Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1 | /* Code to manage a subscriber's MSC-A role */ |
| 2 | /* |
| 3 | * (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de> |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * SPDX-License-Identifier: AGPL-3.0+ |
| 7 | * |
| 8 | * Author: Neels Hofmeyr |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU Affero General Public License as published by |
| 12 | * the Free Software Foundation; either version 3 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU Affero General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU Affero General Public License |
| 21 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 22 | */ |
| 23 | |
| 24 | #include <osmocom/core/utils.h> |
| 25 | #include <osmocom/core/tdef.h> |
| 26 | #include <osmocom/core/rate_ctr.h> |
| 27 | #include <osmocom/core/signal.h> |
| 28 | |
| 29 | #include <osmocom/msc/gsm_data.h> |
| 30 | #include <osmocom/msc/msc_roles.h> |
| 31 | #include <osmocom/msc/msub.h> |
| 32 | #include <osmocom/msc/msc_a.h> |
| 33 | #include <osmocom/msc/msc_t.h> |
| 34 | #include <osmocom/msc/msc_i.h> |
| 35 | #include <osmocom/msc/paging.h> |
| 36 | #include <osmocom/msc/signal.h> |
| 37 | #include <osmocom/msc/vlr.h> |
| 38 | #include <osmocom/msc/transaction.h> |
| 39 | #include <osmocom/msc/ran_peer.h> |
| 40 | #include <osmocom/msc/ran_msg_a.h> |
| 41 | #include <osmocom/msc/ran_msg_iu.h> |
| 42 | #include <osmocom/msc/sgs_iface.h> |
| 43 | #include <osmocom/msc/gsm_04_08.h> |
| 44 | #include <osmocom/msc/gsm_09_11.h> |
| 45 | #include <osmocom/msc/gsm_04_14.h> |
| 46 | #include <osmocom/msc/call_leg.h> |
| 47 | #include <osmocom/msc/rtp_stream.h> |
| 48 | #include <osmocom/msc/msc_ho.h> |
| 49 | |
| 50 | #define MSC_A_USE_WAIT_CLEAR_COMPLETE "wait-Clear-Complete" |
| 51 | |
| 52 | static struct osmo_fsm msc_a_fsm; |
| 53 | |
| 54 | static const struct osmo_tdef_state_timeout msc_a_fsm_timeouts[32] = { |
| 55 | [MSC_A_ST_VALIDATE_L3] = { .T = -1 }, |
| 56 | [MSC_A_ST_AUTH_CIPH] = { .keep_timer = true }, |
| 57 | [MSC_A_ST_WAIT_CLASSMARK_UPDATE] = { .keep_timer = true }, |
| 58 | [MSC_A_ST_AUTHENTICATED] = { .keep_timer = true }, |
| 59 | [MSC_A_ST_RELEASING] = { .T = -2 }, |
| 60 | [MSC_A_ST_RELEASED] = { .T = -2 }, |
| 61 | }; |
| 62 | |
| 63 | /* Transition to a state, using the T timer defined in msc_a_fsm_timeouts. |
| 64 | * The actual timeout value is in turn obtained from network->T_defs. |
| 65 | * Assumes local variable fi exists. */ |
Neels Hofmeyr | 0165325 | 2019-09-03 02:06:22 +0200 | [diff] [blame] | 66 | #define msc_a_state_chg_always(msc_a, state) \ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 67 | osmo_tdef_fsm_inst_state_chg((msc_a)->c.fi, state, msc_a_fsm_timeouts, (msc_a)->c.ran->tdefs, 5) |
| 68 | |
Neels Hofmeyr | 0165325 | 2019-09-03 02:06:22 +0200 | [diff] [blame] | 69 | /* Same as msc_a_state_chg_always() but ignore if the msc_a already is in the target state. */ |
| 70 | #define msc_a_state_chg(msc_a, STATE) do { \ |
| 71 | if ((msc_a)->c.fi->state != STATE) \ |
| 72 | msc_a_state_chg_always(msc_a, STATE); \ |
| 73 | } while(0) |
| 74 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 75 | struct gsm_network *msc_a_net(const struct msc_a *msc_a) |
| 76 | { |
| 77 | return msub_net(msc_a->c.msub); |
| 78 | } |
| 79 | |
| 80 | struct vlr_subscr *msc_a_vsub(const struct msc_a *msc_a) |
| 81 | { |
Neels Hofmeyr | 911e597 | 2019-05-09 13:28:26 +0200 | [diff] [blame] | 82 | if (!msc_a) |
| 83 | return NULL; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 84 | return msub_vsub(msc_a->c.msub); |
| 85 | } |
| 86 | |
| 87 | struct msc_i *msc_a_msc_i(const struct msc_a *msc_a) |
| 88 | { |
Neels Hofmeyr | 911e597 | 2019-05-09 13:28:26 +0200 | [diff] [blame] | 89 | if (!msc_a) |
| 90 | return NULL; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 91 | return msub_msc_i(msc_a->c.msub); |
| 92 | } |
| 93 | |
| 94 | struct msc_t *msc_a_msc_t(const struct msc_a *msc_a) |
| 95 | { |
Neels Hofmeyr | 911e597 | 2019-05-09 13:28:26 +0200 | [diff] [blame] | 96 | if (!msc_a) |
| 97 | return NULL; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 98 | return msub_msc_t(msc_a->c.msub); |
| 99 | } |
| 100 | |
| 101 | struct msc_a *msc_a_fi_priv(struct osmo_fsm_inst *fi) |
| 102 | { |
| 103 | OSMO_ASSERT(fi); |
| 104 | OSMO_ASSERT(fi->fsm == &msc_a_fsm); |
| 105 | OSMO_ASSERT(fi->priv); |
| 106 | return fi->priv; |
| 107 | } |
| 108 | |
| 109 | static void update_counters(struct osmo_fsm_inst *fi, bool conn_accepted) |
| 110 | { |
| 111 | struct msc_a *msc_a = fi->priv; |
| 112 | struct gsm_network *net = msc_a_net(msc_a); |
| 113 | switch (msc_a->complete_layer3_type) { |
| 114 | case COMPLETE_LAYER3_LU: |
| 115 | rate_ctr_inc(&net->msc_ctrs->ctr[ |
| 116 | conn_accepted ? MSC_CTR_LOC_UPDATE_COMPLETED |
| 117 | : MSC_CTR_LOC_UPDATE_FAILED]); |
| 118 | break; |
| 119 | case COMPLETE_LAYER3_CM_SERVICE_REQ: |
| 120 | rate_ctr_inc(&net->msc_ctrs->ctr[ |
| 121 | conn_accepted ? MSC_CTR_CM_SERVICE_REQUEST_ACCEPTED |
| 122 | : MSC_CTR_CM_SERVICE_REQUEST_REJECTED]); |
| 123 | break; |
| 124 | case COMPLETE_LAYER3_PAGING_RESP: |
| 125 | rate_ctr_inc(&net->msc_ctrs->ctr[ |
| 126 | conn_accepted ? MSC_CTR_PAGING_RESP_ACCEPTED |
| 127 | : MSC_CTR_PAGING_RESP_REJECTED]); |
| 128 | break; |
| 129 | default: |
| 130 | break; |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | static void evaluate_acceptance_outcome(struct osmo_fsm_inst *fi, bool conn_accepted) |
| 135 | { |
| 136 | struct msc_a *msc_a = fi->priv; |
| 137 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 138 | |
| 139 | update_counters(fi, conn_accepted); |
| 140 | |
Neels Hofmeyr | 83cf10c | 2020-06-24 14:23:26 +0200 | [diff] [blame] | 141 | if (conn_accepted) { |
| 142 | /* Record the Cell ID seen in Complete Layer 3 Information in the VLR, so that it also shows in vty |
| 143 | * 'show' output. */ |
| 144 | vsub->cgi = msc_a->via_cell; |
| 145 | } |
| 146 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 147 | /* Trigger transactions that we paged for */ |
| 148 | if (msc_a->complete_layer3_type == COMPLETE_LAYER3_PAGING_RESP) { |
| 149 | if (conn_accepted) |
| 150 | paging_response(msc_a); |
| 151 | else |
| 152 | paging_expired(vsub); |
| 153 | } |
| 154 | |
| 155 | if (conn_accepted) |
| 156 | osmo_signal_dispatch(SS_SUBSCR, S_SUBSCR_ATTACHED, msc_a_vsub(msc_a)); |
| 157 | |
| 158 | if (msc_a->complete_layer3_type == COMPLETE_LAYER3_LU) |
| 159 | msc_a_put(msc_a, MSC_A_USE_LOCATION_UPDATING); |
| 160 | } |
| 161 | |
| 162 | bool msc_a_is_accepted(const struct msc_a *msc_a) |
| 163 | { |
| 164 | if (!msc_a || !msc_a->c.fi) |
| 165 | return false; |
| 166 | return msc_a->c.fi->state == MSC_A_ST_AUTHENTICATED |
| 167 | || msc_a->c.fi->state == MSC_A_ST_COMMUNICATING; |
| 168 | } |
| 169 | |
| 170 | bool msc_a_in_release(struct msc_a *msc_a) |
| 171 | { |
| 172 | if (!msc_a) |
| 173 | return true; |
| 174 | if (msc_a->c.fi->state == MSC_A_ST_RELEASING) |
| 175 | return true; |
| 176 | if (msc_a->c.fi->state == MSC_A_ST_RELEASED) |
| 177 | return true; |
| 178 | return false; |
| 179 | } |
| 180 | |
| 181 | static int msc_a_ran_dec(struct msc_a *msc_a, const struct an_apdu *an_apdu, enum msc_role from_role) |
| 182 | { |
| 183 | int rc; |
| 184 | struct msc_a_ran_dec_data d = { |
| 185 | .from_role = from_role, |
| 186 | .an_apdu = an_apdu, |
| 187 | }; |
| 188 | msc_a_get(msc_a, __func__); |
| 189 | rc = msc_role_ran_decode(msc_a->c.fi, an_apdu, msc_a_ran_decode_cb, &d); |
| 190 | msc_a_put(msc_a, __func__); |
| 191 | return rc; |
| 192 | }; |
| 193 | |
| 194 | static void msc_a_fsm_validate_l3(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 195 | { |
| 196 | struct msc_a *msc_a = fi->priv; |
| 197 | const struct an_apdu *an_apdu; |
| 198 | |
| 199 | switch (event) { |
| 200 | case MSC_A_EV_FROM_I_COMPLETE_LAYER_3: |
| 201 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 202 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 203 | an_apdu = data; |
| 204 | msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_I); |
| 205 | return; |
| 206 | |
| 207 | case MSC_A_EV_COMPLETE_LAYER_3_OK: |
| 208 | msc_a_state_chg(msc_a, MSC_A_ST_AUTH_CIPH); |
| 209 | return; |
| 210 | |
| 211 | case MSC_A_EV_MO_CLOSE: |
| 212 | case MSC_A_EV_CN_CLOSE: |
| 213 | evaluate_acceptance_outcome(fi, false); |
| 214 | /* fall through */ |
| 215 | case MSC_A_EV_UNUSED: |
| 216 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 217 | return; |
| 218 | |
| 219 | default: |
| 220 | OSMO_ASSERT(false); |
| 221 | } |
| 222 | } |
| 223 | |
| 224 | /* Figure out whether to first send a Classmark Request to the MS to figure out algorithm support. */ |
| 225 | static bool msc_a_need_classmark_for_ciphering(struct msc_a *msc_a) |
| 226 | { |
| 227 | struct gsm_network *net = msc_a_net(msc_a); |
| 228 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 229 | int i = 0; |
| 230 | bool request_classmark = false; |
| 231 | |
| 232 | /* Only on GERAN-A do we ever need Classmark Information for Ciphering. */ |
| 233 | if (msc_a->c.ran->type != OSMO_RAT_GERAN_A) |
| 234 | return false; |
| 235 | |
| 236 | for (i = 0; i < 8; i++) { |
| 237 | int supported; |
| 238 | |
| 239 | /* A5/n permitted by osmo-msc.cfg? */ |
| 240 | if (!(net->a5_encryption_mask & (1 << i))) |
| 241 | continue; |
| 242 | |
| 243 | /* A5/n supported by MS? */ |
| 244 | supported = osmo_gsm48_classmark_supports_a5(&vsub->classmark, i); |
| 245 | if (supported < 0) { |
| 246 | LOG_MSC_A(msc_a, LOGL_DEBUG, "For A5/%d, we still need Classmark %d\n", i, -supported); |
| 247 | request_classmark = true; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | return request_classmark; |
| 252 | } |
| 253 | |
| 254 | static int msc_a_ran_enc_ciphering(struct msc_a *msc_a, bool umts_aka, bool retrieve_imeisv); |
| 255 | |
| 256 | /* VLR callback for ops.set_ciph_mode() */ |
| 257 | int msc_a_vlr_set_cipher_mode(void *_msc_a, bool umts_aka, bool retrieve_imeisv) |
| 258 | { |
| 259 | struct msc_a *msc_a = _msc_a; |
Vadim Yanitskiy | 4dd477f | 2019-05-11 03:00:30 +0700 | [diff] [blame] | 260 | struct vlr_subscr *vsub; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 261 | |
Vadim Yanitskiy | 4dd477f | 2019-05-11 03:00:30 +0700 | [diff] [blame] | 262 | if (!msc_a) { |
| 263 | LOGP(DMSC, LOGL_ERROR, "Insufficient info to start ciphering: " |
| 264 | "MSC-A role is NULL?!?\n"); |
| 265 | return -EINVAL; |
| 266 | } |
| 267 | |
| 268 | vsub = msc_a_vsub(msc_a); |
| 269 | if (!vsub || !vsub->last_tuple) { |
| 270 | LOG_MSC_A(msc_a, LOGL_ERROR, "Insufficient info to start ciphering: " |
| 271 | "vlr_subscr is NULL?!?\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 272 | return -EINVAL; |
| 273 | } |
| 274 | |
| 275 | if (msc_a_need_classmark_for_ciphering(msc_a)) { |
| 276 | int rc; |
| 277 | struct ran_msg msg = { |
| 278 | .msg_type = RAN_MSG_CLASSMARK_REQUEST, |
| 279 | }; |
| 280 | rc = msc_a_ran_down(msc_a, MSC_ROLE_I, &msg); |
| 281 | if (rc) { |
| 282 | LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot send Classmark Request\n"); |
| 283 | return -EIO; |
| 284 | } |
| 285 | |
| 286 | msc_a->state_before_classmark_update = msc_a->c.fi->state; |
| 287 | msc_a->action_on_classmark_update = (struct msc_a_action_on_classmark_update){ |
| 288 | .type = MSC_A_CLASSMARK_UPDATE_THEN_CIPHERING, |
| 289 | .ciphering = { |
| 290 | .umts_aka = umts_aka, |
| 291 | .retrieve_imeisv = retrieve_imeisv, |
| 292 | }, |
| 293 | }; |
| 294 | msc_a_state_chg(msc_a, MSC_A_ST_WAIT_CLASSMARK_UPDATE); |
| 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | return msc_a_ran_enc_ciphering(msc_a, umts_aka, retrieve_imeisv); |
| 299 | } |
| 300 | |
| 301 | static int msc_a_ran_enc_ciphering(struct msc_a *msc_a, bool umts_aka, bool retrieve_imeisv) |
| 302 | { |
Vadim Yanitskiy | 4dd477f | 2019-05-11 03:00:30 +0700 | [diff] [blame] | 303 | struct gsm_network *net; |
| 304 | struct vlr_subscr *vsub; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 305 | struct ran_msg msg; |
| 306 | |
Vadim Yanitskiy | 4dd477f | 2019-05-11 03:00:30 +0700 | [diff] [blame] | 307 | if (!msc_a) { |
| 308 | LOGP(DMSC, LOGL_ERROR, "Insufficient info to start ciphering: " |
| 309 | "MSC-A role is NULL?!?\n"); |
| 310 | return -EINVAL; |
| 311 | } |
| 312 | |
| 313 | net = msc_a_net(msc_a); |
| 314 | vsub = msc_a_vsub(msc_a); |
| 315 | |
| 316 | if (!net || !vsub || !vsub->last_tuple) { |
| 317 | LOG_MSC_A(msc_a, LOGL_ERROR, "Insufficient info to start ciphering: " |
| 318 | "gsm_network and/or vlr_subscr is NULL?!?\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 319 | return -EINVAL; |
| 320 | } |
| 321 | |
| 322 | msg = (struct ran_msg){ |
| 323 | .msg_type = RAN_MSG_CIPHER_MODE_COMMAND, |
| 324 | .cipher_mode_command = { |
| 325 | .vec = vsub->last_tuple ? &vsub->last_tuple->vec : NULL, |
| 326 | .classmark = &vsub->classmark, |
| 327 | .geran = { |
| 328 | .umts_aka = umts_aka, |
| 329 | .retrieve_imeisv = retrieve_imeisv, |
| 330 | .a5_encryption_mask = net->a5_encryption_mask, |
| 331 | |
| 332 | /* for ran_a.c to store the GERAN key that is actually used */ |
| 333 | .chosen_key = &msc_a->geran_encr, |
| 334 | }, |
| 335 | }, |
| 336 | }; |
| 337 | |
| 338 | if (msc_a_ran_down(msc_a, MSC_ROLE_I, &msg)) { |
| 339 | LOG_MSC_A(msc_a, LOGL_ERROR, "Sending Cipher Mode Command failed\n"); |
| 340 | /* Returning error to the VLR ops.set_ciph_mode() will cancel the attach. Other callers need to take |
| 341 | * care of the return value. */ |
| 342 | return -EINVAL; |
| 343 | } |
| 344 | |
| 345 | if (msc_a->geran_encr.key_len) |
| 346 | LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN encoding chose ciphering key %s\n", |
| 347 | osmo_hexdump_nospc(msc_a->geran_encr.key, msc_a->geran_encr.key_len)); |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | static void msc_a_fsm_auth_ciph(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 352 | { |
| 353 | struct msc_a *msc_a = fi->priv; |
| 354 | |
| 355 | /* If accepted, transition the state, all other cases mean failure. */ |
| 356 | switch (event) { |
| 357 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 358 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 359 | msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| 360 | return; |
| 361 | |
| 362 | case MSC_A_EV_AUTHENTICATED: |
| 363 | msc_a_state_chg(msc_a, MSC_A_ST_AUTHENTICATED); |
| 364 | return; |
| 365 | |
| 366 | case MSC_A_EV_UNUSED: |
| 367 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 368 | return; |
| 369 | |
| 370 | case MSC_A_EV_MO_CLOSE: |
| 371 | case MSC_A_EV_CN_CLOSE: |
| 372 | evaluate_acceptance_outcome(fi, false); |
| 373 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 374 | return; |
| 375 | |
| 376 | |
| 377 | default: |
| 378 | OSMO_ASSERT(false); |
| 379 | } |
| 380 | } |
| 381 | |
| 382 | static void msc_a_fsm_wait_classmark_update(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 383 | { |
| 384 | struct msc_a *msc_a = fi->priv; |
| 385 | |
| 386 | switch (event) { |
| 387 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 388 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 389 | msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| 390 | return; |
| 391 | |
| 392 | case MSC_A_EV_CLASSMARK_UPDATE: |
| 393 | switch (msc_a->action_on_classmark_update.type) { |
| 394 | case MSC_A_CLASSMARK_UPDATE_THEN_CIPHERING: |
| 395 | msc_a_state_chg(msc_a, MSC_A_ST_AUTH_CIPH); |
| 396 | if (msc_a_ran_enc_ciphering(msc_a, |
| 397 | msc_a->action_on_classmark_update.ciphering.umts_aka, |
| 398 | msc_a->action_on_classmark_update.ciphering.retrieve_imeisv)) { |
| 399 | LOG_MSC_A(msc_a, LOGL_ERROR, |
| 400 | "After Classmark Update, still failed to send Cipher Mode Command\n"); |
| 401 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 402 | } |
| 403 | return; |
| 404 | |
| 405 | default: |
| 406 | LOG_MSC_A(msc_a, LOGL_ERROR, "Internal error: After Classmark Update, don't know what to do\n"); |
| 407 | msc_a_state_chg(msc_a, msc_a->state_before_classmark_update); |
| 408 | return; |
| 409 | } |
| 410 | |
| 411 | case MSC_A_EV_UNUSED: |
| 412 | /* Seems something detached / aborted in the middle of auth+ciph. */ |
| 413 | evaluate_acceptance_outcome(fi, false); |
| 414 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 415 | return; |
| 416 | |
| 417 | case MSC_A_EV_MO_CLOSE: |
| 418 | case MSC_A_EV_CN_CLOSE: |
| 419 | evaluate_acceptance_outcome(fi, false); |
| 420 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 421 | return; |
| 422 | |
| 423 | default: |
| 424 | OSMO_ASSERT(false); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | static bool msc_a_fsm_has_active_transactions(struct osmo_fsm_inst *fi) |
| 429 | { |
| 430 | struct msc_a *msc_a = fi->priv; |
| 431 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 432 | struct gsm_trans *trans; |
| 433 | |
| 434 | if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_SILENT_CALL)) { |
| 435 | LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: silent call still active\n", __func__); |
| 436 | return true; |
| 437 | } |
| 438 | |
| 439 | if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_CC)) { |
| 440 | LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO CC request after a CM Service Request\n", |
| 441 | __func__); |
| 442 | return true; |
| 443 | } |
| 444 | if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_SMS)) { |
| 445 | LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO SMS after a CM Service Request\n", |
| 446 | __func__); |
| 447 | return true; |
| 448 | } |
| 449 | if (osmo_use_count_by(&msc_a->use_count, MSC_A_USE_CM_SERVICE_SS)) { |
| 450 | LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still awaiting MO SS after a CM Service Request\n", |
| 451 | __func__); |
| 452 | return true; |
| 453 | } |
| 454 | |
| 455 | if (vsub && !llist_empty(&vsub->cs.requests)) { |
| 456 | struct paging_request *pr; |
| 457 | llist_for_each_entry(pr, &vsub->cs.requests, entry) { |
| 458 | LOG_MSC_A(msc_a, LOGL_DEBUG, "%s: still active: %s\n", __func__, pr->label); |
| 459 | } |
| 460 | return true; |
| 461 | } |
| 462 | |
| 463 | if ((trans = trans_has_conn(msc_a))) { |
| 464 | LOG_MSC_A(msc_a, LOGL_DEBUG, "connection still has active transaction: %s\n", |
| 465 | trans_type_name(trans->type)); |
| 466 | return true; |
| 467 | } |
| 468 | |
| 469 | return false; |
| 470 | } |
| 471 | |
| 472 | static void msc_a_fsm_authenticated_enter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 473 | { |
| 474 | struct msc_a *msc_a = fi->priv; |
| 475 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 476 | |
| 477 | /* Stop Location Update expiry for this subscriber. While the subscriber |
| 478 | * has an open connection the LU expiry timer must remain disabled. |
| 479 | * Otherwise we would kick the subscriber off the network when the timer |
| 480 | * expires e.g. during a long phone call. |
| 481 | * The LU expiry timer will restart once the connection is closed. */ |
| 482 | if (vsub) |
| 483 | vsub->expire_lu = VLR_SUBSCRIBER_NO_EXPIRATION; |
| 484 | |
| 485 | evaluate_acceptance_outcome(fi, true); |
| 486 | } |
| 487 | |
| 488 | static void msc_a_fsm_authenticated(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 489 | { |
| 490 | struct msc_a *msc_a = fi->priv; |
| 491 | |
| 492 | switch (event) { |
| 493 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 494 | case MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST: |
| 495 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 496 | msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| 497 | return; |
| 498 | |
| 499 | case MSC_A_EV_COMPLETE_LAYER_3_OK: |
| 500 | /* When Authentication is off, we may already be in the Accepted state when the code |
| 501 | * evaluates the Compl L3. Simply ignore. This just cosmetically mutes the error log |
| 502 | * about the useless event. */ |
| 503 | return; |
| 504 | |
| 505 | case MSC_A_EV_TRANSACTION_ACCEPTED: |
| 506 | msc_a_state_chg(msc_a, MSC_A_ST_COMMUNICATING); |
| 507 | return; |
| 508 | |
| 509 | case MSC_A_EV_MO_CLOSE: |
| 510 | case MSC_A_EV_CN_CLOSE: |
| 511 | case MSC_A_EV_UNUSED: |
| 512 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 513 | return; |
| 514 | |
| 515 | default: |
| 516 | OSMO_ASSERT(false); |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | /* The MGW has given us a local IP address for the RAN side. Ready to start the Assignment of a voice channel. */ |
| 521 | static void msc_a_call_leg_ran_local_addr_available(struct msc_a *msc_a) |
| 522 | { |
| 523 | struct ran_msg msg; |
| 524 | struct gsm_trans *cc_trans = msc_a->cc.active_trans; |
| 525 | struct gsm0808_channel_type channel_type; |
| 526 | |
Neels Hofmeyr | 00a476b | 2019-11-28 02:46:05 +0100 | [diff] [blame] | 527 | if (!cc_trans) { |
| 528 | LOG_MSC_A(msc_a, LOGL_ERROR, "No CC transaction active\n"); |
| 529 | call_leg_release(msc_a->cc.call_leg); |
| 530 | return; |
| 531 | } |
| 532 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 533 | /* Once a CI is known, we could also CRCX the CN side of the MGW endpoint, but it makes sense to wait for the |
| 534 | * codec to be determined by the Assignment Complete message, first. */ |
| 535 | |
| 536 | if (mncc_bearer_cap_to_channel_type(&channel_type, &cc_trans->bearer_cap)) { |
| 537 | LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot compose Channel Type from bearer capabilities\n"); |
Neels Hofmeyr | f439ff1 | 2019-10-05 04:19:36 +0200 | [diff] [blame] | 538 | trans_free(cc_trans); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 539 | return; |
| 540 | } |
| 541 | |
| 542 | /* The RAN side RTP address is known, so the voice Assignment can commence. */ |
| 543 | msg = (struct ran_msg){ |
| 544 | .msg_type = RAN_MSG_ASSIGNMENT_COMMAND, |
| 545 | .assignment_command = { |
| 546 | .cn_rtp = &msc_a->cc.call_leg->rtp[RTP_TO_RAN]->local, |
| 547 | .channel_type = &channel_type, |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 548 | .osmux_present = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->use_osmux, |
| 549 | .osmux_cid = msc_a->cc.call_leg->rtp[RTP_TO_RAN]->local_osmux_cid, |
Philipp Maier | f34d945 | 2020-06-05 15:49:35 +0200 | [diff] [blame] | 550 | .call_id_present = true, |
| 551 | .call_id = cc_trans->callref, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 552 | }, |
| 553 | }; |
| 554 | if (msc_a_ran_down(msc_a, MSC_ROLE_I, &msg)) { |
| 555 | LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot send Assignment\n"); |
Neels Hofmeyr | f439ff1 | 2019-10-05 04:19:36 +0200 | [diff] [blame] | 556 | trans_free(cc_trans); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 557 | return; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | static void msc_a_call_leg_cn_local_addr_available(struct msc_a *msc_a, struct gsm_trans *cc_trans) |
| 562 | { |
| 563 | if (gsm48_tch_rtp_create(cc_trans)) { |
| 564 | LOG_MSC_A(msc_a, LOGL_ERROR, "Cannot inform MNCC of RTP address\n"); |
Neels Hofmeyr | f439ff1 | 2019-10-05 04:19:36 +0200 | [diff] [blame] | 565 | trans_free(cc_trans); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 566 | return; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | static struct gsm_trans *find_waiting_call(struct msc_a *msc_a) |
| 571 | { |
| 572 | struct gsm_trans *trans; |
| 573 | struct gsm_network *net = msc_a_net(msc_a); |
| 574 | |
| 575 | llist_for_each_entry(trans, &net->trans_list, entry) { |
| 576 | if (trans->msc_a != msc_a) |
| 577 | continue; |
| 578 | if (trans->type != TRANS_CC) |
| 579 | continue; |
| 580 | if (trans->msc_a->cc.active_trans == trans) |
| 581 | continue; |
| 582 | return trans; |
| 583 | } |
| 584 | return NULL; |
| 585 | } |
| 586 | |
| 587 | static void msc_a_cleanup_rtp_streams(struct msc_a *msc_a, uint32_t event, void *data) |
| 588 | { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 589 | switch (event) { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 590 | |
| 591 | case MSC_EV_CALL_LEG_TERM: |
| 592 | msc_a->cc.call_leg = NULL; |
| 593 | if (msc_a->cc.mncc_forwarding_to_remote_ran) |
| 594 | msc_a->cc.mncc_forwarding_to_remote_ran->rtps = NULL; |
| 595 | |
Neels Hofmeyr | 265a4c7 | 2019-05-09 16:20:51 +0200 | [diff] [blame] | 596 | if (msc_a->ho.new_cell.mncc_forwarding_to_remote_ran) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 597 | msc_a->ho.new_cell.mncc_forwarding_to_remote_ran->rtps = NULL; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 598 | return; |
| 599 | |
| 600 | case MSC_MNCC_EV_CALL_ENDED: |
| 601 | msc_a->cc.mncc_forwarding_to_remote_ran = NULL; |
| 602 | return; |
| 603 | |
| 604 | default: |
| 605 | return; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | static void msc_a_fsm_communicating(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 610 | { |
| 611 | struct msc_a *msc_a = fi->priv; |
| 612 | struct rtp_stream *rtps; |
| 613 | struct gsm_trans *waiting_trans; |
| 614 | struct an_apdu *an_apdu; |
| 615 | |
| 616 | msc_a_cleanup_rtp_streams(msc_a, event, data); |
| 617 | |
| 618 | switch (event) { |
| 619 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 620 | case MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST: |
| 621 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 622 | an_apdu = data; |
| 623 | msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_I); |
| 624 | return; |
| 625 | |
| 626 | case MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE: |
| 627 | case MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE: |
| 628 | case MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 629 | case MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST: |
| 630 | an_apdu = data; |
| 631 | msc_a_ran_dec(msc_a, an_apdu, MSC_ROLE_T); |
| 632 | return; |
| 633 | |
| 634 | case MSC_A_EV_TRANSACTION_ACCEPTED: |
| 635 | /* no-op */ |
| 636 | return; |
| 637 | |
| 638 | case MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE: |
| 639 | rtps = data; |
| 640 | if (!rtps) { |
| 641 | LOG_MSC_A(msc_a, LOGL_ERROR, "Invalid data for %s\n", osmo_fsm_event_name(fi->fsm, event)); |
| 642 | return; |
| 643 | } |
Neels Hofmeyr | 00a476b | 2019-11-28 02:46:05 +0100 | [diff] [blame] | 644 | if (!msc_a->cc.call_leg) { |
| 645 | LOG_MSC_A(msc_a, LOGL_ERROR, "No call leg active\n"); |
| 646 | return; |
| 647 | } |
Neels Hofmeyr | cc918cb | 2019-11-28 02:16:34 +0100 | [diff] [blame] | 648 | if (!osmo_sockaddr_str_is_nonzero(&rtps->local)) { |
| 649 | LOG_MSC_A(msc_a, LOGL_ERROR, "Invalid RTP address received from MGW: " OSMO_SOCKADDR_STR_FMT "\n", |
| 650 | OSMO_SOCKADDR_STR_FMT_ARGS(&rtps->local)); |
| 651 | call_leg_release(msc_a->cc.call_leg); |
| 652 | return; |
| 653 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 654 | LOG_MSC_A(msc_a, LOGL_DEBUG, |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 655 | "MGW endpoint's RTP address available for the CI %s: " OSMO_SOCKADDR_STR_FMT " (osmux=%s:%d)\n", |
| 656 | rtp_direction_name(rtps->dir), OSMO_SOCKADDR_STR_FMT_ARGS(&rtps->local), |
| 657 | rtps->use_osmux ? "yes" : "no", rtps->local_osmux_cid); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 658 | switch (rtps->dir) { |
| 659 | case RTP_TO_RAN: |
| 660 | msc_a_call_leg_ran_local_addr_available(msc_a); |
| 661 | return; |
| 662 | case RTP_TO_CN: |
| 663 | msc_a_call_leg_cn_local_addr_available(msc_a, rtps->for_trans); |
| 664 | return; |
| 665 | default: |
| 666 | LOG_MSC_A(msc_a, LOGL_ERROR, "Invalid data for %s\n", osmo_fsm_event_name(fi->fsm, event)); |
| 667 | return; |
| 668 | } |
| 669 | |
| 670 | case MSC_EV_CALL_LEG_RTP_COMPLETE: |
| 671 | /* Nothing to do. */ |
| 672 | return; |
| 673 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 674 | case MSC_MNCC_EV_CALL_ENDED: |
| 675 | /* Cleaned up above */ |
| 676 | return; |
| 677 | |
| 678 | case MSC_EV_CALL_LEG_TERM: |
| 679 | /* RTP streams cleaned up above */ |
| 680 | |
| 681 | msc_a_get(msc_a, __func__); |
| 682 | if (msc_a->cc.active_trans) |
| 683 | trans_free(msc_a->cc.active_trans); |
| 684 | |
| 685 | /* If there is another call still waiting to be activated, this is the time when the mgcp_ctx is |
| 686 | * available again and the other call can start assigning. */ |
| 687 | waiting_trans = find_waiting_call(msc_a); |
| 688 | if (waiting_trans) { |
| 689 | LOG_MSC_A(msc_a, LOGL_DEBUG, "(ti %02x) Call waiting: starting Assignment\n", |
| 690 | waiting_trans->transaction_id); |
| 691 | msc_a_try_call_assignment(waiting_trans); |
| 692 | } |
| 693 | msc_a_put(msc_a, __func__); |
| 694 | return; |
| 695 | |
| 696 | case MSC_A_EV_HANDOVER_REQUIRED: |
| 697 | msc_ho_start(msc_a, (struct ran_handover_required*)data); |
| 698 | return; |
| 699 | |
Neels Hofmeyr | 0a437be | 2019-05-10 15:55:52 +0200 | [diff] [blame] | 700 | case MSC_A_EV_HANDOVER_END: |
| 701 | /* Termination event of the msc_ho_fsm. No action needed, it's all done in the msc_ho_fsm cleanup. This |
| 702 | * event only exists because osmo_fsm_inst_alloc_child() requires a parent term event; and maybe |
| 703 | * interesting for logging. */ |
| 704 | return; |
| 705 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 706 | case MSC_A_EV_MO_CLOSE: |
| 707 | case MSC_A_EV_CN_CLOSE: |
| 708 | case MSC_A_EV_UNUSED: |
| 709 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 710 | return; |
| 711 | |
| 712 | default: |
| 713 | OSMO_ASSERT(false); |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | static int msc_a_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 718 | { |
| 719 | struct msc_a *msc_a = fi->priv; |
| 720 | if (msc_a_in_release(msc_a)) { |
| 721 | LOG_MSC_A(msc_a, LOGL_ERROR, "Timeout while releasing, discarding right now\n"); |
| 722 | msc_a_put_all(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| 723 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| 724 | } else { |
| 725 | enum gsm48_reject_value cause = GSM48_REJECT_CONGESTION; |
| 726 | osmo_fsm_inst_dispatch(fi, MSC_A_EV_CN_CLOSE, &cause); |
| 727 | } |
| 728 | return 0; |
| 729 | } |
| 730 | |
| 731 | static void msc_a_fsm_releasing_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 732 | { |
| 733 | struct msc_a *msc_a = fi->priv; |
| 734 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 735 | int i; |
| 736 | char buf[128]; |
| 737 | const char * const use_counts_to_cancel[] = { |
| 738 | MSC_A_USE_LOCATION_UPDATING, |
| 739 | MSC_A_USE_CM_SERVICE_CC, |
| 740 | MSC_A_USE_CM_SERVICE_SMS, |
| 741 | MSC_A_USE_CM_SERVICE_SS, |
| 742 | MSC_A_USE_PAGING_RESPONSE, |
| 743 | }; |
| 744 | |
| 745 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Releasing: msc_a use is %s\n", |
| 746 | osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| 747 | |
| 748 | if (vsub) { |
| 749 | vlr_subscr_get(vsub, __func__); |
| 750 | |
| 751 | /* Cancel all VLR FSMs, if any */ |
| 752 | vlr_subscr_cancel_attach_fsm(vsub, OSMO_FSM_TERM_ERROR, GSM48_REJECT_CONGESTION); |
| 753 | |
| 754 | /* The subscriber has no active connection anymore. |
| 755 | * Restart the periodic Location Update expiry timer for this subscriber. */ |
| 756 | vlr_subscr_enable_expire_lu(vsub); |
| 757 | } |
| 758 | |
| 759 | /* If we're closing in a middle of a trans, we need to clean up */ |
| 760 | trans_conn_closed(msc_a); |
| 761 | |
| 762 | call_leg_release(msc_a->cc.call_leg); |
| 763 | |
| 764 | /* Cancel use counts for pending CM Service / Paging */ |
| 765 | for (i = 0; i < ARRAY_SIZE(use_counts_to_cancel); i++) { |
| 766 | const char *use = use_counts_to_cancel[i]; |
| 767 | int32_t count = osmo_use_count_by(&msc_a->use_count, use); |
| 768 | if (!count) |
| 769 | continue; |
| 770 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Releasing: canceling still pending use: %s (%d)\n", use, count); |
| 771 | osmo_use_count_get_put(&msc_a->use_count, use, -count); |
| 772 | } |
| 773 | |
| 774 | if (msc_a->c.ran->type == OSMO_RAT_EUTRAN_SGS) { |
| 775 | sgs_iface_tx_release(vsub); |
| 776 | /* In SGsAP there is no confirmation of a release. */ |
| 777 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| 778 | } else { |
| 779 | struct ran_msg msg = { |
| 780 | .msg_type = RAN_MSG_CLEAR_COMMAND, |
| 781 | .clear_command = { |
Neels Hofmeyr | d9fe711 | 2020-07-11 00:20:20 +0200 | [diff] [blame] | 782 | /* "Call Control" is the only cause code listed in 3GPP TS 48.008 3.2.1.21 CLEAR COMMAND |
| 783 | * that qualifies for a normal release situation. (OS#4664) */ |
| 784 | .gsm0808_cause = GSM0808_CAUSE_CALL_CONTROL, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 785 | .csfb_ind = (vsub && vsub->sgs_fsm->state == SGS_UE_ST_ASSOCIATED), |
| 786 | }, |
| 787 | }; |
| 788 | msc_a_get(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| 789 | msc_a_ran_down(msc_a, MSC_ROLE_I, &msg); |
Philipp Maier | 47cf84d | 2019-08-15 14:56:54 +0200 | [diff] [blame] | 790 | |
| 791 | /* The connection is cleared. The MS will now go back to 4G, |
| 792 | Switch the RAN type back to SGS. */ |
| 793 | if (vsub && vsub->sgs_fsm->state == SGS_UE_ST_ASSOCIATED) |
| 794 | vsub->cs.attached_via_ran = OSMO_RAT_EUTRAN_SGS; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 795 | } |
| 796 | |
| 797 | if (vsub) |
| 798 | vlr_subscr_put(vsub, __func__); |
| 799 | } |
| 800 | |
| 801 | static void msc_a_fsm_releasing(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 802 | { |
| 803 | struct msc_a *msc_a = fi->priv; |
| 804 | |
| 805 | msc_a_cleanup_rtp_streams(msc_a, event, data); |
| 806 | |
| 807 | switch (event) { |
| 808 | case MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST: |
| 809 | case MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST: |
| 810 | msc_a_ran_dec(msc_a, data, MSC_ROLE_I); |
| 811 | return; |
| 812 | |
| 813 | case MSC_A_EV_MO_CLOSE: |
| 814 | case MSC_A_EV_CN_CLOSE: |
| 815 | case MSC_A_EV_UNUSED: |
| 816 | /* Already releasing */ |
| 817 | return; |
| 818 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 819 | case MSC_EV_CALL_LEG_TERM: |
| 820 | case MSC_MNCC_EV_CALL_ENDED: |
| 821 | /* RTP streams cleaned up above */ |
| 822 | return; |
| 823 | |
Neels Hofmeyr | 0a437be | 2019-05-10 15:55:52 +0200 | [diff] [blame] | 824 | case MSC_A_EV_HANDOVER_END: |
| 825 | /* msc_ho_fsm does cleanup. */ |
| 826 | return; |
| 827 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 828 | default: |
| 829 | OSMO_ASSERT(false); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | |
| 834 | static void msc_a_fsm_released_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 835 | { |
| 836 | struct msc_a *msc_a = msc_a_fi_priv(fi); |
| 837 | char buf[128]; |
| 838 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Released: msc_a use is %s\n", |
| 839 | osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| 840 | if (osmo_use_count_total(&msc_a->use_count) == 0) |
| 841 | osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, fi); |
| 842 | } |
| 843 | |
| 844 | static void msc_a_fsm_released(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 845 | { |
| 846 | if (event == MSC_A_EV_UNUSED) |
| 847 | osmo_fsm_inst_term(fi, OSMO_FSM_TERM_REGULAR, fi); |
| 848 | } |
| 849 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 850 | void msc_a_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause) |
| 851 | { |
| 852 | struct msc_a *msc_a = msc_a_fi_priv(fi); |
| 853 | |
| 854 | trans_conn_closed(msc_a); |
| 855 | |
| 856 | if (msc_a_fsm_has_active_transactions(fi)) |
| 857 | LOG_MSC_A(msc_a, LOGL_ERROR, "Deallocating active transactions failed\n"); |
| 858 | |
| 859 | LOG_MSC_A_CAT(msc_a, DREF, LOGL_DEBUG, "max total use count was %d\n", msc_a->max_total_use_count); |
| 860 | } |
| 861 | |
| 862 | const struct value_string msc_a_fsm_event_names[] = { |
| 863 | OSMO_VALUE_STRING(MSC_REMOTE_EV_RX_GSUP), |
| 864 | OSMO_VALUE_STRING(MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE), |
| 865 | OSMO_VALUE_STRING(MSC_EV_CALL_LEG_RTP_COMPLETE), |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 866 | OSMO_VALUE_STRING(MSC_EV_CALL_LEG_TERM), |
| 867 | OSMO_VALUE_STRING(MSC_MNCC_EV_NEED_LOCAL_RTP), |
| 868 | OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_PROCEEDING), |
| 869 | OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_COMPLETE), |
| 870 | OSMO_VALUE_STRING(MSC_MNCC_EV_CALL_ENDED), |
| 871 | OSMO_VALUE_STRING(MSC_A_EV_FROM_I_COMPLETE_LAYER_3), |
| 872 | OSMO_VALUE_STRING(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST), |
| 873 | OSMO_VALUE_STRING(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST), |
| 874 | OSMO_VALUE_STRING(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST), |
| 875 | OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST), |
| 876 | OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE), |
| 877 | OSMO_VALUE_STRING(MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE), |
| 878 | OSMO_VALUE_STRING(MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST), |
| 879 | OSMO_VALUE_STRING(MSC_A_EV_COMPLETE_LAYER_3_OK), |
| 880 | OSMO_VALUE_STRING(MSC_A_EV_CLASSMARK_UPDATE), |
| 881 | OSMO_VALUE_STRING(MSC_A_EV_AUTHENTICATED), |
| 882 | OSMO_VALUE_STRING(MSC_A_EV_TRANSACTION_ACCEPTED), |
| 883 | OSMO_VALUE_STRING(MSC_A_EV_CN_CLOSE), |
| 884 | OSMO_VALUE_STRING(MSC_A_EV_MO_CLOSE), |
| 885 | OSMO_VALUE_STRING(MSC_A_EV_UNUSED), |
| 886 | OSMO_VALUE_STRING(MSC_A_EV_HANDOVER_REQUIRED), |
| 887 | OSMO_VALUE_STRING(MSC_A_EV_HANDOVER_END), |
| 888 | {} |
| 889 | }; |
| 890 | |
| 891 | #define S(x) (1 << (x)) |
| 892 | |
| 893 | static const struct osmo_fsm_state msc_a_fsm_states[] = { |
| 894 | [MSC_A_ST_VALIDATE_L3] = { |
| 895 | .name = OSMO_STRINGIFY(MSC_A_ST_VALIDATE_L3), |
| 896 | .in_event_mask = 0 |
| 897 | | S(MSC_A_EV_FROM_I_COMPLETE_LAYER_3) |
| 898 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 899 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 900 | | S(MSC_A_EV_COMPLETE_LAYER_3_OK) |
| 901 | | S(MSC_A_EV_MO_CLOSE) |
| 902 | | S(MSC_A_EV_CN_CLOSE) |
| 903 | | S(MSC_A_EV_UNUSED) |
| 904 | , |
| 905 | .out_state_mask = 0 |
| 906 | | S(MSC_A_ST_VALIDATE_L3) |
| 907 | | S(MSC_A_ST_AUTH_CIPH) |
| 908 | | S(MSC_A_ST_RELEASING) |
| 909 | , |
| 910 | .action = msc_a_fsm_validate_l3, |
| 911 | }, |
| 912 | [MSC_A_ST_AUTH_CIPH] = { |
| 913 | .name = OSMO_STRINGIFY(MSC_A_ST_AUTH_CIPH), |
| 914 | .in_event_mask = 0 |
| 915 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 916 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 917 | | S(MSC_A_EV_AUTHENTICATED) |
| 918 | | S(MSC_A_EV_MO_CLOSE) |
| 919 | | S(MSC_A_EV_CN_CLOSE) |
| 920 | | S(MSC_A_EV_UNUSED) |
| 921 | , |
| 922 | .out_state_mask = 0 |
| 923 | | S(MSC_A_ST_WAIT_CLASSMARK_UPDATE) |
| 924 | | S(MSC_A_ST_AUTHENTICATED) |
| 925 | | S(MSC_A_ST_RELEASING) |
| 926 | , |
| 927 | .action = msc_a_fsm_auth_ciph, |
| 928 | }, |
| 929 | [MSC_A_ST_WAIT_CLASSMARK_UPDATE] = { |
| 930 | .name = OSMO_STRINGIFY(MSC_A_ST_WAIT_CLASSMARK_UPDATE), |
| 931 | .in_event_mask = 0 |
| 932 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 933 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 934 | | S(MSC_A_EV_CLASSMARK_UPDATE) |
| 935 | | S(MSC_A_EV_MO_CLOSE) |
| 936 | | S(MSC_A_EV_CN_CLOSE) |
| 937 | , |
| 938 | .out_state_mask = 0 |
| 939 | | S(MSC_A_ST_AUTH_CIPH) |
| 940 | | S(MSC_A_ST_RELEASING) |
| 941 | , |
| 942 | .action = msc_a_fsm_wait_classmark_update, |
| 943 | }, |
| 944 | [MSC_A_ST_AUTHENTICATED] = { |
| 945 | .name = OSMO_STRINGIFY(MSC_A_ST_AUTHENTICATED), |
| 946 | /* allow everything to release for any odd behavior */ |
| 947 | .in_event_mask = 0 |
| 948 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 949 | | S(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST) |
| 950 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 951 | | S(MSC_A_EV_TRANSACTION_ACCEPTED) |
| 952 | | S(MSC_A_EV_MO_CLOSE) |
| 953 | | S(MSC_A_EV_CN_CLOSE) |
| 954 | | S(MSC_A_EV_UNUSED) |
| 955 | , |
| 956 | .out_state_mask = 0 |
| 957 | | S(MSC_A_ST_RELEASING) |
| 958 | | S(MSC_A_ST_COMMUNICATING) |
| 959 | , |
| 960 | .onenter = msc_a_fsm_authenticated_enter, |
| 961 | .action = msc_a_fsm_authenticated, |
| 962 | }, |
| 963 | [MSC_A_ST_COMMUNICATING] = { |
| 964 | .name = OSMO_STRINGIFY(MSC_A_ST_COMMUNICATING), |
| 965 | /* allow everything to release for any odd behavior */ |
| 966 | .in_event_mask = 0 |
| 967 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 968 | | S(MSC_A_EV_FROM_I_PREPARE_SUBSEQUENT_HANDOVER_REQUEST) |
| 969 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 970 | | S(MSC_A_EV_FROM_T_PREPARE_HANDOVER_RESPONSE) |
| 971 | | S(MSC_A_EV_FROM_T_PREPARE_HANDOVER_FAILURE) |
| 972 | | S(MSC_A_EV_FROM_T_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 973 | | S(MSC_A_EV_FROM_T_SEND_END_SIGNAL_REQUEST) |
| 974 | | S(MSC_A_EV_TRANSACTION_ACCEPTED) |
| 975 | | S(MSC_A_EV_MO_CLOSE) |
| 976 | | S(MSC_A_EV_CN_CLOSE) |
| 977 | | S(MSC_A_EV_UNUSED) |
| 978 | | S(MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE) |
| 979 | | S(MSC_EV_CALL_LEG_RTP_COMPLETE) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 980 | | S(MSC_EV_CALL_LEG_TERM) |
| 981 | | S(MSC_MNCC_EV_CALL_ENDED) |
| 982 | | S(MSC_A_EV_HANDOVER_REQUIRED) |
Neels Hofmeyr | 0a437be | 2019-05-10 15:55:52 +0200 | [diff] [blame] | 983 | | S(MSC_A_EV_HANDOVER_END) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 984 | , |
| 985 | .out_state_mask = 0 |
| 986 | | S(MSC_A_ST_RELEASING) |
| 987 | , |
| 988 | .action = msc_a_fsm_communicating, |
| 989 | }, |
| 990 | [MSC_A_ST_RELEASING] = { |
| 991 | .name = OSMO_STRINGIFY(MSC_A_ST_RELEASING), |
| 992 | .in_event_mask = 0 |
| 993 | | S(MSC_A_EV_FROM_I_PROCESS_ACCESS_SIGNALLING_REQUEST) |
| 994 | | S(MSC_A_EV_FROM_I_SEND_END_SIGNAL_REQUEST) |
| 995 | | S(MSC_A_EV_UNUSED) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 996 | | S(MSC_EV_CALL_LEG_TERM) |
| 997 | | S(MSC_MNCC_EV_CALL_ENDED) |
Neels Hofmeyr | 0a437be | 2019-05-10 15:55:52 +0200 | [diff] [blame] | 998 | | S(MSC_A_EV_HANDOVER_END) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 999 | , |
| 1000 | .out_state_mask = 0 |
| 1001 | | S(MSC_A_ST_RELEASED) |
| 1002 | , |
| 1003 | .onenter = msc_a_fsm_releasing_onenter, |
| 1004 | .action = msc_a_fsm_releasing, |
| 1005 | }, |
| 1006 | [MSC_A_ST_RELEASED] = { |
| 1007 | .name = OSMO_STRINGIFY(MSC_A_ST_RELEASED), |
| 1008 | .in_event_mask = 0 |
| 1009 | | S(MSC_A_EV_UNUSED) |
| 1010 | , |
| 1011 | .onenter = msc_a_fsm_released_onenter, |
| 1012 | .action = msc_a_fsm_released, |
| 1013 | }, |
| 1014 | }; |
| 1015 | |
| 1016 | static struct osmo_fsm msc_a_fsm = { |
| 1017 | .name = "msc_a", |
| 1018 | .states = msc_a_fsm_states, |
| 1019 | .num_states = ARRAY_SIZE(msc_a_fsm_states), |
| 1020 | .log_subsys = DMSC, |
| 1021 | .event_names = msc_a_fsm_event_names, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1022 | .timer_cb = msc_a_fsm_timer_cb, |
| 1023 | .cleanup = msc_a_fsm_cleanup, |
| 1024 | }; |
| 1025 | |
| 1026 | static __attribute__((constructor)) void msc_a_fsm_init() |
| 1027 | { |
| 1028 | OSMO_ASSERT(osmo_fsm_register(&msc_a_fsm) == 0); |
| 1029 | } |
| 1030 | |
| 1031 | static int msc_a_use_cb(struct osmo_use_count_entry *e, int32_t old_use_count, const char *file, int line) |
| 1032 | { |
| 1033 | struct msc_a *msc_a = e->use_count->talloc_object; |
| 1034 | char buf[128]; |
| 1035 | int32_t total; |
| 1036 | int level; |
| 1037 | |
| 1038 | if (!e->use) |
| 1039 | return -EINVAL; |
| 1040 | |
| 1041 | total = osmo_use_count_total(&msc_a->use_count); |
| 1042 | |
| 1043 | if (total == 0 |
| 1044 | || (total == 1 && old_use_count == 0 && e->count == 1)) |
| 1045 | level = LOGL_INFO; |
| 1046 | else |
| 1047 | level = LOGL_DEBUG; |
| 1048 | |
| 1049 | LOG_MSC_A_CAT_SRC(msc_a, DREF, level, file, line, "%s %s: now used by %s\n", |
| 1050 | (e->count - old_use_count) > 0? "+" : "-", e->use, |
| 1051 | osmo_use_count_name_buf(buf, sizeof(buf), &msc_a->use_count)); |
| 1052 | |
| 1053 | if (e->count < 0) |
| 1054 | return -ERANGE; |
| 1055 | |
| 1056 | msc_a->max_total_use_count = OSMO_MAX(msc_a->max_total_use_count, total); |
| 1057 | |
| 1058 | if (total == 0) |
| 1059 | osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_UNUSED, NULL); |
| 1060 | return 0; |
| 1061 | } |
| 1062 | |
| 1063 | struct msc_a *msc_a_alloc(struct msub *msub, struct ran_infra *ran) |
| 1064 | { |
| 1065 | struct msc_a *msc_a = msub_role_alloc(msub, MSC_ROLE_A, &msc_a_fsm, struct msc_a, ran); |
| 1066 | msc_a->use_count = (struct osmo_use_count){ |
| 1067 | .talloc_object = msc_a, |
| 1068 | .use_cb = msc_a_use_cb, |
| 1069 | }; |
| 1070 | osmo_use_count_make_static_entries(&msc_a->use_count, msc_a->use_count_buf, ARRAY_SIZE(msc_a->use_count_buf)); |
| 1071 | /* Start timeout for first state */ |
Neels Hofmeyr | 0165325 | 2019-09-03 02:06:22 +0200 | [diff] [blame] | 1072 | msc_a_state_chg_always(msc_a, MSC_A_ST_VALIDATE_L3); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1073 | return msc_a; |
| 1074 | } |
| 1075 | |
| 1076 | bool msc_a_is_establishing_auth_ciph(const struct msc_a *msc_a) |
| 1077 | { |
| 1078 | if (!msc_a || !msc_a->c.fi) |
| 1079 | return false; |
| 1080 | return msc_a->c.fi->state == MSC_A_ST_AUTH_CIPH; |
| 1081 | } |
| 1082 | |
| 1083 | const struct value_string complete_layer3_type_names[] = { |
| 1084 | { COMPLETE_LAYER3_NONE, "NONE" }, |
| 1085 | { COMPLETE_LAYER3_LU, "LU" }, |
| 1086 | { COMPLETE_LAYER3_CM_SERVICE_REQ, "CM_SERVICE_REQ" }, |
| 1087 | { COMPLETE_LAYER3_PAGING_RESP, "PAGING_RESP" }, |
| 1088 | { 0, NULL } |
| 1089 | }; |
| 1090 | |
| 1091 | #define _msc_a_update_id(MSC_A, FMT, ARGS ...) \ |
| 1092 | do { \ |
| 1093 | if (osmo_fsm_inst_update_id_f(msc_a->c.fi, FMT ":%s:%s", \ |
| 1094 | ## ARGS, \ |
| 1095 | msub_ran_conn_name(msc_a->c.msub), \ |
| 1096 | complete_layer3_type_name(msc_a->complete_layer3_type)) \ |
| 1097 | == 0) { \ |
| 1098 | struct vlr_subscr *_vsub = msc_a_vsub(MSC_A); \ |
| 1099 | if (_vsub) { \ |
| 1100 | if (_vsub->lu_fsm) \ |
| 1101 | osmo_fsm_inst_update_id(_vsub->lu_fsm, (MSC_A)->c.fi->id); \ |
| 1102 | if (_vsub->auth_fsm) \ |
| 1103 | osmo_fsm_inst_update_id(_vsub->auth_fsm, (MSC_A)->c.fi->id); \ |
| 1104 | if (_vsub->proc_arq_fsm) \ |
| 1105 | osmo_fsm_inst_update_id(_vsub->proc_arq_fsm, (MSC_A)->c.fi->id); \ |
| 1106 | } \ |
| 1107 | LOG_MSC_A(MSC_A, LOGL_DEBUG, "Updated ID\n"); \ |
| 1108 | } \ |
| 1109 | /* otherwise osmo_fsm_inst_update_id_f() will log an error. */ \ |
| 1110 | } while (0) |
| 1111 | |
| 1112 | |
| 1113 | /* Compose an ID almost like gsm48_mi_to_string(), but print the MI type along, and print a TMSI as hex. */ |
Neels Hofmeyr | 46d526a | 2020-05-29 03:27:50 +0200 | [diff] [blame] | 1114 | void msc_a_update_id_from_mi(struct msc_a *msc_a, const struct osmo_mobile_identity *mi) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1115 | { |
Neels Hofmeyr | 46d526a | 2020-05-29 03:27:50 +0200 | [diff] [blame] | 1116 | _msc_a_update_id(msc_a, "%s", osmo_mobile_identity_to_str_c(OTC_SELECT, mi)); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1117 | } |
| 1118 | |
| 1119 | /* Update msc_a->fi id string from current msc_a->vsub and msc_a->complete_layer3_type. */ |
| 1120 | void msc_a_update_id(struct msc_a *msc_a) |
| 1121 | { |
| 1122 | _msc_a_update_id(msc_a, "%s", vlr_subscr_name(msc_a_vsub(msc_a))); |
| 1123 | } |
| 1124 | |
| 1125 | /* Iterate all msc_a instances that are relevant for this subscriber, and update FSM ID strings for all of the FSM |
| 1126 | * instances. */ |
| 1127 | void msc_a_update_id_for_vsub(struct vlr_subscr *for_vsub) |
| 1128 | { |
| 1129 | struct msub *msub; |
| 1130 | llist_for_each_entry(msub, &msub_list, entry) { |
| 1131 | struct vlr_subscr *vsub = msub_vsub(msub); |
| 1132 | if (vsub != for_vsub) |
| 1133 | continue; |
| 1134 | msc_a_update_id(msub_msc_a(msub)); |
| 1135 | } |
| 1136 | } |
| 1137 | |
| 1138 | static bool msg_is_initially_permitted(const struct gsm48_hdr *hdr) |
| 1139 | { |
| 1140 | uint8_t pdisc = gsm48_hdr_pdisc(hdr); |
| 1141 | uint8_t msg_type = gsm48_hdr_msg_type(hdr); |
| 1142 | |
| 1143 | switch (pdisc) { |
| 1144 | case GSM48_PDISC_MM: |
| 1145 | switch (msg_type) { |
| 1146 | case GSM48_MT_MM_LOC_UPD_REQUEST: |
| 1147 | case GSM48_MT_MM_CM_SERV_REQ: |
| 1148 | case GSM48_MT_MM_CM_REEST_REQ: |
| 1149 | case GSM48_MT_MM_AUTH_RESP: |
| 1150 | case GSM48_MT_MM_AUTH_FAIL: |
| 1151 | case GSM48_MT_MM_ID_RESP: |
| 1152 | case GSM48_MT_MM_TMSI_REALL_COMPL: |
| 1153 | case GSM48_MT_MM_IMSI_DETACH_IND: |
| 1154 | return true; |
| 1155 | default: |
| 1156 | break; |
| 1157 | } |
| 1158 | break; |
| 1159 | case GSM48_PDISC_RR: |
| 1160 | switch (msg_type) { |
| 1161 | /* GSM48_MT_RR_CIPH_M_COMPL is actually handled in bssmap_rx_ciph_compl() and gets redirected in the |
| 1162 | * BSSAP layer to ran_conn_cipher_mode_compl() (before this here is reached) */ |
| 1163 | case GSM48_MT_RR_PAG_RESP: |
| 1164 | case GSM48_MT_RR_CIPH_M_COMPL: |
| 1165 | return true; |
| 1166 | default: |
| 1167 | break; |
| 1168 | } |
| 1169 | break; |
| 1170 | default: |
| 1171 | break; |
| 1172 | } |
| 1173 | |
| 1174 | return false; |
| 1175 | } |
| 1176 | |
| 1177 | /* Main entry point for GSM 04.08/44.008 Layer 3 data (e.g. from the BSC). */ |
| 1178 | int msc_a_up_l3(struct msc_a *msc_a, struct msgb *msg) |
| 1179 | { |
| 1180 | struct gsm48_hdr *gh; |
| 1181 | uint8_t pdisc; |
| 1182 | int rc; |
| 1183 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 1184 | int is_r99; |
| 1185 | |
| 1186 | OSMO_ASSERT(msg->l3h); |
| 1187 | OSMO_ASSERT(msg); |
| 1188 | |
| 1189 | gh = msgb_l3(msg); |
| 1190 | pdisc = gsm48_hdr_pdisc(gh); |
| 1191 | |
| 1192 | LOG_MSC_A_CAT(msc_a, DRLL, LOGL_DEBUG, "Dispatching 04.08 message: %s %s\n", |
| 1193 | gsm48_pdisc_name(pdisc), gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| 1194 | |
| 1195 | /* To evaluate the 3GPP TS 24.007 Duplicate Detection, we need Classmark information on whether the MS is R99 |
| 1196 | * capable. If the subscriber is already actively connected, the Classmark information is stored with the |
| 1197 | * vlr_subscr. Otherwise, this *must* be a Complete Layer 3 with Classmark info. */ |
| 1198 | if (vsub) |
| 1199 | is_r99 = osmo_gsm48_classmark_is_r99(&vsub->classmark) ? 1 : 0; |
| 1200 | else |
| 1201 | is_r99 = compl_l3_msg_is_r99(msg); |
| 1202 | |
| 1203 | if (is_r99 < 0) { |
| 1204 | LOG_MSC_A(msc_a, LOGL_ERROR, |
| 1205 | "No Classmark Information, dropping non-Complete-Layer3 message: %s\n", |
| 1206 | gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| 1207 | return -EACCES; |
| 1208 | } |
| 1209 | |
| 1210 | if (is_r99 >= 0 |
| 1211 | && ran_dec_dtap_undup_is_duplicate(msc_a->c.fi, msc_a->n_sd_next, is_r99 ? true : false, msg)) { |
| 1212 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Dropping duplicate message" |
| 1213 | " (3GPP TS 24.007 11.2.3.2 Message Type Octet / Duplicate Detection)\n"); |
| 1214 | return 0; |
| 1215 | } |
| 1216 | |
| 1217 | if (!msc_a_is_accepted(msc_a) |
| 1218 | && !msg_is_initially_permitted(gh)) { |
| 1219 | LOG_MSC_A(msc_a, LOGL_ERROR, |
| 1220 | "Message not permitted for initial conn: %s\n", |
| 1221 | gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| 1222 | return -EACCES; |
| 1223 | } |
| 1224 | |
| 1225 | if (vsub && vsub->cs.attached_via_ran != msc_a->c.ran->type) { |
| 1226 | LOG_MSC_A(msc_a, LOGL_ERROR, |
| 1227 | "Illegal situation: RAN type mismatch:" |
| 1228 | " attached via %s, received message via %s\n", |
| 1229 | osmo_rat_type_name(vsub->cs.attached_via_ran), |
| 1230 | osmo_rat_type_name(msc_a->c.ran->type)); |
| 1231 | return -EACCES; |
| 1232 | } |
| 1233 | |
| 1234 | #if 0 |
| 1235 | if (silent_call_reroute(conn, msg)) |
| 1236 | return silent_call_rx(conn, msg); |
| 1237 | #endif |
| 1238 | |
| 1239 | switch (pdisc) { |
| 1240 | case GSM48_PDISC_CC: |
| 1241 | rc = gsm0408_rcv_cc(msc_a, msg); |
| 1242 | break; |
| 1243 | case GSM48_PDISC_MM: |
| 1244 | rc = gsm0408_rcv_mm(msc_a, msg); |
| 1245 | break; |
| 1246 | case GSM48_PDISC_RR: |
| 1247 | rc = gsm0408_rcv_rr(msc_a, msg); |
| 1248 | break; |
| 1249 | case GSM48_PDISC_SMS: |
| 1250 | rc = gsm0411_rcv_sms(msc_a, msg); |
| 1251 | break; |
| 1252 | case GSM48_PDISC_MM_GPRS: |
| 1253 | case GSM48_PDISC_SM_GPRS: |
| 1254 | LOG_MSC_A_CAT(msc_a, DRLL, LOGL_NOTICE, "Unimplemented " |
| 1255 | "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| 1256 | rc = -ENOTSUP; |
| 1257 | break; |
| 1258 | case GSM48_PDISC_NC_SS: |
| 1259 | rc = gsm0911_rcv_nc_ss(msc_a, msg); |
| 1260 | break; |
| 1261 | case GSM48_PDISC_TEST: |
| 1262 | rc = gsm0414_rcv_test(msc_a, msg); |
| 1263 | break; |
| 1264 | default: |
| 1265 | LOG_MSC_A_CAT(msc_a, DRLL, LOGL_NOTICE, "Unknown " |
| 1266 | "GSM 04.08 discriminator 0x%02x\n", pdisc); |
| 1267 | rc = -EINVAL; |
| 1268 | break; |
| 1269 | } |
| 1270 | |
| 1271 | return rc; |
| 1272 | } |
| 1273 | |
| 1274 | static void msc_a_up_call_assignment_complete(struct msc_a *msc_a, const struct ran_msg *ac) |
| 1275 | { |
| 1276 | struct gsm_trans *cc_trans = msc_a->cc.active_trans; |
| 1277 | struct rtp_stream *rtps_to_ran = msc_a->cc.call_leg ? msc_a->cc.call_leg->rtp[RTP_TO_RAN] : NULL; |
| 1278 | |
| 1279 | if (!rtps_to_ran) { |
| 1280 | LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but no RTP stream is set up\n"); |
| 1281 | return; |
| 1282 | } |
| 1283 | if (!cc_trans) { |
| 1284 | LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Assignment Complete, but CC transaction is active\n"); |
| 1285 | return; |
| 1286 | } |
| 1287 | |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1288 | if (rtps_to_ran->use_osmux != ac->assignment_complete.osmux_present) { |
| 1289 | LOG_MSC_A_CAT(msc_a, DCC, LOGL_ERROR, "Osmux usage ass request and complete don't match: %d vs %d\n", |
| 1290 | rtps_to_ran->use_osmux, ac->assignment_complete.osmux_present); |
| 1291 | call_leg_release(msc_a->cc.call_leg); |
| 1292 | return; |
| 1293 | } |
| 1294 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1295 | /* Update RAN-side endpoint CI: */ |
| 1296 | rtp_stream_set_codec(rtps_to_ran, ac->assignment_complete.codec); |
| 1297 | rtp_stream_set_remote_addr(rtps_to_ran, &ac->assignment_complete.remote_rtp); |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1298 | if (rtps_to_ran->use_osmux) |
| 1299 | rtp_stream_set_remote_osmux_cid(rtps_to_ran, |
| 1300 | ac->assignment_complete.osmux_cid); |
| 1301 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1302 | rtp_stream_commit(rtps_to_ran); |
| 1303 | |
| 1304 | /* Setup CN side endpoint CI: |
| 1305 | * Now that |
| 1306 | * - the first CI has been created and a definitive endpoint name is assigned to the call_leg's MGW |
| 1307 | * endpoint, |
| 1308 | * - the Assignment has chosen a speech codec |
| 1309 | * go on to create the CN side RTP stream's CI. */ |
| 1310 | if (call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_CN, cc_trans->callref, cc_trans, |
| 1311 | &ac->assignment_complete.codec, NULL)) { |
| 1312 | LOG_MSC_A_CAT(msc_a, DCC, LOGL_ERROR, "Error creating MGW CI towards CN\n"); |
| 1313 | call_leg_release(msc_a->cc.call_leg); |
| 1314 | return; |
| 1315 | } |
| 1316 | } |
| 1317 | |
| 1318 | static void msc_a_up_call_assignment_failure(struct msc_a *msc_a, const struct ran_msg *af) |
| 1319 | { |
| 1320 | struct gsm_trans *trans; |
| 1321 | |
| 1322 | /* For a normal voice call, there will be an rtp_stream FSM. */ |
| 1323 | if (msc_a->cc.call_leg && msc_a->cc.call_leg->rtp[RTP_TO_RAN]) { |
| 1324 | LOG_MSC_A(msc_a, LOGL_ERROR, "Assignment Failure, releasing call\n"); |
| 1325 | rtp_stream_release(msc_a->cc.call_leg->rtp[RTP_TO_RAN]); |
| 1326 | return; |
| 1327 | } |
| 1328 | |
| 1329 | /* Otherwise, a silent call might be active */ |
| 1330 | trans = trans_find_by_type(msc_a, TRANS_SILENT_CALL); |
| 1331 | if (trans) { |
| 1332 | LOG_MSC_A(msc_a, LOGL_ERROR, "Assignment Failure, releasing silent call\n"); |
| 1333 | trans_free(trans); |
| 1334 | return; |
| 1335 | } |
| 1336 | |
| 1337 | /* Neither a voice call nor silent call assignment. Assume the worst and detach. */ |
| 1338 | msc_a_release_cn(msc_a); |
| 1339 | } |
| 1340 | |
| 1341 | static void msc_a_up_classmark_update(struct msc_a *msc_a, const struct osmo_gsm48_classmark *classmark, |
| 1342 | struct osmo_gsm48_classmark *dst) |
| 1343 | { |
| 1344 | if (!dst) { |
| 1345 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 1346 | |
| 1347 | if (!vsub) |
| 1348 | dst = &msc_a->temporary_classmark; |
| 1349 | else |
| 1350 | dst = &vsub->classmark; |
| 1351 | } |
| 1352 | |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 1353 | LOG_MSC_A(msc_a, LOGL_DEBUG, "A5 capabilities received from Classmark Update: %s\n", |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1354 | osmo_gsm48_classmark_a5_name(classmark)); |
| 1355 | osmo_gsm48_classmark_update(dst, classmark); |
| 1356 | |
| 1357 | /* bump subscr conn FSM in case it is waiting for a Classmark Update */ |
| 1358 | if (msc_a->c.fi->state == MSC_A_ST_WAIT_CLASSMARK_UPDATE) |
| 1359 | osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_CLASSMARK_UPDATE, NULL); |
| 1360 | } |
| 1361 | |
| 1362 | static void msc_a_up_sapi_n_reject(struct msc_a *msc_a, const struct ran_msg *msg) |
| 1363 | { |
| 1364 | int sapi = msg->sapi_n_reject.dlci & 0x7; |
| 1365 | if (sapi == UM_SAPI_SMS) |
| 1366 | gsm411_sapi_n_reject(msc_a); |
| 1367 | } |
| 1368 | |
| 1369 | static int msc_a_up_ho(struct msc_a *msc_a, const struct msc_a_ran_dec_data *d, uint32_t ho_fi_event) |
| 1370 | { |
| 1371 | if (!msc_a->ho.fi) { |
| 1372 | LOG_MSC_A(msc_a, LOGL_ERROR, "Rx Handover message, but no Handover ongoing: %s\n", d->ran_dec->msg_name); |
| 1373 | return -EINVAL; |
| 1374 | } |
| 1375 | return osmo_fsm_inst_dispatch(msc_a->ho.fi, ho_fi_event, (void*)d); |
| 1376 | } |
| 1377 | |
| 1378 | int msc_a_ran_dec_from_msc_i(struct msc_a *msc_a, struct msc_a_ran_dec_data *d) |
| 1379 | { |
| 1380 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 1381 | const struct ran_msg *msg = d->ran_dec; |
| 1382 | int rc = -99; |
| 1383 | |
| 1384 | switch (msg->msg_type) { |
| 1385 | |
| 1386 | case RAN_MSG_COMPL_L3: |
Neels Hofmeyr | 68f50da | 2020-06-24 14:22:52 +0200 | [diff] [blame] | 1387 | /* In case the cell_id from Complete Layer 3 Information lacks a PLMN, write the configured PLMN code |
| 1388 | * into msc_a->via_cell. Then overwrite with those bits obtained from Complete Layer 3 Information. */ |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1389 | msc_a->via_cell = (struct osmo_cell_global_id){ |
| 1390 | .lai.plmn = msc_a_net(msc_a)->plmn, |
| 1391 | }; |
| 1392 | gsm0808_cell_id_to_cgi(&msc_a->via_cell, msg->compl_l3.cell_id); |
| 1393 | rc = msc_a_up_l3(msc_a, msg->compl_l3.msg); |
| 1394 | if (!rc) { |
| 1395 | struct ran_conn *conn = msub_ran_conn(msc_a->c.msub); |
| 1396 | if (conn) |
| 1397 | ran_peer_cells_seen_add(conn->ran_peer, msg->compl_l3.cell_id); |
| 1398 | } |
| 1399 | break; |
| 1400 | |
| 1401 | case RAN_MSG_DTAP: |
| 1402 | rc = msc_a_up_l3(msc_a, msg->dtap); |
| 1403 | break; |
| 1404 | |
| 1405 | case RAN_MSG_CLEAR_REQUEST: |
| 1406 | rc = osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_MO_CLOSE, NULL); |
| 1407 | break; |
| 1408 | |
| 1409 | case RAN_MSG_CLEAR_COMPLETE: |
| 1410 | switch (msc_a->c.fi->state) { |
| 1411 | case MSC_A_ST_RELEASING: |
| 1412 | msc_a_put_all(msc_a, MSC_A_USE_WAIT_CLEAR_COMPLETE); |
| 1413 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASED); |
| 1414 | break; |
| 1415 | case MSC_A_ST_RELEASED: |
| 1416 | break; |
| 1417 | default: |
| 1418 | LOG_MSC_A(msc_a, LOGL_ERROR, "Received Clear Complete event, but did not send Clear Command\n"); |
| 1419 | msc_a_state_chg(msc_a, MSC_A_ST_RELEASING); |
| 1420 | break; |
| 1421 | } |
| 1422 | rc = 0; |
| 1423 | break; |
| 1424 | |
| 1425 | case RAN_MSG_CLASSMARK_UPDATE: |
| 1426 | msc_a_up_classmark_update(msc_a, msg->classmark_update.classmark, NULL); |
| 1427 | rc = 0; |
| 1428 | break; |
| 1429 | |
| 1430 | case RAN_MSG_CIPHER_MODE_COMPLETE: |
| 1431 | /* Remember what Ciphering was negotiated (e.g. for Handover) */ |
| 1432 | if (msg->cipher_mode_complete.alg_id) { |
| 1433 | msc_a->geran_encr.alg_id = msg->cipher_mode_complete.alg_id; |
| 1434 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Cipher Mode Complete: chosen encryption algorithm: A5/%u\n", |
| 1435 | msc_a->geran_encr.alg_id - 1); |
| 1436 | }; |
| 1437 | vlr_subscr_rx_ciph_res(vsub, VLR_CIPH_COMPL); |
| 1438 | rc = 0; |
Neels Hofmeyr | e9a3911 | 2019-08-29 00:10:49 +0200 | [diff] [blame] | 1439 | |
| 1440 | /* Evaluate enclosed L3 message, typically Identity Response (IMEISV) */ |
| 1441 | if (msg->cipher_mode_complete.l3_msg) { |
| 1442 | unsigned char *data = (unsigned char*)(msg->cipher_mode_complete.l3_msg->val); |
| 1443 | uint16_t len = msg->cipher_mode_complete.l3_msg->len; |
| 1444 | struct msgb *dtap = msgb_alloc(len, "DTAP from Cipher Mode Complete"); |
| 1445 | unsigned char *pos = msgb_put(dtap, len); |
| 1446 | memcpy(pos, data, len); |
| 1447 | dtap->l3h = pos; |
| 1448 | rc = msc_a_up_l3(msc_a, dtap); |
| 1449 | msgb_free(dtap); |
| 1450 | } |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1451 | break; |
| 1452 | |
| 1453 | case RAN_MSG_CIPHER_MODE_REJECT: |
| 1454 | vlr_subscr_rx_ciph_res(vsub, VLR_CIPH_REJECT); |
| 1455 | rc = 0; |
| 1456 | break; |
| 1457 | |
| 1458 | case RAN_MSG_ASSIGNMENT_COMPLETE: |
| 1459 | msc_a_up_call_assignment_complete(msc_a, msg); |
| 1460 | rc = 0; |
| 1461 | break; |
| 1462 | |
| 1463 | case RAN_MSG_ASSIGNMENT_FAILURE: |
| 1464 | msc_a_up_call_assignment_failure(msc_a, msg); |
| 1465 | rc = 0; |
| 1466 | break; |
| 1467 | |
| 1468 | case RAN_MSG_SAPI_N_REJECT: |
| 1469 | msc_a_up_sapi_n_reject(msc_a, msg); |
| 1470 | rc = 0; |
| 1471 | break; |
| 1472 | |
| 1473 | case RAN_MSG_HANDOVER_PERFORMED: |
| 1474 | /* The BSS lets us know that a handover happened within the BSS, which doesn't concern us. */ |
| 1475 | LOG_MSC_A(msc_a, LOGL_ERROR, "'Handover Performed' handling not implemented\n"); |
| 1476 | break; |
| 1477 | |
| 1478 | case RAN_MSG_HANDOVER_REQUIRED: |
| 1479 | /* The BSS lets us know that it wants to handover to a different cell */ |
| 1480 | rc = osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_HANDOVER_REQUIRED, (void*)&msg->handover_required); |
| 1481 | break; |
| 1482 | |
| 1483 | case RAN_MSG_HANDOVER_FAILURE: |
| 1484 | rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_FAILURE); |
| 1485 | break; |
| 1486 | |
| 1487 | default: |
| 1488 | LOG_MSC_A(msc_a, LOGL_ERROR, "Message from MSC-I not implemented: %s\n", ran_msg_type_name(msg->msg_type)); |
| 1489 | rc = -ENOTSUP; |
| 1490 | break; |
| 1491 | } |
| 1492 | return rc; |
| 1493 | } |
| 1494 | |
| 1495 | static int msc_a_ran_dec_from_msc_t(struct msc_a *msc_a, struct msc_a_ran_dec_data *d) |
| 1496 | { |
| 1497 | struct msc_t *msc_t = msc_a_msc_t(msc_a); |
| 1498 | int rc = -99; |
| 1499 | |
| 1500 | if (!msc_t) { |
| 1501 | LOG_MSC_A(msc_a, LOGL_ERROR, "Rx message from MSC-T role, but I have no active MSC-T role.\n"); |
| 1502 | return -EINVAL; |
| 1503 | } |
| 1504 | |
| 1505 | OSMO_ASSERT(d->ran_dec); |
| 1506 | |
| 1507 | switch (d->ran_dec->msg_type) { |
| 1508 | |
| 1509 | case RAN_MSG_CLEAR_REQUEST: |
| 1510 | rc = osmo_fsm_inst_dispatch(msc_t->c.fi, MSC_T_EV_MO_CLOSE, NULL); |
| 1511 | break; |
| 1512 | |
| 1513 | case RAN_MSG_CLEAR_COMPLETE: |
| 1514 | rc = osmo_fsm_inst_dispatch(msc_t->c.fi, MSC_T_EV_CLEAR_COMPLETE, NULL); |
| 1515 | break; |
| 1516 | |
| 1517 | case RAN_MSG_CLASSMARK_UPDATE: |
| 1518 | msc_a_up_classmark_update(msc_a, d->ran_dec->classmark_update.classmark, &msc_t->classmark); |
| 1519 | rc = 0; |
| 1520 | break; |
| 1521 | |
| 1522 | case RAN_MSG_HANDOVER_REQUEST_ACK: |
| 1523 | /* new BSS accepts Handover */ |
| 1524 | rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_REQUEST_ACK); |
| 1525 | break; |
| 1526 | |
| 1527 | case RAN_MSG_HANDOVER_DETECT: |
| 1528 | /* new BSS signals the MS is DETECTed on the new lchan */ |
| 1529 | rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_DETECT); |
| 1530 | break; |
| 1531 | |
| 1532 | case RAN_MSG_HANDOVER_COMPLETE: |
| 1533 | /* new BSS signals the MS has fully moved to the new lchan */ |
| 1534 | rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_COMPLETE); |
| 1535 | break; |
| 1536 | |
| 1537 | case RAN_MSG_HANDOVER_FAILURE: |
| 1538 | rc = msc_a_up_ho(msc_a, d, MSC_HO_EV_RX_FAILURE); |
| 1539 | break; |
| 1540 | |
| 1541 | default: |
| 1542 | LOG_MSC_A(msc_a, LOGL_ERROR, "Message from MSC-T not implemented: %s\n", |
| 1543 | ran_msg_type_name(d->ran_dec->msg_type)); |
| 1544 | rc = -ENOTSUP; |
| 1545 | break; |
| 1546 | } |
| 1547 | return rc; |
| 1548 | } |
| 1549 | |
| 1550 | int msc_a_ran_decode_cb(struct osmo_fsm_inst *msc_a_fi, void *data, const struct ran_msg *msg) |
| 1551 | { |
| 1552 | struct msc_a *msc_a = msc_a_fi_priv(msc_a_fi); |
| 1553 | struct msc_a_ran_dec_data *d = data; |
| 1554 | int rc = -99; |
| 1555 | |
| 1556 | d->ran_dec = msg; |
| 1557 | |
| 1558 | switch (d->from_role) { |
| 1559 | case MSC_ROLE_I: |
| 1560 | LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN decode: %s\n", msg->msg_name ? : ran_msg_type_name(msg->msg_type)); |
| 1561 | rc = msc_a_ran_dec_from_msc_i(msc_a, d); |
| 1562 | break; |
| 1563 | |
| 1564 | case MSC_ROLE_T: |
| 1565 | LOG_MSC_A(msc_a, LOGL_DEBUG, "RAN decode from MSC-T: %s\n", |
| 1566 | msg->msg_name ? : ran_msg_type_name(msg->msg_type)); |
| 1567 | rc = msc_a_ran_dec_from_msc_t(msc_a, d); |
| 1568 | break; |
| 1569 | |
| 1570 | default: |
| 1571 | LOG_MSC_A(msc_a, LOGL_ERROR, "Message from invalid role %s: %s\n", msc_role_name(d->from_role), |
| 1572 | ran_msg_type_name(msg->msg_type)); |
| 1573 | return -ENOTSUP; |
| 1574 | } |
| 1575 | |
| 1576 | if (rc) |
| 1577 | LOG_MSC_A(msc_a, LOGL_ERROR, "RAN decode error (rc=%d) for %s from %s\n", rc, ran_msg_type_name(msg->msg_type), |
| 1578 | msc_role_name(d->from_role)); |
| 1579 | return rc; |
| 1580 | } |
| 1581 | |
| 1582 | /* Your typical DTAP via FORWARD_ACCESS_SIGNALLING_REQUEST */ |
| 1583 | int _msc_a_ran_down(struct msc_a *msc_a, enum msc_role to_role, const struct ran_msg *ran_msg, |
| 1584 | const char *file, int line) |
| 1585 | { |
| 1586 | return _msc_a_msg_down(msc_a, to_role, msub_role_to_role_event(msc_a->c.msub, MSC_ROLE_A, to_role), |
| 1587 | ran_msg, file, line); |
| 1588 | } |
| 1589 | |
| 1590 | /* To transmit more complex events than just FORWARD_ACCESS_SIGNALLING_REQUEST, e.g. an |
| 1591 | * MSC_T_EV_FROM_A_PREPARE_HANDOVER_REQUEST */ |
| 1592 | int _msc_a_msg_down(struct msc_a *msc_a, enum msc_role to_role, uint32_t to_role_event, |
| 1593 | const struct ran_msg *ran_msg, |
| 1594 | const char *file, int line) |
| 1595 | { |
| 1596 | struct an_apdu an_apdu = { |
| 1597 | .an_proto = msc_a->c.ran->an_proto, |
| 1598 | .msg = msc_role_ran_encode(msc_a->c.fi, ran_msg), |
| 1599 | }; |
| 1600 | int rc; |
| 1601 | if (!an_apdu.msg) |
| 1602 | return -EIO; |
| 1603 | rc = _msub_role_dispatch(msc_a->c.msub, to_role, to_role_event, &an_apdu, file, line); |
| 1604 | msgb_free(an_apdu.msg); |
| 1605 | return rc; |
| 1606 | } |
| 1607 | |
| 1608 | int msc_a_tx_dtap_to_i(struct msc_a *msc_a, struct msgb *dtap) |
| 1609 | { |
| 1610 | struct ran_msg ran_msg; |
Neels Hofmeyr | c192c0b | 2019-10-07 21:41:18 +0200 | [diff] [blame] | 1611 | struct gsm48_hdr *gh = msgb_l3(dtap) ? : dtap->data; |
| 1612 | uint8_t pdisc = gsm48_hdr_pdisc(gh); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1613 | |
Neels Hofmeyr | 2e8f881 | 2019-08-21 16:56:41 +0200 | [diff] [blame] | 1614 | if (!msc_a) { |
Neels Hofmeyr | 2e8f881 | 2019-08-21 16:56:41 +0200 | [diff] [blame] | 1615 | LOGP(DMSC, LOGL_ERROR, "Attempt to send DTAP to NULL MSC-A, dropping message: %s %s\n", |
| 1616 | gsm48_pdisc_name(pdisc), gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| 1617 | msgb_free(dtap); |
| 1618 | return -EIO; |
| 1619 | } |
| 1620 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1621 | if (msc_a->c.ran->type == OSMO_RAT_EUTRAN_SGS) { |
| 1622 | /* The SGs connection to the MME always is at the MSC-A. */ |
| 1623 | return sgs_iface_tx_dtap_ud(msc_a, dtap); |
| 1624 | } |
| 1625 | |
Neels Hofmeyr | c192c0b | 2019-10-07 21:41:18 +0200 | [diff] [blame] | 1626 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Sending DTAP: %s %s\n", |
| 1627 | gsm48_pdisc_name(pdisc), gsm48_pdisc_msgtype_name(pdisc, gsm48_hdr_msg_type(gh))); |
| 1628 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1629 | ran_msg = (struct ran_msg){ |
| 1630 | .msg_type = RAN_MSG_DTAP, |
| 1631 | .dtap = dtap, |
| 1632 | }; |
| 1633 | return msc_a_ran_down(msc_a, MSC_ROLE_I, &ran_msg); |
| 1634 | } |
| 1635 | |
| 1636 | struct msc_a *msc_a_for_vsub(const struct vlr_subscr *vsub, bool valid_conn_only) |
| 1637 | { |
| 1638 | struct msc_a *msc_a = msub_msc_a(msub_for_vsub(vsub)); |
| 1639 | if (valid_conn_only && !msc_a_is_accepted(msc_a)) |
| 1640 | return NULL; |
| 1641 | return msc_a; |
| 1642 | } |
| 1643 | |
| 1644 | int msc_tx_common_id(struct msc_a *msc_a, enum msc_role to_role) |
| 1645 | { |
| 1646 | struct vlr_subscr *vsub = msc_a_vsub(msc_a); |
| 1647 | struct ran_msg msg = { |
| 1648 | .msg_type = RAN_MSG_COMMON_ID, |
| 1649 | .common_id = { |
| 1650 | .imsi = vsub->imsi, |
| 1651 | }, |
| 1652 | }; |
| 1653 | |
| 1654 | return msc_a_ran_down(msc_a, to_role, &msg); |
| 1655 | } |
| 1656 | |
| 1657 | static int msc_a_start_assignment(struct msc_a *msc_a, struct gsm_trans *cc_trans) |
| 1658 | { |
| 1659 | struct call_leg *cl = msc_a->cc.call_leg; |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1660 | struct msc_i *msc_i = msc_a_msc_i(msc_a); |
| 1661 | struct gsm_network *net = msc_a_net(msc_a); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1662 | |
| 1663 | OSMO_ASSERT(!msc_a->cc.active_trans); |
| 1664 | msc_a->cc.active_trans = cc_trans; |
| 1665 | |
| 1666 | OSMO_ASSERT(cc_trans && cc_trans->type == TRANS_CC); |
| 1667 | |
| 1668 | if (!cl) { |
| 1669 | cl = msc_a->cc.call_leg = call_leg_alloc(msc_a->c.fi, |
| 1670 | MSC_EV_CALL_LEG_TERM, |
| 1671 | MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, |
Neels Hofmeyr | 265a4c7 | 2019-05-09 16:20:51 +0200 | [diff] [blame] | 1672 | MSC_EV_CALL_LEG_RTP_COMPLETE); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1673 | OSMO_ASSERT(cl); |
| 1674 | |
Martin Hauke | 3f07dac | 2019-11-14 17:49:08 +0100 | [diff] [blame] | 1675 | /* HACK: We put the connection in loopback mode at the beginning to |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1676 | * trick the hNodeB into doing the IuUP negotiation with itself. |
| 1677 | * This is a hack we need because osmo-mgw does not support IuUP yet, see OS#2459. */ |
| 1678 | if (msc_a->c.ran->type == OSMO_RAT_UTRAN_IU) |
| 1679 | cl->crcx_conn_mode[RTP_TO_RAN] = MGCP_CONN_LOOPBACK; |
| 1680 | } |
| 1681 | |
Pau Espin Pedrol | a3cdab4 | 2019-05-09 17:54:08 +0200 | [diff] [blame] | 1682 | if (net->use_osmux != OSMUX_USAGE_OFF) { |
| 1683 | msc_i = msc_a_msc_i(msc_a); |
| 1684 | if (msc_i->c.remote_to) { |
| 1685 | /* TODO: investigate what to do in this case */ |
| 1686 | LOG_MSC_A(msc_a, LOGL_ERROR, "Osmux not yet supported for inter-MSC"); |
| 1687 | } else { |
| 1688 | cl->ran_peer_supports_osmux = msc_i->ran_conn->ran_peer->remote_supports_osmux; |
| 1689 | } |
| 1690 | } |
| 1691 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1692 | /* This will lead to either MSC_EV_CALL_LEG_LOCAL_ADDR_AVAILABLE or MSC_EV_CALL_LEG_TERM. |
| 1693 | * If the local address is already known, then immediately trigger. */ |
| 1694 | if (call_leg_local_ip(cl, RTP_TO_RAN)) |
| 1695 | return osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_EV_CALL_LEG_RTP_LOCAL_ADDR_AVAILABLE, cl->rtp[RTP_TO_RAN]); |
| 1696 | else |
| 1697 | return call_leg_ensure_ci(msc_a->cc.call_leg, RTP_TO_RAN, cc_trans->callref, cc_trans, NULL, NULL); |
| 1698 | } |
| 1699 | |
| 1700 | int msc_a_try_call_assignment(struct gsm_trans *cc_trans) |
| 1701 | { |
| 1702 | struct msc_a *msc_a = cc_trans->msc_a; |
| 1703 | OSMO_ASSERT(cc_trans->type == TRANS_CC); |
| 1704 | |
| 1705 | if (msc_a->cc.active_trans == cc_trans) { |
Neels Hofmeyr | b4ef5e7 | 2019-08-30 01:11:12 +0200 | [diff] [blame] | 1706 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Assignment for this trans already started earlier\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1707 | return 0; |
| 1708 | } |
| 1709 | |
| 1710 | if (msc_a->cc.active_trans) { |
| 1711 | LOG_MSC_A(msc_a, LOGL_INFO, "Another call is already ongoing, not assigning yet\n"); |
| 1712 | return 0; |
| 1713 | } |
| 1714 | |
| 1715 | LOG_MSC_A(msc_a, LOGL_DEBUG, "Starting call assignment\n"); |
| 1716 | return msc_a_start_assignment(msc_a, cc_trans); |
| 1717 | } |
| 1718 | |
| 1719 | const char *msc_a_cm_service_type_to_use(enum osmo_cm_service_type cm_service_type) |
| 1720 | { |
| 1721 | switch (cm_service_type) { |
| 1722 | case GSM48_CMSERV_MO_CALL_PACKET: |
| 1723 | case GSM48_CMSERV_EMERGENCY: |
| 1724 | return MSC_A_USE_CM_SERVICE_CC; |
| 1725 | |
| 1726 | case GSM48_CMSERV_SMS: |
| 1727 | return MSC_A_USE_CM_SERVICE_SMS; |
| 1728 | |
| 1729 | case GSM48_CMSERV_SUP_SERV: |
| 1730 | return MSC_A_USE_CM_SERVICE_SS; |
| 1731 | |
| 1732 | default: |
| 1733 | return NULL; |
| 1734 | } |
| 1735 | } |
| 1736 | |
| 1737 | void msc_a_release_cn(struct msc_a *msc_a) |
| 1738 | { |
| 1739 | osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_CN_CLOSE, NULL); |
| 1740 | } |
| 1741 | |
| 1742 | void msc_a_release_mo(struct msc_a *msc_a, enum gsm48_gsm_cause gsm_cause) |
| 1743 | { |
| 1744 | osmo_fsm_inst_dispatch(msc_a->c.fi, MSC_A_EV_MO_CLOSE, NULL); |
| 1745 | } |