Wireshark mailing list archives
regarding failed fcs and mac80211 subsystem
From: abhinav narain <abhinavnarain10 () gmail com>
Date: Fri, 17 Feb 2012 18:15:01 -0500
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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