inet/netinet/in.h

   1 /* Copyright (C) 1991-2013 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _NETINET_IN_H
  19 #define _NETINET_IN_H   1
  20
  21 #include <features.h>
  22 #include <stdint.h>
  23 #include <sys/socket.h>
  24 #include <bits/types.h>
  25
  26
  27 __BEGIN_DECLS
  28
  29 /* Standard well-defined IP protocols.  */
  30 enum
  31   {
  32     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  33 #define IPPROTO_IP              IPPROTO_IP
  34     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
  35 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
  36     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  37 #define IPPROTO_ICMP            IPPROTO_ICMP
  38     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  39 #define IPPROTO_IGMP            IPPROTO_IGMP
  40     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  41 #define IPPROTO_IPIP            IPPROTO_IPIP
  42     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  43 #define IPPROTO_TCP             IPPROTO_TCP
  44     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  45 #define IPPROTO_EGP             IPPROTO_EGP
  46     IPPROTO_PUP = 12,      /* PUP protocol.  */
  47 #define IPPROTO_PUP             IPPROTO_PUP
  48     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  49 #define IPPROTO_UDP             IPPROTO_UDP
  50     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  51 #define IPPROTO_IDP             IPPROTO_IDP
  52     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  53 #define IPPROTO_TP              IPPROTO_TP
  54     IPPROTO_DCCP = 33,     /* Datagram Congestion Control Protocol.  */
  55 #define IPPROTO_DCCP            IPPROTO_DCCP
  56     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  57 #define IPPROTO_IPV6            IPPROTO_IPV6
  58     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
  59 #define IPPROTO_ROUTING         IPPROTO_ROUTING
  60     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
  61 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
  62     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  63 #define IPPROTO_RSVP            IPPROTO_RSVP
  64     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  65 #define IPPROTO_GRE             IPPROTO_GRE
  66     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  67 #define IPPROTO_ESP             IPPROTO_ESP
  68     IPPROTO_AH = 51,       /* authentication header.  */
  69 #define IPPROTO_AH              IPPROTO_AH
  70     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
  71 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
  72     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
  73 #define IPPROTO_NONE            IPPROTO_NONE
  74     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
  75 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
  76     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  77 #define IPPROTO_MTP             IPPROTO_MTP
  78     IPPROTO_ENCAP = 98,    /* Encapsulation Header.  */
  79 #define IPPROTO_ENCAP           IPPROTO_ENCAP
  80     IPPROTO_PIM = 103,     /* Protocol Independent Multicast.  */
  81 #define IPPROTO_PIM             IPPROTO_PIM
  82     IPPROTO_COMP = 108,    /* Compression Header Protocol.  */
  83 #define IPPROTO_COMP            IPPROTO_COMP
  84     IPPROTO_SCTP = 132,    /* Stream Control Transmission Protocol.  */
  85 #define IPPROTO_SCTP            IPPROTO_SCTP
  86     IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
  87 #define IPPROTO_UDPLITE         IPPROTO_UDPLITE
  88     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  89 #define IPPROTO_RAW             IPPROTO_RAW
  90     IPPROTO_MAX
  91   };
  92
  93
  94 /* Type to represent a port.  */
  95 typedef uint16_t in_port_t;
  96
  97 /* Standard well-known ports.  */
  98 enum
  99   {
 100     IPPORT_ECHO = 7,            /* Echo service.  */
 101     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 102     IPPORT_SYSTAT = 11,         /* System status service.  */
 103     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 104     IPPORT_NETSTAT = 15,        /* Network status service.  */
 105     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 106     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 107     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 108     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 109     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 110     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 111     IPPORT_MTP = 57,
 112
 113     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 114     IPPORT_RJE = 77,
 115     IPPORT_FINGER = 79,         /* Finger service.  */
 116     IPPORT_TTYLINK = 87,
 117     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 118
 119
 120     IPPORT_EXECSERVER = 512,    /* execd service.  */
 121     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 122     IPPORT_CMDSERVER = 514,
 123     IPPORT_EFSSERVER = 520,
 124
 125     /* UDP ports.  */
 126     IPPORT_BIFFUDP = 512,
 127     IPPORT_WHOSERVER = 513,
 128     IPPORT_ROUTESERVER = 520,
 129
 130     /* Ports less than this value are reserved for privileged processes.  */
 131     IPPORT_RESERVED = 1024,
 132
 133     /* Ports greater this value are reserved for (non-privileged) servers.  */
 134     IPPORT_USERRESERVED = 5000
 135   };
 136
 137
 138 /* Internet address.  */
 139 typedef uint32_t in_addr_t;
 140 struct in_addr
 141   {
 142     in_addr_t s_addr;
 143   };
 144
 145
 146 /* Definitions of the bits in an Internet address integer.
 147
 148    On subnets, host and network parts are found according to
 149    the subnet mask, not these masks.  */
 150
 151 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 152 #define IN_CLASSA_NET           0xff000000
 153 #define IN_CLASSA_NSHIFT        24
 154 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 155 #define IN_CLASSA_MAX           128
 156
 157 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 158 #define IN_CLASSB_NET           0xffff0000
 159 #define IN_CLASSB_NSHIFT        16
 160 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 161 #define IN_CLASSB_MAX           65536
 162
 163 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 164 #define IN_CLASSC_NET           0xffffff00
 165 #define IN_CLASSC_NSHIFT        8
 166 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 167
 168 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 169 #define IN_MULTICAST(a)         IN_CLASSD(a)
 170
 171 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 172 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 173
 174 /* Address to accept any incoming messages.  */
 175 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 176 /* Address to send to all hosts.  */
 177 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 178 /* Address indicating an error return.  */
 179 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 180
 181 /* Network number for local host loopback.  */
 182 #define IN_LOOPBACKNET          127
 183 /* Address to loopback in software to local host.  */
 184 #ifndef INADDR_LOOPBACK
 185 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 186 #endif
 187
 188 /* Defines for Multicast INADDR.  */
 189 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 190 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 191 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 192 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 193
 194
 195 /* IPv6 address */
 196 struct in6_addr
 197   {
 198     union
 199       {
 200         uint8_t __u6_addr8[16];
 201 #if defined __USE_MISC || defined __USE_GNU
 202         uint16_t __u6_addr16[8];
 203         uint32_t __u6_addr32[4];
 204 #endif
 205       } __in6_u;
 206 #define s6_addr                 __in6_u.__u6_addr8
 207 #if defined __USE_MISC || defined __USE_GNU
 208 # define s6_addr16              __in6_u.__u6_addr16
 209 # define s6_addr32              __in6_u.__u6_addr32
 210 #endif
 211   };
 212
 213 extern const struct in6_addr in6addr_any;        /* :: */
 214 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 215 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 216 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 217
 218 #define INET_ADDRSTRLEN 16
 219 #define INET6_ADDRSTRLEN 46
 220
 221
 222 /* Structure describing an Internet socket address.  */
 223 struct sockaddr_in
 224   {
 225     __SOCKADDR_COMMON (sin_);
 226     in_port_t sin_port;                 /* Port number.  */
 227     struct in_addr sin_addr;            /* Internet address.  */
 228
 229     /* Pad to size of `struct sockaddr'.  */
 230     unsigned char sin_zero[sizeof (struct sockaddr) -
 231                            __SOCKADDR_COMMON_SIZE -
 232                            sizeof (in_port_t) -
 233                            sizeof (struct in_addr)];
 234   };
 235
 236 /* Ditto, for IPv6.  */
 237 struct sockaddr_in6
 238   {
 239     __SOCKADDR_COMMON (sin6_);
 240     in_port_t sin6_port;        /* Transport layer port # */
 241     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 242     struct in6_addr sin6_addr;  /* IPv6 address */
 243     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 244   };
 245
 246
 247 #if defined __USE_MISC || defined __USE_GNU
 248 /* IPv4 multicast request.  */
 249 struct ip_mreq
 250   {
 251     /* IP multicast address of group.  */
 252     struct in_addr imr_multiaddr;
 253
 254     /* Local IP address of interface.  */
 255     struct in_addr imr_interface;
 256   };
 257
 258 struct ip_mreq_source
 259   {
 260     /* IP multicast address of group.  */
 261     struct in_addr imr_multiaddr;
 262
 263     /* IP address of source.  */
 264     struct in_addr imr_interface;
 265
 266     /* IP address of interface.  */
 267     struct in_addr imr_sourceaddr;
 268   };
 269 #endif
 270
 271
 272 /* Likewise, for IPv6.  */
 273 struct ipv6_mreq
 274   {
 275     /* IPv6 multicast address of group */
 276     struct in6_addr ipv6mr_multiaddr;
 277
 278     /* local interface */
 279     unsigned int ipv6mr_interface;
 280   };
 281
 282
 283 #if defined __USE_MISC || defined __USE_GNU
 284 /* Multicast group request.  */
 285 struct group_req
 286   {
 287     /* Interface index.  */
 288     uint32_t gr_interface;
 289
 290     /* Group address.  */
 291     struct sockaddr_storage gr_group;
 292   };
 293
 294 struct group_source_req
 295   {
 296     /* Interface index.  */
 297     uint32_t gsr_interface;
 298
 299     /* Group address.  */
 300     struct sockaddr_storage gsr_group;
 301
 302     /* Source address.  */
 303     struct sockaddr_storage gsr_source;
 304   };
 305
 306
 307 /* Full-state filter operations.  */
 308 struct ip_msfilter
 309   {
 310     /* IP multicast address of group.  */
 311     struct in_addr imsf_multiaddr;
 312
 313     /* Local IP address of interface.  */
 314     struct in_addr imsf_interface;
 315
 316     /* Filter mode.  */
 317     uint32_t imsf_fmode;
 318
 319     /* Number of source addresses.  */
 320     uint32_t imsf_numsrc;
 321     /* Source addresses.  */
 322     struct in_addr imsf_slist[1];
 323   };
 324
 325 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 326                                   - sizeof (struct in_addr)                   \
 327                                   + (numsrc) * sizeof (struct in_addr))
 328
 329 struct group_filter
 330   {
 331     /* Interface index.  */
 332     uint32_t gf_interface;
 333
 334     /* Group address.  */
 335     struct sockaddr_storage gf_group;
 336
 337     /* Filter mode.  */
 338     uint32_t gf_fmode;
 339
 340     /* Number of source addresses.  */
 341     uint32_t gf_numsrc;
 342     /* Source addresses.  */
 343     struct sockaddr_storage gf_slist[1];
 344 };
 345
 346 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 347                                    - sizeof (struct sockaddr_storage)         \
 348                                    + ((numsrc)                                \
 349                                       * sizeof (struct sockaddr_storage)))
 350 #endif
 351
 352
 353 /* Get system-specific definitions.  */
 354 #include <bits/in.h>
 355
 356 /* Functions to convert between host and network byte order.
 357
 358    Please note that these functions normally take `unsigned long int' or
 359    `unsigned short int' values as arguments and also return them.  But
 360    this was a short-sighted decision since on different systems the types
 361    may have different representations but the values are always the same.  */
 362
 363 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 364 extern uint16_t ntohs (uint16_t __netshort)
 365      __THROW __attribute__ ((__const__));
 366 extern uint32_t htonl (uint32_t __hostlong)
 367      __THROW __attribute__ ((__const__));
 368 extern uint16_t htons (uint16_t __hostshort)
 369      __THROW __attribute__ ((__const__));
 370
 371 #include <endian.h>
 372
 373 /* Get machine dependent optimized versions of byte swapping functions.  */
 374 #include <bits/byteswap.h>
 375
 376 #ifdef __OPTIMIZE__
 377 /* We can optimize calls to the conversion functions.  Either nothing has
 378    to be done or we are using directly the byte-swapping functions which
 379    often can be inlined.  */
 380 # if __BYTE_ORDER == __BIG_ENDIAN
 381 /* The host byte order is the same as network byte order,
 382    so these functions are all just identity.  */
 383 # define ntohl(x)       (x)
 384 # define ntohs(x)       (x)
 385 # define htonl(x)       (x)
 386 # define htons(x)       (x)
 387 # else
 388 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 389 #   define ntohl(x)     __bswap_32 (x)
 390 #   define ntohs(x)     __bswap_16 (x)
 391 #   define htonl(x)     __bswap_32 (x)
 392 #   define htons(x)     __bswap_16 (x)
 393 #  endif
 394 # endif
 395 #endif
 396
 397 #ifdef __GNUC__
 398 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 399   (__extension__                                                              \
 400    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 401       __a->s6_addr32[0] == 0                                                  \
 402       && __a->s6_addr32[1] == 0                                               \
 403       && __a->s6_addr32[2] == 0                                               \
 404       && __a->s6_addr32[3] == 0; }))
 405
 406 # define IN6_IS_ADDR_LOOPBACK(a) \
 407   (__extension__                                                              \
 408    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 409       __a->s6_addr32[0] == 0                                                  \
 410       && __a->s6_addr32[1] == 0                                               \
 411       && __a->s6_addr32[2] == 0                                               \
 412       && __a->s6_addr32[3] == htonl (1); }))
 413
 414 # define IN6_IS_ADDR_LINKLOCAL(a) \
 415   (__extension__                                                              \
 416    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 417       (__a->s6_addr32[0] & htonl (0xffc00000)) == htonl (0xfe800000); }))
 418
 419 # define IN6_IS_ADDR_SITELOCAL(a) \
 420   (__extension__                                                              \
 421    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 422       (__a->s6_addr32[0] & htonl (0xffc00000)) == htonl (0xfec00000); }))
 423
 424 # define IN6_IS_ADDR_V4MAPPED(a) \
 425   (__extension__                                                              \
 426    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 427       __a->s6_addr32[0] == 0                                                  \
 428       && __a->s6_addr32[1] == 0                                               \
 429       && __a->s6_addr32[2] == htonl (0xffff); }))
 430
 431 # define IN6_IS_ADDR_V4COMPAT(a) \
 432   (__extension__                                                              \
 433    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 434       __a->s6_addr32[0] == 0                                                  \
 435       && __a->s6_addr32[1] == 0                                               \
 436       && __a->s6_addr32[2] == 0                                               \
 437       && ntohl (__a->s6_addr32[3]) > 1; }))
 438
 439 # define IN6_ARE_ADDR_EQUAL(a,b) \
 440   (__extension__                                                              \
 441    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 442       const struct in6_addr *__b = (const struct in6_addr *) (b);             \
 443       __a->s6_addr32[0] == __b->s6_addr32[0]                                  \
 444       && __a->s6_addr32[1] == __b->s6_addr32[1]                               \
 445       && __a->s6_addr32[2] == __b->s6_addr32[2]                               \
 446       && __a->s6_addr32[3] == __b->s6_addr32[3]; }))
 447 #else
 448 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 449         (((const uint32_t *) (a))[0] == 0                                     \
 450          && ((const uint32_t *) (a))[1] == 0                                  \
 451          && ((const uint32_t *) (a))[2] == 0                                  \
 452          && ((const uint32_t *) (a))[3] == 0)
 453
 454 # define IN6_IS_ADDR_LOOPBACK(a) \
 455         (((const uint32_t *) (a))[0] == 0                                     \
 456          && ((const uint32_t *) (a))[1] == 0                                  \
 457          && ((const uint32_t *) (a))[2] == 0                                  \
 458          && ((const uint32_t *) (a))[3] == htonl (1))
 459
 460 # define IN6_IS_ADDR_LINKLOCAL(a) \
 461         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 462          == htonl (0xfe800000))
 463
 464 # define IN6_IS_ADDR_SITELOCAL(a) \
 465         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 466          == htonl (0xfec00000))
 467
 468 # define IN6_IS_ADDR_V4MAPPED(a) \
 469         ((((const uint32_t *) (a))[0] == 0)                                   \
 470          && (((const uint32_t *) (a))[1] == 0)                                \
 471          && (((const uint32_t *) (a))[2] == htonl (0xffff)))
 472
 473 # define IN6_IS_ADDR_V4COMPAT(a) \
 474         ((((const uint32_t *) (a))[0] == 0)                                   \
 475          && (((const uint32_t *) (a))[1] == 0)                                \
 476          && (((const uint32_t *) (a))[2] == 0)                                \
 477          && (ntohl (((const uint32_t *) (a))[3]) > 1))
 478
 479 # define IN6_ARE_ADDR_EQUAL(a,b) \
 480         ((((const uint32_t *) (a))[0] == ((const uint32_t *) (b))[0])         \
 481          && (((const uint32_t *) (a))[1] == ((const uint32_t *) (b))[1])      \
 482          && (((const uint32_t *) (a))[2] == ((const uint32_t *) (b))[2])      \
 483          && (((const uint32_t *) (a))[3] == ((const uint32_t *) (b))[3]))
 484 #endif
 485
 486 #define IN6_IS_ADDR_MULTICAST(a) (((const uint8_t *) (a))[0] == 0xff)
 487
 488 #if defined __USE_MISC || defined __USE_GNU
 489 /* Bind socket to a privileged IP port.  */
 490 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 491
 492 /* The IPv6 version of this function.  */
 493 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 494      __THROW;
 495 #endif
 496
 497
 498 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 499         (IN6_IS_ADDR_MULTICAST(a)                                             \
 500          && ((((const uint8_t *) (a))[1] & 0xf) == 0x1))
 501
 502 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 503         (IN6_IS_ADDR_MULTICAST(a)                                             \
 504          && ((((const uint8_t *) (a))[1] & 0xf) == 0x2))
 505
 506 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 507         (IN6_IS_ADDR_MULTICAST(a)                                             \
 508          && ((((const uint8_t *) (a))[1] & 0xf) == 0x5))
 509
 510 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 511         (IN6_IS_ADDR_MULTICAST(a)                                             \
 512          && ((((const uint8_t *) (a))[1] & 0xf) == 0x8))
 513
 514 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 515         (IN6_IS_ADDR_MULTICAST(a)                                             \
 516          && ((((const uint8_t *) (a))[1] & 0xf) == 0xe))
 517
 518
 519 #ifdef __USE_GNU
 520 struct cmsghdr;                 /* Forward declaration.  */
 521
 522 /* IPv6 packet information.  */
 523 struct in6_pktinfo
 524   {
 525     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 526     unsigned int ipi6_ifindex;  /* send/recv interface index */
 527   };
 528
 529 /* IPv6 MTU information.  */
 530 struct ip6_mtuinfo
 531   {
 532     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 533     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 534   };
 535
 536
 537 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 538 extern int inet6_option_space (int __nbytes)
 539      __THROW __attribute_deprecated__;
 540 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 541                               int __type) __THROW __attribute_deprecated__;
 542 extern int inet6_option_append (struct cmsghdr *__cmsg,
 543                                 const uint8_t *__typep, int __multx,
 544                                 int __plusy) __THROW __attribute_deprecated__;
 545 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 546                                     int __multx, int __plusy)
 547      __THROW __attribute_deprecated__;
 548 extern int inet6_option_next (const struct cmsghdr *__cmsg,
 549                               uint8_t **__tptrp)
 550      __THROW __attribute_deprecated__;
 551 extern int inet6_option_find (const struct cmsghdr *__cmsg,
 552                               uint8_t **__tptrp, int __type)
 553      __THROW __attribute_deprecated__;
 554
 555
 556 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 557 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 558 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 559                              uint8_t __type, socklen_t __len, uint8_t __align,
 560                              void **__databufp) __THROW;
 561 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 562      __THROW;
 563 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 564                               socklen_t __vallen) __THROW;
 565 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 566                            uint8_t *__typep, socklen_t *__lenp,
 567                            void **__databufp) __THROW;
 568 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 569                            uint8_t __type, socklen_t *__lenp,
 570                            void **__databufp) __THROW;
 571 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 572                               socklen_t __vallen) __THROW;
 573
 574
 575 /* Routing Header Option (RFC 3542).  */
 576 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 577 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 578                              int __segments) __THROW;
 579 extern int inet6_rth_add (void *__bp, const struct in6_addr *__addr) __THROW;
 580 extern int inet6_rth_reverse (const void *__in, void *__out) __THROW;
 581 extern int inet6_rth_segments (const void *__bp) __THROW;
 582 extern struct in6_addr *inet6_rth_getaddr (const void *__bp, int __index)
 583      __THROW;
 584
 585
 586 /* Multicast source filter support.  */
 587
 588 /* Get IPv4 source filter.  */
 589 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 590                                 struct in_addr __group, uint32_t *__fmode,
 591                                 uint32_t *__numsrc, struct in_addr *__slist)
 592      __THROW;
 593
 594 /* Set IPv4 source filter.  */
 595 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 596                                 struct in_addr __group, uint32_t __fmode,
 597                                 uint32_t __numsrc,
 598                                 const struct in_addr *__slist)
 599      __THROW;
 600
 601
 602 /* Get source filter.  */
 603 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 604                             const struct sockaddr *__group,
 605                             socklen_t __grouplen, uint32_t *__fmode,
 606                             uint32_t *__numsrc,
 607                             struct sockaddr_storage *__slist) __THROW;
 608
 609 /* Set source filter.  */
 610 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 611                             const struct sockaddr *__group,
 612                             socklen_t __grouplen, uint32_t __fmode,
 613                             uint32_t __numsrc,
 614                             const struct sockaddr_storage *__slist) __THROW;
 615 #endif  /* use GNU */
 616
 617 __END_DECLS
 618
 619 #endif  /* netinet/in.h */