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 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD: releng/5.2/sys/kern/uipc_usrreq.c 122875 2003-11-18 00:39:07Z rwatson $");
38
39 #include "opt_mac.h"
40
41 #include <sys/param.h>
42 #include <sys/domain.h>
43 #include <sys/fcntl.h>
44 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */
45 #include <sys/file.h>
46 #include <sys/filedesc.h>
47 #include <sys/jail.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/mac.h>
51 #include <sys/mbuf.h>
52 #include <sys/mutex.h>
53 #include <sys/namei.h>
54 #include <sys/proc.h>
55 #include <sys/protosw.h>
56 #include <sys/resourcevar.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/signalvar.h>
60 #include <sys/stat.h>
61 #include <sys/sx.h>
62 #include <sys/sysctl.h>
63 #include <sys/systm.h>
64 #include <sys/un.h>
65 #include <sys/unpcb.h>
66 #include <sys/vnode.h>
67
68 #include <vm/uma.h>
69
70 static uma_zone_t unp_zone;
71 static unp_gen_t unp_gencnt;
72 static u_int unp_count;
73
74 static struct unp_head unp_shead, unp_dhead;
75
76 /*
77 * Unix communications domain.
78 *
79 * TODO:
80 * SEQPACKET, RDM
81 * rethink name space problems
82 * need a proper out-of-band
83 * lock pushdown
84 */
85 static struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
86 static ino_t unp_ino; /* prototype for fake inode numbers */
87
88 static int unp_attach(struct socket *);
89 static void unp_detach(struct unpcb *);
90 static int unp_bind(struct unpcb *,struct sockaddr *, struct thread *);
91 static int unp_connect(struct socket *,struct sockaddr *, struct thread *);
92 static void unp_disconnect(struct unpcb *);
93 static void unp_shutdown(struct unpcb *);
94 static void unp_drop(struct unpcb *, int);
95 static void unp_gc(void);
96 static void unp_scan(struct mbuf *, void (*)(struct file *));
97 static void unp_mark(struct file *);
98 static void unp_discard(struct file *);
99 static void unp_freerights(struct file **, int);
100 static int unp_internalize(struct mbuf **, struct thread *);
101 static int unp_listen(struct unpcb *, struct thread *);
102
103 static int
104 uipc_abort(struct socket *so)
105 {
106 struct unpcb *unp = sotounpcb(so);
107
108 if (unp == 0)
109 return EINVAL;
110 unp_drop(unp, ECONNABORTED);
111 unp_detach(unp);
112 sotryfree(so);
113 return 0;
114 }
115
116 static int
117 uipc_accept(struct socket *so, struct sockaddr **nam)
118 {
119 struct unpcb *unp = sotounpcb(so);
120
121 if (unp == 0)
122 return EINVAL;
123
124 /*
125 * Pass back name of connected socket,
126 * if it was bound and we are still connected
127 * (our peer may have closed already!).
128 */
129 if (unp->unp_conn && unp->unp_conn->unp_addr) {
130 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
131 1);
132 } else {
133 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
134 }
135 return 0;
136 }
137
138 static int
139 uipc_attach(struct socket *so, int proto, struct thread *td)
140 {
141 struct unpcb *unp = sotounpcb(so);
142
143 if (unp != 0)
144 return EISCONN;
145 return unp_attach(so);
146 }
147
148 static int
149 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
150 {
151 struct unpcb *unp = sotounpcb(so);
152
153 if (unp == 0)
154 return EINVAL;
155
156 return unp_bind(unp, nam, td);
157 }
158
159 static int
160 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
161 {
162 struct unpcb *unp = sotounpcb(so);
163
164 if (unp == 0)
165 return EINVAL;
166 return unp_connect(so, nam, curthread);
167 }
168
169 static int
170 uipc_connect2(struct socket *so1, struct socket *so2)
171 {
172 struct unpcb *unp = sotounpcb(so1);
173
174 if (unp == 0)
175 return EINVAL;
176
177 return unp_connect2(so1, so2);
178 }
179
180 /* control is EOPNOTSUPP */
181
182 static int
183 uipc_detach(struct socket *so)
184 {
185 struct unpcb *unp = sotounpcb(so);
186
187 if (unp == 0)
188 return EINVAL;
189
190 unp_detach(unp);
191 return 0;
192 }
193
194 static int
195 uipc_disconnect(struct socket *so)
196 {
197 struct unpcb *unp = sotounpcb(so);
198
199 if (unp == 0)
200 return EINVAL;
201 unp_disconnect(unp);
202 return 0;
203 }
204
205 static int
206 uipc_listen(struct socket *so, struct thread *td)
207 {
208 struct unpcb *unp = sotounpcb(so);
209
210 if (unp == 0 || unp->unp_vnode == 0)
211 return EINVAL;
212 return unp_listen(unp, td);
213 }
214
215 static int
216 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
217 {
218 struct unpcb *unp = sotounpcb(so);
219
220 if (unp == 0)
221 return EINVAL;
222 if (unp->unp_conn && unp->unp_conn->unp_addr)
223 *nam = dup_sockaddr((struct sockaddr *)unp->unp_conn->unp_addr,
224 1);
225 else {
226 /*
227 * XXX: It seems that this test always fails even when
228 * connection is established. So, this else clause is
229 * added as workaround to return PF_LOCAL sockaddr.
230 */
231 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
232 }
233 return 0;
234 }
235
236 static int
237 uipc_rcvd(struct socket *so, int flags)
238 {
239 struct unpcb *unp = sotounpcb(so);
240 struct socket *so2;
241 u_long newhiwat;
242
243 if (unp == 0)
244 return EINVAL;
245 switch (so->so_type) {
246 case SOCK_DGRAM:
247 panic("uipc_rcvd DGRAM?");
248 /*NOTREACHED*/
249
250 case SOCK_STREAM:
251 if (unp->unp_conn == 0)
252 break;
253 so2 = unp->unp_conn->unp_socket;
254 /*
255 * Adjust backpressure on sender
256 * and wakeup any waiting to write.
257 */
258 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
259 unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
260 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
261 so->so_rcv.sb_cc;
262 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
263 newhiwat, RLIM_INFINITY);
264 unp->unp_cc = so->so_rcv.sb_cc;
265 sowwakeup(so2);
266 break;
267
268 default:
269 panic("uipc_rcvd unknown socktype");
270 }
271 return 0;
272 }
273
274 /* pru_rcvoob is EOPNOTSUPP */
275
276 static int
277 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
278 struct mbuf *control, struct thread *td)
279 {
280 int error = 0;
281 struct unpcb *unp = sotounpcb(so);
282 struct socket *so2;
283 u_long newhiwat;
284
285 if (unp == 0) {
286 error = EINVAL;
287 goto release;
288 }
289 if (flags & PRUS_OOB) {
290 error = EOPNOTSUPP;
291 goto release;
292 }
293
294 if (control && (error = unp_internalize(&control, td)))
295 goto release;
296
297 switch (so->so_type) {
298 case SOCK_DGRAM:
299 {
300 struct sockaddr *from;
301
302 if (nam) {
303 if (unp->unp_conn) {
304 error = EISCONN;
305 break;
306 }
307 error = unp_connect(so, nam, td);
308 if (error)
309 break;
310 } else {
311 if (unp->unp_conn == 0) {
312 error = ENOTCONN;
313 break;
314 }
315 }
316 so2 = unp->unp_conn->unp_socket;
317 if (unp->unp_addr)
318 from = (struct sockaddr *)unp->unp_addr;
319 else
320 from = &sun_noname;
321 if (sbappendaddr(&so2->so_rcv, from, m, control)) {
322 sorwakeup(so2);
323 m = 0;
324 control = 0;
325 } else
326 error = ENOBUFS;
327 if (nam)
328 unp_disconnect(unp);
329 break;
330 }
331
332 case SOCK_STREAM:
333 /* Connect if not connected yet. */
334 /*
335 * Note: A better implementation would complain
336 * if not equal to the peer's address.
337 */
338 if ((so->so_state & SS_ISCONNECTED) == 0) {
339 if (nam) {
340 error = unp_connect(so, nam, td);
341 if (error)
342 break; /* XXX */
343 } else {
344 error = ENOTCONN;
345 break;
346 }
347 }
348
349 if (so->so_state & SS_CANTSENDMORE) {
350 error = EPIPE;
351 break;
352 }
353 if (unp->unp_conn == 0)
354 panic("uipc_send connected but no connection?");
355 so2 = unp->unp_conn->unp_socket;
356 /*
357 * Send to paired receive port, and then reduce
358 * send buffer hiwater marks to maintain backpressure.
359 * Wake up readers.
360 */
361 if (control) {
362 if (sbappendcontrol(&so2->so_rcv, m, control))
363 control = 0;
364 } else
365 sbappend(&so2->so_rcv, m);
366 so->so_snd.sb_mbmax -=
367 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
368 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
369 newhiwat = so->so_snd.sb_hiwat -
370 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
371 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
372 newhiwat, RLIM_INFINITY);
373 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
374 sorwakeup(so2);
375 m = 0;
376 break;
377
378 default:
379 panic("uipc_send unknown socktype");
380 }
381
382 /*
383 * SEND_EOF is equivalent to a SEND followed by
384 * a SHUTDOWN.
385 */
386 if (flags & PRUS_EOF) {
387 socantsendmore(so);
388 unp_shutdown(unp);
389 }
390
391 if (control && error != 0)
392 unp_dispose(control);
393
394 release:
395 if (control)
396 m_freem(control);
397 if (m)
398 m_freem(m);
399 return error;
400 }
401
402 static int
403 uipc_sense(struct socket *so, struct stat *sb)
404 {
405 struct unpcb *unp = sotounpcb(so);
406 struct socket *so2;
407
408 if (unp == 0)
409 return EINVAL;
410 sb->st_blksize = so->so_snd.sb_hiwat;
411 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
412 so2 = unp->unp_conn->unp_socket;
413 sb->st_blksize += so2->so_rcv.sb_cc;
414 }
415 sb->st_dev = NOUDEV;
416 if (unp->unp_ino == 0)
417 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
418 sb->st_ino = unp->unp_ino;
419 return (0);
420 }
421
422 static int
423 uipc_shutdown(struct socket *so)
424 {
425 struct unpcb *unp = sotounpcb(so);
426
427 if (unp == 0)
428 return EINVAL;
429 socantsendmore(so);
430 unp_shutdown(unp);
431 return 0;
432 }
433
434 static int
435 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
436 {
437 struct unpcb *unp = sotounpcb(so);
438
439 if (unp == 0)
440 return EINVAL;
441 if (unp->unp_addr)
442 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
443 else
444 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
445 return 0;
446 }
447
448 struct pr_usrreqs uipc_usrreqs = {
449 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
450 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
451 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
452 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
453 sosend, soreceive, sopoll, pru_sosetlabel_null
454 };
455
456 int
457 uipc_ctloutput(so, sopt)
458 struct socket *so;
459 struct sockopt *sopt;
460 {
461 struct unpcb *unp = sotounpcb(so);
462 int error;
463
464 switch (sopt->sopt_dir) {
465 case SOPT_GET:
466 switch (sopt->sopt_name) {
467 case LOCAL_PEERCRED:
468 if (unp->unp_flags & UNP_HAVEPC)
469 error = sooptcopyout(sopt, &unp->unp_peercred,
470 sizeof(unp->unp_peercred));
471 else {
472 if (so->so_type == SOCK_STREAM)
473 error = ENOTCONN;
474 else
475 error = EINVAL;
476 }
477 break;
478 default:
479 error = EOPNOTSUPP;
480 break;
481 }
482 break;
483 case SOPT_SET:
484 default:
485 error = EOPNOTSUPP;
486 break;
487 }
488 return (error);
489 }
490
491 /*
492 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
493 * for stream sockets, although the total for sender and receiver is
494 * actually only PIPSIZ.
495 * Datagram sockets really use the sendspace as the maximum datagram size,
496 * and don't really want to reserve the sendspace. Their recvspace should
497 * be large enough for at least one max-size datagram plus address.
498 */
499 #ifndef PIPSIZ
500 #define PIPSIZ 8192
501 #endif
502 static u_long unpst_sendspace = PIPSIZ;
503 static u_long unpst_recvspace = PIPSIZ;
504 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
505 static u_long unpdg_recvspace = 4*1024;
506
507 static int unp_rights; /* file descriptors in flight */
508
509 SYSCTL_DECL(_net_local_stream);
510 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
511 &unpst_sendspace, 0, "");
512 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
513 &unpst_recvspace, 0, "");
514 SYSCTL_DECL(_net_local_dgram);
515 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
516 &unpdg_sendspace, 0, "");
517 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
518 &unpdg_recvspace, 0, "");
519 SYSCTL_DECL(_net_local);
520 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
521
522 static int
523 unp_attach(so)
524 struct socket *so;
525 {
526 register struct unpcb *unp;
527 int error;
528
529 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
530 switch (so->so_type) {
531
532 case SOCK_STREAM:
533 error = soreserve(so, unpst_sendspace, unpst_recvspace);
534 break;
535
536 case SOCK_DGRAM:
537 error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
538 break;
539
540 default:
541 panic("unp_attach");
542 }
543 if (error)
544 return (error);
545 }
546 unp = uma_zalloc(unp_zone, M_WAITOK);
547 if (unp == NULL)
548 return (ENOBUFS);
549 bzero(unp, sizeof *unp);
550 unp->unp_gencnt = ++unp_gencnt;
551 unp_count++;
552 LIST_INIT(&unp->unp_refs);
553 unp->unp_socket = so;
554 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
555 : &unp_shead, unp, unp_link);
556 so->so_pcb = unp;
557 return (0);
558 }
559
560 static void
561 unp_detach(unp)
562 register struct unpcb *unp;
563 {
564 LIST_REMOVE(unp, unp_link);
565 unp->unp_gencnt = ++unp_gencnt;
566 --unp_count;
567 if (unp->unp_vnode) {
568 unp->unp_vnode->v_socket = 0;
569 vrele(unp->unp_vnode);
570 unp->unp_vnode = 0;
571 }
572 if (unp->unp_conn)
573 unp_disconnect(unp);
574 while (!LIST_EMPTY(&unp->unp_refs))
575 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
576 soisdisconnected(unp->unp_socket);
577 unp->unp_socket->so_pcb = 0;
578 if (unp_rights) {
579 /*
580 * Normally the receive buffer is flushed later,
581 * in sofree, but if our receive buffer holds references
582 * to descriptors that are now garbage, we will dispose
583 * of those descriptor references after the garbage collector
584 * gets them (resulting in a "panic: closef: count < 0").
585 */
586 sorflush(unp->unp_socket);
587 unp_gc();
588 }
589 if (unp->unp_addr)
590 FREE(unp->unp_addr, M_SONAME);
591 uma_zfree(unp_zone, unp);
592 }
593
594 static int
595 unp_bind(unp, nam, td)
596 struct unpcb *unp;
597 struct sockaddr *nam;
598 struct thread *td;
599 {
600 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
601 struct vnode *vp;
602 struct mount *mp;
603 struct vattr vattr;
604 int error, namelen;
605 struct nameidata nd;
606 char *buf;
607
608 if (unp->unp_vnode != NULL)
609 return (EINVAL);
610
611 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
612 if (namelen <= 0)
613 return EINVAL;
614
615 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
616 strlcpy(buf, soun->sun_path, namelen + 1);
617
618 restart:
619 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE,
620 buf, td);
621 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
622 error = namei(&nd);
623 if (error) {
624 free(buf, M_TEMP);
625 return (error);
626 }
627 vp = nd.ni_vp;
628 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
629 NDFREE(&nd, NDF_ONLY_PNBUF);
630 if (nd.ni_dvp == vp)
631 vrele(nd.ni_dvp);
632 else
633 vput(nd.ni_dvp);
634 if (vp != NULL) {
635 vrele(vp);
636 free(buf, M_TEMP);
637 return (EADDRINUSE);
638 }
639 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
640 if (error) {
641 free(buf, M_TEMP);
642 return (error);
643 }
644 goto restart;
645 }
646 VATTR_NULL(&vattr);
647 vattr.va_type = VSOCK;
648 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
649 #ifdef MAC
650 error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
651 &vattr);
652 #endif
653 if (error == 0) {
654 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
655 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
656 }
657 NDFREE(&nd, NDF_ONLY_PNBUF);
658 vput(nd.ni_dvp);
659 if (error) {
660 free(buf, M_TEMP);
661 return (error);
662 }
663 vp = nd.ni_vp;
664 vp->v_socket = unp->unp_socket;
665 unp->unp_vnode = vp;
666 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
667 VOP_UNLOCK(vp, 0, td);
668 vn_finished_write(mp);
669 free(buf, M_TEMP);
670 return (0);
671 }
672
673 static int
674 unp_connect(so, nam, td)
675 struct socket *so;
676 struct sockaddr *nam;
677 struct thread *td;
678 {
679 register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
680 register struct vnode *vp;
681 register struct socket *so2, *so3;
682 struct unpcb *unp, *unp2, *unp3;
683 int error, len;
684 struct nameidata nd;
685 char buf[SOCK_MAXADDRLEN];
686
687 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
688 if (len <= 0)
689 return EINVAL;
690 strlcpy(buf, soun->sun_path, len + 1);
691
692 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
693 error = namei(&nd);
694 if (error)
695 return (error);
696 vp = nd.ni_vp;
697 NDFREE(&nd, NDF_ONLY_PNBUF);
698 if (vp->v_type != VSOCK) {
699 error = ENOTSOCK;
700 goto bad;
701 }
702 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
703 if (error)
704 goto bad;
705 so2 = vp->v_socket;
706 if (so2 == 0) {
707 error = ECONNREFUSED;
708 goto bad;
709 }
710 if (so->so_type != so2->so_type) {
711 error = EPROTOTYPE;
712 goto bad;
713 }
714 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
715 if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
716 (so3 = sonewconn(so2, 0)) == 0) {
717 error = ECONNREFUSED;
718 goto bad;
719 }
720 unp = sotounpcb(so);
721 unp2 = sotounpcb(so2);
722 unp3 = sotounpcb(so3);
723 if (unp2->unp_addr)
724 unp3->unp_addr = (struct sockaddr_un *)
725 dup_sockaddr((struct sockaddr *)
726 unp2->unp_addr, 1);
727
728 /*
729 * unp_peercred management:
730 *
731 * The connecter's (client's) credentials are copied
732 * from its process structure at the time of connect()
733 * (which is now).
734 */
735 cru2x(td->td_ucred, &unp3->unp_peercred);
736 unp3->unp_flags |= UNP_HAVEPC;
737 /*
738 * The receiver's (server's) credentials are copied
739 * from the unp_peercred member of socket on which the
740 * former called listen(); unp_listen() cached that
741 * process's credentials at that time so we can use
742 * them now.
743 */
744 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
745 ("unp_connect: listener without cached peercred"));
746 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
747 sizeof(unp->unp_peercred));
748 unp->unp_flags |= UNP_HAVEPC;
749 #ifdef MAC
750 mac_set_socket_peer_from_socket(so, so3);
751 mac_set_socket_peer_from_socket(so3, so);
752 #endif
753
754 so2 = so3;
755 }
756 error = unp_connect2(so, so2);
757 bad:
758 vput(vp);
759 return (error);
760 }
761
762 int
763 unp_connect2(so, so2)
764 register struct socket *so;
765 register struct socket *so2;
766 {
767 register struct unpcb *unp = sotounpcb(so);
768 register struct unpcb *unp2;
769
770 if (so2->so_type != so->so_type)
771 return (EPROTOTYPE);
772 unp2 = sotounpcb(so2);
773 unp->unp_conn = unp2;
774 switch (so->so_type) {
775
776 case SOCK_DGRAM:
777 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
778 soisconnected(so);
779 break;
780
781 case SOCK_STREAM:
782 unp2->unp_conn = unp;
783 soisconnected(so);
784 soisconnected(so2);
785 break;
786
787 default:
788 panic("unp_connect2");
789 }
790 return (0);
791 }
792
793 static void
794 unp_disconnect(unp)
795 struct unpcb *unp;
796 {
797 register struct unpcb *unp2 = unp->unp_conn;
798
799 if (unp2 == 0)
800 return;
801 unp->unp_conn = 0;
802 switch (unp->unp_socket->so_type) {
803
804 case SOCK_DGRAM:
805 LIST_REMOVE(unp, unp_reflink);
806 unp->unp_socket->so_state &= ~SS_ISCONNECTED;
807 break;
808
809 case SOCK_STREAM:
810 soisdisconnected(unp->unp_socket);
811 unp2->unp_conn = 0;
812 soisdisconnected(unp2->unp_socket);
813 break;
814 }
815 }
816
817 #ifdef notdef
818 void
819 unp_abort(unp)
820 struct unpcb *unp;
821 {
822
823 unp_detach(unp);
824 }
825 #endif
826
827 static int
828 unp_pcblist(SYSCTL_HANDLER_ARGS)
829 {
830 int error, i, n;
831 struct unpcb *unp, **unp_list;
832 unp_gen_t gencnt;
833 struct xunpgen *xug;
834 struct unp_head *head;
835 struct xunpcb *xu;
836
837 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
838
839 /*
840 * The process of preparing the PCB list is too time-consuming and
841 * resource-intensive to repeat twice on every request.
842 */
843 if (req->oldptr == 0) {
844 n = unp_count;
845 req->oldidx = 2 * (sizeof *xug)
846 + (n + n/8) * sizeof(struct xunpcb);
847 return 0;
848 }
849
850 if (req->newptr != 0)
851 return EPERM;
852
853 /*
854 * OK, now we're committed to doing something.
855 */
856 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
857 gencnt = unp_gencnt;
858 n = unp_count;
859
860 xug->xug_len = sizeof *xug;
861 xug->xug_count = n;
862 xug->xug_gen = gencnt;
863 xug->xug_sogen = so_gencnt;
864 error = SYSCTL_OUT(req, xug, sizeof *xug);
865 if (error) {
866 free(xug, M_TEMP);
867 return error;
868 }
869
870 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
871
872 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
873 unp = LIST_NEXT(unp, unp_link)) {
874 if (unp->unp_gencnt <= gencnt) {
875 if (cr_cansee(req->td->td_ucred,
876 unp->unp_socket->so_cred))
877 continue;
878 unp_list[i++] = unp;
879 }
880 }
881 n = i; /* in case we lost some during malloc */
882
883 error = 0;
884 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
885 for (i = 0; i < n; i++) {
886 unp = unp_list[i];
887 if (unp->unp_gencnt <= gencnt) {
888 xu->xu_len = sizeof *xu;
889 xu->xu_unpp = unp;
890 /*
891 * XXX - need more locking here to protect against
892 * connect/disconnect races for SMP.
893 */
894 if (unp->unp_addr)
895 bcopy(unp->unp_addr, &xu->xu_addr,
896 unp->unp_addr->sun_len);
897 if (unp->unp_conn && unp->unp_conn->unp_addr)
898 bcopy(unp->unp_conn->unp_addr,
899 &xu->xu_caddr,
900 unp->unp_conn->unp_addr->sun_len);
901 bcopy(unp, &xu->xu_unp, sizeof *unp);
902 sotoxsocket(unp->unp_socket, &xu->xu_socket);
903 error = SYSCTL_OUT(req, xu, sizeof *xu);
904 }
905 }
906 free(xu, M_TEMP);
907 if (!error) {
908 /*
909 * Give the user an updated idea of our state.
910 * If the generation differs from what we told
911 * her before, she knows that something happened
912 * while we were processing this request, and it
913 * might be necessary to retry.
914 */
915 xug->xug_gen = unp_gencnt;
916 xug->xug_sogen = so_gencnt;
917 xug->xug_count = unp_count;
918 error = SYSCTL_OUT(req, xug, sizeof *xug);
919 }
920 free(unp_list, M_TEMP);
921 free(xug, M_TEMP);
922 return error;
923 }
924
925 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
926 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
927 "List of active local datagram sockets");
928 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
929 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
930 "List of active local stream sockets");
931
932 static void
933 unp_shutdown(unp)
934 struct unpcb *unp;
935 {
936 struct socket *so;
937
938 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
939 (so = unp->unp_conn->unp_socket))
940 socantrcvmore(so);
941 }
942
943 static void
944 unp_drop(unp, errno)
945 struct unpcb *unp;
946 int errno;
947 {
948 struct socket *so = unp->unp_socket;
949
950 so->so_error = errno;
951 unp_disconnect(unp);
952 }
953
954 #ifdef notdef
955 void
956 unp_drain()
957 {
958
959 }
960 #endif
961
962 static void
963 unp_freerights(rp, fdcount)
964 struct file **rp;
965 int fdcount;
966 {
967 int i;
968 struct file *fp;
969
970 for (i = 0; i < fdcount; i++) {
971 fp = *rp;
972 /*
973 * zero the pointer before calling
974 * unp_discard since it may end up
975 * in unp_gc()..
976 */
977 *rp++ = 0;
978 unp_discard(fp);
979 }
980 }
981
982 int
983 unp_externalize(control, controlp)
984 struct mbuf *control, **controlp;
985 {
986 struct thread *td = curthread; /* XXX */
987 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
988 int i;
989 int *fdp;
990 struct file **rp;
991 struct file *fp;
992 void *data;
993 socklen_t clen = control->m_len, datalen;
994 int error, newfds;
995 int f;
996 u_int newlen;
997
998 error = 0;
999 if (controlp != NULL) /* controlp == NULL => free control messages */
1000 *controlp = NULL;
1001
1002 while (cm != NULL) {
1003 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1004 error = EINVAL;
1005 break;
1006 }
1007
1008 data = CMSG_DATA(cm);
1009 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1010
1011 if (cm->cmsg_level == SOL_SOCKET
1012 && cm->cmsg_type == SCM_RIGHTS) {
1013 newfds = datalen / sizeof(struct file *);
1014 rp = data;
1015
1016 /* If we're not outputting the descriptors free them. */
1017 if (error || controlp == NULL) {
1018 unp_freerights(rp, newfds);
1019 goto next;
1020 }
1021 FILEDESC_LOCK(td->td_proc->p_fd);
1022 /* if the new FD's will not fit free them. */
1023 if (!fdavail(td, newfds)) {
1024 FILEDESC_UNLOCK(td->td_proc->p_fd);
1025 error = EMSGSIZE;
1026 unp_freerights(rp, newfds);
1027 goto next;
1028 }
1029 /*
1030 * now change each pointer to an fd in the global
1031 * table to an integer that is the index to the
1032 * local fd table entry that we set up to point
1033 * to the global one we are transferring.
1034 */
1035 newlen = newfds * sizeof(int);
1036 *controlp = sbcreatecontrol(NULL, newlen,
1037 SCM_RIGHTS, SOL_SOCKET);
1038 if (*controlp == NULL) {
1039 FILEDESC_UNLOCK(td->td_proc->p_fd);
1040 error = E2BIG;
1041 unp_freerights(rp, newfds);
1042 goto next;
1043 }
1044
1045 fdp = (int *)
1046 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1047 for (i = 0; i < newfds; i++) {
1048 if (fdalloc(td, 0, &f))
1049 panic("unp_externalize fdalloc failed");
1050 fp = *rp++;
1051 td->td_proc->p_fd->fd_ofiles[f] = fp;
1052 FILE_LOCK(fp);
1053 fp->f_msgcount--;
1054 FILE_UNLOCK(fp);
1055 unp_rights--;
1056 *fdp++ = f;
1057 }
1058 FILEDESC_UNLOCK(td->td_proc->p_fd);
1059 } else { /* We can just copy anything else across */
1060 if (error || controlp == NULL)
1061 goto next;
1062 *controlp = sbcreatecontrol(NULL, datalen,
1063 cm->cmsg_type, cm->cmsg_level);
1064 if (*controlp == NULL) {
1065 error = ENOBUFS;
1066 goto next;
1067 }
1068 bcopy(data,
1069 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1070 datalen);
1071 }
1072
1073 controlp = &(*controlp)->m_next;
1074
1075 next:
1076 if (CMSG_SPACE(datalen) < clen) {
1077 clen -= CMSG_SPACE(datalen);
1078 cm = (struct cmsghdr *)
1079 ((caddr_t)cm + CMSG_SPACE(datalen));
1080 } else {
1081 clen = 0;
1082 cm = NULL;
1083 }
1084 }
1085
1086 m_freem(control);
1087
1088 return (error);
1089 }
1090
1091 void
1092 unp_init(void)
1093 {
1094 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1095 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
1096 uma_zone_set_max(unp_zone, nmbclusters);
1097 if (unp_zone == 0)
1098 panic("unp_init");
1099 LIST_INIT(&unp_dhead);
1100 LIST_INIT(&unp_shead);
1101 }
1102
1103 static int
1104 unp_internalize(controlp, td)
1105 struct mbuf **controlp;
1106 struct thread *td;
1107 {
1108 struct mbuf *control = *controlp;
1109 struct proc *p = td->td_proc;
1110 struct filedesc *fdescp = p->p_fd;
1111 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1112 struct cmsgcred *cmcred;
1113 struct file **rp;
1114 struct file *fp;
1115 struct timeval *tv;
1116 int i, fd, *fdp;
1117 void *data;
1118 socklen_t clen = control->m_len, datalen;
1119 int error, oldfds;
1120 u_int newlen;
1121
1122 error = 0;
1123 *controlp = NULL;
1124
1125 while (cm != NULL) {
1126 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1127 || cm->cmsg_len > clen) {
1128 error = EINVAL;
1129 goto out;
1130 }
1131
1132 data = CMSG_DATA(cm);
1133 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1134
1135 switch (cm->cmsg_type) {
1136 /*
1137 * Fill in credential information.
1138 */
1139 case SCM_CREDS:
1140 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1141 SCM_CREDS, SOL_SOCKET);
1142 if (*controlp == NULL) {
1143 error = ENOBUFS;
1144 goto out;
1145 }
1146
1147 cmcred = (struct cmsgcred *)
1148 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1149 cmcred->cmcred_pid = p->p_pid;
1150 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1151 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1152 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1153 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1154 CMGROUP_MAX);
1155 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1156 cmcred->cmcred_groups[i] =
1157 td->td_ucred->cr_groups[i];
1158 break;
1159
1160 case SCM_RIGHTS:
1161 oldfds = datalen / sizeof (int);
1162 /*
1163 * check that all the FDs passed in refer to legal files
1164 * If not, reject the entire operation.
1165 */
1166 fdp = data;
1167 FILEDESC_LOCK(fdescp);
1168 for (i = 0; i < oldfds; i++) {
1169 fd = *fdp++;
1170 if ((unsigned)fd >= fdescp->fd_nfiles ||
1171 fdescp->fd_ofiles[fd] == NULL) {
1172 FILEDESC_UNLOCK(fdescp);
1173 error = EBADF;
1174 goto out;
1175 }
1176 fp = fdescp->fd_ofiles[fd];
1177 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1178 FILEDESC_UNLOCK(fdescp);
1179 error = EOPNOTSUPP;
1180 goto out;
1181 }
1182
1183 }
1184 /*
1185 * Now replace the integer FDs with pointers to
1186 * the associated global file table entry..
1187 */
1188 newlen = oldfds * sizeof(struct file *);
1189 *controlp = sbcreatecontrol(NULL, newlen,
1190 SCM_RIGHTS, SOL_SOCKET);
1191 if (*controlp == NULL) {
1192 FILEDESC_UNLOCK(fdescp);
1193 error = E2BIG;
1194 goto out;
1195 }
1196
1197 fdp = data;
1198 rp = (struct file **)
1199 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1200 for (i = 0; i < oldfds; i++) {
1201 fp = fdescp->fd_ofiles[*fdp++];
1202 *rp++ = fp;
1203 FILE_LOCK(fp);
1204 fp->f_count++;
1205 fp->f_msgcount++;
1206 FILE_UNLOCK(fp);
1207 unp_rights++;
1208 }
1209 FILEDESC_UNLOCK(fdescp);
1210 break;
1211
1212 case SCM_TIMESTAMP:
1213 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1214 SCM_TIMESTAMP, SOL_SOCKET);
1215 if (*controlp == NULL) {
1216 error = ENOBUFS;
1217 goto out;
1218 }
1219 tv = (struct timeval *)
1220 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1221 microtime(tv);
1222 break;
1223
1224 default:
1225 error = EINVAL;
1226 goto out;
1227 }
1228
1229 controlp = &(*controlp)->m_next;
1230
1231 if (CMSG_SPACE(datalen) < clen) {
1232 clen -= CMSG_SPACE(datalen);
1233 cm = (struct cmsghdr *)
1234 ((caddr_t)cm + CMSG_SPACE(datalen));
1235 } else {
1236 clen = 0;
1237 cm = NULL;
1238 }
1239 }
1240
1241 out:
1242 m_freem(control);
1243
1244 return (error);
1245 }
1246
1247 static int unp_defer, unp_gcing;
1248
1249 static void
1250 unp_gc()
1251 {
1252 register struct file *fp, *nextfp;
1253 register struct socket *so;
1254 struct file **extra_ref, **fpp;
1255 int nunref, i;
1256
1257 if (unp_gcing)
1258 return;
1259 unp_gcing = 1;
1260 unp_defer = 0;
1261 /*
1262 * before going through all this, set all FDs to
1263 * be NOT defered and NOT externally accessible
1264 */
1265 sx_slock(&filelist_lock);
1266 LIST_FOREACH(fp, &filehead, f_list)
1267 fp->f_gcflag &= ~(FMARK|FDEFER);
1268 do {
1269 LIST_FOREACH(fp, &filehead, f_list) {
1270 FILE_LOCK(fp);
1271 /*
1272 * If the file is not open, skip it
1273 */
1274 if (fp->f_count == 0) {
1275 FILE_UNLOCK(fp);
1276 continue;
1277 }
1278 /*
1279 * If we already marked it as 'defer' in a
1280 * previous pass, then try process it this time
1281 * and un-mark it
1282 */
1283 if (fp->f_gcflag & FDEFER) {
1284 fp->f_gcflag &= ~FDEFER;
1285 unp_defer--;
1286 } else {
1287 /*
1288 * if it's not defered, then check if it's
1289 * already marked.. if so skip it
1290 */
1291 if (fp->f_gcflag & FMARK) {
1292 FILE_UNLOCK(fp);
1293 continue;
1294 }
1295 /*
1296 * If all references are from messages
1297 * in transit, then skip it. it's not
1298 * externally accessible.
1299 */
1300 if (fp->f_count == fp->f_msgcount) {
1301 FILE_UNLOCK(fp);
1302 continue;
1303 }
1304 /*
1305 * If it got this far then it must be
1306 * externally accessible.
1307 */
1308 fp->f_gcflag |= FMARK;
1309 }
1310 /*
1311 * either it was defered, or it is externally
1312 * accessible and not already marked so.
1313 * Now check if it is possibly one of OUR sockets.
1314 */
1315 if (fp->f_type != DTYPE_SOCKET ||
1316 (so = fp->f_data) == NULL) {
1317 FILE_UNLOCK(fp);
1318 continue;
1319 }
1320 FILE_UNLOCK(fp);
1321 if (so->so_proto->pr_domain != &localdomain ||
1322 (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1323 continue;
1324 #ifdef notdef
1325 if (so->so_rcv.sb_flags & SB_LOCK) {
1326 /*
1327 * This is problematical; it's not clear
1328 * we need to wait for the sockbuf to be
1329 * unlocked (on a uniprocessor, at least),
1330 * and it's also not clear what to do
1331 * if sbwait returns an error due to receipt
1332 * of a signal. If sbwait does return
1333 * an error, we'll go into an infinite
1334 * loop. Delete all of this for now.
1335 */
1336 (void) sbwait(&so->so_rcv);
1337 goto restart;
1338 }
1339 #endif
1340 /*
1341 * So, Ok, it's one of our sockets and it IS externally
1342 * accessible (or was defered). Now we look
1343 * to see if we hold any file descriptors in its
1344 * message buffers. Follow those links and mark them
1345 * as accessible too.
1346 */
1347 unp_scan(so->so_rcv.sb_mb, unp_mark);
1348 }
1349 } while (unp_defer);
1350 sx_sunlock(&filelist_lock);
1351 /*
1352 * We grab an extra reference to each of the file table entries
1353 * that are not otherwise accessible and then free the rights
1354 * that are stored in messages on them.
1355 *
1356 * The bug in the orginal code is a little tricky, so I'll describe
1357 * what's wrong with it here.
1358 *
1359 * It is incorrect to simply unp_discard each entry for f_msgcount
1360 * times -- consider the case of sockets A and B that contain
1361 * references to each other. On a last close of some other socket,
1362 * we trigger a gc since the number of outstanding rights (unp_rights)
1363 * is non-zero. If during the sweep phase the gc code un_discards,
1364 * we end up doing a (full) closef on the descriptor. A closef on A
1365 * results in the following chain. Closef calls soo_close, which
1366 * calls soclose. Soclose calls first (through the switch
1367 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1368 * returns because the previous instance had set unp_gcing, and
1369 * we return all the way back to soclose, which marks the socket
1370 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1371 * to free up the rights that are queued in messages on the socket A,
1372 * i.e., the reference on B. The sorflush calls via the dom_dispose
1373 * switch unp_dispose, which unp_scans with unp_discard. This second
1374 * instance of unp_discard just calls closef on B.
1375 *
1376 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1377 * which results in another closef on A. Unfortunately, A is already
1378 * being closed, and the descriptor has already been marked with
1379 * SS_NOFDREF, and soclose panics at this point.
1380 *
1381 * Here, we first take an extra reference to each inaccessible
1382 * descriptor. Then, we call sorflush ourself, since we know
1383 * it is a Unix domain socket anyhow. After we destroy all the
1384 * rights carried in messages, we do a last closef to get rid
1385 * of our extra reference. This is the last close, and the
1386 * unp_detach etc will shut down the socket.
1387 *
1388 * 91/09/19, bsy@cs.cmu.edu
1389 */
1390 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK);
1391 sx_slock(&filelist_lock);
1392 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1393 fp = nextfp) {
1394 nextfp = LIST_NEXT(fp, f_list);
1395 FILE_LOCK(fp);
1396 /*
1397 * If it's not open, skip it
1398 */
1399 if (fp->f_count == 0) {
1400 FILE_UNLOCK(fp);
1401 continue;
1402 }
1403 /*
1404 * If all refs are from msgs, and it's not marked accessible
1405 * then it must be referenced from some unreachable cycle
1406 * of (shut-down) FDs, so include it in our
1407 * list of FDs to remove
1408 */
1409 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) {
1410 *fpp++ = fp;
1411 nunref++;
1412 fp->f_count++;
1413 }
1414 FILE_UNLOCK(fp);
1415 }
1416 sx_sunlock(&filelist_lock);
1417 /*
1418 * for each FD on our hit list, do the following two things
1419 */
1420 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
1421 struct file *tfp = *fpp;
1422 FILE_LOCK(tfp);
1423 if (tfp->f_type == DTYPE_SOCKET &&
1424 tfp->f_data != NULL) {
1425 FILE_UNLOCK(tfp);
1426 sorflush(tfp->f_data);
1427 } else
1428 FILE_UNLOCK(tfp);
1429 }
1430 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
1431 closef(*fpp, (struct thread *) NULL);
1432 free(extra_ref, M_TEMP);
1433 unp_gcing = 0;
1434 }
1435
1436 void
1437 unp_dispose(m)
1438 struct mbuf *m;
1439 {
1440
1441 if (m)
1442 unp_scan(m, unp_discard);
1443 }
1444
1445 static int
1446 unp_listen(unp, td)
1447 struct unpcb *unp;
1448 struct thread *td;
1449 {
1450
1451 cru2x(td->td_ucred, &unp->unp_peercred);
1452 unp->unp_flags |= UNP_HAVEPCCACHED;
1453 return (0);
1454 }
1455
1456 static void
1457 unp_scan(m0, op)
1458 register struct mbuf *m0;
1459 void (*op)(struct file *);
1460 {
1461 struct mbuf *m;
1462 struct file **rp;
1463 struct cmsghdr *cm;
1464 void *data;
1465 int i;
1466 socklen_t clen, datalen;
1467 int qfds;
1468
1469 while (m0) {
1470 for (m = m0; m; m = m->m_next) {
1471 if (m->m_type != MT_CONTROL)
1472 continue;
1473
1474 cm = mtod(m, struct cmsghdr *);
1475 clen = m->m_len;
1476
1477 while (cm != NULL) {
1478 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
1479 break;
1480
1481 data = CMSG_DATA(cm);
1482 datalen = (caddr_t)cm + cm->cmsg_len
1483 - (caddr_t)data;
1484
1485 if (cm->cmsg_level == SOL_SOCKET &&
1486 cm->cmsg_type == SCM_RIGHTS) {
1487 qfds = datalen / sizeof (struct file *);
1488 rp = data;
1489 for (i = 0; i < qfds; i++)
1490 (*op)(*rp++);
1491 }
1492
1493 if (CMSG_SPACE(datalen) < clen) {
1494 clen -= CMSG_SPACE(datalen);
1495 cm = (struct cmsghdr *)
1496 ((caddr_t)cm + CMSG_SPACE(datalen));
1497 } else {
1498 clen = 0;
1499 cm = NULL;
1500 }
1501 }
1502 }
1503 m0 = m0->m_act;
1504 }
1505 }
1506
1507 static void
1508 unp_mark(fp)
1509 struct file *fp;
1510 {
1511 if (fp->f_gcflag & FMARK)
1512 return;
1513 unp_defer++;
1514 fp->f_gcflag |= (FMARK|FDEFER);
1515 }
1516
1517 static void
1518 unp_discard(fp)
1519 struct file *fp;
1520 {
1521 FILE_LOCK(fp);
1522 fp->f_msgcount--;
1523 unp_rights--;
1524 FILE_UNLOCK(fp);
1525 (void) closef(fp, (struct thread *)NULL);
1526 }
Cache object: af2cc6ad9ec22514488b1edab64be9d1
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