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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

#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 */