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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