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glibc/bits/socket.h
Florian Weimer 3375cfafa7 Make padding in struct sockaddr_storage explicit [BZ #20111] 
This avoids aliasing issues with GCC 6 in -fno-strict-aliasing
mode.  (With implicit padding, not all data is copied.)

This change makes it explicit that struct sockaddr_storage is
only 126 bytes large on m68k (unlike elsewhere, where we end up
with the requested 128 bytes).  The new test case makes sure that
this does not happen on other architectures.
2016-05-23 19:43:09 +02:00

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/* System-specific socket constants and types. 4.4 BSD version.
Copyright (C) 1991-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#ifndef __BITS_SOCKET_H
#define __BITS_SOCKET_H 1
#ifndef _SYS_SOCKET_H
# error "Never include <bits/socket.h> directly; use <sys/socket.h> instead."
#endif
#define __need_size_t
#define __need_NULL
#include <stddef.h>
#include <limits.h> /* XXX Is this allowed? */
#include <bits/types.h>
/* Type for length arguments in socket calls. */
#ifndef __socklen_t_defined
typedef __socklen_t socklen_t;
# define __socklen_t_defined
#endif
/* Types of sockets. */
enum __socket_type
{
SOCK_STREAM = 1, /* Sequenced, reliable, connection-based
byte streams. */
#define SOCK_STREAM SOCK_STREAM
SOCK_DGRAM = 2, /* Connectionless, unreliable datagrams
of fixed maximum length. */
#define SOCK_DGRAM SOCK_DGRAM
SOCK_RAW = 3, /* Raw protocol interface. */
#define SOCK_RAW SOCK_RAW
SOCK_RDM = 4, /* Reliably-delivered messages. */
#define SOCK_RDM SOCK_RDM
SOCK_SEQPACKET = 5, /* Sequenced, reliable, connection-based,
datagrams of fixed maximum length. */
#define SOCK_SEQPACKET SOCK_SEQPACKET
#define SOCK_MAX (SOCK_SEQPACKET + 1)
/* Mask which covers at least up to SOCK_MASK-1.
The remaining bits are used as flags. */
#define SOCK_TYPE_MASK 0xf
/* Flags to be ORed into the type parameter of socket and socketpair and
used for the flags parameter of accept4. */
SOCK_CLOEXEC = 0x10000000, /* Atomically set close-on-exec flag for the
new descriptor(s). */
#define SOCK_CLOEXEC SOCK_CLOEXEC
SOCK_NONBLOCK = 0x20000000 /* Atomically mark descriptor(s) as
non-blocking. */
#define SOCK_NONBLOCK SOCK_NONBLOCK
};
/* Protocol families. */
#define PF_UNSPEC 0 /* Unspecified. */
#define PF_LOCAL 1 /* Local to host (pipes and file-domain). */
#define PF_UNIX PF_LOCAL /* Old BSD name for PF_LOCAL. */
#define PF_FILE PF_LOCAL /* POSIX name for PF_LOCAL. */
#define PF_INET 2 /* IP protocol family. */
#define PF_IMPLINK 3 /* ARPAnet IMP protocol. */
#define PF_PUP 4 /* PUP protocols. */
#define PF_CHAOS 5 /* MIT Chaos protocols. */
#define PF_NS 6 /* Xerox NS protocols. */
#define PF_ISO 7 /* ISO protocols. */
#define PF_OSI PF_ISO
#define PF_ECMA 8 /* ECMA protocols. */
#define PF_DATAKIT 9 /* AT&T Datakit protocols. */
#define PF_CCITT 10 /* CCITT protocols (X.25 et al). */
#define PF_SNA 11 /* IBM SNA protocol. */
#define PF_DECnet 12 /* DECnet protocols. */
#define PF_DLI 13 /* Direct data link interface. */
#define PF_LAT 14 /* DEC Local Area Transport protocol. */
#define PF_HYLINK 15 /* NSC Hyperchannel protocol. */
#define PF_APPLETALK 16 /* Don't use this. */
#define PF_ROUTE 17 /* Internal Routing Protocol. */
#define PF_LINK 18 /* Link layer interface. */
#define PF_XTP 19 /* eXpress Transfer Protocol (no AF). */
#define PF_COIP 20 /* Connection-oriented IP, aka ST II. */
#define PF_CNT 21 /* Computer Network Technology. */
#define PF_RTIP 22 /* Help Identify RTIP packets. **/
#define PF_IPX 23 /* Novell Internet Protocol. */
#define PF_SIP 24 /* Simple Internet Protocol. */
#define PF_PIP 25 /* Help Identify PIP packets. */
#define PF_INET6 26 /* IP version 6. */
#define PF_MAX 27
/* Address families. */
#define AF_UNSPEC PF_UNSPEC
#define AF_LOCAL PF_LOCAL
#define AF_UNIX PF_UNIX
#define AF_FILE PF_FILE
#define AF_INET PF_INET
#define AF_IMPLINK PF_IMPLINK
#define AF_PUP PF_PUP
#define AF_CHAOS PF_CHAOS
#define AF_NS PF_NS
#define AF_ISO PF_ISO
#define AF_OSI PF_OSI
#define AF_ECMA PF_ECMA
#define AF_DATAKIT PF_DATAKIT
#define AF_CCITT PF_CCITT
#define AF_SNA PF_SNA
#define AF_DECnet PF_DECnet
#define AF_DLI PF_DLI
#define AF_LAT PF_LAT
#define AF_HYLINK PF_HYLINK
#define AF_APPLETALK PF_APPLETALK
#define AF_ROUTE PF_ROUTE
#define AF_LINK PF_LINK
#define pseudo_AF_XTP PF_XTP
#define AF_COIP PF_COIP
#define AF_CNT PF_CNT
#define pseudo_AF_RTIP PF_RTIP
#define AF_IPX PF_IPX
#define AF_SIP PF_SIP
#define pseudo_AF_PIP PF_PIP
#define AF_INET6 PF_INET6
#define AF_MAX PF_MAX
/* Maximum queue length specifiable by listen. */
#define SOMAXCONN 128 /* 5 on the origional 4.4 BSD. */
/* Get the definition of the macro to define the common sockaddr members. */
#include <bits/sockaddr.h>
/* Structure describing a generic socket address. */
struct sockaddr
{
__SOCKADDR_COMMON (sa_); /* Common data: address family and length. */
char sa_data[14]; /* Address data. */
};
/* Structure large enough to hold any socket address (with the historical
exception of AF_UNIX). */
#if ULONG_MAX > 0xffffffff
# define __ss_aligntype __uint64_t
#else
# define __ss_aligntype __uint32_t
#endif
#define _SS_PADSIZE \
(_SS_SIZE - __SOCKADDR_COMMON_SIZE - sizeof (__ss_aligntype))
struct sockaddr_storage
{
__SOCKADDR_COMMON (ss_); /* Address family, etc. */
char __ss_padding[_SS_PADSIZE];
__ss_aligntype __ss_align; /* Force desired alignment. */
};
/* Bits in the FLAGS argument to `send', `recv', et al. */
enum
{
MSG_OOB = 0x01, /* Process out-of-band data. */
#define MSG_OOB MSG_OOB
MSG_PEEK = 0x02, /* Peek at incoming messages. */
#define MSG_PEEK MSG_PEEK
MSG_DONTROUTE = 0x04, /* Don't use local routing. */
#define MSG_DONTROUTE MSG_DONTROUTE
MSG_EOR = 0x08, /* Data completes record. */
#define MSG_EOR MSG_EOR
MSG_TRUNC = 0x10, /* Data discarded before delivery. */
#define MSG_TRUNC MSG_TRUNC
MSG_CTRUNC = 0x20, /* Control data lost before delivery. */
#define MSG_CTRUNC MSG_CTRUNC
MSG_WAITALL = 0x40, /* Wait for full request or error. */
#define MSG_WAITALL MSG_WAITALL
MSG_DONTWAIT = 0x80, /* This message should be nonblocking. */
#define MSG_DONTWAIT MSG_DONTWAIT
MSG_NOSIGNAL = 0x0400 /* Do not generate SIGPIPE on EPIPE. */
#define MSG_NOSIGNAL MSG_NOSIGNAL
};
/* Structure describing messages sent by
`sendmsg' and received by `recvmsg'. */
struct msghdr
{
void *msg_name; /* Address to send to/receive from. */
socklen_t msg_namelen; /* Length of address data. */
struct iovec *msg_iov; /* Vector of data to send/receive into. */
int msg_iovlen; /* Number of elements in the vector. */
void *msg_control; /* Ancillary data (eg BSD filedesc passing). */
socklen_t msg_controllen; /* Ancillary data buffer length. */
int msg_flags; /* Flags in received message. */
};
/* Structure used for storage of ancillary data object information. */
struct cmsghdr
{
socklen_t cmsg_len; /* Length of data in cmsg_data plus length
of cmsghdr structure. */
int cmsg_level; /* Originating protocol. */
int cmsg_type; /* Protocol specific type. */
#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
__extension__ unsigned char __cmsg_data __flexarr; /* Ancillary data. */
#endif
};
/* Ancillary data object manipulation macros. */
#if (!defined __STRICT_ANSI__ && __GNUC__ >= 2) || __STDC_VERSION__ >= 199901L
# define CMSG_DATA(cmsg) ((cmsg)->__cmsg_data)
#else
# define CMSG_DATA(cmsg) ((unsigned char *) ((struct cmsghdr *) (cmsg) + 1))
#endif
#define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
#define CMSG_FIRSTHDR(mhdr) \
((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr) \
? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
#define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
& (size_t) ~(sizeof (size_t) - 1))
#define CMSG_SPACE(len) (CMSG_ALIGN (len) \
+ CMSG_ALIGN (sizeof (struct cmsghdr)))
#define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr,
struct cmsghdr *__cmsg) __THROW;
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
# define _EXTERN_INLINE __extern_inline
# endif
_EXTERN_INLINE struct cmsghdr *
__NTH (__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg))
{
if ((size_t) __cmsg->cmsg_len < sizeof (struct cmsghdr))
/* The kernel header does this so there may be a reason. */
return NULL;
__cmsg = (struct cmsghdr *) ((unsigned char *) __cmsg
+ CMSG_ALIGN (__cmsg->cmsg_len));
if ((unsigned char *) (__cmsg + 1) > ((unsigned char *) __mhdr->msg_control
+ __mhdr->msg_controllen)
|| ((unsigned char *) __cmsg + CMSG_ALIGN (__cmsg->cmsg_len)
> ((unsigned char *) __mhdr->msg_control + __mhdr->msg_controllen)))
/* No more entries. */
return NULL;
return __cmsg;
}
#endif /* Use `extern inline'. */
/* Socket level message types. */
enum
{
SCM_RIGHTS = 0x01, /* Access rights (array of int). */
#define SCM_RIGHTS SCM_RIGHTS
SCM_TIMESTAMP = 0x02, /* Timestamp (struct timeval). */
#define SCM_TIMESTAMP SCM_TIMESTAMP
SCM_CREDS = 0x03 /* Process creds (struct cmsgcred). */
#define SCM_CREDS SCM_CREDS
};
/* Unfortunately, BSD practice dictates this structure be of fixed size.
If there are more than CMGROUP_MAX groups, the list is truncated.
(On GNU systems, the `cmcred_euid' field is just the first in the
list of effective UIDs.) */
#define CMGROUP_MAX 16
/* Structure delivered by SCM_CREDS. This describes the identity of the
sender of the data simultaneously received on the socket. By BSD
convention, this is included only when a sender on a AF_LOCAL socket
sends cmsg data of this type and size; the sender's structure is
ignored, and the system fills in the various IDs of the sender process. */
struct cmsgcred
{
__pid_t cmcred_pid;
__uid_t cmcred_uid;
__uid_t cmcred_euid;
__gid_t cmcred_gid;
int cmcred_ngroups;
__gid_t cmcred_groups[CMGROUP_MAX];
};
/* Protocol number used to manipulate socket-level options
with `getsockopt' and `setsockopt'. */
#define SOL_SOCKET 0xffff
/* Socket-level options for `getsockopt' and `setsockopt'. */
enum
{
SO_DEBUG = 0x0001, /* Record debugging information. */
#define SO_DEBUG SO_DEBUG
SO_ACCEPTCONN = 0x0002, /* Accept connections on socket. */
#define SO_ACCEPTCONN SO_ACCEPTCONN
SO_REUSEADDR = 0x0004, /* Allow reuse of local addresses. */
#define SO_REUSEADDR SO_REUSEADDR
SO_KEEPALIVE = 0x0008, /* Keep connections alive and send
SIGPIPE when they die. */
#define SO_KEEPALIVE SO_KEEPALIVE
SO_DONTROUTE = 0x0010, /* Don't do local routing. */
#define SO_DONTROUTE SO_DONTROUTE
SO_BROADCAST = 0x0020, /* Allow transmission of
broadcast messages. */
#define SO_BROADCAST SO_BROADCAST
SO_USELOOPBACK = 0x0040, /* Use the software loopback to avoid
hardware use when possible. */
#define SO_USELOOPBACK SO_USELOOPBACK
SO_LINGER = 0x0080, /* Block on close of a reliable
socket to transmit pending data. */
#define SO_LINGER SO_LINGER
SO_OOBINLINE = 0x0100, /* Receive out-of-band data in-band. */
#define SO_OOBINLINE SO_OOBINLINE
SO_REUSEPORT = 0x0200, /* Allow local address and port reuse. */
#define SO_REUSEPORT SO_REUSEPORT
SO_SNDBUF = 0x1001, /* Send buffer size. */
#define SO_SNDBUF SO_SNDBUF
SO_RCVBUF = 0x1002, /* Receive buffer. */
#define SO_RCVBUF SO_RCVBUF
SO_SNDLOWAT = 0x1003, /* Send low-water mark. */
#define SO_SNDLOWAT SO_SNDLOWAT
SO_RCVLOWAT = 0x1004, /* Receive low-water mark. */
#define SO_RCVLOWAT SO_RCVLOWAT
SO_SNDTIMEO = 0x1005, /* Send timeout. */
#define SO_SNDTIMEO SO_SNDTIMEO
SO_RCVTIMEO = 0x1006, /* Receive timeout. */
#define SO_RCVTIMEO SO_RCVTIMEO
SO_ERROR = 0x1007, /* Get and clear error status. */
#define SO_ERROR SO_ERROR
SO_STYLE = 0x1008, /* Get socket connection style. */
#define SO_STYLE SO_STYLE
SO_TYPE = SO_STYLE /* Compatible name for SO_STYLE. */
#define SO_TYPE SO_TYPE
};
/* Structure used to manipulate the SO_LINGER option. */
struct linger
{
int l_onoff; /* Nonzero to linger on close. */
int l_linger; /* Time to linger. */
};
#endif /* bits/socket.h */
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