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151 lines
4.3 KiB
C++
151 lines
4.3 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2017 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsUE 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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* srsUE 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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#include "srslte/upper/gtpu.h"
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#include "srslte/common/int_helpers.h"
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namespace srslte {
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/****************************************************************************
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* Header pack/unpack helper functions
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* Ref: 3GPP TS 29.281 v10.1.0 Section 5
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***************************************************************************/
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bool gtpu_write_header(gtpu_header_t *header, srslte::byte_buffer_t *pdu, srslte::log *gtpu_log)
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{
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//flags
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if(!gtpu_supported_flags_check(header,gtpu_log)){
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gtpu_log->error("gtpu_write_header - Unhandled GTP-U Flags. Flags: 0x%x\n", header->flags);
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return false;
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}
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//msg type
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if(!gtpu_supported_msg_type_check(header,gtpu_log)){
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gtpu_log->error("gtpu_write_header - Unhandled GTP-U Message Type. Message Type: 0x%x\n", header->message_type);
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return false;
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}
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//If E, S or PN are set, the header is longer
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if (header->flags & (GTPU_FLAGS_EXTENDED_HDR | GTPU_FLAGS_SEQUENCE | GTPU_FLAGS_PACKET_NUM)) {
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if(pdu->get_headroom() < GTPU_EXTENDED_HEADER_LEN) {
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gtpu_log->error("gtpu_write_header - No room in PDU for header\n");
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return false;
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}
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pdu->msg -= GTPU_EXTENDED_HEADER_LEN;
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pdu->N_bytes += GTPU_EXTENDED_HEADER_LEN;
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} else {
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if(pdu->get_headroom() < GTPU_BASE_HEADER_LEN) {
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gtpu_log->error("gtpu_write_header - No room in PDU for header\n");
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return false;
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}
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pdu->msg -= GTPU_BASE_HEADER_LEN;
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pdu->N_bytes += GTPU_BASE_HEADER_LEN;
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}
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//write mandatory fields
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uint8_t *ptr = pdu->msg;
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*ptr = header->flags;
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ptr++;
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*ptr = header->message_type;
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ptr++;
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uint16_to_uint8(header->length, ptr);
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ptr += 2;
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uint32_to_uint8(header->teid, ptr);
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//write optional fields, if E, S or PN are set.
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if (header->flags & (GTPU_FLAGS_EXTENDED_HDR | GTPU_FLAGS_SEQUENCE | GTPU_FLAGS_PACKET_NUM)) {
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//S
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if (header->flags & GTPU_FLAGS_SEQUENCE ) {
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uint16_to_uint8(header->seq_number, ptr);
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} else {
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uint16_to_uint8(0, ptr);
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}
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ptr+=2;
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//PN
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if (header->flags & GTPU_FLAGS_PACKET_NUM ) {
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*ptr = header->n_pdu;
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} else {
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header->n_pdu = 0;
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}
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ptr++;
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//E
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if (header->flags & GTPU_FLAGS_EXTENDED_HDR ) {
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*ptr = header->next_ext_hdr_type;
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} else {
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*ptr = 0;
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}
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ptr++;
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}
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return true;
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}
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bool gtpu_read_header(srslte::byte_buffer_t *pdu, gtpu_header_t *header, srslte::log *gtpu_log)
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{
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uint8_t *ptr = pdu->msg;
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header->flags = *ptr;
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ptr++;
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header->message_type = *ptr;
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ptr++;
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uint8_to_uint16(ptr, &header->length);
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ptr += 2;
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uint8_to_uint32(ptr, &header->teid);
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//flags
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if(!gtpu_supported_flags_check(header,gtpu_log)){
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gtpu_log->error("gtpu_read_header - Unhandled GTP-U Flags. Flags: 0x%x\n", header->flags);
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return false;
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}
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//message_type
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if(!gtpu_supported_msg_type_check(header,gtpu_log)){
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gtpu_log->error("gtpu_read_header - Unhandled GTP-U Message Type. Flags: 0x%x\n", header->message_type);
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return false;
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}
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//If E, S or PN are set, header is longer
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if (header->flags & (GTPU_FLAGS_EXTENDED_HDR | GTPU_FLAGS_SEQUENCE | GTPU_FLAGS_PACKET_NUM)) {
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pdu->msg += GTPU_EXTENDED_HEADER_LEN;
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pdu->N_bytes -= GTPU_EXTENDED_HEADER_LEN;
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uint8_to_uint16(ptr, &header->seq_number);
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ptr+=2;
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header->n_pdu = *ptr;
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ptr++;
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header->next_ext_hdr_type = *ptr;
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ptr++;
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} else {
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pdu->msg += GTPU_BASE_HEADER_LEN;
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pdu->N_bytes -= GTPU_BASE_HEADER_LEN;
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}
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return true;
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}
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} // namespace srslte
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