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, <[email protected]>
 *
 *      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 _UAPI_LINUX_IP_H
#define _UAPI_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. */
};


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 /* _UAPI_LINUX_IP_H */