ia_netbroadcast

[Pawel Jakub Dawidek]

Hi.

Do we still need ia_netboradcast field? It is calculated depending on
old-fashion classes (A, B, C). Is it used still?
I wonder if ia_broadaddr isn't sufficient today.

IP		netmask		ia_broadaddr	ia_netbroadcast
10.0.0.101	255.0.0.0	10.255.255.255	10.255.255.255
1.0.0.2		255.255.255.252	1.0.0.3		1.255.255.255
2.0.0.1		255.255.0.0	2.0.255.255	2.255.255.255

I'm planing to work on removing O(n) from interface aliases search.
Now every incoming packet have to be compared with every single
broadcast from every single alias. When I tested something and
there were ~10000 aliases on interface it worked really slow.

This slowdown probably exists in more places. It exists in NetBSD and
OpenBSD as well.

-- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd at FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!
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