245 lines
7.2 KiB
C
245 lines
7.2 KiB
C
/*
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* include/proto/session.h
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* This file defines everything related to sessions.
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*
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* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, version 2.1
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* exclusively.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _PROTO_SESSION_H
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#define _PROTO_SESSION_H
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#include <common/config.h>
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#include <common/memory.h>
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#include <types/session.h>
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#include <proto/freq_ctr.h>
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#include <proto/stick_table.h>
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extern struct pool_head *pool2_session;
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extern struct list sessions;
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extern struct data_cb sess_conn_cb;
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int session_accept(struct listener *l, int cfd, struct sockaddr_storage *addr);
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/* perform minimal intializations, report 0 in case of error, 1 if OK. */
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int init_session();
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/* kill a session and set the termination flags to <why> (one of SN_ERR_*) */
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void session_shutdown(struct session *session, int why);
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void session_process_counters(struct session *s);
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void sess_change_server(struct session *sess, struct server *newsrv);
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struct task *process_session(struct task *t);
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void default_srv_error(struct session *s, struct stream_interface *si);
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int parse_track_counters(char **args, int *arg,
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int section_type, struct proxy *curpx,
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struct track_ctr_prm *prm,
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struct proxy *defpx, char **err);
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/* Remove the refcount from the session to the tracked counters, and clear the
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* pointer to ensure this is only performed once. The caller is responsible for
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* ensuring that the pointer is valid first.
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*/
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static inline void session_store_counters(struct session *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!s->stkctr[i].entry)
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)--;
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s->stkctr[i].entry->ref_cnt--;
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stksess_kill_if_expired(s->stkctr[i].table, s->stkctr[i].entry);
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s->stkctr[i].entry = NULL;
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}
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}
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/* Remove the refcount from the session counters tracked only by the backend if
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* any, and clear the pointer to ensure this is only performed once. The caller
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* is responsible for ensuring that the pointer is valid first.
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*/
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static inline void session_stop_backend_counters(struct session *s)
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{
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void *ptr;
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int i;
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if (likely(!(s->flags & SN_BE_TRACK_ANY)))
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return;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!s->stkctr[i].entry)
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continue;
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if (!(s->flags & (SN_BE_TRACK_SC0 << i)))
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)--;
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s->stkctr[i].entry->ref_cnt--;
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stksess_kill_if_expired(s->stkctr[i].table, s->stkctr[i].entry);
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s->stkctr[i].entry = NULL;
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}
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s->flags &= ~SN_BE_TRACK_ANY;
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}
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/* Increase total and concurrent connection count for stick entry <ts> of table
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* <t>. The caller is responsible for ensuring that <t> and <ts> are valid
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* pointers, and for calling this only once per connection.
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*/
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static inline void session_start_counters(struct stktable *t, struct stksess *ts)
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{
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void *ptr;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CUR);
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if (ptr)
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stktable_data_cast(ptr, conn_cur)++;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CNT);
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if (ptr)
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stktable_data_cast(ptr, conn_cnt)++;
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ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, conn_rate),
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t->data_arg[STKTABLE_DT_CONN_RATE].u, 1);
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if (tick_isset(t->expire))
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ts->expire = tick_add(now_ms, MS_TO_TICKS(t->expire));
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}
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/* Enable tracking of session counters as <stkctr> on stksess <ts>. The caller is
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* responsible for ensuring that <t> and <ts> are valid pointers. Some controls
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* are performed to ensure the state can still change.
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*/
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static inline void session_track_stkctr(struct stkctr *ctr, struct stktable *t, struct stksess *ts)
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{
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if (ctr->entry)
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return;
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ts->ref_cnt++;
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ctr->table = t;
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ctr->entry = ts;
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session_start_counters(t, ts);
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}
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/* Increase the number of cumulated HTTP requests in the tracked counters */
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static void inline session_inc_http_req_ctr(struct session *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!s->stkctr[i].entry)
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_REQ_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_req_cnt)++;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_REQ_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
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s->stkctr[i].table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
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}
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}
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/* Increase the number of cumulated HTTP requests in the backend's tracked counters */
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static void inline session_inc_be_http_req_ctr(struct session *s)
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{
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void *ptr;
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int i;
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if (likely(!(s->flags & SN_BE_TRACK_ANY)))
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return;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!s->stkctr[i].entry)
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continue;
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if (!(s->flags & (SN_BE_TRACK_SC0 << i)))
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_REQ_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_req_cnt)++;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_REQ_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
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s->stkctr[i].table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
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}
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}
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/* Increase the number of cumulated failed HTTP requests in the tracked
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* counters. Only 4xx requests should be counted here so that we can
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* distinguish between errors caused by client behaviour and other ones.
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* Note that even 404 are interesting because they're generally caused by
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* vulnerability scans.
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*/
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static void inline session_inc_http_err_ctr(struct session *s)
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{
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void *ptr;
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int i;
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for (i = 0; i < MAX_SESS_STKCTR; i++) {
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if (!s->stkctr[i].entry)
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continue;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_ERR_CNT);
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if (ptr)
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stktable_data_cast(ptr, http_err_cnt)++;
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ptr = stktable_data_ptr(s->stkctr[i].table, s->stkctr[i].entry, STKTABLE_DT_HTTP_ERR_RATE);
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if (ptr)
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update_freq_ctr_period(&stktable_data_cast(ptr, http_err_rate),
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s->stkctr[i].table->data_arg[STKTABLE_DT_HTTP_ERR_RATE].u, 1);
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}
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}
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static void inline session_add_srv_conn(struct session *sess, struct server *srv)
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{
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sess->srv_conn = srv;
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LIST_ADD(&srv->actconns, &sess->by_srv);
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}
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static void inline session_del_srv_conn(struct session *sess)
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{
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if (!sess->srv_conn)
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return;
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sess->srv_conn = NULL;
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LIST_DEL(&sess->by_srv);
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}
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static void inline session_init_srv_conn(struct session *sess)
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{
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sess->srv_conn = NULL;
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LIST_INIT(&sess->by_srv);
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}
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#endif /* _PROTO_SESSION_H */
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/*
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* Local variables:
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* c-indent-level: 8
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* c-basic-offset: 8
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* End:
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*/
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