bits/socket.h

   1 /* System-specific socket constants and types.  4.4 BSD version.
   2    Copyright (C) 1991-2017 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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If
  17    not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef __BITS_SOCKET_H
  20 #define __BITS_SOCKET_H 1
  21
  22 #ifndef _SYS_SOCKET_H
  23 # error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
  24 #endif
  25
  26 #define __need_size_t
  27 #define __need_NULL
  28 #include <stddef.h>
  29
  30 #include <limits.h>             /* XXX Is this allowed?  */
  31 #include <bits/types.h>
  32
  33 /* Type for length arguments in socket calls.  */
  34 #ifndef __socklen_t_defined
  35 typedef __socklen_t socklen_t;
  36 # define __socklen_t_defined
  37 #endif
  38
  39
  40 /* Types of sockets.  */
  41 enum __socket_type
  42 {
  43   SOCK_STREAM = 1,              /* Sequenced, reliable, connection-based
  44                                    byte streams.  */
  45 #define SOCK_STREAM SOCK_STREAM
  46   SOCK_DGRAM = 2,               /* Connectionless, unreliable datagrams
  47                                    of fixed maximum length.  */
  48 #define SOCK_DGRAM SOCK_DGRAM
  49   SOCK_RAW = 3,                 /* Raw protocol interface.  */
  50 #define SOCK_RAW SOCK_RAW
  51   SOCK_RDM = 4,                 /* Reliably-delivered messages.  */
  52 #define SOCK_RDM SOCK_RDM
  53   SOCK_SEQPACKET = 5,           /* Sequenced, reliable, connection-based,
  54                                    datagrams of fixed maximum length.  */
  55 #define SOCK_SEQPACKET SOCK_SEQPACKET
  56
  57 #define SOCK_MAX (SOCK_SEQPACKET + 1)
  58   /* Mask which covers at least up to SOCK_MASK-1.
  59      The remaining bits are used as flags. */
  60 #define SOCK_TYPE_MASK 0xf
  61
  62   /* Flags to be ORed into the type parameter of socket and socketpair and
  63      used for the flags parameter of accept4.  */
  64
  65   SOCK_CLOEXEC = 0x10000000,    /* Atomically set close-on-exec flag for the
  66                                    new descriptor(s).  */
  67 #define SOCK_CLOEXEC SOCK_CLOEXEC
  68
  69   SOCK_NONBLOCK = 0x20000000    /* Atomically mark descriptor(s) as
  70                                    non-blocking.  */
  71 #define SOCK_NONBLOCK SOCK_NONBLOCK
  72 };
  73
  74 /* Protocol families.  */
  75 #define PF_UNSPEC       0       /* Unspecified.  */
  76 #define PF_LOCAL        1       /* Local to host (pipes and file-domain).  */
  77 #define PF_UNIX         PF_LOCAL /* Old BSD name for PF_LOCAL.  */
  78 #define PF_FILE         PF_LOCAL /* POSIX name for PF_LOCAL.  */
  79 #define PF_INET         2       /* IP protocol family.  */
  80 #define PF_IMPLINK      3       /* ARPAnet IMP protocol.  */
  81 #define PF_PUP          4       /* PUP protocols.  */
  82 #define PF_CHAOS        5       /* MIT Chaos protocols.  */
  83 #define PF_NS           6       /* Xerox NS protocols.  */
  84 #define PF_ISO          7       /* ISO protocols.  */
  85 #define PF_OSI          PF_ISO
  86 #define PF_ECMA         8       /* ECMA protocols.  */
  87 #define PF_DATAKIT      9       /* AT&T Datakit protocols.  */
  88 #define PF_CCITT        10      /* CCITT protocols (X.25 et al).  */
  89 #define PF_SNA          11      /* IBM SNA protocol.  */
  90 #define PF_DECnet       12      /* DECnet protocols.  */
  91 #define PF_DLI          13      /* Direct data link interface.  */
  92 #define PF_LAT          14      /* DEC Local Area Transport protocol.  */
  93 #define PF_HYLINK       15      /* NSC Hyperchannel protocol.  */
  94 #define PF_APPLETALK    16      /* Don't use this.  */
  95 #define PF_ROUTE        17      /* Internal Routing Protocol.  */
  96 #define PF_LINK         18      /* Link layer interface.  */
  97 #define PF_XTP          19      /* eXpress Transfer Protocol (no AF).  */
  98 #define PF_COIP         20      /* Connection-oriented IP, aka ST II.  */
  99 #define PF_CNT          21      /* Computer Network Technology.  */
 100 #define PF_RTIP         22      /* Help Identify RTIP packets.  **/
 101 #define PF_IPX          23      /* Novell Internet Protocol.  */
 102 #define PF_SIP          24      /* Simple Internet Protocol.  */
 103 #define PF_PIP          25      /* Help Identify PIP packets.  */
 104 #define PF_INET6        26      /* IP version 6.  */
 105 #define PF_MAX          27
 106
 107 /* Address families.  */
 108 #define AF_UNSPEC       PF_UNSPEC
 109 #define AF_LOCAL        PF_LOCAL
 110 #define AF_UNIX         PF_UNIX
 111 #define AF_FILE         PF_FILE
 112 #define AF_INET         PF_INET
 113 #define AF_IMPLINK      PF_IMPLINK
 114 #define AF_PUP          PF_PUP
 115 #define AF_CHAOS        PF_CHAOS
 116 #define AF_NS           PF_NS
 117 #define AF_ISO          PF_ISO
 118 #define AF_OSI          PF_OSI
 119 #define AF_ECMA         PF_ECMA
 120 #define AF_DATAKIT      PF_DATAKIT
 121 #define AF_CCITT        PF_CCITT
 122 #define AF_SNA          PF_SNA
 123 #define AF_DECnet       PF_DECnet
 124 #define AF_DLI          PF_DLI
 125 #define AF_LAT          PF_LAT
 126 #define AF_HYLINK       PF_HYLINK
 127 #define AF_APPLETALK    PF_APPLETALK
 128 #define AF_ROUTE        PF_ROUTE
 129 #define AF_LINK         PF_LINK
 130 #define pseudo_AF_XTP   PF_XTP
 131 #define AF_COIP         PF_COIP
 132 #define AF_CNT          PF_CNT
 133 #define pseudo_AF_RTIP  PF_RTIP
 134 #define AF_IPX          PF_IPX
 135 #define AF_SIP          PF_SIP
 136 #define pseudo_AF_PIP   PF_PIP
 137 #define AF_INET6        PF_INET6
 138 #define AF_MAX          PF_MAX
 139
 140 /* Maximum queue length specifiable by listen.  */
 141 #define SOMAXCONN       128     /* 5 on the origional 4.4 BSD.  */
 142
 143 /* Get the definition of the macro to define the common sockaddr members.  */
 144 #include <bits/sockaddr.h>
 145
 146 /* Structure describing a generic socket address.  */
 147 struct sockaddr
 148   {
 149     __SOCKADDR_COMMON (sa_);    /* Common data: address family and length.  */
 150     char sa_data[14];           /* Address data.  */
 151   };
 152
 153
 154 /* Structure large enough to hold any socket address (with the historical
 155    exception of AF_UNIX).  */
 156 #if ULONG_MAX > 0xffffffff
 157 # define __ss_aligntype __uint64_t
 158 #else
 159 # define __ss_aligntype __uint32_t
 160 #endif
 161 #define _SS_PADSIZE \
 162   (_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
 163
 164 struct sockaddr_storage
 165   {
 166     __SOCKADDR_COMMON (ss_);    /* Address family, etc.  */
 167     char __ss_padding[_SS_PADSIZE];
 168     __ss_aligntype __ss_align;  /* Force desired alignment.  */
 169   };
 170
 171
 172 /* Bits in the FLAGS argument to `send', `recv', et al.  */
 173 enum
 174   {
 175     MSG_OOB             = 0x01, /* Process out-of-band data.  */
 176 #define MSG_OOB MSG_OOB
 177     MSG_PEEK            = 0x02, /* Peek at incoming messages.  */
 178 #define MSG_PEEK MSG_PEEK
 179     MSG_DONTROUTE       = 0x04, /* Don't use local routing.  */
 180 #define MSG_DONTROUTE MSG_DONTROUTE
 181     MSG_EOR             = 0x08, /* Data completes record.  */
 182 #define MSG_EOR MSG_EOR
 183     MSG_TRUNC           = 0x10, /* Data discarded before delivery.  */
 184 #define MSG_TRUNC MSG_TRUNC
 185     MSG_CTRUNC          = 0x20, /* Control data lost before delivery.  */
 186 #define MSG_CTRUNC MSG_CTRUNC
 187     MSG_WAITALL         = 0x40, /* Wait for full request or error.  */
 188 #define MSG_WAITALL MSG_WAITALL
 189     MSG_DONTWAIT        = 0x80, /* This message should be nonblocking.  */
 190 #define MSG_DONTWAIT MSG_DONTWAIT
 191     MSG_NOSIGNAL        = 0x0400        /* Do not generate SIGPIPE on EPIPE.  */
 192 #define MSG_NOSIGNAL MSG_NOSIGNAL
 193   };
 194
 195
 196 /* Structure describing messages sent by
 197    `sendmsg' and received by `recvmsg'.  */
 198 struct msghdr
 199   {
 200     void *msg_name;             /* Address to send to/receive from.  */
 201     socklen_t msg_namelen;      /* Length of address data.  */
 202
 203     struct iovec *msg_iov;      /* Vector of data to send/receive into.  */
 204     int msg_iovlen;             /* Number of elements in the vector.  */
 205
 206     void *msg_control;          /* Ancillary data (eg BSD filedesc passing). */
 207     socklen_t msg_controllen;   /* Ancillary data buffer length.  */
 208
 209     int msg_flags;              /* Flags in received message.  */
 210   };
 211
 212 /* Structure used for storage of ancillary data object information.  */
 213 struct cmsghdr
 214   {
 215     socklen_t cmsg_len;         /* Length of data in cmsg_data plus length
 216                                    of cmsghdr structure.  */
 217     int cmsg_level;             /* Originating protocol.  */
 218     int cmsg_type;              /* Protocol specific type.  */
 219 #if __glibc_c99_flexarr_available
 220     __extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data.  */
 221 #endif
 222   };
 223
 224 /* Ancillary data object manipulation macros.  */
 225 #if __glibc_c99_flexarr_available
 226 # define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
 227 #else
 228 # define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
 229 #endif
 230
 231 #define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
 232
 233 #define CMSG_FIRSTHDR(mhdr) \
 234   ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr)                 \
 235    ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
 236
 237 #define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
 238                            & (size_t) ~(sizeof (size_t) - 1))
 239 #define CMSG_SPACE(len) (CMSG_ALIGN (len) \
 240                          + CMSG_ALIGN (sizeof (struct cmsghdr)))
 241 #define CMSG_LEN(len)   (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
 242
 243 extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr,
 244                                       struct cmsghdr *__cmsg) __THROW;
 245 #ifdef __USE_EXTERN_INLINES
 246 # ifndef _EXTERN_INLINE
 247 #  define _EXTERN_INLINE __extern_inline
 248 # endif
 249 _EXTERN_INLINE struct cmsghdr *
 250 __NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg))
 251 {
 252   if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
 253     /* The kernel header does this so there may be a reason.  */
 254     return NULL;
 255
 256   __cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
 257                                + CMSG_ALIGN (__cmsg->cmsg_len));
 258   if ((unsigned char *) (__cmsg + 1) > ((unsigned char *) __mhdr->msg_control
 259                                         + __mhdr->msg_controllen)
 260       || ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
 261           > ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
 262     /* No more entries.  */
 263     return NULL;
 264   return __cmsg;
 265 }
 266 #endif  /* Use `extern inline'.  */
 267
 268 /* Socket level message types.  */
 269 enum
 270   {
 271     SCM_RIGHTS = 0x01,          /* Access rights (array of int).  */
 272 #define SCM_RIGHTS SCM_RIGHTS
 273     SCM_TIMESTAMP = 0x02,       /* Timestamp (struct timeval).  */
 274 #define SCM_TIMESTAMP SCM_TIMESTAMP
 275     SCM_CREDS = 0x03            /* Process creds (struct cmsgcred).  */
 276 #define SCM_CREDS SCM_CREDS
 277   };
 278
 279 /* Unfortunately, BSD practice dictates this structure be of fixed size.
 280    If there are more than CMGROUP_MAX groups, the list is truncated.
 281    (On GNU systems, the `cmcred_euid' field is just the first in the
 282    list of effective UIDs.)  */
 283 #define CMGROUP_MAX     16
 284
 285 /* Structure delivered by SCM_CREDS.  This describes the identity of the
 286    sender of the data simultaneously received on the socket.  By BSD
 287    convention, this is included only when a sender on a AF_LOCAL socket
 288    sends cmsg data of this type and size; the sender's structure is
 289    ignored, and the system fills in the various IDs of the sender process.  */
 290 struct cmsgcred
 291   {
 292     __pid_t cmcred_pid;
 293     __uid_t cmcred_uid;
 294     __uid_t cmcred_euid;
 295     __gid_t cmcred_gid;
 296     int cmcred_ngroups;
 297     __gid_t cmcred_groups[CMGROUP_MAX];
 298   };
 299
 300 /* Protocol number used to manipulate socket-level options
 301    with `getsockopt' and `setsockopt'.  */
 302 #define SOL_SOCKET      0xffff
 303
 304 /* Socket-level options for `getsockopt' and `setsockopt'.  */
 305 enum
 306   {
 307     SO_DEBUG = 0x0001,          /* Record debugging information.  */
 308 #define SO_DEBUG SO_DEBUG
 309     SO_ACCEPTCONN = 0x0002,     /* Accept connections on socket.  */
 310 #define SO_ACCEPTCONN SO_ACCEPTCONN
 311     SO_REUSEADDR = 0x0004,      /* Allow reuse of local addresses.  */
 312 #define SO_REUSEADDR SO_REUSEADDR
 313     SO_KEEPALIVE = 0x0008,      /* Keep connections alive and send
 314                                    SIGPIPE when they die.  */
 315 #define SO_KEEPALIVE SO_KEEPALIVE
 316     SO_DONTROUTE = 0x0010,      /* Don't do local routing.  */
 317 #define SO_DONTROUTE SO_DONTROUTE
 318     SO_BROADCAST = 0x0020,      /* Allow transmission of
 319                                    broadcast messages.  */
 320 #define SO_BROADCAST SO_BROADCAST
 321     SO_USELOOPBACK = 0x0040,    /* Use the software loopback to avoid
 322                                    hardware use when possible.  */
 323 #define SO_USELOOPBACK SO_USELOOPBACK
 324     SO_LINGER = 0x0080,         /* Block on close of a reliable
 325                                    socket to transmit pending data.  */
 326 #define SO_LINGER SO_LINGER
 327     SO_OOBINLINE = 0x0100,      /* Receive out-of-band data in-band.  */
 328 #define SO_OOBINLINE SO_OOBINLINE
 329     SO_REUSEPORT = 0x0200,      /* Allow local address and port reuse.  */
 330 #define SO_REUSEPORT SO_REUSEPORT
 331     SO_SNDBUF = 0x1001,         /* Send buffer size.  */
 332 #define SO_SNDBUF SO_SNDBUF
 333     SO_RCVBUF = 0x1002,         /* Receive buffer.  */
 334 #define SO_RCVBUF SO_RCVBUF
 335     SO_SNDLOWAT = 0x1003,       /* Send low-water mark.  */
 336 #define SO_SNDLOWAT SO_SNDLOWAT
 337     SO_RCVLOWAT = 0x1004,       /* Receive low-water mark.  */
 338 #define SO_RCVLOWAT SO_RCVLOWAT
 339     SO_SNDTIMEO = 0x1005,       /* Send timeout.  */
 340 #define SO_SNDTIMEO SO_SNDTIMEO
 341     SO_RCVTIMEO = 0x1006,       /* Receive timeout.  */
 342 #define SO_RCVTIMEO SO_RCVTIMEO
 343     SO_ERROR = 0x1007,          /* Get and clear error status.  */
 344 #define SO_ERROR SO_ERROR
 345     SO_STYLE = 0x1008,          /* Get socket connection style.  */
 346 #define SO_STYLE SO_STYLE
 347     SO_TYPE = SO_STYLE          /* Compatible name for SO_STYLE.  */
 348 #define SO_TYPE SO_TYPE
 349   };
 350
 351 /* Structure used to manipulate the SO_LINGER option.  */
 352 struct linger
 353   {
 354     int l_onoff;                /* Nonzero to linger on close.  */
 355     int l_linger;               /* Time to linger.  */
 356   };
 357
 358 #endif  /* bits/socket.h */