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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 Tarreau4c7e4b72020-05-27 12:58:42 +020022#include <haproxy/api.h>
Willy Tarreau8d366972020-05-27 16:10:29 +020023#include <haproxy/hash.h>
Willy Tarreaucd72d8c2020-06-02 19:11:26 +020024#include <haproxy/http.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020025#include <haproxy/htx.h>
Willy Tarreauc2f7c582020-06-02 18:15:32 +020026#include <haproxy/ticks.h>
Willy Tarreau92b4f132020-06-01 11:05:15 +020027#include <haproxy/time.h>
Willy Tarreau7a00efb2020-06-02 17:02:59 +020028#include <haproxy/namespace.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020029
Willy Tarreaubaaee002006-06-26 02:48:02 +020030#include <types/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020031
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +010032#include <proto/acl.h>
Willy Tarreau34db1082012-04-19 17:16:54 +020033#include <proto/arg.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020034#include <proto/backend.h>
Willy Tarreauc7e42382012-08-24 19:22:53 +020035#include <proto/channel.h>
Willy Tarreau3a9312a2020-01-09 18:43:15 +010036#include <proto/checks.h>
Willy Tarreau03fa5df2010-05-24 21:02:37 +020037#include <proto/frontend.h>
Christopher Fauletf7679ad2019-02-04 12:02:18 +010038#include <proto/http_htx.h>
Willy Tarreau6b2e11b2009-10-01 07:52:15 +020039#include <proto/lb_chash.h>
Willy Tarreauf09c6602012-02-13 17:12:08 +010040#include <proto/lb_fas.h>
Willy Tarreauf89c1872009-10-01 11:19:37 +020041#include <proto/lb_fwlc.h>
42#include <proto/lb_fwrr.h>
43#include <proto/lb_map.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020044#include <proto/log.h>
Willy Tarreau53a47662017-08-28 10:53:00 +020045#include <proto/mux_pt.h>
Willy Tarreau3fdb3662012-11-12 00:42:33 +010046#include <proto/obj_type.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010047#include <proto/payload.h>
Willy Tarreaud1d54542012-09-12 22:58:11 +020048#include <proto/protocol.h>
Christopher Fauletfc9cfe42019-07-16 14:54:53 +020049#include <proto/http_ana.h>
Willy Tarreaua8f55d52010-05-31 17:44:19 +020050#include <proto/proto_tcp.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020051#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020052#include <proto/queue.h>
Willy Tarreaud4c33c82013-01-07 21:59:07 +010053#include <proto/sample.h>
Willy Tarreau7f062c42009-03-05 18:43:00 +010054#include <proto/server.h>
Olivier Houchard00cf70f2018-11-30 17:24:55 +010055#include <proto/session.h>
Willy Tarreau87b09662015-04-03 00:22:06 +020056#include <proto/stream.h>
Willy Tarreau9e000c62011-03-10 14:03:36 +010057#include <proto/stream_interface.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020058#include <proto/ssl_sock.h>
Willy Tarreauc125cef2019-05-10 09:58:43 +020059#include <proto/task.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020060
Christopher Fauleteea8fc72019-11-05 16:18:10 +010061#define TRACE_SOURCE &trace_strm
62
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050063int be_lastsession(const struct proxy *be)
64{
65 if (be->be_counters.last_sess)
66 return now.tv_sec - be->be_counters.last_sess;
67
68 return -1;
69}
70
Bhaskar98634f02013-10-29 23:30:51 -040071/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070072static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040073{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070074 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040075
76 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
77 case BE_LB_HFCN_DJB2:
78 hash = hash_djb2(key, len);
79 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010080 case BE_LB_HFCN_WT6:
81 hash = hash_wt6(key, len);
82 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010083 case BE_LB_HFCN_CRC32:
84 hash = hash_crc32(key, len);
85 break;
Bhaskar98634f02013-10-29 23:30:51 -040086 case BE_LB_HFCN_SDBM:
87 /* this is the default hash function */
88 default:
89 hash = hash_sdbm(key, len);
90 break;
91 }
92
93 return hash;
94}
95
Willy Tarreaubaaee002006-06-26 02:48:02 +020096/*
97 * This function recounts the number of usable active and backup servers for
98 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010099 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +0100100 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +0100101 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200102 * This functions is designed to be called before server's weight and state
103 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200104 *
105 * threads: this is the caller responsibility to lock data. For now, this
106 * function is called from lb modules, so it should be ok. But if you need to
107 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200108 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200109void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200110{
111 struct server *srv;
112
Willy Tarreau20697042007-11-15 23:26:18 +0100113 px->srv_act = px->srv_bck = 0;
114 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100115 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200116 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200117 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100118 continue;
119
Willy Tarreauc93cd162014-05-13 15:54:22 +0200120 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100121 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100122 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100123 px->lbprm.fbck = srv;
124 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400125 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200126 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100127 } else {
128 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400129 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200130 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200131 }
132 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100133}
Willy Tarreau20697042007-11-15 23:26:18 +0100134
Willy Tarreaub625a082007-11-26 01:15:43 +0100135/* This function simply updates the backend's tot_weight and tot_used values
136 * after servers weights have been updated. It is designed to be used after
137 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200138 *
139 * threads: this is the caller responsibility to lock data. For now, this
140 * function is called from lb modules, so it should be ok. But if you need to
141 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100142 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200143void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100144{
Willy Tarreau20697042007-11-15 23:26:18 +0100145 if (px->srv_act) {
146 px->lbprm.tot_weight = px->lbprm.tot_wact;
147 px->lbprm.tot_used = px->srv_act;
148 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100149 else if (px->lbprm.fbck) {
150 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200151 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100152 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100153 }
154 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100155 px->lbprm.tot_weight = px->lbprm.tot_wbck;
156 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100157 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100158}
159
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200160/*
161 * This function tries to find a running server for the proxy <px> following
162 * the source hash method. Depending on the number of active/backup servers,
163 * it will either look for active servers, or for backup servers.
164 * If any server is found, it will be returned. If no valid server is found,
165 * NULL is returned.
166 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100167static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200168{
169 unsigned int h, l;
170
171 if (px->lbprm.tot_weight == 0)
172 return NULL;
173
174 l = h = 0;
175
176 /* note: we won't hash if there's only one server left */
177 if (px->lbprm.tot_used == 1)
178 goto hash_done;
179
180 while ((l + sizeof (int)) <= len) {
181 h ^= ntohl(*(unsigned int *)(&addr[l]));
182 l += sizeof (int);
183 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500184 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100185 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200186 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100187 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100188 return chash_get_server_hash(px, h, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200189 else
190 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200191}
192
193/*
194 * This function tries to find a running server for the proxy <px> following
195 * the URI hash method. In order to optimize cache hits, the hash computation
196 * ends at the question mark. Depending on the number of active/backup servers,
197 * it will either look for active servers, or for backup servers.
198 * If any server is found, it will be returned. If no valid server is found,
Willy Tarreaua9a72492019-01-14 16:14:15 +0100199 * NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
200 * the "whole" optional argument (boolean), the "len" argument (numeric) and
201 * the "depth" argument (numeric).
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200202 *
203 * This code was contributed by Guillaume Dallaire, who also selected this hash
204 * algorithm out of a tens because it gave him the best results.
205 *
206 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100207static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200208{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700209 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200210 int c;
211 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400212 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200213
214 if (px->lbprm.tot_weight == 0)
215 return NULL;
216
217 /* note: we won't hash if there's only one server left */
218 if (px->lbprm.tot_used == 1)
219 goto hash_done;
220
Willy Tarreaua9a72492019-01-14 16:14:15 +0100221 if (px->lbprm.arg_opt2) // "len"
222 uri_len = MIN(uri_len, px->lbprm.arg_opt2);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200223
Bhaskar98634f02013-10-29 23:30:51 -0400224 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200225 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200226 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200227 if (c == '/') {
228 slashes++;
Willy Tarreaua9a72492019-01-14 16:14:15 +0100229 if (slashes == px->lbprm.arg_opt3) /* depth+1 */
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200230 break;
231 }
Willy Tarreaua9a72492019-01-14 16:14:15 +0100232 else if (c == '?' && !px->lbprm.arg_opt1) // "whole"
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200233 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200234 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200235 }
Bhaskar98634f02013-10-29 23:30:51 -0400236
237 hash = gen_hash(px, start, (end - start));
238
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500239 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100240 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200241 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100242 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100243 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200244 else
245 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200246}
247
Christopher Faulet5b517552017-06-09 14:17:53 +0200248/*
Willy Tarreau01732802007-11-01 22:48:15 +0100249 * This function tries to find a running server for the proxy <px> following
250 * the URL parameter hash method. It looks for a specific parameter in the
251 * URL and hashes it to compute the server ID. This is useful to optimize
252 * performance by avoiding bounces between servers in contexts where sessions
253 * are shared but cookies are not usable. If the parameter is not found, NULL
254 * is returned. If any server is found, it will be returned. If no valid server
255 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100256 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100257static 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 +0100258{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700259 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400260 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200261 const char *p;
262 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100263 int plen;
264
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200265 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100266 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100267 return NULL;
268
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200269 if ((p = memchr(uri, '?', uri_len)) == NULL)
270 return NULL;
271
Willy Tarreau01732802007-11-01 22:48:15 +0100272 p++;
273
274 uri_len -= (p - uri);
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100275 plen = px->lbprm.arg_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200276 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100277
278 while (uri_len > plen) {
279 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200280 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100281 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200282 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100283 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200284 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100285 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200286 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400287 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200288 uri_len -= plen + 1;
289
Bhaskar98634f02013-10-29 23:30:51 -0400290 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100291 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400292 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100293 }
Bhaskar98634f02013-10-29 23:30:51 -0400294 hash = gen_hash(px, start, (end - start));
295
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500296 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100297 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400298
Willy Tarreau6c30be52019-01-14 17:07:39 +0100299 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100300 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200301 else
302 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100303 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200304 }
305 /* skip to next parameter */
306 p = memchr(params, '&', uri_len);
307 if (!p)
308 return NULL;
309 p++;
310 uri_len -= (p - params);
311 params = p;
312 }
313 return NULL;
314}
315
316/*
317 * this does the same as the previous server_ph, but check the body contents
318 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100319static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200320{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700321 unsigned int hash = 0;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100322 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200323 struct proxy *px = s->be;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200324 struct htx *htx = htxbuf(&req->buf);
325 struct htx_blk *blk;
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100326 unsigned int plen = px->lbprm.arg_len;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100327 unsigned long len;
328 const char *params, *p, *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200329
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100330 if (px->lbprm.tot_weight == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200331 return NULL;
332
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200333 p = params = NULL;
334 len = 0;
335 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
336 enum htx_blk_type type = htx_get_blk_type(blk);
337 struct ist v;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200338
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200339 if (type != HTX_BLK_DATA)
340 continue;
341 v = htx_get_blk_value(htx, blk);
342 p = params = v.ptr;
343 len = v.len;
344 break;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100345 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200346
347 while (len > plen) {
348 /* Look for the parameter name followed by an equal symbol */
349 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100350 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200351 /* OK, we have the parameter here at <params>, and
352 * the value after the equal sign, at <p>
353 * skip the equal symbol
354 */
355 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400356 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200357 len -= plen + 1;
358
Bhaskar98634f02013-10-29 23:30:51 -0400359 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200360 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100361 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400362 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100363 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200364 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
365 break;
366 return NULL; /* oh, no; this is not uri-encoded.
367 * This body does not contain parameters.
368 */
369 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200370 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400371 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200372 /* should we break if vlen exceeds limit? */
373 }
Bhaskar98634f02013-10-29 23:30:51 -0400374 hash = gen_hash(px, start, (end - start));
375
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500376 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100377 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400378
Willy Tarreau6c30be52019-01-14 17:07:39 +0100379 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100380 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200381 else
382 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200383 }
384 }
Willy Tarreau01732802007-11-01 22:48:15 +0100385 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200386 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100387 if (!p)
388 return NULL;
389 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200390 len -= (p - params);
391 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100392 }
393 return NULL;
394}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200395
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200396
Willy Tarreaubaaee002006-06-26 02:48:02 +0200397/*
Benoitaffb4812009-03-25 13:02:10 +0100398 * This function tries to find a running server for the proxy <px> following
399 * the Header parameter hash method. It looks for a specific parameter in the
400 * URL and hashes it to compute the server ID. This is useful to optimize
401 * performance by avoiding bounces between servers in contexts where sessions
402 * are shared but cookies are not usable. If the parameter is not found, NULL
403 * is returned. If any server is found, it will be returned. If no valid server
Willy Tarreau9fed8582019-01-14 16:04:54 +0100404 * is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
405 * apply to the middle part of a domain name ("use_domain_only" option).
Benoitaffb4812009-03-25 13:02:10 +0100406 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100407static struct server *get_server_hh(struct stream *s, const struct server *avoid)
Benoitaffb4812009-03-25 13:02:10 +0100408{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700409 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100410 struct proxy *px = s->be;
Willy Tarreau484ff072019-01-14 15:28:53 +0100411 unsigned int plen = px->lbprm.arg_len;
Benoitaffb4812009-03-25 13:02:10 +0100412 unsigned long len;
Benoitaffb4812009-03-25 13:02:10 +0100413 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400414 const char *start, *end;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200415 struct htx *htx = htxbuf(&s->req.buf);
416 struct http_hdr_ctx ctx = { .blk = NULL };
Benoitaffb4812009-03-25 13:02:10 +0100417
418 /* tot_weight appears to mean srv_count */
419 if (px->lbprm.tot_weight == 0)
420 return NULL;
421
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200422 /* note: we won't hash if there's only one server left */
423 if (px->lbprm.tot_used == 1)
424 goto hash_done;
425
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200426 http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100427
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200428 /* if the header is not found or empty, let's fallback to round robin */
429 if (!ctx.blk || !ctx.value.len)
430 return NULL;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100431
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200432 /* Found a the param_name in the headers.
433 * we will compute the hash based on this value ctx.val.
434 */
435 len = ctx.value.len;
436 p = ctx.value.ptr;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100437
Willy Tarreau9fed8582019-01-14 16:04:54 +0100438 if (!px->lbprm.arg_opt1) {
Bhaskar98634f02013-10-29 23:30:51 -0400439 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100440 } else {
441 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100442 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100443 /* special computation, use only main domain name, not tld/host
444 * going back from the end of string, start hashing at first
445 * dot stop at next.
446 * This is designed to work with the 'Host' header, and requires
447 * a special option to activate this.
448 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100449 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100450 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100451 if (dohash) {
452 /* Rewind the pointer until the previous char
453 * is a dot, this will allow to set the start
454 * position of the domain. */
455 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100456 break;
Benoitaffb4812009-03-25 13:02:10 +0100457 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100458 else if (*p == '.') {
459 /* The pointer is rewinded to the dot before the
460 * tld, we memorize the end of the domain and
461 * can enter the domain processing. */
462 end = p;
463 dohash = 1;
464 }
Benoitaffb4812009-03-25 13:02:10 +0100465 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100466 len--;
Benoitaffb4812009-03-25 13:02:10 +0100467 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100468 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400469 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100470 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500471 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100472 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200473 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100474 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100475 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200476 else
477 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100478}
479
Willy Tarreau34db1082012-04-19 17:16:54 +0200480/* RDP Cookie HASH. */
Willy Tarreau59884a62019-01-02 14:48:31 +0100481static struct server *get_server_rch(struct stream *s, const struct server *avoid)
Emeric Brun736aa232009-06-30 17:56:00 +0200482{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700483 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200484 struct proxy *px = s->be;
485 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200486 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200487 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200488 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200489
490 /* tot_weight appears to mean srv_count */
491 if (px->lbprm.tot_weight == 0)
492 return NULL;
493
Willy Tarreau37406352012-04-23 16:16:37 +0200494 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200495
Willy Tarreau6a445eb2018-06-19 07:04:45 +0200496 rewind = co_data(&s->req);
497 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200498
Willy Tarreau484ff072019-01-14 15:28:53 +0100499 ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200500 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100501
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200502 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200503
Willy Tarreau37406352012-04-23 16:16:37 +0200504 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200505 return NULL;
506
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200507 /* note: we won't hash if there's only one server left */
508 if (px->lbprm.tot_used == 1)
509 goto hash_done;
510
Willy Tarreau484ff072019-01-14 15:28:53 +0100511 /* Found the param_name in the headers.
Emeric Brun736aa232009-06-30 17:56:00 +0200512 * we will compute the hash based on this value ctx.val.
513 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200514 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400515
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500516 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100517 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200518 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100519 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100520 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200521 else
522 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200523}
Christopher Faulet5b517552017-06-09 14:17:53 +0200524
Willy Tarreau760e81d2018-05-03 07:20:40 +0200525/* random value */
Willy Tarreau59884a62019-01-02 14:48:31 +0100526static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
Willy Tarreau760e81d2018-05-03 07:20:40 +0200527{
528 unsigned int hash = 0;
529 struct proxy *px = s->be;
Willy Tarreau21c741a2019-01-14 18:14:27 +0100530 struct server *prev, *curr;
531 int draws = px->lbprm.arg_opt1; // number of draws
Willy Tarreau760e81d2018-05-03 07:20:40 +0200532
533 /* tot_weight appears to mean srv_count */
534 if (px->lbprm.tot_weight == 0)
535 return NULL;
536
Willy Tarreau21c741a2019-01-14 18:14:27 +0100537 curr = NULL;
538 do {
539 prev = curr;
Willy Tarreaub9f54c52020-03-08 17:31:39 +0100540 hash = ha_random32();
Willy Tarreau21c741a2019-01-14 18:14:27 +0100541 curr = chash_get_server_hash(px, hash, avoid);
542 if (!curr)
543 break;
544
545 /* compare the new server to the previous best choice and pick
546 * the one with the least currently served requests.
547 */
548 if (prev && prev != curr &&
549 curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
550 curr = prev;
551 } while (--draws > 0);
552
553 return curr;
Willy Tarreau760e81d2018-05-03 07:20:40 +0200554}
555
Benoitaffb4812009-03-25 13:02:10 +0100556/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200557 * This function applies the load-balancing algorithm to the stream, as
558 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200559 * 'assigned'.
560 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200561 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200562 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100563 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200564 * The function tries to keep the original connection slot if it reconnects to
565 * the same server, otherwise it releases it and tries to offer it.
566 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200567 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200568 *
569 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100570 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200571 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
572 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200573 * SRV_STATUS_INTERNAL for other unrecoverable errors.
574 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200575 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100576 * it does not need to be called anymore. This means that target_srv(&s->target)
577 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200578 *
579 */
580
Willy Tarreau87b09662015-04-03 00:22:06 +0200581int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200582{
Olivier Houchardba4fff52018-12-01 14:40:40 +0100583 struct connection *conn = NULL;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200584 struct server *conn_slot;
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100585 struct server *srv = NULL, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200586 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100587
Simon Horman8effd3d2011-08-13 08:03:52 +0900588 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200589
Willy Tarreau7c669d72008-06-20 15:04:11 +0200590 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200591 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200592 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100593
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100594 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200595 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200596
Willy Tarreau7c669d72008-06-20 15:04:11 +0200597 /* We have to release any connection slot before applying any LB algo,
598 * otherwise we may erroneously end up with no available slot.
599 */
600 if (conn_slot)
601 sess_change_server(s, NULL);
602
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100603 /* We will now try to find the good server and store it into <objt_server(s->target)>.
604 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200605 * as well as if no server is available (check error code).
606 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100607
Willy Tarreau827aee92011-03-10 16:55:02 +0100608 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100609 s->target = NULL;
Willy Tarreau664beb82011-03-10 11:38:29 +0100610
Olivier Houchardba4fff52018-12-01 14:40:40 +0100611 if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200612 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100613 (s->be->options & PR_O_PREF_LAST))) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100614 struct sess_srv_list *srv_list;
615 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
616 struct server *tmpsrv = objt_server(srv_list->target);
Olivier Houchardba4fff52018-12-01 14:40:40 +0100617
618 if (tmpsrv && tmpsrv->proxy == s->be &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200619 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100620 (!s->be->max_ka_queue ||
621 server_has_room(tmpsrv) || (
622 tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
623 srv_currently_usable(tmpsrv)) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100624 list_for_each_entry(conn, &srv_list->conn_list, session_list) {
Willy Tarreau911db9b2020-01-23 16:27:54 +0100625 if (!(conn->flags & CO_FL_WAIT_XPRT)) {
Olivier Houchardba4fff52018-12-01 14:40:40 +0100626 srv = tmpsrv;
627 s->target = &srv->obj_type;
628 goto out_ok;
629 }
630 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100631 }
632 }
Willy Tarreau9420b122013-12-15 18:58:25 +0100633 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100634 if (s->be->lbprm.algo & BE_LB_KIND) {
Christopher Faulet5b517552017-06-09 14:17:53 +0200635
Willy Tarreau7c669d72008-06-20 15:04:11 +0200636 /* we must check if we have at least one server available */
637 if (!s->be->lbprm.tot_weight) {
638 err = SRV_STATUS_NOSRV;
639 goto out;
640 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200641
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200642 /* First check whether we need to fetch some data or simply call
643 * the LB lookup function. Only the hashing functions will need
644 * some input data in fact, and will support multiple algorithms.
645 */
646 switch (s->be->lbprm.algo & BE_LB_LKUP) {
647 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100648 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200649 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200650
Willy Tarreauf09c6602012-02-13 17:12:08 +0100651 case BE_LB_LKUP_FSTREE:
652 srv = fas_get_next_server(s->be, prev_srv);
653 break;
654
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200655 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100656 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200657 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200658
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200659 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200660 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200661 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200662 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
Willy Tarreau59884a62019-01-02 14:48:31 +0100663 srv = get_server_rnd(s, prev_srv);
Willy Tarreau6c30be52019-01-14 17:07:39 +0100664 else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100665 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200666 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100667 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200668 break;
669 }
670 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200671 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200672 err = SRV_STATUS_INTERNAL;
673 goto out;
674 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200675
676 switch (s->be->lbprm.algo & BE_LB_PARM) {
677 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200678 conn = objt_conn(strm_orig(s));
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200679 if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200680 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200681 (void *)&((struct sockaddr_in *)conn->src)->sin_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100682 4, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200683 }
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200684 else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200685 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200686 (void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100687 16, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200688 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200689 else {
690 /* unknown IP family */
691 err = SRV_STATUS_INTERNAL;
692 goto out;
693 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200694 break;
695
696 case BE_LB_HASH_URI:
697 /* URI hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200698 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100699 struct ist uri;
700
Christopher Faulet297fbb42019-05-13 14:41:27 +0200701 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100702 srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
703 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200704 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200705
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200706 case BE_LB_HASH_PRM:
707 /* URL Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200708 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100709 struct ist uri;
710
Christopher Faulet297fbb42019-05-13 14:41:27 +0200711 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100712 srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100713
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200714 if (!srv && s->txn->meth == HTTP_METH_POST)
715 srv = get_server_ph_post(s, prev_srv);
716 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200717 break;
Benoitaffb4812009-03-25 13:02:10 +0100718
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200719 case BE_LB_HASH_HDR:
720 /* Header Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200721 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
722 srv = get_server_hh(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200723 break;
724
725 case BE_LB_HASH_RDP:
726 /* RDP Cookie hashing */
Willy Tarreau59884a62019-01-02 14:48:31 +0100727 srv = get_server_rch(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200728 break;
729
730 default:
731 /* unknown balancing algorithm */
732 err = SRV_STATUS_INTERNAL;
733 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100734 }
Emeric Brun736aa232009-06-30 17:56:00 +0200735
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200736 /* If the hashing parameter was not found, let's fall
737 * back to round robin on the map.
738 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100739 if (!srv) {
Willy Tarreau6c30be52019-01-14 17:07:39 +0100740 if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100741 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200742 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100743 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200744 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200745
746 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200747 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200748
Willy Tarreau7c669d72008-06-20 15:04:11 +0200749 default:
750 /* unknown balancing algorithm */
751 err = SRV_STATUS_INTERNAL;
752 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200753 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200754
Willy Tarreau827aee92011-03-10 16:55:02 +0100755 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200756 err = SRV_STATUS_FULL;
757 goto out;
758 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100759 else if (srv != prev_srv) {
Olivier Houchard237f7812019-03-08 18:49:07 +0100760 _HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
761 _HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100762 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100763 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200764 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200765 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100766 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200767 }
Olivier Houchard2442f682018-12-01 17:03:38 +0100768 else if ((s->be->options & PR_O_HTTP_PROXY)) {
769 conn = cs_conn(objt_cs(s->si[1].end));
770
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200771 if (conn && conn->dst && is_addr(conn->dst)) {
Olivier Houchard2442f682018-12-01 17:03:38 +0100772 /* in proxy mode, we need a valid destination address */
773 s->target = &s->be->obj_type;
774 } else {
775 err = SRV_STATUS_NOSRV;
776 goto out;
777 }
Willy Tarreau664beb82011-03-10 11:38:29 +0100778 }
779 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200780 err = SRV_STATUS_NOSRV;
781 goto out;
782 }
783
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100784out_ok:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200785 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200786 err = SRV_STATUS_OK;
787 out:
788
789 /* Either we take back our connection slot, or we offer it to someone
790 * else if we don't need it anymore.
791 */
792 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100793 if (conn_slot == srv) {
794 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200795 } else {
796 if (may_dequeue_tasks(conn_slot, s->be))
797 process_srv_queue(conn_slot);
798 }
799 }
800
801 out_err:
802 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200803}
804
Willy Tarreaubaaee002006-06-26 02:48:02 +0200805/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200806 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200807 * The address is taken from the currently assigned server, or from the
808 * dispatch or transparent address.
809 *
810 * It may return :
811 * SRV_STATUS_OK if everything is OK.
812 * SRV_STATUS_INTERNAL for other unrecoverable errors.
813 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200814 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200815 * not cleared, so it's to the caller to clear it if required.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200816 */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200817int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200818{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200819 struct connection *cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200820
Christopher Faulet56803b12017-11-24 16:06:18 +0100821 DPRINTF(stderr,"assign_server_address : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200822
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200823 if (!sockaddr_alloc(&s->target_addr))
Willy Tarreauca79f592019-07-17 19:04:47 +0200824 return SRV_STATUS_INTERNAL;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200825
Willy Tarreaue7dff022015-04-03 01:14:29 +0200826 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200827 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200828 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200829 return SRV_STATUS_INTERNAL;
830
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200831 *s->target_addr = __objt_server(s->target)->addr;
832 set_host_port(s->target_addr, __objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200833
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200834 if (!is_addr(s->target_addr) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200835 /* if the server has no address, we use the same address
836 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200837 * locally on multiple addresses at once. Nothing is done
838 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200839 */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200840 if (!conn_get_dst(cli_conn)) {
841 /* do nothing if we can't retrieve the address */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200842 } else if (cli_conn->dst->ss_family == AF_INET) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200843 ((struct sockaddr_in *)s->target_addr)->sin_addr = ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200844 } else if (cli_conn->dst->ss_family == AF_INET6) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200845 ((struct sockaddr_in6 *)s->target_addr)->sin6_addr = ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200846 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200847 }
848
Willy Tarreaubaaee002006-06-26 02:48:02 +0200849 /* if this server remaps proxied ports, we'll use
850 * the port the client connected to with an offset. */
Willy Tarreau1e582e52018-09-20 11:29:28 +0200851 if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100852 int base_port;
853
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200854 if (conn_get_dst(cli_conn)) {
855 /* First, retrieve the port from the incoming connection */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200856 base_port = get_host_port(cli_conn->dst);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100857
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200858 /* Second, assign the outgoing connection's port */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200859 base_port += get_host_port(s->target_addr);
860 set_host_port(s->target_addr, base_port);
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200861 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200862 }
863 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200864 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200865 /* connect to the defined dispatch addr */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200866 *s->target_addr = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200867 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200868 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200869 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200870 if (conn_get_dst(cli_conn) &&
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200871 (cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200872 *s->target_addr = *cli_conn->dst;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200873 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100874 else if (s->be->options & PR_O_HTTP_PROXY) {
875 /* If HTTP PROXY option is set, then server is already assigned
876 * during incoming client request parsing. */
877 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100878 else {
879 /* no server and no LB algorithm ! */
880 return SRV_STATUS_INTERNAL;
881 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200882
Willy Tarreaue7dff022015-04-03 01:14:29 +0200883 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200884 return SRV_STATUS_OK;
885}
886
Willy Tarreau87b09662015-04-03 00:22:06 +0200887/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200888 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200889 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200890 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200891 * be called before any connection and after any retry or redispatch occurs.
892 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200893 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200894 *
895 * Returns :
896 *
897 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100898 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200899 * SRV_STATUS_QUEUED if the connection has been queued.
900 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100901 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200902 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200903 * SRV_STATUS_INTERNAL for other unrecoverable errors.
904 *
905 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200906int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200907{
908 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100909 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200910 int err;
911
912 if (s->pend_pos)
913 return SRV_STATUS_INTERNAL;
914
Willy Tarreau7c669d72008-06-20 15:04:11 +0200915 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200916 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100917 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100918
Willy Tarreau7c669d72008-06-20 15:04:11 +0200919 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100920 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200921 /* This stream was previously assigned to a server. We have to
922 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200923 * - if the server changed :
924 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200925 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200926 * - increment srv->redispatches and be->redispatches
927 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100928 */
929
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100930 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200931 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
932 s->txn->flags &= ~TX_CK_MASK;
933 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200934 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200935 s->flags |= SF_REDISP;
Olivier Houchard237f7812019-03-08 18:49:07 +0100936 _HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
937 _HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200938 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +0100939 _HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
940 _HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100941 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100942 }
943 }
944
Willy Tarreaubaaee002006-06-26 02:48:02 +0200945 switch (err) {
946 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200947 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100948 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100949 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200950 return SRV_STATUS_OK; /* dispatch or proxy mode */
951
952 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100953 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200954 return SRV_STATUS_OK;
955
Willy Tarreau87b09662015-04-03 00:22:06 +0200956 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200957 * connection slot yet. Either it is a redispatch, or it was
958 * assigned from persistence information (direct mode).
959 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200960 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200961 /* server scheduled for redirection, and already assigned. We
962 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100963 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100964 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100965 return SRV_STATUS_OK;
966 }
967
Willy Tarreau87b09662015-04-03 00:22:06 +0200968 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200969 * We know we have to queue it into the server's queue, so if a maxqueue
970 * is set on the server, we must also check that the server's queue is
971 * not full, in which case we have to return FULL.
972 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100973 if (srv->maxconn &&
974 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200975
Willy Tarreau827aee92011-03-10 16:55:02 +0100976 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200977 return SRV_STATUS_FULL;
978
Willy Tarreaubaaee002006-06-26 02:48:02 +0200979 p = pendconn_add(s);
980 if (p)
981 return SRV_STATUS_QUEUED;
982 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200983 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200984 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200985
986 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100987 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200988 return SRV_STATUS_OK;
989
990 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +0200991 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200992 p = pendconn_add(s);
993 if (p)
994 return SRV_STATUS_QUEUED;
995 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200996 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200997
998 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200999 return err;
1000
Willy Tarreaubaaee002006-06-26 02:48:02 +02001001 case SRV_STATUS_INTERNAL:
1002 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001003
Willy Tarreaubaaee002006-06-26 02:48:02 +02001004 default:
1005 return SRV_STATUS_INTERNAL;
1006 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +01001007}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001008
Willy Tarreaub1d67742010-03-29 19:36:59 +02001009/* If an explicit source binding is specified on the server and/or backend, and
1010 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +02001011 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +01001012 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +02001013 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001014static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +02001015{
Willy Tarreau29fbe512015-08-20 19:35:14 +02001016#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001017 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001018 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001019 struct connection *cli_conn;
Olivier Houchard09a0f032019-01-17 15:59:13 +01001020 struct connection *srv_conn;
1021
1022 if (objt_cs(s->si[1].end))
1023 srv_conn = cs_conn(__objt_cs(s->si[1].end));
1024 else
1025 srv_conn = objt_conn(s->si[1].end);
Willy Tarreau827aee92011-03-10 16:55:02 +01001026
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001027 if (srv && srv->conn_src.opts & CO_SRC_BIND)
1028 src = &srv->conn_src;
1029 else if (s->be->conn_src.opts & CO_SRC_BIND)
1030 src = &s->be->conn_src;
1031 else
1032 return;
Willy Tarreau294c4732011-12-16 21:35:50 +01001033
Willy Tarreauca79f592019-07-17 19:04:47 +02001034 if (!sockaddr_alloc(&srv_conn->src))
1035 return;
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001036
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001037 switch (src->opts & CO_SRC_TPROXY_MASK) {
1038 case CO_SRC_TPROXY_ADDR:
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001039 *srv_conn->src = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001040 break;
1041 case CO_SRC_TPROXY_CLI:
1042 case CO_SRC_TPROXY_CIP:
1043 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001044 cli_conn = objt_conn(strm_orig(s));
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001045 if (cli_conn && conn_get_src(cli_conn))
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001046 *srv_conn->src = *cli_conn->src;
1047 else {
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001048 sockaddr_free(&srv_conn->src);
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001049 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001050 break;
1051 case CO_SRC_TPROXY_DYN:
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001052 if (src->bind_hdr_occ && IS_HTX_STRM(s)) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001053 char *vptr;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001054 size_t vlen;
Willy Tarreau294c4732011-12-16 21:35:50 +01001055
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001056 /* bind to the IP in a header */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001057 ((struct sockaddr_in *)srv_conn->src)->sin_family = AF_INET;
1058 ((struct sockaddr_in *)srv_conn->src)->sin_port = 0;
1059 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr = 0;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001060 if (http_get_htx_hdr(htxbuf(&s->req.buf),
1061 ist2(src->bind_hdr_name, src->bind_hdr_len),
1062 src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001063 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr =
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001064 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001065 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001066 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001067 break;
1068 default:
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001069 sockaddr_free(&srv_conn->src);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001070 }
1071#endif
1072}
1073
Olivier Houchard566df302020-03-06 18:18:56 +01001074/* Attempt to get a backend connection from the specified mt_list array
1075 * (safe or idle connections).
1076 */
1077static struct connection *conn_backend_get(struct server *srv, int is_safe)
1078{
1079 struct mt_list *mt_list = is_safe ? srv->safe_conns : srv->idle_conns;
1080 struct connection *conn;
1081 int i;
1082 int found = 0;
1083
1084 /* We need to lock even if this is our own list, because another
1085 * thread may be trying to migrate that connection, and we don't want
1086 * to end up with two threads using the same connection.
1087 */
1088 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
1089 conn = MT_LIST_POP(&mt_list[tid], struct connection *, list);
1090 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
1091
1092 /* If we found a connection in our own list, and we don't have to
1093 * steal one from another thread, then we're done.
1094 */
Olivier Houchardfdc7ee22020-03-19 23:52:28 +01001095 if (conn) {
1096 i = tid;
1097 goto fix_conn;
1098 }
Olivier Houchard566df302020-03-06 18:18:56 +01001099
1100 /* Lookup all other threads for an idle connection, starting from tid + 1 */
1101 for (i = tid; !found && (i = ((i + 1 == global.nbthread) ? 0 : i + 1)) != tid;) {
1102 struct mt_list *elt1, elt2;
1103
1104 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[i]);
1105 mt_list_for_each_entry_safe(conn, &mt_list[i], list, elt1, elt2) {
1106 if (conn->mux->takeover && conn->mux->takeover(conn) == 0) {
1107 MT_LIST_DEL_SAFE(elt1);
1108 found = 1;
1109 break;
1110 }
1111 }
1112 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[i]);
1113 }
1114
1115 if (!found)
1116 conn = NULL;
1117 else {
Olivier Houchardfdc7ee22020-03-19 23:52:28 +01001118fix_conn:
Olivier Houchard566df302020-03-06 18:18:56 +01001119 conn->idle_time = 0;
1120 _HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
1121 _HA_ATOMIC_SUB(&srv->curr_idle_thr[i], 1);
1122 _HA_ATOMIC_SUB(is_safe ? &srv->curr_safe_nb : &srv->curr_idle_nb, 1);
1123 __ha_barrier_atomic_store();
1124 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&conn->list));
1125 }
1126 return conn;
1127}
1128
Willy Tarreaubaaee002006-06-26 02:48:02 +02001129/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001130 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001131 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001132 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001133 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001134 * - SF_ERR_NONE if everything's OK
1135 * - SF_ERR_SRVTO if there are no more servers
1136 * - SF_ERR_SRVCL if the connection was refused by the server
1137 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1138 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1139 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001140 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001141 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001142 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001143 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001144int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001145{
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001146 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001147 struct connection *srv_conn = NULL;
Olivier Houchard2442f682018-12-01 17:03:38 +01001148 struct conn_stream *srv_cs = NULL;
Willy Tarreaub0821862019-07-18 19:26:11 +02001149 struct sess_srv_list *srv_list;
Willy Tarreau827aee92011-03-10 16:55:02 +01001150 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001151 int reuse = 0;
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001152 int reuse_orphan = 0;
Olivier Houchard5cd62172019-01-04 15:52:26 +01001153 int init_mux = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001154 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001155
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001156
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001157 /* This will catch some corner cases such as lying connections resulting from
1158 * retries or connect timeouts but will rarely trigger.
Olivier Houchard0fa989f2018-12-05 17:08:55 +01001159 */
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001160 si_release_endpoint(&s->si[1]);
1161
Willy Tarreaub0821862019-07-18 19:26:11 +02001162 /* first, search for a matching connection in the session's idle conns */
1163 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
1164 if (srv_list->target == s->target) {
1165 list_for_each_entry(srv_conn, &srv_list->conn_list, session_list) {
1166 if (conn_xprt_ready(srv_conn) &&
1167 srv_conn->mux && (srv_conn->mux->avail_streams(srv_conn) > 0)) {
1168 reuse = 1;
1169 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001170 }
1171 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001172 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001173 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001174 }
Olivier Houchard351411f2018-12-27 17:20:54 +01001175
Olivier Houchard2444aa52020-01-20 13:56:01 +01001176 if (!reuse)
Willy Tarreaub0821862019-07-18 19:26:11 +02001177 srv_conn = NULL;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001178
Willy Tarreau7b004922015-08-04 19:34:21 +02001179 srv = objt_server(s->target);
Willy Tarreau34601a82013-12-15 16:33:46 +01001180
Willy Tarreau8dff9982015-08-04 20:45:52 +02001181 if (srv && !reuse) {
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001182 srv_conn = NULL;
Willy Tarreau8dff9982015-08-04 20:45:52 +02001183
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001184 /* Below we pick connections from the safe, idle or
1185 * available (which are safe too) lists based
Willy Tarreau449d74a2015-08-05 17:16:33 +02001186 * on the strategy, the fact that this is a first or second
1187 * (retryable) request, with the indicated priority (1 or 2) :
1188 *
1189 * SAFE AGGR ALWS
1190 *
1191 * +-----+-----+ +-----+-----+ +-----+-----+
1192 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1193 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1194 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1195 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1196 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1197 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
Willy Tarreaub0821862019-07-18 19:26:11 +02001198 *
1199 * Idle conns are necessarily looked up on the same thread so
1200 * that there is no concurrency issues.
Willy Tarreau449d74a2015-08-05 17:16:33 +02001201 */
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001202 if (srv->available_conns && !LIST_ISEMPTY(&srv->available_conns[tid]) &&
Olivier Houchard566df302020-03-06 18:18:56 +01001203 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR)) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001204 srv_conn = LIST_ELEM(srv->available_conns[tid].n, struct connection *, list);
Olivier Houchard566df302020-03-06 18:18:56 +01001205 reuse = 1;
Willy Tarreau449d74a2015-08-05 17:16:33 +02001206 }
Olivier Houchard566df302020-03-06 18:18:56 +01001207 else if (!srv_conn && srv->curr_idle_conns > 0) {
1208 if (srv->idle_conns &&
1209 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
1210 s->txn && (s->txn->flags & TX_NOT_FIRST)) &&
1211 srv->curr_idle_nb > 0) {
1212 srv_conn = conn_backend_get(srv, 0);
1213 }
1214 else if (srv->safe_conns &&
1215 ((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
1216 (s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR) &&
1217 srv->curr_safe_nb > 0) {
1218 srv_conn = conn_backend_get(srv, 1);
1219 }
1220 else if (srv->idle_conns &&
1221 ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
1222 srv->curr_idle_nb > 0) {
1223 srv_conn = conn_backend_get(srv, 0);
1224 }
1225 /* If we've picked a connection from the pool, we now have to
1226 * detach it. We may have to get rid of the previous idle
1227 * connection we had, so for this we try to swap it with the
1228 * other owner's. That way it may remain alive for others to
1229 * pick.
1230 */
1231 if (srv_conn) {
1232 reuse_orphan = 1;
1233 reuse = 1;
1234 srv_conn->flags &= ~CO_FL_LIST_MASK;
1235 }
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001236 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001237 }
1238
Willy Tarreaub0821862019-07-18 19:26:11 +02001239
1240 /* here reuse might have been set above, indicating srv_conn finally
1241 * is OK.
1242 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001243 if (reuse) {
1244 /* Disable connection reuse if a dynamic source is used.
1245 * As long as we don't share connections between servers,
1246 * we don't need to disable connection reuse on no-idempotent
1247 * requests nor when PROXY protocol is used.
1248 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001249 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1250 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1251 reuse = 0;
1252 }
1253 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1254 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1255 reuse = 0;
1256 }
1257 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001258
Olivier Houchardb3397362020-03-16 13:49:00 +01001259 if (ha_used_fds > global.tune.pool_high_count && srv && srv->idle_conns) {
Olivier Houchard88698d92019-04-16 19:07:22 +02001260 struct connection *tokill_conn;
1261
1262 /* We can't reuse a connection, and e have more FDs than deemd
1263 * acceptable, attempt to kill an idling connection
1264 */
1265 /* First, try from our own idle list */
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001266 tokill_conn = MT_LIST_POP(&srv->idle_conns[tid],
Olivier Houchard88698d92019-04-16 19:07:22 +02001267 struct connection *, list);
1268 if (tokill_conn)
1269 tokill_conn->mux->destroy(tokill_conn->ctx);
1270 /* If not, iterate over other thread's idling pool, and try to grab one */
1271 else {
1272 int i;
1273
1274 for (i = 0; i < global.nbthread; i++) {
1275 if (i == tid)
1276 continue;
Willy Tarreau08e2b412019-05-26 11:50:08 +02001277
1278 // just silence stupid gcc which reports an absurd
1279 // out-of-bounds warning for <i> which is always
1280 // exactly zero without threads, but it seems to
1281 // see it possibly larger.
1282 ALREADY_CHECKED(i);
1283
Olivier Houchard14023742019-12-30 18:15:40 +01001284 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001285 tokill_conn = MT_LIST_POP(&srv->idle_conns[i],
Olivier Houchard88698d92019-04-16 19:07:22 +02001286 struct connection *, list);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001287 if (!tokill_conn)
1288 tokill_conn = MT_LIST_POP(&srv->safe_conns[i],
1289 struct connection *, list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001290 if (tokill_conn) {
1291 /* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
1292
Olivier Houchard859dc802019-08-08 15:47:21 +02001293 MT_LIST_ADDQ(&toremove_connections[i],
1294 (struct mt_list *)&tokill_conn->list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001295 task_wakeup(idle_conn_cleanup[i], TASK_WOKEN_OTHER);
Olivier Houchard849d4f02020-01-31 17:22:08 +01001296 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001297 break;
1298 }
Olivier Houchard14023742019-12-30 18:15:40 +01001299 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001300 }
1301 }
1302
1303 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001304 /* If we're really reusing the connection, remove it from the orphan
1305 * list and add it back to the idle list.
1306 */
Christopher Faulet46451d62019-04-19 15:39:22 +02001307 if (reuse) {
Olivier Houchard566df302020-03-06 18:18:56 +01001308 if (!reuse_orphan) {
Christopher Faulet46451d62019-04-19 15:39:22 +02001309 if (srv_conn->flags & CO_FL_SESS_IDLE) {
1310 struct session *sess = srv_conn->owner;
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001311
Christopher Faulet46451d62019-04-19 15:39:22 +02001312 srv_conn->flags &= ~CO_FL_SESS_IDLE;
1313 sess->idle_conns--;
1314 }
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001315 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001316 }
Willy Tarreau34601a82013-12-15 16:33:46 +01001317
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001318 if (reuse) {
Willy Tarreaub0821862019-07-18 19:26:11 +02001319 if (srv_conn->mux) {
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001320 int avail = srv_conn->mux->avail_streams(srv_conn);
1321
1322 if (avail <= 1) {
Olivier Houchard2442f682018-12-01 17:03:38 +01001323 /* No more streams available, remove it from the list */
Olivier Houchardf0d4dff2020-03-06 18:12:03 +01001324 MT_LIST_DEL(&srv_conn->list);
Olivier Houchard2442f682018-12-01 17:03:38 +01001325 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001326
1327 if (avail >= 1) {
1328 srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001329 if (srv_cs)
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001330 si_attach_cs(&s->si[1], srv_cs);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001331 else
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001332 srv_conn = NULL;
1333 }
Olivier Houchard134a2042018-12-28 14:45:47 +01001334 else
1335 srv_conn = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001336 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001337 /* otherwise srv_conn is left intact */
1338 }
1339 else
1340 srv_conn = NULL;
1341
1342 /* no reuse or failed to reuse the connection above, pick a new one */
1343 if (!srv_conn) {
1344 srv_conn = conn_new();
Willy Tarreau1da41ec2019-02-01 16:38:48 +01001345 if (srv_conn)
1346 srv_conn->target = s->target;
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001347 srv_cs = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001348 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001349
Olivier Houchardcf612a02020-03-25 19:41:03 +01001350 if (srv_conn && srv) {
1351 _HA_ATOMIC_ADD(&srv->curr_used_conns, 1);
1352 /* It's ok not to do that atomically, we don't need an
1353 * exact max.
1354 */
1355 if (srv->max_used_conns < srv->curr_used_conns)
1356 srv->max_used_conns = srv->curr_used_conns;
1357 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001358 if (!srv_conn || !sockaddr_alloc(&srv_conn->dst)) {
1359 if (srv_conn)
1360 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001361 return SF_ERR_RESOURCE;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001362 }
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001363
Willy Tarreaue7dff022015-04-03 01:14:29 +02001364 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001365 err = assign_server_address(s);
Olivier Houchardc0caac22020-03-20 14:26:32 +01001366 if (err != SRV_STATUS_OK) {
1367 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001368 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001369 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001370 }
1371
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001372 /* copy the target address into the connection */
1373 *srv_conn->dst = *s->target_addr;
1374
1375 /* Copy network namespace from client connection */
1376 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
1377
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001378 if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001379 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001380 if (srv)
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001381 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001382 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1383 /* proxies exclusively run on raw_sock right now */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001384 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
Olivier Houchardc0caac22020-03-20 14:26:32 +01001385 if (!(srv_conn->ctrl)) {
1386 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001387 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001388 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001389 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001390 else {
1391 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001392 return SF_ERR_INTERNAL; /* how did we get there ? */
Olivier Houchardc0caac22020-03-20 14:26:32 +01001393 }
Willy Tarreaud02394b2012-05-11 18:32:18 +02001394
Olivier Houchard8af03b32020-01-22 17:34:54 +01001395 srv_cs = si_alloc_cs(&s->si[1], srv_conn);
1396 if (!srv_cs) {
1397 conn_free(srv_conn);
1398 return SF_ERR_RESOURCE;
1399 }
1400 srv_conn->ctx = srv_cs;
Olivier Houchardecffb7d2020-01-24 14:10:55 +01001401#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
Olivier Houchard12950162018-11-23 14:32:08 +01001402 if (!srv ||
1403 ((!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
Olivier Houchardb4a8b2c2019-06-15 00:13:15 +02001404 srv->mux_proto || s->be->mode != PR_MODE_HTTP))
Olivier Houchard201b9f42018-11-21 00:16:29 +01001405#endif
Olivier Houchard5cd62172019-01-04 15:52:26 +01001406 init_mux = 1;
Olivier Houchard68ad53c2020-05-27 01:26:06 +02001407#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
1408 else
1409 srv_conn->owner = s->sess;
1410#endif
Willy Tarreauff605db2013-12-20 11:09:51 +01001411 /* process the case where the server requires the PROXY protocol to be sent */
1412 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001413
Willy Tarreau7b004922015-08-04 19:34:21 +02001414 if (srv && srv->pp_opts) {
Willy Tarreau387ebf82015-08-04 19:24:13 +02001415 srv_conn->flags |= CO_FL_PRIVATE;
Alexander Liu2a54bb72019-05-22 19:44:48 +08001416 srv_conn->flags |= CO_FL_SEND_PROXY;
Willy Tarreauff605db2013-12-20 11:09:51 +01001417 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001418 if (cli_conn)
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001419 conn_get_dst(cli_conn);
Willy Tarreauff605db2013-12-20 11:09:51 +01001420 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001421
Willy Tarreauff605db2013-12-20 11:09:51 +01001422 assign_tproxy_address(s);
Alexander Liu2a54bb72019-05-22 19:44:48 +08001423
1424 if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
1425 srv_conn->send_proxy_ofs = 1;
1426 srv_conn->flags |= CO_FL_SOCKS4;
1427 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001428 }
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001429 else if (!conn_xprt_ready(srv_conn)) {
1430 if (srv_conn->mux->reset)
1431 srv_conn->mux->reset(srv_conn);
1432 }
Olivier Houcharde8f5f5d2019-10-25 17:00:54 +02001433 else {
1434 /* Only consider we're doing reuse if the connection was
1435 * ready.
1436 */
1437 if (srv_conn->mux->ctl(srv_conn, MUX_STATUS, NULL) & MUX_STATUS_READY)
1438 s->flags |= SF_SRV_REUSED;
1439 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001440
William Lallemandb7ff6a32012-03-02 14:35:21 +01001441 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001442 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001443 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001444
Willy Tarreau14f8e862012-08-30 22:23:13 +02001445 /* disable lingering */
1446 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001447 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001448
Willy Tarreauf1573842018-12-14 11:35:36 +01001449 if (s->flags & SF_SRV_REUSED) {
Olivier Houchard237f7812019-03-08 18:49:07 +01001450 _HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001451 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001452 _HA_ATOMIC_ADD(&srv->counters.reuse, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001453 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +01001454 _HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001455 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001456 _HA_ATOMIC_ADD(&srv->counters.connect, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001457 }
1458
Olivier Houchard201b9f42018-11-21 00:16:29 +01001459 err = si_connect(&s->si[1], srv_conn);
Willy Tarreau09e02032019-07-18 16:18:20 +02001460 if (err != SF_ERR_NONE)
1461 return err;
1462
Olivier Houchard5cd62172019-01-04 15:52:26 +01001463 /* We have to defer the mux initialization until after si_connect()
1464 * has been called, as we need the xprt to have been properly
1465 * initialized, or any attempt to recv during the mux init may
1466 * fail, and flag the connection as CO_FL_ERROR.
1467 */
1468 if (init_mux) {
Olivier Houchard74931142019-01-29 19:11:16 +01001469 if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
1470 conn_full_close(srv_conn);
Olivier Houchard5cd62172019-01-04 15:52:26 +01001471 return SF_ERR_INTERNAL;
Olivier Houchard74931142019-01-29 19:11:16 +01001472 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001473 /* If we're doing http-reuse always, and the connection
1474 * is an http2 connection, add it to the available list,
1475 * so that others can use it right away.
1476 */
1477 if (srv && ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
1478 srv_conn->mux->avail_streams(srv_conn) > 0)
Olivier Houchardf0d4dff2020-03-06 18:12:03 +01001479 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&srv_conn->list));
Olivier Houchard5cd62172019-01-04 15:52:26 +01001480 }
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001481 /* The CO_FL_SEND_PROXY flag may have been set by the connect method,
1482 * if so, add our handshake pseudo-XPRT now.
1483 */
Willy Tarreau4450b582020-01-23 15:23:13 +01001484 if ((srv_conn->flags & CO_FL_HANDSHAKE)) {
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001485 if (xprt_add_hs(srv_conn) < 0) {
1486 conn_full_close(srv_conn);
1487 return SF_ERR_INTERNAL;
1488 }
1489 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001490
Willy Tarreaubaaee002006-06-26 02:48:02 +02001491
Willy Tarreau5db847a2019-05-09 14:13:35 +02001492#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
Olivier Houchard4cd2af42019-05-06 15:18:27 +02001493
Olivier Houchard8694e5b2019-06-15 00:14:05 +02001494 if (!reuse && cli_conn && srv && srv_conn->mux &&
Olivier Houchard522eea72017-11-03 16:27:47 +01001495 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
Olivier Houchard865d8392019-05-03 22:46:27 +02001496 /* Only attempt to use early data if either the client sent
1497 * early data, so that we know it can handle a 425, or if
1498 * we are allwoed to retry requests on early data failure, and
1499 * it's our first try
1500 */
1501 ((cli_conn->flags & CO_FL_EARLY_DATA) ||
1502 ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
1503 s->si[1].conn_retries == s->be->conn_retries)) &&
1504 !channel_is_empty(si_oc(&s->si[1])) &&
1505 srv_conn->flags & CO_FL_SSL_WAIT_HS)
Olivier Houchard522eea72017-11-03 16:27:47 +01001506 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001507#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001508
Willy Tarreau14f8e862012-08-30 22:23:13 +02001509 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001510 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001511
Willy Tarreau827aee92011-03-10 16:55:02 +01001512 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001513 int count;
1514
Willy Tarreaue7dff022015-04-03 01:14:29 +02001515 s->flags |= SF_CURR_SESS;
Olivier Houchard237f7812019-03-08 18:49:07 +01001516 count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +02001517 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau51406232008-03-10 22:04:20 +01001518 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001519 s->be->lbprm.server_take_conn(srv);
Willy Tarreau732eac42015-07-09 11:40:25 +02001520
1521#ifdef USE_OPENSSL
1522 if (srv->ssl_ctx.sni) {
1523 struct sample *smp;
Willy Tarreau732eac42015-07-09 11:40:25 +02001524
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001525 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
1526 srv->ssl_ctx.sni, SMP_T_STR);
Willy Tarreau2e0565c2016-08-09 11:55:21 +02001527 if (smp_make_safe(smp)) {
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001528 ssl_sock_set_servername(srv_conn,
1529 smp->data.u.str.area);
Willy Tarreau387ebf82015-08-04 19:24:13 +02001530 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreau732eac42015-07-09 11:40:25 +02001531 }
1532 }
1533#endif /* USE_OPENSSL */
1534
Willy Tarreaubaaee002006-06-26 02:48:02 +02001535 }
1536
Willy Tarreauada4c582020-03-04 16:42:03 +01001537 /* Now handle synchronously connected sockets. We know the stream-int
1538 * is at least in state SI_ST_CON. These ones typically are UNIX
1539 * sockets, socket pairs, and occasionally TCP connections on the
1540 * loopback on a heavily loaded system.
1541 */
1542 if ((srv_conn->flags & CO_FL_ERROR || srv_cs->flags & CS_FL_ERROR))
1543 s->si[1].flags |= SI_FL_ERR;
1544
1545 /* If we had early data, and the handshake ended, then
1546 * we can remove the flag, and attempt to wake the task up,
1547 * in the event there's an analyser waiting for the end of
1548 * the handshake.
1549 */
1550 if (!(srv_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)))
1551 srv_cs->flags &= ~CS_FL_WAIT_FOR_HS;
1552
1553 if (!si_state_in(s->si[1].state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) &&
1554 (srv_conn->flags & CO_FL_WAIT_XPRT) == 0) {
1555 s->si[1].exp = TICK_ETERNITY;
1556 si_oc(&s->si[1])->flags |= CF_WRITE_NULL;
1557 if (s->si[1].state == SI_ST_CON)
1558 s->si[1].state = SI_ST_RDY;
1559 }
1560
1561 /* Report EOI on the channel if it was reached from the mux point of
1562 * view.
1563 *
1564 * Note: This test is only required because si_cs_process is also the SI
1565 * wake callback. Otherwise si_cs_recv()/si_cs_send() already take
1566 * care of it.
1567 */
1568 if ((srv_cs->flags & CS_FL_EOI) && !(si_ic(&s->si[1])->flags & CF_EOI))
1569 si_ic(&s->si[1])->flags |= (CF_EOI|CF_READ_PARTIAL);
1570
Willy Tarreaue7dff022015-04-03 01:14:29 +02001571 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001572}
1573
1574
Willy Tarreaubaaee002006-06-26 02:48:02 +02001575/* This function performs the "redispatch" part of a connection attempt. It
1576 * will assign a server if required, queue the connection if required, and
1577 * handle errors that might arise at this level. It can change the server
1578 * state. It will return 1 if it encounters an error, switches the server
1579 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1580 * that the connection is ready to use.
1581 */
1582
Willy Tarreau87b09662015-04-03 00:22:06 +02001583int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001584{
Willy Tarreau827aee92011-03-10 16:55:02 +01001585 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001586 int conn_err;
1587
1588 /* We know that we don't have any connection pending, so we will
1589 * try to get a new one, and wait in this state if it's queued
1590 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001591 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001592 conn_err = assign_server_and_queue(s);
1593 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001594
Willy Tarreaubaaee002006-06-26 02:48:02 +02001595 switch (conn_err) {
1596 case SRV_STATUS_OK:
1597 break;
1598
Willy Tarreau7c669d72008-06-20 15:04:11 +02001599 case SRV_STATUS_FULL:
1600 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1601 * and we can redispatch to another server, or it is not and we return
1602 * 503. This only makes sense in DIRECT mode however, because normal LB
1603 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001604 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001605 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001606 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001607 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001608 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001609 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001610 sockaddr_free(&s->target_addr);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001611 goto redispatch;
1612 }
1613
Willy Tarreau350f4872014-11-28 14:42:25 +01001614 if (!s->si[1].err_type) {
1615 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001616 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001617
Olivier Houchard237f7812019-03-08 18:49:07 +01001618 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1619 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001620 return 1;
1621
Willy Tarreaubaaee002006-06-26 02:48:02 +02001622 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001623 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001624 if (!s->si[1].err_type) {
1625 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001626 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001627
Olivier Houchard237f7812019-03-08 18:49:07 +01001628 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001629 return 1;
1630
1631 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001632 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1633 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001634 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001635 return 1;
1636
Willy Tarreaubaaee002006-06-26 02:48:02 +02001637 case SRV_STATUS_INTERNAL:
1638 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001639 if (!s->si[1].err_type) {
1640 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001641 }
1642
Willy Tarreau827aee92011-03-10 16:55:02 +01001643 if (srv)
1644 srv_inc_sess_ctr(srv);
1645 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001646 srv_set_sess_last(srv);
1647 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001648 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1649 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001650
Willy Tarreau87b09662015-04-03 00:22:06 +02001651 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001652 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001653 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001654 return 1;
1655 }
1656 /* if we get here, it's because we got SRV_STATUS_OK, which also
1657 * means that the connection has not been queued.
1658 */
1659 return 0;
1660}
1661
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001662/* Check if the connection request is in such a state that it can be aborted. */
1663static int back_may_abort_req(struct channel *req, struct stream *s)
1664{
1665 return ((req->flags & (CF_READ_ERROR)) ||
1666 ((req->flags & (CF_SHUTW_NOW|CF_SHUTW)) && /* empty and client aborted */
1667 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE))));
1668}
1669
1670/* Update back stream interface status for input states SI_ST_ASS, SI_ST_QUE,
1671 * SI_ST_TAR. Other input states are simply ignored.
1672 * Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON
1673 * and SI_ST_EST. Flags must have previously been updated for timeouts and other
1674 * conditions.
1675 */
1676void back_try_conn_req(struct stream *s)
1677{
1678 struct server *srv = objt_server(s->target);
1679 struct stream_interface *si = &s->si[1];
1680 struct channel *req = &s->req;
1681
1682 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1683
1684 if (si->state == SI_ST_ASS) {
1685 /* Server assigned to connection request, we have to try to connect now */
1686 int conn_err;
1687
1688 /* Before we try to initiate the connection, see if the
1689 * request may be aborted instead.
1690 */
1691 if (back_may_abort_req(req, s)) {
1692 si->err_type |= SI_ET_CONN_ABRT;
1693 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1694 goto abort_connection;
1695 }
1696
1697 conn_err = connect_server(s);
1698 srv = objt_server(s->target);
1699
1700 if (conn_err == SF_ERR_NONE) {
1701 /* state = SI_ST_CON or SI_ST_EST now */
1702 if (srv)
1703 srv_inc_sess_ctr(srv);
1704 if (srv)
1705 srv_set_sess_last(srv);
1706 DBG_TRACE_STATE("connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1707 goto end;
1708 }
1709
1710 /* We have received a synchronous error. We might have to
1711 * abort, retry immediately or redispatch.
1712 */
1713 if (conn_err == SF_ERR_INTERNAL) {
1714 if (!si->err_type) {
1715 si->err_type = SI_ET_CONN_OTHER;
1716 }
1717
1718 if (srv)
1719 srv_inc_sess_ctr(srv);
1720 if (srv)
1721 srv_set_sess_last(srv);
1722 if (srv)
1723 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1724 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1725
1726 /* release other streams waiting for this server */
1727 sess_change_server(s, NULL);
1728 if (may_dequeue_tasks(srv, s->be))
1729 process_srv_queue(srv);
1730
1731 /* Failed and not retryable. */
1732 si_shutr(si);
1733 si_shutw(si);
1734 req->flags |= CF_WRITE_ERROR;
1735
1736 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1737
1738 /* we may need to know the position in the queue for logging */
1739 pendconn_cond_unlink(s->pend_pos);
1740
1741 /* no stream was ever accounted for this server */
1742 si->state = SI_ST_CLO;
1743 if (s->srv_error)
1744 s->srv_error(s, si);
1745 DBG_TRACE_STATE("internal error during connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1746 goto end;
1747 }
1748
1749 /* We are facing a retryable error, but we don't want to run a
1750 * turn-around now, as the problem is likely a source port
1751 * allocation problem, so we want to retry now.
1752 */
1753 si->state = SI_ST_CER;
1754 si->flags &= ~SI_FL_ERR;
1755 back_handle_st_cer(s);
1756
1757 DBG_TRACE_STATE("connection error, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1758 /* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
1759 }
1760 else if (si->state == SI_ST_QUE) {
1761 /* connection request was queued, check for any update */
1762 if (!pendconn_dequeue(s)) {
1763 /* The connection is not in the queue anymore. Either
1764 * we have a server connection slot available and we
1765 * go directly to the assigned state, or we need to
1766 * load-balance first and go to the INI state.
1767 */
1768 si->exp = TICK_ETERNITY;
1769 if (unlikely(!(s->flags & SF_ASSIGNED)))
1770 si->state = SI_ST_REQ;
1771 else {
1772 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1773 si->state = SI_ST_ASS;
1774 }
1775 DBG_TRACE_STATE("dequeue connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1776 goto end;
1777 }
1778
1779 /* Connection request still in queue... */
1780 if (si->flags & SI_FL_EXP) {
1781 /* ... and timeout expired */
1782 si->exp = TICK_ETERNITY;
1783 si->flags &= ~SI_FL_EXP;
1784 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1785
1786 /* we may need to know the position in the queue for logging */
1787 pendconn_cond_unlink(s->pend_pos);
1788
1789 if (srv)
1790 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1791 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1792 si_shutr(si);
1793 si_shutw(si);
1794 req->flags |= CF_WRITE_TIMEOUT;
1795 if (!si->err_type)
1796 si->err_type = SI_ET_QUEUE_TO;
1797 si->state = SI_ST_CLO;
1798 if (s->srv_error)
1799 s->srv_error(s, si);
1800 DBG_TRACE_STATE("connection request still queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1801 goto end;
1802 }
1803
1804 /* Connection remains in queue, check if we have to abort it */
1805 if (back_may_abort_req(req, s)) {
1806 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1807
1808 /* we may need to know the position in the queue for logging */
1809 pendconn_cond_unlink(s->pend_pos);
1810
1811 si->err_type |= SI_ET_QUEUE_ABRT;
1812 DBG_TRACE_STATE("abort queued connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1813 goto abort_connection;
1814 }
1815
1816 /* Nothing changed */
1817 }
1818 else if (si->state == SI_ST_TAR) {
1819 /* Connection request might be aborted */
1820 if (back_may_abort_req(req, s)) {
1821 si->err_type |= SI_ET_CONN_ABRT;
1822 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1823 goto abort_connection;
1824 }
1825
1826 if (!(si->flags & SI_FL_EXP))
1827 return; /* still in turn-around */
1828
1829 si->flags &= ~SI_FL_EXP;
1830 si->exp = TICK_ETERNITY;
1831
1832 /* we keep trying on the same server as long as the stream is
1833 * marked "assigned".
1834 * FIXME: Should we force a redispatch attempt when the server is down ?
1835 */
1836 if (s->flags & SF_ASSIGNED)
1837 si->state = SI_ST_ASS;
1838 else
1839 si->state = SI_ST_REQ;
1840
1841 DBG_TRACE_STATE("retry connection now", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1842 }
1843
1844 end:
1845 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1846 return;
1847
1848abort_connection:
1849 /* give up */
1850 si->exp = TICK_ETERNITY;
1851 si->flags &= ~SI_FL_EXP;
1852 si_shutr(si);
1853 si_shutw(si);
1854 si->state = SI_ST_CLO;
1855 if (s->srv_error)
1856 s->srv_error(s, si);
1857 DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1858 return;
1859}
1860
1861/* This function initiates a server connection request on a stream interface
1862 * already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS for
1863 * a real connection to a server, indicating that a server has been assigned,
1864 * or SI_ST_EST for a successful connection to an applet. It may also return
1865 * SI_ST_QUE, or SI_ST_CLO upon error.
1866 */
1867void back_handle_st_req(struct stream *s)
1868{
1869 struct stream_interface *si = &s->si[1];
1870
1871 if (si->state != SI_ST_REQ)
1872 return;
1873
1874 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1875
1876 if (unlikely(obj_type(s->target) == OBJ_TYPE_APPLET)) {
1877 /* the applet directly goes to the EST state */
1878 struct appctx *appctx = objt_appctx(si->end);
1879
1880 if (!appctx || appctx->applet != __objt_applet(s->target))
1881 appctx = si_register_handler(si, objt_applet(s->target));
1882
1883 if (!appctx) {
1884 /* No more memory, let's immediately abort. Force the
1885 * error code to ignore the ERR_LOCAL which is not a
1886 * real error.
1887 */
1888 s->flags &= ~(SF_ERR_MASK | SF_FINST_MASK);
1889
1890 si_shutr(si);
1891 si_shutw(si);
1892 s->req.flags |= CF_WRITE_ERROR;
1893 si->err_type = SI_ET_CONN_RES;
1894 si->state = SI_ST_CLO;
1895 if (s->srv_error)
1896 s->srv_error(s, si);
1897 DBG_TRACE_STATE("failed to register applet", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1898 goto end;
1899 }
1900
1901 if (tv_iszero(&s->logs.tv_request))
1902 s->logs.tv_request = now;
1903 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1904 si->state = SI_ST_EST;
1905 si->err_type = SI_ET_NONE;
1906 be_set_sess_last(s->be);
1907
1908 DBG_TRACE_STATE("applet registered", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1909 /* let back_establish() finish the job */
1910 goto end;
1911 }
1912
1913 /* Try to assign a server */
1914 if (srv_redispatch_connect(s) != 0) {
1915 /* We did not get a server. Either we queued the
1916 * connection request, or we encountered an error.
1917 */
1918 if (si->state == SI_ST_QUE) {
1919 DBG_TRACE_STATE("connection request queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1920 goto end;
1921 }
1922
1923 /* we did not get any server, let's check the cause */
1924 si_shutr(si);
1925 si_shutw(si);
1926 s->req.flags |= CF_WRITE_ERROR;
1927 if (!si->err_type)
1928 si->err_type = SI_ET_CONN_OTHER;
1929 si->state = SI_ST_CLO;
1930 if (s->srv_error)
1931 s->srv_error(s, si);
1932 DBG_TRACE_STATE("connection request failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1933 goto end;
1934 }
1935
1936 /* The server is assigned */
1937 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1938 si->state = SI_ST_ASS;
1939 be_set_sess_last(s->be);
1940 DBG_TRACE_STATE("connection request assigned to a server", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1941
1942 end:
1943 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1944}
1945
1946/* This function is called with (si->state == SI_ST_CON) meaning that a
1947 * connection was attempted and that the file descriptor is already allocated.
1948 * We must check for timeout, error and abort. Possible output states are
1949 * SI_ST_CER (error), SI_ST_DIS (abort), and SI_ST_CON (no change). This only
1950 * works with connection-based streams. We know that there were no I/O event
1951 * when reaching this function. Timeouts and errors are *not* cleared.
1952 */
1953void back_handle_st_con(struct stream *s)
1954{
1955 struct stream_interface *si = &s->si[1];
1956 struct channel *req = &s->req;
1957 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001958
1959 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1960
1961 /* the client might want to abort */
1962 if ((rep->flags & CF_SHUTW) ||
1963 ((req->flags & CF_SHUTW_NOW) &&
1964 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
1965 si->flags |= SI_FL_NOLINGER;
1966 si_shutw(si);
1967 si->err_type |= SI_ET_CONN_ABRT;
1968 if (s->srv_error)
1969 s->srv_error(s, si);
1970 /* Note: state = SI_ST_DIS now */
1971 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 +01001972 goto end;
1973 }
1974
Willy Tarreau062df2c2020-01-10 06:17:03 +01001975 done:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001976 /* retryable error ? */
Willy Tarreau062df2c2020-01-10 06:17:03 +01001977 if (si->flags & (SI_FL_EXP|SI_FL_ERR)) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001978 if (!si->err_type) {
1979 if (si->flags & SI_FL_ERR)
1980 si->err_type = SI_ET_CONN_ERR;
1981 else
1982 si->err_type = SI_ET_CONN_TO;
1983 }
1984
1985 si->state = SI_ST_CER;
1986 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1987 }
1988
Willy Tarreau062df2c2020-01-10 06:17:03 +01001989 end:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001990 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1991}
1992
1993/* This function is called with (si->state == SI_ST_CER) meaning that a
1994 * previous connection attempt has failed and that the file descriptor
1995 * has already been released. Possible causes include asynchronous error
1996 * notification and time out. Possible output states are SI_ST_CLO when
1997 * retries are exhausted, SI_ST_TAR when a delay is wanted before a new
1998 * connection attempt, SI_ST_ASS when it's wise to retry on the same server,
1999 * and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
2000 * marked as in error state. Timeouts and errors are cleared before retrying.
2001 */
2002void back_handle_st_cer(struct stream *s)
2003{
2004 struct stream_interface *si = &s->si[1];
2005 struct conn_stream *cs = objt_cs(si->end);
2006 struct connection *conn = cs_conn(cs);
2007
2008 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2009
2010 si->exp = TICK_ETERNITY;
2011 si->flags &= ~SI_FL_EXP;
2012
2013 /* we probably have to release last stream from the server */
2014 if (objt_server(s->target)) {
2015 health_adjust(objt_server(s->target), HANA_STATUS_L4_ERR);
2016
2017 if (s->flags & SF_CURR_SESS) {
2018 s->flags &= ~SF_CURR_SESS;
2019 _HA_ATOMIC_SUB(&__objt_server(s->target)->cur_sess, 1);
2020 }
2021
2022 if ((si->flags & SI_FL_ERR) &&
2023 conn && conn->err_code == CO_ER_SSL_MISMATCH_SNI) {
2024 /* We tried to connect to a server which is configured
2025 * with "verify required" and which doesn't have the
2026 * "verifyhost" directive. The server presented a wrong
2027 * certificate (a certificate for an unexpected name),
2028 * which implies that we have used SNI in the handshake,
2029 * and that the server doesn't have the associated cert
2030 * and presented a default one.
2031 *
2032 * This is a serious enough issue not to retry. It's
2033 * especially important because this wrong name might
2034 * either be the result of a configuration error, and
2035 * retrying will only hammer the server, or is caused
2036 * by the use of a wrong SNI value, most likely
2037 * provided by the client and we don't want to let the
2038 * client provoke retries.
2039 */
2040 si->conn_retries = 0;
2041 DBG_TRACE_DEVEL("Bad SSL cert, disable connection retries", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2042 }
2043 }
2044
2045 /* ensure that we have enough retries left */
2046 si->conn_retries--;
2047 if (si->conn_retries < 0 || !(s->be->retry_type & PR_RE_CONN_FAILED)) {
2048 if (!si->err_type) {
2049 si->err_type = SI_ET_CONN_ERR;
2050 }
2051
2052 if (objt_server(s->target))
2053 _HA_ATOMIC_ADD(&objt_server(s->target)->counters.failed_conns, 1);
2054 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
2055 sess_change_server(s, NULL);
2056 if (may_dequeue_tasks(objt_server(s->target), s->be))
2057 process_srv_queue(objt_server(s->target));
2058
2059 /* shutw is enough so stop a connecting socket */
2060 si_shutw(si);
2061 s->req.flags |= CF_WRITE_ERROR;
2062 s->res.flags |= CF_READ_ERROR;
2063
2064 si->state = SI_ST_CLO;
2065 if (s->srv_error)
2066 s->srv_error(s, si);
2067
2068 DBG_TRACE_STATE("connection failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2069 goto end;
2070 }
2071
2072 stream_choose_redispatch(s);
2073
2074 if (si->flags & SI_FL_ERR) {
2075 /* The error was an asynchronous connection error, and we will
2076 * likely have to retry connecting to the same server, most
2077 * likely leading to the same result. To avoid this, we wait
2078 * MIN(one second, connect timeout) before retrying. We don't
2079 * do it when the failure happened on a reused connection
2080 * though.
2081 */
2082
2083 int delay = 1000;
2084
2085 if (s->be->timeout.connect && s->be->timeout.connect < delay)
2086 delay = s->be->timeout.connect;
2087
2088 if (!si->err_type)
2089 si->err_type = SI_ET_CONN_ERR;
2090
2091 /* only wait when we're retrying on the same server */
2092 if ((si->state == SI_ST_ASS ||
2093 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_RR ||
2094 (s->be->srv_act <= 1)) && !(s->flags & SF_SRV_REUSED)) {
2095 si->state = SI_ST_TAR;
2096 si->exp = tick_add(now_ms, MS_TO_TICKS(delay));
2097 }
2098 si->flags &= ~SI_FL_ERR;
2099 DBG_TRACE_STATE("retry a new connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2100 }
2101
2102 end:
2103 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2104}
2105
2106/* This function is called with (si->state == SI_ST_RDY) meaning that a
2107 * connection was attempted, that the file descriptor is already allocated,
2108 * and that it has succeeded. We must still check for errors and aborts.
2109 * Possible output states are SI_ST_EST (established), SI_ST_CER (error),
2110 * and SI_ST_DIS (abort). This only works with connection-based streams.
2111 * Timeouts and errors are *not* cleared.
2112 */
2113void back_handle_st_rdy(struct stream *s)
2114{
2115 struct stream_interface *si = &s->si[1];
2116 struct channel *req = &s->req;
2117 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002118
2119 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2120 /* We know the connection at least succeeded, though it could have
2121 * since met an error for any other reason. At least it didn't time out
2122 * eventhough the timeout might have been reported right after success.
2123 * We need to take care of various situations here :
2124 * - everything might be OK. We have to switch to established.
2125 * - an I/O error might have been reported after a successful transfer,
2126 * which is not retryable and needs to be logged correctly, and needs
2127 * established as well
2128 * - SI_ST_CON implies !CF_WROTE_DATA but not conversely as we could
2129 * have validated a connection with incoming data (e.g. TCP with a
2130 * banner protocol), or just a successful connect() probe.
2131 * - the client might have requested a connection abort, this needs to
2132 * be checked before we decide to retry anything.
2133 */
2134
2135 /* it's still possible to handle client aborts or connection retries
2136 * before any data were sent.
2137 */
2138 if (!(req->flags & CF_WROTE_DATA)) {
2139 /* client abort ? */
2140 if ((rep->flags & CF_SHUTW) ||
2141 ((req->flags & CF_SHUTW_NOW) &&
2142 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2143 /* give up */
2144 si->flags |= SI_FL_NOLINGER;
2145 si_shutw(si);
2146 si->err_type |= SI_ET_CONN_ABRT;
2147 if (s->srv_error)
2148 s->srv_error(s, si);
2149 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2150 goto end;
2151 }
2152
2153 /* retryable error ? */
2154 if (si->flags & SI_FL_ERR) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002155 if (!si->err_type)
2156 si->err_type = SI_ET_CONN_ERR;
2157 si->state = SI_ST_CER;
2158 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2159 goto end;
2160 }
2161 }
2162
2163 /* data were sent and/or we had no error, back_establish() will
2164 * now take over.
2165 */
2166 DBG_TRACE_STATE("connection established", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2167 si->err_type = SI_ET_NONE;
2168 si->state = SI_ST_EST;
2169
2170 end:
2171 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2172}
2173
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002174/* sends a log message when a backend goes down, and also sets last
2175 * change date.
2176 */
2177void set_backend_down(struct proxy *be)
2178{
2179 be->last_change = now.tv_sec;
Olivier Houchard237f7812019-03-08 18:49:07 +01002180 _HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002181
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002182 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01002183 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002184 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
2185 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002186}
2187
Willy Tarreau87b09662015-04-03 00:22:06 +02002188/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002189 * tries to extract an RDP cookie from the request buffer, and look for the
2190 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02002191 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002192 * list. Nothing is performed if a server was already assigned.
2193 */
Willy Tarreau87b09662015-04-03 00:22:06 +02002194int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002195{
2196 struct proxy *px = s->be;
2197 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02002198 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002199 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01002200 uint16_t port;
2201 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002202 char *p;
2203
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002204 DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002205
Willy Tarreaue7dff022015-04-03 01:14:29 +02002206 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002207 goto no_cookie;
2208
Willy Tarreau37406352012-04-23 16:16:37 +02002209 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002210
Willy Tarreaucadd8c92013-07-22 18:09:52 +02002211 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002212 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002213 goto no_cookie;
2214
Willy Tarreau04276f32017-01-06 17:41:29 +01002215 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
2216 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
2217 * server's IP address in network order, and "port" is the integer corresponding to the
2218 * server's port in network order. Comments please Emeric.
2219 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002220 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002221 if (*p != '.')
2222 goto no_cookie;
2223 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01002224
2225 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002226 if (*p != '.')
2227 goto no_cookie;
2228
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002229 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002230 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02002231 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01002232 port == srv->svc_port &&
2233 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002234 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002235 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02002236 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002237 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002238 break;
2239 }
2240 }
2241 srv = srv->next;
2242 }
2243
2244no_cookie:
2245 req->analysers &= ~an_bit;
2246 req->analyse_exp = TICK_ETERNITY;
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002247 DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002248 return 1;
2249}
2250
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002251int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01002252 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002253 return px->down_time;
2254
2255 return now.tv_sec - px->last_change + px->down_time;
2256}
Willy Tarreaubaaee002006-06-26 02:48:02 +02002257
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002258/*
2259 * This function returns a string containing the balancing
2260 * mode of the proxy in a format suitable for stats.
2261 */
2262
2263const char *backend_lb_algo_str(int algo) {
2264
2265 if (algo == BE_LB_ALGO_RR)
2266 return "roundrobin";
2267 else if (algo == BE_LB_ALGO_SRR)
2268 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01002269 else if (algo == BE_LB_ALGO_FAS)
2270 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002271 else if (algo == BE_LB_ALGO_LC)
2272 return "leastconn";
2273 else if (algo == BE_LB_ALGO_SH)
2274 return "source";
2275 else if (algo == BE_LB_ALGO_UH)
2276 return "uri";
2277 else if (algo == BE_LB_ALGO_PH)
2278 return "url_param";
2279 else if (algo == BE_LB_ALGO_HH)
2280 return "hdr";
2281 else if (algo == BE_LB_ALGO_RCH)
2282 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002283 else if (algo == BE_LB_ALGO_NONE)
2284 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002285 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002286 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002287}
2288
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002289/* This function parses a "balance" statement in a backend section describing
2290 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002291 * returns -1, it will write an error message into the <err> buffer which will
2292 * automatically be allocated and must be passed as NULL. The trailing '\n'
2293 * will not be written. The function must be called with <args> pointing to the
2294 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002295 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002296int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002297{
2298 if (!*(args[0])) {
2299 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01002300 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2301 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002302 return 0;
2303 }
2304
2305 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002306 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2307 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002308 }
Willy Tarreau9757a382009-10-03 12:56:50 +02002309 else if (!strcmp(args[0], "static-rr")) {
2310 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2311 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
2312 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01002313 else if (!strcmp(args[0], "first")) {
2314 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2315 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
2316 }
Willy Tarreau51406232008-03-10 22:04:20 +01002317 else if (!strcmp(args[0], "leastconn")) {
2318 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2319 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
2320 }
Willy Tarreau21c741a2019-01-14 18:14:27 +01002321 else if (!strncmp(args[0], "random", 6)) {
Willy Tarreau760e81d2018-05-03 07:20:40 +02002322 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2323 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
Willy Tarreau21c741a2019-01-14 18:14:27 +01002324 curproxy->lbprm.arg_opt1 = 2;
2325
2326 if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
2327 const char *beg;
2328 char *end;
2329
2330 beg = args[0] + 7;
2331 curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
2332
2333 if (*end != ')') {
2334 if (!*end)
2335 memprintf(err, "random : missing closing parenthesis.");
2336 else
2337 memprintf(err, "random : unexpected character '%c' after argument.", *end);
2338 return -1;
2339 }
2340
2341 if (curproxy->lbprm.arg_opt1 < 1) {
2342 memprintf(err, "random : number of draws must be at least 1.");
2343 return -1;
2344 }
2345 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02002346 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002347 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002348 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2349 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002350 }
2351 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002352 int arg = 1;
2353
Willy Tarreau31682232007-11-29 15:38:04 +01002354 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2355 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Willy Tarreaua9a72492019-01-14 16:14:15 +01002356 curproxy->lbprm.arg_opt1 = 0; // "whole"
2357 curproxy->lbprm.arg_opt2 = 0; // "len"
2358 curproxy->lbprm.arg_opt3 = 0; // "depth"
Oskar Stolc8dc41842012-05-19 10:19:54 +01002359
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002360 while (*args[arg]) {
2361 if (!strcmp(args[arg], "len")) {
2362 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002363 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002364 return -1;
2365 }
Willy Tarreaua9a72492019-01-14 16:14:15 +01002366 curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002367 arg += 2;
2368 }
2369 else if (!strcmp(args[arg], "depth")) {
2370 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002371 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002372 return -1;
2373 }
2374 /* hint: we store the position of the ending '/' (depth+1) so
2375 * that we avoid a comparison while computing the hash.
2376 */
Willy Tarreaua9a72492019-01-14 16:14:15 +01002377 curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002378 arg += 2;
2379 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01002380 else if (!strcmp(args[arg], "whole")) {
Willy Tarreaua9a72492019-01-14 16:14:15 +01002381 curproxy->lbprm.arg_opt1 = 1;
Oskar Stolc8dc41842012-05-19 10:19:54 +01002382 arg += 1;
2383 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002384 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01002385 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002386 return -1;
2387 }
2388 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002389 }
Willy Tarreau01732802007-11-01 22:48:15 +01002390 else if (!strcmp(args[0], "url_param")) {
2391 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002392 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01002393 return -1;
2394 }
Willy Tarreau31682232007-11-29 15:38:04 +01002395 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2396 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02002397
Willy Tarreau4c03d1c2019-01-14 15:23:54 +01002398 free(curproxy->lbprm.arg_str);
2399 curproxy->lbprm.arg_str = strdup(args[1]);
2400 curproxy->lbprm.arg_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002401 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002402 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002403 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002404 return -1;
2405 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002406 }
Benoitaffb4812009-03-25 13:02:10 +01002407 }
2408 else if (!strncmp(args[0], "hdr(", 4)) {
2409 const char *beg, *end;
2410
2411 beg = args[0] + 4;
2412 end = strchr(beg, ')');
2413
2414 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002415 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01002416 return -1;
2417 }
2418
2419 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2420 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
2421
Willy Tarreau484ff072019-01-14 15:28:53 +01002422 free(curproxy->lbprm.arg_str);
2423 curproxy->lbprm.arg_len = end - beg;
2424 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
Willy Tarreau9fed8582019-01-14 16:04:54 +01002425 curproxy->lbprm.arg_opt1 = 0;
Benoitaffb4812009-03-25 13:02:10 +01002426
2427 if (*args[1]) {
2428 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002429 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01002430 return -1;
2431 }
Willy Tarreau9fed8582019-01-14 16:04:54 +01002432 curproxy->lbprm.arg_opt1 = 1;
Benoitaffb4812009-03-25 13:02:10 +01002433 }
Emeric Brun736aa232009-06-30 17:56:00 +02002434 }
2435 else if (!strncmp(args[0], "rdp-cookie", 10)) {
2436 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2437 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
2438
2439 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
2440 const char *beg, *end;
2441
2442 beg = args[0] + 11;
2443 end = strchr(beg, ')');
2444
2445 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002446 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002447 return -1;
2448 }
2449
Willy Tarreau484ff072019-01-14 15:28:53 +01002450 free(curproxy->lbprm.arg_str);
2451 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
2452 curproxy->lbprm.arg_len = end - beg;
Emeric Brun736aa232009-06-30 17:56:00 +02002453 }
2454 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
Willy Tarreau484ff072019-01-14 15:28:53 +01002455 free(curproxy->lbprm.arg_str);
2456 curproxy->lbprm.arg_str = strdup("mstshash");
2457 curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
Emeric Brun736aa232009-06-30 17:56:00 +02002458 }
2459 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002460 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002461 return -1;
2462 }
Willy Tarreau01732802007-11-01 22:48:15 +01002463 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002464 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002465 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 +01002466 return -1;
2467 }
2468 return 0;
2469}
2470
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002471
2472/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002473/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002474/************************************************************************/
2475
Willy Tarreau34db1082012-04-19 17:16:54 +02002476/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002477 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002478 * undefined behaviour.
2479 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002480static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002481smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002482{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002483 struct proxy *px;
2484
Willy Tarreau37406352012-04-23 16:16:37 +02002485 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002486 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002487 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002488
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002489 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002490
2491 return 1;
2492}
2493
Willy Tarreau37406352012-04-23 16:16:37 +02002494/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002495 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02002496 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2497 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002498 */
2499static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002500smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002501{
Willy Tarreau24e32d82012-04-23 23:55:44 +02002502 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002503
Willy Tarreau37406352012-04-23 16:16:37 +02002504 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002505 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02002506 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
2507 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002508 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002509 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002510 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002511 return 1;
2512}
2513
Willy Tarreau34db1082012-04-19 17:16:54 +02002514/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002515 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002516 * undefined behaviour.
2517 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002518static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002519smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002520{
2521 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02002522
Willy Tarreau37406352012-04-23 16:16:37 +02002523 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002524 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002525 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002526
Willy Tarreau24e32d82012-04-23 23:55:44 +02002527 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002528 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002529 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002530
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002531 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01002532 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002533 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002534 return 1;
2535 }
2536
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002537 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02002538 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002539 }
2540
2541 return 1;
2542}
2543
Willy Tarreaua5e37562011-12-16 17:06:15 +01002544/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002545static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002546smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002547{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002548 struct proxy *px = NULL;
2549
2550 if (smp->strm)
2551 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002552 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002553 px = __objt_check(smp->sess->origin)->proxy;
2554 if (!px)
Willy Tarreaube508f12016-03-10 11:47:01 +01002555 return 0;
2556
Willy Tarreauf853c462012-04-23 18:53:56 +02002557 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002558 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002559 smp->data.u.sint = px->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002560 return 1;
2561}
2562
Marcin Deranekd2471c22016-12-12 14:08:05 +01002563/* set string to the name of the backend */
2564static int
2565smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2566{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002567 struct proxy *px = NULL;
2568
2569 if (smp->strm)
2570 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002571 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002572 px = __objt_check(smp->sess->origin)->proxy;
2573 if (!px)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002574 return 0;
2575
Christopher Fauletd1b44642020-04-30 09:51:15 +02002576 smp->data.u.str.area = (char *)px->id;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002577 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002578 return 0;
2579
2580 smp->data.type = SMP_T_STR;
2581 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002582 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01002583
2584 return 1;
2585}
2586
Willy Tarreaua5e37562011-12-16 17:06:15 +01002587/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002588static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002589smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002590{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002591 struct server *srv = NULL;
Willy Tarreaube508f12016-03-10 11:47:01 +01002592
Christopher Fauletd1b44642020-04-30 09:51:15 +02002593 if (smp->strm)
2594 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002595 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002596 srv = __objt_check(smp->sess->origin)->server;
2597 if (!srv)
Willy Tarreau17af4192011-02-23 14:27:06 +01002598 return 0;
2599
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002600 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002601 smp->data.u.sint = srv->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002602
2603 return 1;
2604}
2605
vkill1dfd1652019-10-30 16:58:14 +08002606/* set string to the name of the server */
2607static int
2608smp_fetch_srv_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2609{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002610 struct server *srv = NULL;
vkill1dfd1652019-10-30 16:58:14 +08002611
Christopher Fauletd1b44642020-04-30 09:51:15 +02002612 if (smp->strm)
2613 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002614 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002615 srv = __objt_check(smp->sess->origin)->server;
2616 if (!srv)
vkill1dfd1652019-10-30 16:58:14 +08002617 return 0;
2618
Christopher Fauletd1b44642020-04-30 09:51:15 +02002619 smp->data.u.str.area = srv->id;
vkill1dfd1652019-10-30 16:58:14 +08002620 if (!smp->data.u.str.area)
2621 return 0;
2622
2623 smp->data.type = SMP_T_STR;
2624 smp->data.u.str.data = strlen(smp->data.u.str.area);
2625
2626 return 1;
2627}
2628
Willy Tarreau34db1082012-04-19 17:16:54 +02002629/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002630 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002631 * undefined behaviour.
2632 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002633static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002634smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002635{
Willy Tarreau37406352012-04-23 16:16:37 +02002636 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002637 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002638 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002639 return 1;
2640}
2641
Willy Tarreau34db1082012-04-19 17:16:54 +02002642/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002643 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002644 * undefined behaviour.
2645 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002646static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002647smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002648{
Willy Tarreau37406352012-04-23 16:16:37 +02002649 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002650 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002651 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02002652 return 1;
2653}
2654
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002655/* set temp integer to the number of available connections across available
2656 * servers on the backend.
2657 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
2658 * undefined behaviour.
2659 */
2660static int
2661smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2662{
2663 struct server *iterator;
2664 struct proxy *px;
2665 unsigned int maxconn;
2666
2667 smp->flags = SMP_F_VOL_TEST;
2668 smp->data.type = SMP_T_SINT;
2669 smp->data.u.sint = 0;
2670
2671 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
2672 if (iterator->cur_state == SRV_ST_STOPPED)
2673 continue;
2674
2675 px = iterator->proxy;
2676 if (!srv_currently_usable(iterator) ||
2677 ((iterator->flags & SRV_F_BACKUP) &&
2678 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
2679 continue;
2680
2681 if (iterator->maxconn == 0) {
2682 /* one active server is unlimited, return -1 */
2683 smp->data.u.sint = -1;
2684 return 1;
2685 }
2686
2687 maxconn = srv_dynamic_maxconn(iterator);
2688 if (maxconn > iterator->cur_sess)
2689 smp->data.u.sint += maxconn - iterator->cur_sess;
2690 }
2691
2692 return 1;
2693}
2694
Willy Tarreau34db1082012-04-19 17:16:54 +02002695/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002696 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002697 * undefined behaviour.
2698 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002699static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002700smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002701{
Willy Tarreau37406352012-04-23 16:16:37 +02002702 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002703 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002704 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02002705 return 1;
2706}
2707
Willy Tarreaua5e37562011-12-16 17:06:15 +01002708/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02002709 * by the number of running servers and rounded up. If there is no running
2710 * server, we return twice the total, just as if we had half a running server.
2711 * This is more or less correct anyway, since we expect the last server to come
2712 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002713 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002714 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02002715 */
2716static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002717smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002718{
2719 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002720 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02002721
Willy Tarreau37406352012-04-23 16:16:37 +02002722 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002723 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002724 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02002725
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002726 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02002727
2728 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002729 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02002730 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002731 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02002732
2733 return 1;
2734}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002735
Willy Tarreau34db1082012-04-19 17:16:54 +02002736/* set temp integer to the number of concurrent connections on the server in the backend.
2737 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2738 * undefined behaviour.
2739 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002740static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002741smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002742{
Willy Tarreauf853c462012-04-23 18:53:56 +02002743 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002744 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002745 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002746 return 1;
2747}
2748
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002749/* set temp integer to the number of available connections on the server in the backend.
2750 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2751 * undefined behaviour.
2752 */
2753static int
2754smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2755{
2756 unsigned int maxconn;
2757
2758 smp->flags = SMP_F_VOL_TEST;
2759 smp->data.type = SMP_T_SINT;
2760
2761 if (args->data.srv->maxconn == 0) {
2762 /* one active server is unlimited, return -1 */
2763 smp->data.u.sint = -1;
2764 return 1;
2765 }
2766
2767 maxconn = srv_dynamic_maxconn(args->data.srv);
2768 if (maxconn > args->data.srv->cur_sess)
2769 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
2770 else
2771 smp->data.u.sint = 0;
2772
2773 return 1;
2774}
2775
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002776/* set temp integer to the number of connections pending in the server's queue.
2777 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2778 * undefined behaviour.
2779 */
2780static int
2781smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
2782{
2783 smp->flags = SMP_F_VOL_TEST;
2784 smp->data.type = SMP_T_SINT;
2785 smp->data.u.sint = args->data.srv->nbpend;
2786 return 1;
2787}
2788
Tait Clarridge7896d522012-12-05 21:39:31 -05002789/* set temp integer to the number of enabled servers on the proxy.
2790 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2791 * undefined behaviour.
2792 */
2793static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002794smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05002795{
2796 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002797 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002798 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05002799 return 1;
2800}
2801
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002802static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
2803{
2804
2805 struct proxy *px;
2806
2807 if (!smp_make_safe(smp))
2808 return 0;
2809
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002810 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002811 if (!px)
2812 return 0;
2813
2814 smp->data.type = SMP_T_SINT;
2815 smp->data.u.sint = be_usable_srv(px);
2816
2817 return 1;
2818}
2819
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002820static int
2821sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
2822{
2823 struct proxy *px;
2824 struct server *srv;
2825 char *bksep;
2826
2827 if (!smp_make_safe(smp))
2828 return 0;
2829
2830 bksep = strchr(smp->data.u.str.area, '/');
2831
2832 if (bksep) {
2833 *bksep = '\0';
2834 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
2835 if (!px)
2836 return 0;
2837 smp->data.u.str.area = bksep + 1;
2838 } else {
2839 if (!(smp->px->cap & PR_CAP_BE))
2840 return 0;
2841 px = smp->px;
2842 }
2843
2844 srv = server_find_by_name(px, smp->data.u.str.area);
2845 if (!srv)
2846 return 0;
2847
2848 smp->data.type = SMP_T_SINT;
2849 smp->data.u.sint = srv->nbpend;
2850 return 1;
2851}
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002852
2853/* Note: must not be declared <const> as its list will be overwritten.
2854 * Please take care of keeping this list alphabetically sorted.
2855 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002856static struct sample_fetch_kw_list smp_kws = {ILH, {
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002857 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2858 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002859 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002860 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
Marcin Deranekd2471c22016-12-12 14:08:05 +01002861 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002862 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2863 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2864 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2865 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2866 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002867 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002868 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002869 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
vkill1dfd1652019-10-30 16:58:14 +08002870 { "srv_name", smp_fetch_srv_name, 0, NULL, SMP_T_STR, SMP_USE_SERVR, },
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002871 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002872 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002873 { /* END */ },
2874}};
2875
Willy Tarreau0108d902018-11-25 19:14:37 +01002876INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
2877
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002878/* Note: must not be declared <const> as its list will be overwritten */
2879static struct sample_conv_kw_list sample_conv_kws = {ILH, {
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002880 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
2881 { "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002882 { /* END */ },
2883}};
2884
Willy Tarreau0108d902018-11-25 19:14:37 +01002885INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002886
Willy Tarreau61612d42012-04-19 18:42:05 +02002887/* Note: must not be declared <const> as its list will be overwritten.
2888 * Please take care of keeping this list alphabetically sorted.
2889 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002890static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002891 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002892}};
2893
Willy Tarreau0108d902018-11-25 19:14:37 +01002894INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002895
Willy Tarreaubaaee002006-06-26 02:48:02 +02002896/*
2897 * Local variables:
2898 * c-indent-level: 8
2899 * c-basic-offset: 8
2900 * End:
2901 */