Netfilter API help

Netfilter API help

[Tharanga]

Hello All,

Iam new to netfilter . and trying to implement a new firewall on linux 2.6.X
kernel. can some one give me a URL to find the Netfilter API documentation
to start my work. i trid to find it but couldnt. i'll be greatful , if some
one can give me a breif introduciton to netfilter capabilities .
then whats the different between berkley packet filtering and Netfilter ???

Many thanks,
Tharanga

Re: Netfilter API help

[Henrik Nordstrom]

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mån 2007-04-23 klockan 15:10 +0600 skrev Tharanga:

> Iam new to netfilter . and trying to implement a new firewall on linux 2.6.X
> kernel. can some one give me a URL to find the Netfilter API documentation
> to start my work. i trid to find it but couldnt. i'll be greatful , if some
> one can give me a breif introduciton to netfilter capabilities .

There is many layers...

Linux kernel TCP/IP stack

Netfilter hooks into the above.

Netfilter common infrastructure, mainly conntrack, nat  and some netlink
stuff

iptables

iptables matches & targets


The best source to netfilter programming details is the source code,
after first reading the netfilter hacking howto which gives a reasonable
(even if slightly outdated) introduction. Combined with making focused
questions on this mailinglist.

Regards
Henrik

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