safe to use h2c_error() to report such errors.
1616 */
1617static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1618{
1619 struct buffer *res;
1620 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02001621 int ret = 0;
Willy Tarreau081d4722017-05-16 21:51:05 +02001622
Willy Tarreau7838a792019-08-12 18:42:03 +02001623 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
1624
1625 if (h2c->flags & H2_CF_GOAWAY_FAILED) {
1626 ret = 1; // claim that it worked
1627 goto out;
1628 }
Willy Tarreau081d4722017-05-16 21:51:05 +02001629
1630 if (h2c_mux_busy(h2c, h2s)) {
1631 if (h2s)
1632 h2s->flags |= H2_SF_BLK_MBUSY;
1633 else
1634 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001635 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001636 }
1637
Willy Tarreau9c218e72019-05-26 10:08:28 +02001638 /* len: 8, type: 7, flags: none, sid: 0 */
1639 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1640
1641 if (h2c->last_sid < 0)
1642 h2c->last_sid = h2c->max_id;
1643
1644 write_n32(str + 9, h2c->last_sid);
1645 write_n32(str + 13, h2c->errcode);
1646
Willy Tarreaubcc45952019-05-26 10:05:50 +02001647 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001648 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001649 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001650 h2c->flags |= H2_CF_MUX_MALLOC;
1651 if (h2s)
1652 h2s->flags |= H2_SF_BLK_MROOM;
1653 else
1654 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001655 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001656 }
1657
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001658 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001659 if (unlikely(ret <= 0)) {
1660 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001661 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1662 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001663 h2c->flags |= H2_CF_MUX_MFULL;
1664 if (h2s)
1665 h2s->flags |= H2_SF_BLK_MROOM;
1666 else
1667 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001668 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001669 }
1670 else {
1671 /* we cannot report this error using GOAWAY, so we mark
1672 * it and claim a success.
1673 */
1674 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1675 h2c->flags |= H2_CF_GOAWAY_FAILED;
Willy Tarreau7838a792019-08-12 18:42:03 +02001676 ret = 1;
1677 goto out;
Willy Tarreau081d4722017-05-16 21:51:05 +02001678 }
1679 }
1680 h2c->flags |= H2_CF_GOAWAY_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02001681 out:
1682 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_GOAWAY, h2c->conn);
Willy Tarreau081d4722017-05-16 21:51:05 +02001683 return ret;
1684}
1685
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001686/* Try to send an RST_STREAM frame on the connection for the indicated stream
1687 * during mux operations. This stream must be valid and cannot be closed
1688 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1689 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1690 * not yet.
1691 *
1692 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1693 * to write the message, it subscribes the stream to future notifications.
1694 */
1695static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1696{
1697 struct buffer *res;
1698 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001699 int ret = 0;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001700
Willy Tarreau7838a792019-08-12 18:42:03 +02001701 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
1702
1703 if (!h2s || h2s->st == H2_SS_CLOSED) {
1704 ret = 1;
1705 goto out;
1706 }
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001707
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001708 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1709 * RST_STREAM in response to a RST_STREAM frame.
1710 */
Willy Tarreau231f6162019-08-06 10:01:40 +02001711 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001712 ret = 1;
1713 goto ignore;
1714 }
1715
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001716 if (h2c_mux_busy(h2c, h2s)) {
1717 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001718 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001719 }
1720
Willy Tarreau9c218e72019-05-26 10:08:28 +02001721 /* len: 4, type: 3, flags: none */
1722 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1723 write_n32(str + 5, h2s->id);
1724 write_n32(str + 9, h2s->errcode);
1725
Willy Tarreaubcc45952019-05-26 10:05:50 +02001726 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001727 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001728 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001729 h2c->flags |= H2_CF_MUX_MALLOC;
1730 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001731 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001732 }
1733
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001734 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001735 if (unlikely(ret <= 0)) {
1736 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001737 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1738 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001739 h2c->flags |= H2_CF_MUX_MFULL;
1740 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001741 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001742 }
1743 else {
1744 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001745 ret = 0;
1746 goto out;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001747 }
1748 }
1749
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001750 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001751 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001752 h2s_close(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001753 out:
1754 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001755 return ret;
1756}
1757
1758/* Try to send an RST_STREAM frame on the connection for the stream being
1759 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001760 * error code, even if the stream is one of the dummy ones, and will update
1761 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001762 *
1763 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1764 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001765 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001766 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001767 */
1768static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1769{
1770 struct buffer *res;
1771 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02001772 int ret = 0;
1773
1774 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001775
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001776 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1777 * RST_STREAM in response to a RST_STREAM frame.
1778 */
1779 if (h2c->dft == H2_FT_RST_STREAM) {
1780 ret = 1;
1781 goto ignore;
1782 }
1783
Willy Tarreau27a84c92017-10-17 08:10:17 +02001784 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001785 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001786 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001787 }
1788
Willy Tarreau9c218e72019-05-26 10:08:28 +02001789 /* len: 4, type: 3, flags: none */
1790 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1791
1792 write_n32(str + 5, h2c->dsi);
1793 write_n32(str + 9, h2s->errcode);
1794
Willy Tarreaubcc45952019-05-26 10:05:50 +02001795 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001796 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001797 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001798 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001799 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001800 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001801 }
1802
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001803 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001804 if (unlikely(ret <= 0)) {
1805 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001806 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1807 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001808 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001809 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001810 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001811 }
1812 else {
1813 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001814 ret = 0;
1815 goto out;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001816 }
1817 }
1818
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001819 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001820 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001821 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001822 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001823 }
1824
Willy Tarreau7838a792019-08-12 18:42:03 +02001825 out:
1826 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_RST, h2c->conn, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02001827 return ret;
1828}
1829
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001830/* try to send an empty DATA frame with the ES flag set to notify about the
1831 * end of stream and match a shutdown(write). If an ES was already sent as
1832 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1833 * on success or zero if nothing was done. In case of lack of room to write the
1834 * message, it subscribes the requesting stream to future notifications.
1835 */
1836static int h2_send_empty_data_es(struct h2s *h2s)
1837{
1838 struct h2c *h2c = h2s->h2c;
1839 struct buffer *res;
1840 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02001841 int ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001842
Willy Tarreau7838a792019-08-12 18:42:03 +02001843 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
1844
1845 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED) {
1846 ret = 1;
1847 goto out;
1848 }
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001849
1850 if (h2c_mux_busy(h2c, h2s)) {
1851 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02001852 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001853 }
1854
Willy Tarreau9c218e72019-05-26 10:08:28 +02001855 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1856 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1857 write_n32(str + 5, h2s->id);
1858
Willy Tarreaubcc45952019-05-26 10:05:50 +02001859 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001860 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001861 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001862 h2c->flags |= H2_CF_MUX_MALLOC;
1863 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02001864 goto out;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001865 }
1866
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001867 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001868 if (likely(ret > 0)) {
1869 h2s->flags |= H2_SF_ES_SENT;
1870 }
1871 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001872 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1873 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001874 h2c->flags |= H2_CF_MUX_MFULL;
1875 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001876 }
1877 else {
1878 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02001879 ret = 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001880 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001881 out:
1882 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA|H2_EV_TX_EOI, h2c->conn, h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001883 return ret;
1884}
1885
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05001886/* wake a specific stream and assign its conn_stream some CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02001887 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001888 * is automatically updated accordingly. If the stream is orphaned, it is
1889 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01001890 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001891static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01001892{
Willy Tarreau7838a792019-08-12 18:42:03 +02001893 struct h2c *h2c = h2s->h2c;
1894
1895 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn, h2s);
1896
Christopher Fauletf02ca002019-03-07 16:21:34 +01001897 if (!h2s->cs) {
1898 /* this stream was already orphaned */
1899 h2s_destroy(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001900 TRACE_DEVEL("leaving with no h2s", H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001901 return;
1902 }
1903
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001904 if (conn_xprt_read0_pending(h2s->h2c->conn)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001905 if (h2s->st == H2_SS_OPEN)
1906 h2s->st = H2_SS_HREM;
1907 else if (h2s->st == H2_SS_HLOC)
1908 h2s_close(h2s);
1909 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001910
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001911 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
1912 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
1913 h2s->cs->flags |= CS_FL_ERR_PENDING;
1914 if (h2s->cs->flags & CS_FL_EOS)
1915 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02001916
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001917 if (h2s->st < H2_SS_ERROR)
1918 h2s->st = H2_SS_ERROR;
1919 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01001920
1921 h2s_alert(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02001922 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001923}
1924
1925/* wake the streams attached to the connection, whose id is greater than <last>
1926 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001927 */
Willy Tarreau23482912019-05-07 15:23:14 +02001928static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001929{
1930 struct eb32_node *node;
1931 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001932
Willy Tarreau7838a792019-08-12 18:42:03 +02001933 TRACE_ENTER(H2_EV_H2S_WAKE, h2c->conn);
1934
Christopher Fauletf02ca002019-03-07 16:21:34 +01001935 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001936 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
1937 while (node) {
1938 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001939 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001940 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001941 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01001942
Christopher Fauletf02ca002019-03-07 16:21:34 +01001943 /* Wake all streams with unassigned ID (ID == 0) */
1944 node = eb32_lookup(&h2c->streams_by_id, 0);
1945 while (node) {
1946 h2s = container_of(node, struct h2s, by_id);
1947 if (h2s->id > 0)
1948 break;
1949 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001950 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001951 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001952
1953 TRACE_LEAVE(H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001954}
1955
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001956/* Wake up all blocked streams whose window size has become positive after the
1957 * mux's initial window was adjusted. This should be done after having processed
1958 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001959 */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001960static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001961{
1962 struct h2s *h2s;
1963 struct eb32_node *node;
1964
Willy Tarreau7838a792019-08-12 18:42:03 +02001965 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
1966
Willy Tarreau3421aba2017-07-27 15:41:03 +02001967 node = eb32_first(&h2c->streams_by_id);
1968 while (node) {
1969 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02001970 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001971 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02001972 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01001973 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
1974 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001975 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001976 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001977 node = eb32_next(node);
1978 }
Willy Tarreau7838a792019-08-12 18:42:03 +02001979
1980 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001981}
1982
1983/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
1984 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01001985 * return an error in h2c. The caller must have already verified frame length
1986 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001987 */
1988static int h2c_handle_settings(struct h2c *h2c)
1989{
1990 unsigned int offset;
1991 int error;
1992
Willy Tarreau7838a792019-08-12 18:42:03 +02001993 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
1994
Willy Tarreau3421aba2017-07-27 15:41:03 +02001995 if (h2c->dff & H2_F_SETTINGS_ACK) {
1996 if (h2c->dfl) {
1997 error = H2_ERR_FRAME_SIZE_ERROR;
1998 goto fail;
1999 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002000 goto done;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002001 }
2002
Willy Tarreau3421aba2017-07-27 15:41:03 +02002003 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002004 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002005 goto out0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002006
2007 /* parse the frame */
2008 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002009 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
2010 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002011
2012 switch (type) {
2013 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
2014 /* we need to update all existing streams with the
2015 * difference from the previous iws.
2016 */
2017 if (arg < 0) { // RFC7540#6.5.2
2018 error = H2_ERR_FLOW_CONTROL_ERROR;
2019 goto fail;
2020 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02002021 h2c->miw = arg;
2022 break;
2023 case H2_SETTINGS_MAX_FRAME_SIZE:
2024 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
2025 error = H2_ERR_PROTOCOL_ERROR;
2026 goto fail;
2027 }
2028 h2c->mfs = arg;
2029 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01002030 case H2_SETTINGS_ENABLE_PUSH:
2031 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
2032 error = H2_ERR_PROTOCOL_ERROR;
2033 goto fail;
2034 }
2035 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01002036 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
2037 if (h2c->flags & H2_CF_IS_BACK) {
2038 /* the limit is only for the backend; for the frontend it is our limit */
2039 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
2040 arg = h2_settings_max_concurrent_streams;
2041 h2c->streams_limit = arg;
2042 }
2043 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002044 }
2045 }
2046
2047 /* need to ACK this frame now */
2048 h2c->st0 = H2_CS_FRAME_A;
Willy Tarreau7838a792019-08-12 18:42:03 +02002049 done:
2050 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002051 return 1;
2052 fail:
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002053 if (!(h2c->flags & H2_CF_IS_BACK))
2054 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002055 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002056 out0:
2057 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 +02002058 return 0;
2059}
2060
2061/* try to send an ACK for a settings frame on the connection. Returns > 0 on
2062 * success or one of the h2_status values.
2063 */
2064static int h2c_ack_settings(struct h2c *h2c)
2065{
2066 struct buffer *res;
2067 char str[9];
Willy Tarreau7838a792019-08-12 18:42:03 +02002068 int ret = 0;
2069
2070 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002071
2072 if (h2c_mux_busy(h2c, NULL)) {
2073 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002074 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002075 }
2076
Willy Tarreau9c218e72019-05-26 10:08:28 +02002077 memcpy(str,
2078 "\x00\x00\x00" /* length : 0 (no data) */
2079 "\x04" "\x01" /* type : 4, flags : ACK */
2080 "\x00\x00\x00\x00" /* stream ID */, 9);
2081
Willy Tarreaubcc45952019-05-26 10:05:50 +02002082 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002083 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002084 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002085 h2c->flags |= H2_CF_MUX_MALLOC;
2086 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002087 goto out;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002088 }
2089
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002090 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02002091 if (unlikely(ret <= 0)) {
2092 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002093 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2094 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002095 h2c->flags |= H2_CF_MUX_MFULL;
2096 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002097 }
2098 else {
2099 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002100 ret = 0;
Willy Tarreau3421aba2017-07-27 15:41:03 +02002101 }
2102 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002103 out:
2104 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_SETTINGS, h2c->conn);
Willy Tarreau3421aba2017-07-27 15:41:03 +02002105 return ret;
2106}
2107
Willy Tarreaucf68c782017-10-10 17:11:41 +02002108/* processes a PING frame and schedules an ACK if needed. The caller must pass
2109 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01002110 * missing data. The caller must have already verified frame length
2111 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02002112 */
2113static int h2c_handle_ping(struct h2c *h2c)
2114{
Willy Tarreaucf68c782017-10-10 17:11:41 +02002115 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01002116 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02002117 h2c->st0 = H2_CS_FRAME_A;
2118 return 1;
2119}
2120
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002121/* Try to send a window update for stream id <sid> and value <increment>.
2122 * Returns > 0 on success or zero on missing room or failure. It may return an
2123 * error in h2c.
2124 */
2125static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
2126{
2127 struct buffer *res;
2128 char str[13];
Willy Tarreau7838a792019-08-12 18:42:03 +02002129 int ret = 0;
2130
2131 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002132
2133 if (h2c_mux_busy(h2c, NULL)) {
2134 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002135 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002136 }
2137
Willy Tarreau9c218e72019-05-26 10:08:28 +02002138 /* length: 4, type: 8, flags: none */
2139 memcpy(str, "\x00\x00\x04\x08\x00", 5);
2140 write_n32(str + 5, sid);
2141 write_n32(str + 9, increment);
2142
Willy Tarreaubcc45952019-05-26 10:05:50 +02002143 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02002144 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02002145 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002146 h2c->flags |= H2_CF_MUX_MALLOC;
2147 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002148 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002149 }
2150
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002151 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002152 if (unlikely(ret <= 0)) {
2153 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002154 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2155 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002156 h2c->flags |= H2_CF_MUX_MFULL;
2157 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002158 }
2159 else {
2160 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002161 ret = 0;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002162 }
2163 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002164 out:
2165 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002166 return ret;
2167}
2168
2169/* try to send pending window update for the connection. It's safe to call it
2170 * with no pending updates. Returns > 0 on success or zero on missing room or
2171 * failure. It may return an error in h2c.
2172 */
2173static int h2c_send_conn_wu(struct h2c *h2c)
2174{
2175 int ret = 1;
2176
Willy Tarreau7838a792019-08-12 18:42:03 +02002177 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2178
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002179 if (h2c->rcvd_c <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002180 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002181
Willy Tarreau97aaa672018-12-23 09:49:04 +01002182 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
2183 /* increase the advertised connection window to 2G on
2184 * first update.
2185 */
2186 h2c->flags |= H2_CF_WINDOW_OPENED;
2187 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
2188 }
2189
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002190 /* send WU for the connection */
2191 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
2192 if (ret > 0)
2193 h2c->rcvd_c = 0;
2194
Willy Tarreau7838a792019-08-12 18:42:03 +02002195 out:
2196 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002197 return ret;
2198}
2199
2200/* try to send pending window update for the current dmux stream. It's safe to
2201 * call it with no pending updates. Returns > 0 on success or zero on missing
2202 * room or failure. It may return an error in h2c.
2203 */
2204static int h2c_send_strm_wu(struct h2c *h2c)
2205{
2206 int ret = 1;
2207
Willy Tarreau7838a792019-08-12 18:42:03 +02002208 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
2209
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002210 if (h2c->rcvd_s <= 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002211 goto out;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002212
2213 /* send WU for the stream */
2214 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
2215 if (ret > 0)
2216 h2c->rcvd_s = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002217 out:
2218 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002219 return ret;
2220}
2221
Willy Tarreaucf68c782017-10-10 17:11:41 +02002222/* try to send an ACK for a ping frame on the connection. Returns > 0 on
2223 * success, 0 on missing data or one of the h2_status values.
2224 */
2225static int h2c_ack_ping(struct h2c *h2c)
2226{
2227 struct buffer *res;
2228 char str[17];
Willy Tarreau7838a792019-08-12 18:42:03 +02002229 int ret = 0;
2230
2231 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002232
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002233 if (b_data(&h2c->dbuf) < 8)
Willy Tarreau7838a792019-08-12 18:42:03 +02002234 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002235
2236 if (h2c_mux_busy(h2c, NULL)) {
2237 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02002238 goto out;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002239 }
2240
Willy Tarreaucf68c782017-10-10 17:11:41 +02002241 memcpy(str,
2242 "\x00\x00\x08" /* length : 8 (same payload) */
2243 "\x06" "\x01" /* type : 6, flags : ACK */
2244 "\x00\x00\x00\x00" /* stream ID */, 9);
2245
2246 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002247 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002248
Willy Tarreau9c218e72019-05-26 10:08:28 +02002249 res = br_tail(h2c->mbuf);
2250 retry:
2251 if (!h2_get_buf(h2c, res)) {
2252 h2c->flags |= H2_CF_MUX_MALLOC;
2253 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02002254 goto out;
Willy Tarreau9c218e72019-05-26 10:08:28 +02002255 }
2256
Willy Tarreauea1b06d2018-07-12 09:02:47 +02002257 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02002258 if (unlikely(ret <= 0)) {
2259 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02002260 if ((res = br_tail_add(h2c->mbuf)) != NULL)
2261 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002262 h2c->flags |= H2_CF_MUX_MFULL;
2263 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002264 }
2265 else {
2266 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002267 ret = 0;
Willy Tarreaucf68c782017-10-10 17:11:41 +02002268 }
2269 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002270 out:
2271 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_PING, h2c->conn);
Willy Tarreaucf68c782017-10-10 17:11:41 +02002272 return ret;
2273}
2274
Willy Tarreau26f95952017-07-27 17:18:30 +02002275/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
2276 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01002277 * h2c or h2s. The caller must have already verified frame length and stream ID
2278 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02002279 */
2280static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
2281{
2282 int32_t inc;
2283 int error;
2284
Willy Tarreau7838a792019-08-12 18:42:03 +02002285 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
2286
Willy Tarreau26f95952017-07-27 17:18:30 +02002287 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002288 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002289 goto out0;
Willy Tarreau26f95952017-07-27 17:18:30 +02002290
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002291 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02002292
2293 if (h2c->dsi != 0) {
2294 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02002295
2296 /* it's not an error to receive WU on a closed stream */
2297 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau7838a792019-08-12 18:42:03 +02002298 goto done;
Willy Tarreau26f95952017-07-27 17:18:30 +02002299
2300 if (!inc) {
2301 error = H2_ERR_PROTOCOL_ERROR;
2302 goto strm_err;
2303 }
2304
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002305 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002306 error = H2_ERR_FLOW_CONTROL_ERROR;
2307 goto strm_err;
2308 }
2309
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002310 h2s->sws += inc;
2311 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02002312 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreau9edf6db2019-10-02 10:49:59 +02002313 LIST_DEL_INIT(&h2s->list);
Willy Tarreauf96508a2020-01-10 11:12:48 +01002314 if ((h2s->subs && h2s->subs->events & SUB_RETRY_SEND) ||
2315 h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))
Olivier Houcharddddfe312018-10-10 18:51:00 +02002316 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02002317 }
2318 }
2319 else {
2320 /* connection window update */
2321 if (!inc) {
2322 error = H2_ERR_PROTOCOL_ERROR;
2323 goto conn_err;
2324 }
2325
2326 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
2327 error = H2_ERR_FLOW_CONTROL_ERROR;
2328 goto conn_err;
2329 }
2330
2331 h2c->mws += inc;
2332 }
2333
Willy Tarreau7838a792019-08-12 18:42:03 +02002334 done:
2335 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002336 return 1;
2337
2338 conn_err:
2339 h2c_error(h2c, error);
Willy Tarreau7838a792019-08-12 18:42:03 +02002340 out0:
2341 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 +02002342 return 0;
2343
2344 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002345 h2s_error(h2s, error);
2346 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002347 TRACE_DEVEL("leaving on stream error", H2_EV_RX_FRAME|H2_EV_RX_WU, h2c->conn);
Willy Tarreau26f95952017-07-27 17:18:30 +02002348 return 0;
2349}
2350
Willy Tarreaue96b0922017-10-30 00:28:29 +01002351/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01002352 * the last ID. Returns > 0 on success or zero on missing data. The caller must
2353 * have already verified frame length and stream ID validity. Described in
2354 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01002355 */
2356static int h2c_handle_goaway(struct h2c *h2c)
2357{
Willy Tarreaue96b0922017-10-30 00:28:29 +01002358 int last;
2359
Willy Tarreau7838a792019-08-12 18:42:03 +02002360 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002361 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002362 if (b_data(&h2c->dbuf) < h2c->dfl) {
2363 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002364 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002365 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01002366
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002367 last = h2_get_n32(&h2c->dbuf, 0);
2368 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01002369 if (h2c->last_sid < 0)
2370 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02002371 h2_wake_some_streams(h2c, last);
Willy Tarreau7838a792019-08-12 18:42:03 +02002372 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn);
Willy Tarreaue96b0922017-10-30 00:28:29 +01002373 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01002374}
2375
Willy Tarreau92153fc2017-12-03 19:46:19 +01002376/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01002377 * invalid. Returns > 0 on success or zero on missing data. It may return an
2378 * error in h2c. The caller must have already verified frame length and stream
2379 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01002380 */
2381static int h2c_handle_priority(struct h2c *h2c)
2382{
Willy Tarreau7838a792019-08-12 18:42:03 +02002383 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
2384
Willy Tarreau92153fc2017-12-03 19:46:19 +01002385 /* process full frame only */
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002386 if (b_data(&h2c->dbuf) < h2c->dfl) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002387 TRACE_DEVEL("leaving on missing data", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002388 return 0;
Willy Tarreaue7bbbca2019-08-30 15:02:22 +02002389 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01002390
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002391 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01002392 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01002393 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau7838a792019-08-12 18:42:03 +02002394 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreaub860c732019-01-30 15:39:55 +01002395 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002396 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002397 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn);
Willy Tarreau92153fc2017-12-03 19:46:19 +01002398 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01002399}
2400
Willy Tarreaucd234e92017-08-18 10:59:39 +02002401/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01002402 * Returns > 0 on success or zero on missing data. The caller must have already
2403 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02002404 */
2405static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
2406{
Willy Tarreau7838a792019-08-12 18:42:03 +02002407 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
2408
Willy Tarreaucd234e92017-08-18 10:59:39 +02002409 /* process full frame only */
Willy Tarreau7838a792019-08-12 18:42:03 +02002410 if (b_data(&h2c->dbuf) < h2c->dfl) {
2411 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 +02002412 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02002413 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002414
2415 /* late RST, already handled */
Willy Tarreau7838a792019-08-12 18:42:03 +02002416 if (h2s->st == H2_SS_CLOSED) {
2417 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 +02002418 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002419 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02002420
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002421 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01002422 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002423
2424 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01002425 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01002426 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002427 }
2428
2429 h2s->flags |= H2_SF_RST_RCVD;
Willy Tarreau7838a792019-08-12 18:42:03 +02002430 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_RST|H2_EV_RX_EOI, h2c->conn, h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02002431 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002432}
2433
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002434/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2435 * It may return an error in h2c or h2s. The caller must consider that the
2436 * return value is the new h2s in case one was allocated (most common case).
2437 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02002438 * errors here are reported as connection errors since it's impossible to
2439 * recover from such errors after the compression context has been altered.
2440 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002441static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02002442{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002443 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002444 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002445 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02002446 int error;
2447
Willy Tarreau7838a792019-08-12 18:42:03 +02002448 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2449
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002450 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002451 goto out; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02002452
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002453 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002454 goto out; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02002455
2456 /* now either the frame is complete or the buffer is complete */
2457 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01002458 /* The stream exists/existed, this must be a trailers frame */
2459 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002460 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2461 /* unrecoverable error ? */
2462 if (h2c->st0 >= H2_CS_ERROR)
2463 goto out;
2464
2465 if (error == 0)
2466 goto out; // missing data
2467
2468 if (error < 0) {
2469 /* Failed to decode this frame (e.g. too large request)
2470 * but the HPACK decompressor is still synchronized.
2471 */
2472 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2473 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002474 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002475 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002476 goto done;
2477 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002478 /* the connection was already killed by an RST, let's consume
2479 * the data and send another RST.
2480 */
2481 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2482 h2s = (struct h2s*)h2_error_stream;
2483 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002484 }
2485 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2486 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2487 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002488 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002489 goto conn_err;
2490 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002491 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2492 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002493
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002494 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002495
Willy Tarreau25919232019-01-03 14:48:18 +01002496 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002497 if (h2c->st0 >= H2_CS_ERROR)
2498 goto out;
2499
Willy Tarreau25919232019-01-03 14:48:18 +01002500 if (error <= 0) {
2501 if (error == 0)
2502 goto out; // missing data
2503
2504 /* Failed to decode this stream (e.g. too large request)
2505 * but the HPACK decompressor is still synchronized.
2506 */
2507 h2s = (struct h2s*)h2_error_stream;
2508 goto send_rst;
2509 }
2510
Willy Tarreau22de8d32018-09-05 19:55:58 +02002511 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002512 * positively from h2c_frt_stream_new(), the stream will report the error,
2513 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002514 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002515 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002516 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002517 h2s = (struct h2s*)h2_refused_stream;
2518 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002519 }
2520
2521 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002522 h2s->rxbuf = rxbuf;
2523 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002524 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002525
Willy Tarreau88d138e2019-01-02 19:38:14 +01002526 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002527 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002528 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002529
2530 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002531 if (h2s->st == H2_SS_OPEN)
2532 h2s->st = H2_SS_HREM;
2533 else
2534 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002535 }
2536
Willy Tarreau3a429f02019-01-03 11:41:50 +01002537 /* update the max stream ID if the request is being processed */
2538 if (h2s->id > h2c->max_id)
2539 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002540
Willy Tarreau022e5e52020-09-10 09:33:15 +02002541 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 +01002542 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002543
2544 conn_err:
2545 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002546 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002547
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002548 out:
2549 h2_release_buf(h2c, &rxbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02002550 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 +01002551 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002552
2553 send_rst:
2554 /* make the demux send an RST for the current stream. We may only
2555 * do this if we're certain that the HEADERS frame was properly
2556 * decompressed so that the HPACK decoder is still kept up to date.
2557 */
2558 h2_release_buf(h2c, &rxbuf);
2559 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002560
Willy Tarreau022e5e52020-09-10 09:33:15 +02002561 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 +02002562 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreau96a10c22018-12-23 18:30:44 +01002563 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002564}
2565
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002566/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2567 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2568 * errors here are reported as connection errors since it's impossible to
2569 * recover from such errors after the compression context has been altered.
2570 */
2571static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2572{
Christopher Faulet6884aa32019-09-23 15:28:20 +02002573 struct buffer rxbuf = BUF_NULL;
2574 unsigned long long body_len = 0;
2575 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002576 int error;
2577
Willy Tarreau7838a792019-08-12 18:42:03 +02002578 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2579
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002580 if (!b_size(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002581 goto fail; // empty buffer
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002582
2583 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002584 goto fail; // incomplete frame
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002585
Christopher Faulet6884aa32019-09-23 15:28:20 +02002586 if (h2s->st != H2_SS_CLOSED) {
2587 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2588 }
2589 else {
2590 /* the connection was already killed by an RST, let's consume
2591 * the data and send another RST.
2592 */
2593 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Christopher Fauletea7a7782019-09-26 16:19:13 +02002594 h2s = (struct h2s*)h2_error_stream;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002595 h2c->st0 = H2_CS_FRAME_E;
2596 goto send_rst;
2597 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002598
Willy Tarreau25919232019-01-03 14:48:18 +01002599 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002600 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002601 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002602
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002603 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2604 /* RFC7540#5.1 */
2605 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2606 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002607 goto fail;
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002608 }
2609
Willy Tarreau25919232019-01-03 14:48:18 +01002610 if (error <= 0) {
2611 if (error == 0)
Willy Tarreau7838a792019-08-12 18:42:03 +02002612 goto fail; // missing data
Willy Tarreau25919232019-01-03 14:48:18 +01002613
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002614 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002615 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002616 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002617 goto fail;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002618 }
2619
Christopher Fauletfa922f02019-05-07 10:55:17 +02002620 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002621 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002622
Willy Tarreau927b88b2019-03-04 08:03:25 +01002623 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002624 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002625 else if (h2s->flags & H2_SF_ES_RCVD) {
2626 if (h2s->st == H2_SS_OPEN)
2627 h2s->st = H2_SS_HREM;
2628 else if (h2s->st == H2_SS_HLOC)
2629 h2s_close(h2s);
2630 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002631
Willy Tarreau022e5e52020-09-10 09:33:15 +02002632 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 +02002633 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002634 return h2s;
Willy Tarreau7838a792019-08-12 18:42:03 +02002635 fail:
2636 TRACE_DEVEL("leaving on missing data or error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2637 return NULL;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002638
2639 send_rst:
2640 /* make the demux send an RST for the current stream. We may only
2641 * do this if we're certain that the HEADERS frame was properly
2642 * decompressed so that the HPACK decoder is still kept up to date.
2643 */
2644 h2_release_buf(h2c, &rxbuf);
2645 h2c->st0 = H2_CS_FRAME_E;
2646
Willy Tarreau022e5e52020-09-10 09:33:15 +02002647 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 +02002648 TRACE_DEVEL("leaving on error", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
2649 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002650}
2651
Willy Tarreau454f9052017-10-26 19:40:35 +02002652/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2653 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2654 */
2655static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2656{
2657 int error;
2658
Willy Tarreau7838a792019-08-12 18:42:03 +02002659 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
2660
Willy Tarreau454f9052017-10-26 19:40:35 +02002661 /* note that empty DATA frames are perfectly valid and sometimes used
2662 * to signal an end of stream (with the ES flag).
2663 */
2664
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002665 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau7838a792019-08-12 18:42:03 +02002666 goto fail; // empty buffer
Willy Tarreau454f9052017-10-26 19:40:35 +02002667
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002668 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau7838a792019-08-12 18:42:03 +02002669 goto fail; // incomplete frame
Willy Tarreau454f9052017-10-26 19:40:35 +02002670
2671 /* now either the frame is complete or the buffer is complete */
2672
Willy Tarreau454f9052017-10-26 19:40:35 +02002673 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2674 /* RFC7540#6.1 */
2675 error = H2_ERR_STREAM_CLOSED;
2676 goto strm_err;
2677 }
2678
Christopher Faulet4f09ec82019-06-19 09:25:58 +02002679 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002680 /* RFC7540#8.1.2 */
2681 error = H2_ERR_PROTOCOL_ERROR;
2682 goto strm_err;
2683 }
2684
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002685 if (!h2_frt_transfer_data(h2s))
Willy Tarreau7838a792019-08-12 18:42:03 +02002686 goto fail;
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002687
Willy Tarreau454f9052017-10-26 19:40:35 +02002688 /* call the upper layers to process the frame, then let the upper layer
2689 * notify the stream about any change.
2690 */
2691 if (!h2s->cs) {
Willy Tarreau082c4572019-08-06 10:11:02 +02002692 /* The upper layer has already closed, this may happen on
2693 * 4xx/redirects during POST, or when receiving a response
2694 * from an H2 server after the client has aborted.
2695 */
2696 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002697 goto strm_err;
2698 }
2699
Willy Tarreau8f650c32017-11-21 19:36:21 +01002700 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002701 goto fail;
Willy Tarreau8f650c32017-11-21 19:36:21 +01002702
Willy Tarreau721c9742017-11-07 11:05:42 +01002703 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002704 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002705 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002706 }
2707
2708 /* check for completion : the callee will change this to FRAME_A or
2709 * FRAME_H once done.
2710 */
2711 if (h2c->st0 == H2_CS_FRAME_P)
Willy Tarreau7838a792019-08-12 18:42:03 +02002712 goto fail;
Willy Tarreau454f9052017-10-26 19:40:35 +02002713
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002714 /* last frame */
2715 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002716 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002717 if (h2s->st == H2_SS_OPEN)
2718 h2s->st = H2_SS_HREM;
2719 else
2720 h2s_close(h2s);
2721
Willy Tarreau1915ca22019-01-24 11:49:37 +01002722 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2723 /* RFC7540#8.1.2 */
2724 error = H2_ERR_PROTOCOL_ERROR;
2725 goto strm_err;
2726 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002727 }
2728
Willy Tarreau7838a792019-08-12 18:42:03 +02002729 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02002730 return 1;
2731
Willy Tarreau454f9052017-10-26 19:40:35 +02002732 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002733 h2s_error(h2s, error);
2734 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02002735 fail:
2736 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 +02002737 return 0;
2738}
2739
Willy Tarreau63864812019-08-07 14:25:20 +02002740/* check that the current frame described in h2c->{dsi,dft,dfl,dff,...} is
2741 * valid for the current stream state. This is needed only after parsing the
2742 * frame header but in practice it can be performed at any time during
2743 * H2_CS_FRAME_P since no state transition happens there. Returns >0 on success
2744 * or 0 in case of error, in which case either h2s or h2c will carry an error.
2745 */
2746static int h2_frame_check_vs_state(struct h2c *h2c, struct h2s *h2s)
2747{
Willy Tarreau7838a792019-08-12 18:42:03 +02002748 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
2749
Willy Tarreau63864812019-08-07 14:25:20 +02002750 if (h2s->st == H2_SS_IDLE &&
2751 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2752 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2753 * this state MUST be treated as a connection error
2754 */
2755 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002756 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau63864812019-08-07 14:25:20 +02002757 /* only log if no other stream can report the error */
2758 sess_log(h2c->conn->owner);
2759 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002760 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 +02002761 return 0;
2762 }
2763
Willy Tarreau57a18162019-11-24 14:57:53 +01002764 if (h2s->st == H2_SS_IDLE && (h2c->flags & H2_CF_IS_BACK)) {
2765 /* only PUSH_PROMISE would be permitted here */
2766 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2767 TRACE_DEVEL("leaving in error (idle&back)", H2_EV_RX_FRAME|H2_EV_RX_FHDR|H2_EV_PROTO_ERR, h2c->conn, h2s);
2768 return 0;
2769 }
2770
Willy Tarreau63864812019-08-07 14:25:20 +02002771 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2772 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2773 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
2774 * this state MUST be treated as a stream error.
2775 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2776 * PUSH_PROMISE/CONTINUATION cause connection errors.
2777 */
2778 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)
2779 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2780 else
2781 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002782 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 +02002783 return 0;
2784 }
2785
2786 /* Below the management of frames received in closed state is a
2787 * bit hackish because the spec makes strong differences between
2788 * streams closed by receiving RST, sending RST, and seeing ES
2789 * in both directions. In addition to this, the creation of a
2790 * new stream reusing the identifier of a closed one will be
2791 * detected here. Given that we cannot keep track of all closed
2792 * streams forever, we consider that unknown closed streams were
2793 * closed on RST received, which allows us to respond with an
2794 * RST without breaking the connection (eg: to abort a transfer).
2795 * Some frames have to be silently ignored as well.
2796 */
2797 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
2798 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
2799 /* #5.1.1: The identifier of a newly
2800 * established stream MUST be numerically
2801 * greater than all streams that the initiating
2802 * endpoint has opened or reserved. This
2803 * governs streams that are opened using a
2804 * HEADERS frame and streams that are reserved
2805 * using PUSH_PROMISE. An endpoint that
2806 * receives an unexpected stream identifier
2807 * MUST respond with a connection error.
2808 */
2809 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002810 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 +02002811 return 0;
2812 }
2813
Willy Tarreau4c08f122019-09-26 08:47:15 +02002814 if (h2s->flags & H2_SF_RST_RCVD &&
2815 !(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 +02002816 /* RFC7540#5.1:closed: an endpoint that
2817 * receives any frame other than PRIORITY after
2818 * receiving a RST_STREAM MUST treat that as a
2819 * stream error of type STREAM_CLOSED.
2820 *
2821 * Note that old streams fall into this category
2822 * and will lead to an RST being sent.
2823 *
2824 * However, we cannot generalize this to all frame types. Those
2825 * carrying compression state must still be processed before
2826 * being dropped or we'll desynchronize the decoder. This can
2827 * happen with request trailers received after sending an
2828 * RST_STREAM, or with header/trailers responses received after
2829 * sending RST_STREAM (aborted stream).
Willy Tarreau4c08f122019-09-26 08:47:15 +02002830 *
2831 * In addition, since our CLOSED streams always carry the
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05002832 * RST_RCVD bit, we don't want to accidentally catch valid
Willy Tarreau4c08f122019-09-26 08:47:15 +02002833 * frames for a closed stream, i.e. RST/PRIO/WU.
Willy Tarreau63864812019-08-07 14:25:20 +02002834 */
2835 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2836 h2c->st0 = H2_CS_FRAME_E;
Christopher Faulet6884aa32019-09-23 15:28:20 +02002837 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 +02002838 return 0;
2839 }
2840
2841 /* RFC7540#5.1:closed: if this state is reached as a
2842 * result of sending a RST_STREAM frame, the peer that
2843 * receives the RST_STREAM might have already sent
2844 * frames on the stream that cannot be withdrawn. An
2845 * endpoint MUST ignore frames that it receives on
2846 * closed streams after it has sent a RST_STREAM
2847 * frame. An endpoint MAY choose to limit the period
2848 * over which it ignores frames and treat frames that
2849 * arrive after this time as being in error.
2850 */
2851 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
2852 /* RFC7540#5.1:closed: any frame other than
2853 * PRIO/WU/RST in this state MUST be treated as
2854 * a connection error
2855 */
2856 if (h2c->dft != H2_FT_RST_STREAM &&
2857 h2c->dft != H2_FT_PRIORITY &&
2858 h2c->dft != H2_FT_WINDOW_UPDATE) {
2859 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
Willy Tarreau7838a792019-08-12 18:42:03 +02002860 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 +02002861 return 0;
2862 }
2863 }
2864 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002865 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn, h2s);
Willy Tarreau63864812019-08-07 14:25:20 +02002866 return 1;
2867}
2868
Willy Tarreaubc933932017-10-09 16:21:43 +02002869/* process Rx frames to be demultiplexed */
2870static void h2_process_demux(struct h2c *h2c)
2871{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002872 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002873 struct h2_fh hdr;
2874 unsigned int padlen = 0;
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02002875 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02002876
Willy Tarreau7838a792019-08-12 18:42:03 +02002877 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
2878
Willy Tarreau081d4722017-05-16 21:51:05 +02002879 if (h2c->st0 >= H2_CS_ERROR)
Willy Tarreau7838a792019-08-12 18:42:03 +02002880 goto out;
Willy Tarreau52eed752017-09-22 15:05:09 +02002881
2882 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2883 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002884 TRACE_STATE("expecting preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau01b44822018-10-03 14:26:37 +02002885 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau7838a792019-08-12 18:42:03 +02002886 goto out;
2887
Willy Tarreau52eed752017-09-22 15:05:09 +02002888 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
2889 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002890 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002891 TRACE_PROTO("failed to receive preface", H2_EV_RX_PREFACE|H2_EV_PROTO_ERR, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002892 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002893 sess_log(h2c->conn->owner);
2894 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002895 goto fail;
2896 }
Willy Tarreau7838a792019-08-12 18:42:03 +02002897 TRACE_PROTO("received preface", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002898
2899 h2c->max_id = 0;
2900 h2c->st0 = H2_CS_SETTINGS1;
Willy Tarreau7838a792019-08-12 18:42:03 +02002901 TRACE_STATE("switching to SETTINGS1", H2_EV_RX_PREFACE, h2c->conn);
Willy Tarreau52eed752017-09-22 15:05:09 +02002902 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002903
2904 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002905 /* ensure that what is pending is a valid SETTINGS frame
2906 * without an ACK.
2907 */
Willy Tarreau7838a792019-08-12 18:42:03 +02002908 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 +02002909 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002910 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002911 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002912 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 +02002913 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002914 if (!(h2c->flags & H2_CF_IS_BACK))
2915 sess_log(h2c->conn->owner);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002916 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002917 goto fail;
2918 }
2919
2920 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
2921 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002922 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 +02002923 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2924 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002925 if (!(h2c->flags & H2_CF_IS_BACK))
2926 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002927 goto fail;
2928 }
2929
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002930 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002931 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau7838a792019-08-12 18:42:03 +02002932 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 +02002933 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2934 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002935 if (!(h2c->flags & H2_CF_IS_BACK))
2936 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002937 goto fail;
2938 }
2939
Willy Tarreau3bf69182018-12-21 15:34:50 +01002940 /* that's OK, switch to FRAME_P to process it. This is
2941 * a SETTINGS frame whose header has already been
2942 * deleted above.
2943 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01002944 padlen = 0;
2945 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002946 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002947 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002948
2949 /* process as many incoming frames as possible below */
Willy Tarreau7838a792019-08-12 18:42:03 +02002950 while (1) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002951 int ret = 0;
2952
Willy Tarreau7838a792019-08-12 18:42:03 +02002953 if (!b_data(&h2c->dbuf)) {
2954 TRACE_DEVEL("no more Rx data", H2_EV_RX_FRAME, h2c->conn);
2955 break;
2956 }
2957
2958 if (h2c->st0 >= H2_CS_ERROR) {
2959 TRACE_STATE("end of connection reported", H2_EV_RX_FRAME|H2_EV_RX_EOI, h2c->conn);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002960 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02002961 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002962
2963 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreau30d05f32019-08-06 15:49:51 +02002964 h2c->rcvd_s = 0;
2965
Willy Tarreau7838a792019-08-12 18:42:03 +02002966 TRACE_STATE("expecting H2 frame header", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
Willy Tarreaua4428bd2018-12-22 18:11:41 +01002967 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02002968 break;
2969
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002970 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002971 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 +02002972 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002973 if (!h2c->nb_streams && !(h2c->flags & H2_CF_IS_BACK)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02002974 /* only log if no other stream can report the error */
2975 sess_log(h2c->conn->owner);
2976 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002977 break;
2978 }
2979
Christopher Fauletdd2a5622019-06-18 12:22:38 +02002980 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002981 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
2982 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
2983 * we read the pad length and drop it from the remaining
2984 * payload (one byte + the 9 remaining ones = 10 total
2985 * removed), so we have a frame payload starting after the
2986 * pad len. Flow controlled frames (DATA) also count the
2987 * padlen in the flow control, so it must be adjusted.
2988 */
2989 if (hdr.len < 1) {
Willy Tarreau7838a792019-08-12 18:42:03 +02002990 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 +01002991 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02002992 if (!(h2c->flags & H2_CF_IS_BACK))
2993 sess_log(h2c->conn->owner);
Willy Tarreau3bf69182018-12-21 15:34:50 +01002994 goto fail;
2995 }
2996 hdr.len--;
2997
2998 if (b_data(&h2c->dbuf) < 10)
2999 break; // missing padlen
3000
3001 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
3002
3003 if (padlen > hdr.len) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003004 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 +01003005 /* RFC7540#6.1 : pad length = length of
3006 * frame payload or greater => error.
3007 */
3008 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003009 if (!(h2c->flags & H2_CF_IS_BACK))
3010 sess_log(h2c->conn->owner);
Willy Tarreau3bf69182018-12-21 15:34:50 +01003011 goto fail;
3012 }
3013
3014 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
3015 h2c->rcvd_c++;
3016 h2c->rcvd_s++;
3017 }
3018 b_del(&h2c->dbuf, 1);
3019 }
3020 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003021
3022 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02003023 h2c->dfl = hdr.len;
3024 h2c->dsi = hdr.sid;
3025 h2c->dft = hdr.ft;
3026 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01003027 h2c->dpl = padlen;
Willy Tarreau73db4342019-09-25 07:28:44 +02003028 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 +02003029 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01003030
3031 /* check for minimum basic frame format validity */
3032 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
3033 if (ret != H2_ERR_NO_ERROR) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003034 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 +01003035 h2c_error(h2c, ret);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003036 if (!(h2c->flags & H2_CF_IS_BACK))
3037 sess_log(h2c->conn->owner);
Willy Tarreau54f46e52019-01-30 15:11:03 +01003038 goto fail;
3039 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003040 }
3041
Willy Tarreau9fd5aa82019-08-06 15:21:45 +02003042 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
3043 * H2_CS_FRAME_P indicates an incomplete previous operation
3044 * (most often the first attempt) and requires some validity
3045 * checks for the frame and the current state. The two other
3046 * ones are set after completion (or abortion) and must skip
3047 * validity checks.
3048 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003049 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
3050
Willy Tarreau567beb82018-12-18 16:52:44 +01003051 if (tmp_h2s != h2s && h2s && h2s->cs &&
3052 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003053 conn_xprt_read0_pending(h2c->conn) ||
3054 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003055 (h2s->flags & H2_SF_ES_RCVD) ||
3056 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003057 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003058 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 +01003059 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003060 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003061 }
3062 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02003063
Willy Tarreau63864812019-08-07 14:25:20 +02003064 if (h2c->st0 == H2_CS_FRAME_E ||
Willy Tarreau7838a792019-08-12 18:42:03 +02003065 (h2c->st0 == H2_CS_FRAME_P && !h2_frame_check_vs_state(h2c, h2s))) {
3066 TRACE_PROTO("stream error reported", H2_EV_RX_FRAME|H2_EV_PROTO_ERR, h2c->conn, h2s);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003067 goto strm_err;
Willy Tarreau7838a792019-08-12 18:42:03 +02003068 }
Willy Tarreauc0da1962017-10-30 18:38:00 +01003069
Willy Tarreau7e98c052017-10-10 15:56:59 +02003070 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02003071 case H2_FT_SETTINGS:
Willy Tarreau7838a792019-08-12 18:42:03 +02003072 if (h2c->st0 == H2_CS_FRAME_P) {
3073 TRACE_PROTO("receiving H2 SETTINGS frame", H2_EV_RX_FRAME|H2_EV_RX_SETTINGS, h2c->conn, h2s);
Willy Tarreau3421aba2017-07-27 15:41:03 +02003074 ret = h2c_handle_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003075 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003076
Willy Tarreau7838a792019-08-12 18:42:03 +02003077 if (h2c->st0 == H2_CS_FRAME_A) {
3078 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 +02003079 ret = h2c_ack_settings(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003080 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02003081 break;
3082
Willy Tarreaucf68c782017-10-10 17:11:41 +02003083 case H2_FT_PING:
Willy Tarreau7838a792019-08-12 18:42:03 +02003084 if (h2c->st0 == H2_CS_FRAME_P) {
3085 TRACE_PROTO("receiving H2 PING frame", H2_EV_RX_FRAME|H2_EV_RX_PING, h2c->conn, h2s);
Willy Tarreaucf68c782017-10-10 17:11:41 +02003086 ret = h2c_handle_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003087 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003088
Willy Tarreau7838a792019-08-12 18:42:03 +02003089 if (h2c->st0 == H2_CS_FRAME_A) {
3090 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 +02003091 ret = h2c_ack_ping(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003092 }
Willy Tarreaucf68c782017-10-10 17:11:41 +02003093 break;
3094
Willy Tarreau26f95952017-07-27 17:18:30 +02003095 case H2_FT_WINDOW_UPDATE:
Willy Tarreau7838a792019-08-12 18:42:03 +02003096 if (h2c->st0 == H2_CS_FRAME_P) {
3097 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 +02003098 ret = h2c_handle_window_update(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003099 }
Willy Tarreau26f95952017-07-27 17:18:30 +02003100 break;
3101
Willy Tarreau61290ec2017-10-17 08:19:21 +02003102 case H2_FT_CONTINUATION:
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05003103 /* RFC7540#6.10: CONTINUATION may only be preceded by
Willy Tarreauea18f862018-12-22 20:19:26 +01003104 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
3105 * frames' parsers consume all following CONTINUATION
3106 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02003107 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003108 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 +01003109 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003110 if (!(h2c->flags & H2_CF_IS_BACK))
3111 sess_log(h2c->conn->owner);
Willy Tarreauea18f862018-12-22 20:19:26 +01003112 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02003113
Willy Tarreau13278b42017-10-13 19:23:14 +02003114 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003115 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003116 TRACE_PROTO("receiving H2 HEADERS frame", H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn, h2s);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02003117 if (h2c->flags & H2_CF_IS_BACK)
3118 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
3119 else
3120 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003121 if (tmp_h2s) {
3122 h2s = tmp_h2s;
3123 ret = 1;
3124 }
3125 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003126 break;
3127
Willy Tarreau454f9052017-10-26 19:40:35 +02003128 case H2_FT_DATA:
Willy Tarreau7838a792019-08-12 18:42:03 +02003129 if (h2c->st0 == H2_CS_FRAME_P) {
3130 TRACE_PROTO("receiving H2 DATA frame", H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454f9052017-10-26 19:40:35 +02003131 ret = h2c_frt_handle_data(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003132 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003133
Willy Tarreau7838a792019-08-12 18:42:03 +02003134 if (h2c->st0 == H2_CS_FRAME_A) {
3135 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 +02003136 ret = h2c_send_strm_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003137 }
Willy Tarreau454f9052017-10-26 19:40:35 +02003138 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02003139
Willy Tarreau92153fc2017-12-03 19:46:19 +01003140 case H2_FT_PRIORITY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003141 if (h2c->st0 == H2_CS_FRAME_P) {
3142 TRACE_PROTO("receiving H2 PRIORITY frame", H2_EV_RX_FRAME|H2_EV_RX_PRIO, h2c->conn, h2s);
Willy Tarreau92153fc2017-12-03 19:46:19 +01003143 ret = h2c_handle_priority(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003144 }
Willy Tarreau92153fc2017-12-03 19:46:19 +01003145 break;
3146
Willy Tarreaucd234e92017-08-18 10:59:39 +02003147 case H2_FT_RST_STREAM:
Willy Tarreau7838a792019-08-12 18:42:03 +02003148 if (h2c->st0 == H2_CS_FRAME_P) {
3149 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 +02003150 ret = h2c_handle_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003151 }
Willy Tarreaucd234e92017-08-18 10:59:39 +02003152 break;
3153
Willy Tarreaue96b0922017-10-30 00:28:29 +01003154 case H2_FT_GOAWAY:
Willy Tarreau7838a792019-08-12 18:42:03 +02003155 if (h2c->st0 == H2_CS_FRAME_P) {
3156 TRACE_PROTO("receiving H2 GOAWAY frame", H2_EV_RX_FRAME|H2_EV_RX_GOAWAY, h2c->conn, h2s);
Willy Tarreaue96b0922017-10-30 00:28:29 +01003157 ret = h2c_handle_goaway(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003158 }
Willy Tarreaue96b0922017-10-30 00:28:29 +01003159 break;
3160
Willy Tarreau1c661982017-10-30 13:52:01 +01003161 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02003162 default:
Willy Tarreau7838a792019-08-12 18:42:03 +02003163 TRACE_PROTO("receiving H2 ignored frame", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003164 /* drop frames that we ignore. They may be larger than
3165 * the buffer so we drain all of their contents until
3166 * we reach the end.
3167 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003168 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3169 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003170 h2c->dfl -= ret;
3171 ret = h2c->dfl == 0;
3172 }
3173
Willy Tarreauf182a9a2017-10-30 12:03:50 +01003174 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01003175 /* We may have to send an RST if not done yet */
Willy Tarreau7838a792019-08-12 18:42:03 +02003176 if (h2s->st == H2_SS_ERROR) {
3177 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 +01003178 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau7838a792019-08-12 18:42:03 +02003179 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003180
Willy Tarreau7838a792019-08-12 18:42:03 +02003181 if (h2c->st0 == H2_CS_FRAME_E) {
3182 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 +01003183 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02003184 }
Willy Tarreau27a84c92017-10-17 08:10:17 +02003185
Willy Tarreau7e98c052017-10-10 15:56:59 +02003186 /* error or missing data condition met above ? */
Willy Tarreau7838a792019-08-12 18:42:03 +02003187 if (ret <= 0) {
3188 TRACE_DEVEL("insufficient data to proceed", H2_EV_RX_FRAME, h2c->conn, h2s);
Willy Tarreau7e98c052017-10-10 15:56:59 +02003189 break;
Willy Tarreau7838a792019-08-12 18:42:03 +02003190 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003191
3192 if (h2c->st0 != H2_CS_FRAME_H) {
Christopher Faulet5112a602019-09-26 16:38:28 +02003193 TRACE_DEVEL("stream error, skip frame payload", H2_EV_RX_FRAME, h2c->conn, h2s);
3194 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
3195 b_del(&h2c->dbuf, ret);
3196 h2c->dfl -= ret;
3197 if (!h2c->dfl) {
3198 TRACE_STATE("switching to FRAME_H", H2_EV_RX_FRAME|H2_EV_RX_FHDR, h2c->conn);
3199 h2c->st0 = H2_CS_FRAME_H;
3200 h2c->dsi = -1;
3201 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02003202 }
3203 }
Willy Tarreau52eed752017-09-22 15:05:09 +02003204
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003205 if (h2c->rcvd_c > 0 &&
Willy Tarreau7838a792019-08-12 18:42:03 +02003206 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))) {
3207 TRACE_PROTO("sending H2 WINDOW_UPDATE frame", H2_EV_TX_FRAME|H2_EV_TX_WU, h2c->conn);
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003208 h2c_send_conn_wu(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003209 }
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003210
Willy Tarreau52eed752017-09-22 15:05:09 +02003211 fail:
3212 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01003213 if (h2s && h2s->cs &&
3214 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02003215 conn_xprt_read0_pending(h2c->conn) ||
3216 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02003217 (h2s->flags & H2_SF_ES_RCVD) ||
3218 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003219 /* we may have to signal the upper layers */
Willy Tarreau7838a792019-08-12 18:42:03 +02003220 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 +01003221 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01003222 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01003223 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01003224
Willy Tarreau7838a792019-08-12 18:42:03 +02003225 if (old_iw != h2c->miw) {
3226 TRACE_STATE("notifying streams about SFCTL increase", H2_EV_RX_FRAME|H2_EV_H2S_WAKE, h2c->conn);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003227 h2c_unblock_sfctl(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003228 }
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02003229
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003230 h2c_restart_reading(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003231 out:
3232 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
Willy Tarreaubc933932017-10-09 16:21:43 +02003233}
3234
Willy Tarreau989539b2020-01-10 17:01:29 +01003235/* resume each h2s eligible for sending in list head <head> */
3236static void h2_resume_each_sending_h2s(struct h2c *h2c, struct list *head)
3237{
3238 struct h2s *h2s, *h2s_back;
3239
3240 TRACE_ENTER(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3241
3242 list_for_each_entry_safe(h2s, h2s_back, head, list) {
3243 if (h2c->mws <= 0 ||
3244 h2c->flags & H2_CF_MUX_BLOCK_ANY ||
3245 h2c->st0 >= H2_CS_ERROR)
3246 break;
3247
3248 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003249
Willy Tarreaud9464162020-01-10 18:25:07 +01003250 if (h2s->flags & H2_SF_NOTIFIED)
Willy Tarreau70c5b0e2020-01-10 18:20:15 +01003251 continue;
3252
Willy Tarreau5723f292020-01-10 15:16:57 +01003253 /* If the sender changed his mind and unsubscribed, let's just
3254 * remove the stream from the send_list.
Willy Tarreau989539b2020-01-10 17:01:29 +01003255 */
Willy Tarreauf96508a2020-01-10 11:12:48 +01003256 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) &&
3257 (!h2s->subs || !(h2s->subs->events & SUB_RETRY_SEND))) {
Willy Tarreau989539b2020-01-10 17:01:29 +01003258 LIST_DEL_INIT(&h2s->list);
3259 continue;
3260 }
3261
Willy Tarreauf96508a2020-01-10 11:12:48 +01003262 if (h2s->subs && h2s->subs->events & SUB_RETRY_SEND) {
Willy Tarreau5723f292020-01-10 15:16:57 +01003263 h2s->flags |= H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01003264 tasklet_wakeup(h2s->subs->tasklet);
3265 h2s->subs->events &= ~SUB_RETRY_SEND;
3266 if (!h2s->subs->events)
3267 h2s->subs = NULL;
Willy Tarreau5723f292020-01-10 15:16:57 +01003268 }
3269 else if (h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW)) {
3270 tasklet_wakeup(h2s->shut_tl);
3271 }
Willy Tarreau989539b2020-01-10 17:01:29 +01003272 }
3273
3274 TRACE_LEAVE(H2_EV_H2C_SEND|H2_EV_H2S_WAKE, h2c->conn);
3275}
3276
Willy Tarreaubc933932017-10-09 16:21:43 +02003277/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
3278 * the end.
3279 */
3280static int h2_process_mux(struct h2c *h2c)
3281{
Willy Tarreau7838a792019-08-12 18:42:03 +02003282 TRACE_ENTER(H2_EV_H2C_WAKE, h2c->conn);
3283
Willy Tarreau01b44822018-10-03 14:26:37 +02003284 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
3285 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
3286 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
3287 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau9364a5f2019-10-23 11:06:35 +02003288 if (h2c->st0 == H2_CS_ERROR)
Willy Tarreau01b44822018-10-03 14:26:37 +02003289 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau01b44822018-10-03 14:26:37 +02003290 goto fail;
3291 }
3292 h2c->st0 = H2_CS_SETTINGS1;
3293 }
3294 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01003295 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau7838a792019-08-12 18:42:03 +02003296 goto done;
Willy Tarreau01b44822018-10-03 14:26:37 +02003297 }
3298
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003299 /* start by sending possibly pending window updates */
Willy Tarreaue74679a2019-08-06 15:39:32 +02003300 if (h2c->rcvd_s > 0 &&
3301 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3302 h2c_send_strm_wu(h2c) < 0)
3303 goto fail;
3304
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003305 if (h2c->rcvd_c > 0 &&
3306 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
3307 h2c_send_conn_wu(h2c) < 0)
3308 goto fail;
3309
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003310 /* First we always process the flow control list because the streams
3311 * waiting there were already elected for immediate emission but were
3312 * blocked just on this.
3313 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003314 h2_resume_each_sending_h2s(h2c, &h2c->fctl_list);
3315 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02003316
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02003317 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01003318 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02003319 if (h2c->st0 == H2_CS_ERROR) {
3320 if (h2c->max_id >= 0) {
3321 h2c_send_goaway_error(h2c, NULL);
3322 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
Willy Tarreau7838a792019-08-12 18:42:03 +02003323 goto out0;
Willy Tarreau081d4722017-05-16 21:51:05 +02003324 }
3325
3326 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
3327 }
Willy Tarreau081d4722017-05-16 21:51:05 +02003328 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003329 done:
3330 TRACE_LEAVE(H2_EV_H2C_WAKE, h2c->conn);
3331 return 1;
3332 out0:
3333 TRACE_DEVEL("leaving in blocked situation", H2_EV_H2C_WAKE, h2c->conn);
3334 return 0;
Willy Tarreaubc933932017-10-09 16:21:43 +02003335}
3336
Willy Tarreau62f52692017-10-08 23:01:42 +02003337
Willy Tarreau479998a2018-11-18 06:30:59 +01003338/* Attempt to read data, and subscribe if none available.
3339 * The function returns 1 if data has been received, otherwise zero.
3340 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003341static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003342{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003343 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003344 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003345 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02003346 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003347
Willy Tarreau7838a792019-08-12 18:42:03 +02003348 TRACE_ENTER(H2_EV_H2C_RECV, h2c->conn);
3349
3350 if (h2c->wait_event.events & SUB_RETRY_RECV) {
3351 TRACE_DEVEL("leaving on sub_recv", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003352 return (b_data(&h2c->dbuf));
Willy Tarreau7838a792019-08-12 18:42:03 +02003353 }
Olivier Houchardaf4021e2018-08-09 13:06:55 +02003354
Willy Tarreau7838a792019-08-12 18:42:03 +02003355 if (!h2_recv_allowed(h2c)) {
3356 TRACE_DEVEL("leaving on !recv_allowed", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003357 return 1;
Willy Tarreau7838a792019-08-12 18:42:03 +02003358 }
Willy Tarreaua2af5122017-10-09 11:56:46 +02003359
Willy Tarreau44e973f2018-03-01 17:49:30 +01003360 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003361 if (!buf) {
3362 h2c->flags |= H2_CF_DEM_DALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02003363 TRACE_DEVEL("leaving on !alloc", H2_EV_H2C_RECV, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003364 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02003365 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02003366
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003367 b_realign_if_empty(buf);
3368 if (!b_data(buf)) {
3369 /* try to pre-align the buffer like the
3370 * rxbufs will be to optimize memory copies. We'll make
3371 * sure that the frame header lands at the end of the
3372 * HTX block to alias it upon recv. We cannot use the
3373 * head because rcv_buf() will realign the buffer if
3374 * it's empty. Thus we cheat and pretend we already
3375 * have a few bytes there.
3376 */
3377 max = buf_room_for_htx_data(buf) + 9;
3378 buf->head = sizeof(struct htx) - 9;
3379 }
3380 else
3381 max = b_room(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01003382
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003383 ret = max ? conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0) : 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003384
Willy Tarreau7838a792019-08-12 18:42:03 +02003385 if (max && !ret && h2_recv_allowed(h2c)) {
3386 TRACE_DATA("failed to receive data, subscribing", H2_EV_H2C_RECV, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003387 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003388 } else if (ret)
Willy Tarreau022e5e52020-09-10 09:33:15 +02003389 TRACE_DATA("received data", H2_EV_H2C_RECV, h2c->conn, 0, 0, (void*)(long)ret);
Olivier Houchard81a15af2018-10-19 17:26:49 +02003390
Olivier Houcharda1411e62018-08-17 18:42:48 +02003391 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01003392 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02003393 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Olivier Houchard46677732018-11-29 17:06:17 +01003394 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003395 }
3396
Willy Tarreau7838a792019-08-12 18:42:03 +02003397 if (b_data(buf) == buf->size) {
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003398 h2c->flags |= H2_CF_DEM_DFULL;
Willy Tarreau35fb8462019-10-02 11:05:46 +02003399 TRACE_STATE("demux buffer full", H2_EV_H2C_RECV|H2_EV_H2C_BLK, h2c->conn);
Willy Tarreau7838a792019-08-12 18:42:03 +02003400 }
3401
3402 TRACE_LEAVE(H2_EV_H2C_RECV, h2c->conn);
Willy Tarreau4d7a8842019-07-31 16:00:48 +02003403 return !!ret || (conn->flags & CO_FL_ERROR) || conn_xprt_read0_pending(conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003404}
3405
Willy Tarreau479998a2018-11-18 06:30:59 +01003406/* Try to send data if possible.
3407 * The function returns 1 if data have been sent, otherwise zero.
3408 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003409static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003410{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003411 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02003412 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003413 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003414
Willy Tarreau7838a792019-08-12 18:42:03 +02003415 TRACE_ENTER(H2_EV_H2C_SEND, h2c->conn);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003416
Willy Tarreau7838a792019-08-12 18:42:03 +02003417 if (conn->flags & CO_FL_ERROR) {
3418 TRACE_DEVEL("leaving on error", H2_EV_H2C_SEND, h2c->conn);
3419 return 1;
3420 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003421
Willy Tarreau911db9b2020-01-23 16:27:54 +01003422 if (conn->flags & CO_FL_WAIT_XPRT) {
Willy Tarreaua2af5122017-10-09 11:56:46 +02003423 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003424 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003425 }
3426
Willy Tarreaubc933932017-10-09 16:21:43 +02003427 /* This loop is quite simple : it tries to fill as much as it can from
3428 * pending streams into the existing buffer until it's reportedly full
3429 * or the end of send requests is reached. Then it tries to send this
3430 * buffer's contents out, marks it not full if at least one byte could
3431 * be sent, and tries again.
3432 *
3433 * The snd_buf() function normally takes a "flags" argument which may
3434 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
3435 * data immediately comes and CO_SFL_STREAMER to indicate that the
3436 * connection is streaming lots of data (used to increase TLS record
3437 * size at the expense of latency). The former can be sent any time
3438 * there's a buffer full flag, as it indicates at least one stream
3439 * attempted to send and failed so there are pending data. An
3440 * alternative would be to set it as long as there's an active stream
3441 * but that would be problematic for ACKs until we have an absolute
3442 * guarantee that all waiters have at least one byte to send. The
3443 * latter should possibly not be set for now.
3444 */
3445
3446 done = 0;
3447 while (!done) {
3448 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003449 unsigned int released = 0;
3450 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02003451
3452 /* fill as much as we can into the current buffer */
3453 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
3454 done = h2_process_mux(h2c);
3455
Olivier Houchard2b094432019-01-29 18:28:36 +01003456 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003457 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01003458
Willy Tarreaubc933932017-10-09 16:21:43 +02003459 if (conn->flags & CO_FL_ERROR)
3460 break;
3461
3462 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
3463 flags |= CO_SFL_MSG_MORE;
3464
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003465 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3466 if (b_data(buf)) {
3467 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003468 if (!ret) {
3469 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003470 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003471 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003472 sent = 1;
Willy Tarreau022e5e52020-09-10 09:33:15 +02003473 TRACE_DATA("sent data", H2_EV_H2C_SEND, h2c->conn, 0, buf, (void*)(long)ret);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003474 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003475 if (b_data(buf)) {
3476 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003477 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003478 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003479 }
3480 b_free(buf);
3481 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02003482 }
Willy Tarreaubc933932017-10-09 16:21:43 +02003483
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003484 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003485 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003486
Willy Tarreaubc933932017-10-09 16:21:43 +02003487 /* wrote at least one byte, the buffer is not full anymore */
Christopher Faulet69fe5ce2019-10-24 10:31:01 +02003488 if (sent)
3489 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
Willy Tarreaubc933932017-10-09 16:21:43 +02003490 }
3491
Willy Tarreaua2af5122017-10-09 11:56:46 +02003492 if (conn->flags & CO_FL_SOCK_WR_SH) {
3493 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02003494 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02003495 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02003496 /* We're not full anymore, so we can wake any task that are waiting
3497 * for us.
3498 */
Willy Tarreau989539b2020-01-10 17:01:29 +01003499 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM)) && h2c->st0 >= H2_CS_FRAME_H)
3500 h2_resume_each_sending_h2s(h2c, &h2c->send_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01003501
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003502 /* We're done, no more to send */
Willy Tarreau7838a792019-08-12 18:42:03 +02003503 if (!br_data(h2c->mbuf)) {
3504 TRACE_DEVEL("leaving with everything sent", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003505 return sent;
Willy Tarreau7838a792019-08-12 18:42:03 +02003506 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003507schedule:
Willy Tarreau7838a792019-08-12 18:42:03 +02003508 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND)) {
3509 TRACE_STATE("more data to send, subscribing", H2_EV_H2C_SEND, h2c->conn);
Olivier Houcharde179d0e2019-03-21 18:27:17 +01003510 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7838a792019-08-12 18:42:03 +02003511 }
Willy Tarreau7f1265a2019-05-29 17:36:37 +02003512
Willy Tarreau7838a792019-08-12 18:42:03 +02003513 TRACE_DEVEL("leaving with some data left to send", H2_EV_H2C_SEND, h2c->conn);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02003514 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003515}
3516
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003517/* this is the tasklet referenced in h2c->wait_event.tasklet */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003518static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
3519{
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003520 struct connection *conn;
3521 struct tasklet *tl = (struct tasklet *)t;
3522 int conn_in_list;
3523 struct h2c *h2c;
Olivier Houchard7505f942018-08-21 18:10:44 +02003524 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02003525
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003526
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003527 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003528 if (t->context == NULL) {
3529 /* The connection has been taken over by another thread,
3530 * we're no longer responsible for it, so just free the
3531 * tasklet, and do nothing.
3532 */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003533 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003534 tasklet_free(tl);
Willy Tarreau38468772020-06-28 00:31:13 +02003535 goto leave;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003536 }
3537 h2c = ctx;
3538 conn = h2c->conn;
3539
3540 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3541
3542 conn_in_list = conn->flags & CO_FL_LIST_MASK;
3543
3544 /* Remove the connection from the list, to be sure nobody attempts
3545 * to use it while we handle the I/O events
3546 */
3547 if (conn_in_list)
3548 MT_LIST_DEL(&conn->list);
3549
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003550 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau7838a792019-08-12 18:42:03 +02003551
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003552 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02003553 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003554 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02003555 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01003556 if (ret || b_data(&h2c->dbuf))
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003557 ret = h2_process(h2c);
3558
3559 /* If we were in an idle list, we want to add it back into it,
3560 * unless h2_process() returned -1, which mean it has destroyed
3561 * the connection (testing !ret is enough, if h2_process() wasn't
3562 * called then ret will be 0 anyway.
3563 */
3564 if (!ret && conn_in_list) {
3565 struct server *srv = objt_server(conn->target);
3566
3567 if (conn_in_list == CO_FL_SAFE_LIST)
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003568 MT_LIST_ADDQ(&srv->safe_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003569 else
Willy Tarreaua9d7b762020-07-10 08:28:20 +02003570 MT_LIST_ADDQ(&srv->idle_conns[tid], &conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003571 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003572
Willy Tarreau38468772020-06-28 00:31:13 +02003573leave:
Willy Tarreau7838a792019-08-12 18:42:03 +02003574 TRACE_LEAVE(H2_EV_H2C_WAKE);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003575 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003576}
Willy Tarreaua2af5122017-10-09 11:56:46 +02003577
Willy Tarreau62f52692017-10-08 23:01:42 +02003578/* callback called on any event by the connection handler.
3579 * It applies changes and returns zero, or < 0 if it wants immediate
3580 * destruction of the connection (which normally doesn not happen in h2).
3581 */
Olivier Houchard7505f942018-08-21 18:10:44 +02003582static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02003583{
Olivier Houchard7505f942018-08-21 18:10:44 +02003584 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02003585
Willy Tarreau7838a792019-08-12 18:42:03 +02003586 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3587
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003588 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01003589 h2_process_demux(h2c);
3590
3591 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003592 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003593
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003594 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01003595 h2c->flags &= ~H2_CF_DEM_DFULL;
3596 }
Olivier Houchard7505f942018-08-21 18:10:44 +02003597 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01003598
Willy Tarreau0b37d652018-10-03 10:33:02 +02003599 if (unlikely(h2c->proxy->state == PR_STSTOPPED)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01003600 /* frontend is stopping, reload likely in progress, let's try
3601 * to announce a graceful shutdown if not yet done. We don't
3602 * care if it fails, it will be tried again later.
3603 */
Willy Tarreau7838a792019-08-12 18:42:03 +02003604 TRACE_STATE("proxy stopped, sending GOAWAY", H2_EV_H2C_WAKE|H2_EV_TX_FRAME, conn);
Willy Tarreau8ec14062017-12-30 18:08:13 +01003605 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3606 if (h2c->last_sid < 0)
3607 h2c->last_sid = (1U << 31) - 1;
3608 h2c_send_goaway_error(h2c, NULL);
3609 }
3610 }
3611
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003612 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003613 * If we received early data, and the handshake is done, wake
3614 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003615 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003616 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
Willy Tarreau911db9b2020-01-23 16:27:54 +01003617 (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 +01003618 struct eb32_node *node;
3619 struct h2s *h2s;
3620
3621 h2c->flags |= H2_CF_WAIT_FOR_HS;
3622 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3623
3624 while (node) {
3625 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003626 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003627 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003628 node = eb32_next(node);
3629 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003630 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003631
Willy Tarreau26bd7612017-10-09 16:47:04 +02003632 if (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003633 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3634 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3635 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003636 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003637
3638 if (eb_is_empty(&h2c->streams_by_id)) {
3639 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003640 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003641 TRACE_DEVEL("leaving after releasing the connection", H2_EV_H2C_WAKE);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003642 return -1;
3643 }
Willy Tarreau4481e262019-10-31 15:36:30 +01003644
3645 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003646 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003647 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003648 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003649 }
3650 else if (h2c->st0 == H2_CS_ERROR) {
3651 /* connections in error must be removed from the idle lists */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003652 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003653 MT_LIST_DEL((struct mt_list *)&conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003654 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003655 }
3656
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003657 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003658 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003659
Olivier Houchard53216e72018-10-10 15:46:36 +02003660 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3661 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3662 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003663 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003664 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3665 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003666 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003667
Willy Tarreau3f133572017-10-31 19:21:06 +01003668 if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003669 if (h2c_may_expire(h2c))
3670 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3671 else
3672 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02003673 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003674 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003675
Olivier Houchard7505f942018-08-21 18:10:44 +02003676 h2_send(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003677 TRACE_LEAVE(H2_EV_H2C_WAKE, conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02003678 return 0;
3679}
3680
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003681/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003682static int h2_wake(struct connection *conn)
3683{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003684 struct h2c *h2c = conn->ctx;
Willy Tarreau7838a792019-08-12 18:42:03 +02003685 int ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003686
Willy Tarreau7838a792019-08-12 18:42:03 +02003687 TRACE_ENTER(H2_EV_H2C_WAKE, conn);
3688 ret = h2_process(h2c);
Willy Tarreau508f9892020-02-11 04:38:56 +01003689 if (ret >= 0)
3690 h2_wake_some_streams(h2c, 0);
Willy Tarreau7838a792019-08-12 18:42:03 +02003691 TRACE_LEAVE(H2_EV_H2C_WAKE);
3692 return ret;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003693}
3694
Willy Tarreauea392822017-10-31 10:02:25 +01003695/* Connection timeout management. The principle is that if there's no receipt
3696 * nor sending for a certain amount of time, the connection is closed. If the
3697 * MUX buffer still has lying data or is not allocatable, the connection is
3698 * immediately killed. If it's allocatable and empty, we attempt to send a
3699 * GOAWAY frame.
3700 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003701static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003702{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003703 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003704 int expired = tick_is_expired(t->expire, now_ms);
3705
Willy Tarreau7838a792019-08-12 18:42:03 +02003706 TRACE_ENTER(H2_EV_H2C_WAKE, h2c ? h2c->conn : NULL);
3707
Willy Tarreaubd42e922020-06-30 11:19:23 +02003708 if (h2c) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003709 /* Make sure nobody stole the connection from us */
3710 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
3711
3712 /* Somebody already stole the connection from us, so we should not
3713 * free it, we just have to free the task.
3714 */
3715 if (!t->context) {
3716 h2c = NULL;
Willy Tarreau46ac7812020-07-04 07:16:18 +02003717 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003718 goto do_leave;
3719 }
3720
3721
Willy Tarreaubd42e922020-06-30 11:19:23 +02003722 if (!expired) {
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003723 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003724 TRACE_DEVEL("leaving (not expired)", H2_EV_H2C_WAKE, h2c->conn);
3725 return t;
3726 }
Willy Tarreauea392822017-10-31 10:02:25 +01003727
Willy Tarreaubd42e922020-06-30 11:19:23 +02003728 if (!h2c_may_expire(h2c)) {
3729 /* we do still have streams but all of them are idle, waiting
3730 * for the data layer, so we must not enforce the timeout here.
3731 */
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003732 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003733 t->expire = TICK_ETERNITY;
3734 return t;
3735 }
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003736
Willy Tarreaubd42e922020-06-30 11:19:23 +02003737 /* We're about to destroy the connection, so make sure nobody attempts
3738 * to steal it from us.
3739 */
Willy Tarreaubd42e922020-06-30 11:19:23 +02003740 if (h2c->conn->flags & CO_FL_LIST_MASK)
3741 MT_LIST_DEL(&h2c->conn->list);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003742
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003743 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreaubd42e922020-06-30 11:19:23 +02003744 }
Olivier Houchardcd4159f2020-03-10 18:39:42 +01003745
Olivier Houchard48ce6a32020-07-02 11:58:05 +02003746do_leave:
Olivier Houchard3f795f72019-04-17 22:51:06 +02003747 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003748
3749 if (!h2c) {
3750 /* resources were already deleted */
Willy Tarreau7838a792019-08-12 18:42:03 +02003751 TRACE_DEVEL("leaving (not more h2c)", H2_EV_H2C_WAKE);
Willy Tarreau0975f112018-03-29 15:22:59 +02003752 return NULL;
3753 }
3754
3755 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003756 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003757 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003758
Willy Tarreau662fafc2019-05-26 09:43:07 +02003759 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003760 /* don't even try to send a GOAWAY, the buffer is stuck */
3761 h2c->flags |= H2_CF_GOAWAY_FAILED;
3762 }
3763
3764 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003765 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003766 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3767 h2c->flags |= H2_CF_GOAWAY_FAILED;
3768
Willy Tarreau662fafc2019-05-26 09:43:07 +02003769 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003770 unsigned int released = 0;
3771 struct buffer *buf;
3772
3773 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3774 if (b_data(buf)) {
3775 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3776 if (!ret)
3777 break;
3778 b_del(buf, ret);
3779 if (b_data(buf))
3780 break;
3781 b_free(buf);
3782 released++;
3783 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003784 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003785
3786 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003787 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003788 }
Willy Tarreauea392822017-10-31 10:02:25 +01003789
Willy Tarreau4481e262019-10-31 15:36:30 +01003790 /* in any case this connection must not be considered idle anymore */
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003791 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003792 MT_LIST_DEL((struct mt_list *)&h2c->conn->list);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02003793 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Willy Tarreau4481e262019-10-31 15:36:30 +01003794
Willy Tarreau0975f112018-03-29 15:22:59 +02003795 /* either we can release everything now or it will be done later once
3796 * the last stream closes.
3797 */
3798 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003799 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003800
Willy Tarreau7838a792019-08-12 18:42:03 +02003801 TRACE_LEAVE(H2_EV_H2C_WAKE);
Willy Tarreauea392822017-10-31 10:02:25 +01003802 return NULL;
3803}
3804
3805
Willy Tarreau62f52692017-10-08 23:01:42 +02003806/*******************************************/
3807/* functions below are used by the streams */
3808/*******************************************/
3809
3810/*
3811 * Attach a new stream to a connection
3812 * (Used for outgoing connections)
3813 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003814static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003815{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003816 struct conn_stream *cs;
3817 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003818 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003819
Willy Tarreau7838a792019-08-12 18:42:03 +02003820 TRACE_ENTER(H2_EV_H2S_NEW, conn);
Christopher Faulet236c93b2020-07-02 09:19:54 +02003821 cs = cs_new(conn, conn->target);
Willy Tarreau7838a792019-08-12 18:42:03 +02003822 if (!cs) {
3823 TRACE_DEVEL("leaving on CS allocation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003824 return NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003825 }
Olivier Houchardf502aca2018-12-14 19:42:40 +01003826 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003827 if (!h2s) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003828 TRACE_DEVEL("leaving on stream creation failure", H2_EV_H2S_NEW|H2_EV_H2S_ERR, conn);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003829 cs_free(cs);
3830 return NULL;
3831 }
Willy Tarreau7838a792019-08-12 18:42:03 +02003832 TRACE_LEAVE(H2_EV_H2S_NEW, conn, h2s);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003833 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003834}
3835
Willy Tarreaufafd3982018-11-18 21:29:20 +01003836/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3837 * We have to scan because we may have some orphan streams. It might be
3838 * beneficial to scan backwards from the end to reduce the likeliness to find
3839 * orphans.
3840 */
3841static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3842{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003843 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003844 struct h2s *h2s;
3845 struct eb32_node *node;
3846
3847 node = eb32_first(&h2c->streams_by_id);
3848 while (node) {
3849 h2s = container_of(node, struct h2s, by_id);
3850 if (h2s->cs)
3851 return h2s->cs;
3852 node = eb32_next(node);
3853 }
3854 return NULL;
3855}
3856
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02003857static int h2_ctl(struct connection *conn, enum mux_ctl_type mux_ctl, void *output)
3858{
3859 int ret = 0;
3860 struct h2c *h2c = conn->ctx;
3861
3862 switch (mux_ctl) {
3863 case MUX_STATUS:
3864 /* Only consider the mux to be ready if we're done with
3865 * the preface and settings, and we had no error.
3866 */
3867 if (h2c->st0 >= H2_CS_FRAME_H && h2c->st0 < H2_CS_ERROR)
3868 ret |= MUX_STATUS_READY;
3869 return ret;
3870 default:
3871 return -1;
3872 }
3873}
3874
Willy Tarreau62f52692017-10-08 23:01:42 +02003875/*
Olivier Houchard060ed432018-11-06 16:32:42 +01003876 * Destroy the mux and the associated connection, if it is no longer used
3877 */
Christopher Faulet73c12072019-04-08 11:23:22 +02003878static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01003879{
Christopher Faulet73c12072019-04-08 11:23:22 +02003880 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01003881
Willy Tarreau7838a792019-08-12 18:42:03 +02003882 TRACE_ENTER(H2_EV_H2C_END, h2c->conn);
Christopher Faulet39a96ee2019-04-08 10:52:21 +02003883 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02003884 h2_release(h2c);
Willy Tarreau7838a792019-08-12 18:42:03 +02003885 TRACE_LEAVE(H2_EV_H2C_END);
Olivier Houchard060ed432018-11-06 16:32:42 +01003886}
3887
3888/*
Willy Tarreau62f52692017-10-08 23:01:42 +02003889 * Detach the stream from the connection and possibly release the connection.
3890 */
3891static void h2_detach(struct conn_stream *cs)
3892{
Willy Tarreau60935142017-10-16 18:11:19 +02003893 struct h2s *h2s = cs->ctx;
3894 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003895 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003896
Willy Tarreau7838a792019-08-12 18:42:03 +02003897 TRACE_ENTER(H2_EV_STRM_END, h2s ? h2s->h2c->conn : NULL, h2s);
3898
Willy Tarreau60935142017-10-16 18:11:19 +02003899 cs->ctx = NULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02003900 if (!h2s) {
3901 TRACE_LEAVE(H2_EV_STRM_END);
Willy Tarreau60935142017-10-16 18:11:19 +02003902 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003903 }
Willy Tarreau60935142017-10-16 18:11:19 +02003904
Willy Tarreaud9464162020-01-10 18:25:07 +01003905 /* there's no txbuf so we're certain not to be able to send anything */
3906 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02003907
Olivier Houchardf502aca2018-12-14 19:42:40 +01003908 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003909 h2c = h2s->h2c;
3910 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02003911 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01003912 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
3913 !h2_frt_has_too_many_cs(h2c)) {
3914 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02003915 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003916 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02003917 }
Willy Tarreau60935142017-10-16 18:11:19 +02003918
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003919 /* this stream may be blocked waiting for some data to leave (possibly
3920 * an ES or RST frame), so orphan it in this case.
3921 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02003922 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02003923 (h2c->st0 < H2_CS_ERROR) &&
Willy Tarreau5723f292020-01-10 15:16:57 +01003924 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) &&
Willy Tarreauf96508a2020-01-10 11:12:48 +01003925 ((h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)) || h2s->subs)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02003926 TRACE_DEVEL("leaving on stream blocked", H2_EV_STRM_END|H2_EV_H2S_BLK, h2c->conn, h2s);
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003927 return;
Willy Tarreau7838a792019-08-12 18:42:03 +02003928 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003929
Willy Tarreau45f752e2017-10-30 15:44:59 +01003930 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
3931 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
3932 /* unblock the connection if it was blocked on this
3933 * stream.
3934 */
3935 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
3936 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003937 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01003938 }
3939
Willy Tarreau71049cc2018-03-28 13:56:39 +02003940 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02003941
Christopher Faulet9b79a102019-07-15 11:22:56 +02003942 if (h2c->flags & H2_CF_IS_BACK) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003943 if (!(h2c->conn->flags &
3944 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02003945 if (h2c->conn->flags & CO_FL_PRIVATE) {
Christopher Faulet08016ab2020-07-01 16:10:06 +02003946 /* Add the connection in the session server list, if not already done */
3947 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
3948 h2c->conn->owner = NULL;
3949 if (eb_is_empty(&h2c->streams_by_id)) {
3950 h2c->conn->mux->destroy(h2c);
3951 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
3952 return;
Christopher Fauletc5579d12020-07-01 15:45:41 +02003953 }
3954 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02003955 if (eb_is_empty(&h2c->streams_by_id)) {
Christopher Fauletc5579d12020-07-01 15:45:41 +02003956 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0) {
3957 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
3958 TRACE_DEVEL("leaving without reusable idle connection", H2_EV_STRM_END);
Olivier Houchard351411f2018-12-27 17:20:54 +01003959 return;
3960 }
3961 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003962 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02003963 else {
3964 if (eb_is_empty(&h2c->streams_by_id)) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01003965 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn, 1)) {
Olivier Houchard2444aa52020-01-20 13:56:01 +01003966 /* The server doesn't want it, let's kill the connection right away */
3967 h2c->conn->mux->destroy(h2c);
3968 TRACE_DEVEL("leaving on error after killing outgoing connection", H2_EV_STRM_END|H2_EV_H2C_ERR);
3969 return;
3970 }
Olivier Houchard199d4fa2020-03-22 23:25:51 +01003971 /* At this point, the connection has been added to the
3972 * server idle list, so another thread may already have
3973 * hijacked it, so we can't do anything with it.
3974 */
Olivier Houchard2444aa52020-01-20 13:56:01 +01003975 TRACE_DEVEL("reusable idle connection", H2_EV_STRM_END);
3976 return;
Olivier Houchard8a786902018-12-15 16:05:40 +01003977
Olivier Houchard8a786902018-12-15 16:05:40 +01003978 }
Christopher Fauletc5579d12020-07-01 15:45:41 +02003979 else if (MT_LIST_ISEMPTY(&h2c->conn->list) &&
3980 h2_avail_streams(h2c->conn) > 0 && objt_server(h2c->conn->target)) {
3981 LIST_ADD(&__objt_server(h2c->conn->target)->available_conns[tid], mt_list_to_list(&h2c->conn->list));
3982 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003983 }
3984 }
3985 }
3986
Willy Tarreaue323f342018-03-28 13:51:45 +02003987 /* We don't want to close right now unless we're removing the
3988 * last stream, and either the connection is in error, or it
3989 * reached the ID already specified in a GOAWAY frame received
3990 * or sent (as seen by last_sid >= 0).
3991 */
Olivier Houchard7a977432019-03-21 15:47:13 +01003992 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02003993 /* no more stream will come, kill it now */
Willy Tarreau7838a792019-08-12 18:42:03 +02003994 TRACE_DEVEL("leaving and killing dead connection", H2_EV_STRM_END, h2c->conn);
Christopher Faulet73c12072019-04-08 11:23:22 +02003995 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02003996 }
3997 else if (h2c->task) {
Willy Tarreauc2ea47f2019-10-01 10:12:00 +02003998 if (h2c_may_expire(h2c))
3999 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
4000 else
4001 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau73481192019-06-07 08:20:46 +02004002 task_queue(h2c->task);
Willy Tarreau7838a792019-08-12 18:42:03 +02004003 TRACE_DEVEL("leaving, refreshing connection's timeout", H2_EV_STRM_END, h2c->conn);
Willy Tarreau60935142017-10-16 18:11:19 +02004004 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004005 else
4006 TRACE_DEVEL("leaving", H2_EV_STRM_END, h2c->conn);
Willy Tarreau62f52692017-10-08 23:01:42 +02004007}
4008
Willy Tarreau88bdba32019-05-13 18:17:53 +02004009/* Performs a synchronous or asynchronous shutr(). */
4010static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004011{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004012 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004013
Willy Tarreauf983d002019-05-14 10:40:21 +02004014 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004015 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004016
Willy Tarreau7838a792019-08-12 18:42:03 +02004017 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4018
Willy Tarreau18059042019-01-31 19:12:48 +01004019 /* a connstream may require us to immediately kill the whole connection
4020 * for example because of a "tcp-request content reject" rule that is
4021 * normally used to limit abuse. In this case we schedule a goaway to
4022 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01004023 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004024 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004025 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004026 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004027 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4028 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4029 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004030 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
4031 /* Nothing was never sent for this stream, so reset with
4032 * REFUSED_STREAM error to let the client retry the
4033 * request.
4034 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004035 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004036 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4037 }
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004038 else {
4039 /* a final response was already provided, we don't want this
4040 * stream anymore. This may happen when the server responds
4041 * before the end of an upload and closes quickly (redirect,
4042 * deny, ...)
4043 */
4044 h2s_error(h2s, H2_ERR_CANCEL);
4045 }
Willy Tarreau18059042019-01-31 19:12:48 +01004046
Willy Tarreau90c32322017-11-24 08:00:30 +01004047 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004048 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004049 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004050
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004051 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004052 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01004053 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004054 done:
4055 h2s->flags &= ~H2_SF_WANT_SHUTR;
Willy Tarreau7838a792019-08-12 18:42:03 +02004056 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004057 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004058add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004059 /* Let the handler know we want to shutr, and add ourselves to the
4060 * most relevant list if not yet done. h2_deferred_shut() will be
4061 * automatically called via the shut_tl tasklet when there's room
4062 * again.
4063 */
4064 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004065 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004066 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004067 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004068 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004069 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004070 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004071 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004072 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02004073}
4074
Willy Tarreau88bdba32019-05-13 18:17:53 +02004075/* Performs a synchronous or asynchronous shutw(). */
4076static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02004077{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004078 struct h2c *h2c = h2s->h2c;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004079
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004080 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004081 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004082
Willy Tarreau7838a792019-08-12 18:42:03 +02004083 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4084
Willy Tarreaucfba9d62019-08-06 10:30:58 +02004085 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01004086 /* we can cleanly close using an empty data frame only after headers */
4087
4088 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
4089 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004090 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01004091
4092 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01004093 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01004094 else
4095 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004096 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01004097 /* a connstream may require us to immediately kill the whole connection
4098 * for example because of a "tcp-request content reject" rule that is
4099 * normally used to limit abuse. In this case we schedule a goaway to
4100 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01004101 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004102 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01004103 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004104 TRACE_STATE("stream wants to kill the connection", H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau18059042019-01-31 19:12:48 +01004105 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
4106 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
4107 }
Christopher Faulet35757d32019-03-07 15:51:33 +01004108 else {
4109 /* Nothing was never sent for this stream, so reset with
4110 * REFUSED_STREAM error to let the client retry the
4111 * request.
4112 */
Willy Tarreau7838a792019-08-12 18:42:03 +02004113 TRACE_STATE("no headers sent yet, trying a retryable abort", H2_EV_STRM_SHUT, h2c->conn, h2s);
Christopher Faulet35757d32019-03-07 15:51:33 +01004114 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
4115 }
Willy Tarreau18059042019-01-31 19:12:48 +01004116
Willy Tarreau90c32322017-11-24 08:00:30 +01004117 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004118 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004119 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01004120
Willy Tarreau00dd0782018-03-01 16:31:34 +01004121 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01004122 }
4123
Willy Tarreau4f6516d2018-12-19 13:59:17 +01004124 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02004125 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau7838a792019-08-12 18:42:03 +02004126
4127 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
4128
Willy Tarreau88bdba32019-05-13 18:17:53 +02004129 done:
4130 h2s->flags &= ~H2_SF_WANT_SHUTW;
4131 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004132
4133 add_to_list:
Willy Tarreau5723f292020-01-10 15:16:57 +01004134 /* Let the handler know we want to shutw, and add ourselves to the
4135 * most relevant list if not yet done. h2_deferred_shut() will be
4136 * automatically called via the shut_tl tasklet when there's room
4137 * again.
4138 */
4139 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004140 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau5723f292020-01-10 15:16:57 +01004141 if (h2s->flags & H2_SF_BLK_MFCTL)
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004142 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
Willy Tarreau5723f292020-01-10 15:16:57 +01004143 else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02004144 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub2e290a2018-03-30 17:35:38 +02004145 }
Willy Tarreau7838a792019-08-12 18:42:03 +02004146 TRACE_LEAVE(H2_EV_STRM_SHUT, h2c->conn, h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02004147 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004148}
4149
Willy Tarreau5723f292020-01-10 15:16:57 +01004150/* This is the tasklet referenced in h2s->shut_tl, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004151 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
4152 * and prevented the last frame from being emitted.
4153 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004154static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
4155{
4156 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02004157 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004158
Willy Tarreau7838a792019-08-12 18:42:03 +02004159 TRACE_ENTER(H2_EV_STRM_SHUT, h2c->conn, h2s);
4160
Willy Tarreau5723f292020-01-10 15:16:57 +01004161 if (h2s->flags & H2_SF_NOTIFIED) {
4162 /* some data processing remains to be done first */
4163 goto end;
4164 }
4165
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004166 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004167 h2_do_shutw(h2s);
4168
Willy Tarreau2c249eb2019-05-13 18:06:17 +02004169 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02004170 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004171
Willy Tarreau88bdba32019-05-13 18:17:53 +02004172 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004173 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01004174 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01004175
Willy Tarreau88bdba32019-05-13 18:17:53 +02004176 if (!h2s->cs) {
4177 h2s_destroy(h2s);
4178 if (h2c_is_dead(h2c))
4179 h2_release(h2c);
4180 }
Olivier Houchard7a977432019-03-21 15:47:13 +01004181 }
Willy Tarreau5723f292020-01-10 15:16:57 +01004182 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004183 TRACE_LEAVE(H2_EV_STRM_SHUT);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004184 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02004185}
4186
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004187/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004188static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
4189{
4190 struct h2s *h2s = cs->ctx;
4191
Willy Tarreau7838a792019-08-12 18:42:03 +02004192 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004193 if (cs->flags & CS_FL_KILL_CONN)
4194 h2s->flags |= H2_SF_KILL_CONN;
4195
Willy Tarreau7838a792019-08-12 18:42:03 +02004196 if (mode)
4197 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004198
Willy Tarreau7838a792019-08-12 18:42:03 +02004199 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004200}
4201
Willy Tarreau749f5ca2019-03-21 19:19:36 +01004202/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004203static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
4204{
4205 struct h2s *h2s = cs->ctx;
4206
Willy Tarreau7838a792019-08-12 18:42:03 +02004207 TRACE_ENTER(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02004208 if (cs->flags & CS_FL_KILL_CONN)
4209 h2s->flags |= H2_SF_KILL_CONN;
4210
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004211 h2_do_shutw(h2s);
Willy Tarreau7838a792019-08-12 18:42:03 +02004212 TRACE_LEAVE(H2_EV_STRM_SHUT, h2s->h2c->conn, h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02004213}
4214
Christopher Faulet9b79a102019-07-15 11:22:56 +02004215/* Decode the payload of a HEADERS frame and produce the HTX request or response
4216 * depending on the connection's side. Returns a positive value on success, a
4217 * negative value on failure, or 0 if it couldn't proceed. May report connection
4218 * errors in h2c->errcode if the frame is non-decodable and the connection
4219 * unrecoverable. In absence of connection error when a failure is reported, the
4220 * caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01004221 *
4222 * The function may fold CONTINUATION frames into the initial HEADERS frame
4223 * by removing padding and next frame header, then moving the CONTINUATION
4224 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
4225 * leaving a hole between the main frame and the beginning of the next one.
4226 * The possibly remaining incomplete or next frame at the end may be moved
4227 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
4228 * HEADERS frames are unwrapped into a temporary buffer before decoding.
4229 *
4230 * A buffer at the beginning of processing may look like this :
4231 *
4232 * ,---.---------.-----.--------------.--------------.------.---.
4233 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
4234 * `---^---------^-----^--------------^--------------^------^---'
4235 * | | <-----> | |
4236 * area | dpl | wrap
4237 * |<--------------> |
4238 * | dfl |
4239 * |<-------------------------------------------------->|
4240 * head data
4241 *
4242 * Padding is automatically overwritten when folding, participating to the
4243 * hole size after dfl :
4244 *
4245 * ,---.------------------------.-----.--------------.------.---.
4246 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
4247 * `---^------------------------^-----^--------------^------^---'
4248 * | | <-----> | |
4249 * area | hole | wrap
4250 * |<-----------------------> |
4251 * | dfl |
4252 * |<-------------------------------------------------->|
4253 * head data
4254 *
4255 * Please note that the HEADERS frame is always deprived from its PADLEN byte
4256 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
4257 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004258 *
4259 * The <flags> field must point to either the stream's flags or to a copy of it
4260 * so that the function can update the following flags :
4261 * - H2_SF_DATA_CLEN when content-length is seen
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004262 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01004263 *
4264 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
4265 * decoding, in order to detect if we're dealing with a headers or a trailers
4266 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02004267 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01004268static 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 +02004269{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004270 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02004271 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004272 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02004273 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02004274 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004275 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01004276 int flen; // header frame len
4277 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01004278 int ret = 0;
4279 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02004280 int wrap;
Willy Tarreau13278b42017-10-13 19:23:14 +02004281
Willy Tarreau7838a792019-08-12 18:42:03 +02004282 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
4283
Willy Tarreauea18f862018-12-22 20:19:26 +01004284next_frame:
4285 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
4286 goto leave; // incomplete input frame
4287
4288 /* No END_HEADERS means there's one or more CONTINUATION frames. In
4289 * this case, we'll try to paste it immediately after the initial
4290 * HEADERS frame payload and kill any possible padding. The initial
4291 * frame's length will be increased to represent the concatenation
4292 * of the two frames. The next frame is read from position <tlen>
4293 * and written at position <flen> (minus padding if some is present).
4294 */
4295 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
4296 struct h2_fh hdr;
4297 int clen; // CONTINUATION frame's payload length
4298
Willy Tarreau7838a792019-08-12 18:42:03 +02004299 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 +01004300 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
4301 /* no more data, the buffer may be full, either due to
4302 * too large a frame or because of too large a hole that
4303 * we're going to compact at the end.
4304 */
4305 goto leave;
4306 }
4307
4308 if (hdr.ft != H2_FT_CONTINUATION) {
4309 /* RFC7540#6.10: frame of unexpected type */
Willy Tarreau7838a792019-08-12 18:42:03 +02004310 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 +01004311 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4312 goto fail;
4313 }
4314
4315 if (hdr.sid != h2c->dsi) {
4316 /* RFC7540#6.10: frame of different stream */
Willy Tarreau7838a792019-08-12 18:42:03 +02004317 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 +01004318 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4319 goto fail;
4320 }
4321
4322 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
4323 /* RFC7540#4.2: invalid frame length */
Willy Tarreau7838a792019-08-12 18:42:03 +02004324 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 +01004325 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4326 goto fail;
4327 }
4328
4329 /* detect when we must stop aggragating frames */
4330 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
4331
4332 /* Take as much as we can of the CONTINUATION frame's payload */
4333 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
4334 if (clen > hdr.len)
4335 clen = hdr.len;
4336
4337 /* Move the frame's payload over the padding, hole and frame
4338 * header. At least one of hole or dpl is null (see diagrams
4339 * above). The hole moves after the new aggragated frame.
4340 */
4341 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
4342 h2c->dfl += clen - h2c->dpl;
4343 hole += h2c->dpl + 9;
4344 h2c->dpl = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004345 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 +01004346 goto next_frame;
4347 }
4348
4349 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01004350
Willy Tarreau13278b42017-10-13 19:23:14 +02004351 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004352 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02004353 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02004354 copy = alloc_trash_chunk();
4355 if (!copy) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004356 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 +02004357 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
4358 goto fail;
4359 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004360 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
4361 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
4362 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02004363 }
4364
Willy Tarreau13278b42017-10-13 19:23:14 +02004365 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
4366 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004367 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004368 /* RFC7540#5.3.1 : stream dep may not depend on itself */
Willy Tarreau7838a792019-08-12 18:42:03 +02004369 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 +01004370 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02004371 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01004372 }
4373
Willy Tarreaua01f45e2018-12-31 07:41:24 +01004374 if (flen < 5) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004375 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 +01004376 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
4377 goto fail;
4378 }
4379
Willy Tarreau13278b42017-10-13 19:23:14 +02004380 hdrs += 5; // stream dep = 4, weight = 1
4381 flen -= 5;
4382 }
4383
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004384 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004385 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 +01004386 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01004387 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004388 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004389
Willy Tarreau937f7602018-02-26 15:22:17 +01004390 /* we can't retry a failed decompression operation so we must be very
4391 * careful not to take any risks. In practice the output buffer is
4392 * always empty except maybe for trailers, in which case we simply have
4393 * to wait for the upper layer to finish consuming what is available.
4394 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004395 htx = htx_from_buf(rxbuf);
4396 if (!htx_is_empty(htx)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004397 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 +02004398 h2c->flags |= H2_CF_DEM_SFULL;
4399 goto leave;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004400 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004401
Willy Tarreau25919232019-01-03 14:48:18 +01004402 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004403 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
4404 sizeof(list)/sizeof(list[0]), tmp);
4405 if (outlen < 0) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004406 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 +01004407 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
4408 goto fail;
4409 }
4410
Willy Tarreau25919232019-01-03 14:48:18 +01004411 /* The PACK decompressor was updated, let's update the input buffer and
4412 * the parser's state to commit these changes and allow us to later
4413 * fail solely on the stream if needed.
4414 */
4415 b_del(&h2c->dbuf, h2c->dfl + hole);
4416 h2c->dfl = hole = 0;
4417 h2c->st0 = H2_CS_FRAME_H;
4418
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004419 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01004420 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01004421
Willy Tarreau88d138e2019-01-02 19:38:14 +01004422 if (*flags & H2_SF_HEADERS_RCVD)
4423 goto trailers;
4424
4425 /* This is the first HEADERS frame so it's a headers block */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004426 if (h2c->flags & H2_CF_IS_BACK)
4427 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
4428 else
4429 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreau59a10fb2017-11-21 20:03:02 +01004430
4431 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01004432 /* too large headers? this is a stream error only */
Willy Tarreau7838a792019-08-12 18:42:03 +02004433 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 +01004434 goto fail;
4435 }
Willy Tarreau13278b42017-10-13 19:23:14 +02004436
Willy Tarreau174b06a2018-04-25 18:13:58 +02004437 if (msgf & H2_MSGF_BODY) {
4438 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004439 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004440 *flags |= H2_SF_DATA_CLEN;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004441 htx->extra = *body_len;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01004442 }
Willy Tarreau174b06a2018-04-25 18:13:58 +02004443 }
4444
Willy Tarreau88d138e2019-01-02 19:38:14 +01004445 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01004446 /* indicate that a HEADERS frame was received for this stream, except
4447 * for 1xx responses. For 1xx responses, another HEADERS frame is
4448 * expected.
4449 */
4450 if (!(msgf & H2_MSGF_RSP_1XX))
4451 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01004452
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02004453 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Christopher Faulet9b79a102019-07-15 11:22:56 +02004454 /* Mark the end of message using EOM */
Christopher Faulet810df062020-07-22 16:20:34 +02004455 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Willy Tarreau7838a792019-08-12 18:42:03 +02004456 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
4457 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 +02004458 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004459 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004460 }
Willy Tarreau937f7602018-02-26 15:22:17 +01004461
Willy Tarreau86277d42019-01-02 15:36:11 +01004462 /* success */
4463 ret = 1;
4464
Willy Tarreau68dd9852017-07-03 14:44:26 +02004465 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01004466 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01004467 * move the remaining data over it.
4468 */
4469 if (hole) {
4470 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
4471 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
4472 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
4473 b_sub(&h2c->dbuf, hole);
4474 }
4475
Willy Tarreau97215ca2019-04-29 10:20:21 +02004476 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01004477 /* too large frames */
4478 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01004479 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01004480 }
4481
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004482 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01004483 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02004484 free_trash_chunk(copy);
Willy Tarreau7838a792019-08-12 18:42:03 +02004485 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_HDR, h2c->conn);
Willy Tarreau86277d42019-01-02 15:36:11 +01004486 return ret;
4487
Willy Tarreau68dd9852017-07-03 14:44:26 +02004488 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01004489 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02004490 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01004491
4492 trailers:
4493 /* This is the last HEADERS frame hence a trailer */
Willy Tarreau88d138e2019-01-02 19:38:14 +01004494 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
4495 /* It's a trailer but it's missing ES flag */
Willy Tarreau7838a792019-08-12 18:42:03 +02004496 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 +01004497 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
4498 goto fail;
4499 }
4500
Christopher Faulet9b79a102019-07-15 11:22:56 +02004501 /* Trailers terminate a DATA sequence */
Willy Tarreau7838a792019-08-12 18:42:03 +02004502 if (h2_make_htx_trailers(list, htx) <= 0) {
4503 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 +02004504 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004505 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01004506 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02004507}
4508
Christopher Faulet9b79a102019-07-15 11:22:56 +02004509/* Transfer the payload of a DATA frame to the HTTP/1 side. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004510 * parser state is automatically updated. Returns > 0 if it could completely
4511 * send the current frame, 0 if it couldn't complete, in which case
4512 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
4513 * DATA frame can return 0 as a valid result). Stream errors are reported in
4514 * h2s->errcode and connection errors in h2c->errcode. The caller must already
4515 * have checked the frame header and ensured that the frame was complete or the
4516 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02004517 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01004518static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02004519{
4520 struct h2c *h2c = h2s->h2c;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004521 int block;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004522 unsigned int flen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004523 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004524 struct buffer *csbuf;
Christopher Faulet9b79a102019-07-15 11:22:56 +02004525 unsigned int sent;
Willy Tarreau454f9052017-10-26 19:40:35 +02004526
Willy Tarreau7838a792019-08-12 18:42:03 +02004527 TRACE_ENTER(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
4528
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004529 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02004530
Olivier Houchard638b7992018-08-16 15:41:52 +02004531 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004532 if (!csbuf) {
4533 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau7838a792019-08-12 18:42:03 +02004534 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 +01004535 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004536 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004537 htx = htx_from_buf(csbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01004538
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004539try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004540 flen = h2c->dfl - h2c->dpl;
4541 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01004542 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004543
Willy Tarreauc9fa0482018-07-10 17:43:27 +02004544 if (flen > b_data(&h2c->dbuf)) {
4545 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004546 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01004547 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01004548 }
4549
Christopher Faulet9b79a102019-07-15 11:22:56 +02004550 block = htx_free_data_space(htx);
4551 if (!block) {
4552 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004553 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 +02004554 goto fail;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004555 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02004556 if (flen > block)
4557 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004558
Christopher Faulet9b79a102019-07-15 11:22:56 +02004559 /* here, flen is the max we can copy into the output buffer */
4560 block = b_contig_data(&h2c->dbuf, 0);
4561 if (flen > block)
4562 flen = block;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004563
Christopher Faulet9b79a102019-07-15 11:22:56 +02004564 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau022e5e52020-09-10 09:33:15 +02004565 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 +02004566
Christopher Faulet9b79a102019-07-15 11:22:56 +02004567 b_del(&h2c->dbuf, sent);
4568 h2c->dfl -= sent;
4569 h2c->rcvd_c += sent;
4570 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau454f9052017-10-26 19:40:35 +02004571
Christopher Faulet9b79a102019-07-15 11:22:56 +02004572 if (h2s->flags & H2_SF_DATA_CLEN) {
4573 h2s->body_len -= sent;
4574 htx->extra = h2s->body_len;
Willy Tarreaueba10f22018-04-25 20:44:22 +02004575 }
4576
Christopher Faulet9b79a102019-07-15 11:22:56 +02004577 if (sent < flen) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01004578 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau7838a792019-08-12 18:42:03 +02004579 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 +01004580 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004581 }
4582
Christopher Faulet9b79a102019-07-15 11:22:56 +02004583 goto try_again;
4584
Willy Tarreau4a28da12018-01-04 14:41:00 +01004585 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01004586 /* here we're done with the frame, all the payload (except padding) was
4587 * transferred.
4588 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02004589
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004590 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Faulet810df062020-07-22 16:20:34 +02004591 htx->flags |= HTX_FL_EOI; /* no more data are expected. Only EOM remains to add now */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004592 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004593 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 +02004594 h2c->flags |= H2_CF_DEM_SFULL;
4595 goto fail;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004596 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02004597 }
4598
Willy Tarreaud1023bb2018-03-22 16:53:12 +01004599 h2c->rcvd_c += h2c->dpl;
4600 h2c->rcvd_s += h2c->dpl;
4601 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004602 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet9b79a102019-07-15 11:22:56 +02004603 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004604 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01004605 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01004606 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004607 if (htx)
4608 htx_to_buf(htx, csbuf);
Willy Tarreau7838a792019-08-12 18:42:03 +02004609 TRACE_LEAVE(H2_EV_RX_FRAME|H2_EV_RX_DATA, h2c->conn, h2s);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004610 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004611}
4612
Willy Tarreau115e83b2018-12-01 19:17:53 +01004613/* Try to send a HEADERS frame matching HTX response present in HTX message
4614 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4615 * must check the stream's status to detect any error which might have happened
4616 * subsequently to a successful send. The htx blocks are automatically removed
4617 * from the message. The htx message is assumed to be valid since produced from
4618 * the internal code, hence it contains a start line, an optional series of
4619 * header blocks and an end of header, otherwise an invalid frame could be
4620 * emitted and the resulting htx message could be left in an inconsistent state.
4621 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004622static size_t h2s_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004623{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004624 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004625 struct h2c *h2c = h2s->h2c;
4626 struct htx_blk *blk;
4627 struct htx_blk *blk_end;
4628 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004629 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004630 struct htx_sl *sl;
4631 enum htx_blk_type type;
4632 int es_now = 0;
4633 int ret = 0;
4634 int hdr;
4635 int idx;
4636
Willy Tarreau7838a792019-08-12 18:42:03 +02004637 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4638
Willy Tarreau115e83b2018-12-01 19:17:53 +01004639 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004640 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004641 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004642 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004643 return 0;
4644 }
4645
Willy Tarreau115e83b2018-12-01 19:17:53 +01004646 /* determine the first block which must not be deleted, blk_end may
4647 * be NULL if all blocks have to be deleted.
4648 */
4649 idx = htx_get_head(htx);
4650 blk_end = NULL;
4651 while (idx != -1) {
4652 type = htx_get_blk_type(htx_get_blk(htx, idx));
4653 idx = htx_get_next(htx, idx);
4654 if (type == HTX_BLK_EOH) {
4655 if (idx != -1)
4656 blk_end = htx_get_blk(htx, idx);
4657 break;
4658 }
4659 }
4660
4661 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004662 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004663 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_RES_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004664 ALREADY_CHECKED(blk);
4665 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004666 h2s->status = sl->info.res.status;
Willy Tarreau7838a792019-08-12 18:42:03 +02004667 if (h2s->status < 100 || h2s->status > 999) {
4668 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 +01004669 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004670 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004671
4672 /* and the rest of the headers, that we dump starting at header 0 */
4673 hdr = 0;
4674
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004675 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004676 while ((idx = htx_get_next(htx, idx)) != -1) {
4677 blk = htx_get_blk(htx, idx);
4678 type = htx_get_blk_type(blk);
4679
4680 if (type == HTX_BLK_UNUSED)
4681 continue;
4682
4683 if (type != HTX_BLK_HDR)
4684 break;
4685
Willy Tarreau7838a792019-08-12 18:42:03 +02004686 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4687 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 +01004688 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004689 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004690
4691 list[hdr].n = htx_get_blk_name(htx, blk);
4692 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004693 hdr++;
4694 }
4695
4696 /* marker for end of headers */
4697 list[hdr].n = ist("");
4698
4699 if (h2s->status == 204 || h2s->status == 304) {
4700 /* no contents, claim c-len is present and set to zero */
4701 es_now = 1;
4702 }
4703
Willy Tarreau9c218e72019-05-26 10:08:28 +02004704 mbuf = br_tail(h2c->mbuf);
4705 retry:
4706 if (!h2_get_buf(h2c, mbuf)) {
4707 h2c->flags |= H2_CF_MUX_MALLOC;
4708 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004709 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 +02004710 return 0;
4711 }
4712
Willy Tarreau115e83b2018-12-01 19:17:53 +01004713 chunk_reset(&outbuf);
4714
4715 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004716 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4717 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004718 break;
4719 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004720 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004721 }
4722
4723 if (outbuf.size < 9)
4724 goto full;
4725
4726 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4727 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4728 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4729 outbuf.data = 9;
4730
4731 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004732 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004733 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004734 goto realign_again;
4735 goto full;
4736 }
4737
4738 /* encode all headers, stop at empty name */
4739 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4740 /* these ones do not exist in H2 and must be dropped. */
4741 if (isteq(list[hdr].n, ist("connection")) ||
4742 isteq(list[hdr].n, ist("proxy-connection")) ||
4743 isteq(list[hdr].n, ist("keep-alive")) ||
4744 isteq(list[hdr].n, ist("upgrade")) ||
4745 isteq(list[hdr].n, ist("transfer-encoding")))
4746 continue;
4747
Christopher Faulet86d144c2019-08-14 16:32:25 +02004748 /* Skip all pseudo-headers */
4749 if (*(list[hdr].n.ptr) == ':')
4750 continue;
4751
Willy Tarreau115e83b2018-12-01 19:17:53 +01004752 if (isteq(list[hdr].n, ist("")))
4753 break; // end
4754
4755 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4756 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004757 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004758 goto realign_again;
4759 goto full;
4760 }
4761 }
4762
Willy Tarreaucb985a42019-10-07 16:56:34 +02004763 /* update the frame's size */
4764 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4765
4766 if (outbuf.data > h2c->mfs + 9) {
4767 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
4768 /* output full */
4769 if (b_space_wraps(mbuf))
4770 goto realign_again;
4771 goto full;
4772 }
4773 }
4774
Christopher Faulet0b465482019-02-19 15:14:23 +01004775 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004776 * FIXME: we should also set it when we know for sure that the
4777 * content-length is zero as well as on 204/304
4778 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004779 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4780 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004781 es_now = 1;
4782
Willy Tarreau927b88b2019-03-04 08:03:25 +01004783 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004784 es_now = 1;
4785
Willy Tarreau115e83b2018-12-01 19:17:53 +01004786 if (es_now)
4787 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4788
4789 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02004790 TRACE_USER("sent H2 response", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02004791 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004792
4793 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4794 * 1xx responses, another HEADERS frame is expected.
4795 */
4796 if (h2s->status >= 200 || h2s->status == 101)
4797 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004798
Willy Tarreau115e83b2018-12-01 19:17:53 +01004799 if (es_now) {
4800 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02004801 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 +01004802 if (h2s->st == H2_SS_OPEN)
4803 h2s->st = H2_SS_HLOC;
4804 else
4805 h2s_close(h2s);
4806 }
4807
4808 /* OK we could properly deliver the response */
4809
4810 /* remove all header blocks including the EOH and compute the
4811 * corresponding size.
4812 *
4813 * FIXME: We should remove everything when es_now is set.
4814 */
4815 ret = 0;
4816 idx = htx_get_head(htx);
4817 blk = htx_get_blk(htx, idx);
4818 while (blk != blk_end) {
4819 ret += htx_get_blksz(blk);
4820 blk = htx_remove_blk(htx, blk);
4821 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004822
Christopher Faulet316934d2019-05-15 14:22:48 +02004823 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4824 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004825 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004826 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004827 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02004828 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004829 return ret;
4830 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004831 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4832 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004833 h2c->flags |= H2_CF_MUX_MFULL;
4834 h2s->flags |= H2_SF_BLK_MROOM;
4835 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02004836 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 +01004837 goto end;
4838 fail:
4839 /* unparsable HTX messages, too large ones to be produced in the local
4840 * list etc go here (unrecoverable errors).
4841 */
4842 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4843 ret = 0;
4844 goto end;
4845}
4846
Willy Tarreau80739692018-10-05 11:35:57 +02004847/* Try to send a HEADERS frame matching HTX request present in HTX message
4848 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4849 * must check the stream's status to detect any error which might have happened
4850 * subsequently to a successful send. The htx blocks are automatically removed
4851 * from the message. The htx message is assumed to be valid since produced from
4852 * the internal code, hence it contains a start line, an optional series of
4853 * header blocks and an end of header, otherwise an invalid frame could be
4854 * emitted and the resulting htx message could be left in an inconsistent state.
4855 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02004856static size_t h2s_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
Willy Tarreau80739692018-10-05 11:35:57 +02004857{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004858 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02004859 struct h2c *h2c = h2s->h2c;
4860 struct htx_blk *blk;
4861 struct htx_blk *blk_end;
4862 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004863 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02004864 struct htx_sl *sl;
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004865 struct ist meth, uri, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02004866 enum htx_blk_type type;
4867 int es_now = 0;
4868 int ret = 0;
4869 int hdr;
4870 int idx;
4871
Willy Tarreau7838a792019-08-12 18:42:03 +02004872 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
4873
Willy Tarreau80739692018-10-05 11:35:57 +02004874 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02004875 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004876 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02004877 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau80739692018-10-05 11:35:57 +02004878 return 0;
4879 }
4880
Willy Tarreau80739692018-10-05 11:35:57 +02004881 /* determine the first block which must not be deleted, blk_end may
4882 * be NULL if all blocks have to be deleted.
4883 */
4884 idx = htx_get_head(htx);
4885 blk_end = NULL;
4886 while (idx != -1) {
4887 type = htx_get_blk_type(htx_get_blk(htx, idx));
4888 idx = htx_get_next(htx, idx);
4889 if (type == HTX_BLK_EOH) {
4890 if (idx != -1)
4891 blk_end = htx_get_blk(htx, idx);
4892 break;
4893 }
4894 }
4895
4896 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004897 blk = htx_get_head_blk(htx);
Christopher Fauletea009732019-11-18 15:50:25 +01004898 BUG_ON(!blk || htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004899 ALREADY_CHECKED(blk);
4900 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004901 meth = htx_sl_req_meth(sl);
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004902 uri = htx_sl_req_uri(sl);
4903 if (unlikely(uri.len == 0)) {
4904 TRACE_PROTO("no URI in HTX request", H2_EV_TX_FRAME|H2_EV_TX_HDR|H2_EV_H2S_ERR, h2c->conn, h2s);
4905 goto fail;
4906 }
Willy Tarreau80739692018-10-05 11:35:57 +02004907
4908 /* and the rest of the headers, that we dump starting at header 0 */
4909 hdr = 0;
4910
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004911 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02004912 while ((idx = htx_get_next(htx, idx)) != -1) {
4913 blk = htx_get_blk(htx, idx);
4914 type = htx_get_blk_type(blk);
4915
4916 if (type == HTX_BLK_UNUSED)
4917 continue;
4918
4919 if (type != HTX_BLK_HDR)
4920 break;
4921
Willy Tarreau7838a792019-08-12 18:42:03 +02004922 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
4923 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 +02004924 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02004925 }
Willy Tarreau80739692018-10-05 11:35:57 +02004926
4927 list[hdr].n = htx_get_blk_name(htx, blk);
4928 list[hdr].v = htx_get_blk_value(htx, blk);
Christopher Faulet67d58092019-10-02 10:51:38 +02004929
4930 /* Skip header if same name is used to add the server name */
4931 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name &&
4932 isteq(list[hdr].n, ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len)))
4933 continue;
4934
Willy Tarreau80739692018-10-05 11:35:57 +02004935 hdr++;
4936 }
4937
Christopher Faulet72ba6cd2019-09-24 16:20:05 +02004938 /* Now add the server name to a header (if requested) */
4939 if ((h2c->flags & H2_CF_IS_BACK) && h2c->proxy->server_id_hdr_name) {
4940 struct server *srv = objt_server(h2c->conn->target);
4941
4942 if (srv) {
4943 list[hdr].n = ist2(h2c->proxy->server_id_hdr_name, h2c->proxy->server_id_hdr_len);
4944 list[hdr].v = ist(srv->id);
4945 hdr++;
4946 }
4947 }
4948
Willy Tarreau80739692018-10-05 11:35:57 +02004949 /* marker for end of headers */
4950 list[hdr].n = ist("");
4951
Willy Tarreau9c218e72019-05-26 10:08:28 +02004952 mbuf = br_tail(h2c->mbuf);
4953 retry:
4954 if (!h2_get_buf(h2c, mbuf)) {
4955 h2c->flags |= H2_CF_MUX_MALLOC;
4956 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02004957 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 +02004958 return 0;
4959 }
4960
Willy Tarreau80739692018-10-05 11:35:57 +02004961 chunk_reset(&outbuf);
4962
4963 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004964 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4965 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004966 break;
4967 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004968 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02004969 }
4970
4971 if (outbuf.size < 9)
4972 goto full;
4973
4974 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4975 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4976 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4977 outbuf.data = 9;
4978
4979 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01004980 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004981 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004982 goto realign_again;
4983 goto full;
4984 }
4985
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004986 auth = ist(NULL);
4987
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004988 /* RFC7540 #8.3: the CONNECT method must have :
4989 * - :authority set to the URI part (host:port)
4990 * - :method set to CONNECT
4991 * - :scheme and :path omitted
4992 */
Willy Tarreaub8ce8902019-10-08 18:16:18 +02004993 if (unlikely(sl->info.req.meth == HTTP_METH_CONNECT)) {
4994 auth = uri;
4995
4996 if (!hpack_encode_header(&outbuf, ist(":authority"), auth)) {
4997 /* output full */
4998 if (b_space_wraps(mbuf))
4999 goto realign_again;
5000 goto full;
5001 }
5002 } else {
5003 /* other methods need a :scheme. If an authority is known from
5004 * the request line, it must be sent, otherwise only host is
5005 * sent. Host is never sent as the authority.
5006 */
5007 struct ist scheme = { };
Christopher Faulet3b44c542019-06-14 10:46:51 +02005008
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005009 if (uri.ptr[0] != '/' && uri.ptr[0] != '*') {
5010 /* the URI seems to start with a scheme */
5011 int len = 1;
5012
5013 while (len < uri.len && uri.ptr[len] != ':')
5014 len++;
5015
5016 if (len + 2 < uri.len && uri.ptr[len + 1] == '/' && uri.ptr[len + 2] == '/') {
5017 /* make the uri start at the authority now */
5018 scheme.ptr = uri.ptr;
5019 scheme.len = len,
5020 uri.ptr += len + 3;
5021 uri.len -= len + 3;
5022
5023 /* find the auth part of the URI */
5024 auth.ptr = uri.ptr;
5025 auth.len = 0;
5026 while (auth.len < uri.len && auth.ptr[auth.len] != '/')
5027 auth.len++;
5028
5029 uri.ptr += auth.len;
5030 uri.len -= auth.len;
5031 }
5032 }
5033
5034 if (!scheme.len) {
5035 /* no explicit scheme, we're using an origin-form URI,
5036 * probably from an H1 request transcoded to H2 via an
5037 * external layer, then received as H2 without authority.
5038 * So we have to look up the scheme from the HTX flags.
5039 * In such a case only http and https are possible, and
5040 * https is the default (sent by browsers).
5041 */
5042 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
5043 scheme = ist("http");
5044 else
5045 scheme = ist("https");
5046 }
Christopher Faulet3b44c542019-06-14 10:46:51 +02005047
5048 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005049 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005050 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005051 goto realign_again;
5052 goto full;
5053 }
Willy Tarreau80739692018-10-05 11:35:57 +02005054
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005055 if (auth.len && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005056 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005057 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01005058 goto realign_again;
5059 goto full;
5060 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005061
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005062 /* encode the path. RFC7540#8.1.2.3: if path is empty it must
5063 * be sent as '/' or '*'.
5064 */
5065 if (unlikely(!uri.len)) {
5066 if (sl->info.req.meth == HTTP_METH_OPTIONS)
5067 uri = ist("*");
5068 else
5069 uri = ist("/");
Willy Tarreau053c1572019-02-01 16:13:59 +01005070 }
Willy Tarreau053c1572019-02-01 16:13:59 +01005071
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005072 if (!hpack_encode_path(&outbuf, uri)) {
5073 /* output full */
5074 if (b_space_wraps(mbuf))
5075 goto realign_again;
5076 goto full;
5077 }
Willy Tarreau80739692018-10-05 11:35:57 +02005078 }
5079
Willy Tarreaub8ce8902019-10-08 18:16:18 +02005080 /* encode all headers, stop at empty name. Host is only sent if we
5081 * do not provide an authority.
5082 */
Willy Tarreau80739692018-10-05 11:35:57 +02005083 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005084 struct ist n = list[hdr].n;
5085 struct ist v = list[hdr].v;
5086
Willy Tarreau80739692018-10-05 11:35:57 +02005087 /* these ones do not exist in H2 and must be dropped. */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005088 if (isteq(n, ist("connection")) ||
5089 (auth.len && isteq(n, ist("host"))) ||
5090 isteq(n, ist("proxy-connection")) ||
5091 isteq(n, ist("keep-alive")) ||
5092 isteq(n, ist("upgrade")) ||
5093 isteq(n, ist("transfer-encoding")))
Willy Tarreau80739692018-10-05 11:35:57 +02005094 continue;
5095
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005096 if (isteq(n, ist("te"))) {
5097 /* "te" may only be sent with "trailers" if this value
5098 * is present, otherwise it must be deleted.
5099 */
5100 v = istist(v, ist("trailers"));
5101 if (!v.ptr || (v.len > 8 && v.ptr[8] != ','))
5102 continue;
5103 v = ist("trailers");
5104 }
5105
Christopher Faulet86d144c2019-08-14 16:32:25 +02005106 /* Skip all pseudo-headers */
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005107 if (*(n.ptr) == ':')
Christopher Faulet86d144c2019-08-14 16:32:25 +02005108 continue;
5109
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005110 if (isteq(n, ist("")))
Willy Tarreau80739692018-10-05 11:35:57 +02005111 break; // end
5112
Willy Tarreaubb2c4ae2020-01-24 09:07:53 +01005113 if (!hpack_encode_header(&outbuf, n, v)) {
Willy Tarreau80739692018-10-05 11:35:57 +02005114 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005115 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02005116 goto realign_again;
5117 goto full;
5118 }
5119 }
5120
Willy Tarreaucb985a42019-10-07 16:56:34 +02005121 /* update the frame's size */
5122 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5123
5124 if (outbuf.data > h2c->mfs + 9) {
5125 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5126 /* output full */
5127 if (b_space_wraps(mbuf))
5128 goto realign_again;
5129 goto full;
5130 }
5131 }
5132
Willy Tarreau80739692018-10-05 11:35:57 +02005133 /* we may need to add END_STREAM if we have no body :
5134 * - request already closed, or :
5135 * - no transfer-encoding, and :
5136 * - no content-length or content-length:0
5137 * Fixme: this doesn't take into account CONNECT requests.
5138 */
5139 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
5140 es_now = 1;
5141
5142 if (sl->flags & HTX_SL_F_BODYLESS)
5143 es_now = 1;
5144
Willy Tarreau927b88b2019-03-04 08:03:25 +01005145 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02005146 es_now = 1;
5147
Willy Tarreau80739692018-10-05 11:35:57 +02005148 if (es_now)
5149 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
5150
5151 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005152 TRACE_USER("sent H2 request", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s, htx);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005153 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02005154 h2s->flags |= H2_SF_HEADERS_SENT;
5155 h2s->st = H2_SS_OPEN;
5156
Willy Tarreau80739692018-10-05 11:35:57 +02005157 if (es_now) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005158 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 +02005159 // trim any possibly pending data (eg: inconsistent content-length)
5160 h2s->flags |= H2_SF_ES_SENT;
5161 h2s->st = H2_SS_HLOC;
5162 }
5163
5164 /* remove all header blocks including the EOH and compute the
5165 * corresponding size.
5166 *
5167 * FIXME: We should remove everything when es_now is set.
5168 */
5169 ret = 0;
5170 idx = htx_get_head(htx);
5171 blk = htx_get_blk(htx, idx);
5172 while (blk != blk_end) {
5173 ret += htx_get_blksz(blk);
5174 blk = htx_remove_blk(htx, blk);
5175 }
5176
Christopher Faulet316934d2019-05-15 14:22:48 +02005177 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5178 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02005179 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02005180 }
Willy Tarreau80739692018-10-05 11:35:57 +02005181
5182 end:
5183 return ret;
5184 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005185 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5186 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02005187 h2c->flags |= H2_CF_MUX_MFULL;
5188 h2s->flags |= H2_SF_BLK_MROOM;
5189 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005190 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 +02005191 goto end;
5192 fail:
5193 /* unparsable HTX messages, too large ones to be produced in the local
5194 * list etc go here (unrecoverable errors).
5195 */
5196 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5197 ret = 0;
5198 goto end;
5199}
5200
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005201/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01005202 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
5203 * caller must check the stream's status to detect any error which might have
5204 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02005205 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005206 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005207static size_t h2s_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005208{
5209 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005210 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005211 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005212 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005213 size_t total = 0;
5214 int es_now = 0;
5215 int bsize; /* htx block size */
5216 int fsize; /* h2 frame size */
5217 struct htx_blk *blk;
5218 enum htx_blk_type type;
5219 int idx;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005220 int trunc_out; /* non-zero if truncated on out buf */
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005221
Willy Tarreau7838a792019-08-12 18:42:03 +02005222 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
5223
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005224 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005225 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005226 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005227 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005228 goto end;
5229 }
5230
Willy Tarreau98de12a2018-12-12 07:03:00 +01005231 htx = htx_from_buf(buf);
5232
Christopher Faulet54b5e212019-06-04 10:08:28 +02005233 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
5234 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
5235 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005236 */
5237
5238 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01005239 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005240 goto end;
5241
5242 idx = htx_get_head(htx);
5243 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02005244 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005245 bsize = htx_get_blksz(blk);
5246 fsize = bsize;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005247 trunc_out = 0;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005248
Christopher Faulet54b5e212019-06-04 10:08:28 +02005249 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01005250 if (h2s->flags & H2_SF_ES_SENT) {
5251 /* ES already sent */
5252 htx_remove_blk(htx, blk);
5253 total++; // EOM counts as one byte
5254 count--;
5255 goto end;
5256 }
5257 }
5258 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005259 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005260
Willy Tarreau9c218e72019-05-26 10:08:28 +02005261 mbuf = br_tail(h2c->mbuf);
5262 retry:
5263 if (!h2_get_buf(h2c, mbuf)) {
5264 h2c->flags |= H2_CF_MUX_MALLOC;
5265 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005266 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 +02005267 goto end;
5268 }
5269
Willy Tarreau98de12a2018-12-12 07:03:00 +01005270 /* Perform some optimizations to reduce the number of buffer copies.
5271 * First, if the mux's buffer is empty and the htx area contains
5272 * exactly one data block of the same size as the requested count, and
5273 * this count fits within the frame size, the stream's window size, and
5274 * the connection's window size, then it's possible to simply swap the
5275 * caller's buffer with the mux's output buffer and adjust offsets and
5276 * length to match the entire DATA HTX block in the middle. In this
5277 * case we perform a true zero-copy operation from end-to-end. This is
5278 * the situation that happens all the time with large files. Second, if
5279 * this is not possible, but the mux's output buffer is empty, we still
5280 * have an opportunity to avoid the copy to the intermediary buffer, by
5281 * making the intermediary buffer's area point to the output buffer's
5282 * area. In this case we want to skip the HTX header to make sure that
5283 * copies remain aligned and that this operation remains possible all
5284 * the time. This goes for headers, data blocks and any data extracted
5285 * from the HTX blocks.
5286 */
5287 if (unlikely(fsize == count &&
Christopher Faulet192c6a22019-06-11 16:32:24 +02005288 htx_nbblks(htx) == 1 && type == HTX_BLK_DATA &&
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005289 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005290 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005291
Willy Tarreaubcc45952019-05-26 10:05:50 +02005292 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005293 /* Too bad there are data left there. We're willing to memcpy/memmove
5294 * up to 1/4 of the buffer, which means that it's OK to copy a large
5295 * frame into a buffer containing few data if it needs to be realigned,
5296 * and that it's also OK to copy few data without realigning. Otherwise
5297 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005298 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005299 if (fsize + 9 <= b_room(mbuf) &&
5300 (b_data(mbuf) <= b_size(mbuf) / 4 ||
Willy Tarreau7838a792019-08-12 18:42:03 +02005301 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf)))) {
5302 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 +01005303 goto copy;
Willy Tarreau7838a792019-08-12 18:42:03 +02005304 }
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005305
Willy Tarreau9c218e72019-05-26 10:08:28 +02005306 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5307 goto retry;
5308
Willy Tarreau98de12a2018-12-12 07:03:00 +01005309 h2c->flags |= H2_CF_MUX_MFULL;
5310 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005311 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 +01005312 goto end;
5313 }
5314
5315 /* map an H2 frame to the HTX block so that we can put the
5316 * frame header there.
5317 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005318 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5319 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005320
5321 /* prepend an H2 DATA frame header just before the DATA block */
5322 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5323 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5324 h2_set_frame_size(outbuf.area, fsize);
5325
5326 /* update windows */
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005327 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005328 h2c->mws -= fsize;
5329
5330 /* and exchange with our old area */
5331 buf->area = old_area;
5332 buf->data = buf->head = 0;
5333 total += fsize;
Willy Tarreau7838a792019-08-12 18:42:03 +02005334
5335 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 +01005336 goto end;
5337 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005338
Willy Tarreau98de12a2018-12-12 07:03:00 +01005339 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005340 /* for DATA and EOM we'll have to emit a frame, even if empty */
5341
5342 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005343 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5344 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005345 break;
5346 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005347 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005348 }
5349
5350 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005351 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5352 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005353 h2c->flags |= H2_CF_MUX_MFULL;
5354 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005355 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005356 goto end;
5357 }
5358
5359 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5360 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5361 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5362 outbuf.data = 9;
5363
5364 /* we have in <fsize> the exact number of bytes we need to copy from
5365 * the HTX buffer. We need to check this against the connection's and
5366 * the stream's send windows, and to ensure that this fits in the max
5367 * frame size and in the buffer's available space minus 9 bytes (for
5368 * the frame header). The connection's flow control is applied last so
5369 * that we can use a separate list of streams which are immediately
5370 * unblocked on window opening. Note: we don't implement padding.
5371 */
5372
5373 /* EOM is presented with bsize==1 but would lead to the emission of an
5374 * empty frame, thus we force it to zero here.
5375 */
5376 if (type == HTX_BLK_EOM)
5377 bsize = fsize = 0;
5378
5379 if (!fsize)
5380 goto send_empty;
5381
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005382 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005383 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005384 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005385 LIST_DEL_INIT(&h2s->list);
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005386 LIST_ADDQ(&h2c->blocked_list, &h2s->list);
Willy Tarreau7838a792019-08-12 18:42:03 +02005387 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 +01005388 goto end;
5389 }
5390
Willy Tarreauee573762018-12-04 15:25:57 +01005391 if (fsize > count)
5392 fsize = count;
5393
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005394 if (fsize > h2s_mws(h2s))
5395 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005396
5397 if (h2c->mfs && fsize > h2c->mfs)
5398 fsize = h2c->mfs; // >0
5399
5400 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005401 /* It doesn't fit at once. If it at least fits once split and
5402 * the amount of data to move is low, let's defragment the
5403 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005404 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005405 if (b_space_wraps(mbuf) &&
5406 (fsize + 9 <= b_room(mbuf)) &&
5407 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005408 goto realign_again;
5409 fsize = outbuf.size - 9;
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005410 trunc_out = 1;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005411
5412 if (fsize <= 0) {
5413 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005414 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5415 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005416 h2c->flags |= H2_CF_MUX_MFULL;
5417 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005418 TRACE_STATE("output buffer full", H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005419 goto end;
5420 }
5421 }
5422
5423 if (h2c->mws <= 0) {
5424 h2s->flags |= H2_SF_BLK_MFCTL;
Willy Tarreau7838a792019-08-12 18:42:03 +02005425 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 +01005426 goto end;
5427 }
5428
5429 if (fsize > h2c->mws)
5430 fsize = h2c->mws;
5431
5432 /* now let's copy this this into the output buffer */
5433 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau1d4a0f82019-08-02 07:52:08 +02005434 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005435 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005436 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005437
5438 send_empty:
5439 /* update the frame's size */
5440 h2_set_frame_size(outbuf.area, fsize);
5441
5442 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5443 * meeting EOM. We should optimize this later.
5444 */
5445 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005446 total++; // EOM counts as one byte
5447 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005448 es_now = 1;
5449 }
5450
5451 if (es_now)
5452 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5453
5454 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005455 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005456
5457 /* consume incoming HTX block, including EOM */
5458 total += fsize;
5459 if (fsize == bsize) {
5460 htx_remove_blk(htx, blk);
Willy Tarreau7838a792019-08-12 18:42:03 +02005461 if (fsize) {
5462 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 +01005463 goto new_frame;
Willy Tarreau7838a792019-08-12 18:42:03 +02005464 }
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005465 } else {
5466 /* we've truncated this block */
5467 htx_cut_data_blk(htx, blk, fsize);
Willy Tarreauc7ce4e32020-01-14 11:42:59 +01005468 if (trunc_out)
5469 goto new_frame;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005470 }
5471
5472 if (es_now) {
5473 if (h2s->st == H2_SS_OPEN)
5474 h2s->st = H2_SS_HLOC;
5475 else
5476 h2s_close(h2s);
5477
5478 h2s->flags |= H2_SF_ES_SENT;
Willy Tarreau7838a792019-08-12 18:42:03 +02005479 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 +01005480 }
5481
5482 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005483 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_DATA, h2c->conn, h2s);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005484 return total;
5485}
5486
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005487/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5488 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5489 * processed. The caller must check the stream's status to detect any error
5490 * which might have happened subsequently to a successful send. The htx blocks
5491 * are automatically removed from the message. The htx message is assumed to be
5492 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005493 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005494 * as a single frame. The ES flag is always set.
5495 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005496static size_t h2s_make_trailers(struct h2s *h2s, struct htx *htx)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005497{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005498 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005499 struct h2c *h2c = h2s->h2c;
5500 struct htx_blk *blk;
5501 struct htx_blk *blk_end;
5502 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005503 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005504 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005505 int ret = 0;
5506 int hdr;
5507 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005508
Willy Tarreau7838a792019-08-12 18:42:03 +02005509 TRACE_ENTER(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
5510
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005511 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005512 TRACE_STATE("mux output busy", H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005513 h2s->flags |= H2_SF_BLK_MBUSY;
Willy Tarreau7838a792019-08-12 18:42:03 +02005514 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005515 goto end;
5516 }
5517
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005518 /* determine the first block which must not be deleted, blk_end may
5519 * be NULL if all blocks have to be deleted. also get trailers.
5520 */
5521 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005522 blk_end = NULL;
5523
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005524 hdr = 0;
5525 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005526 blk = htx_get_blk(htx, idx);
5527 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005528 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005529 if (type == HTX_BLK_UNUSED)
5530 continue;
5531
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005532 if (type == HTX_BLK_EOT) {
5533 if (idx != -1)
5534 blk_end = blk;
5535 break;
5536 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005537 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005538 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005539
Willy Tarreau7838a792019-08-12 18:42:03 +02005540 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1)) {
5541 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 +01005542 goto fail;
Willy Tarreau7838a792019-08-12 18:42:03 +02005543 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005544
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005545 list[hdr].n = htx_get_blk_name(htx, blk);
5546 list[hdr].v = htx_get_blk_value(htx, blk);
5547 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005548 }
5549
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005550 /* marker for end of trailers */
5551 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005552
Willy Tarreau9c218e72019-05-26 10:08:28 +02005553 mbuf = br_tail(h2c->mbuf);
5554 retry:
5555 if (!h2_get_buf(h2c, mbuf)) {
5556 h2c->flags |= H2_CF_MUX_MALLOC;
5557 h2s->flags |= H2_SF_BLK_MROOM;
Willy Tarreau7838a792019-08-12 18:42:03 +02005558 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 +02005559 goto end;
5560 }
5561
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005562 chunk_reset(&outbuf);
5563
5564 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005565 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5566 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005567 break;
5568 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005569 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005570 }
5571
5572 if (outbuf.size < 9)
5573 goto full;
5574
5575 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5576 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5577 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5578 outbuf.data = 9;
5579
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005580 /* encode all headers */
5581 for (idx = 0; idx < hdr; idx++) {
5582 /* these ones do not exist in H2 or must not appear in
5583 * trailers and must be dropped.
5584 */
5585 if (isteq(list[idx].n, ist("host")) ||
5586 isteq(list[idx].n, ist("content-length")) ||
5587 isteq(list[idx].n, ist("connection")) ||
5588 isteq(list[idx].n, ist("proxy-connection")) ||
5589 isteq(list[idx].n, ist("keep-alive")) ||
5590 isteq(list[idx].n, ist("upgrade")) ||
5591 isteq(list[idx].n, ist("te")) ||
5592 isteq(list[idx].n, ist("transfer-encoding")))
5593 continue;
5594
Christopher Faulet86d144c2019-08-14 16:32:25 +02005595 /* Skip all pseudo-headers */
5596 if (*(list[idx].n.ptr) == ':')
5597 continue;
5598
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005599 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5600 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005601 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005602 goto realign_again;
5603 goto full;
5604 }
5605 }
5606
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005607 if (outbuf.data == 9) {
5608 /* here we have a problem, we have nothing to emit (either we
5609 * received an empty trailers block followed or we removed its
5610 * contents above). Because of this we can't send a HEADERS
5611 * frame, so we have to cheat and instead send an empty DATA
5612 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005613 */
5614 outbuf.area[3] = H2_FT_DATA;
5615 outbuf.area[4] = H2_F_DATA_END_STREAM;
5616 }
5617
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005618 /* update the frame's size */
5619 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5620
Willy Tarreau572d9f52019-10-11 16:58:37 +02005621 if (outbuf.data > h2c->mfs + 9) {
5622 if (!h2_fragment_headers(&outbuf, h2c->mfs)) {
5623 /* output full */
5624 if (b_space_wraps(mbuf))
5625 goto realign_again;
5626 goto full;
5627 }
5628 }
5629
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005630 /* commit the H2 response */
Willy Tarreau7838a792019-08-12 18:42:03 +02005631 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 +02005632 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005633 h2s->flags |= H2_SF_ES_SENT;
5634
5635 if (h2s->st == H2_SS_OPEN)
5636 h2s->st = H2_SS_HLOC;
5637 else
5638 h2s_close(h2s);
5639
5640 /* OK we could properly deliver the response */
5641 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005642 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005643 ret = 0;
5644 idx = htx_get_head(htx);
5645 blk = htx_get_blk(htx, idx);
5646 while (blk != blk_end) {
5647 ret += htx_get_blksz(blk);
5648 blk = htx_remove_blk(htx, blk);
5649 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005650
5651 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5652 ret += htx_get_blksz(blk_end);
5653 htx_remove_blk(htx, blk_end);
5654 }
5655
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005656 end:
Willy Tarreau7838a792019-08-12 18:42:03 +02005657 TRACE_LEAVE(H2_EV_TX_FRAME|H2_EV_TX_HDR, h2c->conn, h2s);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005658 return ret;
5659 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005660 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5661 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005662 h2c->flags |= H2_CF_MUX_MFULL;
5663 h2s->flags |= H2_SF_BLK_MROOM;
5664 ret = 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005665 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 +01005666 goto end;
5667 fail:
5668 /* unparsable HTX messages, too large ones to be produced in the local
5669 * list etc go here (unrecoverable errors).
5670 */
5671 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5672 ret = 0;
5673 goto end;
5674}
5675
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005676/* Called from the upper layer, to subscribe <es> to events <event_type>. The
5677 * event subscriber <es> is not allowed to change from a previous call as long
5678 * as at least one event is still subscribed. The <event_type> must only be a
5679 * combination of SUB_RETRY_RECV and SUB_RETRY_SEND. It always returns 0.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005680 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005681static int h2_subscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard6ff20392018-07-17 18:46:31 +02005682{
Olivier Houchard6ff20392018-07-17 18:46:31 +02005683 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005684 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005685
Willy Tarreau7838a792019-08-12 18:42:03 +02005686 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005687
5688 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005689 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005690
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005691 es->events |= event_type;
5692 h2s->subs = es;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005693
5694 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005695 TRACE_DEVEL("subscribe(recv)", H2_EV_STRM_RECV, h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005696
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005697 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005698 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2c->conn, h2s);
Olivier Houchardf8338152019-05-14 17:50:32 +02005699 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5700 !LIST_ADDED(&h2s->list)) {
5701 if (h2s->flags & H2_SF_BLK_MFCTL)
5702 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5703 else
5704 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005705 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02005706 }
Willy Tarreau7838a792019-08-12 18:42:03 +02005707 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005708 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005709}
5710
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005711/* Called from the upper layer, to unsubscribe <es> from events <event_type>.
5712 * The <es> pointer is not allowed to differ from the one passed to the
5713 * subscribe() call. It always returns zero.
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005714 */
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005715static int h2_unsubscribe(struct conn_stream *cs, int event_type, struct wait_event *es)
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005716{
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005717 struct h2s *h2s = cs->ctx;
5718
Willy Tarreau7838a792019-08-12 18:42:03 +02005719 TRACE_ENTER(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005720
5721 BUG_ON(event_type & ~(SUB_RETRY_SEND|SUB_RETRY_RECV));
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005722 BUG_ON(h2s->subs && h2s->subs != es);
Willy Tarreauf96508a2020-01-10 11:12:48 +01005723
Willy Tarreauee1a6fc2020-01-17 07:52:13 +01005724 es->events &= ~event_type;
5725 if (!es->events)
Willy Tarreauf96508a2020-01-10 11:12:48 +01005726 h2s->subs = NULL;
5727
5728 if (event_type & SUB_RETRY_RECV)
Willy Tarreau7838a792019-08-12 18:42:03 +02005729 TRACE_DEVEL("unsubscribe(recv)", H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005730
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005731 if (event_type & SUB_RETRY_SEND) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005732 TRACE_DEVEL("subscribe(send)", H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreaud9464162020-01-10 18:25:07 +01005733 h2s->flags &= ~H2_SF_NOTIFIED;
Willy Tarreauf96508a2020-01-10 11:12:48 +01005734 if (!(h2s->flags & (H2_SF_WANT_SHUTR | H2_SF_WANT_SHUTW)))
5735 LIST_DEL_INIT(&h2s->list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005736 }
Willy Tarreauf96508a2020-01-10 11:12:48 +01005737
Willy Tarreau7838a792019-08-12 18:42:03 +02005738 TRACE_LEAVE(H2_EV_STRM_SEND|H2_EV_STRM_RECV, h2s->h2c->conn, h2s);
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005739 return 0;
5740}
5741
5742
Olivier Houchard511efea2018-08-16 15:30:32 +02005743/* Called from the upper layer, to receive data */
5744static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5745{
Olivier Houchard638b7992018-08-16 15:41:52 +02005746 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005747 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005748 struct htx *h2s_htx = NULL;
5749 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005750 size_t ret = 0;
5751
Willy Tarreau7838a792019-08-12 18:42:03 +02005752 TRACE_ENTER(H2_EV_STRM_RECV, h2c->conn, h2s);
5753
Olivier Houchard511efea2018-08-16 15:30:32 +02005754 /* transfer possibly pending data to the upper layer */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005755 h2s_htx = htx_from_buf(&h2s->rxbuf);
5756 if (htx_is_empty(h2s_htx)) {
5757 /* Here htx_to_buf() will set buffer data to 0 because
5758 * the HTX is empty.
5759 */
5760 htx_to_buf(h2s_htx, &h2s->rxbuf);
5761 goto end;
5762 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005763
Christopher Faulet9b79a102019-07-15 11:22:56 +02005764 ret = h2s_htx->data;
5765 buf_htx = htx_from_buf(buf);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005766
Christopher Faulet9b79a102019-07-15 11:22:56 +02005767 /* <buf> is empty and the message is small enough, swap the
5768 * buffers. */
5769 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005770 htx_to_buf(buf_htx, buf);
5771 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet9b79a102019-07-15 11:22:56 +02005772 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5773 goto end;
Willy Tarreau86724e22018-12-01 23:19:43 +01005774 }
Christopher Faulet9b79a102019-07-15 11:22:56 +02005775
5776 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
5777
5778 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
5779 buf_htx->flags |= HTX_FL_PARSING_ERROR;
5780 if (htx_is_empty(buf_htx))
5781 cs->flags |= CS_FL_EOI;
Willy Tarreau86724e22018-12-01 23:19:43 +01005782 }
Christopher Faulet810df062020-07-22 16:20:34 +02005783 else if (htx_is_empty(h2s_htx))
5784 buf_htx->flags |= (h2s_htx->flags & HTX_FL_EOI);
Olivier Houchard511efea2018-08-16 15:30:32 +02005785
Christopher Faulet9b79a102019-07-15 11:22:56 +02005786 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
5787 htx_to_buf(buf_htx, buf);
5788 htx_to_buf(h2s_htx, &h2s->rxbuf);
5789 ret -= h2s_htx->data;
5790
Christopher Faulet37070b22019-02-14 15:12:14 +01005791 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005792 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005793 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005794 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005795 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005796 if (h2s->flags & H2_SF_ES_RCVD)
5797 cs->flags |= CS_FL_EOI;
Willy Tarreau76c83822019-06-15 09:55:50 +02005798 if (conn_xprt_read0_pending(h2c->conn) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02005799 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005800 if (cs->flags & CS_FL_ERR_PENDING)
5801 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005802 if (b_size(&h2s->rxbuf)) {
5803 b_free(&h2s->rxbuf);
5804 offer_buffers(NULL, tasks_run_queue);
5805 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005806 }
5807
Willy Tarreau082f5592018-11-25 08:03:32 +01005808 if (ret && h2c->dsi == h2s->id) {
5809 /* demux is blocking on this stream's buffer */
5810 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005811 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005812 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005813
Willy Tarreau7838a792019-08-12 18:42:03 +02005814 TRACE_LEAVE(H2_EV_STRM_RECV, h2c->conn, h2s);
Olivier Houchard511efea2018-08-16 15:30:32 +02005815 return ret;
5816}
5817
Olivier Houchardd846c262018-10-19 17:24:29 +02005818
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005819/* Called from the upper layer, to send data from buffer <buf> for no more than
5820 * <count> bytes. Returns the number of bytes effectively sent. Some status
5821 * flags may be updated on the conn_stream.
5822 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005823static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005824{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005825 struct h2s *h2s = cs->ctx;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005826 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005827 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005828 struct htx *htx;
5829 struct htx_blk *blk;
5830 enum htx_blk_type btype;
5831 uint32_t bsize;
5832 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005833
Willy Tarreau7838a792019-08-12 18:42:03 +02005834 TRACE_ENTER(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
5835
Olivier Houchardd360ac62019-03-22 17:37:16 +01005836 /* If we were not just woken because we wanted to send but couldn't,
5837 * and there's somebody else that is waiting to send, do nothing,
5838 * we will subscribe later and be put at the end of the list
5839 */
Willy Tarreaud9464162020-01-10 18:25:07 +01005840 if (!(h2s->flags & H2_SF_NOTIFIED) &&
Willy Tarreau7838a792019-08-12 18:42:03 +02005841 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list))) {
5842 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 +01005843 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005844 }
Willy Tarreaud9464162020-01-10 18:25:07 +01005845 h2s->flags &= ~H2_SF_NOTIFIED;
Olivier Houchard998410a2019-04-15 19:23:37 +02005846
Willy Tarreau7838a792019-08-12 18:42:03 +02005847 if (h2s->h2c->st0 < H2_CS_FRAME_H) {
5848 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 +02005849 return 0;
Willy Tarreau7838a792019-08-12 18:42:03 +02005850 }
Willy Tarreau6bf641a2018-10-08 09:43:03 +02005851
Willy Tarreaucab22952019-10-31 15:48:18 +01005852 if (h2s->h2c->st0 >= H2_CS_ERROR) {
5853 cs->flags |= CS_FL_ERROR;
5854 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);
5855 return 0;
5856 }
5857
Christopher Faulet9b79a102019-07-15 11:22:56 +02005858 htx = htx_from_buf(buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005859
Willy Tarreau0bad0432018-06-14 16:54:01 +02005860 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01005861 h2s->flags |= H2_SF_OUTGOING_DATA;
5862
Willy Tarreau751f2d02018-10-05 09:35:00 +02005863 if (h2s->id == 0) {
5864 int32_t id = h2c_get_next_sid(h2s->h2c);
5865
5866 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02005867 cs->flags |= CS_FL_ERROR;
Willy Tarreau7838a792019-08-12 18:42:03 +02005868 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 +02005869 return 0;
5870 }
5871
5872 eb32_delete(&h2s->by_id);
5873 h2s->by_id.key = h2s->id = id;
5874 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01005875 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005876 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
5877 }
5878
Christopher Faulet9b79a102019-07-15 11:22:56 +02005879 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
5880 count && !htx_is_empty(htx)) {
5881 idx = htx_get_head(htx);
5882 blk = htx_get_blk(htx, idx);
5883 btype = htx_get_blk_type(blk);
5884 bsize = htx_get_blksz(blk);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005885
Christopher Faulet9b79a102019-07-15 11:22:56 +02005886 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02005887 case HTX_BLK_REQ_SL:
5888 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005889 ret = h2s_bck_make_req_headers(h2s, htx);
Willy Tarreau80739692018-10-05 11:35:57 +02005890 if (ret > 0) {
5891 total += ret;
5892 count -= ret;
5893 if (ret < bsize)
5894 goto done;
5895 }
5896 break;
5897
Willy Tarreau115e83b2018-12-01 19:17:53 +01005898 case HTX_BLK_RES_SL:
5899 /* start-line before headers */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005900 ret = h2s_frt_make_resp_headers(h2s, htx);
Willy Tarreau115e83b2018-12-01 19:17:53 +01005901 if (ret > 0) {
5902 total += ret;
5903 count -= ret;
5904 if (ret < bsize)
5905 goto done;
5906 }
5907 break;
5908
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005909 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005910 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005911 /* all these cause the emission of a DATA frame (possibly empty).
5912 * This EOM necessarily is one before trailers, as the EOM following
5913 * trailers would have been consumed by the trailers parser.
5914 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005915 ret = h2s_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005916 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01005917 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005918 total += ret;
5919 count -= ret;
5920 if (ret < bsize)
5921 goto done;
5922 }
5923 break;
5924
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005925 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005926 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005927 /* This is the first trailers block, all the subsequent ones AND
5928 * the EOM will be swallowed by the parser.
5929 */
Christopher Faulet9b79a102019-07-15 11:22:56 +02005930 ret = h2s_make_trailers(h2s, htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005931 if (ret > 0) {
5932 total += ret;
5933 count -= ret;
5934 if (ret < bsize)
5935 goto done;
5936 }
5937 break;
5938
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005939 default:
5940 htx_remove_blk(htx, blk);
5941 total += bsize;
5942 count -= bsize;
5943 break;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005944 }
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005945 }
5946
Christopher Faulet9b79a102019-07-15 11:22:56 +02005947 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02005948 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02005949 /* trim any possibly pending data after we close (extra CR-LF,
5950 * unprocessed trailers, abnormal extra data, ...)
5951 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005952 total += count;
5953 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02005954 }
5955
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005956 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01005957 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005958 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 +01005959 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01005960 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01005961 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005962 }
5963
Christopher Faulet9b79a102019-07-15 11:22:56 +02005964 htx_to_buf(htx, buf);
Olivier Houchardd846c262018-10-19 17:24:29 +02005965
Olivier Houchard7505f942018-08-21 18:10:44 +02005966 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005967 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau7838a792019-08-12 18:42:03 +02005968 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 +02005969 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Olivier Houchardd846c262018-10-19 17:24:29 +02005970
Olivier Houchard7505f942018-08-21 18:10:44 +02005971 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01005972 /* If we're waiting for flow control, and we got a shutr on the
5973 * connection, we will never be unlocked, so add an error on
5974 * the conn_stream.
5975 */
5976 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
5977 !b_data(&h2s->h2c->dbuf) &&
5978 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
Willy Tarreau7838a792019-08-12 18:42:03 +02005979 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 +01005980 if (cs->flags & CS_FL_EOS)
5981 cs->flags |= CS_FL_ERROR;
5982 else
5983 cs->flags |= CS_FL_ERR_PENDING;
5984 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005985
Willy Tarreau5723f292020-01-10 15:16:57 +01005986 if (total > 0 && !(h2s->flags & H2_SF_BLK_SFCTL) &&
5987 !(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005988 /* Ok we managed to send something, leave the send_list if we were still there */
Olivier Houchardd360ac62019-03-22 17:37:16 +01005989 LIST_DEL_INIT(&h2s->list);
5990 }
Willy Tarreau9edf6db2019-10-02 10:49:59 +02005991
Willy Tarreau7838a792019-08-12 18:42:03 +02005992 TRACE_LEAVE(H2_EV_H2S_SEND|H2_EV_STRM_SEND, h2s->h2c->conn, h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005993 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02005994}
5995
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005996/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02005997static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005998{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01005999 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01006000 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006001 struct eb32_node *node;
6002 int fctl_cnt = 0;
6003 int send_cnt = 0;
6004 int tree_cnt = 0;
6005 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02006006 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006007
6008 if (!h2c)
6009 return;
6010
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006011 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006012 fctl_cnt++;
6013
Olivier Houchardfa8aa862018-10-10 18:25:41 +02006014 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006015 send_cnt++;
6016
Willy Tarreau3af37712018-12-18 14:34:41 +01006017 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006018 node = eb32_first(&h2c->streams_by_id);
6019 while (node) {
6020 h2s = container_of(node, struct h2s, by_id);
6021 tree_cnt++;
6022 if (!h2s->cs)
6023 orph_cnt++;
6024 node = eb32_next(node);
6025 }
6026
Willy Tarreau60f62682019-05-26 11:32:27 +02006027 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02006028 tmbuf = br_tail(h2c->mbuf);
Willy Tarreauab2ec452019-08-30 07:07:08 +02006029 chunk_appendf(msg, " h2c.st0=%s .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
Willy Tarreau987c0632018-12-18 10:32:05 +01006030 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02006031 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
6032 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreauab2ec452019-08-30 07:07:08 +02006033 h2c_st_to_str(h2c->st0), h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
Willy Tarreau616ac812018-07-24 14:12:42 +02006034 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01006035 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01006036 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
6037 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
6038 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02006039 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
6040 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
6041 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02006042 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
6043 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01006044
6045 if (h2s) {
Willy Tarreauab2ec452019-08-30 07:07:08 +02006046 chunk_appendf(msg, " last_h2s=%p .id=%d .st=%s.flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
6047 h2s, h2s->id, h2s_st_to_str(h2s->st), h2s->flags,
Willy Tarreau987c0632018-12-18 10:32:05 +01006048 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
6049 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
6050 h2s->cs);
6051 if (h2s->cs)
6052 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
6053 h2s->cs->flags, h2s->cs->data);
6054 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006055}
Willy Tarreau62f52692017-10-08 23:01:42 +02006056
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006057/* Migrate the the connection to the current thread.
6058 * Return 0 if successful, non-zero otherwise.
6059 * Expected to be called with the old thread lock held.
6060 */
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006061static int h2_takeover(struct connection *conn, int orig_tid)
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006062{
6063 struct h2c *h2c = conn->ctx;
Willy Tarreau617e80f2020-07-01 16:39:33 +02006064 struct task *task;
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006065
6066 if (fd_takeover(conn->handle.fd, conn) != 0)
6067 return -1;
Olivier Houcharda74bb7e2020-07-03 14:01:21 +02006068
6069 if (conn->xprt->takeover && conn->xprt->takeover(conn, conn->xprt_ctx, orig_tid) != 0) {
6070 /* We failed to takeover the xprt, even if the connection may
6071 * still be valid, flag it as error'd, as we have already
6072 * taken over the fd, and wake the tasklet, so that it will
6073 * destroy it.
6074 */
6075 conn->flags |= CO_FL_ERROR;
6076 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
6077 return -1;
6078 }
6079
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006080 if (h2c->wait_event.events)
6081 h2c->conn->xprt->unsubscribe(h2c->conn, h2c->conn->xprt_ctx,
6082 h2c->wait_event.events, &h2c->wait_event);
6083 /* To let the tasklet know it should free itself, and do nothing else,
6084 * set its context to NULL.
6085 */
6086 h2c->wait_event.tasklet->context = NULL;
Olivier Houchard1662cdb2020-07-03 14:04:37 +02006087 tasklet_wakeup_on(h2c->wait_event.tasklet, orig_tid);
Willy Tarreau617e80f2020-07-01 16:39:33 +02006088
6089 task = h2c->task;
6090 if (task) {
6091 task->context = NULL;
6092 h2c->task = NULL;
6093 __ha_barrier_store();
6094 task_kill(task);
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006095
6096 h2c->task = task_new(tid_bit);
6097 if (!h2c->task) {
6098 h2_release(h2c);
6099 return -1;
6100 }
6101 h2c->task->process = h2_timeout_task;
6102 h2c->task->context = h2c;
6103 }
6104 h2c->wait_event.tasklet = tasklet_new();
6105 if (!h2c->wait_event.tasklet) {
6106 h2_release(h2c);
6107 return -1;
6108 }
6109 h2c->wait_event.tasklet->process = h2_io_cb;
6110 h2c->wait_event.tasklet->context = h2c;
6111 h2c->conn->xprt->subscribe(h2c->conn, h2c->conn->xprt_ctx,
6112 SUB_RETRY_RECV, &h2c->wait_event);
6113
6114 return 0;
6115}
6116
Willy Tarreau62f52692017-10-08 23:01:42 +02006117/*******************************************************/
6118/* functions below are dedicated to the config parsers */
6119/*******************************************************/
6120
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006121/* config parser for global "tune.h2.header-table-size" */
6122static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
6123 struct proxy *defpx, const char *file, int line,
6124 char **err)
6125{
6126 if (too_many_args(1, args, err, NULL))
6127 return -1;
6128
6129 h2_settings_header_table_size = atoi(args[1]);
6130 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
6131 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
6132 return -1;
6133 }
6134 return 0;
6135}
Willy Tarreau62f52692017-10-08 23:01:42 +02006136
Willy Tarreaue6baec02017-07-27 11:45:11 +02006137/* config parser for global "tune.h2.initial-window-size" */
6138static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
6139 struct proxy *defpx, const char *file, int line,
6140 char **err)
6141{
6142 if (too_many_args(1, args, err, NULL))
6143 return -1;
6144
6145 h2_settings_initial_window_size = atoi(args[1]);
6146 if (h2_settings_initial_window_size < 0) {
6147 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6148 return -1;
6149 }
6150 return 0;
6151}
6152
Willy Tarreau5242ef82017-07-27 11:47:28 +02006153/* config parser for global "tune.h2.max-concurrent-streams" */
6154static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
6155 struct proxy *defpx, const char *file, int line,
6156 char **err)
6157{
6158 if (too_many_args(1, args, err, NULL))
6159 return -1;
6160
6161 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01006162 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02006163 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
6164 return -1;
6165 }
6166 return 0;
6167}
6168
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006169/* config parser for global "tune.h2.max-frame-size" */
6170static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
6171 struct proxy *defpx, const char *file, int line,
6172 char **err)
6173{
6174 if (too_many_args(1, args, err, NULL))
6175 return -1;
6176
6177 h2_settings_max_frame_size = atoi(args[1]);
6178 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
6179 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
6180 return -1;
6181 }
6182 return 0;
6183}
6184
Willy Tarreau62f52692017-10-08 23:01:42 +02006185
6186/****************************************/
Ilya Shipitsin46a030c2020-07-05 16:36:08 +05006187/* MUX initialization and instantiation */
Willy Tarreau62f52692017-10-08 23:01:42 +02006188/***************************************/
6189
6190/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01006191static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02006192 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02006193 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02006194 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02006195 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02006196 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02006197 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02006198 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01006199 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02006200 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01006201 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01006202 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01006203 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02006204 .shutr = h2_shutr,
6205 .shutw = h2_shutw,
Olivier Houchard9b8e11e2019-10-25 16:19:26 +02006206 .ctl = h2_ctl,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02006207 .show_fd = h2_show_fd,
Olivier Houchardcd4159f2020-03-10 18:39:42 +01006208 .takeover = h2_takeover,
Christopher Faulet9b79a102019-07-15 11:22:56 +02006209 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX,
Willy Tarreau62f52692017-10-08 23:01:42 +02006210 .name = "H2",
6211};
6212
Christopher Faulet32f61c02018-04-10 14:33:41 +02006213static struct mux_proto_list mux_proto_h2 =
Christopher Fauletc985f6c2019-07-15 11:42:52 +02006214 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_BOTH, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02006215
Willy Tarreau0108d902018-11-25 19:14:37 +01006216INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
6217
Willy Tarreau62f52692017-10-08 23:01:42 +02006218/* config keyword parsers */
6219static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02006220 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02006221 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02006222 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01006223 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02006224 { 0, NULL, NULL }
6225}};
6226
Willy Tarreau0108d902018-11-25 19:14:37 +01006227INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);
Willy Tarreau2bdcc702020-05-19 11:31:11 +02006228
6229/* initialize internal structs after the config is parsed.
6230 * Returns zero on success, non-zero on error.
6231 */
6232static int init_h2()
6233{
6234 pool_head_hpack_tbl = create_pool("hpack_tbl",
6235 h2_settings_header_table_size,
6236 MEM_F_SHARED|MEM_F_EXACT);
6237 if (!pool_head_hpack_tbl)
6238 return -1;
6239 return 0;
6240}
6241
6242REGISTER_POST_CHECK(init_h2);