Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 1 | /* RANAP interface for a core-network node */ |
| 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 <unistd.h> |
| 22 | #include <errno.h> |
| 23 | #include <string.h> |
| 24 | |
| 25 | #include <osmocom/core/utils.h> |
| 26 | #include <osmocom/core/logging.h> |
| 27 | |
| 28 | #include "ranap_common.h" |
| 29 | #include "ranap_ies_defs.h" |
Harald Welte | cee5a28 | 2015-12-26 08:43:31 +0100 | [diff] [blame] | 30 | #include "ranap_common_cn.h" |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 31 | |
Harald Welte | cee5a28 | 2015-12-26 08:43:31 +0100 | [diff] [blame] | 32 | #include "hnbgw.h" |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 33 | |
| 34 | static int cn_ranap_rx_initiating_msg_co(void *ctx, RANAP_InitiatingMessage_t *imsg, |
| 35 | ranap_message *message) |
| 36 | { |
| 37 | int rc = 0; |
| 38 | |
| 39 | message->procedureCode = imsg->procedureCode; |
| 40 | message->criticality = imsg->criticality; |
| 41 | |
| 42 | DEBUGP(DRANAP, "Rx CO IM (%s)\n", |
| 43 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 44 | |
| 45 | switch (imsg->procedureCode) { |
| 46 | case RANAP_ProcedureCode_id_InitialUE_Message: |
| 47 | rc = ranap_decode_initialue_messageies(&message->msg.initialUE_MessageIEs, &imsg->value); |
| 48 | break; |
| 49 | case RANAP_ProcedureCode_id_DirectTransfer: |
| 50 | rc = ranap_decode_directtransferies(&message->msg.directTransferIEs, &imsg->value); |
| 51 | break; |
| 52 | case RANAP_ProcedureCode_id_RAB_ReleaseRequest: |
| 53 | /* RNC requests the release of RAB */ |
| 54 | rc = ranap_decode_rab_releaserequesties(&message->msg.raB_ReleaseRequestIEs, &imsg->value); |
| 55 | break; |
| 56 | case RANAP_ProcedureCode_id_Iu_ReleaseRequest: |
| 57 | /* RNC requests the release of Iu */ |
| 58 | rc = ranap_decode_iu_releaserequesties(&message->msg.iu_ReleaseRequestIEs, &imsg->value); |
| 59 | break; |
| 60 | case RANAP_ProcedureCode_id_ErrorIndication: |
| 61 | rc = ranap_decode_errorindicationies(&message->msg.errorIndicationIEs, &imsg->value); |
| 62 | break; |
| 63 | case RANAP_ProcedureCode_id_RAB_ModifyRequest: |
| 64 | rc = ranap_decode_rab_modifyrequesties(&message->msg.raB_ModifyRequestIEs, &imsg->value); |
| 65 | break; |
| 66 | default: |
| 67 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 68 | "Procedure %s (CO, IM) from RNC, ignoring\n", |
| 69 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 70 | rc = -1; |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | return rc; |
| 75 | } |
| 76 | |
| 77 | static int cn_ranap_rx_successful_msg_co(void *ctx, RANAP_SuccessfulOutcome_t *imsg, |
| 78 | ranap_message *message) |
| 79 | { |
| 80 | int rc = 0; |
| 81 | |
| 82 | message->procedureCode = imsg->procedureCode; |
| 83 | message->criticality = imsg->criticality; |
| 84 | |
Harald Welte | a31e63a | 2015-12-28 13:19:35 +0100 | [diff] [blame] | 85 | DEBUGP(DRANAP, "Rx CO SO (%s)\n", |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 86 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 87 | |
| 88 | switch (imsg->procedureCode) { |
| 89 | case RANAP_ProcedureCode_id_RAB_Assignment: |
| 90 | /* RAB assignment response */ |
| 91 | rc = ranap_decode_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs, &imsg->value); |
| 92 | break; |
| 93 | case RANAP_ProcedureCode_id_SecurityModeControl: |
| 94 | /* Security Mode Complete */ |
| 95 | rc = ranap_decode_securitymodecompleteies(&message->msg.securityModeCompleteIEs, &imsg->value); |
| 96 | break; |
| 97 | case RANAP_ProcedureCode_id_Iu_Release: |
| 98 | /* Iu release Complete; confirmation of CN-initiated release */ |
| 99 | rc = ranap_decode_iu_releasecompleteies(&message->msg.iu_ReleaseCompleteIEs, &imsg->value); |
| 100 | break; |
| 101 | default: |
| 102 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 103 | "Procedure %s (SO) from RNC, ignoring\n", |
| 104 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 105 | rc = -1; |
| 106 | break; |
| 107 | } |
| 108 | |
| 109 | return rc; |
| 110 | } |
| 111 | |
Harald Welte | 7bccc98 | 2015-12-28 14:44:49 +0100 | [diff] [blame] | 112 | static int cn_ranap_rx_outcome_msg_co(void *ctx, RANAP_Outcome_t *imsg, |
| 113 | ranap_message *message) |
| 114 | { |
| 115 | int rc = 0; |
| 116 | |
| 117 | message->procedureCode = imsg->procedureCode; |
| 118 | message->criticality = imsg->criticality; |
| 119 | |
| 120 | DEBUGP(DRANAP, "Rx CO O (%s)\n", |
| 121 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 122 | |
| 123 | switch (imsg->procedureCode) { |
| 124 | case RANAP_ProcedureCode_id_RAB_Assignment: |
| 125 | /* RAB assignment response */ |
| 126 | rc = ranap_decode_rab_assignmentresponseies(&message->msg.raB_AssignmentResponseIEs, &imsg->value); |
| 127 | break; |
| 128 | default: |
| 129 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 130 | "Procedure %s (O) from RNC, ignoring\n", |
| 131 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 132 | rc = -1; |
| 133 | break; |
| 134 | } |
| 135 | |
| 136 | return rc; |
| 137 | } |
| 138 | |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 139 | static int _cn_ranap_rx_co(void *ctx, RANAP_RANAP_PDU_t *pdu, ranap_message *message) |
| 140 | { |
| 141 | int rc = 0; |
| 142 | |
| 143 | switch (pdu->present) { |
| 144 | case RANAP_RANAP_PDU_PR_initiatingMessage: |
| 145 | rc = cn_ranap_rx_initiating_msg_co(ctx, &pdu->choice.initiatingMessage, message); |
| 146 | break; |
| 147 | case RANAP_RANAP_PDU_PR_successfulOutcome: |
| 148 | rc = cn_ranap_rx_successful_msg_co(ctx, &pdu->choice.successfulOutcome, message); |
| 149 | break; |
| 150 | case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| 151 | LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| 152 | "unsuccessful outcome procedure %s (CO) from RNC, ignoring\n", |
| 153 | get_value_string(ranap_procedure_code_vals, |
| 154 | pdu->choice.unsuccessfulOutcome.procedureCode)); |
| 155 | rc = -1; |
| 156 | break; |
Harald Welte | 7bccc98 | 2015-12-28 14:44:49 +0100 | [diff] [blame] | 157 | case RANAP_RANAP_PDU_PR_outcome: |
| 158 | rc = cn_ranap_rx_outcome_msg_co(ctx, &pdu->choice.successfulOutcome, message); |
| 159 | break; |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 160 | default: |
| 161 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 162 | "presence %s (CO) from RNC, ignoring\n", |
| 163 | get_value_string(ranap_presence_vals, pdu->present)); |
| 164 | rc = -1; |
| 165 | break; |
| 166 | } |
| 167 | |
| 168 | return rc; |
| 169 | } |
| 170 | |
| 171 | /* receive a connection-oriented RANAP message and call |
| 172 | * cn_ranap_handle_co() with the resulting ranap_message struct */ |
| 173 | int cn_ranap_rx_co(void *ctx, uint8_t *data, size_t len) |
| 174 | { |
| 175 | RANAP_RANAP_PDU_t *pdu = NULL; |
| 176 | ranap_message message; |
| 177 | asn_dec_rval_t dec_ret; |
| 178 | int rc; |
| 179 | |
| 180 | memset(&message, 0, sizeof(message)); |
| 181 | |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 182 | dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu, |
| 183 | data, len, 0, 0); |
| 184 | if (dec_ret.code != RC_OK) { |
| 185 | LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n"); |
| 186 | return rc; |
| 187 | } |
| 188 | |
| 189 | message.direction = pdu->present; |
| 190 | |
| 191 | rc = _cn_ranap_rx_co(ctx, pdu, &message); |
| 192 | |
| 193 | if (rc == 0) |
| 194 | cn_ranap_handle_co(ctx, &message); |
Harald Welte | 4928797 | 2015-12-29 19:00:35 +0100 | [diff] [blame] | 195 | else |
| 196 | LOGP(DRANAP, LOGL_ERROR, "Not calling cn_ranap_handle_co() due to rc=%d\n", rc); |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 197 | |
| 198 | ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu); |
| 199 | |
| 200 | return rc; |
| 201 | } |
| 202 | |
| 203 | static int cn_ranap_rx_initiating_msg_cl(void *ctx, RANAP_InitiatingMessage_t *imsg, |
| 204 | ranap_message *message) |
| 205 | { |
| 206 | int rc; |
| 207 | |
| 208 | message->procedureCode = imsg->procedureCode; |
| 209 | message->criticality = imsg->criticality; |
| 210 | |
| 211 | DEBUGP(DRANAP, "Rx CL IM (%s)\n", |
| 212 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 213 | |
| 214 | switch (imsg->procedureCode) { |
| 215 | case RANAP_ProcedureCode_id_Reset: |
| 216 | /* Reset request */ |
| 217 | rc = ranap_decode_reseties(&message->msg.resetIEs, &imsg->value); |
| 218 | break; |
| 219 | case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */ |
| 220 | rc = ranap_decode_overloadies(&message->msg.overloadIEs, &imsg->value); |
| 221 | break; |
| 222 | case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */ |
| 223 | rc = ranap_decode_errorindicationies(&message->msg.errorIndicationIEs, &imsg->value); |
| 224 | break; |
| 225 | case RANAP_ProcedureCode_id_ResetResource: /* request */ |
| 226 | rc = ranap_decode_resetresourceies(&message->msg.resetResourceIEs, &imsg->value); |
| 227 | break; |
| 228 | case RANAP_ProcedureCode_id_InformationTransfer: |
| 229 | rc = ranap_decode_informationtransferindicationies(&message->msg.informationTransferIndicationIEs, &imsg->value); |
| 230 | break; |
| 231 | case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| 232 | rc = ranap_decode_directinformationtransferies(&message->msg.directInformationTransferIEs, &imsg->value); |
| 233 | break; |
| 234 | case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| 235 | rc = ranap_decode_uplinkinformationexchangerequesties(&message->msg.uplinkInformationExchangeRequestIEs, &imsg->value); |
| 236 | break; |
| 237 | default: |
| 238 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 239 | "Procedure %s (CL, IM) from RNC, ignoring\n", |
| 240 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 241 | break; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static int cn_ranap_rx_successful_msg_cl(void *ctx, RANAP_SuccessfulOutcome_t *imsg, |
| 246 | ranap_message *message) |
| 247 | { |
| 248 | int rc; |
| 249 | |
| 250 | message->procedureCode = imsg->procedureCode; |
| 251 | message->criticality = imsg->criticality; |
| 252 | |
| 253 | DEBUGP(DRANAP, "Rx CL SO (%s)\n", |
| 254 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 255 | |
| 256 | switch (imsg->procedureCode) { |
| 257 | case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */ |
| 258 | rc = ranap_decode_resetacknowledgeies(&message->msg.resetAcknowledgeIEs, &imsg->value); |
| 259 | break; |
| 260 | case RANAP_ProcedureCode_id_ResetResource: /* response */ |
| 261 | rc = ranap_decode_resetresourceacknowledgeies(&message->msg.resetResourceAcknowledgeIEs, &imsg->value); |
| 262 | case RANAP_ProcedureCode_id_InformationTransfer: |
| 263 | rc = ranap_decode_resetresourceacknowledgeies(&message->msg.resetResourceAcknowledgeIEs, &imsg->value); |
| 264 | break; |
| 265 | case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| 266 | rc = ranap_decode_informationtransferconfirmationies(&message->msg.informationTransferConfirmationIEs, &imsg->value); |
| 267 | break; |
| 268 | case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| 269 | rc = ranap_decode_uplinkinformationexchangeresponseies(&message->msg.uplinkInformationExchangeResponseIEs, &imsg->value); |
| 270 | break; |
| 271 | default: |
| 272 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 273 | "Procedure %s (CL, SO) from RNC, ignoring\n", |
| 274 | get_value_string(ranap_procedure_code_vals, imsg->procedureCode)); |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | static int _cn_ranap_rx_cl(void *ctx, RANAP_RANAP_PDU_t *pdu, ranap_message *message) |
| 280 | { |
| 281 | int rc; |
| 282 | |
| 283 | switch (pdu->present) { |
| 284 | case RANAP_RANAP_PDU_PR_initiatingMessage: |
| 285 | rc = cn_ranap_rx_initiating_msg_cl(ctx, &pdu->choice.initiatingMessage, |
| 286 | message); |
| 287 | break; |
| 288 | case RANAP_RANAP_PDU_PR_successfulOutcome: |
| 289 | rc = cn_ranap_rx_successful_msg_cl(ctx, &pdu->choice.successfulOutcome, |
| 290 | message); |
| 291 | break; |
| 292 | case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| 293 | LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| 294 | "unsuccessful outcome procedure %s (CL) from RNC, ignoring\n", |
| 295 | get_value_string(ranap_procedure_code_vals, |
| 296 | pdu->choice.unsuccessfulOutcome.procedureCode)); |
| 297 | break; |
| 298 | default: |
| 299 | LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| 300 | "presence %s (CL) from RNC, ignoring\n", |
| 301 | get_value_string(ranap_presence_vals, pdu->present)); |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | /* receive a connection-oriented RANAP message and call |
| 307 | * cn_ranap_handle_co() with the resulting ranap_message struct */ |
| 308 | int cn_ranap_rx_cl(void *ctx, uint8_t *data, size_t len) |
| 309 | { |
| 310 | RANAP_RANAP_PDU_t *pdu = NULL; |
| 311 | ranap_message message; |
| 312 | asn_dec_rval_t dec_ret; |
| 313 | int rc; |
| 314 | |
| 315 | memset(&message, 0, sizeof(message)); |
| 316 | |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 317 | dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu, |
| 318 | data, len, 0, 0); |
| 319 | if (dec_ret.code != RC_OK) { |
| 320 | LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n"); |
| 321 | return rc; |
| 322 | } |
| 323 | |
| 324 | message.direction = pdu->present; |
| 325 | |
| 326 | rc = _cn_ranap_rx_cl(ctx, pdu, &message); |
| 327 | |
| 328 | if (rc == 0) |
| 329 | cn_ranap_handle_cl(ctx, &message); |
Harald Welte | 4928797 | 2015-12-29 19:00:35 +0100 | [diff] [blame] | 330 | else |
| 331 | LOGP(DRANAP, LOGL_ERROR, "Not calling cn_ranap_handle_cl() due to rc=%d\n", rc); |
Harald Welte | 3cfa450 | 2015-12-25 15:33:41 +0100 | [diff] [blame] | 332 | |
| 333 | ASN_STRUCT_FREE(asn_DEF_RANAP_RANAP_PDU, pdu); |
| 334 | |
| 335 | return rc; |
| 336 | } |