1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2004-2009 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * From: @(#)uipc_usrreq.c 8.3 (Berkeley) 1/4/94
32 */
33
34 /*
35 * UNIX Domain (Local) Sockets
36 *
37 * This is an implementation of UNIX (local) domain sockets. Each socket has
38 * an associated struct unpcb (UNIX protocol control block). Stream sockets
39 * may be connected to 0 or 1 other socket. Datagram sockets may be
40 * connected to 0, 1, or many other sockets. Sockets may be created and
41 * connected in pairs (socketpair(2)), or bound/connected to using the file
42 * system name space. For most purposes, only the receive socket buffer is
43 * used, as sending on one socket delivers directly to the receive socket
44 * buffer of a second socket.
45 *
46 * The implementation is substantially complicated by the fact that
47 * "ancillary data", such as file descriptors or credentials, may be passed
48 * across UNIX domain sockets. The potential for passing UNIX domain sockets
49 * over other UNIX domain sockets requires the implementation of a simple
50 * garbage collector to find and tear down cycles of disconnected sockets.
51 *
52 * TODO:
53 * RDM
54 * rethink name space problems
55 * need a proper out-of-band
56 */
57
58 #include <sys/cdefs.h>
59 __FBSDID("$FreeBSD$");
60
61 #include "opt_ddb.h"
62
63 #include <sys/param.h>
64 #include <sys/capsicum.h>
65 #include <sys/domain.h>
66 #include <sys/fcntl.h>
67 #include <sys/malloc.h> /* XXX must be before <sys/file.h> */
68 #include <sys/eventhandler.h>
69 #include <sys/file.h>
70 #include <sys/filedesc.h>
71 #include <sys/kernel.h>
72 #include <sys/lock.h>
73 #include <sys/mbuf.h>
74 #include <sys/mount.h>
75 #include <sys/mutex.h>
76 #include <sys/namei.h>
77 #include <sys/proc.h>
78 #include <sys/protosw.h>
79 #include <sys/queue.h>
80 #include <sys/resourcevar.h>
81 #include <sys/rwlock.h>
82 #include <sys/socket.h>
83 #include <sys/socketvar.h>
84 #include <sys/signalvar.h>
85 #include <sys/stat.h>
86 #include <sys/sx.h>
87 #include <sys/sysctl.h>
88 #include <sys/systm.h>
89 #include <sys/taskqueue.h>
90 #include <sys/un.h>
91 #include <sys/unpcb.h>
92 #include <sys/vnode.h>
93
94 #include <net/vnet.h>
95
96 #ifdef DDB
97 #include <ddb/ddb.h>
98 #endif
99
100 #include <security/mac/mac_framework.h>
101
102 #include <vm/uma.h>
103
104 MALLOC_DECLARE(M_FILECAPS);
105
106 /*
107 * Locking key:
108 * (l) Locked using list lock
109 * (g) Locked using linkage lock
110 */
111
112 static uma_zone_t unp_zone;
113 static unp_gen_t unp_gencnt; /* (l) */
114 static u_int unp_count; /* (l) Count of local sockets. */
115 static ino_t unp_ino; /* Prototype for fake inode numbers. */
116 static int unp_rights; /* (g) File descriptors in flight. */
117 static struct unp_head unp_shead; /* (l) List of stream sockets. */
118 static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
119 static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
120
121 struct unp_defer {
122 SLIST_ENTRY(unp_defer) ud_link;
123 struct file *ud_fp;
124 };
125 static SLIST_HEAD(, unp_defer) unp_defers;
126 static int unp_defers_count;
127
128 static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
129
130 /*
131 * Garbage collection of cyclic file descriptor/socket references occurs
132 * asynchronously in a taskqueue context in order to avoid recursion and
133 * reentrance in the UNIX domain socket, file descriptor, and socket layer
134 * code. See unp_gc() for a full description.
135 */
136 static struct timeout_task unp_gc_task;
137
138 /*
139 * The close of unix domain sockets attached as SCM_RIGHTS is
140 * postponed to the taskqueue, to avoid arbitrary recursion depth.
141 * The attached sockets might have another sockets attached.
142 */
143 static struct task unp_defer_task;
144
145 /*
146 * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
147 * stream sockets, although the total for sender and receiver is actually
148 * only PIPSIZ.
149 *
150 * Datagram sockets really use the sendspace as the maximum datagram size,
151 * and don't really want to reserve the sendspace. Their recvspace should be
152 * large enough for at least one max-size datagram plus address.
153 */
154 #ifndef PIPSIZ
155 #define PIPSIZ 8192
156 #endif
157 static u_long unpst_sendspace = PIPSIZ;
158 static u_long unpst_recvspace = PIPSIZ;
159 static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
160 static u_long unpdg_recvspace = 4*1024;
161 static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
162 static u_long unpsp_recvspace = PIPSIZ;
163
164 static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
165 static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
166 "SOCK_STREAM");
167 static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
168 static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
169 "SOCK_SEQPACKET");
170
171 SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
172 &unpst_sendspace, 0, "Default stream send space.");
173 SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
174 &unpst_recvspace, 0, "Default stream receive space.");
175 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
176 &unpdg_sendspace, 0, "Default datagram send space.");
177 SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
178 &unpdg_recvspace, 0, "Default datagram receive space.");
179 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
180 &unpsp_sendspace, 0, "Default seqpacket send space.");
181 SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
182 &unpsp_recvspace, 0, "Default seqpacket receive space.");
183 SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
184 "File descriptors in flight.");
185 SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
186 &unp_defers_count, 0,
187 "File descriptors deferred to taskqueue for close.");
188
189 /*
190 * Locking and synchronization:
191 *
192 * Three types of locks exit in the local domain socket implementation: a
193 * global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the
194 * global locks, the list lock protects the socket count, global generation
195 * number, and stream/datagram global lists. The linkage lock protects the
196 * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
197 * held exclusively over the acquisition of multiple unpcb locks to prevent
198 * deadlock.
199 *
200 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
201 * allocated in pru_attach() and freed in pru_detach(). The validity of that
202 * pointer is an invariant, so no lock is required to dereference the so_pcb
203 * pointer if a valid socket reference is held by the caller. In practice,
204 * this is always true during operations performed on a socket. Each unpcb
205 * has a back-pointer to its socket, unp_socket, which will be stable under
206 * the same circumstances.
207 *
208 * This pointer may only be safely dereferenced as long as a valid reference
209 * to the unpcb is held. Typically, this reference will be from the socket,
210 * or from another unpcb when the referring unpcb's lock is held (in order
211 * that the reference not be invalidated during use). For example, to follow
212 * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
213 * as unp_socket remains valid as long as the reference to unp_conn is valid.
214 *
215 * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
216 * atomic reads without the lock may be performed "lockless", but more
217 * complex reads and read-modify-writes require the mutex to be held. No
218 * lock order is defined between unpcb locks -- multiple unpcb locks may be
219 * acquired at the same time only when holding the linkage rwlock
220 * exclusively, which prevents deadlocks.
221 *
222 * Blocking with UNIX domain sockets is a tricky issue: unlike most network
223 * protocols, bind() is a non-atomic operation, and connect() requires
224 * potential sleeping in the protocol, due to potentially waiting on local or
225 * distributed file systems. We try to separate "lookup" operations, which
226 * may sleep, and the IPC operations themselves, which typically can occur
227 * with relative atomicity as locks can be held over the entire operation.
228 *
229 * Another tricky issue is simultaneous multi-threaded or multi-process
230 * access to a single UNIX domain socket. These are handled by the flags
231 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
232 * binding, both of which involve dropping UNIX domain socket locks in order
233 * to perform namei() and other file system operations.
234 */
235 static struct rwlock unp_link_rwlock;
236 static struct mtx unp_list_lock;
237 static struct mtx unp_defers_lock;
238
239 #define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
240 "unp_link_rwlock")
241
242 #define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
243 RA_LOCKED)
244 #define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
245 RA_UNLOCKED)
246
247 #define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
248 #define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
249 #define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
250 #define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
251 #define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
252 RA_WLOCKED)
253
254 #define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \
255 "unp_list_lock", NULL, MTX_DEF)
256 #define UNP_LIST_LOCK() mtx_lock(&unp_list_lock)
257 #define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock)
258
259 #define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
260 "unp_defer", NULL, MTX_DEF)
261 #define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
262 #define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
263
264 #define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
265 "unp_mtx", "unp_mtx", \
266 MTX_DUPOK|MTX_DEF|MTX_RECURSE)
267 #define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
268 #define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
269 #define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
270 #define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
271
272 static int uipc_connect2(struct socket *, struct socket *);
273 static int uipc_ctloutput(struct socket *, struct sockopt *);
274 static int unp_connect(struct socket *, struct sockaddr *,
275 struct thread *);
276 static int unp_connectat(int, struct socket *, struct sockaddr *,
277 struct thread *);
278 static int unp_connect2(struct socket *so, struct socket *so2, int);
279 static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
280 static void unp_dispose(struct mbuf *);
281 static void unp_dispose_so(struct socket *so);
282 static void unp_shutdown(struct unpcb *);
283 static void unp_drop(struct unpcb *);
284 static void unp_gc(__unused void *, int);
285 static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
286 static void unp_discard(struct file *);
287 static void unp_freerights(struct filedescent **, int);
288 static void unp_init(void);
289 static int unp_internalize(struct mbuf **, struct thread *);
290 static void unp_internalize_fp(struct file *);
291 static int unp_externalize(struct mbuf *, struct mbuf **, int);
292 static int unp_externalize_fp(struct file *);
293 static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
294 static void unp_process_defers(void * __unused, int);
295
296 /*
297 * Definitions of protocols supported in the LOCAL domain.
298 */
299 static struct domain localdomain;
300 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
301 static struct pr_usrreqs uipc_usrreqs_seqpacket;
302 static struct protosw localsw[] = {
303 {
304 .pr_type = SOCK_STREAM,
305 .pr_domain = &localdomain,
306 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
307 .pr_ctloutput = &uipc_ctloutput,
308 .pr_usrreqs = &uipc_usrreqs_stream
309 },
310 {
311 .pr_type = SOCK_DGRAM,
312 .pr_domain = &localdomain,
313 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
314 .pr_ctloutput = &uipc_ctloutput,
315 .pr_usrreqs = &uipc_usrreqs_dgram
316 },
317 {
318 .pr_type = SOCK_SEQPACKET,
319 .pr_domain = &localdomain,
320
321 /*
322 * XXXRW: For now, PR_ADDR because soreceive will bump into them
323 * due to our use of sbappendaddr. A new sbappend variants is needed
324 * that supports both atomic record writes and control data.
325 */
326 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
327 PR_RIGHTS,
328 .pr_ctloutput = &uipc_ctloutput,
329 .pr_usrreqs = &uipc_usrreqs_seqpacket,
330 },
331 };
332
333 static struct domain localdomain = {
334 .dom_family = AF_LOCAL,
335 .dom_name = "local",
336 .dom_init = unp_init,
337 .dom_externalize = unp_externalize,
338 .dom_dispose = unp_dispose_so,
339 .dom_protosw = localsw,
340 .dom_protoswNPROTOSW = &localsw[nitems(localsw)]
341 };
342 DOMAIN_SET(local);
343
344 static void
345 uipc_abort(struct socket *so)
346 {
347 struct unpcb *unp, *unp2;
348
349 unp = sotounpcb(so);
350 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
351
352 UNP_LINK_WLOCK();
353 UNP_PCB_LOCK(unp);
354 unp2 = unp->unp_conn;
355 if (unp2 != NULL) {
356 UNP_PCB_LOCK(unp2);
357 unp_drop(unp2);
358 UNP_PCB_UNLOCK(unp2);
359 }
360 UNP_PCB_UNLOCK(unp);
361 UNP_LINK_WUNLOCK();
362 }
363
364 static int
365 uipc_accept(struct socket *so, struct sockaddr **nam)
366 {
367 struct unpcb *unp, *unp2;
368 const struct sockaddr *sa;
369
370 /*
371 * Pass back name of connected socket, if it was bound and we are
372 * still connected (our peer may have closed already!).
373 */
374 unp = sotounpcb(so);
375 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
376
377 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
378 UNP_LINK_RLOCK();
379 unp2 = unp->unp_conn;
380 if (unp2 != NULL && unp2->unp_addr != NULL) {
381 UNP_PCB_LOCK(unp2);
382 sa = (struct sockaddr *) unp2->unp_addr;
383 bcopy(sa, *nam, sa->sa_len);
384 UNP_PCB_UNLOCK(unp2);
385 } else {
386 sa = &sun_noname;
387 bcopy(sa, *nam, sa->sa_len);
388 }
389 UNP_LINK_RUNLOCK();
390 return (0);
391 }
392
393 static int
394 uipc_attach(struct socket *so, int proto, struct thread *td)
395 {
396 u_long sendspace, recvspace;
397 struct unpcb *unp;
398 int error;
399
400 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
401 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
402 switch (so->so_type) {
403 case SOCK_STREAM:
404 sendspace = unpst_sendspace;
405 recvspace = unpst_recvspace;
406 break;
407
408 case SOCK_DGRAM:
409 sendspace = unpdg_sendspace;
410 recvspace = unpdg_recvspace;
411 break;
412
413 case SOCK_SEQPACKET:
414 sendspace = unpsp_sendspace;
415 recvspace = unpsp_recvspace;
416 break;
417
418 default:
419 panic("uipc_attach");
420 }
421 error = soreserve(so, sendspace, recvspace);
422 if (error)
423 return (error);
424 }
425 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
426 if (unp == NULL)
427 return (ENOBUFS);
428 LIST_INIT(&unp->unp_refs);
429 UNP_PCB_LOCK_INIT(unp);
430 unp->unp_socket = so;
431 so->so_pcb = unp;
432 unp->unp_refcount = 1;
433 if (so->so_head != NULL)
434 unp->unp_flags |= UNP_NASCENT;
435
436 UNP_LIST_LOCK();
437 unp->unp_gencnt = ++unp_gencnt;
438 unp_count++;
439 switch (so->so_type) {
440 case SOCK_STREAM:
441 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
442 break;
443
444 case SOCK_DGRAM:
445 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
446 break;
447
448 case SOCK_SEQPACKET:
449 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
450 break;
451
452 default:
453 panic("uipc_attach");
454 }
455 UNP_LIST_UNLOCK();
456
457 return (0);
458 }
459
460 static int
461 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
462 {
463 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
464 struct vattr vattr;
465 int error, namelen;
466 struct nameidata nd;
467 struct unpcb *unp;
468 struct vnode *vp;
469 struct mount *mp;
470 cap_rights_t rights;
471 char *buf;
472
473 if (nam->sa_family != AF_UNIX)
474 return (EAFNOSUPPORT);
475
476 unp = sotounpcb(so);
477 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
478
479 if (soun->sun_len > sizeof(struct sockaddr_un))
480 return (EINVAL);
481 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
482 if (namelen <= 0)
483 return (EINVAL);
484
485 /*
486 * We don't allow simultaneous bind() calls on a single UNIX domain
487 * socket, so flag in-progress operations, and return an error if an
488 * operation is already in progress.
489 *
490 * Historically, we have not allowed a socket to be rebound, so this
491 * also returns an error. Not allowing re-binding simplifies the
492 * implementation and avoids a great many possible failure modes.
493 */
494 UNP_PCB_LOCK(unp);
495 if (unp->unp_vnode != NULL) {
496 UNP_PCB_UNLOCK(unp);
497 return (EINVAL);
498 }
499 if (unp->unp_flags & UNP_BINDING) {
500 UNP_PCB_UNLOCK(unp);
501 return (EALREADY);
502 }
503 unp->unp_flags |= UNP_BINDING;
504 UNP_PCB_UNLOCK(unp);
505
506 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
507 bcopy(soun->sun_path, buf, namelen);
508 buf[namelen] = 0;
509
510 restart:
511 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE,
512 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td);
513 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
514 error = namei(&nd);
515 if (error)
516 goto error;
517 vp = nd.ni_vp;
518 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
519 NDFREE(&nd, NDF_ONLY_PNBUF);
520 if (nd.ni_dvp == vp)
521 vrele(nd.ni_dvp);
522 else
523 vput(nd.ni_dvp);
524 if (vp != NULL) {
525 vrele(vp);
526 error = EADDRINUSE;
527 goto error;
528 }
529 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
530 if (error)
531 goto error;
532 goto restart;
533 }
534 VATTR_NULL(&vattr);
535 vattr.va_type = VSOCK;
536 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
537 #ifdef MAC
538 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
539 &vattr);
540 #endif
541 if (error == 0)
542 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
543 NDFREE(&nd, NDF_ONLY_PNBUF);
544 vput(nd.ni_dvp);
545 if (error) {
546 vn_finished_write(mp);
547 goto error;
548 }
549 vp = nd.ni_vp;
550 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
551 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
552
553 UNP_LINK_WLOCK();
554 UNP_PCB_LOCK(unp);
555 VOP_UNP_BIND(vp, unp->unp_socket);
556 unp->unp_vnode = vp;
557 unp->unp_addr = soun;
558 unp->unp_flags &= ~UNP_BINDING;
559 UNP_PCB_UNLOCK(unp);
560 UNP_LINK_WUNLOCK();
561 VOP_UNLOCK(vp, 0);
562 vn_finished_write(mp);
563 free(buf, M_TEMP);
564 return (0);
565
566 error:
567 UNP_PCB_LOCK(unp);
568 unp->unp_flags &= ~UNP_BINDING;
569 UNP_PCB_UNLOCK(unp);
570 free(buf, M_TEMP);
571 return (error);
572 }
573
574 static int
575 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
576 {
577
578 return (uipc_bindat(AT_FDCWD, so, nam, td));
579 }
580
581 static int
582 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
583 {
584 int error;
585
586 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
587 UNP_LINK_WLOCK();
588 error = unp_connect(so, nam, td);
589 UNP_LINK_WUNLOCK();
590 return (error);
591 }
592
593 static int
594 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
595 struct thread *td)
596 {
597 int error;
598
599 KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
600 UNP_LINK_WLOCK();
601 error = unp_connectat(fd, so, nam, td);
602 UNP_LINK_WUNLOCK();
603 return (error);
604 }
605
606 static void
607 uipc_close(struct socket *so)
608 {
609 struct unpcb *unp, *unp2;
610
611 unp = sotounpcb(so);
612 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
613
614 UNP_LINK_WLOCK();
615 UNP_PCB_LOCK(unp);
616 unp2 = unp->unp_conn;
617 if (unp2 != NULL) {
618 UNP_PCB_LOCK(unp2);
619 unp_disconnect(unp, unp2);
620 UNP_PCB_UNLOCK(unp2);
621 }
622 UNP_PCB_UNLOCK(unp);
623 UNP_LINK_WUNLOCK();
624 }
625
626 static int
627 uipc_connect2(struct socket *so1, struct socket *so2)
628 {
629 struct unpcb *unp, *unp2;
630 int error;
631
632 UNP_LINK_WLOCK();
633 unp = so1->so_pcb;
634 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
635 UNP_PCB_LOCK(unp);
636 unp2 = so2->so_pcb;
637 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
638 UNP_PCB_LOCK(unp2);
639 error = unp_connect2(so1, so2, PRU_CONNECT2);
640 UNP_PCB_UNLOCK(unp2);
641 UNP_PCB_UNLOCK(unp);
642 UNP_LINK_WUNLOCK();
643 return (error);
644 }
645
646 static void
647 uipc_detach(struct socket *so)
648 {
649 struct unpcb *unp, *unp2;
650 struct sockaddr_un *saved_unp_addr;
651 struct vnode *vp;
652 int freeunp, local_unp_rights;
653
654 unp = sotounpcb(so);
655 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
656
657 vp = NULL;
658 local_unp_rights = 0;
659
660 UNP_LIST_LOCK();
661 LIST_REMOVE(unp, unp_link);
662 unp->unp_gencnt = ++unp_gencnt;
663 --unp_count;
664 UNP_LIST_UNLOCK();
665
666 if ((unp->unp_flags & UNP_NASCENT) != 0) {
667 UNP_PCB_LOCK(unp);
668 goto teardown;
669 }
670 UNP_LINK_WLOCK();
671 UNP_PCB_LOCK(unp);
672
673 /*
674 * XXXRW: Should assert vp->v_socket == so.
675 */
676 if ((vp = unp->unp_vnode) != NULL) {
677 VOP_UNP_DETACH(vp);
678 unp->unp_vnode = NULL;
679 }
680 unp2 = unp->unp_conn;
681 if (unp2 != NULL) {
682 UNP_PCB_LOCK(unp2);
683 unp_disconnect(unp, unp2);
684 UNP_PCB_UNLOCK(unp2);
685 }
686
687 /*
688 * We hold the linkage lock exclusively, so it's OK to acquire
689 * multiple pcb locks at a time.
690 */
691 while (!LIST_EMPTY(&unp->unp_refs)) {
692 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
693
694 UNP_PCB_LOCK(ref);
695 unp_drop(ref);
696 UNP_PCB_UNLOCK(ref);
697 }
698 local_unp_rights = unp_rights;
699 UNP_LINK_WUNLOCK();
700 teardown:
701 unp->unp_socket->so_pcb = NULL;
702 saved_unp_addr = unp->unp_addr;
703 unp->unp_addr = NULL;
704 unp->unp_refcount--;
705 freeunp = (unp->unp_refcount == 0);
706 if (saved_unp_addr != NULL)
707 free(saved_unp_addr, M_SONAME);
708 if (freeunp) {
709 UNP_PCB_LOCK_DESTROY(unp);
710 uma_zfree(unp_zone, unp);
711 } else
712 UNP_PCB_UNLOCK(unp);
713 if (vp)
714 vrele(vp);
715 if (local_unp_rights)
716 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
717 }
718
719 static int
720 uipc_disconnect(struct socket *so)
721 {
722 struct unpcb *unp, *unp2;
723
724 unp = sotounpcb(so);
725 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
726
727 UNP_LINK_WLOCK();
728 UNP_PCB_LOCK(unp);
729 unp2 = unp->unp_conn;
730 if (unp2 != NULL) {
731 UNP_PCB_LOCK(unp2);
732 unp_disconnect(unp, unp2);
733 UNP_PCB_UNLOCK(unp2);
734 }
735 UNP_PCB_UNLOCK(unp);
736 UNP_LINK_WUNLOCK();
737 return (0);
738 }
739
740 static int
741 uipc_listen(struct socket *so, int backlog, struct thread *td)
742 {
743 struct unpcb *unp;
744 int error;
745
746 unp = sotounpcb(so);
747 KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
748
749 UNP_PCB_LOCK(unp);
750 if (unp->unp_vnode == NULL) {
751 /* Already connected or not bound to an address. */
752 error = unp->unp_conn != NULL ? EINVAL : EDESTADDRREQ;
753 UNP_PCB_UNLOCK(unp);
754 return (error);
755 }
756
757 SOCK_LOCK(so);
758 error = solisten_proto_check(so);
759 if (error == 0) {
760 cru2x(td->td_ucred, &unp->unp_peercred);
761 unp->unp_flags |= UNP_HAVEPCCACHED;
762 solisten_proto(so, backlog);
763 }
764 SOCK_UNLOCK(so);
765 UNP_PCB_UNLOCK(unp);
766 return (error);
767 }
768
769 static int
770 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
771 {
772 struct unpcb *unp, *unp2;
773 const struct sockaddr *sa;
774
775 unp = sotounpcb(so);
776 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
777
778 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
779 UNP_LINK_RLOCK();
780 /*
781 * XXX: It seems that this test always fails even when connection is
782 * established. So, this else clause is added as workaround to
783 * return PF_LOCAL sockaddr.
784 */
785 unp2 = unp->unp_conn;
786 if (unp2 != NULL) {
787 UNP_PCB_LOCK(unp2);
788 if (unp2->unp_addr != NULL)
789 sa = (struct sockaddr *) unp2->unp_addr;
790 else
791 sa = &sun_noname;
792 bcopy(sa, *nam, sa->sa_len);
793 UNP_PCB_UNLOCK(unp2);
794 } else {
795 sa = &sun_noname;
796 bcopy(sa, *nam, sa->sa_len);
797 }
798 UNP_LINK_RUNLOCK();
799 return (0);
800 }
801
802 static int
803 uipc_rcvd(struct socket *so, int flags)
804 {
805 struct unpcb *unp, *unp2;
806 struct socket *so2;
807 u_int mbcnt, sbcc;
808
809 unp = sotounpcb(so);
810 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
811 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET,
812 ("%s: socktype %d", __func__, so->so_type));
813
814 /*
815 * Adjust backpressure on sender and wakeup any waiting to write.
816 *
817 * The unp lock is acquired to maintain the validity of the unp_conn
818 * pointer; no lock on unp2 is required as unp2->unp_socket will be
819 * static as long as we don't permit unp2 to disconnect from unp,
820 * which is prevented by the lock on unp. We cache values from
821 * so_rcv to avoid holding the so_rcv lock over the entire
822 * transaction on the remote so_snd.
823 */
824 SOCKBUF_LOCK(&so->so_rcv);
825 mbcnt = so->so_rcv.sb_mbcnt;
826 sbcc = sbavail(&so->so_rcv);
827 SOCKBUF_UNLOCK(&so->so_rcv);
828 /*
829 * There is a benign race condition at this point. If we're planning to
830 * clear SB_STOP, but uipc_send is called on the connected socket at
831 * this instant, it might add data to the sockbuf and set SB_STOP. Then
832 * we would erroneously clear SB_STOP below, even though the sockbuf is
833 * full. The race is benign because the only ill effect is to allow the
834 * sockbuf to exceed its size limit, and the size limits are not
835 * strictly guaranteed anyway.
836 */
837 UNP_PCB_LOCK(unp);
838 unp2 = unp->unp_conn;
839 if (unp2 == NULL) {
840 UNP_PCB_UNLOCK(unp);
841 return (0);
842 }
843 so2 = unp2->unp_socket;
844 SOCKBUF_LOCK(&so2->so_snd);
845 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
846 so2->so_snd.sb_flags &= ~SB_STOP;
847 sowwakeup_locked(so2);
848 UNP_PCB_UNLOCK(unp);
849 return (0);
850 }
851
852 static int
853 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
854 struct mbuf *control, struct thread *td)
855 {
856 struct unpcb *unp, *unp2;
857 struct socket *so2;
858 u_int mbcnt, sbcc;
859 int error = 0;
860
861 unp = sotounpcb(so);
862 KASSERT(unp != NULL, ("%s: unp == NULL", __func__));
863 KASSERT(so->so_type == SOCK_STREAM || so->so_type == SOCK_DGRAM ||
864 so->so_type == SOCK_SEQPACKET,
865 ("%s: socktype %d", __func__, so->so_type));
866
867 if (flags & PRUS_OOB) {
868 error = EOPNOTSUPP;
869 goto release;
870 }
871 if (control != NULL && (error = unp_internalize(&control, td)))
872 goto release;
873 if ((nam != NULL) || (flags & PRUS_EOF))
874 UNP_LINK_WLOCK();
875 else
876 UNP_LINK_RLOCK();
877 switch (so->so_type) {
878 case SOCK_DGRAM:
879 {
880 const struct sockaddr *from;
881
882 unp2 = unp->unp_conn;
883 if (nam != NULL) {
884 UNP_LINK_WLOCK_ASSERT();
885 if (unp2 != NULL) {
886 error = EISCONN;
887 break;
888 }
889 error = unp_connect(so, nam, td);
890 if (error)
891 break;
892 unp2 = unp->unp_conn;
893 }
894
895 /*
896 * Because connect() and send() are non-atomic in a sendto()
897 * with a target address, it's possible that the socket will
898 * have disconnected before the send() can run. In that case
899 * return the slightly counter-intuitive but otherwise
900 * correct error that the socket is not connected.
901 */
902 if (unp2 == NULL) {
903 error = ENOTCONN;
904 break;
905 }
906 /* Lockless read. */
907 if (unp2->unp_flags & UNP_WANTCRED)
908 control = unp_addsockcred(td, control);
909 UNP_PCB_LOCK(unp);
910 if (unp->unp_addr != NULL)
911 from = (struct sockaddr *)unp->unp_addr;
912 else
913 from = &sun_noname;
914 so2 = unp2->unp_socket;
915 SOCKBUF_LOCK(&so2->so_rcv);
916 if (sbappendaddr_locked(&so2->so_rcv, from, m,
917 control)) {
918 sorwakeup_locked(so2);
919 m = NULL;
920 control = NULL;
921 } else {
922 SOCKBUF_UNLOCK(&so2->so_rcv);
923 error = ENOBUFS;
924 }
925 if (nam != NULL) {
926 UNP_LINK_WLOCK_ASSERT();
927 UNP_PCB_LOCK(unp2);
928 unp_disconnect(unp, unp2);
929 UNP_PCB_UNLOCK(unp2);
930 }
931 UNP_PCB_UNLOCK(unp);
932 break;
933 }
934
935 case SOCK_SEQPACKET:
936 case SOCK_STREAM:
937 if ((so->so_state & SS_ISCONNECTED) == 0) {
938 if (nam != NULL) {
939 UNP_LINK_WLOCK_ASSERT();
940 error = unp_connect(so, nam, td);
941 if (error)
942 break; /* XXX */
943 } else {
944 error = ENOTCONN;
945 break;
946 }
947 }
948
949 /* Lockless read. */
950 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
951 error = EPIPE;
952 break;
953 }
954
955 /*
956 * Because connect() and send() are non-atomic in a sendto()
957 * with a target address, it's possible that the socket will
958 * have disconnected before the send() can run. In that case
959 * return the slightly counter-intuitive but otherwise
960 * correct error that the socket is not connected.
961 *
962 * Locking here must be done carefully: the linkage lock
963 * prevents interconnections between unpcbs from changing, so
964 * we can traverse from unp to unp2 without acquiring unp's
965 * lock. Socket buffer locks follow unpcb locks, so we can
966 * acquire both remote and lock socket buffer locks.
967 */
968 unp2 = unp->unp_conn;
969 if (unp2 == NULL) {
970 error = ENOTCONN;
971 break;
972 }
973 so2 = unp2->unp_socket;
974 UNP_PCB_LOCK(unp2);
975 SOCKBUF_LOCK(&so2->so_rcv);
976 if (unp2->unp_flags & UNP_WANTCRED) {
977 /*
978 * Credentials are passed only once on SOCK_STREAM
979 * and SOCK_SEQPACKET.
980 */
981 unp2->unp_flags &= ~UNP_WANTCRED;
982 control = unp_addsockcred(td, control);
983 }
984
985 /*
986 * Send to paired receive port and wake up readers. Don't
987 * check for space available in the receive buffer if we're
988 * attaching ancillary data; Unix domain sockets only check
989 * for space in the sending sockbuf, and that check is
990 * performed one level up the stack. At that level we cannot
991 * precisely account for the amount of buffer space used
992 * (e.g., because control messages are not yet internalized).
993 */
994 switch (so->so_type) {
995 case SOCK_STREAM:
996 if (control != NULL) {
997 sbappendcontrol_locked(&so2->so_rcv, m,
998 control);
999 control = NULL;
1000 } else
1001 sbappend_locked(&so2->so_rcv, m, flags);
1002 break;
1003
1004 case SOCK_SEQPACKET: {
1005 const struct sockaddr *from;
1006
1007 from = &sun_noname;
1008 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
1009 from, m, control))
1010 control = NULL;
1011 break;
1012 }
1013 }
1014
1015 mbcnt = so2->so_rcv.sb_mbcnt;
1016 sbcc = sbavail(&so2->so_rcv);
1017 if (sbcc)
1018 sorwakeup_locked(so2);
1019 else
1020 SOCKBUF_UNLOCK(&so2->so_rcv);
1021
1022 /*
1023 * The PCB lock on unp2 protects the SB_STOP flag. Without it,
1024 * it would be possible for uipc_rcvd to be called at this
1025 * point, drain the receiving sockbuf, clear SB_STOP, and then
1026 * we would set SB_STOP below. That could lead to an empty
1027 * sockbuf having SB_STOP set
1028 */
1029 SOCKBUF_LOCK(&so->so_snd);
1030 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1031 so->so_snd.sb_flags |= SB_STOP;
1032 SOCKBUF_UNLOCK(&so->so_snd);
1033 UNP_PCB_UNLOCK(unp2);
1034 m = NULL;
1035 break;
1036 }
1037
1038 /*
1039 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1040 */
1041 if (flags & PRUS_EOF) {
1042 UNP_PCB_LOCK(unp);
1043 socantsendmore(so);
1044 unp_shutdown(unp);
1045 UNP_PCB_UNLOCK(unp);
1046 }
1047
1048 if ((nam != NULL) || (flags & PRUS_EOF))
1049 UNP_LINK_WUNLOCK();
1050 else
1051 UNP_LINK_RUNLOCK();
1052
1053 if (control != NULL && error != 0)
1054 unp_dispose(control);
1055
1056 release:
1057 if (control != NULL)
1058 m_freem(control);
1059 /*
1060 * In case of PRUS_NOTREADY, uipc_ready() is responsible
1061 * for freeing memory.
1062 */
1063 if (m != NULL && (flags & PRUS_NOTREADY) == 0)
1064 m_freem(m);
1065 return (error);
1066 }
1067
1068 static int
1069 uipc_ready(struct socket *so, struct mbuf *m, int count)
1070 {
1071 struct unpcb *unp, *unp2;
1072 struct socket *so2;
1073 int error;
1074
1075 unp = sotounpcb(so);
1076
1077 UNP_LINK_RLOCK();
1078 if ((unp2 = unp->unp_conn) == NULL) {
1079 UNP_LINK_RUNLOCK();
1080 for (int i = 0; i < count; i++)
1081 m = m_free(m);
1082 return (ECONNRESET);
1083 }
1084 UNP_PCB_LOCK(unp2);
1085 so2 = unp2->unp_socket;
1086
1087 SOCKBUF_LOCK(&so2->so_rcv);
1088 if ((error = sbready(&so2->so_rcv, m, count)) == 0)
1089 sorwakeup_locked(so2);
1090 else
1091 SOCKBUF_UNLOCK(&so2->so_rcv);
1092
1093 UNP_PCB_UNLOCK(unp2);
1094 UNP_LINK_RUNLOCK();
1095
1096 return (error);
1097 }
1098
1099 static int
1100 uipc_sense(struct socket *so, struct stat *sb)
1101 {
1102 struct unpcb *unp;
1103
1104 unp = sotounpcb(so);
1105 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1106
1107 sb->st_blksize = so->so_snd.sb_hiwat;
1108 UNP_PCB_LOCK(unp);
1109 sb->st_dev = NODEV;
1110 if (unp->unp_ino == 0)
1111 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1112 sb->st_ino = unp->unp_ino;
1113 UNP_PCB_UNLOCK(unp);
1114 return (0);
1115 }
1116
1117 static int
1118 uipc_shutdown(struct socket *so)
1119 {
1120 struct unpcb *unp;
1121
1122 unp = sotounpcb(so);
1123 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1124
1125 UNP_LINK_WLOCK();
1126 UNP_PCB_LOCK(unp);
1127 socantsendmore(so);
1128 unp_shutdown(unp);
1129 UNP_PCB_UNLOCK(unp);
1130 UNP_LINK_WUNLOCK();
1131 return (0);
1132 }
1133
1134 static int
1135 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1136 {
1137 struct unpcb *unp;
1138 const struct sockaddr *sa;
1139
1140 unp = sotounpcb(so);
1141 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1142
1143 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1144 UNP_PCB_LOCK(unp);
1145 if (unp->unp_addr != NULL)
1146 sa = (struct sockaddr *) unp->unp_addr;
1147 else
1148 sa = &sun_noname;
1149 bcopy(sa, *nam, sa->sa_len);
1150 UNP_PCB_UNLOCK(unp);
1151 return (0);
1152 }
1153
1154 static struct pr_usrreqs uipc_usrreqs_dgram = {
1155 .pru_abort = uipc_abort,
1156 .pru_accept = uipc_accept,
1157 .pru_attach = uipc_attach,
1158 .pru_bind = uipc_bind,
1159 .pru_bindat = uipc_bindat,
1160 .pru_connect = uipc_connect,
1161 .pru_connectat = uipc_connectat,
1162 .pru_connect2 = uipc_connect2,
1163 .pru_detach = uipc_detach,
1164 .pru_disconnect = uipc_disconnect,
1165 .pru_listen = uipc_listen,
1166 .pru_peeraddr = uipc_peeraddr,
1167 .pru_rcvd = uipc_rcvd,
1168 .pru_send = uipc_send,
1169 .pru_sense = uipc_sense,
1170 .pru_shutdown = uipc_shutdown,
1171 .pru_sockaddr = uipc_sockaddr,
1172 .pru_soreceive = soreceive_dgram,
1173 .pru_close = uipc_close,
1174 };
1175
1176 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1177 .pru_abort = uipc_abort,
1178 .pru_accept = uipc_accept,
1179 .pru_attach = uipc_attach,
1180 .pru_bind = uipc_bind,
1181 .pru_bindat = uipc_bindat,
1182 .pru_connect = uipc_connect,
1183 .pru_connectat = uipc_connectat,
1184 .pru_connect2 = uipc_connect2,
1185 .pru_detach = uipc_detach,
1186 .pru_disconnect = uipc_disconnect,
1187 .pru_listen = uipc_listen,
1188 .pru_peeraddr = uipc_peeraddr,
1189 .pru_rcvd = uipc_rcvd,
1190 .pru_send = uipc_send,
1191 .pru_sense = uipc_sense,
1192 .pru_shutdown = uipc_shutdown,
1193 .pru_sockaddr = uipc_sockaddr,
1194 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1195 .pru_close = uipc_close,
1196 };
1197
1198 static struct pr_usrreqs uipc_usrreqs_stream = {
1199 .pru_abort = uipc_abort,
1200 .pru_accept = uipc_accept,
1201 .pru_attach = uipc_attach,
1202 .pru_bind = uipc_bind,
1203 .pru_bindat = uipc_bindat,
1204 .pru_connect = uipc_connect,
1205 .pru_connectat = uipc_connectat,
1206 .pru_connect2 = uipc_connect2,
1207 .pru_detach = uipc_detach,
1208 .pru_disconnect = uipc_disconnect,
1209 .pru_listen = uipc_listen,
1210 .pru_peeraddr = uipc_peeraddr,
1211 .pru_rcvd = uipc_rcvd,
1212 .pru_send = uipc_send,
1213 .pru_ready = uipc_ready,
1214 .pru_sense = uipc_sense,
1215 .pru_shutdown = uipc_shutdown,
1216 .pru_sockaddr = uipc_sockaddr,
1217 .pru_soreceive = soreceive_generic,
1218 .pru_close = uipc_close,
1219 };
1220
1221 static int
1222 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1223 {
1224 struct unpcb *unp;
1225 struct xucred xu;
1226 int error, optval;
1227
1228 if (sopt->sopt_level != 0)
1229 return (EINVAL);
1230
1231 unp = sotounpcb(so);
1232 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1233 error = 0;
1234 switch (sopt->sopt_dir) {
1235 case SOPT_GET:
1236 switch (sopt->sopt_name) {
1237 case LOCAL_PEERCRED:
1238 UNP_PCB_LOCK(unp);
1239 if (unp->unp_flags & UNP_HAVEPC)
1240 xu = unp->unp_peercred;
1241 else {
1242 if (so->so_type == SOCK_STREAM)
1243 error = ENOTCONN;
1244 else
1245 error = EINVAL;
1246 }
1247 UNP_PCB_UNLOCK(unp);
1248 if (error == 0)
1249 error = sooptcopyout(sopt, &xu, sizeof(xu));
1250 break;
1251
1252 case LOCAL_CREDS:
1253 /* Unlocked read. */
1254 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1255 error = sooptcopyout(sopt, &optval, sizeof(optval));
1256 break;
1257
1258 case LOCAL_CONNWAIT:
1259 /* Unlocked read. */
1260 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1261 error = sooptcopyout(sopt, &optval, sizeof(optval));
1262 break;
1263
1264 default:
1265 error = EOPNOTSUPP;
1266 break;
1267 }
1268 break;
1269
1270 case SOPT_SET:
1271 switch (sopt->sopt_name) {
1272 case LOCAL_CREDS:
1273 case LOCAL_CONNWAIT:
1274 error = sooptcopyin(sopt, &optval, sizeof(optval),
1275 sizeof(optval));
1276 if (error)
1277 break;
1278
1279 #define OPTSET(bit) do { \
1280 UNP_PCB_LOCK(unp); \
1281 if (optval) \
1282 unp->unp_flags |= bit; \
1283 else \
1284 unp->unp_flags &= ~bit; \
1285 UNP_PCB_UNLOCK(unp); \
1286 } while (0)
1287
1288 switch (sopt->sopt_name) {
1289 case LOCAL_CREDS:
1290 OPTSET(UNP_WANTCRED);
1291 break;
1292
1293 case LOCAL_CONNWAIT:
1294 OPTSET(UNP_CONNWAIT);
1295 break;
1296
1297 default:
1298 break;
1299 }
1300 break;
1301 #undef OPTSET
1302 default:
1303 error = ENOPROTOOPT;
1304 break;
1305 }
1306 break;
1307
1308 default:
1309 error = EOPNOTSUPP;
1310 break;
1311 }
1312 return (error);
1313 }
1314
1315 static int
1316 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1317 {
1318
1319 return (unp_connectat(AT_FDCWD, so, nam, td));
1320 }
1321
1322 static int
1323 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1324 struct thread *td)
1325 {
1326 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1327 struct vnode *vp;
1328 struct socket *so2, *so3;
1329 struct unpcb *unp, *unp2, *unp3;
1330 struct nameidata nd;
1331 char buf[SOCK_MAXADDRLEN];
1332 struct sockaddr *sa;
1333 cap_rights_t rights;
1334 int error, len;
1335
1336 if (nam->sa_family != AF_UNIX)
1337 return (EAFNOSUPPORT);
1338
1339 UNP_LINK_WLOCK_ASSERT();
1340
1341 unp = sotounpcb(so);
1342 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1343
1344 if (nam->sa_len > sizeof(struct sockaddr_un))
1345 return (EINVAL);
1346 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1347 if (len <= 0)
1348 return (EINVAL);
1349 bcopy(soun->sun_path, buf, len);
1350 buf[len] = 0;
1351
1352 UNP_PCB_LOCK(unp);
1353 if (unp->unp_flags & UNP_CONNECTING) {
1354 UNP_PCB_UNLOCK(unp);
1355 return (EALREADY);
1356 }
1357 UNP_LINK_WUNLOCK();
1358 unp->unp_flags |= UNP_CONNECTING;
1359 UNP_PCB_UNLOCK(unp);
1360
1361 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1362 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1363 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1364 error = namei(&nd);
1365 if (error)
1366 vp = NULL;
1367 else
1368 vp = nd.ni_vp;
1369 ASSERT_VOP_LOCKED(vp, "unp_connect");
1370 NDFREE(&nd, NDF_ONLY_PNBUF);
1371 if (error)
1372 goto bad;
1373
1374 if (vp->v_type != VSOCK) {
1375 error = ENOTSOCK;
1376 goto bad;
1377 }
1378 #ifdef MAC
1379 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1380 if (error)
1381 goto bad;
1382 #endif
1383 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1384 if (error)
1385 goto bad;
1386
1387 unp = sotounpcb(so);
1388 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1389
1390 /*
1391 * Lock linkage lock for two reasons: make sure v_socket is stable,
1392 * and to protect simultaneous locking of multiple pcbs.
1393 */
1394 UNP_LINK_WLOCK();
1395 VOP_UNP_CONNECT(vp, &so2);
1396 if (so2 == NULL) {
1397 error = ECONNREFUSED;
1398 goto bad2;
1399 }
1400 if (so->so_type != so2->so_type) {
1401 error = EPROTOTYPE;
1402 goto bad2;
1403 }
1404 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1405 if (so2->so_options & SO_ACCEPTCONN) {
1406 CURVNET_SET(so2->so_vnet);
1407 so3 = sonewconn(so2, 0);
1408 CURVNET_RESTORE();
1409 } else
1410 so3 = NULL;
1411 if (so3 == NULL) {
1412 error = ECONNREFUSED;
1413 goto bad2;
1414 }
1415 unp = sotounpcb(so);
1416 unp2 = sotounpcb(so2);
1417 unp3 = sotounpcb(so3);
1418 UNP_PCB_LOCK(unp);
1419 UNP_PCB_LOCK(unp2);
1420 UNP_PCB_LOCK(unp3);
1421 if (unp2->unp_addr != NULL) {
1422 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1423 unp3->unp_addr = (struct sockaddr_un *) sa;
1424 sa = NULL;
1425 }
1426
1427 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1428 ("unp_connect: listener without cached peercred"));
1429 unp_copy_peercred(td, unp3, unp, unp2);
1430
1431 UNP_PCB_UNLOCK(unp3);
1432 UNP_PCB_UNLOCK(unp2);
1433 UNP_PCB_UNLOCK(unp);
1434 #ifdef MAC
1435 mac_socketpeer_set_from_socket(so, so3);
1436 mac_socketpeer_set_from_socket(so3, so);
1437 #endif
1438
1439 so2 = so3;
1440 }
1441 unp = sotounpcb(so);
1442 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1443 unp2 = sotounpcb(so2);
1444 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1445 UNP_PCB_LOCK(unp);
1446 UNP_PCB_LOCK(unp2);
1447 error = unp_connect2(so, so2, PRU_CONNECT);
1448 UNP_PCB_UNLOCK(unp2);
1449 UNP_PCB_UNLOCK(unp);
1450 bad2:
1451 UNP_LINK_WUNLOCK();
1452 bad:
1453 if (vp != NULL)
1454 vput(vp);
1455 free(sa, M_SONAME);
1456 UNP_LINK_WLOCK();
1457 UNP_PCB_LOCK(unp);
1458 unp->unp_flags &= ~UNP_CONNECTING;
1459 UNP_PCB_UNLOCK(unp);
1460 return (error);
1461 }
1462
1463 /*
1464 * Set socket peer credentials at connection time.
1465 *
1466 * The client's PCB credentials are copied from its process structure. The
1467 * server's PCB credentials are copied from the socket on which it called
1468 * listen(2). uipc_listen cached that process's credentials at the time.
1469 */
1470 void
1471 unp_copy_peercred(struct thread *td, struct unpcb *client_unp,
1472 struct unpcb *server_unp, struct unpcb *listen_unp)
1473 {
1474 cru2x(td->td_ucred, &client_unp->unp_peercred);
1475 client_unp->unp_flags |= UNP_HAVEPC;
1476
1477 memcpy(&server_unp->unp_peercred, &listen_unp->unp_peercred,
1478 sizeof(server_unp->unp_peercred));
1479 server_unp->unp_flags |= UNP_HAVEPC;
1480 if (listen_unp->unp_flags & UNP_WANTCRED)
1481 client_unp->unp_flags |= UNP_WANTCRED;
1482 }
1483
1484 static int
1485 unp_connect2(struct socket *so, struct socket *so2, int req)
1486 {
1487 struct unpcb *unp;
1488 struct unpcb *unp2;
1489
1490 unp = sotounpcb(so);
1491 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1492 unp2 = sotounpcb(so2);
1493 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1494
1495 UNP_LINK_WLOCK_ASSERT();
1496 UNP_PCB_LOCK_ASSERT(unp);
1497 UNP_PCB_LOCK_ASSERT(unp2);
1498
1499 if (so2->so_type != so->so_type)
1500 return (EPROTOTYPE);
1501 unp2->unp_flags &= ~UNP_NASCENT;
1502 unp->unp_conn = unp2;
1503
1504 switch (so->so_type) {
1505 case SOCK_DGRAM:
1506 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1507 soisconnected(so);
1508 break;
1509
1510 case SOCK_STREAM:
1511 case SOCK_SEQPACKET:
1512 unp2->unp_conn = unp;
1513 if (req == PRU_CONNECT &&
1514 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1515 soisconnecting(so);
1516 else
1517 soisconnected(so);
1518 soisconnected(so2);
1519 break;
1520
1521 default:
1522 panic("unp_connect2");
1523 }
1524 return (0);
1525 }
1526
1527 static void
1528 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1529 {
1530 struct socket *so;
1531
1532 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1533
1534 UNP_LINK_WLOCK_ASSERT();
1535 UNP_PCB_LOCK_ASSERT(unp);
1536 UNP_PCB_LOCK_ASSERT(unp2);
1537
1538 unp->unp_conn = NULL;
1539 switch (unp->unp_socket->so_type) {
1540 case SOCK_DGRAM:
1541 LIST_REMOVE(unp, unp_reflink);
1542 so = unp->unp_socket;
1543 SOCK_LOCK(so);
1544 so->so_state &= ~SS_ISCONNECTED;
1545 SOCK_UNLOCK(so);
1546 break;
1547
1548 case SOCK_STREAM:
1549 case SOCK_SEQPACKET:
1550 soisdisconnected(unp->unp_socket);
1551 unp2->unp_conn = NULL;
1552 soisdisconnected(unp2->unp_socket);
1553 break;
1554 }
1555 }
1556
1557 /*
1558 * unp_pcblist() walks the global list of struct unpcb's to generate a
1559 * pointer list, bumping the refcount on each unpcb. It then copies them out
1560 * sequentially, validating the generation number on each to see if it has
1561 * been detached. All of this is necessary because copyout() may sleep on
1562 * disk I/O.
1563 */
1564 static int
1565 unp_pcblist(SYSCTL_HANDLER_ARGS)
1566 {
1567 int error, i, n;
1568 int freeunp;
1569 struct unpcb *unp, **unp_list;
1570 unp_gen_t gencnt;
1571 struct xunpgen *xug;
1572 struct unp_head *head;
1573 struct xunpcb *xu;
1574
1575 switch ((intptr_t)arg1) {
1576 case SOCK_STREAM:
1577 head = &unp_shead;
1578 break;
1579
1580 case SOCK_DGRAM:
1581 head = &unp_dhead;
1582 break;
1583
1584 case SOCK_SEQPACKET:
1585 head = &unp_sphead;
1586 break;
1587
1588 default:
1589 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1590 }
1591
1592 /*
1593 * The process of preparing the PCB list is too time-consuming and
1594 * resource-intensive to repeat twice on every request.
1595 */
1596 if (req->oldptr == NULL) {
1597 n = unp_count;
1598 req->oldidx = 2 * (sizeof *xug)
1599 + (n + n/8) * sizeof(struct xunpcb);
1600 return (0);
1601 }
1602
1603 if (req->newptr != NULL)
1604 return (EPERM);
1605
1606 /*
1607 * OK, now we're committed to doing something.
1608 */
1609 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK | M_ZERO);
1610 UNP_LIST_LOCK();
1611 gencnt = unp_gencnt;
1612 n = unp_count;
1613 UNP_LIST_UNLOCK();
1614
1615 xug->xug_len = sizeof *xug;
1616 xug->xug_count = n;
1617 xug->xug_gen = gencnt;
1618 xug->xug_sogen = so_gencnt;
1619 error = SYSCTL_OUT(req, xug, sizeof *xug);
1620 if (error) {
1621 free(xug, M_TEMP);
1622 return (error);
1623 }
1624
1625 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1626
1627 UNP_LIST_LOCK();
1628 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1629 unp = LIST_NEXT(unp, unp_link)) {
1630 UNP_PCB_LOCK(unp);
1631 if (unp->unp_gencnt <= gencnt) {
1632 if (cr_cansee(req->td->td_ucred,
1633 unp->unp_socket->so_cred)) {
1634 UNP_PCB_UNLOCK(unp);
1635 continue;
1636 }
1637 unp_list[i++] = unp;
1638 unp->unp_refcount++;
1639 }
1640 UNP_PCB_UNLOCK(unp);
1641 }
1642 UNP_LIST_UNLOCK();
1643 n = i; /* In case we lost some during malloc. */
1644
1645 error = 0;
1646 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1647 for (i = 0; i < n; i++) {
1648 unp = unp_list[i];
1649 UNP_PCB_LOCK(unp);
1650 unp->unp_refcount--;
1651 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1652 xu->xu_len = sizeof *xu;
1653 xu->xu_unpp = unp;
1654 /*
1655 * XXX - need more locking here to protect against
1656 * connect/disconnect races for SMP.
1657 */
1658 if (unp->unp_addr != NULL)
1659 bcopy(unp->unp_addr, &xu->xu_addr,
1660 unp->unp_addr->sun_len);
1661 if (unp->unp_conn != NULL &&
1662 unp->unp_conn->unp_addr != NULL)
1663 bcopy(unp->unp_conn->unp_addr,
1664 &xu->xu_caddr,
1665 unp->unp_conn->unp_addr->sun_len);
1666 bcopy(unp, &xu->xu_unp, sizeof *unp);
1667 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1668 UNP_PCB_UNLOCK(unp);
1669 error = SYSCTL_OUT(req, xu, sizeof *xu);
1670 } else {
1671 freeunp = (unp->unp_refcount == 0);
1672 UNP_PCB_UNLOCK(unp);
1673 if (freeunp) {
1674 UNP_PCB_LOCK_DESTROY(unp);
1675 uma_zfree(unp_zone, unp);
1676 }
1677 }
1678 }
1679 free(xu, M_TEMP);
1680 if (!error) {
1681 /*
1682 * Give the user an updated idea of our state. If the
1683 * generation differs from what we told her before, she knows
1684 * that something happened while we were processing this
1685 * request, and it might be necessary to retry.
1686 */
1687 xug->xug_gen = unp_gencnt;
1688 xug->xug_sogen = so_gencnt;
1689 xug->xug_count = unp_count;
1690 error = SYSCTL_OUT(req, xug, sizeof *xug);
1691 }
1692 free(unp_list, M_TEMP);
1693 free(xug, M_TEMP);
1694 return (error);
1695 }
1696
1697 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1698 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1699 "List of active local datagram sockets");
1700 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1701 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1702 "List of active local stream sockets");
1703 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1704 CTLTYPE_OPAQUE | CTLFLAG_RD,
1705 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1706 "List of active local seqpacket sockets");
1707
1708 static void
1709 unp_shutdown(struct unpcb *unp)
1710 {
1711 struct unpcb *unp2;
1712 struct socket *so;
1713
1714 UNP_LINK_WLOCK_ASSERT();
1715 UNP_PCB_LOCK_ASSERT(unp);
1716
1717 unp2 = unp->unp_conn;
1718 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1719 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1720 so = unp2->unp_socket;
1721 if (so != NULL)
1722 socantrcvmore(so);
1723 }
1724 }
1725
1726 static void
1727 unp_drop(struct unpcb *unp)
1728 {
1729 struct socket *so = unp->unp_socket;
1730 struct unpcb *unp2;
1731
1732 UNP_LINK_WLOCK_ASSERT();
1733 UNP_PCB_LOCK_ASSERT(unp);
1734
1735 /*
1736 * Regardless of whether the socket's peer dropped the connection
1737 * with this socket by aborting or disconnecting, POSIX requires
1738 * that ECONNRESET is returned.
1739 */
1740 so->so_error = ECONNRESET;
1741 unp2 = unp->unp_conn;
1742 if (unp2 == NULL)
1743 return;
1744 UNP_PCB_LOCK(unp2);
1745 unp_disconnect(unp, unp2);
1746 UNP_PCB_UNLOCK(unp2);
1747 }
1748
1749 static void
1750 unp_freerights(struct filedescent **fdep, int fdcount)
1751 {
1752 struct file *fp;
1753 int i;
1754
1755 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1756
1757 for (i = 0; i < fdcount; i++) {
1758 fp = fdep[i]->fde_file;
1759 filecaps_free(&fdep[i]->fde_caps);
1760 unp_discard(fp);
1761 }
1762 free(fdep[0], M_FILECAPS);
1763 }
1764
1765 static int
1766 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1767 {
1768 struct thread *td = curthread; /* XXX */
1769 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1770 int i;
1771 int *fdp;
1772 struct filedesc *fdesc = td->td_proc->p_fd;
1773 struct filedescent **fdep;
1774 void *data;
1775 socklen_t clen = control->m_len, datalen;
1776 int error, newfds;
1777 u_int newlen;
1778
1779 UNP_LINK_UNLOCK_ASSERT();
1780
1781 error = 0;
1782 if (controlp != NULL) /* controlp == NULL => free control messages */
1783 *controlp = NULL;
1784 while (cm != NULL) {
1785 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1786 error = EINVAL;
1787 break;
1788 }
1789 data = CMSG_DATA(cm);
1790 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1791 if (cm->cmsg_level == SOL_SOCKET
1792 && cm->cmsg_type == SCM_RIGHTS) {
1793 newfds = datalen / sizeof(*fdep);
1794 if (newfds == 0)
1795 goto next;
1796 fdep = data;
1797
1798 /* If we're not outputting the descriptors free them. */
1799 if (error || controlp == NULL) {
1800 unp_freerights(fdep, newfds);
1801 goto next;
1802 }
1803 FILEDESC_XLOCK(fdesc);
1804
1805 /*
1806 * Now change each pointer to an fd in the global
1807 * table to an integer that is the index to the local
1808 * fd table entry that we set up to point to the
1809 * global one we are transferring.
1810 */
1811 newlen = newfds * sizeof(int);
1812 *controlp = sbcreatecontrol(NULL, newlen,
1813 SCM_RIGHTS, SOL_SOCKET);
1814 if (*controlp == NULL) {
1815 FILEDESC_XUNLOCK(fdesc);
1816 error = E2BIG;
1817 unp_freerights(fdep, newfds);
1818 goto next;
1819 }
1820
1821 fdp = (int *)
1822 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1823 if (fdallocn(td, 0, fdp, newfds) != 0) {
1824 FILEDESC_XUNLOCK(fdesc);
1825 error = EMSGSIZE;
1826 unp_freerights(fdep, newfds);
1827 m_freem(*controlp);
1828 *controlp = NULL;
1829 goto next;
1830 }
1831 for (i = 0; i < newfds; i++, fdp++) {
1832 _finstall(fdesc, fdep[i]->fde_file, *fdp,
1833 (flags & MSG_CMSG_CLOEXEC) != 0 ? UF_EXCLOSE : 0,
1834 &fdep[i]->fde_caps);
1835 unp_externalize_fp(fdep[i]->fde_file);
1836 }
1837
1838 /*
1839 * The new type indicates that the mbuf data refers to
1840 * kernel resources that may need to be released before
1841 * the mbuf is freed.
1842 */
1843 m_chtype(*controlp, MT_EXTCONTROL);
1844 FILEDESC_XUNLOCK(fdesc);
1845 free(fdep[0], M_FILECAPS);
1846 } else {
1847 /* We can just copy anything else across. */
1848 if (error || controlp == NULL)
1849 goto next;
1850 *controlp = sbcreatecontrol(NULL, datalen,
1851 cm->cmsg_type, cm->cmsg_level);
1852 if (*controlp == NULL) {
1853 error = ENOBUFS;
1854 goto next;
1855 }
1856 bcopy(data,
1857 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1858 datalen);
1859 }
1860 controlp = &(*controlp)->m_next;
1861
1862 next:
1863 if (CMSG_SPACE(datalen) < clen) {
1864 clen -= CMSG_SPACE(datalen);
1865 cm = (struct cmsghdr *)
1866 ((caddr_t)cm + CMSG_SPACE(datalen));
1867 } else {
1868 clen = 0;
1869 cm = NULL;
1870 }
1871 }
1872
1873 m_freem(control);
1874 return (error);
1875 }
1876
1877 static void
1878 unp_zone_change(void *tag)
1879 {
1880
1881 uma_zone_set_max(unp_zone, maxsockets);
1882 }
1883
1884 static void
1885 unp_init(void)
1886 {
1887
1888 #ifdef VIMAGE
1889 if (!IS_DEFAULT_VNET(curvnet))
1890 return;
1891 #endif
1892 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1893 NULL, NULL, UMA_ALIGN_PTR, 0);
1894 if (unp_zone == NULL)
1895 panic("unp_init");
1896 uma_zone_set_max(unp_zone, maxsockets);
1897 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1898 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1899 NULL, EVENTHANDLER_PRI_ANY);
1900 LIST_INIT(&unp_dhead);
1901 LIST_INIT(&unp_shead);
1902 LIST_INIT(&unp_sphead);
1903 SLIST_INIT(&unp_defers);
1904 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1905 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1906 UNP_LINK_LOCK_INIT();
1907 UNP_LIST_LOCK_INIT();
1908 UNP_DEFERRED_LOCK_INIT();
1909 }
1910
1911 static void
1912 unp_internalize_cleanup_rights(struct mbuf *control)
1913 {
1914 struct cmsghdr *cp;
1915 struct mbuf *m;
1916 void *data;
1917 socklen_t datalen;
1918
1919 for (m = control; m != NULL; m = m->m_next) {
1920 cp = mtod(m, struct cmsghdr *);
1921 if (cp->cmsg_level != SOL_SOCKET ||
1922 cp->cmsg_type != SCM_RIGHTS)
1923 continue;
1924 data = CMSG_DATA(cp);
1925 datalen = (caddr_t)cp + cp->cmsg_len - (caddr_t)data;
1926 unp_freerights(data, datalen / sizeof(struct filedesc *));
1927 }
1928 }
1929
1930 static int
1931 unp_internalize(struct mbuf **controlp, struct thread *td)
1932 {
1933 struct mbuf *control, **initial_controlp;
1934 struct proc *p;
1935 struct filedesc *fdesc;
1936 struct bintime *bt;
1937 struct cmsghdr *cm;
1938 struct cmsgcred *cmcred;
1939 struct filedescent *fde, **fdep, *fdev;
1940 struct file *fp;
1941 struct timeval *tv;
1942 struct timespec *ts;
1943 void *data;
1944 socklen_t clen, datalen;
1945 int i, error, *fdp, oldfds;
1946 u_int newlen;
1947
1948 UNP_LINK_UNLOCK_ASSERT();
1949
1950 p = td->td_proc;
1951 fdesc = p->p_fd;
1952 error = 0;
1953 control = *controlp;
1954 clen = control->m_len;
1955 *controlp = NULL;
1956 initial_controlp = controlp;
1957 for (cm = mtod(control, struct cmsghdr *); cm != NULL;) {
1958 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1959 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
1960 error = EINVAL;
1961 goto out;
1962 }
1963 data = CMSG_DATA(cm);
1964 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1965
1966 switch (cm->cmsg_type) {
1967 /*
1968 * Fill in credential information.
1969 */
1970 case SCM_CREDS:
1971 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1972 SCM_CREDS, SOL_SOCKET);
1973 if (*controlp == NULL) {
1974 error = ENOBUFS;
1975 goto out;
1976 }
1977 cmcred = (struct cmsgcred *)
1978 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1979 cmcred->cmcred_pid = p->p_pid;
1980 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1981 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1982 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1983 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1984 CMGROUP_MAX);
1985 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1986 cmcred->cmcred_groups[i] =
1987 td->td_ucred->cr_groups[i];
1988 break;
1989
1990 case SCM_RIGHTS:
1991 oldfds = datalen / sizeof (int);
1992 if (oldfds == 0)
1993 break;
1994 /*
1995 * Check that all the FDs passed in refer to legal
1996 * files. If not, reject the entire operation.
1997 */
1998 fdp = data;
1999 FILEDESC_SLOCK(fdesc);
2000 for (i = 0; i < oldfds; i++, fdp++) {
2001 fp = fget_locked(fdesc, *fdp);
2002 if (fp == NULL) {
2003 FILEDESC_SUNLOCK(fdesc);
2004 error = EBADF;
2005 goto out;
2006 }
2007 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
2008 FILEDESC_SUNLOCK(fdesc);
2009 error = EOPNOTSUPP;
2010 goto out;
2011 }
2012
2013 }
2014
2015 /*
2016 * Now replace the integer FDs with pointers to the
2017 * file structure and capability rights.
2018 */
2019 newlen = oldfds * sizeof(fdep[0]);
2020 *controlp = sbcreatecontrol(NULL, newlen,
2021 SCM_RIGHTS, SOL_SOCKET);
2022 if (*controlp == NULL) {
2023 FILEDESC_SUNLOCK(fdesc);
2024 error = E2BIG;
2025 goto out;
2026 }
2027 fdp = data;
2028 fdep = (struct filedescent **)
2029 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2030 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
2031 M_WAITOK);
2032 for (i = 0; i < oldfds; i++, fdev++, fdp++) {
2033 fde = &fdesc->fd_ofiles[*fdp];
2034 fdep[i] = fdev;
2035 fdep[i]->fde_file = fde->fde_file;
2036 filecaps_copy(&fde->fde_caps,
2037 &fdep[i]->fde_caps, true);
2038 unp_internalize_fp(fdep[i]->fde_file);
2039 }
2040 FILEDESC_SUNLOCK(fdesc);
2041 break;
2042
2043 case SCM_TIMESTAMP:
2044 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
2045 SCM_TIMESTAMP, SOL_SOCKET);
2046 if (*controlp == NULL) {
2047 error = ENOBUFS;
2048 goto out;
2049 }
2050 tv = (struct timeval *)
2051 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2052 microtime(tv);
2053 break;
2054
2055 case SCM_BINTIME:
2056 *controlp = sbcreatecontrol(NULL, sizeof(*bt),
2057 SCM_BINTIME, SOL_SOCKET);
2058 if (*controlp == NULL) {
2059 error = ENOBUFS;
2060 goto out;
2061 }
2062 bt = (struct bintime *)
2063 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2064 bintime(bt);
2065 break;
2066
2067 case SCM_REALTIME:
2068 *controlp = sbcreatecontrol(NULL, sizeof(*ts),
2069 SCM_REALTIME, SOL_SOCKET);
2070 if (*controlp == NULL) {
2071 error = ENOBUFS;
2072 goto out;
2073 }
2074 ts = (struct timespec *)
2075 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2076 nanotime(ts);
2077 break;
2078
2079 case SCM_MONOTONIC:
2080 *controlp = sbcreatecontrol(NULL, sizeof(*ts),
2081 SCM_MONOTONIC, SOL_SOCKET);
2082 if (*controlp == NULL) {
2083 error = ENOBUFS;
2084 goto out;
2085 }
2086 ts = (struct timespec *)
2087 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
2088 nanouptime(ts);
2089 break;
2090
2091 default:
2092 error = EINVAL;
2093 goto out;
2094 }
2095
2096 controlp = &(*controlp)->m_next;
2097 if (CMSG_SPACE(datalen) < clen) {
2098 clen -= CMSG_SPACE(datalen);
2099 cm = (struct cmsghdr *)
2100 ((caddr_t)cm + CMSG_SPACE(datalen));
2101 } else {
2102 clen = 0;
2103 cm = NULL;
2104 }
2105 }
2106
2107 out:
2108 if (error != 0 && initial_controlp != NULL)
2109 unp_internalize_cleanup_rights(*initial_controlp);
2110 m_freem(control);
2111 return (error);
2112 }
2113
2114 static struct mbuf *
2115 unp_addsockcred(struct thread *td, struct mbuf *control)
2116 {
2117 struct mbuf *m, *n, *n_prev;
2118 struct sockcred *sc;
2119 const struct cmsghdr *cm;
2120 int ngroups;
2121 int i;
2122
2123 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2124 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2125 if (m == NULL)
2126 return (control);
2127
2128 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2129 sc->sc_uid = td->td_ucred->cr_ruid;
2130 sc->sc_euid = td->td_ucred->cr_uid;
2131 sc->sc_gid = td->td_ucred->cr_rgid;
2132 sc->sc_egid = td->td_ucred->cr_gid;
2133 sc->sc_ngroups = ngroups;
2134 for (i = 0; i < sc->sc_ngroups; i++)
2135 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2136
2137 /*
2138 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2139 * created SCM_CREDS control message (struct sockcred) has another
2140 * format.
2141 */
2142 if (control != NULL)
2143 for (n = control, n_prev = NULL; n != NULL;) {
2144 cm = mtod(n, struct cmsghdr *);
2145 if (cm->cmsg_level == SOL_SOCKET &&
2146 cm->cmsg_type == SCM_CREDS) {
2147 if (n_prev == NULL)
2148 control = n->m_next;
2149 else
2150 n_prev->m_next = n->m_next;
2151 n = m_free(n);
2152 } else {
2153 n_prev = n;
2154 n = n->m_next;
2155 }
2156 }
2157
2158 /* Prepend it to the head. */
2159 m->m_next = control;
2160 return (m);
2161 }
2162
2163 static struct unpcb *
2164 fptounp(struct file *fp)
2165 {
2166 struct socket *so;
2167
2168 if (fp->f_type != DTYPE_SOCKET)
2169 return (NULL);
2170 if ((so = fp->f_data) == NULL)
2171 return (NULL);
2172 if (so->so_proto->pr_domain != &localdomain)
2173 return (NULL);
2174 return sotounpcb(so);
2175 }
2176
2177 static void
2178 unp_discard(struct file *fp)
2179 {
2180 struct unp_defer *dr;
2181
2182 if (unp_externalize_fp(fp)) {
2183 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2184 dr->ud_fp = fp;
2185 UNP_DEFERRED_LOCK();
2186 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2187 UNP_DEFERRED_UNLOCK();
2188 atomic_add_int(&unp_defers_count, 1);
2189 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2190 } else
2191 (void) closef(fp, (struct thread *)NULL);
2192 }
2193
2194 static void
2195 unp_process_defers(void *arg __unused, int pending)
2196 {
2197 struct unp_defer *dr;
2198 SLIST_HEAD(, unp_defer) drl;
2199 int count;
2200
2201 SLIST_INIT(&drl);
2202 for (;;) {
2203 UNP_DEFERRED_LOCK();
2204 if (SLIST_FIRST(&unp_defers) == NULL) {
2205 UNP_DEFERRED_UNLOCK();
2206 break;
2207 }
2208 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2209 UNP_DEFERRED_UNLOCK();
2210 count = 0;
2211 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2212 SLIST_REMOVE_HEAD(&drl, ud_link);
2213 closef(dr->ud_fp, NULL);
2214 free(dr, M_TEMP);
2215 count++;
2216 }
2217 atomic_add_int(&unp_defers_count, -count);
2218 }
2219 }
2220
2221 static void
2222 unp_internalize_fp(struct file *fp)
2223 {
2224 struct unpcb *unp;
2225
2226 UNP_LINK_WLOCK();
2227 if ((unp = fptounp(fp)) != NULL) {
2228 unp->unp_file = fp;
2229 unp->unp_msgcount++;
2230 }
2231 fhold(fp);
2232 unp_rights++;
2233 UNP_LINK_WUNLOCK();
2234 }
2235
2236 static int
2237 unp_externalize_fp(struct file *fp)
2238 {
2239 struct unpcb *unp;
2240 int ret;
2241
2242 UNP_LINK_WLOCK();
2243 if ((unp = fptounp(fp)) != NULL) {
2244 unp->unp_msgcount--;
2245 ret = 1;
2246 } else
2247 ret = 0;
2248 unp_rights--;
2249 UNP_LINK_WUNLOCK();
2250 return (ret);
2251 }
2252
2253 /*
2254 * unp_defer indicates whether additional work has been defered for a future
2255 * pass through unp_gc(). It is thread local and does not require explicit
2256 * synchronization.
2257 */
2258 static int unp_marked;
2259 static int unp_unreachable;
2260
2261 static void
2262 unp_accessable(struct filedescent **fdep, int fdcount)
2263 {
2264 struct unpcb *unp;
2265 struct file *fp;
2266 int i;
2267
2268 for (i = 0; i < fdcount; i++) {
2269 fp = fdep[i]->fde_file;
2270 if ((unp = fptounp(fp)) == NULL)
2271 continue;
2272 if (unp->unp_gcflag & UNPGC_REF)
2273 continue;
2274 unp->unp_gcflag &= ~UNPGC_DEAD;
2275 unp->unp_gcflag |= UNPGC_REF;
2276 unp_marked++;
2277 }
2278 }
2279
2280 static void
2281 unp_gc_process(struct unpcb *unp)
2282 {
2283 struct socket *soa;
2284 struct socket *so;
2285 struct file *fp;
2286
2287 /* Already processed. */
2288 if (unp->unp_gcflag & UNPGC_SCANNED)
2289 return;
2290 fp = unp->unp_file;
2291
2292 /*
2293 * Check for a socket potentially in a cycle. It must be in a
2294 * queue as indicated by msgcount, and this must equal the file
2295 * reference count. Note that when msgcount is 0 the file is NULL.
2296 */
2297 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2298 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2299 unp->unp_gcflag |= UNPGC_DEAD;
2300 unp_unreachable++;
2301 return;
2302 }
2303
2304 /*
2305 * Mark all sockets we reference with RIGHTS.
2306 */
2307 so = unp->unp_socket;
2308 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) {
2309 SOCKBUF_LOCK(&so->so_rcv);
2310 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2311 SOCKBUF_UNLOCK(&so->so_rcv);
2312 }
2313
2314 /*
2315 * Mark all sockets in our accept queue.
2316 */
2317 ACCEPT_LOCK();
2318 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2319 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0)
2320 continue;
2321 SOCKBUF_LOCK(&soa->so_rcv);
2322 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2323 SOCKBUF_UNLOCK(&soa->so_rcv);
2324 }
2325 ACCEPT_UNLOCK();
2326 unp->unp_gcflag |= UNPGC_SCANNED;
2327 }
2328
2329 static int unp_recycled;
2330 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2331 "Number of unreachable sockets claimed by the garbage collector.");
2332
2333 static int unp_taskcount;
2334 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2335 "Number of times the garbage collector has run.");
2336
2337 static void
2338 unp_gc(__unused void *arg, int pending)
2339 {
2340 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2341 NULL };
2342 struct unp_head **head;
2343 struct file *f, **unref;
2344 struct unpcb *unp;
2345 int i, total;
2346
2347 unp_taskcount++;
2348 UNP_LIST_LOCK();
2349 /*
2350 * First clear all gc flags from previous runs, apart from
2351 * UNPGC_IGNORE_RIGHTS.
2352 */
2353 for (head = heads; *head != NULL; head++)
2354 LIST_FOREACH(unp, *head, unp_link)
2355 unp->unp_gcflag =
2356 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS);
2357
2358 /*
2359 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2360 * is reachable all of the sockets it references are reachable.
2361 * Stop the scan once we do a complete loop without discovering
2362 * a new reachable socket.
2363 */
2364 do {
2365 unp_unreachable = 0;
2366 unp_marked = 0;
2367 for (head = heads; *head != NULL; head++)
2368 LIST_FOREACH(unp, *head, unp_link)
2369 unp_gc_process(unp);
2370 } while (unp_marked);
2371 UNP_LIST_UNLOCK();
2372 if (unp_unreachable == 0)
2373 return;
2374
2375 /*
2376 * Allocate space for a local list of dead unpcbs.
2377 */
2378 unref = malloc(unp_unreachable * sizeof(struct file *),
2379 M_TEMP, M_WAITOK);
2380
2381 /*
2382 * Iterate looking for sockets which have been specifically marked
2383 * as as unreachable and store them locally.
2384 */
2385 UNP_LINK_RLOCK();
2386 UNP_LIST_LOCK();
2387 for (total = 0, head = heads; *head != NULL; head++)
2388 LIST_FOREACH(unp, *head, unp_link)
2389 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2390 f = unp->unp_file;
2391 if (unp->unp_msgcount == 0 || f == NULL ||
2392 f->f_count != unp->unp_msgcount)
2393 continue;
2394 unref[total++] = f;
2395 fhold(f);
2396 KASSERT(total <= unp_unreachable,
2397 ("unp_gc: incorrect unreachable count."));
2398 }
2399 UNP_LIST_UNLOCK();
2400 UNP_LINK_RUNLOCK();
2401
2402 /*
2403 * Now flush all sockets, free'ing rights. This will free the
2404 * struct files associated with these sockets but leave each socket
2405 * with one remaining ref.
2406 */
2407 for (i = 0; i < total; i++) {
2408 struct socket *so;
2409
2410 so = unref[i]->f_data;
2411 CURVNET_SET(so->so_vnet);
2412 sorflush(so);
2413 CURVNET_RESTORE();
2414 }
2415
2416 /*
2417 * And finally release the sockets so they can be reclaimed.
2418 */
2419 for (i = 0; i < total; i++)
2420 fdrop(unref[i], NULL);
2421 unp_recycled += total;
2422 free(unref, M_TEMP);
2423 }
2424
2425 static void
2426 unp_dispose(struct mbuf *m)
2427 {
2428
2429 if (m)
2430 unp_scan(m, unp_freerights);
2431 }
2432
2433 /*
2434 * Synchronize against unp_gc, which can trip over data as we are freeing it.
2435 */
2436 static void
2437 unp_dispose_so(struct socket *so)
2438 {
2439 struct unpcb *unp;
2440
2441 unp = sotounpcb(so);
2442 UNP_LIST_LOCK();
2443 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
2444 UNP_LIST_UNLOCK();
2445 unp_dispose(so->so_rcv.sb_mb);
2446 }
2447
2448 static void
2449 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2450 {
2451 struct mbuf *m;
2452 struct cmsghdr *cm;
2453 void *data;
2454 socklen_t clen, datalen;
2455
2456 while (m0 != NULL) {
2457 for (m = m0; m; m = m->m_next) {
2458 if (m->m_type != MT_CONTROL)
2459 continue;
2460
2461 cm = mtod(m, struct cmsghdr *);
2462 clen = m->m_len;
2463
2464 while (cm != NULL) {
2465 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2466 break;
2467
2468 data = CMSG_DATA(cm);
2469 datalen = (caddr_t)cm + cm->cmsg_len
2470 - (caddr_t)data;
2471
2472 if (cm->cmsg_level == SOL_SOCKET &&
2473 cm->cmsg_type == SCM_RIGHTS) {
2474 (*op)(data, datalen /
2475 sizeof(struct filedescent *));
2476 }
2477
2478 if (CMSG_SPACE(datalen) < clen) {
2479 clen -= CMSG_SPACE(datalen);
2480 cm = (struct cmsghdr *)
2481 ((caddr_t)cm + CMSG_SPACE(datalen));
2482 } else {
2483 clen = 0;
2484 cm = NULL;
2485 }
2486 }
2487 }
2488 m0 = m0->m_nextpkt;
2489 }
2490 }
2491
2492 /*
2493 * A helper function called by VFS before socket-type vnode reclamation.
2494 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2495 * use count.
2496 */
2497 void
2498 vfs_unp_reclaim(struct vnode *vp)
2499 {
2500 struct socket *so;
2501 struct unpcb *unp;
2502 int active;
2503
2504 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2505 KASSERT(vp->v_type == VSOCK,
2506 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2507
2508 active = 0;
2509 UNP_LINK_WLOCK();
2510 VOP_UNP_CONNECT(vp, &so);
2511 if (so == NULL)
2512 goto done;
2513 unp = sotounpcb(so);
2514 if (unp == NULL)
2515 goto done;
2516 UNP_PCB_LOCK(unp);
2517 if (unp->unp_vnode == vp) {
2518 VOP_UNP_DETACH(vp);
2519 unp->unp_vnode = NULL;
2520 active = 1;
2521 }
2522 UNP_PCB_UNLOCK(unp);
2523 done:
2524 UNP_LINK_WUNLOCK();
2525 if (active)
2526 vunref(vp);
2527 }
2528
2529 #ifdef DDB
2530 static void
2531 db_print_indent(int indent)
2532 {
2533 int i;
2534
2535 for (i = 0; i < indent; i++)
2536 db_printf(" ");
2537 }
2538
2539 static void
2540 db_print_unpflags(int unp_flags)
2541 {
2542 int comma;
2543
2544 comma = 0;
2545 if (unp_flags & UNP_HAVEPC) {
2546 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2547 comma = 1;
2548 }
2549 if (unp_flags & UNP_HAVEPCCACHED) {
2550 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2551 comma = 1;
2552 }
2553 if (unp_flags & UNP_WANTCRED) {
2554 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2555 comma = 1;
2556 }
2557 if (unp_flags & UNP_CONNWAIT) {
2558 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2559 comma = 1;
2560 }
2561 if (unp_flags & UNP_CONNECTING) {
2562 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2563 comma = 1;
2564 }
2565 if (unp_flags & UNP_BINDING) {
2566 db_printf("%sUNP_BINDING", comma ? ", " : "");
2567 comma = 1;
2568 }
2569 }
2570
2571 static void
2572 db_print_xucred(int indent, struct xucred *xu)
2573 {
2574 int comma, i;
2575
2576 db_print_indent(indent);
2577 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2578 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2579 db_print_indent(indent);
2580 db_printf("cr_groups: ");
2581 comma = 0;
2582 for (i = 0; i < xu->cr_ngroups; i++) {
2583 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2584 comma = 1;
2585 }
2586 db_printf("\n");
2587 }
2588
2589 static void
2590 db_print_unprefs(int indent, struct unp_head *uh)
2591 {
2592 struct unpcb *unp;
2593 int counter;
2594
2595 counter = 0;
2596 LIST_FOREACH(unp, uh, unp_reflink) {
2597 if (counter % 4 == 0)
2598 db_print_indent(indent);
2599 db_printf("%p ", unp);
2600 if (counter % 4 == 3)
2601 db_printf("\n");
2602 counter++;
2603 }
2604 if (counter != 0 && counter % 4 != 0)
2605 db_printf("\n");
2606 }
2607
2608 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2609 {
2610 struct unpcb *unp;
2611
2612 if (!have_addr) {
2613 db_printf("usage: show unpcb <addr>\n");
2614 return;
2615 }
2616 unp = (struct unpcb *)addr;
2617
2618 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2619 unp->unp_vnode);
2620
2621 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2622 unp->unp_conn);
2623
2624 db_printf("unp_refs:\n");
2625 db_print_unprefs(2, &unp->unp_refs);
2626
2627 /* XXXRW: Would be nice to print the full address, if any. */
2628 db_printf("unp_addr: %p\n", unp->unp_addr);
2629
2630 db_printf("unp_gencnt: %llu\n",
2631 (unsigned long long)unp->unp_gencnt);
2632
2633 db_printf("unp_flags: %x (", unp->unp_flags);
2634 db_print_unpflags(unp->unp_flags);
2635 db_printf(")\n");
2636
2637 db_printf("unp_peercred:\n");
2638 db_print_xucred(2, &unp->unp_peercred);
2639
2640 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2641 }
2642 #endif
Cache object: dda053d06458a539ddd03ac28da577de
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