forked from acouzens/open5gs
612 lines
17 KiB
C
612 lines
17 KiB
C
/*
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* Copyright (C) 2019 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "ogs-sctp.h"
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#include "mme-event.h"
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#include "mme-timer.h"
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#include "nas-security.h"
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#include "nas-path.h"
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#include "s1ap-build.h"
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#include "s1ap-path.h"
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int s1ap_open(void)
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{
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ogs_socknode_t *node = NULL;
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ogs_list_for_each(&mme_self()->s1ap_list, node)
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if (s1ap_server(node) == NULL) return OGS_ERROR;
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ogs_list_for_each(&mme_self()->s1ap_list6, node)
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if (s1ap_server(node) == NULL) return OGS_ERROR;
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return OGS_OK;
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}
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void s1ap_close()
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{
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ogs_socknode_remove_all(&mme_self()->s1ap_list);
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ogs_socknode_remove_all(&mme_self()->s1ap_list6);
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}
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int s1ap_send_to_enb(mme_enb_t *enb, ogs_pkbuf_t *pkbuf, uint16_t stream_no)
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{
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char buf[OGS_ADDRSTRLEN];
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ogs_assert(enb);
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ogs_assert(pkbuf);
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ogs_assert(enb->sctp.sock);
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if (enb->sctp.sock->fd == INVALID_SOCKET) {
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ogs_fatal("eNB SCTP socket has already been destroyed");
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ogs_log_hexdump(OGS_LOG_FATAL, pkbuf->data, pkbuf->len);
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ogs_assert_if_reached();
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return OGS_ERROR;
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}
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ogs_debug(" IP[%s] ENB_ID[%d]",
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OGS_ADDR(enb->sctp.addr, buf), enb->enb_id);
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ogs_sctp_ppid_in_pkbuf(pkbuf) = OGS_SCTP_S1AP_PPID;
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ogs_sctp_stream_no_in_pkbuf(pkbuf) = stream_no;
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if (enb->sctp.type == SOCK_STREAM) {
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ogs_sctp_write_to_buffer(&enb->sctp, pkbuf);
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return OGS_OK;
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} else {
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return ogs_sctp_senddata(enb->sctp.sock, pkbuf, enb->sctp.addr);
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}
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}
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int s1ap_send_to_enb_ue(enb_ue_t *enb_ue, ogs_pkbuf_t *pkbuf)
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{
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mme_enb_t *enb = NULL;
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ogs_assert(enb_ue);
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enb = enb_ue->enb;
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ogs_assert(enb);
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return s1ap_send_to_enb(enb, pkbuf, enb_ue->enb_ostream_id);
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}
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int s1ap_delayed_send_to_enb_ue(
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enb_ue_t *enb_ue, ogs_pkbuf_t *pkbuf, ogs_time_t duration)
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{
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ogs_assert(enb_ue);
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ogs_assert(pkbuf);
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if (duration) {
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mme_event_t *e = NULL;
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e = mme_event_new(MME_EVT_S1AP_TIMER);
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ogs_assert(e);
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e->timer = ogs_timer_add(
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ogs_app()->timer_mgr, mme_timer_s1_delayed_send, e);
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ogs_assert(e->timer);
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e->pkbuf = pkbuf;
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e->enb_ue = enb_ue;
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e->enb = enb_ue->enb;
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ogs_timer_start(e->timer, duration);
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return OGS_OK;
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} else {
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mme_enb_t *enb = NULL;
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enb = enb_ue->enb;
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ogs_assert(enb);
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return s1ap_send_to_enb_ue(enb_ue, pkbuf);
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}
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}
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int s1ap_send_to_esm(
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mme_ue_t *mme_ue, ogs_pkbuf_t *esmbuf,
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uint8_t nas_type, bool esm_piggybacked)
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{
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int rv;
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mme_event_t *e = NULL;
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ogs_assert(mme_ue);
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ogs_assert(esmbuf);
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e = mme_event_new(MME_EVT_ESM_MESSAGE);
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ogs_assert(e);
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e->mme_ue = mme_ue;
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e->pkbuf = esmbuf;
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e->nas_type = nas_type;
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e->esm_piggybacked = esm_piggybacked;
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rv = ogs_queue_push(ogs_app()->queue, e);
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if (rv != OGS_OK) {
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ogs_warn("ogs_queue_push() failed:%d", (int)rv);
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ogs_pkbuf_free(e->pkbuf);
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mme_event_free(e);
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}
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return rv;
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}
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int s1ap_send_to_nas(enb_ue_t *enb_ue,
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S1AP_ProcedureCode_t procedureCode, S1AP_NAS_PDU_t *nasPdu)
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{
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ogs_nas_eps_security_header_t *sh = NULL;
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ogs_nas_security_header_type_t security_header_type;
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ogs_nas_emm_header_t *h = NULL;
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ogs_pkbuf_t *nasbuf = NULL;
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mme_event_t *e = NULL;
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ogs_assert(enb_ue);
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ogs_assert(nasPdu);
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/* The Packet Buffer(pkbuf_t) for NAS message MUST make a HEADROOM.
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* When calculating AES_CMAC, we need to use the headroom of the packet. */
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nasbuf = ogs_pkbuf_alloc(NULL, OGS_NAS_HEADROOM+nasPdu->size);
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ogs_assert(nasbuf);
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ogs_pkbuf_reserve(nasbuf, OGS_NAS_HEADROOM);
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ogs_pkbuf_put_data(nasbuf, nasPdu->buf, nasPdu->size);
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sh = (ogs_nas_eps_security_header_t *)nasbuf->data;
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ogs_assert(sh);
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memset(&security_header_type, 0, sizeof(ogs_nas_security_header_type_t));
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switch(sh->security_header_type) {
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case OGS_NAS_SECURITY_HEADER_PLAIN_NAS_MESSAGE:
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break;
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case OGS_NAS_SECURITY_HEADER_FOR_SERVICE_REQUEST_MESSAGE:
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security_header_type.service_request = 1;
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break;
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case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED:
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security_header_type.integrity_protected = 1;
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ogs_pkbuf_pull(nasbuf, 6);
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break;
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case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_CIPHERED:
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security_header_type.integrity_protected = 1;
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security_header_type.ciphered = 1;
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ogs_pkbuf_pull(nasbuf, 6);
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break;
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case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_NEW_SECURITY_CONTEXT:
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security_header_type.integrity_protected = 1;
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security_header_type.new_security_context = 1;
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ogs_pkbuf_pull(nasbuf, 6);
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break;
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case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_CIPHTERD_WITH_NEW_INTEGRITY_CONTEXT:
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security_header_type.integrity_protected = 1;
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security_header_type.ciphered = 1;
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security_header_type.new_security_context = 1;
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ogs_pkbuf_pull(nasbuf, 6);
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break;
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default:
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ogs_error("Not implemented(security header type:0x%x)",
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sh->security_header_type);
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return OGS_ERROR;
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}
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if (enb_ue->mme_ue) {
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if (nas_eps_security_decode(enb_ue->mme_ue,
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security_header_type, nasbuf) != OGS_OK) {
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ogs_error("nas_eps_security_decode failed()");
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return OGS_ERROR;
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}
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}
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h = (ogs_nas_emm_header_t *)nasbuf->data;
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ogs_assert(h);
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if (h->protocol_discriminator == OGS_NAS_PROTOCOL_DISCRIMINATOR_EMM) {
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int rv;
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e = mme_event_new(MME_EVT_EMM_MESSAGE);
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if (!e) {
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ogs_error("s1ap_send_to_nas() failed");
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ogs_pkbuf_free(nasbuf);
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return OGS_ERROR;
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}
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e->enb_ue = enb_ue;
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e->s1ap_code = procedureCode;
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e->nas_type = security_header_type.type;
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e->pkbuf = nasbuf;
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rv = ogs_queue_push(ogs_app()->queue, e);
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if (rv != OGS_OK) {
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ogs_warn("s1ap_send_to_nas() failed:%d", (int)rv);
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ogs_pkbuf_free(e->pkbuf);
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mme_event_free(e);
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}
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return rv;
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} else if (h->protocol_discriminator ==
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OGS_NAS_PROTOCOL_DISCRIMINATOR_ESM) {
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mme_ue_t *mme_ue = enb_ue->mme_ue;
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if (!mme_ue) {
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ogs_error("No UE Context");
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ogs_pkbuf_free(nasbuf);
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return OGS_ERROR;
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}
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return s1ap_send_to_esm(
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mme_ue, nasbuf, security_header_type.type, false);
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} else {
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ogs_error("Unknown/Unimplemented NAS Protocol discriminator 0x%02x",
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h->protocol_discriminator);
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ogs_pkbuf_free(nasbuf);
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return OGS_ERROR;
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}
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}
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int s1ap_send_s1_setup_response(mme_enb_t *enb)
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{
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int rv;
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ogs_pkbuf_t *s1ap_buffer;
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ogs_debug("S1-Setup response");
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s1ap_buffer = s1ap_build_setup_rsp();
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ogs_expect_or_return_val(s1ap_buffer, OGS_ERROR);
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rv = s1ap_send_to_enb(enb, s1ap_buffer, S1AP_NON_UE_SIGNALLING);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_s1_setup_failure(
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mme_enb_t *enb, S1AP_Cause_PR group, long cause)
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{
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int rv;
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ogs_pkbuf_t *s1ap_buffer;
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ogs_debug("S1-Setup failure");
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s1ap_buffer = s1ap_build_setup_failure(group, cause, S1AP_TimeToWait_v10s);
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ogs_expect_or_return_val(s1ap_buffer, OGS_ERROR);
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rv = s1ap_send_to_enb(enb, s1ap_buffer, S1AP_NON_UE_SIGNALLING);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_initial_context_setup_request(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("InitialContextSetupRequest");
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s1apbuf = s1ap_build_initial_context_setup_request(mme_ue, NULL);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_ue_context_modification_request(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("UEContextModificationRequest");
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s1apbuf = s1ap_build_ue_context_modification_request(mme_ue);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_ue_context_release_command(
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enb_ue_t *enb_ue, S1AP_Cause_PR group, long cause,
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uint8_t action, ogs_time_t duration)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(enb_ue);
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ogs_debug("UEContextReleaseCommand");
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ogs_debug(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
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enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
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ogs_assert(action != S1AP_UE_CTX_REL_INVALID_ACTION);
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enb_ue->ue_ctx_rel_action = action;
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ogs_debug(" Group[%d] Cause[%d] Action[%d] Duration[%d]",
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group, (int)cause, action, (int)duration);
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s1apbuf = s1ap_build_ue_context_release_command(enb_ue, group, cause);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = s1ap_delayed_send_to_enb_ue(enb_ue, s1apbuf, duration);
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ogs_expect(rv == OGS_OK);
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ogs_timer_start(enb_ue->t_s1_holding,
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mme_timer_cfg(MME_TIMER_S1_HOLDING)->duration);
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return rv;
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}
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int s1ap_send_paging(mme_ue_t *mme_ue, S1AP_CNDomain_t cn_domain)
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{
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ogs_pkbuf_t *s1apbuf = NULL;
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mme_enb_t *enb = NULL;
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int i;
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int rv;
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/* Find enB with matched TAI */
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ogs_list_for_each(&mme_self()->enb_list, enb) {
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for (i = 0; i < enb->num_of_supported_ta_list; i++) {
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if (memcmp(&enb->supported_ta_list[i], &mme_ue->tai,
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sizeof(ogs_eps_tai_t)) == 0) {
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if (mme_ue->t3413.pkbuf) {
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s1apbuf = mme_ue->t3413.pkbuf;
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} else {
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s1apbuf = s1ap_build_paging(mme_ue, cn_domain);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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}
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mme_ue->t3413.pkbuf = ogs_pkbuf_copy(s1apbuf);
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ogs_expect_or_return_val(mme_ue->t3413.pkbuf, OGS_ERROR);
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rv = s1ap_send_to_enb(enb, s1apbuf, S1AP_NON_UE_SIGNALLING);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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}
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}
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}
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/* Start T3413 */
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ogs_timer_start(mme_ue->t3413.timer,
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mme_timer_cfg(MME_TIMER_T3413)->duration);
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return OGS_OK;
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}
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int s1ap_send_mme_configuration_transfer(
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mme_enb_t *target_enb,
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S1AP_SONConfigurationTransfer_t *SONConfigurationTransfer)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(target_enb);
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ogs_assert(SONConfigurationTransfer);
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ogs_debug("MMEConfigurationTransfer");
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s1apbuf = s1ap_build_mme_configuration_transfer(SONConfigurationTransfer);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = s1ap_send_to_enb(target_enb, s1apbuf, S1AP_NON_UE_SIGNALLING);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_e_rab_modification_confirm(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("E-RABModificationConfirm");
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s1apbuf = s1ap_build_e_rab_modification_confirm(mme_ue);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_path_switch_ack(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("PathSwitchAcknowledge");
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s1apbuf = s1ap_build_path_switch_ack(mme_ue);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_handover_command(enb_ue_t *source_ue)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(source_ue);
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ogs_debug("HandoverCommand");
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s1apbuf = s1ap_build_handover_command(source_ue);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = s1ap_send_to_enb_ue(source_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int s1ap_send_handover_preparation_failure(
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enb_ue_t *source_ue, S1AP_Cause_PR group, long cause)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_assert(source_ue);
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ogs_assert(group);
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ogs_debug("HandoverPreparationFailure");
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s1apbuf = s1ap_build_handover_preparation_failure(source_ue, group, cause);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = s1ap_send_to_enb_ue(source_ue, s1apbuf);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int s1ap_send_handover_cancel_ack(enb_ue_t *source_ue)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
|
|
ogs_assert(source_ue);
|
|
|
|
ogs_debug("HandoverCancelAcknowledge");
|
|
s1apbuf = s1ap_build_handover_cancel_ack(source_ue);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = s1ap_send_to_enb_ue(source_ue, s1apbuf);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
|
|
int s1ap_send_handover_request(
|
|
enb_ue_t *source_ue, mme_enb_t *target_enb,
|
|
S1AP_HandoverType_t *handovertype, S1AP_Cause_t *cause,
|
|
S1AP_Source_ToTarget_TransparentContainer_t
|
|
*source_totarget_transparentContainer)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
|
|
enb_ue_t *target_ue = NULL;
|
|
|
|
ogs_info("HandoverRequest");
|
|
ogs_assert(source_ue);
|
|
ogs_assert(source_ue->target_ue == NULL);
|
|
ogs_assert(target_enb);
|
|
|
|
target_ue = enb_ue_add(target_enb, INVALID_UE_S1AP_ID);
|
|
ogs_assert(target_ue);
|
|
|
|
ogs_info(" Source : ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
|
|
source_ue->enb_ue_s1ap_id, source_ue->mme_ue_s1ap_id);
|
|
ogs_info(" Target : ENB_UE_S1AP_ID[Unknown] MME_UE_S1AP_ID[%d]",
|
|
target_ue->mme_ue_s1ap_id);
|
|
|
|
source_ue_associate_target_ue(source_ue, target_ue);
|
|
|
|
s1apbuf = s1ap_build_handover_request(
|
|
target_ue, handovertype, cause,
|
|
source_totarget_transparentContainer);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = s1ap_send_to_enb_ue(target_ue, s1apbuf);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int s1ap_send_mme_status_transfer(
|
|
enb_ue_t *target_ue,
|
|
S1AP_ENB_StatusTransfer_TransparentContainer_t
|
|
*enb_statustransfer_transparentContainer)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
|
|
ogs_assert(target_ue);
|
|
|
|
ogs_info("MMEStatusTransfer");
|
|
s1apbuf = s1ap_build_mme_status_transfer(target_ue,
|
|
enb_statustransfer_transparentContainer);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = s1ap_send_to_enb_ue(target_ue, s1apbuf);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int s1ap_send_error_indication(
|
|
mme_enb_t *enb,
|
|
S1AP_MME_UE_S1AP_ID_t *mme_ue_s1ap_id,
|
|
S1AP_ENB_UE_S1AP_ID_t *enb_ue_s1ap_id,
|
|
S1AP_Cause_PR group, long cause)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
|
|
ogs_assert(enb);
|
|
|
|
ogs_info("ErrorIndication");
|
|
s1apbuf = ogs_s1ap_build_error_indication(
|
|
mme_ue_s1ap_id, enb_ue_s1ap_id, group, cause);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = s1ap_send_to_enb(enb, s1apbuf, S1AP_NON_UE_SIGNALLING);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int s1ap_send_error_indication2(
|
|
mme_ue_t *mme_ue, S1AP_Cause_PR group, long cause)
|
|
{
|
|
int rv;
|
|
mme_enb_t *enb;
|
|
enb_ue_t *enb_ue;
|
|
|
|
S1AP_MME_UE_S1AP_ID_t mme_ue_s1ap_id;
|
|
S1AP_ENB_UE_S1AP_ID_t enb_ue_s1ap_id;
|
|
|
|
ogs_assert(mme_ue);
|
|
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
|
|
ogs_expect_or_return_val(enb_ue, OGS_ERROR);
|
|
enb = enb_ue->enb;
|
|
ogs_expect_or_return_val(enb, OGS_ERROR);
|
|
|
|
mme_ue_s1ap_id = enb_ue->mme_ue_s1ap_id,
|
|
enb_ue_s1ap_id = enb_ue->enb_ue_s1ap_id,
|
|
|
|
rv = s1ap_send_error_indication(
|
|
enb, &mme_ue_s1ap_id, &enb_ue_s1ap_id, group, cause);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int s1ap_send_s1_reset_ack(
|
|
mme_enb_t *enb,
|
|
S1AP_UE_associatedLogicalS1_ConnectionListRes_t *partOfS1_Interface)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
|
|
ogs_assert(enb);
|
|
|
|
ogs_info("S1-Reset Acknowledge");
|
|
s1apbuf = ogs_s1ap_build_s1_reset_ack(partOfS1_Interface);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = s1ap_send_to_enb(enb, s1apbuf, S1AP_NON_UE_SIGNALLING);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|