82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
#ifndef _GSMTAP_H
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#define _GSMTAP_H
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/* gsmtap header, pseudo-header in front of the actua GSM payload*/
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#include <sys/types.h>
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#ifdef __linux__
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# include <arpa/inet.h>
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#endif
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#define GSMTAP_VERSION 0x01
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#define GSMTAP_TYPE_UM 0x01 /* A Layer 2 MAC block (23 bytes) */
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#define GSMTAP_TYPE_ABIS 0x02
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#define GSMTAP_TYPE_UM_BURST 0x03 /* raw burst bits */
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#define GSMTAP_BURST_UNKNOWN 0x00
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#define GSMTAP_BURST_FCCH 0x01
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#define GSMTAP_BURST_PARTIAL_SCH 0x02
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#define GSMTAP_BURST_SCH 0x03
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#define GSMTAP_BURST_CTS_SCH 0x04
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#define GSMTAP_BURST_COMPACT_SCH 0x05
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#define GSMTAP_BURST_NORMAL 0x06
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#define GSMTAP_BURST_DUMMY 0x07
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#define GSMTAP_BURST_ACCESS 0x08
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#define GSMTAP_BURST_NONE 0x09
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#define GSMTAP_UDP_PORT 4729 /* officially registered with IANA */
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struct gsmtap_hdr {
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u_int8_t version; /* version, set to 0x01 currently */
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u_int8_t hdr_len; /* length in number of 32bit words */
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u_int8_t type; /* see GSMTAP_TYPE_* */
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u_int8_t timeslot; /* timeslot (0..7 on Um) */
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u_int16_t arfcn; /* ARFCN (frequency).
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* highest bit 1 == uplink */
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u_int8_t noise_db; /* noise figure in dB */
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u_int8_t signal_db; /* signal level in dB */
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u_int32_t frame_number; /* GSM Frame Number (FN) */
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u_int8_t burst_type; /* Type of burst, see above */
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u_int8_t antenna_nr; /* Antenna Number */
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u_int16_t res; /* reserved for future use (RFU) */
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gsmtap_hdr(unsigned ARFCN, unsigned TS, unsigned FN)
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{
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version = GSMTAP_VERSION;
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type = GSMTAP_TYPE_UM;
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burst_type = GSMTAP_BURST_NONE;
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antenna_nr = 0;
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noise_db = 0;
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signal_db = 0;
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timeslot = TS;
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arfcn = htons(ARFCN);
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frame_number = htonl(FN);
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}
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} __attribute__((packed));
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/* PCAP related definitions */
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#define TCPDUMP_MAGIC 0xa1b2c3d4
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#ifndef LINKTYPE_GSMTAP
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#define LINKTYPE_GSMTAP 2342
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#endif
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struct pcap_timeval {
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int32_t tv_sec;
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int32_t tv_usec;
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};
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struct pcap_sf_pkthdr {
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struct pcap_timeval ts; /* time stamp */
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u_int32_t caplen; /* lenght of portion present */
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u_int32_t len; /* length of this packet */
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};
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#endif /* _GSMTAP_H */
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