[Bug 234207] VRRP packets generate "ipfw: pullup failed"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234207

            Bug ID: 234207
           Summary: VRRP packets generate "ipfw: pullup failed"
           Product: Base System
           Version: 11.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: anssi at aketzu.net

I have a FreeNAS 11.2 storage box and a few other hosts doing VRRP with
keepalived. Every VRRP packet seems to cause "ipfw: pullup failed" logline
which  quickly fills the logs (e.g. 1 packet/logline per second).

# uname -a
FreeBSD storage.lan.vilant.com 11.2-STABLE FreeBSD 11.2-STABLE #0
r325575+fc3d65faae6(freenas/11.2-stable): Wed Dec  5 15:08:42 EST 2018    
root at nemesis.tn.ixsystems.com:/freenas-11.2-releng/freenas/_BE/objs/freenas-11.2-releng/freenas/_BE/os/sys/FreeNAS.amd64
 amd64

# tcpdump -XX -n vrrp
12:53:50.558001 IP 10.6.0.11 > 224.0.0.18: VRRPv2, Advertisement, vrid 42, prio
12, authtype simple, intvl 1s, length 20
        0x0000:  0100 5e00 0012 de6e 82bc 9e28 0800 45c0  ..^....n...(..E.
        0x0010:  0028 9c47 0000 ff70 343b 0a06 000b e000  .(.G...p4;......
        0x0020:  0012 212a 0c01 0101 aecd 5396 6004 3932  ..!*......S.`.92
        0x0030:  3639 0000 0000 0000 0000 0000            69..........

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