linux-kernel - 2.6.26:in NF_BR_FORWARD hook why packet dissapeared?

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Date:	Wed, 17 Sep 2008 21:13:25 +0800 (CST)
From:	zheng yong <zy_ball@...oo.com.cn>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.26:in NF_BR_FORWARD hook why packet dissapeared? 

in NF_BR_FORWARD hook function, 
I get a sk_buff * parameter called skb.
I use the skb and skb_copy_expand to create a new
sk_buff * called new_skb, 
the new_skb has the same ip header and tcp header with
skb, except recompute ip/tcp checksum,
then send it out using dev_queue_xmit, 
dev_queue_xmit returnes successful(returnes 0), 
and in NF_BR_FORWARD hook function I return NF_DROP.
but at the peer, can not receive the packet sent.
I use ethereal, sometimes, I will receive some
"Ethernet II" packets, but their ethernet addresses
are wrong, It seems they were filled using the first
12 bytes of ip header.
why?

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