4d3bb14731
git-svn-id: https://origsvn.digium.com/svn/libpri/branches/1.4@1406 2fbb986a-6c06-0410-b554-c9c1f0a7f128
207 lines
6.1 KiB
C
207 lines
6.1 KiB
C
/*
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* libpri: An implementation of Primary Rate ISDN
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*
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* Written by Mark Spencer <markster@digium.com>
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*
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* Copyright (C) 2001, Digium, Inc.
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* All Rights Reserved.
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*/
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/*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2 as published by the
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* Free Software Foundation. See the LICENSE file included with
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* this program for more details.
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*
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* In addition, when this program is distributed with Asterisk in
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* any form that would qualify as a 'combined work' or as a
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* 'derivative work' (but not mere aggregation), you can redistribute
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* and/or modify the combination under the terms of the license
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* provided with that copy of Asterisk, instead of the license
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* terms granted here.
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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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#if defined(__linux__)
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#include <endian.h>
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#elif defined(__FreeBSD__)
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#include <sys/endian.h>
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#define __BYTE_ORDER _BYTE_ORDER
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#define __BIG_ENDIAN _BIG_ENDIAN
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#define __LITTLE_ENDIAN _LITTLE_ENDIAN
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#endif
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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 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_TEI_PRI 0
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#define Q921_TEI_GR303_EOC_PATH 0
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#define Q921_TEI_GR303_EOC_OPS 4
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#define Q921_TEI_GR303_TMC_SWITCHING 0
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#define Q921_TEI_GR303_TMC_CALLPROC 0
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#define Q921_SAPI_CALL_CTRL 0
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#define Q921_SAPI_GR303_EOC 1
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#define Q921_SAPI_GR303_TMC_SWITCHING 1
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#define Q921_SAPI_GR303_TMC_CALLPROC 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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#define Q921_TEI_IDENTITY_REQUEST 1
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#define Q921_TEI_IDENTITY_ASSIGNED 2
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#define Q921_TEI_IDENTITY_DENIED 3
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#define Q921_TEI_IDENTITY_CHECK_REQUEST 4
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#define Q921_TEI_IDENTITY_CHECK_RESPONSE 5
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#define Q921_TEI_IDENTITY_REMOVE 6
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#define Q921_TEI_IDENTITY_VERIFY 7
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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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} __attribute__ ((packed)) 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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} __attribute__ ((packed)) 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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} __attribute__ ((packed)) 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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int transmitted; /* Have we been transmitted */
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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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#define Q921_DEC(j) (j) = (((j) - 1) % 128)
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typedef enum q921_state {
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/* All states except Q921_DOWN are defined in Q.921 SDL diagrams */
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Q921_TEI_UNASSIGNED = 1,
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Q921_ASSIGN_AWAITING_TEI = 2,
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Q921_ESTABLISH_AWAITING_TEI = 3,
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Q921_TEI_ASSIGNED = 4,
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Q921_AWAITING_ESTABLISHMENT = 5,
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Q921_AWAITING_RELEASE = 6,
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Q921_MULTI_FRAME_ESTABLISHED = 7,
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Q921_TIMER_RECOVERY = 8,
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} q921_state;
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static inline int Q921_ADD(int a, int b)
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{
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return (a + b) % 128;
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}
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/* Dumps a *known good* Q.921 packet */
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extern void q921_dump(struct pri *pri, 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, int reset_iqueue);
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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, int tei, void *buf, int len, int cr);
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extern int q921_transmit_uiframe(struct pri *pri, void *buf, int len);
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extern pri_event *q921_dchannel_up(struct pri *pri);
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//extern pri_event *q921_dchannel_down(struct pri *pri);
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#endif
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