Getting packets MAC source address in if_ethersubr.c

[Ryan French]

Hi All,

For my implementation of MPLS I have just about run out of time for my 
dissertation so at the moment I am trying to create fake routing table 
entries e.t.c. rather than doing this properly (I will be doing this once uni 
is finished and I have more free time to work on it). I now have receiving, 
decoding and sending of packets working, except for one small problem. When I 
send a packet back out the MAC address is wrong. I am looking for a way in 
the ether_output function in if_ethersubr.c that I can get the MAC address of 
the source of the packet and then just send it back to that source. If anyone 
knows how to do this without having to use arpresolve or anything like that 
(the IP address of the destination is not going to be the same as the IP 
destination in the packet) or without having to setup a proper routing table 
then it would be much appreciated.

Thanks,
-Ryan