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

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/*
* Copyright (C) 2019 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-gtp-path.h"
#include "mme-path.h"
#include "s1ap-path.h"
#include "mme-s11-build.h"
#include "mme-sm.h"
static void _gtpv2_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;
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);
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_EVT_S11_MESSAGE);
ogs_assert(e);
e->gnode = (ogs_gtp_node_t *)sgw;
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)
{
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_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_MODIFY_BEARER_REQUEST_TYPE:
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) {
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
} 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;
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, _gtpv2_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, _gtpv2_c_recv_cb, sock);
ogs_assert(node->poll);
}
OGS_SETUP_GTPC_SERVER;
mme_self()->pgw_addr = mme_pgw_addr_find_by_apn(
&mme_self()->pgw_list, AF_INET, NULL);
mme_self()->pgw_addr6 = mme_pgw_addr_find_by_apn(
&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,
(ogs_gtp_node_t *)sgw);
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;
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_SESSION_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_session_request(h.type, sess);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, sess);
ogs_expect_or_return_val(xact, OGS_ERROR);
xact->create_action = create_action;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_modify_bearer_request(mme_bearer_t *bearer, int uli_presence)
{
int rv;
ogs_gtp_xact_t *xact = NULL;
mme_ue_t *mme_ue = NULL;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_MODIFY_BEARER_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_modify_bearer_request(h.type, bearer, uli_presence);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, bearer);
ogs_expect_or_return_val(xact, OGS_ERROR);
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int mme_gtp_send_delete_session_request(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);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_SESSION_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
s11buf = mme_s11_build_delete_session_request(h.type, sess);
ogs_expect_or_return_val(s11buf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, s11buf, timeout, sess);
ogs_expect_or_return_val(xact, OGS_ERROR);
xact->delete_action = action;
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;
ogs_assert(mme_ue);
ogs_assert(action);
if (SESSION_CONTEXT_WILL_DELETED(mme_ue)) {
ogs_warn("[%s] Delete-Session-Request has already sent",
mme_ue->imsi_bcd);
return;
}
mme_ue->session_context_will_deleted = 1;
sess = mme_sess_first(mme_ue);
while (sess != NULL) {
next_sess = mme_sess_next(sess);
if (MME_HAVE_SGW_S1U_PATH(sess)) {
mme_bearer_t *bearer = mme_default_bearer_in_sess(sess);
ogs_assert(bearer);
if (bearer &&
OGS_FSM_CHECK(&bearer->sm, esm_state_pdn_will_disconnect)) {
ogs_warn("PDN will disconnect[EBI:%d]", bearer->ebi);
} else {
mme_gtp_send_delete_session_request(sess, action);
}
} else {
mme_sess_remove(sess);
}
sess = next_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;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
xact = ogs_gtp_xact_cycle(bearer->create.xact);
ogs_assert(xact);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_BEARER_RESPONSE_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_bearer_response(h.type, bearer, cause_value);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
ogs_expect_or_return_val(rv == OGS_OK, 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;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
xact = ogs_gtp_xact_cycle(bearer->update.xact);
ogs_assert(xact);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_UPDATE_BEARER_RESPONSE_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_update_bearer_response(h.type, bearer, cause_value);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
ogs_expect_or_return_val(rv == OGS_OK, 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;
ogs_gtp2_header_t h;
ogs_pkbuf_t *pkbuf = NULL;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
xact = ogs_gtp_xact_cycle(bearer->delete.xact);
ogs_assert(xact);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_delete_bearer_response(h.type, bearer, cause_value);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
rv = ogs_gtp_xact_update_tx(xact, &h, pkbuf);
ogs_expect_or_return_val(rv == OGS_OK, 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;
ogs_assert(action);
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_RELEASE_ACCESS_BEARERS_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_release_access_bearers_request(h.type);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, mme_ue);
ogs_expect_or_return_val(xact, OGS_ERROR);
xact->release_action = action;
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;
ogs_list_for_each(&enb->enb_ue_list, enb_ue) {
mme_ue = enb_ue->mme_ue;
if (mme_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;
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);
ogs_assert(xact);
mme_ue = bearer->mme_ue;
ogs_assert(mme_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 = mme_ue->sgw_s11_teid;
s11buf = mme_s11_build_downlink_data_notification_ack(h.type, cause_value);
ogs_expect_or_return_val(s11buf, OGS_ERROR);
rv = ogs_gtp_xact_update_tx(xact, &h, s11buf);
ogs_expect_or_return_val(rv == OGS_OK, 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;
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_CREATE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_create_indirect_data_forwarding_tunnel_request(
h.type, mme_ue);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, mme_ue);
ogs_expect_or_return_val(xact, OGS_ERROR);
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;
ogs_assert(action);
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_DELETE_INDIRECT_DATA_FORWARDING_TUNNEL_REQUEST_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = ogs_pkbuf_alloc(NULL, OGS_TLV_MAX_HEADROOM);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
ogs_pkbuf_reserve(pkbuf, OGS_TLV_MAX_HEADROOM);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, mme_ue);
ogs_expect_or_return_val(xact, OGS_ERROR);
xact->delete_indirect_action = action;
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;
ogs_assert(bearer);
mme_ue = bearer->mme_ue;
ogs_assert(mme_ue);
memset(&h, 0, sizeof(ogs_gtp2_header_t));
h.type = OGS_GTP2_BEARER_RESOURCE_COMMAND_TYPE;
h.teid = mme_ue->sgw_s11_teid;
pkbuf = mme_s11_build_bearer_resource_command(h.type, bearer, nas_message);
ogs_expect_or_return_val(pkbuf, OGS_ERROR);
xact = ogs_gtp_xact_local_create(mme_ue->gnode, &h, pkbuf, timeout, bearer);
ogs_expect_or_return_val(xact, OGS_ERROR);
xact->xid |= OGS_GTP_CMD_XACT_ID;
rv = ogs_gtp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
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