about ip_options_compile

From: Antoine Luu (aluu@cse.ogi.edu)
Date: Thu Jul 31 2003 - 15:23:29 EST

Hi,
I try to understand how are set and read the ip options in the kernel,
and I find something that I can understand in the function
ip_options_compile of ip_options.c.

----- net/ipv4/ip_options.c ------

245 int ip_options_compile(....)
246 {
        ...
250 int optlen;
          ...
281 optlen = optptr[1];
282 if(optlen<2 || optlen>1){
283 pp_ptr = optptr;
284 goto error;
285 }
        ....
457 }

-----------------------------------------

(the number of the line come from the kernel 2.4.20
http://www.iglu.org/lxr/srouce/net/ipv4/ip_options.c )

For me, this test is always true, maybe I am wrong. So if someone can
explain me how this work ...

Thank for all.

Antoine Luu

ps : I also look for any documentation about how modify the ip options
in the kernel.

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