Reading outbound packets to datalink layer using C sockets API - how?

Hi

I've recently written a packet dump program that logs all the inbound packets
to my server using a socket created using the following call:

socket(PF_PACKET,SOCK_DGRAM,htons(ETH_P_IP))

This works fine but my problem is that this socket only receives packets
coming inbound from outside the system. What I need is to read ALL packets
coming in and going OUT. Is there a way to do this using the standard sockets
API or would it involve getting into the kernel code?

Thanks in advance for any help (please reply to newsgroup , not email address)

B2003