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/*
* libss7: An implementation of Signalling System 7
*
* Written by Matthew Fredrickson <creslin@digium.com>
*
* scheduling routines taken from libpri by Mark Spencer <markster@digium.com>
*
* Copyright (C) 2006-2008, Digium, Inc
* All Rights Reserved.
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*
* In addition, when this program is distributed with Asterisk in
* any form that would qualify as a 'combined work' or as a
* 'derivative work' (but not mere aggregation), you can redistribute
* and/or modify the combination under the terms of the license
* provided with that copy of Asterisk, instead of the license
* terms granted here.
*/
#ifndef _SS7_MTP_H
#define _SS7_MTP_H
#include "ss7_internal.h"
/* Code for extended length of message, i.e. greater than 62 octects */
#define MTP2_LI_MAX 63
#define SIF_MAX_SIZE 272
#define MTP2_SU_HEAD_SIZE 3
#define MTP2_SIZE MTP2_SU_HEAD_SIZE
/* MTP2 Timers */
/* For ITU 64kbps links */
#define ITU_TIMER_T1 45000
#define ITU_TIMER_T2 50000
#define ITU_TIMER_T3 1500
#define ITU_TIMER_T4_NORMAL 8500
#define ITU_TIMER_T4_EMERGENCY 500
#define ITU_TIMER_T7 1250
/* For ANSI links */
#define ANSI_TIMER_T1 16000
#define ANSI_TIMER_T2 11500
#define ANSI_TIMER_T3 11500
#define ANSI_TIMER_T4_NORMAL 2300
#define ANSI_TIMER_T4_EMERGENCY 600
#define ANSI_TIMER_T7 1250
/* Bottom 3 bits in LSSU status field */
#define LSSU_SIO 0 /* Out of alignment */
#define LSSU_SIN 1 /* Normal alignament */
#define LSSU_SIE 2 /* Emergency alignment */
#define LSSU_SIOS 3 /* Out of Service */
#define LSSU_SIPO 4 /* MTP2 cannot reach MTP3, useless for us */
#define LSSU_SIB 5 /* MTP2 congestion */
#define FISU 6
/* More MTP2 definitions */
/* Various sizes */
#define MTP_MAX_SIZE 277 /* 276 + 1 for RSIS */
#define LSSU_SIZE 6
#define FISU_SIZE 5
/* MTP2 Link states */
#define MTP_IDLE 0
#define MTP_NOTALIGNED 1
#define MTP_ALIGNED 2
#define MTP_PROVING 3
#define MTP_ALIGNEDREADY 4
#define MTP_INSERVICE 5
#define MTP_ALARM 6
struct mtp_su_head {
/* Common header for all signaling units */
unsigned char bsn:7;
unsigned char bib:1;
unsigned char fsn:7;
unsigned char fib:1;
unsigned char li:6;
unsigned char spare:2;
unsigned char data[0];
} __attribute__((packed));
struct ss7;
struct mtp2_timers {
int t1;
int t2;
int t3;
int t4;
int t4e;
int t7;
};
struct mtp2 {
int state;
int std_test_passed;
int inhibit;
int changeover;
unsigned int got_sent_netmsg;
struct ss7_msg *co_buf;
struct ss7_msg *cb_buf;
unsigned char curfsn:7;
unsigned char curfib:1;
unsigned char lastfsnacked:7;
unsigned char co_lastfsnacked:7; /* store here before reset_mtp clear */
unsigned char curbib:1;
int fd;
int flags;
int mtp3_timer[MTP3_MAX_TIMERS];
int q707_t1_failed;
/* Timers */
int t1;
int t2;
int t3;
int t4;
int t7;
struct mtp2_timers timers;
int slc;
int net_mng_sls;
int emergency;
int provingperiod;
unsigned int dpc;
int autotxsutype;
int lastsurxd;
int lastsutxd;
/* Line related stats */
unsigned int retransmissioncount;
struct ss7_msg *tx_buf;
struct ss7_msg *tx_q;
struct ss7_msg *retransmit_pos;
struct ss7_msg *co_tx_buf; /* store here before reset_mtp flush it */
struct ss7_msg *co_tx_q;
struct adjacent_sp *adj_sp;
unsigned char cb_seq;
struct ss7 *master;
};
/* Flags for the struct mtp2 flags parameter */
#define MTP2_FLAG_DAHDIMTP2 (1 << 0)
#define MTP2_FLAG_WRITE (1 << 1)
/* Initialize MTP link */
int mtp2_start(struct mtp2 *link, int emergency);
int mtp2_stop(struct mtp2 *link);
int mtp2_alarm(struct mtp2 *link);
int mtp2_noalarm(struct mtp2 *link);
int mtp2_setstate(struct mtp2 *link, int state);
struct mtp2 * mtp2_new(int fd, unsigned int switchtype);
int mtp2_transmit(struct mtp2 *link);
int mtp2_receive(struct mtp2 *link, unsigned char *buf, int len);
int mtp2_msu(struct mtp2 *link, struct ss7_msg *m);
void mtp2_dump(struct mtp2 *link, char prefix, unsigned char *buf, int len);
char *linkstate2strext(int linkstate);
void update_txbuf(struct mtp2 *link, struct ss7_msg **buf, unsigned char upto);
int len_buf(struct ss7_msg *buf);
void flush_bufs(struct mtp2 *link);
#endif /* _SS7_MTP_H */
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