blob: f79ac18e54f067408ebecd13b996ddf39049f2b3 [file] [log] [blame]
Willy Tarreaubaaee002006-06-26 02:48:02 +02001/*
2 * Backend variables and functions.
3 *
Willy Tarreau1a7eca12013-01-07 22:38:03 +01004 * Copyright 2000-2013 Willy Tarreau <w@1wt.eu>
Willy Tarreaubaaee002006-06-26 02:48:02 +02005 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13#include <errno.h>
14#include <fcntl.h>
15#include <stdio.h>
16#include <stdlib.h>
17#include <syslog.h>
Willy Tarreauf19cf372006-11-14 15:40:51 +010018#include <string.h>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +020019#include <ctype.h>
Dmitry Sivachenkocaf58982009-08-24 15:11:06 +040020#include <sys/types.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020021
Willy Tarreaudcc048a2020-06-04 19:11:43 +020022#include <haproxy/acl.h>
Willy Tarreau4c7e4b72020-05-27 12:58:42 +020023#include <haproxy/api.h>
Willy Tarreauf1d32c42020-06-04 21:07:02 +020024#include <haproxy/channel.h>
Willy Tarreau4aa573d2020-06-04 18:21:56 +020025#include <haproxy/check.h>
Willy Tarreau762d7a52020-06-04 11:23:07 +020026#include <haproxy/frontend.h>
Willy Tarreau8d366972020-05-27 16:10:29 +020027#include <haproxy/hash.h>
Willy Tarreaucd72d8c2020-06-02 19:11:26 +020028#include <haproxy/http.h>
Willy Tarreauc2b1ff02020-06-04 21:21:03 +020029#include <haproxy/http_ana.h>
Willy Tarreau87735332020-06-04 09:08:41 +020030#include <haproxy/http_htx.h>
Willy Tarreau16f958c2020-06-03 08:44:35 +020031#include <haproxy/htx.h>
Willy Tarreaufbe8da32020-06-04 14:34:27 +020032#include <haproxy/lb_chash.h>
Willy Tarreaub5fc3bf2020-06-04 14:37:38 +020033#include <haproxy/lb_fas.h>
Willy Tarreau02549412020-06-04 14:41:04 +020034#include <haproxy/lb_fwlc.h>
Willy Tarreau546ba422020-06-04 14:45:03 +020035#include <haproxy/lb_fwrr.h>
Willy Tarreau28671592020-06-04 20:22:59 +020036#include <haproxy/lb_map.h>
Willy Tarreau8efbdfb2020-06-04 11:29:21 +020037#include <haproxy/obj_type.h>
Willy Tarreau469509b2020-06-04 15:13:30 +020038#include <haproxy/payload.h>
Willy Tarreau48d25b32020-06-04 18:58:52 +020039#include <haproxy/session.h>
Willy Tarreau209108d2020-06-04 20:30:20 +020040#include <haproxy/ssl_sock.h>
Willy Tarreau5e539c92020-06-04 20:45:39 +020041#include <haproxy/stream_interface.h>
Willy Tarreaucea0e1b2020-06-04 17:25:40 +020042#include <haproxy/task.h>
Willy Tarreauc2f7c582020-06-02 18:15:32 +020043#include <haproxy/ticks.h>
Willy Tarreau92b4f132020-06-01 11:05:15 +020044#include <haproxy/time.h>
Willy Tarreau7a00efb2020-06-02 17:02:59 +020045#include <haproxy/namespace.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020046
Willy Tarreauf268ee82020-06-04 17:05:57 +020047#include <haproxy/global.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020048
Willy Tarreauaa74c4e2020-06-04 10:19:23 +020049#include <haproxy/arg.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020050#include <proto/backend.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020051#include <proto/log.h>
Willy Tarreau2dd7c352020-06-03 15:26:55 +020052#include <haproxy/protocol.h>
Willy Tarreaufc774542020-06-04 17:31:04 +020053#include <haproxy/proto_tcp.h>
Willy Tarreau4aac7db2014-05-16 11:48:10 +020054#include <proto/proxy.h>
Willy Tarreaubaaee002006-06-26 02:48:02 +020055#include <proto/queue.h>
Willy Tarreaue6ce10b2020-06-04 15:33:47 +020056#include <haproxy/sample.h>
Willy Tarreau7f062c42009-03-05 18:43:00 +010057#include <proto/server.h>
Willy Tarreau87b09662015-04-03 00:22:06 +020058#include <proto/stream.h>
Willy Tarreau732eac42015-07-09 11:40:25 +020059
Christopher Fauleteea8fc72019-11-05 16:18:10 +010060#define TRACE_SOURCE &trace_strm
61
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -050062int be_lastsession(const struct proxy *be)
63{
64 if (be->be_counters.last_sess)
65 return now.tv_sec - be->be_counters.last_sess;
66
67 return -1;
68}
69
Bhaskar98634f02013-10-29 23:30:51 -040070/* helper function to invoke the correct hash method */
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070071static unsigned int gen_hash(const struct proxy* px, const char* key, unsigned long len)
Bhaskar98634f02013-10-29 23:30:51 -040072{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -070073 unsigned int hash;
Bhaskar98634f02013-10-29 23:30:51 -040074
75 switch (px->lbprm.algo & BE_LB_HASH_FUNC) {
76 case BE_LB_HFCN_DJB2:
77 hash = hash_djb2(key, len);
78 break;
Willy Tarreaua0f42712013-11-14 14:30:35 +010079 case BE_LB_HFCN_WT6:
80 hash = hash_wt6(key, len);
81 break;
Willy Tarreau324f07f2015-01-20 19:44:50 +010082 case BE_LB_HFCN_CRC32:
83 hash = hash_crc32(key, len);
84 break;
Bhaskar98634f02013-10-29 23:30:51 -040085 case BE_LB_HFCN_SDBM:
86 /* this is the default hash function */
87 default:
88 hash = hash_sdbm(key, len);
89 break;
90 }
91
92 return hash;
93}
94
Willy Tarreaubaaee002006-06-26 02:48:02 +020095/*
96 * This function recounts the number of usable active and backup servers for
97 * proxy <p>. These numbers are returned into the p->srv_act and p->srv_bck.
Willy Tarreaub625a082007-11-26 01:15:43 +010098 * This function also recomputes the total active and backup weights. However,
Willy Tarreauf4cca452008-03-08 21:42:54 +010099 * it does not update tot_weight nor tot_used. Use update_backend_weight() for
Willy Tarreaub625a082007-11-26 01:15:43 +0100100 * this.
Emeric Brun52a91d32017-08-31 14:41:55 +0200101 * This functions is designed to be called before server's weight and state
102 * commit so it uses 'next' weight and states values.
Christopher Faulet5b517552017-06-09 14:17:53 +0200103 *
104 * threads: this is the caller responsibility to lock data. For now, this
105 * function is called from lb modules, so it should be ok. But if you need to
106 * call it from another place, be careful (and update this comment).
Willy Tarreaubaaee002006-06-26 02:48:02 +0200107 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200108void recount_servers(struct proxy *px)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200109{
110 struct server *srv;
111
Willy Tarreau20697042007-11-15 23:26:18 +0100112 px->srv_act = px->srv_bck = 0;
113 px->lbprm.tot_wact = px->lbprm.tot_wbck = 0;
Willy Tarreaub625a082007-11-26 01:15:43 +0100114 px->lbprm.fbck = NULL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200115 for (srv = px->srv; srv != NULL; srv = srv->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +0200116 if (!srv_willbe_usable(srv))
Willy Tarreaub625a082007-11-26 01:15:43 +0100117 continue;
118
Willy Tarreauc93cd162014-05-13 15:54:22 +0200119 if (srv->flags & SRV_F_BACKUP) {
Willy Tarreaub625a082007-11-26 01:15:43 +0100120 if (!px->srv_bck &&
Willy Tarreauf4cca452008-03-08 21:42:54 +0100121 !(px->options & PR_O_USE_ALL_BK))
Willy Tarreaub625a082007-11-26 01:15:43 +0100122 px->lbprm.fbck = srv;
123 px->srv_bck++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400124 srv->cumulative_weight = px->lbprm.tot_wbck;
Emeric Brun52a91d32017-08-31 14:41:55 +0200125 px->lbprm.tot_wbck += srv->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100126 } else {
127 px->srv_act++;
Andrew Rodland13d5ebb2016-10-25 12:49:45 -0400128 srv->cumulative_weight = px->lbprm.tot_wact;
Emeric Brun52a91d32017-08-31 14:41:55 +0200129 px->lbprm.tot_wact += srv->next_eweight;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200130 }
131 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100132}
Willy Tarreau20697042007-11-15 23:26:18 +0100133
Willy Tarreaub625a082007-11-26 01:15:43 +0100134/* This function simply updates the backend's tot_weight and tot_used values
135 * after servers weights have been updated. It is designed to be used after
136 * recount_servers() or equivalent.
Christopher Faulet5b517552017-06-09 14:17:53 +0200137 *
138 * threads: this is the caller responsibility to lock data. For now, this
139 * function is called from lb modules, so it should be ok. But if you need to
140 * call it from another place, be careful (and update this comment).
Willy Tarreaub625a082007-11-26 01:15:43 +0100141 */
Willy Tarreauc5d9c802009-10-01 09:17:05 +0200142void update_backend_weight(struct proxy *px)
Willy Tarreaub625a082007-11-26 01:15:43 +0100143{
Willy Tarreau20697042007-11-15 23:26:18 +0100144 if (px->srv_act) {
145 px->lbprm.tot_weight = px->lbprm.tot_wact;
146 px->lbprm.tot_used = px->srv_act;
147 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100148 else if (px->lbprm.fbck) {
149 /* use only the first backup server */
Emeric Brun52a91d32017-08-31 14:41:55 +0200150 px->lbprm.tot_weight = px->lbprm.fbck->next_eweight;
Willy Tarreaub625a082007-11-26 01:15:43 +0100151 px->lbprm.tot_used = 1;
Willy Tarreau20697042007-11-15 23:26:18 +0100152 }
153 else {
Willy Tarreaub625a082007-11-26 01:15:43 +0100154 px->lbprm.tot_weight = px->lbprm.tot_wbck;
155 px->lbprm.tot_used = px->srv_bck;
Willy Tarreau20697042007-11-15 23:26:18 +0100156 }
Willy Tarreaub625a082007-11-26 01:15:43 +0100157}
158
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200159/*
160 * This function tries to find a running server for the proxy <px> following
161 * the source hash method. Depending on the number of active/backup servers,
162 * it will either look for active servers, or for backup servers.
163 * If any server is found, it will be returned. If no valid server is found,
164 * NULL is returned.
165 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100166static struct server *get_server_sh(struct proxy *px, const char *addr, int len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200167{
168 unsigned int h, l;
169
170 if (px->lbprm.tot_weight == 0)
171 return NULL;
172
173 l = h = 0;
174
175 /* note: we won't hash if there's only one server left */
176 if (px->lbprm.tot_used == 1)
177 goto hash_done;
178
179 while ((l + sizeof (int)) <= len) {
180 h ^= ntohl(*(unsigned int *)(&addr[l]));
181 l += sizeof (int);
182 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500183 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100184 h = full_hash(h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200185 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100186 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100187 return chash_get_server_hash(px, h, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200188 else
189 return map_get_server_hash(px, h);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200190}
191
192/*
193 * This function tries to find a running server for the proxy <px> following
194 * the URI hash method. In order to optimize cache hits, the hash computation
195 * ends at the question mark. Depending on the number of active/backup servers,
196 * it will either look for active servers, or for backup servers.
197 * If any server is found, it will be returned. If no valid server is found,
Willy Tarreaua9a72492019-01-14 16:14:15 +0100198 * NULL is returned. The lbprm.arg_opt{1,2,3} values correspond respectively to
199 * the "whole" optional argument (boolean), the "len" argument (numeric) and
200 * the "depth" argument (numeric).
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200201 *
202 * This code was contributed by Guillaume Dallaire, who also selected this hash
203 * algorithm out of a tens because it gave him the best results.
204 *
205 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100206static struct server *get_server_uh(struct proxy *px, char *uri, int uri_len, const struct server *avoid)
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200207{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700208 unsigned int hash = 0;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200209 int c;
210 int slashes = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400211 const char *start, *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200212
213 if (px->lbprm.tot_weight == 0)
214 return NULL;
215
216 /* note: we won't hash if there's only one server left */
217 if (px->lbprm.tot_used == 1)
218 goto hash_done;
219
Willy Tarreaua9a72492019-01-14 16:14:15 +0100220 if (px->lbprm.arg_opt2) // "len"
221 uri_len = MIN(uri_len, px->lbprm.arg_opt2);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200222
Bhaskar98634f02013-10-29 23:30:51 -0400223 start = end = uri;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200224 while (uri_len--) {
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200225 c = *end;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200226 if (c == '/') {
227 slashes++;
Willy Tarreaua9a72492019-01-14 16:14:15 +0100228 if (slashes == px->lbprm.arg_opt3) /* depth+1 */
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200229 break;
230 }
Willy Tarreaua9a72492019-01-14 16:14:15 +0100231 else if (c == '?' && !px->lbprm.arg_opt1) // "whole"
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200232 break;
Willy Tarreaufad4ffc2014-10-17 12:11:50 +0200233 end++;
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200234 }
Bhaskar98634f02013-10-29 23:30:51 -0400235
236 hash = gen_hash(px, start, (end - start));
237
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500238 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100239 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200240 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100241 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100242 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200243 else
244 return map_get_server_hash(px, hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200245}
246
Christopher Faulet5b517552017-06-09 14:17:53 +0200247/*
Willy Tarreau01732802007-11-01 22:48:15 +0100248 * This function tries to find a running server for the proxy <px> following
249 * the URL parameter hash method. It looks for a specific parameter in the
250 * URL and hashes it to compute the server ID. This is useful to optimize
251 * performance by avoiding bounces between servers in contexts where sessions
252 * are shared but cookies are not usable. If the parameter is not found, NULL
253 * is returned. If any server is found, it will be returned. If no valid server
254 * is found, NULL is returned.
Willy Tarreau01732802007-11-01 22:48:15 +0100255 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100256static 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 +0100257{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700258 unsigned int hash = 0;
Bhaskar98634f02013-10-29 23:30:51 -0400259 const char *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200260 const char *p;
261 const char *params;
Willy Tarreau01732802007-11-01 22:48:15 +0100262 int plen;
263
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200264 /* when tot_weight is 0 then so is srv_count */
Willy Tarreau20697042007-11-15 23:26:18 +0100265 if (px->lbprm.tot_weight == 0)
Willy Tarreau01732802007-11-01 22:48:15 +0100266 return NULL;
267
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200268 if ((p = memchr(uri, '?', uri_len)) == NULL)
269 return NULL;
270
Willy Tarreau01732802007-11-01 22:48:15 +0100271 p++;
272
273 uri_len -= (p - uri);
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100274 plen = px->lbprm.arg_len;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200275 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100276
277 while (uri_len > plen) {
278 /* Look for the parameter name followed by an equal symbol */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200279 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100280 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200281 /* OK, we have the parameter here at <params>, and
Willy Tarreau01732802007-11-01 22:48:15 +0100282 * the value after the equal sign, at <p>
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200283 * skip the equal symbol
Willy Tarreau01732802007-11-01 22:48:15 +0100284 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200285 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400286 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200287 uri_len -= plen + 1;
288
Bhaskar98634f02013-10-29 23:30:51 -0400289 while (uri_len && *end != '&') {
Willy Tarreau01732802007-11-01 22:48:15 +0100290 uri_len--;
Bhaskar98634f02013-10-29 23:30:51 -0400291 end++;
Willy Tarreau01732802007-11-01 22:48:15 +0100292 }
Bhaskar98634f02013-10-29 23:30:51 -0400293 hash = gen_hash(px, start, (end - start));
294
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500295 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100296 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400297
Willy Tarreau6c30be52019-01-14 17:07:39 +0100298 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100299 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200300 else
301 return map_get_server_hash(px, hash);
Willy Tarreau01732802007-11-01 22:48:15 +0100302 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200303 }
304 /* skip to next parameter */
305 p = memchr(params, '&', uri_len);
306 if (!p)
307 return NULL;
308 p++;
309 uri_len -= (p - params);
310 params = p;
311 }
312 return NULL;
313}
314
315/*
316 * this does the same as the previous server_ph, but check the body contents
317 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100318static struct server *get_server_ph_post(struct stream *s, const struct server *avoid)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200319{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700320 unsigned int hash = 0;
Willy Tarreau22ec1ea2014-11-27 20:45:39 +0100321 struct channel *req = &s->req;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200322 struct proxy *px = s->be;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200323 struct htx *htx = htxbuf(&req->buf);
324 struct htx_blk *blk;
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100325 unsigned int plen = px->lbprm.arg_len;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100326 unsigned long len;
327 const char *params, *p, *start, *end;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200328
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100329 if (px->lbprm.tot_weight == 0)
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200330 return NULL;
331
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200332 p = params = NULL;
333 len = 0;
334 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
335 enum htx_blk_type type = htx_get_blk_type(blk);
336 struct ist v;
Willy Tarreauf69d4ff2015-05-02 00:05:47 +0200337
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200338 if (type != HTX_BLK_DATA)
339 continue;
340 v = htx_get_blk_value(htx, blk);
341 p = params = v.ptr;
342 len = v.len;
343 break;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100344 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200345
346 while (len > plen) {
347 /* Look for the parameter name followed by an equal symbol */
348 if (params[plen] == '=') {
Willy Tarreau4c03d1c2019-01-14 15:23:54 +0100349 if (memcmp(params, px->lbprm.arg_str, plen) == 0) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200350 /* OK, we have the parameter here at <params>, and
351 * the value after the equal sign, at <p>
352 * skip the equal symbol
353 */
354 p += plen + 1;
Bhaskar98634f02013-10-29 23:30:51 -0400355 start = end = p;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200356 len -= plen + 1;
357
Bhaskar98634f02013-10-29 23:30:51 -0400358 while (len && *end != '&') {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200359 if (unlikely(!HTTP_IS_TOKEN(*p))) {
Willy Tarreau157dd632009-12-06 19:18:09 +0100360 /* if in a POST, body must be URI encoded or it's not a URI.
Bhaskar98634f02013-10-29 23:30:51 -0400361 * Do not interpret any possible binary data as a parameter.
Willy Tarreau157dd632009-12-06 19:18:09 +0100362 */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200363 if (likely(HTTP_IS_LWS(*p))) /* eol, uncertain uri len */
364 break;
365 return NULL; /* oh, no; this is not uri-encoded.
366 * This body does not contain parameters.
367 */
368 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200369 len--;
Bhaskar98634f02013-10-29 23:30:51 -0400370 end++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200371 /* should we break if vlen exceeds limit? */
372 }
Bhaskar98634f02013-10-29 23:30:51 -0400373 hash = gen_hash(px, start, (end - start));
374
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500375 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100376 hash = full_hash(hash);
Bhaskar98634f02013-10-29 23:30:51 -0400377
Willy Tarreau6c30be52019-01-14 17:07:39 +0100378 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100379 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200380 else
381 return map_get_server_hash(px, hash);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200382 }
383 }
Willy Tarreau01732802007-11-01 22:48:15 +0100384 /* skip to next parameter */
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200385 p = memchr(params, '&', len);
Willy Tarreau01732802007-11-01 22:48:15 +0100386 if (!p)
387 return NULL;
388 p++;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200389 len -= (p - params);
390 params = p;
Willy Tarreau01732802007-11-01 22:48:15 +0100391 }
392 return NULL;
393}
Willy Tarreaubaaee002006-06-26 02:48:02 +0200394
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200395
Willy Tarreaubaaee002006-06-26 02:48:02 +0200396/*
Benoitaffb4812009-03-25 13:02:10 +0100397 * This function tries to find a running server for the proxy <px> following
398 * the Header parameter hash method. It looks for a specific parameter in the
399 * URL and hashes it to compute the server ID. This is useful to optimize
400 * performance by avoiding bounces between servers in contexts where sessions
401 * are shared but cookies are not usable. If the parameter is not found, NULL
402 * is returned. If any server is found, it will be returned. If no valid server
Willy Tarreau9fed8582019-01-14 16:04:54 +0100403 * is found, NULL is returned. When lbprm.arg_opt1 is set, the hash will only
404 * apply to the middle part of a domain name ("use_domain_only" option).
Benoitaffb4812009-03-25 13:02:10 +0100405 */
Willy Tarreau59884a62019-01-02 14:48:31 +0100406static struct server *get_server_hh(struct stream *s, const struct server *avoid)
Benoitaffb4812009-03-25 13:02:10 +0100407{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700408 unsigned int hash = 0;
Benoitaffb4812009-03-25 13:02:10 +0100409 struct proxy *px = s->be;
Willy Tarreau484ff072019-01-14 15:28:53 +0100410 unsigned int plen = px->lbprm.arg_len;
Benoitaffb4812009-03-25 13:02:10 +0100411 unsigned long len;
Benoitaffb4812009-03-25 13:02:10 +0100412 const char *p;
Bhaskar98634f02013-10-29 23:30:51 -0400413 const char *start, *end;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200414 struct htx *htx = htxbuf(&s->req.buf);
415 struct http_hdr_ctx ctx = { .blk = NULL };
Benoitaffb4812009-03-25 13:02:10 +0100416
417 /* tot_weight appears to mean srv_count */
418 if (px->lbprm.tot_weight == 0)
419 return NULL;
420
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200421 /* note: we won't hash if there's only one server left */
422 if (px->lbprm.tot_used == 1)
423 goto hash_done;
424
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200425 http_find_header(htx, ist2(px->lbprm.arg_str, plen), &ctx, 0);
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100426
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200427 /* if the header is not found or empty, let's fallback to round robin */
428 if (!ctx.blk || !ctx.value.len)
429 return NULL;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100430
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200431 /* Found a the param_name in the headers.
432 * we will compute the hash based on this value ctx.val.
433 */
434 len = ctx.value.len;
435 p = ctx.value.ptr;
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100436
Willy Tarreau9fed8582019-01-14 16:04:54 +0100437 if (!px->lbprm.arg_opt1) {
Bhaskar98634f02013-10-29 23:30:51 -0400438 hash = gen_hash(px, p, len);
Benoitaffb4812009-03-25 13:02:10 +0100439 } else {
440 int dohash = 0;
Cyril Bontéf607d812015-01-04 15:17:36 +0100441 p += len;
Benoitaffb4812009-03-25 13:02:10 +0100442 /* special computation, use only main domain name, not tld/host
443 * going back from the end of string, start hashing at first
444 * dot stop at next.
445 * This is designed to work with the 'Host' header, and requires
446 * a special option to activate this.
447 */
Cyril Bontéf607d812015-01-04 15:17:36 +0100448 end = p;
Benoitaffb4812009-03-25 13:02:10 +0100449 while (len) {
Cyril Bontéf607d812015-01-04 15:17:36 +0100450 if (dohash) {
451 /* Rewind the pointer until the previous char
452 * is a dot, this will allow to set the start
453 * position of the domain. */
454 if (*(p - 1) == '.')
Benoitaffb4812009-03-25 13:02:10 +0100455 break;
Benoitaffb4812009-03-25 13:02:10 +0100456 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100457 else if (*p == '.') {
458 /* The pointer is rewinded to the dot before the
459 * tld, we memorize the end of the domain and
460 * can enter the domain processing. */
461 end = p;
462 dohash = 1;
463 }
Benoitaffb4812009-03-25 13:02:10 +0100464 p--;
Cyril Bontéf607d812015-01-04 15:17:36 +0100465 len--;
Benoitaffb4812009-03-25 13:02:10 +0100466 }
Cyril Bontéf607d812015-01-04 15:17:36 +0100467 start = p;
Bhaskar98634f02013-10-29 23:30:51 -0400468 hash = gen_hash(px, start, (end - start));
Benoitaffb4812009-03-25 13:02:10 +0100469 }
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500470 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100471 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200472 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100473 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100474 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200475 else
476 return map_get_server_hash(px, hash);
Benoitaffb4812009-03-25 13:02:10 +0100477}
478
Willy Tarreau34db1082012-04-19 17:16:54 +0200479/* RDP Cookie HASH. */
Willy Tarreau59884a62019-01-02 14:48:31 +0100480static struct server *get_server_rch(struct stream *s, const struct server *avoid)
Emeric Brun736aa232009-06-30 17:56:00 +0200481{
Dan Dubovikbd57a9f2014-07-08 08:51:03 -0700482 unsigned int hash = 0;
Emeric Brun736aa232009-06-30 17:56:00 +0200483 struct proxy *px = s->be;
484 unsigned long len;
Emeric Brun736aa232009-06-30 17:56:00 +0200485 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +0200486 struct sample smp;
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200487 int rewind;
Emeric Brun736aa232009-06-30 17:56:00 +0200488
489 /* tot_weight appears to mean srv_count */
490 if (px->lbprm.tot_weight == 0)
491 return NULL;
492
Willy Tarreau37406352012-04-23 16:16:37 +0200493 memset(&smp, 0, sizeof(smp));
Emeric Brun736aa232009-06-30 17:56:00 +0200494
Willy Tarreau6a445eb2018-06-19 07:04:45 +0200495 rewind = co_data(&s->req);
496 c_rew(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200497
Willy Tarreau484ff072019-01-14 15:28:53 +0100498 ret = fetch_rdp_cookie_name(s, &smp, px->lbprm.arg_str, px->lbprm.arg_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200499 len = smp.data.u.str.data;
Willy Tarreau664092c2011-12-16 19:11:42 +0100500
Willy Tarreaubcbd3932018-06-06 07:13:22 +0200501 c_adv(&s->req, rewind);
Willy Tarreaud1de8af2012-05-18 22:12:14 +0200502
Willy Tarreau37406352012-04-23 16:16:37 +0200503 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || len == 0)
Emeric Brun736aa232009-06-30 17:56:00 +0200504 return NULL;
505
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200506 /* note: we won't hash if there's only one server left */
507 if (px->lbprm.tot_used == 1)
508 goto hash_done;
509
Willy Tarreau484ff072019-01-14 15:28:53 +0100510 /* Found the param_name in the headers.
Emeric Brun736aa232009-06-30 17:56:00 +0200511 * we will compute the hash based on this value ctx.val.
512 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +0200513 hash = gen_hash(px, smp.data.u.str.area, len);
Bhaskar98634f02013-10-29 23:30:51 -0400514
Bhaskar Maddalab6c0ac92013-11-05 11:54:02 -0500515 if ((px->lbprm.algo & BE_LB_HASH_MOD) == BE_LB_HMOD_AVAL)
Willy Tarreau798a39c2010-11-24 15:04:29 +0100516 hash = full_hash(hash);
Willy Tarreau39c9ba72009-10-01 21:11:15 +0200517 hash_done:
Willy Tarreau6c30be52019-01-14 17:07:39 +0100518 if ((px->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau59884a62019-01-02 14:48:31 +0100519 return chash_get_server_hash(px, hash, avoid);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200520 else
521 return map_get_server_hash(px, hash);
Emeric Brun736aa232009-06-30 17:56:00 +0200522}
Christopher Faulet5b517552017-06-09 14:17:53 +0200523
Willy Tarreau760e81d2018-05-03 07:20:40 +0200524/* random value */
Willy Tarreau59884a62019-01-02 14:48:31 +0100525static struct server *get_server_rnd(struct stream *s, const struct server *avoid)
Willy Tarreau760e81d2018-05-03 07:20:40 +0200526{
527 unsigned int hash = 0;
528 struct proxy *px = s->be;
Willy Tarreau21c741a2019-01-14 18:14:27 +0100529 struct server *prev, *curr;
530 int draws = px->lbprm.arg_opt1; // number of draws
Willy Tarreau760e81d2018-05-03 07:20:40 +0200531
532 /* tot_weight appears to mean srv_count */
533 if (px->lbprm.tot_weight == 0)
534 return NULL;
535
Willy Tarreau21c741a2019-01-14 18:14:27 +0100536 curr = NULL;
537 do {
538 prev = curr;
Willy Tarreaub9f54c52020-03-08 17:31:39 +0100539 hash = ha_random32();
Willy Tarreau21c741a2019-01-14 18:14:27 +0100540 curr = chash_get_server_hash(px, hash, avoid);
541 if (!curr)
542 break;
543
544 /* compare the new server to the previous best choice and pick
545 * the one with the least currently served requests.
546 */
547 if (prev && prev != curr &&
548 curr->served * prev->cur_eweight > prev->served * curr->cur_eweight)
549 curr = prev;
550 } while (--draws > 0);
551
552 return curr;
Willy Tarreau760e81d2018-05-03 07:20:40 +0200553}
554
Benoitaffb4812009-03-25 13:02:10 +0100555/*
Willy Tarreau87b09662015-04-03 00:22:06 +0200556 * This function applies the load-balancing algorithm to the stream, as
557 * defined by the backend it is assigned to. The stream is then marked as
Willy Tarreau7c669d72008-06-20 15:04:11 +0200558 * 'assigned'.
559 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200560 * This function MAY NOT be called with SF_ASSIGNED already set. If the stream
Willy Tarreau7c669d72008-06-20 15:04:11 +0200561 * had a server previously assigned, it is rebalanced, trying to avoid the same
Willy Tarreau827aee92011-03-10 16:55:02 +0100562 * server, which should still be present in target_srv(&s->target) before the call.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200563 * The function tries to keep the original connection slot if it reconnects to
564 * the same server, otherwise it releases it and tries to offer it.
565 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200566 * It is illegal to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200567 *
568 * It may return :
Willy Tarreau664beb82011-03-10 11:38:29 +0100569 * SRV_STATUS_OK if everything is OK. ->srv and ->target are assigned.
Willy Tarreau87b09662015-04-03 00:22:06 +0200570 * SRV_STATUS_NOSRV if no server is available. Stream is not ASSIGNED
571 * SRV_STATUS_FULL if all servers are saturated. Stream is not ASSIGNED
Willy Tarreaubaaee002006-06-26 02:48:02 +0200572 * SRV_STATUS_INTERNAL for other unrecoverable errors.
573 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200574 * Upon successful return, the stream flag SF_ASSIGNED is set to indicate that
Willy Tarreau827aee92011-03-10 16:55:02 +0100575 * it does not need to be called anymore. This means that target_srv(&s->target)
576 * can be trusted in balance and direct modes.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200577 *
578 */
579
Willy Tarreau87b09662015-04-03 00:22:06 +0200580int assign_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200581{
Olivier Houchardba4fff52018-12-01 14:40:40 +0100582 struct connection *conn = NULL;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200583 struct server *conn_slot;
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100584 struct server *srv = NULL, *prev_srv;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200585 int err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100586
Simon Horman8effd3d2011-08-13 08:03:52 +0900587 DPRINTF(stderr,"assign_server : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200588
Willy Tarreau7c669d72008-06-20 15:04:11 +0200589 err = SRV_STATUS_INTERNAL;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200590 if (unlikely(s->pend_pos || s->flags & SF_ASSIGNED))
Willy Tarreau7c669d72008-06-20 15:04:11 +0200591 goto out_err;
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100592
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100593 prev_srv = objt_server(s->target);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200594 conn_slot = s->srv_conn;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200595
Willy Tarreau7c669d72008-06-20 15:04:11 +0200596 /* We have to release any connection slot before applying any LB algo,
597 * otherwise we may erroneously end up with no available slot.
598 */
599 if (conn_slot)
600 sess_change_server(s, NULL);
601
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100602 /* We will now try to find the good server and store it into <objt_server(s->target)>.
603 * Note that <objt_server(s->target)> may be NULL in case of dispatch or proxy mode,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200604 * as well as if no server is available (check error code).
605 */
Willy Tarreau1a20a5d2007-11-01 21:08:19 +0100606
Willy Tarreau827aee92011-03-10 16:55:02 +0100607 srv = NULL;
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100608 s->target = NULL;
Willy Tarreau664beb82011-03-10 11:38:29 +0100609
Olivier Houchardba4fff52018-12-01 14:40:40 +0100610 if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200611 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100612 (s->be->options & PR_O_PREF_LAST))) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100613 struct sess_srv_list *srv_list;
614 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
615 struct server *tmpsrv = objt_server(srv_list->target);
Olivier Houchardba4fff52018-12-01 14:40:40 +0100616
617 if (tmpsrv && tmpsrv->proxy == s->be &&
Olivier Houchard250031e2019-05-29 15:01:50 +0200618 ((s->sess->flags & SESS_FL_PREFER_LAST) ||
Olivier Houchardba4fff52018-12-01 14:40:40 +0100619 (!s->be->max_ka_queue ||
620 server_has_room(tmpsrv) || (
621 tmpsrv->nbpend + 1 < s->be->max_ka_queue))) &&
622 srv_currently_usable(tmpsrv)) {
Olivier Houchard351411f2018-12-27 17:20:54 +0100623 list_for_each_entry(conn, &srv_list->conn_list, session_list) {
Willy Tarreau911db9b2020-01-23 16:27:54 +0100624 if (!(conn->flags & CO_FL_WAIT_XPRT)) {
Olivier Houchardba4fff52018-12-01 14:40:40 +0100625 srv = tmpsrv;
626 s->target = &srv->obj_type;
627 goto out_ok;
628 }
629 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100630 }
631 }
Willy Tarreau9420b122013-12-15 18:58:25 +0100632 }
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100633 if (s->be->lbprm.algo & BE_LB_KIND) {
Christopher Faulet5b517552017-06-09 14:17:53 +0200634
Willy Tarreau7c669d72008-06-20 15:04:11 +0200635 /* we must check if we have at least one server available */
636 if (!s->be->lbprm.tot_weight) {
637 err = SRV_STATUS_NOSRV;
638 goto out;
639 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200640
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200641 /* First check whether we need to fetch some data or simply call
642 * the LB lookup function. Only the hashing functions will need
643 * some input data in fact, and will support multiple algorithms.
644 */
645 switch (s->be->lbprm.algo & BE_LB_LKUP) {
646 case BE_LB_LKUP_RRTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100647 srv = fwrr_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200648 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200649
Willy Tarreauf09c6602012-02-13 17:12:08 +0100650 case BE_LB_LKUP_FSTREE:
651 srv = fas_get_next_server(s->be, prev_srv);
652 break;
653
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200654 case BE_LB_LKUP_LCTREE:
Willy Tarreau827aee92011-03-10 16:55:02 +0100655 srv = fwlc_get_next_server(s->be, prev_srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200656 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200657
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200658 case BE_LB_LKUP_CHTREE:
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200659 case BE_LB_LKUP_MAP:
Willy Tarreau9757a382009-10-03 12:56:50 +0200660 if ((s->be->lbprm.algo & BE_LB_KIND) == BE_LB_KIND_RR) {
Willy Tarreau760e81d2018-05-03 07:20:40 +0200661 if ((s->be->lbprm.algo & BE_LB_PARM) == BE_LB_RR_RANDOM)
Willy Tarreau59884a62019-01-02 14:48:31 +0100662 srv = get_server_rnd(s, prev_srv);
Willy Tarreau6c30be52019-01-14 17:07:39 +0100663 else if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100664 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200665 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100666 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau9757a382009-10-03 12:56:50 +0200667 break;
668 }
669 else if ((s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_HI) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200670 /* unknown balancing algorithm */
Willy Tarreau7c669d72008-06-20 15:04:11 +0200671 err = SRV_STATUS_INTERNAL;
672 goto out;
673 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200674
675 switch (s->be->lbprm.algo & BE_LB_PARM) {
676 case BE_LB_HASH_SRC:
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200677 conn = objt_conn(strm_orig(s));
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200678 if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200679 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200680 (void *)&((struct sockaddr_in *)conn->src)->sin_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100681 4, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200682 }
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200683 else if (conn && conn_get_src(conn) && conn->src->ss_family == AF_INET6) {
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200684 srv = get_server_sh(s->be,
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200685 (void *)&((struct sockaddr_in6 *)conn->src)->sin6_addr,
Willy Tarreau59884a62019-01-02 14:48:31 +0100686 16, prev_srv);
Willy Tarreau5dd7fa12012-03-31 19:53:37 +0200687 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200688 else {
689 /* unknown IP family */
690 err = SRV_STATUS_INTERNAL;
691 goto out;
692 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200693 break;
694
695 case BE_LB_HASH_URI:
696 /* URI hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200697 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100698 struct ist uri;
699
Christopher Faulet297fbb42019-05-13 14:41:27 +0200700 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100701 srv = get_server_uh(s->be, uri.ptr, uri.len, prev_srv);
702 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200703 break;
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +0200704
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200705 case BE_LB_HASH_PRM:
706 /* URL Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200707 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY) {
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100708 struct ist uri;
709
Christopher Faulet297fbb42019-05-13 14:41:27 +0200710 uri = htx_sl_req_uri(http_get_stline(htxbuf(&s->req.buf)));
Christopher Fauletf7679ad2019-02-04 12:02:18 +0100711 srv = get_server_ph(s->be, uri.ptr, uri.len, prev_srv);
Willy Tarreau61a21a32011-03-01 20:35:49 +0100712
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200713 if (!srv && s->txn->meth == HTTP_METH_POST)
714 srv = get_server_ph_post(s, prev_srv);
715 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200716 break;
Benoitaffb4812009-03-25 13:02:10 +0100717
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200718 case BE_LB_HASH_HDR:
719 /* Header Parameter hashing */
Christopher Faulet7d37fbb2019-07-15 15:37:57 +0200720 if (IS_HTX_STRM(s) && s->txn->req.msg_state >= HTTP_MSG_BODY)
721 srv = get_server_hh(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200722 break;
723
724 case BE_LB_HASH_RDP:
725 /* RDP Cookie hashing */
Willy Tarreau59884a62019-01-02 14:48:31 +0100726 srv = get_server_rch(s, prev_srv);
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200727 break;
728
729 default:
730 /* unknown balancing algorithm */
731 err = SRV_STATUS_INTERNAL;
732 goto out;
Benoitaffb4812009-03-25 13:02:10 +0100733 }
Emeric Brun736aa232009-06-30 17:56:00 +0200734
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200735 /* If the hashing parameter was not found, let's fall
736 * back to round robin on the map.
737 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100738 if (!srv) {
Willy Tarreau6c30be52019-01-14 17:07:39 +0100739 if ((s->be->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_CHTREE)
Willy Tarreau827aee92011-03-10 16:55:02 +0100740 srv = chash_get_next_server(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200741 else
Willy Tarreau827aee92011-03-10 16:55:02 +0100742 srv = map_get_server_rr(s->be, prev_srv);
Willy Tarreau6b2e11b2009-10-01 07:52:15 +0200743 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200744
745 /* end of map-based LB */
Emeric Brun736aa232009-06-30 17:56:00 +0200746 break;
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200747
Willy Tarreau7c669d72008-06-20 15:04:11 +0200748 default:
749 /* unknown balancing algorithm */
750 err = SRV_STATUS_INTERNAL;
751 goto out;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200752 }
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200753
Willy Tarreau827aee92011-03-10 16:55:02 +0100754 if (!srv) {
Willy Tarreauda76f4f2009-10-03 12:36:05 +0200755 err = SRV_STATUS_FULL;
756 goto out;
757 }
Willy Tarreau827aee92011-03-10 16:55:02 +0100758 else if (srv != prev_srv) {
Olivier Houchard237f7812019-03-08 18:49:07 +0100759 _HA_ATOMIC_ADD(&s->be->be_counters.cum_lbconn, 1);
760 _HA_ATOMIC_ADD(&srv->counters.cum_lbconn, 1);
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100761 }
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100762 s->target = &srv->obj_type;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200763 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200764 else if (s->be->options & (PR_O_DISPATCH | PR_O_TRANSP)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100765 s->target = &s->be->obj_type;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200766 }
Olivier Houchard2442f682018-12-01 17:03:38 +0100767 else if ((s->be->options & PR_O_HTTP_PROXY)) {
768 conn = cs_conn(objt_cs(s->si[1].end));
769
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200770 if (conn && conn->dst && is_addr(conn->dst)) {
Olivier Houchard2442f682018-12-01 17:03:38 +0100771 /* in proxy mode, we need a valid destination address */
772 s->target = &s->be->obj_type;
773 } else {
774 err = SRV_STATUS_NOSRV;
775 goto out;
776 }
Willy Tarreau664beb82011-03-10 11:38:29 +0100777 }
778 else {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200779 err = SRV_STATUS_NOSRV;
780 goto out;
781 }
782
Olivier Houchard00cf70f2018-11-30 17:24:55 +0100783out_ok:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200784 s->flags |= SF_ASSIGNED;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200785 err = SRV_STATUS_OK;
786 out:
787
788 /* Either we take back our connection slot, or we offer it to someone
789 * else if we don't need it anymore.
790 */
791 if (conn_slot) {
Willy Tarreau827aee92011-03-10 16:55:02 +0100792 if (conn_slot == srv) {
793 sess_change_server(s, srv);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200794 } else {
795 if (may_dequeue_tasks(conn_slot, s->be))
796 process_srv_queue(conn_slot);
797 }
798 }
799
800 out_err:
801 return err;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200802}
803
Willy Tarreaubaaee002006-06-26 02:48:02 +0200804/*
Willy Tarreaue7dff022015-04-03 01:14:29 +0200805 * This function assigns a server address to a stream, and sets SF_ADDR_SET.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200806 * The address is taken from the currently assigned server, or from the
807 * dispatch or transparent address.
808 *
809 * It may return :
810 * SRV_STATUS_OK if everything is OK.
811 * SRV_STATUS_INTERNAL for other unrecoverable errors.
812 *
Willy Tarreaue7dff022015-04-03 01:14:29 +0200813 * Upon successful return, the stream flag SF_ADDR_SET is set. This flag is
Willy Tarreaubaaee002006-06-26 02:48:02 +0200814 * not cleared, so it's to the caller to clear it if required.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200815 */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200816int assign_server_address(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200817{
Willy Tarreaud0d8da92015-04-04 02:10:38 +0200818 struct connection *cli_conn = objt_conn(strm_orig(s));
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200819
Christopher Faulet56803b12017-11-24 16:06:18 +0100820 DPRINTF(stderr,"assign_server_address : s=%p\n",s);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200821
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200822 if (!sockaddr_alloc(&s->target_addr))
Willy Tarreauca79f592019-07-17 19:04:47 +0200823 return SRV_STATUS_INTERNAL;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200824
Willy Tarreaue7dff022015-04-03 01:14:29 +0200825 if ((s->flags & SF_DIRECT) || (s->be->lbprm.algo & BE_LB_KIND)) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200826 /* A server is necessarily known for this stream */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200827 if (!(s->flags & SF_ASSIGNED))
Willy Tarreaubaaee002006-06-26 02:48:02 +0200828 return SRV_STATUS_INTERNAL;
829
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200830 *s->target_addr = __objt_server(s->target)->addr;
831 set_host_port(s->target_addr, __objt_server(s->target)->svc_port);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200832
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200833 if (!is_addr(s->target_addr) && cli_conn) {
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200834 /* if the server has no address, we use the same address
835 * the client asked, which is handy for remapping ports
Willy Tarreau9cf8d3f2014-05-09 22:56:10 +0200836 * locally on multiple addresses at once. Nothing is done
837 * for AF_UNIX addresses.
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200838 */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200839 if (!conn_get_dst(cli_conn)) {
840 /* do nothing if we can't retrieve the address */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200841 } else if (cli_conn->dst->ss_family == AF_INET) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200842 ((struct sockaddr_in *)s->target_addr)->sin_addr = ((struct sockaddr_in *)cli_conn->dst)->sin_addr;
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200843 } else if (cli_conn->dst->ss_family == AF_INET6) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200844 ((struct sockaddr_in6 *)s->target_addr)->sin6_addr = ((struct sockaddr_in6 *)cli_conn->dst)->sin6_addr;
Emeric Brunec810d12010-10-22 16:36:33 +0200845 }
Willy Tarreaud669a4f2010-07-13 14:49:50 +0200846 }
847
Willy Tarreaubaaee002006-06-26 02:48:02 +0200848 /* if this server remaps proxied ports, we'll use
849 * the port the client connected to with an offset. */
Willy Tarreau1e582e52018-09-20 11:29:28 +0200850 if ((__objt_server(s->target)->flags & SRV_F_MAPPORTS) && cli_conn) {
David du Colombier6f5ccb12011-03-10 22:26:24 +0100851 int base_port;
852
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200853 if (conn_get_dst(cli_conn)) {
854 /* First, retrieve the port from the incoming connection */
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200855 base_port = get_host_port(cli_conn->dst);
David du Colombier6f5ccb12011-03-10 22:26:24 +0100856
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200857 /* Second, assign the outgoing connection's port */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200858 base_port += get_host_port(s->target_addr);
859 set_host_port(s->target_addr, base_port);
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200860 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200861 }
862 }
Willy Tarreau1620ec32011-08-06 17:05:02 +0200863 else if (s->be->options & PR_O_DISPATCH) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200864 /* connect to the defined dispatch addr */
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200865 *s->target_addr = s->be->dispatch_addr;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200866 }
Willy Tarreaub363a1f2013-10-01 10:45:07 +0200867 else if ((s->be->options & PR_O_TRANSP) && cli_conn) {
Willy Tarreaubaaee002006-06-26 02:48:02 +0200868 /* in transparent mode, use the original dest addr if no dispatch specified */
Willy Tarreau3cc01d82019-07-17 11:27:38 +0200869 if (conn_get_dst(cli_conn) &&
Willy Tarreauc0e16f22019-07-17 18:16:30 +0200870 (cli_conn->dst->ss_family == AF_INET || cli_conn->dst->ss_family == AF_INET6))
Willy Tarreau1c8d32b2019-07-18 15:47:45 +0200871 *s->target_addr = *cli_conn->dst;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200872 }
Alexandre Cassen5eb1a902007-11-29 15:43:32 +0100873 else if (s->be->options & PR_O_HTTP_PROXY) {
874 /* If HTTP PROXY option is set, then server is already assigned
875 * during incoming client request parsing. */
876 }
Willy Tarreau1a1158b2007-01-20 11:07:46 +0100877 else {
878 /* no server and no LB algorithm ! */
879 return SRV_STATUS_INTERNAL;
880 }
Willy Tarreaubaaee002006-06-26 02:48:02 +0200881
Willy Tarreaue7dff022015-04-03 01:14:29 +0200882 s->flags |= SF_ADDR_SET;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200883 return SRV_STATUS_OK;
884}
885
Willy Tarreau87b09662015-04-03 00:22:06 +0200886/* This function assigns a server to stream <s> if required, and can add the
Willy Tarreaubaaee002006-06-26 02:48:02 +0200887 * connection to either the assigned server's queue or to the proxy's queue.
Willy Tarreau87b09662015-04-03 00:22:06 +0200888 * If ->srv_conn is set, the stream is first released from the server.
Willy Tarreaue7dff022015-04-03 01:14:29 +0200889 * It may also be called with SF_DIRECT and/or SF_ASSIGNED though. It will
Willy Tarreau7c669d72008-06-20 15:04:11 +0200890 * be called before any connection and after any retry or redispatch occurs.
891 *
Willy Tarreau87b09662015-04-03 00:22:06 +0200892 * It is not allowed to call this function with a stream in a queue.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200893 *
894 * Returns :
895 *
896 * SRV_STATUS_OK if everything is OK.
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100897 * SRV_STATUS_NOSRV if no server is available. objt_server(s->target) = NULL.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200898 * SRV_STATUS_QUEUED if the connection has been queued.
899 * SRV_STATUS_FULL if the server(s) is/are saturated and the
Willy Tarreau827aee92011-03-10 16:55:02 +0100900 * connection could not be queued at the server's,
Willy Tarreau7c669d72008-06-20 15:04:11 +0200901 * which may be NULL if we queue on the backend.
Willy Tarreaubaaee002006-06-26 02:48:02 +0200902 * SRV_STATUS_INTERNAL for other unrecoverable errors.
903 *
904 */
Willy Tarreau87b09662015-04-03 00:22:06 +0200905int assign_server_and_queue(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +0200906{
907 struct pendconn *p;
Willy Tarreau827aee92011-03-10 16:55:02 +0100908 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200909 int err;
910
911 if (s->pend_pos)
912 return SRV_STATUS_INTERNAL;
913
Willy Tarreau7c669d72008-06-20 15:04:11 +0200914 err = SRV_STATUS_OK;
Willy Tarreaue7dff022015-04-03 01:14:29 +0200915 if (!(s->flags & SF_ASSIGNED)) {
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100916 struct server *prev_srv = objt_server(s->target);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100917
Willy Tarreau7c669d72008-06-20 15:04:11 +0200918 err = assign_server(s);
Willy Tarreau3d80d912011-03-10 11:42:13 +0100919 if (prev_srv) {
Willy Tarreau87b09662015-04-03 00:22:06 +0200920 /* This stream was previously assigned to a server. We have to
921 * update the stream's and the server's stats :
Willy Tarreau7c669d72008-06-20 15:04:11 +0200922 * - if the server changed :
923 * - set TX_CK_DOWN if txn.flags was TX_CK_VALID
Willy Tarreaue7dff022015-04-03 01:14:29 +0200924 * - set SF_REDISP if it was successfully redispatched
Willy Tarreau7c669d72008-06-20 15:04:11 +0200925 * - increment srv->redispatches and be->redispatches
926 * - if the server remained the same : update retries.
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100927 */
928
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100929 if (prev_srv != objt_server(s->target)) {
Willy Tarreaueee5b512015-04-03 23:46:31 +0200930 if (s->txn && (s->txn->flags & TX_CK_MASK) == TX_CK_VALID) {
931 s->txn->flags &= ~TX_CK_MASK;
932 s->txn->flags |= TX_CK_DOWN;
Willy Tarreau7c669d72008-06-20 15:04:11 +0200933 }
Willy Tarreaue7dff022015-04-03 01:14:29 +0200934 s->flags |= SF_REDISP;
Olivier Houchard237f7812019-03-08 18:49:07 +0100935 _HA_ATOMIC_ADD(&prev_srv->counters.redispatches, 1);
936 _HA_ATOMIC_ADD(&s->be->be_counters.redispatches, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +0200937 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +0100938 _HA_ATOMIC_ADD(&prev_srv->counters.retries, 1);
939 _HA_ATOMIC_ADD(&s->be->be_counters.retries, 1);
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100940 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +0100941 }
942 }
943
Willy Tarreaubaaee002006-06-26 02:48:02 +0200944 switch (err) {
945 case SRV_STATUS_OK:
Willy Tarreaue7dff022015-04-03 01:14:29 +0200946 /* we have SF_ASSIGNED set */
Willy Tarreau3fdb3662012-11-12 00:42:33 +0100947 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +0100948 if (!srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200949 return SRV_STATUS_OK; /* dispatch or proxy mode */
950
951 /* If we already have a connection slot, no need to check any queue */
Willy Tarreau827aee92011-03-10 16:55:02 +0100952 if (s->srv_conn == srv)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200953 return SRV_STATUS_OK;
954
Willy Tarreau87b09662015-04-03 00:22:06 +0200955 /* OK, this stream already has an assigned server, but no
Willy Tarreau7c669d72008-06-20 15:04:11 +0200956 * connection slot yet. Either it is a redispatch, or it was
957 * assigned from persistence information (direct mode).
958 */
Willy Tarreaue7dff022015-04-03 01:14:29 +0200959 if ((s->flags & SF_REDIRECTABLE) && srv->rdr_len) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200960 /* server scheduled for redirection, and already assigned. We
961 * don't want to go further nor check the queue.
Willy Tarreau21d2af32008-02-14 20:25:24 +0100962 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100963 sess_change_server(s, srv); /* not really needed in fact */
Willy Tarreau21d2af32008-02-14 20:25:24 +0100964 return SRV_STATUS_OK;
965 }
966
Willy Tarreau87b09662015-04-03 00:22:06 +0200967 /* We might have to queue this stream if the assigned server is full.
Willy Tarreau7c669d72008-06-20 15:04:11 +0200968 * We know we have to queue it into the server's queue, so if a maxqueue
969 * is set on the server, we must also check that the server's queue is
970 * not full, in which case we have to return FULL.
971 */
Willy Tarreau827aee92011-03-10 16:55:02 +0100972 if (srv->maxconn &&
973 (srv->nbpend || srv->served >= srv_dynamic_maxconn(srv))) {
Willy Tarreau7c669d72008-06-20 15:04:11 +0200974
Willy Tarreau827aee92011-03-10 16:55:02 +0100975 if (srv->maxqueue > 0 && srv->nbpend >= srv->maxqueue)
Willy Tarreau7c669d72008-06-20 15:04:11 +0200976 return SRV_STATUS_FULL;
977
Willy Tarreaubaaee002006-06-26 02:48:02 +0200978 p = pendconn_add(s);
979 if (p)
980 return SRV_STATUS_QUEUED;
981 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200982 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200983 }
Willy Tarreau7c669d72008-06-20 15:04:11 +0200984
985 /* OK, we can use this server. Let's reserve our place */
Willy Tarreau827aee92011-03-10 16:55:02 +0100986 sess_change_server(s, srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +0200987 return SRV_STATUS_OK;
988
989 case SRV_STATUS_FULL:
Willy Tarreau87b09662015-04-03 00:22:06 +0200990 /* queue this stream into the proxy's queue */
Willy Tarreaubaaee002006-06-26 02:48:02 +0200991 p = pendconn_add(s);
992 if (p)
993 return SRV_STATUS_QUEUED;
994 else
Willy Tarreau7c669d72008-06-20 15:04:11 +0200995 return SRV_STATUS_INTERNAL;
Willy Tarreaubaaee002006-06-26 02:48:02 +0200996
997 case SRV_STATUS_NOSRV:
Willy Tarreau7c669d72008-06-20 15:04:11 +0200998 return err;
999
Willy Tarreaubaaee002006-06-26 02:48:02 +02001000 case SRV_STATUS_INTERNAL:
1001 return err;
Willy Tarreau7c669d72008-06-20 15:04:11 +02001002
Willy Tarreaubaaee002006-06-26 02:48:02 +02001003 default:
1004 return SRV_STATUS_INTERNAL;
1005 }
Willy Tarreau5b6995c2008-01-13 16:31:17 +01001006}
Willy Tarreaubaaee002006-06-26 02:48:02 +02001007
Willy Tarreaub1d67742010-03-29 19:36:59 +02001008/* If an explicit source binding is specified on the server and/or backend, and
1009 * this source makes use of the transparent proxy, then it is extracted now and
Willy Tarreau87b09662015-04-03 00:22:06 +02001010 * assigned to the stream's pending connection. This function assumes that an
Willy Tarreau350f4872014-11-28 14:42:25 +01001011 * outgoing connection has already been assigned to s->si[1].end.
Willy Tarreaub1d67742010-03-29 19:36:59 +02001012 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001013static void assign_tproxy_address(struct stream *s)
Willy Tarreaub1d67742010-03-29 19:36:59 +02001014{
Willy Tarreau29fbe512015-08-20 19:35:14 +02001015#if defined(CONFIG_HAP_TRANSPARENT)
Willy Tarreau3fdb3662012-11-12 00:42:33 +01001016 struct server *srv = objt_server(s->target);
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001017 struct conn_src *src;
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001018 struct connection *cli_conn;
Olivier Houchard09a0f032019-01-17 15:59:13 +01001019 struct connection *srv_conn;
1020
1021 if (objt_cs(s->si[1].end))
1022 srv_conn = cs_conn(__objt_cs(s->si[1].end));
1023 else
1024 srv_conn = objt_conn(s->si[1].end);
Willy Tarreau827aee92011-03-10 16:55:02 +01001025
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001026 if (srv && srv->conn_src.opts & CO_SRC_BIND)
1027 src = &srv->conn_src;
1028 else if (s->be->conn_src.opts & CO_SRC_BIND)
1029 src = &s->be->conn_src;
1030 else
1031 return;
Willy Tarreau294c4732011-12-16 21:35:50 +01001032
Willy Tarreauca79f592019-07-17 19:04:47 +02001033 if (!sockaddr_alloc(&srv_conn->src))
1034 return;
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001035
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001036 switch (src->opts & CO_SRC_TPROXY_MASK) {
1037 case CO_SRC_TPROXY_ADDR:
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001038 *srv_conn->src = src->tproxy_addr;
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001039 break;
1040 case CO_SRC_TPROXY_CLI:
1041 case CO_SRC_TPROXY_CIP:
1042 /* FIXME: what can we do if the client connects in IPv6 or unix socket ? */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001043 cli_conn = objt_conn(strm_orig(s));
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001044 if (cli_conn && conn_get_src(cli_conn))
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001045 *srv_conn->src = *cli_conn->src;
1046 else {
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001047 sockaddr_free(&srv_conn->src);
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001048 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001049 break;
1050 case CO_SRC_TPROXY_DYN:
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001051 if (src->bind_hdr_occ && IS_HTX_STRM(s)) {
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001052 char *vptr;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001053 size_t vlen;
Willy Tarreau294c4732011-12-16 21:35:50 +01001054
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001055 /* bind to the IP in a header */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001056 ((struct sockaddr_in *)srv_conn->src)->sin_family = AF_INET;
1057 ((struct sockaddr_in *)srv_conn->src)->sin_port = 0;
1058 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr = 0;
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001059 if (http_get_htx_hdr(htxbuf(&s->req.buf),
1060 ist2(src->bind_hdr_name, src->bind_hdr_len),
1061 src->bind_hdr_occ, NULL, &vptr, &vlen)) {
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001062 ((struct sockaddr_in *)srv_conn->src)->sin_addr.s_addr =
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001063 htonl(inetaddr_host_lim(vptr, vptr + vlen));
Willy Tarreaubce70882009-09-07 11:51:47 +02001064 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001065 }
Willy Tarreau9cd7d6c2012-12-08 23:13:33 +01001066 break;
1067 default:
Willy Tarreau16aa4af2019-07-18 11:16:41 +02001068 sockaddr_free(&srv_conn->src);
Willy Tarreaub1d67742010-03-29 19:36:59 +02001069 }
1070#endif
1071}
1072
Olivier Houchard566df302020-03-06 18:18:56 +01001073/* Attempt to get a backend connection from the specified mt_list array
1074 * (safe or idle connections).
1075 */
1076static struct connection *conn_backend_get(struct server *srv, int is_safe)
1077{
1078 struct mt_list *mt_list = is_safe ? srv->safe_conns : srv->idle_conns;
1079 struct connection *conn;
1080 int i;
1081 int found = 0;
1082
1083 /* We need to lock even if this is our own list, because another
1084 * thread may be trying to migrate that connection, and we don't want
1085 * to end up with two threads using the same connection.
1086 */
1087 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
1088 conn = MT_LIST_POP(&mt_list[tid], struct connection *, list);
1089 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
1090
1091 /* If we found a connection in our own list, and we don't have to
1092 * steal one from another thread, then we're done.
1093 */
Olivier Houchardfdc7ee22020-03-19 23:52:28 +01001094 if (conn) {
1095 i = tid;
1096 goto fix_conn;
1097 }
Olivier Houchard566df302020-03-06 18:18:56 +01001098
1099 /* Lookup all other threads for an idle connection, starting from tid + 1 */
1100 for (i = tid; !found && (i = ((i + 1 == global.nbthread) ? 0 : i + 1)) != tid;) {
1101 struct mt_list *elt1, elt2;
1102
1103 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[i]);
1104 mt_list_for_each_entry_safe(conn, &mt_list[i], list, elt1, elt2) {
1105 if (conn->mux->takeover && conn->mux->takeover(conn) == 0) {
1106 MT_LIST_DEL_SAFE(elt1);
1107 found = 1;
1108 break;
1109 }
1110 }
1111 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[i]);
1112 }
1113
1114 if (!found)
1115 conn = NULL;
1116 else {
Olivier Houchardfdc7ee22020-03-19 23:52:28 +01001117fix_conn:
Olivier Houchard566df302020-03-06 18:18:56 +01001118 conn->idle_time = 0;
1119 _HA_ATOMIC_SUB(&srv->curr_idle_conns, 1);
1120 _HA_ATOMIC_SUB(&srv->curr_idle_thr[i], 1);
1121 _HA_ATOMIC_SUB(is_safe ? &srv->curr_safe_nb : &srv->curr_idle_nb, 1);
1122 __ha_barrier_atomic_store();
1123 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&conn->list));
1124 }
1125 return conn;
1126}
1127
Willy Tarreaubaaee002006-06-26 02:48:02 +02001128/*
Willy Tarreau87b09662015-04-03 00:22:06 +02001129 * This function initiates a connection to the server assigned to this stream
Willy Tarreau350f4872014-11-28 14:42:25 +01001130 * (s->target, s->si[1].addr.to). It will assign a server if none
Willy Tarreau664beb82011-03-10 11:38:29 +01001131 * is assigned yet.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001132 * It can return one of :
Willy Tarreaue7dff022015-04-03 01:14:29 +02001133 * - SF_ERR_NONE if everything's OK
1134 * - SF_ERR_SRVTO if there are no more servers
1135 * - SF_ERR_SRVCL if the connection was refused by the server
1136 * - SF_ERR_PRXCOND if the connection has been limited by the proxy (maxconn)
1137 * - SF_ERR_RESOURCE if a system resource is lacking (eg: fd limits, ports, ...)
1138 * - SF_ERR_INTERNAL for any other purely internal errors
Tim Düsterhus4896c442016-11-29 02:15:19 +01001139 * Additionally, in the case of SF_ERR_RESOURCE, an emergency log will be emitted.
Willy Tarreaub363a1f2013-10-01 10:45:07 +02001140 * The server-facing stream interface is expected to hold a pre-allocated connection
Willy Tarreau350f4872014-11-28 14:42:25 +01001141 * in s->si[1].conn.
Willy Tarreaubaaee002006-06-26 02:48:02 +02001142 */
Willy Tarreau87b09662015-04-03 00:22:06 +02001143int connect_server(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001144{
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001145 struct connection *cli_conn = objt_conn(strm_orig(s));
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001146 struct connection *srv_conn = NULL;
Olivier Houchard2442f682018-12-01 17:03:38 +01001147 struct conn_stream *srv_cs = NULL;
Willy Tarreaub0821862019-07-18 19:26:11 +02001148 struct sess_srv_list *srv_list;
Willy Tarreau827aee92011-03-10 16:55:02 +01001149 struct server *srv;
Willy Tarreau34601a82013-12-15 16:33:46 +01001150 int reuse = 0;
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001151 int reuse_orphan = 0;
Olivier Houchard5cd62172019-01-04 15:52:26 +01001152 int init_mux = 0;
Willy Tarreau9650f372009-08-16 14:02:45 +02001153 int err;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001154
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001155
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001156 /* This will catch some corner cases such as lying connections resulting from
1157 * retries or connect timeouts but will rarely trigger.
Olivier Houchard0fa989f2018-12-05 17:08:55 +01001158 */
Willy Tarreaua5797aa2019-07-18 18:40:06 +02001159 si_release_endpoint(&s->si[1]);
1160
Willy Tarreaub0821862019-07-18 19:26:11 +02001161 /* first, search for a matching connection in the session's idle conns */
1162 list_for_each_entry(srv_list, &s->sess->srv_list, srv_list) {
1163 if (srv_list->target == s->target) {
1164 list_for_each_entry(srv_conn, &srv_list->conn_list, session_list) {
1165 if (conn_xprt_ready(srv_conn) &&
1166 srv_conn->mux && (srv_conn->mux->avail_streams(srv_conn) > 0)) {
1167 reuse = 1;
1168 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001169 }
1170 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001171 break;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001172 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001173 }
Olivier Houchard351411f2018-12-27 17:20:54 +01001174
Olivier Houchard2444aa52020-01-20 13:56:01 +01001175 if (!reuse)
Willy Tarreaub0821862019-07-18 19:26:11 +02001176 srv_conn = NULL;
Olivier Houchard00cf70f2018-11-30 17:24:55 +01001177
Willy Tarreau7b004922015-08-04 19:34:21 +02001178 srv = objt_server(s->target);
Willy Tarreau34601a82013-12-15 16:33:46 +01001179
Willy Tarreau8dff9982015-08-04 20:45:52 +02001180 if (srv && !reuse) {
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001181 srv_conn = NULL;
Willy Tarreau8dff9982015-08-04 20:45:52 +02001182
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001183 /* Below we pick connections from the safe, idle or
1184 * available (which are safe too) lists based
Willy Tarreau449d74a2015-08-05 17:16:33 +02001185 * on the strategy, the fact that this is a first or second
1186 * (retryable) request, with the indicated priority (1 or 2) :
1187 *
1188 * SAFE AGGR ALWS
1189 *
1190 * +-----+-----+ +-----+-----+ +-----+-----+
1191 * req| 1st | 2nd | req| 1st | 2nd | req| 1st | 2nd |
1192 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1193 * safe| - | 2 | safe| 1 | 2 | safe| 1 | 2 |
1194 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
1195 * idle| - | 1 | idle| - | 1 | idle| 2 | 1 |
1196 * ----+-----+-----+ ----+-----+-----+ ----+-----+-----+
Willy Tarreaub0821862019-07-18 19:26:11 +02001197 *
1198 * Idle conns are necessarily looked up on the same thread so
1199 * that there is no concurrency issues.
Willy Tarreau449d74a2015-08-05 17:16:33 +02001200 */
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001201 if (srv->available_conns && !LIST_ISEMPTY(&srv->available_conns[tid]) &&
Olivier Houchard566df302020-03-06 18:18:56 +01001202 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR)) {
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001203 srv_conn = LIST_ELEM(srv->available_conns[tid].n, struct connection *, list);
Olivier Houchard566df302020-03-06 18:18:56 +01001204 reuse = 1;
Willy Tarreau449d74a2015-08-05 17:16:33 +02001205 }
Olivier Houchard566df302020-03-06 18:18:56 +01001206 else if (!srv_conn && srv->curr_idle_conns > 0) {
1207 if (srv->idle_conns &&
1208 ((s->be->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR &&
1209 s->txn && (s->txn->flags & TX_NOT_FIRST)) &&
1210 srv->curr_idle_nb > 0) {
1211 srv_conn = conn_backend_get(srv, 0);
1212 }
1213 else if (srv->safe_conns &&
1214 ((s->txn && (s->txn->flags & TX_NOT_FIRST)) ||
1215 (s->be->options & PR_O_REUSE_MASK) >= PR_O_REUSE_AGGR) &&
1216 srv->curr_safe_nb > 0) {
1217 srv_conn = conn_backend_get(srv, 1);
1218 }
1219 else if (srv->idle_conns &&
1220 ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
1221 srv->curr_idle_nb > 0) {
1222 srv_conn = conn_backend_get(srv, 0);
1223 }
1224 /* If we've picked a connection from the pool, we now have to
1225 * detach it. We may have to get rid of the previous idle
1226 * connection we had, so for this we try to swap it with the
1227 * other owner's. That way it may remain alive for others to
1228 * pick.
1229 */
1230 if (srv_conn) {
1231 reuse_orphan = 1;
1232 reuse = 1;
1233 srv_conn->flags &= ~CO_FL_LIST_MASK;
1234 }
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001235 }
Willy Tarreau8dff9982015-08-04 20:45:52 +02001236 }
1237
Willy Tarreaub0821862019-07-18 19:26:11 +02001238
1239 /* here reuse might have been set above, indicating srv_conn finally
1240 * is OK.
1241 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001242 if (reuse) {
1243 /* Disable connection reuse if a dynamic source is used.
1244 * As long as we don't share connections between servers,
1245 * we don't need to disable connection reuse on no-idempotent
1246 * requests nor when PROXY protocol is used.
1247 */
Willy Tarreau34601a82013-12-15 16:33:46 +01001248 if (srv && srv->conn_src.opts & CO_SRC_BIND) {
1249 if ((srv->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1250 reuse = 0;
1251 }
1252 else if (s->be->conn_src.opts & CO_SRC_BIND) {
1253 if ((s->be->conn_src.opts & CO_SRC_TPROXY_MASK) == CO_SRC_TPROXY_DYN)
1254 reuse = 0;
1255 }
1256 }
Willy Tarreaub0821862019-07-18 19:26:11 +02001257
Olivier Houchardb3397362020-03-16 13:49:00 +01001258 if (ha_used_fds > global.tune.pool_high_count && srv && srv->idle_conns) {
Olivier Houchard88698d92019-04-16 19:07:22 +02001259 struct connection *tokill_conn;
1260
1261 /* We can't reuse a connection, and e have more FDs than deemd
1262 * acceptable, attempt to kill an idling connection
1263 */
1264 /* First, try from our own idle list */
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001265 tokill_conn = MT_LIST_POP(&srv->idle_conns[tid],
Olivier Houchard88698d92019-04-16 19:07:22 +02001266 struct connection *, list);
1267 if (tokill_conn)
1268 tokill_conn->mux->destroy(tokill_conn->ctx);
1269 /* If not, iterate over other thread's idling pool, and try to grab one */
1270 else {
1271 int i;
1272
1273 for (i = 0; i < global.nbthread; i++) {
1274 if (i == tid)
1275 continue;
Willy Tarreau08e2b412019-05-26 11:50:08 +02001276
1277 // just silence stupid gcc which reports an absurd
1278 // out-of-bounds warning for <i> which is always
1279 // exactly zero without threads, but it seems to
1280 // see it possibly larger.
1281 ALREADY_CHECKED(i);
1282
Olivier Houchard14023742019-12-30 18:15:40 +01001283 HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001284 tokill_conn = MT_LIST_POP(&srv->idle_conns[i],
Olivier Houchard88698d92019-04-16 19:07:22 +02001285 struct connection *, list);
Olivier Houcharddc2f2752020-02-13 19:12:07 +01001286 if (!tokill_conn)
1287 tokill_conn = MT_LIST_POP(&srv->safe_conns[i],
1288 struct connection *, list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001289 if (tokill_conn) {
1290 /* We got one, put it into the concerned thread's to kill list, and wake it's kill task */
1291
Olivier Houchard859dc802019-08-08 15:47:21 +02001292 MT_LIST_ADDQ(&toremove_connections[i],
1293 (struct mt_list *)&tokill_conn->list);
Olivier Houchard88698d92019-04-16 19:07:22 +02001294 task_wakeup(idle_conn_cleanup[i], TASK_WOKEN_OTHER);
Olivier Houchard849d4f02020-01-31 17:22:08 +01001295 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001296 break;
1297 }
Olivier Houchard14023742019-12-30 18:15:40 +01001298 HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
Olivier Houchard88698d92019-04-16 19:07:22 +02001299 }
1300 }
1301
1302 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001303 /* If we're really reusing the connection, remove it from the orphan
1304 * list and add it back to the idle list.
1305 */
Christopher Faulet46451d62019-04-19 15:39:22 +02001306 if (reuse) {
Olivier Houchard566df302020-03-06 18:18:56 +01001307 if (!reuse_orphan) {
Christopher Faulet46451d62019-04-19 15:39:22 +02001308 if (srv_conn->flags & CO_FL_SESS_IDLE) {
1309 struct session *sess = srv_conn->owner;
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001310
Christopher Faulet46451d62019-04-19 15:39:22 +02001311 srv_conn->flags &= ~CO_FL_SESS_IDLE;
1312 sess->idle_conns--;
1313 }
Olivier Houcharda2dbeb22018-12-28 18:50:57 +01001314 }
Olivier Houchard0c18a6f2018-12-02 14:11:41 +01001315 }
Willy Tarreau34601a82013-12-15 16:33:46 +01001316
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001317 if (reuse) {
Willy Tarreaub0821862019-07-18 19:26:11 +02001318 if (srv_conn->mux) {
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001319 int avail = srv_conn->mux->avail_streams(srv_conn);
1320
1321 if (avail <= 1) {
Olivier Houchard2442f682018-12-01 17:03:38 +01001322 /* No more streams available, remove it from the list */
Olivier Houchardf0d4dff2020-03-06 18:12:03 +01001323 MT_LIST_DEL(&srv_conn->list);
Olivier Houchard2442f682018-12-01 17:03:38 +01001324 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001325
1326 if (avail >= 1) {
1327 srv_cs = srv_conn->mux->attach(srv_conn, s->sess);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001328 if (srv_cs)
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001329 si_attach_cs(&s->si[1], srv_cs);
Olivier Houchard2444aa52020-01-20 13:56:01 +01001330 else
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001331 srv_conn = NULL;
1332 }
Olivier Houchard134a2042018-12-28 14:45:47 +01001333 else
1334 srv_conn = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001335 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001336 /* otherwise srv_conn is left intact */
1337 }
1338 else
1339 srv_conn = NULL;
1340
1341 /* no reuse or failed to reuse the connection above, pick a new one */
1342 if (!srv_conn) {
1343 srv_conn = conn_new();
Willy Tarreau1da41ec2019-02-01 16:38:48 +01001344 if (srv_conn)
1345 srv_conn->target = s->target;
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001346 srv_cs = NULL;
Olivier Houchard7c6f8b12018-11-13 16:48:36 +01001347 }
Willy Tarreau2c7dedd2019-01-24 18:22:19 +01001348
Olivier Houchardcf612a02020-03-25 19:41:03 +01001349 if (srv_conn && srv) {
1350 _HA_ATOMIC_ADD(&srv->curr_used_conns, 1);
1351 /* It's ok not to do that atomically, we don't need an
1352 * exact max.
1353 */
1354 if (srv->max_used_conns < srv->curr_used_conns)
1355 srv->max_used_conns = srv->curr_used_conns;
1356 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001357 if (!srv_conn || !sockaddr_alloc(&srv_conn->dst)) {
1358 if (srv_conn)
1359 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001360 return SF_ERR_RESOURCE;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001361 }
Willy Tarreau32e3c6a2013-10-11 19:34:20 +02001362
Willy Tarreaue7dff022015-04-03 01:14:29 +02001363 if (!(s->flags & SF_ADDR_SET)) {
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001364 err = assign_server_address(s);
Olivier Houchardc0caac22020-03-20 14:26:32 +01001365 if (err != SRV_STATUS_OK) {
1366 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001367 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001368 }
Willy Tarreaubaaee002006-06-26 02:48:02 +02001369 }
1370
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001371 /* copy the target address into the connection */
1372 *srv_conn->dst = *s->target_addr;
1373
1374 /* Copy network namespace from client connection */
1375 srv_conn->proxy_netns = cli_conn ? cli_conn->proxy_netns : NULL;
1376
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001377 if (!conn_xprt_ready(srv_conn) && !srv_conn->mux) {
Willy Tarreauff605db2013-12-20 11:09:51 +01001378 /* set the correct protocol on the output stream interface */
Christopher Faulet2bf88c02018-02-28 10:33:34 +01001379 if (srv)
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001380 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), srv->xprt);
Willy Tarreauff605db2013-12-20 11:09:51 +01001381 else if (obj_type(s->target) == OBJ_TYPE_PROXY) {
1382 /* proxies exclusively run on raw_sock right now */
Willy Tarreauc0e16f22019-07-17 18:16:30 +02001383 conn_prepare(srv_conn, protocol_by_family(srv_conn->dst->ss_family), xprt_get(XPRT_RAW));
Olivier Houchardc0caac22020-03-20 14:26:32 +01001384 if (!(srv_conn->ctrl)) {
1385 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001386 return SF_ERR_INTERNAL;
Olivier Houchardc0caac22020-03-20 14:26:32 +01001387 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001388 }
Olivier Houchardc0caac22020-03-20 14:26:32 +01001389 else {
1390 conn_free(srv_conn);
Willy Tarreaue7dff022015-04-03 01:14:29 +02001391 return SF_ERR_INTERNAL; /* how did we get there ? */
Olivier Houchardc0caac22020-03-20 14:26:32 +01001392 }
Willy Tarreaud02394b2012-05-11 18:32:18 +02001393
Olivier Houchard8af03b32020-01-22 17:34:54 +01001394 srv_cs = si_alloc_cs(&s->si[1], srv_conn);
1395 if (!srv_cs) {
1396 conn_free(srv_conn);
1397 return SF_ERR_RESOURCE;
1398 }
1399 srv_conn->ctx = srv_cs;
Olivier Houchardecffb7d2020-01-24 14:10:55 +01001400#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
Olivier Houchard12950162018-11-23 14:32:08 +01001401 if (!srv ||
1402 ((!(srv->ssl_ctx.alpn_str) && !(srv->ssl_ctx.npn_str)) ||
Olivier Houchardb4a8b2c2019-06-15 00:13:15 +02001403 srv->mux_proto || s->be->mode != PR_MODE_HTTP))
Olivier Houchard201b9f42018-11-21 00:16:29 +01001404#endif
Olivier Houchard5cd62172019-01-04 15:52:26 +01001405 init_mux = 1;
Olivier Houchard68ad53c2020-05-27 01:26:06 +02001406#if defined(USE_OPENSSL) && defined(TLSEXT_TYPE_application_layer_protocol_negotiation)
1407 else
1408 srv_conn->owner = s->sess;
1409#endif
Willy Tarreauff605db2013-12-20 11:09:51 +01001410 /* process the case where the server requires the PROXY protocol to be sent */
1411 srv_conn->send_proxy_ofs = 0;
Olivier Houchard522eea72017-11-03 16:27:47 +01001412
Willy Tarreau7b004922015-08-04 19:34:21 +02001413 if (srv && srv->pp_opts) {
Willy Tarreau387ebf82015-08-04 19:24:13 +02001414 srv_conn->flags |= CO_FL_PRIVATE;
Alexander Liu2a54bb72019-05-22 19:44:48 +08001415 srv_conn->flags |= CO_FL_SEND_PROXY;
Willy Tarreauff605db2013-12-20 11:09:51 +01001416 srv_conn->send_proxy_ofs = 1; /* must compute size */
Willy Tarreauff605db2013-12-20 11:09:51 +01001417 if (cli_conn)
Willy Tarreau3cc01d82019-07-17 11:27:38 +02001418 conn_get_dst(cli_conn);
Willy Tarreauff605db2013-12-20 11:09:51 +01001419 }
Willy Tarreau2a6e8802013-10-24 15:50:53 +02001420
Willy Tarreauff605db2013-12-20 11:09:51 +01001421 assign_tproxy_address(s);
Alexander Liu2a54bb72019-05-22 19:44:48 +08001422
1423 if (srv && (srv->flags & SRV_F_SOCKS4_PROXY)) {
1424 srv_conn->send_proxy_ofs = 1;
1425 srv_conn->flags |= CO_FL_SOCKS4;
1426 }
Willy Tarreauff605db2013-12-20 11:09:51 +01001427 }
Olivier Houchard9a86fcb2018-12-11 16:47:14 +01001428 else if (!conn_xprt_ready(srv_conn)) {
1429 if (srv_conn->mux->reset)
1430 srv_conn->mux->reset(srv_conn);
1431 }
Olivier Houcharde8f5f5d2019-10-25 17:00:54 +02001432 else {
1433 /* Only consider we're doing reuse if the connection was
1434 * ready.
1435 */
1436 if (srv_conn->mux->ctl(srv_conn, MUX_STATUS, NULL) & MUX_STATUS_READY)
1437 s->flags |= SF_SRV_REUSED;
1438 }
Willy Tarreaub1d67742010-03-29 19:36:59 +02001439
William Lallemandb7ff6a32012-03-02 14:35:21 +01001440 /* flag for logging source ip/port */
Willy Tarreaud0d8da92015-04-04 02:10:38 +02001441 if (strm_fe(s)->options2 & PR_O2_SRC_ADDR)
Willy Tarreau350f4872014-11-28 14:42:25 +01001442 s->si[1].flags |= SI_FL_SRC_ADDR;
William Lallemandb7ff6a32012-03-02 14:35:21 +01001443
Willy Tarreau14f8e862012-08-30 22:23:13 +02001444 /* disable lingering */
1445 if (s->be->options & PR_O_TCP_NOLING)
Willy Tarreau350f4872014-11-28 14:42:25 +01001446 s->si[1].flags |= SI_FL_NOLINGER;
Willy Tarreau14f8e862012-08-30 22:23:13 +02001447
Willy Tarreauf1573842018-12-14 11:35:36 +01001448 if (s->flags & SF_SRV_REUSED) {
Olivier Houchard237f7812019-03-08 18:49:07 +01001449 _HA_ATOMIC_ADD(&s->be->be_counters.reuse, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001450 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001451 _HA_ATOMIC_ADD(&srv->counters.reuse, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001452 } else {
Olivier Houchard237f7812019-03-08 18:49:07 +01001453 _HA_ATOMIC_ADD(&s->be->be_counters.connect, 1);
Willy Tarreaucc79ed22018-12-15 15:11:36 +01001454 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001455 _HA_ATOMIC_ADD(&srv->counters.connect, 1);
Willy Tarreauf1573842018-12-14 11:35:36 +01001456 }
1457
Olivier Houchard201b9f42018-11-21 00:16:29 +01001458 err = si_connect(&s->si[1], srv_conn);
Willy Tarreau09e02032019-07-18 16:18:20 +02001459 if (err != SF_ERR_NONE)
1460 return err;
1461
Olivier Houchard5cd62172019-01-04 15:52:26 +01001462 /* We have to defer the mux initialization until after si_connect()
1463 * has been called, as we need the xprt to have been properly
1464 * initialized, or any attempt to recv during the mux init may
1465 * fail, and flag the connection as CO_FL_ERROR.
1466 */
1467 if (init_mux) {
Olivier Houchard74931142019-01-29 19:11:16 +01001468 if (conn_install_mux_be(srv_conn, srv_cs, s->sess) < 0) {
1469 conn_full_close(srv_conn);
Olivier Houchard5cd62172019-01-04 15:52:26 +01001470 return SF_ERR_INTERNAL;
Olivier Houchard74931142019-01-29 19:11:16 +01001471 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001472 /* If we're doing http-reuse always, and the connection
1473 * is an http2 connection, add it to the available list,
1474 * so that others can use it right away.
1475 */
1476 if (srv && ((s->be->options & PR_O_REUSE_MASK) == PR_O_REUSE_ALWS) &&
1477 srv_conn->mux->avail_streams(srv_conn) > 0)
Olivier Houchardf0d4dff2020-03-06 18:12:03 +01001478 LIST_ADDQ(&srv->available_conns[tid], mt_list_to_list(&srv_conn->list));
Olivier Houchard5cd62172019-01-04 15:52:26 +01001479 }
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001480 /* The CO_FL_SEND_PROXY flag may have been set by the connect method,
1481 * if so, add our handshake pseudo-XPRT now.
1482 */
Willy Tarreau4450b582020-01-23 15:23:13 +01001483 if ((srv_conn->flags & CO_FL_HANDSHAKE)) {
Olivier Houchardfe50bfb2019-05-27 12:09:19 +02001484 if (xprt_add_hs(srv_conn) < 0) {
1485 conn_full_close(srv_conn);
1486 return SF_ERR_INTERNAL;
1487 }
1488 }
Olivier Houchard5cd62172019-01-04 15:52:26 +01001489
Willy Tarreaubaaee002006-06-26 02:48:02 +02001490
Willy Tarreau5db847a2019-05-09 14:13:35 +02001491#if USE_OPENSSL && (defined(OPENSSL_IS_BORINGSSL) || (HA_OPENSSL_VERSION_NUMBER >= 0x10101000L))
Olivier Houchard4cd2af42019-05-06 15:18:27 +02001492
Olivier Houchard8694e5b2019-06-15 00:14:05 +02001493 if (!reuse && cli_conn && srv && srv_conn->mux &&
Olivier Houchard522eea72017-11-03 16:27:47 +01001494 (srv->ssl_ctx.options & SRV_SSL_O_EARLY_DATA) &&
Olivier Houchard865d8392019-05-03 22:46:27 +02001495 /* Only attempt to use early data if either the client sent
1496 * early data, so that we know it can handle a 425, or if
1497 * we are allwoed to retry requests on early data failure, and
1498 * it's our first try
1499 */
1500 ((cli_conn->flags & CO_FL_EARLY_DATA) ||
1501 ((s->be->retry_type & PR_RE_EARLY_ERROR) &&
1502 s->si[1].conn_retries == s->be->conn_retries)) &&
1503 !channel_is_empty(si_oc(&s->si[1])) &&
1504 srv_conn->flags & CO_FL_SSL_WAIT_HS)
Olivier Houchard522eea72017-11-03 16:27:47 +01001505 srv_conn->flags &= ~(CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN);
Willy Tarreau46c9d3e2017-11-08 14:25:59 +01001506#endif
Olivier Houchard522eea72017-11-03 16:27:47 +01001507
Willy Tarreau14f8e862012-08-30 22:23:13 +02001508 /* set connect timeout */
Willy Tarreau350f4872014-11-28 14:42:25 +01001509 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.connect);
Willy Tarreau14f8e862012-08-30 22:23:13 +02001510
Willy Tarreau827aee92011-03-10 16:55:02 +01001511 if (srv) {
Christopher Faulet29f77e82017-06-08 14:04:45 +02001512 int count;
1513
Willy Tarreaue7dff022015-04-03 01:14:29 +02001514 s->flags |= SF_CURR_SESS;
Olivier Houchard237f7812019-03-08 18:49:07 +01001515 count = _HA_ATOMIC_ADD(&srv->cur_sess, 1);
Christopher Faulet29f77e82017-06-08 14:04:45 +02001516 HA_ATOMIC_UPDATE_MAX(&srv->counters.cur_sess_max, count);
Willy Tarreau51406232008-03-10 22:04:20 +01001517 if (s->be->lbprm.server_take_conn)
Willy Tarreau827aee92011-03-10 16:55:02 +01001518 s->be->lbprm.server_take_conn(srv);
Willy Tarreau732eac42015-07-09 11:40:25 +02001519
1520#ifdef USE_OPENSSL
1521 if (srv->ssl_ctx.sni) {
1522 struct sample *smp;
Willy Tarreau732eac42015-07-09 11:40:25 +02001523
Christopher Faulet7d37fbb2019-07-15 15:37:57 +02001524 smp = sample_fetch_as_type(s->be, s->sess, s, SMP_OPT_DIR_REQ | SMP_OPT_FINAL,
1525 srv->ssl_ctx.sni, SMP_T_STR);
Willy Tarreau2e0565c2016-08-09 11:55:21 +02001526 if (smp_make_safe(smp)) {
Willy Tarreau843b7cb2018-07-13 10:54:26 +02001527 ssl_sock_set_servername(srv_conn,
1528 smp->data.u.str.area);
Willy Tarreau387ebf82015-08-04 19:24:13 +02001529 srv_conn->flags |= CO_FL_PRIVATE;
Willy Tarreau732eac42015-07-09 11:40:25 +02001530 }
1531 }
1532#endif /* USE_OPENSSL */
1533
Willy Tarreaubaaee002006-06-26 02:48:02 +02001534 }
1535
Willy Tarreauada4c582020-03-04 16:42:03 +01001536 /* Now handle synchronously connected sockets. We know the stream-int
1537 * is at least in state SI_ST_CON. These ones typically are UNIX
1538 * sockets, socket pairs, and occasionally TCP connections on the
1539 * loopback on a heavily loaded system.
1540 */
1541 if ((srv_conn->flags & CO_FL_ERROR || srv_cs->flags & CS_FL_ERROR))
1542 s->si[1].flags |= SI_FL_ERR;
1543
1544 /* If we had early data, and the handshake ended, then
1545 * we can remove the flag, and attempt to wake the task up,
1546 * in the event there's an analyser waiting for the end of
1547 * the handshake.
1548 */
1549 if (!(srv_conn->flags & (CO_FL_WAIT_XPRT | CO_FL_EARLY_SSL_HS)))
1550 srv_cs->flags &= ~CS_FL_WAIT_FOR_HS;
1551
1552 if (!si_state_in(s->si[1].state, SI_SB_EST|SI_SB_DIS|SI_SB_CLO) &&
1553 (srv_conn->flags & CO_FL_WAIT_XPRT) == 0) {
1554 s->si[1].exp = TICK_ETERNITY;
1555 si_oc(&s->si[1])->flags |= CF_WRITE_NULL;
1556 if (s->si[1].state == SI_ST_CON)
1557 s->si[1].state = SI_ST_RDY;
1558 }
1559
1560 /* Report EOI on the channel if it was reached from the mux point of
1561 * view.
1562 *
1563 * Note: This test is only required because si_cs_process is also the SI
1564 * wake callback. Otherwise si_cs_recv()/si_cs_send() already take
1565 * care of it.
1566 */
1567 if ((srv_cs->flags & CS_FL_EOI) && !(si_ic(&s->si[1])->flags & CF_EOI))
1568 si_ic(&s->si[1])->flags |= (CF_EOI|CF_READ_PARTIAL);
1569
Willy Tarreaue7dff022015-04-03 01:14:29 +02001570 return SF_ERR_NONE; /* connection is OK */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001571}
1572
1573
Willy Tarreaubaaee002006-06-26 02:48:02 +02001574/* This function performs the "redispatch" part of a connection attempt. It
1575 * will assign a server if required, queue the connection if required, and
1576 * handle errors that might arise at this level. It can change the server
1577 * state. It will return 1 if it encounters an error, switches the server
1578 * state, or has to queue a connection. Otherwise, it will return 0 indicating
1579 * that the connection is ready to use.
1580 */
1581
Willy Tarreau87b09662015-04-03 00:22:06 +02001582int srv_redispatch_connect(struct stream *s)
Willy Tarreaubaaee002006-06-26 02:48:02 +02001583{
Willy Tarreau827aee92011-03-10 16:55:02 +01001584 struct server *srv;
Willy Tarreaubaaee002006-06-26 02:48:02 +02001585 int conn_err;
1586
1587 /* We know that we don't have any connection pending, so we will
1588 * try to get a new one, and wait in this state if it's queued
1589 */
Willy Tarreau7c669d72008-06-20 15:04:11 +02001590 redispatch:
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001591 conn_err = assign_server_and_queue(s);
1592 srv = objt_server(s->target);
Willy Tarreau827aee92011-03-10 16:55:02 +01001593
Willy Tarreaubaaee002006-06-26 02:48:02 +02001594 switch (conn_err) {
1595 case SRV_STATUS_OK:
1596 break;
1597
Willy Tarreau7c669d72008-06-20 15:04:11 +02001598 case SRV_STATUS_FULL:
1599 /* The server has reached its maxqueue limit. Either PR_O_REDISP is set
1600 * and we can redispatch to another server, or it is not and we return
1601 * 503. This only makes sense in DIRECT mode however, because normal LB
1602 * algorithms would never select such a server, and hash algorithms
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001603 * would bring us on the same server again. Note that s->target is set
Willy Tarreau827aee92011-03-10 16:55:02 +01001604 * in this case.
Willy Tarreau7c669d72008-06-20 15:04:11 +02001605 */
Willy Tarreaue7dff022015-04-03 01:14:29 +02001606 if (((s->flags & (SF_DIRECT|SF_FORCE_PRST)) == SF_DIRECT) &&
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001607 (s->be->options & PR_O_REDISP)) {
Willy Tarreaue7dff022015-04-03 01:14:29 +02001608 s->flags &= ~(SF_DIRECT | SF_ASSIGNED | SF_ADDR_SET);
Willy Tarreau1c8d32b2019-07-18 15:47:45 +02001609 sockaddr_free(&s->target_addr);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001610 goto redispatch;
1611 }
1612
Willy Tarreau350f4872014-11-28 14:42:25 +01001613 if (!s->si[1].err_type) {
1614 s->si[1].err_type = SI_ET_QUEUE_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001615 }
Willy Tarreau7c669d72008-06-20 15:04:11 +02001616
Olivier Houchard237f7812019-03-08 18:49:07 +01001617 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1618 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreau7c669d72008-06-20 15:04:11 +02001619 return 1;
1620
Willy Tarreaubaaee002006-06-26 02:48:02 +02001621 case SRV_STATUS_NOSRV:
Willy Tarreau827aee92011-03-10 16:55:02 +01001622 /* note: it is guaranteed that srv == NULL here */
Willy Tarreau350f4872014-11-28 14:42:25 +01001623 if (!s->si[1].err_type) {
1624 s->si[1].err_type = SI_ET_CONN_ERR;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001625 }
Krzysztof Piotr Oledzki5a329cf2008-02-22 03:50:19 +01001626
Olivier Houchard237f7812019-03-08 18:49:07 +01001627 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001628 return 1;
1629
1630 case SRV_STATUS_QUEUED:
Willy Tarreau350f4872014-11-28 14:42:25 +01001631 s->si[1].exp = tick_add_ifset(now_ms, s->be->timeout.queue);
1632 s->si[1].state = SI_ST_QUE;
Willy Tarreau87b09662015-04-03 00:22:06 +02001633 /* do nothing else and do not wake any other stream up */
Willy Tarreaubaaee002006-06-26 02:48:02 +02001634 return 1;
1635
Willy Tarreaubaaee002006-06-26 02:48:02 +02001636 case SRV_STATUS_INTERNAL:
1637 default:
Willy Tarreau350f4872014-11-28 14:42:25 +01001638 if (!s->si[1].err_type) {
1639 s->si[1].err_type = SI_ET_CONN_OTHER;
Willy Tarreaufa7e1022008-10-19 07:30:41 +02001640 }
1641
Willy Tarreau827aee92011-03-10 16:55:02 +01001642 if (srv)
1643 srv_inc_sess_ctr(srv);
1644 if (srv)
Bhaskar Maddalaa20cb852014-02-03 16:26:46 -05001645 srv_set_sess_last(srv);
1646 if (srv)
Olivier Houchard237f7812019-03-08 18:49:07 +01001647 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1648 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001649
Willy Tarreau87b09662015-04-03 00:22:06 +02001650 /* release other streams waiting for this server */
Willy Tarreauf1fd9dc2014-04-24 20:47:57 +02001651 if (may_dequeue_tasks(srv, s->be))
Willy Tarreau827aee92011-03-10 16:55:02 +01001652 process_srv_queue(srv);
Willy Tarreaubaaee002006-06-26 02:48:02 +02001653 return 1;
1654 }
1655 /* if we get here, it's because we got SRV_STATUS_OK, which also
1656 * means that the connection has not been queued.
1657 */
1658 return 0;
1659}
1660
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001661/* Check if the connection request is in such a state that it can be aborted. */
1662static int back_may_abort_req(struct channel *req, struct stream *s)
1663{
1664 return ((req->flags & (CF_READ_ERROR)) ||
1665 ((req->flags & (CF_SHUTW_NOW|CF_SHUTW)) && /* empty and client aborted */
1666 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE))));
1667}
1668
1669/* Update back stream interface status for input states SI_ST_ASS, SI_ST_QUE,
1670 * SI_ST_TAR. Other input states are simply ignored.
1671 * Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON
1672 * and SI_ST_EST. Flags must have previously been updated for timeouts and other
1673 * conditions.
1674 */
1675void back_try_conn_req(struct stream *s)
1676{
1677 struct server *srv = objt_server(s->target);
1678 struct stream_interface *si = &s->si[1];
1679 struct channel *req = &s->req;
1680
1681 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1682
1683 if (si->state == SI_ST_ASS) {
1684 /* Server assigned to connection request, we have to try to connect now */
1685 int conn_err;
1686
1687 /* Before we try to initiate the connection, see if the
1688 * request may be aborted instead.
1689 */
1690 if (back_may_abort_req(req, s)) {
1691 si->err_type |= SI_ET_CONN_ABRT;
1692 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1693 goto abort_connection;
1694 }
1695
1696 conn_err = connect_server(s);
1697 srv = objt_server(s->target);
1698
1699 if (conn_err == SF_ERR_NONE) {
1700 /* state = SI_ST_CON or SI_ST_EST now */
1701 if (srv)
1702 srv_inc_sess_ctr(srv);
1703 if (srv)
1704 srv_set_sess_last(srv);
1705 DBG_TRACE_STATE("connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1706 goto end;
1707 }
1708
1709 /* We have received a synchronous error. We might have to
1710 * abort, retry immediately or redispatch.
1711 */
1712 if (conn_err == SF_ERR_INTERNAL) {
1713 if (!si->err_type) {
1714 si->err_type = SI_ET_CONN_OTHER;
1715 }
1716
1717 if (srv)
1718 srv_inc_sess_ctr(srv);
1719 if (srv)
1720 srv_set_sess_last(srv);
1721 if (srv)
1722 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1723 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1724
1725 /* release other streams waiting for this server */
1726 sess_change_server(s, NULL);
1727 if (may_dequeue_tasks(srv, s->be))
1728 process_srv_queue(srv);
1729
1730 /* Failed and not retryable. */
1731 si_shutr(si);
1732 si_shutw(si);
1733 req->flags |= CF_WRITE_ERROR;
1734
1735 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1736
1737 /* we may need to know the position in the queue for logging */
1738 pendconn_cond_unlink(s->pend_pos);
1739
1740 /* no stream was ever accounted for this server */
1741 si->state = SI_ST_CLO;
1742 if (s->srv_error)
1743 s->srv_error(s, si);
1744 DBG_TRACE_STATE("internal error during connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1745 goto end;
1746 }
1747
1748 /* We are facing a retryable error, but we don't want to run a
1749 * turn-around now, as the problem is likely a source port
1750 * allocation problem, so we want to retry now.
1751 */
1752 si->state = SI_ST_CER;
1753 si->flags &= ~SI_FL_ERR;
1754 back_handle_st_cer(s);
1755
1756 DBG_TRACE_STATE("connection error, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1757 /* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
1758 }
1759 else if (si->state == SI_ST_QUE) {
1760 /* connection request was queued, check for any update */
1761 if (!pendconn_dequeue(s)) {
1762 /* The connection is not in the queue anymore. Either
1763 * we have a server connection slot available and we
1764 * go directly to the assigned state, or we need to
1765 * load-balance first and go to the INI state.
1766 */
1767 si->exp = TICK_ETERNITY;
1768 if (unlikely(!(s->flags & SF_ASSIGNED)))
1769 si->state = SI_ST_REQ;
1770 else {
1771 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1772 si->state = SI_ST_ASS;
1773 }
1774 DBG_TRACE_STATE("dequeue connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1775 goto end;
1776 }
1777
1778 /* Connection request still in queue... */
1779 if (si->flags & SI_FL_EXP) {
1780 /* ... and timeout expired */
1781 si->exp = TICK_ETERNITY;
1782 si->flags &= ~SI_FL_EXP;
1783 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1784
1785 /* we may need to know the position in the queue for logging */
1786 pendconn_cond_unlink(s->pend_pos);
1787
1788 if (srv)
1789 _HA_ATOMIC_ADD(&srv->counters.failed_conns, 1);
1790 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
1791 si_shutr(si);
1792 si_shutw(si);
1793 req->flags |= CF_WRITE_TIMEOUT;
1794 if (!si->err_type)
1795 si->err_type = SI_ET_QUEUE_TO;
1796 si->state = SI_ST_CLO;
1797 if (s->srv_error)
1798 s->srv_error(s, si);
1799 DBG_TRACE_STATE("connection request still queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1800 goto end;
1801 }
1802
1803 /* Connection remains in queue, check if we have to abort it */
1804 if (back_may_abort_req(req, s)) {
1805 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1806
1807 /* we may need to know the position in the queue for logging */
1808 pendconn_cond_unlink(s->pend_pos);
1809
1810 si->err_type |= SI_ET_QUEUE_ABRT;
1811 DBG_TRACE_STATE("abort queued connection request", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1812 goto abort_connection;
1813 }
1814
1815 /* Nothing changed */
1816 }
1817 else if (si->state == SI_ST_TAR) {
1818 /* Connection request might be aborted */
1819 if (back_may_abort_req(req, s)) {
1820 si->err_type |= SI_ET_CONN_ABRT;
1821 DBG_TRACE_STATE("connection aborted", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1822 goto abort_connection;
1823 }
1824
1825 if (!(si->flags & SI_FL_EXP))
1826 return; /* still in turn-around */
1827
1828 si->flags &= ~SI_FL_EXP;
1829 si->exp = TICK_ETERNITY;
1830
1831 /* we keep trying on the same server as long as the stream is
1832 * marked "assigned".
1833 * FIXME: Should we force a redispatch attempt when the server is down ?
1834 */
1835 if (s->flags & SF_ASSIGNED)
1836 si->state = SI_ST_ASS;
1837 else
1838 si->state = SI_ST_REQ;
1839
1840 DBG_TRACE_STATE("retry connection now", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1841 }
1842
1843 end:
1844 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1845 return;
1846
1847abort_connection:
1848 /* give up */
1849 si->exp = TICK_ETERNITY;
1850 si->flags &= ~SI_FL_EXP;
1851 si_shutr(si);
1852 si_shutw(si);
1853 si->state = SI_ST_CLO;
1854 if (s->srv_error)
1855 s->srv_error(s, si);
1856 DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1857 return;
1858}
1859
1860/* This function initiates a server connection request on a stream interface
1861 * already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS for
1862 * a real connection to a server, indicating that a server has been assigned,
1863 * or SI_ST_EST for a successful connection to an applet. It may also return
1864 * SI_ST_QUE, or SI_ST_CLO upon error.
1865 */
1866void back_handle_st_req(struct stream *s)
1867{
1868 struct stream_interface *si = &s->si[1];
1869
1870 if (si->state != SI_ST_REQ)
1871 return;
1872
1873 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1874
1875 if (unlikely(obj_type(s->target) == OBJ_TYPE_APPLET)) {
1876 /* the applet directly goes to the EST state */
1877 struct appctx *appctx = objt_appctx(si->end);
1878
1879 if (!appctx || appctx->applet != __objt_applet(s->target))
1880 appctx = si_register_handler(si, objt_applet(s->target));
1881
1882 if (!appctx) {
1883 /* No more memory, let's immediately abort. Force the
1884 * error code to ignore the ERR_LOCAL which is not a
1885 * real error.
1886 */
1887 s->flags &= ~(SF_ERR_MASK | SF_FINST_MASK);
1888
1889 si_shutr(si);
1890 si_shutw(si);
1891 s->req.flags |= CF_WRITE_ERROR;
1892 si->err_type = SI_ET_CONN_RES;
1893 si->state = SI_ST_CLO;
1894 if (s->srv_error)
1895 s->srv_error(s, si);
1896 DBG_TRACE_STATE("failed to register applet", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1897 goto end;
1898 }
1899
1900 if (tv_iszero(&s->logs.tv_request))
1901 s->logs.tv_request = now;
1902 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1903 si->state = SI_ST_EST;
1904 si->err_type = SI_ET_NONE;
1905 be_set_sess_last(s->be);
1906
1907 DBG_TRACE_STATE("applet registered", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1908 /* let back_establish() finish the job */
1909 goto end;
1910 }
1911
1912 /* Try to assign a server */
1913 if (srv_redispatch_connect(s) != 0) {
1914 /* We did not get a server. Either we queued the
1915 * connection request, or we encountered an error.
1916 */
1917 if (si->state == SI_ST_QUE) {
1918 DBG_TRACE_STATE("connection request queued", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1919 goto end;
1920 }
1921
1922 /* we did not get any server, let's check the cause */
1923 si_shutr(si);
1924 si_shutw(si);
1925 s->req.flags |= CF_WRITE_ERROR;
1926 if (!si->err_type)
1927 si->err_type = SI_ET_CONN_OTHER;
1928 si->state = SI_ST_CLO;
1929 if (s->srv_error)
1930 s->srv_error(s, si);
1931 DBG_TRACE_STATE("connection request failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1932 goto end;
1933 }
1934
1935 /* The server is assigned */
1936 s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
1937 si->state = SI_ST_ASS;
1938 be_set_sess_last(s->be);
1939 DBG_TRACE_STATE("connection request assigned to a server", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1940
1941 end:
1942 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1943}
1944
1945/* This function is called with (si->state == SI_ST_CON) meaning that a
1946 * connection was attempted and that the file descriptor is already allocated.
1947 * We must check for timeout, error and abort. Possible output states are
1948 * SI_ST_CER (error), SI_ST_DIS (abort), and SI_ST_CON (no change). This only
1949 * works with connection-based streams. We know that there were no I/O event
1950 * when reaching this function. Timeouts and errors are *not* cleared.
1951 */
1952void back_handle_st_con(struct stream *s)
1953{
1954 struct stream_interface *si = &s->si[1];
1955 struct channel *req = &s->req;
1956 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001957
1958 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1959
1960 /* the client might want to abort */
1961 if ((rep->flags & CF_SHUTW) ||
1962 ((req->flags & CF_SHUTW_NOW) &&
1963 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
1964 si->flags |= SI_FL_NOLINGER;
1965 si_shutw(si);
1966 si->err_type |= SI_ET_CONN_ABRT;
1967 if (s->srv_error)
1968 s->srv_error(s, si);
1969 /* Note: state = SI_ST_DIS now */
1970 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 +01001971 goto end;
1972 }
1973
Willy Tarreau062df2c2020-01-10 06:17:03 +01001974 done:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001975 /* retryable error ? */
Willy Tarreau062df2c2020-01-10 06:17:03 +01001976 if (si->flags & (SI_FL_EXP|SI_FL_ERR)) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001977 if (!si->err_type) {
1978 if (si->flags & SI_FL_ERR)
1979 si->err_type = SI_ET_CONN_ERR;
1980 else
1981 si->err_type = SI_ET_CONN_TO;
1982 }
1983
1984 si->state = SI_ST_CER;
1985 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
1986 }
1987
Willy Tarreau062df2c2020-01-10 06:17:03 +01001988 end:
Willy Tarreau3a9312a2020-01-09 18:43:15 +01001989 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
1990}
1991
1992/* This function is called with (si->state == SI_ST_CER) meaning that a
1993 * previous connection attempt has failed and that the file descriptor
1994 * has already been released. Possible causes include asynchronous error
1995 * notification and time out. Possible output states are SI_ST_CLO when
1996 * retries are exhausted, SI_ST_TAR when a delay is wanted before a new
1997 * connection attempt, SI_ST_ASS when it's wise to retry on the same server,
1998 * and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
1999 * marked as in error state. Timeouts and errors are cleared before retrying.
2000 */
2001void back_handle_st_cer(struct stream *s)
2002{
2003 struct stream_interface *si = &s->si[1];
2004 struct conn_stream *cs = objt_cs(si->end);
2005 struct connection *conn = cs_conn(cs);
2006
2007 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2008
2009 si->exp = TICK_ETERNITY;
2010 si->flags &= ~SI_FL_EXP;
2011
2012 /* we probably have to release last stream from the server */
2013 if (objt_server(s->target)) {
2014 health_adjust(objt_server(s->target), HANA_STATUS_L4_ERR);
2015
2016 if (s->flags & SF_CURR_SESS) {
2017 s->flags &= ~SF_CURR_SESS;
2018 _HA_ATOMIC_SUB(&__objt_server(s->target)->cur_sess, 1);
2019 }
2020
2021 if ((si->flags & SI_FL_ERR) &&
2022 conn && conn->err_code == CO_ER_SSL_MISMATCH_SNI) {
2023 /* We tried to connect to a server which is configured
2024 * with "verify required" and which doesn't have the
2025 * "verifyhost" directive. The server presented a wrong
2026 * certificate (a certificate for an unexpected name),
2027 * which implies that we have used SNI in the handshake,
2028 * and that the server doesn't have the associated cert
2029 * and presented a default one.
2030 *
2031 * This is a serious enough issue not to retry. It's
2032 * especially important because this wrong name might
2033 * either be the result of a configuration error, and
2034 * retrying will only hammer the server, or is caused
2035 * by the use of a wrong SNI value, most likely
2036 * provided by the client and we don't want to let the
2037 * client provoke retries.
2038 */
2039 si->conn_retries = 0;
2040 DBG_TRACE_DEVEL("Bad SSL cert, disable connection retries", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2041 }
2042 }
2043
2044 /* ensure that we have enough retries left */
2045 si->conn_retries--;
2046 if (si->conn_retries < 0 || !(s->be->retry_type & PR_RE_CONN_FAILED)) {
2047 if (!si->err_type) {
2048 si->err_type = SI_ET_CONN_ERR;
2049 }
2050
2051 if (objt_server(s->target))
2052 _HA_ATOMIC_ADD(&objt_server(s->target)->counters.failed_conns, 1);
2053 _HA_ATOMIC_ADD(&s->be->be_counters.failed_conns, 1);
2054 sess_change_server(s, NULL);
2055 if (may_dequeue_tasks(objt_server(s->target), s->be))
2056 process_srv_queue(objt_server(s->target));
2057
2058 /* shutw is enough so stop a connecting socket */
2059 si_shutw(si);
2060 s->req.flags |= CF_WRITE_ERROR;
2061 s->res.flags |= CF_READ_ERROR;
2062
2063 si->state = SI_ST_CLO;
2064 if (s->srv_error)
2065 s->srv_error(s, si);
2066
2067 DBG_TRACE_STATE("connection failed", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2068 goto end;
2069 }
2070
2071 stream_choose_redispatch(s);
2072
2073 if (si->flags & SI_FL_ERR) {
2074 /* The error was an asynchronous connection error, and we will
2075 * likely have to retry connecting to the same server, most
2076 * likely leading to the same result. To avoid this, we wait
2077 * MIN(one second, connect timeout) before retrying. We don't
2078 * do it when the failure happened on a reused connection
2079 * though.
2080 */
2081
2082 int delay = 1000;
2083
2084 if (s->be->timeout.connect && s->be->timeout.connect < delay)
2085 delay = s->be->timeout.connect;
2086
2087 if (!si->err_type)
2088 si->err_type = SI_ET_CONN_ERR;
2089
2090 /* only wait when we're retrying on the same server */
2091 if ((si->state == SI_ST_ASS ||
2092 (s->be->lbprm.algo & BE_LB_KIND) != BE_LB_KIND_RR ||
2093 (s->be->srv_act <= 1)) && !(s->flags & SF_SRV_REUSED)) {
2094 si->state = SI_ST_TAR;
2095 si->exp = tick_add(now_ms, MS_TO_TICKS(delay));
2096 }
2097 si->flags &= ~SI_FL_ERR;
2098 DBG_TRACE_STATE("retry a new connection", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2099 }
2100
2101 end:
2102 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2103}
2104
2105/* This function is called with (si->state == SI_ST_RDY) meaning that a
2106 * connection was attempted, that the file descriptor is already allocated,
2107 * and that it has succeeded. We must still check for errors and aborts.
2108 * Possible output states are SI_ST_EST (established), SI_ST_CER (error),
2109 * and SI_ST_DIS (abort). This only works with connection-based streams.
2110 * Timeouts and errors are *not* cleared.
2111 */
2112void back_handle_st_rdy(struct stream *s)
2113{
2114 struct stream_interface *si = &s->si[1];
2115 struct channel *req = &s->req;
2116 struct channel *rep = &s->res;
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002117
2118 DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2119 /* We know the connection at least succeeded, though it could have
2120 * since met an error for any other reason. At least it didn't time out
2121 * eventhough the timeout might have been reported right after success.
2122 * We need to take care of various situations here :
2123 * - everything might be OK. We have to switch to established.
2124 * - an I/O error might have been reported after a successful transfer,
2125 * which is not retryable and needs to be logged correctly, and needs
2126 * established as well
2127 * - SI_ST_CON implies !CF_WROTE_DATA but not conversely as we could
2128 * have validated a connection with incoming data (e.g. TCP with a
2129 * banner protocol), or just a successful connect() probe.
2130 * - the client might have requested a connection abort, this needs to
2131 * be checked before we decide to retry anything.
2132 */
2133
2134 /* it's still possible to handle client aborts or connection retries
2135 * before any data were sent.
2136 */
2137 if (!(req->flags & CF_WROTE_DATA)) {
2138 /* client abort ? */
2139 if ((rep->flags & CF_SHUTW) ||
2140 ((req->flags & CF_SHUTW_NOW) &&
2141 (channel_is_empty(req) || (s->be->options & PR_O_ABRT_CLOSE)))) {
2142 /* give up */
2143 si->flags |= SI_FL_NOLINGER;
2144 si_shutw(si);
2145 si->err_type |= SI_ET_CONN_ABRT;
2146 if (s->srv_error)
2147 s->srv_error(s, si);
2148 DBG_TRACE_STATE("client abort during connection attempt", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2149 goto end;
2150 }
2151
2152 /* retryable error ? */
2153 if (si->flags & SI_FL_ERR) {
Willy Tarreau3a9312a2020-01-09 18:43:15 +01002154 if (!si->err_type)
2155 si->err_type = SI_ET_CONN_ERR;
2156 si->state = SI_ST_CER;
2157 DBG_TRACE_STATE("connection failed, retry", STRM_EV_STRM_PROC|STRM_EV_SI_ST|STRM_EV_STRM_ERR, s);
2158 goto end;
2159 }
2160 }
2161
2162 /* data were sent and/or we had no error, back_establish() will
2163 * now take over.
2164 */
2165 DBG_TRACE_STATE("connection established", STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2166 si->err_type = SI_ET_NONE;
2167 si->state = SI_ST_EST;
2168
2169 end:
2170 DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
2171}
2172
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002173/* sends a log message when a backend goes down, and also sets last
2174 * change date.
2175 */
2176void set_backend_down(struct proxy *be)
2177{
2178 be->last_change = now.tv_sec;
Olivier Houchard237f7812019-03-08 18:49:07 +01002179 _HA_ATOMIC_ADD(&be->down_trans, 1);
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002180
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002181 if (!(global.mode & MODE_STARTING)) {
Christopher Faulet767a84b2017-11-24 16:50:31 +01002182 ha_alert("%s '%s' has no server available!\n", proxy_type_str(be), be->id);
Willy Tarreau6fb8dc12016-11-03 19:42:36 +01002183 send_log(be, LOG_EMERG, "%s %s has no server available!\n", proxy_type_str(be), be->id);
2184 }
Willy Tarreau4aac7db2014-05-16 11:48:10 +02002185}
2186
Willy Tarreau87b09662015-04-03 00:22:06 +02002187/* Apply RDP cookie persistence to the current stream. For this, the function
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002188 * tries to extract an RDP cookie from the request buffer, and look for the
2189 * matching server in the list. If the server is found, it is assigned to the
Willy Tarreau87b09662015-04-03 00:22:06 +02002190 * stream. This always returns 1, and the analyser removes itself from the
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002191 * list. Nothing is performed if a server was already assigned.
2192 */
Willy Tarreau87b09662015-04-03 00:22:06 +02002193int tcp_persist_rdp_cookie(struct stream *s, struct channel *req, int an_bit)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002194{
2195 struct proxy *px = s->be;
2196 int ret;
Willy Tarreau37406352012-04-23 16:16:37 +02002197 struct sample smp;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002198 struct server *srv = px->srv;
Willy Tarreau04276f32017-01-06 17:41:29 +01002199 uint16_t port;
2200 uint32_t addr;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002201 char *p;
2202
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002203 DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002204
Willy Tarreaue7dff022015-04-03 01:14:29 +02002205 if (s->flags & SF_ASSIGNED)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002206 goto no_cookie;
2207
Willy Tarreau37406352012-04-23 16:16:37 +02002208 memset(&smp, 0, sizeof(smp));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002209
Willy Tarreaucadd8c92013-07-22 18:09:52 +02002210 ret = fetch_rdp_cookie_name(s, &smp, s->be->rdp_cookie_name, s->be->rdp_cookie_len);
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002211 if (ret == 0 || (smp.flags & SMP_F_MAY_CHANGE) || smp.data.u.str.data == 0)
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002212 goto no_cookie;
2213
Willy Tarreau04276f32017-01-06 17:41:29 +01002214 /* Considering an rdp cookie detected using acl, str ended with <cr><lf> and should return.
2215 * The cookie format is <ip> "." <port> where "ip" is the integer corresponding to the
2216 * server's IP address in network order, and "port" is the integer corresponding to the
2217 * server's port in network order. Comments please Emeric.
2218 */
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002219 addr = strtoul(smp.data.u.str.area, &p, 10);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002220 if (*p != '.')
2221 goto no_cookie;
2222 p++;
Willy Tarreau04276f32017-01-06 17:41:29 +01002223
2224 port = ntohs(strtoul(p, &p, 10));
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002225 if (*p != '.')
2226 goto no_cookie;
2227
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002228 s->target = NULL;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002229 while (srv) {
Willy Tarreau28e9d062014-05-09 22:47:50 +02002230 if (srv->addr.ss_family == AF_INET &&
Willy Tarreau04276f32017-01-06 17:41:29 +01002231 port == srv->svc_port &&
2232 addr == ((struct sockaddr_in *)&srv->addr)->sin_addr.s_addr) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002233 if ((srv->cur_state != SRV_ST_STOPPED) || (px->options & PR_O_PERSIST)) {
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002234 /* we found the server and it is usable */
Willy Tarreaue7dff022015-04-03 01:14:29 +02002235 s->flags |= SF_DIRECT | SF_ASSIGNED;
Willy Tarreau3fdb3662012-11-12 00:42:33 +01002236 s->target = &srv->obj_type;
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002237 break;
2238 }
2239 }
2240 srv = srv->next;
2241 }
2242
2243no_cookie:
2244 req->analysers &= ~an_bit;
2245 req->analyse_exp = TICK_ETERNITY;
Christopher Fauleteea8fc72019-11-05 16:18:10 +01002246 DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
Willy Tarreau44b90cc2010-05-24 20:27:29 +02002247 return 1;
2248}
2249
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002250int be_downtime(struct proxy *px) {
Willy Tarreaub625a082007-11-26 01:15:43 +01002251 if (px->lbprm.tot_weight && px->last_change < now.tv_sec) // ignore negative time
Krzysztof Oledzki85130942007-10-22 16:21:10 +02002252 return px->down_time;
2253
2254 return now.tv_sec - px->last_change + px->down_time;
2255}
Willy Tarreaubaaee002006-06-26 02:48:02 +02002256
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002257/*
2258 * This function returns a string containing the balancing
2259 * mode of the proxy in a format suitable for stats.
2260 */
2261
2262const char *backend_lb_algo_str(int algo) {
2263
2264 if (algo == BE_LB_ALGO_RR)
2265 return "roundrobin";
2266 else if (algo == BE_LB_ALGO_SRR)
2267 return "static-rr";
Willy Tarreauf09c6602012-02-13 17:12:08 +01002268 else if (algo == BE_LB_ALGO_FAS)
2269 return "first";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002270 else if (algo == BE_LB_ALGO_LC)
2271 return "leastconn";
2272 else if (algo == BE_LB_ALGO_SH)
2273 return "source";
2274 else if (algo == BE_LB_ALGO_UH)
2275 return "uri";
2276 else if (algo == BE_LB_ALGO_PH)
2277 return "url_param";
2278 else if (algo == BE_LB_ALGO_HH)
2279 return "hdr";
2280 else if (algo == BE_LB_ALGO_RCH)
2281 return "rdp-cookie";
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002282 else if (algo == BE_LB_ALGO_NONE)
2283 return "none";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002284 else
Willy Tarreaub3e111b2016-11-26 15:52:04 +01002285 return "unknown";
Krzysztof Piotr Oledzki15514c22010-01-04 16:03:09 +01002286}
2287
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002288/* This function parses a "balance" statement in a backend section describing
2289 * <curproxy>. It returns -1 if there is any error, otherwise zero. If it
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002290 * returns -1, it will write an error message into the <err> buffer which will
2291 * automatically be allocated and must be passed as NULL. The trailing '\n'
2292 * will not be written. The function must be called with <args> pointing to the
2293 * first word after "balance".
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002294 */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002295int backend_parse_balance(const char **args, char **err, struct proxy *curproxy)
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002296{
2297 if (!*(args[0])) {
2298 /* if no option is set, use round-robin by default */
Willy Tarreau31682232007-11-29 15:38:04 +01002299 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2300 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002301 return 0;
2302 }
2303
2304 if (!strcmp(args[0], "roundrobin")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002305 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2306 curproxy->lbprm.algo |= BE_LB_ALGO_RR;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002307 }
Willy Tarreau9757a382009-10-03 12:56:50 +02002308 else if (!strcmp(args[0], "static-rr")) {
2309 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2310 curproxy->lbprm.algo |= BE_LB_ALGO_SRR;
2311 }
Willy Tarreauf09c6602012-02-13 17:12:08 +01002312 else if (!strcmp(args[0], "first")) {
2313 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2314 curproxy->lbprm.algo |= BE_LB_ALGO_FAS;
2315 }
Willy Tarreau51406232008-03-10 22:04:20 +01002316 else if (!strcmp(args[0], "leastconn")) {
2317 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2318 curproxy->lbprm.algo |= BE_LB_ALGO_LC;
2319 }
Willy Tarreau21c741a2019-01-14 18:14:27 +01002320 else if (!strncmp(args[0], "random", 6)) {
Willy Tarreau760e81d2018-05-03 07:20:40 +02002321 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2322 curproxy->lbprm.algo |= BE_LB_ALGO_RND;
Willy Tarreau21c741a2019-01-14 18:14:27 +01002323 curproxy->lbprm.arg_opt1 = 2;
2324
2325 if (*(args[0] + 6) == '(' && *(args[0] + 7) != ')') { /* number of draws */
2326 const char *beg;
2327 char *end;
2328
2329 beg = args[0] + 7;
2330 curproxy->lbprm.arg_opt1 = strtol(beg, &end, 0);
2331
2332 if (*end != ')') {
2333 if (!*end)
2334 memprintf(err, "random : missing closing parenthesis.");
2335 else
2336 memprintf(err, "random : unexpected character '%c' after argument.", *end);
2337 return -1;
2338 }
2339
2340 if (curproxy->lbprm.arg_opt1 < 1) {
2341 memprintf(err, "random : number of draws must be at least 1.");
2342 return -1;
2343 }
2344 }
Willy Tarreau760e81d2018-05-03 07:20:40 +02002345 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002346 else if (!strcmp(args[0], "source")) {
Willy Tarreau31682232007-11-29 15:38:04 +01002347 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2348 curproxy->lbprm.algo |= BE_LB_ALGO_SH;
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002349 }
2350 else if (!strcmp(args[0], "uri")) {
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002351 int arg = 1;
2352
Willy Tarreau31682232007-11-29 15:38:04 +01002353 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2354 curproxy->lbprm.algo |= BE_LB_ALGO_UH;
Willy Tarreaua9a72492019-01-14 16:14:15 +01002355 curproxy->lbprm.arg_opt1 = 0; // "whole"
2356 curproxy->lbprm.arg_opt2 = 0; // "len"
2357 curproxy->lbprm.arg_opt3 = 0; // "depth"
Oskar Stolc8dc41842012-05-19 10:19:54 +01002358
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002359 while (*args[arg]) {
2360 if (!strcmp(args[arg], "len")) {
2361 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002362 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002363 return -1;
2364 }
Willy Tarreaua9a72492019-01-14 16:14:15 +01002365 curproxy->lbprm.arg_opt2 = atoi(args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002366 arg += 2;
2367 }
2368 else if (!strcmp(args[arg], "depth")) {
2369 if (!*args[arg+1] || (atoi(args[arg+1]) <= 0)) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002370 memprintf(err, "%s : '%s' expects a positive integer (got '%s').", args[0], args[arg], args[arg+1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002371 return -1;
2372 }
2373 /* hint: we store the position of the ending '/' (depth+1) so
2374 * that we avoid a comparison while computing the hash.
2375 */
Willy Tarreaua9a72492019-01-14 16:14:15 +01002376 curproxy->lbprm.arg_opt3 = atoi(args[arg+1]) + 1;
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002377 arg += 2;
2378 }
Oskar Stolc8dc41842012-05-19 10:19:54 +01002379 else if (!strcmp(args[arg], "whole")) {
Willy Tarreaua9a72492019-01-14 16:14:15 +01002380 curproxy->lbprm.arg_opt1 = 1;
Oskar Stolc8dc41842012-05-19 10:19:54 +01002381 arg += 1;
2382 }
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002383 else {
Oskar Stolc8dc41842012-05-19 10:19:54 +01002384 memprintf(err, "%s only accepts parameters 'len', 'depth', and 'whole' (got '%s').", args[0], args[arg]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002385 return -1;
2386 }
2387 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002388 }
Willy Tarreau01732802007-11-01 22:48:15 +01002389 else if (!strcmp(args[0], "url_param")) {
2390 if (!*args[1]) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002391 memprintf(err, "%s requires an URL parameter name.", args[0]);
Willy Tarreau01732802007-11-01 22:48:15 +01002392 return -1;
2393 }
Willy Tarreau31682232007-11-29 15:38:04 +01002394 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2395 curproxy->lbprm.algo |= BE_LB_ALGO_PH;
Willy Tarreaua534fea2008-08-03 12:19:50 +02002396
Willy Tarreau4c03d1c2019-01-14 15:23:54 +01002397 free(curproxy->lbprm.arg_str);
2398 curproxy->lbprm.arg_str = strdup(args[1]);
2399 curproxy->lbprm.arg_len = strlen(args[1]);
Marek Majkowski9c30fc12008-04-27 23:25:55 +02002400 if (*args[2]) {
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002401 if (strcmp(args[2], "check_post")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002402 memprintf(err, "%s only accepts 'check_post' modifier (got '%s').", args[0], args[2]);
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002403 return -1;
2404 }
matt.farnsworth@nokia.com1c2ab962008-04-14 20:47:37 +02002405 }
Benoitaffb4812009-03-25 13:02:10 +01002406 }
2407 else if (!strncmp(args[0], "hdr(", 4)) {
2408 const char *beg, *end;
2409
2410 beg = args[0] + 4;
2411 end = strchr(beg, ')');
2412
2413 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002414 memprintf(err, "hdr requires an http header field name.");
Benoitaffb4812009-03-25 13:02:10 +01002415 return -1;
2416 }
2417
2418 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2419 curproxy->lbprm.algo |= BE_LB_ALGO_HH;
2420
Willy Tarreau484ff072019-01-14 15:28:53 +01002421 free(curproxy->lbprm.arg_str);
2422 curproxy->lbprm.arg_len = end - beg;
2423 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
Willy Tarreau9fed8582019-01-14 16:04:54 +01002424 curproxy->lbprm.arg_opt1 = 0;
Benoitaffb4812009-03-25 13:02:10 +01002425
2426 if (*args[1]) {
2427 if (strcmp(args[1], "use_domain_only")) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002428 memprintf(err, "%s only accepts 'use_domain_only' modifier (got '%s').", args[0], args[1]);
Benoitaffb4812009-03-25 13:02:10 +01002429 return -1;
2430 }
Willy Tarreau9fed8582019-01-14 16:04:54 +01002431 curproxy->lbprm.arg_opt1 = 1;
Benoitaffb4812009-03-25 13:02:10 +01002432 }
Emeric Brun736aa232009-06-30 17:56:00 +02002433 }
2434 else if (!strncmp(args[0], "rdp-cookie", 10)) {
2435 curproxy->lbprm.algo &= ~BE_LB_ALGO;
2436 curproxy->lbprm.algo |= BE_LB_ALGO_RCH;
2437
2438 if ( *(args[0] + 10 ) == '(' ) { /* cookie name */
2439 const char *beg, *end;
2440
2441 beg = args[0] + 11;
2442 end = strchr(beg, ')');
2443
2444 if (!end || end == beg) {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002445 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002446 return -1;
2447 }
2448
Willy Tarreau484ff072019-01-14 15:28:53 +01002449 free(curproxy->lbprm.arg_str);
2450 curproxy->lbprm.arg_str = my_strndup(beg, end - beg);
2451 curproxy->lbprm.arg_len = end - beg;
Emeric Brun736aa232009-06-30 17:56:00 +02002452 }
2453 else if ( *(args[0] + 10 ) == '\0' ) { /* default cookie name 'mstshash' */
Willy Tarreau484ff072019-01-14 15:28:53 +01002454 free(curproxy->lbprm.arg_str);
2455 curproxy->lbprm.arg_str = strdup("mstshash");
2456 curproxy->lbprm.arg_len = strlen(curproxy->lbprm.arg_str);
Emeric Brun736aa232009-06-30 17:56:00 +02002457 }
2458 else { /* syntax */
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002459 memprintf(err, "rdp-cookie : missing cookie name.");
Emeric Brun736aa232009-06-30 17:56:00 +02002460 return -1;
2461 }
Willy Tarreau01732802007-11-01 22:48:15 +01002462 }
Willy Tarreaua0cbda62007-11-01 21:39:54 +01002463 else {
Willy Tarreaua93c74b2012-05-08 18:14:39 +02002464 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 +01002465 return -1;
2466 }
2467 return 0;
2468}
2469
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002470
2471/************************************************************************/
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002472/* All supported sample and ACL keywords must be declared here. */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002473/************************************************************************/
2474
Willy Tarreau34db1082012-04-19 17:16:54 +02002475/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002476 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002477 * undefined behaviour.
2478 */
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002479static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002480smp_fetch_nbsrv(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002481{
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002482 struct proxy *px;
2483
Willy Tarreau37406352012-04-23 16:16:37 +02002484 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002485 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002486 px = args->data.prx;
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002487
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002488 smp->data.u.sint = be_usable_srv(px);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002489
2490 return 1;
2491}
2492
Willy Tarreau37406352012-04-23 16:16:37 +02002493/* report in smp->flags a success or failure depending on the designated
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002494 * server's state. There is no match function involved since there's no pattern.
Willy Tarreau34db1082012-04-19 17:16:54 +02002495 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2496 * undefined behaviour.
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002497 */
2498static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002499smp_fetch_srv_is_up(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002500{
Willy Tarreau24e32d82012-04-23 23:55:44 +02002501 struct server *srv = args->data.srv;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002502
Willy Tarreau37406352012-04-23 16:16:37 +02002503 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002504 smp->data.type = SMP_T_BOOL;
Emeric Brun52a91d32017-08-31 14:41:55 +02002505 if (!(srv->cur_admin & SRV_ADMF_MAINT) &&
2506 (!(srv->check.state & CHK_ST_CONFIGURED) || (srv->cur_state != SRV_ST_STOPPED)))
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002507 smp->data.u.sint = 1;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002508 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002509 smp->data.u.sint = 0;
Willy Tarreau0b1cd942010-05-16 22:18:27 +02002510 return 1;
2511}
2512
Willy Tarreau34db1082012-04-19 17:16:54 +02002513/* set temp integer to the number of enabled servers on the proxy.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002514 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002515 * undefined behaviour.
2516 */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002517static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002518smp_fetch_connslots(const struct arg *args, struct sample *smp, const char *kw, void *private)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002519{
2520 struct server *iterator;
Willy Tarreaud28c3532012-04-19 19:28:33 +02002521
Willy Tarreau37406352012-04-23 16:16:37 +02002522 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002523 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002524 smp->data.u.sint = 0;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002525
Willy Tarreau24e32d82012-04-23 23:55:44 +02002526 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
Emeric Brun52a91d32017-08-31 14:41:55 +02002527 if (iterator->cur_state == SRV_ST_STOPPED)
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002528 continue;
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002529
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002530 if (iterator->maxconn == 0 || iterator->maxqueue == 0) {
Willy Tarreaua5e37562011-12-16 17:06:15 +01002531 /* configuration is stupid */
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002532 smp->data.u.sint = -1; /* FIXME: stupid value! */
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002533 return 1;
2534 }
2535
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002536 smp->data.u.sint += (iterator->maxconn - iterator->cur_sess)
Willy Tarreau422aa072012-04-20 20:49:27 +02002537 + (iterator->maxqueue - iterator->nbpend);
Jeffrey 'jf' Lim5051d7b2008-09-04 01:03:03 +08002538 }
2539
2540 return 1;
2541}
2542
Willy Tarreaua5e37562011-12-16 17:06:15 +01002543/* set temp integer to the id of the backend */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002544static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002545smp_fetch_be_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002546{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002547 struct proxy *px = NULL;
2548
2549 if (smp->strm)
2550 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002551 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002552 px = __objt_check(smp->sess->origin)->proxy;
2553 if (!px)
Willy Tarreaube508f12016-03-10 11:47:01 +01002554 return 0;
2555
Willy Tarreauf853c462012-04-23 18:53:56 +02002556 smp->flags = SMP_F_VOL_TXN;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002557 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002558 smp->data.u.sint = px->uuid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002559 return 1;
2560}
2561
Marcin Deranekd2471c22016-12-12 14:08:05 +01002562/* set string to the name of the backend */
2563static int
2564smp_fetch_be_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2565{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002566 struct proxy *px = NULL;
2567
2568 if (smp->strm)
2569 px = smp->strm->be;
Christopher Fauletf98e6262020-05-06 09:42:04 +02002570 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002571 px = __objt_check(smp->sess->origin)->proxy;
2572 if (!px)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002573 return 0;
2574
Christopher Fauletd1b44642020-04-30 09:51:15 +02002575 smp->data.u.str.area = (char *)px->id;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002576 if (!smp->data.u.str.area)
Marcin Deranekd2471c22016-12-12 14:08:05 +01002577 return 0;
2578
2579 smp->data.type = SMP_T_STR;
2580 smp->flags = SMP_F_CONST;
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002581 smp->data.u.str.data = strlen(smp->data.u.str.area);
Marcin Deranekd2471c22016-12-12 14:08:05 +01002582
2583 return 1;
2584}
2585
Willy Tarreaua5e37562011-12-16 17:06:15 +01002586/* set temp integer to the id of the server */
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002587static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002588smp_fetch_srv_id(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau37406352012-04-23 16:16:37 +02002589{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002590 struct server *srv = NULL;
Willy Tarreaube508f12016-03-10 11:47:01 +01002591
Christopher Fauletd1b44642020-04-30 09:51:15 +02002592 if (smp->strm)
2593 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002594 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002595 srv = __objt_check(smp->sess->origin)->server;
2596 if (!srv)
Willy Tarreau17af4192011-02-23 14:27:06 +01002597 return 0;
2598
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002599 smp->data.type = SMP_T_SINT;
Christopher Fauletd1b44642020-04-30 09:51:15 +02002600 smp->data.u.sint = srv->puid;
Hervé COMMOWICK35ed8012010-12-15 14:04:51 +01002601
2602 return 1;
2603}
2604
vkill1dfd1652019-10-30 16:58:14 +08002605/* set string to the name of the server */
2606static int
2607smp_fetch_srv_name(const struct arg *args, struct sample *smp, const char *kw, void *private)
2608{
Christopher Fauletd1b44642020-04-30 09:51:15 +02002609 struct server *srv = NULL;
vkill1dfd1652019-10-30 16:58:14 +08002610
Christopher Fauletd1b44642020-04-30 09:51:15 +02002611 if (smp->strm)
2612 srv = objt_server(smp->strm->target);
Christopher Fauletf98e6262020-05-06 09:42:04 +02002613 else if (obj_type(smp->sess->origin) == OBJ_TYPE_CHECK)
Christopher Fauletd1b44642020-04-30 09:51:15 +02002614 srv = __objt_check(smp->sess->origin)->server;
2615 if (!srv)
vkill1dfd1652019-10-30 16:58:14 +08002616 return 0;
2617
Christopher Fauletd1b44642020-04-30 09:51:15 +02002618 smp->data.u.str.area = srv->id;
vkill1dfd1652019-10-30 16:58:14 +08002619 if (!smp->data.u.str.area)
2620 return 0;
2621
2622 smp->data.type = SMP_T_STR;
2623 smp->data.u.str.data = strlen(smp->data.u.str.area);
2624
2625 return 1;
2626}
2627
Willy Tarreau34db1082012-04-19 17:16:54 +02002628/* set temp integer to the number of connections per second reaching the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002629 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002630 * undefined behaviour.
2631 */
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002632static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002633smp_fetch_be_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002634{
Willy Tarreau37406352012-04-23 16:16:37 +02002635 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002636 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002637 smp->data.u.sint = read_freq_ctr(&args->data.prx->be_sess_per_sec);
Willy Tarreau079ff0a2009-03-05 21:34:28 +01002638 return 1;
2639}
2640
Willy Tarreau34db1082012-04-19 17:16:54 +02002641/* set temp integer to the number of concurrent connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002642 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002643 * undefined behaviour.
2644 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002645static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002646smp_fetch_be_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002647{
Willy Tarreau37406352012-04-23 16:16:37 +02002648 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002649 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002650 smp->data.u.sint = args->data.prx->beconn;
Willy Tarreaua36af912009-10-10 12:02:45 +02002651 return 1;
2652}
2653
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002654/* set temp integer to the number of available connections across available
2655 * servers on the backend.
2656 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
2657 * undefined behaviour.
2658 */
2659static int
2660smp_fetch_be_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2661{
2662 struct server *iterator;
2663 struct proxy *px;
2664 unsigned int maxconn;
2665
2666 smp->flags = SMP_F_VOL_TEST;
2667 smp->data.type = SMP_T_SINT;
2668 smp->data.u.sint = 0;
2669
2670 for (iterator = args->data.prx->srv; iterator; iterator = iterator->next) {
2671 if (iterator->cur_state == SRV_ST_STOPPED)
2672 continue;
2673
2674 px = iterator->proxy;
2675 if (!srv_currently_usable(iterator) ||
2676 ((iterator->flags & SRV_F_BACKUP) &&
2677 (px->srv_act || (iterator != px->lbprm.fbck && !(px->options & PR_O_USE_ALL_BK)))))
2678 continue;
2679
2680 if (iterator->maxconn == 0) {
2681 /* one active server is unlimited, return -1 */
2682 smp->data.u.sint = -1;
2683 return 1;
2684 }
2685
2686 maxconn = srv_dynamic_maxconn(iterator);
2687 if (maxconn > iterator->cur_sess)
2688 smp->data.u.sint += maxconn - iterator->cur_sess;
2689 }
2690
2691 return 1;
2692}
2693
Willy Tarreau34db1082012-04-19 17:16:54 +02002694/* set temp integer to the total number of queued connections on the backend.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002695 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002696 * undefined behaviour.
2697 */
Willy Tarreaua36af912009-10-10 12:02:45 +02002698static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002699smp_fetch_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002700{
Willy Tarreau37406352012-04-23 16:16:37 +02002701 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002702 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002703 smp->data.u.sint = args->data.prx->totpend;
Willy Tarreaua36af912009-10-10 12:02:45 +02002704 return 1;
2705}
2706
Willy Tarreaua5e37562011-12-16 17:06:15 +01002707/* set temp integer to the total number of queued connections on the backend divided
Willy Tarreaua36af912009-10-10 12:02:45 +02002708 * by the number of running servers and rounded up. If there is no running
2709 * server, we return twice the total, just as if we had half a running server.
2710 * This is more or less correct anyway, since we expect the last server to come
2711 * back soon.
Willy Tarreau0146c2e2012-04-20 11:37:56 +02002712 * Accepts exactly 1 argument. Argument is a backend, other types will lead to
Willy Tarreau34db1082012-04-19 17:16:54 +02002713 * undefined behaviour.
Willy Tarreaua36af912009-10-10 12:02:45 +02002714 */
2715static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002716smp_fetch_avg_queue_size(const struct arg *args, struct sample *smp, const char *kw, void *private)
Willy Tarreaua36af912009-10-10 12:02:45 +02002717{
2718 int nbsrv;
Thierry FOURNIER0a9a2b82015-05-11 15:20:49 +02002719 struct proxy *px;
Willy Tarreaua36af912009-10-10 12:02:45 +02002720
Willy Tarreau37406352012-04-23 16:16:37 +02002721 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002722 smp->data.type = SMP_T_SINT;
Willy Tarreau24e32d82012-04-23 23:55:44 +02002723 px = args->data.prx;
Willy Tarreaua36af912009-10-10 12:02:45 +02002724
Nenad Merdanovic2754fbc2017-03-12 21:56:56 +01002725 nbsrv = be_usable_srv(px);
Willy Tarreaua36af912009-10-10 12:02:45 +02002726
2727 if (nbsrv > 0)
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002728 smp->data.u.sint = (px->totpend + nbsrv - 1) / nbsrv;
Willy Tarreaua36af912009-10-10 12:02:45 +02002729 else
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002730 smp->data.u.sint = px->totpend * 2;
Willy Tarreaua36af912009-10-10 12:02:45 +02002731
2732 return 1;
2733}
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002734
Willy Tarreau34db1082012-04-19 17:16:54 +02002735/* set temp integer to the number of concurrent connections on the server in the backend.
2736 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2737 * undefined behaviour.
2738 */
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002739static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002740smp_fetch_srv_conn(const struct arg *args, struct sample *smp, const char *kw, void *private)
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002741{
Willy Tarreauf853c462012-04-23 18:53:56 +02002742 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002743 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002744 smp->data.u.sint = args->data.srv->cur_sess;
Hervé COMMOWICKdaa824e2011-08-05 12:09:44 +02002745 return 1;
2746}
2747
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002748/* set temp integer to the number of available connections on the server in the backend.
2749 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2750 * undefined behaviour.
2751 */
2752static int
2753smp_fetch_srv_conn_free(const struct arg *args, struct sample *smp, const char *kw, void *private)
2754{
2755 unsigned int maxconn;
2756
2757 smp->flags = SMP_F_VOL_TEST;
2758 smp->data.type = SMP_T_SINT;
2759
2760 if (args->data.srv->maxconn == 0) {
2761 /* one active server is unlimited, return -1 */
2762 smp->data.u.sint = -1;
2763 return 1;
2764 }
2765
2766 maxconn = srv_dynamic_maxconn(args->data.srv);
2767 if (maxconn > args->data.srv->cur_sess)
2768 smp->data.u.sint = maxconn - args->data.srv->cur_sess;
2769 else
2770 smp->data.u.sint = 0;
2771
2772 return 1;
2773}
2774
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002775/* set temp integer to the number of connections pending in the server's queue.
2776 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2777 * undefined behaviour.
2778 */
2779static int
2780smp_fetch_srv_queue(const struct arg *args, struct sample *smp, const char *kw, void *private)
2781{
2782 smp->flags = SMP_F_VOL_TEST;
2783 smp->data.type = SMP_T_SINT;
2784 smp->data.u.sint = args->data.srv->nbpend;
2785 return 1;
2786}
2787
Tait Clarridge7896d522012-12-05 21:39:31 -05002788/* set temp integer to the number of enabled servers on the proxy.
2789 * Accepts exactly 1 argument. Argument is a server, other types will lead to
2790 * undefined behaviour.
2791 */
2792static int
Thierry FOURNIER0786d052015-05-11 15:42:45 +02002793smp_fetch_srv_sess_rate(const struct arg *args, struct sample *smp, const char *kw, void *private)
Tait Clarridge7896d522012-12-05 21:39:31 -05002794{
2795 smp->flags = SMP_F_VOL_TEST;
Thierry FOURNIER8c542ca2015-08-19 09:00:18 +02002796 smp->data.type = SMP_T_SINT;
Thierry FOURNIER136f9d32015-08-19 09:07:19 +02002797 smp->data.u.sint = read_freq_ctr(&args->data.srv->sess_per_sec);
Tait Clarridge7896d522012-12-05 21:39:31 -05002798 return 1;
2799}
2800
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002801static int sample_conv_nbsrv(const struct arg *args, struct sample *smp, void *private)
2802{
2803
2804 struct proxy *px;
2805
2806 if (!smp_make_safe(smp))
2807 return 0;
2808
Willy Tarreau843b7cb2018-07-13 10:54:26 +02002809 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002810 if (!px)
2811 return 0;
2812
2813 smp->data.type = SMP_T_SINT;
2814 smp->data.u.sint = be_usable_srv(px);
2815
2816 return 1;
2817}
2818
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002819static int
2820sample_conv_srv_queue(const struct arg *args, struct sample *smp, void *private)
2821{
2822 struct proxy *px;
2823 struct server *srv;
2824 char *bksep;
2825
2826 if (!smp_make_safe(smp))
2827 return 0;
2828
2829 bksep = strchr(smp->data.u.str.area, '/');
2830
2831 if (bksep) {
2832 *bksep = '\0';
2833 px = proxy_find_by_name(smp->data.u.str.area, PR_CAP_BE, 0);
2834 if (!px)
2835 return 0;
2836 smp->data.u.str.area = bksep + 1;
2837 } else {
2838 if (!(smp->px->cap & PR_CAP_BE))
2839 return 0;
2840 px = smp->px;
2841 }
2842
2843 srv = server_find_by_name(px, smp->data.u.str.area);
2844 if (!srv)
2845 return 0;
2846
2847 smp->data.type = SMP_T_SINT;
2848 smp->data.u.sint = srv->nbpend;
2849 return 1;
2850}
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002851
2852/* Note: must not be declared <const> as its list will be overwritten.
2853 * Please take care of keeping this list alphabetically sorted.
2854 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002855static struct sample_fetch_kw_list smp_kws = {ILH, {
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002856 { "avg_queue", smp_fetch_avg_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2857 { "be_conn", smp_fetch_be_conn, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer4cdf3ab2018-06-14 17:10:27 -04002858 { "be_conn_free", smp_fetch_be_conn_free, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002859 { "be_id", smp_fetch_be_id, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
Marcin Deranekd2471c22016-12-12 14:08:05 +01002860 { "be_name", smp_fetch_be_name, 0, NULL, SMP_T_STR, SMP_USE_BKEND, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002861 { "be_sess_rate", smp_fetch_be_sess_rate, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2862 { "connslots", smp_fetch_connslots, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2863 { "nbsrv", smp_fetch_nbsrv, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2864 { "queue", smp_fetch_queue_size, ARG1(1,BE), NULL, SMP_T_SINT, SMP_USE_INTRN, },
2865 { "srv_conn", smp_fetch_srv_conn, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Patrick Hemmer155e93e2018-06-14 18:01:35 -04002866 { "srv_conn_free", smp_fetch_srv_conn_free, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002867 { "srv_id", smp_fetch_srv_id, 0, NULL, SMP_T_SINT, SMP_USE_SERVR, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002868 { "srv_is_up", smp_fetch_srv_is_up, ARG1(1,SRV), NULL, SMP_T_BOOL, SMP_USE_INTRN, },
vkill1dfd1652019-10-30 16:58:14 +08002869 { "srv_name", smp_fetch_srv_name, 0, NULL, SMP_T_STR, SMP_USE_SERVR, },
Willy Tarreauff2b7af2017-10-13 11:46:26 +02002870 { "srv_queue", smp_fetch_srv_queue, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Thierry FOURNIER07ee64e2015-07-06 23:43:03 +02002871 { "srv_sess_rate", smp_fetch_srv_sess_rate, ARG1(1,SRV), NULL, SMP_T_SINT, SMP_USE_INTRN, },
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002872 { /* END */ },
2873}};
2874
Willy Tarreau0108d902018-11-25 19:14:37 +01002875INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);
2876
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002877/* Note: must not be declared <const> as its list will be overwritten */
2878static struct sample_conv_kw_list sample_conv_kws = {ILH, {
Nenad Merdanovic177adc92019-08-27 01:58:13 +02002879 { "nbsrv", sample_conv_nbsrv, 0, NULL, SMP_T_STR, SMP_T_SINT },
2880 { "srv_queue", sample_conv_srv_queue, 0, NULL, SMP_T_STR, SMP_T_SINT },
Nenad Merdanovicb7e7c472017-03-12 21:56:55 +01002881 { /* END */ },
2882}};
2883
Willy Tarreau0108d902018-11-25 19:14:37 +01002884INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002885
Willy Tarreau61612d42012-04-19 18:42:05 +02002886/* Note: must not be declared <const> as its list will be overwritten.
2887 * Please take care of keeping this list alphabetically sorted.
2888 */
Willy Tarreaudc13c112013-06-21 23:16:39 +02002889static struct acl_kw_list acl_kws = {ILH, {
Willy Tarreau1a7eca12013-01-07 22:38:03 +01002890 { /* END */ },
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002891}};
2892
Willy Tarreau0108d902018-11-25 19:14:37 +01002893INITCALL1(STG_REGISTER, acl_register_keywords, &acl_kws);
Willy Tarreaua9d3c1e2007-11-30 20:48:53 +01002894
Willy Tarreaubaaee002006-06-26 02:48:02 +02002895/*
2896 * Local variables:
2897 * c-indent-level: 8
2898 * c-basic-offset: 8
2899 * End:
2900 */