ip: Allow ip_mreqn support for IP_MULTICAST_IF,IP_{ADD,DROP}_MEMBERSHIP

- ip_mreqn.imr_ifindex takes precendence over ip_mreqn.imr_address,
if it's not 0. This strictly follows what Linux does.
-

ip: Allow ip_mreqn support for IP_MULTICAST_IF,IP_{ADD,DROP}_MEMBERSHIP

- ip_mreqn.imr_ifindex takes precendence over ip_mreqn.imr_address,
if it's not 0. This strictly follows what Linux does.
- Allow ip_mreq for IP_MULTICAST_IF as what Linux does.

While I'm here, remove unnecessary critical section among
IP_MULTICAST_IF, IP_{ADD,DROP}_MEMBERSHIP.

Bump kernel version.

Requested-by: tuxillo

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udp: Port IPPROTO_IP/IP_TOS cmsg support from FreeBSD.

inet: Port IPPROTO/IP_RECVTOS from FreeBSD.

Bump kernel version.

Requested-by: zrj

udp: Port FreeBSD's IPPROTO_IP/IP_SENDSRCADDR.

Minor difference:
- Multicast src is not allowed.
- Always allow src, if it is same as inp_laddr and is not multicast.

While I'm here, fix datagram se

udp: Port FreeBSD's IPPROTO_IP/IP_SENDSRCADDR.

Minor difference:
- Multicast src is not allowed.
- Always allow src, if it is same as inp_laddr and is not multicast.

While I'm here, fix datagram sending for multicast bound and connected
UDP socket.

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