On Fri, 27 Apr 2001, Karl Williams wrote: > Thanks for the idea. However, looking over the netfilter information, > it seems that I can only specify certain TCP fields to mangle. > I don't see where I can manipulate the checksum and/or data fields. > Am I missing something? > No, once you have a packet in userspace you have access to all the fields in tcp.h.. including checksum. > >You can obviously use Netfilter (netfilter.kernelnotes.org) with queueing > >rules in the OUTPUT chain. > > > >On Thu, 26 Apr 2001, Karl Williams wrote: > > > >> >> I need to replace the data field and the checksum field in a tcp packet with other information (not related to the socket or socket buffer). > >> > >> >Where is the packet originating from? Does it originate from a program on > >> >your computer, or some other machine addressed to your computer, or just > >> >forwarded through your computer? > >> > >> The packet itself is generated on my own machine. I assume it's using the TCP subroutines in the .../net/ipv4 directory. > > > > Get 250 color business cards for FREE! > http://businesscards.lycos.com/vp/fastpath/ > - > : send the line "unsubscribe linux-net" in > the body of a message to majordomo@vger.kernel.org > - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
