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Subject: [Bug 200128] [net80211] [patch]: exclude QoS Null frames from
sequence number checking
Date: Mon, 11 May 2015 13:00:46 +0000
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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@FreeBSD.org
Reporter: s3erios@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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