/*	$NetBSD: un.h,v 1.61 2023/11/08 19:27:13 jschauma Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1993
 *	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.
 *
 *	@(#)un.h	8.3 (Berkeley) 2/19/95
 */

#ifndef _SYS_UN_H_
#define _SYS_UN_H_

#include <sys/ansi.h>
#include <sys/featuretest.h>
#include <sys/types.h>

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

/*
 * Historically, (struct sockaddr) needed to fit inside an mbuf.
 * For this reason, UNIX domain sockets were therefore limited to
 * 104 bytes. While this limit is no longer necessary, it is kept for
 * binary compatibility reasons.
 */
#define	SUNPATHLEN	104

/*
 * Definitions for UNIX IPC domain.
 */
struct	sockaddr_un {
	uint8_t		sun_len;		/* total sockaddr length */
	sa_family_t	sun_family;		/* AF_LOCAL */
	char		sun_path[SUNPATHLEN];	/* path name (gag) */
};

/*
 * Socket options for UNIX IPC domain.
 */
#if defined(_NETBSD_SOURCE)
#define SOL_LOCAL	0		/* options level for getsockopt(2) */
#define	LOCAL_OCREDS	0x0001		/* pass credentials to receiver */
#define	LOCAL_CONNWAIT	0x0002		/* connects block until accepted */
#define	LOCAL_PEEREID	0x0003		/* get peer identification */
#define	LOCAL_CREDS	0x0004		/* pass credentials to receiver */
#endif

/*
 * Data automatically stored inside connect() for use by LOCAL_PEEREID
 */
struct unpcbid {
	pid_t unp_pid;		/* process id */
	uid_t unp_euid;		/* effective user id */
	gid_t unp_egid;		/* effective group id */
};

#ifdef _KERNEL

struct unpcb;
struct socket;
struct sockopt;
struct sockaddr;

extern const struct pr_usrreqs unp_usrreqs;

int	uipc_ctloutput(int, struct socket *, struct sockopt *);
void	uipc_init(void);
kmutex_t *uipc_dgramlock(void);
kmutex_t *uipc_streamlock(void);
kmutex_t *uipc_rawlock(void);

int	unp_connect(struct socket *, struct sockaddr *, struct lwp *);
int	unp_connect2(struct socket *, struct socket *);
void 	unp_dispose(struct mbuf *);
int 	unp_externalize(struct mbuf *, struct lwp *, int);

#else /* !_KERNEL */

/* actual length of an initialized sockaddr_un */
#if defined(_NETBSD_SOURCE)
#define SUN_LEN(su) \
	(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
#endif /* !_NetBSD_SOURCE */
#endif /* _KERNEL */

#endif /* !_SYS_UN_H_ */