Wireshark-bugs: [Wireshark-bugs] [Bug 5538] ipv6.addr (etc) filter should be able to be specifie
Date: Mon, 10 Jan 2011 11:20:17 -0800 (PST)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5538

--- Comment #4 from Stephen Fisher <[email protected]> 2011-01-10 12:20:15 MST ---
(In reply to comment #3)

> Great... I came to the same conclusion, but was not able to find time to take
> on such a large task now. If you have any intermediate diffs we might be able
> to work on it together...

There are a number of comparison functions in the IPv4 code (epan/ipv4.c) that
apply the netmask to the address using a standard logical and such as "address
& mask" where both are an unsigned 32-bit integer (guint32).  What is the best
way to do this with IPv6 though?  Wireshark typically handles IPv6 addresses as
a string of 16 unsigned 8-bit bytes (guint8).  A brief look at FreeBSD's kernel
code shows that they can represent it as 4 32-bit unsigned integers or 8 16-bit
unsigned integers (shorts) or 16 8-bit unsigned integers (char).

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