Philip Paeps b0e1660d53 Fix GRE over IPv6 tunnels with IPFW
Previously, GRE packets in IPv6 tunnels would be dropped by IPFW (unless
net.inet6.ip6.fw.deny_unknown_exthdrs was unset).

PR:		220640
Submitted by:	Kun Xie <kxie@xiplink.com>
MFC after:	1 week
2017-07-13 09:01:22 +00:00
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