forked from acouzens/open5gs
422 lines
15 KiB
C
422 lines
15 KiB
C
/*
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* Copyright (C) 2023 by Sukchan Lee <acetcom@gmail.com>
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*
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* This file is part of Open5GS.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "sbi-path.h"
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void sepp_state_initial(ogs_fsm_t *s, sepp_event_t *e)
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{
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sepp_sm_debug(e);
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ogs_assert(s);
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OGS_FSM_TRAN(s, &sepp_state_operational);
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}
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void sepp_state_final(ogs_fsm_t *s, sepp_event_t *e)
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{
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sepp_sm_debug(e);
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ogs_assert(s);
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}
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void sepp_state_operational(ogs_fsm_t *s, sepp_event_t *e)
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{
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int rv;
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sepp_node_t *sepp_node = NULL;
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ogs_sbi_stream_t *stream = NULL;
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ogs_sbi_request_t *request = NULL;
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ogs_sbi_server_t *server = NULL;
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ogs_sbi_nf_instance_t *nf_instance = NULL;
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ogs_sbi_subscription_data_t *subscription_data = NULL;
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ogs_sbi_response_t *response = NULL;
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ogs_sbi_message_t message;
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sepp_sm_debug(e);
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ogs_assert(s);
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switch (e->h.id) {
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case OGS_FSM_ENTRY_SIG:
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break;
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case OGS_FSM_EXIT_SIG:
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break;
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case OGS_EVENT_SBI_SERVER:
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request = e->h.sbi.request;
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ogs_assert(request);
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stream = e->h.sbi.data;
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ogs_assert(stream);
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server = ogs_sbi_server_from_stream(stream);
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ogs_assert(server);
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rv = ogs_sbi_parse_request(&message, request);
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if (rv != OGS_OK) {
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/* 'sbi_message' buffer is released in ogs_sbi_parse_request() */
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ogs_error("cannot parse HTTP sbi_message");
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ogs_assert(true ==
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ogs_sbi_server_send_error(
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stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
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NULL, "cannot parse HTTP sbi_message", NULL, NULL));
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break;
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}
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if (strcmp(message.h.api.version, OGS_SBI_API_V1) != 0) {
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ogs_error("Not supported version [%s]", message.h.api.version);
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ogs_assert(true ==
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ogs_sbi_server_send_error(
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stream, OGS_SBI_HTTP_STATUS_BAD_REQUEST,
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&message, "Not supported version", NULL, NULL));
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ogs_sbi_message_free(&message);
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break;
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}
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SWITCH(message.h.service.name)
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CASE(OGS_SBI_SERVICE_NAME_NNRF_NFM)
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if (server->interface &&
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strcmp(server->interface, OGS_SBI_INTERFACE_NAME_SEPP) == 0) {
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ogs_error("[DROP] Peer SEPP is using the wrong interface[%s]",
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server->interface);
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break;
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}
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SWITCH(message.h.resource.component[0])
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CASE(OGS_SBI_RESOURCE_NAME_NF_STATUS_NOTIFY)
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SWITCH(message.h.method)
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CASE(OGS_SBI_HTTP_METHOD_POST)
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ogs_nnrf_nfm_handle_nf_status_notify(stream, &message);
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break;
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DEFAULT
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ogs_error("Invalid HTTP method [%s]", message.h.method);
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ogs_assert(true ==
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ogs_sbi_server_send_error(stream,
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OGS_SBI_HTTP_STATUS_FORBIDDEN, &message,
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"Invalid HTTP method", message.h.method, NULL));
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END
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break;
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DEFAULT
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ogs_error("Invalid resource name [%s]",
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message.h.resource.component[0]);
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ogs_assert(true ==
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ogs_sbi_server_send_error(stream,
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OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
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"Invalid resource name",
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message.h.resource.component[0], NULL));
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END
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break;
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CASE(OGS_SBI_SERVICE_NAME_N32C_HANDSHAKE)
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if (!server->interface &&
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ogs_sbi_server_first_by_interface(
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OGS_SBI_INTERFACE_NAME_SEPP)) {
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ogs_error("[DROP] Peer SEPP is using the wrong interface[sbi]");
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break;
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}
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SWITCH(message.h.resource.component[0])
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CASE(OGS_SBI_RESOURCE_NAME_EXCHANGE_CAPABILITY)
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SWITCH(message.h.method)
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CASE(OGS_SBI_HTTP_METHOD_POST)
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if (message.SecNegotiateReqData &&
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message.SecNegotiateReqData->sender) {
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sepp_node = sepp_node_find_by_receiver(
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message.SecNegotiateReqData->sender);
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if (!sepp_node) {
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sepp_node = sepp_node_add(
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message.SecNegotiateReqData->sender);
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ogs_assert(sepp_node);
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sepp_handshake_fsm_init(sepp_node, false);
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}
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}
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break;
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DEFAULT
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ogs_error("Invalid HTTP method [%s]", message.h.method);
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ogs_assert(true ==
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ogs_sbi_server_send_error(stream,
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OGS_SBI_HTTP_STATUS_FORBIDDEN, &message,
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"Invalid HTTP method", message.h.method, NULL));
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END
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break;
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DEFAULT
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ogs_error("Invalid resource name [%s]",
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message.h.resource.component[0]);
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ogs_assert(true ==
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ogs_sbi_server_send_error(stream,
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OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
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"Invalid resource name",
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message.h.resource.component[0], NULL));
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END
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if (!sepp_node) {
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ogs_error("Not found [%s]", message.h.method);
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ogs_assert(true ==
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ogs_sbi_server_send_error(
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stream, OGS_SBI_HTTP_STATUS_NOT_FOUND,
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&message, "Not found", message.h.method, NULL));
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break;
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}
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ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
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e->sepp_node = sepp_node;
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e->h.sbi.message = &message;
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ogs_fsm_dispatch(&sepp_node->sm, e);
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if (OGS_FSM_CHECK(&sepp_node->sm, sepp_handshake_state_exception))
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ogs_error("[%s] State machine exception", sepp_node->receiver);
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break;
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DEFAULT
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ogs_error("Invalid API name [%s]", message.h.service.name);
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ogs_assert(true ==
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ogs_sbi_server_send_error(stream,
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OGS_SBI_HTTP_STATUS_BAD_REQUEST, &message,
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"Invalid API name", message.h.service.name, NULL));
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END
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/* In lib/sbi/server.c, notify_completed() releases 'request' buffer. */
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ogs_sbi_message_free(&message);
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break;
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case OGS_EVENT_SBI_CLIENT:
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ogs_assert(e);
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response = e->h.sbi.response;
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ogs_assert(response);
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rv = ogs_sbi_parse_response(&message, response);
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if (rv != OGS_OK) {
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ogs_error("cannot parse HTTP response");
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ogs_sbi_message_free(&message);
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ogs_sbi_response_free(response);
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break;
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}
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if (strcmp(message.h.api.version, OGS_SBI_API_V1) != 0) {
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ogs_error("Not supported version [%s]", message.h.api.version);
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ogs_sbi_message_free(&message);
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ogs_sbi_response_free(response);
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break;
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}
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SWITCH(message.h.service.name)
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CASE(OGS_SBI_SERVICE_NAME_NNRF_NFM)
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SWITCH(message.h.resource.component[0])
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CASE(OGS_SBI_RESOURCE_NAME_NF_INSTANCES)
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ogs_fsm_handler_t old_state;
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nf_instance = e->h.sbi.data;
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ogs_assert(nf_instance);
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old_state = OGS_FSM_STATE(&nf_instance->sm);
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ogs_assert(old_state);
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e->h.sbi.message = &message;
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ogs_fsm_dispatch(&nf_instance->sm, e);
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/*
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* The SEPP on the H-PLMN should send a n32c-handshake message
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* with the Sender PLMN-ID. Otherwise, the UE in the V-PLMN cannot
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* find the SEPP in the H-PLMN during the REGISTRATION.
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*
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* Since SEPP's PLMN-ID can be received when registering with NRF,
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* n32c-handshake messages could be started after that.
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*
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* To confirm that the PLMN-ID has been received from the NRF,
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* we check if the NF state has changed from
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* ogs_sbi_nf_state_will_register to ogs_sbi_nf_state_registered.
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*/
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if (old_state ==
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(ogs_fsm_handler_t)ogs_sbi_nf_state_will_register &&
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OGS_FSM_CHECK(&nf_instance->sm,
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ogs_sbi_nf_state_registered)) {
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/* Initialize SEPP Peer List */
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ogs_list_for_each(&sepp_self()->peer_list, sepp_node) {
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/*
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* Since FSM initialization only needs to be done once
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* at the beginning, it only performs initialization
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* when the state variable(OGS_FSM_STATE()) is NULL.
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*/
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if (!OGS_FSM_STATE(&sepp_node->sm))
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sepp_handshake_fsm_init(sepp_node, true);
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}
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}
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break;
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CASE(OGS_SBI_RESOURCE_NAME_SUBSCRIPTIONS)
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subscription_data = e->h.sbi.data;
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ogs_assert(subscription_data);
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SWITCH(message.h.method)
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CASE(OGS_SBI_HTTP_METHOD_POST)
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if (message.res_status == OGS_SBI_HTTP_STATUS_CREATED ||
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message.res_status == OGS_SBI_HTTP_STATUS_OK) {
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ogs_nnrf_nfm_handle_nf_status_subscribe(
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subscription_data, &message);
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} else {
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ogs_error("HTTP response error : %d",
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message.res_status);
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}
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break;
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CASE(OGS_SBI_HTTP_METHOD_PATCH)
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if (message.res_status == OGS_SBI_HTTP_STATUS_OK ||
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message.res_status == OGS_SBI_HTTP_STATUS_NO_CONTENT) {
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ogs_nnrf_nfm_handle_nf_status_update(
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subscription_data, &message);
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} else {
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ogs_error("[%s] HTTP response error [%d]",
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subscription_data->id ?
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subscription_data->id : "Unknown",
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message.res_status);
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}
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break;
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CASE(OGS_SBI_HTTP_METHOD_DELETE)
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if (message.res_status == OGS_SBI_HTTP_STATUS_NO_CONTENT) {
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ogs_sbi_subscription_data_remove(subscription_data);
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} else {
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ogs_error("[%s] HTTP response error [%d]",
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subscription_data->id ?
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subscription_data->id : "Unknown",
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message.res_status);
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}
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break;
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DEFAULT
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ogs_error("Invalid HTTP method [%s]", message.h.method);
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ogs_assert_if_reached();
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END
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break;
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DEFAULT
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ogs_error("Invalid resource name [%s]",
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message.h.resource.component[0]);
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ogs_assert_if_reached();
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END
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break;
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CASE(OGS_SBI_SERVICE_NAME_N32C_HANDSHAKE)
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SWITCH(message.h.resource.component[0])
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CASE(OGS_SBI_RESOURCE_NAME_EXCHANGE_CAPABILITY)
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sepp_node = e->h.sbi.data;
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ogs_assert(sepp_node);
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ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
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e->sepp_node = sepp_node;
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e->h.sbi.message = &message;
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ogs_fsm_dispatch(&sepp_node->sm, e);
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break;
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DEFAULT
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ogs_error("Invalid resource name [%s]",
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message.h.resource.component[0]);
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ogs_assert_if_reached();
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END
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break;
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DEFAULT
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ogs_error("Invalid service name [%s]", message.h.service.name);
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ogs_assert_if_reached();
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END
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ogs_sbi_message_free(&message);
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ogs_sbi_response_free(response);
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break;
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case OGS_EVENT_SBI_TIMER:
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ogs_assert(e);
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switch(e->h.timer_id) {
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case SEPP_TIMER_PEER_ESTABLISH:
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sepp_node = e->sepp_node;
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ogs_assert(sepp_node);
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ogs_assert(OGS_FSM_STATE(&sepp_node->sm));
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ogs_fsm_dispatch(&sepp_node->sm, e);
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if (OGS_FSM_CHECK(&sepp_node->sm, sepp_handshake_state_exception))
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ogs_error("[%s] State machine exception [%d]",
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sepp_node->receiver, e->h.timer_id);
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break;
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case OGS_TIMER_NF_INSTANCE_REGISTRATION_INTERVAL:
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case OGS_TIMER_NF_INSTANCE_HEARTBEAT_INTERVAL:
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case OGS_TIMER_NF_INSTANCE_NO_HEARTBEAT:
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case OGS_TIMER_NF_INSTANCE_VALIDITY:
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nf_instance = e->h.sbi.data;
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ogs_assert(nf_instance);
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ogs_assert(OGS_FSM_STATE(&nf_instance->sm));
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ogs_fsm_dispatch(&nf_instance->sm, e);
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if (OGS_FSM_CHECK(&nf_instance->sm, ogs_sbi_nf_state_exception))
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ogs_error("[%s:%s] State machine exception [%d]",
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OpenAPI_nf_type_ToString(nf_instance->nf_type),
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nf_instance->id, e->h.timer_id);
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break;
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case OGS_TIMER_SUBSCRIPTION_VALIDITY:
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subscription_data = e->h.sbi.data;
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ogs_assert(subscription_data);
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ogs_assert(true ==
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ogs_nnrf_nfm_send_nf_status_subscribe(
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ogs_sbi_self()->nf_instance->nf_type,
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subscription_data->req_nf_instance_id,
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subscription_data->subscr_cond.nf_type,
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subscription_data->subscr_cond.service_name));
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ogs_error("[%s] Subscription validity expired",
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subscription_data->id);
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ogs_sbi_subscription_data_remove(subscription_data);
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break;
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case OGS_TIMER_SUBSCRIPTION_PATCH:
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subscription_data = e->h.sbi.data;
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ogs_assert(subscription_data);
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ogs_assert(true ==
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ogs_nnrf_nfm_send_nf_status_update(subscription_data));
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ogs_info("[%s] Need to update Subscription",
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subscription_data->id);
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break;
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default:
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ogs_error("Unknown timer[%s:%d]",
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ogs_timer_get_name(e->h.timer_id), e->h.timer_id);
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}
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break;
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default:
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ogs_error("No handler for event %s", sepp_event_get_name(e));
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break;
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}
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}
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