epan/addr_and_mask.h

   1 /* addr_and_mask.h
   2  * Declarations of routines to fetch IPv4 and IPv6 addresses from a tvbuff
   3  * and then mask out bits other than those covered by a prefix length
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #ifndef __ADDR_AND_MASK_H__
  27 #define __ADDR_AND_MASK_H__
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif /* __cplusplus */
  32
  33 /*
  34  * These routines return PREFIX_LEN_OK on success, PREFIX_LEN_TOO_LONG if
  35  * the prefix length is too long, and PREFIX_LEN_ZERO if the prefix length
  36  * is 0.
  37  */
  38
  39 #define PREFIX_LEN_OK           0
  40 #define PREFIX_LEN_TOO_LONG     1
  41 #define PREFIX_LEN_ZERO         2
  42
  43 extern int ipv4_addr_and_mask(tvbuff_t *tvb, int offset, guint8 *addr,
  44     guint32 prefix_len);
  45
  46 extern int ipv6_addr_and_mask(tvbuff_t *tvb, int offset,
  47     struct e_in6_addr *addr, guint32 prefix_len);
  48
  49 guint32 ip_get_subnet_mask(const guint32 mask_length);
  50
  51 #ifdef __cplusplus
  52 }
  53 #endif /* __cplusplus */
  54
  55 #endif /* __ADDR_AND_MASK_H__  */