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      1 /*	$NetBSD: nat_setgroupmap.c,v 1.3 2018/02/04 08:19:42 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 2012 by Darren Reed.
      5  *
      6  * See the IPFILTER.LICENCE file for details on licencing.
      7  */
      8 #if !defined(lint)
      9 static __attribute__((__used__)) const char rcsid[] = "@(#)Id: nat_setgroupmap.c,v 1.1.1.2 2012/07/22 13:44:39 darrenr Exp $";
     10 #endif
     11 
     12 #include "ipf.h"
     13 
     14 void nat_setgroupmap(n)
     15 	ipnat_t *n;
     16 {
     17 	if (n->in_nsrcmsk == n->in_osrcmsk)
     18 		n->in_ippip = 1;
     19 	else if (n->in_flags & IPN_AUTOPORTMAP) {
     20 		n->in_ippip = ~ntohl(n->in_osrcmsk);
     21 		if (n->in_nsrcmsk != 0xffffffff)
     22 			n->in_ippip /= (~ntohl(n->in_nsrcmsk) + 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_nsrcmsk);
     29 		n->in_snip = 0;
     30 		if (!(n->in_ppip = n->in_spmin))
     31 			n->in_ppip = 1;
     32 		n->in_ippip = USABLE_PORTS / n->in_ppip;
     33 	}
     34 }
     35