tcp_conn_request()

This function is called when a socket in the LISTEN state receives a SYN segment. This is an attempt by a client to initiate a connection with the server.

Our first change involves the waking up of the socket. A check is made to determine if the segment contains data. If it does, we leave the socket alone until we have all the data:

if (!sk->dead) { 

   if (data_len <= 0) 

   /* 

    * If we have received data in the SYN segment, 

    * we don't want to wake up the socket yet, need 

    * to do a bit of processing first. 

    */ 

   sk->data_ready(sk,0);

}

The next change occurs further on in the function. tcp_options() is called to find any options and set CC flags if T/TCP is being used. We now use these flags and the CC values to determine whether the TAO test passed or not (appendix A.2.4):

timinput{code/pseudo_conn_request}}{\scriptsize \pr