kern/183428: [net80211] [iwn] Some APs seem to announce HT but no HT rates

Adrian Chadd adrian at FreeBSD.org
Tue Oct 29 04:00:00 UTC 2013


>Number:         183428
>Category:       kern
>Synopsis:       [net80211] [iwn] Some APs seem to announce HT but no HT rates
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 29 04:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Adrian Chadd
>Release:        -HEAD
>Organization:
>Environment:
>Description:
I just came across an 802.11n AP that doesn't announce 802.11n rates.

The net80211 code dutifully sets the channel up as an 11n channel and populates the HT rate set as empty.

So, amrr gets very confused when this occurs. And so does iwn.

There's two things to fix:

* amrr should not treat the node as 11n if there are no 11n rates;
* iwn should not assume that if the channel is 11n, that the rate is an MCS rate.

>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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