1/*	$FreeBSD$	*/
2
3/*
4 * Copyright (C) 2003 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 */
8#if !defined(lint)
9static const char rcsid[] = "@(#)$Id: nat_setgroupmap.c,v 1.1.4.1 2006/06/16 17:21:07 darrenr Exp $";
10#endif
11
12#include "ipf.h"
13
14void nat_setgroupmap(n)
15ipnat_t *n;
16{
17	if (n->in_outmsk == n->in_inmsk)
18		n->in_ippip = 1;
19	else if (n->in_flags & IPN_AUTOPORTMAP) {
20		n->in_ippip = ~ntohl(n->in_inmsk);
21		if (n->in_outmsk != 0xffffffff)
22			n->in_ippip /= (~ntohl(n->in_outmsk) + 1);
23		n->in_ippip++;
24		if (n->in_ippip == 0)
25			n->in_ippip = 1;
26		n->in_ppip = USABLE_PORTS / n->in_ippip;
27	} else {
28		n->in_space = USABLE_PORTS * ~ntohl(n->in_outmsk);
29		n->in_nip = 0;
30		if (!(n->in_ppip = n->in_pmin))
31			n->in_ppip = 1;
32		n->in_ippip = USABLE_PORTS / n->in_ppip;
33	}
34}
35