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How to route local traffic to a local transparent proxy?

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user795821

I have an application to use multi-ports to send packages. I hope that traffic from some port(e.g.8080) shouldn't be intercepted while traffic from other ports should be redirected to a local proxy( listening on port 15001 ). My iptables commands are as follows:

iptables -t nat -N TEST_OUTPUT
iptables -t nat -A OUTPUT -p tcp -j TEST_OUTPUT

iptables -t nat -A TEST_OUTPUT -p tcp --sport 8080 -j RETURN
iptables -t nat -A TEST_OUTPUT -m owner ! --uid-owner proxy -j REDIRECT --to-port 15001

I plan to implement the local proxy with Go, but it seems that iptables NAT change the dport of the packet. How I know the dport of the original packet? Is there an alternative way?

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