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haproxy/include/proto/session.h

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/*
* include/proto/session.h
* This file defines everything related to sessions.
*
* Copyright (C) 2000-2010 Willy Tarreau - w@1wt.eu
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _PROTO_SESSION_H
#define _PROTO_SESSION_H
#include <common/config.h>
#include <common/memory.h>
#include <types/session.h>
#include <proto/freq_ctr.h>
#include <proto/stick_table.h>
extern struct pool_head *pool2_session;
extern struct list sessions;
extern struct data_cb sess_conn_cb;
int session_accept(struct listener *l, int cfd, struct sockaddr_storage *addr);
/* perform minimal intializations, report 0 in case of error, 1 if OK. */
int init_session();
/* kill a session and set the termination flags to <why> (one of SN_ERR_*) */
void session_shutdown(struct session *session, int why);
void session_process_counters(struct session *s);
void sess_change_server(struct session *sess, struct server *newsrv);
struct task *process_session(struct task *t);
void default_srv_error(struct session *s, struct stream_interface *si);
int parse_track_counters(char **args, int *arg,
int section_type, struct proxy *curpx,
struct track_ctr_prm *prm,
struct proxy *defpx, char **err);
/* Remove the refcount from the session to the tracked counters, and clear the
* pointer to ensure this is only performed once. The caller is responsible for
* ensuring that the pointer is valid first.
*/
static inline void session_store_counters(struct session *s)
{
void *ptr;
if (s->stkctr2_entry) {
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)--;
s->stkctr2_entry->ref_cnt--;
stksess_kill_if_expired(s->stkctr2_table, s->stkctr2_entry);
s->stkctr2_entry = NULL;
}
if (s->stkctr1_entry) {
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)--;
s->stkctr1_entry->ref_cnt--;
stksess_kill_if_expired(s->stkctr1_table, s->stkctr1_entry);
s->stkctr1_entry = NULL;
}
}
/* Remove the refcount from the session counters tracked only by the backend if
* any, and clear the pointer to ensure this is only performed once. The caller
* is responsible for ensuring that the pointer is valid first.
*/
static inline void session_stop_backend_counters(struct session *s)
{
void *ptr;
if (!(s->flags & (SN_BE_TRACK_SC1|SN_BE_TRACK_SC2)))
return;
if ((s->flags & SN_BE_TRACK_SC1) && s->stkctr1_entry) {
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)--;
s->stkctr1_entry->ref_cnt--;
stksess_kill_if_expired(s->stkctr1_table, s->stkctr1_entry);
s->stkctr1_entry = NULL;
}
if ((s->flags & SN_BE_TRACK_SC2) && s->stkctr2_entry) {
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)--;
s->stkctr2_entry->ref_cnt--;
stksess_kill_if_expired(s->stkctr2_table, s->stkctr2_entry);
s->stkctr2_entry = NULL;
}
s->flags &= ~(SN_BE_TRACK_SC1|SN_BE_TRACK_SC2);
}
/* Increase total and concurrent connection count for stick entry <ts> of table
* <t>. The caller is responsible for ensuring that <t> and <ts> are valid
* pointers, and for calling this only once per connection.
*/
static inline void session_start_counters(struct stktable *t, struct stksess *ts)
{
void *ptr;
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CUR);
if (ptr)
stktable_data_cast(ptr, conn_cur)++;
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_CNT);
if (ptr)
stktable_data_cast(ptr, conn_cnt)++;
ptr = stktable_data_ptr(t, ts, STKTABLE_DT_CONN_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, conn_rate),
t->data_arg[STKTABLE_DT_CONN_RATE].u, 1);
if (tick_isset(t->expire))
ts->expire = tick_add(now_ms, MS_TO_TICKS(t->expire));
}
/* Enable tracking of session counters as stkctr1 on stksess <ts>. The caller is
* responsible for ensuring that <t> and <ts> are valid pointers. Some controls
* are performed to ensure the state can still change.
*/
static inline void session_track_stkctr1(struct session *s, struct stktable *t, struct stksess *ts)
{
if (s->stkctr1_entry)
return;
ts->ref_cnt++;
s->stkctr1_table = t;
s->stkctr1_entry = ts;
session_start_counters(t, ts);
}
/* Enable tracking of session counters as stkctr1 on stksess <ts>. The caller is
* responsible for ensuring that <t> and <ts> are valid pointers. Some controls
* are performed to ensure the state can still change.
*/
static inline void session_track_stkctr2(struct session *s, struct stktable *t, struct stksess *ts)
{
if (s->stkctr2_entry)
return;
ts->ref_cnt++;
s->stkctr2_table = t;
s->stkctr2_entry = ts;
session_start_counters(t, ts);
}
/* Increase the number of cumulated HTTP requests in the tracked counters */
static void inline session_inc_http_req_ctr(struct session *s)
{
void *ptr;
if (s->stkctr2_entry) {
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_HTTP_REQ_CNT);
if (ptr)
stktable_data_cast(ptr, http_req_cnt)++;
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_HTTP_REQ_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
s->stkctr2_table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
}
if (s->stkctr1_entry) {
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_HTTP_REQ_CNT);
if (ptr)
stktable_data_cast(ptr, http_req_cnt)++;
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_HTTP_REQ_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_req_rate),
s->stkctr1_table->data_arg[STKTABLE_DT_HTTP_REQ_RATE].u, 1);
}
}
/* Increase the number of cumulated failed HTTP requests in the tracked
* counters. Only 4xx requests should be counted here so that we can
* distinguish between errors caused by client behaviour and other ones.
* Note that even 404 are interesting because they're generally caused by
* vulnerability scans.
*/
static void inline session_inc_http_err_ctr(struct session *s)
{
void *ptr;
if (s->stkctr2_entry) {
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_HTTP_ERR_CNT);
if (ptr)
stktable_data_cast(ptr, http_err_cnt)++;
ptr = stktable_data_ptr(s->stkctr2_table, s->stkctr2_entry, STKTABLE_DT_HTTP_ERR_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_err_rate),
s->stkctr2_table->data_arg[STKTABLE_DT_HTTP_ERR_RATE].u, 1);
}
if (s->stkctr1_entry) {
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_HTTP_ERR_CNT);
if (ptr)
stktable_data_cast(ptr, http_err_cnt)++;
ptr = stktable_data_ptr(s->stkctr1_table, s->stkctr1_entry, STKTABLE_DT_HTTP_ERR_RATE);
if (ptr)
update_freq_ctr_period(&stktable_data_cast(ptr, http_err_rate),
s->stkctr1_table->data_arg[STKTABLE_DT_HTTP_ERR_RATE].u, 1);
}
}
static void inline session_add_srv_conn(struct session *sess, struct server *srv)
{
sess->srv_conn = srv;
LIST_ADD(&srv->actconns, &sess->by_srv);
}
static void inline session_del_srv_conn(struct session *sess)
{
if (!sess->srv_conn)
return;
sess->srv_conn = NULL;
LIST_DEL(&sess->by_srv);
}
static void inline session_init_srv_conn(struct session *sess)
{
sess->srv_conn = NULL;
LIST_INIT(&sess->by_srv);
}
#endif /* _PROTO_SESSION_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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