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Subjecthow to replace a skb within NF_IP_LOCAL_OUT hook
Date
Hi,all
i do it as below.

cp = skb_copy_expand(*skb, skb_headroom(*skb)+12, skb_tailroom(*skb),
GFP_ATOMIC);
cp->csum = (*skb)->csum;
skb_set_owner_w(cp, (*skb)->sk);
*skb = cp;
return NF_ACCEPT;

but it can't work perfectly.

How?




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