1 /* $FreeBSD$ */ 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 const char rcsid[] = "@(#)$Id$"; 10 #endif 11 12 #include "ipf.h" 13 14 void 15 nat_setgroupmap(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