analysing ip_rcv code problems
From: cranium2003 <hidden>
Date: 2004-12-10 09:55:57
hello,
I know that in kernel 2.4 series,
function used to receive IP packets is ip_rcv. But i
am not getting where exactly IP header is removed that
is following lines from function ip_rcv can be used to
remove IP header
if (!pskb_may_pull(skb,
sizeof(struct iphdr)))
goto inhdr_error;
iph = skb->nh.iph;
...
...
...
...
and also
following lines from same kernel is used to remove
header as IP
header length is 20 bytes then which function actually
does IP header removal.
if (!pskb_may_pull(skb,
iph->ihl*4))
goto inhdr_error;
iph = skb->nh.iph;
Also why iph = skb->nh.iph statement is used twice in
function code ip_rcv.
regards,
cranium.
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