[Bug 222746] ipfw: tcpdatalen does not exactly match IPv6 packets.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222746

            Bug ID: 222746
           Summary: ipfw: tcpdatalen does not exactly match IPv6 packets.
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tatsuki_makino at hotmail.com

Created attachment 186874
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=186874&action=edit
patch for CURRENT

tcpdatalen rule option does not match IPv6 packets correctly because code for
IPv6 is not implemented.

# ipfw show 3100
03100    1819    135800 count log logamount 1000 tcp from any to any { tcpflags
syn or tcpflags rst } tcpdatalen 32768-65535 // signed negative number range

The size of 1819 packets was over 32768 bytes, but the total was 135800 bytes.

tested on
# uname -a
FreeBSD T2.test 10.4-PRERELEASE FreeBSD 10.4-PRERELEASE #0 r324142M: Sun Oct  1
01:25:30 UTC 2017     root at T2.test:/usr/obj/usr/src/sys/GENERIC  amd64

A patch needs to be tested by people who know them well.

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