Getting packets MAC source address in if_ethersubr.c

[Julian Elischer]

Ryan French wrote:
> 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
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You could create a tag type that holds a layer 2 address, and attach 
it to the packet on ingresss,

it should stay with the packet as long as it's not destroyed..
then on egress you could find it and use it..