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 | |
Holger Hans Peter Freyther | 594b322 | 2011-08-06 06:42:00 +0200 | [diff] [blame] | 3 | /* (C) 2010-2011 by Holger Hans Peter Freyther |
| 4 | * (C) 2010-2011 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 |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 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 |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 17 | * GNU Affero General Public License for more details. |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 18 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <openbsc/bsc_api.h> |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 25 | #include <openbsc/bsc_rll.h> |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 26 | #include <openbsc/gsm_data.h> |
Holger Hans Peter Freyther | e2fee35 | 2010-12-22 12:32:56 +0100 | [diff] [blame] | 27 | #include <openbsc/gsm_subscriber.h> |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 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 | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 33 | #include <openbsc/gsm_04_08.h> |
Andreas Eversberg | dcf38e1 | 2013-12-05 14:37:11 +0100 | [diff] [blame] | 34 | #include <openbsc/trau_mux.h> |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 35 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 36 | #include <osmocom/gsm/protocol/gsm_08_08.h> |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 37 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 38 | #include <osmocom/core/talloc.h> |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 39 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 40 | #define GSM0808_T10_VALUE 6, 0 |
| 41 | |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 42 | static LLIST_HEAD(sub_connections); |
| 43 | |
Holger Hans Peter Freyther | 9c595b7 | 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 | f05750c | 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 | 77cd95d | 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 | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 49 | |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 50 | /* GSM 08.08 3.2.2.33 */ |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 51 | static uint8_t lchan_to_chosen_channel(struct gsm_lchan *lchan) |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 52 | { |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 53 | uint8_t channel_mode = 0, channel = 0; |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 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: |
Harald Welte | 7b1d25a | 2015-01-01 12:32:03 +0100 | [diff] [blame] | 92 | default: |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 93 | LOGP(DMSC, LOGL_ERROR, "Unknown lchan type: %p\n", lchan); |
| 94 | break; |
| 95 | } |
| 96 | |
| 97 | return channel_mode << 4 | channel; |
| 98 | } |
| 99 | |
Holger Hans Peter Freyther | c42ad8b | 2011-04-18 17:04:00 +0200 | [diff] [blame] | 100 | static uint8_t chan_mode_to_speech(struct gsm_lchan *lchan) |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 101 | { |
| 102 | int mode = 0; |
| 103 | |
| 104 | switch (lchan->tch_mode) { |
| 105 | case GSM48_CMODE_SPEECH_V1: |
| 106 | mode = 1; |
| 107 | break; |
| 108 | case GSM48_CMODE_SPEECH_EFR: |
| 109 | mode = 0x11; |
| 110 | break; |
| 111 | case GSM48_CMODE_SPEECH_AMR: |
| 112 | mode = 0x21; |
| 113 | break; |
| 114 | case GSM48_CMODE_SIGN: |
| 115 | case GSM48_CMODE_DATA_14k5: |
| 116 | case GSM48_CMODE_DATA_12k0: |
| 117 | case GSM48_CMODE_DATA_6k0: |
| 118 | case GSM48_CMODE_DATA_3k6: |
| 119 | default: |
| 120 | LOGP(DMSC, LOGL_ERROR, "Using non speech mode: %d\n", mode); |
| 121 | return 0; |
| 122 | break; |
| 123 | } |
| 124 | |
| 125 | /* assume to always do AMR HR on any TCH type */ |
| 126 | if (lchan->type == GSM_LCHAN_TCH_H || |
| 127 | lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) |
| 128 | mode |= 0x4; |
| 129 | |
| 130 | return mode; |
| 131 | } |
| 132 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 133 | static void assignment_t10_timeout(void *_conn) |
| 134 | { |
| 135 | struct bsc_api *api; |
| 136 | struct gsm_subscriber_connection *conn = |
| 137 | (struct gsm_subscriber_connection *) _conn; |
| 138 | |
| 139 | LOGP(DMSC, LOGL_ERROR, "Assigment T10 timeout on %p\n", conn); |
| 140 | |
Holger Hans Peter Freyther | cab0d7b | 2011-08-30 19:07:58 +0200 | [diff] [blame] | 141 | /* |
| 142 | * normal release on the secondary channel but only if the |
| 143 | * secondary_channel has not been released by the handle_chan_nack. |
| 144 | */ |
| 145 | if (conn->secondary_lchan) |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 146 | lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 147 | conn->secondary_lchan = NULL; |
| 148 | |
| 149 | /* inform them about the failure */ |
| 150 | api = conn->bts->network->bsc_api; |
| 151 | api->assign_fail(conn, GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, NULL); |
| 152 | } |
| 153 | |
Holger Hans Peter Freyther | 594b322 | 2011-08-06 06:42:00 +0200 | [diff] [blame] | 154 | /** |
| 155 | * Handle the multirate config |
| 156 | */ |
| 157 | static void handle_mr_config(struct gsm_subscriber_connection *conn, |
| 158 | struct gsm_lchan *lchan) |
| 159 | { |
Holger Hans Peter Freyther | 25aa749 | 2011-08-06 07:00:52 +0200 | [diff] [blame] | 160 | struct bsc_api *api; |
| 161 | api = conn->bts->network->bsc_api; |
| 162 | |
| 163 | if (api->mr_config) |
| 164 | return api->mr_config(conn, &lchan->mr_conf); |
| 165 | |
Holger Hans Peter Freyther | 594b322 | 2011-08-06 06:42:00 +0200 | [diff] [blame] | 166 | lchan->mr_conf.ver = 1; |
| 167 | lchan->mr_conf.icmi = 1; |
| 168 | lchan->mr_conf.m5_90 = 1; |
| 169 | } |
| 170 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 171 | /* |
| 172 | * Start a new assignment and make sure that it is completed within T10 either |
| 173 | * positively, negatively or by the timeout. |
| 174 | * |
| 175 | * 1.) allocate a new lchan |
| 176 | * 2.) copy the encryption key and other data from the |
| 177 | * old to the new channel. |
| 178 | * 3.) RSL Channel Activate this channel and wait |
| 179 | * |
| 180 | * -> Signal handler for the LCHAN |
| 181 | * 4.) Send GSM 04.08 assignment command to the MS |
| 182 | * |
| 183 | * -> Assignment Complete/Assignment Failure |
| 184 | * 5.) Release the SDCCH, continue signalling on the new link |
| 185 | */ |
| 186 | static int handle_new_assignment(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate) |
| 187 | { |
| 188 | struct gsm_lchan *new_lchan; |
| 189 | int chan_type; |
| 190 | |
| 191 | chan_type = full_rate ? GSM_LCHAN_TCH_F : GSM_LCHAN_TCH_H; |
| 192 | |
| 193 | new_lchan = lchan_alloc(conn->bts, chan_type, 0); |
| 194 | |
| 195 | if (!new_lchan) { |
| 196 | LOGP(DMSC, LOGL_NOTICE, "No free channel.\n"); |
| 197 | return -1; |
| 198 | } |
| 199 | |
| 200 | /* copy old data to the new channel */ |
| 201 | memcpy(&new_lchan->encr, &conn->lchan->encr, sizeof(new_lchan->encr)); |
| 202 | new_lchan->ms_power = conn->lchan->ms_power; |
| 203 | new_lchan->bs_power = conn->lchan->bs_power; |
Andreas Eversberg | 723a751 | 2013-10-11 12:55:35 +0200 | [diff] [blame] | 204 | new_lchan->rqd_ta = conn->lchan->rqd_ta; |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 205 | |
| 206 | /* copy new data to it */ |
| 207 | new_lchan->tch_mode = chan_mode; |
| 208 | new_lchan->rsl_cmode = RSL_CMOD_SPD_SPEECH; |
| 209 | |
| 210 | /* handle AMR correctly */ |
Holger Hans Peter Freyther | 594b322 | 2011-08-06 06:42:00 +0200 | [diff] [blame] | 211 | if (chan_mode == GSM48_CMODE_SPEECH_AMR) |
| 212 | handle_mr_config(conn, new_lchan); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 213 | |
Andreas Eversberg | 723a751 | 2013-10-11 12:55:35 +0200 | [diff] [blame] | 214 | if (rsl_chan_activate_lchan(new_lchan, 0x1, 0) < 0) { |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 215 | LOGP(DHO, LOGL_ERROR, "could not activate channel\n"); |
| 216 | lchan_free(new_lchan); |
| 217 | return -1; |
| 218 | } |
| 219 | |
| 220 | /* remember that we have the channel */ |
| 221 | conn->secondary_lchan = new_lchan; |
| 222 | new_lchan->conn = conn; |
| 223 | |
| 224 | rsl_lchan_set_state(new_lchan, LCHAN_S_ACT_REQ); |
| 225 | return 0; |
| 226 | } |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 227 | |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 228 | struct gsm_subscriber_connection *subscr_con_allocate(struct gsm_lchan *lchan) |
| 229 | { |
| 230 | struct gsm_subscriber_connection *conn; |
| 231 | |
| 232 | conn = talloc_zero(lchan->ts->trx->bts->network, struct gsm_subscriber_connection); |
| 233 | if (!conn) |
| 234 | return NULL; |
| 235 | |
| 236 | /* Configure the time and start it so it will be closed */ |
| 237 | conn->lchan = lchan; |
| 238 | conn->bts = lchan->ts->trx->bts; |
| 239 | lchan->conn = conn; |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 240 | llist_add_tail(&conn->entry, &sub_connections); |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 241 | return conn; |
| 242 | } |
| 243 | |
| 244 | /* TODO: move subscriber put here... */ |
| 245 | void subscr_con_free(struct gsm_subscriber_connection *conn) |
| 246 | { |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 247 | if (!conn) |
| 248 | return; |
| 249 | |
| 250 | |
| 251 | if (conn->subscr) { |
| 252 | subscr_put(conn->subscr); |
| 253 | conn->subscr = NULL; |
| 254 | } |
| 255 | |
| 256 | |
Holger Hans Peter Freyther | a2828fa | 2010-11-14 15:50:42 +0100 | [diff] [blame] | 257 | if (conn->ho_lchan) { |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 258 | LOGP(DNM, LOGL_ERROR, "The ho_lchan should have been cleared.\n"); |
Holger Hans Peter Freyther | a2828fa | 2010-11-14 15:50:42 +0100 | [diff] [blame] | 259 | conn->ho_lchan->conn = NULL; |
| 260 | } |
| 261 | |
| 262 | if (conn->lchan) { |
| 263 | LOGP(DNM, LOGL_ERROR, "The lchan should have been cleared.\n"); |
| 264 | conn->lchan->conn = NULL; |
| 265 | } |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 266 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 267 | if (conn->secondary_lchan) { |
| 268 | LOGP(DNM, LOGL_ERROR, "The secondary_lchan should have been cleared.\n"); |
| 269 | conn->secondary_lchan->conn = NULL; |
| 270 | } |
| 271 | |
Holger Hans Peter Freyther | 79f763f | 2010-09-16 00:53:37 +0800 | [diff] [blame] | 272 | llist_del(&conn->entry); |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 273 | talloc_free(conn); |
Holger Hans Peter Freyther | a2aedad | 2010-09-16 00:47:32 +0800 | [diff] [blame] | 274 | } |
| 275 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 276 | int bsc_api_init(struct gsm_network *network, struct bsc_api *api) |
| 277 | { |
| 278 | network->bsc_api = api; |
| 279 | return 0; |
| 280 | } |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 281 | |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 282 | /*! \brief process incoming 08.08 DTAP from MSC (send via BTS to MS) */ |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 283 | int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn, |
Holger Hans Peter Freyther | afa0ad1 | 2012-04-18 18:58:36 +0200 | [diff] [blame] | 284 | struct msgb *msg, int link_id, int allow_sacch) |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 285 | { |
Holger Hans Peter Freyther | 8ce8d3a | 2010-12-27 10:55:45 +0100 | [diff] [blame] | 286 | uint8_t sapi; |
| 287 | |
| 288 | |
| 289 | if (!conn->lchan) { |
| 290 | LOGP(DMSC, LOGL_ERROR, |
| 291 | "Called submit dtap without an lchan.\n"); |
| 292 | msgb_free(msg); |
| 293 | return -1; |
| 294 | } |
| 295 | |
| 296 | sapi = link_id & 0x7; |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 297 | msg->lchan = conn->lchan; |
Pablo Neira Ayuso | 7abecfc | 2011-08-17 22:43:54 +0200 | [diff] [blame] | 298 | msg->dst = msg->lchan->ts->trx->rsl_link; |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 299 | |
Holger Hans Peter Freyther | 8d380dc | 2010-11-10 10:16:02 +0100 | [diff] [blame] | 300 | /* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */ |
Holger Hans Peter Freyther | afa0ad1 | 2012-04-18 18:58:36 +0200 | [diff] [blame] | 301 | if (allow_sacch && sapi != 0) { |
Holger Hans Peter Freyther | 8d380dc | 2010-11-10 10:16:02 +0100 | [diff] [blame] | 302 | if (conn->lchan->type == GSM_LCHAN_TCH_F || conn->lchan->type == GSM_LCHAN_TCH_H) |
| 303 | link_id |= 0x40; |
| 304 | } |
| 305 | |
Holger Hans Peter Freyther | f6d0e06 | 2010-06-17 17:48:13 +0800 | [diff] [blame] | 306 | msg->l3h = msg->data; |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 307 | /* is requested SAPI already up? */ |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 308 | if (conn->lchan->sapis[sapi] == LCHAN_SAPI_UNUSED) { |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 309 | /* Establish L2 for additional SAPI */ |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 310 | OBSC_LINKID_CB(msg) = link_id; |
| 311 | if (rll_establish(msg->lchan, sapi, rll_ind_cb, msg) != 0) { |
| 312 | msgb_free(msg); |
| 313 | send_sapi_reject(conn, link_id); |
| 314 | return -1; |
| 315 | } |
| 316 | return 0; |
| 317 | } else { |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 318 | /* Directly forward via RLL/RSL to BTS */ |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 319 | return rsl_data_request(msg, link_id); |
| 320 | } |
Holger Hans Peter Freyther | ec32b58 | 2010-03-23 07:40:46 +0100 | [diff] [blame] | 321 | } |
Holger Hans Peter Freyther | 2a9285c | 2010-06-14 18:03:06 +0800 | [diff] [blame] | 322 | |
Holger Hans Peter Freyther | a5dcdd9 | 2012-04-07 13:25:47 +0200 | [diff] [blame] | 323 | /* |
| 324 | * \brief Check if the given channel is compatible with the mode/fullrate |
Holger Hans Peter Freyther | a5dcdd9 | 2012-04-07 13:25:47 +0200 | [diff] [blame] | 325 | */ |
| 326 | static int chan_compat_with_mode(struct gsm_lchan *lchan, int chan_mode, int full_rate) |
| 327 | { |
Harald Welte | bb53e35 | 2012-08-24 15:21:35 +0200 | [diff] [blame] | 328 | switch (chan_mode) { |
| 329 | case GSM48_CMODE_SIGN: |
| 330 | /* signalling is always possible */ |
| 331 | return 1; |
| 332 | case GSM48_CMODE_SPEECH_V1: |
| 333 | case GSM48_CMODE_SPEECH_AMR: |
| 334 | case GSM48_CMODE_DATA_3k6: |
| 335 | case GSM48_CMODE_DATA_6k0: |
| 336 | /* these services can all run on TCH/H, but we may have |
| 337 | * an explicit override by the 'full_rate' argument */ |
| 338 | switch (lchan->type) { |
| 339 | case GSM_LCHAN_TCH_F: |
| 340 | return 1; |
| 341 | case GSM_LCHAN_TCH_H: |
| 342 | if (full_rate) |
| 343 | return 0; |
| 344 | else |
| 345 | return 1; |
| 346 | break; |
| 347 | default: |
| 348 | return 0; |
| 349 | } |
| 350 | break; |
| 351 | case GSM48_CMODE_DATA_12k0: |
| 352 | case GSM48_CMODE_DATA_14k5: |
| 353 | case GSM48_CMODE_SPEECH_EFR: |
| 354 | /* these services all explicitly require a TCH/F */ |
| 355 | if (lchan->type == GSM_LCHAN_TCH_F) |
| 356 | return 1; |
| 357 | else |
| 358 | return 0; |
| 359 | break; |
| 360 | } |
Holger Hans Peter Freyther | a5dcdd9 | 2012-04-07 13:25:47 +0200 | [diff] [blame] | 361 | |
Harald Welte | bb53e35 | 2012-08-24 15:21:35 +0200 | [diff] [blame] | 362 | return 0; |
Holger Hans Peter Freyther | a5dcdd9 | 2012-04-07 13:25:47 +0200 | [diff] [blame] | 363 | } |
| 364 | |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 365 | /** |
| 366 | * Send a GSM08.08 Assignment Request. Right now this does not contain the |
Holger Hans Peter Freyther | 088dde8 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 367 | * audio codec type or the allowed rates for the config. It is assumed that |
Holger Hans Peter Freyther | a5dcdd9 | 2012-04-07 13:25:47 +0200 | [diff] [blame] | 368 | * this is for audio handling only. In case the current channel does not allow |
| 369 | * the selected mode a new one will be allocated. |
| 370 | * |
| 371 | * TODO: Add multirate configuration, make it work for more than audio. |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 372 | */ |
Holger Hans Peter Freyther | 2603c1f | 2010-11-10 10:01:20 +0100 | [diff] [blame] | 373 | int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate) |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 374 | { |
| 375 | struct bsc_api *api; |
| 376 | api = conn->bts->network->bsc_api; |
| 377 | |
Harald Welte | 9fc70f3 | 2012-08-24 15:08:23 +0200 | [diff] [blame] | 378 | if (!chan_compat_with_mode(conn->lchan, chan_mode, full_rate)) { |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 379 | if (handle_new_assignment(conn, chan_mode, full_rate) != 0) |
| 380 | goto error; |
Holger Hans Peter Freyther | 088dde8 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 381 | } else { |
| 382 | LOGP(DMSC, LOGL_NOTICE, |
| 383 | "Sending ChanModify for speech %d %d\n", chan_mode, full_rate); |
Holger Hans Peter Freyther | 594b322 | 2011-08-06 06:42:00 +0200 | [diff] [blame] | 384 | if (chan_mode == GSM48_CMODE_SPEECH_AMR) |
| 385 | handle_mr_config(conn, conn->lchan); |
Holger Hans Peter Freyther | 088dde8 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 386 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 387 | gsm48_lchan_modify(conn->lchan, chan_mode); |
Holger Hans Peter Freyther | 088dde8 | 2010-11-10 11:07:12 +0100 | [diff] [blame] | 388 | } |
| 389 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 390 | /* we will now start the timer to complete the assignment */ |
| 391 | conn->T10.cb = assignment_t10_timeout; |
| 392 | conn->T10.data = conn; |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 393 | osmo_timer_schedule(&conn->T10, GSM0808_T10_VALUE); |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 394 | return 0; |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 395 | |
| 396 | error: |
| 397 | api->assign_fail(conn, 0, NULL); |
| 398 | return -1; |
Holger Hans Peter Freyther | c354de8 | 2010-07-23 16:49:38 +0800 | [diff] [blame] | 399 | } |
| 400 | |
Holger Hans Peter Freyther | 7700846 | 2010-06-16 14:10:45 +0800 | [diff] [blame] | 401 | int gsm0808_page(struct gsm_bts *bts, unsigned int page_group, unsigned int mi_len, |
| 402 | uint8_t *mi, int chan_type) |
| 403 | { |
| 404 | return rsl_paging_cmd(bts, page_group, mi_len, mi, chan_type); |
| 405 | } |
| 406 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 407 | static void handle_ass_compl(struct gsm_subscriber_connection *conn, |
| 408 | struct msgb *msg) |
| 409 | { |
| 410 | struct gsm48_hdr *gh; |
| 411 | struct bsc_api *api = conn->bts->network->bsc_api; |
| 412 | |
| 413 | if (conn->secondary_lchan != msg->lchan) { |
| 414 | LOGP(DMSC, LOGL_ERROR, "Assignment Compl should occur on second lchan.\n"); |
| 415 | return; |
| 416 | } |
| 417 | |
| 418 | gh = msgb_l3(msg); |
| 419 | if (msgb_l3len(msg) - sizeof(*gh) != 1) { |
Harald Welte | 7b1d25a | 2015-01-01 12:32:03 +0100 | [diff] [blame] | 420 | LOGP(DMSC, LOGL_ERROR, "Assignment Compl invalid: %zu\n", |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 421 | msgb_l3len(msg) - sizeof(*gh)); |
| 422 | return; |
| 423 | } |
| 424 | |
Andreas Eversberg | dcf38e1 | 2013-12-05 14:37:11 +0100 | [diff] [blame] | 425 | /* switch TRAU muxer for E1 based BTS from one channel to another */ |
| 426 | if (is_e1_bts(conn->bts)) |
| 427 | switch_trau_mux(conn->lchan, conn->secondary_lchan); |
| 428 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 429 | /* swap channels */ |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 430 | osmo_timer_del(&conn->T10); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 431 | |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 432 | lchan_release(conn->lchan, 0, RSL_REL_LOCAL_END); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 433 | conn->lchan = conn->secondary_lchan; |
| 434 | conn->secondary_lchan = NULL; |
| 435 | |
| 436 | if (is_ipaccess_bts(conn->bts) && conn->lchan->tch_mode != GSM48_CMODE_SIGN) |
| 437 | rsl_ipacc_crcx(conn->lchan); |
| 438 | |
Holger Hans Peter Freyther | 40aac3f | 2011-12-27 12:31:02 +0100 | [diff] [blame] | 439 | api->assign_compl(conn, gh->data[0], |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 440 | lchan_to_chosen_channel(conn->lchan), |
| 441 | conn->lchan->encr.alg_id, |
| 442 | chan_mode_to_speech(conn->lchan)); |
| 443 | } |
| 444 | |
| 445 | static void handle_ass_fail(struct gsm_subscriber_connection *conn, |
| 446 | struct msgb *msg) |
| 447 | { |
| 448 | struct bsc_api *api = conn->bts->network->bsc_api; |
| 449 | uint8_t *rr_failure; |
| 450 | struct gsm48_hdr *gh; |
| 451 | |
| 452 | |
| 453 | if (conn->lchan != msg->lchan) { |
| 454 | LOGP(DMSC, LOGL_ERROR, "Assignment failure should occur on primary lchan.\n"); |
| 455 | return; |
| 456 | } |
| 457 | |
| 458 | /* stop the timer and release it */ |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 459 | osmo_timer_del(&conn->T10); |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 460 | lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 461 | conn->secondary_lchan = NULL; |
| 462 | |
| 463 | gh = msgb_l3(msg); |
| 464 | if (msgb_l3len(msg) - sizeof(*gh) != 1) { |
Harald Welte | 7b1d25a | 2015-01-01 12:32:03 +0100 | [diff] [blame] | 465 | LOGP(DMSC, LOGL_ERROR, "assignemnt failure unhandled: %zu\n", |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 466 | msgb_l3len(msg) - sizeof(*gh)); |
| 467 | rr_failure = NULL; |
| 468 | } else { |
| 469 | rr_failure = &gh->data[0]; |
| 470 | } |
| 471 | |
| 472 | api->assign_fail(conn, |
| 473 | GSM0808_CAUSE_RADIO_INTERFACE_MESSAGE_FAILURE, |
| 474 | rr_failure); |
| 475 | } |
| 476 | |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 477 | static void handle_classmark_chg(struct gsm_subscriber_connection *conn, |
| 478 | struct msgb *msg) |
| 479 | { |
| 480 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
| 481 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 482 | unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh); |
| 483 | uint8_t cm2_len, cm3_len = 0; |
| 484 | uint8_t *cm2, *cm3 = NULL; |
| 485 | |
| 486 | DEBUGP(DRR, "CLASSMARK CHANGE "); |
| 487 | |
| 488 | /* classmark 2 */ |
| 489 | cm2_len = gh->data[0]; |
| 490 | cm2 = &gh->data[1]; |
| 491 | DEBUGPC(DRR, "CM2(len=%u) ", cm2_len); |
| 492 | |
| 493 | if (payload_len > cm2_len + 1) { |
| 494 | /* we must have a classmark3 */ |
| 495 | if (gh->data[cm2_len+1] != 0x20) { |
| 496 | DEBUGPC(DRR, "ERR CM3 TAG\n"); |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 497 | return; |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 498 | } |
| 499 | if (cm2_len > 3) { |
| 500 | DEBUGPC(DRR, "CM2 too long!\n"); |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 501 | return; |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | cm3_len = gh->data[cm2_len+2]; |
| 505 | cm3 = &gh->data[cm2_len+3]; |
| 506 | if (cm3_len > 14) { |
| 507 | DEBUGPC(DRR, "CM3 len %u too long!\n", cm3_len); |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 508 | return; |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 509 | } |
| 510 | DEBUGPC(DRR, "CM3(len=%u)\n", cm3_len); |
| 511 | } |
| 512 | api->classmark_chg(conn, cm2, cm2_len, cm3, cm3_len); |
| 513 | } |
| 514 | |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 515 | /* Chapter 9.1.16 Handover complete */ |
| 516 | static void handle_rr_ho_compl(struct msgb *msg) |
| 517 | { |
| 518 | struct lchan_signal_data sig; |
| 519 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 520 | |
| 521 | DEBUGP(DRR, "HANDOVER COMPLETE cause = %s\n", |
| 522 | rr_cause_name(gh->data[0])); |
| 523 | |
| 524 | sig.lchan = msg->lchan; |
| 525 | sig.mr = NULL; |
| 526 | osmo_signal_dispatch(SS_LCHAN, S_LCHAN_HANDOVER_COMPL, &sig); |
| 527 | /* FIXME: release old channel */ |
| 528 | } |
| 529 | |
| 530 | /* Chapter 9.1.17 Handover Failure */ |
| 531 | static void handle_rr_ho_fail(struct msgb *msg) |
| 532 | { |
| 533 | struct lchan_signal_data sig; |
| 534 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 535 | |
| 536 | DEBUGP(DRR, "HANDOVER FAILED cause = %s\n", |
| 537 | rr_cause_name(gh->data[0])); |
| 538 | |
| 539 | sig.lchan = msg->lchan; |
| 540 | sig.mr = NULL; |
| 541 | osmo_signal_dispatch(SS_LCHAN, S_LCHAN_HANDOVER_FAIL, &sig); |
| 542 | /* FIXME: release allocated new channel */ |
| 543 | } |
| 544 | |
| 545 | |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 546 | static void dispatch_dtap(struct gsm_subscriber_connection *conn, |
| 547 | uint8_t link_id, struct msgb *msg) |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 548 | { |
| 549 | struct bsc_api *api = msg->lchan->ts->trx->bts->network->bsc_api; |
| 550 | struct gsm48_hdr *gh; |
| 551 | uint8_t pdisc; |
| 552 | int rc; |
| 553 | |
| 554 | if (msgb_l3len(msg) < sizeof(*gh)) { |
| 555 | LOGP(DMSC, LOGL_ERROR, "Message too short for a GSM48 header.\n"); |
| 556 | return; |
| 557 | } |
| 558 | |
| 559 | gh = msgb_l3(msg); |
| 560 | pdisc = gh->proto_discr & 0x0f; |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 561 | |
| 562 | /* the idea is to handle all RR messages here, and only hand |
| 563 | * MM/CC/SMS-CP/LCS up to the MSC. Some messages like PAGING |
| 564 | * RESPONSE or CM SERVICE REQUEST will not be covered here, as |
| 565 | * they are only possible in the first L3 message of each L2 |
| 566 | * channel, i.e. 'conn' will not exist and gsm0408_rcvmsg() |
| 567 | * will call api->compl_l3() for it */ |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 568 | switch (pdisc) { |
| 569 | case GSM48_PDISC_RR: |
| 570 | switch (gh->msg_type) { |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 571 | case GSM48_MT_RR_GPRS_SUSP_REQ: |
| 572 | DEBUGP(DRR, "GRPS SUSPEND REQUEST\n"); |
| 573 | break; |
| 574 | case GSM48_MT_RR_STATUS: |
Harald Welte | 0e9311d | 2012-04-26 19:35:27 +0200 | [diff] [blame] | 575 | LOGP(DRR, LOGL_NOTICE, "RR STATUS (cause: %s)\n", |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 576 | rr_cause_name(gh->data[0])); |
| 577 | break; |
| 578 | case GSM48_MT_RR_MEAS_REP: |
| 579 | /* This shouldn't actually end up here, as RSL treats |
| 580 | * L3 Info of 08.58 MEASUREMENT REPORT different by calling |
| 581 | * directly into gsm48_parse_meas_rep */ |
Harald Welte | 6e8dcf3 | 2012-04-26 19:35:58 +0200 | [diff] [blame] | 582 | LOGP(DMEAS, LOGL_ERROR, "DIRECT GSM48 MEASUREMENT REPORT ?!? "); |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 583 | break; |
| 584 | case GSM48_MT_RR_HANDO_COMPL: |
| 585 | handle_rr_ho_compl(msg); |
| 586 | break; |
| 587 | case GSM48_MT_RR_HANDO_FAIL: |
| 588 | handle_rr_ho_fail(msg); |
| 589 | break; |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 590 | case GSM48_MT_RR_CIPH_M_COMPL: |
| 591 | if (api->cipher_mode_compl) |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 592 | api->cipher_mode_compl(conn, msg, |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 593 | conn->lchan->encr.alg_id); |
| 594 | break; |
| 595 | case GSM48_MT_RR_ASS_COMPL: |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 596 | handle_ass_compl(conn, msg); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 597 | break; |
| 598 | case GSM48_MT_RR_ASS_FAIL: |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 599 | handle_ass_fail(conn, msg); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 600 | break; |
| 601 | case GSM48_MT_RR_CHAN_MODE_MODIF_ACK: |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 602 | osmo_timer_del(&conn->T10); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 603 | rc = gsm48_rx_rr_modif_ack(msg); |
Holger Hans Peter Freyther | 40aac3f | 2011-12-27 12:31:02 +0100 | [diff] [blame] | 604 | if (rc < 0) { |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 605 | api->assign_fail(conn, |
Holger Hans Peter Freyther | 45b575f | 2010-11-05 10:37:17 +0100 | [diff] [blame] | 606 | GSM0808_CAUSE_NO_RADIO_RESOURCE_AVAILABLE, |
| 607 | NULL); |
Holger Hans Peter Freyther | 40aac3f | 2011-12-27 12:31:02 +0100 | [diff] [blame] | 608 | } else if (rc >= 0) { |
Holger Hans Peter Freyther | b094171 | 2010-11-04 12:06:57 +0100 | [diff] [blame] | 609 | api->assign_compl(conn, 0, |
| 610 | lchan_to_chosen_channel(conn->lchan), |
| 611 | conn->lchan->encr.alg_id, |
| 612 | chan_mode_to_speech(conn->lchan)); |
Holger Hans Peter Freyther | 40aac3f | 2011-12-27 12:31:02 +0100 | [diff] [blame] | 613 | } |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 614 | break; |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 615 | case GSM48_MT_RR_CLSM_CHG: |
| 616 | handle_classmark_chg(conn, msg); |
Harald Welte | 95e862c | 2012-01-23 10:28:35 +0100 | [diff] [blame] | 617 | break; |
Harald Welte | ae1d010 | 2012-07-16 13:20:53 +0200 | [diff] [blame] | 618 | case GSM48_MT_RR_APP_INFO: |
| 619 | /* Passing RR APP INFO to MSC, not quite |
| 620 | * according to spec */ |
| 621 | if (api->dtap) |
| 622 | api->dtap(conn, link_id, msg); |
| 623 | break; |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 624 | default: |
| 625 | /* Normally, a MSC should never receive RR |
| 626 | * messages, but we'd rather forward what we |
| 627 | * don't know than drop it... */ |
| 628 | LOGP(DRR, LOGL_NOTICE, "BSC: Passing unknown 04.08 " |
| 629 | "RR message type 0x%02x to MSC\n", gh->msg_type); |
| 630 | if (api->dtap) |
| 631 | api->dtap(conn, link_id, msg); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 632 | } |
| 633 | break; |
Harald Welte | cf149ee | 2012-01-23 16:40:24 +0100 | [diff] [blame] | 634 | default: |
| 635 | if (api->dtap) |
| 636 | api->dtap(conn, link_id, msg); |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 637 | break; |
| 638 | } |
Holger Hans Peter Freyther | 6c199e7 | 2010-11-04 11:18:03 +0100 | [diff] [blame] | 639 | } |
| 640 | |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 641 | /*! \brief RSL has received a DATA INDICATION with L3 from MS */ |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 642 | int gsm0408_rcvmsg(struct msgb *msg, uint8_t link_id) |
| 643 | { |
| 644 | int rc; |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 645 | 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] | 646 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 647 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 648 | lchan = msg->lchan; |
Holger Hans Peter Freyther | 49ab278 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 649 | if (lchan->state != LCHAN_S_ACTIVE) { |
Harald Welte | 2cafc4b | 2010-12-24 13:06:11 +0100 | [diff] [blame] | 650 | LOGP(DRSL, LOGL_INFO, "Got data in non active state(%s), " |
| 651 | "discarding.\n", gsm_lchans_name(lchan->state)); |
Holger Hans Peter Freyther | 49ab278 | 2010-07-05 11:38:37 +0800 | [diff] [blame] | 652 | return -1; |
| 653 | } |
| 654 | |
| 655 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 656 | if (lchan->conn) { |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 657 | /* if we already have a connection, forward via DTAP to |
| 658 | * MSC */ |
Holger Hans Peter Freyther | 46caa30 | 2010-11-04 12:18:00 +0100 | [diff] [blame] | 659 | dispatch_dtap(lchan->conn, link_id, msg); |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 660 | } else { |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 661 | /* allocate a new connection */ |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 662 | rc = BSC_API_CONN_POL_REJECT; |
| 663 | lchan->conn = subscr_con_allocate(msg->lchan); |
Holger Hans Peter Freyther | 05bbec7 | 2011-01-16 18:15:26 +0100 | [diff] [blame] | 664 | if (!lchan->conn) { |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 665 | lchan_release(lchan, 1, RSL_REL_NORMAL); |
Holger Hans Peter Freyther | 05bbec7 | 2011-01-16 18:15:26 +0100 | [diff] [blame] | 666 | return -1; |
| 667 | } |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 668 | |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 669 | /* fwd via bsc_api to send COMPLETE L3 INFO to MSC */ |
Holger Hans Peter Freyther | 05bbec7 | 2011-01-16 18:15:26 +0100 | [diff] [blame] | 670 | rc = api->compl_l3(lchan->conn, msg, 0); |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 671 | |
| 672 | if (rc != BSC_API_CONN_POL_ACCEPT) { |
Holger Hans Peter Freyther | 8d216c7 | 2010-11-15 10:33:59 +0100 | [diff] [blame] | 673 | lchan->conn->lchan = NULL; |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 674 | subscr_con_free(lchan->conn); |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 675 | lchan_release(lchan, 1, RSL_REL_NORMAL); |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 676 | } |
Holger Hans Peter Freyther | 9764331 | 2010-06-17 16:41:25 +0800 | [diff] [blame] | 677 | } |
| 678 | |
| 679 | return 0; |
| 680 | } |
| 681 | |
Harald Welte | b70bd52 | 2011-09-13 00:02:09 +0100 | [diff] [blame] | 682 | /*! \brief We received a GSM 08.08 CIPHER MODE from the MSC */ |
Holger Hans Peter Freyther | dbc62db | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 683 | int gsm0808_cipher_mode(struct gsm_subscriber_connection *conn, int cipher, |
Holger Hans Peter Freyther | 2f169d6 | 2010-11-10 09:42:50 +0100 | [diff] [blame] | 684 | const uint8_t *key, int len, int include_imeisv) |
Holger Hans Peter Freyther | dbc62db | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 685 | { |
Holger Hans Peter Freyther | 4be7d41 | 2010-11-10 10:25:34 +0100 | [diff] [blame] | 686 | if (cipher > 0 && key == NULL) { |
| 687 | LOGP(DRSL, LOGL_ERROR, "Need to have an encrytpion key.\n"); |
| 688 | return -1; |
| 689 | } |
| 690 | |
| 691 | if (len > MAX_A5_KEY_LEN) { |
| 692 | LOGP(DRSL, LOGL_ERROR, "The key is too long: %d\n", len); |
| 693 | return -1; |
| 694 | } |
| 695 | |
| 696 | conn->lchan->encr.alg_id = RSL_ENC_ALG_A5(cipher); |
| 697 | if (key) { |
| 698 | conn->lchan->encr.key_len = len; |
| 699 | memcpy(conn->lchan->encr.key, key, len); |
| 700 | } |
| 701 | |
| 702 | return gsm48_send_rr_ciph_mode(conn->lchan, include_imeisv); |
Holger Hans Peter Freyther | dbc62db | 2010-07-23 16:55:24 +0800 | [diff] [blame] | 703 | } |
| 704 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 705 | /* |
| 706 | * Release all occupied RF Channels but stay around for more. |
| 707 | */ |
Holger Hans Peter Freyther | adb6e1c | 2010-09-18 06:44:24 +0800 | [diff] [blame] | 708 | int gsm0808_clear(struct gsm_subscriber_connection *conn) |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 709 | { |
Holger Hans Peter Freyther | 1f69b46 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 710 | if (conn->ho_lchan) |
Holger Hans Peter Freyther | ebd50a6 | 2010-12-27 13:46:48 +0100 | [diff] [blame] | 711 | bsc_clear_handover(conn, 1); |
Holger Hans Peter Freyther | d065165 | 2010-06-30 12:17:35 +0800 | [diff] [blame] | 712 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 713 | if (conn->secondary_lchan) |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 714 | lchan_release(conn->secondary_lchan, 0, RSL_REL_LOCAL_END); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 715 | |
Holger Hans Peter Freyther | abf962b | 2010-11-14 16:04:46 +0100 | [diff] [blame] | 716 | if (conn->lchan) |
Holger Hans Peter Freyther | d66777f | 2012-12-06 12:20:56 +0100 | [diff] [blame] | 717 | lchan_release(conn->lchan, 1, RSL_REL_NORMAL); |
Holger Hans Peter Freyther | 1f69b46 | 2010-09-16 22:49:37 +0800 | [diff] [blame] | 718 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 719 | conn->lchan = NULL; |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 720 | conn->secondary_lchan = NULL; |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 721 | conn->ho_lchan = NULL; |
| 722 | conn->bts = NULL; |
| 723 | |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 724 | osmo_timer_del(&conn->T10); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 725 | |
Holger Hans Peter Freyther | 4049455 | 2010-06-28 17:09:29 +0800 | [diff] [blame] | 726 | return 0; |
| 727 | } |
| 728 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 729 | static void send_sapi_reject(struct gsm_subscriber_connection *conn, int link_id) |
| 730 | { |
| 731 | struct bsc_api *api; |
| 732 | |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 733 | if (!conn) |
| 734 | return; |
| 735 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 736 | api = conn->bts->network->bsc_api; |
| 737 | if (!api || !api->sapi_n_reject) |
| 738 | return; |
| 739 | |
| 740 | api->sapi_n_reject(conn, link_id); |
| 741 | } |
| 742 | |
| 743 | static void rll_ind_cb(struct gsm_lchan *lchan, uint8_t link_id, void *_data, enum bsc_rllr_ind rllr_ind) |
| 744 | { |
| 745 | struct msgb *msg = _data; |
| 746 | |
Holger Hans Peter Freyther | 7e50c81 | 2010-11-10 10:59:05 +0100 | [diff] [blame] | 747 | /* |
| 748 | * There seems to be a small window that the RLL timer can |
| 749 | * fire after a lchan_release call and before the S_CHALLOC_FREED |
| 750 | * is called. Check if a conn is set before proceeding. |
| 751 | */ |
| 752 | if (!lchan->conn) |
| 753 | return; |
| 754 | |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 755 | switch (rllr_ind) { |
| 756 | case BSC_RLLR_IND_EST_CONF: |
| 757 | rsl_data_request(msg, OBSC_LINKID_CB(msg)); |
| 758 | break; |
| 759 | case BSC_RLLR_IND_REL_IND: |
| 760 | case BSC_RLLR_IND_ERR_IND: |
| 761 | case BSC_RLLR_IND_TIMEOUT: |
Holger Hans Peter Freyther | 2412a07 | 2010-06-28 15:47:12 +0800 | [diff] [blame] | 762 | send_sapi_reject(lchan->conn, OBSC_LINKID_CB(msg)); |
Holger Hans Peter Freyther | 9c595b7 | 2010-06-15 11:20:52 +0800 | [diff] [blame] | 763 | msgb_free(msg); |
| 764 | break; |
| 765 | } |
| 766 | } |
| 767 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 768 | static int bsc_handle_lchan_signal(unsigned int subsys, unsigned int signal, |
| 769 | void *handler_data, void *signal_data) |
| 770 | { |
| 771 | struct bsc_api *bsc; |
| 772 | struct gsm_lchan *lchan; |
Holger Hans Peter Freyther | 08eebd5 | 2010-12-27 13:28:20 +0100 | [diff] [blame] | 773 | struct lchan_signal_data *lchan_data; |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 774 | |
Holger Hans Peter Freyther | f05750c | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 775 | if (subsys != SS_LCHAN) |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 776 | return 0; |
| 777 | |
Holger Hans Peter Freyther | 9ae7b29 | 2010-12-27 12:30:12 +0100 | [diff] [blame] | 778 | |
Holger Hans Peter Freyther | 08eebd5 | 2010-12-27 13:28:20 +0100 | [diff] [blame] | 779 | lchan_data = signal_data; |
| 780 | if (!lchan_data->lchan || !lchan_data->lchan->conn) |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 781 | return 0; |
| 782 | |
Holger Hans Peter Freyther | 08eebd5 | 2010-12-27 13:28:20 +0100 | [diff] [blame] | 783 | lchan = lchan_data->lchan; |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 784 | bsc = lchan->ts->trx->bts->network->bsc_api; |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 785 | if (!bsc) |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 786 | return 0; |
| 787 | |
Holger Hans Peter Freyther | f05750c | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 788 | switch (signal) { |
| 789 | case S_LCHAN_UNEXPECTED_RELEASE: |
| 790 | handle_release(lchan->conn, bsc, lchan); |
| 791 | break; |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 792 | case S_LCHAN_ACTIVATE_ACK: |
| 793 | handle_chan_ack(lchan->conn, bsc, lchan); |
| 794 | break; |
| 795 | case S_LCHAN_ACTIVATE_NACK: |
| 796 | handle_chan_nack(lchan->conn, bsc, lchan); |
| 797 | break; |
Holger Hans Peter Freyther | f05750c | 2010-11-14 19:29:42 +0100 | [diff] [blame] | 798 | } |
| 799 | |
| 800 | return 0; |
| 801 | } |
| 802 | |
| 803 | static void handle_release(struct gsm_subscriber_connection *conn, |
| 804 | struct bsc_api *bsc, struct gsm_lchan *lchan) |
| 805 | { |
| 806 | int destruct = 1; |
| 807 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 808 | if (conn->secondary_lchan == lchan) { |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 809 | osmo_timer_del(&conn->T10); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 810 | conn->secondary_lchan = NULL; |
| 811 | |
| 812 | bsc->assign_fail(conn, |
| 813 | GSM0808_CAUSE_RADIO_INTERFACE_FAILURE, |
| 814 | NULL); |
| 815 | } |
| 816 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 817 | /* clear the connection now */ |
| 818 | if (bsc->clear_request) |
| 819 | destruct = bsc->clear_request(conn, 0); |
| 820 | |
Harald Welte | 6349b7f | 2010-12-26 22:12:53 +0100 | [diff] [blame] | 821 | /* now give up all channels */ |
| 822 | if (conn->lchan == lchan) |
| 823 | conn->lchan = NULL; |
Holger Hans Peter Freyther | ebd50a6 | 2010-12-27 13:46:48 +0100 | [diff] [blame] | 824 | if (conn->ho_lchan == lchan) { |
| 825 | bsc_clear_handover(conn, 0); |
Harald Welte | 6349b7f | 2010-12-26 22:12:53 +0100 | [diff] [blame] | 826 | conn->ho_lchan = NULL; |
Holger Hans Peter Freyther | ebd50a6 | 2010-12-27 13:46:48 +0100 | [diff] [blame] | 827 | } |
Harald Welte | 6349b7f | 2010-12-26 22:12:53 +0100 | [diff] [blame] | 828 | lchan->conn = NULL; |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 829 | |
Holger Hans Peter Freyther | aaa40b8 | 2010-09-16 20:48:15 +0800 | [diff] [blame] | 830 | gsm0808_clear(conn); |
| 831 | |
Holger Hans Peter Freyther | 05c6884 | 2010-11-03 19:01:58 +0100 | [diff] [blame] | 832 | if (destruct) |
| 833 | subscr_con_free(conn); |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 834 | } |
| 835 | |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 836 | static void handle_chan_ack(struct gsm_subscriber_connection *conn, |
| 837 | struct bsc_api *api, struct gsm_lchan *lchan) |
| 838 | { |
| 839 | if (conn->secondary_lchan != lchan) |
| 840 | return; |
| 841 | |
| 842 | LOGP(DMSC, LOGL_NOTICE, "Sending assignment on chan: %p\n", lchan); |
Dieter Spaar | 6b35377 | 2011-09-03 14:11:24 +0200 | [diff] [blame] | 843 | gsm48_send_rr_ass_cmd(conn->lchan, lchan, lchan->ms_power); |
Holger Hans Peter Freyther | 77cd95d | 2010-11-14 16:19:48 +0100 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | static void handle_chan_nack(struct gsm_subscriber_connection *conn, |
| 847 | struct bsc_api *api, struct gsm_lchan *lchan) |
| 848 | { |
| 849 | if (conn->secondary_lchan != lchan) |
| 850 | return; |
| 851 | |
| 852 | LOGP(DMSC, LOGL_ERROR, "Channel activation failed. Waiting for timeout now\n"); |
| 853 | conn->secondary_lchan->conn = NULL; |
| 854 | conn->secondary_lchan = NULL; |
| 855 | } |
| 856 | |
Holger Hans Peter Freyther | abcddf1 | 2010-06-14 18:20:15 +0800 | [diff] [blame] | 857 | static __attribute__((constructor)) void on_dso_load_bsc(void) |
| 858 | { |
Pablo Neira Ayuso | bbc5b99 | 2011-05-06 12:12:31 +0200 | [diff] [blame] | 859 | osmo_signal_register_handler(SS_LCHAN, bsc_handle_lchan_signal, NULL); |
Holger Hans Peter Freyther | 0cfbe26 | 2010-06-15 11:20:24 +0800 | [diff] [blame] | 860 | } |
Holger Hans Peter Freyther | 93dfa24 | 2014-08-08 21:06:30 +0200 | [diff] [blame] | 861 | |
| 862 | struct llist_head *bsc_api_sub_connections(struct gsm_network *net) |
| 863 | { |
| 864 | return &sub_connections; |
| 865 | } |