Packet forwarding queries
From: kernel.lover (cranium.2003_at_gmail.com)
Date: 01/30/05
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Date: 30 Jan 2005 02:09:34 -0800
Hello,
1) How Router knows destinations mtu. In IP forwarding case following
function is used that checks pmtu value to decide whether outgoing
packet is required to fragment a packet or not?
static inline int ip_send(struct sk_buff *skb)
{
if (skb->len > skb->dst->pmtu)
return ip_fragment(skb, ip_finish_output);
else
return ip_finish_output(skb);
}
2) Can anybody help me how following function works in calcualting
checksum?
static inline int ip_decrease_ttl(struct iphdr *iph)
{
u32 check = iph->check;
check += __constant_htons(0x0100);
iph->check = check + (check>=0xFFFF);
return --iph->ttl;
}
regards,
cranium
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