blob: 63f59617f8c46bc6d5cff2e65dc2e7ebac67eb5f [file] [log] [blame]
Willy Tarreaubaaee002006-06-26 02:48:02 +02001/*
2 * Backend variables and functions.
3 *
Willy Tarreau1a7eca12013-01-07 22:38:03 +01004 * Copyright 2000-2013 Willy Tarreau <w@1wt.eu>
Willy Tarreaubaaee002006-06-26 02:48:02 +02005 *
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#include <syslog.h>
Willy Tarreauf19cf372006-11-14 15:40:51 +010018#include <string.h>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +020019#include <ctype.h>
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +040020#include <sys/types.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020021
Willy Tarreauc7e42382012-08-24 19:22:53 +020022#include <common/buffer.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020023#include <common/compat.h>
Willy Tarreaue3ba5f02006-06-29 18:54:54 +020024#include <common/config.h>
Willy Tarreau7c669d72008-06-20 15:04:11 +020025#include <common/debug.h>
Bhaskar98634f02013-10-29 23:30:51 -040026#include <common/hash.h>
Christopher Fauletf7679ad2019-02-04 12:02:18 +010027#include <common/htx.h>
Willy Tarreau0108d902018-11-25 19:14:37 +010028#include <common/initcall.h>
Willy Tarreau0c303ee2008-07-07 00:09:58 +020029#include <common/ticks.h>
Willy Tarreau2dd0d472006-06-29 17:53:05 +020030#include <common/time.h>
KOVACS Krisztianb3e54fe2014-11-17 15:11:45 +010031#include <common/namespace.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020032
Willy Tarreaubaaee002006-06-26 02:48:02 +020033#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020034
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +010035#include <proto/acl.h>
Willy Tarreau34db1082012-04-19 17:16:54 +020036#include <proto/arg.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020037#include <proto/backend.h>
Willy Tarreauc7e42382012-08-24 19:22:53 +020038#include <proto/channel.h>
Willy Tarreau3a9312a2020-01-09 18:43:15 +010039#include <proto/checks.h>
Willy Tarreau03fa5df2010-05-24 21:02:37 +020040#include <proto/frontend.h>
Christopher Fauletf7679ad2019-02-04 12:02:18 +010041#include <proto/http_htx.h>
Willy Tarreau6b2e11b2009-10-01 07:52:15 +020042#include <proto/lb_chash.h>
Willy Tarreauf09c6602012-02-13 17:12:08 +010043#include <proto/lb_fas.h>
Willy Tarreauf89c1872009-10-01 11:19:37 +020044#include <proto/lb_fwlc.h>
45#include <proto/lb_fwrr.h>
46#include <proto/lb_map.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020047#include <proto/log.h>
Willy Tarreau53a47662017-08-28 10:53:00 +020048#include <proto/mux_pt.h>
Willy Tarreau3fdb3662012-11-12 00:42:33 +010049#include <proto/obj_type.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010050#include <proto/payload.h>
Willy Tarreaud1d54542012-09-12 22:58:11 +020051#include <proto/protocol.h>
Christopher Fauletfc9cfe42019-07-16 14:54:53 +020052#include <proto/http_ana.h>
Willy Tarreaua8f55d52010-05-31 17:44:19 +020053#include <proto/proto_tcp.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020054#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020055#include <proto/queue.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010056#include <proto/sample.h>
Willy Tarreau7f062c42009-03-05 18:43:00 +010057#include <proto/server.h>
Olivier Houchard00cf70f2018-11-30 17:24:55 +010058#include <proto/session.h>
Willy Tarreau87b09662015-04-03 00:22:06 +020059#include <proto/stream.h>
Willy Tarreau9e000c62011-03-10 14:03:36 +010060#include <proto/stream_interface.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020061#include <proto/ssl_sock.h>
Willy Tarreauc125cef2019-05-10 09:58:43 +020062#include <proto/task.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020063
Christopher Fauleteea8fc72019-11-05 16:18:10 +010064#define TRACE_SOURCE &trace_strm
65
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050066int be_lastsession(const struct proxy *be)
67{
68 if (be->be_counters.last_sess)
69 return now.tv_sec - be->be_counters.last_sess;
70
71 return -1;
72}
73
Bhaskar98634f02013-10-29 23:30:51 -040074/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070075static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040076{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070077 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040078
79 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
80 case BE_LB_HFCN_DJB2:
81 hash = hash_djb2(key, len);
82 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010083 case BE_LB_HFCN_WT6:
84 hash = hash_wt6(key, len);
85 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010086 case BE_LB_HFCN_CRC32:
87 hash = hash_crc32(key, len);
88 break;
Bhaskar98634f02013-10-29 23:30:51 -040089 case BE_LB_HFCN_SDBM:
90 /* this is the default hash function */
91 default:
92 hash = hash_sdbm(key, len);
93 break;
94 }
95
96 return hash;
97}
98
Willy Tarreaubaaee002006-06-26 02:48:02 +020099/*
100 * This function recounts the number of usable active and backup servers for
101 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +0100102 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +0100103 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +0100104 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200105 * This functions is designed to be called before server's weight and state
106 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200107 *
108 * threads: this is the caller responsibility to lock data. For now, this
109 * function is called from lb modules, so it should be ok. But if you need to
110 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200111 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200112void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200113{
114 struct server *srv;
115
Willy Tarreau20697042007-11-15 23:26:18 +0100116 px->srv_act = px->srv_bck = 0;
117 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100118 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200119 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200120 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100121 continue;
122
Willy Tarreauc93cd162014-05-13 15:54:22 +0200123 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100124 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100125 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100126 px->lbprm.fbck = srv;
127 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400128 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200129 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100130 } else {
131 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400132 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200133 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200134 }
135 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100136}
Willy Tarreau20697042007-11-15 23:26:18 +0100137
Willy Tarreaub625a082007-11-26 01:15:43 +0100138/* This function simply updates the backend's tot_weight and tot_used values
139 * after servers weights have been updated. It is designed to be used after
140 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200141 *
142 * threads: this is the caller responsibility to lock data. For now, this
143 * function is called from lb modules, so it should be ok. But if you need to
144 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100145 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200146void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100147{
Willy Tarreau20697042007-11-15 23:26:18 +0100148 if (px->srv_act) {
149 px->lbprm.tot_weight = px->lbprm.tot_wact;
150 px->lbprm.tot_used = px->srv_act;
151 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100152 else if (px->lbprm.fbck) {
153 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200154 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100155 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100156 }
157 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100158 px->lbprm.tot_weight = px->lbprm.tot_wbck;
159 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100160 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100161}
162
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200163/*
164 * This function tries to find a running server for the proxy <px> following
165 * the source hash method. Depending on the number of active/backup servers,
166 * it will either look for active servers, or for backup servers.
167 * If any server is found, it will be returned. If no valid server is found,
168 * NULL is returned.
169 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100170static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200171{
172 unsigned int h, l;
173
174 if (px->lbprm.tot_weight == 0)
175 return NULL;
176
177 l = h = 0;
178
179 /* note: we won't hash if there's only one server left */
180 if (px->lbprm.tot_used == 1)
181 goto hash_done;
182
183 while ((l + sizeof (int)) <= len) {
184 h ^= ntohl(*(unsigned int *)(&addr[l]));
185 l += sizeof (int);
186 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500187 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100188 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200189 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100190 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100191 return chash_get_server_hash(px, h, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200192 else
193 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200194}
195
196/*
197 * This function tries to find a running server for the proxy <px> following
198 * the URI hash method. In order to optimize cache hits, the hash computation
199 * ends at the question mark. Depending on the number of active/backup servers,
200 * it will either look for active servers, or for backup servers.
201 * If any server is found, it will be returned. If no valid server is found,
Willy Tarreaua9a72492019-01-14 16:14:15 +0100202 * NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
203 * the "whole" optional argument (boolean), the "len" argument (numeric) and
204 * the "depth" argument (numeric).
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200205 *
206 * This code was contributed by Guillaume Dallaire, who also selected this hash
207 * algorithm out of a tens because it gave him the best results.
208 *
209 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100210static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200211{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700212 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200213 int c;
214 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400215 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200216
217 if (px->lbprm.tot_weight == 0)
218 return NULL;
219
220 /* note: we won't hash if there's only one server left */
221 if (px->lbprm.tot_used == 1)
222 goto hash_done;
223
Willy Tarreaua9a72492019-01-14 16:14:15 +0100224 if (px->lbprm.arg_opt2) // "len"
225 uri_len = MIN(uri_len, px->lbprm.arg_opt2);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200226
Bhaskar98634f02013-10-29 23:30:51 -0400227 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200228 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200229 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200230 if (c == '/') {
231 slashes++;
Willy Tarreaua9a72492019-01-14 16:14:15 +0100232 if (slashes == px->lbprm.arg_opt3) /* depth+1 */
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200233 break;
234 }
Willy Tarreaua9a72492019-01-14 16:14:15 +0100235 else if (c == '?' && !px->lbprm.arg_opt1) // "whole"
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200236 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200237 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200238 }
Bhaskar98634f02013-10-29 23:30:51 -0400239
240 hash = gen_hash(px, start, (end - start));
241
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500242 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100243 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200244 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100245 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100246 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200247 else
248 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200249}
250
Christopher Faulet5b517552017-06-09 14:17:53 +0200251/*
Willy Tarreau01732802007-11-01 22:48:15 +0100252 * This function tries to find a running server for the proxy <px> following
253 * the URL parameter hash method. It looks for a specific parameter in the
254 * URL and hashes it to compute the server ID. This is useful to optimize
255 * performance by avoiding bounces between servers in contexts where sessions
256 * are shared but cookies are not usable. If the parameter is not found, NULL
257 * is returned. If any server is found, it will be returned. If no valid server
258 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100259 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100260static struct server *get_server_ph(struct proxy *px, const char *uri, int uri_len, const struct server *avoid)
Willy Tarreau01732802007-11-01 22:48:15 +0100261{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700262 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400263 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200264 const char *p;
265 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100266 int plen;
267
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200268 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100269 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100270 return NULL;
271
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200272 if ((p = memchr(uri, '?', uri_len)) == NULL)
273 return NULL;
274
Willy Tarreau01732802007-11-01 22:48:15 +0100275 p++;
276
277 uri_len -= (p - uri);
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100278 plen = px->lbprm.arg_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200279 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100280
281 while (uri_len > plen) {
282 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200283 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100284 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200285 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100286 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200287 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100288 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200289 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400290 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200291 uri_len -= plen + 1;
292
Bhaskar98634f02013-10-29 23:30:51 -0400293 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100294 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400295 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100296 }
Bhaskar98634f02013-10-29 23:30:51 -0400297 hash = gen_hash(px, start, (end - start));
298
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500299 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100300 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400301
Willy Tarreau6c30be52019-01-14 17:07:39 +0100302 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100303 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200304 else
305 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100306 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200307 }
308 /* skip to next parameter */
309 p = memchr(params, '&', uri_len);
310 if (!p)
311 return NULL;
312 p++;
313 uri_len -= (p - params);
314 params = p;
315 }
316 return NULL;
317}
318
319/*
320 * this does the same as the previous server_ph, but check the body contents
321 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100322static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200323{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700324 unsigned int hash = 0;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100325 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200326 struct proxy *px = s->be;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200327 struct htx *htx = htxbuf(&req->buf);
328 struct htx_blk *blk;
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100329 unsigned int plen = px->lbprm.arg_len;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100330 unsigned long len;
331 const char *params, *p, *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200332
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100333 if (px->lbprm.tot_weight == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200334 return NULL;
335
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200336 p = params = NULL;
337 len = 0;
338 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
339 enum htx_blk_type type = htx_get_blk_type(blk);
340 struct ist v;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200341
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200342 if (type != HTX_BLK_DATA)
343 continue;
344 v = htx_get_blk_value(htx, blk);
345 p = params = v.ptr;
346 len = v.len;
347 break;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100348 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200349
350 while (len > plen) {
351 /* Look for the parameter name followed by an equal symbol */
352 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100353 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200354 /* OK, we have the parameter here at <params>, and
355 * the value after the equal sign, at <p>
356 * skip the equal symbol
357 */
358 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400359 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200360 len -= plen + 1;
361
Bhaskar98634f02013-10-29 23:30:51 -0400362 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200363 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100364 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400365 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100366 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200367 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
368 break;
369 return NULL; /* oh, no; this is not uri-encoded.
370 * This body does not contain parameters.
371 */
372 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200373 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400374 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200375 /* should we break if vlen exceeds limit? */
376 }
Bhaskar98634f02013-10-29 23:30:51 -0400377 hash = gen_hash(px, start, (end - start));
378
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500379 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100380 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400381
Willy Tarreau6c30be52019-01-14 17:07:39 +0100382 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100383 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200384 else
385 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200386 }
387 }
Willy Tarreau01732802007-11-01 22:48:15 +0100388 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200389 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100390 if (!p)
391 return NULL;
392 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200393 len -= (p - params);
394 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100395 }
396 return NULL;
397}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200398
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200399
Willy Tarreaubaaee002006-06-26 02:48:02 +0200400/*
Benoitaffb4812009-03-25 13:02:10 +0100401 * This function tries to find a running server for the proxy <px> following
402 * the Header parameter hash method. It looks for a specific parameter in the
403 * URL and hashes it to compute the server ID. This is useful to optimize
404 * performance by avoiding bounces between servers in contexts where sessions
405 * are shared but cookies are not usable. If the parameter is not found, NULL
406 * is returned. If any server is found, it will be returned. If no valid server
Willy Tarreau9fed8582019-01-14 16:04:54 +0100407 * is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
408 * apply to the middle part of a domain name ("use_domain_only" option).
Benoitaffb4812009-03-25 13:02:10 +0100409 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100410static struct server *get_server_hh(struct stream *s, const struct server *avoid)
Benoitaffb4812009-03-25 13:02:10 +0100411{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700412 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100413 struct proxy *px = s->be;
Willy Tarreau484ff072019-01-14 15:28:53 +0100414 unsigned int plen = px->lbprm.arg_len;
Benoitaffb4812009-03-25 13:02:10 +0100415 unsigned long len;
Benoitaffb4812009-03-25 13:02:10 +0100416 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400417 const char *start, *end;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200418 struct htx *htx = htxbuf(&s->req.buf);
419 struct http_hdr_ctx ctx = { .blk = NULL };
Benoitaffb4812009-03-25 13:02:10 +0100420
421 /* tot_weight appears to mean srv_count */
422 if (px->lbprm.tot_weight == 0)
423 return NULL;
424
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200425 /* note: we won't hash if there's only one server left */
426 if (px->lbprm.tot_used == 1)
427 goto hash_done;
428
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200429 http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100430
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200431 /* if the header is not found or empty, let's fallback to round robin */
432 if (!ctx.blk || !ctx.value.len)
433 return NULL;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100434
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200435 /* Found a the param_name in the headers.
436 * we will compute the hash based on this value ctx.val.
437 */
438 len = ctx.value.len;
439 p = ctx.value.ptr;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100440
Willy Tarreau9fed8582019-01-14 16:04:54 +0100441 if (!px->lbprm.arg_opt1) {
Bhaskar98634f02013-10-29 23:30:51 -0400442 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100443 } else {
444 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100445 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100446 /* special computation, use only main domain name, not tld/host
447 * going back from the end of string, start hashing at first
448 * dot stop at next.
449 * This is designed to work with the 'Host' header, and requires
450 * a special option to activate this.
451 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100452 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100453 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100454 if (dohash) {
455 /* Rewind the pointer until the previous char
456 * is a dot, this will allow to set the start
457 * position of the domain. */
458 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100459 break;
Benoitaffb4812009-03-25 13:02:10 +0100460 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100461 else if (*p == '.') {
462 /* The pointer is rewinded to the dot before the
463 * tld, we memorize the end of the domain and
464 * can enter the domain processing. */
465 end = p;
466 dohash = 1;
467 }
Benoitaffb4812009-03-25 13:02:10 +0100468 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100469 len--;
Benoitaffb4812009-03-25 13:02:10 +0100470 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100471 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400472 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100473 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500474 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100475 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200476 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100477 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100478 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200479 else
480 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100481}
482
Willy Tarreau34db1082012-04-19 17:16:54 +0200483/* RDP Cookie HASH. */
Willy Tarreau59884a62019-01-02 14:48:31 +0100484static struct server *get_server_rch(struct stream *s, const struct server *avoid)
Emeric Brun736aa232009-06-30 17:56:00 +0200485{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700486 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200487 struct proxy *px = s->be;
488 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200489 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200490 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200491 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200492
493 /* tot_weight appears to mean srv_count */
494 if (px->lbprm.tot_weight == 0)
495 return NULL;
496
Willy Tarreau37406352012-04-23 16:16:37 +0200497 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200498
Willy Tarreau6a445eb2018-06-19 07:04:45 +0200499 rewind = co_data(&s->req);
500 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200501
Willy Tarreau484ff072019-01-14 15:28:53 +0100502 ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200503 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100504
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200505 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200506
Willy Tarreau37406352012-04-23 16:16:37 +0200507 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200508 return NULL;
509
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200510 /* note: we won't hash if there's only one server left */
511 if (px->lbprm.tot_used == 1)
512 goto hash_done;
513
Willy Tarreau484ff072019-01-14 15:28:53 +0100514 /* Found the param_name in the headers.
Emeric Brun736aa232009-06-30 17:56:00 +0200515 * we will compute the hash based on this value ctx.val.
516 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200517 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400518
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500519 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100520 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200521 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100522 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100523 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200524 else
525 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200526}
Christopher Faulet5b517552017-06-09 14:17:53 +0200527
Willy Tarreau760e81d2018-05-03 07:20:40 +0200528/* random value */
Willy Tarreau59884a62019-01-02 14:48:31 +0100529static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
Willy Tarreau760e81d2018-05-03 07:20:40 +0200530{
531 unsigned int hash = 0;
532 struct proxy *px = s->be;
Willy Tarreau21c741a2019-01-14 18:14:27 +0100533 struct server *prev, *curr;
534 int draws = px->lbprm.arg_opt1; // number of draws
Willy Tarreau760e81d2018-05-03 07:20:40 +0200535
536 /* tot_weight appears to mean srv_count */
537 if (px->lbprm.tot_weight == 0)
538 return NULL;
539
Willy Tarreau21c741a2019-01-14 18:14:27 +0100540 curr = NULL;
541 do {
542 prev = curr;
Willy Tarreaub9f54c52020-03-08 17:31:39 +0100543 hash = ha_random32();
Willy Tarreau21c741a2019-01-14 18:14:27 +0100544 curr = chash_get_server_hash(px, hash, avoid);
545 if (!curr)
546 break;
547
548 /* compare the new server to the previous best choice and pick
549 * the one with the least currently served requests.
550 */
551 if (prev && prev != curr &&
552 curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
553 curr = prev;
554 } while (--draws > 0);
555
556 return curr;
Willy Tarreau760e81d2018-05-03 07:20:40 +0200557}
558
Benoitaffb4812009-03-25 13:02:10 +0100559/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200560 * This function applies the load-balancing algorithm to the stream, as
561 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200562 * 'assigned'.
563 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200564 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200565 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100566 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200567 * The function tries to keep the original connection slot if it reconnects to
568 * the same server, otherwise it releases it and tries to offer it.
569 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200570 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200571 *
572 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100573 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200574 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
575 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200576 * SRV_STATUS_INTERNAL for other unrecoverable errors.
577 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200578 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100579 * it does not need to be called anymore. This means that target_srv(&s->target)
580 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200581 *
582 */
583
Willy Tarreau87b09662015-04-03 00:22:06 +0200584int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200585{
Olivier Houchardba4fff52018-12-01 14:40:40 +0100586 struct connection *conn = NULL;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200587 struct server *conn_slot;
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100588 struct server *srv = NULL, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200589 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100590
Simon Horman8effd3d2011-08-13 08:03:52 +0900591 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200592
Willy Tarreau7c669d72008-06-20 15:04:11 +0200593 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200594 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200595 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100596
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100597 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200598 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200599
Willy Tarreau7c669d72008-06-20 15:04:11 +0200600 /* We have to release any connection slot before applying any LB algo,
601 * otherwise we may erroneously end up with no available slot.
602 */
603 if (conn_slot)
604 sess_change_server(s, NULL);
605
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100606 /* We will now try to find the good server and store it into <objt_server(s->target)>.
607 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200608 * as well as if no server is available (check error code).
609 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100610
Willy Tarreau827aee92011-03-10 16:55:02 +0100611 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100612 s->target = NULL;
Willy Tarreau664beb82011-03-10 11:38:29 +0100613
Olivier Houchardba4fff52018-12-01 14:40:40 +0100614 if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200615 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100616 (s->be->options & PR_O_PREF_LAST))) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100617 struct sess_srv_list *srv_list;
618 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
619 struct server *tmpsrv = objt_server(srv_list->target);
Olivier Houchardba4fff52018-12-01 14:40:40 +0100620
621 if (tmpsrv && tmpsrv->proxy == s->be &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200622 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100623 (!s->be->max_ka_queue ||
624 server_has_room(tmpsrv) || (
625 tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
626 srv_currently_usable(tmpsrv)) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100627 list_for_each_entry(conn, &srv_list->conn_list, session_list) {
Willy Tarreau911db9b2020-01-23 16:27:54 +0100628 if (!(conn->flags & CO_FL_WAIT_XPRT)) {
Olivier Houchardba4fff52018-12-01 14:40:40 +0100629 srv = tmpsrv;
630 s->target = &srv->obj_type;
631 goto out_ok;
632 }
633 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100634 }
635 }
Willy Tarreau9420b122013-12-15 18:58:25 +0100636 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100637 if (s->be->lbprm.algo & BE_LB_KIND) {
Christopher Faulet5b517552017-06-09 14:17:53 +0200638
Willy Tarreau7c669d72008-06-20 15:04:11 +0200639 /* we must check if we have at least one server available */
640 if (!s->be->lbprm.tot_weight) {
641 err = SRV_STATUS_NOSRV;
642 goto out;
643 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200644
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200645 /* First check whether we need to fetch some data or simply call
646 * the LB lookup function. Only the hashing functions will need
647 * some input data in fact, and will support multiple algorithms.
648 */
649 switch (s->be->lbprm.algo & BE_LB_LKUP) {
650 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100651 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200652 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200653
Willy Tarreauf09c6602012-02-13 17:12:08 +0100654 case BE_LB_LKUP_FSTREE:
655 srv = fas_get_next_server(s->be, prev_srv);
656 break;
657
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200658 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100659 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200660 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200661
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200662 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200663 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200664 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200665 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
Willy Tarreau59884a62019-01-02 14:48:31 +0100666 srv = get_server_rnd(s, prev_srv);
Willy Tarreau6c30be52019-01-14 17:07:39 +0100667 else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100668 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200669 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100670 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200671 break;
672 }
673 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200674 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200675 err = SRV_STATUS_INTERNAL;
676 goto out;
677 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200678
679 switch (s->be->lbprm.algo & BE_LB_PARM) {
680 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200681 conn = objt_conn(strm_orig(s));
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200682 if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200683 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200684 (void *)&((struct sockaddr_in *)conn->src)->sin_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100685 4, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200686 }
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200687 else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200688 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200689 (void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100690 16, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200691 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200692 else {
693 /* unknown IP family */
694 err = SRV_STATUS_INTERNAL;
695 goto out;
696 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200697 break;
698
699 case BE_LB_HASH_URI:
700 /* URI hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200701 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100702 struct ist uri;
703
Christopher Faulet297fbb42019-05-13 14:41:27 +0200704 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100705 srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
706 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200707 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200708
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200709 case BE_LB_HASH_PRM:
710 /* URL Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200711 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100712 struct ist uri;
713
Christopher Faulet297fbb42019-05-13 14:41:27 +0200714 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100715 srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100716
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200717 if (!srv && s->txn->meth == HTTP_METH_POST)
718 srv = get_server_ph_post(s, prev_srv);
719 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200720 break;
Benoitaffb4812009-03-25 13:02:10 +0100721
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200722 case BE_LB_HASH_HDR:
723 /* Header Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200724 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
725 srv = get_server_hh(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200726 break;
727
728 case BE_LB_HASH_RDP:
729 /* RDP Cookie hashing */
Willy Tarreau59884a62019-01-02 14:48:31 +0100730 srv = get_server_rch(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200731 break;
732
733 default:
734 /* unknown balancing algorithm */
735 err = SRV_STATUS_INTERNAL;
736 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100737 }
Emeric Brun736aa232009-06-30 17:56:00 +0200738
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200739 /* If the hashing parameter was not found, let's fall
740 * back to round robin on the map.
741 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100742 if (!srv) {
Willy Tarreau6c30be52019-01-14 17:07:39 +0100743 if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100744 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200745 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100746 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200747 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200748
749 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200750 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200751
Willy Tarreau7c669d72008-06-20 15:04:11 +0200752 default:
753 /* unknown balancing algorithm */
754 err = SRV_STATUS_INTERNAL;
755 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200756 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200757
Willy Tarreau827aee92011-03-10 16:55:02 +0100758 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200759 err = SRV_STATUS_FULL;
760 goto out;
761 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100762 else if (srv != prev_srv) {
Olivier Houchard237f7812019-03-08 18:49:07 +0100763 _HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
764 _HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100765 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100766 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200767 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200768 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100769 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200770 }
Olivier Houchard2442f682018-12-01 17:03:38 +0100771 else if ((s->be->options & PR_O_HTTP_PROXY)) {
772 conn = cs_conn(objt_cs(s->si[1].end));
773
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200774 if (conn && conn->dst && is_addr(conn->dst)) {
Olivier Houchard2442f682018-12-01 17:03:38 +0100775 /* in proxy mode, we need a valid destination address */
776 s->target = &s->be->obj_type;
777 } else {
778 err = SRV_STATUS_NOSRV;
779 goto out;
780 }
Willy Tarreau664beb82011-03-10 11:38:29 +0100781 }
782 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200783 err = SRV_STATUS_NOSRV;
784 goto out;
785 }
786
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100787out_ok:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200788 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200789 err = SRV_STATUS_OK;
790 out:
791
792 /* Either we take back our connection slot, or we offer it to someone
793 * else if we don't need it anymore.
794 */
795 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100796 if (conn_slot == srv) {
797 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200798 } else {
799 if (may_dequeue_tasks(conn_slot, s->be))
800 process_srv_queue(conn_slot);
801 }
802 }
803
804 out_err:
805 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200806}
807
Willy Tarreaubaaee002006-06-26 02:48:02 +0200808/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200809 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200810 * The address is taken from the currently assigned server, or from the
811 * dispatch or transparent address.
812 *
813 * It may return :
814 * SRV_STATUS_OK if everything is OK.
815 * SRV_STATUS_INTERNAL for other unrecoverable errors.
816 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200817 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200818 * not cleared, so it's to the caller to clear it if required.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200819 */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200820int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200821{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200822 struct connection *cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200823
Christopher Faulet56803b12017-11-24 16:06:18 +0100824 DPRINTF(stderr,"assign_server_address : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200825
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200826 if (!sockaddr_alloc(&s->target_addr))
Willy Tarreauca79f592019-07-17 19:04:47 +0200827 return SRV_STATUS_INTERNAL;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200828
Willy Tarreaue7dff022015-04-03 01:14:29 +0200829 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200830 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200831 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200832 return SRV_STATUS_INTERNAL;
833
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200834 *s->target_addr = __objt_server(s->target)->addr;
835 set_host_port(s->target_addr, __objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200836
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200837 if (!is_addr(s->target_addr) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200838 /* if the server has no address, we use the same address
839 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200840 * locally on multiple addresses at once. Nothing is done
841 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200842 */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200843 if (!conn_get_dst(cli_conn)) {
844 /* do nothing if we can't retrieve the address */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200845 } else if (cli_conn->dst->ss_family == AF_INET) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200846 ((struct sockaddr_in *)s->target_addr)->sin_addr = ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200847 } else if (cli_conn->dst->ss_family == AF_INET6) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200848 ((struct sockaddr_in6 *)s->target_addr)->sin6_addr = ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200849 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200850 }
851
Willy Tarreaubaaee002006-06-26 02:48:02 +0200852 /* if this server remaps proxied ports, we'll use
853 * the port the client connected to with an offset. */
Willy Tarreau1e582e52018-09-20 11:29:28 +0200854 if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100855 int base_port;
856
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200857 if (conn_get_dst(cli_conn)) {
858 /* First, retrieve the port from the incoming connection */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200859 base_port = get_host_port(cli_conn->dst);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100860
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200861 /* Second, assign the outgoing connection's port */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200862 base_port += get_host_port(s->target_addr);
863 set_host_port(s->target_addr, base_port);
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200864 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200865 }
866 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200867 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200868 /* connect to the defined dispatch addr */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200869 *s->target_addr = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200870 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200871 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200872 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200873 if (conn_get_dst(cli_conn) &&
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200874 (cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200875 *s->target_addr = *cli_conn->dst;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200876 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100877 else if (s->be->options & PR_O_HTTP_PROXY) {
878 /* If HTTP PROXY option is set, then server is already assigned
879 * during incoming client request parsing. */
880 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100881 else {
882 /* no server and no LB algorithm ! */
883 return SRV_STATUS_INTERNAL;
884 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200885
Willy Tarreaue7dff022015-04-03 01:14:29 +0200886 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200887 return SRV_STATUS_OK;
888}
889
Willy Tarreau87b09662015-04-03 00:22:06 +0200890/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200891 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200892 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200893 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200894 * be called before any connection and after any retry or redispatch occurs.
895 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200896 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200897 *
898 * Returns :
899 *
900 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100901 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200902 * SRV_STATUS_QUEUED if the connection has been queued.
903 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100904 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200905 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200906 * SRV_STATUS_INTERNAL for other unrecoverable errors.
907 *
908 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200909int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200910{
911 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100912 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200913 int err;
914
915 if (s->pend_pos)
916 return SRV_STATUS_INTERNAL;
917
Willy Tarreau7c669d72008-06-20 15:04:11 +0200918 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200919 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100920 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100921
Willy Tarreau7c669d72008-06-20 15:04:11 +0200922 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100923 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200924 /* This stream was previously assigned to a server. We have to
925 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200926 * - if the server changed :
927 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200928 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200929 * - increment srv->redispatches and be->redispatches
930 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100931 */
932
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100933 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200934 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
935 s->txn->flags &= ~TX_CK_MASK;
936 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200937 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200938 s->flags |= SF_REDISP;
Olivier Houchard237f7812019-03-08 18:49:07 +0100939 _HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
940 _HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200941 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +0100942 _HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
943 _HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100944 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100945 }
946 }
947
Willy Tarreaubaaee002006-06-26 02:48:02 +0200948 switch (err) {
949 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200950 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100951 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100952 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200953 return SRV_STATUS_OK; /* dispatch or proxy mode */
954
955 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100956 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200957 return SRV_STATUS_OK;
958
Willy Tarreau87b09662015-04-03 00:22:06 +0200959 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200960 * connection slot yet. Either it is a redispatch, or it was
961 * assigned from persistence information (direct mode).
962 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200963 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200964 /* server scheduled for redirection, and already assigned. We
965 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100966 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100967 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100968 return SRV_STATUS_OK;
969 }
970
Willy Tarreau87b09662015-04-03 00:22:06 +0200971 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200972 * We know we have to queue it into the server's queue, so if a maxqueue
973 * is set on the server, we must also check that the server's queue is
974 * not full, in which case we have to return FULL.
975 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100976 if (srv->maxconn &&
977 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200978
Willy Tarreau827aee92011-03-10 16:55:02 +0100979 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200980 return SRV_STATUS_FULL;
981
Willy Tarreaubaaee002006-06-26 02:48:02 +0200982 p = pendconn_add(s);
983 if (p)
984 return SRV_STATUS_QUEUED;
985 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200986 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200987 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200988
989 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100990 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200991 return SRV_STATUS_OK;
992
993 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +0200994 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200995 p = pendconn_add(s);
996 if (p)
997 return SRV_STATUS_QUEUED;
998 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200999 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001000
1001 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +02001002 return err;
1003
Willy Tarreaubaaee002006-06-26 02:48:02 +02001004 case SRV_STATUS_INTERNAL:
1005 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001006
Willy Tarreaubaaee002006-06-26 02:48:02 +02001007 default:
1008 return SRV_STATUS_INTERNAL;
1009 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +01001010}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001011
Willy Tarreaub1d67742010-03-29 19:36:59 +02001012/* If an explicit source binding is specified on the server and/or backend, and
1013 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +02001014 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +01001015 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +02001016 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001017static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +02001018{
Willy Tarreau29fbe512015-08-20 19:35:14 +02001019#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001020 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001021 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001022 struct connection *cli_conn;
Olivier Houchard09a0f032019-01-17 15:59:13 +01001023 struct connection *srv_conn;
1024
1025 if (objt_cs(s->si[1].end))
1026 srv_conn = cs_conn(__objt_cs(s->si[1].end));
1027 else
1028 srv_conn = objt_conn(s->si[1].end);
Willy Tarreau827aee92011-03-10 16:55:02 +01001029
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001030 if (srv && srv->conn_src.opts & CO_SRC_BIND)
1031 src = &srv->conn_src;
1032 else if (s->be->conn_src.opts & CO_SRC_BIND)
1033 src = &s->be->conn_src;
1034 else
1035 return;
Willy Tarreau294c4732011-12-16 21:35:50 +01001036
Willy Tarreauca79f592019-07-17 19:04:47 +02001037 if (!sockaddr_alloc(&srv_conn->src))
1038 return;
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001039
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001040 switch (src->opts & CO_SRC_TPROXY_MASK) {
1041 case CO_SRC_TPROXY_ADDR:
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001042 *srv_conn->src = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001043 break;
1044 case CO_SRC_TPROXY_CLI:
1045 case CO_SRC_TPROXY_CIP:
1046 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001047 cli_conn = objt_conn(strm_orig(s));
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001048 if (cli_conn && conn_get_src(cli_conn))
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001049 *srv_conn->src = *cli_conn->src;
1050 else {
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001051 sockaddr_free(&srv_conn->src);
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001052 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001053 break;
1054 case CO_SRC_TPROXY_DYN:
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001055 if (src->bind_hdr_occ && IS_HTX_STRM(s)) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001056 char *vptr;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001057 size_t vlen;
Willy Tarreau294c4732011-12-16 21:35:50 +01001058
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001059 /* bind to the IP in a header */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001060 ((struct sockaddr_in *)srv_conn->src)->sin_family = AF_INET;
1061 ((struct sockaddr_in *)srv_conn->src)->sin_port = 0;
1062 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr = 0;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001063 if (http_get_htx_hdr(htxbuf(&s->req.buf),
1064 ist2(src->bind_hdr_name, src->bind_hdr_len),
1065 src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001066 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr =
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001067 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001068 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001069 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001070 break;
1071 default:
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001072 sockaddr_free(&srv_conn->src);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001073 }
1074#endif
1075}
1076
Willy Tarreaubaaee002006-06-26 02:48:02 +02001077/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001078 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001079 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001080 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001081 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001082 * - SF_ERR_NONE if everything's OK
1083 * - SF_ERR_SRVTO if there are no more servers
1084 * - SF_ERR_SRVCL if the connection was refused by the server
1085 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1086 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1087 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001088 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001089 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001090 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001091 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001092int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001093{
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001094 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001095 struct connection *srv_conn = NULL;
Olivier Houchard2442f682018-12-01 17:03:38 +01001096 struct conn_stream *srv_cs = NULL;
Willy Tarreaub0821862019-07-18 19:26:11 +02001097 struct sess_srv_list *srv_list;
Willy Tarreau827aee92011-03-10 16:55:02 +01001098 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001099 int reuse = 0;
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001100 int reuse_orphan = 0;
Olivier Houchard5cd62172019-01-04 15:52:26 +01001101 int init_mux = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001102 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001103
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001104
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001105 /* This will catch some corner cases such as lying connections resulting from
1106 * retries or connect timeouts but will rarely trigger.
Olivier Houchard0fa989f2018-12-05 17:08:55 +01001107 */
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001108 si_release_endpoint(&s->si[1]);
1109
Willy Tarreaub0821862019-07-18 19:26:11 +02001110 /* first, search for a matching connection in the session's idle conns */
1111 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
1112 if (srv_list->target == s->target) {
1113 list_for_each_entry(srv_conn, &srv_list->conn_list, session_list) {
1114 if (conn_xprt_ready(srv_conn) &&
1115 srv_conn->mux && (srv_conn->mux->avail_streams(srv_conn) > 0)) {
1116 reuse = 1;
1117 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001118 }
1119 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001120 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001121 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001122 }
Olivier Houchard351411f2018-12-27 17:20:54 +01001123
Olivier Houchard2444aa52020-01-20 13:56:01 +01001124 if (!reuse)
Willy Tarreaub0821862019-07-18 19:26:11 +02001125 srv_conn = NULL;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001126
Willy Tarreau7b004922015-08-04 19:34:21 +02001127 srv = objt_server(s->target);
Willy Tarreau34601a82013-12-15 16:33:46 +01001128
Willy Tarreau8dff9982015-08-04 20:45:52 +02001129 if (srv && !reuse) {
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001130 srv_conn = NULL;
Willy Tarreau8dff9982015-08-04 20:45:52 +02001131
Willy Tarreau449d74a2015-08-05 17:16:33 +02001132 /* Below we pick connections from the safe or idle lists based
1133 * on the strategy, the fact that this is a first or second
1134 * (retryable) request, with the indicated priority (1 or 2) :
1135 *
1136 * SAFE AGGR ALWS
1137 *
1138 * +-----+-----+ +-----+-----+ +-----+-----+
1139 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1140 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1141 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1142 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1143 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1144 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
Willy Tarreaub0821862019-07-18 19:26:11 +02001145 *
1146 * Idle conns are necessarily looked up on the same thread so
1147 * that there is no concurrency issues.
Willy Tarreau449d74a2015-08-05 17:16:33 +02001148 */
Christopher Faulet40a007c2017-07-03 15:41:01 +02001149 if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001150 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
1151 s->txn && (s->txn->flags & TX_NOT_FIRST))) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001152 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001153 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001154 else if (srv->safe_conns && !LIST_ISEMPTY(&srv->safe_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001155 ((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
1156 (s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR)) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001157 srv_conn = LIST_ELEM(srv->safe_conns[tid].n, struct connection *, list);
Willy Tarreau449d74a2015-08-05 17:16:33 +02001158 }
Christopher Faulet40a007c2017-07-03 15:41:01 +02001159 else if (srv->idle_conns && !LIST_ISEMPTY(&srv->idle_conns[tid]) &&
Willy Tarreau449d74a2015-08-05 17:16:33 +02001160 (s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) {
Christopher Faulet40a007c2017-07-03 15:41:01 +02001161 srv_conn = LIST_ELEM(srv->idle_conns[tid].n, struct connection *, list);
Olivier Houchard859dc802019-08-08 15:47:21 +02001162 } else if (srv->idle_orphan_conns && !MT_LIST_ISEMPTY(&srv->idle_orphan_conns[tid]) &&
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001163 (((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) ||
1164 (((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR) &&
1165 s->txn && (s->txn->flags & TX_NOT_FIRST)))) {
Olivier Houchard859dc802019-08-08 15:47:21 +02001166 srv_conn = MT_LIST_POP(&srv->idle_orphan_conns[tid],
Willy Tarreauc912f942019-02-28 16:06:56 +01001167 struct connection *, list);
1168 if (srv_conn)
Olivier Houchard7f1bc312019-01-22 16:11:03 +01001169 reuse_orphan = 1;
Willy Tarreau449d74a2015-08-05 17:16:33 +02001170 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001171
Willy Tarreau449d74a2015-08-05 17:16:33 +02001172 /* If we've picked a connection from the pool, we now have to
1173 * detach it. We may have to get rid of the previous idle
1174 * connection we had, so for this we try to swap it with the
1175 * other owner's. That way it may remain alive for others to
1176 * pick.
1177 */
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001178 if (srv_conn)
Willy Tarreau8dff9982015-08-04 20:45:52 +02001179 reuse = 1;
Willy Tarreau8dff9982015-08-04 20:45:52 +02001180 }
1181
Willy Tarreaub0821862019-07-18 19:26:11 +02001182
1183 /* here reuse might have been set above, indicating srv_conn finally
1184 * is OK.
1185 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001186 if (reuse) {
1187 /* Disable connection reuse if a dynamic source is used.
1188 * As long as we don't share connections between servers,
1189 * we don't need to disable connection reuse on no-idempotent
1190 * requests nor when PROXY protocol is used.
1191 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001192 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1193 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1194 reuse = 0;
1195 }
1196 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1197 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1198 reuse = 0;
1199 }
1200 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001201
Willy Tarreau911db9b2020-01-23 16:27:54 +01001202 if (((!reuse || (srv_conn && (srv_conn->flags & CO_FL_WAIT_XPRT)))
Christopher Faulet1dbc4672019-09-13 10:01:36 +02001203 && ha_used_fds > global.tune.pool_high_count) && srv && srv->idle_orphan_conns) {
Olivier Houchard88698d92019-04-16 19:07:22 +02001204 struct connection *tokill_conn;
1205
1206 /* We can't reuse a connection, and e have more FDs than deemd
1207 * acceptable, attempt to kill an idling connection
1208 */
1209 /* First, try from our own idle list */
Olivier Houchard859dc802019-08-08 15:47:21 +02001210 tokill_conn = MT_LIST_POP(&srv->idle_orphan_conns[tid],
Olivier Houchard88698d92019-04-16 19:07:22 +02001211 struct connection *, list);
1212 if (tokill_conn)
1213 tokill_conn->mux->destroy(tokill_conn->ctx);
1214 /* If not, iterate over other thread's idling pool, and try to grab one */
1215 else {
1216 int i;
1217
1218 for (i = 0; i < global.nbthread; i++) {
1219 if (i == tid)
1220 continue;
Willy Tarreau08e2b412019-05-26 11:50:08 +02001221
1222 // just silence stupid gcc which reports an absurd
1223 // out-of-bounds warning for <i> which is always
1224 // exactly zero without threads, but it seems to
1225 // see it possibly larger.
1226 ALREADY_CHECKED(i);
1227
Olivier Houchard14023742019-12-30 18:15:40 +01001228 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard859dc802019-08-08 15:47:21 +02001229 tokill_conn = MT_LIST_POP(&srv->idle_orphan_conns[i],
Olivier Houchard88698d92019-04-16 19:07:22 +02001230 struct connection *, list);
1231 if (tokill_conn) {
1232 /* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
1233
Olivier Houchard859dc802019-08-08 15:47:21 +02001234 MT_LIST_ADDQ(&toremove_connections[i],
1235 (struct mt_list *)&tokill_conn->list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001236 task_wakeup(idle_conn_cleanup[i], TASK_WOKEN_OTHER);
Olivier Houchard849d4f02020-01-31 17:22:08 +01001237 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001238 break;
1239 }
Olivier Houchard14023742019-12-30 18:15:40 +01001240 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001241 }
1242 }
1243
1244 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001245 /* If we're really reusing the connection, remove it from the orphan
1246 * list and add it back to the idle list.
1247 */
Christopher Faulet46451d62019-04-19 15:39:22 +02001248 if (reuse) {
1249 if (reuse_orphan) {
1250 srv_conn->idle_time = 0;
1251 _HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
1252 __ha_barrier_atomic_store();
1253 srv->curr_idle_thr[tid]--;
1254 LIST_ADDQ(&srv->idle_conns[tid], &srv_conn->list);
1255 }
1256 else {
1257 if (srv_conn->flags & CO_FL_SESS_IDLE) {
1258 struct session *sess = srv_conn->owner;
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001259
Christopher Faulet46451d62019-04-19 15:39:22 +02001260 srv_conn->flags &= ~CO_FL_SESS_IDLE;
1261 sess->idle_conns--;
1262 }
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001263 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001264 }
Willy Tarreau34601a82013-12-15 16:33:46 +01001265
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001266 if (reuse) {
Willy Tarreaub0821862019-07-18 19:26:11 +02001267 if (srv_conn->mux) {
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001268 int avail = srv_conn->mux->avail_streams(srv_conn);
1269
1270 if (avail <= 1) {
Olivier Houchard2442f682018-12-01 17:03:38 +01001271 /* No more streams available, remove it from the list */
1272 LIST_DEL(&srv_conn->list);
1273 LIST_INIT(&srv_conn->list);
1274 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001275
1276 if (avail >= 1) {
1277 srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001278 if (srv_cs)
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001279 si_attach_cs(&s->si[1], srv_cs);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001280 else
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001281 srv_conn = NULL;
1282 }
Olivier Houchard134a2042018-12-28 14:45:47 +01001283 else
1284 srv_conn = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001285 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001286 /* otherwise srv_conn is left intact */
1287 }
1288 else
1289 srv_conn = NULL;
1290
1291 /* no reuse or failed to reuse the connection above, pick a new one */
1292 if (!srv_conn) {
1293 srv_conn = conn_new();
Willy Tarreau1da41ec2019-02-01 16:38:48 +01001294 if (srv_conn)
1295 srv_conn->target = s->target;
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001296 srv_cs = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001297 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001298
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001299 if (!srv_conn || !sockaddr_alloc(&srv_conn->dst))
Willy Tarreaue7dff022015-04-03 01:14:29 +02001300 return SF_ERR_RESOURCE;
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001301
Willy Tarreaue7dff022015-04-03 01:14:29 +02001302 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001303 err = assign_server_address(s);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001304 if (err != SRV_STATUS_OK)
Willy Tarreaue7dff022015-04-03 01:14:29 +02001305 return SF_ERR_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001306 }
1307
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001308 /* copy the target address into the connection */
1309 *srv_conn->dst = *s->target_addr;
1310
1311 /* Copy network namespace from client connection */
1312 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
1313
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001314 if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001315 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001316 if (srv)
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001317 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001318 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1319 /* proxies exclusively run on raw_sock right now */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001320 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
Olivier Houchard12950162018-11-23 14:32:08 +01001321 if (!(srv_conn->ctrl))
Willy Tarreaue7dff022015-04-03 01:14:29 +02001322 return SF_ERR_INTERNAL;
Willy Tarreauff605db2013-12-20 11:09:51 +01001323 }
1324 else
Willy Tarreaue7dff022015-04-03 01:14:29 +02001325 return SF_ERR_INTERNAL; /* how did we get there ? */
Willy Tarreaud02394b2012-05-11 18:32:18 +02001326
Olivier Houchard8af03b32020-01-22 17:34:54 +01001327 srv_cs = si_alloc_cs(&s->si[1], srv_conn);
1328 if (!srv_cs) {
1329 conn_free(srv_conn);
1330 return SF_ERR_RESOURCE;
1331 }
1332 srv_conn->ctx = srv_cs;
Olivier Houchardecffb7d2020-01-24 14:10:55 +01001333#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
Olivier Houchard12950162018-11-23 14:32:08 +01001334 if (!srv ||
1335 ((!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
Olivier Houchardb4a8b2c2019-06-15 00:13:15 +02001336 srv->mux_proto || s->be->mode != PR_MODE_HTTP))
Olivier Houchard201b9f42018-11-21 00:16:29 +01001337#endif
Olivier Houchard5cd62172019-01-04 15:52:26 +01001338 init_mux = 1;
Willy Tarreauff605db2013-12-20 11:09:51 +01001339 /* process the case where the server requires the PROXY protocol to be sent */
1340 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001341
Willy Tarreau7b004922015-08-04 19:34:21 +02001342 if (srv && srv->pp_opts) {
Willy Tarreau387ebf82015-08-04 19:24:13 +02001343 srv_conn->flags |= CO_FL_PRIVATE;
Alexander Liu2a54bb72019-05-22 19:44:48 +08001344 srv_conn->flags |= CO_FL_SEND_PROXY;
Willy Tarreauff605db2013-12-20 11:09:51 +01001345 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001346 if (cli_conn)
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001347 conn_get_dst(cli_conn);
Willy Tarreauff605db2013-12-20 11:09:51 +01001348 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001349
Willy Tarreauff605db2013-12-20 11:09:51 +01001350 assign_tproxy_address(s);
Alexander Liu2a54bb72019-05-22 19:44:48 +08001351
1352 if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
1353 srv_conn->send_proxy_ofs = 1;
1354 srv_conn->flags |= CO_FL_SOCKS4;
1355 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001356 }
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001357 else if (!conn_xprt_ready(srv_conn)) {
1358 if (srv_conn->mux->reset)
1359 srv_conn->mux->reset(srv_conn);
1360 }
Olivier Houcharde8f5f5d2019-10-25 17:00:54 +02001361 else {
1362 /* Only consider we're doing reuse if the connection was
1363 * ready.
1364 */
1365 if (srv_conn->mux->ctl(srv_conn, MUX_STATUS, NULL) & MUX_STATUS_READY)
1366 s->flags |= SF_SRV_REUSED;
1367 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001368
William Lallemandb7ff6a32012-03-02 14:35:21 +01001369 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001370 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001371 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001372
Willy Tarreau14f8e862012-08-30 22:23:13 +02001373 /* disable lingering */
1374 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001375 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001376
Willy Tarreauf1573842018-12-14 11:35:36 +01001377 if (s->flags & SF_SRV_REUSED) {
Olivier Houchard237f7812019-03-08 18:49:07 +01001378 _HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001379 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001380 _HA_ATOMIC_ADD(&srv->counters.reuse, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001381 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +01001382 _HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001383 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001384 _HA_ATOMIC_ADD(&srv->counters.connect, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001385 }
1386
Olivier Houchard201b9f42018-11-21 00:16:29 +01001387 err = si_connect(&s->si[1], srv_conn);
Willy Tarreau09e02032019-07-18 16:18:20 +02001388 if (err != SF_ERR_NONE)
1389 return err;
1390
Olivier Houchard5cd62172019-01-04 15:52:26 +01001391 /* We have to defer the mux initialization until after si_connect()
1392 * has been called, as we need the xprt to have been properly
1393 * initialized, or any attempt to recv during the mux init may
1394 * fail, and flag the connection as CO_FL_ERROR.
1395 */
1396 if (init_mux) {
Olivier Houchard74931142019-01-29 19:11:16 +01001397 if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
1398 conn_full_close(srv_conn);
Olivier Houchard5cd62172019-01-04 15:52:26 +01001399 return SF_ERR_INTERNAL;
Olivier Houchard74931142019-01-29 19:11:16 +01001400 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001401 /* If we're doing http-reuse always, and the connection
1402 * is an http2 connection, add it to the available list,
1403 * so that others can use it right away.
1404 */
1405 if (srv && ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
1406 srv_conn->mux->avail_streams(srv_conn) > 0)
1407 LIST_ADD(&srv->idle_conns[tid], &srv_conn->list);
1408 }
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001409 /* The CO_FL_SEND_PROXY flag may have been set by the connect method,
1410 * if so, add our handshake pseudo-XPRT now.
1411 */
Willy Tarreau4450b582020-01-23 15:23:13 +01001412 if ((srv_conn->flags & CO_FL_HANDSHAKE)) {
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001413 if (xprt_add_hs(srv_conn) < 0) {
1414 conn_full_close(srv_conn);
1415 return SF_ERR_INTERNAL;
1416 }
1417 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001418
Willy Tarreaubaaee002006-06-26 02:48:02 +02001419
Willy Tarreau5db847a2019-05-09 14:13:35 +02001420#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
Olivier Houchard4cd2af42019-05-06 15:18:27 +02001421
Olivier Houchard8694e5b2019-06-15 00:14:05 +02001422 if (!reuse && cli_conn && srv && srv_conn->mux &&
Olivier Houchard522eea72017-11-03 16:27:47 +01001423 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
Olivier Houchard865d8392019-05-03 22:46:27 +02001424 /* Only attempt to use early data if either the client sent
1425 * early data, so that we know it can handle a 425, or if
1426 * we are allwoed to retry requests on early data failure, and
1427 * it's our first try
1428 */
1429 ((cli_conn->flags & CO_FL_EARLY_DATA) ||
1430 ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
1431 s->si[1].conn_retries == s->be->conn_retries)) &&
1432 !channel_is_empty(si_oc(&s->si[1])) &&
1433 srv_conn->flags & CO_FL_SSL_WAIT_HS)
Olivier Houchard522eea72017-11-03 16:27:47 +01001434 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001435#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001436
Willy Tarreau14f8e862012-08-30 22:23:13 +02001437 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001438 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001439
Willy Tarreau827aee92011-03-10 16:55:02 +01001440 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001441 int count;
1442
Willy Tarreaue7dff022015-04-03 01:14:29 +02001443 s->flags |= SF_CURR_SESS;
Olivier Houchard237f7812019-03-08 18:49:07 +01001444 count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +02001445 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau51406232008-03-10 22:04:20 +01001446 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001447 s->be->lbprm.server_take_conn(srv);
Willy Tarreau732eac42015-07-09 11:40:25 +02001448
1449#ifdef USE_OPENSSL
1450 if (srv->ssl_ctx.sni) {
1451 struct sample *smp;
Willy Tarreau732eac42015-07-09 11:40:25 +02001452
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001453 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
1454 srv->ssl_ctx.sni, SMP_T_STR);
Willy Tarreau2e0565c2016-08-09 11:55:21 +02001455 if (smp_make_safe(smp)) {
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001456 ssl_sock_set_servername(srv_conn,
1457 smp->data.u.str.area);
Willy Tarreau387ebf82015-08-04 19:24:13 +02001458 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreau732eac42015-07-09 11:40:25 +02001459 }
1460 }
1461#endif /* USE_OPENSSL */
1462
Willy Tarreaubaaee002006-06-26 02:48:02 +02001463 }
1464
Willy Tarreauada4c582020-03-04 16:42:03 +01001465 /* Now handle synchronously connected sockets. We know the stream-int
1466 * is at least in state SI_ST_CON. These ones typically are UNIX
1467 * sockets, socket pairs, and occasionally TCP connections on the
1468 * loopback on a heavily loaded system.
1469 */
1470 if ((srv_conn->flags & CO_FL_ERROR || srv_cs->flags & CS_FL_ERROR))
1471 s->si[1].flags |= SI_FL_ERR;
1472
1473 /* If we had early data, and the handshake ended, then
1474 * we can remove the flag, and attempt to wake the task up,
1475 * in the event there's an analyser waiting for the end of
1476 * the handshake.
1477 */
1478 if (!(srv_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)))
1479 srv_cs->flags &= ~CS_FL_WAIT_FOR_HS;
1480
1481 if (!si_state_in(s->si[1].state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) &&
1482 (srv_conn->flags & CO_FL_WAIT_XPRT) == 0) {
1483 s->si[1].exp = TICK_ETERNITY;
1484 si_oc(&s->si[1])->flags |= CF_WRITE_NULL;
1485 if (s->si[1].state == SI_ST_CON)
1486 s->si[1].state = SI_ST_RDY;
1487 }
1488
1489 /* Report EOI on the channel if it was reached from the mux point of
1490 * view.
1491 *
1492 * Note: This test is only required because si_cs_process is also the SI
1493 * wake callback. Otherwise si_cs_recv()/si_cs_send() already take
1494 * care of it.
1495 */
1496 if ((srv_cs->flags & CS_FL_EOI) && !(si_ic(&s->si[1])->flags & CF_EOI))
1497 si_ic(&s->si[1])->flags |= (CF_EOI|CF_READ_PARTIAL);
1498
Willy Tarreaue7dff022015-04-03 01:14:29 +02001499 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001500}
1501
1502
Willy Tarreaubaaee002006-06-26 02:48:02 +02001503/* This function performs the "redispatch" part of a connection attempt. It
1504 * will assign a server if required, queue the connection if required, and
1505 * handle errors that might arise at this level. It can change the server
1506 * state. It will return 1 if it encounters an error, switches the server
1507 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1508 * that the connection is ready to use.
1509 */
1510
Willy Tarreau87b09662015-04-03 00:22:06 +02001511int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001512{
Willy Tarreau827aee92011-03-10 16:55:02 +01001513 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001514 int conn_err;
1515
1516 /* We know that we don't have any connection pending, so we will
1517 * try to get a new one, and wait in this state if it's queued
1518 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001519 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001520 conn_err = assign_server_and_queue(s);
1521 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001522
Willy Tarreaubaaee002006-06-26 02:48:02 +02001523 switch (conn_err) {
1524 case SRV_STATUS_OK:
1525 break;
1526
Willy Tarreau7c669d72008-06-20 15:04:11 +02001527 case SRV_STATUS_FULL:
1528 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1529 * and we can redispatch to another server, or it is not and we return
1530 * 503. This only makes sense in DIRECT mode however, because normal LB
1531 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001532 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001533 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001534 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001535 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001536 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001537 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001538 sockaddr_free(&s->target_addr);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001539 goto redispatch;
1540 }
1541
Willy Tarreau350f4872014-11-28 14:42:25 +01001542 if (!s->si[1].err_type) {
1543 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001544 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001545
Olivier Houchard237f7812019-03-08 18:49:07 +01001546 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1547 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001548 return 1;
1549
Willy Tarreaubaaee002006-06-26 02:48:02 +02001550 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001551 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001552 if (!s->si[1].err_type) {
1553 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001554 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001555
Olivier Houchard237f7812019-03-08 18:49:07 +01001556 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001557 return 1;
1558
1559 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001560 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1561 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001562 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001563 return 1;
1564
Willy Tarreaubaaee002006-06-26 02:48:02 +02001565 case SRV_STATUS_INTERNAL:
1566 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001567 if (!s->si[1].err_type) {
1568 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001569 }
1570
Willy Tarreau827aee92011-03-10 16:55:02 +01001571 if (srv)
1572 srv_inc_sess_ctr(srv);
1573 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001574 srv_set_sess_last(srv);
1575 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001576 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1577 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001578
Willy Tarreau87b09662015-04-03 00:22:06 +02001579 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001580 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001581 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001582 return 1;
1583 }
1584 /* if we get here, it's because we got SRV_STATUS_OK, which also
1585 * means that the connection has not been queued.
1586 */
1587 return 0;
1588}
1589
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001590/* Check if the connection request is in such a state that it can be aborted. */
1591static int back_may_abort_req(struct channel *req, struct stream *s)
1592{
1593 return ((req->flags & (CF_READ_ERROR)) ||
1594 ((req->flags & (CF_SHUTW_NOW|CF_SHUTW)) && /* empty and client aborted */
1595 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE))));
1596}
1597
1598/* Update back stream interface status for input states SI_ST_ASS, SI_ST_QUE,
1599 * SI_ST_TAR. Other input states are simply ignored.
1600 * Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON
1601 * and SI_ST_EST. Flags must have previously been updated for timeouts and other
1602 * conditions.
1603 */
1604void back_try_conn_req(struct stream *s)
1605{
1606 struct server *srv = objt_server(s->target);
1607 struct stream_interface *si = &s->si[1];
1608 struct channel *req = &s->req;
1609
1610 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1611
1612 if (si->state == SI_ST_ASS) {
1613 /* Server assigned to connection request, we have to try to connect now */
1614 int conn_err;
1615
1616 /* Before we try to initiate the connection, see if the
1617 * request may be aborted instead.
1618 */
1619 if (back_may_abort_req(req, s)) {
1620 si->err_type |= SI_ET_CONN_ABRT;
1621 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1622 goto abort_connection;
1623 }
1624
1625 conn_err = connect_server(s);
1626 srv = objt_server(s->target);
1627
1628 if (conn_err == SF_ERR_NONE) {
1629 /* state = SI_ST_CON or SI_ST_EST now */
1630 if (srv)
1631 srv_inc_sess_ctr(srv);
1632 if (srv)
1633 srv_set_sess_last(srv);
1634 DBG_TRACE_STATE("connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1635 goto end;
1636 }
1637
1638 /* We have received a synchronous error. We might have to
1639 * abort, retry immediately or redispatch.
1640 */
1641 if (conn_err == SF_ERR_INTERNAL) {
1642 if (!si->err_type) {
1643 si->err_type = SI_ET_CONN_OTHER;
1644 }
1645
1646 if (srv)
1647 srv_inc_sess_ctr(srv);
1648 if (srv)
1649 srv_set_sess_last(srv);
1650 if (srv)
1651 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1652 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1653
1654 /* release other streams waiting for this server */
1655 sess_change_server(s, NULL);
1656 if (may_dequeue_tasks(srv, s->be))
1657 process_srv_queue(srv);
1658
1659 /* Failed and not retryable. */
1660 si_shutr(si);
1661 si_shutw(si);
1662 req->flags |= CF_WRITE_ERROR;
1663
1664 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1665
1666 /* we may need to know the position in the queue for logging */
1667 pendconn_cond_unlink(s->pend_pos);
1668
1669 /* no stream was ever accounted for this server */
1670 si->state = SI_ST_CLO;
1671 if (s->srv_error)
1672 s->srv_error(s, si);
1673 DBG_TRACE_STATE("internal error during connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1674 goto end;
1675 }
1676
1677 /* We are facing a retryable error, but we don't want to run a
1678 * turn-around now, as the problem is likely a source port
1679 * allocation problem, so we want to retry now.
1680 */
1681 si->state = SI_ST_CER;
1682 si->flags &= ~SI_FL_ERR;
1683 back_handle_st_cer(s);
1684
1685 DBG_TRACE_STATE("connection error, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1686 /* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
1687 }
1688 else if (si->state == SI_ST_QUE) {
1689 /* connection request was queued, check for any update */
1690 if (!pendconn_dequeue(s)) {
1691 /* The connection is not in the queue anymore. Either
1692 * we have a server connection slot available and we
1693 * go directly to the assigned state, or we need to
1694 * load-balance first and go to the INI state.
1695 */
1696 si->exp = TICK_ETERNITY;
1697 if (unlikely(!(s->flags & SF_ASSIGNED)))
1698 si->state = SI_ST_REQ;
1699 else {
1700 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1701 si->state = SI_ST_ASS;
1702 }
1703 DBG_TRACE_STATE("dequeue connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1704 goto end;
1705 }
1706
1707 /* Connection request still in queue... */
1708 if (si->flags & SI_FL_EXP) {
1709 /* ... and timeout expired */
1710 si->exp = TICK_ETERNITY;
1711 si->flags &= ~SI_FL_EXP;
1712 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1713
1714 /* we may need to know the position in the queue for logging */
1715 pendconn_cond_unlink(s->pend_pos);
1716
1717 if (srv)
1718 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1719 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1720 si_shutr(si);
1721 si_shutw(si);
1722 req->flags |= CF_WRITE_TIMEOUT;
1723 if (!si->err_type)
1724 si->err_type = SI_ET_QUEUE_TO;
1725 si->state = SI_ST_CLO;
1726 if (s->srv_error)
1727 s->srv_error(s, si);
1728 DBG_TRACE_STATE("connection request still queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1729 goto end;
1730 }
1731
1732 /* Connection remains in queue, check if we have to abort it */
1733 if (back_may_abort_req(req, s)) {
1734 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1735
1736 /* we may need to know the position in the queue for logging */
1737 pendconn_cond_unlink(s->pend_pos);
1738
1739 si->err_type |= SI_ET_QUEUE_ABRT;
1740 DBG_TRACE_STATE("abort queued connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1741 goto abort_connection;
1742 }
1743
1744 /* Nothing changed */
1745 }
1746 else if (si->state == SI_ST_TAR) {
1747 /* Connection request might be aborted */
1748 if (back_may_abort_req(req, s)) {
1749 si->err_type |= SI_ET_CONN_ABRT;
1750 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1751 goto abort_connection;
1752 }
1753
1754 if (!(si->flags & SI_FL_EXP))
1755 return; /* still in turn-around */
1756
1757 si->flags &= ~SI_FL_EXP;
1758 si->exp = TICK_ETERNITY;
1759
1760 /* we keep trying on the same server as long as the stream is
1761 * marked "assigned".
1762 * FIXME: Should we force a redispatch attempt when the server is down ?
1763 */
1764 if (s->flags & SF_ASSIGNED)
1765 si->state = SI_ST_ASS;
1766 else
1767 si->state = SI_ST_REQ;
1768
1769 DBG_TRACE_STATE("retry connection now", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1770 }
1771
1772 end:
1773 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1774 return;
1775
1776abort_connection:
1777 /* give up */
1778 si->exp = TICK_ETERNITY;
1779 si->flags &= ~SI_FL_EXP;
1780 si_shutr(si);
1781 si_shutw(si);
1782 si->state = SI_ST_CLO;
1783 if (s->srv_error)
1784 s->srv_error(s, si);
1785 DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1786 return;
1787}
1788
1789/* This function initiates a server connection request on a stream interface
1790 * already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS for
1791 * a real connection to a server, indicating that a server has been assigned,
1792 * or SI_ST_EST for a successful connection to an applet. It may also return
1793 * SI_ST_QUE, or SI_ST_CLO upon error.
1794 */
1795void back_handle_st_req(struct stream *s)
1796{
1797 struct stream_interface *si = &s->si[1];
1798
1799 if (si->state != SI_ST_REQ)
1800 return;
1801
1802 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1803
1804 if (unlikely(obj_type(s->target) == OBJ_TYPE_APPLET)) {
1805 /* the applet directly goes to the EST state */
1806 struct appctx *appctx = objt_appctx(si->end);
1807
1808 if (!appctx || appctx->applet != __objt_applet(s->target))
1809 appctx = si_register_handler(si, objt_applet(s->target));
1810
1811 if (!appctx) {
1812 /* No more memory, let's immediately abort. Force the
1813 * error code to ignore the ERR_LOCAL which is not a
1814 * real error.
1815 */
1816 s->flags &= ~(SF_ERR_MASK | SF_FINST_MASK);
1817
1818 si_shutr(si);
1819 si_shutw(si);
1820 s->req.flags |= CF_WRITE_ERROR;
1821 si->err_type = SI_ET_CONN_RES;
1822 si->state = SI_ST_CLO;
1823 if (s->srv_error)
1824 s->srv_error(s, si);
1825 DBG_TRACE_STATE("failed to register applet", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1826 goto end;
1827 }
1828
1829 if (tv_iszero(&s->logs.tv_request))
1830 s->logs.tv_request = now;
1831 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1832 si->state = SI_ST_EST;
1833 si->err_type = SI_ET_NONE;
1834 be_set_sess_last(s->be);
1835
1836 DBG_TRACE_STATE("applet registered", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1837 /* let back_establish() finish the job */
1838 goto end;
1839 }
1840
1841 /* Try to assign a server */
1842 if (srv_redispatch_connect(s) != 0) {
1843 /* We did not get a server. Either we queued the
1844 * connection request, or we encountered an error.
1845 */
1846 if (si->state == SI_ST_QUE) {
1847 DBG_TRACE_STATE("connection request queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1848 goto end;
1849 }
1850
1851 /* we did not get any server, let's check the cause */
1852 si_shutr(si);
1853 si_shutw(si);
1854 s->req.flags |= CF_WRITE_ERROR;
1855 if (!si->err_type)
1856 si->err_type = SI_ET_CONN_OTHER;
1857 si->state = SI_ST_CLO;
1858 if (s->srv_error)
1859 s->srv_error(s, si);
1860 DBG_TRACE_STATE("connection request failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1861 goto end;
1862 }
1863
1864 /* The server is assigned */
1865 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1866 si->state = SI_ST_ASS;
1867 be_set_sess_last(s->be);
1868 DBG_TRACE_STATE("connection request assigned to a server", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1869
1870 end:
1871 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1872}
1873
1874/* This function is called with (si->state == SI_ST_CON) meaning that a
1875 * connection was attempted and that the file descriptor is already allocated.
1876 * We must check for timeout, error and abort. Possible output states are
1877 * SI_ST_CER (error), SI_ST_DIS (abort), and SI_ST_CON (no change). This only
1878 * works with connection-based streams. We know that there were no I/O event
1879 * when reaching this function. Timeouts and errors are *not* cleared.
1880 */
1881void back_handle_st_con(struct stream *s)
1882{
1883 struct stream_interface *si = &s->si[1];
1884 struct channel *req = &s->req;
1885 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001886
1887 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1888
1889 /* the client might want to abort */
1890 if ((rep->flags & CF_SHUTW) ||
1891 ((req->flags & CF_SHUTW_NOW) &&
1892 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
1893 si->flags |= SI_FL_NOLINGER;
1894 si_shutw(si);
1895 si->err_type |= SI_ET_CONN_ABRT;
1896 if (s->srv_error)
1897 s->srv_error(s, si);
1898 /* Note: state = SI_ST_DIS now */
1899 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
Willy Tarreau062df2c2020-01-10 06:17:03 +01001900 goto end;
1901 }
1902
Willy Tarreau062df2c2020-01-10 06:17:03 +01001903 done:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001904 /* retryable error ? */
Willy Tarreau062df2c2020-01-10 06:17:03 +01001905 if (si->flags & (SI_FL_EXP|SI_FL_ERR)) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001906 if (!si->err_type) {
1907 if (si->flags & SI_FL_ERR)
1908 si->err_type = SI_ET_CONN_ERR;
1909 else
1910 si->err_type = SI_ET_CONN_TO;
1911 }
1912
1913 si->state = SI_ST_CER;
1914 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1915 }
1916
Willy Tarreau062df2c2020-01-10 06:17:03 +01001917 end:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001918 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1919}
1920
1921/* This function is called with (si->state == SI_ST_CER) meaning that a
1922 * previous connection attempt has failed and that the file descriptor
1923 * has already been released. Possible causes include asynchronous error
1924 * notification and time out. Possible output states are SI_ST_CLO when
1925 * retries are exhausted, SI_ST_TAR when a delay is wanted before a new
1926 * connection attempt, SI_ST_ASS when it's wise to retry on the same server,
1927 * and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
1928 * marked as in error state. Timeouts and errors are cleared before retrying.
1929 */
1930void back_handle_st_cer(struct stream *s)
1931{
1932 struct stream_interface *si = &s->si[1];
1933 struct conn_stream *cs = objt_cs(si->end);
1934 struct connection *conn = cs_conn(cs);
1935
1936 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1937
1938 si->exp = TICK_ETERNITY;
1939 si->flags &= ~SI_FL_EXP;
1940
1941 /* we probably have to release last stream from the server */
1942 if (objt_server(s->target)) {
1943 health_adjust(objt_server(s->target), HANA_STATUS_L4_ERR);
1944
1945 if (s->flags & SF_CURR_SESS) {
1946 s->flags &= ~SF_CURR_SESS;
1947 _HA_ATOMIC_SUB(&__objt_server(s->target)->cur_sess, 1);
1948 }
1949
1950 if ((si->flags & SI_FL_ERR) &&
1951 conn && conn->err_code == CO_ER_SSL_MISMATCH_SNI) {
1952 /* We tried to connect to a server which is configured
1953 * with "verify required" and which doesn't have the
1954 * "verifyhost" directive. The server presented a wrong
1955 * certificate (a certificate for an unexpected name),
1956 * which implies that we have used SNI in the handshake,
1957 * and that the server doesn't have the associated cert
1958 * and presented a default one.
1959 *
1960 * This is a serious enough issue not to retry. It's
1961 * especially important because this wrong name might
1962 * either be the result of a configuration error, and
1963 * retrying will only hammer the server, or is caused
1964 * by the use of a wrong SNI value, most likely
1965 * provided by the client and we don't want to let the
1966 * client provoke retries.
1967 */
1968 si->conn_retries = 0;
1969 DBG_TRACE_DEVEL("Bad SSL cert, disable connection retries", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1970 }
1971 }
1972
1973 /* ensure that we have enough retries left */
1974 si->conn_retries--;
1975 if (si->conn_retries < 0 || !(s->be->retry_type & PR_RE_CONN_FAILED)) {
1976 if (!si->err_type) {
1977 si->err_type = SI_ET_CONN_ERR;
1978 }
1979
1980 if (objt_server(s->target))
1981 _HA_ATOMIC_ADD(&objt_server(s->target)->counters.failed_conns, 1);
1982 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1983 sess_change_server(s, NULL);
1984 if (may_dequeue_tasks(objt_server(s->target), s->be))
1985 process_srv_queue(objt_server(s->target));
1986
1987 /* shutw is enough so stop a connecting socket */
1988 si_shutw(si);
1989 s->req.flags |= CF_WRITE_ERROR;
1990 s->res.flags |= CF_READ_ERROR;
1991
1992 si->state = SI_ST_CLO;
1993 if (s->srv_error)
1994 s->srv_error(s, si);
1995
1996 DBG_TRACE_STATE("connection failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1997 goto end;
1998 }
1999
2000 stream_choose_redispatch(s);
2001
2002 if (si->flags & SI_FL_ERR) {
2003 /* The error was an asynchronous connection error, and we will
2004 * likely have to retry connecting to the same server, most
2005 * likely leading to the same result. To avoid this, we wait
2006 * MIN(one second, connect timeout) before retrying. We don't
2007 * do it when the failure happened on a reused connection
2008 * though.
2009 */
2010
2011 int delay = 1000;
2012
2013 if (s->be->timeout.connect && s->be->timeout.connect < delay)
2014 delay = s->be->timeout.connect;
2015
2016 if (!si->err_type)
2017 si->err_type = SI_ET_CONN_ERR;
2018
2019 /* only wait when we're retrying on the same server */
2020 if ((si->state == SI_ST_ASS ||
2021 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_RR ||
2022 (s->be->srv_act <= 1)) && !(s->flags & SF_SRV_REUSED)) {
2023 si->state = SI_ST_TAR;
2024 si->exp = tick_add(now_ms, MS_TO_TICKS(delay));
2025 }
2026 si->flags &= ~SI_FL_ERR;
2027 DBG_TRACE_STATE("retry a new connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2028 }
2029
2030 end:
2031 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2032}
2033
2034/* This function is called with (si->state == SI_ST_RDY) meaning that a
2035 * connection was attempted, that the file descriptor is already allocated,
2036 * and that it has succeeded. We must still check for errors and aborts.
2037 * Possible output states are SI_ST_EST (established), SI_ST_CER (error),
2038 * and SI_ST_DIS (abort). This only works with connection-based streams.
2039 * Timeouts and errors are *not* cleared.
2040 */
2041void back_handle_st_rdy(struct stream *s)
2042{
2043 struct stream_interface *si = &s->si[1];
2044 struct channel *req = &s->req;
2045 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002046
2047 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2048 /* We know the connection at least succeeded, though it could have
2049 * since met an error for any other reason. At least it didn't time out
2050 * eventhough the timeout might have been reported right after success.
2051 * We need to take care of various situations here :
2052 * - everything might be OK. We have to switch to established.
2053 * - an I/O error might have been reported after a successful transfer,
2054 * which is not retryable and needs to be logged correctly, and needs
2055 * established as well
2056 * - SI_ST_CON implies !CF_WROTE_DATA but not conversely as we could
2057 * have validated a connection with incoming data (e.g. TCP with a
2058 * banner protocol), or just a successful connect() probe.
2059 * - the client might have requested a connection abort, this needs to
2060 * be checked before we decide to retry anything.
2061 */
2062
2063 /* it's still possible to handle client aborts or connection retries
2064 * before any data were sent.
2065 */
2066 if (!(req->flags & CF_WROTE_DATA)) {
2067 /* client abort ? */
2068 if ((rep->flags & CF_SHUTW) ||
2069 ((req->flags & CF_SHUTW_NOW) &&
2070 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2071 /* give up */
2072 si->flags |= SI_FL_NOLINGER;
2073 si_shutw(si);
2074 si->err_type |= SI_ET_CONN_ABRT;
2075 if (s->srv_error)
2076 s->srv_error(s, si);
2077 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2078 goto end;
2079 }
2080
2081 /* retryable error ? */
2082 if (si->flags & SI_FL_ERR) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002083 if (!si->err_type)
2084 si->err_type = SI_ET_CONN_ERR;
2085 si->state = SI_ST_CER;
2086 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2087 goto end;
2088 }
2089 }
2090
2091 /* data were sent and/or we had no error, back_establish() will
2092 * now take over.
2093 */
2094 DBG_TRACE_STATE("connection established", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2095 si->err_type = SI_ET_NONE;
2096 si->state = SI_ST_EST;
2097
2098 end:
2099 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2100}
2101
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002102/* sends a log message when a backend goes down, and also sets last
2103 * change date.
2104 */
2105void set_backend_down(struct proxy *be)
2106{
2107 be->last_change = now.tv_sec;
Olivier Houchard237f7812019-03-08 18:49:07 +01002108 _HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002109
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002110 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01002111 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002112 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
2113 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002114}
2115
Willy Tarreau87b09662015-04-03 00:22:06 +02002116/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002117 * tries to extract an RDP cookie from the request buffer, and look for the
2118 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02002119 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002120 * list. Nothing is performed if a server was already assigned.
2121 */
Willy Tarreau87b09662015-04-03 00:22:06 +02002122int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002123{
2124 struct proxy *px = s->be;
2125 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02002126 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002127 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01002128 uint16_t port;
2129 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002130 char *p;
2131
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002132 DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002133
Willy Tarreaue7dff022015-04-03 01:14:29 +02002134 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002135 goto no_cookie;
2136
Willy Tarreau37406352012-04-23 16:16:37 +02002137 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002138
Willy Tarreaucadd8c92013-07-22 18:09:52 +02002139 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002140 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002141 goto no_cookie;
2142
Willy Tarreau04276f32017-01-06 17:41:29 +01002143 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
2144 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
2145 * server's IP address in network order, and "port" is the integer corresponding to the
2146 * server's port in network order. Comments please Emeric.
2147 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002148 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002149 if (*p != '.')
2150 goto no_cookie;
2151 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01002152
2153 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002154 if (*p != '.')
2155 goto no_cookie;
2156
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002157 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002158 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02002159 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01002160 port == srv->svc_port &&
2161 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002162 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002163 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02002164 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002165 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002166 break;
2167 }
2168 }
2169 srv = srv->next;
2170 }
2171
2172no_cookie:
2173 req->analysers &= ~an_bit;
2174 req->analyse_exp = TICK_ETERNITY;
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002175 DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002176 return 1;
2177}
2178
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002179int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01002180 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002181 return px->down_time;
2182
2183 return now.tv_sec - px->last_change + px->down_time;
2184}
Willy Tarreaubaaee002006-06-26 02:48:02 +02002185
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002186/*
2187 * This function returns a string containing the balancing
2188 * mode of the proxy in a format suitable for stats.
2189 */
2190
2191const char *backend_lb_algo_str(int algo) {
2192
2193 if (algo == BE_LB_ALGO_RR)
2194 return "roundrobin";
2195 else if (algo == BE_LB_ALGO_SRR)
2196 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01002197 else if (algo == BE_LB_ALGO_FAS)
2198 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002199 else if (algo == BE_LB_ALGO_LC)
2200 return "leastconn";
2201 else if (algo == BE_LB_ALGO_SH)
2202 return "source";
2203 else if (algo == BE_LB_ALGO_UH)
2204 return "uri";
2205 else if (algo == BE_LB_ALGO_PH)
2206 return "url_param";
2207 else if (algo == BE_LB_ALGO_HH)
2208 return "hdr";
2209 else if (algo == BE_LB_ALGO_RCH)
2210 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002211 else if (algo == BE_LB_ALGO_NONE)
2212 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002213 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002214 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002215}
2216
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002217/* This function parses a "balance" statement in a backend section describing
2218 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002219 * returns -1, it will write an error message into the <err> buffer which will
2220 * automatically be allocated and must be passed as NULL. The trailing '\n'
2221 * will not be written. The function must be called with <args> pointing to the
2222 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002223 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002224int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002225{
2226 if (!*(args[0])) {
2227 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01002228 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2229 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002230 return 0;
2231 }
2232
2233 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002234 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2235 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002236 }
Willy Tarreau9757a382009-10-03 12:56:50 +02002237 else if (!strcmp(args[0], "static-rr")) {
2238 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2239 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
2240 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01002241 else if (!strcmp(args[0], "first")) {
2242 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2243 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
2244 }
Willy Tarreau51406232008-03-10 22:04:20 +01002245 else if (!strcmp(args[0], "leastconn")) {
2246 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2247 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
2248 }
Willy Tarreau21c741a2019-01-14 18:14:27 +01002249 else if (!strncmp(args[0], "random", 6)) {
Willy Tarreau760e81d2018-05-03 07:20:40 +02002250 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2251 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
Willy Tarreau21c741a2019-01-14 18:14:27 +01002252 curproxy->lbprm.arg_opt1 = 2;
2253
2254 if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
2255 const char *beg;
2256 char *end;
2257
2258 beg = args[0] + 7;
2259 curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
2260
2261 if (*end != ')') {
2262 if (!*end)
2263 memprintf(err, "random : missing closing parenthesis.");
2264 else
2265 memprintf(err, "random : unexpected character '%c' after argument.", *end);
2266 return -1;
2267 }
2268
2269 if (curproxy->lbprm.arg_opt1 < 1) {
2270 memprintf(err, "random : number of draws must be at least 1.");
2271 return -1;
2272 }
2273 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02002274 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002275 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002276 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2277 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002278 }
2279 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002280 int arg = 1;
2281
Willy Tarreau31682232007-11-29 15:38:04 +01002282 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2283 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Willy Tarreaua9a72492019-01-14 16:14:15 +01002284 curproxy->lbprm.arg_opt1 = 0; // "whole"
2285 curproxy->lbprm.arg_opt2 = 0; // "len"
2286 curproxy->lbprm.arg_opt3 = 0; // "depth"
Oskar Stolc8dc41842012-05-19 10:19:54 +01002287
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002288 while (*args[arg]) {
2289 if (!strcmp(args[arg], "len")) {
2290 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002291 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002292 return -1;
2293 }
Willy Tarreaua9a72492019-01-14 16:14:15 +01002294 curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002295 arg += 2;
2296 }
2297 else if (!strcmp(args[arg], "depth")) {
2298 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002299 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002300 return -1;
2301 }
2302 /* hint: we store the position of the ending '/' (depth+1) so
2303 * that we avoid a comparison while computing the hash.
2304 */
Willy Tarreaua9a72492019-01-14 16:14:15 +01002305 curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002306 arg += 2;
2307 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01002308 else if (!strcmp(args[arg], "whole")) {
Willy Tarreaua9a72492019-01-14 16:14:15 +01002309 curproxy->lbprm.arg_opt1 = 1;
Oskar Stolc8dc41842012-05-19 10:19:54 +01002310 arg += 1;
2311 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002312 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01002313 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002314 return -1;
2315 }
2316 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002317 }
Willy Tarreau01732802007-11-01 22:48:15 +01002318 else if (!strcmp(args[0], "url_param")) {
2319 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002320 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01002321 return -1;
2322 }
Willy Tarreau31682232007-11-29 15:38:04 +01002323 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2324 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02002325
Willy Tarreau4c03d1c2019-01-14 15:23:54 +01002326 free(curproxy->lbprm.arg_str);
2327 curproxy->lbprm.arg_str = strdup(args[1]);
2328 curproxy->lbprm.arg_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002329 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002330 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002331 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002332 return -1;
2333 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002334 }
Benoitaffb4812009-03-25 13:02:10 +01002335 }
2336 else if (!strncmp(args[0], "hdr(", 4)) {
2337 const char *beg, *end;
2338
2339 beg = args[0] + 4;
2340 end = strchr(beg, ')');
2341
2342 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002343 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01002344 return -1;
2345 }
2346
2347 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2348 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
2349
Willy Tarreau484ff072019-01-14 15:28:53 +01002350 free(curproxy->lbprm.arg_str);
2351 curproxy->lbprm.arg_len = end - beg;
2352 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
Willy Tarreau9fed8582019-01-14 16:04:54 +01002353 curproxy->lbprm.arg_opt1 = 0;
Benoitaffb4812009-03-25 13:02:10 +01002354
2355 if (*args[1]) {
2356 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002357 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01002358 return -1;
2359 }
Willy Tarreau9fed8582019-01-14 16:04:54 +01002360 curproxy->lbprm.arg_opt1 = 1;
Benoitaffb4812009-03-25 13:02:10 +01002361 }
Emeric Brun736aa232009-06-30 17:56:00 +02002362 }
2363 else if (!strncmp(args[0], "rdp-cookie", 10)) {
2364 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2365 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
2366
2367 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
2368 const char *beg, *end;
2369
2370 beg = args[0] + 11;
2371 end = strchr(beg, ')');
2372
2373 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002374 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002375 return -1;
2376 }
2377
Willy Tarreau484ff072019-01-14 15:28:53 +01002378 free(curproxy->lbprm.arg_str);
2379 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
2380 curproxy->lbprm.arg_len = end - beg;
Emeric Brun736aa232009-06-30 17:56:00 +02002381 }
2382 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
Willy Tarreau484ff072019-01-14 15:28:53 +01002383 free(curproxy->lbprm.arg_str);
2384 curproxy->lbprm.arg_str = strdup("mstshash");
2385 curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
Emeric Brun736aa232009-06-30 17:56:00 +02002386 }
2387 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002388 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002389 return -1;
2390 }
Willy Tarreau01732802007-11-01 22:48:15 +01002391 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002392 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002393 memprintf(err, "only supports 'roundrobin', 'static-rr', 'leastconn', 'source', 'uri', 'url_param', 'hdr(name)' and 'rdp-cookie(name)' options.");
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002394 return -1;
2395 }
2396 return 0;
2397}
2398
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002399
2400/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002401/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002402/************************************************************************/
2403
Willy Tarreau34db1082012-04-19 17:16:54 +02002404/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002405 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002406 * undefined behaviour.
2407 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002408static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002409smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002410{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002411 struct proxy *px;
2412
Willy Tarreau37406352012-04-23 16:16:37 +02002413 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002414 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002415 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002416
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002417 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002418
2419 return 1;
2420}
2421
Willy Tarreau37406352012-04-23 16:16:37 +02002422/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002423 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02002424 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2425 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002426 */
2427static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002428smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002429{
Willy Tarreau24e32d82012-04-23 23:55:44 +02002430 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002431
Willy Tarreau37406352012-04-23 16:16:37 +02002432 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002433 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02002434 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
2435 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002436 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002437 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002438 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002439 return 1;
2440}
2441
Willy Tarreau34db1082012-04-19 17:16:54 +02002442/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002443 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002444 * undefined behaviour.
2445 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002446static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002447smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002448{
2449 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02002450
Willy Tarreau37406352012-04-23 16:16:37 +02002451 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002452 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002453 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002454
Willy Tarreau24e32d82012-04-23 23:55:44 +02002455 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002456 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002457 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002458
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002459 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01002460 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002461 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002462 return 1;
2463 }
2464
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002465 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02002466 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002467 }
2468
2469 return 1;
2470}
2471
Willy Tarreaua5e37562011-12-16 17:06:15 +01002472/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002473static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002474smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002475{
Willy Tarreaube508f12016-03-10 11:47:01 +01002476 if (!smp->strm)
2477 return 0;
2478
Willy Tarreauf853c462012-04-23 18:53:56 +02002479 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002480 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002481 smp->data.u.sint = smp->strm->be->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002482 return 1;
2483}
2484
Marcin Deranekd2471c22016-12-12 14:08:05 +01002485/* set string to the name of the backend */
2486static int
2487smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2488{
2489 if (!smp->strm)
2490 return 0;
2491
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002492 smp->data.u.str.area = (char *)smp->strm->be->id;
2493 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002494 return 0;
2495
2496 smp->data.type = SMP_T_STR;
2497 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002498 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01002499
2500 return 1;
2501}
2502
Willy Tarreaua5e37562011-12-16 17:06:15 +01002503/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002504static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002505smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002506{
Willy Tarreaube508f12016-03-10 11:47:01 +01002507 if (!smp->strm)
2508 return 0;
2509
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002510 if (!objt_server(smp->strm->target))
Willy Tarreau17af4192011-02-23 14:27:06 +01002511 return 0;
2512
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002513 smp->data.type = SMP_T_SINT;
Willy Tarreau1e582e52018-09-20 11:29:28 +02002514 smp->data.u.sint = __objt_server(smp->strm->target)->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002515
2516 return 1;
2517}
2518
vkill1dfd1652019-10-30 16:58:14 +08002519/* set string to the name of the server */
2520static int
2521smp_fetch_srv_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2522{
2523 if (!smp->strm)
2524 return 0;
2525
2526 if (!objt_server(smp->strm->target))
2527 return 0;
2528
2529 smp->data.u.str.area = (char *)__objt_server(smp->strm->target)->id;
2530 if (!smp->data.u.str.area)
2531 return 0;
2532
2533 smp->data.type = SMP_T_STR;
2534 smp->data.u.str.data = strlen(smp->data.u.str.area);
2535
2536 return 1;
2537}
2538
Willy Tarreau34db1082012-04-19 17:16:54 +02002539/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002540 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002541 * undefined behaviour.
2542 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002543static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002544smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002545{
Willy Tarreau37406352012-04-23 16:16:37 +02002546 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002547 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002548 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002549 return 1;
2550}
2551
Willy Tarreau34db1082012-04-19 17:16:54 +02002552/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002553 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002554 * undefined behaviour.
2555 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002556static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002557smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002558{
Willy Tarreau37406352012-04-23 16:16:37 +02002559 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002560 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002561 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02002562 return 1;
2563}
2564
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002565/* set temp integer to the number of available connections across available
2566 * servers on the backend.
2567 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
2568 * undefined behaviour.
2569 */
2570static int
2571smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2572{
2573 struct server *iterator;
2574 struct proxy *px;
2575 unsigned int maxconn;
2576
2577 smp->flags = SMP_F_VOL_TEST;
2578 smp->data.type = SMP_T_SINT;
2579 smp->data.u.sint = 0;
2580
2581 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
2582 if (iterator->cur_state == SRV_ST_STOPPED)
2583 continue;
2584
2585 px = iterator->proxy;
2586 if (!srv_currently_usable(iterator) ||
2587 ((iterator->flags & SRV_F_BACKUP) &&
2588 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
2589 continue;
2590
2591 if (iterator->maxconn == 0) {
2592 /* one active server is unlimited, return -1 */
2593 smp->data.u.sint = -1;
2594 return 1;
2595 }
2596
2597 maxconn = srv_dynamic_maxconn(iterator);
2598 if (maxconn > iterator->cur_sess)
2599 smp->data.u.sint += maxconn - iterator->cur_sess;
2600 }
2601
2602 return 1;
2603}
2604
Willy Tarreau34db1082012-04-19 17:16:54 +02002605/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002606 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002607 * undefined behaviour.
2608 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002609static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002610smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002611{
Willy Tarreau37406352012-04-23 16:16:37 +02002612 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002613 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002614 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02002615 return 1;
2616}
2617
Willy Tarreaua5e37562011-12-16 17:06:15 +01002618/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02002619 * by the number of running servers and rounded up. If there is no running
2620 * server, we return twice the total, just as if we had half a running server.
2621 * This is more or less correct anyway, since we expect the last server to come
2622 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002623 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002624 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02002625 */
2626static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002627smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002628{
2629 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002630 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02002631
Willy Tarreau37406352012-04-23 16:16:37 +02002632 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002633 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002634 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02002635
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002636 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02002637
2638 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002639 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02002640 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002641 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02002642
2643 return 1;
2644}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002645
Willy Tarreau34db1082012-04-19 17:16:54 +02002646/* set temp integer to the number of concurrent connections on the server in the backend.
2647 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2648 * undefined behaviour.
2649 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002650static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002651smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002652{
Willy Tarreauf853c462012-04-23 18:53:56 +02002653 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002654 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002655 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002656 return 1;
2657}
2658
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002659/* set temp integer to the number of available connections on the server in the backend.
2660 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2661 * undefined behaviour.
2662 */
2663static int
2664smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2665{
2666 unsigned int maxconn;
2667
2668 smp->flags = SMP_F_VOL_TEST;
2669 smp->data.type = SMP_T_SINT;
2670
2671 if (args->data.srv->maxconn == 0) {
2672 /* one active server is unlimited, return -1 */
2673 smp->data.u.sint = -1;
2674 return 1;
2675 }
2676
2677 maxconn = srv_dynamic_maxconn(args->data.srv);
2678 if (maxconn > args->data.srv->cur_sess)
2679 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
2680 else
2681 smp->data.u.sint = 0;
2682
2683 return 1;
2684}
2685
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002686/* set temp integer to the number of connections pending in the server's queue.
2687 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2688 * undefined behaviour.
2689 */
2690static int
2691smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
2692{
2693 smp->flags = SMP_F_VOL_TEST;
2694 smp->data.type = SMP_T_SINT;
2695 smp->data.u.sint = args->data.srv->nbpend;
2696 return 1;
2697}
2698
Tait Clarridge7896d522012-12-05 21:39:31 -05002699/* set temp integer to the number of enabled servers on the proxy.
2700 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2701 * undefined behaviour.
2702 */
2703static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002704smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05002705{
2706 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002707 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002708 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05002709 return 1;
2710}
2711
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002712static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
2713{
2714
2715 struct proxy *px;
2716
2717 if (!smp_make_safe(smp))
2718 return 0;
2719
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002720 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002721 if (!px)
2722 return 0;
2723
2724 smp->data.type = SMP_T_SINT;
2725 smp->data.u.sint = be_usable_srv(px);
2726
2727 return 1;
2728}
2729
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002730static int
2731sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
2732{
2733 struct proxy *px;
2734 struct server *srv;
2735 char *bksep;
2736
2737 if (!smp_make_safe(smp))
2738 return 0;
2739
2740 bksep = strchr(smp->data.u.str.area, '/');
2741
2742 if (bksep) {
2743 *bksep = '\0';
2744 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
2745 if (!px)
2746 return 0;
2747 smp->data.u.str.area = bksep + 1;
2748 } else {
2749 if (!(smp->px->cap & PR_CAP_BE))
2750 return 0;
2751 px = smp->px;
2752 }
2753
2754 srv = server_find_by_name(px, smp->data.u.str.area);
2755 if (!srv)
2756 return 0;
2757
2758 smp->data.type = SMP_T_SINT;
2759 smp->data.u.sint = srv->nbpend;
2760 return 1;
2761}
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002762
2763/* Note: must not be declared <const> as its list will be overwritten.
2764 * Please take care of keeping this list alphabetically sorted.
2765 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002766static struct sample_fetch_kw_list smp_kws = {ILH, {
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002767 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2768 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002769 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002770 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
Marcin Deranekd2471c22016-12-12 14:08:05 +01002771 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002772 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2773 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2774 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2775 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2776 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002777 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002778 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002779 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
vkill1dfd1652019-10-30 16:58:14 +08002780 { "srv_name", smp_fetch_srv_name, 0, NULL, SMP_T_STR, SMP_USE_SERVR, },
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002781 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002782 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002783 { /* END */ },
2784}};
2785
Willy Tarreau0108d902018-11-25 19:14:37 +01002786INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
2787
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002788/* Note: must not be declared <const> as its list will be overwritten */
2789static struct sample_conv_kw_list sample_conv_kws = {ILH, {
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002790 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
2791 { "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002792 { /* END */ },
2793}};
2794
Willy Tarreau0108d902018-11-25 19:14:37 +01002795INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002796
Willy Tarreau61612d42012-04-19 18:42:05 +02002797/* Note: must not be declared <const> as its list will be overwritten.
2798 * Please take care of keeping this list alphabetically sorted.
2799 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002800static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002801 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002802}};
2803
Willy Tarreau0108d902018-11-25 19:14:37 +01002804INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002805
Willy Tarreaubaaee002006-06-26 02:48:02 +02002806/*
2807 * Local variables:
2808 * c-indent-level: 8
2809 * c-basic-offset: 8
2810 * End:
2811 */