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> |
Holger Hans Peter Freyther | 3463f1b | 2010-12-22 12:32:56 +0100 | [diff] [blame] | 28 | #include <openbsc/gsm_subscriber.h> |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 29 | #include <openbsc/signal.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 30 | #include <openbsc/abis_rsl.h> |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 31 | #include <openbsc/chan_alloc.h> |
Holger Hans Peter Freyther | df5f724 | 2010-06-30 12:58:14 +0800 | [diff] [blame] | 32 | #include <openbsc/handover.h> |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 33 | #include <openbsc/debug.h> |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 34 | #include <openbsc/gsm_04_08.h> |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 35 | |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 36 | #include <osmocore/protocol/gsm_08_08.h> |
| 37 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 38 | #include <osmocore/talloc.h> |
| 39 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 40 | #define GSM0808_T10_VALUE 6, 0 |
| 41 | |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 42 | static LLIST_HEAD(sub_connections); |
| 43 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 44 | static void rll_ind_cb(struct gsm_lchan *, uint8_t, void *, enum bsc_rllr_ind); |
| 45 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id); |
Holger Hans Peter Freyther | b20fb42 | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 46 | static void handle_release(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan); |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 47 | static void handle_chan_ack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan); |
| 48 | static void handle_chan_nack(struct gsm_subscriber_connection *conn, struct bsc_api *bsc, struct gsm_lchan *lchan); |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 49 | |
Holger Hans Peter Freyther | 8dd01ef | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 50 | /* GSM 08.08 3.2.2.33 */ |
| 51 | static u_int8_t lchan_to_chosen_channel(struct gsm_lchan *lchan) |
| 52 | { |
| 53 | u_int8_t channel_mode = 0, channel = 0; |
| 54 | |
| 55 | switch (lchan->tch_mode) { |
| 56 | case GSM48_CMODE_SPEECH_V1: |
| 57 | case GSM48_CMODE_SPEECH_EFR: |
| 58 | case GSM48_CMODE_SPEECH_AMR: |
| 59 | channel_mode = 0x9; |
| 60 | break; |
| 61 | case GSM48_CMODE_SIGN: |
| 62 | channel_mode = 0x8; |
| 63 | break; |
| 64 | case GSM48_CMODE_DATA_14k5: |
| 65 | channel_mode = 0xe; |
| 66 | break; |
| 67 | case GSM48_CMODE_DATA_12k0: |
| 68 | channel_mode = 0xb; |
| 69 | break; |
| 70 | case GSM48_CMODE_DATA_6k0: |
| 71 | channel_mode = 0xc; |
| 72 | break; |
| 73 | case GSM48_CMODE_DATA_3k6: |
| 74 | channel_mode = 0xd; |
| 75 | break; |
| 76 | } |
| 77 | |
| 78 | switch (lchan->type) { |
| 79 | case GSM_LCHAN_NONE: |
| 80 | channel = 0x0; |
| 81 | break; |
| 82 | case GSM_LCHAN_SDCCH: |
| 83 | channel = 0x1; |
| 84 | break; |
| 85 | case GSM_LCHAN_TCH_F: |
| 86 | channel = 0x8; |
| 87 | break; |
| 88 | case GSM_LCHAN_TCH_H: |
| 89 | channel = 0x9; |
| 90 | break; |
| 91 | case GSM_LCHAN_UNKNOWN: |
| 92 | LOGP(DMSC, LOGL_ERROR, "Unknown lchan type: %p\n", lchan); |
| 93 | break; |
| 94 | } |
| 95 | |
| 96 | return channel_mode << 4 | channel; |
| 97 | } |
| 98 | |
| 99 | static u_int8_t chan_mode_to_speech(struct gsm_lchan *lchan) |
| 100 | { |
| 101 | int mode = 0; |
| 102 | |
| 103 | switch (lchan->tch_mode) { |
| 104 | case GSM48_CMODE_SPEECH_V1: |
| 105 | mode = 1; |
| 106 | break; |
| 107 | case GSM48_CMODE_SPEECH_EFR: |
| 108 | mode = 0x11; |
| 109 | break; |
| 110 | case GSM48_CMODE_SPEECH_AMR: |
| 111 | mode = 0x21; |
| 112 | break; |
| 113 | case GSM48_CMODE_SIGN: |
| 114 | case GSM48_CMODE_DATA_14k5: |
| 115 | case GSM48_CMODE_DATA_12k0: |
| 116 | case GSM48_CMODE_DATA_6k0: |
| 117 | case GSM48_CMODE_DATA_3k6: |
| 118 | default: |
| 119 | LOGP(DMSC, LOGL_ERROR, "Using non speech mode: %d\n", mode); |
| 120 | return 0; |
| 121 | break; |
| 122 | } |
| 123 | |
| 124 | /* assume to always do AMR HR on any TCH type */ |
| 125 | if (lchan->type == GSM_LCHAN_TCH_H || |
| 126 | lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) |
| 127 | mode |= 0x4; |
| 128 | |
| 129 | return mode; |
| 130 | } |
| 131 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 132 | static void assignment_t10_timeout(void *_conn) |
| 133 | { |
| 134 | struct bsc_api *api; |
| 135 | struct gsm_subscriber_connection *conn = |
| 136 | (struct gsm_subscriber_connection *) _conn; |
| 137 | |
| 138 | LOGP(DMSC, LOGL_ERROR, "Assigment T10 timeout on %p\n", conn); |
| 139 | |
| 140 | /* normal release on the secondary channel */ |
| 141 | lchan_release(conn->secondary_lchan, 0, 1); |
| 142 | conn->secondary_lchan = NULL; |
| 143 | |
| 144 | /* inform them about the failure */ |
| 145 | api = conn->bts->network->bsc_api; |
| 146 | api->assign_fail(conn, GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * Start a new assignment and make sure that it is completed within T10 either |
| 151 | * positively, negatively or by the timeout. |
| 152 | * |
| 153 | * 1.) allocate a new lchan |
| 154 | * 2.) copy the encryption key and other data from the |
| 155 | * old to the new channel. |
| 156 | * 3.) RSL Channel Activate this channel and wait |
| 157 | * |
| 158 | * -> Signal handler for the LCHAN |
| 159 | * 4.) Send GSM 04.08 assignment command to the MS |
| 160 | * |
| 161 | * -> Assignment Complete/Assignment Failure |
| 162 | * 5.) Release the SDCCH, continue signalling on the new link |
| 163 | */ |
| 164 | static int handle_new_assignment(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate) |
| 165 | { |
| 166 | struct gsm_lchan *new_lchan; |
| 167 | int chan_type; |
| 168 | |
| 169 | chan_type = full_rate ? GSM_LCHAN_TCH_F : GSM_LCHAN_TCH_H; |
| 170 | |
| 171 | new_lchan = lchan_alloc(conn->bts, chan_type, 0); |
| 172 | |
| 173 | if (!new_lchan) { |
| 174 | LOGP(DMSC, LOGL_NOTICE, "No free channel.\n"); |
| 175 | return -1; |
| 176 | } |
| 177 | |
| 178 | /* copy old data to the new channel */ |
| 179 | memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr)); |
| 180 | new_lchan->ms_power = conn->lchan->ms_power; |
| 181 | new_lchan->bs_power = conn->lchan->bs_power; |
| 182 | |
| 183 | /* copy new data to it */ |
| 184 | new_lchan->tch_mode = chan_mode; |
| 185 | new_lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH; |
| 186 | |
| 187 | /* handle AMR correctly */ |
| 188 | if (chan_mode == GSM48_CMODE_SPEECH_AMR) { |
| 189 | new_lchan->mr_conf.ver = 1; |
| 190 | new_lchan->mr_conf.icmi = 1; |
| 191 | new_lchan->mr_conf.m5_90 = 1; |
| 192 | } |
| 193 | |
| 194 | if (rsl_chan_activate_lchan(new_lchan, 0x1, 0, 0) < 0) { |
| 195 | LOGP(DHO, LOGL_ERROR, "could not activate channel\n"); |
| 196 | lchan_free(new_lchan); |
| 197 | return -1; |
| 198 | } |
| 199 | |
| 200 | /* remember that we have the channel */ |
| 201 | conn->secondary_lchan = new_lchan; |
| 202 | new_lchan->conn = conn; |
| 203 | |
| 204 | rsl_lchan_set_state(new_lchan, LCHAN_S_ACT_REQ); |
| 205 | return 0; |
| 206 | } |
Holger Hans Peter Freyther | 8dd01ef | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 207 | |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 208 | struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan) |
| 209 | { |
| 210 | struct gsm_subscriber_connection *conn; |
| 211 | |
| 212 | conn = talloc_zero(lchan->ts->trx->bts->network, struct gsm_subscriber_connection); |
| 213 | if (!conn) |
| 214 | return NULL; |
| 215 | |
| 216 | /* Configure the time and start it so it will be closed */ |
| 217 | conn->lchan = lchan; |
| 218 | conn->bts = lchan->ts->trx->bts; |
| 219 | lchan->conn = conn; |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 220 | llist_add_tail(&conn->entry, &sub_connections); |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 221 | return conn; |
| 222 | } |
| 223 | |
| 224 | /* TODO: move subscriber put here... */ |
| 225 | void subscr_con_free(struct gsm_subscriber_connection *conn) |
| 226 | { |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 227 | if (!conn) |
| 228 | return; |
| 229 | |
| 230 | |
| 231 | if (conn->subscr) { |
| 232 | subscr_put(conn->subscr); |
| 233 | conn->subscr = NULL; |
| 234 | } |
| 235 | |
| 236 | |
Holger Hans Peter Freyther | 7518458 | 2010-11-14 15:50:42 +0100 | [diff] [blame] | 237 | if (conn->ho_lchan) { |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 238 | LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n"); |
Holger Hans Peter Freyther | 7518458 | 2010-11-14 15:50:42 +0100 | [diff] [blame] | 239 | conn->ho_lchan->conn = NULL; |
| 240 | } |
| 241 | |
| 242 | if (conn->lchan) { |
| 243 | LOGP(DNM, LOGL_ERROR, "The lchan should have been cleared.\n"); |
| 244 | conn->lchan->conn = NULL; |
| 245 | } |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 246 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 247 | if (conn->secondary_lchan) { |
| 248 | LOGP(DNM, LOGL_ERROR, "The secondary_lchan should have been cleared.\n"); |
| 249 | conn->secondary_lchan->conn = NULL; |
| 250 | } |
| 251 | |
Holger Hans Peter Freyther | e519958 | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 252 | llist_del(&conn->entry); |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 253 | talloc_free(conn); |
Holger Hans Peter Freyther | a212ba5 | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 254 | } |
| 255 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 256 | int bsc_api_init(struct gsm_network *network, struct bsc_api *api) |
| 257 | { |
| 258 | network->bsc_api = api; |
| 259 | return 0; |
| 260 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 261 | |
| 262 | int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, |
Holger Hans Peter Freyther | 6bfcad8 | 2010-11-10 10:16:02 +0100 | [diff] [blame] | 263 | struct msgb *msg, int link_id, int allow_sach) |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 264 | { |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 265 | uint8_t sapi = link_id & 0x7; |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 266 | msg->lchan = conn->lchan; |
| 267 | msg->trx = msg->lchan->ts->trx; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 268 | |
Holger Hans Peter Freyther | 6bfcad8 | 2010-11-10 10:16:02 +0100 | [diff] [blame] | 269 | /* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */ |
| 270 | if (allow_sach && sapi != 0) { |
| 271 | if (conn->lchan->type == GSM_LCHAN_TCH_F || conn->lchan->type == GSM_LCHAN_TCH_H) |
| 272 | link_id |= 0x40; |
| 273 | } |
| 274 | |
Holger Hans Peter Freyther | a76bcb0 | 2010-06-17 17:48:13 +0800 | [diff] [blame] | 275 | msg->l3h = msg->data; |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 276 | if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) { |
| 277 | OBSC_LINKID_CB(msg) = link_id; |
| 278 | if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) { |
| 279 | msgb_free(msg); |
| 280 | send_sapi_reject(conn, link_id); |
| 281 | return -1; |
| 282 | } |
| 283 | return 0; |
| 284 | } else { |
| 285 | return rsl_data_request(msg, link_id); |
| 286 | } |
Holger Hans Peter Freyther | 7cdff24 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 287 | } |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 288 | |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 289 | /** |
| 290 | * Send a GSM08.08 Assignment Request. Right now this does not contain the |
Holger Hans Peter Freyther | 9113583 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 291 | * audio codec type or the allowed rates for the config. It is assumed that |
| 292 | * this is for audio handling and that when we have a TCH it is capable of |
| 293 | * handling the audio codec. On top of that it is assumed that we are using |
| 294 | * AMR 5.9 when assigning a TCH/H. |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 295 | */ |
Holger Hans Peter Freyther | 1de909f | 2010-11-10 10:01:20 +0100 | [diff] [blame] | 296 | int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate) |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 297 | { |
| 298 | struct bsc_api *api; |
| 299 | api = conn->bts->network->bsc_api; |
| 300 | |
Holger Hans Peter Freyther | 9113583 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 301 | if (conn->lchan->type == GSM_LCHAN_SDCCH) { |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 302 | if (handle_new_assignment(conn, chan_mode, full_rate) != 0) |
| 303 | goto error; |
Holger Hans Peter Freyther | 9113583 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 304 | } else { |
| 305 | LOGP(DMSC, LOGL_NOTICE, |
| 306 | "Sending ChanModify for speech %d %d\n", chan_mode, full_rate); |
| 307 | if (chan_mode == GSM48_CMODE_SPEECH_AMR) { |
| 308 | conn->lchan->mr_conf.ver = 1; |
| 309 | conn->lchan->mr_conf.icmi = 1; |
| 310 | conn->lchan->mr_conf.m5_90 = 1; |
| 311 | } |
| 312 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 313 | gsm48_lchan_modify(conn->lchan, chan_mode); |
Holger Hans Peter Freyther | 9113583 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 314 | } |
| 315 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 316 | /* we will now start the timer to complete the assignment */ |
| 317 | conn->T10.cb = assignment_t10_timeout; |
| 318 | conn->T10.data = conn; |
| 319 | bsc_schedule_timer(&conn->T10, GSM0808_T10_VALUE); |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 320 | return 0; |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 321 | |
| 322 | error: |
| 323 | api->assign_fail(conn, 0, NULL); |
| 324 | return -1; |
Holger Hans Peter Freyther | cf863e4 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 325 | } |
| 326 | |
Holger Hans Peter Freyther | 897ad9a | 2010-06-16 14:10:45 +0800 | [diff] [blame] | 327 | int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len, |
| 328 | uint8_t *mi, int chan_type) |
| 329 | { |
| 330 | return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type); |
| 331 | } |
| 332 | |
Holger Hans Peter Freyther | a7d3e8e | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 333 | /* dequeue messages to layer 4 */ |
| 334 | int bsc_upqueue(struct gsm_network *net) |
| 335 | { |
| 336 | struct gsm_mncc *mncc; |
| 337 | struct msgb *msg; |
| 338 | int work = 0; |
| 339 | |
| 340 | if (net) |
| 341 | while ((msg = msgb_dequeue(&net->upqueue))) { |
| 342 | mncc = (struct gsm_mncc *)msg->data; |
| 343 | if (net->mncc_recv) |
| 344 | net->mncc_recv(net, mncc->msg_type, mncc); |
| 345 | work = 1; /* work done */ |
| 346 | talloc_free(msg); |
| 347 | } |
| 348 | |
| 349 | return work; |
| 350 | } |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 351 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 352 | static void handle_ass_compl(struct gsm_subscriber_connection *conn, |
| 353 | struct msgb *msg) |
| 354 | { |
| 355 | struct gsm48_hdr *gh; |
| 356 | struct bsc_api *api = conn->bts->network->bsc_api; |
| 357 | |
| 358 | if (conn->secondary_lchan != msg->lchan) { |
| 359 | LOGP(DMSC, LOGL_ERROR, "Assignment Compl should occur on second lchan.\n"); |
| 360 | return; |
| 361 | } |
| 362 | |
| 363 | gh = msgb_l3(msg); |
| 364 | if (msgb_l3len(msg) - sizeof(*gh) != 1) { |
| 365 | LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %d\n", |
| 366 | msgb_l3len(msg) - sizeof(*gh)); |
| 367 | return; |
| 368 | } |
| 369 | |
| 370 | /* swap channels */ |
| 371 | bsc_del_timer(&conn->T10); |
| 372 | |
| 373 | lchan_release(conn->lchan, 0, 1); |
| 374 | conn->lchan = conn->secondary_lchan; |
| 375 | conn->secondary_lchan = NULL; |
| 376 | |
| 377 | if (is_ipaccess_bts(conn->bts) && conn->lchan->tch_mode != GSM48_CMODE_SIGN) |
| 378 | rsl_ipacc_crcx(conn->lchan); |
| 379 | |
| 380 | api->assign_compl(conn, gh->data[0], |
| 381 | lchan_to_chosen_channel(conn->lchan), |
| 382 | conn->lchan->encr.alg_id, |
| 383 | chan_mode_to_speech(conn->lchan)); |
| 384 | } |
| 385 | |
| 386 | static void handle_ass_fail(struct gsm_subscriber_connection *conn, |
| 387 | struct msgb *msg) |
| 388 | { |
| 389 | struct bsc_api *api = conn->bts->network->bsc_api; |
| 390 | uint8_t *rr_failure; |
| 391 | struct gsm48_hdr *gh; |
| 392 | |
| 393 | |
| 394 | if (conn->lchan != msg->lchan) { |
| 395 | LOGP(DMSC, LOGL_ERROR, "Assignment failure should occur on primary lchan.\n"); |
| 396 | return; |
| 397 | } |
| 398 | |
| 399 | /* stop the timer and release it */ |
| 400 | bsc_del_timer(&conn->T10); |
| 401 | lchan_release(conn->secondary_lchan, 0, 1); |
| 402 | conn->secondary_lchan = NULL; |
| 403 | |
| 404 | gh = msgb_l3(msg); |
| 405 | if (msgb_l3len(msg) - sizeof(*gh) != 1) { |
| 406 | LOGP(DMSC, LOGL_ERROR, "assignemnt failure unhandled: %d\n", |
| 407 | msgb_l3len(msg) - sizeof(*gh)); |
| 408 | rr_failure = NULL; |
| 409 | } else { |
| 410 | rr_failure = &gh->data[0]; |
| 411 | } |
| 412 | |
| 413 | api->assign_fail(conn, |
| 414 | GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE, |
| 415 | rr_failure); |
| 416 | } |
| 417 | |
Holger Hans Peter Freyther | 767ff3c | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 418 | static void dispatch_dtap(struct gsm_subscriber_connection *conn, |
| 419 | uint8_t link_id, struct msgb *msg) |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 420 | { |
| 421 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
| 422 | struct gsm48_hdr *gh; |
| 423 | uint8_t pdisc; |
| 424 | int rc; |
| 425 | |
| 426 | if (msgb_l3len(msg) < sizeof(*gh)) { |
| 427 | LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n"); |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | gh = msgb_l3(msg); |
| 432 | pdisc = gh->proto_discr & 0x0f; |
| 433 | switch (pdisc) { |
| 434 | case GSM48_PDISC_RR: |
| 435 | switch (gh->msg_type) { |
| 436 | case GSM48_MT_RR_CIPH_M_COMPL: |
| 437 | if (api->cipher_mode_compl) |
| 438 | return api->cipher_mode_compl(conn, msg, |
| 439 | conn->lchan->encr.alg_id); |
| 440 | break; |
| 441 | case GSM48_MT_RR_ASS_COMPL: |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 442 | handle_ass_compl(conn, msg); |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 443 | break; |
| 444 | case GSM48_MT_RR_ASS_FAIL: |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 445 | handle_ass_fail(conn, msg); |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 446 | break; |
| 447 | case GSM48_MT_RR_CHAN_MODE_MODIF_ACK: |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 448 | bsc_del_timer(&conn->T10); |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 449 | rc = gsm48_rx_rr_modif_ack(msg); |
Holger Hans Peter Freyther | 9ff6568 | 2010-11-05 10:37:17 +0100 | [diff] [blame] | 450 | if (rc < 0 && api->assign_fail) { |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 451 | api->assign_fail(conn, |
Holger Hans Peter Freyther | 9ff6568 | 2010-11-05 10:37:17 +0100 | [diff] [blame] | 452 | GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, |
| 453 | NULL); |
| 454 | } else if (rc >= 0 && api->assign_compl) |
Holger Hans Peter Freyther | 8dd01ef | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 455 | api->assign_compl(conn, 0, |
| 456 | lchan_to_chosen_channel(conn->lchan), |
| 457 | conn->lchan->encr.alg_id, |
| 458 | chan_mode_to_speech(conn->lchan)); |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 459 | return; |
| 460 | break; |
| 461 | } |
| 462 | break; |
| 463 | case GSM48_PDISC_MM: |
| 464 | break; |
| 465 | } |
| 466 | |
| 467 | /* default case */ |
| 468 | if (api->dtap) |
Holger Hans Peter Freyther | 767ff3c | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 469 | api->dtap(conn, link_id, msg); |
Holger Hans Peter Freyther | 801ecb6 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 470 | } |
| 471 | |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 472 | int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id) |
| 473 | { |
| 474 | int rc; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 475 | 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] | 476 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 477 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 478 | lchan = msg->lchan; |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 479 | if (lchan->state != LCHAN_S_ACTIVE) { |
Harald Welte | a7a1ea5 | 2010-12-24 13:06:11 +0100 | [diff] [blame] | 480 | LOGP(DRSL, LOGL_INFO, "Got data in non active state(%s), " |
| 481 | "discarding.\n", gsm_lchans_name(lchan->state)); |
Holger Hans Peter Freyther | 0e77ba2 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 482 | return -1; |
| 483 | } |
| 484 | |
| 485 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 486 | if (lchan->conn) { |
Holger Hans Peter Freyther | 767ff3c | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 487 | dispatch_dtap(lchan->conn, link_id, msg); |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 488 | } else { |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 489 | rc = BSC_API_CONN_POL_REJECT; |
| 490 | lchan->conn = subscr_con_allocate(msg->lchan); |
| 491 | |
| 492 | if (lchan->conn) |
| 493 | rc = api->compl_l3(lchan->conn, msg, 0); |
| 494 | |
| 495 | if (rc != BSC_API_CONN_POL_ACCEPT) { |
Holger Hans Peter Freyther | 473ba0f | 2010-11-15 10:33:59 +0100 | [diff] [blame] | 496 | lchan->conn->lchan = NULL; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 497 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 498 | lchan_release(lchan, 0, 0); |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 499 | } |
Holger Hans Peter Freyther | b979579 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | return 0; |
| 503 | } |
| 504 | |
Holger Hans Peter Freyther | 2158893 | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 505 | int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher, |
Holger Hans Peter Freyther | 1b1259e | 2010-11-10 09:42:50 +0100 | [diff] [blame] | 506 | const uint8_t *key, int len, int include_imeisv) |
Holger Hans Peter Freyther | 2158893 | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 507 | { |
Holger Hans Peter Freyther | 0c117b3 | 2010-11-10 10:25:34 +0100 | [diff] [blame] | 508 | if (cipher > 0 && key == NULL) { |
| 509 | LOGP(DRSL, LOGL_ERROR, "Need to have an encrytpion key.\n"); |
| 510 | return -1; |
| 511 | } |
| 512 | |
| 513 | if (len > MAX_A5_KEY_LEN) { |
| 514 | LOGP(DRSL, LOGL_ERROR, "The key is too long: %d\n", len); |
| 515 | return -1; |
| 516 | } |
| 517 | |
| 518 | conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher); |
| 519 | if (key) { |
| 520 | conn->lchan->encr.key_len = len; |
| 521 | memcpy(conn->lchan->encr.key, key, len); |
| 522 | } |
| 523 | |
| 524 | return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv); |
Holger Hans Peter Freyther | 2158893 | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 525 | } |
| 526 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 527 | /* |
| 528 | * Release all occupied RF Channels but stay around for more. |
| 529 | */ |
Holger Hans Peter Freyther | dfd61a3 | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 530 | int gsm0808_clear(struct gsm_subscriber_connection *conn) |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 531 | { |
Holger Hans Peter Freyther | 8570887 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 532 | if (conn->ho_lchan) |
| 533 | bsc_clear_handover(conn); |
Holger Hans Peter Freyther | 8a945c8 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 534 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 535 | if (conn->secondary_lchan) |
| 536 | lchan_release(conn->secondary_lchan, 0, 1); |
| 537 | |
Holger Hans Peter Freyther | 5322dbf | 2010-11-14 16:04:46 +0100 | [diff] [blame] | 538 | if (conn->lchan) |
Holger Hans Peter Freyther | 8570887 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 539 | lchan_release(conn->lchan, 1, 0); |
Holger Hans Peter Freyther | 8570887 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 540 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 541 | conn->lchan = NULL; |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 542 | conn->secondary_lchan = NULL; |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 543 | conn->ho_lchan = NULL; |
| 544 | conn->bts = NULL; |
| 545 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 546 | bsc_del_timer(&conn->T10); |
| 547 | |
Holger Hans Peter Freyther | 6e5c50f | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 548 | return 0; |
| 549 | } |
| 550 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 551 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id) |
| 552 | { |
| 553 | struct bsc_api *api; |
| 554 | |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 555 | if (!conn) |
| 556 | return; |
| 557 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 558 | api = conn->bts->network->bsc_api; |
| 559 | if (!api || !api->sapi_n_reject) |
| 560 | return; |
| 561 | |
| 562 | api->sapi_n_reject(conn, link_id); |
| 563 | } |
| 564 | |
| 565 | static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind) |
| 566 | { |
| 567 | struct msgb *msg = _data; |
| 568 | |
Holger Hans Peter Freyther | 7dec9fb | 2010-11-10 10:59:05 +0100 | [diff] [blame] | 569 | /* |
| 570 | * There seems to be a small window that the RLL timer can |
| 571 | * fire after a lchan_release call and before the S_CHALLOC_FREED |
| 572 | * is called. Check if a conn is set before proceeding. |
| 573 | */ |
| 574 | if (!lchan->conn) |
| 575 | return; |
| 576 | |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 577 | switch (rllr_ind) { |
| 578 | case BSC_RLLR_IND_EST_CONF: |
| 579 | rsl_data_request(msg, OBSC_LINKID_CB(msg)); |
| 580 | break; |
| 581 | case BSC_RLLR_IND_REL_IND: |
| 582 | case BSC_RLLR_IND_ERR_IND: |
| 583 | case BSC_RLLR_IND_TIMEOUT: |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 584 | send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg)); |
Holger Hans Peter Freyther | ee2be4c | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 585 | msgb_free(msg); |
| 586 | break; |
| 587 | } |
| 588 | } |
| 589 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 590 | static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal, |
| 591 | void *handler_data, void *signal_data) |
| 592 | { |
| 593 | struct bsc_api *bsc; |
| 594 | struct gsm_lchan *lchan; |
| 595 | |
Holger Hans Peter Freyther | b20fb42 | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 596 | if (subsys != SS_LCHAN) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 597 | return 0; |
| 598 | |
| 599 | lchan = (struct gsm_lchan *)signal_data; |
Holger Hans Peter Freyther | 1a95fa8 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 600 | if (!lchan || !lchan->conn) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 601 | return 0; |
| 602 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 603 | bsc = lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 604 | if (!bsc) |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 605 | return 0; |
| 606 | |
Holger Hans Peter Freyther | b20fb42 | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 607 | switch (signal) { |
| 608 | case S_LCHAN_UNEXPECTED_RELEASE: |
| 609 | handle_release(lchan->conn, bsc, lchan); |
| 610 | break; |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 611 | case S_LCHAN_ACTIVATE_ACK: |
| 612 | handle_chan_ack(lchan->conn, bsc, lchan); |
| 613 | break; |
| 614 | case S_LCHAN_ACTIVATE_NACK: |
| 615 | handle_chan_nack(lchan->conn, bsc, lchan); |
| 616 | break; |
Holger Hans Peter Freyther | b20fb42 | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | static void handle_release(struct gsm_subscriber_connection *conn, |
| 623 | struct bsc_api *bsc, struct gsm_lchan *lchan) |
| 624 | { |
| 625 | int destruct = 1; |
| 626 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 627 | /* now give up all channels */ |
| 628 | if (conn->lchan == lchan) |
| 629 | conn->lchan = NULL; |
| 630 | if (conn->ho_lchan == lchan) |
| 631 | conn->ho_lchan = NULL; |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 632 | if (conn->secondary_lchan == lchan) { |
| 633 | bsc_del_timer(&conn->T10); |
| 634 | conn->secondary_lchan = NULL; |
| 635 | |
| 636 | bsc->assign_fail(conn, |
| 637 | GSM0808_CAUSE_RADIO_INTERFACE_FAILURE, |
| 638 | NULL); |
| 639 | } |
| 640 | |
Holger Hans Peter Freyther | f3ddb3c | 2010-11-15 09:59:58 +0100 | [diff] [blame] | 641 | lchan->conn = NULL; |
| 642 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 643 | /* clear the connection now */ |
| 644 | if (bsc->clear_request) |
| 645 | destruct = bsc->clear_request(conn, 0); |
| 646 | |
| 647 | |
Holger Hans Peter Freyther | 7d85564 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 648 | gsm0808_clear(conn); |
| 649 | |
Holger Hans Peter Freyther | 0aa55a3 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 650 | if (destruct) |
| 651 | subscr_con_free(conn); |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 652 | } |
| 653 | |
Holger Hans Peter Freyther | 7a3b01b | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 654 | static void handle_chan_ack(struct gsm_subscriber_connection *conn, |
| 655 | struct bsc_api *api, struct gsm_lchan *lchan) |
| 656 | { |
| 657 | if (conn->secondary_lchan != lchan) |
| 658 | return; |
| 659 | |
| 660 | LOGP(DMSC, LOGL_NOTICE, "Sending assignment on chan: %p\n", lchan); |
| 661 | gsm48_send_rr_ass_cmd(conn->lchan, lchan, 0x3); |
| 662 | } |
| 663 | |
| 664 | static void handle_chan_nack(struct gsm_subscriber_connection *conn, |
| 665 | struct bsc_api *api, struct gsm_lchan *lchan) |
| 666 | { |
| 667 | if (conn->secondary_lchan != lchan) |
| 668 | return; |
| 669 | |
| 670 | LOGP(DMSC, LOGL_ERROR, "Channel activation failed. Waiting for timeout now\n"); |
| 671 | conn->secondary_lchan->conn = NULL; |
| 672 | conn->secondary_lchan = NULL; |
| 673 | } |
| 674 | |
Holger Hans Peter Freyther | 39c90ef | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 675 | static __attribute__((constructor)) void on_dso_load_bsc(void) |
| 676 | { |
| 677 | register_signal_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL); |
Holger Hans Peter Freyther | b2f49a5 | 2010-06-15 11:20:24 +0800 | [diff] [blame] | 678 | } |