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Willy Tarreaucff64112008-11-03 06:26:53 +01001/*
2 * Functions managing stream_interface structures
3 *
Willy Tarreauf873d752012-05-11 17:47:17 +02004 * Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
Willy Tarreaucff64112008-11-03 06:26:53 +01005 *
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 <errno.h>
14#include <fcntl.h>
15#include <stdio.h>
16#include <stdlib.h>
17
18#include <sys/socket.h>
19#include <sys/stat.h>
20#include <sys/types.h>
21
Willy Tarreaubf883e02014-11-25 21:10:35 +010022#include <common/buffer.h>
Willy Tarreaucff64112008-11-03 06:26:53 +010023#include <common/compat.h>
24#include <common/config.h>
25#include <common/debug.h>
26#include <common/standard.h>
27#include <common/ticks.h>
28#include <common/time.h>
29
Willy Tarreau8a8d83b2015-04-13 13:24:54 +020030#include <proto/applet.h>
Willy Tarreauc7e42382012-08-24 19:22:53 +020031#include <proto/channel.h>
Willy Tarreau8b117082012-08-06 15:06:49 +020032#include <proto/connection.h>
Willy Tarreau96199b12012-08-24 00:46:52 +020033#include <proto/pipe.h>
Willy Tarreau87b09662015-04-03 00:22:06 +020034#include <proto/stream.h>
Willy Tarreau269358d2009-09-20 20:14:49 +020035#include <proto/stream_interface.h>
Willy Tarreaucff64112008-11-03 06:26:53 +010036#include <proto/task.h>
37
Willy Tarreaufd31e532012-07-23 18:24:25 +020038#include <types/pipe.h>
39
Willy Tarreauf873d752012-05-11 17:47:17 +020040/* socket functions used when running a stream interface as a task */
Willy Tarreauf873d752012-05-11 17:47:17 +020041static void stream_int_update_embedded(struct stream_interface *si);
Willy Tarreau6fe15412013-09-29 15:16:03 +020042static void stream_int_shutr(struct stream_interface *si);
43static void stream_int_shutw(struct stream_interface *si);
Willy Tarreauf873d752012-05-11 17:47:17 +020044static void stream_int_chk_rcv(struct stream_interface *si);
45static void stream_int_chk_snd(struct stream_interface *si);
Willy Tarreauc5788912012-08-24 18:12:41 +020046static void stream_int_update_conn(struct stream_interface *si);
Willy Tarreau6fe15412013-09-29 15:16:03 +020047static void stream_int_shutr_conn(struct stream_interface *si);
48static void stream_int_shutw_conn(struct stream_interface *si);
Willy Tarreauc5788912012-08-24 18:12:41 +020049static void stream_int_chk_rcv_conn(struct stream_interface *si);
50static void stream_int_chk_snd_conn(struct stream_interface *si);
Willy Tarreaud45b9f82015-04-13 16:30:14 +020051static void stream_int_update_applet(struct stream_interface *si);
52static void stream_int_shutr_applet(struct stream_interface *si);
53static void stream_int_shutw_applet(struct stream_interface *si);
54static void stream_int_chk_rcv_applet(struct stream_interface *si);
55static void stream_int_chk_snd_applet(struct stream_interface *si);
Willy Tarreau4aa36832012-10-02 20:07:22 +020056static void si_conn_recv_cb(struct connection *conn);
57static void si_conn_send_cb(struct connection *conn);
Willy Tarreau2396c1c2012-10-03 21:12:16 +020058static int si_conn_wake_cb(struct connection *conn);
Willy Tarreau27375622013-12-17 00:00:28 +010059static int si_idle_conn_wake_cb(struct connection *conn);
60static void si_idle_conn_null_cb(struct connection *conn);
Willy Tarreauf873d752012-05-11 17:47:17 +020061
Willy Tarreauc5788912012-08-24 18:12:41 +020062/* stream-interface operations for embedded tasks */
63struct si_ops si_embedded_ops = {
Willy Tarreau5c979a92012-05-07 17:15:39 +020064 .update = stream_int_update_embedded,
Willy Tarreau5c979a92012-05-07 17:15:39 +020065 .chk_rcv = stream_int_chk_rcv,
66 .chk_snd = stream_int_chk_snd,
Willy Tarreau8b3d7df2013-09-29 14:51:58 +020067 .shutr = stream_int_shutr,
68 .shutw = stream_int_shutw,
Willy Tarreau5c979a92012-05-07 17:15:39 +020069};
70
Willy Tarreauc5788912012-08-24 18:12:41 +020071/* stream-interface operations for connections */
72struct si_ops si_conn_ops = {
73 .update = stream_int_update_conn,
74 .chk_rcv = stream_int_chk_rcv_conn,
75 .chk_snd = stream_int_chk_snd_conn,
Willy Tarreau8b3d7df2013-09-29 14:51:58 +020076 .shutr = stream_int_shutr_conn,
77 .shutw = stream_int_shutw_conn,
Willy Tarreauc5788912012-08-24 18:12:41 +020078};
79
Willy Tarreaud45b9f82015-04-13 16:30:14 +020080/* stream-interface operations for connections */
81struct si_ops si_applet_ops = {
82 .update = stream_int_update_applet,
83 .chk_rcv = stream_int_chk_rcv_applet,
84 .chk_snd = stream_int_chk_snd_applet,
85 .shutr = stream_int_shutr_applet,
86 .shutw = stream_int_shutw_applet,
87};
88
Willy Tarreau74beec32012-10-03 00:41:04 +020089struct data_cb si_conn_cb = {
Willy Tarreauc5788912012-08-24 18:12:41 +020090 .recv = si_conn_recv_cb,
91 .send = si_conn_send_cb,
Willy Tarreau4aa36832012-10-02 20:07:22 +020092 .wake = si_conn_wake_cb,
Willy Tarreauc5788912012-08-24 18:12:41 +020093};
94
Willy Tarreau27375622013-12-17 00:00:28 +010095struct data_cb si_idle_conn_cb = {
96 .recv = si_idle_conn_null_cb,
97 .send = si_idle_conn_null_cb,
98 .wake = si_idle_conn_wake_cb,
99};
100
Willy Tarreaucff64112008-11-03 06:26:53 +0100101/*
102 * This function only has to be called once after a wakeup event in case of
103 * suspected timeout. It controls the stream interface timeouts and sets
104 * si->flags accordingly. It does NOT close anything, as this timeout may
105 * be used for any purpose. It returns 1 if the timeout fired, otherwise
106 * zero.
107 */
108int stream_int_check_timeouts(struct stream_interface *si)
109{
110 if (tick_is_expired(si->exp, now_ms)) {
111 si->flags |= SI_FL_EXP;
112 return 1;
113 }
114 return 0;
115}
116
Willy Tarreaufe3718a2008-11-30 18:14:12 +0100117/* to be called only when in SI_ST_DIS with SI_FL_ERR */
Willy Tarreaucff64112008-11-03 06:26:53 +0100118void stream_int_report_error(struct stream_interface *si)
119{
120 if (!si->err_type)
121 si->err_type = SI_ET_DATA_ERR;
122
Willy Tarreau2bb4a962014-11-28 11:11:05 +0100123 si_oc(si)->flags |= CF_WRITE_ERROR;
124 si_ic(si)->flags |= CF_READ_ERROR;
Willy Tarreaucff64112008-11-03 06:26:53 +0100125}
126
127/*
Willy Tarreaudded32d2008-11-30 19:48:07 +0100128 * Returns a message to the client ; the connection is shut down for read,
129 * and the request is cleared so that no server connection can be initiated.
130 * The buffer is marked for read shutdown on the other side to protect the
131 * message, and the buffer write is enabled. The message is contained in a
Willy Tarreau148d0992010-01-10 10:21:21 +0100132 * "chunk". If it is null, then an empty message is used. The reply buffer does
133 * not need to be empty before this, and its contents will not be overwritten.
134 * The primary goal of this function is to return error messages to a client.
Willy Tarreaudded32d2008-11-30 19:48:07 +0100135 */
136void stream_int_retnclose(struct stream_interface *si, const struct chunk *msg)
137{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100138 struct channel *ic = si_ic(si);
139 struct channel *oc = si_oc(si);
140
141 channel_auto_read(ic);
142 channel_abort(ic);
143 channel_auto_close(ic);
144 channel_erase(ic);
145 channel_truncate(oc);
Willy Tarreau798e1282010-12-12 13:06:00 +0100146
Willy Tarreau148d0992010-01-10 10:21:21 +0100147 if (likely(msg && msg->len))
Willy Tarreauafc8a222014-11-28 15:46:27 +0100148 bo_inject(oc, msg->str, msg->len);
Willy Tarreaudded32d2008-11-30 19:48:07 +0100149
Willy Tarreauafc8a222014-11-28 15:46:27 +0100150 oc->wex = tick_add_ifset(now_ms, oc->wto);
151 channel_auto_read(oc);
152 channel_auto_close(oc);
153 channel_shutr_now(oc);
Willy Tarreau5d881d02009-12-27 22:51:06 +0100154}
155
Willy Tarreaufb90d942009-09-05 20:57:35 +0200156/* default update function for embedded tasks, to be used at the end of the i/o handler */
Willy Tarreauf873d752012-05-11 17:47:17 +0200157static void stream_int_update_embedded(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200158{
Willy Tarreau3488e252010-08-09 16:24:56 +0200159 int old_flags = si->flags;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100160 struct channel *ic = si_ic(si);
161 struct channel *oc = si_oc(si);
Willy Tarreau3488e252010-08-09 16:24:56 +0200162
Willy Tarreauafc8a222014-11-28 15:46:27 +0100163 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
Willy Tarreaufb90d942009-09-05 20:57:35 +0200164 __FUNCTION__,
Willy Tarreauafc8a222014-11-28 15:46:27 +0100165 si, si->state, ic->flags, oc->flags);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200166
167 if (si->state != SI_ST_EST)
168 return;
169
Willy Tarreauafc8a222014-11-28 15:46:27 +0100170 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW &&
171 channel_is_empty(oc))
Willy Tarreau73b013b2012-05-21 16:31:45 +0200172 si_shutw(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200173
Willy Tarreauafc8a222014-11-28 15:46:27 +0100174 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && channel_may_recv(oc))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200175 si->flags |= SI_FL_WAIT_DATA;
176
Willy Tarreau96fd4b52009-10-04 17:18:35 +0200177 /* we're almost sure that we need some space if the buffer is not
178 * empty, even if it's not full, because the applets can't fill it.
179 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100180 if ((ic->flags & (CF_SHUTR|CF_DONT_READ)) == 0 && !channel_is_empty(ic))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200181 si->flags |= SI_FL_WAIT_ROOM;
182
Willy Tarreauafc8a222014-11-28 15:46:27 +0100183 if (oc->flags & CF_WRITE_ACTIVITY) {
184 if (tick_isset(oc->wex))
185 oc->wex = tick_add_ifset(now_ms, oc->wto);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200186 }
187
Willy Tarreauafc8a222014-11-28 15:46:27 +0100188 if (ic->flags & CF_READ_ACTIVITY ||
189 (oc->flags & CF_WRITE_ACTIVITY && !(si->flags & SI_FL_INDEP_STR))) {
190 if (tick_isset(ic->rex))
191 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreauf27b5ea2009-10-03 22:01:18 +0200192 }
193
Willy Tarreau3488e252010-08-09 16:24:56 +0200194 /* save flags to detect changes */
195 old_flags = si->flags;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100196 if (likely((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
197 channel_may_recv(oc) &&
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100198 (si_opposite(si)->flags & SI_FL_WAIT_ROOM)))
199 si_chk_rcv(si_opposite(si));
Willy Tarreaufb90d942009-09-05 20:57:35 +0200200
Willy Tarreauafc8a222014-11-28 15:46:27 +0100201 if (((ic->flags & CF_READ_PARTIAL) && !channel_is_empty(ic)) &&
202 (ic->pipe /* always try to send spliced data */ ||
203 (ic->buf->i == 0 && (si_opposite(si)->flags & SI_FL_WAIT_DATA)))) {
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100204 si_chk_snd(si_opposite(si));
Willy Tarreau3488e252010-08-09 16:24:56 +0200205 /* check if the consumer has freed some space */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100206 if (channel_may_recv(ic) && !ic->pipe)
Willy Tarreau3488e252010-08-09 16:24:56 +0200207 si->flags &= ~SI_FL_WAIT_ROOM;
208 }
Willy Tarreaufb90d942009-09-05 20:57:35 +0200209
210 /* Note that we're trying to wake up in two conditions here :
211 * - special event, which needs the holder task attention
212 * - status indicating that the applet can go on working. This
213 * is rather hard because we might be blocking on output and
214 * don't want to wake up on input and vice-versa. The idea is
Willy Tarreau3488e252010-08-09 16:24:56 +0200215 * to only rely on the changes the chk_* might have performed.
Willy Tarreaufb90d942009-09-05 20:57:35 +0200216 */
217 if (/* check stream interface changes */
Willy Tarreau3488e252010-08-09 16:24:56 +0200218 ((old_flags & ~si->flags) & (SI_FL_WAIT_ROOM|SI_FL_WAIT_DATA)) ||
219
220 /* changes on the production side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100221 (ic->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
Willy Tarreau3488e252010-08-09 16:24:56 +0200222 si->state != SI_ST_EST ||
223 (si->flags & SI_FL_ERR) ||
Willy Tarreauafc8a222014-11-28 15:46:27 +0100224 ((ic->flags & CF_READ_PARTIAL) &&
225 (!ic->to_forward || si_opposite(si)->state != SI_ST_EST)) ||
Willy Tarreau3488e252010-08-09 16:24:56 +0200226
227 /* changes on the consumption side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100228 (oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
229 ((oc->flags & CF_WRITE_ACTIVITY) &&
230 ((oc->flags & CF_SHUTW) ||
231 ((oc->flags & CF_WAKE_WRITE) &&
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100232 (si_opposite(si)->state != SI_ST_EST ||
Willy Tarreauafc8a222014-11-28 15:46:27 +0100233 (channel_is_empty(oc) && !oc->to_forward)))))) {
Willy Tarreau07373b82014-11-28 12:08:47 +0100234 if (!(si->flags & SI_FL_DONT_WAKE))
235 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200236 }
Willy Tarreauafc8a222014-11-28 15:46:27 +0100237 if (ic->flags & CF_READ_ACTIVITY)
238 ic->flags &= ~CF_READ_DONTWAIT;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200239}
240
Willy Tarreau4a36b562012-08-06 19:31:45 +0200241/*
Willy Tarreaud45b9f82015-04-13 16:30:14 +0200242 * This function performs a shutdown-read on a detached stream interface in a
243 * connected or init state (it does nothing for other states). It either shuts
244 * the read side or marks itself as closed. The buffer flags are updated to
245 * reflect the new state. If the stream interface has SI_FL_NOHALF, we also
246 * forward the close to the write side. The owner task is woken up if it exists.
Willy Tarreau4a36b562012-08-06 19:31:45 +0200247 */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200248static void stream_int_shutr(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200249{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100250 struct channel *ic = si_ic(si);
251
252 ic->flags &= ~CF_SHUTR_NOW;
253 if (ic->flags & CF_SHUTR)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200254 return;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100255 ic->flags |= CF_SHUTR;
256 ic->rex = TICK_ETERNITY;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200257 si->flags &= ~SI_FL_WAIT_ROOM;
258
259 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200260 return;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200261
Willy Tarreau2bb4a962014-11-28 11:11:05 +0100262 if (si_oc(si)->flags & CF_SHUTW) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200263 si->state = SI_ST_DIS;
264 si->exp = TICK_ETERNITY;
Willy Tarreaud8ccffe2010-09-07 16:16:50 +0200265 }
Willy Tarreau4a36b562012-08-06 19:31:45 +0200266 else if (si->flags & SI_FL_NOHALF) {
267 /* we want to immediately forward this close to the write side */
268 return stream_int_shutw(si);
269 }
Willy Tarreau0bd05ea2010-07-02 11:18:03 +0200270
Willy Tarreau4a36b562012-08-06 19:31:45 +0200271 /* note that if the task exists, it must unregister itself once it runs */
Willy Tarreau07373b82014-11-28 12:08:47 +0100272 if (!(si->flags & SI_FL_DONT_WAKE))
273 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200274}
275
Willy Tarreau4a36b562012-08-06 19:31:45 +0200276/*
Willy Tarreaud45b9f82015-04-13 16:30:14 +0200277 * This function performs a shutdown-write on a detached stream interface in a
278 * connected or init state (it does nothing for other states). It either shuts
279 * the write side or marks itself as closed. The buffer flags are updated to
280 * reflect the new state. It does also close everything if the SI was marked as
281 * being in error state. The owner task is woken up if it exists.
Willy Tarreau4a36b562012-08-06 19:31:45 +0200282 */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200283static void stream_int_shutw(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200284{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100285 struct channel *ic = si_ic(si);
286 struct channel *oc = si_oc(si);
287
288 oc->flags &= ~CF_SHUTW_NOW;
289 if (oc->flags & CF_SHUTW)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200290 return;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100291 oc->flags |= CF_SHUTW;
292 oc->wex = TICK_ETERNITY;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200293 si->flags &= ~SI_FL_WAIT_DATA;
294
295 switch (si->state) {
296 case SI_ST_EST:
Willy Tarreau4a36b562012-08-06 19:31:45 +0200297 /* we have to shut before closing, otherwise some short messages
298 * may never leave the system, especially when there are remaining
299 * unread data in the socket input buffer, or when nolinger is set.
300 * However, if SI_FL_NOLINGER is explicitly set, we know there is
301 * no risk so we close both sides immediately.
302 */
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200303 if (!(si->flags & (SI_FL_ERR | SI_FL_NOLINGER)) &&
Willy Tarreauafc8a222014-11-28 15:46:27 +0100304 !(ic->flags & (CF_SHUTR|CF_DONT_READ)))
Willy Tarreau6fe15412013-09-29 15:16:03 +0200305 return;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200306
307 /* fall through */
308 case SI_ST_CON:
309 case SI_ST_CER:
Willy Tarreau32d3ee92010-12-29 14:03:02 +0100310 case SI_ST_QUE:
311 case SI_ST_TAR:
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200312 /* Note that none of these states may happen with applets */
Willy Tarreaufb90d942009-09-05 20:57:35 +0200313 si->state = SI_ST_DIS;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200314 default:
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200315 si->flags &= ~(SI_FL_WAIT_ROOM | SI_FL_NOLINGER);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100316 ic->flags &= ~CF_SHUTR_NOW;
317 ic->flags |= CF_SHUTR;
318 ic->rex = TICK_ETERNITY;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200319 si->exp = TICK_ETERNITY;
320 }
321
Willy Tarreau4a36b562012-08-06 19:31:45 +0200322 /* note that if the task exists, it must unregister itself once it runs */
Willy Tarreau07373b82014-11-28 12:08:47 +0100323 if (!(si->flags & SI_FL_DONT_WAKE))
324 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200325}
326
327/* default chk_rcv function for scheduled tasks */
Willy Tarreauf873d752012-05-11 17:47:17 +0200328static void stream_int_chk_rcv(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200329{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100330 struct channel *ic = si_ic(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200331
Willy Tarreauafc8a222014-11-28 15:46:27 +0100332 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
Willy Tarreaufb90d942009-09-05 20:57:35 +0200333 __FUNCTION__,
Willy Tarreauafc8a222014-11-28 15:46:27 +0100334 si, si->state, ic->flags, si_oc(si)->flags);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200335
Willy Tarreauafc8a222014-11-28 15:46:27 +0100336 if (unlikely(si->state != SI_ST_EST || (ic->flags & (CF_SHUTR|CF_DONT_READ))))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200337 return;
338
Willy Tarreauafc8a222014-11-28 15:46:27 +0100339 if (!channel_may_recv(ic) || ic->pipe) {
Willy Tarreaufb90d942009-09-05 20:57:35 +0200340 /* stop reading */
Willy Tarreau3bf1b2b2012-08-27 20:46:07 +0200341 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreaufb90d942009-09-05 20:57:35 +0200342 }
343 else {
344 /* (re)start reading */
345 si->flags &= ~SI_FL_WAIT_ROOM;
Willy Tarreau07373b82014-11-28 12:08:47 +0100346 if (!(si->flags & SI_FL_DONT_WAKE))
347 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200348 }
349}
350
351/* default chk_snd function for scheduled tasks */
Willy Tarreauf873d752012-05-11 17:47:17 +0200352static void stream_int_chk_snd(struct stream_interface *si)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200353{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100354 struct channel *oc = si_oc(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200355
Willy Tarreauafc8a222014-11-28 15:46:27 +0100356 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
Willy Tarreaufb90d942009-09-05 20:57:35 +0200357 __FUNCTION__,
Willy Tarreauafc8a222014-11-28 15:46:27 +0100358 si, si->state, si_ic(si)->flags, oc->flags);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200359
Willy Tarreauafc8a222014-11-28 15:46:27 +0100360 if (unlikely(si->state != SI_ST_EST || (oc->flags & CF_SHUTW)))
Willy Tarreaufb90d942009-09-05 20:57:35 +0200361 return;
362
363 if (!(si->flags & SI_FL_WAIT_DATA) || /* not waiting for data */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100364 channel_is_empty(oc)) /* called with nothing to send ! */
Willy Tarreaufb90d942009-09-05 20:57:35 +0200365 return;
366
367 /* Otherwise there are remaining data to be sent in the buffer,
368 * so we tell the handler.
369 */
370 si->flags &= ~SI_FL_WAIT_DATA;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100371 if (!tick_isset(oc->wex))
372 oc->wex = tick_add_ifset(now_ms, oc->wto);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200373
Willy Tarreau07373b82014-11-28 12:08:47 +0100374 if (!(si->flags & SI_FL_DONT_WAKE))
375 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200376}
377
Willy Tarreau1fbe1c92013-12-01 09:35:41 +0100378/* Register an applet to handle a stream_interface as part of the
379 * stream interface's owner task. The SI will wake it up everytime it
380 * is solicited. The task's processing function must call the applet's
381 * function before returning. It must be deleted by the task handler
382 * using stream_int_unregister_handler(), possibly from within the
383 * function itself. It also pre-initializes the applet's context and
384 * returns it (or NULL in case it could not be allocated).
Willy Tarreaufb90d942009-09-05 20:57:35 +0200385 */
Willy Tarreau30576452015-04-13 13:50:30 +0200386struct appctx *stream_int_register_handler(struct stream_interface *si, struct applet *app)
Willy Tarreaufb90d942009-09-05 20:57:35 +0200387{
Willy Tarreau0a23bcb2013-12-01 11:31:38 +0100388 struct appctx *appctx;
389
Willy Tarreau07373b82014-11-28 12:08:47 +0100390 DPRINTF(stderr, "registering handler %p for si %p (was %p)\n", app, si, si_task(si));
Willy Tarreaufb90d942009-09-05 20:57:35 +0200391
Willy Tarreaua7513f52015-04-05 00:15:26 +0200392 appctx = si_alloc_appctx(si, app);
Willy Tarreaua69fc9f2014-12-22 19:34:00 +0100393 if (!appctx)
Willy Tarreau0a23bcb2013-12-01 11:31:38 +0100394 return NULL;
395
Willy Tarreaufb90d942009-09-05 20:57:35 +0200396 si->flags |= SI_FL_WAIT_DATA;
Willy Tarreau1fbe1c92013-12-01 09:35:41 +0100397 return si_appctx(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200398}
399
Willy Tarreaufb90d942009-09-05 20:57:35 +0200400/* Unregister a stream interface handler. This must be called by the handler task
Willy Tarreau128b03c2012-11-11 23:14:16 +0100401 * itself when it detects that it is in the SI_ST_DIS state.
Willy Tarreaufb90d942009-09-05 20:57:35 +0200402 */
403void stream_int_unregister_handler(struct stream_interface *si)
404{
Willy Tarreau32e3c6a2013-10-11 19:34:20 +0200405 si_detach(si);
Willy Tarreaufb90d942009-09-05 20:57:35 +0200406}
407
Willy Tarreau2c6be842012-07-06 17:12:34 +0200408/* This callback is used to send a valid PROXY protocol line to a socket being
Willy Tarreauafad0e02012-08-09 14:45:22 +0200409 * established. It returns 0 if it fails in a fatal way or needs to poll to go
410 * further, otherwise it returns non-zero and removes itself from the connection's
Willy Tarreaua1a74742012-08-24 12:14:49 +0200411 * flags (the bit is provided in <flag> by the caller). It is designed to be
412 * called by the connection handler and relies on it to commit polling changes.
Willy Tarreau57cd3e42013-10-24 22:01:26 +0200413 * Note that it can emit a PROXY line by relying on the other end's address
414 * when the connection is attached to a stream interface, or by resolving the
415 * local address otherwise (also called a LOCAL line).
Willy Tarreau2c6be842012-07-06 17:12:34 +0200416 */
417int conn_si_send_proxy(struct connection *conn, unsigned int flag)
418{
Willy Tarreau2c6be842012-07-06 17:12:34 +0200419 /* we might have been called just after an asynchronous shutw */
Willy Tarreaua1a74742012-08-24 12:14:49 +0200420 if (conn->flags & CO_FL_SOCK_WR_SH)
Willy Tarreau2c6be842012-07-06 17:12:34 +0200421 goto out_error;
422
Willy Tarreaud02cdd22013-12-15 10:23:20 +0100423 if (!conn_ctrl_ready(conn))
Willy Tarreauf79c8172013-10-21 16:30:56 +0200424 goto out_error;
425
Willy Tarreau2c6be842012-07-06 17:12:34 +0200426 /* If we have a PROXY line to send, we'll use this to validate the
427 * connection, in which case the connection is validated only once
428 * we've sent the whole proxy line. Otherwise we use connect().
429 */
Willy Tarreaub8020ce2013-10-24 21:10:08 +0200430 while (conn->send_proxy_ofs) {
Willy Tarreau2c6be842012-07-06 17:12:34 +0200431 int ret;
432
433 /* The target server expects a PROXY line to be sent first.
434 * If the send_proxy_ofs is negative, it corresponds to the
435 * offset to start sending from then end of the proxy string
436 * (which is recomputed every time since it's constant). If
437 * it is positive, it means we have to send from the start.
Willy Tarreau57cd3e42013-10-24 22:01:26 +0200438 * We can only send a "normal" PROXY line when the connection
439 * is attached to a stream interface. Otherwise we can only
440 * send a LOCAL line (eg: for use with health checks).
Willy Tarreau2c6be842012-07-06 17:12:34 +0200441 */
Willy Tarreau57cd3e42013-10-24 22:01:26 +0200442 if (conn->data == &si_conn_cb) {
443 struct stream_interface *si = conn->owner;
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100444 struct connection *remote = objt_conn(si_opposite(si)->end);
David Safb76832014-05-08 23:42:08 -0400445 ret = make_proxy_line(trash.str, trash.size, objt_server(conn->target), remote);
Willy Tarreau57cd3e42013-10-24 22:01:26 +0200446 }
447 else {
448 /* The target server expects a LOCAL line to be sent first. Retrieving
449 * local or remote addresses may fail until the connection is established.
450 */
451 conn_get_from_addr(conn);
452 if (!(conn->flags & CO_FL_ADDR_FROM_SET))
453 goto out_wait;
454
455 conn_get_to_addr(conn);
456 if (!(conn->flags & CO_FL_ADDR_TO_SET))
457 goto out_wait;
458
David Safb76832014-05-08 23:42:08 -0400459 ret = make_proxy_line(trash.str, trash.size, objt_server(conn->target), conn);
Willy Tarreau57cd3e42013-10-24 22:01:26 +0200460 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200461
Willy Tarreau2c6be842012-07-06 17:12:34 +0200462 if (!ret)
463 goto out_error;
464
Willy Tarreaub8020ce2013-10-24 21:10:08 +0200465 if (conn->send_proxy_ofs > 0)
466 conn->send_proxy_ofs = -ret; /* first call */
Willy Tarreau2c6be842012-07-06 17:12:34 +0200467
Willy Tarreaua1a74742012-08-24 12:14:49 +0200468 /* we have to send trash from (ret+sp for -sp bytes). If the
469 * data layer has a pending write, we'll also set MSG_MORE.
470 */
Willy Tarreau0a03c0f2015-03-13 00:05:28 +0100471 ret = conn_sock_send(conn, trash.str + ret + conn->send_proxy_ofs, -conn->send_proxy_ofs,
472 (conn->flags & CO_FL_DATA_WR_ENA) ? MSG_MORE : 0);
Willy Tarreau2c6be842012-07-06 17:12:34 +0200473
Willy Tarreau0a03c0f2015-03-13 00:05:28 +0100474 if (ret < 0)
Willy Tarreau2c6be842012-07-06 17:12:34 +0200475 goto out_error;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200476
Willy Tarreaub8020ce2013-10-24 21:10:08 +0200477 conn->send_proxy_ofs += ret; /* becomes zero once complete */
478 if (conn->send_proxy_ofs != 0)
Willy Tarreau2c6be842012-07-06 17:12:34 +0200479 goto out_wait;
480
481 /* OK we've sent the whole line, we're connected */
Willy Tarreau7fe45692013-12-04 23:37:56 +0100482 break;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200483 }
484
Willy Tarreaua1a74742012-08-24 12:14:49 +0200485 /* The connection is ready now, simply return and let the connection
486 * handler notify upper layers if needed.
Willy Tarreau2c6be842012-07-06 17:12:34 +0200487 */
488 if (conn->flags & CO_FL_WAIT_L4_CONN)
489 conn->flags &= ~CO_FL_WAIT_L4_CONN;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200490 conn->flags &= ~flag;
Willy Tarreauafad0e02012-08-09 14:45:22 +0200491 return 1;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200492
493 out_error:
Willy Tarreauafad0e02012-08-09 14:45:22 +0200494 /* Write error on the file descriptor */
Willy Tarreau2c6be842012-07-06 17:12:34 +0200495 conn->flags |= CO_FL_ERROR;
Willy Tarreauafad0e02012-08-09 14:45:22 +0200496 return 0;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200497
498 out_wait:
Willy Tarreaua1a74742012-08-24 12:14:49 +0200499 __conn_sock_stop_recv(conn);
Willy Tarreauafad0e02012-08-09 14:45:22 +0200500 return 0;
Willy Tarreau2c6be842012-07-06 17:12:34 +0200501}
502
Willy Tarreau27375622013-12-17 00:00:28 +0100503
504/* Tiny I/O callback called on recv/send I/O events on idle connections.
505 * It simply sets the CO_FL_SOCK_RD_SH flag so that si_idle_conn_wake_cb()
506 * is notified and can kill the connection.
507 */
508static void si_idle_conn_null_cb(struct connection *conn)
509{
Willy Tarreaud85c4852015-03-13 00:40:28 +0100510 conn_sock_drain(conn);
Willy Tarreau27375622013-12-17 00:00:28 +0100511}
512
513/* Callback to be used by connection I/O handlers when some activity is detected
514 * on an idle server connection. Its main purpose is to kill the connection once
515 * a close was detected on it. It returns 0 if it did nothing serious, or -1 if
516 * it killed the connection.
517 */
518static int si_idle_conn_wake_cb(struct connection *conn)
519{
520 struct stream_interface *si = conn->owner;
521
522 if (!conn_ctrl_ready(conn))
523 return 0;
524
525 if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH)) {
526 /* warning, we can't do anything on <conn> after this call ! */
527 conn_force_close(conn);
528 conn_free(conn);
529 si->end = NULL;
530 return -1;
531 }
532 return 0;
533}
534
Willy Tarreau100c4672012-08-20 12:06:26 +0200535/* Callback to be used by connection I/O handlers upon completion. It differs from
Willy Tarreau4aa36832012-10-02 20:07:22 +0200536 * the update function in that it is designed to be called by lower layers after I/O
Willy Tarreau100c4672012-08-20 12:06:26 +0200537 * events have been completed. It will also try to wake the associated task up if
Willy Tarreauf16723e2012-08-24 12:52:22 +0200538 * an important event requires special handling. It relies on the connection handler
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200539 * to commit any polling updates. The function always returns 0.
Willy Tarreau100c4672012-08-20 12:06:26 +0200540 */
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200541static int si_conn_wake_cb(struct connection *conn)
Willy Tarreaufd31e532012-07-23 18:24:25 +0200542{
Willy Tarreaue603e692012-09-27 22:20:41 +0200543 struct stream_interface *si = conn->owner;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100544 struct channel *ic = si_ic(si);
545 struct channel *oc = si_oc(si);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200546
Willy Tarreauafc8a222014-11-28 15:46:27 +0100547 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
Willy Tarreaufd31e532012-07-23 18:24:25 +0200548 __FUNCTION__,
Willy Tarreauafc8a222014-11-28 15:46:27 +0100549 si, si->state, ic->flags, oc->flags);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200550
Willy Tarreau3c55ec22012-07-23 19:19:51 +0200551 if (conn->flags & CO_FL_ERROR)
552 si->flags |= SI_FL_ERR;
553
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200554 /* check for recent connection establishment */
Willy Tarreauc76ae332012-07-12 15:32:13 +0200555 if (unlikely(!(conn->flags & (CO_FL_WAIT_L4_CONN | CO_FL_WAIT_L6_CONN | CO_FL_CONNECTED)))) {
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200556 si->exp = TICK_ETERNITY;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100557 oc->flags |= CF_WRITE_NULL;
Willy Tarreau8f8c92f2012-07-23 19:45:44 +0200558 }
559
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200560 /* process consumer side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100561 if (channel_is_empty(oc)) {
562 if (((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW) &&
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200563 (si->state == SI_ST_EST))
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200564 stream_int_shutw_conn(si);
Willy Tarreauf16723e2012-08-24 12:52:22 +0200565 __conn_data_stop_send(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100566 oc->wex = TICK_ETERNITY;
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200567 }
Willy Tarreaufd31e532012-07-23 18:24:25 +0200568
Willy Tarreauafc8a222014-11-28 15:46:27 +0100569 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && channel_may_recv(oc))
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200570 si->flags |= SI_FL_WAIT_DATA;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200571
Willy Tarreauafc8a222014-11-28 15:46:27 +0100572 if (oc->flags & CF_WRITE_ACTIVITY) {
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200573 /* update timeouts if we have written something */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100574 if ((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
575 !channel_is_empty(oc))
576 if (tick_isset(oc->wex))
577 oc->wex = tick_add_ifset(now_ms, oc->wto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200578
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200579 if (!(si->flags & SI_FL_INDEP_STR))
Willy Tarreauafc8a222014-11-28 15:46:27 +0100580 if (tick_isset(ic->rex))
581 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200582
Willy Tarreauafc8a222014-11-28 15:46:27 +0100583 if (likely((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
584 channel_may_recv(oc) &&
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100585 (si_opposite(si)->flags & SI_FL_WAIT_ROOM)))
586 si_chk_rcv(si_opposite(si));
Willy Tarreaufd31e532012-07-23 18:24:25 +0200587 }
588
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200589 /* process producer side.
590 * We might have some data the consumer is waiting for.
591 * We can do fast-forwarding, but we avoid doing this for partial
592 * buffers, because it is very likely that it will be done again
593 * immediately afterwards once the following data is parsed (eg:
594 * HTTP chunking).
595 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100596 if (((ic->flags & CF_READ_PARTIAL) && !channel_is_empty(ic)) &&
597 (ic->pipe /* always try to send spliced data */ ||
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100598 (si_ib(si)->i == 0 && (si_opposite(si)->flags & SI_FL_WAIT_DATA)))) {
Willy Tarreauafc8a222014-11-28 15:46:27 +0100599 int last_len = ic->pipe ? ic->pipe->data : 0;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200600
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100601 si_chk_snd(si_opposite(si));
Willy Tarreaufd31e532012-07-23 18:24:25 +0200602
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200603 /* check if the consumer has freed some space either in the
604 * buffer or in the pipe.
605 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100606 if (channel_may_recv(ic) &&
607 (!last_len || !ic->pipe || ic->pipe->data < last_len))
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200608 si->flags &= ~SI_FL_WAIT_ROOM;
609 }
Willy Tarreaufd31e532012-07-23 18:24:25 +0200610
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200611 if (si->flags & SI_FL_WAIT_ROOM) {
Willy Tarreauf16723e2012-08-24 12:52:22 +0200612 __conn_data_stop_recv(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100613 ic->rex = TICK_ETERNITY;
Willy Tarreau44b5dc62012-08-24 12:12:53 +0200614 }
Willy Tarreauafc8a222014-11-28 15:46:27 +0100615 else if ((ic->flags & (CF_SHUTR|CF_READ_PARTIAL|CF_DONT_READ)) == CF_READ_PARTIAL &&
616 channel_may_recv(ic)) {
Willy Tarreau9f7c6a12012-11-19 16:43:14 +0100617 /* we must re-enable reading if si_chk_snd() has freed some space */
618 __conn_data_want_recv(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100619 if (!(ic->flags & CF_READ_NOEXP) && tick_isset(ic->rex))
620 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200621 }
622
623 /* wake the task up only when needed */
624 if (/* changes on the production side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100625 (ic->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
Willy Tarreaufd31e532012-07-23 18:24:25 +0200626 si->state != SI_ST_EST ||
627 (si->flags & SI_FL_ERR) ||
Willy Tarreauafc8a222014-11-28 15:46:27 +0100628 ((ic->flags & CF_READ_PARTIAL) &&
629 (!ic->to_forward || si_opposite(si)->state != SI_ST_EST)) ||
Willy Tarreaufd31e532012-07-23 18:24:25 +0200630
631 /* changes on the consumption side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100632 (oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
633 ((oc->flags & CF_WRITE_ACTIVITY) &&
634 ((oc->flags & CF_SHUTW) ||
635 ((oc->flags & CF_WAKE_WRITE) &&
Willy Tarreau50fe03b2014-11-28 13:59:31 +0100636 (si_opposite(si)->state != SI_ST_EST ||
Willy Tarreauafc8a222014-11-28 15:46:27 +0100637 (channel_is_empty(oc) && !oc->to_forward)))))) {
Willy Tarreau07373b82014-11-28 12:08:47 +0100638 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaufd31e532012-07-23 18:24:25 +0200639 }
Willy Tarreauafc8a222014-11-28 15:46:27 +0100640 if (ic->flags & CF_READ_ACTIVITY)
641 ic->flags &= ~CF_READ_DONTWAIT;
Willy Tarreau10fc09e2014-11-25 19:46:36 +0100642
Willy Tarreau87b09662015-04-03 00:22:06 +0200643 stream_release_buffers(si_strm(si));
Willy Tarreau2396c1c2012-10-03 21:12:16 +0200644 return 0;
Willy Tarreaufd31e532012-07-23 18:24:25 +0200645}
Willy Tarreau2c6be842012-07-06 17:12:34 +0200646
Willy Tarreau5368d802012-08-21 18:22:06 +0200647/*
648 * This function is called to send buffer data to a stream socket.
Godbache68e02d2013-10-11 15:48:29 +0800649 * It calls the transport layer's snd_buf function. It relies on the
Godbach4f489902013-12-04 17:24:06 +0800650 * caller to commit polling changes. The caller should check conn->flags
651 * for errors.
Willy Tarreau5368d802012-08-21 18:22:06 +0200652 */
Godbach4f489902013-12-04 17:24:06 +0800653static void si_conn_send(struct connection *conn)
Willy Tarreau5368d802012-08-21 18:22:06 +0200654{
Willy Tarreaue603e692012-09-27 22:20:41 +0200655 struct stream_interface *si = conn->owner;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100656 struct channel *oc = si_oc(si);
Willy Tarreau5368d802012-08-21 18:22:06 +0200657 int ret;
658
Willy Tarreauafc8a222014-11-28 15:46:27 +0100659 if (oc->pipe && conn->xprt->snd_pipe) {
660 ret = conn->xprt->snd_pipe(conn, oc->pipe);
Willy Tarreau96199b12012-08-24 00:46:52 +0200661 if (ret > 0)
Willy Tarreauafc8a222014-11-28 15:46:27 +0100662 oc->flags |= CF_WRITE_PARTIAL | CF_WROTE_DATA;
Willy Tarreau5368d802012-08-21 18:22:06 +0200663
Willy Tarreauafc8a222014-11-28 15:46:27 +0100664 if (!oc->pipe->data) {
665 put_pipe(oc->pipe);
666 oc->pipe = NULL;
Willy Tarreau5368d802012-08-21 18:22:06 +0200667 }
668
Willy Tarreau96199b12012-08-24 00:46:52 +0200669 if (conn->flags & CO_FL_ERROR)
Godbach4f489902013-12-04 17:24:06 +0800670 return;
Willy Tarreau5368d802012-08-21 18:22:06 +0200671 }
672
673 /* At this point, the pipe is empty, but we may still have data pending
674 * in the normal buffer.
675 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100676 if (!oc->buf->o)
Godbach4f489902013-12-04 17:24:06 +0800677 return;
Willy Tarreau5368d802012-08-21 18:22:06 +0200678
Godbache68e02d2013-10-11 15:48:29 +0800679 /* when we're here, we already know that there is no spliced
Willy Tarreau5368d802012-08-21 18:22:06 +0200680 * data left, and that there are sendable buffered data.
681 */
Willy Tarreau310987a2014-01-22 19:46:33 +0100682 if (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_DATA_WR_SH | CO_FL_WAIT_DATA | CO_FL_HANDSHAKE))) {
Willy Tarreau5368d802012-08-21 18:22:06 +0200683 /* check if we want to inform the kernel that we're interested in
684 * sending more data after this call. We want this if :
685 * - we're about to close after this last send and want to merge
686 * the ongoing FIN with the last segment.
687 * - we know we can't send everything at once and must get back
688 * here because of unaligned data
689 * - there is still a finite amount of data to forward
690 * The test is arranged so that the most common case does only 2
691 * tests.
692 */
Willy Tarreau1049b1f2014-02-02 01:51:17 +0100693 unsigned int send_flag = 0;
Willy Tarreau5368d802012-08-21 18:22:06 +0200694
Willy Tarreauafc8a222014-11-28 15:46:27 +0100695 if ((!(oc->flags & (CF_NEVER_WAIT|CF_SEND_DONTWAIT)) &&
696 ((oc->to_forward && oc->to_forward != CHN_INFINITE_FORWARD) ||
697 (oc->flags & CF_EXPECT_MORE))) ||
698 ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW))
Willy Tarreau1049b1f2014-02-02 01:51:17 +0100699 send_flag |= CO_SFL_MSG_MORE;
Willy Tarreau5368d802012-08-21 18:22:06 +0200700
Willy Tarreauafc8a222014-11-28 15:46:27 +0100701 if (oc->flags & CF_STREAMER)
Willy Tarreau7bed9452014-02-02 02:00:24 +0100702 send_flag |= CO_SFL_STREAMER;
703
Willy Tarreauafc8a222014-11-28 15:46:27 +0100704 ret = conn->xprt->snd_buf(conn, oc->buf, send_flag);
Godbache68e02d2013-10-11 15:48:29 +0800705 if (ret > 0) {
Willy Tarreauafc8a222014-11-28 15:46:27 +0100706 oc->flags |= CF_WRITE_PARTIAL | CF_WROTE_DATA;
Willy Tarreau5368d802012-08-21 18:22:06 +0200707
Willy Tarreauafc8a222014-11-28 15:46:27 +0100708 if (!oc->buf->o) {
Godbache68e02d2013-10-11 15:48:29 +0800709 /* Always clear both flags once everything has been sent, they're one-shot */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100710 oc->flags &= ~(CF_EXPECT_MORE | CF_SEND_DONTWAIT);
Godbache68e02d2013-10-11 15:48:29 +0800711 }
Willy Tarreau5368d802012-08-21 18:22:06 +0200712
Godbache68e02d2013-10-11 15:48:29 +0800713 /* if some data remain in the buffer, it's only because the
714 * system buffers are full, we will try next time.
715 */
Willy Tarreau5368d802012-08-21 18:22:06 +0200716 }
Godbache68e02d2013-10-11 15:48:29 +0800717 }
Willy Tarreau5368d802012-08-21 18:22:06 +0200718}
719
720
Willy Tarreau100c4672012-08-20 12:06:26 +0200721/* Updates the timers and flags of a stream interface attached to a connection,
722 * depending on the buffers' flags. It should only be called once after the
723 * buffer flags have settled down, and before they are cleared. It doesn't
724 * harm to call it as often as desired (it just slightly hurts performance).
725 * It is only meant to be called by upper layers after buffer flags have been
726 * manipulated by analysers.
727 */
728void stream_int_update_conn(struct stream_interface *si)
729{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100730 struct channel *ic = si_ic(si);
731 struct channel *oc = si_oc(si);
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200732 struct connection *conn = __objt_conn(si->end);
Willy Tarreau100c4672012-08-20 12:06:26 +0200733
Willy Tarreau100c4672012-08-20 12:06:26 +0200734 /* Check if we need to close the read side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100735 if (!(ic->flags & CF_SHUTR)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200736 /* Read not closed, update FD status and timeout for reads */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100737 if ((ic->flags & CF_DONT_READ) || !channel_may_recv(ic)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200738 /* stop reading */
739 if (!(si->flags & SI_FL_WAIT_ROOM)) {
Willy Tarreauafc8a222014-11-28 15:46:27 +0100740 if (!(ic->flags & CF_DONT_READ)) /* full */
Willy Tarreau100c4672012-08-20 12:06:26 +0200741 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200742 conn_data_stop_recv(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100743 ic->rex = TICK_ETERNITY;
Willy Tarreau100c4672012-08-20 12:06:26 +0200744 }
745 }
746 else {
747 /* (re)start reading and update timeout. Note: we don't recompute the timeout
748 * everytime we get here, otherwise it would risk never to expire. We only
749 * update it if is was not yet set. The stream socket handler will already
750 * have updated it if there has been a completed I/O.
751 */
752 si->flags &= ~SI_FL_WAIT_ROOM;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200753 conn_data_want_recv(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100754 if (!(ic->flags & (CF_READ_NOEXP|CF_DONT_READ)) && !tick_isset(ic->rex))
755 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreau100c4672012-08-20 12:06:26 +0200756 }
757 }
758
759 /* Check if we need to close the write side */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100760 if (!(oc->flags & CF_SHUTW)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200761 /* Write not closed, update FD status and timeout for writes */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100762 if (channel_is_empty(oc)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200763 /* stop writing */
764 if (!(si->flags & SI_FL_WAIT_DATA)) {
Willy Tarreauafc8a222014-11-28 15:46:27 +0100765 if ((oc->flags & CF_SHUTW_NOW) == 0)
Willy Tarreau100c4672012-08-20 12:06:26 +0200766 si->flags |= SI_FL_WAIT_DATA;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200767 conn_data_stop_send(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100768 oc->wex = TICK_ETERNITY;
Willy Tarreau100c4672012-08-20 12:06:26 +0200769 }
770 }
771 else {
772 /* (re)start writing and update timeout. Note: we don't recompute the timeout
773 * everytime we get here, otherwise it would risk never to expire. We only
774 * update it if is was not yet set. The stream socket handler will already
775 * have updated it if there has been a completed I/O.
776 */
777 si->flags &= ~SI_FL_WAIT_DATA;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200778 conn_data_want_send(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100779 if (!tick_isset(oc->wex)) {
780 oc->wex = tick_add_ifset(now_ms, oc->wto);
781 if (tick_isset(ic->rex) && !(si->flags & SI_FL_INDEP_STR)) {
Willy Tarreau100c4672012-08-20 12:06:26 +0200782 /* Note: depending on the protocol, we don't know if we're waiting
783 * for incoming data or not. So in order to prevent the socket from
784 * expiring read timeouts during writes, we refresh the read timeout,
785 * except if it was already infinite or if we have explicitly setup
786 * independent streams.
787 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100788 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreau100c4672012-08-20 12:06:26 +0200789 }
790 }
791 }
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200792 }
793}
794
795/*
796 * This function performs a shutdown-read on a stream interface attached to
797 * a connection in a connected or init state (it does nothing for other
798 * states). It either shuts the read side or marks itself as closed. The buffer
799 * flags are updated to reflect the new state. If the stream interface has
800 * SI_FL_NOHALF, we also forward the close to the write side. If a control
801 * layer is defined, then it is supposed to be a socket layer and file
Willy Tarreau6fe15412013-09-29 15:16:03 +0200802 * descriptors are then shutdown or closed accordingly. The function
803 * automatically disables polling if needed.
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200804 */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200805static void stream_int_shutr_conn(struct stream_interface *si)
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200806{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200807 struct connection *conn = __objt_conn(si->end);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100808 struct channel *ic = si_ic(si);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200809
Willy Tarreauafc8a222014-11-28 15:46:27 +0100810 ic->flags &= ~CF_SHUTR_NOW;
811 if (ic->flags & CF_SHUTR)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200812 return;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100813 ic->flags |= CF_SHUTR;
814 ic->rex = TICK_ETERNITY;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200815 si->flags &= ~SI_FL_WAIT_ROOM;
816
817 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200818 return;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200819
Willy Tarreau2bb4a962014-11-28 11:11:05 +0100820 if (si_oc(si)->flags & CF_SHUTW) {
Willy Tarreau6fe15412013-09-29 15:16:03 +0200821 conn_full_close(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200822 si->state = SI_ST_DIS;
823 si->exp = TICK_ETERNITY;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200824 }
825 else if (si->flags & SI_FL_NOHALF) {
826 /* we want to immediately forward this close to the write side */
827 return stream_int_shutw_conn(si);
828 }
829 else if (conn->ctrl) {
830 /* we want the caller to disable polling on this FD */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200831 conn_data_stop_recv(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200832 }
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200833}
834
835/*
836 * This function performs a shutdown-write on a stream interface attached to
837 * a connection in a connected or init state (it does nothing for other
838 * states). It either shuts the write side or marks itself as closed. The
839 * buffer flags are updated to reflect the new state. It does also close
840 * everything if the SI was marked as being in error state. If there is a
Willy Tarreau1398aa12015-03-12 23:04:07 +0100841 * data-layer shutdown, it is called.
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200842 */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200843static void stream_int_shutw_conn(struct stream_interface *si)
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200844{
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200845 struct connection *conn = __objt_conn(si->end);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100846 struct channel *ic = si_ic(si);
847 struct channel *oc = si_oc(si);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200848
Willy Tarreauafc8a222014-11-28 15:46:27 +0100849 oc->flags &= ~CF_SHUTW_NOW;
850 if (oc->flags & CF_SHUTW)
Willy Tarreau6fe15412013-09-29 15:16:03 +0200851 return;
Willy Tarreauafc8a222014-11-28 15:46:27 +0100852 oc->flags |= CF_SHUTW;
853 oc->wex = TICK_ETERNITY;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200854 si->flags &= ~SI_FL_WAIT_DATA;
855
856 switch (si->state) {
857 case SI_ST_EST:
858 /* we have to shut before closing, otherwise some short messages
859 * may never leave the system, especially when there are remaining
860 * unread data in the socket input buffer, or when nolinger is set.
861 * However, if SI_FL_NOLINGER is explicitly set, we know there is
862 * no risk so we close both sides immediately.
863 */
864 if (si->flags & SI_FL_ERR) {
865 /* quick close, the socket is alredy shut anyway */
866 }
867 else if (si->flags & SI_FL_NOLINGER) {
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200868 /* unclean data-layer shutdown */
Willy Tarreau1398aa12015-03-12 23:04:07 +0100869 conn_data_shutw_hard(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200870 }
871 else {
872 /* clean data-layer shutdown */
Willy Tarreau1398aa12015-03-12 23:04:07 +0100873 conn_data_shutw(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200874
875 /* If the stream interface is configured to disable half-open
876 * connections, we'll skip the shutdown(), but only if the
877 * read size is already closed. Otherwise we can't support
878 * closed write with pending read (eg: abortonclose while
879 * waiting for the server).
880 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100881 if (!(si->flags & SI_FL_NOHALF) || !(ic->flags & (CF_SHUTR|CF_DONT_READ))) {
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200882 /* We shutdown transport layer */
Willy Tarreau4dfd54f2015-03-12 22:44:53 +0100883 conn_sock_shutw(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200884
Willy Tarreauafc8a222014-11-28 15:46:27 +0100885 if (!(ic->flags & (CF_SHUTR|CF_DONT_READ))) {
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200886 /* OK just a shutw, but we want the caller
887 * to disable polling on this FD if exists.
888 */
Willy Tarreau1398aa12015-03-12 23:04:07 +0100889 conn_cond_update_polling(conn);
Willy Tarreau6fe15412013-09-29 15:16:03 +0200890 return;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200891 }
892 }
893 }
894
895 /* fall through */
896 case SI_ST_CON:
897 /* we may have to close a pending connection, and mark the
898 * response buffer as shutr
899 */
Willy Tarreau6fe15412013-09-29 15:16:03 +0200900 conn_full_close(conn);
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200901 /* fall through */
902 case SI_ST_CER:
903 case SI_ST_QUE:
904 case SI_ST_TAR:
905 si->state = SI_ST_DIS;
Willy Tarreau4a59f2f2013-10-24 20:10:45 +0200906 /* fall through */
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200907 default:
908 si->flags &= ~(SI_FL_WAIT_ROOM | SI_FL_NOLINGER);
Willy Tarreauafc8a222014-11-28 15:46:27 +0100909 ic->flags &= ~CF_SHUTR_NOW;
910 ic->flags |= CF_SHUTR;
911 ic->rex = TICK_ETERNITY;
Willy Tarreau8b3d7df2013-09-29 14:51:58 +0200912 si->exp = TICK_ETERNITY;
Willy Tarreau100c4672012-08-20 12:06:26 +0200913 }
914}
915
Willy Tarreau46a8d922012-08-20 12:38:36 +0200916/* This function is used for inter-stream-interface calls. It is called by the
917 * consumer to inform the producer side that it may be interested in checking
918 * for free space in the buffer. Note that it intentionally does not update
919 * timeouts, so that we can still check them later at wake-up. This function is
920 * dedicated to connection-based stream interfaces.
921 */
Willy Tarreauc5788912012-08-24 18:12:41 +0200922static void stream_int_chk_rcv_conn(struct stream_interface *si)
Willy Tarreau46a8d922012-08-20 12:38:36 +0200923{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100924 struct channel *ic = si_ic(si);
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200925 struct connection *conn = __objt_conn(si->end);
Willy Tarreau46a8d922012-08-20 12:38:36 +0200926
Willy Tarreauafc8a222014-11-28 15:46:27 +0100927 if (unlikely(si->state > SI_ST_EST || (ic->flags & CF_SHUTR)))
Willy Tarreau46a8d922012-08-20 12:38:36 +0200928 return;
929
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200930 conn_refresh_polling_flags(conn);
Willy Tarreau7d281492012-12-16 19:19:13 +0100931
Willy Tarreauafc8a222014-11-28 15:46:27 +0100932 if ((ic->flags & CF_DONT_READ) || !channel_may_recv(ic)) {
Willy Tarreau46a8d922012-08-20 12:38:36 +0200933 /* stop reading */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100934 if (!(ic->flags & CF_DONT_READ)) /* full */
Willy Tarreau46a8d922012-08-20 12:38:36 +0200935 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200936 __conn_data_stop_recv(conn);
Willy Tarreau46a8d922012-08-20 12:38:36 +0200937 }
938 else {
939 /* (re)start reading */
940 si->flags &= ~SI_FL_WAIT_ROOM;
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200941 __conn_data_want_recv(conn);
Willy Tarreau46a8d922012-08-20 12:38:36 +0200942 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200943 conn_cond_update_data_polling(conn);
Willy Tarreau46a8d922012-08-20 12:38:36 +0200944}
945
946
Willy Tarreaude5722c2012-08-20 15:01:10 +0200947/* This function is used for inter-stream-interface calls. It is called by the
948 * producer to inform the consumer side that it may be interested in checking
949 * for data in the buffer. Note that it intentionally does not update timeouts,
950 * so that we can still check them later at wake-up.
951 */
Willy Tarreauc5788912012-08-24 18:12:41 +0200952static void stream_int_chk_snd_conn(struct stream_interface *si)
Willy Tarreaude5722c2012-08-20 15:01:10 +0200953{
Willy Tarreauafc8a222014-11-28 15:46:27 +0100954 struct channel *oc = si_oc(si);
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200955 struct connection *conn = __objt_conn(si->end);
Willy Tarreaude5722c2012-08-20 15:01:10 +0200956
Willy Tarreauafc8a222014-11-28 15:46:27 +0100957 if (unlikely(si->state > SI_ST_EST || (oc->flags & CF_SHUTW)))
Willy Tarreaude5722c2012-08-20 15:01:10 +0200958 return;
Willy Tarreaude5722c2012-08-20 15:01:10 +0200959
Willy Tarreauafc8a222014-11-28 15:46:27 +0100960 if (unlikely(channel_is_empty(oc))) /* called with nothing to send ! */
Willy Tarreaude5722c2012-08-20 15:01:10 +0200961 return;
962
Willy Tarreauafc8a222014-11-28 15:46:27 +0100963 if (!oc->pipe && /* spliced data wants to be forwarded ASAP */
Willy Tarreaub0165872012-12-15 10:12:39 +0100964 !(si->flags & SI_FL_WAIT_DATA)) /* not waiting for data */
Willy Tarreaude5722c2012-08-20 15:01:10 +0200965 return;
966
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200967 if (conn->flags & (CO_FL_DATA_WR_ENA|CO_FL_CURR_WR_ENA)) {
Willy Tarreau5007d2a2013-07-18 22:09:48 +0200968 /* already subscribed to write notifications, will be called
969 * anyway, so let's avoid calling it especially if the reader
970 * is not ready.
971 */
972 return;
973 }
974
Willy Tarreau708e7172014-01-21 10:27:49 +0100975 /* Before calling the data-level operations, we have to prepare
976 * the polling flags to ensure we properly detect changes.
977 */
978 conn_refresh_polling_flags(conn);
979 __conn_data_want_send(conn);
Willy Tarreaud29a0662012-12-10 16:33:38 +0100980
Willy Tarreau708e7172014-01-21 10:27:49 +0100981 if (!(conn->flags & (CO_FL_HANDSHAKE|CO_FL_WAIT_L4_CONN|CO_FL_WAIT_L6_CONN))) {
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200982 si_conn_send(conn);
Willy Tarreau798c3c92014-01-21 10:30:08 +0100983 if (conn->flags & CO_FL_ERROR) {
Willy Tarreaud29a0662012-12-10 16:33:38 +0100984 /* Write error on the file descriptor */
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200985 __conn_data_stop_both(conn);
Willy Tarreaud29a0662012-12-10 16:33:38 +0100986 si->flags |= SI_FL_ERR;
Willy Tarreaud29a0662012-12-10 16:33:38 +0100987 goto out_wakeup;
988 }
Willy Tarreaude5722c2012-08-20 15:01:10 +0200989 }
990
991 /* OK, so now we know that some data might have been sent, and that we may
992 * have to poll first. We have to do that too if the buffer is not empty.
993 */
Willy Tarreauafc8a222014-11-28 15:46:27 +0100994 if (channel_is_empty(oc)) {
Willy Tarreaude5722c2012-08-20 15:01:10 +0200995 /* the connection is established but we can't write. Either the
996 * buffer is empty, or we just refrain from sending because the
997 * ->o limit was reached. Maybe we just wrote the last
998 * chunk and need to close.
999 */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001000 __conn_data_stop_send(conn);
Willy Tarreauafc8a222014-11-28 15:46:27 +01001001 if (((oc->flags & (CF_SHUTW|CF_AUTO_CLOSE|CF_SHUTW_NOW)) ==
Willy Tarreau03cdb7c2012-08-27 23:14:58 +02001002 (CF_AUTO_CLOSE|CF_SHUTW_NOW)) &&
Willy Tarreaude5722c2012-08-20 15:01:10 +02001003 (si->state == SI_ST_EST)) {
1004 si_shutw(si);
1005 goto out_wakeup;
1006 }
1007
Willy Tarreauafc8a222014-11-28 15:46:27 +01001008 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0)
Willy Tarreaude5722c2012-08-20 15:01:10 +02001009 si->flags |= SI_FL_WAIT_DATA;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001010 oc->wex = TICK_ETERNITY;
Willy Tarreaude5722c2012-08-20 15:01:10 +02001011 }
1012 else {
1013 /* Otherwise there are remaining data to be sent in the buffer,
1014 * which means we have to poll before doing so.
1015 */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001016 __conn_data_want_send(conn);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001017 si->flags &= ~SI_FL_WAIT_DATA;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001018 if (!tick_isset(oc->wex))
1019 oc->wex = tick_add_ifset(now_ms, oc->wto);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001020 }
1021
Willy Tarreauafc8a222014-11-28 15:46:27 +01001022 if (likely(oc->flags & CF_WRITE_ACTIVITY)) {
1023 struct channel *ic = si_ic(si);
1024
Willy Tarreaude5722c2012-08-20 15:01:10 +02001025 /* update timeout if we have written something */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001026 if ((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL)) == CF_WRITE_PARTIAL &&
1027 !channel_is_empty(oc))
1028 oc->wex = tick_add_ifset(now_ms, oc->wto);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001029
Willy Tarreauafc8a222014-11-28 15:46:27 +01001030 if (tick_isset(ic->rex) && !(si->flags & SI_FL_INDEP_STR)) {
Willy Tarreaude5722c2012-08-20 15:01:10 +02001031 /* Note: to prevent the client from expiring read timeouts
1032 * during writes, we refresh it. We only do this if the
1033 * interface is not configured for "independent streams",
1034 * because for some applications it's better not to do this,
1035 * for instance when continuously exchanging small amounts
1036 * of data which can full the socket buffers long before a
1037 * write timeout is detected.
1038 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001039 ic->rex = tick_add_ifset(now_ms, ic->rto);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001040 }
1041 }
1042
1043 /* in case of special condition (error, shutdown, end of write...), we
1044 * have to notify the task.
1045 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001046 if (likely((oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR|CF_SHUTW)) ||
1047 ((oc->flags & CF_WAKE_WRITE) &&
1048 ((channel_is_empty(oc) && !oc->to_forward) ||
Willy Tarreaue6300be2014-01-25 02:33:21 +01001049 si->state != SI_ST_EST)))) {
Willy Tarreaude5722c2012-08-20 15:01:10 +02001050 out_wakeup:
Willy Tarreau07373b82014-11-28 12:08:47 +01001051 if (!(si->flags & SI_FL_DONT_WAKE))
1052 task_wakeup(si_task(si), TASK_WOKEN_IO);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001053 }
Willy Tarreauf16723e2012-08-24 12:52:22 +02001054
1055 /* commit possible polling changes */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001056 conn_cond_update_polling(conn);
Willy Tarreaude5722c2012-08-20 15:01:10 +02001057}
1058
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001059/*
Willy Tarreauce323de2012-08-20 21:41:06 +02001060 * This is the callback which is called by the connection layer to receive data
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001061 * into the buffer from the connection. It iterates over the transport layer's
1062 * rcv_buf function.
Willy Tarreauce323de2012-08-20 21:41:06 +02001063 */
Willy Tarreau4aa36832012-10-02 20:07:22 +02001064static void si_conn_recv_cb(struct connection *conn)
Willy Tarreauce323de2012-08-20 21:41:06 +02001065{
Willy Tarreaue603e692012-09-27 22:20:41 +02001066 struct stream_interface *si = conn->owner;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001067 struct channel *ic = si_ic(si);
Willy Tarreauce323de2012-08-20 21:41:06 +02001068 int ret, max, cur_read;
1069 int read_poll = MAX_READ_POLL_LOOPS;
1070
1071 /* stop immediately on errors. Note that we DON'T want to stop on
1072 * POLL_ERR, as the poller might report a write error while there
1073 * are still data available in the recv buffer. This typically
1074 * happens when we send too large a request to a backend server
1075 * which rejects it before reading it all.
1076 */
1077 if (conn->flags & CO_FL_ERROR)
Godbach4f489902013-12-04 17:24:06 +08001078 return;
Willy Tarreauce323de2012-08-20 21:41:06 +02001079
1080 /* stop here if we reached the end of data */
1081 if (conn_data_read0_pending(conn))
1082 goto out_shutdown_r;
1083
1084 /* maybe we were called immediately after an asynchronous shutr */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001085 if (ic->flags & CF_SHUTR)
Willy Tarreauce323de2012-08-20 21:41:06 +02001086 return;
1087
Willy Tarreau96199b12012-08-24 00:46:52 +02001088 cur_read = 0;
Willy Tarreau96199b12012-08-24 00:46:52 +02001089
Willy Tarreauafc8a222014-11-28 15:46:27 +01001090 if ((ic->flags & (CF_STREAMER | CF_STREAMER_FAST)) && !ic->buf->o &&
Willy Tarreau7e312732014-02-12 16:35:14 +01001091 global.tune.idle_timer &&
Willy Tarreauafc8a222014-11-28 15:46:27 +01001092 (unsigned short)(now_ms - ic->last_read) >= global.tune.idle_timer) {
Willy Tarreauc5890e62014-02-09 17:47:01 +01001093 /* The buffer was empty and nothing was transferred for more
1094 * than one second. This was caused by a pause and not by
1095 * congestion. Reset any streaming mode to reduce latency.
1096 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001097 ic->xfer_small = 0;
1098 ic->xfer_large = 0;
1099 ic->flags &= ~(CF_STREAMER | CF_STREAMER_FAST);
Willy Tarreauc5890e62014-02-09 17:47:01 +01001100 }
1101
Willy Tarreau96199b12012-08-24 00:46:52 +02001102 /* First, let's see if we may splice data across the channel without
1103 * using a buffer.
1104 */
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001105 if (conn->xprt->rcv_pipe &&
Willy Tarreauafc8a222014-11-28 15:46:27 +01001106 (ic->pipe || ic->to_forward >= MIN_SPLICE_FORWARD) &&
1107 ic->flags & CF_KERN_SPLICING) {
1108 if (buffer_not_empty(ic->buf)) {
Willy Tarreau96199b12012-08-24 00:46:52 +02001109 /* We're embarrassed, there are already data pending in
1110 * the buffer and we don't want to have them at two
1111 * locations at a time. Let's indicate we need some
1112 * place and ask the consumer to hurry.
1113 */
1114 goto abort_splice;
1115 }
Willy Tarreauce323de2012-08-20 21:41:06 +02001116
Willy Tarreauafc8a222014-11-28 15:46:27 +01001117 if (unlikely(ic->pipe == NULL)) {
1118 if (pipes_used >= global.maxpipes || !(ic->pipe = get_pipe())) {
1119 ic->flags &= ~CF_KERN_SPLICING;
Willy Tarreau96199b12012-08-24 00:46:52 +02001120 goto abort_splice;
1121 }
1122 }
1123
Willy Tarreauafc8a222014-11-28 15:46:27 +01001124 ret = conn->xprt->rcv_pipe(conn, ic->pipe, ic->to_forward);
Willy Tarreau96199b12012-08-24 00:46:52 +02001125 if (ret < 0) {
1126 /* splice not supported on this end, let's disable it */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001127 ic->flags &= ~CF_KERN_SPLICING;
Willy Tarreau96199b12012-08-24 00:46:52 +02001128 goto abort_splice;
1129 }
Willy Tarreauce323de2012-08-20 21:41:06 +02001130
Willy Tarreau96199b12012-08-24 00:46:52 +02001131 if (ret > 0) {
Willy Tarreauafc8a222014-11-28 15:46:27 +01001132 if (ic->to_forward != CHN_INFINITE_FORWARD)
1133 ic->to_forward -= ret;
1134 ic->total += ret;
Willy Tarreau96199b12012-08-24 00:46:52 +02001135 cur_read += ret;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001136 ic->flags |= CF_READ_PARTIAL;
Willy Tarreauce323de2012-08-20 21:41:06 +02001137 }
Willy Tarreau96199b12012-08-24 00:46:52 +02001138
1139 if (conn_data_read0_pending(conn))
1140 goto out_shutdown_r;
1141
1142 if (conn->flags & CO_FL_ERROR)
Godbach4f489902013-12-04 17:24:06 +08001143 return;
Willy Tarreau96199b12012-08-24 00:46:52 +02001144
Willy Tarreau61d39a02013-07-18 21:49:32 +02001145 if (conn->flags & CO_FL_WAIT_ROOM) {
1146 /* the pipe is full or we have read enough data that it
1147 * could soon be full. Let's stop before needing to poll.
1148 */
Willy Tarreau56a77e52012-09-02 18:34:44 +02001149 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreau61d39a02013-07-18 21:49:32 +02001150 __conn_data_stop_recv(conn);
1151 }
Willy Tarreau56a77e52012-09-02 18:34:44 +02001152
Willy Tarreauce323de2012-08-20 21:41:06 +02001153 /* splice not possible (anymore), let's go on on standard copy */
1154 }
Willy Tarreau96199b12012-08-24 00:46:52 +02001155
1156 abort_splice:
Willy Tarreauafc8a222014-11-28 15:46:27 +01001157 if (ic->pipe && unlikely(!ic->pipe->data)) {
1158 put_pipe(ic->pipe);
1159 ic->pipe = NULL;
Willy Tarreau96199b12012-08-24 00:46:52 +02001160 }
1161
Willy Tarreau10fc09e2014-11-25 19:46:36 +01001162 /* now we'll need a buffer */
Willy Tarreau87b09662015-04-03 00:22:06 +02001163 if (!stream_alloc_recv_buffer(ic)) {
Willy Tarreau10fc09e2014-11-25 19:46:36 +01001164 si->flags |= SI_FL_WAIT_ROOM;
1165 goto end_recv;
1166 }
1167
Willy Tarreau61d39a02013-07-18 21:49:32 +02001168 /* Important note : if we're called with POLL_IN|POLL_HUP, it means the read polling
1169 * was enabled, which implies that the recv buffer was not full. So we have a guarantee
1170 * that if such an event is not handled above in splice, it will be handled here by
1171 * recv().
1172 */
Willy Tarreau310987a2014-01-22 19:46:33 +01001173 while (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_DATA_RD_SH | CO_FL_WAIT_ROOM | CO_FL_HANDSHAKE))) {
Willy Tarreauafc8a222014-11-28 15:46:27 +01001174 max = channel_recv_max(ic);
Willy Tarreauce323de2012-08-20 21:41:06 +02001175
1176 if (!max) {
Willy Tarreau56a77e52012-09-02 18:34:44 +02001177 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreauce323de2012-08-20 21:41:06 +02001178 break;
1179 }
1180
Willy Tarreauafc8a222014-11-28 15:46:27 +01001181 ret = conn->xprt->rcv_buf(conn, ic->buf, max);
Willy Tarreauce323de2012-08-20 21:41:06 +02001182 if (ret <= 0)
1183 break;
1184
1185 cur_read += ret;
1186
1187 /* if we're allowed to directly forward data, we must update ->o */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001188 if (ic->to_forward && !(ic->flags & (CF_SHUTW|CF_SHUTW_NOW))) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001189 unsigned long fwd = ret;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001190 if (ic->to_forward != CHN_INFINITE_FORWARD) {
1191 if (fwd > ic->to_forward)
1192 fwd = ic->to_forward;
1193 ic->to_forward -= fwd;
Willy Tarreauce323de2012-08-20 21:41:06 +02001194 }
Willy Tarreauafc8a222014-11-28 15:46:27 +01001195 b_adv(ic->buf, fwd);
Willy Tarreauce323de2012-08-20 21:41:06 +02001196 }
1197
Willy Tarreauafc8a222014-11-28 15:46:27 +01001198 ic->flags |= CF_READ_PARTIAL;
1199 ic->total += ret;
Willy Tarreauce323de2012-08-20 21:41:06 +02001200
Willy Tarreauafc8a222014-11-28 15:46:27 +01001201 if (!channel_may_recv(ic)) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001202 si->flags |= SI_FL_WAIT_ROOM;
1203 break;
1204 }
1205
Willy Tarreauafc8a222014-11-28 15:46:27 +01001206 if ((ic->flags & CF_READ_DONTWAIT) || --read_poll <= 0) {
Willy Tarreau34ac5662012-12-19 18:01:02 +01001207 si->flags |= SI_FL_WAIT_ROOM;
Willy Tarreaud486ef52012-12-10 17:03:52 +01001208 __conn_data_stop_recv(conn);
Willy Tarreauce323de2012-08-20 21:41:06 +02001209 break;
Willy Tarreau5fddab02012-11-09 18:27:26 +01001210 }
Willy Tarreauce323de2012-08-20 21:41:06 +02001211
1212 /* if too many bytes were missing from last read, it means that
1213 * it's pointless trying to read again because the system does
1214 * not have them in buffers.
1215 */
1216 if (ret < max) {
Willy Tarreauce323de2012-08-20 21:41:06 +02001217 /* if a streamer has read few data, it may be because we
1218 * have exhausted system buffers. It's not worth trying
1219 * again.
1220 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001221 if (ic->flags & CF_STREAMER)
Willy Tarreauce323de2012-08-20 21:41:06 +02001222 break;
1223
1224 /* if we read a large block smaller than what we requested,
1225 * it's almost certain we'll never get anything more.
1226 */
1227 if (ret >= global.tune.recv_enough)
1228 break;
1229 }
1230 } /* while !flags */
1231
Willy Tarreauc5890e62014-02-09 17:47:01 +01001232 if (cur_read) {
Willy Tarreauafc8a222014-11-28 15:46:27 +01001233 if ((ic->flags & (CF_STREAMER | CF_STREAMER_FAST)) &&
1234 (cur_read <= ic->buf->size / 2)) {
1235 ic->xfer_large = 0;
1236 ic->xfer_small++;
1237 if (ic->xfer_small >= 3) {
Willy Tarreauc5890e62014-02-09 17:47:01 +01001238 /* we have read less than half of the buffer in
1239 * one pass, and this happened at least 3 times.
1240 * This is definitely not a streamer.
1241 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001242 ic->flags &= ~(CF_STREAMER | CF_STREAMER_FAST);
Willy Tarreauc5890e62014-02-09 17:47:01 +01001243 }
Willy Tarreauafc8a222014-11-28 15:46:27 +01001244 else if (ic->xfer_small >= 2) {
Willy Tarreauc5890e62014-02-09 17:47:01 +01001245 /* if the buffer has been at least half full twice,
1246 * we receive faster than we send, so at least it
1247 * is not a "fast streamer".
1248 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001249 ic->flags &= ~CF_STREAMER_FAST;
Willy Tarreauc5890e62014-02-09 17:47:01 +01001250 }
1251 }
Willy Tarreauafc8a222014-11-28 15:46:27 +01001252 else if (!(ic->flags & CF_STREAMER_FAST) &&
1253 (cur_read >= ic->buf->size - global.tune.maxrewrite)) {
Willy Tarreauc5890e62014-02-09 17:47:01 +01001254 /* we read a full buffer at once */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001255 ic->xfer_small = 0;
1256 ic->xfer_large++;
1257 if (ic->xfer_large >= 3) {
Willy Tarreauc5890e62014-02-09 17:47:01 +01001258 /* we call this buffer a fast streamer if it manages
1259 * to be filled in one call 3 consecutive times.
1260 */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001261 ic->flags |= (CF_STREAMER | CF_STREAMER_FAST);
Willy Tarreauc5890e62014-02-09 17:47:01 +01001262 }
1263 }
1264 else {
Willy Tarreauafc8a222014-11-28 15:46:27 +01001265 ic->xfer_small = 0;
1266 ic->xfer_large = 0;
Willy Tarreauc5890e62014-02-09 17:47:01 +01001267 }
Willy Tarreauafc8a222014-11-28 15:46:27 +01001268 ic->last_read = now_ms;
Willy Tarreauc5890e62014-02-09 17:47:01 +01001269 }
1270
Willy Tarreau10fc09e2014-11-25 19:46:36 +01001271 end_recv:
1272 if (conn->flags & CO_FL_ERROR)
1273 return;
1274
Willy Tarreauce323de2012-08-20 21:41:06 +02001275 if (conn_data_read0_pending(conn))
1276 /* connection closed */
1277 goto out_shutdown_r;
1278
1279 return;
1280
1281 out_shutdown_r:
1282 /* we received a shutdown */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001283 ic->flags |= CF_READ_NULL;
1284 if (ic->flags & CF_AUTO_CLOSE)
1285 channel_shutw_now(ic);
Willy Tarreauce323de2012-08-20 21:41:06 +02001286 stream_sock_read0(si);
1287 conn_data_read0(conn);
1288 return;
Willy Tarreauce323de2012-08-20 21:41:06 +02001289}
1290
1291/*
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001292 * This is the callback which is called by the connection layer to send data
Willy Tarreauf7bc57c2012-10-03 00:19:48 +02001293 * from the buffer to the connection. It iterates over the transport layer's
1294 * snd_buf function.
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001295 */
Willy Tarreau4aa36832012-10-02 20:07:22 +02001296static void si_conn_send_cb(struct connection *conn)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001297{
Willy Tarreaue603e692012-09-27 22:20:41 +02001298 struct stream_interface *si = conn->owner;
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001299
1300 if (conn->flags & CO_FL_ERROR)
Godbach4f489902013-12-04 17:24:06 +08001301 return;
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001302
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001303 if (conn->flags & CO_FL_HANDSHAKE)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001304 /* a handshake was requested */
1305 return;
1306
1307 /* we might have been called just after an asynchronous shutw */
Willy Tarreauafc8a222014-11-28 15:46:27 +01001308 if (si_oc(si)->flags & CF_SHUTW)
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001309 return;
1310
1311 /* OK there are data waiting to be sent */
Godbach4f489902013-12-04 17:24:06 +08001312 si_conn_send(conn);
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001313
1314 /* OK all done */
1315 return;
Willy Tarreaueecf6ca2012-08-20 15:09:53 +02001316}
1317
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001318/*
1319 * This function propagates a null read received on a socket-based connection.
1320 * It updates the stream interface. If the stream interface has SI_FL_NOHALF,
Willy Tarreau11405122015-03-12 22:32:27 +01001321 * the close is also forwarded to the write side as an abort.
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001322 */
1323void stream_sock_read0(struct stream_interface *si)
1324{
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001325 struct connection *conn = __objt_conn(si->end);
Willy Tarreauafc8a222014-11-28 15:46:27 +01001326 struct channel *ic = si_ic(si);
1327 struct channel *oc = si_oc(si);
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001328
Willy Tarreauafc8a222014-11-28 15:46:27 +01001329 ic->flags &= ~CF_SHUTR_NOW;
1330 if (ic->flags & CF_SHUTR)
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001331 return;
Willy Tarreauafc8a222014-11-28 15:46:27 +01001332 ic->flags |= CF_SHUTR;
1333 ic->rex = TICK_ETERNITY;
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001334 si->flags &= ~SI_FL_WAIT_ROOM;
1335
1336 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
1337 return;
1338
Willy Tarreauafc8a222014-11-28 15:46:27 +01001339 if (oc->flags & CF_SHUTW)
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001340 goto do_close;
1341
1342 if (si->flags & SI_FL_NOHALF) {
1343 /* we want to immediately forward this close to the write side */
Willy Tarreau87b09662015-04-03 00:22:06 +02001344 /* force flag on ssl to keep stream in cache */
Willy Tarreau1398aa12015-03-12 23:04:07 +01001345 conn_data_shutw_hard(conn);
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001346 goto do_close;
1347 }
1348
1349 /* otherwise that's just a normal read shutdown */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001350 __conn_data_stop_recv(conn);
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001351 return;
1352
1353 do_close:
Willy Tarreauf9fbfe82012-11-21 21:51:53 +01001354 /* OK we completely close the socket here just as if we went through si_shut[rw]() */
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001355 conn_full_close(conn);
Willy Tarreauf9fbfe82012-11-21 21:51:53 +01001356
Willy Tarreauafc8a222014-11-28 15:46:27 +01001357 ic->flags &= ~CF_SHUTR_NOW;
1358 ic->flags |= CF_SHUTR;
1359 ic->rex = TICK_ETERNITY;
Willy Tarreauf9fbfe82012-11-21 21:51:53 +01001360
Willy Tarreauafc8a222014-11-28 15:46:27 +01001361 oc->flags &= ~CF_SHUTW_NOW;
1362 oc->flags |= CF_SHUTW;
1363 oc->wex = TICK_ETERNITY;
Willy Tarreauf9fbfe82012-11-21 21:51:53 +01001364
1365 si->flags &= ~(SI_FL_WAIT_DATA | SI_FL_WAIT_ROOM);
1366
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001367 si->state = SI_ST_DIS;
1368 si->exp = TICK_ETERNITY;
Willy Tarreau9bf9c142012-08-20 15:38:41 +02001369 return;
1370}
1371
Willy Tarreaud45b9f82015-04-13 16:30:14 +02001372/* default update function for applets, to be used at the end of the i/o handler */
1373static void stream_int_update_applet(struct stream_interface *si)
1374{
1375 int old_flags = si->flags;
1376 struct channel *ic = si_ic(si);
1377 struct channel *oc = si_oc(si);
1378
1379 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
1380 __FUNCTION__,
1381 si, si->state, ic->flags, oc->flags);
1382
1383 if (si->state != SI_ST_EST)
1384 return;
1385
1386 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == CF_SHUTW_NOW &&
1387 channel_is_empty(oc))
1388 si_shutw(si);
1389
1390 if ((oc->flags & (CF_SHUTW|CF_SHUTW_NOW)) == 0 && channel_may_recv(oc))
1391 si->flags |= SI_FL_WAIT_DATA;
1392
1393 /* we're almost sure that we need some space if the buffer is not
1394 * empty, even if it's not full, because the applets can't fill it.
1395 */
1396 if ((ic->flags & (CF_SHUTR|CF_DONT_READ)) == 0 && !channel_is_empty(ic))
1397 si->flags |= SI_FL_WAIT_ROOM;
1398
1399 if (oc->flags & CF_WRITE_ACTIVITY) {
1400 if (tick_isset(oc->wex))
1401 oc->wex = tick_add_ifset(now_ms, oc->wto);
1402 }
1403
1404 if (ic->flags & CF_READ_ACTIVITY ||
1405 (oc->flags & CF_WRITE_ACTIVITY && !(si->flags & SI_FL_INDEP_STR))) {
1406 if (tick_isset(ic->rex))
1407 ic->rex = tick_add_ifset(now_ms, ic->rto);
1408 }
1409
1410 /* save flags to detect changes */
1411 old_flags = si->flags;
1412 if (likely((oc->flags & (CF_SHUTW|CF_WRITE_PARTIAL|CF_DONT_READ)) == CF_WRITE_PARTIAL &&
1413 channel_may_recv(oc) &&
1414 (si_opposite(si)->flags & SI_FL_WAIT_ROOM)))
1415 si_chk_rcv(si_opposite(si));
1416
1417 if (((ic->flags & CF_READ_PARTIAL) && !channel_is_empty(ic)) &&
1418 (ic->pipe /* always try to send spliced data */ ||
1419 (ic->buf->i == 0 && (si_opposite(si)->flags & SI_FL_WAIT_DATA)))) {
1420 si_chk_snd(si_opposite(si));
1421 /* check if the consumer has freed some space */
1422 if (channel_may_recv(ic) && !ic->pipe)
1423 si->flags &= ~SI_FL_WAIT_ROOM;
1424 }
1425
1426 /* Note that we're trying to wake up in two conditions here :
1427 * - special event, which needs the holder task attention
1428 * - status indicating that the applet can go on working. This
1429 * is rather hard because we might be blocking on output and
1430 * don't want to wake up on input and vice-versa. The idea is
1431 * to only rely on the changes the chk_* might have performed.
1432 */
1433 if (/* check stream interface changes */
1434 ((old_flags & ~si->flags) & (SI_FL_WAIT_ROOM|SI_FL_WAIT_DATA)) ||
1435
1436 /* changes on the production side */
1437 (ic->flags & (CF_READ_NULL|CF_READ_ERROR)) ||
1438 si->state != SI_ST_EST ||
1439 (si->flags & SI_FL_ERR) ||
1440 ((ic->flags & CF_READ_PARTIAL) &&
1441 (!ic->to_forward || si_opposite(si)->state != SI_ST_EST)) ||
1442
1443 /* changes on the consumption side */
1444 (oc->flags & (CF_WRITE_NULL|CF_WRITE_ERROR)) ||
1445 ((oc->flags & CF_WRITE_ACTIVITY) &&
1446 ((oc->flags & CF_SHUTW) ||
1447 ((oc->flags & CF_WAKE_WRITE) &&
1448 (si_opposite(si)->state != SI_ST_EST ||
1449 (channel_is_empty(oc) && !oc->to_forward)))))) {
1450 if (!(si->flags & SI_FL_DONT_WAKE))
1451 task_wakeup(si_task(si), TASK_WOKEN_IO);
1452 }
1453 if (ic->flags & CF_READ_ACTIVITY)
1454 ic->flags &= ~CF_READ_DONTWAIT;
1455}
1456
1457/*
1458 * This function performs a shutdown-read on a stream interface attached to an
1459 * applet in a connected or init state (it does nothing for other states). It
1460 * either shuts the read side or marks itself as closed. The buffer flags are
1461 * updated to reflect the new state. If the stream interface has SI_FL_NOHALF,
1462 * we also forward the close to the write side. The owner task is woken up if
1463 * it exists.
1464 */
1465static void stream_int_shutr_applet(struct stream_interface *si)
1466{
1467 struct channel *ic = si_ic(si);
1468
1469 ic->flags &= ~CF_SHUTR_NOW;
1470 if (ic->flags & CF_SHUTR)
1471 return;
1472 ic->flags |= CF_SHUTR;
1473 ic->rex = TICK_ETERNITY;
1474 si->flags &= ~SI_FL_WAIT_ROOM;
1475
1476 if (si->state != SI_ST_EST && si->state != SI_ST_CON)
1477 return;
1478
1479 if (si_oc(si)->flags & CF_SHUTW) {
1480 si->state = SI_ST_DIS;
1481 si->exp = TICK_ETERNITY;
1482 si_applet_release(si);
1483 }
1484 else if (si->flags & SI_FL_NOHALF) {
1485 /* we want to immediately forward this close to the write side */
1486 return stream_int_shutw_applet(si);
1487 }
1488
1489 /* note that if the task exists, it must unregister itself once it runs */
1490 if (!(si->flags & SI_FL_DONT_WAKE))
1491 task_wakeup(si_task(si), TASK_WOKEN_IO);
1492}
1493
1494/*
1495 * This function performs a shutdown-write on a stream interface attached to an
1496 * applet in a connected or init state (it does nothing for other states). It
1497 * either shuts the write side or marks itself as closed. The buffer flags are
1498 * updated to reflect the new state. It does also close everything if the SI
1499 * was marked as being in error state. The owner task is woken up if it exists.
1500 */
1501static void stream_int_shutw_applet(struct stream_interface *si)
1502{
1503 struct channel *ic = si_ic(si);
1504 struct channel *oc = si_oc(si);
1505
1506 oc->flags &= ~CF_SHUTW_NOW;
1507 if (oc->flags & CF_SHUTW)
1508 return;
1509 oc->flags |= CF_SHUTW;
1510 oc->wex = TICK_ETERNITY;
1511 si->flags &= ~SI_FL_WAIT_DATA;
1512
1513 switch (si->state) {
1514 case SI_ST_EST:
1515 /* we have to shut before closing, otherwise some short messages
1516 * may never leave the system, especially when there are remaining
1517 * unread data in the socket input buffer, or when nolinger is set.
1518 * However, if SI_FL_NOLINGER is explicitly set, we know there is
1519 * no risk so we close both sides immediately.
1520 */
1521 if (!(si->flags & (SI_FL_ERR | SI_FL_NOLINGER)) &&
1522 !(ic->flags & (CF_SHUTR|CF_DONT_READ)))
1523 return;
1524
1525 /* fall through */
1526 case SI_ST_CON:
1527 case SI_ST_CER:
1528 case SI_ST_QUE:
1529 case SI_ST_TAR:
1530 /* Note that none of these states may happen with applets */
1531 si->state = SI_ST_DIS;
1532 si_applet_release(si);
1533 default:
1534 si->flags &= ~(SI_FL_WAIT_ROOM | SI_FL_NOLINGER);
1535 ic->flags &= ~CF_SHUTR_NOW;
1536 ic->flags |= CF_SHUTR;
1537 ic->rex = TICK_ETERNITY;
1538 si->exp = TICK_ETERNITY;
1539 }
1540
1541 /* note that if the task exists, it must unregister itself once it runs */
1542 if (!(si->flags & SI_FL_DONT_WAKE))
1543 task_wakeup(si_task(si), TASK_WOKEN_IO);
1544}
1545
1546/* chk_rcv function for applets */
1547static void stream_int_chk_rcv_applet(struct stream_interface *si)
1548{
1549 struct channel *ic = si_ic(si);
1550
1551 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
1552 __FUNCTION__,
1553 si, si->state, ic->flags, si_oc(si)->flags);
1554
1555 if (unlikely(si->state != SI_ST_EST || (ic->flags & (CF_SHUTR|CF_DONT_READ))))
1556 return;
1557
1558 if (!channel_may_recv(ic) || ic->pipe) {
1559 /* stop reading */
1560 si->flags |= SI_FL_WAIT_ROOM;
1561 }
1562 else {
1563 /* (re)start reading */
1564 si->flags &= ~SI_FL_WAIT_ROOM;
1565 if (!(si->flags & SI_FL_DONT_WAKE))
1566 task_wakeup(si_task(si), TASK_WOKEN_IO);
1567 }
1568}
1569
1570/* chk_snd function for applets */
1571static void stream_int_chk_snd_applet(struct stream_interface *si)
1572{
1573 struct channel *oc = si_oc(si);
1574
1575 DPRINTF(stderr, "%s: si=%p, si->state=%d ic->flags=%08x oc->flags=%08x\n",
1576 __FUNCTION__,
1577 si, si->state, si_ic(si)->flags, oc->flags);
1578
1579 if (unlikely(si->state != SI_ST_EST || (oc->flags & CF_SHUTW)))
1580 return;
1581
1582 if (!(si->flags & SI_FL_WAIT_DATA) || /* not waiting for data */
1583 channel_is_empty(oc)) /* called with nothing to send ! */
1584 return;
1585
1586 /* Otherwise there are remaining data to be sent in the buffer,
1587 * so we tell the handler.
1588 */
1589 si->flags &= ~SI_FL_WAIT_DATA;
1590 if (!tick_isset(oc->wex))
1591 oc->wex = tick_add_ifset(now_ms, oc->wto);
1592
1593 if (!(si->flags & SI_FL_DONT_WAKE))
1594 task_wakeup(si_task(si), TASK_WOKEN_IO);
1595}
1596
Willy Tarreaudded32d2008-11-30 19:48:07 +01001597/*
Willy Tarreaucff64112008-11-03 06:26:53 +01001598 * Local variables:
1599 * c-indent-level: 8
1600 * c-basic-offset: 8
1601 * End:
1602 */