[tproxy] udp + tproxy

Andrey Luzgin andrey at icomsw.com
Wed Nov 12 12:40:30 CET 2008


While I can see example of using udp on tproxy2 onto the
file, I can't find equivalent on tproxy4.

For getting the original destination IP, I just use setsockopt
setsockopt(sd, SOL_IP, IP_PKTINFO , &flags, sizeof(flags));

But I don't know how to get the original destination port:

a) I manually defined IP_RECVORIGADDRS  to be 11273 as I find on
setsockopt(sd, SOL_IP, IP_RECVORIGADDRS , &flags, sizeof(flags));
but the setsockopt failed.

b) the getsockname give me the server listening port.

Here are my iptables\ip route redirection lines:
${iptables} -t mangle -N DIVERT
${iptables} -t mangle -A PREROUTING -p udp -m socket -j DIVERT
${iptables} -t mangle -A DIVERT -j MARK --set-mark 1
${iptables} -t mangle -A DIVERT -j ACCEPT
${iptables} -t mangle -A PREROUTING -p udp --dport 1500 -j TPROXY
--tproxy-mark 1 --on-port 3127

ip rule add fwmark 1 lookup 100
ip route add local dev lo table 100

What is missed?


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