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nfqnl_mangle
2009 Jan 19
1
Non-linear skbs apparently prevent NFQUEUE from working properly
...odify 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 dri...