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 <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
  85 struct 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
 110 static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
 111 {
 112         return (struct iphdr *)skb_network_header(skb);
 113 }
 114
 115 static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
 116 {
 117         return (struct iphdr *)skb_transport_header(skb);
 118 }
 119 #endif
 120
 121 struct 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
 130 struct 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
 136 struct ip_comp_hdr {
 137         __u8 nexthdr;
 138         __u8 flags;
 139         __be16 cpi;
 140 };
 141
 142 struct ip_beet_phdr {
 143         __u8 nexthdr;
 144         __u8 hdrlen;
 145         __u8 padlen;
 146         __u8 reserved;
 147 };
 148
 149 #endif  /* _LINUX_IP_H */