any support for udp

[madhanraj]

I am trying to redirect the udp packet to particular port where I run
my proxy (SOCKS) . I am supposed to obtain the original destination
ipaddress of the client to add to the data field of socks message as
per the RFC .

However , when I use REDIRECT chain as it sets the dest addr to the LO
address i get the LO address 127.0.0.1 and the port where socks proxy
client runs .

I tried patching SO_ORIGINAL_DST to obtain for UDP protocol also . In
this case it would work if I use single FD for single dest . However
when I use single FD for multiple connection it might not work .

I cannot add as part of rsvmsg , as I have to send to the proxy server
in advance .

TPROXY works in prerouting , I am not sure how we use in the client
side to send the first packet with the dest address . (I am not sure
about the TPROXYing though)

Can you please suggest the method to overcome the problem . Thanks in advance.

[vi]

I also tried to make "UDP proxy" like tcprelay, but for UDP using TPROXY in the past, but failed.

I can try again later. I'll report here if anything useful comples out.