ip.h

* A ncurses user interface. * Network statistics to view the amount of packets and data in many

/*

  This file is part of sniffer, a packet capture utility and
  network moniter
  The author can be contacted at <[e-mail]>
  the lastest version is avilable from 
  http://stev.org

  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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef _SNIFF_IP_H
#define _SNIFF_IP_H

#include <sys/socket.h>

#include "sniff.h"
#include "stat.h"

#define IP_DF           0x4000
#define IP_MF           0x2000
#define IP_OFFSET       0x1FFF

/* define different ip protocols */

#define IP_ICMP 1		/* Internet Control Message Protocol	*/
#define IP_IGMP 2		/* Internet Group Management Protocol	*/
#define IP_IPIP 4		/* IPIP tunnels (older KA9Q tunnels use 94) */
#define IP_TCP  6		/* Transmission Control Protocol	*/
#define IP_EGP  8		/* Exterior Gateway Protocol		*/
#define IP_PUP  12		/* PUP protocol				*/
#define IP_UDP  17		/* User Datagram Protocol		*/
#define IP_IDP  22		/* XNS IDP protocol			*/
#define IP_RSVP 46		/* RSVP protocol			*/
#define IP_GRE  47		/* Cisco GRE tunnels (rfc 1701,1702)	*/
#define IP_IPV6 41		/* IPv6-in-IPv4 tunnelling		*/
#define IP_PIM  103		/* Protocol Independent Multicast	*/
#define IP_ESP  50		/* Encapsulation Security Payload protocol */
#define IP_AH   51		/* Authentication Header protocol       */
#define IP_COMP 108		/* Compression Header protocol */

struct pkt_ip {
#if defined(LITTLE_ENDIAN)
	unsigned char	ihl:4,
			version:4;
#elif defined (BIG_ENDIAN)
	unsigned char	version:4,
			ihl:4;
#else
#error  "Please define LITTLE_ENDIAN OR BIG_ENDIAN"
#endif
	unsigned char	tos;
	unsigned short	tot_len;
	unsigned short	id;
	unsigned short	frag_off;
	unsigned char	ttl;
	unsigned char	protocol;
	unsigned short	check;
	unsigned long	saddr;
	unsigned long	daddr;
	/*The options start here. */
};

extern struct gen_stat ip_stat;

extern int ip_handle (struct sniff_pkt *pkt, struct pkt_ip *ip);
extern inline unsigned short ip_cksum(unsigned short *buff, int len);

#endif /* _SNIFF_IP_H */