netfilter_queue reinjecting packets
aton at packetdropped.org
Sun Mar 12 15:10:54 CET 2006
has anyone used netfilter_queue and successfully re-injected packets into the net?
i want to write sort of a userspace routing application.
host A is my workstation, it has host B as default gateway.
on host B my routing application runs.
it receives packets from netfilter_queue using libnetfilter_queue.
this works very well and i can display the whole packets.
now i just want to send them back into the net, so that they reach their destination.
i modified the main loop in the source of nfqnl_test.c in the libnetfilter_queue package:
while ((rv=recv(fd, buf, sizeof(buf), 0)) >= 0)
printf("sending packet back\n");
if ((sv=send(fd, buf, sizeof(buf), 0))==-1)
this should send every packet back to... where?
it seems the packets are just sent into nirvana, i cannot sniff them, and i dont get an error from send().
is this the way to go, or should i make two raw sockets, one for tcp and one for udp packets and send the incoming packets on these?
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