[Bug 256120] [net80211] [patch]: prevent plaintext injecting using cloaked A-MSDUs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256120

            Bug ID: 256120
           Summary: [net80211] [patch]: prevent plaintext injecting using
                    cloaked A-MSDUs
           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 225222
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=225222&action=edit
patch: git diff file

FreeBSD is vulnerable to CVE-2020-26144 of the "FragAttacks" findings. For
background see Section 6.5 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 "eapol-amsdu-bad
I,P" (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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