Initial IPv6 support for DCCP

Hi Yoshifuji-san!

Client (PARISC64):

acme@parisc:~$ ttcp -6 -cacme -l256 -n100000 -t 2002:c90f:db83:1010:a00:46ff:feac:fe55
ttcp-t: buflen=256, nbuf=100000, align=16384/+0, port=5001  dccp(inet6)  ->
2002:c90f:db83:1010:a00:46ff:feac:fe55
ttcp-t: socket
ttcp-t: connect
ttcp-t: 25600000 bytes in 2.80 real seconds = 8942.19 KB/sec +++
ttcp-t: 100000 I/O calls, msec/call = 0.03, calls/sec = 35768.74
ttcp-t: 0.0user 1.4sys 0:02real 53% 0i+0d 0maxrss 0+1pf 3142+2csw
acme@parisc:~$

Server (IA32):

[acme@toy ~]$ ttcp -6 -cacme,some,more,serv,ices -l256
ttcp-r: buflen=256, nbuf=2048, align=16384/+0, port=5001  dccp(inet6)
ttcp-r: socket
ttcp-r: accept from 2002:c90f:db83:1010:204:76ff:fe3b:53c1
ttcp-r: 25600000 bytes in 2.82 real seconds = 8867.18 KB/sec +++
ttcp-r: 100001 I/O calls, msec/call = 0.03, calls/sec = 35469.07
ttcp-r: 0.0user 2.7sys 0:02real 99% 0i+0d 0maxrss 0+0pf 0+20csw
[acme@toy ~]$

ttcp using get{name,addr}info crudely hacked up to support SOCK_DCCP:

http://vger.kernel.org/~acme/dccp/ttcp.c

Basicaly I did some more generalisations in the TCPv4/v6 infrastructure to
use it in DCCPv6, there are still several things to polish and implement
but looks really nice so far, same flow as TCPv6, using
inet6_timewait_sock'ets, inet6_request_sock'ets, inet_diag/iproute2/ss
works just fine for IPv6 sockets, etc :-)

Available at:

http://www.kernel.org/git/?p=linux/kernel/git/acme/net-2....

Mirrors haven't yet picked up my latest changeset, but its just renaming
secure_tcpv6_port_ephemeral to secure_ipv6_port_ephemeral as it has nothing
TCPv6 specific and is used in DCCPv6.

- Arnaldo
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