linux/include/linux/in.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 of the Internet Protocol.
   7 *
   8 * Version:     @(#)in.h        1.0.1   04/21/93
   9 *
  10 * Authors:     Original taken from the GNU Project <netinet/in.h> file.
  11 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12 *
  13 *              This program is free software; you can redistribute it and/or
  14 *              modify it under the terms of the GNU General Public License
  15 *              as published by the Free Software Foundation; either version
  16 *              2 of the License, or (at your option) any later version.
  17 */
  18#ifndef _LINUX_IN_H
  19#define _LINUX_IN_H
  20
  21#include <linux/types.h>
  22#include <linux/socket.h>
  23
  24/* Standard well-defined IP protocols.  */
  25enum {
  26  IPPROTO_IP = 0,               /* Dummy protocol for TCP               */
  27  IPPROTO_ICMP = 1,             /* Internet Control Message Protocol    */
  28  IPPROTO_IGMP = 2,             /* Internet Group Management Protocol   */
  29  IPPROTO_IPIP = 4,             /* IPIP tunnels (older KA9Q tunnels use 94) */
  30  IPPROTO_TCP = 6,              /* Transmission Control Protocol        */
  31  IPPROTO_EGP = 8,              /* Exterior Gateway Protocol            */
  32  IPPROTO_PUP = 12,             /* PUP protocol                         */
  33  IPPROTO_UDP = 17,             /* User Datagram Protocol               */
  34  IPPROTO_IDP = 22,             /* XNS IDP protocol                     */
  35  IPPROTO_DCCP = 33,            /* Datagram Congestion Control Protocol */
  36  IPPROTO_RSVP = 46,            /* RSVP protocol                        */
  37  IPPROTO_GRE = 47,             /* Cisco GRE tunnels (rfc 1701,1702)    */
  38
  39  IPPROTO_IPV6   = 41,          /* IPv6-in-IPv4 tunnelling              */
  40
  41  IPPROTO_ESP = 50,            /* Encapsulation Security Payload protocol */
  42  IPPROTO_AH = 51,             /* Authentication Header protocol       */
  43  IPPROTO_BEETPH = 94,         /* IP option pseudo header for BEET */
  44  IPPROTO_PIM    = 103,         /* Protocol Independent Multicast       */
  45
  46  IPPROTO_COMP   = 108,                /* Compression Header protocol */
  47  IPPROTO_SCTP   = 132,         /* Stream Control Transport Protocol    */
  48  IPPROTO_UDPLITE = 136,        /* UDP-Lite (RFC 3828)                  */
  49
  50  IPPROTO_RAW    = 255,         /* Raw IP packets                       */
  51  IPPROTO_MAX
  52};
  53
  54
  55/* Internet address. */
  56struct in_addr {
  57        __be32  s_addr;
  58};
  59
  60#define IP_TOS          1
  61#define IP_TTL          2
  62#define IP_HDRINCL      3
  63#define IP_OPTIONS      4
  64#define IP_ROUTER_ALERT 5
  65#define IP_RECVOPTS     6
  66#define IP_RETOPTS      7
  67#define IP_PKTINFO      8
  68#define IP_PKTOPTIONS   9
  69#define IP_MTU_DISCOVER 10
  70#define IP_RECVERR      11
  71#define IP_RECVTTL      12
  72#define IP_RECVTOS      13
  73#define IP_MTU          14
  74#define IP_FREEBIND     15
  75#define IP_IPSEC_POLICY 16
  76#define IP_XFRM_POLICY  17
  77#define IP_PASSSEC      18
  78#define IP_TRANSPARENT  19
  79
  80/* BSD compatibility */
  81#define IP_RECVRETOPTS  IP_RETOPTS
  82
  83/* TProxy original addresses */
  84#define IP_ORIGDSTADDR       20
  85#define IP_RECVORIGDSTADDR   IP_ORIGDSTADDR
  86
  87#define IP_MINTTL       21
  88#define IP_NODEFRAG     22
  89
  90/* IP_MTU_DISCOVER values */
  91#define IP_PMTUDISC_DONT                0       /* Never send DF frames */
  92#define IP_PMTUDISC_WANT                1       /* Use per route hints  */
  93#define IP_PMTUDISC_DO                  2       /* Always DF            */
  94#define IP_PMTUDISC_PROBE               3       /* Ignore dst pmtu      */
  95
  96#define IP_MULTICAST_IF                 32
  97#define IP_MULTICAST_TTL                33
  98#define IP_MULTICAST_LOOP               34
  99#define IP_ADD_MEMBERSHIP               35
 100#define IP_DROP_MEMBERSHIP              36
 101#define IP_UNBLOCK_SOURCE               37
 102#define IP_BLOCK_SOURCE                 38
 103#define IP_ADD_SOURCE_MEMBERSHIP        39
 104#define IP_DROP_SOURCE_MEMBERSHIP       40
 105#define IP_MSFILTER                     41
 106#define MCAST_JOIN_GROUP                42
 107#define MCAST_BLOCK_SOURCE              43
 108#define MCAST_UNBLOCK_SOURCE            44
 109#define MCAST_LEAVE_GROUP               45
 110#define MCAST_JOIN_SOURCE_GROUP         46
 111#define MCAST_LEAVE_SOURCE_GROUP        47
 112#define MCAST_MSFILTER                  48
 113#define IP_MULTICAST_ALL                49
 114#define IP_UNICAST_IF                   50
 115
 116#define MCAST_EXCLUDE   0
 117#define MCAST_INCLUDE   1
 118
 119/* These need to appear somewhere around here */
 120#define IP_DEFAULT_MULTICAST_TTL        1
 121#define IP_DEFAULT_MULTICAST_LOOP       1
 122
 123/* Request struct for multicast socket ops */
 124
 125struct ip_mreq  {
 126        struct in_addr imr_multiaddr;   /* IP multicast address of group */
 127        struct in_addr imr_interface;   /* local IP address of interface */
 128};
 129
 130struct ip_mreqn {
 131        struct in_addr  imr_multiaddr;          /* IP multicast address of group */
 132        struct in_addr  imr_address;            /* local IP address of interface */
 133        int             imr_ifindex;            /* Interface index */
 134};
 135
 136struct ip_mreq_source {
 137        __be32          imr_multiaddr;
 138        __be32          imr_interface;
 139        __be32          imr_sourceaddr;
 140};
 141
 142struct ip_msfilter {
 143        __be32          imsf_multiaddr;
 144        __be32          imsf_interface;
 145        __u32           imsf_fmode;
 146        __u32           imsf_numsrc;
 147        __be32          imsf_slist[1];
 148};
 149
 150#define IP_MSFILTER_SIZE(numsrc) \
 151        (sizeof(struct ip_msfilter) - sizeof(__u32) \
 152        + (numsrc) * sizeof(__u32))
 153
 154struct group_req {
 155        __u32                            gr_interface;  /* interface index */
 156        struct __kernel_sockaddr_storage gr_group;      /* group address */
 157};
 158
 159struct group_source_req {
 160        __u32                            gsr_interface; /* interface index */
 161        struct __kernel_sockaddr_storage gsr_group;     /* group address */
 162        struct __kernel_sockaddr_storage gsr_source;    /* source address */
 163};
 164
 165struct group_filter {
 166        __u32                            gf_interface;  /* interface index */
 167        struct __kernel_sockaddr_storage gf_group;      /* multicast address */
 168        __u32                            gf_fmode;      /* filter mode */
 169        __u32                            gf_numsrc;     /* number of sources */
 170        struct __kernel_sockaddr_storage gf_slist[1];   /* interface index */
 171};
 172
 173#define GROUP_FILTER_SIZE(numsrc) \
 174        (sizeof(struct group_filter) - sizeof(struct __kernel_sockaddr_storage) \
 175        + (numsrc) * sizeof(struct __kernel_sockaddr_storage))
 176
 177struct in_pktinfo {
 178        int             ipi_ifindex;
 179        struct in_addr  ipi_spec_dst;
 180        struct in_addr  ipi_addr;
 181};
 182
 183/* Structure describing an Internet (IP) socket address. */
 184#define __SOCK_SIZE__   16              /* sizeof(struct sockaddr)      */
 185struct sockaddr_in {
 186  __kernel_sa_family_t  sin_family;     /* Address family               */
 187  __be16                sin_port;       /* Port number                  */
 188  struct in_addr        sin_addr;       /* Internet address             */
 189
 190  /* Pad to size of `struct sockaddr'. */
 191  unsigned char         __pad[__SOCK_SIZE__ - sizeof(short int) -
 192                        sizeof(unsigned short int) - sizeof(struct in_addr)];
 193};
 194#define sin_zero        __pad           /* for BSD UNIX comp. -FvK      */
 195
 196
 197/*
 198 * Definitions of the bits in an Internet address integer.
 199 * On subnets, host and network parts are found according
 200 * to the subnet mask, not these masks.
 201 */
 202#define IN_CLASSA(a)            ((((long int) (a)) & 0x80000000) == 0)
 203#define IN_CLASSA_NET           0xff000000
 204#define IN_CLASSA_NSHIFT        24
 205#define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 206#define IN_CLASSA_MAX           128
 207
 208#define IN_CLASSB(a)            ((((long int) (a)) & 0xc0000000) == 0x80000000)
 209#define IN_CLASSB_NET           0xffff0000
 210#define IN_CLASSB_NSHIFT        16
 211#define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 212#define IN_CLASSB_MAX           65536
 213
 214#define IN_CLASSC(a)            ((((long int) (a)) & 0xe0000000) == 0xc0000000)
 215#define IN_CLASSC_NET           0xffffff00
 216#define IN_CLASSC_NSHIFT        8
 217#define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 218
 219#define IN_CLASSD(a)            ((((long int) (a)) & 0xf0000000) == 0xe0000000)
 220#define IN_MULTICAST(a)         IN_CLASSD(a)
 221#define IN_MULTICAST_NET        0xF0000000
 222
 223#define IN_EXPERIMENTAL(a)      ((((long int) (a)) & 0xf0000000) == 0xf0000000)
 224#define IN_BADCLASS(a)          IN_EXPERIMENTAL((a))
 225
 226/* Address to accept any incoming messages. */
 227#define INADDR_ANY              ((unsigned long int) 0x00000000)
 228
 229/* Address to send to all hosts. */
 230#define INADDR_BROADCAST        ((unsigned long int) 0xffffffff)
 231
 232/* Address indicating an error return. */
 233#define INADDR_NONE             ((unsigned long int) 0xffffffff)
 234
 235/* Network number for local host loopback. */
 236#define IN_LOOPBACKNET          127
 237
 238/* Address to loopback in software to local host.  */
 239#define INADDR_LOOPBACK         0x7f000001      /* 127.0.0.1   */
 240#define IN_LOOPBACK(a)          ((((long int) (a)) & 0xff000000) == 0x7f000000)
 241
 242/* Defines for Multicast INADDR */
 243#define INADDR_UNSPEC_GROUP     0xe0000000U     /* 224.0.0.0   */
 244#define INADDR_ALLHOSTS_GROUP   0xe0000001U     /* 224.0.0.1   */
 245#define INADDR_ALLRTRS_GROUP    0xe0000002U     /* 224.0.0.2 */
 246#define INADDR_MAX_LOCAL_GROUP  0xe00000ffU     /* 224.0.0.255 */
 247
 248
 249/* <asm/byteorder.h> contains the htonl type stuff.. */
 250#include <asm/byteorder.h> 
 251
 252#ifdef __KERNEL__
 253
 254#include <linux/errno.h>
 255
 256static inline int proto_ports_offset(int proto)
 257{
 258        switch (proto) {
 259        case IPPROTO_TCP:
 260        case IPPROTO_UDP:
 261        case IPPROTO_DCCP:
 262        case IPPROTO_ESP:       /* SPI */
 263        case IPPROTO_SCTP:
 264        case IPPROTO_UDPLITE:
 265                return 0;
 266        case IPPROTO_AH:        /* SPI */
 267                return 4;
 268        default:
 269                return -EINVAL;
 270        }
 271}
 272
 273static inline bool ipv4_is_loopback(__be32 addr)
 274{
 275        return (addr & htonl(0xff000000)) == htonl(0x7f000000);
 276}
 277
 278static inline bool ipv4_is_multicast(__be32 addr)
 279{
 280        return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
 281}
 282
 283static inline bool ipv4_is_local_multicast(__be32 addr)
 284{
 285        return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
 286}
 287
 288static inline bool ipv4_is_lbcast(__be32 addr)
 289{
 290        /* limited broadcast */
 291        return addr == htonl(INADDR_BROADCAST);
 292}
 293
 294static inline bool ipv4_is_zeronet(__be32 addr)
 295{
 296        return (addr & htonl(0xff000000)) == htonl(0x00000000);
 297}
 298
 299/* Special-Use IPv4 Addresses (RFC3330) */
 300
 301static inline bool ipv4_is_private_10(__be32 addr)
 302{
 303        return (addr & htonl(0xff000000)) == htonl(0x0a000000);
 304}
 305
 306static inline bool ipv4_is_private_172(__be32 addr)
 307{
 308        return (addr & htonl(0xfff00000)) == htonl(0xac100000);
 309}
 310
 311static inline bool ipv4_is_private_192(__be32 addr)
 312{
 313        return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
 314}
 315
 316static inline bool ipv4_is_linklocal_169(__be32 addr)
 317{
 318        return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
 319}
 320
 321static inline bool ipv4_is_anycast_6to4(__be32 addr)
 322{
 323        return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
 324}
 325
 326static inline bool ipv4_is_test_192(__be32 addr)
 327{
 328        return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
 329}
 330
 331static inline bool ipv4_is_test_198(__be32 addr)
 332{
 333        return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
 334}
 335#endif
 336
 337#endif  /* _LINUX_IN_H */
 338
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