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161 lines
4.7 KiB
161 lines
4.7 KiB
/*
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* libpri: An implementation of Primary Rate ISDN
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*
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* Written by Mark Spencer <markster@linux-support.net>
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*
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* Copyright (C) 2001, Linux Support Services, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#ifndef _PRI_Q921_H
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#define _PRI_Q921_H
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#include <sys/types.h>
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#include <endian.h>
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/* Timer values */
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#define T_WAIT_MIN 2000
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#define T_WAIT_MAX 10000
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#define T_200 1000 /* 1 second between SABME's */
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#define T_203 10000 /* 10 seconds with no packets max */
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#define Q921_FRAMETYPE_MASK 0x3
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#define Q921_FRAMETYPE_U 0x3
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#define Q921_FRAMETYPE_I 0x0
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#define Q921_FRAMETYPE_S 0x1
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#define Q921_TEI_GROUP 127
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#define Q921_SAPI_CALL_CTRL 0
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#define Q921_SAPI_PACKET_MODE 1
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#define Q921_SAPI_X25_LAYER3 16
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#define Q921_SAPI_LAYER2_MANAGEMENT 63
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typedef struct q921_header {
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#if __BYTE_ORDER == __BIG_ENDIAN
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u_int8_t sapi:6; /* Service Access Point Indentifier (always 0 for PRI) (0) */
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u_int8_t c_r:1; /* Command/Response (0 if CPE, 1 if network) */
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u_int8_t ea1:1; /* Extended Address (0) */
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u_int8_t tei:7; /* Terminal Endpoint Identifier (0) */
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u_int8_t ea2:1; /* Extended Address Bit (1) */
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#else
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u_int8_t ea1:1; /* Extended Address (0) */
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u_int8_t c_r:1; /* Command/Response (0 if CPE, 1 if network) */
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u_int8_t sapi:6; /* Service Access Point Indentifier (always 0 for PRI) (0) */
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u_int8_t ea2:1; /* Extended Address Bit (1) */
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u_int8_t tei:7; /* Terminal Endpoint Identifier (0) */
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#endif
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u_int8_t data[0]; /* Further data */
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} q921_header;
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/* A Supervisory Format frame */
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typedef struct q921_s {
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struct q921_header h; /* Header */
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#if __BYTE_ORDER == __BIG_ENDIAN
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u_int8_t x0:4; /* Unused */
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u_int8_t ss:2; /* Supervisory frame bits */
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u_int8_t ft:2; /* Frame type bits (01) */
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u_int8_t n_r:7; /* Number Received */
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u_int8_t p_f:1; /* Poll/Final bit */
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#else
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u_int8_t ft:2; /* Frame type bits (01) */
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u_int8_t ss:2; /* Supervisory frame bits */
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u_int8_t x0:4; /* Unused */
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u_int8_t p_f:1; /* Poll/Final bit */
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u_int8_t n_r:7; /* Number Received */
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#endif
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u_int8_t data[0]; /* Any further data */
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u_int8_t fcs[2]; /* At least an FCS */
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} q921_s;
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/* An Unnumbered Format frame */
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typedef struct q921_u {
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struct q921_header h; /* Header */
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#if __BYTE_ORDER == __BIG_ENDIAN
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u_int8_t m3:3; /* Top 3 modifier bits */
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u_int8_t p_f:1; /* Poll/Final bit */
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u_int8_t m2:2; /* Two more modifier bits */
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u_int8_t ft:2; /* Frame type bits (11) */
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#else
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u_int8_t ft:2; /* Frame type bits (11) */
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u_int8_t m2:2; /* Two more modifier bits */
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u_int8_t p_f:1; /* Poll/Final bit */
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u_int8_t m3:3; /* Top 3 modifier bits */
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#endif
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u_int8_t data[0]; /* Any further data */
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u_int8_t fcs[2]; /* At least an FCS */
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} q921_u;
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/* An Information frame */
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typedef struct q921_i {
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struct q921_header h; /* Header */
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#if __BYTE_ORDER == __BIG_ENDIAN
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u_int8_t n_s:7; /* Number sent */
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u_int8_t ft:1; /* Frame type (0) */
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u_int8_t n_r:7; /* Number received */
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u_int8_t p_f:1; /* Poll/Final bit */
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#else
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u_int8_t ft:1; /* Frame type (0) */
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u_int8_t n_s:7; /* Number sent */
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u_int8_t p_f:1; /* Poll/Final bit */
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u_int8_t n_r:7; /* Number received */
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#endif
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u_int8_t data[0]; /* Any further data */
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u_int8_t fcs[2]; /* At least an FCS */
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} q921_i;
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typedef union {
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u_int8_t raw[0];
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q921_u u;
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q921_s s;
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q921_i i;
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struct q921_header h;
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} q921_h;
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typedef struct q921_frame {
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struct q921_frame *next; /* Next in list */
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int len; /* Length of header + body */
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q921_i h;
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} q921_frame;
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#define Q921_INC(j) (j) = ((j) + 1) % 128
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typedef enum q921_state {
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Q921_LINK_CONNECTION_RELEASED, /* Also known as TEI_ASSIGNED */
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Q921_LINK_CONNECTION_ESTABLISHED,
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Q921_AWAITING_ESTABLISH,
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Q921_AWAITING_RELEASE
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} q921_state;
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/* Dumps a *known good* Q.921 packet */
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extern void q921_dump(q921_h *h, int len, int showraw, int txrx);
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/* Bring up the D-channel */
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extern void q921_start(struct pri *pri);
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extern void q921_reset(struct pri *pri);
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extern pri_event *q921_receive(struct pri *pri, q921_h *h, int len);
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extern int q921_transmit_iframe(struct pri *pri, void *buf, int len, int cr);
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#endif
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