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mbuf_outbound_finalize bug?

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mbuf_outbound_finalize bug?

Subject: mbuf_outbound_finalize bug?
From: "Bhavesh Davda" <email@hidden>
Date: Wed, 20 Dec 2006 18:17:46 -0800

When calling mbuf_outbound_finalize() to compute the incomplete
TCP/UDP checksums on the mbuf from my iff_output_func (interface
filter output function), I kept getting messages from the kernel
"cksum: out of data".

Looking at the xnu-792.13.8 source, it looks like the underlying
in_cksum_skip, called from in_delayed_cksum_offset, expects the ip_len
field in the IP header to be in host-byte-order, while in reality the
mbuf handed to my iff_output_func had the ip_len field in the IP
header correctly populated in network-byte-order.

What is my iff_output_func to do in such a situation?

Thanks!

--
Bhavesh P. Davda
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