From owner-freebsd-hackers  Sun Jan 27 10:17: 3 2002
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From: "Dan Langille" <dan@langille.org>
Organization: DVL Software Limited
To: freebsd-hackers@freebsd.org
Date: Sun, 27 Jan 2002 13:16:47 -0500
MIME-Version: 1.0
Subject: (Fwd) ip_output() does not checksum outer header
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I am forwarding this on behalf of Bruce (his DNS is borked and thus he 
cannot send to the lists).  Please don't CC me in the replies, only Bruce. 

 Thanks.

------- Forwarded message follows -------
Date sent:      	Fri, 25 Jan 2002 23:35:38 +0000
From:           	Bruce M Simpson <bms@spc.org>
To:             	dan@langille.org
Subject:        	ip_output() does not checksum outer header

Dan,

if you could forward this on to freebsd-net I would be most grateful.

I have completed most of the code to implement GRE as a regular
interface driver under 4.4-STABLE using the cloner interface. This
has all worked fine in local tests. Tonight, whilst testing with
a remote site, we noticed that the encapsulating IP datagram header
around the GRE header does not have any header checksum.

I have checked, checked and re-checked the m->m_len, m->m_pkthdr.len,
m_pullup() results et al and can find nothing out of the ordinary.

This is driving me mad right now, can anybody shed any light on the
problem?

Regards,
Bruce.

------- End of forwarded message -------

-- 
Dan Langille
The FreeBSD Diary - http://freebsddiary.org/ - practical examples


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