inpcb: Define inp_notify_t
udp: Unify ctlinput and ctlport cmd/faddr/icmp_ip processing
udp: Fix parameter order of udp_addrcpu()
tcp: Unitfy ctlinput and ctlport cmd/faddr/icmp_ip processing
udp: udp_cport() has already been nuked
udp: Don't mess w/ hardware RSS for IP fragments

ip_input() always checks RSS hash value for IP fragments, and there
is better chance that hardware calculates correct RSS hash value for
IP fragments.
ipdemux: Remove 'direction' parameter

It is no longer needed/used.