inet/netinet/in.h

   1 /* Copyright (C) 1991-2001, 2003, 2004, 2006, 2007, 2008
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _NETINET_IN_H
  21 #define _NETINET_IN_H   1
  22
  23 #include <features.h>
  24 #include <stdint.h>
  25 #include <sys/socket.h>
  26 #include <bits/types.h>
  27
  28
  29 __BEGIN_DECLS
  30
  31 /* Standard well-defined IP protocols.  */
  32 enum
  33   {
  34     IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
  35 #define IPPROTO_IP              IPPROTO_IP
  36     IPPROTO_HOPOPTS = 0,   /* IPv6 Hop-by-Hop options.  */
  37 #define IPPROTO_HOPOPTS         IPPROTO_HOPOPTS
  38     IPPROTO_ICMP = 1,      /* Internet Control Message Protocol.  */
  39 #define IPPROTO_ICMP            IPPROTO_ICMP
  40     IPPROTO_IGMP = 2,      /* Internet Group Management Protocol. */
  41 #define IPPROTO_IGMP            IPPROTO_IGMP
  42     IPPROTO_IPIP = 4,      /* IPIP tunnels (older KA9Q tunnels use 94).  */
  43 #define IPPROTO_IPIP            IPPROTO_IPIP
  44     IPPROTO_TCP = 6,       /* Transmission Control Protocol.  */
  45 #define IPPROTO_TCP             IPPROTO_TCP
  46     IPPROTO_EGP = 8,       /* Exterior Gateway Protocol.  */
  47 #define IPPROTO_EGP             IPPROTO_EGP
  48     IPPROTO_PUP = 12,      /* PUP protocol.  */
  49 #define IPPROTO_PUP             IPPROTO_PUP
  50     IPPROTO_UDP = 17,      /* User Datagram Protocol.  */
  51 #define IPPROTO_UDP             IPPROTO_UDP
  52     IPPROTO_IDP = 22,      /* XNS IDP protocol.  */
  53 #define IPPROTO_IDP             IPPROTO_IDP
  54     IPPROTO_TP = 29,       /* SO Transport Protocol Class 4.  */
  55 #define IPPROTO_TP              IPPROTO_TP
  56     IPPROTO_DCCP = 33,     /* Datagram Congestion Control Protocol.  */
  57 #define IPPROTO_DCCP            IPPROTO_DCCP
  58     IPPROTO_IPV6 = 41,     /* IPv6 header.  */
  59 #define IPPROTO_IPV6            IPPROTO_IPV6
  60     IPPROTO_ROUTING = 43,  /* IPv6 routing header.  */
  61 #define IPPROTO_ROUTING         IPPROTO_ROUTING
  62     IPPROTO_FRAGMENT = 44, /* IPv6 fragmentation header.  */
  63 #define IPPROTO_FRAGMENT        IPPROTO_FRAGMENT
  64     IPPROTO_RSVP = 46,     /* Reservation Protocol.  */
  65 #define IPPROTO_RSVP            IPPROTO_RSVP
  66     IPPROTO_GRE = 47,      /* General Routing Encapsulation.  */
  67 #define IPPROTO_GRE             IPPROTO_GRE
  68     IPPROTO_ESP = 50,      /* encapsulating security payload.  */
  69 #define IPPROTO_ESP             IPPROTO_ESP
  70     IPPROTO_AH = 51,       /* authentication header.  */
  71 #define IPPROTO_AH              IPPROTO_AH
  72     IPPROTO_ICMPV6 = 58,   /* ICMPv6.  */
  73 #define IPPROTO_ICMPV6          IPPROTO_ICMPV6
  74     IPPROTO_NONE = 59,     /* IPv6 no next header.  */
  75 #define IPPROTO_NONE            IPPROTO_NONE
  76     IPPROTO_DSTOPTS = 60,  /* IPv6 destination options.  */
  77 #define IPPROTO_DSTOPTS         IPPROTO_DSTOPTS
  78     IPPROTO_MTP = 92,      /* Multicast Transport Protocol.  */
  79 #define IPPROTO_MTP             IPPROTO_MTP
  80     IPPROTO_ENCAP = 98,    /* Encapsulation Header.  */
  81 #define IPPROTO_ENCAP           IPPROTO_ENCAP
  82     IPPROTO_PIM = 103,     /* Protocol Independent Multicast.  */
  83 #define IPPROTO_PIM             IPPROTO_PIM
  84     IPPROTO_COMP = 108,    /* Compression Header Protocol.  */
  85 #define IPPROTO_COMP            IPPROTO_COMP
  86     IPPROTO_SCTP = 132,    /* Stream Control Transmission Protocol.  */
  87 #define IPPROTO_SCTP            IPPROTO_SCTP
  88     IPPROTO_UDPLITE = 136, /* UDP-Lite protocol.  */
  89 #define IPPROTO_UDPLITE         IPPROTO_UDPLITE
  90     IPPROTO_RAW = 255,     /* Raw IP packets.  */
  91 #define IPPROTO_RAW             IPPROTO_RAW
  92     IPPROTO_MAX
  93   };
  94
  95
  96 /* Type to represent a port.  */
  97 typedef uint16_t in_port_t;
  98
  99 /* Standard well-known ports.  */
 100 enum
 101   {
 102     IPPORT_ECHO = 7,            /* Echo service.  */
 103     IPPORT_DISCARD = 9,         /* Discard transmissions service.  */
 104     IPPORT_SYSTAT = 11,         /* System status service.  */
 105     IPPORT_DAYTIME = 13,        /* Time of day service.  */
 106     IPPORT_NETSTAT = 15,        /* Network status service.  */
 107     IPPORT_FTP = 21,            /* File Transfer Protocol.  */
 108     IPPORT_TELNET = 23,         /* Telnet protocol.  */
 109     IPPORT_SMTP = 25,           /* Simple Mail Transfer Protocol.  */
 110     IPPORT_TIMESERVER = 37,     /* Timeserver service.  */
 111     IPPORT_NAMESERVER = 42,     /* Domain Name Service.  */
 112     IPPORT_WHOIS = 43,          /* Internet Whois service.  */
 113     IPPORT_MTP = 57,
 114
 115     IPPORT_TFTP = 69,           /* Trivial File Transfer Protocol.  */
 116     IPPORT_RJE = 77,
 117     IPPORT_FINGER = 79,         /* Finger service.  */
 118     IPPORT_TTYLINK = 87,
 119     IPPORT_SUPDUP = 95,         /* SUPDUP protocol.  */
 120
 121
 122     IPPORT_EXECSERVER = 512,    /* execd service.  */
 123     IPPORT_LOGINSERVER = 513,   /* rlogind service.  */
 124     IPPORT_CMDSERVER = 514,
 125     IPPORT_EFSSERVER = 520,
 126
 127     /* UDP ports.  */
 128     IPPORT_BIFFUDP = 512,
 129     IPPORT_WHOSERVER = 513,
 130     IPPORT_ROUTESERVER = 520,
 131
 132     /* Ports less than this value are reserved for privileged processes.  */
 133     IPPORT_RESERVED = 1024,
 134
 135     /* Ports greater this value are reserved for (non-privileged) servers.  */
 136     IPPORT_USERRESERVED = 5000
 137   };
 138
 139
 140 /* Internet address.  */
 141 typedef uint32_t in_addr_t;
 142 struct in_addr
 143   {
 144     in_addr_t s_addr;
 145   };
 146
 147
 148 /* Definitions of the bits in an Internet address integer.
 149
 150    On subnets, host and network parts are found according to
 151    the subnet mask, not these masks.  */
 152
 153 #define IN_CLASSA(a)            ((((in_addr_t)(a)) & 0x80000000) == 0)
 154 #define IN_CLASSA_NET           0xff000000
 155 #define IN_CLASSA_NSHIFT        24
 156 #define IN_CLASSA_HOST          (0xffffffff & ~IN_CLASSA_NET)
 157 #define IN_CLASSA_MAX           128
 158
 159 #define IN_CLASSB(a)            ((((in_addr_t)(a)) & 0xc0000000) == 0x80000000)
 160 #define IN_CLASSB_NET           0xffff0000
 161 #define IN_CLASSB_NSHIFT        16
 162 #define IN_CLASSB_HOST          (0xffffffff & ~IN_CLASSB_NET)
 163 #define IN_CLASSB_MAX           65536
 164
 165 #define IN_CLASSC(a)            ((((in_addr_t)(a)) & 0xe0000000) == 0xc0000000)
 166 #define IN_CLASSC_NET           0xffffff00
 167 #define IN_CLASSC_NSHIFT        8
 168 #define IN_CLASSC_HOST          (0xffffffff & ~IN_CLASSC_NET)
 169
 170 #define IN_CLASSD(a)            ((((in_addr_t)(a)) & 0xf0000000) == 0xe0000000)
 171 #define IN_MULTICAST(a)         IN_CLASSD(a)
 172
 173 #define IN_EXPERIMENTAL(a)      ((((in_addr_t)(a)) & 0xe0000000) == 0xe0000000)
 174 #define IN_BADCLASS(a)          ((((in_addr_t)(a)) & 0xf0000000) == 0xf0000000)
 175
 176 /* Address to accept any incoming messages.  */
 177 #define INADDR_ANY              ((in_addr_t) 0x00000000)
 178 /* Address to send to all hosts.  */
 179 #define INADDR_BROADCAST        ((in_addr_t) 0xffffffff)
 180 /* Address indicating an error return.  */
 181 #define INADDR_NONE             ((in_addr_t) 0xffffffff)
 182
 183 /* Network number for local host loopback.  */
 184 #define IN_LOOPBACKNET          127
 185 /* Address to loopback in software to local host.  */
 186 #ifndef INADDR_LOOPBACK
 187 # define INADDR_LOOPBACK        ((in_addr_t) 0x7f000001) /* Inet 127.0.0.1.  */
 188 #endif
 189
 190 /* Defines for Multicast INADDR.  */
 191 #define INADDR_UNSPEC_GROUP     ((in_addr_t) 0xe0000000) /* 224.0.0.0 */
 192 #define INADDR_ALLHOSTS_GROUP   ((in_addr_t) 0xe0000001) /* 224.0.0.1 */
 193 #define INADDR_ALLRTRS_GROUP    ((in_addr_t) 0xe0000002) /* 224.0.0.2 */
 194 #define INADDR_MAX_LOCAL_GROUP  ((in_addr_t) 0xe00000ff) /* 224.0.0.255 */
 195
 196
 197 /* IPv6 address */
 198 struct in6_addr
 199   {
 200     union
 201       {
 202         uint8_t __u6_addr8[16];
 203 #if defined __USE_MISC || defined __USE_GNU
 204         uint16_t __u6_addr16[8];
 205         uint32_t __u6_addr32[4];
 206 #endif
 207       } __in6_u;
 208 #define s6_addr                 __in6_u.__u6_addr8
 209 #if defined __USE_MISC || defined __USE_GNU
 210 # define s6_addr16              __in6_u.__u6_addr16
 211 # define s6_addr32              __in6_u.__u6_addr32
 212 #endif
 213   };
 214
 215 extern const struct in6_addr in6addr_any;        /* :: */
 216 extern const struct in6_addr in6addr_loopback;   /* ::1 */
 217 #define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
 218 #define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
 219
 220 #define INET_ADDRSTRLEN 16
 221 #define INET6_ADDRSTRLEN 46
 222
 223
 224 /* Structure describing an Internet socket address.  */
 225 struct sockaddr_in
 226   {
 227     __SOCKADDR_COMMON (sin_);
 228     in_port_t sin_port;                 /* Port number.  */
 229     struct in_addr sin_addr;            /* Internet address.  */
 230
 231     /* Pad to size of `struct sockaddr'.  */
 232     unsigned char sin_zero[sizeof (struct sockaddr) -
 233                            __SOCKADDR_COMMON_SIZE -
 234                            sizeof (in_port_t) -
 235                            sizeof (struct in_addr)];
 236   };
 237
 238 /* Ditto, for IPv6.  */
 239 struct sockaddr_in6
 240   {
 241     __SOCKADDR_COMMON (sin6_);
 242     in_port_t sin6_port;        /* Transport layer port # */
 243     uint32_t sin6_flowinfo;     /* IPv6 flow information */
 244     struct in6_addr sin6_addr;  /* IPv6 address */
 245     uint32_t sin6_scope_id;     /* IPv6 scope-id */
 246   };
 247
 248
 249 #if defined __USE_MISC || defined __USE_GNU
 250 /* IPv4 multicast request.  */
 251 struct ip_mreq
 252   {
 253     /* IP multicast address of group.  */
 254     struct in_addr imr_multiaddr;
 255
 256     /* Local IP address of interface.  */
 257     struct in_addr imr_interface;
 258   };
 259
 260 struct ip_mreq_source
 261   {
 262     /* IP multicast address of group.  */
 263     struct in_addr imr_multiaddr;
 264
 265     /* IP address of source.  */
 266     struct in_addr imr_interface;
 267
 268     /* IP address of interface.  */
 269     struct in_addr imr_sourceaddr;
 270   };
 271 #endif
 272
 273
 274 /* Likewise, for IPv6.  */
 275 struct ipv6_mreq
 276   {
 277     /* IPv6 multicast address of group */
 278     struct in6_addr ipv6mr_multiaddr;
 279
 280     /* local interface */
 281     unsigned int ipv6mr_interface;
 282   };
 283
 284
 285 #if defined __USE_MISC || defined __USE_GNU
 286 /* Multicast group request.  */
 287 struct group_req
 288   {
 289     /* Interface index.  */
 290     uint32_t gr_interface;
 291
 292     /* Group address.  */
 293     struct sockaddr_storage gr_group;
 294   };
 295
 296 struct group_source_req
 297   {
 298     /* Interface index.  */
 299     uint32_t gsr_interface;
 300
 301     /* Group address.  */
 302     struct sockaddr_storage gsr_group;
 303
 304     /* Source address.  */
 305     struct sockaddr_storage gsr_source;
 306   };
 307
 308
 309 /* Full-state filter operations.  */
 310 struct ip_msfilter
 311   {
 312     /* IP multicast address of group.  */
 313     struct in_addr imsf_multiaddr;
 314
 315     /* Local IP address of interface.  */
 316     struct in_addr imsf_interface;
 317
 318     /* Filter mode.  */
 319     uint32_t imsf_fmode;
 320
 321     /* Number of source addresses.  */
 322     uint32_t imsf_numsrc;
 323     /* Source addresses.  */
 324     struct in_addr imsf_slist[1];
 325   };
 326
 327 #define IP_MSFILTER_SIZE(numsrc) (sizeof (struct ip_msfilter) \
 328                                   - sizeof (struct in_addr)                   \
 329                                   + (numsrc) * sizeof (struct in_addr))
 330
 331 struct group_filter
 332   {
 333     /* Interface index.  */
 334     uint32_t gf_interface;
 335
 336     /* Group address.  */
 337     struct sockaddr_storage gf_group;
 338
 339     /* Filter mode.  */
 340     uint32_t gf_fmode;
 341
 342     /* Number of source addresses.  */
 343     uint32_t gf_numsrc;
 344     /* Source addresses.  */
 345     struct sockaddr_storage gf_slist[1];
 346 };
 347
 348 #define GROUP_FILTER_SIZE(numsrc) (sizeof (struct group_filter) \
 349                                    - sizeof (struct sockaddr_storage)         \
 350                                    + ((numsrc)                                \
 351                                       * sizeof (struct sockaddr_storage)))
 352 #endif
 353
 354
 355 /* Get system-specific definitions.  */
 356 #include <bits/in.h>
 357
 358 /* Functions to convert between host and network byte order.
 359
 360    Please note that these functions normally take `unsigned long int' or
 361    `unsigned short int' values as arguments and also return them.  But
 362    this was a short-sighted decision since on different systems the types
 363    may have different representations but the values are always the same.  */
 364
 365 extern uint32_t ntohl (uint32_t __netlong) __THROW __attribute__ ((__const__));
 366 extern uint16_t ntohs (uint16_t __netshort)
 367      __THROW __attribute__ ((__const__));
 368 extern uint32_t htonl (uint32_t __hostlong)
 369      __THROW __attribute__ ((__const__));
 370 extern uint16_t htons (uint16_t __hostshort)
 371      __THROW __attribute__ ((__const__));
 372
 373 #include <endian.h>
 374
 375 /* Get machine dependent optimized versions of byte swapping functions.  */
 376 #include <bits/byteswap.h>
 377
 378 #ifdef __OPTIMIZE__
 379 /* We can optimize calls to the conversion functions.  Either nothing has
 380    to be done or we are using directly the byte-swapping functions which
 381    often can be inlined.  */
 382 # if __BYTE_ORDER == __BIG_ENDIAN
 383 /* The host byte order is the same as network byte order,
 384    so these functions are all just identity.  */
 385 # define ntohl(x)       (x)
 386 # define ntohs(x)       (x)
 387 # define htonl(x)       (x)
 388 # define htons(x)       (x)
 389 # else
 390 #  if __BYTE_ORDER == __LITTLE_ENDIAN
 391 #   define ntohl(x)     __bswap_32 (x)
 392 #   define ntohs(x)     __bswap_16 (x)
 393 #   define htonl(x)     __bswap_32 (x)
 394 #   define htons(x)     __bswap_16 (x)
 395 #  endif
 396 # endif
 397 #endif
 398
 399 #define IN6_IS_ADDR_UNSPECIFIED(a) \
 400         (((__const uint32_t *) (a))[0] == 0                                   \
 401          && ((__const uint32_t *) (a))[1] == 0                                \
 402          && ((__const uint32_t *) (a))[2] == 0                                \
 403          && ((__const uint32_t *) (a))[3] == 0)
 404
 405 #define IN6_IS_ADDR_LOOPBACK(a) \
 406         (((__const uint32_t *) (a))[0] == 0                                   \
 407          && ((__const uint32_t *) (a))[1] == 0                                \
 408          && ((__const uint32_t *) (a))[2] == 0                                \
 409          && ((__const uint32_t *) (a))[3] == htonl (1))
 410
 411 #define IN6_IS_ADDR_MULTICAST(a) (((__const uint8_t *) (a))[0] == 0xff)
 412
 413 #define IN6_IS_ADDR_LINKLOCAL(a) \
 414         ((((__const uint32_t *) (a))[0] & htonl (0xffc00000))                 \
 415          == htonl (0xfe800000))
 416
 417 #define IN6_IS_ADDR_SITELOCAL(a) \
 418         ((((__const uint32_t *) (a))[0] & htonl (0xffc00000))                 \
 419          == htonl (0xfec00000))
 420
 421 #define IN6_IS_ADDR_V4MAPPED(a) \
 422         ((((__const uint32_t *) (a))[0] == 0)                                 \
 423          && (((__const uint32_t *) (a))[1] == 0)                              \
 424          && (((__const uint32_t *) (a))[2] == htonl (0xffff)))
 425
 426 #define IN6_IS_ADDR_V4COMPAT(a) \
 427         ((((__const uint32_t *) (a))[0] == 0)                                 \
 428          && (((__const uint32_t *) (a))[1] == 0)                              \
 429          && (((__const uint32_t *) (a))[2] == 0)                              \
 430          && (ntohl (((__const uint32_t *) (a))[3]) > 1))
 431
 432 #define IN6_ARE_ADDR_EQUAL(a,b) \
 433         ((((__const uint32_t *) (a))[0] == ((__const uint32_t *) (b))[0])     \
 434          && (((__const uint32_t *) (a))[1] == ((__const uint32_t *) (b))[1])  \
 435          && (((__const uint32_t *) (a))[2] == ((__const uint32_t *) (b))[2])  \
 436          && (((__const uint32_t *) (a))[3] == ((__const uint32_t *) (b))[3]))
 437
 438 #if defined __USE_MISC || defined __USE_GNU
 439 /* Bind socket to a privileged IP port.  */
 440 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) __THROW;
 441
 442 /* The IPv6 version of this function.  */
 443 extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in)
 444      __THROW;
 445 #endif
 446
 447
 448 #define IN6_IS_ADDR_MC_NODELOCAL(a) \
 449         (IN6_IS_ADDR_MULTICAST(a)                                             \
 450          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x1))
 451
 452 #define IN6_IS_ADDR_MC_LINKLOCAL(a) \
 453         (IN6_IS_ADDR_MULTICAST(a)                                             \
 454          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x2))
 455
 456 #define IN6_IS_ADDR_MC_SITELOCAL(a) \
 457         (IN6_IS_ADDR_MULTICAST(a)                                             \
 458          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x5))
 459
 460 #define IN6_IS_ADDR_MC_ORGLOCAL(a) \
 461         (IN6_IS_ADDR_MULTICAST(a)                                             \
 462          && ((((__const uint8_t *) (a))[1] & 0xf) == 0x8))
 463
 464 #define IN6_IS_ADDR_MC_GLOBAL(a) \
 465         (IN6_IS_ADDR_MULTICAST(a)                                             \
 466          && ((((__const uint8_t *) (a))[1] & 0xf) == 0xe))
 467
 468
 469 #ifdef __USE_GNU
 470 /* IPv6 packet information.  */
 471 struct in6_pktinfo
 472   {
 473     struct in6_addr ipi6_addr;  /* src/dst IPv6 address */
 474     unsigned int ipi6_ifindex;  /* send/recv interface index */
 475   };
 476
 477 /* IPv6 MTU information.  */
 478 struct ip6_mtuinfo
 479   {
 480     struct sockaddr_in6 ip6m_addr; /* dst address including zone ID */
 481     uint32_t ip6m_mtu;             /* path MTU in host byte order */
 482   };
 483
 484
 485 /* Obsolete hop-by-hop and Destination Options Processing (RFC 2292).  */
 486 extern int inet6_option_space (int __nbytes)
 487      __THROW __attribute_deprecated__;
 488 extern int inet6_option_init (void *__bp, struct cmsghdr **__cmsgp,
 489                               int __type) __THROW __attribute_deprecated__;
 490 extern int inet6_option_append (struct cmsghdr *__cmsg,
 491                                 __const uint8_t *__typep, int __multx,
 492                                 int __plusy) __THROW __attribute_deprecated__;
 493 extern uint8_t *inet6_option_alloc (struct cmsghdr *__cmsg, int __datalen,
 494                                     int __multx, int __plusy)
 495      __THROW __attribute_deprecated__;
 496 extern int inet6_option_next (__const struct cmsghdr *__cmsg,
 497                               uint8_t **__tptrp)
 498      __THROW __attribute_deprecated__;
 499 extern int inet6_option_find (__const struct cmsghdr *__cmsg,
 500                               uint8_t **__tptrp, int __type)
 501      __THROW __attribute_deprecated__;
 502
 503
 504 /* Hop-by-Hop and Destination Options Processing (RFC 3542).  */
 505 extern int inet6_opt_init (void *__extbuf, socklen_t __extlen) __THROW;
 506 extern int inet6_opt_append (void *__extbuf, socklen_t __extlen, int __offset,
 507                              uint8_t __type, socklen_t __len, uint8_t __align,
 508                              void **__databufp) __THROW;
 509 extern int inet6_opt_finish (void *__extbuf, socklen_t __extlen, int __offset)
 510      __THROW;
 511 extern int inet6_opt_set_val (void *__databuf, int __offset, void *__val,
 512                               socklen_t __vallen) __THROW;
 513 extern int inet6_opt_next (void *__extbuf, socklen_t __extlen, int __offset,
 514                            uint8_t *__typep, socklen_t *__lenp,
 515                            void **__databufp) __THROW;
 516 extern int inet6_opt_find (void *__extbuf, socklen_t __extlen, int __offset,
 517                            uint8_t __type, socklen_t *__lenp,
 518                            void **__databufp) __THROW;
 519 extern int inet6_opt_get_val (void *__databuf, int __offset, void *__val,
 520                               socklen_t __vallen) __THROW;
 521
 522
 523 /* Routing Header Option (RFC 3542).  */
 524 extern socklen_t inet6_rth_space (int __type, int __segments) __THROW;
 525 extern void *inet6_rth_init (void *__bp, socklen_t __bp_len, int __type,
 526                              int __segments) __THROW;
 527 extern int inet6_rth_add (void *__bp, __const struct in6_addr *__addr) __THROW;
 528 extern int inet6_rth_reverse (__const void *__in, void *__out) __THROW;
 529 extern int inet6_rth_segments (__const void *__bp) __THROW;
 530 extern struct in6_addr *inet6_rth_getaddr (__const void *__bp, int __index)
 531      __THROW;
 532
 533
 534 /* Multicast source filter support.  */
 535
 536 /* Get IPv4 source filter.  */
 537 extern int getipv4sourcefilter (int __s, struct in_addr __interface_addr,
 538                                 struct in_addr __group, uint32_t *__fmode,
 539                                 uint32_t *__numsrc, struct in_addr *__slist)
 540      __THROW;
 541
 542 /* Set IPv4 source filter.  */
 543 extern int setipv4sourcefilter (int __s, struct in_addr __interface_addr,
 544                                 struct in_addr __group, uint32_t __fmode,
 545                                 uint32_t __numsrc,
 546                                 __const struct in_addr *__slist)
 547      __THROW;
 548
 549
 550 /* Get source filter.  */
 551 extern int getsourcefilter (int __s, uint32_t __interface_addr,
 552                             __const struct sockaddr *__group,
 553                             socklen_t __grouplen, uint32_t *__fmode,
 554                             uint32_t *__numsrc,
 555                             struct sockaddr_storage *__slist) __THROW;
 556
 557 /* Set source filter.  */
 558 extern int setsourcefilter (int __s, uint32_t __interface_addr,
 559                             __const struct sockaddr *__group,
 560                             socklen_t __grouplen, uint32_t __fmode,
 561                             uint32_t __numsrc,
 562                             __const struct sockaddr_storage *__slist) __THROW;
 563 #endif  /* use GNU */
 564
 565 __END_DECLS
 566
 567 #endif  /* netinet/in.h */