I have studied the netfilter/iptables code for serval months, but I can not understand the semantic meaning of function find_appropriate_src(), which is called by get_unique_tuple(). I can not figure in what situation it can return TRUE and I think even in the situation it can return TRUE, it is still meaningless. I designed and tried some DNAT/SNAT examples, but none of them can make find_appropriate_src() return TRUE. So, I wonder what is the object of designing the find_appropriate_src()? Thx!
