/* * libpri: An implementation of Primary Rate ISDN * * Written by Mark Spencer <markster@linux-support.net> * * Copyright (C) 2001, Linux Support Services, Inc. * All Rights Reserved. * * This program 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. *  * This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.  * */ #ifndef _PRI_Q921_H#define _PRI_Q921_H#include <sys/types.h>#if defined(__linux__)#include <endian.h>#elif defined(__FreeBSD__)#include <sys/endian.h>#define __BYTE_ORDER _BYTE_ORDER#define __BIG_ENDIAN _BIG_ENDIAN#define __LITTLE_ENDIAN _LITTLE_ENDIAN#endif/* Timer values */#define T_WAIT_MIN	2000#define T_WAIT_MAX	10000#define T_200		1000		/* 1 second between SABME's */#define T_203		10000		/* 10 seconds with no packets max */#define N_200		3		/* 3 retries */#define Q921_FRAMETYPE_MASK	0x3#define Q921_FRAMETYPE_U	0x3#define Q921_FRAMETYPE_I	0x0#define Q921_FRAMETYPE_S	0x1#define Q921_TEI_GROUP				127#define Q921_TEI_GR303_EOC_PATH			0#define Q921_TEI_GR303_EOC_OPS			4#define Q921_TEI_GR303_TMC_SWITCHING		0#define Q921_TEI_GR303_TMC_CALLPROC		0#define Q921_SAPI_CALL_CTRL		0#define Q921_SAPI_GR303_EOC		1#define Q921_SAPI_GR303_TMC_SWITCHING	1#define Q921_SAPI_GR303_TMC_CALLPROC	0#define Q921_SAPI_PACKET_MODE		1#define Q921_SAPI_X25_LAYER3      	16#define Q921_SAPI_LAYER2_MANAGEMENT	63typedef struct q921_header {#if __BYTE_ORDER == __BIG_ENDIAN	u_int8_t	sapi:6;	/* Service Access Point Indentifier (always 0 for PRI) (0) */	u_int8_t	c_r:1;		/* Command/Response (0 if CPE, 1 if network) */	u_int8_t	ea1:1;		/* Extended Address (0) */	u_int8_t	tei:7;		/* Terminal Endpoint Identifier (0) */	u_int8_t	ea2:1;		/* Extended Address Bit (1) */#else		u_int8_t	ea1:1;		/* Extended Address (0) */	u_int8_t	c_r:1;		/* Command/Response (0 if CPE, 1 if network) */	u_int8_t	sapi:6;	/* Service Access Point Indentifier (always 0 for PRI) (0) */	u_int8_t	ea2:1;		/* Extended Address Bit (1) */	u_int8_t	tei:7;		/* Terminal Endpoint Identifier (0) */#endif	u_int8_t	data[0];	/* Further data */} q921_header;/* A Supervisory Format frame */typedef struct q921_s {	struct q921_header h;	/* Header */#if __BYTE_ORDER == __BIG_ENDIAN	u_int8_t x0:4;			/* Unused */	u_int8_t ss:2;			/* Supervisory frame bits */	u_int8_t ft:2;			/* Frame type bits (01) */	u_int8_t n_r:7;			/* Number Received */	u_int8_t p_f:1;			/* Poll/Final bit */#else		u_int8_t ft:2;			/* Frame type bits (01) */	u_int8_t ss:2;			/* Supervisory frame bits */	u_int8_t x0:4;			/* Unused */	u_int8_t p_f:1;			/* Poll/Final bit */	u_int8_t n_r:7;			/* Number Received */#endif	u_int8_t data[0];		/* Any further data */	u_int8_t fcs[2];		/* At least an FCS */} q921_s;/* An Unnumbered Format frame */typedef struct q921_u {	struct q921_header h;	/* Header */#if __BYTE_ORDER == __BIG_ENDIAN	u_int8_t m3:3;			/* Top 3 modifier bits */	u_int8_t p_f:1;			/* Poll/Final bit */	u_int8_t m2:2;			/* Two more modifier bits */	u_int8_t ft:2;			/* Frame type bits (11) */#else		u_int8_t ft:2;			/* Frame type bits (11) */	u_int8_t m2:2;			/* Two more modifier bits */	u_int8_t p_f:1;			/* Poll/Final bit */	u_int8_t m3:3;			/* Top 3 modifier bits */#endif	u_int8_t data[0];		/* Any further data */	u_int8_t fcs[2];		/* At least an FCS */} q921_u;/* An Information frame */typedef struct q921_i {	struct q921_header h;	/* Header */#if __BYTE_ORDER == __BIG_ENDIAN	u_int8_t n_s:7;			/* Number sent */	u_int8_t ft:1;			/* Frame type (0) */	u_int8_t n_r:7;			/* Number received */	u_int8_t p_f:1;			/* Poll/Final bit */	#else		u_int8_t ft:1;			/* Frame type (0) */	u_int8_t n_s:7;			/* Number sent */	u_int8_t p_f:1;			/* Poll/Final bit */		u_int8_t n_r:7;			/* Number received */#endif	u_int8_t data[0];		/* Any further data */	u_int8_t fcs[2];		/* At least an FCS */} q921_i;typedef union {	u_int8_t raw[0];	q921_u u;	q921_s s;	q921_i i;	struct q921_header h;} q921_h;typedef struct q921_frame {	struct q921_frame *next;	/* Next in list */	int len;					/* Length of header + body */	int transmitted;			/* Have we been transmitted */	q921_i h;} q921_frame;#define Q921_INC(j) (j) = (((j) + 1) % 128)typedef enum q921_state {	Q921_LINK_CONNECTION_RELEASED,	/* Also known as TEI_ASSIGNED */	Q921_LINK_CONNECTION_ESTABLISHED,	Q921_AWAITING_ESTABLISH,	Q921_AWAITING_RELEASE} q921_state;/* Dumps a *known good* Q.921 packet */extern void q921_dump(q921_h *h, int len, int showraw, int txrx);/* Bring up the D-channel */extern void q921_start(struct pri *pri, int now);extern void q921_reset(struct pri *pri);extern pri_event *q921_receive(struct pri *pri, q921_h *h, int len);extern int q921_transmit_iframe(struct pri *pri, void *buf, int len, int cr);#endif