xref: /freebsd/sys/kern/uipc_usrreq.c (revision e5aeaa0c675b69f2698c4b8d4b961e5867b537ac)
1df8bae1dSRodney W. Grimes /*
2df8bae1dSRodney W. Grimes  * Copyright (c) 1982, 1986, 1989, 1991, 1993
3df8bae1dSRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
4df8bae1dSRodney W. Grimes  *
5df8bae1dSRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
6df8bae1dSRodney W. Grimes  * modification, are permitted provided that the following conditions
7df8bae1dSRodney W. Grimes  * are met:
8df8bae1dSRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
9df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
10df8bae1dSRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
11df8bae1dSRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
12df8bae1dSRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
13df8bae1dSRodney W. Grimes  * 3. All advertising materials mentioning features or use of this software
14df8bae1dSRodney W. Grimes  *    must display the following acknowledgement:
15df8bae1dSRodney W. Grimes  *	This product includes software developed by the University of
16df8bae1dSRodney W. Grimes  *	California, Berkeley and its contributors.
17df8bae1dSRodney W. Grimes  * 4. Neither the name of the University nor the names of its contributors
18df8bae1dSRodney W. Grimes  *    may be used to endorse or promote products derived from this software
19df8bae1dSRodney W. Grimes  *    without specific prior written permission.
20df8bae1dSRodney W. Grimes  *
21df8bae1dSRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22df8bae1dSRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23df8bae1dSRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24df8bae1dSRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25df8bae1dSRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26df8bae1dSRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27df8bae1dSRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28df8bae1dSRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29df8bae1dSRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30df8bae1dSRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31df8bae1dSRodney W. Grimes  * SUCH DAMAGE.
32df8bae1dSRodney W. Grimes  *
33748e0b0aSGarrett Wollman  *	From: @(#)uipc_usrreq.c	8.3 (Berkeley) 1/4/94
34df8bae1dSRodney W. Grimes  */
35df8bae1dSRodney W. Grimes 
36677b542eSDavid E. O'Brien #include <sys/cdefs.h>
37677b542eSDavid E. O'Brien __FBSDID("$FreeBSD$");
38677b542eSDavid E. O'Brien 
39335654d7SRobert Watson #include "opt_mac.h"
40335654d7SRobert Watson 
41df8bae1dSRodney W. Grimes #include <sys/param.h>
42fb919e4dSMark Murray #include <sys/domain.h>
43960ed29cSSeigo Tanimura #include <sys/fcntl.h>
44d826c479SBruce Evans #include <sys/malloc.h>		/* XXX must be before <sys/file.h> */
45639acc13SGarrett Wollman #include <sys/file.h>
46960ed29cSSeigo Tanimura #include <sys/filedesc.h>
47960ed29cSSeigo Tanimura #include <sys/jail.h>
48960ed29cSSeigo Tanimura #include <sys/kernel.h>
49960ed29cSSeigo Tanimura #include <sys/lock.h>
506ea48a90SRobert Watson #include <sys/mac.h>
51639acc13SGarrett Wollman #include <sys/mbuf.h>
52960ed29cSSeigo Tanimura #include <sys/mutex.h>
53639acc13SGarrett Wollman #include <sys/namei.h>
54639acc13SGarrett Wollman #include <sys/proc.h>
55df8bae1dSRodney W. Grimes #include <sys/protosw.h>
56960ed29cSSeigo Tanimura #include <sys/resourcevar.h>
57df8bae1dSRodney W. Grimes #include <sys/socket.h>
58df8bae1dSRodney W. Grimes #include <sys/socketvar.h>
59960ed29cSSeigo Tanimura #include <sys/signalvar.h>
60df8bae1dSRodney W. Grimes #include <sys/stat.h>
61960ed29cSSeigo Tanimura #include <sys/sx.h>
62639acc13SGarrett Wollman #include <sys/sysctl.h>
63960ed29cSSeigo Tanimura #include <sys/systm.h>
64639acc13SGarrett Wollman #include <sys/un.h>
6598271db4SGarrett Wollman #include <sys/unpcb.h>
66639acc13SGarrett Wollman #include <sys/vnode.h>
67df8bae1dSRodney W. Grimes 
689e9d298aSJeff Roberson #include <vm/uma.h>
6998271db4SGarrett Wollman 
709e9d298aSJeff Roberson static uma_zone_t unp_zone;
7198271db4SGarrett Wollman static	unp_gen_t unp_gencnt;
7298271db4SGarrett Wollman static	u_int unp_count;
7398271db4SGarrett Wollman 
7498271db4SGarrett Wollman static	struct unp_head unp_shead, unp_dhead;
7598271db4SGarrett Wollman 
76df8bae1dSRodney W. Grimes /*
77df8bae1dSRodney W. Grimes  * Unix communications domain.
78df8bae1dSRodney W. Grimes  *
79df8bae1dSRodney W. Grimes  * TODO:
80df8bae1dSRodney W. Grimes  *	SEQPACKET, RDM
81df8bae1dSRodney W. Grimes  *	rethink name space problems
82df8bae1dSRodney W. Grimes  *	need a proper out-of-band
8398271db4SGarrett Wollman  *	lock pushdown
84df8bae1dSRodney W. Grimes  */
85f708ef1bSPoul-Henning Kamp static struct	sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
86f708ef1bSPoul-Henning Kamp static ino_t	unp_ino;		/* prototype for fake inode numbers */
87f708ef1bSPoul-Henning Kamp 
884d77a549SAlfred Perlstein static int     unp_attach(struct socket *);
894d77a549SAlfred Perlstein static void    unp_detach(struct unpcb *);
904d77a549SAlfred Perlstein static int     unp_bind(struct unpcb *,struct sockaddr *, struct thread *);
9170f52b48SBruce Evans static int     unp_connect(struct socket *,struct sockaddr *, struct thread *);
924d77a549SAlfred Perlstein static void    unp_disconnect(struct unpcb *);
934d77a549SAlfred Perlstein static void    unp_shutdown(struct unpcb *);
944d77a549SAlfred Perlstein static void    unp_drop(struct unpcb *, int);
954d77a549SAlfred Perlstein static void    unp_gc(void);
964d77a549SAlfred Perlstein static void    unp_scan(struct mbuf *, void (*)(struct file *));
974d77a549SAlfred Perlstein static void    unp_mark(struct file *);
984d77a549SAlfred Perlstein static void    unp_discard(struct file *);
994d77a549SAlfred Perlstein static void    unp_freerights(struct file **, int);
1004d77a549SAlfred Perlstein static int     unp_internalize(struct mbuf **, struct thread *);
1014d77a549SAlfred Perlstein static int     unp_listen(struct unpcb *, struct thread *);
102f708ef1bSPoul-Henning Kamp 
103a29f300eSGarrett Wollman static int
104a29f300eSGarrett Wollman uipc_abort(struct socket *so)
105df8bae1dSRodney W. Grimes {
106df8bae1dSRodney W. Grimes 	struct unpcb *unp = sotounpcb(so);
107df8bae1dSRodney W. Grimes 
108a29f300eSGarrett Wollman 	if (unp == 0)
109e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
110a29f300eSGarrett Wollman 	unp_drop(unp, ECONNABORTED);
111ddb7d629SIan Dowse 	unp_detach(unp);
112ddb7d629SIan Dowse 	sotryfree(so);
113e5aeaa0cSDag-Erling Smørgrav 	return (0);
114df8bae1dSRodney W. Grimes }
115df8bae1dSRodney W. Grimes 
116a29f300eSGarrett Wollman static int
11757bf258eSGarrett Wollman uipc_accept(struct socket *so, struct sockaddr **nam)
118a29f300eSGarrett Wollman {
119a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
120df8bae1dSRodney W. Grimes 
121a29f300eSGarrett Wollman 	if (unp == 0)
122e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
123df8bae1dSRodney W. Grimes 
124df8bae1dSRodney W. Grimes 	/*
125df8bae1dSRodney W. Grimes 	 * Pass back name of connected socket,
126df8bae1dSRodney W. Grimes 	 * if it was bound and we are still connected
127df8bae1dSRodney W. Grimes 	 * (our peer may have closed already!).
128df8bae1dSRodney W. Grimes 	 */
129df8bae1dSRodney W. Grimes 	if (unp->unp_conn && unp->unp_conn->unp_addr) {
13057bf258eSGarrett Wollman 		*nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
13157bf258eSGarrett Wollman 				    1);
132df8bae1dSRodney W. Grimes 	} else {
13357bf258eSGarrett Wollman 		*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
134df8bae1dSRodney W. Grimes 	}
135e5aeaa0cSDag-Erling Smørgrav 	return (0);
136a29f300eSGarrett Wollman }
137df8bae1dSRodney W. Grimes 
138a29f300eSGarrett Wollman static int
139b40ce416SJulian Elischer uipc_attach(struct socket *so, int proto, struct thread *td)
140a29f300eSGarrett Wollman {
141a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
142df8bae1dSRodney W. Grimes 
143a29f300eSGarrett Wollman 	if (unp != 0)
144e5aeaa0cSDag-Erling Smørgrav 		return (EISCONN);
145e5aeaa0cSDag-Erling Smørgrav 	return (unp_attach(so));
146a29f300eSGarrett Wollman }
147a29f300eSGarrett Wollman 
148a29f300eSGarrett Wollman static int
149b40ce416SJulian Elischer uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
150a29f300eSGarrett Wollman {
151a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
152a29f300eSGarrett Wollman 
153a29f300eSGarrett Wollman 	if (unp == 0)
154e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
155a29f300eSGarrett Wollman 
156e5aeaa0cSDag-Erling Smørgrav 	return (unp_bind(unp, nam, td));
157a29f300eSGarrett Wollman }
158a29f300eSGarrett Wollman 
159a29f300eSGarrett Wollman static int
160b40ce416SJulian Elischer uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
161a29f300eSGarrett Wollman {
162a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
163a29f300eSGarrett Wollman 
164a29f300eSGarrett Wollman 	if (unp == 0)
165e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
166e5aeaa0cSDag-Erling Smørgrav 	return (unp_connect(so, nam, curthread));
167a29f300eSGarrett Wollman }
168a29f300eSGarrett Wollman 
169a29f300eSGarrett Wollman static int
170a29f300eSGarrett Wollman uipc_connect2(struct socket *so1, struct socket *so2)
171a29f300eSGarrett Wollman {
172a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so1);
173a29f300eSGarrett Wollman 
174a29f300eSGarrett Wollman 	if (unp == 0)
175e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
176a29f300eSGarrett Wollman 
177e5aeaa0cSDag-Erling Smørgrav 	return (unp_connect2(so1, so2));
178a29f300eSGarrett Wollman }
179a29f300eSGarrett Wollman 
180a29f300eSGarrett Wollman /* control is EOPNOTSUPP */
181a29f300eSGarrett Wollman 
182a29f300eSGarrett Wollman static int
183a29f300eSGarrett Wollman uipc_detach(struct socket *so)
184a29f300eSGarrett Wollman {
185a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
186a29f300eSGarrett Wollman 
187a29f300eSGarrett Wollman 	if (unp == 0)
188e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
189a29f300eSGarrett Wollman 
190a29f300eSGarrett Wollman 	unp_detach(unp);
191e5aeaa0cSDag-Erling Smørgrav 	return (0);
192a29f300eSGarrett Wollman }
193a29f300eSGarrett Wollman 
194a29f300eSGarrett Wollman static int
195a29f300eSGarrett Wollman uipc_disconnect(struct socket *so)
196a29f300eSGarrett Wollman {
197a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
198a29f300eSGarrett Wollman 
199a29f300eSGarrett Wollman 	if (unp == 0)
200e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
201a29f300eSGarrett Wollman 	unp_disconnect(unp);
202e5aeaa0cSDag-Erling Smørgrav 	return (0);
203a29f300eSGarrett Wollman }
204a29f300eSGarrett Wollman 
205a29f300eSGarrett Wollman static int
206b40ce416SJulian Elischer uipc_listen(struct socket *so, struct thread *td)
207a29f300eSGarrett Wollman {
208a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
209a29f300eSGarrett Wollman 
210a29f300eSGarrett Wollman 	if (unp == 0 || unp->unp_vnode == 0)
211e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
212e5aeaa0cSDag-Erling Smørgrav 	return (unp_listen(unp, td));
213a29f300eSGarrett Wollman }
214a29f300eSGarrett Wollman 
215a29f300eSGarrett Wollman static int
21657bf258eSGarrett Wollman uipc_peeraddr(struct socket *so, struct sockaddr **nam)
217a29f300eSGarrett Wollman {
218a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
219a29f300eSGarrett Wollman 
220a29f300eSGarrett Wollman 	if (unp == 0)
221e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
22257bf258eSGarrett Wollman 	if (unp->unp_conn && unp->unp_conn->unp_addr)
22357bf258eSGarrett Wollman 		*nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
22457bf258eSGarrett Wollman 				    1);
225bdc5f6a3SHajimu UMEMOTO 	else {
226bdc5f6a3SHajimu UMEMOTO 		/*
227bdc5f6a3SHajimu UMEMOTO 		 * XXX: It seems that this test always fails even when
228bdc5f6a3SHajimu UMEMOTO 		 * connection is established.  So, this else clause is
229bdc5f6a3SHajimu UMEMOTO 		 * added as workaround to return PF_LOCAL sockaddr.
230bdc5f6a3SHajimu UMEMOTO 		 */
23156b3905fSHajimu UMEMOTO 		*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
232bdc5f6a3SHajimu UMEMOTO 	}
233e5aeaa0cSDag-Erling Smørgrav 	return (0);
234a29f300eSGarrett Wollman }
235a29f300eSGarrett Wollman 
236a29f300eSGarrett Wollman static int
237a29f300eSGarrett Wollman uipc_rcvd(struct socket *so, int flags)
238a29f300eSGarrett Wollman {
239a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
240a29f300eSGarrett Wollman 	struct socket *so2;
2416aef685fSBrian Feldman 	u_long newhiwat;
242a29f300eSGarrett Wollman 
243a29f300eSGarrett Wollman 	if (unp == 0)
244e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
245df8bae1dSRodney W. Grimes 	switch (so->so_type) {
246df8bae1dSRodney W. Grimes 	case SOCK_DGRAM:
247a29f300eSGarrett Wollman 		panic("uipc_rcvd DGRAM?");
248df8bae1dSRodney W. Grimes 		/*NOTREACHED*/
249df8bae1dSRodney W. Grimes 
250df8bae1dSRodney W. Grimes 	case SOCK_STREAM:
251df8bae1dSRodney W. Grimes 		if (unp->unp_conn == 0)
252df8bae1dSRodney W. Grimes 			break;
253df8bae1dSRodney W. Grimes 		so2 = unp->unp_conn->unp_socket;
254df8bae1dSRodney W. Grimes 		/*
255df8bae1dSRodney W. Grimes 		 * Adjust backpressure on sender
256df8bae1dSRodney W. Grimes 		 * and wakeup any waiting to write.
257df8bae1dSRodney W. Grimes 		 */
258ff8b0106SBrian Feldman 		so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
259ff8b0106SBrian Feldman 		unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
2606aef685fSBrian Feldman 		newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
2616aef685fSBrian Feldman 		    so->so_rcv.sb_cc;
262f535380cSDon Lewis 		(void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
2636aef685fSBrian Feldman 		    newhiwat, RLIM_INFINITY);
264ff8b0106SBrian Feldman 		unp->unp_cc = so->so_rcv.sb_cc;
265df8bae1dSRodney W. Grimes 		sowwakeup(so2);
266df8bae1dSRodney W. Grimes 		break;
267df8bae1dSRodney W. Grimes 
268df8bae1dSRodney W. Grimes 	default:
269a29f300eSGarrett Wollman 		panic("uipc_rcvd unknown socktype");
270df8bae1dSRodney W. Grimes 	}
271e5aeaa0cSDag-Erling Smørgrav 	return (0);
272a29f300eSGarrett Wollman }
273df8bae1dSRodney W. Grimes 
274a29f300eSGarrett Wollman /* pru_rcvoob is EOPNOTSUPP */
275a29f300eSGarrett Wollman 
276a29f300eSGarrett Wollman static int
27757bf258eSGarrett Wollman uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
278b40ce416SJulian Elischer 	  struct mbuf *control, struct thread *td)
279a29f300eSGarrett Wollman {
280a29f300eSGarrett Wollman 	int error = 0;
281a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
282a29f300eSGarrett Wollman 	struct socket *so2;
2836aef685fSBrian Feldman 	u_long newhiwat;
284a29f300eSGarrett Wollman 
285a29f300eSGarrett Wollman 	if (unp == 0) {
286a29f300eSGarrett Wollman 		error = EINVAL;
287a29f300eSGarrett Wollman 		goto release;
288a29f300eSGarrett Wollman 	}
289a29f300eSGarrett Wollman 	if (flags & PRUS_OOB) {
290a29f300eSGarrett Wollman 		error = EOPNOTSUPP;
291a29f300eSGarrett Wollman 		goto release;
292a29f300eSGarrett Wollman 	}
293a29f300eSGarrett Wollman 
2942bc21ed9SDavid Malone 	if (control && (error = unp_internalize(&control, td)))
295a29f300eSGarrett Wollman 		goto release;
296df8bae1dSRodney W. Grimes 
297a29f300eSGarrett Wollman 	switch (so->so_type) {
298a29f300eSGarrett Wollman 	case SOCK_DGRAM:
299a29f300eSGarrett Wollman 	{
300df8bae1dSRodney W. Grimes 		struct sockaddr *from;
301df8bae1dSRodney W. Grimes 
302df8bae1dSRodney W. Grimes 		if (nam) {
303df8bae1dSRodney W. Grimes 			if (unp->unp_conn) {
304df8bae1dSRodney W. Grimes 				error = EISCONN;
305df8bae1dSRodney W. Grimes 				break;
306df8bae1dSRodney W. Grimes 			}
307b40ce416SJulian Elischer 			error = unp_connect(so, nam, td);
308df8bae1dSRodney W. Grimes 			if (error)
309df8bae1dSRodney W. Grimes 				break;
310df8bae1dSRodney W. Grimes 		} else {
311df8bae1dSRodney W. Grimes 			if (unp->unp_conn == 0) {
312df8bae1dSRodney W. Grimes 				error = ENOTCONN;
313df8bae1dSRodney W. Grimes 				break;
314df8bae1dSRodney W. Grimes 			}
315df8bae1dSRodney W. Grimes 		}
316df8bae1dSRodney W. Grimes 		so2 = unp->unp_conn->unp_socket;
317df8bae1dSRodney W. Grimes 		if (unp->unp_addr)
31857bf258eSGarrett Wollman 			from = (struct sockaddr *)unp->unp_addr;
319df8bae1dSRodney W. Grimes 		else
320df8bae1dSRodney W. Grimes 			from = &sun_noname;
321df8bae1dSRodney W. Grimes 		if (sbappendaddr(&so2->so_rcv, from, m, control)) {
322df8bae1dSRodney W. Grimes 			sorwakeup(so2);
323df8bae1dSRodney W. Grimes 			m = 0;
324df8bae1dSRodney W. Grimes 			control = 0;
325e5aeaa0cSDag-Erling Smørgrav 		} else {
326df8bae1dSRodney W. Grimes 			error = ENOBUFS;
327e5aeaa0cSDag-Erling Smørgrav 		}
328df8bae1dSRodney W. Grimes 		if (nam)
329df8bae1dSRodney W. Grimes 			unp_disconnect(unp);
330df8bae1dSRodney W. Grimes 		break;
331df8bae1dSRodney W. Grimes 	}
332df8bae1dSRodney W. Grimes 
333df8bae1dSRodney W. Grimes 	case SOCK_STREAM:
3346b8fda4dSGarrett Wollman 		/* Connect if not connected yet. */
3356b8fda4dSGarrett Wollman 		/*
3366b8fda4dSGarrett Wollman 		 * Note: A better implementation would complain
337402cc72dSDavid Greenman 		 * if not equal to the peer's address.
3386b8fda4dSGarrett Wollman 		 */
339402cc72dSDavid Greenman 		if ((so->so_state & SS_ISCONNECTED) == 0) {
340402cc72dSDavid Greenman 			if (nam) {
341b40ce416SJulian Elischer 				error = unp_connect(so, nam, td);
342402cc72dSDavid Greenman 				if (error)
3436b8fda4dSGarrett Wollman 					break;	/* XXX */
344402cc72dSDavid Greenman 			} else {
345402cc72dSDavid Greenman 				error = ENOTCONN;
346402cc72dSDavid Greenman 				break;
347402cc72dSDavid Greenman 			}
348402cc72dSDavid Greenman 		}
349402cc72dSDavid Greenman 
350df8bae1dSRodney W. Grimes 		if (so->so_state & SS_CANTSENDMORE) {
351df8bae1dSRodney W. Grimes 			error = EPIPE;
352df8bae1dSRodney W. Grimes 			break;
353df8bae1dSRodney W. Grimes 		}
354df8bae1dSRodney W. Grimes 		if (unp->unp_conn == 0)
355a29f300eSGarrett Wollman 			panic("uipc_send connected but no connection?");
356df8bae1dSRodney W. Grimes 		so2 = unp->unp_conn->unp_socket;
357df8bae1dSRodney W. Grimes 		/*
358df8bae1dSRodney W. Grimes 		 * Send to paired receive port, and then reduce
359df8bae1dSRodney W. Grimes 		 * send buffer hiwater marks to maintain backpressure.
360df8bae1dSRodney W. Grimes 		 * Wake up readers.
361df8bae1dSRodney W. Grimes 		 */
362df8bae1dSRodney W. Grimes 		if (control) {
363ff8b0106SBrian Feldman 			if (sbappendcontrol(&so2->so_rcv, m, control))
364df8bae1dSRodney W. Grimes 				control = 0;
365e5aeaa0cSDag-Erling Smørgrav 		} else {
366ff8b0106SBrian Feldman 			sbappend(&so2->so_rcv, m);
367e5aeaa0cSDag-Erling Smørgrav 		}
368ff8b0106SBrian Feldman 		so->so_snd.sb_mbmax -=
369ff8b0106SBrian Feldman 			so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
370ff8b0106SBrian Feldman 		unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
3716aef685fSBrian Feldman 		newhiwat = so->so_snd.sb_hiwat -
3726aef685fSBrian Feldman 		    (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
373f535380cSDon Lewis 		(void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
3746aef685fSBrian Feldman 		    newhiwat, RLIM_INFINITY);
375ff8b0106SBrian Feldman 		unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
376df8bae1dSRodney W. Grimes 		sorwakeup(so2);
377df8bae1dSRodney W. Grimes 		m = 0;
378df8bae1dSRodney W. Grimes 		break;
379df8bae1dSRodney W. Grimes 
380df8bae1dSRodney W. Grimes 	default:
381a29f300eSGarrett Wollman 		panic("uipc_send unknown socktype");
382df8bae1dSRodney W. Grimes 	}
383a29f300eSGarrett Wollman 
3846b8fda4dSGarrett Wollman 	/*
3856b8fda4dSGarrett Wollman 	 * SEND_EOF is equivalent to a SEND followed by
3866b8fda4dSGarrett Wollman 	 * a SHUTDOWN.
3876b8fda4dSGarrett Wollman 	 */
388a29f300eSGarrett Wollman 	if (flags & PRUS_EOF) {
3896b8fda4dSGarrett Wollman 		socantsendmore(so);
3906b8fda4dSGarrett Wollman 		unp_shutdown(unp);
3916b8fda4dSGarrett Wollman 	}
392df8bae1dSRodney W. Grimes 
393bd508d39SDon Lewis 	if (control && error != 0)
394bd508d39SDon Lewis 		unp_dispose(control);
395bd508d39SDon Lewis 
396a29f300eSGarrett Wollman release:
397a29f300eSGarrett Wollman 	if (control)
398a29f300eSGarrett Wollman 		m_freem(control);
399a29f300eSGarrett Wollman 	if (m)
400a29f300eSGarrett Wollman 		m_freem(m);
401e5aeaa0cSDag-Erling Smørgrav 	return (error);
402a29f300eSGarrett Wollman }
403df8bae1dSRodney W. Grimes 
404a29f300eSGarrett Wollman static int
405a29f300eSGarrett Wollman uipc_sense(struct socket *so, struct stat *sb)
406a29f300eSGarrett Wollman {
407a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
408a29f300eSGarrett Wollman 	struct socket *so2;
409a29f300eSGarrett Wollman 
410a29f300eSGarrett Wollman 	if (unp == 0)
411e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
412a29f300eSGarrett Wollman 	sb->st_blksize = so->so_snd.sb_hiwat;
413df8bae1dSRodney W. Grimes 	if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
414df8bae1dSRodney W. Grimes 		so2 = unp->unp_conn->unp_socket;
415a29f300eSGarrett Wollman 		sb->st_blksize += so2->so_rcv.sb_cc;
416df8bae1dSRodney W. Grimes 	}
417bfbb9ce6SPoul-Henning Kamp 	sb->st_dev = NOUDEV;
418df8bae1dSRodney W. Grimes 	if (unp->unp_ino == 0)
4196f782c46SJeffrey Hsu 		unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
420a29f300eSGarrett Wollman 	sb->st_ino = unp->unp_ino;
421df8bae1dSRodney W. Grimes 	return (0);
422a29f300eSGarrett Wollman }
423df8bae1dSRodney W. Grimes 
424a29f300eSGarrett Wollman static int
425a29f300eSGarrett Wollman uipc_shutdown(struct socket *so)
426a29f300eSGarrett Wollman {
427a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
428df8bae1dSRodney W. Grimes 
429a29f300eSGarrett Wollman 	if (unp == 0)
430e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
431a29f300eSGarrett Wollman 	socantsendmore(so);
432a29f300eSGarrett Wollman 	unp_shutdown(unp);
433e5aeaa0cSDag-Erling Smørgrav 	return (0);
434a29f300eSGarrett Wollman }
435df8bae1dSRodney W. Grimes 
436a29f300eSGarrett Wollman static int
43757bf258eSGarrett Wollman uipc_sockaddr(struct socket *so, struct sockaddr **nam)
438a29f300eSGarrett Wollman {
439a29f300eSGarrett Wollman 	struct unpcb *unp = sotounpcb(so);
440a29f300eSGarrett Wollman 
441a29f300eSGarrett Wollman 	if (unp == 0)
442e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
44357bf258eSGarrett Wollman 	if (unp->unp_addr)
44457bf258eSGarrett Wollman 		*nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
44583f3198bSThomas Moestl 	else
44683f3198bSThomas Moestl 		*nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
447e5aeaa0cSDag-Erling Smørgrav 	return (0);
448df8bae1dSRodney W. Grimes }
449a29f300eSGarrett Wollman 
450a29f300eSGarrett Wollman struct pr_usrreqs uipc_usrreqs = {
451a29f300eSGarrett Wollman 	uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
452a29f300eSGarrett Wollman 	uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
453a29f300eSGarrett Wollman 	uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
454a29f300eSGarrett Wollman 	uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
455a557af22SRobert Watson 	sosend, soreceive, sopoll, pru_sosetlabel_null
456a29f300eSGarrett Wollman };
457df8bae1dSRodney W. Grimes 
4580c1bb4fbSDima Dorfman int
4590c1bb4fbSDima Dorfman uipc_ctloutput(so, sopt)
4600c1bb4fbSDima Dorfman 	struct socket *so;
4610c1bb4fbSDima Dorfman 	struct sockopt *sopt;
4620c1bb4fbSDima Dorfman {
4630c1bb4fbSDima Dorfman 	struct unpcb *unp = sotounpcb(so);
4640c1bb4fbSDima Dorfman 	int error;
4650c1bb4fbSDima Dorfman 
4660c1bb4fbSDima Dorfman 	switch (sopt->sopt_dir) {
4670c1bb4fbSDima Dorfman 	case SOPT_GET:
4680c1bb4fbSDima Dorfman 		switch (sopt->sopt_name) {
4690c1bb4fbSDima Dorfman 		case LOCAL_PEERCRED:
4700c1bb4fbSDima Dorfman 			if (unp->unp_flags & UNP_HAVEPC)
4710c1bb4fbSDima Dorfman 				error = sooptcopyout(sopt, &unp->unp_peercred,
4720c1bb4fbSDima Dorfman 				    sizeof(unp->unp_peercred));
4730c1bb4fbSDima Dorfman 			else {
4740c1bb4fbSDima Dorfman 				if (so->so_type == SOCK_STREAM)
4750c1bb4fbSDima Dorfman 					error = ENOTCONN;
4760c1bb4fbSDima Dorfman 				else
4770c1bb4fbSDima Dorfman 					error = EINVAL;
4780c1bb4fbSDima Dorfman 			}
4790c1bb4fbSDima Dorfman 			break;
4800c1bb4fbSDima Dorfman 		default:
4810c1bb4fbSDima Dorfman 			error = EOPNOTSUPP;
4820c1bb4fbSDima Dorfman 			break;
4830c1bb4fbSDima Dorfman 		}
4840c1bb4fbSDima Dorfman 		break;
4850c1bb4fbSDima Dorfman 	case SOPT_SET:
4860c1bb4fbSDima Dorfman 	default:
4870c1bb4fbSDima Dorfman 		error = EOPNOTSUPP;
4880c1bb4fbSDima Dorfman 		break;
4890c1bb4fbSDima Dorfman 	}
4900c1bb4fbSDima Dorfman 	return (error);
4910c1bb4fbSDima Dorfman }
4920c1bb4fbSDima Dorfman 
493df8bae1dSRodney W. Grimes /*
494df8bae1dSRodney W. Grimes  * Both send and receive buffers are allocated PIPSIZ bytes of buffering
495df8bae1dSRodney W. Grimes  * for stream sockets, although the total for sender and receiver is
496df8bae1dSRodney W. Grimes  * actually only PIPSIZ.
497df8bae1dSRodney W. Grimes  * Datagram sockets really use the sendspace as the maximum datagram size,
498df8bae1dSRodney W. Grimes  * and don't really want to reserve the sendspace.  Their recvspace should
499df8bae1dSRodney W. Grimes  * be large enough for at least one max-size datagram plus address.
500df8bae1dSRodney W. Grimes  */
5015dce41c5SJohn Dyson #ifndef PIPSIZ
5025dce41c5SJohn Dyson #define	PIPSIZ	8192
5035dce41c5SJohn Dyson #endif
504f708ef1bSPoul-Henning Kamp static u_long	unpst_sendspace = PIPSIZ;
505f708ef1bSPoul-Henning Kamp static u_long	unpst_recvspace = PIPSIZ;
506f708ef1bSPoul-Henning Kamp static u_long	unpdg_sendspace = 2*1024;	/* really max datagram size */
507f708ef1bSPoul-Henning Kamp static u_long	unpdg_recvspace = 4*1024;
508df8bae1dSRodney W. Grimes 
509f708ef1bSPoul-Henning Kamp static int	unp_rights;			/* file descriptors in flight */
510df8bae1dSRodney W. Grimes 
511ce02431fSDoug Rabson SYSCTL_DECL(_net_local_stream);
512639acc13SGarrett Wollman SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
513639acc13SGarrett Wollman 	   &unpst_sendspace, 0, "");
514639acc13SGarrett Wollman SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
515639acc13SGarrett Wollman 	   &unpst_recvspace, 0, "");
516ce02431fSDoug Rabson SYSCTL_DECL(_net_local_dgram);
517639acc13SGarrett Wollman SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
518639acc13SGarrett Wollman 	   &unpdg_sendspace, 0, "");
519639acc13SGarrett Wollman SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
520639acc13SGarrett Wollman 	   &unpdg_recvspace, 0, "");
521ce02431fSDoug Rabson SYSCTL_DECL(_net_local);
522639acc13SGarrett Wollman SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
523639acc13SGarrett Wollman 
524f708ef1bSPoul-Henning Kamp static int
525df8bae1dSRodney W. Grimes unp_attach(so)
526df8bae1dSRodney W. Grimes 	struct socket *so;
527df8bae1dSRodney W. Grimes {
528df8bae1dSRodney W. Grimes 	register struct unpcb *unp;
529df8bae1dSRodney W. Grimes 	int error;
530df8bae1dSRodney W. Grimes 
531df8bae1dSRodney W. Grimes 	if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
532df8bae1dSRodney W. Grimes 		switch (so->so_type) {
533df8bae1dSRodney W. Grimes 
534df8bae1dSRodney W. Grimes 		case SOCK_STREAM:
535df8bae1dSRodney W. Grimes 			error = soreserve(so, unpst_sendspace, unpst_recvspace);
536df8bae1dSRodney W. Grimes 			break;
537df8bae1dSRodney W. Grimes 
538df8bae1dSRodney W. Grimes 		case SOCK_DGRAM:
539df8bae1dSRodney W. Grimes 			error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
540df8bae1dSRodney W. Grimes 			break;
541df8bae1dSRodney W. Grimes 
542df8bae1dSRodney W. Grimes 		default:
543df8bae1dSRodney W. Grimes 			panic("unp_attach");
544df8bae1dSRodney W. Grimes 		}
545df8bae1dSRodney W. Grimes 		if (error)
546df8bae1dSRodney W. Grimes 			return (error);
547df8bae1dSRodney W. Grimes 	}
548a163d034SWarner Losh 	unp = uma_zalloc(unp_zone, M_WAITOK);
54957bf258eSGarrett Wollman 	if (unp == NULL)
550df8bae1dSRodney W. Grimes 		return (ENOBUFS);
55157bf258eSGarrett Wollman 	bzero(unp, sizeof *unp);
55298271db4SGarrett Wollman 	unp->unp_gencnt = ++unp_gencnt;
55398271db4SGarrett Wollman 	unp_count++;
55498271db4SGarrett Wollman 	LIST_INIT(&unp->unp_refs);
555df8bae1dSRodney W. Grimes 	unp->unp_socket = so;
55698271db4SGarrett Wollman 	LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
55798271db4SGarrett Wollman 			 : &unp_shead, unp, unp_link);
558210a5a71SAlfred Perlstein 	so->so_pcb = unp;
559df8bae1dSRodney W. Grimes 	return (0);
560df8bae1dSRodney W. Grimes }
561df8bae1dSRodney W. Grimes 
562f708ef1bSPoul-Henning Kamp static void
563df8bae1dSRodney W. Grimes unp_detach(unp)
564df8bae1dSRodney W. Grimes 	register struct unpcb *unp;
565df8bae1dSRodney W. Grimes {
56698271db4SGarrett Wollman 	LIST_REMOVE(unp, unp_link);
56798271db4SGarrett Wollman 	unp->unp_gencnt = ++unp_gencnt;
56898271db4SGarrett Wollman 	--unp_count;
569df8bae1dSRodney W. Grimes 	if (unp->unp_vnode) {
570df8bae1dSRodney W. Grimes 		unp->unp_vnode->v_socket = 0;
571df8bae1dSRodney W. Grimes 		vrele(unp->unp_vnode);
572df8bae1dSRodney W. Grimes 		unp->unp_vnode = 0;
573df8bae1dSRodney W. Grimes 	}
574df8bae1dSRodney W. Grimes 	if (unp->unp_conn)
575df8bae1dSRodney W. Grimes 		unp_disconnect(unp);
5762e3c8fcbSPoul-Henning Kamp 	while (!LIST_EMPTY(&unp->unp_refs))
5772e3c8fcbSPoul-Henning Kamp 		unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
578df8bae1dSRodney W. Grimes 	soisdisconnected(unp->unp_socket);
579df8bae1dSRodney W. Grimes 	unp->unp_socket->so_pcb = 0;
580df8bae1dSRodney W. Grimes 	if (unp_rights) {
581df8bae1dSRodney W. Grimes 		/*
582df8bae1dSRodney W. Grimes 		 * Normally the receive buffer is flushed later,
583df8bae1dSRodney W. Grimes 		 * in sofree, but if our receive buffer holds references
584df8bae1dSRodney W. Grimes 		 * to descriptors that are now garbage, we will dispose
585df8bae1dSRodney W. Grimes 		 * of those descriptor references after the garbage collector
586df8bae1dSRodney W. Grimes 		 * gets them (resulting in a "panic: closef: count < 0").
587df8bae1dSRodney W. Grimes 		 */
588df8bae1dSRodney W. Grimes 		sorflush(unp->unp_socket);
589df8bae1dSRodney W. Grimes 		unp_gc();
590df8bae1dSRodney W. Grimes 	}
59157bf258eSGarrett Wollman 	if (unp->unp_addr)
59257bf258eSGarrett Wollman 		FREE(unp->unp_addr, M_SONAME);
5939e9d298aSJeff Roberson 	uma_zfree(unp_zone, unp);
594df8bae1dSRodney W. Grimes }
595df8bae1dSRodney W. Grimes 
596f708ef1bSPoul-Henning Kamp static int
597b40ce416SJulian Elischer unp_bind(unp, nam, td)
598df8bae1dSRodney W. Grimes 	struct unpcb *unp;
59957bf258eSGarrett Wollman 	struct sockaddr *nam;
600b40ce416SJulian Elischer 	struct thread *td;
601df8bae1dSRodney W. Grimes {
60257bf258eSGarrett Wollman 	struct sockaddr_un *soun = (struct sockaddr_un *)nam;
603f2a2857bSKirk McKusick 	struct vnode *vp;
604f2a2857bSKirk McKusick 	struct mount *mp;
605df8bae1dSRodney W. Grimes 	struct vattr vattr;
60657bf258eSGarrett Wollman 	int error, namelen;
607df8bae1dSRodney W. Grimes 	struct nameidata nd;
6088f364875SJulian Elischer 	char *buf;
609df8bae1dSRodney W. Grimes 
610df8bae1dSRodney W. Grimes 	if (unp->unp_vnode != NULL)
611df8bae1dSRodney W. Grimes 		return (EINVAL);
61255c85568SRobert Drehmel 
61357bf258eSGarrett Wollman 	namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
61457bf258eSGarrett Wollman 	if (namelen <= 0)
615e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
61655c85568SRobert Drehmel 
617a163d034SWarner Losh 	buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
61855c85568SRobert Drehmel 	strlcpy(buf, soun->sun_path, namelen + 1);
61955c85568SRobert Drehmel 
620f2a2857bSKirk McKusick restart:
621b65f6f6bSRobert Watson 	NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE,
622b40ce416SJulian Elischer 	    buf, td);
623df8bae1dSRodney W. Grimes /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
624797f2d22SPoul-Henning Kamp 	error = namei(&nd);
6258f364875SJulian Elischer 	if (error) {
6268f364875SJulian Elischer 		free(buf, M_TEMP);
627ad4ff090SJulian Elischer 		return (error);
6288f364875SJulian Elischer 	}
629df8bae1dSRodney W. Grimes 	vp = nd.ni_vp;
630f2a2857bSKirk McKusick 	if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
631762e6b85SEivind Eklund 		NDFREE(&nd, NDF_ONLY_PNBUF);
632df8bae1dSRodney W. Grimes 		if (nd.ni_dvp == vp)
633df8bae1dSRodney W. Grimes 			vrele(nd.ni_dvp);
634df8bae1dSRodney W. Grimes 		else
635df8bae1dSRodney W. Grimes 			vput(nd.ni_dvp);
636f2a2857bSKirk McKusick 		if (vp != NULL) {
637df8bae1dSRodney W. Grimes 			vrele(vp);
6388f364875SJulian Elischer 			free(buf, M_TEMP);
639df8bae1dSRodney W. Grimes 			return (EADDRINUSE);
640df8bae1dSRodney W. Grimes 		}
6418f364875SJulian Elischer 		error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
6428f364875SJulian Elischer 		if (error) {
6438f364875SJulian Elischer 			free(buf, M_TEMP);
644f2a2857bSKirk McKusick 			return (error);
6458f364875SJulian Elischer 		}
646f2a2857bSKirk McKusick 		goto restart;
647f2a2857bSKirk McKusick 	}
648df8bae1dSRodney W. Grimes 	VATTR_NULL(&vattr);
649df8bae1dSRodney W. Grimes 	vattr.va_type = VSOCK;
650b40ce416SJulian Elischer 	vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
6516ea48a90SRobert Watson #ifdef MAC
6526ea48a90SRobert Watson 	error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
6536ea48a90SRobert Watson 	    &vattr);
6546151efaaSRobert Watson #endif
6556ea48a90SRobert Watson 	if (error == 0) {
656a854ed98SJohn Baldwin 		VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
6577be2d300SMike Smith 		error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
6586ea48a90SRobert Watson 	}
659762e6b85SEivind Eklund 	NDFREE(&nd, NDF_ONLY_PNBUF);
6607be2d300SMike Smith 	vput(nd.ni_dvp);
6618f364875SJulian Elischer 	if (error) {
6628f364875SJulian Elischer 		free(buf, M_TEMP);
663df8bae1dSRodney W. Grimes 		return (error);
6648f364875SJulian Elischer 	}
665df8bae1dSRodney W. Grimes 	vp = nd.ni_vp;
666df8bae1dSRodney W. Grimes 	vp->v_socket = unp->unp_socket;
667df8bae1dSRodney W. Grimes 	unp->unp_vnode = vp;
66857bf258eSGarrett Wollman 	unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
669b40ce416SJulian Elischer 	VOP_UNLOCK(vp, 0, td);
670f2a2857bSKirk McKusick 	vn_finished_write(mp);
6718f364875SJulian Elischer 	free(buf, M_TEMP);
672df8bae1dSRodney W. Grimes 	return (0);
673df8bae1dSRodney W. Grimes }
674df8bae1dSRodney W. Grimes 
675f708ef1bSPoul-Henning Kamp static int
676b40ce416SJulian Elischer unp_connect(so, nam, td)
677df8bae1dSRodney W. Grimes 	struct socket *so;
67857bf258eSGarrett Wollman 	struct sockaddr *nam;
679b40ce416SJulian Elischer 	struct thread *td;
680df8bae1dSRodney W. Grimes {
68157bf258eSGarrett Wollman 	register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
682df8bae1dSRodney W. Grimes 	register struct vnode *vp;
683df8bae1dSRodney W. Grimes 	register struct socket *so2, *so3;
6840c1bb4fbSDima Dorfman 	struct unpcb *unp, *unp2, *unp3;
68557bf258eSGarrett Wollman 	int error, len;
686df8bae1dSRodney W. Grimes 	struct nameidata nd;
68757bf258eSGarrett Wollman 	char buf[SOCK_MAXADDRLEN];
688df8bae1dSRodney W. Grimes 
68957bf258eSGarrett Wollman 	len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
69057bf258eSGarrett Wollman 	if (len <= 0)
691e5aeaa0cSDag-Erling Smørgrav 		return (EINVAL);
69255c85568SRobert Drehmel 	strlcpy(buf, soun->sun_path, len + 1);
69357bf258eSGarrett Wollman 
694b40ce416SJulian Elischer 	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
695797f2d22SPoul-Henning Kamp 	error = namei(&nd);
696797f2d22SPoul-Henning Kamp 	if (error)
697df8bae1dSRodney W. Grimes 		return (error);
698df8bae1dSRodney W. Grimes 	vp = nd.ni_vp;
699762e6b85SEivind Eklund 	NDFREE(&nd, NDF_ONLY_PNBUF);
700df8bae1dSRodney W. Grimes 	if (vp->v_type != VSOCK) {
701df8bae1dSRodney W. Grimes 		error = ENOTSOCK;
702df8bae1dSRodney W. Grimes 		goto bad;
703df8bae1dSRodney W. Grimes 	}
704a854ed98SJohn Baldwin 	error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
705797f2d22SPoul-Henning Kamp 	if (error)
706df8bae1dSRodney W. Grimes 		goto bad;
707df8bae1dSRodney W. Grimes 	so2 = vp->v_socket;
708df8bae1dSRodney W. Grimes 	if (so2 == 0) {
709df8bae1dSRodney W. Grimes 		error = ECONNREFUSED;
710df8bae1dSRodney W. Grimes 		goto bad;
711df8bae1dSRodney W. Grimes 	}
712df8bae1dSRodney W. Grimes 	if (so->so_type != so2->so_type) {
713df8bae1dSRodney W. Grimes 		error = EPROTOTYPE;
714df8bae1dSRodney W. Grimes 		goto bad;
715df8bae1dSRodney W. Grimes 	}
716df8bae1dSRodney W. Grimes 	if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
7174cc20ab1SSeigo Tanimura 		if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
7184cc20ab1SSeigo Tanimura 		    (so3 = sonewconn(so2, 0)) == 0) {
719df8bae1dSRodney W. Grimes 			error = ECONNREFUSED;
720df8bae1dSRodney W. Grimes 			goto bad;
721df8bae1dSRodney W. Grimes 		}
7220c1bb4fbSDima Dorfman 		unp = sotounpcb(so);
723df8bae1dSRodney W. Grimes 		unp2 = sotounpcb(so2);
724df8bae1dSRodney W. Grimes 		unp3 = sotounpcb(so3);
725df8bae1dSRodney W. Grimes 		if (unp2->unp_addr)
72657bf258eSGarrett Wollman 			unp3->unp_addr = (struct sockaddr_un *)
72757bf258eSGarrett Wollman 				dup_sockaddr((struct sockaddr *)
72857bf258eSGarrett Wollman 					     unp2->unp_addr, 1);
7290c1bb4fbSDima Dorfman 
7300c1bb4fbSDima Dorfman 		/*
7310c1bb4fbSDima Dorfman 		 * unp_peercred management:
7320c1bb4fbSDima Dorfman 		 *
7330c1bb4fbSDima Dorfman 		 * The connecter's (client's) credentials are copied
7340c1bb4fbSDima Dorfman 		 * from its process structure at the time of connect()
7350c1bb4fbSDima Dorfman 		 * (which is now).
7360c1bb4fbSDima Dorfman 		 */
737a854ed98SJohn Baldwin 		cru2x(td->td_ucred, &unp3->unp_peercred);
7380c1bb4fbSDima Dorfman 		unp3->unp_flags |= UNP_HAVEPC;
7390c1bb4fbSDima Dorfman 		/*
7400c1bb4fbSDima Dorfman 		 * The receiver's (server's) credentials are copied
7410c1bb4fbSDima Dorfman 		 * from the unp_peercred member of socket on which the
7420c1bb4fbSDima Dorfman 		 * former called listen(); unp_listen() cached that
7430c1bb4fbSDima Dorfman 		 * process's credentials at that time so we can use
7440c1bb4fbSDima Dorfman 		 * them now.
7450c1bb4fbSDima Dorfman 		 */
7460c1bb4fbSDima Dorfman 		KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
7470c1bb4fbSDima Dorfman 		    ("unp_connect: listener without cached peercred"));
7480c1bb4fbSDima Dorfman 		memcpy(&unp->unp_peercred, &unp2->unp_peercred,
7490c1bb4fbSDima Dorfman 		    sizeof(unp->unp_peercred));
7500c1bb4fbSDima Dorfman 		unp->unp_flags |= UNP_HAVEPC;
751335654d7SRobert Watson #ifdef MAC
752335654d7SRobert Watson 		mac_set_socket_peer_from_socket(so, so3);
753335654d7SRobert Watson 		mac_set_socket_peer_from_socket(so3, so);
754335654d7SRobert Watson #endif
7550c1bb4fbSDima Dorfman 
756df8bae1dSRodney W. Grimes 		so2 = so3;
757df8bae1dSRodney W. Grimes 	}
758df8bae1dSRodney W. Grimes 	error = unp_connect2(so, so2);
759df8bae1dSRodney W. Grimes bad:
760df8bae1dSRodney W. Grimes 	vput(vp);
761df8bae1dSRodney W. Grimes 	return (error);
762df8bae1dSRodney W. Grimes }
763df8bae1dSRodney W. Grimes 
76426f9a767SRodney W. Grimes int
765df8bae1dSRodney W. Grimes unp_connect2(so, so2)
766df8bae1dSRodney W. Grimes 	register struct socket *so;
767df8bae1dSRodney W. Grimes 	register struct socket *so2;
768df8bae1dSRodney W. Grimes {
769df8bae1dSRodney W. Grimes 	register struct unpcb *unp = sotounpcb(so);
770df8bae1dSRodney W. Grimes 	register struct unpcb *unp2;
771df8bae1dSRodney W. Grimes 
772df8bae1dSRodney W. Grimes 	if (so2->so_type != so->so_type)
773df8bae1dSRodney W. Grimes 		return (EPROTOTYPE);
774df8bae1dSRodney W. Grimes 	unp2 = sotounpcb(so2);
775df8bae1dSRodney W. Grimes 	unp->unp_conn = unp2;
776df8bae1dSRodney W. Grimes 	switch (so->so_type) {
777df8bae1dSRodney W. Grimes 
778df8bae1dSRodney W. Grimes 	case SOCK_DGRAM:
77998271db4SGarrett Wollman 		LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
780df8bae1dSRodney W. Grimes 		soisconnected(so);
781df8bae1dSRodney W. Grimes 		break;
782df8bae1dSRodney W. Grimes 
783df8bae1dSRodney W. Grimes 	case SOCK_STREAM:
784df8bae1dSRodney W. Grimes 		unp2->unp_conn = unp;
785df8bae1dSRodney W. Grimes 		soisconnected(so);
786df8bae1dSRodney W. Grimes 		soisconnected(so2);
787df8bae1dSRodney W. Grimes 		break;
788df8bae1dSRodney W. Grimes 
789df8bae1dSRodney W. Grimes 	default:
790df8bae1dSRodney W. Grimes 		panic("unp_connect2");
791df8bae1dSRodney W. Grimes 	}
792df8bae1dSRodney W. Grimes 	return (0);
793df8bae1dSRodney W. Grimes }
794df8bae1dSRodney W. Grimes 
795f708ef1bSPoul-Henning Kamp static void
796df8bae1dSRodney W. Grimes unp_disconnect(unp)
797df8bae1dSRodney W. Grimes 	struct unpcb *unp;
798df8bae1dSRodney W. Grimes {
799df8bae1dSRodney W. Grimes 	register struct unpcb *unp2 = unp->unp_conn;
800df8bae1dSRodney W. Grimes 
801df8bae1dSRodney W. Grimes 	if (unp2 == 0)
802df8bae1dSRodney W. Grimes 		return;
803df8bae1dSRodney W. Grimes 	unp->unp_conn = 0;
804df8bae1dSRodney W. Grimes 	switch (unp->unp_socket->so_type) {
805df8bae1dSRodney W. Grimes 
806df8bae1dSRodney W. Grimes 	case SOCK_DGRAM:
80798271db4SGarrett Wollman 		LIST_REMOVE(unp, unp_reflink);
808df8bae1dSRodney W. Grimes 		unp->unp_socket->so_state &= ~SS_ISCONNECTED;
809df8bae1dSRodney W. Grimes 		break;
810df8bae1dSRodney W. Grimes 
811df8bae1dSRodney W. Grimes 	case SOCK_STREAM:
812df8bae1dSRodney W. Grimes 		soisdisconnected(unp->unp_socket);
813df8bae1dSRodney W. Grimes 		unp2->unp_conn = 0;
814df8bae1dSRodney W. Grimes 		soisdisconnected(unp2->unp_socket);
815df8bae1dSRodney W. Grimes 		break;
816df8bae1dSRodney W. Grimes 	}
817df8bae1dSRodney W. Grimes }
818df8bae1dSRodney W. Grimes 
819df8bae1dSRodney W. Grimes #ifdef notdef
82026f9a767SRodney W. Grimes void
821df8bae1dSRodney W. Grimes unp_abort(unp)
822df8bae1dSRodney W. Grimes 	struct unpcb *unp;
823df8bae1dSRodney W. Grimes {
824df8bae1dSRodney W. Grimes 
825df8bae1dSRodney W. Grimes 	unp_detach(unp);
826df8bae1dSRodney W. Grimes }
827df8bae1dSRodney W. Grimes #endif
828df8bae1dSRodney W. Grimes 
82998271db4SGarrett Wollman static int
83082d9ae4eSPoul-Henning Kamp unp_pcblist(SYSCTL_HANDLER_ARGS)
83198271db4SGarrett Wollman {
832f5ef029eSPoul-Henning Kamp 	int error, i, n;
83398271db4SGarrett Wollman 	struct unpcb *unp, **unp_list;
83498271db4SGarrett Wollman 	unp_gen_t gencnt;
8358f364875SJulian Elischer 	struct xunpgen *xug;
83698271db4SGarrett Wollman 	struct unp_head *head;
8378f364875SJulian Elischer 	struct xunpcb *xu;
83898271db4SGarrett Wollman 
839a23d65bfSBruce Evans 	head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
84098271db4SGarrett Wollman 
84198271db4SGarrett Wollman 	/*
84298271db4SGarrett Wollman 	 * The process of preparing the PCB list is too time-consuming and
84398271db4SGarrett Wollman 	 * resource-intensive to repeat twice on every request.
84498271db4SGarrett Wollman 	 */
84598271db4SGarrett Wollman 	if (req->oldptr == 0) {
84698271db4SGarrett Wollman 		n = unp_count;
8478f364875SJulian Elischer 		req->oldidx = 2 * (sizeof *xug)
84898271db4SGarrett Wollman 			+ (n + n/8) * sizeof(struct xunpcb);
849e5aeaa0cSDag-Erling Smørgrav 		return (0);
85098271db4SGarrett Wollman 	}
85198271db4SGarrett Wollman 
85298271db4SGarrett Wollman 	if (req->newptr != 0)
853e5aeaa0cSDag-Erling Smørgrav 		return (EPERM);
85498271db4SGarrett Wollman 
85598271db4SGarrett Wollman 	/*
85698271db4SGarrett Wollman 	 * OK, now we're committed to doing something.
85798271db4SGarrett Wollman 	 */
858a163d034SWarner Losh 	xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
85998271db4SGarrett Wollman 	gencnt = unp_gencnt;
86098271db4SGarrett Wollman 	n = unp_count;
86198271db4SGarrett Wollman 
8628f364875SJulian Elischer 	xug->xug_len = sizeof *xug;
8638f364875SJulian Elischer 	xug->xug_count = n;
8648f364875SJulian Elischer 	xug->xug_gen = gencnt;
8658f364875SJulian Elischer 	xug->xug_sogen = so_gencnt;
8668f364875SJulian Elischer 	error = SYSCTL_OUT(req, xug, sizeof *xug);
8678f364875SJulian Elischer 	if (error) {
8688f364875SJulian Elischer 		free(xug, M_TEMP);
869e5aeaa0cSDag-Erling Smørgrav 		return (error);
8708f364875SJulian Elischer 	}
87198271db4SGarrett Wollman 
872a163d034SWarner Losh 	unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
87398271db4SGarrett Wollman 
8742e3c8fcbSPoul-Henning Kamp 	for (unp = LIST_FIRST(head), i = 0; unp && i < n;
8752e3c8fcbSPoul-Henning Kamp 	     unp = LIST_NEXT(unp, unp_link)) {
8768a7d8cc6SRobert Watson 		if (unp->unp_gencnt <= gencnt) {
877a854ed98SJohn Baldwin 			if (cr_cansee(req->td->td_ucred,
8788a7d8cc6SRobert Watson 			    unp->unp_socket->so_cred))
8794787fd37SPaul Saab 				continue;
88098271db4SGarrett Wollman 			unp_list[i++] = unp;
88198271db4SGarrett Wollman 		}
8824787fd37SPaul Saab 	}
88398271db4SGarrett Wollman 	n = i;			/* in case we lost some during malloc */
88498271db4SGarrett Wollman 
88598271db4SGarrett Wollman 	error = 0;
886a163d034SWarner Losh 	xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
88798271db4SGarrett Wollman 	for (i = 0; i < n; i++) {
88898271db4SGarrett Wollman 		unp = unp_list[i];
88998271db4SGarrett Wollman 		if (unp->unp_gencnt <= gencnt) {
8908f364875SJulian Elischer 			xu->xu_len = sizeof *xu;
8918f364875SJulian Elischer 			xu->xu_unpp = unp;
89298271db4SGarrett Wollman 			/*
89398271db4SGarrett Wollman 			 * XXX - need more locking here to protect against
89498271db4SGarrett Wollman 			 * connect/disconnect races for SMP.
89598271db4SGarrett Wollman 			 */
89698271db4SGarrett Wollman 			if (unp->unp_addr)
8978f364875SJulian Elischer 				bcopy(unp->unp_addr, &xu->xu_addr,
89898271db4SGarrett Wollman 				      unp->unp_addr->sun_len);
89998271db4SGarrett Wollman 			if (unp->unp_conn && unp->unp_conn->unp_addr)
90098271db4SGarrett Wollman 				bcopy(unp->unp_conn->unp_addr,
9018f364875SJulian Elischer 				      &xu->xu_caddr,
90298271db4SGarrett Wollman 				      unp->unp_conn->unp_addr->sun_len);
9038f364875SJulian Elischer 			bcopy(unp, &xu->xu_unp, sizeof *unp);
9048f364875SJulian Elischer 			sotoxsocket(unp->unp_socket, &xu->xu_socket);
9058f364875SJulian Elischer 			error = SYSCTL_OUT(req, xu, sizeof *xu);
90698271db4SGarrett Wollman 		}
90798271db4SGarrett Wollman 	}
9088f364875SJulian Elischer 	free(xu, M_TEMP);
90998271db4SGarrett Wollman 	if (!error) {
91098271db4SGarrett Wollman 		/*
91198271db4SGarrett Wollman 		 * Give the user an updated idea of our state.
91298271db4SGarrett Wollman 		 * If the generation differs from what we told
91398271db4SGarrett Wollman 		 * her before, she knows that something happened
91498271db4SGarrett Wollman 		 * while we were processing this request, and it
91598271db4SGarrett Wollman 		 * might be necessary to retry.
91698271db4SGarrett Wollman 		 */
9178f364875SJulian Elischer 		xug->xug_gen = unp_gencnt;
9188f364875SJulian Elischer 		xug->xug_sogen = so_gencnt;
9198f364875SJulian Elischer 		xug->xug_count = unp_count;
9208f364875SJulian Elischer 		error = SYSCTL_OUT(req, xug, sizeof *xug);
92198271db4SGarrett Wollman 	}
92298271db4SGarrett Wollman 	free(unp_list, M_TEMP);
9238f364875SJulian Elischer 	free(xug, M_TEMP);
924e5aeaa0cSDag-Erling Smørgrav 	return (error);
92598271db4SGarrett Wollman }
92698271db4SGarrett Wollman 
92798271db4SGarrett Wollman SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
92898271db4SGarrett Wollman 	    (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
92998271db4SGarrett Wollman 	    "List of active local datagram sockets");
93098271db4SGarrett Wollman SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
93198271db4SGarrett Wollman 	    (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
93298271db4SGarrett Wollman 	    "List of active local stream sockets");
93398271db4SGarrett Wollman 
934f708ef1bSPoul-Henning Kamp static void
935df8bae1dSRodney W. Grimes unp_shutdown(unp)
936df8bae1dSRodney W. Grimes 	struct unpcb *unp;
937df8bae1dSRodney W. Grimes {
938df8bae1dSRodney W. Grimes 	struct socket *so;
939df8bae1dSRodney W. Grimes 
940df8bae1dSRodney W. Grimes 	if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
941df8bae1dSRodney W. Grimes 	    (so = unp->unp_conn->unp_socket))
942df8bae1dSRodney W. Grimes 		socantrcvmore(so);
943df8bae1dSRodney W. Grimes }
944df8bae1dSRodney W. Grimes 
945f708ef1bSPoul-Henning Kamp static void
946df8bae1dSRodney W. Grimes unp_drop(unp, errno)
947df8bae1dSRodney W. Grimes 	struct unpcb *unp;
948df8bae1dSRodney W. Grimes 	int errno;
949df8bae1dSRodney W. Grimes {
950df8bae1dSRodney W. Grimes 	struct socket *so = unp->unp_socket;
951df8bae1dSRodney W. Grimes 
952df8bae1dSRodney W. Grimes 	so->so_error = errno;
953df8bae1dSRodney W. Grimes 	unp_disconnect(unp);
954df8bae1dSRodney W. Grimes }
955df8bae1dSRodney W. Grimes 
956df8bae1dSRodney W. Grimes #ifdef notdef
95726f9a767SRodney W. Grimes void
958df8bae1dSRodney W. Grimes unp_drain()
959df8bae1dSRodney W. Grimes {
960df8bae1dSRodney W. Grimes 
961df8bae1dSRodney W. Grimes }
962df8bae1dSRodney W. Grimes #endif
963df8bae1dSRodney W. Grimes 
9642bc21ed9SDavid Malone static void
9652bc21ed9SDavid Malone unp_freerights(rp, fdcount)
9662bc21ed9SDavid Malone 	struct file **rp;
9672bc21ed9SDavid Malone 	int fdcount;
968df8bae1dSRodney W. Grimes {
9692bc21ed9SDavid Malone 	int i;
9702bc21ed9SDavid Malone 	struct file *fp;
971df8bae1dSRodney W. Grimes 
9722bc21ed9SDavid Malone 	for (i = 0; i < fdcount; i++) {
973df8bae1dSRodney W. Grimes 		fp = *rp;
9748692c025SYoshinobu Inoue 		/*
9752bc21ed9SDavid Malone 		 * zero the pointer before calling
9762bc21ed9SDavid Malone 		 * unp_discard since it may end up
9772bc21ed9SDavid Malone 		 * in unp_gc()..
9788692c025SYoshinobu Inoue 		 */
979df8bae1dSRodney W. Grimes 		*rp++ = 0;
9808692c025SYoshinobu Inoue 		unp_discard(fp);
981df8bae1dSRodney W. Grimes 	}
9822bc21ed9SDavid Malone }
9832bc21ed9SDavid Malone 
9842bc21ed9SDavid Malone int
9852bc21ed9SDavid Malone unp_externalize(control, controlp)
9862bc21ed9SDavid Malone 	struct mbuf *control, **controlp;
9872bc21ed9SDavid Malone {
9882bc21ed9SDavid Malone 	struct thread *td = curthread;		/* XXX */
9892bc21ed9SDavid Malone 	struct cmsghdr *cm = mtod(control, struct cmsghdr *);
9902bc21ed9SDavid Malone 	int i;
9912bc21ed9SDavid Malone 	int *fdp;
9922bc21ed9SDavid Malone 	struct file **rp;
9932bc21ed9SDavid Malone 	struct file *fp;
9942bc21ed9SDavid Malone 	void *data;
9952bc21ed9SDavid Malone 	socklen_t clen = control->m_len, datalen;
9962bc21ed9SDavid Malone 	int error, newfds;
9972bc21ed9SDavid Malone 	int f;
9982bc21ed9SDavid Malone 	u_int newlen;
9992bc21ed9SDavid Malone 
10002bc21ed9SDavid Malone 	error = 0;
10012bc21ed9SDavid Malone 	if (controlp != NULL) /* controlp == NULL => free control messages */
10022bc21ed9SDavid Malone 		*controlp = NULL;
10032bc21ed9SDavid Malone 
10042bc21ed9SDavid Malone 	while (cm != NULL) {
10052bc21ed9SDavid Malone 		if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
10062bc21ed9SDavid Malone 			error = EINVAL;
10072bc21ed9SDavid Malone 			break;
10082bc21ed9SDavid Malone 		}
10092bc21ed9SDavid Malone 
10102bc21ed9SDavid Malone 		data = CMSG_DATA(cm);
10112bc21ed9SDavid Malone 		datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
10122bc21ed9SDavid Malone 
10132bc21ed9SDavid Malone 		if (cm->cmsg_level == SOL_SOCKET
10142bc21ed9SDavid Malone 		    && cm->cmsg_type == SCM_RIGHTS) {
10152bc21ed9SDavid Malone 			newfds = datalen / sizeof(struct file *);
10162bc21ed9SDavid Malone 			rp = data;
10172bc21ed9SDavid Malone 
1018e2f9a08bSOlivier Houchard 			/* If we're not outputting the descriptors free them. */
10192bc21ed9SDavid Malone 			if (error || controlp == NULL) {
10202bc21ed9SDavid Malone 				unp_freerights(rp, newfds);
10212bc21ed9SDavid Malone 				goto next;
10222bc21ed9SDavid Malone 			}
1023426da3bcSAlfred Perlstein 			FILEDESC_LOCK(td->td_proc->p_fd);
10242bc21ed9SDavid Malone 			/* if the new FD's will not fit free them.  */
10252bc21ed9SDavid Malone 			if (!fdavail(td, newfds)) {
1026426da3bcSAlfred Perlstein 				FILEDESC_UNLOCK(td->td_proc->p_fd);
10272bc21ed9SDavid Malone 				error = EMSGSIZE;
10282bc21ed9SDavid Malone 				unp_freerights(rp, newfds);
10292bc21ed9SDavid Malone 				goto next;
1030df8bae1dSRodney W. Grimes 			}
1031ed5b7817SJulian Elischer 			/*
10322bc21ed9SDavid Malone 			 * now change each pointer to an fd in the global
10332bc21ed9SDavid Malone 			 * table to an integer that is the index to the
10342bc21ed9SDavid Malone 			 * local fd table entry that we set up to point
10352bc21ed9SDavid Malone 			 * to the global one we are transferring.
1036ed5b7817SJulian Elischer 			 */
10372bc21ed9SDavid Malone 			newlen = newfds * sizeof(int);
10382bc21ed9SDavid Malone 			*controlp = sbcreatecontrol(NULL, newlen,
10392bc21ed9SDavid Malone 			    SCM_RIGHTS, SOL_SOCKET);
10402bc21ed9SDavid Malone 			if (*controlp == NULL) {
1041426da3bcSAlfred Perlstein 				FILEDESC_UNLOCK(td->td_proc->p_fd);
10422bc21ed9SDavid Malone 				error = E2BIG;
10432bc21ed9SDavid Malone 				unp_freerights(rp, newfds);
10442bc21ed9SDavid Malone 				goto next;
10452bc21ed9SDavid Malone 			}
10462bc21ed9SDavid Malone 
10472bc21ed9SDavid Malone 			fdp = (int *)
10482bc21ed9SDavid Malone 			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1049df8bae1dSRodney W. Grimes 			for (i = 0; i < newfds; i++) {
1050b40ce416SJulian Elischer 				if (fdalloc(td, 0, &f))
10512bc21ed9SDavid Malone 					panic("unp_externalize fdalloc failed");
10528692c025SYoshinobu Inoue 				fp = *rp++;
1053b40ce416SJulian Elischer 				td->td_proc->p_fd->fd_ofiles[f] = fp;
1054426da3bcSAlfred Perlstein 				FILE_LOCK(fp);
1055df8bae1dSRodney W. Grimes 				fp->f_msgcount--;
1056426da3bcSAlfred Perlstein 				FILE_UNLOCK(fp);
1057df8bae1dSRodney W. Grimes 				unp_rights--;
10588692c025SYoshinobu Inoue 				*fdp++ = f;
1059df8bae1dSRodney W. Grimes 			}
1060426da3bcSAlfred Perlstein 			FILEDESC_UNLOCK(td->td_proc->p_fd);
10612bc21ed9SDavid Malone 		} else { /* We can just copy anything else across */
10622bc21ed9SDavid Malone 			if (error || controlp == NULL)
10632bc21ed9SDavid Malone 				goto next;
10642bc21ed9SDavid Malone 			*controlp = sbcreatecontrol(NULL, datalen,
10652bc21ed9SDavid Malone 			    cm->cmsg_type, cm->cmsg_level);
10662bc21ed9SDavid Malone 			if (*controlp == NULL) {
10672bc21ed9SDavid Malone 				error = ENOBUFS;
10682bc21ed9SDavid Malone 				goto next;
10692bc21ed9SDavid Malone 			}
10702bc21ed9SDavid Malone 			bcopy(data,
10712bc21ed9SDavid Malone 			    CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
10722bc21ed9SDavid Malone 			    datalen);
10732bc21ed9SDavid Malone 		}
10742bc21ed9SDavid Malone 
10752bc21ed9SDavid Malone 		controlp = &(*controlp)->m_next;
10762bc21ed9SDavid Malone 
10772bc21ed9SDavid Malone next:
10782bc21ed9SDavid Malone 		if (CMSG_SPACE(datalen) < clen) {
10792bc21ed9SDavid Malone 			clen -= CMSG_SPACE(datalen);
10802bc21ed9SDavid Malone 			cm = (struct cmsghdr *)
10812bc21ed9SDavid Malone 			    ((caddr_t)cm + CMSG_SPACE(datalen));
10828692c025SYoshinobu Inoue 		} else {
10832bc21ed9SDavid Malone 			clen = 0;
10842bc21ed9SDavid Malone 			cm = NULL;
10858692c025SYoshinobu Inoue 		}
10868692c025SYoshinobu Inoue 	}
10878692c025SYoshinobu Inoue 
10882bc21ed9SDavid Malone 	m_freem(control);
10892bc21ed9SDavid Malone 
10902bc21ed9SDavid Malone 	return (error);
1091df8bae1dSRodney W. Grimes }
1092df8bae1dSRodney W. Grimes 
109398271db4SGarrett Wollman void
109498271db4SGarrett Wollman unp_init(void)
109598271db4SGarrett Wollman {
10969e9d298aSJeff Roberson 	unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
10979e9d298aSJeff Roberson 	    NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
1098586c8b6bSJeff Roberson 	uma_zone_set_max(unp_zone, nmbclusters);
109998271db4SGarrett Wollman 	if (unp_zone == 0)
110098271db4SGarrett Wollman 		panic("unp_init");
110198271db4SGarrett Wollman 	LIST_INIT(&unp_dhead);
110298271db4SGarrett Wollman 	LIST_INIT(&unp_shead);
110398271db4SGarrett Wollman }
110498271db4SGarrett Wollman 
1105f708ef1bSPoul-Henning Kamp static int
11062bc21ed9SDavid Malone unp_internalize(controlp, td)
11072bc21ed9SDavid Malone 	struct mbuf **controlp;
1108b40ce416SJulian Elischer 	struct thread *td;
1109df8bae1dSRodney W. Grimes {
11102bc21ed9SDavid Malone 	struct mbuf *control = *controlp;
1111b40ce416SJulian Elischer 	struct proc *p = td->td_proc;
11128692c025SYoshinobu Inoue 	struct filedesc *fdescp = p->p_fd;
11132bc21ed9SDavid Malone 	struct cmsghdr *cm = mtod(control, struct cmsghdr *);
11142bc21ed9SDavid Malone 	struct cmsgcred *cmcred;
11152bc21ed9SDavid Malone 	struct file **rp;
11162bc21ed9SDavid Malone 	struct file *fp;
11172bc21ed9SDavid Malone 	struct timeval *tv;
11182bc21ed9SDavid Malone 	int i, fd, *fdp;
11192bc21ed9SDavid Malone 	void *data;
11202bc21ed9SDavid Malone 	socklen_t clen = control->m_len, datalen;
11212bc21ed9SDavid Malone 	int error, oldfds;
11228692c025SYoshinobu Inoue 	u_int newlen;
1123df8bae1dSRodney W. Grimes 
11242bc21ed9SDavid Malone 	error = 0;
11252bc21ed9SDavid Malone 	*controlp = NULL;
11260b788fa1SBill Paul 
11272bc21ed9SDavid Malone 	while (cm != NULL) {
11282bc21ed9SDavid Malone 		if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
11292bc21ed9SDavid Malone 		    || cm->cmsg_len > clen) {
11302bc21ed9SDavid Malone 			error = EINVAL;
11312bc21ed9SDavid Malone 			goto out;
11322bc21ed9SDavid Malone 		}
11332bc21ed9SDavid Malone 
11342bc21ed9SDavid Malone 		data = CMSG_DATA(cm);
11352bc21ed9SDavid Malone 		datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
11362bc21ed9SDavid Malone 
11372bc21ed9SDavid Malone 		switch (cm->cmsg_type) {
11380b788fa1SBill Paul 		/*
11390b788fa1SBill Paul 		 * Fill in credential information.
11400b788fa1SBill Paul 		 */
11412bc21ed9SDavid Malone 		case SCM_CREDS:
11422bc21ed9SDavid Malone 			*controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
11432bc21ed9SDavid Malone 			    SCM_CREDS, SOL_SOCKET);
11442bc21ed9SDavid Malone 			if (*controlp == NULL) {
11452bc21ed9SDavid Malone 				error = ENOBUFS;
11462bc21ed9SDavid Malone 				goto out;
11472bc21ed9SDavid Malone 			}
11482bc21ed9SDavid Malone 
11492bc21ed9SDavid Malone 			cmcred = (struct cmsgcred *)
11502bc21ed9SDavid Malone 			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
11510b788fa1SBill Paul 			cmcred->cmcred_pid = p->p_pid;
1152a854ed98SJohn Baldwin 			cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1153a854ed98SJohn Baldwin 			cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1154a854ed98SJohn Baldwin 			cmcred->cmcred_euid = td->td_ucred->cr_uid;
1155a854ed98SJohn Baldwin 			cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
11560b788fa1SBill Paul 							CMGROUP_MAX);
11570b788fa1SBill Paul 			for (i = 0; i < cmcred->cmcred_ngroups; i++)
11582bc21ed9SDavid Malone 				cmcred->cmcred_groups[i] =
1159a854ed98SJohn Baldwin 				    td->td_ucred->cr_groups[i];
11602bc21ed9SDavid Malone 			break;
11610b788fa1SBill Paul 
11622bc21ed9SDavid Malone 		case SCM_RIGHTS:
11632bc21ed9SDavid Malone 			oldfds = datalen / sizeof (int);
1164ed5b7817SJulian Elischer 			/*
11652bc21ed9SDavid Malone 			 * check that all the FDs passed in refer to legal files
1166ed5b7817SJulian Elischer 			 * If not, reject the entire operation.
1167ed5b7817SJulian Elischer 			 */
11682bc21ed9SDavid Malone 			fdp = data;
1169426da3bcSAlfred Perlstein 			FILEDESC_LOCK(fdescp);
1170df8bae1dSRodney W. Grimes 			for (i = 0; i < oldfds; i++) {
11718692c025SYoshinobu Inoue 				fd = *fdp++;
11728692c025SYoshinobu Inoue 				if ((unsigned)fd >= fdescp->fd_nfiles ||
11732bc21ed9SDavid Malone 				    fdescp->fd_ofiles[fd] == NULL) {
1174426da3bcSAlfred Perlstein 					FILEDESC_UNLOCK(fdescp);
11752bc21ed9SDavid Malone 					error = EBADF;
11762bc21ed9SDavid Malone 					goto out;
11772bc21ed9SDavid Malone 				}
1178e7d6662fSAlfred Perlstein 				fp = fdescp->fd_ofiles[fd];
1179e7d6662fSAlfred Perlstein 				if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1180e7d6662fSAlfred Perlstein 					FILEDESC_UNLOCK(fdescp);
1181e7d6662fSAlfred Perlstein 					error = EOPNOTSUPP;
1182e7d6662fSAlfred Perlstein 					goto out;
1183e7d6662fSAlfred Perlstein 				}
1184e7d6662fSAlfred Perlstein 
1185df8bae1dSRodney W. Grimes 			}
1186ed5b7817SJulian Elischer 			/*
1187ed5b7817SJulian Elischer 			 * Now replace the integer FDs with pointers to
1188ed5b7817SJulian Elischer 			 * the associated global file table entry..
1189ed5b7817SJulian Elischer 			 */
11902bc21ed9SDavid Malone 			newlen = oldfds * sizeof(struct file *);
11912bc21ed9SDavid Malone 			*controlp = sbcreatecontrol(NULL, newlen,
11922bc21ed9SDavid Malone 			    SCM_RIGHTS, SOL_SOCKET);
11932bc21ed9SDavid Malone 			if (*controlp == NULL) {
1194426da3bcSAlfred Perlstein 				FILEDESC_UNLOCK(fdescp);
11952bc21ed9SDavid Malone 				error = E2BIG;
11962bc21ed9SDavid Malone 				goto out;
11978692c025SYoshinobu Inoue 			}
11988692c025SYoshinobu Inoue 
11992bc21ed9SDavid Malone 			fdp = data;
12002bc21ed9SDavid Malone 			rp = (struct file **)
12012bc21ed9SDavid Malone 			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
12028692c025SYoshinobu Inoue 			for (i = 0; i < oldfds; i++) {
12038692c025SYoshinobu Inoue 				fp = fdescp->fd_ofiles[*fdp++];
1204df8bae1dSRodney W. Grimes 				*rp++ = fp;
1205426da3bcSAlfred Perlstein 				FILE_LOCK(fp);
1206df8bae1dSRodney W. Grimes 				fp->f_count++;
1207df8bae1dSRodney W. Grimes 				fp->f_msgcount++;
1208426da3bcSAlfred Perlstein 				FILE_UNLOCK(fp);
1209df8bae1dSRodney W. Grimes 				unp_rights++;
1210df8bae1dSRodney W. Grimes 			}
1211426da3bcSAlfred Perlstein 			FILEDESC_UNLOCK(fdescp);
12122bc21ed9SDavid Malone 			break;
12132bc21ed9SDavid Malone 
12142bc21ed9SDavid Malone 		case SCM_TIMESTAMP:
12152bc21ed9SDavid Malone 			*controlp = sbcreatecontrol(NULL, sizeof(*tv),
12162bc21ed9SDavid Malone 			    SCM_TIMESTAMP, SOL_SOCKET);
12172bc21ed9SDavid Malone 			if (*controlp == NULL) {
12182bc21ed9SDavid Malone 				error = ENOBUFS;
12192bc21ed9SDavid Malone 				goto out;
12208692c025SYoshinobu Inoue 			}
12212bc21ed9SDavid Malone 			tv = (struct timeval *)
12222bc21ed9SDavid Malone 			    CMSG_DATA(mtod(*controlp, struct cmsghdr *));
12232bc21ed9SDavid Malone 			microtime(tv);
12242bc21ed9SDavid Malone 			break;
12252bc21ed9SDavid Malone 
12262bc21ed9SDavid Malone 		default:
12272bc21ed9SDavid Malone 			error = EINVAL;
12282bc21ed9SDavid Malone 			goto out;
12292bc21ed9SDavid Malone 		}
12302bc21ed9SDavid Malone 
12312bc21ed9SDavid Malone 		controlp = &(*controlp)->m_next;
12322bc21ed9SDavid Malone 
12332bc21ed9SDavid Malone 		if (CMSG_SPACE(datalen) < clen) {
12342bc21ed9SDavid Malone 			clen -= CMSG_SPACE(datalen);
12352bc21ed9SDavid Malone 			cm = (struct cmsghdr *)
12362bc21ed9SDavid Malone 			    ((caddr_t)cm + CMSG_SPACE(datalen));
12372bc21ed9SDavid Malone 		} else {
12382bc21ed9SDavid Malone 			clen = 0;
12392bc21ed9SDavid Malone 			cm = NULL;
12402bc21ed9SDavid Malone 		}
12412bc21ed9SDavid Malone 	}
12422bc21ed9SDavid Malone 
12432bc21ed9SDavid Malone out:
12442bc21ed9SDavid Malone 	m_freem(control);
12452bc21ed9SDavid Malone 
12462bc21ed9SDavid Malone 	return (error);
1247df8bae1dSRodney W. Grimes }
1248df8bae1dSRodney W. Grimes 
1249f708ef1bSPoul-Henning Kamp static int	unp_defer, unp_gcing;
1250df8bae1dSRodney W. Grimes 
1251f708ef1bSPoul-Henning Kamp static void
1252df8bae1dSRodney W. Grimes unp_gc()
1253df8bae1dSRodney W. Grimes {
1254df8bae1dSRodney W. Grimes 	register struct file *fp, *nextfp;
1255df8bae1dSRodney W. Grimes 	register struct socket *so;
1256df8bae1dSRodney W. Grimes 	struct file **extra_ref, **fpp;
1257df8bae1dSRodney W. Grimes 	int nunref, i;
1258df8bae1dSRodney W. Grimes 
1259df8bae1dSRodney W. Grimes 	if (unp_gcing)
1260df8bae1dSRodney W. Grimes 		return;
1261df8bae1dSRodney W. Grimes 	unp_gcing = 1;
1262df8bae1dSRodney W. Grimes 	unp_defer = 0;
1263ed5b7817SJulian Elischer 	/*
1264ed5b7817SJulian Elischer 	 * before going through all this, set all FDs to
1265ed5b7817SJulian Elischer 	 * be NOT defered and NOT externally accessible
1266ed5b7817SJulian Elischer 	 */
1267426da3bcSAlfred Perlstein 	sx_slock(&filelist_lock);
12682e3c8fcbSPoul-Henning Kamp 	LIST_FOREACH(fp, &filehead, f_list)
1269426da3bcSAlfred Perlstein 		fp->f_gcflag &= ~(FMARK|FDEFER);
1270df8bae1dSRodney W. Grimes 	do {
12712e3c8fcbSPoul-Henning Kamp 		LIST_FOREACH(fp, &filehead, f_list) {
1272426da3bcSAlfred Perlstein 			FILE_LOCK(fp);
1273ed5b7817SJulian Elischer 			/*
1274ed5b7817SJulian Elischer 			 * If the file is not open, skip it
1275ed5b7817SJulian Elischer 			 */
1276426da3bcSAlfred Perlstein 			if (fp->f_count == 0) {
1277426da3bcSAlfred Perlstein 				FILE_UNLOCK(fp);
1278df8bae1dSRodney W. Grimes 				continue;
1279426da3bcSAlfred Perlstein 			}
1280ed5b7817SJulian Elischer 			/*
1281ed5b7817SJulian Elischer 			 * If we already marked it as 'defer'  in a
1282ed5b7817SJulian Elischer 			 * previous pass, then try process it this time
1283ed5b7817SJulian Elischer 			 * and un-mark it
1284ed5b7817SJulian Elischer 			 */
1285426da3bcSAlfred Perlstein 			if (fp->f_gcflag & FDEFER) {
1286426da3bcSAlfred Perlstein 				fp->f_gcflag &= ~FDEFER;
1287df8bae1dSRodney W. Grimes 				unp_defer--;
1288df8bae1dSRodney W. Grimes 			} else {
1289ed5b7817SJulian Elischer 				/*
1290ed5b7817SJulian Elischer 				 * if it's not defered, then check if it's
1291ed5b7817SJulian Elischer 				 * already marked.. if so skip it
1292ed5b7817SJulian Elischer 				 */
1293426da3bcSAlfred Perlstein 				if (fp->f_gcflag & FMARK) {
1294426da3bcSAlfred Perlstein 					FILE_UNLOCK(fp);
1295df8bae1dSRodney W. Grimes 					continue;
1296426da3bcSAlfred Perlstein 				}
1297ed5b7817SJulian Elischer 				/*
1298ed5b7817SJulian Elischer 				 * If all references are from messages
1299ed5b7817SJulian Elischer 				 * in transit, then skip it. it's not
1300ed5b7817SJulian Elischer 				 * externally accessible.
1301ed5b7817SJulian Elischer 				 */
1302426da3bcSAlfred Perlstein 				if (fp->f_count == fp->f_msgcount) {
1303426da3bcSAlfred Perlstein 					FILE_UNLOCK(fp);
1304df8bae1dSRodney W. Grimes 					continue;
1305426da3bcSAlfred Perlstein 				}
1306ed5b7817SJulian Elischer 				/*
1307ed5b7817SJulian Elischer 				 * If it got this far then it must be
1308ed5b7817SJulian Elischer 				 * externally accessible.
1309ed5b7817SJulian Elischer 				 */
1310426da3bcSAlfred Perlstein 				fp->f_gcflag |= FMARK;
1311df8bae1dSRodney W. Grimes 			}
1312ed5b7817SJulian Elischer 			/*
1313ed5b7817SJulian Elischer 			 * either it was defered, or it is externally
1314ed5b7817SJulian Elischer 			 * accessible and not already marked so.
1315ed5b7817SJulian Elischer 			 * Now check if it is possibly one of OUR sockets.
1316ed5b7817SJulian Elischer 			 */
1317df8bae1dSRodney W. Grimes 			if (fp->f_type != DTYPE_SOCKET ||
131848e3128bSMatthew Dillon 			    (so = fp->f_data) == NULL) {
1319426da3bcSAlfred Perlstein 				FILE_UNLOCK(fp);
1320df8bae1dSRodney W. Grimes 				continue;
1321426da3bcSAlfred Perlstein 			}
1322426da3bcSAlfred Perlstein 			FILE_UNLOCK(fp);
1323748e0b0aSGarrett Wollman 			if (so->so_proto->pr_domain != &localdomain ||
1324df8bae1dSRodney W. Grimes 			    (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1325df8bae1dSRodney W. Grimes 				continue;
1326df8bae1dSRodney W. Grimes #ifdef notdef
1327df8bae1dSRodney W. Grimes 			if (so->so_rcv.sb_flags & SB_LOCK) {
1328df8bae1dSRodney W. Grimes 				/*
1329df8bae1dSRodney W. Grimes 				 * This is problematical; it's not clear
1330df8bae1dSRodney W. Grimes 				 * we need to wait for the sockbuf to be
1331df8bae1dSRodney W. Grimes 				 * unlocked (on a uniprocessor, at least),
1332df8bae1dSRodney W. Grimes 				 * and it's also not clear what to do
1333df8bae1dSRodney W. Grimes 				 * if sbwait returns an error due to receipt
1334df8bae1dSRodney W. Grimes 				 * of a signal.  If sbwait does return
1335df8bae1dSRodney W. Grimes 				 * an error, we'll go into an infinite
1336df8bae1dSRodney W. Grimes 				 * loop.  Delete all of this for now.
1337df8bae1dSRodney W. Grimes 				 */
1338df8bae1dSRodney W. Grimes 				(void) sbwait(&so->so_rcv);
1339df8bae1dSRodney W. Grimes 				goto restart;
1340df8bae1dSRodney W. Grimes 			}
1341df8bae1dSRodney W. Grimes #endif
1342ed5b7817SJulian Elischer 			/*
1343ed5b7817SJulian Elischer 			 * So, Ok, it's one of our sockets and it IS externally
1344ed5b7817SJulian Elischer 			 * accessible (or was defered). Now we look
1345dc733423SDag-Erling Smørgrav 			 * to see if we hold any file descriptors in its
1346ed5b7817SJulian Elischer 			 * message buffers. Follow those links and mark them
1347ed5b7817SJulian Elischer 			 * as accessible too.
1348ed5b7817SJulian Elischer 			 */
1349df8bae1dSRodney W. Grimes 			unp_scan(so->so_rcv.sb_mb, unp_mark);
1350df8bae1dSRodney W. Grimes 		}
1351df8bae1dSRodney W. Grimes 	} while (unp_defer);
1352426da3bcSAlfred Perlstein 	sx_sunlock(&filelist_lock);
1353df8bae1dSRodney W. Grimes 	/*
1354df8bae1dSRodney W. Grimes 	 * We grab an extra reference to each of the file table entries
1355df8bae1dSRodney W. Grimes 	 * that are not otherwise accessible and then free the rights
1356df8bae1dSRodney W. Grimes 	 * that are stored in messages on them.
1357df8bae1dSRodney W. Grimes 	 *
1358df8bae1dSRodney W. Grimes 	 * The bug in the orginal code is a little tricky, so I'll describe
1359df8bae1dSRodney W. Grimes 	 * what's wrong with it here.
1360df8bae1dSRodney W. Grimes 	 *
1361df8bae1dSRodney W. Grimes 	 * It is incorrect to simply unp_discard each entry for f_msgcount
1362df8bae1dSRodney W. Grimes 	 * times -- consider the case of sockets A and B that contain
1363df8bae1dSRodney W. Grimes 	 * references to each other.  On a last close of some other socket,
1364df8bae1dSRodney W. Grimes 	 * we trigger a gc since the number of outstanding rights (unp_rights)
1365df8bae1dSRodney W. Grimes 	 * is non-zero.  If during the sweep phase the gc code un_discards,
1366df8bae1dSRodney W. Grimes 	 * we end up doing a (full) closef on the descriptor.  A closef on A
1367df8bae1dSRodney W. Grimes 	 * results in the following chain.  Closef calls soo_close, which
1368df8bae1dSRodney W. Grimes 	 * calls soclose.   Soclose calls first (through the switch
1369df8bae1dSRodney W. Grimes 	 * uipc_usrreq) unp_detach, which re-invokes unp_gc.  Unp_gc simply
1370df8bae1dSRodney W. Grimes 	 * returns because the previous instance had set unp_gcing, and
1371df8bae1dSRodney W. Grimes 	 * we return all the way back to soclose, which marks the socket
1372df8bae1dSRodney W. Grimes 	 * with SS_NOFDREF, and then calls sofree.  Sofree calls sorflush
1373df8bae1dSRodney W. Grimes 	 * to free up the rights that are queued in messages on the socket A,
1374df8bae1dSRodney W. Grimes 	 * i.e., the reference on B.  The sorflush calls via the dom_dispose
1375df8bae1dSRodney W. Grimes 	 * switch unp_dispose, which unp_scans with unp_discard.  This second
1376df8bae1dSRodney W. Grimes 	 * instance of unp_discard just calls closef on B.
1377df8bae1dSRodney W. Grimes 	 *
1378df8bae1dSRodney W. Grimes 	 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1379df8bae1dSRodney W. Grimes 	 * which results in another closef on A.  Unfortunately, A is already
1380df8bae1dSRodney W. Grimes 	 * being closed, and the descriptor has already been marked with
1381df8bae1dSRodney W. Grimes 	 * SS_NOFDREF, and soclose panics at this point.
1382df8bae1dSRodney W. Grimes 	 *
1383df8bae1dSRodney W. Grimes 	 * Here, we first take an extra reference to each inaccessible
1384df8bae1dSRodney W. Grimes 	 * descriptor.  Then, we call sorflush ourself, since we know
1385df8bae1dSRodney W. Grimes 	 * it is a Unix domain socket anyhow.  After we destroy all the
1386df8bae1dSRodney W. Grimes 	 * rights carried in messages, we do a last closef to get rid
1387df8bae1dSRodney W. Grimes 	 * of our extra reference.  This is the last close, and the
1388df8bae1dSRodney W. Grimes 	 * unp_detach etc will shut down the socket.
1389df8bae1dSRodney W. Grimes 	 *
1390df8bae1dSRodney W. Grimes 	 * 91/09/19, bsy@cs.cmu.edu
1391df8bae1dSRodney W. Grimes 	 */
1392a163d034SWarner Losh 	extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK);
1393426da3bcSAlfred Perlstein 	sx_slock(&filelist_lock);
13942e3c8fcbSPoul-Henning Kamp 	for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1395bc6f0e79SJeffrey Hsu 	    fp = nextfp) {
13962e3c8fcbSPoul-Henning Kamp 		nextfp = LIST_NEXT(fp, f_list);
1397426da3bcSAlfred Perlstein 		FILE_LOCK(fp);
1398ed5b7817SJulian Elischer 		/*
1399ed5b7817SJulian Elischer 		 * If it's not open, skip it
1400ed5b7817SJulian Elischer 		 */
1401426da3bcSAlfred Perlstein 		if (fp->f_count == 0) {
1402426da3bcSAlfred Perlstein 			FILE_UNLOCK(fp);
1403df8bae1dSRodney W. Grimes 			continue;
1404426da3bcSAlfred Perlstein 		}
1405ed5b7817SJulian Elischer 		/*
1406ed5b7817SJulian Elischer 		 * If all refs are from msgs, and it's not marked accessible
1407ed5b7817SJulian Elischer 		 * then it must be referenced from some unreachable cycle
1408ed5b7817SJulian Elischer 		 * of (shut-down) FDs, so include it in our
1409ed5b7817SJulian Elischer 		 * list of FDs to remove
1410ed5b7817SJulian Elischer 		 */
1411426da3bcSAlfred Perlstein 		if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) {
1412df8bae1dSRodney W. Grimes 			*fpp++ = fp;
1413df8bae1dSRodney W. Grimes 			nunref++;
1414df8bae1dSRodney W. Grimes 			fp->f_count++;
1415df8bae1dSRodney W. Grimes 		}
1416426da3bcSAlfred Perlstein 		FILE_UNLOCK(fp);
1417df8bae1dSRodney W. Grimes 	}
1418426da3bcSAlfred Perlstein 	sx_sunlock(&filelist_lock);
1419ed5b7817SJulian Elischer 	/*
1420ed5b7817SJulian Elischer 	 * for each FD on our hit list, do the following two things
1421ed5b7817SJulian Elischer 	 */
14221c7c3c6aSMatthew Dillon 	for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
14231c7c3c6aSMatthew Dillon 		struct file *tfp = *fpp;
1424426da3bcSAlfred Perlstein 		FILE_LOCK(tfp);
1425cd72f218SMatthew Dillon 		if (tfp->f_type == DTYPE_SOCKET &&
142648e3128bSMatthew Dillon 		    tfp->f_data != NULL) {
1427426da3bcSAlfred Perlstein 			FILE_UNLOCK(tfp);
142848e3128bSMatthew Dillon 			sorflush(tfp->f_data);
1429e5aeaa0cSDag-Erling Smørgrav 		} else {
1430426da3bcSAlfred Perlstein 			FILE_UNLOCK(tfp);
14311c7c3c6aSMatthew Dillon 		}
1432e5aeaa0cSDag-Erling Smørgrav 	}
1433df8bae1dSRodney W. Grimes 	for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
1434b40ce416SJulian Elischer 		closef(*fpp, (struct thread *) NULL);
1435210a5a71SAlfred Perlstein 	free(extra_ref, M_TEMP);
1436df8bae1dSRodney W. Grimes 	unp_gcing = 0;
1437df8bae1dSRodney W. Grimes }
1438df8bae1dSRodney W. Grimes 
143926f9a767SRodney W. Grimes void
1440df8bae1dSRodney W. Grimes unp_dispose(m)
1441df8bae1dSRodney W. Grimes 	struct mbuf *m;
1442df8bae1dSRodney W. Grimes {
1443996c772fSJohn Dyson 
1444df8bae1dSRodney W. Grimes 	if (m)
1445df8bae1dSRodney W. Grimes 		unp_scan(m, unp_discard);
1446df8bae1dSRodney W. Grimes }
1447df8bae1dSRodney W. Grimes 
14480c1bb4fbSDima Dorfman static int
14496f105b34SJohn Baldwin unp_listen(unp, td)
14500c1bb4fbSDima Dorfman 	struct unpcb *unp;
14516f105b34SJohn Baldwin 	struct thread *td;
14520c1bb4fbSDima Dorfman {
14530c1bb4fbSDima Dorfman 
14546f105b34SJohn Baldwin 	cru2x(td->td_ucred, &unp->unp_peercred);
14550c1bb4fbSDima Dorfman 	unp->unp_flags |= UNP_HAVEPCCACHED;
14560c1bb4fbSDima Dorfman 	return (0);
14570c1bb4fbSDima Dorfman }
14580c1bb4fbSDima Dorfman 
1459f708ef1bSPoul-Henning Kamp static void
1460df8bae1dSRodney W. Grimes unp_scan(m0, op)
1461df8bae1dSRodney W. Grimes 	register struct mbuf *m0;
14624d77a549SAlfred Perlstein 	void (*op)(struct file *);
1463df8bae1dSRodney W. Grimes {
14642bc21ed9SDavid Malone 	struct mbuf *m;
14652bc21ed9SDavid Malone 	struct file **rp;
14662bc21ed9SDavid Malone 	struct cmsghdr *cm;
14672bc21ed9SDavid Malone 	void *data;
14682bc21ed9SDavid Malone 	int i;
14692bc21ed9SDavid Malone 	socklen_t clen, datalen;
1470df8bae1dSRodney W. Grimes 	int qfds;
1471df8bae1dSRodney W. Grimes 
1472df8bae1dSRodney W. Grimes 	while (m0) {
14732bc21ed9SDavid Malone 		for (m = m0; m; m = m->m_next) {
147412396bdcSDavid Malone 			if (m->m_type != MT_CONTROL)
1475df8bae1dSRodney W. Grimes 				continue;
14762bc21ed9SDavid Malone 
14772bc21ed9SDavid Malone 			cm = mtod(m, struct cmsghdr *);
14782bc21ed9SDavid Malone 			clen = m->m_len;
14792bc21ed9SDavid Malone 
14802bc21ed9SDavid Malone 			while (cm != NULL) {
14812bc21ed9SDavid Malone 				if (sizeof(*cm) > clen || cm->cmsg_len > clen)
14822bc21ed9SDavid Malone 					break;
14832bc21ed9SDavid Malone 
14842bc21ed9SDavid Malone 				data = CMSG_DATA(cm);
14852bc21ed9SDavid Malone 				datalen = (caddr_t)cm + cm->cmsg_len
14862bc21ed9SDavid Malone 				    - (caddr_t)data;
14872bc21ed9SDavid Malone 
14882bc21ed9SDavid Malone 				if (cm->cmsg_level == SOL_SOCKET &&
14892bc21ed9SDavid Malone 				    cm->cmsg_type == SCM_RIGHTS) {
14902bc21ed9SDavid Malone 					qfds = datalen / sizeof (struct file *);
14912bc21ed9SDavid Malone 					rp = data;
1492df8bae1dSRodney W. Grimes 					for (i = 0; i < qfds; i++)
1493df8bae1dSRodney W. Grimes 						(*op)(*rp++);
14942bc21ed9SDavid Malone 				}
14952bc21ed9SDavid Malone 
14962bc21ed9SDavid Malone 				if (CMSG_SPACE(datalen) < clen) {
14972bc21ed9SDavid Malone 					clen -= CMSG_SPACE(datalen);
14982bc21ed9SDavid Malone 					cm = (struct cmsghdr *)
14992bc21ed9SDavid Malone 					    ((caddr_t)cm + CMSG_SPACE(datalen));
15002bc21ed9SDavid Malone 				} else {
15012bc21ed9SDavid Malone 					clen = 0;
15022bc21ed9SDavid Malone 					cm = NULL;
15032bc21ed9SDavid Malone 				}
15042bc21ed9SDavid Malone 			}
1505df8bae1dSRodney W. Grimes 		}
1506df8bae1dSRodney W. Grimes 		m0 = m0->m_act;
1507df8bae1dSRodney W. Grimes 	}
1508df8bae1dSRodney W. Grimes }
1509df8bae1dSRodney W. Grimes 
1510f708ef1bSPoul-Henning Kamp static void
1511df8bae1dSRodney W. Grimes unp_mark(fp)
1512df8bae1dSRodney W. Grimes 	struct file *fp;
1513df8bae1dSRodney W. Grimes {
1514426da3bcSAlfred Perlstein 	if (fp->f_gcflag & FMARK)
1515df8bae1dSRodney W. Grimes 		return;
1516df8bae1dSRodney W. Grimes 	unp_defer++;
1517426da3bcSAlfred Perlstein 	fp->f_gcflag |= (FMARK|FDEFER);
1518df8bae1dSRodney W. Grimes }
1519df8bae1dSRodney W. Grimes 
1520f708ef1bSPoul-Henning Kamp static void
1521df8bae1dSRodney W. Grimes unp_discard(fp)
1522df8bae1dSRodney W. Grimes 	struct file *fp;
1523df8bae1dSRodney W. Grimes {
1524426da3bcSAlfred Perlstein 	FILE_LOCK(fp);
1525df8bae1dSRodney W. Grimes 	fp->f_msgcount--;
1526df8bae1dSRodney W. Grimes 	unp_rights--;
1527426da3bcSAlfred Perlstein 	FILE_UNLOCK(fp);
1528b40ce416SJulian Elischer 	(void) closef(fp, (struct thread *)NULL);
1529df8bae1dSRodney W. Grimes }
1530