PF_IPOPTION: A Kernel Extension for IP Option Packet Processing

              Ping Pan                  Henning Schulzrinne
         Bell Labs Research             Columbia University
     pingpan@research.bell-labs.com     hgs@cs.columbia.edu


Abstract:

Existing UNIX kernels cannot easily deliver IP packets containing IP
options to applications.  To address this problem, we have defined and
implemented a new protocol family called PF_IPOPTION for the FreeBSD kernel.  
We have verified the implementation with some of the commonly used IP options.  
Measurements in kernel and user space showed that BSD socket I/O is 
the performance bottleneck.