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: stable/10/sys/kern/uipc_usrreq.c 339068 2018-10-01 18:00:52Z asomers $");
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_shutdown(struct unpcb *);
282 static void unp_drop(struct unpcb *, int);
283 static void unp_gc(__unused void *, int);
284 static void unp_scan(struct mbuf *, void (*)(struct filedescent **, int));
285 static void unp_discard(struct file *);
286 static void unp_freerights(struct filedescent **, int);
287 static void unp_init(void);
288 static int unp_internalize(struct mbuf **, struct thread *);
289 static void unp_internalize_fp(struct file *);
290 static int unp_externalize(struct mbuf *, struct mbuf **, int);
291 static int unp_externalize_fp(struct file *);
292 static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
293 static void unp_process_defers(void * __unused, int);
294
295 /*
296 * Definitions of protocols supported in the LOCAL domain.
297 */
298 static struct domain localdomain;
299 static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
300 static struct pr_usrreqs uipc_usrreqs_seqpacket;
301 static struct protosw localsw[] = {
302 {
303 .pr_type = SOCK_STREAM,
304 .pr_domain = &localdomain,
305 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
306 .pr_ctloutput = &uipc_ctloutput,
307 .pr_usrreqs = &uipc_usrreqs_stream
308 },
309 {
310 .pr_type = SOCK_DGRAM,
311 .pr_domain = &localdomain,
312 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
313 .pr_ctloutput = &uipc_ctloutput,
314 .pr_usrreqs = &uipc_usrreqs_dgram
315 },
316 {
317 .pr_type = SOCK_SEQPACKET,
318 .pr_domain = &localdomain,
319
320 /*
321 * XXXRW: For now, PR_ADDR because soreceive will bump into them
322 * due to our use of sbappendaddr. A new sbappend variants is needed
323 * that supports both atomic record writes and control data.
324 */
325 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
326 PR_RIGHTS,
327 .pr_ctloutput = &uipc_ctloutput,
328 .pr_usrreqs = &uipc_usrreqs_seqpacket,
329 },
330 };
331
332 static struct domain localdomain = {
333 .dom_family = AF_LOCAL,
334 .dom_name = "local",
335 .dom_init = unp_init,
336 .dom_externalize = unp_externalize,
337 .dom_dispose = unp_dispose,
338 .dom_protosw = localsw,
339 .dom_protoswNPROTOSW = &localsw[sizeof(localsw)/sizeof(localsw[0])]
340 };
341 DOMAIN_SET(local);
342
343 static void
uipc_abort(struct socket * so)344 uipc_abort(struct socket *so)
345 {
346 struct unpcb *unp, *unp2;
347
348 unp = sotounpcb(so);
349 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
350
351 UNP_LINK_WLOCK();
352 UNP_PCB_LOCK(unp);
353 unp2 = unp->unp_conn;
354 if (unp2 != NULL) {
355 UNP_PCB_LOCK(unp2);
356 unp_drop(unp2, ECONNABORTED);
357 UNP_PCB_UNLOCK(unp2);
358 }
359 UNP_PCB_UNLOCK(unp);
360 UNP_LINK_WUNLOCK();
361 }
362
363 static int
uipc_accept(struct socket * so,struct sockaddr ** nam)364 uipc_accept(struct socket *so, struct sockaddr **nam)
365 {
366 struct unpcb *unp, *unp2;
367 const struct sockaddr *sa;
368
369 /*
370 * Pass back name of connected socket, if it was bound and we are
371 * still connected (our peer may have closed already!).
372 */
373 unp = sotounpcb(so);
374 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
375
376 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
377 UNP_LINK_RLOCK();
378 unp2 = unp->unp_conn;
379 if (unp2 != NULL && unp2->unp_addr != NULL) {
380 UNP_PCB_LOCK(unp2);
381 sa = (struct sockaddr *) unp2->unp_addr;
382 bcopy(sa, *nam, sa->sa_len);
383 UNP_PCB_UNLOCK(unp2);
384 } else {
385 sa = &sun_noname;
386 bcopy(sa, *nam, sa->sa_len);
387 }
388 UNP_LINK_RUNLOCK();
389 return (0);
390 }
391
392 static int
uipc_attach(struct socket * so,int proto,struct thread * td)393 uipc_attach(struct socket *so, int proto, struct thread *td)
394 {
395 u_long sendspace, recvspace;
396 struct unpcb *unp;
397 int error;
398
399 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
400 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
401 switch (so->so_type) {
402 case SOCK_STREAM:
403 sendspace = unpst_sendspace;
404 recvspace = unpst_recvspace;
405 break;
406
407 case SOCK_DGRAM:
408 sendspace = unpdg_sendspace;
409 recvspace = unpdg_recvspace;
410 break;
411
412 case SOCK_SEQPACKET:
413 sendspace = unpsp_sendspace;
414 recvspace = unpsp_recvspace;
415 break;
416
417 default:
418 panic("uipc_attach");
419 }
420 error = soreserve(so, sendspace, recvspace);
421 if (error)
422 return (error);
423 }
424 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
425 if (unp == NULL)
426 return (ENOBUFS);
427 LIST_INIT(&unp->unp_refs);
428 UNP_PCB_LOCK_INIT(unp);
429 unp->unp_socket = so;
430 so->so_pcb = unp;
431 unp->unp_refcount = 1;
432 if (so->so_head != NULL)
433 unp->unp_flags |= UNP_NASCENT;
434
435 UNP_LIST_LOCK();
436 unp->unp_gencnt = ++unp_gencnt;
437 unp_count++;
438 switch (so->so_type) {
439 case SOCK_STREAM:
440 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
441 break;
442
443 case SOCK_DGRAM:
444 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
445 break;
446
447 case SOCK_SEQPACKET:
448 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
449 break;
450
451 default:
452 panic("uipc_attach");
453 }
454 UNP_LIST_UNLOCK();
455
456 return (0);
457 }
458
459 static int
uipc_bindat(int fd,struct socket * so,struct sockaddr * nam,struct thread * td)460 uipc_bindat(int fd, struct socket *so, struct sockaddr *nam, struct thread *td)
461 {
462 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
463 struct vattr vattr;
464 int error, namelen;
465 struct nameidata nd;
466 struct unpcb *unp;
467 struct vnode *vp;
468 struct mount *mp;
469 cap_rights_t rights;
470 char *buf;
471
472 if (nam->sa_family != AF_UNIX)
473 return (EAFNOSUPPORT);
474
475 unp = sotounpcb(so);
476 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
477
478 if (soun->sun_len > sizeof(struct sockaddr_un))
479 return (EINVAL);
480 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
481 if (namelen <= 0)
482 return (EINVAL);
483
484 /*
485 * We don't allow simultaneous bind() calls on a single UNIX domain
486 * socket, so flag in-progress operations, and return an error if an
487 * operation is already in progress.
488 *
489 * Historically, we have not allowed a socket to be rebound, so this
490 * also returns an error. Not allowing re-binding simplifies the
491 * implementation and avoids a great many possible failure modes.
492 */
493 UNP_PCB_LOCK(unp);
494 if (unp->unp_vnode != NULL) {
495 UNP_PCB_UNLOCK(unp);
496 return (EINVAL);
497 }
498 if (unp->unp_flags & UNP_BINDING) {
499 UNP_PCB_UNLOCK(unp);
500 return (EALREADY);
501 }
502 unp->unp_flags |= UNP_BINDING;
503 UNP_PCB_UNLOCK(unp);
504
505 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
506 bcopy(soun->sun_path, buf, namelen);
507 buf[namelen] = 0;
508
509 restart:
510 NDINIT_ATRIGHTS(&nd, CREATE, NOFOLLOW | LOCKPARENT | SAVENAME | NOCACHE,
511 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_BINDAT), td);
512 /* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
513 error = namei(&nd);
514 if (error)
515 goto error;
516 vp = nd.ni_vp;
517 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
518 NDFREE(&nd, NDF_ONLY_PNBUF);
519 if (nd.ni_dvp == vp)
520 vrele(nd.ni_dvp);
521 else
522 vput(nd.ni_dvp);
523 if (vp != NULL) {
524 vrele(vp);
525 error = EADDRINUSE;
526 goto error;
527 }
528 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
529 if (error)
530 goto error;
531 goto restart;
532 }
533 VATTR_NULL(&vattr);
534 vattr.va_type = VSOCK;
535 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
536 #ifdef MAC
537 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
538 &vattr);
539 #endif
540 if (error == 0)
541 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
542 NDFREE(&nd, NDF_ONLY_PNBUF);
543 vput(nd.ni_dvp);
544 if (error) {
545 vn_finished_write(mp);
546 goto error;
547 }
548 vp = nd.ni_vp;
549 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
550 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
551
552 UNP_LINK_WLOCK();
553 UNP_PCB_LOCK(unp);
554 VOP_UNP_BIND(vp, unp->unp_socket);
555 unp->unp_vnode = vp;
556 unp->unp_addr = soun;
557 unp->unp_flags &= ~UNP_BINDING;
558 UNP_PCB_UNLOCK(unp);
559 UNP_LINK_WUNLOCK();
560 VOP_UNLOCK(vp, 0);
561 vn_finished_write(mp);
562 free(buf, M_TEMP);
563 return (0);
564
565 error:
566 UNP_PCB_LOCK(unp);
567 unp->unp_flags &= ~UNP_BINDING;
568 UNP_PCB_UNLOCK(unp);
569 free(buf, M_TEMP);
570 return (error);
571 }
572
573 static int
uipc_bind(struct socket * so,struct sockaddr * nam,struct thread * td)574 uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
575 {
576
577 return (uipc_bindat(AT_FDCWD, so, nam, td));
578 }
579
580 static int
uipc_connect(struct socket * so,struct sockaddr * nam,struct thread * td)581 uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
582 {
583 int error;
584
585 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
586 UNP_LINK_WLOCK();
587 error = unp_connect(so, nam, td);
588 UNP_LINK_WUNLOCK();
589 return (error);
590 }
591
592 static int
uipc_connectat(int fd,struct socket * so,struct sockaddr * nam,struct thread * td)593 uipc_connectat(int fd, struct socket *so, struct sockaddr *nam,
594 struct thread *td)
595 {
596 int error;
597
598 KASSERT(td == curthread, ("uipc_connectat: td != curthread"));
599 UNP_LINK_WLOCK();
600 error = unp_connectat(fd, so, nam, td);
601 UNP_LINK_WUNLOCK();
602 return (error);
603 }
604
605 static void
uipc_close(struct socket * so)606 uipc_close(struct socket *so)
607 {
608 struct unpcb *unp, *unp2;
609
610 unp = sotounpcb(so);
611 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
612
613 UNP_LINK_WLOCK();
614 UNP_PCB_LOCK(unp);
615 unp2 = unp->unp_conn;
616 if (unp2 != NULL) {
617 UNP_PCB_LOCK(unp2);
618 unp_disconnect(unp, unp2);
619 UNP_PCB_UNLOCK(unp2);
620 }
621 UNP_PCB_UNLOCK(unp);
622 UNP_LINK_WUNLOCK();
623 }
624
625 static int
uipc_connect2(struct socket * so1,struct socket * so2)626 uipc_connect2(struct socket *so1, struct socket *so2)
627 {
628 struct unpcb *unp, *unp2;
629 int error;
630
631 UNP_LINK_WLOCK();
632 unp = so1->so_pcb;
633 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
634 UNP_PCB_LOCK(unp);
635 unp2 = so2->so_pcb;
636 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
637 UNP_PCB_LOCK(unp2);
638 error = unp_connect2(so1, so2, PRU_CONNECT2);
639 UNP_PCB_UNLOCK(unp2);
640 UNP_PCB_UNLOCK(unp);
641 UNP_LINK_WUNLOCK();
642 return (error);
643 }
644
645 static void
uipc_detach(struct socket * so)646 uipc_detach(struct socket *so)
647 {
648 struct unpcb *unp, *unp2;
649 struct sockaddr_un *saved_unp_addr;
650 struct vnode *vp;
651 int freeunp, local_unp_rights;
652
653 unp = sotounpcb(so);
654 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
655
656 vp = NULL;
657 local_unp_rights = 0;
658
659 UNP_LIST_LOCK();
660 LIST_REMOVE(unp, unp_link);
661 unp->unp_gencnt = ++unp_gencnt;
662 --unp_count;
663 UNP_LIST_UNLOCK();
664
665 if ((unp->unp_flags & UNP_NASCENT) != 0) {
666 UNP_PCB_LOCK(unp);
667 goto teardown;
668 }
669 UNP_LINK_WLOCK();
670 UNP_PCB_LOCK(unp);
671
672 /*
673 * XXXRW: Should assert vp->v_socket == so.
674 */
675 if ((vp = unp->unp_vnode) != NULL) {
676 VOP_UNP_DETACH(vp);
677 unp->unp_vnode = NULL;
678 }
679 unp2 = unp->unp_conn;
680 if (unp2 != NULL) {
681 UNP_PCB_LOCK(unp2);
682 unp_disconnect(unp, unp2);
683 UNP_PCB_UNLOCK(unp2);
684 }
685
686 /*
687 * We hold the linkage lock exclusively, so it's OK to acquire
688 * multiple pcb locks at a time.
689 */
690 while (!LIST_EMPTY(&unp->unp_refs)) {
691 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
692
693 UNP_PCB_LOCK(ref);
694 unp_drop(ref, ECONNRESET);
695 UNP_PCB_UNLOCK(ref);
696 }
697 local_unp_rights = unp_rights;
698 UNP_LINK_WUNLOCK();
699 teardown:
700 unp->unp_socket->so_pcb = NULL;
701 saved_unp_addr = unp->unp_addr;
702 unp->unp_addr = NULL;
703 unp->unp_refcount--;
704 freeunp = (unp->unp_refcount == 0);
705 if (saved_unp_addr != NULL)
706 free(saved_unp_addr, M_SONAME);
707 if (freeunp) {
708 UNP_PCB_LOCK_DESTROY(unp);
709 uma_zfree(unp_zone, unp);
710 } else
711 UNP_PCB_UNLOCK(unp);
712 if (vp)
713 vrele(vp);
714 if (local_unp_rights)
715 taskqueue_enqueue_timeout(taskqueue_thread, &unp_gc_task, -1);
716 }
717
718 static int
uipc_disconnect(struct socket * so)719 uipc_disconnect(struct socket *so)
720 {
721 struct unpcb *unp, *unp2;
722
723 unp = sotounpcb(so);
724 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
725
726 UNP_LINK_WLOCK();
727 UNP_PCB_LOCK(unp);
728 unp2 = unp->unp_conn;
729 if (unp2 != NULL) {
730 UNP_PCB_LOCK(unp2);
731 unp_disconnect(unp, unp2);
732 UNP_PCB_UNLOCK(unp2);
733 }
734 UNP_PCB_UNLOCK(unp);
735 UNP_LINK_WUNLOCK();
736 return (0);
737 }
738
739 static int
uipc_listen(struct socket * so,int backlog,struct thread * td)740 uipc_listen(struct socket *so, int backlog, struct thread *td)
741 {
742 struct unpcb *unp;
743 int error;
744
745 unp = sotounpcb(so);
746 KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
747
748 UNP_PCB_LOCK(unp);
749 if (unp->unp_vnode == NULL) {
750 UNP_PCB_UNLOCK(unp);
751 return (EINVAL);
752 }
753
754 SOCK_LOCK(so);
755 error = solisten_proto_check(so);
756 if (error == 0) {
757 cru2x(td->td_ucred, &unp->unp_peercred);
758 unp->unp_flags |= UNP_HAVEPCCACHED;
759 solisten_proto(so, backlog);
760 }
761 SOCK_UNLOCK(so);
762 UNP_PCB_UNLOCK(unp);
763 return (error);
764 }
765
766 static int
uipc_peeraddr(struct socket * so,struct sockaddr ** nam)767 uipc_peeraddr(struct socket *so, struct sockaddr **nam)
768 {
769 struct unpcb *unp, *unp2;
770 const struct sockaddr *sa;
771
772 unp = sotounpcb(so);
773 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
774
775 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
776 UNP_LINK_RLOCK();
777 /*
778 * XXX: It seems that this test always fails even when connection is
779 * established. So, this else clause is added as workaround to
780 * return PF_LOCAL sockaddr.
781 */
782 unp2 = unp->unp_conn;
783 if (unp2 != NULL) {
784 UNP_PCB_LOCK(unp2);
785 if (unp2->unp_addr != NULL)
786 sa = (struct sockaddr *) unp2->unp_addr;
787 else
788 sa = &sun_noname;
789 bcopy(sa, *nam, sa->sa_len);
790 UNP_PCB_UNLOCK(unp2);
791 } else {
792 sa = &sun_noname;
793 bcopy(sa, *nam, sa->sa_len);
794 }
795 UNP_LINK_RUNLOCK();
796 return (0);
797 }
798
799 static int
uipc_rcvd(struct socket * so,int flags)800 uipc_rcvd(struct socket *so, int flags)
801 {
802 struct unpcb *unp, *unp2;
803 struct socket *so2;
804 u_int mbcnt, sbcc;
805
806 unp = sotounpcb(so);
807 KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
808
809 if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
810 panic("uipc_rcvd socktype %d", so->so_type);
811
812 /*
813 * Adjust backpressure on sender and wakeup any waiting to write.
814 *
815 * The unp lock is acquired to maintain the validity of the unp_conn
816 * pointer; no lock on unp2 is required as unp2->unp_socket will be
817 * static as long as we don't permit unp2 to disconnect from unp,
818 * which is prevented by the lock on unp. We cache values from
819 * so_rcv to avoid holding the so_rcv lock over the entire
820 * transaction on the remote so_snd.
821 */
822 SOCKBUF_LOCK(&so->so_rcv);
823 mbcnt = so->so_rcv.sb_mbcnt;
824 sbcc = so->so_rcv.sb_cc;
825 SOCKBUF_UNLOCK(&so->so_rcv);
826 /*
827 * There is a benign race condition at this point. If we're planning to
828 * clear SB_STOP, but uipc_send is called on the connected socket at
829 * this instant, it might add data to the sockbuf and set SB_STOP. Then
830 * we would erroneously clear SB_STOP below, even though the sockbuf is
831 * full. The race is benign because the only ill effect is to allow the
832 * sockbuf to exceed its size limit, and the size limits are not
833 * strictly guaranteed anyway.
834 */
835 UNP_PCB_LOCK(unp);
836 unp2 = unp->unp_conn;
837 if (unp2 == NULL) {
838 UNP_PCB_UNLOCK(unp);
839 return (0);
840 }
841 so2 = unp2->unp_socket;
842 SOCKBUF_LOCK(&so2->so_snd);
843 if (sbcc < so2->so_snd.sb_hiwat && mbcnt < so2->so_snd.sb_mbmax)
844 so2->so_snd.sb_flags &= ~SB_STOP;
845 sowwakeup_locked(so2);
846 UNP_PCB_UNLOCK(unp);
847 return (0);
848 }
849
850 static int
uipc_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)851 uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
852 struct mbuf *control, struct thread *td)
853 {
854 struct unpcb *unp, *unp2;
855 struct socket *so2;
856 u_int mbcnt, sbcc;
857 int error = 0;
858
859 unp = sotounpcb(so);
860 KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
861
862 if (flags & PRUS_OOB) {
863 error = EOPNOTSUPP;
864 goto release;
865 }
866 if (control != NULL && (error = unp_internalize(&control, td)))
867 goto release;
868 if ((nam != NULL) || (flags & PRUS_EOF))
869 UNP_LINK_WLOCK();
870 else
871 UNP_LINK_RLOCK();
872 switch (so->so_type) {
873 case SOCK_DGRAM:
874 {
875 const struct sockaddr *from;
876
877 unp2 = unp->unp_conn;
878 if (nam != NULL) {
879 UNP_LINK_WLOCK_ASSERT();
880 if (unp2 != NULL) {
881 error = EISCONN;
882 break;
883 }
884 error = unp_connect(so, nam, td);
885 if (error)
886 break;
887 unp2 = unp->unp_conn;
888 }
889
890 /*
891 * Because connect() and send() are non-atomic in a sendto()
892 * with a target address, it's possible that the socket will
893 * have disconnected before the send() can run. In that case
894 * return the slightly counter-intuitive but otherwise
895 * correct error that the socket is not connected.
896 */
897 if (unp2 == NULL) {
898 error = ENOTCONN;
899 break;
900 }
901 /* Lockless read. */
902 if (unp2->unp_flags & UNP_WANTCRED)
903 control = unp_addsockcred(td, control);
904 UNP_PCB_LOCK(unp);
905 if (unp->unp_addr != NULL)
906 from = (struct sockaddr *)unp->unp_addr;
907 else
908 from = &sun_noname;
909 so2 = unp2->unp_socket;
910 SOCKBUF_LOCK(&so2->so_rcv);
911 if (sbappendaddr_locked(&so2->so_rcv, from, m,
912 control)) {
913 sorwakeup_locked(so2);
914 m = NULL;
915 control = NULL;
916 } else {
917 SOCKBUF_UNLOCK(&so2->so_rcv);
918 error = ENOBUFS;
919 }
920 if (nam != NULL) {
921 UNP_LINK_WLOCK_ASSERT();
922 UNP_PCB_LOCK(unp2);
923 unp_disconnect(unp, unp2);
924 UNP_PCB_UNLOCK(unp2);
925 }
926 UNP_PCB_UNLOCK(unp);
927 break;
928 }
929
930 case SOCK_SEQPACKET:
931 case SOCK_STREAM:
932 if ((so->so_state & SS_ISCONNECTED) == 0) {
933 if (nam != NULL) {
934 UNP_LINK_WLOCK_ASSERT();
935 error = unp_connect(so, nam, td);
936 if (error)
937 break; /* XXX */
938 } else {
939 error = ENOTCONN;
940 break;
941 }
942 }
943
944 /* Lockless read. */
945 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
946 error = EPIPE;
947 break;
948 }
949
950 /*
951 * Because connect() and send() are non-atomic in a sendto()
952 * with a target address, it's possible that the socket will
953 * have disconnected before the send() can run. In that case
954 * return the slightly counter-intuitive but otherwise
955 * correct error that the socket is not connected.
956 *
957 * Locking here must be done carefully: the linkage lock
958 * prevents interconnections between unpcbs from changing, so
959 * we can traverse from unp to unp2 without acquiring unp's
960 * lock. Socket buffer locks follow unpcb locks, so we can
961 * acquire both remote and lock socket buffer locks.
962 */
963 unp2 = unp->unp_conn;
964 if (unp2 == NULL) {
965 error = ENOTCONN;
966 break;
967 }
968 so2 = unp2->unp_socket;
969 UNP_PCB_LOCK(unp2);
970 SOCKBUF_LOCK(&so2->so_rcv);
971 if (unp2->unp_flags & UNP_WANTCRED) {
972 /*
973 * Credentials are passed only once on SOCK_STREAM
974 * and SOCK_SEQPACKET.
975 */
976 unp2->unp_flags &= ~UNP_WANTCRED;
977 control = unp_addsockcred(td, control);
978 }
979 /*
980 * Send to paired receive port, and then reduce send buffer
981 * hiwater marks to maintain backpressure. Wake up readers.
982 */
983 switch (so->so_type) {
984 case SOCK_STREAM:
985 if (control != NULL) {
986 if (sbappendcontrol_locked(&so2->so_rcv, m,
987 control))
988 control = NULL;
989 } else
990 sbappend_locked(&so2->so_rcv, m);
991 break;
992
993 case SOCK_SEQPACKET: {
994 const struct sockaddr *from;
995
996 from = &sun_noname;
997 /*
998 * Don't check for space available in so2->so_rcv.
999 * Unix domain sockets only check for space in the
1000 * sending sockbuf, and that check is performed one
1001 * level up the stack.
1002 */
1003 if (sbappendaddr_nospacecheck_locked(&so2->so_rcv,
1004 from, m, control))
1005 control = NULL;
1006 break;
1007 }
1008 }
1009
1010 mbcnt = so2->so_rcv.sb_mbcnt;
1011 sbcc = so2->so_rcv.sb_cc;
1012 sorwakeup_locked(so2);
1013
1014 /*
1015 * The PCB lock on unp2 protects the SB_STOP flag. Without it,
1016 * it would be possible for uipc_rcvd to be called at this
1017 * point, drain the receiving sockbuf, clear SB_STOP, and then
1018 * we would set SB_STOP below. That could lead to an empty
1019 * sockbuf having SB_STOP set
1020 */
1021 SOCKBUF_LOCK(&so->so_snd);
1022 if (sbcc >= so->so_snd.sb_hiwat || mbcnt >= so->so_snd.sb_mbmax)
1023 so->so_snd.sb_flags |= SB_STOP;
1024 SOCKBUF_UNLOCK(&so->so_snd);
1025 UNP_PCB_UNLOCK(unp2);
1026 m = NULL;
1027 break;
1028
1029 default:
1030 panic("uipc_send unknown socktype");
1031 }
1032
1033 /*
1034 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
1035 */
1036 if (flags & PRUS_EOF) {
1037 UNP_PCB_LOCK(unp);
1038 socantsendmore(so);
1039 unp_shutdown(unp);
1040 UNP_PCB_UNLOCK(unp);
1041 }
1042
1043 if ((nam != NULL) || (flags & PRUS_EOF))
1044 UNP_LINK_WUNLOCK();
1045 else
1046 UNP_LINK_RUNLOCK();
1047
1048 if (control != NULL && error != 0)
1049 unp_dispose(control);
1050
1051 release:
1052 if (control != NULL)
1053 m_freem(control);
1054 if (m != NULL)
1055 m_freem(m);
1056 return (error);
1057 }
1058
1059 static int
uipc_sense(struct socket * so,struct stat * sb)1060 uipc_sense(struct socket *so, struct stat *sb)
1061 {
1062 struct unpcb *unp;
1063
1064 unp = sotounpcb(so);
1065 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1066
1067 sb->st_blksize = so->so_snd.sb_hiwat;
1068 UNP_PCB_LOCK(unp);
1069 sb->st_dev = NODEV;
1070 if (unp->unp_ino == 0)
1071 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1072 sb->st_ino = unp->unp_ino;
1073 UNP_PCB_UNLOCK(unp);
1074 return (0);
1075 }
1076
1077 static int
uipc_shutdown(struct socket * so)1078 uipc_shutdown(struct socket *so)
1079 {
1080 struct unpcb *unp;
1081
1082 unp = sotounpcb(so);
1083 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1084
1085 UNP_LINK_WLOCK();
1086 UNP_PCB_LOCK(unp);
1087 socantsendmore(so);
1088 unp_shutdown(unp);
1089 UNP_PCB_UNLOCK(unp);
1090 UNP_LINK_WUNLOCK();
1091 return (0);
1092 }
1093
1094 static int
uipc_sockaddr(struct socket * so,struct sockaddr ** nam)1095 uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1096 {
1097 struct unpcb *unp;
1098 const struct sockaddr *sa;
1099
1100 unp = sotounpcb(so);
1101 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1102
1103 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1104 UNP_PCB_LOCK(unp);
1105 if (unp->unp_addr != NULL)
1106 sa = (struct sockaddr *) unp->unp_addr;
1107 else
1108 sa = &sun_noname;
1109 bcopy(sa, *nam, sa->sa_len);
1110 UNP_PCB_UNLOCK(unp);
1111 return (0);
1112 }
1113
1114 static struct pr_usrreqs uipc_usrreqs_dgram = {
1115 .pru_abort = uipc_abort,
1116 .pru_accept = uipc_accept,
1117 .pru_attach = uipc_attach,
1118 .pru_bind = uipc_bind,
1119 .pru_bindat = uipc_bindat,
1120 .pru_connect = uipc_connect,
1121 .pru_connectat = uipc_connectat,
1122 .pru_connect2 = uipc_connect2,
1123 .pru_detach = uipc_detach,
1124 .pru_disconnect = uipc_disconnect,
1125 .pru_listen = uipc_listen,
1126 .pru_peeraddr = uipc_peeraddr,
1127 .pru_rcvd = uipc_rcvd,
1128 .pru_send = uipc_send,
1129 .pru_sense = uipc_sense,
1130 .pru_shutdown = uipc_shutdown,
1131 .pru_sockaddr = uipc_sockaddr,
1132 .pru_soreceive = soreceive_dgram,
1133 .pru_close = uipc_close,
1134 };
1135
1136 static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1137 .pru_abort = uipc_abort,
1138 .pru_accept = uipc_accept,
1139 .pru_attach = uipc_attach,
1140 .pru_bind = uipc_bind,
1141 .pru_bindat = uipc_bindat,
1142 .pru_connect = uipc_connect,
1143 .pru_connectat = uipc_connectat,
1144 .pru_connect2 = uipc_connect2,
1145 .pru_detach = uipc_detach,
1146 .pru_disconnect = uipc_disconnect,
1147 .pru_listen = uipc_listen,
1148 .pru_peeraddr = uipc_peeraddr,
1149 .pru_rcvd = uipc_rcvd,
1150 .pru_send = uipc_send,
1151 .pru_sense = uipc_sense,
1152 .pru_shutdown = uipc_shutdown,
1153 .pru_sockaddr = uipc_sockaddr,
1154 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1155 .pru_close = uipc_close,
1156 };
1157
1158 static struct pr_usrreqs uipc_usrreqs_stream = {
1159 .pru_abort = uipc_abort,
1160 .pru_accept = uipc_accept,
1161 .pru_attach = uipc_attach,
1162 .pru_bind = uipc_bind,
1163 .pru_bindat = uipc_bindat,
1164 .pru_connect = uipc_connect,
1165 .pru_connectat = uipc_connectat,
1166 .pru_connect2 = uipc_connect2,
1167 .pru_detach = uipc_detach,
1168 .pru_disconnect = uipc_disconnect,
1169 .pru_listen = uipc_listen,
1170 .pru_peeraddr = uipc_peeraddr,
1171 .pru_rcvd = uipc_rcvd,
1172 .pru_send = uipc_send,
1173 .pru_sense = uipc_sense,
1174 .pru_shutdown = uipc_shutdown,
1175 .pru_sockaddr = uipc_sockaddr,
1176 .pru_soreceive = soreceive_generic,
1177 .pru_close = uipc_close,
1178 };
1179
1180 static int
uipc_ctloutput(struct socket * so,struct sockopt * sopt)1181 uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1182 {
1183 struct unpcb *unp;
1184 struct xucred xu;
1185 int error, optval;
1186
1187 if (sopt->sopt_level != 0)
1188 return (EINVAL);
1189
1190 unp = sotounpcb(so);
1191 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1192 error = 0;
1193 switch (sopt->sopt_dir) {
1194 case SOPT_GET:
1195 switch (sopt->sopt_name) {
1196 case LOCAL_PEERCRED:
1197 UNP_PCB_LOCK(unp);
1198 if (unp->unp_flags & UNP_HAVEPC)
1199 xu = unp->unp_peercred;
1200 else {
1201 if (so->so_type == SOCK_STREAM)
1202 error = ENOTCONN;
1203 else
1204 error = EINVAL;
1205 }
1206 UNP_PCB_UNLOCK(unp);
1207 if (error == 0)
1208 error = sooptcopyout(sopt, &xu, sizeof(xu));
1209 break;
1210
1211 case LOCAL_CREDS:
1212 /* Unlocked read. */
1213 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1214 error = sooptcopyout(sopt, &optval, sizeof(optval));
1215 break;
1216
1217 case LOCAL_CONNWAIT:
1218 /* Unlocked read. */
1219 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1220 error = sooptcopyout(sopt, &optval, sizeof(optval));
1221 break;
1222
1223 default:
1224 error = EOPNOTSUPP;
1225 break;
1226 }
1227 break;
1228
1229 case SOPT_SET:
1230 switch (sopt->sopt_name) {
1231 case LOCAL_CREDS:
1232 case LOCAL_CONNWAIT:
1233 error = sooptcopyin(sopt, &optval, sizeof(optval),
1234 sizeof(optval));
1235 if (error)
1236 break;
1237
1238 #define OPTSET(bit) do { \
1239 UNP_PCB_LOCK(unp); \
1240 if (optval) \
1241 unp->unp_flags |= bit; \
1242 else \
1243 unp->unp_flags &= ~bit; \
1244 UNP_PCB_UNLOCK(unp); \
1245 } while (0)
1246
1247 switch (sopt->sopt_name) {
1248 case LOCAL_CREDS:
1249 OPTSET(UNP_WANTCRED);
1250 break;
1251
1252 case LOCAL_CONNWAIT:
1253 OPTSET(UNP_CONNWAIT);
1254 break;
1255
1256 default:
1257 break;
1258 }
1259 break;
1260 #undef OPTSET
1261 default:
1262 error = ENOPROTOOPT;
1263 break;
1264 }
1265 break;
1266
1267 default:
1268 error = EOPNOTSUPP;
1269 break;
1270 }
1271 return (error);
1272 }
1273
1274 static int
unp_connect(struct socket * so,struct sockaddr * nam,struct thread * td)1275 unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1276 {
1277
1278 return (unp_connectat(AT_FDCWD, so, nam, td));
1279 }
1280
1281 static int
unp_connectat(int fd,struct socket * so,struct sockaddr * nam,struct thread * td)1282 unp_connectat(int fd, struct socket *so, struct sockaddr *nam,
1283 struct thread *td)
1284 {
1285 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1286 struct vnode *vp;
1287 struct socket *so2, *so3;
1288 struct unpcb *unp, *unp2, *unp3;
1289 struct nameidata nd;
1290 char buf[SOCK_MAXADDRLEN];
1291 struct sockaddr *sa;
1292 cap_rights_t rights;
1293 int error, len;
1294
1295 if (nam->sa_family != AF_UNIX)
1296 return (EAFNOSUPPORT);
1297
1298 UNP_LINK_WLOCK_ASSERT();
1299
1300 unp = sotounpcb(so);
1301 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1302
1303 if (nam->sa_len > sizeof(struct sockaddr_un))
1304 return (EINVAL);
1305 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1306 if (len <= 0)
1307 return (EINVAL);
1308 bcopy(soun->sun_path, buf, len);
1309 buf[len] = 0;
1310
1311 UNP_PCB_LOCK(unp);
1312 if (unp->unp_flags & UNP_CONNECTING) {
1313 UNP_PCB_UNLOCK(unp);
1314 return (EALREADY);
1315 }
1316 UNP_LINK_WUNLOCK();
1317 unp->unp_flags |= UNP_CONNECTING;
1318 UNP_PCB_UNLOCK(unp);
1319
1320 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1321 NDINIT_ATRIGHTS(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF,
1322 UIO_SYSSPACE, buf, fd, cap_rights_init(&rights, CAP_CONNECTAT), td);
1323 error = namei(&nd);
1324 if (error)
1325 vp = NULL;
1326 else
1327 vp = nd.ni_vp;
1328 ASSERT_VOP_LOCKED(vp, "unp_connect");
1329 NDFREE(&nd, NDF_ONLY_PNBUF);
1330 if (error)
1331 goto bad;
1332
1333 if (vp->v_type != VSOCK) {
1334 error = ENOTSOCK;
1335 goto bad;
1336 }
1337 #ifdef MAC
1338 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1339 if (error)
1340 goto bad;
1341 #endif
1342 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1343 if (error)
1344 goto bad;
1345
1346 unp = sotounpcb(so);
1347 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1348
1349 /*
1350 * Lock linkage lock for two reasons: make sure v_socket is stable,
1351 * and to protect simultaneous locking of multiple pcbs.
1352 */
1353 UNP_LINK_WLOCK();
1354 VOP_UNP_CONNECT(vp, &so2);
1355 if (so2 == NULL) {
1356 error = ECONNREFUSED;
1357 goto bad2;
1358 }
1359 if (so->so_type != so2->so_type) {
1360 error = EPROTOTYPE;
1361 goto bad2;
1362 }
1363 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1364 if (so2->so_options & SO_ACCEPTCONN) {
1365 CURVNET_SET(so2->so_vnet);
1366 so3 = sonewconn(so2, 0);
1367 CURVNET_RESTORE();
1368 } else
1369 so3 = NULL;
1370 if (so3 == NULL) {
1371 error = ECONNREFUSED;
1372 goto bad2;
1373 }
1374 unp = sotounpcb(so);
1375 unp2 = sotounpcb(so2);
1376 unp3 = sotounpcb(so3);
1377 UNP_PCB_LOCK(unp);
1378 UNP_PCB_LOCK(unp2);
1379 UNP_PCB_LOCK(unp3);
1380 if (unp2->unp_addr != NULL) {
1381 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1382 unp3->unp_addr = (struct sockaddr_un *) sa;
1383 sa = NULL;
1384 }
1385
1386 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1387 ("unp_connect: listener without cached peercred"));
1388 unp_copy_peercred(td, unp3, unp, unp2);
1389
1390 UNP_PCB_UNLOCK(unp3);
1391 UNP_PCB_UNLOCK(unp2);
1392 UNP_PCB_UNLOCK(unp);
1393 #ifdef MAC
1394 mac_socketpeer_set_from_socket(so, so3);
1395 mac_socketpeer_set_from_socket(so3, so);
1396 #endif
1397
1398 so2 = so3;
1399 }
1400 unp = sotounpcb(so);
1401 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1402 unp2 = sotounpcb(so2);
1403 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1404 UNP_PCB_LOCK(unp);
1405 UNP_PCB_LOCK(unp2);
1406 error = unp_connect2(so, so2, PRU_CONNECT);
1407 UNP_PCB_UNLOCK(unp2);
1408 UNP_PCB_UNLOCK(unp);
1409 bad2:
1410 UNP_LINK_WUNLOCK();
1411 bad:
1412 if (vp != NULL)
1413 vput(vp);
1414 free(sa, M_SONAME);
1415 UNP_LINK_WLOCK();
1416 UNP_PCB_LOCK(unp);
1417 unp->unp_flags &= ~UNP_CONNECTING;
1418 UNP_PCB_UNLOCK(unp);
1419 return (error);
1420 }
1421
1422 /*
1423 * Set socket peer credentials at connection time.
1424 *
1425 * The client's PCB credentials are copied from its process structure. The
1426 * server's PCB credentials are copied from the socket on which it called
1427 * listen(2). uipc_listen cached that process's credentials at the time.
1428 */
1429 void
unp_copy_peercred(struct thread * td,struct unpcb * client_unp,struct unpcb * server_unp,struct unpcb * listen_unp)1430 unp_copy_peercred(struct thread *td, struct unpcb *client_unp,
1431 struct unpcb *server_unp, struct unpcb *listen_unp)
1432 {
1433 cru2x(td->td_ucred, &client_unp->unp_peercred);
1434 client_unp->unp_flags |= UNP_HAVEPC;
1435
1436 memcpy(&server_unp->unp_peercred, &listen_unp->unp_peercred,
1437 sizeof(server_unp->unp_peercred));
1438 server_unp->unp_flags |= UNP_HAVEPC;
1439 if (listen_unp->unp_flags & UNP_WANTCRED)
1440 client_unp->unp_flags |= UNP_WANTCRED;
1441 }
1442
1443 static int
unp_connect2(struct socket * so,struct socket * so2,int req)1444 unp_connect2(struct socket *so, struct socket *so2, int req)
1445 {
1446 struct unpcb *unp;
1447 struct unpcb *unp2;
1448
1449 unp = sotounpcb(so);
1450 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1451 unp2 = sotounpcb(so2);
1452 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1453
1454 UNP_LINK_WLOCK_ASSERT();
1455 UNP_PCB_LOCK_ASSERT(unp);
1456 UNP_PCB_LOCK_ASSERT(unp2);
1457
1458 if (so2->so_type != so->so_type)
1459 return (EPROTOTYPE);
1460 unp2->unp_flags &= ~UNP_NASCENT;
1461 unp->unp_conn = unp2;
1462
1463 switch (so->so_type) {
1464 case SOCK_DGRAM:
1465 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1466 soisconnected(so);
1467 break;
1468
1469 case SOCK_STREAM:
1470 case SOCK_SEQPACKET:
1471 unp2->unp_conn = unp;
1472 if (req == PRU_CONNECT &&
1473 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1474 soisconnecting(so);
1475 else
1476 soisconnected(so);
1477 soisconnected(so2);
1478 break;
1479
1480 default:
1481 panic("unp_connect2");
1482 }
1483 return (0);
1484 }
1485
1486 static void
unp_disconnect(struct unpcb * unp,struct unpcb * unp2)1487 unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1488 {
1489 struct socket *so;
1490
1491 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1492
1493 UNP_LINK_WLOCK_ASSERT();
1494 UNP_PCB_LOCK_ASSERT(unp);
1495 UNP_PCB_LOCK_ASSERT(unp2);
1496
1497 unp->unp_conn = NULL;
1498 switch (unp->unp_socket->so_type) {
1499 case SOCK_DGRAM:
1500 LIST_REMOVE(unp, unp_reflink);
1501 so = unp->unp_socket;
1502 SOCK_LOCK(so);
1503 so->so_state &= ~SS_ISCONNECTED;
1504 SOCK_UNLOCK(so);
1505 break;
1506
1507 case SOCK_STREAM:
1508 case SOCK_SEQPACKET:
1509 soisdisconnected(unp->unp_socket);
1510 unp2->unp_conn = NULL;
1511 soisdisconnected(unp2->unp_socket);
1512 break;
1513 }
1514 }
1515
1516 /*
1517 * unp_pcblist() walks the global list of struct unpcb's to generate a
1518 * pointer list, bumping the refcount on each unpcb. It then copies them out
1519 * sequentially, validating the generation number on each to see if it has
1520 * been detached. All of this is necessary because copyout() may sleep on
1521 * disk I/O.
1522 */
1523 static int
unp_pcblist(SYSCTL_HANDLER_ARGS)1524 unp_pcblist(SYSCTL_HANDLER_ARGS)
1525 {
1526 int error, i, n;
1527 int freeunp;
1528 struct unpcb *unp, **unp_list;
1529 unp_gen_t gencnt;
1530 struct xunpgen *xug;
1531 struct unp_head *head;
1532 struct xunpcb *xu;
1533
1534 switch ((intptr_t)arg1) {
1535 case SOCK_STREAM:
1536 head = &unp_shead;
1537 break;
1538
1539 case SOCK_DGRAM:
1540 head = &unp_dhead;
1541 break;
1542
1543 case SOCK_SEQPACKET:
1544 head = &unp_sphead;
1545 break;
1546
1547 default:
1548 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1549 }
1550
1551 /*
1552 * The process of preparing the PCB list is too time-consuming and
1553 * resource-intensive to repeat twice on every request.
1554 */
1555 if (req->oldptr == NULL) {
1556 n = unp_count;
1557 req->oldidx = 2 * (sizeof *xug)
1558 + (n + n/8) * sizeof(struct xunpcb);
1559 return (0);
1560 }
1561
1562 if (req->newptr != NULL)
1563 return (EPERM);
1564
1565 /*
1566 * OK, now we're committed to doing something.
1567 */
1568 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1569 UNP_LIST_LOCK();
1570 gencnt = unp_gencnt;
1571 n = unp_count;
1572 UNP_LIST_UNLOCK();
1573
1574 xug->xug_len = sizeof *xug;
1575 xug->xug_count = n;
1576 xug->xug_gen = gencnt;
1577 xug->xug_sogen = so_gencnt;
1578 error = SYSCTL_OUT(req, xug, sizeof *xug);
1579 if (error) {
1580 free(xug, M_TEMP);
1581 return (error);
1582 }
1583
1584 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1585
1586 UNP_LIST_LOCK();
1587 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1588 unp = LIST_NEXT(unp, unp_link)) {
1589 UNP_PCB_LOCK(unp);
1590 if (unp->unp_gencnt <= gencnt) {
1591 if (cr_cansee(req->td->td_ucred,
1592 unp->unp_socket->so_cred)) {
1593 UNP_PCB_UNLOCK(unp);
1594 continue;
1595 }
1596 unp_list[i++] = unp;
1597 unp->unp_refcount++;
1598 }
1599 UNP_PCB_UNLOCK(unp);
1600 }
1601 UNP_LIST_UNLOCK();
1602 n = i; /* In case we lost some during malloc. */
1603
1604 error = 0;
1605 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1606 for (i = 0; i < n; i++) {
1607 unp = unp_list[i];
1608 UNP_PCB_LOCK(unp);
1609 unp->unp_refcount--;
1610 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1611 xu->xu_len = sizeof *xu;
1612 xu->xu_unpp = unp;
1613 /*
1614 * XXX - need more locking here to protect against
1615 * connect/disconnect races for SMP.
1616 */
1617 if (unp->unp_addr != NULL)
1618 bcopy(unp->unp_addr, &xu->xu_addr,
1619 unp->unp_addr->sun_len);
1620 if (unp->unp_conn != NULL &&
1621 unp->unp_conn->unp_addr != NULL)
1622 bcopy(unp->unp_conn->unp_addr,
1623 &xu->xu_caddr,
1624 unp->unp_conn->unp_addr->sun_len);
1625 bcopy(unp, &xu->xu_unp, sizeof *unp);
1626 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1627 UNP_PCB_UNLOCK(unp);
1628 error = SYSCTL_OUT(req, xu, sizeof *xu);
1629 } else {
1630 freeunp = (unp->unp_refcount == 0);
1631 UNP_PCB_UNLOCK(unp);
1632 if (freeunp) {
1633 UNP_PCB_LOCK_DESTROY(unp);
1634 uma_zfree(unp_zone, unp);
1635 }
1636 }
1637 }
1638 free(xu, M_TEMP);
1639 if (!error) {
1640 /*
1641 * Give the user an updated idea of our state. If the
1642 * generation differs from what we told her before, she knows
1643 * that something happened while we were processing this
1644 * request, and it might be necessary to retry.
1645 */
1646 xug->xug_gen = unp_gencnt;
1647 xug->xug_sogen = so_gencnt;
1648 xug->xug_count = unp_count;
1649 error = SYSCTL_OUT(req, xug, sizeof *xug);
1650 }
1651 free(unp_list, M_TEMP);
1652 free(xug, M_TEMP);
1653 return (error);
1654 }
1655
1656 SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1657 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1658 "List of active local datagram sockets");
1659 SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1660 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1661 "List of active local stream sockets");
1662 SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1663 CTLTYPE_OPAQUE | CTLFLAG_RD,
1664 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1665 "List of active local seqpacket sockets");
1666
1667 static void
unp_shutdown(struct unpcb * unp)1668 unp_shutdown(struct unpcb *unp)
1669 {
1670 struct unpcb *unp2;
1671 struct socket *so;
1672
1673 UNP_LINK_WLOCK_ASSERT();
1674 UNP_PCB_LOCK_ASSERT(unp);
1675
1676 unp2 = unp->unp_conn;
1677 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1678 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1679 so = unp2->unp_socket;
1680 if (so != NULL)
1681 socantrcvmore(so);
1682 }
1683 }
1684
1685 static void
unp_drop(struct unpcb * unp,int errno)1686 unp_drop(struct unpcb *unp, int errno)
1687 {
1688 struct socket *so = unp->unp_socket;
1689 struct unpcb *unp2;
1690
1691 UNP_LINK_WLOCK_ASSERT();
1692 UNP_PCB_LOCK_ASSERT(unp);
1693
1694 so->so_error = errno;
1695 unp2 = unp->unp_conn;
1696 if (unp2 == NULL)
1697 return;
1698 UNP_PCB_LOCK(unp2);
1699 unp_disconnect(unp, unp2);
1700 UNP_PCB_UNLOCK(unp2);
1701 }
1702
1703 static void
unp_freerights(struct filedescent ** fdep,int fdcount)1704 unp_freerights(struct filedescent **fdep, int fdcount)
1705 {
1706 struct file *fp;
1707 int i;
1708
1709 KASSERT(fdcount > 0, ("%s: fdcount %d", __func__, fdcount));
1710
1711 for (i = 0; i < fdcount; i++) {
1712 fp = fdep[i]->fde_file;
1713 filecaps_free(&fdep[i]->fde_caps);
1714 unp_discard(fp);
1715 }
1716 free(fdep[0], M_FILECAPS);
1717 }
1718
1719 static int
unp_externalize(struct mbuf * control,struct mbuf ** controlp,int flags)1720 unp_externalize(struct mbuf *control, struct mbuf **controlp, int flags)
1721 {
1722 struct thread *td = curthread; /* XXX */
1723 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1724 int i;
1725 int *fdp;
1726 struct filedesc *fdesc = td->td_proc->p_fd;
1727 struct filedescent *fde, **fdep;
1728 void *data;
1729 socklen_t clen = control->m_len, datalen;
1730 int error, newfds;
1731 u_int newlen;
1732
1733 UNP_LINK_UNLOCK_ASSERT();
1734
1735 error = 0;
1736 if (controlp != NULL) /* controlp == NULL => free control messages */
1737 *controlp = NULL;
1738 while (cm != NULL) {
1739 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1740 error = EINVAL;
1741 break;
1742 }
1743 data = CMSG_DATA(cm);
1744 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1745 if (cm->cmsg_level == SOL_SOCKET
1746 && cm->cmsg_type == SCM_RIGHTS) {
1747 newfds = datalen / sizeof(*fdep);
1748 if (newfds == 0)
1749 goto next;
1750 fdep = data;
1751
1752 /* If we're not outputting the descriptors free them. */
1753 if (error || controlp == NULL) {
1754 unp_freerights(fdep, newfds);
1755 goto next;
1756 }
1757 FILEDESC_XLOCK(fdesc);
1758
1759 /*
1760 * Now change each pointer to an fd in the global
1761 * table to an integer that is the index to the local
1762 * fd table entry that we set up to point to the
1763 * global one we are transferring.
1764 */
1765 newlen = newfds * sizeof(int);
1766 *controlp = sbcreatecontrol(NULL, newlen,
1767 SCM_RIGHTS, SOL_SOCKET);
1768 if (*controlp == NULL) {
1769 FILEDESC_XUNLOCK(fdesc);
1770 error = E2BIG;
1771 unp_freerights(fdep, newfds);
1772 goto next;
1773 }
1774
1775 fdp = (int *)
1776 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1777 if (fdallocn(td, 0, fdp, newfds) != 0) {
1778 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1779 error = EMSGSIZE;
1780 unp_freerights(fdep, newfds);
1781 m_freem(*controlp);
1782 *controlp = NULL;
1783 goto next;
1784 }
1785 for (i = 0; i < newfds; i++, fdp++) {
1786 fde = &fdesc->fd_ofiles[*fdp];
1787 fde->fde_file = fdep[i]->fde_file;
1788 filecaps_move(&fdep[i]->fde_caps,
1789 &fde->fde_caps);
1790 if ((flags & MSG_CMSG_CLOEXEC) != 0)
1791 fde->fde_flags |= UF_EXCLOSE;
1792 unp_externalize_fp(fde->fde_file);
1793 }
1794 FILEDESC_XUNLOCK(fdesc);
1795 free(fdep[0], M_FILECAPS);
1796 } else {
1797 /* We can just copy anything else across. */
1798 if (error || controlp == NULL)
1799 goto next;
1800 *controlp = sbcreatecontrol(NULL, datalen,
1801 cm->cmsg_type, cm->cmsg_level);
1802 if (*controlp == NULL) {
1803 error = ENOBUFS;
1804 goto next;
1805 }
1806 bcopy(data,
1807 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1808 datalen);
1809 }
1810 controlp = &(*controlp)->m_next;
1811
1812 next:
1813 if (CMSG_SPACE(datalen) < clen) {
1814 clen -= CMSG_SPACE(datalen);
1815 cm = (struct cmsghdr *)
1816 ((caddr_t)cm + CMSG_SPACE(datalen));
1817 } else {
1818 clen = 0;
1819 cm = NULL;
1820 }
1821 }
1822
1823 m_freem(control);
1824 return (error);
1825 }
1826
1827 static void
unp_zone_change(void * tag)1828 unp_zone_change(void *tag)
1829 {
1830
1831 uma_zone_set_max(unp_zone, maxsockets);
1832 }
1833
1834 static void
unp_init(void)1835 unp_init(void)
1836 {
1837
1838 #ifdef VIMAGE
1839 if (!IS_DEFAULT_VNET(curvnet))
1840 return;
1841 #endif
1842 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1843 NULL, NULL, UMA_ALIGN_PTR, 0);
1844 if (unp_zone == NULL)
1845 panic("unp_init");
1846 uma_zone_set_max(unp_zone, maxsockets);
1847 uma_zone_set_warning(unp_zone, "kern.ipc.maxsockets limit reached");
1848 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1849 NULL, EVENTHANDLER_PRI_ANY);
1850 LIST_INIT(&unp_dhead);
1851 LIST_INIT(&unp_shead);
1852 LIST_INIT(&unp_sphead);
1853 SLIST_INIT(&unp_defers);
1854 TIMEOUT_TASK_INIT(taskqueue_thread, &unp_gc_task, 0, unp_gc, NULL);
1855 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1856 UNP_LINK_LOCK_INIT();
1857 UNP_LIST_LOCK_INIT();
1858 UNP_DEFERRED_LOCK_INIT();
1859 }
1860
1861 static int
unp_internalize(struct mbuf ** controlp,struct thread * td)1862 unp_internalize(struct mbuf **controlp, struct thread *td)
1863 {
1864 struct mbuf *control = *controlp;
1865 struct proc *p = td->td_proc;
1866 struct filedesc *fdesc = p->p_fd;
1867 struct bintime *bt;
1868 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1869 struct cmsgcred *cmcred;
1870 struct filedescent *fde, **fdep, *fdev;
1871 struct file *fp;
1872 struct timeval *tv;
1873 int i, *fdp;
1874 void *data;
1875 socklen_t clen = control->m_len, datalen;
1876 int error, oldfds;
1877 u_int newlen;
1878
1879 UNP_LINK_UNLOCK_ASSERT();
1880
1881 error = 0;
1882 *controlp = NULL;
1883 while (cm != NULL) {
1884 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1885 || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) {
1886 error = EINVAL;
1887 goto out;
1888 }
1889 data = CMSG_DATA(cm);
1890 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1891
1892 switch (cm->cmsg_type) {
1893 /*
1894 * Fill in credential information.
1895 */
1896 case SCM_CREDS:
1897 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1898 SCM_CREDS, SOL_SOCKET);
1899 if (*controlp == NULL) {
1900 error = ENOBUFS;
1901 goto out;
1902 }
1903 cmcred = (struct cmsgcred *)
1904 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1905 cmcred->cmcred_pid = p->p_pid;
1906 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1907 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1908 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1909 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1910 CMGROUP_MAX);
1911 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1912 cmcred->cmcred_groups[i] =
1913 td->td_ucred->cr_groups[i];
1914 break;
1915
1916 case SCM_RIGHTS:
1917 oldfds = datalen / sizeof (int);
1918 if (oldfds == 0)
1919 break;
1920 /*
1921 * Check that all the FDs passed in refer to legal
1922 * files. If not, reject the entire operation.
1923 */
1924 fdp = data;
1925 FILEDESC_SLOCK(fdesc);
1926 for (i = 0; i < oldfds; i++, fdp++) {
1927 fp = fget_locked(fdesc, *fdp);
1928 if (fp == NULL) {
1929 FILEDESC_SUNLOCK(fdesc);
1930 error = EBADF;
1931 goto out;
1932 }
1933 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1934 FILEDESC_SUNLOCK(fdesc);
1935 error = EOPNOTSUPP;
1936 goto out;
1937 }
1938
1939 }
1940
1941 /*
1942 * Now replace the integer FDs with pointers to the
1943 * file structure and capability rights.
1944 */
1945 newlen = oldfds * sizeof(fdep[0]);
1946 *controlp = sbcreatecontrol(NULL, newlen,
1947 SCM_RIGHTS, SOL_SOCKET);
1948 if (*controlp == NULL) {
1949 FILEDESC_SUNLOCK(fdesc);
1950 error = E2BIG;
1951 goto out;
1952 }
1953 fdp = data;
1954 fdep = (struct filedescent **)
1955 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1956 fdev = malloc(sizeof(*fdev) * oldfds, M_FILECAPS,
1957 M_WAITOK);
1958 for (i = 0; i < oldfds; i++, fdev++, fdp++) {
1959 fde = &fdesc->fd_ofiles[*fdp];
1960 fdep[i] = fdev;
1961 fdep[i]->fde_file = fde->fde_file;
1962 filecaps_copy(&fde->fde_caps,
1963 &fdep[i]->fde_caps);
1964 unp_internalize_fp(fdep[i]->fde_file);
1965 }
1966 FILEDESC_SUNLOCK(fdesc);
1967 break;
1968
1969 case SCM_TIMESTAMP:
1970 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1971 SCM_TIMESTAMP, SOL_SOCKET);
1972 if (*controlp == NULL) {
1973 error = ENOBUFS;
1974 goto out;
1975 }
1976 tv = (struct timeval *)
1977 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1978 microtime(tv);
1979 break;
1980
1981 case SCM_BINTIME:
1982 *controlp = sbcreatecontrol(NULL, sizeof(*bt),
1983 SCM_BINTIME, SOL_SOCKET);
1984 if (*controlp == NULL) {
1985 error = ENOBUFS;
1986 goto out;
1987 }
1988 bt = (struct bintime *)
1989 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1990 bintime(bt);
1991 break;
1992
1993 default:
1994 error = EINVAL;
1995 goto out;
1996 }
1997
1998 controlp = &(*controlp)->m_next;
1999 if (CMSG_SPACE(datalen) < clen) {
2000 clen -= CMSG_SPACE(datalen);
2001 cm = (struct cmsghdr *)
2002 ((caddr_t)cm + CMSG_SPACE(datalen));
2003 } else {
2004 clen = 0;
2005 cm = NULL;
2006 }
2007 }
2008
2009 out:
2010 m_freem(control);
2011 return (error);
2012 }
2013
2014 static struct mbuf *
unp_addsockcred(struct thread * td,struct mbuf * control)2015 unp_addsockcred(struct thread *td, struct mbuf *control)
2016 {
2017 struct mbuf *m, *n, *n_prev;
2018 struct sockcred *sc;
2019 const struct cmsghdr *cm;
2020 int ngroups;
2021 int i;
2022
2023 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
2024 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
2025 if (m == NULL)
2026 return (control);
2027
2028 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
2029 sc->sc_uid = td->td_ucred->cr_ruid;
2030 sc->sc_euid = td->td_ucred->cr_uid;
2031 sc->sc_gid = td->td_ucred->cr_rgid;
2032 sc->sc_egid = td->td_ucred->cr_gid;
2033 sc->sc_ngroups = ngroups;
2034 for (i = 0; i < sc->sc_ngroups; i++)
2035 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
2036
2037 /*
2038 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
2039 * created SCM_CREDS control message (struct sockcred) has another
2040 * format.
2041 */
2042 if (control != NULL)
2043 for (n = control, n_prev = NULL; n != NULL;) {
2044 cm = mtod(n, struct cmsghdr *);
2045 if (cm->cmsg_level == SOL_SOCKET &&
2046 cm->cmsg_type == SCM_CREDS) {
2047 if (n_prev == NULL)
2048 control = n->m_next;
2049 else
2050 n_prev->m_next = n->m_next;
2051 n = m_free(n);
2052 } else {
2053 n_prev = n;
2054 n = n->m_next;
2055 }
2056 }
2057
2058 /* Prepend it to the head. */
2059 m->m_next = control;
2060 return (m);
2061 }
2062
2063 static struct unpcb *
fptounp(struct file * fp)2064 fptounp(struct file *fp)
2065 {
2066 struct socket *so;
2067
2068 if (fp->f_type != DTYPE_SOCKET)
2069 return (NULL);
2070 if ((so = fp->f_data) == NULL)
2071 return (NULL);
2072 if (so->so_proto->pr_domain != &localdomain)
2073 return (NULL);
2074 return sotounpcb(so);
2075 }
2076
2077 static void
unp_discard(struct file * fp)2078 unp_discard(struct file *fp)
2079 {
2080 struct unp_defer *dr;
2081
2082 if (unp_externalize_fp(fp)) {
2083 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2084 dr->ud_fp = fp;
2085 UNP_DEFERRED_LOCK();
2086 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2087 UNP_DEFERRED_UNLOCK();
2088 atomic_add_int(&unp_defers_count, 1);
2089 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2090 } else
2091 (void) closef(fp, (struct thread *)NULL);
2092 }
2093
2094 static void
unp_process_defers(void * arg __unused,int pending)2095 unp_process_defers(void *arg __unused, int pending)
2096 {
2097 struct unp_defer *dr;
2098 SLIST_HEAD(, unp_defer) drl;
2099 int count;
2100
2101 SLIST_INIT(&drl);
2102 for (;;) {
2103 UNP_DEFERRED_LOCK();
2104 if (SLIST_FIRST(&unp_defers) == NULL) {
2105 UNP_DEFERRED_UNLOCK();
2106 break;
2107 }
2108 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2109 UNP_DEFERRED_UNLOCK();
2110 count = 0;
2111 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2112 SLIST_REMOVE_HEAD(&drl, ud_link);
2113 closef(dr->ud_fp, NULL);
2114 free(dr, M_TEMP);
2115 count++;
2116 }
2117 atomic_add_int(&unp_defers_count, -count);
2118 }
2119 }
2120
2121 static void
unp_internalize_fp(struct file * fp)2122 unp_internalize_fp(struct file *fp)
2123 {
2124 struct unpcb *unp;
2125
2126 UNP_LINK_WLOCK();
2127 if ((unp = fptounp(fp)) != NULL) {
2128 unp->unp_file = fp;
2129 unp->unp_msgcount++;
2130 }
2131 fhold(fp);
2132 unp_rights++;
2133 UNP_LINK_WUNLOCK();
2134 }
2135
2136 static int
unp_externalize_fp(struct file * fp)2137 unp_externalize_fp(struct file *fp)
2138 {
2139 struct unpcb *unp;
2140 int ret;
2141
2142 UNP_LINK_WLOCK();
2143 if ((unp = fptounp(fp)) != NULL) {
2144 unp->unp_msgcount--;
2145 ret = 1;
2146 } else
2147 ret = 0;
2148 unp_rights--;
2149 UNP_LINK_WUNLOCK();
2150 return (ret);
2151 }
2152
2153 /*
2154 * unp_defer indicates whether additional work has been defered for a future
2155 * pass through unp_gc(). It is thread local and does not require explicit
2156 * synchronization.
2157 */
2158 static int unp_marked;
2159 static int unp_unreachable;
2160
2161 static void
unp_accessable(struct filedescent ** fdep,int fdcount)2162 unp_accessable(struct filedescent **fdep, int fdcount)
2163 {
2164 struct unpcb *unp;
2165 struct file *fp;
2166 int i;
2167
2168 for (i = 0; i < fdcount; i++) {
2169 fp = fdep[i]->fde_file;
2170 if ((unp = fptounp(fp)) == NULL)
2171 continue;
2172 if (unp->unp_gcflag & UNPGC_REF)
2173 continue;
2174 unp->unp_gcflag &= ~UNPGC_DEAD;
2175 unp->unp_gcflag |= UNPGC_REF;
2176 unp_marked++;
2177 }
2178 }
2179
2180 static void
unp_gc_process(struct unpcb * unp)2181 unp_gc_process(struct unpcb *unp)
2182 {
2183 struct socket *soa;
2184 struct socket *so;
2185 struct file *fp;
2186
2187 /* Already processed. */
2188 if (unp->unp_gcflag & UNPGC_SCANNED)
2189 return;
2190 fp = unp->unp_file;
2191
2192 /*
2193 * Check for a socket potentially in a cycle. It must be in a
2194 * queue as indicated by msgcount, and this must equal the file
2195 * reference count. Note that when msgcount is 0 the file is NULL.
2196 */
2197 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2198 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2199 unp->unp_gcflag |= UNPGC_DEAD;
2200 unp_unreachable++;
2201 return;
2202 }
2203
2204 /*
2205 * Mark all sockets we reference with RIGHTS.
2206 */
2207 so = unp->unp_socket;
2208 if ((unp->unp_gcflag & UNPGC_IGNORE_RIGHTS) == 0) {
2209 SOCKBUF_LOCK(&so->so_rcv);
2210 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2211 SOCKBUF_UNLOCK(&so->so_rcv);
2212 }
2213
2214 /*
2215 * Mark all sockets in our accept queue.
2216 */
2217 ACCEPT_LOCK();
2218 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2219 if ((sotounpcb(soa)->unp_gcflag & UNPGC_IGNORE_RIGHTS) != 0)
2220 continue;
2221 SOCKBUF_LOCK(&soa->so_rcv);
2222 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2223 SOCKBUF_UNLOCK(&soa->so_rcv);
2224 }
2225 ACCEPT_UNLOCK();
2226 unp->unp_gcflag |= UNPGC_SCANNED;
2227 }
2228
2229 static int unp_recycled;
2230 SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2231 "Number of unreachable sockets claimed by the garbage collector.");
2232
2233 static int unp_taskcount;
2234 SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2235 "Number of times the garbage collector has run.");
2236
2237 static void
unp_gc(__unused void * arg,int pending)2238 unp_gc(__unused void *arg, int pending)
2239 {
2240 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2241 NULL };
2242 struct unp_head **head;
2243 struct file *f, **unref;
2244 struct unpcb *unp;
2245 int i, total;
2246
2247 unp_taskcount++;
2248 UNP_LIST_LOCK();
2249 /*
2250 * First clear all gc flags from previous runs, apart from
2251 * UNPGC_IGNORE_RIGHTS.
2252 */
2253 for (head = heads; *head != NULL; head++)
2254 LIST_FOREACH(unp, *head, unp_link)
2255 unp->unp_gcflag =
2256 (unp->unp_gcflag & UNPGC_IGNORE_RIGHTS);
2257
2258 /*
2259 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2260 * is reachable all of the sockets it references are reachable.
2261 * Stop the scan once we do a complete loop without discovering
2262 * a new reachable socket.
2263 */
2264 do {
2265 unp_unreachable = 0;
2266 unp_marked = 0;
2267 for (head = heads; *head != NULL; head++)
2268 LIST_FOREACH(unp, *head, unp_link)
2269 unp_gc_process(unp);
2270 } while (unp_marked);
2271 UNP_LIST_UNLOCK();
2272 if (unp_unreachable == 0)
2273 return;
2274
2275 /*
2276 * Allocate space for a local list of dead unpcbs.
2277 */
2278 unref = malloc(unp_unreachable * sizeof(struct file *),
2279 M_TEMP, M_WAITOK);
2280
2281 /*
2282 * Iterate looking for sockets which have been specifically marked
2283 * as as unreachable and store them locally.
2284 */
2285 UNP_LINK_RLOCK();
2286 UNP_LIST_LOCK();
2287 for (total = 0, head = heads; *head != NULL; head++)
2288 LIST_FOREACH(unp, *head, unp_link)
2289 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2290 f = unp->unp_file;
2291 if (unp->unp_msgcount == 0 || f == NULL ||
2292 f->f_count != unp->unp_msgcount)
2293 continue;
2294 unref[total++] = f;
2295 fhold(f);
2296 KASSERT(total <= unp_unreachable,
2297 ("unp_gc: incorrect unreachable count."));
2298 }
2299 UNP_LIST_UNLOCK();
2300 UNP_LINK_RUNLOCK();
2301
2302 /*
2303 * Now flush all sockets, free'ing rights. This will free the
2304 * struct files associated with these sockets but leave each socket
2305 * with one remaining ref.
2306 */
2307 for (i = 0; i < total; i++) {
2308 struct socket *so;
2309
2310 so = unref[i]->f_data;
2311 CURVNET_SET(so->so_vnet);
2312 sorflush(so);
2313 CURVNET_RESTORE();
2314 }
2315
2316 /*
2317 * And finally release the sockets so they can be reclaimed.
2318 */
2319 for (i = 0; i < total; i++)
2320 fdrop(unref[i], NULL);
2321 unp_recycled += total;
2322 free(unref, M_TEMP);
2323 }
2324
2325 static void
unp_dispose(struct mbuf * m)2326 unp_dispose(struct mbuf *m)
2327 {
2328
2329 if (m)
2330 unp_scan(m, unp_freerights);
2331 }
2332
2333 /*
2334 * Synchronize against unp_gc, which can trip over data as we are freeing it.
2335 */
2336 void
unp_dispose_so(struct socket * so)2337 unp_dispose_so(struct socket *so)
2338 {
2339 struct unpcb *unp;
2340
2341 unp = sotounpcb(so);
2342 UNP_LIST_LOCK();
2343 unp->unp_gcflag |= UNPGC_IGNORE_RIGHTS;
2344 UNP_LIST_UNLOCK();
2345 unp_dispose(so->so_rcv.sb_mb);
2346 }
2347
2348 static void
unp_scan(struct mbuf * m0,void (* op)(struct filedescent **,int))2349 unp_scan(struct mbuf *m0, void (*op)(struct filedescent **, int))
2350 {
2351 struct mbuf *m;
2352 struct cmsghdr *cm;
2353 void *data;
2354 socklen_t clen, datalen;
2355
2356 while (m0 != NULL) {
2357 for (m = m0; m; m = m->m_next) {
2358 if (m->m_type != MT_CONTROL)
2359 continue;
2360
2361 cm = mtod(m, struct cmsghdr *);
2362 clen = m->m_len;
2363
2364 while (cm != NULL) {
2365 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2366 break;
2367
2368 data = CMSG_DATA(cm);
2369 datalen = (caddr_t)cm + cm->cmsg_len
2370 - (caddr_t)data;
2371
2372 if (cm->cmsg_level == SOL_SOCKET &&
2373 cm->cmsg_type == SCM_RIGHTS) {
2374 (*op)(data, datalen /
2375 sizeof(struct filedescent *));
2376 }
2377
2378 if (CMSG_SPACE(datalen) < clen) {
2379 clen -= CMSG_SPACE(datalen);
2380 cm = (struct cmsghdr *)
2381 ((caddr_t)cm + CMSG_SPACE(datalen));
2382 } else {
2383 clen = 0;
2384 cm = NULL;
2385 }
2386 }
2387 }
2388 m0 = m0->m_nextpkt;
2389 }
2390 }
2391
2392 /*
2393 * A helper function called by VFS before socket-type vnode reclamation.
2394 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2395 * use count.
2396 */
2397 void
vfs_unp_reclaim(struct vnode * vp)2398 vfs_unp_reclaim(struct vnode *vp)
2399 {
2400 struct socket *so;
2401 struct unpcb *unp;
2402 int active;
2403
2404 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2405 KASSERT(vp->v_type == VSOCK,
2406 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2407
2408 active = 0;
2409 UNP_LINK_WLOCK();
2410 VOP_UNP_CONNECT(vp, &so);
2411 if (so == NULL)
2412 goto done;
2413 unp = sotounpcb(so);
2414 if (unp == NULL)
2415 goto done;
2416 UNP_PCB_LOCK(unp);
2417 if (unp->unp_vnode == vp) {
2418 VOP_UNP_DETACH(vp);
2419 unp->unp_vnode = NULL;
2420 active = 1;
2421 }
2422 UNP_PCB_UNLOCK(unp);
2423 done:
2424 UNP_LINK_WUNLOCK();
2425 if (active)
2426 vunref(vp);
2427 }
2428
2429 #ifdef DDB
2430 static void
db_print_indent(int indent)2431 db_print_indent(int indent)
2432 {
2433 int i;
2434
2435 for (i = 0; i < indent; i++)
2436 db_printf(" ");
2437 }
2438
2439 static void
db_print_unpflags(int unp_flags)2440 db_print_unpflags(int unp_flags)
2441 {
2442 int comma;
2443
2444 comma = 0;
2445 if (unp_flags & UNP_HAVEPC) {
2446 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2447 comma = 1;
2448 }
2449 if (unp_flags & UNP_HAVEPCCACHED) {
2450 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2451 comma = 1;
2452 }
2453 if (unp_flags & UNP_WANTCRED) {
2454 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2455 comma = 1;
2456 }
2457 if (unp_flags & UNP_CONNWAIT) {
2458 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2459 comma = 1;
2460 }
2461 if (unp_flags & UNP_CONNECTING) {
2462 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2463 comma = 1;
2464 }
2465 if (unp_flags & UNP_BINDING) {
2466 db_printf("%sUNP_BINDING", comma ? ", " : "");
2467 comma = 1;
2468 }
2469 }
2470
2471 static void
db_print_xucred(int indent,struct xucred * xu)2472 db_print_xucred(int indent, struct xucred *xu)
2473 {
2474 int comma, i;
2475
2476 db_print_indent(indent);
2477 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2478 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2479 db_print_indent(indent);
2480 db_printf("cr_groups: ");
2481 comma = 0;
2482 for (i = 0; i < xu->cr_ngroups; i++) {
2483 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2484 comma = 1;
2485 }
2486 db_printf("\n");
2487 }
2488
2489 static void
db_print_unprefs(int indent,struct unp_head * uh)2490 db_print_unprefs(int indent, struct unp_head *uh)
2491 {
2492 struct unpcb *unp;
2493 int counter;
2494
2495 counter = 0;
2496 LIST_FOREACH(unp, uh, unp_reflink) {
2497 if (counter % 4 == 0)
2498 db_print_indent(indent);
2499 db_printf("%p ", unp);
2500 if (counter % 4 == 3)
2501 db_printf("\n");
2502 counter++;
2503 }
2504 if (counter != 0 && counter % 4 != 0)
2505 db_printf("\n");
2506 }
2507
DB_SHOW_COMMAND(unpcb,db_show_unpcb)2508 DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2509 {
2510 struct unpcb *unp;
2511
2512 if (!have_addr) {
2513 db_printf("usage: show unpcb <addr>\n");
2514 return;
2515 }
2516 unp = (struct unpcb *)addr;
2517
2518 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2519 unp->unp_vnode);
2520
2521 db_printf("unp_ino: %ju unp_conn: %p\n", (uintmax_t)unp->unp_ino,
2522 unp->unp_conn);
2523
2524 db_printf("unp_refs:\n");
2525 db_print_unprefs(2, &unp->unp_refs);
2526
2527 /* XXXRW: Would be nice to print the full address, if any. */
2528 db_printf("unp_addr: %p\n", unp->unp_addr);
2529
2530 db_printf("unp_gencnt: %llu\n",
2531 (unsigned long long)unp->unp_gencnt);
2532
2533 db_printf("unp_flags: %x (", unp->unp_flags);
2534 db_print_unpflags(unp->unp_flags);
2535 db_printf(")\n");
2536
2537 db_printf("unp_peercred:\n");
2538 db_print_xucred(2, &unp->unp_peercred);
2539
2540 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2541 }
2542 #endif
2543