Xen users - Jan 2009 - Non-linear skbs apparently prevent NFQUEUE from working properly

Dear list members (especially Xen network wizards),

I''m using the netfilter_queue mechanism to modify packets on the wire
that
are sent from one domU to another while they travel over the dom0 bridge.
This has worked fine as long as I was tinkering with UDP packets only -
but when I try to reinject TCP frames with an increased length, I run into
a BUG() because net/netfilter/nfnetlink_queue.c:nfqnl_mangle() calls
skb_put() which requires the skb to be aligned, which it apparently
isn''t
in a Xen environment.

I''ve ported my network scenario to a Usermode Linux setup and
it''s
working perfectly fine there, so I presume this has something to do with
Xen''s network driver implementation.

It would be great if someone could point me into the right direction.


Thanks in advance,

Jan

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Xen-users@lists.xensource.com
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Dear list members (especially Xen network wizards),

I''m using the netfilter_queue mechanism to modify packets on the wire
that
are sent from one domU to another while they travel over the dom0 bridge.
This has worked fine as long as I was tinkering with UDP packets only -
but when I try to reinject TCP frames with an increased length, I run into
a BUG() because net/netfilter/nfnetlink_queue.c:nfqnl_mangle() calls
skb_put() which requires the skb to be aligned, which it apparently
isn''t
in a Xen environment.

I''ve ported my network scenario to a Usermode Linux setup and
it''s
working perfectly fine there, so I presume this has something to do with
Xen''s network driver implementation.

It would be great if someone could point me into the right direction.
(This is 2.6.24 with Xen 3.2 - I''m reluctant to upgrade right now
because
this is a production system. I''d prefer any option over upgrading.)


Thanks in advance,

Jan

_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users