[Bug 256820] etherip over ipv6 doesn't work

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 25 Jun 2021 03:43:20 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256820

            Bug ID: 256820
           Summary: etherip over ipv6 doesn't work
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: masa.koz@seera-networks.com

I've found that encap6_input() is not registered for IPPROTO_ETHERIP and that
bridge(4) and gif(4) will not work over an IPv6-IPv6 tunnel. So, I've tried to
add below code and found that etherip over ipv6 will work after this fix.

https://github.com/masa-koz/freebsd-src/commit/9ccd2d8b3357bd257bed54c674ee22144e949587

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