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/11.2/sys/kern/uipc_usrreq.c 331722 2018-03-29 02:50:57Z eadler $");
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 /*
1060 * In case of PRUS_NOTREADY, uipc_ready() is responsible
1061 * for freeing memory.
1062 */
1063 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1064 m_freem(m);
1065 return (error);
1066 }
1067
1068 static int
1069 uipc_ready(struct socket *so, struct mbuf *m, int count)
1070 {
1071 struct unpcb *unp, *unp2;
1072 struct socket *so2;
1073 int error;
1074
1075 unp = sotounpcb(so);
1076
1077 UNP_LINK_RLOCK();
1078 if ((unp2 = unp->unp_conn) == NULL) {
1079 UNP_LINK_RUNLOCK();
1080 for (int i = 0; i < count; i++)
1081 m = m_free(m);
1082 return (ECONNRESET);
1083 }
1084 UNP_PCB_LOCK(unp2);
1085 so2 = unp2->unp_socket;
1086
1087 SOCKBUF_LOCK(&so2->so_rcv);
1088 if ((error = sbready(&so2->so_rcv, m, count)) == 0)
1089 sorwakeup_locked(so2);
1090 else
1091 SOCKBUF_UNLOCK(&so2->so_rcv);
1092
1093 UNP_PCB_UNLOCK(unp2);
1094 UNP_LINK_RUNLOCK();
1095
1096 return (error);
1097 }
1098
1099 static int
1100 uipc_sense(struct socket *so, struct stat *sb)
1101 {
1102 struct unpcb *unp;
1103
1104 unp = sotounpcb(so);
1105 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1106
1107 sb->st_blksize = so->so_snd.sb_hiwat;
1108 UNP_PCB_LOCK(unp);
1109 sb->st_dev = NODEV;
1110 if (unp->unp_ino == 0)
1111 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1112 sb->st_ino = unp->unp_ino;
1113 UNP_PCB_UNLOCK(unp);
1114 return (0);
1115 }
1116
1117 static int
1118 uipc_shutdown(struct socket *so)
1119 {
1120 struct unpcb *unp;
1121
1122 unp = sotounpcb(so);
1123 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1124
1125 UNP_LINK_WLOCK();
1126 UNP_PCB_LOCK(unp);
1127 socantsendmore(so);
1128 unp_shutdown(unp);
1129 UNP_PCB_UNLOCK(unp);
1130 UNP_LINK_WUNLOCK();
1131 return (0);
1132 }
1133
1134 static int
1135 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1136 {
1137 struct unpcb *unp;
1138 const struct sockaddr *sa;
1139
1140 unp = sotounpcb(so);
1141 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1142
1143 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1144 UNP_PCB_LOCK(unp);
1145 if (unp->unp_addr != NULL)
1146 sa = (struct sockaddr *) unp->unp_addr;
1147 else
1148 sa = &sun_noname;
1149 bcopy(sa, *nam, sa->sa_len);
1150 UNP_PCB_UNLOCK(unp);
1151 return (0);
1152 }
1153
1154 static struct pr_usrreqs uipc_usrreqs_dgram = {
1155 .pru_abort = uipc_abort,
1156 .pru_accept = uipc_accept,
1157 .pru_attach = uipc_attach,
1158 .pru_bind = uipc_bind,
1159 .pru_bindat = uipc_bindat,
1160 .pru_connect = uipc_connect,
1161 .pru_connectat = uipc_connectat,
1162 .pru_connect2 = uipc_connect2,
1163 .pru_detach = uipc_detach,
1164 .pru_disconnect = uipc_disconnect,
1165 .pru_listen = uipc_listen,
1166 .pru_peeraddr = uipc_peeraddr,
1167 .pru_rcvd = uipc_rcvd,
1168 .pru_send = uipc_send,
1169 .pru_sense = uipc_sense,
1170 .pru_shutdown = uipc_shutdown,
1171 .pru_sockaddr = uipc_sockaddr,
1172 .pru_soreceive = soreceive_dgram,
1173 .pru_close = uipc_close,
1174 };
1175
1176 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1177 .pru_abort = uipc_abort,
1178 .pru_accept = uipc_accept,
1179 .pru_attach = uipc_attach,
1180 .pru_bind = uipc_bind,
1181 .pru_bindat = uipc_bindat,
1182 .pru_connect = uipc_connect,
1183 .pru_connectat = uipc_connectat,
1184 .pru_connect2 = uipc_connect2,
1185 .pru_detach = uipc_detach,
1186 .pru_disconnect = uipc_disconnect,
1187 .pru_listen = uipc_listen,
1188 .pru_peeraddr = uipc_peeraddr,
1189 .pru_rcvd = uipc_rcvd,
1190 .pru_send = uipc_send,
1191 .pru_sense = uipc_sense,
1192 .pru_shutdown = uipc_shutdown,
1193 .pru_sockaddr = uipc_sockaddr,
1194 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1195 .pru_close = uipc_close,
1196 };
1197
1198 static struct pr_usrreqs uipc_usrreqs_stream = {
1199 .pru_abort = uipc_abort,
1200 .pru_accept = uipc_accept,
1201 .pru_attach = uipc_attach,
1202 .pru_bind = uipc_bind,
1203 .pru_bindat = uipc_bindat,
1204 .pru_connect = uipc_connect,
1205 .pru_connectat = uipc_connectat,
1206 .pru_connect2 = uipc_connect2,
1207 .pru_detach = uipc_detach,
1208 .pru_disconnect = uipc_disconnect,
1209 .pru_listen = uipc_listen,
1210 .pru_peeraddr = uipc_peeraddr,
1211 .pru_rcvd = uipc_rcvd,
1212 .pru_send = uipc_send,
1213 .pru_ready = uipc_ready,
1214 .pru_sense = uipc_sense,
1215 .pru_shutdown = uipc_shutdown,
1216 .pru_sockaddr = uipc_sockaddr,
1217 .pru_soreceive = soreceive_generic,
1218 .pru_close = uipc_close,
1219 };
1220
1221 static int
1222 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1223 {
1224 struct unpcb *unp;
1225 struct xucred xu;
1226 int error, optval;
1227
1228 if (sopt->sopt_level != 0)
1229 return (EINVAL);
1230
1231 unp = sotounpcb(so);
1232 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1233 error = 0;
1234 switch (sopt->sopt_dir) {
1235 case SOPT_GET:
1236 switch (sopt->sopt_name) {
1237 case LOCAL_PEERCRED:
1238 UNP_PCB_LOCK(unp);
1239 if (unp->unp_flags & UNP_HAVEPC)
1240 xu = unp->unp_peercred;
1241 else {
1242 if (so->so_type == SOCK_STREAM)
1243 error = ENOTCONN;
1244 else
1245 error = EINVAL;
1246 }
1247 UNP_PCB_UNLOCK(unp);
1248 if (error == 0)
1249 error = sooptcopyout(sopt, &xu, sizeof(xu));
1250 break;
1251
1252 case LOCAL_CREDS:
1253 /* Unlocked read. */
1254 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1255 error = sooptcopyout(sopt, &optval, sizeof(optval));
1256 break;
1257
1258 case LOCAL_CONNWAIT:
1259 /* Unlocked read. */
1260 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1261 error = sooptcopyout(sopt, &optval, sizeof(optval));
1262 break;
1263
1264 default:
1265 error = EOPNOTSUPP;
1266 break;
1267 }
1268 break;
1269
1270 case SOPT_SET:
1271 switch (sopt->sopt_name) {
1272 case LOCAL_CREDS:
1273 case LOCAL_CONNWAIT:
1274 error = sooptcopyin(sopt, &optval, sizeof(optval),
1275 sizeof(optval));
1276 if (error)
1277 break;
1278
1279 #define OPTSET(bit) do { \
1280 UNP_PCB_LOCK(unp); \
1281 if (optval) \
1282 unp->unp_flags |= bit; \
1283 else \
1284 unp->unp_flags &= ~bit; \
1285 UNP_PCB_UNLOCK(unp); \
1286 } while (0)
1287
1288 switch (sopt->sopt_name) {
1289 case LOCAL_CREDS:
1290 OPTSET(UNP_WANTCRED);
1291 break;
1292
1293 case LOCAL_CONNWAIT:
1294 OPTSET(UNP_CONNWAIT);
1295 break;
1296
1297 default:
1298 break;
1299 }
1300 break;
1301 #undef OPTSET
1302 default:
1303 error = ENOPROTOOPT;
1304 break;
1305 }
1306 break;
1307
1308 default:
1309 error = EOPNOTSUPP;
1310 break;
1311 }
1312 return (error);
1313 }
1314
1315 static int
1316 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1317 {
1318
1319 return (unp_connectat(AT_FDCWD, so, nam, td));
1320 }
1321
1322 static int
1323 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1324 struct thread *td)
1325 {
1326 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1327 struct vnode *vp;
1328 struct socket *so2, *so3;
1329 struct unpcb *unp, *unp2, *unp3;
1330 struct nameidata nd;
1331 char buf[SOCK_MAXADDRLEN];
1332 struct sockaddr *sa;
1333 cap_rights_t rights;
1334 int error, len;
1335
1336 if (nam->sa_family != AF_UNIX)
1337 return (EAFNOSUPPORT);
1338
1339 UNP_LINK_WLOCK_ASSERT();
1340
1341 unp = sotounpcb(so);
1342 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1343
1344 if (nam->sa_len > sizeof(struct sockaddr_un))
1345 return (EINVAL);
1346 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1347 if (len <= 0)
1348 return (EINVAL);
1349 bcopy(soun->sun_path, buf, len);
1350 buf[len] = 0;
1351
1352 UNP_PCB_LOCK(unp);
1353 if (unp->unp_flags & UNP_CONNECTING) {
1354 UNP_PCB_UNLOCK(unp);
1355 return (EALREADY);
1356 }
1357 UNP_LINK_WUNLOCK();
1358 unp->unp_flags |= UNP_CONNECTING;
1359 UNP_PCB_UNLOCK(unp);
1360
1361 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1362 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1363 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1364 error = namei(&nd);
1365 if (error)
1366 vp = NULL;
1367 else
1368 vp = nd.ni_vp;
1369 ASSERT_VOP_LOCKED(vp, "unp_connect");
1370 NDFREE(&nd, NDF_ONLY_PNBUF);
1371 if (error)
1372 goto bad;
1373
1374 if (vp->v_type != VSOCK) {
1375 error = ENOTSOCK;
1376 goto bad;
1377 }
1378 #ifdef MAC
1379 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1380 if (error)
1381 goto bad;
1382 #endif
1383 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1384 if (error)
1385 goto bad;
1386
1387 unp = sotounpcb(so);
1388 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1389
1390 /*
1391 * Lock linkage lock for two reasons: make sure v_socket is stable,
1392 * and to protect simultaneous locking of multiple pcbs.
1393 */
1394 UNP_LINK_WLOCK();
1395 VOP_UNP_CONNECT(vp, &so2);
1396 if (so2 == NULL) {
1397 error = ECONNREFUSED;
1398 goto bad2;
1399 }
1400 if (so->so_type != so2->so_type) {
1401 error = EPROTOTYPE;
1402 goto bad2;
1403 }
1404 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1405 if (so2->so_options & SO_ACCEPTCONN) {
1406 CURVNET_SET(so2->so_vnet);
1407 so3 = sonewconn(so2, 0);
1408 CURVNET_RESTORE();
1409 } else
1410 so3 = NULL;
1411 if (so3 == NULL) {
1412 error = ECONNREFUSED;
1413 goto bad2;
1414 }
1415 unp = sotounpcb(so);
1416 unp2 = sotounpcb(so2);
1417 unp3 = sotounpcb(so3);
1418 UNP_PCB_LOCK(unp);
1419 UNP_PCB_LOCK(unp2);
1420 UNP_PCB_LOCK(unp3);
1421 if (unp2->unp_addr != NULL) {
1422 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1423 unp3->unp_addr = (struct sockaddr_un *) sa;
1424 sa = NULL;
1425 }
1426
1427 /*
1428 * The connector's (client's) credentials are copied from its
1429 * process structure at the time of connect() (which is now).
1430 */
1431 cru2x(td->td_ucred, &unp3->unp_peercred);
1432 unp3->unp_flags |= UNP_HAVEPC;
1433
1434 /*
1435 * The receiver's (server's) credentials are copied from the
1436 * unp_peercred member of socket on which the former called
1437 * listen(); uipc_listen() cached that process's credentials
1438 * at that time so we can use them now.
1439 */
1440 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1441 ("unp_connect: listener without cached peercred"));
1442 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1443 sizeof(unp->unp_peercred));
1444 unp->unp_flags |= UNP_HAVEPC;
1445 if (unp2->unp_flags & UNP_WANTCRED)
1446 unp3->unp_flags |= UNP_WANTCRED;
1447 UNP_PCB_UNLOCK(unp3);
1448 UNP_PCB_UNLOCK(unp2);
1449 UNP_PCB_UNLOCK(unp);
1450 #ifdef MAC
1451 mac_socketpeer_set_from_socket(so, so3);
1452 mac_socketpeer_set_from_socket(so3, so);
1453 #endif
1454
1455 so2 = so3;
1456 }
1457 unp = sotounpcb(so);
1458 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1459 unp2 = sotounpcb(so2);
1460 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1461 UNP_PCB_LOCK(unp);
1462 UNP_PCB_LOCK(unp2);
1463 error = unp_connect2(so, so2, PRU_CONNECT);
1464 UNP_PCB_UNLOCK(unp2);
1465 UNP_PCB_UNLOCK(unp);
1466 bad2:
1467 UNP_LINK_WUNLOCK();
1468 bad:
1469 if (vp != NULL)
1470 vput(vp);
1471 free(sa, M_SONAME);
1472 UNP_LINK_WLOCK();
1473 UNP_PCB_LOCK(unp);
1474 unp->unp_flags &= ~UNP_CONNECTING;
1475 UNP_PCB_UNLOCK(unp);
1476 return (error);
1477 }
1478
1479 static int
1480 unp_connect2(struct socket *so, struct socket *so2, int req)
1481 {
1482 struct unpcb *unp;
1483 struct unpcb *unp2;
1484
1485 unp = sotounpcb(so);
1486 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1487 unp2 = sotounpcb(so2);
1488 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1489
1490 UNP_LINK_WLOCK_ASSERT();
1491 UNP_PCB_LOCK_ASSERT(unp);
1492 UNP_PCB_LOCK_ASSERT(unp2);
1493
1494 if (so2->so_type != so->so_type)
1495 return (EPROTOTYPE);
1496 unp2->unp_flags &= ~UNP_NASCENT;
1497 unp->unp_conn = unp2;
1498
1499 switch (so->so_type) {
1500 case SOCK_DGRAM:
1501 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1502 soisconnected(so);
1503 break;
1504
1505 case SOCK_STREAM:
1506 case SOCK_SEQPACKET:
1507 unp2->unp_conn = unp;
1508 if (req == PRU_CONNECT &&
1509 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1510 soisconnecting(so);
1511 else
1512 soisconnected(so);
1513 soisconnected(so2);
1514 break;
1515
1516 default:
1517 panic("unp_connect2");
1518 }
1519 return (0);
1520 }
1521
1522 static void
1523 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1524 {
1525 struct socket *so;
1526
1527 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1528
1529 UNP_LINK_WLOCK_ASSERT();
1530 UNP_PCB_LOCK_ASSERT(unp);
1531 UNP_PCB_LOCK_ASSERT(unp2);
1532
1533 unp->unp_conn = NULL;
1534 switch (unp->unp_socket->so_type) {
1535 case SOCK_DGRAM:
1536 LIST_REMOVE(unp, unp_reflink);
1537 so = unp->unp_socket;
1538 SOCK_LOCK(so);
1539 so->so_state &= ~SS_ISCONNECTED;
1540 SOCK_UNLOCK(so);
1541 break;
1542
1543 case SOCK_STREAM:
1544 case SOCK_SEQPACKET:
1545 soisdisconnected(unp->unp_socket);
1546 unp2->unp_conn = NULL;
1547 soisdisconnected(unp2->unp_socket);
1548 break;
1549 }
1550 }
1551
1552 /*
1553 * unp_pcblist() walks the global list of struct unpcb's to generate a
1554 * pointer list, bumping the refcount on each unpcb. It then copies them out
1555 * sequentially, validating the generation number on each to see if it has
1556 * been detached. All of this is necessary because copyout() may sleep on
1557 * disk I/O.
1558 */
1559 static int
1560 unp_pcblist(SYSCTL_HANDLER_ARGS)
1561 {
1562 int error, i, n;
1563 int freeunp;
1564 struct unpcb *unp, **unp_list;
1565 unp_gen_t gencnt;
1566 struct xunpgen *xug;
1567 struct unp_head *head;
1568 struct xunpcb *xu;
1569
1570 switch ((intptr_t)arg1) {
1571 case SOCK_STREAM:
1572 head = &unp_shead;
1573 break;
1574
1575 case SOCK_DGRAM:
1576 head = &unp_dhead;
1577 break;
1578
1579 case SOCK_SEQPACKET:
1580 head = &unp_sphead;
1581 break;
1582
1583 default:
1584 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1585 }
1586
1587 /*
1588 * The process of preparing the PCB list is too time-consuming and
1589 * resource-intensive to repeat twice on every request.
1590 */
1591 if (req->oldptr == NULL) {
1592 n = unp_count;
1593 req->oldidx = 2 * (sizeof *xug)
1594 + (n + n/8) * sizeof(struct xunpcb);
1595 return (0);
1596 }
1597
1598 if (req->newptr != NULL)
1599 return (EPERM);
1600
1601 /*
1602 * OK, now we're committed to doing something.
1603 */
1604 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1605 UNP_LIST_LOCK();
1606 gencnt = unp_gencnt;
1607 n = unp_count;
1608 UNP_LIST_UNLOCK();
1609
1610 xug->xug_len = sizeof *xug;
1611 xug->xug_count = n;
1612 xug->xug_gen = gencnt;
1613 xug->xug_sogen = so_gencnt;
1614 error = SYSCTL_OUT(req, xug, sizeof *xug);
1615 if (error) {
1616 free(xug, M_TEMP);
1617 return (error);
1618 }
1619
1620 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1621
1622 UNP_LIST_LOCK();
1623 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1624 unp = LIST_NEXT(unp, unp_link)) {
1625 UNP_PCB_LOCK(unp);
1626 if (unp->unp_gencnt <= gencnt) {
1627 if (cr_cansee(req->td->td_ucred,
1628 unp->unp_socket->so_cred)) {
1629 UNP_PCB_UNLOCK(unp);
1630 continue;
1631 }
1632 unp_list[i++] = unp;
1633 unp->unp_refcount++;
1634 }
1635 UNP_PCB_UNLOCK(unp);
1636 }
1637 UNP_LIST_UNLOCK();
1638 n = i; /* In case we lost some during malloc. */
1639
1640 error = 0;
1641 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1642 for (i = 0; i < n; i++) {
1643 unp = unp_list[i];
1644 UNP_PCB_LOCK(unp);
1645 unp->unp_refcount--;
1646 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1647 xu->xu_len = sizeof *xu;
1648 xu->xu_unpp = unp;
1649 /*
1650 * XXX - need more locking here to protect against
1651 * connect/disconnect races for SMP.
1652 */
1653 if (unp->unp_addr != NULL)
1654 bcopy(unp->unp_addr, &xu->xu_addr,
1655 unp->unp_addr->sun_len);
1656 if (unp->unp_conn != NULL &&
1657 unp->unp_conn->unp_addr != NULL)
1658 bcopy(unp->unp_conn->unp_addr,
1659 &xu->xu_caddr,
1660 unp->unp_conn->unp_addr->sun_len);
1661 bcopy(unp, &xu->xu_unp, sizeof *unp);
1662 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1663 UNP_PCB_UNLOCK(unp);
1664 error = SYSCTL_OUT(req, xu, sizeof *xu);
1665 } else {
1666 freeunp = (unp->unp_refcount == 0);
1667 UNP_PCB_UNLOCK(unp);
1668 if (freeunp) {
1669 UNP_PCB_LOCK_DESTROY(unp);
1670 uma_zfree(unp_zone, unp);
1671 }
1672 }
1673 }
1674 free(xu, M_TEMP);
1675 if (!error) {
1676 /*
1677 * Give the user an updated idea of our state. If the
1678 * generation differs from what we told her before, she knows
1679 * that something happened while we were processing this
1680 * request, and it might be necessary to retry.
1681 */
1682 xug->xug_gen = unp_gencnt;
1683 xug->xug_sogen = so_gencnt;
1684 xug->xug_count = unp_count;
1685 error = SYSCTL_OUT(req, xug, sizeof *xug);
1686 }
1687 free(unp_list, M_TEMP);
1688 free(xug, M_TEMP);
1689 return (error);
1690 }
1691
1692 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1693 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1694 "List of active local datagram sockets");
1695 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1696 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1697 "List of active local stream sockets");
1698 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1699 CTLTYPE_OPAQUE | CTLFLAG_RD,
1700 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1701 "List of active local seqpacket sockets");
1702
1703 static void
1704 unp_shutdown(struct unpcb *unp)
1705 {
1706 struct unpcb *unp2;
1707 struct socket *so;
1708
1709 UNP_LINK_WLOCK_ASSERT();
1710 UNP_PCB_LOCK_ASSERT(unp);
1711
1712 unp2 = unp->unp_conn;
1713 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1714 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1715 so = unp2->unp_socket;
1716 if (so != NULL)
1717 socantrcvmore(so);
1718 }
1719 }
1720
1721 static void
1722 unp_drop(struct unpcb *unp)
1723 {
1724 struct socket *so = unp->unp_socket;
1725 struct unpcb *unp2;
1726
1727 UNP_LINK_WLOCK_ASSERT();
1728 UNP_PCB_LOCK_ASSERT(unp);
1729
1730 /*
1731 * Regardless of whether the socket's peer dropped the connection
1732 * with this socket by aborting or disconnecting, POSIX requires
1733 * that ECONNRESET is returned.
1734 */
1735 so->so_error = ECONNRESET;
1736 unp2 = unp->unp_conn;
1737 if (unp2 == NULL)
1738 return;
1739 UNP_PCB_LOCK(unp2);
1740 unp_disconnect(unp, unp2);
1741 UNP_PCB_UNLOCK(unp2);
1742 }
1743
1744 static void
1745 unp_freerights(struct filedescent **fdep, int fdcount)
1746 {
1747 struct file *fp;
1748 int i;
1749
1750 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1751
1752 for (i = 0; i < fdcount; i++) {
1753 fp = fdep[i]->fde_file;
1754 filecaps_free(&fdep[i]->fde_caps);
1755 unp_discard(fp);
1756 }
1757 free(fdep[0], M_FILECAPS);
1758 }
1759
1760 static int
1761 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1762 {
1763 struct thread *td = curthread; /* XXX */
1764 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1765 int i;
1766 int *fdp;
1767 struct filedesc *fdesc = td->td_proc->p_fd;
1768 struct filedescent **fdep;
1769 void *data;
1770 socklen_t clen = control->m_len, datalen;
1771 int error, newfds;
1772 u_int newlen;
1773
1774 UNP_LINK_UNLOCK_ASSERT();
1775
1776 error = 0;
1777 if (controlp != NULL) /* controlp == NULL => free control messages */
1778 *controlp = NULL;
1779 while (cm != NULL) {
1780 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1781 error = EINVAL;
1782 break;
1783 }
1784 data = CMSG_DATA(cm);
1785 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1786 if (cm->cmsg_level == SOL_SOCKET
1787 && cm->cmsg_type == SCM_RIGHTS) {
1788 newfds = datalen / sizeof(*fdep);
1789 if (newfds == 0)
1790 goto next;
1791 fdep = data;
1792
1793 /* If we're not outputting the descriptors free them. */
1794 if (error || controlp == NULL) {
1795 unp_freerights(fdep, newfds);
1796 goto next;
1797 }
1798 FILEDESC_XLOCK(fdesc);
1799
1800 /*
1801 * Now change each pointer to an fd in the global
1802 * table to an integer that is the index to the local
1803 * fd table entry that we set up to point to the
1804 * global one we are transferring.
1805 */
1806 newlen = newfds * sizeof(int);
1807 *controlp = sbcreatecontrol(NULL, newlen,
1808 SCM_RIGHTS, SOL_SOCKET);
1809 if (*controlp == NULL) {
1810 FILEDESC_XUNLOCK(fdesc);
1811 error = E2BIG;
1812 unp_freerights(fdep, newfds);
1813 goto next;
1814 }
1815
1816 fdp = (int *)
1817 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1818 if (fdallocn(td, 0, fdp, newfds) != 0) {
1819 FILEDESC_XUNLOCK(fdesc);
1820 error = EMSGSIZE;
1821 unp_freerights(fdep, newfds);
1822 m_freem(*controlp);
1823 *controlp = NULL;
1824 goto next;
1825 }
1826 for (i = 0; i < newfds; i++, fdp++) {
1827 _finstall(fdesc, fdep[i]->fde_file, *fdp,
1828 (flags & MSG_CMSG_CLOEXEC) != 0 ? UF_EXCLOSE : 0,
1829 &fdep[i]->fde_caps);
1830 unp_externalize_fp(fdep[i]->fde_file);
1831 }
1832 FILEDESC_XUNLOCK(fdesc);
1833 free(fdep[0], M_FILECAPS);
1834 } else {
1835 /* We can just copy anything else across. */
1836 if (error || controlp == NULL)
1837 goto next;
1838 *controlp = sbcreatecontrol(NULL, datalen,
1839 cm->cmsg_type, cm->cmsg_level);
1840 if (*controlp == NULL) {
1841 error = ENOBUFS;
1842 goto next;
1843 }
1844 bcopy(data,
1845 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1846 datalen);
1847 }
1848 controlp = &(*controlp)->m_next;
1849
1850 next:
1851 if (CMSG_SPACE(datalen) < clen) {
1852 clen -= CMSG_SPACE(datalen);
1853 cm = (struct cmsghdr *)
1854 ((caddr_t)cm + CMSG_SPACE(datalen));
1855 } else {
1856 clen = 0;
1857 cm = NULL;
1858 }
1859 }
1860
1861 m_freem(control);
1862 return (error);
1863 }
1864
1865 static void
1866 unp_zone_change(void *tag)
1867 {
1868
1869 uma_zone_set_max(unp_zone, maxsockets);
1870 }
1871
1872 static void
1873 unp_init(void)
1874 {
1875
1876 #ifdef VIMAGE
1877 if (!IS_DEFAULT_VNET(curvnet))
1878 return;
1879 #endif
1880 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1881 NULL, NULL, UMA_ALIGN_PTR, 0);
1882 if (unp_zone == NULL)
1883 panic("unp_init");
1884 uma_zone_set_max(unp_zone, maxsockets);
1885 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1886 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1887 NULL, EVENTHANDLER_PRI_ANY);
1888 LIST_INIT(&unp_dhead);
1889 LIST_INIT(&unp_shead);
1890 LIST_INIT(&unp_sphead);
1891 SLIST_INIT(&unp_defers);
1892 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1893 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1894 UNP_LINK_LOCK_INIT();
1895 UNP_LIST_LOCK_INIT();
1896 UNP_DEFERRED_LOCK_INIT();
1897 }
1898
1899 static int
1900 unp_internalize(struct mbuf **controlp, struct thread *td)
1901 {
1902 struct mbuf *control = *controlp;
1903 struct proc *p = td->td_proc;
1904 struct filedesc *fdesc = p->p_fd;
1905 struct bintime *bt;
1906 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1907 struct cmsgcred *cmcred;
1908 struct filedescent *fde, **fdep, *fdev;
1909 struct file *fp;
1910 struct timeval *tv;
1911 int i, *fdp;
1912 void *data;
1913 socklen_t clen = control->m_len, datalen;
1914 int error, oldfds;
1915 u_int newlen;
1916
1917 UNP_LINK_UNLOCK_ASSERT();
1918
1919 error = 0;
1920 *controlp = NULL;
1921 while (cm != NULL) {
1922 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1923 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
1924 error = EINVAL;
1925 goto out;
1926 }
1927 data = CMSG_DATA(cm);
1928 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1929
1930 switch (cm->cmsg_type) {
1931 /*
1932 * Fill in credential information.
1933 */
1934 case SCM_CREDS:
1935 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1936 SCM_CREDS, SOL_SOCKET);
1937 if (*controlp == NULL) {
1938 error = ENOBUFS;
1939 goto out;
1940 }
1941 cmcred = (struct cmsgcred *)
1942 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1943 cmcred->cmcred_pid = p->p_pid;
1944 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1945 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1946 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1947 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1948 CMGROUP_MAX);
1949 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1950 cmcred->cmcred_groups[i] =
1951 td->td_ucred->cr_groups[i];
1952 break;
1953
1954 case SCM_RIGHTS:
1955 oldfds = datalen / sizeof (int);
1956 if (oldfds == 0)
1957 break;
1958 /*
1959 * Check that all the FDs passed in refer to legal
1960 * files. If not, reject the entire operation.
1961 */
1962 fdp = data;
1963 FILEDESC_SLOCK(fdesc);
1964 for (i = 0; i < oldfds; i++, fdp++) {
1965 fp = fget_locked(fdesc, *fdp);
1966 if (fp == NULL) {
1967 FILEDESC_SUNLOCK(fdesc);
1968 error = EBADF;
1969 goto out;
1970 }
1971 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1972 FILEDESC_SUNLOCK(fdesc);
1973 error = EOPNOTSUPP;
1974 goto out;
1975 }
1976
1977 }
1978
1979 /*
1980 * Now replace the integer FDs with pointers to the
1981 * file structure and capability rights.
1982 */
1983 newlen = oldfds * sizeof(fdep[0]);
1984 *controlp = sbcreatecontrol(NULL, newlen,
1985 SCM_RIGHTS, SOL_SOCKET);
1986 if (*controlp == NULL) {
1987 FILEDESC_SUNLOCK(fdesc);
1988 error = E2BIG;
1989 goto out;
1990 }
1991 fdp = data;
1992 fdep = (struct filedescent **)
1993 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1994 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1995 M_WAITOK);
1996 for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1997 fde = &fdesc->fd_ofiles[*fdp];
1998 fdep[i] = fdev;
1999 fdep[i]->fde_file = fde->fde_file;
2000 filecaps_copy(&fde->fde_caps,
2001 &fdep[i]->fde_caps, true);
2002 unp_internalize_fp(fdep[i]->fde_file);
2003 }
2004 FILEDESC_SUNLOCK(fdesc);
2005 break;
2006
2007 case SCM_TIMESTAMP:
2008 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
2009 SCM_TIMESTAMP, SOL_SOCKET);
2010 if (*controlp == NULL) {
2011 error = ENOBUFS;
2012 goto out;
2013 }
2014 tv = (struct timeval *)
2015 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2016 microtime(tv);
2017 break;
2018
2019 case SCM_BINTIME:
2020 *controlp = sbcreatecontrol(NULL, sizeof(*bt),
2021 SCM_BINTIME, SOL_SOCKET);
2022 if (*controlp == NULL) {
2023 error = ENOBUFS;
2024 goto out;
2025 }
2026 bt = (struct bintime *)
2027 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2028 bintime(bt);
2029 break;
2030
2031 default:
2032 error = EINVAL;
2033 goto out;
2034 }
2035
2036 controlp = &(*controlp)->m_next;
2037 if (CMSG_SPACE(datalen) < clen) {
2038 clen -= CMSG_SPACE(datalen);
2039 cm = (struct cmsghdr *)
2040 ((caddr_t)cm + CMSG_SPACE(datalen));
2041 } else {
2042 clen = 0;
2043 cm = NULL;
2044 }
2045 }
2046
2047 out:
2048 m_freem(control);
2049 return (error);
2050 }
2051
2052 static struct mbuf *
2053 unp_addsockcred(struct thread *td, struct mbuf *control)
2054 {
2055 struct mbuf *m, *n, *n_prev;
2056 struct sockcred *sc;
2057 const struct cmsghdr *cm;
2058 int ngroups;
2059 int i;
2060
2061 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2062 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2063 if (m == NULL)
2064 return (control);
2065
2066 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2067 sc->sc_uid = td->td_ucred->cr_ruid;
2068 sc->sc_euid = td->td_ucred->cr_uid;
2069 sc->sc_gid = td->td_ucred->cr_rgid;
2070 sc->sc_egid = td->td_ucred->cr_gid;
2071 sc->sc_ngroups = ngroups;
2072 for (i = 0; i < sc->sc_ngroups; i++)
2073 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2074
2075 /*
2076 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2077 * created SCM_CREDS control message (struct sockcred) has another
2078 * format.
2079 */
2080 if (control != NULL)
2081 for (n = control, n_prev = NULL; n != NULL;) {
2082 cm = mtod(n, struct cmsghdr *);
2083 if (cm->cmsg_level == SOL_SOCKET &&
2084 cm->cmsg_type == SCM_CREDS) {
2085 if (n_prev == NULL)
2086 control = n->m_next;
2087 else
2088 n_prev->m_next = n->m_next;
2089 n = m_free(n);
2090 } else {
2091 n_prev = n;
2092 n = n->m_next;
2093 }
2094 }
2095
2096 /* Prepend it to the head. */
2097 m->m_next = control;
2098 return (m);
2099 }
2100
2101 static struct unpcb *
2102 fptounp(struct file *fp)
2103 {
2104 struct socket *so;
2105
2106 if (fp->f_type != DTYPE_SOCKET)
2107 return (NULL);
2108 if ((so = fp->f_data) == NULL)
2109 return (NULL);
2110 if (so->so_proto->pr_domain != &localdomain)
2111 return (NULL);
2112 return sotounpcb(so);
2113 }
2114
2115 static void
2116 unp_discard(struct file *fp)
2117 {
2118 struct unp_defer *dr;
2119
2120 if (unp_externalize_fp(fp)) {
2121 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2122 dr->ud_fp = fp;
2123 UNP_DEFERRED_LOCK();
2124 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2125 UNP_DEFERRED_UNLOCK();
2126 atomic_add_int(&unp_defers_count, 1);
2127 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2128 } else
2129 (void) closef(fp, (struct thread *)NULL);
2130 }
2131
2132 static void
2133 unp_process_defers(void *arg __unused, int pending)
2134 {
2135 struct unp_defer *dr;
2136 SLIST_HEAD(, unp_defer) drl;
2137 int count;
2138
2139 SLIST_INIT(&drl);
2140 for (;;) {
2141 UNP_DEFERRED_LOCK();
2142 if (SLIST_FIRST(&unp_defers) == NULL) {
2143 UNP_DEFERRED_UNLOCK();
2144 break;
2145 }
2146 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2147 UNP_DEFERRED_UNLOCK();
2148 count = 0;
2149 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2150 SLIST_REMOVE_HEAD(&drl, ud_link);
2151 closef(dr->ud_fp, NULL);
2152 free(dr, M_TEMP);
2153 count++;
2154 }
2155 atomic_add_int(&unp_defers_count, -count);
2156 }
2157 }
2158
2159 static void
2160 unp_internalize_fp(struct file *fp)
2161 {
2162 struct unpcb *unp;
2163
2164 UNP_LINK_WLOCK();
2165 if ((unp = fptounp(fp)) != NULL) {
2166 unp->unp_file = fp;
2167 unp->unp_msgcount++;
2168 }
2169 fhold(fp);
2170 unp_rights++;
2171 UNP_LINK_WUNLOCK();
2172 }
2173
2174 static int
2175 unp_externalize_fp(struct file *fp)
2176 {
2177 struct unpcb *unp;
2178 int ret;
2179
2180 UNP_LINK_WLOCK();
2181 if ((unp = fptounp(fp)) != NULL) {
2182 unp->unp_msgcount--;
2183 ret = 1;
2184 } else
2185 ret = 0;
2186 unp_rights--;
2187 UNP_LINK_WUNLOCK();
2188 return (ret);
2189 }
2190
2191 /*
2192 * unp_defer indicates whether additional work has been defered for a future
2193 * pass through unp_gc(). It is thread local and does not require explicit
2194 * synchronization.
2195 */
2196 static int unp_marked;
2197 static int unp_unreachable;
2198
2199 static void
2200 unp_accessable(struct filedescent **fdep, int fdcount)
2201 {
2202 struct unpcb *unp;
2203 struct file *fp;
2204 int i;
2205
2206 for (i = 0; i < fdcount; i++) {
2207 fp = fdep[i]->fde_file;
2208 if ((unp = fptounp(fp)) == NULL)
2209 continue;
2210 if (unp->unp_gcflag & UNPGC_REF)
2211 continue;
2212 unp->unp_gcflag &= ~UNPGC_DEAD;
2213 unp->unp_gcflag |= UNPGC_REF;
2214 unp_marked++;
2215 }
2216 }
2217
2218 static void
2219 unp_gc_process(struct unpcb *unp)
2220 {
2221 struct socket *soa;
2222 struct socket *so;
2223 struct file *fp;
2224
2225 /* Already processed. */
2226 if (unp->unp_gcflag & UNPGC_SCANNED)
2227 return;
2228 fp = unp->unp_file;
2229
2230 /*
2231 * Check for a socket potentially in a cycle. It must be in a
2232 * queue as indicated by msgcount, and this must equal the file
2233 * reference count. Note that when msgcount is 0 the file is NULL.
2234 */
2235 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2236 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2237 unp->unp_gcflag |= UNPGC_DEAD;
2238 unp_unreachable++;
2239 return;
2240 }
2241
2242 /*
2243 * Mark all sockets we reference with RIGHTS.
2244 */
2245 so = unp->unp_socket;
2246 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) {
2247 SOCKBUF_LOCK(&so->so_rcv);
2248 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2249 SOCKBUF_UNLOCK(&so->so_rcv);
2250 }
2251
2252 /*
2253 * Mark all sockets in our accept queue.
2254 */
2255 ACCEPT_LOCK();
2256 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2257 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0)
2258 continue;
2259 SOCKBUF_LOCK(&soa->so_rcv);
2260 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2261 SOCKBUF_UNLOCK(&soa->so_rcv);
2262 }
2263 ACCEPT_UNLOCK();
2264 unp->unp_gcflag |= UNPGC_SCANNED;
2265 }
2266
2267 static int unp_recycled;
2268 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2269 "Number of unreachable sockets claimed by the garbage collector.");
2270
2271 static int unp_taskcount;
2272 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2273 "Number of times the garbage collector has run.");
2274
2275 static void
2276 unp_gc(__unused void *arg, int pending)
2277 {
2278 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2279 NULL };
2280 struct unp_head **head;
2281 struct file *f, **unref;
2282 struct unpcb *unp;
2283 int i, total;
2284
2285 unp_taskcount++;
2286 UNP_LIST_LOCK();
2287 /*
2288 * First clear all gc flags from previous runs, apart from
2289 * UNPGC_IGNORE_RIGHTS.
2290 */
2291 for (head = heads; *head != NULL; head++)
2292 LIST_FOREACH(unp, *head, unp_link)
2293 unp->unp_gcflag =
2294 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS);
2295
2296 /*
2297 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2298 * is reachable all of the sockets it references are reachable.
2299 * Stop the scan once we do a complete loop without discovering
2300 * a new reachable socket.
2301 */
2302 do {
2303 unp_unreachable = 0;
2304 unp_marked = 0;
2305 for (head = heads; *head != NULL; head++)
2306 LIST_FOREACH(unp, *head, unp_link)
2307 unp_gc_process(unp);
2308 } while (unp_marked);
2309 UNP_LIST_UNLOCK();
2310 if (unp_unreachable == 0)
2311 return;
2312
2313 /*
2314 * Allocate space for a local list of dead unpcbs.
2315 */
2316 unref = malloc(unp_unreachable * sizeof(struct file *),
2317 M_TEMP, M_WAITOK);
2318
2319 /*
2320 * Iterate looking for sockets which have been specifically marked
2321 * as as unreachable and store them locally.
2322 */
2323 UNP_LINK_RLOCK();
2324 UNP_LIST_LOCK();
2325 for (total = 0, head = heads; *head != NULL; head++)
2326 LIST_FOREACH(unp, *head, unp_link)
2327 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2328 f = unp->unp_file;
2329 if (unp->unp_msgcount == 0 || f == NULL ||
2330 f->f_count != unp->unp_msgcount)
2331 continue;
2332 unref[total++] = f;
2333 fhold(f);
2334 KASSERT(total <= unp_unreachable,
2335 ("unp_gc: incorrect unreachable count."));
2336 }
2337 UNP_LIST_UNLOCK();
2338 UNP_LINK_RUNLOCK();
2339
2340 /*
2341 * Now flush all sockets, free'ing rights. This will free the
2342 * struct files associated with these sockets but leave each socket
2343 * with one remaining ref.
2344 */
2345 for (i = 0; i < total; i++) {
2346 struct socket *so;
2347
2348 so = unref[i]->f_data;
2349 CURVNET_SET(so->so_vnet);
2350 sorflush(so);
2351 CURVNET_RESTORE();
2352 }
2353
2354 /*
2355 * And finally release the sockets so they can be reclaimed.
2356 */
2357 for (i = 0; i < total; i++)
2358 fdrop(unref[i], NULL);
2359 unp_recycled += total;
2360 free(unref, M_TEMP);
2361 }
2362
2363 static void
2364 unp_dispose(struct mbuf *m)
2365 {
2366
2367 if (m)
2368 unp_scan(m, unp_freerights);
2369 }
2370
2371 /*
2372 * Synchronize against unp_gc, which can trip over data as we are freeing it.
2373 */
2374 static void
2375 unp_dispose_so(struct socket *so)
2376 {
2377 struct unpcb *unp;
2378
2379 unp = sotounpcb(so);
2380 UNP_LIST_LOCK();
2381 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
2382 UNP_LIST_UNLOCK();
2383 unp_dispose(so->so_rcv.sb_mb);
2384 }
2385
2386 static void
2387 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2388 {
2389 struct mbuf *m;
2390 struct cmsghdr *cm;
2391 void *data;
2392 socklen_t clen, datalen;
2393
2394 while (m0 != NULL) {
2395 for (m = m0; m; m = m->m_next) {
2396 if (m->m_type != MT_CONTROL)
2397 continue;
2398
2399 cm = mtod(m, struct cmsghdr *);
2400 clen = m->m_len;
2401
2402 while (cm != NULL) {
2403 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2404 break;
2405
2406 data = CMSG_DATA(cm);
2407 datalen = (caddr_t)cm + cm->cmsg_len
2408 - (caddr_t)data;
2409
2410 if (cm->cmsg_level == SOL_SOCKET &&
2411 cm->cmsg_type == SCM_RIGHTS) {
2412 (*op)(data, datalen /
2413 sizeof(struct filedescent *));
2414 }
2415
2416 if (CMSG_SPACE(datalen) < clen) {
2417 clen -= CMSG_SPACE(datalen);
2418 cm = (struct cmsghdr *)
2419 ((caddr_t)cm + CMSG_SPACE(datalen));
2420 } else {
2421 clen = 0;
2422 cm = NULL;
2423 }
2424 }
2425 }
2426 m0 = m0->m_nextpkt;
2427 }
2428 }
2429
2430 /*
2431 * A helper function called by VFS before socket-type vnode reclamation.
2432 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2433 * use count.
2434 */
2435 void
2436 vfs_unp_reclaim(struct vnode *vp)
2437 {
2438 struct socket *so;
2439 struct unpcb *unp;
2440 int active;
2441
2442 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2443 KASSERT(vp->v_type == VSOCK,
2444 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2445
2446 active = 0;
2447 UNP_LINK_WLOCK();
2448 VOP_UNP_CONNECT(vp, &so);
2449 if (so == NULL)
2450 goto done;
2451 unp = sotounpcb(so);
2452 if (unp == NULL)
2453 goto done;
2454 UNP_PCB_LOCK(unp);
2455 if (unp->unp_vnode == vp) {
2456 VOP_UNP_DETACH(vp);
2457 unp->unp_vnode = NULL;
2458 active = 1;
2459 }
2460 UNP_PCB_UNLOCK(unp);
2461 done:
2462 UNP_LINK_WUNLOCK();
2463 if (active)
2464 vunref(vp);
2465 }
2466
2467 #ifdef DDB
2468 static void
2469 db_print_indent(int indent)
2470 {
2471 int i;
2472
2473 for (i = 0; i < indent; i++)
2474 db_printf(" ");
2475 }
2476
2477 static void
2478 db_print_unpflags(int unp_flags)
2479 {
2480 int comma;
2481
2482 comma = 0;
2483 if (unp_flags & UNP_HAVEPC) {
2484 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2485 comma = 1;
2486 }
2487 if (unp_flags & UNP_HAVEPCCACHED) {
2488 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2489 comma = 1;
2490 }
2491 if (unp_flags & UNP_WANTCRED) {
2492 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2493 comma = 1;
2494 }
2495 if (unp_flags & UNP_CONNWAIT) {
2496 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2497 comma = 1;
2498 }
2499 if (unp_flags & UNP_CONNECTING) {
2500 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2501 comma = 1;
2502 }
2503 if (unp_flags & UNP_BINDING) {
2504 db_printf("%sUNP_BINDING", comma ? ", " : "");
2505 comma = 1;
2506 }
2507 }
2508
2509 static void
2510 db_print_xucred(int indent, struct xucred *xu)
2511 {
2512 int comma, i;
2513
2514 db_print_indent(indent);
2515 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2516 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2517 db_print_indent(indent);
2518 db_printf("cr_groups: ");
2519 comma = 0;
2520 for (i = 0; i < xu->cr_ngroups; i++) {
2521 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2522 comma = 1;
2523 }
2524 db_printf("\n");
2525 }
2526
2527 static void
2528 db_print_unprefs(int indent, struct unp_head *uh)
2529 {
2530 struct unpcb *unp;
2531 int counter;
2532
2533 counter = 0;
2534 LIST_FOREACH(unp, uh, unp_reflink) {
2535 if (counter % 4 == 0)
2536 db_print_indent(indent);
2537 db_printf("%p ", unp);
2538 if (counter % 4 == 3)
2539 db_printf("\n");
2540 counter++;
2541 }
2542 if (counter != 0 && counter % 4 != 0)
2543 db_printf("\n");
2544 }
2545
2546 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2547 {
2548 struct unpcb *unp;
2549
2550 if (!have_addr) {
2551 db_printf("usage: show unpcb <addr>\n");
2552 return;
2553 }
2554 unp = (struct unpcb *)addr;
2555
2556 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2557 unp->unp_vnode);
2558
2559 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2560 unp->unp_conn);
2561
2562 db_printf("unp_refs:\n");
2563 db_print_unprefs(2, &unp->unp_refs);
2564
2565 /* XXXRW: Would be nice to print the full address, if any. */
2566 db_printf("unp_addr: %p\n", unp->unp_addr);
2567
2568 db_printf("unp_gencnt: %llu\n",
2569 (unsigned long long)unp->unp_gencnt);
2570
2571 db_printf("unp_flags: %x (", unp->unp_flags);
2572 db_print_unpflags(unp->unp_flags);
2573 db_printf(")\n");
2574
2575 db_printf("unp_peercred:\n");
2576 db_print_xucred(2, &unp->unp_peercred);
2577
2578 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2579 }
2580 #endif
Cache object: dde21ce61833b2a5c9cefcd540b26204
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