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> |
| 29 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 30 | #include <openbsc/msgb.h> |
| 31 | #include <openbsc/debug.h> |
| 32 | #include <openbsc/gsm_data.h> |
| 33 | #include <openbsc/gsm_subscriber.h> |
| 34 | #include <openbsc/gsm_04_08.h> |
| 35 | #include <openbsc/abis_rsl.h> |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 36 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 37 | #define GSM48_ALLOC_SIZE 1024 |
| 38 | #define GSM48_ALLOC_HEADROOM 128 |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 39 | |
| 40 | struct gsm_lai { |
| 41 | u_int16_t mcc; |
| 42 | u_int16_t mnc; |
| 43 | u_int16_t lac; |
| 44 | }; |
| 45 | |
| 46 | static void parse_lai(struct gsm_lai *lai, const struct gsm48_loc_area_id *lai48) |
| 47 | { |
| 48 | u_int8_t dig[4]; |
| 49 | |
| 50 | /* MCC */ |
| 51 | dig[1] = lai48->digits[0] & 0x0f; |
| 52 | dig[2] = lai48->digits[0] >> 4; |
| 53 | dig[3] = lai48->digits[1] & 0x0f; |
| 54 | lai->mcc = dig[3] * 100 + dig[2]; |
| 55 | |
| 56 | /* MNC */ |
| 57 | dig[1] = lai48->digits[1] >> 4; |
| 58 | dig[2] = lai48->digits[2] & 0x0f; |
| 59 | dig[3] = lai48->digits[2] >> 4; |
| 60 | lai->mnc = dig[3] * 100 + dig[2]; |
| 61 | |
| 62 | lai->lac = lai48->lac; |
| 63 | } |
| 64 | |
| 65 | static void to_bcd(u_int8_t *bcd, u_int16_t val) |
| 66 | { |
| 67 | bcd[0] = val % 10; |
| 68 | val = val / 10; |
| 69 | bcd[1] = val % 10; |
| 70 | val = val / 10; |
| 71 | bcd[2] = val % 10; |
| 72 | val = val / 10; |
| 73 | } |
| 74 | |
| 75 | static void generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc, |
| 76 | u_int16_t mnc, u_int16_t lac) |
| 77 | { |
| 78 | u_int8_t bcd[3]; |
| 79 | |
| 80 | to_bcd(bcd, mcc); |
| 81 | lai48->digits[0] = bcd[0] | (bcd[1] << 4); |
| 82 | lai48->digits[1] = bcd[2]; |
| 83 | |
| 84 | to_bcd(bcd, mnc); |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 85 | lai48->digits[1] |= bcd[2] << 4; |
| 86 | lai48->digits[2] = bcd[0] | (bcd[1] << 4); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 87 | |
| 88 | lai48->lac = lac; |
| 89 | } |
| 90 | |
| 91 | #define TMSI_LEN 4 |
| 92 | #define MID_TMSI_LEN (TMSI_LEN + 2) |
| 93 | |
| 94 | static void generate_mid_from_tmsi(u_int8_t *buf, u_int8_t *tmsi_bcd) |
| 95 | { |
| 96 | buf[0] = MID_TMSI_LEN; |
| 97 | buf[1] = 0xf0 | GSM_MI_TYPE_TMSI; |
| 98 | buf[2] = tmsi_bcd[0]; |
| 99 | buf[3] = tmsi_bcd[1]; |
| 100 | buf[4] = tmsi_bcd[2]; |
| 101 | buf[5] = tmsi_bcd[3]; |
| 102 | } |
| 103 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 104 | static struct msgb *gsm48_msgb_alloc(void) |
| 105 | { |
| 106 | return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM); |
| 107 | } |
| 108 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 109 | static int gsm0408_sendmsg(struct msgb *msg) |
| 110 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 111 | if (msg->lchan) |
| 112 | msg->trx = msg->lchan->ts->trx; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 113 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 114 | return rsl_data_request(msg, 0); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | static int gsm0408_rcv_cc(struct msgb *msg) |
| 118 | { |
| 119 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 120 | |
| 121 | switch (gh->msg_type & 0xbf) { |
| 122 | case GSM48_MT_CC_CALL_CONF: |
| 123 | /* Response to SETUP */ |
| 124 | DEBUGP(DCC, "CALL CONFIRM\n"); |
| 125 | break; |
| 126 | case GSM48_MT_CC_RELEASE_COMPL: |
| 127 | DEBUGP(DCC, "RELEASE COMPLETE\n"); |
| 128 | break; |
| 129 | case GSM48_MT_CC_ALERTING: |
| 130 | DEBUGP(DCC, "ALERTING\n"); |
| 131 | break; |
| 132 | case GSM48_MT_CC_CONNECT: |
| 133 | DEBUGP(DCC, "CONNECT\n"); |
| 134 | /* need to respond with CONNECT_ACK */ |
| 135 | break; |
| 136 | case GSM48_MT_CC_RELEASE: |
| 137 | DEBUGP(DCC, "RELEASE\n"); |
| 138 | /* need to respond with RELEASE_COMPLETE */ |
| 139 | break; |
| 140 | case GSM48_MT_CC_EMERG_SETUP: |
| 141 | //DEBUGP(DCC, "EMERGENCY SETUP\n"); |
| 142 | case GSM48_MT_CC_SETUP: |
| 143 | //DEBUGP(DCC, "SETUP\n"); |
| 144 | /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */ |
| 145 | default: |
| 146 | fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n", |
| 147 | gh->msg_type); |
| 148 | break; |
| 149 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 150 | |
| 151 | return 0; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /* Chapter 9.2.14 : Send LOCATION UPDATE REJECT */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 155 | 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] | 156 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 157 | struct msgb *msg = gsm48_msgb_alloc(); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 158 | struct gsm48_hdr *gh; |
| 159 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 160 | msg->lchan = lchan; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 161 | |
| 162 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 163 | gh->proto_discr = GSM48_PDISC_MM; |
| 164 | gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; |
| 165 | gh->data[0] = cause; |
| 166 | |
| 167 | DEBUGP(DMM, "-> LOCATION UPDATE REJECT\n"); |
| 168 | |
| 169 | return gsm0408_sendmsg(msg); |
| 170 | } |
| 171 | |
| 172 | /* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 173 | 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] | 174 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 175 | struct gsm_bts *bts = lchan->ts->trx->bts; |
| 176 | struct msgb *msg = gsm48_msgb_alloc(); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 177 | struct gsm48_hdr *gh; |
| 178 | struct gsm48_loc_area_id *lai; |
| 179 | u_int8_t *mid; |
| 180 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 181 | msg->lchan = lchan; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 182 | |
| 183 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 184 | gh->proto_discr = GSM48_PDISC_MM; |
| 185 | gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT; |
| 186 | |
| 187 | lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai)); |
| 188 | generate_lai(lai, bts->network->country_code, |
| 189 | bts->network->network_code, bts->location_area_code); |
| 190 | |
| 191 | mid = msgb_put(msg, MID_TMSI_LEN); |
| 192 | generate_mid_from_tmsi(mid, tmsi); |
| 193 | |
| 194 | DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n"); |
| 195 | |
| 196 | return gsm0408_sendmsg(msg); |
| 197 | } |
| 198 | |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 199 | /* Chapter 9.2.15 */ |
| 200 | static int mm_loc_upd_req(struct msgb *msg) |
| 201 | { |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 202 | struct gsm48_hdr *gh = msgb_l3(msg); |
Harald Welte | 702d870 | 2008-12-26 20:25:35 +0000 | [diff] [blame^] | 203 | struct gsm_bts *bts = msg->trx->bts; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 204 | struct gsm48_loc_upd_req *lu; |
| 205 | struct gsm_subscriber *subscr; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 206 | u_int8_t mi_type; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 207 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 208 | lu = (struct gsm48_loc_upd_req *) gh->data; |
| 209 | |
| 210 | mi_type = lu->mi[0] & GSM_MI_TYPE_MASK; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 211 | |
| 212 | switch (mi_type) { |
| 213 | case GSM_MI_TYPE_IMSI: |
| 214 | /* look up subscriber based on IMSI */ |
| 215 | subscr = subscr_get_by_imsi(&lu->mi[1]); |
| 216 | break; |
| 217 | case GSM_MI_TYPE_TMSI: |
| 218 | /* look up the subscriber based on TMSI, request IMSI if it fails */ |
| 219 | subscr = subscr_get_by_tmsi(&lu->mi[1]); |
| 220 | if (!subscr) { |
| 221 | /* FIXME: send IDENTITY REQUEST message to get IMSI */ |
| 222 | //gsm0408_identity_request(...GSM_MI_TYPE_IMSI); |
| 223 | } |
| 224 | break; |
| 225 | case GSM_MI_TYPE_IMEI: |
| 226 | case GSM_MI_TYPE_IMEISV: |
| 227 | /* no sim card... FIXME: what to do ? */ |
| 228 | fprintf(stderr, "Unimplemented mobile identity type\n"); |
| 229 | break; |
| 230 | default: |
| 231 | fprintf(stderr, "Unknown mobile identity type\n"); |
| 232 | break; |
| 233 | } |
| 234 | |
| 235 | if (!subscr) { |
| 236 | /* 0x16 is congestion */ |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 237 | gsm0408_loc_upd_rej(msg->lchan, 0x16); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 238 | return -EINVAL; |
| 239 | } |
| 240 | |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 241 | msg->lchan->subscr = subscr; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 242 | subscr_update(subscr, bts); |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 243 | |
| 244 | return gsm0408_loc_upd_acc(msg->lchan, subscr->tmsi); |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static int gsm0408_rcv_mm(struct msgb *msg) |
| 248 | { |
| 249 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 250 | int rc; |
| 251 | |
| 252 | switch (gh->msg_type & 0xbf) { |
| 253 | case GSM48_MT_MM_LOC_UPD_REQUEST: |
| 254 | DEBUGP(DMM, "LOCATION UPDATE REQUEST\n"); |
| 255 | rc = mm_loc_upd_req(msg); |
| 256 | break; |
| 257 | case GSM48_MT_MM_ID_RESP: |
| 258 | case GSM48_MT_MM_TMSI_REALL_COMPL: |
| 259 | case GSM48_MT_MM_AUTH_RESP: |
| 260 | case GSM48_MT_MM_IMSI_DETACH_IND: |
| 261 | case GSM48_MT_MM_CM_SERV_REQ: |
| 262 | case GSM48_MT_MM_CM_REEST_REQ: |
| 263 | fprintf(stderr, "Unimplemented GSM 04.08 MM msg type 0x%02x\n", |
| 264 | gh->msg_type); |
| 265 | break; |
| 266 | default: |
| 267 | fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n", |
| 268 | gh->msg_type); |
| 269 | break; |
| 270 | } |
| 271 | |
| 272 | return rc; |
| 273 | } |
| 274 | static int gsm0408_rcv_rr(struct msgb *msg) |
| 275 | { |
| 276 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 277 | |
| 278 | switch (gh->msg_type) { |
| 279 | case GSM48_MT_RR_CLSM_CHG: |
| 280 | DEBUGP(DRR, "CLASSMARK CHANGE\n"); |
| 281 | /* FIXME: what to do ?!? */ |
| 282 | break; |
| 283 | case GSM48_MT_RR_PAG_RESP: |
| 284 | default: |
| 285 | fprintf(stderr, "Unimplemented GSM 04.08 msg type 0x%02x\n", |
| 286 | gh->msg_type); |
| 287 | break; |
| 288 | } |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | /* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */ |
| 294 | int gsm0408_rcvmsg(struct msgb *msg) |
| 295 | { |
| 296 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 297 | u_int8_t pdisc = gh->proto_discr & 0x0f; |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 298 | int rc = 0; |
Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 299 | |
| 300 | switch (pdisc) { |
| 301 | case GSM48_PDISC_CC: |
| 302 | rc = gsm0408_rcv_cc(msg); |
| 303 | break; |
| 304 | case GSM48_PDISC_MM: |
| 305 | rc = gsm0408_rcv_mm(msg); |
| 306 | break; |
| 307 | case GSM48_PDISC_RR: |
| 308 | rc = gsm0408_rcv_rr(msg); |
| 309 | break; |
| 310 | case GSM48_PDISC_MM_GPRS: |
| 311 | case GSM48_PDISC_SM: |
| 312 | fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n", |
| 313 | pdisc); |
| 314 | break; |
| 315 | default: |
| 316 | fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n", |
| 317 | pdisc); |
| 318 | break; |
| 319 | } |
| 320 | |
| 321 | return rc; |
| 322 | } |
Harald Welte | 8470bf2 | 2008-12-25 23:28:35 +0000 | [diff] [blame] | 323 | |
| 324 | enum chreq_type { |
| 325 | CHREQ_T_EMERG_CALL, |
| 326 | CHREQ_T_CALL_REEST_TCH_F, |
| 327 | CHREQ_T_CALL_REEST_TCH_H, |
| 328 | CHREQ_T_CALL_REEST_TCH_H_DBL, |
| 329 | CHREQ_T_SDCCH, |
| 330 | CHREQ_T_TCH_F, |
| 331 | CHREQ_T_VOICE_CALL_TCH_H, |
| 332 | CHREQ_T_DATA_CALL_TCH_H, |
| 333 | CHREQ_T_LOCATION_UPD, |
| 334 | CHREQ_T_PAG_R_ANY, |
| 335 | CHREQ_T_PAG_R_TCH_F, |
| 336 | CHREQ_T_PAG_R_TCH_FH, |
| 337 | }; |
| 338 | |
| 339 | /* Section 9.1.8 / Table 9.9 */ |
| 340 | struct chreq { |
| 341 | u_int8_t val; |
| 342 | u_int8_t mask; |
| 343 | enum chreq_type type; |
| 344 | }; |
| 345 | |
| 346 | /* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */ |
| 347 | static const struct chreq chreq_type_neci1[] = { |
| 348 | { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, |
| 349 | { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F }, |
| 350 | { 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H }, |
| 351 | { 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL }, |
| 352 | { 0xe0, 0xe0, CHREQ_T_SDCCH }, |
| 353 | { 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H }, |
| 354 | { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, |
| 355 | { 0x00, 0xf0, CHREQ_T_LOCATION_UPD }, |
| 356 | { 0x10, 0xf0, CHREQ_T_SDCCH }, |
| 357 | { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, |
| 358 | { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, |
| 359 | { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, |
| 360 | }; |
| 361 | |
| 362 | /* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */ |
| 363 | static const struct chreq chreq_type_neci0[] = { |
| 364 | { 0xa0, 0xe0, CHREQ_T_EMERG_CALL }, |
| 365 | { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H }, |
| 366 | { 0xe0, 0xe0, CHREQ_T_TCH_F }, |
| 367 | { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H }, |
| 368 | { 0x00, 0xe0, CHREQ_T_LOCATION_UPD }, |
| 369 | { 0x80, 0xe0, CHREQ_T_PAG_R_ANY }, |
| 370 | { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F }, |
| 371 | { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH }, |
| 372 | }; |
| 373 | |
| 374 | static const enum gsm_chan_t ctype_by_chreq[] = { |
| 375 | [CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F, |
| 376 | [CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F, |
| 377 | [CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H, |
| 378 | [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H, |
| 379 | [CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH, |
| 380 | [CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F, |
| 381 | [CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H, |
| 382 | [CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H, |
| 383 | [CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH, |
| 384 | [CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH, |
| 385 | [CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F, |
| 386 | [CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F, |
| 387 | }; |
| 388 | |
| 389 | enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra) |
| 390 | { |
| 391 | int i; |
| 392 | /* FIXME: determine if we set NECI = 0 in the BTS SI4 */ |
| 393 | |
| 394 | for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) { |
| 395 | const struct chreq *chr = &chreq_type_neci0[i]; |
| 396 | if ((ra & chr->mask) == chr->val) |
| 397 | return ctype_by_chreq[chr->type]; |
| 398 | } |
| 399 | fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra); |
| 400 | return GSM_LCHAN_SDCCH; |
| 401 | } |