1 /*
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
34 * $FreeBSD: releng/5.1/sys/kern/uipc_usrreq.c 112516 2003-03-23 19:41:34Z cognet $
35 */
36
37 #include "opt_mac.h"
38
39 #include <sys/param.h>
40 #include <sys/domain.h>
41 #include <sys/fcntl.h>
42 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */
43 #include <sys/file.h>
44 #include <sys/filedesc.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/lock.h>
48 #include <sys/mac.h>
49 #include <sys/mbuf.h>
50 #include <sys/mutex.h>
51 #include <sys/namei.h>
52 #include <sys/proc.h>
53 #include <sys/protosw.h>
54 #include <sys/resourcevar.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/signalvar.h>
58 #include <sys/stat.h>
59 #include <sys/sx.h>
60 #include <sys/sysctl.h>
61 #include <sys/systm.h>
62 #include <sys/un.h>
63 #include <sys/unpcb.h>
64 #include <sys/vnode.h>
65
66 #include <vm/uma.h>
67
68 static uma_zone_t unp_zone;
69 static unp_gen_t unp_gencnt;
70 static u_int unp_count;
71
72 static struct unp_head unp_shead, unp_dhead;
73
74 /*
75 * Unix communications domain.
76 *
77 * TODO:
78 * SEQPACKET, RDM
79 * rethink name space problems
80 * need a proper out-of-band
81 * lock pushdown
82 */
83 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
84 static ino_t unp_ino; /* prototype for fake inode numbers */
85
86 static int unp_attach(struct socket *);
87 static void unp_detach(struct unpcb *);
88 static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *);
89 static int unp_connect(struct socket *,struct sockaddr *, struct thread *);
90 static void unp_disconnect(struct unpcb *);
91 static void unp_shutdown(struct unpcb *);
92 static void unp_drop(struct unpcb *, int);
93 static void unp_gc(void);
94 static void unp_scan(struct mbuf *, void (*)(struct file *));
95 static void unp_mark(struct file *);
96 static void unp_discard(struct file *);
97 static void unp_freerights(struct file **, int);
98 static int unp_internalize(struct mbuf **, struct thread *);
99 static int unp_listen(struct unpcb *, struct thread *);
100
101 static int
102 uipc_abort(struct socket *so)
103 {
104 struct unpcb *unp = sotounpcb(so);
105
106 if (unp == 0)
107 return EINVAL;
108 unp_drop(unp, ECONNABORTED);
109 unp_detach(unp);
110 sotryfree(so);
111 return 0;
112 }
113
114 static int
115 uipc_accept(struct socket *so, struct sockaddr **nam)
116 {
117 struct unpcb *unp = sotounpcb(so);
118
119 if (unp == 0)
120 return EINVAL;
121
122 /*
123 * Pass back name of connected socket,
124 * if it was bound and we are still connected
125 * (our peer may have closed already!).
126 */
127 if (unp->unp_conn && unp->unp_conn->unp_addr) {
128 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
129 1);
130 } else {
131 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
132 }
133 return 0;
134 }
135
136 static int
137 uipc_attach(struct socket *so, int proto, struct thread *td)
138 {
139 struct unpcb *unp = sotounpcb(so);
140
141 if (unp != 0)
142 return EISCONN;
143 return unp_attach(so);
144 }
145
146 static int
147 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
148 {
149 struct unpcb *unp = sotounpcb(so);
150
151 if (unp == 0)
152 return EINVAL;
153
154 return unp_bind(unp, nam, td);
155 }
156
157 static int
158 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
159 {
160 struct unpcb *unp = sotounpcb(so);
161
162 if (unp == 0)
163 return EINVAL;
164 return unp_connect(so, nam, curthread);
165 }
166
167 static int
168 uipc_connect2(struct socket *so1, struct socket *so2)
169 {
170 struct unpcb *unp = sotounpcb(so1);
171
172 if (unp == 0)
173 return EINVAL;
174
175 return unp_connect2(so1, so2);
176 }
177
178 /* control is EOPNOTSUPP */
179
180 static int
181 uipc_detach(struct socket *so)
182 {
183 struct unpcb *unp = sotounpcb(so);
184
185 if (unp == 0)
186 return EINVAL;
187
188 unp_detach(unp);
189 return 0;
190 }
191
192 static int
193 uipc_disconnect(struct socket *so)
194 {
195 struct unpcb *unp = sotounpcb(so);
196
197 if (unp == 0)
198 return EINVAL;
199 unp_disconnect(unp);
200 return 0;
201 }
202
203 static int
204 uipc_listen(struct socket *so, struct thread *td)
205 {
206 struct unpcb *unp = sotounpcb(so);
207
208 if (unp == 0 || unp->unp_vnode == 0)
209 return EINVAL;
210 return unp_listen(unp, td);
211 }
212
213 static int
214 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
215 {
216 struct unpcb *unp = sotounpcb(so);
217
218 if (unp == 0)
219 return EINVAL;
220 if (unp->unp_conn && unp->unp_conn->unp_addr)
221 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
222 1);
223 else {
224 /*
225 * XXX: It seems that this test always fails even when
226 * connection is established. So, this else clause is
227 * added as workaround to return PF_LOCAL sockaddr.
228 */
229 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
230 }
231 return 0;
232 }
233
234 static int
235 uipc_rcvd(struct socket *so, int flags)
236 {
237 struct unpcb *unp = sotounpcb(so);
238 struct socket *so2;
239 u_long newhiwat;
240
241 if (unp == 0)
242 return EINVAL;
243 switch (so->so_type) {
244 case SOCK_DGRAM:
245 panic("uipc_rcvd DGRAM?");
246 /*NOTREACHED*/
247
248 case SOCK_STREAM:
249 if (unp->unp_conn == 0)
250 break;
251 so2 = unp->unp_conn->unp_socket;
252 /*
253 * Adjust backpressure on sender
254 * and wakeup any waiting to write.
255 */
256 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
257 unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
258 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
259 so->so_rcv.sb_cc;
260 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
261 newhiwat, RLIM_INFINITY);
262 unp->unp_cc = so->so_rcv.sb_cc;
263 sowwakeup(so2);
264 break;
265
266 default:
267 panic("uipc_rcvd unknown socktype");
268 }
269 return 0;
270 }
271
272 /* pru_rcvoob is EOPNOTSUPP */
273
274 static int
275 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
276 struct mbuf *control, struct thread *td)
277 {
278 int error = 0;
279 struct unpcb *unp = sotounpcb(so);
280 struct socket *so2;
281 u_long newhiwat;
282
283 if (unp == 0) {
284 error = EINVAL;
285 goto release;
286 }
287 if (flags & PRUS_OOB) {
288 error = EOPNOTSUPP;
289 goto release;
290 }
291
292 if (control && (error = unp_internalize(&control, td)))
293 goto release;
294
295 switch (so->so_type) {
296 case SOCK_DGRAM:
297 {
298 struct sockaddr *from;
299
300 if (nam) {
301 if (unp->unp_conn) {
302 error = EISCONN;
303 break;
304 }
305 error = unp_connect(so, nam, td);
306 if (error)
307 break;
308 } else {
309 if (unp->unp_conn == 0) {
310 error = ENOTCONN;
311 break;
312 }
313 }
314 so2 = unp->unp_conn->unp_socket;
315 if (unp->unp_addr)
316 from = (struct sockaddr *)unp->unp_addr;
317 else
318 from = &sun_noname;
319 if (sbappendaddr(&so2->so_rcv, from, m, control)) {
320 sorwakeup(so2);
321 m = 0;
322 control = 0;
323 } else
324 error = ENOBUFS;
325 if (nam)
326 unp_disconnect(unp);
327 break;
328 }
329
330 case SOCK_STREAM:
331 /* Connect if not connected yet. */
332 /*
333 * Note: A better implementation would complain
334 * if not equal to the peer's address.
335 */
336 if ((so->so_state & SS_ISCONNECTED) == 0) {
337 if (nam) {
338 error = unp_connect(so, nam, td);
339 if (error)
340 break; /* XXX */
341 } else {
342 error = ENOTCONN;
343 break;
344 }
345 }
346
347 if (so->so_state & SS_CANTSENDMORE) {
348 error = EPIPE;
349 break;
350 }
351 if (unp->unp_conn == 0)
352 panic("uipc_send connected but no connection?");
353 so2 = unp->unp_conn->unp_socket;
354 /*
355 * Send to paired receive port, and then reduce
356 * send buffer hiwater marks to maintain backpressure.
357 * Wake up readers.
358 */
359 if (control) {
360 if (sbappendcontrol(&so2->so_rcv, m, control))
361 control = 0;
362 } else
363 sbappend(&so2->so_rcv, m);
364 so->so_snd.sb_mbmax -=
365 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
366 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
367 newhiwat = so->so_snd.sb_hiwat -
368 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
369 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
370 newhiwat, RLIM_INFINITY);
371 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
372 sorwakeup(so2);
373 m = 0;
374 break;
375
376 default:
377 panic("uipc_send unknown socktype");
378 }
379
380 /*
381 * SEND_EOF is equivalent to a SEND followed by
382 * a SHUTDOWN.
383 */
384 if (flags & PRUS_EOF) {
385 socantsendmore(so);
386 unp_shutdown(unp);
387 }
388
389 if (control && error != 0)
390 unp_dispose(control);
391
392 release:
393 if (control)
394 m_freem(control);
395 if (m)
396 m_freem(m);
397 return error;
398 }
399
400 static int
401 uipc_sense(struct socket *so, struct stat *sb)
402 {
403 struct unpcb *unp = sotounpcb(so);
404 struct socket *so2;
405
406 if (unp == 0)
407 return EINVAL;
408 sb->st_blksize = so->so_snd.sb_hiwat;
409 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
410 so2 = unp->unp_conn->unp_socket;
411 sb->st_blksize += so2->so_rcv.sb_cc;
412 }
413 sb->st_dev = NOUDEV;
414 if (unp->unp_ino == 0)
415 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
416 sb->st_ino = unp->unp_ino;
417 return (0);
418 }
419
420 static int
421 uipc_shutdown(struct socket *so)
422 {
423 struct unpcb *unp = sotounpcb(so);
424
425 if (unp == 0)
426 return EINVAL;
427 socantsendmore(so);
428 unp_shutdown(unp);
429 return 0;
430 }
431
432 static int
433 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
434 {
435 struct unpcb *unp = sotounpcb(so);
436
437 if (unp == 0)
438 return EINVAL;
439 if (unp->unp_addr)
440 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
441 else
442 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
443 return 0;
444 }
445
446 struct pr_usrreqs uipc_usrreqs = {
447 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
448 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
449 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
450 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
451 sosend, soreceive, sopoll
452 };
453
454 int
455 uipc_ctloutput(so, sopt)
456 struct socket *so;
457 struct sockopt *sopt;
458 {
459 struct unpcb *unp = sotounpcb(so);
460 int error;
461
462 switch (sopt->sopt_dir) {
463 case SOPT_GET:
464 switch (sopt->sopt_name) {
465 case LOCAL_PEERCRED:
466 if (unp->unp_flags & UNP_HAVEPC)
467 error = sooptcopyout(sopt, &unp->unp_peercred,
468 sizeof(unp->unp_peercred));
469 else {
470 if (so->so_type == SOCK_STREAM)
471 error = ENOTCONN;
472 else
473 error = EINVAL;
474 }
475 break;
476 default:
477 error = EOPNOTSUPP;
478 break;
479 }
480 break;
481 case SOPT_SET:
482 default:
483 error = EOPNOTSUPP;
484 break;
485 }
486 return (error);
487 }
488
489 /*
490 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
491 * for stream sockets, although the total for sender and receiver is
492 * actually only PIPSIZ.
493 * Datagram sockets really use the sendspace as the maximum datagram size,
494 * and don't really want to reserve the sendspace. Their recvspace should
495 * be large enough for at least one max-size datagram plus address.
496 */
497 #ifndef PIPSIZ
498 #define PIPSIZ 8192
499 #endif
500 static u_long unpst_sendspace = PIPSIZ;
501 static u_long unpst_recvspace = PIPSIZ;
502 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
503 static u_long unpdg_recvspace = 4*1024;
504
505 static int unp_rights; /* file descriptors in flight */
506
507 SYSCTL_DECL(_net_local_stream);
508 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
509 &unpst_sendspace, 0, "");
510 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
511 &unpst_recvspace, 0, "");
512 SYSCTL_DECL(_net_local_dgram);
513 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
514 &unpdg_sendspace, 0, "");
515 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
516 &unpdg_recvspace, 0, "");
517 SYSCTL_DECL(_net_local);
518 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
519
520 static int
521 unp_attach(so)
522 struct socket *so;
523 {
524 register struct unpcb *unp;
525 int error;
526
527 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
528 switch (so->so_type) {
529
530 case SOCK_STREAM:
531 error = soreserve(so, unpst_sendspace, unpst_recvspace);
532 break;
533
534 case SOCK_DGRAM:
535 error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
536 break;
537
538 default:
539 panic("unp_attach");
540 }
541 if (error)
542 return (error);
543 }
544 unp = uma_zalloc(unp_zone, M_WAITOK);
545 if (unp == NULL)
546 return (ENOBUFS);
547 bzero(unp, sizeof *unp);
548 unp->unp_gencnt = ++unp_gencnt;
549 unp_count++;
550 LIST_INIT(&unp->unp_refs);
551 unp->unp_socket = so;
552 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
553 : &unp_shead, unp, unp_link);
554 so->so_pcb = unp;
555 return (0);
556 }
557
558 static void
559 unp_detach(unp)
560 register struct unpcb *unp;
561 {
562 LIST_REMOVE(unp, unp_link);
563 unp->unp_gencnt = ++unp_gencnt;
564 --unp_count;
565 if (unp->unp_vnode) {
566 unp->unp_vnode->v_socket = 0;
567 vrele(unp->unp_vnode);
568 unp->unp_vnode = 0;
569 }
570 if (unp->unp_conn)
571 unp_disconnect(unp);
572 while (!LIST_EMPTY(&unp->unp_refs))
573 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
574 soisdisconnected(unp->unp_socket);
575 unp->unp_socket->so_pcb = 0;
576 if (unp_rights) {
577 /*
578 * Normally the receive buffer is flushed later,
579 * in sofree, but if our receive buffer holds references
580 * to descriptors that are now garbage, we will dispose
581 * of those descriptor references after the garbage collector
582 * gets them (resulting in a "panic: closef: count < 0").
583 */
584 sorflush(unp->unp_socket);
585 unp_gc();
586 }
587 if (unp->unp_addr)
588 FREE(unp->unp_addr, M_SONAME);
589 uma_zfree(unp_zone, unp);
590 }
591
592 static int
593 unp_bind(unp, nam, td)
594 struct unpcb *unp;
595 struct sockaddr *nam;
596 struct thread *td;
597 {
598 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
599 struct vnode *vp;
600 struct mount *mp;
601 struct vattr vattr;
602 int error, namelen;
603 struct nameidata nd;
604 char *buf;
605
606 if (unp->unp_vnode != NULL)
607 return (EINVAL);
608
609 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
610 if (namelen <= 0)
611 return EINVAL;
612
613 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
614 strlcpy(buf, soun->sun_path, namelen + 1);
615
616 restart:
617 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE,
618 buf, td);
619 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
620 error = namei(&nd);
621 if (error) {
622 free(buf, M_TEMP);
623 return (error);
624 }
625 vp = nd.ni_vp;
626 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
627 NDFREE(&nd, NDF_ONLY_PNBUF);
628 if (nd.ni_dvp == vp)
629 vrele(nd.ni_dvp);
630 else
631 vput(nd.ni_dvp);
632 if (vp != NULL) {
633 vrele(vp);
634 free(buf, M_TEMP);
635 return (EADDRINUSE);
636 }
637 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
638 if (error) {
639 free(buf, M_TEMP);
640 return (error);
641 }
642 goto restart;
643 }
644 VATTR_NULL(&vattr);
645 vattr.va_type = VSOCK;
646 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
647 #ifdef MAC
648 error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
649 &vattr);
650 #endif
651 if (error == 0) {
652 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
653 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
654 }
655 NDFREE(&nd, NDF_ONLY_PNBUF);
656 vput(nd.ni_dvp);
657 if (error) {
658 free(buf, M_TEMP);
659 return (error);
660 }
661 vp = nd.ni_vp;
662 vp->v_socket = unp->unp_socket;
663 unp->unp_vnode = vp;
664 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
665 VOP_UNLOCK(vp, 0, td);
666 vn_finished_write(mp);
667 free(buf, M_TEMP);
668 return (0);
669 }
670
671 static int
672 unp_connect(so, nam, td)
673 struct socket *so;
674 struct sockaddr *nam;
675 struct thread *td;
676 {
677 register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
678 register struct vnode *vp;
679 register struct socket *so2, *so3;
680 struct unpcb *unp, *unp2, *unp3;
681 int error, len;
682 struct nameidata nd;
683 char buf[SOCK_MAXADDRLEN];
684
685 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
686 if (len <= 0)
687 return EINVAL;
688 strlcpy(buf, soun->sun_path, len + 1);
689
690 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
691 error = namei(&nd);
692 if (error)
693 return (error);
694 vp = nd.ni_vp;
695 NDFREE(&nd, NDF_ONLY_PNBUF);
696 if (vp->v_type != VSOCK) {
697 error = ENOTSOCK;
698 goto bad;
699 }
700 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
701 if (error)
702 goto bad;
703 so2 = vp->v_socket;
704 if (so2 == 0) {
705 error = ECONNREFUSED;
706 goto bad;
707 }
708 if (so->so_type != so2->so_type) {
709 error = EPROTOTYPE;
710 goto bad;
711 }
712 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
713 if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
714 (so3 = sonewconn(so2, 0)) == 0) {
715 error = ECONNREFUSED;
716 goto bad;
717 }
718 unp = sotounpcb(so);
719 unp2 = sotounpcb(so2);
720 unp3 = sotounpcb(so3);
721 if (unp2->unp_addr)
722 unp3->unp_addr = (struct sockaddr_un *)
723 dup_sockaddr((struct sockaddr *)
724 unp2->unp_addr, 1);
725
726 /*
727 * unp_peercred management:
728 *
729 * The connecter's (client's) credentials are copied
730 * from its process structure at the time of connect()
731 * (which is now).
732 */
733 cru2x(td->td_ucred, &unp3->unp_peercred);
734 unp3->unp_flags |= UNP_HAVEPC;
735 /*
736 * The receiver's (server's) credentials are copied
737 * from the unp_peercred member of socket on which the
738 * former called listen(); unp_listen() cached that
739 * process's credentials at that time so we can use
740 * them now.
741 */
742 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
743 ("unp_connect: listener without cached peercred"));
744 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
745 sizeof(unp->unp_peercred));
746 unp->unp_flags |= UNP_HAVEPC;
747 #ifdef MAC
748 mac_set_socket_peer_from_socket(so, so3);
749 mac_set_socket_peer_from_socket(so3, so);
750 #endif
751
752 so2 = so3;
753 }
754 error = unp_connect2(so, so2);
755 bad:
756 vput(vp);
757 return (error);
758 }
759
760 int
761 unp_connect2(so, so2)
762 register struct socket *so;
763 register struct socket *so2;
764 {
765 register struct unpcb *unp = sotounpcb(so);
766 register struct unpcb *unp2;
767
768 if (so2->so_type != so->so_type)
769 return (EPROTOTYPE);
770 unp2 = sotounpcb(so2);
771 unp->unp_conn = unp2;
772 switch (so->so_type) {
773
774 case SOCK_DGRAM:
775 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
776 soisconnected(so);
777 break;
778
779 case SOCK_STREAM:
780 unp2->unp_conn = unp;
781 soisconnected(so);
782 soisconnected(so2);
783 break;
784
785 default:
786 panic("unp_connect2");
787 }
788 return (0);
789 }
790
791 static void
792 unp_disconnect(unp)
793 struct unpcb *unp;
794 {
795 register struct unpcb *unp2 = unp->unp_conn;
796
797 if (unp2 == 0)
798 return;
799 unp->unp_conn = 0;
800 switch (unp->unp_socket->so_type) {
801
802 case SOCK_DGRAM:
803 LIST_REMOVE(unp, unp_reflink);
804 unp->unp_socket->so_state &= ~SS_ISCONNECTED;
805 break;
806
807 case SOCK_STREAM:
808 soisdisconnected(unp->unp_socket);
809 unp2->unp_conn = 0;
810 soisdisconnected(unp2->unp_socket);
811 break;
812 }
813 }
814
815 #ifdef notdef
816 void
817 unp_abort(unp)
818 struct unpcb *unp;
819 {
820
821 unp_detach(unp);
822 }
823 #endif
824
825 static int
826 unp_pcblist(SYSCTL_HANDLER_ARGS)
827 {
828 int error, i, n;
829 struct unpcb *unp, **unp_list;
830 unp_gen_t gencnt;
831 struct xunpgen *xug;
832 struct unp_head *head;
833 struct xunpcb *xu;
834
835 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
836
837 /*
838 * The process of preparing the PCB list is too time-consuming and
839 * resource-intensive to repeat twice on every request.
840 */
841 if (req->oldptr == 0) {
842 n = unp_count;
843 req->oldidx = 2 * (sizeof *xug)
844 + (n + n/8) * sizeof(struct xunpcb);
845 return 0;
846 }
847
848 if (req->newptr != 0)
849 return EPERM;
850
851 /*
852 * OK, now we're committed to doing something.
853 */
854 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
855 gencnt = unp_gencnt;
856 n = unp_count;
857
858 xug->xug_len = sizeof *xug;
859 xug->xug_count = n;
860 xug->xug_gen = gencnt;
861 xug->xug_sogen = so_gencnt;
862 error = SYSCTL_OUT(req, xug, sizeof *xug);
863 if (error) {
864 free(xug, M_TEMP);
865 return error;
866 }
867
868 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
869
870 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
871 unp = LIST_NEXT(unp, unp_link)) {
872 if (unp->unp_gencnt <= gencnt) {
873 if (cr_cansee(req->td->td_ucred,
874 unp->unp_socket->so_cred))
875 continue;
876 unp_list[i++] = unp;
877 }
878 }
879 n = i; /* in case we lost some during malloc */
880
881 error = 0;
882 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
883 for (i = 0; i < n; i++) {
884 unp = unp_list[i];
885 if (unp->unp_gencnt <= gencnt) {
886 xu->xu_len = sizeof *xu;
887 xu->xu_unpp = unp;
888 /*
889 * XXX - need more locking here to protect against
890 * connect/disconnect races for SMP.
891 */
892 if (unp->unp_addr)
893 bcopy(unp->unp_addr, &xu->xu_addr,
894 unp->unp_addr->sun_len);
895 if (unp->unp_conn && unp->unp_conn->unp_addr)
896 bcopy(unp->unp_conn->unp_addr,
897 &xu->xu_caddr,
898 unp->unp_conn->unp_addr->sun_len);
899 bcopy(unp, &xu->xu_unp, sizeof *unp);
900 sotoxsocket(unp->unp_socket, &xu->xu_socket);
901 error = SYSCTL_OUT(req, xu, sizeof *xu);
902 }
903 }
904 free(xu, M_TEMP);
905 if (!error) {
906 /*
907 * Give the user an updated idea of our state.
908 * If the generation differs from what we told
909 * her before, she knows that something happened
910 * while we were processing this request, and it
911 * might be necessary to retry.
912 */
913 xug->xug_gen = unp_gencnt;
914 xug->xug_sogen = so_gencnt;
915 xug->xug_count = unp_count;
916 error = SYSCTL_OUT(req, xug, sizeof *xug);
917 }
918 free(unp_list, M_TEMP);
919 free(xug, M_TEMP);
920 return error;
921 }
922
923 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
924 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
925 "List of active local datagram sockets");
926 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
927 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
928 "List of active local stream sockets");
929
930 static void
931 unp_shutdown(unp)
932 struct unpcb *unp;
933 {
934 struct socket *so;
935
936 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
937 (so = unp->unp_conn->unp_socket))
938 socantrcvmore(so);
939 }
940
941 static void
942 unp_drop(unp, errno)
943 struct unpcb *unp;
944 int errno;
945 {
946 struct socket *so = unp->unp_socket;
947
948 so->so_error = errno;
949 unp_disconnect(unp);
950 }
951
952 #ifdef notdef
953 void
954 unp_drain()
955 {
956
957 }
958 #endif
959
960 static void
961 unp_freerights(rp, fdcount)
962 struct file **rp;
963 int fdcount;
964 {
965 int i;
966 struct file *fp;
967
968 for (i = 0; i < fdcount; i++) {
969 fp = *rp;
970 /*
971 * zero the pointer before calling
972 * unp_discard since it may end up
973 * in unp_gc()..
974 */
975 *rp++ = 0;
976 unp_discard(fp);
977 }
978 }
979
980 int
981 unp_externalize(control, controlp)
982 struct mbuf *control, **controlp;
983 {
984 struct thread *td = curthread; /* XXX */
985 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
986 int i;
987 int *fdp;
988 struct file **rp;
989 struct file *fp;
990 void *data;
991 socklen_t clen = control->m_len, datalen;
992 int error, newfds;
993 int f;
994 u_int newlen;
995
996 error = 0;
997 if (controlp != NULL) /* controlp == NULL => free control messages */
998 *controlp = NULL;
999
1000 while (cm != NULL) {
1001 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1002 error = EINVAL;
1003 break;
1004 }
1005
1006 data = CMSG_DATA(cm);
1007 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1008
1009 if (cm->cmsg_level == SOL_SOCKET
1010 && cm->cmsg_type == SCM_RIGHTS) {
1011 newfds = datalen / sizeof(struct file *);
1012 rp = data;
1013
1014 /* If we're not outputting the descriptors free them. */
1015 if (error || controlp == NULL) {
1016 unp_freerights(rp, newfds);
1017 goto next;
1018 }
1019 FILEDESC_LOCK(td->td_proc->p_fd);
1020 /* if the new FD's will not fit free them. */
1021 if (!fdavail(td, newfds)) {
1022 FILEDESC_UNLOCK(td->td_proc->p_fd);
1023 error = EMSGSIZE;
1024 unp_freerights(rp, newfds);
1025 goto next;
1026 }
1027 /*
1028 * now change each pointer to an fd in the global
1029 * table to an integer that is the index to the
1030 * local fd table entry that we set up to point
1031 * to the global one we are transferring.
1032 */
1033 newlen = newfds * sizeof(int);
1034 *controlp = sbcreatecontrol(NULL, newlen,
1035 SCM_RIGHTS, SOL_SOCKET);
1036 if (*controlp == NULL) {
1037 FILEDESC_UNLOCK(td->td_proc->p_fd);
1038 error = E2BIG;
1039 unp_freerights(rp, newfds);
1040 goto next;
1041 }
1042
1043 fdp = (int *)
1044 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1045 for (i = 0; i < newfds; i++) {
1046 if (fdalloc(td, 0, &f))
1047 panic("unp_externalize fdalloc failed");
1048 fp = *rp++;
1049 td->td_proc->p_fd->fd_ofiles[f] = fp;
1050 FILE_LOCK(fp);
1051 fp->f_msgcount--;
1052 FILE_UNLOCK(fp);
1053 unp_rights--;
1054 *fdp++ = f;
1055 }
1056 FILEDESC_UNLOCK(td->td_proc->p_fd);
1057 } else { /* We can just copy anything else across */
1058 if (error || controlp == NULL)
1059 goto next;
1060 *controlp = sbcreatecontrol(NULL, datalen,
1061 cm->cmsg_type, cm->cmsg_level);
1062 if (*controlp == NULL) {
1063 error = ENOBUFS;
1064 goto next;
1065 }
1066 bcopy(data,
1067 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1068 datalen);
1069 }
1070
1071 controlp = &(*controlp)->m_next;
1072
1073 next:
1074 if (CMSG_SPACE(datalen) < clen) {
1075 clen -= CMSG_SPACE(datalen);
1076 cm = (struct cmsghdr *)
1077 ((caddr_t)cm + CMSG_SPACE(datalen));
1078 } else {
1079 clen = 0;
1080 cm = NULL;
1081 }
1082 }
1083
1084 m_freem(control);
1085
1086 return (error);
1087 }
1088
1089 void
1090 unp_init(void)
1091 {
1092 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1093 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
1094 uma_zone_set_max(unp_zone, nmbclusters);
1095 if (unp_zone == 0)
1096 panic("unp_init");
1097 LIST_INIT(&unp_dhead);
1098 LIST_INIT(&unp_shead);
1099 }
1100
1101 static int
1102 unp_internalize(controlp, td)
1103 struct mbuf **controlp;
1104 struct thread *td;
1105 {
1106 struct mbuf *control = *controlp;
1107 struct proc *p = td->td_proc;
1108 struct filedesc *fdescp = p->p_fd;
1109 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1110 struct cmsgcred *cmcred;
1111 struct file **rp;
1112 struct file *fp;
1113 struct timeval *tv;
1114 int i, fd, *fdp;
1115 void *data;
1116 socklen_t clen = control->m_len, datalen;
1117 int error, oldfds;
1118 u_int newlen;
1119
1120 error = 0;
1121 *controlp = NULL;
1122
1123 while (cm != NULL) {
1124 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1125 || cm->cmsg_len > clen) {
1126 error = EINVAL;
1127 goto out;
1128 }
1129
1130 data = CMSG_DATA(cm);
1131 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1132
1133 switch (cm->cmsg_type) {
1134 /*
1135 * Fill in credential information.
1136 */
1137 case SCM_CREDS:
1138 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1139 SCM_CREDS, SOL_SOCKET);
1140 if (*controlp == NULL) {
1141 error = ENOBUFS;
1142 goto out;
1143 }
1144
1145 cmcred = (struct cmsgcred *)
1146 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1147 cmcred->cmcred_pid = p->p_pid;
1148 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1149 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1150 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1151 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1152 CMGROUP_MAX);
1153 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1154 cmcred->cmcred_groups[i] =
1155 td->td_ucred->cr_groups[i];
1156 break;
1157
1158 case SCM_RIGHTS:
1159 oldfds = datalen / sizeof (int);
1160 /*
1161 * check that all the FDs passed in refer to legal files
1162 * If not, reject the entire operation.
1163 */
1164 fdp = data;
1165 FILEDESC_LOCK(fdescp);
1166 for (i = 0; i < oldfds; i++) {
1167 fd = *fdp++;
1168 if ((unsigned)fd >= fdescp->fd_nfiles ||
1169 fdescp->fd_ofiles[fd] == NULL) {
1170 FILEDESC_UNLOCK(fdescp);
1171 error = EBADF;
1172 goto out;
1173 }
1174 fp = fdescp->fd_ofiles[fd];
1175 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1176 FILEDESC_UNLOCK(fdescp);
1177 error = EOPNOTSUPP;
1178 goto out;
1179 }
1180
1181 }
1182 /*
1183 * Now replace the integer FDs with pointers to
1184 * the associated global file table entry..
1185 */
1186 newlen = oldfds * sizeof(struct file *);
1187 *controlp = sbcreatecontrol(NULL, newlen,
1188 SCM_RIGHTS, SOL_SOCKET);
1189 if (*controlp == NULL) {
1190 FILEDESC_UNLOCK(fdescp);
1191 error = E2BIG;
1192 goto out;
1193 }
1194
1195 fdp = data;
1196 rp = (struct file **)
1197 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1198 for (i = 0; i < oldfds; i++) {
1199 fp = fdescp->fd_ofiles[*fdp++];
1200 *rp++ = fp;
1201 FILE_LOCK(fp);
1202 fp->f_count++;
1203 fp->f_msgcount++;
1204 FILE_UNLOCK(fp);
1205 unp_rights++;
1206 }
1207 FILEDESC_UNLOCK(fdescp);
1208 break;
1209
1210 case SCM_TIMESTAMP:
1211 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1212 SCM_TIMESTAMP, SOL_SOCKET);
1213 if (*controlp == NULL) {
1214 error = ENOBUFS;
1215 goto out;
1216 }
1217 tv = (struct timeval *)
1218 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1219 microtime(tv);
1220 break;
1221
1222 default:
1223 error = EINVAL;
1224 goto out;
1225 }
1226
1227 controlp = &(*controlp)->m_next;
1228
1229 if (CMSG_SPACE(datalen) < clen) {
1230 clen -= CMSG_SPACE(datalen);
1231 cm = (struct cmsghdr *)
1232 ((caddr_t)cm + CMSG_SPACE(datalen));
1233 } else {
1234 clen = 0;
1235 cm = NULL;
1236 }
1237 }
1238
1239 out:
1240 m_freem(control);
1241
1242 return (error);
1243 }
1244
1245 static int unp_defer, unp_gcing;
1246
1247 static void
1248 unp_gc()
1249 {
1250 register struct file *fp, *nextfp;
1251 register struct socket *so;
1252 struct file **extra_ref, **fpp;
1253 int nunref, i;
1254
1255 if (unp_gcing)
1256 return;
1257 unp_gcing = 1;
1258 unp_defer = 0;
1259 /*
1260 * before going through all this, set all FDs to
1261 * be NOT defered and NOT externally accessible
1262 */
1263 sx_slock(&filelist_lock);
1264 LIST_FOREACH(fp, &filehead, f_list)
1265 fp->f_gcflag &= ~(FMARK|FDEFER);
1266 do {
1267 LIST_FOREACH(fp, &filehead, f_list) {
1268 FILE_LOCK(fp);
1269 /*
1270 * If the file is not open, skip it
1271 */
1272 if (fp->f_count == 0) {
1273 FILE_UNLOCK(fp);
1274 continue;
1275 }
1276 /*
1277 * If we already marked it as 'defer' in a
1278 * previous pass, then try process it this time
1279 * and un-mark it
1280 */
1281 if (fp->f_gcflag & FDEFER) {
1282 fp->f_gcflag &= ~FDEFER;
1283 unp_defer--;
1284 } else {
1285 /*
1286 * if it's not defered, then check if it's
1287 * already marked.. if so skip it
1288 */
1289 if (fp->f_gcflag & FMARK) {
1290 FILE_UNLOCK(fp);
1291 continue;
1292 }
1293 /*
1294 * If all references are from messages
1295 * in transit, then skip it. it's not
1296 * externally accessible.
1297 */
1298 if (fp->f_count == fp->f_msgcount) {
1299 FILE_UNLOCK(fp);
1300 continue;
1301 }
1302 /*
1303 * If it got this far then it must be
1304 * externally accessible.
1305 */
1306 fp->f_gcflag |= FMARK;
1307 }
1308 /*
1309 * either it was defered, or it is externally
1310 * accessible and not already marked so.
1311 * Now check if it is possibly one of OUR sockets.
1312 */
1313 if (fp->f_type != DTYPE_SOCKET ||
1314 (so = fp->f_data) == NULL) {
1315 FILE_UNLOCK(fp);
1316 continue;
1317 }
1318 FILE_UNLOCK(fp);
1319 if (so->so_proto->pr_domain != &localdomain ||
1320 (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1321 continue;
1322 #ifdef notdef
1323 if (so->so_rcv.sb_flags & SB_LOCK) {
1324 /*
1325 * This is problematical; it's not clear
1326 * we need to wait for the sockbuf to be
1327 * unlocked (on a uniprocessor, at least),
1328 * and it's also not clear what to do
1329 * if sbwait returns an error due to receipt
1330 * of a signal. If sbwait does return
1331 * an error, we'll go into an infinite
1332 * loop. Delete all of this for now.
1333 */
1334 (void) sbwait(&so->so_rcv);
1335 goto restart;
1336 }
1337 #endif
1338 /*
1339 * So, Ok, it's one of our sockets and it IS externally
1340 * accessible (or was defered). Now we look
1341 * to see if we hold any file descriptors in its
1342 * message buffers. Follow those links and mark them
1343 * as accessible too.
1344 */
1345 unp_scan(so->so_rcv.sb_mb, unp_mark);
1346 }
1347 } while (unp_defer);
1348 sx_sunlock(&filelist_lock);
1349 /*
1350 * We grab an extra reference to each of the file table entries
1351 * that are not otherwise accessible and then free the rights
1352 * that are stored in messages on them.
1353 *
1354 * The bug in the orginal code is a little tricky, so I'll describe
1355 * what's wrong with it here.
1356 *
1357 * It is incorrect to simply unp_discard each entry for f_msgcount
1358 * times -- consider the case of sockets A and B that contain
1359 * references to each other. On a last close of some other socket,
1360 * we trigger a gc since the number of outstanding rights (unp_rights)
1361 * is non-zero. If during the sweep phase the gc code un_discards,
1362 * we end up doing a (full) closef on the descriptor. A closef on A
1363 * results in the following chain. Closef calls soo_close, which
1364 * calls soclose. Soclose calls first (through the switch
1365 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1366 * returns because the previous instance had set unp_gcing, and
1367 * we return all the way back to soclose, which marks the socket
1368 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1369 * to free up the rights that are queued in messages on the socket A,
1370 * i.e., the reference on B. The sorflush calls via the dom_dispose
1371 * switch unp_dispose, which unp_scans with unp_discard. This second
1372 * instance of unp_discard just calls closef on B.
1373 *
1374 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1375 * which results in another closef on A. Unfortunately, A is already
1376 * being closed, and the descriptor has already been marked with
1377 * SS_NOFDREF, and soclose panics at this point.
1378 *
1379 * Here, we first take an extra reference to each inaccessible
1380 * descriptor. Then, we call sorflush ourself, since we know
1381 * it is a Unix domain socket anyhow. After we destroy all the
1382 * rights carried in messages, we do a last closef to get rid
1383 * of our extra reference. This is the last close, and the
1384 * unp_detach etc will shut down the socket.
1385 *
1386 * 91/09/19, bsy@cs.cmu.edu
1387 */
1388 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK);
1389 sx_slock(&filelist_lock);
1390 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1391 fp = nextfp) {
1392 nextfp = LIST_NEXT(fp, f_list);
1393 FILE_LOCK(fp);
1394 /*
1395 * If it's not open, skip it
1396 */
1397 if (fp->f_count == 0) {
1398 FILE_UNLOCK(fp);
1399 continue;
1400 }
1401 /*
1402 * If all refs are from msgs, and it's not marked accessible
1403 * then it must be referenced from some unreachable cycle
1404 * of (shut-down) FDs, so include it in our
1405 * list of FDs to remove
1406 */
1407 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) {
1408 *fpp++ = fp;
1409 nunref++;
1410 fp->f_count++;
1411 }
1412 FILE_UNLOCK(fp);
1413 }
1414 sx_sunlock(&filelist_lock);
1415 /*
1416 * for each FD on our hit list, do the following two things
1417 */
1418 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
1419 struct file *tfp = *fpp;
1420 FILE_LOCK(tfp);
1421 if (tfp->f_type == DTYPE_SOCKET &&
1422 tfp->f_data != NULL) {
1423 FILE_UNLOCK(tfp);
1424 sorflush(tfp->f_data);
1425 } else
1426 FILE_UNLOCK(tfp);
1427 }
1428 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
1429 closef(*fpp, (struct thread *) NULL);
1430 free(extra_ref, M_TEMP);
1431 unp_gcing = 0;
1432 }
1433
1434 void
1435 unp_dispose(m)
1436 struct mbuf *m;
1437 {
1438
1439 if (m)
1440 unp_scan(m, unp_discard);
1441 }
1442
1443 static int
1444 unp_listen(unp, td)
1445 struct unpcb *unp;
1446 struct thread *td;
1447 {
1448
1449 cru2x(td->td_ucred, &unp->unp_peercred);
1450 unp->unp_flags |= UNP_HAVEPCCACHED;
1451 return (0);
1452 }
1453
1454 static void
1455 unp_scan(m0, op)
1456 register struct mbuf *m0;
1457 void (*op)(struct file *);
1458 {
1459 struct mbuf *m;
1460 struct file **rp;
1461 struct cmsghdr *cm;
1462 void *data;
1463 int i;
1464 socklen_t clen, datalen;
1465 int qfds;
1466
1467 while (m0) {
1468 for (m = m0; m; m = m->m_next) {
1469 if (m->m_type != MT_CONTROL)
1470 continue;
1471
1472 cm = mtod(m, struct cmsghdr *);
1473 clen = m->m_len;
1474
1475 while (cm != NULL) {
1476 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
1477 break;
1478
1479 data = CMSG_DATA(cm);
1480 datalen = (caddr_t)cm + cm->cmsg_len
1481 - (caddr_t)data;
1482
1483 if (cm->cmsg_level == SOL_SOCKET &&
1484 cm->cmsg_type == SCM_RIGHTS) {
1485 qfds = datalen / sizeof (struct file *);
1486 rp = data;
1487 for (i = 0; i < qfds; i++)
1488 (*op)(*rp++);
1489 }
1490
1491 if (CMSG_SPACE(datalen) < clen) {
1492 clen -= CMSG_SPACE(datalen);
1493 cm = (struct cmsghdr *)
1494 ((caddr_t)cm + CMSG_SPACE(datalen));
1495 } else {
1496 clen = 0;
1497 cm = NULL;
1498 }
1499 }
1500 }
1501 m0 = m0->m_act;
1502 }
1503 }
1504
1505 static void
1506 unp_mark(fp)
1507 struct file *fp;
1508 {
1509 if (fp->f_gcflag & FMARK)
1510 return;
1511 unp_defer++;
1512 fp->f_gcflag |= (FMARK|FDEFER);
1513 }
1514
1515 static void
1516 unp_discard(fp)
1517 struct file *fp;
1518 {
1519 FILE_LOCK(fp);
1520 fp->f_msgcount--;
1521 unp_rights--;
1522 FILE_UNLOCK(fp);
1523 (void) closef(fp, (struct thread *)NULL);
1524 }
Cache object: f66a4ce3bc3438d8ed2a983bc330543b
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