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Hi,

On Sat, Dec 07, 2002 at 01:45:05PM +0100, Thomas Finneid wrote:

> I am doing some analysis work on the network protocol stack, and are trying
> to find out where in the code in_cksum is being called in a udp output
> scenario. I have search the through the code and I found it for the input
> chain of udp but not for output.

You haven't looked very hard. It's in udp_output(), file netinet/udp_usrreq.c
for IPv4 and udp6_output() in file netinet6/udp_output.c for IPv6.

> I have also search through the web and the mail but found nothing.

The right place, if you want third-party advice, is

"Stevens/Write, TCP/IP Illustrated, Volume 2" Addison/Wesley, 0-201-63354-X

which "only" describes the state of affairs as of 4.4BSD, which was integrated
into NetBSD as of NetBSD-1.0 or -1.1, but it is a good starting point if you
want to get an overview.

Regards,
	-is

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