Re: adding new tcp option to the tcp header

[Andi Kleen <[e-mail]>]

On Thu, May 16, 2002 at 05:17:02AM +0200, Murgan  Ram wrote:
> Hi,
>       Can you tell me how I can hardcore a new option
> ( 1 bit option ) into the tcp header option field( I am using Red 
> Hat Linux 7.1.) which the sender can optionally enable and the 
> receiver can read it. Additionally could you tell me any site 
> where I could read more abt it. I would like to add a system call 
> to my program which can hardcore this option into the header 
> everytime it is called. So, please tell me what the system call 
> should do to do the job.

chdir("/usr/src/linux"); 
system(getenv("EDITOR")) 

seriously: Linux only has socket options to specify IP options per socket.
There is no way to set TCP options without changing the TCP output 
functions in net/ipv4/tcp_output.c. Also even IP options can only be set
per socket, not globally.

-Andi