regarding failed fcs and mac80211 subsystem

[abhinav narain <abhinavnarain10 () gmail com>]

hi,
 I am trying to get the code flow of mac80211 subsystem,
 I notice a comment in  ieee80211_rx() before call to ieee80211_rx_monitor()

        /*
         * Frames with failed FCS/PLCP checksum are not returned,
         * all other frames are returned without radiotap header
         * if it was previously present.
         * Also, frames with less than 16 bytes are dropped.
         */

This suggest the frames with bad fcs are not forwarded up !
How does pcap get the bad fcs frames for wireshark, in that case ..  ?

Does someone has an idea if mac80211 subsystem does any checksums on the
packet headers/packet as a whole ?
I am unable to find it if it does so only on the packet (contained in
sk_buff) data [TCP/UDP/other protocol data region] ?

Abhinav

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