/* * libpri: An implementation of Primary Rate ISDN * * Written by Mark Spencer * * Copyright (C) 2001, 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 _PRI_Q921_H #define _PRI_Q921_H #include #if defined(__linux__) #include #elif defined(__FreeBSD__) #include #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 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_PRI 0 #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 63 #define Q921_TEI_IDENTITY_REQUEST 1 #define Q921_TEI_IDENTITY_ASSIGNED 2 #define Q921_TEI_IDENTITY_DENIED 3 #define Q921_TEI_IDENTITY_CHECK_REQUEST 4 #define Q921_TEI_IDENTITY_CHECK_RESPONSE 5 #define Q921_TEI_IDENTITY_REMOVE 6 #define Q921_TEI_IDENTITY_VERIFY 7 typedef 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 */ } __attribute__ ((packed)) 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 */ } __attribute__ ((packed)) 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 */ } __attribute__ ((packed)) 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_DOWN = 0, Q921_TEI_UNASSIGNED, Q921_TEI_AWAITING_ESTABLISH, Q921_TEI_AWAITING_ASSIGN, Q921_TEI_ASSIGNED, Q921_NEGOTIATION, 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(struct pri *pri, 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); extern pri_event *q921_dchannel_up(struct pri *pri); extern pri_event *q921_dchannel_down(struct pri *pri); #endif