| #ifndef _GSMTAP_H |
| #define _GSMTAP_H |
| |
| /* gsmtap header, pseudo-header in front of the actua GSM payload */ |
| |
| /* GSMTAP is a generic header format for GSM protocol captures, |
| * it uses the IANA-assigned UDP port number 4729 and carries |
| * payload in various formats of GSM interfaces such as Um MAC |
| * blocks or Um bursts. |
| * |
| * Example programs generating GSMTAP data are airprobe |
| * (http://airprobe.org/) or OsmocomBB (http://bb.osmocom.org/) |
| */ |
| |
| #include <stdint.h> |
| |
| #define GSMTAP_VERSION 0x02 |
| |
| #define GSMTAP_TYPE_UM 0x01 |
| #define GSMTAP_TYPE_ABIS 0x02 |
| #define GSMTAP_TYPE_UM_BURST 0x03 /* raw burst bits */ |
| |
| #define GSMTAP_BURST_UNKNOWN 0x00 |
| #define GSMTAP_BURST_FCCH 0x01 |
| #define GSMTAP_BURST_PARTIAL_SCH 0x02 |
| #define GSMTAP_BURST_SCH 0x03 |
| #define GSMTAP_BURST_CTS_SCH 0x04 |
| #define GSMTAP_BURST_COMPACT_SCH 0x05 |
| #define GSMTAP_BURST_NORMAL 0x06 |
| #define GSMTAP_BURST_DUMMY 0x07 |
| #define GSMTAP_BURST_ACCESS 0x08 |
| #define GSMTAP_BURST_NONE 0x09 |
| |
| #define GSMTAP_CHANNEL_UNKNOWN 0x00 |
| #define GSMTAP_CHANNEL_BCCH 0x01 |
| #define GSMTAP_CHANNEL_CCCH 0x02 |
| #define GSMTAP_CHANNEL_RACH 0x03 |
| #define GSMTAP_CHANNEL_AGCH 0x04 |
| #define GSMTAP_CHANNEL_PCH 0x05 |
| #define GSMTAP_CHANNEL_SDCCH 0x06 |
| #define GSMTAP_CHANNEL_SDCCH4 0x07 |
| #define GSMTAP_CHANNEL_SDCCH8 0x08 |
| #define GSMTAP_CHANNEL_TCH_F 0x09 |
| #define GSMTAP_CHANNEL_TCH_H 0x0a |
| #define GSMTAP_CHANNEL_ACCH 0x80 |
| |
| #define GSMTAP_ARFCN_F_PCS 0x8000 |
| #define GSMTAP_ARFCN_F_UPLINK 0x4000 |
| #define GSMTAP_ARFCN_MASK 0x3fff |
| |
| #define GSMTAP_UDP_PORT 4729 |
| |
| struct gsmtap_hdr { |
| uint8_t version; /* version, set to 0x01 currently */ |
| uint8_t hdr_len; /* length in number of 32bit words */ |
| uint8_t type; /* see GSMTAP_TYPE_* */ |
| uint8_t timeslot; /* timeslot (0..7 on Um) */ |
| |
| uint16_t arfcn; /* ARFCN (frequency) */ |
| int8_t signal_dbm; /* signal level in dBm */ |
| int8_t snr_db; /* signal/noise ratio in dB */ |
| |
| uint32_t frame_number; /* GSM Frame Number (FN) */ |
| |
| uint8_t sub_type; /* Type of burst/channel, see above */ |
| uint8_t antenna_nr; /* Antenna Number */ |
| uint8_t sub_slot; /* sub-slot within timeslot */ |
| uint8_t res; /* reserved for future use (RFU) */ |
| |
| } __attribute__((packed)); |
| |
| #endif /* _GSMTAP_H */ |