Date: Mon, 6 Oct 2008 14:48:14 +0300 From: Gleb Kurtsou <gleb.kurtsou@gmail.com> To: Julian Elischer <julian@elischer.org> Cc: Ryan French <rfrench@freebsd.org>, freebsd-net@freebsd.org Subject: Re: Getting packets MAC source address in if_ethersubr.c Message-ID: <20081006114814.GB3497@rybacik> In-Reply-To: <48E9AA84.90804@elischer.org> References: <200810061730.23641.rfrench@freebsd.org> <48E9AA84.90804@elischer.org>
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On (06/10/2008 14:04), Julian Elischer wrote: > 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 > > _______________________________________________ > > freebsd-net@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-net > > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > > 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.. That's exactly what I did for Google Summer Of Code project this year http://wiki.freebsd.org/GlebKurtsov/Improving_layer2_filtering Ryan, you can have a look at first changesets in perforce and extract only functionality you need.
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