Adding a rule such as this:

-A INPUT -p ipv6-icmp -m icmpv6

ends up creating a rule with "ipv6-icmp type 0", instead of "ipv6-icmp type any"
which is what was expected.  Granted, the match is redundant anyway, but it
should not assume a specific type when one is not specified.

Below patches (to both kernel and userspace) fix this, and resolve bug #461.
In keeping with icmpv4, 0xFF is used to designate "any". And since I was
looking at it, I fixed up a 255 -> any in icmpv4 printing.

Phil

Signed-off-by: Phil Oester <kernel@linuxace.com>