[Bug 200128] [net80211] [patch]: exclude QoS Null frames from sequence number checking

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200128

            Bug ID: 200128
           Summary: [net80211] [patch]: exclude QoS Null frames from
                    sequence number checking
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: s3erios at gmail.com
          Keywords: patch

Created attachment 156655
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=156655&action=edit
Do not check sequence number for QoS Null frames; set it for generated QoS Null
frames to 0

>From IEEE Std. 802.11-2012, 8.3.2.1 "Data frame format", p. 415 (513):
"The Sequence Control field for QoS (+)Null frames is ignored by the receiver
upon reception."

At this moment, any <mode>_input() function interprets them as regular QoS data
frames with TID = 0. As a result, stations, that use another TX sequence for
QoS Null frames (e.g. wpi(4), where (QoS) Null frames are generated by the
firmware), may experience significant packet loss with any other NIC in hostap
mode.

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