linux/include/linux/ip.h
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   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 <linux/types.h>
  20#include <asm/byteorder.h>
  21
  22#define IPTOS_TOS_MASK          0x1E
  23#define IPTOS_TOS(tos)          ((tos)&IPTOS_TOS_MASK)
  24#define IPTOS_LOWDELAY          0x10
  25#define IPTOS_THROUGHPUT        0x08
  26#define IPTOS_RELIABILITY       0x04
  27#define IPTOS_MINCOST           0x02
  28
  29#define IPTOS_PREC_MASK         0xE0
  30#define IPTOS_PREC(tos)         ((tos)&IPTOS_PREC_MASK)
  31#define IPTOS_PREC_NETCONTROL           0xe0
  32#define IPTOS_PREC_INTERNETCONTROL      0xc0
  33#define IPTOS_PREC_CRITIC_ECP           0xa0
  34#define IPTOS_PREC_FLASHOVERRIDE        0x80
  35#define IPTOS_PREC_FLASH                0x60
  36#define IPTOS_PREC_IMMEDIATE            0x40
  37#define IPTOS_PREC_PRIORITY             0x20
  38#define IPTOS_PREC_ROUTINE              0x00
  39
  40
  41/* IP options */
  42#define IPOPT_COPY              0x80
  43#define IPOPT_CLASS_MASK        0x60
  44#define IPOPT_NUMBER_MASK       0x1f
  45
  46#define IPOPT_COPIED(o)         ((o)&IPOPT_COPY)
  47#define IPOPT_CLASS(o)          ((o)&IPOPT_CLASS_MASK)
  48#define IPOPT_NUMBER(o)         ((o)&IPOPT_NUMBER_MASK)
  49
  50#define IPOPT_CONTROL           0x00
  51#define IPOPT_RESERVED1         0x20
  52#define IPOPT_MEASUREMENT       0x40
  53#define IPOPT_RESERVED2         0x60
  54
  55#define IPOPT_END       (0 |IPOPT_CONTROL)
  56#define IPOPT_NOOP      (1 |IPOPT_CONTROL)
  57#define IPOPT_SEC       (2 |IPOPT_CONTROL|IPOPT_COPY)
  58#define IPOPT_LSRR      (3 |IPOPT_CONTROL|IPOPT_COPY)
  59#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
  60#define IPOPT_CIPSO     (6 |IPOPT_CONTROL|IPOPT_COPY)
  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#define IPOPT_OPTVAL 0
  71#define IPOPT_OLEN   1
  72#define IPOPT_OFFSET 2
  73#define IPOPT_MINOFF 4
  74#define MAX_IPOPTLEN 40
  75#define IPOPT_NOP IPOPT_NOOP
  76#define IPOPT_EOL IPOPT_END
  77#define IPOPT_TS  IPOPT_TIMESTAMP
  78
  79#define IPOPT_TS_TSONLY         0               /* timestamps only */
  80#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  81#define IPOPT_TS_PRESPEC        3               /* specified modules only */
  82
  83#define IPV4_BEET_PHMAXLEN 8
  84
  85struct iphdr {
  86#if defined(__LITTLE_ENDIAN_BITFIELD)
  87        __u8    ihl:4,
  88                version:4;
  89#elif defined (__BIG_ENDIAN_BITFIELD)
  90        __u8    version:4,
  91                ihl:4;
  92#else
  93#error  "Please fix <asm/byteorder.h>"
  94#endif
  95        __u8    tos;
  96        __be16  tot_len;
  97        __be16  id;
  98        __be16  frag_off;
  99        __u8    ttl;
 100        __u8    protocol;
 101        __sum16 check;
 102        __be32  saddr;
 103        __be32  daddr;
 104        /*The options start here. */
 105};
 106
 107#ifdef __KERNEL__
 108#include <linux/skbuff.h>
 109
 110static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
 111{
 112        return (struct iphdr *)skb_network_header(skb);
 113}
 114
 115static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
 116{
 117        return (struct iphdr *)skb_transport_header(skb);
 118}
 119#endif
 120
 121struct ip_auth_hdr {
 122        __u8  nexthdr;
 123        __u8  hdrlen;           /* This one is measured in 32 bit units! */
 124        __be16 reserved;
 125        __be32 spi;
 126        __be32 seq_no;          /* Sequence number */
 127        __u8  auth_data[0];     /* Variable len but >=4. Mind the 64 bit alignment! */
 128};
 129
 130struct ip_esp_hdr {
 131        __be32 spi;
 132        __be32 seq_no;          /* Sequence number */
 133        __u8  enc_data[0];      /* Variable len but >=8. Mind the 64 bit alignment! */
 134};
 135
 136struct ip_comp_hdr {
 137        __u8 nexthdr;
 138        __u8 flags;
 139        __be16 cpi;
 140};
 141
 142struct ip_beet_phdr {
 143        __u8 nexthdr;
 144        __u8 hdrlen;
 145        __u8 padlen;
 146        __u8 reserved;
 147};
 148
 149#endif  /* _LINUX_IP_H */
 150
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