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111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#ifndef SRSLTE_GTPU_H
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#define SRSLTE_GTPU_H
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#include "srslte/common/byte_buffer.h"
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#include "srslte/common/common.h"
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#include "srslte/srslog/srslog.h"
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#include <stdint.h>
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namespace srslte {
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/****************************************************************************
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* GTPU Header
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* Ref: 3GPP TS 29.281 v10.1.0 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 |PT | * | E | S |PN |
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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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* 5 | TEID (1st Octet) |
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* 6 | TEID (2nd Octet) |
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* 7 | TEID (3rd Octet) |
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* 8 | TEID (4th Octet) |
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* 9 | Seq Number (1st Octet) |
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* 10 | Seq Number (2st Octet) |
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* 11 | N-PDU |
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* 12 | Next Extension Header Type |
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***************************************************************************/
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#define GTPU_BASE_HEADER_LEN 8
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#define GTPU_EXTENDED_HEADER_LEN 12
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#define GTPU_FLAGS_VERSION_MASK 0xE0
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#define GTPU_FLAGS_VERSION_V1 0x20
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#define GTPU_FLAGS_GTP_PRIME_PROTOCOL 0x00
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#define GTPU_FLAGS_GTP_PROTOCOL 0x10
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#define GTPU_FLAGS_EXTENDED_HDR 0x04
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#define GTPU_FLAGS_SEQUENCE 0x02
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#define GTPU_FLAGS_PACKET_NUM 0x01
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#define GTPU_MSG_ECHO_REQUEST 1
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#define GTPU_MSG_ECHO_RESPONSE 2
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#define GTPU_MSG_ERROR_INDICATION 26
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#define GTPU_MSG_SUPPORTED_EXTENSION_HEADERS_NOTIFICATION 31
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#define GTPU_MSG_END_MARKER 254
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#define GTPU_MSG_DATA_PDU 255
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#define GTPU_EXT_HEADER_PDCP_PDU_NUMBER 0b11000000
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struct gtpu_header_t {
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uint8_t flags = 0;
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uint8_t message_type = 0;
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uint16_t length = 0;
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uint32_t teid = 0;
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uint16_t seq_number = 0;
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uint8_t n_pdu = 0;
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uint8_t next_ext_hdr_type = 0;
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std::vector<uint8_t> ext_buffer;
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};
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bool gtpu_read_header(srslte::byte_buffer_t* pdu, gtpu_header_t* header, srslog::basic_logger& logger);
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bool gtpu_write_header(gtpu_header_t* header, srslte::byte_buffer_t* pdu, srslog::basic_logger& logger);
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void gtpu_ntoa(fmt::memory_buffer& buffer, uint32_t addr);
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inline bool gtpu_supported_flags_check(gtpu_header_t* header, srslog::basic_logger& logger)
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{
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// flags
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if ((header->flags & GTPU_FLAGS_VERSION_MASK) != GTPU_FLAGS_VERSION_V1) {
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logger.error("gtpu_header - Unhandled GTP-U Version. Flags: 0x%x", header->flags);
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return false;
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}
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if (!(header->flags & GTPU_FLAGS_GTP_PROTOCOL)) {
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logger.error("gtpu_header - Unhandled Protocol Type. Flags: 0x%x", header->flags);
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return false;
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}
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if (header->flags & GTPU_FLAGS_PACKET_NUM) {
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logger.error("gtpu_header - Unhandled Packet Number. Flags: 0x%x", header->flags);
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return false;
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}
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return true;
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}
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inline bool gtpu_supported_msg_type_check(gtpu_header_t* header, srslog::basic_logger& logger)
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{
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// msg_tpye
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if (header->message_type != GTPU_MSG_DATA_PDU && header->message_type != GTPU_MSG_ECHO_REQUEST &&
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header->message_type != GTPU_MSG_ECHO_RESPONSE && header->message_type != GTPU_MSG_ERROR_INDICATION &&
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header->message_type != GTPU_MSG_END_MARKER) {
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logger.error("gtpu_header - Unhandled message type: 0x%x", header->message_type);
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return false;
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}
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return true;
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}
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} // namespace srslte
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#endif
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