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open5gs/src/mme/mme-s11-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 "mme-event.h"
#include "mme-sm.h"
#include "mme-context.h"
#include "s1ap-path.h"
#include "mme-gtp-path.h"
#include "nas-path.h"
#include "mme-fd-path.h"
#include "sgsap-path.h"
#include "mme-path.h"
#include "mme-s11-build.h"
#include "mme-s11-handler.h"
static uint8_t esm_cause_from_gtp(uint8_t gtp_cause)
{
switch (gtp_cause) {
case OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND:
return ESM_CAUSE_INVALID_EPS_BEARER_IDENTITY;
case OGS_GTP2_CAUSE_SERVICE_NOT_SUPPORTED:
return ESM_CAUSE_SERVICE_OPTION_NOT_SUPPORTED;
case OGS_GTP2_CAUSE_SEMANTIC_ERROR_IN_THE_TFT_OPERATION:
return ESM_CAUSE_SEMANTIC_ERROR_IN_THE_TFT_OPERATION;
case OGS_GTP2_CAUSE_SYNTACTIC_ERROR_IN_THE_TFT_OPERATION:
return ESM_CAUSE_SYNTACTICAL_ERROR_IN_THE_TFT_OPERATION;
case OGS_GTP2_CAUSE_SYNTACTIC_ERRORS_IN_PACKET_FILTER:
return ESM_CAUSE_SYNTACTICAL_ERROR_IN_PACKET_FILTERS;
case OGS_GTP2_CAUSE_SEMANTIC_ERRORS_IN_PACKET_FILTER:
return ESM_CAUSE_SEMANTIC_ERRORS_IN_PACKET_FILTERS;
default:
break;
}
/*
* OGS_GTP2_CAUSE_SYSTEM_FAILURE
* OGS_GTP2_CAUSE_MANDATORY_IE_MISSING
* ...
*/
return ESM_CAUSE_NETWORK_FAILURE;
}
void mme_s11_handle_echo_request(
ogs_gtp_xact_t *xact, ogs_gtp2_echo_request_t *req)
{
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Receiving Echo Request");
/* FIXME : Before implementing recovery counter correctly,
* I'll re-use the recovery value in request message */
ogs_gtp2_send_echo_response(xact, req->recovery.u8, 0);
}
void mme_s11_handle_echo_response(
ogs_gtp_xact_t *xact, ogs_gtp2_echo_response_t *rsp)
{
/* Not Implemented */
}
void mme_s11_handle_create_session_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_create_session_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
ogs_gtp2_f_teid_t *sgw_s11_teid = NULL;
ogs_gtp2_f_teid_t *sgw_s1u_teid = NULL;
mme_bearer_t *bearer = NULL;
mme_sess_t *sess = NULL;
mme_ue_t *mme_ue = mme_ue_from_teid;
ogs_session_t *session = NULL;
ogs_gtp2_bearer_qos_t bearer_qos;
ogs_gtp2_ambr_t *ambr = NULL;
uint16_t decoded = 0;
int create_action = 0;
ogs_assert(xact);
create_action = xact->create_action;
ogs_assert(rsp);
ogs_debug("Create Session Response");
cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
if (rsp->pdn_address_allocation.presence == 0) {
ogs_error("No PDN Address Allocation");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (rsp->sender_f_teid_for_control_plane.presence == 0) {
ogs_error("No S11 TEID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (rsp->bearer_contexts_created.s1_u_enodeb_f_teid.presence == 0) {
ogs_error("No S1U TEID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (rsp->bearer_contexts_created.presence == 0) {
ogs_error("No Bearer");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (rsp->bearer_contexts_created.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (!mme_ue) {
ogs_warn("No Context in TEID");
sess = xact->data;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED ||
cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED_PARTIALLY ||
cause_value ==
OGS_GTP2_CAUSE_NEW_PDN_TYPE_DUE_TO_NETWORK_PREFERENCE ||
cause_value ==
OGS_GTP2_CAUSE_NEW_PDN_TYPE_DUE_TO_SINGLE_ADDRESS_BEARER_ONLY) {
if (rsp->bearer_contexts_created.cause.presence) {
cause = rsp->bearer_contexts_created.cause.data;
ogs_assert(cause);
cause_value = cause->value;
} else {
ogs_error("No Cause");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
} else {
ogs_warn("GTP Failed [CAUSE:%d]", cause_value);
}
} else {
ogs_error("No Cause");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (rsp->pdn_address_allocation.presence) {
ogs_paa_t paa;
memcpy(&paa, rsp->pdn_address_allocation.data,
rsp->pdn_address_allocation.len);
if (!OGS_PDU_SESSION_TYPE_IS_VALID(paa.session_type)) {
ogs_error("Unknown PDN Type[%u]", paa.session_type);
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_INCORRECT;
}
}
if (mme_ue_from_teid && mme_ue &&
cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
bearer = mme_bearer_find_by_ue_ebi(mme_ue,
rsp->bearer_contexts_created.eps_bearer_id.u8);
}
if (!bearer) {
ogs_warn("No Context");
cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED &&
cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED_PARTIALLY &&
cause_value !=
OGS_GTP2_CAUSE_NEW_PDN_TYPE_DUE_TO_NETWORK_PREFERENCE &&
cause_value !=
OGS_GTP2_CAUSE_NEW_PDN_TYPE_DUE_TO_SINGLE_ADDRESS_BEARER_ONLY) {
if (mme_ue_from_teid && mme_ue) {
if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
ogs_error("[%s] Attach reject", mme_ue->imsi_bcd);
ogs_assert(OGS_OK ==
nas_eps_send_attach_reject(mme_ue,
EMM_CAUSE_NETWORK_FAILURE, ESM_CAUSE_NETWORK_FAILURE));
}
mme_send_delete_session_or_mme_ue_context_release(mme_ue);
}
return;
}
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
session = sess->session;
ogs_assert(session);
/* Control Plane(UL) : SGW-S11 */
sgw_s11_teid = rsp->sender_f_teid_for_control_plane.data;
mme_ue->sgw_s11_teid = be32toh(sgw_s11_teid->teid);
memcpy(&session->paa, rsp->pdn_address_allocation.data,
rsp->pdn_address_allocation.len);
/* PCO */
if (rsp->protocol_configuration_options.presence) {
OGS_TLV_STORE_DATA(&sess->pgw_pco,
&rsp->protocol_configuration_options);
}
/* Bearer QoS */
if (rsp->bearer_contexts_created.bearer_level_qos.presence) {
decoded = ogs_gtp2_parse_bearer_qos(&bearer_qos,
&rsp->bearer_contexts_created.bearer_level_qos);
ogs_assert(rsp->bearer_contexts_created.bearer_level_qos.len ==
decoded);
session->qos.index = bearer_qos.qci;
session->qos.arp.priority_level = bearer_qos.priority_level;
session->qos.arp.pre_emption_capability =
bearer_qos.pre_emption_capability;
session->qos.arp.pre_emption_vulnerability =
bearer_qos.pre_emption_vulnerability;
}
/* AMBR */
if (rsp->aggregate_maximum_bit_rate.presence) {
ambr = rsp->aggregate_maximum_bit_rate.data;
session->ambr.downlink = be32toh(ambr->downlink) * 1000;
session->ambr.uplink = be32toh(ambr->uplink) * 1000;
}
/* Data Plane(UL) : SGW-S1U */
sgw_s1u_teid = rsp->bearer_contexts_created.s1_u_enodeb_f_teid.data;
bearer->sgw_s1u_teid = be32toh(sgw_s1u_teid->teid);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
ogs_debug(" ENB_S1U_TEID[%d] SGW_S1U_TEID[%d]",
bearer->enb_s1u_teid, bearer->sgw_s1u_teid);
rv = ogs_gtp2_f_teid_to_ip(sgw_s1u_teid, &bearer->sgw_s1u_ip);
ogs_assert(rv == OGS_OK);
if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
mme_csmap_t *csmap = mme_csmap_find_by_tai(&mme_ue->tai);
mme_ue->csmap = csmap;
if (csmap) {
ogs_assert(OGS_PDU_SESSION_TYPE_IS_VALID(
session->paa.session_type));
ogs_assert(OGS_OK ==
sgsap_send_location_update_request(mme_ue));
} else {
ogs_assert(OGS_PDU_SESSION_TYPE_IS_VALID(
session->paa.session_type));
ogs_assert(OGS_OK ==
nas_eps_send_attach_accept(mme_ue));
}
} else {
ogs_assert(OGS_PDU_SESSION_TYPE_IS_VALID(session->paa.session_type));
ogs_assert(OGS_OK ==
nas_eps_send_activate_default_bearer_context_request(
bearer, create_action));
}
}
void mme_s11_handle_modify_bearer_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_modify_bearer_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
mme_ue_t *mme_ue = mme_ue_from_teid;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
ogs_assert(xact);
ogs_assert(rsp);
ogs_debug("Modify Bearer Response");
cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
if (!mme_ue) {
ogs_warn("No Context in TEID");
bearer = xact->data;
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED)
ogs_warn("GTP Failed [CAUSE:%d]", cause_value);
} else {
ogs_error("No Cause");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
if (mme_ue_from_teid && mme_ue)
mme_send_delete_session_or_mme_ue_context_release(mme_ue);
return;
}
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
GTP_COUNTER_CHECK(mme_ue, GTP_COUNTER_MODIFY_BEARER_BY_PATH_SWITCH,
ogs_assert(OGS_OK ==
s1ap_send_path_switch_ack(mme_ue));
);
GTP_COUNTER_CHECK(mme_ue, GTP_COUNTER_MODIFY_BEARER_BY_E_RAB_MODIFICATION,
ogs_assert(OGS_OK ==
s1ap_send_e_rab_modification_confirm(mme_ue));
);
}
void mme_s11_handle_delete_session_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_delete_session_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
int action = 0;
mme_ue_t *mme_ue = mme_ue_from_teid;
mme_sess_t *sess = NULL;
ogs_assert(xact);
ogs_assert(rsp);
action = xact->delete_action;
ogs_assert(action);
ogs_debug("Delete Session Response");
sess = xact->data;
ogs_assert(sess);
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED)
ogs_warn("GTP Failed [CAUSE:%d] - Ignored", cause_value);
}
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
if (action == OGS_GTP_DELETE_SEND_AUTHENTICATION_REQUEST) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {
mme_s6a_send_air(mme_ue, NULL);
}
} else if (action == OGS_GTP_DELETE_SEND_DETACH_ACCEPT) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {
ogs_assert(OGS_OK ==
nas_eps_send_detach_accept(mme_ue));
}
} else if (action ==
OGS_GTP_DELETE_SEND_DEACTIVATE_BEARER_CONTEXT_REQUEST) {
mme_bearer_t *bearer = mme_default_bearer_in_sess(sess);
ogs_expect_or_return(bearer);
ogs_assert(OGS_OK ==
nas_eps_send_deactivate_bearer_context_request(bearer));
/*
* mme_sess_remove() should not be called here.
*
* if Deactivate bearer context accept is received,
* Session will be removed */
CLEAR_SGW_S1U_PATH(sess);
return;
} else if (action == OGS_GTP_DELETE_SEND_UE_CONTEXT_RELEASE_COMMAND) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {
enb_ue_t *enb_ue = NULL;
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
if (enb_ue) {
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_UE_CONTEXT_REMOVE, 0));
} else
ogs_warn("ENB-S1 Context has already been removed");
}
} else if (action == OGS_GTP_DELETE_HANDLE_PDN_CONNECTIVITY_REQUEST) {
if (mme_sess_count(mme_ue) == 1) /* Last Session */ {
rv = nas_eps_send_emm_to_esm(mme_ue,
&mme_ue->pdn_connectivity_request);
if (rv != OGS_OK) {
ogs_error("nas_eps_send_emm_to_esm() failed");
ogs_assert(OGS_OK ==
nas_eps_send_attach_reject(mme_ue,
EMM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED,
ESM_CAUSE_PROTOCOL_ERROR_UNSPECIFIED));
}
}
} else if (action == OGS_GTP_DELETE_UE_CONTEXT_REMOVE) {
/* Remove MME-UE Context with Session Context since IMSI duplicated */
mme_ue_remove(mme_ue);
return;
} else {
ogs_fatal("Invalid action = %d", action);
ogs_assert_if_reached();
}
if (mme_sess_count(mme_ue) == 1) /* Last Session */
CLEAR_SESSION_CONTEXT(mme_ue);
mme_sess_remove(sess);
}
void mme_s11_handle_create_bearer_request(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue,
ogs_gtp2_create_bearer_request_t *req)
{
int rv;
uint8_t cause_value = 0;
mme_bearer_t *bearer = NULL, *default_bearer = NULL;
mme_sess_t *sess = NULL;
ogs_gtp2_f_teid_t *sgw_s1u_teid = NULL;
ogs_gtp2_bearer_qos_t bearer_qos;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Create Bearer Response");
cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
if (req->linked_eps_bearer_id.presence == 0) {
ogs_error("No Linked EBI");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.presence == 0) {
ogs_error("No Bearer");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.s1_u_enodeb_f_teid.presence == 0) {
ogs_error("No GTP TEID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.bearer_level_qos.presence == 0) {
ogs_error("No QoS");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.tft.presence == 0) {
ogs_error("No TFT");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (mme_ue && cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
sess = mme_sess_find_by_ebi(mme_ue, req->linked_eps_bearer_id.u8);
if (sess) bearer = mme_bearer_add(sess);
}
if (!bearer) {
ogs_warn("No Context");
cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp2_send_error_message(xact, mme_ue ? mme_ue->sgw_s11_teid : 0,
OGS_GTP2_CREATE_BEARER_RESPONSE_TYPE, cause_value);
return;
}
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
/* Set PTI */
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
sess->pti = OGS_NAS_PROCEDURE_TRANSACTION_IDENTITY_UNASSIGNED;
if (req->procedure_transaction_id.presence) {
sess->pti = req->procedure_transaction_id.u8;
ogs_debug(" PTI[%d]", sess->pti);
}
/* Data Plane(UL) : SGW-S1U */
sgw_s1u_teid = req->bearer_contexts.s1_u_enodeb_f_teid.data;
bearer->sgw_s1u_teid = be32toh(sgw_s1u_teid->teid);
rv = ogs_gtp2_f_teid_to_ip(sgw_s1u_teid, &bearer->sgw_s1u_ip);
ogs_assert(rv == OGS_OK);
/* Bearer QoS */
ogs_expect_or_return(ogs_gtp2_parse_bearer_qos(&bearer_qos,
&req->bearer_contexts.bearer_level_qos) ==
req->bearer_contexts.bearer_level_qos.len);
bearer->qos.index = bearer_qos.qci;
bearer->qos.arp.priority_level = bearer_qos.priority_level;
bearer->qos.arp.pre_emption_capability =
bearer_qos.pre_emption_capability;
bearer->qos.arp.pre_emption_vulnerability =
bearer_qos.pre_emption_vulnerability;
bearer->qos.mbr.downlink = bearer_qos.dl_mbr;
bearer->qos.mbr.uplink = bearer_qos.ul_mbr;
bearer->qos.gbr.downlink = bearer_qos.dl_gbr;
bearer->qos.gbr.uplink = bearer_qos.ul_gbr;
if (bearer->qos.mbr.downlink || bearer->qos.mbr.uplink ||
bearer->qos.gbr.downlink || bearer->qos.gbr.uplink) {
if (bearer->qos.mbr.downlink == 0)
bearer->qos.mbr.downlink = MAX_BIT_RATE;
if (bearer->qos.mbr.uplink == 0)
bearer->qos.mbr.uplink = MAX_BIT_RATE;
if (bearer->qos.gbr.downlink == 0)
bearer->qos.gbr.downlink = MAX_BIT_RATE;
if (bearer->qos.gbr.uplink == 0)
bearer->qos.gbr.uplink = MAX_BIT_RATE;
}
/* Save Bearer TFT */
OGS_TLV_STORE_DATA(&bearer->tft, &req->bearer_contexts.tft);
/*
* Save Transaction. It will be handled after EMM-attached
*
* You should not remove OLD bearer->xact.
* If GTP-xact Holding timer is expired,
* OLD bearer->xact memory will be automatically removed.
*/
bearer->current.xact = xact;
bearer->create.xact = xact;
/* Before Activate DEDICATED bearer, check DEFAULT bearer status */
default_bearer = mme_default_bearer_in_sess(sess);
ogs_expect_or_return(default_bearer);
if (OGS_FSM_CHECK(&default_bearer->sm, esm_state_active)) {
if (ECM_IDLE(mme_ue)) {
ogs_assert(OGS_OK == s1ap_send_paging(mme_ue, S1AP_CNDomain_ps));
} else {
ogs_assert(OGS_OK ==
nas_eps_send_activate_dedicated_bearer_context_request(bearer));
}
} else {
/*
* After received Activate EPS default bearer context accept
* Invoke nas_eps_send_activate_all_dedicated_bearers()
*/
}
}
void mme_s11_handle_update_bearer_request(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue,
ogs_gtp2_update_bearer_request_t *req)
{
uint8_t cause_value = 0;
mme_bearer_t *bearer = NULL;
mme_sess_t *sess = NULL;
ogs_gtp2_bearer_qos_t bearer_qos;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Update Bearer Request");
cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
if (req->bearer_contexts.presence == 0) {
ogs_error("No Bearer");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (req->bearer_contexts.eps_bearer_id.presence == 0) {
ogs_error("No EPS Bearer ID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (mme_ue && cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
bearer = mme_bearer_find_by_ue_ebi(mme_ue,
req->bearer_contexts.eps_bearer_id.u8);
}
if (!bearer) {
ogs_warn("No Context");
cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp2_send_error_message(xact, mme_ue ? mme_ue->sgw_s11_teid : 0,
OGS_GTP2_UPDATE_BEARER_RESPONSE_TYPE, cause_value);
return;
}
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
/* Set PTI */
ogs_assert(mme_ue);
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
sess->pti = OGS_NAS_PROCEDURE_TRANSACTION_IDENTITY_UNASSIGNED;
if (req->procedure_transaction_id.presence) {
sess->pti = req->procedure_transaction_id.u8;
ogs_debug(" PTI[%d]", sess->pti);
}
/*
* Save Transaction. It will be handled after EMM-attached
*
* You should not remove OLD bearer->xact.
* If GTP-xact Holding timer is expired,
* OLD bearer->xact memory will be automatically removed.
*/
bearer->current.xact = xact;
bearer->update.xact = xact;
if (req->bearer_contexts.bearer_level_qos.presence == 1) {
/* Bearer QoS */
ogs_expect_or_return(ogs_gtp2_parse_bearer_qos(&bearer_qos,
&req->bearer_contexts.bearer_level_qos) ==
req->bearer_contexts.bearer_level_qos.len);
bearer->qos.index = bearer_qos.qci;
bearer->qos.arp.priority_level = bearer_qos.priority_level;
bearer->qos.arp.pre_emption_capability =
bearer_qos.pre_emption_capability;
bearer->qos.arp.pre_emption_vulnerability =
bearer_qos.pre_emption_vulnerability;
bearer->qos.mbr.downlink = bearer_qos.dl_mbr;
bearer->qos.mbr.uplink = bearer_qos.ul_mbr;
bearer->qos.gbr.downlink = bearer_qos.dl_gbr;
bearer->qos.gbr.uplink = bearer_qos.ul_gbr;
xact->update_flags |= OGS_GTP_MODIFY_QOS_UPDATE;
}
if (req->bearer_contexts.tft.presence == 1) {
/* Save Bearer TFT */
OGS_TLV_STORE_DATA(&bearer->tft, &req->bearer_contexts.tft);
xact->update_flags |= OGS_GTP_MODIFY_TFT_UPDATE;
}
if (req->bearer_contexts.bearer_level_qos.presence == 1 ||
req->bearer_contexts.tft.presence == 1) {
if (ECM_IDLE(mme_ue)) {
ogs_assert(OGS_OK == s1ap_send_paging(mme_ue, S1AP_CNDomain_ps));
} else {
ogs_assert(OGS_OK ==
nas_eps_send_modify_bearer_context_request(bearer,
req->bearer_contexts.bearer_level_qos.presence,
req->bearer_contexts.tft.presence));
}
} else {
ogs_warn("[IGNORE] Update Bearer Request : "
"Both QoS and TFT is NULL");
if (xact->xid & OGS_GTP_CMD_XACT_ID) {
/* MME received Bearer Resource Modification Request */
ogs_assert(OGS_OK ==
nas_eps_send_bearer_resource_modification_reject(
mme_ue, sess->pti, ESM_CAUSE_SERVICE_OPTION_NOT_SUPPORTED));
}
ogs_assert(OGS_OK ==
mme_gtp_send_update_bearer_response(
bearer, OGS_GTP2_CAUSE_REQUEST_ACCEPTED));
}
}
void mme_s11_handle_delete_bearer_request(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue,
ogs_gtp2_delete_bearer_request_t *req)
{
mme_bearer_t *bearer = NULL;
mme_sess_t *sess = NULL;
ogs_assert(xact);
ogs_assert(req);
ogs_debug("Delete Bearer Request");
if (mme_ue && req->linked_eps_bearer_id.presence == 1) {
/*
* << Linked EPS Bearer ID >>
*
* 1. SMF sends Delete Bearer Request(DEFAULT BEARER) to SGW/MME.
* 2. MME sends Delete Bearer Response to SGW/SMF.
*
* OR
*
* 1. SMF sends Delete Bearer Request(DEFAULT BEARER) to ePDG.
* 2. ePDG sends Delete Bearer Response(DEFAULT BEARER) to SMF.
*/
bearer = mme_bearer_find_by_ue_ebi(
mme_ue, req->linked_eps_bearer_id.u8);
if (!bearer)
ogs_error("Cannot find Bearer [%d]", req->linked_eps_bearer_id.u8);
} else if (mme_ue && req->eps_bearer_ids.presence == 1) {
/*
* << EPS Bearer IDs >>
*
* 1. MME sends Bearer Resource Command to SGW/SMF.
* 2. SMF sends Delete Bearer Request(DEDICATED BEARER) to SGW/MME.
* 3. MME sends Delete Bearer Response(DEDICATED BEARER) to SGW/SMF.
*
* OR
*
* 1. SMF sends Delete Bearer Request(DEDICATED BEARER) to SGW/MME.
* 2. MME sends Delete Bearer Response(DEDICATED BEARER) to SGW/SMF.
*/
bearer = mme_bearer_find_by_ue_ebi(
mme_ue, req->eps_bearer_ids.u8);
if (!bearer)
ogs_error("Cannot find Bearer [%d]", req->eps_bearer_ids.u8);
} else {
ogs_error("No Linked EBI or EPS Bearer ID");
}
if (!bearer) {
ogs_error("No Context");
ogs_gtp2_send_error_message(xact, mme_ue ? mme_ue->sgw_s11_teid : 0,
OGS_GTP2_DELETE_BEARER_RESPONSE_TYPE,
OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND);
return;
}
ogs_assert(mme_ue);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
/* Set PTI */
ogs_assert(bearer);
sess = bearer->sess;
ogs_assert(sess);
sess->pti = OGS_NAS_PROCEDURE_TRANSACTION_IDENTITY_UNASSIGNED;
if (req->procedure_transaction_id.presence) {
sess->pti = req->procedure_transaction_id.u8;
ogs_debug(" PTI[%d]", sess->pti);
}
ogs_assert(bearer);
/*
* Save Transaction. It will be handled after EMM-attached
*
* You should not remove OLD bearer->xact.
* If GTP-xact Holding timer is expired,
* OLD bearer->xact memory will be automatically removed.
*/
bearer->current.xact = xact;
bearer->delete.xact = xact;
if (ECM_IDLE(mme_ue)) {
ogs_assert(OGS_OK == s1ap_send_paging(mme_ue, S1AP_CNDomain_ps));
} else {
ogs_assert(OGS_OK ==
nas_eps_send_deactivate_bearer_context_request(bearer));
}
}
void mme_s11_handle_release_access_bearers_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_release_access_bearers_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
int action = 0;
enb_ue_t *enb_ue = NULL;
mme_ue_t *mme_ue = mme_ue_from_teid;
mme_sess_t *sess = NULL;
mme_bearer_t *bearer = NULL;
ogs_assert(xact);
ogs_assert(rsp);
action = xact->release_action;
ogs_assert(action);
ogs_debug("Release Access Bearers Response");
if (!mme_ue) {
ogs_warn("No Context in TEID");
mme_ue = xact->data;
ogs_assert(mme_ue);
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED)
ogs_warn("GTP Failed [CAUSE:%d]", cause_value);
}
ogs_assert(mme_ue);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
ogs_list_for_each(&mme_ue->sess_list, sess) {
ogs_list_for_each(&sess->bearer_list, bearer) {
CLEAR_ENB_S1U_PATH(bearer);
}
}
if (action == OGS_GTP_RELEASE_SEND_UE_CONTEXT_RELEASE_COMMAND) {
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
if (enb_ue) {
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_S1_REMOVE_AND_UNLINK, 0));
} else {
ogs_warn("ENB-S1 Context has already been removed");
}
} else if (action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_LO_CONNREFUSED) {
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
mme_ue_deassociate(mme_ue);
if (enb_ue) {
enb_ue_remove(enb_ue);
} else {
ogs_warn("ENB-S1 Context has already been removed");
}
/*
* TS36.413
* 8.7.1.2.1 Reset Procedure Initiated from the MME
*
* The eNB does not need to wait for the release of radio resources
* to be completed before returning the RESET ACKNOWLEDGE message.
*
* 8.7.1.2.2 Reset Procedure Initiated from the E-UTRAN
* After the MME has released all assigned S1 resources and
* the UE S1AP IDs for all indicated UE associations which can be used
* for new UE-associated logical S1-connections over the S1 interface,
* the MME shall respond with the RESET ACKNOWLEDGE message.
*/
} else if (action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_RESET_ALL) {
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
mme_ue_deassociate(mme_ue);
if (enb_ue) {
mme_enb_t *enb = enb_ue->enb;
ogs_assert(enb);
enb_ue_remove(enb_ue);
if (ogs_list_count(&enb->enb_ue_list) == 0)
ogs_assert(OGS_OK ==
s1ap_send_s1_reset_ack(enb, NULL));
} else {
ogs_warn("ENB-S1 Context has already been removed");
}
} else if (action == OGS_GTP_RELEASE_S1_CONTEXT_REMOVE_BY_RESET_PARTIAL) {
enb_ue_t *iter = NULL;
enb_ue = enb_ue_cycle(mme_ue->enb_ue);
mme_ue_deassociate(mme_ue);
if (enb_ue) {
mme_enb_t *enb = enb_ue->enb;
ogs_assert(enb);
enb_ue_remove(enb_ue);
ogs_list_for_each(&enb->enb_ue_list, iter) {
if (iter->part_of_s1_reset_requested == true) {
/* The ENB_UE context
* where PartOfS1_interface was requested
* still remains */
return;
}
}
/* All ENB_UE context
* where PartOfS1_interface was requested
* REMOVED */
ogs_assert(enb->s1_reset_ack);
s1ap_send_to_enb(enb, enb->s1_reset_ack, S1AP_NON_UE_SIGNALLING);
/* Clear S1-Reset Ack Buffer */
enb->s1_reset_ack = NULL;
} else {
ogs_warn("ENB-S1 Context has already been removed");
}
} else {
ogs_fatal("Invalid action = %d", action);
ogs_assert_if_reached();
}
}
void mme_s11_handle_downlink_data_notification(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue,
ogs_gtp2_downlink_data_notification_t *noti)
{
uint8_t cause_value = 0;
mme_bearer_t *bearer = NULL;
ogs_assert(xact);
ogs_assert(noti);
ogs_debug("Downlink Data Notification");
cause_value = OGS_GTP2_CAUSE_REQUEST_ACCEPTED;
if (noti->eps_bearer_id.presence == 0) {
ogs_error("No Bearer ID");
cause_value = OGS_GTP2_CAUSE_MANDATORY_IE_MISSING;
}
if (!mme_ue) {
ogs_error("No UE Context");
cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
}
if (cause_value == OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
bearer = mme_bearer_find_by_ue_ebi(mme_ue, noti->eps_bearer_id.u8);
if (!bearer)
ogs_error("No Context for EPS Bearer ID[%d]",
noti->eps_bearer_id.u8);
}
if (!bearer) {
ogs_error("No Bearer Context");
cause_value = OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND;
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
ogs_gtp2_send_error_message(xact, mme_ue ? mme_ue->sgw_s11_teid : 0,
OGS_GTP2_DOWNLINK_DATA_NOTIFICATION_ACKNOWLEDGE_TYPE,
OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND);
return;
}
ogs_assert(mme_ue);
ogs_assert(bearer);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
/*
* Save Transaction. It will be handled after ECM-Connected
*
* You should not remove OLD bearer->xact.
* If GTP-xact Holding timer is expired,
* OLD bearer->xact memory will be automatically removed.
*/
bearer->current.xact = xact;
bearer->notify.xact = xact;
if (noti->cause.presence) {
ogs_gtp2_cause_t *cause = noti->cause.data;
ogs_assert(cause);
cause_value = cause->value;
}
/*
* 5.3.4.2 in Spec 23.401
* Under certain conditions, the current UE triggered Service Request
* procedure can cause unnecessary Downlink Packet Notification messages
* which increase the load of the MME.
*
* This can occur when uplink data sent in step 6 causes a response
* on the downlink which arrives at the Serving GW before the Modify Bearer
* Request message, step 8. This data cannot be forwarded from the Serving GW
* to the eNodeB and hence it triggers a Downlink Data Notification message.
*
* If the MME receives a Downlink Data Notification after step 2 and
* before step 9, the MME shall not send S1 interface paging messages
*/
if (ECM_IDLE(mme_ue)) {
ogs_assert(OGS_OK == s1ap_send_paging(mme_ue, S1AP_CNDomain_ps));
} else if (ECM_CONNECTED(mme_ue)) {
if (cause_value == OGS_GTP2_CAUSE_ERROR_INDICATION_RECEIVED) {
/*
* TS23.007 22. Downlink Data Notification Handling at MME/S4 SGSN
*
* If the MME/S4 SGSN receives a Downlink Data Notification message from
* the SGW as a result of the SGW having received an Error Indication message
* from the eNodeB/RNC or S4-SGSN over S4 User Plane, the MME/S4 SGSN should
* perform the following:
*
* - If the UE is in IDLE state, upon receipt of the Downlink Data
* Notification message, the MME/S4 SGSN shall perform the Network
* Triggered Service Request procedure as specified in 3GPP TS 23.060[5]
* and 3GPP TS 23.401 [15].
* - If the UE is in CONNECTED state, upon receipt of the Downlink Data
* Notification message, the MME shall perform S1 Release procedure and
* perform Network Triggered Service Request procedure as specified
* in 3GPP TS 23.401 [15].
* - If the UE is in CONNECTED state, upon receipt of the Downlink Data
* Notification message and Direct Tunnel is used, the S4-SGSN shall
* perform Iu Release procedure and perform Network Triggered Service
* Request procedure as specified in 3GPP TS 23.060 [5]
* if the cause value included in Downlink Data Notification is
* "Error Indication received from RNC/eNodeB/S4-SGSN",
* - If the UE is in CONNECTED state, upon receipt of the Downlink Data
* Notification message and Direct Tunnel is not used, the S4-SGSN should
* re-establish all of the S4-U bearers of this UE if the cause value
* included in Downlink Data Notification is "Error Indication received
* from RNC/eNodeB/S4-SGSN"
*/
enb_ue_t *enb_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(enb_ue);
ogs_assert(OGS_OK ==
s1ap_send_ue_context_release_command(enb_ue,
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release,
S1AP_UE_CTX_REL_S1_PAGING, 0));
} else {
ogs_assert(OGS_OK ==
mme_gtp_send_downlink_data_notification_ack(
bearer, OGS_GTP2_CAUSE_UE_ALREADY_RE_ATTACHED));
}
}
}
void mme_s11_handle_create_indirect_data_forwarding_tunnel_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_create_indirect_data_forwarding_tunnel_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
mme_ue_t *mme_ue = mme_ue_from_teid;
mme_bearer_t *bearer = NULL;
enb_ue_t *source_ue = NULL;
int i;
ogs_gtp2_f_teid_t *teid = NULL;
ogs_assert(xact);
ogs_assert(rsp);
ogs_debug("Create Indirect Data Forwarding Tunnel Response");
if (!mme_ue) {
ogs_warn("No Context in TEID");
mme_ue = xact->data;
ogs_assert(mme_ue);
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED)
ogs_warn("GTP Failed [CAUSE:%d]", cause_value);
}
ogs_assert(mme_ue);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
if (mme_ue_from_teid && mme_ue)
mme_send_delete_session_or_mme_ue_context_release(mme_ue);
return;
}
for (i = 0; rsp->bearer_contexts[i].presence; i++) {
if (rsp->bearer_contexts[i].eps_bearer_id.presence == 0) {
ogs_error("No EBI");
return;
}
bearer = mme_bearer_find_by_ue_ebi(mme_ue,
rsp->bearer_contexts[i].eps_bearer_id.u8);
ogs_expect_or_return(bearer);
if (rsp->bearer_contexts[i].s4_u_sgsn_f_teid.presence) {
teid = rsp->bearer_contexts[i].s4_u_sgsn_f_teid.data;
ogs_assert(teid);
bearer->sgw_dl_teid = be32toh(teid->teid);
rv = ogs_gtp2_f_teid_to_ip(teid, &bearer->sgw_dl_ip);
ogs_assert(rv == OGS_OK);
}
if (rsp->bearer_contexts[i].s2b_u_epdg_f_teid_5.presence) {
teid = rsp->bearer_contexts[i].s2b_u_epdg_f_teid_5.data;
ogs_assert(teid);
bearer->sgw_ul_teid = be32toh(teid->teid);
rv = ogs_gtp2_f_teid_to_ip(teid, &bearer->sgw_ul_ip);
ogs_assert(rv == OGS_OK);
}
}
source_ue = enb_ue_cycle(mme_ue->enb_ue);
ogs_assert(source_ue);
ogs_assert(OGS_OK ==
s1ap_send_handover_command(source_ue));
}
void mme_s11_handle_delete_indirect_data_forwarding_tunnel_response(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_delete_indirect_data_forwarding_tunnel_response_t *rsp)
{
int rv;
uint8_t cause_value = 0;
int action = 0;
mme_ue_t *mme_ue = mme_ue_from_teid;
ogs_assert(xact);
action = xact->delete_indirect_action;
ogs_assert(action);
ogs_assert(rsp);
ogs_debug("Delete Indirect Data Forwarding Tunnel Response");
if (!mme_ue) {
ogs_warn("No Context in TEID");
mme_ue = xact->data;
ogs_assert(mme_ue);
}
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (rsp->cause.presence) {
ogs_gtp2_cause_t *cause = rsp->cause.data;
ogs_assert(cause);
cause_value = cause->value;
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED)
ogs_warn("GTP Failed [CAUSE:%d]", cause_value);
}
if (cause_value != OGS_GTP2_CAUSE_REQUEST_ACCEPTED) {
if (mme_ue_from_teid && mme_ue)
mme_send_delete_session_or_mme_ue_context_release(mme_ue);
return;
}
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
mme_ue_clear_indirect_tunnel(mme_ue);
if (action == OGS_GTP_DELETE_INDIRECT_HANDOVER_COMPLETE) {
/* Nothing to do */
} else if (action == OGS_GTP_DELETE_INDIRECT_HANDOVER_CANCEL) {
ogs_assert(OGS_OK ==
s1ap_send_handover_cancel_ack(mme_ue->enb_ue));
} else {
ogs_fatal("Invalid action = %d", action);
ogs_assert_if_reached();
}
}
void mme_s11_handle_bearer_resource_failure_indication(
ogs_gtp_xact_t *xact, mme_ue_t *mme_ue_from_teid,
ogs_gtp2_bearer_resource_failure_indication_t *ind)
{
int rv;
uint8_t cause_value = 0;
mme_bearer_t *bearer = NULL;
mme_sess_t *sess = NULL;
mme_ue_t *mme_ue = mme_ue_from_teid;
ogs_assert(xact);
bearer = xact->data;
ogs_assert(ind);
sess = bearer->sess;
ogs_assert(sess);
if (!mme_ue) {
ogs_warn("No Context in TEID");
mme_ue = sess->mme_ue;
ogs_assert(mme_ue);
}
ogs_debug("Bearer Resource Failure Indication");
rv = ogs_gtp_xact_commit(xact);
ogs_expect_or_return(rv == OGS_OK);
if (ind->cause.presence) {
ogs_gtp2_cause_t *cause = ind->cause.data;
ogs_assert(cause);
cause_value = cause->value;
ogs_warn("GTP Failed [CAUSE:%d] - Ignored", cause_value);
} else {
ogs_error("No Cause");
}
ogs_assert(mme_ue);
ogs_debug(" MME_S11_TEID[%d] SGW_S11_TEID[%d]",
mme_ue->mme_s11_teid, mme_ue->sgw_s11_teid);
ogs_assert(OGS_OK ==
nas_eps_send_bearer_resource_modification_reject(
mme_ue, sess->pti, esm_cause_from_gtp(cause_value)));
if (cause_value == OGS_GTP2_CAUSE_CONTEXT_NOT_FOUND) {
ogs_warn("No Bearer");
mme_bearer_remove(bearer);
}
}
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