618 lines
17 KiB
C
618 lines
17 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 "s1ap-path.h"
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#include "s1ap-build.h"
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#include "esm-build.h"
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#include "emm-build.h"
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#include "nas-path.h"
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#include "mme-event.h"
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#include "mme-timer.h"
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#include "mme-sm.h"
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int nas_eps_send_to_enb(mme_ue_t *mme_ue, ogs_pkbuf_t *pkbuf)
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{
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enb_ue_t *enb_ue = NULL;
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ogs_assert(mme_ue);
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enb_ue = enb_ue_cycle(mme_ue->enb_ue);
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ogs_expect_or_return_val(enb_ue, OGS_ERROR);
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return s1ap_send_to_enb_ue(enb_ue, pkbuf);
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}
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int nas_eps_send_emm_to_esm(mme_ue_t *mme_ue,
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ogs_nas_esm_message_container_t *esm_message_container)
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{
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int rv;
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ogs_pkbuf_t *esmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_assert(esm_message_container);
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ogs_assert(esm_message_container->length);
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/* The Packet Buffer(pkbuf_t) for NAS message MUST make a HEADROOM.
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* When calculating AES_CMAC, we need to use the headroom of the packet. */
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esmbuf = ogs_pkbuf_alloc(NULL,
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OGS_NAS_HEADROOM+esm_message_container->length);
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ogs_assert(esmbuf);
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ogs_pkbuf_reserve(esmbuf, OGS_NAS_HEADROOM);
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ogs_pkbuf_put_data(esmbuf,
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esm_message_container->buffer, esm_message_container->length);
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rv = s1ap_send_to_esm(mme_ue, esmbuf, 0, OGS_GTP_CREATE_IN_ATTACH_REQUEST);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int nas_eps_send_to_downlink_nas_transport(mme_ue_t *mme_ue, ogs_pkbuf_t *pkbuf)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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enb_ue_t *enb_ue = NULL;
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ogs_assert(pkbuf);
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ogs_assert(mme_ue);
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enb_ue = enb_ue_cycle(mme_ue->enb_ue);
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if (!enb_ue) {
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ogs_error("S1 context has already been removed");
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ogs_pkbuf_free(pkbuf);
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return OGS_ERROR;
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} else {
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s1apbuf = s1ap_build_downlink_nas_transport(enb_ue, pkbuf);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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}
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int nas_eps_send_attach_accept(mme_ue_t *mme_ue)
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{
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int rv;
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mme_sess_t *sess = NULL;
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mme_bearer_t *bearer = NULL;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_pkbuf_t *esmbuf = NULL, *emmbuf = NULL;
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ogs_assert(mme_ue);
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sess = mme_sess_first(mme_ue);
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ogs_assert(sess);
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ogs_assert(mme_sess_next(sess) == NULL);
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bearer = mme_default_bearer_in_sess(sess);
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ogs_assert(bearer);
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ogs_assert(mme_bearer_next(bearer) == NULL);
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ogs_debug("[%s] Attach accept", mme_ue->imsi_bcd);
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esmbuf = esm_build_activate_default_bearer_context_request(
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sess, OGS_GTP_CREATE_IN_ATTACH_REQUEST);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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emmbuf = emm_build_attach_accept(mme_ue, esmbuf);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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CLEAR_MME_UE_TIMER(mme_ue->t3450);
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mme_ue->t3450.pkbuf = ogs_pkbuf_copy(emmbuf);
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ogs_expect_or_return_val(mme_ue->t3450.pkbuf, OGS_ERROR);
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ogs_timer_start(mme_ue->t3450.timer,
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mme_timer_cfg(MME_TIMER_T3450)->duration);
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s1apbuf = s1ap_build_initial_context_setup_request(mme_ue, emmbuf);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int nas_eps_send_attach_reject(mme_ue_t *mme_ue,
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ogs_nas_emm_cause_t emm_cause, ogs_nas_esm_cause_t esm_cause)
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{
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int rv;
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mme_sess_t *sess = NULL;
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ogs_pkbuf_t *esmbuf = NULL, *emmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("[%s] Attach reject", mme_ue->imsi_bcd);
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ogs_debug(" Cause[%d]", emm_cause);
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sess = mme_sess_first(mme_ue);
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if (sess) {
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esmbuf = esm_build_pdn_connectivity_reject(
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sess, esm_cause, OGS_GTP_CREATE_IN_ATTACH_REQUEST);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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}
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emmbuf = emm_build_attach_reject(emm_cause, esmbuf);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_identity_request(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *emmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("Identity request");
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if (mme_ue->t3470.pkbuf) {
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emmbuf = mme_ue->t3470.pkbuf;
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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} else {
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emmbuf = emm_build_identity_request(mme_ue);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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}
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mme_ue->t3470.pkbuf = ogs_pkbuf_copy(emmbuf);
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ogs_expect_or_return_val(mme_ue->t3470.pkbuf, OGS_ERROR);
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ogs_timer_start(mme_ue->t3470.timer,
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mme_timer_cfg(MME_TIMER_T3470)->duration);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_authentication_request(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *emmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("[%s] Authentication request", mme_ue->imsi_bcd);
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if (mme_ue->t3460.pkbuf) {
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emmbuf = mme_ue->t3460.pkbuf;
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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} else {
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emmbuf = emm_build_authentication_request(mme_ue);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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}
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mme_ue->t3460.pkbuf = ogs_pkbuf_copy(emmbuf);
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ogs_expect_or_return_val(mme_ue->t3460.pkbuf, OGS_ERROR);
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ogs_timer_start(mme_ue->t3460.timer,
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mme_timer_cfg(MME_TIMER_T3460)->duration);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_security_mode_command(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *emmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("[%s] Security mode command", mme_ue->imsi_bcd);
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if (mme_ue->t3460.pkbuf) {
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emmbuf = mme_ue->t3460.pkbuf;
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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} else {
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emmbuf = emm_build_security_mode_command(mme_ue);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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}
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mme_ue->t3460.pkbuf = ogs_pkbuf_copy(emmbuf);
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ogs_expect_or_return_val(mme_ue->t3460.pkbuf, OGS_ERROR);
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ogs_timer_start(mme_ue->t3460.timer,
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mme_timer_cfg(MME_TIMER_T3460)->duration);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_authentication_reject(mme_ue_t *mme_ue)
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{
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int rv;
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ogs_pkbuf_t *emmbuf = NULL;
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ogs_assert(mme_ue);
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ogs_debug("[%s] Authentication reject", mme_ue->imsi_bcd);
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emmbuf = emm_build_authentication_reject();
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_detach_accept(mme_ue_t *mme_ue)
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{
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int rv;
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enb_ue_t *enb_ue = NULL;
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ogs_pkbuf_t *emmbuf = NULL;
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ogs_assert(mme_ue);
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enb_ue = enb_ue_cycle(mme_ue->enb_ue);
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ogs_expect_or_return_val(enb_ue, OGS_ERROR);
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ogs_debug("[%s] Detach accept", mme_ue->imsi_bcd);
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/* reply with detach accept */
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if (mme_ue->nas_eps.detach.switch_off == 0) {
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emmbuf = emm_build_detach_accept(mme_ue);
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ogs_expect_or_return_val(emmbuf, OGS_ERROR);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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}
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rv = s1ap_send_ue_context_release_command(enb_ue,
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S1AP_Cause_PR_nas, S1AP_CauseNas_detach,
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S1AP_UE_CTX_REL_S1_REMOVE_AND_UNLINK, 0);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int nas_eps_send_pdn_connectivity_reject(
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mme_sess_t *sess, ogs_nas_esm_cause_t esm_cause, int create_action)
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{
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int rv;
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mme_ue_t *mme_ue;
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ogs_pkbuf_t *esmbuf = 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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if (create_action == OGS_GTP_CREATE_IN_ATTACH_REQUEST) {
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/* During the UE-attach process, we'll send Attach-Reject
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* with pyggybacking PDN-connectivity-Reject */
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rv = nas_eps_send_attach_reject(mme_ue,
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EMM_CAUSE_EPS_SERVICES_AND_NON_EPS_SERVICES_NOT_ALLOWED, esm_cause);
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ogs_expect(rv == OGS_OK);
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} else {
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esmbuf = esm_build_pdn_connectivity_reject(
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sess, esm_cause, create_action);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, esmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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}
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return rv;
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}
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int nas_eps_send_esm_information_request(mme_bearer_t *bearer)
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{
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int rv;
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mme_ue_t *mme_ue = NULL;
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ogs_pkbuf_t *esmbuf = 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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if (bearer->t3489.pkbuf) {
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esmbuf = bearer->t3489.pkbuf;
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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} else {
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esmbuf = esm_build_information_request(bearer);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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}
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bearer->t3489.pkbuf = ogs_pkbuf_copy(esmbuf);
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ogs_expect_or_return_val(bearer->t3489.pkbuf, OGS_ERROR);
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ogs_timer_start(bearer->t3489.timer,
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mme_timer_cfg(MME_TIMER_T3489)->duration);
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, esmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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return rv;
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}
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int nas_eps_send_activate_default_bearer_context_request(
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mme_bearer_t *bearer, int create_action)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_pkbuf_t *esmbuf = NULL;
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mme_sess_t *sess = NULL;
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mme_ue_t *mme_ue = 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 = bearer->mme_ue;
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ogs_assert(mme_ue);
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esmbuf = esm_build_activate_default_bearer_context_request(
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sess, create_action);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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s1apbuf = s1ap_build_e_rab_setup_request(bearer, esmbuf);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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int nas_eps_send_activate_dedicated_bearer_context_request(
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mme_bearer_t *bearer)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_pkbuf_t *esmbuf = NULL;
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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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esmbuf = esm_build_activate_dedicated_bearer_context_request(bearer);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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s1apbuf = s1ap_build_e_rab_setup_request(bearer, esmbuf);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect(rv == OGS_OK);
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return rv;
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}
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void nas_eps_send_activate_all_dedicated_bearers(mme_bearer_t *default_bearer)
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{
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ogs_assert(default_bearer);
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mme_bearer_t *dedicated_bearer = mme_bearer_next(default_bearer);
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while (dedicated_bearer) {
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nas_eps_send_activate_dedicated_bearer_context_request(
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dedicated_bearer);
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dedicated_bearer = mme_bearer_next(dedicated_bearer);
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}
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}
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int nas_eps_send_modify_bearer_context_request(
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mme_bearer_t *bearer, int qos_presence, int tft_presence)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_pkbuf_t *esmbuf = NULL;
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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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esmbuf = esm_build_modify_bearer_context_request(
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bearer, qos_presence, tft_presence);
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ogs_expect_or_return_val(esmbuf, OGS_ERROR);
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if (qos_presence == 1) {
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s1apbuf = s1ap_build_e_rab_modify_request(bearer, esmbuf);
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ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
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rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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} else {
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rv = nas_eps_send_to_downlink_nas_transport(mme_ue, esmbuf);
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ogs_expect_or_return_val(rv == OGS_OK, rv);
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}
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return rv;
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}
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int nas_eps_send_deactivate_bearer_context_request(mme_bearer_t *bearer)
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{
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int rv;
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ogs_pkbuf_t *s1apbuf = NULL;
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ogs_pkbuf_t *esmbuf = NULL;
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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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esmbuf = esm_build_deactivate_bearer_context_request(
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bearer, ESM_CAUSE_REGULAR_DEACTIVATION);
|
|
ogs_expect_or_return_val(esmbuf, OGS_ERROR);
|
|
|
|
s1apbuf = s1ap_build_e_rab_release_command(bearer, esmbuf,
|
|
S1AP_Cause_PR_nas, S1AP_CauseNas_normal_release);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
|
|
ogs_expect(rv == OGS_OK);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_bearer_resource_allocation_reject(
|
|
mme_ue_t *mme_ue, uint8_t pti, ogs_nas_esm_cause_t esm_cause)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *esmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
ogs_assert(pti != OGS_NAS_PROCEDURE_TRANSACTION_IDENTITY_UNASSIGNED);
|
|
|
|
esmbuf = esm_build_bearer_resource_allocation_reject(
|
|
mme_ue, pti, esm_cause);
|
|
ogs_expect_or_return_val(esmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, esmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_bearer_resource_modification_reject(
|
|
mme_ue_t *mme_ue, uint8_t pti, ogs_nas_esm_cause_t esm_cause)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *esmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
ogs_assert(pti != OGS_NAS_PROCEDURE_TRANSACTION_IDENTITY_UNASSIGNED);
|
|
|
|
esmbuf = esm_build_bearer_resource_modification_reject(
|
|
mme_ue, pti, esm_cause);
|
|
ogs_expect_or_return_val(esmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, esmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_tau_accept(
|
|
mme_ue_t *mme_ue, S1AP_ProcedureCode_t procedureCode)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *emmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
|
|
ogs_debug("[%s] Tracking area update accept", mme_ue->imsi_bcd);
|
|
|
|
emmbuf = emm_build_tau_accept(mme_ue);
|
|
ogs_expect_or_return_val(emmbuf, OGS_ERROR);
|
|
|
|
if (mme_ue->next.m_tmsi) {
|
|
CLEAR_MME_UE_TIMER(mme_ue->t3450);
|
|
mme_ue->t3450.pkbuf = ogs_pkbuf_copy(emmbuf);
|
|
ogs_expect_or_return_val(mme_ue->t3450.pkbuf, OGS_ERROR);
|
|
ogs_timer_start(mme_ue->t3450.timer,
|
|
mme_timer_cfg(MME_TIMER_T3450)->duration);
|
|
}
|
|
|
|
if (procedureCode == S1AP_ProcedureCode_id_InitialContextSetup) {
|
|
ogs_pkbuf_t *s1apbuf = NULL;
|
|
s1apbuf = s1ap_build_initial_context_setup_request(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(s1apbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_enb(mme_ue, s1apbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
} else if (procedureCode == S1AP_ProcedureCode_id_downlinkNASTransport) {
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
} else
|
|
ogs_assert_if_reached();
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_tau_reject(mme_ue_t *mme_ue, ogs_nas_emm_cause_t emm_cause)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *emmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
|
|
ogs_debug("[%s] Tracking area update reject", mme_ue->imsi_bcd);
|
|
|
|
/* Build TAU reject */
|
|
emmbuf = emm_build_tau_reject(emm_cause, mme_ue);
|
|
ogs_expect_or_return_val(emmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_service_reject(mme_ue_t *mme_ue,
|
|
ogs_nas_emm_cause_t emm_cause)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *emmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
|
|
ogs_debug("[%s] Service reject", mme_ue->imsi_bcd);
|
|
|
|
/* Build Service Reject */
|
|
emmbuf = emm_build_service_reject(emm_cause, mme_ue);
|
|
ogs_expect_or_return_val(emmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_cs_service_notification(mme_ue_t *mme_ue)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *emmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
|
|
ogs_debug("[%s] CS Service Notification", mme_ue->imsi_bcd);
|
|
|
|
emmbuf = emm_build_cs_service_notification(mme_ue);
|
|
ogs_expect_or_return_val(emmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|
|
|
|
int nas_eps_send_downlink_nas_transport(
|
|
mme_ue_t *mme_ue, uint8_t *buffer, uint8_t length)
|
|
{
|
|
int rv;
|
|
ogs_pkbuf_t *emmbuf = NULL;
|
|
|
|
ogs_assert(mme_ue);
|
|
ogs_assert(buffer);
|
|
ogs_assert(length);
|
|
|
|
ogs_debug("[%s] Downlink NAS transport", mme_ue->imsi_bcd);
|
|
|
|
emmbuf = emm_build_downlink_nas_transport(mme_ue, buffer, length);
|
|
ogs_expect_or_return_val(emmbuf, OGS_ERROR);
|
|
|
|
rv = nas_eps_send_to_downlink_nas_transport(mme_ue, emmbuf);
|
|
ogs_expect_or_return_val(rv == OGS_OK, rv);
|
|
|
|
return rv;
|
|
}
|