Holger Hans Peter Freyther | 7cdff24 | 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 | 5180844 | 2010-10-06 20:37:09 +0800 | [diff] [blame] | 4 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 5 | * (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 7cdff24 | 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 | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 26 | #include <openbsc/bsc_rll.h> |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 27 | #include <openbsc/gsm_data.h> |
| 28 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 29 | #include <openbsc/abis_rsl.h> |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 30 | #include <openbsc/chan_alloc.h> |
Holger Hans Peter Freyther | df5f724 | 2010-06-30 12:58:14 +0800 | [diff] [blame] | 31 | #include <openbsc/handover.h> |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 32 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 33 | |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 34 | #include <osmocore/protocol/gsm_08_08.h> |
| 35 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 36 | #include <osmocore/talloc.h> |
| 37 | |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 38 | static LLIST_HEAD(sub_connections); |
| 39 | |
Holger Hans Peter Freyther | ee2be4c | 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 | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 43 | struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan) |
| 44 | { |
| 45 | struct gsm_subscriber_connection *conn; |
| 46 | |
| 47 | conn = talloc_zero(lchan->ts->trx->bts->network, struct gsm_subscriber_connection); |
| 48 | if (!conn) |
| 49 | return NULL; |
| 50 | |
| 51 | /* Configure the time and start it so it will be closed */ |
| 52 | conn->lchan = lchan; |
| 53 | conn->bts = lchan->ts->trx->bts; |
| 54 | lchan->conn = conn; |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 55 | llist_add_tail(&conn->entry, &sub_connections); |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 56 | return conn; |
| 57 | } |
| 58 | |
| 59 | /* TODO: move subscriber put here... */ |
| 60 | void subscr_con_free(struct gsm_subscriber_connection *conn) |
| 61 | { |
| 62 | struct gsm_lchan *lchan; |
| 63 | |
| 64 | |
| 65 | if (!conn) |
| 66 | return; |
| 67 | |
| 68 | |
| 69 | if (conn->subscr) { |
| 70 | subscr_put(conn->subscr); |
| 71 | conn->subscr = NULL; |
| 72 | } |
| 73 | |
| 74 | |
| 75 | if (conn->ho_lchan) |
| 76 | LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n"); |
| 77 | |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 78 | llist_del(&conn->entry); |
| 79 | |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 80 | lchan = conn->lchan; |
| 81 | talloc_free(conn); |
| 82 | |
| 83 | if (lchan) |
| 84 | lchan->conn = NULL; |
| 85 | } |
| 86 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 87 | int bsc_api_init(struct gsm_network *network, struct bsc_api *api) |
| 88 | { |
| 89 | network->bsc_api = api; |
| 90 | return 0; |
| 91 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 92 | |
| 93 | int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, |
| 94 | struct msgb *msg, int link_id) |
| 95 | { |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 96 | uint8_t sapi = link_id & 0x7; |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 97 | msg->lchan = conn->lchan; |
| 98 | msg->trx = msg->lchan->ts->trx; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 99 | |
Holger Hans Peter Freyther | a76bcb0 | 2010-06-17 17:48:13 +0800 | [diff] [blame] | 100 | msg->l3h = msg->data; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 101 | if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) { |
| 102 | OBSC_LINKID_CB(msg) = link_id; |
| 103 | if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) { |
| 104 | msgb_free(msg); |
| 105 | send_sapi_reject(conn, link_id); |
| 106 | return -1; |
| 107 | } |
| 108 | return 0; |
| 109 | } else { |
| 110 | return rsl_data_request(msg, link_id); |
| 111 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 112 | } |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 113 | |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 114 | /** |
| 115 | * Send a GSM08.08 Assignment Request. Right now this does not contain the |
| 116 | * audio codec type or the allowed rates for the config. |
| 117 | */ |
| 118 | int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_type, int audio) |
| 119 | { |
| 120 | struct bsc_api *api; |
| 121 | api = conn->bts->network->bsc_api; |
| 122 | |
| 123 | api->assign_fail(conn, 0); |
| 124 | return 0; |
| 125 | } |
| 126 | |
Holger Hans Peter Freyther | 897ad9a | 2010-06-16 14:10:45 +0800 | [diff] [blame] | 127 | int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len, |
| 128 | uint8_t *mi, int chan_type) |
| 129 | { |
| 130 | return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type); |
| 131 | } |
| 132 | |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 133 | /* dequeue messages to layer 4 */ |
| 134 | int bsc_upqueue(struct gsm_network *net) |
| 135 | { |
| 136 | struct gsm_mncc *mncc; |
| 137 | struct msgb *msg; |
| 138 | int work = 0; |
| 139 | |
| 140 | if (net) |
| 141 | while ((msg = msgb_dequeue(&net->upqueue))) { |
| 142 | mncc = (struct gsm_mncc *)msg->data; |
| 143 | if (net->mncc_recv) |
| 144 | net->mncc_recv(net, mncc->msg_type, mncc); |
| 145 | work = 1; /* work done */ |
| 146 | talloc_free(msg); |
| 147 | } |
| 148 | |
| 149 | return work; |
| 150 | } |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 151 | |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 152 | static void dispatch_dtap(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| 153 | { |
| 154 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
| 155 | struct gsm48_hdr *gh; |
| 156 | uint8_t pdisc; |
| 157 | int rc; |
| 158 | |
| 159 | if (msgb_l3len(msg) < sizeof(*gh)) { |
| 160 | LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n"); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | gh = msgb_l3(msg); |
| 165 | pdisc = gh->proto_discr & 0x0f; |
| 166 | switch (pdisc) { |
| 167 | case GSM48_PDISC_RR: |
| 168 | switch (gh->msg_type) { |
| 169 | case GSM48_MT_RR_CIPH_M_COMPL: |
| 170 | if (api->cipher_mode_compl) |
| 171 | return api->cipher_mode_compl(conn, msg, |
| 172 | conn->lchan->encr.alg_id); |
| 173 | break; |
| 174 | case GSM48_MT_RR_ASS_COMPL: |
| 175 | LOGP(DMSC, LOGL_ERROR, "Assignment command is not handled.\n"); |
| 176 | break; |
| 177 | case GSM48_MT_RR_ASS_FAIL: |
| 178 | LOGP(DMSC, LOGL_ERROR, "Assignment failure is not handled.\n"); |
| 179 | break; |
| 180 | case GSM48_MT_RR_CHAN_MODE_MODIF_ACK: |
| 181 | rc = gsm48_rx_rr_modif_ack(msg); |
| 182 | if (rc < 0 && api->assign_fail) |
| 183 | api->assign_fail(conn, |
| 184 | GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE); |
| 185 | else if (rc >= 0 && api->assign_compl) |
| 186 | api->assign_compl(conn, 0); |
| 187 | return; |
| 188 | break; |
| 189 | } |
| 190 | break; |
| 191 | case GSM48_PDISC_MM: |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | /* default case */ |
| 196 | if (api->dtap) |
| 197 | api->dtap(conn, msg); |
| 198 | } |
| 199 | |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 200 | int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id) |
| 201 | { |
| 202 | int rc; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 203 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 204 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 205 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 206 | lchan = msg->lchan; |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 207 | if (lchan->state != LCHAN_S_ACTIVE) { |
| 208 | LOGP(DRSL, LOGL_ERROR, "Got data in non active state. discarding.\n"); |
| 209 | return -1; |
| 210 | } |
| 211 | |
| 212 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 213 | if (lchan->conn) { |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 214 | dispatch_dtap(lchan->conn, msg); |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 215 | } else { |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 216 | rc = BSC_API_CONN_POL_REJECT; |
| 217 | lchan->conn = subscr_con_allocate(msg->lchan); |
| 218 | |
| 219 | if (lchan->conn) |
| 220 | rc = api->compl_l3(lchan->conn, msg, 0); |
| 221 | |
| 222 | if (rc != BSC_API_CONN_POL_ACCEPT) { |
| 223 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 224 | lchan_release(lchan, 0, 0); |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 225 | } |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
Holger Hans Peter Freyther | 2158893 | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 231 | int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher, |
| 232 | uint8_t *key, int len) |
| 233 | { |
| 234 | return -1; |
| 235 | } |
| 236 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 237 | /* |
| 238 | * Release all occupied RF Channels but stay around for more. |
| 239 | */ |
Holger Hans Peter Freyther | dfd61a3 | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 240 | int gsm0808_clear(struct gsm_subscriber_connection *conn) |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 241 | { |
Holger Hans Peter Freyther | 8570887 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 242 | if (conn->ho_lchan) |
| 243 | bsc_clear_handover(conn); |
Holger Hans Peter Freyther | 8a945c8 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 244 | |
Holger Hans Peter Freyther | 8570887 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 245 | if (conn->lchan) { |
| 246 | lchan_release(conn->lchan, 1, 0); |
| 247 | conn->lchan->conn = NULL; |
| 248 | } |
| 249 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 250 | conn->lchan = NULL; |
| 251 | conn->ho_lchan = NULL; |
| 252 | conn->bts = NULL; |
| 253 | |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 254 | return 0; |
| 255 | } |
| 256 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 257 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id) |
| 258 | { |
| 259 | struct bsc_api *api; |
| 260 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 261 | if (!conn) |
| 262 | return; |
| 263 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 264 | api = conn->bts->network->bsc_api; |
| 265 | if (!api || !api->sapi_n_reject) |
| 266 | return; |
| 267 | |
| 268 | api->sapi_n_reject(conn, link_id); |
| 269 | } |
| 270 | |
| 271 | static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind) |
| 272 | { |
| 273 | struct msgb *msg = _data; |
| 274 | |
| 275 | switch (rllr_ind) { |
| 276 | case BSC_RLLR_IND_EST_CONF: |
| 277 | rsl_data_request(msg, OBSC_LINKID_CB(msg)); |
| 278 | break; |
| 279 | case BSC_RLLR_IND_REL_IND: |
| 280 | case BSC_RLLR_IND_ERR_IND: |
| 281 | case BSC_RLLR_IND_TIMEOUT: |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 282 | send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg)); |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 283 | msgb_free(msg); |
| 284 | break; |
| 285 | } |
| 286 | } |
| 287 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 288 | static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal, |
| 289 | void *handler_data, void *signal_data) |
| 290 | { |
| 291 | struct bsc_api *bsc; |
| 292 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 293 | struct gsm_subscriber_connection *conn; |
Holger Hans Peter Freyther | 0aa55a3 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 294 | int destruct = 1; |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 295 | |
| 296 | if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE) |
| 297 | return 0; |
| 298 | |
| 299 | lchan = (struct gsm_lchan *)signal_data; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 300 | if (!lchan || !lchan->conn) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 301 | return 0; |
| 302 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 303 | bsc = lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 304 | if (!bsc) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 305 | return 0; |
| 306 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 307 | conn = lchan->conn; |
| 308 | if (bsc->clear_request) |
Holger Hans Peter Freyther | 0aa55a3 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 309 | destruct = bsc->clear_request(conn, 0); |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 310 | |
| 311 | /* now give up all channels */ |
| 312 | if (conn->lchan == lchan) |
| 313 | conn->lchan = NULL; |
| 314 | if (conn->ho_lchan == lchan) |
| 315 | conn->ho_lchan = NULL; |
| 316 | gsm0808_clear(conn); |
| 317 | |
Holger Hans Peter Freyther | 0aa55a3 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 318 | if (destruct) |
| 319 | subscr_con_free(conn); |
| 320 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static __attribute__((constructor)) void on_dso_load_bsc(void) |
| 325 | { |
| 326 | register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL); |
Holger Hans Peter Freyther | b2f49a5 | 2010-06-15 11:20:24 +0800 | [diff] [blame] | 327 | } |