Harald Welte | 52b1f98 | 2008-12-23 20:25:15 +0000 | [diff] [blame] | 1 | /* GSM Radio Signalling Link messages on the A-bis interface |
| 2 | * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */ |
| 3 | |
| 4 | /* (C) 2008 by Harald Welte <laforge@gnumonks.org> |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <errno.h> |
| 25 | #include <sys/types.h> |
| 26 | |
| 27 | #include "gsm_data.h" |
| 28 | #include "gsm_04_08.h" |
| 29 | #include "abis_rsl.h" |
| 30 | #include "debug.h" |
| 31 | #include "tlv.h" |
| 32 | |
| 33 | #define RSL_ALLOC_SIZE 1024 |
| 34 | |
| 35 | static u_int8_t mdisc_by_msgtype(u_int8_t msg_type) |
| 36 | { |
| 37 | /* mask off the transparent bit ? */ |
| 38 | msg_type &= 0xfe; |
| 39 | |
| 40 | if (msg_type & 0xf0 == 0x00) |
| 41 | return ABIS_RSL_MDISC_RLL; |
| 42 | if (msg_type & 0xf0 == 0x10) { |
| 43 | if (msg_type >= 0x19 && msg_type <= 0x22) |
| 44 | return ABIS_RSL_MDISC_TRX; |
| 45 | else |
| 46 | return ABIS_RSL_MDISC_COM_CHAN; |
| 47 | } |
| 48 | if (msg_type & 0xc == 0x00) |
| 49 | return ABIS_RSL_MDISC_DED_CHAN; |
| 50 | |
| 51 | return ABIS_RSL_MDISC_LOC; |
| 52 | } |
| 53 | |
| 54 | static inline void init_dchan_hdr(struct abis_rsl_dchan_hdr *dh, |
| 55 | u_int8_t msg_type) |
| 56 | { |
| 57 | dh->c.msg_discr = mdisc_by_msgtype(msg_type); |
| 58 | dh->c.msg_type = msg_type; |
| 59 | dh->ie_chan = RSL_IE_CHAN_NR; |
| 60 | } |
| 61 | |
| 62 | static inline void init_llm_hdr(struct abis_rsl_rll_hdr *dh, |
| 63 | u_int8_t msg_type) |
| 64 | { |
| 65 | /* dh->c.msg_discr = mdisc_by_msgtype(msg_type); */ |
| 66 | dh->c.msg_discr = ABIS_RSL_MDISC_RLL; |
| 67 | dh->c.msg_type = msg_type; |
| 68 | dh->ie_chan = RSL_IE_CHAN_NR; |
| 69 | dh->ie_link_id = RSL_IE_LINK_IDENT; |
| 70 | } |
| 71 | |
| 72 | |
| 73 | /* encode channel number as per Section 9.3.1 */ |
| 74 | u_int8_t rsl_enc_chan_nr(u_int8_t type, u_int8_t subch, u_int8_t timeslot) |
| 75 | { |
| 76 | u_int8_t ret; |
| 77 | |
| 78 | ret = (timeslot & 0x07) | type; |
| 79 | |
| 80 | switch (type) { |
| 81 | case RSL_CHAN_Lm_ACCHs: |
| 82 | subch &= 0x01; |
| 83 | break; |
| 84 | case RSL_CHAN_SDCCH4_ACCH: |
| 85 | subch &= 0x07; |
| 86 | break; |
| 87 | case RSL_CHAN_SDCCH8_ACCH: |
| 88 | subch &= 0x07; |
| 89 | break; |
| 90 | default: |
| 91 | /* no subchannels allowed */ |
| 92 | subch = 0x00; |
| 93 | break; |
| 94 | } |
| 95 | ret |= (subch << 3); |
| 96 | |
| 97 | return ret; |
| 98 | } |
| 99 | |
| 100 | /* As per TS 03.03 Section 2.2, the IMSI has 'not more than 15 digits' */ |
| 101 | u_int64_t str_to_imsi(const char *imsi_str) |
| 102 | { |
| 103 | u_int64_t ret; |
| 104 | |
| 105 | ret = strtoull(imsi_str, NULL, 10); |
| 106 | |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | /* Table 5 Clause 7 TS 05.02 */ |
| 111 | unsigned int n_pag_blocks(int bs_ccch_sdcch_comb, unsigned int bs_ag_blks_res) |
| 112 | { |
| 113 | if (!bs_ccch_sdcch_comb) |
| 114 | return 9 - bs_ag_blks_res; |
| 115 | else |
| 116 | return 3 - bs_ag_blks_res; |
| 117 | } |
| 118 | |
| 119 | /* Chapter 6.5.2 of TS 05.02 */ |
| 120 | unsigned int get_ccch_group(u_int64_t imsi, unsigned int bs_cc_chans, |
| 121 | unsigned int n_pag_blocks) |
| 122 | { |
| 123 | return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks; |
| 124 | } |
| 125 | |
| 126 | /* Chapter 6.5.2 of TS 05.02 */ |
| 127 | unsigned int get_paging_group(u_int64_t imsi, unsigned int bs_cc_chans, |
| 128 | int n_pag_blocks) |
| 129 | { |
| 130 | return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks; |
| 131 | } |
| 132 | |
| 133 | /* Send a BCCH_INFO message as per Chapter 8.5.1 */ |
| 134 | int rsl_bcch_info(struct gsm_bts *bts, u_int8_t type, |
| 135 | const u_int8_t *data, int len) |
| 136 | { |
| 137 | struct abis_rsl_dchan_hdr *dh; |
| 138 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 139 | |
| 140 | dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof*dh); |
| 141 | init_dchan_hdr(dh, RSL_MT_BCCH_INFO); |
| 142 | dh->chan_nr = RSL_CHAN_BCCH; |
| 143 | |
| 144 | msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type); |
| 145 | msgb_tlv_put(msg, RSL_IE_FULL_BCCH_INFO, len, data); |
| 146 | |
| 147 | return abis_rsl_sendmsg(bts, msg); |
| 148 | } |
| 149 | |
| 150 | int rsl_sacch_filling(struct gsm_bts *bts, u_int8_t type, |
| 151 | const u_int8_t *data, int len) |
| 152 | { |
| 153 | struct abis_rsl_common_hdr *ch; |
| 154 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 155 | |
| 156 | ch = (struct abis_rsl_common_hdr *) msgb_put(msg, sizeof(*ch)); |
| 157 | ch->msg_discr = ABIS_RSL_MDISC_TRX; |
| 158 | ch->msg_type = RSL_MT_SACCH_FILL; |
| 159 | |
| 160 | msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type); |
| 161 | msgb_tlv_put(msg, RSL_IE_L3_INFO, len, data); |
| 162 | |
| 163 | return abis_rsl_sendmsg(bts, msg); |
| 164 | } |
| 165 | |
| 166 | /* Chapter 8.4.1 */ |
| 167 | int rsl_chan_activate(struct gsm_bts *bts, u_int8_t chan_nr, |
| 168 | u_int8_t act_type, |
| 169 | struct rsl_ie_chan_mode *chan_mode, |
| 170 | struct rsl_ie_chan_ident *chan_ident, |
| 171 | u_int8_t bs_power, u_int8_t ms_power, |
| 172 | u_int8_t ta) |
| 173 | { |
| 174 | struct abis_rsl_dchan_hdr *dh; |
| 175 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 176 | u_int8_t encr_info = 0x01; |
| 177 | |
| 178 | dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| 179 | init_dchan_hdr(dh, RSL_MT_CHAN_ACTIV); |
| 180 | dh->chan_nr = chan_nr; |
| 181 | |
| 182 | msgb_tv_put(msg, RSL_IE_ACT_TYPE, act_type); |
| 183 | /* For compatibility with Phase 1 */ |
| 184 | msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(*chan_mode), |
| 185 | (u_int8_t *) chan_mode); |
| 186 | msgb_tlv_put(msg, RSL_IE_CHAN_IDENT, 4, |
| 187 | (u_int8_t *) &chan_ident); |
| 188 | /* FIXME: this shoould be optional */ |
| 189 | msgb_tlv_put(msg, RSL_IE_ENCR_INFO, 1, |
| 190 | (u_int8_t *) &encr_info); |
| 191 | msgb_tv_put(msg, RSL_IE_BS_POWER, bs_power); |
| 192 | msgb_tv_put(msg, RSL_IE_MS_POWER, ms_power); |
| 193 | msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta); |
| 194 | |
| 195 | return abis_rsl_sendmsg(bts, msg); |
| 196 | } |
| 197 | |
| 198 | #define TSC 7 |
| 199 | |
| 200 | int rsl_chan_activate_tch_f(struct gsm_bts_trx_ts *ts) |
| 201 | { |
| 202 | u_int8_t chan_nr = rsl_enc_chan_nr(RSL_CHAN_Bm_ACCHs, 0, ts->nr); |
| 203 | u_int16_t arfcn = ts->trx->arfcn; |
| 204 | struct rsl_ie_chan_mode cm; |
| 205 | struct rsl_ie_chan_ident ci; |
| 206 | |
| 207 | cm.dtx_dtu = 0; |
| 208 | cm.spd_ind = RSL_CMOD_SPD_SPEECH; |
| 209 | cm.chan_rt = RSL_CMOD_CRT_TCH_Bm; |
| 210 | cm.chan_rate = RSL_CMOD_SP_GSM1; |
| 211 | |
| 212 | ci.chan_desc.iei = 0x64; |
| 213 | ci.chan_desc.chan_nr = chan_nr; |
| 214 | /* FIXME: this doesn't support hopping */ |
| 215 | ci.chan_desc.oct3 = (TSC << 5) | ((arfcn & 0x3ff) >> 8); |
| 216 | ci.chan_desc.oct4 = arfcn & 0xff; |
| 217 | #if 0 |
| 218 | ci.mobile_alloc.tag = 0x72; |
| 219 | ci.mobile_alloc.len = 0; /* as per Section 9.3.5 */ |
| 220 | #endif |
| 221 | |
| 222 | return rsl_chan_activate(ts->trx->bts, chan_nr, 0x01, &cm, &ci, 0x01, 0x0f, 0x00); |
| 223 | } |
| 224 | |
| 225 | int rsl_chan_activate_sdcch(struct gsm_bts_trx_ts *ts) |
| 226 | { |
| 227 | u_int8_t chan_nr = rsl_enc_chan_nr(RSL_CHAN_SDCCH4_ACCH, 0, ts->nr); |
| 228 | u_int16_t arfcn = ts->trx->arfcn; |
| 229 | struct rsl_ie_chan_mode cm; |
| 230 | struct rsl_ie_chan_ident ci; |
| 231 | |
| 232 | cm.dtx_dtu = 0x00; |
| 233 | cm.spd_ind = RSL_CMOD_SPD_SIGN; |
| 234 | cm.chan_rt = RSL_CMOD_CRT_SDCCH; |
| 235 | cm.chan_rate = 0x00; |
| 236 | |
| 237 | ci.chan_desc.iei = 0x64; |
| 238 | ci.chan_desc.chan_nr = chan_nr; |
| 239 | ci.chan_desc.oct3 = (TSC << 5) | ((arfcn & 0x3ff) >> 8); |
| 240 | ci.chan_desc.oct4 = arfcn & 0xff; |
| 241 | |
| 242 | /* FIXME: we're sending BS power IE, whcih Abissim doesn't */ |
| 243 | return rsl_chan_activate(ts->trx->bts, chan_nr, 0x00, &cm, &ci, 0x01, 0x0f, 0x00); |
| 244 | } |
| 245 | |
| 246 | int rsl_chan_release(struct gsm_bts_trx_ts *ts, u_int8_t chan_nr) |
| 247 | { |
| 248 | struct abis_rsl_dchan_hdr *dh; |
| 249 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 250 | |
| 251 | dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| 252 | init_dchan_hdr(dh, RSL_MT_RF_CHAN_REL); |
| 253 | dh->chan_nr = chan_nr; |
| 254 | |
| 255 | return abis_rsl_sendmsg(ts->trx->bts, msg); |
| 256 | } |
| 257 | |
| 258 | int rsl_paging_cmd(struct gsm_bts *bts, u_int8_t paging_group, u_int8_t len, |
| 259 | u_int8_t *ms_ident, u_int8_t chan_needed) |
| 260 | { |
| 261 | struct abis_rsl_dchan_hdr *dh; |
| 262 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 263 | |
| 264 | dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| 265 | init_dchan_hdr(dh, RSL_MT_PAGING_CMD); |
| 266 | dh->chan_nr = RSL_CHAN_PCH_AGCH; |
| 267 | |
| 268 | msgb_tv_put(msg, RSL_IE_PAGING_GROUP, paging_group); |
| 269 | msgb_tlv_put(msg, RSL_IE_MS_IDENTITY, len, ms_ident); |
| 270 | msgb_tv_put(msg, RSL_IE_CHAN_NEEDED, chan_needed); |
| 271 | |
| 272 | return abis_rsl_sendmsg(bts, msg); |
| 273 | } |
| 274 | |
| 275 | int imsi_str2bcd(u_int8_t *bcd_out, const char *str_in) |
| 276 | { |
| 277 | int i, len = strlen(str_in); |
| 278 | |
| 279 | for (i = 0; i < len; i++) { |
| 280 | int num = str_in[i] - 0x30; |
| 281 | if (num < 0 || num > 9) |
| 282 | return -1; |
| 283 | if (i % 2 == 0) |
| 284 | bcd_out[i/2] = num; |
| 285 | else |
| 286 | bcd_out[i/2] |= (num << 4); |
| 287 | } |
| 288 | |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | # if 0 |
| 293 | int rsl_paging_cmd_imsi(struct gsm_bts *bts, u_int8_t chan_needed, const char *imsi_str) |
| 294 | { |
| 295 | /* FIXME: derive the MS Identity */ |
| 296 | return rsl_paging_cmd(bts, paging_group, x, y, chan_needed); |
| 297 | } |
| 298 | #endif |
| 299 | |
| 300 | int rsl_imm_assign_cmd(struct gsm_bts *bts, u_int8_t len, u_int8_t *val) |
| 301 | { |
| 302 | struct msgb *msg = msgb_alloc(RSL_ALLOC_SIZE); |
| 303 | struct abis_rsl_dchan_hdr *dh; |
| 304 | |
| 305 | dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh)); |
| 306 | init_dchan_hdr(dh, RSL_MT_IMMEDIATE_ASSIGN_CMD); |
| 307 | dh->chan_nr = RSL_CHAN_PCH_AGCH; |
| 308 | |
| 309 | /* If phase 2, FULL_IMM_ASS_INFO */ |
| 310 | |
| 311 | msgb_tlv_put(msg, RSL_IE_IMM_ASS_INFO, len, val); |
| 312 | |
| 313 | return abis_rsl_sendmsg(bts, msg); |
| 314 | } |
| 315 | |
| 316 | /* Chapter 8.3.1 */ |
| 317 | int rsl_data_request(struct gsm_bts *bts, struct msgb *msg) |
| 318 | { |
| 319 | /* FIXME: prepend RSL header to layer 3 message */ |
| 320 | u_int8_t len = msg->len; |
| 321 | struct abis_rsl_rll_hdr *rh; |
| 322 | |
| 323 | msgb_tv_push(msg, RSL_IE_L3_INFO, len); |
| 324 | |
| 325 | rh = (struct abis_rsl_rll_hdr *) msgb_push(msg, sizeof(*rh)); |
| 326 | init_llm_hdr(rh, RSL_MT_DATA_REQ); |
| 327 | rh->chan_nr = RSL_CHAN_SDCCH4_ACCH; /* FIXME: don't harcode */ |
| 328 | |
| 329 | return abis_rsl_sendmsg(bts, msg); |
| 330 | } |
| 331 | |
| 332 | static int abis_rsl_rx_dchan(struct msgb *msg) |
| 333 | { |
| 334 | struct abis_rsl_common_hdr *rslh = msgb_l2(msg) ; |
| 335 | |
| 336 | switch (rslh->msg_type) { |
| 337 | case RSL_MT_CHAN_ACTIV_ACK: |
| 338 | case RSL_MT_CHAN_ACTIV_NACK: |
| 339 | case RSL_MT_CONN_FAIL: |
| 340 | case RSL_MT_MEAS_RES: |
| 341 | case RSL_MT_MODE_MODIFY_ACK: |
| 342 | case RSL_MT_MODE_MODIFY_NACK: |
| 343 | case RSL_MT_PHY_CONTEXT_CONF: |
| 344 | case RSL_MT_PREPROC_MEAS_RES: |
| 345 | case RSL_MT_RF_CHAN_REL_ACK: |
| 346 | case RSL_MT_TALKER_DET: |
| 347 | case RSL_MT_LISTENER_DET: |
| 348 | case RSL_MT_REMOTE_CODEC_CONF_REP: |
| 349 | case RSL_MT_MR_CODEC_MOD_ACK: |
| 350 | case RSL_MT_MR_CODEC_MOD_NACK: |
| 351 | case RSL_MT_MR_CODEC_MOD_PER: |
| 352 | fprintf(stderr, "Unimplemented Abis RSL DChan msg 0x%02x\n", |
| 353 | rslh->msg_type); |
| 354 | break; |
| 355 | default: |
| 356 | fprintf(stderr, "unknown Abis RSL DChan msg 0x%02x\n", |
| 357 | rslh->msg_type); |
| 358 | return -EINVAL; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | static int abis_rsl_rx_trx(struct msgb *msg) |
| 363 | { |
| 364 | struct abis_rsl_common_hdr *rslh = msgb_l2(msg) ; |
| 365 | |
| 366 | switch (rslh->msg_type) { |
| 367 | case RSL_MT_RF_RES_IND: |
| 368 | /* interference on idle channels of TRX */ |
| 369 | case RSL_MT_OVERLOAD: |
| 370 | /* indicate CCCH / ACCH / processor overload */ |
| 371 | case RSL_MT_ERROR_REPORT: |
| 372 | fprintf(stderr, "Unimplemented Abis RSL TRX message type 0x%02x\n", |
| 373 | rslh->msg_type); |
| 374 | break; |
| 375 | default: |
| 376 | fprintf(stderr, "Unknown Abis RSL TRX message type 0x%02x\n", |
| 377 | rslh->msg_type); |
| 378 | return -EINVAL; |
| 379 | } |
| 380 | |
| 381 | } |
| 382 | |
| 383 | static int rsl_rx_chan_rqd(struct msgb *msg) |
| 384 | { |
| 385 | struct gsm_bts *bts = msg->bts_link->bts; |
| 386 | struct gsm48_imm_ass ia; |
| 387 | u_int16_t arfcn; |
| 388 | u_int8_t ts_number, subch; |
| 389 | |
| 390 | /* MS has requested a channel on the RACH */ |
| 391 | /* parse channel number, request reference, access delay */ |
| 392 | /* FIXME: check permission/availability */ |
| 393 | ts_number = 0; |
| 394 | arfcn = HARDCODED_ARFCN; |
| 395 | subch = 0; |
| 396 | |
| 397 | /* send CHANNEL ACTIVATION on RSL to BTS */ |
| 398 | rsl_chan_activate_sdcch(&bts->trx[0].ts[ts_number]); |
| 399 | |
| 400 | /* create IMMEDIATE ASSIGN 04.08 messge */ |
| 401 | memset(&ia, 0, sizeof(ia)); |
| 402 | ia.l2_plen = 0x2d; |
| 403 | ia.proto_discr = GSM48_PDISC_RR; |
| 404 | ia.msg_type = GSM48_MT_RR_IMM_ASS; |
| 405 | ia.page_mode = GSM48_PM_NORMAL; |
| 406 | ia.chan_desc.chan_nr = rsl_enc_chan_nr(RSL_CHAN_SDCCH4_ACCH, subch, ts_number); |
| 407 | ia.chan_desc.h0.h = 0; |
| 408 | ia.chan_desc.h0.arfcn_high = arfcn >> 8; |
| 409 | ia.chan_desc.h0.arfcn_low = arfcn & 0xff; |
| 410 | ia.chan_desc.h0.tsc = 7; |
| 411 | /* FIXME: use real request reference extracted from CHAN_RQD */ |
| 412 | ia.req_ref.ra = 0x80 | 0x1e; |
| 413 | ia.req_ref.t2 = 0x0c; |
| 414 | ia.req_ref.t1_ = 0x12; |
| 415 | ia.req_ref.t3_low = 0x19 & 3; |
| 416 | ia.req_ref.t3_high = 0x19 >> 3; |
| 417 | ia.timing_advance = 0; |
| 418 | ia.mob_alloc_len = 0; |
| 419 | |
| 420 | /* send IMMEDIATE ASSIGN CMD on RSL to BTS (to send on CCCH to MS) */ |
| 421 | return rsl_imm_assign_cmd(bts, sizeof(ia), (u_int8_t *) &ia); |
| 422 | } |
| 423 | |
| 424 | static int abis_rsl_rx_cchan(struct msgb *msg) |
| 425 | { |
| 426 | struct abis_rsl_common_hdr *rslh = msgb_l2(msg) ; |
| 427 | int rc; |
| 428 | |
| 429 | switch (rslh->msg_type) { |
| 430 | case RSL_MT_CHAN_RQD: |
| 431 | /* MS has requested a channel on the RACH */ |
| 432 | rc = rsl_rx_chan_rqd(msg); |
| 433 | break; |
| 434 | case RSL_MT_DELETE_IND: |
| 435 | /* CCCH overloaded, IMM_ASSIGN was dropped */ |
| 436 | case RSL_MT_CBCH_LOAD_IND: |
| 437 | /* current load on the CBCH */ |
| 438 | case RSL_MT_CCCH_LOAD_IND: |
| 439 | /* current load on the CCCH */ |
| 440 | fprintf(stderr, "Unimplemented Abis RSL TRX message type 0x%02x\n", |
| 441 | rslh->msg_type); |
| 442 | break; |
| 443 | default: |
| 444 | fprintf(stderr, "Unknown Abis RSL TRX message type 0x%02x\n", |
| 445 | rslh->msg_type); |
| 446 | return -EINVAL; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* ESTABLISH INDICATION, LOCATION AREA UPDATE REQUEST |
| 451 | 0x02, 0x06, |
| 452 | 0x01, 0x20, |
| 453 | 0x02, 0x00, |
| 454 | 0x0b, 0x00, 0x0f, 0x05, 0x08, ... */ |
| 455 | |
| 456 | static int abis_rsl_rx_rll(struct msgb *msg) |
| 457 | { |
| 458 | struct abis_rsl_rll_hdr *rllh = msgb_l2(msg); |
| 459 | int rc; |
| 460 | |
| 461 | switch (rllh->c.msg_type) { |
| 462 | case RSL_MT_DATA_IND: |
| 463 | DEBUGP(DRLL, "DATA INDICATION\n"); |
| 464 | /* FIXME: parse L3 info element */ |
| 465 | rc = gsm0408_rcvmsg(msg); |
| 466 | break; |
| 467 | case RSL_MT_EST_IND: |
| 468 | DEBUGP(DRLL, "ESTABLISH INDICATION\n"); |
| 469 | /* FIXME: parse L3 info element */ |
| 470 | rc = gsm0408_rcvmsg(msg); |
| 471 | break; |
| 472 | case RSL_MT_ERROR_IND: |
| 473 | case RSL_MT_REL_IND: |
| 474 | case RSL_MT_UNIT_DATA_IND: |
| 475 | fprintf(stderr, "unimplemented Abis RLL message type 0x%02x\n", |
| 476 | rllh->c.msg_type); |
| 477 | break; |
| 478 | default: |
| 479 | fprintf(stderr, "unknown Abis RLL message type 0x%02x\n", |
| 480 | rllh->c.msg_type); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | /* Entry-point where L2 RSL from BTS enters */ |
| 485 | int abis_rsl_rx(struct msgb *msg) |
| 486 | { |
| 487 | struct abis_rsl_common_hdr *rslh = msgb_l2(msg) ; |
| 488 | unsigned int l2_len = (void *)msg->tail - msgb_l2(msg); |
| 489 | int rc; |
| 490 | |
| 491 | switch (rslh->msg_discr & 0xfe) { |
| 492 | case ABIS_RSL_MDISC_RLL: |
| 493 | rc = abis_rsl_rx_rll(msg); |
| 494 | break; |
| 495 | case ABIS_RSL_MDISC_DED_CHAN: |
| 496 | rc = abis_rsl_rx_dchan(msg); |
| 497 | break; |
| 498 | case ABIS_RSL_MDISC_COM_CHAN: |
| 499 | case ABIS_RSL_MDISC_TRX: |
| 500 | rc = abis_rsl_rx_cchan(msg); |
| 501 | break; |
| 502 | case ABIS_RSL_MDISC_LOC: |
| 503 | default: |
| 504 | fprintf(stderr, "unknown RSL message discriminator 0x%02x\n", |
| 505 | rslh->msg_discr); |
| 506 | return -EINVAL; |
| 507 | } |
| 508 | } |