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Willy Tarreau62f52692017-10-08 23:01:42 +02001/*
2 * HTTP/2 mux-demux for connections
3 *
4 * Copyright 2017 Willy Tarreau <w@1wt.eu>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <common/cfgparse.h>
14#include <common/config.h>
Willy Tarreauafba57a2018-12-11 13:44:24 +010015#include <common/h1.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020016#include <common/h2.h>
Willy Tarreau13278b42017-10-13 19:23:14 +020017#include <common/hpack-dec.h>
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +020018#include <common/hpack-enc.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020019#include <common/hpack-tbl.h>
Willy Tarreaub96b77e2018-12-11 10:22:41 +010020#include <common/htx.h>
Willy Tarreau0108d902018-11-25 19:14:37 +010021#include <common/initcall.h>
Willy Tarreaue4820742017-07-27 13:37:23 +020022#include <common/net_helper.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020023#include <proto/connection.h>
Willy Tarreaubcd3bb32018-12-01 18:59:00 +010024#include <proto/http_htx.h>
Olivier Houchard44d59142018-12-13 18:46:22 +010025#include <proto/session.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020026#include <proto/stream.h>
Olivier Houchard44d59142018-12-13 18:46:22 +010027#include <proto/stream_interface.h>
Willy Tarreauea392822017-10-31 10:02:25 +010028#include <types/session.h>
Willy Tarreau5ab6b572017-09-22 08:05:00 +020029#include <eb32tree.h>
Willy Tarreau62f52692017-10-08 23:01:42 +020030
31
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010032/* dummy streams returned for closed, error, refused, idle and states */
Willy Tarreau2a856182017-05-16 15:20:39 +020033static const struct h2s *h2_closed_stream;
Willy Tarreauecb9dcd2019-01-03 12:00:17 +010034static const struct h2s *h2_error_stream;
Willy Tarreau8d0d58b2018-12-23 18:29:12 +010035static const struct h2s *h2_refused_stream;
Willy Tarreau2a856182017-05-16 15:20:39 +020036static const struct h2s *h2_idle_stream;
37
Willy Tarreau5ab6b572017-09-22 08:05:00 +020038/* Connection flags (32 bit), in h2c->flags */
39#define H2_CF_NONE 0x00000000
40
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020041/* Flags indicating why writing to the mux is blocked. */
42#define H2_CF_MUX_MALLOC 0x00000001 // mux blocked on lack of connection's mux buffer
43#define H2_CF_MUX_MFULL 0x00000002 // mux blocked on connection's mux buffer full
44#define H2_CF_MUX_BLOCK_ANY 0x00000003 // aggregate of the mux flags above
45
Willy Tarreau315d8072017-12-10 22:17:57 +010046/* Flags indicating why writing to the demux is blocked.
47 * The first two ones directly affect the ability for the mux to receive data
48 * from the connection. The other ones affect the mux's ability to demux
49 * received data.
50 */
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020051#define H2_CF_DEM_DALLOC 0x00000004 // demux blocked on lack of connection's demux buffer
52#define H2_CF_DEM_DFULL 0x00000008 // demux blocked on connection's demux buffer full
Willy Tarreau315d8072017-12-10 22:17:57 +010053
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020054#define H2_CF_DEM_MBUSY 0x00000010 // demux blocked on connection's mux side busy
55#define H2_CF_DEM_MROOM 0x00000020 // demux blocked on lack of room in mux buffer
56#define H2_CF_DEM_SALLOC 0x00000040 // demux blocked on lack of stream's request buffer
57#define H2_CF_DEM_SFULL 0x00000080 // demux blocked on stream request buffer full
Willy Tarreauf2101912018-07-19 10:11:38 +020058#define H2_CF_DEM_TOOMANY 0x00000100 // demux blocked waiting for some conn_streams to leave
59#define H2_CF_DEM_BLOCK_ANY 0x000001F0 // aggregate of the demux flags above except DALLOC/DFULL
Willy Tarreau2e5b60e2017-09-25 11:49:03 +020060
Willy Tarreau081d4722017-05-16 21:51:05 +020061/* other flags */
Willy Tarreauf2101912018-07-19 10:11:38 +020062#define H2_CF_GOAWAY_SENT 0x00001000 // a GOAWAY frame was successfully sent
63#define H2_CF_GOAWAY_FAILED 0x00002000 // a GOAWAY frame failed to be sent
64#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 +020065#define H2_CF_IS_BACK 0x00008000 // this is an outgoing connection
Willy Tarreau97aaa672018-12-23 09:49:04 +010066#define H2_CF_WINDOW_OPENED 0x00010000 // demux increased window already advertised
Willy Tarreau081d4722017-05-16 21:51:05 +020067
Willy Tarreau5ab6b572017-09-22 08:05:00 +020068/* H2 connection state, in h2c->st0 */
69enum h2_cs {
70 H2_CS_PREFACE, // init done, waiting for connection preface
71 H2_CS_SETTINGS1, // preface OK, waiting for first settings frame
72 H2_CS_FRAME_H, // first settings frame ok, waiting for frame header
73 H2_CS_FRAME_P, // frame header OK, waiting for frame payload
Willy Tarreaua20a5192017-12-27 11:02:06 +010074 H2_CS_FRAME_A, // frame payload OK, trying to send ACK frame
75 H2_CS_FRAME_E, // frame payload OK, trying to send RST frame
Willy Tarreau5ab6b572017-09-22 08:05:00 +020076 H2_CS_ERROR, // send GOAWAY(errcode) and close the connection ASAP
77 H2_CS_ERROR2, // GOAWAY(errcode) sent, close the connection ASAP
78 H2_CS_ENTRIES // must be last
79} __attribute__((packed));
80
Willy Tarreau51330962019-05-26 09:38:07 +020081
Willy Tarreau9c218e72019-05-26 10:08:28 +020082/* 32 buffers: one for the ring's root, rest for the mbuf itself */
83#define H2C_MBUF_CNT 32
Willy Tarreau51330962019-05-26 09:38:07 +020084
Willy Tarreau5ab6b572017-09-22 08:05:00 +020085/* H2 connection descriptor */
86struct h2c {
87 struct connection *conn;
88
89 enum h2_cs st0; /* mux state */
90 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
91
92 /* 16 bit hole here */
93 uint32_t flags; /* connection flags: H2_CF_* */
Willy Tarreau2e2083a2019-01-31 10:34:07 +010094 uint32_t streams_limit; /* maximum number of concurrent streams the peer supports */
Willy Tarreau5ab6b572017-09-22 08:05:00 +020095 int32_t max_id; /* highest ID known on this connection, <0 before preface */
96 uint32_t rcvd_c; /* newly received data to ACK for the connection */
97 uint32_t rcvd_s; /* newly received data to ACK for the current stream (dsi) */
98
99 /* states for the demux direction */
100 struct hpack_dht *ddht; /* demux dynamic header table */
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200101 struct buffer dbuf; /* demux buffer */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200102
103 int32_t dsi; /* demux stream ID (<0 = idle) */
104 int32_t dfl; /* demux frame length (if dsi >= 0) */
105 int8_t dft; /* demux frame type (if dsi >= 0) */
106 int8_t dff; /* demux frame flags (if dsi >= 0) */
Willy Tarreau05e5daf2017-12-11 15:17:36 +0100107 uint8_t dpl; /* demux pad length (part of dfl), init to 0 */
108 /* 8 bit hole here */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200109 int32_t last_sid; /* last processed stream ID for GOAWAY, <0 before preface */
110
111 /* states for the mux direction */
Willy Tarreau51330962019-05-26 09:38:07 +0200112 struct buffer mbuf[H2C_MBUF_CNT]; /* mux buffers (ring) */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200113 int32_t msi; /* mux stream ID (<0 = idle) */
114 int32_t mfl; /* mux frame length (if dsi >= 0) */
115 int8_t mft; /* mux frame type (if dsi >= 0) */
116 int8_t mff; /* mux frame flags (if dsi >= 0) */
117 /* 16 bit hole here */
118 int32_t miw; /* mux initial window size for all new streams */
119 int32_t mws; /* mux window size. Can be negative. */
120 int32_t mfs; /* mux's max frame size */
121
Willy Tarreauea392822017-10-31 10:02:25 +0100122 int timeout; /* idle timeout duration in ticks */
Willy Tarreau599391a2017-11-24 10:16:00 +0100123 int shut_timeout; /* idle timeout duration in ticks after GOAWAY was sent */
Willy Tarreau49745612017-12-03 18:56:02 +0100124 unsigned int nb_streams; /* number of streams in the tree */
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200125 unsigned int nb_cs; /* number of attached conn_streams */
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100126 unsigned int nb_reserved; /* number of reserved streams */
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100127 unsigned int stream_cnt; /* total number of streams seen */
Willy Tarreau0b37d652018-10-03 10:33:02 +0200128 struct proxy *proxy; /* the proxy this connection was created for */
Willy Tarreauea392822017-10-31 10:02:25 +0100129 struct task *task; /* timeout management task */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200130 struct eb_root streams_by_id; /* all active streams by their ID */
131 struct list send_list; /* list of blocked streams requesting to send */
132 struct list fctl_list; /* list of streams blocked by connection's fctl */
Olivier Houchardd846c262018-10-19 17:24:29 +0200133 struct list sending_list; /* list of h2s scheduled to send data */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100134 struct buffer_wait buf_wait; /* wait list for buffer allocations */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200135 struct wait_event wait_event; /* To be used if we're waiting for I/Os */
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200136};
137
Willy Tarreau18312642017-10-11 07:57:07 +0200138/* H2 stream state, in h2s->st */
139enum h2_ss {
140 H2_SS_IDLE = 0, // idle
141 H2_SS_RLOC, // reserved(local)
142 H2_SS_RREM, // reserved(remote)
143 H2_SS_OPEN, // open
144 H2_SS_HREM, // half-closed(remote)
145 H2_SS_HLOC, // half-closed(local)
Willy Tarreau96060ba2017-10-16 18:34:34 +0200146 H2_SS_ERROR, // an error needs to be sent using RST_STREAM
Willy Tarreau18312642017-10-11 07:57:07 +0200147 H2_SS_CLOSED, // closed
148 H2_SS_ENTRIES // must be last
149} __attribute__((packed));
150
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200151#define H2_SS_MASK(state) (1UL << (state))
152#define H2_SS_IDLE_BIT (1UL << H2_SS_IDLE)
153#define H2_SS_RLOC_BIT (1UL << H2_SS_RLOC)
154#define H2_SS_RREM_BIT (1UL << H2_SS_RREM)
155#define H2_SS_OPEN_BIT (1UL << H2_SS_OPEN)
156#define H2_SS_HREM_BIT (1UL << H2_SS_HREM)
157#define H2_SS_HLOC_BIT (1UL << H2_SS_HLOC)
158#define H2_SS_ERROR_BIT (1UL << H2_SS_ERROR)
159#define H2_SS_CLOSED_BIT (1UL << H2_SS_CLOSED)
Willy Tarreau4c688eb2019-05-14 11:44:03 +0200160
Willy Tarreau18312642017-10-11 07:57:07 +0200161/* HTTP/2 stream flags (32 bit), in h2s->flags */
162#define H2_SF_NONE 0x00000000
163#define H2_SF_ES_RCVD 0x00000001
164#define H2_SF_ES_SENT 0x00000002
165
166#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
167#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
168
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200169/* stream flags indicating the reason the stream is blocked */
170#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
171#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux
172#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl
173#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl
174#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
175
Willy Tarreau454f9052017-10-26 19:40:35 +0200176/* stream flags indicating how data is supposed to be sent */
177#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
178#define H2_SF_DATA_CHNK 0x00000200 // data sent using chunked-encoding
179
180/* step we're currently in when sending chunks. This is needed because we may
181 * have to transfer chunks as large as a full buffer so there's no room left
182 * for size nor crlf around.
183 */
184#define H2_SF_CHNK_SIZE 0x00000000 // trying to send chunk size
185#define H2_SF_CHNK_DATA 0x00000400 // trying to send chunk data
186#define H2_SF_CHNK_CRLF 0x00000800 // trying to send chunk crlf after data
187
188#define H2_SF_CHNK_MASK 0x00000C00 // trying to send chunk size
189
Willy Tarreau67434202017-11-06 20:20:51 +0100190#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100191#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100192
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100193#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
194
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200195#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
196#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200197#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200198
199
Willy Tarreau18312642017-10-11 07:57:07 +0200200/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
201 * it is being processed in the internal HTTP representation (H1 for now).
202 */
203struct h2s {
204 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100205 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200206 struct h2c *h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +0200207 struct h1m h1m; /* request or response parser state for H1 */
Willy Tarreau18312642017-10-11 07:57:07 +0200208 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200209 int32_t id; /* stream ID */
210 uint32_t flags; /* H2_SF_* */
Willy Tarreau5a9c8752019-08-02 07:52:08 +0200211 int sws; /* stream window size, to be added to the mux's initial window size */
Willy Tarreau18312642017-10-11 07:57:07 +0200212 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
213 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200214 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100215 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200216 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200217 struct wait_event wait_event; /* Wait list, when we're attempting to send a RST but we can't send */
Willy Tarreau749f5ca2019-03-21 19:19:36 +0100218 struct wait_event *recv_wait; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
219 struct wait_event *send_wait; /* send wait_event the conn_stream associated is waiting on (via h2_subscribe) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200220 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Olivier Houchardd360ac62019-03-22 17:37:16 +0100221 struct list sending_list; /* To be used when adding in h2c->sending_list */
Willy Tarreau18312642017-10-11 07:57:07 +0200222};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200223
Willy Tarreauc6405142017-09-21 20:23:50 +0200224/* descriptor for an h2 frame header */
225struct h2_fh {
226 uint32_t len; /* length, host order, 24 bits */
227 uint32_t sid; /* stream id, host order, 31 bits */
228 uint8_t ft; /* frame type */
229 uint8_t ff; /* frame flags */
230};
231
Willy Tarreau8ceae722018-11-26 11:58:30 +0100232/* the h2c connection pool */
233DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
234
235/* the h2s stream pool */
236DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
237
Willy Tarreaudc572362018-12-12 08:08:05 +0100238/* The default connection window size is 65535, it may only be enlarged using
239 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
240 * we'll pretend we already received the difference between the two to send
241 * an equivalent window update to enlarge it to 2G-1.
242 */
243#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
244
Willy Tarreau455d5682019-05-24 19:42:18 +0200245/* maximum amount of data we're OK with re-aligning for buffer optimizations */
246#define MAX_DATA_REALIGN 1024
247
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200248/* a few settings from the global section */
249static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200250static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100251static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100252static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200253
Willy Tarreau2a856182017-05-16 15:20:39 +0200254/* a dmumy closed stream */
255static const struct h2s *h2_closed_stream = &(const struct h2s){
256 .cs = NULL,
257 .h2c = NULL,
258 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100259 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100260 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200261 .id = 0,
262};
263
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100264/* a dmumy closed stream returning a PROTOCOL_ERROR error */
265static const struct h2s *h2_error_stream = &(const struct h2s){
266 .cs = NULL,
267 .h2c = NULL,
268 .st = H2_SS_CLOSED,
269 .errcode = H2_ERR_PROTOCOL_ERROR,
270 .flags = 0,
271 .id = 0,
272};
273
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100274/* a dmumy closed stream returning a REFUSED_STREAM error */
275static const struct h2s *h2_refused_stream = &(const struct h2s){
276 .cs = NULL,
277 .h2c = NULL,
278 .st = H2_SS_CLOSED,
279 .errcode = H2_ERR_REFUSED_STREAM,
280 .flags = 0,
281 .id = 0,
282};
283
Willy Tarreau2a856182017-05-16 15:20:39 +0200284/* and a dummy idle stream for use with any unannounced stream */
285static const struct h2s *h2_idle_stream = &(const struct h2s){
286 .cs = NULL,
287 .h2c = NULL,
288 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100289 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200290 .id = 0,
291};
292
Olivier Houchard9f6af332018-05-25 14:04:04 +0200293static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200294static int h2_send(struct h2c *h2c);
295static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200296static int h2_process(struct h2c *h2c);
Olivier Houchard29fb89d2018-08-02 18:56:36 +0200297static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100298static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100299static 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 +0100300static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200301static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100302static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100303static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200304
Olivier Houchard7a977432019-03-21 15:47:13 +0100305static __inline int
306h2c_is_dead(struct h2c *h2c)
307{
308 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
309 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
310 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
311 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200312 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100313 (conn_xprt_read0_pending(h2c->conn) ||
314 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
315 return 1;
316
317 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100318}
319
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200320/*****************************************************/
321/* functions below are for dynamic buffer management */
322/*****************************************************/
323
Willy Tarreau315d8072017-12-10 22:17:57 +0100324/* indicates whether or not the we may call the h2_recv() function to attempt
325 * to receive data into the buffer and/or demux pending data. The condition is
326 * a bit complex due to some API limits for now. The rules are the following :
327 * - if an error or a shutdown was detected on the connection and the buffer
328 * is empty, we must not attempt to receive
329 * - if the demux buf failed to be allocated, we must not try to receive and
330 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100331 * - if no flag indicates a blocking condition, we may attempt to receive,
332 * regardless of whether the demux buffer is full or not, so that only
333 * de demux part decides whether or not to block. This is needed because
334 * the connection API indeed prevents us from re-enabling receipt that is
335 * already enabled in a polled state, so we must always immediately stop
336 * as soon as the demux can't proceed so as never to hit an end of read
337 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100338 * - otherwise must may not attempt
339 */
340static inline int h2_recv_allowed(const struct h2c *h2c)
341{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200342 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100343 (h2c->st0 >= H2_CS_ERROR ||
344 h2c->conn->flags & CO_FL_ERROR ||
345 conn_xprt_read0_pending(h2c->conn)))
346 return 0;
347
348 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100349 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100350 return 1;
351
352 return 0;
353}
354
Willy Tarreau47b515a2018-12-21 16:09:41 +0100355/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200356static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100357{
358 if (!h2_recv_allowed(h2c))
359 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200360 if ((!consider_buffer || !b_data(&h2c->dbuf))
361 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100362 return;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200363 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau47b515a2018-12-21 16:09:41 +0100364}
365
366
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100367/* returns true if the front connection has too many conn_streams attached */
368static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200369{
Willy Tarreaua8754662018-12-23 20:43:58 +0100370 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200371}
372
Willy Tarreau44e973f2018-03-01 17:49:30 +0100373/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
374 * flags are used to figure what buffer was requested. It returns 1 if the
375 * allocation succeeds, in which case the connection is woken up, or 0 if it's
376 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200377 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100378static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200379{
380 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100381 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200382
Willy Tarreau44e973f2018-03-01 17:49:30 +0100383 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200384 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200385 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200386 return 1;
387 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200388
Willy Tarreau51330962019-05-26 09:38:07 +0200389 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100390 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200391
392 if (h2c->flags & H2_CF_DEM_MROOM) {
393 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200394 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200395 }
Willy Tarreau14398122017-09-22 14:26:04 +0200396 return 1;
397 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100398
399 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
400 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200401 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100402 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200403 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100404 return 1;
405 }
406
Willy Tarreau14398122017-09-22 14:26:04 +0200407 return 0;
408}
409
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200410static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200411{
412 struct buffer *buf = NULL;
413
Willy Tarreauc234ae32019-05-13 17:56:11 +0200414 if (likely(!LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100415 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
416 h2c->buf_wait.target = h2c;
417 h2c->buf_wait.wakeup_cb = h2_buf_available;
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100418 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100419 LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100420 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau14398122017-09-22 14:26:04 +0200421 __conn_xprt_stop_recv(h2c->conn);
422 }
423 return buf;
424}
425
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200426static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200427{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200428 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100429 b_free(bptr);
Willy Tarreau201840a2019-05-29 17:50:48 +0200430 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200431 }
432}
433
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200434static inline void h2_release_mbuf(struct h2c *h2c)
435{
436 struct buffer *buf;
437 unsigned int count = 0;
438
439 while (b_size(buf = br_head_pick(h2c->mbuf))) {
440 b_free(buf);
441 count++;
442 }
443 if (count)
Willy Tarreau201840a2019-05-29 17:50:48 +0200444 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200445}
446
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100447/* returns the number of allocatable outgoing streams for the connection taking
448 * the last_sid and the reserved ones into account.
449 */
450static inline int h2_streams_left(const struct h2c *h2c)
451{
452 int ret;
453
454 /* consider the number of outgoing streams we're allowed to create before
455 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
456 * nb_reserved is the number of streams which don't yet have an ID.
457 */
458 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
459 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
460 if (ret < 0)
461 ret = 0;
462 return ret;
463}
464
Willy Tarreau00f18a32019-01-26 12:19:01 +0100465/* returns the number of streams in use on a connection to figure if it's
466 * idle or not. We check nb_cs and not nb_streams as the caller will want
467 * to know if it was the last one after a detach().
468 */
469static int h2_used_streams(struct connection *conn)
470{
471 struct h2c *h2c = conn->ctx;
472
473 return h2c->nb_cs;
474}
475
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100476/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100477static int h2_avail_streams(struct connection *conn)
478{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100479 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100480 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100481 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100482
Willy Tarreau6afec462019-01-28 06:40:19 +0100483 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
484 * streams on the connection.
485 */
486 if (h2c->last_sid >= 0)
487 return 0;
488
Willy Tarreau86949782019-01-31 10:42:05 +0100489 /* note: may be negative if a SETTINGS frame changes the limit */
490 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100491
492 /* we must also consider the limit imposed by stream IDs */
493 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100494 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100495 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100496 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
497 ret1 = MIN(ret1, ret2);
498 }
499 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100500}
501
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200502
Willy Tarreau62f52692017-10-08 23:01:42 +0200503/*****************************************************************/
504/* functions below are dedicated to the mux setup and management */
505/*****************************************************************/
506
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200507/* Initialize the mux once it's attached. For outgoing connections, the context
508 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200509 * connections from the fact that the context is still NULL (even during mux
510 * upgrades). <input> is always used as Input buffer and may contain data. It is
511 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200512 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200513static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
514 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200515{
516 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100517 struct task *t = NULL;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200518
Willy Tarreaubafbe012017-11-24 17:34:44 +0100519 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200520 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200521 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200522
Christopher Faulete9b70722019-04-08 10:46:02 +0200523 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200524 h2c->flags = H2_CF_IS_BACK;
525 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
526 if (tick_isset(prx->timeout.serverfin))
527 h2c->shut_timeout = prx->timeout.serverfin;
528 } else {
529 h2c->flags = H2_CF_NONE;
530 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
531 if (tick_isset(prx->timeout.clientfin))
532 h2c->shut_timeout = prx->timeout.clientfin;
533 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100534
Willy Tarreau0b37d652018-10-03 10:33:02 +0200535 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100536 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100537 if (tick_isset(h2c->timeout)) {
538 t = task_new(tid_bit);
539 if (!t)
540 goto fail;
541
542 h2c->task = t;
543 t->process = h2_timeout_task;
544 t->context = h2c;
545 t->expire = tick_add(now_ms, h2c->timeout);
546 }
Willy Tarreauea392822017-10-31 10:02:25 +0100547
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200548 h2c->wait_event.tasklet = tasklet_new();
549 if (!h2c->wait_event.tasklet)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200550 goto fail;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200551 h2c->wait_event.tasklet->process = h2_io_cb;
552 h2c->wait_event.tasklet->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100553 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200554
Willy Tarreau32218eb2017-09-22 08:07:25 +0200555 h2c->ddht = hpack_dht_alloc(h2_settings_header_table_size);
556 if (!h2c->ddht)
557 goto fail;
558
559 /* Initialise the context. */
560 h2c->st0 = H2_CS_PREFACE;
561 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100562 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200563 h2c->max_id = -1;
564 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100565 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200566 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100567 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200568 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100569 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100570 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200571
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200572 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200573 h2c->dsi = -1;
574 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100575
Willy Tarreau32218eb2017-09-22 08:07:25 +0200576 h2c->last_sid = -1;
577
Willy Tarreau51330962019-05-26 09:38:07 +0200578 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200579 h2c->miw = 65535; /* mux initial window size */
580 h2c->mws = 65535; /* mux window size */
581 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200582 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200583 LIST_INIT(&h2c->send_list);
584 LIST_INIT(&h2c->fctl_list);
Olivier Houchardd846c262018-10-19 17:24:29 +0200585 LIST_INIT(&h2c->sending_list);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100586 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200587
Willy Tarreau3f133572017-10-31 19:21:06 +0100588 if (t)
589 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100590
Willy Tarreau01b44822018-10-03 14:26:37 +0200591 if (h2c->flags & H2_CF_IS_BACK) {
592 /* FIXME: this is temporary, for outgoing connections we need
593 * to immediately allocate a stream until the code is modified
594 * so that the caller calls ->attach(). For now the outgoing cs
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100595 * is stored as conn->ctx by the caller.
Willy Tarreau01b44822018-10-03 14:26:37 +0200596 */
597 struct h2s *h2s;
598
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100599 h2s = h2c_bck_stream_new(h2c, conn->ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200600 if (!h2s)
601 goto fail_stream;
602 }
603
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100604 conn->ctx = h2c;
Willy Tarreau01b44822018-10-03 14:26:37 +0200605
Willy Tarreau0f383582018-10-03 14:22:21 +0200606 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200607 h2c_restart_reading(h2c, 1);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200608 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +0200609 fail_stream:
610 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +0200611 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +0200612 task_destroy(t);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200613 if (h2c->wait_event.tasklet)
614 tasklet_free(h2c->wait_event.tasklet);
Willy Tarreaubafbe012017-11-24 17:34:44 +0100615 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +0200616 fail_no_h2c:
Willy Tarreau32218eb2017-09-22 08:07:25 +0200617 return -1;
618}
619
Willy Tarreau751f2d02018-10-05 09:35:00 +0200620/* returns the next allocatable outgoing stream ID for the H2 connection, or
621 * -1 if no more is allocatable.
622 */
623static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
624{
625 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +0100626
627 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +0200628 id = -1;
629 return id;
630}
631
Willy Tarreau2373acc2017-10-12 17:35:14 +0200632/* returns the stream associated with id <id> or NULL if not found */
633static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
634{
635 struct eb32_node *node;
636
Willy Tarreau751f2d02018-10-05 09:35:00 +0200637 if (id == 0)
638 return (struct h2s *)h2_closed_stream;
639
Willy Tarreau2a856182017-05-16 15:20:39 +0200640 if (id > h2c->max_id)
641 return (struct h2s *)h2_idle_stream;
642
Willy Tarreau2373acc2017-10-12 17:35:14 +0200643 node = eb32_lookup(&h2c->streams_by_id, id);
644 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +0200645 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +0200646
647 return container_of(node, struct h2s, by_id);
648}
649
Christopher Faulet73c12072019-04-08 11:23:22 +0200650/* release function. This one should be called to free all resources allocated
651 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +0200652 */
Christopher Faulet73c12072019-04-08 11:23:22 +0200653static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +0200654{
Christopher Faulet61840e72019-04-15 09:33:32 +0200655 struct connection *conn = NULL;;
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200656
Willy Tarreau32218eb2017-09-22 08:07:25 +0200657 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +0200658 /* The connection must be aattached to this mux to be released */
659 if (h2c->conn && h2c->conn->ctx == h2c)
660 conn = h2c->conn;
661
Willy Tarreau32218eb2017-09-22 08:07:25 +0200662 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +0200663
Willy Tarreau186e96e2019-05-28 17:21:18 +0200664 if (LIST_ADDED(&h2c->buf_wait.list)) {
665 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
666 LIST_DEL(&h2c->buf_wait.list);
667 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
668 }
Willy Tarreau14398122017-09-22 14:26:04 +0200669
Willy Tarreau44e973f2018-03-01 17:49:30 +0100670 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200671 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100672
Willy Tarreauea392822017-10-31 10:02:25 +0100673 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +0200674 h2c->task->context = NULL;
675 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +0100676 h2c->task = NULL;
677 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200678 if (h2c->wait_event.tasklet)
679 tasklet_free(h2c->wait_event.tasklet);
Christopher Faulet0e012562019-09-18 11:07:20 +0200680 if (conn && h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +0100681 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Christopher Faulet0e012562019-09-18 11:07:20 +0200682 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +0100683
Willy Tarreaubafbe012017-11-24 17:34:44 +0100684 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200685 }
686
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200687 if (conn) {
688 conn->mux = NULL;
689 conn->ctx = NULL;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200690
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200691 conn_stop_tracking(conn);
692 conn_full_close(conn);
693 if (conn->destroy_cb)
694 conn->destroy_cb(conn);
695 conn_free(conn);
696 }
Willy Tarreau62f52692017-10-08 23:01:42 +0200697}
698
699
Willy Tarreau71681172017-10-23 14:39:06 +0200700/******************************************************/
701/* functions below are for the H2 protocol processing */
702/******************************************************/
703
704/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +0100705static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +0200706{
707 return h2s ? h2s->id : 0;
708}
709
Willy Tarreau5a9c8752019-08-02 07:52:08 +0200710/* returns the sum of the stream's own window size and the mux's initial
711 * window, which together form the stream's effective window size.
712 */
713static inline int h2s_mws(const struct h2s *h2s)
714{
715 return h2s->sws + h2s->h2c->miw;
716}
717
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200718/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100719static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200720{
721 if (h2c->msi < 0)
722 return 0;
723
724 if (h2c->msi == h2s_id(h2s))
725 return 0;
726
727 return 1;
728}
729
Willy Tarreau741d6df2017-10-17 08:00:59 +0200730/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +0100731static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +0200732{
733 h2c->errcode = err;
734 h2c->st0 = H2_CS_ERROR;
735}
736
Willy Tarreau175cebb2019-01-24 10:02:24 +0100737/* marks an error on the stream. It may also update an already closed stream
738 * (e.g. to report an error after an RST was received).
739 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100740static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +0200741{
Willy Tarreau175cebb2019-01-24 10:02:24 +0100742 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau2e43f082017-10-17 08:03:59 +0200743 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +0100744 if (h2s->st < H2_SS_ERROR)
745 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +0100746 if (h2s->cs)
747 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +0200748 }
749}
750
Willy Tarreau7e094452018-12-19 18:08:52 +0100751/* attempt to notify the data layer of recv availability */
752static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
753{
754 struct wait_event *sw;
755
756 if (h2s->recv_wait) {
757 sw = h2s->recv_wait;
758 sw->events &= ~SUB_RETRY_RECV;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200759 tasklet_wakeup(sw->tasklet);
Willy Tarreau7e094452018-12-19 18:08:52 +0100760 h2s->recv_wait = NULL;
761 }
762}
763
764/* attempt to notify the data layer of send availability */
765static void __maybe_unused h2s_notify_send(struct h2s *h2s)
766{
767 struct wait_event *sw;
768
Willy Tarreauc234ae32019-05-13 17:56:11 +0200769 if (h2s->send_wait && !LIST_ADDED(&h2s->sending_list)) {
Willy Tarreau7e094452018-12-19 18:08:52 +0100770 sw = h2s->send_wait;
771 sw->events &= ~SUB_RETRY_SEND;
Olivier Houchardfd1e96d2019-03-25 14:04:25 +0100772 LIST_ADDQ(&h2s->h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200773 tasklet_wakeup(sw->tasklet);
Willy Tarreau7e094452018-12-19 18:08:52 +0100774 }
775}
776
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100777/* alerts the data layer, trying to wake it up by all means, following
778 * this sequence :
779 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
780 * - if its subscribed to send, then it's woken up for send
781 * - if it was subscribed to neither, its ->wake() callback is called
782 * It is safe to call this function with a closed stream which doesn't have a
783 * conn_stream anymore.
784 */
785static void __maybe_unused h2s_alert(struct h2s *h2s)
786{
787 if (h2s->recv_wait || h2s->send_wait) {
788 h2s_notify_recv(h2s);
789 h2s_notify_send(h2s);
790 }
791 else if (h2s->cs && h2s->cs->data_cb->wake != NULL)
792 h2s->cs->data_cb->wake(h2s->cs);
793}
794
Willy Tarreaue4820742017-07-27 13:37:23 +0200795/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100796static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +0200797{
798 uint8_t *out = frame;
799
800 *out = len >> 16;
801 write_n16(out + 1, len);
802}
803
Willy Tarreau54c15062017-10-10 17:10:03 +0200804/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
805 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
806 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +0200807 * available in the buffer's input prior to calling this function. The buffer
808 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +0200809 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100810static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +0200811 const struct buffer *b, int o)
812{
Willy Tarreau591d4452018-06-15 17:21:00 +0200813 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 +0200814}
815
Willy Tarreau1f094672017-11-20 21:27:45 +0100816static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200817{
Willy Tarreau591d4452018-06-15 17:21:00 +0200818 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200819}
820
Willy Tarreau1f094672017-11-20 21:27:45 +0100821static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200822{
Willy Tarreau591d4452018-06-15 17:21:00 +0200823 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200824}
825
Willy Tarreau1f094672017-11-20 21:27:45 +0100826static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200827{
Willy Tarreau591d4452018-06-15 17:21:00 +0200828 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200829}
830
831
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100832/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
833 * The algorithm is not obvious. It turns out that H2 headers are neither
834 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
835 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +0200836 *
837 * b0 b1 b2 b3 b4 b5..b8
838 * +----------+---------+--------+----+----+----------------------+
839 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
840 * +----------+---------+--------+----+----+----------------------+
841 *
842 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
843 * we get the sid properly aligned and ordered, and 16 bits of len properly
844 * ordered as well. The type and flags can be extracted using bit shifts from
845 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +0200846 * Returns zero if some bytes are missing, otherwise non-zero on success. The
847 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +0200848 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100849static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +0200850{
851 uint64_t w;
852
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100853 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +0200854 return 0;
855
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100856 w = h2_get_n64(b, o + 1);
857 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +0200858 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
859 h->ff = w >> 32;
860 h->ft = w >> 40;
861 h->len += w >> 48;
862 return 1;
863}
864
865/* skip the next 9 bytes corresponding to the frame header possibly parsed by
866 * h2_peek_frame_hdr() above.
867 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100868static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +0200869{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +0200870 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +0200871}
872
873/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +0100874static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +0200875{
876 int ret;
877
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100878 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +0200879 if (ret > 0)
880 h2_skip_frame_hdr(b);
881 return ret;
882}
883
Willy Tarreau00dd0782018-03-01 16:31:34 +0100884/* marks stream <h2s> as CLOSED and decrement the number of active streams for
885 * its connection if the stream was not yet closed. Please use this exclusively
886 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100887 */
Willy Tarreau00dd0782018-03-01 16:31:34 +0100888static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100889{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100890 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100891 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100892 if (!h2s->id)
893 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +0100894 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +0100895 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
896 h2s_notify_recv(h2s);
897 }
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100898 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100899 h2s->st = H2_SS_CLOSED;
900}
901
Willy Tarreau71049cc2018-03-28 13:56:39 +0200902/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
903static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +0100904{
905 h2s_close(h2s);
906 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +0200907 if (b_size(&h2s->rxbuf)) {
908 b_free(&h2s->rxbuf);
909 offer_buffers(NULL, tasks_run_queue);
910 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200911 if (h2s->send_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100912 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200913 if (h2s->recv_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100914 h2s->recv_wait->events &= ~SUB_RETRY_RECV;
Joseph Herlantd77575d2018-11-25 10:54:45 -0800915 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200916 * reference left would be in the h2c send_list/fctl_list, and if
917 * we're in it, we're getting out anyway
918 */
Olivier Houchardd360ac62019-03-22 17:37:16 +0100919 LIST_DEL_INIT(&h2s->list);
Willy Tarreauc234ae32019-05-13 17:56:11 +0200920 if (LIST_ADDED(&h2s->sending_list)) {
Willy Tarreau86eded62019-06-14 14:47:49 +0200921 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchard998410a2019-04-15 19:23:37 +0200922 LIST_DEL_INIT(&h2s->sending_list);
923 }
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200924 tasklet_free(h2s->wait_event.tasklet);
Willy Tarreau0a10de62018-03-01 16:27:53 +0100925 pool_free(pool_head_h2s, h2s);
926}
927
Willy Tarreaua8e49542018-10-03 18:53:55 +0200928/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
929 * stream tree. In case of error, nothing is added and NULL is returned. The
930 * causes of errors can be any failed memory allocation. The caller is
931 * responsible for checking if the connection may support an extra stream
932 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200933 */
Willy Tarreaua8e49542018-10-03 18:53:55 +0200934static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200935{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200936 struct h2s *h2s;
937
Willy Tarreaubafbe012017-11-24 17:34:44 +0100938 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200939 if (!h2s)
940 goto out;
941
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200942 h2s->wait_event.tasklet = tasklet_new();
943 if (!h2s->wait_event.tasklet) {
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200944 pool_free(pool_head_h2s, h2s);
945 goto out;
946 }
947 h2s->send_wait = NULL;
948 h2s->recv_wait = NULL;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +0200949 h2s->wait_event.tasklet->process = h2_deferred_shut;
950 h2s->wait_event.tasklet->context = h2s;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100951 h2s->wait_event.events = 0;
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200952 LIST_INIT(&h2s->list);
Olivier Houchardd360ac62019-03-22 17:37:16 +0100953 LIST_INIT(&h2s->sending_list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200954 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +0200955 h2s->cs = NULL;
Willy Tarreau5a9c8752019-08-02 07:52:08 +0200956 h2s->sws = 0;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200957 h2s->flags = H2_SF_NONE;
958 h2s->errcode = H2_ERR_NO_ERROR;
959 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200960 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +0100961 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +0200962 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +0200963
964 if (h2c->flags & H2_CF_IS_BACK) {
965 h1m_init_req(&h2s->h1m);
966 h2s->h1m.err_pos = -1; // don't care about errors on the request path
967 h2s->h1m.flags |= H1_MF_TOLOWER;
968 } else {
969 h1m_init_res(&h2s->h1m);
970 h2s->h1m.err_pos = -1; // don't care about errors on the response path
971 h2s->h1m.flags |= H1_MF_TOLOWER;
972 }
973
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200974 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +0200975 if (id > 0)
976 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100977 else
978 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200979
980 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +0100981 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100982 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +0200983
984 return h2s;
985
986 out_free_h2s:
987 pool_free(pool_head_h2s, h2s);
988 out:
989 return NULL;
990}
991
992/* creates a new stream <id> on the h2c connection and returns it, or NULL in
993 * case of memory allocation error.
994 */
995static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
996{
997 struct session *sess = h2c->conn->owner;
998 struct conn_stream *cs;
999 struct h2s *h2s;
1000
1001 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
1002 goto out;
1003
1004 h2s = h2s_new(h2c, id);
1005 if (!h2s)
1006 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001007
1008 cs = cs_new(h2c->conn);
1009 if (!cs)
1010 goto out_close;
1011
Olivier Houchard746fb772018-12-15 19:42:00 +01001012 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001013 h2s->cs = cs;
1014 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001015 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001016
1017 if (stream_create_from_cs(cs) < 0)
1018 goto out_free_cs;
1019
Willy Tarreau590a0512018-09-05 11:56:48 +02001020 /* We want the accept date presented to the next stream to be the one
1021 * we have now, the handshake time to be null (since the next stream
1022 * is not delayed by a handshake), and the idle time to count since
1023 * right now.
1024 */
1025 sess->accept_date = date;
1026 sess->tv_accept = now;
1027 sess->t_handshake = 0;
1028
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001029 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001030 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001031 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001032 return h2s;
1033
1034 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001035 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001036 cs_free(cs);
Olivier Houchard58d87f32019-05-29 16:44:17 +02001037 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001038 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001039 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001040 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001041 sess_log(sess);
1042 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001043}
1044
Willy Tarreau751f2d02018-10-05 09:35:00 +02001045/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1046 * and returns it, or NULL in case of memory allocation error or if the highest
1047 * possible stream ID was reached.
1048 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001049static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001050{
1051 struct h2s *h2s = NULL;
1052
Willy Tarreau86949782019-01-31 10:42:05 +01001053 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001054 goto out;
1055
Willy Tarreaua80dca82019-01-24 17:08:28 +01001056 if (h2_streams_left(h2c) < 1)
1057 goto out;
1058
Willy Tarreau751f2d02018-10-05 09:35:00 +02001059 /* Defer choosing the ID until we send the first message to create the stream */
1060 h2s = h2s_new(h2c, 0);
1061 if (!h2s)
1062 goto out;
1063
1064 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001065 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001066 cs->ctx = h2s;
1067 h2c->nb_cs++;
1068
Willy Tarreau751f2d02018-10-05 09:35:00 +02001069 out:
1070 return h2s;
1071}
1072
Willy Tarreaube5b7152017-09-25 16:25:39 +02001073/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1074 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1075 * the various settings codes.
1076 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001077static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001078{
1079 struct buffer *res;
1080 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001081 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001082 int mfs;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001083 int ret;
1084
1085 if (h2c_mux_busy(h2c, NULL)) {
1086 h2c->flags |= H2_CF_DEM_MBUSY;
1087 return 0;
1088 }
1089
Willy Tarreaube5b7152017-09-25 16:25:39 +02001090 chunk_init(&buf, buf_data, sizeof(buf_data));
1091 chunk_memcpy(&buf,
1092 "\x00\x00\x00" /* length : 0 for now */
1093 "\x04\x00" /* type : 4 (settings), flags : 0 */
1094 "\x00\x00\x00\x00", /* stream ID : 0 */
1095 9);
1096
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001097 if (h2c->flags & H2_CF_IS_BACK) {
1098 /* send settings_enable_push=0 */
1099 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1100 }
1101
Willy Tarreaube5b7152017-09-25 16:25:39 +02001102 if (h2_settings_header_table_size != 4096) {
1103 char str[6] = "\x00\x01"; /* header_table_size */
1104
1105 write_n32(str + 2, h2_settings_header_table_size);
1106 chunk_memcat(&buf, str, 6);
1107 }
1108
1109 if (h2_settings_initial_window_size != 65535) {
1110 char str[6] = "\x00\x04"; /* initial_window_size */
1111
1112 write_n32(str + 2, h2_settings_initial_window_size);
1113 chunk_memcat(&buf, str, 6);
1114 }
1115
1116 if (h2_settings_max_concurrent_streams != 0) {
1117 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1118
1119 /* Note: 0 means "unlimited" for haproxy's config but not for
1120 * the protocol, so never send this value!
1121 */
1122 write_n32(str + 2, h2_settings_max_concurrent_streams);
1123 chunk_memcat(&buf, str, 6);
1124 }
1125
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001126 mfs = h2_settings_max_frame_size;
1127 if (mfs > global.tune.bufsize)
1128 mfs = global.tune.bufsize;
1129
1130 if (!mfs)
1131 mfs = global.tune.bufsize;
1132
1133 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001134 char str[6] = "\x00\x05"; /* max_frame_size */
1135
1136 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1137 * match bufsize - rewrite size, but at the moment it seems
1138 * that clients don't take care of it.
1139 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001140 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001141 chunk_memcat(&buf, str, 6);
1142 }
1143
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001144 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001145
1146 res = br_tail(h2c->mbuf);
1147 retry:
1148 if (!h2_get_buf(h2c, res)) {
1149 h2c->flags |= H2_CF_MUX_MALLOC;
1150 h2c->flags |= H2_CF_DEM_MROOM;
1151 return 0;
1152 }
1153
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001154 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001155 if (unlikely(ret <= 0)) {
1156 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001157 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1158 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001159 h2c->flags |= H2_CF_MUX_MFULL;
1160 h2c->flags |= H2_CF_DEM_MROOM;
1161 return 0;
1162 }
1163 else {
1164 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1165 return 0;
1166 }
1167 }
1168 return ret;
1169}
1170
Willy Tarreau52eed752017-09-22 15:05:09 +02001171/* Try to receive a connection preface, then upon success try to send our
1172 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1173 * missing data. It may return an error in h2c.
1174 */
1175static int h2c_frt_recv_preface(struct h2c *h2c)
1176{
1177 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001178 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001179
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001180 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001181
1182 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001183 if (ret1 < 0)
1184 sess_log(h2c->conn->owner);
1185
Willy Tarreau52eed752017-09-22 15:05:09 +02001186 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn))
1187 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
1188 return 0;
1189 }
1190
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001191 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001192 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001193 b_del(&h2c->dbuf, ret1);
Willy Tarreau52eed752017-09-22 15:05:09 +02001194
Willy Tarreaube5b7152017-09-25 16:25:39 +02001195 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001196}
1197
Willy Tarreau01b44822018-10-03 14:26:37 +02001198/* Try to send a connection preface, then upon success try to send our
1199 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1200 * missing data. It may return an error in h2c.
1201 */
1202static int h2c_bck_send_preface(struct h2c *h2c)
1203{
1204 struct buffer *res;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001205 int ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001206
1207 if (h2c_mux_busy(h2c, NULL)) {
1208 h2c->flags |= H2_CF_DEM_MBUSY;
1209 return 0;
1210 }
1211
Willy Tarreaubcc45952019-05-26 10:05:50 +02001212 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001213 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001214 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001215 h2c->flags |= H2_CF_MUX_MALLOC;
1216 h2c->flags |= H2_CF_DEM_MROOM;
1217 return 0;
1218 }
1219
1220 if (!b_data(res)) {
1221 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001222 ret = b_istput(res, ist(H2_CONN_PREFACE));
1223 if (unlikely(ret <= 0)) {
1224 if (!ret) {
1225 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1226 goto retry;
1227 h2c->flags |= H2_CF_MUX_MFULL;
1228 h2c->flags |= H2_CF_DEM_MROOM;
1229 return 0;
1230 }
1231 else {
1232 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1233 return 0;
1234 }
1235 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001236 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001237 return h2c_send_settings(h2c);
1238}
1239
Willy Tarreau081d4722017-05-16 21:51:05 +02001240/* try to send a GOAWAY frame on the connection to report an error or a graceful
1241 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1242 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1243 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1244 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1245 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1246 * on unrecoverable failure. It will not attempt to send one again in this last
1247 * case so that it is safe to use h2c_error() to report such errors.
1248 */
1249static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1250{
1251 struct buffer *res;
1252 char str[17];
1253 int ret;
1254
1255 if (h2c->flags & H2_CF_GOAWAY_FAILED)
1256 return 1; // claim that it worked
1257
1258 if (h2c_mux_busy(h2c, h2s)) {
1259 if (h2s)
1260 h2s->flags |= H2_SF_BLK_MBUSY;
1261 else
1262 h2c->flags |= H2_CF_DEM_MBUSY;
1263 return 0;
1264 }
1265
Willy Tarreau9c218e72019-05-26 10:08:28 +02001266 /* len: 8, type: 7, flags: none, sid: 0 */
1267 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1268
1269 if (h2c->last_sid < 0)
1270 h2c->last_sid = h2c->max_id;
1271
1272 write_n32(str + 9, h2c->last_sid);
1273 write_n32(str + 13, h2c->errcode);
1274
Willy Tarreaubcc45952019-05-26 10:05:50 +02001275 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001276 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001277 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001278 h2c->flags |= H2_CF_MUX_MALLOC;
1279 if (h2s)
1280 h2s->flags |= H2_SF_BLK_MROOM;
1281 else
1282 h2c->flags |= H2_CF_DEM_MROOM;
1283 return 0;
1284 }
1285
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001286 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001287 if (unlikely(ret <= 0)) {
1288 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001289 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1290 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001291 h2c->flags |= H2_CF_MUX_MFULL;
1292 if (h2s)
1293 h2s->flags |= H2_SF_BLK_MROOM;
1294 else
1295 h2c->flags |= H2_CF_DEM_MROOM;
1296 return 0;
1297 }
1298 else {
1299 /* we cannot report this error using GOAWAY, so we mark
1300 * it and claim a success.
1301 */
1302 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1303 h2c->flags |= H2_CF_GOAWAY_FAILED;
1304 return 1;
1305 }
1306 }
1307 h2c->flags |= H2_CF_GOAWAY_SENT;
1308 return ret;
1309}
1310
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001311/* Try to send an RST_STREAM frame on the connection for the indicated stream
1312 * during mux operations. This stream must be valid and cannot be closed
1313 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1314 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1315 * not yet.
1316 *
1317 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1318 * to write the message, it subscribes the stream to future notifications.
1319 */
1320static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1321{
1322 struct buffer *res;
1323 char str[13];
1324 int ret;
1325
1326 if (!h2s || h2s->st == H2_SS_CLOSED)
1327 return 1;
1328
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001329 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1330 * RST_STREAM in response to a RST_STREAM frame.
1331 */
Willy Tarreaubf9a20b2019-08-06 10:01:40 +02001332 if (h2c->dsi == h2s->id && h2c->dft == H2_FT_RST_STREAM) {
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001333 ret = 1;
1334 goto ignore;
1335 }
1336
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001337 if (h2c_mux_busy(h2c, h2s)) {
1338 h2s->flags |= H2_SF_BLK_MBUSY;
1339 return 0;
1340 }
1341
Willy Tarreau9c218e72019-05-26 10:08:28 +02001342 /* len: 4, type: 3, flags: none */
1343 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1344 write_n32(str + 5, h2s->id);
1345 write_n32(str + 9, h2s->errcode);
1346
Willy Tarreaubcc45952019-05-26 10:05:50 +02001347 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001348 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001349 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001350 h2c->flags |= H2_CF_MUX_MALLOC;
1351 h2s->flags |= H2_SF_BLK_MROOM;
1352 return 0;
1353 }
1354
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001355 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001356 if (unlikely(ret <= 0)) {
1357 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001358 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1359 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001360 h2c->flags |= H2_CF_MUX_MFULL;
1361 h2s->flags |= H2_SF_BLK_MROOM;
1362 return 0;
1363 }
1364 else {
1365 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1366 return 0;
1367 }
1368 }
1369
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001370 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001371 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001372 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001373 return ret;
1374}
1375
1376/* Try to send an RST_STREAM frame on the connection for the stream being
1377 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001378 * error code, even if the stream is one of the dummy ones, and will update
1379 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001380 *
1381 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1382 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001383 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001384 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001385 */
1386static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1387{
1388 struct buffer *res;
1389 char str[13];
1390 int ret;
1391
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001392 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1393 * RST_STREAM in response to a RST_STREAM frame.
1394 */
1395 if (h2c->dft == H2_FT_RST_STREAM) {
1396 ret = 1;
1397 goto ignore;
1398 }
1399
Willy Tarreau27a84c92017-10-17 08:10:17 +02001400 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001401 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001402 return 0;
1403 }
1404
Willy Tarreau9c218e72019-05-26 10:08:28 +02001405 /* len: 4, type: 3, flags: none */
1406 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1407
1408 write_n32(str + 5, h2c->dsi);
1409 write_n32(str + 9, h2s->errcode);
1410
Willy Tarreaubcc45952019-05-26 10:05:50 +02001411 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001412 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001413 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001414 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001415 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001416 return 0;
1417 }
1418
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001419 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001420 if (unlikely(ret <= 0)) {
1421 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001422 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1423 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001424 h2c->flags |= H2_CF_MUX_MFULL;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001425 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001426 return 0;
1427 }
1428 else {
1429 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1430 return 0;
1431 }
1432 }
1433
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001434 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001435 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001436 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001437 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001438 }
1439
Willy Tarreau27a84c92017-10-17 08:10:17 +02001440 return ret;
1441}
1442
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001443/* try to send an empty DATA frame with the ES flag set to notify about the
1444 * end of stream and match a shutdown(write). If an ES was already sent as
1445 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1446 * on success or zero if nothing was done. In case of lack of room to write the
1447 * message, it subscribes the requesting stream to future notifications.
1448 */
1449static int h2_send_empty_data_es(struct h2s *h2s)
1450{
1451 struct h2c *h2c = h2s->h2c;
1452 struct buffer *res;
1453 char str[9];
1454 int ret;
1455
Willy Tarreau721c9742017-11-07 11:05:42 +01001456 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED)
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001457 return 1;
1458
1459 if (h2c_mux_busy(h2c, h2s)) {
1460 h2s->flags |= H2_SF_BLK_MBUSY;
1461 return 0;
1462 }
1463
Willy Tarreau9c218e72019-05-26 10:08:28 +02001464 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1465 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1466 write_n32(str + 5, h2s->id);
1467
Willy Tarreaubcc45952019-05-26 10:05:50 +02001468 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001469 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001470 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001471 h2c->flags |= H2_CF_MUX_MALLOC;
1472 h2s->flags |= H2_SF_BLK_MROOM;
1473 return 0;
1474 }
1475
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001476 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001477 if (likely(ret > 0)) {
1478 h2s->flags |= H2_SF_ES_SENT;
1479 }
1480 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001481 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1482 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001483 h2c->flags |= H2_CF_MUX_MFULL;
1484 h2s->flags |= H2_SF_BLK_MROOM;
1485 return 0;
1486 }
1487 else {
1488 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1489 return 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001490 }
1491 return ret;
1492}
1493
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001494/* wake a specific stream and assign its conn_stream som CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02001495 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001496 * is automatically updated accordingly. If the stream is orphaned, it is
1497 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01001498 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001499static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01001500{
1501 if (!h2s->cs) {
1502 /* this stream was already orphaned */
1503 h2s_destroy(h2s);
1504 return;
1505 }
1506
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001507 if (conn_xprt_read0_pending(h2s->h2c->conn)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001508 if (h2s->st == H2_SS_OPEN)
1509 h2s->st = H2_SS_HREM;
1510 else if (h2s->st == H2_SS_HLOC)
1511 h2s_close(h2s);
1512 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001513
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001514 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
1515 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
1516 h2s->cs->flags |= CS_FL_ERR_PENDING;
1517 if (h2s->cs->flags & CS_FL_EOS)
1518 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02001519
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001520 if (h2s->st < H2_SS_ERROR)
1521 h2s->st = H2_SS_ERROR;
1522 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01001523
1524 h2s_alert(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001525}
1526
1527/* wake the streams attached to the connection, whose id is greater than <last>
1528 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001529 */
Willy Tarreau23482912019-05-07 15:23:14 +02001530static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001531{
1532 struct eb32_node *node;
1533 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001534
Christopher Fauletf02ca002019-03-07 16:21:34 +01001535 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001536 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
1537 while (node) {
1538 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001539 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001540 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001541 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01001542
Christopher Fauletf02ca002019-03-07 16:21:34 +01001543 /* Wake all streams with unassigned ID (ID == 0) */
1544 node = eb32_lookup(&h2c->streams_by_id, 0);
1545 while (node) {
1546 h2s = container_of(node, struct h2s, by_id);
1547 if (h2s->id > 0)
1548 break;
1549 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001550 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001551 }
1552}
1553
Willy Tarreau5a9c8752019-08-02 07:52:08 +02001554/* Wake up all blocked streams whose window size has become positive after the
1555 * mux's initial window was adjusted. This should be done after having processed
1556 * SETTINGS frames which have updated the mux's initial window size.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001557 */
Willy Tarreau5a9c8752019-08-02 07:52:08 +02001558static void h2c_unblock_sfctl(struct h2c *h2c)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001559{
1560 struct h2s *h2s;
1561 struct eb32_node *node;
1562
Willy Tarreau3421aba2017-07-27 15:41:03 +02001563 node = eb32_first(&h2c->streams_by_id);
1564 while (node) {
1565 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau5a9c8752019-08-02 07:52:08 +02001566 if (h2s->flags & H2_SF_BLK_SFCTL && h2s_mws(h2s) > 0) {
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001567 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02001568 if (h2s->send_wait && !LIST_ADDED(&h2s->list))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001569 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001570 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001571 node = eb32_next(node);
1572 }
1573}
1574
1575/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
1576 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01001577 * return an error in h2c. The caller must have already verified frame length
1578 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001579 */
1580static int h2c_handle_settings(struct h2c *h2c)
1581{
1582 unsigned int offset;
1583 int error;
1584
1585 if (h2c->dff & H2_F_SETTINGS_ACK) {
1586 if (h2c->dfl) {
1587 error = H2_ERR_FRAME_SIZE_ERROR;
1588 goto fail;
1589 }
1590 return 1;
1591 }
1592
Willy Tarreau3421aba2017-07-27 15:41:03 +02001593 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001594 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001595 return 0;
1596
1597 /* parse the frame */
1598 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001599 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
1600 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001601
1602 switch (type) {
1603 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
1604 /* we need to update all existing streams with the
1605 * difference from the previous iws.
1606 */
1607 if (arg < 0) { // RFC7540#6.5.2
1608 error = H2_ERR_FLOW_CONTROL_ERROR;
1609 goto fail;
1610 }
Willy Tarreau3421aba2017-07-27 15:41:03 +02001611 h2c->miw = arg;
1612 break;
1613 case H2_SETTINGS_MAX_FRAME_SIZE:
1614 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
1615 error = H2_ERR_PROTOCOL_ERROR;
1616 goto fail;
1617 }
1618 h2c->mfs = arg;
1619 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01001620 case H2_SETTINGS_ENABLE_PUSH:
1621 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
1622 error = H2_ERR_PROTOCOL_ERROR;
1623 goto fail;
1624 }
1625 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01001626 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
1627 if (h2c->flags & H2_CF_IS_BACK) {
1628 /* the limit is only for the backend; for the frontend it is our limit */
1629 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
1630 arg = h2_settings_max_concurrent_streams;
1631 h2c->streams_limit = arg;
1632 }
1633 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001634 }
1635 }
1636
1637 /* need to ACK this frame now */
1638 h2c->st0 = H2_CS_FRAME_A;
1639 return 1;
1640 fail:
Willy Tarreau22de8d32018-09-05 19:55:58 +02001641 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001642 h2c_error(h2c, error);
1643 return 0;
1644}
1645
1646/* try to send an ACK for a settings frame on the connection. Returns > 0 on
1647 * success or one of the h2_status values.
1648 */
1649static int h2c_ack_settings(struct h2c *h2c)
1650{
1651 struct buffer *res;
1652 char str[9];
1653 int ret = -1;
1654
1655 if (h2c_mux_busy(h2c, NULL)) {
1656 h2c->flags |= H2_CF_DEM_MBUSY;
1657 return 0;
1658 }
1659
Willy Tarreau9c218e72019-05-26 10:08:28 +02001660 memcpy(str,
1661 "\x00\x00\x00" /* length : 0 (no data) */
1662 "\x04" "\x01" /* type : 4, flags : ACK */
1663 "\x00\x00\x00\x00" /* stream ID */, 9);
1664
Willy Tarreaubcc45952019-05-26 10:05:50 +02001665 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001666 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001667 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02001668 h2c->flags |= H2_CF_MUX_MALLOC;
1669 h2c->flags |= H2_CF_DEM_MROOM;
1670 return 0;
1671 }
1672
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001673 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02001674 if (unlikely(ret <= 0)) {
1675 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001676 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1677 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001678 h2c->flags |= H2_CF_MUX_MFULL;
1679 h2c->flags |= H2_CF_DEM_MROOM;
1680 return 0;
1681 }
1682 else {
1683 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1684 return 0;
1685 }
1686 }
1687 return ret;
1688}
1689
Willy Tarreaucf68c782017-10-10 17:11:41 +02001690/* processes a PING frame and schedules an ACK if needed. The caller must pass
1691 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01001692 * missing data. The caller must have already verified frame length
1693 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02001694 */
1695static int h2c_handle_ping(struct h2c *h2c)
1696{
Willy Tarreaucf68c782017-10-10 17:11:41 +02001697 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01001698 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02001699 h2c->st0 = H2_CS_FRAME_A;
1700 return 1;
1701}
1702
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001703/* Try to send a window update for stream id <sid> and value <increment>.
1704 * Returns > 0 on success or zero on missing room or failure. It may return an
1705 * error in h2c.
1706 */
1707static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
1708{
1709 struct buffer *res;
1710 char str[13];
1711 int ret = -1;
1712
1713 if (h2c_mux_busy(h2c, NULL)) {
1714 h2c->flags |= H2_CF_DEM_MBUSY;
1715 return 0;
1716 }
1717
Willy Tarreau9c218e72019-05-26 10:08:28 +02001718 /* length: 4, type: 8, flags: none */
1719 memcpy(str, "\x00\x00\x04\x08\x00", 5);
1720 write_n32(str + 5, sid);
1721 write_n32(str + 9, increment);
1722
Willy Tarreaubcc45952019-05-26 10:05:50 +02001723 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001724 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001725 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001726 h2c->flags |= H2_CF_MUX_MALLOC;
1727 h2c->flags |= H2_CF_DEM_MROOM;
1728 return 0;
1729 }
1730
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001731 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001732 if (unlikely(ret <= 0)) {
1733 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001734 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1735 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001736 h2c->flags |= H2_CF_MUX_MFULL;
1737 h2c->flags |= H2_CF_DEM_MROOM;
1738 return 0;
1739 }
1740 else {
1741 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1742 return 0;
1743 }
1744 }
1745 return ret;
1746}
1747
1748/* try to send pending window update for the connection. It's safe to call it
1749 * with no pending updates. Returns > 0 on success or zero on missing room or
1750 * failure. It may return an error in h2c.
1751 */
1752static int h2c_send_conn_wu(struct h2c *h2c)
1753{
1754 int ret = 1;
1755
1756 if (h2c->rcvd_c <= 0)
1757 return 1;
1758
Willy Tarreau97aaa672018-12-23 09:49:04 +01001759 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
1760 /* increase the advertised connection window to 2G on
1761 * first update.
1762 */
1763 h2c->flags |= H2_CF_WINDOW_OPENED;
1764 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
1765 }
1766
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001767 /* send WU for the connection */
1768 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
1769 if (ret > 0)
1770 h2c->rcvd_c = 0;
1771
1772 return ret;
1773}
1774
1775/* try to send pending window update for the current dmux stream. It's safe to
1776 * call it with no pending updates. Returns > 0 on success or zero on missing
1777 * room or failure. It may return an error in h2c.
1778 */
1779static int h2c_send_strm_wu(struct h2c *h2c)
1780{
1781 int ret = 1;
1782
1783 if (h2c->rcvd_s <= 0)
1784 return 1;
1785
1786 /* send WU for the stream */
1787 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
1788 if (ret > 0)
1789 h2c->rcvd_s = 0;
1790
1791 return ret;
1792}
1793
Willy Tarreaucf68c782017-10-10 17:11:41 +02001794/* try to send an ACK for a ping frame on the connection. Returns > 0 on
1795 * success, 0 on missing data or one of the h2_status values.
1796 */
1797static int h2c_ack_ping(struct h2c *h2c)
1798{
1799 struct buffer *res;
1800 char str[17];
1801 int ret = -1;
1802
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001803 if (b_data(&h2c->dbuf) < 8)
Willy Tarreaucf68c782017-10-10 17:11:41 +02001804 return 0;
1805
1806 if (h2c_mux_busy(h2c, NULL)) {
1807 h2c->flags |= H2_CF_DEM_MBUSY;
1808 return 0;
1809 }
1810
Willy Tarreaucf68c782017-10-10 17:11:41 +02001811 memcpy(str,
1812 "\x00\x00\x08" /* length : 8 (same payload) */
1813 "\x06" "\x01" /* type : 6, flags : ACK */
1814 "\x00\x00\x00\x00" /* stream ID */, 9);
1815
1816 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001817 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02001818
Willy Tarreau9c218e72019-05-26 10:08:28 +02001819 res = br_tail(h2c->mbuf);
1820 retry:
1821 if (!h2_get_buf(h2c, res)) {
1822 h2c->flags |= H2_CF_MUX_MALLOC;
1823 h2c->flags |= H2_CF_DEM_MROOM;
1824 return 0;
1825 }
1826
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001827 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02001828 if (unlikely(ret <= 0)) {
1829 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001830 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1831 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02001832 h2c->flags |= H2_CF_MUX_MFULL;
1833 h2c->flags |= H2_CF_DEM_MROOM;
1834 return 0;
1835 }
1836 else {
1837 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1838 return 0;
1839 }
1840 }
1841 return ret;
1842}
1843
Willy Tarreau26f95952017-07-27 17:18:30 +02001844/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
1845 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01001846 * h2c or h2s. The caller must have already verified frame length and stream ID
1847 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02001848 */
1849static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
1850{
1851 int32_t inc;
1852 int error;
1853
Willy Tarreau26f95952017-07-27 17:18:30 +02001854 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001855 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau26f95952017-07-27 17:18:30 +02001856 return 0;
1857
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001858 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02001859
1860 if (h2c->dsi != 0) {
1861 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02001862
1863 /* it's not an error to receive WU on a closed stream */
1864 if (h2s->st == H2_SS_CLOSED)
1865 return 1;
1866
1867 if (!inc) {
1868 error = H2_ERR_PROTOCOL_ERROR;
1869 goto strm_err;
1870 }
1871
Willy Tarreau5a9c8752019-08-02 07:52:08 +02001872 if (h2s_mws(h2s) >= 0 && h2s_mws(h2s) + inc < 0) {
Willy Tarreau26f95952017-07-27 17:18:30 +02001873 error = H2_ERR_FLOW_CONTROL_ERROR;
1874 goto strm_err;
1875 }
1876
Willy Tarreau5a9c8752019-08-02 07:52:08 +02001877 h2s->sws += inc;
1878 if (h2s_mws(h2s) > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
Willy Tarreau26f95952017-07-27 17:18:30 +02001879 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02001880 if (h2s->send_wait && !LIST_ADDED(&h2s->list))
Olivier Houcharddddfe312018-10-10 18:51:00 +02001881 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02001882 }
1883 }
1884 else {
1885 /* connection window update */
1886 if (!inc) {
1887 error = H2_ERR_PROTOCOL_ERROR;
1888 goto conn_err;
1889 }
1890
1891 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
1892 error = H2_ERR_FLOW_CONTROL_ERROR;
1893 goto conn_err;
1894 }
1895
1896 h2c->mws += inc;
1897 }
1898
1899 return 1;
1900
1901 conn_err:
1902 h2c_error(h2c, error);
1903 return 0;
1904
1905 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01001906 h2s_error(h2s, error);
1907 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau26f95952017-07-27 17:18:30 +02001908 return 0;
1909}
1910
Willy Tarreaue96b0922017-10-30 00:28:29 +01001911/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01001912 * the last ID. Returns > 0 on success or zero on missing data. The caller must
1913 * have already verified frame length and stream ID validity. Described in
1914 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01001915 */
1916static int h2c_handle_goaway(struct h2c *h2c)
1917{
Willy Tarreaue96b0922017-10-30 00:28:29 +01001918 int last;
1919
Willy Tarreaue96b0922017-10-30 00:28:29 +01001920 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001921 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreaue96b0922017-10-30 00:28:29 +01001922 return 0;
1923
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001924 last = h2_get_n32(&h2c->dbuf, 0);
1925 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01001926 if (h2c->last_sid < 0)
1927 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02001928 h2_wake_some_streams(h2c, last);
Willy Tarreaue96b0922017-10-30 00:28:29 +01001929 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01001930}
1931
Willy Tarreau92153fc2017-12-03 19:46:19 +01001932/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01001933 * invalid. Returns > 0 on success or zero on missing data. It may return an
1934 * error in h2c. The caller must have already verified frame length and stream
1935 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01001936 */
1937static int h2c_handle_priority(struct h2c *h2c)
1938{
Willy Tarreau92153fc2017-12-03 19:46:19 +01001939 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001940 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau92153fc2017-12-03 19:46:19 +01001941 return 0;
1942
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001943 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01001944 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01001945 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
1946 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01001947 }
1948 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01001949}
1950
Willy Tarreaucd234e92017-08-18 10:59:39 +02001951/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01001952 * Returns > 0 on success or zero on missing data. The caller must have already
1953 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02001954 */
1955static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
1956{
Willy Tarreaucd234e92017-08-18 10:59:39 +02001957 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001958 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreaucd234e92017-08-18 10:59:39 +02001959 return 0;
1960
1961 /* late RST, already handled */
1962 if (h2s->st == H2_SS_CLOSED)
1963 return 1;
1964
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001965 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01001966 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02001967
1968 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01001969 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01001970 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02001971 }
1972
1973 h2s->flags |= H2_SF_RST_RCVD;
1974 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02001975}
1976
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001977/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
1978 * It may return an error in h2c or h2s. The caller must consider that the
1979 * return value is the new h2s in case one was allocated (most common case).
1980 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02001981 * errors here are reported as connection errors since it's impossible to
1982 * recover from such errors after the compression context has been altered.
1983 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001984static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02001985{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01001986 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01001987 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01001988 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02001989 int error;
1990
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001991 if (!b_size(&h2c->dbuf))
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001992 return NULL; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02001993
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001994 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001995 return NULL; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02001996
1997 /* now either the frame is complete or the buffer is complete */
1998 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01001999 /* The stream exists/existed, this must be a trailers frame */
2000 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02002001 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2002 /* unrecoverable error ? */
2003 if (h2c->st0 >= H2_CS_ERROR)
2004 goto out;
2005
2006 if (error == 0)
2007 goto out; // missing data
2008
2009 if (error < 0) {
2010 /* Failed to decode this frame (e.g. too large request)
2011 * but the HPACK decompressor is still synchronized.
2012 */
2013 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2014 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002015 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002016 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002017 goto done;
2018 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002019 /* the connection was already killed by an RST, let's consume
2020 * the data and send another RST.
2021 */
2022 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2023 h2s = (struct h2s*)h2_error_stream;
2024 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002025 }
2026 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2027 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2028 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002029 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002030 goto conn_err;
2031 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002032 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2033 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002034
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002035 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002036
Willy Tarreau25919232019-01-03 14:48:18 +01002037 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002038 if (h2c->st0 >= H2_CS_ERROR)
2039 goto out;
2040
Willy Tarreau25919232019-01-03 14:48:18 +01002041 if (error <= 0) {
2042 if (error == 0)
2043 goto out; // missing data
2044
2045 /* Failed to decode this stream (e.g. too large request)
2046 * but the HPACK decompressor is still synchronized.
2047 */
2048 h2s = (struct h2s*)h2_error_stream;
2049 goto send_rst;
2050 }
2051
Willy Tarreau22de8d32018-09-05 19:55:58 +02002052 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002053 * positively from h2c_frt_stream_new(), the stream will report the error,
2054 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002055 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002056 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002057 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002058 h2s = (struct h2s*)h2_refused_stream;
2059 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002060 }
2061
2062 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002063 h2s->rxbuf = rxbuf;
2064 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002065 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002066
Willy Tarreau88d138e2019-01-02 19:38:14 +01002067 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002068 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002069 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002070
2071 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002072 if (h2s->st == H2_SS_OPEN)
2073 h2s->st = H2_SS_HREM;
2074 else
2075 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002076 }
2077
Willy Tarreau3a429f02019-01-03 11:41:50 +01002078 /* update the max stream ID if the request is being processed */
2079 if (h2s->id > h2c->max_id)
2080 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002081
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002082 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002083
2084 conn_err:
2085 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002086 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002087
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002088 out:
2089 h2_release_buf(h2c, &rxbuf);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002090 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002091
2092 send_rst:
2093 /* make the demux send an RST for the current stream. We may only
2094 * do this if we're certain that the HEADERS frame was properly
2095 * decompressed so that the HPACK decoder is still kept up to date.
2096 */
2097 h2_release_buf(h2c, &rxbuf);
2098 h2c->st0 = H2_CS_FRAME_E;
2099 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002100}
2101
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002102/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2103 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2104 * errors here are reported as connection errors since it's impossible to
2105 * recover from such errors after the compression context has been altered.
2106 */
2107static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2108{
Christopher Faulet96b88f22019-09-23 15:28:20 +02002109 struct buffer rxbuf = BUF_NULL;
2110 unsigned long long body_len = 0;
2111 uint32_t flags = 0;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002112 int error;
2113
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002114 if (!b_size(&h2c->dbuf))
2115 return NULL; // empty buffer
2116
2117 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
2118 return NULL; // incomplete frame
2119
Christopher Faulet96b88f22019-09-23 15:28:20 +02002120 if (h2s->st != H2_SS_CLOSED) {
2121 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
2122 }
2123 else {
2124 /* the connection was already killed by an RST, let's consume
2125 * the data and send another RST.
2126 */
2127 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2128 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2129 h2c->st0 = H2_CS_FRAME_E;
2130 goto send_rst;
2131 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002132
Willy Tarreau25919232019-01-03 14:48:18 +01002133 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002134 if (h2c->st0 >= H2_CS_ERROR)
2135 return NULL;
2136
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002137 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2138 /* RFC7540#5.1 */
2139 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2140 h2c->st0 = H2_CS_FRAME_E;
2141 return NULL;
2142 }
2143
Willy Tarreau25919232019-01-03 14:48:18 +01002144 if (error <= 0) {
2145 if (error == 0)
2146 return NULL; // missing data
2147
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002148 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002149 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002150 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau25919232019-01-03 14:48:18 +01002151 return NULL;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002152 }
2153
Christopher Fauletfa922f02019-05-07 10:55:17 +02002154 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002155 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002156
Willy Tarreau927b88b2019-03-04 08:03:25 +01002157 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002158 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002159 else if (h2s->flags & H2_SF_ES_RCVD) {
2160 if (h2s->st == H2_SS_OPEN)
2161 h2s->st = H2_SS_HREM;
2162 else if (h2s->st == H2_SS_HLOC)
2163 h2s_close(h2s);
2164 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002165
2166 return h2s;
Christopher Faulet96b88f22019-09-23 15:28:20 +02002167
2168 send_rst:
2169 /* make the demux send an RST for the current stream. We may only
2170 * do this if we're certain that the HEADERS frame was properly
2171 * decompressed so that the HPACK decoder is still kept up to date.
2172 */
2173 h2_release_buf(h2c, &rxbuf);
2174 h2c->st0 = H2_CS_FRAME_E;
2175 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002176}
2177
Willy Tarreau454f9052017-10-26 19:40:35 +02002178/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2179 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2180 */
2181static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2182{
2183 int error;
2184
2185 /* note that empty DATA frames are perfectly valid and sometimes used
2186 * to signal an end of stream (with the ES flag).
2187 */
2188
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002189 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau454f9052017-10-26 19:40:35 +02002190 return 0; // empty buffer
2191
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002192 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau454f9052017-10-26 19:40:35 +02002193 return 0; // incomplete frame
2194
2195 /* now either the frame is complete or the buffer is complete */
2196
Willy Tarreau454f9052017-10-26 19:40:35 +02002197 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2198 /* RFC7540#6.1 */
2199 error = H2_ERR_STREAM_CLOSED;
2200 goto strm_err;
2201 }
2202
Christopher Faulet4fb65f42019-06-19 09:25:58 +02002203 if ((h2s->flags & H2_SF_DATA_CLEN) && (h2c->dfl - h2c->dpl) > h2s->body_len) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01002204 /* RFC7540#8.1.2 */
2205 error = H2_ERR_PROTOCOL_ERROR;
2206 goto strm_err;
2207 }
2208
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002209 if (!h2_frt_transfer_data(h2s))
2210 return 0;
2211
Willy Tarreau454f9052017-10-26 19:40:35 +02002212 /* call the upper layers to process the frame, then let the upper layer
2213 * notify the stream about any change.
2214 */
2215 if (!h2s->cs) {
Willy Tarreauc1a29652019-08-06 10:11:02 +02002216 /* The upper layer has already closed, this may happen on
2217 * 4xx/redirects during POST, or when receiving a response
2218 * from an H2 server after the client has aborted.
2219 */
2220 error = H2_ERR_CANCEL;
Willy Tarreau454f9052017-10-26 19:40:35 +02002221 goto strm_err;
2222 }
2223
Willy Tarreau8f650c32017-11-21 19:36:21 +01002224 if (h2c->st0 >= H2_CS_ERROR)
2225 return 0;
2226
Willy Tarreau721c9742017-11-07 11:05:42 +01002227 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002228 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002229 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002230 }
2231
2232 /* check for completion : the callee will change this to FRAME_A or
2233 * FRAME_H once done.
2234 */
2235 if (h2c->st0 == H2_CS_FRAME_P)
2236 return 0;
2237
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002238 /* last frame */
2239 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002240 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002241 if (h2s->st == H2_SS_OPEN)
2242 h2s->st = H2_SS_HREM;
2243 else
2244 h2s_close(h2s);
2245
Willy Tarreau1915ca22019-01-24 11:49:37 +01002246 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2247 /* RFC7540#8.1.2 */
2248 error = H2_ERR_PROTOCOL_ERROR;
2249 goto strm_err;
2250 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002251 }
2252
Willy Tarreau454f9052017-10-26 19:40:35 +02002253 return 1;
2254
Willy Tarreau454f9052017-10-26 19:40:35 +02002255 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002256 h2s_error(h2s, error);
2257 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002258 return 0;
2259}
2260
Willy Tarreaubc933932017-10-09 16:21:43 +02002261/* process Rx frames to be demultiplexed */
2262static void h2_process_demux(struct h2c *h2c)
2263{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002264 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002265 struct h2_fh hdr;
2266 unsigned int padlen = 0;
Willy Tarreau5a9c8752019-08-02 07:52:08 +02002267 int32_t old_iw = h2c->miw;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02002268
Willy Tarreau081d4722017-05-16 21:51:05 +02002269 if (h2c->st0 >= H2_CS_ERROR)
2270 return;
Willy Tarreau52eed752017-09-22 15:05:09 +02002271
2272 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2273 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau01b44822018-10-03 14:26:37 +02002274 if (h2c->flags & H2_CF_IS_BACK)
2275 return;
Willy Tarreau52eed752017-09-22 15:05:09 +02002276 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
2277 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002278 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau52eed752017-09-22 15:05:09 +02002279 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002280 sess_log(h2c->conn->owner);
2281 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002282 goto fail;
2283 }
2284
2285 h2c->max_id = 0;
2286 h2c->st0 = H2_CS_SETTINGS1;
2287 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002288
2289 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002290 /* ensure that what is pending is a valid SETTINGS frame
2291 * without an ACK.
2292 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002293 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002294 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002295 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002296 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002297 sess_log(h2c->conn->owner);
2298 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002299 goto fail;
2300 }
2301
2302 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
2303 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2304 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2305 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002306 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002307 goto fail;
2308 }
2309
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002310 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002311 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2312 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2313 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002314 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002315 goto fail;
2316 }
2317
Willy Tarreau3bf69182018-12-21 15:34:50 +01002318 /* that's OK, switch to FRAME_P to process it. This is
2319 * a SETTINGS frame whose header has already been
2320 * deleted above.
2321 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01002322 padlen = 0;
2323 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002324 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002325 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002326
2327 /* process as many incoming frames as possible below */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002328 while (b_data(&h2c->dbuf)) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002329 int ret = 0;
2330
2331 if (h2c->st0 >= H2_CS_ERROR)
2332 break;
2333
2334 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreauab3ebbc2019-08-06 15:49:51 +02002335 h2c->rcvd_s = 0;
2336
Willy Tarreaua4428bd2018-12-22 18:11:41 +01002337 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02002338 break;
2339
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002340 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002341 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002342 if (!h2c->nb_streams) {
2343 /* only log if no other stream can report the error */
2344 sess_log(h2c->conn->owner);
2345 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002346 break;
2347 }
2348
Christopher Faulet3d574a52019-06-18 12:22:38 +02002349 padlen = 0;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002350 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
2351 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
2352 * we read the pad length and drop it from the remaining
2353 * payload (one byte + the 9 remaining ones = 10 total
2354 * removed), so we have a frame payload starting after the
2355 * pad len. Flow controlled frames (DATA) also count the
2356 * padlen in the flow control, so it must be adjusted.
2357 */
2358 if (hdr.len < 1) {
2359 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2360 sess_log(h2c->conn->owner);
2361 goto fail;
2362 }
2363 hdr.len--;
2364
2365 if (b_data(&h2c->dbuf) < 10)
2366 break; // missing padlen
2367
2368 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
2369
2370 if (padlen > hdr.len) {
2371 /* RFC7540#6.1 : pad length = length of
2372 * frame payload or greater => error.
2373 */
2374 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2375 sess_log(h2c->conn->owner);
2376 goto fail;
2377 }
2378
2379 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
2380 h2c->rcvd_c++;
2381 h2c->rcvd_s++;
2382 }
2383 b_del(&h2c->dbuf, 1);
2384 }
2385 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01002386
2387 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02002388 h2c->dfl = hdr.len;
2389 h2c->dsi = hdr.sid;
2390 h2c->dft = hdr.ft;
2391 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002392 h2c->dpl = padlen;
Willy Tarreau7e98c052017-10-10 15:56:59 +02002393 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002394
2395 /* check for minimum basic frame format validity */
2396 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
2397 if (ret != H2_ERR_NO_ERROR) {
2398 h2c_error(h2c, ret);
2399 sess_log(h2c->conn->owner);
2400 goto fail;
2401 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002402 }
2403
Willy Tarreaubde2f0a2019-08-06 15:21:45 +02002404 /* Only H2_CS_FRAME_P, H2_CS_FRAME_A and H2_CS_FRAME_E here.
2405 * H2_CS_FRAME_P indicates an incomplete previous operation
2406 * (most often the first attempt) and requires some validity
2407 * checks for the frame and the current state. The two other
2408 * ones are set after completion (or abortion) and must skip
2409 * validity checks.
2410 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002411 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
2412
Willy Tarreau567beb82018-12-18 16:52:44 +01002413 if (tmp_h2s != h2s && h2s && h2s->cs &&
2414 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02002415 conn_xprt_read0_pending(h2c->conn) ||
2416 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02002417 (h2s->flags & H2_SF_ES_RCVD) ||
2418 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002419 /* we may have to signal the upper layers */
2420 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01002421 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002422 }
2423 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02002424
Willy Tarreaud7901432017-12-29 11:34:40 +01002425 if (h2c->st0 == H2_CS_FRAME_E)
2426 goto strm_err;
2427
Willy Tarreaubde2f0a2019-08-06 15:21:45 +02002428 if (h2c->st0 == H2_CS_FRAME_A)
2429 goto valid_frame_type;
2430
Willy Tarreauf65b80d2017-10-30 11:46:49 +01002431 if (h2s->st == H2_SS_IDLE &&
2432 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2433 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2434 * this state MUST be treated as a connection error
2435 */
2436 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002437 if (!h2c->nb_streams) {
2438 /* only log if no other stream can report the error */
2439 sess_log(h2c->conn->owner);
2440 }
Willy Tarreauf65b80d2017-10-30 11:46:49 +01002441 break;
2442 }
2443
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002444 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2445 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2446 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
Willy Tarreau5b4eae32019-01-24 09:43:32 +01002447 * this state MUST be treated as a stream error.
2448 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2449 * PUSH_PROMISE/CONTINUATION cause connection errors.
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002450 */
Willy Tarreau5b4eae32019-01-24 09:43:32 +01002451 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)
2452 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2453 else
2454 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002455 goto strm_err;
2456 }
2457
Willy Tarreauab837502017-12-27 15:07:30 +01002458 /* Below the management of frames received in closed state is a
2459 * bit hackish because the spec makes strong differences between
2460 * streams closed by receiving RST, sending RST, and seeing ES
2461 * in both directions. In addition to this, the creation of a
2462 * new stream reusing the identifier of a closed one will be
2463 * detected here. Given that we cannot keep track of all closed
2464 * streams forever, we consider that unknown closed streams were
2465 * closed on RST received, which allows us to respond with an
2466 * RST without breaking the connection (eg: to abort a transfer).
2467 * Some frames have to be silently ignored as well.
2468 */
2469 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
Willy Tarreau3ad5d312019-01-29 18:33:26 +01002470 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreauab837502017-12-27 15:07:30 +01002471 /* #5.1.1: The identifier of a newly
2472 * established stream MUST be numerically
2473 * greater than all streams that the initiating
2474 * endpoint has opened or reserved. This
2475 * governs streams that are opened using a
2476 * HEADERS frame and streams that are reserved
2477 * using PUSH_PROMISE. An endpoint that
2478 * receives an unexpected stream identifier
2479 * MUST respond with a connection error.
2480 */
2481 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
2482 goto strm_err;
2483 }
2484
Christopher Faulet96b88f22019-09-23 15:28:20 +02002485 if (h2s->flags & H2_SF_RST_RCVD && !(h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)) {
Willy Tarreauab837502017-12-27 15:07:30 +01002486 /* RFC7540#5.1:closed: an endpoint that
2487 * receives any frame other than PRIORITY after
2488 * receiving a RST_STREAM MUST treat that as a
2489 * stream error of type STREAM_CLOSED.
2490 *
2491 * Note that old streams fall into this category
2492 * and will lead to an RST being sent.
Willy Tarreau8d9ac3e2019-01-30 16:58:30 +01002493 *
2494 * However, we cannot generalize this to all frame types. Those
2495 * carrying compression state must still be processed before
2496 * being dropped or we'll desynchronize the decoder. This can
2497 * happen with request trailers received after sending an
2498 * RST_STREAM, or with header/trailers responses received after
2499 * sending RST_STREAM (aborted stream).
Willy Tarreauab837502017-12-27 15:07:30 +01002500 */
2501 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2502 h2c->st0 = H2_CS_FRAME_E;
2503 goto strm_err;
2504 }
2505
2506 /* RFC7540#5.1:closed: if this state is reached as a
2507 * result of sending a RST_STREAM frame, the peer that
2508 * receives the RST_STREAM might have already sent
2509 * frames on the stream that cannot be withdrawn. An
2510 * endpoint MUST ignore frames that it receives on
2511 * closed streams after it has sent a RST_STREAM
2512 * frame. An endpoint MAY choose to limit the period
2513 * over which it ignores frames and treat frames that
2514 * arrive after this time as being in error.
2515 */
Willy Tarreau24ff1f82019-01-30 19:20:09 +01002516 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
Willy Tarreauab837502017-12-27 15:07:30 +01002517 /* RFC7540#5.1:closed: any frame other than
2518 * PRIO/WU/RST in this state MUST be treated as
2519 * a connection error
2520 */
2521 if (h2c->dft != H2_FT_RST_STREAM &&
2522 h2c->dft != H2_FT_PRIORITY &&
2523 h2c->dft != H2_FT_WINDOW_UPDATE) {
2524 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
2525 goto strm_err;
2526 }
2527 }
2528 }
2529
Willy Tarreauc0da1962017-10-30 18:38:00 +01002530#if 0
2531 // problem below: it is not possible to completely ignore such
2532 // streams as we need to maintain the compression state as well
2533 // and for this we need to completely process these frames (eg:
2534 // HEADERS frames) as well as counting DATA frames to emit
2535 // proper WINDOW UPDATES and ensure the connection doesn't stall.
2536 // This is a typical case of layer violation where the
2537 // transported contents are critical to the connection's
2538 // validity and must be ignored at the same time :-(
2539
2540 /* graceful shutdown, ignore streams whose ID is higher than
2541 * the one advertised in GOAWAY. RFC7540#6.8.
2542 */
2543 if (unlikely(h2c->last_sid >= 0) && h2c->dsi > h2c->last_sid) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002544 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
2545 b_del(&h2c->dbuf, ret);
Willy Tarreauc0da1962017-10-30 18:38:00 +01002546 h2c->dfl -= ret;
2547 ret = h2c->dfl == 0;
2548 goto strm_err;
2549 }
2550#endif
2551
Willy Tarreaubde2f0a2019-08-06 15:21:45 +02002552 valid_frame_type:
Willy Tarreau7e98c052017-10-10 15:56:59 +02002553 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002554 case H2_FT_SETTINGS:
2555 if (h2c->st0 == H2_CS_FRAME_P)
2556 ret = h2c_handle_settings(h2c);
2557
2558 if (h2c->st0 == H2_CS_FRAME_A)
2559 ret = h2c_ack_settings(h2c);
2560 break;
2561
Willy Tarreaucf68c782017-10-10 17:11:41 +02002562 case H2_FT_PING:
2563 if (h2c->st0 == H2_CS_FRAME_P)
2564 ret = h2c_handle_ping(h2c);
2565
2566 if (h2c->st0 == H2_CS_FRAME_A)
2567 ret = h2c_ack_ping(h2c);
2568 break;
2569
Willy Tarreau26f95952017-07-27 17:18:30 +02002570 case H2_FT_WINDOW_UPDATE:
2571 if (h2c->st0 == H2_CS_FRAME_P)
2572 ret = h2c_handle_window_update(h2c, h2s);
2573 break;
2574
Willy Tarreau61290ec2017-10-17 08:19:21 +02002575 case H2_FT_CONTINUATION:
Willy Tarreauea18f862018-12-22 20:19:26 +01002576 /* RFC7540#6.10: CONTINUATION may only be preceeded by
2577 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
2578 * frames' parsers consume all following CONTINUATION
2579 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02002580 */
Willy Tarreauea18f862018-12-22 20:19:26 +01002581 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2582 sess_log(h2c->conn->owner);
2583 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02002584
Willy Tarreau13278b42017-10-13 19:23:14 +02002585 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002586 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002587 if (h2c->flags & H2_CF_IS_BACK)
2588 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
2589 else
2590 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002591 if (tmp_h2s) {
2592 h2s = tmp_h2s;
2593 ret = 1;
2594 }
2595 }
Willy Tarreau13278b42017-10-13 19:23:14 +02002596 break;
2597
Willy Tarreau454f9052017-10-26 19:40:35 +02002598 case H2_FT_DATA:
2599 if (h2c->st0 == H2_CS_FRAME_P)
2600 ret = h2c_frt_handle_data(h2c, h2s);
2601
2602 if (h2c->st0 == H2_CS_FRAME_A)
2603 ret = h2c_send_strm_wu(h2c);
2604 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002605
Willy Tarreau92153fc2017-12-03 19:46:19 +01002606 case H2_FT_PRIORITY:
2607 if (h2c->st0 == H2_CS_FRAME_P)
2608 ret = h2c_handle_priority(h2c);
2609 break;
2610
Willy Tarreaucd234e92017-08-18 10:59:39 +02002611 case H2_FT_RST_STREAM:
2612 if (h2c->st0 == H2_CS_FRAME_P)
2613 ret = h2c_handle_rst_stream(h2c, h2s);
2614 break;
2615
Willy Tarreaue96b0922017-10-30 00:28:29 +01002616 case H2_FT_GOAWAY:
2617 if (h2c->st0 == H2_CS_FRAME_P)
2618 ret = h2c_handle_goaway(h2c);
2619 break;
2620
Willy Tarreau1c661982017-10-30 13:52:01 +01002621 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02002622 default:
2623 /* drop frames that we ignore. They may be larger than
2624 * the buffer so we drain all of their contents until
2625 * we reach the end.
2626 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002627 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
2628 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002629 h2c->dfl -= ret;
2630 ret = h2c->dfl == 0;
2631 }
2632
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002633 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01002634 /* We may have to send an RST if not done yet */
2635 if (h2s->st == H2_SS_ERROR)
2636 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau27a84c92017-10-17 08:10:17 +02002637
Willy Tarreaua20a5192017-12-27 11:02:06 +01002638 if (h2c->st0 == H2_CS_FRAME_E)
2639 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02002640
Willy Tarreau7e98c052017-10-10 15:56:59 +02002641 /* error or missing data condition met above ? */
Willy Tarreau1ed87b72018-11-25 08:45:16 +01002642 if (ret <= 0)
Willy Tarreau7e98c052017-10-10 15:56:59 +02002643 break;
2644
2645 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002646 b_del(&h2c->dbuf, h2c->dfl);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002647 h2c->st0 = H2_CS_FRAME_H;
2648 }
2649 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002650
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002651 if (h2c->rcvd_c > 0 &&
2652 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM)))
2653 h2c_send_conn_wu(h2c);
2654
Willy Tarreau52eed752017-09-22 15:05:09 +02002655 fail:
2656 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01002657 if (h2s && h2s->cs &&
2658 (b_data(&h2s->rxbuf) ||
Willy Tarreau76c83822019-06-15 09:55:50 +02002659 conn_xprt_read0_pending(h2c->conn) ||
2660 h2s->st == H2_SS_CLOSED ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02002661 (h2s->flags & H2_SF_ES_RCVD) ||
2662 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002663 /* we may have to signal the upper layers */
2664 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01002665 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002666 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01002667
Willy Tarreau5a9c8752019-08-02 07:52:08 +02002668 if (old_iw != h2c->miw)
2669 h2c_unblock_sfctl(h2c);
2670
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02002671 h2c_restart_reading(h2c, 0);
Willy Tarreaubc933932017-10-09 16:21:43 +02002672}
2673
2674/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
2675 * the end.
2676 */
2677static int h2_process_mux(struct h2c *h2c)
2678{
Olivier Houchard998410a2019-04-15 19:23:37 +02002679 struct h2s *h2s, *h2s_back;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002680
Willy Tarreau01b44822018-10-03 14:26:37 +02002681 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2682 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
2683 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
2684 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2685 if (h2c->st0 == H2_CS_ERROR) {
2686 h2c->st0 = H2_CS_ERROR2;
2687 sess_log(h2c->conn->owner);
2688 }
2689 goto fail;
2690 }
2691 h2c->st0 = H2_CS_SETTINGS1;
2692 }
2693 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01002694 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau01b44822018-10-03 14:26:37 +02002695 return 1;
2696 }
2697
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002698 /* start by sending possibly pending window updates */
Willy Tarreau9c497c22019-08-06 15:39:32 +02002699 if (h2c->rcvd_s > 0 &&
2700 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
2701 h2c_send_strm_wu(h2c) < 0)
2702 goto fail;
2703
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002704 if (h2c->rcvd_c > 0 &&
2705 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
2706 h2c_send_conn_wu(h2c) < 0)
2707 goto fail;
2708
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002709 /* First we always process the flow control list because the streams
2710 * waiting there were already elected for immediate emission but were
2711 * blocked just on this.
2712 */
2713
Olivier Houchard998410a2019-04-15 19:23:37 +02002714 list_for_each_entry_safe(h2s, h2s_back, &h2c->fctl_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002715 if (h2c->mws <= 0 || h2c->flags & H2_CF_MUX_BLOCK_ANY ||
2716 h2c->st0 >= H2_CS_ERROR)
2717 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002718
Willy Tarreauc234ae32019-05-13 17:56:11 +02002719 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002720 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002721
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002722 h2s->flags &= ~H2_SF_BLK_ANY;
Olivier Houchard998410a2019-04-15 19:23:37 +02002723 /* For some reason, the upper layer failed to subsribe again,
2724 * so remove it from the send_list
2725 */
2726 if (!h2s->send_wait) {
2727 LIST_DEL_INIT(&h2s->list);
2728 continue;
2729 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002730 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01002731 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02002732 tasklet_wakeup(h2s->send_wait->tasklet);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002733 }
2734
Olivier Houchard998410a2019-04-15 19:23:37 +02002735 list_for_each_entry_safe(h2s, h2s_back, &h2c->send_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002736 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
2737 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002738
Willy Tarreauc234ae32019-05-13 17:56:11 +02002739 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002740 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002741
Olivier Houchard998410a2019-04-15 19:23:37 +02002742 /* For some reason, the upper layer failed to subsribe again,
2743 * so remove it from the send_list
2744 */
2745 if (!h2s->send_wait) {
2746 LIST_DEL_INIT(&h2s->list);
2747 continue;
2748 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002749 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002750 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01002751 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02002752 tasklet_wakeup(h2s->send_wait->tasklet);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002753 }
2754
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002755 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01002756 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02002757 if (h2c->st0 == H2_CS_ERROR) {
2758 if (h2c->max_id >= 0) {
2759 h2c_send_goaway_error(h2c, NULL);
2760 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
2761 return 0;
2762 }
2763
2764 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
2765 }
2766 return 1;
2767 }
Olivier Houchardd360ac62019-03-22 17:37:16 +01002768 return (1);
Willy Tarreaubc933932017-10-09 16:21:43 +02002769}
2770
Willy Tarreau62f52692017-10-08 23:01:42 +02002771
Willy Tarreau479998a2018-11-18 06:30:59 +01002772/* Attempt to read data, and subscribe if none available.
2773 * The function returns 1 if data has been received, otherwise zero.
2774 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002775static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002776{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02002777 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02002778 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002779 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02002780 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002781
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002782 if (h2c->wait_event.events & SUB_RETRY_RECV)
Olivier Houchard81a15af2018-10-19 17:26:49 +02002783 return (b_data(&h2c->dbuf));
Olivier Houchardaf4021e2018-08-09 13:06:55 +02002784
Willy Tarreau315d8072017-12-10 22:17:57 +01002785 if (!h2_recv_allowed(h2c))
Olivier Houchard81a15af2018-10-19 17:26:49 +02002786 return 1;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002787
Willy Tarreau44e973f2018-03-01 17:49:30 +01002788 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02002789 if (!buf) {
2790 h2c->flags |= H2_CF_DEM_DALLOC;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002791 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02002792 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02002793
Olivier Houchard7505f942018-08-21 18:10:44 +02002794 do {
Willy Tarreaue0f24ee2018-12-14 10:51:23 +01002795 b_realign_if_empty(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01002796 if (!b_data(buf) && (h2c->proxy->options2 & PR_O2_USE_HTX)) {
2797 /* HTX in use : try to pre-align the buffer like the
2798 * rxbufs will be to optimize memory copies. We'll make
2799 * sure that the frame header lands at the end of the
2800 * HTX block to alias it upon recv. We cannot use the
2801 * head because rcv_buf() will realign the buffer if
2802 * it's empty. Thus we cheat and pretend we already
2803 * have a few bytes there.
2804 */
2805 max = buf_room_for_htx_data(buf) + 9;
Willy Tarreauc0960d12018-12-14 10:59:15 +01002806 buf->head = sizeof(struct htx) - 9;
Willy Tarreau2a59e872018-12-12 08:23:47 +01002807 }
2808 else
2809 max = b_room(buf);
2810
Olivier Houchard7505f942018-08-21 18:10:44 +02002811 if (max)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002812 ret = conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0);
Olivier Houchard7505f942018-08-21 18:10:44 +02002813 else
2814 ret = 0;
2815 } while (ret > 0);
Willy Tarreaua2af5122017-10-09 11:56:46 +02002816
Willy Tarreaua8fcdac2019-08-02 07:48:47 +02002817 if (max && !ret && h2_recv_allowed(h2c))
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002818 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Olivier Houchard81a15af2018-10-19 17:26:49 +02002819
Olivier Houcharda1411e62018-08-17 18:42:48 +02002820 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01002821 h2_release_buf(h2c, &h2c->dbuf);
Olivier Houchard46677732018-11-29 17:06:17 +01002822 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02002823 }
2824
Willy Tarreaub7b5fe12018-06-18 13:33:09 +02002825 if (b_data(buf) == buf->size)
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002826 h2c->flags |= H2_CF_DEM_DFULL;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002827 return 1;
Willy Tarreau62f52692017-10-08 23:01:42 +02002828}
2829
Willy Tarreau479998a2018-11-18 06:30:59 +01002830/* Try to send data if possible.
2831 * The function returns 1 if data have been sent, otherwise zero.
2832 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002833static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002834{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002835 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02002836 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002837 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002838
2839 if (conn->flags & CO_FL_ERROR)
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01002840 return 1;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002841
Olivier Houchard7505f942018-08-21 18:10:44 +02002842
Willy Tarreaua2af5122017-10-09 11:56:46 +02002843 if (conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN)) {
2844 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002845 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002846 }
2847
Willy Tarreaubc933932017-10-09 16:21:43 +02002848 /* This loop is quite simple : it tries to fill as much as it can from
2849 * pending streams into the existing buffer until it's reportedly full
2850 * or the end of send requests is reached. Then it tries to send this
2851 * buffer's contents out, marks it not full if at least one byte could
2852 * be sent, and tries again.
2853 *
2854 * The snd_buf() function normally takes a "flags" argument which may
2855 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
2856 * data immediately comes and CO_SFL_STREAMER to indicate that the
2857 * connection is streaming lots of data (used to increase TLS record
2858 * size at the expense of latency). The former can be sent any time
2859 * there's a buffer full flag, as it indicates at least one stream
2860 * attempted to send and failed so there are pending data. An
2861 * alternative would be to set it as long as there's an active stream
2862 * but that would be problematic for ACKs until we have an absolute
2863 * guarantee that all waiters have at least one byte to send. The
2864 * latter should possibly not be set for now.
2865 */
2866
2867 done = 0;
2868 while (!done) {
2869 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002870 unsigned int released = 0;
2871 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02002872
2873 /* fill as much as we can into the current buffer */
2874 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
2875 done = h2_process_mux(h2c);
2876
Olivier Houchard2b094432019-01-29 18:28:36 +01002877 if (h2c->flags & H2_CF_MUX_MALLOC)
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002878 done = 1; // we won't go further without extra buffers
Olivier Houchard2b094432019-01-29 18:28:36 +01002879
Willy Tarreaubc933932017-10-09 16:21:43 +02002880 if (conn->flags & CO_FL_ERROR)
2881 break;
2882
2883 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
2884 flags |= CO_SFL_MSG_MORE;
2885
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002886 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
2887 if (b_data(buf)) {
2888 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002889 if (!ret) {
2890 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002891 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002892 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002893 sent = 1;
2894 b_del(buf, ret);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002895 if (b_data(buf)) {
2896 done = 1;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002897 break;
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002898 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002899 }
2900 b_free(buf);
2901 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02002902 }
Willy Tarreaubc933932017-10-09 16:21:43 +02002903
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002904 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02002905 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002906
Willy Tarreaubc933932017-10-09 16:21:43 +02002907 /* wrote at least one byte, the buffer is not full anymore */
2908 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
2909 }
2910
Willy Tarreaua2af5122017-10-09 11:56:46 +02002911 if (conn->flags & CO_FL_SOCK_WR_SH) {
2912 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02002913 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02002914 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02002915 /* We're not full anymore, so we can wake any task that are waiting
2916 * for us.
2917 */
2918 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM))) {
Olivier Houchardd360ac62019-03-22 17:37:16 +01002919 struct h2s *h2s;
2920
2921 list_for_each_entry(h2s, &h2c->send_list, list) {
2922 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
2923 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002924
Willy Tarreauc234ae32019-05-13 17:56:11 +02002925 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002926 continue;
2927
Olivier Houchard998410a2019-04-15 19:23:37 +02002928 /* For some reason, the upper layer failed to subsribe again,
2929 * so remove it from the send_list
2930 */
2931 if (!h2s->send_wait) {
2932 LIST_DEL_INIT(&h2s->list);
2933 continue;
2934 }
Olivier Houchardd360ac62019-03-22 17:37:16 +01002935 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002936 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02002937 tasklet_wakeup(h2s->send_wait->tasklet);
Olivier Houchardd360ac62019-03-22 17:37:16 +01002938 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02002939 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02002940 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002941 /* We're done, no more to send */
Willy Tarreau662fafc2019-05-26 09:43:07 +02002942 if (!br_data(h2c->mbuf))
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002943 return sent;
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002944schedule:
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002945 if (!(conn->flags & CO_FL_ERROR) && !(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002946 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Willy Tarreau7f1265a2019-05-29 17:36:37 +02002947
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002948 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002949}
2950
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02002951/* this is the tasklet referenced in h2c->wait_event.tasklet */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002952static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
2953{
2954 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02002955 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002956
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002957 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02002958 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002959 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02002960 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01002961 if (ret || b_data(&h2c->dbuf))
Olivier Houchard7505f942018-08-21 18:10:44 +02002962 h2_process(h2c);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002963 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002964}
Willy Tarreaua2af5122017-10-09 11:56:46 +02002965
Willy Tarreau62f52692017-10-08 23:01:42 +02002966/* callback called on any event by the connection handler.
2967 * It applies changes and returns zero, or < 0 if it wants immediate
2968 * destruction of the connection (which normally doesn not happen in h2).
2969 */
Olivier Houchard7505f942018-08-21 18:10:44 +02002970static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002971{
Olivier Houchard7505f942018-08-21 18:10:44 +02002972 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002973
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002974 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01002975 h2_process_demux(h2c);
2976
2977 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002978 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01002979
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002980 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01002981 h2c->flags &= ~H2_CF_DEM_DFULL;
2982 }
Olivier Houchard7505f942018-08-21 18:10:44 +02002983 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01002984
Willy Tarreau0b37d652018-10-03 10:33:02 +02002985 if (unlikely(h2c->proxy->state == PR_STSTOPPED)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01002986 /* frontend is stopping, reload likely in progress, let's try
2987 * to announce a graceful shutdown if not yet done. We don't
2988 * care if it fails, it will be tried again later.
2989 */
2990 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
2991 if (h2c->last_sid < 0)
2992 h2c->last_sid = (1U << 31) - 1;
2993 h2c_send_goaway_error(h2c, NULL);
2994 }
2995 }
2996
Olivier Houchard7fc96d52017-11-23 18:25:47 +01002997 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01002998 * If we received early data, and the handshake is done, wake
2999 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003000 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003001 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
3002 (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_HANDSHAKE | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
3003 struct eb32_node *node;
3004 struct h2s *h2s;
3005
3006 h2c->flags |= H2_CF_WAIT_FOR_HS;
3007 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
3008
3009 while (node) {
3010 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01003011 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01003012 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003013 node = eb32_next(node);
3014 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01003015 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01003016
Willy Tarreau26bd7612017-10-09 16:47:04 +02003017 if (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01003018 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
3019 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
3020 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02003021 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003022
3023 if (eb_is_empty(&h2c->streams_by_id)) {
3024 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003025 h2_release(h2c);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003026 return -1;
3027 }
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003028 }
3029
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003030 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01003031 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02003032
Olivier Houchard53216e72018-10-10 15:46:36 +02003033 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
3034 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
3035 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02003036 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02003037 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
3038 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02003039 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02003040
Willy Tarreau3f133572017-10-31 19:21:06 +01003041 if (h2c->task) {
Willy Tarreau73481192019-06-07 08:20:46 +02003042 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3043 task_queue(h2c->task);
Willy Tarreauea392822017-10-31 10:02:25 +01003044 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02003045
Olivier Houchard7505f942018-08-21 18:10:44 +02003046 h2_send(h2c);
Willy Tarreau62f52692017-10-08 23:01:42 +02003047 return 0;
3048}
3049
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003050/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003051static int h2_wake(struct connection *conn)
3052{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003053 struct h2c *h2c = conn->ctx;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003054
3055 return (h2_process(h2c));
3056}
3057
Willy Tarreauea392822017-10-31 10:02:25 +01003058/* Connection timeout management. The principle is that if there's no receipt
3059 * nor sending for a certain amount of time, the connection is closed. If the
3060 * MUX buffer still has lying data or is not allocatable, the connection is
3061 * immediately killed. If it's allocatable and empty, we attempt to send a
3062 * GOAWAY frame.
3063 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003064static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003065{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003066 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003067 int expired = tick_is_expired(t->expire, now_ms);
3068
Willy Tarreau0975f112018-03-29 15:22:59 +02003069 if (!expired && h2c)
Willy Tarreauea392822017-10-31 10:02:25 +01003070 return t;
3071
Olivier Houchard3f795f72019-04-17 22:51:06 +02003072 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003073
3074 if (!h2c) {
3075 /* resources were already deleted */
3076 return NULL;
3077 }
3078
3079 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003080 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003081 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003082
Willy Tarreau662fafc2019-05-26 09:43:07 +02003083 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003084 /* don't even try to send a GOAWAY, the buffer is stuck */
3085 h2c->flags |= H2_CF_GOAWAY_FAILED;
3086 }
3087
3088 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003089 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003090 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3091 h2c->flags |= H2_CF_GOAWAY_FAILED;
3092
Willy Tarreau662fafc2019-05-26 09:43:07 +02003093 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003094 unsigned int released = 0;
3095 struct buffer *buf;
3096
3097 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3098 if (b_data(buf)) {
3099 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3100 if (!ret)
3101 break;
3102 b_del(buf, ret);
3103 if (b_data(buf))
3104 break;
3105 b_free(buf);
3106 released++;
3107 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003108 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003109
3110 if (released)
Willy Tarreau201840a2019-05-29 17:50:48 +02003111 offer_buffers(NULL, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003112 }
Willy Tarreauea392822017-10-31 10:02:25 +01003113
Willy Tarreau0975f112018-03-29 15:22:59 +02003114 /* either we can release everything now or it will be done later once
3115 * the last stream closes.
3116 */
3117 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003118 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003119
Willy Tarreauea392822017-10-31 10:02:25 +01003120 return NULL;
3121}
3122
3123
Willy Tarreau62f52692017-10-08 23:01:42 +02003124/*******************************************/
3125/* functions below are used by the streams */
3126/*******************************************/
3127
3128/*
3129 * Attach a new stream to a connection
3130 * (Used for outgoing connections)
3131 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003132static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003133{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003134 struct conn_stream *cs;
3135 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003136 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003137
3138 cs = cs_new(conn);
3139 if (!cs)
3140 return NULL;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003141 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003142 if (!h2s) {
3143 cs_free(cs);
3144 return NULL;
3145 }
3146 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003147}
3148
Willy Tarreaufafd3982018-11-18 21:29:20 +01003149/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3150 * We have to scan because we may have some orphan streams. It might be
3151 * beneficial to scan backwards from the end to reduce the likeliness to find
3152 * orphans.
3153 */
3154static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3155{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003156 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003157 struct h2s *h2s;
3158 struct eb32_node *node;
3159
3160 node = eb32_first(&h2c->streams_by_id);
3161 while (node) {
3162 h2s = container_of(node, struct h2s, by_id);
3163 if (h2s->cs)
3164 return h2s->cs;
3165 node = eb32_next(node);
3166 }
3167 return NULL;
3168}
3169
Willy Tarreau62f52692017-10-08 23:01:42 +02003170/*
Olivier Houchard060ed432018-11-06 16:32:42 +01003171 * Destroy the mux and the associated connection, if it is no longer used
3172 */
Christopher Faulet73c12072019-04-08 11:23:22 +02003173static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01003174{
Christopher Faulet73c12072019-04-08 11:23:22 +02003175 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01003176
Christopher Faulet39a96ee2019-04-08 10:52:21 +02003177 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02003178 h2_release(h2c);
Olivier Houchard060ed432018-11-06 16:32:42 +01003179}
3180
3181/*
Willy Tarreau62f52692017-10-08 23:01:42 +02003182 * Detach the stream from the connection and possibly release the connection.
3183 */
3184static void h2_detach(struct conn_stream *cs)
3185{
Willy Tarreau60935142017-10-16 18:11:19 +02003186 struct h2s *h2s = cs->ctx;
3187 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003188 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003189
3190 cs->ctx = NULL;
3191 if (!h2s)
3192 return;
3193
Olivier Houchard998410a2019-04-15 19:23:37 +02003194 /* The stream is about to die, so no need to attempt to run its task */
Willy Tarreauc234ae32019-05-13 17:56:11 +02003195 if (LIST_ADDED(&h2s->sending_list) &&
Olivier Houchard998410a2019-04-15 19:23:37 +02003196 h2s->send_wait != &h2s->wait_event) {
Willy Tarreau86eded62019-06-14 14:47:49 +02003197 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchard998410a2019-04-15 19:23:37 +02003198 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd9986ed2019-05-09 13:24:08 +02003199 /*
3200 * At this point, the stream_interface is supposed to have called
3201 * h2_unsubscribe(), so the only way there's still a
3202 * subscription that came from the stream_interface (as we
3203 * can subscribe ourself, in h2_do_shutw() and h2_do_shutr(),
3204 * without the stream_interface involved) is that we subscribed
3205 * for sending, we woke the tasklet up and removed the
3206 * SUB_RETRY_SEND flag, so the stream_interface would not
3207 * know it has to unsubscribe for send, but the tasklet hasn't
3208 * run yet. Make sure to handle that by explicitely setting
3209 * send_wait to NULL, as nothing else will do it for us.
3210 */
3211 h2s->send_wait = NULL;
Olivier Houchard998410a2019-04-15 19:23:37 +02003212 }
3213
Olivier Houchardf502aca2018-12-14 19:42:40 +01003214 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003215 h2c = h2s->h2c;
3216 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02003217 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01003218 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
3219 !h2_frt_has_too_many_cs(h2c)) {
3220 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02003221 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003222 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02003223 }
Willy Tarreau60935142017-10-16 18:11:19 +02003224
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003225 /* this stream may be blocked waiting for some data to leave (possibly
3226 * an ES or RST frame), so orphan it in this case.
3227 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02003228 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02003229 (h2c->st0 < H2_CS_ERROR) &&
Olivier Houchard16ff2612019-03-21 15:48:46 +01003230 (h2s->flags & (H2_SF_BLK_MBUSY | H2_SF_BLK_MROOM | H2_SF_BLK_MFCTL)) && (h2s->send_wait || h2s->recv_wait))
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003231 return;
3232
Willy Tarreau45f752e2017-10-30 15:44:59 +01003233 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
3234 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
3235 /* unblock the connection if it was blocked on this
3236 * stream.
3237 */
3238 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
3239 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003240 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01003241 }
3242
Willy Tarreau71049cc2018-03-28 13:56:39 +02003243 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02003244
Olivier Houchard8a786902018-12-15 16:05:40 +01003245 if (h2c->flags & H2_CF_IS_BACK &&
3246 (h2c->proxy->options2 & PR_O2_USE_HTX)) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003247 if (!(h2c->conn->flags &
3248 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
3249 if (!h2c->conn->owner) {
Olivier Houchardf502aca2018-12-14 19:42:40 +01003250 h2c->conn->owner = sess;
Olivier Houchard351411f2018-12-27 17:20:54 +01003251 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
3252 h2c->conn->owner = NULL;
3253 if (eb_is_empty(&h2c->streams_by_id)) {
3254 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn))
3255 /* The server doesn't want it, let's kill the connection right away */
3256 h2c->conn->mux->destroy(h2c->conn);
3257 return;
3258 }
3259 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003260 }
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003261 if (eb_is_empty(&h2c->streams_by_id)) {
3262 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0)
3263 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
3264 return;
3265 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003266 /* Never ever allow to reuse a connection from a non-reuse backend */
3267 if ((h2c->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
3268 h2c->conn->flags |= CO_FL_PRIVATE;
Willy Tarreauc234ae32019-05-13 17:56:11 +02003269 if (!LIST_ADDED(&h2c->conn->list) && h2c->nb_streams < h2c->streams_limit) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003270 struct server *srv = objt_server(h2c->conn->target);
3271
3272 if (srv) {
3273 if (h2c->conn->flags & CO_FL_PRIVATE)
3274 LIST_ADD(&srv->priv_conns[tid], &h2c->conn->list);
3275 else
3276 LIST_ADD(&srv->idle_conns[tid], &h2c->conn->list);
3277 }
3278
3279 }
3280 }
3281 }
3282
Willy Tarreaue323f342018-03-28 13:51:45 +02003283 /* We don't want to close right now unless we're removing the
3284 * last stream, and either the connection is in error, or it
3285 * reached the ID already specified in a GOAWAY frame received
3286 * or sent (as seen by last_sid >= 0).
3287 */
Olivier Houchard7a977432019-03-21 15:47:13 +01003288 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02003289 /* no more stream will come, kill it now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003290 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02003291 }
3292 else if (h2c->task) {
Willy Tarreau73481192019-06-07 08:20:46 +02003293 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3294 task_queue(h2c->task);
Willy Tarreau60935142017-10-16 18:11:19 +02003295 }
Willy Tarreau62f52692017-10-08 23:01:42 +02003296}
3297
Willy Tarreau88bdba32019-05-13 18:17:53 +02003298/* Performs a synchronous or asynchronous shutr(). */
3299static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003300{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003301 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003302 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003303
Willy Tarreauf983d002019-05-14 10:40:21 +02003304 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003305 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003306
Willy Tarreau18059042019-01-31 19:12:48 +01003307 /* a connstream may require us to immediately kill the whole connection
3308 * for example because of a "tcp-request content reject" rule that is
3309 * normally used to limit abuse. In this case we schedule a goaway to
3310 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01003311 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003312 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003313 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3314 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3315 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3316 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003317 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
3318 /* Nothing was never sent for this stream, so reset with
3319 * REFUSED_STREAM error to let the client retry the
3320 * request.
3321 */
3322 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3323 }
Willy Tarreauebdb6a02019-08-06 10:30:58 +02003324 else {
3325 /* a final response was already provided, we don't want this
3326 * stream anymore. This may happen when the server responds
3327 * before the end of an upload and closes quickly (redirect,
3328 * deny, ...)
3329 */
3330 h2s_error(h2s, H2_ERR_CANCEL);
3331 }
Willy Tarreau18059042019-01-31 19:12:48 +01003332
Willy Tarreau90c32322017-11-24 08:00:30 +01003333 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003334 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003335 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003336
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003337 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003338 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau00dd0782018-03-01 16:31:34 +01003339 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003340 done:
3341 h2s->flags &= ~H2_SF_WANT_SHUTR;
3342 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003343add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02003344 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003345 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003346 if (h2s->flags & H2_SF_BLK_MFCTL) {
3347 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
3348 h2s->send_wait = sw;
3349 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
3350 h2s->send_wait = sw;
3351 LIST_ADDQ(&h2c->send_list, &h2s->list);
3352 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003353 }
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003354 /* Let the handler know we want shutr */
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003355 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003356 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02003357}
3358
Willy Tarreau88bdba32019-05-13 18:17:53 +02003359/* Performs a synchronous or asynchronous shutw(). */
3360static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003361{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003362 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003363 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003364
Willy Tarreauebdb6a02019-08-06 10:30:58 +02003365 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003366 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003367
Willy Tarreauebdb6a02019-08-06 10:30:58 +02003368 if (h2s->st != H2_SS_ERROR && (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01003369 /* we can cleanly close using an empty data frame only after headers */
3370
3371 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
3372 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003373 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01003374
3375 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01003376 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01003377 else
3378 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003379 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01003380 /* a connstream may require us to immediately kill the whole connection
3381 * for example because of a "tcp-request content reject" rule that is
3382 * normally used to limit abuse. In this case we schedule a goaway to
3383 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01003384 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003385 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003386 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3387 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3388 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3389 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003390 else {
3391 /* Nothing was never sent for this stream, so reset with
3392 * REFUSED_STREAM error to let the client retry the
3393 * request.
3394 */
3395 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3396 }
Willy Tarreau18059042019-01-31 19:12:48 +01003397
Willy Tarreau90c32322017-11-24 08:00:30 +01003398 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003399 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003400 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003401
Willy Tarreau00dd0782018-03-01 16:31:34 +01003402 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003403 }
3404
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003405 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003406 tasklet_wakeup(h2c->wait_event.tasklet);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003407 done:
3408 h2s->flags &= ~H2_SF_WANT_SHUTW;
3409 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003410
3411 add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02003412 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003413 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003414 if (h2s->flags & H2_SF_BLK_MFCTL) {
3415 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
3416 h2s->send_wait = sw;
3417 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
3418 h2s->send_wait = sw;
3419 LIST_ADDQ(&h2c->send_list, &h2s->list);
3420 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003421 }
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003422 /* let the handler know we want to shutw */
3423 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003424 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003425}
3426
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02003427/* This is the tasklet referenced in h2s->wait_event.tasklet, it is used for
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003428 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
3429 * and prevented the last frame from being emitted.
3430 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003431static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
3432{
3433 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003434 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003435
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003436 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003437 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003438 h2_do_shutw(h2s);
3439
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003440 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003441 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003442
Willy Tarreau88bdba32019-05-13 18:17:53 +02003443 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003444 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003445 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01003446
Willy Tarreau88bdba32019-05-13 18:17:53 +02003447 if (!h2s->cs) {
3448 h2s_destroy(h2s);
3449 if (h2c_is_dead(h2c))
3450 h2_release(h2c);
3451 }
Olivier Houchard7a977432019-03-21 15:47:13 +01003452 }
3453
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003454 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02003455}
3456
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003457/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003458static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
3459{
3460 struct h2s *h2s = cs->ctx;
3461
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003462 if (cs->flags & CS_FL_KILL_CONN)
3463 h2s->flags |= H2_SF_KILL_CONN;
3464
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003465 if (!mode)
3466 return;
3467
3468 h2_do_shutr(h2s);
3469}
3470
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003471/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003472static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
3473{
3474 struct h2s *h2s = cs->ctx;
3475
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003476 if (cs->flags & CS_FL_KILL_CONN)
3477 h2s->flags |= H2_SF_KILL_CONN;
3478
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003479 h2_do_shutw(h2s);
3480}
3481
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003482/* Decode the payload of a HEADERS frame and produce the equivalent HTTP/1 or
Willy Tarreau86277d42019-01-02 15:36:11 +01003483 * HTX request or response depending on the connection's side. Returns a
3484 * positive value on success, a negative value on failure, or 0 if it couldn't
3485 * proceed. May report connection errors in h2c->errcode if the frame is
3486 * non-decodable and the connection unrecoverable. In absence of connection
3487 * error when a failure is reported, the caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01003488 *
3489 * The function may fold CONTINUATION frames into the initial HEADERS frame
3490 * by removing padding and next frame header, then moving the CONTINUATION
3491 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
3492 * leaving a hole between the main frame and the beginning of the next one.
3493 * The possibly remaining incomplete or next frame at the end may be moved
3494 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
3495 * HEADERS frames are unwrapped into a temporary buffer before decoding.
3496 *
3497 * A buffer at the beginning of processing may look like this :
3498 *
3499 * ,---.---------.-----.--------------.--------------.------.---.
3500 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
3501 * `---^---------^-----^--------------^--------------^------^---'
3502 * | | <-----> | |
3503 * area | dpl | wrap
3504 * |<--------------> |
3505 * | dfl |
3506 * |<-------------------------------------------------->|
3507 * head data
3508 *
3509 * Padding is automatically overwritten when folding, participating to the
3510 * hole size after dfl :
3511 *
3512 * ,---.------------------------.-----.--------------.------.---.
3513 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
3514 * `---^------------------------^-----^--------------^------^---'
3515 * | | <-----> | |
3516 * area | hole | wrap
3517 * |<-----------------------> |
3518 * | dfl |
3519 * |<-------------------------------------------------->|
3520 * head data
3521 *
3522 * Please note that the HEADERS frame is always deprived from its PADLEN byte
3523 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
3524 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01003525 *
3526 * The <flags> field must point to either the stream's flags or to a copy of it
3527 * so that the function can update the following flags :
3528 * - H2_SF_DATA_CLEN when content-length is seen
3529 * - H2_SF_DATA_CHNK when chunking should be used for the H1 conversion
3530 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01003531 *
3532 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
3533 * decoding, in order to detect if we're dealing with a headers or a trailers
3534 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02003535 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003536static 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 +02003537{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003538 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02003539 struct buffer *tmp = get_trash_chunk();
Christopher Faulete4ab11b2019-06-11 15:05:37 +02003540 struct http_hdr list[global.tune.max_http_hdr * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02003541 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02003542 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003543 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01003544 int flen; // header frame len
3545 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01003546 int ret = 0;
3547 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02003548 int wrap;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003549 int try = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02003550
Willy Tarreauea18f862018-12-22 20:19:26 +01003551next_frame:
3552 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
3553 goto leave; // incomplete input frame
3554
3555 /* No END_HEADERS means there's one or more CONTINUATION frames. In
3556 * this case, we'll try to paste it immediately after the initial
3557 * HEADERS frame payload and kill any possible padding. The initial
3558 * frame's length will be increased to represent the concatenation
3559 * of the two frames. The next frame is read from position <tlen>
3560 * and written at position <flen> (minus padding if some is present).
3561 */
3562 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
3563 struct h2_fh hdr;
3564 int clen; // CONTINUATION frame's payload length
3565
3566 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
3567 /* no more data, the buffer may be full, either due to
3568 * too large a frame or because of too large a hole that
3569 * we're going to compact at the end.
3570 */
3571 goto leave;
3572 }
3573
3574 if (hdr.ft != H2_FT_CONTINUATION) {
3575 /* RFC7540#6.10: frame of unexpected type */
3576 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3577 goto fail;
3578 }
3579
3580 if (hdr.sid != h2c->dsi) {
3581 /* RFC7540#6.10: frame of different stream */
3582 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3583 goto fail;
3584 }
3585
3586 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
3587 /* RFC7540#4.2: invalid frame length */
3588 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3589 goto fail;
3590 }
3591
3592 /* detect when we must stop aggragating frames */
3593 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
3594
3595 /* Take as much as we can of the CONTINUATION frame's payload */
3596 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
3597 if (clen > hdr.len)
3598 clen = hdr.len;
3599
3600 /* Move the frame's payload over the padding, hole and frame
3601 * header. At least one of hole or dpl is null (see diagrams
3602 * above). The hole moves after the new aggragated frame.
3603 */
3604 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
3605 h2c->dfl += clen - h2c->dpl;
3606 hole += h2c->dpl + 9;
3607 h2c->dpl = 0;
3608 goto next_frame;
3609 }
3610
3611 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01003612
Willy Tarreau13278b42017-10-13 19:23:14 +02003613 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003614 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02003615 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02003616 copy = alloc_trash_chunk();
3617 if (!copy) {
3618 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
3619 goto fail;
3620 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02003621 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
3622 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
3623 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02003624 }
3625
Willy Tarreau13278b42017-10-13 19:23:14 +02003626 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
3627 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003628 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01003629 /* RFC7540#5.3.1 : stream dep may not depend on itself */
3630 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02003631 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01003632 }
3633
Willy Tarreaua01f45e2018-12-31 07:41:24 +01003634 if (flen < 5) {
3635 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3636 goto fail;
3637 }
3638
Willy Tarreau13278b42017-10-13 19:23:14 +02003639 hdrs += 5; // stream dep = 4, weight = 1
3640 flen -= 5;
3641 }
3642
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003643 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau937f7602018-02-26 15:22:17 +01003644 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01003645 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003646 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003647
Willy Tarreau937f7602018-02-26 15:22:17 +01003648 /* we can't retry a failed decompression operation so we must be very
3649 * careful not to take any risks. In practice the output buffer is
3650 * always empty except maybe for trailers, in which case we simply have
3651 * to wait for the upper layer to finish consuming what is available.
3652 */
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003653
3654 if (h2c->proxy->options2 & PR_O2_USE_HTX) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003655 htx = htx_from_buf(rxbuf);
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003656 if (!htx_is_empty(htx)) {
3657 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau86277d42019-01-02 15:36:11 +01003658 goto leave;
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003659 }
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003660 } else {
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003661 if (b_data(rxbuf)) {
3662 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau86277d42019-01-02 15:36:11 +01003663 goto leave;
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003664 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003665
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003666 rxbuf->head = 0;
3667 try = b_size(rxbuf);
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003668 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003669
Willy Tarreau25919232019-01-03 14:48:18 +01003670 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003671 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
3672 sizeof(list)/sizeof(list[0]), tmp);
3673 if (outlen < 0) {
3674 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
3675 goto fail;
3676 }
3677
Willy Tarreau25919232019-01-03 14:48:18 +01003678 /* The PACK decompressor was updated, let's update the input buffer and
3679 * the parser's state to commit these changes and allow us to later
3680 * fail solely on the stream if needed.
3681 */
3682 b_del(&h2c->dbuf, h2c->dfl + hole);
3683 h2c->dfl = hole = 0;
3684 h2c->st0 = H2_CS_FRAME_H;
3685
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003686 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01003687 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003688
Willy Tarreau88d138e2019-01-02 19:38:14 +01003689 if (*flags & H2_SF_HEADERS_RCVD)
3690 goto trailers;
3691
3692 /* This is the first HEADERS frame so it's a headers block */
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003693 if (htx) {
3694 /* HTX mode */
3695 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003696 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003697 else
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003698 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003699 } else {
3700 /* HTTP/1 mode */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003701 outlen = h2_make_h1_request(list, b_tail(rxbuf), try, &msgf, body_len);
Willy Tarreau83195932019-01-03 10:26:23 +01003702 if (outlen > 0)
3703 b_add(rxbuf, outlen);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003704 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003705
3706 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01003707 /* too large headers? this is a stream error only */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003708 goto fail;
3709 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003710
Willy Tarreau174b06a2018-04-25 18:13:58 +02003711 if (msgf & H2_MSGF_BODY) {
3712 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003713 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003714 *flags |= H2_SF_DATA_CLEN;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003715 if (htx)
3716 htx->extra = *body_len;
3717 }
Olivier Houchard50d660c2018-12-08 00:18:31 +01003718 else if (!(msgf & H2_MSGF_BODY_TUNNEL) && !htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003719 *flags |= H2_SF_DATA_CHNK;
Willy Tarreau174b06a2018-04-25 18:13:58 +02003720 }
3721
Willy Tarreau88d138e2019-01-02 19:38:14 +01003722 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01003723 /* indicate that a HEADERS frame was received for this stream, except
3724 * for 1xx responses. For 1xx responses, another HEADERS frame is
3725 * expected.
3726 */
3727 if (!(msgf & H2_MSGF_RSP_1XX))
3728 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01003729
Christopher Fauletb75b5ea2019-05-17 08:37:28 +02003730 if ((h2c->dff & H2_F_HEADERS_END_STREAM)) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01003731 /* Mark the end of message, either using EOM in HTX or with the
3732 * trailing CRLF after the end of trailers. Note that DATA_CHNK
Willy Tarreau2135f912019-05-07 11:17:32 +02003733 * is not set during headers with END_STREAM. For HTX trailers,
3734 * we must not leave an HTX trailers block not followed by an
3735 * EOM block, the two must be atomic. Thus if we fail to emit
3736 * the EOM block we must remove the TLR block we've just added.
Willy Tarreau88d138e2019-01-02 19:38:14 +01003737 */
3738 if (htx) {
Christopher Faulet2d7c5392019-06-03 10:41:26 +02003739 if (!htx_add_endof(htx, HTX_BLK_EOM))
Willy Tarreau88d138e2019-01-02 19:38:14 +01003740 goto fail;
3741 }
3742 else if (*flags & H2_SF_DATA_CHNK) {
3743 if (!b_putblk(rxbuf, "\r\n", 2))
3744 goto fail;
3745 }
3746 }
Willy Tarreau937f7602018-02-26 15:22:17 +01003747
Willy Tarreau86277d42019-01-02 15:36:11 +01003748 /* success */
3749 ret = 1;
3750
Willy Tarreau68dd9852017-07-03 14:44:26 +02003751 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01003752 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01003753 * move the remaining data over it.
3754 */
3755 if (hole) {
3756 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
3757 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
3758 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
3759 b_sub(&h2c->dbuf, hole);
3760 }
3761
Willy Tarreau97215ca2019-04-29 10:20:21 +02003762 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01003763 /* too large frames */
3764 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01003765 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01003766 }
3767
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01003768 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003769 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02003770 free_trash_chunk(copy);
Willy Tarreau86277d42019-01-02 15:36:11 +01003771 return ret;
3772
Willy Tarreau68dd9852017-07-03 14:44:26 +02003773 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01003774 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02003775 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003776
3777 trailers:
3778 /* This is the last HEADERS frame hence a trailer */
3779
3780 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
3781 /* It's a trailer but it's missing ES flag */
3782 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3783 goto fail;
3784 }
3785
Christopher Faulet54b5e212019-06-04 10:08:28 +02003786 /* Trailers terminate a DATA sequence. In HTX we always handle them. In
3787 * legacy, when using chunks, we have to emit the 0 CRLF marker first
3788 * and then handle the trailers. For other modes, the trailers are
3789 * silently dropped.
Willy Tarreau88d138e2019-01-02 19:38:14 +01003790 */
3791 if (htx) {
Willy Tarreau5255f282019-01-03 18:41:05 +01003792 if (h2_make_htx_trailers(list, htx) <= 0)
3793 goto fail;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003794 }
3795 else if (*flags & H2_SF_DATA_CHNK) {
3796 /* Legacy mode with chunked encoding : we must finalize the
3797 * data block message emit the trailing CRLF */
3798 if (!b_putblk(rxbuf, "0\r\n", 3))
3799 goto fail;
Willy Tarreaue2b05cc2019-01-03 16:18:34 +01003800
3801 outlen = h2_make_h1_trailers(list, b_tail(rxbuf), try);
3802 if (outlen > 0)
3803 b_add(rxbuf, outlen);
3804 else
3805 goto fail;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003806 }
3807
3808 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02003809}
3810
Willy Tarreau454f9052017-10-26 19:40:35 +02003811/* Transfer the payload of a DATA frame to the HTTP/1 side. When content-length
3812 * or a tunnel is used, the contents are copied as-is. When chunked encoding is
3813 * in use, a new chunk is emitted for each frame. This is supposed to fit
3814 * because the smallest chunk takes 1 byte for the size, 2 for CRLF, X for the
3815 * data, 2 for the extra CRLF, so that's 5+X, while on the H2 side the smallest
3816 * frame will be 9+X bytes based on the same buffer size. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003817 * parser state is automatically updated. Returns > 0 if it could completely
3818 * send the current frame, 0 if it couldn't complete, in which case
3819 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
3820 * DATA frame can return 0 as a valid result). Stream errors are reported in
3821 * h2s->errcode and connection errors in h2c->errcode. The caller must already
3822 * have checked the frame header and ensured that the frame was complete or the
3823 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02003824 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01003825static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02003826{
3827 struct h2c *h2c = h2s->h2c;
3828 int block1, block2;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003829 unsigned int flen = 0;
Willy Tarreaueba10f22018-04-25 20:44:22 +02003830 unsigned int chklen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003831 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003832 struct buffer *csbuf;
Willy Tarreau454f9052017-10-26 19:40:35 +02003833
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003834 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02003835
Olivier Houchard638b7992018-08-16 15:41:52 +02003836 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01003837 if (!csbuf) {
3838 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003839 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003840 }
3841
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003842try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003843 flen = h2c->dfl - h2c->dpl;
Olivier Houchard2f308832018-12-19 15:53:53 +01003844 if (h2c->proxy->options2 & PR_O2_USE_HTX)
3845 htx = htx_from_buf(csbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003846 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01003847 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003848
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003849 if (flen > b_data(&h2c->dbuf)) {
3850 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003851 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01003852 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003853 }
3854
Willy Tarreaua9b77962019-01-31 07:23:00 +01003855 if (htx) {
Willy Tarreau0a7ef022019-05-28 10:30:11 +02003856 unsigned int sent;
3857
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003858 block1 = htx_free_data_space(htx);
3859 if (!block1) {
3860 h2c->flags |= H2_CF_DEM_SFULL;
3861 goto fail;
3862 }
3863 if (flen > block1)
3864 flen = block1;
3865
3866 /* here, flen is the max we can copy into the output buffer */
3867 block1 = b_contig_data(&h2c->dbuf, 0);
3868 if (flen > block1)
3869 flen = block1;
3870
Willy Tarreau0a7ef022019-05-28 10:30:11 +02003871 sent = htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen));
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003872
Willy Tarreaub6563f42019-06-15 11:34:41 +02003873 b_del(&h2c->dbuf, sent);
3874 h2c->dfl -= sent;
3875 h2c->rcvd_c += sent;
3876 h2c->rcvd_s += sent; // warning, this can also affect the closed streams!
Willy Tarreau1915ca22019-01-24 11:49:37 +01003877
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003878 if (h2s->flags & H2_SF_DATA_CLEN) {
Willy Tarreaub6563f42019-06-15 11:34:41 +02003879 h2s->body_len -= sent;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003880 htx->extra = h2s->body_len;
3881 }
Willy Tarreau0a7ef022019-05-28 10:30:11 +02003882
3883 if (sent < flen) {
3884 h2c->flags |= H2_CF_DEM_SFULL;
3885 goto fail;
3886 }
3887
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003888 goto try_again;
3889 }
Willy Tarreau455d5682019-05-24 19:42:18 +02003890 else if (unlikely(b_space_wraps(csbuf) &&
3891 flen + chklen <= b_room(csbuf) &&
3892 b_data(csbuf) <= MAX_DATA_REALIGN)) {
3893 /* it doesn't fit in a single block and the buffer is fragmented, if there are
3894 * not too many data in the buffer, let's defragment it and try
3895 * again.
Willy Tarreaud755ea62018-02-26 15:44:54 +01003896 */
3897 b_slow_realign(csbuf, trash.area, 0);
Willy Tarreau454f9052017-10-26 19:40:35 +02003898 }
3899
Willy Tarreaueba10f22018-04-25 20:44:22 +02003900 /* chunked-encoding requires more room */
3901 if (h2s->flags & H2_SF_DATA_CHNK) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01003902 chklen = MIN(flen, b_room(csbuf));
Willy Tarreaueba10f22018-04-25 20:44:22 +02003903 chklen = (chklen < 16) ? 1 : (chklen < 256) ? 2 :
3904 (chklen < 4096) ? 3 : (chklen < 65536) ? 4 :
3905 (chklen < 1048576) ? 4 : 8;
3906 chklen += 4; // CRLF, CRLF
3907 }
3908
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003909 /* does it fit in output buffer or should we wait ? */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003910 if (flen + chklen > b_room(csbuf)) {
3911 if (chklen >= b_room(csbuf)) {
3912 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003913 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003914 }
3915 flen = b_room(csbuf) - chklen;
Willy Tarreaueba10f22018-04-25 20:44:22 +02003916 }
3917
3918 if (h2s->flags & H2_SF_DATA_CHNK) {
3919 /* emit the chunk size */
3920 unsigned int chksz = flen;
3921 char str[10];
3922 char *beg;
3923
3924 beg = str + sizeof(str);
3925 *--beg = '\n';
3926 *--beg = '\r';
3927 do {
3928 *--beg = hextab[chksz & 0xF];
3929 } while (chksz >>= 4);
Willy Tarreaud755ea62018-02-26 15:44:54 +01003930 b_putblk(csbuf, beg, str + sizeof(str) - beg);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003931 }
3932
Willy Tarreau454f9052017-10-26 19:40:35 +02003933 /* Block1 is the length of the first block before the buffer wraps,
3934 * block2 is the optional second block to reach the end of the frame.
3935 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003936 block1 = b_contig_data(&h2c->dbuf, 0);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003937 if (block1 > flen)
3938 block1 = flen;
Willy Tarreau454f9052017-10-26 19:40:35 +02003939 block2 = flen - block1;
3940
3941 if (block1)
Willy Tarreaud755ea62018-02-26 15:44:54 +01003942 b_putblk(csbuf, b_head(&h2c->dbuf), block1);
Willy Tarreau454f9052017-10-26 19:40:35 +02003943
3944 if (block2)
Willy Tarreaud755ea62018-02-26 15:44:54 +01003945 b_putblk(csbuf, b_peek(&h2c->dbuf, block1), block2);
Willy Tarreau454f9052017-10-26 19:40:35 +02003946
Willy Tarreaueba10f22018-04-25 20:44:22 +02003947 if (h2s->flags & H2_SF_DATA_CHNK) {
3948 /* emit the CRLF */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003949 b_putblk(csbuf, "\r\n", 2);
Willy Tarreaueba10f22018-04-25 20:44:22 +02003950 }
3951
Willy Tarreau454f9052017-10-26 19:40:35 +02003952 /* now mark the input data as consumed (will be deleted from the buffer
3953 * by the caller when seeing FRAME_A after sending the window update).
3954 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003955 b_del(&h2c->dbuf, flen);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003956 h2c->dfl -= flen;
3957 h2c->rcvd_c += flen;
3958 h2c->rcvd_s += flen; // warning, this can also affect the closed streams!
3959
Willy Tarreau1915ca22019-01-24 11:49:37 +01003960 if (h2s->flags & H2_SF_DATA_CLEN)
3961 h2s->body_len -= flen;
3962
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003963 if (h2c->dfl > h2c->dpl) {
3964 /* more data available, transfer stalled on stream full */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003965 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003966 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003967 }
3968
Willy Tarreau4a28da12018-01-04 14:41:00 +01003969 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003970 /* here we're done with the frame, all the payload (except padding) was
3971 * transferred.
3972 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02003973
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003974 if (h2c->dff & H2_F_DATA_END_STREAM) {
3975 if (htx) {
3976 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
3977 h2c->flags |= H2_CF_DEM_SFULL;
3978 goto fail;
3979 }
Willy Tarreaud755ea62018-02-26 15:44:54 +01003980 }
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003981 else if (h2s->flags & H2_SF_DATA_CHNK) {
3982 /* emit the trailing 0 CRLF CRLF */
3983 if (b_room(csbuf) < 5) {
3984 h2c->flags |= H2_CF_DEM_SFULL;
3985 goto fail;
3986 }
3987 chklen += 5;
3988 b_putblk(csbuf, "0\r\n\r\n", 5);
3989 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02003990 }
3991
Willy Tarreaud1023bb2018-03-22 16:53:12 +01003992 h2c->rcvd_c += h2c->dpl;
3993 h2c->rcvd_s += h2c->dpl;
3994 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02003995 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01003996 if (htx)
3997 htx_to_buf(htx, csbuf);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003998 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003999 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01004000 if (htx)
4001 htx_to_buf(htx, csbuf);
Willy Tarreau454b57b2018-02-26 15:50:05 +01004002 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02004003}
4004
Willy Tarreau5dd17352018-06-14 13:33:30 +02004005/* Try to send a HEADERS frame matching HTTP/1 response present at offset <ofs>
4006 * and for <max> bytes in buffer <buf> for the H2 stream <h2s>. Returns the
4007 * number of bytes sent. The caller must check the stream's status to detect
4008 * any error which might have happened subsequently to a successful send.
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004009 */
Willy Tarreau206ba832018-06-14 15:27:31 +02004010static size_t h2s_frt_make_resp_headers(struct h2s *h2s, const struct buffer *buf, size_t ofs, size_t max)
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004011{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004012 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004013 struct h2c *h2c = h2s->h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +02004014 struct h1m *h1m = &h2s->h1m;
Willy Tarreau83061a82018-07-13 11:56:34 +02004015 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004016 struct buffer *mbuf;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02004017 union h1_sl sl;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004018 int es_now = 0;
4019 int ret = 0;
4020 int hdr;
4021
4022 if (h2c_mux_busy(h2c, h2s)) {
4023 h2s->flags |= H2_SF_BLK_MBUSY;
4024 return 0;
4025 }
4026
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004027 /* First, try to parse the H1 response and index it into <list>.
4028 * NOTE! Since it comes from haproxy, we *know* that a response header
4029 * block does not wrap and we can safely read it this way without
4030 * having to realign the buffer.
4031 */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004032 ret = h1_headers_to_hdr_list(b_peek(buf, ofs), b_peek(buf, ofs) + max,
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02004033 list, sizeof(list)/sizeof(list[0]), h1m, &sl);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004034 if (ret <= 0) {
Willy Tarreauf13ef962017-11-02 15:14:19 +01004035 /* incomplete or invalid response, this is abnormal coming from
4036 * haproxy and may only result in a bad errorfile or bad Lua code
4037 * so that won't be fixed, raise an error now.
4038 *
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004039 * FIXME: we should instead add the ability to only return a
4040 * 502 bad gateway. But in theory this is not supposed to
4041 * happen.
4042 */
4043 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4044 ret = 0;
4045 goto end;
4046 }
4047
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02004048 h2s->status = sl.st.status;
Willy Tarreaudb72da02018-09-13 11:52:20 +02004049
4050 /* certain statuses have no body or an empty one, regardless of
4051 * what the headers say.
4052 */
4053 if (sl.st.status >= 100 && sl.st.status < 200) {
4054 h1m->flags &= ~(H1_MF_CLEN | H1_MF_CHNK);
4055 h1m->curr_len = h1m->body_len = 0;
4056 }
4057 else if (sl.st.status == 204 || sl.st.status == 304) {
4058 /* no contents, claim c-len is present and set to zero */
4059 h1m->flags &= ~H1_MF_CHNK;
4060 h1m->flags |= H1_MF_CLEN;
4061 h1m->curr_len = h1m->body_len = 0;
4062 }
4063
Willy Tarreaubcc45952019-05-26 10:05:50 +02004064 mbuf = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02004065 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004066 if (!h2_get_buf(h2c, mbuf)) {
4067 h2c->flags |= H2_CF_MUX_MALLOC;
4068 h2s->flags |= H2_SF_BLK_MROOM;
4069 return 0;
4070 }
4071
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004072 chunk_reset(&outbuf);
4073
4074 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004075 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4076 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004077 break;
4078 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004079 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004080 }
4081
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004082 if (outbuf.size < 9)
4083 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004084
4085 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004086 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4087 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4088 outbuf.data = 9;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004089
4090 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004091 if (unlikely(list[0].v.len != 3)) {
Willy Tarreaua87f2022017-11-09 11:23:00 +01004092 /* this is an unparsable response */
4093 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4094 ret = 0;
4095 goto end;
4096 }
Willy Tarreauaafdf582018-12-10 18:06:40 +01004097
4098 if (!hpack_encode_str_status(&outbuf, h2s->status, list[0].v)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004099 if (b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004100 goto realign_again;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004101 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004102 }
4103
4104 /* encode all headers, stop at empty name */
4105 for (hdr = 1; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaua76e4c22017-11-24 08:17:28 +01004106 /* these ones do not exist in H2 and must be dropped. */
4107 if (isteq(list[hdr].n, ist("connection")) ||
4108 isteq(list[hdr].n, ist("proxy-connection")) ||
4109 isteq(list[hdr].n, ist("keep-alive")) ||
4110 isteq(list[hdr].n, ist("upgrade")) ||
4111 isteq(list[hdr].n, ist("transfer-encoding")))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004112 continue;
4113
4114 if (isteq(list[hdr].n, ist("")))
4115 break; // end
4116
4117 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4118 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004119 if (b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004120 goto realign_again;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004121 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004122 }
4123 }
4124
4125 /* we may need to add END_STREAM */
Willy Tarreau927b88b2019-03-04 08:03:25 +01004126 if (((h1m->flags & H1_MF_CLEN) && !h1m->body_len) || !h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004127 es_now = 1;
4128
4129 /* update the frame's size */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004130 h2_set_frame_size(outbuf.area, outbuf.data - 9);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004131
4132 if (es_now)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004133 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004134
4135 /* consume incoming H1 response */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004136 max -= ret;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004137
4138 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004139 b_add(mbuf, outbuf.data);
Willy Tarreau67434202017-11-06 20:20:51 +01004140 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004141
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004142 if (es_now) {
Willy Tarreau35a62702018-02-27 15:37:25 +01004143 // trim any possibly pending data (eg: inconsistent content-length)
Willy Tarreau5dd17352018-06-14 13:33:30 +02004144 ret += max;
Willy Tarreau35a62702018-02-27 15:37:25 +01004145
Willy Tarreau801250e2018-09-11 11:45:04 +02004146 h1m->state = H1_MSG_DONE;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004147 h2s->flags |= H2_SF_ES_SENT;
4148 if (h2s->st == H2_SS_OPEN)
4149 h2s->st = H2_SS_HLOC;
4150 else
Willy Tarreau00dd0782018-03-01 16:31:34 +01004151 h2s_close(h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004152 }
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02004153 else if (h2s->status >= 100 && h2s->status < 200) {
Willy Tarreau87285592017-11-29 15:41:32 +01004154 /* we'll let the caller check if it has more headers to send */
Willy Tarreau7f437ff2018-09-11 13:51:19 +02004155 h1m_init_res(h1m);
Willy Tarreau9b8cd1f2018-09-12 09:24:38 +02004156 h1m->err_pos = -1; // don't care about errors on the response path
Willy Tarreaueb528db2018-09-12 09:54:00 +02004157 h2s->h1m.flags |= H1_MF_TOLOWER;
Willy Tarreau87285592017-11-29 15:41:32 +01004158 goto end;
Willy Tarreauc199faf2017-10-31 08:35:27 +01004159 }
Willy Tarreau001823c2018-09-12 17:25:32 +02004160
4161 /* now the h1m state is either H1_MSG_CHUNK_SIZE or H1_MSG_DATA */
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004162
4163 end:
Dirkjan Bussinkc26c72d2018-09-14 14:30:25 +02004164 //fprintf(stderr, "[%d] sent simple H2 response (sid=%d) = %d bytes (%d in, ep=%u, es=%s)\n", h2c->st0, h2s->id, outbuf.len, ret, h1m->err_pos, h1m_state_str(h1m->err_state));
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004165 return ret;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004166 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004167 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4168 goto retry;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004169 h1m_init_res(h1m);
4170 h1m->err_pos = -1; // don't care about errors on the response path
4171 h2c->flags |= H2_CF_MUX_MFULL;
4172 h2s->flags |= H2_SF_BLK_MROOM;
4173 ret = 0;
4174 goto end;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004175}
4176
Willy Tarreau5dd17352018-06-14 13:33:30 +02004177/* Try to send a DATA frame matching HTTP/1 response present at offset <ofs>
4178 * for up to <max> bytes in response buffer <buf>, for stream <h2s>. Returns
4179 * the number of bytes sent. The caller must check the stream's status to
4180 * detect any error which might have happened subsequently to a successful send.
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004181 */
Willy Tarreau206ba832018-06-14 15:27:31 +02004182static size_t h2s_frt_make_resp_data(struct h2s *h2s, const struct buffer *buf, size_t ofs, size_t max)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004183{
4184 struct h2c *h2c = h2s->h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +02004185 struct h1m *h1m = &h2s->h1m;
Willy Tarreau83061a82018-07-13 11:56:34 +02004186 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004187 struct buffer *mbuf;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004188 int ret = 0;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02004189 size_t total = 0;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004190 int es_now = 0;
4191 int size = 0;
Willy Tarreau206ba832018-06-14 15:27:31 +02004192 const char *blk1, *blk2;
Willy Tarreau55f3ce12018-07-18 11:49:27 +02004193 size_t len1, len2;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004194
4195 if (h2c_mux_busy(h2c, h2s)) {
4196 h2s->flags |= H2_SF_BLK_MBUSY;
4197 goto end;
4198 }
4199
Willy Tarreaubcc45952019-05-26 10:05:50 +02004200 mbuf = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02004201 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004202 if (!h2_get_buf(h2c, mbuf)) {
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004203 h2c->flags |= H2_CF_MUX_MALLOC;
4204 h2s->flags |= H2_SF_BLK_MROOM;
4205 goto end;
4206 }
4207
4208 new_frame:
Willy Tarreau5dd17352018-06-14 13:33:30 +02004209 if (!max)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004210 goto end;
4211
4212 chunk_reset(&outbuf);
4213
4214 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004215 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4216 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004217 break;
4218 realign_again:
Willy Tarreau06ae84a2018-12-12 09:17:21 +01004219 /* If there are pending data in the output buffer, and we have
4220 * less than 1/4 of the mbuf's size and everything fits, we'll
4221 * still perform a copy anyway. Otherwise we'll pretend the mbuf
4222 * is full and wait, to save some slow realign calls.
4223 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004224 if ((max + 9 > b_room(mbuf) || max >= b_size(mbuf) / 4)) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004225 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4226 goto retry;
Willy Tarreau06ae84a2018-12-12 09:17:21 +01004227 h2c->flags |= H2_CF_MUX_MFULL;
4228 h2s->flags |= H2_SF_BLK_MROOM;
4229 goto end;
4230 }
4231
Willy Tarreaubcc45952019-05-26 10:05:50 +02004232 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004233 }
4234
4235 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004236 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4237 goto retry;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004238 h2c->flags |= H2_CF_MUX_MFULL;
4239 h2s->flags |= H2_SF_BLK_MROOM;
4240 goto end;
4241 }
4242
4243 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004244 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
4245 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4246 outbuf.data = 9;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004247
4248 switch (h1m->flags & (H1_MF_CLEN|H1_MF_CHNK)) {
4249 case 0: /* no content length, read till SHUTW */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004250 size = max;
Willy Tarreau13e4e942017-12-14 10:55:21 +01004251 h1m->curr_len = size;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004252 break;
4253 case H1_MF_CLEN: /* content-length: read only h2m->body_len */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004254 size = max;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004255 if ((long long)size > h1m->curr_len)
4256 size = h1m->curr_len;
4257 break;
4258 default: /* te:chunked : parse chunks */
Willy Tarreau801250e2018-09-11 11:45:04 +02004259 if (h1m->state == H1_MSG_CHUNK_CRLF) {
Willy Tarreauc0973c62018-06-14 15:53:21 +02004260 ret = h1_skip_chunk_crlf(buf, ofs, ofs + max);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004261 if (!ret)
4262 goto end;
4263
4264 if (ret < 0) {
4265 /* FIXME: bad contents. how to proceed here when we're in H2 ? */
Willy Tarreau25173a72018-09-12 09:05:16 +02004266 h1m->err_pos = ofs + max + ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004267 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4268 goto end;
4269 }
Willy Tarreau5dd17352018-06-14 13:33:30 +02004270 max -= ret;
4271 ofs += ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004272 total += ret;
Willy Tarreau801250e2018-09-11 11:45:04 +02004273 h1m->state = H1_MSG_CHUNK_SIZE;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004274 }
4275
Willy Tarreau801250e2018-09-11 11:45:04 +02004276 if (h1m->state == H1_MSG_CHUNK_SIZE) {
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004277 unsigned int chunk;
Willy Tarreau84d6b7a2018-06-14 15:59:05 +02004278 ret = h1_parse_chunk_size(buf, ofs, ofs + max, &chunk);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004279 if (!ret)
4280 goto end;
4281
4282 if (ret < 0) {
4283 /* FIXME: bad contents. how to proceed here when we're in H2 ? */
Willy Tarreau25173a72018-09-12 09:05:16 +02004284 h1m->err_pos = ofs + max + ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004285 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4286 goto end;
4287 }
4288
4289 size = chunk;
4290 h1m->curr_len = chunk;
4291 h1m->body_len += chunk;
Willy Tarreau5dd17352018-06-14 13:33:30 +02004292 max -= ret;
4293 ofs += ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004294 total += ret;
Willy Tarreau801250e2018-09-11 11:45:04 +02004295 h1m->state = size ? H1_MSG_DATA : H1_MSG_TRAILERS;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004296 if (!size)
4297 goto send_empty;
4298 }
4299
4300 /* in MSG_DATA state, continue below */
4301 size = h1m->curr_len;
4302 break;
4303 }
4304
4305 /* we have in <size> the exact number of bytes we need to copy from
4306 * the H1 buffer. We need to check this against the connection's and
4307 * the stream's send windows, and to ensure that this fits in the max
4308 * frame size and in the buffer's available space minus 9 bytes (for
4309 * the frame header). The connection's flow control is applied last so
4310 * that we can use a separate list of streams which are immediately
4311 * unblocked on window opening. Note: we don't implement padding.
4312 */
4313
Willy Tarreau5dd17352018-06-14 13:33:30 +02004314 if (size > max)
4315 size = max;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004316
Willy Tarreau5a9c8752019-08-02 07:52:08 +02004317 if (size > h2s_mws(h2s))
4318 size = h2s_mws(h2s);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004319
4320 if (size <= 0) {
4321 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004322 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02004323 LIST_DEL_INIT(&h2s->list);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004324 goto end;
4325 }
4326
4327 if (h2c->mfs && size > h2c->mfs)
4328 size = h2c->mfs;
4329
4330 if (size + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02004331 /* It doesn't fit at once. If it at least fits once split and
4332 * the amount of data to move is low, let's defragment the
4333 * buffer now.
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004334 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004335 if (b_space_wraps(mbuf) &&
4336 (size + 9 <= b_room(mbuf)) &&
4337 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004338 goto realign_again;
4339 size = outbuf.size - 9;
4340 }
4341
4342 if (size <= 0) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004343 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4344 goto retry;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004345 h2c->flags |= H2_CF_MUX_MFULL;
4346 h2s->flags |= H2_SF_BLK_MROOM;
4347 goto end;
4348 }
4349
4350 if (size > h2c->mws)
4351 size = h2c->mws;
4352
4353 if (size <= 0) {
4354 h2s->flags |= H2_SF_BLK_MFCTL;
4355 goto end;
4356 }
4357
4358 /* copy whatever we can */
4359 blk1 = blk2 = NULL; // silence a maybe-uninitialized warning
Willy Tarreau5dd17352018-06-14 13:33:30 +02004360 ret = b_getblk_nc(buf, &blk1, &len1, &blk2, &len2, ofs, max);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004361 if (ret == 1)
4362 len2 = 0;
4363
4364 if (!ret || len1 + len2 < size) {
4365 /* FIXME: must normally never happen */
4366 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4367 goto end;
4368 }
4369
4370 /* limit len1/len2 to size */
4371 if (len1 + len2 > size) {
4372 int sub = len1 + len2 - size;
4373
4374 if (len2 > sub)
4375 len2 -= sub;
4376 else {
4377 sub -= len2;
4378 len2 = 0;
4379 len1 -= sub;
4380 }
4381 }
4382
4383 /* now let's copy this this into the output buffer */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004384 memcpy(outbuf.area + 9, blk1, len1);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004385 if (len2)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004386 memcpy(outbuf.area + 9 + len1, blk2, len2);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004387
4388 send_empty:
4389 /* we may need to add END_STREAM */
4390 /* FIXME: we should also detect shutdown(w) below, but how ? Maybe we
4391 * could rely on the MSG_MORE flag as a hint for this ?
Willy Tarreau00610962018-07-19 10:58:28 +02004392 *
4393 * FIXME: what we do here is not correct because we send end_stream
4394 * before knowing if we'll have to send a HEADERS frame for the
4395 * trailers. More importantly we're not consuming the trailing CRLF
4396 * after the end of trailers, so it will be left to the caller to
4397 * eat it. The right way to do it would be to measure trailers here
4398 * and to send ES only if there are no trailers.
4399 *
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004400 */
4401 if (((h1m->flags & H1_MF_CLEN) && !(h1m->curr_len - size)) ||
Willy Tarreau801250e2018-09-11 11:45:04 +02004402 !h1m->curr_len || h1m->state >= H1_MSG_DONE)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004403 es_now = 1;
4404
4405 /* update the frame's size */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004406 h2_set_frame_size(outbuf.area, size);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004407
4408 if (es_now)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004409 outbuf.area[4] |= H2_F_DATA_END_STREAM;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004410
4411 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004412 b_add(mbuf, size + 9);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004413
4414 /* consume incoming H1 response */
4415 if (size > 0) {
Willy Tarreau5dd17352018-06-14 13:33:30 +02004416 max -= size;
4417 ofs += size;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004418 total += size;
4419 h1m->curr_len -= size;
Willy Tarreau5a9c8752019-08-02 07:52:08 +02004420 h2s->sws -= size;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004421 h2c->mws -= size;
4422
4423 if (size && !h1m->curr_len && (h1m->flags & H1_MF_CHNK)) {
Willy Tarreau801250e2018-09-11 11:45:04 +02004424 h1m->state = H1_MSG_CHUNK_CRLF;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004425 goto new_frame;
4426 }
4427 }
4428
4429 if (es_now) {
4430 if (h2s->st == H2_SS_OPEN)
4431 h2s->st = H2_SS_HLOC;
4432 else
Willy Tarreau00dd0782018-03-01 16:31:34 +01004433 h2s_close(h2s);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01004434
Willy Tarreau35a62702018-02-27 15:37:25 +01004435 if (!(h1m->flags & H1_MF_CHNK)) {
4436 // trim any possibly pending data (eg: inconsistent content-length)
Willy Tarreau5dd17352018-06-14 13:33:30 +02004437 total += max;
4438 ofs += max;
4439 max = 0;
Willy Tarreau35a62702018-02-27 15:37:25 +01004440
Willy Tarreau801250e2018-09-11 11:45:04 +02004441 h1m->state = H1_MSG_DONE;
Willy Tarreau35a62702018-02-27 15:37:25 +01004442 }
Willy Tarreau9d89ac82017-10-31 17:15:59 +01004443
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004444 h2s->flags |= H2_SF_ES_SENT;
4445 }
4446
4447 end:
Willy Tarreau5a9c8752019-08-02 07:52:08 +02004448 trace("[%d] sent simple H2 DATA response (sid=%d) = %d bytes out (%u in, st=%s, ep=%u, es=%s, h2cws=%d h2sws=%d) data=%u", h2c->st0, h2s->id, size+9, (unsigned int)total, h1m_state_str(h1m->state), h1m->err_pos, h1m_state_str(h1m->err_state), h2c->mws, h2s_mws(h2s), (unsigned int)b_data(buf));
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004449 return total;
4450}
4451
Willy Tarreau115e83b2018-12-01 19:17:53 +01004452/* Try to send a HEADERS frame matching HTX response present in HTX message
4453 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4454 * must check the stream's status to detect any error which might have happened
4455 * subsequently to a successful send. The htx blocks are automatically removed
4456 * from the message. The htx message is assumed to be valid since produced from
4457 * the internal code, hence it contains a start line, an optional series of
4458 * header blocks and an end of header, otherwise an invalid frame could be
4459 * emitted and the resulting htx message could be left in an inconsistent state.
4460 */
4461static size_t h2s_htx_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
4462{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004463 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau115e83b2018-12-01 19:17:53 +01004464 struct h2c *h2c = h2s->h2c;
4465 struct htx_blk *blk;
4466 struct htx_blk *blk_end;
4467 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004468 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004469 struct htx_sl *sl;
4470 enum htx_blk_type type;
4471 int es_now = 0;
4472 int ret = 0;
4473 int hdr;
4474 int idx;
4475
4476 if (h2c_mux_busy(h2c, h2s)) {
4477 h2s->flags |= H2_SF_BLK_MBUSY;
4478 return 0;
4479 }
4480
Willy Tarreau115e83b2018-12-01 19:17:53 +01004481 /* determine the first block which must not be deleted, blk_end may
4482 * be NULL if all blocks have to be deleted.
4483 */
4484 idx = htx_get_head(htx);
4485 blk_end = NULL;
4486 while (idx != -1) {
4487 type = htx_get_blk_type(htx_get_blk(htx, idx));
4488 idx = htx_get_next(htx, idx);
4489 if (type == HTX_BLK_EOH) {
4490 if (idx != -1)
4491 blk_end = htx_get_blk(htx, idx);
4492 break;
4493 }
4494 }
4495
4496 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004497 blk = htx_get_head_blk(htx);
4498 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_RES_SL);
4499 ALREADY_CHECKED(blk);
4500 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004501 h2s->status = sl->info.res.status;
Willy Tarreauaafdf582018-12-10 18:06:40 +01004502 if (h2s->status < 100 || h2s->status > 999)
4503 goto fail;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004504
4505 /* and the rest of the headers, that we dump starting at header 0 */
4506 hdr = 0;
4507
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004508 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004509 while ((idx = htx_get_next(htx, idx)) != -1) {
4510 blk = htx_get_blk(htx, idx);
4511 type = htx_get_blk_type(blk);
4512
4513 if (type == HTX_BLK_UNUSED)
4514 continue;
4515
4516 if (type != HTX_BLK_HDR)
4517 break;
4518
4519 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
4520 goto fail;
4521
4522 list[hdr].n = htx_get_blk_name(htx, blk);
4523 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004524 hdr++;
4525 }
4526
4527 /* marker for end of headers */
4528 list[hdr].n = ist("");
4529
4530 if (h2s->status == 204 || h2s->status == 304) {
4531 /* no contents, claim c-len is present and set to zero */
4532 es_now = 1;
4533 }
4534
Willy Tarreau9c218e72019-05-26 10:08:28 +02004535 mbuf = br_tail(h2c->mbuf);
4536 retry:
4537 if (!h2_get_buf(h2c, mbuf)) {
4538 h2c->flags |= H2_CF_MUX_MALLOC;
4539 h2s->flags |= H2_SF_BLK_MROOM;
4540 return 0;
4541 }
4542
Willy Tarreau115e83b2018-12-01 19:17:53 +01004543 chunk_reset(&outbuf);
4544
4545 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004546 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4547 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004548 break;
4549 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004550 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004551 }
4552
4553 if (outbuf.size < 9)
4554 goto full;
4555
4556 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4557 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4558 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4559 outbuf.data = 9;
4560
4561 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004562 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004563 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004564 goto realign_again;
4565 goto full;
4566 }
4567
4568 /* encode all headers, stop at empty name */
4569 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4570 /* these ones do not exist in H2 and must be dropped. */
4571 if (isteq(list[hdr].n, ist("connection")) ||
4572 isteq(list[hdr].n, ist("proxy-connection")) ||
4573 isteq(list[hdr].n, ist("keep-alive")) ||
4574 isteq(list[hdr].n, ist("upgrade")) ||
4575 isteq(list[hdr].n, ist("transfer-encoding")))
4576 continue;
4577
4578 if (isteq(list[hdr].n, ist("")))
4579 break; // end
4580
4581 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4582 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004583 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004584 goto realign_again;
4585 goto full;
4586 }
4587 }
4588
Christopher Faulet0b465482019-02-19 15:14:23 +01004589 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004590 * FIXME: we should also set it when we know for sure that the
4591 * content-length is zero as well as on 204/304
4592 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004593 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4594 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004595 es_now = 1;
4596
Willy Tarreau927b88b2019-03-04 08:03:25 +01004597 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004598 es_now = 1;
4599
4600 /* update the frame's size */
4601 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4602
4603 if (es_now)
4604 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4605
4606 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004607 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004608
4609 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4610 * 1xx responses, another HEADERS frame is expected.
4611 */
4612 if (h2s->status >= 200 || h2s->status == 101)
4613 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004614
Willy Tarreau115e83b2018-12-01 19:17:53 +01004615 if (es_now) {
4616 h2s->flags |= H2_SF_ES_SENT;
4617 if (h2s->st == H2_SS_OPEN)
4618 h2s->st = H2_SS_HLOC;
4619 else
4620 h2s_close(h2s);
4621 }
4622
4623 /* OK we could properly deliver the response */
4624
4625 /* remove all header blocks including the EOH and compute the
4626 * corresponding size.
4627 *
4628 * FIXME: We should remove everything when es_now is set.
4629 */
4630 ret = 0;
4631 idx = htx_get_head(htx);
4632 blk = htx_get_blk(htx, idx);
4633 while (blk != blk_end) {
4634 ret += htx_get_blksz(blk);
4635 blk = htx_remove_blk(htx, blk);
4636 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004637
Christopher Faulet316934d2019-05-15 14:22:48 +02004638 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4639 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004640 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004641 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004642 end:
4643 return ret;
4644 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004645 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4646 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004647 h2c->flags |= H2_CF_MUX_MFULL;
4648 h2s->flags |= H2_SF_BLK_MROOM;
4649 ret = 0;
4650 goto end;
4651 fail:
4652 /* unparsable HTX messages, too large ones to be produced in the local
4653 * list etc go here (unrecoverable errors).
4654 */
4655 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4656 ret = 0;
4657 goto end;
4658}
4659
Willy Tarreau80739692018-10-05 11:35:57 +02004660/* Try to send a HEADERS frame matching HTX request present in HTX message
4661 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4662 * must check the stream's status to detect any error which might have happened
4663 * subsequently to a successful send. The htx blocks are automatically removed
4664 * from the message. The htx message is assumed to be valid since produced from
4665 * the internal code, hence it contains a start line, an optional series of
4666 * header blocks and an end of header, otherwise an invalid frame could be
4667 * emitted and the resulting htx message could be left in an inconsistent state.
4668 */
4669static size_t h2s_htx_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
4670{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02004671 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau80739692018-10-05 11:35:57 +02004672 struct h2c *h2c = h2s->h2c;
4673 struct htx_blk *blk;
4674 struct htx_blk *blk_end;
4675 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004676 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02004677 struct htx_sl *sl;
Willy Tarreau053c1572019-02-01 16:13:59 +01004678 struct ist meth, path, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02004679 enum htx_blk_type type;
4680 int es_now = 0;
4681 int ret = 0;
4682 int hdr;
4683 int idx;
4684
4685 if (h2c_mux_busy(h2c, h2s)) {
4686 h2s->flags |= H2_SF_BLK_MBUSY;
4687 return 0;
4688 }
4689
Willy Tarreau80739692018-10-05 11:35:57 +02004690 /* determine the first block which must not be deleted, blk_end may
4691 * be NULL if all blocks have to be deleted.
4692 */
4693 idx = htx_get_head(htx);
4694 blk_end = NULL;
4695 while (idx != -1) {
4696 type = htx_get_blk_type(htx_get_blk(htx, idx));
4697 idx = htx_get_next(htx, idx);
4698 if (type == HTX_BLK_EOH) {
4699 if (idx != -1)
4700 blk_end = htx_get_blk(htx, idx);
4701 break;
4702 }
4703 }
4704
4705 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004706 blk = htx_get_head_blk(htx);
4707 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
4708 ALREADY_CHECKED(blk);
4709 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004710 meth = htx_sl_req_meth(sl);
4711 path = htx_sl_req_uri(sl);
4712
4713 /* and the rest of the headers, that we dump starting at header 0 */
4714 hdr = 0;
4715
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004716 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02004717 while ((idx = htx_get_next(htx, idx)) != -1) {
4718 blk = htx_get_blk(htx, idx);
4719 type = htx_get_blk_type(blk);
4720
4721 if (type == HTX_BLK_UNUSED)
4722 continue;
4723
4724 if (type != HTX_BLK_HDR)
4725 break;
4726
4727 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
4728 goto fail;
4729
4730 list[hdr].n = htx_get_blk_name(htx, blk);
4731 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004732 hdr++;
4733 }
4734
4735 /* marker for end of headers */
4736 list[hdr].n = ist("");
4737
Willy Tarreau9c218e72019-05-26 10:08:28 +02004738 mbuf = br_tail(h2c->mbuf);
4739 retry:
4740 if (!h2_get_buf(h2c, mbuf)) {
4741 h2c->flags |= H2_CF_MUX_MALLOC;
4742 h2s->flags |= H2_SF_BLK_MROOM;
4743 return 0;
4744 }
4745
Willy Tarreau80739692018-10-05 11:35:57 +02004746 chunk_reset(&outbuf);
4747
4748 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004749 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4750 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004751 break;
4752 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004753 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02004754 }
4755
4756 if (outbuf.size < 9)
4757 goto full;
4758
4759 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4760 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4761 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4762 outbuf.data = 9;
4763
4764 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01004765 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004766 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004767 goto realign_again;
4768 goto full;
4769 }
4770
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004771 /* RFC7540 #8.3: the CONNECT method must have :
4772 * - :authority set to the URI part (host:port)
4773 * - :method set to CONNECT
4774 * - :scheme and :path omitted
4775 */
4776 if (sl->info.req.meth != HTTP_METH_CONNECT) {
4777 /* encode the scheme which is always "https" (or 0x86 for "http") */
Christopher Faulet3b44c542019-06-14 10:46:51 +02004778 struct ist scheme;
4779
4780 if ((sl->flags & (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP)) == (HTX_SL_F_HAS_SCHM|HTX_SL_F_SCHM_HTTP))
4781 scheme = ist("http");
4782 else
4783 scheme = ist("https");
4784
4785 if (!hpack_encode_scheme(&outbuf, scheme)) {
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004786 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004787 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004788 goto realign_again;
4789 goto full;
4790 }
Willy Tarreau80739692018-10-05 11:35:57 +02004791
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004792 /* encode the path, which necessarily is the second one */
4793 if (!hpack_encode_path(&outbuf, path)) {
4794 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004795 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004796 goto realign_again;
4797 goto full;
4798 }
Willy Tarreau053c1572019-02-01 16:13:59 +01004799
4800 /* look for the Host header and place it in :authority */
4801 auth = ist2(NULL, 0);
4802 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4803 if (isteq(list[hdr].n, ist("")))
4804 break; // end
4805
4806 if (isteq(list[hdr].n, ist("host"))) {
4807 auth = list[hdr].v;
4808 break;
4809 }
4810 }
4811 }
4812 else {
4813 /* for CONNECT, :authority is taken from the path */
4814 auth = path;
4815 }
4816
4817 if (auth.ptr && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
4818 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004819 if (b_space_wraps(mbuf))
Willy Tarreau053c1572019-02-01 16:13:59 +01004820 goto realign_again;
4821 goto full;
Willy Tarreau80739692018-10-05 11:35:57 +02004822 }
4823
4824 /* encode all headers, stop at empty name */
4825 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4826 /* these ones do not exist in H2 and must be dropped. */
4827 if (isteq(list[hdr].n, ist("connection")) ||
Willy Tarreau053c1572019-02-01 16:13:59 +01004828 isteq(list[hdr].n, ist("host")) ||
Willy Tarreau80739692018-10-05 11:35:57 +02004829 isteq(list[hdr].n, ist("proxy-connection")) ||
4830 isteq(list[hdr].n, ist("keep-alive")) ||
4831 isteq(list[hdr].n, ist("upgrade")) ||
4832 isteq(list[hdr].n, ist("transfer-encoding")))
4833 continue;
4834
4835 if (isteq(list[hdr].n, ist("")))
4836 break; // end
4837
4838 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4839 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004840 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004841 goto realign_again;
4842 goto full;
4843 }
4844 }
4845
4846 /* we may need to add END_STREAM if we have no body :
4847 * - request already closed, or :
4848 * - no transfer-encoding, and :
4849 * - no content-length or content-length:0
4850 * Fixme: this doesn't take into account CONNECT requests.
4851 */
4852 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
4853 es_now = 1;
4854
4855 if (sl->flags & HTX_SL_F_BODYLESS)
4856 es_now = 1;
4857
Willy Tarreau927b88b2019-03-04 08:03:25 +01004858 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02004859 es_now = 1;
4860
4861 /* update the frame's size */
4862 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4863
4864 if (es_now)
4865 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4866
4867 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004868 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02004869 h2s->flags |= H2_SF_HEADERS_SENT;
4870 h2s->st = H2_SS_OPEN;
4871
Willy Tarreau80739692018-10-05 11:35:57 +02004872 if (es_now) {
4873 // trim any possibly pending data (eg: inconsistent content-length)
4874 h2s->flags |= H2_SF_ES_SENT;
4875 h2s->st = H2_SS_HLOC;
4876 }
4877
4878 /* remove all header blocks including the EOH and compute the
4879 * corresponding size.
4880 *
4881 * FIXME: We should remove everything when es_now is set.
4882 */
4883 ret = 0;
4884 idx = htx_get_head(htx);
4885 blk = htx_get_blk(htx, idx);
4886 while (blk != blk_end) {
4887 ret += htx_get_blksz(blk);
4888 blk = htx_remove_blk(htx, blk);
4889 }
4890
Christopher Faulet316934d2019-05-15 14:22:48 +02004891 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4892 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02004893 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004894 }
Willy Tarreau80739692018-10-05 11:35:57 +02004895
4896 end:
4897 return ret;
4898 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004899 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4900 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02004901 h2c->flags |= H2_CF_MUX_MFULL;
4902 h2s->flags |= H2_SF_BLK_MROOM;
4903 ret = 0;
4904 goto end;
4905 fail:
4906 /* unparsable HTX messages, too large ones to be produced in the local
4907 * list etc go here (unrecoverable errors).
4908 */
4909 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4910 ret = 0;
4911 goto end;
4912}
4913
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004914/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01004915 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
4916 * caller must check the stream's status to detect any error which might have
4917 * happened subsequently to a successful send. Returns the number of data bytes
Christopher Faulet54b5e212019-06-04 10:08:28 +02004918 * consumed, or zero if nothing done. Note that EOM count for 1 byte.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004919 */
Willy Tarreau98de12a2018-12-12 07:03:00 +01004920static size_t h2s_htx_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004921{
4922 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004923 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004924 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004925 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004926 size_t total = 0;
4927 int es_now = 0;
4928 int bsize; /* htx block size */
4929 int fsize; /* h2 frame size */
4930 struct htx_blk *blk;
4931 enum htx_blk_type type;
4932 int idx;
4933
4934 if (h2c_mux_busy(h2c, h2s)) {
4935 h2s->flags |= H2_SF_BLK_MBUSY;
4936 goto end;
4937 }
4938
Willy Tarreau98de12a2018-12-12 07:03:00 +01004939 htx = htx_from_buf(buf);
4940
Christopher Faulet54b5e212019-06-04 10:08:28 +02004941 /* We only come here with HTX_BLK_DATA blocks. However, while looping,
4942 * we can meet an HTX_BLK_EOM block that we'll leave to the caller to
4943 * handle.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004944 */
4945
4946 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01004947 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004948 goto end;
4949
4950 idx = htx_get_head(htx);
4951 blk = htx_get_blk(htx, idx);
Christopher Faulet54b5e212019-06-04 10:08:28 +02004952 type = htx_get_blk_type(blk); // DATA or EOM
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004953 bsize = htx_get_blksz(blk);
4954 fsize = bsize;
4955
Christopher Faulet54b5e212019-06-04 10:08:28 +02004956 if (type == HTX_BLK_EOM) {
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01004957 if (h2s->flags & H2_SF_ES_SENT) {
4958 /* ES already sent */
4959 htx_remove_blk(htx, blk);
4960 total++; // EOM counts as one byte
4961 count--;
4962 goto end;
4963 }
4964 }
4965 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01004966 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004967
Willy Tarreau9c218e72019-05-26 10:08:28 +02004968 mbuf = br_tail(h2c->mbuf);
4969 retry:
4970 if (!h2_get_buf(h2c, mbuf)) {
4971 h2c->flags |= H2_CF_MUX_MALLOC;
4972 h2s->flags |= H2_SF_BLK_MROOM;
4973 goto end;
4974 }
4975
Willy Tarreau98de12a2018-12-12 07:03:00 +01004976 /* Perform some optimizations to reduce the number of buffer copies.
4977 * First, if the mux's buffer is empty and the htx area contains
4978 * exactly one data block of the same size as the requested count, and
4979 * this count fits within the frame size, the stream's window size, and
4980 * the connection's window size, then it's possible to simply swap the
4981 * caller's buffer with the mux's output buffer and adjust offsets and
4982 * length to match the entire DATA HTX block in the middle. In this
4983 * case we perform a true zero-copy operation from end-to-end. This is
4984 * the situation that happens all the time with large files. Second, if
4985 * this is not possible, but the mux's output buffer is empty, we still
4986 * have an opportunity to avoid the copy to the intermediary buffer, by
4987 * making the intermediary buffer's area point to the output buffer's
4988 * area. In this case we want to skip the HTX header to make sure that
4989 * copies remain aligned and that this operation remains possible all
4990 * the time. This goes for headers, data blocks and any data extracted
4991 * from the HTX blocks.
4992 */
4993 if (unlikely(fsize == count &&
4994 htx->used == 1 && type == HTX_BLK_DATA &&
Willy Tarreau5a9c8752019-08-02 07:52:08 +02004995 fsize <= h2s_mws(h2s) && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004996 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004997
Willy Tarreaubcc45952019-05-26 10:05:50 +02004998 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01004999 /* Too bad there are data left there. We're willing to memcpy/memmove
5000 * up to 1/4 of the buffer, which means that it's OK to copy a large
5001 * frame into a buffer containing few data if it needs to be realigned,
5002 * and that it's also OK to copy few data without realigning. Otherwise
5003 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01005004 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005005 if (fsize + 9 <= b_room(mbuf) &&
5006 (b_data(mbuf) <= b_size(mbuf) / 4 ||
5007 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf))))
Willy Tarreau98de12a2018-12-12 07:03:00 +01005008 goto copy;
Willy Tarreau8ab128c2019-03-21 17:47:28 +01005009
Willy Tarreau9c218e72019-05-26 10:08:28 +02005010 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5011 goto retry;
5012
Willy Tarreau98de12a2018-12-12 07:03:00 +01005013 h2c->flags |= H2_CF_MUX_MFULL;
5014 h2s->flags |= H2_SF_BLK_MROOM;
5015 goto end;
5016 }
5017
5018 /* map an H2 frame to the HTX block so that we can put the
5019 * frame header there.
5020 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005021 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
5022 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01005023
5024 /* prepend an H2 DATA frame header just before the DATA block */
5025 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5026 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5027 h2_set_frame_size(outbuf.area, fsize);
5028
5029 /* update windows */
Willy Tarreau5a9c8752019-08-02 07:52:08 +02005030 h2s->sws -= fsize;
Willy Tarreau98de12a2018-12-12 07:03:00 +01005031 h2c->mws -= fsize;
5032
5033 /* and exchange with our old area */
5034 buf->area = old_area;
5035 buf->data = buf->head = 0;
5036 total += fsize;
5037 goto end;
5038 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01005039
Willy Tarreau98de12a2018-12-12 07:03:00 +01005040 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005041 /* for DATA and EOM we'll have to emit a frame, even if empty */
5042
5043 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005044 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5045 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005046 break;
5047 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005048 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005049 }
5050
5051 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02005052 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5053 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005054 h2c->flags |= H2_CF_MUX_MFULL;
5055 h2s->flags |= H2_SF_BLK_MROOM;
5056 goto end;
5057 }
5058
5059 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5060 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5061 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5062 outbuf.data = 9;
5063
5064 /* we have in <fsize> the exact number of bytes we need to copy from
5065 * the HTX buffer. We need to check this against the connection's and
5066 * the stream's send windows, and to ensure that this fits in the max
5067 * frame size and in the buffer's available space minus 9 bytes (for
5068 * the frame header). The connection's flow control is applied last so
5069 * that we can use a separate list of streams which are immediately
5070 * unblocked on window opening. Note: we don't implement padding.
5071 */
5072
5073 /* EOM is presented with bsize==1 but would lead to the emission of an
5074 * empty frame, thus we force it to zero here.
5075 */
5076 if (type == HTX_BLK_EOM)
5077 bsize = fsize = 0;
5078
5079 if (!fsize)
5080 goto send_empty;
5081
Willy Tarreau5a9c8752019-08-02 07:52:08 +02005082 if (h2s_mws(h2s) <= 0) {
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005083 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005084 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005085 LIST_DEL_INIT(&h2s->list);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005086 goto end;
5087 }
5088
Willy Tarreauee573762018-12-04 15:25:57 +01005089 if (fsize > count)
5090 fsize = count;
5091
Willy Tarreau5a9c8752019-08-02 07:52:08 +02005092 if (fsize > h2s_mws(h2s))
5093 fsize = h2s_mws(h2s); // >0
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005094
5095 if (h2c->mfs && fsize > h2c->mfs)
5096 fsize = h2c->mfs; // >0
5097
5098 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005099 /* It doesn't fit at once. If it at least fits once split and
5100 * the amount of data to move is low, let's defragment the
5101 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005102 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005103 if (b_space_wraps(mbuf) &&
5104 (fsize + 9 <= b_room(mbuf)) &&
5105 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005106 goto realign_again;
5107 fsize = outbuf.size - 9;
5108
5109 if (fsize <= 0) {
5110 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005111 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5112 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005113 h2c->flags |= H2_CF_MUX_MFULL;
5114 h2s->flags |= H2_SF_BLK_MROOM;
5115 goto end;
5116 }
5117 }
5118
5119 if (h2c->mws <= 0) {
5120 h2s->flags |= H2_SF_BLK_MFCTL;
5121 goto end;
5122 }
5123
5124 if (fsize > h2c->mws)
5125 fsize = h2c->mws;
5126
5127 /* now let's copy this this into the output buffer */
5128 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau5a9c8752019-08-02 07:52:08 +02005129 h2s->sws -= fsize;
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005130 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005131 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005132
5133 send_empty:
5134 /* update the frame's size */
5135 h2_set_frame_size(outbuf.area, fsize);
5136
5137 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5138 * meeting EOM. We should optimize this later.
5139 */
5140 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005141 total++; // EOM counts as one byte
5142 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005143 es_now = 1;
5144 }
5145
5146 if (es_now)
5147 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5148
5149 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005150 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005151
5152 /* consume incoming HTX block, including EOM */
5153 total += fsize;
5154 if (fsize == bsize) {
5155 htx_remove_blk(htx, blk);
5156 if (fsize)
5157 goto new_frame;
5158 } else {
5159 /* we've truncated this block */
5160 htx_cut_data_blk(htx, blk, fsize);
5161 }
5162
5163 if (es_now) {
5164 if (h2s->st == H2_SS_OPEN)
5165 h2s->st = H2_SS_HLOC;
5166 else
5167 h2s_close(h2s);
5168
5169 h2s->flags |= H2_SF_ES_SENT;
5170 }
5171
5172 end:
5173 return total;
5174}
5175
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005176/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5177 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5178 * processed. The caller must check the stream's status to detect any error
5179 * which might have happened subsequently to a successful send. The htx blocks
5180 * are automatically removed from the message. The htx message is assumed to be
5181 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005182 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005183 * as a single frame. The ES flag is always set.
5184 */
5185static size_t h2s_htx_make_trailers(struct h2s *h2s, struct htx *htx)
5186{
Christopher Faulete4ab11b2019-06-11 15:05:37 +02005187 struct http_hdr list[global.tune.max_http_hdr];
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005188 struct h2c *h2c = h2s->h2c;
5189 struct htx_blk *blk;
5190 struct htx_blk *blk_end;
5191 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005192 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005193 enum htx_blk_type type;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005194 int ret = 0;
5195 int hdr;
5196 int idx;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005197
5198 if (h2c_mux_busy(h2c, h2s)) {
5199 h2s->flags |= H2_SF_BLK_MBUSY;
5200 goto end;
5201 }
5202
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005203 /* determine the first block which must not be deleted, blk_end may
5204 * be NULL if all blocks have to be deleted. also get trailers.
5205 */
5206 idx = htx_get_head(htx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005207 blk_end = NULL;
5208
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005209 hdr = 0;
5210 while (idx != -1) {
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005211 blk = htx_get_blk(htx, idx);
5212 type = htx_get_blk_type(blk);
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005213 idx = htx_get_next(htx, idx);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005214 if (type == HTX_BLK_UNUSED)
5215 continue;
5216
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005217 if (type == HTX_BLK_EOT) {
5218 if (idx != -1)
5219 blk_end = blk;
5220 break;
5221 }
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005222 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005223 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005224
5225 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
5226 goto fail;
5227
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005228 list[hdr].n = htx_get_blk_name(htx, blk);
5229 list[hdr].v = htx_get_blk_value(htx, blk);
5230 hdr++;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005231 }
5232
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005233 /* marker for end of trailers */
5234 list[hdr].n = ist("");
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005235
Willy Tarreau9c218e72019-05-26 10:08:28 +02005236 mbuf = br_tail(h2c->mbuf);
5237 retry:
5238 if (!h2_get_buf(h2c, mbuf)) {
5239 h2c->flags |= H2_CF_MUX_MALLOC;
5240 h2s->flags |= H2_SF_BLK_MROOM;
5241 goto end;
5242 }
5243
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005244 chunk_reset(&outbuf);
5245
5246 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005247 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5248 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005249 break;
5250 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005251 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005252 }
5253
5254 if (outbuf.size < 9)
5255 goto full;
5256
5257 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5258 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5259 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5260 outbuf.data = 9;
5261
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005262 /* encode all headers */
5263 for (idx = 0; idx < hdr; idx++) {
5264 /* these ones do not exist in H2 or must not appear in
5265 * trailers and must be dropped.
5266 */
5267 if (isteq(list[idx].n, ist("host")) ||
5268 isteq(list[idx].n, ist("content-length")) ||
5269 isteq(list[idx].n, ist("connection")) ||
5270 isteq(list[idx].n, ist("proxy-connection")) ||
5271 isteq(list[idx].n, ist("keep-alive")) ||
5272 isteq(list[idx].n, ist("upgrade")) ||
5273 isteq(list[idx].n, ist("te")) ||
5274 isteq(list[idx].n, ist("transfer-encoding")))
5275 continue;
5276
5277 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5278 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005279 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005280 goto realign_again;
5281 goto full;
5282 }
5283 }
5284
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005285 if (outbuf.data == 9) {
5286 /* here we have a problem, we have nothing to emit (either we
5287 * received an empty trailers block followed or we removed its
5288 * contents above). Because of this we can't send a HEADERS
5289 * frame, so we have to cheat and instead send an empty DATA
5290 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005291 */
5292 outbuf.area[3] = H2_FT_DATA;
5293 outbuf.area[4] = H2_F_DATA_END_STREAM;
5294 }
5295
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005296 /* update the frame's size */
5297 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5298
5299 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005300 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005301 h2s->flags |= H2_SF_ES_SENT;
5302
5303 if (h2s->st == H2_SS_OPEN)
5304 h2s->st = H2_SS_HLOC;
5305 else
5306 h2s_close(h2s);
5307
5308 /* OK we could properly deliver the response */
5309 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005310 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005311 ret = 0;
5312 idx = htx_get_head(htx);
5313 blk = htx_get_blk(htx, idx);
5314 while (blk != blk_end) {
5315 ret += htx_get_blksz(blk);
5316 blk = htx_remove_blk(htx, blk);
5317 }
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005318
5319 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
5320 ret += htx_get_blksz(blk_end);
5321 htx_remove_blk(htx, blk_end);
5322 }
5323
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005324 end:
5325 return ret;
5326 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005327 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5328 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005329 h2c->flags |= H2_CF_MUX_MFULL;
5330 h2s->flags |= H2_SF_BLK_MROOM;
5331 ret = 0;
5332 goto end;
5333 fail:
5334 /* unparsable HTX messages, too large ones to be produced in the local
5335 * list etc go here (unrecoverable errors).
5336 */
5337 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5338 ret = 0;
5339 goto end;
5340}
5341
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005342/* Called from the upper layer, to subscribe to events, such as being able to send.
5343 * The <param> argument here is supposed to be a pointer to a wait_event struct
5344 * which will be passed to h2s->recv_wait or h2s->send_wait depending on the
5345 * event_type. The event_type must only be a combination of SUB_RETRY_RECV and
5346 * SUB_RETRY_SEND, other values will lead to -1 being returned. It always
5347 * returns 0 except for the error above.
5348 */
Olivier Houchard6ff20392018-07-17 18:46:31 +02005349static int h2_subscribe(struct conn_stream *cs, int event_type, void *param)
5350{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005351 struct wait_event *sw;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005352 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005353 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005354
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005355 if (event_type & SUB_RETRY_RECV) {
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005356 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005357 BUG_ON(h2s->recv_wait != NULL || (sw->events & SUB_RETRY_RECV));
5358 sw->events |= SUB_RETRY_RECV;
5359 h2s->recv_wait = sw;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005360 event_type &= ~SUB_RETRY_RECV;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005361 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005362 if (event_type & SUB_RETRY_SEND) {
Olivier Houchard6ff20392018-07-17 18:46:31 +02005363 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005364 BUG_ON(h2s->send_wait != NULL || (sw->events & SUB_RETRY_SEND));
5365 sw->events |= SUB_RETRY_SEND;
5366 h2s->send_wait = sw;
5367 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5368 !LIST_ADDED(&h2s->list)) {
5369 if (h2s->flags & H2_SF_BLK_MFCTL)
5370 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5371 else
5372 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005373 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005374 event_type &= ~SUB_RETRY_SEND;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005375 }
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005376 if (event_type != 0)
5377 return -1;
5378 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005379}
5380
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005381/* Called from the upper layer, to unsubscribe some events (undo h2_subscribe).
5382 * The <param> argument here is supposed to be a pointer to the same wait_event
5383 * struct that was passed to h2_subscribe() otherwise nothing will be changed.
5384 * It always returns zero.
5385 */
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005386static int h2_unsubscribe(struct conn_stream *cs, int event_type, void *param)
5387{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005388 struct wait_event *sw;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005389 struct h2s *h2s = cs->ctx;
5390
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005391 if (event_type & SUB_RETRY_RECV) {
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005392 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005393 BUG_ON(h2s->recv_wait != sw);
5394 sw->events &= ~SUB_RETRY_RECV;
5395 h2s->recv_wait = NULL;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005396 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005397 if (event_type & SUB_RETRY_SEND) {
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005398 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005399 BUG_ON(h2s->send_wait != sw);
5400 LIST_DEL(&h2s->list);
5401 LIST_INIT(&h2s->list);
5402 sw->events &= ~SUB_RETRY_SEND;
5403 /* We were about to send, make sure it does not happen */
5404 if (LIST_ADDED(&h2s->sending_list) &&
5405 h2s->send_wait != &h2s->wait_event) {
Willy Tarreau86eded62019-06-14 14:47:49 +02005406 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Olivier Houchardf8338152019-05-14 17:50:32 +02005407 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005408 }
Olivier Houchardf8338152019-05-14 17:50:32 +02005409 h2s->send_wait = NULL;
Olivier Houchardd846c262018-10-19 17:24:29 +02005410 }
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005411 return 0;
5412}
5413
5414
Olivier Houchard511efea2018-08-16 15:30:32 +02005415/* Called from the upper layer, to receive data */
5416static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5417{
Olivier Houchard638b7992018-08-16 15:41:52 +02005418 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005419 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005420 struct htx *h2s_htx = NULL;
5421 struct htx *buf_htx = NULL;
Olivier Houchard511efea2018-08-16 15:30:32 +02005422 size_t ret = 0;
5423
5424 /* transfer possibly pending data to the upper layer */
Willy Tarreau86724e22018-12-01 23:19:43 +01005425 if (h2c->proxy->options2 & PR_O2_USE_HTX) {
Willy Tarreau86724e22018-12-01 23:19:43 +01005426 h2s_htx = htx_from_buf(&h2s->rxbuf);
Olivier Houchard56b03482018-12-10 16:09:53 +01005427 if (htx_is_empty(h2s_htx)) {
Christopher Faulet37070b22019-02-14 15:12:14 +01005428 /* Here htx_to_buf() will set buffer data to 0 because
5429 * the HTX is empty.
5430 */
5431 htx_to_buf(h2s_htx, &h2s->rxbuf);
Willy Tarreau86724e22018-12-01 23:19:43 +01005432 goto end;
Olivier Houchard56b03482018-12-10 16:09:53 +01005433 }
Willy Tarreau86724e22018-12-01 23:19:43 +01005434
Christopher Faulet156852b2019-05-16 11:29:13 +02005435 ret = h2s_htx->data;
Willy Tarreau86724e22018-12-01 23:19:43 +01005436 buf_htx = htx_from_buf(buf);
Willy Tarreau86724e22018-12-01 23:19:43 +01005437
Christopher Faulet2f6edc82019-05-15 10:07:59 +02005438 /* <buf> is empty and the message is small enough, swap the
5439 * buffers. */
5440 if (htx_is_empty(buf_htx) && htx_used_space(h2s_htx) <= count) {
5441 htx_to_buf(buf_htx, buf);
5442 htx_to_buf(h2s_htx, &h2s->rxbuf);
5443 b_xfer(buf, &h2s->rxbuf, b_data(&h2s->rxbuf));
5444 goto end;
5445 }
5446
Christopher Faulet156852b2019-05-16 11:29:13 +02005447 htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005448
Christopher Fauleta61e97b2019-05-16 11:30:31 +02005449 if (h2s_htx->flags & HTX_FL_PARSING_ERROR) {
Willy Tarreau7196dd62019-03-05 10:51:11 +01005450 buf_htx->flags |= HTX_FL_PARSING_ERROR;
Christopher Fauleta61e97b2019-05-16 11:30:31 +02005451 if (htx_is_empty(buf_htx))
5452 cs->flags |= CS_FL_EOI;
5453 }
Willy Tarreau7196dd62019-03-05 10:51:11 +01005454
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01005455 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005456 htx_to_buf(buf_htx, buf);
5457 htx_to_buf(h2s_htx, &h2s->rxbuf);
Christopher Faulet156852b2019-05-16 11:29:13 +02005458 ret -= h2s_htx->data;
Willy Tarreau86724e22018-12-01 23:19:43 +01005459 }
5460 else {
5461 ret = b_xfer(buf, &h2s->rxbuf, count);
5462 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005463
Christopher Faulet37070b22019-02-14 15:12:14 +01005464 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005465 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005466 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005467 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005468 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005469 if (h2s->flags & H2_SF_ES_RCVD)
5470 cs->flags |= CS_FL_EOI;
Willy Tarreau76c83822019-06-15 09:55:50 +02005471 if (conn_xprt_read0_pending(h2c->conn) || h2s->st == H2_SS_CLOSED)
Olivier Houchard511efea2018-08-16 15:30:32 +02005472 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005473 if (cs->flags & CS_FL_ERR_PENDING)
5474 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005475 if (b_size(&h2s->rxbuf)) {
5476 b_free(&h2s->rxbuf);
5477 offer_buffers(NULL, tasks_run_queue);
5478 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005479 }
5480
Willy Tarreau082f5592018-11-25 08:03:32 +01005481 if (ret && h2c->dsi == h2s->id) {
5482 /* demux is blocking on this stream's buffer */
5483 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005484 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005485 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005486
Olivier Houchard511efea2018-08-16 15:30:32 +02005487 return ret;
5488}
5489
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005490/* stops all senders of this connection for example when the mux buffer is full.
5491 * They are moved from the sending_list to either fctl_list or send_list.
5492 */
Olivier Houchardd846c262018-10-19 17:24:29 +02005493static void h2_stop_senders(struct h2c *h2c)
5494{
5495 struct h2s *h2s, *h2s_back;
5496
Olivier Houchardd360ac62019-03-22 17:37:16 +01005497 list_for_each_entry_safe(h2s, h2s_back, &h2c->sending_list, sending_list) {
5498 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreau86eded62019-06-14 14:47:49 +02005499 tasklet_remove_from_tasklet_list(h2s->send_wait->tasklet);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005500 h2s->send_wait->events |= SUB_RETRY_SEND;
Olivier Houchardd846c262018-10-19 17:24:29 +02005501 }
5502}
5503
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005504/* Called from the upper layer, to send data from buffer <buf> for no more than
5505 * <count> bytes. Returns the number of bytes effectively sent. Some status
5506 * flags may be updated on the conn_stream.
5507 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005508static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005509{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005510 struct h2s *h2s = cs->ctx;
Olivier Houchard8122a8d2018-12-03 19:13:29 +01005511 size_t orig_count = count;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005512 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005513 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005514 struct htx *htx;
5515 struct htx_blk *blk;
5516 enum htx_blk_type btype;
5517 uint32_t bsize;
5518 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005519
Olivier Houchardd360ac62019-03-22 17:37:16 +01005520 /* If we were not just woken because we wanted to send but couldn't,
5521 * and there's somebody else that is waiting to send, do nothing,
5522 * we will subscribe later and be put at the end of the list
5523 */
Willy Tarreauc234ae32019-05-13 17:56:11 +02005524 if (!LIST_ADDED(&h2s->sending_list) &&
Olivier Houchardd360ac62019-03-22 17:37:16 +01005525 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list)))
5526 return 0;
Olivier Houchard998410a2019-04-15 19:23:37 +02005527 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01005528
Olivier Houchard998410a2019-04-15 19:23:37 +02005529 /* We couldn't set it to NULL before, because we needed it in case
5530 * we had to cancel the tasklet
5531 */
5532 h2s->send_wait = NULL;
5533
Willy Tarreau6bf641a2018-10-08 09:43:03 +02005534 if (h2s->h2c->st0 < H2_CS_FRAME_H)
5535 return 0;
5536
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005537 /* htx will be enough to decide if we're using HTX or legacy */
5538 htx = (h2s->h2c->proxy->options2 & PR_O2_USE_HTX) ? htx_from_buf(buf) : NULL;
5539
Willy Tarreau0bad0432018-06-14 16:54:01 +02005540 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01005541 h2s->flags |= H2_SF_OUTGOING_DATA;
5542
Willy Tarreau751f2d02018-10-05 09:35:00 +02005543 if (h2s->id == 0) {
5544 int32_t id = h2c_get_next_sid(h2s->h2c);
5545
5546 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02005547 cs->flags |= CS_FL_ERROR;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005548 return 0;
5549 }
5550
5551 eb32_delete(&h2s->by_id);
5552 h2s->by_id.key = h2s->id = id;
5553 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01005554 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005555 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
5556 }
5557
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005558 if (htx) {
Willy Tarreau2b778482019-05-06 15:00:22 +02005559 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
Willy Tarreauc14999b2018-12-06 14:09:09 +01005560 count && !htx_is_empty(htx)) {
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005561 idx = htx_get_head(htx);
5562 blk = htx_get_blk(htx, idx);
5563 btype = htx_get_blk_type(blk);
5564 bsize = htx_get_blksz(blk);
5565
5566 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02005567 case HTX_BLK_REQ_SL:
5568 /* start-line before headers */
5569 ret = h2s_htx_bck_make_req_headers(h2s, htx);
5570 if (ret > 0) {
5571 total += ret;
5572 count -= ret;
5573 if (ret < bsize)
5574 goto done;
5575 }
5576 break;
5577
Willy Tarreau115e83b2018-12-01 19:17:53 +01005578 case HTX_BLK_RES_SL:
5579 /* start-line before headers */
5580 ret = h2s_htx_frt_make_resp_headers(h2s, htx);
5581 if (ret > 0) {
5582 total += ret;
5583 count -= ret;
5584 if (ret < bsize)
5585 goto done;
5586 }
5587 break;
5588
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005589 case HTX_BLK_DATA:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005590 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005591 /* all these cause the emission of a DATA frame (possibly empty).
5592 * This EOM necessarily is one before trailers, as the EOM following
5593 * trailers would have been consumed by the trailers parser.
5594 */
Willy Tarreau98de12a2018-12-12 07:03:00 +01005595 ret = h2s_htx_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005596 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01005597 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005598 total += ret;
5599 count -= ret;
5600 if (ret < bsize)
5601 goto done;
5602 }
5603 break;
5604
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005605 case HTX_BLK_TLR:
Christopher Faulet2d7c5392019-06-03 10:41:26 +02005606 case HTX_BLK_EOT:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005607 /* This is the first trailers block, all the subsequent ones AND
5608 * the EOM will be swallowed by the parser.
5609 */
5610 ret = h2s_htx_make_trailers(h2s, htx);
5611 if (ret > 0) {
5612 total += ret;
5613 count -= ret;
5614 if (ret < bsize)
5615 goto done;
5616 }
5617 break;
5618
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005619 default:
5620 htx_remove_blk(htx, blk);
5621 total += bsize;
5622 count -= bsize;
5623 break;
5624 }
5625 }
5626 goto done;
5627 }
5628
5629 /* legacy transfer mode */
Willy Tarreaua40704a2018-09-11 13:52:04 +02005630 while (h2s->h1m.state < H1_MSG_DONE && count) {
Willy Tarreau001823c2018-09-12 17:25:32 +02005631 if (h2s->h1m.state <= H1_MSG_LAST_LF) {
Willy Tarreau80739692018-10-05 11:35:57 +02005632 if (h2s->h2c->flags & H2_CF_IS_BACK)
5633 ret = -1;
5634 else
5635 ret = h2s_frt_make_resp_headers(h2s, buf, total, count);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005636 }
Willy Tarreaua40704a2018-09-11 13:52:04 +02005637 else if (h2s->h1m.state < H1_MSG_TRAILERS) {
Willy Tarreau0bad0432018-06-14 16:54:01 +02005638 ret = h2s_frt_make_resp_data(h2s, buf, total, count);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005639 }
Willy Tarreaua40704a2018-09-11 13:52:04 +02005640 else if (h2s->h1m.state == H1_MSG_TRAILERS) {
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005641 /* consume the trailers if any (we don't forward them for now) */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005642 ret = h1_measure_trailers(buf, total, count);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005643
Willy Tarreau5dd17352018-06-14 13:33:30 +02005644 if (unlikely((int)ret <= 0)) {
5645 if ((int)ret < 0)
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005646 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5647 break;
5648 }
Willy Tarreau35a62702018-02-27 15:37:25 +01005649 // trim any possibly pending data (eg: extra CR-LF, ...)
Willy Tarreau0bad0432018-06-14 16:54:01 +02005650 total += count;
5651 count = 0;
Willy Tarreaua40704a2018-09-11 13:52:04 +02005652 h2s->h1m.state = H1_MSG_DONE;
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005653 break;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02005654 }
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005655 else {
Willy Tarreauec988c72018-12-19 18:00:29 +01005656 cs_set_error(cs);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005657 break;
5658 }
Willy Tarreau0bad0432018-06-14 16:54:01 +02005659
5660 total += ret;
5661 count -= ret;
5662
Willy Tarreau2b778482019-05-06 15:00:22 +02005663 if (h2s->st >= H2_SS_HLOC)
Willy Tarreau0bad0432018-06-14 16:54:01 +02005664 break;
5665
5666 if (h2s->flags & H2_SF_BLK_ANY)
5667 break;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005668 }
5669
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005670 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02005671 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02005672 /* trim any possibly pending data after we close (extra CR-LF,
5673 * unprocessed trailers, abnormal extra data, ...)
5674 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005675 total += count;
5676 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02005677 }
5678
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005679 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01005680 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreauec988c72018-12-19 18:00:29 +01005681 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01005682 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01005683 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005684 }
5685
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005686 if (htx) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005687 htx_to_buf(htx, buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005688 } else {
5689 b_del(buf, total);
5690 }
Olivier Houchardd846c262018-10-19 17:24:29 +02005691
5692 /* The mux is full, cancel the pending tasks */
5693 if ((h2s->h2c->flags & H2_CF_MUX_BLOCK_ANY) ||
5694 (h2s->flags & H2_SF_BLK_MBUSY))
5695 h2_stop_senders(h2s->h2c);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005696
Olivier Houchard8122a8d2018-12-03 19:13:29 +01005697 /* If we're running HTX, and we read the whole buffer, then pretend
5698 * we read exactly what the caller specified, as with HTX the caller
5699 * will always give the buffer size, instead of the amount of data
5700 * available.
5701 */
5702 if (htx && !b_data(buf))
5703 total = orig_count;
5704
Olivier Houchard7505f942018-08-21 18:10:44 +02005705 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005706 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Willy Tarreau3c39a7d2019-06-14 14:42:29 +02005707 tasklet_wakeup(h2s->h2c->wait_event.tasklet);
Olivier Houchardd846c262018-10-19 17:24:29 +02005708
Olivier Houchard7505f942018-08-21 18:10:44 +02005709 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01005710 /* If we're waiting for flow control, and we got a shutr on the
5711 * connection, we will never be unlocked, so add an error on
5712 * the conn_stream.
5713 */
5714 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
5715 !b_data(&h2s->h2c->dbuf) &&
5716 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
5717 if (cs->flags & CS_FL_EOS)
5718 cs->flags |= CS_FL_ERROR;
5719 else
5720 cs->flags |= CS_FL_ERR_PENDING;
5721 }
Olivier Houchard998410a2019-04-15 19:23:37 +02005722 if (total > 0) {
Olivier Houchardd360ac62019-03-22 17:37:16 +01005723 /* Ok we managed to send something, leave the send_list */
Olivier Houchardd360ac62019-03-22 17:37:16 +01005724 LIST_DEL_INIT(&h2s->list);
5725 }
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005726 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02005727}
5728
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005729/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02005730static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005731{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01005732 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01005733 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005734 struct eb32_node *node;
5735 int fctl_cnt = 0;
5736 int send_cnt = 0;
5737 int tree_cnt = 0;
5738 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02005739 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005740
5741 if (!h2c)
5742 return;
5743
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005744 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005745 fctl_cnt++;
5746
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005747 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005748 send_cnt++;
5749
Willy Tarreau3af37712018-12-18 14:34:41 +01005750 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005751 node = eb32_first(&h2c->streams_by_id);
5752 while (node) {
5753 h2s = container_of(node, struct h2s, by_id);
5754 tree_cnt++;
5755 if (!h2s->cs)
5756 orph_cnt++;
5757 node = eb32_next(node);
5758 }
5759
Willy Tarreau60f62682019-05-26 11:32:27 +02005760 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005761 tmbuf = br_tail(h2c->mbuf);
Willy Tarreau987c0632018-12-18 10:32:05 +01005762 chunk_appendf(msg, " h2c.st0=%d .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
5763 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02005764 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
5765 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreau616ac812018-07-24 14:12:42 +02005766 h2c->st0, h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
5767 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005768 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01005769 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
5770 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
5771 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02005772 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
5773 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
5774 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02005775 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
5776 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01005777
5778 if (h2s) {
5779 chunk_appendf(msg, " last_h2s=%p .id=%d .flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
5780 h2s, h2s->id, h2s->flags,
5781 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
5782 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
5783 h2s->cs);
5784 if (h2s->cs)
5785 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
5786 h2s->cs->flags, h2s->cs->data);
5787 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005788}
Willy Tarreau62f52692017-10-08 23:01:42 +02005789
5790/*******************************************************/
5791/* functions below are dedicated to the config parsers */
5792/*******************************************************/
5793
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005794/* config parser for global "tune.h2.header-table-size" */
5795static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
5796 struct proxy *defpx, const char *file, int line,
5797 char **err)
5798{
5799 if (too_many_args(1, args, err, NULL))
5800 return -1;
5801
5802 h2_settings_header_table_size = atoi(args[1]);
5803 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
5804 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
5805 return -1;
5806 }
5807 return 0;
5808}
Willy Tarreau62f52692017-10-08 23:01:42 +02005809
Willy Tarreaue6baec02017-07-27 11:45:11 +02005810/* config parser for global "tune.h2.initial-window-size" */
5811static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
5812 struct proxy *defpx, const char *file, int line,
5813 char **err)
5814{
5815 if (too_many_args(1, args, err, NULL))
5816 return -1;
5817
5818 h2_settings_initial_window_size = atoi(args[1]);
5819 if (h2_settings_initial_window_size < 0) {
5820 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5821 return -1;
5822 }
5823 return 0;
5824}
5825
Willy Tarreau5242ef82017-07-27 11:47:28 +02005826/* config parser for global "tune.h2.max-concurrent-streams" */
5827static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
5828 struct proxy *defpx, const char *file, int line,
5829 char **err)
5830{
5831 if (too_many_args(1, args, err, NULL))
5832 return -1;
5833
5834 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01005835 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02005836 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5837 return -1;
5838 }
5839 return 0;
5840}
5841
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005842/* config parser for global "tune.h2.max-frame-size" */
5843static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
5844 struct proxy *defpx, const char *file, int line,
5845 char **err)
5846{
5847 if (too_many_args(1, args, err, NULL))
5848 return -1;
5849
5850 h2_settings_max_frame_size = atoi(args[1]);
5851 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
5852 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
5853 return -1;
5854 }
5855 return 0;
5856}
5857
Willy Tarreau62f52692017-10-08 23:01:42 +02005858
5859/****************************************/
5860/* MUX initialization and instanciation */
5861/***************************************/
5862
5863/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01005864static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02005865 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02005866 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02005867 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02005868 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02005869 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005870 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02005871 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01005872 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02005873 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01005874 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01005875 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01005876 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02005877 .shutr = h2_shutr,
5878 .shutw = h2_shutw,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005879 .show_fd = h2_show_fd,
Willy Tarreau28f1cb92017-12-20 16:14:44 +01005880 .flags = MX_FL_CLEAN_ABRT,
Willy Tarreau62f52692017-10-08 23:01:42 +02005881 .name = "H2",
5882};
5883
Christopher Faulet32f61c02018-04-10 14:33:41 +02005884/* PROTO selection : this mux registers PROTO token "h2" */
5885static struct mux_proto_list mux_proto_h2 =
Willy Tarreauf8957272018-10-03 10:25:20 +02005886 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_FE, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02005887
Willy Tarreau0108d902018-11-25 19:14:37 +01005888INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
5889
Christopher Faulet9b579102019-04-11 22:52:25 +02005890
5891/* The mux operations */
5892static const struct mux_ops h2_htx_ops = {
5893 .init = h2_init,
5894 .wake = h2_wake,
5895 .snd_buf = h2_snd_buf,
5896 .rcv_buf = h2_rcv_buf,
5897 .subscribe = h2_subscribe,
5898 .unsubscribe = h2_unsubscribe,
5899 .attach = h2_attach,
5900 .get_first_cs = h2_get_first_cs,
5901 .detach = h2_detach,
5902 .destroy = h2_destroy,
5903 .avail_streams = h2_avail_streams,
5904 .used_streams = h2_used_streams,
5905 .shutr = h2_shutr,
5906 .shutw = h2_shutw,
5907 .show_fd = h2_show_fd,
Christopher Faulet9f38f5a2019-04-03 09:53:32 +02005908 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX,
Christopher Faulet9b579102019-04-11 22:52:25 +02005909 .name = "H2",
5910};
5911
Willy Tarreauf8957272018-10-03 10:25:20 +02005912static struct mux_proto_list mux_proto_h2_htx =
Christopher Faulet9b579102019-04-11 22:52:25 +02005913 { .token = IST("h2"), .mode = PROTO_MODE_HTX, .side = PROTO_SIDE_BOTH, .mux = &h2_htx_ops };
Willy Tarreauf8957272018-10-03 10:25:20 +02005914
5915INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2_htx);
5916
Willy Tarreau62f52692017-10-08 23:01:42 +02005917/* config keyword parsers */
5918static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005919 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02005920 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02005921 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005922 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02005923 { 0, NULL, NULL }
5924}};
5925
Willy Tarreau0108d902018-11-25 19:14:37 +01005926INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);