[Bug 196646] r276149 breaks gif with if_bridge and EtherIP

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196646

            Bug ID: 196646
           Summary: r276149 breaks gif with if_bridge and EtherIP
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: john at jnielsen.net

I discovered this under 10-STABLE but it probably affects 11-CURRENT (after
r273087) as well.

I've been using a gif(4) Ethernet (EtherIP/if_bridge) tunnel between two
10-STABLE FreeBSD machines for a while with no problem. After updating both
sides on 2014-12-30 the tunnel stopped working.

Today I reverted r276149 (the MFC of the if_gif overhaul) from my source tree
and rebuilt the kernel. The tunnel works again.

I'm sure the if_gif overhaul was needed but it would be great to get the
EtherIP functionality restored.

Both ends of the tunnel are running: 10.1-STABLE FreeBSD 10.1-STABLE #2
r276732M [minus r276149]: Fri Jan  9 11:16:55 MST 2015

I'm happy to test patches.

Environment:
FreeBSD 10.1-STABLE

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