/*
 * Copyright (C) 2012 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 */

#include "ipf.h"

void
nat_setgroupmap(ipnat_t *n)
{
        if (n->in_nsrcmsk == n->in_osrcmsk)
                n->in_ippip = 1;
        else if (n->in_flags & IPN_AUTOPORTMAP) {
                n->in_ippip = ~ntohl(n->in_osrcmsk);
                if (n->in_nsrcmsk != 0xffffffff)
                        n->in_ippip /= (~ntohl(n->in_nsrcmsk) + 1);
                n->in_ippip++;
                if (n->in_ippip == 0)
                        n->in_ippip = 1;
                n->in_ppip = USABLE_PORTS / n->in_ippip;
        } else {
                n->in_space = USABLE_PORTS * ~ntohl(n->in_nsrcmsk);
                n->in_snip = 0;
                if (!(n->in_ppip = n->in_spmin))
                        n->in_ppip = 1;
                n->in_ippip = USABLE_PORTS / n->in_ppip;
        }
}