ip.h

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/**
*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              Definitions for the IP protocol.
 *
 * Version:     @(#)ip.h        1.0.2   04/28/93
 *
 * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.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.


*/
#ifndef _LINUX_IP_H
#define _LINUX_IP_H


#define IPOPT_END       0
#define IPOPT_NOOP      1
#define IPOPT_SEC       130
#define IPOPT_LSRR      131
#define IPOPT_SSRR      137
#define IPOPT_RR        7
#define IPOPT_SID       136
#define IPOPT_TIMESTAMP 68


struct timestamp {
  unsigned char len;
  unsigned char ptr;
  union {
        unsigned char   flags:4,
                        overflow:4;
        unsigned char   full_char;
  } x;
  unsigned long data[9];
};


#define MAX_ROUTE       16

struct route {
  char          route_size;
  char          pointer;
  unsigned long route[MAX_ROUTE];
};


struct options {
  struct route          record_route;
  struct route          loose_route;
  struct route          strict_route;
  struct timestamp      tstamp;
  unsigned short        security;
  unsigned short        compartment;
  unsigned short        handling;
  unsigned short        stream;
  unsigned              tcc;
};


struct iphdr {
  unsigned char         ihl:4,
                        version:4;
  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. 
};


#endif  // _LINUX_IP_H 

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