LXR linux-old/include/linux/ip.h

   1/*
   2 * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3 *              operating system.  INET is implemented using the  BSD Socket
   4 *              interface as the means of communication with the user level.
   5 *
   6 *              Definitions for the IP protocol.
   7 *
   8 * Version:     @(#)ip.h        1.0.2   04/28/93
   9 *
  10 * Authors:     Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11 *
  12 *              This program is free software; you can redistribute it and/or
  13 *              modify it under the terms of the GNU General Public License
  14 *              as published by the Free Software Foundation; either version
  15 *              2 of the License, or (at your option) any later version.
  16 */
  17#ifndef _LINUX_IP_H
  18#define _LINUX_IP_H
  19#include <asm/byteorder.h>
  20
  21/* SOL_IP socket options */
  22
  23#define IPTOS_TOS_MASK          0x1E
  24#define IPTOS_TOS(tos)          ((tos)&IPTOS_TOS_MASK)
  25#define IPTOS_LOWDELAY          0x10
  26#define IPTOS_THROUGHPUT        0x08
  27#define IPTOS_RELIABILITY       0x04
  28#define IPTOS_MINCOST           0x02
  29
  30#define IPTOS_PREC_MASK         0xE0
  31#define IPTOS_PREC(tos)         ((tos)&IPTOS_PREC_MASK)
  32#define IPTOS_PREC_NETCONTROL           0xe0
  33#define IPTOS_PREC_INTERNETCONTROL      0xc0
  34#define IPTOS_PREC_CRITIC_ECP           0xa0
  35#define IPTOS_PREC_FLASHOVERRIDE        0x80
  36#define IPTOS_PREC_FLASH                0x60
  37#define IPTOS_PREC_IMMEDIATE            0x40
  38#define IPTOS_PREC_PRIORITY             0x20
  39#define IPTOS_PREC_ROUTINE              0x00
  40
  41
  42/* IP options */
  43#define IPOPT_COPY              0x80
  44#define IPOPT_CLASS_MASK        0x60
  45#define IPOPT_NUMBER_MASK       0x1f
  46
  47#define IPOPT_COPIED(o)         ((o)&IPOPT_COPY)
  48#define IPOPT_CLASS(o)          ((o)&IPOPT_CLASS_MASK)
  49#define IPOPT_NUMBER(o)         ((o)&IPOPT_NUMBER_MASK)
  50
  51#define IPOPT_CONTROL           0x00
  52#define IPOPT_RESERVED1         0x20
  53#define IPOPT_MEASUREMENT       0x40
  54#define IPOPT_RESERVED2         0x60
  55
  56#define IPOPT_END       (0 |IPOPT_CONTROL)
  57#define IPOPT_NOOP      (1 |IPOPT_CONTROL)
  58#define IPOPT_SEC       (2 |IPOPT_CONTROL|IPOPT_COPY)
  59#define IPOPT_LSRR      (3 |IPOPT_CONTROL|IPOPT_COPY)
  60#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
  61#define IPOPT_RR        (7 |IPOPT_CONTROL)
  62#define IPOPT_SID       (8 |IPOPT_CONTROL|IPOPT_COPY)
  63#define IPOPT_SSRR      (9 |IPOPT_CONTROL|IPOPT_COPY)
  64#define IPOPT_RA        (20|IPOPT_CONTROL|IPOPT_COPY)
  65
  66#define IPVERSION       4
  67#define MAXTTL          255
  68#define IPDEFTTL        64
  69
  70/* struct timestamp, struct route and MAX_ROUTES are removed.
  71
  72   REASONS: it is clear that nobody used them because:
  73   - MAX_ROUTES value was wrong.
  74   - "struct route" was wrong.
  75   - "struct timestamp" had fatally misaligned bitfields and was completely unusable.
  76 */
  77
  78#define IPOPT_OPTVAL 0
  79#define IPOPT_OLEN   1
  80#define IPOPT_OFFSET 2
  81#define IPOPT_MINOFF 4
  82#define MAX_IPOPTLEN 40
  83#define IPOPT_NOP IPOPT_NOOP
  84#define IPOPT_EOL IPOPT_END
  85#define IPOPT_TS  IPOPT_TIMESTAMP
  86
  87#define IPOPT_TS_TSONLY         0               /* timestamps only */
  88#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  89#define IPOPT_TS_PRESPEC        3               /* specified modules only */
  90
  91#ifdef __KERNEL__
  92
  93struct ip_options {
  94  __u32         faddr;                          /* Saved first hop address */
  95  unsigned char optlen;
  96  unsigned char srr;
  97  unsigned char rr;
  98  unsigned char ts;
  99  unsigned char is_setbyuser:1,                 /* Set by setsockopt?                   */
 100                is_data:1,                      /* Options in __data, rather than skb   */
 101                is_strictroute:1,               /* Strict source route                  */
 102                srr_is_hit:1,                   /* Packet destination addr was our one  */
 103                is_changed:1,                   /* IP checksum more not valid           */      
 104                rr_needaddr:1,                  /* Need to record addr of outgoing dev  */
 105                ts_needtime:1,                  /* Need to record timestamp             */
 106                ts_needaddr:1;                  /* Need to record addr of outgoing dev  */
 107  unsigned char router_alert;
 108  unsigned char __pad1;
 109  unsigned char __pad2;
 110  unsigned char __data[0];
 111};
 112
 113#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
 114#endif
 115
 116struct iphdr {
 117#if defined(__LITTLE_ENDIAN_BITFIELD)
 118        __u8    ihl:4,
 119                version:4;
 120#elif defined (__BIG_ENDIAN_BITFIELD)
 121        __u8    version:4,
 122                ihl:4;
 123#else
 124#error  "Please fix <asm/byteorder.h>"
 125#endif
 126        __u8    tos;
 127        __u16   tot_len;
 128        __u16   id;
 129        __u16   frag_off;
 130        __u8    ttl;
 131        __u8    protocol;
 132        __u16   check;
 133        __u32   saddr;
 134        __u32   daddr;
 135        /*The options start here. */
 136};
 137
 138#endif  /* _LINUX_IP_H */
 139