LXR linux-bk/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#define IPTOS_TOS_MASK          0x1E
  22#define IPTOS_TOS(tos)          ((tos)&IPTOS_TOS_MASK)
  23#define IPTOS_LOWDELAY          0x10
  24#define IPTOS_THROUGHPUT        0x08
  25#define IPTOS_RELIABILITY       0x04
  26#define IPTOS_MINCOST           0x02
  27
  28#define IPTOS_PREC_MASK         0xE0
  29#define IPTOS_PREC(tos)         ((tos)&IPTOS_PREC_MASK)
  30#define IPTOS_PREC_NETCONTROL           0xe0
  31#define IPTOS_PREC_INTERNETCONTROL      0xc0
  32#define IPTOS_PREC_CRITIC_ECP           0xa0
  33#define IPTOS_PREC_FLASHOVERRIDE        0x80
  34#define IPTOS_PREC_FLASH                0x60
  35#define IPTOS_PREC_IMMEDIATE            0x40
  36#define IPTOS_PREC_PRIORITY             0x20
  37#define IPTOS_PREC_ROUTINE              0x00
  38
  39
  40/* IP options */
  41#define IPOPT_COPY              0x80
  42#define IPOPT_CLASS_MASK        0x60
  43#define IPOPT_NUMBER_MASK       0x1f
  44
  45#define IPOPT_COPIED(o)         ((o)&IPOPT_COPY)
  46#define IPOPT_CLASS(o)          ((o)&IPOPT_CLASS_MASK)
  47#define IPOPT_NUMBER(o)         ((o)&IPOPT_NUMBER_MASK)
  48
  49#define IPOPT_CONTROL           0x00
  50#define IPOPT_RESERVED1         0x20
  51#define IPOPT_MEASUREMENT       0x40
  52#define IPOPT_RESERVED2         0x60
  53
  54#define IPOPT_END       (0 |IPOPT_CONTROL)
  55#define IPOPT_NOOP      (1 |IPOPT_CONTROL)
  56#define IPOPT_SEC       (2 |IPOPT_CONTROL|IPOPT_COPY)
  57#define IPOPT_LSRR      (3 |IPOPT_CONTROL|IPOPT_COPY)
  58#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
  59#define IPOPT_RR        (7 |IPOPT_CONTROL)
  60#define IPOPT_SID       (8 |IPOPT_CONTROL|IPOPT_COPY)
  61#define IPOPT_SSRR      (9 |IPOPT_CONTROL|IPOPT_COPY)
  62#define IPOPT_RA        (20|IPOPT_CONTROL|IPOPT_COPY)
  63
  64#define IPVERSION       4
  65#define MAXTTL          255
  66#define IPDEFTTL        64
  67
  68#define IPOPT_OPTVAL 0
  69#define IPOPT_OLEN   1
  70#define IPOPT_OFFSET 2
  71#define IPOPT_MINOFF 4
  72#define MAX_IPOPTLEN 40
  73#define IPOPT_NOP IPOPT_NOOP
  74#define IPOPT_EOL IPOPT_END
  75#define IPOPT_TS  IPOPT_TIMESTAMP
  76
  77#define IPOPT_TS_TSONLY         0               /* timestamps only */
  78#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
  79#define IPOPT_TS_PRESPEC        3               /* specified modules only */
  80
  81#ifdef __KERNEL__
  82#include <linux/config.h>
  83#include <linux/types.h>
  84#include <net/sock.h>
  85#include <linux/igmp.h>
  86#include <net/flow.h>
  87
  88struct ip_options {
  89  __u32         faddr;                          /* Saved first hop address */
  90  unsigned char optlen;
  91  unsigned char srr;
  92  unsigned char rr;
  93  unsigned char ts;
  94  unsigned char is_setbyuser:1,                 /* Set by setsockopt?                   */
  95                is_data:1,                      /* Options in __data, rather than skb   */
  96                is_strictroute:1,               /* Strict source route                  */
  97                srr_is_hit:1,                   /* Packet destination addr was our one  */
  98                is_changed:1,                   /* IP checksum more not valid           */      
  99                rr_needaddr:1,                  /* Need to record addr of outgoing dev  */
 100                ts_needtime:1,                  /* Need to record timestamp             */
 101                ts_needaddr:1;                  /* Need to record addr of outgoing dev  */
 102  unsigned char router_alert;
 103  unsigned char __pad1;
 104  unsigned char __pad2;
 105  unsigned char __data[0];
 106};
 107
 108#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
 109
 110struct inet_opt {
 111        /* Socket demultiplex comparisons on incoming packets. */
 112        __u32                   daddr;          /* Foreign IPv4 addr */
 113        __u32                   rcv_saddr;      /* Bound local IPv4 addr */
 114        __u16                   dport;          /* Destination port */
 115        __u16                   num;            /* Local port */
 116        __u32                   saddr;          /* Sending source */
 117        int                     uc_ttl;         /* Unicast TTL */
 118        int                     tos;            /* TOS */
 119        unsigned                cmsg_flags;
 120        struct ip_options       *opt;
 121        __u16                   sport;          /* Source port */
 122        unsigned char           hdrincl;        /* Include headers ? */
 123        __u8                    mc_ttl;         /* Multicasting TTL */
 124        __u8                    mc_loop;        /* Loopback */
 125        __u8                    pmtudisc;
 126        __u16                   id;             /* ID counter for DF pkts */
 127        unsigned                recverr : 1,
 128                                freebind : 1;
 129        int                     mc_index;       /* Multicast device index */
 130        __u32                   mc_addr;
 131        struct ip_mc_socklist   *mc_list;       /* Group array */
 132        struct page             *sndmsg_page;   /* Cached page for sendmsg */
 133        u32                     sndmsg_off;     /* Cached offset for sendmsg */
 134        /*
 135         * Following members are used to retain the infomation to build
 136         * an ip header on each ip fragmentation while the socket is corked.
 137         */
 138        struct {
 139                unsigned int            flags;
 140                unsigned int            fragsize;
 141                struct ip_options       *opt;
 142                struct rtable           *rt;
 143                int                     length; /* Total length of all frames */
 144                u32                     addr;
 145                struct flowi            fl;
 146        } cork;
 147};
 148
 149#define IPCORK_OPT      1       /* ip-options has been held in ipcork.opt */
 150
 151struct ipv6_pinfo;
 152
 153/* WARNING: don't change the layout of the members in inet_sock! */
 154struct inet_sock {
 155        struct sock       sk;
 156#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 157        struct ipv6_pinfo *pinet6;
 158#endif
 159        struct inet_opt   inet;
 160};
 161
 162static inline struct inet_opt * inet_sk(const struct sock *__sk)
 163{
 164        return &((struct inet_sock *)__sk)->inet;
 165}
 166
 167#endif
 168
 169struct iphdr {
 170#if defined(__LITTLE_ENDIAN_BITFIELD)
 171        __u8    ihl:4,
 172                version:4;
 173#elif defined (__BIG_ENDIAN_BITFIELD)
 174        __u8    version:4,
 175                ihl:4;
 176#else
 177#error  "Please fix <asm/byteorder.h>"
 178#endif
 179        __u8    tos;
 180        __u16   tot_len;
 181        __u16   id;
 182        __u16   frag_off;
 183        __u8    ttl;
 184        __u8    protocol;
 185        __u16   check;
 186        __u32   saddr;
 187        __u32   daddr;
 188        /*The options start here. */
 189};
 190
 191struct ip_auth_hdr {
 192        __u8  nexthdr;
 193        __u8  hdrlen;           /* This one is measured in 32 bit units! */
 194        __u16 reserved;
 195        __u32 spi;
 196        __u32 seq_no;           /* Sequence number */
 197        __u8  auth_data[0];     /* Variable len but >=4. Mind the 64 bit alignment! */
 198};
 199
 200struct ip_esp_hdr {
 201        __u32 spi;
 202        __u32 seq_no;           /* Sequence number */
 203        __u8  enc_data[0];      /* Variable len but >=8. Mind the 64 bit alignment! */
 204};
 205
 206struct ip_comp_hdr {
 207        __u8 nexthdr;
 208        __u8 flags;
 209        __u16 cpi;
 210};
 211
 212#endif  /* _LINUX_IP_H */
 213