mirror of https://github.com/pvnis/srsRAN_4G.git
First attempt at MAC pcap support
Paul Sutton
10 years ago
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5109498353
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d1ed052a97
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/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 The srsLTE Developers. See the
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* COPYRIGHT file at the top-level directory of this distribution.
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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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* 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 UEPCAP_H
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#define UEPCAP_H
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#include <stdio.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#define MAC_LTE_DLT 147
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/* This structure gets written to the start of the file */
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typedef struct pcap_hdr_s {
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unsigned int magic_number; /* magic number */
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unsigned short version_major; /* major version number */
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unsigned short version_minor; /* minor version number */
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unsigned int thiszone; /* GMT to local correction */
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unsigned int sigfigs; /* accuracy of timestamps */
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unsigned int snaplen; /* max length of captured packets, in octets */
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unsigned int network; /* data link type */
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} pcap_hdr_t;
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/* This structure precedes each packet */
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typedef struct pcaprec_hdr_s {
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unsigned int ts_sec; /* timestamp seconds */
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unsigned int ts_usec; /* timestamp microseconds */
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unsigned int incl_len; /* number of octets of packet saved in file */
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unsigned int orig_len; /* actual length of packet */
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} pcaprec_hdr_t;
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/* radioType */
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#define FDD_RADIO 1
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#define TDD_RADIO 2
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/* Direction */
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#define DIRECTION_UPLINK 0
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#define DIRECTION_DOWNLINK 1
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/* rntiType */
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#define NO_RNTI 0 /* Used for BCH-BCH */
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#define P_RNTI 1
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#define RA_RNTI 2
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#define C_RNTI 3
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#define SI_RNTI 4
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#define SPS_RNTI 5
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#define M_RNTI 6
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#define MAC_LTE_START_STRING "mac-lte"
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#define MAC_LTE_RNTI_TAG 0x02
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/* 2 bytes, network order */
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#define MAC_LTE_UEID_TAG 0x03
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/* 2 bytes, network order */
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#define MAC_LTE_SUBFRAME_TAG 0x04
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/* 2 bytes, network order */
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#define MAC_LTE_PREDFINED_DATA_TAG 0x05
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/* 1 byte */
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#define MAC_LTE_RETX_TAG 0x06
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/* 1 byte */
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#define MAC_LTE_CRC_STATUS_TAG 0x07
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/* 1 byte */
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/* MAC PDU. Following this tag comes the actual MAC PDU (there is no length, the PDU
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continues until the end of the frame) */
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#define MAC_LTE_PAYLOAD_TAG 0x01
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/* Context information for every MAC PDU that will be logged */
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typedef struct MAC_Context_Info_t {
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unsigned short radioType;
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unsigned char direction;
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unsigned char rntiType;
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unsigned short rnti;
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unsigned short ueid;
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unsigned char isRetx;
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unsigned char crcStatusOK;
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unsigned short sysFrameNumber;
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unsigned short subFrameNumber;
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} MAC_Context_Info_t;
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/**************************************************************************/
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/* API functions for opening/writing/closing MAC-LTE PCAP files */
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/* Open the file and write file header */
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inline FILE *MAC_LTE_PCAP_Open(const char *fileName)
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{
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pcap_hdr_t file_header =
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{
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0xa1b2c3d4, /* magic number */
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2, 4, /* version number is 2.4 */
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0, /* timezone */
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0, /* sigfigs - apparently all tools do this */
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65535, /* snaplen - this should be long enough */
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MAC_LTE_DLT /* Data Link Type (DLT). Set as unused value 147 for now */
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};
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FILE *fd = fopen(fileName, "w");
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if (fd == NULL) {
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printf("Failed to open file \"%s\" for writing\n", fileName);
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return NULL;
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}
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/* Write the file header */
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fwrite(&file_header, sizeof(pcap_hdr_t), 1, fd);
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return fd;
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}
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/* Write an individual PDU (PCAP packet header + mac-context + mac-pdu) */
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inline int MAC_LTE_PCAP_WritePDU(FILE *fd, MAC_Context_Info_t *context,
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const unsigned char *PDU, unsigned int length)
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{
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pcaprec_hdr_t packet_header;
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char context_header[256];
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int offset = 0;
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unsigned short tmp16;
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/* Can't write if file wasn't successfully opened */
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if (fd == NULL) {
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printf("Error: Can't write to empty file handle\n");
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return 0;
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}
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/*****************************************************************/
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/* Context information (same as written by UDP heuristic clients */
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context_header[offset++] = context->radioType;
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context_header[offset++] = context->direction;
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context_header[offset++] = context->rntiType;
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/* RNTI */
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context_header[offset++] = MAC_LTE_RNTI_TAG;
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tmp16 = htons(context->rnti);
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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/* UEId */
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context_header[offset++] = MAC_LTE_UEID_TAG;
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tmp16 = htons(context->ueid);
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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/* Subframe number */
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context_header[offset++] = MAC_LTE_SUBFRAME_TAG;
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tmp16 = htons(context->subFrameNumber);
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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/* CRC Status */
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context_header[offset++] = MAC_LTE_CRC_STATUS_TAG;
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context_header[offset++] = context->crcStatusOK;
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/* Data tag immediately preceding PDU */
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context_header[offset++] = MAC_LTE_PAYLOAD_TAG;
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/****************************************************************/
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/* PCAP Header */
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struct timeval t;
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gettimeofday(&t, NULL);
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packet_header.ts_sec = t.tv_sec;
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packet_header.ts_usec = t.tv_usec;
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packet_header.incl_len = offset + length;
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packet_header.orig_len = offset + length;
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/***************************************************************/
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/* Now write everything to the file */
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fwrite(&packet_header, sizeof(pcaprec_hdr_t), 1, fd);
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fwrite(context_header, 1, offset, fd);
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fwrite(PDU, 1, length, fd);
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return 1;
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}
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/* Close the PCAP file */
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inline void MAC_LTE_PCAP_Close(FILE *fd)
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{
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fclose(fd);
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}
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#endif /* UEPCAP_H */
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