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/*
* $Id$
*
* nonce-count (nc) tracking
*
* Copyright (C) 2008 iptelorg GmbH
*
* This file is part of ser, a free SIP server.
*
* ser is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* ser 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Defines:
* USE_NC - if not defined no NC specific code will be compiled
*/
/*
* History:
* --------
* 2008-07-04 initial version (andrei)
*/
#ifndef _nc_h
#define _nc_h
extern int nc_enabled;
/* instead of storing only the 2^k size we store also k
* for faster operations */
extern unsigned nc_array_k; /* array size bits (k in 2^k) */
extern unsigned nc_array_size; /* 2^k == 1<<nc_array_bits */
#ifdef USE_NC
#include "nid.h" /* nid_t */
#include "../../atomic_ops.h"
/* default number of maximum in-flight nonces */
#define DEFAULT_NC_ARRAY_SIZE 1024*1024 /* uses 1Mb of memory */
#define MIN_NC_ARRAY_SIZE 102400 /* warn if size < 100k */
#define MAX_NC_ARRAY_SIZE 1024*1024*1024 /* warn if size > 1Gb */
#define MIN_NC_ARRAY_PARTITION 65536 /* warn if a partition is < 65k */
typedef unsigned char nc_t;
int init_nonce_count();
void destroy_nonce_count();
enum nc_check_ret{
NC_OK=0, NC_INV_POOL=-1, NC_ID_OVERFLOW=-2, NC_TOO_BIG=-3,
NC_REPLAY=-4
};
/* check if nonce-count nc w/ index i is expected/valid and record its
* value */
enum nc_check_ret nc_check_val(nid_t i, unsigned pool, unsigned int nc);
/* re-init the stored nc for nonce id in pool pool_no */
nid_t nc_new(nid_t id, unsigned char pool_no);
#endif /* USE_NC */
#endif /* _nc_h */
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