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/5.0/sys/kern/uipc_usrreq.c 106096 2002-10-28 21:17:53Z rwatson $
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 return 0;
224 }
225
226 static int
227 uipc_rcvd(struct socket *so, int flags)
228 {
229 struct unpcb *unp = sotounpcb(so);
230 struct socket *so2;
231 u_long newhiwat;
232
233 if (unp == 0)
234 return EINVAL;
235 switch (so->so_type) {
236 case SOCK_DGRAM:
237 panic("uipc_rcvd DGRAM?");
238 /*NOTREACHED*/
239
240 case SOCK_STREAM:
241 if (unp->unp_conn == 0)
242 break;
243 so2 = unp->unp_conn->unp_socket;
244 /*
245 * Adjust backpressure on sender
246 * and wakeup any waiting to write.
247 */
248 so2->so_snd.sb_mbmax += unp->unp_mbcnt - so->so_rcv.sb_mbcnt;
249 unp->unp_mbcnt = so->so_rcv.sb_mbcnt;
250 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc -
251 so->so_rcv.sb_cc;
252 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
253 newhiwat, RLIM_INFINITY);
254 unp->unp_cc = so->so_rcv.sb_cc;
255 sowwakeup(so2);
256 break;
257
258 default:
259 panic("uipc_rcvd unknown socktype");
260 }
261 return 0;
262 }
263
264 /* pru_rcvoob is EOPNOTSUPP */
265
266 static int
267 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
268 struct mbuf *control, struct thread *td)
269 {
270 int error = 0;
271 struct unpcb *unp = sotounpcb(so);
272 struct socket *so2;
273 u_long newhiwat;
274
275 if (unp == 0) {
276 error = EINVAL;
277 goto release;
278 }
279 if (flags & PRUS_OOB) {
280 error = EOPNOTSUPP;
281 goto release;
282 }
283
284 if (control && (error = unp_internalize(&control, td)))
285 goto release;
286
287 switch (so->so_type) {
288 case SOCK_DGRAM:
289 {
290 struct sockaddr *from;
291
292 if (nam) {
293 if (unp->unp_conn) {
294 error = EISCONN;
295 break;
296 }
297 error = unp_connect(so, nam, td);
298 if (error)
299 break;
300 } else {
301 if (unp->unp_conn == 0) {
302 error = ENOTCONN;
303 break;
304 }
305 }
306 so2 = unp->unp_conn->unp_socket;
307 if (unp->unp_addr)
308 from = (struct sockaddr *)unp->unp_addr;
309 else
310 from = &sun_noname;
311 if (sbappendaddr(&so2->so_rcv, from, m, control)) {
312 sorwakeup(so2);
313 m = 0;
314 control = 0;
315 } else
316 error = ENOBUFS;
317 if (nam)
318 unp_disconnect(unp);
319 break;
320 }
321
322 case SOCK_STREAM:
323 /* Connect if not connected yet. */
324 /*
325 * Note: A better implementation would complain
326 * if not equal to the peer's address.
327 */
328 if ((so->so_state & SS_ISCONNECTED) == 0) {
329 if (nam) {
330 error = unp_connect(so, nam, td);
331 if (error)
332 break; /* XXX */
333 } else {
334 error = ENOTCONN;
335 break;
336 }
337 }
338
339 if (so->so_state & SS_CANTSENDMORE) {
340 error = EPIPE;
341 break;
342 }
343 if (unp->unp_conn == 0)
344 panic("uipc_send connected but no connection?");
345 so2 = unp->unp_conn->unp_socket;
346 /*
347 * Send to paired receive port, and then reduce
348 * send buffer hiwater marks to maintain backpressure.
349 * Wake up readers.
350 */
351 if (control) {
352 if (sbappendcontrol(&so2->so_rcv, m, control))
353 control = 0;
354 } else
355 sbappend(&so2->so_rcv, m);
356 so->so_snd.sb_mbmax -=
357 so2->so_rcv.sb_mbcnt - unp->unp_conn->unp_mbcnt;
358 unp->unp_conn->unp_mbcnt = so2->so_rcv.sb_mbcnt;
359 newhiwat = so->so_snd.sb_hiwat -
360 (so2->so_rcv.sb_cc - unp->unp_conn->unp_cc);
361 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
362 newhiwat, RLIM_INFINITY);
363 unp->unp_conn->unp_cc = so2->so_rcv.sb_cc;
364 sorwakeup(so2);
365 m = 0;
366 break;
367
368 default:
369 panic("uipc_send unknown socktype");
370 }
371
372 /*
373 * SEND_EOF is equivalent to a SEND followed by
374 * a SHUTDOWN.
375 */
376 if (flags & PRUS_EOF) {
377 socantsendmore(so);
378 unp_shutdown(unp);
379 }
380
381 if (control && error != 0)
382 unp_dispose(control);
383
384 release:
385 if (control)
386 m_freem(control);
387 if (m)
388 m_freem(m);
389 return error;
390 }
391
392 static int
393 uipc_sense(struct socket *so, struct stat *sb)
394 {
395 struct unpcb *unp = sotounpcb(so);
396 struct socket *so2;
397
398 if (unp == 0)
399 return EINVAL;
400 sb->st_blksize = so->so_snd.sb_hiwat;
401 if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) {
402 so2 = unp->unp_conn->unp_socket;
403 sb->st_blksize += so2->so_rcv.sb_cc;
404 }
405 sb->st_dev = NOUDEV;
406 if (unp->unp_ino == 0)
407 unp->unp_ino = unp_ino++;
408 sb->st_ino = unp->unp_ino;
409 return (0);
410 }
411
412 static int
413 uipc_shutdown(struct socket *so)
414 {
415 struct unpcb *unp = sotounpcb(so);
416
417 if (unp == 0)
418 return EINVAL;
419 socantsendmore(so);
420 unp_shutdown(unp);
421 return 0;
422 }
423
424 static int
425 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
426 {
427 struct unpcb *unp = sotounpcb(so);
428
429 if (unp == 0)
430 return EINVAL;
431 if (unp->unp_addr)
432 *nam = dup_sockaddr((struct sockaddr *)unp->unp_addr, 1);
433 else
434 *nam = dup_sockaddr((struct sockaddr *)&sun_noname, 1);
435 return 0;
436 }
437
438 struct pr_usrreqs uipc_usrreqs = {
439 uipc_abort, uipc_accept, uipc_attach, uipc_bind, uipc_connect,
440 uipc_connect2, pru_control_notsupp, uipc_detach, uipc_disconnect,
441 uipc_listen, uipc_peeraddr, uipc_rcvd, pru_rcvoob_notsupp,
442 uipc_send, uipc_sense, uipc_shutdown, uipc_sockaddr,
443 sosend, soreceive, sopoll
444 };
445
446 int
447 uipc_ctloutput(so, sopt)
448 struct socket *so;
449 struct sockopt *sopt;
450 {
451 struct unpcb *unp = sotounpcb(so);
452 int error;
453
454 switch (sopt->sopt_dir) {
455 case SOPT_GET:
456 switch (sopt->sopt_name) {
457 case LOCAL_PEERCRED:
458 if (unp->unp_flags & UNP_HAVEPC)
459 error = sooptcopyout(sopt, &unp->unp_peercred,
460 sizeof(unp->unp_peercred));
461 else {
462 if (so->so_type == SOCK_STREAM)
463 error = ENOTCONN;
464 else
465 error = EINVAL;
466 }
467 break;
468 default:
469 error = EOPNOTSUPP;
470 break;
471 }
472 break;
473 case SOPT_SET:
474 default:
475 error = EOPNOTSUPP;
476 break;
477 }
478 return (error);
479 }
480
481 /*
482 * Both send and receive buffers are allocated PIPSIZ bytes of buffering
483 * for stream sockets, although the total for sender and receiver is
484 * actually only PIPSIZ.
485 * Datagram sockets really use the sendspace as the maximum datagram size,
486 * and don't really want to reserve the sendspace. Their recvspace should
487 * be large enough for at least one max-size datagram plus address.
488 */
489 #ifndef PIPSIZ
490 #define PIPSIZ 8192
491 #endif
492 static u_long unpst_sendspace = PIPSIZ;
493 static u_long unpst_recvspace = PIPSIZ;
494 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
495 static u_long unpdg_recvspace = 4*1024;
496
497 static int unp_rights; /* file descriptors in flight */
498
499 SYSCTL_DECL(_net_local_stream);
500 SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
501 &unpst_sendspace, 0, "");
502 SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
503 &unpst_recvspace, 0, "");
504 SYSCTL_DECL(_net_local_dgram);
505 SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
506 &unpdg_sendspace, 0, "");
507 SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
508 &unpdg_recvspace, 0, "");
509 SYSCTL_DECL(_net_local);
510 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "");
511
512 static int
513 unp_attach(so)
514 struct socket *so;
515 {
516 register struct unpcb *unp;
517 int error;
518
519 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
520 switch (so->so_type) {
521
522 case SOCK_STREAM:
523 error = soreserve(so, unpst_sendspace, unpst_recvspace);
524 break;
525
526 case SOCK_DGRAM:
527 error = soreserve(so, unpdg_sendspace, unpdg_recvspace);
528 break;
529
530 default:
531 panic("unp_attach");
532 }
533 if (error)
534 return (error);
535 }
536 unp = uma_zalloc(unp_zone, M_WAITOK);
537 if (unp == NULL)
538 return (ENOBUFS);
539 bzero(unp, sizeof *unp);
540 unp->unp_gencnt = ++unp_gencnt;
541 unp_count++;
542 LIST_INIT(&unp->unp_refs);
543 unp->unp_socket = so;
544 FILEDESC_LOCK(curproc->p_fd);
545 unp->unp_rvnode = curthread->td_proc->p_fd->fd_rdir;
546 FILEDESC_UNLOCK(curproc->p_fd);
547 LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? &unp_dhead
548 : &unp_shead, unp, unp_link);
549 so->so_pcb = unp;
550 return (0);
551 }
552
553 static void
554 unp_detach(unp)
555 register struct unpcb *unp;
556 {
557 LIST_REMOVE(unp, unp_link);
558 unp->unp_gencnt = ++unp_gencnt;
559 --unp_count;
560 if (unp->unp_vnode) {
561 unp->unp_vnode->v_socket = 0;
562 vrele(unp->unp_vnode);
563 unp->unp_vnode = 0;
564 }
565 if (unp->unp_conn)
566 unp_disconnect(unp);
567 while (!LIST_EMPTY(&unp->unp_refs))
568 unp_drop(LIST_FIRST(&unp->unp_refs), ECONNRESET);
569 soisdisconnected(unp->unp_socket);
570 unp->unp_socket->so_pcb = 0;
571 if (unp_rights) {
572 /*
573 * Normally the receive buffer is flushed later,
574 * in sofree, but if our receive buffer holds references
575 * to descriptors that are now garbage, we will dispose
576 * of those descriptor references after the garbage collector
577 * gets them (resulting in a "panic: closef: count < 0").
578 */
579 sorflush(unp->unp_socket);
580 unp_gc();
581 }
582 if (unp->unp_addr)
583 FREE(unp->unp_addr, M_SONAME);
584 uma_zfree(unp_zone, unp);
585 }
586
587 static int
588 unp_bind(unp, nam, td)
589 struct unpcb *unp;
590 struct sockaddr *nam;
591 struct thread *td;
592 {
593 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
594 struct vnode *vp;
595 struct mount *mp;
596 struct vattr vattr;
597 int error, namelen;
598 struct nameidata nd;
599 char *buf;
600
601 if (unp->unp_vnode != NULL)
602 return (EINVAL);
603
604 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
605 if (namelen <= 0)
606 return EINVAL;
607
608 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
609 strlcpy(buf, soun->sun_path, namelen + 1);
610
611 restart:
612 NDINIT(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME, UIO_SYSSPACE,
613 buf, td);
614 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
615 error = namei(&nd);
616 if (error) {
617 free(buf, M_TEMP);
618 return (error);
619 }
620 vp = nd.ni_vp;
621 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
622 NDFREE(&nd, NDF_ONLY_PNBUF);
623 if (nd.ni_dvp == vp)
624 vrele(nd.ni_dvp);
625 else
626 vput(nd.ni_dvp);
627 if (vp != NULL) {
628 vrele(vp);
629 free(buf, M_TEMP);
630 return (EADDRINUSE);
631 }
632 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
633 if (error) {
634 free(buf, M_TEMP);
635 return (error);
636 }
637 goto restart;
638 }
639 VATTR_NULL(&vattr);
640 vattr.va_type = VSOCK;
641 FILEDESC_LOCK(td->td_proc->p_fd);
642 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
643 FILEDESC_UNLOCK(td->td_proc->p_fd);
644 #ifdef MAC
645 error = mac_check_vnode_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
646 &vattr);
647 #endif
648 if (error == 0) {
649 VOP_LEASE(nd.ni_dvp, td, td->td_ucred, LEASE_WRITE);
650 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
651 }
652 NDFREE(&nd, NDF_ONLY_PNBUF);
653 vput(nd.ni_dvp);
654 if (error) {
655 free(buf, M_TEMP);
656 return (error);
657 }
658 vp = nd.ni_vp;
659 vp->v_socket = unp->unp_socket;
660 unp->unp_vnode = vp;
661 unp->unp_addr = (struct sockaddr_un *)dup_sockaddr(nam, 1);
662 VOP_UNLOCK(vp, 0, td);
663 vn_finished_write(mp);
664 free(buf, M_TEMP);
665 return (0);
666 }
667
668 static int
669 unp_connect(so, nam, td)
670 struct socket *so;
671 struct sockaddr *nam;
672 struct thread *td;
673 {
674 register struct sockaddr_un *soun = (struct sockaddr_un *)nam;
675 register struct vnode *vp;
676 register struct socket *so2, *so3;
677 struct unpcb *unp, *unp2, *unp3;
678 int error, len;
679 struct nameidata nd;
680 char buf[SOCK_MAXADDRLEN];
681
682 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
683 if (len <= 0)
684 return EINVAL;
685 strlcpy(buf, soun->sun_path, len + 1);
686
687 NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, buf, td);
688 error = namei(&nd);
689 if (error)
690 return (error);
691 vp = nd.ni_vp;
692 NDFREE(&nd, NDF_ONLY_PNBUF);
693 if (vp->v_type != VSOCK) {
694 error = ENOTSOCK;
695 goto bad;
696 }
697 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
698 if (error)
699 goto bad;
700 so2 = vp->v_socket;
701 if (so2 == 0) {
702 error = ECONNREFUSED;
703 goto bad;
704 }
705 if (so->so_type != so2->so_type) {
706 error = EPROTOTYPE;
707 goto bad;
708 }
709 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
710 if ((so2->so_options & SO_ACCEPTCONN) == 0 ||
711 (so3 = sonewconn(so2, 0)) == 0) {
712 error = ECONNREFUSED;
713 goto bad;
714 }
715 unp = sotounpcb(so);
716 unp2 = sotounpcb(so2);
717 unp3 = sotounpcb(so3);
718 if (unp2->unp_addr)
719 unp3->unp_addr = (struct sockaddr_un *)
720 dup_sockaddr((struct sockaddr *)
721 unp2->unp_addr, 1);
722
723 /*
724 * unp_peercred management:
725 *
726 * The connecter's (client's) credentials are copied
727 * from its process structure at the time of connect()
728 * (which is now).
729 */
730 cru2x(td->td_ucred, &unp3->unp_peercred);
731 unp3->unp_flags |= UNP_HAVEPC;
732 /*
733 * The receiver's (server's) credentials are copied
734 * from the unp_peercred member of socket on which the
735 * former called listen(); unp_listen() cached that
736 * process's credentials at that time so we can use
737 * them now.
738 */
739 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
740 ("unp_connect: listener without cached peercred"));
741 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
742 sizeof(unp->unp_peercred));
743 unp->unp_flags |= UNP_HAVEPC;
744 #ifdef MAC
745 mac_set_socket_peer_from_socket(so, so3);
746 mac_set_socket_peer_from_socket(so3, so);
747 #endif
748
749 so2 = so3;
750 }
751 error = unp_connect2(so, so2);
752 bad:
753 vput(vp);
754 return (error);
755 }
756
757 int
758 unp_connect2(so, so2)
759 register struct socket *so;
760 register struct socket *so2;
761 {
762 register struct unpcb *unp = sotounpcb(so);
763 register struct unpcb *unp2;
764
765 if (so2->so_type != so->so_type)
766 return (EPROTOTYPE);
767 unp2 = sotounpcb(so2);
768 unp->unp_conn = unp2;
769 switch (so->so_type) {
770
771 case SOCK_DGRAM:
772 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
773 soisconnected(so);
774 break;
775
776 case SOCK_STREAM:
777 unp2->unp_conn = unp;
778 soisconnected(so);
779 soisconnected(so2);
780 break;
781
782 default:
783 panic("unp_connect2");
784 }
785 return (0);
786 }
787
788 static void
789 unp_disconnect(unp)
790 struct unpcb *unp;
791 {
792 register struct unpcb *unp2 = unp->unp_conn;
793
794 if (unp2 == 0)
795 return;
796 unp->unp_conn = 0;
797 switch (unp->unp_socket->so_type) {
798
799 case SOCK_DGRAM:
800 LIST_REMOVE(unp, unp_reflink);
801 unp->unp_socket->so_state &= ~SS_ISCONNECTED;
802 break;
803
804 case SOCK_STREAM:
805 soisdisconnected(unp->unp_socket);
806 unp2->unp_conn = 0;
807 soisdisconnected(unp2->unp_socket);
808 break;
809 }
810 }
811
812 #ifdef notdef
813 void
814 unp_abort(unp)
815 struct unpcb *unp;
816 {
817
818 unp_detach(unp);
819 }
820 #endif
821
822 static int
823 unp_pcblist(SYSCTL_HANDLER_ARGS)
824 {
825 int error, i, n;
826 struct unpcb *unp, **unp_list;
827 unp_gen_t gencnt;
828 struct xunpgen *xug;
829 struct unp_head *head;
830 struct xunpcb *xu;
831
832 head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead);
833
834 /*
835 * The process of preparing the PCB list is too time-consuming and
836 * resource-intensive to repeat twice on every request.
837 */
838 if (req->oldptr == 0) {
839 n = unp_count;
840 req->oldidx = 2 * (sizeof *xug)
841 + (n + n/8) * sizeof(struct xunpcb);
842 return 0;
843 }
844
845 if (req->newptr != 0)
846 return EPERM;
847
848 /*
849 * OK, now we're committed to doing something.
850 */
851 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
852 gencnt = unp_gencnt;
853 n = unp_count;
854
855 xug->xug_len = sizeof *xug;
856 xug->xug_count = n;
857 xug->xug_gen = gencnt;
858 xug->xug_sogen = so_gencnt;
859 error = SYSCTL_OUT(req, xug, sizeof *xug);
860 if (error) {
861 free(xug, M_TEMP);
862 return error;
863 }
864
865 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
866
867 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
868 unp = LIST_NEXT(unp, unp_link)) {
869 if (unp->unp_gencnt <= gencnt) {
870 if (cr_cansee(req->td->td_ucred,
871 unp->unp_socket->so_cred))
872 continue;
873 unp_list[i++] = unp;
874 }
875 }
876 n = i; /* in case we lost some during malloc */
877
878 error = 0;
879 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK);
880 for (i = 0; i < n; i++) {
881 unp = unp_list[i];
882 if (unp->unp_gencnt <= gencnt) {
883 xu->xu_len = sizeof *xu;
884 xu->xu_unpp = unp;
885 /*
886 * XXX - need more locking here to protect against
887 * connect/disconnect races for SMP.
888 */
889 if (unp->unp_addr)
890 bcopy(unp->unp_addr, &xu->xu_addr,
891 unp->unp_addr->sun_len);
892 if (unp->unp_conn && unp->unp_conn->unp_addr)
893 bcopy(unp->unp_conn->unp_addr,
894 &xu->xu_caddr,
895 unp->unp_conn->unp_addr->sun_len);
896 bcopy(unp, &xu->xu_unp, sizeof *unp);
897 sotoxsocket(unp->unp_socket, &xu->xu_socket);
898 error = SYSCTL_OUT(req, xu, sizeof *xu);
899 }
900 }
901 free(xu, M_TEMP);
902 if (!error) {
903 /*
904 * Give the user an updated idea of our state.
905 * If the generation differs from what we told
906 * her before, she knows that something happened
907 * while we were processing this request, and it
908 * might be necessary to retry.
909 */
910 xug->xug_gen = unp_gencnt;
911 xug->xug_sogen = so_gencnt;
912 xug->xug_count = unp_count;
913 error = SYSCTL_OUT(req, xug, sizeof *xug);
914 }
915 free(unp_list, M_TEMP);
916 free(xug, M_TEMP);
917 return error;
918 }
919
920 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLFLAG_RD,
921 (caddr_t)(long)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
922 "List of active local datagram sockets");
923 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLFLAG_RD,
924 (caddr_t)(long)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
925 "List of active local stream sockets");
926
927 static void
928 unp_shutdown(unp)
929 struct unpcb *unp;
930 {
931 struct socket *so;
932
933 if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn &&
934 (so = unp->unp_conn->unp_socket))
935 socantrcvmore(so);
936 }
937
938 static void
939 unp_drop(unp, errno)
940 struct unpcb *unp;
941 int errno;
942 {
943 struct socket *so = unp->unp_socket;
944
945 so->so_error = errno;
946 unp_disconnect(unp);
947 }
948
949 #ifdef notdef
950 void
951 unp_drain()
952 {
953
954 }
955 #endif
956
957 static void
958 unp_freerights(rp, fdcount)
959 struct file **rp;
960 int fdcount;
961 {
962 int i;
963 struct file *fp;
964
965 for (i = 0; i < fdcount; i++) {
966 fp = *rp;
967 /*
968 * zero the pointer before calling
969 * unp_discard since it may end up
970 * in unp_gc()..
971 */
972 *rp++ = 0;
973 unp_discard(fp);
974 }
975 }
976
977 int
978 unp_externalize(control, controlp)
979 struct mbuf *control, **controlp;
980 {
981 struct thread *td = curthread; /* XXX */
982 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
983 int i;
984 int *fdp;
985 struct file **rp;
986 struct file *fp;
987 void *data;
988 socklen_t clen = control->m_len, datalen;
989 int error, newfds;
990 int f;
991 u_int newlen;
992
993 error = 0;
994 if (controlp != NULL) /* controlp == NULL => free control messages */
995 *controlp = NULL;
996
997 while (cm != NULL) {
998 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
999 error = EINVAL;
1000 break;
1001 }
1002
1003 data = CMSG_DATA(cm);
1004 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1005
1006 if (cm->cmsg_level == SOL_SOCKET
1007 && cm->cmsg_type == SCM_RIGHTS) {
1008 newfds = datalen / sizeof(struct file *);
1009 rp = data;
1010
1011 /* If we're not outputting the discriptors free them. */
1012 if (error || controlp == NULL) {
1013 unp_freerights(rp, newfds);
1014 goto next;
1015 }
1016 FILEDESC_LOCK(td->td_proc->p_fd);
1017 /* if the new FD's will not fit free them. */
1018 if (!fdavail(td, newfds)) {
1019 FILEDESC_UNLOCK(td->td_proc->p_fd);
1020 error = EMSGSIZE;
1021 unp_freerights(rp, newfds);
1022 goto next;
1023 }
1024 /*
1025 * now change each pointer to an fd in the global
1026 * table to an integer that is the index to the
1027 * local fd table entry that we set up to point
1028 * to the global one we are transferring.
1029 */
1030 newlen = newfds * sizeof(int);
1031 *controlp = sbcreatecontrol(NULL, newlen,
1032 SCM_RIGHTS, SOL_SOCKET);
1033 if (*controlp == NULL) {
1034 FILEDESC_UNLOCK(td->td_proc->p_fd);
1035 error = E2BIG;
1036 unp_freerights(rp, newfds);
1037 goto next;
1038 }
1039
1040 fdp = (int *)
1041 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1042 for (i = 0; i < newfds; i++) {
1043 if (fdalloc(td, 0, &f))
1044 panic("unp_externalize fdalloc failed");
1045 fp = *rp++;
1046 td->td_proc->p_fd->fd_ofiles[f] = fp;
1047 FILE_LOCK(fp);
1048 fp->f_msgcount--;
1049 FILE_UNLOCK(fp);
1050 unp_rights--;
1051 *fdp++ = f;
1052 }
1053 FILEDESC_UNLOCK(td->td_proc->p_fd);
1054 } else { /* We can just copy anything else across */
1055 if (error || controlp == NULL)
1056 goto next;
1057 *controlp = sbcreatecontrol(NULL, datalen,
1058 cm->cmsg_type, cm->cmsg_level);
1059 if (*controlp == NULL) {
1060 error = ENOBUFS;
1061 goto next;
1062 }
1063 bcopy(data,
1064 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1065 datalen);
1066 }
1067
1068 controlp = &(*controlp)->m_next;
1069
1070 next:
1071 if (CMSG_SPACE(datalen) < clen) {
1072 clen -= CMSG_SPACE(datalen);
1073 cm = (struct cmsghdr *)
1074 ((caddr_t)cm + CMSG_SPACE(datalen));
1075 } else {
1076 clen = 0;
1077 cm = NULL;
1078 }
1079 }
1080
1081 m_freem(control);
1082
1083 return (error);
1084 }
1085
1086 void
1087 unp_init(void)
1088 {
1089 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1090 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
1091 uma_zone_set_max(unp_zone, nmbclusters);
1092 if (unp_zone == 0)
1093 panic("unp_init");
1094 LIST_INIT(&unp_dhead);
1095 LIST_INIT(&unp_shead);
1096 }
1097
1098 #ifndef MIN
1099 #define MIN(a,b) (((a)<(b))?(a):(b))
1100 #endif
1101
1102 static int
1103 unp_internalize(controlp, td)
1104 struct mbuf **controlp;
1105 struct thread *td;
1106 {
1107 struct mbuf *control = *controlp;
1108 struct proc *p = td->td_proc;
1109 struct filedesc *fdescp = p->p_fd;
1110 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1111 struct cmsgcred *cmcred;
1112 struct file **rp;
1113 struct file *fp;
1114 struct timeval *tv;
1115 int i, fd, *fdp;
1116 void *data;
1117 socklen_t clen = control->m_len, datalen;
1118 int error, oldfds;
1119 u_int newlen;
1120
1121 error = 0;
1122 *controlp = NULL;
1123
1124 while (cm != NULL) {
1125 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1126 || cm->cmsg_len > clen) {
1127 error = EINVAL;
1128 goto out;
1129 }
1130
1131 data = CMSG_DATA(cm);
1132 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1133
1134 switch (cm->cmsg_type) {
1135 /*
1136 * Fill in credential information.
1137 */
1138 case SCM_CREDS:
1139 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1140 SCM_CREDS, SOL_SOCKET);
1141 if (*controlp == NULL) {
1142 error = ENOBUFS;
1143 goto out;
1144 }
1145
1146 cmcred = (struct cmsgcred *)
1147 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1148 cmcred->cmcred_pid = p->p_pid;
1149 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1150 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1151 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1152 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1153 CMGROUP_MAX);
1154 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1155 cmcred->cmcred_groups[i] =
1156 td->td_ucred->cr_groups[i];
1157 break;
1158
1159 case SCM_RIGHTS:
1160 oldfds = datalen / sizeof (int);
1161 /*
1162 * check that all the FDs passed in refer to legal files
1163 * If not, reject the entire operation.
1164 */
1165 fdp = data;
1166 FILEDESC_LOCK(fdescp);
1167 for (i = 0; i < oldfds; i++) {
1168 fd = *fdp++;
1169 if ((unsigned)fd >= fdescp->fd_nfiles ||
1170 fdescp->fd_ofiles[fd] == NULL) {
1171 FILEDESC_UNLOCK(fdescp);
1172 error = EBADF;
1173 goto out;
1174 }
1175 }
1176 /*
1177 * Now replace the integer FDs with pointers to
1178 * the associated global file table entry..
1179 */
1180 newlen = oldfds * sizeof(struct file *);
1181 *controlp = sbcreatecontrol(NULL, newlen,
1182 SCM_RIGHTS, SOL_SOCKET);
1183 if (*controlp == NULL) {
1184 FILEDESC_UNLOCK(fdescp);
1185 error = E2BIG;
1186 goto out;
1187 }
1188
1189 fdp = data;
1190 rp = (struct file **)
1191 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1192 for (i = 0; i < oldfds; i++) {
1193 fp = fdescp->fd_ofiles[*fdp++];
1194 *rp++ = fp;
1195 FILE_LOCK(fp);
1196 fp->f_count++;
1197 fp->f_msgcount++;
1198 FILE_UNLOCK(fp);
1199 unp_rights++;
1200 }
1201 FILEDESC_UNLOCK(fdescp);
1202 break;
1203
1204 case SCM_TIMESTAMP:
1205 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1206 SCM_TIMESTAMP, SOL_SOCKET);
1207 if (*controlp == NULL) {
1208 error = ENOBUFS;
1209 goto out;
1210 }
1211 tv = (struct timeval *)
1212 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1213 microtime(tv);
1214 break;
1215
1216 default:
1217 error = EINVAL;
1218 goto out;
1219 }
1220
1221 controlp = &(*controlp)->m_next;
1222
1223 if (CMSG_SPACE(datalen) < clen) {
1224 clen -= CMSG_SPACE(datalen);
1225 cm = (struct cmsghdr *)
1226 ((caddr_t)cm + CMSG_SPACE(datalen));
1227 } else {
1228 clen = 0;
1229 cm = NULL;
1230 }
1231 }
1232
1233 out:
1234 m_freem(control);
1235
1236 return (error);
1237 }
1238
1239 static int unp_defer, unp_gcing;
1240
1241 static void
1242 unp_gc()
1243 {
1244 register struct file *fp, *nextfp;
1245 register struct socket *so;
1246 struct file **extra_ref, **fpp;
1247 int nunref, i;
1248
1249 if (unp_gcing)
1250 return;
1251 unp_gcing = 1;
1252 unp_defer = 0;
1253 /*
1254 * before going through all this, set all FDs to
1255 * be NOT defered and NOT externally accessible
1256 */
1257 sx_slock(&filelist_lock);
1258 LIST_FOREACH(fp, &filehead, f_list)
1259 fp->f_gcflag &= ~(FMARK|FDEFER);
1260 do {
1261 LIST_FOREACH(fp, &filehead, f_list) {
1262 FILE_LOCK(fp);
1263 /*
1264 * If the file is not open, skip it
1265 */
1266 if (fp->f_count == 0) {
1267 FILE_UNLOCK(fp);
1268 continue;
1269 }
1270 /*
1271 * If we already marked it as 'defer' in a
1272 * previous pass, then try process it this time
1273 * and un-mark it
1274 */
1275 if (fp->f_gcflag & FDEFER) {
1276 fp->f_gcflag &= ~FDEFER;
1277 unp_defer--;
1278 } else {
1279 /*
1280 * if it's not defered, then check if it's
1281 * already marked.. if so skip it
1282 */
1283 if (fp->f_gcflag & FMARK) {
1284 FILE_UNLOCK(fp);
1285 continue;
1286 }
1287 /*
1288 * If all references are from messages
1289 * in transit, then skip it. it's not
1290 * externally accessible.
1291 */
1292 if (fp->f_count == fp->f_msgcount) {
1293 FILE_UNLOCK(fp);
1294 continue;
1295 }
1296 /*
1297 * If it got this far then it must be
1298 * externally accessible.
1299 */
1300 fp->f_gcflag |= FMARK;
1301 }
1302 /*
1303 * either it was defered, or it is externally
1304 * accessible and not already marked so.
1305 * Now check if it is possibly one of OUR sockets.
1306 */
1307 if (fp->f_type != DTYPE_SOCKET ||
1308 (so = (struct socket *)fp->f_data) == 0) {
1309 FILE_UNLOCK(fp);
1310 continue;
1311 }
1312 FILE_UNLOCK(fp);
1313 if (so->so_proto->pr_domain != &localdomain ||
1314 (so->so_proto->pr_flags&PR_RIGHTS) == 0)
1315 continue;
1316 #ifdef notdef
1317 if (so->so_rcv.sb_flags & SB_LOCK) {
1318 /*
1319 * This is problematical; it's not clear
1320 * we need to wait for the sockbuf to be
1321 * unlocked (on a uniprocessor, at least),
1322 * and it's also not clear what to do
1323 * if sbwait returns an error due to receipt
1324 * of a signal. If sbwait does return
1325 * an error, we'll go into an infinite
1326 * loop. Delete all of this for now.
1327 */
1328 (void) sbwait(&so->so_rcv);
1329 goto restart;
1330 }
1331 #endif
1332 /*
1333 * So, Ok, it's one of our sockets and it IS externally
1334 * accessible (or was defered). Now we look
1335 * to see if we hold any file descriptors in its
1336 * message buffers. Follow those links and mark them
1337 * as accessible too.
1338 */
1339 unp_scan(so->so_rcv.sb_mb, unp_mark);
1340 }
1341 } while (unp_defer);
1342 sx_sunlock(&filelist_lock);
1343 /*
1344 * We grab an extra reference to each of the file table entries
1345 * that are not otherwise accessible and then free the rights
1346 * that are stored in messages on them.
1347 *
1348 * The bug in the orginal code is a little tricky, so I'll describe
1349 * what's wrong with it here.
1350 *
1351 * It is incorrect to simply unp_discard each entry for f_msgcount
1352 * times -- consider the case of sockets A and B that contain
1353 * references to each other. On a last close of some other socket,
1354 * we trigger a gc since the number of outstanding rights (unp_rights)
1355 * is non-zero. If during the sweep phase the gc code un_discards,
1356 * we end up doing a (full) closef on the descriptor. A closef on A
1357 * results in the following chain. Closef calls soo_close, which
1358 * calls soclose. Soclose calls first (through the switch
1359 * uipc_usrreq) unp_detach, which re-invokes unp_gc. Unp_gc simply
1360 * returns because the previous instance had set unp_gcing, and
1361 * we return all the way back to soclose, which marks the socket
1362 * with SS_NOFDREF, and then calls sofree. Sofree calls sorflush
1363 * to free up the rights that are queued in messages on the socket A,
1364 * i.e., the reference on B. The sorflush calls via the dom_dispose
1365 * switch unp_dispose, which unp_scans with unp_discard. This second
1366 * instance of unp_discard just calls closef on B.
1367 *
1368 * Well, a similar chain occurs on B, resulting in a sorflush on B,
1369 * which results in another closef on A. Unfortunately, A is already
1370 * being closed, and the descriptor has already been marked with
1371 * SS_NOFDREF, and soclose panics at this point.
1372 *
1373 * Here, we first take an extra reference to each inaccessible
1374 * descriptor. Then, we call sorflush ourself, since we know
1375 * it is a Unix domain socket anyhow. After we destroy all the
1376 * rights carried in messages, we do a last closef to get rid
1377 * of our extra reference. This is the last close, and the
1378 * unp_detach etc will shut down the socket.
1379 *
1380 * 91/09/19, bsy@cs.cmu.edu
1381 */
1382 extra_ref = malloc(nfiles * sizeof(struct file *), M_TEMP, M_WAITOK);
1383 sx_slock(&filelist_lock);
1384 for (nunref = 0, fp = LIST_FIRST(&filehead), fpp = extra_ref; fp != 0;
1385 fp = nextfp) {
1386 nextfp = LIST_NEXT(fp, f_list);
1387 FILE_LOCK(fp);
1388 /*
1389 * If it's not open, skip it
1390 */
1391 if (fp->f_count == 0) {
1392 FILE_UNLOCK(fp);
1393 continue;
1394 }
1395 /*
1396 * If all refs are from msgs, and it's not marked accessible
1397 * then it must be referenced from some unreachable cycle
1398 * of (shut-down) FDs, so include it in our
1399 * list of FDs to remove
1400 */
1401 if (fp->f_count == fp->f_msgcount && !(fp->f_gcflag & FMARK)) {
1402 *fpp++ = fp;
1403 nunref++;
1404 fp->f_count++;
1405 }
1406 FILE_UNLOCK(fp);
1407 }
1408 sx_sunlock(&filelist_lock);
1409 /*
1410 * for each FD on our hit list, do the following two things
1411 */
1412 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) {
1413 struct file *tfp = *fpp;
1414 FILE_LOCK(tfp);
1415 if (tfp->f_type == DTYPE_SOCKET && tfp->f_data != NULL) {
1416 FILE_UNLOCK(tfp);
1417 sorflush((struct socket *)(tfp->f_data));
1418 } else
1419 FILE_UNLOCK(tfp);
1420 }
1421 for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp)
1422 closef(*fpp, (struct thread *) NULL);
1423 free(extra_ref, M_TEMP);
1424 unp_gcing = 0;
1425 }
1426
1427 void
1428 unp_dispose(m)
1429 struct mbuf *m;
1430 {
1431
1432 if (m)
1433 unp_scan(m, unp_discard);
1434 }
1435
1436 static int
1437 unp_listen(unp, td)
1438 struct unpcb *unp;
1439 struct thread *td;
1440 {
1441
1442 cru2x(td->td_ucred, &unp->unp_peercred);
1443 unp->unp_flags |= UNP_HAVEPCCACHED;
1444 return (0);
1445 }
1446
1447 static void
1448 unp_scan(m0, op)
1449 register struct mbuf *m0;
1450 void (*op)(struct file *);
1451 {
1452 struct mbuf *m;
1453 struct file **rp;
1454 struct cmsghdr *cm;
1455 void *data;
1456 int i;
1457 socklen_t clen, datalen;
1458 int qfds;
1459
1460 while (m0) {
1461 for (m = m0; m; m = m->m_next) {
1462 if (m->m_type != MT_CONTROL)
1463 continue;
1464
1465 cm = mtod(m, struct cmsghdr *);
1466 clen = m->m_len;
1467
1468 while (cm != NULL) {
1469 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
1470 break;
1471
1472 data = CMSG_DATA(cm);
1473 datalen = (caddr_t)cm + cm->cmsg_len
1474 - (caddr_t)data;
1475
1476 if (cm->cmsg_level == SOL_SOCKET &&
1477 cm->cmsg_type == SCM_RIGHTS) {
1478 qfds = datalen / sizeof (struct file *);
1479 rp = data;
1480 for (i = 0; i < qfds; i++)
1481 (*op)(*rp++);
1482 }
1483
1484 if (CMSG_SPACE(datalen) < clen) {
1485 clen -= CMSG_SPACE(datalen);
1486 cm = (struct cmsghdr *)
1487 ((caddr_t)cm + CMSG_SPACE(datalen));
1488 } else {
1489 clen = 0;
1490 cm = NULL;
1491 }
1492 }
1493 }
1494 m0 = m0->m_act;
1495 }
1496 }
1497
1498 static void
1499 unp_mark(fp)
1500 struct file *fp;
1501 {
1502 if (fp->f_gcflag & FMARK)
1503 return;
1504 unp_defer++;
1505 fp->f_gcflag |= (FMARK|FDEFER);
1506 }
1507
1508 static void
1509 unp_discard(fp)
1510 struct file *fp;
1511 {
1512 FILE_LOCK(fp);
1513 fp->f_msgcount--;
1514 unp_rights--;
1515 FILE_UNLOCK(fp);
1516 (void) closef(fp, (struct thread *)NULL);
1517 }
Cache object: 195c3b28f7c36cdee9ac347afb87ef7d
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