scapy 2.4.5 no longer supports send() to OpenBSD loopback interface.
With older 2.4.4 it worked with IPv4, but was broken for IPv6. So
use the IPv6 workaround also for IPv4. Prepend the address fam

scapy 2.4.5 no longer supports send() to OpenBSD loopback interface.
With older 2.4.4 it worked with IPv4, but was broken for IPv6. So
use the IPv6 workaround also for IPv4. Prepend the address family
in front of the IP packet and use sendp() to insert it into loopback
interface.

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The pf IPv4 option and IPv6 extension header filter has stricter
checks for IGMP and ICMP6 MLD packets. Use ttl, hlim, link-local,
and multicast features in test where necessary.

Check that IGMP and ICMP6 MLD packets with router alert option pass.
Other combinations with IP options are still blocked.