1 | /* |
2 | * Copyright (c) 2000-2021 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Copyright (c) 1982, 1986, 1989, 1991, 1993 |
30 | * The Regents of the University of California. All rights reserved. |
31 | * |
32 | * Redistribution and use in source and binary forms, with or without |
33 | * modification, are permitted provided that the following conditions |
34 | * are met: |
35 | * 1. Redistributions of source code must retain the above copyright |
36 | * notice, this list of conditions and the following disclaimer. |
37 | * 2. Redistributions in binary form must reproduce the above copyright |
38 | * notice, this list of conditions and the following disclaimer in the |
39 | * documentation and/or other materials provided with the distribution. |
40 | * 3. All advertising materials mentioning features or use of this software |
41 | * must display the following acknowledgement: |
42 | * This product includes software developed by the University of |
43 | * California, Berkeley and its contributors. |
44 | * 4. Neither the name of the University nor the names of its contributors |
45 | * may be used to endorse or promote products derived from this software |
46 | * without specific prior written permission. |
47 | * |
48 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
49 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
50 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
51 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
52 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
53 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
54 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
55 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
56 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
57 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
58 | * SUCH DAMAGE. |
59 | * |
60 | * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94 |
61 | */ |
62 | /* |
63 | * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce |
64 | * support for mandatory and extensible security protections. This notice |
65 | * is included in support of clause 2.2 (b) of the Apple Public License, |
66 | * Version 2.0. |
67 | */ |
68 | #include <os/log.h> |
69 | #include <sys/param.h> |
70 | #include <sys/systm.h> |
71 | #include <sys/kernel.h> |
72 | #include <sys/domain.h> |
73 | #include <sys/fcntl.h> |
74 | #include <sys/malloc.h> /* XXX must be before <sys/file.h> */ |
75 | #include <sys/file_internal.h> |
76 | #include <sys/guarded.h> |
77 | #include <sys/filedesc.h> |
78 | #include <sys/lock.h> |
79 | #include <sys/mbuf.h> |
80 | #include <sys/namei.h> |
81 | #include <sys/proc_internal.h> |
82 | #include <sys/kauth.h> |
83 | #include <sys/protosw.h> |
84 | #include <sys/socket.h> |
85 | #include <sys/socketvar.h> |
86 | #include <sys/stat.h> |
87 | #include <sys/sysctl.h> |
88 | #include <sys/un.h> |
89 | #include <sys/unpcb.h> |
90 | #include <sys/vnode_internal.h> |
91 | #include <sys/kdebug.h> |
92 | #include <sys/mcache.h> |
93 | |
94 | #include <kern/zalloc.h> |
95 | #include <kern/locks.h> |
96 | #include <kern/task.h> |
97 | |
98 | #include <net/sockaddr_utils.h> |
99 | |
100 | #if __has_ptrcheck |
101 | #include <machine/trap.h> |
102 | #endif /* __has_ptrcheck */ |
103 | |
104 | #if CONFIG_MACF |
105 | #include <security/mac_framework.h> |
106 | #endif /* CONFIG_MACF */ |
107 | |
108 | #include <mach/vm_param.h> |
109 | |
110 | #ifndef ROUNDUP64 |
111 | #define ROUNDUP64(x) P2ROUNDUP((x), sizeof (u_int64_t)) |
112 | #endif |
113 | |
114 | #ifndef ADVANCE64 |
115 | #define ADVANCE64(p, n) (void*)((char *)(p) + ROUNDUP64(n)) |
116 | #endif |
117 | |
118 | /* |
119 | * Maximum number of FDs that can be passed in an mbuf |
120 | */ |
121 | #define UIPC_MAX_CMSG_FD 512 |
122 | |
123 | ZONE_DEFINE_TYPE(unp_zone, "unpzone" , struct unpcb, ZC_NONE); |
124 | static unp_gen_t unp_gencnt; |
125 | static u_int unp_count; |
126 | |
127 | static LCK_ATTR_DECLARE(unp_mtx_attr, 0, 0); |
128 | static LCK_GRP_DECLARE(unp_mtx_grp, "unp_list" ); |
129 | static LCK_RW_DECLARE_ATTR(unp_list_mtx, &unp_mtx_grp, &unp_mtx_attr); |
130 | |
131 | static LCK_MTX_DECLARE_ATTR(unp_disconnect_lock, &unp_mtx_grp, &unp_mtx_attr); |
132 | static LCK_MTX_DECLARE_ATTR(unp_connect_lock, &unp_mtx_grp, &unp_mtx_attr); |
133 | static LCK_MTX_DECLARE_ATTR(uipc_lock, &unp_mtx_grp, &unp_mtx_attr); |
134 | |
135 | static u_int disconnect_in_progress; |
136 | |
137 | static struct unp_head unp_shead, unp_dhead; |
138 | static int unp_defer; |
139 | static thread_call_t unp_gc_tcall; |
140 | static LIST_HEAD(, fileglob) unp_msghead = LIST_HEAD_INITIALIZER(unp_msghead); |
141 | |
142 | SYSCTL_DECL(_net_local); |
143 | |
144 | static int unp_rights; /* file descriptors in flight */ |
145 | static int unp_disposed; /* discarded file descriptors */ |
146 | |
147 | SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD | CTLFLAG_LOCKED, &unp_rights, 0, "" ); |
148 | |
149 | #define ULEF_CONNECTION 0x01 |
150 | uint32_t unp_log_enable_flags = 0; |
151 | |
152 | SYSCTL_UINT(_net_local, OID_AUTO, log, CTLFLAG_RD | CTLFLAG_LOCKED, |
153 | &unp_log_enable_flags, 0, "" ); |
154 | |
155 | |
156 | /* |
157 | * mDNSResponder tracing. When enabled, endpoints connected to |
158 | * /var/run/mDNSResponder will be traced; during each send on |
159 | * the traced socket, we log the PID and process name of the |
160 | * sending process. We also print out a bit of info related |
161 | * to the data itself; this assumes ipc_msg_hdr in dnssd_ipc.h |
162 | * of mDNSResponder stays the same. |
163 | */ |
164 | #define MDNSRESPONDER_PATH "/var/run/mDNSResponder" |
165 | |
166 | static int unpst_tracemdns; /* enable tracing */ |
167 | |
168 | #define MDNS_IPC_MSG_HDR_VERSION_1 1 |
169 | |
170 | struct mdns_ipc_msg_hdr { |
171 | uint32_t version; |
172 | uint32_t datalen; |
173 | uint32_t ipc_flags; |
174 | uint32_t op; |
175 | union { |
176 | void *context; |
177 | uint32_t u32[2]; |
178 | } __attribute__((packed)); |
179 | uint32_t reg_index; |
180 | } __attribute__((packed)); |
181 | |
182 | /* |
183 | * Unix communications domain. |
184 | * |
185 | * TODO: |
186 | * SEQPACKET, RDM |
187 | * rethink name space problems |
188 | * need a proper out-of-band |
189 | * lock pushdown |
190 | */ |
191 | static struct sockaddr sun_noname = { |
192 | .sa_len = sizeof(struct sockaddr), |
193 | .sa_family = AF_LOCAL, |
194 | .sa_data = { |
195 | 0, 0, 0, 0, 0, 0, 0, |
196 | 0, 0, 0, 0, 0, 0, 0 |
197 | } |
198 | }; |
199 | |
200 | static ino_t unp_ino; /* prototype for fake inode numbers */ |
201 | |
202 | static int unp_attach(struct socket *); |
203 | static void unp_detach(struct unpcb *); |
204 | static int unp_bind(struct unpcb *, struct sockaddr *, proc_t); |
205 | static int unp_connect(struct socket *, struct sockaddr *, proc_t); |
206 | static void unp_disconnect(struct unpcb *); |
207 | static void unp_shutdown(struct unpcb *); |
208 | static void unp_drop(struct unpcb *, int); |
209 | static void unp_gc(thread_call_param_t arg0, thread_call_param_t arg1); |
210 | static void unp_scan(struct mbuf *, void (*)(struct fileglob *, void *arg), void *arg); |
211 | static void unp_mark(struct fileglob *, __unused void *); |
212 | static void unp_discard(struct fileglob *, void *); |
213 | static int unp_internalize(struct mbuf *, proc_t); |
214 | static int unp_listen(struct unpcb *, proc_t); |
215 | static void unpcb_to_compat(struct unpcb *, struct unpcb_compat *); |
216 | static void unp_get_locks_in_order(struct socket *so, struct socket *conn_so); |
217 | |
218 | __startup_func |
219 | static void |
220 | unp_gc_setup(void) |
221 | { |
222 | unp_gc_tcall = thread_call_allocate_with_options(func: unp_gc, |
223 | NULL, pri: THREAD_CALL_PRIORITY_KERNEL, |
224 | options: THREAD_CALL_OPTIONS_ONCE); |
225 | } |
226 | STARTUP(THREAD_CALL, STARTUP_RANK_MIDDLE, unp_gc_setup); |
227 | |
228 | static void |
229 | unp_get_locks_in_order(struct socket *so, struct socket *conn_so) |
230 | { |
231 | if (so < conn_so) { |
232 | socket_lock(so: conn_so, refcount: 1); |
233 | } else { |
234 | struct unpcb *unp = sotounpcb(so); |
235 | unp->unp_flags |= UNP_DONTDISCONNECT; |
236 | unp->rw_thrcount++; |
237 | socket_unlock(so, refcount: 0); |
238 | |
239 | /* Get the locks in the correct order */ |
240 | socket_lock(so: conn_so, refcount: 1); |
241 | socket_lock(so, refcount: 0); |
242 | unp->rw_thrcount--; |
243 | if (unp->rw_thrcount == 0) { |
244 | unp->unp_flags &= ~UNP_DONTDISCONNECT; |
245 | wakeup(chan: unp); |
246 | } |
247 | } |
248 | } |
249 | |
250 | static int |
251 | uipc_abort(struct socket *so) |
252 | { |
253 | struct unpcb *unp = sotounpcb(so); |
254 | |
255 | if (unp == 0) { |
256 | return EINVAL; |
257 | } |
258 | unp_drop(unp, ECONNABORTED); |
259 | unp_detach(unp); |
260 | sofree(so); |
261 | return 0; |
262 | } |
263 | |
264 | static int |
265 | uipc_accept(struct socket *so, struct sockaddr **nam) |
266 | { |
267 | struct unpcb *unp = sotounpcb(so); |
268 | |
269 | if (unp == 0) { |
270 | return EINVAL; |
271 | } |
272 | |
273 | /* |
274 | * Pass back name of connected socket, |
275 | * if it was bound and we are still connected |
276 | * (our peer may have closed already!). |
277 | */ |
278 | if (unp->unp_conn != NULL && unp->unp_conn->unp_addr != NULL) { |
279 | *nam = dup_sockaddr(SA(unp->unp_conn->unp_addr), canwait: 1); |
280 | } else { |
281 | if (unp_log_enable_flags & ULEF_CONNECTION) { |
282 | os_log(OS_LOG_DEFAULT, "%s: peer disconnected unp_gencnt %llu" , |
283 | __func__, unp->unp_gencnt); |
284 | } |
285 | *nam = dup_sockaddr(SA(&sun_noname), canwait: 1); |
286 | } |
287 | return 0; |
288 | } |
289 | |
290 | /* |
291 | * Returns: 0 Success |
292 | * EISCONN |
293 | * unp_attach: |
294 | */ |
295 | static int |
296 | uipc_attach(struct socket *so, __unused int proto, __unused proc_t p) |
297 | { |
298 | struct unpcb *unp = sotounpcb(so); |
299 | |
300 | if (unp != 0) { |
301 | return EISCONN; |
302 | } |
303 | return unp_attach(so); |
304 | } |
305 | |
306 | static int |
307 | uipc_bind(struct socket *so, struct sockaddr *nam, proc_t p) |
308 | { |
309 | struct unpcb *unp = sotounpcb(so); |
310 | |
311 | if (unp == 0) { |
312 | return EINVAL; |
313 | } |
314 | |
315 | return unp_bind(unp, nam, p); |
316 | } |
317 | |
318 | /* |
319 | * Returns: 0 Success |
320 | * EINVAL |
321 | * unp_connect:??? [See elsewhere in this file] |
322 | */ |
323 | static int |
324 | uipc_connect(struct socket *so, struct sockaddr *nam, proc_t p) |
325 | { |
326 | struct unpcb *unp = sotounpcb(so); |
327 | |
328 | if (unp == 0) { |
329 | return EINVAL; |
330 | } |
331 | return unp_connect(so, nam, p); |
332 | } |
333 | |
334 | /* |
335 | * Returns: 0 Success |
336 | * EINVAL |
337 | * unp_connect2:EPROTOTYPE Protocol wrong type for socket |
338 | * unp_connect2:EINVAL Invalid argument |
339 | */ |
340 | static int |
341 | uipc_connect2(struct socket *so1, struct socket *so2) |
342 | { |
343 | struct unpcb *unp = sotounpcb(so1); |
344 | |
345 | if (unp == 0) { |
346 | return EINVAL; |
347 | } |
348 | |
349 | return unp_connect2(so: so1, so2); |
350 | } |
351 | |
352 | /* control is EOPNOTSUPP */ |
353 | |
354 | static int |
355 | uipc_detach(struct socket *so) |
356 | { |
357 | struct unpcb *unp = sotounpcb(so); |
358 | |
359 | if (unp == 0) { |
360 | return EINVAL; |
361 | } |
362 | |
363 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
364 | unp_detach(unp); |
365 | return 0; |
366 | } |
367 | |
368 | static int |
369 | uipc_disconnect(struct socket *so) |
370 | { |
371 | struct unpcb *unp = sotounpcb(so); |
372 | |
373 | if (unp == 0) { |
374 | return EINVAL; |
375 | } |
376 | unp_disconnect(unp); |
377 | return 0; |
378 | } |
379 | |
380 | /* |
381 | * Returns: 0 Success |
382 | * EINVAL |
383 | */ |
384 | static int |
385 | uipc_listen(struct socket *so, __unused proc_t p) |
386 | { |
387 | struct unpcb *unp = sotounpcb(so); |
388 | |
389 | if (unp == 0 || unp->unp_vnode == 0) { |
390 | return EINVAL; |
391 | } |
392 | return unp_listen(unp, p); |
393 | } |
394 | |
395 | static int |
396 | uipc_peeraddr(struct socket *so, struct sockaddr **nam) |
397 | { |
398 | struct unpcb *unp = sotounpcb(so); |
399 | struct socket *so2; |
400 | |
401 | if (unp == NULL) { |
402 | return EINVAL; |
403 | } |
404 | so2 = unp->unp_conn != NULL ? unp->unp_conn->unp_socket : NULL; |
405 | if (so2 != NULL) { |
406 | unp_get_locks_in_order(so, conn_so: so2); |
407 | } |
408 | |
409 | if (unp->unp_conn != NULL && unp->unp_conn->unp_addr != NULL) { |
410 | *nam = dup_sockaddr(SA(unp->unp_conn->unp_addr), canwait: 1); |
411 | } else { |
412 | *nam = dup_sockaddr(SA(&sun_noname), canwait: 1); |
413 | } |
414 | if (so2 != NULL) { |
415 | socket_unlock(so: so2, refcount: 1); |
416 | } |
417 | return 0; |
418 | } |
419 | |
420 | static int |
421 | uipc_rcvd(struct socket *so, __unused int flags) |
422 | { |
423 | struct unpcb *unp = sotounpcb(so); |
424 | struct socket *so2; |
425 | |
426 | if (unp == 0) { |
427 | return EINVAL; |
428 | } |
429 | switch (so->so_type) { |
430 | case SOCK_DGRAM: |
431 | panic("uipc_rcvd DGRAM?" ); |
432 | /*NOTREACHED*/ |
433 | |
434 | case SOCK_STREAM: |
435 | #define rcv (&so->so_rcv) |
436 | #define snd (&so2->so_snd) |
437 | if (unp->unp_conn == 0) { |
438 | break; |
439 | } |
440 | |
441 | so2 = unp->unp_conn->unp_socket; |
442 | unp_get_locks_in_order(so, conn_so: so2); |
443 | /* |
444 | * Adjust backpressure on sender |
445 | * and wakeup any waiting to write. |
446 | */ |
447 | snd->sb_mbmax += unp->unp_mbcnt - rcv->sb_mbcnt; |
448 | unp->unp_mbcnt = rcv->sb_mbcnt; |
449 | snd->sb_hiwat += unp->unp_cc - rcv->sb_cc; |
450 | unp->unp_cc = rcv->sb_cc; |
451 | if (sb_notify(sb: &so2->so_snd)) { |
452 | sowakeup(so: so2, sb: &so2->so_snd, so2: so); |
453 | } |
454 | |
455 | socket_unlock(so: so2, refcount: 1); |
456 | |
457 | #undef snd |
458 | #undef rcv |
459 | break; |
460 | |
461 | default: |
462 | panic("uipc_rcvd unknown socktype" ); |
463 | } |
464 | return 0; |
465 | } |
466 | |
467 | /* pru_rcvoob is EOPNOTSUPP */ |
468 | |
469 | /* |
470 | * Returns: 0 Success |
471 | * EINVAL |
472 | * EOPNOTSUPP |
473 | * EPIPE |
474 | * ENOTCONN |
475 | * EISCONN |
476 | * unp_internalize:EINVAL |
477 | * unp_internalize:EBADF |
478 | * unp_connect:EAFNOSUPPORT Address family not supported |
479 | * unp_connect:EINVAL Invalid argument |
480 | * unp_connect:ENOTSOCK Not a socket |
481 | * unp_connect:ECONNREFUSED Connection refused |
482 | * unp_connect:EISCONN Socket is connected |
483 | * unp_connect:EPROTOTYPE Protocol wrong type for socket |
484 | * unp_connect:??? |
485 | * sbappendaddr:ENOBUFS [5th argument, contents modified] |
486 | * sbappendaddr:??? [whatever a filter author chooses] |
487 | */ |
488 | static int |
489 | uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, |
490 | struct mbuf *control, proc_t p) |
491 | { |
492 | int error = 0; |
493 | struct unpcb *unp = sotounpcb(so); |
494 | struct socket *so2; |
495 | int32_t len = m_pktlen(m); |
496 | |
497 | if (unp == 0) { |
498 | error = EINVAL; |
499 | goto release; |
500 | } |
501 | if (flags & PRUS_OOB) { |
502 | error = EOPNOTSUPP; |
503 | goto release; |
504 | } |
505 | |
506 | if (control) { |
507 | /* release lock to avoid deadlock (4436174) */ |
508 | socket_unlock(so, refcount: 0); |
509 | error = unp_internalize(control, p); |
510 | socket_lock(so, refcount: 0); |
511 | if (error) { |
512 | goto release; |
513 | } |
514 | } |
515 | |
516 | switch (so->so_type) { |
517 | case SOCK_DGRAM: |
518 | { |
519 | struct sockaddr *from; |
520 | |
521 | if (nam) { |
522 | if (unp->unp_conn) { |
523 | error = EISCONN; |
524 | break; |
525 | } |
526 | error = unp_connect(so, nam, p); |
527 | if (error) { |
528 | so->so_state &= ~SS_ISCONNECTING; |
529 | break; |
530 | } |
531 | } else { |
532 | if (unp->unp_conn == 0) { |
533 | error = ENOTCONN; |
534 | break; |
535 | } |
536 | } |
537 | |
538 | so2 = unp->unp_conn->unp_socket; |
539 | if (so != so2) { |
540 | unp_get_locks_in_order(so, conn_so: so2); |
541 | } |
542 | |
543 | if (unp->unp_addr) { |
544 | from = SA(unp->unp_addr); |
545 | } else { |
546 | from = &sun_noname; |
547 | } |
548 | /* |
549 | * sbappendaddr() will fail when the receiver runs out of |
550 | * space; in contrast to SOCK_STREAM, we will lose messages |
551 | * for the SOCK_DGRAM case when the receiver's queue overflows. |
552 | * SB_UNIX on the socket buffer implies that the callee will |
553 | * not free the control message, if any, because we would need |
554 | * to call unp_dispose() on it. |
555 | */ |
556 | if (sbappendaddr(sb: &so2->so_rcv, asa: from, m0: m, control, error_out: &error)) { |
557 | control = NULL; |
558 | if (sb_notify(sb: &so2->so_rcv)) { |
559 | sowakeup(so: so2, sb: &so2->so_rcv, so2: so); |
560 | } |
561 | so2->so_tc_stats[0].rxpackets += 1; |
562 | so2->so_tc_stats[0].rxbytes += len; |
563 | } else if (control != NULL && error == 0) { |
564 | /* A socket filter took control; don't touch it */ |
565 | control = NULL; |
566 | } |
567 | |
568 | if (so != so2) { |
569 | socket_unlock(so: so2, refcount: 1); |
570 | } |
571 | |
572 | m = NULL; |
573 | if (nam) { |
574 | unp_disconnect(unp); |
575 | } |
576 | break; |
577 | } |
578 | |
579 | case SOCK_STREAM: { |
580 | int didreceive = 0; |
581 | #define rcv (&so2->so_rcv) |
582 | #define snd (&so->so_snd) |
583 | /* Connect if not connected yet. */ |
584 | /* |
585 | * Note: A better implementation would complain |
586 | * if not equal to the peer's address. |
587 | */ |
588 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
589 | if (nam) { |
590 | error = unp_connect(so, nam, p); |
591 | if (error) { |
592 | so->so_state &= ~SS_ISCONNECTING; |
593 | break; /* XXX */ |
594 | } |
595 | } else { |
596 | error = ENOTCONN; |
597 | break; |
598 | } |
599 | } |
600 | |
601 | if (so->so_state & SS_CANTSENDMORE) { |
602 | error = EPIPE; |
603 | break; |
604 | } |
605 | if (unp->unp_conn == 0) { |
606 | panic("uipc_send connected but no connection? " |
607 | "socket state: %x socket flags: %x socket flags1: %x." , |
608 | so->so_state, so->so_flags, so->so_flags1); |
609 | } |
610 | |
611 | so2 = unp->unp_conn->unp_socket; |
612 | unp_get_locks_in_order(so, conn_so: so2); |
613 | |
614 | /* Check socket state again as we might have unlocked the socket |
615 | * while trying to get the locks in order |
616 | */ |
617 | |
618 | if ((so->so_state & SS_CANTSENDMORE)) { |
619 | error = EPIPE; |
620 | socket_unlock(so: so2, refcount: 1); |
621 | break; |
622 | } |
623 | |
624 | if (unp->unp_flags & UNP_TRACE_MDNS) { |
625 | struct mdns_ipc_msg_hdr hdr; |
626 | |
627 | if (mbuf_copydata(mbuf: m, offset: 0, length: sizeof(hdr), out_data: &hdr) == 0 && |
628 | hdr.version == ntohl(MDNS_IPC_MSG_HDR_VERSION_1)) { |
629 | os_log(OS_LOG_DEFAULT, |
630 | "%s[mDNSResponder] pid=%d (%s): op=0x%x" , |
631 | __func__, proc_getpid(p), p->p_comm, ntohl(hdr.op)); |
632 | } |
633 | } |
634 | |
635 | /* |
636 | * Send to paired receive port, and then reduce send buffer |
637 | * hiwater marks to maintain backpressure. Wake up readers. |
638 | * SB_UNIX flag will allow new record to be appended to the |
639 | * receiver's queue even when it is already full. It is |
640 | * possible, however, that append might fail. In that case, |
641 | * we will need to call unp_dispose() on the control message; |
642 | * the callee will not free it since SB_UNIX is set. |
643 | */ |
644 | didreceive = control ? |
645 | sbappendcontrol(rcv, m0: m, control, error_out: &error) : sbappend(rcv, m); |
646 | |
647 | snd->sb_mbmax -= rcv->sb_mbcnt - unp->unp_conn->unp_mbcnt; |
648 | unp->unp_conn->unp_mbcnt = rcv->sb_mbcnt; |
649 | if ((int32_t)snd->sb_hiwat >= |
650 | (int32_t)(rcv->sb_cc - unp->unp_conn->unp_cc)) { |
651 | snd->sb_hiwat -= rcv->sb_cc - unp->unp_conn->unp_cc; |
652 | } else { |
653 | snd->sb_hiwat = 0; |
654 | } |
655 | unp->unp_conn->unp_cc = rcv->sb_cc; |
656 | if (didreceive) { |
657 | control = NULL; |
658 | if (sb_notify(sb: &so2->so_rcv)) { |
659 | sowakeup(so: so2, sb: &so2->so_rcv, so2: so); |
660 | } |
661 | so2->so_tc_stats[0].rxpackets += 1; |
662 | so2->so_tc_stats[0].rxbytes += len; |
663 | } else if (control != NULL && error == 0) { |
664 | /* A socket filter took control; don't touch it */ |
665 | control = NULL; |
666 | } |
667 | |
668 | socket_unlock(so: so2, refcount: 1); |
669 | m = NULL; |
670 | #undef snd |
671 | #undef rcv |
672 | } |
673 | break; |
674 | |
675 | default: |
676 | panic("uipc_send unknown socktype" ); |
677 | } |
678 | |
679 | so->so_tc_stats[0].txpackets += 1; |
680 | so->so_tc_stats[0].txbytes += len; |
681 | |
682 | /* |
683 | * SEND_EOF is equivalent to a SEND followed by |
684 | * a SHUTDOWN. |
685 | */ |
686 | if (flags & PRUS_EOF) { |
687 | socantsendmore(so); |
688 | unp_shutdown(unp); |
689 | } |
690 | |
691 | if (control && error != 0) { |
692 | socket_unlock(so, refcount: 0); |
693 | unp_dispose(m: control); |
694 | socket_lock(so, refcount: 0); |
695 | } |
696 | |
697 | release: |
698 | if (control) { |
699 | m_freem(control); |
700 | } |
701 | if (m) { |
702 | m_freem(m); |
703 | } |
704 | return error; |
705 | } |
706 | |
707 | static int |
708 | uipc_sense(struct socket *so, void *ub, int isstat64) |
709 | { |
710 | struct unpcb *unp = sotounpcb(so); |
711 | struct socket *so2; |
712 | blksize_t blksize; |
713 | |
714 | if (unp == 0) { |
715 | return EINVAL; |
716 | } |
717 | |
718 | blksize = so->so_snd.sb_hiwat; |
719 | if (so->so_type == SOCK_STREAM && unp->unp_conn != 0) { |
720 | so2 = unp->unp_conn->unp_socket; |
721 | blksize += so2->so_rcv.sb_cc; |
722 | } |
723 | if (unp->unp_ino == 0) { |
724 | unp->unp_ino = unp_ino++; |
725 | } |
726 | |
727 | if (isstat64 != 0) { |
728 | struct stat64 *sb64; |
729 | |
730 | sb64 = (struct stat64 *)ub; |
731 | sb64->st_blksize = blksize; |
732 | sb64->st_dev = NODEV; |
733 | sb64->st_ino = (ino64_t)unp->unp_ino; |
734 | } else { |
735 | struct stat *sb; |
736 | |
737 | sb = (struct stat *)ub; |
738 | sb->st_blksize = blksize; |
739 | sb->st_dev = NODEV; |
740 | sb->st_ino = (ino_t)(uintptr_t)unp->unp_ino; |
741 | } |
742 | |
743 | return 0; |
744 | } |
745 | |
746 | /* |
747 | * Returns: 0 Success |
748 | * EINVAL |
749 | * |
750 | * Notes: This is not strictly correct, as unp_shutdown() also calls |
751 | * socantrcvmore(). These should maybe both be conditionalized |
752 | * on the 'how' argument in soshutdown() as called from the |
753 | * shutdown() system call. |
754 | */ |
755 | static int |
756 | uipc_shutdown(struct socket *so) |
757 | { |
758 | struct unpcb *unp = sotounpcb(so); |
759 | |
760 | if (unp == 0) { |
761 | return EINVAL; |
762 | } |
763 | socantsendmore(so); |
764 | unp_shutdown(unp); |
765 | return 0; |
766 | } |
767 | |
768 | /* |
769 | * Returns: 0 Success |
770 | * EINVAL Invalid argument |
771 | */ |
772 | static int |
773 | uipc_sockaddr(struct socket *so, struct sockaddr **nam) |
774 | { |
775 | struct unpcb *unp = sotounpcb(so); |
776 | |
777 | if (unp == NULL) { |
778 | return EINVAL; |
779 | } |
780 | if (unp->unp_addr != NULL) { |
781 | *nam = dup_sockaddr(SA(unp->unp_addr), canwait: 1); |
782 | } else { |
783 | *nam = dup_sockaddr(SA(&sun_noname), canwait: 1); |
784 | } |
785 | return 0; |
786 | } |
787 | |
788 | struct pr_usrreqs uipc_usrreqs = { |
789 | .pru_abort = uipc_abort, |
790 | .pru_accept = uipc_accept, |
791 | .pru_attach = uipc_attach, |
792 | .pru_bind = uipc_bind, |
793 | .pru_connect = uipc_connect, |
794 | .pru_connect2 = uipc_connect2, |
795 | .pru_detach = uipc_detach, |
796 | .pru_disconnect = uipc_disconnect, |
797 | .pru_listen = uipc_listen, |
798 | .pru_peeraddr = uipc_peeraddr, |
799 | .pru_rcvd = uipc_rcvd, |
800 | .pru_send = uipc_send, |
801 | .pru_sense = uipc_sense, |
802 | .pru_shutdown = uipc_shutdown, |
803 | .pru_sockaddr = uipc_sockaddr, |
804 | .pru_sosend = sosend, |
805 | .pru_soreceive = soreceive, |
806 | }; |
807 | |
808 | int |
809 | uipc_ctloutput(struct socket *so, struct sockopt *sopt) |
810 | { |
811 | struct unpcb *unp = sotounpcb(so); |
812 | int error = 0; |
813 | pid_t peerpid; |
814 | proc_t p; |
815 | task_t t __single; |
816 | struct socket *peerso; |
817 | |
818 | switch (sopt->sopt_dir) { |
819 | case SOPT_GET: |
820 | switch (sopt->sopt_name) { |
821 | case LOCAL_PEERCRED: |
822 | if (unp->unp_flags & UNP_HAVEPC) { |
823 | error = sooptcopyout(sopt, data: &unp->unp_peercred, |
824 | len: sizeof(unp->unp_peercred)); |
825 | } else { |
826 | if (so->so_type == SOCK_STREAM) { |
827 | error = ENOTCONN; |
828 | } else { |
829 | error = EINVAL; |
830 | } |
831 | } |
832 | break; |
833 | case LOCAL_PEERPID: |
834 | case LOCAL_PEEREPID: |
835 | if (unp->unp_conn == NULL) { |
836 | error = ENOTCONN; |
837 | break; |
838 | } |
839 | peerso = unp->unp_conn->unp_socket; |
840 | if (peerso == NULL) { |
841 | panic("peer is connected but has no socket?" ); |
842 | } |
843 | unp_get_locks_in_order(so, conn_so: peerso); |
844 | if (sopt->sopt_name == LOCAL_PEEREPID && |
845 | peerso->so_flags & SOF_DELEGATED) { |
846 | peerpid = peerso->e_pid; |
847 | } else { |
848 | peerpid = peerso->last_pid; |
849 | } |
850 | socket_unlock(so: peerso, refcount: 1); |
851 | error = sooptcopyout(sopt, data: &peerpid, len: sizeof(peerpid)); |
852 | break; |
853 | case LOCAL_PEERUUID: |
854 | case LOCAL_PEEREUUID: |
855 | if (unp->unp_conn == NULL) { |
856 | error = ENOTCONN; |
857 | break; |
858 | } |
859 | peerso = unp->unp_conn->unp_socket; |
860 | if (peerso == NULL) { |
861 | panic("peer is connected but has no socket?" ); |
862 | } |
863 | unp_get_locks_in_order(so, conn_so: peerso); |
864 | if (sopt->sopt_name == LOCAL_PEEREUUID && |
865 | peerso->so_flags & SOF_DELEGATED) { |
866 | error = sooptcopyout(sopt, data: &peerso->e_uuid, |
867 | len: sizeof(peerso->e_uuid)); |
868 | } else { |
869 | error = sooptcopyout(sopt, data: &peerso->last_uuid, |
870 | len: sizeof(peerso->last_uuid)); |
871 | } |
872 | socket_unlock(so: peerso, refcount: 1); |
873 | break; |
874 | case LOCAL_PEERTOKEN: |
875 | if (unp->unp_conn == NULL) { |
876 | error = ENOTCONN; |
877 | break; |
878 | } |
879 | peerso = unp->unp_conn->unp_socket; |
880 | if (peerso == NULL) { |
881 | panic("peer is connected but has no socket?" ); |
882 | } |
883 | unp_get_locks_in_order(so, conn_so: peerso); |
884 | peerpid = peerso->last_pid; |
885 | p = proc_find(pid: peerpid); |
886 | if (p != PROC_NULL) { |
887 | t = proc_task(p); |
888 | if (t != TASK_NULL) { |
889 | audit_token_t peertoken; |
890 | mach_msg_type_number_t count = TASK_AUDIT_TOKEN_COUNT; |
891 | if (task_info(task: t, TASK_AUDIT_TOKEN, task_info_out: (task_info_t)&peertoken, task_info_count: &count) == KERN_SUCCESS) { |
892 | error = sooptcopyout(sopt, data: &peertoken, len: sizeof(peertoken)); |
893 | } else { |
894 | error = EINVAL; |
895 | } |
896 | } else { |
897 | error = EINVAL; |
898 | } |
899 | proc_rele(p); |
900 | } else { |
901 | error = EINVAL; |
902 | } |
903 | socket_unlock(so: peerso, refcount: 1); |
904 | break; |
905 | default: |
906 | error = EOPNOTSUPP; |
907 | break; |
908 | } |
909 | break; |
910 | case SOPT_SET: |
911 | default: |
912 | error = EOPNOTSUPP; |
913 | break; |
914 | } |
915 | |
916 | return error; |
917 | } |
918 | |
919 | /* |
920 | * Both send and receive buffers are allocated PIPSIZ bytes of buffering |
921 | * for stream sockets, although the total for sender and receiver is |
922 | * actually only PIPSIZ. |
923 | * Datagram sockets really use the sendspace as the maximum datagram size, |
924 | * and don't really want to reserve the sendspace. Their recvspace should |
925 | * be large enough for at least one max-size datagram plus address. |
926 | */ |
927 | #ifndef PIPSIZ |
928 | #define PIPSIZ 8192 |
929 | #endif |
930 | static u_int32_t unpst_sendspace = PIPSIZ; |
931 | static u_int32_t unpst_recvspace = PIPSIZ; |
932 | static u_int32_t unpdg_sendspace = 2 * 1024; /* really max datagram size */ |
933 | static u_int32_t unpdg_recvspace = 4 * 1024; |
934 | |
935 | SYSCTL_DECL(_net_local_stream); |
936 | SYSCTL_INT(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW | CTLFLAG_LOCKED, |
937 | &unpst_sendspace, 0, "" ); |
938 | SYSCTL_INT(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW | CTLFLAG_LOCKED, |
939 | &unpst_recvspace, 0, "" ); |
940 | SYSCTL_INT(_net_local_stream, OID_AUTO, tracemdns, CTLFLAG_RW | CTLFLAG_LOCKED, |
941 | &unpst_tracemdns, 0, "" ); |
942 | SYSCTL_DECL(_net_local_dgram); |
943 | SYSCTL_INT(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW | CTLFLAG_LOCKED, |
944 | &unpdg_sendspace, 0, "" ); |
945 | SYSCTL_INT(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW | CTLFLAG_LOCKED, |
946 | &unpdg_recvspace, 0, "" ); |
947 | |
948 | /* |
949 | * Returns: 0 Success |
950 | * ENOBUFS |
951 | * soreserve:ENOBUFS |
952 | */ |
953 | static int |
954 | unp_attach(struct socket *so) |
955 | { |
956 | struct unpcb *unp; |
957 | int error = 0; |
958 | |
959 | if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { |
960 | switch (so->so_type) { |
961 | case SOCK_STREAM: |
962 | error = soreserve(so, sndcc: unpst_sendspace, rcvcc: unpst_recvspace); |
963 | break; |
964 | |
965 | case SOCK_DGRAM: |
966 | /* |
967 | * By default soreserve() will set the low water |
968 | * mark to MCLBYTES which is too high given our |
969 | * default sendspace. Override it here to something |
970 | * sensible. |
971 | */ |
972 | so->so_snd.sb_lowat = 1; |
973 | error = soreserve(so, sndcc: unpdg_sendspace, rcvcc: unpdg_recvspace); |
974 | break; |
975 | |
976 | default: |
977 | panic("unp_attach" ); |
978 | } |
979 | if (error) { |
980 | return error; |
981 | } |
982 | } |
983 | unp = zalloc_flags(unp_zone, Z_WAITOK | Z_ZERO | Z_NOFAIL); |
984 | |
985 | lck_mtx_init(lck: &unp->unp_mtx, grp: &unp_mtx_grp, attr: &unp_mtx_attr); |
986 | |
987 | lck_rw_lock_exclusive(lck: &unp_list_mtx); |
988 | LIST_INIT(&unp->unp_refs); |
989 | unp->unp_socket = so; |
990 | unp->unp_gencnt = ++unp_gencnt; |
991 | unp_count++; |
992 | LIST_INSERT_HEAD(so->so_type == SOCK_DGRAM ? |
993 | &unp_dhead : &unp_shead, unp, unp_link); |
994 | lck_rw_done(lck: &unp_list_mtx); |
995 | so->so_pcb = (caddr_t)unp; |
996 | /* |
997 | * Mark AF_UNIX socket buffers accordingly so that: |
998 | * |
999 | * a. In the SOCK_STREAM case, socket buffer append won't fail due to |
1000 | * the lack of space; this essentially loosens the sbspace() check, |
1001 | * since there is disconnect between sosend() and uipc_send() with |
1002 | * respect to flow control that might result in our dropping the |
1003 | * data in uipc_send(). By setting this, we allow for slightly |
1004 | * more records to be appended to the receiving socket to avoid |
1005 | * losing data (which we can't afford in the SOCK_STREAM case). |
1006 | * Flow control still takes place since we adjust the sender's |
1007 | * hiwat during each send. This doesn't affect the SOCK_DGRAM |
1008 | * case and append would still fail when the queue overflows. |
1009 | * |
1010 | * b. In the presence of control messages containing internalized |
1011 | * file descriptors, the append routines will not free them since |
1012 | * we'd need to undo the work first via unp_dispose(). |
1013 | */ |
1014 | so->so_rcv.sb_flags |= SB_UNIX; |
1015 | so->so_snd.sb_flags |= SB_UNIX; |
1016 | return 0; |
1017 | } |
1018 | |
1019 | static void |
1020 | unp_detach(struct unpcb *unp) |
1021 | { |
1022 | int so_locked = 1; |
1023 | |
1024 | lck_rw_lock_exclusive(lck: &unp_list_mtx); |
1025 | LIST_REMOVE(unp, unp_link); |
1026 | --unp_count; |
1027 | ++unp_gencnt; |
1028 | lck_rw_done(lck: &unp_list_mtx); |
1029 | if (unp->unp_vnode) { |
1030 | struct vnode *tvp = NULL; |
1031 | socket_unlock(so: unp->unp_socket, refcount: 0); |
1032 | |
1033 | /* Holding unp_connect_lock will avoid a race between |
1034 | * a thread closing the listening socket and a thread |
1035 | * connecting to it. |
1036 | */ |
1037 | lck_mtx_lock(lck: &unp_connect_lock); |
1038 | socket_lock(so: unp->unp_socket, refcount: 0); |
1039 | if (unp->unp_vnode) { |
1040 | tvp = unp->unp_vnode; |
1041 | unp->unp_vnode->v_socket = NULL; |
1042 | unp->unp_vnode = NULL; |
1043 | } |
1044 | lck_mtx_unlock(lck: &unp_connect_lock); |
1045 | if (tvp != NULL) { |
1046 | vnode_rele(vp: tvp); /* drop the usecount */ |
1047 | } |
1048 | } |
1049 | if (unp->unp_conn) { |
1050 | unp_disconnect(unp); |
1051 | } |
1052 | while (unp->unp_refs.lh_first) { |
1053 | struct unpcb *unp2 = NULL; |
1054 | |
1055 | /* This datagram socket is connected to one or more |
1056 | * sockets. In order to avoid a race condition between removing |
1057 | * this reference and closing the connected socket, we need |
1058 | * to check disconnect_in_progress |
1059 | */ |
1060 | if (so_locked == 1) { |
1061 | socket_unlock(so: unp->unp_socket, refcount: 0); |
1062 | so_locked = 0; |
1063 | } |
1064 | lck_mtx_lock(lck: &unp_disconnect_lock); |
1065 | while (disconnect_in_progress != 0) { |
1066 | (void)msleep(chan: (caddr_t)&disconnect_in_progress, mtx: &unp_disconnect_lock, |
1067 | PSOCK, wmesg: "disconnect" , NULL); |
1068 | } |
1069 | disconnect_in_progress = 1; |
1070 | lck_mtx_unlock(lck: &unp_disconnect_lock); |
1071 | |
1072 | /* Now we are sure that any unpcb socket disconnect is not happening */ |
1073 | if (unp->unp_refs.lh_first != NULL) { |
1074 | unp2 = unp->unp_refs.lh_first; |
1075 | socket_lock(so: unp2->unp_socket, refcount: 1); |
1076 | } |
1077 | |
1078 | lck_mtx_lock(lck: &unp_disconnect_lock); |
1079 | disconnect_in_progress = 0; |
1080 | wakeup(chan: &disconnect_in_progress); |
1081 | lck_mtx_unlock(lck: &unp_disconnect_lock); |
1082 | |
1083 | if (unp2 != NULL) { |
1084 | /* We already locked this socket and have a reference on it */ |
1085 | unp_drop(unp2, ECONNRESET); |
1086 | socket_unlock(so: unp2->unp_socket, refcount: 1); |
1087 | } |
1088 | } |
1089 | |
1090 | if (so_locked == 0) { |
1091 | socket_lock(so: unp->unp_socket, refcount: 0); |
1092 | so_locked = 1; |
1093 | } |
1094 | soisdisconnected(so: unp->unp_socket); |
1095 | /* makes sure we're getting dealloced */ |
1096 | unp->unp_socket->so_flags |= SOF_PCBCLEARING; |
1097 | } |
1098 | |
1099 | /* |
1100 | * Returns: 0 Success |
1101 | * EAFNOSUPPORT |
1102 | * EINVAL |
1103 | * EADDRINUSE |
1104 | * namei:??? [anything namei can return] |
1105 | * vnode_authorize:??? [anything vnode_authorize can return] |
1106 | * |
1107 | * Notes: p at this point is the current process, as this function is |
1108 | * only called by sobind(). |
1109 | */ |
1110 | static int |
1111 | unp_bind( |
1112 | struct unpcb *unp, |
1113 | struct sockaddr *nam, |
1114 | proc_t p) |
1115 | { |
1116 | struct sockaddr_un *soun = SUN(nam); |
1117 | struct vnode *vp __single, *dvp; |
1118 | struct vnode_attr va; |
1119 | vfs_context_t ctx = vfs_context_current(); |
1120 | int error, namelen; |
1121 | struct nameidata nd; |
1122 | struct socket *so = unp->unp_socket; |
1123 | char buf[SOCK_MAXADDRLEN]; |
1124 | |
1125 | if (nam->sa_family != 0 && nam->sa_family != AF_UNIX) { |
1126 | return EAFNOSUPPORT; |
1127 | } |
1128 | |
1129 | /* |
1130 | * Check if the socket is already bound to an address |
1131 | */ |
1132 | if (unp->unp_vnode != NULL) { |
1133 | return EINVAL; |
1134 | } |
1135 | /* |
1136 | * Check if the socket may have been shut down |
1137 | */ |
1138 | if ((so->so_state & (SS_CANTRCVMORE | SS_CANTSENDMORE)) == |
1139 | (SS_CANTRCVMORE | SS_CANTSENDMORE)) { |
1140 | return EINVAL; |
1141 | } |
1142 | |
1143 | namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path); |
1144 | if (namelen <= 0) { |
1145 | return EINVAL; |
1146 | } |
1147 | /* |
1148 | * Note: sun_path is not a zero terminated "C" string |
1149 | */ |
1150 | if (namelen >= SOCK_MAXADDRLEN) { |
1151 | return EINVAL; |
1152 | } |
1153 | bcopy(src: soun->sun_path, dst: buf, n: namelen); |
1154 | buf[namelen] = 0; |
1155 | |
1156 | socket_unlock(so, refcount: 0); |
1157 | |
1158 | NDINIT(&nd, CREATE, OP_MKFIFO, FOLLOW | LOCKPARENT, UIO_SYSSPACE, |
1159 | CAST_USER_ADDR_T(buf), ctx); |
1160 | /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */ |
1161 | error = namei(ndp: &nd); |
1162 | if (error) { |
1163 | socket_lock(so, refcount: 0); |
1164 | return error; |
1165 | } |
1166 | dvp = nd.ni_dvp; |
1167 | vp = nd.ni_vp; |
1168 | |
1169 | if (vp != NULL) { |
1170 | /* |
1171 | * need to do this before the vnode_put of dvp |
1172 | * since we may have to release an fs_nodelock |
1173 | */ |
1174 | nameidone(&nd); |
1175 | |
1176 | vnode_put(vp: dvp); |
1177 | vnode_put(vp); |
1178 | |
1179 | socket_lock(so, refcount: 0); |
1180 | return EADDRINUSE; |
1181 | } |
1182 | |
1183 | VATTR_INIT(&va); |
1184 | VATTR_SET(&va, va_type, VSOCK); |
1185 | VATTR_SET(&va, va_mode, (ACCESSPERMS & ~p->p_fd.fd_cmask)); |
1186 | |
1187 | #if CONFIG_MACF |
1188 | error = mac_vnode_check_create(ctx, |
1189 | dvp: nd.ni_dvp, cnp: &nd.ni_cnd, vap: &va); |
1190 | |
1191 | if (error == 0) |
1192 | #endif /* CONFIG_MACF */ |
1193 | #if CONFIG_MACF_SOCKET_SUBSET |
1194 | error = mac_vnode_check_uipc_bind(ctx, |
1195 | dvp: nd.ni_dvp, cnp: &nd.ni_cnd, vap: &va); |
1196 | |
1197 | if (error == 0) |
1198 | #endif /* MAC_SOCKET_SUBSET */ |
1199 | /* authorize before creating */ |
1200 | error = vnode_authorize(vp: dvp, NULL, KAUTH_VNODE_ADD_FILE, ctx); |
1201 | |
1202 | if (!error) { |
1203 | /* create the socket */ |
1204 | error = vn_create(dvp, &vp, &nd, &va, 0, 0, NULL, ctx); |
1205 | } |
1206 | |
1207 | nameidone(&nd); |
1208 | vnode_put(vp: dvp); |
1209 | |
1210 | if (error) { |
1211 | socket_lock(so, refcount: 0); |
1212 | return error; |
1213 | } |
1214 | |
1215 | socket_lock(so, refcount: 0); |
1216 | |
1217 | if (unp->unp_vnode != NULL) { |
1218 | vnode_put(vp); /* drop the iocount */ |
1219 | return EINVAL; |
1220 | } |
1221 | |
1222 | error = vnode_ref(vp); /* gain a longterm reference */ |
1223 | if (error) { |
1224 | vnode_put(vp); /* drop the iocount */ |
1225 | return error; |
1226 | } |
1227 | |
1228 | vp->v_socket = unp->unp_socket; |
1229 | unp->unp_vnode = vp; |
1230 | unp->unp_addr = SUN(dup_sockaddr(nam, 1)); |
1231 | vnode_put(vp); /* drop the iocount */ |
1232 | |
1233 | return 0; |
1234 | } |
1235 | |
1236 | |
1237 | /* |
1238 | * Returns: 0 Success |
1239 | * EAFNOSUPPORT Address family not supported |
1240 | * EINVAL Invalid argument |
1241 | * ENOTSOCK Not a socket |
1242 | * ECONNREFUSED Connection refused |
1243 | * EPROTOTYPE Protocol wrong type for socket |
1244 | * EISCONN Socket is connected |
1245 | * unp_connect2:EPROTOTYPE Protocol wrong type for socket |
1246 | * unp_connect2:EINVAL Invalid argument |
1247 | * namei:??? [anything namei can return] |
1248 | * vnode_authorize:???? [anything vnode_authorize can return] |
1249 | * |
1250 | * Notes: p at this point is the current process, as this function is |
1251 | * only called by sosend(), sendfile(), and soconnectlock(). |
1252 | */ |
1253 | static int |
1254 | unp_connect(struct socket *so, struct sockaddr *nam, __unused proc_t p) |
1255 | { |
1256 | struct sockaddr_un *soun = SUN(nam); |
1257 | struct vnode *vp; |
1258 | struct socket *so2, *so3, *list_so = NULL; |
1259 | struct unpcb *unp, *unp2, *unp3; |
1260 | vfs_context_t ctx = vfs_context_current(); |
1261 | int error, len; |
1262 | struct nameidata nd; |
1263 | char buf[SOCK_MAXADDRLEN]; |
1264 | |
1265 | if (nam->sa_family != 0 && nam->sa_family != AF_UNIX) { |
1266 | return EAFNOSUPPORT; |
1267 | } |
1268 | |
1269 | unp = sotounpcb(so); |
1270 | so2 = so3 = NULL; |
1271 | |
1272 | len = nam->sa_len - offsetof(struct sockaddr_un, sun_path); |
1273 | if (len <= 0) { |
1274 | return EINVAL; |
1275 | } |
1276 | /* |
1277 | * Note: sun_path is not a zero terminated "C" string |
1278 | */ |
1279 | if (len >= SOCK_MAXADDRLEN) { |
1280 | return EINVAL; |
1281 | } |
1282 | |
1283 | soisconnecting(so); |
1284 | |
1285 | bcopy(src: soun->sun_path, dst: buf, n: len); |
1286 | buf[len] = 0; |
1287 | |
1288 | socket_unlock(so, refcount: 0); |
1289 | |
1290 | NDINIT(&nd, LOOKUP, OP_LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, |
1291 | CAST_USER_ADDR_T(buf), ctx); |
1292 | error = namei(ndp: &nd); |
1293 | if (error) { |
1294 | socket_lock(so, refcount: 0); |
1295 | return error; |
1296 | } |
1297 | nameidone(&nd); |
1298 | vp = nd.ni_vp; |
1299 | if (vp->v_type != VSOCK) { |
1300 | error = ENOTSOCK; |
1301 | socket_lock(so, refcount: 0); |
1302 | goto out; |
1303 | } |
1304 | |
1305 | #if CONFIG_MACF_SOCKET_SUBSET |
1306 | error = mac_vnode_check_uipc_connect(ctx, vp, so); |
1307 | if (error) { |
1308 | socket_lock(so, refcount: 0); |
1309 | goto out; |
1310 | } |
1311 | #endif /* MAC_SOCKET_SUBSET */ |
1312 | |
1313 | error = vnode_authorize(vp, NULL, KAUTH_VNODE_WRITE_DATA, ctx); |
1314 | if (error) { |
1315 | socket_lock(so, refcount: 0); |
1316 | goto out; |
1317 | } |
1318 | |
1319 | lck_mtx_lock(lck: &unp_connect_lock); |
1320 | |
1321 | if (vp->v_socket == 0) { |
1322 | lck_mtx_unlock(lck: &unp_connect_lock); |
1323 | error = ECONNREFUSED; |
1324 | socket_lock(so, refcount: 0); |
1325 | goto out; |
1326 | } |
1327 | |
1328 | socket_lock(so: vp->v_socket, refcount: 1); /* Get a reference on the listening socket */ |
1329 | so2 = vp->v_socket; |
1330 | lck_mtx_unlock(lck: &unp_connect_lock); |
1331 | |
1332 | |
1333 | if (so2->so_pcb == NULL) { |
1334 | error = ECONNREFUSED; |
1335 | if (so != so2) { |
1336 | socket_unlock(so: so2, refcount: 1); |
1337 | socket_lock(so, refcount: 0); |
1338 | } else { |
1339 | /* Release the reference held for the listen socket */ |
1340 | VERIFY(so2->so_usecount > 0); |
1341 | so2->so_usecount--; |
1342 | } |
1343 | goto out; |
1344 | } |
1345 | |
1346 | if (so < so2) { |
1347 | socket_unlock(so: so2, refcount: 0); |
1348 | socket_lock(so, refcount: 0); |
1349 | socket_lock(so: so2, refcount: 0); |
1350 | } else if (so > so2) { |
1351 | socket_lock(so, refcount: 0); |
1352 | } |
1353 | /* |
1354 | * Check if socket was connected while we were trying to |
1355 | * get the socket locks in order. |
1356 | * XXX - probably shouldn't return an error for SOCK_DGRAM |
1357 | */ |
1358 | if ((so->so_state & SS_ISCONNECTED) != 0) { |
1359 | error = EISCONN; |
1360 | goto decref_out; |
1361 | } |
1362 | |
1363 | if (so->so_type != so2->so_type) { |
1364 | error = EPROTOTYPE; |
1365 | goto decref_out; |
1366 | } |
1367 | |
1368 | if (so->so_proto->pr_flags & PR_CONNREQUIRED) { |
1369 | /* Release the incoming socket but keep a reference */ |
1370 | socket_unlock(so, refcount: 0); |
1371 | |
1372 | if ((so2->so_options & SO_ACCEPTCONN) == 0 || |
1373 | (so3 = sonewconn(head: so2, connstatus: 0, from: nam)) == 0) { |
1374 | error = ECONNREFUSED; |
1375 | if (so != so2) { |
1376 | socket_unlock(so: so2, refcount: 1); |
1377 | socket_lock(so, refcount: 0); |
1378 | } else { |
1379 | socket_lock(so, refcount: 0); |
1380 | /* Release the reference held for |
1381 | * listen socket. |
1382 | */ |
1383 | VERIFY(so2->so_usecount > 0); |
1384 | so2->so_usecount--; |
1385 | } |
1386 | goto out; |
1387 | } |
1388 | unp2 = sotounpcb(so2); |
1389 | unp3 = sotounpcb(so3); |
1390 | if (unp2->unp_addr) { |
1391 | unp3->unp_addr = SUN(dup_sockaddr((struct sockaddr *)unp2->unp_addr, 1)); |
1392 | } |
1393 | |
1394 | /* |
1395 | * unp_peercred management: |
1396 | * |
1397 | * The connecter's (client's) credentials are copied |
1398 | * from its process structure at the time of connect() |
1399 | * (which is now). |
1400 | */ |
1401 | cru2x(cr: vfs_context_ucred(ctx), xcr: &unp3->unp_peercred); |
1402 | unp3->unp_flags |= UNP_HAVEPC; |
1403 | /* |
1404 | * The receiver's (server's) credentials are copied |
1405 | * from the unp_peercred member of socket on which the |
1406 | * former called listen(); unp_listen() cached that |
1407 | * process's credentials at that time so we can use |
1408 | * them now. |
1409 | */ |
1410 | KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED, |
1411 | ("unp_connect: listener without cached peercred" )); |
1412 | |
1413 | /* Here we need to have both so and so2 locks and so2 |
1414 | * is already locked. Lock ordering is required. |
1415 | */ |
1416 | if (so < so2) { |
1417 | socket_unlock(so: so2, refcount: 0); |
1418 | socket_lock(so, refcount: 0); |
1419 | socket_lock(so: so2, refcount: 0); |
1420 | } else { |
1421 | socket_lock(so, refcount: 0); |
1422 | } |
1423 | |
1424 | /* Check again if the socket state changed when its lock was released */ |
1425 | if ((so->so_state & SS_ISCONNECTED) != 0) { |
1426 | error = EISCONN; |
1427 | socket_unlock(so: so2, refcount: 1); |
1428 | socket_lock(so: so3, refcount: 0); |
1429 | sofreelastref(so3, 1); |
1430 | goto out; |
1431 | } |
1432 | memcpy(dst: &unp->unp_peercred, src: &unp2->unp_peercred, |
1433 | n: sizeof(unp->unp_peercred)); |
1434 | unp->unp_flags |= UNP_HAVEPC; |
1435 | |
1436 | /* Hold the reference on listening socket until the end */ |
1437 | socket_unlock(so: so2, refcount: 0); |
1438 | list_so = so2; |
1439 | |
1440 | /* Lock ordering doesn't matter because so3 was just created */ |
1441 | socket_lock(so: so3, refcount: 1); |
1442 | so2 = so3; |
1443 | |
1444 | /* |
1445 | * Enable tracing for mDNSResponder endpoints. (The use |
1446 | * of sizeof instead of strlen below takes the null |
1447 | * terminating character into account.) |
1448 | */ |
1449 | if (unpst_tracemdns && |
1450 | !strncmp(s1: soun->sun_path, MDNSRESPONDER_PATH, |
1451 | n: sizeof(MDNSRESPONDER_PATH))) { |
1452 | unp->unp_flags |= UNP_TRACE_MDNS; |
1453 | unp2->unp_flags |= UNP_TRACE_MDNS; |
1454 | } |
1455 | } |
1456 | |
1457 | error = unp_connect2(so, so2); |
1458 | |
1459 | decref_out: |
1460 | if (so2 != NULL) { |
1461 | if (so != so2) { |
1462 | socket_unlock(so: so2, refcount: 1); |
1463 | } else { |
1464 | /* Release the extra reference held for the listen socket. |
1465 | * This is possible only for SOCK_DGRAM sockets. We refuse |
1466 | * connecting to the same socket for SOCK_STREAM sockets. |
1467 | */ |
1468 | VERIFY(so2->so_usecount > 0); |
1469 | so2->so_usecount--; |
1470 | } |
1471 | } |
1472 | |
1473 | if (list_so != NULL) { |
1474 | socket_lock(so: list_so, refcount: 0); |
1475 | socket_unlock(so: list_so, refcount: 1); |
1476 | } |
1477 | |
1478 | out: |
1479 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1480 | vnode_put(vp); |
1481 | return error; |
1482 | } |
1483 | |
1484 | /* |
1485 | * Returns: 0 Success |
1486 | * EPROTOTYPE Protocol wrong type for socket |
1487 | * EINVAL Invalid argument |
1488 | */ |
1489 | int |
1490 | unp_connect2(struct socket *so, struct socket *so2) |
1491 | { |
1492 | struct unpcb *unp = sotounpcb(so); |
1493 | struct unpcb *unp2; |
1494 | |
1495 | if (so2->so_type != so->so_type) { |
1496 | return EPROTOTYPE; |
1497 | } |
1498 | |
1499 | unp2 = sotounpcb(so2); |
1500 | |
1501 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1502 | LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1503 | |
1504 | /* Verify both sockets are still opened */ |
1505 | if (unp == 0 || unp2 == 0) { |
1506 | return EINVAL; |
1507 | } |
1508 | |
1509 | unp->unp_conn = unp2; |
1510 | so2->so_usecount++; |
1511 | |
1512 | switch (so->so_type) { |
1513 | case SOCK_DGRAM: |
1514 | LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink); |
1515 | |
1516 | if (so != so2) { |
1517 | /* Avoid lock order reversals due to drop/acquire in soisconnected. */ |
1518 | /* Keep an extra reference on so2 that will be dropped |
1519 | * soon after getting the locks in order |
1520 | */ |
1521 | socket_unlock(so: so2, refcount: 0); |
1522 | soisconnected(so); |
1523 | unp_get_locks_in_order(so, conn_so: so2); |
1524 | VERIFY(so2->so_usecount > 0); |
1525 | so2->so_usecount--; |
1526 | } else { |
1527 | soisconnected(so); |
1528 | } |
1529 | |
1530 | break; |
1531 | |
1532 | case SOCK_STREAM: |
1533 | /* This takes care of socketpair */ |
1534 | if (!(unp->unp_flags & UNP_HAVEPC) && |
1535 | !(unp2->unp_flags & UNP_HAVEPC)) { |
1536 | cru2x(cr: kauth_cred_get(), xcr: &unp->unp_peercred); |
1537 | unp->unp_flags |= UNP_HAVEPC; |
1538 | |
1539 | cru2x(cr: kauth_cred_get(), xcr: &unp2->unp_peercred); |
1540 | unp2->unp_flags |= UNP_HAVEPC; |
1541 | } |
1542 | unp2->unp_conn = unp; |
1543 | so->so_usecount++; |
1544 | |
1545 | /* Avoid lock order reversals due to drop/acquire in soisconnected. */ |
1546 | socket_unlock(so, refcount: 0); |
1547 | soisconnected(so: so2); |
1548 | |
1549 | /* Keep an extra reference on so2, that will be dropped soon after |
1550 | * getting the locks in order again. |
1551 | */ |
1552 | socket_unlock(so: so2, refcount: 0); |
1553 | |
1554 | socket_lock(so, refcount: 0); |
1555 | soisconnected(so); |
1556 | |
1557 | unp_get_locks_in_order(so, conn_so: so2); |
1558 | /* Decrement the extra reference left before */ |
1559 | VERIFY(so2->so_usecount > 0); |
1560 | so2->so_usecount--; |
1561 | break; |
1562 | |
1563 | default: |
1564 | panic("unknown socket type %d in unp_connect2" , so->so_type); |
1565 | } |
1566 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1567 | LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1568 | return 0; |
1569 | } |
1570 | |
1571 | static void |
1572 | unp_disconnect(struct unpcb *unp) |
1573 | { |
1574 | struct unpcb *unp2 = NULL; |
1575 | struct socket *so2 = NULL, *so; |
1576 | struct socket *waitso; |
1577 | int so_locked = 1, strdisconn = 0; |
1578 | |
1579 | so = unp->unp_socket; |
1580 | if (unp->unp_conn == NULL) { |
1581 | return; |
1582 | } |
1583 | lck_mtx_lock(lck: &unp_disconnect_lock); |
1584 | while (disconnect_in_progress != 0) { |
1585 | if (so_locked == 1) { |
1586 | socket_unlock(so, refcount: 0); |
1587 | so_locked = 0; |
1588 | } |
1589 | (void)msleep(chan: (caddr_t)&disconnect_in_progress, mtx: &unp_disconnect_lock, |
1590 | PSOCK, wmesg: "disconnect" , NULL); |
1591 | } |
1592 | disconnect_in_progress = 1; |
1593 | lck_mtx_unlock(lck: &unp_disconnect_lock); |
1594 | |
1595 | if (so_locked == 0) { |
1596 | socket_lock(so, refcount: 0); |
1597 | so_locked = 1; |
1598 | } |
1599 | |
1600 | unp2 = unp->unp_conn; |
1601 | |
1602 | if (unp2 == 0 || unp2->unp_socket == NULL) { |
1603 | goto out; |
1604 | } |
1605 | so2 = unp2->unp_socket; |
1606 | |
1607 | try_again: |
1608 | if (so == so2) { |
1609 | if (so_locked == 0) { |
1610 | socket_lock(so, refcount: 0); |
1611 | } |
1612 | waitso = so; |
1613 | } else if (so < so2) { |
1614 | if (so_locked == 0) { |
1615 | socket_lock(so, refcount: 0); |
1616 | } |
1617 | socket_lock(so: so2, refcount: 1); |
1618 | waitso = so2; |
1619 | } else { |
1620 | if (so_locked == 1) { |
1621 | socket_unlock(so, refcount: 0); |
1622 | } |
1623 | socket_lock(so: so2, refcount: 1); |
1624 | socket_lock(so, refcount: 0); |
1625 | waitso = so; |
1626 | } |
1627 | so_locked = 1; |
1628 | |
1629 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1630 | LCK_MTX_ASSERT(&unp2->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1631 | |
1632 | /* Check for the UNP_DONTDISCONNECT flag, if it |
1633 | * is set, release both sockets and go to sleep |
1634 | */ |
1635 | |
1636 | if ((((struct unpcb *)waitso->so_pcb)->unp_flags & UNP_DONTDISCONNECT) != 0) { |
1637 | if (so != so2) { |
1638 | socket_unlock(so: so2, refcount: 1); |
1639 | } |
1640 | so_locked = 0; |
1641 | |
1642 | (void)msleep(chan: waitso->so_pcb, mtx: &unp->unp_mtx, |
1643 | PSOCK | PDROP, wmesg: "unpdisconnect" , NULL); |
1644 | goto try_again; |
1645 | } |
1646 | |
1647 | if (unp->unp_conn == NULL) { |
1648 | panic("unp_conn became NULL after sleep" ); |
1649 | } |
1650 | |
1651 | unp->unp_conn = NULL; |
1652 | VERIFY(so2->so_usecount > 0); |
1653 | so2->so_usecount--; |
1654 | |
1655 | if (unp->unp_flags & UNP_TRACE_MDNS) { |
1656 | unp->unp_flags &= ~UNP_TRACE_MDNS; |
1657 | } |
1658 | |
1659 | switch (unp->unp_socket->so_type) { |
1660 | case SOCK_DGRAM: |
1661 | LIST_REMOVE(unp, unp_reflink); |
1662 | unp->unp_socket->so_state &= ~SS_ISCONNECTED; |
1663 | if (so != so2) { |
1664 | socket_unlock(so: so2, refcount: 1); |
1665 | } |
1666 | break; |
1667 | |
1668 | case SOCK_STREAM: |
1669 | unp2->unp_conn = NULL; |
1670 | VERIFY(so->so_usecount > 0); |
1671 | so->so_usecount--; |
1672 | |
1673 | /* |
1674 | * Set the socket state correctly but do a wakeup later when |
1675 | * we release all locks except the socket lock, this will avoid |
1676 | * a deadlock. |
1677 | */ |
1678 | unp->unp_socket->so_state &= ~(SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING); |
1679 | unp->unp_socket->so_state |= (SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED); |
1680 | |
1681 | unp2->unp_socket->so_state &= ~(SS_ISCONNECTING | SS_ISCONNECTED | SS_ISDISCONNECTING); |
1682 | unp2->unp_socket->so_state |= (SS_CANTRCVMORE | SS_CANTSENDMORE | SS_ISDISCONNECTED); |
1683 | |
1684 | if (unp2->unp_flags & UNP_TRACE_MDNS) { |
1685 | unp2->unp_flags &= ~UNP_TRACE_MDNS; |
1686 | } |
1687 | |
1688 | strdisconn = 1; |
1689 | break; |
1690 | default: |
1691 | panic("unknown socket type %d" , so->so_type); |
1692 | } |
1693 | out: |
1694 | lck_mtx_lock(lck: &unp_disconnect_lock); |
1695 | disconnect_in_progress = 0; |
1696 | wakeup(chan: &disconnect_in_progress); |
1697 | lck_mtx_unlock(lck: &unp_disconnect_lock); |
1698 | |
1699 | if (strdisconn) { |
1700 | socket_unlock(so, refcount: 0); |
1701 | soisdisconnected(so: so2); |
1702 | socket_unlock(so: so2, refcount: 1); |
1703 | |
1704 | socket_lock(so, refcount: 0); |
1705 | soisdisconnected(so); |
1706 | } |
1707 | LCK_MTX_ASSERT(&unp->unp_mtx, LCK_MTX_ASSERT_OWNED); |
1708 | return; |
1709 | } |
1710 | |
1711 | /* |
1712 | * unpcb_to_compat copies specific bits of a unpcb to a unpcb_compat format. |
1713 | * The unpcb_compat data structure is passed to user space and must not change. |
1714 | */ |
1715 | static void |
1716 | unpcb_to_compat(struct unpcb *up, struct unpcb_compat *cp) |
1717 | { |
1718 | #if defined(__LP64__) |
1719 | cp->unp_link.le_next = (u_int32_t) |
1720 | VM_KERNEL_ADDRHASH(up->unp_link.le_next); |
1721 | cp->unp_link.le_prev = (u_int32_t) |
1722 | VM_KERNEL_ADDRHASH(up->unp_link.le_prev); |
1723 | #else |
1724 | cp->unp_link.le_next = (struct unpcb_compat *) |
1725 | VM_KERNEL_ADDRHASH(up->unp_link.le_next); |
1726 | cp->unp_link.le_prev = (struct unpcb_compat **) |
1727 | VM_KERNEL_ADDRHASH(up->unp_link.le_prev); |
1728 | #endif |
1729 | cp->unp_socket = (_UNPCB_PTR(struct socket *)) |
1730 | VM_KERNEL_ADDRHASH(up->unp_socket); |
1731 | cp->unp_vnode = (_UNPCB_PTR(struct vnode *)) |
1732 | VM_KERNEL_ADDRHASH(up->unp_vnode); |
1733 | cp->unp_ino = up->unp_ino; |
1734 | cp->unp_conn = (_UNPCB_PTR(struct unpcb_compat *)) |
1735 | VM_KERNEL_ADDRHASH(up->unp_conn); |
1736 | cp->unp_refs = (u_int32_t)VM_KERNEL_ADDRHASH(up->unp_refs.lh_first); |
1737 | #if defined(__LP64__) |
1738 | cp->unp_reflink.le_next = |
1739 | (u_int32_t)VM_KERNEL_ADDRHASH(up->unp_reflink.le_next); |
1740 | cp->unp_reflink.le_prev = |
1741 | (u_int32_t)VM_KERNEL_ADDRHASH(up->unp_reflink.le_prev); |
1742 | #else |
1743 | cp->unp_reflink.le_next = |
1744 | (struct unpcb_compat *)VM_KERNEL_ADDRHASH(up->unp_reflink.le_next); |
1745 | cp->unp_reflink.le_prev = |
1746 | (struct unpcb_compat **)VM_KERNEL_ADDRHASH(up->unp_reflink.le_prev); |
1747 | #endif |
1748 | cp->unp_addr = (_UNPCB_PTR(struct sockaddr_un *)) |
1749 | VM_KERNEL_ADDRHASH(up->unp_addr); |
1750 | cp->unp_cc = up->unp_cc; |
1751 | cp->unp_mbcnt = up->unp_mbcnt; |
1752 | cp->unp_gencnt = up->unp_gencnt; |
1753 | } |
1754 | |
1755 | static int |
1756 | unp_pcblist SYSCTL_HANDLER_ARGS |
1757 | { |
1758 | #pragma unused(oidp,arg2) |
1759 | int error, i, n; |
1760 | struct unpcb *unp, **unp_list __bidi_indexable; |
1761 | size_t unp_list_len; |
1762 | unp_gen_t gencnt; |
1763 | struct xunpgen xug; |
1764 | struct unp_head *head; |
1765 | |
1766 | lck_rw_lock_shared(lck: &unp_list_mtx); |
1767 | head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); |
1768 | |
1769 | /* |
1770 | * The process of preparing the PCB list is too time-consuming and |
1771 | * resource-intensive to repeat twice on every request. |
1772 | */ |
1773 | if (req->oldptr == USER_ADDR_NULL) { |
1774 | n = unp_count; |
1775 | req->oldidx = 2 * sizeof(xug) + (n + n / 8) * |
1776 | sizeof(struct xunpcb); |
1777 | lck_rw_done(lck: &unp_list_mtx); |
1778 | return 0; |
1779 | } |
1780 | |
1781 | if (req->newptr != USER_ADDR_NULL) { |
1782 | lck_rw_done(lck: &unp_list_mtx); |
1783 | return EPERM; |
1784 | } |
1785 | |
1786 | /* |
1787 | * OK, now we're committed to doing something. |
1788 | */ |
1789 | gencnt = unp_gencnt; |
1790 | n = unp_count; |
1791 | |
1792 | bzero(s: &xug, n: sizeof(xug)); |
1793 | xug.xug_len = sizeof(xug); |
1794 | xug.xug_count = n; |
1795 | xug.xug_gen = gencnt; |
1796 | xug.xug_sogen = so_gencnt; |
1797 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
1798 | if (error) { |
1799 | lck_rw_done(lck: &unp_list_mtx); |
1800 | return error; |
1801 | } |
1802 | |
1803 | /* |
1804 | * We are done if there is no pcb |
1805 | */ |
1806 | if (n == 0) { |
1807 | lck_rw_done(lck: &unp_list_mtx); |
1808 | return 0; |
1809 | } |
1810 | |
1811 | unp_list_len = n; |
1812 | unp_list = kalloc_type(struct unpcb *, unp_list_len, Z_WAITOK); |
1813 | if (unp_list == 0) { |
1814 | lck_rw_done(lck: &unp_list_mtx); |
1815 | return ENOMEM; |
1816 | } |
1817 | |
1818 | for (unp = head->lh_first, i = 0; unp && i < n; |
1819 | unp = unp->unp_link.le_next) { |
1820 | if (unp->unp_gencnt <= gencnt) { |
1821 | unp_list[i++] = unp; |
1822 | } |
1823 | } |
1824 | n = i; /* in case we lost some during malloc */ |
1825 | |
1826 | error = 0; |
1827 | for (i = 0; i < n; i++) { |
1828 | unp = unp_list[i]; |
1829 | if (unp->unp_gencnt <= gencnt) { |
1830 | struct xunpcb xu; |
1831 | |
1832 | bzero(s: &xu, n: sizeof(xu)); |
1833 | xu.xu_len = sizeof(xu); |
1834 | xu.xu_unpp = (_UNPCB_PTR(struct unpcb_compat *)) |
1835 | VM_KERNEL_ADDRHASH(unp); |
1836 | /* |
1837 | * XXX - need more locking here to protect against |
1838 | * connect/disconnect races for SMP. |
1839 | */ |
1840 | if (unp->unp_addr) { |
1841 | struct sockaddr_un *dst __single = &xu.xu_au.xuu_addr; |
1842 | SOCKADDR_COPY(unp->unp_addr, dst, unp->unp_addr->sun_len); |
1843 | } |
1844 | if (unp->unp_conn && unp->unp_conn->unp_addr) { |
1845 | struct sockaddr_un *dst __single = &xu.xu_cau.xuu_caddr; |
1846 | SOCKADDR_COPY(unp->unp_conn->unp_addr, dst, unp->unp_conn->unp_addr->sun_len); |
1847 | } |
1848 | unpcb_to_compat(up: unp, cp: &xu.xu_unp); |
1849 | sotoxsocket(so: unp->unp_socket, xso: &xu.xu_socket); |
1850 | error = SYSCTL_OUT(req, &xu, sizeof(xu)); |
1851 | } |
1852 | } |
1853 | if (!error) { |
1854 | /* |
1855 | * Give the user an updated idea of our state. |
1856 | * If the generation differs from what we told |
1857 | * her before, she knows that something happened |
1858 | * while we were processing this request, and it |
1859 | * might be necessary to retry. |
1860 | */ |
1861 | bzero(s: &xug, n: sizeof(xug)); |
1862 | xug.xug_len = sizeof(xug); |
1863 | xug.xug_gen = unp_gencnt; |
1864 | xug.xug_sogen = so_gencnt; |
1865 | xug.xug_count = unp_count; |
1866 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
1867 | } |
1868 | kfree_type(struct unpcb *, unp_list_len, unp_list); |
1869 | lck_rw_done(lck: &unp_list_mtx); |
1870 | return error; |
1871 | } |
1872 | |
1873 | const caddr_t SYSCTL_SOCK_DGRAM_ARG = __unsafe_forge_single(caddr_t, SOCK_DGRAM); |
1874 | const caddr_t SYSCTL_SOCK_STREAM_ARG = __unsafe_forge_single(caddr_t, SOCK_STREAM); |
1875 | |
1876 | SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, |
1877 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
1878 | SYSCTL_SOCK_DGRAM_ARG, 0, unp_pcblist, "S,xunpcb" , |
1879 | "List of active local datagram sockets" ); |
1880 | SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, |
1881 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
1882 | SYSCTL_SOCK_STREAM_ARG, 0, unp_pcblist, "S,xunpcb" , |
1883 | "List of active local stream sockets" ); |
1884 | |
1885 | #if XNU_TARGET_OS_OSX |
1886 | |
1887 | static int |
1888 | unp_pcblist64 SYSCTL_HANDLER_ARGS |
1889 | { |
1890 | #pragma unused(oidp,arg2) |
1891 | int error, i, n; |
1892 | struct unpcb *unp, **unp_list; |
1893 | unp_gen_t gencnt; |
1894 | struct xunpgen xug; |
1895 | struct unp_head *head; |
1896 | |
1897 | lck_rw_lock_shared(lck: &unp_list_mtx); |
1898 | head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); |
1899 | |
1900 | /* |
1901 | * The process of preparing the PCB list is too time-consuming and |
1902 | * resource-intensive to repeat twice on every request. |
1903 | */ |
1904 | if (req->oldptr == USER_ADDR_NULL) { |
1905 | n = unp_count; |
1906 | req->oldidx = 2 * sizeof(xug) + (n + n / 8) * |
1907 | (sizeof(struct xunpcb64)); |
1908 | lck_rw_done(lck: &unp_list_mtx); |
1909 | return 0; |
1910 | } |
1911 | |
1912 | if (req->newptr != USER_ADDR_NULL) { |
1913 | lck_rw_done(lck: &unp_list_mtx); |
1914 | return EPERM; |
1915 | } |
1916 | |
1917 | /* |
1918 | * OK, now we're committed to doing something. |
1919 | */ |
1920 | gencnt = unp_gencnt; |
1921 | n = unp_count; |
1922 | |
1923 | bzero(s: &xug, n: sizeof(xug)); |
1924 | xug.xug_len = sizeof(xug); |
1925 | xug.xug_count = n; |
1926 | xug.xug_gen = gencnt; |
1927 | xug.xug_sogen = so_gencnt; |
1928 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
1929 | if (error) { |
1930 | lck_rw_done(lck: &unp_list_mtx); |
1931 | return error; |
1932 | } |
1933 | |
1934 | /* |
1935 | * We are done if there is no pcb |
1936 | */ |
1937 | if (n == 0) { |
1938 | lck_rw_done(lck: &unp_list_mtx); |
1939 | return 0; |
1940 | } |
1941 | |
1942 | size_t unp_list_len = n; |
1943 | unp_list = kalloc_type(struct unpcb *, unp_list_len, Z_WAITOK); |
1944 | if (unp_list == 0) { |
1945 | lck_rw_done(lck: &unp_list_mtx); |
1946 | return ENOMEM; |
1947 | } |
1948 | |
1949 | for (unp = head->lh_first, i = 0; unp && i < n; |
1950 | unp = unp->unp_link.le_next) { |
1951 | if (unp->unp_gencnt <= gencnt) { |
1952 | unp_list[i++] = unp; |
1953 | } |
1954 | } |
1955 | n = i; /* in case we lost some during malloc */ |
1956 | |
1957 | error = 0; |
1958 | for (i = 0; i < n; i++) { |
1959 | unp = unp_list[i]; |
1960 | if (unp->unp_gencnt <= gencnt) { |
1961 | struct xunpcb64 xu; |
1962 | size_t xu_len = sizeof(struct xunpcb64); |
1963 | |
1964 | bzero(s: &xu, n: xu_len); |
1965 | xu.xu_len = (u_int32_t)xu_len; |
1966 | xu.xu_unpp = (u_int64_t)VM_KERNEL_ADDRHASH(unp); |
1967 | xu.xunp_link.le_next = (u_int64_t) |
1968 | VM_KERNEL_ADDRHASH(unp->unp_link.le_next); |
1969 | xu.xunp_link.le_prev = (u_int64_t) |
1970 | VM_KERNEL_ADDRHASH(unp->unp_link.le_prev); |
1971 | xu.xunp_socket = (u_int64_t) |
1972 | VM_KERNEL_ADDRHASH(unp->unp_socket); |
1973 | xu.xunp_vnode = (u_int64_t) |
1974 | VM_KERNEL_ADDRHASH(unp->unp_vnode); |
1975 | xu.xunp_ino = unp->unp_ino; |
1976 | xu.xunp_conn = (u_int64_t) |
1977 | VM_KERNEL_ADDRHASH(unp->unp_conn); |
1978 | xu.xunp_refs = (u_int64_t) |
1979 | VM_KERNEL_ADDRHASH(unp->unp_refs.lh_first); |
1980 | xu.xunp_reflink.le_next = (u_int64_t) |
1981 | VM_KERNEL_ADDRHASH(unp->unp_reflink.le_next); |
1982 | xu.xunp_reflink.le_prev = (u_int64_t) |
1983 | VM_KERNEL_ADDRHASH(unp->unp_reflink.le_prev); |
1984 | xu.xunp_cc = unp->unp_cc; |
1985 | xu.xunp_mbcnt = unp->unp_mbcnt; |
1986 | xu.xunp_gencnt = unp->unp_gencnt; |
1987 | |
1988 | if (unp->unp_socket) { |
1989 | sotoxsocket64(so: unp->unp_socket, xso: &xu.xu_socket); |
1990 | } |
1991 | |
1992 | /* |
1993 | * XXX - need more locking here to protect against |
1994 | * connect/disconnect races for SMP. |
1995 | */ |
1996 | if (unp->unp_addr) { |
1997 | bcopy(src: unp->unp_addr, dst: &xu.xu_au, |
1998 | n: unp->unp_addr->sun_len); |
1999 | } |
2000 | if (unp->unp_conn && unp->unp_conn->unp_addr) { |
2001 | bcopy(src: unp->unp_conn->unp_addr, |
2002 | dst: &xu.xu_cau, |
2003 | n: unp->unp_conn->unp_addr->sun_len); |
2004 | } |
2005 | |
2006 | error = SYSCTL_OUT(req, &xu, xu_len); |
2007 | } |
2008 | } |
2009 | if (!error) { |
2010 | /* |
2011 | * Give the user an updated idea of our state. |
2012 | * If the generation differs from what we told |
2013 | * her before, she knows that something happened |
2014 | * while we were processing this request, and it |
2015 | * might be necessary to retry. |
2016 | */ |
2017 | bzero(s: &xug, n: sizeof(xug)); |
2018 | xug.xug_len = sizeof(xug); |
2019 | xug.xug_gen = unp_gencnt; |
2020 | xug.xug_sogen = so_gencnt; |
2021 | xug.xug_count = unp_count; |
2022 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
2023 | } |
2024 | kfree_type(struct unpcb *, unp_list_len, unp_list); |
2025 | lck_rw_done(lck: &unp_list_mtx); |
2026 | return error; |
2027 | } |
2028 | |
2029 | SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist64, |
2030 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
2031 | SYSCTL_SOCK_DGRAM_ARG, 0, unp_pcblist64, "S,xunpcb64" , |
2032 | "List of active local datagram sockets 64 bit" ); |
2033 | SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist64, |
2034 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
2035 | SYSCTL_SOCK_STREAM_ARG, 0, unp_pcblist64, "S,xunpcb64" , |
2036 | "List of active local stream sockets 64 bit" ); |
2037 | |
2038 | #endif /* XNU_TARGET_OS_OSX */ |
2039 | |
2040 | static int |
2041 | unp_pcblist_n SYSCTL_HANDLER_ARGS |
2042 | { |
2043 | #pragma unused(oidp,arg2) |
2044 | int error = 0; |
2045 | int i, n; |
2046 | struct unpcb *unp; |
2047 | unp_gen_t gencnt; |
2048 | struct xunpgen xug; |
2049 | struct unp_head *head; |
2050 | void *buf __single = NULL; |
2051 | size_t item_size = ROUNDUP64(sizeof(struct xunpcb_n)) + |
2052 | ROUNDUP64(sizeof(struct xsocket_n)) + |
2053 | 2 * ROUNDUP64(sizeof(struct xsockbuf_n)) + |
2054 | ROUNDUP64(sizeof(struct xsockstat_n)); |
2055 | |
2056 | buf = kalloc_data(item_size, Z_WAITOK | Z_ZERO | Z_NOFAIL); |
2057 | |
2058 | lck_rw_lock_shared(lck: &unp_list_mtx); |
2059 | |
2060 | head = ((intptr_t)arg1 == SOCK_DGRAM ? &unp_dhead : &unp_shead); |
2061 | |
2062 | /* |
2063 | * The process of preparing the PCB list is too time-consuming and |
2064 | * resource-intensive to repeat twice on every request. |
2065 | */ |
2066 | if (req->oldptr == USER_ADDR_NULL) { |
2067 | n = unp_count; |
2068 | req->oldidx = 2 * sizeof(xug) + (n + n / 8) * item_size; |
2069 | goto done; |
2070 | } |
2071 | |
2072 | if (req->newptr != USER_ADDR_NULL) { |
2073 | error = EPERM; |
2074 | goto done; |
2075 | } |
2076 | |
2077 | /* |
2078 | * OK, now we're committed to doing something. |
2079 | */ |
2080 | gencnt = unp_gencnt; |
2081 | n = unp_count; |
2082 | |
2083 | bzero(s: &xug, n: sizeof(xug)); |
2084 | xug.xug_len = sizeof(xug); |
2085 | xug.xug_count = n; |
2086 | xug.xug_gen = gencnt; |
2087 | xug.xug_sogen = so_gencnt; |
2088 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
2089 | if (error != 0) { |
2090 | goto done; |
2091 | } |
2092 | |
2093 | /* |
2094 | * We are done if there is no pcb |
2095 | */ |
2096 | if (n == 0) { |
2097 | goto done; |
2098 | } |
2099 | |
2100 | for (i = 0, unp = head->lh_first; |
2101 | i < n && unp != NULL; |
2102 | i++, unp = unp->unp_link.le_next) { |
2103 | struct xunpcb_n *xu = (struct xunpcb_n *)buf; |
2104 | struct xsocket_n *xso = (struct xsocket_n *) |
2105 | ADVANCE64(xu, sizeof(*xu)); |
2106 | struct xsockbuf_n *xsbrcv = (struct xsockbuf_n *) |
2107 | ADVANCE64(xso, sizeof(*xso)); |
2108 | struct xsockbuf_n *xsbsnd = (struct xsockbuf_n *) |
2109 | ADVANCE64(xsbrcv, sizeof(*xsbrcv)); |
2110 | struct xsockstat_n *xsostats = (struct xsockstat_n *) |
2111 | ADVANCE64(xsbsnd, sizeof(*xsbsnd)); |
2112 | |
2113 | if (unp->unp_gencnt > gencnt) { |
2114 | continue; |
2115 | } |
2116 | |
2117 | bzero(s: buf, n: item_size); |
2118 | |
2119 | xu->xunp_len = sizeof(struct xunpcb_n); |
2120 | xu->xunp_kind = XSO_UNPCB; |
2121 | xu->xunp_unpp = (uint64_t)VM_KERNEL_ADDRHASH(unp); |
2122 | xu->xunp_vnode = (uint64_t)VM_KERNEL_ADDRHASH(unp->unp_vnode); |
2123 | xu->xunp_ino = unp->unp_ino; |
2124 | xu->xunp_conn = (uint64_t)VM_KERNEL_ADDRHASH(unp->unp_conn); |
2125 | xu->xunp_refs = (uint64_t)VM_KERNEL_ADDRHASH(unp->unp_refs.lh_first); |
2126 | xu->xunp_reflink = (uint64_t)VM_KERNEL_ADDRHASH(unp->unp_reflink.le_next); |
2127 | xu->xunp_cc = unp->unp_cc; |
2128 | xu->xunp_mbcnt = unp->unp_mbcnt; |
2129 | xu->xunp_flags = unp->unp_flags; |
2130 | xu->xunp_gencnt = unp->unp_gencnt; |
2131 | |
2132 | if (unp->unp_addr) { |
2133 | struct sockaddr_un *dst __single = &xu->xu_au.xuu_addr; |
2134 | SOCKADDR_COPY(unp->unp_addr, dst, unp->unp_addr->sun_len); |
2135 | } |
2136 | if (unp->unp_conn && unp->unp_conn->unp_addr) { |
2137 | struct sockaddr_un *dst __single = &xu->xu_cau.xuu_caddr; |
2138 | SOCKADDR_COPY(unp->unp_conn->unp_addr, dst, unp->unp_conn->unp_addr->sun_len); |
2139 | } |
2140 | sotoxsocket_n(unp->unp_socket, xso); |
2141 | sbtoxsockbuf_n(unp->unp_socket ? |
2142 | &unp->unp_socket->so_rcv : NULL, xsbrcv); |
2143 | sbtoxsockbuf_n(unp->unp_socket ? |
2144 | &unp->unp_socket->so_snd : NULL, xsbsnd); |
2145 | sbtoxsockstat_n(unp->unp_socket, xsostats); |
2146 | |
2147 | error = SYSCTL_OUT(req, buf, item_size); |
2148 | if (error != 0) { |
2149 | break; |
2150 | } |
2151 | } |
2152 | if (error == 0) { |
2153 | /* |
2154 | * Give the user an updated idea of our state. |
2155 | * If the generation differs from what we told |
2156 | * her before, she knows that something happened |
2157 | * while we were processing this request, and it |
2158 | * might be necessary to retry. |
2159 | */ |
2160 | bzero(s: &xug, n: sizeof(xug)); |
2161 | xug.xug_len = sizeof(xug); |
2162 | xug.xug_gen = unp_gencnt; |
2163 | xug.xug_sogen = so_gencnt; |
2164 | xug.xug_count = unp_count; |
2165 | error = SYSCTL_OUT(req, &xug, sizeof(xug)); |
2166 | } |
2167 | done: |
2168 | lck_rw_done(lck: &unp_list_mtx); |
2169 | kfree_data(buf, item_size); |
2170 | return error; |
2171 | } |
2172 | |
2173 | SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist_n, |
2174 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
2175 | SYSCTL_SOCK_DGRAM_ARG, 0, unp_pcblist_n, "S,xunpcb_n" , |
2176 | "List of active local datagram sockets" ); |
2177 | SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist_n, |
2178 | CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, |
2179 | SYSCTL_SOCK_STREAM_ARG, 0, unp_pcblist_n, "S,xunpcb_n" , |
2180 | "List of active local stream sockets" ); |
2181 | |
2182 | static void |
2183 | unp_shutdown(struct unpcb *unp) |
2184 | { |
2185 | struct socket *so = unp->unp_socket; |
2186 | struct socket *so2; |
2187 | if (unp->unp_socket->so_type == SOCK_STREAM && unp->unp_conn) { |
2188 | so2 = unp->unp_conn->unp_socket; |
2189 | unp_get_locks_in_order(so, conn_so: so2); |
2190 | socantrcvmore(so: so2); |
2191 | socket_unlock(so: so2, refcount: 1); |
2192 | } |
2193 | } |
2194 | |
2195 | static void |
2196 | unp_drop(struct unpcb *unp, int errno) |
2197 | { |
2198 | struct socket *so = unp->unp_socket; |
2199 | |
2200 | so->so_error = (u_short)errno; |
2201 | unp_disconnect(unp); |
2202 | } |
2203 | |
2204 | /* |
2205 | * fg_insertuipc_mark |
2206 | * |
2207 | * Description: Mark fileglob for insertion onto message queue if needed |
2208 | * Also takes fileglob reference |
2209 | * |
2210 | * Parameters: fg Fileglob pointer to insert |
2211 | * |
2212 | * Returns: true, if the fileglob needs to be inserted onto msg queue |
2213 | * |
2214 | * Locks: Takes and drops fg_lock, potentially many times |
2215 | */ |
2216 | static boolean_t |
2217 | fg_insertuipc_mark(struct fileglob * fg) |
2218 | { |
2219 | boolean_t insert = FALSE; |
2220 | |
2221 | lck_mtx_lock_spin(lck: &fg->fg_lock); |
2222 | while (fg->fg_lflags & FG_RMMSGQ) { |
2223 | lck_mtx_convert_spin(lck: &fg->fg_lock); |
2224 | |
2225 | fg->fg_lflags |= FG_WRMMSGQ; |
2226 | msleep(chan: &fg->fg_lflags, mtx: &fg->fg_lock, pri: 0, wmesg: "fg_insertuipc" , NULL); |
2227 | } |
2228 | |
2229 | os_ref_retain_raw(&fg->fg_count, &f_refgrp); |
2230 | fg->fg_msgcount++; |
2231 | if (fg->fg_msgcount == 1) { |
2232 | fg->fg_lflags |= FG_INSMSGQ; |
2233 | insert = TRUE; |
2234 | } |
2235 | lck_mtx_unlock(lck: &fg->fg_lock); |
2236 | return insert; |
2237 | } |
2238 | |
2239 | /* |
2240 | * fg_insertuipc |
2241 | * |
2242 | * Description: Insert marked fileglob onto message queue |
2243 | * |
2244 | * Parameters: fg Fileglob pointer to insert |
2245 | * |
2246 | * Returns: void |
2247 | * |
2248 | * Locks: Takes and drops fg_lock & uipc_lock |
2249 | * DO NOT call this function with proc_fdlock held as unp_gc() |
2250 | * can potentially try to acquire proc_fdlock, which can result |
2251 | * in a deadlock. |
2252 | */ |
2253 | static void |
2254 | fg_insertuipc(struct fileglob * fg) |
2255 | { |
2256 | if (fg->fg_lflags & FG_INSMSGQ) { |
2257 | lck_mtx_lock(lck: &uipc_lock); |
2258 | LIST_INSERT_HEAD(&unp_msghead, fg, f_msglist); |
2259 | lck_mtx_unlock(lck: &uipc_lock); |
2260 | lck_mtx_lock(lck: &fg->fg_lock); |
2261 | fg->fg_lflags &= ~FG_INSMSGQ; |
2262 | if (fg->fg_lflags & FG_WINSMSGQ) { |
2263 | fg->fg_lflags &= ~FG_WINSMSGQ; |
2264 | wakeup(chan: &fg->fg_lflags); |
2265 | } |
2266 | lck_mtx_unlock(lck: &fg->fg_lock); |
2267 | } |
2268 | } |
2269 | |
2270 | /* |
2271 | * fg_removeuipc_mark |
2272 | * |
2273 | * Description: Mark the fileglob for removal from message queue if needed |
2274 | * Also releases fileglob message queue reference |
2275 | * |
2276 | * Parameters: fg Fileglob pointer to remove |
2277 | * |
2278 | * Returns: true, if the fileglob needs to be removed from msg queue |
2279 | * |
2280 | * Locks: Takes and drops fg_lock, potentially many times |
2281 | */ |
2282 | static boolean_t |
2283 | fg_removeuipc_mark(struct fileglob * fg) |
2284 | { |
2285 | boolean_t remove = FALSE; |
2286 | |
2287 | lck_mtx_lock_spin(lck: &fg->fg_lock); |
2288 | while (fg->fg_lflags & FG_INSMSGQ) { |
2289 | lck_mtx_convert_spin(lck: &fg->fg_lock); |
2290 | |
2291 | fg->fg_lflags |= FG_WINSMSGQ; |
2292 | msleep(chan: &fg->fg_lflags, mtx: &fg->fg_lock, pri: 0, wmesg: "fg_removeuipc" , NULL); |
2293 | } |
2294 | fg->fg_msgcount--; |
2295 | if (fg->fg_msgcount == 0) { |
2296 | fg->fg_lflags |= FG_RMMSGQ; |
2297 | remove = TRUE; |
2298 | } |
2299 | lck_mtx_unlock(lck: &fg->fg_lock); |
2300 | return remove; |
2301 | } |
2302 | |
2303 | /* |
2304 | * fg_removeuipc |
2305 | * |
2306 | * Description: Remove marked fileglob from message queue |
2307 | * |
2308 | * Parameters: fg Fileglob pointer to remove |
2309 | * |
2310 | * Returns: void |
2311 | * |
2312 | * Locks: Takes and drops fg_lock & uipc_lock |
2313 | * DO NOT call this function with proc_fdlock held as unp_gc() |
2314 | * can potentially try to acquire proc_fdlock, which can result |
2315 | * in a deadlock. |
2316 | */ |
2317 | static void |
2318 | fg_removeuipc(struct fileglob * fg) |
2319 | { |
2320 | if (fg->fg_lflags & FG_RMMSGQ) { |
2321 | lck_mtx_lock(lck: &uipc_lock); |
2322 | LIST_REMOVE(fg, f_msglist); |
2323 | lck_mtx_unlock(lck: &uipc_lock); |
2324 | lck_mtx_lock(lck: &fg->fg_lock); |
2325 | fg->fg_lflags &= ~FG_RMMSGQ; |
2326 | if (fg->fg_lflags & FG_WRMMSGQ) { |
2327 | fg->fg_lflags &= ~FG_WRMMSGQ; |
2328 | wakeup(chan: &fg->fg_lflags); |
2329 | } |
2330 | lck_mtx_unlock(lck: &fg->fg_lock); |
2331 | } |
2332 | } |
2333 | |
2334 | /* |
2335 | * Returns: 0 Success |
2336 | * EMSGSIZE The new fd's will not fit |
2337 | * ENOBUFS Cannot alloc struct fileproc |
2338 | */ |
2339 | int |
2340 | unp_externalize(struct mbuf *rights) |
2341 | { |
2342 | proc_t p = current_proc(); |
2343 | struct cmsghdr *cm = mtod(rights, struct cmsghdr *); |
2344 | struct fileglob **rp = (struct fileglob **)(cm + 1); |
2345 | const int newfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); |
2346 | int *fds __bidi_indexable; |
2347 | int error = 0; |
2348 | |
2349 | fds = kalloc_data(newfds * sizeof(int), Z_WAITOK); |
2350 | if (fds == NULL) { |
2351 | error = ENOMEM; |
2352 | goto out; |
2353 | } |
2354 | |
2355 | /* |
2356 | * Step 1: |
2357 | * Allocate all the fds, and if it doesn't fit, |
2358 | * then fail and discard everything. |
2359 | */ |
2360 | proc_fdlock(p); |
2361 | |
2362 | if (fdt_available_locked(p, n: newfds)) { |
2363 | for (int i = 0; i < newfds; i++) { |
2364 | error = fdalloc(p, want: 0, result: &fds[i]); |
2365 | if (error) { |
2366 | while (i-- > 0) { |
2367 | fdrelse(p, fd: fds[i]); |
2368 | } |
2369 | break; |
2370 | } |
2371 | } |
2372 | } else { |
2373 | error = EMSGSIZE; |
2374 | } |
2375 | |
2376 | proc_fdunlock(p); |
2377 | |
2378 | if (error) { |
2379 | goto out; |
2380 | } |
2381 | |
2382 | /* |
2383 | * Step 2: |
2384 | * At this point we are commited, and can't fail anymore. |
2385 | * Allocate all the fileprocs, and remove the files |
2386 | * from the queue. |
2387 | * |
2388 | * Until we call procfdtbl_releasefd(), fds are in flux |
2389 | * and can't be closed. |
2390 | */ |
2391 | for (int i = 0; i < newfds; i++) { |
2392 | struct fileproc *fp = NULL; |
2393 | |
2394 | fp = fileproc_alloc_init(); |
2395 | fp->fp_glob = rp[i]; |
2396 | if (fg_removeuipc_mark(fg: rp[i])) { |
2397 | fg_removeuipc(fg: rp[i]); |
2398 | } |
2399 | |
2400 | proc_fdlock(p); |
2401 | procfdtbl_releasefd(p, fd: fds[i], fp); |
2402 | proc_fdunlock(p); |
2403 | } |
2404 | |
2405 | /* |
2406 | * Step 3: |
2407 | * Return the fds into `cm`. |
2408 | * Handle the fact ints and pointers do not have the same size. |
2409 | */ |
2410 | int *fds_out = (int *)(cm + 1); |
2411 | memcpy(dst: fds_out, src: fds, n: newfds * sizeof(int)); |
2412 | if (sizeof(struct fileglob *) != sizeof(int)) { |
2413 | bzero(s: fds_out + newfds, |
2414 | n: newfds * (sizeof(struct fileglob *) - sizeof(int))); |
2415 | } |
2416 | OSAddAtomic(-newfds, &unp_rights); |
2417 | |
2418 | out: |
2419 | if (error) { |
2420 | for (int i = 0; i < newfds; i++) { |
2421 | unp_discard(rp[i], p); |
2422 | } |
2423 | bzero(s: rp, n: newfds * sizeof(struct fileglob *)); |
2424 | } |
2425 | |
2426 | kfree_data(fds, newfds * sizeof(int)); |
2427 | return error; |
2428 | } |
2429 | |
2430 | void |
2431 | unp_init(void) |
2432 | { |
2433 | _CASSERT(UIPC_MAX_CMSG_FD >= (MCLBYTES / sizeof(int))); |
2434 | LIST_INIT(&unp_dhead); |
2435 | LIST_INIT(&unp_shead); |
2436 | } |
2437 | |
2438 | #ifndef MIN |
2439 | #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
2440 | #endif |
2441 | |
2442 | /* |
2443 | * Returns: 0 Success |
2444 | * EINVAL |
2445 | * EBADF |
2446 | */ |
2447 | static int |
2448 | unp_internalize(struct mbuf *control, proc_t p) |
2449 | { |
2450 | struct cmsghdr *cm = mtod(control, struct cmsghdr *); |
2451 | int *fds; |
2452 | struct fileglob **rp; |
2453 | struct fileproc *fp; |
2454 | int i, error; |
2455 | int oldfds; |
2456 | uint8_t fg_ins[UIPC_MAX_CMSG_FD / 8]; |
2457 | |
2458 | /* 64bit: cmsg_len is 'uint32_t', m_len is 'long' */ |
2459 | if (cm->cmsg_type != SCM_RIGHTS || cm->cmsg_level != SOL_SOCKET || |
2460 | (socklen_t)cm->cmsg_len != (socklen_t)control->m_len) { |
2461 | return EINVAL; |
2462 | } |
2463 | oldfds = (cm->cmsg_len - sizeof(*cm)) / sizeof(int); |
2464 | bzero(s: fg_ins, n: sizeof(fg_ins)); |
2465 | |
2466 | proc_fdlock(p); |
2467 | fds = (int *)(cm + 1); |
2468 | |
2469 | for (i = 0; i < oldfds; i++) { |
2470 | struct fileproc *tmpfp; |
2471 | if ((tmpfp = fp_get_noref_locked(p, fd: fds[i])) == NULL) { |
2472 | proc_fdunlock(p); |
2473 | return EBADF; |
2474 | } else if (!fg_sendable(fg: tmpfp->fp_glob)) { |
2475 | proc_fdunlock(p); |
2476 | return EINVAL; |
2477 | } else if (fp_isguarded(fp: tmpfp, GUARD_SOCKET_IPC)) { |
2478 | error = fp_guard_exception(p, |
2479 | fd: fds[i], fp: tmpfp, attribs: kGUARD_EXC_SOCKET_IPC); |
2480 | proc_fdunlock(p); |
2481 | return error; |
2482 | } |
2483 | } |
2484 | rp = (struct fileglob **)(cm + 1); |
2485 | |
2486 | /* On K64 we need to walk backwards because a fileglob * is twice the size of an fd |
2487 | * and doing them in-order would result in stomping over unprocessed fd's |
2488 | */ |
2489 | for (i = (oldfds - 1); i >= 0; i--) { |
2490 | fp = fp_get_noref_locked(p, fd: fds[i]); |
2491 | if (fg_insertuipc_mark(fg: fp->fp_glob)) { |
2492 | fg_ins[i / 8] |= 0x80 >> (i % 8); |
2493 | } |
2494 | rp[i] = fp->fp_glob; |
2495 | } |
2496 | proc_fdunlock(p); |
2497 | |
2498 | for (i = 0; i < oldfds; i++) { |
2499 | if (fg_ins[i / 8] & (0x80 >> (i % 8))) { |
2500 | VERIFY(rp[i]->fg_lflags & FG_INSMSGQ); |
2501 | fg_insertuipc(fg: rp[i]); |
2502 | } |
2503 | (void) OSAddAtomic(1, &unp_rights); |
2504 | } |
2505 | |
2506 | return 0; |
2507 | } |
2508 | |
2509 | static void |
2510 | unp_gc(thread_call_param_t arg0, thread_call_param_t arg1) |
2511 | { |
2512 | #pragma unused(arg0, arg1) |
2513 | struct fileglob *fg; |
2514 | struct socket *so; |
2515 | static struct fileglob **; |
2516 | struct fileglob **fpp; |
2517 | int nunref, i; |
2518 | |
2519 | restart: |
2520 | lck_mtx_lock(lck: &uipc_lock); |
2521 | unp_defer = 0; |
2522 | /* |
2523 | * before going through all this, set all FDs to |
2524 | * be NOT defered and NOT externally accessible |
2525 | */ |
2526 | LIST_FOREACH(fg, &unp_msghead, f_msglist) { |
2527 | os_atomic_andnot(&fg->fg_flag, FMARK | FDEFER, relaxed); |
2528 | } |
2529 | do { |
2530 | LIST_FOREACH(fg, &unp_msghead, f_msglist) { |
2531 | lck_mtx_lock(lck: &fg->fg_lock); |
2532 | /* |
2533 | * If the file is not open, skip it |
2534 | */ |
2535 | if (os_ref_get_count_raw(rc: &fg->fg_count) == 0) { |
2536 | lck_mtx_unlock(lck: &fg->fg_lock); |
2537 | continue; |
2538 | } |
2539 | /* |
2540 | * If we already marked it as 'defer' in a |
2541 | * previous pass, then try process it this time |
2542 | * and un-mark it |
2543 | */ |
2544 | if (fg->fg_flag & FDEFER) { |
2545 | os_atomic_andnot(&fg->fg_flag, FDEFER, relaxed); |
2546 | unp_defer--; |
2547 | } else { |
2548 | /* |
2549 | * if it's not defered, then check if it's |
2550 | * already marked.. if so skip it |
2551 | */ |
2552 | if (fg->fg_flag & FMARK) { |
2553 | lck_mtx_unlock(lck: &fg->fg_lock); |
2554 | continue; |
2555 | } |
2556 | /* |
2557 | * If all references are from messages |
2558 | * in transit, then skip it. it's not |
2559 | * externally accessible. |
2560 | */ |
2561 | if (os_ref_get_count_raw(rc: &fg->fg_count) == |
2562 | fg->fg_msgcount) { |
2563 | lck_mtx_unlock(lck: &fg->fg_lock); |
2564 | continue; |
2565 | } |
2566 | /* |
2567 | * If it got this far then it must be |
2568 | * externally accessible. |
2569 | */ |
2570 | os_atomic_or(&fg->fg_flag, FMARK, relaxed); |
2571 | } |
2572 | /* |
2573 | * either it was defered, or it is externally |
2574 | * accessible and not already marked so. |
2575 | * Now check if it is possibly one of OUR sockets. |
2576 | */ |
2577 | if (FILEGLOB_DTYPE(fg) != DTYPE_SOCKET || |
2578 | (so = (struct socket *)fg_get_data(fg)) == 0) { |
2579 | lck_mtx_unlock(lck: &fg->fg_lock); |
2580 | continue; |
2581 | } |
2582 | if (so->so_proto->pr_domain != localdomain || |
2583 | (so->so_proto->pr_flags & PR_RIGHTS) == 0) { |
2584 | lck_mtx_unlock(lck: &fg->fg_lock); |
2585 | continue; |
2586 | } |
2587 | /* |
2588 | * So, Ok, it's one of our sockets and it IS externally |
2589 | * accessible (or was defered). Now we look |
2590 | * to see if we hold any file descriptors in its |
2591 | * message buffers. Follow those links and mark them |
2592 | * as accessible too. |
2593 | * |
2594 | * In case a file is passed onto itself we need to |
2595 | * release the file lock. |
2596 | */ |
2597 | lck_mtx_unlock(lck: &fg->fg_lock); |
2598 | /* |
2599 | * It's safe to lock the socket after dropping fg_lock |
2600 | * because the socket isn't going away at this point. |
2601 | * |
2602 | * If we couldn't lock the socket or the socket buffer, |
2603 | * then it's because someone holding one of these |
2604 | * locks is stuck in unp_{internalize,externalize}(). |
2605 | * Yield to that process and restart the garbage |
2606 | * collection. |
2607 | */ |
2608 | if (!socket_try_lock(so)) { |
2609 | lck_mtx_unlock(lck: &uipc_lock); |
2610 | goto restart; |
2611 | } |
2612 | so->so_usecount++; |
2613 | /* |
2614 | * Lock the receive socket buffer so that we can |
2615 | * iterate over its mbuf list. |
2616 | */ |
2617 | if (sblock(sb: &so->so_rcv, SBL_NOINTR | SBL_IGNDEFUNCT)) { |
2618 | socket_unlock(so, refcount: 1); |
2619 | lck_mtx_unlock(lck: &uipc_lock); |
2620 | goto restart; |
2621 | } |
2622 | VERIFY(so->so_rcv.sb_flags & SB_LOCK); |
2623 | socket_unlock(so, refcount: 0); |
2624 | unp_scan(so->so_rcv.sb_mb, unp_mark, arg: 0); |
2625 | socket_lock(so, refcount: 0); |
2626 | sbunlock(sb: &so->so_rcv, TRUE); |
2627 | /* |
2628 | * Unlock and release the reference acquired above. |
2629 | */ |
2630 | socket_unlock(so, refcount: 1); |
2631 | } |
2632 | } while (unp_defer); |
2633 | /* |
2634 | * We grab an extra reference to each of the file table entries |
2635 | * that are not otherwise accessible and then free the rights |
2636 | * that are stored in messages on them. |
2637 | * |
2638 | * Here, we first take an extra reference to each inaccessible |
2639 | * descriptor. Then, we call sorflush ourself, since we know |
2640 | * it is a Unix domain socket anyhow. After we destroy all the |
2641 | * rights carried in messages, we do a last closef to get rid |
2642 | * of our extra reference. This is the last close, and the |
2643 | * unp_detach etc will shut down the socket. |
2644 | * |
2645 | * 91/09/19, bsy@cs.cmu.edu |
2646 | */ |
2647 | size_t = nfiles; |
2648 | extra_ref = kalloc_type(struct fileglob *, extra_ref_size, Z_WAITOK); |
2649 | if (extra_ref == NULL) { |
2650 | lck_mtx_unlock(lck: &uipc_lock); |
2651 | return; |
2652 | } |
2653 | nunref = 0; |
2654 | fpp = extra_ref; |
2655 | LIST_FOREACH(fg, &unp_msghead, f_msglist) { |
2656 | lck_mtx_lock(lck: &fg->fg_lock); |
2657 | /* |
2658 | * If it's not open, skip it |
2659 | */ |
2660 | if (os_ref_get_count_raw(rc: &fg->fg_count) == 0) { |
2661 | lck_mtx_unlock(lck: &fg->fg_lock); |
2662 | continue; |
2663 | } |
2664 | /* |
2665 | * If all refs are from msgs, and it's not marked accessible |
2666 | * then it must be referenced from some unreachable cycle |
2667 | * of (shut-down) FDs, so include it in our |
2668 | * list of FDs to remove |
2669 | */ |
2670 | if (fg->fg_flag & FMARK) { |
2671 | lck_mtx_unlock(lck: &fg->fg_lock); |
2672 | continue; |
2673 | } |
2674 | if (os_ref_get_count_raw(rc: &fg->fg_count) == fg->fg_msgcount) { |
2675 | os_ref_retain_raw(&fg->fg_count, &f_refgrp); |
2676 | *fpp++ = fg; |
2677 | nunref++; |
2678 | } |
2679 | lck_mtx_unlock(lck: &fg->fg_lock); |
2680 | } |
2681 | lck_mtx_unlock(lck: &uipc_lock); |
2682 | |
2683 | /* |
2684 | * for each FD on our hit list, do the following two things |
2685 | */ |
2686 | for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { |
2687 | struct fileglob *tfg; |
2688 | |
2689 | tfg = *fpp; |
2690 | |
2691 | if (FILEGLOB_DTYPE(tfg) == DTYPE_SOCKET) { |
2692 | so = (struct socket *)fg_get_data(fg: tfg); |
2693 | |
2694 | if (so) { |
2695 | socket_lock(so, refcount: 0); |
2696 | sorflush(so); |
2697 | socket_unlock(so, refcount: 0); |
2698 | } |
2699 | } |
2700 | } |
2701 | for (i = nunref, fpp = extra_ref; --i >= 0; ++fpp) { |
2702 | fg_drop(PROC_NULL, fg: *fpp); |
2703 | } |
2704 | |
2705 | kfree_type(struct fileglob *, extra_ref_size, extra_ref); |
2706 | } |
2707 | |
2708 | void |
2709 | unp_dispose(struct mbuf *m) |
2710 | { |
2711 | if (m) { |
2712 | unp_scan(m, unp_discard, NULL); |
2713 | } |
2714 | } |
2715 | |
2716 | /* |
2717 | * Returns: 0 Success |
2718 | */ |
2719 | static int |
2720 | unp_listen(struct unpcb *unp, proc_t p) |
2721 | { |
2722 | kauth_cred_t safecred __single = kauth_cred_proc_ref(procp: p); |
2723 | cru2x(cr: safecred, xcr: &unp->unp_peercred); |
2724 | kauth_cred_unref(&safecred); |
2725 | unp->unp_flags |= UNP_HAVEPCCACHED; |
2726 | return 0; |
2727 | } |
2728 | |
2729 | static void |
2730 | unp_scan(struct mbuf *m0, void (*op)(struct fileglob *, void *arg), void *arg) |
2731 | { |
2732 | struct mbuf *m; |
2733 | struct fileglob **rp; |
2734 | struct cmsghdr *cm; |
2735 | int i; |
2736 | int qfds; |
2737 | |
2738 | while (m0) { |
2739 | for (m = m0; m; m = m->m_next) { |
2740 | if (m->m_type == MT_CONTROL && |
2741 | (size_t)m->m_len >= sizeof(*cm)) { |
2742 | cm = mtod(m, struct cmsghdr *); |
2743 | if (cm->cmsg_level != SOL_SOCKET || |
2744 | cm->cmsg_type != SCM_RIGHTS) { |
2745 | continue; |
2746 | } |
2747 | qfds = (cm->cmsg_len - sizeof(*cm)) / |
2748 | sizeof(int); |
2749 | rp = (struct fileglob **)(cm + 1); |
2750 | for (i = 0; i < qfds; i++) { |
2751 | (*op)(*rp++, arg); |
2752 | } |
2753 | break; /* XXX, but saves time */ |
2754 | } |
2755 | } |
2756 | m0 = m0->m_act; |
2757 | } |
2758 | } |
2759 | |
2760 | static void |
2761 | unp_mark(struct fileglob *fg, __unused void *arg) |
2762 | { |
2763 | uint32_t oflags, nflags; |
2764 | |
2765 | os_atomic_rmw_loop(&fg->fg_flag, oflags, nflags, relaxed, { |
2766 | if (oflags & FMARK) { |
2767 | os_atomic_rmw_loop_give_up(return ); |
2768 | } |
2769 | nflags = oflags | FMARK | FDEFER; |
2770 | }); |
2771 | |
2772 | unp_defer++; |
2773 | } |
2774 | |
2775 | static void |
2776 | unp_discard(struct fileglob *fg, void *p) |
2777 | { |
2778 | if (p == NULL) { |
2779 | p = current_proc(); /* XXX */ |
2780 | } |
2781 | (void) OSAddAtomic(1, &unp_disposed); |
2782 | if (fg_removeuipc_mark(fg)) { |
2783 | VERIFY(fg->fg_lflags & FG_RMMSGQ); |
2784 | fg_removeuipc(fg); |
2785 | } |
2786 | (void) OSAddAtomic(-1, &unp_rights); |
2787 | |
2788 | (void) fg_drop(p, fg); |
2789 | } |
2790 | |
2791 | int |
2792 | unp_lock(struct socket *so, int refcount, void * lr) |
2793 | { |
2794 | void * lr_saved __single; |
2795 | if (lr == 0) { |
2796 | lr_saved = __unsafe_forge_single(void*, __builtin_return_address(0)); |
2797 | } else { |
2798 | lr_saved = lr; |
2799 | } |
2800 | |
2801 | if (so->so_pcb) { |
2802 | lck_mtx_lock(lck: &((struct unpcb *)so->so_pcb)->unp_mtx); |
2803 | } else { |
2804 | panic("unp_lock: so=%p NO PCB! lr=%p ref=0x%x" , |
2805 | so, lr_saved, so->so_usecount); |
2806 | } |
2807 | |
2808 | if (so->so_usecount < 0) { |
2809 | panic("unp_lock: so=%p so_pcb=%p lr=%p ref=0x%x" , |
2810 | so, so->so_pcb, lr_saved, so->so_usecount); |
2811 | } |
2812 | |
2813 | if (refcount) { |
2814 | VERIFY(so->so_usecount > 0); |
2815 | so->so_usecount++; |
2816 | } |
2817 | so->lock_lr[so->next_lock_lr] = lr_saved; |
2818 | so->next_lock_lr = (so->next_lock_lr + 1) % SO_LCKDBG_MAX; |
2819 | return 0; |
2820 | } |
2821 | |
2822 | int |
2823 | unp_unlock(struct socket *so, int refcount, void * lr) |
2824 | { |
2825 | void * lr_saved __single; |
2826 | lck_mtx_t * mutex_held = NULL; |
2827 | struct unpcb *unp __single = sotounpcb(so); |
2828 | |
2829 | if (lr == 0) { |
2830 | lr_saved = __unsafe_forge_single(void*, __builtin_return_address(0)); |
2831 | } else { |
2832 | lr_saved = lr; |
2833 | } |
2834 | |
2835 | if (refcount) { |
2836 | so->so_usecount--; |
2837 | } |
2838 | |
2839 | if (so->so_usecount < 0) { |
2840 | panic("unp_unlock: so=%p usecount=%x" , so, so->so_usecount); |
2841 | } |
2842 | if (so->so_pcb == NULL) { |
2843 | panic("unp_unlock: so=%p NO PCB usecount=%x" , so, so->so_usecount); |
2844 | } else { |
2845 | mutex_held = &((struct unpcb *)so->so_pcb)->unp_mtx; |
2846 | } |
2847 | LCK_MTX_ASSERT(mutex_held, LCK_MTX_ASSERT_OWNED); |
2848 | so->unlock_lr[so->next_unlock_lr] = lr_saved; |
2849 | so->next_unlock_lr = (so->next_unlock_lr + 1) % SO_LCKDBG_MAX; |
2850 | |
2851 | if (so->so_usecount == 0 && (so->so_flags & SOF_PCBCLEARING)) { |
2852 | sofreelastref(so, 1); |
2853 | |
2854 | if (unp->unp_addr != NULL) { |
2855 | free_sockaddr(unp->unp_addr); |
2856 | } |
2857 | |
2858 | lck_mtx_unlock(lck: mutex_held); |
2859 | |
2860 | lck_mtx_destroy(lck: &unp->unp_mtx, grp: &unp_mtx_grp); |
2861 | zfree(unp_zone, unp); |
2862 | thread_call_enter(call: unp_gc_tcall); |
2863 | } else { |
2864 | lck_mtx_unlock(lck: mutex_held); |
2865 | } |
2866 | |
2867 | return 0; |
2868 | } |
2869 | |
2870 | lck_mtx_t * |
2871 | unp_getlock(struct socket *so, __unused int flags) |
2872 | { |
2873 | struct unpcb *unp = (struct unpcb *)so->so_pcb; |
2874 | |
2875 | |
2876 | if (so->so_pcb) { |
2877 | if (so->so_usecount < 0) { |
2878 | panic("unp_getlock: so=%p usecount=%x" , so, so->so_usecount); |
2879 | } |
2880 | return &unp->unp_mtx; |
2881 | } else { |
2882 | panic("unp_getlock: so=%p NULL so_pcb" , so); |
2883 | return so->so_proto->pr_domain->dom_mtx; |
2884 | } |
2885 | } |
2886 | |