1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2004-2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
32 */
33
34 /*
35 * UNIX Domain (Local) Sockets
36 *
37 * This is an implementation of UNIX (local) domain sockets. Each socket has
38 * an associated struct unpcb (UNIX protocol control block). Stream sockets
39 * may be connected to 0 or 1 other socket. Datagram sockets may be
40 * connected to 0, 1, or many other sockets. Sockets may be created and
41 * connected in pairs (socketpair(2)), or bound/connected to using the file
42 * system name space. For most purposes, only the receive socket buffer is
43 * used, as sending on one socket delivers directly to the receive socket
44 * buffer of a second socket.
45 *
46 * The implementation is substantially complicated by the fact that
47 * "ancillary data", such as file descriptors or credentials, may be passed
48 * across UNIX domain sockets. The potential for passing UNIX domain sockets
49 * over other UNIX domain sockets requires the implementation of a simple
50 * garbage collector to find and tear down cycles of disconnected sockets.
51 *
52 * TODO:
53 * RDM
54 * rethink name space problems
55 * need a proper out-of-band
56 */
57
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD: releng/11.1/sys/kern/uipc_usrreq.c 305159 2016-08-31 21:35:12Z markj $");
60
61 #include "opt_ddb.h"
62
63 #include <sys/param.h>
64 #include <sys/capsicum.h>
65 #include <sys/domain.h>
66 #include <sys/fcntl.h>
67 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */
68 #include <sys/eventhandler.h>
69 #include <sys/file.h>
70 #include <sys/filedesc.h>
71 #include <sys/kernel.h>
72 #include <sys/lock.h>
73 #include <sys/mbuf.h>
74 #include <sys/mount.h>
75 #include <sys/mutex.h>
76 #include <sys/namei.h>
77 #include <sys/proc.h>
78 #include <sys/protosw.h>
79 #include <sys/queue.h>
80 #include <sys/resourcevar.h>
81 #include <sys/rwlock.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/signalvar.h>
85 #include <sys/stat.h>
86 #include <sys/sx.h>
87 #include <sys/sysctl.h>
88 #include <sys/systm.h>
89 #include <sys/taskqueue.h>
90 #include <sys/un.h>
91 #include <sys/unpcb.h>
92 #include <sys/vnode.h>
93
94 #include <net/vnet.h>
95
96 #ifdef DDB
97 #include <ddb/ddb.h>
98 #endif
99
100 #include <security/mac/mac_framework.h>
101
102 #include <vm/uma.h>
103
104 MALLOC_DECLARE(M_FILECAPS);
105
106 /*
107 * Locking key:
108 * (l) Locked using list lock
109 * (g) Locked using linkage lock
110 */
111
112 static uma_zone_t unp_zone;
113 static unp_gen_t unp_gencnt; /* (l) */
114 static u_int unp_count; /* (l) Count of local sockets. */
115 static ino_t unp_ino; /* Prototype for fake inode numbers. */
116 static int unp_rights; /* (g) File descriptors in flight. */
117 static struct unp_head unp_shead; /* (l) List of stream sockets. */
118 static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
119 static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
120
121 struct unp_defer {
122 SLIST_ENTRY(unp_defer) ud_link;
123 struct file *ud_fp;
124 };
125 static SLIST_HEAD(, unp_defer) unp_defers;
126 static int unp_defers_count;
127
128 static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
129
130 /*
131 * Garbage collection of cyclic file descriptor/socket references occurs
132 * asynchronously in a taskqueue context in order to avoid recursion and
133 * reentrance in the UNIX domain socket, file descriptor, and socket layer
134 * code. See unp_gc() for a full description.
135 */
136 static struct timeout_task unp_gc_task;
137
138 /*
139 * The close of unix domain sockets attached as SCM_RIGHTS is
140 * postponed to the taskqueue, to avoid arbitrary recursion depth.
141 * The attached sockets might have another sockets attached.
142 */
143 static struct task unp_defer_task;
144
145 /*
146 * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
147 * stream sockets, although the total for sender and receiver is actually
148 * only PIPSIZ.
149 *
150 * Datagram sockets really use the sendspace as the maximum datagram size,
151 * and don't really want to reserve the sendspace. Their recvspace should be
152 * large enough for at least one max-size datagram plus address.
153 */
154 #ifndef PIPSIZ
155 #define PIPSIZ 8192
156 #endif
157 static u_long unpst_sendspace = PIPSIZ;
158 static u_long unpst_recvspace = PIPSIZ;
159 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
160 static u_long unpdg_recvspace = 4*1024;
161 static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
162 static u_long unpsp_recvspace = PIPSIZ;
163
164 static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
165 static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
166 "SOCK_STREAM");
167 static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
168 static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
169 "SOCK_SEQPACKET");
170
171 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
172 &unpst_sendspace, 0, "Default stream send space.");
173 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
174 &unpst_recvspace, 0, "Default stream receive space.");
175 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
176 &unpdg_sendspace, 0, "Default datagram send space.");
177 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
178 &unpdg_recvspace, 0, "Default datagram receive space.");
179 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
180 &unpsp_sendspace, 0, "Default seqpacket send space.");
181 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
182 &unpsp_recvspace, 0, "Default seqpacket receive space.");
183 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
184 "File descriptors in flight.");
185 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
186 &unp_defers_count, 0,
187 "File descriptors deferred to taskqueue for close.");
188
189 /*
190 * Locking and synchronization:
191 *
192 * Three types of locks exit in the local domain socket implementation: a
193 * global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the
194 * global locks, the list lock protects the socket count, global generation
195 * number, and stream/datagram global lists. The linkage lock protects the
196 * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
197 * held exclusively over the acquisition of multiple unpcb locks to prevent
198 * deadlock.
199 *
200 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
201 * allocated in pru_attach() and freed in pru_detach(). The validity of that
202 * pointer is an invariant, so no lock is required to dereference the so_pcb
203 * pointer if a valid socket reference is held by the caller. In practice,
204 * this is always true during operations performed on a socket. Each unpcb
205 * has a back-pointer to its socket, unp_socket, which will be stable under
206 * the same circumstances.
207 *
208 * This pointer may only be safely dereferenced as long as a valid reference
209 * to the unpcb is held. Typically, this reference will be from the socket,
210 * or from another unpcb when the referring unpcb's lock is held (in order
211 * that the reference not be invalidated during use). For example, to follow
212 * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
213 * as unp_socket remains valid as long as the reference to unp_conn is valid.
214 *
215 * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
216 * atomic reads without the lock may be performed "lockless", but more
217 * complex reads and read-modify-writes require the mutex to be held. No
218 * lock order is defined between unpcb locks -- multiple unpcb locks may be
219 * acquired at the same time only when holding the linkage rwlock
220 * exclusively, which prevents deadlocks.
221 *
222 * Blocking with UNIX domain sockets is a tricky issue: unlike most network
223 * protocols, bind() is a non-atomic operation, and connect() requires
224 * potential sleeping in the protocol, due to potentially waiting on local or
225 * distributed file systems. We try to separate "lookup" operations, which
226 * may sleep, and the IPC operations themselves, which typically can occur
227 * with relative atomicity as locks can be held over the entire operation.
228 *
229 * Another tricky issue is simultaneous multi-threaded or multi-process
230 * access to a single UNIX domain socket. These are handled by the flags
231 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
232 * binding, both of which involve dropping UNIX domain socket locks in order
233 * to perform namei() and other file system operations.
234 */
235 static struct rwlock unp_link_rwlock;
236 static struct mtx unp_list_lock;
237 static struct mtx unp_defers_lock;
238
239 #define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
240 "unp_link_rwlock")
241
242 #define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
243 RA_LOCKED)
244 #define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
245 RA_UNLOCKED)
246
247 #define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
248 #define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
249 #define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
250 #define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
251 #define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
252 RA_WLOCKED)
253
254 #define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \
255 "unp_list_lock", NULL, MTX_DEF)
256 #define UNP_LIST_LOCK() mtx_lock(&unp_list_lock)
257 #define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock)
258
259 #define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
260 "unp_defer", NULL, MTX_DEF)
261 #define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
262 #define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
263
264 #define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
265 "unp_mtx", "unp_mtx", \
266 MTX_DUPOK|MTX_DEF|MTX_RECURSE)
267 #define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
268 #define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
269 #define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
270 #define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
271
272 static int uipc_connect2(struct socket *, struct socket *);
273 static int uipc_ctloutput(struct socket *, struct sockopt *);
274 static int unp_connect(struct socket *, struct sockaddr *,
275 struct thread *);
276 static int unp_connectat(int, struct socket *, struct sockaddr *,
277 struct thread *);
278 static int unp_connect2(struct socket *so, struct socket *so2, int);
279 static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
280 static void unp_dispose(struct mbuf *);
281 static void unp_dispose_so(struct socket *so);
282 static void unp_shutdown(struct unpcb *);
283 static void unp_drop(struct unpcb *);
284 static void unp_gc(__unused void *, int);
285 static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
286 static void unp_discard(struct file *);
287 static void unp_freerights(struct filedescent **, int);
288 static void unp_init(void);
289 static int unp_internalize(struct mbuf **, struct thread *);
290 static void unp_internalize_fp(struct file *);
291 static int unp_externalize(struct mbuf *, struct mbuf **, int);
292 static int unp_externalize_fp(struct file *);
293 static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
294 static void unp_process_defers(void * __unused, int);
295
296 /*
297 * Definitions of protocols supported in the LOCAL domain.
298 */
299 static struct domain localdomain;
300 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
301 static struct pr_usrreqs uipc_usrreqs_seqpacket;
302 static struct protosw localsw[] = {
303 {
304 .pr_type = SOCK_STREAM,
305 .pr_domain = &localdomain,
306 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
307 .pr_ctloutput = &uipc_ctloutput,
308 .pr_usrreqs = &uipc_usrreqs_stream
309 },
310 {
311 .pr_type = SOCK_DGRAM,
312 .pr_domain = &localdomain,
313 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
314 .pr_ctloutput = &uipc_ctloutput,
315 .pr_usrreqs = &uipc_usrreqs_dgram
316 },
317 {
318 .pr_type = SOCK_SEQPACKET,
319 .pr_domain = &localdomain,
320
321 /*
322 * XXXRW: For now, PR_ADDR because soreceive will bump into them
323 * due to our use of sbappendaddr. A new sbappend variants is needed
324 * that supports both atomic record writes and control data.
325 */
326 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
327 PR_RIGHTS,
328 .pr_ctloutput = &uipc_ctloutput,
329 .pr_usrreqs = &uipc_usrreqs_seqpacket,
330 },
331 };
332
333 static struct domain localdomain = {
334 .dom_family = AF_LOCAL,
335 .dom_name = "local",
336 .dom_init = unp_init,
337 .dom_externalize = unp_externalize,
338 .dom_dispose = unp_dispose_so,
339 .dom_protosw = localsw,
340 .dom_protoswNPROTOSW = &localsw[nitems(localsw)]
341 };
342 DOMAIN_SET(local);
343
344 static void
345 uipc_abort(struct socket *so)
346 {
347 struct unpcb *unp, *unp2;
348
349 unp = sotounpcb(so);
350 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
351
352 UNP_LINK_WLOCK();
353 UNP_PCB_LOCK(unp);
354 unp2 = unp->unp_conn;
355 if (unp2 != NULL) {
356 UNP_PCB_LOCK(unp2);
357 unp_drop(unp2);
358 UNP_PCB_UNLOCK(unp2);
359 }
360 UNP_PCB_UNLOCK(unp);
361 UNP_LINK_WUNLOCK();
362 }
363
364 static int
365 uipc_accept(struct socket *so, struct sockaddr **nam)
366 {
367 struct unpcb *unp, *unp2;
368 const struct sockaddr *sa;
369
370 /*
371 * Pass back name of connected socket, if it was bound and we are
372 * still connected (our peer may have closed already!).
373 */
374 unp = sotounpcb(so);
375 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
376
377 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
378 UNP_LINK_RLOCK();
379 unp2 = unp->unp_conn;
380 if (unp2 != NULL && unp2->unp_addr != NULL) {
381 UNP_PCB_LOCK(unp2);
382 sa = (struct sockaddr *) unp2->unp_addr;
383 bcopy(sa, *nam, sa->sa_len);
384 UNP_PCB_UNLOCK(unp2);
385 } else {
386 sa = &sun_noname;
387 bcopy(sa, *nam, sa->sa_len);
388 }
389 UNP_LINK_RUNLOCK();
390 return (0);
391 }
392
393 static int
394 uipc_attach(struct socket *so, int proto, struct thread *td)
395 {
396 u_long sendspace, recvspace;
397 struct unpcb *unp;
398 int error;
399
400 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
401 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
402 switch (so->so_type) {
403 case SOCK_STREAM:
404 sendspace = unpst_sendspace;
405 recvspace = unpst_recvspace;
406 break;
407
408 case SOCK_DGRAM:
409 sendspace = unpdg_sendspace;
410 recvspace = unpdg_recvspace;
411 break;
412
413 case SOCK_SEQPACKET:
414 sendspace = unpsp_sendspace;
415 recvspace = unpsp_recvspace;
416 break;
417
418 default:
419 panic("uipc_attach");
420 }
421 error = soreserve(so, sendspace, recvspace);
422 if (error)
423 return (error);
424 }
425 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
426 if (unp == NULL)
427 return (ENOBUFS);
428 LIST_INIT(&unp->unp_refs);
429 UNP_PCB_LOCK_INIT(unp);
430 unp->unp_socket = so;
431 so->so_pcb = unp;
432 unp->unp_refcount = 1;
433 if (so->so_head != NULL)
434 unp->unp_flags |= UNP_NASCENT;
435
436 UNP_LIST_LOCK();
437 unp->unp_gencnt = ++unp_gencnt;
438 unp_count++;
439 switch (so->so_type) {
440 case SOCK_STREAM:
441 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
442 break;
443
444 case SOCK_DGRAM:
445 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
446 break;
447
448 case SOCK_SEQPACKET:
449 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
450 break;
451
452 default:
453 panic("uipc_attach");
454 }
455 UNP_LIST_UNLOCK();
456
457 return (0);
458 }
459
460 static int
461 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
462 {
463 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
464 struct vattr vattr;
465 int error, namelen;
466 struct nameidata nd;
467 struct unpcb *unp;
468 struct vnode *vp;
469 struct mount *mp;
470 cap_rights_t rights;
471 char *buf;
472
473 if (nam->sa_family != AF_UNIX)
474 return (EAFNOSUPPORT);
475
476 unp = sotounpcb(so);
477 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
478
479 if (soun->sun_len > sizeof(struct sockaddr_un))
480 return (EINVAL);
481 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
482 if (namelen <= 0)
483 return (EINVAL);
484
485 /*
486 * We don't allow simultaneous bind() calls on a single UNIX domain
487 * socket, so flag in-progress operations, and return an error if an
488 * operation is already in progress.
489 *
490 * Historically, we have not allowed a socket to be rebound, so this
491 * also returns an error. Not allowing re-binding simplifies the
492 * implementation and avoids a great many possible failure modes.
493 */
494 UNP_PCB_LOCK(unp);
495 if (unp->unp_vnode != NULL) {
496 UNP_PCB_UNLOCK(unp);
497 return (EINVAL);
498 }
499 if (unp->unp_flags & UNP_BINDING) {
500 UNP_PCB_UNLOCK(unp);
501 return (EALREADY);
502 }
503 unp->unp_flags |= UNP_BINDING;
504 UNP_PCB_UNLOCK(unp);
505
506 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
507 bcopy(soun->sun_path, buf, namelen);
508 buf[namelen] = 0;
509
510 restart:
511 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE,
512 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td);
513 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
514 error = namei(&nd);
515 if (error)
516 goto error;
517 vp = nd.ni_vp;
518 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
519 NDFREE(&nd, NDF_ONLY_PNBUF);
520 if (nd.ni_dvp == vp)
521 vrele(nd.ni_dvp);
522 else
523 vput(nd.ni_dvp);
524 if (vp != NULL) {
525 vrele(vp);
526 error = EADDRINUSE;
527 goto error;
528 }
529 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
530 if (error)
531 goto error;
532 goto restart;
533 }
534 VATTR_NULL(&vattr);
535 vattr.va_type = VSOCK;
536 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
537 #ifdef MAC
538 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
539 &vattr);
540 #endif
541 if (error == 0)
542 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
543 NDFREE(&nd, NDF_ONLY_PNBUF);
544 vput(nd.ni_dvp);
545 if (error) {
546 vn_finished_write(mp);
547 goto error;
548 }
549 vp = nd.ni_vp;
550 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
551 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
552
553 UNP_LINK_WLOCK();
554 UNP_PCB_LOCK(unp);
555 VOP_UNP_BIND(vp, unp->unp_socket);
556 unp->unp_vnode = vp;
557 unp->unp_addr = soun;
558 unp->unp_flags &= ~UNP_BINDING;
559 UNP_PCB_UNLOCK(unp);
560 UNP_LINK_WUNLOCK();
561 VOP_UNLOCK(vp, 0);
562 vn_finished_write(mp);
563 free(buf, M_TEMP);
564 return (0);
565
566 error:
567 UNP_PCB_LOCK(unp);
568 unp->unp_flags &= ~UNP_BINDING;
569 UNP_PCB_UNLOCK(unp);
570 free(buf, M_TEMP);
571 return (error);
572 }
573
574 static int
575 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
576 {
577
578 return (uipc_bindat(AT_FDCWD, so, nam, td));
579 }
580
581 static int
582 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
583 {
584 int error;
585
586 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
587 UNP_LINK_WLOCK();
588 error = unp_connect(so, nam, td);
589 UNP_LINK_WUNLOCK();
590 return (error);
591 }
592
593 static int
594 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
595 struct thread *td)
596 {
597 int error;
598
599 KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
600 UNP_LINK_WLOCK();
601 error = unp_connectat(fd, so, nam, td);
602 UNP_LINK_WUNLOCK();
603 return (error);
604 }
605
606 static void
607 uipc_close(struct socket *so)
608 {
609 struct unpcb *unp, *unp2;
610
611 unp = sotounpcb(so);
612 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
613
614 UNP_LINK_WLOCK();
615 UNP_PCB_LOCK(unp);
616 unp2 = unp->unp_conn;
617 if (unp2 != NULL) {
618 UNP_PCB_LOCK(unp2);
619 unp_disconnect(unp, unp2);
620 UNP_PCB_UNLOCK(unp2);
621 }
622 UNP_PCB_UNLOCK(unp);
623 UNP_LINK_WUNLOCK();
624 }
625
626 static int
627 uipc_connect2(struct socket *so1, struct socket *so2)
628 {
629 struct unpcb *unp, *unp2;
630 int error;
631
632 UNP_LINK_WLOCK();
633 unp = so1->so_pcb;
634 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
635 UNP_PCB_LOCK(unp);
636 unp2 = so2->so_pcb;
637 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
638 UNP_PCB_LOCK(unp2);
639 error = unp_connect2(so1, so2, PRU_CONNECT2);
640 UNP_PCB_UNLOCK(unp2);
641 UNP_PCB_UNLOCK(unp);
642 UNP_LINK_WUNLOCK();
643 return (error);
644 }
645
646 static void
647 uipc_detach(struct socket *so)
648 {
649 struct unpcb *unp, *unp2;
650 struct sockaddr_un *saved_unp_addr;
651 struct vnode *vp;
652 int freeunp, local_unp_rights;
653
654 unp = sotounpcb(so);
655 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
656
657 vp = NULL;
658 local_unp_rights = 0;
659
660 UNP_LIST_LOCK();
661 LIST_REMOVE(unp, unp_link);
662 unp->unp_gencnt = ++unp_gencnt;
663 --unp_count;
664 UNP_LIST_UNLOCK();
665
666 if ((unp->unp_flags & UNP_NASCENT) != 0) {
667 UNP_PCB_LOCK(unp);
668 goto teardown;
669 }
670 UNP_LINK_WLOCK();
671 UNP_PCB_LOCK(unp);
672
673 /*
674 * XXXRW: Should assert vp->v_socket == so.
675 */
676 if ((vp = unp->unp_vnode) != NULL) {
677 VOP_UNP_DETACH(vp);
678 unp->unp_vnode = NULL;
679 }
680 unp2 = unp->unp_conn;
681 if (unp2 != NULL) {
682 UNP_PCB_LOCK(unp2);
683 unp_disconnect(unp, unp2);
684 UNP_PCB_UNLOCK(unp2);
685 }
686
687 /*
688 * We hold the linkage lock exclusively, so it's OK to acquire
689 * multiple pcb locks at a time.
690 */
691 while (!LIST_EMPTY(&unp->unp_refs)) {
692 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
693
694 UNP_PCB_LOCK(ref);
695 unp_drop(ref);
696 UNP_PCB_UNLOCK(ref);
697 }
698 local_unp_rights = unp_rights;
699 UNP_LINK_WUNLOCK();
700 teardown:
701 unp->unp_socket->so_pcb = NULL;
702 saved_unp_addr = unp->unp_addr;
703 unp->unp_addr = NULL;
704 unp->unp_refcount--;
705 freeunp = (unp->unp_refcount == 0);
706 if (saved_unp_addr != NULL)
707 free(saved_unp_addr, M_SONAME);
708 if (freeunp) {
709 UNP_PCB_LOCK_DESTROY(unp);
710 uma_zfree(unp_zone, unp);
711 } else
712 UNP_PCB_UNLOCK(unp);
713 if (vp)
714 vrele(vp);
715 if (local_unp_rights)
716 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
717 }
718
719 static int
720 uipc_disconnect(struct socket *so)
721 {
722 struct unpcb *unp, *unp2;
723
724 unp = sotounpcb(so);
725 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
726
727 UNP_LINK_WLOCK();
728 UNP_PCB_LOCK(unp);
729 unp2 = unp->unp_conn;
730 if (unp2 != NULL) {
731 UNP_PCB_LOCK(unp2);
732 unp_disconnect(unp, unp2);
733 UNP_PCB_UNLOCK(unp2);
734 }
735 UNP_PCB_UNLOCK(unp);
736 UNP_LINK_WUNLOCK();
737 return (0);
738 }
739
740 static int
741 uipc_listen(struct socket *so, int backlog, struct thread *td)
742 {
743 struct unpcb *unp;
744 int error;
745
746 unp = sotounpcb(so);
747 KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
748
749 UNP_PCB_LOCK(unp);
750 if (unp->unp_vnode == NULL) {
751 /* Already connected or not bound to an address. */
752 error = unp->unp_conn != NULL ? EINVAL : EDESTADDRREQ;
753 UNP_PCB_UNLOCK(unp);
754 return (error);
755 }
756
757 SOCK_LOCK(so);
758 error = solisten_proto_check(so);
759 if (error == 0) {
760 cru2x(td->td_ucred, &unp->unp_peercred);
761 unp->unp_flags |= UNP_HAVEPCCACHED;
762 solisten_proto(so, backlog);
763 }
764 SOCK_UNLOCK(so);
765 UNP_PCB_UNLOCK(unp);
766 return (error);
767 }
768
769 static int
770 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
771 {
772 struct unpcb *unp, *unp2;
773 const struct sockaddr *sa;
774
775 unp = sotounpcb(so);
776 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
777
778 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
779 UNP_LINK_RLOCK();
780 /*
781 * XXX: It seems that this test always fails even when connection is
782 * established. So, this else clause is added as workaround to
783 * return PF_LOCAL sockaddr.
784 */
785 unp2 = unp->unp_conn;
786 if (unp2 != NULL) {
787 UNP_PCB_LOCK(unp2);
788 if (unp2->unp_addr != NULL)
789 sa = (struct sockaddr *) unp2->unp_addr;
790 else
791 sa = &sun_noname;
792 bcopy(sa, *nam, sa->sa_len);
793 UNP_PCB_UNLOCK(unp2);
794 } else {
795 sa = &sun_noname;
796 bcopy(sa, *nam, sa->sa_len);
797 }
798 UNP_LINK_RUNLOCK();
799 return (0);
800 }
801
802 static int
803 uipc_rcvd(struct socket *so, int flags)
804 {
805 struct unpcb *unp, *unp2;
806 struct socket *so2;
807 u_int mbcnt, sbcc;
808
809 unp = sotounpcb(so);
810 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
811 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
812 ("%s: socktype %d", __func__, so->so_type));
813
814 /*
815 * Adjust backpressure on sender and wakeup any waiting to write.
816 *
817 * The unp lock is acquired to maintain the validity of the unp_conn
818 * pointer; no lock on unp2 is required as unp2->unp_socket will be
819 * static as long as we don't permit unp2 to disconnect from unp,
820 * which is prevented by the lock on unp. We cache values from
821 * so_rcv to avoid holding the so_rcv lock over the entire
822 * transaction on the remote so_snd.
823 */
824 SOCKBUF_LOCK(&so->so_rcv);
825 mbcnt = so->so_rcv.sb_mbcnt;
826 sbcc = sbavail(&so->so_rcv);
827 SOCKBUF_UNLOCK(&so->so_rcv);
828 /*
829 * There is a benign race condition at this point. If we're planning to
830 * clear SB_STOP, but uipc_send is called on the connected socket at
831 * this instant, it might add data to the sockbuf and set SB_STOP. Then
832 * we would erroneously clear SB_STOP below, even though the sockbuf is
833 * full. The race is benign because the only ill effect is to allow the
834 * sockbuf to exceed its size limit, and the size limits are not
835 * strictly guaranteed anyway.
836 */
837 UNP_PCB_LOCK(unp);
838 unp2 = unp->unp_conn;
839 if (unp2 == NULL) {
840 UNP_PCB_UNLOCK(unp);
841 return (0);
842 }
843 so2 = unp2->unp_socket;
844 SOCKBUF_LOCK(&so2->so_snd);
845 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
846 so2->so_snd.sb_flags &= ~SB_STOP;
847 sowwakeup_locked(so2);
848 UNP_PCB_UNLOCK(unp);
849 return (0);
850 }
851
852 static int
853 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
854 struct mbuf *control, struct thread *td)
855 {
856 struct unpcb *unp, *unp2;
857 struct socket *so2;
858 u_int mbcnt, sbcc;
859 int error = 0;
860
861 unp = sotounpcb(so);
862 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
863 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_DGRAM ||
864 so->so_type == SOCK_SEQPACKET,
865 ("%s: socktype %d", __func__, so->so_type));
866
867 if (flags & PRUS_OOB) {
868 error = EOPNOTSUPP;
869 goto release;
870 }
871 if (control != NULL && (error = unp_internalize(&control, td)))
872 goto release;
873 if ((nam != NULL) || (flags & PRUS_EOF))
874 UNP_LINK_WLOCK();
875 else
876 UNP_LINK_RLOCK();
877 switch (so->so_type) {
878 case SOCK_DGRAM:
879 {
880 const struct sockaddr *from;
881
882 unp2 = unp->unp_conn;
883 if (nam != NULL) {
884 UNP_LINK_WLOCK_ASSERT();
885 if (unp2 != NULL) {
886 error = EISCONN;
887 break;
888 }
889 error = unp_connect(so, nam, td);
890 if (error)
891 break;
892 unp2 = unp->unp_conn;
893 }
894
895 /*
896 * Because connect() and send() are non-atomic in a sendto()
897 * with a target address, it's possible that the socket will
898 * have disconnected before the send() can run. In that case
899 * return the slightly counter-intuitive but otherwise
900 * correct error that the socket is not connected.
901 */
902 if (unp2 == NULL) {
903 error = ENOTCONN;
904 break;
905 }
906 /* Lockless read. */
907 if (unp2->unp_flags & UNP_WANTCRED)
908 control = unp_addsockcred(td, control);
909 UNP_PCB_LOCK(unp);
910 if (unp->unp_addr != NULL)
911 from = (struct sockaddr *)unp->unp_addr;
912 else
913 from = &sun_noname;
914 so2 = unp2->unp_socket;
915 SOCKBUF_LOCK(&so2->so_rcv);
916 if (sbappendaddr_locked(&so2->so_rcv, from, m,
917 control)) {
918 sorwakeup_locked(so2);
919 m = NULL;
920 control = NULL;
921 } else {
922 SOCKBUF_UNLOCK(&so2->so_rcv);
923 error = ENOBUFS;
924 }
925 if (nam != NULL) {
926 UNP_LINK_WLOCK_ASSERT();
927 UNP_PCB_LOCK(unp2);
928 unp_disconnect(unp, unp2);
929 UNP_PCB_UNLOCK(unp2);
930 }
931 UNP_PCB_UNLOCK(unp);
932 break;
933 }
934
935 case SOCK_SEQPACKET:
936 case SOCK_STREAM:
937 if ((so->so_state & SS_ISCONNECTED) == 0) {
938 if (nam != NULL) {
939 UNP_LINK_WLOCK_ASSERT();
940 error = unp_connect(so, nam, td);
941 if (error)
942 break; /* XXX */
943 } else {
944 error = ENOTCONN;
945 break;
946 }
947 }
948
949 /* Lockless read. */
950 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
951 error = EPIPE;
952 break;
953 }
954
955 /*
956 * Because connect() and send() are non-atomic in a sendto()
957 * with a target address, it's possible that the socket will
958 * have disconnected before the send() can run. In that case
959 * return the slightly counter-intuitive but otherwise
960 * correct error that the socket is not connected.
961 *
962 * Locking here must be done carefully: the linkage lock
963 * prevents interconnections between unpcbs from changing, so
964 * we can traverse from unp to unp2 without acquiring unp's
965 * lock. Socket buffer locks follow unpcb locks, so we can
966 * acquire both remote and lock socket buffer locks.
967 */
968 unp2 = unp->unp_conn;
969 if (unp2 == NULL) {
970 error = ENOTCONN;
971 break;
972 }
973 so2 = unp2->unp_socket;
974 UNP_PCB_LOCK(unp2);
975 SOCKBUF_LOCK(&so2->so_rcv);
976 if (unp2->unp_flags & UNP_WANTCRED) {
977 /*
978 * Credentials are passed only once on SOCK_STREAM
979 * and SOCK_SEQPACKET.
980 */
981 unp2->unp_flags &= ~UNP_WANTCRED;
982 control = unp_addsockcred(td, control);
983 }
984 /*
985 * Send to paired receive port, and then reduce send buffer
986 * hiwater marks to maintain backpressure. Wake up readers.
987 */
988 switch (so->so_type) {
989 case SOCK_STREAM:
990 if (control != NULL) {
991 if (sbappendcontrol_locked(&so2->so_rcv, m,
992 control))
993 control = NULL;
994 } else
995 sbappend_locked(&so2->so_rcv, m, flags);
996 break;
997
998 case SOCK_SEQPACKET: {
999 const struct sockaddr *from;
1000
1001 from = &sun_noname;
1002 /*
1003 * Don't check for space available in so2->so_rcv.
1004 * Unix domain sockets only check for space in the
1005 * sending sockbuf, and that check is performed one
1006 * level up the stack.
1007 */
1008 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
1009 from, m, control))
1010 control = NULL;
1011 break;
1012 }
1013 }
1014
1015 mbcnt = so2->so_rcv.sb_mbcnt;
1016 sbcc = sbavail(&so2->so_rcv);
1017 if (sbcc)
1018 sorwakeup_locked(so2);
1019 else
1020 SOCKBUF_UNLOCK(&so2->so_rcv);
1021
1022 /*
1023 * The PCB lock on unp2 protects the SB_STOP flag. Without it,
1024 * it would be possible for uipc_rcvd to be called at this
1025 * point, drain the receiving sockbuf, clear SB_STOP, and then
1026 * we would set SB_STOP below. That could lead to an empty
1027 * sockbuf having SB_STOP set
1028 */
1029 SOCKBUF_LOCK(&so->so_snd);
1030 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1031 so->so_snd.sb_flags |= SB_STOP;
1032 SOCKBUF_UNLOCK(&so->so_snd);
1033 UNP_PCB_UNLOCK(unp2);
1034 m = NULL;
1035 break;
1036 }
1037
1038 /*
1039 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1040 */
1041 if (flags & PRUS_EOF) {
1042 UNP_PCB_LOCK(unp);
1043 socantsendmore(so);
1044 unp_shutdown(unp);
1045 UNP_PCB_UNLOCK(unp);
1046 }
1047
1048 if ((nam != NULL) || (flags & PRUS_EOF))
1049 UNP_LINK_WUNLOCK();
1050 else
1051 UNP_LINK_RUNLOCK();
1052
1053 if (control != NULL && error != 0)
1054 unp_dispose(control);
1055
1056 release:
1057 if (control != NULL)
1058 m_freem(control);
1059 if (m != NULL)
1060 m_freem(m);
1061 return (error);
1062 }
1063
1064 static int
1065 uipc_ready(struct socket *so, struct mbuf *m, int count)
1066 {
1067 struct unpcb *unp, *unp2;
1068 struct socket *so2;
1069 int error;
1070
1071 unp = sotounpcb(so);
1072
1073 UNP_LINK_RLOCK();
1074 unp2 = unp->unp_conn;
1075 UNP_PCB_LOCK(unp2);
1076 so2 = unp2->unp_socket;
1077
1078 SOCKBUF_LOCK(&so2->so_rcv);
1079 if ((error = sbready(&so2->so_rcv, m, count)) == 0)
1080 sorwakeup_locked(so2);
1081 else
1082 SOCKBUF_UNLOCK(&so2->so_rcv);
1083
1084 UNP_PCB_UNLOCK(unp2);
1085 UNP_LINK_RUNLOCK();
1086
1087 return (error);
1088 }
1089
1090 static int
1091 uipc_sense(struct socket *so, struct stat *sb)
1092 {
1093 struct unpcb *unp;
1094
1095 unp = sotounpcb(so);
1096 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1097
1098 sb->st_blksize = so->so_snd.sb_hiwat;
1099 UNP_PCB_LOCK(unp);
1100 sb->st_dev = NODEV;
1101 if (unp->unp_ino == 0)
1102 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1103 sb->st_ino = unp->unp_ino;
1104 UNP_PCB_UNLOCK(unp);
1105 return (0);
1106 }
1107
1108 static int
1109 uipc_shutdown(struct socket *so)
1110 {
1111 struct unpcb *unp;
1112
1113 unp = sotounpcb(so);
1114 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1115
1116 UNP_LINK_WLOCK();
1117 UNP_PCB_LOCK(unp);
1118 socantsendmore(so);
1119 unp_shutdown(unp);
1120 UNP_PCB_UNLOCK(unp);
1121 UNP_LINK_WUNLOCK();
1122 return (0);
1123 }
1124
1125 static int
1126 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1127 {
1128 struct unpcb *unp;
1129 const struct sockaddr *sa;
1130
1131 unp = sotounpcb(so);
1132 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1133
1134 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1135 UNP_PCB_LOCK(unp);
1136 if (unp->unp_addr != NULL)
1137 sa = (struct sockaddr *) unp->unp_addr;
1138 else
1139 sa = &sun_noname;
1140 bcopy(sa, *nam, sa->sa_len);
1141 UNP_PCB_UNLOCK(unp);
1142 return (0);
1143 }
1144
1145 static struct pr_usrreqs uipc_usrreqs_dgram = {
1146 .pru_abort = uipc_abort,
1147 .pru_accept = uipc_accept,
1148 .pru_attach = uipc_attach,
1149 .pru_bind = uipc_bind,
1150 .pru_bindat = uipc_bindat,
1151 .pru_connect = uipc_connect,
1152 .pru_connectat = uipc_connectat,
1153 .pru_connect2 = uipc_connect2,
1154 .pru_detach = uipc_detach,
1155 .pru_disconnect = uipc_disconnect,
1156 .pru_listen = uipc_listen,
1157 .pru_peeraddr = uipc_peeraddr,
1158 .pru_rcvd = uipc_rcvd,
1159 .pru_send = uipc_send,
1160 .pru_sense = uipc_sense,
1161 .pru_shutdown = uipc_shutdown,
1162 .pru_sockaddr = uipc_sockaddr,
1163 .pru_soreceive = soreceive_dgram,
1164 .pru_close = uipc_close,
1165 };
1166
1167 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1168 .pru_abort = uipc_abort,
1169 .pru_accept = uipc_accept,
1170 .pru_attach = uipc_attach,
1171 .pru_bind = uipc_bind,
1172 .pru_bindat = uipc_bindat,
1173 .pru_connect = uipc_connect,
1174 .pru_connectat = uipc_connectat,
1175 .pru_connect2 = uipc_connect2,
1176 .pru_detach = uipc_detach,
1177 .pru_disconnect = uipc_disconnect,
1178 .pru_listen = uipc_listen,
1179 .pru_peeraddr = uipc_peeraddr,
1180 .pru_rcvd = uipc_rcvd,
1181 .pru_send = uipc_send,
1182 .pru_sense = uipc_sense,
1183 .pru_shutdown = uipc_shutdown,
1184 .pru_sockaddr = uipc_sockaddr,
1185 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1186 .pru_close = uipc_close,
1187 };
1188
1189 static struct pr_usrreqs uipc_usrreqs_stream = {
1190 .pru_abort = uipc_abort,
1191 .pru_accept = uipc_accept,
1192 .pru_attach = uipc_attach,
1193 .pru_bind = uipc_bind,
1194 .pru_bindat = uipc_bindat,
1195 .pru_connect = uipc_connect,
1196 .pru_connectat = uipc_connectat,
1197 .pru_connect2 = uipc_connect2,
1198 .pru_detach = uipc_detach,
1199 .pru_disconnect = uipc_disconnect,
1200 .pru_listen = uipc_listen,
1201 .pru_peeraddr = uipc_peeraddr,
1202 .pru_rcvd = uipc_rcvd,
1203 .pru_send = uipc_send,
1204 .pru_ready = uipc_ready,
1205 .pru_sense = uipc_sense,
1206 .pru_shutdown = uipc_shutdown,
1207 .pru_sockaddr = uipc_sockaddr,
1208 .pru_soreceive = soreceive_generic,
1209 .pru_close = uipc_close,
1210 };
1211
1212 static int
1213 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1214 {
1215 struct unpcb *unp;
1216 struct xucred xu;
1217 int error, optval;
1218
1219 if (sopt->sopt_level != 0)
1220 return (EINVAL);
1221
1222 unp = sotounpcb(so);
1223 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1224 error = 0;
1225 switch (sopt->sopt_dir) {
1226 case SOPT_GET:
1227 switch (sopt->sopt_name) {
1228 case LOCAL_PEERCRED:
1229 UNP_PCB_LOCK(unp);
1230 if (unp->unp_flags & UNP_HAVEPC)
1231 xu = unp->unp_peercred;
1232 else {
1233 if (so->so_type == SOCK_STREAM)
1234 error = ENOTCONN;
1235 else
1236 error = EINVAL;
1237 }
1238 UNP_PCB_UNLOCK(unp);
1239 if (error == 0)
1240 error = sooptcopyout(sopt, &xu, sizeof(xu));
1241 break;
1242
1243 case LOCAL_CREDS:
1244 /* Unlocked read. */
1245 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1246 error = sooptcopyout(sopt, &optval, sizeof(optval));
1247 break;
1248
1249 case LOCAL_CONNWAIT:
1250 /* Unlocked read. */
1251 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1252 error = sooptcopyout(sopt, &optval, sizeof(optval));
1253 break;
1254
1255 default:
1256 error = EOPNOTSUPP;
1257 break;
1258 }
1259 break;
1260
1261 case SOPT_SET:
1262 switch (sopt->sopt_name) {
1263 case LOCAL_CREDS:
1264 case LOCAL_CONNWAIT:
1265 error = sooptcopyin(sopt, &optval, sizeof(optval),
1266 sizeof(optval));
1267 if (error)
1268 break;
1269
1270 #define OPTSET(bit) do { \
1271 UNP_PCB_LOCK(unp); \
1272 if (optval) \
1273 unp->unp_flags |= bit; \
1274 else \
1275 unp->unp_flags &= ~bit; \
1276 UNP_PCB_UNLOCK(unp); \
1277 } while (0)
1278
1279 switch (sopt->sopt_name) {
1280 case LOCAL_CREDS:
1281 OPTSET(UNP_WANTCRED);
1282 break;
1283
1284 case LOCAL_CONNWAIT:
1285 OPTSET(UNP_CONNWAIT);
1286 break;
1287
1288 default:
1289 break;
1290 }
1291 break;
1292 #undef OPTSET
1293 default:
1294 error = ENOPROTOOPT;
1295 break;
1296 }
1297 break;
1298
1299 default:
1300 error = EOPNOTSUPP;
1301 break;
1302 }
1303 return (error);
1304 }
1305
1306 static int
1307 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1308 {
1309
1310 return (unp_connectat(AT_FDCWD, so, nam, td));
1311 }
1312
1313 static int
1314 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1315 struct thread *td)
1316 {
1317 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1318 struct vnode *vp;
1319 struct socket *so2, *so3;
1320 struct unpcb *unp, *unp2, *unp3;
1321 struct nameidata nd;
1322 char buf[SOCK_MAXADDRLEN];
1323 struct sockaddr *sa;
1324 cap_rights_t rights;
1325 int error, len;
1326
1327 if (nam->sa_family != AF_UNIX)
1328 return (EAFNOSUPPORT);
1329
1330 UNP_LINK_WLOCK_ASSERT();
1331
1332 unp = sotounpcb(so);
1333 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1334
1335 if (nam->sa_len > sizeof(struct sockaddr_un))
1336 return (EINVAL);
1337 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1338 if (len <= 0)
1339 return (EINVAL);
1340 bcopy(soun->sun_path, buf, len);
1341 buf[len] = 0;
1342
1343 UNP_PCB_LOCK(unp);
1344 if (unp->unp_flags & UNP_CONNECTING) {
1345 UNP_PCB_UNLOCK(unp);
1346 return (EALREADY);
1347 }
1348 UNP_LINK_WUNLOCK();
1349 unp->unp_flags |= UNP_CONNECTING;
1350 UNP_PCB_UNLOCK(unp);
1351
1352 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1353 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1354 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1355 error = namei(&nd);
1356 if (error)
1357 vp = NULL;
1358 else
1359 vp = nd.ni_vp;
1360 ASSERT_VOP_LOCKED(vp, "unp_connect");
1361 NDFREE(&nd, NDF_ONLY_PNBUF);
1362 if (error)
1363 goto bad;
1364
1365 if (vp->v_type != VSOCK) {
1366 error = ENOTSOCK;
1367 goto bad;
1368 }
1369 #ifdef MAC
1370 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1371 if (error)
1372 goto bad;
1373 #endif
1374 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1375 if (error)
1376 goto bad;
1377
1378 unp = sotounpcb(so);
1379 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1380
1381 /*
1382 * Lock linkage lock for two reasons: make sure v_socket is stable,
1383 * and to protect simultaneous locking of multiple pcbs.
1384 */
1385 UNP_LINK_WLOCK();
1386 VOP_UNP_CONNECT(vp, &so2);
1387 if (so2 == NULL) {
1388 error = ECONNREFUSED;
1389 goto bad2;
1390 }
1391 if (so->so_type != so2->so_type) {
1392 error = EPROTOTYPE;
1393 goto bad2;
1394 }
1395 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1396 if (so2->so_options & SO_ACCEPTCONN) {
1397 CURVNET_SET(so2->so_vnet);
1398 so3 = sonewconn(so2, 0);
1399 CURVNET_RESTORE();
1400 } else
1401 so3 = NULL;
1402 if (so3 == NULL) {
1403 error = ECONNREFUSED;
1404 goto bad2;
1405 }
1406 unp = sotounpcb(so);
1407 unp2 = sotounpcb(so2);
1408 unp3 = sotounpcb(so3);
1409 UNP_PCB_LOCK(unp);
1410 UNP_PCB_LOCK(unp2);
1411 UNP_PCB_LOCK(unp3);
1412 if (unp2->unp_addr != NULL) {
1413 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1414 unp3->unp_addr = (struct sockaddr_un *) sa;
1415 sa = NULL;
1416 }
1417
1418 /*
1419 * The connector's (client's) credentials are copied from its
1420 * process structure at the time of connect() (which is now).
1421 */
1422 cru2x(td->td_ucred, &unp3->unp_peercred);
1423 unp3->unp_flags |= UNP_HAVEPC;
1424
1425 /*
1426 * The receiver's (server's) credentials are copied from the
1427 * unp_peercred member of socket on which the former called
1428 * listen(); uipc_listen() cached that process's credentials
1429 * at that time so we can use them now.
1430 */
1431 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1432 ("unp_connect: listener without cached peercred"));
1433 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1434 sizeof(unp->unp_peercred));
1435 unp->unp_flags |= UNP_HAVEPC;
1436 if (unp2->unp_flags & UNP_WANTCRED)
1437 unp3->unp_flags |= UNP_WANTCRED;
1438 UNP_PCB_UNLOCK(unp3);
1439 UNP_PCB_UNLOCK(unp2);
1440 UNP_PCB_UNLOCK(unp);
1441 #ifdef MAC
1442 mac_socketpeer_set_from_socket(so, so3);
1443 mac_socketpeer_set_from_socket(so3, so);
1444 #endif
1445
1446 so2 = so3;
1447 }
1448 unp = sotounpcb(so);
1449 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1450 unp2 = sotounpcb(so2);
1451 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1452 UNP_PCB_LOCK(unp);
1453 UNP_PCB_LOCK(unp2);
1454 error = unp_connect2(so, so2, PRU_CONNECT);
1455 UNP_PCB_UNLOCK(unp2);
1456 UNP_PCB_UNLOCK(unp);
1457 bad2:
1458 UNP_LINK_WUNLOCK();
1459 bad:
1460 if (vp != NULL)
1461 vput(vp);
1462 free(sa, M_SONAME);
1463 UNP_LINK_WLOCK();
1464 UNP_PCB_LOCK(unp);
1465 unp->unp_flags &= ~UNP_CONNECTING;
1466 UNP_PCB_UNLOCK(unp);
1467 return (error);
1468 }
1469
1470 static int
1471 unp_connect2(struct socket *so, struct socket *so2, int req)
1472 {
1473 struct unpcb *unp;
1474 struct unpcb *unp2;
1475
1476 unp = sotounpcb(so);
1477 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1478 unp2 = sotounpcb(so2);
1479 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1480
1481 UNP_LINK_WLOCK_ASSERT();
1482 UNP_PCB_LOCK_ASSERT(unp);
1483 UNP_PCB_LOCK_ASSERT(unp2);
1484
1485 if (so2->so_type != so->so_type)
1486 return (EPROTOTYPE);
1487 unp2->unp_flags &= ~UNP_NASCENT;
1488 unp->unp_conn = unp2;
1489
1490 switch (so->so_type) {
1491 case SOCK_DGRAM:
1492 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1493 soisconnected(so);
1494 break;
1495
1496 case SOCK_STREAM:
1497 case SOCK_SEQPACKET:
1498 unp2->unp_conn = unp;
1499 if (req == PRU_CONNECT &&
1500 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1501 soisconnecting(so);
1502 else
1503 soisconnected(so);
1504 soisconnected(so2);
1505 break;
1506
1507 default:
1508 panic("unp_connect2");
1509 }
1510 return (0);
1511 }
1512
1513 static void
1514 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1515 {
1516 struct socket *so;
1517
1518 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1519
1520 UNP_LINK_WLOCK_ASSERT();
1521 UNP_PCB_LOCK_ASSERT(unp);
1522 UNP_PCB_LOCK_ASSERT(unp2);
1523
1524 unp->unp_conn = NULL;
1525 switch (unp->unp_socket->so_type) {
1526 case SOCK_DGRAM:
1527 LIST_REMOVE(unp, unp_reflink);
1528 so = unp->unp_socket;
1529 SOCK_LOCK(so);
1530 so->so_state &= ~SS_ISCONNECTED;
1531 SOCK_UNLOCK(so);
1532 break;
1533
1534 case SOCK_STREAM:
1535 case SOCK_SEQPACKET:
1536 soisdisconnected(unp->unp_socket);
1537 unp2->unp_conn = NULL;
1538 soisdisconnected(unp2->unp_socket);
1539 break;
1540 }
1541 }
1542
1543 /*
1544 * unp_pcblist() walks the global list of struct unpcb's to generate a
1545 * pointer list, bumping the refcount on each unpcb. It then copies them out
1546 * sequentially, validating the generation number on each to see if it has
1547 * been detached. All of this is necessary because copyout() may sleep on
1548 * disk I/O.
1549 */
1550 static int
1551 unp_pcblist(SYSCTL_HANDLER_ARGS)
1552 {
1553 int error, i, n;
1554 int freeunp;
1555 struct unpcb *unp, **unp_list;
1556 unp_gen_t gencnt;
1557 struct xunpgen *xug;
1558 struct unp_head *head;
1559 struct xunpcb *xu;
1560
1561 switch ((intptr_t)arg1) {
1562 case SOCK_STREAM:
1563 head = &unp_shead;
1564 break;
1565
1566 case SOCK_DGRAM:
1567 head = &unp_dhead;
1568 break;
1569
1570 case SOCK_SEQPACKET:
1571 head = &unp_sphead;
1572 break;
1573
1574 default:
1575 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1576 }
1577
1578 /*
1579 * The process of preparing the PCB list is too time-consuming and
1580 * resource-intensive to repeat twice on every request.
1581 */
1582 if (req->oldptr == NULL) {
1583 n = unp_count;
1584 req->oldidx = 2 * (sizeof *xug)
1585 + (n + n/8) * sizeof(struct xunpcb);
1586 return (0);
1587 }
1588
1589 if (req->newptr != NULL)
1590 return (EPERM);
1591
1592 /*
1593 * OK, now we're committed to doing something.
1594 */
1595 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1596 UNP_LIST_LOCK();
1597 gencnt = unp_gencnt;
1598 n = unp_count;
1599 UNP_LIST_UNLOCK();
1600
1601 xug->xug_len = sizeof *xug;
1602 xug->xug_count = n;
1603 xug->xug_gen = gencnt;
1604 xug->xug_sogen = so_gencnt;
1605 error = SYSCTL_OUT(req, xug, sizeof *xug);
1606 if (error) {
1607 free(xug, M_TEMP);
1608 return (error);
1609 }
1610
1611 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1612
1613 UNP_LIST_LOCK();
1614 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1615 unp = LIST_NEXT(unp, unp_link)) {
1616 UNP_PCB_LOCK(unp);
1617 if (unp->unp_gencnt <= gencnt) {
1618 if (cr_cansee(req->td->td_ucred,
1619 unp->unp_socket->so_cred)) {
1620 UNP_PCB_UNLOCK(unp);
1621 continue;
1622 }
1623 unp_list[i++] = unp;
1624 unp->unp_refcount++;
1625 }
1626 UNP_PCB_UNLOCK(unp);
1627 }
1628 UNP_LIST_UNLOCK();
1629 n = i; /* In case we lost some during malloc. */
1630
1631 error = 0;
1632 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1633 for (i = 0; i < n; i++) {
1634 unp = unp_list[i];
1635 UNP_PCB_LOCK(unp);
1636 unp->unp_refcount--;
1637 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1638 xu->xu_len = sizeof *xu;
1639 xu->xu_unpp = unp;
1640 /*
1641 * XXX - need more locking here to protect against
1642 * connect/disconnect races for SMP.
1643 */
1644 if (unp->unp_addr != NULL)
1645 bcopy(unp->unp_addr, &xu->xu_addr,
1646 unp->unp_addr->sun_len);
1647 if (unp->unp_conn != NULL &&
1648 unp->unp_conn->unp_addr != NULL)
1649 bcopy(unp->unp_conn->unp_addr,
1650 &xu->xu_caddr,
1651 unp->unp_conn->unp_addr->sun_len);
1652 bcopy(unp, &xu->xu_unp, sizeof *unp);
1653 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1654 UNP_PCB_UNLOCK(unp);
1655 error = SYSCTL_OUT(req, xu, sizeof *xu);
1656 } else {
1657 freeunp = (unp->unp_refcount == 0);
1658 UNP_PCB_UNLOCK(unp);
1659 if (freeunp) {
1660 UNP_PCB_LOCK_DESTROY(unp);
1661 uma_zfree(unp_zone, unp);
1662 }
1663 }
1664 }
1665 free(xu, M_TEMP);
1666 if (!error) {
1667 /*
1668 * Give the user an updated idea of our state. If the
1669 * generation differs from what we told her before, she knows
1670 * that something happened while we were processing this
1671 * request, and it might be necessary to retry.
1672 */
1673 xug->xug_gen = unp_gencnt;
1674 xug->xug_sogen = so_gencnt;
1675 xug->xug_count = unp_count;
1676 error = SYSCTL_OUT(req, xug, sizeof *xug);
1677 }
1678 free(unp_list, M_TEMP);
1679 free(xug, M_TEMP);
1680 return (error);
1681 }
1682
1683 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1684 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1685 "List of active local datagram sockets");
1686 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1687 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1688 "List of active local stream sockets");
1689 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1690 CTLTYPE_OPAQUE | CTLFLAG_RD,
1691 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1692 "List of active local seqpacket sockets");
1693
1694 static void
1695 unp_shutdown(struct unpcb *unp)
1696 {
1697 struct unpcb *unp2;
1698 struct socket *so;
1699
1700 UNP_LINK_WLOCK_ASSERT();
1701 UNP_PCB_LOCK_ASSERT(unp);
1702
1703 unp2 = unp->unp_conn;
1704 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1705 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1706 so = unp2->unp_socket;
1707 if (so != NULL)
1708 socantrcvmore(so);
1709 }
1710 }
1711
1712 static void
1713 unp_drop(struct unpcb *unp)
1714 {
1715 struct socket *so = unp->unp_socket;
1716 struct unpcb *unp2;
1717
1718 UNP_LINK_WLOCK_ASSERT();
1719 UNP_PCB_LOCK_ASSERT(unp);
1720
1721 /*
1722 * Regardless of whether the socket's peer dropped the connection
1723 * with this socket by aborting or disconnecting, POSIX requires
1724 * that ECONNRESET is returned.
1725 */
1726 so->so_error = ECONNRESET;
1727 unp2 = unp->unp_conn;
1728 if (unp2 == NULL)
1729 return;
1730 UNP_PCB_LOCK(unp2);
1731 unp_disconnect(unp, unp2);
1732 UNP_PCB_UNLOCK(unp2);
1733 }
1734
1735 static void
1736 unp_freerights(struct filedescent **fdep, int fdcount)
1737 {
1738 struct file *fp;
1739 int i;
1740
1741 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1742
1743 for (i = 0; i < fdcount; i++) {
1744 fp = fdep[i]->fde_file;
1745 filecaps_free(&fdep[i]->fde_caps);
1746 unp_discard(fp);
1747 }
1748 free(fdep[0], M_FILECAPS);
1749 }
1750
1751 static int
1752 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1753 {
1754 struct thread *td = curthread; /* XXX */
1755 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1756 int i;
1757 int *fdp;
1758 struct filedesc *fdesc = td->td_proc->p_fd;
1759 struct filedescent **fdep;
1760 void *data;
1761 socklen_t clen = control->m_len, datalen;
1762 int error, newfds;
1763 u_int newlen;
1764
1765 UNP_LINK_UNLOCK_ASSERT();
1766
1767 error = 0;
1768 if (controlp != NULL) /* controlp == NULL => free control messages */
1769 *controlp = NULL;
1770 while (cm != NULL) {
1771 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1772 error = EINVAL;
1773 break;
1774 }
1775 data = CMSG_DATA(cm);
1776 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1777 if (cm->cmsg_level == SOL_SOCKET
1778 && cm->cmsg_type == SCM_RIGHTS) {
1779 newfds = datalen / sizeof(*fdep);
1780 if (newfds == 0)
1781 goto next;
1782 fdep = data;
1783
1784 /* If we're not outputting the descriptors free them. */
1785 if (error || controlp == NULL) {
1786 unp_freerights(fdep, newfds);
1787 goto next;
1788 }
1789 FILEDESC_XLOCK(fdesc);
1790
1791 /*
1792 * Now change each pointer to an fd in the global
1793 * table to an integer that is the index to the local
1794 * fd table entry that we set up to point to the
1795 * global one we are transferring.
1796 */
1797 newlen = newfds * sizeof(int);
1798 *controlp = sbcreatecontrol(NULL, newlen,
1799 SCM_RIGHTS, SOL_SOCKET);
1800 if (*controlp == NULL) {
1801 FILEDESC_XUNLOCK(fdesc);
1802 error = E2BIG;
1803 unp_freerights(fdep, newfds);
1804 goto next;
1805 }
1806
1807 fdp = (int *)
1808 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1809 if (fdallocn(td, 0, fdp, newfds) != 0) {
1810 FILEDESC_XUNLOCK(fdesc);
1811 error = EMSGSIZE;
1812 unp_freerights(fdep, newfds);
1813 m_freem(*controlp);
1814 *controlp = NULL;
1815 goto next;
1816 }
1817 for (i = 0; i < newfds; i++, fdp++) {
1818 _finstall(fdesc, fdep[i]->fde_file, *fdp,
1819 (flags & MSG_CMSG_CLOEXEC) != 0 ? UF_EXCLOSE : 0,
1820 &fdep[i]->fde_caps);
1821 unp_externalize_fp(fdep[i]->fde_file);
1822 }
1823 FILEDESC_XUNLOCK(fdesc);
1824 free(fdep[0], M_FILECAPS);
1825 } else {
1826 /* We can just copy anything else across. */
1827 if (error || controlp == NULL)
1828 goto next;
1829 *controlp = sbcreatecontrol(NULL, datalen,
1830 cm->cmsg_type, cm->cmsg_level);
1831 if (*controlp == NULL) {
1832 error = ENOBUFS;
1833 goto next;
1834 }
1835 bcopy(data,
1836 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1837 datalen);
1838 }
1839 controlp = &(*controlp)->m_next;
1840
1841 next:
1842 if (CMSG_SPACE(datalen) < clen) {
1843 clen -= CMSG_SPACE(datalen);
1844 cm = (struct cmsghdr *)
1845 ((caddr_t)cm + CMSG_SPACE(datalen));
1846 } else {
1847 clen = 0;
1848 cm = NULL;
1849 }
1850 }
1851
1852 m_freem(control);
1853 return (error);
1854 }
1855
1856 static void
1857 unp_zone_change(void *tag)
1858 {
1859
1860 uma_zone_set_max(unp_zone, maxsockets);
1861 }
1862
1863 static void
1864 unp_init(void)
1865 {
1866
1867 #ifdef VIMAGE
1868 if (!IS_DEFAULT_VNET(curvnet))
1869 return;
1870 #endif
1871 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1872 NULL, NULL, UMA_ALIGN_PTR, 0);
1873 if (unp_zone == NULL)
1874 panic("unp_init");
1875 uma_zone_set_max(unp_zone, maxsockets);
1876 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1877 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1878 NULL, EVENTHANDLER_PRI_ANY);
1879 LIST_INIT(&unp_dhead);
1880 LIST_INIT(&unp_shead);
1881 LIST_INIT(&unp_sphead);
1882 SLIST_INIT(&unp_defers);
1883 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1884 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1885 UNP_LINK_LOCK_INIT();
1886 UNP_LIST_LOCK_INIT();
1887 UNP_DEFERRED_LOCK_INIT();
1888 }
1889
1890 static int
1891 unp_internalize(struct mbuf **controlp, struct thread *td)
1892 {
1893 struct mbuf *control = *controlp;
1894 struct proc *p = td->td_proc;
1895 struct filedesc *fdesc = p->p_fd;
1896 struct bintime *bt;
1897 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1898 struct cmsgcred *cmcred;
1899 struct filedescent *fde, **fdep, *fdev;
1900 struct file *fp;
1901 struct timeval *tv;
1902 int i, *fdp;
1903 void *data;
1904 socklen_t clen = control->m_len, datalen;
1905 int error, oldfds;
1906 u_int newlen;
1907
1908 UNP_LINK_UNLOCK_ASSERT();
1909
1910 error = 0;
1911 *controlp = NULL;
1912 while (cm != NULL) {
1913 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1914 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
1915 error = EINVAL;
1916 goto out;
1917 }
1918 data = CMSG_DATA(cm);
1919 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1920
1921 switch (cm->cmsg_type) {
1922 /*
1923 * Fill in credential information.
1924 */
1925 case SCM_CREDS:
1926 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1927 SCM_CREDS, SOL_SOCKET);
1928 if (*controlp == NULL) {
1929 error = ENOBUFS;
1930 goto out;
1931 }
1932 cmcred = (struct cmsgcred *)
1933 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1934 cmcred->cmcred_pid = p->p_pid;
1935 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1936 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1937 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1938 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1939 CMGROUP_MAX);
1940 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1941 cmcred->cmcred_groups[i] =
1942 td->td_ucred->cr_groups[i];
1943 break;
1944
1945 case SCM_RIGHTS:
1946 oldfds = datalen / sizeof (int);
1947 if (oldfds == 0)
1948 break;
1949 /*
1950 * Check that all the FDs passed in refer to legal
1951 * files. If not, reject the entire operation.
1952 */
1953 fdp = data;
1954 FILEDESC_SLOCK(fdesc);
1955 for (i = 0; i < oldfds; i++, fdp++) {
1956 fp = fget_locked(fdesc, *fdp);
1957 if (fp == NULL) {
1958 FILEDESC_SUNLOCK(fdesc);
1959 error = EBADF;
1960 goto out;
1961 }
1962 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1963 FILEDESC_SUNLOCK(fdesc);
1964 error = EOPNOTSUPP;
1965 goto out;
1966 }
1967
1968 }
1969
1970 /*
1971 * Now replace the integer FDs with pointers to the
1972 * file structure and capability rights.
1973 */
1974 newlen = oldfds * sizeof(fdep[0]);
1975 *controlp = sbcreatecontrol(NULL, newlen,
1976 SCM_RIGHTS, SOL_SOCKET);
1977 if (*controlp == NULL) {
1978 FILEDESC_SUNLOCK(fdesc);
1979 error = E2BIG;
1980 goto out;
1981 }
1982 fdp = data;
1983 fdep = (struct filedescent **)
1984 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1985 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1986 M_WAITOK);
1987 for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1988 fde = &fdesc->fd_ofiles[*fdp];
1989 fdep[i] = fdev;
1990 fdep[i]->fde_file = fde->fde_file;
1991 filecaps_copy(&fde->fde_caps,
1992 &fdep[i]->fde_caps, true);
1993 unp_internalize_fp(fdep[i]->fde_file);
1994 }
1995 FILEDESC_SUNLOCK(fdesc);
1996 break;
1997
1998 case SCM_TIMESTAMP:
1999 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
2000 SCM_TIMESTAMP, SOL_SOCKET);
2001 if (*controlp == NULL) {
2002 error = ENOBUFS;
2003 goto out;
2004 }
2005 tv = (struct timeval *)
2006 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2007 microtime(tv);
2008 break;
2009
2010 case SCM_BINTIME:
2011 *controlp = sbcreatecontrol(NULL, sizeof(*bt),
2012 SCM_BINTIME, SOL_SOCKET);
2013 if (*controlp == NULL) {
2014 error = ENOBUFS;
2015 goto out;
2016 }
2017 bt = (struct bintime *)
2018 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2019 bintime(bt);
2020 break;
2021
2022 default:
2023 error = EINVAL;
2024 goto out;
2025 }
2026
2027 controlp = &(*controlp)->m_next;
2028 if (CMSG_SPACE(datalen) < clen) {
2029 clen -= CMSG_SPACE(datalen);
2030 cm = (struct cmsghdr *)
2031 ((caddr_t)cm + CMSG_SPACE(datalen));
2032 } else {
2033 clen = 0;
2034 cm = NULL;
2035 }
2036 }
2037
2038 out:
2039 m_freem(control);
2040 return (error);
2041 }
2042
2043 static struct mbuf *
2044 unp_addsockcred(struct thread *td, struct mbuf *control)
2045 {
2046 struct mbuf *m, *n, *n_prev;
2047 struct sockcred *sc;
2048 const struct cmsghdr *cm;
2049 int ngroups;
2050 int i;
2051
2052 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2053 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2054 if (m == NULL)
2055 return (control);
2056
2057 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2058 sc->sc_uid = td->td_ucred->cr_ruid;
2059 sc->sc_euid = td->td_ucred->cr_uid;
2060 sc->sc_gid = td->td_ucred->cr_rgid;
2061 sc->sc_egid = td->td_ucred->cr_gid;
2062 sc->sc_ngroups = ngroups;
2063 for (i = 0; i < sc->sc_ngroups; i++)
2064 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2065
2066 /*
2067 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2068 * created SCM_CREDS control message (struct sockcred) has another
2069 * format.
2070 */
2071 if (control != NULL)
2072 for (n = control, n_prev = NULL; n != NULL;) {
2073 cm = mtod(n, struct cmsghdr *);
2074 if (cm->cmsg_level == SOL_SOCKET &&
2075 cm->cmsg_type == SCM_CREDS) {
2076 if (n_prev == NULL)
2077 control = n->m_next;
2078 else
2079 n_prev->m_next = n->m_next;
2080 n = m_free(n);
2081 } else {
2082 n_prev = n;
2083 n = n->m_next;
2084 }
2085 }
2086
2087 /* Prepend it to the head. */
2088 m->m_next = control;
2089 return (m);
2090 }
2091
2092 static struct unpcb *
2093 fptounp(struct file *fp)
2094 {
2095 struct socket *so;
2096
2097 if (fp->f_type != DTYPE_SOCKET)
2098 return (NULL);
2099 if ((so = fp->f_data) == NULL)
2100 return (NULL);
2101 if (so->so_proto->pr_domain != &localdomain)
2102 return (NULL);
2103 return sotounpcb(so);
2104 }
2105
2106 static void
2107 unp_discard(struct file *fp)
2108 {
2109 struct unp_defer *dr;
2110
2111 if (unp_externalize_fp(fp)) {
2112 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2113 dr->ud_fp = fp;
2114 UNP_DEFERRED_LOCK();
2115 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2116 UNP_DEFERRED_UNLOCK();
2117 atomic_add_int(&unp_defers_count, 1);
2118 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2119 } else
2120 (void) closef(fp, (struct thread *)NULL);
2121 }
2122
2123 static void
2124 unp_process_defers(void *arg __unused, int pending)
2125 {
2126 struct unp_defer *dr;
2127 SLIST_HEAD(, unp_defer) drl;
2128 int count;
2129
2130 SLIST_INIT(&drl);
2131 for (;;) {
2132 UNP_DEFERRED_LOCK();
2133 if (SLIST_FIRST(&unp_defers) == NULL) {
2134 UNP_DEFERRED_UNLOCK();
2135 break;
2136 }
2137 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2138 UNP_DEFERRED_UNLOCK();
2139 count = 0;
2140 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2141 SLIST_REMOVE_HEAD(&drl, ud_link);
2142 closef(dr->ud_fp, NULL);
2143 free(dr, M_TEMP);
2144 count++;
2145 }
2146 atomic_add_int(&unp_defers_count, -count);
2147 }
2148 }
2149
2150 static void
2151 unp_internalize_fp(struct file *fp)
2152 {
2153 struct unpcb *unp;
2154
2155 UNP_LINK_WLOCK();
2156 if ((unp = fptounp(fp)) != NULL) {
2157 unp->unp_file = fp;
2158 unp->unp_msgcount++;
2159 }
2160 fhold(fp);
2161 unp_rights++;
2162 UNP_LINK_WUNLOCK();
2163 }
2164
2165 static int
2166 unp_externalize_fp(struct file *fp)
2167 {
2168 struct unpcb *unp;
2169 int ret;
2170
2171 UNP_LINK_WLOCK();
2172 if ((unp = fptounp(fp)) != NULL) {
2173 unp->unp_msgcount--;
2174 ret = 1;
2175 } else
2176 ret = 0;
2177 unp_rights--;
2178 UNP_LINK_WUNLOCK();
2179 return (ret);
2180 }
2181
2182 /*
2183 * unp_defer indicates whether additional work has been defered for a future
2184 * pass through unp_gc(). It is thread local and does not require explicit
2185 * synchronization.
2186 */
2187 static int unp_marked;
2188 static int unp_unreachable;
2189
2190 static void
2191 unp_accessable(struct filedescent **fdep, int fdcount)
2192 {
2193 struct unpcb *unp;
2194 struct file *fp;
2195 int i;
2196
2197 for (i = 0; i < fdcount; i++) {
2198 fp = fdep[i]->fde_file;
2199 if ((unp = fptounp(fp)) == NULL)
2200 continue;
2201 if (unp->unp_gcflag & UNPGC_REF)
2202 continue;
2203 unp->unp_gcflag &= ~UNPGC_DEAD;
2204 unp->unp_gcflag |= UNPGC_REF;
2205 unp_marked++;
2206 }
2207 }
2208
2209 static void
2210 unp_gc_process(struct unpcb *unp)
2211 {
2212 struct socket *soa;
2213 struct socket *so;
2214 struct file *fp;
2215
2216 /* Already processed. */
2217 if (unp->unp_gcflag & UNPGC_SCANNED)
2218 return;
2219 fp = unp->unp_file;
2220
2221 /*
2222 * Check for a socket potentially in a cycle. It must be in a
2223 * queue as indicated by msgcount, and this must equal the file
2224 * reference count. Note that when msgcount is 0 the file is NULL.
2225 */
2226 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2227 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2228 unp->unp_gcflag |= UNPGC_DEAD;
2229 unp_unreachable++;
2230 return;
2231 }
2232
2233 /*
2234 * Mark all sockets we reference with RIGHTS.
2235 */
2236 so = unp->unp_socket;
2237 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) {
2238 SOCKBUF_LOCK(&so->so_rcv);
2239 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2240 SOCKBUF_UNLOCK(&so->so_rcv);
2241 }
2242
2243 /*
2244 * Mark all sockets in our accept queue.
2245 */
2246 ACCEPT_LOCK();
2247 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2248 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0)
2249 continue;
2250 SOCKBUF_LOCK(&soa->so_rcv);
2251 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2252 SOCKBUF_UNLOCK(&soa->so_rcv);
2253 }
2254 ACCEPT_UNLOCK();
2255 unp->unp_gcflag |= UNPGC_SCANNED;
2256 }
2257
2258 static int unp_recycled;
2259 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2260 "Number of unreachable sockets claimed by the garbage collector.");
2261
2262 static int unp_taskcount;
2263 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2264 "Number of times the garbage collector has run.");
2265
2266 static void
2267 unp_gc(__unused void *arg, int pending)
2268 {
2269 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2270 NULL };
2271 struct unp_head **head;
2272 struct file *f, **unref;
2273 struct unpcb *unp;
2274 int i, total;
2275
2276 unp_taskcount++;
2277 UNP_LIST_LOCK();
2278 /*
2279 * First clear all gc flags from previous runs, apart from
2280 * UNPGC_IGNORE_RIGHTS.
2281 */
2282 for (head = heads; *head != NULL; head++)
2283 LIST_FOREACH(unp, *head, unp_link)
2284 unp->unp_gcflag =
2285 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS);
2286
2287 /*
2288 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2289 * is reachable all of the sockets it references are reachable.
2290 * Stop the scan once we do a complete loop without discovering
2291 * a new reachable socket.
2292 */
2293 do {
2294 unp_unreachable = 0;
2295 unp_marked = 0;
2296 for (head = heads; *head != NULL; head++)
2297 LIST_FOREACH(unp, *head, unp_link)
2298 unp_gc_process(unp);
2299 } while (unp_marked);
2300 UNP_LIST_UNLOCK();
2301 if (unp_unreachable == 0)
2302 return;
2303
2304 /*
2305 * Allocate space for a local list of dead unpcbs.
2306 */
2307 unref = malloc(unp_unreachable * sizeof(struct file *),
2308 M_TEMP, M_WAITOK);
2309
2310 /*
2311 * Iterate looking for sockets which have been specifically marked
2312 * as as unreachable and store them locally.
2313 */
2314 UNP_LINK_RLOCK();
2315 UNP_LIST_LOCK();
2316 for (total = 0, head = heads; *head != NULL; head++)
2317 LIST_FOREACH(unp, *head, unp_link)
2318 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2319 f = unp->unp_file;
2320 if (unp->unp_msgcount == 0 || f == NULL ||
2321 f->f_count != unp->unp_msgcount)
2322 continue;
2323 unref[total++] = f;
2324 fhold(f);
2325 KASSERT(total <= unp_unreachable,
2326 ("unp_gc: incorrect unreachable count."));
2327 }
2328 UNP_LIST_UNLOCK();
2329 UNP_LINK_RUNLOCK();
2330
2331 /*
2332 * Now flush all sockets, free'ing rights. This will free the
2333 * struct files associated with these sockets but leave each socket
2334 * with one remaining ref.
2335 */
2336 for (i = 0; i < total; i++) {
2337 struct socket *so;
2338
2339 so = unref[i]->f_data;
2340 CURVNET_SET(so->so_vnet);
2341 sorflush(so);
2342 CURVNET_RESTORE();
2343 }
2344
2345 /*
2346 * And finally release the sockets so they can be reclaimed.
2347 */
2348 for (i = 0; i < total; i++)
2349 fdrop(unref[i], NULL);
2350 unp_recycled += total;
2351 free(unref, M_TEMP);
2352 }
2353
2354 static void
2355 unp_dispose(struct mbuf *m)
2356 {
2357
2358 if (m)
2359 unp_scan(m, unp_freerights);
2360 }
2361
2362 /*
2363 * Synchronize against unp_gc, which can trip over data as we are freeing it.
2364 */
2365 static void
2366 unp_dispose_so(struct socket *so)
2367 {
2368 struct unpcb *unp;
2369
2370 unp = sotounpcb(so);
2371 UNP_LIST_LOCK();
2372 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
2373 UNP_LIST_UNLOCK();
2374 unp_dispose(so->so_rcv.sb_mb);
2375 }
2376
2377 static void
2378 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2379 {
2380 struct mbuf *m;
2381 struct cmsghdr *cm;
2382 void *data;
2383 socklen_t clen, datalen;
2384
2385 while (m0 != NULL) {
2386 for (m = m0; m; m = m->m_next) {
2387 if (m->m_type != MT_CONTROL)
2388 continue;
2389
2390 cm = mtod(m, struct cmsghdr *);
2391 clen = m->m_len;
2392
2393 while (cm != NULL) {
2394 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2395 break;
2396
2397 data = CMSG_DATA(cm);
2398 datalen = (caddr_t)cm + cm->cmsg_len
2399 - (caddr_t)data;
2400
2401 if (cm->cmsg_level == SOL_SOCKET &&
2402 cm->cmsg_type == SCM_RIGHTS) {
2403 (*op)(data, datalen /
2404 sizeof(struct filedescent *));
2405 }
2406
2407 if (CMSG_SPACE(datalen) < clen) {
2408 clen -= CMSG_SPACE(datalen);
2409 cm = (struct cmsghdr *)
2410 ((caddr_t)cm + CMSG_SPACE(datalen));
2411 } else {
2412 clen = 0;
2413 cm = NULL;
2414 }
2415 }
2416 }
2417 m0 = m0->m_nextpkt;
2418 }
2419 }
2420
2421 /*
2422 * A helper function called by VFS before socket-type vnode reclamation.
2423 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2424 * use count.
2425 */
2426 void
2427 vfs_unp_reclaim(struct vnode *vp)
2428 {
2429 struct socket *so;
2430 struct unpcb *unp;
2431 int active;
2432
2433 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2434 KASSERT(vp->v_type == VSOCK,
2435 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2436
2437 active = 0;
2438 UNP_LINK_WLOCK();
2439 VOP_UNP_CONNECT(vp, &so);
2440 if (so == NULL)
2441 goto done;
2442 unp = sotounpcb(so);
2443 if (unp == NULL)
2444 goto done;
2445 UNP_PCB_LOCK(unp);
2446 if (unp->unp_vnode == vp) {
2447 VOP_UNP_DETACH(vp);
2448 unp->unp_vnode = NULL;
2449 active = 1;
2450 }
2451 UNP_PCB_UNLOCK(unp);
2452 done:
2453 UNP_LINK_WUNLOCK();
2454 if (active)
2455 vunref(vp);
2456 }
2457
2458 #ifdef DDB
2459 static void
2460 db_print_indent(int indent)
2461 {
2462 int i;
2463
2464 for (i = 0; i < indent; i++)
2465 db_printf(" ");
2466 }
2467
2468 static void
2469 db_print_unpflags(int unp_flags)
2470 {
2471 int comma;
2472
2473 comma = 0;
2474 if (unp_flags & UNP_HAVEPC) {
2475 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2476 comma = 1;
2477 }
2478 if (unp_flags & UNP_HAVEPCCACHED) {
2479 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2480 comma = 1;
2481 }
2482 if (unp_flags & UNP_WANTCRED) {
2483 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2484 comma = 1;
2485 }
2486 if (unp_flags & UNP_CONNWAIT) {
2487 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2488 comma = 1;
2489 }
2490 if (unp_flags & UNP_CONNECTING) {
2491 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2492 comma = 1;
2493 }
2494 if (unp_flags & UNP_BINDING) {
2495 db_printf("%sUNP_BINDING", comma ? ", " : "");
2496 comma = 1;
2497 }
2498 }
2499
2500 static void
2501 db_print_xucred(int indent, struct xucred *xu)
2502 {
2503 int comma, i;
2504
2505 db_print_indent(indent);
2506 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2507 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2508 db_print_indent(indent);
2509 db_printf("cr_groups: ");
2510 comma = 0;
2511 for (i = 0; i < xu->cr_ngroups; i++) {
2512 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2513 comma = 1;
2514 }
2515 db_printf("\n");
2516 }
2517
2518 static void
2519 db_print_unprefs(int indent, struct unp_head *uh)
2520 {
2521 struct unpcb *unp;
2522 int counter;
2523
2524 counter = 0;
2525 LIST_FOREACH(unp, uh, unp_reflink) {
2526 if (counter % 4 == 0)
2527 db_print_indent(indent);
2528 db_printf("%p ", unp);
2529 if (counter % 4 == 3)
2530 db_printf("\n");
2531 counter++;
2532 }
2533 if (counter != 0 && counter % 4 != 0)
2534 db_printf("\n");
2535 }
2536
2537 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2538 {
2539 struct unpcb *unp;
2540
2541 if (!have_addr) {
2542 db_printf("usage: show unpcb <addr>\n");
2543 return;
2544 }
2545 unp = (struct unpcb *)addr;
2546
2547 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2548 unp->unp_vnode);
2549
2550 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2551 unp->unp_conn);
2552
2553 db_printf("unp_refs:\n");
2554 db_print_unprefs(2, &unp->unp_refs);
2555
2556 /* XXXRW: Would be nice to print the full address, if any. */
2557 db_printf("unp_addr: %p\n", unp->unp_addr);
2558
2559 db_printf("unp_gencnt: %llu\n",
2560 (unsigned long long)unp->unp_gencnt);
2561
2562 db_printf("unp_flags: %x (", unp->unp_flags);
2563 db_print_unpflags(unp->unp_flags);
2564 db_printf(")\n");
2565
2566 db_printf("unp_peercred:\n");
2567 db_print_xucred(2, &unp->unp_peercred);
2568
2569 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2570 }
2571 #endif
Cache object: aa8ecf3e0a97d321df0356952ef158f3
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