402 lines
9.9 KiB
C
402 lines
9.9 KiB
C
/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
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* 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
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/* (C) 2008 by Harald Welte <laforge@gnumonks.org>
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*
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <openbsc/msgb.h>
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#include <openbsc/debug.h>
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#include <openbsc/gsm_data.h>
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#include <openbsc/gsm_subscriber.h>
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#include <openbsc/gsm_04_08.h>
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#include <openbsc/abis_rsl.h>
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#define GSM48_ALLOC_SIZE 1024
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#define GSM48_ALLOC_HEADROOM 128
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struct gsm_lai {
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u_int16_t mcc;
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u_int16_t mnc;
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u_int16_t lac;
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};
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static void parse_lai(struct gsm_lai *lai, const struct gsm48_loc_area_id *lai48)
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{
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u_int8_t dig[4];
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/* MCC */
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dig[1] = lai48->digits[0] & 0x0f;
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dig[2] = lai48->digits[0] >> 4;
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dig[3] = lai48->digits[1] & 0x0f;
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lai->mcc = dig[3] * 100 + dig[2];
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/* MNC */
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dig[1] = lai48->digits[1] >> 4;
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dig[2] = lai48->digits[2] & 0x0f;
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dig[3] = lai48->digits[2] >> 4;
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lai->mnc = dig[3] * 100 + dig[2];
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lai->lac = lai48->lac;
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}
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static void to_bcd(u_int8_t *bcd, u_int16_t val)
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{
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bcd[0] = val % 10;
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val = val / 10;
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bcd[1] = val % 10;
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val = val / 10;
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bcd[2] = val % 10;
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val = val / 10;
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}
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static void generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc,
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u_int16_t mnc, u_int16_t lac)
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{
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u_int8_t bcd[3];
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to_bcd(bcd, mcc);
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lai48->digits[0] = bcd[0] | (bcd[1] << 4);
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lai48->digits[1] = bcd[2];
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to_bcd(bcd, mnc);
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lai48->digits[1] |= bcd[2] << 4;
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lai48->digits[2] = bcd[0] | (bcd[1] << 4);
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lai48->lac = lac;
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}
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#define TMSI_LEN 4
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#define MID_TMSI_LEN (TMSI_LEN + 2)
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static void generate_mid_from_tmsi(u_int8_t *buf, u_int8_t *tmsi_bcd)
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{
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buf[0] = MID_TMSI_LEN;
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buf[1] = 0xf0 | GSM_MI_TYPE_TMSI;
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buf[2] = tmsi_bcd[0];
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buf[3] = tmsi_bcd[1];
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buf[4] = tmsi_bcd[2];
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buf[5] = tmsi_bcd[3];
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}
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static struct msgb *gsm48_msgb_alloc(void)
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{
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return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM);
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}
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static int gsm0408_sendmsg(struct msgb *msg)
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{
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if (msg->lchan)
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msg->trx = msg->lchan->ts->trx;
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return rsl_data_request(msg, 0);
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}
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static int gsm0408_rcv_cc(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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switch (gh->msg_type & 0xbf) {
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case GSM48_MT_CC_CALL_CONF:
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/* Response to SETUP */
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DEBUGP(DCC, "CALL CONFIRM\n");
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break;
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case GSM48_MT_CC_RELEASE_COMPL:
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DEBUGP(DCC, "RELEASE COMPLETE\n");
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break;
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case GSM48_MT_CC_ALERTING:
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DEBUGP(DCC, "ALERTING\n");
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break;
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case GSM48_MT_CC_CONNECT:
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DEBUGP(DCC, "CONNECT\n");
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/* need to respond with CONNECT_ACK */
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break;
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case GSM48_MT_CC_RELEASE:
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DEBUGP(DCC, "RELEASE\n");
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/* need to respond with RELEASE_COMPLETE */
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break;
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case GSM48_MT_CC_EMERG_SETUP:
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//DEBUGP(DCC, "EMERGENCY SETUP\n");
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case GSM48_MT_CC_SETUP:
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//DEBUGP(DCC, "SETUP\n");
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/* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */
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default:
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fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n",
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gh->msg_type);
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break;
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}
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return 0;
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}
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/* Chapter 9.2.14 : Send LOCATION UPDATE REJECT */
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int gsm0408_loc_upd_rej(struct gsm_lchan *lchan, u_int8_t cause)
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{
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
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gh->data[0] = cause;
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DEBUGP(DMM, "-> LOCATION UPDATE REJECT\n");
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return gsm0408_sendmsg(msg);
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}
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/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */
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int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int8_t *tmsi)
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{
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struct gsm_bts *bts = lchan->ts->trx->bts;
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struct msgb *msg = gsm48_msgb_alloc();
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struct gsm48_hdr *gh;
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struct gsm48_loc_area_id *lai;
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u_int8_t *mid;
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msg->lchan = lchan;
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gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
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gh->proto_discr = GSM48_PDISC_MM;
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gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
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lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
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generate_lai(lai, bts->network->country_code,
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bts->network->network_code, bts->location_area_code);
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mid = msgb_put(msg, MID_TMSI_LEN);
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generate_mid_from_tmsi(mid, tmsi);
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DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n");
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return gsm0408_sendmsg(msg);
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}
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/* Chapter 9.2.15 */
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static int mm_loc_upd_req(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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struct gsm_bts *bts = msg->bts_link->bts;
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struct gsm48_loc_upd_req *lu;
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struct gsm_subscriber *subscr;
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u_int8_t mi_type;
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lu = (struct gsm48_loc_upd_req *) gh->data;
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mi_type = lu->mi[0] & GSM_MI_TYPE_MASK;
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switch (mi_type) {
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case GSM_MI_TYPE_IMSI:
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/* look up subscriber based on IMSI */
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subscr = subscr_get_by_imsi(&lu->mi[1]);
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break;
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case GSM_MI_TYPE_TMSI:
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/* look up the subscriber based on TMSI, request IMSI if it fails */
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subscr = subscr_get_by_tmsi(&lu->mi[1]);
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if (!subscr) {
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/* FIXME: send IDENTITY REQUEST message to get IMSI */
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//gsm0408_identity_request(...GSM_MI_TYPE_IMSI);
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}
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break;
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case GSM_MI_TYPE_IMEI:
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case GSM_MI_TYPE_IMEISV:
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/* no sim card... FIXME: what to do ? */
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fprintf(stderr, "Unimplemented mobile identity type\n");
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break;
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default:
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fprintf(stderr, "Unknown mobile identity type\n");
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break;
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}
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if (!subscr) {
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/* 0x16 is congestion */
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gsm0408_loc_upd_rej(msg->lchan, 0x16);
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return -EINVAL;
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}
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msg->lchan->subscr = subscr;
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subscr_update(subscr, bts);
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return gsm0408_loc_upd_acc(msg->lchan, subscr->tmsi);
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}
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static int gsm0408_rcv_mm(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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int rc;
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switch (gh->msg_type & 0xbf) {
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case GSM48_MT_MM_LOC_UPD_REQUEST:
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DEBUGP(DMM, "LOCATION UPDATE REQUEST\n");
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rc = mm_loc_upd_req(msg);
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break;
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case GSM48_MT_MM_ID_RESP:
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case GSM48_MT_MM_TMSI_REALL_COMPL:
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case GSM48_MT_MM_AUTH_RESP:
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case GSM48_MT_MM_IMSI_DETACH_IND:
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case GSM48_MT_MM_CM_SERV_REQ:
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case GSM48_MT_MM_CM_REEST_REQ:
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fprintf(stderr, "Unimplemented GSM 04.08 MM msg type 0x%02x\n",
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gh->msg_type);
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break;
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default:
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fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n",
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gh->msg_type);
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break;
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}
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return rc;
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}
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static int gsm0408_rcv_rr(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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switch (gh->msg_type) {
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case GSM48_MT_RR_CLSM_CHG:
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DEBUGP(DRR, "CLASSMARK CHANGE\n");
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/* FIXME: what to do ?!? */
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break;
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case GSM48_MT_RR_PAG_RESP:
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default:
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fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n",
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gh->msg_type);
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break;
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}
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return 0;
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}
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/* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */
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int gsm0408_rcvmsg(struct msgb *msg)
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{
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struct gsm48_hdr *gh = msgb_l3(msg);
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u_int8_t pdisc = gh->proto_discr & 0x0f;
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int rc = 0;
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switch (pdisc) {
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case GSM48_PDISC_CC:
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rc = gsm0408_rcv_cc(msg);
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break;
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case GSM48_PDISC_MM:
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rc = gsm0408_rcv_mm(msg);
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break;
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case GSM48_PDISC_RR:
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rc = gsm0408_rcv_rr(msg);
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break;
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case GSM48_PDISC_MM_GPRS:
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case GSM48_PDISC_SM:
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fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n",
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pdisc);
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break;
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default:
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fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n",
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pdisc);
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break;
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}
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return rc;
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}
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enum chreq_type {
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CHREQ_T_EMERG_CALL,
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CHREQ_T_CALL_REEST_TCH_F,
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CHREQ_T_CALL_REEST_TCH_H,
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CHREQ_T_CALL_REEST_TCH_H_DBL,
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CHREQ_T_SDCCH,
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CHREQ_T_TCH_F,
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CHREQ_T_VOICE_CALL_TCH_H,
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CHREQ_T_DATA_CALL_TCH_H,
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CHREQ_T_LOCATION_UPD,
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CHREQ_T_PAG_R_ANY,
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CHREQ_T_PAG_R_TCH_F,
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CHREQ_T_PAG_R_TCH_FH,
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};
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/* Section 9.1.8 / Table 9.9 */
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struct chreq {
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u_int8_t val;
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u_int8_t mask;
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enum chreq_type type;
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};
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/* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */
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static const struct chreq chreq_type_neci1[] = {
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{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
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{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
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{ 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
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{ 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
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{ 0xe0, 0xe0, CHREQ_T_SDCCH },
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{ 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
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{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
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{ 0x00, 0xf0, CHREQ_T_LOCATION_UPD },
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{ 0x10, 0xf0, CHREQ_T_SDCCH },
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{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
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{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
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{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
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};
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/* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */
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static const struct chreq chreq_type_neci0[] = {
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{ 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
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{ 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H },
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{ 0xe0, 0xe0, CHREQ_T_TCH_F },
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{ 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
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{ 0x00, 0xe0, CHREQ_T_LOCATION_UPD },
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{ 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
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{ 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
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{ 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
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};
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static const enum gsm_chan_t ctype_by_chreq[] = {
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[CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F,
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[CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F,
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[CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H,
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[CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H,
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[CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH,
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[CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F,
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[CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H,
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[CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H,
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[CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH,
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[CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH,
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[CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F,
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[CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F,
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};
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enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra)
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{
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int i;
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/* FIXME: determine if we set NECI = 0 in the BTS SI4 */
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for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) {
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const struct chreq *chr = &chreq_type_neci0[i];
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if ((ra & chr->mask) == chr->val)
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return ctype_by_chreq[chr->type];
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}
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fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra);
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return GSM_LCHAN_SDCCH;
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}
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