forked from acouzens/open5gs
280 lines
11 KiB
C
280 lines
11 KiB
C
/*
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* Copyright (C) 2019,2020 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 "gsm-build.h"
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#undef OGS_LOG_DOMAIN
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#define OGS_LOG_DOMAIN __gsm_log_domain
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ogs_pkbuf_t *gsm_build_pdu_session_establishment_accept(smf_sess_t *sess)
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{
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ogs_pkbuf_t *pkbuf = NULL;
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smf_bearer_t *qos_flow = NULL;
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ogs_nas_5gs_message_t message;
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ogs_nas_5gs_pdu_session_establishment_accept_t *
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pdu_session_establishment_accept =
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&message.gsm.pdu_session_establishment_accept;
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ogs_nas_pdu_session_type_t *selected_pdu_session_type = NULL;
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ogs_nas_qos_rules_t *authorized_qos_rules = NULL;
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ogs_nas_session_ambr_t *session_ambr = NULL;
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ogs_nas_5gsm_cause_t *gsm_cause = NULL;
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ogs_nas_pdu_address_t *pdu_address = NULL;
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ogs_nas_s_nssai_t *nas_s_nssai = NULL;
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ogs_nas_qos_flow_descriptions_t *authorized_qos_flow_descriptions = NULL;
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ogs_nas_extended_protocol_configuration_options_t
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*extended_protocol_configuration_options = NULL;
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ogs_nas_dnn_t *dnn = NULL;
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ogs_nas_qos_rule_t qos_rule[OGS_NAS_MAX_NUM_OF_QOS_RULE];
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ogs_nas_qos_flow_description_t qos_flow_description;
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uint8_t pco_buf[OGS_MAX_PCO_LEN];
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int16_t pco_len;
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selected_pdu_session_type = &pdu_session_establishment_accept->
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selected_pdu_session_type;
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ogs_assert(selected_pdu_session_type);
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authorized_qos_rules = &pdu_session_establishment_accept->
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authorized_qos_rules;
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ogs_assert(authorized_qos_rules);
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session_ambr = &pdu_session_establishment_accept->session_ambr;
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ogs_assert(session_ambr);
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pdu_address = &pdu_session_establishment_accept->pdu_address;
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ogs_assert(pdu_address);
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gsm_cause = &pdu_session_establishment_accept->gsm_cause;
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ogs_assert(gsm_cause);
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nas_s_nssai = &pdu_session_establishment_accept->s_nssai;
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ogs_assert(nas_s_nssai);
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authorized_qos_flow_descriptions =
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&pdu_session_establishment_accept->authorized_qos_flow_descriptions;
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ogs_assert(authorized_qos_flow_descriptions);
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extended_protocol_configuration_options =
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&pdu_session_establishment_accept->
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extended_protocol_configuration_options;
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ogs_assert(extended_protocol_configuration_options);
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dnn = &pdu_session_establishment_accept->dnn;
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ogs_assert(dnn);
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ogs_assert(sess);
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qos_flow = smf_default_bearer_in_sess(sess);
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ogs_assert(qos_flow);
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memset(&message, 0, sizeof(message));
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message.gsm.h.extended_protocol_discriminator =
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OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GSM;
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message.gsm.h.pdu_session_identity = sess->psi;
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message.gsm.h.procedure_transaction_identity = sess->pti;
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message.gsm.h.message_type = OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT;
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selected_pdu_session_type->type = sess->pdn.ssc_mode;
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selected_pdu_session_type->value = sess->pdn.pdn_type;
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/*
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* TS23.501
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* 5.7.1.3 QoS Rules
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*
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* A default QoS rule is required to be sent to the UE for every PDU
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* Session establishment and it is associated with a QoS Flow. For IP type
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* PDU Session or Ethernet type PDU Session, the default QoS rule is
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* the only QoS rule of a PDU Session which may contain a Packet Filter
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* Set that allows all UL packets, and in this case, the highest
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* precedence value shall be used for the QoS rule.
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*
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* As long as the default QoS rule does not contain a Packet Filter Set or
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* contains a Packet Filter Set that allows all UL packets, Reflective QoS
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* should not be applied for the QoS Flow which the default QoS rule is
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* associated with and the RQA should not be sent for this QoS Flow.
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*/
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memset(qos_rule, 0, sizeof(qos_rule));
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qos_rule[0].identifier = 1;
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qos_rule[0].length = 6;
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qos_rule[0].code = OGS_NAS_QOS_CODE_CREATE_NEW_QOS_RULE;
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qos_rule[0].DQR_bit = 1;
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qos_rule[0].num_of_packet_filter = 1;
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qos_rule[0].pf[0].direction = OGS_NAS_QOS_DIRECTION_UPLINK;
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qos_rule[0].pf[0].pf_identifier = 1;
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qos_rule[0].pf[0].length = 1;
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qos_rule[0].pf[0].num_of_component = 1;
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qos_rule[0].pf[0].component[0].type = OGS_PACKET_FILTER_MATCH_ALL;
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/*
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* TS23.501
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* 5.7.1.9 Precedence Value
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*
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* The QoS rule precedence value and the PDR precedence value determine
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* the order in which a QoS rule or a PDR, respectively, shall be evaluated.
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* The evaluation of the QoS rules or PDRs is performed in increasing order
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* of their precedence value.
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*/
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qos_rule[0].precedence = 255; /* lowest precedence */
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qos_rule[0].flow.segregation = 0;
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qos_rule[0].flow.identifier = qos_flow->qfi;
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ogs_nas_build_qos_rules(authorized_qos_rules, qos_rule, 1);
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/* Session-AMBR */
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session_ambr->length = 6;
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ogs_nas_bitrate_from_uint64(
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&session_ambr->downlink, sess->pdn.ambr.downlink);
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ogs_nas_bitrate_from_uint64(
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&session_ambr->uplink, sess->pdn.ambr.uplink);
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/* PDU Address */
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_PDU_ADDRESS_PRESENT;
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pdu_address->pdn_type = sess->pdn.paa.pdn_type;
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if (pdu_address->pdn_type == OGS_PDU_SESSION_TYPE_IPV4) {
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pdu_address->addr = sess->pdn.paa.addr;
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pdu_address->length = OGS_NAS_PDU_ADDRESS_IPV4_LEN;
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} else if (pdu_address->pdn_type == OGS_PDU_SESSION_TYPE_IPV6) {
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memcpy(pdu_address->addr6,
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sess->pdn.paa.addr6+(OGS_IPV6_LEN>>1), OGS_IPV6_LEN>>1);
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pdu_address->length = OGS_NAS_PDU_ADDRESS_IPV6_LEN;
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} else if (pdu_address->pdn_type == OGS_PDU_SESSION_TYPE_IPV4V6) {
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pdu_address->both.addr = sess->pdn.paa.both.addr;
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memcpy(pdu_address->both.addr6,
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sess->pdn.paa.both.addr6+(OGS_IPV6_LEN>>1), OGS_IPV6_LEN>>1);
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pdu_address->length = OGS_NAS_PDU_ADDRESS_IPV4V6_LEN;
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} else {
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ogs_error("Unexpected PDN Type %u", pdu_address->pdn_type);
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return NULL;
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}
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/* GSM cause */
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if (sess->ue_pdu_session_type == OGS_PDU_SESSION_TYPE_IPV4V6) {
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if (pdu_address->pdn_type == OGS_PDU_SESSION_TYPE_IPV4) {
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_5GSM_CAUSE_PRESENT;
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*gsm_cause = OGS_5GSM_CAUSE_PDU_SESSION_TYPE_IPV4_ONLY_ALLOWED;
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} else if (pdu_address->pdn_type == OGS_PDU_SESSION_TYPE_IPV6) {
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_5GSM_CAUSE_PRESENT;
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*gsm_cause = OGS_5GSM_CAUSE_PDU_SESSION_TYPE_IPV6_ONLY_ALLOWED;
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}
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}
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/* S-NSSAI */
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_S_NSSAI_PRESENT;
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ogs_nas_build_s_nssai(nas_s_nssai, &sess->s_nssai);
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/* QoS flow descriptions */
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memset(&qos_flow_description, 0, sizeof(qos_flow_description));
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qos_flow_description.identifier = qos_flow->qfi;
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qos_flow_description.code = OGS_NAS_CREATE_NEW_QOS_FLOW_DESCRIPTION;
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qos_flow_description.E = 1;
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qos_flow_description.num_of_parameter = 1;
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qos_flow_description.param[0].identifier =
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OGS_NAX_QOS_FLOW_PARAMETER_ID_5QI;
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qos_flow_description.param[0].len = 1;
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qos_flow_description.param[0].content[0] = sess->pdn.qos.qci;
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_AUTHORIZED_QOS_FLOW_DESCRIPTIONS_PRESENT;
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authorized_qos_flow_descriptions->length = 6;
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authorized_qos_flow_descriptions->buffer = &qos_flow_description;
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/* Extended protocol configuration options */
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if (sess->nas.ue_pco.buffer && sess->nas.ue_pco.length) {
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pco_len = smf_pco_build(pco_buf,
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sess->nas.ue_pco.buffer, sess->nas.ue_pco.length);
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ogs_assert(pco_len > 0);
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_EXTENDED_PROTOCOL_CONFIGURATION_OPTIONS_PRESENT;
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extended_protocol_configuration_options->buffer = pco_buf;
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extended_protocol_configuration_options->length = pco_len;
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}
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/* DNN */
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pdu_session_establishment_accept->presencemask |=
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OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_ACCEPT_DNN_PRESENT;
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dnn->length = strlen(sess->pdn.dnn);
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ogs_cpystrn(dnn->value, sess->pdn.dnn,
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ogs_min(dnn->length, OGS_MAX_DNN_LEN) + 1);
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pkbuf = ogs_nas_5gs_plain_encode(&message);
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ogs_assert(pkbuf);
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ogs_free(authorized_qos_rules->buffer);
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return pkbuf;
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}
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ogs_pkbuf_t *gsm_build_pdu_session_establishment_reject(
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smf_sess_t *sess, ogs_nas_5gsm_cause_t gsm_cause)
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{
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ogs_nas_5gs_message_t message;
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ogs_nas_5gs_pdu_session_establishment_reject_t *
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pdu_session_establishment_reject =
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&message.gsm.pdu_session_establishment_reject;
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memset(&message, 0, sizeof(message));
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message.gsm.h.extended_protocol_discriminator =
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OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GSM;
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message.gsm.h.pdu_session_identity = sess->psi;
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message.gsm.h.procedure_transaction_identity = sess->pti;
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message.gsm.h.message_type = OGS_NAS_5GS_PDU_SESSION_ESTABLISHMENT_REJECT;
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pdu_session_establishment_reject->gsm_cause = gsm_cause;
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return ogs_nas_5gs_plain_encode(&message);
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}
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ogs_pkbuf_t *gsm_build_pdu_session_release_command(
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smf_sess_t *sess, ogs_nas_5gsm_cause_t gsm_cause)
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{
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ogs_nas_5gs_message_t message;
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ogs_nas_5gs_pdu_session_release_command_t *pdu_session_release_command =
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&message.gsm.pdu_session_release_command;
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memset(&message, 0, sizeof(message));
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message.gsm.h.extended_protocol_discriminator =
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OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GSM;
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message.gsm.h.pdu_session_identity = sess->psi;
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message.gsm.h.procedure_transaction_identity = sess->pti;
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message.gsm.h.message_type = OGS_NAS_5GS_PDU_SESSION_RELEASE_COMMAND;
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pdu_session_release_command->gsm_cause = gsm_cause;
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return ogs_nas_5gs_plain_encode(&message);
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}
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ogs_pkbuf_t *gsm_build_pdu_session_release_reject(
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smf_sess_t *sess, ogs_nas_5gsm_cause_t gsm_cause)
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{
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ogs_nas_5gs_message_t message;
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ogs_nas_5gs_pdu_session_release_reject_t *
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pdu_session_release_reject = &message.gsm.pdu_session_release_reject;
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memset(&message, 0, sizeof(message));
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message.gsm.h.extended_protocol_discriminator =
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OGS_NAS_EXTENDED_PROTOCOL_DISCRIMINATOR_5GSM;
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message.gsm.h.pdu_session_identity = sess->psi;
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message.gsm.h.procedure_transaction_identity = sess->pti;
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message.gsm.h.message_type = OGS_NAS_5GS_PDU_SESSION_RELEASE_REJECT;
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pdu_session_release_reject->gsm_cause = gsm_cause;
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return ogs_nas_5gs_plain_encode(&message);
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}
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