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Revision 1.89, Wed Sep 19 04:33:45 2007 UTC (7 years, 3 months ago) by dyoung
Branch: MAIN
CVS Tags: yamt-x86pmap-base4, yamt-x86pmap-base3, yamt-x86pmap-base2, yamt-x86pmap-base, yamt-x86pmap, yamt-pf42-baseX, yamt-pf42-base3, yamt-pf42-base2, yamt-pf42-base, yamt-nfs-mp-base2, yamt-nfs-mp-base, yamt-lazymbuf-base15, yamt-lazymbuf-base14, yamt-kmem-base3, yamt-kmem-base2, yamt-kmem-base, yamt-kmem, vmlocking2-base3, vmlocking2-base2, vmlocking2-base1, vmlocking2, vmlocking-nbase, vmlocking-base, reinoud-bufcleanup-nbase, reinoud-bufcleanup-base, nick-net80211-sync-base, nick-net80211-sync, mjf-devfs-base, mjf-devfs, matt-armv6-nbase, matt-armv6-base, keiichi-mipv6-nbase, keiichi-mipv6-base, jmcneill-pm-base, jmcneill-base, hpcarm-cleanup-nbase, hpcarm-cleanup-base, cube-autoconf-base, cube-autoconf, bouyer-xeni386-nbase, bouyer-xeni386-merge1, bouyer-xeni386-base, bouyer-xeni386, bouyer-xenamd64-base2, bouyer-xenamd64-base, bouyer-xenamd64, ad-socklock-base1
Branch point for: yamt-pf42, yamt-nfs-mp, wrstuden-revivesa, simonb-wapbl, mjf-devfs2, keiichi-mipv6, christos-time_t
Changes since 1.88: +17 -1 lines

1) Introduce a new socket option, (SOL_SOCKET, SO_NOHEADER), that
   tells a socket that it should both add a protocol header to tx'd
   datagrams and remove the header from rx'd datagrams:

        int onoff = 1, s = socket(...);
        setsockopt(s, SOL_SOCKET, SO_NOHEADER, &onoff);

2) Add an implementation of (SOL_SOCKET, SO_NOHEADER) for raw IPv4
   sockets.

3) Reorganize the protocols' pr_ctloutput implementations a bit.
   Consistently return ENOPROTOOPT when an option is unsupported,
   and EINVAL if a supported option's arguments are incorrect.
   Reorganize the flow of code so that it's more clear how/when
   options are passed down the stack until they are handled.

   Shorten some pr_ctloutput staircases for readability.

4) Extract common mbuf code into subroutines, add new sockaddr
   methods, and introduce a new subroutine, fsocreate(), for reuse
   later; use it first in sys_socket():

struct mbuf *m_getsombuf(struct socket *so)

        Create an mbuf and make its owner the socket `so'.

struct mbuf *m_intopt(struct socket *so, int val)

        Create an mbuf, make its owner the socket `so', put the
        int `val' into it, and set its length to sizeof(int).


int fsocreate(..., int *fd)

        Create a socket, a la socreate(9), put the socket into the
        given LWP's descriptor table, return the descriptor at `fd'
        on success.

void *sockaddr_addr(struct sockaddr *sa, socklen_t *slenp)
const void *sockaddr_const_addr(const struct sockaddr *sa, socklen_t *slenp)

        Extract a pointer to the address part of a sockaddr.  Write
        the length of the address  part at `slenp', if `slenp' is
        not NULL.

socklen_t sockaddr_getlen(const struct sockaddr *sa)

        Return the length of a sockaddr.  This just evaluates to
        sa->sa_len.  I only add this for consistency with code that
        appears in a portable userland library that I am going to
        import.

const struct sockaddr *sockaddr_any(const struct sockaddr *sa)

        Return the "don't care" sockaddr in the same family as
        `sa'.  This is the address a client should sobind(9) if it
        does not care the source address and, if applicable, the
        port et cetera that it uses.

const void *sockaddr_anyaddr(const struct sockaddr *sa, socklen_t *slenp)

        Return the "don't care" sockaddr in the same family as
        `sa'.  This is the address a client should sobind(9) if it
        does not care the source address and, if applicable, the
        port et cetera that it uses.

/*	$NetBSD: socket.h,v 1.89 2007/09/19 04:33:45 dyoung Exp $	*/

/*
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1982, 1985, 1986, 1988, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)socket.h	8.6 (Berkeley) 5/3/95
 */

#ifndef _SYS_SOCKET_H_
#define	_SYS_SOCKET_H_

#include <sys/featuretest.h>

/*
 * Definitions related to sockets: types, address families, options.
 */

/*
 * Data types.
 */
#include <sys/ansi.h>

#ifndef sa_family_t
typedef __sa_family_t	sa_family_t;
#define sa_family_t	__sa_family_t
#endif

#ifndef socklen_t
typedef __socklen_t	socklen_t;
#define socklen_t	__socklen_t
#endif

#include <machine/ansi.h>

#ifdef	_BSD_SIZE_T_
typedef	_BSD_SIZE_T_	size_t;
#undef	_BSD_SIZE_T_
#endif

#ifdef	_BSD_SSIZE_T_
typedef	_BSD_SSIZE_T_	ssize_t;
#undef	_BSD_SSIZE_T_
#endif

#include <sys/uio.h>

/*
 * Socket types.
 */
#define	SOCK_STREAM	1		/* stream socket */
#define	SOCK_DGRAM	2		/* datagram socket */
#define	SOCK_RAW	3		/* raw-protocol interface */
#define	SOCK_RDM	4		/* reliably-delivered message */
#define	SOCK_SEQPACKET	5		/* sequenced packet stream */

/*
 * Option flags per-socket.
 */
#define	SO_DEBUG	0x0001		/* turn on debugging info recording */
#define	SO_ACCEPTCONN	0x0002		/* socket has had listen() */
#define	SO_REUSEADDR	0x0004		/* allow local address reuse */
#define	SO_KEEPALIVE	0x0008		/* keep connections alive */
#define	SO_DONTROUTE	0x0010		/* just use interface addresses */
#define	SO_BROADCAST	0x0020		/* permit sending of broadcast msgs */
#define	SO_USELOOPBACK	0x0040		/* bypass hardware when possible */
#define	SO_LINGER	0x0080		/* linger on close if data present */
#define	SO_OOBINLINE	0x0100		/* leave received OOB data in line */
#define	SO_REUSEPORT	0x0200		/* allow local address & port reuse */
#define	SO_TIMESTAMP	0x0400		/* timestamp received dgram traffic */


/*
 * Additional options, not kept in so_options.
 */
#define SO_SNDBUF	0x1001		/* send buffer size */
#define SO_RCVBUF	0x1002		/* receive buffer size */
#define SO_SNDLOWAT	0x1003		/* send low-water mark */
#define SO_RCVLOWAT	0x1004		/* receive low-water mark */
#define SO_SNDTIMEO	0x1005		/* send timeout */
#define SO_RCVTIMEO	0x1006		/* receive timeout */
#define	SO_ERROR	0x1007		/* get error status and clear */
#define	SO_TYPE		0x1008		/* get socket type */
#define	SO_OVERFLOWED	0x1009		/* datagrams: return packets dropped */

#define	SO_NOHEADER	0x100a		/* user supplies no header to kernel;
					 * kernel removes header and supplies
					 * payload
					 */
/*
 * Structure used for manipulating linger option.
 */
struct	linger {
	int	l_onoff;		/* option on/off */
	int	l_linger;		/* linger time in seconds */
};

/*
 * Level number for (get/set)sockopt() to apply to socket itself.
 */
#define	SOL_SOCKET	0xffff		/* options for socket level */

/*
 * Address families.
 */
#define	AF_UNSPEC	0		/* unspecified */
#define	AF_LOCAL	1		/* local to host (pipes, portals) */
#define	AF_UNIX		AF_LOCAL	/* backward compatibility */
#define	AF_INET		2		/* internetwork: UDP, TCP, etc. */
#define	AF_IMPLINK	3		/* arpanet imp addresses */
#define	AF_PUP		4		/* pup protocols: e.g. BSP */
#define	AF_CHAOS	5		/* mit CHAOS protocols */
#define	AF_NS		6		/* XEROX NS protocols */
#define	AF_ISO		7		/* ISO protocols */
#define	AF_OSI		AF_ISO
#define	AF_ECMA		8		/* european computer manufacturers */
#define	AF_DATAKIT	9		/* datakit protocols */
#define	AF_CCITT	10		/* CCITT protocols, X.25 etc */
#define	AF_SNA		11		/* IBM SNA */
#define AF_DECnet	12		/* DECnet */
#define AF_DLI		13		/* DEC Direct data link interface */
#define AF_LAT		14		/* LAT */
#define	AF_HYLINK	15		/* NSC Hyperchannel */
#define	AF_APPLETALK	16		/* Apple Talk */
#define	AF_ROUTE	17		/* Internal Routing Protocol */
#define	AF_LINK		18		/* Link layer interface */
#if defined(_NETBSD_SOURCE)
#define	pseudo_AF_XTP	19		/* eXpress Transfer Protocol (no AF) */
#endif
#define	AF_COIP		20		/* connection-oriented IP, aka ST II */
#define	AF_CNT		21		/* Computer Network Technology */
#if defined(_NETBSD_SOURCE)
#define pseudo_AF_RTIP	22		/* Help Identify RTIP packets */
#endif
#define	AF_IPX		23		/* Novell Internet Protocol */
#define	AF_INET6	24		/* IP version 6 */
#if defined(_NETBSD_SOURCE)
#define pseudo_AF_PIP	25		/* Help Identify PIP packets */
#endif
#define AF_ISDN		26		/* Integrated Services Digital Network*/
#define AF_E164		AF_ISDN		/* CCITT E.164 recommendation */
#define AF_NATM		27		/* native ATM access */
#define AF_ARP		28		/* (rev.) addr. res. prot. (RFC 826) */
#if defined(_NETBSD_SOURCE)
#define pseudo_AF_KEY	29		/* Internal key management protocol  */
#define	pseudo_AF_HDRCMPLT 30		/* Used by BPF to not rewrite hdrs
					   in interface output routine */
#endif
#define AF_BLUETOOTH	31		/* Bluetooth: HCI, SCO, L2CAP, RFCOMM */

#define	AF_MAX		32

/*
 * Structure used by kernel to store most
 * addresses.
 */
struct sockaddr {
	__uint8_t	sa_len;		/* total length */
	sa_family_t	sa_family;	/* address family */
	char		sa_data[14];	/* actually longer; address value */
};

#if defined(_KERNEL)
/*
 * Structure used by kernel to pass protocol
 * information in raw sockets.
 */
struct sockproto {
	u_short	sp_family;		/* address family */
	u_short	sp_protocol;		/* protocol */
};
#endif /* _KERNEL */

#if 1
/*
 * RFC 2553: protocol-independent placeholder for socket addresses
 */
#define _SS_MAXSIZE	128
#define _SS_ALIGNSIZE	(sizeof(__int64_t))
#define _SS_PAD1SIZE	(_SS_ALIGNSIZE - 2)
#define _SS_PAD2SIZE	(_SS_MAXSIZE - 2 - \
				_SS_PAD1SIZE - _SS_ALIGNSIZE)

#if (_XOPEN_SOURCE - 0) >= 500 || defined(_NETBSD_SOURCE)
struct sockaddr_storage {
	__uint8_t	ss_len;		/* address length */
	sa_family_t	ss_family;	/* address family */
	char		__ss_pad1[_SS_PAD1SIZE];
	__int64_t     __ss_align;/* force desired structure storage alignment */
	char		__ss_pad2[_SS_PAD2SIZE];
};
#define	sstosa(__ss)	((struct sockaddr *)(__ss))
#define	sstocsa(__ss)	((const struct sockaddr *)(__ss))
#endif /* _XOPEN_SOURCE >= 500 || _NETBSD_SOURCE */
#endif /* 1 */

/*
 * Protocol families, same as address families for now.
 */
#define	PF_UNSPEC	AF_UNSPEC
#define	PF_LOCAL	AF_LOCAL
#define	PF_UNIX		PF_LOCAL	/* backward compatibility */
#define	PF_INET		AF_INET
#define	PF_IMPLINK	AF_IMPLINK
#define	PF_PUP		AF_PUP
#define	PF_CHAOS	AF_CHAOS
#define	PF_NS		AF_NS
#define	PF_ISO		AF_ISO
#define	PF_OSI		AF_ISO
#define	PF_ECMA		AF_ECMA
#define	PF_DATAKIT	AF_DATAKIT
#define	PF_CCITT	AF_CCITT
#define	PF_SNA		AF_SNA
#define PF_DECnet	AF_DECnet
#define PF_DLI		AF_DLI
#define PF_LAT		AF_LAT
#define	PF_HYLINK	AF_HYLINK
#define	PF_APPLETALK	AF_APPLETALK
#define	PF_ROUTE	AF_ROUTE
#define	PF_LINK		AF_LINK
#if defined(_NETBSD_SOURCE)
#define	PF_XTP		pseudo_AF_XTP	/* really just proto family, no AF */
#endif
#define	PF_COIP		AF_COIP
#define	PF_CNT		AF_CNT
#define	PF_INET6	AF_INET6
#define	PF_IPX		AF_IPX		/* same format as AF_NS */
#if defined(_NETBSD_SOURCE)
#define PF_RTIP		pseudo_AF_RTIP	/* same format as AF_INET */
#define PF_PIP		pseudo_AF_PIP
#endif
#define PF_ISDN		AF_ISDN		/* same as E164 */
#define PF_E164		AF_E164
#define PF_NATM		AF_NATM
#define PF_ARP		AF_ARP
#if defined(_NETBSD_SOURCE)
#define PF_KEY 		pseudo_AF_KEY	/* like PF_ROUTE, only for key mgmt */
#endif
#define PF_BLUETOOTH	AF_BLUETOOTH

#define	PF_MAX		AF_MAX

#if defined(_NETBSD_SOURCE)

#ifndef	gid_t
typedef	__gid_t		gid_t;		/* group id */
#define	gid_t		__gid_t
#endif

#ifndef	uid_t
typedef	__uid_t		uid_t;		/* user id */
#define	uid_t		__uid_t
#endif

/*
 * Socket credentials.
 */
struct sockcred {
	uid_t	sc_uid;			/* real user id */
	uid_t	sc_euid;		/* effective user id */
	gid_t	sc_gid;			/* real group id */
	gid_t	sc_egid;		/* effective group id */
	int	sc_ngroups;		/* number of supplemental groups */
	gid_t	sc_groups[1];		/* variable length */
};

/*
 * Compute size of a sockcred structure with groups.
 */
#define	SOCKCREDSIZE(ngrps) \
	(sizeof(struct sockcred) + (sizeof(gid_t) * ((ngrps) - 1)))
#endif /* _NETBSD_SOURCE */


#if defined(_NETBSD_SOURCE)
/*
 * Definitions for network related sysctl, CTL_NET.
 *
 * Second level is protocol family.
 * Third level is protocol number.
 *
 * Further levels are defined by the individual families below.
 */
#define NET_MAXID	AF_MAX

#define CTL_NET_NAMES { \
	{ 0, 0 }, \
	{ "local", CTLTYPE_NODE }, \
	{ "inet", CTLTYPE_NODE }, \
	{ "implink", CTLTYPE_NODE }, \
	{ "pup", CTLTYPE_NODE }, \
	{ "chaos", CTLTYPE_NODE }, \
	{ "xerox_ns", CTLTYPE_NODE }, \
	{ "iso", CTLTYPE_NODE }, \
	{ "emca", CTLTYPE_NODE }, \
	{ "datakit", CTLTYPE_NODE }, \
	{ "ccitt", CTLTYPE_NODE }, \
	{ "ibm_sna", CTLTYPE_NODE }, \
	{ "decnet", CTLTYPE_NODE }, \
	{ "dec_dli", CTLTYPE_NODE }, \
	{ "lat", CTLTYPE_NODE }, \
	{ "hylink", CTLTYPE_NODE }, \
	{ "appletalk", CTLTYPE_NODE }, \
	{ "route", CTLTYPE_NODE }, \
	{ "link_layer", CTLTYPE_NODE }, \
	{ "xtp", CTLTYPE_NODE }, \
	{ "coip", CTLTYPE_NODE }, \
	{ "cnt", CTLTYPE_NODE }, \
	{ "rtip", CTLTYPE_NODE }, \
	{ "ipx", CTLTYPE_NODE }, \
	{ "inet6", CTLTYPE_NODE }, \
	{ "pip", CTLTYPE_NODE }, \
	{ "isdn", CTLTYPE_NODE }, \
	{ "natm", CTLTYPE_NODE }, \
	{ "arp", CTLTYPE_NODE }, \
	{ "key", CTLTYPE_NODE }, \
}

struct kinfo_pcb {
	__uint64_t	ki_pcbaddr;	/* PTR: pcb addr */
	__uint64_t	ki_ppcbaddr;	/* PTR: ppcb addr */
	__uint64_t	ki_sockaddr;	/* PTR: socket addr */

	__uint32_t	ki_family;	/* INT: protocol family */
	__uint32_t	ki_type;	/* INT: socket type */
	__uint32_t	ki_protocol;	/* INT: protocol */
	__uint32_t	ki_pflags;	/* INT: generic protocol flags */

	__uint32_t	ki_sostate;	/* INT: socket state */
	__uint32_t	ki_prstate;	/* INT: protocol state */
	__int32_t	ki_tstate;	/* INT: tcp state */
	__uint32_t	ki_tflags;	/* INT: tcp flags */

	__uint64_t	ki_rcvq;	/* U_LONG: receive queue len */
	__uint64_t	ki_sndq;	/* U_LONG: send queue len */

	union {
		struct sockaddr	_kis_src; /* STRUCT: local address */
		char _kis_pad[256 + 8];		/* pad to max addr length */
	} ki_s;
	union {
		struct sockaddr	_kid_dst; /* STRUCT: remote address */
		char _kid_pad[256 + 8];		/* pad to max addr length */
	} ki_d;

	__uint64_t	ki_inode;	/* INO_T: fake inode number */
	__uint64_t	ki_vnode;	/* PTR: if associated with file */
	__uint64_t	ki_conn;	/* PTR: control block of peer */
	__uint64_t	ki_refs;	/* PTR: referencing socket */
	__uint64_t	ki_nextref;	/* PTR: link in refs list */
};

#define ki_src ki_s._kis_src
#define ki_dst ki_d._kid_dst

#define PCB_SLOP		20
#define PCB_ALL			0

#endif /* _NETBSD_SOURCE */

#if defined(_NETBSD_SOURCE)
/*
 * PF_ROUTE - Routing table
 *
 * Three additional levels are defined:
 *	Fourth: address family, 0 is wildcard
 *	Fifth: type of info, defined below
 *	Sixth: flag(s) to mask with for NET_RT_FLAGS
 */
#define NET_RT_DUMP	1		/* dump; may limit to a.f. */
#define NET_RT_FLAGS	2		/* by flags, e.g. RESOLVING */
#define NET_RT_OIFLIST	3		/* old NET_RT_IFLIST (pre 1.5) */
#define NET_RT_IFLIST	4		/* survey interface list */
#define	NET_RT_MAXID	5

#define CTL_NET_RT_NAMES { \
	{ 0, 0 }, \
	{ "dump", CTLTYPE_STRUCT }, \
	{ "flags", CTLTYPE_STRUCT }, \
	{ 0, 0 }, \
	{ "iflist", CTLTYPE_STRUCT }, \
}
#endif /* _NETBSD_SOURCE */

/*
 * Maximum queue length specifiable by listen(2).
 */
#ifndef SOMAXCONN
#define	SOMAXCONN	128
#endif

/*
 * Message header for recvmsg and sendmsg calls.
 * Used value-result for recvmsg, value only for sendmsg.
 */
struct msghdr {
	void		*msg_name;	/* optional address */
	socklen_t	msg_namelen;	/* size of address */
	struct iovec	*msg_iov;	/* scatter/gather array */
	int		msg_iovlen;	/* # elements in msg_iov */
	void		*msg_control;	/* ancillary data, see below */
	socklen_t	msg_controllen;	/* ancillary data buffer len */
	int		msg_flags;	/* flags on received message */
};

#define	MSG_OOB		0x0001		/* process out-of-band data */
#define	MSG_PEEK	0x0002		/* peek at incoming message */
#define	MSG_DONTROUTE	0x0004		/* send without using routing tables */
#define	MSG_EOR		0x0008		/* data completes record */
#define	MSG_TRUNC	0x0010		/* data discarded before delivery */
#define	MSG_CTRUNC	0x0020		/* control data lost before delivery */
#define	MSG_WAITALL	0x0040		/* wait for full request or error */
#define	MSG_DONTWAIT	0x0080		/* this message should be nonblocking */
#define	MSG_BCAST	0x0100		/* this message was rcvd using link-level brdcst */
#define	MSG_MCAST	0x0200		/* this message was rcvd using link-level mcast */
#define	MSG_NOSIGNAL	0x0400		/* do not generate SIGPIPE on EOF */

/* Extra flags used internally only */
#define	MSG_USERFLAGS	0x0ffffff
#define MSG_NAMEMBUF	0x1000000	/* msg_name is an mbuf */
#define MSG_CONTROLMBUF	0x2000000	/* msg_control is an mbuf */
#define MSG_IOVUSRSPACE	0x4000000	/* msg_iov is in user space */
#define MSG_LENUSRSPACE	0x8000000	/* address length is in user space */

/*
 * Header for ancillary data objects in msg_control buffer.
 * Used for additional information with/about a datagram
 * not expressible by flags.  The format is a sequence
 * of message elements headed by cmsghdr structures.
 */
struct cmsghdr {
	socklen_t	cmsg_len;	/* data byte count, including hdr */
	int		cmsg_level;	/* originating protocol */
	int		cmsg_type;	/* protocol-specific type */
/* followed by	u_char  cmsg_data[]; */
};

/* given pointer to struct cmsghdr, return pointer to data */
#define	CMSG_DATA(cmsg) \
	((u_char *)(void *)(cmsg) + __CMSG_ALIGN(sizeof(struct cmsghdr)))
#define	CCMSG_DATA(cmsg) \
	((const u_char *)(const void *)(cmsg) + \
	__CMSG_ALIGN(sizeof(struct cmsghdr)))

/*
 * Alignment requirement for CMSG struct manipulation.
 * This basically behaves the same as ALIGN() ARCH/include/param.h.
 * We declare it separately for two reasons:
 * (1) avoid dependency between machine/param.h, and (2) to sync with kernel's
 * idea of ALIGNBYTES at runtime.
 * without (2), we can't guarantee binary compatibility in case of future
 * changes in ALIGNBYTES.
 */
#define __CMSG_ALIGN(n)	(((n) + __cmsg_alignbytes()) & ~__cmsg_alignbytes())
#ifdef _KERNEL
#define CMSG_ALIGN(n)	__CMSG_ALIGN(n)
#endif

/* given pointer to struct cmsghdr, return pointer to next cmsghdr */
#define	CMSG_NXTHDR(mhdr, cmsg)	\
	(((char *)(cmsg) + __CMSG_ALIGN((cmsg)->cmsg_len) + \
			    __CMSG_ALIGN(sizeof(struct cmsghdr)) > \
	    (((char *)(mhdr)->msg_control) + (mhdr)->msg_controllen)) ? \
	    (struct cmsghdr *)0 : \
	    (struct cmsghdr *)((char *)(cmsg) + \
	        __CMSG_ALIGN((cmsg)->cmsg_len)))

/*
 * RFC 2292 requires to check msg_controllen, in case that the kernel returns
 * an empty list for some reasons.
 */
#define	CMSG_FIRSTHDR(mhdr) \
	((mhdr)->msg_controllen >= sizeof(struct cmsghdr) ? \
	 (struct cmsghdr *)(mhdr)->msg_control : \
	 (struct cmsghdr *)0)

#define CMSG_SPACE(l)	(__CMSG_ALIGN(sizeof(struct cmsghdr)) + __CMSG_ALIGN(l))
#define CMSG_LEN(l)	(__CMSG_ALIGN(sizeof(struct cmsghdr)) + (l))

/* "Socket"-level control message types: */
#define	SCM_RIGHTS	0x01		/* access rights (array of int) */
#if defined(_NETBSD_SOURCE)
#define	SCM_TIMESTAMP	0x02		/* timestamp (struct timeval) */
#define	SCM_CREDS	0x04		/* credentials (struct sockcred) */
#endif

/*
 * Types of socket shutdown(2).
 */
#define	SHUT_RD		0		/* Disallow further receives. */
#define	SHUT_WR		1		/* Disallow further sends. */
#define	SHUT_RDWR	2		/* Disallow further sends/receives. */

#include <sys/cdefs.h>

__BEGIN_DECLS
int	__cmsg_alignbytes(void);
__END_DECLS

#ifdef	_KERNEL
static inline socklen_t
sockaddr_getlen(const struct sockaddr *sa)
{
	return sa->sa_len;
}

__BEGIN_DECLS
struct sockaddr *sockaddr_copy(struct sockaddr *, socklen_t,
    const struct sockaddr *);
struct sockaddr *sockaddr_alloc(sa_family_t, socklen_t, int);
const void *sockaddr_const_addr(const struct sockaddr *, socklen_t *);
void *sockaddr_addr(struct sockaddr *, socklen_t *);
const struct sockaddr *sockaddr_any(const struct sockaddr *);
const void *sockaddr_anyaddr(const struct sockaddr *, socklen_t *);
int sockaddr_cmp(const struct sockaddr *, const struct sockaddr *);
struct sockaddr *sockaddr_dup(const struct sockaddr *, int);
void sockaddr_free(struct sockaddr *);
__END_DECLS
#endif /* _KERNEL */

#ifndef	_KERNEL

__BEGIN_DECLS
int	accept(int, struct sockaddr * __restrict, socklen_t * __restrict);
int	bind(int, const struct sockaddr *, socklen_t);
int	connect(int, const struct sockaddr *, socklen_t);
int	getpeername(int, struct sockaddr * __restrict, socklen_t * __restrict);
int	getsockname(int, struct sockaddr * __restrict, socklen_t * __restrict);
int	getsockopt(int, int, int, void *__restrict, socklen_t * __restrict);
int	listen(int, int);
ssize_t	recv(int, void *, size_t, int);
ssize_t	recvfrom(int, void *__restrict, size_t, int,
	    struct sockaddr * __restrict, socklen_t * __restrict);
ssize_t	recvmsg(int, struct msghdr *, int);
ssize_t	send(int, const void *, size_t, int);
ssize_t	sendto(int, const void *,
	    size_t, int, const struct sockaddr *, socklen_t);
ssize_t	sendmsg(int, const struct msghdr *, int);
int	setsockopt(int, int, int, const void *, socklen_t);
int	shutdown(int, int);
int	sockatmark(int);
int	socket(int, int, int)
#if !defined(__LIBC12_SOURCE__) && !defined(_STANDALONE)
__RENAME(__socket30)
#endif
			     ;
int	socketpair(int, int, int, int *);
__END_DECLS
#endif /* !_KERNEL */

#endif /* !_SYS_SOCKET_H_ */