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open5gs/src/sgwu/sxa-handler.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 "pfcp-path.h"
#include "gtp-path.h"
#include "sxa-handler.h"
void sgwu_sxa_handle_session_establishment_request(
sgwu_sess_t *sess, ogs_pfcp_xact_t *xact,
ogs_pfcp_session_establishment_request_t *req)
{
ogs_pfcp_pdr_t *pdr = NULL;
ogs_pfcp_far_t *far = NULL;
ogs_pfcp_pdr_t *created_pdr[OGS_MAX_NUM_OF_PDR];
int num_of_created_pdr = 0;
uint8_t cause_value = 0;
uint8_t offending_ie_value = 0;
int i;
ogs_pfcp_sereq_flags_t sereq_flags;
bool restoration_indication = false;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Session Establishment Request");
cause_value = OGS_PFCP_CAUSE_REQUEST_ACCEPTED;
if (!sess) {
ogs_error("No Context");
ogs_pfcp_send_error_message(xact,
OGS_PFCP_SEID_NO_PRESENCE, 0,
OGS_PFCP_SESSION_ESTABLISHMENT_RESPONSE_TYPE,
OGS_PFCP_CAUSE_MANDATORY_IE_MISSING, 0);
return;
}
/* PFCPSEReq-Flags */
memset(&sereq_flags, 0, sizeof(sereq_flags));
if (req->pfcpsereq_flags.presence == 1) {
sereq_flags.value = req->pfcpsereq_flags.u8;
}
for (i = 0; i < OGS_MAX_NUM_OF_PDR; i++) {
created_pdr[i] = ogs_pfcp_handle_create_pdr(&sess->pfcp,
&req->create_pdr[i], &sereq_flags,
&cause_value, &offending_ie_value);
if (created_pdr[i] == NULL)
break;
}
num_of_created_pdr = i;
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_FAR; i++) {
if (ogs_pfcp_handle_create_far(&sess->pfcp, &req->create_far[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_QER; i++) {
if (ogs_pfcp_handle_create_qer(&sess->pfcp, &req->create_qer[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
ogs_pfcp_handle_create_bar(&sess->pfcp, &req->create_bar,
&cause_value, &offending_ie_value);
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
/* PFCPSEReq-Flags */
if (sereq_flags.restoration_indication == 1) {
for (i = 0; i < num_of_created_pdr; i++) {
pdr = created_pdr[i];
ogs_assert(pdr);
if (pdr->f_teid_len)
ogs_pfcp_pdr_swap_teid(pdr);
}
restoration_indication = true;
}
/* Setup GTP Node */
ogs_list_for_each(&sess->pfcp.far_list, far) {
if (OGS_ERROR == ogs_pfcp_setup_far_gtpu_node(far)) {
ogs_fatal("CHECK CONFIGURATION: sgwu.gtpu");
ogs_fatal("ogs_pfcp_setup_far_gtpu_node() failed");
goto cleanup;
}
if (far->gnode)
ogs_pfcp_far_f_teid_hash_set(far);
}
for (i = 0; i < num_of_created_pdr; i++) {
pdr = created_pdr[i];
ogs_assert(pdr);
/* Setup TEID Hash */
if (pdr->f_teid_len)
ogs_pfcp_object_teid_hash_set(
OGS_PFCP_OBJ_PDR_TYPE, pdr, restoration_indication);
}
/* Send Buffered Packet to gNB */
ogs_list_for_each(&sess->pfcp.pdr_list, pdr) {
if (pdr->src_if == OGS_PFCP_INTERFACE_CORE) { /* Downlink */
ogs_pfcp_send_buffered_packet(pdr);
}
}
if (restoration_indication == true ||
ogs_pfcp_self()->up_function_features.ftup == 0)
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_establishment_response(
xact, sess, NULL, 0));
else
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_establishment_response(
xact, sess, created_pdr, num_of_created_pdr));
return;
cleanup:
ogs_pfcp_sess_clear(&sess->pfcp);
ogs_pfcp_send_error_message(xact,
sess ? OGS_PFCP_SEID_PRESENCE : OGS_PFCP_SEID_NO_PRESENCE,
sess ? sess->sgwu_sxa_seid : 0,
OGS_PFCP_SESSION_ESTABLISHMENT_RESPONSE_TYPE,
cause_value, offending_ie_value);
}
void sgwu_sxa_handle_session_modification_request(
sgwu_sess_t *sess, ogs_pfcp_xact_t *xact,
ogs_pfcp_session_modification_request_t *req)
{
ogs_pfcp_pdr_t *pdr = NULL;
ogs_pfcp_far_t *far = NULL;
ogs_pfcp_pdr_t *created_pdr[OGS_MAX_NUM_OF_PDR];
int num_of_created_pdr = 0;
uint8_t cause_value = 0;
uint8_t offending_ie_value = 0;
int i;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Session Modification Request");
cause_value = OGS_PFCP_CAUSE_REQUEST_ACCEPTED;
if (!sess) {
ogs_error("No Context");
ogs_pfcp_send_error_message(xact,
OGS_PFCP_SEID_NO_PRESENCE, 0,
OGS_PFCP_SESSION_MODIFICATION_RESPONSE_TYPE,
OGS_PFCP_CAUSE_SESSION_CONTEXT_NOT_FOUND, 0);
return;
}
for (i = 0; i < OGS_MAX_NUM_OF_PDR; i++) {
created_pdr[i] = ogs_pfcp_handle_create_pdr(&sess->pfcp,
&req->create_pdr[i], NULL, &cause_value, &offending_ie_value);
if (created_pdr[i] == NULL)
break;
}
num_of_created_pdr = i;
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_PDR; i++) {
if (ogs_pfcp_handle_remove_pdr(&sess->pfcp, &req->remove_pdr[i],
&cause_value, &offending_ie_value) == false)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_FAR; i++) {
if (ogs_pfcp_handle_create_far(&sess->pfcp, &req->create_far[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_FAR; i++) {
if (ogs_pfcp_handle_update_far_flags(&sess->pfcp, &req->update_far[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
/* Send End Marker to gNB */
ogs_list_for_each(&sess->pfcp.pdr_list, pdr) {
if (pdr->src_if == OGS_PFCP_INTERFACE_CORE) { /* Downlink */
far = pdr->far;
if (far && far->smreq_flags.send_end_marker_packets)
ogs_assert(OGS_ERROR != ogs_pfcp_send_end_marker(pdr));
}
}
/* Clear PFCPSMReq-Flags */
ogs_list_for_each(&sess->pfcp.far_list, far)
far->smreq_flags.value = 0;
for (i = 0; i < OGS_MAX_NUM_OF_FAR; i++) {
if (ogs_pfcp_handle_update_far(&sess->pfcp, &req->update_far[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_FAR; i++) {
if (ogs_pfcp_handle_remove_far(&sess->pfcp, &req->remove_far[i],
&cause_value, &offending_ie_value) == false)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_QER; i++) {
if (ogs_pfcp_handle_create_qer(&sess->pfcp, &req->create_qer[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_QER; i++) {
if (ogs_pfcp_handle_update_qer(&sess->pfcp, &req->update_qer[i],
&cause_value, &offending_ie_value) == NULL)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
for (i = 0; i < OGS_MAX_NUM_OF_QER; i++) {
if (ogs_pfcp_handle_remove_qer(&sess->pfcp, &req->remove_qer[i],
&cause_value, &offending_ie_value) == false)
break;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
ogs_pfcp_handle_create_bar(&sess->pfcp, &req->create_bar,
&cause_value, &offending_ie_value);
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
ogs_pfcp_handle_remove_bar(&sess->pfcp, &req->remove_bar,
&cause_value, &offending_ie_value);
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED)
goto cleanup;
/* Setup GTP Node */
ogs_list_for_each(&sess->pfcp.far_list, far) {
if (OGS_ERROR == ogs_pfcp_setup_far_gtpu_node(far)) {
ogs_fatal("CHECK CONFIGURATION: sgwu.gtpu");
ogs_fatal("ogs_pfcp_setup_far_gtpu_node() failed");
goto cleanup;
}
if (far->gnode)
ogs_pfcp_far_f_teid_hash_set(far);
}
for (i = 0; i < num_of_created_pdr; i++) {
pdr = created_pdr[i];
ogs_assert(pdr);
/* Setup TEID Hash */
if (pdr->f_teid_len)
ogs_pfcp_object_teid_hash_set(OGS_PFCP_OBJ_PDR_TYPE, pdr, false);
}
/* Send Buffered Packet to gNB */
ogs_list_for_each(&sess->pfcp.pdr_list, pdr) {
if (pdr->src_if == OGS_PFCP_INTERFACE_CORE) { /* Downlink */
ogs_pfcp_send_buffered_packet(pdr);
}
}
if (ogs_pfcp_self()->up_function_features.ftup == 0)
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_modification_response(
xact, sess, NULL, 0));
else
ogs_assert(OGS_OK ==
sgwu_pfcp_send_session_modification_response(
xact, sess, created_pdr, num_of_created_pdr));
return;
cleanup:
ogs_pfcp_sess_clear(&sess->pfcp);
ogs_pfcp_send_error_message(xact,
sess ? OGS_PFCP_SEID_PRESENCE : OGS_PFCP_SEID_NO_PRESENCE,
sess ? sess->sgwu_sxa_seid : 0,
OGS_PFCP_SESSION_MODIFICATION_RESPONSE_TYPE,
cause_value, offending_ie_value);
}
void sgwu_sxa_handle_session_deletion_request(
sgwu_sess_t *sess, ogs_pfcp_xact_t *xact,
ogs_pfcp_session_deletion_request_t *req)
{
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Session Deletion Request");
if (!sess) {
ogs_error("No Context");
ogs_pfcp_send_error_message(xact,
OGS_PFCP_SEID_NO_PRESENCE, 0,
OGS_PFCP_SESSION_DELETION_RESPONSE_TYPE,
OGS_PFCP_CAUSE_SESSION_CONTEXT_NOT_FOUND, 0);
return;
}
ogs_assert(sess);
sgwu_pfcp_send_session_deletion_response(xact, sess);
sgwu_sess_remove(sess);
}
void sgwu_sxa_handle_session_report_response(
sgwu_sess_t *sess, ogs_pfcp_xact_t *xact,
ogs_pfcp_session_report_response_t *rsp)
{
uint8_t cause_value = 0;
ogs_assert(xact);
ogs_assert(rsp);
ogs_pfcp_xact_commit(xact);
ogs_debug("Session report resopnse");
cause_value = OGS_PFCP_CAUSE_REQUEST_ACCEPTED;
if (!sess) {
ogs_warn("No Context");
cause_value = OGS_PFCP_CAUSE_SESSION_CONTEXT_NOT_FOUND;
}
if (rsp->cause.presence) {
if (rsp->cause.u8 != OGS_PFCP_CAUSE_REQUEST_ACCEPTED) {
ogs_error("PFCP Cause[%d] : Not Accepted", rsp->cause.u8);
cause_value = rsp->cause.u8;
}
} else {
ogs_error("No Cause");
cause_value = OGS_PFCP_CAUSE_MANDATORY_IE_MISSING;
}
if (cause_value != OGS_PFCP_CAUSE_REQUEST_ACCEPTED) {
ogs_error("Cause request not accepted[%d]", cause_value);
return;
}
}
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