chnage source of IPFW

[Luigi Rizzo]

On Mon, Jun 1, 2015 at 11:44 AM, samira <nazari.s11 at gmail.com> wrote:

> Hello every one,
> I want to add a parameter in commands for ipfw,  like " ipfw add allow udp
> from any to any *udpdatalen 10 * ".
>

​adding commands is doable but it requires you to touch
multiple parts of the code, namely:

- the parsing function in userspace
- the decoding function in userspace
- the validate function in the kernel (typically one case
  in a large switch() statement)
- the function implementation in the kernel (one case in
  another, even bigger switch statement)

For things like "udpdatalen X" you might be better off
doing something like " ... udp iplen X+20 ..."

cheers
luigi
​


>
> I changes in /usr/src/sbin/ipfw/ipfw2.c like tcpdatalen option and now i
> have udpdatalen command correctly in cli, but when i add argument(10) this
> error occurred.
> " *ipfw: getsockopt(IP_FW_ADD): Invalid argument* "
>
> also I define variables in /usr/src/sys/netinet/ip_fw.h and change .c files
> in /usr/src/sys/net pfil/ and build kernel and did not changed that error.
>
> Thank you for all of your comments and help.
>
>
>
>
>
>
>
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 Prof. Luigi RIZZO, rizzo at iet.unipi.it  . Dip. di Ing. dell'Informazione
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