Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 1 | /* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface |
| 2 | * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| 3 | |
| 4 | /* (C) 2008 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 5 | * |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <string.h> |
| 28 | #include <errno.h> |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 29 | #include <netinet/in.h> |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 30 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 31 | #include <openbsc/msgb.h> |
| 32 | #include <openbsc/debug.h> |
| 33 | #include <openbsc/gsm_data.h> |
| 34 | #include <openbsc/gsm_subscriber.h> |
| 35 | #include <openbsc/gsm_04_08.h> |
| 36 | #include <openbsc/abis_rsl.h> |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 37 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 38 | #define GSM48_ALLOC_SIZE 1024 |
| 39 | #define GSM48_ALLOC_HEADROOM 128 |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 40 | |
| 41 | struct gsm_lai { |
| 42 | u_int16_t mcc; |
| 43 | u_int16_t mnc; |
| 44 | u_int16_t lac; |
| 45 | }; |
| 46 | |
| 47 | static void parse_lai(struct gsm_lai *lai, const struct gsm48_loc_area_id *lai48) |
| 48 | { |
| 49 | u_int8_t dig[4]; |
| 50 | |
| 51 | /* MCC */ |
| 52 | dig[1] = lai48->digits[0] & 0x0f; |
| 53 | dig[2] = lai48->digits[0] >> 4; |
| 54 | dig[3] = lai48->digits[1] & 0x0f; |
| 55 | lai->mcc = dig[3] * 100 + dig[2]; |
| 56 | |
| 57 | /* MNC */ |
| 58 | dig[1] = lai48->digits[1] >> 4; |
| 59 | dig[2] = lai48->digits[2] & 0x0f; |
| 60 | dig[3] = lai48->digits[2] >> 4; |
| 61 | lai->mnc = dig[3] * 100 + dig[2]; |
| 62 | |
| 63 | lai->lac = lai48->lac; |
| 64 | } |
| 65 | |
| 66 | static void to_bcd(u_int8_t *bcd, u_int16_t val) |
| 67 | { |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 68 | bcd[2] = val % 10; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 69 | val = val / 10; |
| 70 | bcd[1] = val % 10; |
| 71 | val = val / 10; |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 72 | bcd[0] = val % 10; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 73 | val = val / 10; |
| 74 | } |
| 75 | |
| 76 | static void generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc, |
| 77 | u_int16_t mnc, u_int16_t lac) |
| 78 | { |
| 79 | u_int8_t bcd[3]; |
| 80 | |
| 81 | to_bcd(bcd, mcc); |
| 82 | lai48->digits[0] = bcd[0] | (bcd[1] << 4); |
| 83 | lai48->digits[1] = bcd[2]; |
| 84 | |
| 85 | to_bcd(bcd, mnc); |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 86 | /* FIXME: do we need three-digit MNC? See Table 10.5.3 */ |
| 87 | #if 0 |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 88 | lai48->digits[1] |= bcd[2] << 4; |
| 89 | lai48->digits[2] = bcd[0] | (bcd[1] << 4); |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 90 | #else |
| 91 | lai48->digits[1] |= 0xf << 4; |
| 92 | lai48->digits[2] = bcd[1] | (bcd[2] << 4); |
| 93 | #endif |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 94 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 95 | lai48->lac = htons(lac); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | #define TMSI_LEN 4 |
| 99 | #define MID_TMSI_LEN (TMSI_LEN + 2) |
| 100 | |
| 101 | static void generate_mid_from_tmsi(u_int8_t *buf, u_int8_t *tmsi_bcd) |
| 102 | { |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 103 | buf[0] = GSM48_IE_MOBILE_ID; |
| 104 | buf[1] = MID_TMSI_LEN; |
| 105 | buf[2] = 0xf0 | GSM_MI_TYPE_TMSI; |
| 106 | buf[3] = tmsi_bcd[0]; |
| 107 | buf[4] = tmsi_bcd[1]; |
| 108 | buf[5] = tmsi_bcd[2]; |
| 109 | buf[6] = tmsi_bcd[3]; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 110 | } |
| 111 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 112 | static struct msgb *gsm48_msgb_alloc(void) |
| 113 | { |
| 114 | return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM); |
| 115 | } |
| 116 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 117 | static int gsm0408_sendmsg(struct msgb *msg) |
| 118 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 119 | if (msg->lchan) |
| 120 | msg->trx = msg->lchan->ts->trx; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 121 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 122 | msg->l3h = msg->data; |
| 123 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 124 | return rsl_data_request(msg, 0); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 125 | } |
| 126 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 127 | static int gsm48_cc_tx_status(struct gsm_lchan *lchan) |
| 128 | { |
| 129 | struct msgb *msg = gsm48_msgb_alloc(); |
| 130 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 131 | u_int8_t *cause, *call_state; |
| 132 | |
| 133 | msg->lchan = lchan; |
| 134 | |
| 135 | gh->proto_discr = GSM48_PDISC_CC; |
| 136 | gh->msg_type = GSM48_MT_CC_STATUS; |
| 137 | |
| 138 | cause = msgb_put(msg, 3); |
| 139 | cause[0] = 2; |
| 140 | cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER; |
| 141 | cause[2] = 0x80 | 30; /* response to status inquiry */ |
| 142 | |
| 143 | call_state = msgb_put(msg, 1); |
| 144 | call_state[0] = 0xc0 | 0x00; |
| 145 | |
| 146 | return gsm0408_sendmsg(msg); |
| 147 | } |
| 148 | |
| 149 | static int gsm48_cc_rx_status_enq(struct msgb *msg) |
| 150 | { |
| 151 | return gsm48_cc_tx_status(msg->lchan); |
| 152 | } |
| 153 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 154 | static int gsm0408_rcv_cc(struct msgb *msg) |
| 155 | { |
| 156 | struct gsm48_hdr *gh = msgb_l3(msg); |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 157 | u_int8_t msg_type = gh->msg_type & 0xbf; |
| 158 | int rc = 0; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 159 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 160 | switch (msg_type) { |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 161 | case GSM48_MT_CC_CALL_CONF: |
| 162 | /* Response to SETUP */ |
| 163 | DEBUGP(DCC, "CALL CONFIRM\n"); |
| 164 | break; |
| 165 | case GSM48_MT_CC_RELEASE_COMPL: |
| 166 | DEBUGP(DCC, "RELEASE COMPLETE\n"); |
| 167 | break; |
| 168 | case GSM48_MT_CC_ALERTING: |
| 169 | DEBUGP(DCC, "ALERTING\n"); |
| 170 | break; |
| 171 | case GSM48_MT_CC_CONNECT: |
| 172 | DEBUGP(DCC, "CONNECT\n"); |
| 173 | /* need to respond with CONNECT_ACK */ |
| 174 | break; |
| 175 | case GSM48_MT_CC_RELEASE: |
| 176 | DEBUGP(DCC, "RELEASE\n"); |
| 177 | /* need to respond with RELEASE_COMPLETE */ |
| 178 | break; |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 179 | case GSM48_MT_CC_STATUS_ENQ: |
| 180 | rc = gsm48_cc_rx_status_enq(msg); |
| 181 | break; |
| 182 | case GSM48_MT_CC_DISCONNECT: |
| 183 | DEBUGP(DCC, "DISCONNECT\n"); |
| 184 | break; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 185 | case GSM48_MT_CC_SETUP: |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 186 | DEBUGP(DCC, "SETUP\n"); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 187 | /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */ |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 188 | break; |
| 189 | case GSM48_MT_CC_EMERG_SETUP: |
| 190 | DEBUGP(DCC, "EMERGENCY SETUP\n"); |
| 191 | /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */ |
| 192 | break; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 193 | default: |
| 194 | fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n", |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 195 | msg_type); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 196 | break; |
| 197 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 198 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 199 | return rc; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | /* Chapter 9.2.14 : Send LOCATION UPDATE REJECT */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 203 | int gsm0408_loc_upd_rej(struct gsm_lchan *lchan, u_int8_t cause) |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 204 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 205 | struct msgb *msg = gsm48_msgb_alloc(); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 206 | struct gsm48_hdr *gh; |
| 207 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 208 | msg->lchan = lchan; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 209 | |
| 210 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 211 | gh->proto_discr = GSM48_PDISC_MM; |
| 212 | gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; |
| 213 | gh->data[0] = cause; |
| 214 | |
| 215 | DEBUGP(DMM, "-> LOCATION UPDATE REJECT\n"); |
| 216 | |
| 217 | return gsm0408_sendmsg(msg); |
| 218 | } |
| 219 | |
| 220 | /* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 221 | int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int8_t *tmsi) |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 222 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 223 | struct gsm_bts *bts = lchan->ts->trx->bts; |
| 224 | struct msgb *msg = gsm48_msgb_alloc(); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 225 | struct gsm48_hdr *gh; |
| 226 | struct gsm48_loc_area_id *lai; |
| 227 | u_int8_t *mid; |
| 228 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 229 | msg->lchan = lchan; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 230 | |
| 231 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 232 | gh->proto_discr = GSM48_PDISC_MM; |
| 233 | gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; |
| 234 | |
| 235 | lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); |
| 236 | generate_lai(lai, bts->network->country_code, |
| 237 | bts->network->network_code, bts->location_area_code); |
| 238 | |
| 239 | mid = msgb_put(msg, MID_TMSI_LEN); |
| 240 | generate_mid_from_tmsi(mid, tmsi); |
| 241 | |
| 242 | DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n"); |
| 243 | |
| 244 | return gsm0408_sendmsg(msg); |
| 245 | } |
| 246 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 247 | /* Chapter 9.2.15 */ |
| 248 | static int mm_loc_upd_req(struct msgb *msg) |
| 249 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 250 | struct gsm48_hdr *gh = msgb_l3(msg); |
Harald Welte | 702d870 | 2008-12-26 20:25:35 +0000 | [diff] [blame] | 251 | struct gsm_bts *bts = msg->trx->bts; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 252 | struct gsm48_loc_upd_req *lu; |
| 253 | struct gsm_subscriber *subscr; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 254 | u_int8_t mi_type; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 255 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 256 | lu = (struct gsm48_loc_upd_req *) gh->data; |
| 257 | |
| 258 | mi_type = lu->mi[0] & GSM_MI_TYPE_MASK; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 259 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 260 | DEBUGP(DMM, "LUPDREQ: mi_type = 0x%02x\n", mi_type); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 261 | switch (mi_type) { |
| 262 | case GSM_MI_TYPE_IMSI: |
| 263 | /* look up subscriber based on IMSI */ |
| 264 | subscr = subscr_get_by_imsi(&lu->mi[1]); |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 265 | break; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 266 | case GSM_MI_TYPE_TMSI: |
| 267 | /* look up the subscriber based on TMSI, request IMSI if it fails */ |
| 268 | subscr = subscr_get_by_tmsi(&lu->mi[1]); |
| 269 | if (!subscr) { |
| 270 | /* FIXME: send IDENTITY REQUEST message to get IMSI */ |
| 271 | //gsm0408_identity_request(...GSM_MI_TYPE_IMSI); |
| 272 | } |
| 273 | break; |
| 274 | case GSM_MI_TYPE_IMEI: |
| 275 | case GSM_MI_TYPE_IMEISV: |
| 276 | /* no sim card... FIXME: what to do ? */ |
| 277 | fprintf(stderr, "Unimplemented mobile identity type\n"); |
| 278 | break; |
| 279 | default: |
| 280 | fprintf(stderr, "Unknown mobile identity type\n"); |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | if (!subscr) { |
| 285 | /* 0x16 is congestion */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 286 | gsm0408_loc_upd_rej(msg->lchan, 0x16); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 287 | return -EINVAL; |
| 288 | } |
| 289 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 290 | msg->lchan->subscr = subscr; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 291 | subscr_update(subscr, bts); |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 292 | |
| 293 | return gsm0408_loc_upd_acc(msg->lchan, subscr->tmsi); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 294 | } |
| 295 | |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 296 | static int gsm48_tx_mm_serv_ack(struct gsm_lchan *lchan) |
| 297 | { |
| 298 | struct msgb *msg = gsm48_msgb_alloc(); |
| 299 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 300 | |
| 301 | msg->lchan = lchan; |
| 302 | |
| 303 | gh->proto_discr = GSM48_PDISC_MM; |
| 304 | gh->msg_type = GSM48_MT_MM_CM_SERV_ACC; |
| 305 | |
| 306 | DEBUGP(DMM, "-> CM SERVICE ACK\n"); |
| 307 | |
| 308 | return gsm0408_sendmsg(msg); |
| 309 | } |
| 310 | |
| 311 | static int gsm48_rx_mm_serv_req(struct msgb *msg) |
| 312 | { |
| 313 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 314 | |
| 315 | DEBUGP(DMM, "CM SERVICE REQUEST\n"); |
| 316 | return gsm48_tx_mm_serv_ack(msg->lchan); |
| 317 | } |
| 318 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 319 | static int gsm0408_rcv_mm(struct msgb *msg) |
| 320 | { |
| 321 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 322 | int rc; |
| 323 | |
| 324 | switch (gh->msg_type & 0xbf) { |
| 325 | case GSM48_MT_MM_LOC_UPD_REQUEST: |
| 326 | DEBUGP(DMM, "LOCATION UPDATE REQUEST\n"); |
| 327 | rc = mm_loc_upd_req(msg); |
| 328 | break; |
| 329 | case GSM48_MT_MM_ID_RESP: |
| 330 | case GSM48_MT_MM_TMSI_REALL_COMPL: |
| 331 | case GSM48_MT_MM_AUTH_RESP: |
| 332 | case GSM48_MT_MM_IMSI_DETACH_IND: |
| 333 | case GSM48_MT_MM_CM_SERV_REQ: |
Harald Welte | 4b63454 | 2008-12-27 01:55:51 +0000 | [diff] [blame] | 334 | rc = gsm48_rx_mm_serv_req(msg); |
| 335 | break; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 336 | case GSM48_MT_MM_CM_REEST_REQ: |
| 337 | fprintf(stderr, "Unimplemented GSM 04.08 MM msg type 0x%02x\n", |
| 338 | gh->msg_type); |
| 339 | break; |
| 340 | default: |
| 341 | fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n", |
| 342 | gh->msg_type); |
| 343 | break; |
| 344 | } |
| 345 | |
| 346 | return rc; |
| 347 | } |
| 348 | static int gsm0408_rcv_rr(struct msgb *msg) |
| 349 | { |
| 350 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 351 | |
| 352 | switch (gh->msg_type) { |
| 353 | case GSM48_MT_RR_CLSM_CHG: |
| 354 | DEBUGP(DRR, "CLASSMARK CHANGE\n"); |
| 355 | /* FIXME: what to do ?!? */ |
| 356 | break; |
| 357 | case GSM48_MT_RR_PAG_RESP: |
| 358 | default: |
| 359 | fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n", |
| 360 | gh->msg_type); |
| 361 | break; |
| 362 | } |
| 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */ |
| 368 | int gsm0408_rcvmsg(struct msgb *msg) |
| 369 | { |
| 370 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 371 | u_int8_t pdisc = gh->proto_discr & 0x0f; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 372 | int rc = 0; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 373 | |
| 374 | switch (pdisc) { |
| 375 | case GSM48_PDISC_CC: |
| 376 | rc = gsm0408_rcv_cc(msg); |
| 377 | break; |
| 378 | case GSM48_PDISC_MM: |
| 379 | rc = gsm0408_rcv_mm(msg); |
| 380 | break; |
| 381 | case GSM48_PDISC_RR: |
| 382 | rc = gsm0408_rcv_rr(msg); |
| 383 | break; |
| 384 | case GSM48_PDISC_MM_GPRS: |
| 385 | case GSM48_PDISC_SM: |
| 386 | fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n", |
| 387 | pdisc); |
| 388 | break; |
| 389 | default: |
| 390 | fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n", |
| 391 | pdisc); |
| 392 | break; |
| 393 | } |
| 394 | |
| 395 | return rc; |
| 396 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 397 | |
| 398 | enum chreq_type { |
| 399 | CHREQ_T_EMERG_CALL, |
| 400 | CHREQ_T_CALL_REEST_TCH_F, |
| 401 | CHREQ_T_CALL_REEST_TCH_H, |
| 402 | CHREQ_T_CALL_REEST_TCH_H_DBL, |
| 403 | CHREQ_T_SDCCH, |
| 404 | CHREQ_T_TCH_F, |
| 405 | CHREQ_T_VOICE_CALL_TCH_H, |
| 406 | CHREQ_T_DATA_CALL_TCH_H, |
| 407 | CHREQ_T_LOCATION_UPD, |
| 408 | CHREQ_T_PAG_R_ANY, |
| 409 | CHREQ_T_PAG_R_TCH_F, |
| 410 | CHREQ_T_PAG_R_TCH_FH, |
| 411 | }; |
| 412 | |
| 413 | /* Section 9.1.8 / Table 9.9 */ |
| 414 | struct chreq { |
| 415 | u_int8_t val; |
| 416 | u_int8_t mask; |
| 417 | enum chreq_type type; |
| 418 | }; |
| 419 | |
| 420 | /* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */ |
| 421 | static const struct chreq chreq_type_neci1[] = { |
| 422 | { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, |
| 423 | { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F }, |
| 424 | { 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H }, |
| 425 | { 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL }, |
| 426 | { 0xe0, 0xe0, CHREQ_T_SDCCH }, |
| 427 | { 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H }, |
| 428 | { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, |
| 429 | { 0x00, 0xf0, CHREQ_T_LOCATION_UPD }, |
| 430 | { 0x10, 0xf0, CHREQ_T_SDCCH }, |
| 431 | { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, |
| 432 | { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, |
| 433 | { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, |
| 434 | }; |
| 435 | |
| 436 | /* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */ |
| 437 | static const struct chreq chreq_type_neci0[] = { |
| 438 | { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, |
| 439 | { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H }, |
| 440 | { 0xe0, 0xe0, CHREQ_T_TCH_F }, |
| 441 | { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, |
| 442 | { 0x00, 0xe0, CHREQ_T_LOCATION_UPD }, |
| 443 | { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, |
| 444 | { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, |
| 445 | { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, |
| 446 | }; |
| 447 | |
| 448 | static const enum gsm_chan_t ctype_by_chreq[] = { |
| 449 | [CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F, |
| 450 | [CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F, |
| 451 | [CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H, |
| 452 | [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H, |
| 453 | [CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH, |
| 454 | [CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F, |
| 455 | [CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H, |
| 456 | [CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H, |
| 457 | [CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH, |
| 458 | [CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH, |
| 459 | [CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F, |
| 460 | [CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F, |
| 461 | }; |
| 462 | |
| 463 | enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra) |
| 464 | { |
| 465 | int i; |
| 466 | /* FIXME: determine if we set NECI = 0 in the BTS SI4 */ |
| 467 | |
| 468 | for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) { |
| 469 | const struct chreq *chr = &chreq_type_neci0[i]; |
| 470 | if ((ra & chr->mask) == chr->val) |
| 471 | return ctype_by_chreq[chr->type]; |
| 472 | } |
| 473 | fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra); |
| 474 | return GSM_LCHAN_SDCCH; |
| 475 | } |