| /* hnb-gw specific code for RANAP */ |
| |
| /* (C) 2015 by Harald Welte <laforge@gnumonks.org> |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Affero General Public License as published by |
| * the Free Software Foundation; either version 3 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU Affero General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/utils.h> |
| |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "asn1helpers.h" |
| |
| #include <osmocom/iuh/hnbgw.h> |
| #include <osmocom/iuh/hnbgw_rua.h> |
| #include <osmocom/ranap/ranap_common.h> |
| #include <osmocom/ranap/ranap_ies_defs.h> |
| #include <osmocom/ranap/ranap_msg_factory.h> |
| |
| static int ranap_tx_reset_ack(struct hnb_context *hnb, |
| RANAP_CN_DomainIndicator_t domain) |
| { |
| struct msgb *msg; |
| int rc; |
| |
| msg = ranap_new_msg_reset_ack(domain, NULL); |
| if (!msg) |
| return -1; |
| |
| rc = rua_tx_udt(hnb, msg->data, msgb_length(msg)); |
| |
| msgb_free(msg); |
| |
| return rc; |
| } |
| |
| static int ranap_rx_init_reset(struct hnb_context *hnb, ANY_t *in) |
| { |
| RANAP_ResetIEs_t ies; |
| int rc, is_ps = 0; |
| |
| rc = ranap_decode_reseties(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| if (ies.cN_DomainIndicator == RANAP_CN_DomainIndicator_ps_domain) |
| is_ps=1; |
| |
| LOGP(DRANAP, LOGL_INFO, "Rx RESET.req(%s,%s)\n", is_ps ? "ps" : "cs", |
| ranap_cause_str(&ies.cause)); |
| |
| /* FIXME: Actually we have to wait for some guard time? */ |
| /* FIXME: Reset all resources related to this HNB/RNC */ |
| ranap_tx_reset_ack(hnb, ies.cN_DomainIndicator); |
| |
| return 0; |
| } |
| |
| static int ranap_rx_error_ind(struct hnb_context *hnb, ANY_t *in) |
| { |
| RANAP_ErrorIndicationIEs_t ies; |
| int rc; |
| |
| rc = ranap_decode_errorindicationies(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| if (ies.presenceMask & ERRORINDICATIONIES_RANAP_CAUSE_PRESENT) { |
| LOGP(DRANAP, LOGL_ERROR, "Rx ERROR.ind(%s)\n", |
| ranap_cause_str(&ies.cause)); |
| } else |
| LOGP(DRANAP, LOGL_ERROR, "Rx ERROR.ind\n"); |
| |
| return 0; |
| } |
| |
| static int ranap_rx_initiating_msg(struct hnb_context *hnb, RANAP_InitiatingMessage_t *imsg) |
| { |
| int rc = 0; |
| |
| /* according tot the spec, we can primarily receive Overload, |
| * Reset, Reset ACK, Error Indication, reset Resource, Reset |
| * Resurce Acknowledge as connecitonless RANAP. There are some |
| * more messages regarding Information Transfer, Direct |
| * Information Transfer and Uplink Information Trnansfer that we |
| * can ignore. In either case, it is RANAP that we need to |
| * decode... */ |
| switch (imsg->procedureCode) { |
| case RANAP_ProcedureCode_id_Reset: |
| /* Reset request */ |
| rc = ranap_rx_init_reset(hnb, &imsg->value); |
| break; |
| case RANAP_ProcedureCode_id_OverloadControl: /* Overload ind */ |
| break; |
| case RANAP_ProcedureCode_id_ErrorIndication: /* Error ind */ |
| rc = ranap_rx_error_ind(hnb, &imsg->value); |
| break; |
| case RANAP_ProcedureCode_id_ResetResource: /* request */ |
| case RANAP_ProcedureCode_id_InformationTransfer: |
| case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "Procedure %lu from HNB, ignoring\n", imsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %lu from HNB, ignoring\n", imsg->procedureCode); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| static int ranap_rx_successful_msg(struct hnb_context *hnb, RANAP_SuccessfulOutcome_t *imsg) |
| { |
| /* according tot the spec, we can primarily receive Overload, |
| * Reset, Reset ACK, Error Indication, reset Resource, Reset |
| * Resurce Acknowledge as connecitonless RANAP. There are some |
| * more messages regarding Information Transfer, Direct |
| * Information Transfer and Uplink Information Trnansfer that we |
| * can ignore. In either case, it is RANAP that we need to |
| * decode... */ |
| switch (imsg->procedureCode) { |
| case RANAP_ProcedureCode_id_Reset: /* Reset acknowledge */ |
| break; |
| case RANAP_ProcedureCode_id_ResetResource: /* response */ |
| case RANAP_ProcedureCode_id_InformationTransfer: |
| case RANAP_ProcedureCode_id_DirectInformationTransfer: |
| case RANAP_ProcedureCode_id_UplinkInformationExchange: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "Procedure %lu from HNB, ignoring\n", imsg->procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "Procedure %lu from HNB, ignoring\n", imsg->procedureCode); |
| break; |
| } |
| |
| return 0; |
| } |
| |
| |
| |
| static int _hnbgw_ranap_rx(struct hnb_context *hnb, RANAP_RANAP_PDU_t *pdu) |
| { |
| int rc = 0; |
| |
| switch (pdu->present) { |
| case RANAP_RANAP_PDU_PR_initiatingMessage: |
| rc = ranap_rx_initiating_msg(hnb, &pdu->choice.initiatingMessage); |
| break; |
| case RANAP_RANAP_PDU_PR_successfulOutcome: |
| rc = ranap_rx_successful_msg(hnb, &pdu->choice.successfulOutcome); |
| break; |
| case RANAP_RANAP_PDU_PR_unsuccessfulOutcome: |
| LOGP(DRANAP, LOGL_NOTICE, "Received unsupported RANAP " |
| "unsuccessful outcome procedure %lu from HNB, ignoring\n", |
| pdu->choice.unsuccessfulOutcome.procedureCode); |
| break; |
| default: |
| LOGP(DRANAP, LOGL_NOTICE, "Received suspicious RANAP " |
| "presence %u from HNB, ignoring\n", pdu->present); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| |
| int hnbgw_ranap_rx(struct msgb *msg, uint8_t *data, size_t len) |
| { |
| RANAP_RANAP_PDU_t _pdu, *pdu = &_pdu; |
| asn_dec_rval_t dec_ret; |
| int rc; |
| |
| memset(pdu, 0, sizeof(*pdu)); |
| dec_ret = aper_decode(NULL,&asn_DEF_RANAP_RANAP_PDU, (void **) &pdu, |
| data, len, 0, 0); |
| if (dec_ret.code != RC_OK) { |
| LOGP(DRANAP, LOGL_ERROR, "Error in RANAP ASN.1 decode\n"); |
| return -1; |
| } |
| |
| rc = _hnbgw_ranap_rx(msg->dst, pdu); |
| |
| return rc; |
| } |
| |
| int hnbgw_ranap_init(void) |
| { |
| return 0; |
| } |