/*
   * 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

  #include <linux/types.h>

  #include <asm/byteorder.h>
  
  #define IPTOS_TOS_MASK		0x1E
  #define IPTOS_TOS(tos)		((tos)&IPTOS_TOS_MASK)
  #define	IPTOS_LOWDELAY		0x10
  #define	IPTOS_THROUGHPUT	0x08
  #define	IPTOS_RELIABILITY	0x04
  #define	IPTOS_MINCOST		0x02
  
  #define IPTOS_PREC_MASK		0xE0
  #define IPTOS_PREC(tos)		((tos)&IPTOS_PREC_MASK)
  #define IPTOS_PREC_NETCONTROL           0xe0
  #define IPTOS_PREC_INTERNETCONTROL      0xc0
  #define IPTOS_PREC_CRITIC_ECP           0xa0
  #define IPTOS_PREC_FLASHOVERRIDE        0x80
  #define IPTOS_PREC_FLASH                0x60
  #define IPTOS_PREC_IMMEDIATE            0x40
  #define IPTOS_PREC_PRIORITY             0x20
  #define IPTOS_PREC_ROUTINE              0x00
  
  
  /* IP options */
  #define IPOPT_COPY		0x80
  #define IPOPT_CLASS_MASK	0x60
  #define IPOPT_NUMBER_MASK	0x1f
  
  #define	IPOPT_COPIED(o)		((o)&IPOPT_COPY)
  #define	IPOPT_CLASS(o)		((o)&IPOPT_CLASS_MASK)
  #define	IPOPT_NUMBER(o)		((o)&IPOPT_NUMBER_MASK)
  
  #define	IPOPT_CONTROL		0x00
  #define	IPOPT_RESERVED1		0x20
  #define	IPOPT_MEASUREMENT	0x40
  #define	IPOPT_RESERVED2		0x60
  
  #define IPOPT_END	(0 |IPOPT_CONTROL)
  #define IPOPT_NOOP	(1 |IPOPT_CONTROL)
  #define IPOPT_SEC	(2 |IPOPT_CONTROL|IPOPT_COPY)
  #define IPOPT_LSRR	(3 |IPOPT_CONTROL|IPOPT_COPY)
  #define IPOPT_TIMESTAMP	(4 |IPOPT_MEASUREMENT)

  #define IPOPT_CIPSO	(6 |IPOPT_CONTROL|IPOPT_COPY)

  #define IPOPT_RR	(7 |IPOPT_CONTROL)
  #define IPOPT_SID	(8 |IPOPT_CONTROL|IPOPT_COPY)
  #define IPOPT_SSRR	(9 |IPOPT_CONTROL|IPOPT_COPY)
  #define IPOPT_RA	(20|IPOPT_CONTROL|IPOPT_COPY)
  
  #define IPVERSION	4
  #define MAXTTL		255
  #define IPDEFTTL	64
  
  #define IPOPT_OPTVAL 0
  #define IPOPT_OLEN   1
  #define IPOPT_OFFSET 2
  #define IPOPT_MINOFF 4
  #define MAX_IPOPTLEN 40
  #define IPOPT_NOP IPOPT_NOOP
  #define IPOPT_EOL IPOPT_END
  #define IPOPT_TS  IPOPT_TIMESTAMP
  
  #define	IPOPT_TS_TSONLY		0		/* timestamps only */
  #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
  #define	IPOPT_TS_PRESPEC	3		/* specified modules only */

  #define IPV4_BEET_PHMAXLEN 8

  struct iphdr {
  #if defined(__LITTLE_ENDIAN_BITFIELD)
  	__u8	ihl:4,
  		version:4;
  #elif defined (__BIG_ENDIAN_BITFIELD)
  	__u8	version:4,
    		ihl:4;
  #else
  #error	"Please fix <asm/byteorder.h>"
  #endif
  	__u8	tos;

  	__be16	tot_len;
  	__be16	id;
  	__be16	frag_off;

  	__u8	ttl;
  	__u8	protocol;

  	__sum16	check;

  	__be32	saddr;
  	__be32	daddr;

  	/*The options start here. */
  };

  #ifdef __KERNEL__
  #include <linux/skbuff.h>
  
  static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
  {
  	return (struct iphdr *)skb_network_header(skb);
  }

  
  static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
  {

  	return (struct iphdr *)skb_transport_header(skb);

  }

  #endif

  struct ip_auth_hdr {
  	__u8  nexthdr;
  	__u8  hdrlen;		/* This one is measured in 32 bit units! */

  	__be16 reserved;
  	__be32 spi;
  	__be32 seq_no;		/* Sequence number */

  	__u8  auth_data[0];	/* Variable len but >=4. Mind the 64 bit alignment! */
  };
  
  struct ip_esp_hdr {

  	__be32 spi;
  	__be32 seq_no;		/* Sequence number */

  	__u8  enc_data[0];	/* Variable len but >=8. Mind the 64 bit alignment! */
  };
  
  struct ip_comp_hdr {
  	__u8 nexthdr;
  	__u8 flags;

  	__be16 cpi;

  };

  struct ip_beet_phdr {
  	__u8 nexthdr;
  	__u8 hdrlen;
  	__u8 padlen;
  	__u8 reserved;
  };

  #endif	/* _LINUX_IP_H */