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open5gs/src/amf/ngap-path.c

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/*
* Copyright (C) 2019,2020 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 "ogs-sctp.h"
#include "context.h"
#include "ngap-build.h"
#include "ngap-path.h"
#include "nas-security.h"
#include "nas-path.h"
#include "sbi-path.h"
int ngap_open(void)
{
ogs_socknode_t *node = NULL;
ogs_list_for_each(&amf_self()->ngap_list, node)
if (ngap_server(node) == NULL) return OGS_ERROR;
ogs_list_for_each(&amf_self()->ngap_list6, node)
if (ngap_server(node) == NULL) return OGS_ERROR;
return OGS_OK;
}
void ngap_close(void)
{
ogs_socknode_remove_all(&amf_self()->ngap_list);
ogs_socknode_remove_all(&amf_self()->ngap_list6);
}
int ngap_send_to_gnb(amf_gnb_t *gnb, ogs_pkbuf_t *pkbuf, uint16_t stream_no)
{
char buf[OGS_ADDRSTRLEN];
ogs_assert(pkbuf);
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
ogs_pkbuf_free(pkbuf);
return OGS_NOTFOUND;
}
ogs_assert(gnb->sctp.sock);
if (gnb->sctp.sock->fd == INVALID_SOCKET) {
ogs_error("gNB SCTP socket has already been destroyed");
ogs_log_hexdump(OGS_LOG_FATAL, pkbuf->data, pkbuf->len);
ogs_pkbuf_free(pkbuf);
return OGS_ERROR;
}
ogs_debug(" IP[%s] RAN_ID[%d]",
OGS_ADDR(gnb->sctp.addr, buf), gnb->gnb_id);
ogs_sctp_ppid_in_pkbuf(pkbuf) = OGS_SCTP_NGAP_PPID;
ogs_sctp_stream_no_in_pkbuf(pkbuf) = stream_no;
if (gnb->sctp.type == SOCK_STREAM) {
ogs_sctp_write_to_buffer(&gnb->sctp, pkbuf);
return OGS_OK;
} else {
return ogs_sctp_senddata(gnb->sctp.sock, pkbuf, gnb->sctp.addr);
}
}
int ngap_send_to_ran_ue(ran_ue_t *ran_ue, ogs_pkbuf_t *pkbuf)
{
int rv;
ogs_assert(pkbuf);
if (!ran_ue_cycle(ran_ue)) {
ogs_error("NG context has already been removed");
ogs_pkbuf_free(pkbuf);
return OGS_NOTFOUND;
}
rv = ngap_send_to_gnb(ran_ue->gnb, pkbuf, ran_ue->gnb_ostream_id);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_delayed_send_to_ran_ue(
ran_ue_t *ran_ue, ogs_pkbuf_t *pkbuf, ogs_time_t duration)
{
ogs_assert(ran_ue);
ogs_assert(pkbuf);
if (duration) {
amf_event_t *e = NULL;
e = amf_event_new(AMF_EVENT_NGAP_TIMER);
ogs_assert(e);
e->timer = ogs_timer_add(
ogs_app()->timer_mgr, amf_timer_ng_delayed_send, e);
ogs_assert(e->timer);
e->pkbuf = pkbuf;
e->ran_ue = ran_ue;
e->gnb = ran_ue->gnb;
ogs_timer_start(e->timer, duration);
return OGS_OK;
} else {
int rv = ngap_send_to_ran_ue(ran_ue, pkbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
}
int ngap_send_to_5gsm(amf_ue_t *amf_ue, ogs_pkbuf_t *esmbuf)
{
int rv;
amf_event_t *e = NULL;
ogs_assert(amf_ue);
ogs_assert(esmbuf);
e = amf_event_new(AMF_EVENT_5GSM_MESSAGE);
ogs_assert(e);
e->amf_ue = amf_ue;
e->pkbuf = esmbuf;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ogs_queue_push() failed:%d", (int)rv);
ogs_pkbuf_free(e->pkbuf);
ogs_event_free(e);
}
return rv;
}
int ngap_send_to_nas(ran_ue_t *ran_ue,
NGAP_ProcedureCode_t procedureCode, NGAP_NAS_PDU_t *nasPdu)
{
int rv;
ogs_nas_5gs_security_header_t *sh = NULL;
ogs_nas_security_header_type_t security_header_type;
ogs_nas_5gmm_header_t *h = NULL;
ogs_pkbuf_t *nasbuf = NULL;
amf_event_t *e = NULL;
ogs_assert(ran_ue);
ogs_assert(nasPdu);
/* The Packet Buffer(pkbuf_t) for NAS message MUST make a HEADROOM.
* When calculating AES_CMAC, we need to use the headroom of the packet. */
nasbuf = ogs_pkbuf_alloc(NULL, OGS_NAS_HEADROOM+nasPdu->size);
ogs_assert(nasbuf);
ogs_pkbuf_reserve(nasbuf, OGS_NAS_HEADROOM);
ogs_pkbuf_put_data(nasbuf, nasPdu->buf, nasPdu->size);
sh = (ogs_nas_5gs_security_header_t *)nasbuf->data;
ogs_assert(sh);
memset(&security_header_type, 0, sizeof(ogs_nas_security_header_type_t));
switch(sh->security_header_type) {
case OGS_NAS_SECURITY_HEADER_PLAIN_NAS_MESSAGE:
break;
case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED:
security_header_type.integrity_protected = 1;
ogs_pkbuf_pull(nasbuf, 7);
break;
case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_CIPHERED:
security_header_type.integrity_protected = 1;
security_header_type.ciphered = 1;
ogs_pkbuf_pull(nasbuf, 7);
break;
case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_NEW_SECURITY_CONTEXT:
security_header_type.integrity_protected = 1;
security_header_type.new_security_context = 1;
ogs_pkbuf_pull(nasbuf, 7);
break;
case OGS_NAS_SECURITY_HEADER_INTEGRITY_PROTECTED_AND_CIPHTERD_WITH_NEW_INTEGRITY_CONTEXT:
security_header_type.integrity_protected = 1;
security_header_type.ciphered = 1;
security_header_type.new_security_context = 1;
ogs_pkbuf_pull(nasbuf, 7);
break;
default:
ogs_error("Not implemented(security header type:0x%x)",
sh->security_header_type);
return OGS_ERROR;
}
if (ran_ue->amf_ue) {
if (nas_5gs_security_decode(ran_ue->amf_ue,
security_header_type, nasbuf) != OGS_OK) {
ogs_error("nas_eps_security_decode failed()");
return OGS_ERROR;
}
}
h = (ogs_nas_5gmm_header_t *)nasbuf->data;
ogs_assert(h);
if (h->extended_protocol_discriminator ==
OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GMM) {
e = amf_event_new(AMF_EVENT_5GMM_MESSAGE);
if (!e) {
ogs_error("ngap_send_to_nas() failed");
ogs_pkbuf_free(nasbuf);
return OGS_ERROR;
}
e->ran_ue = ran_ue;
e->ngap.code = procedureCode;
e->nas.type = security_header_type.type;
e->pkbuf = nasbuf;
rv = ogs_queue_push(ogs_app()->queue, e);
if (rv != OGS_OK) {
ogs_error("ngap_send_to_nas() failed:%d", (int)rv);
ogs_pkbuf_free(e->pkbuf);
ogs_event_free(e);
}
return rv;
} else if (h->extended_protocol_discriminator ==
OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GSM) {
amf_ue_t *amf_ue = ran_ue->amf_ue;
if (!amf_ue) {
ogs_error("No UE Context");
ogs_pkbuf_free(nasbuf);
return OGS_ERROR;
}
rv = ngap_send_to_5gsm(amf_ue, nasbuf);
ogs_expect(rv == OGS_OK);
return rv;
} else {
ogs_error("Unknown NAS Protocol discriminator 0x%02x",
h->extended_protocol_discriminator);
ogs_pkbuf_free(nasbuf);
return OGS_ERROR;
}
}
int ngap_send_ng_setup_response(amf_gnb_t *gnb)
{
int rv;
ogs_pkbuf_t *ngap_buffer;
ogs_debug("NG-Setup response");
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngap_buffer = ngap_build_ng_setup_response();
if (!ngap_buffer) {
ogs_error("ngap_build_ng_setup_response() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngap_buffer, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_ng_setup_failure(
amf_gnb_t *gnb, NGAP_Cause_PR group, long cause)
{
int rv;
ogs_pkbuf_t *ngap_buffer;
ogs_debug("NG-Setup failure");
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngap_buffer = ngap_build_ng_setup_failure(
group, cause, NGAP_TimeToWait_v10s);
if (!ngap_buffer) {
ogs_error("ngap_build_ng_setup_failure() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngap_buffer, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_ran_configuration_update_ack(amf_gnb_t *gnb)
{
int rv;
ogs_pkbuf_t *ngap_buffer;
ogs_debug("RANConfigurationUpdateAcknowledge");
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngap_buffer = ngap_build_ran_configuration_update_ack();
if (!ngap_buffer) {
ogs_error("ngap_build_ran_configuration_update_ack() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngap_buffer, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_ran_configuration_update_failure(
amf_gnb_t *gnb, NGAP_Cause_PR group, long cause)
{
int rv;
ogs_pkbuf_t *ngap_buffer;
ogs_debug("RANConfigurationUpdateFailure");
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngap_buffer = ngap_build_ran_configuration_update_failure(
group, cause, NGAP_TimeToWait_v10s);
if (!ngap_buffer) {
ogs_error("ngap_build_ran_configuration_update_failure() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngap_buffer, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_ran_ue_context_release_command(
ran_ue_t *ran_ue, NGAP_Cause_PR group, long cause,
uint8_t action, ogs_time_t duration)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!ran_ue_cycle(ran_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_debug("UEContextReleaseCommand");
ogs_debug(" RAN_UE_NGAP_ID[%lld] AMF_UE_NGAP_ID[%lld]",
(long long)ran_ue->ran_ue_ngap_id,
(long long)ran_ue->amf_ue_ngap_id);
ogs_assert(action != NGAP_UE_CTX_REL_INVALID_ACTION);
ran_ue->ue_ctx_rel_action = action;
ogs_debug(" Group[%d] Cause[%d] Action[%d] Duration[%d]",
group, (int)cause, action, (int)duration);
ngapbuf = ngap_build_ue_context_release_command(ran_ue, group, cause);
if (!ngapbuf) {
ogs_error("ngap_build_ue_context_release_command() failed");
return OGS_ERROR;
}
rv = ngap_delayed_send_to_ran_ue(ran_ue, ngapbuf, duration);
ogs_expect(rv == OGS_OK);
ogs_timer_start(ran_ue->t_ng_holding,
amf_timer_cfg(AMF_TIMER_NG_HOLDING)->duration);
return rv;
}
int ngap_send_amf_ue_context_release_command(
amf_ue_t *amf_ue, NGAP_Cause_PR group, long cause,
uint8_t action, ogs_time_t duration)
{
int rv;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
rv = ngap_send_ran_ue_context_release_command(
amf_ue->ran_ue, group, cause, action, duration);
ogs_expect(rv == OGS_OK);
ogs_debug(" SUPI[%s]", amf_ue->supi);
return rv;
}
int ngap_send_paging(amf_ue_t *amf_ue)
{
ogs_pkbuf_t *ngapbuf = NULL;
amf_gnb_t *gnb = NULL;
int i, j;
int rv;
ogs_debug("NG-Paging");
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ogs_list_for_each(&amf_self()->gnb_list, gnb) {
for (i = 0; i < gnb->num_of_supported_ta_list; i++) {
for (j = 0; j < gnb->supported_ta_list[i].num_of_bplmn_list; j++) {
if (memcmp(&gnb->supported_ta_list[i].bplmn_list[j].plmn_id,
&amf_ue->nr_tai.plmn_id, OGS_PLMN_ID_LEN) == 0 &&
gnb->supported_ta_list[i].tac.v == amf_ue->nr_tai.tac.v) {
if (amf_ue->t3513.pkbuf) {
ngapbuf = amf_ue->t3513.pkbuf;
} else {
ngapbuf = ngap_build_paging(amf_ue);
if (!ngapbuf) {
ogs_error("ngap_build_paging() failed");
return OGS_ERROR;
}
}
amf_ue->t3513.pkbuf = ogs_pkbuf_copy(ngapbuf);
if (!amf_ue->t3513.pkbuf) {
ogs_error("ogs_pkbuf_copy() failed");
ogs_pkbuf_free(ngapbuf);
return OGS_ERROR;
}
amf_metrics_inst_global_inc(AMF_METR_GLOB_CTR_MM_PAGING_5G_REQ);
rv = ngap_send_to_gnb(gnb, ngapbuf, NGAP_NON_UE_SIGNALLING);
if (rv != OGS_OK) {
ogs_error("ngap_send_to_gnb() failed");
return rv;
}
}
}
}
}
/* Start T3513 */
ogs_timer_start(amf_ue->t3513.timer,
amf_timer_cfg(AMF_TIMER_T3513)->duration);
return OGS_OK;
}
int ngap_send_downlink_ran_configuration_transfer(
amf_gnb_t *target_gnb, NGAP_SONConfigurationTransfer_t *transfer)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_gnb_cycle(target_gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ogs_assert(transfer);
ngapbuf = ngap_build_downlink_ran_configuration_transfer(transfer);
if (!ngapbuf) {
ogs_error("ngap_build_downlink_ran_configuration_transfer() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(target_gnb, ngapbuf, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_path_switch_ack(amf_sess_t *sess)
{
int rv;
amf_ue_t *amf_ue = NULL;
ran_ue_t *ran_ue = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
ogs_assert(sess);
sess = amf_sess_cycle(sess);
if (!sess) {
ogs_error("Session has already been removed");
return OGS_NOTFOUND;
}
amf_ue = amf_ue_cycle(sess->amf_ue);
if (!amf_ue) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
ran_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!ran_ue) {
ogs_error("[%s] NG context has already been removed", amf_ue->supi);
return OGS_NOTFOUND;
}
ngapbuf = ngap_build_path_switch_ack(amf_ue);
if (!ngapbuf) {
ogs_error("ngap_build_path_switch_ack() failed");
return OGS_ERROR;
}
rv = nas_5gs_send_to_gnb(amf_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_handover_request(amf_ue_t *amf_ue)
{
int rv;
ran_ue_t *source_ue = NULL, *target_ue = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
source_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!source_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
target_ue = ran_ue_cycle(source_ue->target_ue);
if (!target_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ngapbuf = ngap_build_handover_request(target_ue);
if (!ngapbuf) {
ogs_error("ngap_build_handover_request() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(target_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_handover_preparation_failure(
ran_ue_t *source_ue, NGAP_Cause_t *cause)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!ran_ue_cycle(source_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_assert(cause);
ngapbuf = ngap_build_handover_preparation_failure(source_ue, cause);
if (!ngapbuf) {
ogs_error("ngap_build_handover_preparation_failure() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(source_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_handover_command(amf_ue_t *amf_ue)
{
int rv;
ran_ue_t *source_ue = NULL;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_ue_cycle(amf_ue)) {
ogs_error("UE(amf-ue) context has already been removed");
return OGS_NOTFOUND;
}
source_ue = ran_ue_cycle(amf_ue->ran_ue);
if (!source_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ngapbuf = ngap_build_handover_command(source_ue);
if (!ngapbuf) {
ogs_error("ngap_build_handover_command() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(source_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_handover_cancel_ack(ran_ue_t *source_ue)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!ran_ue_cycle(source_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ngapbuf = ngap_build_handover_cancel_ack(source_ue);
if (!ngapbuf) {
ogs_error("ngap_build_handover_cancel_ack() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(source_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_downlink_ran_status_transfer(
ran_ue_t *target_ue,
NGAP_RANStatusTransfer_TransparentContainer_t *transfer)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!ran_ue_cycle(target_ue)) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
ogs_assert(transfer);
ngapbuf = ngap_build_downlink_ran_status_transfer(target_ue, transfer);
if (!ngapbuf) {
ogs_error("ngap_build_uplink_ran_status_transfer() failed");
return OGS_ERROR;
}
rv = ngap_send_to_ran_ue(target_ue, ngapbuf);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_error_indication(
amf_gnb_t *gnb,
uint64_t *ran_ue_ngap_id,
uint64_t *amf_ue_ngap_id,
NGAP_Cause_PR group, long cause)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngapbuf = ogs_ngap_build_error_indication(
ran_ue_ngap_id, amf_ue_ngap_id, group, cause);
if (!ngapbuf) {
ogs_error("ogs_ngap_build_error_indication() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngapbuf, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_error_indication2(
ran_ue_t *ran_ue, NGAP_Cause_PR group, long cause)
{
int rv;
ran_ue = ran_ue_cycle(ran_ue);
if (!ran_ue) {
ogs_error("NG context has already been removed");
return OGS_NOTFOUND;
}
rv = ngap_send_error_indication(
ran_ue->gnb, &ran_ue->ran_ue_ngap_id, &ran_ue->amf_ue_ngap_id,
group, cause);
ogs_expect(rv == OGS_OK);
return rv;
}
int ngap_send_ng_reset_ack(
amf_gnb_t *gnb,
NGAP_UE_associatedLogicalNG_connectionList_t *partOfNG_Interface)
{
int rv;
ogs_pkbuf_t *ngapbuf = NULL;
if (!amf_gnb_cycle(gnb)) {
ogs_error("gNB has already been removed");
return OGS_NOTFOUND;
}
ngapbuf = ogs_ngap_build_ng_reset_ack(partOfNG_Interface);
if (!ngapbuf) {
ogs_error("ogs_ngap_build_ng_reset_ack() failed");
return OGS_ERROR;
}
rv = ngap_send_to_gnb(gnb, ngapbuf, NGAP_NON_UE_SIGNALLING);
ogs_expect(rv == OGS_OK);
return rv;
}
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