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There are 9 pins in a basic serial port.
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struct_ieee80211_rx_status(9) [centos man page]

STRUCT 
IEEE80211_RX_(9) The basic mac80211 driver inte STRUCT IEEE80211_RX_(9) NAME
struct_ieee80211_rx_status - receive status SYNOPSIS
struct ieee80211_rx_status { u64 mactime; u32 device_timestamp; u32 ampdu_reference; u32 flag; u32 vendor_radiotap_bitmap; u16 vendor_radiotap_len; u16 freq; u8 rate_idx; u8 vht_nss; u8 rx_flags; u8 band; u8 antenna; s8 signal; u8 ampdu_delimiter_crc; u8 vendor_radiotap_align; u8 vendor_radiotap_oui[3]; u8 vendor_radiotap_subns; }; MEMBERS
mactime value in microseconds of the 64-bit Time Synchronization Function (TSF) timer when the first data symbol (MPDU) arrived at the hardware. device_timestamp arbitrary timestamp for the device, mac80211 doesn't use it but can store it and pass it back to the driver for synchronisation ampdu_reference A-MPDU reference number, must be a different value for each A-MPDU but the same for each subframe within one A-MPDU flag RX_FLAG_* vendor_radiotap_bitmap radiotap vendor namespace presence bitmap vendor_radiotap_len radiotap vendor namespace length freq frequency the radio was tuned to when receiving this frame, in MHz rate_idx index of data rate into band's supported rates or MCS index if HT or VHT is used (RX_FLAG_HT/RX_FLAG_VHT) vht_nss number of streams (VHT only) rx_flags internal RX flags for mac80211 band the active band when this frame was received antenna antenna used signal signal strength when receiving this frame, either in dBm, in dB or unspecified depending on the hardware capabilities flags IEEE80211_HW_SIGNAL_* ampdu_delimiter_crc A-MPDU delimiter CRC vendor_radiotap_align radiotap vendor namespace alignment. Note that the actual data must be at the start of the SKB data already. vendor_radiotap_oui[3] radiotap vendor namespace OUI vendor_radiotap_subns radiotap vendor sub namespace DESCRIPTION
The low-level driver should provide this information (the subset supported by hardware) to the 802.11 code with each received frame, in the skb's control buffer (cb). AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT IEEE80211_RX_(9)

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STRUCT 
IEEE80211_RAD(9) Utility functions STRUCT IEEE80211_RAD(9) NAME
struct_ieee80211_radiotap_iterator - tracks walk thru present radiotap args SYNOPSIS
struct ieee80211_radiotap_iterator { struct ieee80211_radiotap_header * _rtheader; const struct ieee80211_radiotap_vendor_namespaces * _vns; const struct ieee80211_radiotap_namespace * current_namespace; unsigned char * _arg; unsigned char * _next_ns_data; __le32 * _next_bitmap; unsigned char * this_arg; int this_arg_index; int this_arg_size; int is_radiotap_ns; int _max_length; int _arg_index; uint32_t _bitmap_shifter; int _reset_on_ext; }; MEMBERS
_rtheader pointer to the radiotap header we are walking through _vns vendor namespace definitions current_namespace pointer to the current namespace definition (or internally NULL if the current namespace is unknown) _arg next argument pointer _next_ns_data beginning of the next namespace's data _next_bitmap internal pointer to next present u32 this_arg pointer to current radiotap arg; it is valid after each call to ieee80211_radiotap_iterator_next but also after ieee80211_radiotap_iterator_init where it will point to the beginning of the actual data portion this_arg_index index of current arg, valid after each successful call to ieee80211_radiotap_iterator_next this_arg_size length of the current arg, for convenience is_radiotap_ns indicates whether the current namespace is the default radiotap namespace or not _max_length length of radiotap header in cpu byte ordering _arg_index next argument index _bitmap_shifter internal shifter for curr u32 bitmap, b0 set == arg present _reset_on_ext internal; reset the arg index to 0 when going to the next bitmap word DESCRIPTION
Describes the radiotap parser state. Fields prefixed with an underscore must not be used by users of the parser, only by the parser internally. AUTHOR
Johannes Berg <johannes@sipsolutions.net> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT IEEE80211_RAD(9)

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