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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 "upf-sm.h"
#include "context.h"
#include "event.h"
#include "pfcp-path.h"
#include "gtp-path.h"
void upf_state_initial(ogs_fsm_t *s, upf_event_t *e)
{
upf_sm_debug(e);
ogs_assert(s);
OGS_FSM_TRAN(s, &upf_state_operational);
}
void upf_state_final(ogs_fsm_t *s, upf_event_t *e)
{
upf_sm_debug(e);
ogs_assert(s);
}
void upf_state_operational(ogs_fsm_t *s, upf_event_t *e)
{
int rv;
ogs_pkbuf_t *recvbuf = NULL;
ogs_pfcp_message_t *pfcp_message = NULL;
ogs_pfcp_node_t *node = NULL;
ogs_pfcp_xact_t *xact = NULL;
upf_sm_debug(e);
ogs_assert(s);
switch (e->id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case UPF_EVT_N4_MESSAGE:
ogs_assert(e);
recvbuf = e->pkbuf;
ogs_assert(recvbuf);
node = e->pfcp_node;
ogs_assert(node);
/*
* Issue #1911
*
* Because ogs_pfcp_message_t is over 80kb in size,
* it can cause stack overflow.
* To avoid this, the pfcp_message structure uses heap memory.
*/
if ((pfcp_message = ogs_pfcp_parse_msg(recvbuf)) == NULL) {
ogs_error("ogs_pfcp_parse_msg() failed");
ogs_pkbuf_free(recvbuf);
break;
}
rv = ogs_pfcp_xact_receive(node, &pfcp_message->h, &xact);
if (rv != OGS_OK) {
ogs_pkbuf_free(recvbuf);
ogs_pfcp_message_free(pfcp_message);
break;
}
e->pfcp_message = pfcp_message;
e->pfcp_xact_id = xact ? xact->id : OGS_INVALID_POOL_ID;
ogs_fsm_dispatch(&node->sm, e);
if (OGS_FSM_CHECK(&node->sm, upf_pfcp_state_exception)) {
ogs_error("PFCP state machine exception");
}
ogs_pkbuf_free(recvbuf);
ogs_pfcp_message_free(pfcp_message);
break;
case UPF_EVT_N4_TIMER:
case UPF_EVT_N4_NO_HEARTBEAT:
node = e->pfcp_node;
ogs_assert(node);
ogs_assert(OGS_FSM_STATE(&node->sm));
ogs_fsm_dispatch(&node->sm, e);
break;
default:
ogs_error("No handler for event %s", upf_event_get_name(e));
break;
}
}
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