Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 1 | /* RANAP encoding and decoding for MSC */ |
| 2 | /* |
| 3 | * (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de> |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * Author: Neels Hofmeyr |
| 7 | * |
| 8 | * SPDX-License-Identifier: GPL-2.0+ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 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 General Public License for more details. |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 19 | */ |
| 20 | |
| 21 | #include <asn1c/asn1helpers.h> |
| 22 | |
| 23 | #include <osmocom/core/prim.h> |
| 24 | #include <osmocom/core/byteswap.h> |
| 25 | #include <osmocom/crypt/auth.h> |
Alexander Couzens | 8b7d785 | 2021-11-05 01:52:05 +0100 | [diff] [blame] | 26 | #include <osmocom/crypt/utran_cipher.h> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 27 | #include <osmocom/gsm/gsm48.h> |
| 28 | |
| 29 | #include <osmocom/ranap/ranap_common_cn.h> |
| 30 | #include <osmocom/ranap/ranap_msg_factory.h> |
| 31 | #include <osmocom/ranap/iu_helpers.h> |
| 32 | |
| 33 | #include <osmocom/msc/debug.h> |
| 34 | #include <osmocom/msc/msc_common.h> |
| 35 | #include <osmocom/msc/sccp_ran.h> |
| 36 | #include <osmocom/msc/ran_msg_iu.h> |
Vadim Yanitskiy | 1c50044 | 2019-06-20 06:34:49 +0700 | [diff] [blame] | 37 | #include <osmocom/msc/gsm_04_11.h> |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 38 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 39 | #define LOG_RAN_IU_DEC(RAN_DEC, level, fmt, args...) \ |
| 40 | LOG_RAN_DEC(RAN_DEC, DIUCS, level, "RANAP: " fmt, ## args) |
| 41 | |
| 42 | #define LOG_RAN_IU_ENC(FI, level, fmt, args...) \ |
| 43 | LOG_RAN_ENC(FI, DIUCS, level, "RANAP: " fmt, ## args) |
| 44 | |
| 45 | static void ran_iu_decode_l3_initial(struct ran_dec *ran_iu_decode, const RANAP_InitialUE_MessageIEs_t *ies, const char *msg_name) |
| 46 | { |
| 47 | struct msgb *ran = msgb_alloc(256, msg_name); |
| 48 | struct ran_msg ran_dec_msg; |
| 49 | |
| 50 | struct osmo_plmn_id plmn; |
| 51 | |
| 52 | if (ies->lai.pLMNidentity.size < 3) { |
| 53 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Too short PLMNidentity in RANAP InitialUE message\n"); |
| 54 | return; |
| 55 | } |
| 56 | osmo_plmn_from_bcd(ies->lai.pLMNidentity.buf, &plmn); |
| 57 | |
| 58 | struct gsm0808_cell_id cid = { |
| 59 | .id_discr = CELL_IDENT_LAI, |
| 60 | .id.lai_and_lac = { |
| 61 | .plmn = plmn, |
| 62 | .lac = asn1str_to_u16(&ies->lai.lAC), |
| 63 | }, |
| 64 | }; |
| 65 | |
| 66 | /* TODO: really necessary to copy the RAN PDU?? */ |
| 67 | ran->l3h = msgb_put(ran, ies->nas_pdu.size); |
| 68 | memcpy(ran->l3h, ies->nas_pdu.buf, ies->nas_pdu.size); |
| 69 | |
| 70 | ran_dec_msg = (struct ran_msg){ |
| 71 | .msg_type = RAN_MSG_COMPL_L3, |
| 72 | .msg_name = msg_name, |
| 73 | .compl_l3 = { |
| 74 | .cell_id = &cid, |
| 75 | .msg = ran, |
| 76 | }, |
| 77 | }; |
| 78 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 79 | |
| 80 | msgb_free(ran); |
| 81 | } |
| 82 | |
Vadim Yanitskiy | 1c50044 | 2019-06-20 06:34:49 +0700 | [diff] [blame] | 83 | static void ran_iu_decode_l3(struct ran_dec *ran_iu_decode, |
| 84 | const RANAP_DirectTransferIEs_t *ies, |
| 85 | const char *msg_name) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 86 | { |
Vadim Yanitskiy | 1c50044 | 2019-06-20 06:34:49 +0700 | [diff] [blame] | 87 | const RANAP_NAS_PDU_t *nas_pdu = &ies->nas_pdu; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 88 | struct msgb *ran = msgb_alloc(256, msg_name); |
| 89 | struct ran_msg ran_dec_msg; |
| 90 | |
| 91 | /* TODO: really necessary to copy the RAN PDU?? */ |
| 92 | ran->l3h = msgb_put(ran, nas_pdu->size); |
| 93 | memcpy(ran->l3h, nas_pdu->buf, nas_pdu->size); |
| 94 | |
Vadim Yanitskiy | 1c50044 | 2019-06-20 06:34:49 +0700 | [diff] [blame] | 95 | /* Handle optional SAPI IE */ |
| 96 | if (ies->presenceMask & DIRECTTRANSFERIES_RANAP_SAPI_PRESENT) { |
| 97 | if (ies->sapi == RANAP_SAPI_sapi_3) |
| 98 | OMSC_LINKID_CB(ran) = UM_SAPI_SMS; |
| 99 | } |
| 100 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 101 | ran_dec_msg = (struct ran_msg){ |
| 102 | .msg_type = RAN_MSG_DTAP, |
| 103 | .msg_name = msg_name, |
| 104 | .dtap = ran, |
| 105 | }; |
| 106 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 107 | |
| 108 | msgb_free(ran); |
| 109 | } |
| 110 | |
| 111 | static void ran_iu_decode_err(struct ran_dec *ran_iu_decode, const RANAP_ErrorIndicationIEs_t *ies) |
| 112 | { |
| 113 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Rx Error Indication (%s)\n", |
| 114 | (ies->presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT)? |
| 115 | ranap_cause_str(&ies->cause) : "no cause specified"); |
| 116 | } |
| 117 | |
| 118 | static int ran_iu_decode_rab_assignment_response_decode_setup_ies(struct ran_dec *ran_iu_decode, |
| 119 | struct ran_msg *ran_dec_msg, |
| 120 | const RANAP_RAB_SetupOrModifiedItemIEs_t *setup_ies) |
| 121 | { |
| 122 | const RANAP_RAB_SetupOrModifiedItem_t *item; |
| 123 | const RANAP_TransportLayerAddress_t *transp_layer_addr; |
| 124 | const RANAP_IuTransportAssociation_t *transp_assoc; |
| 125 | uint16_t port = 0; |
| 126 | char addr[INET_ADDRSTRLEN]; |
| 127 | uint8_t rab_id; |
| 128 | |
| 129 | item = &setup_ies->raB_SetupOrModifiedItem; |
| 130 | |
| 131 | rab_id = item->rAB_ID.buf[0]; |
| 132 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_DEBUG, "Received RAB assignment response for rab_id=%d\n", rab_id); |
| 133 | |
| 134 | if (!(item->iuTransportAssociation && item->transportLayerAddress)) { |
| 135 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "RAB Assignment Response does not contain RAB information\n"); |
| 136 | return -1; |
| 137 | } |
| 138 | |
| 139 | transp_layer_addr = item->transportLayerAddress; |
| 140 | transp_assoc = item->iuTransportAssociation; |
| 141 | |
| 142 | if (ranap_transp_assoc_decode(&port, transp_assoc)) { |
| 143 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Unable to decode RTP port in RAB Assignment Response\n"); |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | if (ranap_transp_layer_addr_decode(addr, sizeof(addr), transp_layer_addr)) { |
| 148 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Unable to decode IP-Address in RAB Assignment Response\n"); |
| 149 | return -1; |
| 150 | } |
| 151 | |
| 152 | *ran_dec_msg = (struct ran_msg){ |
| 153 | .msg_type = RAN_MSG_ASSIGNMENT_COMPLETE, |
| 154 | .msg_name = "RANAP RAB Assignment Response", |
| 155 | .assignment_complete = { |
Pau Espin Pedrol | d795531 | 2022-01-07 18:45:50 +0100 | [diff] [blame] | 156 | .codec_present = true, |
| 157 | .codec = CODEC_IUFP, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 158 | }, |
| 159 | }; |
| 160 | if (osmo_sockaddr_str_from_str(&ran_dec_msg->assignment_complete.remote_rtp, addr, port)) { |
| 161 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Assignment Complete: unable to decode remote RTP IP address %s\n", |
| 162 | osmo_quote_str(addr, -1)); |
| 163 | return -1; |
| 164 | } |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | static void ran_iu_decode_rab_assignment_response(struct ran_dec *ran_iu_decode, const RANAP_RAB_AssignmentResponseIEs_t *ies) |
| 169 | { |
| 170 | int rc; |
| 171 | RANAP_IE_t *ranap_ie; |
| 172 | RANAP_RAB_SetupOrModifiedItemIEs_t setup_ies; |
| 173 | struct ran_msg ran_dec_msg; |
| 174 | bool free_ies = false; |
| 175 | |
| 176 | if (!(ies->presenceMask & RAB_ASSIGNMENTRESPONSEIES_RANAP_RAB_SETUPORMODIFIEDLIST_PRESENT)) { |
| 177 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "RAB Assignment Response does not contain RAB information\n"); |
| 178 | goto failure; |
| 179 | } |
| 180 | |
| 181 | /* So far we assign a single RAB at a time, so it should not be necessary to iterate over the list of |
| 182 | * SetupOrModifiedList IEs and handle each one. */ |
| 183 | ranap_ie = ies->raB_SetupOrModifiedList.raB_SetupOrModifiedList_ies.list.array[0]; |
| 184 | |
| 185 | rc = ranap_decode_rab_setupormodifieditemies_fromlist(&setup_ies, &ranap_ie->value); |
| 186 | if (rc) { |
| 187 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Error in ranap_decode_rab_setupormodifieditemies(): rc=%d\n", rc); |
| 188 | goto failure; |
| 189 | } |
| 190 | free_ies = true; |
| 191 | |
| 192 | if (!ran_iu_decode_rab_assignment_response_decode_setup_ies(ran_iu_decode, &ran_dec_msg, &setup_ies)) |
| 193 | goto success; |
| 194 | |
| 195 | failure: |
| 196 | ran_dec_msg = (struct ran_msg){ |
| 197 | .msg_type = RAN_MSG_ASSIGNMENT_FAILURE, |
| 198 | .msg_name = "RANAP RAB Assignment Response: Failure", |
| 199 | .assignment_failure = { |
| 200 | .bssap_cause = RAN_MSG_BSSAP_CAUSE_UNSET, |
| 201 | .rr_cause = GSM48_RR_CAUSE_ABNORMAL_UNSPEC, |
| 202 | }, |
| 203 | }; |
| 204 | |
| 205 | success: |
| 206 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 207 | |
| 208 | if (free_ies) |
| 209 | ranap_free_rab_setupormodifieditemies(&setup_ies); |
| 210 | } |
| 211 | |
Alexander Couzens | 2aaff75 | 2021-10-19 17:09:11 +0200 | [diff] [blame] | 212 | static void ran_iu_decode_security_mode_complete(struct ran_dec *ran_iu_decode, const RANAP_SecurityModeCompleteIEs_t *ies) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 213 | { |
| 214 | struct ran_msg ran_dec_msg = { |
| 215 | .msg_type = RAN_MSG_CIPHER_MODE_COMPLETE, |
| 216 | .msg_name = "RANAP SecurityModeControl successfulOutcome", |
Alexander Couzens | 2aaff75 | 2021-10-19 17:09:11 +0200 | [diff] [blame] | 217 | .cipher_mode_complete = { |
| 218 | .utran_integrity = ies->chosenIntegrityProtectionAlgorithm, |
| 219 | .utran_encryption = -1, |
| 220 | }, |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 221 | }; |
Alexander Couzens | 2aaff75 | 2021-10-19 17:09:11 +0200 | [diff] [blame] | 222 | |
| 223 | if (ies->presenceMask & SECURITYMODECOMPLETEIES_RANAP_CHOSENENCRYPTIONALGORITHM_PRESENT) |
| 224 | ran_dec_msg.cipher_mode_complete.utran_encryption = ies->chosenEncryptionAlgorithm; |
| 225 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 226 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 227 | } |
| 228 | |
| 229 | static void ran_iu_decode_security_mode_reject(struct ran_dec *ran_iu_decode) |
| 230 | { |
| 231 | struct ran_msg ran_dec_msg = { |
| 232 | .msg_type = RAN_MSG_CIPHER_MODE_REJECT, |
| 233 | .msg_name = "RANAP SecurityModeControl unsuccessfulOutcome", |
| 234 | .cipher_mode_reject = { |
| 235 | .bssap_cause = RAN_MSG_BSSAP_CAUSE_UNSET, |
| 236 | }, |
| 237 | }; |
| 238 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 239 | } |
| 240 | |
| 241 | static void ran_iu_decode_release_request(struct ran_dec *ran_iu_decode) |
| 242 | { |
| 243 | struct ran_msg ran_dec_msg = { |
| 244 | .msg_type = RAN_MSG_CLEAR_REQUEST, |
| 245 | .msg_name = "RANAP Iu ReleaseRequest", |
| 246 | .clear_request = { |
| 247 | .bssap_cause = RAN_MSG_BSSAP_CAUSE_UNSET, |
| 248 | }, |
| 249 | }; |
| 250 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 251 | } |
| 252 | |
| 253 | static void ran_iu_decode_release_complete(struct ran_dec *ran_iu_decode) |
| 254 | { |
| 255 | struct ran_msg ran_dec_msg = { |
| 256 | .msg_type = RAN_MSG_CLEAR_COMPLETE, |
| 257 | .msg_name = "RANAP Iu Release successfulOutcome", |
| 258 | }; |
| 259 | ran_decoded(ran_iu_decode, &ran_dec_msg); |
| 260 | } |
| 261 | |
| 262 | static void ran_iu_decode_ranap_msg(void *_ran_dec, ranap_message *message) |
| 263 | { |
| 264 | struct ran_dec *ran_iu_decode = _ran_dec; |
| 265 | |
| 266 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_DEBUG, "dir=%u proc=%u\n", message->direction, message->procedureCode); |
| 267 | |
| 268 | switch (message->procedureCode) { |
| 269 | |
| 270 | case RANAP_ProcedureCode_id_InitialUE_Message: |
| 271 | ran_iu_decode_l3_initial(ran_iu_decode, &message->msg.initialUE_MessageIEs, "RANAP InitialUE RAN PDU"); |
| 272 | return; |
| 273 | |
| 274 | case RANAP_ProcedureCode_id_DirectTransfer: |
Vadim Yanitskiy | 1c50044 | 2019-06-20 06:34:49 +0700 | [diff] [blame] | 275 | ran_iu_decode_l3(ran_iu_decode, &message->msg.directTransferIEs, "RANAP DirectTransfer RAN PDU"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 276 | return; |
| 277 | |
| 278 | case RANAP_ProcedureCode_id_SecurityModeControl: |
| 279 | switch (message->direction) { |
| 280 | case RANAP_RANAP_PDU_PR_successfulOutcome: |
Alexander Couzens | 2aaff75 | 2021-10-19 17:09:11 +0200 | [diff] [blame] | 281 | ran_iu_decode_security_mode_complete(ran_iu_decode, &message->msg.securityModeCompleteIEs); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 282 | return; |
| 283 | case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| 284 | ran_iu_decode_security_mode_reject(ran_iu_decode); |
| 285 | return; |
| 286 | default: |
| 287 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, |
| 288 | "Received SecurityModeControl: unexpected RANAP ProcedureCode: %d\n", |
| 289 | message->direction); |
| 290 | return; |
| 291 | } |
| 292 | |
| 293 | case RANAP_ProcedureCode_id_RAB_Assignment: |
| 294 | /* This should always be a RANAP_RANAP_PDU_PR_outcome. No need to check for that. */ |
| 295 | ran_iu_decode_rab_assignment_response(ran_iu_decode, &message->msg.raB_AssignmentResponseIEs); |
| 296 | return; |
| 297 | |
| 298 | case RANAP_ProcedureCode_id_Iu_ReleaseRequest: |
| 299 | ran_iu_decode_release_request(ran_iu_decode); |
| 300 | return; |
| 301 | |
| 302 | case RANAP_ProcedureCode_id_Iu_Release: |
| 303 | if (message->direction != RANAP_RANAP_PDU_PR_successfulOutcome) { |
| 304 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Received Iu_Release: expected successfulOutcome, got %d\n", |
| 305 | message->direction); |
| 306 | return; |
| 307 | } |
| 308 | ran_iu_decode_release_complete(ran_iu_decode); |
| 309 | return; |
| 310 | |
| 311 | case RANAP_ProcedureCode_id_ErrorIndication: |
| 312 | ran_iu_decode_err(ran_iu_decode, &message->msg.errorIndicationIEs); |
| 313 | return; |
| 314 | |
| 315 | default: |
| 316 | LOG_RAN_IU_DEC(ran_iu_decode, LOGL_ERROR, "Received unhandled RANAP Procedure Code %d\n", message->procedureCode); |
| 317 | return; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | int ran_iu_decode_l2(struct ran_dec *ran_iu_decode, struct msgb *ranap) |
| 322 | { |
| 323 | return ranap_cn_rx_co(ran_iu_decode_ranap_msg, ran_iu_decode, msgb_l2(ranap), msgb_l2len(ranap)); |
| 324 | } |
| 325 | |
| 326 | /* Create a RANAP Initiating DirectTransfer message containing the given DTAP as RAN PDU, and return the resulting |
| 327 | * AN-APDU to be forwarded via E-interface. */ |
| 328 | static struct msgb *ran_iu_wrap_dtap(struct msgb *dtap) |
| 329 | { |
| 330 | struct msgb *an_apdu; |
Harald Welte | 4dd150a | 2019-05-10 23:54:15 +0200 | [diff] [blame] | 331 | uint8_t sapi = OMSC_LINKID_CB(dtap); |
| 332 | |
| 333 | an_apdu = ranap_new_msg_dt(sapi, dtap->data, msgb_length(dtap)); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 334 | an_apdu->l2h = an_apdu->data; |
| 335 | msgb_free(dtap); |
| 336 | return an_apdu; |
| 337 | } |
| 338 | |
| 339 | static struct msgb *ran_iu_make_rab_assignment(struct osmo_fsm_inst *caller_fi, const struct ran_assignment_command *ac) |
| 340 | { |
| 341 | struct msgb *msg; |
| 342 | bool use_x213_nsap; |
| 343 | uint32_t cn_rtp_ip; |
| 344 | static uint8_t next_rab_id = 1; |
| 345 | uint8_t rab_id = next_rab_id; |
| 346 | |
| 347 | next_rab_id ++; |
| 348 | if (!next_rab_id) |
| 349 | next_rab_id = 1; |
| 350 | |
| 351 | cn_rtp_ip = osmo_htonl(inet_addr(ac->cn_rtp->ip)); |
| 352 | |
| 353 | if (cn_rtp_ip == INADDR_NONE) { |
| 354 | LOG_RAN_IU_ENC(caller_fi, LOGL_ERROR, "Error during RAB Assignment: invalid RTP IP-Address\n"); |
| 355 | return NULL; |
| 356 | } |
| 357 | if (ac->cn_rtp->port == 0) { |
| 358 | LOG_RAN_IU_ENC(caller_fi, LOGL_ERROR, "Error during RAB Assignment: invalid RTP port\n"); |
| 359 | return NULL; |
| 360 | } |
| 361 | |
| 362 | use_x213_nsap = (ac->rab_assign_addr_enc == NSAP_ADDR_ENC_X213); |
| 363 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "RAB Assignment: rab_id=%d, rtp=" OSMO_SOCKADDR_STR_FMT ", use_x213_nsap=%d\n", |
| 364 | rab_id, OSMO_SOCKADDR_STR_FMT_ARGS(ac->cn_rtp), use_x213_nsap); |
| 365 | |
| 366 | msg = ranap_new_msg_rab_assign_voice(rab_id, cn_rtp_ip, ac->cn_rtp->port, use_x213_nsap); |
| 367 | msg->l2h = msg->data; |
| 368 | |
| 369 | return msg; |
| 370 | } |
| 371 | |
| 372 | static struct msgb *ran_iu_make_security_mode_command(struct osmo_fsm_inst *caller_fi, |
| 373 | const struct ran_cipher_mode_command *cm) |
| 374 | { |
Vadim Yanitskiy | d405bad | 2021-11-29 00:58:02 +0300 | [diff] [blame] | 375 | /* TODO: make the choice of available UIA algorithms configurable */ |
| 376 | const uint8_t uia_mask = (1 << OSMO_UTRAN_UIA1) | (1 << OSMO_UTRAN_UIA2); |
Alexander Couzens | e400b11 | 2021-11-26 23:57:10 +0100 | [diff] [blame] | 377 | const uint8_t uea_mask = cm->utran.uea_encryption_mask & ~(1 << OSMO_UTRAN_UEA0); |
| 378 | bool use_encryption = uea_mask != 0x00; |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 379 | |
Harald Welte | 505a94a | 2021-02-06 17:12:20 +0100 | [diff] [blame] | 380 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "Tx RANAP SECURITY MODE COMMAND to RNC, IK=%s, CK=%s\n", |
| 381 | osmo_hexdump_nospc(cm->vec->ik, 16), |
Vadim Yanitskiy | 35db146 | 2021-11-29 00:54:11 +0300 | [diff] [blame] | 382 | use_encryption ? osmo_hexdump_nospc(cm->vec->ck, 16) : "NONE"); |
Harald Welte | 505a94a | 2021-02-06 17:12:20 +0100 | [diff] [blame] | 383 | /* TODO: Do we need to check if the UE supports all of the algorithms and build an intersection like |
| 384 | * in the case of A5? */ |
Vadim Yanitskiy | 35db146 | 2021-11-29 00:54:11 +0300 | [diff] [blame] | 385 | return ranap_new_msg_sec_mod_cmd2(cm->vec->ik, |
| 386 | use_encryption ? cm->vec->ck : NULL, |
Vadim Yanitskiy | d405bad | 2021-11-29 00:58:02 +0300 | [diff] [blame] | 387 | RANAP_KeyStatus_new, |
| 388 | (uia_mask << 1), /* API treats LSB as UIA0 */ |
Alexander Couzens | e400b11 | 2021-11-26 23:57:10 +0100 | [diff] [blame] | 389 | uea_mask); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | |
| 393 | static struct msgb *ran_iu_make_release_command(struct osmo_fsm_inst *caller_fi, |
| 394 | const struct ran_clear_command *ccmd) |
| 395 | { |
| 396 | static const struct RANAP_Cause cause = { |
| 397 | .present = RANAP_Cause_PR_radioNetwork, |
| 398 | .choice.radioNetwork = RANAP_CauseRadioNetwork_release_due_to_utran_generated_reason, |
| 399 | /* TODO: set various causes depending on the ran_clear_command cause value */ |
| 400 | }; |
| 401 | return ranap_new_msg_iu_rel_cmd(&cause); |
| 402 | } |
| 403 | |
| 404 | struct msgb *ran_iu_encode(struct osmo_fsm_inst *caller_fi, const struct ran_msg *ran_enc_msg) |
| 405 | { |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 406 | switch (ran_enc_msg->msg_type) { |
| 407 | |
| 408 | case RAN_MSG_DTAP: |
Neels Hofmeyr | fe5ae8e | 2019-10-08 06:25:06 +0200 | [diff] [blame] | 409 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "DirectTransfer\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 410 | return ran_iu_wrap_dtap(ran_enc_msg->dtap); |
| 411 | |
| 412 | // TODO: RAN_MSG_CLASSMARK_REQUEST ?? |
| 413 | |
| 414 | case RAN_MSG_CIPHER_MODE_COMMAND: |
Neels Hofmeyr | fe5ae8e | 2019-10-08 06:25:06 +0200 | [diff] [blame] | 415 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "SecurityModeCommand\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 416 | return ran_iu_make_security_mode_command(caller_fi, &ran_enc_msg->cipher_mode_command); |
| 417 | |
| 418 | case RAN_MSG_ASSIGNMENT_COMMAND: |
Neels Hofmeyr | fe5ae8e | 2019-10-08 06:25:06 +0200 | [diff] [blame] | 419 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "RAB AssignmentRequest\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 420 | return ran_iu_make_rab_assignment(caller_fi, &ran_enc_msg->assignment_command); |
| 421 | |
| 422 | case RAN_MSG_COMMON_ID: |
Neels Hofmeyr | fe5ae8e | 2019-10-08 06:25:06 +0200 | [diff] [blame] | 423 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "CommonId\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 424 | return ranap_new_msg_common_id(ran_enc_msg->common_id.imsi); |
| 425 | |
| 426 | case RAN_MSG_CLEAR_COMMAND: |
Neels Hofmeyr | fe5ae8e | 2019-10-08 06:25:06 +0200 | [diff] [blame] | 427 | LOG_RAN_IU_ENC(caller_fi, LOGL_DEBUG, "Iu Release\n"); |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 428 | return ran_iu_make_release_command(caller_fi, &ran_enc_msg->clear_command); |
| 429 | |
| 430 | default: |
| 431 | LOG_RAN_IU_ENC(caller_fi, LOGL_ERROR, "Message type not implemented: %s\n", |
| 432 | ran_msg_type_name(ran_enc_msg->msg_type)); |
| 433 | return NULL; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | /* Entry point for connection-less RANAP message */ |
| 438 | static void ranap_handle_cl(void *ctx, ranap_message *message) |
| 439 | { |
| 440 | int *rc = ctx; |
| 441 | *rc = SCCP_RAN_MSG_NON_RESET; |
| 442 | |
| 443 | if (message->procedureCode != RANAP_ProcedureCode_id_Reset) |
| 444 | return; |
| 445 | |
| 446 | switch (message->direction) { |
| 447 | case RANAP_RANAP_PDU_PR_initiatingMessage: |
| 448 | *rc = SCCP_RAN_MSG_RESET; |
| 449 | return; |
| 450 | case RANAP_RANAP_PDU_PR_successfulOutcome: |
| 451 | *rc = SCCP_RAN_MSG_RESET_ACK; |
| 452 | return; |
| 453 | default: |
| 454 | return; |
| 455 | } |
| 456 | } |
| 457 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 458 | enum reset_msg_type ranap_is_reset_msg(const struct sccp_ran_inst *sri, struct osmo_fsm_inst *log_fi, |
| 459 | struct msgb *l2, int *supports_osmux) |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 460 | { |
| 461 | int ret = SCCP_RAN_MSG_NON_RESET; |
| 462 | int rc; |
| 463 | |
Neels Hofmeyr | b697274 | 2020-06-26 15:20:51 +0200 | [diff] [blame] | 464 | if (supports_osmux != NULL) |
| 465 | *supports_osmux = -1; |
| 466 | |
Neels Hofmeyr | c4628a3 | 2018-12-07 14:47:34 +0100 | [diff] [blame] | 467 | rc = ranap_cn_rx_cl(ranap_handle_cl, &ret, msgb_l2(l2), msgb_l2len(l2)); |
| 468 | if (rc) |
| 469 | return 0; |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | struct msgb *ranap_make_reset_msg(const struct sccp_ran_inst *sri, enum reset_msg_type type) |
| 474 | { |
| 475 | const RANAP_Cause_t cause = { |
| 476 | .present = RANAP_Cause_PR_protocol, |
| 477 | .choice = { |
| 478 | .protocol = RANAP_CauseProtocol_message_not_compatible_with_receiver_state, |
| 479 | }, |
| 480 | }; |
| 481 | switch (type) { |
| 482 | case SCCP_RAN_MSG_RESET: |
| 483 | return ranap_new_msg_reset(RANAP_CN_DomainIndicator_cs_domain, &cause); |
| 484 | case SCCP_RAN_MSG_RESET_ACK: |
| 485 | return ranap_new_msg_reset_ack(RANAP_CN_DomainIndicator_cs_domain, NULL); |
| 486 | default: |
| 487 | return NULL; |
| 488 | } |
| 489 | } |
| 490 | |
| 491 | static e_RANAP_PagingCause ranap_paging_cause_from_msc(enum paging_cause cause) |
| 492 | { |
| 493 | switch (cause) { |
| 494 | default: |
| 495 | case PAGING_CAUSE_UNSPECIFIED: |
| 496 | case PAGING_CAUSE_CALL_CONVERSATIONAL: |
| 497 | return RANAP_PagingCause_terminating_conversational_call; |
| 498 | case PAGING_CAUSE_CALL_STREAMING: |
| 499 | return RANAP_PagingCause_terminating_streaming_call; |
| 500 | case PAGING_CAUSE_CALL_INTERACTIVE: |
| 501 | return RANAP_PagingCause_terminating_interactive_call; |
| 502 | case PAGING_CAUSE_CALL_BACKGROUND: |
| 503 | return RANAP_PagingCause_terminating_background_call; |
| 504 | case PAGING_CAUSE_SIGNALLING_LOW_PRIO: |
| 505 | return RANAP_PagingCause_terminating_low_priority_signalling; |
| 506 | case PAGING_CAUSE_SIGNALLING_HIGH_PRIO: |
| 507 | return RANAP_PagingCause_terminating_high_priority_signalling; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | struct msgb *ranap_make_paging_msg(const struct sccp_ran_inst *sri, const struct gsm0808_cell_id *page_cell_id, |
| 512 | const char *imsi, uint32_t tmsi, enum paging_cause cause) |
| 513 | { |
| 514 | return ranap_new_msg_paging_cmd(imsi, tmsi == GSM_RESERVED_TMSI ? NULL : &tmsi, false, |
| 515 | ranap_paging_cause_from_msc(cause)); |
| 516 | } |
| 517 | |
| 518 | const char *ranap_msg_name(const struct sccp_ran_inst *sri, const struct msgb *l2) |
| 519 | { |
| 520 | uint8_t msgt; |
| 521 | uint8_t procedure; |
| 522 | static char buf[32]; |
| 523 | if (!l2->l2h) |
| 524 | return "?"; |
| 525 | |
| 526 | msgt = l2->l2h[0]; |
| 527 | procedure = l2->l2h[1]; |
| 528 | |
| 529 | snprintf(buf, sizeof(buf), "type %u procedureCode %u", msgt, procedure); |
| 530 | return buf; |
| 531 | } |