MFC r320941: 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 r320941: Fix GRE over IPv6 tunnels with IPFW Tags None Referenced Files None Subscribers None
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