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/*
* Copyright (C) 2023 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"
void sepp_state_initial(ogs_fsm_t *s, sepp_event_t *e)
{
sepp_sm_debug(e);
ogs_assert(s);
OGS_FSM_TRAN(s, &sepp_state_operational);
}
void sepp_state_final(ogs_fsm_t *s, sepp_event_t *e)
{
sepp_sm_debug(e);
ogs_assert(s);
}
void sepp_state_operational(ogs_fsm_t *s, sepp_event_t *e)
{
int rv;
sepp_node_t *sepp_node = NULL;
ogs_sbi_stream_t *stream = NULL;
ogs_pool_id_t stream_id = OGS_INVALID_POOL_ID;
ogs_sbi_request_t *request = NULL;
ogs_sbi_server_t *server = NULL;
ogs_sbi_nf_instance_t *nf_instance = NULL;
ogs_sbi_subscription_data_t *subscription_data = NULL;
ogs_sbi_response_t *response = NULL;
ogs_sbi_message_t message;
sepp_sm_debug(e);
ogs_assert(s);
switch (e->h.id) {
case OGS_FSM_ENTRY_SIG:
break;
case OGS_FSM_EXIT_SIG:
break;
case OGS_EVENT_SBI_SERVER:
request = e->h.sbi.request;
ogs_assert(request);
stream_id = OGS_POINTER_TO_UINT(e->h.sbi.data);
ogs_assert(stream_id >= OGS_MIN_POOL_ID &&
stream_id <= OGS_MAX_POOL_ID);
stream = ogs_sbi_stream_find_by_id(stream_id);
if (!stream) {
ogs_error("STREAM has already been removed [%d]", stream_id);
break;
}
server = ogs_sbi_server_from_stream(stream);
ogs_assert(server);
rv = ogs_sbi_parse_request(&message, request);
if (rv != OGS_OK) {
/* 'sbi_message' buffer is released in ogs_sbi_parse_request() */
ogs_error("cannot parse HTTP sbi_message");
ogs_assert(true ==
ogs_sbi_server_send_error(
stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
NULL, "cannot parse HTTP sbi_message", NULL, NULL));
break;
}
if (strcmp(message.h.api.version, OGS_SBI_API_V1) != 0) {
ogs_error("Not supported version [%s]", message.h.api.version);
ogs_assert(true ==
ogs_sbi_server_send_error(
stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
&message, "Not supported version", NULL, NULL));
ogs_sbi_message_free(&message);
break;
}
SWITCH(message.h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NNRF_NFM)
if (server->interface &&
strcmp(server->interface, OGS_SBI_INTERFACE_NAME_SEPP) == 0) {
ogs_error("[DROP] Peer SEPP is using the wrong interface[%s]",
server->interface);
break;
}
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_NF_STATUS_NOTIFY)
SWITCH(message.h.method)
CASE(OGS_SBI_HTTP_METHOD_POST)
ogs_nnrf_nfm_handle_nf_status_notify(stream, &message);
break;
DEFAULT
ogs_error("Invalid HTTP method [%s]", message.h.method);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_FORBIDDEN, &message,
"Invalid HTTP method", message.h.method, NULL));
END
break;
DEFAULT
ogs_error("Invalid resource name [%s]",
message.h.resource.component[0]);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
"Invalid resource name",
message.h.resource.component[0], NULL));
END
break;
CASE(OGS_SBI_SERVICE_NAME_N32C_HANDSHAKE)
if (!server->interface &&
ogs_sbi_server_first_by_interface(
OGS_SBI_INTERFACE_NAME_SEPP)) {
ogs_error("[DROP] Peer SEPP is using the wrong interface[sbi]");
break;
}
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_EXCHANGE_CAPABILITY)
SWITCH(message.h.method)
CASE(OGS_SBI_HTTP_METHOD_POST)
if (message.SecNegotiateReqData &&
message.SecNegotiateReqData->sender) {
sepp_node = sepp_node_find_by_receiver(
message.SecNegotiateReqData->sender);
if (!sepp_node) {
sepp_node = sepp_node_add(
message.SecNegotiateReqData->sender);
ogs_assert(sepp_node);
sepp_handshake_fsm_init(sepp_node, false);
}
}
break;
DEFAULT
ogs_error("Invalid HTTP method [%s]", message.h.method);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_FORBIDDEN, &message,
"Invalid HTTP method", message.h.method, NULL));
END
break;
DEFAULT
ogs_error("Invalid resource name [%s]",
message.h.resource.component[0]);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
"Invalid resource name",
message.h.resource.component[0], NULL));
END
if (!sepp_node) {
ogs_error("Not found [%s]", message.h.method);
ogs_assert(true ==
ogs_sbi_server_send_error(
stream, OGS_SBI_HTTP_STATUS_NOT_FOUND,
&message, "Not found", message.h.method, NULL));
break;
}
ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
e->sepp_node = sepp_node;
e->h.sbi.message = &message;
ogs_fsm_dispatch(&sepp_node->sm, e);
if (OGS_FSM_CHECK(&sepp_node->sm, sepp_handshake_state_exception))
ogs_error("[%s] State machine exception", sepp_node->receiver);
break;
DEFAULT
ogs_error("Invalid API name [%s]", message.h.service.name);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
"Invalid API name", message.h.service.name, NULL));
END
/* In lib/sbi/server.c, notify_completed() releases 'request' buffer. */
ogs_sbi_message_free(&message);
break;
case OGS_EVENT_SBI_CLIENT:
ogs_assert(e);
response = e->h.sbi.response;
ogs_assert(response);
rv = ogs_sbi_parse_response(&message, response);
if (rv != OGS_OK) {
ogs_error("cannot parse HTTP response");
ogs_sbi_message_free(&message);
ogs_sbi_response_free(response);
break;
}
if (strcmp(message.h.api.version, OGS_SBI_API_V1) != 0) {
ogs_error("Not supported version [%s]", message.h.api.version);
ogs_sbi_message_free(&message);
ogs_sbi_response_free(response);
break;
}
SWITCH(message.h.service.name)
CASE(OGS_SBI_SERVICE_NAME_NNRF_NFM)
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_NF_INSTANCES)
ogs_fsm_handler_t old_state;
nf_instance = e->h.sbi.data;
ogs_assert(nf_instance);
old_state = OGS_FSM_STATE(&nf_instance->sm);
ogs_assert(old_state);
e->h.sbi.message = &message;
ogs_fsm_dispatch(&nf_instance->sm, e);
/*
* The SEPP on the H-PLMN should send a n32c-handshake message
* with the Sender PLMN-ID. Otherwise, the UE in the V-PLMN cannot
* find the SEPP in the H-PLMN during the REGISTRATION.
*
* Since SEPP's PLMN-ID can be received when registering with NRF,
* n32c-handshake messages could be started after that.
*
* To confirm that the PLMN-ID has been received from the NRF,
* we check if the NF state has changed from
* ogs_sbi_nf_state_will_register to ogs_sbi_nf_state_registered.
*/
if (old_state ==
(ogs_fsm_handler_t)ogs_sbi_nf_state_will_register &&
OGS_FSM_CHECK(&nf_instance->sm,
ogs_sbi_nf_state_registered)) {
/* Initialize SEPP Peer List */
ogs_list_for_each(&sepp_self()->peer_list, sepp_node) {
/*
* Since FSM initialization only needs to be done once
* at the beginning, it only performs initialization
* when the state variable(OGS_FSM_STATE()) is NULL.
*/
if (!OGS_FSM_STATE(&sepp_node->sm))
sepp_handshake_fsm_init(sepp_node, true);
}
}
break;
CASE(OGS_SBI_RESOURCE_NAME_SUBSCRIPTIONS)
subscription_data = e->h.sbi.data;
ogs_assert(subscription_data);
SWITCH(message.h.method)
CASE(OGS_SBI_HTTP_METHOD_POST)
if (message.res_status == OGS_SBI_HTTP_STATUS_CREATED ||
message.res_status == OGS_SBI_HTTP_STATUS_OK) {
ogs_nnrf_nfm_handle_nf_status_subscribe(
subscription_data, &message);
} else {
ogs_error("HTTP response error : %d",
message.res_status);
}
break;
CASE(OGS_SBI_HTTP_METHOD_PATCH)
if (message.res_status == OGS_SBI_HTTP_STATUS_OK ||
message.res_status == OGS_SBI_HTTP_STATUS_NO_CONTENT) {
ogs_nnrf_nfm_handle_nf_status_update(
subscription_data, &message);
} else {
ogs_error("[%s] HTTP response error [%d]",
subscription_data->id ?
subscription_data->id : "Unknown",
message.res_status);
}
break;
CASE(OGS_SBI_HTTP_METHOD_DELETE)
if (message.res_status == OGS_SBI_HTTP_STATUS_NO_CONTENT) {
ogs_sbi_subscription_data_remove(subscription_data);
} else {
ogs_error("[%s] HTTP response error [%d]",
subscription_data->id ?
subscription_data->id : "Unknown",
message.res_status);
}
break;
DEFAULT
ogs_error("Invalid HTTP method [%s]", message.h.method);
ogs_assert_if_reached();
END
break;
DEFAULT
ogs_error("Invalid resource name [%s]",
message.h.resource.component[0]);
ogs_assert_if_reached();
END
break;
CASE(OGS_SBI_SERVICE_NAME_N32C_HANDSHAKE)
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_EXCHANGE_CAPABILITY)
sepp_node = e->h.sbi.data;
ogs_assert(sepp_node);
ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
e->sepp_node = sepp_node;
e->h.sbi.message = &message;
ogs_fsm_dispatch(&sepp_node->sm, e);
break;
DEFAULT
ogs_error("Invalid resource name [%s]",
message.h.resource.component[0]);
ogs_assert_if_reached();
END
break;
DEFAULT
ogs_error("Invalid service name [%s]", message.h.service.name);
ogs_assert_if_reached();
END
ogs_sbi_message_free(&message);
ogs_sbi_response_free(response);
break;
case OGS_EVENT_SBI_TIMER:
ogs_assert(e);
switch(e->h.timer_id) {
case SEPP_TIMER_PEER_ESTABLISH:
sepp_node = e->sepp_node;
ogs_assert(sepp_node);
ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
ogs_fsm_dispatch(&sepp_node->sm, e);
if (OGS_FSM_CHECK(&sepp_node->sm, sepp_handshake_state_exception))
ogs_error("[%s] State machine exception [%d]",
sepp_node->receiver, e->h.timer_id);
break;
case OGS_TIMER_NF_INSTANCE_REGISTRATION_INTERVAL:
case OGS_TIMER_NF_INSTANCE_HEARTBEAT_INTERVAL:
case OGS_TIMER_NF_INSTANCE_NO_HEARTBEAT:
case OGS_TIMER_NF_INSTANCE_VALIDITY:
nf_instance = e->h.sbi.data;
ogs_assert(nf_instance);
ogs_assert(OGS_FSM_STATE(&nf_instance->sm));
ogs_fsm_dispatch(&nf_instance->sm, e);
if (OGS_FSM_CHECK(&nf_instance->sm, ogs_sbi_nf_state_exception))
ogs_error("[%s:%s] State machine exception [%d]",
OpenAPI_nf_type_ToString(nf_instance->nf_type),
nf_instance->id, e->h.timer_id);
break;
case OGS_TIMER_SUBSCRIPTION_VALIDITY:
subscription_data = e->h.sbi.data;
ogs_assert(subscription_data);
ogs_assert(true ==
ogs_nnrf_nfm_send_nf_status_subscribe(
ogs_sbi_self()->nf_instance->nf_type,
subscription_data->req_nf_instance_id,
subscription_data->subscr_cond.nf_type,
subscription_data->subscr_cond.service_name));
ogs_error("[%s] Subscription validity expired",
subscription_data->id);
ogs_sbi_subscription_data_remove(subscription_data);
break;
case OGS_TIMER_SUBSCRIPTION_PATCH:
subscription_data = e->h.sbi.data;
ogs_assert(subscription_data);
ogs_assert(true ==
ogs_nnrf_nfm_send_nf_status_update(subscription_data));
ogs_info("[%s] Need to update Subscription",
subscription_data->id);
break;
default:
ogs_error("Unknown timer[%s:%d]",
ogs_timer_get_name(e->h.timer_id), e->h.timer_id);
}
break;
default:
ogs_error("No handler for event %s", sepp_event_get_name(e));
break;
}
}
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