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open5gs/src/sgwc/pfcp-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 "pfcp-path.h"
static void pfcp_node_fsm_init(ogs_pfcp_node_t *node, bool try_to_assoicate)
{
sgwc_event_t e;
ogs_assert(node);
memset(&e, 0, sizeof(e));
e.pfcp_node = node;
if (try_to_assoicate == true) {
node->t_association = ogs_timer_add(ogs_app()->timer_mgr,
sgwc_timer_pfcp_association, node);
ogs_assert(node->t_association);
}
ogs_fsm_init(&node->sm, sgwc_pfcp_state_initial, sgwc_pfcp_state_final, &e);
}
static void pfcp_node_fsm_fini(ogs_pfcp_node_t *node)
{
sgwc_event_t e;
ogs_assert(node);
memset(&e, 0, sizeof(e));
e.pfcp_node = node;
ogs_fsm_fini(&node->sm, &e);
if (node->t_association)
ogs_timer_delete(node->t_association);
}
static void pfcp_recv_cb(short when, ogs_socket_t fd, void *data)
{
int rv;
ssize_t size;
sgwc_event_t *e = NULL;
ogs_pkbuf_t *pkbuf = NULL;
ogs_sockaddr_t from;
ogs_pfcp_node_t *node = NULL;
ogs_pfcp_header_t *h = 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);
h = (ogs_pfcp_header_t *)pkbuf->data;
if (h->version != OGS_PFCP_VERSION) {
ogs_pfcp_header_t rsp;
ogs_error("Not supported version[%d]", h->version);
memset(&rsp, 0, sizeof rsp);
rsp.flags = (OGS_PFCP_VERSION << 5);
rsp.type = OGS_PFCP_VERSION_NOT_SUPPORTED_RESPONSE_TYPE;
rsp.length = htobe16(4);
rsp.sqn_only = h->sqn_only;
if (ogs_sendto(fd, &rsp, 8, 0, &from) < 0) {
ogs_log_message(OGS_LOG_ERROR, ogs_socket_errno,
"ogs_sendto() failed");
}
ogs_pkbuf_free(pkbuf);
return;
}
e = sgwc_event_new(SGWC_EVT_SXA_MESSAGE);
ogs_assert(e);
node = ogs_pfcp_node_find(&ogs_pfcp_self()->pfcp_peer_list, &from);
if (!node) {
node = ogs_pfcp_node_add(&ogs_pfcp_self()->pfcp_peer_list, &from);
if (!node) {
ogs_error("No memory: ogs_pfcp_node_add() failed");
ogs_pkbuf_free(e->pkbuf);
ogs_event_free(e);
return;
}
node->sock = data;
pfcp_node_fsm_init(node, false);
}
e->pfcp_node = node;
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);
sgwc_event_free(e);
}
}
int sgwc_pfcp_open(void)
{
ogs_socknode_t *node = NULL;
ogs_sock_t *sock = NULL;
/* PFCP Server */
ogs_list_for_each(&ogs_pfcp_self()->pfcp_list, node) {
sock = ogs_pfcp_server(node);
if (!sock) return OGS_ERROR;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, pfcp_recv_cb, sock);
ogs_assert(node->poll);
}
ogs_list_for_each(&ogs_pfcp_self()->pfcp_list6, node) {
sock = ogs_pfcp_server(node);
if (!sock) return OGS_ERROR;
node->poll = ogs_pollset_add(ogs_app()->pollset,
OGS_POLLIN, sock->fd, pfcp_recv_cb, sock);
ogs_assert(node->poll);
}
OGS_SETUP_PFCP_SERVER;
return OGS_OK;
}
void sgwc_pfcp_close(void)
{
ogs_pfcp_node_t *pfcp_node = NULL;
ogs_list_for_each(&ogs_pfcp_self()->pfcp_peer_list, pfcp_node)
pfcp_node_fsm_fini(pfcp_node);
ogs_freeaddrinfo(ogs_pfcp_self()->pfcp_advertise);
ogs_freeaddrinfo(ogs_pfcp_self()->pfcp_advertise6);
ogs_socknode_remove_all(&ogs_pfcp_self()->pfcp_list);
ogs_socknode_remove_all(&ogs_pfcp_self()->pfcp_list6);
}
static void sess_timeout(ogs_pfcp_xact_t *xact, void *data)
{
uint8_t type;
ogs_assert(xact);
type = xact->seq[0].type;
switch (type) {
case OGS_PFCP_SESSION_ESTABLISHMENT_REQUEST_TYPE:
ogs_error("No PFCP session establishment response");
break;
case OGS_PFCP_SESSION_MODIFICATION_REQUEST_TYPE:
ogs_error("No PFCP session modification response");
break;
case OGS_PFCP_SESSION_DELETION_REQUEST_TYPE:
ogs_error("No PFCP session deletion response");
break;
default:
ogs_error("Not implemented [type:%d]", type);
break;
}
}
static void bearer_timeout(ogs_pfcp_xact_t *xact, void *data)
{
uint8_t type;
ogs_assert(xact);
type = xact->seq[0].type;
switch (type) {
case OGS_PFCP_SESSION_MODIFICATION_REQUEST_TYPE:
ogs_error("No PFCP session modification response");
break;
default:
ogs_error("Not implemented [type:%d]", type);
break;
}
}
int sgwc_pfcp_send_bearer_to_modify_list(
sgwc_sess_t *sess, ogs_pfcp_xact_t *xact)
{
int rv;
ogs_pkbuf_t *sxabuf = NULL;
ogs_pfcp_header_t h;
ogs_assert(sess);
ogs_assert(xact);
xact->local_seid = sess->sgwc_sxa_seid;
memset(&h, 0, sizeof(ogs_pfcp_header_t));
h.type = OGS_PFCP_SESSION_MODIFICATION_REQUEST_TYPE;
h.seid_presence = OGS_PFCP_SEID_PRESENCE;
h.seid = sess->sgwu_sxa_seid;
sxabuf = sgwc_sxa_build_bearer_to_modify_list(h.type, sess, xact);
if (!sxabuf) {
ogs_error("sgwc_sxa_build_bearer_to_modify_list() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_update_tx(xact, &h, sxabuf);
if (rv != OGS_OK) {
ogs_error("ogs_pfcp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int sgwc_pfcp_send_session_establishment_request(
sgwc_sess_t *sess, ogs_gtp_xact_t *gtp_xact, ogs_pkbuf_t *gtpbuf,
uint64_t flags)
{
int rv;
ogs_pkbuf_t *sxabuf = NULL;
ogs_pfcp_header_t h;
ogs_pfcp_xact_t *xact = NULL;
ogs_assert(sess);
xact = ogs_pfcp_xact_local_create(sess->pfcp_node, sess_timeout, sess);
if (!xact) {
ogs_error("ogs_pfcp_xact_local_create() failed");
return OGS_ERROR;
}
xact->assoc_xact = gtp_xact;
if (gtpbuf) {
xact->gtpbuf = ogs_pkbuf_copy(gtpbuf);
if (!xact->gtpbuf) {
ogs_error("ogs_pkbuf_copy() failed");
return OGS_ERROR;
}
}
xact->local_seid = sess->sgwc_sxa_seid;
xact->create_flags = flags;
memset(&h, 0, sizeof(ogs_pfcp_header_t));
h.type = OGS_PFCP_SESSION_ESTABLISHMENT_REQUEST_TYPE;
/*
* 7.2.2.4.2 Conditions for Sending SEID=0 in PFCP Header
*
* If a peer's SEID is not available, the SEID field shall still be present
* in the header and its value shall be set to "0" in the following messages:
*
* - PFCP Session Establishment Request message on Sxa/Sxb/Sxc/N4;
*
* - If a node receives a message for which it has no session, i.e.
* if SEID in the PFCP header is not known, it shall respond
* with "Session context not found" cause in the corresponding
* response message to the sender, the SEID used in the PFCP header
* in the response message shall be then set to "0";
*
* - If a node receives a request message containing protocol error,
* e.g. Mandatory IE missing, which requires the receiver
* to reject the message as specified in clause 7.6, it shall reject
* the request message. For the response message, the node should look up
* the remote peer's SEID and accordingly set SEID in the PFCP header
* and the message cause code. As an implementation option,
* the node may not look up the remote peer's SEID and
* set the PFCP header SEID to "0" in the response message.
* However in this case, the cause value shall not be set
* to "Session not found".
*
* - When the UP function sends PFCP Session Report Request message
* over N4 towards another SMF or another PFCP entity in the SMF
* as specified in clause 5.22.2 and clause 5.22.3.
*/
h.seid_presence = OGS_PFCP_SEID_PRESENCE;
h.seid = sess->sgwu_sxa_seid;
sxabuf = sgwc_sxa_build_session_establishment_request(h.type, sess);
if (!sxabuf) {
ogs_error("sgwc_sxa_build_session_establishment_request() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_update_tx(xact, &h, sxabuf);
if (rv != OGS_OK) {
ogs_error("ogs_pfcp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int sgwc_pfcp_send_session_modification_request(
sgwc_sess_t *sess, ogs_gtp_xact_t *gtp_xact,
ogs_pkbuf_t *gtpbuf, uint64_t flags)
{
ogs_pfcp_xact_t *xact = NULL;
sgwc_bearer_t *bearer = NULL;
ogs_assert(sess);
xact = ogs_pfcp_xact_local_create(sess->pfcp_node, sess_timeout, sess);
if (!xact) {
ogs_error("ogs_pfcp_xact_local_create() failed");
return OGS_ERROR;
}
xact->assoc_xact = gtp_xact;
xact->modify_flags = flags | OGS_PFCP_MODIFY_SESSION;
if (gtpbuf) {
xact->gtpbuf = ogs_pkbuf_copy(gtpbuf);
if (!xact->gtpbuf) {
ogs_error("ogs_pkbuf_copy() failed");
return OGS_ERROR;
}
}
xact->local_seid = sess->sgwc_sxa_seid;
ogs_list_for_each(&sess->bearer_list, bearer)
ogs_list_add(&xact->bearer_to_modify_list, &bearer->to_modify_node);
return sgwc_pfcp_send_bearer_to_modify_list(sess, xact);
}
int sgwc_pfcp_send_bearer_modification_request(
sgwc_bearer_t *bearer, ogs_gtp_xact_t *gtp_xact,
ogs_pkbuf_t *gtpbuf, uint64_t flags)
{
int rv;
ogs_pkbuf_t *sxabuf = NULL;
ogs_pfcp_header_t h;
ogs_pfcp_xact_t *xact = NULL;
sgwc_sess_t *sess = NULL;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
xact = ogs_pfcp_xact_local_create(sess->pfcp_node, bearer_timeout, bearer);
if (!xact) {
ogs_error("ogs_pfcp_xact_local_create() failed");
return OGS_ERROR;
}
xact->assoc_xact = gtp_xact;
xact->modify_flags = flags;
if (gtpbuf) {
xact->gtpbuf = ogs_pkbuf_copy(gtpbuf);
if (!xact->gtpbuf) {
ogs_error("ogs_pkbuf_copy() failed");
return OGS_ERROR;
}
}
xact->local_seid = sess->sgwc_sxa_seid;
ogs_list_add(&xact->bearer_to_modify_list, &bearer->to_modify_node);
memset(&h, 0, sizeof(ogs_pfcp_header_t));
h.type = OGS_PFCP_SESSION_MODIFICATION_REQUEST_TYPE;
h.seid_presence = OGS_PFCP_SEID_PRESENCE;
h.seid = sess->sgwu_sxa_seid;
sxabuf = sgwc_sxa_build_bearer_to_modify_list(h.type, sess, xact);
if (!sxabuf) {
ogs_error("sgwc_sxa_build_bearer_to_modify_list() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_update_tx(xact, &h, sxabuf);
if (rv != OGS_OK) {
ogs_error("ogs_pfcp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int sgwc_pfcp_send_session_deletion_request(
sgwc_sess_t *sess, ogs_gtp_xact_t *gtp_xact, ogs_pkbuf_t *gtpbuf)
{
int rv;
ogs_pkbuf_t *sxabuf = NULL;
ogs_pfcp_header_t h;
ogs_pfcp_xact_t *xact = NULL;
ogs_assert(sess);
xact = ogs_pfcp_xact_local_create(sess->pfcp_node, sess_timeout, sess);
if (!xact) {
ogs_error("ogs_pfcp_xact_local_create() failed");
return OGS_ERROR;
}
xact->assoc_xact = gtp_xact;
if (gtpbuf) {
xact->gtpbuf = ogs_pkbuf_copy(gtpbuf);
if (!xact->gtpbuf) {
ogs_error("ogs_pkbuf_copy() failed");
return OGS_ERROR;
}
}
xact->local_seid = sess->sgwc_sxa_seid;
memset(&h, 0, sizeof(ogs_pfcp_header_t));
h.type = OGS_PFCP_SESSION_DELETION_REQUEST_TYPE;
h.seid_presence = OGS_PFCP_SEID_PRESENCE;
h.seid = sess->sgwu_sxa_seid;
sxabuf = sgwc_sxa_build_session_deletion_request(h.type, sess);
if (!sxabuf) {
ogs_error("sgwc_sxa_build_session_deletion_request() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_update_tx(xact, &h, sxabuf);
if (rv != OGS_OK) {
ogs_error("ogs_pfcp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
int sgwc_pfcp_send_session_report_response(
ogs_pfcp_xact_t *xact, sgwc_sess_t *sess, uint8_t cause)
{
int rv;
ogs_pkbuf_t *sxabuf = NULL;
ogs_pfcp_header_t h;
memset(&h, 0, sizeof(ogs_pfcp_header_t));
h.type = OGS_PFCP_SESSION_REPORT_RESPONSE_TYPE;
h.seid_presence = OGS_PFCP_SEID_PRESENCE;
h.seid = sess->sgwu_sxa_seid;
sxabuf = ogs_pfcp_build_session_report_response(h.type, cause);
if (!sxabuf) {
ogs_error("ogs_pfcp_build_session_report_response() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_update_tx(xact, &h, sxabuf);
if (rv != OGS_OK) {
ogs_error("ogs_pfcp_xact_update_tx() failed");
return OGS_ERROR;
}
rv = ogs_pfcp_xact_commit(xact);
ogs_expect(rv == OGS_OK);
return rv;
}
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