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549 lines
17 KiB
C
549 lines
17 KiB
C
/*
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* Copyright 2013-2019 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_PCAP_H
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#define SRSLTE_PCAP_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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#define NAS_LTE_DLT 148
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#define UDP_DLT 149 // UDP needs to be selected as protocol
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#define S1AP_LTE_DLT 150
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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_PAYLOAD_TAG 0x01
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#define MAC_LTE_RNTI_TAG 0x02
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#define MAC_LTE_UEID_TAG 0x03
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#define MAC_LTE_FRAME_SUBFRAME_TAG 0x04
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#define MAC_LTE_PREDFINED_DATA_TAG 0x05
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#define MAC_LTE_RETX_TAG 0x06
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#define MAC_LTE_CRC_STATUS_TAG 0x07
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#define MAC_LTE_NB_MODE_TAG 0x0F
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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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unsigned char nbiotMode;
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} MAC_Context_Info_t;
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/* Context information for every NAS PDU that will be logged */
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typedef struct NAS_Context_Info_s {
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// No Context yet
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} NAS_Context_Info_t;
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#define MAC_NR_START_STRING "mac-nr"
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#define MAC_NR_PHR_TYPE2_OTHERCELL_TAG 0x05
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#define MAC_NR_HARQID 0x06
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/* Context information for every MAC NR PDU that will be logged */
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typedef struct {
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uint8_t radioType;
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uint8_t direction;
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uint8_t rntiType;
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uint16_t rnti;
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uint16_t ueid;
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uint8_t harqid;
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uint8_t phr_type2_othercell;
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uint16_t system_frame_number;
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uint8_t sub_frame_number;
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uint16_t length;
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} mac_nr_context_info_t;
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/* RLC-LTE disector */
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/* rlcMode */
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#define RLC_TM_MODE 1
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#define RLC_UM_MODE 2
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#define RLC_AM_MODE 4
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#define RLC_PREDEF 8
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/* priority ? */
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/* channelType */
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#define CHANNEL_TYPE_CCCH 1
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#define CHANNEL_TYPE_BCCH_BCH 2
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#define CHANNEL_TYPE_PCCH 3
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#define CHANNEL_TYPE_SRB 4
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#define CHANNEL_TYPE_DRB 5
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#define CHANNEL_TYPE_BCCH_DL_SCH 6
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#define CHANNEL_TYPE_MCCH 7
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#define CHANNEL_TYPE_MTCH 8
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/* sequenceNumberLength */
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#define UM_SN_LENGTH_5_BITS 5
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#define UM_SN_LENGTH_10_BITS 10
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#define AM_SN_LENGTH_10_BITS 10
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#define AM_SN_LENGTH_16_BITS 16
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/* Narrow band mode */
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typedef enum {
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rlc_no_nb_mode = 0,
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rlc_nb_mode = 1
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} rlc_lte_nb_mode;
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/* Context information for every RLC PDU that will be logged */
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typedef struct {
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unsigned char rlcMode;
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unsigned char direction;
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unsigned char priority;
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unsigned char sequenceNumberLength;
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unsigned short ueid;
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unsigned short channelType;
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unsigned short channelId; /* for SRB: 1=SRB1, 2=SRB2, 3=SRB1bis; for DRB: DRB ID */
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unsigned short pduLength;
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bool extendedLiField;
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rlc_lte_nb_mode nbMode;
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} RLC_Context_Info_t;
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// See Wireshark's packet-rlc-lte.h for details
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#define RLC_LTE_START_STRING "rlc-lte"
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#define RLC_LTE_SN_LENGTH_TAG 0x02
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#define RLC_LTE_DIRECTION_TAG 0x03
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#define RLC_LTE_PRIORITY_TAG 0x04
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#define RLC_LTE_UEID_TAG 0x05
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#define RLC_LTE_CHANNEL_TYPE_TAG 0x06
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#define RLC_LTE_CHANNEL_ID_TAG 0x07
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#define RLC_LTE_EXT_LI_FIELD_TAG 0x08
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#define RLC_LTE_NB_MODE_TAG 0x09
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#define RLC_LTE_PAYLOAD_TAG 0x01
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/* Context information for every S1AP PDU that will be logged */
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typedef struct S1AP_Context_Info_s {
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// No Context yet
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} S1AP_Context_Info_t;
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/**************************************************************************
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* API functions for opening/closing LTE PCAP files *
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**************************************************************************/
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/* Open the file and write file header */
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inline FILE *LTE_PCAP_Open(uint32_t DLT, 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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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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/* Close the PCAP file */
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inline void LTE_PCAP_Close(FILE *fd)
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{
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if(fd)
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fclose(fd);
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}
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/**************************************************************************
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* API functions for writing MAC-LTE PCAP files *
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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 LTE_PCAP_MAC_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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uint16_t 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 and System Frame Number */
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/* SFN is stored in 12 MSB and SF in 4 LSB */
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context_header[offset++] = MAC_LTE_FRAME_SUBFRAME_TAG;
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tmp16 = (context->sysFrameNumber << 4) | context->subFrameNumber;
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tmp16 = htons(tmp16);
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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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/* NB-IoT mode tag */
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context_header[offset++] = MAC_LTE_NB_MODE_TAG;
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context_header[offset++] = context->nbiotMode;
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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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/**************************************************************************
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* API functions for writing NAS-EPS PCAP files *
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**************************************************************************/
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/* Write an individual PDU (PCAP packet header + nas-context + nas-pdu) */
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inline int LTE_PCAP_NAS_WritePDU(FILE *fd, NAS_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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/* 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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/* 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 = length;
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packet_header.orig_len = 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(PDU, 1, length, fd);
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return 1;
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}
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/**************************************************************************
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* API functions for writing RLC-LTE PCAP files *
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**************************************************************************/
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/* Write an individual RLC PDU (PCAP packet header + UDP header + rlc-context + rlc-pdu) */
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inline int LTE_PCAP_RLC_WritePDU(FILE *fd, RLC_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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uint16_t 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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// Add dummy UDP header, start with src and dest port
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context_header[offset++] = 0xde;
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context_header[offset++] = 0xad;
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context_header[offset++] = 0xbe;
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context_header[offset++] = 0xef;
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// length
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tmp16 = length + 12;
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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// dummy CRC
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context_header[offset++] = 0xde;
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context_header[offset++] = 0xad;
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// Start magic string
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memcpy(&context_header[offset], RLC_LTE_START_STRING, strlen(RLC_LTE_START_STRING));
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offset += strlen(RLC_LTE_START_STRING);
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// Fixed field RLC mode
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context_header[offset++] = context->rlcMode;
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// Conditional fields
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if (context->rlcMode == RLC_UM_MODE) {
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context_header[offset++] = RLC_LTE_SN_LENGTH_TAG;
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context_header[offset++] = context->sequenceNumberLength;
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}
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// Optional fields
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context_header[offset++] = RLC_LTE_DIRECTION_TAG;
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context_header[offset++] = context->direction;
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context_header[offset++] = RLC_LTE_PRIORITY_TAG;
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context_header[offset++] = context->priority;
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context_header[offset++] = RLC_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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context_header[offset++] = RLC_LTE_CHANNEL_TYPE_TAG;
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tmp16 = htons(context->channelType);
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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context_header[offset++] = RLC_LTE_CHANNEL_ID_TAG;
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tmp16 = htons(context->channelId);
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memcpy(context_header+offset, &tmp16, 2);
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offset += 2;
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// Now the actual PDU
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context_header[offset++] = RLC_LTE_PAYLOAD_TAG;
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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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// Write everything to 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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/**************************************************************************
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* API functions for writing S1AP PCAP files *
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**************************************************************************/
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/* Write an individual PDU (PCAP packet header + s1ap-context + s1ap-pdu) */
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inline int LTE_PCAP_S1AP_WritePDU(FILE *fd, S1AP_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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/* 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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/* 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 = length;
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packet_header.orig_len = 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(PDU, 1, length, fd);
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return 1;
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}
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/**************************************************************************
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* API functions for writing MAC-NR PCAP files *
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**************************************************************************/
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/* Write an individual NR MAC PDU (PCAP packet header + UDP header + nr-mac-context + mac-pdu) */
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inline int NR_PCAP_MAC_WritePDU(FILE* fd, mac_nr_context_info_t* context, const unsigned char* PDU, unsigned int length)
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{
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char context_header[256] = {};
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int offset = 0;
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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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// Add dummy UDP header, start with src and dest port
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context_header[offset++] = 0xde;
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context_header[offset++] = 0xad;
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context_header[offset++] = 0xbe;
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context_header[offset++] = 0xef;
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// length
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uint16_t tmp16 = htons(length + 31);
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memcpy(context_header + offset, &tmp16, 2);
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offset += 2;
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// dummy CRC
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context_header[offset++] = 0xde;
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context_header[offset++] = 0xad;
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// Start magic string
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memcpy(&context_header[offset], MAC_NR_START_STRING, strlen(MAC_NR_START_STRING));
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offset += strlen(MAC_NR_START_STRING);
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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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/* HARQID */
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context_header[offset++] = MAC_NR_HARQID;
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context_header[offset++] = context->harqid;
|
|
|
|
/* PHR Type2 other cell */
|
|
context_header[offset++] = MAC_NR_PHR_TYPE2_OTHERCELL_TAG;
|
|
context_header[offset++] = context->phr_type2_othercell;
|
|
|
|
/* Subframe Number and System Frame Number */
|
|
/* SFN is stored in 12 MSB and SF in 4 LSB */
|
|
context_header[offset++] = MAC_LTE_FRAME_SUBFRAME_TAG;
|
|
tmp16 = (context->system_frame_number << 4) | context->sub_frame_number;
|
|
tmp16 = htons(tmp16);
|
|
memcpy(context_header + offset, &tmp16, 2);
|
|
offset += 2;
|
|
|
|
/* Data tag immediately preceding PDU */
|
|
context_header[offset++] = MAC_LTE_PAYLOAD_TAG;
|
|
|
|
/****************************************************************/
|
|
/* PCAP Header */
|
|
struct timeval t;
|
|
gettimeofday(&t, NULL);
|
|
pcaprec_hdr_t packet_header;
|
|
packet_header.ts_sec = t.tv_sec;
|
|
packet_header.ts_usec = t.tv_usec;
|
|
packet_header.incl_len = offset + length;
|
|
packet_header.orig_len = offset + length;
|
|
|
|
/***************************************************************/
|
|
/* Now write everything to the file */
|
|
fwrite(&packet_header, sizeof(pcaprec_hdr_t), 1, fd);
|
|
fwrite(context_header, 1, offset, fd);
|
|
fwrite(PDU, 1, length, fd);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#endif // SRSLTE_PCAP_H
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