[Bug 256119] [net80211] [patch]: mitigate A-MSDU FragAttacks design flaw

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256119

            Bug ID: 256119
           Summary: [net80211] [patch]: mitigate A-MSDU FragAttacks design
                    flaw
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: mathy.vanhoef at cs.kuleuven.be

Created attachment 225221
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225221&action=edit
patch: git diff file

FreeBSD is also affected by the A-MSDU design flaw in Wi-Fi (CVE-2020-24588).
For background see Section 3 in https://papers.mathyvanhoef.com/usenix2021.pdf

This vulnerability can be reproduced using the FragAttack test tool at
https://github.com/vanhoefm/fragattacks with the test case "amsdu-inject-bad"
(the injected ping request should be rejected by the kernel).

The attached patches fixes this vulnerability. It was tested using a Belkin
F5D8053 (run driver) in client mode.

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