| /* hnb-gw specific code for HNBAP */ |
| |
| /* (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 <osmocom/gsm/gsm48.h> |
| |
| #include <unistd.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "asn1helpers.h" |
| #include "iu_helpers.h" |
| |
| #include "hnbgw.h" |
| #include "hnbap_common.h" |
| #include "hnbap_ies_defs.h" |
| |
| #define IU_MSG_NUM_IES 32 |
| #define IU_MSG_NUM_EXT_IES 32 |
| |
| static int hnbgw_hnbap_tx(struct hnb_context *ctx, struct msgb *msg) |
| { |
| if (!msg) |
| return -EINVAL; |
| |
| msgb_ppid(msg) = IUH_PPI_HNBAP; |
| return osmo_wqueue_enqueue(&ctx->wqueue, msg); |
| } |
| |
| static int hnbgw_tx_hnb_register_acc(struct hnb_context *ctx) |
| { |
| HNBRegisterAccept_t accept_out; |
| struct msgb *msg; |
| int rc; |
| |
| /* Single required response IE: RNC-ID */ |
| HNBRegisterAcceptIEs_t accept = { |
| .rnc_id = ctx->gw->config.rnc_id |
| }; |
| |
| /* encode the Information Elements */ |
| memset(&accept_out, 0, sizeof(accept_out)); |
| rc = hnbap_encode_hnbregisteraccepties(&accept_out, &accept); |
| if (rc < 0) { |
| return rc; |
| } |
| |
| /* generate a successfull outcome PDU */ |
| msg = hnbap_generate_successful_outcome(ProcedureCode_id_HNBRegister, |
| Criticality_reject, |
| &asn_DEF_HNBRegisterAccept, |
| &accept_out); |
| |
| return hnbgw_hnbap_tx(ctx, msg); |
| } |
| |
| |
| static int hnbgw_tx_ue_register_acc(struct ue_context *ue) |
| { |
| UERegisterAccept_t accept_out; |
| UERegisterAcceptIEs_t accept; |
| struct msgb *msg; |
| uint8_t encoded_imsi[10]; |
| size_t encoded_imsi_len; |
| int rc; |
| |
| encoded_imsi_len = encode_iu_imsi(encoded_imsi, |
| sizeof(encoded_imsi), ue->imsi); |
| |
| memset(&accept, 0, sizeof(accept)); |
| accept.uE_Identity.present = UE_Identity_PR_iMSI; |
| OCTET_STRING_fromBuf(&accept.uE_Identity.choice.iMSI, |
| (const char *)encoded_imsi, encoded_imsi_len); |
| asn1_u32_to_bitstring(&accept.context_ID, &ue->context_id); |
| accept.context_ID.size = 3; /* 24bit field */ |
| |
| memset(&accept_out, 0, sizeof(accept_out)); |
| rc = hnbap_encode_ueregisteraccepties(&accept_out, &accept); |
| if (rc < 0) { |
| return rc; |
| } |
| |
| msg = hnbap_generate_successful_outcome(ProcedureCode_id_UERegister, |
| Criticality_reject, |
| &asn_DEF_UERegisterAccept, |
| &accept_out); |
| return hnbgw_hnbap_tx(ue->hnb, msg); |
| } |
| |
| static int hnbgw_rx_hnb_register_req(struct hnb_context *ctx, ANY_t *in) |
| { |
| HNBRegisterRequestIEs_t ies; |
| int rc; |
| |
| rc = hnbap_decode_hnbregisterrequesties(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| /* copy all identity parameters from the message to ctx */ |
| asn1_strncpy(ctx->identity_info, &ies.hnB_Identity.hNB_Identity_Info, |
| sizeof(ctx->identity_info)); |
| ctx->id.lac = asn1str_to_u16(&ies.lac); |
| ctx->id.sac = asn1str_to_u16(&ies.sac); |
| ctx->id.rac = asn1str_to_u8(&ies.rac); |
| ctx->id.cid = asn1bitstr_to_u32(&ies.cellIdentity); |
| //ctx->id.mcc FIXME |
| //ctx->id.mnc FIXME |
| |
| DEBUGP(DMAIN, "HNB-REGISTER-REQ from %s\n", ctx->identity_info); |
| |
| /* Send HNBRegisterAccept */ |
| return hnbgw_tx_hnb_register_acc(ctx); |
| } |
| |
| static int hnbgw_rx_ue_register_req(struct hnb_context *ctx, ANY_t *in) |
| { |
| UERegisterRequestIEs_t ies; |
| struct ue_context *ue; |
| char imsi[16]; |
| int rc; |
| |
| rc = hnbap_decode_ueregisterrequesties(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| switch (ies.uE_Identity.present) { |
| case UE_Identity_PR_iMSI: |
| decode_iu_bcd(imsi, sizeof(imsi), ies.uE_Identity.choice.iMSI.buf, |
| ies.uE_Identity.choice.iMSI.size); |
| break; |
| case UE_Identity_PR_iMSIDS41: |
| decode_iu_bcd(imsi, sizeof(imsi), ies.uE_Identity.choice.iMSIDS41.buf, |
| ies.uE_Identity.choice.iMSIDS41.size); |
| break; |
| case UE_Identity_PR_iMSIESN: |
| decode_iu_bcd(imsi, sizeof(imsi), ies.uE_Identity.choice.iMSIESN.iMSIDS41.buf, |
| ies.uE_Identity.choice.iMSIESN.iMSIDS41.size); |
| break; |
| default: |
| LOGP(DMAIN, LOGL_NOTICE, "UE-REGISTER-REQ without IMSI?!?\n"); |
| return -1; |
| } |
| |
| DEBUGP(DMAIN, "UE-REGSITER-REQ ID_type=%d imsi=%s cause=%ld\n", |
| ies.uE_Identity.present, imsi, ies.registration_Cause); |
| |
| ue = ue_context_by_imsi(imsi); |
| if (!ue) |
| ue = ue_context_alloc(ctx, imsi); |
| |
| /* Send UERegisterAccept */ |
| return hnbgw_tx_ue_register_acc(ue); |
| } |
| |
| static int hnbgw_rx_err_ind(struct hnb_context *hnb, ANY_t *in) |
| { |
| ErrorIndicationIEs_t ies; |
| int rc; |
| |
| rc = hnbap_decode_errorindicationies(&ies, in); |
| if (rc < 0) |
| return rc; |
| |
| LOGP(DMAIN, LOGL_NOTICE, "HNBAP ERROR.ind, cause: %s\n", |
| hnbap_cause_str(&ies.cause)); |
| |
| return 0; |
| } |
| |
| static int hnbgw_rx_initiating_msg(struct hnb_context *hnb, InitiatingMessage_t *imsg) |
| { |
| int rc; |
| |
| switch (imsg->procedureCode) { |
| case ProcedureCode_id_HNBRegister: /* 8.2 */ |
| rc = hnbgw_rx_hnb_register_req(hnb, &imsg->value); |
| break; |
| case ProcedureCode_id_HNBDe_Register: /* 8.3 */ |
| break; |
| case ProcedureCode_id_UERegister: /* 8.4 */ |
| rc = hnbgw_rx_ue_register_req(hnb, &imsg->value); |
| break; |
| case ProcedureCode_id_UEDe_Register: /* 8.5 */ |
| break; |
| case ProcedureCode_id_ErrorIndication: /* 8.6 */ |
| rc = hnbgw_rx_err_ind(hnb, &imsg->value); |
| break; |
| case ProcedureCode_id_TNLUpdate: /* 8.9 */ |
| case ProcedureCode_id_HNBConfigTransfer: /* 8.10 */ |
| case ProcedureCode_id_RelocationComplete: /* 8.11 */ |
| case ProcedureCode_id_U_RNTIQuery: /* 8.12 */ |
| case ProcedureCode_id_privateMessage: |
| LOGP(DMAIN, LOGL_NOTICE, "Unimplemented HNBAP Procedure %ld\n", |
| imsg->procedureCode); |
| break; |
| default: |
| LOGP(DMAIN, LOGL_NOTICE, "Unknown HNBAP Procedure %ld\n", |
| imsg->procedureCode); |
| break; |
| } |
| } |
| |
| static int hnbgw_rx_successful_outcome_msg(struct hnb_context *hnb, SuccessfulOutcome_t *msg) |
| { |
| |
| } |
| |
| static int hnbgw_rx_unsuccessful_outcome_msg(struct hnb_context *hnb, UnsuccessfulOutcome_t *msg) |
| { |
| |
| } |
| |
| |
| static int _hnbgw_hnbap_rx(struct hnb_context *hnb, HNBAP_PDU_t *pdu) |
| { |
| int rc; |
| |
| /* it's a bit odd that we can't dispatch on procedure code, but |
| * that's not possible */ |
| switch (pdu->present) { |
| case HNBAP_PDU_PR_initiatingMessage: |
| rc = hnbgw_rx_initiating_msg(hnb, &pdu->choice.initiatingMessage); |
| break; |
| case HNBAP_PDU_PR_successfulOutcome: |
| rc = hnbgw_rx_successful_outcome_msg(hnb, &pdu->choice.successfulOutcome); |
| break; |
| case HNBAP_PDU_PR_unsuccessfulOutcome: |
| rc = hnbgw_rx_unsuccessful_outcome_msg(hnb, &pdu->choice.unsuccessfulOutcome); |
| break; |
| default: |
| LOGP(DMAIN, LOGL_NOTICE, "Unknown HNBAP Presence %u\n", |
| pdu->present); |
| return -1; |
| } |
| } |
| |
| int hnbgw_hnbap_rx(struct hnb_context *hnb, struct msgb *msg) |
| { |
| HNBAP_PDU_t _pdu, *pdu = &_pdu; |
| asn_dec_rval_t dec_ret; |
| int rc; |
| |
| /* decode and handle to _hnbgw_hnbap_rx() */ |
| |
| memset(pdu, 0, sizeof(*pdu)); |
| dec_ret = aper_decode(NULL, &asn_DEF_HNBAP_PDU, (void **) &pdu, |
| msg->data, msgb_length(msg), 0, 0); |
| if (dec_ret.code != RC_OK) { |
| LOGP(DMAIN, LOGL_ERROR, "Error in ASN.1 decode\n"); |
| return rc; |
| } |
| |
| rc = _hnbgw_hnbap_rx(hnb, pdu); |
| |
| return rc; |
| } |
| |
| |
| int hnbgw_hnbap_init(void) |
| { |
| |
| } |