Mobile IPv6 patch for NetBSD-current (revised)

[Keiichi SHIMA <keiichi%iijlab.net@localhost>]

Hello all,

Long time ago, I proposed Mobile IPv6 patch for NetBSD current.  I  
received several comments, but could not release revised patch until  
now.  Sorry for my long silence.

I'm now releasing the patch again with some updates.  The modified  
points from the previous patch are:

- less '#ifdef MOBILE_IPV6' especially in 'if' conditions
  to improve code readability
- mip(4) manual (it is still very basic, though)

Some suggested me that the code should support FAST_IPSEC.  I  
completely understand the idea, however, the patch is not ready to  
support it yet.  I will support it once the patch is imported to the  
repository.

Others suggested that it would be great if there was an implementation  
document (like IP, IPv6, IPsec).  I haven't written that kind of  
documents yet.

The patch (and new files) is available from  
http://www.mobileip.jp/~keiichi/tmp/mobile-ipv6-20080125.tgz

The overview of the change is:

- the type 2 routing header processing
- the home address option (one of the destination options)
 processing.
- some new ICMPv6 messages defined in Mobile IPv6
- the mobility header processing (the new extension header for
 Mobile IPv6 signaling messages)
- the mip pseudo interface to represent a home network
- the mobility information message exchange mechanism between
 the kernel and user space programs (PF_MOBILITY socket)
- new IPv6 address properties (e.g. the HOME flag,
 the DEREGISTERING flag)
- the type 2 routing header socket API
- neighbor discovery extension (e.g. retuning home detection for
 mobile nodes, packet intercept by home agents)
- source address selection extension (home addresses are preferred)
- IPsec SA/SP db update according to the movement of mobile nodes.

With this change, the following files are modified:
    distrib/sets/lists/comp/mi
    lib/libc/net/rthdr.c
    sbin/ifconfig/af_inet6.c
    sbin/ifconfig/ifconfig.c
    sys/conf/files
    sys/net/Makefile
    sys/net/if_types.h
    sys/net/pfkeyv2.h
    sys/net/route.h
    sys/net/rtsock.c
    sys/netinet/Makefile
    sys/netinet/icmp6.h
    sys/netinet/in.h
    sys/netinet/ip6.h
    sys/netinet6/Makefile
    sys/netinet6/dest6.c
    sys/netinet6/files.netinet6
    sys/netinet6/in6.c
    sys/netinet6/in6.h
    sys/netinet6/in6_proto.c
    sys/netinet6/in6_src.c
    sys/netinet6/in6_var.h
    sys/netinet6/ip6_forward.c
    sys/netinet6/ip6_input.c
    sys/netinet6/ip6_output.c
    sys/netinet6/ip6_var.h
    sys/netinet6/ipsec.c
    sys/netinet6/nd6.c
    sys/netinet6/nd6.h
    sys/netinet6/nd6_nbr.c
    sys/netinet6/nd6_rtr.c
    sys/netinet6/raw_ip6.c
    sys/netinet6/route6.c
    sys/netkey/key.c
    sys/netkey/key.h
    sys/sys/socket.h

The change introduces these new files
    share/man/man4/mip.4
    sys/net/if_mip.c
    sys/net/if_mip.h
    sys/net/mipsock.c
    sys/net/mipsock.h
    sys/netinet/ip6mh.h
    sys/netinet6/mip6.c
    sys/netinet6/mip6.h
    sys/netinet6/mip6_var.h


Best Regards,

---
Keiichi SHIMA
IIJ Research Laboratory <keiichi%iijlab.net@localhost>
WIDE Project <shima%wide.ad.jp@localhost>