NAT delay

NAT was not as easy to implement as I thought it was and I did not finish this weekend. The main part I had problems with was setting up the NAT table itself. While editing the headers is not too hard, I overlooked what it took to implement the NAT table itself. What I realized is needed is a separate add, delete, and search function for the NAT table. One of these functions should also be capable of recycling entries which are not used (because the table itself is static). For now, here is what I propose for each function:

int add(IP, port): Adds entry to NAT table.
                          Returns the new port that is assigned to this IP and port combo.
void delete ( IP, port): Will delete an entry from the NAT table.
                              ***Not sure if this is needed if there is a recycle function built into add***
NATOBJECT lookup(IP, port): Will search through the table for the IP and port combo and return the entry.

I am going to try to model this after the existing routing and ARP tables except my implementation will be a lot more basic.