forked from acouzens/open5gs
145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
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* Copyright (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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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 "mme-event.h"
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#include "mme-sm.h"
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#include "mme-context.h"
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#include "mme-timer.h"
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#include "mme-gtp-path.h"
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#include "mme-fd-path.h"
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#include "mme-path.h"
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#include "mme-gn-build.h"
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#include "mme-gn-handler.h"
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#include "s1ap-path.h"
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void mme_gn_handle_echo_request(
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ogs_gtp_xact_t *xact, ogs_gtp1_echo_request_t *req)
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{
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ogs_assert(xact);
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ogs_assert(req);
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ogs_debug("[Gn] Receiving Echo Request");
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/* FIXME : Implementing recovery counter correctly */
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ogs_gtp1_send_echo_response(xact, 0);
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}
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void mme_gn_handle_echo_response(
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ogs_gtp_xact_t *xact, ogs_gtp1_echo_response_t *req)
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{
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/* Not Implemented */
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}
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static int decode_global_enb_id(S1AP_Global_ENB_ID_t *glob_enb_id, const uint8_t *buf, size_t buf_len)
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{
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asn_dec_rval_t dec_ret = {0};
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memset(glob_enb_id, 0, sizeof(S1AP_Global_ENB_ID_t));
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dec_ret = aper_decode(NULL, &asn_DEF_S1AP_Global_ENB_ID, (void **)&glob_enb_id,
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buf, buf_len, 0, 0);
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if (dec_ret.code != RC_OK) {
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ogs_warn("Failed to decode ASN-PDU [code:%d,consumed:%d]",
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dec_ret.code, (int)dec_ret.consumed);
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return OGS_ERROR;
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}
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if (ogs_log_get_domain_level(OGS_LOG_DOMAIN) >= OGS_LOG_TRACE)
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asn_fprint(stdout, &asn_DEF_S1AP_Global_ENB_ID, glob_enb_id);
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return OGS_OK;
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}
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/* TS 29.060 7.5.14.1 */
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void mme_gn_handle_ran_information_relay(
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ogs_gtp_xact_t *xact, ogs_gtp1_ran_information_relay_t *req)
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{
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uint8_t discr;
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ogs_eps_tai_t *target_tai;
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S1AP_Global_ENB_ID_t global_ENB_ID;
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uint32_t target_enb_id;
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mme_enb_t *target_enb = NULL;
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int rv;
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ogs_debug("[Gn] Receiving RAN Information Relay");
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if (req->ran_transparent_container.len == 0 ||
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req->ran_transparent_container.data == NULL) {
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ogs_warn("[Gn] Receiving RAN Information Relay with empty container!");
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return;
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}
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/* "If RIM Routing Address Discriminator IE is not included, the RIM Routing
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* Address shall be processed as an RNC identifier". Hence, not for us! */
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if (req->rim_routing_address_discriminator.presence == false) {
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ogs_warn("[Gn] Rx RAN Information Relay: no RIM Routing Address Discriminator!");
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return;
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}
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if (req->rim_routing_address_discriminator.len != 1) {
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ogs_warn("[Gn] Rx RAN Information Relay: RIM Routing Address Discriminator len != 1");
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return;
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}
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/* 3GPP TS 48.018 RIM Routing Information IE */
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discr = *((uint8_t*)req->rim_routing_address_discriminator.data) & 0x0f;
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if (discr != 2) {/* 2: An eNB identifier is used to identify an E-UTRAN eNodeB or HeNB */
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ogs_warn("[Gn] Rx RAN Information Relay: RIM Routing Address Discriminator %u unexpected", discr);
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return;
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}
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if (req->rim_routing_address.presence == false) {
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ogs_warn("[Gn] Rx RAN Information Relay: no RIM Routing Address!");
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return;
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}
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if (req->rim_routing_address.len < sizeof(ogs_eps_tai_t)) {
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ogs_warn("[Gn] Rx RAN Information Relay: RIM Routing Address len < %zu", sizeof(ogs_eps_tai_t));
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return;
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}
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target_tai = req->rim_routing_address.data;
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rv = decode_global_enb_id(&global_ENB_ID,
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((uint8_t *)req->rim_routing_address.data) + sizeof(ogs_eps_tai_t),
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req->rim_routing_address.len - sizeof(ogs_eps_tai_t));
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if (rv != OGS_OK)
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return;
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ogs_s1ap_ENB_ID_to_uint32(&global_ENB_ID.eNB_ID, &target_enb_id);
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ogs_debug(" Target : ENB_ID[%s:%d], TAC[%d]",
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global_ENB_ID.eNB_ID.present ==
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S1AP_ENB_ID_PR_homeENB_ID ? "Home" :
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global_ENB_ID.eNB_ID.present ==
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S1AP_ENB_ID_PR_macroENB_ID ? "Macro" : "Others",
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target_enb_id, target_tai->tac);
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target_enb = mme_enb_find_by_enb_id(target_enb_id);
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if (target_enb == NULL) {
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ogs_warn("[Gn] Rx RAN Information Relay: cannot find target eNB-id[0x%x]", target_enb_id);
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return;
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}
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s1ap_send_mme_direct_information_transfer(
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target_enb,
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req->ran_transparent_container.data,
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req->ran_transparent_container.len);
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}
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