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open5gs/src/amf/nsmf-handler.c

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/*
* Copyright (C) 2019 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 "nsmf-handler.h"
#include "nas-path.h"
#include "ngap-path.h"
#include "sbi-path.h"
#include "gmm-build.h"
int amf_nsmf_pdu_session_handle_create_sm_context(
amf_sess_t *sess, ogs_sbi_message_t *recvmsg)
{
int rv;
ogs_assert(sess);
ogs_assert(recvmsg);
if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_CREATED) {
ogs_sbi_message_t message;
ogs_sbi_header_t header;
if (!recvmsg->http.location) {
ogs_error("[%d:%d] No http.location", sess->psi, sess->pti);
nas_5gs_send_back_5gsm_message_from_sbi(sess,
OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR);
return OGS_ERROR;
}
memset(&header, 0, sizeof(header));
header.uri = recvmsg->http.location;
rv = ogs_sbi_parse_header(&message, &header);
if (rv != OGS_OK) {
ogs_error("[%d:%d] Cannot parse http.location [%s]",
sess->psi, sess->pti, recvmsg->http.location);
nas_5gs_send_back_5gsm_message_from_sbi(sess,
OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR);
return OGS_ERROR;
}
if (!message.h.resource.component[1]) {
ogs_error("[%d:%d] No SmContextRef [%s]",
sess->psi, sess->pti, recvmsg->http.location);
ogs_sbi_header_free(&header);
nas_5gs_send_back_5gsm_message_from_sbi(sess,
OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR);
return OGS_ERROR;
}
if (sess->pdu_session_establishment_accept) {
/*
* [1-SERVER] /namf-comm/v1/ue-contexts/{supi}/n1-n2-messages
* [2-CLIENT] /nsmf-pdusession/v1/sm-contexts
*
* If [1-SERVER] arrives before [2-CLIENT],
* there is no sm-context-ref. The PDU session establishment accept
* stored in [1-SERVER] is now trasnmitted to gNB.
*/
amf_ue_t *amf_ue = sess->amf_ue;
ogs_assert(amf_ue);
rv = nas_5gs_send_to_gnb(amf_ue,
sess->pdu_session_establishment_accept);
sess->pdu_session_establishment_accept = NULL;
if (rv != OGS_OK) {
ogs_error("[%d:%d] nas_5gs_send_to_gnb() failed",
sess->psi, sess->pti);
ogs_sbi_header_free(&header);
nas_5gs_send_back_5gsm_message_from_sbi(sess,
OGS_SBI_HTTP_STATUS_INTERNAL_SERVER_ERROR);
return OGS_ERROR;
}
}
if (sess->sm_context_ref)
ogs_free(sess->sm_context_ref);
sess->sm_context_ref = ogs_strdup(message.h.resource.component[1]);
/* Update UpCnxState */
sess->ueUpCnxState = OpenAPI_up_cnx_state_ACTIVATING;
sess->smfUpCnxState = OpenAPI_up_cnx_state_ACTIVATING;
ogs_sbi_header_free(&header);
} else {
OpenAPI_sm_context_create_error_t *SmContextCreateError = NULL;
OpenAPI_ref_to_binary_data_t *n1SmMsg = NULL;
ogs_pkbuf_t *n1smbuf = NULL;
SmContextCreateError = recvmsg->SmContextCreateError;
if (!SmContextCreateError) {
ogs_error("[%d:%d] No SmContextCreateError", sess->psi, sess->pti);
nas_5gs_send_back_5gsm_message_from_sbi(sess, recvmsg->res_status);
return OGS_ERROR;
}
if (!SmContextCreateError->error) {
ogs_error("[%d:%d] No Error", sess->psi, sess->pti);
nas_5gs_send_back_5gsm_message_from_sbi(sess, recvmsg->res_status);
return OGS_ERROR;
}
n1SmMsg = SmContextCreateError->n1_sm_msg;
if (n1SmMsg && n1SmMsg->content_id) {
n1smbuf = ogs_sbi_find_part_by_content_id(
recvmsg, n1SmMsg->content_id);
if (n1smbuf) {
/*
* NOTE : The pkbuf created in the SBI message will be removed
* from ogs_sbi_message_free(), so it must be copied.
*/
n1smbuf = ogs_pkbuf_copy(n1smbuf);
ogs_assert(n1smbuf);
nas_5gs_send_gsm_reject_from_sbi(sess,
OGS_NAS_PAYLOAD_CONTAINER_N1_SM_INFORMATION,
n1smbuf, recvmsg->res_status);
return OGS_ERROR;
}
}
nas_5gs_send_back_5gsm_message_from_sbi(sess, recvmsg->res_status);
return OGS_ERROR;
}
return OGS_OK;
}
int amf_nsmf_pdu_session_handle_update_sm_context(
amf_sess_t *sess, ogs_sbi_message_t *recvmsg)
{
amf_ue_t *amf_ue = NULL;
ogs_assert(sess);
amf_ue = sess->amf_ue;
ogs_assert(amf_ue);
ogs_assert(recvmsg);
if (recvmsg->res_status == OGS_SBI_HTTP_STATUS_NO_CONTENT ||
recvmsg->res_status == OGS_SBI_HTTP_STATUS_OK) {
OpenAPI_sm_context_updated_data_t *SmContextUpdatedData = NULL;
OpenAPI_ref_to_binary_data_t *n1SmMsg = NULL;
OpenAPI_ref_to_binary_data_t *n2SmInfo = NULL;
ogs_pkbuf_t *n1smbuf = NULL;
ogs_pkbuf_t *n2smbuf = NULL;
/* UPDATE_UpCnxState - SYNC */
sess->smfUpCnxState = sess->ueUpCnxState;
if (recvmsg->SmContextUpdatedData &&
recvmsg->SmContextUpdatedData->n2_sm_info) {
SmContextUpdatedData = recvmsg->SmContextUpdatedData;
ogs_assert(SmContextUpdatedData);
n2SmInfo = SmContextUpdatedData->n2_sm_info;
ogs_assert(n2SmInfo);
if (n2SmInfo->content_id) {
n2smbuf = ogs_sbi_find_part_by_content_id(
recvmsg, n2SmInfo->content_id);
}
n1SmMsg = SmContextUpdatedData->n1_sm_msg;
if (n1SmMsg && n1SmMsg->content_id) {
n1smbuf = ogs_sbi_find_part_by_content_id(
recvmsg, n1SmMsg->content_id);
}
switch (SmContextUpdatedData->n2_sm_info_type) {
case OpenAPI_n2_sm_info_type_PDU_RES_SETUP_REQ:
if (!n2smbuf) {
ogs_error("[%s:%d] No N2 SM Content",
amf_ue->supi, sess->psi);
nas_5gs_send_gmm_reject(amf_ue,
OGS_5GMM_CAUSE_5GS_SERVICES_NOT_ALLOWED);
return OGS_ERROR;
}
/*
* To Deliver N2 SM Content to gNB Temporarily,
* Store N2 SM Context in Session Context
*/
if (sess->n2smbuf) {
/*
* It should not be reached this way.
* If the problem occurred, free the old n2smbuf
*/
ogs_error("[%s:%d] N2 SM Content is duplicated",
amf_ue->supi, sess->psi);
ogs_pkbuf_free(sess->n2smbuf);
}
/*
* NOTE : The pkbuf created in the SBI message will be removed
* from ogs_sbi_message_free().
* So it must be copied and push a event queue.
*/
sess->n2smbuf = ogs_pkbuf_copy(n2smbuf);
ogs_assert(sess->n2smbuf);
if (SESSION_SYNC_DONE(amf_ue)) {
nas_5gs_send_accept(amf_ue);
/*
* After sending accept message, N2 SM context is freed
* For checking memory, NULL pointer should be set to n2smbuf.
*/
ogs_list_for_each(&amf_ue->sess_list, sess) {
if (sess->n2smbuf) {
ogs_pkbuf_free(sess->n2smbuf);
sess->n2smbuf = NULL;
}
}
}
break;
case OpenAPI_n2_sm_info_type_PDU_RES_REL_CMD:
if (!n1smbuf) {
ogs_error("[%s:%d] No N1 SM Content [%s]",
amf_ue->supi, sess->psi, n1SmMsg->content_id);
nas_5gs_send_back_5gsm_message(sess,
OGS_5GSM_CAUSE_SEMANTICALLY_INCORRECT_MESSAGE);
return OGS_ERROR;
}
/*
* NOTE : The pkbuf created in the SBI message will be removed
* from ogs_sbi_message_free(), so it must be copied.
*/
n1smbuf = ogs_pkbuf_copy(n1smbuf);
ogs_assert(n1smbuf);
n2smbuf = ogs_pkbuf_copy(n2smbuf);
ogs_assert(n2smbuf);
nas_send_pdu_session_release_command(sess, n1smbuf, n2smbuf);
break;
default:
ogs_error("Not implemented [%d]",
SmContextUpdatedData->n2_sm_info_type);
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
}
} else {
if (!SESSION_CONTEXT_IN_SMF(sess)) {
/*
* 1. PDU session release complete
* CLEAR_SM_CONTEXT_REF(sess) in gmm-handler.c
* 2. /nsmf-pdusession/v1/sm-contexts/{smContextRef}/modify
*
* If resource-status has already been updated by
* notify(/namf-callback/v1/{supi}/sm-context-status/{psi})
* Remove 'amf_sess_t' context to call
* amf_nsmf_pdu_session_handle_release_sm_context().
*/
ogs_debug("[%s:%d] Receive Update SM context",
amf_ue->supi, sess->psi);
if (sess->resource_status == OpenAPI_resource_status_RELEASED) {
ogs_debug("[%s:%d] SM context remove",
amf_ue->supi, sess->psi);
amf_nsmf_pdu_session_handle_release_sm_context(sess);
}
} else if (sess->ueUpCnxState == OpenAPI_up_cnx_state_ACTIVATED) {
/*
* 1. PDUSessionResourceSetupResponse
* 2. /nsmf-pdusession/v1/sm-contexts/{smContextRef}/modify
* 3. PFCP Session Modifcation Request (OuterHeaderCreation)
* 4. PFCP Session Modifcation Response
*/
/*
* 1. InitialContextSetupResponse
* 2. /nsmf-pdusession/v1/sm-contexts/{smContextRef}/modify
* 3. PFCP Session Modifcation Request (Apply: FORWARD)
* 4. PFCP Session Modifcation Response
*/
/*
* 1. PDUSessionResourceReleaseResponse
* 2. /nsmf-pdusession/v1/sm-contexts/{smContextRef}/modify
*/
/* Nothing */
} else if (sess->ueUpCnxState == OpenAPI_up_cnx_state_DEACTIVATED) {
/*
* 1. UEContextReleaseRequest
* 2. /nsmf-pdusession/v1/sm-contexts/{smContextRef}/modify
* 3. PFCP Session Modifcation Request (Apply:Buff & NOCP)
* 4. PFCP Session Modifcation Response
* 5. UEContextReleaseCommand
* 6. UEContextReleaseComplete
*/
if (SESSION_SYNC_DONE(amf_ue)) {
ngap_send_amf_ue_context_release_command(amf_ue,
NGAP_Cause_PR_nas, NGAP_CauseNas_normal_release,
NGAP_UE_CTX_REL_NG_CONTEXT_REMOVE, 0);
}
} else if (sess->ueUpCnxState == OpenAPI_up_cnx_state_ACTIVATING) {
/* Not reached here */
} else {
ogs_error("Invalid UpCnxState [UE:%d,SMF:%d]",
sess->ueUpCnxState, sess->smfUpCnxState);
}
}
} else {
amf_ue_t *amf_ue = NULL;
OpenAPI_sm_context_update_error_t *SmContextUpdateError = NULL;
OpenAPI_ref_to_binary_data_t *n1SmMsg = NULL;
ogs_pkbuf_t *n1smbuf = NULL;
#if 0 /* Is it needed? */
OpenAPI_ref_to_binary_data_t *n2SmInfo = NULL;
ogs_pkbuf_t *n2smbuf = NULL;
#endif
amf_ue = sess->amf_ue;
ogs_assert(amf_ue);
SmContextUpdateError = recvmsg->SmContextUpdateError;
if (!SmContextUpdateError) {
ogs_error("[%d:%d] No SmContextUpdateError", sess->psi, sess->pti);
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
return OGS_ERROR;
}
if (!SmContextUpdateError->error) {
ogs_error("[%d:%d] No Error", sess->psi, sess->pti);
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
return OGS_ERROR;
}
n1SmMsg = SmContextUpdateError->n1_sm_msg;
if (n1SmMsg && n1SmMsg->content_id) {
n1smbuf = ogs_sbi_find_part_by_content_id(
recvmsg, n1SmMsg->content_id);
if (n1smbuf) {
/*
* NOTE : The pkbuf created in the SBI message will be removed
* from ogs_sbi_message_free(), so it must be copied.
*/
n1smbuf = ogs_pkbuf_copy(n1smbuf);
ogs_assert(n1smbuf);
nas_5gs_send_gsm_reject_from_sbi(sess,
OGS_NAS_PAYLOAD_CONTAINER_N1_SM_INFORMATION,
n1smbuf, recvmsg->res_status);
return OGS_ERROR;
}
}
#if 0 /* Is it needed? */
n2SmInfo = SmContextUpdateError->n2_sm_info;
if (!n2SmInfo || !n2SmInfo->content_id) {
ogs_error("[%d:%d] No N2 SM Message", sess->psi, sess->pti);
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
return OGS_ERROR;
}
n2smbuf = ogs_sbi_find_part_by_content_id(
recvmsg, n2SmInfo->content_id);
if (!n2smbuf) {
ogs_error("[%d:%d] No N2 SM Content [%s]",
sess->psi, sess->pti, n2SmInfo->content_id);
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
return OGS_ERROR;
}
#endif
ngap_send_error_indication2(amf_ue,
NGAP_Cause_PR_protocol, NGAP_CauseProtocol_semantic_error);
return OGS_ERROR;
}
return OGS_OK;
}
int amf_nsmf_pdu_session_handle_release_sm_context(amf_sess_t *sess)
{
amf_ue_t *amf_ue = NULL;
ogs_assert(sess);
amf_ue = sess->amf_ue;
ogs_assert(amf_ue);
/* Check last session */
if (ogs_list_count(&amf_ue->sess_list) == 1) {
if (OGS_FSM_CHECK(&amf_ue->sm, gmm_state_authentication)) {
amf_ue_sbi_discover_and_send(OpenAPI_nf_type_AUSF, amf_ue, NULL,
amf_nausf_auth_build_authenticate);
} else if (OGS_FSM_CHECK(&amf_ue->sm, gmm_state_de_registered)) {
nas_5gs_send_de_registration_accept(amf_ue);
} else if (OGS_FSM_CHECK(&amf_ue->sm,
gmm_state_initial_context_setup)) {
/*
* 1. Initial context setup failure
* 2. Release All SM contexts
* 3. UE Context release command
* 4. UE Context release complete
*/
ngap_send_amf_ue_context_release_command(amf_ue,
NGAP_Cause_PR_nas, NGAP_CauseNas_normal_release,
NGAP_UE_CTX_REL_NG_CONTEXT_REMOVE, 0);
} else if (OGS_FSM_CHECK(&amf_ue->sm, gmm_state_exception)) {
/*
* 1. GMM Exception
* 2. Release All SM contexts
* 3. UE Context release command
* 4. UE Context release complete
*/
ngap_send_amf_ue_context_release_command(amf_ue,
NGAP_Cause_PR_nas, NGAP_CauseNas_normal_release,
NGAP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0);
} else if (OGS_FSM_CHECK(&amf_ue->sm, gmm_state_registered)) {
ogs_debug("Release SM Context in registered STATE");
} else if (OGS_FSM_CHECK(&amf_ue->sm, gmm_state_security_mode)) {
ogs_error("Release SM Context in security-mode STATE");
} else {
ogs_error("Release SM Context : INVALID STATE");
}
}
amf_sess_remove(sess);
return OGS_OK;
}
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