* why we use skb->rt->rt_src as dest address when replying packet?
@ 2007-05-16 10:29 lepton
0 siblings, 0 replies; only message in thread
From: lepton @ 2007-05-16 10:29 UTC (permalink / raw)
To: netdev
I found in function [ip_send_reply] and [icmp_reply], we
use such code to get the destination address of our
packet:
struct rtable *rt = (struct rtable *)skb->dst;
......
daddr = ipc.addr = rt->rt_src;
I have a question here:
Is there any special reason for using rt->rt_src as destination address?
Can I use codes like these?
struct iph * ip = skb->nh.iph;
......
daddr = ipc.addr = ip->saddr;
I found in some case, rt->rt_src is not equal to ip->saddr. Thanks.
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2007-05-16 10:29 why we use skb->rt->rt_src as dest address when replying packet? lepton
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