ipfw buffers too small?

John Hay jhay at meraka.org.za
Sat Sep 16 05:38:24 PDT 2006


Hi,

It seems that the buffer sizes inside ipfw did not keep up with its
possible uses. If I run this:

ipfw add 160 allow ip6 from 3000::/16,3100::/16,3200::/16,3300::/16,3ffe::/16,4ffe::/16,2000::/16,2001::/16 to any

it put this inside the kernel:

00160 allow ip6 from { me6 or to any

A shorter one does work:
ipfw add 170 allow ip6 from 3200::/16,3300::/16,3ffe::/16,4ffe::/16,2000::/16,2001::/16 to any
00170 allow ip6 from 3200::/16,3300::/16,3ffe::/16,4ffe::/16,2000::/16,2001::/16 to any

So I have two questions, should the arrays (rulebuf, actbuf and cmdbuf) in
ipfw/ipfw2.c:add() not be bigger? And the more important question, should
it not have some bounds checking?

John
-- 
John Hay -- John.Hay at meraka.csir.co.za / jhay at FreeBSD.org


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