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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)
160#define H2_SS_EOS_BITS (H2_SS_CLOSED_BIT|H2_SS_ERROR_BIT|H2_SS_HREM_BIT)
161
Willy Tarreau18312642017-10-11 07:57:07 +0200162/* HTTP/2 stream flags (32 bit), in h2s->flags */
163#define H2_SF_NONE 0x00000000
164#define H2_SF_ES_RCVD 0x00000001
165#define H2_SF_ES_SENT 0x00000002
166
167#define H2_SF_RST_RCVD 0x00000004 // received RST_STREAM
168#define H2_SF_RST_SENT 0x00000008 // sent RST_STREAM
169
Willy Tarreau2e5b60e2017-09-25 11:49:03 +0200170/* stream flags indicating the reason the stream is blocked */
171#define H2_SF_BLK_MBUSY 0x00000010 // blocked waiting for mux access (transient)
172#define H2_SF_BLK_MROOM 0x00000020 // blocked waiting for room in the mux
173#define H2_SF_BLK_MFCTL 0x00000040 // blocked due to mux fctl
174#define H2_SF_BLK_SFCTL 0x00000080 // blocked due to stream fctl
175#define H2_SF_BLK_ANY 0x000000F0 // any of the reasons above
176
Willy Tarreau454f9052017-10-26 19:40:35 +0200177/* stream flags indicating how data is supposed to be sent */
178#define H2_SF_DATA_CLEN 0x00000100 // data sent using content-length
179#define H2_SF_DATA_CHNK 0x00000200 // data sent using chunked-encoding
180
181/* step we're currently in when sending chunks. This is needed because we may
182 * have to transfer chunks as large as a full buffer so there's no room left
183 * for size nor crlf around.
184 */
185#define H2_SF_CHNK_SIZE 0x00000000 // trying to send chunk size
186#define H2_SF_CHNK_DATA 0x00000400 // trying to send chunk data
187#define H2_SF_CHNK_CRLF 0x00000800 // trying to send chunk crlf after data
188
189#define H2_SF_CHNK_MASK 0x00000C00 // trying to send chunk size
190
Willy Tarreau67434202017-11-06 20:20:51 +0100191#define H2_SF_HEADERS_SENT 0x00001000 // a HEADERS frame was sent for this stream
Willy Tarreauc4312d32017-11-07 12:01:53 +0100192#define H2_SF_OUTGOING_DATA 0x00002000 // set whenever we've seen outgoing data
Willy Tarreau67434202017-11-06 20:20:51 +0100193
Willy Tarreau6cc85a52019-01-02 15:49:20 +0100194#define H2_SF_HEADERS_RCVD 0x00004000 // a HEADERS frame was received for this stream
195
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200196#define H2_SF_WANT_SHUTR 0x00008000 // a stream couldn't shutr() (mux full/busy)
197#define H2_SF_WANT_SHUTW 0x00010000 // a stream couldn't shutw() (mux full/busy)
Willy Tarreau3cf69fe2019-05-14 10:44:40 +0200198#define H2_SF_KILL_CONN 0x00020000 // kill the whole connection with this stream
Willy Tarreau2c249eb2019-05-13 18:06:17 +0200199
200
Willy Tarreau18312642017-10-11 07:57:07 +0200201/* H2 stream descriptor, describing the stream as it appears in the H2C, and as
202 * it is being processed in the internal HTTP representation (H1 for now).
203 */
204struct h2s {
205 struct conn_stream *cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +0100206 struct session *sess;
Willy Tarreau18312642017-10-11 07:57:07 +0200207 struct h2c *h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +0200208 struct h1m h1m; /* request or response parser state for H1 */
Willy Tarreau18312642017-10-11 07:57:07 +0200209 struct eb32_node by_id; /* place in h2c's streams_by_id */
Willy Tarreau18312642017-10-11 07:57:07 +0200210 int32_t id; /* stream ID */
211 uint32_t flags; /* H2_SF_* */
212 int mws; /* mux window size for this stream */
213 enum h2_err errcode; /* H2 err code (H2_ERR_*) */
214 enum h2_ss st;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200215 uint16_t status; /* HTTP response status */
Willy Tarreau1915ca22019-01-24 11:49:37 +0100216 unsigned long long body_len; /* remaining body length according to content-length if H2_SF_DATA_CLEN */
Olivier Houchard638b7992018-08-16 15:41:52 +0200217 struct buffer rxbuf; /* receive buffer, always valid (buf_empty or real buffer) */
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200218 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 +0100219 struct wait_event *recv_wait; /* recv wait_event the conn_stream associated is waiting on (via h2_subscribe) */
220 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 +0200221 struct list list; /* To be used when adding in h2c->send_list or h2c->fctl_lsit */
Olivier Houchardd360ac62019-03-22 17:37:16 +0100222 struct list sending_list; /* To be used when adding in h2c->sending_list */
Willy Tarreau18312642017-10-11 07:57:07 +0200223};
Willy Tarreau5ab6b572017-09-22 08:05:00 +0200224
Willy Tarreauc6405142017-09-21 20:23:50 +0200225/* descriptor for an h2 frame header */
226struct h2_fh {
227 uint32_t len; /* length, host order, 24 bits */
228 uint32_t sid; /* stream id, host order, 31 bits */
229 uint8_t ft; /* frame type */
230 uint8_t ff; /* frame flags */
231};
232
Willy Tarreau8ceae722018-11-26 11:58:30 +0100233/* the h2c connection pool */
234DECLARE_STATIC_POOL(pool_head_h2c, "h2c", sizeof(struct h2c));
235
236/* the h2s stream pool */
237DECLARE_STATIC_POOL(pool_head_h2s, "h2s", sizeof(struct h2s));
238
Willy Tarreaudc572362018-12-12 08:08:05 +0100239/* The default connection window size is 65535, it may only be enlarged using
240 * a WINDOW_UPDATE message. Since the window must never be larger than 2G-1,
241 * we'll pretend we already received the difference between the two to send
242 * an equivalent window update to enlarge it to 2G-1.
243 */
244#define H2_INITIAL_WINDOW_INCREMENT ((1U<<31)-1 - 65535)
245
Willy Tarreau455d5682019-05-24 19:42:18 +0200246/* maximum amount of data we're OK with re-aligning for buffer optimizations */
247#define MAX_DATA_REALIGN 1024
248
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200249/* a few settings from the global section */
250static int h2_settings_header_table_size = 4096; /* initial value */
Willy Tarreaue6baec02017-07-27 11:45:11 +0200251static int h2_settings_initial_window_size = 65535; /* initial value */
Willy Tarreau5a490b62019-01-31 10:39:51 +0100252static unsigned int h2_settings_max_concurrent_streams = 100;
Willy Tarreaua24b35c2019-02-21 13:24:36 +0100253static int h2_settings_max_frame_size = 0; /* unset */
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200254
Willy Tarreau2a856182017-05-16 15:20:39 +0200255/* a dmumy closed stream */
256static const struct h2s *h2_closed_stream = &(const struct h2s){
257 .cs = NULL,
258 .h2c = NULL,
259 .st = H2_SS_CLOSED,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100260 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreauab837502017-12-27 15:07:30 +0100261 .flags = H2_SF_RST_RCVD,
Willy Tarreau2a856182017-05-16 15:20:39 +0200262 .id = 0,
263};
264
Willy Tarreauecb9dcd2019-01-03 12:00:17 +0100265/* a dmumy closed stream returning a PROTOCOL_ERROR error */
266static const struct h2s *h2_error_stream = &(const struct h2s){
267 .cs = NULL,
268 .h2c = NULL,
269 .st = H2_SS_CLOSED,
270 .errcode = H2_ERR_PROTOCOL_ERROR,
271 .flags = 0,
272 .id = 0,
273};
274
Willy Tarreau8d0d58b2018-12-23 18:29:12 +0100275/* a dmumy closed stream returning a REFUSED_STREAM error */
276static const struct h2s *h2_refused_stream = &(const struct h2s){
277 .cs = NULL,
278 .h2c = NULL,
279 .st = H2_SS_CLOSED,
280 .errcode = H2_ERR_REFUSED_STREAM,
281 .flags = 0,
282 .id = 0,
283};
284
Willy Tarreau2a856182017-05-16 15:20:39 +0200285/* and a dummy idle stream for use with any unannounced stream */
286static const struct h2s *h2_idle_stream = &(const struct h2s){
287 .cs = NULL,
288 .h2c = NULL,
289 .st = H2_SS_IDLE,
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +0100290 .errcode = H2_ERR_STREAM_CLOSED,
Willy Tarreau2a856182017-05-16 15:20:39 +0200291 .id = 0,
292};
293
Olivier Houchard9f6af332018-05-25 14:04:04 +0200294static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +0200295static int h2_send(struct h2c *h2c);
296static int h2_recv(struct h2c *h2c);
Olivier Houchard7505f942018-08-21 18:10:44 +0200297static int h2_process(struct h2c *h2c);
Olivier Houchard29fb89d2018-08-02 18:56:36 +0200298static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short state);
Willy Tarreau0b559072018-02-26 15:22:17 +0100299static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id);
Willy Tarreau4790f7c2019-01-24 11:33:02 +0100300static 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 +0100301static int h2_frt_transfer_data(struct h2s *h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +0200302static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state);
Olivier Houchardf502aca2018-12-14 19:42:40 +0100303static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess);
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100304static void h2s_alert(struct h2s *h2s);
Willy Tarreaufe20e5b2017-07-27 11:42:14 +0200305
Olivier Houchard7a977432019-03-21 15:47:13 +0100306static __inline int
307h2c_is_dead(struct h2c *h2c)
308{
309 if (eb_is_empty(&h2c->streams_by_id) && /* don't close if streams exist */
310 ((h2c->conn->flags & CO_FL_ERROR) || /* errors close immediately */
311 (h2c->st0 >= H2_CS_ERROR && !h2c->task) || /* a timeout stroke earlier */
312 (!(h2c->conn->owner)) || /* Nobody's left to take care of the connection, drop it now */
Willy Tarreau662fafc2019-05-26 09:43:07 +0200313 (!br_data(h2c->mbuf) && /* mux buffer empty, also process clean events below */
Olivier Houchard7a977432019-03-21 15:47:13 +0100314 (conn_xprt_read0_pending(h2c->conn) ||
315 (h2c->last_sid >= 0 && h2c->max_id >= h2c->last_sid)))))
316 return 1;
317
318 return 0;
Olivier Houchard7a977432019-03-21 15:47:13 +0100319}
320
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200321/*****************************************************/
322/* functions below are for dynamic buffer management */
323/*****************************************************/
324
Willy Tarreau315d8072017-12-10 22:17:57 +0100325/* indicates whether or not the we may call the h2_recv() function to attempt
326 * to receive data into the buffer and/or demux pending data. The condition is
327 * a bit complex due to some API limits for now. The rules are the following :
328 * - if an error or a shutdown was detected on the connection and the buffer
329 * is empty, we must not attempt to receive
330 * - if the demux buf failed to be allocated, we must not try to receive and
331 * we know there is nothing pending
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100332 * - if no flag indicates a blocking condition, we may attempt to receive,
333 * regardless of whether the demux buffer is full or not, so that only
334 * de demux part decides whether or not to block. This is needed because
335 * the connection API indeed prevents us from re-enabling receipt that is
336 * already enabled in a polled state, so we must always immediately stop
337 * as soon as the demux can't proceed so as never to hit an end of read
338 * with data pending in the buffers.
Willy Tarreau315d8072017-12-10 22:17:57 +0100339 * - otherwise must may not attempt
340 */
341static inline int h2_recv_allowed(const struct h2c *h2c)
342{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200343 if (b_data(&h2c->dbuf) == 0 &&
Willy Tarreau315d8072017-12-10 22:17:57 +0100344 (h2c->st0 >= H2_CS_ERROR ||
345 h2c->conn->flags & CO_FL_ERROR ||
346 conn_xprt_read0_pending(h2c->conn)))
347 return 0;
348
349 if (!(h2c->flags & H2_CF_DEM_DALLOC) &&
Willy Tarreau6042aeb2017-12-12 11:01:44 +0100350 !(h2c->flags & H2_CF_DEM_BLOCK_ANY))
Willy Tarreau315d8072017-12-10 22:17:57 +0100351 return 1;
352
353 return 0;
354}
355
Willy Tarreau47b515a2018-12-21 16:09:41 +0100356/* restarts reading on the connection if it was not enabled */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200357static inline void h2c_restart_reading(const struct h2c *h2c, int consider_buffer)
Willy Tarreau47b515a2018-12-21 16:09:41 +0100358{
359 if (!h2_recv_allowed(h2c))
360 return;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200361 if ((!consider_buffer || !b_data(&h2c->dbuf))
362 && (h2c->wait_event.events & SUB_RETRY_RECV))
Willy Tarreau47b515a2018-12-21 16:09:41 +0100363 return;
364 tasklet_wakeup(h2c->wait_event.task);
365}
366
367
Willy Tarreaufa1d3572019-01-31 10:31:51 +0100368/* returns true if the front connection has too many conn_streams attached */
369static inline int h2_frt_has_too_many_cs(const struct h2c *h2c)
Willy Tarreauf2101912018-07-19 10:11:38 +0200370{
Willy Tarreaua8754662018-12-23 20:43:58 +0100371 return h2c->nb_cs > h2_settings_max_concurrent_streams;
Willy Tarreauf2101912018-07-19 10:11:38 +0200372}
373
Willy Tarreau44e973f2018-03-01 17:49:30 +0100374/* Tries to grab a buffer and to re-enable processing on mux <target>. The h2c
375 * flags are used to figure what buffer was requested. It returns 1 if the
376 * allocation succeeds, in which case the connection is woken up, or 0 if it's
377 * impossible to wake up and we prefer to be woken up later.
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200378 */
Willy Tarreau44e973f2018-03-01 17:49:30 +0100379static int h2_buf_available(void *target)
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200380{
381 struct h2c *h2c = target;
Willy Tarreau0b559072018-02-26 15:22:17 +0100382 struct h2s *h2s;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200383
Willy Tarreau44e973f2018-03-01 17:49:30 +0100384 if ((h2c->flags & H2_CF_DEM_DALLOC) && b_alloc_margin(&h2c->dbuf, 0)) {
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200385 h2c->flags &= ~H2_CF_DEM_DALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200386 h2c_restart_reading(h2c, 1);
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200387 return 1;
388 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200389
Willy Tarreau51330962019-05-26 09:38:07 +0200390 if ((h2c->flags & H2_CF_MUX_MALLOC) && b_alloc_margin(br_tail(h2c->mbuf), 0)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100391 h2c->flags &= ~H2_CF_MUX_MALLOC;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200392
393 if (h2c->flags & H2_CF_DEM_MROOM) {
394 h2c->flags &= ~H2_CF_DEM_MROOM;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200395 h2c_restart_reading(h2c, 1);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +0200396 }
Willy Tarreau14398122017-09-22 14:26:04 +0200397 return 1;
398 }
Willy Tarreau0b559072018-02-26 15:22:17 +0100399
400 if ((h2c->flags & H2_CF_DEM_SALLOC) &&
401 (h2s = h2c_st_by_id(h2c, h2c->dsi)) && h2s->cs &&
Olivier Houchard638b7992018-08-16 15:41:52 +0200402 b_alloc_margin(&h2s->rxbuf, 0)) {
Willy Tarreau0b559072018-02-26 15:22:17 +0100403 h2c->flags &= ~H2_CF_DEM_SALLOC;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200404 h2c_restart_reading(h2c, 1);
Willy Tarreau0b559072018-02-26 15:22:17 +0100405 return 1;
406 }
407
Willy Tarreau14398122017-09-22 14:26:04 +0200408 return 0;
409}
410
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200411static inline struct buffer *h2_get_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200412{
413 struct buffer *buf = NULL;
414
Willy Tarreauc234ae32019-05-13 17:56:11 +0200415 if (likely(!LIST_ADDED(&h2c->buf_wait.list)) &&
Willy Tarreau44e973f2018-03-01 17:49:30 +0100416 unlikely((buf = b_alloc_margin(bptr, 0)) == NULL)) {
417 h2c->buf_wait.target = h2c;
418 h2c->buf_wait.wakeup_cb = h2_buf_available;
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100419 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100420 LIST_ADDQ(&buffer_wq, &h2c->buf_wait.list);
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100421 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau14398122017-09-22 14:26:04 +0200422 __conn_xprt_stop_recv(h2c->conn);
423 }
424 return buf;
425}
426
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200427static inline void h2_release_buf(struct h2c *h2c, struct buffer *bptr)
Willy Tarreau14398122017-09-22 14:26:04 +0200428{
Willy Tarreauc9fa0482018-07-10 17:43:27 +0200429 if (bptr->size) {
Willy Tarreau44e973f2018-03-01 17:49:30 +0100430 b_free(bptr);
Olivier Houchard673867c2018-05-25 16:58:52 +0200431 offer_buffers(h2c->buf_wait.target, tasks_run_queue);
Willy Tarreau14398122017-09-22 14:26:04 +0200432 }
433}
434
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200435static inline void h2_release_mbuf(struct h2c *h2c)
436{
437 struct buffer *buf;
438 unsigned int count = 0;
439
440 while (b_size(buf = br_head_pick(h2c->mbuf))) {
441 b_free(buf);
442 count++;
443 }
444 if (count)
445 offer_buffers(h2c->buf_wait.target, tasks_run_queue);
446}
447
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100448/* returns the number of allocatable outgoing streams for the connection taking
449 * the last_sid and the reserved ones into account.
450 */
451static inline int h2_streams_left(const struct h2c *h2c)
452{
453 int ret;
454
455 /* consider the number of outgoing streams we're allowed to create before
456 * reaching the last GOAWAY frame seen. max_id is the last assigned id,
457 * nb_reserved is the number of streams which don't yet have an ID.
458 */
459 ret = (h2c->last_sid >= 0) ? h2c->last_sid : 0x7FFFFFFF;
460 ret = (unsigned int)(ret - h2c->max_id) / 2 - h2c->nb_reserved - 1;
461 if (ret < 0)
462 ret = 0;
463 return ret;
464}
465
Willy Tarreau00f18a32019-01-26 12:19:01 +0100466/* returns the number of streams in use on a connection to figure if it's
467 * idle or not. We check nb_cs and not nb_streams as the caller will want
468 * to know if it was the last one after a detach().
469 */
470static int h2_used_streams(struct connection *conn)
471{
472 struct h2c *h2c = conn->ctx;
473
474 return h2c->nb_cs;
475}
476
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100477/* returns the number of concurrent streams available on the connection */
Olivier Houchardd540b362018-11-05 18:37:53 +0100478static int h2_avail_streams(struct connection *conn)
479{
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100480 struct server *srv = objt_server(conn->target);
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100481 struct h2c *h2c = conn->ctx;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100482 int ret1, ret2;
Olivier Houchardd540b362018-11-05 18:37:53 +0100483
Willy Tarreau6afec462019-01-28 06:40:19 +0100484 /* RFC7540#6.8: Receivers of a GOAWAY frame MUST NOT open additional
485 * streams on the connection.
486 */
487 if (h2c->last_sid >= 0)
488 return 0;
489
Willy Tarreau86949782019-01-31 10:42:05 +0100490 /* note: may be negative if a SETTINGS frame changes the limit */
491 ret1 = h2c->streams_limit - h2c->nb_streams;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100492
493 /* we must also consider the limit imposed by stream IDs */
494 ret2 = h2_streams_left(h2c);
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100495 ret1 = MIN(ret1, ret2);
Willy Tarreau86949782019-01-31 10:42:05 +0100496 if (ret1 > 0 && srv && srv->max_reuse >= 0) {
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100497 ret2 = h2c->stream_cnt <= srv->max_reuse ? srv->max_reuse - h2c->stream_cnt + 1: 0;
498 ret1 = MIN(ret1, ret2);
499 }
500 return ret1;
Olivier Houchardd540b362018-11-05 18:37:53 +0100501}
502
Willy Tarreau35dbd5d2017-09-22 09:13:49 +0200503
Willy Tarreau62f52692017-10-08 23:01:42 +0200504/*****************************************************************/
505/* functions below are dedicated to the mux setup and management */
506/*****************************************************************/
507
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200508/* Initialize the mux once it's attached. For outgoing connections, the context
509 * is already initialized before installing the mux, so we detect incoming
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200510 * connections from the fact that the context is still NULL (even during mux
511 * upgrades). <input> is always used as Input buffer and may contain data. It is
512 * the caller responsibility to not reuse it anymore. Returns < 0 on error.
Willy Tarreau7dc24e42018-10-03 13:52:41 +0200513 */
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200514static int h2_init(struct connection *conn, struct proxy *prx, struct session *sess,
515 struct buffer *input)
Willy Tarreau32218eb2017-09-22 08:07:25 +0200516{
517 struct h2c *h2c;
Willy Tarreauea392822017-10-31 10:02:25 +0100518 struct task *t = NULL;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200519
Willy Tarreaubafbe012017-11-24 17:34:44 +0100520 h2c = pool_alloc(pool_head_h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200521 if (!h2c)
mildiscd2d7de2018-10-02 16:44:18 +0200522 goto fail_no_h2c;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200523
Christopher Faulete9b70722019-04-08 10:46:02 +0200524 if (conn_is_back(conn)) {
Willy Tarreau01b44822018-10-03 14:26:37 +0200525 h2c->flags = H2_CF_IS_BACK;
526 h2c->shut_timeout = h2c->timeout = prx->timeout.server;
527 if (tick_isset(prx->timeout.serverfin))
528 h2c->shut_timeout = prx->timeout.serverfin;
529 } else {
530 h2c->flags = H2_CF_NONE;
531 h2c->shut_timeout = h2c->timeout = prx->timeout.client;
532 if (tick_isset(prx->timeout.clientfin))
533 h2c->shut_timeout = prx->timeout.clientfin;
534 }
Willy Tarreau3f133572017-10-31 19:21:06 +0100535
Willy Tarreau0b37d652018-10-03 10:33:02 +0200536 h2c->proxy = prx;
Willy Tarreau33400292017-11-05 11:23:40 +0100537 h2c->task = NULL;
Willy Tarreau3f133572017-10-31 19:21:06 +0100538 if (tick_isset(h2c->timeout)) {
539 t = task_new(tid_bit);
540 if (!t)
541 goto fail;
542
543 h2c->task = t;
544 t->process = h2_timeout_task;
545 t->context = h2c;
546 t->expire = tick_add(now_ms, h2c->timeout);
547 }
Willy Tarreauea392822017-10-31 10:02:25 +0100548
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200549 h2c->wait_event.task = tasklet_new();
550 if (!h2c->wait_event.task)
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200551 goto fail;
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200552 h2c->wait_event.task->process = h2_io_cb;
553 h2c->wait_event.task->context = h2c;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100554 h2c->wait_event.events = 0;
Olivier Houchard910b2bc2018-07-17 18:49:38 +0200555
Willy Tarreau32218eb2017-09-22 08:07:25 +0200556 h2c->ddht = hpack_dht_alloc(h2_settings_header_table_size);
557 if (!h2c->ddht)
558 goto fail;
559
560 /* Initialise the context. */
561 h2c->st0 = H2_CS_PREFACE;
562 h2c->conn = conn;
Willy Tarreau2e2083a2019-01-31 10:34:07 +0100563 h2c->streams_limit = h2_settings_max_concurrent_streams;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200564 h2c->max_id = -1;
565 h2c->errcode = H2_ERR_NO_ERROR;
Willy Tarreau97aaa672018-12-23 09:49:04 +0100566 h2c->rcvd_c = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200567 h2c->rcvd_s = 0;
Willy Tarreau49745612017-12-03 18:56:02 +0100568 h2c->nb_streams = 0;
Willy Tarreau7ac60e82018-07-19 09:04:05 +0200569 h2c->nb_cs = 0;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100570 h2c->nb_reserved = 0;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100571 h2c->stream_cnt = 0;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200572
Christopher Faulet51f73eb2019-04-08 11:22:47 +0200573 h2c->dbuf = *input;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200574 h2c->dsi = -1;
575 h2c->msi = -1;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100576
Willy Tarreau32218eb2017-09-22 08:07:25 +0200577 h2c->last_sid = -1;
578
Willy Tarreau51330962019-05-26 09:38:07 +0200579 br_init(h2c->mbuf, sizeof(h2c->mbuf) / sizeof(h2c->mbuf[0]));
Willy Tarreau32218eb2017-09-22 08:07:25 +0200580 h2c->miw = 65535; /* mux initial window size */
581 h2c->mws = 65535; /* mux window size */
582 h2c->mfs = 16384; /* initial max frame size */
Willy Tarreau751f2d02018-10-05 09:35:00 +0200583 h2c->streams_by_id = EB_ROOT;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200584 LIST_INIT(&h2c->send_list);
585 LIST_INIT(&h2c->fctl_list);
Olivier Houchardd846c262018-10-19 17:24:29 +0200586 LIST_INIT(&h2c->sending_list);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100587 LIST_INIT(&h2c->buf_wait.list);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200588
Willy Tarreau3f133572017-10-31 19:21:06 +0100589 if (t)
590 task_queue(t);
Willy Tarreauea392822017-10-31 10:02:25 +0100591
Willy Tarreau01b44822018-10-03 14:26:37 +0200592 if (h2c->flags & H2_CF_IS_BACK) {
593 /* FIXME: this is temporary, for outgoing connections we need
594 * to immediately allocate a stream until the code is modified
595 * so that the caller calls ->attach(). For now the outgoing cs
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100596 * is stored as conn->ctx by the caller.
Willy Tarreau01b44822018-10-03 14:26:37 +0200597 */
598 struct h2s *h2s;
599
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100600 h2s = h2c_bck_stream_new(h2c, conn->ctx, sess);
Willy Tarreau01b44822018-10-03 14:26:37 +0200601 if (!h2s)
602 goto fail_stream;
603 }
604
Willy Tarreau3d2ee552018-12-19 14:12:10 +0100605 conn->ctx = h2c;
Willy Tarreau01b44822018-10-03 14:26:37 +0200606
Willy Tarreau0f383582018-10-03 14:22:21 +0200607 /* prepare to read something */
Olivier Houchard3ca18bf2019-04-05 15:34:34 +0200608 h2c_restart_reading(h2c, 1);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200609 return 0;
Willy Tarreau01b44822018-10-03 14:26:37 +0200610 fail_stream:
611 hpack_dht_free(h2c->ddht);
mildiscd2d7de2018-10-02 16:44:18 +0200612 fail:
Willy Tarreauf6562792019-05-07 19:05:35 +0200613 task_destroy(t);
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200614 if (h2c->wait_event.task)
615 tasklet_free(h2c->wait_event.task);
Willy Tarreaubafbe012017-11-24 17:34:44 +0100616 pool_free(pool_head_h2c, h2c);
mildiscd2d7de2018-10-02 16:44:18 +0200617 fail_no_h2c:
Willy Tarreau32218eb2017-09-22 08:07:25 +0200618 return -1;
619}
620
Willy Tarreau751f2d02018-10-05 09:35:00 +0200621/* returns the next allocatable outgoing stream ID for the H2 connection, or
622 * -1 if no more is allocatable.
623 */
624static inline int32_t h2c_get_next_sid(const struct h2c *h2c)
625{
626 int32_t id = (h2c->max_id + 1) | 1;
Willy Tarreaua80dca82019-01-24 17:08:28 +0100627
628 if ((id & 0x80000000U) || (h2c->last_sid >= 0 && id > h2c->last_sid))
Willy Tarreau751f2d02018-10-05 09:35:00 +0200629 id = -1;
630 return id;
631}
632
Willy Tarreau2373acc2017-10-12 17:35:14 +0200633/* returns the stream associated with id <id> or NULL if not found */
634static inline struct h2s *h2c_st_by_id(struct h2c *h2c, int id)
635{
636 struct eb32_node *node;
637
Willy Tarreau751f2d02018-10-05 09:35:00 +0200638 if (id == 0)
639 return (struct h2s *)h2_closed_stream;
640
Willy Tarreau2a856182017-05-16 15:20:39 +0200641 if (id > h2c->max_id)
642 return (struct h2s *)h2_idle_stream;
643
Willy Tarreau2373acc2017-10-12 17:35:14 +0200644 node = eb32_lookup(&h2c->streams_by_id, id);
645 if (!node)
Willy Tarreau2a856182017-05-16 15:20:39 +0200646 return (struct h2s *)h2_closed_stream;
Willy Tarreau2373acc2017-10-12 17:35:14 +0200647
648 return container_of(node, struct h2s, by_id);
649}
650
Christopher Faulet73c12072019-04-08 11:23:22 +0200651/* release function. This one should be called to free all resources allocated
652 * to the mux.
Willy Tarreau62f52692017-10-08 23:01:42 +0200653 */
Christopher Faulet73c12072019-04-08 11:23:22 +0200654static void h2_release(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +0200655{
Christopher Faulet61840e72019-04-15 09:33:32 +0200656 struct connection *conn = NULL;;
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200657
Willy Tarreau32218eb2017-09-22 08:07:25 +0200658 if (h2c) {
Christopher Faulet61840e72019-04-15 09:33:32 +0200659 /* The connection must be aattached to this mux to be released */
660 if (h2c->conn && h2c->conn->ctx == h2c)
661 conn = h2c->conn;
662
Willy Tarreau32218eb2017-09-22 08:07:25 +0200663 hpack_dht_free(h2c->ddht);
Willy Tarreau14398122017-09-22 14:26:04 +0200664
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100665 HA_SPIN_LOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100666 LIST_DEL(&h2c->buf_wait.list);
Christopher Faulet2a944ee2017-11-07 10:42:54 +0100667 HA_SPIN_UNLOCK(BUF_WQ_LOCK, &buffer_wq_lock);
Willy Tarreau14398122017-09-22 14:26:04 +0200668
Willy Tarreau44e973f2018-03-01 17:49:30 +0100669 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreau2e3c0002019-05-26 09:45:23 +0200670 h2_release_mbuf(h2c);
Willy Tarreau44e973f2018-03-01 17:49:30 +0100671
Willy Tarreauea392822017-10-31 10:02:25 +0100672 if (h2c->task) {
Willy Tarreau0975f112018-03-29 15:22:59 +0200673 h2c->task->context = NULL;
674 task_wakeup(h2c->task, TASK_WOKEN_OTHER);
Willy Tarreauea392822017-10-31 10:02:25 +0100675 h2c->task = NULL;
676 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200677 if (h2c->wait_event.task)
678 tasklet_free(h2c->wait_event.task);
Olivier Houchard0e079372019-04-15 17:51:16 +0200679 if (h2c->wait_event.events != 0)
Olivier Houcharde179d0e2019-03-21 18:27:17 +0100680 conn->xprt->unsubscribe(conn, conn->xprt_ctx, h2c->wait_event.events,
Olivier Houchard0e079372019-04-15 17:51:16 +0200681 &h2c->wait_event);
Willy Tarreauea392822017-10-31 10:02:25 +0100682
Willy Tarreaubafbe012017-11-24 17:34:44 +0100683 pool_free(pool_head_h2c, h2c);
Willy Tarreau32218eb2017-09-22 08:07:25 +0200684 }
685
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200686 if (conn) {
687 conn->mux = NULL;
688 conn->ctx = NULL;
Willy Tarreau32218eb2017-09-22 08:07:25 +0200689
Christopher Faulet39a96ee2019-04-08 10:52:21 +0200690 conn_stop_tracking(conn);
691 conn_full_close(conn);
692 if (conn->destroy_cb)
693 conn->destroy_cb(conn);
694 conn_free(conn);
695 }
Willy Tarreau62f52692017-10-08 23:01:42 +0200696}
697
698
Willy Tarreau71681172017-10-23 14:39:06 +0200699/******************************************************/
700/* functions below are for the H2 protocol processing */
701/******************************************************/
702
703/* returns the stream if of stream <h2s> or 0 if <h2s> is NULL */
Willy Tarreau1f094672017-11-20 21:27:45 +0100704static inline __maybe_unused int h2s_id(const struct h2s *h2s)
Willy Tarreau71681172017-10-23 14:39:06 +0200705{
706 return h2s ? h2s->id : 0;
707}
708
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200709/* returns true of the mux is currently busy as seen from stream <h2s> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100710static inline __maybe_unused int h2c_mux_busy(const struct h2c *h2c, const struct h2s *h2s)
Willy Tarreau5b5e6872017-09-25 16:17:25 +0200711{
712 if (h2c->msi < 0)
713 return 0;
714
715 if (h2c->msi == h2s_id(h2s))
716 return 0;
717
718 return 1;
719}
720
Willy Tarreau741d6df2017-10-17 08:00:59 +0200721/* marks an error on the connection */
Willy Tarreau1f094672017-11-20 21:27:45 +0100722static inline __maybe_unused void h2c_error(struct h2c *h2c, enum h2_err err)
Willy Tarreau741d6df2017-10-17 08:00:59 +0200723{
724 h2c->errcode = err;
725 h2c->st0 = H2_CS_ERROR;
726}
727
Willy Tarreau175cebb2019-01-24 10:02:24 +0100728/* marks an error on the stream. It may also update an already closed stream
729 * (e.g. to report an error after an RST was received).
730 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100731static inline __maybe_unused void h2s_error(struct h2s *h2s, enum h2_err err)
Willy Tarreau2e43f082017-10-17 08:03:59 +0200732{
Willy Tarreau175cebb2019-01-24 10:02:24 +0100733 if (h2s->id && h2s->st != H2_SS_ERROR) {
Willy Tarreau2e43f082017-10-17 08:03:59 +0200734 h2s->errcode = err;
Willy Tarreau175cebb2019-01-24 10:02:24 +0100735 if (h2s->st < H2_SS_ERROR)
736 h2s->st = H2_SS_ERROR;
Willy Tarreauec988c72018-12-19 18:00:29 +0100737 if (h2s->cs)
738 cs_set_error(h2s->cs);
Willy Tarreau2e43f082017-10-17 08:03:59 +0200739 }
740}
741
Willy Tarreau7e094452018-12-19 18:08:52 +0100742/* attempt to notify the data layer of recv availability */
743static void __maybe_unused h2s_notify_recv(struct h2s *h2s)
744{
745 struct wait_event *sw;
746
747 if (h2s->recv_wait) {
748 sw = h2s->recv_wait;
749 sw->events &= ~SUB_RETRY_RECV;
750 tasklet_wakeup(sw->task);
751 h2s->recv_wait = NULL;
752 }
753}
754
755/* attempt to notify the data layer of send availability */
756static void __maybe_unused h2s_notify_send(struct h2s *h2s)
757{
758 struct wait_event *sw;
759
Willy Tarreauc234ae32019-05-13 17:56:11 +0200760 if (h2s->send_wait && !LIST_ADDED(&h2s->sending_list)) {
Willy Tarreau7e094452018-12-19 18:08:52 +0100761 sw = h2s->send_wait;
762 sw->events &= ~SUB_RETRY_SEND;
Olivier Houchardfd1e96d2019-03-25 14:04:25 +0100763 LIST_ADDQ(&h2s->h2c->sending_list, &h2s->sending_list);
Willy Tarreau7e094452018-12-19 18:08:52 +0100764 tasklet_wakeup(sw->task);
Willy Tarreau7e094452018-12-19 18:08:52 +0100765 }
766}
767
Willy Tarreau8b2757c2018-12-19 17:36:48 +0100768/* alerts the data layer, trying to wake it up by all means, following
769 * this sequence :
770 * - if the h2s' data layer is subscribed to recv, then it's woken up for recv
771 * - if its subscribed to send, then it's woken up for send
772 * - if it was subscribed to neither, its ->wake() callback is called
773 * It is safe to call this function with a closed stream which doesn't have a
774 * conn_stream anymore.
775 */
776static void __maybe_unused h2s_alert(struct h2s *h2s)
777{
778 if (h2s->recv_wait || h2s->send_wait) {
779 h2s_notify_recv(h2s);
780 h2s_notify_send(h2s);
781 }
782 else if (h2s->cs && h2s->cs->data_cb->wake != NULL)
783 h2s->cs->data_cb->wake(h2s->cs);
784}
785
Willy Tarreaue4820742017-07-27 13:37:23 +0200786/* writes the 24-bit frame size <len> at address <frame> */
Willy Tarreau1f094672017-11-20 21:27:45 +0100787static inline __maybe_unused void h2_set_frame_size(void *frame, uint32_t len)
Willy Tarreaue4820742017-07-27 13:37:23 +0200788{
789 uint8_t *out = frame;
790
791 *out = len >> 16;
792 write_n16(out + 1, len);
793}
794
Willy Tarreau54c15062017-10-10 17:10:03 +0200795/* reads <bytes> bytes from buffer <b> starting at relative offset <o> from the
796 * current pointer, dealing with wrapping, and stores the result in <dst>. It's
797 * the caller's responsibility to verify that there are at least <bytes> bytes
Willy Tarreau9c7f2d12018-06-15 11:51:32 +0200798 * available in the buffer's input prior to calling this function. The buffer
799 * is assumed not to hold any output data.
Willy Tarreau54c15062017-10-10 17:10:03 +0200800 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100801static inline __maybe_unused void h2_get_buf_bytes(void *dst, size_t bytes,
Willy Tarreau54c15062017-10-10 17:10:03 +0200802 const struct buffer *b, int o)
803{
Willy Tarreau591d4452018-06-15 17:21:00 +0200804 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 +0200805}
806
Willy Tarreau1f094672017-11-20 21:27:45 +0100807static inline __maybe_unused uint16_t h2_get_n16(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200808{
Willy Tarreau591d4452018-06-15 17:21:00 +0200809 return readv_n16(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200810}
811
Willy Tarreau1f094672017-11-20 21:27:45 +0100812static inline __maybe_unused uint32_t h2_get_n32(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200813{
Willy Tarreau591d4452018-06-15 17:21:00 +0200814 return readv_n32(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200815}
816
Willy Tarreau1f094672017-11-20 21:27:45 +0100817static inline __maybe_unused uint64_t h2_get_n64(const struct buffer *b, int o)
Willy Tarreau54c15062017-10-10 17:10:03 +0200818{
Willy Tarreau591d4452018-06-15 17:21:00 +0200819 return readv_n64(b_peek(b, o), b_wrap(b) - b_peek(b, o), b_orig(b));
Willy Tarreau54c15062017-10-10 17:10:03 +0200820}
821
822
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100823/* Peeks an H2 frame header from offset <o> of buffer <b> into descriptor <h>.
824 * The algorithm is not obvious. It turns out that H2 headers are neither
825 * aligned nor do they use regular sizes. And to add to the trouble, the buffer
826 * may wrap so each byte read must be checked. The header is formed like this :
Willy Tarreau715d5312017-07-11 15:20:24 +0200827 *
828 * b0 b1 b2 b3 b4 b5..b8
829 * +----------+---------+--------+----+----+----------------------+
830 * |len[23:16]|len[15:8]|len[7:0]|type|flag|sid[31:0] (big endian)|
831 * +----------+---------+--------+----+----+----------------------+
832 *
833 * Here we read a big-endian 64 bit word from h[1]. This way in a single read
834 * we get the sid properly aligned and ordered, and 16 bits of len properly
835 * ordered as well. The type and flags can be extracted using bit shifts from
836 * the word, and only one extra read is needed to fetch len[16:23].
Willy Tarreau9c7f2d12018-06-15 11:51:32 +0200837 * Returns zero if some bytes are missing, otherwise non-zero on success. The
838 * buffer is assumed not to contain any output data.
Willy Tarreau715d5312017-07-11 15:20:24 +0200839 */
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100840static __maybe_unused int h2_peek_frame_hdr(const struct buffer *b, int o, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +0200841{
842 uint64_t w;
843
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100844 if (b_data(b) < o + 9)
Willy Tarreau715d5312017-07-11 15:20:24 +0200845 return 0;
846
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100847 w = h2_get_n64(b, o + 1);
848 h->len = *(uint8_t*)b_peek(b, o) << 16;
Willy Tarreau715d5312017-07-11 15:20:24 +0200849 h->sid = w & 0x7FFFFFFF; /* RFC7540#4.1: R bit must be ignored */
850 h->ff = w >> 32;
851 h->ft = w >> 40;
852 h->len += w >> 48;
853 return 1;
854}
855
856/* skip the next 9 bytes corresponding to the frame header possibly parsed by
857 * h2_peek_frame_hdr() above.
858 */
Willy Tarreau1f094672017-11-20 21:27:45 +0100859static inline __maybe_unused void h2_skip_frame_hdr(struct buffer *b)
Willy Tarreau715d5312017-07-11 15:20:24 +0200860{
Willy Tarreaue5f12ce2018-06-15 10:28:05 +0200861 b_del(b, 9);
Willy Tarreau715d5312017-07-11 15:20:24 +0200862}
863
864/* same as above, automatically advances the buffer on success */
Willy Tarreau1f094672017-11-20 21:27:45 +0100865static inline __maybe_unused int h2_get_frame_hdr(struct buffer *b, struct h2_fh *h)
Willy Tarreau715d5312017-07-11 15:20:24 +0200866{
867 int ret;
868
Willy Tarreaua4428bd2018-12-22 18:11:41 +0100869 ret = h2_peek_frame_hdr(b, 0, h);
Willy Tarreau715d5312017-07-11 15:20:24 +0200870 if (ret > 0)
871 h2_skip_frame_hdr(b);
872 return ret;
873}
874
Willy Tarreau00dd0782018-03-01 16:31:34 +0100875/* marks stream <h2s> as CLOSED and decrement the number of active streams for
876 * its connection if the stream was not yet closed. Please use this exclusively
877 * before closing a stream to ensure stream count is well maintained.
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100878 */
Willy Tarreau00dd0782018-03-01 16:31:34 +0100879static inline void h2s_close(struct h2s *h2s)
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100880{
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100881 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100882 h2s->h2c->nb_streams--;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100883 if (!h2s->id)
884 h2s->h2c->nb_reserved--;
Willy Tarreaua27db382019-03-25 18:13:16 +0100885 if (h2s->cs) {
Willy Tarreaua27db382019-03-25 18:13:16 +0100886 if (!(h2s->cs->flags & CS_FL_EOS) && !b_data(&h2s->rxbuf))
887 h2s_notify_recv(h2s);
888 }
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100889 }
Willy Tarreau91bfdd72017-12-14 12:00:14 +0100890 h2s->st = H2_SS_CLOSED;
891}
892
Willy Tarreau71049cc2018-03-28 13:56:39 +0200893/* detaches an H2 stream from its H2C and releases it to the H2S pool. */
894static void h2s_destroy(struct h2s *h2s)
Willy Tarreau0a10de62018-03-01 16:27:53 +0100895{
896 h2s_close(h2s);
897 eb32_delete(&h2s->by_id);
Olivier Houchard638b7992018-08-16 15:41:52 +0200898 if (b_size(&h2s->rxbuf)) {
899 b_free(&h2s->rxbuf);
900 offer_buffers(NULL, tasks_run_queue);
901 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200902 if (h2s->send_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100903 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200904 if (h2s->recv_wait != NULL)
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100905 h2s->recv_wait->events &= ~SUB_RETRY_RECV;
Joseph Herlantd77575d2018-11-25 10:54:45 -0800906 /* There's no need to explicitly call unsubscribe here, the only
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200907 * reference left would be in the h2c send_list/fctl_list, and if
908 * we're in it, we're getting out anyway
909 */
Olivier Houchardd360ac62019-03-22 17:37:16 +0100910 LIST_DEL_INIT(&h2s->list);
Willy Tarreauc234ae32019-05-13 17:56:11 +0200911 if (LIST_ADDED(&h2s->sending_list)) {
Olivier Houchard998410a2019-04-15 19:23:37 +0200912 task_remove_from_tasklet_list((struct task *)h2s->send_wait->task);
913 LIST_DEL_INIT(&h2s->sending_list);
914 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200915 tasklet_free(h2s->wait_event.task);
Willy Tarreau0a10de62018-03-01 16:27:53 +0100916 pool_free(pool_head_h2s, h2s);
917}
918
Willy Tarreaua8e49542018-10-03 18:53:55 +0200919/* allocates a new stream <id> for connection <h2c> and adds it into h2c's
920 * stream tree. In case of error, nothing is added and NULL is returned. The
921 * causes of errors can be any failed memory allocation. The caller is
922 * responsible for checking if the connection may support an extra stream
923 * prior to calling this function.
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200924 */
Willy Tarreaua8e49542018-10-03 18:53:55 +0200925static struct h2s *h2s_new(struct h2c *h2c, int id)
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200926{
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200927 struct h2s *h2s;
928
Willy Tarreaubafbe012017-11-24 17:34:44 +0100929 h2s = pool_alloc(pool_head_h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200930 if (!h2s)
931 goto out;
932
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200933 h2s->wait_event.task = tasklet_new();
934 if (!h2s->wait_event.task) {
935 pool_free(pool_head_h2s, h2s);
936 goto out;
937 }
938 h2s->send_wait = NULL;
939 h2s->recv_wait = NULL;
940 h2s->wait_event.task->process = h2_deferred_shut;
941 h2s->wait_event.task->context = h2s;
Willy Tarreau4f6516d2018-12-19 13:59:17 +0100942 h2s->wait_event.events = 0;
Olivier Houchardfa8aa862018-10-10 18:25:41 +0200943 LIST_INIT(&h2s->list);
Olivier Houchardd360ac62019-03-22 17:37:16 +0100944 LIST_INIT(&h2s->sending_list);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200945 h2s->h2c = h2c;
Willy Tarreaua8e49542018-10-03 18:53:55 +0200946 h2s->cs = NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200947 h2s->mws = h2c->miw;
948 h2s->flags = H2_SF_NONE;
949 h2s->errcode = H2_ERR_NO_ERROR;
950 h2s->st = H2_SS_IDLE;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +0200951 h2s->status = 0;
Willy Tarreau1915ca22019-01-24 11:49:37 +0100952 h2s->body_len = 0;
Olivier Houchard638b7992018-08-16 15:41:52 +0200953 h2s->rxbuf = BUF_NULL;
Willy Tarreau751f2d02018-10-05 09:35:00 +0200954
955 if (h2c->flags & H2_CF_IS_BACK) {
956 h1m_init_req(&h2s->h1m);
957 h2s->h1m.err_pos = -1; // don't care about errors on the request path
958 h2s->h1m.flags |= H1_MF_TOLOWER;
959 } else {
960 h1m_init_res(&h2s->h1m);
961 h2s->h1m.err_pos = -1; // don't care about errors on the response path
962 h2s->h1m.flags |= H1_MF_TOLOWER;
963 }
964
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200965 h2s->by_id.key = h2s->id = id;
Willy Tarreau751f2d02018-10-05 09:35:00 +0200966 if (id > 0)
967 h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +0100968 else
969 h2c->nb_reserved++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200970
971 eb32_insert(&h2c->streams_by_id, &h2s->by_id);
Willy Tarreau49745612017-12-03 18:56:02 +0100972 h2c->nb_streams++;
Willy Tarreaue9634bd2019-01-23 10:25:10 +0100973 h2c->stream_cnt++;
Willy Tarreaua8e49542018-10-03 18:53:55 +0200974
975 return h2s;
976
977 out_free_h2s:
978 pool_free(pool_head_h2s, h2s);
979 out:
980 return NULL;
981}
982
983/* creates a new stream <id> on the h2c connection and returns it, or NULL in
984 * case of memory allocation error.
985 */
986static struct h2s *h2c_frt_stream_new(struct h2c *h2c, int id)
987{
988 struct session *sess = h2c->conn->owner;
989 struct conn_stream *cs;
990 struct h2s *h2s;
991
992 if (h2c->nb_streams >= h2_settings_max_concurrent_streams)
993 goto out;
994
995 h2s = h2s_new(h2c, id);
996 if (!h2s)
997 goto out;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +0200998
999 cs = cs_new(h2c->conn);
1000 if (!cs)
1001 goto out_close;
1002
Olivier Houchard746fb772018-12-15 19:42:00 +01001003 cs->flags |= CS_FL_NOT_FIRST;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001004 h2s->cs = cs;
1005 cs->ctx = h2s;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001006 h2c->nb_cs++;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001007
1008 if (stream_create_from_cs(cs) < 0)
1009 goto out_free_cs;
1010
Willy Tarreau590a0512018-09-05 11:56:48 +02001011 /* We want the accept date presented to the next stream to be the one
1012 * we have now, the handshake time to be null (since the next stream
1013 * is not delayed by a handshake), and the idle time to count since
1014 * right now.
1015 */
1016 sess->accept_date = date;
1017 sess->tv_accept = now;
1018 sess->t_handshake = 0;
1019
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001020 /* OK done, the stream lives its own life now */
Willy Tarreaufa1d3572019-01-31 10:31:51 +01001021 if (h2_frt_has_too_many_cs(h2c))
Willy Tarreauf2101912018-07-19 10:11:38 +02001022 h2c->flags |= H2_CF_DEM_TOOMANY;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001023 return h2s;
1024
1025 out_free_cs:
Willy Tarreau7ac60e82018-07-19 09:04:05 +02001026 h2c->nb_cs--;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001027 cs_free(cs);
1028 out_close:
Willy Tarreau71049cc2018-03-28 13:56:39 +02001029 h2s_destroy(h2s);
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001030 out:
Willy Tarreau45efc072018-10-03 18:27:52 +02001031 sess_log(sess);
1032 return NULL;
Willy Tarreau3ccf4b22017-10-13 19:07:26 +02001033}
1034
Willy Tarreau751f2d02018-10-05 09:35:00 +02001035/* allocates a new stream associated to conn_stream <cs> on the h2c connection
1036 * and returns it, or NULL in case of memory allocation error or if the highest
1037 * possible stream ID was reached.
1038 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01001039static struct h2s *h2c_bck_stream_new(struct h2c *h2c, struct conn_stream *cs, struct session *sess)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001040{
1041 struct h2s *h2s = NULL;
1042
Willy Tarreau86949782019-01-31 10:42:05 +01001043 if (h2c->nb_streams >= h2c->streams_limit)
Willy Tarreau751f2d02018-10-05 09:35:00 +02001044 goto out;
1045
Willy Tarreaua80dca82019-01-24 17:08:28 +01001046 if (h2_streams_left(h2c) < 1)
1047 goto out;
1048
Willy Tarreau751f2d02018-10-05 09:35:00 +02001049 /* Defer choosing the ID until we send the first message to create the stream */
1050 h2s = h2s_new(h2c, 0);
1051 if (!h2s)
1052 goto out;
1053
1054 h2s->cs = cs;
Olivier Houchardf502aca2018-12-14 19:42:40 +01001055 h2s->sess = sess;
Willy Tarreau751f2d02018-10-05 09:35:00 +02001056 cs->ctx = h2s;
1057 h2c->nb_cs++;
1058
Willy Tarreau751f2d02018-10-05 09:35:00 +02001059 out:
1060 return h2s;
1061}
1062
Willy Tarreaube5b7152017-09-25 16:25:39 +02001063/* try to send a settings frame on the connection. Returns > 0 on success, 0 if
1064 * it couldn't do anything. It may return an error in h2c. See RFC7540#11.3 for
1065 * the various settings codes.
1066 */
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001067static int h2c_send_settings(struct h2c *h2c)
Willy Tarreaube5b7152017-09-25 16:25:39 +02001068{
1069 struct buffer *res;
1070 char buf_data[100]; // enough for 15 settings
Willy Tarreau83061a82018-07-13 11:56:34 +02001071 struct buffer buf;
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001072 int mfs;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001073 int ret;
1074
1075 if (h2c_mux_busy(h2c, NULL)) {
1076 h2c->flags |= H2_CF_DEM_MBUSY;
1077 return 0;
1078 }
1079
Willy Tarreaube5b7152017-09-25 16:25:39 +02001080 chunk_init(&buf, buf_data, sizeof(buf_data));
1081 chunk_memcpy(&buf,
1082 "\x00\x00\x00" /* length : 0 for now */
1083 "\x04\x00" /* type : 4 (settings), flags : 0 */
1084 "\x00\x00\x00\x00", /* stream ID : 0 */
1085 9);
1086
Willy Tarreau0bbad6b2019-02-26 16:01:52 +01001087 if (h2c->flags & H2_CF_IS_BACK) {
1088 /* send settings_enable_push=0 */
1089 chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
1090 }
1091
Willy Tarreaube5b7152017-09-25 16:25:39 +02001092 if (h2_settings_header_table_size != 4096) {
1093 char str[6] = "\x00\x01"; /* header_table_size */
1094
1095 write_n32(str + 2, h2_settings_header_table_size);
1096 chunk_memcat(&buf, str, 6);
1097 }
1098
1099 if (h2_settings_initial_window_size != 65535) {
1100 char str[6] = "\x00\x04"; /* initial_window_size */
1101
1102 write_n32(str + 2, h2_settings_initial_window_size);
1103 chunk_memcat(&buf, str, 6);
1104 }
1105
1106 if (h2_settings_max_concurrent_streams != 0) {
1107 char str[6] = "\x00\x03"; /* max_concurrent_streams */
1108
1109 /* Note: 0 means "unlimited" for haproxy's config but not for
1110 * the protocol, so never send this value!
1111 */
1112 write_n32(str + 2, h2_settings_max_concurrent_streams);
1113 chunk_memcat(&buf, str, 6);
1114 }
1115
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001116 mfs = h2_settings_max_frame_size;
1117 if (mfs > global.tune.bufsize)
1118 mfs = global.tune.bufsize;
1119
1120 if (!mfs)
1121 mfs = global.tune.bufsize;
1122
1123 if (mfs != 16384) {
Willy Tarreaube5b7152017-09-25 16:25:39 +02001124 char str[6] = "\x00\x05"; /* max_frame_size */
1125
1126 /* note: similarly we could also emit MAX_HEADER_LIST_SIZE to
1127 * match bufsize - rewrite size, but at the moment it seems
1128 * that clients don't take care of it.
1129 */
Willy Tarreaua24b35c2019-02-21 13:24:36 +01001130 write_n32(str + 2, mfs);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001131 chunk_memcat(&buf, str, 6);
1132 }
1133
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001134 h2_set_frame_size(buf.area, buf.data - 9);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001135
1136 res = br_tail(h2c->mbuf);
1137 retry:
1138 if (!h2_get_buf(h2c, res)) {
1139 h2c->flags |= H2_CF_MUX_MALLOC;
1140 h2c->flags |= H2_CF_DEM_MROOM;
1141 return 0;
1142 }
1143
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001144 ret = b_istput(res, ist2(buf.area, buf.data));
Willy Tarreaube5b7152017-09-25 16:25:39 +02001145 if (unlikely(ret <= 0)) {
1146 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001147 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1148 goto retry;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001149 h2c->flags |= H2_CF_MUX_MFULL;
1150 h2c->flags |= H2_CF_DEM_MROOM;
1151 return 0;
1152 }
1153 else {
1154 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1155 return 0;
1156 }
1157 }
1158 return ret;
1159}
1160
Willy Tarreau52eed752017-09-22 15:05:09 +02001161/* Try to receive a connection preface, then upon success try to send our
1162 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1163 * missing data. It may return an error in h2c.
1164 */
1165static int h2c_frt_recv_preface(struct h2c *h2c)
1166{
1167 int ret1;
Willy Tarreaube5b7152017-09-25 16:25:39 +02001168 int ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001169
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001170 ret1 = b_isteq(&h2c->dbuf, 0, b_data(&h2c->dbuf), ist(H2_CONN_PREFACE));
Willy Tarreau52eed752017-09-22 15:05:09 +02001171
1172 if (unlikely(ret1 <= 0)) {
Willy Tarreau22de8d32018-09-05 19:55:58 +02001173 if (ret1 < 0)
1174 sess_log(h2c->conn->owner);
1175
Willy Tarreau52eed752017-09-22 15:05:09 +02001176 if (ret1 < 0 || conn_xprt_read0_pending(h2c->conn))
1177 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
1178 return 0;
1179 }
1180
Willy Tarreau7f0cc492018-10-08 07:13:08 +02001181 ret2 = h2c_send_settings(h2c);
Willy Tarreaube5b7152017-09-25 16:25:39 +02001182 if (ret2 > 0)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001183 b_del(&h2c->dbuf, ret1);
Willy Tarreau52eed752017-09-22 15:05:09 +02001184
Willy Tarreaube5b7152017-09-25 16:25:39 +02001185 return ret2;
Willy Tarreau52eed752017-09-22 15:05:09 +02001186}
1187
Willy Tarreau01b44822018-10-03 14:26:37 +02001188/* Try to send a connection preface, then upon success try to send our
1189 * preface which is a SETTINGS frame. Returns > 0 on success or zero on
1190 * missing data. It may return an error in h2c.
1191 */
1192static int h2c_bck_send_preface(struct h2c *h2c)
1193{
1194 struct buffer *res;
Willy Tarreau9c218e72019-05-26 10:08:28 +02001195 int ret;
Willy Tarreau01b44822018-10-03 14:26:37 +02001196
1197 if (h2c_mux_busy(h2c, NULL)) {
1198 h2c->flags |= H2_CF_DEM_MBUSY;
1199 return 0;
1200 }
1201
Willy Tarreaubcc45952019-05-26 10:05:50 +02001202 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001203 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001204 if (!h2_get_buf(h2c, res)) {
Willy Tarreau01b44822018-10-03 14:26:37 +02001205 h2c->flags |= H2_CF_MUX_MALLOC;
1206 h2c->flags |= H2_CF_DEM_MROOM;
1207 return 0;
1208 }
1209
1210 if (!b_data(res)) {
1211 /* preface not yet sent */
Willy Tarreau9c218e72019-05-26 10:08:28 +02001212 ret = b_istput(res, ist(H2_CONN_PREFACE));
1213 if (unlikely(ret <= 0)) {
1214 if (!ret) {
1215 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1216 goto retry;
1217 h2c->flags |= H2_CF_MUX_MFULL;
1218 h2c->flags |= H2_CF_DEM_MROOM;
1219 return 0;
1220 }
1221 else {
1222 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1223 return 0;
1224 }
1225 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001226 }
Willy Tarreau01b44822018-10-03 14:26:37 +02001227 return h2c_send_settings(h2c);
1228}
1229
Willy Tarreau081d4722017-05-16 21:51:05 +02001230/* try to send a GOAWAY frame on the connection to report an error or a graceful
1231 * shutdown, with h2c->errcode as the error code. Returns > 0 on success or zero
1232 * if nothing was done. It uses h2c->last_sid as the advertised ID, or copies it
1233 * from h2c->max_id if it's not set yet (<0). In case of lack of room to write
1234 * the message, it subscribes the requester (either <h2s> or <h2c>) to future
1235 * notifications. It sets H2_CF_GOAWAY_SENT on success, and H2_CF_GOAWAY_FAILED
1236 * on unrecoverable failure. It will not attempt to send one again in this last
1237 * case so that it is safe to use h2c_error() to report such errors.
1238 */
1239static int h2c_send_goaway_error(struct h2c *h2c, struct h2s *h2s)
1240{
1241 struct buffer *res;
1242 char str[17];
1243 int ret;
1244
1245 if (h2c->flags & H2_CF_GOAWAY_FAILED)
1246 return 1; // claim that it worked
1247
1248 if (h2c_mux_busy(h2c, h2s)) {
1249 if (h2s)
1250 h2s->flags |= H2_SF_BLK_MBUSY;
1251 else
1252 h2c->flags |= H2_CF_DEM_MBUSY;
1253 return 0;
1254 }
1255
Willy Tarreau9c218e72019-05-26 10:08:28 +02001256 /* len: 8, type: 7, flags: none, sid: 0 */
1257 memcpy(str, "\x00\x00\x08\x07\x00\x00\x00\x00\x00", 9);
1258
1259 if (h2c->last_sid < 0)
1260 h2c->last_sid = h2c->max_id;
1261
1262 write_n32(str + 9, h2c->last_sid);
1263 write_n32(str + 13, h2c->errcode);
1264
Willy Tarreaubcc45952019-05-26 10:05:50 +02001265 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001266 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001267 if (!h2_get_buf(h2c, res)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02001268 h2c->flags |= H2_CF_MUX_MALLOC;
1269 if (h2s)
1270 h2s->flags |= H2_SF_BLK_MROOM;
1271 else
1272 h2c->flags |= H2_CF_DEM_MROOM;
1273 return 0;
1274 }
1275
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001276 ret = b_istput(res, ist2(str, 17));
Willy Tarreau081d4722017-05-16 21:51:05 +02001277 if (unlikely(ret <= 0)) {
1278 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001279 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1280 goto retry;
Willy Tarreau081d4722017-05-16 21:51:05 +02001281 h2c->flags |= H2_CF_MUX_MFULL;
1282 if (h2s)
1283 h2s->flags |= H2_SF_BLK_MROOM;
1284 else
1285 h2c->flags |= H2_CF_DEM_MROOM;
1286 return 0;
1287 }
1288 else {
1289 /* we cannot report this error using GOAWAY, so we mark
1290 * it and claim a success.
1291 */
1292 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1293 h2c->flags |= H2_CF_GOAWAY_FAILED;
1294 return 1;
1295 }
1296 }
1297 h2c->flags |= H2_CF_GOAWAY_SENT;
1298 return ret;
1299}
1300
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001301/* Try to send an RST_STREAM frame on the connection for the indicated stream
1302 * during mux operations. This stream must be valid and cannot be closed
1303 * already. h2s->id will be used for the stream ID and h2s->errcode will be
1304 * used for the error code. h2s->st will be update to H2_SS_CLOSED if it was
1305 * not yet.
1306 *
1307 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1308 * to write the message, it subscribes the stream to future notifications.
1309 */
1310static int h2s_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1311{
1312 struct buffer *res;
1313 char str[13];
1314 int ret;
1315
1316 if (!h2s || h2s->st == H2_SS_CLOSED)
1317 return 1;
1318
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001319 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1320 * RST_STREAM in response to a RST_STREAM frame.
1321 */
1322 if (h2c->dft == H2_FT_RST_STREAM) {
1323 ret = 1;
1324 goto ignore;
1325 }
1326
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001327 if (h2c_mux_busy(h2c, h2s)) {
1328 h2s->flags |= H2_SF_BLK_MBUSY;
1329 return 0;
1330 }
1331
Willy Tarreau9c218e72019-05-26 10:08:28 +02001332 /* len: 4, type: 3, flags: none */
1333 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1334 write_n32(str + 5, h2s->id);
1335 write_n32(str + 9, h2s->errcode);
1336
Willy Tarreaubcc45952019-05-26 10:05:50 +02001337 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001338 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001339 if (!h2_get_buf(h2c, res)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001340 h2c->flags |= H2_CF_MUX_MALLOC;
1341 h2s->flags |= H2_SF_BLK_MROOM;
1342 return 0;
1343 }
1344
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001345 ret = b_istput(res, ist2(str, 13));
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001346 if (unlikely(ret <= 0)) {
1347 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001348 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1349 goto retry;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001350 h2c->flags |= H2_CF_MUX_MFULL;
1351 h2s->flags |= H2_SF_BLK_MROOM;
1352 return 0;
1353 }
1354 else {
1355 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1356 return 0;
1357 }
1358 }
1359
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001360 ignore:
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001361 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001362 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001363 return ret;
1364}
1365
1366/* Try to send an RST_STREAM frame on the connection for the stream being
1367 * demuxed using h2c->dsi for the stream ID. It will use h2s->errcode as the
Willy Tarreaue6888ff2018-12-23 18:26:26 +01001368 * error code, even if the stream is one of the dummy ones, and will update
1369 * h2s->st to H2_SS_CLOSED if it was not yet.
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001370 *
1371 * Returns > 0 on success or zero if nothing was done. In case of lack of room
1372 * to write the message, it blocks the demuxer and subscribes it to future
Joseph Herlantd77575d2018-11-25 10:54:45 -08001373 * notifications. It's worth mentioning that an RST may even be sent for a
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001374 * closed stream.
Willy Tarreau27a84c92017-10-17 08:10:17 +02001375 */
1376static int h2c_send_rst_stream(struct h2c *h2c, struct h2s *h2s)
1377{
1378 struct buffer *res;
1379 char str[13];
1380 int ret;
1381
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001382 /* RFC7540#5.4.2: To avoid looping, an endpoint MUST NOT send a
1383 * RST_STREAM in response to a RST_STREAM frame.
1384 */
1385 if (h2c->dft == H2_FT_RST_STREAM) {
1386 ret = 1;
1387 goto ignore;
1388 }
1389
Willy Tarreau27a84c92017-10-17 08:10:17 +02001390 if (h2c_mux_busy(h2c, h2s)) {
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001391 h2c->flags |= H2_CF_DEM_MBUSY;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001392 return 0;
1393 }
1394
Willy Tarreau9c218e72019-05-26 10:08:28 +02001395 /* len: 4, type: 3, flags: none */
1396 memcpy(str, "\x00\x00\x04\x03\x00", 5);
1397
1398 write_n32(str + 5, h2c->dsi);
1399 write_n32(str + 9, h2s->errcode);
1400
Willy Tarreaubcc45952019-05-26 10:05:50 +02001401 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001402 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001403 if (!h2_get_buf(h2c, res)) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001404 h2c->flags |= H2_CF_MUX_MALLOC;
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001405 h2c->flags |= H2_CF_DEM_MROOM;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001406 return 0;
1407 }
1408
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001409 ret = b_istput(res, ist2(str, 13));
Willy Tarreau27a84c92017-10-17 08:10:17 +02001410 if (unlikely(ret <= 0)) {
1411 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001412 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1413 goto retry;
Willy Tarreau27a84c92017-10-17 08:10:17 +02001414 h2c->flags |= H2_CF_MUX_MFULL;
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 else {
1419 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1420 return 0;
1421 }
1422 }
1423
Willy Tarreau8adae7c2018-03-22 17:37:05 +01001424 ignore:
Willy Tarreauab0e1da2018-10-05 10:16:37 +02001425 if (h2s->id) {
Willy Tarreau27a84c92017-10-17 08:10:17 +02001426 h2s->flags |= H2_SF_RST_SENT;
Willy Tarreau00dd0782018-03-01 16:31:34 +01001427 h2s_close(h2s);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01001428 }
1429
Willy Tarreau27a84c92017-10-17 08:10:17 +02001430 return ret;
1431}
1432
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001433/* try to send an empty DATA frame with the ES flag set to notify about the
1434 * end of stream and match a shutdown(write). If an ES was already sent as
1435 * indicated by HLOC/ERROR/RESET/CLOSED states, nothing is done. Returns > 0
1436 * on success or zero if nothing was done. In case of lack of room to write the
1437 * message, it subscribes the requesting stream to future notifications.
1438 */
1439static int h2_send_empty_data_es(struct h2s *h2s)
1440{
1441 struct h2c *h2c = h2s->h2c;
1442 struct buffer *res;
1443 char str[9];
1444 int ret;
1445
Willy Tarreau721c9742017-11-07 11:05:42 +01001446 if (h2s->st == H2_SS_HLOC || h2s->st == H2_SS_ERROR || h2s->st == H2_SS_CLOSED)
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001447 return 1;
1448
1449 if (h2c_mux_busy(h2c, h2s)) {
1450 h2s->flags |= H2_SF_BLK_MBUSY;
1451 return 0;
1452 }
1453
Willy Tarreau9c218e72019-05-26 10:08:28 +02001454 /* len: 0x000000, type: 0(DATA), flags: ES=1 */
1455 memcpy(str, "\x00\x00\x00\x00\x01", 5);
1456 write_n32(str + 5, h2s->id);
1457
Willy Tarreaubcc45952019-05-26 10:05:50 +02001458 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001459 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001460 if (!h2_get_buf(h2c, res)) {
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001461 h2c->flags |= H2_CF_MUX_MALLOC;
1462 h2s->flags |= H2_SF_BLK_MROOM;
1463 return 0;
1464 }
1465
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001466 ret = b_istput(res, ist2(str, 9));
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001467 if (likely(ret > 0)) {
1468 h2s->flags |= H2_SF_ES_SENT;
1469 }
1470 else if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001471 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1472 goto retry;
Willy Tarreau6d8b6822017-11-07 14:39:09 +01001473 h2c->flags |= H2_CF_MUX_MFULL;
1474 h2s->flags |= H2_SF_BLK_MROOM;
1475 return 0;
1476 }
1477 else {
1478 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1479 return 0;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01001480 }
1481 return ret;
1482}
1483
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001484/* wake a specific stream and assign its conn_stream som CS_FL_* flags among
Willy Tarreau99ad1b32019-05-14 11:46:28 +02001485 * CS_FL_ERR_PENDING and CS_FL_ERROR if needed. The stream's state
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001486 * is automatically updated accordingly. If the stream is orphaned, it is
1487 * destroyed.
Christopher Fauletf02ca002019-03-07 16:21:34 +01001488 */
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001489static void h2s_wake_one_stream(struct h2s *h2s)
Christopher Fauletf02ca002019-03-07 16:21:34 +01001490{
1491 if (!h2s->cs) {
1492 /* this stream was already orphaned */
1493 h2s_destroy(h2s);
1494 return;
1495 }
1496
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001497 if (conn_xprt_read0_pending(h2s->h2c->conn)) {
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001498 if (h2s->st == H2_SS_OPEN)
1499 h2s->st = H2_SS_HREM;
1500 else if (h2s->st == H2_SS_HLOC)
1501 h2s_close(h2s);
1502 }
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001503
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001504 if ((h2s->h2c->st0 >= H2_CS_ERROR || h2s->h2c->conn->flags & CO_FL_ERROR) ||
1505 (h2s->h2c->last_sid > 0 && (!h2s->id || h2s->id > h2s->h2c->last_sid))) {
1506 h2s->cs->flags |= CS_FL_ERR_PENDING;
1507 if (h2s->cs->flags & CS_FL_EOS)
1508 h2s->cs->flags |= CS_FL_ERROR;
Willy Tarreau23482912019-05-07 15:23:14 +02001509
Willy Tarreauaebbe5e2019-05-07 17:48:59 +02001510 if (h2s->st < H2_SS_ERROR)
1511 h2s->st = H2_SS_ERROR;
1512 }
Christopher Fauletf02ca002019-03-07 16:21:34 +01001513
1514 h2s_alert(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001515}
1516
1517/* wake the streams attached to the connection, whose id is greater than <last>
1518 * or unassigned.
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001519 */
Willy Tarreau23482912019-05-07 15:23:14 +02001520static void h2_wake_some_streams(struct h2c *h2c, int last)
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001521{
1522 struct eb32_node *node;
1523 struct h2s *h2s;
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001524
Christopher Fauletf02ca002019-03-07 16:21:34 +01001525 /* Wake all streams with ID > last */
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001526 node = eb32_lookup_ge(&h2c->streams_by_id, last + 1);
1527 while (node) {
1528 h2s = container_of(node, struct h2s, by_id);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001529 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001530 h2s_wake_one_stream(h2s);
Christopher Fauletf02ca002019-03-07 16:21:34 +01001531 }
Willy Tarreau22cf59b2017-11-10 11:42:33 +01001532
Christopher Fauletf02ca002019-03-07 16:21:34 +01001533 /* Wake all streams with unassigned ID (ID == 0) */
1534 node = eb32_lookup(&h2c->streams_by_id, 0);
1535 while (node) {
1536 h2s = container_of(node, struct h2s, by_id);
1537 if (h2s->id > 0)
1538 break;
1539 node = eb32_next(node);
Willy Tarreau13b6c2e2019-05-07 17:26:05 +02001540 h2s_wake_one_stream(h2s);
Willy Tarreau23b92aa2017-10-30 00:26:54 +01001541 }
1542}
1543
Willy Tarreau3421aba2017-07-27 15:41:03 +02001544/* Increase all streams' outgoing window size by the difference passed in
1545 * argument. This is needed upon receipt of the settings frame if the initial
1546 * window size is different. The difference may be negative and the resulting
1547 * window size as well, for the time it takes to receive some window updates.
1548 */
1549static void h2c_update_all_ws(struct h2c *h2c, int diff)
1550{
1551 struct h2s *h2s;
1552 struct eb32_node *node;
1553
1554 if (!diff)
1555 return;
1556
1557 node = eb32_first(&h2c->streams_by_id);
1558 while (node) {
1559 h2s = container_of(node, struct h2s, by_id);
1560 h2s->mws += diff;
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001561
1562 if (h2s->mws > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
1563 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02001564 if (h2s->send_wait && !LIST_ADDED(&h2s->list))
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001565 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreaub1c9edc2019-01-30 16:11:20 +01001566 }
1567
Willy Tarreau3421aba2017-07-27 15:41:03 +02001568 node = eb32_next(node);
1569 }
1570}
1571
1572/* processes a SETTINGS frame whose payload is <payload> for <plen> bytes, and
1573 * ACKs it if needed. Returns > 0 on success or zero on missing data. It may
Willy Tarreaub860c732019-01-30 15:39:55 +01001574 * return an error in h2c. The caller must have already verified frame length
1575 * and stream ID validity. Described in RFC7540#6.5.
Willy Tarreau3421aba2017-07-27 15:41:03 +02001576 */
1577static int h2c_handle_settings(struct h2c *h2c)
1578{
1579 unsigned int offset;
1580 int error;
1581
1582 if (h2c->dff & H2_F_SETTINGS_ACK) {
1583 if (h2c->dfl) {
1584 error = H2_ERR_FRAME_SIZE_ERROR;
1585 goto fail;
1586 }
1587 return 1;
1588 }
1589
Willy Tarreau3421aba2017-07-27 15:41:03 +02001590 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001591 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau3421aba2017-07-27 15:41:03 +02001592 return 0;
1593
1594 /* parse the frame */
1595 for (offset = 0; offset < h2c->dfl; offset += 6) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001596 uint16_t type = h2_get_n16(&h2c->dbuf, offset);
1597 int32_t arg = h2_get_n32(&h2c->dbuf, offset + 2);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001598
1599 switch (type) {
1600 case H2_SETTINGS_INITIAL_WINDOW_SIZE:
1601 /* we need to update all existing streams with the
1602 * difference from the previous iws.
1603 */
1604 if (arg < 0) { // RFC7540#6.5.2
1605 error = H2_ERR_FLOW_CONTROL_ERROR;
1606 goto fail;
1607 }
1608 h2c_update_all_ws(h2c, arg - h2c->miw);
1609 h2c->miw = arg;
1610 break;
1611 case H2_SETTINGS_MAX_FRAME_SIZE:
1612 if (arg < 16384 || arg > 16777215) { // RFC7540#6.5.2
1613 error = H2_ERR_PROTOCOL_ERROR;
1614 goto fail;
1615 }
1616 h2c->mfs = arg;
1617 break;
Willy Tarreau1b38b462017-12-03 19:02:28 +01001618 case H2_SETTINGS_ENABLE_PUSH:
1619 if (arg < 0 || arg > 1) { // RFC7540#6.5.2
1620 error = H2_ERR_PROTOCOL_ERROR;
1621 goto fail;
1622 }
1623 break;
Willy Tarreau2e2083a2019-01-31 10:34:07 +01001624 case H2_SETTINGS_MAX_CONCURRENT_STREAMS:
1625 if (h2c->flags & H2_CF_IS_BACK) {
1626 /* the limit is only for the backend; for the frontend it is our limit */
1627 if ((unsigned int)arg > h2_settings_max_concurrent_streams)
1628 arg = h2_settings_max_concurrent_streams;
1629 h2c->streams_limit = arg;
1630 }
1631 break;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001632 }
1633 }
1634
1635 /* need to ACK this frame now */
1636 h2c->st0 = H2_CS_FRAME_A;
1637 return 1;
1638 fail:
Willy Tarreau22de8d32018-09-05 19:55:58 +02001639 sess_log(h2c->conn->owner);
Willy Tarreau3421aba2017-07-27 15:41:03 +02001640 h2c_error(h2c, error);
1641 return 0;
1642}
1643
1644/* try to send an ACK for a settings frame on the connection. Returns > 0 on
1645 * success or one of the h2_status values.
1646 */
1647static int h2c_ack_settings(struct h2c *h2c)
1648{
1649 struct buffer *res;
1650 char str[9];
1651 int ret = -1;
1652
1653 if (h2c_mux_busy(h2c, NULL)) {
1654 h2c->flags |= H2_CF_DEM_MBUSY;
1655 return 0;
1656 }
1657
Willy Tarreau9c218e72019-05-26 10:08:28 +02001658 memcpy(str,
1659 "\x00\x00\x00" /* length : 0 (no data) */
1660 "\x04" "\x01" /* type : 4, flags : ACK */
1661 "\x00\x00\x00\x00" /* stream ID */, 9);
1662
Willy Tarreaubcc45952019-05-26 10:05:50 +02001663 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001664 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001665 if (!h2_get_buf(h2c, res)) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02001666 h2c->flags |= H2_CF_MUX_MALLOC;
1667 h2c->flags |= H2_CF_DEM_MROOM;
1668 return 0;
1669 }
1670
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001671 ret = b_istput(res, ist2(str, 9));
Willy Tarreau3421aba2017-07-27 15:41:03 +02001672 if (unlikely(ret <= 0)) {
1673 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001674 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1675 goto retry;
Willy Tarreau3421aba2017-07-27 15:41:03 +02001676 h2c->flags |= H2_CF_MUX_MFULL;
1677 h2c->flags |= H2_CF_DEM_MROOM;
1678 return 0;
1679 }
1680 else {
1681 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1682 return 0;
1683 }
1684 }
1685 return ret;
1686}
1687
Willy Tarreaucf68c782017-10-10 17:11:41 +02001688/* processes a PING frame and schedules an ACK if needed. The caller must pass
1689 * the pointer to the payload in <payload>. Returns > 0 on success or zero on
Willy Tarreaub860c732019-01-30 15:39:55 +01001690 * missing data. The caller must have already verified frame length
1691 * and stream ID validity.
Willy Tarreaucf68c782017-10-10 17:11:41 +02001692 */
1693static int h2c_handle_ping(struct h2c *h2c)
1694{
Willy Tarreaucf68c782017-10-10 17:11:41 +02001695 /* schedule a response */
Willy Tarreau68ed6412017-12-03 18:15:56 +01001696 if (!(h2c->dff & H2_F_PING_ACK))
Willy Tarreaucf68c782017-10-10 17:11:41 +02001697 h2c->st0 = H2_CS_FRAME_A;
1698 return 1;
1699}
1700
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001701/* Try to send a window update for stream id <sid> and value <increment>.
1702 * Returns > 0 on success or zero on missing room or failure. It may return an
1703 * error in h2c.
1704 */
1705static int h2c_send_window_update(struct h2c *h2c, int sid, uint32_t increment)
1706{
1707 struct buffer *res;
1708 char str[13];
1709 int ret = -1;
1710
1711 if (h2c_mux_busy(h2c, NULL)) {
1712 h2c->flags |= H2_CF_DEM_MBUSY;
1713 return 0;
1714 }
1715
Willy Tarreau9c218e72019-05-26 10:08:28 +02001716 /* length: 4, type: 8, flags: none */
1717 memcpy(str, "\x00\x00\x04\x08\x00", 5);
1718 write_n32(str + 5, sid);
1719 write_n32(str + 9, increment);
1720
Willy Tarreaubcc45952019-05-26 10:05:50 +02001721 res = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02001722 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02001723 if (!h2_get_buf(h2c, res)) {
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001724 h2c->flags |= H2_CF_MUX_MALLOC;
1725 h2c->flags |= H2_CF_DEM_MROOM;
1726 return 0;
1727 }
1728
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001729 ret = b_istput(res, ist2(str, 13));
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001730 if (unlikely(ret <= 0)) {
1731 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001732 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1733 goto retry;
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001734 h2c->flags |= H2_CF_MUX_MFULL;
1735 h2c->flags |= H2_CF_DEM_MROOM;
1736 return 0;
1737 }
1738 else {
1739 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1740 return 0;
1741 }
1742 }
1743 return ret;
1744}
1745
1746/* try to send pending window update for the connection. It's safe to call it
1747 * with no pending updates. Returns > 0 on success or zero on missing room or
1748 * failure. It may return an error in h2c.
1749 */
1750static int h2c_send_conn_wu(struct h2c *h2c)
1751{
1752 int ret = 1;
1753
1754 if (h2c->rcvd_c <= 0)
1755 return 1;
1756
Willy Tarreau97aaa672018-12-23 09:49:04 +01001757 if (!(h2c->flags & H2_CF_WINDOW_OPENED)) {
1758 /* increase the advertised connection window to 2G on
1759 * first update.
1760 */
1761 h2c->flags |= H2_CF_WINDOW_OPENED;
1762 h2c->rcvd_c += H2_INITIAL_WINDOW_INCREMENT;
1763 }
1764
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02001765 /* send WU for the connection */
1766 ret = h2c_send_window_update(h2c, 0, h2c->rcvd_c);
1767 if (ret > 0)
1768 h2c->rcvd_c = 0;
1769
1770 return ret;
1771}
1772
1773/* try to send pending window update for the current dmux stream. It's safe to
1774 * call it with no pending updates. Returns > 0 on success or zero on missing
1775 * room or failure. It may return an error in h2c.
1776 */
1777static int h2c_send_strm_wu(struct h2c *h2c)
1778{
1779 int ret = 1;
1780
1781 if (h2c->rcvd_s <= 0)
1782 return 1;
1783
1784 /* send WU for the stream */
1785 ret = h2c_send_window_update(h2c, h2c->dsi, h2c->rcvd_s);
1786 if (ret > 0)
1787 h2c->rcvd_s = 0;
1788
1789 return ret;
1790}
1791
Willy Tarreaucf68c782017-10-10 17:11:41 +02001792/* try to send an ACK for a ping frame on the connection. Returns > 0 on
1793 * success, 0 on missing data or one of the h2_status values.
1794 */
1795static int h2c_ack_ping(struct h2c *h2c)
1796{
1797 struct buffer *res;
1798 char str[17];
1799 int ret = -1;
1800
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001801 if (b_data(&h2c->dbuf) < 8)
Willy Tarreaucf68c782017-10-10 17:11:41 +02001802 return 0;
1803
1804 if (h2c_mux_busy(h2c, NULL)) {
1805 h2c->flags |= H2_CF_DEM_MBUSY;
1806 return 0;
1807 }
1808
Willy Tarreaucf68c782017-10-10 17:11:41 +02001809 memcpy(str,
1810 "\x00\x00\x08" /* length : 8 (same payload) */
1811 "\x06" "\x01" /* type : 6, flags : ACK */
1812 "\x00\x00\x00\x00" /* stream ID */, 9);
1813
1814 /* copy the original payload */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001815 h2_get_buf_bytes(str + 9, 8, &h2c->dbuf, 0);
Willy Tarreaucf68c782017-10-10 17:11:41 +02001816
Willy Tarreau9c218e72019-05-26 10:08:28 +02001817 res = br_tail(h2c->mbuf);
1818 retry:
1819 if (!h2_get_buf(h2c, res)) {
1820 h2c->flags |= H2_CF_MUX_MALLOC;
1821 h2c->flags |= H2_CF_DEM_MROOM;
1822 return 0;
1823 }
1824
Willy Tarreauea1b06d2018-07-12 09:02:47 +02001825 ret = b_istput(res, ist2(str, 17));
Willy Tarreaucf68c782017-10-10 17:11:41 +02001826 if (unlikely(ret <= 0)) {
1827 if (!ret) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02001828 if ((res = br_tail_add(h2c->mbuf)) != NULL)
1829 goto retry;
Willy Tarreaucf68c782017-10-10 17:11:41 +02001830 h2c->flags |= H2_CF_MUX_MFULL;
1831 h2c->flags |= H2_CF_DEM_MROOM;
1832 return 0;
1833 }
1834 else {
1835 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
1836 return 0;
1837 }
1838 }
1839 return ret;
1840}
1841
Willy Tarreau26f95952017-07-27 17:18:30 +02001842/* processes a WINDOW_UPDATE frame whose payload is <payload> for <plen> bytes.
1843 * Returns > 0 on success or zero on missing data. It may return an error in
Willy Tarreaub860c732019-01-30 15:39:55 +01001844 * h2c or h2s. The caller must have already verified frame length and stream ID
1845 * validity. Described in RFC7540#6.9.
Willy Tarreau26f95952017-07-27 17:18:30 +02001846 */
1847static int h2c_handle_window_update(struct h2c *h2c, struct h2s *h2s)
1848{
1849 int32_t inc;
1850 int error;
1851
Willy Tarreau26f95952017-07-27 17:18:30 +02001852 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001853 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau26f95952017-07-27 17:18:30 +02001854 return 0;
1855
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001856 inc = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau26f95952017-07-27 17:18:30 +02001857
1858 if (h2c->dsi != 0) {
1859 /* stream window update */
Willy Tarreau26f95952017-07-27 17:18:30 +02001860
1861 /* it's not an error to receive WU on a closed stream */
1862 if (h2s->st == H2_SS_CLOSED)
1863 return 1;
1864
1865 if (!inc) {
1866 error = H2_ERR_PROTOCOL_ERROR;
1867 goto strm_err;
1868 }
1869
1870 if (h2s->mws >= 0 && h2s->mws + inc < 0) {
1871 error = H2_ERR_FLOW_CONTROL_ERROR;
1872 goto strm_err;
1873 }
1874
1875 h2s->mws += inc;
1876 if (h2s->mws > 0 && (h2s->flags & H2_SF_BLK_SFCTL)) {
1877 h2s->flags &= ~H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02001878 if (h2s->send_wait && !LIST_ADDED(&h2s->list))
Olivier Houcharddddfe312018-10-10 18:51:00 +02001879 LIST_ADDQ(&h2c->send_list, &h2s->list);
Willy Tarreau26f95952017-07-27 17:18:30 +02001880 }
1881 }
1882 else {
1883 /* connection window update */
1884 if (!inc) {
1885 error = H2_ERR_PROTOCOL_ERROR;
1886 goto conn_err;
1887 }
1888
1889 if (h2c->mws >= 0 && h2c->mws + inc < 0) {
1890 error = H2_ERR_FLOW_CONTROL_ERROR;
1891 goto conn_err;
1892 }
1893
1894 h2c->mws += inc;
1895 }
1896
1897 return 1;
1898
1899 conn_err:
1900 h2c_error(h2c, error);
1901 return 0;
1902
1903 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01001904 h2s_error(h2s, error);
1905 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau26f95952017-07-27 17:18:30 +02001906 return 0;
1907}
1908
Willy Tarreaue96b0922017-10-30 00:28:29 +01001909/* processes a GOAWAY frame, and signals all streams whose ID is greater than
Willy Tarreaub860c732019-01-30 15:39:55 +01001910 * the last ID. Returns > 0 on success or zero on missing data. The caller must
1911 * have already verified frame length and stream ID validity. Described in
1912 * RFC7540#6.8.
Willy Tarreaue96b0922017-10-30 00:28:29 +01001913 */
1914static int h2c_handle_goaway(struct h2c *h2c)
1915{
Willy Tarreaue96b0922017-10-30 00:28:29 +01001916 int last;
1917
Willy Tarreaue96b0922017-10-30 00:28:29 +01001918 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001919 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreaue96b0922017-10-30 00:28:29 +01001920 return 0;
1921
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001922 last = h2_get_n32(&h2c->dbuf, 0);
1923 h2c->errcode = h2_get_n32(&h2c->dbuf, 4);
Willy Tarreau11cc2d62017-12-03 10:27:47 +01001924 if (h2c->last_sid < 0)
1925 h2c->last_sid = last;
Willy Tarreau23482912019-05-07 15:23:14 +02001926 h2_wake_some_streams(h2c, last);
Willy Tarreaue96b0922017-10-30 00:28:29 +01001927 return 1;
Willy Tarreaue96b0922017-10-30 00:28:29 +01001928}
1929
Willy Tarreau92153fc2017-12-03 19:46:19 +01001930/* processes a PRIORITY frame, and either skips it or rejects if it is
Willy Tarreaub860c732019-01-30 15:39:55 +01001931 * invalid. Returns > 0 on success or zero on missing data. It may return an
1932 * error in h2c. The caller must have already verified frame length and stream
1933 * ID validity. Described in RFC7540#6.3.
Willy Tarreau92153fc2017-12-03 19:46:19 +01001934 */
1935static int h2c_handle_priority(struct h2c *h2c)
1936{
Willy Tarreau92153fc2017-12-03 19:46:19 +01001937 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001938 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreau92153fc2017-12-03 19:46:19 +01001939 return 0;
1940
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001941 if (h2_get_n32(&h2c->dbuf, 0) == h2c->dsi) {
Willy Tarreau92153fc2017-12-03 19:46:19 +01001942 /* 7540#5.3 : can't depend on itself */
Willy Tarreaub860c732019-01-30 15:39:55 +01001943 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
1944 return 0;
Willy Tarreau92153fc2017-12-03 19:46:19 +01001945 }
1946 return 1;
Willy Tarreau92153fc2017-12-03 19:46:19 +01001947}
1948
Willy Tarreaucd234e92017-08-18 10:59:39 +02001949/* processes an RST_STREAM frame, and sets the 32-bit error code on the stream.
Willy Tarreaub860c732019-01-30 15:39:55 +01001950 * Returns > 0 on success or zero on missing data. The caller must have already
1951 * verified frame length and stream ID validity. Described in RFC7540#6.4.
Willy Tarreaucd234e92017-08-18 10:59:39 +02001952 */
1953static int h2c_handle_rst_stream(struct h2c *h2c, struct h2s *h2s)
1954{
Willy Tarreaucd234e92017-08-18 10:59:39 +02001955 /* process full frame only */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001956 if (b_data(&h2c->dbuf) < h2c->dfl)
Willy Tarreaucd234e92017-08-18 10:59:39 +02001957 return 0;
1958
1959 /* late RST, already handled */
1960 if (h2s->st == H2_SS_CLOSED)
1961 return 1;
1962
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001963 h2s->errcode = h2_get_n32(&h2c->dbuf, 0);
Willy Tarreau00dd0782018-03-01 16:31:34 +01001964 h2s_close(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02001965
1966 if (h2s->cs) {
Willy Tarreauec988c72018-12-19 18:00:29 +01001967 cs_set_error(h2s->cs);
Willy Tarreauf830f012018-12-19 17:44:55 +01001968 h2s_alert(h2s);
Willy Tarreaucd234e92017-08-18 10:59:39 +02001969 }
1970
1971 h2s->flags |= H2_SF_RST_RCVD;
1972 return 1;
Willy Tarreaucd234e92017-08-18 10:59:39 +02001973}
1974
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001975/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
1976 * It may return an error in h2c or h2s. The caller must consider that the
1977 * return value is the new h2s in case one was allocated (most common case).
1978 * Described in RFC7540#6.2. Most of the
Willy Tarreau13278b42017-10-13 19:23:14 +02001979 * errors here are reported as connection errors since it's impossible to
1980 * recover from such errors after the compression context has been altered.
1981 */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001982static struct h2s *h2c_frt_handle_headers(struct h2c *h2c, struct h2s *h2s)
Willy Tarreau13278b42017-10-13 19:23:14 +02001983{
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01001984 struct buffer rxbuf = BUF_NULL;
Willy Tarreau4790f7c2019-01-24 11:33:02 +01001985 unsigned long long body_len = 0;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01001986 uint32_t flags = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02001987 int error;
1988
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001989 if (!b_size(&h2c->dbuf))
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001990 return NULL; // empty buffer
Willy Tarreau13278b42017-10-13 19:23:14 +02001991
Willy Tarreauc9fa0482018-07-10 17:43:27 +02001992 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau2a761dc2018-02-26 18:50:57 +01001993 return NULL; // incomplete frame
Willy Tarreau13278b42017-10-13 19:23:14 +02001994
1995 /* now either the frame is complete or the buffer is complete */
1996 if (h2s->st != H2_SS_IDLE) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01001997 /* The stream exists/existed, this must be a trailers frame */
1998 if (h2s->st != H2_SS_CLOSED) {
Willy Tarreauaab1a602019-05-06 11:12:18 +02001999 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &body_len);
2000 /* unrecoverable error ? */
2001 if (h2c->st0 >= H2_CS_ERROR)
2002 goto out;
2003
2004 if (error == 0)
2005 goto out; // missing data
2006
2007 if (error < 0) {
2008 /* Failed to decode this frame (e.g. too large request)
2009 * but the HPACK decompressor is still synchronized.
2010 */
2011 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
2012 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau88d138e2019-01-02 19:38:14 +01002013 goto out;
Willy Tarreauaab1a602019-05-06 11:12:18 +02002014 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01002015 goto done;
2016 }
Willy Tarreau1f035502019-01-30 11:44:07 +01002017 /* the connection was already killed by an RST, let's consume
2018 * the data and send another RST.
2019 */
2020 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
2021 h2s = (struct h2s*)h2_error_stream;
2022 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002023 }
2024 else if (h2c->dsi <= h2c->max_id || !(h2c->dsi & 1)) {
2025 /* RFC7540#5.1.1 stream id > prev ones, and must be odd here */
2026 error = H2_ERR_PROTOCOL_ERROR;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002027 sess_log(h2c->conn->owner);
Willy Tarreau13278b42017-10-13 19:23:14 +02002028 goto conn_err;
2029 }
Willy Tarreau415b1ee2019-01-02 13:59:43 +01002030 else if (h2c->flags & H2_CF_DEM_TOOMANY)
2031 goto out; // IDLE but too many cs still present
Willy Tarreau13278b42017-10-13 19:23:14 +02002032
Willy Tarreau4790f7c2019-01-24 11:33:02 +01002033 error = h2c_decode_headers(h2c, &rxbuf, &flags, &body_len);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002034
Willy Tarreau25919232019-01-03 14:48:18 +01002035 /* unrecoverable error ? */
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002036 if (h2c->st0 >= H2_CS_ERROR)
2037 goto out;
2038
Willy Tarreau25919232019-01-03 14:48:18 +01002039 if (error <= 0) {
2040 if (error == 0)
2041 goto out; // missing data
2042
2043 /* Failed to decode this stream (e.g. too large request)
2044 * but the HPACK decompressor is still synchronized.
2045 */
2046 h2s = (struct h2s*)h2_error_stream;
2047 goto send_rst;
2048 }
2049
Willy Tarreau22de8d32018-09-05 19:55:58 +02002050 /* Note: we don't emit any other logs below because ff we return
Willy Tarreaua8e49542018-10-03 18:53:55 +02002051 * positively from h2c_frt_stream_new(), the stream will report the error,
2052 * and if we return in error, h2c_frt_stream_new() will emit the error.
Willy Tarreau22de8d32018-09-05 19:55:58 +02002053 */
Willy Tarreaua8e49542018-10-03 18:53:55 +02002054 h2s = h2c_frt_stream_new(h2c, h2c->dsi);
Willy Tarreau13278b42017-10-13 19:23:14 +02002055 if (!h2s) {
Willy Tarreau96a10c22018-12-23 18:30:44 +01002056 h2s = (struct h2s*)h2_refused_stream;
2057 goto send_rst;
Willy Tarreau13278b42017-10-13 19:23:14 +02002058 }
2059
2060 h2s->st = H2_SS_OPEN;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002061 h2s->rxbuf = rxbuf;
2062 h2s->flags |= flags;
Willy Tarreau1915ca22019-01-24 11:49:37 +01002063 h2s->body_len = body_len;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002064
Willy Tarreau88d138e2019-01-02 19:38:14 +01002065 done:
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002066 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau13278b42017-10-13 19:23:14 +02002067 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002068
2069 if (h2s->flags & H2_SF_ES_RCVD) {
Willy Tarreaufc10f592019-01-30 19:28:32 +01002070 if (h2s->st == H2_SS_OPEN)
2071 h2s->st = H2_SS_HREM;
2072 else
2073 h2s_close(h2s);
Willy Tarreau13278b42017-10-13 19:23:14 +02002074 }
2075
Willy Tarreau3a429f02019-01-03 11:41:50 +01002076 /* update the max stream ID if the request is being processed */
2077 if (h2s->id > h2c->max_id)
2078 h2c->max_id = h2s->id;
Willy Tarreau13278b42017-10-13 19:23:14 +02002079
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002080 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002081
2082 conn_err:
2083 h2c_error(h2c, error);
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002084 goto out;
Willy Tarreau13278b42017-10-13 19:23:14 +02002085
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01002086 out:
2087 h2_release_buf(h2c, &rxbuf);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002088 return NULL;
Willy Tarreau96a10c22018-12-23 18:30:44 +01002089
2090 send_rst:
2091 /* make the demux send an RST for the current stream. We may only
2092 * do this if we're certain that the HEADERS frame was properly
2093 * decompressed so that the HPACK decoder is still kept up to date.
2094 */
2095 h2_release_buf(h2c, &rxbuf);
2096 h2c->st0 = H2_CS_FRAME_E;
2097 return h2s;
Willy Tarreau13278b42017-10-13 19:23:14 +02002098}
2099
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002100/* processes a HEADERS frame. Returns h2s on success or NULL on missing data.
2101 * It may return an error in h2c or h2s. Described in RFC7540#6.2. Most of the
2102 * errors here are reported as connection errors since it's impossible to
2103 * recover from such errors after the compression context has been altered.
2104 */
2105static struct h2s *h2c_bck_handle_headers(struct h2c *h2c, struct h2s *h2s)
2106{
2107 int error;
2108
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002109 if (!b_size(&h2c->dbuf))
2110 return NULL; // empty buffer
2111
2112 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
2113 return NULL; // incomplete frame
2114
Willy Tarreau1915ca22019-01-24 11:49:37 +01002115 error = h2c_decode_headers(h2c, &h2s->rxbuf, &h2s->flags, &h2s->body_len);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002116
Willy Tarreau25919232019-01-03 14:48:18 +01002117 /* unrecoverable error ? */
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002118 if (h2c->st0 >= H2_CS_ERROR)
2119 return NULL;
2120
Willy Tarreau08bb1d62019-01-30 16:55:48 +01002121 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2122 /* RFC7540#5.1 */
2123 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2124 h2c->st0 = H2_CS_FRAME_E;
2125 return NULL;
2126 }
2127
Willy Tarreau25919232019-01-03 14:48:18 +01002128 if (error <= 0) {
2129 if (error == 0)
2130 return NULL; // missing data
2131
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002132 /* stream error : send RST_STREAM */
Willy Tarreau25919232019-01-03 14:48:18 +01002133 h2s_error(h2s, H2_ERR_PROTOCOL_ERROR);
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002134 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau25919232019-01-03 14:48:18 +01002135 return NULL;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002136 }
2137
Christopher Fauletfa922f02019-05-07 10:55:17 +02002138 if (h2c->dff & H2_F_HEADERS_END_STREAM)
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002139 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreau45ffc0c2019-01-03 09:32:20 +01002140
Willy Tarreau927b88b2019-03-04 08:03:25 +01002141 if (h2s->cs && h2s->cs->flags & CS_FL_ERROR && h2s->st < H2_SS_ERROR)
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002142 h2s->st = H2_SS_ERROR;
Christopher Fauletfa922f02019-05-07 10:55:17 +02002143 else if (h2s->flags & H2_SF_ES_RCVD) {
2144 if (h2s->st == H2_SS_OPEN)
2145 h2s->st = H2_SS_HREM;
2146 else if (h2s->st == H2_SS_HLOC)
2147 h2s_close(h2s);
2148 }
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002149
2150 return h2s;
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002151}
2152
Willy Tarreau454f9052017-10-26 19:40:35 +02002153/* processes a DATA frame. Returns > 0 on success or zero on missing data.
2154 * It may return an error in h2c or h2s. Described in RFC7540#6.1.
2155 */
2156static int h2c_frt_handle_data(struct h2c *h2c, struct h2s *h2s)
2157{
2158 int error;
2159
2160 /* note that empty DATA frames are perfectly valid and sometimes used
2161 * to signal an end of stream (with the ES flag).
2162 */
2163
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002164 if (!b_size(&h2c->dbuf) && h2c->dfl)
Willy Tarreau454f9052017-10-26 19:40:35 +02002165 return 0; // empty buffer
2166
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002167 if (b_data(&h2c->dbuf) < h2c->dfl && !b_full(&h2c->dbuf))
Willy Tarreau454f9052017-10-26 19:40:35 +02002168 return 0; // incomplete frame
2169
2170 /* now either the frame is complete or the buffer is complete */
2171
Willy Tarreau454f9052017-10-26 19:40:35 +02002172 if (h2s->st != H2_SS_OPEN && h2s->st != H2_SS_HLOC) {
2173 /* RFC7540#6.1 */
2174 error = H2_ERR_STREAM_CLOSED;
2175 goto strm_err;
2176 }
2177
Willy Tarreau1915ca22019-01-24 11:49:37 +01002178 if ((h2s->flags & H2_SF_DATA_CLEN) && h2c->dfl > h2s->body_len) {
2179 /* RFC7540#8.1.2 */
2180 error = H2_ERR_PROTOCOL_ERROR;
2181 goto strm_err;
2182 }
2183
Willy Tarreaua56a6de2018-02-26 15:59:07 +01002184 if (!h2_frt_transfer_data(h2s))
2185 return 0;
2186
Willy Tarreau454f9052017-10-26 19:40:35 +02002187 /* call the upper layers to process the frame, then let the upper layer
2188 * notify the stream about any change.
2189 */
2190 if (!h2s->cs) {
2191 error = H2_ERR_STREAM_CLOSED;
2192 goto strm_err;
2193 }
2194
Willy Tarreau8f650c32017-11-21 19:36:21 +01002195 if (h2c->st0 >= H2_CS_ERROR)
2196 return 0;
2197
Willy Tarreau721c9742017-11-07 11:05:42 +01002198 if (h2s->st >= H2_SS_ERROR) {
Willy Tarreau454f9052017-10-26 19:40:35 +02002199 /* stream error : send RST_STREAM */
Willy Tarreaua20a5192017-12-27 11:02:06 +01002200 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002201 }
2202
2203 /* check for completion : the callee will change this to FRAME_A or
2204 * FRAME_H once done.
2205 */
2206 if (h2c->st0 == H2_CS_FRAME_P)
2207 return 0;
2208
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002209 /* last frame */
2210 if (h2c->dff & H2_F_DATA_END_STREAM) {
Christopher Fauletfa922f02019-05-07 10:55:17 +02002211 h2s->flags |= H2_SF_ES_RCVD;
Willy Tarreaufc10f592019-01-30 19:28:32 +01002212 if (h2s->st == H2_SS_OPEN)
2213 h2s->st = H2_SS_HREM;
2214 else
2215 h2s_close(h2s);
2216
Willy Tarreau1915ca22019-01-24 11:49:37 +01002217 if (h2s->flags & H2_SF_DATA_CLEN && h2s->body_len) {
2218 /* RFC7540#8.1.2 */
2219 error = H2_ERR_PROTOCOL_ERROR;
2220 goto strm_err;
2221 }
Willy Tarreauc4134ba2017-12-11 18:45:08 +01002222 }
2223
Willy Tarreau454f9052017-10-26 19:40:35 +02002224 return 1;
2225
Willy Tarreau454f9052017-10-26 19:40:35 +02002226 strm_err:
Willy Tarreau6432dc82019-01-30 15:42:44 +01002227 h2s_error(h2s, error);
2228 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau454f9052017-10-26 19:40:35 +02002229 return 0;
2230}
2231
Willy Tarreaubc933932017-10-09 16:21:43 +02002232/* process Rx frames to be demultiplexed */
2233static void h2_process_demux(struct h2c *h2c)
2234{
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002235 struct h2s *h2s = NULL, *tmp_h2s;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002236 struct h2_fh hdr;
2237 unsigned int padlen = 0;
Willy Tarreauf3ee0692017-10-17 08:18:25 +02002238
Willy Tarreau081d4722017-05-16 21:51:05 +02002239 if (h2c->st0 >= H2_CS_ERROR)
2240 return;
Willy Tarreau52eed752017-09-22 15:05:09 +02002241
2242 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2243 if (h2c->st0 == H2_CS_PREFACE) {
Willy Tarreau01b44822018-10-03 14:26:37 +02002244 if (h2c->flags & H2_CF_IS_BACK)
2245 return;
Willy Tarreau52eed752017-09-22 15:05:09 +02002246 if (unlikely(h2c_frt_recv_preface(h2c) <= 0)) {
2247 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002248 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau52eed752017-09-22 15:05:09 +02002249 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002250 sess_log(h2c->conn->owner);
2251 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002252 goto fail;
2253 }
2254
2255 h2c->max_id = 0;
2256 h2c->st0 = H2_CS_SETTINGS1;
2257 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002258
2259 if (h2c->st0 == H2_CS_SETTINGS1) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002260 /* ensure that what is pending is a valid SETTINGS frame
2261 * without an ACK.
2262 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002263 if (!h2_get_frame_hdr(&h2c->dbuf, &hdr)) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002264 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
Willy Tarreau22de8d32018-09-05 19:55:58 +02002265 if (h2c->st0 == H2_CS_ERROR) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002266 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002267 sess_log(h2c->conn->owner);
2268 }
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002269 goto fail;
2270 }
2271
2272 if (hdr.sid || hdr.ft != H2_FT_SETTINGS || hdr.ff & H2_F_SETTINGS_ACK) {
2273 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2274 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2275 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002276 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002277 goto fail;
2278 }
2279
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002280 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002281 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2282 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2283 h2c->st0 = H2_CS_ERROR2;
Willy Tarreau22de8d32018-09-05 19:55:58 +02002284 sess_log(h2c->conn->owner);
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002285 goto fail;
2286 }
2287
Willy Tarreau3bf69182018-12-21 15:34:50 +01002288 /* that's OK, switch to FRAME_P to process it. This is
2289 * a SETTINGS frame whose header has already been
2290 * deleted above.
2291 */
Willy Tarreau54f46e52019-01-30 15:11:03 +01002292 padlen = 0;
2293 goto new_frame;
Willy Tarreau4c3690b2017-10-10 15:16:55 +02002294 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002295 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002296
2297 /* process as many incoming frames as possible below */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002298 while (b_data(&h2c->dbuf)) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002299 int ret = 0;
2300
2301 if (h2c->st0 >= H2_CS_ERROR)
2302 break;
2303
2304 if (h2c->st0 == H2_CS_FRAME_H) {
Willy Tarreaua4428bd2018-12-22 18:11:41 +01002305 if (!h2_peek_frame_hdr(&h2c->dbuf, 0, &hdr))
Willy Tarreau7e98c052017-10-10 15:56:59 +02002306 break;
2307
Willy Tarreau3f0e1ec2018-04-17 10:28:27 +02002308 if ((int)hdr.len < 0 || (int)hdr.len > global.tune.bufsize) {
Willy Tarreau7e98c052017-10-10 15:56:59 +02002309 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002310 if (!h2c->nb_streams) {
2311 /* only log if no other stream can report the error */
2312 sess_log(h2c->conn->owner);
2313 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002314 break;
2315 }
2316
Willy Tarreau3bf69182018-12-21 15:34:50 +01002317 if (h2_ft_bit(hdr.ft) & H2_FT_PADDED_MASK && hdr.ff & H2_F_PADDED) {
2318 /* If the frame is padded (HEADERS, PUSH_PROMISE or DATA),
2319 * we read the pad length and drop it from the remaining
2320 * payload (one byte + the 9 remaining ones = 10 total
2321 * removed), so we have a frame payload starting after the
2322 * pad len. Flow controlled frames (DATA) also count the
2323 * padlen in the flow control, so it must be adjusted.
2324 */
2325 if (hdr.len < 1) {
2326 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
2327 sess_log(h2c->conn->owner);
2328 goto fail;
2329 }
2330 hdr.len--;
2331
2332 if (b_data(&h2c->dbuf) < 10)
2333 break; // missing padlen
2334
2335 padlen = *(uint8_t *)b_peek(&h2c->dbuf, 9);
2336
2337 if (padlen > hdr.len) {
2338 /* RFC7540#6.1 : pad length = length of
2339 * frame payload or greater => error.
2340 */
2341 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2342 sess_log(h2c->conn->owner);
2343 goto fail;
2344 }
2345
2346 if (h2_ft_bit(hdr.ft) & H2_FT_FC_MASK) {
2347 h2c->rcvd_c++;
2348 h2c->rcvd_s++;
2349 }
2350 b_del(&h2c->dbuf, 1);
2351 }
2352 h2_skip_frame_hdr(&h2c->dbuf);
Willy Tarreau54f46e52019-01-30 15:11:03 +01002353
2354 new_frame:
Willy Tarreau7e98c052017-10-10 15:56:59 +02002355 h2c->dfl = hdr.len;
2356 h2c->dsi = hdr.sid;
2357 h2c->dft = hdr.ft;
2358 h2c->dff = hdr.ff;
Willy Tarreau3bf69182018-12-21 15:34:50 +01002359 h2c->dpl = padlen;
Willy Tarreau7e98c052017-10-10 15:56:59 +02002360 h2c->st0 = H2_CS_FRAME_P;
Willy Tarreau54f46e52019-01-30 15:11:03 +01002361
2362 /* check for minimum basic frame format validity */
2363 ret = h2_frame_check(h2c->dft, 1, h2c->dsi, h2c->dfl, global.tune.bufsize);
2364 if (ret != H2_ERR_NO_ERROR) {
2365 h2c_error(h2c, ret);
2366 sess_log(h2c->conn->owner);
2367 goto fail;
2368 }
Willy Tarreau7e98c052017-10-10 15:56:59 +02002369 }
2370
2371 /* Only H2_CS_FRAME_P and H2_CS_FRAME_A here */
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002372 tmp_h2s = h2c_st_by_id(h2c, h2c->dsi);
2373
Willy Tarreau567beb82018-12-18 16:52:44 +01002374 if (tmp_h2s != h2s && h2s && h2s->cs &&
2375 (b_data(&h2s->rxbuf) ||
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002376 (H2_SS_MASK(h2s->st) & H2_SS_EOS_BITS) ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02002377 (h2s->flags & H2_SF_ES_RCVD) ||
2378 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002379 /* we may have to signal the upper layers */
2380 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01002381 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002382 }
2383 h2s = tmp_h2s;
Willy Tarreau7e98c052017-10-10 15:56:59 +02002384
Willy Tarreaud7901432017-12-29 11:34:40 +01002385 if (h2c->st0 == H2_CS_FRAME_E)
2386 goto strm_err;
2387
Willy Tarreauf65b80d2017-10-30 11:46:49 +01002388 if (h2s->st == H2_SS_IDLE &&
2389 h2c->dft != H2_FT_HEADERS && h2c->dft != H2_FT_PRIORITY) {
2390 /* RFC7540#5.1: any frame other than HEADERS or PRIORITY in
2391 * this state MUST be treated as a connection error
2392 */
2393 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreau22de8d32018-09-05 19:55:58 +02002394 if (!h2c->nb_streams) {
2395 /* only log if no other stream can report the error */
2396 sess_log(h2c->conn->owner);
2397 }
Willy Tarreauf65b80d2017-10-30 11:46:49 +01002398 break;
2399 }
2400
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002401 if (h2s->st == H2_SS_HREM && h2c->dft != H2_FT_WINDOW_UPDATE &&
2402 h2c->dft != H2_FT_RST_STREAM && h2c->dft != H2_FT_PRIORITY) {
2403 /* RFC7540#5.1: any frame other than WU/PRIO/RST in
Willy Tarreau5b4eae32019-01-24 09:43:32 +01002404 * this state MUST be treated as a stream error.
2405 * 6.2, 6.6 and 6.10 further mandate that HEADERS/
2406 * PUSH_PROMISE/CONTINUATION cause connection errors.
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002407 */
Willy Tarreau5b4eae32019-01-24 09:43:32 +01002408 if (h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK)
2409 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2410 else
2411 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002412 goto strm_err;
2413 }
2414
Willy Tarreauab837502017-12-27 15:07:30 +01002415 /* Below the management of frames received in closed state is a
2416 * bit hackish because the spec makes strong differences between
2417 * streams closed by receiving RST, sending RST, and seeing ES
2418 * in both directions. In addition to this, the creation of a
2419 * new stream reusing the identifier of a closed one will be
2420 * detected here. Given that we cannot keep track of all closed
2421 * streams forever, we consider that unknown closed streams were
2422 * closed on RST received, which allows us to respond with an
2423 * RST without breaking the connection (eg: to abort a transfer).
2424 * Some frames have to be silently ignored as well.
2425 */
2426 if (h2s->st == H2_SS_CLOSED && h2c->dsi) {
Willy Tarreau3ad5d312019-01-29 18:33:26 +01002427 if (!(h2c->flags & H2_CF_IS_BACK) && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreauab837502017-12-27 15:07:30 +01002428 /* #5.1.1: The identifier of a newly
2429 * established stream MUST be numerically
2430 * greater than all streams that the initiating
2431 * endpoint has opened or reserved. This
2432 * governs streams that are opened using a
2433 * HEADERS frame and streams that are reserved
2434 * using PUSH_PROMISE. An endpoint that
2435 * receives an unexpected stream identifier
2436 * MUST respond with a connection error.
2437 */
2438 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
2439 goto strm_err;
2440 }
2441
Willy Tarreau8d9ac3e2019-01-30 16:58:30 +01002442 if (h2s->flags & H2_SF_RST_RCVD && h2_ft_bit(h2c->dft) & H2_FT_HDR_MASK) {
Willy Tarreauab837502017-12-27 15:07:30 +01002443 /* RFC7540#5.1:closed: an endpoint that
2444 * receives any frame other than PRIORITY after
2445 * receiving a RST_STREAM MUST treat that as a
2446 * stream error of type STREAM_CLOSED.
2447 *
2448 * Note that old streams fall into this category
2449 * and will lead to an RST being sent.
Willy Tarreau8d9ac3e2019-01-30 16:58:30 +01002450 *
2451 * However, we cannot generalize this to all frame types. Those
2452 * carrying compression state must still be processed before
2453 * being dropped or we'll desynchronize the decoder. This can
2454 * happen with request trailers received after sending an
2455 * RST_STREAM, or with header/trailers responses received after
2456 * sending RST_STREAM (aborted stream).
Willy Tarreauab837502017-12-27 15:07:30 +01002457 */
2458 h2s_error(h2s, H2_ERR_STREAM_CLOSED);
2459 h2c->st0 = H2_CS_FRAME_E;
2460 goto strm_err;
2461 }
2462
2463 /* RFC7540#5.1:closed: if this state is reached as a
2464 * result of sending a RST_STREAM frame, the peer that
2465 * receives the RST_STREAM might have already sent
2466 * frames on the stream that cannot be withdrawn. An
2467 * endpoint MUST ignore frames that it receives on
2468 * closed streams after it has sent a RST_STREAM
2469 * frame. An endpoint MAY choose to limit the period
2470 * over which it ignores frames and treat frames that
2471 * arrive after this time as being in error.
2472 */
Willy Tarreau24ff1f82019-01-30 19:20:09 +01002473 if (h2s->id && !(h2s->flags & H2_SF_RST_SENT)) {
Willy Tarreauab837502017-12-27 15:07:30 +01002474 /* RFC7540#5.1:closed: any frame other than
2475 * PRIO/WU/RST in this state MUST be treated as
2476 * a connection error
2477 */
2478 if (h2c->dft != H2_FT_RST_STREAM &&
2479 h2c->dft != H2_FT_PRIORITY &&
2480 h2c->dft != H2_FT_WINDOW_UPDATE) {
2481 h2c_error(h2c, H2_ERR_STREAM_CLOSED);
2482 goto strm_err;
2483 }
2484 }
2485 }
2486
Willy Tarreauc0da1962017-10-30 18:38:00 +01002487#if 0
2488 // problem below: it is not possible to completely ignore such
2489 // streams as we need to maintain the compression state as well
2490 // and for this we need to completely process these frames (eg:
2491 // HEADERS frames) as well as counting DATA frames to emit
2492 // proper WINDOW UPDATES and ensure the connection doesn't stall.
2493 // This is a typical case of layer violation where the
2494 // transported contents are critical to the connection's
2495 // validity and must be ignored at the same time :-(
2496
2497 /* graceful shutdown, ignore streams whose ID is higher than
2498 * the one advertised in GOAWAY. RFC7540#6.8.
2499 */
2500 if (unlikely(h2c->last_sid >= 0) && h2c->dsi > h2c->last_sid) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002501 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
2502 b_del(&h2c->dbuf, ret);
Willy Tarreauc0da1962017-10-30 18:38:00 +01002503 h2c->dfl -= ret;
2504 ret = h2c->dfl == 0;
2505 goto strm_err;
2506 }
2507#endif
2508
Willy Tarreau7e98c052017-10-10 15:56:59 +02002509 switch (h2c->dft) {
Willy Tarreau3421aba2017-07-27 15:41:03 +02002510 case H2_FT_SETTINGS:
2511 if (h2c->st0 == H2_CS_FRAME_P)
2512 ret = h2c_handle_settings(h2c);
2513
2514 if (h2c->st0 == H2_CS_FRAME_A)
2515 ret = h2c_ack_settings(h2c);
2516 break;
2517
Willy Tarreaucf68c782017-10-10 17:11:41 +02002518 case H2_FT_PING:
2519 if (h2c->st0 == H2_CS_FRAME_P)
2520 ret = h2c_handle_ping(h2c);
2521
2522 if (h2c->st0 == H2_CS_FRAME_A)
2523 ret = h2c_ack_ping(h2c);
2524 break;
2525
Willy Tarreau26f95952017-07-27 17:18:30 +02002526 case H2_FT_WINDOW_UPDATE:
2527 if (h2c->st0 == H2_CS_FRAME_P)
2528 ret = h2c_handle_window_update(h2c, h2s);
2529 break;
2530
Willy Tarreau61290ec2017-10-17 08:19:21 +02002531 case H2_FT_CONTINUATION:
Willy Tarreauea18f862018-12-22 20:19:26 +01002532 /* RFC7540#6.10: CONTINUATION may only be preceeded by
2533 * a HEADERS/PUSH_PROMISE/CONTINUATION frame. These
2534 * frames' parsers consume all following CONTINUATION
2535 * frames so this one is out of sequence.
Willy Tarreau61290ec2017-10-17 08:19:21 +02002536 */
Willy Tarreauea18f862018-12-22 20:19:26 +01002537 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
2538 sess_log(h2c->conn->owner);
2539 goto fail;
Willy Tarreau61290ec2017-10-17 08:19:21 +02002540
Willy Tarreau13278b42017-10-13 19:23:14 +02002541 case H2_FT_HEADERS:
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002542 if (h2c->st0 == H2_CS_FRAME_P) {
Willy Tarreauc12f38f2018-10-08 14:53:27 +02002543 if (h2c->flags & H2_CF_IS_BACK)
2544 tmp_h2s = h2c_bck_handle_headers(h2c, h2s);
2545 else
2546 tmp_h2s = h2c_frt_handle_headers(h2c, h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002547 if (tmp_h2s) {
2548 h2s = tmp_h2s;
2549 ret = 1;
2550 }
2551 }
Willy Tarreau13278b42017-10-13 19:23:14 +02002552 break;
2553
Willy Tarreau454f9052017-10-26 19:40:35 +02002554 case H2_FT_DATA:
2555 if (h2c->st0 == H2_CS_FRAME_P)
2556 ret = h2c_frt_handle_data(h2c, h2s);
2557
2558 if (h2c->st0 == H2_CS_FRAME_A)
2559 ret = h2c_send_strm_wu(h2c);
2560 break;
Willy Tarreaucd234e92017-08-18 10:59:39 +02002561
Willy Tarreau92153fc2017-12-03 19:46:19 +01002562 case H2_FT_PRIORITY:
2563 if (h2c->st0 == H2_CS_FRAME_P)
2564 ret = h2c_handle_priority(h2c);
2565 break;
2566
Willy Tarreaucd234e92017-08-18 10:59:39 +02002567 case H2_FT_RST_STREAM:
2568 if (h2c->st0 == H2_CS_FRAME_P)
2569 ret = h2c_handle_rst_stream(h2c, h2s);
2570 break;
2571
Willy Tarreaue96b0922017-10-30 00:28:29 +01002572 case H2_FT_GOAWAY:
2573 if (h2c->st0 == H2_CS_FRAME_P)
2574 ret = h2c_handle_goaway(h2c);
2575 break;
2576
Willy Tarreau1c661982017-10-30 13:52:01 +01002577 /* implement all extra frame types here */
Willy Tarreau7e98c052017-10-10 15:56:59 +02002578 default:
2579 /* drop frames that we ignore. They may be larger than
2580 * the buffer so we drain all of their contents until
2581 * we reach the end.
2582 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002583 ret = MIN(b_data(&h2c->dbuf), h2c->dfl);
2584 b_del(&h2c->dbuf, ret);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002585 h2c->dfl -= ret;
2586 ret = h2c->dfl == 0;
2587 }
2588
Willy Tarreauf182a9a2017-10-30 12:03:50 +01002589 strm_err:
Willy Tarreaua20a5192017-12-27 11:02:06 +01002590 /* We may have to send an RST if not done yet */
2591 if (h2s->st == H2_SS_ERROR)
2592 h2c->st0 = H2_CS_FRAME_E;
Willy Tarreau27a84c92017-10-17 08:10:17 +02002593
Willy Tarreaua20a5192017-12-27 11:02:06 +01002594 if (h2c->st0 == H2_CS_FRAME_E)
2595 ret = h2c_send_rst_stream(h2c, h2s);
Willy Tarreau27a84c92017-10-17 08:10:17 +02002596
Willy Tarreau7e98c052017-10-10 15:56:59 +02002597 /* error or missing data condition met above ? */
Willy Tarreau1ed87b72018-11-25 08:45:16 +01002598 if (ret <= 0)
Willy Tarreau7e98c052017-10-10 15:56:59 +02002599 break;
2600
2601 if (h2c->st0 != H2_CS_FRAME_H) {
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002602 b_del(&h2c->dbuf, h2c->dfl);
Willy Tarreau7e98c052017-10-10 15:56:59 +02002603 h2c->st0 = H2_CS_FRAME_H;
2604 }
2605 }
Willy Tarreau52eed752017-09-22 15:05:09 +02002606
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002607 if (h2c->rcvd_c > 0 &&
2608 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM)))
2609 h2c_send_conn_wu(h2c);
2610
Willy Tarreau52eed752017-09-22 15:05:09 +02002611 fail:
2612 /* we can go here on missing data, blocked response or error */
Willy Tarreau567beb82018-12-18 16:52:44 +01002613 if (h2s && h2s->cs &&
2614 (b_data(&h2s->rxbuf) ||
Willy Tarreau99ad1b32019-05-14 11:46:28 +02002615 (H2_SS_MASK(h2s->st) & H2_SS_EOS_BITS) ||
Christopher Fauletfa922f02019-05-07 10:55:17 +02002616 (h2s->flags & H2_SF_ES_RCVD) ||
2617 (h2s->cs->flags & (CS_FL_ERROR|CS_FL_ERR_PENDING|CS_FL_EOS)))) {
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002618 /* we may have to signal the upper layers */
2619 h2s->cs->flags |= CS_FL_RCV_MORE;
Willy Tarreau7e094452018-12-19 18:08:52 +01002620 h2s_notify_recv(h2s);
Willy Tarreau2a761dc2018-02-26 18:50:57 +01002621 }
Willy Tarreau1ed87b72018-11-25 08:45:16 +01002622
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02002623 h2c_restart_reading(h2c, 0);
Willy Tarreaubc933932017-10-09 16:21:43 +02002624}
2625
2626/* process Tx frames from streams to be multiplexed. Returns > 0 if it reached
2627 * the end.
2628 */
2629static int h2_process_mux(struct h2c *h2c)
2630{
Olivier Houchard998410a2019-04-15 19:23:37 +02002631 struct h2s *h2s, *h2s_back;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002632
Willy Tarreau01b44822018-10-03 14:26:37 +02002633 if (unlikely(h2c->st0 < H2_CS_FRAME_H)) {
2634 if (unlikely(h2c->st0 == H2_CS_PREFACE && (h2c->flags & H2_CF_IS_BACK))) {
2635 if (unlikely(h2c_bck_send_preface(h2c) <= 0)) {
2636 /* RFC7540#3.5: a GOAWAY frame MAY be omitted */
2637 if (h2c->st0 == H2_CS_ERROR) {
2638 h2c->st0 = H2_CS_ERROR2;
2639 sess_log(h2c->conn->owner);
2640 }
2641 goto fail;
2642 }
2643 h2c->st0 = H2_CS_SETTINGS1;
2644 }
2645 /* need to wait for the other side */
Willy Tarreau75a930a2018-12-12 08:03:58 +01002646 if (h2c->st0 < H2_CS_FRAME_H)
Willy Tarreau01b44822018-10-03 14:26:37 +02002647 return 1;
2648 }
2649
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002650 /* start by sending possibly pending window updates */
2651 if (h2c->rcvd_c > 0 &&
2652 !(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_MUX_MALLOC)) &&
2653 h2c_send_conn_wu(h2c) < 0)
2654 goto fail;
2655
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002656 /* First we always process the flow control list because the streams
2657 * waiting there were already elected for immediate emission but were
2658 * blocked just on this.
2659 */
2660
Olivier Houchard998410a2019-04-15 19:23:37 +02002661 list_for_each_entry_safe(h2s, h2s_back, &h2c->fctl_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002662 if (h2c->mws <= 0 || h2c->flags & H2_CF_MUX_BLOCK_ANY ||
2663 h2c->st0 >= H2_CS_ERROR)
2664 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002665
Willy Tarreauc234ae32019-05-13 17:56:11 +02002666 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002667 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002668
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002669 h2s->flags &= ~H2_SF_BLK_ANY;
Olivier Houchard998410a2019-04-15 19:23:37 +02002670 /* For some reason, the upper layer failed to subsribe again,
2671 * so remove it from the send_list
2672 */
2673 if (!h2s->send_wait) {
2674 LIST_DEL_INIT(&h2s->list);
2675 continue;
2676 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002677 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01002678 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002679 tasklet_wakeup(h2s->send_wait->task);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002680 }
2681
Olivier Houchard998410a2019-04-15 19:23:37 +02002682 list_for_each_entry_safe(h2s, h2s_back, &h2c->send_list, list) {
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002683 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
2684 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002685
Willy Tarreauc234ae32019-05-13 17:56:11 +02002686 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002687 continue;
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002688
Olivier Houchard998410a2019-04-15 19:23:37 +02002689 /* For some reason, the upper layer failed to subsribe again,
2690 * so remove it from the send_list
2691 */
2692 if (!h2s->send_wait) {
2693 LIST_DEL_INIT(&h2s->list);
2694 continue;
2695 }
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002696 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002697 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardd360ac62019-03-22 17:37:16 +01002698 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002699 tasklet_wakeup(h2s->send_wait->task);
Willy Tarreaubacdf5a2017-10-17 10:57:04 +02002700 }
2701
Willy Tarreaucc0b8c32017-10-26 16:55:59 +02002702 fail:
Willy Tarreau3eabe9b2017-11-07 11:03:01 +01002703 if (unlikely(h2c->st0 >= H2_CS_ERROR)) {
Willy Tarreau081d4722017-05-16 21:51:05 +02002704 if (h2c->st0 == H2_CS_ERROR) {
2705 if (h2c->max_id >= 0) {
2706 h2c_send_goaway_error(h2c, NULL);
2707 if (h2c->flags & H2_CF_MUX_BLOCK_ANY)
2708 return 0;
2709 }
2710
2711 h2c->st0 = H2_CS_ERROR2; // sent (or failed hard) !
2712 }
2713 return 1;
2714 }
Olivier Houchardd360ac62019-03-22 17:37:16 +01002715 return (1);
Willy Tarreaubc933932017-10-09 16:21:43 +02002716}
2717
Willy Tarreau62f52692017-10-08 23:01:42 +02002718
Willy Tarreau479998a2018-11-18 06:30:59 +01002719/* Attempt to read data, and subscribe if none available.
2720 * The function returns 1 if data has been received, otherwise zero.
2721 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002722static int h2_recv(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002723{
Olivier Houchardaf4021e2018-08-09 13:06:55 +02002724 struct connection *conn = h2c->conn;
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02002725 struct buffer *buf;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002726 int max;
Olivier Houchard7505f942018-08-21 18:10:44 +02002727 size_t ret;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002728
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002729 if (h2c->wait_event.events & SUB_RETRY_RECV)
Olivier Houchard81a15af2018-10-19 17:26:49 +02002730 return (b_data(&h2c->dbuf));
Olivier Houchardaf4021e2018-08-09 13:06:55 +02002731
Willy Tarreau315d8072017-12-10 22:17:57 +01002732 if (!h2_recv_allowed(h2c))
Olivier Houchard81a15af2018-10-19 17:26:49 +02002733 return 1;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002734
Willy Tarreau44e973f2018-03-01 17:49:30 +01002735 buf = h2_get_buf(h2c, &h2c->dbuf);
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02002736 if (!buf) {
2737 h2c->flags |= H2_CF_DEM_DALLOC;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002738 return 0;
Willy Tarreau1b62c5c2017-09-25 11:55:01 +02002739 }
Willy Tarreau35dbd5d2017-09-22 09:13:49 +02002740
Olivier Houchard7505f942018-08-21 18:10:44 +02002741 do {
Willy Tarreaue0f24ee2018-12-14 10:51:23 +01002742 b_realign_if_empty(buf);
Willy Tarreau2a59e872018-12-12 08:23:47 +01002743 if (!b_data(buf) && (h2c->proxy->options2 & PR_O2_USE_HTX)) {
2744 /* HTX in use : try to pre-align the buffer like the
2745 * rxbufs will be to optimize memory copies. We'll make
2746 * sure that the frame header lands at the end of the
2747 * HTX block to alias it upon recv. We cannot use the
2748 * head because rcv_buf() will realign the buffer if
2749 * it's empty. Thus we cheat and pretend we already
2750 * have a few bytes there.
2751 */
2752 max = buf_room_for_htx_data(buf) + 9;
Willy Tarreauc0960d12018-12-14 10:59:15 +01002753 buf->head = sizeof(struct htx) - 9;
Willy Tarreau2a59e872018-12-12 08:23:47 +01002754 }
2755 else
2756 max = b_room(buf);
2757
Olivier Houchard7505f942018-08-21 18:10:44 +02002758 if (max)
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002759 ret = conn->xprt->rcv_buf(conn, conn->xprt_ctx, buf, max, 0);
Olivier Houchard7505f942018-08-21 18:10:44 +02002760 else
2761 ret = 0;
2762 } while (ret > 0);
Willy Tarreaua2af5122017-10-09 11:56:46 +02002763
Olivier Houchard53216e72018-10-10 15:46:36 +02002764 if (h2_recv_allowed(h2c) && (b_data(buf) < buf->size))
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002765 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_RECV, &h2c->wait_event);
Olivier Houchard81a15af2018-10-19 17:26:49 +02002766
Olivier Houcharda1411e62018-08-17 18:42:48 +02002767 if (!b_data(buf)) {
Willy Tarreau44e973f2018-03-01 17:49:30 +01002768 h2_release_buf(h2c, &h2c->dbuf);
Olivier Houchard46677732018-11-29 17:06:17 +01002769 return (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn));
Willy Tarreaua2af5122017-10-09 11:56:46 +02002770 }
2771
Willy Tarreaub7b5fe12018-06-18 13:33:09 +02002772 if (b_data(buf) == buf->size)
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002773 h2c->flags |= H2_CF_DEM_DFULL;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002774 return 1;
Willy Tarreau62f52692017-10-08 23:01:42 +02002775}
2776
Willy Tarreau479998a2018-11-18 06:30:59 +01002777/* Try to send data if possible.
2778 * The function returns 1 if data have been sent, otherwise zero.
2779 */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002780static int h2_send(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002781{
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002782 struct connection *conn = h2c->conn;
Willy Tarreaubc933932017-10-09 16:21:43 +02002783 int done;
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002784 int sent = 0;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002785
2786 if (conn->flags & CO_FL_ERROR)
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01002787 return 1;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002788
Olivier Houchard7505f942018-08-21 18:10:44 +02002789
Willy Tarreaua2af5122017-10-09 11:56:46 +02002790 if (conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN)) {
2791 /* a handshake was requested */
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002792 goto schedule;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002793 }
2794
Willy Tarreaubc933932017-10-09 16:21:43 +02002795 /* This loop is quite simple : it tries to fill as much as it can from
2796 * pending streams into the existing buffer until it's reportedly full
2797 * or the end of send requests is reached. Then it tries to send this
2798 * buffer's contents out, marks it not full if at least one byte could
2799 * be sent, and tries again.
2800 *
2801 * The snd_buf() function normally takes a "flags" argument which may
2802 * be made of a combination of CO_SFL_MSG_MORE to indicate that more
2803 * data immediately comes and CO_SFL_STREAMER to indicate that the
2804 * connection is streaming lots of data (used to increase TLS record
2805 * size at the expense of latency). The former can be sent any time
2806 * there's a buffer full flag, as it indicates at least one stream
2807 * attempted to send and failed so there are pending data. An
2808 * alternative would be to set it as long as there's an active stream
2809 * but that would be problematic for ACKs until we have an absolute
2810 * guarantee that all waiters have at least one byte to send. The
2811 * latter should possibly not be set for now.
2812 */
2813
2814 done = 0;
2815 while (!done) {
2816 unsigned int flags = 0;
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002817 unsigned int released = 0;
2818 struct buffer *buf;
Willy Tarreaubc933932017-10-09 16:21:43 +02002819
2820 /* fill as much as we can into the current buffer */
2821 while (((h2c->flags & (H2_CF_MUX_MFULL|H2_CF_MUX_MALLOC)) == 0) && !done)
2822 done = h2_process_mux(h2c);
2823
Olivier Houchard2b094432019-01-29 18:28:36 +01002824 if (h2c->flags & H2_CF_MUX_MALLOC)
2825 break;
2826
Willy Tarreaubc933932017-10-09 16:21:43 +02002827 if (conn->flags & CO_FL_ERROR)
2828 break;
2829
2830 if (h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MBUSY | H2_CF_DEM_MROOM))
2831 flags |= CO_SFL_MSG_MORE;
2832
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002833 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
2834 if (b_data(buf)) {
2835 int ret = conn->xprt->snd_buf(conn, conn->xprt_ctx, buf, b_data(buf), flags);
2836 if (!ret)
2837 break;
2838 sent = 1;
2839 b_del(buf, ret);
2840 if (b_data(buf))
2841 break;
2842 }
2843 b_free(buf);
2844 released++;
Willy Tarreau787db9a2018-06-14 18:31:46 +02002845 }
Willy Tarreaubc933932017-10-09 16:21:43 +02002846
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02002847 if (released)
2848 offer_buffers(h2c->buf_wait.target, tasks_run_queue);
2849
Willy Tarreaubc933932017-10-09 16:21:43 +02002850 /* wrote at least one byte, the buffer is not full anymore */
2851 h2c->flags &= ~(H2_CF_MUX_MFULL | H2_CF_DEM_MROOM);
2852 }
2853
Willy Tarreaua2af5122017-10-09 11:56:46 +02002854 if (conn->flags & CO_FL_SOCK_WR_SH) {
2855 /* output closed, nothing to send, clear the buffer to release it */
Willy Tarreau51330962019-05-26 09:38:07 +02002856 b_reset(br_tail(h2c->mbuf));
Willy Tarreaua2af5122017-10-09 11:56:46 +02002857 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02002858 /* We're not full anymore, so we can wake any task that are waiting
2859 * for us.
2860 */
2861 if (!(h2c->flags & (H2_CF_MUX_MFULL | H2_CF_DEM_MROOM))) {
Olivier Houchardd360ac62019-03-22 17:37:16 +01002862 struct h2s *h2s;
2863
2864 list_for_each_entry(h2s, &h2c->send_list, list) {
2865 if (h2c->st0 >= H2_CS_ERROR || h2c->flags & H2_CF_MUX_BLOCK_ANY)
2866 break;
Olivier Houchard998410a2019-04-15 19:23:37 +02002867
Willy Tarreauc234ae32019-05-13 17:56:11 +02002868 if (LIST_ADDED(&h2s->sending_list))
Olivier Houchardd360ac62019-03-22 17:37:16 +01002869 continue;
2870
Olivier Houchard998410a2019-04-15 19:23:37 +02002871 /* For some reason, the upper layer failed to subsribe again,
2872 * so remove it from the send_list
2873 */
2874 if (!h2s->send_wait) {
2875 LIST_DEL_INIT(&h2s->list);
2876 continue;
2877 }
Olivier Houchardd360ac62019-03-22 17:37:16 +01002878 h2s->flags &= ~H2_SF_BLK_ANY;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002879 h2s->send_wait->events &= ~SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02002880 tasklet_wakeup(h2s->send_wait->task);
Olivier Houchardd360ac62019-03-22 17:37:16 +01002881 LIST_ADDQ(&h2c->sending_list, &h2s->sending_list);
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02002882 }
Olivier Houchard6ff20392018-07-17 18:46:31 +02002883 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002884 /* We're done, no more to send */
Willy Tarreau662fafc2019-05-26 09:43:07 +02002885 if (!br_data(h2c->mbuf))
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002886 return sent;
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002887schedule:
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002888 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houcharde179d0e2019-03-21 18:27:17 +01002889 conn->xprt->subscribe(conn, conn->xprt_ctx, SUB_RETRY_SEND, &h2c->wait_event);
Olivier Houchardd4dd22d2018-08-17 18:39:46 +02002890 return sent;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002891}
2892
Willy Tarreau749f5ca2019-03-21 19:19:36 +01002893/* this is the tasklet referenced in h2c->wait_event.task */
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002894static struct task *h2_io_cb(struct task *t, void *ctx, unsigned short status)
2895{
2896 struct h2c *h2c = ctx;
Olivier Houchard7505f942018-08-21 18:10:44 +02002897 int ret = 0;
Olivier Houchard29fb89d2018-08-02 18:56:36 +02002898
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002899 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard7505f942018-08-21 18:10:44 +02002900 ret = h2_send(h2c);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01002901 if (!(h2c->wait_event.events & SUB_RETRY_RECV))
Olivier Houchard7505f942018-08-21 18:10:44 +02002902 ret |= h2_recv(h2c);
Willy Tarreaucef5c8e2018-12-18 10:29:54 +01002903 if (ret || b_data(&h2c->dbuf))
Olivier Houchard7505f942018-08-21 18:10:44 +02002904 h2_process(h2c);
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002905 return NULL;
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002906}
Willy Tarreaua2af5122017-10-09 11:56:46 +02002907
Willy Tarreau62f52692017-10-08 23:01:42 +02002908/* callback called on any event by the connection handler.
2909 * It applies changes and returns zero, or < 0 if it wants immediate
2910 * destruction of the connection (which normally doesn not happen in h2).
2911 */
Olivier Houchard7505f942018-08-21 18:10:44 +02002912static int h2_process(struct h2c *h2c)
Willy Tarreau62f52692017-10-08 23:01:42 +02002913{
Olivier Houchard7505f942018-08-21 18:10:44 +02002914 struct connection *conn = h2c->conn;
Willy Tarreaua2af5122017-10-09 11:56:46 +02002915
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002916 if (b_data(&h2c->dbuf) && !(h2c->flags & H2_CF_DEM_BLOCK_ANY)) {
Willy Tarreaud13bf272017-12-14 10:34:52 +01002917 h2_process_demux(h2c);
2918
2919 if (h2c->st0 >= H2_CS_ERROR || conn->flags & CO_FL_ERROR)
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002920 b_reset(&h2c->dbuf);
Willy Tarreaud13bf272017-12-14 10:34:52 +01002921
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002922 if (!b_full(&h2c->dbuf))
Willy Tarreaud13bf272017-12-14 10:34:52 +01002923 h2c->flags &= ~H2_CF_DEM_DFULL;
2924 }
Olivier Houchard7505f942018-08-21 18:10:44 +02002925 h2_send(h2c);
Willy Tarreaud13bf272017-12-14 10:34:52 +01002926
Willy Tarreau0b37d652018-10-03 10:33:02 +02002927 if (unlikely(h2c->proxy->state == PR_STSTOPPED)) {
Willy Tarreau8ec14062017-12-30 18:08:13 +01002928 /* frontend is stopping, reload likely in progress, let's try
2929 * to announce a graceful shutdown if not yet done. We don't
2930 * care if it fails, it will be tried again later.
2931 */
2932 if (!(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
2933 if (h2c->last_sid < 0)
2934 h2c->last_sid = (1U << 31) - 1;
2935 h2c_send_goaway_error(h2c, NULL);
2936 }
2937 }
2938
Olivier Houchard7fc96d52017-11-23 18:25:47 +01002939 /*
Olivier Houchard6fa63d92017-11-27 18:41:32 +01002940 * If we received early data, and the handshake is done, wake
2941 * any stream that was waiting for it.
Olivier Houchard7fc96d52017-11-23 18:25:47 +01002942 */
Olivier Houchard6fa63d92017-11-27 18:41:32 +01002943 if (!(h2c->flags & H2_CF_WAIT_FOR_HS) &&
2944 (conn->flags & (CO_FL_EARLY_SSL_HS | CO_FL_HANDSHAKE | CO_FL_EARLY_DATA)) == CO_FL_EARLY_DATA) {
2945 struct eb32_node *node;
2946 struct h2s *h2s;
2947
2948 h2c->flags |= H2_CF_WAIT_FOR_HS;
2949 node = eb32_lookup_ge(&h2c->streams_by_id, 1);
2950
2951 while (node) {
2952 h2s = container_of(node, struct h2s, by_id);
Willy Tarreaufde287c2018-12-19 18:33:16 +01002953 if (h2s->cs && h2s->cs->flags & CS_FL_WAIT_FOR_HS)
Willy Tarreau7e094452018-12-19 18:08:52 +01002954 h2s_notify_recv(h2s);
Olivier Houchard6fa63d92017-11-27 18:41:32 +01002955 node = eb32_next(node);
2956 }
Olivier Houchard7fc96d52017-11-23 18:25:47 +01002957 }
Olivier Houchard6fa63d92017-11-27 18:41:32 +01002958
Willy Tarreau26bd7612017-10-09 16:47:04 +02002959 if (conn->flags & CO_FL_ERROR || conn_xprt_read0_pending(conn) ||
Willy Tarreau29a98242017-10-31 06:59:15 +01002960 h2c->st0 == H2_CS_ERROR2 || h2c->flags & H2_CF_GOAWAY_FAILED ||
2961 (eb_is_empty(&h2c->streams_by_id) && h2c->last_sid >= 0 &&
2962 h2c->max_id >= h2c->last_sid)) {
Willy Tarreau23482912019-05-07 15:23:14 +02002963 h2_wake_some_streams(h2c, 0);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002964
2965 if (eb_is_empty(&h2c->streams_by_id)) {
2966 /* no more stream, kill the connection now */
Christopher Faulet73c12072019-04-08 11:23:22 +02002967 h2_release(h2c);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002968 return -1;
2969 }
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002970 }
2971
Willy Tarreauc9fa0482018-07-10 17:43:27 +02002972 if (!b_data(&h2c->dbuf))
Willy Tarreau44e973f2018-03-01 17:49:30 +01002973 h2_release_buf(h2c, &h2c->dbuf);
Willy Tarreaufbe3b4f2017-10-09 15:14:19 +02002974
Olivier Houchard53216e72018-10-10 15:46:36 +02002975 if ((conn->flags & CO_FL_SOCK_WR_SH) ||
2976 h2c->st0 == H2_CS_ERROR2 || (h2c->flags & H2_CF_GOAWAY_FAILED) ||
2977 (h2c->st0 != H2_CS_ERROR &&
Willy Tarreau662fafc2019-05-26 09:43:07 +02002978 !br_data(h2c->mbuf) &&
Olivier Houchard53216e72018-10-10 15:46:36 +02002979 (h2c->mws <= 0 || LIST_ISEMPTY(&h2c->fctl_list)) &&
2980 ((h2c->flags & H2_CF_MUX_BLOCK_ANY) || LIST_ISEMPTY(&h2c->send_list))))
Willy Tarreau2e3c0002019-05-26 09:45:23 +02002981 h2_release_mbuf(h2c);
Willy Tarreaua2af5122017-10-09 11:56:46 +02002982
Willy Tarreau3f133572017-10-31 19:21:06 +01002983 if (h2c->task) {
Willy Tarreau662fafc2019-05-26 09:43:07 +02002984 if (eb_is_empty(&h2c->streams_by_id) || br_data(h2c->mbuf)) {
Willy Tarreau599391a2017-11-24 10:16:00 +01002985 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
Willy Tarreau3f133572017-10-31 19:21:06 +01002986 task_queue(h2c->task);
2987 }
2988 else
2989 h2c->task->expire = TICK_ETERNITY;
Willy Tarreauea392822017-10-31 10:02:25 +01002990 }
Olivier Houchard910b2bc2018-07-17 18:49:38 +02002991
Olivier Houchard7505f942018-08-21 18:10:44 +02002992 h2_send(h2c);
Willy Tarreau62f52692017-10-08 23:01:42 +02002993 return 0;
2994}
2995
Willy Tarreau749f5ca2019-03-21 19:19:36 +01002996/* wake-up function called by the connection layer (mux_ops.wake) */
Olivier Houchard21df6cc2018-09-14 23:21:44 +02002997static int h2_wake(struct connection *conn)
2998{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01002999 struct h2c *h2c = conn->ctx;
Olivier Houchard21df6cc2018-09-14 23:21:44 +02003000
3001 return (h2_process(h2c));
3002}
3003
Willy Tarreauea392822017-10-31 10:02:25 +01003004/* Connection timeout management. The principle is that if there's no receipt
3005 * nor sending for a certain amount of time, the connection is closed. If the
3006 * MUX buffer still has lying data or is not allocatable, the connection is
3007 * immediately killed. If it's allocatable and empty, we attempt to send a
3008 * GOAWAY frame.
3009 */
Olivier Houchard9f6af332018-05-25 14:04:04 +02003010static struct task *h2_timeout_task(struct task *t, void *context, unsigned short state)
Willy Tarreauea392822017-10-31 10:02:25 +01003011{
Olivier Houchard9f6af332018-05-25 14:04:04 +02003012 struct h2c *h2c = context;
Willy Tarreauea392822017-10-31 10:02:25 +01003013 int expired = tick_is_expired(t->expire, now_ms);
3014
Willy Tarreau0975f112018-03-29 15:22:59 +02003015 if (!expired && h2c)
Willy Tarreauea392822017-10-31 10:02:25 +01003016 return t;
3017
Olivier Houchard3f795f72019-04-17 22:51:06 +02003018 task_destroy(t);
Willy Tarreau0975f112018-03-29 15:22:59 +02003019
3020 if (!h2c) {
3021 /* resources were already deleted */
3022 return NULL;
3023 }
3024
3025 h2c->task = NULL;
Willy Tarreauea392822017-10-31 10:02:25 +01003026 h2c_error(h2c, H2_ERR_NO_ERROR);
Willy Tarreau23482912019-05-07 15:23:14 +02003027 h2_wake_some_streams(h2c, 0);
Willy Tarreauea392822017-10-31 10:02:25 +01003028
Willy Tarreau662fafc2019-05-26 09:43:07 +02003029 if (br_data(h2c->mbuf)) {
Willy Tarreauea392822017-10-31 10:02:25 +01003030 /* don't even try to send a GOAWAY, the buffer is stuck */
3031 h2c->flags |= H2_CF_GOAWAY_FAILED;
3032 }
3033
3034 /* try to send but no need to insist */
Willy Tarreau599391a2017-11-24 10:16:00 +01003035 h2c->last_sid = h2c->max_id;
Willy Tarreauea392822017-10-31 10:02:25 +01003036 if (h2c_send_goaway_error(h2c, NULL) <= 0)
3037 h2c->flags |= H2_CF_GOAWAY_FAILED;
3038
Willy Tarreau662fafc2019-05-26 09:43:07 +02003039 if (br_data(h2c->mbuf) && !(h2c->flags & H2_CF_GOAWAY_FAILED) && conn_xprt_ready(h2c->conn)) {
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003040 unsigned int released = 0;
3041 struct buffer *buf;
3042
3043 for (buf = br_head(h2c->mbuf); b_size(buf); buf = br_del_head(h2c->mbuf)) {
3044 if (b_data(buf)) {
3045 int ret = h2c->conn->xprt->snd_buf(h2c->conn, h2c->conn->xprt_ctx, buf, b_data(buf), 0);
3046 if (!ret)
3047 break;
3048 b_del(buf, ret);
3049 if (b_data(buf))
3050 break;
3051 b_free(buf);
3052 released++;
3053 }
Willy Tarreau787db9a2018-06-14 18:31:46 +02003054 }
Willy Tarreau41c4d6a2019-05-26 09:49:17 +02003055
3056 if (released)
3057 offer_buffers(h2c->buf_wait.target, tasks_run_queue);
Willy Tarreau787db9a2018-06-14 18:31:46 +02003058 }
Willy Tarreauea392822017-10-31 10:02:25 +01003059
Willy Tarreau0975f112018-03-29 15:22:59 +02003060 /* either we can release everything now or it will be done later once
3061 * the last stream closes.
3062 */
3063 if (eb_is_empty(&h2c->streams_by_id))
Christopher Faulet73c12072019-04-08 11:23:22 +02003064 h2_release(h2c);
Willy Tarreauea392822017-10-31 10:02:25 +01003065
Willy Tarreauea392822017-10-31 10:02:25 +01003066 return NULL;
3067}
3068
3069
Willy Tarreau62f52692017-10-08 23:01:42 +02003070/*******************************************/
3071/* functions below are used by the streams */
3072/*******************************************/
3073
3074/*
3075 * Attach a new stream to a connection
3076 * (Used for outgoing connections)
3077 */
Olivier Houchardf502aca2018-12-14 19:42:40 +01003078static struct conn_stream *h2_attach(struct connection *conn, struct session *sess)
Willy Tarreau62f52692017-10-08 23:01:42 +02003079{
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003080 struct conn_stream *cs;
3081 struct h2s *h2s;
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003082 struct h2c *h2c = conn->ctx;
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003083
3084 cs = cs_new(conn);
3085 if (!cs)
3086 return NULL;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003087 h2s = h2c_bck_stream_new(h2c, cs, sess);
Olivier Houchard7a57e8a2018-11-27 17:36:33 +01003088 if (!h2s) {
3089 cs_free(cs);
3090 return NULL;
3091 }
3092 return cs;
Willy Tarreau62f52692017-10-08 23:01:42 +02003093}
3094
Willy Tarreaufafd3982018-11-18 21:29:20 +01003095/* Retrieves the first valid conn_stream from this connection, or returns NULL.
3096 * We have to scan because we may have some orphan streams. It might be
3097 * beneficial to scan backwards from the end to reduce the likeliness to find
3098 * orphans.
3099 */
3100static const struct conn_stream *h2_get_first_cs(const struct connection *conn)
3101{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01003102 struct h2c *h2c = conn->ctx;
Willy Tarreaufafd3982018-11-18 21:29:20 +01003103 struct h2s *h2s;
3104 struct eb32_node *node;
3105
3106 node = eb32_first(&h2c->streams_by_id);
3107 while (node) {
3108 h2s = container_of(node, struct h2s, by_id);
3109 if (h2s->cs)
3110 return h2s->cs;
3111 node = eb32_next(node);
3112 }
3113 return NULL;
3114}
3115
Willy Tarreau62f52692017-10-08 23:01:42 +02003116/*
Olivier Houchard060ed432018-11-06 16:32:42 +01003117 * Destroy the mux and the associated connection, if it is no longer used
3118 */
Christopher Faulet73c12072019-04-08 11:23:22 +02003119static void h2_destroy(void *ctx)
Olivier Houchard060ed432018-11-06 16:32:42 +01003120{
Christopher Faulet73c12072019-04-08 11:23:22 +02003121 struct h2c *h2c = ctx;
Olivier Houchard060ed432018-11-06 16:32:42 +01003122
Christopher Faulet39a96ee2019-04-08 10:52:21 +02003123 if (eb_is_empty(&h2c->streams_by_id) || !h2c->conn || h2c->conn->ctx != h2c)
Christopher Faulet73c12072019-04-08 11:23:22 +02003124 h2_release(h2c);
Olivier Houchard060ed432018-11-06 16:32:42 +01003125}
3126
3127/*
Willy Tarreau62f52692017-10-08 23:01:42 +02003128 * Detach the stream from the connection and possibly release the connection.
3129 */
3130static void h2_detach(struct conn_stream *cs)
3131{
Willy Tarreau60935142017-10-16 18:11:19 +02003132 struct h2s *h2s = cs->ctx;
3133 struct h2c *h2c;
Olivier Houchardf502aca2018-12-14 19:42:40 +01003134 struct session *sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003135
3136 cs->ctx = NULL;
3137 if (!h2s)
3138 return;
3139
Olivier Houchard998410a2019-04-15 19:23:37 +02003140 /* The stream is about to die, so no need to attempt to run its task */
Willy Tarreauc234ae32019-05-13 17:56:11 +02003141 if (LIST_ADDED(&h2s->sending_list) &&
Olivier Houchard998410a2019-04-15 19:23:37 +02003142 h2s->send_wait != &h2s->wait_event) {
3143 task_remove_from_tasklet_list((struct task *)h2s->send_wait->task);
3144 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd9986ed2019-05-09 13:24:08 +02003145 /*
3146 * At this point, the stream_interface is supposed to have called
3147 * h2_unsubscribe(), so the only way there's still a
3148 * subscription that came from the stream_interface (as we
3149 * can subscribe ourself, in h2_do_shutw() and h2_do_shutr(),
3150 * without the stream_interface involved) is that we subscribed
3151 * for sending, we woke the tasklet up and removed the
3152 * SUB_RETRY_SEND flag, so the stream_interface would not
3153 * know it has to unsubscribe for send, but the tasklet hasn't
3154 * run yet. Make sure to handle that by explicitely setting
3155 * send_wait to NULL, as nothing else will do it for us.
3156 */
3157 h2s->send_wait = NULL;
Olivier Houchard998410a2019-04-15 19:23:37 +02003158 }
3159
Olivier Houchardf502aca2018-12-14 19:42:40 +01003160 sess = h2s->sess;
Willy Tarreau60935142017-10-16 18:11:19 +02003161 h2c = h2s->h2c;
3162 h2s->cs = NULL;
Willy Tarreau7ac60e82018-07-19 09:04:05 +02003163 h2c->nb_cs--;
Willy Tarreaufa1d3572019-01-31 10:31:51 +01003164 if ((h2c->flags & (H2_CF_IS_BACK|H2_CF_DEM_TOOMANY)) == H2_CF_DEM_TOOMANY &&
3165 !h2_frt_has_too_many_cs(h2c)) {
3166 /* frontend connection was blocking new streams creation */
Willy Tarreauf2101912018-07-19 10:11:38 +02003167 h2c->flags &= ~H2_CF_DEM_TOOMANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003168 h2c_restart_reading(h2c, 1);
Willy Tarreauf2101912018-07-19 10:11:38 +02003169 }
Willy Tarreau60935142017-10-16 18:11:19 +02003170
Willy Tarreau22cf59b2017-11-10 11:42:33 +01003171 /* this stream may be blocked waiting for some data to leave (possibly
3172 * an ES or RST frame), so orphan it in this case.
3173 */
Willy Tarreau3041fcc2018-03-29 15:41:32 +02003174 if (!(cs->conn->flags & CO_FL_ERROR) &&
Willy Tarreaua2b51812018-07-27 09:55:14 +02003175 (h2c->st0 < H2_CS_ERROR) &&
Olivier Houchard16ff2612019-03-21 15:48:46 +01003176 (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 +01003177 return;
3178
Willy Tarreau45f752e2017-10-30 15:44:59 +01003179 if ((h2c->flags & H2_CF_DEM_BLOCK_ANY && h2s->id == h2c->dsi) ||
3180 (h2c->flags & H2_CF_MUX_BLOCK_ANY && h2s->id == h2c->msi)) {
3181 /* unblock the connection if it was blocked on this
3182 * stream.
3183 */
3184 h2c->flags &= ~H2_CF_DEM_BLOCK_ANY;
3185 h2c->flags &= ~H2_CF_MUX_BLOCK_ANY;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02003186 h2c_restart_reading(h2c, 1);
Willy Tarreau45f752e2017-10-30 15:44:59 +01003187 }
3188
Willy Tarreau71049cc2018-03-28 13:56:39 +02003189 h2s_destroy(h2s);
Willy Tarreau60935142017-10-16 18:11:19 +02003190
Olivier Houchard8a786902018-12-15 16:05:40 +01003191 if (h2c->flags & H2_CF_IS_BACK &&
3192 (h2c->proxy->options2 & PR_O2_USE_HTX)) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003193 if (!(h2c->conn->flags &
3194 (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_SOCK_WR_SH))) {
3195 if (!h2c->conn->owner) {
Olivier Houchardf502aca2018-12-14 19:42:40 +01003196 h2c->conn->owner = sess;
Olivier Houchard351411f2018-12-27 17:20:54 +01003197 if (!session_add_conn(sess, h2c->conn, h2c->conn->target)) {
3198 h2c->conn->owner = NULL;
3199 if (eb_is_empty(&h2c->streams_by_id)) {
3200 if (!srv_add_to_idle_list(objt_server(h2c->conn->target), h2c->conn))
3201 /* The server doesn't want it, let's kill the connection right away */
3202 h2c->conn->mux->destroy(h2c->conn);
3203 return;
3204 }
3205 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003206 }
Olivier Houcharda4d4fdf2018-12-14 19:27:06 +01003207 if (eb_is_empty(&h2c->streams_by_id)) {
3208 if (session_check_idle_conn(h2c->conn->owner, h2c->conn) != 0)
3209 /* At this point either the connection is destroyed, or it's been added to the server idle list, just stop */
3210 return;
3211 }
Olivier Houchard8a786902018-12-15 16:05:40 +01003212 /* Never ever allow to reuse a connection from a non-reuse backend */
3213 if ((h2c->proxy->options & PR_O_REUSE_MASK) == PR_O_REUSE_NEVR)
3214 h2c->conn->flags |= CO_FL_PRIVATE;
Willy Tarreauc234ae32019-05-13 17:56:11 +02003215 if (!LIST_ADDED(&h2c->conn->list) && h2c->nb_streams < h2c->streams_limit) {
Olivier Houchard8a786902018-12-15 16:05:40 +01003216 struct server *srv = objt_server(h2c->conn->target);
3217
3218 if (srv) {
3219 if (h2c->conn->flags & CO_FL_PRIVATE)
3220 LIST_ADD(&srv->priv_conns[tid], &h2c->conn->list);
3221 else
3222 LIST_ADD(&srv->idle_conns[tid], &h2c->conn->list);
3223 }
3224
3225 }
3226 }
3227 }
3228
Willy Tarreaue323f342018-03-28 13:51:45 +02003229 /* We don't want to close right now unless we're removing the
3230 * last stream, and either the connection is in error, or it
3231 * reached the ID already specified in a GOAWAY frame received
3232 * or sent (as seen by last_sid >= 0).
3233 */
Olivier Houchard7a977432019-03-21 15:47:13 +01003234 if (h2c_is_dead(h2c)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02003235 /* no more stream will come, kill it now */
Christopher Faulet73c12072019-04-08 11:23:22 +02003236 h2_release(h2c);
Willy Tarreaue323f342018-03-28 13:51:45 +02003237 }
3238 else if (h2c->task) {
Willy Tarreau662fafc2019-05-26 09:43:07 +02003239 if (eb_is_empty(&h2c->streams_by_id) || br_data(h2c->mbuf)) {
Willy Tarreaue323f342018-03-28 13:51:45 +02003240 h2c->task->expire = tick_add(now_ms, h2c->last_sid < 0 ? h2c->timeout : h2c->shut_timeout);
3241 task_queue(h2c->task);
Willy Tarreaue6ae77f2017-11-07 11:59:51 +01003242 }
Willy Tarreaue323f342018-03-28 13:51:45 +02003243 else
3244 h2c->task->expire = TICK_ETERNITY;
Willy Tarreau60935142017-10-16 18:11:19 +02003245 }
Willy Tarreau62f52692017-10-08 23:01:42 +02003246}
3247
Willy Tarreau88bdba32019-05-13 18:17:53 +02003248/* Performs a synchronous or asynchronous shutr(). */
3249static void h2_do_shutr(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003250{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003251 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003252 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003253
Willy Tarreauf983d002019-05-14 10:40:21 +02003254 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003255 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003256
Willy Tarreau18059042019-01-31 19:12:48 +01003257 /* a connstream may require us to immediately kill the whole connection
3258 * for example because of a "tcp-request content reject" rule that is
3259 * normally used to limit abuse. In this case we schedule a goaway to
3260 * close the connection.
Willy Tarreau926fa4c2017-11-07 14:42:12 +01003261 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003262 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003263 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3264 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3265 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3266 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003267 else if (!(h2s->flags & H2_SF_HEADERS_SENT)) {
3268 /* Nothing was never sent for this stream, so reset with
3269 * REFUSED_STREAM error to let the client retry the
3270 * request.
3271 */
3272 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3273 }
Willy Tarreau18059042019-01-31 19:12:48 +01003274
Willy Tarreau90c32322017-11-24 08:00:30 +01003275 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003276 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003277 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003278
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003279 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard435ce2d2018-12-03 18:43:16 +01003280 tasklet_wakeup(h2c->wait_event.task);
Willy Tarreau00dd0782018-03-01 16:31:34 +01003281 h2s_close(h2s);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003282 done:
3283 h2s->flags &= ~H2_SF_WANT_SHUTR;
3284 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003285add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02003286 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003287 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003288 if (h2s->flags & H2_SF_BLK_MFCTL) {
3289 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
3290 h2s->send_wait = sw;
3291 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
3292 h2s->send_wait = sw;
3293 LIST_ADDQ(&h2c->send_list, &h2s->list);
3294 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003295 }
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003296 /* Let the handler know we want shutr */
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003297 h2s->flags |= H2_SF_WANT_SHUTR;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003298 return;
Willy Tarreau62f52692017-10-08 23:01:42 +02003299}
3300
Willy Tarreau88bdba32019-05-13 18:17:53 +02003301/* Performs a synchronous or asynchronous shutw(). */
3302static void h2_do_shutw(struct h2s *h2s)
Willy Tarreau62f52692017-10-08 23:01:42 +02003303{
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003304 struct h2c *h2c = h2s->h2c;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003305 struct wait_event *sw = &h2s->wait_event;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003306
Willy Tarreauf983d002019-05-14 10:40:21 +02003307 if (h2s->st == H2_SS_CLOSED)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003308 goto done;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003309
Willy Tarreauf983d002019-05-14 10:40:21 +02003310 if (h2s->st != H2_SS_HLOC && h2s->st != H2_SS_ERROR &&
3311 (h2s->flags & H2_SF_HEADERS_SENT)) {
Willy Tarreau58e32082017-11-07 14:41:09 +01003312 /* we can cleanly close using an empty data frame only after headers */
3313
3314 if (!(h2s->flags & (H2_SF_ES_SENT|H2_SF_RST_SENT)) &&
3315 h2_send_empty_data_es(h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003316 goto add_to_list;
Willy Tarreau58e32082017-11-07 14:41:09 +01003317
3318 if (h2s->st == H2_SS_HREM)
Willy Tarreau00dd0782018-03-01 16:31:34 +01003319 h2s_close(h2s);
Willy Tarreau58e32082017-11-07 14:41:09 +01003320 else
3321 h2s->st = H2_SS_HLOC;
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003322 } else {
Willy Tarreau18059042019-01-31 19:12:48 +01003323 /* a connstream may require us to immediately kill the whole connection
3324 * for example because of a "tcp-request content reject" rule that is
3325 * normally used to limit abuse. In this case we schedule a goaway to
3326 * close the connection.
Willy Tarreaua1349f02017-10-31 07:41:55 +01003327 */
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003328 if ((h2s->flags & H2_SF_KILL_CONN) &&
Willy Tarreau18059042019-01-31 19:12:48 +01003329 !(h2c->flags & (H2_CF_GOAWAY_SENT|H2_CF_GOAWAY_FAILED))) {
3330 h2c_error(h2c, H2_ERR_ENHANCE_YOUR_CALM);
3331 h2s_error(h2s, H2_ERR_ENHANCE_YOUR_CALM);
3332 }
Christopher Faulet35757d32019-03-07 15:51:33 +01003333 else {
3334 /* Nothing was never sent for this stream, so reset with
3335 * REFUSED_STREAM error to let the client retry the
3336 * request.
3337 */
3338 h2s_error(h2s, H2_ERR_REFUSED_STREAM);
3339 }
Willy Tarreau18059042019-01-31 19:12:48 +01003340
Willy Tarreau90c32322017-11-24 08:00:30 +01003341 if (!(h2s->flags & H2_SF_RST_SENT) &&
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003342 h2s_send_rst_stream(h2c, h2s) <= 0)
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003343 goto add_to_list;
Willy Tarreau90c32322017-11-24 08:00:30 +01003344
Willy Tarreau00dd0782018-03-01 16:31:34 +01003345 h2s_close(h2s);
Willy Tarreauc7576ea2017-10-29 22:00:09 +01003346 }
3347
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003348 if (!(h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchard435ce2d2018-12-03 18:43:16 +01003349 tasklet_wakeup(h2c->wait_event.task);
Willy Tarreau88bdba32019-05-13 18:17:53 +02003350 done:
3351 h2s->flags &= ~H2_SF_WANT_SHUTW;
3352 return;
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003353
3354 add_to_list:
Willy Tarreauc234ae32019-05-13 17:56:11 +02003355 if (!LIST_ADDED(&h2s->list)) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01003356 sw->events |= SUB_RETRY_SEND;
Olivier Houchardfa8aa862018-10-10 18:25:41 +02003357 if (h2s->flags & H2_SF_BLK_MFCTL) {
3358 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
3359 h2s->send_wait = sw;
3360 } else if (h2s->flags & (H2_SF_BLK_MBUSY|H2_SF_BLK_MROOM)) {
3361 h2s->send_wait = sw;
3362 LIST_ADDQ(&h2c->send_list, &h2s->list);
3363 }
Willy Tarreaub2e290a2018-03-30 17:35:38 +02003364 }
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003365 /* let the handler know we want to shutw */
3366 h2s->flags |= H2_SF_WANT_SHUTW;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003367 return;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003368}
3369
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003370/* This is the tasklet referenced in h2s->wait_event.task, it is used for
3371 * deferred shutdowns when the h2_detach() was done but the mux buffer was full
3372 * and prevented the last frame from being emitted.
3373 */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003374static struct task *h2_deferred_shut(struct task *t, void *ctx, unsigned short state)
3375{
3376 struct h2s *h2s = ctx;
Willy Tarreau88bdba32019-05-13 18:17:53 +02003377 struct h2c *h2c = h2s->h2c;
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003378
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003379 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003380 if (h2s->flags & H2_SF_WANT_SHUTW)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003381 h2_do_shutw(h2s);
3382
Willy Tarreau2c249eb2019-05-13 18:06:17 +02003383 if (h2s->flags & H2_SF_WANT_SHUTR)
Willy Tarreau88bdba32019-05-13 18:17:53 +02003384 h2_do_shutr(h2s);
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003385
Willy Tarreau88bdba32019-05-13 18:17:53 +02003386 if (!(h2s->flags & (H2_SF_WANT_SHUTR|H2_SF_WANT_SHUTW))) {
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003387 /* We're done trying to send, remove ourself from the send_list */
Olivier Houchardafc7cb82019-03-25 14:08:01 +01003388 LIST_DEL_INIT(&h2s->list);
Olivier Houchard7a977432019-03-21 15:47:13 +01003389
Willy Tarreau88bdba32019-05-13 18:17:53 +02003390 if (!h2s->cs) {
3391 h2s_destroy(h2s);
3392 if (h2c_is_dead(h2c))
3393 h2_release(h2c);
3394 }
Olivier Houchard7a977432019-03-21 15:47:13 +01003395 }
3396
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003397 return NULL;
Willy Tarreau62f52692017-10-08 23:01:42 +02003398}
3399
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003400/* shutr() called by the conn_stream (mux_ops.shutr) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003401static void h2_shutr(struct conn_stream *cs, enum cs_shr_mode mode)
3402{
3403 struct h2s *h2s = cs->ctx;
3404
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003405 if (cs->flags & CS_FL_KILL_CONN)
3406 h2s->flags |= H2_SF_KILL_CONN;
3407
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003408 if (!mode)
3409 return;
3410
3411 h2_do_shutr(h2s);
3412}
3413
Willy Tarreau749f5ca2019-03-21 19:19:36 +01003414/* shutw() called by the conn_stream (mux_ops.shutw) */
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003415static void h2_shutw(struct conn_stream *cs, enum cs_shw_mode mode)
3416{
3417 struct h2s *h2s = cs->ctx;
3418
Willy Tarreau3cf69fe2019-05-14 10:44:40 +02003419 if (cs->flags & CS_FL_KILL_CONN)
3420 h2s->flags |= H2_SF_KILL_CONN;
3421
Olivier Houchard8ae735d2018-09-11 18:24:28 +02003422 h2_do_shutw(h2s);
3423}
3424
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003425/* Decode the payload of a HEADERS frame and produce the equivalent HTTP/1 or
Willy Tarreau86277d42019-01-02 15:36:11 +01003426 * HTX request or response depending on the connection's side. Returns a
3427 * positive value on success, a negative value on failure, or 0 if it couldn't
3428 * proceed. May report connection errors in h2c->errcode if the frame is
3429 * non-decodable and the connection unrecoverable. In absence of connection
3430 * error when a failure is reported, the caller must assume a stream error.
Willy Tarreauea18f862018-12-22 20:19:26 +01003431 *
3432 * The function may fold CONTINUATION frames into the initial HEADERS frame
3433 * by removing padding and next frame header, then moving the CONTINUATION
3434 * frame's payload and adjusting h2c->dfl to match the new aggregated frame,
3435 * leaving a hole between the main frame and the beginning of the next one.
3436 * The possibly remaining incomplete or next frame at the end may be moved
3437 * if the aggregated frame is not deleted, in order to fill the hole. Wrapped
3438 * HEADERS frames are unwrapped into a temporary buffer before decoding.
3439 *
3440 * A buffer at the beginning of processing may look like this :
3441 *
3442 * ,---.---------.-----.--------------.--------------.------.---.
3443 * |///| HEADERS | PAD | CONTINUATION | CONTINUATION | DATA |///|
3444 * `---^---------^-----^--------------^--------------^------^---'
3445 * | | <-----> | |
3446 * area | dpl | wrap
3447 * |<--------------> |
3448 * | dfl |
3449 * |<-------------------------------------------------->|
3450 * head data
3451 *
3452 * Padding is automatically overwritten when folding, participating to the
3453 * hole size after dfl :
3454 *
3455 * ,---.------------------------.-----.--------------.------.---.
3456 * |///| HEADERS : CONTINUATION |/////| CONTINUATION | DATA |///|
3457 * `---^------------------------^-----^--------------^------^---'
3458 * | | <-----> | |
3459 * area | hole | wrap
3460 * |<-----------------------> |
3461 * | dfl |
3462 * |<-------------------------------------------------->|
3463 * head data
3464 *
3465 * Please note that the HEADERS frame is always deprived from its PADLEN byte
3466 * however it may start with the 5 stream-dep+weight bytes in case of PRIORITY
3467 * bit.
Willy Tarreau6cc85a52019-01-02 15:49:20 +01003468 *
3469 * The <flags> field must point to either the stream's flags or to a copy of it
3470 * so that the function can update the following flags :
3471 * - H2_SF_DATA_CLEN when content-length is seen
3472 * - H2_SF_DATA_CHNK when chunking should be used for the H1 conversion
3473 * - H2_SF_HEADERS_RCVD once the frame is successfully decoded
Willy Tarreau88d138e2019-01-02 19:38:14 +01003474 *
3475 * The H2_SF_HEADERS_RCVD flag is also looked at in the <flags> field prior to
3476 * decoding, in order to detect if we're dealing with a headers or a trailers
3477 * block (the trailers block appears after H2_SF_HEADERS_RCVD was seen).
Willy Tarreau13278b42017-10-13 19:23:14 +02003478 */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003479static 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 +02003480{
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003481 const uint8_t *hdrs = (uint8_t *)b_head(&h2c->dbuf);
Willy Tarreau83061a82018-07-13 11:56:34 +02003482 struct buffer *tmp = get_trash_chunk();
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003483 struct http_hdr list[MAX_HTTP_HDR * 2];
Willy Tarreau83061a82018-07-13 11:56:34 +02003484 struct buffer *copy = NULL;
Willy Tarreau174b06a2018-04-25 18:13:58 +02003485 unsigned int msgf;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003486 struct htx *htx = NULL;
Willy Tarreauea18f862018-12-22 20:19:26 +01003487 int flen; // header frame len
3488 int hole = 0;
Willy Tarreau86277d42019-01-02 15:36:11 +01003489 int ret = 0;
3490 int outlen;
Willy Tarreau13278b42017-10-13 19:23:14 +02003491 int wrap;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003492 int try = 0;
Willy Tarreau13278b42017-10-13 19:23:14 +02003493
Willy Tarreauea18f862018-12-22 20:19:26 +01003494next_frame:
3495 if (b_data(&h2c->dbuf) - hole < h2c->dfl)
3496 goto leave; // incomplete input frame
3497
3498 /* No END_HEADERS means there's one or more CONTINUATION frames. In
3499 * this case, we'll try to paste it immediately after the initial
3500 * HEADERS frame payload and kill any possible padding. The initial
3501 * frame's length will be increased to represent the concatenation
3502 * of the two frames. The next frame is read from position <tlen>
3503 * and written at position <flen> (minus padding if some is present).
3504 */
3505 if (unlikely(!(h2c->dff & H2_F_HEADERS_END_HEADERS))) {
3506 struct h2_fh hdr;
3507 int clen; // CONTINUATION frame's payload length
3508
3509 if (!h2_peek_frame_hdr(&h2c->dbuf, h2c->dfl + hole, &hdr)) {
3510 /* no more data, the buffer may be full, either due to
3511 * too large a frame or because of too large a hole that
3512 * we're going to compact at the end.
3513 */
3514 goto leave;
3515 }
3516
3517 if (hdr.ft != H2_FT_CONTINUATION) {
3518 /* RFC7540#6.10: frame of unexpected type */
3519 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3520 goto fail;
3521 }
3522
3523 if (hdr.sid != h2c->dsi) {
3524 /* RFC7540#6.10: frame of different stream */
3525 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3526 goto fail;
3527 }
3528
3529 if ((unsigned)hdr.len > (unsigned)global.tune.bufsize) {
3530 /* RFC7540#4.2: invalid frame length */
3531 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3532 goto fail;
3533 }
3534
3535 /* detect when we must stop aggragating frames */
3536 h2c->dff |= hdr.ff & H2_F_HEADERS_END_HEADERS;
3537
3538 /* Take as much as we can of the CONTINUATION frame's payload */
3539 clen = b_data(&h2c->dbuf) - (h2c->dfl + hole + 9);
3540 if (clen > hdr.len)
3541 clen = hdr.len;
3542
3543 /* Move the frame's payload over the padding, hole and frame
3544 * header. At least one of hole or dpl is null (see diagrams
3545 * above). The hole moves after the new aggragated frame.
3546 */
3547 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole + 9), clen, -(h2c->dpl + hole + 9));
3548 h2c->dfl += clen - h2c->dpl;
3549 hole += h2c->dpl + 9;
3550 h2c->dpl = 0;
3551 goto next_frame;
3552 }
3553
3554 flen = h2c->dfl - h2c->dpl;
Willy Tarreau68472622017-12-11 18:36:37 +01003555
Willy Tarreau13278b42017-10-13 19:23:14 +02003556 /* if the input buffer wraps, take a temporary copy of it (rare) */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003557 wrap = b_wrap(&h2c->dbuf) - b_head(&h2c->dbuf);
Willy Tarreau13278b42017-10-13 19:23:14 +02003558 if (wrap < h2c->dfl) {
Willy Tarreau68dd9852017-07-03 14:44:26 +02003559 copy = alloc_trash_chunk();
3560 if (!copy) {
3561 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
3562 goto fail;
3563 }
Willy Tarreau843b7cb2018-07-13 10:54:26 +02003564 memcpy(copy->area, b_head(&h2c->dbuf), wrap);
3565 memcpy(copy->area + wrap, b_orig(&h2c->dbuf), h2c->dfl - wrap);
3566 hdrs = (uint8_t *) copy->area;
Willy Tarreau13278b42017-10-13 19:23:14 +02003567 }
3568
Willy Tarreau13278b42017-10-13 19:23:14 +02003569 /* Skip StreamDep and weight for now (we don't support PRIORITY) */
3570 if (h2c->dff & H2_F_HEADERS_PRIORITY) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003571 if (read_n32(hdrs) == h2c->dsi) {
Willy Tarreau18b86cd2017-12-03 19:24:50 +01003572 /* RFC7540#5.3.1 : stream dep may not depend on itself */
3573 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
Willy Tarreaua0d11b62018-09-05 18:30:05 +02003574 goto fail;
Willy Tarreau18b86cd2017-12-03 19:24:50 +01003575 }
3576
Willy Tarreaua01f45e2018-12-31 07:41:24 +01003577 if (flen < 5) {
3578 h2c_error(h2c, H2_ERR_FRAME_SIZE_ERROR);
3579 goto fail;
3580 }
3581
Willy Tarreau13278b42017-10-13 19:23:14 +02003582 hdrs += 5; // stream dep = 4, weight = 1
3583 flen -= 5;
3584 }
3585
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003586 if (!h2_get_buf(h2c, rxbuf)) {
Willy Tarreau937f7602018-02-26 15:22:17 +01003587 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau86277d42019-01-02 15:36:11 +01003588 goto leave;
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003589 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003590
Willy Tarreau937f7602018-02-26 15:22:17 +01003591 /* we can't retry a failed decompression operation so we must be very
3592 * careful not to take any risks. In practice the output buffer is
3593 * always empty except maybe for trailers, in which case we simply have
3594 * to wait for the upper layer to finish consuming what is available.
3595 */
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003596
3597 if (h2c->proxy->options2 & PR_O2_USE_HTX) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003598 htx = htx_from_buf(rxbuf);
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003599 if (!htx_is_empty(htx)) {
3600 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau86277d42019-01-02 15:36:11 +01003601 goto leave;
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003602 }
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003603 } else {
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003604 if (b_data(rxbuf)) {
3605 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau86277d42019-01-02 15:36:11 +01003606 goto leave;
Willy Tarreau8dbb1702019-01-03 08:52:09 +01003607 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003608
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003609 rxbuf->head = 0;
3610 try = b_size(rxbuf);
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003611 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003612
Willy Tarreau25919232019-01-03 14:48:18 +01003613 /* past this point we cannot roll back in case of error */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003614 outlen = hpack_decode_frame(h2c->ddht, hdrs, flen, list,
3615 sizeof(list)/sizeof(list[0]), tmp);
3616 if (outlen < 0) {
3617 h2c_error(h2c, H2_ERR_COMPRESSION_ERROR);
3618 goto fail;
3619 }
3620
Willy Tarreau25919232019-01-03 14:48:18 +01003621 /* The PACK decompressor was updated, let's update the input buffer and
3622 * the parser's state to commit these changes and allow us to later
3623 * fail solely on the stream if needed.
3624 */
3625 b_del(&h2c->dbuf, h2c->dfl + hole);
3626 h2c->dfl = hole = 0;
3627 h2c->st0 = H2_CS_FRAME_H;
3628
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003629 /* OK now we have our header list in <list> */
Willy Tarreau880f5802019-01-03 08:10:14 +01003630 msgf = (h2c->dff & H2_F_HEADERS_END_STREAM) ? 0 : H2_MSGF_BODY;
Willy Tarreaubd4a6b62018-11-27 09:29:36 +01003631
Willy Tarreau88d138e2019-01-02 19:38:14 +01003632 if (*flags & H2_SF_HEADERS_RCVD)
3633 goto trailers;
3634
3635 /* This is the first HEADERS frame so it's a headers block */
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003636 if (htx) {
3637 /* HTX mode */
3638 if (h2c->flags & H2_CF_IS_BACK)
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003639 outlen = h2_make_htx_response(list, htx, &msgf, body_len);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003640 else
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003641 outlen = h2_make_htx_request(list, htx, &msgf, body_len);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003642 } else {
3643 /* HTTP/1 mode */
Willy Tarreau4790f7c2019-01-24 11:33:02 +01003644 outlen = h2_make_h1_request(list, b_tail(rxbuf), try, &msgf, body_len);
Willy Tarreau83195932019-01-03 10:26:23 +01003645 if (outlen > 0)
3646 b_add(rxbuf, outlen);
Willy Tarreauc3e18f32018-10-08 14:51:56 +02003647 }
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003648
3649 if (outlen < 0) {
Willy Tarreau25919232019-01-03 14:48:18 +01003650 /* too large headers? this is a stream error only */
Willy Tarreau59a10fb2017-11-21 20:03:02 +01003651 goto fail;
3652 }
Willy Tarreau13278b42017-10-13 19:23:14 +02003653
Willy Tarreau174b06a2018-04-25 18:13:58 +02003654 if (msgf & H2_MSGF_BODY) {
3655 /* a payload is present */
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003656 if (msgf & H2_MSGF_BODY_CL) {
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003657 *flags |= H2_SF_DATA_CLEN;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003658 if (htx)
3659 htx->extra = *body_len;
3660 }
Olivier Houchard50d660c2018-12-08 00:18:31 +01003661 else if (!(msgf & H2_MSGF_BODY_TUNNEL) && !htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003662 *flags |= H2_SF_DATA_CHNK;
Willy Tarreau174b06a2018-04-25 18:13:58 +02003663 }
3664
Willy Tarreau88d138e2019-01-02 19:38:14 +01003665 done:
Christopher Faulet0b465482019-02-19 15:14:23 +01003666 /* indicate that a HEADERS frame was received for this stream, except
3667 * for 1xx responses. For 1xx responses, another HEADERS frame is
3668 * expected.
3669 */
3670 if (!(msgf & H2_MSGF_RSP_1XX))
3671 *flags |= H2_SF_HEADERS_RCVD;
Willy Tarreau6cc85a52019-01-02 15:49:20 +01003672
Christopher Faulet0b465482019-02-19 15:14:23 +01003673 if ((h2c->dff & H2_F_HEADERS_END_STREAM) || (msgf & H2_MSGF_RSP_1XX)) {
Willy Tarreau88d138e2019-01-02 19:38:14 +01003674 /* Mark the end of message, either using EOM in HTX or with the
3675 * trailing CRLF after the end of trailers. Note that DATA_CHNK
Willy Tarreau2135f912019-05-07 11:17:32 +02003676 * is not set during headers with END_STREAM. For HTX trailers,
3677 * we must not leave an HTX trailers block not followed by an
3678 * EOM block, the two must be atomic. Thus if we fail to emit
3679 * the EOM block we must remove the TLR block we've just added.
Willy Tarreau88d138e2019-01-02 19:38:14 +01003680 */
3681 if (htx) {
Willy Tarreau2135f912019-05-07 11:17:32 +02003682 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
3683 struct htx_blk *tail = htx_get_tail_blk(htx);
3684
3685 if (tail && htx_get_blk_type(tail) == HTX_BLK_TLR)
3686 htx_remove_blk(htx, tail);
Willy Tarreau88d138e2019-01-02 19:38:14 +01003687 goto fail;
Willy Tarreau2135f912019-05-07 11:17:32 +02003688 }
Willy Tarreau88d138e2019-01-02 19:38:14 +01003689 }
3690 else if (*flags & H2_SF_DATA_CHNK) {
3691 if (!b_putblk(rxbuf, "\r\n", 2))
3692 goto fail;
3693 }
3694 }
Willy Tarreau937f7602018-02-26 15:22:17 +01003695
Willy Tarreau86277d42019-01-02 15:36:11 +01003696 /* success */
3697 ret = 1;
3698
Willy Tarreau68dd9852017-07-03 14:44:26 +02003699 leave:
Willy Tarreau86277d42019-01-02 15:36:11 +01003700 /* If there is a hole left and it's not at the end, we are forced to
Willy Tarreauea18f862018-12-22 20:19:26 +01003701 * move the remaining data over it.
3702 */
3703 if (hole) {
3704 if (b_data(&h2c->dbuf) > h2c->dfl + hole)
3705 b_move(&h2c->dbuf, b_peek_ofs(&h2c->dbuf, h2c->dfl + hole),
3706 b_data(&h2c->dbuf) - (h2c->dfl + hole), -hole);
3707 b_sub(&h2c->dbuf, hole);
3708 }
3709
Willy Tarreau97215ca2019-04-29 10:20:21 +02003710 if (b_full(&h2c->dbuf) && h2c->dfl >= b_data(&h2c->dbuf)) {
Willy Tarreauea18f862018-12-22 20:19:26 +01003711 /* too large frames */
3712 h2c_error(h2c, H2_ERR_INTERNAL_ERROR);
Willy Tarreau86277d42019-01-02 15:36:11 +01003713 ret = -1;
Willy Tarreauea18f862018-12-22 20:19:26 +01003714 }
3715
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01003716 if (htx)
Willy Tarreau5c8cafa2018-12-23 11:30:42 +01003717 htx_to_buf(htx, rxbuf);
Willy Tarreau68dd9852017-07-03 14:44:26 +02003718 free_trash_chunk(copy);
Willy Tarreau86277d42019-01-02 15:36:11 +01003719 return ret;
3720
Willy Tarreau68dd9852017-07-03 14:44:26 +02003721 fail:
Willy Tarreau86277d42019-01-02 15:36:11 +01003722 ret = -1;
Willy Tarreau68dd9852017-07-03 14:44:26 +02003723 goto leave;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003724
3725 trailers:
3726 /* This is the last HEADERS frame hence a trailer */
3727
3728 if (!(h2c->dff & H2_F_HEADERS_END_STREAM)) {
3729 /* It's a trailer but it's missing ES flag */
3730 h2c_error(h2c, H2_ERR_PROTOCOL_ERROR);
3731 goto fail;
3732 }
3733
3734 /* Trailers terminate a DATA sequence. In HTX we have to emit an EOD
3735 * block, and when using chunks we must send the 0 CRLF marker. For
3736 * other modes, the trailers are silently dropped.
3737 */
3738 if (htx) {
3739 if (!htx_add_endof(htx, HTX_BLK_EOD))
3740 goto fail;
Willy Tarreau5255f282019-01-03 18:41:05 +01003741 if (h2_make_htx_trailers(list, htx) <= 0)
3742 goto fail;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003743 }
3744 else if (*flags & H2_SF_DATA_CHNK) {
3745 /* Legacy mode with chunked encoding : we must finalize the
3746 * data block message emit the trailing CRLF */
3747 if (!b_putblk(rxbuf, "0\r\n", 3))
3748 goto fail;
Willy Tarreaue2b05cc2019-01-03 16:18:34 +01003749
3750 outlen = h2_make_h1_trailers(list, b_tail(rxbuf), try);
3751 if (outlen > 0)
3752 b_add(rxbuf, outlen);
3753 else
3754 goto fail;
Willy Tarreau88d138e2019-01-02 19:38:14 +01003755 }
3756
3757 goto done;
Willy Tarreau13278b42017-10-13 19:23:14 +02003758}
3759
Willy Tarreau454f9052017-10-26 19:40:35 +02003760/* Transfer the payload of a DATA frame to the HTTP/1 side. When content-length
3761 * or a tunnel is used, the contents are copied as-is. When chunked encoding is
3762 * in use, a new chunk is emitted for each frame. This is supposed to fit
3763 * because the smallest chunk takes 1 byte for the size, 2 for CRLF, X for the
3764 * data, 2 for the extra CRLF, so that's 5+X, while on the H2 side the smallest
3765 * frame will be 9+X bytes based on the same buffer size. The HTTP/2 frame
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003766 * parser state is automatically updated. Returns > 0 if it could completely
3767 * send the current frame, 0 if it couldn't complete, in which case
3768 * CS_FL_RCV_MORE must be checked to know if some data remain pending (an empty
3769 * DATA frame can return 0 as a valid result). Stream errors are reported in
3770 * h2s->errcode and connection errors in h2c->errcode. The caller must already
3771 * have checked the frame header and ensured that the frame was complete or the
3772 * buffer full. It changes the frame state to FRAME_A once done.
Willy Tarreau454f9052017-10-26 19:40:35 +02003773 */
Willy Tarreau454b57b2018-02-26 15:50:05 +01003774static int h2_frt_transfer_data(struct h2s *h2s)
Willy Tarreau454f9052017-10-26 19:40:35 +02003775{
3776 struct h2c *h2c = h2s->h2c;
3777 int block1, block2;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003778 unsigned int flen = 0;
Willy Tarreaueba10f22018-04-25 20:44:22 +02003779 unsigned int chklen = 0;
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003780 struct htx *htx = NULL;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003781 struct buffer *csbuf;
Willy Tarreau454f9052017-10-26 19:40:35 +02003782
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003783 h2c->flags &= ~H2_CF_DEM_SFULL;
Willy Tarreau454f9052017-10-26 19:40:35 +02003784
Olivier Houchard638b7992018-08-16 15:41:52 +02003785 csbuf = h2_get_buf(h2c, &h2s->rxbuf);
Willy Tarreaud755ea62018-02-26 15:44:54 +01003786 if (!csbuf) {
3787 h2c->flags |= H2_CF_DEM_SALLOC;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003788 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003789 }
3790
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003791try_again:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003792 flen = h2c->dfl - h2c->dpl;
Olivier Houchard2f308832018-12-19 15:53:53 +01003793 if (h2c->proxy->options2 & PR_O2_USE_HTX)
3794 htx = htx_from_buf(csbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003795 if (!flen)
Willy Tarreau4a28da12018-01-04 14:41:00 +01003796 goto end_transfer;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003797
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003798 if (flen > b_data(&h2c->dbuf)) {
3799 flen = b_data(&h2c->dbuf);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003800 if (!flen)
Willy Tarreau454b57b2018-02-26 15:50:05 +01003801 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003802 }
3803
Willy Tarreaua9b77962019-01-31 07:23:00 +01003804 if (htx) {
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003805 block1 = htx_free_data_space(htx);
3806 if (!block1) {
3807 h2c->flags |= H2_CF_DEM_SFULL;
3808 goto fail;
3809 }
3810 if (flen > block1)
3811 flen = block1;
3812
3813 /* here, flen is the max we can copy into the output buffer */
3814 block1 = b_contig_data(&h2c->dbuf, 0);
3815 if (flen > block1)
3816 flen = block1;
3817
3818 if (!htx_add_data(htx, ist2(b_head(&h2c->dbuf), flen))) {
3819 h2c->flags |= H2_CF_DEM_SFULL;
3820 goto fail;
3821 }
3822
3823 b_del(&h2c->dbuf, flen);
3824 h2c->dfl -= flen;
3825 h2c->rcvd_c += flen;
3826 h2c->rcvd_s += flen; // warning, this can also affect the closed streams!
Willy Tarreau1915ca22019-01-24 11:49:37 +01003827
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003828 if (h2s->flags & H2_SF_DATA_CLEN) {
Willy Tarreau1915ca22019-01-24 11:49:37 +01003829 h2s->body_len -= flen;
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01003830 htx->extra = h2s->body_len;
3831 }
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003832 goto try_again;
3833 }
Willy Tarreau455d5682019-05-24 19:42:18 +02003834 else if (unlikely(b_space_wraps(csbuf) &&
3835 flen + chklen <= b_room(csbuf) &&
3836 b_data(csbuf) <= MAX_DATA_REALIGN)) {
3837 /* it doesn't fit in a single block and the buffer is fragmented, if there are
3838 * not too many data in the buffer, let's defragment it and try
3839 * again.
Willy Tarreaud755ea62018-02-26 15:44:54 +01003840 */
3841 b_slow_realign(csbuf, trash.area, 0);
Willy Tarreau454f9052017-10-26 19:40:35 +02003842 }
3843
Willy Tarreaueba10f22018-04-25 20:44:22 +02003844 /* chunked-encoding requires more room */
3845 if (h2s->flags & H2_SF_DATA_CHNK) {
Willy Tarreaud755ea62018-02-26 15:44:54 +01003846 chklen = MIN(flen, b_room(csbuf));
Willy Tarreaueba10f22018-04-25 20:44:22 +02003847 chklen = (chklen < 16) ? 1 : (chklen < 256) ? 2 :
3848 (chklen < 4096) ? 3 : (chklen < 65536) ? 4 :
3849 (chklen < 1048576) ? 4 : 8;
3850 chklen += 4; // CRLF, CRLF
3851 }
3852
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003853 /* does it fit in output buffer or should we wait ? */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003854 if (flen + chklen > b_room(csbuf)) {
3855 if (chklen >= b_room(csbuf)) {
3856 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003857 goto fail;
Willy Tarreaud755ea62018-02-26 15:44:54 +01003858 }
3859 flen = b_room(csbuf) - chklen;
Willy Tarreaueba10f22018-04-25 20:44:22 +02003860 }
3861
3862 if (h2s->flags & H2_SF_DATA_CHNK) {
3863 /* emit the chunk size */
3864 unsigned int chksz = flen;
3865 char str[10];
3866 char *beg;
3867
3868 beg = str + sizeof(str);
3869 *--beg = '\n';
3870 *--beg = '\r';
3871 do {
3872 *--beg = hextab[chksz & 0xF];
3873 } while (chksz >>= 4);
Willy Tarreaud755ea62018-02-26 15:44:54 +01003874 b_putblk(csbuf, beg, str + sizeof(str) - beg);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003875 }
3876
Willy Tarreau454f9052017-10-26 19:40:35 +02003877 /* Block1 is the length of the first block before the buffer wraps,
3878 * block2 is the optional second block to reach the end of the frame.
3879 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003880 block1 = b_contig_data(&h2c->dbuf, 0);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003881 if (block1 > flen)
3882 block1 = flen;
Willy Tarreau454f9052017-10-26 19:40:35 +02003883 block2 = flen - block1;
3884
3885 if (block1)
Willy Tarreaud755ea62018-02-26 15:44:54 +01003886 b_putblk(csbuf, b_head(&h2c->dbuf), block1);
Willy Tarreau454f9052017-10-26 19:40:35 +02003887
3888 if (block2)
Willy Tarreaud755ea62018-02-26 15:44:54 +01003889 b_putblk(csbuf, b_peek(&h2c->dbuf, block1), block2);
Willy Tarreau454f9052017-10-26 19:40:35 +02003890
Willy Tarreaueba10f22018-04-25 20:44:22 +02003891 if (h2s->flags & H2_SF_DATA_CHNK) {
3892 /* emit the CRLF */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003893 b_putblk(csbuf, "\r\n", 2);
Willy Tarreaueba10f22018-04-25 20:44:22 +02003894 }
3895
Willy Tarreau454f9052017-10-26 19:40:35 +02003896 /* now mark the input data as consumed (will be deleted from the buffer
3897 * by the caller when seeing FRAME_A after sending the window update).
3898 */
Willy Tarreauc9fa0482018-07-10 17:43:27 +02003899 b_del(&h2c->dbuf, flen);
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003900 h2c->dfl -= flen;
3901 h2c->rcvd_c += flen;
3902 h2c->rcvd_s += flen; // warning, this can also affect the closed streams!
3903
Willy Tarreau1915ca22019-01-24 11:49:37 +01003904 if (h2s->flags & H2_SF_DATA_CLEN)
3905 h2s->body_len -= flen;
3906
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003907 if (h2c->dfl > h2c->dpl) {
3908 /* more data available, transfer stalled on stream full */
Willy Tarreaud755ea62018-02-26 15:44:54 +01003909 h2c->flags |= H2_CF_DEM_SFULL;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003910 goto fail;
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003911 }
3912
Willy Tarreau4a28da12018-01-04 14:41:00 +01003913 end_transfer:
Willy Tarreau8fc016d2017-12-11 18:27:15 +01003914 /* here we're done with the frame, all the payload (except padding) was
3915 * transferred.
3916 */
Willy Tarreaueba10f22018-04-25 20:44:22 +02003917
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003918 if (h2c->dff & H2_F_DATA_END_STREAM) {
3919 if (htx) {
3920 if (!htx_add_endof(htx, HTX_BLK_EOM)) {
3921 h2c->flags |= H2_CF_DEM_SFULL;
3922 goto fail;
3923 }
Willy Tarreaud755ea62018-02-26 15:44:54 +01003924 }
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003925 else if (h2s->flags & H2_SF_DATA_CHNK) {
3926 /* emit the trailing 0 CRLF CRLF */
3927 if (b_room(csbuf) < 5) {
3928 h2c->flags |= H2_CF_DEM_SFULL;
3929 goto fail;
3930 }
3931 chklen += 5;
3932 b_putblk(csbuf, "0\r\n\r\n", 5);
3933 }
Willy Tarreaueba10f22018-04-25 20:44:22 +02003934 }
3935
Willy Tarreaud1023bb2018-03-22 16:53:12 +01003936 h2c->rcvd_c += h2c->dpl;
3937 h2c->rcvd_s += h2c->dpl;
3938 h2c->dpl = 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02003939 h2c->st0 = H2_CS_FRAME_A; // send the corresponding window update
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01003940 if (htx)
3941 htx_to_buf(htx, csbuf);
Willy Tarreau61ea7dc2018-12-01 23:23:04 +01003942 return 1;
Willy Tarreau454b57b2018-02-26 15:50:05 +01003943 fail:
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01003944 if (htx)
3945 htx_to_buf(htx, csbuf);
Willy Tarreau454b57b2018-02-26 15:50:05 +01003946 return 0;
Willy Tarreau454f9052017-10-26 19:40:35 +02003947}
3948
Willy Tarreau5dd17352018-06-14 13:33:30 +02003949/* Try to send a HEADERS frame matching HTTP/1 response present at offset <ofs>
3950 * and for <max> bytes in buffer <buf> for the H2 stream <h2s>. Returns the
3951 * number of bytes sent. The caller must check the stream's status to detect
3952 * any error which might have happened subsequently to a successful send.
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02003953 */
Willy Tarreau206ba832018-06-14 15:27:31 +02003954static 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 +02003955{
3956 struct http_hdr list[MAX_HTTP_HDR];
3957 struct h2c *h2c = h2s->h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +02003958 struct h1m *h1m = &h2s->h1m;
Willy Tarreau83061a82018-07-13 11:56:34 +02003959 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02003960 struct buffer *mbuf;
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02003961 union h1_sl sl;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02003962 int es_now = 0;
3963 int ret = 0;
3964 int hdr;
3965
3966 if (h2c_mux_busy(h2c, h2s)) {
3967 h2s->flags |= H2_SF_BLK_MBUSY;
3968 return 0;
3969 }
3970
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02003971 /* First, try to parse the H1 response and index it into <list>.
3972 * NOTE! Since it comes from haproxy, we *know* that a response header
3973 * block does not wrap and we can safely read it this way without
3974 * having to realign the buffer.
3975 */
Willy Tarreau5dd17352018-06-14 13:33:30 +02003976 ret = h1_headers_to_hdr_list(b_peek(buf, ofs), b_peek(buf, ofs) + max,
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02003977 list, sizeof(list)/sizeof(list[0]), h1m, &sl);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02003978 if (ret <= 0) {
Willy Tarreauf13ef962017-11-02 15:14:19 +01003979 /* incomplete or invalid response, this is abnormal coming from
3980 * haproxy and may only result in a bad errorfile or bad Lua code
3981 * so that won't be fixed, raise an error now.
3982 *
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02003983 * FIXME: we should instead add the ability to only return a
3984 * 502 bad gateway. But in theory this is not supposed to
3985 * happen.
3986 */
3987 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
3988 ret = 0;
3989 goto end;
3990 }
3991
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02003992 h2s->status = sl.st.status;
Willy Tarreaudb72da02018-09-13 11:52:20 +02003993
3994 /* certain statuses have no body or an empty one, regardless of
3995 * what the headers say.
3996 */
3997 if (sl.st.status >= 100 && sl.st.status < 200) {
3998 h1m->flags &= ~(H1_MF_CLEN | H1_MF_CHNK);
3999 h1m->curr_len = h1m->body_len = 0;
4000 }
4001 else if (sl.st.status == 204 || sl.st.status == 304) {
4002 /* no contents, claim c-len is present and set to zero */
4003 h1m->flags &= ~H1_MF_CHNK;
4004 h1m->flags |= H1_MF_CLEN;
4005 h1m->curr_len = h1m->body_len = 0;
4006 }
4007
Willy Tarreaubcc45952019-05-26 10:05:50 +02004008 mbuf = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02004009 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004010 if (!h2_get_buf(h2c, mbuf)) {
4011 h2c->flags |= H2_CF_MUX_MALLOC;
4012 h2s->flags |= H2_SF_BLK_MROOM;
4013 return 0;
4014 }
4015
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004016 chunk_reset(&outbuf);
4017
4018 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004019 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4020 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004021 break;
4022 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004023 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004024 }
4025
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004026 if (outbuf.size < 9)
4027 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004028
4029 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004030 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4031 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4032 outbuf.data = 9;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004033
4034 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004035 if (unlikely(list[0].v.len != 3)) {
Willy Tarreaua87f2022017-11-09 11:23:00 +01004036 /* this is an unparsable response */
4037 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4038 ret = 0;
4039 goto end;
4040 }
Willy Tarreauaafdf582018-12-10 18:06:40 +01004041
4042 if (!hpack_encode_str_status(&outbuf, h2s->status, list[0].v)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004043 if (b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004044 goto realign_again;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004045 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004046 }
4047
4048 /* encode all headers, stop at empty name */
4049 for (hdr = 1; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
Willy Tarreaua76e4c22017-11-24 08:17:28 +01004050 /* these ones do not exist in H2 and must be dropped. */
4051 if (isteq(list[hdr].n, ist("connection")) ||
4052 isteq(list[hdr].n, ist("proxy-connection")) ||
4053 isteq(list[hdr].n, ist("keep-alive")) ||
4054 isteq(list[hdr].n, ist("upgrade")) ||
4055 isteq(list[hdr].n, ist("transfer-encoding")))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004056 continue;
4057
4058 if (isteq(list[hdr].n, ist("")))
4059 break; // end
4060
4061 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4062 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004063 if (b_space_wraps(mbuf))
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004064 goto realign_again;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004065 goto full;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004066 }
4067 }
4068
4069 /* we may need to add END_STREAM */
Willy Tarreau927b88b2019-03-04 08:03:25 +01004070 if (((h1m->flags & H1_MF_CLEN) && !h1m->body_len) || !h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004071 es_now = 1;
4072
4073 /* update the frame's size */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004074 h2_set_frame_size(outbuf.area, outbuf.data - 9);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004075
4076 if (es_now)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004077 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004078
4079 /* consume incoming H1 response */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004080 max -= ret;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004081
4082 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004083 b_add(mbuf, outbuf.data);
Willy Tarreau67434202017-11-06 20:20:51 +01004084 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004085
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004086 if (es_now) {
Willy Tarreau35a62702018-02-27 15:37:25 +01004087 // trim any possibly pending data (eg: inconsistent content-length)
Willy Tarreau5dd17352018-06-14 13:33:30 +02004088 ret += max;
Willy Tarreau35a62702018-02-27 15:37:25 +01004089
Willy Tarreau801250e2018-09-11 11:45:04 +02004090 h1m->state = H1_MSG_DONE;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004091 h2s->flags |= H2_SF_ES_SENT;
4092 if (h2s->st == H2_SS_OPEN)
4093 h2s->st = H2_SS_HLOC;
4094 else
Willy Tarreau00dd0782018-03-01 16:31:34 +01004095 h2s_close(h2s);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004096 }
Willy Tarreau9c5e22e2018-09-11 19:22:14 +02004097 else if (h2s->status >= 100 && h2s->status < 200) {
Willy Tarreau87285592017-11-29 15:41:32 +01004098 /* we'll let the caller check if it has more headers to send */
Willy Tarreau7f437ff2018-09-11 13:51:19 +02004099 h1m_init_res(h1m);
Willy Tarreau9b8cd1f2018-09-12 09:24:38 +02004100 h1m->err_pos = -1; // don't care about errors on the response path
Willy Tarreaueb528db2018-09-12 09:54:00 +02004101 h2s->h1m.flags |= H1_MF_TOLOWER;
Willy Tarreau87285592017-11-29 15:41:32 +01004102 goto end;
Willy Tarreauc199faf2017-10-31 08:35:27 +01004103 }
Willy Tarreau001823c2018-09-12 17:25:32 +02004104
4105 /* now the h1m state is either H1_MSG_CHUNK_SIZE or H1_MSG_DATA */
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004106
4107 end:
Dirkjan Bussinkc26c72d2018-09-14 14:30:25 +02004108 //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 +02004109 return ret;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004110 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004111 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4112 goto retry;
Willy Tarreaub5b7d4a2018-09-12 18:51:18 +02004113 h1m_init_res(h1m);
4114 h1m->err_pos = -1; // don't care about errors on the response path
4115 h2c->flags |= H2_CF_MUX_MFULL;
4116 h2s->flags |= H2_SF_BLK_MROOM;
4117 ret = 0;
4118 goto end;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02004119}
4120
Willy Tarreau5dd17352018-06-14 13:33:30 +02004121/* Try to send a DATA frame matching HTTP/1 response present at offset <ofs>
4122 * for up to <max> bytes in response buffer <buf>, for stream <h2s>. Returns
4123 * the number of bytes sent. The caller must check the stream's status to
4124 * detect any error which might have happened subsequently to a successful send.
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004125 */
Willy Tarreau206ba832018-06-14 15:27:31 +02004126static 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 +02004127{
4128 struct h2c *h2c = h2s->h2c;
Willy Tarreaua40704a2018-09-11 13:52:04 +02004129 struct h1m *h1m = &h2s->h1m;
Willy Tarreau83061a82018-07-13 11:56:34 +02004130 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004131 struct buffer *mbuf;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004132 int ret = 0;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02004133 size_t total = 0;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004134 int es_now = 0;
4135 int size = 0;
Willy Tarreau206ba832018-06-14 15:27:31 +02004136 const char *blk1, *blk2;
Willy Tarreau55f3ce12018-07-18 11:49:27 +02004137 size_t len1, len2;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004138
4139 if (h2c_mux_busy(h2c, h2s)) {
4140 h2s->flags |= H2_SF_BLK_MBUSY;
4141 goto end;
4142 }
4143
Willy Tarreaubcc45952019-05-26 10:05:50 +02004144 mbuf = br_tail(h2c->mbuf);
Willy Tarreau9c218e72019-05-26 10:08:28 +02004145 retry:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004146 if (!h2_get_buf(h2c, mbuf)) {
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004147 h2c->flags |= H2_CF_MUX_MALLOC;
4148 h2s->flags |= H2_SF_BLK_MROOM;
4149 goto end;
4150 }
4151
4152 new_frame:
Willy Tarreau5dd17352018-06-14 13:33:30 +02004153 if (!max)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004154 goto end;
4155
4156 chunk_reset(&outbuf);
4157
4158 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004159 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4160 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004161 break;
4162 realign_again:
Willy Tarreau06ae84a2018-12-12 09:17:21 +01004163 /* If there are pending data in the output buffer, and we have
4164 * less than 1/4 of the mbuf's size and everything fits, we'll
4165 * still perform a copy anyway. Otherwise we'll pretend the mbuf
4166 * is full and wait, to save some slow realign calls.
4167 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004168 if ((max + 9 > b_room(mbuf) || max >= b_size(mbuf) / 4)) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004169 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4170 goto retry;
Willy Tarreau06ae84a2018-12-12 09:17:21 +01004171 h2c->flags |= H2_CF_MUX_MFULL;
4172 h2s->flags |= H2_SF_BLK_MROOM;
4173 goto end;
4174 }
4175
Willy Tarreaubcc45952019-05-26 10:05:50 +02004176 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004177 }
4178
4179 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004180 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4181 goto retry;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004182 h2c->flags |= H2_CF_MUX_MFULL;
4183 h2s->flags |= H2_SF_BLK_MROOM;
4184 goto end;
4185 }
4186
4187 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004188 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
4189 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4190 outbuf.data = 9;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004191
4192 switch (h1m->flags & (H1_MF_CLEN|H1_MF_CHNK)) {
4193 case 0: /* no content length, read till SHUTW */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004194 size = max;
Willy Tarreau13e4e942017-12-14 10:55:21 +01004195 h1m->curr_len = size;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004196 break;
4197 case H1_MF_CLEN: /* content-length: read only h2m->body_len */
Willy Tarreau5dd17352018-06-14 13:33:30 +02004198 size = max;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004199 if ((long long)size > h1m->curr_len)
4200 size = h1m->curr_len;
4201 break;
4202 default: /* te:chunked : parse chunks */
Willy Tarreau801250e2018-09-11 11:45:04 +02004203 if (h1m->state == H1_MSG_CHUNK_CRLF) {
Willy Tarreauc0973c62018-06-14 15:53:21 +02004204 ret = h1_skip_chunk_crlf(buf, ofs, ofs + max);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004205 if (!ret)
4206 goto end;
4207
4208 if (ret < 0) {
4209 /* FIXME: bad contents. how to proceed here when we're in H2 ? */
Willy Tarreau25173a72018-09-12 09:05:16 +02004210 h1m->err_pos = ofs + max + ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004211 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4212 goto end;
4213 }
Willy Tarreau5dd17352018-06-14 13:33:30 +02004214 max -= ret;
4215 ofs += ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004216 total += ret;
Willy Tarreau801250e2018-09-11 11:45:04 +02004217 h1m->state = H1_MSG_CHUNK_SIZE;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004218 }
4219
Willy Tarreau801250e2018-09-11 11:45:04 +02004220 if (h1m->state == H1_MSG_CHUNK_SIZE) {
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004221 unsigned int chunk;
Willy Tarreau84d6b7a2018-06-14 15:59:05 +02004222 ret = h1_parse_chunk_size(buf, ofs, ofs + max, &chunk);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004223 if (!ret)
4224 goto end;
4225
4226 if (ret < 0) {
4227 /* FIXME: bad contents. how to proceed here when we're in H2 ? */
Willy Tarreau25173a72018-09-12 09:05:16 +02004228 h1m->err_pos = ofs + max + ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004229 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4230 goto end;
4231 }
4232
4233 size = chunk;
4234 h1m->curr_len = chunk;
4235 h1m->body_len += chunk;
Willy Tarreau5dd17352018-06-14 13:33:30 +02004236 max -= ret;
4237 ofs += ret;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004238 total += ret;
Willy Tarreau801250e2018-09-11 11:45:04 +02004239 h1m->state = size ? H1_MSG_DATA : H1_MSG_TRAILERS;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004240 if (!size)
4241 goto send_empty;
4242 }
4243
4244 /* in MSG_DATA state, continue below */
4245 size = h1m->curr_len;
4246 break;
4247 }
4248
4249 /* we have in <size> the exact number of bytes we need to copy from
4250 * the H1 buffer. We need to check this against the connection's and
4251 * the stream's send windows, and to ensure that this fits in the max
4252 * frame size and in the buffer's available space minus 9 bytes (for
4253 * the frame header). The connection's flow control is applied last so
4254 * that we can use a separate list of streams which are immediately
4255 * unblocked on window opening. Note: we don't implement padding.
4256 */
4257
Willy Tarreau5dd17352018-06-14 13:33:30 +02004258 if (size > max)
4259 size = max;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004260
4261 if (size > h2s->mws)
4262 size = h2s->mws;
4263
4264 if (size <= 0) {
4265 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02004266 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02004267 LIST_DEL_INIT(&h2s->list);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004268 goto end;
4269 }
4270
4271 if (h2c->mfs && size > h2c->mfs)
4272 size = h2c->mfs;
4273
4274 if (size + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02004275 /* It doesn't fit at once. If it at least fits once split and
4276 * the amount of data to move is low, let's defragment the
4277 * buffer now.
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004278 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004279 if (b_space_wraps(mbuf) &&
4280 (size + 9 <= b_room(mbuf)) &&
4281 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004282 goto realign_again;
4283 size = outbuf.size - 9;
4284 }
4285
4286 if (size <= 0) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004287 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4288 goto retry;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004289 h2c->flags |= H2_CF_MUX_MFULL;
4290 h2s->flags |= H2_SF_BLK_MROOM;
4291 goto end;
4292 }
4293
4294 if (size > h2c->mws)
4295 size = h2c->mws;
4296
4297 if (size <= 0) {
4298 h2s->flags |= H2_SF_BLK_MFCTL;
4299 goto end;
4300 }
4301
4302 /* copy whatever we can */
4303 blk1 = blk2 = NULL; // silence a maybe-uninitialized warning
Willy Tarreau5dd17352018-06-14 13:33:30 +02004304 ret = b_getblk_nc(buf, &blk1, &len1, &blk2, &len2, ofs, max);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004305 if (ret == 1)
4306 len2 = 0;
4307
4308 if (!ret || len1 + len2 < size) {
4309 /* FIXME: must normally never happen */
4310 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4311 goto end;
4312 }
4313
4314 /* limit len1/len2 to size */
4315 if (len1 + len2 > size) {
4316 int sub = len1 + len2 - size;
4317
4318 if (len2 > sub)
4319 len2 -= sub;
4320 else {
4321 sub -= len2;
4322 len2 = 0;
4323 len1 -= sub;
4324 }
4325 }
4326
4327 /* now let's copy this this into the output buffer */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004328 memcpy(outbuf.area + 9, blk1, len1);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004329 if (len2)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004330 memcpy(outbuf.area + 9 + len1, blk2, len2);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004331
4332 send_empty:
4333 /* we may need to add END_STREAM */
4334 /* FIXME: we should also detect shutdown(w) below, but how ? Maybe we
4335 * could rely on the MSG_MORE flag as a hint for this ?
Willy Tarreau00610962018-07-19 10:58:28 +02004336 *
4337 * FIXME: what we do here is not correct because we send end_stream
4338 * before knowing if we'll have to send a HEADERS frame for the
4339 * trailers. More importantly we're not consuming the trailing CRLF
4340 * after the end of trailers, so it will be left to the caller to
4341 * eat it. The right way to do it would be to measure trailers here
4342 * and to send ES only if there are no trailers.
4343 *
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004344 */
4345 if (((h1m->flags & H1_MF_CLEN) && !(h1m->curr_len - size)) ||
Willy Tarreau801250e2018-09-11 11:45:04 +02004346 !h1m->curr_len || h1m->state >= H1_MSG_DONE)
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004347 es_now = 1;
4348
4349 /* update the frame's size */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004350 h2_set_frame_size(outbuf.area, size);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004351
4352 if (es_now)
Willy Tarreau843b7cb2018-07-13 10:54:26 +02004353 outbuf.area[4] |= H2_F_DATA_END_STREAM;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004354
4355 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004356 b_add(mbuf, size + 9);
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004357
4358 /* consume incoming H1 response */
4359 if (size > 0) {
Willy Tarreau5dd17352018-06-14 13:33:30 +02004360 max -= size;
4361 ofs += size;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004362 total += size;
4363 h1m->curr_len -= size;
4364 h2s->mws -= size;
4365 h2c->mws -= size;
4366
4367 if (size && !h1m->curr_len && (h1m->flags & H1_MF_CHNK)) {
Willy Tarreau801250e2018-09-11 11:45:04 +02004368 h1m->state = H1_MSG_CHUNK_CRLF;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004369 goto new_frame;
4370 }
4371 }
4372
4373 if (es_now) {
4374 if (h2s->st == H2_SS_OPEN)
4375 h2s->st = H2_SS_HLOC;
4376 else
Willy Tarreau00dd0782018-03-01 16:31:34 +01004377 h2s_close(h2s);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01004378
Willy Tarreau35a62702018-02-27 15:37:25 +01004379 if (!(h1m->flags & H1_MF_CHNK)) {
4380 // trim any possibly pending data (eg: inconsistent content-length)
Willy Tarreau5dd17352018-06-14 13:33:30 +02004381 total += max;
4382 ofs += max;
4383 max = 0;
Willy Tarreau35a62702018-02-27 15:37:25 +01004384
Willy Tarreau801250e2018-09-11 11:45:04 +02004385 h1m->state = H1_MSG_DONE;
Willy Tarreau35a62702018-02-27 15:37:25 +01004386 }
Willy Tarreau9d89ac82017-10-31 17:15:59 +01004387
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004388 h2s->flags |= H2_SF_ES_SENT;
4389 }
4390
4391 end:
Dirkjan Bussinkc26c72d2018-09-14 14:30:25 +02004392 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, (unsigned int)b_data(buf));
Willy Tarreauc652dbd2017-10-19 11:16:37 +02004393 return total;
4394}
4395
Willy Tarreau115e83b2018-12-01 19:17:53 +01004396/* Try to send a HEADERS frame matching HTX response present in HTX message
4397 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4398 * must check the stream's status to detect any error which might have happened
4399 * subsequently to a successful send. The htx blocks are automatically removed
4400 * from the message. The htx message is assumed to be valid since produced from
4401 * the internal code, hence it contains a start line, an optional series of
4402 * header blocks and an end of header, otherwise an invalid frame could be
4403 * emitted and the resulting htx message could be left in an inconsistent state.
4404 */
4405static size_t h2s_htx_frt_make_resp_headers(struct h2s *h2s, struct htx *htx)
4406{
4407 struct http_hdr list[MAX_HTTP_HDR];
4408 struct h2c *h2c = h2s->h2c;
4409 struct htx_blk *blk;
4410 struct htx_blk *blk_end;
4411 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004412 struct buffer *mbuf;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004413 struct htx_sl *sl;
4414 enum htx_blk_type type;
4415 int es_now = 0;
4416 int ret = 0;
4417 int hdr;
4418 int idx;
4419
4420 if (h2c_mux_busy(h2c, h2s)) {
4421 h2s->flags |= H2_SF_BLK_MBUSY;
4422 return 0;
4423 }
4424
Willy Tarreau115e83b2018-12-01 19:17:53 +01004425 /* determine the first block which must not be deleted, blk_end may
4426 * be NULL if all blocks have to be deleted.
4427 */
4428 idx = htx_get_head(htx);
4429 blk_end = NULL;
4430 while (idx != -1) {
4431 type = htx_get_blk_type(htx_get_blk(htx, idx));
4432 idx = htx_get_next(htx, idx);
4433 if (type == HTX_BLK_EOH) {
4434 if (idx != -1)
4435 blk_end = htx_get_blk(htx, idx);
4436 break;
4437 }
4438 }
4439
4440 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004441 blk = htx_get_head_blk(htx);
4442 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_RES_SL);
4443 ALREADY_CHECKED(blk);
4444 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004445 h2s->status = sl->info.res.status;
Willy Tarreauaafdf582018-12-10 18:06:40 +01004446 if (h2s->status < 100 || h2s->status > 999)
4447 goto fail;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004448
4449 /* and the rest of the headers, that we dump starting at header 0 */
4450 hdr = 0;
4451
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004452 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau115e83b2018-12-01 19:17:53 +01004453 while ((idx = htx_get_next(htx, idx)) != -1) {
4454 blk = htx_get_blk(htx, idx);
4455 type = htx_get_blk_type(blk);
4456
4457 if (type == HTX_BLK_UNUSED)
4458 continue;
4459
4460 if (type != HTX_BLK_HDR)
4461 break;
4462
4463 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
4464 goto fail;
4465
4466 list[hdr].n = htx_get_blk_name(htx, blk);
4467 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau115e83b2018-12-01 19:17:53 +01004468 hdr++;
4469 }
4470
4471 /* marker for end of headers */
4472 list[hdr].n = ist("");
4473
4474 if (h2s->status == 204 || h2s->status == 304) {
4475 /* no contents, claim c-len is present and set to zero */
4476 es_now = 1;
4477 }
4478
Willy Tarreau9c218e72019-05-26 10:08:28 +02004479 mbuf = br_tail(h2c->mbuf);
4480 retry:
4481 if (!h2_get_buf(h2c, mbuf)) {
4482 h2c->flags |= H2_CF_MUX_MALLOC;
4483 h2s->flags |= H2_SF_BLK_MROOM;
4484 return 0;
4485 }
4486
Willy Tarreau115e83b2018-12-01 19:17:53 +01004487 chunk_reset(&outbuf);
4488
4489 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004490 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4491 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004492 break;
4493 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004494 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau115e83b2018-12-01 19:17:53 +01004495 }
4496
4497 if (outbuf.size < 9)
4498 goto full;
4499
4500 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4501 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4502 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4503 outbuf.data = 9;
4504
4505 /* encode status, which necessarily is the first one */
Willy Tarreauaafdf582018-12-10 18:06:40 +01004506 if (!hpack_encode_int_status(&outbuf, h2s->status)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004507 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004508 goto realign_again;
4509 goto full;
4510 }
4511
4512 /* encode all headers, stop at empty name */
4513 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4514 /* these ones do not exist in H2 and must be dropped. */
4515 if (isteq(list[hdr].n, ist("connection")) ||
4516 isteq(list[hdr].n, ist("proxy-connection")) ||
4517 isteq(list[hdr].n, ist("keep-alive")) ||
4518 isteq(list[hdr].n, ist("upgrade")) ||
4519 isteq(list[hdr].n, ist("transfer-encoding")))
4520 continue;
4521
4522 if (isteq(list[hdr].n, ist("")))
4523 break; // end
4524
4525 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4526 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004527 if (b_space_wraps(mbuf))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004528 goto realign_again;
4529 goto full;
4530 }
4531 }
4532
Christopher Faulet0b465482019-02-19 15:14:23 +01004533 /* we may need to add END_STREAM except for 1xx responses.
Willy Tarreau115e83b2018-12-01 19:17:53 +01004534 * FIXME: we should also set it when we know for sure that the
4535 * content-length is zero as well as on 204/304
4536 */
Christopher Faulet0b465482019-02-19 15:14:23 +01004537 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM &&
4538 (h2s->status >= 200 || h2s->status == 101))
Willy Tarreau115e83b2018-12-01 19:17:53 +01004539 es_now = 1;
4540
Willy Tarreau927b88b2019-03-04 08:03:25 +01004541 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau115e83b2018-12-01 19:17:53 +01004542 es_now = 1;
4543
4544 /* update the frame's size */
4545 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4546
4547 if (es_now)
4548 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4549
4550 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004551 b_add(mbuf, outbuf.data);
Christopher Faulet0b465482019-02-19 15:14:23 +01004552
4553 /* indicates the HEADERS frame was sent, except for 1xx responses. For
4554 * 1xx responses, another HEADERS frame is expected.
4555 */
4556 if (h2s->status >= 200 || h2s->status == 101)
4557 h2s->flags |= H2_SF_HEADERS_SENT;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004558
Willy Tarreau115e83b2018-12-01 19:17:53 +01004559 if (es_now) {
4560 h2s->flags |= H2_SF_ES_SENT;
4561 if (h2s->st == H2_SS_OPEN)
4562 h2s->st = H2_SS_HLOC;
4563 else
4564 h2s_close(h2s);
4565 }
4566
4567 /* OK we could properly deliver the response */
4568
4569 /* remove all header blocks including the EOH and compute the
4570 * corresponding size.
4571 *
4572 * FIXME: We should remove everything when es_now is set.
4573 */
4574 ret = 0;
4575 idx = htx_get_head(htx);
4576 blk = htx_get_blk(htx, idx);
4577 while (blk != blk_end) {
4578 ret += htx_get_blksz(blk);
4579 blk = htx_remove_blk(htx, blk);
4580 }
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004581
Christopher Faulet316934d2019-05-15 14:22:48 +02004582 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4583 ret += htx_get_blksz(blk_end);
Willy Tarreauc5753ae2018-12-02 12:28:01 +01004584 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004585 }
Willy Tarreau115e83b2018-12-01 19:17:53 +01004586 end:
4587 return ret;
4588 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004589 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4590 goto retry;
Willy Tarreau115e83b2018-12-01 19:17:53 +01004591 h2c->flags |= H2_CF_MUX_MFULL;
4592 h2s->flags |= H2_SF_BLK_MROOM;
4593 ret = 0;
4594 goto end;
4595 fail:
4596 /* unparsable HTX messages, too large ones to be produced in the local
4597 * list etc go here (unrecoverable errors).
4598 */
4599 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4600 ret = 0;
4601 goto end;
4602}
4603
Willy Tarreau80739692018-10-05 11:35:57 +02004604/* Try to send a HEADERS frame matching HTX request present in HTX message
4605 * <htx> for the H2 stream <h2s>. Returns the number of bytes sent. The caller
4606 * must check the stream's status to detect any error which might have happened
4607 * subsequently to a successful send. The htx blocks are automatically removed
4608 * from the message. The htx message is assumed to be valid since produced from
4609 * the internal code, hence it contains a start line, an optional series of
4610 * header blocks and an end of header, otherwise an invalid frame could be
4611 * emitted and the resulting htx message could be left in an inconsistent state.
4612 */
4613static size_t h2s_htx_bck_make_req_headers(struct h2s *h2s, struct htx *htx)
4614{
4615 struct http_hdr list[MAX_HTTP_HDR];
4616 struct h2c *h2c = h2s->h2c;
4617 struct htx_blk *blk;
4618 struct htx_blk *blk_end;
4619 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004620 struct buffer *mbuf;
Willy Tarreau80739692018-10-05 11:35:57 +02004621 struct htx_sl *sl;
Willy Tarreau053c1572019-02-01 16:13:59 +01004622 struct ist meth, path, auth;
Willy Tarreau80739692018-10-05 11:35:57 +02004623 enum htx_blk_type type;
4624 int es_now = 0;
4625 int ret = 0;
4626 int hdr;
4627 int idx;
4628
4629 if (h2c_mux_busy(h2c, h2s)) {
4630 h2s->flags |= H2_SF_BLK_MBUSY;
4631 return 0;
4632 }
4633
Willy Tarreau80739692018-10-05 11:35:57 +02004634 /* determine the first block which must not be deleted, blk_end may
4635 * be NULL if all blocks have to be deleted.
4636 */
4637 idx = htx_get_head(htx);
4638 blk_end = NULL;
4639 while (idx != -1) {
4640 type = htx_get_blk_type(htx_get_blk(htx, idx));
4641 idx = htx_get_next(htx, idx);
4642 if (type == HTX_BLK_EOH) {
4643 if (idx != -1)
4644 blk_end = htx_get_blk(htx, idx);
4645 break;
4646 }
4647 }
4648
4649 /* get the start line, we do have one */
Christopher Fauletb77a1d22019-05-13 11:55:10 +02004650 blk = htx_get_head_blk(htx);
4651 BUG_ON(htx_get_blk_type(blk) != HTX_BLK_REQ_SL);
4652 ALREADY_CHECKED(blk);
4653 sl = htx_get_blk_ptr(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004654 meth = htx_sl_req_meth(sl);
4655 path = htx_sl_req_uri(sl);
4656
4657 /* and the rest of the headers, that we dump starting at header 0 */
4658 hdr = 0;
4659
Willy Tarreau8e162ee2018-12-06 14:07:27 +01004660 idx = htx_get_head(htx); // returns the SL that we skip
Willy Tarreau80739692018-10-05 11:35:57 +02004661 while ((idx = htx_get_next(htx, idx)) != -1) {
4662 blk = htx_get_blk(htx, idx);
4663 type = htx_get_blk_type(blk);
4664
4665 if (type == HTX_BLK_UNUSED)
4666 continue;
4667
4668 if (type != HTX_BLK_HDR)
4669 break;
4670
4671 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
4672 goto fail;
4673
4674 list[hdr].n = htx_get_blk_name(htx, blk);
4675 list[hdr].v = htx_get_blk_value(htx, blk);
Willy Tarreau80739692018-10-05 11:35:57 +02004676 hdr++;
4677 }
4678
4679 /* marker for end of headers */
4680 list[hdr].n = ist("");
4681
Willy Tarreau9c218e72019-05-26 10:08:28 +02004682 mbuf = br_tail(h2c->mbuf);
4683 retry:
4684 if (!h2_get_buf(h2c, mbuf)) {
4685 h2c->flags |= H2_CF_MUX_MALLOC;
4686 h2s->flags |= H2_SF_BLK_MROOM;
4687 return 0;
4688 }
4689
Willy Tarreau80739692018-10-05 11:35:57 +02004690 chunk_reset(&outbuf);
4691
4692 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004693 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4694 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004695 break;
4696 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004697 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau80739692018-10-05 11:35:57 +02004698 }
4699
4700 if (outbuf.size < 9)
4701 goto full;
4702
4703 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4 */
4704 memcpy(outbuf.area, "\x00\x00\x00\x01\x04", 5);
4705 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4706 outbuf.data = 9;
4707
4708 /* encode the method, which necessarily is the first one */
Willy Tarreaubdabc3a2018-12-10 18:25:11 +01004709 if (!hpack_encode_method(&outbuf, sl->info.req.meth, meth)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004710 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004711 goto realign_again;
4712 goto full;
4713 }
4714
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004715 /* RFC7540 #8.3: the CONNECT method must have :
4716 * - :authority set to the URI part (host:port)
4717 * - :method set to CONNECT
4718 * - :scheme and :path omitted
4719 */
4720 if (sl->info.req.meth != HTTP_METH_CONNECT) {
4721 /* encode the scheme which is always "https" (or 0x86 for "http") */
4722 if (!hpack_encode_scheme(&outbuf, ist("https"))) {
4723 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004724 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004725 goto realign_again;
4726 goto full;
4727 }
Willy Tarreau80739692018-10-05 11:35:57 +02004728
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004729 /* encode the path, which necessarily is the second one */
4730 if (!hpack_encode_path(&outbuf, path)) {
4731 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004732 if (b_space_wraps(mbuf))
Willy Tarreau5be92ff2019-02-01 15:51:59 +01004733 goto realign_again;
4734 goto full;
4735 }
Willy Tarreau053c1572019-02-01 16:13:59 +01004736
4737 /* look for the Host header and place it in :authority */
4738 auth = ist2(NULL, 0);
4739 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4740 if (isteq(list[hdr].n, ist("")))
4741 break; // end
4742
4743 if (isteq(list[hdr].n, ist("host"))) {
4744 auth = list[hdr].v;
4745 break;
4746 }
4747 }
4748 }
4749 else {
4750 /* for CONNECT, :authority is taken from the path */
4751 auth = path;
4752 }
4753
4754 if (auth.ptr && !hpack_encode_header(&outbuf, ist(":authority"), auth)) {
4755 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004756 if (b_space_wraps(mbuf))
Willy Tarreau053c1572019-02-01 16:13:59 +01004757 goto realign_again;
4758 goto full;
Willy Tarreau80739692018-10-05 11:35:57 +02004759 }
4760
4761 /* encode all headers, stop at empty name */
4762 for (hdr = 0; hdr < sizeof(list)/sizeof(list[0]); hdr++) {
4763 /* these ones do not exist in H2 and must be dropped. */
4764 if (isteq(list[hdr].n, ist("connection")) ||
Willy Tarreau053c1572019-02-01 16:13:59 +01004765 isteq(list[hdr].n, ist("host")) ||
Willy Tarreau80739692018-10-05 11:35:57 +02004766 isteq(list[hdr].n, ist("proxy-connection")) ||
4767 isteq(list[hdr].n, ist("keep-alive")) ||
4768 isteq(list[hdr].n, ist("upgrade")) ||
4769 isteq(list[hdr].n, ist("transfer-encoding")))
4770 continue;
4771
4772 if (isteq(list[hdr].n, ist("")))
4773 break; // end
4774
4775 if (!hpack_encode_header(&outbuf, list[hdr].n, list[hdr].v)) {
4776 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004777 if (b_space_wraps(mbuf))
Willy Tarreau80739692018-10-05 11:35:57 +02004778 goto realign_again;
4779 goto full;
4780 }
4781 }
4782
4783 /* we may need to add END_STREAM if we have no body :
4784 * - request already closed, or :
4785 * - no transfer-encoding, and :
4786 * - no content-length or content-length:0
4787 * Fixme: this doesn't take into account CONNECT requests.
4788 */
4789 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM)
4790 es_now = 1;
4791
4792 if (sl->flags & HTX_SL_F_BODYLESS)
4793 es_now = 1;
4794
Willy Tarreau927b88b2019-03-04 08:03:25 +01004795 if (!h2s->cs || h2s->cs->flags & CS_FL_SHW)
Willy Tarreau80739692018-10-05 11:35:57 +02004796 es_now = 1;
4797
4798 /* update the frame's size */
4799 h2_set_frame_size(outbuf.area, outbuf.data - 9);
4800
4801 if (es_now)
4802 outbuf.area[4] |= H2_F_HEADERS_END_STREAM;
4803
4804 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004805 b_add(mbuf, outbuf.data);
Willy Tarreau80739692018-10-05 11:35:57 +02004806 h2s->flags |= H2_SF_HEADERS_SENT;
4807 h2s->st = H2_SS_OPEN;
4808
Willy Tarreau80739692018-10-05 11:35:57 +02004809 if (es_now) {
4810 // trim any possibly pending data (eg: inconsistent content-length)
4811 h2s->flags |= H2_SF_ES_SENT;
4812 h2s->st = H2_SS_HLOC;
4813 }
4814
4815 /* remove all header blocks including the EOH and compute the
4816 * corresponding size.
4817 *
4818 * FIXME: We should remove everything when es_now is set.
4819 */
4820 ret = 0;
4821 idx = htx_get_head(htx);
4822 blk = htx_get_blk(htx, idx);
4823 while (blk != blk_end) {
4824 ret += htx_get_blksz(blk);
4825 blk = htx_remove_blk(htx, blk);
4826 }
4827
Christopher Faulet316934d2019-05-15 14:22:48 +02004828 if (blk_end && htx_get_blk_type(blk_end) == HTX_BLK_EOM) {
4829 ret += htx_get_blksz(blk_end);
Willy Tarreau80739692018-10-05 11:35:57 +02004830 htx_remove_blk(htx, blk_end);
Christopher Faulet316934d2019-05-15 14:22:48 +02004831 }
Willy Tarreau80739692018-10-05 11:35:57 +02004832
4833 end:
4834 return ret;
4835 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02004836 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4837 goto retry;
Willy Tarreau80739692018-10-05 11:35:57 +02004838 h2c->flags |= H2_CF_MUX_MFULL;
4839 h2s->flags |= H2_SF_BLK_MROOM;
4840 ret = 0;
4841 goto end;
4842 fail:
4843 /* unparsable HTX messages, too large ones to be produced in the local
4844 * list etc go here (unrecoverable errors).
4845 */
4846 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
4847 ret = 0;
4848 goto end;
4849}
4850
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004851/* Try to send a DATA frame matching HTTP response present in HTX structure
Willy Tarreau98de12a2018-12-12 07:03:00 +01004852 * present in <buf>, for stream <h2s>. Returns the number of bytes sent. The
4853 * caller must check the stream's status to detect any error which might have
4854 * happened subsequently to a successful send. Returns the number of data bytes
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004855 * consumed, or zero if nothing done. Note that EOD/EOM count for 1 byte.
4856 */
Willy Tarreau98de12a2018-12-12 07:03:00 +01004857static size_t h2s_htx_frt_make_resp_data(struct h2s *h2s, struct buffer *buf, size_t count)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004858{
4859 struct h2c *h2c = h2s->h2c;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004860 struct htx *htx;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004861 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02004862 struct buffer *mbuf;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004863 size_t total = 0;
4864 int es_now = 0;
4865 int bsize; /* htx block size */
4866 int fsize; /* h2 frame size */
4867 struct htx_blk *blk;
4868 enum htx_blk_type type;
4869 int idx;
4870
4871 if (h2c_mux_busy(h2c, h2s)) {
4872 h2s->flags |= H2_SF_BLK_MBUSY;
4873 goto end;
4874 }
4875
Willy Tarreau98de12a2018-12-12 07:03:00 +01004876 htx = htx_from_buf(buf);
4877
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004878 /* We only come here with HTX_BLK_DATA or HTX_BLK_EOD blocks. However,
4879 * while looping, we can meet an HTX_BLK_EOM block that we'll leave to
4880 * the caller to handle.
4881 */
4882
4883 new_frame:
Willy Tarreauee573762018-12-04 15:25:57 +01004884 if (!count || htx_is_empty(htx))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004885 goto end;
4886
4887 idx = htx_get_head(htx);
4888 blk = htx_get_blk(htx, idx);
4889 type = htx_get_blk_type(blk); // DATA or EOD or EOM
4890 bsize = htx_get_blksz(blk);
4891 fsize = bsize;
4892
4893 if (type == HTX_BLK_EOD) {
4894 /* if we have an EOD, we're dealing with chunked data. We may
4895 * have a set of trailers after us that the caller will want to
4896 * deal with. Let's simply remove the EOD and return.
4897 */
4898 htx_remove_blk(htx, blk);
Willy Tarreauee573762018-12-04 15:25:57 +01004899 total++; // EOD counts as one byte
4900 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004901 goto end;
4902 }
Willy Tarreau7eeb10a2019-01-04 09:28:17 +01004903 else if (type == HTX_BLK_EOM) {
4904 if (h2s->flags & H2_SF_ES_SENT) {
4905 /* ES already sent */
4906 htx_remove_blk(htx, blk);
4907 total++; // EOM counts as one byte
4908 count--;
4909 goto end;
4910 }
4911 }
4912 else if (type != HTX_BLK_DATA)
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01004913 goto end;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004914
Willy Tarreau9c218e72019-05-26 10:08:28 +02004915 mbuf = br_tail(h2c->mbuf);
4916 retry:
4917 if (!h2_get_buf(h2c, mbuf)) {
4918 h2c->flags |= H2_CF_MUX_MALLOC;
4919 h2s->flags |= H2_SF_BLK_MROOM;
4920 goto end;
4921 }
4922
Willy Tarreau98de12a2018-12-12 07:03:00 +01004923 /* Perform some optimizations to reduce the number of buffer copies.
4924 * First, if the mux's buffer is empty and the htx area contains
4925 * exactly one data block of the same size as the requested count, and
4926 * this count fits within the frame size, the stream's window size, and
4927 * the connection's window size, then it's possible to simply swap the
4928 * caller's buffer with the mux's output buffer and adjust offsets and
4929 * length to match the entire DATA HTX block in the middle. In this
4930 * case we perform a true zero-copy operation from end-to-end. This is
4931 * the situation that happens all the time with large files. Second, if
4932 * this is not possible, but the mux's output buffer is empty, we still
4933 * have an opportunity to avoid the copy to the intermediary buffer, by
4934 * making the intermediary buffer's area point to the output buffer's
4935 * area. In this case we want to skip the HTX header to make sure that
4936 * copies remain aligned and that this operation remains possible all
4937 * the time. This goes for headers, data blocks and any data extracted
4938 * from the HTX blocks.
4939 */
4940 if (unlikely(fsize == count &&
4941 htx->used == 1 && type == HTX_BLK_DATA &&
4942 fsize <= h2s->mws && fsize <= h2c->mws && fsize <= h2c->mfs)) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004943 void *old_area = mbuf->area;
Willy Tarreau98de12a2018-12-12 07:03:00 +01004944
Willy Tarreaubcc45952019-05-26 10:05:50 +02004945 if (b_data(mbuf)) {
Willy Tarreau8ab128c2019-03-21 17:47:28 +01004946 /* Too bad there are data left there. We're willing to memcpy/memmove
4947 * up to 1/4 of the buffer, which means that it's OK to copy a large
4948 * frame into a buffer containing few data if it needs to be realigned,
4949 * and that it's also OK to copy few data without realigning. Otherwise
4950 * we'll pretend the mbuf is full and wait for it to become empty.
Willy Tarreau98de12a2018-12-12 07:03:00 +01004951 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004952 if (fsize + 9 <= b_room(mbuf) &&
4953 (b_data(mbuf) <= b_size(mbuf) / 4 ||
4954 (fsize <= b_size(mbuf) / 4 && fsize + 9 <= b_contig_space(mbuf))))
Willy Tarreau98de12a2018-12-12 07:03:00 +01004955 goto copy;
Willy Tarreau8ab128c2019-03-21 17:47:28 +01004956
Willy Tarreau9c218e72019-05-26 10:08:28 +02004957 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
4958 goto retry;
4959
Willy Tarreau98de12a2018-12-12 07:03:00 +01004960 h2c->flags |= H2_CF_MUX_MFULL;
4961 h2s->flags |= H2_SF_BLK_MROOM;
4962 goto end;
4963 }
4964
4965 /* map an H2 frame to the HTX block so that we can put the
4966 * frame header there.
4967 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02004968 *mbuf = b_make(buf->area, buf->size, sizeof(struct htx) + blk->addr - 9, fsize + 9);
4969 outbuf.area = b_head(mbuf);
Willy Tarreau98de12a2018-12-12 07:03:00 +01004970
4971 /* prepend an H2 DATA frame header just before the DATA block */
4972 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
4973 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
4974 h2_set_frame_size(outbuf.area, fsize);
4975
4976 /* update windows */
4977 h2s->mws -= fsize;
4978 h2c->mws -= fsize;
4979
4980 /* and exchange with our old area */
4981 buf->area = old_area;
4982 buf->data = buf->head = 0;
4983 total += fsize;
4984 goto end;
4985 }
Willy Tarreau2fb1d4c2018-12-04 15:28:03 +01004986
Willy Tarreau98de12a2018-12-12 07:03:00 +01004987 copy:
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004988 /* for DATA and EOM we'll have to emit a frame, even if empty */
4989
4990 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02004991 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
4992 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004993 break;
4994 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02004995 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau0c535fd2018-12-01 19:25:56 +01004996 }
4997
4998 if (outbuf.size < 9) {
Willy Tarreau9c218e72019-05-26 10:08:28 +02004999 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5000 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005001 h2c->flags |= H2_CF_MUX_MFULL;
5002 h2s->flags |= H2_SF_BLK_MROOM;
5003 goto end;
5004 }
5005
5006 /* len: 0x000000 (fill later), type: 0(DATA), flags: none=0 */
5007 memcpy(outbuf.area, "\x00\x00\x00\x00\x00", 5);
5008 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5009 outbuf.data = 9;
5010
5011 /* we have in <fsize> the exact number of bytes we need to copy from
5012 * the HTX buffer. We need to check this against the connection's and
5013 * the stream's send windows, and to ensure that this fits in the max
5014 * frame size and in the buffer's available space minus 9 bytes (for
5015 * the frame header). The connection's flow control is applied last so
5016 * that we can use a separate list of streams which are immediately
5017 * unblocked on window opening. Note: we don't implement padding.
5018 */
5019
5020 /* EOM is presented with bsize==1 but would lead to the emission of an
5021 * empty frame, thus we force it to zero here.
5022 */
5023 if (type == HTX_BLK_EOM)
5024 bsize = fsize = 0;
5025
5026 if (!fsize)
5027 goto send_empty;
5028
5029 if (h2s->mws <= 0) {
5030 h2s->flags |= H2_SF_BLK_SFCTL;
Willy Tarreauc234ae32019-05-13 17:56:11 +02005031 if (LIST_ADDED(&h2s->list))
Olivier Houchardbfe2a832019-05-10 14:02:21 +02005032 LIST_DEL_INIT(&h2s->list);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005033 goto end;
5034 }
5035
Willy Tarreauee573762018-12-04 15:25:57 +01005036 if (fsize > count)
5037 fsize = count;
5038
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005039 if (fsize > h2s->mws)
5040 fsize = h2s->mws; // >0
5041
5042 if (h2c->mfs && fsize > h2c->mfs)
5043 fsize = h2c->mfs; // >0
5044
5045 if (fsize + 9 > outbuf.size) {
Willy Tarreau455d5682019-05-24 19:42:18 +02005046 /* It doesn't fit at once. If it at least fits once split and
5047 * the amount of data to move is low, let's defragment the
5048 * buffer now.
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005049 */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005050 if (b_space_wraps(mbuf) &&
5051 (fsize + 9 <= b_room(mbuf)) &&
5052 b_data(mbuf) <= MAX_DATA_REALIGN)
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005053 goto realign_again;
5054 fsize = outbuf.size - 9;
5055
5056 if (fsize <= 0) {
5057 /* no need to send an empty frame here */
Willy Tarreau9c218e72019-05-26 10:08:28 +02005058 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5059 goto retry;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005060 h2c->flags |= H2_CF_MUX_MFULL;
5061 h2s->flags |= H2_SF_BLK_MROOM;
5062 goto end;
5063 }
5064 }
5065
5066 if (h2c->mws <= 0) {
5067 h2s->flags |= H2_SF_BLK_MFCTL;
5068 goto end;
5069 }
5070
5071 if (fsize > h2c->mws)
5072 fsize = h2c->mws;
5073
5074 /* now let's copy this this into the output buffer */
5075 memcpy(outbuf.area + 9, htx_get_blk_ptr(htx, blk), fsize);
Willy Tarreau0f799ca2018-12-04 15:20:11 +01005076 h2s->mws -= fsize;
5077 h2c->mws -= fsize;
Willy Tarreauee573762018-12-04 15:25:57 +01005078 count -= fsize;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005079
5080 send_empty:
5081 /* update the frame's size */
5082 h2_set_frame_size(outbuf.area, fsize);
5083
5084 /* FIXME: for now we only set the ES flag on empty DATA frames, once
5085 * meeting EOM. We should optimize this later.
5086 */
5087 if (type == HTX_BLK_EOM) {
Willy Tarreauee573762018-12-04 15:25:57 +01005088 total++; // EOM counts as one byte
5089 count--;
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005090 es_now = 1;
5091 }
5092
5093 if (es_now)
5094 outbuf.area[4] |= H2_F_DATA_END_STREAM;
5095
5096 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005097 b_add(mbuf, fsize + 9);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005098
5099 /* consume incoming HTX block, including EOM */
5100 total += fsize;
5101 if (fsize == bsize) {
5102 htx_remove_blk(htx, blk);
5103 if (fsize)
5104 goto new_frame;
5105 } else {
5106 /* we've truncated this block */
5107 htx_cut_data_blk(htx, blk, fsize);
5108 }
5109
5110 if (es_now) {
5111 if (h2s->st == H2_SS_OPEN)
5112 h2s->st = H2_SS_HLOC;
5113 else
5114 h2s_close(h2s);
5115
5116 h2s->flags |= H2_SF_ES_SENT;
5117 }
5118
5119 end:
5120 return total;
5121}
5122
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005123/* Try to send a HEADERS frame matching HTX_BLK_TLR series of blocks present in
5124 * HTX message <htx> for the H2 stream <h2s>. Returns the number of bytes
5125 * processed. The caller must check the stream's status to detect any error
5126 * which might have happened subsequently to a successful send. The htx blocks
5127 * are automatically removed from the message. The htx message is assumed to be
5128 * valid since produced from the internal code. Processing stops when meeting
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005129 * the EOM, which is *not* removed. All trailers are processed at once and sent
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005130 * as a single frame. The ES flag is always set.
5131 */
5132static size_t h2s_htx_make_trailers(struct h2s *h2s, struct htx *htx)
5133{
5134 struct http_hdr list[MAX_HTTP_HDR];
5135 struct h2c *h2c = h2s->h2c;
5136 struct htx_blk *blk;
5137 struct htx_blk *blk_end;
5138 struct buffer outbuf;
Willy Tarreaubcc45952019-05-26 10:05:50 +02005139 struct buffer *mbuf;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005140 struct h1m h1m;
5141 enum htx_blk_type type;
5142 uint32_t size;
5143 int ret = 0;
5144 int hdr;
5145 int idx;
5146 void *start;
5147
5148 if (h2c_mux_busy(h2c, h2s)) {
5149 h2s->flags |= H2_SF_BLK_MBUSY;
5150 goto end;
5151 }
5152
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005153 /* The principle is that we parse each and every trailers block using
5154 * the H1 headers parser, and append it to the list. We don't proceed
5155 * until EOM is met. blk_end will point to the EOM block.
5156 */
5157 hdr = 0;
5158 memset(list, 0, sizeof(list));
5159 blk_end = NULL;
5160
5161 for (idx = htx_get_head(htx); idx != -1; idx = htx_get_next(htx, idx)) {
5162 blk = htx_get_blk(htx, idx);
5163 type = htx_get_blk_type(blk);
5164
5165 if (type == HTX_BLK_UNUSED)
5166 continue;
5167
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005168 if (type != HTX_BLK_TLR)
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005169 break;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005170
5171 if (unlikely(hdr >= sizeof(list)/sizeof(list[0]) - 1))
5172 goto fail;
5173
5174 size = htx_get_blksz(blk);
5175 start = htx_get_blk_ptr(htx, blk);
5176
5177 h1m.flags = H1_MF_HDRS_ONLY | H1_MF_TOLOWER;
5178 h1m.err_pos = 0;
5179 ret = h1_headers_to_hdr_list(start, start + size,
5180 list + hdr, sizeof(list)/sizeof(list[0]) - hdr,
5181 &h1m, NULL);
5182 if (ret < 0)
5183 goto fail;
5184
5185 /* ret == 0 if an incomplete trailers block was found (missing
5186 * empty line), or > 0 if it was found. We have to continue on
5187 * incomplete messages because the trailers block might be
5188 * incomplete.
5189 */
5190
5191 /* search the new end */
5192 while (hdr <= sizeof(list)/sizeof(list[0])) {
5193 if (!list[hdr].n.len)
5194 break;
5195 hdr++;
5196 }
5197 }
5198
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005199 if (list[hdr].n.len != 0)
5200 goto fail; // empty trailer not found: internal error
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005201
Willy Tarreau9c218e72019-05-26 10:08:28 +02005202 mbuf = br_tail(h2c->mbuf);
5203 retry:
5204 if (!h2_get_buf(h2c, mbuf)) {
5205 h2c->flags |= H2_CF_MUX_MALLOC;
5206 h2s->flags |= H2_SF_BLK_MROOM;
5207 goto end;
5208 }
5209
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005210 chunk_reset(&outbuf);
5211
5212 while (1) {
Willy Tarreaubcc45952019-05-26 10:05:50 +02005213 outbuf = b_make(b_tail(mbuf), b_contig_space(mbuf), 0, 0);
5214 if (outbuf.size >= 9 || !b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005215 break;
5216 realign_again:
Willy Tarreaubcc45952019-05-26 10:05:50 +02005217 b_slow_realign(mbuf, trash.area, b_data(mbuf));
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005218 }
5219
5220 if (outbuf.size < 9)
5221 goto full;
5222
5223 /* len: 0x000000 (fill later), type: 1(HEADERS), flags: ENDH=4,ES=1 */
5224 memcpy(outbuf.area, "\x00\x00\x00\x01\x05", 5);
5225 write_n32(outbuf.area + 5, h2s->id); // 4 bytes
5226 outbuf.data = 9;
5227
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005228 /* encode all headers */
5229 for (idx = 0; idx < hdr; idx++) {
5230 /* these ones do not exist in H2 or must not appear in
5231 * trailers and must be dropped.
5232 */
5233 if (isteq(list[idx].n, ist("host")) ||
5234 isteq(list[idx].n, ist("content-length")) ||
5235 isteq(list[idx].n, ist("connection")) ||
5236 isteq(list[idx].n, ist("proxy-connection")) ||
5237 isteq(list[idx].n, ist("keep-alive")) ||
5238 isteq(list[idx].n, ist("upgrade")) ||
5239 isteq(list[idx].n, ist("te")) ||
5240 isteq(list[idx].n, ist("transfer-encoding")))
5241 continue;
5242
5243 if (!hpack_encode_header(&outbuf, list[idx].n, list[idx].v)) {
5244 /* output full */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005245 if (b_space_wraps(mbuf))
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005246 goto realign_again;
5247 goto full;
5248 }
5249 }
5250
Willy Tarreau5121e5d2019-05-06 15:13:41 +02005251 if (outbuf.data == 9) {
5252 /* here we have a problem, we have nothing to emit (either we
5253 * received an empty trailers block followed or we removed its
5254 * contents above). Because of this we can't send a HEADERS
5255 * frame, so we have to cheat and instead send an empty DATA
5256 * frame conveying the ES flag.
Willy Tarreau67b8cae2019-02-21 18:16:35 +01005257 */
5258 outbuf.area[3] = H2_FT_DATA;
5259 outbuf.area[4] = H2_F_DATA_END_STREAM;
5260 }
5261
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005262 /* update the frame's size */
5263 h2_set_frame_size(outbuf.area, outbuf.data - 9);
5264
5265 /* commit the H2 response */
Willy Tarreaubcc45952019-05-26 10:05:50 +02005266 b_add(mbuf, outbuf.data);
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005267 h2s->flags |= H2_SF_ES_SENT;
5268
5269 if (h2s->st == H2_SS_OPEN)
5270 h2s->st = H2_SS_HLOC;
5271 else
5272 h2s_close(h2s);
5273
5274 /* OK we could properly deliver the response */
5275 done:
Willy Tarreaufb07b3f2019-05-06 11:23:29 +02005276 /* remove all header blocks till the end and compute the corresponding size. */
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005277 ret = 0;
5278 idx = htx_get_head(htx);
5279 blk = htx_get_blk(htx, idx);
5280 while (blk != blk_end) {
5281 ret += htx_get_blksz(blk);
5282 blk = htx_remove_blk(htx, blk);
5283 }
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005284 end:
5285 return ret;
5286 full:
Willy Tarreau9c218e72019-05-26 10:08:28 +02005287 if ((mbuf = br_tail_add(h2c->mbuf)) != NULL)
5288 goto retry;
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005289 h2c->flags |= H2_CF_MUX_MFULL;
5290 h2s->flags |= H2_SF_BLK_MROOM;
5291 ret = 0;
5292 goto end;
5293 fail:
5294 /* unparsable HTX messages, too large ones to be produced in the local
5295 * list etc go here (unrecoverable errors).
5296 */
5297 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5298 ret = 0;
5299 goto end;
5300}
5301
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005302/* Called from the upper layer, to subscribe to events, such as being able to send.
5303 * The <param> argument here is supposed to be a pointer to a wait_event struct
5304 * which will be passed to h2s->recv_wait or h2s->send_wait depending on the
5305 * event_type. The event_type must only be a combination of SUB_RETRY_RECV and
5306 * SUB_RETRY_SEND, other values will lead to -1 being returned. It always
5307 * returns 0 except for the error above.
5308 */
Olivier Houchard6ff20392018-07-17 18:46:31 +02005309static int h2_subscribe(struct conn_stream *cs, int event_type, void *param)
5310{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005311 struct wait_event *sw;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005312 struct h2s *h2s = cs->ctx;
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005313 struct h2c *h2c = h2s->h2c;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005314
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005315 if (event_type & SUB_RETRY_RECV) {
Olivier Houchard4cf7fb12018-08-02 19:23:05 +02005316 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005317 BUG_ON(h2s->recv_wait != NULL || (sw->events & SUB_RETRY_RECV));
5318 sw->events |= SUB_RETRY_RECV;
5319 h2s->recv_wait = sw;
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005320 event_type &= ~SUB_RETRY_RECV;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005321 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005322 if (event_type & SUB_RETRY_SEND) {
Olivier Houchard6ff20392018-07-17 18:46:31 +02005323 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005324 BUG_ON(h2s->send_wait != NULL || (sw->events & SUB_RETRY_SEND));
5325 sw->events |= SUB_RETRY_SEND;
5326 h2s->send_wait = sw;
5327 if (!(h2s->flags & H2_SF_BLK_SFCTL) &&
5328 !LIST_ADDED(&h2s->list)) {
5329 if (h2s->flags & H2_SF_BLK_MFCTL)
5330 LIST_ADDQ(&h2c->fctl_list, &h2s->list);
5331 else
5332 LIST_ADDQ(&h2c->send_list, &h2s->list);
Olivier Houcharde1c6dbc2018-08-01 17:06:43 +02005333 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005334 event_type &= ~SUB_RETRY_SEND;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005335 }
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005336 if (event_type != 0)
5337 return -1;
5338 return 0;
Olivier Houchard6ff20392018-07-17 18:46:31 +02005339}
5340
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005341/* Called from the upper layer, to unsubscribe some events (undo h2_subscribe).
5342 * The <param> argument here is supposed to be a pointer to the same wait_event
5343 * struct that was passed to h2_subscribe() otherwise nothing will be changed.
5344 * It always returns zero.
5345 */
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005346static int h2_unsubscribe(struct conn_stream *cs, int event_type, void *param)
5347{
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005348 struct wait_event *sw;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005349 struct h2s *h2s = cs->ctx;
5350
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005351 if (event_type & SUB_RETRY_RECV) {
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005352 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005353 BUG_ON(h2s->recv_wait != sw);
5354 sw->events &= ~SUB_RETRY_RECV;
5355 h2s->recv_wait = NULL;
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005356 }
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005357 if (event_type & SUB_RETRY_SEND) {
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005358 sw = param;
Olivier Houchardf8338152019-05-14 17:50:32 +02005359 BUG_ON(h2s->send_wait != sw);
5360 LIST_DEL(&h2s->list);
5361 LIST_INIT(&h2s->list);
5362 sw->events &= ~SUB_RETRY_SEND;
5363 /* We were about to send, make sure it does not happen */
5364 if (LIST_ADDED(&h2s->sending_list) &&
5365 h2s->send_wait != &h2s->wait_event) {
5366 task_remove_from_tasklet_list((struct task *)h2s->send_wait->task);
5367 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd846c262018-10-19 17:24:29 +02005368 }
Olivier Houchardf8338152019-05-14 17:50:32 +02005369 h2s->send_wait = NULL;
Olivier Houchardd846c262018-10-19 17:24:29 +02005370 }
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005371 return 0;
5372}
5373
5374
Olivier Houchard511efea2018-08-16 15:30:32 +02005375/* Called from the upper layer, to receive data */
5376static size_t h2_rcv_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
5377{
Olivier Houchard638b7992018-08-16 15:41:52 +02005378 struct h2s *h2s = cs->ctx;
Willy Tarreau082f5592018-11-25 08:03:32 +01005379 struct h2c *h2c = h2s->h2c;
Willy Tarreau86724e22018-12-01 23:19:43 +01005380 struct htx *h2s_htx = NULL;
5381 struct htx *buf_htx = NULL;
5382 struct htx_ret htx_ret;
Olivier Houchard511efea2018-08-16 15:30:32 +02005383 size_t ret = 0;
5384
5385 /* transfer possibly pending data to the upper layer */
Willy Tarreau86724e22018-12-01 23:19:43 +01005386 if (h2c->proxy->options2 & PR_O2_USE_HTX) {
5387 /* in HTX mode we ignore the count argument */
5388 h2s_htx = htx_from_buf(&h2s->rxbuf);
Olivier Houchard56b03482018-12-10 16:09:53 +01005389 if (htx_is_empty(h2s_htx)) {
Christopher Faulet37070b22019-02-14 15:12:14 +01005390 /* Here htx_to_buf() will set buffer data to 0 because
5391 * the HTX is empty.
5392 */
5393 htx_to_buf(h2s_htx, &h2s->rxbuf);
Willy Tarreau86724e22018-12-01 23:19:43 +01005394 goto end;
Olivier Houchard56b03482018-12-10 16:09:53 +01005395 }
Willy Tarreau86724e22018-12-01 23:19:43 +01005396
5397 buf_htx = htx_from_buf(buf);
Christopher Fauleta413e952019-01-21 11:49:37 +01005398 count = htx_free_data_space(buf_htx);
5399 if (flags & CO_RFL_KEEP_RSV) {
5400 if (count <= global.tune.maxrewrite)
5401 goto end;
5402 count -= global.tune.maxrewrite;
5403 }
Willy Tarreau86724e22018-12-01 23:19:43 +01005404
Willy Tarreau0c22fa72018-12-04 15:21:35 +01005405 htx_ret = htx_xfer_blks(buf_htx, h2s_htx, count, HTX_BLK_EOM);
Willy Tarreau7196dd62019-03-05 10:51:11 +01005406
5407 if (h2s_htx->flags & HTX_FL_PARSING_ERROR)
5408 buf_htx->flags |= HTX_FL_PARSING_ERROR;
5409
Christopher Fauleteaf0d2a2019-02-18 16:04:35 +01005410 buf_htx->extra = (h2s_htx->extra ? (h2s_htx->data + h2s_htx->extra) : 0);
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005411 htx_to_buf(buf_htx, buf);
5412 htx_to_buf(h2s_htx, &h2s->rxbuf);
Willy Tarreau86724e22018-12-01 23:19:43 +01005413 ret = htx_ret.ret;
5414 }
5415 else {
5416 ret = b_xfer(buf, &h2s->rxbuf, count);
5417 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005418
Christopher Faulet37070b22019-02-14 15:12:14 +01005419 end:
Olivier Houchard638b7992018-08-16 15:41:52 +02005420 if (b_data(&h2s->rxbuf))
Olivier Houchardd247be02018-12-06 16:22:29 +01005421 cs->flags |= (CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Olivier Houchard511efea2018-08-16 15:30:32 +02005422 else {
Olivier Houchardd247be02018-12-06 16:22:29 +01005423 cs->flags &= ~(CS_FL_RCV_MORE | CS_FL_WANT_ROOM);
Christopher Fauletfa922f02019-05-07 10:55:17 +02005424 if (h2s->flags & H2_SF_ES_RCVD)
5425 cs->flags |= CS_FL_EOI;
Willy Tarreau99ad1b32019-05-14 11:46:28 +02005426 if (H2_SS_MASK(h2s->st) & H2_SS_EOS_BITS)
Olivier Houchard511efea2018-08-16 15:30:32 +02005427 cs->flags |= CS_FL_EOS;
Olivier Houchard71748cb2018-12-17 14:16:46 +01005428 if (cs->flags & CS_FL_ERR_PENDING)
5429 cs->flags |= CS_FL_ERROR;
Olivier Houchard638b7992018-08-16 15:41:52 +02005430 if (b_size(&h2s->rxbuf)) {
5431 b_free(&h2s->rxbuf);
5432 offer_buffers(NULL, tasks_run_queue);
5433 }
Olivier Houchard511efea2018-08-16 15:30:32 +02005434 }
5435
Willy Tarreau082f5592018-11-25 08:03:32 +01005436 if (ret && h2c->dsi == h2s->id) {
5437 /* demux is blocking on this stream's buffer */
5438 h2c->flags &= ~H2_CF_DEM_SFULL;
Olivier Houchard3ca18bf2019-04-05 15:34:34 +02005439 h2c_restart_reading(h2c, 1);
Willy Tarreau082f5592018-11-25 08:03:32 +01005440 }
Christopher Faulet37070b22019-02-14 15:12:14 +01005441
Olivier Houchard511efea2018-08-16 15:30:32 +02005442 return ret;
5443}
5444
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005445/* stops all senders of this connection for example when the mux buffer is full.
5446 * They are moved from the sending_list to either fctl_list or send_list.
5447 */
Olivier Houchardd846c262018-10-19 17:24:29 +02005448static void h2_stop_senders(struct h2c *h2c)
5449{
5450 struct h2s *h2s, *h2s_back;
5451
Olivier Houchardd360ac62019-03-22 17:37:16 +01005452 list_for_each_entry_safe(h2s, h2s_back, &h2c->sending_list, sending_list) {
5453 LIST_DEL_INIT(&h2s->sending_list);
Willy Tarreaue73256f2019-03-25 18:02:54 +01005454 task_remove_from_tasklet_list((struct task *)h2s->send_wait->task);
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005455 h2s->send_wait->events |= SUB_RETRY_SEND;
Olivier Houchardd846c262018-10-19 17:24:29 +02005456 }
5457}
5458
Willy Tarreau749f5ca2019-03-21 19:19:36 +01005459/* Called from the upper layer, to send data from buffer <buf> for no more than
5460 * <count> bytes. Returns the number of bytes effectively sent. Some status
5461 * flags may be updated on the conn_stream.
5462 */
Christopher Fauletd44a9b32018-07-27 11:59:41 +02005463static size_t h2_snd_buf(struct conn_stream *cs, struct buffer *buf, size_t count, int flags)
Willy Tarreau62f52692017-10-08 23:01:42 +02005464{
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005465 struct h2s *h2s = cs->ctx;
Olivier Houchard8122a8d2018-12-03 19:13:29 +01005466 size_t orig_count = count;
Willy Tarreau1dc41e72018-06-14 13:21:28 +02005467 size_t total = 0;
Willy Tarreau5dd17352018-06-14 13:33:30 +02005468 size_t ret;
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005469 struct htx *htx;
5470 struct htx_blk *blk;
5471 enum htx_blk_type btype;
5472 uint32_t bsize;
5473 int32_t idx;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005474
Olivier Houchardd360ac62019-03-22 17:37:16 +01005475 /* If we were not just woken because we wanted to send but couldn't,
5476 * and there's somebody else that is waiting to send, do nothing,
5477 * we will subscribe later and be put at the end of the list
5478 */
Willy Tarreauc234ae32019-05-13 17:56:11 +02005479 if (!LIST_ADDED(&h2s->sending_list) &&
Olivier Houchardd360ac62019-03-22 17:37:16 +01005480 (!LIST_ISEMPTY(&h2s->h2c->send_list) || !LIST_ISEMPTY(&h2s->h2c->fctl_list)))
5481 return 0;
Olivier Houchard998410a2019-04-15 19:23:37 +02005482 LIST_DEL_INIT(&h2s->sending_list);
Olivier Houchardd360ac62019-03-22 17:37:16 +01005483
Olivier Houchard998410a2019-04-15 19:23:37 +02005484 /* We couldn't set it to NULL before, because we needed it in case
5485 * we had to cancel the tasklet
5486 */
5487 h2s->send_wait = NULL;
5488
Willy Tarreau6bf641a2018-10-08 09:43:03 +02005489 if (h2s->h2c->st0 < H2_CS_FRAME_H)
5490 return 0;
5491
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005492 /* htx will be enough to decide if we're using HTX or legacy */
5493 htx = (h2s->h2c->proxy->options2 & PR_O2_USE_HTX) ? htx_from_buf(buf) : NULL;
5494
Willy Tarreau0bad0432018-06-14 16:54:01 +02005495 if (!(h2s->flags & H2_SF_OUTGOING_DATA) && count)
Willy Tarreauc4312d32017-11-07 12:01:53 +01005496 h2s->flags |= H2_SF_OUTGOING_DATA;
5497
Willy Tarreau751f2d02018-10-05 09:35:00 +02005498 if (h2s->id == 0) {
5499 int32_t id = h2c_get_next_sid(h2s->h2c);
5500
5501 if (id < 0) {
Willy Tarreau751f2d02018-10-05 09:35:00 +02005502 cs->flags |= CS_FL_ERROR;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005503 return 0;
5504 }
5505
5506 eb32_delete(&h2s->by_id);
5507 h2s->by_id.key = h2s->id = id;
5508 h2s->h2c->max_id = id;
Willy Tarreaud64a3eb2019-01-23 10:22:21 +01005509 h2s->h2c->nb_reserved--;
Willy Tarreau751f2d02018-10-05 09:35:00 +02005510 eb32_insert(&h2s->h2c->streams_by_id, &h2s->by_id);
5511 }
5512
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005513 if (htx) {
Willy Tarreau2b778482019-05-06 15:00:22 +02005514 while (h2s->st < H2_SS_HLOC && !(h2s->flags & H2_SF_BLK_ANY) &&
Willy Tarreauc14999b2018-12-06 14:09:09 +01005515 count && !htx_is_empty(htx)) {
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005516 idx = htx_get_head(htx);
5517 blk = htx_get_blk(htx, idx);
5518 btype = htx_get_blk_type(blk);
5519 bsize = htx_get_blksz(blk);
5520
5521 switch (btype) {
Willy Tarreau80739692018-10-05 11:35:57 +02005522 case HTX_BLK_REQ_SL:
5523 /* start-line before headers */
5524 ret = h2s_htx_bck_make_req_headers(h2s, htx);
5525 if (ret > 0) {
5526 total += ret;
5527 count -= ret;
5528 if (ret < bsize)
5529 goto done;
5530 }
5531 break;
5532
Willy Tarreau115e83b2018-12-01 19:17:53 +01005533 case HTX_BLK_RES_SL:
5534 /* start-line before headers */
5535 ret = h2s_htx_frt_make_resp_headers(h2s, htx);
5536 if (ret > 0) {
5537 total += ret;
5538 count -= ret;
5539 if (ret < bsize)
5540 goto done;
5541 }
5542 break;
5543
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005544 case HTX_BLK_DATA:
5545 case HTX_BLK_EOD:
5546 case HTX_BLK_EOM:
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005547 /* all these cause the emission of a DATA frame (possibly empty).
5548 * This EOM necessarily is one before trailers, as the EOM following
5549 * trailers would have been consumed by the trailers parser.
5550 */
Willy Tarreau98de12a2018-12-12 07:03:00 +01005551 ret = h2s_htx_frt_make_resp_data(h2s, buf, count);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005552 if (ret > 0) {
Willy Tarreau98de12a2018-12-12 07:03:00 +01005553 htx = htx_from_buf(buf);
Willy Tarreau0c535fd2018-12-01 19:25:56 +01005554 total += ret;
5555 count -= ret;
5556 if (ret < bsize)
5557 goto done;
5558 }
5559 break;
5560
Willy Tarreau1bb812f2019-01-04 10:56:26 +01005561 case HTX_BLK_TLR:
5562 /* This is the first trailers block, all the subsequent ones AND
5563 * the EOM will be swallowed by the parser.
5564 */
5565 ret = h2s_htx_make_trailers(h2s, htx);
5566 if (ret > 0) {
5567 total += ret;
5568 count -= ret;
5569 if (ret < bsize)
5570 goto done;
5571 }
5572 break;
5573
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005574 default:
5575 htx_remove_blk(htx, blk);
5576 total += bsize;
5577 count -= bsize;
5578 break;
5579 }
5580 }
5581 goto done;
5582 }
5583
5584 /* legacy transfer mode */
Willy Tarreaua40704a2018-09-11 13:52:04 +02005585 while (h2s->h1m.state < H1_MSG_DONE && count) {
Willy Tarreau001823c2018-09-12 17:25:32 +02005586 if (h2s->h1m.state <= H1_MSG_LAST_LF) {
Willy Tarreau80739692018-10-05 11:35:57 +02005587 if (h2s->h2c->flags & H2_CF_IS_BACK)
5588 ret = -1;
5589 else
5590 ret = h2s_frt_make_resp_headers(h2s, buf, total, count);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005591 }
Willy Tarreaua40704a2018-09-11 13:52:04 +02005592 else if (h2s->h1m.state < H1_MSG_TRAILERS) {
Willy Tarreau0bad0432018-06-14 16:54:01 +02005593 ret = h2s_frt_make_resp_data(h2s, buf, total, count);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005594 }
Willy Tarreaua40704a2018-09-11 13:52:04 +02005595 else if (h2s->h1m.state == H1_MSG_TRAILERS) {
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005596 /* consume the trailers if any (we don't forward them for now) */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005597 ret = h1_measure_trailers(buf, total, count);
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005598
Willy Tarreau5dd17352018-06-14 13:33:30 +02005599 if (unlikely((int)ret <= 0)) {
5600 if ((int)ret < 0)
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005601 h2s_error(h2s, H2_ERR_INTERNAL_ERROR);
5602 break;
5603 }
Willy Tarreau35a62702018-02-27 15:37:25 +01005604 // trim any possibly pending data (eg: extra CR-LF, ...)
Willy Tarreau0bad0432018-06-14 16:54:01 +02005605 total += count;
5606 count = 0;
Willy Tarreaua40704a2018-09-11 13:52:04 +02005607 h2s->h1m.state = H1_MSG_DONE;
Willy Tarreau9d89ac82017-10-31 17:15:59 +01005608 break;
Willy Tarreauc652dbd2017-10-19 11:16:37 +02005609 }
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005610 else {
Willy Tarreauec988c72018-12-19 18:00:29 +01005611 cs_set_error(cs);
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005612 break;
5613 }
Willy Tarreau0bad0432018-06-14 16:54:01 +02005614
5615 total += ret;
5616 count -= ret;
5617
Willy Tarreau2b778482019-05-06 15:00:22 +02005618 if (h2s->st >= H2_SS_HLOC)
Willy Tarreau0bad0432018-06-14 16:54:01 +02005619 break;
5620
5621 if (h2s->flags & H2_SF_BLK_ANY)
5622 break;
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005623 }
5624
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005625 done:
Willy Tarreau2b778482019-05-06 15:00:22 +02005626 if (h2s->st >= H2_SS_HLOC) {
Willy Tarreau00610962018-07-19 10:58:28 +02005627 /* trim any possibly pending data after we close (extra CR-LF,
5628 * unprocessed trailers, abnormal extra data, ...)
5629 */
Willy Tarreau0bad0432018-06-14 16:54:01 +02005630 total += count;
5631 count = 0;
Willy Tarreau00610962018-07-19 10:58:28 +02005632 }
5633
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005634 /* RST are sent similarly to frame acks */
Willy Tarreau02492192017-12-07 15:59:29 +01005635 if (h2s->st == H2_SS_ERROR || h2s->flags & H2_SF_RST_RCVD) {
Willy Tarreauec988c72018-12-19 18:00:29 +01005636 cs_set_error(cs);
Willy Tarreau8c0ea7d2017-11-10 10:05:24 +01005637 if (h2s_send_rst_stream(h2s->h2c, h2s) > 0)
Willy Tarreau00dd0782018-03-01 16:31:34 +01005638 h2s_close(h2s);
Willy Tarreauc6795ca2017-11-07 09:43:06 +01005639 }
5640
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005641 if (htx) {
Christopher Faulet27ba2dc2018-12-05 11:53:24 +01005642 htx_to_buf(htx, buf);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005643 } else {
5644 b_del(buf, total);
5645 }
Olivier Houchardd846c262018-10-19 17:24:29 +02005646
5647 /* The mux is full, cancel the pending tasks */
5648 if ((h2s->h2c->flags & H2_CF_MUX_BLOCK_ANY) ||
5649 (h2s->flags & H2_SF_BLK_MBUSY))
5650 h2_stop_senders(h2s->h2c);
Willy Tarreaubcd3bb32018-12-01 18:59:00 +01005651
Olivier Houchard8122a8d2018-12-03 19:13:29 +01005652 /* If we're running HTX, and we read the whole buffer, then pretend
5653 * we read exactly what the caller specified, as with HTX the caller
5654 * will always give the buffer size, instead of the amount of data
5655 * available.
5656 */
5657 if (htx && !b_data(buf))
5658 total = orig_count;
5659
Olivier Houchard7505f942018-08-21 18:10:44 +02005660 if (total > 0) {
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005661 if (!(h2s->h2c->wait_event.events & SUB_RETRY_SEND))
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005662 tasklet_wakeup(h2s->h2c->wait_event.task);
Olivier Houchardd846c262018-10-19 17:24:29 +02005663
Olivier Houchard7505f942018-08-21 18:10:44 +02005664 }
Olivier Houchard6dea2ee2018-12-19 18:16:17 +01005665 /* If we're waiting for flow control, and we got a shutr on the
5666 * connection, we will never be unlocked, so add an error on
5667 * the conn_stream.
5668 */
5669 if (conn_xprt_read0_pending(h2s->h2c->conn) &&
5670 !b_data(&h2s->h2c->dbuf) &&
5671 (h2s->flags & (H2_SF_BLK_SFCTL | H2_SF_BLK_MFCTL))) {
5672 if (cs->flags & CS_FL_EOS)
5673 cs->flags |= CS_FL_ERROR;
5674 else
5675 cs->flags |= CS_FL_ERR_PENDING;
5676 }
Olivier Houchard998410a2019-04-15 19:23:37 +02005677 if (total > 0) {
Olivier Houchardd360ac62019-03-22 17:37:16 +01005678 /* Ok we managed to send something, leave the send_list */
Olivier Houchardd360ac62019-03-22 17:37:16 +01005679 LIST_DEL_INIT(&h2s->list);
5680 }
Willy Tarreau9e5ae1d2017-10-17 19:58:20 +02005681 return total;
Willy Tarreau62f52692017-10-08 23:01:42 +02005682}
5683
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005684/* for debugging with CLI's "show fd" command */
Willy Tarreau83061a82018-07-13 11:56:34 +02005685static void h2_show_fd(struct buffer *msg, struct connection *conn)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005686{
Willy Tarreau3d2ee552018-12-19 14:12:10 +01005687 struct h2c *h2c = conn->ctx;
Willy Tarreau987c0632018-12-18 10:32:05 +01005688 struct h2s *h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005689 struct eb32_node *node;
5690 int fctl_cnt = 0;
5691 int send_cnt = 0;
5692 int tree_cnt = 0;
5693 int orph_cnt = 0;
Willy Tarreau60f62682019-05-26 11:32:27 +02005694 struct buffer *hmbuf, *tmbuf;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005695
5696 if (!h2c)
5697 return;
5698
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005699 list_for_each_entry(h2s, &h2c->fctl_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005700 fctl_cnt++;
5701
Olivier Houchardfa8aa862018-10-10 18:25:41 +02005702 list_for_each_entry(h2s, &h2c->send_list, list)
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005703 send_cnt++;
5704
Willy Tarreau3af37712018-12-18 14:34:41 +01005705 h2s = NULL;
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005706 node = eb32_first(&h2c->streams_by_id);
5707 while (node) {
5708 h2s = container_of(node, struct h2s, by_id);
5709 tree_cnt++;
5710 if (!h2s->cs)
5711 orph_cnt++;
5712 node = eb32_next(node);
5713 }
5714
Willy Tarreau60f62682019-05-26 11:32:27 +02005715 hmbuf = br_head(h2c->mbuf);
Willy Tarreaubcc45952019-05-26 10:05:50 +02005716 tmbuf = br_tail(h2c->mbuf);
Willy Tarreau987c0632018-12-18 10:32:05 +01005717 chunk_appendf(msg, " h2c.st0=%d .err=%d .maxid=%d .lastid=%d .flg=0x%04x"
5718 " .nbst=%u .nbcs=%u .fctl_cnt=%d .send_cnt=%d .tree_cnt=%d"
Willy Tarreau60f62682019-05-26 11:32:27 +02005719 " .orph_cnt=%d .sub=%d .dsi=%d .dbuf=%u@%p+%u/%u .msi=%d"
5720 " .mbuf=[%u..%u|%u],h=[%u@%p+%u/%u],t=[%u@%p+%u/%u]",
Willy Tarreau616ac812018-07-24 14:12:42 +02005721 h2c->st0, h2c->errcode, h2c->max_id, h2c->last_sid, h2c->flags,
5722 h2c->nb_streams, h2c->nb_cs, fctl_cnt, send_cnt, tree_cnt, orph_cnt,
Willy Tarreau4f6516d2018-12-19 13:59:17 +01005723 h2c->wait_event.events, h2c->dsi,
Willy Tarreau987c0632018-12-18 10:32:05 +01005724 (unsigned int)b_data(&h2c->dbuf), b_orig(&h2c->dbuf),
5725 (unsigned int)b_head_ofs(&h2c->dbuf), (unsigned int)b_size(&h2c->dbuf),
5726 h2c->msi,
Willy Tarreau60f62682019-05-26 11:32:27 +02005727 br_head_idx(h2c->mbuf), br_tail_idx(h2c->mbuf), br_size(h2c->mbuf),
5728 (unsigned int)b_data(hmbuf), b_orig(hmbuf),
5729 (unsigned int)b_head_ofs(hmbuf), (unsigned int)b_size(hmbuf),
Willy Tarreaubcc45952019-05-26 10:05:50 +02005730 (unsigned int)b_data(tmbuf), b_orig(tmbuf),
5731 (unsigned int)b_head_ofs(tmbuf), (unsigned int)b_size(tmbuf));
Willy Tarreau987c0632018-12-18 10:32:05 +01005732
5733 if (h2s) {
5734 chunk_appendf(msg, " last_h2s=%p .id=%d .flg=0x%04x .rxbuf=%u@%p+%u/%u .cs=%p",
5735 h2s, h2s->id, h2s->flags,
5736 (unsigned int)b_data(&h2s->rxbuf), b_orig(&h2s->rxbuf),
5737 (unsigned int)b_head_ofs(&h2s->rxbuf), (unsigned int)b_size(&h2s->rxbuf),
5738 h2s->cs);
5739 if (h2s->cs)
5740 chunk_appendf(msg, " .cs.flg=0x%08x .cs.data=%p",
5741 h2s->cs->flags, h2s->cs->data);
5742 }
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005743}
Willy Tarreau62f52692017-10-08 23:01:42 +02005744
5745/*******************************************************/
5746/* functions below are dedicated to the config parsers */
5747/*******************************************************/
5748
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005749/* config parser for global "tune.h2.header-table-size" */
5750static int h2_parse_header_table_size(char **args, int section_type, struct proxy *curpx,
5751 struct proxy *defpx, const char *file, int line,
5752 char **err)
5753{
5754 if (too_many_args(1, args, err, NULL))
5755 return -1;
5756
5757 h2_settings_header_table_size = atoi(args[1]);
5758 if (h2_settings_header_table_size < 4096 || h2_settings_header_table_size > 65536) {
5759 memprintf(err, "'%s' expects a numeric value between 4096 and 65536.", args[0]);
5760 return -1;
5761 }
5762 return 0;
5763}
Willy Tarreau62f52692017-10-08 23:01:42 +02005764
Willy Tarreaue6baec02017-07-27 11:45:11 +02005765/* config parser for global "tune.h2.initial-window-size" */
5766static int h2_parse_initial_window_size(char **args, int section_type, struct proxy *curpx,
5767 struct proxy *defpx, const char *file, int line,
5768 char **err)
5769{
5770 if (too_many_args(1, args, err, NULL))
5771 return -1;
5772
5773 h2_settings_initial_window_size = atoi(args[1]);
5774 if (h2_settings_initial_window_size < 0) {
5775 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5776 return -1;
5777 }
5778 return 0;
5779}
5780
Willy Tarreau5242ef82017-07-27 11:47:28 +02005781/* config parser for global "tune.h2.max-concurrent-streams" */
5782static int h2_parse_max_concurrent_streams(char **args, int section_type, struct proxy *curpx,
5783 struct proxy *defpx, const char *file, int line,
5784 char **err)
5785{
5786 if (too_many_args(1, args, err, NULL))
5787 return -1;
5788
5789 h2_settings_max_concurrent_streams = atoi(args[1]);
Willy Tarreau5a490b62019-01-31 10:39:51 +01005790 if ((int)h2_settings_max_concurrent_streams < 0) {
Willy Tarreau5242ef82017-07-27 11:47:28 +02005791 memprintf(err, "'%s' expects a positive numeric value.", args[0]);
5792 return -1;
5793 }
5794 return 0;
5795}
5796
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005797/* config parser for global "tune.h2.max-frame-size" */
5798static int h2_parse_max_frame_size(char **args, int section_type, struct proxy *curpx,
5799 struct proxy *defpx, const char *file, int line,
5800 char **err)
5801{
5802 if (too_many_args(1, args, err, NULL))
5803 return -1;
5804
5805 h2_settings_max_frame_size = atoi(args[1]);
5806 if (h2_settings_max_frame_size < 16384 || h2_settings_max_frame_size > 16777215) {
5807 memprintf(err, "'%s' expects a numeric value between 16384 and 16777215.", args[0]);
5808 return -1;
5809 }
5810 return 0;
5811}
5812
Willy Tarreau62f52692017-10-08 23:01:42 +02005813
5814/****************************************/
5815/* MUX initialization and instanciation */
5816/***************************************/
5817
5818/* The mux operations */
Willy Tarreau680b2bd2018-11-27 07:30:17 +01005819static const struct mux_ops h2_ops = {
Willy Tarreau62f52692017-10-08 23:01:42 +02005820 .init = h2_init,
Olivier Houchard21df6cc2018-09-14 23:21:44 +02005821 .wake = h2_wake,
Willy Tarreau62f52692017-10-08 23:01:42 +02005822 .snd_buf = h2_snd_buf,
Olivier Houchard511efea2018-08-16 15:30:32 +02005823 .rcv_buf = h2_rcv_buf,
Olivier Houchard6ff20392018-07-17 18:46:31 +02005824 .subscribe = h2_subscribe,
Olivier Houchard83a0cd82018-09-28 17:57:58 +02005825 .unsubscribe = h2_unsubscribe,
Willy Tarreau62f52692017-10-08 23:01:42 +02005826 .attach = h2_attach,
Willy Tarreaufafd3982018-11-18 21:29:20 +01005827 .get_first_cs = h2_get_first_cs,
Willy Tarreau62f52692017-10-08 23:01:42 +02005828 .detach = h2_detach,
Olivier Houchard060ed432018-11-06 16:32:42 +01005829 .destroy = h2_destroy,
Olivier Houchardd540b362018-11-05 18:37:53 +01005830 .avail_streams = h2_avail_streams,
Willy Tarreau00f18a32019-01-26 12:19:01 +01005831 .used_streams = h2_used_streams,
Willy Tarreau62f52692017-10-08 23:01:42 +02005832 .shutr = h2_shutr,
5833 .shutw = h2_shutw,
Willy Tarreaue3f36cd2018-03-30 14:43:13 +02005834 .show_fd = h2_show_fd,
Willy Tarreau28f1cb92017-12-20 16:14:44 +01005835 .flags = MX_FL_CLEAN_ABRT,
Willy Tarreau62f52692017-10-08 23:01:42 +02005836 .name = "H2",
5837};
5838
Christopher Faulet32f61c02018-04-10 14:33:41 +02005839/* PROTO selection : this mux registers PROTO token "h2" */
5840static struct mux_proto_list mux_proto_h2 =
Willy Tarreauf8957272018-10-03 10:25:20 +02005841 { .token = IST("h2"), .mode = PROTO_MODE_HTTP, .side = PROTO_SIDE_FE, .mux = &h2_ops };
Willy Tarreau62f52692017-10-08 23:01:42 +02005842
Willy Tarreau0108d902018-11-25 19:14:37 +01005843INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2);
5844
Christopher Faulet9b579102019-04-11 22:52:25 +02005845
5846/* The mux operations */
5847static const struct mux_ops h2_htx_ops = {
5848 .init = h2_init,
5849 .wake = h2_wake,
5850 .snd_buf = h2_snd_buf,
5851 .rcv_buf = h2_rcv_buf,
5852 .subscribe = h2_subscribe,
5853 .unsubscribe = h2_unsubscribe,
5854 .attach = h2_attach,
5855 .get_first_cs = h2_get_first_cs,
5856 .detach = h2_detach,
5857 .destroy = h2_destroy,
5858 .avail_streams = h2_avail_streams,
5859 .used_streams = h2_used_streams,
5860 .shutr = h2_shutr,
5861 .shutw = h2_shutw,
5862 .show_fd = h2_show_fd,
Christopher Faulet9f38f5a2019-04-03 09:53:32 +02005863 .flags = MX_FL_CLEAN_ABRT|MX_FL_HTX,
Christopher Faulet9b579102019-04-11 22:52:25 +02005864 .name = "H2",
5865};
5866
Willy Tarreauf8957272018-10-03 10:25:20 +02005867static struct mux_proto_list mux_proto_h2_htx =
Christopher Faulet9b579102019-04-11 22:52:25 +02005868 { .token = IST("h2"), .mode = PROTO_MODE_HTX, .side = PROTO_SIDE_BOTH, .mux = &h2_htx_ops };
Willy Tarreauf8957272018-10-03 10:25:20 +02005869
5870INITCALL1(STG_REGISTER, register_mux_proto, &mux_proto_h2_htx);
5871
Willy Tarreau62f52692017-10-08 23:01:42 +02005872/* config keyword parsers */
5873static struct cfg_kw_list cfg_kws = {ILH, {
Willy Tarreaufe20e5b2017-07-27 11:42:14 +02005874 { CFG_GLOBAL, "tune.h2.header-table-size", h2_parse_header_table_size },
Willy Tarreaue6baec02017-07-27 11:45:11 +02005875 { CFG_GLOBAL, "tune.h2.initial-window-size", h2_parse_initial_window_size },
Willy Tarreau5242ef82017-07-27 11:47:28 +02005876 { CFG_GLOBAL, "tune.h2.max-concurrent-streams", h2_parse_max_concurrent_streams },
Willy Tarreaua24b35c2019-02-21 13:24:36 +01005877 { CFG_GLOBAL, "tune.h2.max-frame-size", h2_parse_max_frame_size },
Willy Tarreau62f52692017-10-08 23:01:42 +02005878 { 0, NULL, NULL }
5879}};
5880
Willy Tarreau0108d902018-11-25 19:14:37 +01005881INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);