FreeBSD kernel kern code
uipc_usrreq.c
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1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1991, 1993
5 * The Regents of the University of California. All Rights Reserved.
6 * Copyright (c) 2004-2009 Robert N. M. Watson All Rights Reserved.
7 * Copyright (c) 2018 Matthew Macy
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
34 */
35
36/*
37 * UNIX Domain (Local) Sockets
38 *
39 * This is an implementation of UNIX (local) domain sockets. Each socket has
40 * an associated struct unpcb (UNIX protocol control block). Stream sockets
41 * may be connected to 0 or 1 other socket. Datagram sockets may be
42 * connected to 0, 1, or many other sockets. Sockets may be created and
43 * connected in pairs (socketpair(2)), or bound/connected to using the file
44 * system name space. For most purposes, only the receive socket buffer is
45 * used, as sending on one socket delivers directly to the receive socket
46 * buffer of a second socket.
47 *
48 * The implementation is substantially complicated by the fact that
49 * "ancillary data", such as file descriptors or credentials, may be passed
50 * across UNIX domain sockets. The potential for passing UNIX domain sockets
51 * over other UNIX domain sockets requires the implementation of a simple
52 * garbage collector to find and tear down cycles of disconnected sockets.
53 *
54 * TODO:
55 * RDM
56 * rethink name space problems
57 * need a proper out-of-band
58 */
59
60#include <sys/cdefs.h>
61__FBSDID("$FreeBSD$");
62
63#include "opt_ddb.h"
64
65#include <sys/param.h>
66#include <sys/capsicum.h>
67#include <sys/domain.h>
68#include <sys/eventhandler.h>
69#include <sys/fcntl.h>
70#include <sys/file.h>
71#include <sys/filedesc.h>
72#include <sys/kernel.h>
73#include <sys/lock.h>
74#include <sys/malloc.h>
75#include <sys/mbuf.h>
76#include <sys/mount.h>
77#include <sys/mutex.h>
78#include <sys/namei.h>
79#include <sys/proc.h>
80#include <sys/protosw.h>
81#include <sys/queue.h>
82#include <sys/resourcevar.h>
83#include <sys/rwlock.h>
84#include <sys/socket.h>
85#include <sys/socketvar.h>
86#include <sys/signalvar.h>
87#include <sys/stat.h>
88#include <sys/sx.h>
89#include <sys/sysctl.h>
90#include <sys/systm.h>
91#include <sys/taskqueue.h>
92#include <sys/un.h>
93#include <sys/unpcb.h>
94#include <sys/vnode.h>
95
96#include <net/vnet.h>
97
98#ifdef DDB
99#include <ddb/ddb.h>
100#endif
101
102#include <security/mac/mac_framework.h>
103
104#include <vm/uma.h>
105
106MALLOC_DECLARE(M_FILECAPS);
107
108/*
109 * See unpcb.h for the locking key.
110 */
111
112static uma_zone_t unp_zone;
113static unp_gen_t unp_gencnt; /* (l) */
114static u_int unp_count; /* (l) Count of local sockets. */
115static ino_t unp_ino; /* Prototype for fake inode numbers. */
116static int unp_rights; /* (g) File descriptors in flight. */
117static struct unp_head unp_shead; /* (l) List of stream sockets. */
118static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
119static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
120
121struct unp_defer {
122 SLIST_ENTRY(unp_defer) ud_link;
123 struct file *ud_fp;
124};
125static SLIST_HEAD(, unp_defer) unp_defers;
126static int unp_defers_count;
127
128static 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 */
136static 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 */
143static 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
157static u_long unpst_sendspace = PIPSIZ;
158static u_long unpst_recvspace = PIPSIZ;
159static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
160static u_long unpdg_recvspace = 16*1024; /* support 8KB syslog msgs */
161static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
162static u_long unpsp_recvspace = PIPSIZ;
163
164static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
165 "Local domain");
166static SYSCTL_NODE(_net_local, SOCK_STREAM, stream,
167 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
168 "SOCK_STREAM");
169static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram,
170 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
171 "SOCK_DGRAM");
172static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket,
173 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
174 "SOCK_SEQPACKET");
175
176SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
177 &unpst_sendspace, 0, "Default stream send space.");
178SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
179 &unpst_recvspace, 0, "Default stream receive space.");
180SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
181 &unpdg_sendspace, 0, "Default datagram send space.");
182SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
183 &unpdg_recvspace, 0, "Default datagram receive space.");
184SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
185 &unpsp_sendspace, 0, "Default seqpacket send space.");
186SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
187 &unpsp_recvspace, 0, "Default seqpacket receive space.");
188SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
189 "File descriptors in flight.");
190SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
191 &unp_defers_count, 0,
192 "File descriptors deferred to taskqueue for close.");
193
194/*
195 * Locking and synchronization:
196 *
197 * Several types of locks exist in the local domain socket implementation:
198 * - a global linkage lock
199 * - a global connection list lock
200 * - the mtxpool lock
201 * - per-unpcb mutexes
202 *
203 * The linkage lock protects the global socket lists, the generation number
204 * counter and garbage collector state.
205 *
206 * The connection list lock protects the list of referring sockets in a datagram
207 * socket PCB. This lock is also overloaded to protect a global list of
208 * sockets whose buffers contain socket references in the form of SCM_RIGHTS
209 * messages. To avoid recursion, such references are released by a dedicated
210 * thread.
211 *
212 * The mtxpool lock protects the vnode from being modified while referenced.
213 * Lock ordering rules require that it be acquired before any PCB locks.
214 *
215 * The unpcb lock (unp_mtx) protects the most commonly referenced fields in the
216 * unpcb. This includes the unp_conn field, which either links two connected
217 * PCBs together (for connected socket types) or points at the destination
218 * socket (for connectionless socket types). The operations of creating or
219 * destroying a connection therefore involve locking multiple PCBs. To avoid
220 * lock order reversals, in some cases this involves dropping a PCB lock and
221 * using a reference counter to maintain liveness.
222 *
223 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
224 * allocated in pru_attach() and freed in pru_detach(). The validity of that
225 * pointer is an invariant, so no lock is required to dereference the so_pcb
226 * pointer if a valid socket reference is held by the caller. In practice,
227 * this is always true during operations performed on a socket. Each unpcb
228 * has a back-pointer to its socket, unp_socket, which will be stable under
229 * the same circumstances.
230 *
231 * This pointer may only be safely dereferenced as long as a valid reference
232 * to the unpcb is held. Typically, this reference will be from the socket,
233 * or from another unpcb when the referring unpcb's lock is held (in order
234 * that the reference not be invalidated during use). For example, to follow
235 * unp->unp_conn->unp_socket, you need to hold a lock on unp_conn to guarantee
236 * that detach is not run clearing unp_socket.
237 *
238 * Blocking with UNIX domain sockets is a tricky issue: unlike most network
239 * protocols, bind() is a non-atomic operation, and connect() requires
240 * potential sleeping in the protocol, due to potentially waiting on local or
241 * distributed file systems. We try to separate "lookup" operations, which
242 * may sleep, and the IPC operations themselves, which typically can occur
243 * with relative atomicity as locks can be held over the entire operation.
244 *
245 * Another tricky issue is simultaneous multi-threaded or multi-process
246 * access to a single UNIX domain socket. These are handled by the flags
247 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
248 * binding, both of which involve dropping UNIX domain socket locks in order
249 * to perform namei() and other file system operations.
250 */
251static struct rwlock unp_link_rwlock;
252static struct mtx unp_defers_lock;
253
254#define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
255 "unp_link_rwlock")
256
257#define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
258 RA_LOCKED)
259#define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
260 RA_UNLOCKED)
261
262#define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
263#define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
264#define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
265#define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
266#define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
267 RA_WLOCKED)
268#define UNP_LINK_WOWNED() rw_wowned(&unp_link_rwlock)
269
270#define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
271 "unp_defer", NULL, MTX_DEF)
272#define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
273#define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
274
275#define UNP_REF_LIST_LOCK() UNP_DEFERRED_LOCK();
276#define UNP_REF_LIST_UNLOCK() UNP_DEFERRED_UNLOCK();
277
278#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
279 "unp", "unp", \
280 MTX_DUPOK|MTX_DEF)
281#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
282#define UNP_PCB_LOCKPTR(unp) (&(unp)->unp_mtx)
283#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
284#define UNP_PCB_TRYLOCK(unp) mtx_trylock(&(unp)->unp_mtx)
285#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
286#define UNP_PCB_OWNED(unp) mtx_owned(&(unp)->unp_mtx)
287#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
288#define UNP_PCB_UNLOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_NOTOWNED)
289
290static int uipc_connect2(struct socket *, struct socket *);
291static int uipc_ctloutput(struct socket *, struct sockopt *);
292static int unp_connect(struct socket *, struct sockaddr *,
293 struct thread *);
294static int unp_connectat(int, struct socket *, struct sockaddr *,
295 struct thread *);
296static int unp_connect2(struct socket *so, struct socket *so2, int);
297static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
298static void unp_dispose(struct socket *so);
299static void unp_dispose_mbuf(struct mbuf *);
300static void unp_shutdown(struct unpcb *);
301static void unp_drop(struct unpcb *);
302static void unp_gc(__unused void *, int);
303static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
304static void unp_discard(struct file *);
305static void unp_freerights(struct filedescent **, int);
306static int unp_internalize(struct mbuf **, struct thread *);
307static void unp_internalize_fp(struct file *);
308static int unp_externalize(struct mbuf *, struct mbuf **, int);
309static int unp_externalize_fp(struct file *);
310static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *, int);
311static void unp_process_defers(void * __unused, int);
312
313static void
314unp_pcb_hold(struct unpcb *unp)
315{
316 u_int old __unused;
317
318 old = refcount_acquire(&unp->unp_refcount);
319 KASSERT(old > 0, ("%s: unpcb %p has no references", __func__, unp));
320}
321
322static __result_use_check bool
323unp_pcb_rele(struct unpcb *unp)
324{
325 bool ret;
326
327 UNP_PCB_LOCK_ASSERT(unp);
328
329 if ((ret = refcount_release(&unp->unp_refcount))) {
330 UNP_PCB_UNLOCK(unp);
331 UNP_PCB_LOCK_DESTROY(unp);
332 uma_zfree(unp_zone, unp);
333 }
334 return (ret);
335}
336
337static void
338unp_pcb_rele_notlast(struct unpcb *unp)
339{
340 bool ret __unused;
341
342 ret = refcount_release(&unp->unp_refcount);
343 KASSERT(!ret, ("%s: unpcb %p has no references", __func__, unp));
344}
345
346static void
347unp_pcb_lock_pair(struct unpcb *unp, struct unpcb *unp2)
348{
349 UNP_PCB_UNLOCK_ASSERT(unp);
350 UNP_PCB_UNLOCK_ASSERT(unp2);
351
352 if (unp == unp2) {
353 UNP_PCB_LOCK(unp);
354 } else if ((uintptr_t)unp2 > (uintptr_t)unp) {
355 UNP_PCB_LOCK(unp);
356 UNP_PCB_LOCK(unp2);
357 } else {
358 UNP_PCB_LOCK(unp2);
359 UNP_PCB_LOCK(unp);
360 }
361}
362
363static void
364unp_pcb_unlock_pair(struct unpcb *unp, struct unpcb *unp2)
365{
366 UNP_PCB_UNLOCK(unp);
367 if (unp != unp2)
368 UNP_PCB_UNLOCK(unp2);
369}
370
371/*
372 * Try to lock the connected peer of an already locked socket. In some cases
373 * this requires that we unlock the current socket. The pairbusy counter is
374 * used to block concurrent connection attempts while the lock is dropped. The
375 * caller must be careful to revalidate PCB state.
376 */
377static struct unpcb *
378unp_pcb_lock_peer(struct unpcb *unp)
379{
380 struct unpcb *unp2;
381
382 UNP_PCB_LOCK_ASSERT(unp);
383 unp2 = unp->unp_conn;
384 if (unp2 == NULL)
385 return (NULL);
386 if (__predict_false(unp == unp2))
387 return (unp);
388
389 UNP_PCB_UNLOCK_ASSERT(unp2);
390
391 if (__predict_true(UNP_PCB_TRYLOCK(unp2)))
392 return (unp2);
393 if ((uintptr_t)unp2 > (uintptr_t)unp) {
394 UNP_PCB_LOCK(unp2);
395 return (unp2);
396 }
397 unp->unp_pairbusy++;
398 unp_pcb_hold(unp2);
399 UNP_PCB_UNLOCK(unp);
400
401 UNP_PCB_LOCK(unp2);
402 UNP_PCB_LOCK(unp);
403 KASSERT(unp->unp_conn == unp2 || unp->unp_conn == NULL,
404 ("%s: socket %p was reconnected", __func__, unp));
405 if (--unp->unp_pairbusy == 0 && (unp->unp_flags & UNP_WAITING) != 0) {
406 unp->unp_flags &= ~UNP_WAITING;
407 wakeup(unp);
408 }
409 if (unp_pcb_rele(unp2)) {
410 /* unp2 is unlocked. */
411 return (NULL);
412 }
413 if (unp->unp_conn == NULL) {
414 UNP_PCB_UNLOCK(unp2);
415 return (NULL);
416 }
417 return (unp2);
418}
419
420/*
421 * Definitions of protocols supported in the LOCAL domain.
422 */
423static struct domain localdomain;
424static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
425static struct pr_usrreqs uipc_usrreqs_seqpacket;
426static struct protosw localsw[] = {
427{
428 .pr_type = SOCK_STREAM,
429 .pr_domain = &localdomain,
430 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS|
431 PR_CAPATTACH,
432 .pr_ctloutput = &uipc_ctloutput,
433 .pr_usrreqs = &uipc_usrreqs_stream
434},
435{
436 .pr_type = SOCK_DGRAM,
437 .pr_domain = &localdomain,
438 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS|PR_CAPATTACH,
439 .pr_ctloutput = &uipc_ctloutput,
440 .pr_usrreqs = &uipc_usrreqs_dgram
441},
442{
443 .pr_type = SOCK_SEQPACKET,
444 .pr_domain = &localdomain,
445
446 /*
447 * XXXRW: For now, PR_ADDR because soreceive will bump into them
448 * due to our use of sbappendaddr. A new sbappend variants is needed
449 * that supports both atomic record writes and control data.
450 */
451 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|
452 PR_WANTRCVD|PR_RIGHTS|PR_CAPATTACH,
453 .pr_ctloutput = &uipc_ctloutput,
454 .pr_usrreqs = &uipc_usrreqs_seqpacket,
455},
456};
457
458static struct domain localdomain = {
459 .dom_family = AF_LOCAL,
460 .dom_name = "local",
461 .dom_externalize = unp_externalize,
462 .dom_dispose = unp_dispose,
463 .dom_protosw = localsw,
464 .dom_protoswNPROTOSW = &localsw[nitems(localsw)]
465};
466DOMAIN_SET(local);
467
468static void
469uipc_abort(struct socket *so)
470{
471 struct unpcb *unp, *unp2;
472
473 unp = sotounpcb(so);
474 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
475 UNP_PCB_UNLOCK_ASSERT(unp);
476
477 UNP_PCB_LOCK(unp);
478 unp2 = unp->unp_conn;
479 if (unp2 != NULL) {
480 unp_pcb_hold(unp2);
481 UNP_PCB_UNLOCK(unp);
482 unp_drop(unp2);
483 } else
484 UNP_PCB_UNLOCK(unp);
485}
486
487static int
488uipc_accept(struct socket *so, struct sockaddr **nam)
489{
490 struct unpcb *unp, *unp2;
491 const struct sockaddr *sa;
492
493 /*
494 * Pass back name of connected socket, if it was bound and we are
495 * still connected (our peer may have closed already!).
496 */
497 unp = sotounpcb(so);
498 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
499
500 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
501 UNP_PCB_LOCK(unp);
502 unp2 = unp_pcb_lock_peer(unp);
503 if (unp2 != NULL && unp2->unp_addr != NULL)
504 sa = (struct sockaddr *)unp2->unp_addr;
505 else
506 sa = &sun_noname;
507 bcopy(sa, *nam, sa->sa_len);
508 if (unp2 != NULL)
509 unp_pcb_unlock_pair(unp, unp2);
510 else
511 UNP_PCB_UNLOCK(unp);
512 return (0);
513}
514
515static int
516uipc_attach(struct socket *so, int proto, struct thread *td)
517{
518 u_long sendspace, recvspace;
519 struct unpcb *unp;
520 int error;
521 bool locked;
522
523 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
524 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
525 switch (so->so_type) {
526 case SOCK_STREAM:
527 sendspace = unpst_sendspace;
528 recvspace = unpst_recvspace;
529 break;
530
531 case SOCK_DGRAM:
532 sendspace = unpdg_sendspace;
533 recvspace = unpdg_recvspace;
534 break;
535
536 case SOCK_SEQPACKET:
537 sendspace = unpsp_sendspace;
538 recvspace = unpsp_recvspace;
539 break;
540
541 default:
542 panic("uipc_attach");
543 }
544 error = soreserve(so, sendspace, recvspace);
545 if (error)
546 return (error);
547 }
548 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
549 if (unp == NULL)
550 return (ENOBUFS);
551 LIST_INIT(&unp->unp_refs);
552 UNP_PCB_LOCK_INIT(unp);
553 unp->unp_socket = so;
554 so->so_pcb = unp;
555 refcount_init(&unp->unp_refcount, 1);
556
557 if ((locked = UNP_LINK_WOWNED()) == false)
558 UNP_LINK_WLOCK();
559
560 unp->unp_gencnt = ++unp_gencnt;
561 unp->unp_ino = ++unp_ino;
562 unp_count++;
563 switch (so->so_type) {
564 case SOCK_STREAM:
565 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
566 break;
567
568 case SOCK_DGRAM:
569 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
570 break;
571
572 case SOCK_SEQPACKET:
573 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
574 break;
575
576 default:
577 panic("uipc_attach");
578 }
579
580 if (locked == false)
581 UNP_LINK_WUNLOCK();
582
583 return (0);
584}
585
586static int
587uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
588{
589 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
590 struct vattr vattr;
591 int error, namelen;
592 struct nameidata nd;
593 struct unpcb *unp;
594 struct vnode *vp;
595 struct mount *mp;
596 cap_rights_t rights;
597 char *buf;
598
599 if (nam->sa_family != AF_UNIX)
600 return (EAFNOSUPPORT);
601
602 unp = sotounpcb(so);
603 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
604
605 if (soun->sun_len > sizeof(struct sockaddr_un))
606 return (EINVAL);
607 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
608 if (namelen <= 0)
609 return (EINVAL);
610
611 /*
612 * We don't allow simultaneous bind() calls on a single UNIX domain
613 * socket, so flag in-progress operations, and return an error if an
614 * operation is already in progress.
615 *
616 * Historically, we have not allowed a socket to be rebound, so this
617 * also returns an error. Not allowing re-binding simplifies the
618 * implementation and avoids a great many possible failure modes.
619 */
620 UNP_PCB_LOCK(unp);
621 if (unp->unp_vnode != NULL) {
622 UNP_PCB_UNLOCK(unp);
623 return (EINVAL);
624 }
625 if (unp->unp_flags & UNP_BINDING) {
626 UNP_PCB_UNLOCK(unp);
627 return (EALREADY);
628 }
629 unp->unp_flags |= UNP_BINDING;
630 UNP_PCB_UNLOCK(unp);
631
632 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
633 bcopy(soun->sun_path, buf, namelen);
634 buf[namelen] = 0;
635
636restart:
637 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE,
638 UIO_SYSSPACE, buf, fd, cap_rights_init_one(&rights, CAP_BINDAT));
639/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
640 error = namei(&nd);
641 if (error)
642 goto error;
643 vp = nd.ni_vp;
644 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
645 NDFREE(&nd, NDF_ONLY_PNBUF);
646 if (nd.ni_dvp == vp)
647 vrele(nd.ni_dvp);
648 else
649 vput(nd.ni_dvp);
650 if (vp != NULL) {
651 vrele(vp);
652 error = EADDRINUSE;
653 goto error;
654 }
655 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
656 if (error)
657 goto error;
658 goto restart;
659 }
660 VATTR_NULL(&vattr);
661 vattr.va_type = VSOCK;
662 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_pd->pd_cmask);
663#ifdef MAC
664 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
665 &vattr);
666#endif
667 if (error == 0)
668 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
669 NDFREE(&nd, NDF_ONLY_PNBUF);
670 if (error) {
671 VOP_VPUT_PAIR(nd.ni_dvp, NULL, true);
672 vn_finished_write(mp);
673 if (error == ERELOOKUP)
674 goto restart;
675 goto error;
676 }
677 vp = nd.ni_vp;
678 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
679 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
680
681 UNP_PCB_LOCK(unp);
682 VOP_UNP_BIND(vp, unp);
683 unp->unp_vnode = vp;
684 unp->unp_addr = soun;
685 unp->unp_flags &= ~UNP_BINDING;
686 UNP_PCB_UNLOCK(unp);
687 vref(vp);
688 VOP_VPUT_PAIR(nd.ni_dvp, &vp, true);
689 vn_finished_write(mp);
690 free(buf, M_TEMP);
691 return (0);
692
693error:
694 UNP_PCB_LOCK(unp);
695 unp->unp_flags &= ~UNP_BINDING;
696 UNP_PCB_UNLOCK(unp);
697 free(buf, M_TEMP);
698 return (error);
699}
700
701static int
702uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
703{
704
705 return (uipc_bindat(AT_FDCWD, so, nam, td));
706}
707
708static int
709uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
710{
711 int error;
712
713 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
714 error = unp_connect(so, nam, td);
715 return (error);
716}
717
718static int
719uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
720 struct thread *td)
721{
722 int error;
723
724 KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
725 error = unp_connectat(fd, so, nam, td);
726 return (error);
727}
728
729static void
730uipc_close(struct socket *so)
731{
732 struct unpcb *unp, *unp2;
733 struct vnode *vp = NULL;
734 struct mtx *vplock;
735
736 unp = sotounpcb(so);
737 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
738
739 vplock = NULL;
740 if ((vp = unp->unp_vnode) != NULL) {
741 vplock = mtx_pool_find(mtxpool_sleep, vp);
742 mtx_lock(vplock);
743 }
744 UNP_PCB_LOCK(unp);
745 if (vp && unp->unp_vnode == NULL) {
746 mtx_unlock(vplock);
747 vp = NULL;
748 }
749 if (vp != NULL) {
750 VOP_UNP_DETACH(vp);
751 unp->unp_vnode = NULL;
752 }
753 if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
754 unp_disconnect(unp, unp2);
755 else
756 UNP_PCB_UNLOCK(unp);
757 if (vp) {
758 mtx_unlock(vplock);
759 vrele(vp);
760 }
761}
762
763static int
764uipc_connect2(struct socket *so1, struct socket *so2)
765{
766 struct unpcb *unp, *unp2;
767 int error;
768
769 unp = so1->so_pcb;
770 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
771 unp2 = so2->so_pcb;
772 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
773 unp_pcb_lock_pair(unp, unp2);
774 error = unp_connect2(so1, so2, PRU_CONNECT2);
775 unp_pcb_unlock_pair(unp, unp2);
776 return (error);
777}
778
779static void
780uipc_detach(struct socket *so)
781{
782 struct unpcb *unp, *unp2;
783 struct mtx *vplock;
784 struct vnode *vp;
785 int local_unp_rights;
786
787 unp = sotounpcb(so);
788 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
789
790 vp = NULL;
791 vplock = NULL;
792
793 SOCK_LOCK(so);
794 if (!SOLISTENING(so)) {
795 /*
796 * Once the socket is removed from the global lists,
797 * uipc_ready() will not be able to locate its socket buffer, so
798 * clear the buffer now. At this point internalized rights have
799 * already been disposed of.
800 */
801 sbrelease(&so->so_rcv, so);
802 }
803 SOCK_UNLOCK(so);
804
805 UNP_LINK_WLOCK();
806 LIST_REMOVE(unp, unp_link);
807 if (unp->unp_gcflag & UNPGC_DEAD)
808 LIST_REMOVE(unp, unp_dead);
809 unp->unp_gencnt = ++unp_gencnt;
810 --unp_count;
811 UNP_LINK_WUNLOCK();
812
813 UNP_PCB_UNLOCK_ASSERT(unp);
814 restart:
815 if ((vp = unp->unp_vnode) != NULL) {
816 vplock = mtx_pool_find(mtxpool_sleep, vp);
817 mtx_lock(vplock);
818 }
819 UNP_PCB_LOCK(unp);
820 if (unp->unp_vnode != vp && unp->unp_vnode != NULL) {
821 if (vplock)
822 mtx_unlock(vplock);
823 UNP_PCB_UNLOCK(unp);
824 goto restart;
825 }
826 if ((vp = unp->unp_vnode) != NULL) {
827 VOP_UNP_DETACH(vp);
828 unp->unp_vnode = NULL;
829 }
830 if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
831 unp_disconnect(unp, unp2);
832 else
833 UNP_PCB_UNLOCK(unp);
834
835 UNP_REF_LIST_LOCK();
836 while (!LIST_EMPTY(&unp->unp_refs)) {
837 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
838
839 unp_pcb_hold(ref);
840 UNP_REF_LIST_UNLOCK();
841
842 MPASS(ref != unp);
843 UNP_PCB_UNLOCK_ASSERT(ref);
844 unp_drop(ref);
845 UNP_REF_LIST_LOCK();
846 }
847 UNP_REF_LIST_UNLOCK();
848
849 UNP_PCB_LOCK(unp);
850 local_unp_rights = unp_rights;
851 unp->unp_socket->so_pcb = NULL;
852 unp->unp_socket = NULL;
853 free(unp->unp_addr, M_SONAME);
854 unp->unp_addr = NULL;
855 if (!unp_pcb_rele(unp))
856 UNP_PCB_UNLOCK(unp);
857 if (vp) {
858 mtx_unlock(vplock);
859 vrele(vp);
860 }
861 if (local_unp_rights)
862 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
863}
864
865static int
866uipc_disconnect(struct socket *so)
867{
868 struct unpcb *unp, *unp2;
869
870 unp = sotounpcb(so);
871 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
872
873 UNP_PCB_LOCK(unp);
874 if ((unp2 = unp_pcb_lock_peer(unp)) != NULL)
875 unp_disconnect(unp, unp2);
876 else
877 UNP_PCB_UNLOCK(unp);
878 return (0);
879}
880
881static int
882uipc_listen(struct socket *so, int backlog, struct thread *td)
883{
884 struct unpcb *unp;
885 int error;
886
887 if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
888 return (EOPNOTSUPP);
889
890 /*
891 * Synchronize with concurrent connection attempts.
892 */
893 error = 0;
894 unp = sotounpcb(so);
895 UNP_PCB_LOCK(unp);
896 if (unp->unp_conn != NULL || (unp->unp_flags & UNP_CONNECTING) != 0)
897 error = EINVAL;
898 else if (unp->unp_vnode == NULL)
899 error = EDESTADDRREQ;
900 if (error != 0) {
901 UNP_PCB_UNLOCK(unp);
902 return (error);
903 }
904
905 SOCK_LOCK(so);
906 error = solisten_proto_check(so);
907 if (error == 0) {
908 cru2xt(td, &unp->unp_peercred);
909 solisten_proto(so, backlog);
910 }
911 SOCK_UNLOCK(so);
912 UNP_PCB_UNLOCK(unp);
913 return (error);
914}
915
916static int
917uipc_peeraddr(struct socket *so, struct sockaddr **nam)
918{
919 struct unpcb *unp, *unp2;
920 const struct sockaddr *sa;
921
922 unp = sotounpcb(so);
923 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
924
925 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
926 UNP_LINK_RLOCK();
927 /*
928 * XXX: It seems that this test always fails even when connection is
929 * established. So, this else clause is added as workaround to
930 * return PF_LOCAL sockaddr.
931 */
932 unp2 = unp->unp_conn;
933 if (unp2 != NULL) {
934 UNP_PCB_LOCK(unp2);
935 if (unp2->unp_addr != NULL)
936 sa = (struct sockaddr *) unp2->unp_addr;
937 else
938 sa = &sun_noname;
939 bcopy(sa, *nam, sa->sa_len);
940 UNP_PCB_UNLOCK(unp2);
941 } else {
942 sa = &sun_noname;
943 bcopy(sa, *nam, sa->sa_len);
944 }
945 UNP_LINK_RUNLOCK();
946 return (0);
947}
948
949static int
950uipc_rcvd(struct socket *so, int flags)
951{
952 struct unpcb *unp, *unp2;
953 struct socket *so2;
954 u_int mbcnt, sbcc;
955
956 unp = sotounpcb(so);
957 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
958 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
959 ("%s: socktype %d", __func__, so->so_type));
960
961 /*
962 * Adjust backpressure on sender and wakeup any waiting to write.
963 *
964 * The unp lock is acquired to maintain the validity of the unp_conn
965 * pointer; no lock on unp2 is required as unp2->unp_socket will be
966 * static as long as we don't permit unp2 to disconnect from unp,
967 * which is prevented by the lock on unp. We cache values from
968 * so_rcv to avoid holding the so_rcv lock over the entire
969 * transaction on the remote so_snd.
970 */
971 SOCKBUF_LOCK(&so->so_rcv);
972 mbcnt = so->so_rcv.sb_mbcnt;
973 sbcc = sbavail(&so->so_rcv);
974 SOCKBUF_UNLOCK(&so->so_rcv);
975 /*
976 * There is a benign race condition at this point. If we're planning to
977 * clear SB_STOP, but uipc_send is called on the connected socket at
978 * this instant, it might add data to the sockbuf and set SB_STOP. Then
979 * we would erroneously clear SB_STOP below, even though the sockbuf is
980 * full. The race is benign because the only ill effect is to allow the
981 * sockbuf to exceed its size limit, and the size limits are not
982 * strictly guaranteed anyway.
983 */
984 UNP_PCB_LOCK(unp);
985 unp2 = unp->unp_conn;
986 if (unp2 == NULL) {
987 UNP_PCB_UNLOCK(unp);
988 return (0);
989 }
990 so2 = unp2->unp_socket;
991 SOCKBUF_LOCK(&so2->so_snd);
992 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
993 so2->so_snd.sb_flags &= ~SB_STOP;
994 sowwakeup_locked(so2);
995 UNP_PCB_UNLOCK(unp);
996 return (0);
997}
998
999static int
1000uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
1001 struct mbuf *control, struct thread *td)
1002{
1003 struct unpcb *unp, *unp2;
1004 struct socket *so2;
1005 u_int mbcnt, sbcc;
1006 int error;
1007
1008 unp = sotounpcb(so);
1009 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
1010 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_DGRAM ||
1011 so->so_type == SOCK_SEQPACKET,
1012 ("%s: socktype %d", __func__, so->so_type));
1013
1014 error = 0;
1015 if (flags & PRUS_OOB) {
1016 error = EOPNOTSUPP;
1017 goto release;
1018 }
1019 if (control != NULL && (error = unp_internalize(&control, td)))
1020 goto release;
1021
1022 unp2 = NULL;
1023 switch (so->so_type) {
1024 case SOCK_DGRAM:
1025 {
1026 const struct sockaddr *from;
1027
1028 if (nam != NULL) {
1029 error = unp_connect(so, nam, td);
1030 if (error != 0)
1031 break;
1032 }
1033 UNP_PCB_LOCK(unp);
1034
1035 /*
1036 * Because connect() and send() are non-atomic in a sendto()
1037 * with a target address, it's possible that the socket will
1038 * have disconnected before the send() can run. In that case
1039 * return the slightly counter-intuitive but otherwise
1040 * correct error that the socket is not connected.
1041 */
1042 unp2 = unp_pcb_lock_peer(unp);
1043 if (unp2 == NULL) {
1044 UNP_PCB_UNLOCK(unp);
1045 error = ENOTCONN;
1046 break;
1047 }
1048
1049 if (unp2->unp_flags & UNP_WANTCRED_MASK)
1050 control = unp_addsockcred(td, control,
1051 unp2->unp_flags);
1052 if (unp->unp_addr != NULL)
1053 from = (struct sockaddr *)unp->unp_addr;
1054 else
1055 from = &sun_noname;
1056 so2 = unp2->unp_socket;
1057 SOCKBUF_LOCK(&so2->so_rcv);
1058 if (sbappendaddr_locked(&so2->so_rcv, from, m,
1059 control)) {
1060 sorwakeup_locked(so2);
1061 m = NULL;
1062 control = NULL;
1063 } else {
1064 soroverflow_locked(so2);
1065 error = (so->so_state & SS_NBIO) ? EAGAIN : ENOBUFS;
1066 }
1067 if (nam != NULL)
1068 unp_disconnect(unp, unp2);
1069 else
1070 unp_pcb_unlock_pair(unp, unp2);
1071 break;
1072 }
1073
1074 case SOCK_SEQPACKET:
1075 case SOCK_STREAM:
1076 if ((so->so_state & SS_ISCONNECTED) == 0) {
1077 if (nam != NULL) {
1078 error = unp_connect(so, nam, td);
1079 if (error != 0)
1080 break;
1081 } else {
1082 error = ENOTCONN;
1083 break;
1084 }
1085 }
1086
1087 UNP_PCB_LOCK(unp);
1088 if ((unp2 = unp_pcb_lock_peer(unp)) == NULL) {
1089 UNP_PCB_UNLOCK(unp);
1090 error = ENOTCONN;
1091 break;
1092 } else if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
1093 unp_pcb_unlock_pair(unp, unp2);
1094 error = EPIPE;
1095 break;
1096 }
1097 UNP_PCB_UNLOCK(unp);
1098 if ((so2 = unp2->unp_socket) == NULL) {
1099 UNP_PCB_UNLOCK(unp2);
1100 error = ENOTCONN;
1101 break;
1102 }
1103 SOCKBUF_LOCK(&so2->so_rcv);
1104 if (unp2->unp_flags & UNP_WANTCRED_MASK) {
1105 /*
1106 * Credentials are passed only once on SOCK_STREAM and
1107 * SOCK_SEQPACKET (LOCAL_CREDS => WANTCRED_ONESHOT), or
1108 * forever (LOCAL_CREDS_PERSISTENT => WANTCRED_ALWAYS).
1109 */
1110 control = unp_addsockcred(td, control, unp2->unp_flags);
1111 unp2->unp_flags &= ~UNP_WANTCRED_ONESHOT;
1112 }
1113
1114 /*
1115 * Send to paired receive port and wake up readers. Don't
1116 * check for space available in the receive buffer if we're
1117 * attaching ancillary data; Unix domain sockets only check
1118 * for space in the sending sockbuf, and that check is
1119 * performed one level up the stack. At that level we cannot
1120 * precisely account for the amount of buffer space used
1121 * (e.g., because control messages are not yet internalized).
1122 */
1123 switch (so->so_type) {
1124 case SOCK_STREAM:
1125 if (control != NULL) {
1126 sbappendcontrol_locked(&so2->so_rcv, m,
1127 control, flags);
1128 control = NULL;
1129 } else
1130 sbappend_locked(&so2->so_rcv, m, flags);
1131 break;
1132
1133 case SOCK_SEQPACKET:
1134 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
1135 &sun_noname, m, control))
1136 control = NULL;
1137 break;
1138 }
1139
1140 mbcnt = so2->so_rcv.sb_mbcnt;
1141 sbcc = sbavail(&so2->so_rcv);
1142 if (sbcc)
1143 sorwakeup_locked(so2);
1144 else
1145 SOCKBUF_UNLOCK(&so2->so_rcv);
1146
1147 /*
1148 * The PCB lock on unp2 protects the SB_STOP flag. Without it,
1149 * it would be possible for uipc_rcvd to be called at this
1150 * point, drain the receiving sockbuf, clear SB_STOP, and then
1151 * we would set SB_STOP below. That could lead to an empty
1152 * sockbuf having SB_STOP set
1153 */
1154 SOCKBUF_LOCK(&so->so_snd);
1155 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1156 so->so_snd.sb_flags |= SB_STOP;
1157 SOCKBUF_UNLOCK(&so->so_snd);
1158 UNP_PCB_UNLOCK(unp2);
1159 m = NULL;
1160 break;
1161 }
1162
1163 /*
1164 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1165 */
1166 if (flags & PRUS_EOF) {
1167 UNP_PCB_LOCK(unp);
1168 socantsendmore(so);
1169 unp_shutdown(unp);
1170 UNP_PCB_UNLOCK(unp);
1171 }
1172 if (control != NULL && error != 0)
1173 unp_dispose_mbuf(control);
1174
1175release:
1176 if (control != NULL)
1177 m_freem(control);
1178 /*
1179 * In case of PRUS_NOTREADY, uipc_ready() is responsible
1180 * for freeing memory.
1181 */
1182 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1183 m_freem(m);
1184 return (error);
1185}
1186
1187static bool
1188uipc_ready_scan(struct socket *so, struct mbuf *m, int count, int *errorp)
1189{
1190 struct mbuf *mb, *n;
1191 struct sockbuf *sb;
1192
1193 SOCK_LOCK(so);
1194 if (SOLISTENING(so)) {
1195 SOCK_UNLOCK(so);
1196 return (false);
1197 }
1198 mb = NULL;
1199 sb = &so->so_rcv;
1200 SOCKBUF_LOCK(sb);
1201 if (sb->sb_fnrdy != NULL) {
1202 for (mb = sb->sb_mb, n = mb->m_nextpkt; mb != NULL;) {
1203 if (mb == m) {
1204 *errorp = sbready(sb, m, count);
1205 break;
1206 }
1207 mb = mb->m_next;
1208 if (mb == NULL) {
1209 mb = n;
1210 if (mb != NULL)
1211 n = mb->m_nextpkt;
1212 }
1213 }
1214 }
1215 SOCKBUF_UNLOCK(sb);
1216 SOCK_UNLOCK(so);
1217 return (mb != NULL);
1218}
1219
1220static int
1221uipc_ready(struct socket *so, struct mbuf *m, int count)
1222{
1223 struct unpcb *unp, *unp2;
1224 struct socket *so2;
1225 int error, i;
1226
1227 unp = sotounpcb(so);
1228
1229 KASSERT(so->so_type == SOCK_STREAM,
1230 ("%s: unexpected socket type for %p", __func__, so));
1231
1232 UNP_PCB_LOCK(unp);
1233 if ((unp2 = unp_pcb_lock_peer(unp)) != NULL) {
1234 UNP_PCB_UNLOCK(unp);
1235 so2 = unp2->unp_socket;
1236 SOCKBUF_LOCK(&so2->so_rcv);
1237 if ((error = sbready(&so2->so_rcv, m, count)) == 0)
1238 sorwakeup_locked(so2);
1239 else
1240 SOCKBUF_UNLOCK(&so2->so_rcv);
1241 UNP_PCB_UNLOCK(unp2);
1242 return (error);
1243 }
1244 UNP_PCB_UNLOCK(unp);
1245
1246 /*
1247 * The receiving socket has been disconnected, but may still be valid.
1248 * In this case, the now-ready mbufs are still present in its socket
1249 * buffer, so perform an exhaustive search before giving up and freeing
1250 * the mbufs.
1251 */
1252 UNP_LINK_RLOCK();
1253 LIST_FOREACH(unp, &unp_shead, unp_link) {
1254 if (uipc_ready_scan(unp->unp_socket, m, count, &error))
1255 break;
1256 }
1257 UNP_LINK_RUNLOCK();
1258
1259 if (unp == NULL) {
1260 for (i = 0; i < count; i++)
1261 m = m_free(m);
1262 error = ECONNRESET;
1263 }
1264 return (error);
1265}
1266
1267static int
1268uipc_sense(struct socket *so, struct stat *sb)
1269{
1270 struct unpcb *unp;
1271
1272 unp = sotounpcb(so);
1273 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1274
1275 sb->st_blksize = so->so_snd.sb_hiwat;
1276 sb->st_dev = NODEV;
1277 sb->st_ino = unp->unp_ino;
1278 return (0);
1279}
1280
1281static int
1282uipc_shutdown(struct socket *so)
1283{
1284 struct unpcb *unp;
1285
1286 unp = sotounpcb(so);
1287 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1288
1289 UNP_PCB_LOCK(unp);
1290 socantsendmore(so);
1291 unp_shutdown(unp);
1292 UNP_PCB_UNLOCK(unp);
1293 return (0);
1294}
1295
1296static int
1297uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1298{
1299 struct unpcb *unp;
1300 const struct sockaddr *sa;
1301
1302 unp = sotounpcb(so);
1303 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1304
1305 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1306 UNP_PCB_LOCK(unp);
1307 if (unp->unp_addr != NULL)
1308 sa = (struct sockaddr *) unp->unp_addr;
1309 else
1310 sa = &sun_noname;
1311 bcopy(sa, *nam, sa->sa_len);
1312 UNP_PCB_UNLOCK(unp);
1313 return (0);
1314}
1315
1316static struct pr_usrreqs uipc_usrreqs_dgram = {
1317 .pru_abort = uipc_abort,
1318 .pru_accept = uipc_accept,
1319 .pru_attach = uipc_attach,
1320 .pru_bind = uipc_bind,
1321 .pru_bindat = uipc_bindat,
1322 .pru_connect = uipc_connect,
1323 .pru_connectat = uipc_connectat,
1324 .pru_connect2 = uipc_connect2,
1325 .pru_detach = uipc_detach,
1326 .pru_disconnect = uipc_disconnect,
1327 .pru_listen = uipc_listen,
1328 .pru_peeraddr = uipc_peeraddr,
1329 .pru_rcvd = uipc_rcvd,
1330 .pru_send = uipc_send,
1331 .pru_sense = uipc_sense,
1332 .pru_shutdown = uipc_shutdown,
1333 .pru_sockaddr = uipc_sockaddr,
1334 .pru_soreceive = soreceive_dgram,
1335 .pru_close = uipc_close,
1336};
1337
1338static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1339 .pru_abort = uipc_abort,
1340 .pru_accept = uipc_accept,
1341 .pru_attach = uipc_attach,
1342 .pru_bind = uipc_bind,
1343 .pru_bindat = uipc_bindat,
1344 .pru_connect = uipc_connect,
1345 .pru_connectat = uipc_connectat,
1346 .pru_connect2 = uipc_connect2,
1347 .pru_detach = uipc_detach,
1348 .pru_disconnect = uipc_disconnect,
1349 .pru_listen = uipc_listen,
1350 .pru_peeraddr = uipc_peeraddr,
1351 .pru_rcvd = uipc_rcvd,
1352 .pru_send = uipc_send,
1353 .pru_sense = uipc_sense,
1354 .pru_shutdown = uipc_shutdown,
1355 .pru_sockaddr = uipc_sockaddr,
1356 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1357 .pru_close = uipc_close,
1358};
1359
1360static struct pr_usrreqs uipc_usrreqs_stream = {
1361 .pru_abort = uipc_abort,
1362 .pru_accept = uipc_accept,
1363 .pru_attach = uipc_attach,
1364 .pru_bind = uipc_bind,
1365 .pru_bindat = uipc_bindat,
1366 .pru_connect = uipc_connect,
1367 .pru_connectat = uipc_connectat,
1368 .pru_connect2 = uipc_connect2,
1369 .pru_detach = uipc_detach,
1370 .pru_disconnect = uipc_disconnect,
1371 .pru_listen = uipc_listen,
1372 .pru_peeraddr = uipc_peeraddr,
1373 .pru_rcvd = uipc_rcvd,
1374 .pru_send = uipc_send,
1375 .pru_ready = uipc_ready,
1376 .pru_sense = uipc_sense,
1377 .pru_shutdown = uipc_shutdown,
1378 .pru_sockaddr = uipc_sockaddr,
1379 .pru_soreceive = soreceive_generic,
1380 .pru_close = uipc_close,
1381};
1382
1383static int
1384uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1385{
1386 struct unpcb *unp;
1387 struct xucred xu;
1388 int error, optval;
1389
1390 if (sopt->sopt_level != SOL_LOCAL)
1391 return (EINVAL);
1392
1393 unp = sotounpcb(so);
1394 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1395 error = 0;
1396 switch (sopt->sopt_dir) {
1397 case SOPT_GET:
1398 switch (sopt->sopt_name) {
1399 case LOCAL_PEERCRED:
1400 UNP_PCB_LOCK(unp);
1401 if (unp->unp_flags & UNP_HAVEPC)
1402 xu = unp->unp_peercred;
1403 else {
1404 if (so->so_type == SOCK_STREAM)
1405 error = ENOTCONN;
1406 else
1407 error = EINVAL;
1408 }
1409 UNP_PCB_UNLOCK(unp);
1410 if (error == 0)
1411 error = sooptcopyout(sopt, &xu, sizeof(xu));
1412 break;
1413
1414 case LOCAL_CREDS:
1415 /* Unlocked read. */
1416 optval = unp->unp_flags & UNP_WANTCRED_ONESHOT ? 1 : 0;
1417 error = sooptcopyout(sopt, &optval, sizeof(optval));
1418 break;
1419
1420 case LOCAL_CREDS_PERSISTENT:
1421 /* Unlocked read. */
1422 optval = unp->unp_flags & UNP_WANTCRED_ALWAYS ? 1 : 0;
1423 error = sooptcopyout(sopt, &optval, sizeof(optval));
1424 break;
1425
1426 case LOCAL_CONNWAIT:
1427 /* Unlocked read. */
1428 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1429 error = sooptcopyout(sopt, &optval, sizeof(optval));
1430 break;
1431
1432 default:
1433 error = EOPNOTSUPP;
1434 break;
1435 }
1436 break;
1437
1438 case SOPT_SET:
1439 switch (sopt->sopt_name) {
1440 case LOCAL_CREDS:
1441 case LOCAL_CREDS_PERSISTENT:
1442 case LOCAL_CONNWAIT:
1443 error = sooptcopyin(sopt, &optval, sizeof(optval),
1444 sizeof(optval));
1445 if (error)
1446 break;
1447
1448#define OPTSET(bit, exclusive) do { \
1449 UNP_PCB_LOCK(unp); \
1450 if (optval) { \
1451 if ((unp->unp_flags & (exclusive)) != 0) { \
1452 UNP_PCB_UNLOCK(unp); \
1453 error = EINVAL; \
1454 break; \
1455 } \
1456 unp->unp_flags |= (bit); \
1457 } else \
1458 unp->unp_flags &= ~(bit); \
1459 UNP_PCB_UNLOCK(unp); \
1460} while (0)
1461
1462 switch (sopt->sopt_name) {
1463 case LOCAL_CREDS:
1464 OPTSET(UNP_WANTCRED_ONESHOT, UNP_WANTCRED_ALWAYS);
1465 break;
1466
1467 case LOCAL_CREDS_PERSISTENT:
1468 OPTSET(UNP_WANTCRED_ALWAYS, UNP_WANTCRED_ONESHOT);
1469 break;
1470
1471 case LOCAL_CONNWAIT:
1472 OPTSET(UNP_CONNWAIT, 0);
1473 break;
1474
1475 default:
1476 break;
1477 }
1478 break;
1479#undef OPTSET
1480 default:
1481 error = ENOPROTOOPT;
1482 break;
1483 }
1484 break;
1485
1486 default:
1487 error = EOPNOTSUPP;
1488 break;
1489 }
1490 return (error);
1491}
1492
1493static int
1494unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1495{
1496
1497 return (unp_connectat(AT_FDCWD, so, nam, td));
1498}
1499
1500static int
1501unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1502 struct thread *td)
1503{
1504 struct mtx *vplock;
1505 struct sockaddr_un *soun;
1506 struct vnode *vp;
1507 struct socket *so2;
1508 struct unpcb *unp, *unp2, *unp3;
1509 struct nameidata nd;
1510 char buf[SOCK_MAXADDRLEN];
1511 struct sockaddr *sa;
1512 cap_rights_t rights;
1513 int error, len;
1514 bool connreq;
1515
1516 if (nam->sa_family != AF_UNIX)
1517 return (EAFNOSUPPORT);
1518 if (nam->sa_len > sizeof(struct sockaddr_un))
1519 return (EINVAL);
1520 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1521 if (len <= 0)
1522 return (EINVAL);
1523 soun = (struct sockaddr_un *)nam;
1524 bcopy(soun->sun_path, buf, len);
1525 buf[len] = 0;
1526
1527 error = 0;
1528 unp = sotounpcb(so);
1529 UNP_PCB_LOCK(unp);
1530 for (;;) {
1531 /*
1532 * Wait for connection state to stabilize. If a connection
1533 * already exists, give up. For datagram sockets, which permit
1534 * multiple consecutive connect(2) calls, upper layers are
1535 * responsible for disconnecting in advance of a subsequent
1536 * connect(2), but this is not synchronized with PCB connection
1537 * state.
1538 *
1539 * Also make sure that no threads are currently attempting to
1540 * lock the peer socket, to ensure that unp_conn cannot
1541 * transition between two valid sockets while locks are dropped.
1542 */
1543 if (SOLISTENING(so))
1544 error = EOPNOTSUPP;
1545 else if (unp->unp_conn != NULL)
1546 error = EISCONN;
1547 else if ((unp->unp_flags & UNP_CONNECTING) != 0) {
1548 error = EALREADY;
1549 }
1550 if (error != 0) {
1551 UNP_PCB_UNLOCK(unp);
1552 return (error);
1553 }
1554 if (unp->unp_pairbusy > 0) {
1555 unp->unp_flags |= UNP_WAITING;
1556 mtx_sleep(unp, UNP_PCB_LOCKPTR(unp), 0, "unpeer", 0);
1557 continue;
1558 }
1559 break;
1560 }
1561 unp->unp_flags |= UNP_CONNECTING;
1562 UNP_PCB_UNLOCK(unp);
1563
1564 connreq = (so->so_proto->pr_flags & PR_CONNREQUIRED) != 0;
1565 if (connreq)
1566 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1567 else
1568 sa = NULL;
1569 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1570 UIO_SYSSPACE, buf, fd, cap_rights_init_one(&rights, CAP_CONNECTAT));
1571 error = namei(&nd);
1572 if (error)
1573 vp = NULL;
1574 else
1575 vp = nd.ni_vp;
1576 ASSERT_VOP_LOCKED(vp, "unp_connect");
1577 NDFREE_NOTHING(&nd);
1578 if (error)
1579 goto bad;
1580
1581 if (vp->v_type != VSOCK) {
1582 error = ENOTSOCK;
1583 goto bad;
1584 }
1585#ifdef MAC
1586 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1587 if (error)
1588 goto bad;
1589#endif
1590 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1591 if (error)
1592 goto bad;
1593
1594 unp = sotounpcb(so);
1595 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1596
1597 vplock = mtx_pool_find(mtxpool_sleep, vp);
1598 mtx_lock(vplock);
1599 VOP_UNP_CONNECT(vp, &unp2);
1600 if (unp2 == NULL) {
1601 error = ECONNREFUSED;
1602 goto bad2;
1603 }
1604 so2 = unp2->unp_socket;
1605 if (so->so_type != so2->so_type) {
1606 error = EPROTOTYPE;
1607 goto bad2;
1608 }
1609 if (connreq) {
1610 if (SOLISTENING(so2)) {
1611 CURVNET_SET(so2->so_vnet);
1612 so2 = sonewconn(so2, 0);
1613 CURVNET_RESTORE();
1614 } else
1615 so2 = NULL;
1616 if (so2 == NULL) {
1617 error = ECONNREFUSED;
1618 goto bad2;
1619 }
1620 unp3 = sotounpcb(so2);
1621 unp_pcb_lock_pair(unp2, unp3);
1622 if (unp2->unp_addr != NULL) {
1623 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1624 unp3->unp_addr = (struct sockaddr_un *) sa;
1625 sa = NULL;
1626 }
1627
1628 unp_copy_peercred(td, unp3, unp, unp2);
1629
1630 UNP_PCB_UNLOCK(unp2);
1631 unp2 = unp3;
1632
1633 /*
1634 * It is safe to block on the PCB lock here since unp2 is
1635 * nascent and cannot be connected to any other sockets.
1636 */
1637 UNP_PCB_LOCK(unp);
1638#ifdef MAC
1639 mac_socketpeer_set_from_socket(so, so2);
1640 mac_socketpeer_set_from_socket(so2, so);
1641#endif
1642 } else {
1643 unp_pcb_lock_pair(unp, unp2);
1644 }
1645 KASSERT(unp2 != NULL && so2 != NULL && unp2->unp_socket == so2 &&
1646 sotounpcb(so2) == unp2,
1647 ("%s: unp2 %p so2 %p", __func__, unp2, so2));
1648 error = unp_connect2(so, so2, PRU_CONNECT);
1649 unp_pcb_unlock_pair(unp, unp2);
1650bad2:
1651 mtx_unlock(vplock);
1652bad:
1653 if (vp != NULL) {
1654 vput(vp);
1655 }
1656 free(sa, M_SONAME);
1657 UNP_PCB_LOCK(unp);
1658 KASSERT((unp->unp_flags & UNP_CONNECTING) != 0,
1659 ("%s: unp %p has UNP_CONNECTING clear", __func__, unp));
1660 unp->unp_flags &= ~UNP_CONNECTING;
1661 UNP_PCB_UNLOCK(unp);
1662 return (error);
1663}
1664
1665/*
1666 * Set socket peer credentials at connection time.
1667 *
1668 * The client's PCB credentials are copied from its process structure. The
1669 * server's PCB credentials are copied from the socket on which it called
1670 * listen(2). uipc_listen cached that process's credentials at the time.
1671 */
1672void
1673unp_copy_peercred(struct thread *td, struct unpcb *client_unp,
1674 struct unpcb *server_unp, struct unpcb *listen_unp)
1675{
1676 cru2xt(td, &client_unp->unp_peercred);
1677 client_unp->unp_flags |= UNP_HAVEPC;
1678
1679 memcpy(&server_unp->unp_peercred, &listen_unp->unp_peercred,
1680 sizeof(server_unp->unp_peercred));
1681 server_unp->unp_flags |= UNP_HAVEPC;
1682 client_unp->unp_flags |= (listen_unp->unp_flags & UNP_WANTCRED_MASK);
1683}
1684
1685static int
1686unp_connect2(struct socket *so, struct socket *so2, int req)
1687{
1688 struct unpcb *unp;
1689 struct unpcb *unp2;
1690
1691 unp = sotounpcb(so);
1692 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1693 unp2 = sotounpcb(so2);
1694 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1695
1696 UNP_PCB_LOCK_ASSERT(unp);
1697 UNP_PCB_LOCK_ASSERT(unp2);
1698 KASSERT(unp->unp_conn == NULL,
1699 ("%s: socket %p is already connected", __func__, unp));
1700
1701 if (so2->so_type != so->so_type)
1702 return (EPROTOTYPE);
1703 unp->unp_conn = unp2;
1704 unp_pcb_hold(unp2);
1705 unp_pcb_hold(unp);
1706 switch (so->so_type) {
1707 case SOCK_DGRAM:
1708 UNP_REF_LIST_LOCK();
1709 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1710 UNP_REF_LIST_UNLOCK();
1711 soisconnected(so);
1712 break;
1713
1714 case SOCK_STREAM:
1715 case SOCK_SEQPACKET:
1716 KASSERT(unp2->unp_conn == NULL,
1717 ("%s: socket %p is already connected", __func__, unp2));
1718 unp2->unp_conn = unp;
1719 if (req == PRU_CONNECT &&
1720 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1721 soisconnecting(so);
1722 else
1723 soisconnected(so);
1724 soisconnected(so2);
1725 break;
1726
1727 default:
1728 panic("unp_connect2");
1729 }
1730 return (0);
1731}
1732
1733static void
1734unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1735{
1736 struct socket *so, *so2;
1737#ifdef INVARIANTS
1738 struct unpcb *unptmp;
1739#endif
1740
1741 UNP_PCB_LOCK_ASSERT(unp);
1742 UNP_PCB_LOCK_ASSERT(unp2);
1743 KASSERT(unp->unp_conn == unp2,
1744 ("%s: unpcb %p is not connected to %p", __func__, unp, unp2));
1745
1746 unp->unp_conn = NULL;
1747 so = unp->unp_socket;
1748 so2 = unp2->unp_socket;
1749 switch (unp->unp_socket->so_type) {
1750 case SOCK_DGRAM:
1751 UNP_REF_LIST_LOCK();
1752#ifdef INVARIANTS
1753 LIST_FOREACH(unptmp, &unp2->unp_refs, unp_reflink) {
1754 if (unptmp == unp)
1755 break;
1756 }
1757 KASSERT(unptmp != NULL,
1758 ("%s: %p not found in reflist of %p", __func__, unp, unp2));
1759#endif
1760 LIST_REMOVE(unp, unp_reflink);
1761 UNP_REF_LIST_UNLOCK();
1762 if (so) {
1763 SOCK_LOCK(so);
1764 so->so_state &= ~SS_ISCONNECTED;
1765 SOCK_UNLOCK(so);
1766 }
1767 break;
1768
1769 case SOCK_STREAM:
1770 case SOCK_SEQPACKET:
1771 if (so)
1772 soisdisconnected(so);
1773 MPASS(unp2->unp_conn == unp);
1774 unp2->unp_conn = NULL;
1775 if (so2)
1776 soisdisconnected(so2);
1777 break;
1778 }
1779
1780 if (unp == unp2) {
1781 unp_pcb_rele_notlast(unp);
1782 if (!unp_pcb_rele(unp))
1783 UNP_PCB_UNLOCK(unp);
1784 } else {
1785 if (!unp_pcb_rele(unp))
1786 UNP_PCB_UNLOCK(unp);
1787 if (!unp_pcb_rele(unp2))
1788 UNP_PCB_UNLOCK(unp2);
1789 }
1790}
1791
1792/*
1793 * unp_pcblist() walks the global list of struct unpcb's to generate a
1794 * pointer list, bumping the refcount on each unpcb. It then copies them out
1795 * sequentially, validating the generation number on each to see if it has
1796 * been detached. All of this is necessary because copyout() may sleep on
1797 * disk I/O.
1798 */
1799static int
1800unp_pcblist(SYSCTL_HANDLER_ARGS)
1801{
1802 struct unpcb *unp, **unp_list;
1803 unp_gen_t gencnt;
1804 struct xunpgen *xug;
1805 struct unp_head *head;
1806 struct xunpcb *xu;
1807 u_int i;
1808 int error, n;
1809
1810 switch ((intptr_t)arg1) {
1811 case SOCK_STREAM:
1812 head = &unp_shead;
1813 break;
1814
1815 case SOCK_DGRAM:
1816 head = &unp_dhead;
1817 break;
1818
1819 case SOCK_SEQPACKET:
1820 head = &unp_sphead;
1821 break;
1822
1823 default:
1824 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1825 }
1826
1827 /*
1828 * The process of preparing the PCB list is too time-consuming and
1829 * resource-intensive to repeat twice on every request.
1830 */
1831 if (req->oldptr == NULL) {
1832 n = unp_count;
1833 req->oldidx = 2 * (sizeof *xug)
1834 + (n + n/8) * sizeof(struct xunpcb);
1835 return (0);
1836 }
1837
1838 if (req->newptr != NULL)
1839 return (EPERM);
1840
1841 /*
1842 * OK, now we're committed to doing something.
1843 */
1844 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK | M_ZERO);
1845 UNP_LINK_RLOCK();
1846 gencnt = unp_gencnt;
1847 n = unp_count;
1848 UNP_LINK_RUNLOCK();
1849
1850 xug->xug_len = sizeof *xug;
1851 xug->xug_count = n;
1852 xug->xug_gen = gencnt;
1853 xug->xug_sogen = so_gencnt;
1854 error = SYSCTL_OUT(req, xug, sizeof *xug);
1855 if (error) {
1856 free(xug, M_TEMP);
1857 return (error);
1858 }
1859
1860 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1861
1862 UNP_LINK_RLOCK();
1863 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1864 unp = LIST_NEXT(unp, unp_link)) {
1865 UNP_PCB_LOCK(unp);
1866 if (unp->unp_gencnt <= gencnt) {
1867 if (cr_cansee(req->td->td_ucred,
1868 unp->unp_socket->so_cred)) {
1869 UNP_PCB_UNLOCK(unp);
1870 continue;
1871 }
1872 unp_list[i++] = unp;
1873 unp_pcb_hold(unp);
1874 }
1875 UNP_PCB_UNLOCK(unp);
1876 }
1877 UNP_LINK_RUNLOCK();
1878 n = i; /* In case we lost some during malloc. */
1879
1880 error = 0;
1881 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1882 for (i = 0; i < n; i++) {
1883 unp = unp_list[i];
1884 UNP_PCB_LOCK(unp);
1885 if (unp_pcb_rele(unp))
1886 continue;
1887
1888 if (unp->unp_gencnt <= gencnt) {
1889 xu->xu_len = sizeof *xu;
1890 xu->xu_unpp = (uintptr_t)unp;
1891 /*
1892 * XXX - need more locking here to protect against
1893 * connect/disconnect races for SMP.
1894 */
1895 if (unp->unp_addr != NULL)
1896 bcopy(unp->unp_addr, &xu->xu_addr,
1897 unp->unp_addr->sun_len);
1898 else
1899 bzero(&xu->xu_addr, sizeof(xu->xu_addr));
1900 if (unp->unp_conn != NULL &&
1901 unp->unp_conn->unp_addr != NULL)
1902 bcopy(unp->unp_conn->unp_addr,
1903 &xu->xu_caddr,
1904 unp->unp_conn->unp_addr->sun_len);
1905 else
1906 bzero(&xu->xu_caddr, sizeof(xu->xu_caddr));
1907 xu->unp_vnode = (uintptr_t)unp->unp_vnode;
1908 xu->unp_conn = (uintptr_t)unp->unp_conn;
1909 xu->xu_firstref = (uintptr_t)LIST_FIRST(&unp->unp_refs);
1910 xu->xu_nextref = (uintptr_t)LIST_NEXT(unp, unp_reflink);
1911 xu->unp_gencnt = unp->unp_gencnt;
1912 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1913 UNP_PCB_UNLOCK(unp);
1914 error = SYSCTL_OUT(req, xu, sizeof *xu);
1915 } else {
1916 UNP_PCB_UNLOCK(unp);
1917 }
1918 }
1919 free(xu, M_TEMP);
1920 if (!error) {
1921 /*
1922 * Give the user an updated idea of our state. If the
1923 * generation differs from what we told her before, she knows
1924 * that something happened while we were processing this
1925 * request, and it might be necessary to retry.
1926 */
1927 xug->xug_gen = unp_gencnt;
1928 xug->xug_sogen = so_gencnt;
1929 xug->xug_count = unp_count;
1930 error = SYSCTL_OUT(req, xug, sizeof *xug);
1931 }
1932 free(unp_list, M_TEMP);
1933 free(xug, M_TEMP);
1934 return (error);
1935}
1936
1937SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist,
1938 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
1939 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1940 "List of active local datagram sockets");
1941SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist,
1942 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
1943 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1944 "List of active local stream sockets");
1945SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1946 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
1947 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1948 "List of active local seqpacket sockets");
1949
1950static void
1951unp_shutdown(struct unpcb *unp)
1952{
1953 struct unpcb *unp2;
1954 struct socket *so;
1955
1956 UNP_PCB_LOCK_ASSERT(unp);
1957
1958 unp2 = unp->unp_conn;
1959 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1960 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1961 so = unp2->unp_socket;
1962 if (so != NULL)
1963 socantrcvmore(so);
1964 }
1965}
1966
1967static void
1968unp_drop(struct unpcb *unp)
1969{
1970 struct socket *so;
1971 struct unpcb *unp2;
1972
1973 /*
1974 * Regardless of whether the socket's peer dropped the connection
1975 * with this socket by aborting or disconnecting, POSIX requires
1976 * that ECONNRESET is returned.
1977 */
1978
1979 UNP_PCB_LOCK(unp);
1980 so = unp->unp_socket;
1981 if (so)
1982 so->so_error = ECONNRESET;
1983 if ((unp2 = unp_pcb_lock_peer(unp)) != NULL) {
1984 /* Last reference dropped in unp_disconnect(). */
1985 unp_pcb_rele_notlast(unp);
1986 unp_disconnect(unp, unp2);
1987 } else if (!unp_pcb_rele(unp)) {
1988 UNP_PCB_UNLOCK(unp);
1989 }
1990}
1991
1992static void
1993unp_freerights(struct filedescent **fdep, int fdcount)
1994{
1995 struct file *fp;
1996 int i;
1997
1998 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1999
2000 for (i = 0; i < fdcount; i++) {
2001 fp = fdep[i]->fde_file;
2002 filecaps_free(&fdep[i]->fde_caps);
2003 unp_discard(fp);
2004 }
2005 free(fdep[0], M_FILECAPS);
2006}
2007
2008static int
2009unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
2010{
2011 struct thread *td = curthread; /* XXX */
2012 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
2013 int i;
2014 int *fdp;
2015 struct filedesc *fdesc = td->td_proc->p_fd;
2016 struct filedescent **fdep;
2017 void *data;
2018 socklen_t clen = control->m_len, datalen;
2019 int error, newfds;
2020 u_int newlen;
2021
2022 UNP_LINK_UNLOCK_ASSERT();
2023
2024 error = 0;
2025 if (controlp != NULL) /* controlp == NULL => free control messages */
2026 *controlp = NULL;
2027 while (cm != NULL) {
2028 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
2029 error = EINVAL;
2030 break;
2031 }
2032 data = CMSG_DATA(cm);
2033 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
2034 if (cm->cmsg_level == SOL_SOCKET
2035 && cm->cmsg_type == SCM_RIGHTS) {
2036 newfds = datalen / sizeof(*fdep);
2037 if (newfds == 0)
2038 goto next;
2039 fdep = data;
2040
2041 /* If we're not outputting the descriptors free them. */
2042 if (error || controlp == NULL) {
2043 unp_freerights(fdep, newfds);
2044 goto next;
2045 }
2046 FILEDESC_XLOCK(fdesc);
2047
2048 /*
2049 * Now change each pointer to an fd in the global
2050 * table to an integer that is the index to the local
2051 * fd table entry that we set up to point to the
2052 * global one we are transferring.
2053 */
2054 newlen = newfds * sizeof(int);
2055 *controlp = sbcreatecontrol(NULL, newlen,
2056 SCM_RIGHTS, SOL_SOCKET);
2057 if (*controlp == NULL) {
2058 FILEDESC_XUNLOCK(fdesc);
2059 error = E2BIG;
2060 unp_freerights(fdep, newfds);
2061 goto next;
2062 }
2063
2064 fdp = (int *)
2065 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2066 if (fdallocn(td, 0, fdp, newfds) != 0) {
2067 FILEDESC_XUNLOCK(fdesc);
2068 error = EMSGSIZE;
2069 unp_freerights(fdep, newfds);
2070 m_freem(*controlp);
2071 *controlp = NULL;
2072 goto next;
2073 }
2074 for (i = 0; i < newfds; i++, fdp++) {
2075 _finstall(fdesc, fdep[i]->fde_file, *fdp,
2076 (flags & MSG_CMSG_CLOEXEC) != 0 ? O_CLOEXEC : 0,
2077 &fdep[i]->fde_caps);
2078 unp_externalize_fp(fdep[i]->fde_file);
2079 }
2080
2081 /*
2082 * The new type indicates that the mbuf data refers to
2083 * kernel resources that may need to be released before
2084 * the mbuf is freed.
2085 */
2086 m_chtype(*controlp, MT_EXTCONTROL);
2087 FILEDESC_XUNLOCK(fdesc);
2088 free(fdep[0], M_FILECAPS);
2089 } else {
2090 /* We can just copy anything else across. */
2091 if (error || controlp == NULL)
2092 goto next;
2093 *controlp = sbcreatecontrol(NULL, datalen,
2094 cm->cmsg_type, cm->cmsg_level);
2095 if (*controlp == NULL) {
2096 error = ENOBUFS;
2097 goto next;
2098 }
2099 bcopy(data,
2100 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
2101 datalen);
2102 }
2103 controlp = &(*controlp)->m_next;
2104
2105next:
2106 if (CMSG_SPACE(datalen) < clen) {
2107 clen -= CMSG_SPACE(datalen);
2108 cm = (struct cmsghdr *)
2109 ((caddr_t)cm + CMSG_SPACE(datalen));
2110 } else {
2111 clen = 0;
2112 cm = NULL;
2113 }
2114 }
2115
2116 m_freem(control);
2117 return (error);
2118}
2119
2120static void
2121unp_zone_change(void *tag)
2122{
2123
2124 uma_zone_set_max(unp_zone, maxsockets);
2125}
2126
2127#ifdef INVARIANTS
2128static void
2129unp_zdtor(void *mem, int size __unused, void *arg __unused)
2130{
2131 struct unpcb *unp;
2132
2133 unp = mem;
2134
2135 KASSERT(LIST_EMPTY(&unp->unp_refs),
2136 ("%s: unpcb %p has lingering refs", __func__, unp));
2137 KASSERT(unp->unp_socket == NULL,
2138 ("%s: unpcb %p has socket backpointer", __func__, unp));
2139 KASSERT(unp->unp_vnode == NULL,
2140 ("%s: unpcb %p has vnode references", __func__, unp));
2141 KASSERT(unp->unp_conn == NULL,
2142 ("%s: unpcb %p is still connected", __func__, unp));
2143 KASSERT(unp->unp_addr == NULL,
2144 ("%s: unpcb %p has leaked addr", __func__, unp));
2145}
2146#endif
2147
2148static void
2149unp_init(void *arg __unused)
2150{
2151 uma_dtor dtor;
2152
2153#ifdef INVARIANTS
2154 dtor = unp_zdtor;
2155#else
2156 dtor = NULL;
2157#endif
2158 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, dtor,
2159 NULL, NULL, UMA_ALIGN_CACHE, 0);
2160 uma_zone_set_max(unp_zone, maxsockets);
2161 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
2162 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
2163 NULL, EVENTHANDLER_PRI_ANY);
2164 LIST_INIT(&unp_dhead);
2165 LIST_INIT(&unp_shead);
2166 LIST_INIT(&unp_sphead);
2167 SLIST_INIT(&unp_defers);
2168 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
2169 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
2170 UNP_LINK_LOCK_INIT();
2171 UNP_DEFERRED_LOCK_INIT();
2172}
2173SYSINIT(unp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND, unp_init, NULL);
2174
2175static void
2176unp_internalize_cleanup_rights(struct mbuf *control)
2177{
2178 struct cmsghdr *cp;
2179 struct mbuf *m;
2180 void *data;
2181 socklen_t datalen;
2182
2183 for (m = control; m != NULL; m = m->m_next) {
2184 cp = mtod(m, struct cmsghdr *);
2185 if (cp->cmsg_level != SOL_SOCKET ||
2186 cp->cmsg_type != SCM_RIGHTS)
2187 continue;
2188 data = CMSG_DATA(cp);
2189 datalen = (caddr_t)cp + cp->cmsg_len - (caddr_t)data;
2190 unp_freerights(data, datalen / sizeof(struct filedesc *));
2191 }
2192}
2193
2194static int
2195unp_internalize(struct mbuf **controlp, struct thread *td)
2196{
2197 struct mbuf *control, **initial_controlp;
2198 struct proc *p;
2199 struct filedesc *fdesc;
2200 struct bintime *bt;
2201 struct cmsghdr *cm;
2202 struct cmsgcred *cmcred;
2203 struct filedescent *fde, **fdep, *fdev;
2204 struct file *fp;
2205 struct timeval *tv;
2206 struct timespec *ts;
2207 void *data;
2208 socklen_t clen, datalen;
2209 int i, j, error, *fdp, oldfds;
2210 u_int newlen;
2211
2212 UNP_LINK_UNLOCK_ASSERT();
2213
2214 p = td->td_proc;
2215 fdesc = p->p_fd;
2216 error = 0;
2217 control = *controlp;
2218 clen = control->m_len;
2219 *controlp = NULL;
2220 initial_controlp = controlp;
2221 for (cm = mtod(control, struct cmsghdr *); cm != NULL;) {
2222 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
2223 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
2224 error = EINVAL;
2225 goto out;
2226 }
2227 data = CMSG_DATA(cm);
2228 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
2229
2230 switch (cm->cmsg_type) {
2231 /*
2232 * Fill in credential information.
2233 */
2234 case SCM_CREDS:
2235 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
2236 SCM_CREDS, SOL_SOCKET);
2237 if (*controlp == NULL) {
2238 error = ENOBUFS;
2239 goto out;
2240 }
2241 cmcred = (struct cmsgcred *)
2242 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2243 cmcred->cmcred_pid = p->p_pid;
2244 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
2245 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
2246 cmcred->cmcred_euid = td->td_ucred->cr_uid;
2247 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
2248 CMGROUP_MAX);
2249 for (i = 0; i < cmcred->cmcred_ngroups; i++)
2250 cmcred->cmcred_groups[i] =
2251 td->td_ucred->cr_groups[i];
2252 break;
2253
2254 case SCM_RIGHTS:
2255 oldfds = datalen / sizeof (int);
2256 if (oldfds == 0)
2257 break;
2258 /*
2259 * Check that all the FDs passed in refer to legal
2260 * files. If not, reject the entire operation.
2261 */
2262 fdp = data;
2263 FILEDESC_SLOCK(fdesc);
2264 for (i = 0; i < oldfds; i++, fdp++) {
2265 fp = fget_noref(fdesc, *fdp);
2266 if (fp == NULL) {
2267 FILEDESC_SUNLOCK(fdesc);
2268 error = EBADF;
2269 goto out;
2270 }
2271 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
2272 FILEDESC_SUNLOCK(fdesc);
2273 error = EOPNOTSUPP;
2274 goto out;
2275 }
2276 }
2277
2278 /*
2279 * Now replace the integer FDs with pointers to the
2280 * file structure and capability rights.
2281 */
2282 newlen = oldfds * sizeof(fdep[0]);
2283 *controlp = sbcreatecontrol(NULL, newlen,
2284 SCM_RIGHTS, SOL_SOCKET);
2285 if (*controlp == NULL) {
2286 FILEDESC_SUNLOCK(fdesc);
2287 error = E2BIG;
2288 goto out;
2289 }
2290 fdp = data;
2291 for (i = 0; i < oldfds; i++, fdp++) {
2292 if (!fhold(fdesc->fd_ofiles[*fdp].fde_file)) {
2293 fdp = data;
2294 for (j = 0; j < i; j++, fdp++) {
2295 fdrop(fdesc->fd_ofiles[*fdp].
2296 fde_file, td);
2297 }
2298 FILEDESC_SUNLOCK(fdesc);
2299 error = EBADF;
2300 goto out;
2301 }
2302 }
2303 fdp = data;
2304 fdep = (struct filedescent **)
2305 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2306 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
2307 M_WAITOK);
2308 for (i = 0; i < oldfds; i++, fdev++, fdp++) {
2309 fde = &fdesc->fd_ofiles[*fdp];
2310 fdep[i] = fdev;
2311 fdep[i]->fde_file = fde->fde_file;
2312 filecaps_copy(&fde->fde_caps,
2313 &fdep[i]->fde_caps, true);
2314 unp_internalize_fp(fdep[i]->fde_file);
2315 }
2316 FILEDESC_SUNLOCK(fdesc);
2317 break;
2318
2319 case SCM_TIMESTAMP:
2320 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
2321 SCM_TIMESTAMP, SOL_SOCKET);
2322 if (*controlp == NULL) {
2323 error = ENOBUFS;
2324 goto out;
2325 }
2326 tv = (struct timeval *)
2327 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2328 microtime(tv);
2329 break;
2330
2331 case SCM_BINTIME:
2332 *controlp = sbcreatecontrol(NULL, sizeof(*bt),
2333 SCM_BINTIME, SOL_SOCKET);
2334 if (*controlp == NULL) {
2335 error = ENOBUFS;
2336 goto out;
2337 }
2338 bt = (struct bintime *)
2339 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2340 bintime(bt);
2341 break;
2342
2343 case SCM_REALTIME:
2344 *controlp = sbcreatecontrol(NULL, sizeof(*ts),
2345 SCM_REALTIME, SOL_SOCKET);
2346 if (*controlp == NULL) {
2347 error = ENOBUFS;
2348 goto out;
2349 }
2350 ts = (struct timespec *)
2351 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2352 nanotime(ts);
2353 break;
2354
2355 case SCM_MONOTONIC:
2356 *controlp = sbcreatecontrol(NULL, sizeof(*ts),
2357 SCM_MONOTONIC, SOL_SOCKET);
2358 if (*controlp == NULL) {
2359 error = ENOBUFS;
2360 goto out;
2361 }
2362 ts = (struct timespec *)
2363 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2364 nanouptime(ts);
2365 break;
2366
2367 default:
2368 error = EINVAL;
2369 goto out;
2370 }
2371
2372 if (*controlp != NULL)
2373 controlp = &(*controlp)->m_next;
2374 if (CMSG_SPACE(datalen) < clen) {
2375 clen -= CMSG_SPACE(datalen);
2376 cm = (struct cmsghdr *)
2377 ((caddr_t)cm + CMSG_SPACE(datalen));
2378 } else {
2379 clen = 0;
2380 cm = NULL;
2381 }
2382 }
2383
2384out:
2385 if (error != 0 && initial_controlp != NULL)
2386 unp_internalize_cleanup_rights(*initial_controlp);
2387 m_freem(control);
2388 return (error);
2389}
2390
2391static struct mbuf *
2392unp_addsockcred(struct thread *td, struct mbuf *control, int mode)
2393{
2394 struct mbuf *m, *n, *n_prev;
2395 const struct cmsghdr *cm;
2396 int ngroups, i, cmsgtype;
2397 size_t ctrlsz;
2398
2399 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2400 if (mode & UNP_WANTCRED_ALWAYS) {
2401 ctrlsz = SOCKCRED2SIZE(ngroups);
2402 cmsgtype = SCM_CREDS2;
2403 } else {
2404 ctrlsz = SOCKCREDSIZE(ngroups);
2405 cmsgtype = SCM_CREDS;
2406 }
2407
2408 m = sbcreatecontrol(NULL, ctrlsz, cmsgtype, SOL_SOCKET);
2409 if (m == NULL)
2410 return (control);
2411
2412 if (mode & UNP_WANTCRED_ALWAYS) {
2413 struct sockcred2 *sc;
2414
2415 sc = (void *)CMSG_DATA(mtod(m, struct cmsghdr *));
2416 sc->sc_version = 0;
2417 sc->sc_pid = td->td_proc->p_pid;
2418 sc->sc_uid = td->td_ucred->cr_ruid;
2419 sc->sc_euid = td->td_ucred->cr_uid;
2420 sc->sc_gid = td->td_ucred->cr_rgid;
2421 sc->sc_egid = td->td_ucred->cr_gid;
2422 sc->sc_ngroups = ngroups;
2423 for (i = 0; i < sc->sc_ngroups; i++)
2424 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2425 } else {
2426 struct sockcred *sc;
2427
2428 sc = (void *)CMSG_DATA(mtod(m, struct cmsghdr *));
2429 sc->sc_uid = td->td_ucred->cr_ruid;
2430 sc->sc_euid = td->td_ucred->cr_uid;
2431 sc->sc_gid = td->td_ucred->cr_rgid;
2432 sc->sc_egid = td->td_ucred->cr_gid;
2433 sc->sc_ngroups = ngroups;
2434 for (i = 0; i < sc->sc_ngroups; i++)
2435 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2436 }
2437
2438 /*
2439 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2440 * created SCM_CREDS control message (struct sockcred) has another
2441 * format.
2442 */
2443 if (control != NULL && cmsgtype == SCM_CREDS)
2444 for (n = control, n_prev = NULL; n != NULL;) {
2445 cm = mtod(n, struct cmsghdr *);
2446 if (cm->cmsg_level == SOL_SOCKET &&
2447 cm->cmsg_type == SCM_CREDS) {
2448 if (n_prev == NULL)
2449 control = n->m_next;
2450 else
2451 n_prev->m_next = n->m_next;
2452 n = m_free(n);
2453 } else {
2454 n_prev = n;
2455 n = n->m_next;
2456 }
2457 }
2458
2459 /* Prepend it to the head. */
2460 m->m_next = control;
2461 return (m);
2462}
2463
2464static struct unpcb *
2465fptounp(struct file *fp)
2466{
2467 struct socket *so;
2468
2469 if (fp->f_type != DTYPE_SOCKET)
2470 return (NULL);
2471 if ((so = fp->f_data) == NULL)
2472 return (NULL);
2473 if (so->so_proto->pr_domain != &localdomain)
2474 return (NULL);
2475 return sotounpcb(so);
2476}
2477
2478static void
2479unp_discard(struct file *fp)
2480{
2481 struct unp_defer *dr;
2482
2483 if (unp_externalize_fp(fp)) {
2484 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2485 dr->ud_fp = fp;
2486 UNP_DEFERRED_LOCK();
2487 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2488 UNP_DEFERRED_UNLOCK();
2489 atomic_add_int(&unp_defers_count, 1);
2490 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2491 } else
2492 closef_nothread(fp);
2493}
2494
2495static void
2496unp_process_defers(void *arg __unused, int pending)
2497{
2498 struct unp_defer *dr;
2499 SLIST_HEAD(, unp_defer) drl;
2500 int count;
2501
2502 SLIST_INIT(&drl);
2503 for (;;) {
2504 UNP_DEFERRED_LOCK();
2505 if (SLIST_FIRST(&unp_defers) == NULL) {
2506 UNP_DEFERRED_UNLOCK();
2507 break;
2508 }
2509 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2510 UNP_DEFERRED_UNLOCK();
2511 count = 0;
2512 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2513 SLIST_REMOVE_HEAD(&drl, ud_link);
2514 closef_nothread(dr->ud_fp);
2515 free(dr, M_TEMP);
2516 count++;
2517 }
2518 atomic_add_int(&unp_defers_count, -count);
2519 }
2520}
2521
2522static void
2523unp_internalize_fp(struct file *fp)
2524{
2525 struct unpcb *unp;
2526
2527 UNP_LINK_WLOCK();
2528 if ((unp = fptounp(fp)) != NULL) {
2529 unp->unp_file = fp;
2530 unp->unp_msgcount++;
2531 }
2532 unp_rights++;
2533 UNP_LINK_WUNLOCK();
2534}
2535
2536static int
2537unp_externalize_fp(struct file *fp)
2538{
2539 struct unpcb *unp;
2540 int ret;
2541
2542 UNP_LINK_WLOCK();
2543 if ((unp = fptounp(fp)) != NULL) {
2544 unp->unp_msgcount--;
2545 ret = 1;
2546 } else
2547 ret = 0;
2548 unp_rights--;
2549 UNP_LINK_WUNLOCK();
2550 return (ret);
2551}
2552
2553/*
2554 * unp_defer indicates whether additional work has been defered for a future
2555 * pass through unp_gc(). It is thread local and does not require explicit
2556 * synchronization.
2557 */
2558static int unp_marked;
2559
2560static void
2561unp_remove_dead_ref(struct filedescent **fdep, int fdcount)
2562{
2563 struct unpcb *unp;
2564 struct file *fp;
2565 int i;
2566
2567 /*
2568 * This function can only be called from the gc task.
2569 */
2570 KASSERT(taskqueue_member(taskqueue_thread, curthread) != 0,
2571 ("%s: not on gc callout", __func__));
2572 UNP_LINK_LOCK_ASSERT();
2573
2574 for (i = 0; i < fdcount; i++) {
2575 fp = fdep[i]->fde_file;
2576 if ((unp = fptounp(fp)) == NULL)
2577 continue;
2578 if ((unp->unp_gcflag & UNPGC_DEAD) == 0)
2579 continue;
2580 unp->unp_gcrefs--;
2581 }
2582}
2583
2584static void
2585unp_restore_undead_ref(struct filedescent **fdep, int fdcount)
2586{
2587 struct unpcb *unp;
2588 struct file *fp;
2589 int i;
2590
2591 /*
2592 * This function can only be called from the gc task.
2593 */
2594 KASSERT(taskqueue_member(taskqueue_thread, curthread) != 0,
2595 ("%s: not on gc callout", __func__));
2596 UNP_LINK_LOCK_ASSERT();
2597
2598 for (i = 0; i < fdcount; i++) {
2599 fp = fdep[i]->fde_file;
2600 if ((unp = fptounp(fp)) == NULL)
2601 continue;
2602 if ((unp->unp_gcflag & UNPGC_DEAD) == 0)
2603 continue;
2604 unp->unp_gcrefs++;
2605 unp_marked++;
2606 }
2607}
2608
2609static void
2610unp_gc_scan(struct unpcb *unp, void (*op)(struct filedescent **, int))
2611{
2612 struct socket *so, *soa;
2613
2614 so = unp->unp_socket;
2615 SOCK_LOCK(so);
2616 if (SOLISTENING(so)) {
2617 /*
2618 * Mark all sockets in our accept queue.
2619 */
2620 TAILQ_FOREACH(soa, &so->sol_comp, so_list) {
2621 if (sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS)
2622 continue;
2623 SOCKBUF_LOCK(&soa->so_rcv);
2624 unp_scan(soa->so_rcv.sb_mb, op);
2625 SOCKBUF_UNLOCK(&soa->so_rcv);
2626 }
2627 } else {
2628 /*
2629 * Mark all sockets we reference with RIGHTS.
2630 */
2631 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) {
2632 SOCKBUF_LOCK(&so->so_rcv);
2633 unp_scan(so->so_rcv.sb_mb, op);
2634 SOCKBUF_UNLOCK(&so->so_rcv);
2635 }
2636 }
2637 SOCK_UNLOCK(so);
2638}
2639
2640static int unp_recycled;
2641SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2642 "Number of unreachable sockets claimed by the garbage collector.");
2643
2644static int unp_taskcount;
2645SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2646 "Number of times the garbage collector has run.");
2647
2648SYSCTL_UINT(_net_local, OID_AUTO, sockcount, CTLFLAG_RD, &unp_count, 0,
2649 "Number of active local sockets.");
2650
2651static void
2652unp_gc(__unused void *arg, int pending)
2653{
2654 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2655 NULL };
2656 struct unp_head **head;
2657 struct unp_head unp_deadhead; /* List of potentially-dead sockets. */
2658 struct file *f, **unref;
2659 struct unpcb *unp, *unptmp;
2660 int i, total, unp_unreachable;
2661
2662 LIST_INIT(&unp_deadhead);
2663 unp_taskcount++;
2664 UNP_LINK_RLOCK();
2665 /*
2666 * First determine which sockets may be in cycles.
2667 */
2668 unp_unreachable = 0;
2669
2670 for (head = heads; *head != NULL; head++)
2671 LIST_FOREACH(unp, *head, unp_link) {
2672 KASSERT((unp->unp_gcflag & ~UNPGC_IGNORE_RIGHTS) == 0,
2673 ("%s: unp %p has unexpected gc flags 0x%x",
2674 __func__, unp, (unsigned int)unp->unp_gcflag));
2675
2676 f = unp->unp_file;
2677
2678 /*
2679 * Check for an unreachable socket potentially in a
2680 * cycle. It must be in a queue as indicated by
2681 * msgcount, and this must equal the file reference
2682 * count. Note that when msgcount is 0 the file is
2683 * NULL.
2684 */
2685 if (f != NULL && unp->unp_msgcount != 0 &&
2686 refcount_load(&f->f_count) == unp->unp_msgcount) {
2687 LIST_INSERT_HEAD(&unp_deadhead, unp, unp_dead);
2688 unp->unp_gcflag |= UNPGC_DEAD;
2689 unp->unp_gcrefs = unp->unp_msgcount;
2690 unp_unreachable++;
2691 }
2692 }
2693
2694 /*
2695 * Scan all sockets previously marked as potentially being in a cycle
2696 * and remove the references each socket holds on any UNPGC_DEAD
2697 * sockets in its queue. After this step, all remaining references on
2698 * sockets marked UNPGC_DEAD should not be part of any cycle.
2699 */
2700 LIST_FOREACH(unp, &unp_deadhead, unp_dead)
2701 unp_gc_scan(unp, unp_remove_dead_ref);
2702
2703 /*
2704 * If a socket still has a non-negative refcount, it cannot be in a
2705 * cycle. In this case increment refcount of all children iteratively.
2706 * Stop the scan once we do a complete loop without discovering
2707 * a new reachable socket.
2708 */
2709 do {
2710 unp_marked = 0;
2711 LIST_FOREACH_SAFE(unp, &unp_deadhead, unp_dead, unptmp)
2712 if (unp->unp_gcrefs > 0) {
2713 unp->unp_gcflag &= ~UNPGC_DEAD;
2714 LIST_REMOVE(unp, unp_dead);
2715 KASSERT(unp_unreachable > 0,
2716 ("%s: unp_unreachable underflow.",
2717 __func__));
2718 unp_unreachable--;
2719 unp_gc_scan(unp, unp_restore_undead_ref);
2720 }
2721 } while (unp_marked);
2722
2723 UNP_LINK_RUNLOCK();
2724
2725 if (unp_unreachable == 0)
2726 return;
2727
2728 /*
2729 * Allocate space for a local array of dead unpcbs.
2730 * TODO: can this path be simplified by instead using the local
2731 * dead list at unp_deadhead, after taking out references
2732 * on the file object and/or unpcb and dropping the link lock?
2733 */
2734 unref = malloc(unp_unreachable * sizeof(struct file *),
2735 M_TEMP, M_WAITOK);
2736
2737 /*
2738 * Iterate looking for sockets which have been specifically marked
2739 * as unreachable and store them locally.
2740 */
2741 UNP_LINK_RLOCK();
2742 total = 0;
2743 LIST_FOREACH(unp, &unp_deadhead, unp_dead) {
2744 KASSERT((unp->unp_gcflag & UNPGC_DEAD) != 0,
2745 ("%s: unp %p not marked UNPGC_DEAD", __func__, unp));
2746 unp->unp_gcflag &= ~UNPGC_DEAD;
2747 f = unp->unp_file;
2748 if (unp->unp_msgcount == 0 || f == NULL ||
2749 refcount_load(&f->f_count) != unp->unp_msgcount ||
2750 !fhold(f))
2751 continue;
2752 unref[total++] = f;
2753 KASSERT(total <= unp_unreachable,
2754 ("%s: incorrect unreachable count.", __func__));
2755 }
2756 UNP_LINK_RUNLOCK();
2757
2758 /*
2759 * Now flush all sockets, free'ing rights. This will free the
2760 * struct files associated with these sockets but leave each socket
2761 * with one remaining ref.
2762 */
2763 for (i = 0; i < total; i++) {
2764 struct socket *so;
2765
2766 so = unref[i]->f_data;
2767 CURVNET_SET(so->so_vnet);
2768 sorflush(so);
2769 CURVNET_RESTORE();
2770 }
2771
2772 /*
2773 * And finally release the sockets so they can be reclaimed.
2774 */
2775 for (i = 0; i < total; i++)
2776 fdrop(unref[i], NULL);
2777 unp_recycled += total;
2778 free(unref, M_TEMP);
2779}
2780
2781static void
2782unp_dispose_mbuf(struct mbuf *m)
2783{
2784
2785 if (m)
2786 unp_scan(m, unp_freerights);
2787}
2788
2789/*
2790 * Synchronize against unp_gc, which can trip over data as we are freeing it.
2791 */
2792static void
2793unp_dispose(struct socket *so)
2794{
2795 struct unpcb *unp;
2796
2797 unp = sotounpcb(so);
2798 UNP_LINK_WLOCK();
2799 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
2800 UNP_LINK_WUNLOCK();
2801 if (!SOLISTENING(so))
2802 unp_dispose_mbuf(so->so_rcv.sb_mb);
2803}
2804
2805static void
2806unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2807{
2808 struct mbuf *m;
2809 struct cmsghdr *cm;
2810 void *data;
2811 socklen_t clen, datalen;
2812
2813 while (m0 != NULL) {
2814 for (m = m0; m; m = m->m_next) {
2815 if (m->m_type != MT_CONTROL)
2816 continue;
2817
2818 cm = mtod(m, struct cmsghdr *);
2819 clen = m->m_len;
2820
2821 while (cm != NULL) {
2822 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2823 break;
2824
2825 data = CMSG_DATA(cm);
2826 datalen = (caddr_t)cm + cm->cmsg_len
2827 - (caddr_t)data;
2828
2829 if (cm->cmsg_level == SOL_SOCKET &&
2830 cm->cmsg_type == SCM_RIGHTS) {
2831 (*op)(data, datalen /
2832 sizeof(struct filedescent *));
2833 }
2834
2835 if (CMSG_SPACE(datalen) < clen) {
2836 clen -= CMSG_SPACE(datalen);
2837 cm = (struct cmsghdr *)
2838 ((caddr_t)cm + CMSG_SPACE(datalen));
2839 } else {
2840 clen = 0;
2841 cm = NULL;
2842 }
2843 }
2844 }
2845 m0 = m0->m_nextpkt;
2846 }
2847}
2848
2849/*
2850 * A helper function called by VFS before socket-type vnode reclamation.
2851 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2852 * use count.
2853 */
2854void
2855vfs_unp_reclaim(struct vnode *vp)
2856{
2857 struct unpcb *unp;
2858 int active;
2859 struct mtx *vplock;
2860
2861 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2862 KASSERT(vp->v_type == VSOCK,
2863 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2864
2865 active = 0;
2866 vplock = mtx_pool_find(mtxpool_sleep, vp);
2867 mtx_lock(vplock);
2868 VOP_UNP_CONNECT(vp, &unp);
2869 if (unp == NULL)
2870 goto done;
2871 UNP_PCB_LOCK(unp);
2872 if (unp->unp_vnode == vp) {
2873 VOP_UNP_DETACH(vp);
2874 unp->unp_vnode = NULL;
2875 active = 1;
2876 }
2877 UNP_PCB_UNLOCK(unp);
2878 done:
2879 mtx_unlock(vplock);
2880 if (active)
2881 vunref(vp);
2882}
2883
2884#ifdef DDB
2885static void
2886db_print_indent(int indent)
2887{
2888 int i;
2889
2890 for (i = 0; i < indent; i++)
2891 db_printf(" ");
2892}
2893
2894static void
2895db_print_unpflags(int unp_flags)
2896{
2897 int comma;
2898
2899 comma = 0;
2900 if (unp_flags & UNP_HAVEPC) {
2901 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2902 comma = 1;
2903 }
2904 if (unp_flags & UNP_WANTCRED_ALWAYS) {
2905 db_printf("%sUNP_WANTCRED_ALWAYS", comma ? ", " : "");
2906 comma = 1;
2907 }
2908 if (unp_flags & UNP_WANTCRED_ONESHOT) {
2909 db_printf("%sUNP_WANTCRED_ONESHOT", comma ? ", " : "");
2910 comma = 1;
2911 }
2912 if (unp_flags & UNP_CONNWAIT) {
2913 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2914 comma = 1;
2915 }
2916 if (unp_flags & UNP_CONNECTING) {
2917 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2918 comma = 1;
2919 }
2920 if (unp_flags & UNP_BINDING) {
2921 db_printf("%sUNP_BINDING", comma ? ", " : "");
2922 comma = 1;
2923 }
2924}
2925
2926static void
2927db_print_xucred(int indent, struct xucred *xu)
2928{
2929 int comma, i;
2930
2931 db_print_indent(indent);
2932 db_printf("cr_version: %u cr_uid: %u cr_pid: %d cr_ngroups: %d\n",
2933 xu->cr_version, xu->cr_uid, xu->cr_pid, xu->cr_ngroups);
2934 db_print_indent(indent);
2935 db_printf("cr_groups: ");
2936 comma = 0;
2937 for (i = 0; i < xu->cr_ngroups; i++) {
2938 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2939 comma = 1;
2940 }
2941 db_printf("\n");
2942}
2943
2944static void
2945db_print_unprefs(int indent, struct unp_head *uh)
2946{
2947 struct unpcb *unp;
2948 int counter;
2949
2950 counter = 0;
2951 LIST_FOREACH(unp, uh, unp_reflink) {
2952 if (counter % 4 == 0)
2953 db_print_indent(indent);
2954 db_printf("%p ", unp);
2955 if (counter % 4 == 3)
2956 db_printf("\n");
2957 counter++;
2958 }
2959 if (counter != 0 && counter % 4 != 0)
2960 db_printf("\n");
2961}
2962
2963DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2964{
2965 struct unpcb *unp;
2966
2967 if (!have_addr) {
2968 db_printf("usage: show unpcb <addr>\n");
2969 return;
2970 }
2971 unp = (struct unpcb *)addr;
2972
2973 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2974 unp->unp_vnode);
2975
2976 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2977 unp->unp_conn);
2978
2979 db_printf("unp_refs:\n");
2980 db_print_unprefs(2, &unp->unp_refs);
2981
2982 /* XXXRW: Would be nice to print the full address, if any. */
2983 db_printf("unp_addr: %p\n", unp->unp_addr);
2984
2985 db_printf("unp_gencnt: %llu\n",
2986 (unsigned long long)unp->unp_gencnt);
2987
2988 db_printf("unp_flags: %x (", unp->unp_flags);
2989 db_print_unpflags(unp->unp_flags);
2990 db_printf(")\n");
2991
2992 db_printf("unp_peercred:\n");
2993 db_print_xucred(2, &unp->unp_peercred);
2994
2995 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2996}
2997#endif
ts
struct timespec * ts
Definition: clock_if.m:39
count
int * count
Definition: cpufreq_if.m:63
bt
static struct bt_table bt
Definition: kern_boottrace.c:80
_finstall
void _finstall(struct filedesc *fdp, struct file *fp, int fd, int flags, struct filecaps *fcaps)
Definition: kern_descrip.c:2134
filecaps_copy
bool filecaps_copy(const struct filecaps *src, struct filecaps *dst, bool locked)
Definition: kern_descrip.c:1728
closef_nothread
void closef_nothread(struct file *fp)
Definition: kern_descrip.c:2830
fdallocn
int fdallocn(struct thread *td, int minfd, int *fds, int n)
Definition: kern_descrip.c:2029
filecaps_free
void filecaps_free(struct filecaps *fcaps)
Definition: kern_descrip.c:1809
malloc
void *() malloc(size_t size, struct malloc_type *mtp, int flags)
Definition: kern_malloc.c:632
free
void free(void *addr, struct malloc_type *mtp)
Definition: kern_malloc.c:907
m_freem
void m_freem(struct mbuf *mb)
Definition: kern_mbuf.c:1587
mtxpool_sleep
struct mtx_pool __read_mostly * mtxpool_sleep
Definition: kern_mtxpool.c:84
mtx_pool_find
struct mtx * mtx_pool_find(struct mtx_pool *pool, void *ptr)
Definition: kern_mtxpool.c:101
cru2xt
void cru2xt(struct thread *td, struct xucred *xcr)
Definition: kern_prot.c:2152
cr_cansee
int cr_cansee(struct ucred *u1, struct ucred *u2)
Definition: kern_prot.c:1435
panic
void panic(const char *fmt,...)
Definition: kern_shutdown.c:884
wakeup
void wakeup(const void *ident)
Definition: kern_synch.c:349
nanouptime
void nanouptime(struct timespec *tsp)
Definition: kern_tc.c:397
bintime
void bintime(struct bintime *bt)
Definition: kern_tc.c:415
microtime
void microtime(struct timeval *tvp)
Definition: kern_tc.c:431
nanotime
void nanotime(struct timespec *tsp)
Definition: kern_tc.c:422
domain
struct iommu_domain ** domain
Definition: msi_if.m:96
data
uint32_t * data
Definition: msi_if.m:90
addr
uint64_t * addr
Definition: msi_if.m:89
unp_defer
Definition: uipc_usrreq.c:121
flags
uint16_t flags
Definition: subr_stats.c:2
taskqueue_enqueue
int taskqueue_enqueue(struct taskqueue *queue, struct task *task)
Definition: subr_taskqueue.c:277
taskqueue_member
int taskqueue_member(struct taskqueue *queue, struct thread *td)
Definition: subr_taskqueue.c:868
taskqueue_enqueue_timeout
int taskqueue_enqueue_timeout(struct taskqueue *queue, struct timeout_task *ttask, int ticks)
Definition: subr_taskqueue.c:342
mtx
struct mtx mtx
Definition: uipc_ktls.c:0
soroverflow_locked
void soroverflow_locked(struct socket *so)
Definition: uipc_sockbuf.c:440
sbrelease
void sbrelease(struct sockbuf *sb, struct socket *so)
Definition: uipc_sockbuf.c:733
sbappendcontrol_locked
void sbappendcontrol_locked(struct sockbuf *sb, struct mbuf *m0, struct mbuf *control, int flags)
Definition: uipc_sockbuf.c:1242
socantsendmore
void socantsendmore(struct socket *so)
Definition: uipc_sockbuf.c:407
soreserve
int soreserve(struct socket *so, u_long sndcc, u_long rcvcc)
Definition: uipc_sockbuf.c:556
sbappendaddr_nospacecheck_locked
int sbappendaddr_nospacecheck_locked(struct sockbuf *sb, const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control)
Definition: uipc_sockbuf.c:1212
sbready
int sbready(struct sockbuf *sb, struct mbuf *m0, int count)
Definition: uipc_sockbuf.c:200
sbappend_locked
void sbappend_locked(struct sockbuf *sb, struct mbuf *m, int flags)
Definition: uipc_sockbuf.c:858
sbcreatecontrol
struct mbuf * sbcreatecontrol(caddr_t p, int size, int type, int level)
Definition: uipc_sockbuf.c:1756
socantrcvmore
void socantrcvmore(struct socket *so)
Definition: uipc_sockbuf.c:431
sbappendaddr_locked
int sbappendaddr_locked(struct sockbuf *sb, const struct sockaddr *asa, struct mbuf *m0, struct mbuf *control)
Definition: uipc_sockbuf.c:1186
solisten_proto_check
int solisten_proto_check(struct socket *so)
Definition: uipc_socket.c:909
sorflush
void sorflush(struct socket *so)
Definition: uipc_socket.c:2931
sonewconn
struct socket * sonewconn(struct socket *head, int connstatus)
Definition: uipc_socket.c:597
soisdisconnected
void soisdisconnected(struct socket *so)
Definition: uipc_socket.c:4141
maxsockets
int maxsockets
Definition: uipc_socket.c:280
soisconnected
void soisconnected(struct socket *so)
Definition: uipc_socket.c:4049
sotoxsocket
void sotoxsocket(struct socket *so, struct xsocket *xso)
Definition: uipc_socket.c:4376
sooptcopyin
int sooptcopyin(struct sockopt *sopt, void *buf, size_t len, size_t minlen)
Definition: uipc_socket.c:3015
soreceive_generic
int soreceive_generic(struct socket *so, struct sockaddr **psa, struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
Definition: uipc_socket.c:1961
soisconnecting
void soisconnecting(struct socket *so)
Definition: uipc_socket.c:4039
sodupsockaddr
struct sockaddr * sodupsockaddr(const struct sockaddr *sa, int mflags)
Definition: uipc_socket.c:4206
solisten_proto
void solisten_proto(struct socket *so, int backlog)
Definition: uipc_socket.c:954
soreceive_dgram
int soreceive_dgram(struct socket *so, struct sockaddr **psa, struct uio *uio, struct mbuf **mp0, struct mbuf **controlp, int *flagsp)
Definition: uipc_socket.c:2677
sooptcopyout
int sooptcopyout(struct sockopt *sopt, const void *buf, size_t len)
Definition: uipc_socket.c:3265
so_gencnt
so_gen_t so_gencnt
Definition: uipc_socket.c:198
SLIST_HEAD
static SLIST_HEAD(unp_defer)
Definition: uipc_usrreq.c:125
SYSINIT
SYSINIT(unp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_SECOND, unp_init, NULL)
unpsp_recvspace
static u_long unpsp_recvspace
Definition: uipc_usrreq.c:162
unp_count
static u_int unp_count
Definition: uipc_usrreq.c:114
unp_remove_dead_ref
static void unp_remove_dead_ref(struct filedescent **fdep, int fdcount)
Definition: uipc_usrreq.c:2561
unp_sphead
static struct unp_head unp_sphead
Definition: uipc_usrreq.c:119
uipc_bind
static int uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
Definition: uipc_usrreq.c:702
uipc_usrreqs_dgram
static struct pr_usrreqs uipc_usrreqs_dgram
Definition: uipc_usrreq.c:1316
uipc_connect2
static int uipc_connect2(struct socket *, struct socket *)
Definition: uipc_usrreq.c:764
uipc_shutdown
static int uipc_shutdown(struct socket *so)
Definition: uipc_usrreq.c:1282
unp_disconnect
static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
Definition: uipc_usrreq.c:1734
vfs_unp_reclaim
void vfs_unp_reclaim(struct vnode *vp)
Definition: uipc_usrreq.c:2855
unp_ino
static ino_t unp_ino
Definition: uipc_usrreq.c:115
unp_pcb_lock_peer
static struct unpcb * unp_pcb_lock_peer(struct unpcb *unp)
Definition: uipc_usrreq.c:378
UNP_REF_LIST_LOCK
#define UNP_REF_LIST_LOCK()
Definition: uipc_usrreq.c:275
SYSCTL_INT
SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0, "File descriptors in flight.")
uipc_abort
static void uipc_abort(struct socket *so)
Definition: uipc_usrreq.c:469
uipc_sockaddr
static int uipc_sockaddr(struct socket *so, struct sockaddr **nam)
Definition: uipc_usrreq.c:1297
UNP_PCB_UNLOCK_ASSERT
#define UNP_PCB_UNLOCK_ASSERT(unp)
Definition: uipc_usrreq.c:288
UNP_PCB_LOCK_INIT
#define UNP_PCB_LOCK_INIT(unp)
Definition: uipc_usrreq.c:278
UNP_LINK_WUNLOCK
#define UNP_LINK_WUNLOCK()
Definition: uipc_usrreq.c:265
unpsp_sendspace
static u_long unpsp_sendspace
Definition: uipc_usrreq.c:161
unp_init
static void unp_init(void *arg __unused)
Definition: uipc_usrreq.c:2149
uipc_listen
static int uipc_listen(struct socket *so, int backlog, struct thread *td)
Definition: uipc_usrreq.c:882
UNP_PCB_LOCK
#define UNP_PCB_LOCK(unp)
Definition: uipc_usrreq.c:283
uipc_sense
static int uipc_sense(struct socket *so, struct stat *sb)
Definition: uipc_usrreq.c:1268
unp_gc_scan
static void unp_gc_scan(struct unpcb *unp, void(*op)(struct filedescent **, int))
Definition: uipc_usrreq.c:2610
fptounp
static struct unpcb * fptounp(struct file *fp)
Definition: uipc_usrreq.c:2465
localsw
static struct protosw localsw[]
Definition: uipc_usrreq.c:426
unp_restore_undead_ref
static void unp_restore_undead_ref(struct filedescent **fdep, int fdcount)
Definition: uipc_usrreq.c:2585
SYSCTL_PROC
SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,(void *)(intptr_t) SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb", "List of active local datagram sockets")
unp_dispose
static void unp_dispose(struct socket *so)
Definition: uipc_usrreq.c:2793
uipc_disconnect
static int uipc_disconnect(struct socket *so)
Definition: uipc_usrreq.c:866
MALLOC_DECLARE
MALLOC_DECLARE(M_FILECAPS)
SYSCTL_UINT
SYSCTL_UINT(_net_local, OID_AUTO, sockcount, CTLFLAG_RD, &unp_count, 0, "Number of active local sockets.")
uipc_accept
static int uipc_accept(struct socket *so, struct sockaddr **nam)
Definition: uipc_usrreq.c:488
unp_gc
static void unp_gc(__unused void *, int)
Definition: uipc_usrreq.c:2652
unp_freerights
static void unp_freerights(struct filedescent **, int)
Definition: uipc_usrreq.c:1993
uipc_close
static void uipc_close(struct socket *so)
Definition: uipc_usrreq.c:730
UNP_PCB_LOCKPTR
#define UNP_PCB_LOCKPTR(unp)
Definition: uipc_usrreq.c:282
unp_link_rwlock
static struct rwlock unp_link_rwlock
Definition: uipc_usrreq.c:251
unp_pcb_rele_notlast
static void unp_pcb_rele_notlast(struct unpcb *unp)
Definition: uipc_usrreq.c:338
unpdg_sendspace
static u_long unpdg_sendspace
Definition: uipc_usrreq.c:159
unp_taskcount
static int unp_taskcount
Definition: uipc_usrreq.c:2644
UNP_PCB_UNLOCK
#define UNP_PCB_UNLOCK(unp)
Definition: uipc_usrreq.c:285
uipc_rcvd
static int uipc_rcvd(struct socket *so, int flags)
Definition: uipc_usrreq.c:950
unp_discard
static void unp_discard(struct file *)
Definition: uipc_usrreq.c:2479
unp_internalize_cleanup_rights
static void unp_internalize_cleanup_rights(struct mbuf *control)
Definition: uipc_usrreq.c:2176
UNP_REF_LIST_UNLOCK
#define UNP_REF_LIST_UNLOCK()
Definition: uipc_usrreq.c:276
unp_connect2
static int unp_connect2(struct socket *so, struct socket *so2, int)
Definition: uipc_usrreq.c:1686
unp_copy_peercred
void unp_copy_peercred(struct thread *td, struct unpcb *client_unp, struct unpcb *server_unp, struct unpcb *listen_unp)
Definition: uipc_usrreq.c:1673
SYSCTL_NODE
static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW|CTLFLAG_MPSAFE, 0, "Local domain")
unp_internalize_fp
static void unp_internalize_fp(struct file *)
Definition: uipc_usrreq.c:2523
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static int uipc_peeraddr(struct socket *so, struct sockaddr **nam)
Definition: uipc_usrreq.c:917
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static int uipc_ready(struct socket *so, struct mbuf *m, int count)
Definition: uipc_usrreq.c:1221
UNP_LINK_LOCK_INIT
#define UNP_LINK_LOCK_INIT()
Definition: uipc_usrreq.c:254
UNP_LINK_RLOCK
#define UNP_LINK_RLOCK()
Definition: uipc_usrreq.c:262
unp_dhead
static struct unp_head unp_dhead
Definition: uipc_usrreq.c:118
unp_marked
static int unp_marked
Definition: uipc_usrreq.c:2558
UNP_LINK_WOWNED
#define UNP_LINK_WOWNED()
Definition: uipc_usrreq.c:268
uipc_ready_scan
static bool uipc_ready_scan(struct socket *so, struct mbuf *m, int count, int *errorp)
Definition: uipc_usrreq.c:1188
unp_externalize
static int unp_externalize(struct mbuf *, struct mbuf **, int)
Definition: uipc_usrreq.c:2009
unp_defer_task
static struct task unp_defer_task
Definition: uipc_usrreq.c:143
unpst_recvspace
static u_long unpst_recvspace
Definition: uipc_usrreq.c:158
unp_rights
static int unp_rights
Definition: uipc_usrreq.c:116
uipc_bindat
static int uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
Definition: uipc_usrreq.c:587
unp_dispose_mbuf
static void unp_dispose_mbuf(struct mbuf *)
Definition: uipc_usrreq.c:2782
unp_process_defers
static void unp_process_defers(void *__unused, int)
unp_connect
static int unp_connect(struct socket *, struct sockaddr *, struct thread *)
Definition: uipc_usrreq.c:1494
uipc_usrreqs_stream
static struct pr_usrreqs uipc_usrreqs_dgram uipc_usrreqs_stream
Definition: uipc_usrreq.c:424
UNP_PCB_LOCK_ASSERT
#define UNP_PCB_LOCK_ASSERT(unp)
Definition: uipc_usrreq.c:287
uipc_ctloutput
static int uipc_ctloutput(struct socket *, struct sockopt *)
Definition: uipc_usrreq.c:1384
__FBSDID
__FBSDID("$FreeBSD$")
unp_shutdown
static void unp_shutdown(struct unpcb *)
Definition: uipc_usrreq.c:1951
unp_externalize_fp
static int unp_externalize_fp(struct file *)
Definition: uipc_usrreq.c:2537
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static struct timeout_task unp_gc_task
Definition: uipc_usrreq.c:136
UNP_LINK_RUNLOCK
#define UNP_LINK_RUNLOCK()
Definition: uipc_usrreq.c:263
PIPSIZ
#define PIPSIZ
Definition: uipc_usrreq.c:155
unp_gencnt
static unp_gen_t unp_gencnt
Definition: uipc_usrreq.c:113
uipc_usrreqs_seqpacket
static struct pr_usrreqs uipc_usrreqs_seqpacket
Definition: uipc_usrreq.c:425
UNP_DEFERRED_UNLOCK
#define UNP_DEFERRED_UNLOCK()
Definition: uipc_usrreq.c:273
uipc_attach
static int uipc_attach(struct socket *so, int proto, struct thread *td)
Definition: uipc_usrreq.c:516
unp_pcb_unlock_pair
static void unp_pcb_unlock_pair(struct unpcb *unp, struct unpcb *unp2)
Definition: uipc_usrreq.c:364
UNP_LINK_UNLOCK_ASSERT
#define UNP_LINK_UNLOCK_ASSERT()
Definition: uipc_usrreq.c:259
OPTSET
#define OPTSET(bit, exclusive)
unp_drop
static void unp_drop(struct unpcb *)
Definition: uipc_usrreq.c:1968
unp_scan
static void unp_scan(struct mbuf *, void(*)(struct filedescent **, int))
Definition: uipc_usrreq.c:2806
unp_defers_lock
static struct mtx unp_defers_lock
Definition: uipc_usrreq.c:252
unp_shead
static struct unp_head unp_shead
Definition: uipc_usrreq.c:117
SYSCTL_ULONG
SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW, &unpst_sendspace, 0, "Default stream send space.")
uipc_connect
static int uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
Definition: uipc_usrreq.c:709
uipc_detach
static void uipc_detach(struct socket *so)
Definition: uipc_usrreq.c:780
UNP_LINK_WLOCK
#define UNP_LINK_WLOCK()
Definition: uipc_usrreq.c:264
unp_pcb_hold
static void unp_pcb_hold(struct unpcb *unp)
Definition: uipc_usrreq.c:314
unp_recycled
static int unp_recycled
Definition: uipc_usrreq.c:2640
unp_pcb_rele
static __result_use_check bool unp_pcb_rele(struct unpcb *unp)
Definition: uipc_usrreq.c:323
DOMAIN_SET
DOMAIN_SET(local)
UNP_DEFERRED_LOCK_INIT
#define UNP_DEFERRED_LOCK_INIT()
Definition: uipc_usrreq.c:270
unp_zone_change
static void unp_zone_change(void *tag)
Definition: uipc_usrreq.c:2121
UNP_PCB_LOCK_DESTROY
#define UNP_PCB_LOCK_DESTROY(unp)
Definition: uipc_usrreq.c:281
UNP_LINK_LOCK_ASSERT
#define UNP_LINK_LOCK_ASSERT()
Definition: uipc_usrreq.c:257
UNP_DEFERRED_LOCK
#define UNP_DEFERRED_LOCK()
Definition: uipc_usrreq.c:272
unp_connectat
static int unp_connectat(int, struct socket *, struct sockaddr *, struct thread *)
Definition: uipc_usrreq.c:1501
unp_pcb_lock_pair
static void unp_pcb_lock_pair(struct unpcb *unp, struct unpcb *unp2)
Definition: uipc_usrreq.c:347
uipc_send
static int uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam, struct mbuf *control, struct thread *td)
Definition: uipc_usrreq.c:1000
UNP_PCB_TRYLOCK
#define UNP_PCB_TRYLOCK(unp)
Definition: uipc_usrreq.c:284
unp_addsockcred
static struct mbuf * unp_addsockcred(struct thread *, struct mbuf *, int)
Definition: uipc_usrreq.c:2392
unpst_sendspace
static u_long unpst_sendspace
Definition: uipc_usrreq.c:157
unpdg_recvspace
static u_long unpdg_recvspace
Definition: uipc_usrreq.c:160
unp_zone
static uma_zone_t unp_zone
Definition: uipc_usrreq.c:112
localdomain
static struct domain localdomain
Definition: uipc_usrreq.c:423
unp_internalize
static int unp_internalize(struct mbuf **, struct thread *)
Definition: uipc_usrreq.c:2195
unp_pcblist
static int unp_pcblist(SYSCTL_HANDLER_ARGS)
Definition: uipc_usrreq.c:1800
uipc_connectat
static int uipc_connectat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
Definition: uipc_usrreq.c:719
NDFREE
void() NDFREE(struct nameidata *ndp, const u_int flags)
Definition: vfs_lookup.c:1555
namei
int namei(struct nameidata *ndp)
Definition: vfs_lookup.c:535
vref
void vref(struct vnode *vp)
Definition: vfs_subr.c:3065
vrele
void vrele(struct vnode *vp)
Definition: vfs_subr.c:3334
vput
void vput(struct vnode *vp)
Definition: vfs_subr.c:3348
vunref
void vunref(struct vnode *vp)
Definition: vfs_subr.c:3365
buf
struct stat * buf
Definition: vfs_syscalls.c:2423
fd
int fd
Definition: vfs_syscalls.c:2421
mode
mode_t mode
Definition: vfs_syscalls.c:2910
vn_start_write
int vn_start_write(struct vnode *vp, struct mount **mpp, int flags)
Definition: vfs_vnops.c:1901
vn_finished_write
void vn_finished_write(struct mount *mp)
Definition: vfs_vnops.c:2009