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open5gs/src/smf/pfcp-sm.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 "sbi-path.h"
#include "pfcp-path.h"
#include "n4-handler.h"
static void pfcp_restoration(ogs_pfcp_node_t *node);
static void reselect_upf(ogs_pfcp_node_t *node);
static void node_timeout(ogs_pfcp_xact_t *xact, void *data);
void smf_pfcp_state_initial(ogs_fsm_t *s, smf_event_t *e)
{
int rv;
ogs_pfcp_node_t *node = NULL;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
node = e->pfcp_node;
ogs_assert(node);
rv = ogs_pfcp_connect(
ogs_pfcp_self()->pfcp_sock, ogs_pfcp_self()->pfcp_sock6, node);
ogs_assert(rv == OGS_OK);
node->t_no_heartbeat = ogs_timer_add(ogs_app()->timer_mgr,
smf_timer_pfcp_no_heartbeat, node);
ogs_assert(node->t_no_heartbeat);
OGS_FSM_TRAN(s, &smf_pfcp_state_will_associate);
}
void smf_pfcp_state_final(ogs_fsm_t *s, smf_event_t *e)
{
ogs_pfcp_node_t *node = NULL;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
node = e->pfcp_node;
ogs_assert(node);
ogs_timer_delete(node->t_no_heartbeat);
}
void smf_pfcp_state_will_associate(ogs_fsm_t *s, smf_event_t *e)
{
char buf[OGS_ADDRSTRLEN];
ogs_pfcp_node_t *node = NULL;
ogs_pfcp_xact_t *xact = NULL;
ogs_pfcp_message_t *message = NULL;
ogs_sockaddr_t *addr = NULL;
smf_sess_t *sess;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
node = e->pfcp_node;
ogs_assert(node);
addr = node->sa_list;
ogs_assert(addr);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
if (node->t_association) {
ogs_timer_start(node->t_association,
ogs_local_conf()->time.message.pfcp.association_interval);
ogs_pfcp_cp_send_association_setup_request(node, node_timeout);
}
break;
case OGS_FSM_EXIT_SIG:
if (node->t_association) {
ogs_timer_stop(node->t_association);
}
break;
case SMF_EVT_N4_TIMER:
switch(e->h.timer_id) {
case SMF_TIMER_PFCP_ASSOCIATION:
node = e->pfcp_node;
ogs_assert(node);
ogs_warn("Retry association with peer [%s]:%d failed",
OGS_ADDR(addr, buf), OGS_PORT(addr));
ogs_assert(node->t_association);
ogs_timer_start(node->t_association,
ogs_local_conf()->time.message.pfcp.association_interval);
ogs_pfcp_cp_send_association_setup_request(node, node_timeout);
break;
case SMF_TIMER_PFCP_NO_ESTABLISHMENT_RESPONSE:
sess = e->sess;
sess = smf_sess_cycle(sess);
if (!sess) {
ogs_warn("Session has already been removed");
break;
}
ogs_fsm_dispatch(&sess->sm, e);
break;
default:
ogs_error("Unknown timer[%s:%d]",
smf_timer_get_name(e->h.timer_id), e->h.timer_id);
break;
}
break;
case SMF_EVT_N4_MESSAGE:
message = e->pfcp_message;
ogs_assert(message);
xact = e->pfcp_xact;
ogs_assert(xact);
switch (message->h.type) {
case OGS_PFCP_HEARTBEAT_REQUEST_TYPE:
ogs_expect(true ==
ogs_pfcp_handle_heartbeat_request(node, xact,
&message->pfcp_heartbeat_request));
break;
case OGS_PFCP_HEARTBEAT_RESPONSE_TYPE:
ogs_expect(true ==
ogs_pfcp_handle_heartbeat_response(node, xact,
&message->pfcp_heartbeat_response));
break;
case OGS_PFCP_ASSOCIATION_SETUP_REQUEST_TYPE:
ogs_pfcp_cp_handle_association_setup_request(node, xact,
&message->pfcp_association_setup_request);
OGS_FSM_TRAN(s, smf_pfcp_state_associated);
break;
case OGS_PFCP_ASSOCIATION_SETUP_RESPONSE_TYPE:
ogs_pfcp_cp_handle_association_setup_response(node, xact,
&message->pfcp_association_setup_response);
OGS_FSM_TRAN(s, smf_pfcp_state_associated);
break;
default:
ogs_warn("cannot handle PFCP message type[%d]",
message->h.type);
break;
}
break;
default:
ogs_error("Unknown event %s", smf_event_get_name(e));
break;
}
}
void smf_pfcp_state_associated(ogs_fsm_t *s, smf_event_t *e)
{
char buf[OGS_ADDRSTRLEN];
ogs_pfcp_node_t *node = NULL;
ogs_pfcp_xact_t *xact = NULL;
ogs_pfcp_message_t *message = NULL;
ogs_sockaddr_t *addr = NULL;
smf_sess_t *sess = NULL;
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
node = e->pfcp_node;
ogs_assert(node);
addr = node->sa_list;
ogs_assert(addr);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
ogs_info("PFCP associated [%s]:%d",
OGS_ADDR(&node->addr, buf),
OGS_PORT(&node->addr));
ogs_timer_start(node->t_no_heartbeat,
ogs_local_conf()->time.message.pfcp.no_heartbeat_duration);
ogs_assert(OGS_OK ==
ogs_pfcp_send_heartbeat_request(node, node_timeout));
if (node->restoration_required == true) {
pfcp_restoration(node);
node->restoration_required = false;
ogs_error("PFCP restoration");
}
break;
case OGS_FSM_EXIT_SIG:
ogs_info("PFCP de-associated [%s]:%d",
OGS_ADDR(&node->addr, buf),
OGS_PORT(&node->addr));
ogs_timer_stop(node->t_no_heartbeat);
break;
case SMF_EVT_N4_MESSAGE:
message = e->pfcp_message;
ogs_assert(message);
xact = e->pfcp_xact;
ogs_assert(xact);
if (message->h.seid_presence && message->h.seid != 0) {
sess = smf_sess_find_by_seid(message->h.seid);
} else if (xact->local_seid) { /* rx no SEID or SEID=0 */
/* 3GPP TS 29.244 7.2.2.4.2: we receive SEID=0 under some
* conditions, such as cause "Session context not found". In those
* cases, we still want to identify the local session which
* originated the message, so try harder by using the SEID we
* locally stored in xact when sending the original request: */
sess = smf_sess_find_by_seid(xact->local_seid);
}
if (sess)
e->sess = sess;
switch (message->h.type) {
case OGS_PFCP_HEARTBEAT_REQUEST_TYPE:
ogs_expect(true ==
ogs_pfcp_handle_heartbeat_request(node, xact,
&message->pfcp_heartbeat_request));
if (node->restoration_required == true) {
if (node->t_association) {
/*
* node->t_association that the PFCP entity attempts an association.
*
* In this case, even if Remote PFCP entity is restarted,
* PFCP restoration must be performed after PFCP association.
*
* Otherwise, Session related PFCP cannot be initiated
* because the peer PFCP entity is in a de-associated state.
*/
OGS_FSM_TRAN(s, smf_pfcp_state_will_associate);
} else {
/*
* If the peer PFCP entity is performing the association,
* Restoration can be performed immediately.
*/
pfcp_restoration(node);
node->restoration_required = false;
ogs_error("PFCP restoration");
}
}
break;
case OGS_PFCP_HEARTBEAT_RESPONSE_TYPE:
ogs_expect(true ==
ogs_pfcp_handle_heartbeat_response(node, xact,
&message->pfcp_heartbeat_response));
if (node->restoration_required == true) {
/*
* node->t_association that the PFCP entity attempts an association.
*
* In this case, even if Remote PFCP entity is restarted,
* PFCP restoration must be performed after PFCP association.
*
* Otherwise, Session related PFCP cannot be initiated
* because the peer PFCP entity is in a de-associated state.
*/
if (node->t_association) {
OGS_FSM_TRAN(s, smf_pfcp_state_will_associate);
} else {
/*
* If the peer PFCP entity is performing the association,
* Restoration can be performed immediately.
*/
pfcp_restoration(node);
node->restoration_required = false;
ogs_error("PFCP restoration");
}
}
break;
case OGS_PFCP_ASSOCIATION_SETUP_REQUEST_TYPE:
ogs_warn("PFCP[REQ] has already been associated [%s]:%d",
OGS_ADDR(&node->addr, buf),
OGS_PORT(&node->addr));
ogs_pfcp_cp_handle_association_setup_request(node, xact,
&message->pfcp_association_setup_request);
break;
case OGS_PFCP_ASSOCIATION_SETUP_RESPONSE_TYPE:
ogs_warn("PFCP[RSP] has already been associated [%s]:%d",
OGS_ADDR(&node->addr, buf),
OGS_PORT(&node->addr));
ogs_pfcp_cp_handle_association_setup_response(node, xact,
&message->pfcp_association_setup_response);
break;
case OGS_PFCP_SESSION_ESTABLISHMENT_RESPONSE_TYPE:
if (!message->h.seid_presence) ogs_error("No SEID");
if (!sess) {
ogs_gtp_xact_t *gtp_xact = xact->assoc_xact;
ogs_error("No Session");
if (!gtp_xact) {
ogs_error("No associated GTP transaction");
break;
}
if (gtp_xact->gtp_version == 1)
ogs_gtp1_send_error_message(gtp_xact, 0,
OGS_GTP1_CREATE_PDP_CONTEXT_RESPONSE_TYPE,
OGS_GTP1_CAUSE_CONTEXT_NOT_FOUND);
else
ogs_gtp2_send_error_message(gtp_xact,
OGS_GTP2_TEID_NO_PRESENCE, 0,
OGS_GTP2_CREATE_SESSION_RESPONSE_TYPE,
OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND);
break;
}
ogs_fsm_dispatch(&sess->sm, e);
break;
case OGS_PFCP_SESSION_MODIFICATION_RESPONSE_TYPE:
if (!message->h.seid_presence) ogs_error("No SEID");
if (xact->epc)
smf_epc_n4_handle_session_modification_response(
sess, xact, e->gtp2_message,
&message->pfcp_session_modification_response);
else
smf_5gc_n4_handle_session_modification_response(
sess, xact, &message->pfcp_session_modification_response);
break;
case OGS_PFCP_SESSION_DELETION_RESPONSE_TYPE:
if (!message->h.seid_presence) ogs_error("No SEID");
if (!sess) {
ogs_gtp_xact_t *gtp_xact = xact->assoc_xact;
ogs_error("No Session");
if (!gtp_xact) {
ogs_error("No associated GTP transaction");
break;
}
if (gtp_xact->gtp_version == 1)
ogs_gtp1_send_error_message(gtp_xact, 0,
OGS_GTP1_DELETE_PDP_CONTEXT_RESPONSE_TYPE,
OGS_GTP1_CAUSE_CONTEXT_NOT_FOUND);
else
ogs_gtp2_send_error_message(gtp_xact,
OGS_GTP2_TEID_NO_PRESENCE, 0,
OGS_GTP2_DELETE_SESSION_RESPONSE_TYPE,
OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND);
break;
}
ogs_fsm_dispatch(&sess->sm, e);
break;
case OGS_PFCP_SESSION_REPORT_REQUEST_TYPE:
if (!message->h.seid_presence) ogs_error("No SEID");
smf_n4_handle_session_report_request(
sess, xact, &message->pfcp_session_report_request);
break;
default:
ogs_error("Not implemented PFCP message type[%d]",
message->h.type);
break;
}
break;
case SMF_EVT_N4_TIMER:
switch(e->h.timer_id) {
case SMF_TIMER_PFCP_NO_HEARTBEAT:
node = e->pfcp_node;
ogs_assert(node);
ogs_assert(OGS_OK ==
ogs_pfcp_send_heartbeat_request(node, node_timeout));
break;
case SMF_TIMER_PFCP_NO_ESTABLISHMENT_RESPONSE:
sess = e->sess;
sess = smf_sess_cycle(sess);
if (!sess) {
ogs_warn("Session has already been removed");
break;
}
ogs_fsm_dispatch(&sess->sm, e);
break;
default:
ogs_error("Unknown timer[%s:%d]",
smf_timer_get_name(e->h.timer_id), e->h.timer_id);
break;
}
break;
case SMF_EVT_N4_NO_HEARTBEAT:
/* 'node' context was removed in ogs_pfcp_xact_delete(xact)
* So, we should not use PFCP node here */
ogs_warn("No Heartbeat from UPF [%s]:%d",
OGS_ADDR(addr, buf), OGS_PORT(addr));
OGS_FSM_TRAN(s, smf_pfcp_state_will_associate);
break;
default:
ogs_error("Unknown event %s", smf_event_get_name(e));
break;
}
}
void smf_pfcp_state_exception(ogs_fsm_t *s, smf_event_t *e)
{
ogs_assert(s);
ogs_assert(e);
smf_sm_debug(e);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
default:
ogs_error("Unknown event %s", smf_event_get_name(e));
break;
}
}
static void pfcp_restoration(ogs_pfcp_node_t *node)
{
smf_ue_t *smf_ue = NULL;
char buf1[OGS_ADDRSTRLEN];
char buf2[OGS_ADDRSTRLEN];
ogs_list_for_each(&smf_self()->smf_ue_list, smf_ue) {
smf_sess_t *sess = NULL;
ogs_assert(smf_ue);
ogs_list_for_each(&smf_ue->sess_list, sess) {
ogs_assert(sess);
if (node == sess->pfcp_node) {
if (sess->epc) {
ogs_info("UE IMSI[%s] APN[%s] IPv4[%s] IPv6[%s]",
smf_ue->imsi_bcd, sess->session.name,
sess->ipv4 ?
OGS_INET_NTOP(&sess->ipv4->addr, buf1) : "",
sess->ipv6 ?
OGS_INET6_NTOP(&sess->ipv6->addr, buf2) : "");
ogs_assert(OGS_OK ==
smf_epc_pfcp_send_session_establishment_request(
sess, NULL,
OGS_PFCP_CREATE_RESTORATION_INDICATION));
} else {
ogs_info("UE SUPI[%s] DNN[%s] IPv4[%s] IPv6[%s]",
smf_ue->supi, sess->session.name,
sess->ipv4 ?
OGS_INET_NTOP(&sess->ipv4->addr, buf1) : "",
sess->ipv6 ?
OGS_INET6_NTOP(&sess->ipv6->addr, buf2) : "");
ogs_assert(OGS_OK ==
smf_5gc_pfcp_send_session_establishment_request(
sess, OGS_PFCP_CREATE_RESTORATION_INDICATION));
}
}
}
}
}
static void reselect_upf(ogs_pfcp_node_t *node)
{
int r;
smf_ue_t *smf_ue = NULL;
ogs_pfcp_node_t *iter = NULL;
ogs_assert(node);
if (node->restoration_required == true) {
ogs_error("UPF has already been restarted");
return;
}
ogs_list_for_each(&ogs_pfcp_self()->pfcp_peer_list, iter) {
if (iter == node)
continue;
if (OGS_FSM_CHECK(&iter->sm, smf_pfcp_state_associated))
break;
}
if (iter == NULL) {
ogs_error("No UPF available");
return;
}
ogs_list_for_each(&smf_self()->smf_ue_list, smf_ue) {
smf_sess_t *sess = NULL, *next_sess = NULL;
ogs_list_for_each_safe(&smf_ue->sess_list, next_sess, sess) {
if (node == sess->pfcp_node) {
if (sess->epc) {
ogs_error("[%s:%s] EPC restoration is not implemented",
smf_ue->imsi_bcd, sess->session.name);
} else {
if (sess->policy_association_id) {
smf_npcf_smpolicycontrol_param_t param;
ogs_info("[%s:%d] SMF-initiated Deletion",
smf_ue->supi, sess->psi);
ogs_assert(sess->sm_context_ref);
memset(&param, 0, sizeof(param));
r = smf_sbi_discover_and_send(
OGS_SBI_SERVICE_TYPE_NPCF_SMPOLICYCONTROL, NULL,
smf_npcf_smpolicycontrol_build_delete,
sess, NULL,
OGS_PFCP_DELETE_TRIGGER_SMF_INITIATED,
&param);
ogs_expect(r == OGS_OK);
ogs_assert(r != OGS_ERROR);
} else {
ogs_error("[%s:%d] No PolicyAssociationId. "
"Forcibly remove SESSION",
smf_ue->supi, sess->psi);
SMF_SESS_CLEAR(sess);
}
}
}
}
}
}
static void node_timeout(ogs_pfcp_xact_t *xact, void *data)
{
int rv;
smf_event_t *e = NULL;
uint8_t type;
ogs_assert(xact);
type = xact->seq[0].type;
switch (type) {
case OGS_PFCP_HEARTBEAT_REQUEST_TYPE:
ogs_assert(data);
reselect_upf(data);
e = smf_event_new(SMF_EVT_N4_NO_HEARTBEAT);
e->pfcp_node = data;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ogs_queue_push() failed:%d", (int)rv);
ogs_event_free(e);
}
break;
case OGS_PFCP_ASSOCIATION_SETUP_REQUEST_TYPE:
break;
default:
ogs_error("Not implemented [type:%d]", type);
break;
}
}
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