contrib/ipfilter/lib/nat_setgroupmap.c

   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 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 }