* sys/netinet/ip_input.c: AddAdd a NATPT hook into ip_input(). * sys/netinet/ip_proto.c: Add a NATPT entry into struct ipprotosw   inetsw[]. * sys/netinet6/ip6_input.c: include "opt_natpt.h" when FreeBSD   version is more than 3.
* sys/netinet/ip_input.c: AddAdd a NATPT hook into ip_input().
* sys/netinet/ip_proto.c: Add a NATPT entry into struct ipprotosw
  inetsw[].
* sys/netinet6/ip6_input.c: include "opt_natpt.h" when FreeBSD
  version is more than 3.

  Sorry, there is a problem a little, and NATPT does not work yet.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame