inet/netinet/in.h

   1 /* Copyright (C) 1991-2001, 2003, 2004, 2006, 2007, 2008, 2011, 2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _NETINET_IN_H
  20 #define _NETINET_IN_H   1
  21
  22 #include <features.h>
  23 #include <stdint.h>
  24 #include <sys/socket.h>
  25 #include <bits/types.h>
  26
  27
  28 __BEGIN_DECLS
  29
  30 /* Standard well-defined IP protocols.  */
  31 enum
  32   {
  33     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  34 #define IPPROTO_IP              IPPROTO_IP
  35     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
  36 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
  37     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  38 #define IPPROTO_ICMP            IPPROTO_ICMP
  39     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  40 #define IPPROTO_IGMP            IPPROTO_IGMP
  41     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  42 #define IPPROTO_IPIP            IPPROTO_IPIP
  43     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  44 #define IPPROTO_TCP             IPPROTO_TCP
  45     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  46 #define IPPROTO_EGP             IPPROTO_EGP
  47     IPPROTO_PUP = 12,      /* PUP protocol.  */
  48 #define IPPROTO_PUP             IPPROTO_PUP
  49     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  50 #define IPPROTO_UDP             IPPROTO_UDP
  51     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  52 #define IPPROTO_IDP             IPPROTO_IDP
  53     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  54 #define IPPROTO_TP              IPPROTO_TP
  55     IPPROTO_DCCP = 33,     /* Datagram Congestion Control Protocol.  */
  56 #define IPPROTO_DCCP            IPPROTO_DCCP
  57     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  58 #define IPPROTO_IPV6            IPPROTO_IPV6
  59     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
  60 #define IPPROTO_ROUTING         IPPROTO_ROUTING
  61     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
  62 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
  63     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  64 #define IPPROTO_RSVP            IPPROTO_RSVP
  65     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  66 #define IPPROTO_GRE             IPPROTO_GRE
  67     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  68 #define IPPROTO_ESP             IPPROTO_ESP
  69     IPPROTO_AH = 51,       /* authentication header.  */
  70 #define IPPROTO_AH              IPPROTO_AH
  71     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
  72 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
  73     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
  74 #define IPPROTO_NONE            IPPROTO_NONE
  75     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
  76 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
  77     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  78 #define IPPROTO_MTP             IPPROTO_MTP
  79     IPPROTO_ENCAP = 98,    /* Encapsulation Header.  */
  80 #define IPPROTO_ENCAP           IPPROTO_ENCAP
  81     IPPROTO_PIM = 103,     /* Protocol Independent Multicast.  */
  82 #define IPPROTO_PIM             IPPROTO_PIM
  83     IPPROTO_COMP = 108,    /* Compression Header Protocol.  */
  84 #define IPPROTO_COMP            IPPROTO_COMP
  85     IPPROTO_SCTP = 132,    /* Stream Control Transmission Protocol.  */
  86 #define IPPROTO_SCTP            IPPROTO_SCTP
  87     IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
  88 #define IPPROTO_UDPLITE         IPPROTO_UDPLITE
  89     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  90 #define IPPROTO_RAW             IPPROTO_RAW
  91     IPPROTO_MAX
  92   };
  93
  94
  95 /* Type to represent a port.  */
  96 typedef uint16_t in_port_t;
  97
  98 /* Standard well-known ports.  */
  99 enum
 100   {
 101     IPPORT_ECHO = 7,            /* Echo service.  */
 102     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 103     IPPORT_SYSTAT = 11,         /* System status service.  */
 104     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 105     IPPORT_NETSTAT = 15,        /* Network status service.  */
 106     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 107     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 108     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 109     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 110     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 111     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 112     IPPORT_MTP = 57,
 113
 114     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 115     IPPORT_RJE = 77,
 116     IPPORT_FINGER = 79,         /* Finger service.  */
 117     IPPORT_TTYLINK = 87,
 118     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 119
 120
 121     IPPORT_EXECSERVER = 512,    /* execd service.  */
 122     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 123     IPPORT_CMDSERVER = 514,
 124     IPPORT_EFSSERVER = 520,
 125
 126     /* UDP ports.  */
 127     IPPORT_BIFFUDP = 512,
 128     IPPORT_WHOSERVER = 513,
 129     IPPORT_ROUTESERVER = 520,
 130
 131     /* Ports less than this value are reserved for privileged processes.  */
 132     IPPORT_RESERVED = 1024,
 133
 134     /* Ports greater this value are reserved for (non-privileged) servers.  */
 135     IPPORT_USERRESERVED = 5000
 136   };
 137
 138
 139 /* Internet address.  */
 140 typedef uint32_t in_addr_t;
 141 struct in_addr
 142   {
 143     in_addr_t s_addr;
 144   };
 145
 146
 147 /* Definitions of the bits in an Internet address integer.
 148
 149    On subnets, host and network parts are found according to
 150    the subnet mask, not these masks.  */
 151
 152 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 153 #define IN_CLASSA_NET           0xff000000
 154 #define IN_CLASSA_NSHIFT        24
 155 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 156 #define IN_CLASSA_MAX           128
 157
 158 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 159 #define IN_CLASSB_NET           0xffff0000
 160 #define IN_CLASSB_NSHIFT        16
 161 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 162 #define IN_CLASSB_MAX           65536
 163
 164 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 165 #define IN_CLASSC_NET           0xffffff00
 166 #define IN_CLASSC_NSHIFT        8
 167 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 168
 169 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 170 #define IN_MULTICAST(a)         IN_CLASSD(a)
 171
 172 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 173 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 174
 175 /* Address to accept any incoming messages.  */
 176 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 177 /* Address to send to all hosts.  */
 178 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 179 /* Address indicating an error return.  */
 180 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 181
 182 /* Network number for local host loopback.  */
 183 #define IN_LOOPBACKNET          127
 184 /* Address to loopback in software to local host.  */
 185 #ifndef INADDR_LOOPBACK
 186 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 187 #endif
 188
 189 /* Defines for Multicast INADDR.  */
 190 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 191 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 192 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 193 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 194
 195
 196 /* IPv6 address */
 197 struct in6_addr
 198   {
 199     union
 200       {
 201         uint8_t __u6_addr8[16];
 202 #if defined __USE_MISC || defined __USE_GNU
 203         uint16_t __u6_addr16[8];
 204         uint32_t __u6_addr32[4];
 205 #endif
 206       } __in6_u;
 207 #define s6_addr                 __in6_u.__u6_addr8
 208 #if defined __USE_MISC || defined __USE_GNU
 209 # define s6_addr16              __in6_u.__u6_addr16
 210 # define s6_addr32              __in6_u.__u6_addr32
 211 #endif
 212   };
 213
 214 extern const struct in6_addr in6addr_any;        /* :: */
 215 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 216 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 217 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 218
 219 #define INET_ADDRSTRLEN 16
 220 #define INET6_ADDRSTRLEN 46
 221
 222
 223 /* Structure describing an Internet socket address.  */
 224 struct sockaddr_in
 225   {
 226     __SOCKADDR_COMMON (sin_);
 227     in_port_t sin_port;                 /* Port number.  */
 228     struct in_addr sin_addr;            /* Internet address.  */
 229
 230     /* Pad to size of `struct sockaddr'.  */
 231     unsigned char sin_zero[sizeof (struct sockaddr) -
 232                            __SOCKADDR_COMMON_SIZE -
 233                            sizeof (in_port_t) -
 234                            sizeof (struct in_addr)];
 235   };
 236
 237 /* Ditto, for IPv6.  */
 238 struct sockaddr_in6
 239   {
 240     __SOCKADDR_COMMON (sin6_);
 241     in_port_t sin6_port;        /* Transport layer port # */
 242     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 243     struct in6_addr sin6_addr;  /* IPv6 address */
 244     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 245   };
 246
 247
 248 #if defined __USE_MISC || defined __USE_GNU
 249 /* IPv4 multicast request.  */
 250 struct ip_mreq
 251   {
 252     /* IP multicast address of group.  */
 253     struct in_addr imr_multiaddr;
 254
 255     /* Local IP address of interface.  */
 256     struct in_addr imr_interface;
 257   };
 258
 259 struct ip_mreq_source
 260   {
 261     /* IP multicast address of group.  */
 262     struct in_addr imr_multiaddr;
 263
 264     /* IP address of source.  */
 265     struct in_addr imr_interface;
 266
 267     /* IP address of interface.  */
 268     struct in_addr imr_sourceaddr;
 269   };
 270 #endif
 271
 272
 273 /* Likewise, for IPv6.  */
 274 struct ipv6_mreq
 275   {
 276     /* IPv6 multicast address of group */
 277     struct in6_addr ipv6mr_multiaddr;
 278
 279     /* local interface */
 280     unsigned int ipv6mr_interface;
 281   };
 282
 283
 284 #if defined __USE_MISC || defined __USE_GNU
 285 /* Multicast group request.  */
 286 struct group_req
 287   {
 288     /* Interface index.  */
 289     uint32_t gr_interface;
 290
 291     /* Group address.  */
 292     struct sockaddr_storage gr_group;
 293   };
 294
 295 struct group_source_req
 296   {
 297     /* Interface index.  */
 298     uint32_t gsr_interface;
 299
 300     /* Group address.  */
 301     struct sockaddr_storage gsr_group;
 302
 303     /* Source address.  */
 304     struct sockaddr_storage gsr_source;
 305   };
 306
 307
 308 /* Full-state filter operations.  */
 309 struct ip_msfilter
 310   {
 311     /* IP multicast address of group.  */
 312     struct in_addr imsf_multiaddr;
 313
 314     /* Local IP address of interface.  */
 315     struct in_addr imsf_interface;
 316
 317     /* Filter mode.  */
 318     uint32_t imsf_fmode;
 319
 320     /* Number of source addresses.  */
 321     uint32_t imsf_numsrc;
 322     /* Source addresses.  */
 323     struct in_addr imsf_slist[1];
 324   };
 325
 326 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 327                                   - sizeof (struct in_addr)                   \
 328                                   + (numsrc) * sizeof (struct in_addr))
 329
 330 struct group_filter
 331   {
 332     /* Interface index.  */
 333     uint32_t gf_interface;
 334
 335     /* Group address.  */
 336     struct sockaddr_storage gf_group;
 337
 338     /* Filter mode.  */
 339     uint32_t gf_fmode;
 340
 341     /* Number of source addresses.  */
 342     uint32_t gf_numsrc;
 343     /* Source addresses.  */
 344     struct sockaddr_storage gf_slist[1];
 345 };
 346
 347 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 348                                    - sizeof (struct sockaddr_storage)         \
 349                                    + ((numsrc)                                \
 350                                       * sizeof (struct sockaddr_storage)))
 351 #endif
 352
 353
 354 /* Get system-specific definitions.  */
 355 #include <bits/in.h>
 356
 357 /* Functions to convert between host and network byte order.
 358
 359    Please note that these functions normally take `unsigned long int' or
 360    `unsigned short int' values as arguments and also return them.  But
 361    this was a short-sighted decision since on different systems the types
 362    may have different representations but the values are always the same.  */
 363
 364 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 365 extern uint16_t ntohs (uint16_t __netshort)
 366      __THROW __attribute__ ((__const__));
 367 extern uint32_t htonl (uint32_t __hostlong)
 368      __THROW __attribute__ ((__const__));
 369 extern uint16_t htons (uint16_t __hostshort)
 370      __THROW __attribute__ ((__const__));
 371
 372 #include <endian.h>
 373
 374 /* Get machine dependent optimized versions of byte swapping functions.  */
 375 #include <bits/byteswap.h>
 376
 377 #ifdef __OPTIMIZE__
 378 /* We can optimize calls to the conversion functions.  Either nothing has
 379    to be done or we are using directly the byte-swapping functions which
 380    often can be inlined.  */
 381 # if __BYTE_ORDER == __BIG_ENDIAN
 382 /* The host byte order is the same as network byte order,
 383    so these functions are all just identity.  */
 384 # define ntohl(x)       (x)
 385 # define ntohs(x)       (x)
 386 # define htonl(x)       (x)
 387 # define htons(x)       (x)
 388 # else
 389 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 390 #   define ntohl(x)     __bswap_32 (x)
 391 #   define ntohs(x)     __bswap_16 (x)
 392 #   define htonl(x)     __bswap_32 (x)
 393 #   define htons(x)     __bswap_16 (x)
 394 #  endif
 395 # endif
 396 #endif
 397
 398 #ifdef __GNUC__
 399 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 400   (__extension__                                                              \
 401    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 402       __a->s6_addr32[0] == 0                                                  \
 403       && __a->s6_addr32[1] == 0                                               \
 404       && __a->s6_addr32[2] == 0                                               \
 405       && __a->s6_addr32[3] == 0; }))
 406
 407 # define IN6_IS_ADDR_LOOPBACK(a) \
 408   (__extension__                                                              \
 409    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 410       __a->s6_addr32[0] == 0                                                  \
 411       && __a->s6_addr32[1] == 0                                               \
 412       && __a->s6_addr32[2] == 0                                               \
 413       && __a->s6_addr32[3] == htonl (1); }))
 414
 415 # define IN6_IS_ADDR_LINKLOCAL(a) \
 416   (__extension__                                                              \
 417    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 418       (__a->s6_addr32[0] & htonl (0xffc00000)) == htonl (0xfe800000); }))
 419
 420 # define IN6_IS_ADDR_SITELOCAL(a) \
 421   (__extension__                                                              \
 422    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 423       (__a->s6_addr32[0] & htonl (0xffc00000)) == htonl (0xfec00000); }))
 424
 425 # define IN6_IS_ADDR_V4MAPPED(a) \
 426   (__extension__                                                              \
 427    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 428       __a->s6_addr32[0] == 0                                                  \
 429       && __a->s6_addr32[1] == 0                                               \
 430       && __a->s6_addr32[2] == htonl (0xffff); }))
 431
 432 # define IN6_IS_ADDR_V4COMPAT(a) \
 433   (__extension__                                                              \
 434    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 435       __a->s6_addr32[0] == 0                                                  \
 436       && __a->s6_addr32[1] == 0                                               \
 437       && __a->s6_addr32[2] == 0                                               \
 438       && ntohl (__a->s6_addr32[3]) > 1; }))
 439
 440 # define IN6_ARE_ADDR_EQUAL(a,b) \
 441   (__extension__                                                              \
 442    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 443       const struct in6_addr *__b = (const struct in6_addr *) (b);             \
 444       __a->s6_addr32[0] == __b->s6_addr32[0]                                  \
 445       && __a->s6_addr32[1] == __b->s6_addr32[1]                               \
 446       && __a->s6_addr32[2] == __b->s6_addr32[2]                               \
 447       && __a->s6_addr32[3] == __b->s6_addr32[3]; }))
 448 #else
 449 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 450         (((const uint32_t *) (a))[0] == 0                                     \
 451          && ((const uint32_t *) (a))[1] == 0                                  \
 452          && ((const uint32_t *) (a))[2] == 0                                  \
 453          && ((const uint32_t *) (a))[3] == 0)
 454
 455 # define IN6_IS_ADDR_LOOPBACK(a) \
 456         (((const uint32_t *) (a))[0] == 0                                     \
 457          && ((const uint32_t *) (a))[1] == 0                                  \
 458          && ((const uint32_t *) (a))[2] == 0                                  \
 459          && ((const uint32_t *) (a))[3] == htonl (1))
 460
 461 # define IN6_IS_ADDR_LINKLOCAL(a) \
 462         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 463          == htonl (0xfe800000))
 464
 465 # define IN6_IS_ADDR_SITELOCAL(a) \
 466         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 467          == htonl (0xfec00000))
 468
 469 # define IN6_IS_ADDR_V4MAPPED(a) \
 470         ((((const uint32_t *) (a))[0] == 0)                                   \
 471          && (((const uint32_t *) (a))[1] == 0)                                \
 472          && (((const uint32_t *) (a))[2] == htonl (0xffff)))
 473
 474 # define IN6_IS_ADDR_V4COMPAT(a) \
 475         ((((const uint32_t *) (a))[0] == 0)                                   \
 476          && (((const uint32_t *) (a))[1] == 0)                                \
 477          && (((const uint32_t *) (a))[2] == 0)                                \
 478          && (ntohl (((const uint32_t *) (a))[3]) > 1))
 479
 480 # define IN6_ARE_ADDR_EQUAL(a,b) \
 481         ((((const uint32_t *) (a))[0] == ((const uint32_t *) (b))[0])         \
 482          && (((const uint32_t *) (a))[1] == ((const uint32_t *) (b))[1])      \
 483          && (((const uint32_t *) (a))[2] == ((const uint32_t *) (b))[2])      \
 484          && (((const uint32_t *) (a))[3] == ((const uint32_t *) (b))[3]))
 485 #endif
 486
 487 #define IN6_IS_ADDR_MULTICAST(a) (((const uint8_t *) (a))[0] == 0xff)
 488
 489 #if defined __USE_MISC || defined __USE_GNU
 490 /* Bind socket to a privileged IP port.  */
 491 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 492
 493 /* The IPv6 version of this function.  */
 494 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 495      __THROW;
 496 #endif
 497
 498
 499 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 500         (IN6_IS_ADDR_MULTICAST(a)                                             \
 501          && ((((const uint8_t *) (a))[1] & 0xf) == 0x1))
 502
 503 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 504         (IN6_IS_ADDR_MULTICAST(a)                                             \
 505          && ((((const uint8_t *) (a))[1] & 0xf) == 0x2))
 506
 507 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 508         (IN6_IS_ADDR_MULTICAST(a)                                             \
 509          && ((((const uint8_t *) (a))[1] & 0xf) == 0x5))
 510
 511 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 512         (IN6_IS_ADDR_MULTICAST(a)                                             \
 513          && ((((const uint8_t *) (a))[1] & 0xf) == 0x8))
 514
 515 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 516         (IN6_IS_ADDR_MULTICAST(a)                                             \
 517          && ((((const uint8_t *) (a))[1] & 0xf) == 0xe))
 518
 519
 520 #ifdef __USE_GNU
 521 /* IPv6 packet information.  */
 522 struct in6_pktinfo
 523   {
 524     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 525     unsigned int ipi6_ifindex;  /* send/recv interface index */
 526   };
 527
 528 /* IPv6 MTU information.  */
 529 struct ip6_mtuinfo
 530   {
 531     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 532     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 533   };
 534
 535
 536 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 537 extern int inet6_option_space (int __nbytes)
 538      __THROW __attribute_deprecated__;
 539 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 540                               int __type) __THROW __attribute_deprecated__;
 541 extern int inet6_option_append (struct cmsghdr *__cmsg,
 542                                 const uint8_t *__typep, int __multx,
 543                                 int __plusy) __THROW __attribute_deprecated__;
 544 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 545                                     int __multx, int __plusy)
 546      __THROW __attribute_deprecated__;
 547 extern int inet6_option_next (const struct cmsghdr *__cmsg,
 548                               uint8_t **__tptrp)
 549      __THROW __attribute_deprecated__;
 550 extern int inet6_option_find (const struct cmsghdr *__cmsg,
 551                               uint8_t **__tptrp, int __type)
 552      __THROW __attribute_deprecated__;
 553
 554
 555 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 556 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 557 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 558                              uint8_t __type, socklen_t __len, uint8_t __align,
 559                              void **__databufp) __THROW;
 560 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 561      __THROW;
 562 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 563                               socklen_t __vallen) __THROW;
 564 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 565                            uint8_t *__typep, socklen_t *__lenp,
 566                            void **__databufp) __THROW;
 567 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 568                            uint8_t __type, socklen_t *__lenp,
 569                            void **__databufp) __THROW;
 570 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 571                               socklen_t __vallen) __THROW;
 572
 573
 574 /* Routing Header Option (RFC 3542).  */
 575 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 576 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 577                              int __segments) __THROW;
 578 extern int inet6_rth_add (void *__bp, const struct in6_addr *__addr) __THROW;
 579 extern int inet6_rth_reverse (const void *__in, void *__out) __THROW;
 580 extern int inet6_rth_segments (const void *__bp) __THROW;
 581 extern struct in6_addr *inet6_rth_getaddr (const void *__bp, int __index)
 582      __THROW;
 583
 584
 585 /* Multicast source filter support.  */
 586
 587 /* Get IPv4 source filter.  */
 588 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 589                                 struct in_addr __group, uint32_t *__fmode,
 590                                 uint32_t *__numsrc, struct in_addr *__slist)
 591      __THROW;
 592
 593 /* Set IPv4 source filter.  */
 594 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 595                                 struct in_addr __group, uint32_t __fmode,
 596                                 uint32_t __numsrc,
 597                                 const struct in_addr *__slist)
 598      __THROW;
 599
 600
 601 /* Get source filter.  */
 602 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 603                             const struct sockaddr *__group,
 604                             socklen_t __grouplen, uint32_t *__fmode,
 605                             uint32_t *__numsrc,
 606                             struct sockaddr_storage *__slist) __THROW;
 607
 608 /* Set source filter.  */
 609 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 610                             const struct sockaddr *__group,
 611                             socklen_t __grouplen, uint32_t __fmode,
 612                             uint32_t __numsrc,
 613                             const struct sockaddr_storage *__slist) __THROW;
 614 #endif  /* use GNU */
 615
 616 __END_DECLS
 617
 618 #endif  /* netinet/in.h */