blob: 0602016dc122dbeb5804aecbcd1742585a0c8a9f [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 Tarreaudcc048a2020-06-04 19:11:43 +020022#include <haproxy/acl.h>
Willy Tarreau4c7e4b72020-05-27 12:58:42 +020023#include <haproxy/api.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020024#include <haproxy/arg.h>
25#include <haproxy/backend.h>
Willy Tarreauf1d32c42020-06-04 21:07:02 +020026#include <haproxy/channel.h>
Willy Tarreau4aa573d2020-06-04 18:21:56 +020027#include <haproxy/check.h>
Willy Tarreau762d7a52020-06-04 11:23:07 +020028#include <haproxy/frontend.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020029#include <haproxy/global.h>
Willy Tarreau8d366972020-05-27 16:10:29 +020030#include <haproxy/hash.h>
Willy Tarreaucd72d8c2020-06-02 19:11:26 +020031#include <haproxy/http.h>
Willy Tarreauc2b1ff02020-06-04 21:21:03 +020032#include <haproxy/http_ana.h>
Willy Tarreau87735332020-06-04 09:08:41 +020033#include <haproxy/http_htx.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020034#include <haproxy/htx.h>
Willy Tarreaufbe8da32020-06-04 14:34:27 +020035#include <haproxy/lb_chash.h>
Willy Tarreaub5fc3bf2020-06-04 14:37:38 +020036#include <haproxy/lb_fas.h>
Willy Tarreau02549412020-06-04 14:41:04 +020037#include <haproxy/lb_fwlc.h>
Willy Tarreau546ba422020-06-04 14:45:03 +020038#include <haproxy/lb_fwrr.h>
Willy Tarreau28671592020-06-04 20:22:59 +020039#include <haproxy/lb_map.h>
Willy Tarreauaeed4a82020-06-04 22:01:04 +020040#include <haproxy/log.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020041#include <haproxy/namespace.h>
Willy Tarreau8efbdfb2020-06-04 11:29:21 +020042#include <haproxy/obj_type.h>
Willy Tarreau469509b2020-06-04 15:13:30 +020043#include <haproxy/payload.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020044#include <haproxy/proto_tcp.h>
45#include <haproxy/protocol.h>
Willy Tarreaua264d962020-06-04 22:29:18 +020046#include <haproxy/proxy.h>
Willy Tarreaua55c4542020-06-04 22:59:39 +020047#include <haproxy/queue.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020048#include <haproxy/sample.h>
Willy Tarreau1e56f922020-06-04 23:20:13 +020049#include <haproxy/server.h>
Willy Tarreau48d25b32020-06-04 18:58:52 +020050#include <haproxy/session.h>
Willy Tarreau209108d2020-06-04 20:30:20 +020051#include <haproxy/ssl_sock.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020052#include <haproxy/stream.h>
Willy Tarreau5e539c92020-06-04 20:45:39 +020053#include <haproxy/stream_interface.h>
Willy Tarreaucea0e1b2020-06-04 17:25:40 +020054#include <haproxy/task.h>
Willy Tarreauc2f7c582020-06-02 18:15:32 +020055#include <haproxy/ticks.h>
Willy Tarreau92b4f132020-06-01 11:05:15 +020056#include <haproxy/time.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020057#include <haproxy/trace.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020058
Christopher Fauleteea8fc72019-11-05 16:18:10 +010059#define TRACE_SOURCE &trace_strm
60
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050061int be_lastsession(const struct proxy *be)
62{
63 if (be->be_counters.last_sess)
64 return now.tv_sec - be->be_counters.last_sess;
65
66 return -1;
67}
68
Bhaskar98634f02013-10-29 23:30:51 -040069/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070070static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040071{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070072 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040073
74 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
75 case BE_LB_HFCN_DJB2:
76 hash = hash_djb2(key, len);
77 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010078 case BE_LB_HFCN_WT6:
79 hash = hash_wt6(key, len);
80 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010081 case BE_LB_HFCN_CRC32:
82 hash = hash_crc32(key, len);
83 break;
Bhaskar98634f02013-10-29 23:30:51 -040084 case BE_LB_HFCN_SDBM:
85 /* this is the default hash function */
86 default:
87 hash = hash_sdbm(key, len);
88 break;
89 }
90
91 return hash;
92}
93
Willy Tarreaubaaee002006-06-26 02:48:02 +020094/*
95 * This function recounts the number of usable active and backup servers for
96 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010097 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +010098 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +010099 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200100 * This functions is designed to be called before server's weight and state
101 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200102 *
103 * threads: this is the caller responsibility to lock data. For now, this
104 * function is called from lb modules, so it should be ok. But if you need to
105 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200106 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200107void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200108{
109 struct server *srv;
110
Willy Tarreau20697042007-11-15 23:26:18 +0100111 px->srv_act = px->srv_bck = 0;
112 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100113 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200114 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200115 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100116 continue;
117
Willy Tarreauc93cd162014-05-13 15:54:22 +0200118 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100119 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100120 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100121 px->lbprm.fbck = srv;
122 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400123 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200124 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100125 } else {
126 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400127 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200128 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200129 }
130 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100131}
Willy Tarreau20697042007-11-15 23:26:18 +0100132
Willy Tarreaub625a082007-11-26 01:15:43 +0100133/* This function simply updates the backend's tot_weight and tot_used values
134 * after servers weights have been updated. It is designed to be used after
135 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200136 *
137 * threads: this is the caller responsibility to lock data. For now, this
138 * function is called from lb modules, so it should be ok. But if you need to
139 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100140 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200141void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100142{
Willy Tarreau20697042007-11-15 23:26:18 +0100143 if (px->srv_act) {
144 px->lbprm.tot_weight = px->lbprm.tot_wact;
145 px->lbprm.tot_used = px->srv_act;
146 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100147 else if (px->lbprm.fbck) {
148 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200149 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100150 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100151 }
152 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100153 px->lbprm.tot_weight = px->lbprm.tot_wbck;
154 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100155 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100156}
157
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200158/*
159 * This function tries to find a running server for the proxy <px> following
160 * the source hash method. Depending on the number of active/backup servers,
161 * it will either look for active servers, or for backup servers.
162 * If any server is found, it will be returned. If no valid server is found,
163 * NULL is returned.
164 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100165static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200166{
167 unsigned int h, l;
168
169 if (px->lbprm.tot_weight == 0)
170 return NULL;
171
172 l = h = 0;
173
174 /* note: we won't hash if there's only one server left */
175 if (px->lbprm.tot_used == 1)
176 goto hash_done;
177
178 while ((l + sizeof (int)) <= len) {
179 h ^= ntohl(*(unsigned int *)(&addr[l]));
180 l += sizeof (int);
181 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500182 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100183 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200184 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100185 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100186 return chash_get_server_hash(px, h, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200187 else
188 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200189}
190
191/*
192 * This function tries to find a running server for the proxy <px> following
193 * the URI hash method. In order to optimize cache hits, the hash computation
194 * ends at the question mark. Depending on the number of active/backup servers,
195 * it will either look for active servers, or for backup servers.
196 * If any server is found, it will be returned. If no valid server is found,
Willy Tarreaua9a72492019-01-14 16:14:15 +0100197 * NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
Willy Tarreau3d1119d2020-09-23 08:05:47 +0200198 * the "whole" optional argument (boolean, bit0), the "len" argument (numeric)
199 * and the "depth" argument (numeric).
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200200 *
201 * This code was contributed by Guillaume Dallaire, who also selected this hash
202 * algorithm out of a tens because it gave him the best results.
203 *
204 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100205static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200206{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700207 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200208 int c;
209 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400210 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200211
212 if (px->lbprm.tot_weight == 0)
213 return NULL;
214
215 /* note: we won't hash if there's only one server left */
216 if (px->lbprm.tot_used == 1)
217 goto hash_done;
218
Willy Tarreaua9a72492019-01-14 16:14:15 +0100219 if (px->lbprm.arg_opt2) // "len"
220 uri_len = MIN(uri_len, px->lbprm.arg_opt2);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200221
Bhaskar98634f02013-10-29 23:30:51 -0400222 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200223 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200224 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200225 if (c == '/') {
226 slashes++;
Willy Tarreaua9a72492019-01-14 16:14:15 +0100227 if (slashes == px->lbprm.arg_opt3) /* depth+1 */
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200228 break;
229 }
Willy Tarreau3d1119d2020-09-23 08:05:47 +0200230 else if (c == '?' && !(px->lbprm.arg_opt1 & 1)) // "whole"
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200231 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200232 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200233 }
Bhaskar98634f02013-10-29 23:30:51 -0400234
235 hash = gen_hash(px, start, (end - start));
236
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500237 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100238 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200239 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100240 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100241 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200242 else
243 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200244}
245
Christopher Faulet5b517552017-06-09 14:17:53 +0200246/*
Willy Tarreau01732802007-11-01 22:48:15 +0100247 * This function tries to find a running server for the proxy <px> following
248 * the URL parameter hash method. It looks for a specific parameter in the
249 * URL and hashes it to compute the server ID. This is useful to optimize
250 * performance by avoiding bounces between servers in contexts where sessions
251 * are shared but cookies are not usable. If the parameter is not found, NULL
252 * is returned. If any server is found, it will be returned. If no valid server
253 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100254 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100255static 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 +0100256{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700257 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400258 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200259 const char *p;
260 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100261 int plen;
262
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200263 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100264 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100265 return NULL;
266
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200267 if ((p = memchr(uri, '?', uri_len)) == NULL)
268 return NULL;
269
Willy Tarreau01732802007-11-01 22:48:15 +0100270 p++;
271
272 uri_len -= (p - uri);
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100273 plen = px->lbprm.arg_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200274 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100275
276 while (uri_len > plen) {
277 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200278 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100279 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200280 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100281 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200282 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100283 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200284 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400285 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200286 uri_len -= plen + 1;
287
Bhaskar98634f02013-10-29 23:30:51 -0400288 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100289 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400290 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100291 }
Bhaskar98634f02013-10-29 23:30:51 -0400292 hash = gen_hash(px, start, (end - start));
293
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500294 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100295 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400296
Willy Tarreau6c30be52019-01-14 17:07:39 +0100297 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100298 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200299 else
300 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100301 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200302 }
303 /* skip to next parameter */
304 p = memchr(params, '&', uri_len);
305 if (!p)
306 return NULL;
307 p++;
308 uri_len -= (p - params);
309 params = p;
310 }
311 return NULL;
312}
313
314/*
315 * this does the same as the previous server_ph, but check the body contents
316 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100317static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200318{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700319 unsigned int hash = 0;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100320 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200321 struct proxy *px = s->be;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200322 struct htx *htx = htxbuf(&req->buf);
323 struct htx_blk *blk;
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100324 unsigned int plen = px->lbprm.arg_len;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100325 unsigned long len;
326 const char *params, *p, *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200327
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100328 if (px->lbprm.tot_weight == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200329 return NULL;
330
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200331 p = params = NULL;
332 len = 0;
333 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
334 enum htx_blk_type type = htx_get_blk_type(blk);
335 struct ist v;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200336
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200337 if (type != HTX_BLK_DATA)
338 continue;
339 v = htx_get_blk_value(htx, blk);
340 p = params = v.ptr;
341 len = v.len;
342 break;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100343 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200344
345 while (len > plen) {
346 /* Look for the parameter name followed by an equal symbol */
347 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100348 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200349 /* OK, we have the parameter here at <params>, and
350 * the value after the equal sign, at <p>
351 * skip the equal symbol
352 */
353 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400354 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200355 len -= plen + 1;
356
Bhaskar98634f02013-10-29 23:30:51 -0400357 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200358 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100359 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400360 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100361 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200362 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
363 break;
364 return NULL; /* oh, no; this is not uri-encoded.
365 * This body does not contain parameters.
366 */
367 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200368 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400369 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200370 /* should we break if vlen exceeds limit? */
371 }
Bhaskar98634f02013-10-29 23:30:51 -0400372 hash = gen_hash(px, start, (end - start));
373
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500374 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100375 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400376
Willy Tarreau6c30be52019-01-14 17:07:39 +0100377 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100378 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200379 else
380 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200381 }
382 }
Willy Tarreau01732802007-11-01 22:48:15 +0100383 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200384 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100385 if (!p)
386 return NULL;
387 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200388 len -= (p - params);
389 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100390 }
391 return NULL;
392}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200393
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200394
Willy Tarreaubaaee002006-06-26 02:48:02 +0200395/*
Benoitaffb4812009-03-25 13:02:10 +0100396 * This function tries to find a running server for the proxy <px> following
397 * the Header parameter hash method. It looks for a specific parameter in the
398 * URL and hashes it to compute the server ID. This is useful to optimize
399 * performance by avoiding bounces between servers in contexts where sessions
400 * are shared but cookies are not usable. If the parameter is not found, NULL
401 * is returned. If any server is found, it will be returned. If no valid server
Willy Tarreau9fed8582019-01-14 16:04:54 +0100402 * is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
403 * apply to the middle part of a domain name ("use_domain_only" option).
Benoitaffb4812009-03-25 13:02:10 +0100404 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100405static struct server *get_server_hh(struct stream *s, const struct server *avoid)
Benoitaffb4812009-03-25 13:02:10 +0100406{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700407 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100408 struct proxy *px = s->be;
Willy Tarreau484ff072019-01-14 15:28:53 +0100409 unsigned int plen = px->lbprm.arg_len;
Benoitaffb4812009-03-25 13:02:10 +0100410 unsigned long len;
Benoitaffb4812009-03-25 13:02:10 +0100411 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400412 const char *start, *end;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200413 struct htx *htx = htxbuf(&s->req.buf);
414 struct http_hdr_ctx ctx = { .blk = NULL };
Benoitaffb4812009-03-25 13:02:10 +0100415
416 /* tot_weight appears to mean srv_count */
417 if (px->lbprm.tot_weight == 0)
418 return NULL;
419
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200420 /* note: we won't hash if there's only one server left */
421 if (px->lbprm.tot_used == 1)
422 goto hash_done;
423
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200424 http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100425
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200426 /* if the header is not found or empty, let's fallback to round robin */
427 if (!ctx.blk || !ctx.value.len)
428 return NULL;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100429
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200430 /* Found a the param_name in the headers.
431 * we will compute the hash based on this value ctx.val.
432 */
433 len = ctx.value.len;
434 p = ctx.value.ptr;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100435
Willy Tarreau9fed8582019-01-14 16:04:54 +0100436 if (!px->lbprm.arg_opt1) {
Bhaskar98634f02013-10-29 23:30:51 -0400437 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100438 } else {
439 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100440 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100441 /* special computation, use only main domain name, not tld/host
442 * going back from the end of string, start hashing at first
443 * dot stop at next.
444 * This is designed to work with the 'Host' header, and requires
445 * a special option to activate this.
446 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100447 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100448 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100449 if (dohash) {
450 /* Rewind the pointer until the previous char
451 * is a dot, this will allow to set the start
452 * position of the domain. */
453 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100454 break;
Benoitaffb4812009-03-25 13:02:10 +0100455 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100456 else if (*p == '.') {
457 /* The pointer is rewinded to the dot before the
458 * tld, we memorize the end of the domain and
459 * can enter the domain processing. */
460 end = p;
461 dohash = 1;
462 }
Benoitaffb4812009-03-25 13:02:10 +0100463 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100464 len--;
Benoitaffb4812009-03-25 13:02:10 +0100465 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100466 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400467 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100468 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500469 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100470 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200471 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100472 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100473 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200474 else
475 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100476}
477
Willy Tarreau34db1082012-04-19 17:16:54 +0200478/* RDP Cookie HASH. */
Willy Tarreau59884a62019-01-02 14:48:31 +0100479static struct server *get_server_rch(struct stream *s, const struct server *avoid)
Emeric Brun736aa232009-06-30 17:56:00 +0200480{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700481 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200482 struct proxy *px = s->be;
483 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200484 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200485 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200486 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200487
488 /* tot_weight appears to mean srv_count */
489 if (px->lbprm.tot_weight == 0)
490 return NULL;
491
Willy Tarreau37406352012-04-23 16:16:37 +0200492 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200493
Willy Tarreau6a445eb2018-06-19 07:04:45 +0200494 rewind = co_data(&s->req);
495 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200496
Willy Tarreau484ff072019-01-14 15:28:53 +0100497 ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200498 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100499
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200500 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200501
Willy Tarreau37406352012-04-23 16:16:37 +0200502 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200503 return NULL;
504
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200505 /* note: we won't hash if there's only one server left */
506 if (px->lbprm.tot_used == 1)
507 goto hash_done;
508
Willy Tarreau484ff072019-01-14 15:28:53 +0100509 /* Found the param_name in the headers.
Emeric Brun736aa232009-06-30 17:56:00 +0200510 * we will compute the hash based on this value ctx.val.
511 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200512 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400513
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500514 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100515 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200516 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100517 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100518 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200519 else
520 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200521}
Christopher Faulet5b517552017-06-09 14:17:53 +0200522
Willy Tarreau760e81d2018-05-03 07:20:40 +0200523/* random value */
Willy Tarreau59884a62019-01-02 14:48:31 +0100524static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
Willy Tarreau760e81d2018-05-03 07:20:40 +0200525{
526 unsigned int hash = 0;
527 struct proxy *px = s->be;
Willy Tarreau21c741a2019-01-14 18:14:27 +0100528 struct server *prev, *curr;
529 int draws = px->lbprm.arg_opt1; // number of draws
Willy Tarreau760e81d2018-05-03 07:20:40 +0200530
531 /* tot_weight appears to mean srv_count */
532 if (px->lbprm.tot_weight == 0)
533 return NULL;
534
Willy Tarreau21c741a2019-01-14 18:14:27 +0100535 curr = NULL;
536 do {
537 prev = curr;
Willy Tarreaub9f54c52020-03-08 17:31:39 +0100538 hash = ha_random32();
Willy Tarreau21c741a2019-01-14 18:14:27 +0100539 curr = chash_get_server_hash(px, hash, avoid);
540 if (!curr)
541 break;
542
543 /* compare the new server to the previous best choice and pick
544 * the one with the least currently served requests.
545 */
546 if (prev && prev != curr &&
547 curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
548 curr = prev;
549 } while (--draws > 0);
550
Willy Tarreaub88ae182020-09-29 16:58:30 +0200551 /* if the selected server is full, pretend we have none so that we reach
552 * the backend's queue instead.
553 */
554 if (curr &&
555 (curr->nbpend || (curr->maxconn && curr->served >= srv_dynamic_maxconn(curr))))
556 curr = NULL;
557
Willy Tarreau21c741a2019-01-14 18:14:27 +0100558 return curr;
Willy Tarreau760e81d2018-05-03 07:20:40 +0200559}
560
Benoitaffb4812009-03-25 13:02:10 +0100561/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200562 * This function applies the load-balancing algorithm to the stream, as
563 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200564 * 'assigned'.
565 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200566 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200567 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100568 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200569 * The function tries to keep the original connection slot if it reconnects to
570 * the same server, otherwise it releases it and tries to offer it.
571 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200572 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200573 *
574 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100575 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200576 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
577 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200578 * SRV_STATUS_INTERNAL for other unrecoverable errors.
579 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200580 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100581 * it does not need to be called anymore. This means that target_srv(&s->target)
582 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200583 *
584 */
585
Willy Tarreau87b09662015-04-03 00:22:06 +0200586int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200587{
Olivier Houchardba4fff52018-12-01 14:40:40 +0100588 struct connection *conn = NULL;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200589 struct server *conn_slot;
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100590 struct server *srv = NULL, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200591 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100592
Simon Horman8effd3d2011-08-13 08:03:52 +0900593 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200594
Willy Tarreau7c669d72008-06-20 15:04:11 +0200595 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200596 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200597 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100598
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100599 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200600 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200601
Willy Tarreau7c669d72008-06-20 15:04:11 +0200602 /* We have to release any connection slot before applying any LB algo,
603 * otherwise we may erroneously end up with no available slot.
604 */
605 if (conn_slot)
606 sess_change_server(s, NULL);
607
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100608 /* We will now try to find the good server and store it into <objt_server(s->target)>.
609 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200610 * as well as if no server is available (check error code).
611 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100612
Willy Tarreau827aee92011-03-10 16:55:02 +0100613 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100614 s->target = NULL;
Willy Tarreau664beb82011-03-10 11:38:29 +0100615
Olivier Houchardba4fff52018-12-01 14:40:40 +0100616 if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200617 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100618 (s->be->options & PR_O_PREF_LAST))) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100619 struct sess_srv_list *srv_list;
620 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
621 struct server *tmpsrv = objt_server(srv_list->target);
Olivier Houchardba4fff52018-12-01 14:40:40 +0100622
623 if (tmpsrv && tmpsrv->proxy == s->be &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200624 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100625 (!s->be->max_ka_queue ||
626 server_has_room(tmpsrv) || (
627 tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
628 srv_currently_usable(tmpsrv)) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100629 list_for_each_entry(conn, &srv_list->conn_list, session_list) {
Willy Tarreau911db9b2020-01-23 16:27:54 +0100630 if (!(conn->flags & CO_FL_WAIT_XPRT)) {
Olivier Houchardba4fff52018-12-01 14:40:40 +0100631 srv = tmpsrv;
632 s->target = &srv->obj_type;
Christopher Faulete91a5262020-07-01 18:56:30 +0200633 if (conn->flags & CO_FL_SESS_IDLE) {
634 conn->flags &= ~CO_FL_SESS_IDLE;
635 s->sess->idle_conns--;
636 }
Olivier Houchardba4fff52018-12-01 14:40:40 +0100637 goto out_ok;
638 }
639 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100640 }
641 }
Willy Tarreau9420b122013-12-15 18:58:25 +0100642 }
Christopher Faulet5b517552017-06-09 14:17:53 +0200643
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200644 if (s->be->lbprm.algo & BE_LB_KIND) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200645 /* we must check if we have at least one server available */
646 if (!s->be->lbprm.tot_weight) {
647 err = SRV_STATUS_NOSRV;
648 goto out;
649 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200650
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200651 /* if there's some queue on the backend, with certain algos we
652 * know it's because all servers are full.
653 */
654 if (s->be->nbpend &&
Willy Tarreau8ae8c482020-10-22 17:19:07 +0200655 (((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_FAS)|| // first
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200656 ((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_RR) || // roundrobin
657 ((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_SRR))) { // static-rr
658 err = SRV_STATUS_FULL;
659 goto out;
660 }
661
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200662 /* First check whether we need to fetch some data or simply call
663 * the LB lookup function. Only the hashing functions will need
664 * some input data in fact, and will support multiple algorithms.
665 */
666 switch (s->be->lbprm.algo & BE_LB_LKUP) {
667 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100668 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200669 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200670
Willy Tarreauf09c6602012-02-13 17:12:08 +0100671 case BE_LB_LKUP_FSTREE:
672 srv = fas_get_next_server(s->be, prev_srv);
673 break;
674
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200675 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100676 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200677 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200678
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200679 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200680 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200681 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200682 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
Willy Tarreau59884a62019-01-02 14:48:31 +0100683 srv = get_server_rnd(s, prev_srv);
Willy Tarreau6c30be52019-01-14 17:07:39 +0100684 else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100685 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200686 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100687 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200688 break;
689 }
690 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200691 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200692 err = SRV_STATUS_INTERNAL;
693 goto out;
694 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200695
696 switch (s->be->lbprm.algo & BE_LB_PARM) {
697 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200698 conn = objt_conn(strm_orig(s));
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200699 if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200700 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200701 (void *)&((struct sockaddr_in *)conn->src)->sin_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100702 4, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200703 }
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200704 else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200705 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200706 (void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100707 16, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200708 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200709 else {
710 /* unknown IP family */
711 err = SRV_STATUS_INTERNAL;
712 goto out;
713 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200714 break;
715
716 case BE_LB_HASH_URI:
717 /* URI hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200718 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100719 struct ist uri;
720
Christopher Faulet297fbb42019-05-13 14:41:27 +0200721 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Willy Tarreau57a37412020-09-23 08:56:29 +0200722 if (s->be->lbprm.arg_opt1 & 2) {
723 uri = http_get_path(uri);
724 if (!uri.ptr)
725 uri = ist("");
726 }
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100727 srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
728 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200729 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200730
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200731 case BE_LB_HASH_PRM:
732 /* URL Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200733 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100734 struct ist uri;
735
Christopher Faulet297fbb42019-05-13 14:41:27 +0200736 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100737 srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100738
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200739 if (!srv && s->txn->meth == HTTP_METH_POST)
740 srv = get_server_ph_post(s, prev_srv);
741 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200742 break;
Benoitaffb4812009-03-25 13:02:10 +0100743
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200744 case BE_LB_HASH_HDR:
745 /* Header Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200746 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
747 srv = get_server_hh(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200748 break;
749
750 case BE_LB_HASH_RDP:
751 /* RDP Cookie hashing */
Willy Tarreau59884a62019-01-02 14:48:31 +0100752 srv = get_server_rch(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200753 break;
754
755 default:
756 /* unknown balancing algorithm */
757 err = SRV_STATUS_INTERNAL;
758 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100759 }
Emeric Brun736aa232009-06-30 17:56:00 +0200760
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200761 /* If the hashing parameter was not found, let's fall
762 * back to round robin on the map.
763 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100764 if (!srv) {
Willy Tarreau6c30be52019-01-14 17:07:39 +0100765 if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100766 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200767 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100768 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200769 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200770
771 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200772 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200773
Willy Tarreau7c669d72008-06-20 15:04:11 +0200774 default:
775 /* unknown balancing algorithm */
776 err = SRV_STATUS_INTERNAL;
777 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200778 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200779
Willy Tarreau827aee92011-03-10 16:55:02 +0100780 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200781 err = SRV_STATUS_FULL;
782 goto out;
783 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100784 else if (srv != prev_srv) {
Olivier Houchard237f7812019-03-08 18:49:07 +0100785 _HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
786 _HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100787 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100788 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200789 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200790 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100791 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200792 }
Olivier Houchard2442f682018-12-01 17:03:38 +0100793 else if ((s->be->options & PR_O_HTTP_PROXY)) {
794 conn = cs_conn(objt_cs(s->si[1].end));
795
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200796 if (conn && conn->dst && is_addr(conn->dst)) {
Olivier Houchard2442f682018-12-01 17:03:38 +0100797 /* in proxy mode, we need a valid destination address */
798 s->target = &s->be->obj_type;
799 } else {
800 err = SRV_STATUS_NOSRV;
801 goto out;
802 }
Willy Tarreau664beb82011-03-10 11:38:29 +0100803 }
804 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200805 err = SRV_STATUS_NOSRV;
806 goto out;
807 }
808
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100809out_ok:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200810 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200811 err = SRV_STATUS_OK;
812 out:
813
814 /* Either we take back our connection slot, or we offer it to someone
815 * else if we don't need it anymore.
816 */
817 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100818 if (conn_slot == srv) {
819 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200820 } else {
821 if (may_dequeue_tasks(conn_slot, s->be))
822 process_srv_queue(conn_slot);
823 }
824 }
825
826 out_err:
827 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200828}
829
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100830/* Allocate an address for the destination endpoint
Willy Tarreaubaaee002006-06-26 02:48:02 +0200831 * The address is taken from the currently assigned server, or from the
832 * dispatch or transparent address.
833 *
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100834 * Returns SRV_STATUS_OK on success.
Amaury Denoyellef7bdf002021-01-21 09:40:19 +0100835 * On error, no address is allocated and SRV_STATUS_INTERNAL is returned.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200836 */
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100837static int alloc_dst_address(struct sockaddr_storage **ss,
838 struct server *srv, struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200839{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200840 struct connection *cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200841
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100842 *ss = NULL;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200843
Willy Tarreaue7dff022015-04-03 01:14:29 +0200844 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200845 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200846 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200847 return SRV_STATUS_INTERNAL;
848
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100849 if (!sockaddr_alloc(ss, NULL, 0))
850 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200851
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100852 **ss = srv->addr;
853 set_host_port(*ss, srv->svc_port);
854
855 if (!is_addr(*ss) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200856 /* if the server has no address, we use the same address
857 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200858 * locally on multiple addresses at once. Nothing is done
859 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200860 */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200861 if (!conn_get_dst(cli_conn)) {
862 /* do nothing if we can't retrieve the address */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200863 } else if (cli_conn->dst->ss_family == AF_INET) {
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100864 ((struct sockaddr_in *)*ss)->sin_addr =
865 ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200866 } else if (cli_conn->dst->ss_family == AF_INET6) {
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100867 ((struct sockaddr_in6 *)*ss)->sin6_addr =
868 ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200869 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200870 }
871
Willy Tarreaubaaee002006-06-26 02:48:02 +0200872 /* if this server remaps proxied ports, we'll use
873 * the port the client connected to with an offset. */
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100874 if ((srv->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100875 int base_port;
876
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200877 if (conn_get_dst(cli_conn)) {
878 /* First, retrieve the port from the incoming connection */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200879 base_port = get_host_port(cli_conn->dst);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100880
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200881 /* Second, assign the outgoing connection's port */
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100882 base_port += get_host_port(*ss);
883 set_host_port(*ss, base_port);
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200884 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200885 }
886 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200887 else if (s->be->options & PR_O_DISPATCH) {
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100888 if (!sockaddr_alloc(ss, NULL, 0))
889 return SRV_STATUS_INTERNAL;
890
Willy Tarreaubaaee002006-06-26 02:48:02 +0200891 /* connect to the defined dispatch addr */
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100892 **ss = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200893 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200894 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100895 if (!sockaddr_alloc(ss, NULL, 0))
896 return SRV_STATUS_INTERNAL;
897
Willy Tarreaubaaee002006-06-26 02:48:02 +0200898 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200899 if (conn_get_dst(cli_conn) &&
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200900 (cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
Amaury Denoyelle68cf3952021-01-11 15:24:31 +0100901 **ss = *cli_conn->dst;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200902 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100903 else if (s->be->options & PR_O_HTTP_PROXY) {
904 /* If HTTP PROXY option is set, then server is already assigned
905 * during incoming client request parsing. */
906 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100907 else {
908 /* no server and no LB algorithm ! */
909 return SRV_STATUS_INTERNAL;
910 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200911
Willy Tarreaubaaee002006-06-26 02:48:02 +0200912 return SRV_STATUS_OK;
913}
914
Willy Tarreau87b09662015-04-03 00:22:06 +0200915/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200916 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200917 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200918 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200919 * be called before any connection and after any retry or redispatch occurs.
920 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200921 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200922 *
923 * Returns :
924 *
925 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100926 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200927 * SRV_STATUS_QUEUED if the connection has been queued.
928 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100929 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200930 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200931 * SRV_STATUS_INTERNAL for other unrecoverable errors.
932 *
933 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200934int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200935{
936 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100937 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200938 int err;
939
940 if (s->pend_pos)
941 return SRV_STATUS_INTERNAL;
942
Willy Tarreau7c669d72008-06-20 15:04:11 +0200943 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200944 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100945 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100946
Willy Tarreau7c669d72008-06-20 15:04:11 +0200947 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100948 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200949 /* This stream was previously assigned to a server. We have to
950 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200951 * - if the server changed :
952 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200953 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200954 * - increment srv->redispatches and be->redispatches
955 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100956 */
957
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100958 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200959 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
960 s->txn->flags &= ~TX_CK_MASK;
961 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200962 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200963 s->flags |= SF_REDISP;
Olivier Houchard237f7812019-03-08 18:49:07 +0100964 _HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
965 _HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200966 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +0100967 _HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
968 _HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100969 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100970 }
971 }
972
Willy Tarreaubaaee002006-06-26 02:48:02 +0200973 switch (err) {
974 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200975 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100976 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100977 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200978 return SRV_STATUS_OK; /* dispatch or proxy mode */
979
980 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100981 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200982 return SRV_STATUS_OK;
983
Willy Tarreau87b09662015-04-03 00:22:06 +0200984 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200985 * connection slot yet. Either it is a redispatch, or it was
986 * assigned from persistence information (direct mode).
987 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200988 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200989 /* server scheduled for redirection, and already assigned. We
990 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100991 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100992 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100993 return SRV_STATUS_OK;
994 }
995
Willy Tarreau87b09662015-04-03 00:22:06 +0200996 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200997 * We know we have to queue it into the server's queue, so if a maxqueue
998 * is set on the server, we must also check that the server's queue is
999 * not full, in which case we have to return FULL.
1000 */
Willy Tarreau827aee92011-03-10 16:55:02 +01001001 if (srv->maxconn &&
1002 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +02001003
Willy Tarreau827aee92011-03-10 16:55:02 +01001004 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +02001005 return SRV_STATUS_FULL;
1006
Willy Tarreaubaaee002006-06-26 02:48:02 +02001007 p = pendconn_add(s);
1008 if (p)
1009 return SRV_STATUS_QUEUED;
1010 else
Willy Tarreau7c669d72008-06-20 15:04:11 +02001011 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001012 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001013
1014 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +01001015 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001016 return SRV_STATUS_OK;
1017
1018 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +02001019 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001020 p = pendconn_add(s);
1021 if (p)
1022 return SRV_STATUS_QUEUED;
1023 else
Willy Tarreau7c669d72008-06-20 15:04:11 +02001024 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001025
1026 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +02001027 return err;
1028
Willy Tarreaubaaee002006-06-26 02:48:02 +02001029 case SRV_STATUS_INTERNAL:
1030 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001031
Willy Tarreaubaaee002006-06-26 02:48:02 +02001032 default:
1033 return SRV_STATUS_INTERNAL;
1034 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +01001035}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001036
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001037/* Allocate an address for source binding on the specified server or backend.
1038 * The allocation is only performed if the connection is intended to be used
1039 * with transparent mode.
1040 *
1041 * Returns SRV_STATUS_OK if no transparent mode or the address was successfully
1042 * allocated. Otherwise returns SRV_STATUS_INTERNAL.
Willy Tarreaub1d67742010-03-29 19:36:59 +02001043 */
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001044static int alloc_bind_address(struct sockaddr_storage **ss,
1045 struct server *srv, struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +02001046{
Willy Tarreau29fbe512015-08-20 19:35:14 +02001047#if defined(CONFIG_HAP_TRANSPARENT)
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001048 struct conn_src *src = NULL;
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001049 struct connection *cli_conn;
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001050 struct sockaddr_in *sin;
1051 char *vptr;
1052 size_t vlen;
1053#endif
Olivier Houchard09a0f032019-01-17 15:59:13 +01001054
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001055 *ss = NULL;
Willy Tarreau827aee92011-03-10 16:55:02 +01001056
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001057#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001058 if (srv && srv->conn_src.opts & CO_SRC_BIND)
1059 src = &srv->conn_src;
1060 else if (s->be->conn_src.opts & CO_SRC_BIND)
1061 src = &s->be->conn_src;
Willy Tarreau294c4732011-12-16 21:35:50 +01001062
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001063 /* no transparent mode, no need to allocate an address, returns OK */
1064 if (!src)
1065 return SRV_STATUS_OK;
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001066
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001067 switch (src->opts & CO_SRC_TPROXY_MASK) {
1068 case CO_SRC_TPROXY_ADDR:
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001069 if (!sockaddr_alloc(ss, NULL, 0))
1070 return SRV_STATUS_INTERNAL;
1071
1072 **ss = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001073 break;
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001074
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001075 case CO_SRC_TPROXY_CLI:
1076 case CO_SRC_TPROXY_CIP:
1077 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001078 cli_conn = objt_conn(strm_orig(s));
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001079 if (!cli_conn || !conn_get_src(cli_conn))
1080 return SRV_STATUS_INTERNAL;
1081
1082 if (!sockaddr_alloc(ss, NULL, 0))
1083 return SRV_STATUS_INTERNAL;
1084
1085 **ss = *cli_conn->src;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001086 break;
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001087
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001088 case CO_SRC_TPROXY_DYN:
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001089 if (!src->bind_hdr_occ || !IS_HTX_STRM(s))
1090 return SRV_STATUS_INTERNAL;
Willy Tarreau294c4732011-12-16 21:35:50 +01001091
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001092 if (!sockaddr_alloc(ss, NULL, 0))
1093 return SRV_STATUS_INTERNAL;
1094
1095 /* bind to the IP in a header */
1096 sin = (struct sockaddr_in *)*ss;
1097 sin->sin_family = AF_INET;
1098 sin->sin_port = 0;
1099 sin->sin_addr.s_addr = 0;
1100 if (!http_get_htx_hdr(htxbuf(&s->req.buf),
1101 ist2(src->bind_hdr_name, src->bind_hdr_len),
1102 src->bind_hdr_occ, NULL, &vptr, &vlen)) {
1103 sockaddr_free(ss);
1104 return SRV_STATUS_INTERNAL;
Willy Tarreaub1d67742010-03-29 19:36:59 +02001105 }
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001106
1107 sin->sin_addr.s_addr = htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001108 break;
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001109
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001110 default:
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001111 ;
Willy Tarreaub1d67742010-03-29 19:36:59 +02001112 }
1113#endif
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001114
1115 return SRV_STATUS_OK;
Willy Tarreaub1d67742010-03-29 19:36:59 +02001116}
1117
Olivier Houchard566df302020-03-06 18:18:56 +01001118/* Attempt to get a backend connection from the specified mt_list array
Willy Tarreau0d587112020-07-01 15:04:38 +02001119 * (safe or idle connections). The <is_safe> argument means what type of
1120 * connection the caller wants.
Olivier Houchard566df302020-03-06 18:18:56 +01001121 */
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001122static struct connection *conn_backend_get(struct stream *s, struct server *srv, int is_safe, int64_t hash)
Olivier Houchard566df302020-03-06 18:18:56 +01001123{
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001124 struct eb_root *tree = is_safe ? srv->safe_conns_tree : srv->idle_conns_tree;
1125 struct connection *conn = NULL;
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001126 int i; // thread number
Olivier Houchard566df302020-03-06 18:18:56 +01001127 int found = 0;
Willy Tarreau364f25a2020-07-01 15:55:30 +02001128 int stop;
Olivier Houchard566df302020-03-06 18:18:56 +01001129
1130 /* We need to lock even if this is our own list, because another
1131 * thread may be trying to migrate that connection, and we don't want
1132 * to end up with two threads using the same connection.
1133 */
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001134 i = tid;
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001135 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001136 conn = srv_lookup_conn(&tree[tid], hash);
1137 if (conn)
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001138 conn_delete_from_tree(&conn->hash_node->node);
Willy Tarreau0d587112020-07-01 15:04:38 +02001139
1140 /* If we failed to pick a connection from the idle list, let's try again with
1141 * the safe list.
1142 */
1143 if (!conn && !is_safe && srv->curr_safe_nb > 0) {
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001144 conn = srv_lookup_conn(&srv->safe_conns_tree[tid], hash);
Willy Tarreau0d587112020-07-01 15:04:38 +02001145 if (conn) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001146 conn_delete_from_tree(&conn->hash_node->node);
Willy Tarreau0d587112020-07-01 15:04:38 +02001147 is_safe = 1;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001148 tree = srv->safe_conns_tree;
Willy Tarreau0d587112020-07-01 15:04:38 +02001149 }
1150 }
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001151 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Olivier Houchard566df302020-03-06 18:18:56 +01001152
1153 /* If we found a connection in our own list, and we don't have to
1154 * steal one from another thread, then we're done.
1155 */
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001156 if (conn)
1157 goto done;
1158
Willy Tarreau76cc6992020-07-01 18:49:24 +02001159 /* pool sharing globally disabled ? */
1160 if (!(global.tune.options & GTUNE_IDLE_POOL_SHARED))
1161 goto done;
1162
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001163 /* Are we allowed to pick from another thread ? We'll still try
1164 * it if we're running low on FDs as we don't want to create
1165 * extra conns in this case, otherwise we can give up if we have
1166 * too few idle conns.
1167 */
1168 if (srv->curr_idle_conns < srv->low_idle_conns &&
1169 ha_used_fds < global.tune.pool_low_count)
1170 goto done;
Olivier Houchard566df302020-03-06 18:18:56 +01001171
Willy Tarreau364f25a2020-07-01 15:55:30 +02001172 /* Lookup all other threads for an idle connection, starting from last
1173 * unvisited thread.
1174 */
1175 stop = srv->next_takeover;
1176 if (stop >= global.nbthread)
1177 stop = 0;
1178
Amaury Denoyelle5f1ded52020-10-14 18:17:03 +02001179 i = stop;
1180 do {
Willy Tarreau364f25a2020-07-01 15:55:30 +02001181 if (!srv->curr_idle_thr[i] || i == tid)
Willy Tarreau151c2532020-07-01 08:24:44 +02001182 continue;
1183
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001184 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[i].idle_conns_lock);
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001185 conn = srv_lookup_conn(&tree[i], hash);
1186 while (conn) {
Olivier Houchard1662cdb2020-07-03 14:04:37 +02001187 if (conn->mux->takeover && conn->mux->takeover(conn, i) == 0) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001188 conn_delete_from_tree(&conn->hash_node->node);
Willy Tarreaub1591322020-06-29 14:17:59 +02001189 _HA_ATOMIC_ADD(&activity[tid].fd_takeover, 1);
Olivier Houchard566df302020-03-06 18:18:56 +01001190 found = 1;
1191 break;
1192 }
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001193
1194 conn = srv_lookup_conn_next(conn);
Olivier Houchard566df302020-03-06 18:18:56 +01001195 }
Willy Tarreau0d587112020-07-01 15:04:38 +02001196
1197 if (!found && !is_safe && srv->curr_safe_nb > 0) {
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001198 conn = srv_lookup_conn(&srv->safe_conns_tree[i], hash);
1199 while (conn) {
Olivier Houchard1662cdb2020-07-03 14:04:37 +02001200 if (conn->mux->takeover && conn->mux->takeover(conn, i) == 0) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001201 conn_delete_from_tree(&conn->hash_node->node);
Willy Tarreau0d587112020-07-01 15:04:38 +02001202 _HA_ATOMIC_ADD(&activity[tid].fd_takeover, 1);
1203 found = 1;
1204 is_safe = 1;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001205 tree = srv->safe_conns_tree;
Willy Tarreau0d587112020-07-01 15:04:38 +02001206 break;
1207 }
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001208
1209 conn = srv_lookup_conn_next(conn);
Willy Tarreau0d587112020-07-01 15:04:38 +02001210 }
1211 }
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001212 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[i].idle_conns_lock);
Amaury Denoyelle5f1ded52020-10-14 18:17:03 +02001213 } while (!found && (i = (i + 1 == global.nbthread) ? 0 : i + 1) != stop);
Olivier Houchard566df302020-03-06 18:18:56 +01001214
1215 if (!found)
1216 conn = NULL;
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001217 done:
1218 if (conn) {
Willy Tarreau364f25a2020-07-01 15:55:30 +02001219 _HA_ATOMIC_STORE(&srv->next_takeover, (i + 1 == global.nbthread) ? 0 : i + 1);
Amaury Denoyelle9c13b622020-10-14 18:17:04 +02001220
1221 srv_use_conn(srv, conn);
1222
1223 _HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
1224 _HA_ATOMIC_SUB(conn->flags & CO_FL_SAFE_LIST ? &srv->curr_safe_nb : &srv->curr_idle_nb, 1);
1225 _HA_ATOMIC_SUB(&srv->curr_idle_thr[i], 1);
1226 conn->flags &= ~CO_FL_LIST_MASK;
1227 __ha_barrier_atomic_store();
1228
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001229 if ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_SAFE &&
1230 conn->mux->flags & MX_FL_HOL_RISK) {
1231 /* attach the connection to the session private list
1232 */
1233 conn->owner = s->sess;
Willy Tarreau38b4d2e2020-11-20 17:08:15 +01001234 session_add_conn(s->sess, conn, conn->target);
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001235 }
1236 else {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001237 ebmb_insert(&srv->available_conns_tree[tid],
1238 &conn->hash_node->node,
1239 sizeof(conn->hash_node->hash));
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001240 }
Olivier Houchard566df302020-03-06 18:18:56 +01001241 }
1242 return conn;
1243}
1244
Willy Tarreaubaaee002006-06-26 02:48:02 +02001245/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001246 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001247 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001248 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001249 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001250 * - SF_ERR_NONE if everything's OK
1251 * - SF_ERR_SRVTO if there are no more servers
1252 * - SF_ERR_SRVCL if the connection was refused by the server
1253 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1254 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1255 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001256 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001257 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001258 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001259 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001260int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001261{
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001262 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001263 struct connection *srv_conn = NULL;
Olivier Houchard2442f682018-12-01 17:03:38 +01001264 struct conn_stream *srv_cs = NULL;
Willy Tarreau827aee92011-03-10 16:55:02 +01001265 struct server *srv;
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001266 const int reuse_mode = s->be->options & PR_O_REUSE_MASK;
Willy Tarreau34601a82013-12-15 16:33:46 +01001267 int reuse = 0;
Olivier Houchard5cd62172019-01-04 15:52:26 +01001268 int init_mux = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001269 int err;
Amaury Denoyelleedadf192021-02-12 13:49:42 +01001270#ifdef USE_OPENSSL
Amaury Denoyelle9b626e32021-01-06 17:03:27 +01001271 struct sample *sni_smp = NULL;
Amaury Denoyelleedadf192021-02-12 13:49:42 +01001272#endif
Amaury Denoyelled10a2002021-02-11 19:45:19 +01001273 struct sockaddr_storage *bind_addr;
Amaury Denoyelle1921d202021-01-14 10:15:29 +01001274 int proxy_line_ret;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001275 int64_t hash = 0;
Amaury Denoyelle81c6f762021-01-18 14:57:50 +01001276 struct conn_hash_params hash_params;
1277
1278 /* first, set unique connection parameters and then calculate hash */
1279 memset(&hash_params, 0, sizeof(hash_params));
Amaury Denoyelle1a58aca2021-01-22 16:47:46 +01001280
1281 srv = objt_server(s->target);
1282 hash_params.srv = srv;
1283
Amaury Denoyelle9b626e32021-01-06 17:03:27 +01001284#ifdef USE_OPENSSL
1285 /* 1. sni */
1286 if (srv && srv->ssl_ctx.sni) {
1287 sni_smp = sample_fetch_as_type(s->be, s->sess, s,
1288 SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
1289 srv->ssl_ctx.sni, SMP_T_STR);
Amaury Denoyelle4c098002021-02-17 15:59:02 +01001290
1291 /* only test if the sample is not null as smp_make_safe (called
1292 * before ssl_sock_set_servername) can only fails if this is
1293 * not the case
1294 */
1295 if (sni_smp) {
Amaury Denoyelle36441f42021-02-17 16:25:31 +01001296 hash_params.sni_prehash =
1297 conn_hash_prehash(sni_smp->data.u.str.area,
1298 sni_smp->data.u.str.data);
Amaury Denoyelle9b626e32021-01-06 17:03:27 +01001299 }
1300 }
1301#endif /* USE_OPENSSL */
1302
Amaury Denoyelle01a287f2021-02-11 16:46:53 +01001303 /* 2. destination address */
1304 if (!(s->flags & SF_ADDR_SET)) {
1305 err = alloc_dst_address(&s->target_addr, srv, s);
1306 if (err != SRV_STATUS_OK)
1307 return SF_ERR_INTERNAL;
1308
1309 s->flags |= SF_ADDR_SET;
1310 }
1311
1312 if (srv && (!is_addr(&srv->addr) || srv->flags & SRV_F_MAPPORTS))
1313 hash_params.dst_addr = s->target_addr;
1314
Amaury Denoyelled10a2002021-02-11 19:45:19 +01001315 /* 3. source address */
1316 err = alloc_bind_address(&bind_addr, srv, s);
1317 if (err != SRV_STATUS_OK)
1318 return SF_ERR_INTERNAL;
1319
1320 hash_params.src_addr = bind_addr;
1321
Amaury Denoyelle1921d202021-01-14 10:15:29 +01001322 /* 4. proxy protocol */
1323 if (srv && srv->pp_opts) {
1324 proxy_line_ret = make_proxy_line(trash.area, trash.size, srv, cli_conn, s);
1325 if (proxy_line_ret) {
Amaury Denoyelle36441f42021-02-17 16:25:31 +01001326 hash_params.proxy_prehash =
1327 conn_hash_prehash(trash.area, proxy_line_ret);
Amaury Denoyelle1921d202021-01-14 10:15:29 +01001328 }
1329 }
1330
Amaury Denoyelle1a58aca2021-01-22 16:47:46 +01001331 if (srv)
1332 hash = conn_calculate_hash(&hash_params);
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001333
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001334 /* This will catch some corner cases such as lying connections resulting from
1335 * retries or connect timeouts but will rarely trigger.
Olivier Houchard0fa989f2018-12-05 17:08:55 +01001336 */
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001337 si_release_endpoint(&s->si[1]);
1338
Amaury Denoyellea81bb712021-01-28 17:33:26 +01001339 /* do not reuse if mode is http or if avail list is not allocated */
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001340 if ((s->be->mode != PR_MODE_HTTP) || (srv && !srv->available_conns_tree))
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001341 goto skip_reuse;
1342
Willy Tarreaub0821862019-07-18 19:26:11 +02001343 /* first, search for a matching connection in the session's idle conns */
Amaury Denoyelle293dcc42021-01-25 10:29:35 +01001344 srv_conn = session_get_conn(s->sess, s->target, hash);
Christopher Fauletfcc3d8a2020-07-01 16:36:51 +02001345 if (srv_conn)
1346 reuse = 1;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001347
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001348 if (srv && !reuse && reuse_mode != PR_O_REUSE_NEVR) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001349 /* Below we pick connections from the safe, idle or
1350 * available (which are safe too) lists based
Willy Tarreau449d74a2015-08-05 17:16:33 +02001351 * on the strategy, the fact that this is a first or second
1352 * (retryable) request, with the indicated priority (1 or 2) :
1353 *
1354 * SAFE AGGR ALWS
1355 *
1356 * +-----+-----+ +-----+-----+ +-----+-----+
1357 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1358 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1359 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1360 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1361 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1362 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
Willy Tarreaub0821862019-07-18 19:26:11 +02001363 *
1364 * Idle conns are necessarily looked up on the same thread so
1365 * that there is no concurrency issues.
Willy Tarreau449d74a2015-08-05 17:16:33 +02001366 */
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001367 if (!eb_is_empty(&srv->available_conns_tree[tid])) {
1368 srv_conn = srv_lookup_conn(&srv->available_conns_tree[tid], hash);
1369 if (srv_conn)
1370 reuse = 1;
Willy Tarreau449d74a2015-08-05 17:16:33 +02001371 }
Amaury Denoyelle1399d692021-01-22 19:37:44 +01001372
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001373 /* if no available connections found, search for an idle/safe */
Amaury Denoyelle1399d692021-01-22 19:37:44 +01001374 if (!srv_conn && srv->max_idle_conns && srv->curr_idle_conns > 0) {
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001375 const int not_first_req = s->txn && s->txn->flags & TX_NOT_FIRST;
1376 const int idle = srv->curr_idle_nb > 0;
1377 const int safe = srv->curr_safe_nb > 0;
1378
1379 /* second column of the tables above,
1380 * search for an idle then safe conn */
1381 if (not_first_req) {
1382 if (idle || safe)
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001383 srv_conn = conn_backend_get(s, srv, 0, hash);
Olivier Houchard566df302020-03-06 18:18:56 +01001384 }
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001385 /* first column of the tables above */
1386 else if (reuse_mode >= PR_O_REUSE_AGGR) {
1387 /* search for a safe conn */
1388 if (safe)
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001389 srv_conn = conn_backend_get(s, srv, 1, hash);
Amaury Denoyelleaa890ae2021-01-25 14:43:17 +01001390
1391 /* search for an idle conn if no safe conn found
1392 * on always reuse mode */
1393 if (!srv_conn &&
1394 reuse_mode == PR_O_REUSE_ALWS && idle) {
1395 /* TODO conn_backend_get should not check the
1396 * safe list is this case */
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001397 srv_conn = conn_backend_get(s, srv, 0, hash);
Amaury Denoyelleaa890ae2021-01-25 14:43:17 +01001398 }
Olivier Houchard566df302020-03-06 18:18:56 +01001399 }
Amaury Denoyelle37e25bc2021-01-26 14:35:25 +01001400
Christopher Faulet3d52f0f2020-07-02 15:45:56 +02001401 if (srv_conn)
Olivier Houchard566df302020-03-06 18:18:56 +01001402 reuse = 1;
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001403 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001404 }
1405
Willy Tarreaub0821862019-07-18 19:26:11 +02001406
1407 /* here reuse might have been set above, indicating srv_conn finally
1408 * is OK.
1409 */
Willy Tarreaub0821862019-07-18 19:26:11 +02001410
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001411 if (ha_used_fds > global.tune.pool_high_count && srv && srv->idle_conns_tree) {
1412 struct connection *tokill_conn = NULL;
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001413 struct conn_hash_node *conn_node = NULL;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001414 struct ebmb_node *node = NULL;
Olivier Houchard88698d92019-04-16 19:07:22 +02001415
1416 /* We can't reuse a connection, and e have more FDs than deemd
1417 * acceptable, attempt to kill an idling connection
1418 */
1419 /* First, try from our own idle list */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001420 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001421 node = ebmb_first(&srv->idle_conns_tree[tid]);
1422 if (node) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001423 conn_node = ebmb_entry(node, struct conn_hash_node, node);
1424 tokill_conn = conn_node->conn;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001425 ebmb_delete(node);
Olivier Houchard88698d92019-04-16 19:07:22 +02001426 tokill_conn->mux->destroy(tokill_conn->ctx);
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001427 }
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001428 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[tid].idle_conns_lock);
1429
Olivier Houchard88698d92019-04-16 19:07:22 +02001430 /* If not, iterate over other thread's idling pool, and try to grab one */
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001431 if (!tokill_conn) {
Olivier Houchard88698d92019-04-16 19:07:22 +02001432 int i;
1433
Willy Tarreauc35bcfc2020-06-29 14:43:16 +02001434 for (i = tid; (i = ((i + 1 == global.nbthread) ? 0 : i + 1)) != tid;) {
Willy Tarreau08e2b412019-05-26 11:50:08 +02001435 // just silence stupid gcc which reports an absurd
1436 // out-of-bounds warning for <i> which is always
1437 // exactly zero without threads, but it seems to
1438 // see it possibly larger.
1439 ALREADY_CHECKED(i);
1440
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001441 HA_SPIN_LOCK(IDLE_CONNS_LOCK, &idle_conns[i].idle_conns_lock);
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001442 node = ebmb_first(&srv->idle_conns_tree[i]);
1443 if (node) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001444 conn_node = ebmb_entry(node, struct conn_hash_node, node);
1445 tokill_conn = conn_node->conn;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001446 ebmb_delete(node);
1447 }
1448
1449 if (!tokill_conn) {
1450 node = ebmb_first(&srv->safe_conns_tree[i]);
1451 if (node) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001452 conn_node = ebmb_entry(node, struct conn_hash_node, node);
1453 tokill_conn = conn_node->conn;
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001454 ebmb_delete(node);
1455 }
1456 }
Amaury Denoyelle5c7086f2021-01-11 09:21:52 +01001457 HA_SPIN_UNLOCK(IDLE_CONNS_LOCK, &idle_conns[i].idle_conns_lock);
Amaury Denoyellea3bf62e2021-01-28 10:16:29 +01001458
Olivier Houchard88698d92019-04-16 19:07:22 +02001459 if (tokill_conn) {
1460 /* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
1461
Willy Tarreaua9d7b762020-07-10 08:28:20 +02001462 MT_LIST_ADDQ(&idle_conns[i].toremove_conns,
Amaury Denoyellef232cb32021-01-06 16:14:12 +01001463 (struct mt_list *)&tokill_conn->toremove_list);
Willy Tarreau4d82bf52020-06-28 00:19:17 +02001464 task_wakeup(idle_conns[i].cleanup_task, TASK_WOKEN_OTHER);
Olivier Houchard88698d92019-04-16 19:07:22 +02001465 break;
1466 }
1467 }
1468 }
1469
1470 }
Willy Tarreau34601a82013-12-15 16:33:46 +01001471
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001472 if (reuse) {
Willy Tarreaub0821862019-07-18 19:26:11 +02001473 if (srv_conn->mux) {
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001474 int avail = srv_conn->mux->avail_streams(srv_conn);
1475
1476 if (avail <= 1) {
Olivier Houchard2442f682018-12-01 17:03:38 +01001477 /* No more streams available, remove it from the list */
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001478 conn_delete_from_tree(&srv_conn->hash_node->node);
Olivier Houchard2442f682018-12-01 17:03:38 +01001479 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001480
1481 if (avail >= 1) {
1482 srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001483 if (srv_cs)
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001484 si_attach_cs(&s->si[1], srv_cs);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001485 else
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001486 srv_conn = NULL;
1487 }
Olivier Houchard134a2042018-12-28 14:45:47 +01001488 else
1489 srv_conn = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001490 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001491 /* otherwise srv_conn is left intact */
1492 }
1493 else
1494 srv_conn = NULL;
1495
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001496skip_reuse:
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001497 /* no reuse or failed to reuse the connection above, pick a new one */
1498 if (!srv_conn) {
Christopher Faulet236c93b2020-07-02 09:19:54 +02001499 srv_conn = conn_new(s->target);
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001500 srv_cs = NULL;
Christopher Fauletc64badd2020-07-01 15:12:43 +02001501
Willy Tarreaudc2ac812020-07-15 17:46:32 +02001502 if (srv_conn) {
1503 srv_conn->owner = s->sess;
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001504 if (reuse_mode == PR_O_REUSE_NEVR)
Willy Tarreaudc2ac812020-07-15 17:46:32 +02001505 conn_set_private(srv_conn);
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001506
Amaury Denoyelled10a2002021-02-11 19:45:19 +01001507 srv_conn->src = bind_addr;
Amaury Denoyellef7bdf002021-01-21 09:40:19 +01001508
Amaury Denoyelle01a287f2021-02-11 16:46:53 +01001509 if (!sockaddr_alloc(&srv_conn->dst, 0, 0)) {
1510 conn_free(srv_conn);
1511 return SF_ERR_RESOURCE;
1512 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001513 }
Amaury Denoyelle01a287f2021-02-11 16:46:53 +01001514 else {
Amaury Denoyelled10a2002021-02-11 19:45:19 +01001515 sockaddr_free(&bind_addr);
Amaury Denoyelle01a287f2021-02-11 16:46:53 +01001516 return SF_ERR_RESOURCE;
1517 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001518 }
1519
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001520 /* copy the target address into the connection */
1521 *srv_conn->dst = *s->target_addr;
1522
1523 /* Copy network namespace from client connection */
1524 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
1525
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001526 if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001527 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001528 if (srv)
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001529 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001530 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1531 /* proxies exclusively run on raw_sock right now */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001532 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
Olivier Houchardc0caac22020-03-20 14:26:32 +01001533 if (!(srv_conn->ctrl)) {
1534 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001535 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001536 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001537 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001538 else {
1539 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001540 return SF_ERR_INTERNAL; /* how did we get there ? */
Olivier Houchardc0caac22020-03-20 14:26:32 +01001541 }
Willy Tarreaud02394b2012-05-11 18:32:18 +02001542
Olivier Houchard8af03b32020-01-22 17:34:54 +01001543 srv_cs = si_alloc_cs(&s->si[1], srv_conn);
1544 if (!srv_cs) {
1545 conn_free(srv_conn);
1546 return SF_ERR_RESOURCE;
1547 }
1548 srv_conn->ctx = srv_cs;
Olivier Houchardecffb7d2020-01-24 14:10:55 +01001549#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
Olivier Houchard12950162018-11-23 14:32:08 +01001550 if (!srv ||
Christopher Fauletb4de4202020-07-30 09:10:36 +02001551 (srv->use_ssl != 1 || (!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
1552 srv->mux_proto || s->be->mode != PR_MODE_HTTP))
Olivier Houchard201b9f42018-11-21 00:16:29 +01001553#endif
Olivier Houchard5cd62172019-01-04 15:52:26 +01001554 init_mux = 1;
Christopher Faulet08016ab2020-07-01 16:10:06 +02001555
Willy Tarreauff605db2013-12-20 11:09:51 +01001556 /* process the case where the server requires the PROXY protocol to be sent */
1557 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001558
Willy Tarreau7b004922015-08-04 19:34:21 +02001559 if (srv && srv->pp_opts) {
Alexander Liu2a54bb72019-05-22 19:44:48 +08001560 srv_conn->flags |= CO_FL_SEND_PROXY;
Willy Tarreauff605db2013-12-20 11:09:51 +01001561 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001562 if (cli_conn)
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001563 conn_get_dst(cli_conn);
Willy Tarreauff605db2013-12-20 11:09:51 +01001564 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001565
Alexander Liu2a54bb72019-05-22 19:44:48 +08001566 if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
1567 srv_conn->send_proxy_ofs = 1;
1568 srv_conn->flags |= CO_FL_SOCKS4;
1569 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001570 }
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001571 else if (!conn_xprt_ready(srv_conn)) {
1572 if (srv_conn->mux->reset)
1573 srv_conn->mux->reset(srv_conn);
1574 }
Olivier Houcharde8f5f5d2019-10-25 17:00:54 +02001575 else {
1576 /* Only consider we're doing reuse if the connection was
1577 * ready.
1578 */
1579 if (srv_conn->mux->ctl(srv_conn, MUX_STATUS, NULL) & MUX_STATUS_READY)
1580 s->flags |= SF_SRV_REUSED;
1581 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001582
William Lallemandb7ff6a32012-03-02 14:35:21 +01001583 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001584 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001585 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001586
Willy Tarreau14f8e862012-08-30 22:23:13 +02001587 /* disable lingering */
1588 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001589 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001590
Willy Tarreauf1573842018-12-14 11:35:36 +01001591 if (s->flags & SF_SRV_REUSED) {
Olivier Houchard237f7812019-03-08 18:49:07 +01001592 _HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001593 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001594 _HA_ATOMIC_ADD(&srv->counters.reuse, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001595 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +01001596 _HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001597 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001598 _HA_ATOMIC_ADD(&srv->counters.connect, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001599 }
1600
Olivier Houchard201b9f42018-11-21 00:16:29 +01001601 err = si_connect(&s->si[1], srv_conn);
Willy Tarreau09e02032019-07-18 16:18:20 +02001602 if (err != SF_ERR_NONE)
1603 return err;
1604
Christopher Faulet27bd6ff2020-07-01 11:00:18 +02001605#ifdef USE_OPENSSL
Amaury Denoyelle9b626e32021-01-06 17:03:27 +01001606 if (smp_make_safe(sni_smp))
1607 ssl_sock_set_servername(srv_conn, sni_smp->data.u.str.area);
Christopher Faulet27bd6ff2020-07-01 11:00:18 +02001608#endif /* USE_OPENSSL */
1609
Willy Tarreaua3b17562020-07-31 08:39:31 +02001610 /* The CO_FL_SEND_PROXY flag may have been set by the connect method,
1611 * if so, add our handshake pseudo-XPRT now.
1612 */
1613 if ((srv_conn->flags & CO_FL_HANDSHAKE)) {
1614 if (xprt_add_hs(srv_conn) < 0) {
1615 conn_full_close(srv_conn);
1616 return SF_ERR_INTERNAL;
1617 }
1618 }
1619
Olivier Houchard5cd62172019-01-04 15:52:26 +01001620 /* We have to defer the mux initialization until after si_connect()
1621 * has been called, as we need the xprt to have been properly
1622 * initialized, or any attempt to recv during the mux init may
1623 * fail, and flag the connection as CO_FL_ERROR.
1624 */
1625 if (init_mux) {
Olivier Houchard74931142019-01-29 19:11:16 +01001626 if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
1627 conn_full_close(srv_conn);
Olivier Houchard5cd62172019-01-04 15:52:26 +01001628 return SF_ERR_INTERNAL;
Olivier Houchard74931142019-01-29 19:11:16 +01001629 }
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001630 if (s->be->mode != PR_MODE_HTTP) {
1631 /* If we're doing http-reuse always, and the connection
1632 * is not private with available streams (an http2
1633 * connection), add it to the available list, so that
1634 * others can use it right away. If the connection is
1635 * private or we're doing http-reuse safe and the mux
1636 * protocol supports multiplexing, add it in the
1637 * session server list.
1638 */
1639 if (srv && reuse_mode == PR_O_REUSE_ALWS &&
1640 !(srv_conn->flags & CO_FL_PRIVATE) &&
1641 srv_conn->mux->avail_streams(srv_conn) > 0) {
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001642 ebmb_insert(&srv->available_conns_tree[tid], &srv_conn->hash_node->node, sizeof(srv_conn->hash_node->hash));
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001643 }
1644 else if (srv_conn->flags & CO_FL_PRIVATE ||
1645 (reuse_mode == PR_O_REUSE_SAFE &&
1646 srv_conn->mux->flags & MX_FL_HOL_RISK)) {
1647 /* If it fail now, the same will be done in mux->detach() callback */
1648 session_add_conn(s->sess, srv_conn, srv_conn->target);
1649 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02001650 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001651 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001652
Willy Tarreau5db847a2019-05-09 14:13:35 +02001653#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
Olivier Houchard4cd2af42019-05-06 15:18:27 +02001654
Olivier Houchard8694e5b2019-06-15 00:14:05 +02001655 if (!reuse && cli_conn && srv && srv_conn->mux &&
Olivier Houchard522eea72017-11-03 16:27:47 +01001656 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
Olivier Houchard865d8392019-05-03 22:46:27 +02001657 /* Only attempt to use early data if either the client sent
1658 * early data, so that we know it can handle a 425, or if
1659 * we are allwoed to retry requests on early data failure, and
1660 * it's our first try
1661 */
1662 ((cli_conn->flags & CO_FL_EARLY_DATA) ||
1663 ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
1664 s->si[1].conn_retries == s->be->conn_retries)) &&
1665 !channel_is_empty(si_oc(&s->si[1])) &&
1666 srv_conn->flags & CO_FL_SSL_WAIT_HS)
Olivier Houchard522eea72017-11-03 16:27:47 +01001667 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001668#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001669
Willy Tarreau14f8e862012-08-30 22:23:13 +02001670 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001671 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001672
Willy Tarreau827aee92011-03-10 16:55:02 +01001673 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001674 int count;
1675
Willy Tarreaue7dff022015-04-03 01:14:29 +02001676 s->flags |= SF_CURR_SESS;
Olivier Houchard237f7812019-03-08 18:49:07 +01001677 count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +02001678 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau59b0fec2021-02-17 16:01:37 +01001679 if (s->be->lbprm.server_take_conn)
1680 s->be->lbprm.server_take_conn(srv, 0);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001681 }
1682
Willy Tarreauada4c582020-03-04 16:42:03 +01001683 /* Now handle synchronously connected sockets. We know the stream-int
1684 * is at least in state SI_ST_CON. These ones typically are UNIX
1685 * sockets, socket pairs, and occasionally TCP connections on the
1686 * loopback on a heavily loaded system.
1687 */
1688 if ((srv_conn->flags & CO_FL_ERROR || srv_cs->flags & CS_FL_ERROR))
1689 s->si[1].flags |= SI_FL_ERR;
1690
1691 /* If we had early data, and the handshake ended, then
1692 * we can remove the flag, and attempt to wake the task up,
1693 * in the event there's an analyser waiting for the end of
1694 * the handshake.
1695 */
1696 if (!(srv_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)))
1697 srv_cs->flags &= ~CS_FL_WAIT_FOR_HS;
1698
1699 if (!si_state_in(s->si[1].state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) &&
1700 (srv_conn->flags & CO_FL_WAIT_XPRT) == 0) {
1701 s->si[1].exp = TICK_ETERNITY;
1702 si_oc(&s->si[1])->flags |= CF_WRITE_NULL;
1703 if (s->si[1].state == SI_ST_CON)
1704 s->si[1].state = SI_ST_RDY;
1705 }
1706
1707 /* Report EOI on the channel if it was reached from the mux point of
1708 * view.
1709 *
1710 * Note: This test is only required because si_cs_process is also the SI
1711 * wake callback. Otherwise si_cs_recv()/si_cs_send() already take
1712 * care of it.
1713 */
1714 if ((srv_cs->flags & CS_FL_EOI) && !(si_ic(&s->si[1])->flags & CF_EOI))
1715 si_ic(&s->si[1])->flags |= (CF_EOI|CF_READ_PARTIAL);
1716
Christopher Faulet3f5bcd02020-07-29 22:42:27 +02001717 /* catch all sync connect while the mux is not already installed */
1718 if (!srv_conn->mux && !(srv_conn->flags & CO_FL_WAIT_XPRT)) {
1719 if (conn_create_mux(srv_conn) < 0) {
1720 conn_full_close(srv_conn);
1721 return SF_ERR_INTERNAL;
1722 }
1723 }
1724
Amaury Denoyelle8990b012021-02-19 15:29:16 +01001725 if (srv)
1726 srv_conn->hash_node->hash = hash;
Amaury Denoyelle81c6f762021-01-18 14:57:50 +01001727
Willy Tarreaue7dff022015-04-03 01:14:29 +02001728 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001729}
1730
1731
Willy Tarreaubaaee002006-06-26 02:48:02 +02001732/* This function performs the "redispatch" part of a connection attempt. It
1733 * will assign a server if required, queue the connection if required, and
1734 * handle errors that might arise at this level. It can change the server
1735 * state. It will return 1 if it encounters an error, switches the server
1736 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1737 * that the connection is ready to use.
1738 */
1739
Willy Tarreau87b09662015-04-03 00:22:06 +02001740int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001741{
Willy Tarreau827aee92011-03-10 16:55:02 +01001742 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001743 int conn_err;
1744
1745 /* We know that we don't have any connection pending, so we will
1746 * try to get a new one, and wait in this state if it's queued
1747 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001748 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001749 conn_err = assign_server_and_queue(s);
1750 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001751
Willy Tarreaubaaee002006-06-26 02:48:02 +02001752 switch (conn_err) {
1753 case SRV_STATUS_OK:
1754 break;
1755
Willy Tarreau7c669d72008-06-20 15:04:11 +02001756 case SRV_STATUS_FULL:
1757 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1758 * and we can redispatch to another server, or it is not and we return
1759 * 503. This only makes sense in DIRECT mode however, because normal LB
1760 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001761 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001762 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001763 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001764 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001765 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001766 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001767 sockaddr_free(&s->target_addr);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001768 goto redispatch;
1769 }
1770
Willy Tarreau350f4872014-11-28 14:42:25 +01001771 if (!s->si[1].err_type) {
1772 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001773 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001774
Olivier Houchard237f7812019-03-08 18:49:07 +01001775 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1776 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001777 return 1;
1778
Willy Tarreaubaaee002006-06-26 02:48:02 +02001779 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001780 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001781 if (!s->si[1].err_type) {
1782 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001783 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001784
Olivier Houchard237f7812019-03-08 18:49:07 +01001785 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001786 return 1;
1787
1788 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001789 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1790 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001791 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001792 return 1;
1793
Willy Tarreaubaaee002006-06-26 02:48:02 +02001794 case SRV_STATUS_INTERNAL:
1795 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001796 if (!s->si[1].err_type) {
1797 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001798 }
1799
Willy Tarreau827aee92011-03-10 16:55:02 +01001800 if (srv)
1801 srv_inc_sess_ctr(srv);
1802 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001803 srv_set_sess_last(srv);
1804 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001805 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1806 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001807
Willy Tarreau87b09662015-04-03 00:22:06 +02001808 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001809 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001810 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001811 return 1;
1812 }
1813 /* if we get here, it's because we got SRV_STATUS_OK, which also
1814 * means that the connection has not been queued.
1815 */
1816 return 0;
1817}
1818
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001819/* Check if the connection request is in such a state that it can be aborted. */
1820static int back_may_abort_req(struct channel *req, struct stream *s)
1821{
1822 return ((req->flags & (CF_READ_ERROR)) ||
1823 ((req->flags & (CF_SHUTW_NOW|CF_SHUTW)) && /* empty and client aborted */
1824 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE))));
1825}
1826
1827/* Update back stream interface status for input states SI_ST_ASS, SI_ST_QUE,
1828 * SI_ST_TAR. Other input states are simply ignored.
1829 * Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON
1830 * and SI_ST_EST. Flags must have previously been updated for timeouts and other
1831 * conditions.
1832 */
1833void back_try_conn_req(struct stream *s)
1834{
1835 struct server *srv = objt_server(s->target);
1836 struct stream_interface *si = &s->si[1];
1837 struct channel *req = &s->req;
1838
1839 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1840
1841 if (si->state == SI_ST_ASS) {
1842 /* Server assigned to connection request, we have to try to connect now */
1843 int conn_err;
1844
1845 /* Before we try to initiate the connection, see if the
1846 * request may be aborted instead.
1847 */
1848 if (back_may_abort_req(req, s)) {
1849 si->err_type |= SI_ET_CONN_ABRT;
1850 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1851 goto abort_connection;
1852 }
1853
1854 conn_err = connect_server(s);
1855 srv = objt_server(s->target);
1856
1857 if (conn_err == SF_ERR_NONE) {
1858 /* state = SI_ST_CON or SI_ST_EST now */
1859 if (srv)
1860 srv_inc_sess_ctr(srv);
1861 if (srv)
1862 srv_set_sess_last(srv);
1863 DBG_TRACE_STATE("connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1864 goto end;
1865 }
1866
1867 /* We have received a synchronous error. We might have to
1868 * abort, retry immediately or redispatch.
1869 */
1870 if (conn_err == SF_ERR_INTERNAL) {
1871 if (!si->err_type) {
1872 si->err_type = SI_ET_CONN_OTHER;
1873 }
1874
1875 if (srv)
1876 srv_inc_sess_ctr(srv);
1877 if (srv)
1878 srv_set_sess_last(srv);
1879 if (srv)
1880 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1881 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1882
1883 /* release other streams waiting for this server */
1884 sess_change_server(s, NULL);
1885 if (may_dequeue_tasks(srv, s->be))
1886 process_srv_queue(srv);
1887
1888 /* Failed and not retryable. */
1889 si_shutr(si);
1890 si_shutw(si);
1891 req->flags |= CF_WRITE_ERROR;
1892
1893 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1894
1895 /* we may need to know the position in the queue for logging */
1896 pendconn_cond_unlink(s->pend_pos);
1897
1898 /* no stream was ever accounted for this server */
1899 si->state = SI_ST_CLO;
1900 if (s->srv_error)
1901 s->srv_error(s, si);
1902 DBG_TRACE_STATE("internal error during connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1903 goto end;
1904 }
1905
1906 /* We are facing a retryable error, but we don't want to run a
1907 * turn-around now, as the problem is likely a source port
1908 * allocation problem, so we want to retry now.
1909 */
1910 si->state = SI_ST_CER;
1911 si->flags &= ~SI_FL_ERR;
1912 back_handle_st_cer(s);
1913
1914 DBG_TRACE_STATE("connection error, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1915 /* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
1916 }
1917 else if (si->state == SI_ST_QUE) {
1918 /* connection request was queued, check for any update */
1919 if (!pendconn_dequeue(s)) {
1920 /* The connection is not in the queue anymore. Either
1921 * we have a server connection slot available and we
1922 * go directly to the assigned state, or we need to
1923 * load-balance first and go to the INI state.
1924 */
1925 si->exp = TICK_ETERNITY;
1926 if (unlikely(!(s->flags & SF_ASSIGNED)))
1927 si->state = SI_ST_REQ;
1928 else {
1929 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1930 si->state = SI_ST_ASS;
1931 }
1932 DBG_TRACE_STATE("dequeue connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1933 goto end;
1934 }
1935
1936 /* Connection request still in queue... */
1937 if (si->flags & SI_FL_EXP) {
1938 /* ... and timeout expired */
1939 si->exp = TICK_ETERNITY;
1940 si->flags &= ~SI_FL_EXP;
1941 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1942
1943 /* we may need to know the position in the queue for logging */
1944 pendconn_cond_unlink(s->pend_pos);
1945
1946 if (srv)
1947 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1948 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1949 si_shutr(si);
1950 si_shutw(si);
1951 req->flags |= CF_WRITE_TIMEOUT;
1952 if (!si->err_type)
1953 si->err_type = SI_ET_QUEUE_TO;
1954 si->state = SI_ST_CLO;
1955 if (s->srv_error)
1956 s->srv_error(s, si);
1957 DBG_TRACE_STATE("connection request still queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1958 goto end;
1959 }
1960
1961 /* Connection remains in queue, check if we have to abort it */
1962 if (back_may_abort_req(req, s)) {
1963 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1964
1965 /* we may need to know the position in the queue for logging */
1966 pendconn_cond_unlink(s->pend_pos);
1967
1968 si->err_type |= SI_ET_QUEUE_ABRT;
1969 DBG_TRACE_STATE("abort queued connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1970 goto abort_connection;
1971 }
1972
1973 /* Nothing changed */
1974 }
1975 else if (si->state == SI_ST_TAR) {
1976 /* Connection request might be aborted */
1977 if (back_may_abort_req(req, s)) {
1978 si->err_type |= SI_ET_CONN_ABRT;
1979 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1980 goto abort_connection;
1981 }
1982
1983 if (!(si->flags & SI_FL_EXP))
1984 return; /* still in turn-around */
1985
1986 si->flags &= ~SI_FL_EXP;
1987 si->exp = TICK_ETERNITY;
1988
1989 /* we keep trying on the same server as long as the stream is
1990 * marked "assigned".
1991 * FIXME: Should we force a redispatch attempt when the server is down ?
1992 */
1993 if (s->flags & SF_ASSIGNED)
1994 si->state = SI_ST_ASS;
1995 else
1996 si->state = SI_ST_REQ;
1997
1998 DBG_TRACE_STATE("retry connection now", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1999 }
2000
2001 end:
2002 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2003 return;
2004
2005abort_connection:
2006 /* give up */
2007 si->exp = TICK_ETERNITY;
2008 si->flags &= ~SI_FL_EXP;
2009 si_shutr(si);
2010 si_shutw(si);
2011 si->state = SI_ST_CLO;
2012 if (s->srv_error)
2013 s->srv_error(s, si);
2014 DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2015 return;
2016}
2017
2018/* This function initiates a server connection request on a stream interface
2019 * already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS for
2020 * a real connection to a server, indicating that a server has been assigned,
2021 * or SI_ST_EST for a successful connection to an applet. It may also return
2022 * SI_ST_QUE, or SI_ST_CLO upon error.
2023 */
2024void back_handle_st_req(struct stream *s)
2025{
2026 struct stream_interface *si = &s->si[1];
2027
2028 if (si->state != SI_ST_REQ)
2029 return;
2030
2031 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2032
2033 if (unlikely(obj_type(s->target) == OBJ_TYPE_APPLET)) {
2034 /* the applet directly goes to the EST state */
2035 struct appctx *appctx = objt_appctx(si->end);
2036
2037 if (!appctx || appctx->applet != __objt_applet(s->target))
2038 appctx = si_register_handler(si, objt_applet(s->target));
2039
2040 if (!appctx) {
2041 /* No more memory, let's immediately abort. Force the
2042 * error code to ignore the ERR_LOCAL which is not a
2043 * real error.
2044 */
2045 s->flags &= ~(SF_ERR_MASK | SF_FINST_MASK);
2046
2047 si_shutr(si);
2048 si_shutw(si);
2049 s->req.flags |= CF_WRITE_ERROR;
2050 si->err_type = SI_ET_CONN_RES;
2051 si->state = SI_ST_CLO;
2052 if (s->srv_error)
2053 s->srv_error(s, si);
2054 DBG_TRACE_STATE("failed to register applet", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2055 goto end;
2056 }
2057
2058 if (tv_iszero(&s->logs.tv_request))
2059 s->logs.tv_request = now;
2060 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
2061 si->state = SI_ST_EST;
2062 si->err_type = SI_ET_NONE;
2063 be_set_sess_last(s->be);
2064
2065 DBG_TRACE_STATE("applet registered", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2066 /* let back_establish() finish the job */
2067 goto end;
2068 }
2069
2070 /* Try to assign a server */
2071 if (srv_redispatch_connect(s) != 0) {
2072 /* We did not get a server. Either we queued the
2073 * connection request, or we encountered an error.
2074 */
2075 if (si->state == SI_ST_QUE) {
2076 DBG_TRACE_STATE("connection request queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2077 goto end;
2078 }
2079
2080 /* we did not get any server, let's check the cause */
2081 si_shutr(si);
2082 si_shutw(si);
2083 s->req.flags |= CF_WRITE_ERROR;
2084 if (!si->err_type)
2085 si->err_type = SI_ET_CONN_OTHER;
2086 si->state = SI_ST_CLO;
2087 if (s->srv_error)
2088 s->srv_error(s, si);
2089 DBG_TRACE_STATE("connection request failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2090 goto end;
2091 }
2092
2093 /* The server is assigned */
2094 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
2095 si->state = SI_ST_ASS;
2096 be_set_sess_last(s->be);
2097 DBG_TRACE_STATE("connection request assigned to a server", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2098
2099 end:
2100 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2101}
2102
2103/* This function is called with (si->state == SI_ST_CON) meaning that a
2104 * connection was attempted and that the file descriptor is already allocated.
2105 * We must check for timeout, error and abort. Possible output states are
2106 * SI_ST_CER (error), SI_ST_DIS (abort), and SI_ST_CON (no change). This only
2107 * works with connection-based streams. We know that there were no I/O event
2108 * when reaching this function. Timeouts and errors are *not* cleared.
2109 */
2110void back_handle_st_con(struct stream *s)
2111{
2112 struct stream_interface *si = &s->si[1];
2113 struct channel *req = &s->req;
2114 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002115
2116 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2117
2118 /* the client might want to abort */
2119 if ((rep->flags & CF_SHUTW) ||
2120 ((req->flags & CF_SHUTW_NOW) &&
2121 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2122 si->flags |= SI_FL_NOLINGER;
2123 si_shutw(si);
2124 si->err_type |= SI_ET_CONN_ABRT;
2125 if (s->srv_error)
2126 s->srv_error(s, si);
2127 /* Note: state = SI_ST_DIS now */
2128 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 +01002129 goto end;
2130 }
2131
Willy Tarreau062df2c2020-01-10 06:17:03 +01002132 done:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002133 /* retryable error ? */
Willy Tarreau062df2c2020-01-10 06:17:03 +01002134 if (si->flags & (SI_FL_EXP|SI_FL_ERR)) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002135 if (!si->err_type) {
2136 if (si->flags & SI_FL_ERR)
2137 si->err_type = SI_ET_CONN_ERR;
2138 else
2139 si->err_type = SI_ET_CONN_TO;
2140 }
2141
2142 si->state = SI_ST_CER;
2143 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2144 }
2145
Willy Tarreau062df2c2020-01-10 06:17:03 +01002146 end:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002147 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2148}
2149
2150/* This function is called with (si->state == SI_ST_CER) meaning that a
2151 * previous connection attempt has failed and that the file descriptor
2152 * has already been released. Possible causes include asynchronous error
2153 * notification and time out. Possible output states are SI_ST_CLO when
2154 * retries are exhausted, SI_ST_TAR when a delay is wanted before a new
2155 * connection attempt, SI_ST_ASS when it's wise to retry on the same server,
2156 * and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
2157 * marked as in error state. Timeouts and errors are cleared before retrying.
2158 */
2159void back_handle_st_cer(struct stream *s)
2160{
2161 struct stream_interface *si = &s->si[1];
2162 struct conn_stream *cs = objt_cs(si->end);
2163 struct connection *conn = cs_conn(cs);
2164
2165 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2166
2167 si->exp = TICK_ETERNITY;
2168 si->flags &= ~SI_FL_EXP;
2169
2170 /* we probably have to release last stream from the server */
2171 if (objt_server(s->target)) {
2172 health_adjust(objt_server(s->target), HANA_STATUS_L4_ERR);
2173
2174 if (s->flags & SF_CURR_SESS) {
2175 s->flags &= ~SF_CURR_SESS;
2176 _HA_ATOMIC_SUB(&__objt_server(s->target)->cur_sess, 1);
2177 }
2178
2179 if ((si->flags & SI_FL_ERR) &&
2180 conn && conn->err_code == CO_ER_SSL_MISMATCH_SNI) {
2181 /* We tried to connect to a server which is configured
2182 * with "verify required" and which doesn't have the
2183 * "verifyhost" directive. The server presented a wrong
2184 * certificate (a certificate for an unexpected name),
2185 * which implies that we have used SNI in the handshake,
2186 * and that the server doesn't have the associated cert
2187 * and presented a default one.
2188 *
2189 * This is a serious enough issue not to retry. It's
2190 * especially important because this wrong name might
2191 * either be the result of a configuration error, and
2192 * retrying will only hammer the server, or is caused
2193 * by the use of a wrong SNI value, most likely
2194 * provided by the client and we don't want to let the
2195 * client provoke retries.
2196 */
2197 si->conn_retries = 0;
2198 DBG_TRACE_DEVEL("Bad SSL cert, disable connection retries", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2199 }
2200 }
2201
2202 /* ensure that we have enough retries left */
2203 si->conn_retries--;
2204 if (si->conn_retries < 0 || !(s->be->retry_type & PR_RE_CONN_FAILED)) {
2205 if (!si->err_type) {
2206 si->err_type = SI_ET_CONN_ERR;
2207 }
2208
2209 if (objt_server(s->target))
2210 _HA_ATOMIC_ADD(&objt_server(s->target)->counters.failed_conns, 1);
2211 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
2212 sess_change_server(s, NULL);
2213 if (may_dequeue_tasks(objt_server(s->target), s->be))
2214 process_srv_queue(objt_server(s->target));
2215
2216 /* shutw is enough so stop a connecting socket */
2217 si_shutw(si);
2218 s->req.flags |= CF_WRITE_ERROR;
2219 s->res.flags |= CF_READ_ERROR;
2220
2221 si->state = SI_ST_CLO;
2222 if (s->srv_error)
2223 s->srv_error(s, si);
2224
2225 DBG_TRACE_STATE("connection failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2226 goto end;
2227 }
2228
2229 stream_choose_redispatch(s);
2230
2231 if (si->flags & SI_FL_ERR) {
2232 /* The error was an asynchronous connection error, and we will
2233 * likely have to retry connecting to the same server, most
2234 * likely leading to the same result. To avoid this, we wait
2235 * MIN(one second, connect timeout) before retrying. We don't
2236 * do it when the failure happened on a reused connection
2237 * though.
2238 */
2239
2240 int delay = 1000;
2241
2242 if (s->be->timeout.connect && s->be->timeout.connect < delay)
2243 delay = s->be->timeout.connect;
2244
2245 if (!si->err_type)
2246 si->err_type = SI_ET_CONN_ERR;
2247
2248 /* only wait when we're retrying on the same server */
2249 if ((si->state == SI_ST_ASS ||
2250 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_RR ||
2251 (s->be->srv_act <= 1)) && !(s->flags & SF_SRV_REUSED)) {
2252 si->state = SI_ST_TAR;
2253 si->exp = tick_add(now_ms, MS_TO_TICKS(delay));
2254 }
2255 si->flags &= ~SI_FL_ERR;
2256 DBG_TRACE_STATE("retry a new connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2257 }
2258
2259 end:
2260 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2261}
2262
2263/* This function is called with (si->state == SI_ST_RDY) meaning that a
2264 * connection was attempted, that the file descriptor is already allocated,
2265 * and that it has succeeded. We must still check for errors and aborts.
2266 * Possible output states are SI_ST_EST (established), SI_ST_CER (error),
2267 * and SI_ST_DIS (abort). This only works with connection-based streams.
2268 * Timeouts and errors are *not* cleared.
2269 */
2270void back_handle_st_rdy(struct stream *s)
2271{
2272 struct stream_interface *si = &s->si[1];
2273 struct channel *req = &s->req;
2274 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002275
2276 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2277 /* We know the connection at least succeeded, though it could have
2278 * since met an error for any other reason. At least it didn't time out
Thayne McCombs8f0cc5c2021-01-07 21:35:52 -07002279 * even though the timeout might have been reported right after success.
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002280 * We need to take care of various situations here :
2281 * - everything might be OK. We have to switch to established.
2282 * - an I/O error might have been reported after a successful transfer,
2283 * which is not retryable and needs to be logged correctly, and needs
2284 * established as well
2285 * - SI_ST_CON implies !CF_WROTE_DATA but not conversely as we could
2286 * have validated a connection with incoming data (e.g. TCP with a
2287 * banner protocol), or just a successful connect() probe.
2288 * - the client might have requested a connection abort, this needs to
2289 * be checked before we decide to retry anything.
2290 */
2291
2292 /* it's still possible to handle client aborts or connection retries
2293 * before any data were sent.
2294 */
2295 if (!(req->flags & CF_WROTE_DATA)) {
2296 /* client abort ? */
2297 if ((rep->flags & CF_SHUTW) ||
2298 ((req->flags & CF_SHUTW_NOW) &&
2299 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2300 /* give up */
2301 si->flags |= SI_FL_NOLINGER;
2302 si_shutw(si);
2303 si->err_type |= SI_ET_CONN_ABRT;
2304 if (s->srv_error)
2305 s->srv_error(s, si);
2306 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2307 goto end;
2308 }
2309
2310 /* retryable error ? */
2311 if (si->flags & SI_FL_ERR) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002312 if (!si->err_type)
2313 si->err_type = SI_ET_CONN_ERR;
2314 si->state = SI_ST_CER;
2315 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2316 goto end;
2317 }
2318 }
2319
2320 /* data were sent and/or we had no error, back_establish() will
2321 * now take over.
2322 */
2323 DBG_TRACE_STATE("connection established", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2324 si->err_type = SI_ET_NONE;
2325 si->state = SI_ST_EST;
2326
2327 end:
2328 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2329}
2330
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002331/* sends a log message when a backend goes down, and also sets last
2332 * change date.
2333 */
2334void set_backend_down(struct proxy *be)
2335{
2336 be->last_change = now.tv_sec;
Olivier Houchard237f7812019-03-08 18:49:07 +01002337 _HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002338
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002339 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01002340 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002341 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
2342 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002343}
2344
Willy Tarreau87b09662015-04-03 00:22:06 +02002345/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002346 * tries to extract an RDP cookie from the request buffer, and look for the
2347 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02002348 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002349 * list. Nothing is performed if a server was already assigned.
2350 */
Willy Tarreau87b09662015-04-03 00:22:06 +02002351int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002352{
2353 struct proxy *px = s->be;
2354 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02002355 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002356 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01002357 uint16_t port;
2358 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002359 char *p;
2360
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002361 DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002362
Willy Tarreaue7dff022015-04-03 01:14:29 +02002363 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002364 goto no_cookie;
2365
Willy Tarreau37406352012-04-23 16:16:37 +02002366 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002367
Willy Tarreaucadd8c92013-07-22 18:09:52 +02002368 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002369 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002370 goto no_cookie;
2371
Willy Tarreau04276f32017-01-06 17:41:29 +01002372 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
2373 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
2374 * server's IP address in network order, and "port" is the integer corresponding to the
2375 * server's port in network order. Comments please Emeric.
2376 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002377 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002378 if (*p != '.')
2379 goto no_cookie;
2380 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01002381
2382 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002383 if (*p != '.')
2384 goto no_cookie;
2385
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002386 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002387 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02002388 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01002389 port == srv->svc_port &&
2390 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002391 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002392 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02002393 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002394 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002395 break;
2396 }
2397 }
2398 srv = srv->next;
2399 }
2400
2401no_cookie:
2402 req->analysers &= ~an_bit;
2403 req->analyse_exp = TICK_ETERNITY;
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002404 DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002405 return 1;
2406}
2407
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002408int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01002409 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002410 return px->down_time;
2411
2412 return now.tv_sec - px->last_change + px->down_time;
2413}
Willy Tarreaubaaee002006-06-26 02:48:02 +02002414
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002415/*
2416 * This function returns a string containing the balancing
2417 * mode of the proxy in a format suitable for stats.
2418 */
2419
2420const char *backend_lb_algo_str(int algo) {
2421
2422 if (algo == BE_LB_ALGO_RR)
2423 return "roundrobin";
2424 else if (algo == BE_LB_ALGO_SRR)
2425 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01002426 else if (algo == BE_LB_ALGO_FAS)
2427 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002428 else if (algo == BE_LB_ALGO_LC)
2429 return "leastconn";
2430 else if (algo == BE_LB_ALGO_SH)
2431 return "source";
2432 else if (algo == BE_LB_ALGO_UH)
2433 return "uri";
2434 else if (algo == BE_LB_ALGO_PH)
2435 return "url_param";
2436 else if (algo == BE_LB_ALGO_HH)
2437 return "hdr";
2438 else if (algo == BE_LB_ALGO_RCH)
2439 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002440 else if (algo == BE_LB_ALGO_NONE)
2441 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002442 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002443 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002444}
2445
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002446/* This function parses a "balance" statement in a backend section describing
2447 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002448 * returns -1, it will write an error message into the <err> buffer which will
2449 * automatically be allocated and must be passed as NULL. The trailing '\n'
2450 * will not be written. The function must be called with <args> pointing to the
2451 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002452 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002453int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002454{
2455 if (!*(args[0])) {
2456 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01002457 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2458 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002459 return 0;
2460 }
2461
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002462 if (strcmp(args[0], "roundrobin") == 0) {
Willy Tarreau31682232007-11-29 15:38:04 +01002463 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2464 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002465 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002466 else if (strcmp(args[0], "static-rr") == 0) {
Willy Tarreau9757a382009-10-03 12:56:50 +02002467 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2468 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
2469 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002470 else if (strcmp(args[0], "first") == 0) {
Willy Tarreauf09c6602012-02-13 17:12:08 +01002471 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2472 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
2473 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002474 else if (strcmp(args[0], "leastconn") == 0) {
Willy Tarreau51406232008-03-10 22:04:20 +01002475 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2476 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
2477 }
Willy Tarreau21c741a2019-01-14 18:14:27 +01002478 else if (!strncmp(args[0], "random", 6)) {
Willy Tarreau760e81d2018-05-03 07:20:40 +02002479 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2480 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
Willy Tarreau21c741a2019-01-14 18:14:27 +01002481 curproxy->lbprm.arg_opt1 = 2;
2482
2483 if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
2484 const char *beg;
2485 char *end;
2486
2487 beg = args[0] + 7;
2488 curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
2489
2490 if (*end != ')') {
2491 if (!*end)
2492 memprintf(err, "random : missing closing parenthesis.");
2493 else
2494 memprintf(err, "random : unexpected character '%c' after argument.", *end);
2495 return -1;
2496 }
2497
2498 if (curproxy->lbprm.arg_opt1 < 1) {
2499 memprintf(err, "random : number of draws must be at least 1.");
2500 return -1;
2501 }
2502 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02002503 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002504 else if (strcmp(args[0], "source") == 0) {
Willy Tarreau31682232007-11-29 15:38:04 +01002505 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2506 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002507 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002508 else if (strcmp(args[0], "uri") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002509 int arg = 1;
2510
Willy Tarreau31682232007-11-29 15:38:04 +01002511 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2512 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Willy Tarreau57a37412020-09-23 08:56:29 +02002513 curproxy->lbprm.arg_opt1 = 0; // "whole", "path-only"
Willy Tarreaua9a72492019-01-14 16:14:15 +01002514 curproxy->lbprm.arg_opt2 = 0; // "len"
2515 curproxy->lbprm.arg_opt3 = 0; // "depth"
Oskar Stolc8dc41842012-05-19 10:19:54 +01002516
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002517 while (*args[arg]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002518 if (strcmp(args[arg], "len") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002519 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002520 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002521 return -1;
2522 }
Willy Tarreaua9a72492019-01-14 16:14:15 +01002523 curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002524 arg += 2;
2525 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002526 else if (strcmp(args[arg], "depth") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002527 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002528 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002529 return -1;
2530 }
2531 /* hint: we store the position of the ending '/' (depth+1) so
2532 * that we avoid a comparison while computing the hash.
2533 */
Willy Tarreaua9a72492019-01-14 16:14:15 +01002534 curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002535 arg += 2;
2536 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002537 else if (strcmp(args[arg], "whole") == 0) {
Willy Tarreau3d1119d2020-09-23 08:05:47 +02002538 curproxy->lbprm.arg_opt1 |= 1;
Oskar Stolc8dc41842012-05-19 10:19:54 +01002539 arg += 1;
2540 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002541 else if (strcmp(args[arg], "path-only") == 0) {
Willy Tarreau57a37412020-09-23 08:56:29 +02002542 curproxy->lbprm.arg_opt1 |= 2;
2543 arg += 1;
2544 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002545 else {
Willy Tarreau57a37412020-09-23 08:56:29 +02002546 memprintf(err, "%s only accepts parameters 'len', 'depth', 'path-only', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002547 return -1;
2548 }
2549 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002550 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002551 else if (strcmp(args[0], "url_param") == 0) {
Willy Tarreau01732802007-11-01 22:48:15 +01002552 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002553 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01002554 return -1;
2555 }
Willy Tarreau31682232007-11-29 15:38:04 +01002556 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2557 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02002558
Willy Tarreau4c03d1c2019-01-14 15:23:54 +01002559 free(curproxy->lbprm.arg_str);
2560 curproxy->lbprm.arg_str = strdup(args[1]);
2561 curproxy->lbprm.arg_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002562 if (*args[2]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002563 if (strcmp(args[2], "check_post") != 0) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002564 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002565 return -1;
2566 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002567 }
Benoitaffb4812009-03-25 13:02:10 +01002568 }
2569 else if (!strncmp(args[0], "hdr(", 4)) {
2570 const char *beg, *end;
2571
2572 beg = args[0] + 4;
2573 end = strchr(beg, ')');
2574
2575 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002576 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01002577 return -1;
2578 }
2579
2580 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2581 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
2582
Willy Tarreau484ff072019-01-14 15:28:53 +01002583 free(curproxy->lbprm.arg_str);
2584 curproxy->lbprm.arg_len = end - beg;
2585 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
Willy Tarreau9fed8582019-01-14 16:04:54 +01002586 curproxy->lbprm.arg_opt1 = 0;
Benoitaffb4812009-03-25 13:02:10 +01002587
2588 if (*args[1]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002589 if (strcmp(args[1], "use_domain_only") != 0) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002590 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01002591 return -1;
2592 }
Willy Tarreau9fed8582019-01-14 16:04:54 +01002593 curproxy->lbprm.arg_opt1 = 1;
Benoitaffb4812009-03-25 13:02:10 +01002594 }
Emeric Brun736aa232009-06-30 17:56:00 +02002595 }
2596 else if (!strncmp(args[0], "rdp-cookie", 10)) {
2597 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2598 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
2599
2600 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
2601 const char *beg, *end;
2602
2603 beg = args[0] + 11;
2604 end = strchr(beg, ')');
2605
2606 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002607 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002608 return -1;
2609 }
2610
Willy Tarreau484ff072019-01-14 15:28:53 +01002611 free(curproxy->lbprm.arg_str);
2612 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
2613 curproxy->lbprm.arg_len = end - beg;
Emeric Brun736aa232009-06-30 17:56:00 +02002614 }
2615 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
Willy Tarreau484ff072019-01-14 15:28:53 +01002616 free(curproxy->lbprm.arg_str);
2617 curproxy->lbprm.arg_str = strdup("mstshash");
2618 curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
Emeric Brun736aa232009-06-30 17:56:00 +02002619 }
2620 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002621 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002622 return -1;
2623 }
Willy Tarreau01732802007-11-01 22:48:15 +01002624 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002625 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002626 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 +01002627 return -1;
2628 }
2629 return 0;
2630}
2631
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002632
2633/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002634/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002635/************************************************************************/
2636
Willy Tarreau34db1082012-04-19 17:16:54 +02002637/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002638 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002639 * undefined behaviour.
2640 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002641static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002642smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002643{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002644 struct proxy *px;
2645
Willy Tarreau37406352012-04-23 16:16:37 +02002646 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002647 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002648 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002649
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002650 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002651
2652 return 1;
2653}
2654
Willy Tarreau37406352012-04-23 16:16:37 +02002655/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002656 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02002657 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2658 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002659 */
2660static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002661smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002662{
Willy Tarreau24e32d82012-04-23 23:55:44 +02002663 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002664
Willy Tarreau37406352012-04-23 16:16:37 +02002665 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002666 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02002667 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
2668 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002669 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002670 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002671 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002672 return 1;
2673}
2674
Willy Tarreau34db1082012-04-19 17:16:54 +02002675/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002676 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002677 * undefined behaviour.
2678 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002679static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002680smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002681{
2682 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02002683
Willy Tarreau37406352012-04-23 16:16:37 +02002684 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002685 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002686 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002687
Willy Tarreau24e32d82012-04-23 23:55:44 +02002688 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002689 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002690 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002691
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002692 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01002693 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002694 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002695 return 1;
2696 }
2697
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002698 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02002699 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002700 }
2701
2702 return 1;
2703}
2704
Willy Tarreaua5e37562011-12-16 17:06:15 +01002705/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002706static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002707smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002708{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002709 struct proxy *px = NULL;
2710
2711 if (smp->strm)
2712 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002713 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002714 px = __objt_check(smp->sess->origin)->proxy;
2715 if (!px)
Willy Tarreaube508f12016-03-10 11:47:01 +01002716 return 0;
2717
Willy Tarreauf853c462012-04-23 18:53:56 +02002718 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002719 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002720 smp->data.u.sint = px->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002721 return 1;
2722}
2723
Marcin Deranekd2471c22016-12-12 14:08:05 +01002724/* set string to the name of the backend */
2725static int
2726smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2727{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002728 struct proxy *px = NULL;
2729
2730 if (smp->strm)
2731 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002732 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002733 px = __objt_check(smp->sess->origin)->proxy;
2734 if (!px)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002735 return 0;
2736
Christopher Fauletd1b44642020-04-30 09:51:15 +02002737 smp->data.u.str.area = (char *)px->id;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002738 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002739 return 0;
2740
2741 smp->data.type = SMP_T_STR;
2742 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002743 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01002744
2745 return 1;
2746}
2747
Willy Tarreaua5e37562011-12-16 17:06:15 +01002748/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002749static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002750smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002751{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002752 struct server *srv = NULL;
Willy Tarreaube508f12016-03-10 11:47:01 +01002753
Christopher Fauletd1b44642020-04-30 09:51:15 +02002754 if (smp->strm)
2755 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002756 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002757 srv = __objt_check(smp->sess->origin)->server;
2758 if (!srv)
Willy Tarreau17af4192011-02-23 14:27:06 +01002759 return 0;
2760
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002761 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002762 smp->data.u.sint = srv->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002763
2764 return 1;
2765}
2766
vkill1dfd1652019-10-30 16:58:14 +08002767/* set string to the name of the server */
2768static int
2769smp_fetch_srv_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2770{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002771 struct server *srv = NULL;
vkill1dfd1652019-10-30 16:58:14 +08002772
Christopher Fauletd1b44642020-04-30 09:51:15 +02002773 if (smp->strm)
2774 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002775 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002776 srv = __objt_check(smp->sess->origin)->server;
2777 if (!srv)
vkill1dfd1652019-10-30 16:58:14 +08002778 return 0;
2779
Christopher Fauletd1b44642020-04-30 09:51:15 +02002780 smp->data.u.str.area = srv->id;
vkill1dfd1652019-10-30 16:58:14 +08002781 if (!smp->data.u.str.area)
2782 return 0;
2783
2784 smp->data.type = SMP_T_STR;
2785 smp->data.u.str.data = strlen(smp->data.u.str.area);
2786
2787 return 1;
2788}
2789
Willy Tarreau34db1082012-04-19 17:16:54 +02002790/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002791 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002792 * undefined behaviour.
2793 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002794static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002795smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002796{
Willy Tarreau37406352012-04-23 16:16:37 +02002797 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002798 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002799 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002800 return 1;
2801}
2802
Willy Tarreau34db1082012-04-19 17:16:54 +02002803/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002804 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002805 * undefined behaviour.
2806 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002807static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002808smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002809{
Willy Tarreau37406352012-04-23 16:16:37 +02002810 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002811 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002812 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02002813 return 1;
2814}
2815
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002816/* set temp integer to the number of available connections across available
2817 * servers on the backend.
2818 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
2819 * undefined behaviour.
2820 */
2821static int
2822smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2823{
2824 struct server *iterator;
2825 struct proxy *px;
2826 unsigned int maxconn;
2827
2828 smp->flags = SMP_F_VOL_TEST;
2829 smp->data.type = SMP_T_SINT;
2830 smp->data.u.sint = 0;
2831
2832 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
2833 if (iterator->cur_state == SRV_ST_STOPPED)
2834 continue;
2835
2836 px = iterator->proxy;
2837 if (!srv_currently_usable(iterator) ||
2838 ((iterator->flags & SRV_F_BACKUP) &&
2839 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
2840 continue;
2841
2842 if (iterator->maxconn == 0) {
2843 /* one active server is unlimited, return -1 */
2844 smp->data.u.sint = -1;
2845 return 1;
2846 }
2847
2848 maxconn = srv_dynamic_maxconn(iterator);
2849 if (maxconn > iterator->cur_sess)
2850 smp->data.u.sint += maxconn - iterator->cur_sess;
2851 }
2852
2853 return 1;
2854}
2855
Willy Tarreau34db1082012-04-19 17:16:54 +02002856/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002857 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002858 * undefined behaviour.
2859 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002860static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002861smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002862{
Willy Tarreau37406352012-04-23 16:16:37 +02002863 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002864 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002865 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02002866 return 1;
2867}
2868
Willy Tarreaua5e37562011-12-16 17:06:15 +01002869/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02002870 * by the number of running servers and rounded up. If there is no running
2871 * server, we return twice the total, just as if we had half a running server.
2872 * This is more or less correct anyway, since we expect the last server to come
2873 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002874 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002875 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02002876 */
2877static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002878smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002879{
2880 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002881 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02002882
Willy Tarreau37406352012-04-23 16:16:37 +02002883 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002884 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002885 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02002886
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002887 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02002888
2889 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002890 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02002891 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002892 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02002893
2894 return 1;
2895}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002896
Willy Tarreau34db1082012-04-19 17:16:54 +02002897/* set temp integer to the number of concurrent connections on the server in the backend.
2898 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2899 * undefined behaviour.
2900 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002901static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002902smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002903{
Willy Tarreauf853c462012-04-23 18:53:56 +02002904 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002905 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002906 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002907 return 1;
2908}
2909
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002910/* set temp integer to the number of available connections on the server in the backend.
2911 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2912 * undefined behaviour.
2913 */
2914static int
2915smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2916{
2917 unsigned int maxconn;
2918
2919 smp->flags = SMP_F_VOL_TEST;
2920 smp->data.type = SMP_T_SINT;
2921
2922 if (args->data.srv->maxconn == 0) {
2923 /* one active server is unlimited, return -1 */
2924 smp->data.u.sint = -1;
2925 return 1;
2926 }
2927
2928 maxconn = srv_dynamic_maxconn(args->data.srv);
2929 if (maxconn > args->data.srv->cur_sess)
2930 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
2931 else
2932 smp->data.u.sint = 0;
2933
2934 return 1;
2935}
2936
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002937/* set temp integer to the number of connections pending in the server's queue.
2938 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2939 * undefined behaviour.
2940 */
2941static int
2942smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
2943{
2944 smp->flags = SMP_F_VOL_TEST;
2945 smp->data.type = SMP_T_SINT;
2946 smp->data.u.sint = args->data.srv->nbpend;
2947 return 1;
2948}
2949
Tait Clarridge7896d522012-12-05 21:39:31 -05002950/* set temp integer to the number of enabled servers on the proxy.
2951 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2952 * undefined behaviour.
2953 */
2954static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002955smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05002956{
2957 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002958 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002959 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05002960 return 1;
2961}
2962
Christopher Faulet1bea8652020-07-10 16:03:45 +02002963/* set temp integer to the server weight.
2964 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2965 * undefined behaviour.
2966 */
2967static int
2968smp_fetch_srv_weight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2969{
2970 struct server *srv = args->data.srv;
2971 struct proxy *px = srv->proxy;
2972
2973 smp->flags = SMP_F_VOL_TEST;
2974 smp->data.type = SMP_T_SINT;
2975 smp->data.u.sint = (srv->cur_eweight * px->lbprm.wmult + px->lbprm.wdiv - 1) / px->lbprm.wdiv;
2976 return 1;
2977}
2978
2979/* set temp integer to the server initial weight.
2980 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2981 * undefined behaviour.
2982 */
2983static int
2984smp_fetch_srv_iweight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2985{
2986 smp->flags = SMP_F_VOL_TEST;
2987 smp->data.type = SMP_T_SINT;
2988 smp->data.u.sint = args->data.srv->iweight;
2989 return 1;
2990}
2991
2992/* set temp integer to the server user-specified weight.
2993 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2994 * undefined behaviour.
2995 */
2996static int
2997smp_fetch_srv_uweight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2998{
2999 smp->flags = SMP_F_VOL_TEST;
3000 smp->data.type = SMP_T_SINT;
3001 smp->data.u.sint = args->data.srv->uweight;
3002 return 1;
3003}
3004
Amaury Denoyelled91d7792020-12-10 13:43:56 +01003005static int
3006smp_fetch_be_server_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
3007{
3008 struct proxy *px = NULL;
3009
3010 if (smp->strm)
3011 px = smp->strm->be;
3012 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
3013 px = __objt_check(smp->sess->origin)->proxy;
3014 if (!px)
3015 return 0;
3016
3017 smp->flags = SMP_F_VOL_TXN;
3018 smp->data.type = SMP_T_SINT;
3019 smp->data.u.sint = TICKS_TO_MS(px->timeout.server);
3020 return 1;
3021}
3022
3023static int
3024smp_fetch_be_tunnel_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
3025{
3026 struct proxy *px = NULL;
3027
3028 if (smp->strm)
3029 px = smp->strm->be;
3030 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
3031 px = __objt_check(smp->sess->origin)->proxy;
3032 if (!px)
3033 return 0;
3034
3035 smp->flags = SMP_F_VOL_TXN;
3036 smp->data.type = SMP_T_SINT;
3037 smp->data.u.sint = TICKS_TO_MS(px->timeout.tunnel);
3038 return 1;
3039}
3040
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003041static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
3042{
3043
3044 struct proxy *px;
3045
3046 if (!smp_make_safe(smp))
3047 return 0;
3048
Willy Tarreau843b7cb2018-07-13 10:54:26 +02003049 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003050 if (!px)
3051 return 0;
3052
3053 smp->data.type = SMP_T_SINT;
3054 smp->data.u.sint = be_usable_srv(px);
3055
3056 return 1;
3057}
3058
Nenad Merdanovic177adc92019-08-27 01:58:13 +02003059static int
3060sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
3061{
3062 struct proxy *px;
3063 struct server *srv;
3064 char *bksep;
3065
3066 if (!smp_make_safe(smp))
3067 return 0;
3068
3069 bksep = strchr(smp->data.u.str.area, '/');
3070
3071 if (bksep) {
3072 *bksep = '\0';
3073 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
3074 if (!px)
3075 return 0;
3076 smp->data.u.str.area = bksep + 1;
3077 } else {
3078 if (!(smp->px->cap & PR_CAP_BE))
3079 return 0;
3080 px = smp->px;
3081 }
3082
3083 srv = server_find_by_name(px, smp->data.u.str.area);
3084 if (!srv)
3085 return 0;
3086
3087 smp->data.type = SMP_T_SINT;
3088 smp->data.u.sint = srv->nbpend;
3089 return 1;
3090}
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003091
3092/* Note: must not be declared <const> as its list will be overwritten.
3093 * Please take care of keeping this list alphabetically sorted.
3094 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02003095static struct sample_fetch_kw_list smp_kws = {ILH, {
Amaury Denoyelled91d7792020-12-10 13:43:56 +01003096 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3097 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3098 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3099 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3100 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
3101 { "be_server_timeout", smp_fetch_be_server_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3102 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3103 { "be_tunnel_timeout", smp_fetch_be_tunnel_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3104 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3105 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3106 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3107 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3108 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3109 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
3110 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
3111 { "srv_name", smp_fetch_srv_name, 0, NULL, SMP_T_STR, SMP_USE_SERVR, },
3112 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3113 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3114 { "srv_weight", smp_fetch_srv_weight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3115 { "srv_iweight", smp_fetch_srv_iweight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3116 { "srv_uweight", smp_fetch_srv_uweight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003117 { /* END */ },
3118}};
3119
Willy Tarreau0108d902018-11-25 19:14:37 +01003120INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
3121
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003122/* Note: must not be declared <const> as its list will be overwritten */
3123static struct sample_conv_kw_list sample_conv_kws = {ILH, {
Nenad Merdanovic177adc92019-08-27 01:58:13 +02003124 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
3125 { "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003126 { /* END */ },
3127}};
3128
Willy Tarreau0108d902018-11-25 19:14:37 +01003129INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003130
Willy Tarreau61612d42012-04-19 18:42:05 +02003131/* Note: must not be declared <const> as its list will be overwritten.
3132 * Please take care of keeping this list alphabetically sorted.
3133 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02003134static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003135 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01003136}};
3137
Willy Tarreau0108d902018-11-25 19:14:37 +01003138INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01003139
Willy Tarreaubaaee002006-06-26 02:48:02 +02003140/*
3141 * Local variables:
3142 * c-indent-level: 8
3143 * c-basic-offset: 8
3144 * End:
3145 */