94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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*
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* srsLTE 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
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE 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 Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#ifndef SRSLTE_GTPC_H
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#define SRSLTE_GTPC_H
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#include "srslte/asn1/gtpc_msg.h"
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#include <stdint.h>
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namespace srslte {
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/*GTP-C Version*/
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const uint8_t GTPC_V2 = 2;
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/****************************************************************************
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* GTP-C v2 Header
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* Ref: 3GPP TS 29.274 v10.14.0 Section 5
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*
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* | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
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*
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* 1 | Version | P | T | S | S | S |
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* 2 | Message Type |
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* 3 | Length (1st Octet) |
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* 4 | Length (2nd Octet) |
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* m | If T=1, TEID (1st Octet) |
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* m+1 | If T=1, TEID (2nd Octet) |
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* m+2 | If T=1, TEID (3st Octet) |
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* m+3 | If T=1, TEID (4st Octet) |
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* n | Sequence |
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* n+1 | Sequence |
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* n+2 | Sequence |
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* n+3 | Spare |
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***************************************************************************/
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typedef struct gtpc_header {
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uint8_t version;
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bool piggyback;
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bool teid_present;
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uint8_t type;
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uint64_t teid;
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uint64_t sequence;
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} gtpc_header_t;
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/****************************************************************************
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* GTP-C v2 Payload
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* Ref: 3GPP TS 29.274 v10.14.0 Section 5
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*
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* Union that hold the different structures for the possible message types.
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***************************************************************************/
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typedef union gtpc_msg_choice {
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struct gtpc_create_session_request create_session_request;
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struct gtpc_create_session_response create_session_response;
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struct gtpc_modify_bearer_request modify_bearer_request;
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struct gtpc_modify_bearer_response modify_bearer_response;
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struct gtpc_release_access_bearers_request release_access_bearers_request;
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struct gtpc_release_access_bearers_response release_access_bearers_response;
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struct gtpc_delete_session_request delete_session_request;
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struct gtpc_delete_session_response delete_session_response;
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struct gtpc_downlink_data_notification downlink_data_notification;
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struct gtpc_downlink_data_notification_acknowledge downlink_data_notification_acknowledge;
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struct gtpc_downlink_data_notification_failure_indication downlink_data_notification_failure_indication;
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} gtpc_msg_choice_t;
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/****************************************************************************
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* GTP-C v2 Message
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* Ref: 3GPP TS 29.274 v10.14.0
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*
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* This is the main structure to represent a GTP-C message. It is composed
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* of one GTP-C header and one union of structures, which can hold
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* all the possible GTP-C messages
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***************************************************************************/
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typedef struct gtpc_pdu {
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struct gtpc_header header;
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union gtpc_msg_choice choice;
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} gtpc_pdu_t;
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} // namespace srslte
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#endif // SRSLTE_GTPC_H
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