inet/netinet/in.h

   1 /* Copyright (C) 1991-2022 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    <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _NETINET_IN_H
  19 #define _NETINET_IN_H   1
  20
  21 #include <features.h>
  22 #include <bits/stdint-uintn.h>
  23 #include <sys/socket.h>
  24 #include <bits/types.h>
  25
  26
  27 __BEGIN_DECLS
  28
  29 /* Internet address.  */
  30 typedef uint32_t in_addr_t;
  31 struct in_addr
  32   {
  33     in_addr_t s_addr;
  34   };
  35
  36 /* Get system-specific definitions.  */
  37 #include <bits/in.h>
  38
  39 /* Standard well-defined IP protocols.  */
  40 enum
  41   {
  42     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  43 #define IPPROTO_IP              IPPROTO_IP
  44     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  45 #define IPPROTO_ICMP            IPPROTO_ICMP
  46     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  47 #define IPPROTO_IGMP            IPPROTO_IGMP
  48     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  49 #define IPPROTO_IPIP            IPPROTO_IPIP
  50     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  51 #define IPPROTO_TCP             IPPROTO_TCP
  52     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  53 #define IPPROTO_EGP             IPPROTO_EGP
  54     IPPROTO_PUP = 12,      /* PUP protocol.  */
  55 #define IPPROTO_PUP             IPPROTO_PUP
  56     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  57 #define IPPROTO_UDP             IPPROTO_UDP
  58     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  59 #define IPPROTO_IDP             IPPROTO_IDP
  60     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  61 #define IPPROTO_TP              IPPROTO_TP
  62     IPPROTO_DCCP = 33,     /* Datagram Congestion Control Protocol.  */
  63 #define IPPROTO_DCCP            IPPROTO_DCCP
  64     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  65 #define IPPROTO_IPV6            IPPROTO_IPV6
  66     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  67 #define IPPROTO_RSVP            IPPROTO_RSVP
  68     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  69 #define IPPROTO_GRE             IPPROTO_GRE
  70     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  71 #define IPPROTO_ESP             IPPROTO_ESP
  72     IPPROTO_AH = 51,       /* authentication header.  */
  73 #define IPPROTO_AH              IPPROTO_AH
  74     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  75 #define IPPROTO_MTP             IPPROTO_MTP
  76     IPPROTO_BEETPH = 94,   /* IP option pseudo header for BEET.  */
  77 #define IPPROTO_BEETPH          IPPROTO_BEETPH
  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_MPLS = 137,    /* MPLS in IP.  */
  89 #define IPPROTO_MPLS            IPPROTO_MPLS
  90     IPPROTO_ETHERNET = 143, /* Ethernet-within-IPv6 Encapsulation.  */
  91 #define IPPROTO_ETHERNET        IPPROTO_ETHERNET
  92     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  93 #define IPPROTO_RAW             IPPROTO_RAW
  94     IPPROTO_MPTCP = 262,   /* Multipath TCP connection.  */
  95 #define IPPROTO_MPTCP           IPPROTO_MPTCP
  96     IPPROTO_MAX
  97   };
  98
  99 /* If __USE_KERNEL_IPV6_DEFS is 1 then the user has included the kernel
 100    network headers first and we should use those ABI-identical definitions
 101    instead of our own, otherwise 0.  */
 102 #if !__USE_KERNEL_IPV6_DEFS
 103 enum
 104   {
 105     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
 106 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
 107     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
 108 #define IPPROTO_ROUTING         IPPROTO_ROUTING
 109     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
 110 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
 111     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
 112 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
 113     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
 114 #define IPPROTO_NONE            IPPROTO_NONE
 115     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
 116 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
 117     IPPROTO_MH = 135       /* IPv6 mobility header.  */
 118 #define IPPROTO_MH              IPPROTO_MH
 119   };
 120 #endif /* !__USE_KERNEL_IPV6_DEFS */
 121
 122 /* Type to represent a port.  */
 123 typedef uint16_t in_port_t;
 124
 125 /* Standard well-known ports.  */
 126 enum
 127   {
 128     IPPORT_ECHO = 7,            /* Echo service.  */
 129     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 130     IPPORT_SYSTAT = 11,         /* System status service.  */
 131     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 132     IPPORT_NETSTAT = 15,        /* Network status service.  */
 133     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 134     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 135     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 136     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 137     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 138     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 139     IPPORT_MTP = 57,
 140
 141     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 142     IPPORT_RJE = 77,
 143     IPPORT_FINGER = 79,         /* Finger service.  */
 144     IPPORT_TTYLINK = 87,
 145     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 146
 147
 148     IPPORT_EXECSERVER = 512,    /* execd service.  */
 149     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 150     IPPORT_CMDSERVER = 514,
 151     IPPORT_EFSSERVER = 520,
 152
 153     /* UDP ports.  */
 154     IPPORT_BIFFUDP = 512,
 155     IPPORT_WHOSERVER = 513,
 156     IPPORT_ROUTESERVER = 520,
 157
 158     /* Ports less than this value are reserved for privileged processes.  */
 159     IPPORT_RESERVED = 1024,
 160
 161     /* Ports greater this value are reserved for (non-privileged) servers.  */
 162     IPPORT_USERRESERVED = 5000
 163   };
 164
 165 /* Definitions of the bits in an Internet address integer.
 166
 167    On subnets, host and network parts are found according to
 168    the subnet mask, not these masks.  */
 169
 170 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 171 #define IN_CLASSA_NET           0xff000000
 172 #define IN_CLASSA_NSHIFT        24
 173 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 174 #define IN_CLASSA_MAX           128
 175
 176 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 177 #define IN_CLASSB_NET           0xffff0000
 178 #define IN_CLASSB_NSHIFT        16
 179 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 180 #define IN_CLASSB_MAX           65536
 181
 182 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 183 #define IN_CLASSC_NET           0xffffff00
 184 #define IN_CLASSC_NSHIFT        8
 185 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 186
 187 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 188 #define IN_MULTICAST(a)         IN_CLASSD(a)
 189
 190 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 191 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 192
 193 /* Address to accept any incoming messages.  */
 194 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 195 /* Address to send to all hosts.  */
 196 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 197 /* Address indicating an error return.  */
 198 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 199 /* Dummy address for source of ICMPv6 errors converted to IPv4 (RFC
 200    7600).  */
 201 #define INADDR_DUMMY            ((in_addr_t) 0xc0000008)
 202
 203 /* Network number for local host loopback.  */
 204 #define IN_LOOPBACKNET          127
 205 /* Address to loopback in software to local host.  */
 206 #ifndef INADDR_LOOPBACK
 207 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 208 #endif
 209
 210 /* Defines for Multicast INADDR.  */
 211 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 212 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 213 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 214 #define INADDR_ALLSNOOPERS_GROUP ((in_addr_t) 0xe000006a) /* 224.0.0.106 */
 215 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 216
 217 #if !__USE_KERNEL_IPV6_DEFS
 218 /* IPv6 address */
 219 struct in6_addr
 220   {
 221     union
 222       {
 223         uint8_t __u6_addr8[16];
 224         uint16_t __u6_addr16[8];
 225         uint32_t __u6_addr32[4];
 226       } __in6_u;
 227 #define s6_addr                 __in6_u.__u6_addr8
 228 #ifdef __USE_MISC
 229 # define s6_addr16              __in6_u.__u6_addr16
 230 # define s6_addr32              __in6_u.__u6_addr32
 231 #endif
 232   };
 233 #endif /* !__USE_KERNEL_IPV6_DEFS */
 234
 235 extern const struct in6_addr in6addr_any;        /* :: */
 236 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 237 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 238 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 239
 240 #define INET_ADDRSTRLEN 16
 241 #define INET6_ADDRSTRLEN 46
 242
 243
 244 /* Structure describing an Internet socket address.  */
 245 struct sockaddr_in
 246   {
 247     __SOCKADDR_COMMON (sin_);
 248     in_port_t sin_port;                 /* Port number.  */
 249     struct in_addr sin_addr;            /* Internet address.  */
 250
 251     /* Pad to size of `struct sockaddr'.  */
 252     unsigned char sin_zero[sizeof (struct sockaddr)
 253                            - __SOCKADDR_COMMON_SIZE
 254                            - sizeof (in_port_t)
 255                            - sizeof (struct in_addr)];
 256   };
 257
 258 #if !__USE_KERNEL_IPV6_DEFS
 259 /* Ditto, for IPv6.  */
 260 struct sockaddr_in6
 261   {
 262     __SOCKADDR_COMMON (sin6_);
 263     in_port_t sin6_port;        /* Transport layer port # */
 264     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 265     struct in6_addr sin6_addr;  /* IPv6 address */
 266     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 267   };
 268 #endif /* !__USE_KERNEL_IPV6_DEFS */
 269
 270 #ifdef __USE_MISC
 271 /* IPv4 multicast request.  */
 272 struct ip_mreq
 273   {
 274     /* IP multicast address of group.  */
 275     struct in_addr imr_multiaddr;
 276
 277     /* Local IP address of interface.  */
 278     struct in_addr imr_interface;
 279   };
 280
 281 struct ip_mreq_source
 282   {
 283     /* IP multicast address of group.  */
 284     struct in_addr imr_multiaddr;
 285
 286     /* IP address of interface.  */
 287     struct in_addr imr_interface;
 288
 289     /* IP address of source.  */
 290     struct in_addr imr_sourceaddr;
 291   };
 292 #endif
 293
 294 #if !__USE_KERNEL_IPV6_DEFS
 295 /* Likewise, for IPv6.  */
 296 struct ipv6_mreq
 297   {
 298     /* IPv6 multicast address of group */
 299     struct in6_addr ipv6mr_multiaddr;
 300
 301     /* local interface */
 302     unsigned int ipv6mr_interface;
 303   };
 304 #endif /* !__USE_KERNEL_IPV6_DEFS */
 305
 306 #ifdef __USE_MISC
 307 /* Multicast group request.  */
 308 struct group_req
 309   {
 310     /* Interface index.  */
 311     uint32_t gr_interface;
 312
 313     /* Group address.  */
 314     struct sockaddr_storage gr_group;
 315   };
 316
 317 struct group_source_req
 318   {
 319     /* Interface index.  */
 320     uint32_t gsr_interface;
 321
 322     /* Group address.  */
 323     struct sockaddr_storage gsr_group;
 324
 325     /* Source address.  */
 326     struct sockaddr_storage gsr_source;
 327   };
 328
 329
 330 /* Full-state filter operations.  */
 331 struct ip_msfilter
 332   {
 333     /* IP multicast address of group.  */
 334     struct in_addr imsf_multiaddr;
 335
 336     /* Local IP address of interface.  */
 337     struct in_addr imsf_interface;
 338
 339     /* Filter mode.  */
 340     uint32_t imsf_fmode;
 341
 342     /* Number of source addresses.  */
 343     uint32_t imsf_numsrc;
 344     /* Source addresses.  */
 345     struct in_addr imsf_slist[1];
 346   };
 347
 348 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 349                                   - sizeof (struct in_addr)                   \
 350                                   + (numsrc) * sizeof (struct in_addr))
 351
 352 struct group_filter
 353   {
 354     /* Interface index.  */
 355     uint32_t gf_interface;
 356
 357     /* Group address.  */
 358     struct sockaddr_storage gf_group;
 359
 360     /* Filter mode.  */
 361     uint32_t gf_fmode;
 362
 363     /* Number of source addresses.  */
 364     uint32_t gf_numsrc;
 365     /* Source addresses.  */
 366     struct sockaddr_storage gf_slist[1];
 367 };
 368
 369 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 370                                    - sizeof (struct sockaddr_storage)         \
 371                                    + ((numsrc)                                \
 372                                       * sizeof (struct sockaddr_storage)))
 373 #endif
 374
 375 /* Functions to convert between host and network byte order.
 376
 377    Please note that these functions normally take `unsigned long int' or
 378    `unsigned short int' values as arguments and also return them.  But
 379    this was a short-sighted decision since on different systems the types
 380    may have different representations but the values are always the same.  */
 381
 382 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 383 extern uint16_t ntohs (uint16_t __netshort)
 384      __THROW __attribute__ ((__const__));
 385 extern uint32_t htonl (uint32_t __hostlong)
 386      __THROW __attribute__ ((__const__));
 387 extern uint16_t htons (uint16_t __hostshort)
 388      __THROW __attribute__ ((__const__));
 389
 390 #include <endian.h>
 391
 392 /* Get machine dependent optimized versions of byte swapping functions.  */
 393 #include <bits/byteswap.h>
 394 #include <bits/uintn-identity.h>
 395
 396 #ifdef __OPTIMIZE__
 397 /* We can optimize calls to the conversion functions.  Either nothing has
 398    to be done or we are using directly the byte-swapping functions which
 399    often can be inlined.  */
 400 # if __BYTE_ORDER == __BIG_ENDIAN
 401 /* The host byte order is the same as network byte order,
 402    so these functions are all just identity.  */
 403 # define ntohl(x)       __uint32_identity (x)
 404 # define ntohs(x)       __uint16_identity (x)
 405 # define htonl(x)       __uint32_identity (x)
 406 # define htons(x)       __uint16_identity (x)
 407 # else
 408 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 409 #   define ntohl(x)     __bswap_32 (x)
 410 #   define ntohs(x)     __bswap_16 (x)
 411 #   define htonl(x)     __bswap_32 (x)
 412 #   define htons(x)     __bswap_16 (x)
 413 #  endif
 414 # endif
 415 #endif
 416
 417 #ifdef __GNUC__
 418 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 419   (__extension__                                                              \
 420    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 421       __a->__in6_u.__u6_addr32[0] == 0                                        \
 422       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 423       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 424       && __a->__in6_u.__u6_addr32[3] == 0; }))
 425
 426 # define IN6_IS_ADDR_LOOPBACK(a) \
 427   (__extension__                                                              \
 428    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 429       __a->__in6_u.__u6_addr32[0] == 0                                        \
 430       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 431       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 432       && __a->__in6_u.__u6_addr32[3] == htonl (1); }))
 433
 434 # define IN6_IS_ADDR_LINKLOCAL(a) \
 435   (__extension__                                                              \
 436    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 437       (__a->__in6_u.__u6_addr32[0] & htonl (0xffc00000)) == htonl (0xfe800000); }))
 438
 439 # define IN6_IS_ADDR_SITELOCAL(a) \
 440   (__extension__                                                              \
 441    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 442       (__a->__in6_u.__u6_addr32[0] & htonl (0xffc00000)) == htonl (0xfec00000); }))
 443
 444 # define IN6_IS_ADDR_V4MAPPED(a) \
 445   (__extension__                                                              \
 446    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 447       __a->__in6_u.__u6_addr32[0] == 0                                        \
 448       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 449       && __a->__in6_u.__u6_addr32[2] == htonl (0xffff); }))
 450
 451 # define IN6_IS_ADDR_V4COMPAT(a) \
 452   (__extension__                                                              \
 453    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 454       __a->__in6_u.__u6_addr32[0] == 0                                        \
 455       && __a->__in6_u.__u6_addr32[1] == 0                                     \
 456       && __a->__in6_u.__u6_addr32[2] == 0                                     \
 457       && ntohl (__a->__in6_u.__u6_addr32[3]) > 1; }))
 458
 459 # define IN6_ARE_ADDR_EQUAL(a,b) \
 460   (__extension__                                                              \
 461    ({ const struct in6_addr *__a = (const struct in6_addr *) (a);             \
 462       const struct in6_addr *__b = (const struct in6_addr *) (b);             \
 463       __a->__in6_u.__u6_addr32[0] == __b->__in6_u.__u6_addr32[0]              \
 464       && __a->__in6_u.__u6_addr32[1] == __b->__in6_u.__u6_addr32[1]           \
 465       && __a->__in6_u.__u6_addr32[2] == __b->__in6_u.__u6_addr32[2]           \
 466       && __a->__in6_u.__u6_addr32[3] == __b->__in6_u.__u6_addr32[3]; }))
 467 #else
 468 # define IN6_IS_ADDR_UNSPECIFIED(a) \
 469         (((const uint32_t *) (a))[0] == 0                                     \
 470          && ((const uint32_t *) (a))[1] == 0                                  \
 471          && ((const uint32_t *) (a))[2] == 0                                  \
 472          && ((const uint32_t *) (a))[3] == 0)
 473
 474 # define IN6_IS_ADDR_LOOPBACK(a) \
 475         (((const uint32_t *) (a))[0] == 0                                     \
 476          && ((const uint32_t *) (a))[1] == 0                                  \
 477          && ((const uint32_t *) (a))[2] == 0                                  \
 478          && ((const uint32_t *) (a))[3] == htonl (1))
 479
 480 # define IN6_IS_ADDR_LINKLOCAL(a) \
 481         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 482          == htonl (0xfe800000))
 483
 484 # define IN6_IS_ADDR_SITELOCAL(a) \
 485         ((((const uint32_t *) (a))[0] & htonl (0xffc00000))                   \
 486          == htonl (0xfec00000))
 487
 488 # define IN6_IS_ADDR_V4MAPPED(a) \
 489         ((((const uint32_t *) (a))[0] == 0)                                   \
 490          && (((const uint32_t *) (a))[1] == 0)                                \
 491          && (((const uint32_t *) (a))[2] == htonl (0xffff)))
 492
 493 # define IN6_IS_ADDR_V4COMPAT(a) \
 494         ((((const uint32_t *) (a))[0] == 0)                                   \
 495          && (((const uint32_t *) (a))[1] == 0)                                \
 496          && (((const uint32_t *) (a))[2] == 0)                                \
 497          && (ntohl (((const uint32_t *) (a))[3]) > 1))
 498
 499 # define IN6_ARE_ADDR_EQUAL(a,b) \
 500         ((((const uint32_t *) (a))[0] == ((const uint32_t *) (b))[0])         \
 501          && (((const uint32_t *) (a))[1] == ((const uint32_t *) (b))[1])      \
 502          && (((const uint32_t *) (a))[2] == ((const uint32_t *) (b))[2])      \
 503          && (((const uint32_t *) (a))[3] == ((const uint32_t *) (b))[3]))
 504 #endif
 505
 506 #define IN6_IS_ADDR_MULTICAST(a) (((const uint8_t *) (a))[0] == 0xff)
 507
 508 #ifdef __USE_MISC
 509 /* Bind socket to a privileged IP port.  */
 510 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 511
 512 /* The IPv6 version of this function.  */
 513 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 514      __THROW;
 515 #endif
 516
 517
 518 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 519         (IN6_IS_ADDR_MULTICAST(a)                                             \
 520          && ((((const uint8_t *) (a))[1] & 0xf) == 0x1))
 521
 522 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 523         (IN6_IS_ADDR_MULTICAST(a)                                             \
 524          && ((((const uint8_t *) (a))[1] & 0xf) == 0x2))
 525
 526 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 527         (IN6_IS_ADDR_MULTICAST(a)                                             \
 528          && ((((const uint8_t *) (a))[1] & 0xf) == 0x5))
 529
 530 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 531         (IN6_IS_ADDR_MULTICAST(a)                                             \
 532          && ((((const uint8_t *) (a))[1] & 0xf) == 0x8))
 533
 534 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 535         (IN6_IS_ADDR_MULTICAST(a)                                             \
 536          && ((((const uint8_t *) (a))[1] & 0xf) == 0xe))
 537
 538
 539 #ifdef __USE_GNU
 540 struct cmsghdr;                 /* Forward declaration.  */
 541
 542 #if !__USE_KERNEL_IPV6_DEFS
 543 /* IPv6 packet information.  */
 544 struct in6_pktinfo
 545   {
 546     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 547     unsigned int ipi6_ifindex;  /* send/recv interface index */
 548   };
 549
 550 /* IPv6 MTU information.  */
 551 struct ip6_mtuinfo
 552   {
 553     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 554     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 555   };
 556 #endif /* !__USE_KERNEL_IPV6_DEFS */
 557
 558 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 559 extern int inet6_option_space (int __nbytes)
 560      __THROW __attribute_deprecated__;
 561 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 562                               int __type) __THROW __attribute_deprecated__;
 563 extern int inet6_option_append (struct cmsghdr *__cmsg,
 564                                 const uint8_t *__typep, int __multx,
 565                                 int __plusy) __THROW __attribute_deprecated__;
 566 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 567                                     int __multx, int __plusy)
 568      __THROW __attribute_deprecated__;
 569 extern int inet6_option_next (const struct cmsghdr *__cmsg,
 570                               uint8_t **__tptrp)
 571      __THROW __attribute_deprecated__;
 572 extern int inet6_option_find (const struct cmsghdr *__cmsg,
 573                               uint8_t **__tptrp, int __type)
 574      __THROW __attribute_deprecated__;
 575
 576
 577 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 578 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 579 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 580                              uint8_t __type, socklen_t __len, uint8_t __align,
 581                              void **__databufp) __THROW;
 582 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 583      __THROW;
 584 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 585                               socklen_t __vallen) __THROW;
 586 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 587                            uint8_t *__typep, socklen_t *__lenp,
 588                            void **__databufp) __THROW;
 589 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 590                            uint8_t __type, socklen_t *__lenp,
 591                            void **__databufp) __THROW;
 592 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 593                               socklen_t __vallen) __THROW;
 594
 595
 596 /* Routing Header Option (RFC 3542).  */
 597 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 598 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 599                              int __segments) __THROW;
 600 extern int inet6_rth_add (void *__bp, const struct in6_addr *__addr) __THROW;
 601 extern int inet6_rth_reverse (const void *__in, void *__out) __THROW;
 602 extern int inet6_rth_segments (const void *__bp) __THROW;
 603 extern struct in6_addr *inet6_rth_getaddr (const void *__bp, int __index)
 604      __THROW;
 605
 606
 607 /* Multicast source filter support.  */
 608
 609 /* Get IPv4 source filter.  */
 610 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 611                                 struct in_addr __group, uint32_t *__fmode,
 612                                 uint32_t *__numsrc, struct in_addr *__slist)
 613      __THROW;
 614
 615 /* Set IPv4 source filter.  */
 616 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 617                                 struct in_addr __group, uint32_t __fmode,
 618                                 uint32_t __numsrc,
 619                                 const struct in_addr *__slist)
 620      __THROW;
 621
 622
 623 /* Get source filter.  */
 624 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 625                             const struct sockaddr *__group,
 626                             socklen_t __grouplen, uint32_t *__fmode,
 627                             uint32_t *__numsrc,
 628                             struct sockaddr_storage *__slist) __THROW;
 629
 630 /* Set source filter.  */
 631 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 632                             const struct sockaddr *__group,
 633                             socklen_t __grouplen, uint32_t __fmode,
 634                             uint32_t __numsrc,
 635                             const struct sockaddr_storage *__slist) __THROW;
 636 #endif  /* use GNU */
 637
 638 __END_DECLS
 639
 640 #endif  /* netinet/in.h */