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open5gs/src/mme/mme-gtp-path.c

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/*
* Copyright (C) 2019-2024 by Sukchan Lee <acetcom@gmail.com>
*
* This file is part of Open5GS.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "ogs-gtp.h"
#include "mme-event.h"
#include "mme-gn-build.h"
#include "mme-gtp-path.h"
#include "mme-path.h"
#include "s1ap-path.h"
#include "mme-s11-build.h"
#include "mme-sm.h"
static void _gtpv1v2_c_recv_cb(short when, ogs_socket_t fd, void *data)
{
int rv;
char buf[OGS_ADDRSTRLEN];
ssize_t size;
mme_event_t *e = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_sockaddr_t from;
mme_sgw_t *sgw = NULL;
mme_sgsn_t *sgsn = NULL;
uint8_t gtp_ver;
ogs_assert(fd != INVALID_SOCKET);
pkbuf = ogs_pkbuf_alloc(NULL, OGS_MAX_SDU_LEN);
ogs_assert(pkbuf);
ogs_pkbuf_put(pkbuf, OGS_MAX_SDU_LEN);
size = ogs_recvfrom(fd, pkbuf->data, pkbuf->len, 0, &from);
if (size <= 0) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_recvfrom() failed");
ogs_pkbuf_free(pkbuf);
return;
}
ogs_pkbuf_trim(pkbuf, size);
gtp_ver = ((ogs_gtp2_header_t *)pkbuf->data)->version;
switch (gtp_ver) {
case 1:
sgsn = mme_sgsn_find_by_addr(&from);
if (!sgsn) {
ogs_error("Unknown SGSN : %s", OGS_ADDR(&from, buf));
ogs_pkbuf_free(pkbuf);
return;
}
ogs_assert(sgsn);
e = mme_event_new(MME_EVENT_GN_MESSAGE);
ogs_assert(e);
e->gnode = &sgsn->gnode;
break;
case 2:
sgw = mme_sgw_find_by_addr(&from);
if (!sgw) {
ogs_error("Unknown SGW : %s", OGS_ADDR(&from, buf));
ogs_pkbuf_free(pkbuf);
return;
}
ogs_assert(sgw);
e = mme_event_new(MME_EVENT_S11_MESSAGE);
ogs_assert(e);
e->gnode = &sgw->gnode;
break;
default:
ogs_warn("Rx unexpected GTP version %u", gtp_ver);
ogs_pkbuf_free(pkbuf);
return;
}
e->pkbuf = pkbuf;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ogs_queue_push() failed:%d", (int)rv);
ogs_pkbuf_free(e->pkbuf);
mme_event_free(e);
}
}
static void timeout(ogs_gtp_xact_t *xact, void *data)
{
int r;
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
uint8_t type = 0;
ogs_assert(xact);
type = xact->seq[0].type;
switch (type) {
case OGS_GTP2_MODIFY_BEARER_REQUEST_TYPE:
case OGS_GTP2_RELEASE_ACCESS_BEARERS_REQUEST_TYPE:
case OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
case OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE:
mme_ue = data;
ogs_assert(mme_ue);
break;
case OGS_GTP2_CREATE_SESSION_REQUEST_TYPE:
case OGS_GTP2_DELETE_SESSION_REQUEST_TYPE:
sess = data;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
break;
case OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE:
bearer = data;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
break;
default:
ogs_fatal("Invalid type [%d]", type);
ogs_assert_if_reached();
break;
}
ogs_assert(mme_ue);
switch (type) {
case OGS_GTP2_DELETE_SESSION_REQUEST_TYPE:
/*
* If SESSION_CONTEXT_WILL_DELETED(MME_UE) is not cleared,
* The MME cannot send Delete-Session-Request to the SGW-C.
* As such, it could be the infinite loop occurred in EMM state machine.
*
* To prevent this situation,
* force clearing SESSION_CONTEXT_WILL_DELETED variable
* when MME does not receive Delete-Session-Response message from SGW-C.
*/
CLEAR_SESSION_CONTEXT(mme_ue);
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
if (enb_ue) {
r = s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_warn("No S1 Context");
}
break;
case OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE:
/* Nothing to do */
break;
default:
mme_send_delete_session_or_mme_ue_context_release(mme_ue);
break;
}
ogs_error("GTP Timeout : IMSI[%s] Message-Type[%d]",
mme_ue->imsi_bcd, type);
}
int mme_gtp_open(void)
{
int rv;
ogs_socknode_t *node = NULL;
ogs_sock_t *sock = NULL;
mme_sgw_t *sgw = NULL;
mme_sgsn_t *sgsn = NULL;
ogs_list_for_each(&ogs_gtp_self()->gtpc_list, node) {
sock = ogs_gtp_server(node);
if (!sock) return OGS_ERROR;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, _gtpv1v2_c_recv_cb, sock);
ogs_assert(node->poll);
}
ogs_list_for_each(&ogs_gtp_self()->gtpc_list6, node) {
sock = ogs_gtp_server(node);
if (!sock) return OGS_ERROR;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, _gtpv1v2_c_recv_cb, sock);
ogs_assert(node->poll);
}
OGS_SETUP_GTPC_SERVER;
mme_self()->pgw_addr = mme_pgw_addr_find_by_apn_enb(
&mme_self()->pgw_list, AF_INET, NULL);
mme_self()->pgw_addr6 = mme_pgw_addr_find_by_apn_enb(
&mme_self()->pgw_list, AF_INET6, NULL);
ogs_assert(mme_self()->pgw_addr || mme_self()->pgw_addr6);
ogs_list_for_each(&mme_self()->sgw_list, sgw) {
rv = ogs_gtp_connect(
ogs_gtp_self()->gtpc_sock, ogs_gtp_self()->gtpc_sock6,
&sgw->gnode);
ogs_assert(rv == OGS_OK);
}
ogs_list_for_each(&mme_self()->sgsn_list, sgsn) {
rv = ogs_gtp_connect(
ogs_gtp_self()->gtpc_sock, ogs_gtp_self()->gtpc_sock6,
&sgsn->gnode);
ogs_assert(rv == OGS_OK);
}
return OGS_OK;
}
void mme_gtp_close(void)
{
ogs_socknode_remove_all(&ogs_gtp_self()->gtpc_list);
ogs_socknode_remove_all(&ogs_gtp_self()->gtpc_list6);
}
int mme_gtp_send_create_session_request(mme_sess_t *sess, int create_action)
{
int rv;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
sgw_ue = sgw_ue_cycle(mme_ue->sgw_ue);
ogs_assert(sgw_ue);
if (create_action == OGS_GTP_CREATE_IN_PATH_SWITCH_REQUEST) {
sgw_ue = sgw_ue_cycle(sgw_ue->target_ue);
ogs_assert(sgw_ue);
}
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_SESSION_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_session_request(h.type, sess, create_action);
if (!pkbuf) {
ogs_error("mme_s11_build_create_session_request() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, sess);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->create_action = create_action;
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_modify_bearer_request(
mme_ue_t *mme_ue, int uli_presence, int modify_action)
{
int rv;
ogs_gtp_xact_t *xact = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_MODIFY_BEARER_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_modify_bearer_request(h.type, mme_ue, uli_presence);
if (!pkbuf) {
ogs_error("mme_s11_build_modify_bearer_request() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, mme_ue);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->modify_action = modify_action;
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_delete_session_request(
sgw_ue_t *sgw_ue, mme_sess_t *sess, int action)
{
int rv;
ogs_pkbuf_t *s11buf = NULL;
ogs_gtp2_header_t h;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
ogs_assert(action);
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_SESSION_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
s11buf = mme_s11_build_delete_session_request(h.type, sess, action);
if (!s11buf) {
ogs_error("mme_s11_build_delete_session_request() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, s11buf, timeout, sess);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->delete_action = action;
xact->local_teid = mme_ue->gn.mme_gn_teid;
ogs_debug("delete_session_request - xact:%p, sess:%p", xact, sess);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
void mme_gtp_send_delete_all_sessions(mme_ue_t *mme_ue, int action)
{
mme_sess_t *sess = NULL, *next_sess = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
ogs_assert(action);
MME_UE_CHECK(OGS_LOG_DEBUG, mme_ue);
ogs_list_for_each_safe(&mme_ue->sess_list, next_sess, sess) {
if (MME_HAVE_SGW_S1U_PATH(sess)) {
mme_gtp_send_delete_session_request(sgw_ue, sess, action);
} else {
MME_SESS_CLEAR(sess);
}
}
}
int mme_gtp_send_create_bearer_response(
mme_bearer_t *bearer, uint8_t cause_value)
{
int rv;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
xact = ogs_gtp_xact_cycle(bearer->create.xact);
if (!xact) {
ogs_warn("GTP transaction(CREATE) has already been removed");
return OGS_OK;
}
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_BEARER_RESPONSE_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_bearer_response(h.type, bearer, cause_value);
if (!pkbuf) {
ogs_error("mme_s11_build_create_bearer_response() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_update_bearer_response(
mme_bearer_t *bearer, uint8_t cause_value)
{
int rv;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
xact = ogs_gtp_xact_cycle(bearer->update.xact);
if (!xact) {
ogs_warn("GTP transaction(UPDATE) has already been removed");
return OGS_OK;
}
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_UPDATE_BEARER_RESPONSE_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_update_bearer_response(h.type, bearer, cause_value);
if (!pkbuf) {
ogs_error("mme_s11_build_update_bearer_response() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_delete_bearer_response(
mme_bearer_t *bearer, uint8_t cause_value)
{
int rv;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
xact = ogs_gtp_xact_cycle(bearer->delete.xact);
if (!xact) {
ogs_warn("GTP transaction(DELETE) has already been removed");
return OGS_OK;
}
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_delete_bearer_response(h.type, bearer, cause_value);
if (!pkbuf) {
ogs_error("mme_s11_build_delete_bearer_response() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_release_access_bearers_request(mme_ue_t *mme_ue, int action)
{
int rv;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_assert(action);
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_RELEASE_ACCESS_BEARERS_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_release_access_bearers_request(h.type);
if (!pkbuf) {
ogs_error("mme_s11_build_release_access_bearers_request() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, mme_ue);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->release_action = action;
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
void mme_gtp_send_release_all_ue_in_enb(mme_enb_t *enb, int action)
{
mme_ue_t *mme_ue = NULL;
enb_ue_t *enb_ue = NULL, *next = NULL;
ogs_list_for_each_safe(&enb->enb_ue_list, next, enb_ue) {
mme_ue = enb_ue->mme_ue;
if (mme_ue) {
if (action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_LO_CONNREFUSED) {
/*
* https://github.com/open5gs/open5gs/pull/1497
*
* 1. eNB, SGW-U and UPF go offline at the same time.
* 2. MME sends Release Access Bearer Request to SGW-C
* 3. SGW-C/SMF sends PFCP modification,
* but SGW-U/UPF does not respond.
* 4. MME does not receive Release Access Bearer Response.
* 5. timeout()
* 6. MME sends Delete Session Request to the SGW-C/SMF
* 7. No SGW-U/UPF, so timeout()
* 8. MME sends UEContextReleaseRequest enb_ue.
* 9. But there is no enb_ue, so MME crashed.
*
* To solve this situation,
* Execute enb_ue_unlink(mme_ue) and enb_ue_remove(enb_ue)
* before mme_gtp_send_release_access_bearers_request()
*/
enb_ue_unlink(mme_ue);
enb_ue_remove(enb_ue);
}
ogs_assert(OGS_OK ==
mme_gtp_send_release_access_bearers_request(mme_ue, action));
} else {
ogs_warn("mme_gtp_send_release_all_ue_in_enb()");
ogs_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d] Action[%d]",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id, action);
if (action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_LO_CONNREFUSED ||
action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_RESET_ALL) {
enb_ue_remove(enb_ue);
} else {
/* At this point, it does not support other action */
ogs_assert_if_reached();
}
}
}
}
int mme_gtp_send_downlink_data_notification_ack(
mme_bearer_t *bearer, uint8_t cause_value)
{
int rv;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_gtp_xact_t *xact = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *s11buf = NULL;
ogs_assert(bearer);
xact = ogs_gtp_xact_cycle(bearer->notify.xact);
if (!xact) {
ogs_warn("GTP transaction(NOTIFY) has already been removed");
return OGS_OK;
}
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
/* Build Downlink data notification ack */
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
s11buf = mme_s11_build_downlink_data_notification_ack(h.type, cause_value);
if (!s11buf) {
ogs_error("mme_s11_build_downlink_data_notification_ack() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_update_tx(xact, &h, s11buf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_create_indirect_data_forwarding_tunnel_request(
mme_ue_t *mme_ue)
{
int rv;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_indirect_data_forwarding_tunnel_request(
h.type, mme_ue);
if (!pkbuf) {
ogs_error("mme_s11_build_create_indirect_data_forwarding_"
"tunnel_request() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, mme_ue);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_delete_indirect_data_forwarding_tunnel_request(
mme_ue_t *mme_ue, int action)
{
int rv;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_assert(action);
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = ogs_pkbuf_alloc(NULL, OGS_TLV_MAX_HEADROOM);
if (!pkbuf) {
ogs_error("ogs_pkbuf_alloc() failed");
return OGS_ERROR;
}
ogs_pkbuf_reserve(pkbuf, OGS_TLV_MAX_HEADROOM);
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, mme_ue);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->delete_indirect_action = action;
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_bearer_resource_command(
mme_bearer_t *bearer, ogs_nas_eps_message_t *nas_message)
{
int rv;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
sgw_ue_t *sgw_ue = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
sgw_ue = mme_ue->sgw_ue;
ogs_assert(sgw_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE;
h.teid_presence = OGS_GTP2_TEID_PRESENCE;
h.teid = sgw_ue->sgw_s11_teid;
pkbuf = mme_s11_build_bearer_resource_command(h.type, bearer, nas_message);
if (!pkbuf) {
ogs_error("mme_s11_build_bearer_resource_command() failed");
return OGS_ERROR;
}
xact = ogs_gtp_xact_local_create(sgw_ue->gnode, &h, pkbuf, timeout, bearer);
if (!xact) {
ogs_error("ogs_gtp_xact_local_create() failed");
return OGS_ERROR;
}
xact->xid |= OGS_GTP_CMD_XACT_ID;
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
/*************************
* GTPv1C (Gn interface):
*************************/
int mme_gtp1_send_sgsn_context_request(
mme_sgsn_t *sgsn, mme_ue_t *mme_ue)
{
int rv;
ogs_gtp1_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(sgsn);
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_SGSN_CONTEXT_REQUEST_TYPE;
h.teid = 0;
pkbuf = mme_gn_build_sgsn_context_request(mme_ue);
if (!pkbuf) {
ogs_error("mme_gn_build_ran_information_relay() failed");
return OGS_ERROR;
}
xact = ogs_gtp1_xact_local_create(&sgsn->gnode, &h, pkbuf, NULL, NULL);
if (!xact) {
ogs_error("ogs_gtp1_xact_local_create() failed");
return OGS_ERROR;
}
/* TS 29.060 8.2: "The SGSN Context Request message, where the Tunnel
* Endpoint Identifier shall be set to all zeroes." */
xact->local_teid = 0;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp1_send_sgsn_context_response(
mme_ue_t *mme_ue, uint8_t cause, ogs_gtp_xact_t *xact)
{
int rv;
ogs_gtp1_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_SGSN_CONTEXT_RESPONSE_TYPE;
h.teid = mme_ue ? mme_ue->gn.sgsn_gn_teid : 0;
pkbuf = mme_gn_build_sgsn_context_response(mme_ue, cause);
if (!pkbuf) {
ogs_error("mme_gn_build_sgsn_context_response() failed");
return OGS_ERROR;
}
xact->local_teid = mme_ue ? mme_ue->gn.mme_gn_teid : 0;
rv = ogs_gtp1_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp1_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp1_send_sgsn_context_ack(
mme_ue_t *mme_ue, uint8_t cause, ogs_gtp_xact_t *xact)
{
int rv;
ogs_gtp1_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_SGSN_CONTEXT_ACKNOWLEDGE_TYPE;
h.teid = mme_ue->gn.sgsn_gn_teid;
pkbuf = mme_gn_build_sgsn_context_ack(mme_ue, cause);
if (!pkbuf) {
ogs_error("mme_gn_build_sgsn_context_response() failed");
return OGS_ERROR;
}
xact->local_teid = mme_ue->gn.mme_gn_teid;
rv = ogs_gtp1_xact_update_tx(xact, &h, pkbuf);
if (rv != OGS_OK) {
ogs_error("ogs_gtp1_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp1_send_ran_information_relay(
mme_sgsn_t *sgsn, const uint8_t *buf, size_t len,
const ogs_nas_rai_t *rai, uint16_t cell_id)
{
int rv;
ogs_gtp1_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_gtp_xact_t *xact = NULL;
ogs_assert(sgsn);
ogs_assert(buf);
memset(&h, 0, sizeof(ogs_gtp1_header_t));
h.type = OGS_GTP1_RAN_INFORMATION_RELAY_TYPE;
h.teid = 0;
pkbuf = mme_gn_build_ran_information_relay(h.type, buf, len, rai, cell_id);
if (!pkbuf) {
ogs_error("mme_gn_build_ran_information_relay() failed");
return OGS_ERROR;
}
xact = ogs_gtp1_xact_local_create(&sgsn->gnode, &h, pkbuf, NULL, NULL);
if (!xact) {
ogs_error("ogs_gtp1_xact_local_create() failed");
return OGS_ERROR;
}
/* TS 29.060 8.2: "The RAN Information Relay message, where the Tunnel
* Endpoint Identifier shall be set to all zeroes." */
xact->local_teid = 0;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
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