forked from acouzens/open5gs
268 lines
8.9 KiB
C
268 lines
8.9 KiB
C
/*
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* Copyright (C) 2019 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 "mme-context.h"
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#include "nas-path.h"
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#include "sgsap-path.h"
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#include "mme-gtp-path.h"
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#include "esm-build.h"
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#include "esm-handler.h"
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#undef OGS_LOG_DOMAIN
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#define OGS_LOG_DOMAIN __esm_log_domain
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int esm_handle_pdn_connectivity_request(mme_bearer_t *bearer,
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ogs_nas_eps_pdn_connectivity_request_t *req, int create_action)
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{
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mme_ue_t *mme_ue = NULL;
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mme_sess_t *sess = NULL;
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uint8_t security_protected_required = 0;
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ogs_assert(bearer);
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sess = bearer->sess;
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ogs_assert(sess);
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mme_ue = sess->mme_ue;
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ogs_assert(mme_ue);
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ogs_assert(req);
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ogs_assert(MME_UE_HAVE_IMSI(mme_ue));
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ogs_assert(SECURITY_CONTEXT_IS_VALID(mme_ue));
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memcpy(&sess->request_type, &req->request_type, sizeof(sess->request_type));
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security_protected_required = 0;
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if (req->presencemask &
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OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST_ESM_INFORMATION_TRANSFER_FLAG_PRESENT) {
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ogs_nas_esm_information_transfer_flag_t *esm_information_transfer_flag =
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&req->esm_information_transfer_flag;
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security_protected_required =
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esm_information_transfer_flag->security_protected_required;
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ogs_debug(" EIT(ESM information transfer)[%d]",
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security_protected_required);
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}
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if (req->presencemask &
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OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST_ACCESS_POINT_NAME_PRESENT) {
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sess->session = mme_session_find_by_apn(
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mme_ue, req->access_point_name.apn);
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if (!sess->session) {
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/* Invalid APN */
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ogs_assert(OGS_OK ==
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nas_eps_send_pdn_connectivity_reject(
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sess, ESM_CAUSE_MISSING_OR_UNKNOWN_APN, create_action));
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ogs_warn("Invalid APN[%s]", req->access_point_name.apn);
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return OGS_ERROR;
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}
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if (sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV4 ||
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sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV6 ||
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sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV4V6) {
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uint8_t derived_pdn_type =
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(sess->session->session_type & sess->request_type.type);
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if (derived_pdn_type == 0) {
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ogs_error("Cannot derived PDN Type [UE:%d,HSS:%d]",
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sess->request_type.type, sess->session->session_type);
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ogs_assert(OGS_OK ==
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nas_eps_send_pdn_connectivity_reject(
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sess, ESM_CAUSE_UNKNOWN_PDN_TYPE, create_action));
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return OGS_ERROR;
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}
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} else {
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ogs_fatal("Invalid PDN_TYPE[%d]", sess->session->session_type);
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ogs_assert_if_reached();
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}
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}
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if (req->presencemask &
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OGS_NAS_EPS_PDN_CONNECTIVITY_REQUEST_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT) {
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ogs_nas_protocol_configuration_options_t
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*protocol_configuration_options =
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&req->protocol_configuration_options;
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OGS_NAS_STORE_DATA(&sess->ue_pco, protocol_configuration_options);
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}
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if (security_protected_required) {
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CLEAR_BEARER_TIMER(bearer->t3489);
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ogs_assert(OGS_OK == nas_eps_send_esm_information_request(bearer));
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return OGS_OK;
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}
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if (!sess->session) {
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/* Default APN */
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sess->session = mme_default_session(mme_ue);
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}
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if (sess->session) {
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mme_bearer_t *default_bearer = NULL;
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mme_bearer_t *dedicated_bearer = NULL, *next_dedicated_bearer = NULL;
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ogs_assert(sess->session->name);
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ogs_debug(" APN[%s]", sess->session->name);
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default_bearer = mme_default_bearer_in_sess(sess);
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if (default_bearer) {
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dedicated_bearer = mme_bearer_next(default_bearer);
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while (dedicated_bearer) {
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next_dedicated_bearer = mme_bearer_next(dedicated_bearer);
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ogs_warn("Dedicated-Bearer[%d] removed forcely",
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dedicated_bearer->ebi);
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mme_bearer_remove(dedicated_bearer);
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dedicated_bearer = next_dedicated_bearer;
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}
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}
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ogs_assert(OGS_OK ==
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mme_gtp_send_create_session_request(sess, create_action));
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} else {
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ogs_error("No APN");
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ogs_assert(OGS_OK ==
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nas_eps_send_pdn_connectivity_reject(
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sess, ESM_CAUSE_MISSING_OR_UNKNOWN_APN, create_action));
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return OGS_ERROR;
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}
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return OGS_OK;
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}
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int esm_handle_information_response(mme_sess_t *sess,
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ogs_nas_eps_esm_information_response_t *rsp)
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{
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mme_ue_t *mme_ue = NULL;
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ogs_assert(sess);
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mme_ue = sess->mme_ue;
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ogs_assert(mme_ue);
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ogs_assert(rsp);
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if (rsp->presencemask &
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OGS_NAS_EPS_ESM_INFORMATION_RESPONSE_ACCESS_POINT_NAME_PRESENT) {
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ogs_session_t *session = mme_session_find_by_apn(
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mme_ue, rsp->access_point_name.apn);
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if (session) {
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sess->session = session;
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} else {
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ogs_debug(" APN[%s] not found, using default!", rsp->access_point_name.apn);
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}
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}
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if (rsp->presencemask &
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OGS_NAS_EPS_ESM_INFORMATION_RESPONSE_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT) {
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ogs_nas_protocol_configuration_options_t
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*protocol_configuration_options =
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&rsp->protocol_configuration_options;
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OGS_NAS_STORE_DATA(&sess->ue_pco, protocol_configuration_options);
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}
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if (sess->session) {
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ogs_assert(sess->session->name);
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ogs_debug(" APN[%s]", sess->session->name);
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if (sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV4 ||
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sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV6 ||
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sess->session->session_type == OGS_PDU_SESSION_TYPE_IPV4V6) {
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uint8_t derived_pdn_type =
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(sess->session->session_type & sess->request_type.type);
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if (derived_pdn_type == 0) {
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ogs_error("Cannot derived PDN Type [UE:%d,HSS:%d]",
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sess->request_type.type, sess->session->session_type);
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ogs_assert(OGS_OK ==
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nas_eps_send_pdn_connectivity_reject(
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sess, ESM_CAUSE_UNKNOWN_PDN_TYPE,
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OGS_GTP_CREATE_IN_ATTACH_REQUEST));
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return OGS_ERROR;
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}
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} else {
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ogs_fatal("Invalid PDN_TYPE[%d]", sess->session->session_type);
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ogs_assert_if_reached();
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}
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if (SESSION_CONTEXT_IS_AVAILABLE(mme_ue) &&
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OGS_PDU_SESSION_TYPE_IS_VALID(sess->session->paa.session_type)) {
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mme_csmap_t *csmap = mme_csmap_find_by_tai(&mme_ue->tai);
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mme_ue->csmap = csmap;
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if (csmap) {
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ogs_assert(OGS_OK ==
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sgsap_send_location_update_request(mme_ue));
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} else {
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ogs_assert(OGS_OK ==
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nas_eps_send_attach_accept(mme_ue));
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}
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} else {
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ogs_assert(OGS_OK ==
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mme_gtp_send_create_session_request(
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sess, OGS_GTP_CREATE_IN_ATTACH_REQUEST));
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}
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} else {
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if (rsp->access_point_name.length)
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ogs_error("Invalid APN[%s]", rsp->access_point_name.apn);
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else
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ogs_error("No APN");
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ogs_assert(OGS_OK ==
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nas_eps_send_pdn_connectivity_reject(
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sess, ESM_CAUSE_MISSING_OR_UNKNOWN_APN,
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OGS_GTP_CREATE_IN_ATTACH_REQUEST));
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return OGS_ERROR;
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}
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return OGS_OK;
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}
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int esm_handle_bearer_resource_allocation_request(
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mme_bearer_t *bearer, ogs_nas_eps_message_t *message)
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{
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mme_ue_t *mme_ue = NULL;
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mme_sess_t *sess = NULL;
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ogs_assert(bearer);
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sess = bearer->sess;
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ogs_assert(sess);
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mme_ue = sess->mme_ue;
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ogs_assert(mme_ue);
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ogs_assert(OGS_OK ==
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nas_eps_send_bearer_resource_allocation_reject(
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mme_ue, sess->pti, ESM_CAUSE_NETWORK_FAILURE));
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return OGS_OK;
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}
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int esm_handle_bearer_resource_modification_request(
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mme_bearer_t *bearer, ogs_nas_eps_message_t *message)
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{
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mme_ue_t *mme_ue = NULL;
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ogs_assert(bearer);
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mme_ue = bearer->mme_ue;
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ogs_assert(mme_ue);
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ogs_assert(OGS_OK ==
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mme_gtp_send_bearer_resource_command(bearer, message));
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return OGS_OK;
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}
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