Re: How to programmatically implement a firewall rule

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On 5 January 2017 at 11:56, Khawar Shehzad <shehzad.khawar@xxxxxxxxx> wrote:
> HI,
> I hope all are fine, and happy new year.
>
>
> I want to implement a rule using libnftnl in C programming. This rule
> specifies that a packet with a specific source address and a specific
> destination address SHOULD be allowed. All other packet which does not
> have that source and destination address MUST be dropped.
>
>
> Just a little hint would suffice. I need to implement it. Any
> direction would be much appreciated.

Take a look at libnftnl examples. In nft-rule-add.c [0] a rule that
does 'tcp dport 22 counter' is added.

[0] http://git.netfilter.org/libnftnl/tree/examples/nft-rule-add.c
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