Hi, maybe it's a naive question. But I am confused here.
For the options field of an IP header, as for the data in this field, according to document and the code in the method of "ip_options_compile", the first byte is the options type data and the second byte is the length of the option. But I traced back the method of "ip_options_get_from_user", there is no place that assign these two values to the __data field.
I checked some example of socket API "setsockopt", it also just converts the target options data pointer into a char * pointer and passes down to "ip_options_get_from_user", still it doesn't set these two values.
Can anyone help me on this? Because I am trying to add my own options to IP header at the IP layer for some experiment purposes.
struct linger linger = { 0 };
linger.l_onoff = 1;
linger.l_linger = 30;
status = setsockopt(serverSocket,
SOL_SOCKET, SO_LINGER,
(const char *) &linger,
sizeof(linger));_______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
