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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 "nnrf-handler.h"
#include "nbsf-handler.h"
void bsf_state_initial(ogs_fsm_t *s, bsf_event_t *e)
{
bsf_sm_debug(e);
ogs_assert(s);
OGS_FSM_TRAN(s, &bsf_state_operational);
}
void bsf_state_final(ogs_fsm_t *s, bsf_event_t *e)
{
bsf_sm_debug(e);
ogs_assert(s);
}
void bsf_state_operational(ogs_fsm_t *s, bsf_event_t *e)
{
int rv;
bsf_sess_t *sess = 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_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;
ogs_sbi_xact_t *sbi_xact = NULL;
ogs_pool_id_t sbi_xact_id = OGS_INVALID_POOL_ID;
bsf_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;
}
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)
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_NBSF_MANAGEMENT)
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_PCF_BINDINGS)
if (message.h.resource.component[1]) {
sess = bsf_sess_find_by_binding_id(
message.h.resource.component[1]);
} else {
SWITCH(message.h.method)
CASE(OGS_SBI_HTTP_METHOD_POST)
if (message.PcfBinding &&
(message.PcfBinding->ipv4_addr ||
message.PcfBinding->ipv6_prefix)) {
if (message.PcfBinding->ipv4_addr)
sess = bsf_sess_find_by_ipv4addr(
message.PcfBinding->ipv4_addr);
if (!sess && message.PcfBinding->ipv6_prefix)
sess = bsf_sess_find_by_ipv6prefix(
message.PcfBinding->ipv6_prefix);
if (!sess) {
sess = bsf_sess_add_by_ip_address(
message.PcfBinding->ipv4_addr,
message.PcfBinding->ipv6_prefix);
ogs_assert(sess);
}
}
break;
CASE(OGS_SBI_HTTP_METHOD_GET)
if (message.param.ipv4addr)
sess = bsf_sess_find_by_ipv4addr(
message.param.ipv4addr);
if (!sess && message.param.ipv6prefix)
sess = bsf_sess_find_by_ipv6prefix(
message.param.ipv6prefix);
break;
DEFAULT
ogs_error("Invalid HTTP method [%s]", message.h.method);
END
}
if (!sess) {
ogs_error("Not found [%s]", message.h.uri);
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_NOT_FOUND,
&message, "Not found", message.h.uri, NULL));
break;
}
bsf_nbsf_management_handle_pcf_binding(sess, stream, &message);
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;
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)
nf_instance = e->h.sbi.data;
ogs_assert(nf_instance);
ogs_assert(OGS_FSM_STATE(&nf_instance->sm));
e->h.sbi.message = &message;
ogs_fsm_dispatch(&nf_instance->sm, e);
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_NNRF_DISC)
SWITCH(message.h.resource.component[0])
CASE(OGS_SBI_RESOURCE_NAME_NF_INSTANCES)
sbi_xact_id = OGS_POINTER_TO_UINT(e->h.sbi.data);
ogs_assert(sbi_xact_id >= OGS_MIN_POOL_ID &&
sbi_xact_id <= OGS_MAX_POOL_ID);
sbi_xact = ogs_sbi_xact_find_by_id(sbi_xact_id);
if (!sbi_xact) {
/* CLIENT_WAIT timer could remove SBI transaction
* before receiving SBI message */
ogs_error("SBI transaction has already been removed [%d]",
sbi_xact_id);
break;
}
SWITCH(message.h.method)
CASE(OGS_SBI_HTTP_METHOD_GET)
if (message.res_status == OGS_SBI_HTTP_STATUS_OK)
bsf_nnrf_handle_nf_discover(sbi_xact, &message);
else
ogs_error("HTTP response error [%d]",
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;
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 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_sbi_self()->nf_instance->load = get_sess_load();
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;
case OGS_TIMER_SBI_CLIENT_WAIT:
/*
* ogs_pollset_poll() receives the time of the expiration
* of next timer as an argument. If this timeout is
* in very near future (1 millisecond), and if there are
* multiple events that need to be processed by ogs_pollset_poll(),
* these could take more than 1 millisecond for processing,
* resulting in the timer already passed the expiration.
*
* In case that another NF is under heavy load and responds
* to an SBI request with some delay of a few seconds,
* it can happen that ogs_pollset_poll() adds SBI responses
* to the event list for further processing,
* then ogs_timer_mgr_expire() is called which will add
* an additional event for timer expiration. When all events are
* processed one-by-one, the SBI xact would get deleted twice
* in a row, resulting in a crash.
*
* 1. ogs_pollset_poll()
* message was received and put into an event list,
* 2. ogs_timer_mgr_expire()
* add an additional event for timer expiration
* 3. message event is processed. (free SBI xact)
* 4. timer expiration event is processed. (double-free SBI xact)
*
* To avoid double-free SBI xact,
* we need to check ogs_sbi_xact_find_by_id()
*/
sbi_xact_id = OGS_POINTER_TO_UINT(e->h.sbi.data);
ogs_assert(sbi_xact_id >= OGS_MIN_POOL_ID &&
sbi_xact_id <= OGS_MAX_POOL_ID);
sbi_xact = ogs_sbi_xact_find_by_id(sbi_xact_id);
if (!sbi_xact) {
ogs_error("SBI transaction has already been removed [%d]",
sbi_xact_id);
break;
}
if (sbi_xact->assoc_stream_id >= OGS_MIN_POOL_ID &&
sbi_xact->assoc_stream_id <= OGS_MAX_POOL_ID)
stream = ogs_sbi_stream_find_by_id(sbi_xact->assoc_stream_id);
/* Here, we should not use ogs_assert(stream)
* since 'namf-comm' service has no an associated stream. */
ogs_sbi_xact_remove(sbi_xact);
ogs_error("Cannot receive SBI message");
if (stream) {
ogs_assert(true ==
ogs_sbi_server_send_error(stream,
OGS_SBI_HTTP_STATUS_GATEWAY_TIMEOUT, NULL,
"Cannot receive SBI message", NULL, NULL));
}
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", bsf_event_get_name(e));
break;
}
}
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