Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 1 | /* GSM 08.08 like API for OpenBSC. The bridge from MSC to BSC */ |
| 2 | |
| 3 | /* (C) 2010 by Holger Hans Peter Freyther |
Holger Hans Peter Freyther | 85531cc | 2010-10-06 20:37:09 +0800 | [diff] [blame] | 4 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | 2a9285c | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 5 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 22 | * |
| 23 | */ |
| 24 | |
| 25 | #include <openbsc/bsc_api.h> |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 26 | #include <openbsc/bsc_rll.h> |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 27 | #include <openbsc/gsm_data.h> |
| 28 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 29 | #include <openbsc/abis_rsl.h> |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 30 | #include <openbsc/chan_alloc.h> |
Holger Hans Peter Freyther | f2553a6 | 2010-06-30 12:58:14 +0800 | [diff] [blame] | 31 | #include <openbsc/handover.h> |
Holger Hans Peter Freyther | 49ab278 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 32 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 33 | |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 34 | #include <osmocore/protocol/gsm_08_08.h> |
| 35 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 36 | #include <osmocore/talloc.h> |
| 37 | |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 38 | static LLIST_HEAD(sub_connections); |
| 39 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 40 | static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind); |
| 41 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id); |
| 42 | |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 43 | /* GSM 08.08 3.2.2.33 */ |
| 44 | static u_int8_t lchan_to_chosen_channel(struct gsm_lchan *lchan) |
| 45 | { |
| 46 | u_int8_t channel_mode = 0, channel = 0; |
| 47 | |
| 48 | switch (lchan->tch_mode) { |
| 49 | case GSM48_CMODE_SPEECH_V1: |
| 50 | case GSM48_CMODE_SPEECH_EFR: |
| 51 | case GSM48_CMODE_SPEECH_AMR: |
| 52 | channel_mode = 0x9; |
| 53 | break; |
| 54 | case GSM48_CMODE_SIGN: |
| 55 | channel_mode = 0x8; |
| 56 | break; |
| 57 | case GSM48_CMODE_DATA_14k5: |
| 58 | channel_mode = 0xe; |
| 59 | break; |
| 60 | case GSM48_CMODE_DATA_12k0: |
| 61 | channel_mode = 0xb; |
| 62 | break; |
| 63 | case GSM48_CMODE_DATA_6k0: |
| 64 | channel_mode = 0xc; |
| 65 | break; |
| 66 | case GSM48_CMODE_DATA_3k6: |
| 67 | channel_mode = 0xd; |
| 68 | break; |
| 69 | } |
| 70 | |
| 71 | switch (lchan->type) { |
| 72 | case GSM_LCHAN_NONE: |
| 73 | channel = 0x0; |
| 74 | break; |
| 75 | case GSM_LCHAN_SDCCH: |
| 76 | channel = 0x1; |
| 77 | break; |
| 78 | case GSM_LCHAN_TCH_F: |
| 79 | channel = 0x8; |
| 80 | break; |
| 81 | case GSM_LCHAN_TCH_H: |
| 82 | channel = 0x9; |
| 83 | break; |
| 84 | case GSM_LCHAN_UNKNOWN: |
| 85 | LOGP(DMSC, LOGL_ERROR, "Unknown lchan type: %p\n", lchan); |
| 86 | break; |
| 87 | } |
| 88 | |
| 89 | return channel_mode << 4 | channel; |
| 90 | } |
| 91 | |
| 92 | static u_int8_t chan_mode_to_speech(struct gsm_lchan *lchan) |
| 93 | { |
| 94 | int mode = 0; |
| 95 | |
| 96 | switch (lchan->tch_mode) { |
| 97 | case GSM48_CMODE_SPEECH_V1: |
| 98 | mode = 1; |
| 99 | break; |
| 100 | case GSM48_CMODE_SPEECH_EFR: |
| 101 | mode = 0x11; |
| 102 | break; |
| 103 | case GSM48_CMODE_SPEECH_AMR: |
| 104 | mode = 0x21; |
| 105 | break; |
| 106 | case GSM48_CMODE_SIGN: |
| 107 | case GSM48_CMODE_DATA_14k5: |
| 108 | case GSM48_CMODE_DATA_12k0: |
| 109 | case GSM48_CMODE_DATA_6k0: |
| 110 | case GSM48_CMODE_DATA_3k6: |
| 111 | default: |
| 112 | LOGP(DMSC, LOGL_ERROR, "Using non speech mode: %d\n", mode); |
| 113 | return 0; |
| 114 | break; |
| 115 | } |
| 116 | |
| 117 | /* assume to always do AMR HR on any TCH type */ |
| 118 | if (lchan->type == GSM_LCHAN_TCH_H || |
| 119 | lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) |
| 120 | mode |= 0x4; |
| 121 | |
| 122 | return mode; |
| 123 | } |
| 124 | |
| 125 | |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 126 | struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan) |
| 127 | { |
| 128 | struct gsm_subscriber_connection *conn; |
| 129 | |
| 130 | conn = talloc_zero(lchan->ts->trx->bts->network, struct gsm_subscriber_connection); |
| 131 | if (!conn) |
| 132 | return NULL; |
| 133 | |
| 134 | /* Configure the time and start it so it will be closed */ |
| 135 | conn->lchan = lchan; |
| 136 | conn->bts = lchan->ts->trx->bts; |
| 137 | lchan->conn = conn; |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 138 | llist_add_tail(&conn->entry, &sub_connections); |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 139 | return conn; |
| 140 | } |
| 141 | |
| 142 | /* TODO: move subscriber put here... */ |
| 143 | void subscr_con_free(struct gsm_subscriber_connection *conn) |
| 144 | { |
| 145 | struct gsm_lchan *lchan; |
| 146 | |
| 147 | |
| 148 | if (!conn) |
| 149 | return; |
| 150 | |
| 151 | |
| 152 | if (conn->subscr) { |
| 153 | subscr_put(conn->subscr); |
| 154 | conn->subscr = NULL; |
| 155 | } |
| 156 | |
| 157 | |
| 158 | if (conn->ho_lchan) |
| 159 | LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n"); |
| 160 | |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 161 | llist_del(&conn->entry); |
| 162 | |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 163 | lchan = conn->lchan; |
| 164 | talloc_free(conn); |
| 165 | |
| 166 | if (lchan) |
| 167 | lchan->conn = NULL; |
| 168 | } |
| 169 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 170 | int bsc_api_init(struct gsm_network *network, struct bsc_api *api) |
| 171 | { |
| 172 | network->bsc_api = api; |
| 173 | return 0; |
| 174 | } |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 175 | |
| 176 | int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, |
| 177 | struct msgb *msg, int link_id) |
| 178 | { |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 179 | uint8_t sapi = link_id & 0x7; |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 180 | msg->lchan = conn->lchan; |
| 181 | msg->trx = msg->lchan->ts->trx; |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 182 | |
Holger Hans Peter Freyther | f6d0e06 | 2010-06-17 17:48:13 +0800 | [diff] [blame] | 183 | msg->l3h = msg->data; |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 184 | if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) { |
| 185 | OBSC_LINKID_CB(msg) = link_id; |
| 186 | if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) { |
| 187 | msgb_free(msg); |
| 188 | send_sapi_reject(conn, link_id); |
| 189 | return -1; |
| 190 | } |
| 191 | return 0; |
| 192 | } else { |
| 193 | return rsl_data_request(msg, link_id); |
| 194 | } |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 195 | } |
Holger Hans Peter Freyther | 2a9285c | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 196 | |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 197 | /** |
| 198 | * Send a GSM08.08 Assignment Request. Right now this does not contain the |
| 199 | * audio codec type or the allowed rates for the config. |
| 200 | */ |
| 201 | int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_type, int audio) |
| 202 | { |
| 203 | struct bsc_api *api; |
| 204 | api = conn->bts->network->bsc_api; |
| 205 | |
| 206 | api->assign_fail(conn, 0); |
| 207 | return 0; |
| 208 | } |
| 209 | |
Holger Hans Peter Freyther | 7700846 | 2010-06-16 14:10:45 +0800 | [diff] [blame] | 210 | int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len, |
| 211 | uint8_t *mi, int chan_type) |
| 212 | { |
| 213 | return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type); |
| 214 | } |
| 215 | |
Holger Hans Peter Freyther | 2a9285c | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 216 | /* dequeue messages to layer 4 */ |
| 217 | int bsc_upqueue(struct gsm_network *net) |
| 218 | { |
| 219 | struct gsm_mncc *mncc; |
| 220 | struct msgb *msg; |
| 221 | int work = 0; |
| 222 | |
| 223 | if (net) |
| 224 | while ((msg = msgb_dequeue(&net->upqueue))) { |
| 225 | mncc = (struct gsm_mncc *)msg->data; |
| 226 | if (net->mncc_recv) |
| 227 | net->mncc_recv(net, mncc->msg_type, mncc); |
| 228 | work = 1; /* work done */ |
| 229 | talloc_free(msg); |
| 230 | } |
| 231 | |
| 232 | return work; |
| 233 | } |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 234 | |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame^] | 235 | static void dispatch_dtap(struct gsm_subscriber_connection *conn, |
| 236 | uint8_t link_id, struct msgb *msg) |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 237 | { |
| 238 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
| 239 | struct gsm48_hdr *gh; |
| 240 | uint8_t pdisc; |
| 241 | int rc; |
| 242 | |
| 243 | if (msgb_l3len(msg) < sizeof(*gh)) { |
| 244 | LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n"); |
| 245 | return; |
| 246 | } |
| 247 | |
| 248 | gh = msgb_l3(msg); |
| 249 | pdisc = gh->proto_discr & 0x0f; |
| 250 | switch (pdisc) { |
| 251 | case GSM48_PDISC_RR: |
| 252 | switch (gh->msg_type) { |
| 253 | case GSM48_MT_RR_CIPH_M_COMPL: |
| 254 | if (api->cipher_mode_compl) |
| 255 | return api->cipher_mode_compl(conn, msg, |
| 256 | conn->lchan->encr.alg_id); |
| 257 | break; |
| 258 | case GSM48_MT_RR_ASS_COMPL: |
| 259 | LOGP(DMSC, LOGL_ERROR, "Assignment command is not handled.\n"); |
| 260 | break; |
| 261 | case GSM48_MT_RR_ASS_FAIL: |
| 262 | LOGP(DMSC, LOGL_ERROR, "Assignment failure is not handled.\n"); |
| 263 | break; |
| 264 | case GSM48_MT_RR_CHAN_MODE_MODIF_ACK: |
| 265 | rc = gsm48_rx_rr_modif_ack(msg); |
| 266 | if (rc < 0 && api->assign_fail) |
| 267 | api->assign_fail(conn, |
| 268 | GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE); |
| 269 | else if (rc >= 0 && api->assign_compl) |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 270 | api->assign_compl(conn, 0, |
| 271 | lchan_to_chosen_channel(conn->lchan), |
| 272 | conn->lchan->encr.alg_id, |
| 273 | chan_mode_to_speech(conn->lchan)); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 274 | return; |
| 275 | break; |
| 276 | } |
| 277 | break; |
| 278 | case GSM48_PDISC_MM: |
| 279 | break; |
| 280 | } |
| 281 | |
| 282 | /* default case */ |
| 283 | if (api->dtap) |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame^] | 284 | api->dtap(conn, link_id, msg); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 285 | } |
| 286 | |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 287 | int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id) |
| 288 | { |
| 289 | int rc; |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 290 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 291 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 292 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 293 | lchan = msg->lchan; |
Holger Hans Peter Freyther | 49ab278 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 294 | if (lchan->state != LCHAN_S_ACTIVE) { |
| 295 | LOGP(DRSL, LOGL_ERROR, "Got data in non active state. discarding.\n"); |
| 296 | return -1; |
| 297 | } |
| 298 | |
| 299 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 300 | if (lchan->conn) { |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame^] | 301 | dispatch_dtap(lchan->conn, link_id, msg); |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 302 | } else { |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 303 | rc = BSC_API_CONN_POL_REJECT; |
| 304 | lchan->conn = subscr_con_allocate(msg->lchan); |
| 305 | |
| 306 | if (lchan->conn) |
| 307 | rc = api->compl_l3(lchan->conn, msg, 0); |
| 308 | |
| 309 | if (rc != BSC_API_CONN_POL_ACCEPT) { |
| 310 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 311 | lchan_release(lchan, 0, 0); |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 312 | } |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
Holger Hans Peter Freyther | dbc62db | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 318 | int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher, |
| 319 | uint8_t *key, int len) |
| 320 | { |
| 321 | return -1; |
| 322 | } |
| 323 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 324 | /* |
| 325 | * Release all occupied RF Channels but stay around for more. |
| 326 | */ |
Holger Hans Peter Freyther | adb6e1c | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 327 | int gsm0808_clear(struct gsm_subscriber_connection *conn) |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 328 | { |
Holger Hans Peter Freyther | 1f69b46 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 329 | if (conn->ho_lchan) |
| 330 | bsc_clear_handover(conn); |
Holger Hans Peter Freyther | d065165 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 331 | |
Holger Hans Peter Freyther | 1f69b46 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 332 | if (conn->lchan) { |
| 333 | lchan_release(conn->lchan, 1, 0); |
| 334 | conn->lchan->conn = NULL; |
| 335 | } |
| 336 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 337 | conn->lchan = NULL; |
| 338 | conn->ho_lchan = NULL; |
| 339 | conn->bts = NULL; |
| 340 | |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 341 | return 0; |
| 342 | } |
| 343 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 344 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id) |
| 345 | { |
| 346 | struct bsc_api *api; |
| 347 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 348 | if (!conn) |
| 349 | return; |
| 350 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 351 | api = conn->bts->network->bsc_api; |
| 352 | if (!api || !api->sapi_n_reject) |
| 353 | return; |
| 354 | |
| 355 | api->sapi_n_reject(conn, link_id); |
| 356 | } |
| 357 | |
| 358 | static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind) |
| 359 | { |
| 360 | struct msgb *msg = _data; |
| 361 | |
| 362 | switch (rllr_ind) { |
| 363 | case BSC_RLLR_IND_EST_CONF: |
| 364 | rsl_data_request(msg, OBSC_LINKID_CB(msg)); |
| 365 | break; |
| 366 | case BSC_RLLR_IND_REL_IND: |
| 367 | case BSC_RLLR_IND_ERR_IND: |
| 368 | case BSC_RLLR_IND_TIMEOUT: |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 369 | send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg)); |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 370 | msgb_free(msg); |
| 371 | break; |
| 372 | } |
| 373 | } |
| 374 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 375 | static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal, |
| 376 | void *handler_data, void *signal_data) |
| 377 | { |
| 378 | struct bsc_api *bsc; |
| 379 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 380 | struct gsm_subscriber_connection *conn; |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 381 | int destruct = 1; |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 382 | |
| 383 | if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE) |
| 384 | return 0; |
| 385 | |
| 386 | lchan = (struct gsm_lchan *)signal_data; |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 387 | if (!lchan || !lchan->conn) |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 388 | return 0; |
| 389 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 390 | bsc = lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 391 | if (!bsc) |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 392 | return 0; |
| 393 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 394 | conn = lchan->conn; |
| 395 | if (bsc->clear_request) |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 396 | destruct = bsc->clear_request(conn, 0); |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 397 | |
| 398 | /* now give up all channels */ |
| 399 | if (conn->lchan == lchan) |
| 400 | conn->lchan = NULL; |
| 401 | if (conn->ho_lchan == lchan) |
| 402 | conn->ho_lchan = NULL; |
| 403 | gsm0808_clear(conn); |
| 404 | |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 405 | if (destruct) |
| 406 | subscr_con_free(conn); |
| 407 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static __attribute__((constructor)) void on_dso_load_bsc(void) |
| 412 | { |
| 413 | register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL); |
Holger Hans Peter Freyther | 0cfbe26 | 2010-06-15 11:20:24 +0800 | [diff] [blame] | 414 | } |