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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 Tarreaudcc048a2020-06-04 19:11:43 +020022#include <haproxy/acl.h>
Willy Tarreau4c7e4b72020-05-27 12:58:42 +020023#include <haproxy/api.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020024#include <haproxy/arg.h>
25#include <haproxy/backend.h>
Willy Tarreauf1d32c42020-06-04 21:07:02 +020026#include <haproxy/channel.h>
Willy Tarreau4aa573d2020-06-04 18:21:56 +020027#include <haproxy/check.h>
Willy Tarreau762d7a52020-06-04 11:23:07 +020028#include <haproxy/frontend.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020029#include <haproxy/global.h>
Willy Tarreau8d366972020-05-27 16:10:29 +020030#include <haproxy/hash.h>
Willy Tarreaucd72d8c2020-06-02 19:11:26 +020031#include <haproxy/http.h>
Willy Tarreauc2b1ff02020-06-04 21:21:03 +020032#include <haproxy/http_ana.h>
Willy Tarreau87735332020-06-04 09:08:41 +020033#include <haproxy/http_htx.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020034#include <haproxy/htx.h>
Willy Tarreaufbe8da32020-06-04 14:34:27 +020035#include <haproxy/lb_chash.h>
Willy Tarreaub5fc3bf2020-06-04 14:37:38 +020036#include <haproxy/lb_fas.h>
Willy Tarreau02549412020-06-04 14:41:04 +020037#include <haproxy/lb_fwlc.h>
Willy Tarreau546ba422020-06-04 14:45:03 +020038#include <haproxy/lb_fwrr.h>
Willy Tarreau28671592020-06-04 20:22:59 +020039#include <haproxy/lb_map.h>
Willy Tarreauaeed4a82020-06-04 22:01:04 +020040#include <haproxy/log.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020041#include <haproxy/namespace.h>
Willy Tarreau8efbdfb2020-06-04 11:29:21 +020042#include <haproxy/obj_type.h>
Willy Tarreau469509b2020-06-04 15:13:30 +020043#include <haproxy/payload.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020044#include <haproxy/proto_tcp.h>
45#include <haproxy/protocol.h>
Willy Tarreaua264d962020-06-04 22:29:18 +020046#include <haproxy/proxy.h>
Willy Tarreaua55c4542020-06-04 22:59:39 +020047#include <haproxy/queue.h>
Willy Tarreaub2551052020-06-09 09:07:15 +020048#include <haproxy/sample.h>
Willy Tarreau1e56f922020-06-04 23:20:13 +020049#include <haproxy/server.h>
Willy Tarreau48d25b32020-06-04 18:58:52 +020050#include <haproxy/session.h>
Willy Tarreau209108d2020-06-04 20:30:20 +020051#include <haproxy/ssl_sock.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020052#include <haproxy/stream.h>
Willy Tarreau5e539c92020-06-04 20:45:39 +020053#include <haproxy/stream_interface.h>
Willy Tarreaucea0e1b2020-06-04 17:25:40 +020054#include <haproxy/task.h>
Willy Tarreauc2f7c582020-06-02 18:15:32 +020055#include <haproxy/ticks.h>
Willy Tarreau92b4f132020-06-01 11:05:15 +020056#include <haproxy/time.h>
Willy Tarreaudfd3de82020-06-04 23:46:14 +020057#include <haproxy/trace.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020058
Christopher Fauleteea8fc72019-11-05 16:18:10 +010059#define TRACE_SOURCE &trace_strm
60
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050061int be_lastsession(const struct proxy *be)
62{
63 if (be->be_counters.last_sess)
64 return now.tv_sec - be->be_counters.last_sess;
65
66 return -1;
67}
68
Bhaskar98634f02013-10-29 23:30:51 -040069/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070070static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040071{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070072 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040073
74 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
75 case BE_LB_HFCN_DJB2:
76 hash = hash_djb2(key, len);
77 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010078 case BE_LB_HFCN_WT6:
79 hash = hash_wt6(key, len);
80 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010081 case BE_LB_HFCN_CRC32:
82 hash = hash_crc32(key, len);
83 break;
Bhaskar98634f02013-10-29 23:30:51 -040084 case BE_LB_HFCN_SDBM:
85 /* this is the default hash function */
86 default:
87 hash = hash_sdbm(key, len);
88 break;
89 }
90
91 return hash;
92}
93
Willy Tarreaubaaee002006-06-26 02:48:02 +020094/*
95 * This function recounts the number of usable active and backup servers for
96 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010097 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +010098 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +010099 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200100 * This functions is designed to be called before server's weight and state
101 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200102 *
103 * threads: this is the caller responsibility to lock data. For now, this
104 * function is called from lb modules, so it should be ok. But if you need to
105 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200106 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200107void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200108{
109 struct server *srv;
110
Willy Tarreau20697042007-11-15 23:26:18 +0100111 px->srv_act = px->srv_bck = 0;
112 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100113 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200114 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200115 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100116 continue;
117
Willy Tarreauc93cd162014-05-13 15:54:22 +0200118 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100119 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100120 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100121 px->lbprm.fbck = srv;
122 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400123 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200124 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100125 } else {
126 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400127 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200128 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200129 }
130 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100131}
Willy Tarreau20697042007-11-15 23:26:18 +0100132
Willy Tarreaub625a082007-11-26 01:15:43 +0100133/* This function simply updates the backend's tot_weight and tot_used values
134 * after servers weights have been updated. It is designed to be used after
135 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200136 *
137 * threads: this is the caller responsibility to lock data. For now, this
138 * function is called from lb modules, so it should be ok. But if you need to
139 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100140 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200141void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100142{
Willy Tarreau20697042007-11-15 23:26:18 +0100143 if (px->srv_act) {
144 px->lbprm.tot_weight = px->lbprm.tot_wact;
145 px->lbprm.tot_used = px->srv_act;
146 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100147 else if (px->lbprm.fbck) {
148 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200149 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100150 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100151 }
152 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100153 px->lbprm.tot_weight = px->lbprm.tot_wbck;
154 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100155 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100156}
157
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200158/*
159 * This function tries to find a running server for the proxy <px> following
160 * the source hash method. Depending on the number of active/backup servers,
161 * it will either look for active servers, or for backup servers.
162 * If any server is found, it will be returned. If no valid server is found,
163 * NULL is returned.
164 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100165static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200166{
167 unsigned int h, l;
168
169 if (px->lbprm.tot_weight == 0)
170 return NULL;
171
172 l = h = 0;
173
174 /* note: we won't hash if there's only one server left */
175 if (px->lbprm.tot_used == 1)
176 goto hash_done;
177
178 while ((l + sizeof (int)) <= len) {
179 h ^= ntohl(*(unsigned int *)(&addr[l]));
180 l += sizeof (int);
181 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500182 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100183 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200184 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100185 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100186 return chash_get_server_hash(px, h, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200187 else
188 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200189}
190
191/*
192 * This function tries to find a running server for the proxy <px> following
193 * the URI hash method. In order to optimize cache hits, the hash computation
194 * ends at the question mark. Depending on the number of active/backup servers,
195 * it will either look for active servers, or for backup servers.
196 * If any server is found, it will be returned. If no valid server is found,
Willy Tarreaua9a72492019-01-14 16:14:15 +0100197 * NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
Willy Tarreau3d1119d2020-09-23 08:05:47 +0200198 * the "whole" optional argument (boolean, bit0), the "len" argument (numeric)
199 * and the "depth" argument (numeric).
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200200 *
201 * This code was contributed by Guillaume Dallaire, who also selected this hash
202 * algorithm out of a tens because it gave him the best results.
203 *
204 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100205static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200206{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700207 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200208 int c;
209 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400210 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200211
212 if (px->lbprm.tot_weight == 0)
213 return NULL;
214
215 /* note: we won't hash if there's only one server left */
216 if (px->lbprm.tot_used == 1)
217 goto hash_done;
218
Willy Tarreaua9a72492019-01-14 16:14:15 +0100219 if (px->lbprm.arg_opt2) // "len"
220 uri_len = MIN(uri_len, px->lbprm.arg_opt2);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200221
Bhaskar98634f02013-10-29 23:30:51 -0400222 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200223 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200224 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200225 if (c == '/') {
226 slashes++;
Willy Tarreaua9a72492019-01-14 16:14:15 +0100227 if (slashes == px->lbprm.arg_opt3) /* depth+1 */
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200228 break;
229 }
Willy Tarreau3d1119d2020-09-23 08:05:47 +0200230 else if (c == '?' && !(px->lbprm.arg_opt1 & 1)) // "whole"
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200231 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200232 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200233 }
Bhaskar98634f02013-10-29 23:30:51 -0400234
235 hash = gen_hash(px, start, (end - start));
236
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500237 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100238 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200239 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100240 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100241 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200242 else
243 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200244}
245
Christopher Faulet5b517552017-06-09 14:17:53 +0200246/*
Willy Tarreau01732802007-11-01 22:48:15 +0100247 * This function tries to find a running server for the proxy <px> following
248 * the URL parameter hash method. It looks for a specific parameter in the
249 * URL and hashes it to compute the server ID. This is useful to optimize
250 * performance by avoiding bounces between servers in contexts where sessions
251 * are shared but cookies are not usable. If the parameter is not found, NULL
252 * is returned. If any server is found, it will be returned. If no valid server
253 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100254 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100255static struct server *get_server_ph(struct proxy *px, const char *uri, int uri_len, const struct server *avoid)
Willy Tarreau01732802007-11-01 22:48:15 +0100256{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700257 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400258 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200259 const char *p;
260 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100261 int plen;
262
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200263 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100264 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100265 return NULL;
266
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200267 if ((p = memchr(uri, '?', uri_len)) == NULL)
268 return NULL;
269
Willy Tarreau01732802007-11-01 22:48:15 +0100270 p++;
271
272 uri_len -= (p - uri);
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100273 plen = px->lbprm.arg_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200274 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100275
276 while (uri_len > plen) {
277 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200278 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100279 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200280 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100281 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200282 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100283 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200284 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400285 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200286 uri_len -= plen + 1;
287
Bhaskar98634f02013-10-29 23:30:51 -0400288 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100289 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400290 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100291 }
Bhaskar98634f02013-10-29 23:30:51 -0400292 hash = gen_hash(px, start, (end - start));
293
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500294 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100295 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400296
Willy Tarreau6c30be52019-01-14 17:07:39 +0100297 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100298 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200299 else
300 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100301 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200302 }
303 /* skip to next parameter */
304 p = memchr(params, '&', uri_len);
305 if (!p)
306 return NULL;
307 p++;
308 uri_len -= (p - params);
309 params = p;
310 }
311 return NULL;
312}
313
314/*
315 * this does the same as the previous server_ph, but check the body contents
316 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100317static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200318{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700319 unsigned int hash = 0;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100320 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200321 struct proxy *px = s->be;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200322 struct htx *htx = htxbuf(&req->buf);
323 struct htx_blk *blk;
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100324 unsigned int plen = px->lbprm.arg_len;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100325 unsigned long len;
326 const char *params, *p, *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200327
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100328 if (px->lbprm.tot_weight == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200329 return NULL;
330
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200331 p = params = NULL;
332 len = 0;
333 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
334 enum htx_blk_type type = htx_get_blk_type(blk);
335 struct ist v;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200336
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200337 if (type != HTX_BLK_DATA)
338 continue;
339 v = htx_get_blk_value(htx, blk);
340 p = params = v.ptr;
341 len = v.len;
342 break;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100343 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200344
345 while (len > plen) {
346 /* Look for the parameter name followed by an equal symbol */
347 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100348 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200349 /* OK, we have the parameter here at <params>, and
350 * the value after the equal sign, at <p>
351 * skip the equal symbol
352 */
353 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400354 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200355 len -= plen + 1;
356
Bhaskar98634f02013-10-29 23:30:51 -0400357 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200358 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100359 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400360 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100361 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200362 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
363 break;
364 return NULL; /* oh, no; this is not uri-encoded.
365 * This body does not contain parameters.
366 */
367 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200368 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400369 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200370 /* should we break if vlen exceeds limit? */
371 }
Bhaskar98634f02013-10-29 23:30:51 -0400372 hash = gen_hash(px, start, (end - start));
373
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500374 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100375 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400376
Willy Tarreau6c30be52019-01-14 17:07:39 +0100377 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100378 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200379 else
380 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200381 }
382 }
Willy Tarreau01732802007-11-01 22:48:15 +0100383 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200384 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100385 if (!p)
386 return NULL;
387 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200388 len -= (p - params);
389 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100390 }
391 return NULL;
392}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200393
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200394
Willy Tarreaubaaee002006-06-26 02:48:02 +0200395/*
Benoitaffb4812009-03-25 13:02:10 +0100396 * This function tries to find a running server for the proxy <px> following
397 * the Header parameter hash method. It looks for a specific parameter in the
398 * URL and hashes it to compute the server ID. This is useful to optimize
399 * performance by avoiding bounces between servers in contexts where sessions
400 * are shared but cookies are not usable. If the parameter is not found, NULL
401 * is returned. If any server is found, it will be returned. If no valid server
Willy Tarreau9fed8582019-01-14 16:04:54 +0100402 * is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
403 * apply to the middle part of a domain name ("use_domain_only" option).
Benoitaffb4812009-03-25 13:02:10 +0100404 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100405static struct server *get_server_hh(struct stream *s, const struct server *avoid)
Benoitaffb4812009-03-25 13:02:10 +0100406{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700407 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100408 struct proxy *px = s->be;
Willy Tarreau484ff072019-01-14 15:28:53 +0100409 unsigned int plen = px->lbprm.arg_len;
Benoitaffb4812009-03-25 13:02:10 +0100410 unsigned long len;
Benoitaffb4812009-03-25 13:02:10 +0100411 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400412 const char *start, *end;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200413 struct htx *htx = htxbuf(&s->req.buf);
414 struct http_hdr_ctx ctx = { .blk = NULL };
Benoitaffb4812009-03-25 13:02:10 +0100415
416 /* tot_weight appears to mean srv_count */
417 if (px->lbprm.tot_weight == 0)
418 return NULL;
419
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200420 /* note: we won't hash if there's only one server left */
421 if (px->lbprm.tot_used == 1)
422 goto hash_done;
423
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200424 http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100425
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200426 /* if the header is not found or empty, let's fallback to round robin */
427 if (!ctx.blk || !ctx.value.len)
428 return NULL;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100429
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200430 /* Found a the param_name in the headers.
431 * we will compute the hash based on this value ctx.val.
432 */
433 len = ctx.value.len;
434 p = ctx.value.ptr;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100435
Willy Tarreau9fed8582019-01-14 16:04:54 +0100436 if (!px->lbprm.arg_opt1) {
Bhaskar98634f02013-10-29 23:30:51 -0400437 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100438 } else {
439 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100440 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100441 /* special computation, use only main domain name, not tld/host
442 * going back from the end of string, start hashing at first
443 * dot stop at next.
444 * This is designed to work with the 'Host' header, and requires
445 * a special option to activate this.
446 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100447 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100448 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100449 if (dohash) {
450 /* Rewind the pointer until the previous char
451 * is a dot, this will allow to set the start
452 * position of the domain. */
453 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100454 break;
Benoitaffb4812009-03-25 13:02:10 +0100455 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100456 else if (*p == '.') {
457 /* The pointer is rewinded to the dot before the
458 * tld, we memorize the end of the domain and
459 * can enter the domain processing. */
460 end = p;
461 dohash = 1;
462 }
Benoitaffb4812009-03-25 13:02:10 +0100463 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100464 len--;
Benoitaffb4812009-03-25 13:02:10 +0100465 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100466 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400467 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100468 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500469 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100470 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200471 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100472 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100473 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200474 else
475 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100476}
477
Willy Tarreau34db1082012-04-19 17:16:54 +0200478/* RDP Cookie HASH. */
Willy Tarreau59884a62019-01-02 14:48:31 +0100479static struct server *get_server_rch(struct stream *s, const struct server *avoid)
Emeric Brun736aa232009-06-30 17:56:00 +0200480{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700481 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200482 struct proxy *px = s->be;
483 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200484 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200485 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200486 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200487
488 /* tot_weight appears to mean srv_count */
489 if (px->lbprm.tot_weight == 0)
490 return NULL;
491
Willy Tarreau37406352012-04-23 16:16:37 +0200492 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200493
Willy Tarreau6a445eb2018-06-19 07:04:45 +0200494 rewind = co_data(&s->req);
495 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200496
Willy Tarreau484ff072019-01-14 15:28:53 +0100497 ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200498 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100499
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200500 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200501
Willy Tarreau37406352012-04-23 16:16:37 +0200502 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200503 return NULL;
504
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200505 /* note: we won't hash if there's only one server left */
506 if (px->lbprm.tot_used == 1)
507 goto hash_done;
508
Willy Tarreau484ff072019-01-14 15:28:53 +0100509 /* Found the param_name in the headers.
Emeric Brun736aa232009-06-30 17:56:00 +0200510 * we will compute the hash based on this value ctx.val.
511 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200512 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400513
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500514 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100515 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200516 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100517 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100518 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200519 else
520 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200521}
Christopher Faulet5b517552017-06-09 14:17:53 +0200522
Willy Tarreau760e81d2018-05-03 07:20:40 +0200523/* random value */
Willy Tarreau59884a62019-01-02 14:48:31 +0100524static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
Willy Tarreau760e81d2018-05-03 07:20:40 +0200525{
526 unsigned int hash = 0;
527 struct proxy *px = s->be;
Willy Tarreau21c741a2019-01-14 18:14:27 +0100528 struct server *prev, *curr;
529 int draws = px->lbprm.arg_opt1; // number of draws
Willy Tarreau760e81d2018-05-03 07:20:40 +0200530
531 /* tot_weight appears to mean srv_count */
532 if (px->lbprm.tot_weight == 0)
533 return NULL;
534
Willy Tarreau21c741a2019-01-14 18:14:27 +0100535 curr = NULL;
536 do {
537 prev = curr;
Willy Tarreaub9f54c52020-03-08 17:31:39 +0100538 hash = ha_random32();
Willy Tarreau21c741a2019-01-14 18:14:27 +0100539 curr = chash_get_server_hash(px, hash, avoid);
540 if (!curr)
541 break;
542
543 /* compare the new server to the previous best choice and pick
544 * the one with the least currently served requests.
545 */
546 if (prev && prev != curr &&
547 curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
548 curr = prev;
549 } while (--draws > 0);
550
Willy Tarreaub88ae182020-09-29 16:58:30 +0200551 /* if the selected server is full, pretend we have none so that we reach
552 * the backend's queue instead.
553 */
554 if (curr &&
555 (curr->nbpend || (curr->maxconn && curr->served >= srv_dynamic_maxconn(curr))))
556 curr = NULL;
557
Willy Tarreau21c741a2019-01-14 18:14:27 +0100558 return curr;
Willy Tarreau760e81d2018-05-03 07:20:40 +0200559}
560
Benoitaffb4812009-03-25 13:02:10 +0100561/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200562 * This function applies the load-balancing algorithm to the stream, as
563 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200564 * 'assigned'.
565 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200566 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200567 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100568 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200569 * The function tries to keep the original connection slot if it reconnects to
570 * the same server, otherwise it releases it and tries to offer it.
571 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200572 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200573 *
574 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100575 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200576 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
577 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200578 * SRV_STATUS_INTERNAL for other unrecoverable errors.
579 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200580 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100581 * it does not need to be called anymore. This means that target_srv(&s->target)
582 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200583 *
584 */
585
Willy Tarreau87b09662015-04-03 00:22:06 +0200586int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200587{
Olivier Houchardba4fff52018-12-01 14:40:40 +0100588 struct connection *conn = NULL;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200589 struct server *conn_slot;
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100590 struct server *srv = NULL, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200591 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100592
Simon Horman8effd3d2011-08-13 08:03:52 +0900593 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200594
Willy Tarreau7c669d72008-06-20 15:04:11 +0200595 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200596 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200597 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100598
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100599 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200600 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200601
Willy Tarreau7c669d72008-06-20 15:04:11 +0200602 /* We have to release any connection slot before applying any LB algo,
603 * otherwise we may erroneously end up with no available slot.
604 */
605 if (conn_slot)
606 sess_change_server(s, NULL);
607
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100608 /* We will now try to find the good server and store it into <objt_server(s->target)>.
609 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200610 * as well as if no server is available (check error code).
611 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100612
Willy Tarreau827aee92011-03-10 16:55:02 +0100613 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100614 s->target = NULL;
Willy Tarreau664beb82011-03-10 11:38:29 +0100615
Olivier Houchardba4fff52018-12-01 14:40:40 +0100616 if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200617 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100618 (s->be->options & PR_O_PREF_LAST))) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100619 struct sess_srv_list *srv_list;
620 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
621 struct server *tmpsrv = objt_server(srv_list->target);
Olivier Houchardba4fff52018-12-01 14:40:40 +0100622
623 if (tmpsrv && tmpsrv->proxy == s->be &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200624 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100625 (!s->be->max_ka_queue ||
626 server_has_room(tmpsrv) || (
627 tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
628 srv_currently_usable(tmpsrv)) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100629 list_for_each_entry(conn, &srv_list->conn_list, session_list) {
Willy Tarreau911db9b2020-01-23 16:27:54 +0100630 if (!(conn->flags & CO_FL_WAIT_XPRT)) {
Olivier Houchardba4fff52018-12-01 14:40:40 +0100631 srv = tmpsrv;
632 s->target = &srv->obj_type;
Christopher Faulete91a5262020-07-01 18:56:30 +0200633 if (conn->flags & CO_FL_SESS_IDLE) {
634 conn->flags &= ~CO_FL_SESS_IDLE;
635 s->sess->idle_conns--;
636 }
Olivier Houchardba4fff52018-12-01 14:40:40 +0100637 goto out_ok;
638 }
639 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100640 }
641 }
Willy Tarreau9420b122013-12-15 18:58:25 +0100642 }
Christopher Faulet5b517552017-06-09 14:17:53 +0200643
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200644 if (s->be->lbprm.algo & BE_LB_KIND) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200645 /* we must check if we have at least one server available */
646 if (!s->be->lbprm.tot_weight) {
647 err = SRV_STATUS_NOSRV;
648 goto out;
649 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200650
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200651 /* if there's some queue on the backend, with certain algos we
652 * know it's because all servers are full.
653 */
654 if (s->be->nbpend &&
Willy Tarreau8ae8c482020-10-22 17:19:07 +0200655 (((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_FAS)|| // first
Willy Tarreau82cd5c12020-09-29 17:07:21 +0200656 ((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_RR) || // roundrobin
657 ((s->be->lbprm.algo & (BE_LB_KIND|BE_LB_NEED|BE_LB_PARM)) == BE_LB_ALGO_SRR))) { // static-rr
658 err = SRV_STATUS_FULL;
659 goto out;
660 }
661
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200662 /* First check whether we need to fetch some data or simply call
663 * the LB lookup function. Only the hashing functions will need
664 * some input data in fact, and will support multiple algorithms.
665 */
666 switch (s->be->lbprm.algo & BE_LB_LKUP) {
667 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100668 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200669 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200670
Willy Tarreauf09c6602012-02-13 17:12:08 +0100671 case BE_LB_LKUP_FSTREE:
672 srv = fas_get_next_server(s->be, prev_srv);
673 break;
674
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200675 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100676 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200677 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200678
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200679 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200680 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200681 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200682 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
Willy Tarreau59884a62019-01-02 14:48:31 +0100683 srv = get_server_rnd(s, prev_srv);
Willy Tarreau6c30be52019-01-14 17:07:39 +0100684 else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100685 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200686 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100687 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200688 break;
689 }
690 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200691 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200692 err = SRV_STATUS_INTERNAL;
693 goto out;
694 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200695
696 switch (s->be->lbprm.algo & BE_LB_PARM) {
697 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200698 conn = objt_conn(strm_orig(s));
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200699 if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200700 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200701 (void *)&((struct sockaddr_in *)conn->src)->sin_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100702 4, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200703 }
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200704 else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200705 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200706 (void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100707 16, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200708 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200709 else {
710 /* unknown IP family */
711 err = SRV_STATUS_INTERNAL;
712 goto out;
713 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200714 break;
715
716 case BE_LB_HASH_URI:
717 /* URI hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200718 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100719 struct ist uri;
720
Christopher Faulet297fbb42019-05-13 14:41:27 +0200721 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Willy Tarreau57a37412020-09-23 08:56:29 +0200722 if (s->be->lbprm.arg_opt1 & 2) {
723 uri = http_get_path(uri);
724 if (!uri.ptr)
725 uri = ist("");
726 }
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100727 srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
728 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200729 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200730
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200731 case BE_LB_HASH_PRM:
732 /* URL Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200733 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100734 struct ist uri;
735
Christopher Faulet297fbb42019-05-13 14:41:27 +0200736 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100737 srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100738
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200739 if (!srv && s->txn->meth == HTTP_METH_POST)
740 srv = get_server_ph_post(s, prev_srv);
741 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200742 break;
Benoitaffb4812009-03-25 13:02:10 +0100743
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200744 case BE_LB_HASH_HDR:
745 /* Header Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200746 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
747 srv = get_server_hh(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200748 break;
749
750 case BE_LB_HASH_RDP:
751 /* RDP Cookie hashing */
Willy Tarreau59884a62019-01-02 14:48:31 +0100752 srv = get_server_rch(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200753 break;
754
755 default:
756 /* unknown balancing algorithm */
757 err = SRV_STATUS_INTERNAL;
758 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100759 }
Emeric Brun736aa232009-06-30 17:56:00 +0200760
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200761 /* If the hashing parameter was not found, let's fall
762 * back to round robin on the map.
763 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100764 if (!srv) {
Willy Tarreau6c30be52019-01-14 17:07:39 +0100765 if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100766 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200767 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100768 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200769 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200770
771 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200772 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200773
Willy Tarreau7c669d72008-06-20 15:04:11 +0200774 default:
775 /* unknown balancing algorithm */
776 err = SRV_STATUS_INTERNAL;
777 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200778 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200779
Willy Tarreau827aee92011-03-10 16:55:02 +0100780 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200781 err = SRV_STATUS_FULL;
782 goto out;
783 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100784 else if (srv != prev_srv) {
Olivier Houchard237f7812019-03-08 18:49:07 +0100785 _HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
786 _HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100787 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100788 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200789 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200790 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100791 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200792 }
Olivier Houchard2442f682018-12-01 17:03:38 +0100793 else if ((s->be->options & PR_O_HTTP_PROXY)) {
794 conn = cs_conn(objt_cs(s->si[1].end));
795
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200796 if (conn && conn->dst && is_addr(conn->dst)) {
Olivier Houchard2442f682018-12-01 17:03:38 +0100797 /* in proxy mode, we need a valid destination address */
798 s->target = &s->be->obj_type;
799 } else {
800 err = SRV_STATUS_NOSRV;
801 goto out;
802 }
Willy Tarreau664beb82011-03-10 11:38:29 +0100803 }
804 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200805 err = SRV_STATUS_NOSRV;
806 goto out;
807 }
808
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100809out_ok:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200810 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200811 err = SRV_STATUS_OK;
812 out:
813
814 /* Either we take back our connection slot, or we offer it to someone
815 * else if we don't need it anymore.
816 */
817 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100818 if (conn_slot == srv) {
819 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200820 } else {
821 if (may_dequeue_tasks(conn_slot, s->be))
822 process_srv_queue(conn_slot);
823 }
824 }
825
826 out_err:
827 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200828}
829
Willy Tarreaubaaee002006-06-26 02:48:02 +0200830/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200831 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200832 * The address is taken from the currently assigned server, or from the
833 * dispatch or transparent address.
834 *
835 * It may return :
836 * SRV_STATUS_OK if everything is OK.
837 * SRV_STATUS_INTERNAL for other unrecoverable errors.
838 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200839 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200840 * not cleared, so it's to the caller to clear it if required.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200841 */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200842int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200843{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200844 struct connection *cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200845
Christopher Faulet56803b12017-11-24 16:06:18 +0100846 DPRINTF(stderr,"assign_server_address : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200847
Willy Tarreau9b7587a2020-10-15 07:32:10 +0200848 if (!sockaddr_alloc(&s->target_addr, NULL, 0))
Willy Tarreauca79f592019-07-17 19:04:47 +0200849 return SRV_STATUS_INTERNAL;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200850
Willy Tarreaue7dff022015-04-03 01:14:29 +0200851 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200852 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200853 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200854 return SRV_STATUS_INTERNAL;
855
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200856 *s->target_addr = __objt_server(s->target)->addr;
857 set_host_port(s->target_addr, __objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200858
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200859 if (!is_addr(s->target_addr) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200860 /* if the server has no address, we use the same address
861 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200862 * locally on multiple addresses at once. Nothing is done
863 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200864 */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200865 if (!conn_get_dst(cli_conn)) {
866 /* do nothing if we can't retrieve the address */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200867 } else if (cli_conn->dst->ss_family == AF_INET) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200868 ((struct sockaddr_in *)s->target_addr)->sin_addr = ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200869 } else if (cli_conn->dst->ss_family == AF_INET6) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200870 ((struct sockaddr_in6 *)s->target_addr)->sin6_addr = ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200871 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200872 }
873
Willy Tarreaubaaee002006-06-26 02:48:02 +0200874 /* if this server remaps proxied ports, we'll use
875 * the port the client connected to with an offset. */
Willy Tarreau1e582e52018-09-20 11:29:28 +0200876 if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100877 int base_port;
878
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200879 if (conn_get_dst(cli_conn)) {
880 /* First, retrieve the port from the incoming connection */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200881 base_port = get_host_port(cli_conn->dst);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100882
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200883 /* Second, assign the outgoing connection's port */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200884 base_port += get_host_port(s->target_addr);
885 set_host_port(s->target_addr, base_port);
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200886 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200887 }
888 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200889 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200890 /* connect to the defined dispatch addr */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200891 *s->target_addr = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200892 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200893 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200894 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200895 if (conn_get_dst(cli_conn) &&
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200896 (cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200897 *s->target_addr = *cli_conn->dst;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200898 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100899 else if (s->be->options & PR_O_HTTP_PROXY) {
900 /* If HTTP PROXY option is set, then server is already assigned
901 * during incoming client request parsing. */
902 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100903 else {
904 /* no server and no LB algorithm ! */
905 return SRV_STATUS_INTERNAL;
906 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200907
Willy Tarreaue7dff022015-04-03 01:14:29 +0200908 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200909 return SRV_STATUS_OK;
910}
911
Willy Tarreau87b09662015-04-03 00:22:06 +0200912/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200913 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200914 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200915 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200916 * be called before any connection and after any retry or redispatch occurs.
917 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200918 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200919 *
920 * Returns :
921 *
922 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100923 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200924 * SRV_STATUS_QUEUED if the connection has been queued.
925 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100926 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200927 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200928 * SRV_STATUS_INTERNAL for other unrecoverable errors.
929 *
930 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200931int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200932{
933 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100934 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200935 int err;
936
937 if (s->pend_pos)
938 return SRV_STATUS_INTERNAL;
939
Willy Tarreau7c669d72008-06-20 15:04:11 +0200940 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200941 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100942 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100943
Willy Tarreau7c669d72008-06-20 15:04:11 +0200944 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100945 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200946 /* This stream was previously assigned to a server. We have to
947 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200948 * - if the server changed :
949 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200950 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200951 * - increment srv->redispatches and be->redispatches
952 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100953 */
954
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100955 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200956 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
957 s->txn->flags &= ~TX_CK_MASK;
958 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200959 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200960 s->flags |= SF_REDISP;
Olivier Houchard237f7812019-03-08 18:49:07 +0100961 _HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
962 _HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200963 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +0100964 _HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
965 _HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100966 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100967 }
968 }
969
Willy Tarreaubaaee002006-06-26 02:48:02 +0200970 switch (err) {
971 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200972 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100973 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100974 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200975 return SRV_STATUS_OK; /* dispatch or proxy mode */
976
977 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100978 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200979 return SRV_STATUS_OK;
980
Willy Tarreau87b09662015-04-03 00:22:06 +0200981 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200982 * connection slot yet. Either it is a redispatch, or it was
983 * assigned from persistence information (direct mode).
984 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200985 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200986 /* server scheduled for redirection, and already assigned. We
987 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100988 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100989 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100990 return SRV_STATUS_OK;
991 }
992
Willy Tarreau87b09662015-04-03 00:22:06 +0200993 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200994 * We know we have to queue it into the server's queue, so if a maxqueue
995 * is set on the server, we must also check that the server's queue is
996 * not full, in which case we have to return FULL.
997 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100998 if (srv->maxconn &&
999 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +02001000
Willy Tarreau827aee92011-03-10 16:55:02 +01001001 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +02001002 return SRV_STATUS_FULL;
1003
Willy Tarreaubaaee002006-06-26 02:48:02 +02001004 p = pendconn_add(s);
1005 if (p)
1006 return SRV_STATUS_QUEUED;
1007 else
Willy Tarreau7c669d72008-06-20 15:04:11 +02001008 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001009 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001010
1011 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +01001012 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001013 return SRV_STATUS_OK;
1014
1015 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +02001016 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001017 p = pendconn_add(s);
1018 if (p)
1019 return SRV_STATUS_QUEUED;
1020 else
Willy Tarreau7c669d72008-06-20 15:04:11 +02001021 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001022
1023 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +02001024 return err;
1025
Willy Tarreaubaaee002006-06-26 02:48:02 +02001026 case SRV_STATUS_INTERNAL:
1027 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001028
Willy Tarreaubaaee002006-06-26 02:48:02 +02001029 default:
1030 return SRV_STATUS_INTERNAL;
1031 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +01001032}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001033
Willy Tarreaub1d67742010-03-29 19:36:59 +02001034/* If an explicit source binding is specified on the server and/or backend, and
1035 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +02001036 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +01001037 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +02001038 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001039static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +02001040{
Willy Tarreau29fbe512015-08-20 19:35:14 +02001041#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001042 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001043 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001044 struct connection *cli_conn;
Olivier Houchard09a0f032019-01-17 15:59:13 +01001045 struct connection *srv_conn;
1046
1047 if (objt_cs(s->si[1].end))
1048 srv_conn = cs_conn(__objt_cs(s->si[1].end));
1049 else
1050 srv_conn = objt_conn(s->si[1].end);
Willy Tarreau827aee92011-03-10 16:55:02 +01001051
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001052 if (srv && srv->conn_src.opts & CO_SRC_BIND)
1053 src = &srv->conn_src;
1054 else if (s->be->conn_src.opts & CO_SRC_BIND)
1055 src = &s->be->conn_src;
1056 else
1057 return;
Willy Tarreau294c4732011-12-16 21:35:50 +01001058
Willy Tarreau9b7587a2020-10-15 07:32:10 +02001059 if (!sockaddr_alloc(&srv_conn->src, NULL, 0))
Willy Tarreauca79f592019-07-17 19:04:47 +02001060 return;
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001061
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001062 switch (src->opts & CO_SRC_TPROXY_MASK) {
1063 case CO_SRC_TPROXY_ADDR:
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001064 *srv_conn->src = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001065 break;
1066 case CO_SRC_TPROXY_CLI:
1067 case CO_SRC_TPROXY_CIP:
1068 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001069 cli_conn = objt_conn(strm_orig(s));
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001070 if (cli_conn && conn_get_src(cli_conn))
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001071 *srv_conn->src = *cli_conn->src;
1072 else {
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001073 sockaddr_free(&srv_conn->src);
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001074 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001075 break;
1076 case CO_SRC_TPROXY_DYN:
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001077 if (src->bind_hdr_occ && IS_HTX_STRM(s)) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001078 char *vptr;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001079 size_t vlen;
Willy Tarreau294c4732011-12-16 21:35:50 +01001080
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001081 /* bind to the IP in a header */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001082 ((struct sockaddr_in *)srv_conn->src)->sin_family = AF_INET;
1083 ((struct sockaddr_in *)srv_conn->src)->sin_port = 0;
1084 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr = 0;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001085 if (http_get_htx_hdr(htxbuf(&s->req.buf),
1086 ist2(src->bind_hdr_name, src->bind_hdr_len),
1087 src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001088 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr =
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001089 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001090 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001091 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001092 break;
1093 default:
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001094 sockaddr_free(&srv_conn->src);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001095 }
1096#endif
1097}
1098
Olivier Houchard566df302020-03-06 18:18:56 +01001099/* Attempt to get a backend connection from the specified mt_list array
Willy Tarreau0d587112020-07-01 15:04:38 +02001100 * (safe or idle connections). The <is_safe> argument means what type of
1101 * connection the caller wants.
Olivier Houchard566df302020-03-06 18:18:56 +01001102 */
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001103static struct connection *conn_backend_get(struct stream *s, struct server *srv, int is_safe)
Olivier Houchard566df302020-03-06 18:18:56 +01001104{
1105 struct mt_list *mt_list = is_safe ? srv->safe_conns : srv->idle_conns;
1106 struct connection *conn;
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001107 int i; // thread number
Olivier Houchard566df302020-03-06 18:18:56 +01001108 int found = 0;
Willy Tarreau364f25a2020-07-01 15:55:30 +02001109 int stop;
Olivier Houchard566df302020-03-06 18:18:56 +01001110
1111 /* We need to lock even if this is our own list, because another
1112 * thread may be trying to migrate that connection, and we don't want
1113 * to end up with two threads using the same connection.
1114 */
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001115 i = tid;
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001116 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard566df302020-03-06 18:18:56 +01001117 conn = MT_LIST_POP(&mt_list[tid], struct connection *, list);
Willy Tarreau0d587112020-07-01 15:04:38 +02001118
1119 /* If we failed to pick a connection from the idle list, let's try again with
1120 * the safe list.
1121 */
1122 if (!conn && !is_safe && srv->curr_safe_nb > 0) {
1123 conn = MT_LIST_POP(&srv->safe_conns[tid], struct connection *, list);
1124 if (conn) {
1125 is_safe = 1;
1126 mt_list = srv->safe_conns;
1127 }
1128 }
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001129 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard566df302020-03-06 18:18:56 +01001130
1131 /* If we found a connection in our own list, and we don't have to
1132 * steal one from another thread, then we're done.
1133 */
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001134 if (conn)
1135 goto done;
1136
Willy Tarreau76cc6992020-07-01 18:49:24 +02001137 /* pool sharing globally disabled ? */
1138 if (!(global.tune.options & GTUNE_IDLE_POOL_SHARED))
1139 goto done;
1140
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001141 /* Are we allowed to pick from another thread ? We'll still try
1142 * it if we're running low on FDs as we don't want to create
1143 * extra conns in this case, otherwise we can give up if we have
1144 * too few idle conns.
1145 */
1146 if (srv->curr_idle_conns < srv->low_idle_conns &&
1147 ha_used_fds < global.tune.pool_low_count)
1148 goto done;
Olivier Houchard566df302020-03-06 18:18:56 +01001149
Willy Tarreau364f25a2020-07-01 15:55:30 +02001150 /* Lookup all other threads for an idle connection, starting from last
1151 * unvisited thread.
1152 */
1153 stop = srv->next_takeover;
1154 if (stop >= global.nbthread)
1155 stop = 0;
1156
Amaury Denoyelle5f1ded52020-10-14 18:17:03 +02001157 i = stop;
1158 do {
Olivier Houchard566df302020-03-06 18:18:56 +01001159 struct mt_list *elt1, elt2;
1160
Willy Tarreau364f25a2020-07-01 15:55:30 +02001161 if (!srv->curr_idle_thr[i] || i == tid)
Willy Tarreau151c2532020-07-01 08:24:44 +02001162 continue;
1163
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001164 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[i].takeover_lock);
Olivier Houchard566df302020-03-06 18:18:56 +01001165 mt_list_for_each_entry_safe(conn, &mt_list[i], list, elt1, elt2) {
Olivier Houchard1662cdb2020-07-03 14:04:37 +02001166 if (conn->mux->takeover && conn->mux->takeover(conn, i) == 0) {
Olivier Houchard566df302020-03-06 18:18:56 +01001167 MT_LIST_DEL_SAFE(elt1);
Willy Tarreaub1591322020-06-29 14:17:59 +02001168 _HA_ATOMIC_ADD(&activity[tid].fd_takeover, 1);
Olivier Houchard566df302020-03-06 18:18:56 +01001169 found = 1;
Amaury Denoyelle9c13b622020-10-14 18:17:04 +02001170
Olivier Houchard566df302020-03-06 18:18:56 +01001171 break;
1172 }
1173 }
Willy Tarreau0d587112020-07-01 15:04:38 +02001174
1175 if (!found && !is_safe && srv->curr_safe_nb > 0) {
1176 mt_list_for_each_entry_safe(conn, &srv->safe_conns[i], list, elt1, elt2) {
Olivier Houchard1662cdb2020-07-03 14:04:37 +02001177 if (conn->mux->takeover && conn->mux->takeover(conn, i) == 0) {
Willy Tarreau0d587112020-07-01 15:04:38 +02001178 MT_LIST_DEL_SAFE(elt1);
1179 _HA_ATOMIC_ADD(&activity[tid].fd_takeover, 1);
1180 found = 1;
1181 is_safe = 1;
1182 mt_list = srv->safe_conns;
Amaury Denoyelle9c13b622020-10-14 18:17:04 +02001183
Willy Tarreau0d587112020-07-01 15:04:38 +02001184 break;
1185 }
1186 }
1187 }
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001188 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[i].takeover_lock);
Amaury Denoyelle5f1ded52020-10-14 18:17:03 +02001189 } while (!found && (i = (i + 1 == global.nbthread) ? 0 : i + 1) != stop);
Olivier Houchard566df302020-03-06 18:18:56 +01001190
1191 if (!found)
1192 conn = NULL;
Willy Tarreau2f3f4d32020-07-01 07:43:51 +02001193 done:
1194 if (conn) {
Willy Tarreau364f25a2020-07-01 15:55:30 +02001195 _HA_ATOMIC_STORE(&srv->next_takeover, (i + 1 == global.nbthread) ? 0 : i + 1);
Amaury Denoyelle9c13b622020-10-14 18:17:04 +02001196
1197 srv_use_conn(srv, conn);
1198
1199 _HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
1200 _HA_ATOMIC_SUB(conn->flags & CO_FL_SAFE_LIST ? &srv->curr_safe_nb : &srv->curr_idle_nb, 1);
1201 _HA_ATOMIC_SUB(&srv->curr_idle_thr[i], 1);
1202 conn->flags &= ~CO_FL_LIST_MASK;
1203 __ha_barrier_atomic_store();
1204
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001205 if ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_SAFE &&
1206 conn->mux->flags & MX_FL_HOL_RISK) {
1207 /* attach the connection to the session private list
1208 */
1209 conn->owner = s->sess;
Willy Tarreau38b4d2e2020-11-20 17:08:15 +01001210 session_add_conn(s->sess, conn, conn->target);
Amaury Denoyelle0d21dea2020-10-14 18:17:09 +02001211 }
1212 else {
1213 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&conn->list));
1214 }
Olivier Houchard566df302020-03-06 18:18:56 +01001215 }
1216 return conn;
1217}
1218
Willy Tarreaubaaee002006-06-26 02:48:02 +02001219/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001220 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001221 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001222 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001223 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001224 * - SF_ERR_NONE if everything's OK
1225 * - SF_ERR_SRVTO if there are no more servers
1226 * - SF_ERR_SRVCL if the connection was refused by the server
1227 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1228 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1229 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001230 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001231 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001232 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001233 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001234int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001235{
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001236 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001237 struct connection *srv_conn = NULL;
Olivier Houchard2442f682018-12-01 17:03:38 +01001238 struct conn_stream *srv_cs = NULL;
Willy Tarreau827aee92011-03-10 16:55:02 +01001239 struct server *srv;
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001240 const int reuse_mode = s->be->options & PR_O_REUSE_MASK;
Willy Tarreau34601a82013-12-15 16:33:46 +01001241 int reuse = 0;
Olivier Houchard5cd62172019-01-04 15:52:26 +01001242 int init_mux = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001243 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001244
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001245
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001246 /* This will catch some corner cases such as lying connections resulting from
1247 * retries or connect timeouts but will rarely trigger.
Olivier Houchard0fa989f2018-12-05 17:08:55 +01001248 */
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001249 si_release_endpoint(&s->si[1]);
1250
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001251 srv = objt_server(s->target);
1252
Amaury Denoyellea81bb712021-01-28 17:33:26 +01001253 /* do not reuse if mode is http or if avail list is not allocated */
1254 if ((s->be->mode != PR_MODE_HTTP) || (srv && !srv->available_conns))
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001255 goto skip_reuse;
1256
Willy Tarreaub0821862019-07-18 19:26:11 +02001257 /* first, search for a matching connection in the session's idle conns */
Christopher Fauletfcc3d8a2020-07-01 16:36:51 +02001258 srv_conn = session_get_conn(s->sess, s->target);
1259 if (srv_conn)
1260 reuse = 1;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001261
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001262 if (srv && !reuse && reuse_mode != PR_O_REUSE_NEVR) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001263 /* Below we pick connections from the safe, idle or
1264 * available (which are safe too) lists based
Willy Tarreau449d74a2015-08-05 17:16:33 +02001265 * on the strategy, the fact that this is a first or second
1266 * (retryable) request, with the indicated priority (1 or 2) :
1267 *
1268 * SAFE AGGR ALWS
1269 *
1270 * +-----+-----+ +-----+-----+ +-----+-----+
1271 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1272 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1273 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1274 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1275 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1276 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
Willy Tarreaub0821862019-07-18 19:26:11 +02001277 *
1278 * Idle conns are necessarily looked up on the same thread so
1279 * that there is no concurrency issues.
Willy Tarreau449d74a2015-08-05 17:16:33 +02001280 */
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001281 if (!LIST_ISEMPTY(&srv->available_conns[tid])) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001282 srv_conn = LIST_ELEM(srv->available_conns[tid].n, struct connection *, list);
Olivier Houchard566df302020-03-06 18:18:56 +01001283 reuse = 1;
Willy Tarreau449d74a2015-08-05 17:16:33 +02001284 }
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001285 /* if no available connections found, search for an idle/safe */
1286 else if (srv->max_idle_conns && srv->curr_idle_conns > 0) {
1287 const int not_first_req = s->txn && s->txn->flags & TX_NOT_FIRST;
1288 const int idle = srv->curr_idle_nb > 0;
1289 const int safe = srv->curr_safe_nb > 0;
1290
1291 /* second column of the tables above,
1292 * search for an idle then safe conn */
1293 if (not_first_req) {
1294 if (idle || safe)
1295 srv_conn = conn_backend_get(s, srv, 0);
Olivier Houchard566df302020-03-06 18:18:56 +01001296 }
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001297 /* first column of the tables above */
1298 else if (reuse_mode >= PR_O_REUSE_AGGR) {
1299 /* search for a safe conn */
1300 if (safe)
1301 srv_conn = conn_backend_get(s, srv, 1);
1302 else if (reuse_mode == PR_O_REUSE_ALWS && idle)
1303 srv_conn = conn_backend_get(s, srv, 0);
Olivier Houchard566df302020-03-06 18:18:56 +01001304 }
Amaury Denoyelle37e25bc2021-01-26 14:35:25 +01001305
Christopher Faulet3d52f0f2020-07-02 15:45:56 +02001306 if (srv_conn)
Olivier Houchard566df302020-03-06 18:18:56 +01001307 reuse = 1;
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001308 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001309 }
1310
Willy Tarreaub0821862019-07-18 19:26:11 +02001311
1312 /* here reuse might have been set above, indicating srv_conn finally
1313 * is OK.
1314 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001315 if (reuse) {
1316 /* Disable connection reuse if a dynamic source is used.
1317 * As long as we don't share connections between servers,
1318 * we don't need to disable connection reuse on no-idempotent
1319 * requests nor when PROXY protocol is used.
1320 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001321 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1322 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1323 reuse = 0;
1324 }
1325 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1326 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1327 reuse = 0;
1328 }
1329 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001330
Olivier Houchardb3397362020-03-16 13:49:00 +01001331 if (ha_used_fds > global.tune.pool_high_count && srv && srv->idle_conns) {
Olivier Houchard88698d92019-04-16 19:07:22 +02001332 struct connection *tokill_conn;
1333
1334 /* We can't reuse a connection, and e have more FDs than deemd
1335 * acceptable, attempt to kill an idling connection
1336 */
1337 /* First, try from our own idle list */
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001338 tokill_conn = MT_LIST_POP(&srv->idle_conns[tid],
Olivier Houchard88698d92019-04-16 19:07:22 +02001339 struct connection *, list);
1340 if (tokill_conn)
1341 tokill_conn->mux->destroy(tokill_conn->ctx);
1342 /* If not, iterate over other thread's idling pool, and try to grab one */
1343 else {
1344 int i;
1345
Willy Tarreauc35bcfc2020-06-29 14:43:16 +02001346 for (i = tid; (i = ((i + 1 == global.nbthread) ? 0 : i + 1)) != tid;) {
Willy Tarreau08e2b412019-05-26 11:50:08 +02001347 // just silence stupid gcc which reports an absurd
1348 // out-of-bounds warning for <i> which is always
1349 // exactly zero without threads, but it seems to
1350 // see it possibly larger.
1351 ALREADY_CHECKED(i);
1352
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001353 HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001354 tokill_conn = MT_LIST_POP(&srv->idle_conns[i],
Olivier Houchard88698d92019-04-16 19:07:22 +02001355 struct connection *, list);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001356 if (!tokill_conn)
1357 tokill_conn = MT_LIST_POP(&srv->safe_conns[i],
1358 struct connection *, list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001359 if (tokill_conn) {
1360 /* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
1361
Willy Tarreaua9d7b762020-07-10 08:28:20 +02001362 MT_LIST_ADDQ(&idle_conns[i].toremove_conns,
Olivier Houchard859dc802019-08-08 15:47:21 +02001363 (struct mt_list *)&tokill_conn->list);
Willy Tarreau4d82bf52020-06-28 00:19:17 +02001364 task_wakeup(idle_conns[i].cleanup_task, TASK_WOKEN_OTHER);
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001365 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard88698d92019-04-16 19:07:22 +02001366 break;
1367 }
Olivier Houchardf8f4c2e2020-06-29 20:15:59 +02001368 HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
Olivier Houchard88698d92019-04-16 19:07:22 +02001369 }
1370 }
1371
1372 }
Willy Tarreau34601a82013-12-15 16:33:46 +01001373
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001374 if (reuse) {
Willy Tarreaub0821862019-07-18 19:26:11 +02001375 if (srv_conn->mux) {
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001376 int avail = srv_conn->mux->avail_streams(srv_conn);
1377
1378 if (avail <= 1) {
Olivier Houchard2442f682018-12-01 17:03:38 +01001379 /* No more streams available, remove it from the list */
Olivier Houchardf0d4dff2020-03-06 18:12:03 +01001380 MT_LIST_DEL(&srv_conn->list);
Olivier Houchard2442f682018-12-01 17:03:38 +01001381 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001382
1383 if (avail >= 1) {
1384 srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001385 if (srv_cs)
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001386 si_attach_cs(&s->si[1], srv_cs);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001387 else
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001388 srv_conn = NULL;
1389 }
Olivier Houchard134a2042018-12-28 14:45:47 +01001390 else
1391 srv_conn = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001392 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001393 /* otherwise srv_conn is left intact */
1394 }
1395 else
1396 srv_conn = NULL;
1397
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001398skip_reuse:
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001399 /* no reuse or failed to reuse the connection above, pick a new one */
1400 if (!srv_conn) {
Christopher Faulet236c93b2020-07-02 09:19:54 +02001401 srv_conn = conn_new(s->target);
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001402 srv_cs = NULL;
Christopher Fauletc64badd2020-07-01 15:12:43 +02001403
Willy Tarreaudc2ac812020-07-15 17:46:32 +02001404 if (srv_conn) {
1405 srv_conn->owner = s->sess;
Amaury Denoyelle7f68d812021-01-26 14:35:26 +01001406 if (reuse_mode == PR_O_REUSE_NEVR)
Willy Tarreaudc2ac812020-07-15 17:46:32 +02001407 conn_set_private(srv_conn);
1408 }
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001409 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001410
Willy Tarreau9b7587a2020-10-15 07:32:10 +02001411 if (!srv_conn || !sockaddr_alloc(&srv_conn->dst, 0, 0)) {
Olivier Houchardc0caac22020-03-20 14:26:32 +01001412 if (srv_conn)
1413 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001414 return SF_ERR_RESOURCE;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001415 }
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001416
Willy Tarreaue7dff022015-04-03 01:14:29 +02001417 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001418 err = assign_server_address(s);
Olivier Houchardc0caac22020-03-20 14:26:32 +01001419 if (err != SRV_STATUS_OK) {
1420 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001421 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001422 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001423 }
1424
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001425 /* copy the target address into the connection */
1426 *srv_conn->dst = *s->target_addr;
1427
1428 /* Copy network namespace from client connection */
1429 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
1430
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001431 if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001432 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001433 if (srv)
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001434 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001435 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1436 /* proxies exclusively run on raw_sock right now */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001437 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
Olivier Houchardc0caac22020-03-20 14:26:32 +01001438 if (!(srv_conn->ctrl)) {
1439 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001440 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001441 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001442 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001443 else {
1444 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001445 return SF_ERR_INTERNAL; /* how did we get there ? */
Olivier Houchardc0caac22020-03-20 14:26:32 +01001446 }
Willy Tarreaud02394b2012-05-11 18:32:18 +02001447
Olivier Houchard8af03b32020-01-22 17:34:54 +01001448 srv_cs = si_alloc_cs(&s->si[1], srv_conn);
1449 if (!srv_cs) {
1450 conn_free(srv_conn);
1451 return SF_ERR_RESOURCE;
1452 }
1453 srv_conn->ctx = srv_cs;
Olivier Houchardecffb7d2020-01-24 14:10:55 +01001454#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
Olivier Houchard12950162018-11-23 14:32:08 +01001455 if (!srv ||
Christopher Fauletb4de4202020-07-30 09:10:36 +02001456 (srv->use_ssl != 1 || (!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
1457 srv->mux_proto || s->be->mode != PR_MODE_HTTP))
Olivier Houchard201b9f42018-11-21 00:16:29 +01001458#endif
Olivier Houchard5cd62172019-01-04 15:52:26 +01001459 init_mux = 1;
Christopher Faulet08016ab2020-07-01 16:10:06 +02001460
Willy Tarreauff605db2013-12-20 11:09:51 +01001461 /* process the case where the server requires the PROXY protocol to be sent */
1462 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001463
Willy Tarreau7b004922015-08-04 19:34:21 +02001464 if (srv && srv->pp_opts) {
Christopher Faulet21ddc742020-07-01 15:26:14 +02001465 conn_set_private(srv_conn);
Alexander Liu2a54bb72019-05-22 19:44:48 +08001466 srv_conn->flags |= CO_FL_SEND_PROXY;
Willy Tarreauff605db2013-12-20 11:09:51 +01001467 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001468 if (cli_conn)
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001469 conn_get_dst(cli_conn);
Willy Tarreauff605db2013-12-20 11:09:51 +01001470 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001471
Willy Tarreauff605db2013-12-20 11:09:51 +01001472 assign_tproxy_address(s);
Alexander Liu2a54bb72019-05-22 19:44:48 +08001473
1474 if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
1475 srv_conn->send_proxy_ofs = 1;
1476 srv_conn->flags |= CO_FL_SOCKS4;
1477 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001478 }
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001479 else if (!conn_xprt_ready(srv_conn)) {
1480 if (srv_conn->mux->reset)
1481 srv_conn->mux->reset(srv_conn);
1482 }
Olivier Houcharde8f5f5d2019-10-25 17:00:54 +02001483 else {
1484 /* Only consider we're doing reuse if the connection was
1485 * ready.
1486 */
1487 if (srv_conn->mux->ctl(srv_conn, MUX_STATUS, NULL) & MUX_STATUS_READY)
1488 s->flags |= SF_SRV_REUSED;
1489 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001490
William Lallemandb7ff6a32012-03-02 14:35:21 +01001491 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001492 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001493 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001494
Willy Tarreau14f8e862012-08-30 22:23:13 +02001495 /* disable lingering */
1496 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001497 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001498
Willy Tarreauf1573842018-12-14 11:35:36 +01001499 if (s->flags & SF_SRV_REUSED) {
Olivier Houchard237f7812019-03-08 18:49:07 +01001500 _HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001501 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001502 _HA_ATOMIC_ADD(&srv->counters.reuse, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001503 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +01001504 _HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001505 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001506 _HA_ATOMIC_ADD(&srv->counters.connect, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001507 }
1508
Olivier Houchard201b9f42018-11-21 00:16:29 +01001509 err = si_connect(&s->si[1], srv_conn);
Willy Tarreau09e02032019-07-18 16:18:20 +02001510 if (err != SF_ERR_NONE)
1511 return err;
1512
Christopher Faulet27bd6ff2020-07-01 11:00:18 +02001513#ifdef USE_OPENSSL
1514 if (srv && srv->ssl_ctx.sni) {
1515 struct sample *smp;
1516
1517 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
1518 srv->ssl_ctx.sni, SMP_T_STR);
1519 if (smp_make_safe(smp)) {
1520 ssl_sock_set_servername(srv_conn, smp->data.u.str.area);
Amaury Denoyelle7239c242020-10-15 16:41:09 +02001521 if (!(srv->ssl_ctx.sni->fetch->use & SMP_USE_INTRN) ||
1522 smp->flags & SMP_F_VOLATILE) {
1523 conn_set_private(srv_conn);
1524 }
Christopher Faulet27bd6ff2020-07-01 11:00:18 +02001525 }
1526 }
1527#endif /* USE_OPENSSL */
1528
Willy Tarreaua3b17562020-07-31 08:39:31 +02001529 /* The CO_FL_SEND_PROXY flag may have been set by the connect method,
1530 * if so, add our handshake pseudo-XPRT now.
1531 */
1532 if ((srv_conn->flags & CO_FL_HANDSHAKE)) {
1533 if (xprt_add_hs(srv_conn) < 0) {
1534 conn_full_close(srv_conn);
1535 return SF_ERR_INTERNAL;
1536 }
1537 }
1538
Olivier Houchard5cd62172019-01-04 15:52:26 +01001539 /* We have to defer the mux initialization until after si_connect()
1540 * has been called, as we need the xprt to have been properly
1541 * initialized, or any attempt to recv during the mux init may
1542 * fail, and flag the connection as CO_FL_ERROR.
1543 */
1544 if (init_mux) {
Olivier Houchard74931142019-01-29 19:11:16 +01001545 if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
1546 conn_full_close(srv_conn);
Olivier Houchard5cd62172019-01-04 15:52:26 +01001547 return SF_ERR_INTERNAL;
Olivier Houchard74931142019-01-29 19:11:16 +01001548 }
Amaury Denoyelle08d87b32021-01-26 17:35:46 +01001549 if (s->be->mode != PR_MODE_HTTP) {
1550 /* If we're doing http-reuse always, and the connection
1551 * is not private with available streams (an http2
1552 * connection), add it to the available list, so that
1553 * others can use it right away. If the connection is
1554 * private or we're doing http-reuse safe and the mux
1555 * protocol supports multiplexing, add it in the
1556 * session server list.
1557 */
1558 if (srv && reuse_mode == PR_O_REUSE_ALWS &&
1559 !(srv_conn->flags & CO_FL_PRIVATE) &&
1560 srv_conn->mux->avail_streams(srv_conn) > 0) {
1561 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&srv_conn->list));
1562 }
1563 else if (srv_conn->flags & CO_FL_PRIVATE ||
1564 (reuse_mode == PR_O_REUSE_SAFE &&
1565 srv_conn->mux->flags & MX_FL_HOL_RISK)) {
1566 /* If it fail now, the same will be done in mux->detach() callback */
1567 session_add_conn(s->sess, srv_conn, srv_conn->target);
1568 }
Christopher Faulet08016ab2020-07-01 16:10:06 +02001569 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001570 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001571
Willy Tarreau5db847a2019-05-09 14:13:35 +02001572#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
Olivier Houchard4cd2af42019-05-06 15:18:27 +02001573
Olivier Houchard8694e5b2019-06-15 00:14:05 +02001574 if (!reuse && cli_conn && srv && srv_conn->mux &&
Olivier Houchard522eea72017-11-03 16:27:47 +01001575 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
Olivier Houchard865d8392019-05-03 22:46:27 +02001576 /* Only attempt to use early data if either the client sent
1577 * early data, so that we know it can handle a 425, or if
1578 * we are allwoed to retry requests on early data failure, and
1579 * it's our first try
1580 */
1581 ((cli_conn->flags & CO_FL_EARLY_DATA) ||
1582 ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
1583 s->si[1].conn_retries == s->be->conn_retries)) &&
1584 !channel_is_empty(si_oc(&s->si[1])) &&
1585 srv_conn->flags & CO_FL_SSL_WAIT_HS)
Olivier Houchard522eea72017-11-03 16:27:47 +01001586 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001587#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001588
Willy Tarreau14f8e862012-08-30 22:23:13 +02001589 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001590 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001591
Willy Tarreau827aee92011-03-10 16:55:02 +01001592 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001593 int count;
1594
Willy Tarreaue7dff022015-04-03 01:14:29 +02001595 s->flags |= SF_CURR_SESS;
Olivier Houchard237f7812019-03-08 18:49:07 +01001596 count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +02001597 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Christopher Faulet26a52af2020-10-16 16:27:17 +02001598 if (s->be->lbprm.server_take_conn) {
1599 HA_SPIN_LOCK(SERVER_LOCK, &srv->lock);
Willy Tarreau827aee92011-03-10 16:55:02 +01001600 s->be->lbprm.server_take_conn(srv);
Christopher Faulet26a52af2020-10-16 16:27:17 +02001601 HA_SPIN_UNLOCK(SERVER_LOCK, &srv->lock);
1602 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001603 }
1604
Willy Tarreauada4c582020-03-04 16:42:03 +01001605 /* Now handle synchronously connected sockets. We know the stream-int
1606 * is at least in state SI_ST_CON. These ones typically are UNIX
1607 * sockets, socket pairs, and occasionally TCP connections on the
1608 * loopback on a heavily loaded system.
1609 */
1610 if ((srv_conn->flags & CO_FL_ERROR || srv_cs->flags & CS_FL_ERROR))
1611 s->si[1].flags |= SI_FL_ERR;
1612
1613 /* If we had early data, and the handshake ended, then
1614 * we can remove the flag, and attempt to wake the task up,
1615 * in the event there's an analyser waiting for the end of
1616 * the handshake.
1617 */
1618 if (!(srv_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)))
1619 srv_cs->flags &= ~CS_FL_WAIT_FOR_HS;
1620
1621 if (!si_state_in(s->si[1].state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) &&
1622 (srv_conn->flags & CO_FL_WAIT_XPRT) == 0) {
1623 s->si[1].exp = TICK_ETERNITY;
1624 si_oc(&s->si[1])->flags |= CF_WRITE_NULL;
1625 if (s->si[1].state == SI_ST_CON)
1626 s->si[1].state = SI_ST_RDY;
1627 }
1628
1629 /* Report EOI on the channel if it was reached from the mux point of
1630 * view.
1631 *
1632 * Note: This test is only required because si_cs_process is also the SI
1633 * wake callback. Otherwise si_cs_recv()/si_cs_send() already take
1634 * care of it.
1635 */
1636 if ((srv_cs->flags & CS_FL_EOI) && !(si_ic(&s->si[1])->flags & CF_EOI))
1637 si_ic(&s->si[1])->flags |= (CF_EOI|CF_READ_PARTIAL);
1638
Christopher Faulet3f5bcd02020-07-29 22:42:27 +02001639 /* catch all sync connect while the mux is not already installed */
1640 if (!srv_conn->mux && !(srv_conn->flags & CO_FL_WAIT_XPRT)) {
1641 if (conn_create_mux(srv_conn) < 0) {
1642 conn_full_close(srv_conn);
1643 return SF_ERR_INTERNAL;
1644 }
1645 }
1646
Willy Tarreaue7dff022015-04-03 01:14:29 +02001647 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001648}
1649
1650
Willy Tarreaubaaee002006-06-26 02:48:02 +02001651/* This function performs the "redispatch" part of a connection attempt. It
1652 * will assign a server if required, queue the connection if required, and
1653 * handle errors that might arise at this level. It can change the server
1654 * state. It will return 1 if it encounters an error, switches the server
1655 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1656 * that the connection is ready to use.
1657 */
1658
Willy Tarreau87b09662015-04-03 00:22:06 +02001659int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001660{
Willy Tarreau827aee92011-03-10 16:55:02 +01001661 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001662 int conn_err;
1663
1664 /* We know that we don't have any connection pending, so we will
1665 * try to get a new one, and wait in this state if it's queued
1666 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001667 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001668 conn_err = assign_server_and_queue(s);
1669 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001670
Willy Tarreaubaaee002006-06-26 02:48:02 +02001671 switch (conn_err) {
1672 case SRV_STATUS_OK:
1673 break;
1674
Willy Tarreau7c669d72008-06-20 15:04:11 +02001675 case SRV_STATUS_FULL:
1676 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1677 * and we can redispatch to another server, or it is not and we return
1678 * 503. This only makes sense in DIRECT mode however, because normal LB
1679 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001680 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001681 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001682 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001683 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001684 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001685 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001686 sockaddr_free(&s->target_addr);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001687 goto redispatch;
1688 }
1689
Willy Tarreau350f4872014-11-28 14:42:25 +01001690 if (!s->si[1].err_type) {
1691 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001692 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001693
Olivier Houchard237f7812019-03-08 18:49:07 +01001694 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1695 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001696 return 1;
1697
Willy Tarreaubaaee002006-06-26 02:48:02 +02001698 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001699 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001700 if (!s->si[1].err_type) {
1701 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001702 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001703
Olivier Houchard237f7812019-03-08 18:49:07 +01001704 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001705 return 1;
1706
1707 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001708 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1709 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001710 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001711 return 1;
1712
Willy Tarreaubaaee002006-06-26 02:48:02 +02001713 case SRV_STATUS_INTERNAL:
1714 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001715 if (!s->si[1].err_type) {
1716 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001717 }
1718
Willy Tarreau827aee92011-03-10 16:55:02 +01001719 if (srv)
1720 srv_inc_sess_ctr(srv);
1721 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001722 srv_set_sess_last(srv);
1723 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001724 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1725 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001726
Willy Tarreau87b09662015-04-03 00:22:06 +02001727 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001728 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001729 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001730 return 1;
1731 }
1732 /* if we get here, it's because we got SRV_STATUS_OK, which also
1733 * means that the connection has not been queued.
1734 */
1735 return 0;
1736}
1737
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001738/* Check if the connection request is in such a state that it can be aborted. */
1739static int back_may_abort_req(struct channel *req, struct stream *s)
1740{
1741 return ((req->flags & (CF_READ_ERROR)) ||
1742 ((req->flags & (CF_SHUTW_NOW|CF_SHUTW)) && /* empty and client aborted */
1743 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE))));
1744}
1745
1746/* Update back stream interface status for input states SI_ST_ASS, SI_ST_QUE,
1747 * SI_ST_TAR. Other input states are simply ignored.
1748 * Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON
1749 * and SI_ST_EST. Flags must have previously been updated for timeouts and other
1750 * conditions.
1751 */
1752void back_try_conn_req(struct stream *s)
1753{
1754 struct server *srv = objt_server(s->target);
1755 struct stream_interface *si = &s->si[1];
1756 struct channel *req = &s->req;
1757
1758 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1759
1760 if (si->state == SI_ST_ASS) {
1761 /* Server assigned to connection request, we have to try to connect now */
1762 int conn_err;
1763
1764 /* Before we try to initiate the connection, see if the
1765 * request may be aborted instead.
1766 */
1767 if (back_may_abort_req(req, s)) {
1768 si->err_type |= SI_ET_CONN_ABRT;
1769 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1770 goto abort_connection;
1771 }
1772
1773 conn_err = connect_server(s);
1774 srv = objt_server(s->target);
1775
1776 if (conn_err == SF_ERR_NONE) {
1777 /* state = SI_ST_CON or SI_ST_EST now */
1778 if (srv)
1779 srv_inc_sess_ctr(srv);
1780 if (srv)
1781 srv_set_sess_last(srv);
1782 DBG_TRACE_STATE("connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1783 goto end;
1784 }
1785
1786 /* We have received a synchronous error. We might have to
1787 * abort, retry immediately or redispatch.
1788 */
1789 if (conn_err == SF_ERR_INTERNAL) {
1790 if (!si->err_type) {
1791 si->err_type = SI_ET_CONN_OTHER;
1792 }
1793
1794 if (srv)
1795 srv_inc_sess_ctr(srv);
1796 if (srv)
1797 srv_set_sess_last(srv);
1798 if (srv)
1799 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1800 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1801
1802 /* release other streams waiting for this server */
1803 sess_change_server(s, NULL);
1804 if (may_dequeue_tasks(srv, s->be))
1805 process_srv_queue(srv);
1806
1807 /* Failed and not retryable. */
1808 si_shutr(si);
1809 si_shutw(si);
1810 req->flags |= CF_WRITE_ERROR;
1811
1812 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1813
1814 /* we may need to know the position in the queue for logging */
1815 pendconn_cond_unlink(s->pend_pos);
1816
1817 /* no stream was ever accounted for this server */
1818 si->state = SI_ST_CLO;
1819 if (s->srv_error)
1820 s->srv_error(s, si);
1821 DBG_TRACE_STATE("internal error during connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1822 goto end;
1823 }
1824
1825 /* We are facing a retryable error, but we don't want to run a
1826 * turn-around now, as the problem is likely a source port
1827 * allocation problem, so we want to retry now.
1828 */
1829 si->state = SI_ST_CER;
1830 si->flags &= ~SI_FL_ERR;
1831 back_handle_st_cer(s);
1832
1833 DBG_TRACE_STATE("connection error, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1834 /* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
1835 }
1836 else if (si->state == SI_ST_QUE) {
1837 /* connection request was queued, check for any update */
1838 if (!pendconn_dequeue(s)) {
1839 /* The connection is not in the queue anymore. Either
1840 * we have a server connection slot available and we
1841 * go directly to the assigned state, or we need to
1842 * load-balance first and go to the INI state.
1843 */
1844 si->exp = TICK_ETERNITY;
1845 if (unlikely(!(s->flags & SF_ASSIGNED)))
1846 si->state = SI_ST_REQ;
1847 else {
1848 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1849 si->state = SI_ST_ASS;
1850 }
1851 DBG_TRACE_STATE("dequeue connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1852 goto end;
1853 }
1854
1855 /* Connection request still in queue... */
1856 if (si->flags & SI_FL_EXP) {
1857 /* ... and timeout expired */
1858 si->exp = TICK_ETERNITY;
1859 si->flags &= ~SI_FL_EXP;
1860 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1861
1862 /* we may need to know the position in the queue for logging */
1863 pendconn_cond_unlink(s->pend_pos);
1864
1865 if (srv)
1866 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1867 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1868 si_shutr(si);
1869 si_shutw(si);
1870 req->flags |= CF_WRITE_TIMEOUT;
1871 if (!si->err_type)
1872 si->err_type = SI_ET_QUEUE_TO;
1873 si->state = SI_ST_CLO;
1874 if (s->srv_error)
1875 s->srv_error(s, si);
1876 DBG_TRACE_STATE("connection request still queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1877 goto end;
1878 }
1879
1880 /* Connection remains in queue, check if we have to abort it */
1881 if (back_may_abort_req(req, s)) {
1882 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1883
1884 /* we may need to know the position in the queue for logging */
1885 pendconn_cond_unlink(s->pend_pos);
1886
1887 si->err_type |= SI_ET_QUEUE_ABRT;
1888 DBG_TRACE_STATE("abort queued connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1889 goto abort_connection;
1890 }
1891
1892 /* Nothing changed */
1893 }
1894 else if (si->state == SI_ST_TAR) {
1895 /* Connection request might be aborted */
1896 if (back_may_abort_req(req, s)) {
1897 si->err_type |= SI_ET_CONN_ABRT;
1898 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1899 goto abort_connection;
1900 }
1901
1902 if (!(si->flags & SI_FL_EXP))
1903 return; /* still in turn-around */
1904
1905 si->flags &= ~SI_FL_EXP;
1906 si->exp = TICK_ETERNITY;
1907
1908 /* we keep trying on the same server as long as the stream is
1909 * marked "assigned".
1910 * FIXME: Should we force a redispatch attempt when the server is down ?
1911 */
1912 if (s->flags & SF_ASSIGNED)
1913 si->state = SI_ST_ASS;
1914 else
1915 si->state = SI_ST_REQ;
1916
1917 DBG_TRACE_STATE("retry connection now", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1918 }
1919
1920 end:
1921 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1922 return;
1923
1924abort_connection:
1925 /* give up */
1926 si->exp = TICK_ETERNITY;
1927 si->flags &= ~SI_FL_EXP;
1928 si_shutr(si);
1929 si_shutw(si);
1930 si->state = SI_ST_CLO;
1931 if (s->srv_error)
1932 s->srv_error(s, si);
1933 DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1934 return;
1935}
1936
1937/* This function initiates a server connection request on a stream interface
1938 * already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS for
1939 * a real connection to a server, indicating that a server has been assigned,
1940 * or SI_ST_EST for a successful connection to an applet. It may also return
1941 * SI_ST_QUE, or SI_ST_CLO upon error.
1942 */
1943void back_handle_st_req(struct stream *s)
1944{
1945 struct stream_interface *si = &s->si[1];
1946
1947 if (si->state != SI_ST_REQ)
1948 return;
1949
1950 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1951
1952 if (unlikely(obj_type(s->target) == OBJ_TYPE_APPLET)) {
1953 /* the applet directly goes to the EST state */
1954 struct appctx *appctx = objt_appctx(si->end);
1955
1956 if (!appctx || appctx->applet != __objt_applet(s->target))
1957 appctx = si_register_handler(si, objt_applet(s->target));
1958
1959 if (!appctx) {
1960 /* No more memory, let's immediately abort. Force the
1961 * error code to ignore the ERR_LOCAL which is not a
1962 * real error.
1963 */
1964 s->flags &= ~(SF_ERR_MASK | SF_FINST_MASK);
1965
1966 si_shutr(si);
1967 si_shutw(si);
1968 s->req.flags |= CF_WRITE_ERROR;
1969 si->err_type = SI_ET_CONN_RES;
1970 si->state = SI_ST_CLO;
1971 if (s->srv_error)
1972 s->srv_error(s, si);
1973 DBG_TRACE_STATE("failed to register applet", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1974 goto end;
1975 }
1976
1977 if (tv_iszero(&s->logs.tv_request))
1978 s->logs.tv_request = now;
1979 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1980 si->state = SI_ST_EST;
1981 si->err_type = SI_ET_NONE;
1982 be_set_sess_last(s->be);
1983
1984 DBG_TRACE_STATE("applet registered", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1985 /* let back_establish() finish the job */
1986 goto end;
1987 }
1988
1989 /* Try to assign a server */
1990 if (srv_redispatch_connect(s) != 0) {
1991 /* We did not get a server. Either we queued the
1992 * connection request, or we encountered an error.
1993 */
1994 if (si->state == SI_ST_QUE) {
1995 DBG_TRACE_STATE("connection request queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1996 goto end;
1997 }
1998
1999 /* we did not get any server, let's check the cause */
2000 si_shutr(si);
2001 si_shutw(si);
2002 s->req.flags |= CF_WRITE_ERROR;
2003 if (!si->err_type)
2004 si->err_type = SI_ET_CONN_OTHER;
2005 si->state = SI_ST_CLO;
2006 if (s->srv_error)
2007 s->srv_error(s, si);
2008 DBG_TRACE_STATE("connection request failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2009 goto end;
2010 }
2011
2012 /* The server is assigned */
2013 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
2014 si->state = SI_ST_ASS;
2015 be_set_sess_last(s->be);
2016 DBG_TRACE_STATE("connection request assigned to a server", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2017
2018 end:
2019 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2020}
2021
2022/* This function is called with (si->state == SI_ST_CON) meaning that a
2023 * connection was attempted and that the file descriptor is already allocated.
2024 * We must check for timeout, error and abort. Possible output states are
2025 * SI_ST_CER (error), SI_ST_DIS (abort), and SI_ST_CON (no change). This only
2026 * works with connection-based streams. We know that there were no I/O event
2027 * when reaching this function. Timeouts and errors are *not* cleared.
2028 */
2029void back_handle_st_con(struct stream *s)
2030{
2031 struct stream_interface *si = &s->si[1];
2032 struct channel *req = &s->req;
2033 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002034
2035 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2036
2037 /* the client might want to abort */
2038 if ((rep->flags & CF_SHUTW) ||
2039 ((req->flags & CF_SHUTW_NOW) &&
2040 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2041 si->flags |= SI_FL_NOLINGER;
2042 si_shutw(si);
2043 si->err_type |= SI_ET_CONN_ABRT;
2044 if (s->srv_error)
2045 s->srv_error(s, si);
2046 /* Note: state = SI_ST_DIS now */
2047 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 +01002048 goto end;
2049 }
2050
Willy Tarreau062df2c2020-01-10 06:17:03 +01002051 done:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002052 /* retryable error ? */
Willy Tarreau062df2c2020-01-10 06:17:03 +01002053 if (si->flags & (SI_FL_EXP|SI_FL_ERR)) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002054 if (!si->err_type) {
2055 if (si->flags & SI_FL_ERR)
2056 si->err_type = SI_ET_CONN_ERR;
2057 else
2058 si->err_type = SI_ET_CONN_TO;
2059 }
2060
2061 si->state = SI_ST_CER;
2062 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2063 }
2064
Willy Tarreau062df2c2020-01-10 06:17:03 +01002065 end:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002066 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2067}
2068
2069/* This function is called with (si->state == SI_ST_CER) meaning that a
2070 * previous connection attempt has failed and that the file descriptor
2071 * has already been released. Possible causes include asynchronous error
2072 * notification and time out. Possible output states are SI_ST_CLO when
2073 * retries are exhausted, SI_ST_TAR when a delay is wanted before a new
2074 * connection attempt, SI_ST_ASS when it's wise to retry on the same server,
2075 * and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
2076 * marked as in error state. Timeouts and errors are cleared before retrying.
2077 */
2078void back_handle_st_cer(struct stream *s)
2079{
2080 struct stream_interface *si = &s->si[1];
2081 struct conn_stream *cs = objt_cs(si->end);
2082 struct connection *conn = cs_conn(cs);
2083
2084 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2085
2086 si->exp = TICK_ETERNITY;
2087 si->flags &= ~SI_FL_EXP;
2088
2089 /* we probably have to release last stream from the server */
2090 if (objt_server(s->target)) {
2091 health_adjust(objt_server(s->target), HANA_STATUS_L4_ERR);
2092
2093 if (s->flags & SF_CURR_SESS) {
2094 s->flags &= ~SF_CURR_SESS;
2095 _HA_ATOMIC_SUB(&__objt_server(s->target)->cur_sess, 1);
2096 }
2097
2098 if ((si->flags & SI_FL_ERR) &&
2099 conn && conn->err_code == CO_ER_SSL_MISMATCH_SNI) {
2100 /* We tried to connect to a server which is configured
2101 * with "verify required" and which doesn't have the
2102 * "verifyhost" directive. The server presented a wrong
2103 * certificate (a certificate for an unexpected name),
2104 * which implies that we have used SNI in the handshake,
2105 * and that the server doesn't have the associated cert
2106 * and presented a default one.
2107 *
2108 * This is a serious enough issue not to retry. It's
2109 * especially important because this wrong name might
2110 * either be the result of a configuration error, and
2111 * retrying will only hammer the server, or is caused
2112 * by the use of a wrong SNI value, most likely
2113 * provided by the client and we don't want to let the
2114 * client provoke retries.
2115 */
2116 si->conn_retries = 0;
2117 DBG_TRACE_DEVEL("Bad SSL cert, disable connection retries", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2118 }
2119 }
2120
2121 /* ensure that we have enough retries left */
2122 si->conn_retries--;
2123 if (si->conn_retries < 0 || !(s->be->retry_type & PR_RE_CONN_FAILED)) {
2124 if (!si->err_type) {
2125 si->err_type = SI_ET_CONN_ERR;
2126 }
2127
2128 if (objt_server(s->target))
2129 _HA_ATOMIC_ADD(&objt_server(s->target)->counters.failed_conns, 1);
2130 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
2131 sess_change_server(s, NULL);
2132 if (may_dequeue_tasks(objt_server(s->target), s->be))
2133 process_srv_queue(objt_server(s->target));
2134
2135 /* shutw is enough so stop a connecting socket */
2136 si_shutw(si);
2137 s->req.flags |= CF_WRITE_ERROR;
2138 s->res.flags |= CF_READ_ERROR;
2139
2140 si->state = SI_ST_CLO;
2141 if (s->srv_error)
2142 s->srv_error(s, si);
2143
2144 DBG_TRACE_STATE("connection failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2145 goto end;
2146 }
2147
2148 stream_choose_redispatch(s);
2149
2150 if (si->flags & SI_FL_ERR) {
2151 /* The error was an asynchronous connection error, and we will
2152 * likely have to retry connecting to the same server, most
2153 * likely leading to the same result. To avoid this, we wait
2154 * MIN(one second, connect timeout) before retrying. We don't
2155 * do it when the failure happened on a reused connection
2156 * though.
2157 */
2158
2159 int delay = 1000;
2160
2161 if (s->be->timeout.connect && s->be->timeout.connect < delay)
2162 delay = s->be->timeout.connect;
2163
2164 if (!si->err_type)
2165 si->err_type = SI_ET_CONN_ERR;
2166
2167 /* only wait when we're retrying on the same server */
2168 if ((si->state == SI_ST_ASS ||
2169 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_RR ||
2170 (s->be->srv_act <= 1)) && !(s->flags & SF_SRV_REUSED)) {
2171 si->state = SI_ST_TAR;
2172 si->exp = tick_add(now_ms, MS_TO_TICKS(delay));
2173 }
2174 si->flags &= ~SI_FL_ERR;
2175 DBG_TRACE_STATE("retry a new connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2176 }
2177
2178 end:
2179 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2180}
2181
2182/* This function is called with (si->state == SI_ST_RDY) meaning that a
2183 * connection was attempted, that the file descriptor is already allocated,
2184 * and that it has succeeded. We must still check for errors and aborts.
2185 * Possible output states are SI_ST_EST (established), SI_ST_CER (error),
2186 * and SI_ST_DIS (abort). This only works with connection-based streams.
2187 * Timeouts and errors are *not* cleared.
2188 */
2189void back_handle_st_rdy(struct stream *s)
2190{
2191 struct stream_interface *si = &s->si[1];
2192 struct channel *req = &s->req;
2193 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002194
2195 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2196 /* We know the connection at least succeeded, though it could have
2197 * since met an error for any other reason. At least it didn't time out
Thayne McCombs8f0cc5c2021-01-07 21:35:52 -07002198 * even though the timeout might have been reported right after success.
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002199 * We need to take care of various situations here :
2200 * - everything might be OK. We have to switch to established.
2201 * - an I/O error might have been reported after a successful transfer,
2202 * which is not retryable and needs to be logged correctly, and needs
2203 * established as well
2204 * - SI_ST_CON implies !CF_WROTE_DATA but not conversely as we could
2205 * have validated a connection with incoming data (e.g. TCP with a
2206 * banner protocol), or just a successful connect() probe.
2207 * - the client might have requested a connection abort, this needs to
2208 * be checked before we decide to retry anything.
2209 */
2210
2211 /* it's still possible to handle client aborts or connection retries
2212 * before any data were sent.
2213 */
2214 if (!(req->flags & CF_WROTE_DATA)) {
2215 /* client abort ? */
2216 if ((rep->flags & CF_SHUTW) ||
2217 ((req->flags & CF_SHUTW_NOW) &&
2218 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2219 /* give up */
2220 si->flags |= SI_FL_NOLINGER;
2221 si_shutw(si);
2222 si->err_type |= SI_ET_CONN_ABRT;
2223 if (s->srv_error)
2224 s->srv_error(s, si);
2225 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2226 goto end;
2227 }
2228
2229 /* retryable error ? */
2230 if (si->flags & SI_FL_ERR) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002231 if (!si->err_type)
2232 si->err_type = SI_ET_CONN_ERR;
2233 si->state = SI_ST_CER;
2234 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2235 goto end;
2236 }
2237 }
2238
2239 /* data were sent and/or we had no error, back_establish() will
2240 * now take over.
2241 */
2242 DBG_TRACE_STATE("connection established", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2243 si->err_type = SI_ET_NONE;
2244 si->state = SI_ST_EST;
2245
2246 end:
2247 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2248}
2249
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002250/* sends a log message when a backend goes down, and also sets last
2251 * change date.
2252 */
2253void set_backend_down(struct proxy *be)
2254{
2255 be->last_change = now.tv_sec;
Olivier Houchard237f7812019-03-08 18:49:07 +01002256 _HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002257
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002258 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01002259 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002260 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
2261 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002262}
2263
Willy Tarreau87b09662015-04-03 00:22:06 +02002264/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002265 * tries to extract an RDP cookie from the request buffer, and look for the
2266 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02002267 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002268 * list. Nothing is performed if a server was already assigned.
2269 */
Willy Tarreau87b09662015-04-03 00:22:06 +02002270int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002271{
2272 struct proxy *px = s->be;
2273 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02002274 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002275 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01002276 uint16_t port;
2277 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002278 char *p;
2279
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002280 DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002281
Willy Tarreaue7dff022015-04-03 01:14:29 +02002282 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002283 goto no_cookie;
2284
Willy Tarreau37406352012-04-23 16:16:37 +02002285 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002286
Willy Tarreaucadd8c92013-07-22 18:09:52 +02002287 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002288 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002289 goto no_cookie;
2290
Willy Tarreau04276f32017-01-06 17:41:29 +01002291 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
2292 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
2293 * server's IP address in network order, and "port" is the integer corresponding to the
2294 * server's port in network order. Comments please Emeric.
2295 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002296 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002297 if (*p != '.')
2298 goto no_cookie;
2299 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01002300
2301 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002302 if (*p != '.')
2303 goto no_cookie;
2304
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002305 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002306 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02002307 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01002308 port == srv->svc_port &&
2309 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002310 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002311 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02002312 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002313 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002314 break;
2315 }
2316 }
2317 srv = srv->next;
2318 }
2319
2320no_cookie:
2321 req->analysers &= ~an_bit;
2322 req->analyse_exp = TICK_ETERNITY;
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002323 DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002324 return 1;
2325}
2326
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002327int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01002328 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002329 return px->down_time;
2330
2331 return now.tv_sec - px->last_change + px->down_time;
2332}
Willy Tarreaubaaee002006-06-26 02:48:02 +02002333
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002334/*
2335 * This function returns a string containing the balancing
2336 * mode of the proxy in a format suitable for stats.
2337 */
2338
2339const char *backend_lb_algo_str(int algo) {
2340
2341 if (algo == BE_LB_ALGO_RR)
2342 return "roundrobin";
2343 else if (algo == BE_LB_ALGO_SRR)
2344 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01002345 else if (algo == BE_LB_ALGO_FAS)
2346 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002347 else if (algo == BE_LB_ALGO_LC)
2348 return "leastconn";
2349 else if (algo == BE_LB_ALGO_SH)
2350 return "source";
2351 else if (algo == BE_LB_ALGO_UH)
2352 return "uri";
2353 else if (algo == BE_LB_ALGO_PH)
2354 return "url_param";
2355 else if (algo == BE_LB_ALGO_HH)
2356 return "hdr";
2357 else if (algo == BE_LB_ALGO_RCH)
2358 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002359 else if (algo == BE_LB_ALGO_NONE)
2360 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002361 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002362 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002363}
2364
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002365/* This function parses a "balance" statement in a backend section describing
2366 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002367 * returns -1, it will write an error message into the <err> buffer which will
2368 * automatically be allocated and must be passed as NULL. The trailing '\n'
2369 * will not be written. The function must be called with <args> pointing to the
2370 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002371 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002372int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002373{
2374 if (!*(args[0])) {
2375 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01002376 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2377 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002378 return 0;
2379 }
2380
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002381 if (strcmp(args[0], "roundrobin") == 0) {
Willy Tarreau31682232007-11-29 15:38:04 +01002382 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2383 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002384 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002385 else if (strcmp(args[0], "static-rr") == 0) {
Willy Tarreau9757a382009-10-03 12:56:50 +02002386 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2387 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
2388 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002389 else if (strcmp(args[0], "first") == 0) {
Willy Tarreauf09c6602012-02-13 17:12:08 +01002390 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2391 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
2392 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002393 else if (strcmp(args[0], "leastconn") == 0) {
Willy Tarreau51406232008-03-10 22:04:20 +01002394 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2395 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
2396 }
Willy Tarreau21c741a2019-01-14 18:14:27 +01002397 else if (!strncmp(args[0], "random", 6)) {
Willy Tarreau760e81d2018-05-03 07:20:40 +02002398 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2399 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
Willy Tarreau21c741a2019-01-14 18:14:27 +01002400 curproxy->lbprm.arg_opt1 = 2;
2401
2402 if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
2403 const char *beg;
2404 char *end;
2405
2406 beg = args[0] + 7;
2407 curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
2408
2409 if (*end != ')') {
2410 if (!*end)
2411 memprintf(err, "random : missing closing parenthesis.");
2412 else
2413 memprintf(err, "random : unexpected character '%c' after argument.", *end);
2414 return -1;
2415 }
2416
2417 if (curproxy->lbprm.arg_opt1 < 1) {
2418 memprintf(err, "random : number of draws must be at least 1.");
2419 return -1;
2420 }
2421 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02002422 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002423 else if (strcmp(args[0], "source") == 0) {
Willy Tarreau31682232007-11-29 15:38:04 +01002424 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2425 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002426 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002427 else if (strcmp(args[0], "uri") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002428 int arg = 1;
2429
Willy Tarreau31682232007-11-29 15:38:04 +01002430 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2431 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Willy Tarreau57a37412020-09-23 08:56:29 +02002432 curproxy->lbprm.arg_opt1 = 0; // "whole", "path-only"
Willy Tarreaua9a72492019-01-14 16:14:15 +01002433 curproxy->lbprm.arg_opt2 = 0; // "len"
2434 curproxy->lbprm.arg_opt3 = 0; // "depth"
Oskar Stolc8dc41842012-05-19 10:19:54 +01002435
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002436 while (*args[arg]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002437 if (strcmp(args[arg], "len") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002438 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002439 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002440 return -1;
2441 }
Willy Tarreaua9a72492019-01-14 16:14:15 +01002442 curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002443 arg += 2;
2444 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002445 else if (strcmp(args[arg], "depth") == 0) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002446 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002447 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002448 return -1;
2449 }
2450 /* hint: we store the position of the ending '/' (depth+1) so
2451 * that we avoid a comparison while computing the hash.
2452 */
Willy Tarreaua9a72492019-01-14 16:14:15 +01002453 curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002454 arg += 2;
2455 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002456 else if (strcmp(args[arg], "whole") == 0) {
Willy Tarreau3d1119d2020-09-23 08:05:47 +02002457 curproxy->lbprm.arg_opt1 |= 1;
Oskar Stolc8dc41842012-05-19 10:19:54 +01002458 arg += 1;
2459 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002460 else if (strcmp(args[arg], "path-only") == 0) {
Willy Tarreau57a37412020-09-23 08:56:29 +02002461 curproxy->lbprm.arg_opt1 |= 2;
2462 arg += 1;
2463 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002464 else {
Willy Tarreau57a37412020-09-23 08:56:29 +02002465 memprintf(err, "%s only accepts parameters 'len', 'depth', 'path-only', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002466 return -1;
2467 }
2468 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002469 }
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002470 else if (strcmp(args[0], "url_param") == 0) {
Willy Tarreau01732802007-11-01 22:48:15 +01002471 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002472 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01002473 return -1;
2474 }
Willy Tarreau31682232007-11-29 15:38:04 +01002475 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2476 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02002477
Willy Tarreau4c03d1c2019-01-14 15:23:54 +01002478 free(curproxy->lbprm.arg_str);
2479 curproxy->lbprm.arg_str = strdup(args[1]);
2480 curproxy->lbprm.arg_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002481 if (*args[2]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002482 if (strcmp(args[2], "check_post") != 0) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002483 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002484 return -1;
2485 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002486 }
Benoitaffb4812009-03-25 13:02:10 +01002487 }
2488 else if (!strncmp(args[0], "hdr(", 4)) {
2489 const char *beg, *end;
2490
2491 beg = args[0] + 4;
2492 end = strchr(beg, ')');
2493
2494 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002495 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01002496 return -1;
2497 }
2498
2499 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2500 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
2501
Willy Tarreau484ff072019-01-14 15:28:53 +01002502 free(curproxy->lbprm.arg_str);
2503 curproxy->lbprm.arg_len = end - beg;
2504 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
Willy Tarreau9fed8582019-01-14 16:04:54 +01002505 curproxy->lbprm.arg_opt1 = 0;
Benoitaffb4812009-03-25 13:02:10 +01002506
2507 if (*args[1]) {
Tim Duesterhuse5ff1412021-01-02 22:31:53 +01002508 if (strcmp(args[1], "use_domain_only") != 0) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002509 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01002510 return -1;
2511 }
Willy Tarreau9fed8582019-01-14 16:04:54 +01002512 curproxy->lbprm.arg_opt1 = 1;
Benoitaffb4812009-03-25 13:02:10 +01002513 }
Emeric Brun736aa232009-06-30 17:56:00 +02002514 }
2515 else if (!strncmp(args[0], "rdp-cookie", 10)) {
2516 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2517 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
2518
2519 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
2520 const char *beg, *end;
2521
2522 beg = args[0] + 11;
2523 end = strchr(beg, ')');
2524
2525 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002526 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002527 return -1;
2528 }
2529
Willy Tarreau484ff072019-01-14 15:28:53 +01002530 free(curproxy->lbprm.arg_str);
2531 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
2532 curproxy->lbprm.arg_len = end - beg;
Emeric Brun736aa232009-06-30 17:56:00 +02002533 }
2534 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
Willy Tarreau484ff072019-01-14 15:28:53 +01002535 free(curproxy->lbprm.arg_str);
2536 curproxy->lbprm.arg_str = strdup("mstshash");
2537 curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
Emeric Brun736aa232009-06-30 17:56:00 +02002538 }
2539 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002540 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002541 return -1;
2542 }
Willy Tarreau01732802007-11-01 22:48:15 +01002543 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002544 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002545 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 +01002546 return -1;
2547 }
2548 return 0;
2549}
2550
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002551
2552/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002553/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002554/************************************************************************/
2555
Willy Tarreau34db1082012-04-19 17:16:54 +02002556/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002557 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002558 * undefined behaviour.
2559 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002560static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002561smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002562{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002563 struct proxy *px;
2564
Willy Tarreau37406352012-04-23 16:16:37 +02002565 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002566 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002567 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002568
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002569 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002570
2571 return 1;
2572}
2573
Willy Tarreau37406352012-04-23 16:16:37 +02002574/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002575 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02002576 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2577 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002578 */
2579static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002580smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002581{
Willy Tarreau24e32d82012-04-23 23:55:44 +02002582 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002583
Willy Tarreau37406352012-04-23 16:16:37 +02002584 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002585 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02002586 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
2587 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002588 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002589 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002590 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002591 return 1;
2592}
2593
Willy Tarreau34db1082012-04-19 17:16:54 +02002594/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002595 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002596 * undefined behaviour.
2597 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002598static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002599smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002600{
2601 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02002602
Willy Tarreau37406352012-04-23 16:16:37 +02002603 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002604 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002605 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002606
Willy Tarreau24e32d82012-04-23 23:55:44 +02002607 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002608 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002609 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002610
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002611 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01002612 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002613 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002614 return 1;
2615 }
2616
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002617 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02002618 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002619 }
2620
2621 return 1;
2622}
2623
Willy Tarreaua5e37562011-12-16 17:06:15 +01002624/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002625static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002626smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002627{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002628 struct proxy *px = NULL;
2629
2630 if (smp->strm)
2631 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002632 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002633 px = __objt_check(smp->sess->origin)->proxy;
2634 if (!px)
Willy Tarreaube508f12016-03-10 11:47:01 +01002635 return 0;
2636
Willy Tarreauf853c462012-04-23 18:53:56 +02002637 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002638 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002639 smp->data.u.sint = px->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002640 return 1;
2641}
2642
Marcin Deranekd2471c22016-12-12 14:08:05 +01002643/* set string to the name of the backend */
2644static int
2645smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2646{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002647 struct proxy *px = NULL;
2648
2649 if (smp->strm)
2650 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002651 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002652 px = __objt_check(smp->sess->origin)->proxy;
2653 if (!px)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002654 return 0;
2655
Christopher Fauletd1b44642020-04-30 09:51:15 +02002656 smp->data.u.str.area = (char *)px->id;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002657 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002658 return 0;
2659
2660 smp->data.type = SMP_T_STR;
2661 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002662 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01002663
2664 return 1;
2665}
2666
Willy Tarreaua5e37562011-12-16 17:06:15 +01002667/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002668static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002669smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002670{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002671 struct server *srv = NULL;
Willy Tarreaube508f12016-03-10 11:47:01 +01002672
Christopher Fauletd1b44642020-04-30 09:51:15 +02002673 if (smp->strm)
2674 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002675 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002676 srv = __objt_check(smp->sess->origin)->server;
2677 if (!srv)
Willy Tarreau17af4192011-02-23 14:27:06 +01002678 return 0;
2679
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002680 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002681 smp->data.u.sint = srv->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002682
2683 return 1;
2684}
2685
vkill1dfd1652019-10-30 16:58:14 +08002686/* set string to the name of the server */
2687static int
2688smp_fetch_srv_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2689{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002690 struct server *srv = NULL;
vkill1dfd1652019-10-30 16:58:14 +08002691
Christopher Fauletd1b44642020-04-30 09:51:15 +02002692 if (smp->strm)
2693 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002694 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002695 srv = __objt_check(smp->sess->origin)->server;
2696 if (!srv)
vkill1dfd1652019-10-30 16:58:14 +08002697 return 0;
2698
Christopher Fauletd1b44642020-04-30 09:51:15 +02002699 smp->data.u.str.area = srv->id;
vkill1dfd1652019-10-30 16:58:14 +08002700 if (!smp->data.u.str.area)
2701 return 0;
2702
2703 smp->data.type = SMP_T_STR;
2704 smp->data.u.str.data = strlen(smp->data.u.str.area);
2705
2706 return 1;
2707}
2708
Willy Tarreau34db1082012-04-19 17:16:54 +02002709/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002710 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002711 * undefined behaviour.
2712 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002713static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002714smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002715{
Willy Tarreau37406352012-04-23 16:16:37 +02002716 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002717 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002718 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002719 return 1;
2720}
2721
Willy Tarreau34db1082012-04-19 17:16:54 +02002722/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002723 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002724 * undefined behaviour.
2725 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002726static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002727smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002728{
Willy Tarreau37406352012-04-23 16:16:37 +02002729 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002730 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002731 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02002732 return 1;
2733}
2734
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002735/* set temp integer to the number of available connections across available
2736 * servers on the backend.
2737 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
2738 * undefined behaviour.
2739 */
2740static int
2741smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2742{
2743 struct server *iterator;
2744 struct proxy *px;
2745 unsigned int maxconn;
2746
2747 smp->flags = SMP_F_VOL_TEST;
2748 smp->data.type = SMP_T_SINT;
2749 smp->data.u.sint = 0;
2750
2751 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
2752 if (iterator->cur_state == SRV_ST_STOPPED)
2753 continue;
2754
2755 px = iterator->proxy;
2756 if (!srv_currently_usable(iterator) ||
2757 ((iterator->flags & SRV_F_BACKUP) &&
2758 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
2759 continue;
2760
2761 if (iterator->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(iterator);
2768 if (maxconn > iterator->cur_sess)
2769 smp->data.u.sint += maxconn - iterator->cur_sess;
2770 }
2771
2772 return 1;
2773}
2774
Willy Tarreau34db1082012-04-19 17:16:54 +02002775/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002776 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002777 * undefined behaviour.
2778 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002779static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002780smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002781{
Willy Tarreau37406352012-04-23 16:16:37 +02002782 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002783 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002784 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02002785 return 1;
2786}
2787
Willy Tarreaua5e37562011-12-16 17:06:15 +01002788/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02002789 * by the number of running servers and rounded up. If there is no running
2790 * server, we return twice the total, just as if we had half a running server.
2791 * This is more or less correct anyway, since we expect the last server to come
2792 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002793 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002794 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02002795 */
2796static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002797smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002798{
2799 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002800 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02002801
Willy Tarreau37406352012-04-23 16:16:37 +02002802 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002803 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002804 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02002805
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002806 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02002807
2808 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002809 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02002810 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002811 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02002812
2813 return 1;
2814}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002815
Willy Tarreau34db1082012-04-19 17:16:54 +02002816/* set temp integer to the number of concurrent connections on the server in the backend.
2817 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2818 * undefined behaviour.
2819 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002820static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002821smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002822{
Willy Tarreauf853c462012-04-23 18:53:56 +02002823 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002824 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002825 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002826 return 1;
2827}
2828
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002829/* set temp integer to the number of available connections on the server in the backend.
2830 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2831 * undefined behaviour.
2832 */
2833static int
2834smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2835{
2836 unsigned int maxconn;
2837
2838 smp->flags = SMP_F_VOL_TEST;
2839 smp->data.type = SMP_T_SINT;
2840
2841 if (args->data.srv->maxconn == 0) {
2842 /* one active server is unlimited, return -1 */
2843 smp->data.u.sint = -1;
2844 return 1;
2845 }
2846
2847 maxconn = srv_dynamic_maxconn(args->data.srv);
2848 if (maxconn > args->data.srv->cur_sess)
2849 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
2850 else
2851 smp->data.u.sint = 0;
2852
2853 return 1;
2854}
2855
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002856/* set temp integer to the number of connections pending in the server's queue.
2857 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2858 * undefined behaviour.
2859 */
2860static int
2861smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
2862{
2863 smp->flags = SMP_F_VOL_TEST;
2864 smp->data.type = SMP_T_SINT;
2865 smp->data.u.sint = args->data.srv->nbpend;
2866 return 1;
2867}
2868
Tait Clarridge7896d522012-12-05 21:39:31 -05002869/* set temp integer to the number of enabled servers on the proxy.
2870 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2871 * undefined behaviour.
2872 */
2873static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002874smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05002875{
2876 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002877 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002878 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05002879 return 1;
2880}
2881
Christopher Faulet1bea8652020-07-10 16:03:45 +02002882/* set temp integer to the server weight.
2883 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2884 * undefined behaviour.
2885 */
2886static int
2887smp_fetch_srv_weight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2888{
2889 struct server *srv = args->data.srv;
2890 struct proxy *px = srv->proxy;
2891
2892 smp->flags = SMP_F_VOL_TEST;
2893 smp->data.type = SMP_T_SINT;
2894 smp->data.u.sint = (srv->cur_eweight * px->lbprm.wmult + px->lbprm.wdiv - 1) / px->lbprm.wdiv;
2895 return 1;
2896}
2897
2898/* set temp integer to the server initial weight.
2899 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2900 * undefined behaviour.
2901 */
2902static int
2903smp_fetch_srv_iweight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2904{
2905 smp->flags = SMP_F_VOL_TEST;
2906 smp->data.type = SMP_T_SINT;
2907 smp->data.u.sint = args->data.srv->iweight;
2908 return 1;
2909}
2910
2911/* set temp integer to the server user-specified weight.
2912 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2913 * undefined behaviour.
2914 */
2915static int
2916smp_fetch_srv_uweight(const struct arg *args, struct sample *smp, const char *kw, void *private)
2917{
2918 smp->flags = SMP_F_VOL_TEST;
2919 smp->data.type = SMP_T_SINT;
2920 smp->data.u.sint = args->data.srv->uweight;
2921 return 1;
2922}
2923
Amaury Denoyelled91d7792020-12-10 13:43:56 +01002924static int
2925smp_fetch_be_server_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
2926{
2927 struct proxy *px = NULL;
2928
2929 if (smp->strm)
2930 px = smp->strm->be;
2931 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
2932 px = __objt_check(smp->sess->origin)->proxy;
2933 if (!px)
2934 return 0;
2935
2936 smp->flags = SMP_F_VOL_TXN;
2937 smp->data.type = SMP_T_SINT;
2938 smp->data.u.sint = TICKS_TO_MS(px->timeout.server);
2939 return 1;
2940}
2941
2942static int
2943smp_fetch_be_tunnel_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
2944{
2945 struct proxy *px = NULL;
2946
2947 if (smp->strm)
2948 px = smp->strm->be;
2949 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
2950 px = __objt_check(smp->sess->origin)->proxy;
2951 if (!px)
2952 return 0;
2953
2954 smp->flags = SMP_F_VOL_TXN;
2955 smp->data.type = SMP_T_SINT;
2956 smp->data.u.sint = TICKS_TO_MS(px->timeout.tunnel);
2957 return 1;
2958}
2959
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002960static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
2961{
2962
2963 struct proxy *px;
2964
2965 if (!smp_make_safe(smp))
2966 return 0;
2967
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002968 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002969 if (!px)
2970 return 0;
2971
2972 smp->data.type = SMP_T_SINT;
2973 smp->data.u.sint = be_usable_srv(px);
2974
2975 return 1;
2976}
2977
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002978static int
2979sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
2980{
2981 struct proxy *px;
2982 struct server *srv;
2983 char *bksep;
2984
2985 if (!smp_make_safe(smp))
2986 return 0;
2987
2988 bksep = strchr(smp->data.u.str.area, '/');
2989
2990 if (bksep) {
2991 *bksep = '\0';
2992 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
2993 if (!px)
2994 return 0;
2995 smp->data.u.str.area = bksep + 1;
2996 } else {
2997 if (!(smp->px->cap & PR_CAP_BE))
2998 return 0;
2999 px = smp->px;
3000 }
3001
3002 srv = server_find_by_name(px, smp->data.u.str.area);
3003 if (!srv)
3004 return 0;
3005
3006 smp->data.type = SMP_T_SINT;
3007 smp->data.u.sint = srv->nbpend;
3008 return 1;
3009}
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003010
3011/* Note: must not be declared <const> as its list will be overwritten.
3012 * Please take care of keeping this list alphabetically sorted.
3013 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02003014static struct sample_fetch_kw_list smp_kws = {ILH, {
Amaury Denoyelled91d7792020-12-10 13:43:56 +01003015 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3016 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3017 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3018 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3019 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
3020 { "be_server_timeout", smp_fetch_be_server_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3021 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3022 { "be_tunnel_timeout", smp_fetch_be_tunnel_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
3023 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3024 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3025 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3026 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3027 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3028 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
3029 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
3030 { "srv_name", smp_fetch_srv_name, 0, NULL, SMP_T_STR, SMP_USE_SERVR, },
3031 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3032 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3033 { "srv_weight", smp_fetch_srv_weight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3034 { "srv_iweight", smp_fetch_srv_iweight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
3035 { "srv_uweight", smp_fetch_srv_uweight, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003036 { /* END */ },
3037}};
3038
Willy Tarreau0108d902018-11-25 19:14:37 +01003039INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
3040
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003041/* Note: must not be declared <const> as its list will be overwritten */
3042static struct sample_conv_kw_list sample_conv_kws = {ILH, {
Nenad Merdanovic177adc92019-08-27 01:58:13 +02003043 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
3044 { "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01003045 { /* END */ },
3046}};
3047
Willy Tarreau0108d902018-11-25 19:14:37 +01003048INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003049
Willy Tarreau61612d42012-04-19 18:42:05 +02003050/* Note: must not be declared <const> as its list will be overwritten.
3051 * Please take care of keeping this list alphabetically sorted.
3052 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02003053static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01003054 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01003055}};
3056
Willy Tarreau0108d902018-11-25 19:14:37 +01003057INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01003058
Willy Tarreaubaaee002006-06-26 02:48:02 +02003059/*
3060 * Local variables:
3061 * c-indent-level: 8
3062 * c-basic-offset: 8
3063 * End:
3064 */