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A server can only be deleted if there is no elements which reference it. This is taken care via srv_check_for_deletion(), most notably for active and idle connections. A special case occurs for connections directly managed by a session. This is for so-called private connections, when using http-reuse never or H2 + http-reuse safe for example. In this case. server does not account these connections into its idle lists. This caused a bug as the server is deleted despite the session still being able to access it. To properly fix this, add a new referencing element into the server for these session connections. A mt_list has been chosen for this. On default http-reuse, private connections are typically not used so it won't make any difference. If using H2 servers, or more generally when dealing with private connections, insert/delete should typically occur only once per session lifetime so impact on performance should be minimal. This should be backported up to 2.4. Note that srv_check_for_deletion() was introduced in 3.0 dev tree. On backport, the extra condition in it should be placed in cli_parse_delete_server() instead.
85 lines
3.1 KiB
C
85 lines
3.1 KiB
C
/*
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* include/haproxy/session-t.h
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* This file defines everything related to sessions.
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*
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* Copyright (C) 2000-2020 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 _HAPROXY_SESSION_T_H
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#define _HAPROXY_SESSION_T_H
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#include <sys/time.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <haproxy/api-t.h>
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#include <haproxy/obj_type-t.h>
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#include <haproxy/stick_table-t.h>
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#include <haproxy/task-t.h>
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#include <haproxy/vars-t.h>
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/* session flags */
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enum {
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SESS_FL_NONE = 0x00000000, /* nothing */
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SESS_FL_PREFER_LAST = 0x00000001, /* NTML authent, we should reuse last conn */
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};
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/* max number of idle server connections kept attached to a session */
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#define MAX_SRV_LIST 5
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struct session {
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struct proxy *fe; /* the proxy this session depends on for the client side */
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struct listener *listener; /* the listener by which the request arrived */
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enum obj_type *origin; /* the connection / applet which initiated this session */
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struct timeval accept_date; /* date of the session's accept() in user date */
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ullong accept_ts; /* date of the session's accept() in internal date (monotonic) */
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struct stkctr *stkctr; /* stick counters for tcp-connection */
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struct vars vars; /* list of variables for the session scope. */
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struct task *task; /* handshake timeout processing */
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long t_handshake; /* handshake duration, -1 = not completed */
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long t_idle; /* idle duration, -1 if never occurs */
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int idle_conns; /* Number of connections we're currently responsible for that we are not using */
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unsigned int flags; /* session flags, SESS_FL_* */
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struct list priv_conns; /* list of private conns */
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struct sockaddr_storage *src; /* source address (pool), when known, otherwise NULL */
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struct sockaddr_storage *dst; /* destination address (pool), when known, otherwise NULL */
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};
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/*
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* List of private conns managed by a session, indexed by server
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* Stored both into the session and server instances
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*/
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struct sess_priv_conns {
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void *target; /* Server or dispatch used for indexing */
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struct list conn_list; /* Head of the connections list */
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struct list sess_el; /* Element of session.priv_conns */
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struct mt_list srv_el; /* Element of server.sess_conns */
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};
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#endif /* _HAPROXY_SESSION_T_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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