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ip_opts.h

/* ip_opts.h
 * Definitions of structures and routines for dissection of options that
 * work like IPv4 or IPv6 options
 *
 * $Id: ip_opts.h 18197 2006-05-21 05:12:17Z sahlberg $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef __IP_OPTS_H__
#define __IP_OPTS_H__

typedef enum {
  NO_LENGTH,            /* option has no data, hence no length */
  FIXED_LENGTH,         /* option always has the same length */
  VARIABLE_LENGTH /* option is variable-length - optlen is minimum */
} opt_len_type;

/* Member of table of IP or TCP options. */
typedef struct ip_tcp_opt {
  int   optcode;  /* code for option */
  const char  *name;    /* name of option */
  int   *subtree_index; /* pointer to subtree index for option */
  opt_len_type len_type; /* type of option length field */
  int optlen;           /* value length should be (minimum if VARIABLE) */
  void      (*dissect)(const struct ip_tcp_opt *, tvbuff_t *, int, guint,
               packet_info *, proto_tree *);
                  /* routine to dissect option */
} ip_tcp_opt;

/* Routine to dissect options that work like IPv4 options, where the
   length field in the option, if present, includes the type and
   length bytes. */
extern void dissect_ip_tcp_options(tvbuff_t *, int, guint,
    const ip_tcp_opt *, int, int, packet_info *, proto_tree *);

/* Routine to dissect options that work like IPv6 options, where the
   length field in the option, if present, includes only the data, not
   the type and length bytes. */
extern void dissect_ipv6_options(tvbuff_t *, int, guint,
    const ip_tcp_opt *, int, int, packet_info *, proto_tree *);

#endif

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