Getting packets MAC source address in if_ethersubr.c
julian at elischer.org
Mon Oct 6 06:04:55 UTC 2008
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.
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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..
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