From OpenBSD, rev. 1.524, 1.528, 1.529 Deal with IPv6 routing headers (see FreeBSD-SA-07:03.ipv6 for background) Block IPv6 packets with routing headers by default, unless 'allow-opts' is specified. Block RH0 unconditionally. Deal with ip6_plen 0.
From OpenBSD, rev. 1.524, 1.528, 1.529
Deal with IPv6 routing headers (see FreeBSD-SA-07:03.ipv6 for background)
Block IPv6 packets with routing headers by default, unless 'allow-opts'
is specified. Block RH0 unconditionally. Deal with ip6_plen 0.

MFC after:	1 week
Discussed with:	mlaier

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