Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 1 | /* IuCS/IuPS Core Network interface of HNB-GW */ |
| 2 | |
| 3 | /* (C) 2015 by Harald Welte <laforge@gnumonks.org> |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU Affero General Public License as published by |
| 8 | * the Free Software Foundation; either version 3 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU Affero General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Affero General Public License |
| 17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <osmocom/core/msgb.h> |
| 22 | #include <osmocom/core/utils.h> |
| 23 | #include <osmocom/core/timer.h> |
| 24 | |
| 25 | #include <osmocom/sigtran/protocol/sua.h> |
| 26 | #include <osmocom/sigtran/sua.h> |
| 27 | #include <osmocom/sigtran/sccp_sap.h> |
| 28 | |
| 29 | #include "hnbgw.h" |
| 30 | #include "hnbgw_rua.h" |
| 31 | #include "ranap_ies_defs.h" |
| 32 | #include "ranap_msg_factory.h" |
| 33 | #include "context_map.h" |
| 34 | #include "sccp_helpers.h" |
| 35 | |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 36 | /*********************************************************************** |
| 37 | * Outbound RANAP RESET to CN |
| 38 | ***********************************************************************/ |
| 39 | |
| 40 | int hnbgw_cnlink_change_state(struct hnbgw_cnlink *cnlink, enum hnbgw_cnlink_state state); |
| 41 | |
| 42 | static int transmit_rst(struct hnbgw_cnlink *cnlink) |
| 43 | { |
| 44 | struct msgb *msg; |
| 45 | struct msgb *msgprim; |
| 46 | RANAP_CN_DomainIndicator_t domain; |
| 47 | RANAP_Cause_t cause = { |
| 48 | .present = RANAP_Cause_PR_transmissionNetwork, |
| 49 | .choice. transmissionNetwork = RANAP_CauseTransmissionNetwork_signalling_transport_resource_failure, |
| 50 | }; |
| 51 | |
| 52 | if (cnlink->is_ps) |
| 53 | domain = RANAP_CN_DomainIndicator_ps_domain; |
| 54 | else |
| 55 | domain = RANAP_CN_DomainIndicator_cs_domain; |
| 56 | |
| 57 | msg = ranap_new_msg_reset(domain, &cause); |
| 58 | |
| 59 | return sccp_tx_unitdata_msg(cnlink->sua_link, &cnlink->local_addr, |
| 60 | &cnlink->remote_addr, msg); |
| 61 | } |
| 62 | |
| 63 | /* Timer callback once T_RafC expires */ |
| 64 | static void cnlink_trafc_cb(void *data) |
| 65 | { |
| 66 | struct hnbgw_cnlink *cnlink = data; |
| 67 | |
| 68 | transmit_rst(cnlink); |
| 69 | hnbgw_cnlink_change_state(cnlink, CNLINK_S_EST_RST_TX_WAIT_ACK); |
| 70 | /* The spec states that we should abandon after a configurable |
| 71 | * number of times. We decide to simply continue trying */ |
| 72 | } |
| 73 | |
| 74 | /* change the state of a CN Link */ |
| 75 | int hnbgw_cnlink_change_state(struct hnbgw_cnlink *cnlink, enum hnbgw_cnlink_state state) |
| 76 | { |
| 77 | switch (state) { |
| 78 | case CNLINK_S_NULL: |
| 79 | case CNLINK_S_EST_PEND: |
| 80 | break; |
| 81 | case CNLINK_S_EST_CONF: |
| 82 | cnlink_trafc_cb(cnlink); |
| 83 | break; |
| 84 | case CNLINK_S_EST_RST_TX_WAIT_ACK: |
| 85 | osmo_timer_schedule(&cnlink->T_RafC, 5, 0); |
| 86 | break; |
| 87 | case CNLINK_S_EST_ACTIVE: |
| 88 | osmo_timer_del(&cnlink->T_RafC); |
| 89 | break; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /*********************************************************************** |
| 94 | * Incoming primitives from SCCP User SAP |
| 95 | ***********************************************************************/ |
| 96 | |
| 97 | static int cn_ranap_rx_reset_cmd(struct hnbgw_cnlink *cnlink, |
| 98 | RANAP_InitiatingMessage_t *imsg) |
| 99 | { |
| 100 | RANAP_ResetIEs_t ies; |
| 101 | int rc; |
| 102 | |
| 103 | rc = ranap_decode_reseties(&ies, &imsg->value); |
| 104 | /* FIXME: reset resources and return reset ack */ |
| 105 | return rc; |
| 106 | } |
| 107 | |
| 108 | static int cn_ranap_rx_reset_ack(struct hnbgw_cnlink *cnlink, |
| 109 | RANAP_SuccessfulOutcome_t *omsg) |
| 110 | { |
| 111 | RANAP_ResetAcknowledgeIEs_t ies; |
| 112 | int rc; |
| 113 | |
| 114 | rc = ranap_decode_resetacknowledgeies(&ies, &omsg->value); |
| 115 | |
| 116 | hnbgw_cnlink_change_state(cnlink, CNLINK_S_EST_ACTIVE); |
| 117 | |
| 118 | return rc; |
| 119 | } |
| 120 | |
| 121 | static int cn_ranap_rx_paging_cmd(struct hnbgw_cnlink *cnlink, |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 122 | RANAP_InitiatingMessage_t *imsg, |
| 123 | const uint8_t *data, unsigned int len) |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 124 | { |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 125 | struct hnb_gw *gw; |
| 126 | struct hnb_context *hnb; |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 127 | RANAP_PagingIEs_t ies; |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 128 | int rc = 0; |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 129 | |
| 130 | rc = ranap_decode_pagingies(&ies, &imsg->value); |
| 131 | |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 132 | /* FIXME: determine which HNBs to send this Paging command, |
| 133 | * rather than broadcasting to all HNBs */ |
| 134 | llist_for_each_entry(hnb, &gw->hnb_list, list) { |
| 135 | rc = rua_tx_udt(hnb, data, len); |
| 136 | } |
| 137 | return 0; |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static int cn_ranap_rx_initiating_msg(struct hnbgw_cnlink *cnlink, |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 141 | RANAP_InitiatingMessage_t *imsg, |
| 142 | const uint8_t *data, unsigned int len) |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 143 | { |
| 144 | int rc; |
| 145 | |
| 146 | switch (imsg->procedureCode) { |
| 147 | case RANAP_ProcedureCode_id_Reset: |
| 148 | return cn_ranap_rx_reset_cmd(cnlink, imsg); |
| 149 | case RANAP_ProcedureCode_id_Paging: |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 150 | return cn_ranap_rx_paging_cmd(cnlink, imsg, data, len); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 151 | case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */ |
| 152 | break; |
| 153 | case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */ |
| 154 | break; |
| 155 | case RANAP_ProcedureCode_id_ResetResource: /* request */ |
| 156 | case RANAP_ProcedureCode_id_InformationTransfer: |
| 157 | case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| 158 | case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| 159 | LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| 160 | "Procedure %u from CN, ignoring\n", imsg->procedureCode); |
| 161 | break; |
| 162 | default: |
| 163 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 164 | "Procedure %u from CN, ignoring\n", imsg->procedureCode); |
| 165 | break; |
| 166 | } |
| 167 | return 0; |
| 168 | } |
| 169 | |
| 170 | static int cn_ranap_rx_successful_msg(struct hnbgw_cnlink *cnlink, |
| 171 | RANAP_SuccessfulOutcome_t *omsg) |
| 172 | { |
| 173 | int rc; |
| 174 | |
| 175 | switch (omsg->procedureCode) { |
| 176 | case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */ |
| 177 | return cn_ranap_rx_reset_ack(cnlink, omsg); |
| 178 | case RANAP_ProcedureCode_id_ResetResource: /* response */ |
| 179 | case RANAP_ProcedureCode_id_InformationTransfer: |
| 180 | case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| 181 | case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| 182 | LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| 183 | "Procedure %u from CN, ignoring\n", omsg->procedureCode); |
| 184 | break; |
| 185 | default: |
| 186 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 187 | "Procedure %u from CN, ignoring\n", omsg->procedureCode); |
| 188 | break; |
| 189 | } |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 194 | static int _cn_ranap_rx(struct hnbgw_cnlink *cnlink, RANAP_RANAP_PDU_t *pdu, |
| 195 | const uint8_t *data, unsigned int len) |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 196 | { |
| 197 | int rc; |
| 198 | |
| 199 | switch (pdu->present) { |
| 200 | case RANAP_RANAP_PDU_PR_initiatingMessage: |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 201 | rc = cn_ranap_rx_initiating_msg(cnlink, &pdu->choice.initiatingMessage, |
| 202 | data, len); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 203 | break; |
| 204 | case RANAP_RANAP_PDU_PR_successfulOutcome: |
| 205 | rc = cn_ranap_rx_successful_msg(cnlink, &pdu->choice.successfulOutcome); |
| 206 | break; |
| 207 | case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| 208 | LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| 209 | "unsuccessful outcome procedure %u from CN, ignoring\n", |
| 210 | pdu->choice.unsuccessfulOutcome.procedureCode); |
| 211 | break; |
| 212 | default: |
| 213 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 214 | "presence %u from CN, ignoring\n", pdu->present); |
| 215 | break; |
| 216 | } |
| 217 | } |
| 218 | |
| 219 | static int handle_cn_ranap(struct hnbgw_cnlink *cnlink, const uint8_t *data, |
| 220 | unsigned int len) |
| 221 | { |
| 222 | RANAP_RANAP_PDU_t _pdu, *pdu = &_pdu; |
| 223 | asn_dec_rval_t dec_ret; |
| 224 | int rc; |
| 225 | |
| 226 | memset(pdu, 0, sizeof(*pdu)); |
| 227 | dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu, |
| 228 | data, len, 0, 0); |
| 229 | if (dec_ret.code != RC_OK) { |
| 230 | LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n"); |
| 231 | return rc; |
| 232 | } |
| 233 | |
Harald Welte | bc4560c | 2015-12-24 08:46:58 +0100 | [diff] [blame] | 234 | rc = _cn_ranap_rx(cnlink, pdu, data, len); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 235 | |
| 236 | return rc; |
| 237 | } |
| 238 | |
| 239 | |
| 240 | static int handle_cn_unitdata(struct hnbgw_cnlink *cnlink, |
| 241 | const struct osmo_scu_unitdata_param *param, |
| 242 | struct osmo_prim_hdr *oph) |
| 243 | { |
Harald Welte | 8c572fe | 2015-12-26 08:42:07 +0100 | [diff] [blame] | 244 | if (param->called_addr.ssn != OSMO_SCCP_SSN_RANAP) { |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 245 | LOGP(DMAIN, LOGL_NOTICE, "N-UNITDATA.ind for unknown SSN %u\n", |
| 246 | param->called_addr.ssn); |
| 247 | return -1; |
| 248 | } |
| 249 | |
| 250 | return handle_cn_ranap(cnlink, msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| 251 | } |
| 252 | |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 253 | static int handle_cn_conn_conf(void *slink, |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 254 | const struct osmo_scu_connect_param *param, |
| 255 | struct osmo_prim_hdr *oph) |
| 256 | { |
| 257 | /* we don't actually need to do anything, as RUA towards the HNB |
| 258 | * doesn't seem to know any confirmations to its CONNECT |
| 259 | * operation */ |
| 260 | |
| 261 | return 0; |
| 262 | } |
| 263 | |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 264 | static int handle_cn_data_ind(void *slink, |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 265 | const struct osmo_scu_data_param *param, |
| 266 | struct osmo_prim_hdr *oph) |
| 267 | { |
| 268 | struct hnbgw_context_map *map; |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 269 | struct hnbgw_cnlink *cnlink = osmo_sua_link_get_user_priv(slink); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 270 | |
| 271 | /* connection-oriented data is always passed transparently |
| 272 | * towards the specific HNB, via a RUA connection identified by |
| 273 | * conn_id */ |
| 274 | |
| 275 | map = context_map_by_cn(cnlink, param->conn_id); |
| 276 | if (!map) { |
| 277 | /* FIXME: Return an error / released primitive */ |
| 278 | return 0; |
| 279 | } |
| 280 | |
| 281 | return rua_tx_dt(map->hnb_ctx, map->cn_link->is_ps, map->rua_ctx_id, |
| 282 | msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| 283 | } |
| 284 | |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 285 | static int handle_cn_disc_ind(void *slink, |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 286 | const struct osmo_scu_disconn_param *param, |
| 287 | struct osmo_prim_hdr *oph) |
| 288 | { |
| 289 | struct hnbgw_context_map *map; |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 290 | struct hnbgw_cnlink *cnlink = osmo_sua_link_get_user_priv(slink); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 291 | |
| 292 | RUA_Cause_t rua_cause = { |
| 293 | .present = RUA_Cause_PR_NOTHING, |
| 294 | /* FIXME: Convert incoming SCCP cause to RUA cause */ |
| 295 | }; |
| 296 | |
| 297 | /* we need to notify the HNB associated with this connection via |
| 298 | * a RUA DISCONNECT */ |
| 299 | |
| 300 | map = context_map_by_cn(cnlink, param->conn_id); |
| 301 | if (!map) { |
| 302 | /* FIXME: Return an error / released primitive */ |
| 303 | return 0; |
| 304 | } |
| 305 | |
| 306 | return rua_tx_disc(map->hnb_ctx, map->cn_link->is_ps, map->rua_ctx_id, |
| 307 | &rua_cause, msgb_l2(oph->msg), msgb_l2len(oph->msg)); |
| 308 | } |
| 309 | |
| 310 | /* Entry point for primitives coming up from SCCP User SAP */ |
| 311 | static int sccp_sap_up(struct osmo_prim_hdr *oph, void *slink) |
| 312 | { |
| 313 | struct osmo_scu_prim *prim = (struct osmo_scu_prim *) oph; |
| 314 | int rc; |
| 315 | |
| 316 | LOGP(DMAIN, LOGL_DEBUG, "sccp_sap_up(%s)\n", osmo_scu_prim_name(oph)); |
| 317 | |
| 318 | switch (OSMO_PRIM_HDR(oph)) { |
| 319 | case OSMO_PRIM(OSMO_SCU_PRIM_N_UNITDATA, PRIM_OP_INDICATION): |
| 320 | rc = handle_cn_unitdata(slink, &prim->u.unitdata, oph); |
| 321 | break; |
| 322 | case OSMO_PRIM(OSMO_SCU_PRIM_N_CONNECT, PRIM_OP_CONFIRM): |
| 323 | rc = handle_cn_conn_conf(slink, &prim->u.connect, oph); |
| 324 | break; |
| 325 | case OSMO_PRIM(OSMO_SCU_PRIM_N_DATA, PRIM_OP_INDICATION): |
| 326 | rc = handle_cn_data_ind(slink, &prim->u.data, oph); |
| 327 | break; |
| 328 | case OSMO_PRIM(OSMO_SCU_PRIM_N_DISCONNECT, PRIM_OP_INDICATION): |
| 329 | rc = handle_cn_disc_ind(slink, &prim->u.disconnect, oph); |
| 330 | break; |
| 331 | defualt: |
| 332 | LOGP(DMAIN, LOGL_ERROR, |
| 333 | "Received unknown prim %u from SCCP USER SAP\n", |
| 334 | OSMO_PRIM_HDR(oph)); |
| 335 | break; |
| 336 | } |
| 337 | |
| 338 | msgb_free(oph->msg); |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | |
| 344 | struct hnbgw_cnlink *hnbgw_cnlink_init(struct hnb_gw *gw, const char *host, uint16_t port) |
| 345 | { |
| 346 | struct hnbgw_cnlink *cnlink = talloc_zero(gw, struct hnbgw_cnlink); |
| 347 | int rc; |
| 348 | |
| 349 | INIT_LLIST_HEAD(&cnlink->map_list); |
| 350 | cnlink->T_RafC.cb = cnlink_trafc_cb; |
| 351 | cnlink->T_RafC.data = cnlink; |
Harald Welte | 552fdf1 | 2015-12-26 23:39:30 +0100 | [diff] [blame] | 352 | cnlink->next_conn_id = 1000; |
Harald Welte | 8c572fe | 2015-12-26 08:42:07 +0100 | [diff] [blame] | 353 | sccp_make_addr_pc_ssn(&cnlink->local_addr, 2, OSMO_SCCP_SSN_RANAP); |
| 354 | sccp_make_addr_pc_ssn(&cnlink->remote_addr, 1, OSMO_SCCP_SSN_RANAP); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 355 | |
Harald Welte | 2ebe42f | 2015-12-26 23:38:38 +0100 | [diff] [blame] | 356 | cnlink->sua_user = osmo_sua_user_create(cnlink, sccp_sap_up, cnlink); |
Harald Welte | c4338de | 2015-12-24 00:40:52 +0100 | [diff] [blame] | 357 | if (!cnlink->sua_user) { |
| 358 | LOGP(DMAIN, LOGL_ERROR, "Failed to init SUA\n"); |
| 359 | goto out_free; |
| 360 | } |
| 361 | rc = osmo_sua_client_connect(cnlink->sua_user, host, port); |
| 362 | if (rc < 0) { |
| 363 | LOGP(DMAIN, LOGL_ERROR, "Failed to connect SUA\n"); |
| 364 | goto out_user; |
| 365 | } |
| 366 | cnlink->sua_link = osmo_sua_client_get_link(cnlink->sua_user); |
| 367 | if (!cnlink->sua_link) { |
| 368 | LOGP(DMAIN, LOGL_ERROR, "Failed to get SUA link\n"); |
| 369 | goto out_disconnect; |
| 370 | } |
| 371 | |
| 372 | llist_add_tail(&cnlink->list, &gw->cn_list); |
| 373 | |
| 374 | return cnlink; |
| 375 | |
| 376 | out_disconnect: |
| 377 | /* FIXME */ |
| 378 | out_user: |
| 379 | osmo_sua_user_destroy(cnlink->sua_user); |
| 380 | out_free: |
| 381 | talloc_free(cnlink); |
| 382 | } |