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/*
* include/types/stick_table.h
* Macros, variables and structures for stick tables management.
*
* Copyright (C) 2009-2010 EXCELIANCE, Emeric Brun <ebrun@exceliance.fr>
*
* 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 _TYPES_STICK_TABLE_H
#define _TYPES_STICK_TABLE_H
#include <sys/socket.h>
#include <netinet/in.h>
#include <ebtree.h>
#include <ebmbtree.h>
#include <eb32tree.h>
#include <common/memory.h>
/* stick table key types */
#define STKTABLE_TYPE_IP 0 /* table key is ipv4 */
#define STKTABLE_TYPE_INTEGER 1 /* table key is unsigned 32bit integer */
#define STKTABLE_TYPE_STRING 2 /* table key is a null terminated string */
#define STKTABLE_TYPES 3 /* Increase this value if you add a type */
/* stick table type flags */
#define STKTABLE_TYPEFLAG_CUSTOMKEYSIZE 0x00000001 /* this table type maxsize is configurable */
/* stick table keyword type */
struct stktable_type {
const char *kw; /* keyword string */
int flags; /* type flags */
size_t default_size; /* default key size */
};
/* stuck session */
struct stksess {
int sid; /* id of server to use for session */
unsigned int expire; /* session expiration date */
struct eb32_node exps; /* ebtree node used to hold the session in expiration tree */
struct ebmb_node keys; /* ebtree node used to hold the session in table */
};
/* stick table */
struct stktable {
struct eb_root keys; /* head of stuck session tree */
struct eb_root exps; /* head of stuck session expiration tree */
struct pool_head *pool; /* pool used to allocate stuck sessions */
struct task *exp_task; /* expiration task */
unsigned long type; /* type of table (determine key format) */
size_t key_size; /* size of a key, maximum size in case of string */
unsigned int size; /* maximum stuck session in table */
unsigned int current; /* number of stuck session in table */
int nopurge; /* 1 never purge stuck sessions */
int exp_next; /* next epiration date */
int expire; /* duration before expiration of stuck session */
};
/* stick table key data */
union stktable_key_data {
struct in_addr ip; /* used to store an ip key */
uint32_t integer; /* used to store an integer key */
char buf[BUFSIZE]; /* used to store a null terminated string key */
};
/* stick table key */
struct stktable_key {
void *key; /* pointer on key buffer */
size_t key_len; /* data len to read in buff in case of null terminated string */
union stktable_key_data data; /* data */
};
#endif /* _TYPES_STICK_TABLE_H */
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