Doubts in netfilter limit match

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Hi,

I want to know how the limit match works. When we are trying to restrict
the number of packets sent by a particular IP to, say, 3 / hour, we use a
iptable rule like

	iptables -A INPUT -s 127.0.0.1 -m limit --limit-burst 5

I want to know how and where the count is stored. Are they checked for
previous entries using netfilter log? Also, Can you please tell me the .c
file in the netfilter source code which deals with handling various match
and target extensions. If you can send me a link to any tutorial that
deals with linux network programming then that will be great.

Thanks and Regards,
Balaji
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