point2point network interfaces cannot receive ipv6 packets

[Takahiro HAYASHI <t.hash425%gmail.com@localhost>]

Hello,

It seems that IFF_POINTTOPOINT interfaces like tun and gif cannot
receive ipv6 packets.
This occurs on NetBSD/amd64 -current since Feb 27 2015.

For example, establishing gif tunnnel between 2 hosts.

[host1] <---> [host2]
192.168.0.1   192.168.0.2  ipv4 address of real interface
fd00::1       fd00::2      gif address

When I ping6, a host can send ICMPv6 ECHO(128), but the other host
returns ICMPv6 DST_UNREACH(1) code UNREACH_ADDR(3) to pinging host.


Thanks,
--
t-hash