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 * distinguish datagram size limits from flow control limits in SEQPACKET
55 * rethink name space problems
56 * need a proper out-of-band
57 */
58
59#include <sys/cdefs.h>
| 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 * distinguish datagram size limits from flow control limits in SEQPACKET
55 * rethink name space problems
56 * need a proper out-of-band
57 */
58
59#include <sys/cdefs.h>
|
60__FBSDID("$FreeBSD: head/sys/kern/uipc_usrreq.c 232152 2012-02-25 10:15:41Z trociny $");
| 60__FBSDID("$FreeBSD: head/sys/kern/uipc_usrreq.c 232317 2012-02-29 21:38:31Z trociny $");
|
61
62#include "opt_ddb.h"
63
64#include <sys/param.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/*
105 * Locking key:
106 * (l) Locked using list lock
107 * (g) Locked using linkage lock
108 */
109
110static uma_zone_t unp_zone;
111static unp_gen_t unp_gencnt; /* (l) */
112static u_int unp_count; /* (l) Count of local sockets. */
113static ino_t unp_ino; /* Prototype for fake inode numbers. */
114static int unp_rights; /* (g) File descriptors in flight. */
115static struct unp_head unp_shead; /* (l) List of stream sockets. */
116static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
117static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
118
119struct unp_defer {
120 SLIST_ENTRY(unp_defer) ud_link;
121 struct file *ud_fp;
122};
123static SLIST_HEAD(, unp_defer) unp_defers;
124static int unp_defers_count;
125
126static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
127
128/*
129 * Garbage collection of cyclic file descriptor/socket references occurs
130 * asynchronously in a taskqueue context in order to avoid recursion and
131 * reentrance in the UNIX domain socket, file descriptor, and socket layer
132 * code. See unp_gc() for a full description.
133 */
134static struct task unp_gc_task;
135
136/*
137 * The close of unix domain sockets attached as SCM_RIGHTS is
138 * postponed to the taskqueue, to avoid arbitrary recursion depth.
139 * The attached sockets might have another sockets attached.
140 */
141static struct task unp_defer_task;
142
143/*
144 * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
145 * stream sockets, although the total for sender and receiver is actually
146 * only PIPSIZ.
147 *
148 * Datagram sockets really use the sendspace as the maximum datagram size,
149 * and don't really want to reserve the sendspace. Their recvspace should be
150 * large enough for at least one max-size datagram plus address.
151 */
152#ifndef PIPSIZ
153#define PIPSIZ 8192
154#endif
155static u_long unpst_sendspace = PIPSIZ;
156static u_long unpst_recvspace = PIPSIZ;
157static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
158static u_long unpdg_recvspace = 4*1024;
159static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
160static u_long unpsp_recvspace = PIPSIZ;
161
162static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
163static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
164 "SOCK_STREAM");
165static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
166static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
167 "SOCK_SEQPACKET");
168
169SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
170 &unpst_sendspace, 0, "Default stream send space.");
171SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
172 &unpst_recvspace, 0, "Default stream receive space.");
173SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
174 &unpdg_sendspace, 0, "Default datagram send space.");
175SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
176 &unpdg_recvspace, 0, "Default datagram receive space.");
177SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
178 &unpsp_sendspace, 0, "Default seqpacket send space.");
179SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
180 &unpsp_recvspace, 0, "Default seqpacket receive space.");
181SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
182 "File descriptors in flight.");
183SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
184 &unp_defers_count, 0,
185 "File descriptors deferred to taskqueue for close.");
186
187/*
188 * Locking and synchronization:
189 *
190 * Three types of locks exit in the local domain socket implementation: a
191 * global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the
192 * global locks, the list lock protects the socket count, global generation
193 * number, and stream/datagram global lists. The linkage lock protects the
194 * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
195 * held exclusively over the acquisition of multiple unpcb locks to prevent
196 * deadlock.
197 *
198 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
199 * allocated in pru_attach() and freed in pru_detach(). The validity of that
200 * pointer is an invariant, so no lock is required to dereference the so_pcb
201 * pointer if a valid socket reference is held by the caller. In practice,
202 * this is always true during operations performed on a socket. Each unpcb
203 * has a back-pointer to its socket, unp_socket, which will be stable under
204 * the same circumstances.
205 *
206 * This pointer may only be safely dereferenced as long as a valid reference
207 * to the unpcb is held. Typically, this reference will be from the socket,
208 * or from another unpcb when the referring unpcb's lock is held (in order
209 * that the reference not be invalidated during use). For example, to follow
210 * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
211 * as unp_socket remains valid as long as the reference to unp_conn is valid.
212 *
213 * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
214 * atomic reads without the lock may be performed "lockless", but more
215 * complex reads and read-modify-writes require the mutex to be held. No
216 * lock order is defined between unpcb locks -- multiple unpcb locks may be
217 * acquired at the same time only when holding the linkage rwlock
218 * exclusively, which prevents deadlocks.
219 *
220 * Blocking with UNIX domain sockets is a tricky issue: unlike most network
221 * protocols, bind() is a non-atomic operation, and connect() requires
222 * potential sleeping in the protocol, due to potentially waiting on local or
223 * distributed file systems. We try to separate "lookup" operations, which
224 * may sleep, and the IPC operations themselves, which typically can occur
225 * with relative atomicity as locks can be held over the entire operation.
226 *
227 * Another tricky issue is simultaneous multi-threaded or multi-process
228 * access to a single UNIX domain socket. These are handled by the flags
229 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
230 * binding, both of which involve dropping UNIX domain socket locks in order
231 * to perform namei() and other file system operations.
232 */
233static struct rwlock unp_link_rwlock;
234static struct mtx unp_list_lock;
235static struct mtx unp_defers_lock;
236
237#define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
238 "unp_link_rwlock")
239
240#define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
241 RA_LOCKED)
242#define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
243 RA_UNLOCKED)
244
245#define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
246#define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
247#define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
248#define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
249#define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
250 RA_WLOCKED)
251
252#define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \
253 "unp_list_lock", NULL, MTX_DEF)
254#define UNP_LIST_LOCK() mtx_lock(&unp_list_lock)
255#define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock)
256
257#define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
258 "unp_defer", NULL, MTX_DEF)
259#define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
260#define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
261
262#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
263 "unp_mtx", "unp_mtx", \
264 MTX_DUPOK|MTX_DEF|MTX_RECURSE)
265#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
266#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
267#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
268#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
269
270static int uipc_connect2(struct socket *, struct socket *);
271static int uipc_ctloutput(struct socket *, struct sockopt *);
272static int unp_connect(struct socket *, struct sockaddr *,
273 struct thread *);
274static int unp_connect2(struct socket *so, struct socket *so2, int);
275static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
276static void unp_dispose(struct mbuf *);
277static void unp_shutdown(struct unpcb *);
278static void unp_drop(struct unpcb *, int);
279static void unp_gc(__unused void *, int);
280static void unp_scan(struct mbuf *, void (*)(struct file *));
281static void unp_discard(struct file *);
282static void unp_freerights(struct file **, int);
283static void unp_init(void);
284static int unp_internalize(struct mbuf **, struct thread *);
285static void unp_internalize_fp(struct file *);
286static int unp_externalize(struct mbuf *, struct mbuf **);
287static int unp_externalize_fp(struct file *);
288static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
289static void unp_process_defers(void * __unused, int);
290
291/*
292 * Definitions of protocols supported in the LOCAL domain.
293 */
294static struct domain localdomain;
295static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
296static struct pr_usrreqs uipc_usrreqs_seqpacket;
297static struct protosw localsw[] = {
298{
299 .pr_type = SOCK_STREAM,
300 .pr_domain = &localdomain,
301 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
302 .pr_ctloutput = &uipc_ctloutput,
303 .pr_usrreqs = &uipc_usrreqs_stream
304},
305{
306 .pr_type = SOCK_DGRAM,
307 .pr_domain = &localdomain,
308 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
309 .pr_usrreqs = &uipc_usrreqs_dgram
310},
311{
312 .pr_type = SOCK_SEQPACKET,
313 .pr_domain = &localdomain,
314
315 /*
316 * XXXRW: For now, PR_ADDR because soreceive will bump into them
317 * due to our use of sbappendaddr. A new sbappend variants is needed
318 * that supports both atomic record writes and control data.
319 */
320 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
321 PR_RIGHTS,
322 .pr_usrreqs = &uipc_usrreqs_seqpacket,
323},
324};
325
326static struct domain localdomain = {
327 .dom_family = AF_LOCAL,
328 .dom_name = "local",
329 .dom_init = unp_init,
330 .dom_externalize = unp_externalize,
331 .dom_dispose = unp_dispose,
332 .dom_protosw = localsw,
333 .dom_protoswNPROTOSW = &localsw[sizeof(localsw)/sizeof(localsw[0])]
334};
335DOMAIN_SET(local);
336
337static void
338uipc_abort(struct socket *so)
339{
340 struct unpcb *unp, *unp2;
341
342 unp = sotounpcb(so);
343 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
344
345 UNP_LINK_WLOCK();
346 UNP_PCB_LOCK(unp);
347 unp2 = unp->unp_conn;
348 if (unp2 != NULL) {
349 UNP_PCB_LOCK(unp2);
350 unp_drop(unp2, ECONNABORTED);
351 UNP_PCB_UNLOCK(unp2);
352 }
353 UNP_PCB_UNLOCK(unp);
354 UNP_LINK_WUNLOCK();
355}
356
357static int
358uipc_accept(struct socket *so, struct sockaddr **nam)
359{
360 struct unpcb *unp, *unp2;
361 const struct sockaddr *sa;
362
363 /*
364 * Pass back name of connected socket, if it was bound and we are
365 * still connected (our peer may have closed already!).
366 */
367 unp = sotounpcb(so);
368 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
369
370 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
371 UNP_LINK_RLOCK();
372 unp2 = unp->unp_conn;
373 if (unp2 != NULL && unp2->unp_addr != NULL) {
374 UNP_PCB_LOCK(unp2);
375 sa = (struct sockaddr *) unp2->unp_addr;
376 bcopy(sa, *nam, sa->sa_len);
377 UNP_PCB_UNLOCK(unp2);
378 } else {
379 sa = &sun_noname;
380 bcopy(sa, *nam, sa->sa_len);
381 }
382 UNP_LINK_RUNLOCK();
383 return (0);
384}
385
386static int
387uipc_attach(struct socket *so, int proto, struct thread *td)
388{
389 u_long sendspace, recvspace;
390 struct unpcb *unp;
391 int error;
392
393 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
394 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
395 switch (so->so_type) {
396 case SOCK_STREAM:
397 sendspace = unpst_sendspace;
398 recvspace = unpst_recvspace;
399 break;
400
401 case SOCK_DGRAM:
402 sendspace = unpdg_sendspace;
403 recvspace = unpdg_recvspace;
404 break;
405
406 case SOCK_SEQPACKET:
407 sendspace = unpsp_sendspace;
408 recvspace = unpsp_recvspace;
409 break;
410
411 default:
412 panic("uipc_attach");
413 }
414 error = soreserve(so, sendspace, recvspace);
415 if (error)
416 return (error);
417 }
418 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
419 if (unp == NULL)
420 return (ENOBUFS);
421 LIST_INIT(&unp->unp_refs);
422 UNP_PCB_LOCK_INIT(unp);
423 unp->unp_socket = so;
424 so->so_pcb = unp;
425 unp->unp_refcount = 1;
426
427 UNP_LIST_LOCK();
428 unp->unp_gencnt = ++unp_gencnt;
429 unp_count++;
430 switch (so->so_type) {
431 case SOCK_STREAM:
432 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
433 break;
434
435 case SOCK_DGRAM:
436 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
437 break;
438
439 case SOCK_SEQPACKET:
440 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
441 break;
442
443 default:
444 panic("uipc_attach");
445 }
446 UNP_LIST_UNLOCK();
447
448 return (0);
449}
450
451static int
452uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
453{
454 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
455 struct vattr vattr;
456 int error, namelen, vfslocked;
457 struct nameidata nd;
458 struct unpcb *unp;
459 struct vnode *vp;
460 struct mount *mp;
461 char *buf;
462
463 unp = sotounpcb(so);
464 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
465
466 if (soun->sun_len > sizeof(struct sockaddr_un))
467 return (EINVAL);
468 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
469 if (namelen <= 0)
470 return (EINVAL);
471
472 /*
473 * We don't allow simultaneous bind() calls on a single UNIX domain
474 * socket, so flag in-progress operations, and return an error if an
475 * operation is already in progress.
476 *
477 * Historically, we have not allowed a socket to be rebound, so this
478 * also returns an error. Not allowing re-binding simplifies the
479 * implementation and avoids a great many possible failure modes.
480 */
481 UNP_PCB_LOCK(unp);
482 if (unp->unp_vnode != NULL) {
483 UNP_PCB_UNLOCK(unp);
484 return (EINVAL);
485 }
486 if (unp->unp_flags & UNP_BINDING) {
487 UNP_PCB_UNLOCK(unp);
488 return (EALREADY);
489 }
490 unp->unp_flags |= UNP_BINDING;
491 UNP_PCB_UNLOCK(unp);
492
493 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
494 bcopy(soun->sun_path, buf, namelen);
495 buf[namelen] = 0;
496
497restart:
498 vfslocked = 0;
499 NDINIT(&nd, CREATE, MPSAFE | NOFOLLOW | LOCKPARENT | SAVENAME,
500 UIO_SYSSPACE, buf, td);
501/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
502 error = namei(&nd);
503 if (error)
504 goto error;
505 vp = nd.ni_vp;
506 vfslocked = NDHASGIANT(&nd);
507 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
508 NDFREE(&nd, NDF_ONLY_PNBUF);
509 if (nd.ni_dvp == vp)
510 vrele(nd.ni_dvp);
511 else
512 vput(nd.ni_dvp);
513 if (vp != NULL) {
514 vrele(vp);
515 error = EADDRINUSE;
516 goto error;
517 }
518 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
519 if (error)
520 goto error;
521 VFS_UNLOCK_GIANT(vfslocked);
522 goto restart;
523 }
524 VATTR_NULL(&vattr);
525 vattr.va_type = VSOCK;
526 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
527#ifdef MAC
528 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
529 &vattr);
530#endif
531 if (error == 0)
532 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
533 NDFREE(&nd, NDF_ONLY_PNBUF);
534 vput(nd.ni_dvp);
535 if (error) {
536 vn_finished_write(mp);
537 goto error;
538 }
539 vp = nd.ni_vp;
540 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
541 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
542
543 UNP_LINK_WLOCK();
544 UNP_PCB_LOCK(unp);
| 61
62#include "opt_ddb.h"
63
64#include <sys/param.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/*
105 * Locking key:
106 * (l) Locked using list lock
107 * (g) Locked using linkage lock
108 */
109
110static uma_zone_t unp_zone;
111static unp_gen_t unp_gencnt; /* (l) */
112static u_int unp_count; /* (l) Count of local sockets. */
113static ino_t unp_ino; /* Prototype for fake inode numbers. */
114static int unp_rights; /* (g) File descriptors in flight. */
115static struct unp_head unp_shead; /* (l) List of stream sockets. */
116static struct unp_head unp_dhead; /* (l) List of datagram sockets. */
117static struct unp_head unp_sphead; /* (l) List of seqpacket sockets. */
118
119struct unp_defer {
120 SLIST_ENTRY(unp_defer) ud_link;
121 struct file *ud_fp;
122};
123static SLIST_HEAD(, unp_defer) unp_defers;
124static int unp_defers_count;
125
126static const struct sockaddr sun_noname = { sizeof(sun_noname), AF_LOCAL };
127
128/*
129 * Garbage collection of cyclic file descriptor/socket references occurs
130 * asynchronously in a taskqueue context in order to avoid recursion and
131 * reentrance in the UNIX domain socket, file descriptor, and socket layer
132 * code. See unp_gc() for a full description.
133 */
134static struct task unp_gc_task;
135
136/*
137 * The close of unix domain sockets attached as SCM_RIGHTS is
138 * postponed to the taskqueue, to avoid arbitrary recursion depth.
139 * The attached sockets might have another sockets attached.
140 */
141static struct task unp_defer_task;
142
143/*
144 * Both send and receive buffers are allocated PIPSIZ bytes of buffering for
145 * stream sockets, although the total for sender and receiver is actually
146 * only PIPSIZ.
147 *
148 * Datagram sockets really use the sendspace as the maximum datagram size,
149 * and don't really want to reserve the sendspace. Their recvspace should be
150 * large enough for at least one max-size datagram plus address.
151 */
152#ifndef PIPSIZ
153#define PIPSIZ 8192
154#endif
155static u_long unpst_sendspace = PIPSIZ;
156static u_long unpst_recvspace = PIPSIZ;
157static u_long unpdg_sendspace = 2*1024; /* really max datagram size */
158static u_long unpdg_recvspace = 4*1024;
159static u_long unpsp_sendspace = PIPSIZ; /* really max datagram size */
160static u_long unpsp_recvspace = PIPSIZ;
161
162static SYSCTL_NODE(_net, PF_LOCAL, local, CTLFLAG_RW, 0, "Local domain");
163static SYSCTL_NODE(_net_local, SOCK_STREAM, stream, CTLFLAG_RW, 0,
164 "SOCK_STREAM");
165static SYSCTL_NODE(_net_local, SOCK_DGRAM, dgram, CTLFLAG_RW, 0, "SOCK_DGRAM");
166static SYSCTL_NODE(_net_local, SOCK_SEQPACKET, seqpacket, CTLFLAG_RW, 0,
167 "SOCK_SEQPACKET");
168
169SYSCTL_ULONG(_net_local_stream, OID_AUTO, sendspace, CTLFLAG_RW,
170 &unpst_sendspace, 0, "Default stream send space.");
171SYSCTL_ULONG(_net_local_stream, OID_AUTO, recvspace, CTLFLAG_RW,
172 &unpst_recvspace, 0, "Default stream receive space.");
173SYSCTL_ULONG(_net_local_dgram, OID_AUTO, maxdgram, CTLFLAG_RW,
174 &unpdg_sendspace, 0, "Default datagram send space.");
175SYSCTL_ULONG(_net_local_dgram, OID_AUTO, recvspace, CTLFLAG_RW,
176 &unpdg_recvspace, 0, "Default datagram receive space.");
177SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, maxseqpacket, CTLFLAG_RW,
178 &unpsp_sendspace, 0, "Default seqpacket send space.");
179SYSCTL_ULONG(_net_local_seqpacket, OID_AUTO, recvspace, CTLFLAG_RW,
180 &unpsp_recvspace, 0, "Default seqpacket receive space.");
181SYSCTL_INT(_net_local, OID_AUTO, inflight, CTLFLAG_RD, &unp_rights, 0,
182 "File descriptors in flight.");
183SYSCTL_INT(_net_local, OID_AUTO, deferred, CTLFLAG_RD,
184 &unp_defers_count, 0,
185 "File descriptors deferred to taskqueue for close.");
186
187/*
188 * Locking and synchronization:
189 *
190 * Three types of locks exit in the local domain socket implementation: a
191 * global list mutex, a global linkage rwlock, and per-unpcb mutexes. Of the
192 * global locks, the list lock protects the socket count, global generation
193 * number, and stream/datagram global lists. The linkage lock protects the
194 * interconnection of unpcbs, the v_socket and unp_vnode pointers, and can be
195 * held exclusively over the acquisition of multiple unpcb locks to prevent
196 * deadlock.
197 *
198 * UNIX domain sockets each have an unpcb hung off of their so_pcb pointer,
199 * allocated in pru_attach() and freed in pru_detach(). The validity of that
200 * pointer is an invariant, so no lock is required to dereference the so_pcb
201 * pointer if a valid socket reference is held by the caller. In practice,
202 * this is always true during operations performed on a socket. Each unpcb
203 * has a back-pointer to its socket, unp_socket, which will be stable under
204 * the same circumstances.
205 *
206 * This pointer may only be safely dereferenced as long as a valid reference
207 * to the unpcb is held. Typically, this reference will be from the socket,
208 * or from another unpcb when the referring unpcb's lock is held (in order
209 * that the reference not be invalidated during use). For example, to follow
210 * unp->unp_conn->unp_socket, you need unlock the lock on unp, not unp_conn,
211 * as unp_socket remains valid as long as the reference to unp_conn is valid.
212 *
213 * Fields of unpcbss are locked using a per-unpcb lock, unp_mtx. Individual
214 * atomic reads without the lock may be performed "lockless", but more
215 * complex reads and read-modify-writes require the mutex to be held. No
216 * lock order is defined between unpcb locks -- multiple unpcb locks may be
217 * acquired at the same time only when holding the linkage rwlock
218 * exclusively, which prevents deadlocks.
219 *
220 * Blocking with UNIX domain sockets is a tricky issue: unlike most network
221 * protocols, bind() is a non-atomic operation, and connect() requires
222 * potential sleeping in the protocol, due to potentially waiting on local or
223 * distributed file systems. We try to separate "lookup" operations, which
224 * may sleep, and the IPC operations themselves, which typically can occur
225 * with relative atomicity as locks can be held over the entire operation.
226 *
227 * Another tricky issue is simultaneous multi-threaded or multi-process
228 * access to a single UNIX domain socket. These are handled by the flags
229 * UNP_CONNECTING and UNP_BINDING, which prevent concurrent connecting or
230 * binding, both of which involve dropping UNIX domain socket locks in order
231 * to perform namei() and other file system operations.
232 */
233static struct rwlock unp_link_rwlock;
234static struct mtx unp_list_lock;
235static struct mtx unp_defers_lock;
236
237#define UNP_LINK_LOCK_INIT() rw_init(&unp_link_rwlock, \
238 "unp_link_rwlock")
239
240#define UNP_LINK_LOCK_ASSERT() rw_assert(&unp_link_rwlock, \
241 RA_LOCKED)
242#define UNP_LINK_UNLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
243 RA_UNLOCKED)
244
245#define UNP_LINK_RLOCK() rw_rlock(&unp_link_rwlock)
246#define UNP_LINK_RUNLOCK() rw_runlock(&unp_link_rwlock)
247#define UNP_LINK_WLOCK() rw_wlock(&unp_link_rwlock)
248#define UNP_LINK_WUNLOCK() rw_wunlock(&unp_link_rwlock)
249#define UNP_LINK_WLOCK_ASSERT() rw_assert(&unp_link_rwlock, \
250 RA_WLOCKED)
251
252#define UNP_LIST_LOCK_INIT() mtx_init(&unp_list_lock, \
253 "unp_list_lock", NULL, MTX_DEF)
254#define UNP_LIST_LOCK() mtx_lock(&unp_list_lock)
255#define UNP_LIST_UNLOCK() mtx_unlock(&unp_list_lock)
256
257#define UNP_DEFERRED_LOCK_INIT() mtx_init(&unp_defers_lock, \
258 "unp_defer", NULL, MTX_DEF)
259#define UNP_DEFERRED_LOCK() mtx_lock(&unp_defers_lock)
260#define UNP_DEFERRED_UNLOCK() mtx_unlock(&unp_defers_lock)
261
262#define UNP_PCB_LOCK_INIT(unp) mtx_init(&(unp)->unp_mtx, \
263 "unp_mtx", "unp_mtx", \
264 MTX_DUPOK|MTX_DEF|MTX_RECURSE)
265#define UNP_PCB_LOCK_DESTROY(unp) mtx_destroy(&(unp)->unp_mtx)
266#define UNP_PCB_LOCK(unp) mtx_lock(&(unp)->unp_mtx)
267#define UNP_PCB_UNLOCK(unp) mtx_unlock(&(unp)->unp_mtx)
268#define UNP_PCB_LOCK_ASSERT(unp) mtx_assert(&(unp)->unp_mtx, MA_OWNED)
269
270static int uipc_connect2(struct socket *, struct socket *);
271static int uipc_ctloutput(struct socket *, struct sockopt *);
272static int unp_connect(struct socket *, struct sockaddr *,
273 struct thread *);
274static int unp_connect2(struct socket *so, struct socket *so2, int);
275static void unp_disconnect(struct unpcb *unp, struct unpcb *unp2);
276static void unp_dispose(struct mbuf *);
277static void unp_shutdown(struct unpcb *);
278static void unp_drop(struct unpcb *, int);
279static void unp_gc(__unused void *, int);
280static void unp_scan(struct mbuf *, void (*)(struct file *));
281static void unp_discard(struct file *);
282static void unp_freerights(struct file **, int);
283static void unp_init(void);
284static int unp_internalize(struct mbuf **, struct thread *);
285static void unp_internalize_fp(struct file *);
286static int unp_externalize(struct mbuf *, struct mbuf **);
287static int unp_externalize_fp(struct file *);
288static struct mbuf *unp_addsockcred(struct thread *, struct mbuf *);
289static void unp_process_defers(void * __unused, int);
290
291/*
292 * Definitions of protocols supported in the LOCAL domain.
293 */
294static struct domain localdomain;
295static struct pr_usrreqs uipc_usrreqs_dgram, uipc_usrreqs_stream;
296static struct pr_usrreqs uipc_usrreqs_seqpacket;
297static struct protosw localsw[] = {
298{
299 .pr_type = SOCK_STREAM,
300 .pr_domain = &localdomain,
301 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_RIGHTS,
302 .pr_ctloutput = &uipc_ctloutput,
303 .pr_usrreqs = &uipc_usrreqs_stream
304},
305{
306 .pr_type = SOCK_DGRAM,
307 .pr_domain = &localdomain,
308 .pr_flags = PR_ATOMIC|PR_ADDR|PR_RIGHTS,
309 .pr_usrreqs = &uipc_usrreqs_dgram
310},
311{
312 .pr_type = SOCK_SEQPACKET,
313 .pr_domain = &localdomain,
314
315 /*
316 * XXXRW: For now, PR_ADDR because soreceive will bump into them
317 * due to our use of sbappendaddr. A new sbappend variants is needed
318 * that supports both atomic record writes and control data.
319 */
320 .pr_flags = PR_ADDR|PR_ATOMIC|PR_CONNREQUIRED|PR_WANTRCVD|
321 PR_RIGHTS,
322 .pr_usrreqs = &uipc_usrreqs_seqpacket,
323},
324};
325
326static struct domain localdomain = {
327 .dom_family = AF_LOCAL,
328 .dom_name = "local",
329 .dom_init = unp_init,
330 .dom_externalize = unp_externalize,
331 .dom_dispose = unp_dispose,
332 .dom_protosw = localsw,
333 .dom_protoswNPROTOSW = &localsw[sizeof(localsw)/sizeof(localsw[0])]
334};
335DOMAIN_SET(local);
336
337static void
338uipc_abort(struct socket *so)
339{
340 struct unpcb *unp, *unp2;
341
342 unp = sotounpcb(so);
343 KASSERT(unp != NULL, ("uipc_abort: unp == NULL"));
344
345 UNP_LINK_WLOCK();
346 UNP_PCB_LOCK(unp);
347 unp2 = unp->unp_conn;
348 if (unp2 != NULL) {
349 UNP_PCB_LOCK(unp2);
350 unp_drop(unp2, ECONNABORTED);
351 UNP_PCB_UNLOCK(unp2);
352 }
353 UNP_PCB_UNLOCK(unp);
354 UNP_LINK_WUNLOCK();
355}
356
357static int
358uipc_accept(struct socket *so, struct sockaddr **nam)
359{
360 struct unpcb *unp, *unp2;
361 const struct sockaddr *sa;
362
363 /*
364 * Pass back name of connected socket, if it was bound and we are
365 * still connected (our peer may have closed already!).
366 */
367 unp = sotounpcb(so);
368 KASSERT(unp != NULL, ("uipc_accept: unp == NULL"));
369
370 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
371 UNP_LINK_RLOCK();
372 unp2 = unp->unp_conn;
373 if (unp2 != NULL && unp2->unp_addr != NULL) {
374 UNP_PCB_LOCK(unp2);
375 sa = (struct sockaddr *) unp2->unp_addr;
376 bcopy(sa, *nam, sa->sa_len);
377 UNP_PCB_UNLOCK(unp2);
378 } else {
379 sa = &sun_noname;
380 bcopy(sa, *nam, sa->sa_len);
381 }
382 UNP_LINK_RUNLOCK();
383 return (0);
384}
385
386static int
387uipc_attach(struct socket *so, int proto, struct thread *td)
388{
389 u_long sendspace, recvspace;
390 struct unpcb *unp;
391 int error;
392
393 KASSERT(so->so_pcb == NULL, ("uipc_attach: so_pcb != NULL"));
394 if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
395 switch (so->so_type) {
396 case SOCK_STREAM:
397 sendspace = unpst_sendspace;
398 recvspace = unpst_recvspace;
399 break;
400
401 case SOCK_DGRAM:
402 sendspace = unpdg_sendspace;
403 recvspace = unpdg_recvspace;
404 break;
405
406 case SOCK_SEQPACKET:
407 sendspace = unpsp_sendspace;
408 recvspace = unpsp_recvspace;
409 break;
410
411 default:
412 panic("uipc_attach");
413 }
414 error = soreserve(so, sendspace, recvspace);
415 if (error)
416 return (error);
417 }
418 unp = uma_zalloc(unp_zone, M_NOWAIT | M_ZERO);
419 if (unp == NULL)
420 return (ENOBUFS);
421 LIST_INIT(&unp->unp_refs);
422 UNP_PCB_LOCK_INIT(unp);
423 unp->unp_socket = so;
424 so->so_pcb = unp;
425 unp->unp_refcount = 1;
426
427 UNP_LIST_LOCK();
428 unp->unp_gencnt = ++unp_gencnt;
429 unp_count++;
430 switch (so->so_type) {
431 case SOCK_STREAM:
432 LIST_INSERT_HEAD(&unp_shead, unp, unp_link);
433 break;
434
435 case SOCK_DGRAM:
436 LIST_INSERT_HEAD(&unp_dhead, unp, unp_link);
437 break;
438
439 case SOCK_SEQPACKET:
440 LIST_INSERT_HEAD(&unp_sphead, unp, unp_link);
441 break;
442
443 default:
444 panic("uipc_attach");
445 }
446 UNP_LIST_UNLOCK();
447
448 return (0);
449}
450
451static int
452uipc_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
453{
454 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
455 struct vattr vattr;
456 int error, namelen, vfslocked;
457 struct nameidata nd;
458 struct unpcb *unp;
459 struct vnode *vp;
460 struct mount *mp;
461 char *buf;
462
463 unp = sotounpcb(so);
464 KASSERT(unp != NULL, ("uipc_bind: unp == NULL"));
465
466 if (soun->sun_len > sizeof(struct sockaddr_un))
467 return (EINVAL);
468 namelen = soun->sun_len - offsetof(struct sockaddr_un, sun_path);
469 if (namelen <= 0)
470 return (EINVAL);
471
472 /*
473 * We don't allow simultaneous bind() calls on a single UNIX domain
474 * socket, so flag in-progress operations, and return an error if an
475 * operation is already in progress.
476 *
477 * Historically, we have not allowed a socket to be rebound, so this
478 * also returns an error. Not allowing re-binding simplifies the
479 * implementation and avoids a great many possible failure modes.
480 */
481 UNP_PCB_LOCK(unp);
482 if (unp->unp_vnode != NULL) {
483 UNP_PCB_UNLOCK(unp);
484 return (EINVAL);
485 }
486 if (unp->unp_flags & UNP_BINDING) {
487 UNP_PCB_UNLOCK(unp);
488 return (EALREADY);
489 }
490 unp->unp_flags |= UNP_BINDING;
491 UNP_PCB_UNLOCK(unp);
492
493 buf = malloc(namelen + 1, M_TEMP, M_WAITOK);
494 bcopy(soun->sun_path, buf, namelen);
495 buf[namelen] = 0;
496
497restart:
498 vfslocked = 0;
499 NDINIT(&nd, CREATE, MPSAFE | NOFOLLOW | LOCKPARENT | SAVENAME,
500 UIO_SYSSPACE, buf, td);
501/* SHOULD BE ABLE TO ADOPT EXISTING AND wakeup() ALA FIFO's */
502 error = namei(&nd);
503 if (error)
504 goto error;
505 vp = nd.ni_vp;
506 vfslocked = NDHASGIANT(&nd);
507 if (vp != NULL || vn_start_write(nd.ni_dvp, &mp, V_NOWAIT) != 0) {
508 NDFREE(&nd, NDF_ONLY_PNBUF);
509 if (nd.ni_dvp == vp)
510 vrele(nd.ni_dvp);
511 else
512 vput(nd.ni_dvp);
513 if (vp != NULL) {
514 vrele(vp);
515 error = EADDRINUSE;
516 goto error;
517 }
518 error = vn_start_write(NULL, &mp, V_XSLEEP | PCATCH);
519 if (error)
520 goto error;
521 VFS_UNLOCK_GIANT(vfslocked);
522 goto restart;
523 }
524 VATTR_NULL(&vattr);
525 vattr.va_type = VSOCK;
526 vattr.va_mode = (ACCESSPERMS & ~td->td_proc->p_fd->fd_cmask);
527#ifdef MAC
528 error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
529 &vattr);
530#endif
531 if (error == 0)
532 error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
533 NDFREE(&nd, NDF_ONLY_PNBUF);
534 vput(nd.ni_dvp);
535 if (error) {
536 vn_finished_write(mp);
537 goto error;
538 }
539 vp = nd.ni_vp;
540 ASSERT_VOP_ELOCKED(vp, "uipc_bind");
541 soun = (struct sockaddr_un *)sodupsockaddr(nam, M_WAITOK);
542
543 UNP_LINK_WLOCK();
544 UNP_PCB_LOCK(unp);
|
545 vp->v_socket = unp->unp_socket;
| 545 VOP_UNP_BIND(vp, unp->unp_socket);
|
546 unp->unp_vnode = vp;
547 unp->unp_addr = soun;
548 unp->unp_flags &= ~UNP_BINDING;
549 UNP_PCB_UNLOCK(unp);
550 UNP_LINK_WUNLOCK();
551 VOP_UNLOCK(vp, 0);
552 vn_finished_write(mp);
553 VFS_UNLOCK_GIANT(vfslocked);
554 free(buf, M_TEMP);
555 return (0);
556
557error:
558 VFS_UNLOCK_GIANT(vfslocked);
559 UNP_PCB_LOCK(unp);
560 unp->unp_flags &= ~UNP_BINDING;
561 UNP_PCB_UNLOCK(unp);
562 free(buf, M_TEMP);
563 return (error);
564}
565
566static int
567uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
568{
569 int error;
570
571 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
572 UNP_LINK_WLOCK();
573 error = unp_connect(so, nam, td);
574 UNP_LINK_WUNLOCK();
575 return (error);
576}
577
578static void
579uipc_close(struct socket *so)
580{
581 struct unpcb *unp, *unp2;
582
583 unp = sotounpcb(so);
584 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
585
586 UNP_LINK_WLOCK();
587 UNP_PCB_LOCK(unp);
588 unp2 = unp->unp_conn;
589 if (unp2 != NULL) {
590 UNP_PCB_LOCK(unp2);
591 unp_disconnect(unp, unp2);
592 UNP_PCB_UNLOCK(unp2);
593 }
594 UNP_PCB_UNLOCK(unp);
595 UNP_LINK_WUNLOCK();
596}
597
598static int
599uipc_connect2(struct socket *so1, struct socket *so2)
600{
601 struct unpcb *unp, *unp2;
602 int error;
603
604 UNP_LINK_WLOCK();
605 unp = so1->so_pcb;
606 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
607 UNP_PCB_LOCK(unp);
608 unp2 = so2->so_pcb;
609 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
610 UNP_PCB_LOCK(unp2);
611 error = unp_connect2(so1, so2, PRU_CONNECT2);
612 UNP_PCB_UNLOCK(unp2);
613 UNP_PCB_UNLOCK(unp);
614 UNP_LINK_WUNLOCK();
615 return (error);
616}
617
618static void
619uipc_detach(struct socket *so)
620{
621 struct unpcb *unp, *unp2;
622 struct sockaddr_un *saved_unp_addr;
623 struct vnode *vp;
624 int freeunp, local_unp_rights;
625
626 unp = sotounpcb(so);
627 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
628
629 UNP_LINK_WLOCK();
630 UNP_LIST_LOCK();
631 UNP_PCB_LOCK(unp);
632 LIST_REMOVE(unp, unp_link);
633 unp->unp_gencnt = ++unp_gencnt;
634 --unp_count;
635 UNP_LIST_UNLOCK();
636
637 /*
638 * XXXRW: Should assert vp->v_socket == so.
639 */
640 if ((vp = unp->unp_vnode) != NULL) {
| 546 unp->unp_vnode = vp;
547 unp->unp_addr = soun;
548 unp->unp_flags &= ~UNP_BINDING;
549 UNP_PCB_UNLOCK(unp);
550 UNP_LINK_WUNLOCK();
551 VOP_UNLOCK(vp, 0);
552 vn_finished_write(mp);
553 VFS_UNLOCK_GIANT(vfslocked);
554 free(buf, M_TEMP);
555 return (0);
556
557error:
558 VFS_UNLOCK_GIANT(vfslocked);
559 UNP_PCB_LOCK(unp);
560 unp->unp_flags &= ~UNP_BINDING;
561 UNP_PCB_UNLOCK(unp);
562 free(buf, M_TEMP);
563 return (error);
564}
565
566static int
567uipc_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
568{
569 int error;
570
571 KASSERT(td == curthread, ("uipc_connect: td != curthread"));
572 UNP_LINK_WLOCK();
573 error = unp_connect(so, nam, td);
574 UNP_LINK_WUNLOCK();
575 return (error);
576}
577
578static void
579uipc_close(struct socket *so)
580{
581 struct unpcb *unp, *unp2;
582
583 unp = sotounpcb(so);
584 KASSERT(unp != NULL, ("uipc_close: unp == NULL"));
585
586 UNP_LINK_WLOCK();
587 UNP_PCB_LOCK(unp);
588 unp2 = unp->unp_conn;
589 if (unp2 != NULL) {
590 UNP_PCB_LOCK(unp2);
591 unp_disconnect(unp, unp2);
592 UNP_PCB_UNLOCK(unp2);
593 }
594 UNP_PCB_UNLOCK(unp);
595 UNP_LINK_WUNLOCK();
596}
597
598static int
599uipc_connect2(struct socket *so1, struct socket *so2)
600{
601 struct unpcb *unp, *unp2;
602 int error;
603
604 UNP_LINK_WLOCK();
605 unp = so1->so_pcb;
606 KASSERT(unp != NULL, ("uipc_connect2: unp == NULL"));
607 UNP_PCB_LOCK(unp);
608 unp2 = so2->so_pcb;
609 KASSERT(unp2 != NULL, ("uipc_connect2: unp2 == NULL"));
610 UNP_PCB_LOCK(unp2);
611 error = unp_connect2(so1, so2, PRU_CONNECT2);
612 UNP_PCB_UNLOCK(unp2);
613 UNP_PCB_UNLOCK(unp);
614 UNP_LINK_WUNLOCK();
615 return (error);
616}
617
618static void
619uipc_detach(struct socket *so)
620{
621 struct unpcb *unp, *unp2;
622 struct sockaddr_un *saved_unp_addr;
623 struct vnode *vp;
624 int freeunp, local_unp_rights;
625
626 unp = sotounpcb(so);
627 KASSERT(unp != NULL, ("uipc_detach: unp == NULL"));
628
629 UNP_LINK_WLOCK();
630 UNP_LIST_LOCK();
631 UNP_PCB_LOCK(unp);
632 LIST_REMOVE(unp, unp_link);
633 unp->unp_gencnt = ++unp_gencnt;
634 --unp_count;
635 UNP_LIST_UNLOCK();
636
637 /*
638 * XXXRW: Should assert vp->v_socket == so.
639 */
640 if ((vp = unp->unp_vnode) != NULL) {
|
641 unp->unp_vnode->v_socket = NULL;
| 641 VOP_UNP_DETACH(vp);
|
642 unp->unp_vnode = NULL;
643 }
644 unp2 = unp->unp_conn;
645 if (unp2 != NULL) {
646 UNP_PCB_LOCK(unp2);
647 unp_disconnect(unp, unp2);
648 UNP_PCB_UNLOCK(unp2);
649 }
650
651 /*
652 * We hold the linkage lock exclusively, so it's OK to acquire
653 * multiple pcb locks at a time.
654 */
655 while (!LIST_EMPTY(&unp->unp_refs)) {
656 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
657
658 UNP_PCB_LOCK(ref);
659 unp_drop(ref, ECONNRESET);
660 UNP_PCB_UNLOCK(ref);
661 }
662 local_unp_rights = unp_rights;
663 UNP_LINK_WUNLOCK();
664 unp->unp_socket->so_pcb = NULL;
665 saved_unp_addr = unp->unp_addr;
666 unp->unp_addr = NULL;
667 unp->unp_refcount--;
668 freeunp = (unp->unp_refcount == 0);
669 if (saved_unp_addr != NULL)
670 free(saved_unp_addr, M_SONAME);
671 if (freeunp) {
672 UNP_PCB_LOCK_DESTROY(unp);
673 uma_zfree(unp_zone, unp);
674 } else
675 UNP_PCB_UNLOCK(unp);
676 if (vp) {
677 int vfslocked;
678
679 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
680 vrele(vp);
681 VFS_UNLOCK_GIANT(vfslocked);
682 }
683 if (local_unp_rights)
684 taskqueue_enqueue(taskqueue_thread, &unp_gc_task);
685}
686
687static int
688uipc_disconnect(struct socket *so)
689{
690 struct unpcb *unp, *unp2;
691
692 unp = sotounpcb(so);
693 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
694
695 UNP_LINK_WLOCK();
696 UNP_PCB_LOCK(unp);
697 unp2 = unp->unp_conn;
698 if (unp2 != NULL) {
699 UNP_PCB_LOCK(unp2);
700 unp_disconnect(unp, unp2);
701 UNP_PCB_UNLOCK(unp2);
702 }
703 UNP_PCB_UNLOCK(unp);
704 UNP_LINK_WUNLOCK();
705 return (0);
706}
707
708static int
709uipc_listen(struct socket *so, int backlog, struct thread *td)
710{
711 struct unpcb *unp;
712 int error;
713
714 unp = sotounpcb(so);
715 KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
716
717 UNP_PCB_LOCK(unp);
718 if (unp->unp_vnode == NULL) {
719 UNP_PCB_UNLOCK(unp);
720 return (EINVAL);
721 }
722
723 SOCK_LOCK(so);
724 error = solisten_proto_check(so);
725 if (error == 0) {
726 cru2x(td->td_ucred, &unp->unp_peercred);
727 unp->unp_flags |= UNP_HAVEPCCACHED;
728 solisten_proto(so, backlog);
729 }
730 SOCK_UNLOCK(so);
731 UNP_PCB_UNLOCK(unp);
732 return (error);
733}
734
735static int
736uipc_peeraddr(struct socket *so, struct sockaddr **nam)
737{
738 struct unpcb *unp, *unp2;
739 const struct sockaddr *sa;
740
741 unp = sotounpcb(so);
742 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
743
744 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
745 UNP_LINK_RLOCK();
746 /*
747 * XXX: It seems that this test always fails even when connection is
748 * established. So, this else clause is added as workaround to
749 * return PF_LOCAL sockaddr.
750 */
751 unp2 = unp->unp_conn;
752 if (unp2 != NULL) {
753 UNP_PCB_LOCK(unp2);
754 if (unp2->unp_addr != NULL)
755 sa = (struct sockaddr *) unp2->unp_addr;
756 else
757 sa = &sun_noname;
758 bcopy(sa, *nam, sa->sa_len);
759 UNP_PCB_UNLOCK(unp2);
760 } else {
761 sa = &sun_noname;
762 bcopy(sa, *nam, sa->sa_len);
763 }
764 UNP_LINK_RUNLOCK();
765 return (0);
766}
767
768static int
769uipc_rcvd(struct socket *so, int flags)
770{
771 struct unpcb *unp, *unp2;
772 struct socket *so2;
773 u_int mbcnt, sbcc;
774 u_long newhiwat;
775
776 unp = sotounpcb(so);
777 KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
778
779 if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
780 panic("uipc_rcvd socktype %d", so->so_type);
781
782 /*
783 * Adjust backpressure on sender and wakeup any waiting to write.
784 *
785 * The unp lock is acquired to maintain the validity of the unp_conn
786 * pointer; no lock on unp2 is required as unp2->unp_socket will be
787 * static as long as we don't permit unp2 to disconnect from unp,
788 * which is prevented by the lock on unp. We cache values from
789 * so_rcv to avoid holding the so_rcv lock over the entire
790 * transaction on the remote so_snd.
791 */
792 SOCKBUF_LOCK(&so->so_rcv);
793 mbcnt = so->so_rcv.sb_mbcnt;
794 sbcc = so->so_rcv.sb_cc;
795 SOCKBUF_UNLOCK(&so->so_rcv);
796 UNP_PCB_LOCK(unp);
797 unp2 = unp->unp_conn;
798 if (unp2 == NULL) {
799 UNP_PCB_UNLOCK(unp);
800 return (0);
801 }
802 so2 = unp2->unp_socket;
803 SOCKBUF_LOCK(&so2->so_snd);
804 so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
805 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
806 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
807 newhiwat, RLIM_INFINITY);
808 sowwakeup_locked(so2);
809 unp->unp_mbcnt = mbcnt;
810 unp->unp_cc = sbcc;
811 UNP_PCB_UNLOCK(unp);
812 return (0);
813}
814
815static int
816uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
817 struct mbuf *control, struct thread *td)
818{
819 struct unpcb *unp, *unp2;
820 struct socket *so2;
821 u_int mbcnt_delta, sbcc;
822 u_int newhiwat;
823 int error = 0;
824
825 unp = sotounpcb(so);
826 KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
827
828 if (flags & PRUS_OOB) {
829 error = EOPNOTSUPP;
830 goto release;
831 }
832 if (control != NULL && (error = unp_internalize(&control, td)))
833 goto release;
834 if ((nam != NULL) || (flags & PRUS_EOF))
835 UNP_LINK_WLOCK();
836 else
837 UNP_LINK_RLOCK();
838 switch (so->so_type) {
839 case SOCK_DGRAM:
840 {
841 const struct sockaddr *from;
842
843 unp2 = unp->unp_conn;
844 if (nam != NULL) {
845 UNP_LINK_WLOCK_ASSERT();
846 if (unp2 != NULL) {
847 error = EISCONN;
848 break;
849 }
850 error = unp_connect(so, nam, td);
851 if (error)
852 break;
853 unp2 = unp->unp_conn;
854 }
855
856 /*
857 * Because connect() and send() are non-atomic in a sendto()
858 * with a target address, it's possible that the socket will
859 * have disconnected before the send() can run. In that case
860 * return the slightly counter-intuitive but otherwise
861 * correct error that the socket is not connected.
862 */
863 if (unp2 == NULL) {
864 error = ENOTCONN;
865 break;
866 }
867 /* Lockless read. */
868 if (unp2->unp_flags & UNP_WANTCRED)
869 control = unp_addsockcred(td, control);
870 UNP_PCB_LOCK(unp);
871 if (unp->unp_addr != NULL)
872 from = (struct sockaddr *)unp->unp_addr;
873 else
874 from = &sun_noname;
875 so2 = unp2->unp_socket;
876 SOCKBUF_LOCK(&so2->so_rcv);
877 if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
878 sorwakeup_locked(so2);
879 m = NULL;
880 control = NULL;
881 } else {
882 SOCKBUF_UNLOCK(&so2->so_rcv);
883 error = ENOBUFS;
884 }
885 if (nam != NULL) {
886 UNP_LINK_WLOCK_ASSERT();
887 UNP_PCB_LOCK(unp2);
888 unp_disconnect(unp, unp2);
889 UNP_PCB_UNLOCK(unp2);
890 }
891 UNP_PCB_UNLOCK(unp);
892 break;
893 }
894
895 case SOCK_SEQPACKET:
896 case SOCK_STREAM:
897 if ((so->so_state & SS_ISCONNECTED) == 0) {
898 if (nam != NULL) {
899 UNP_LINK_WLOCK_ASSERT();
900 error = unp_connect(so, nam, td);
901 if (error)
902 break; /* XXX */
903 } else {
904 error = ENOTCONN;
905 break;
906 }
907 }
908
909 /* Lockless read. */
910 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
911 error = EPIPE;
912 break;
913 }
914
915 /*
916 * Because connect() and send() are non-atomic in a sendto()
917 * with a target address, it's possible that the socket will
918 * have disconnected before the send() can run. In that case
919 * return the slightly counter-intuitive but otherwise
920 * correct error that the socket is not connected.
921 *
922 * Locking here must be done carefully: the linkage lock
923 * prevents interconnections between unpcbs from changing, so
924 * we can traverse from unp to unp2 without acquiring unp's
925 * lock. Socket buffer locks follow unpcb locks, so we can
926 * acquire both remote and lock socket buffer locks.
927 */
928 unp2 = unp->unp_conn;
929 if (unp2 == NULL) {
930 error = ENOTCONN;
931 break;
932 }
933 so2 = unp2->unp_socket;
934 UNP_PCB_LOCK(unp2);
935 SOCKBUF_LOCK(&so2->so_rcv);
936 if (unp2->unp_flags & UNP_WANTCRED) {
937 /*
938 * Credentials are passed only once on SOCK_STREAM.
939 */
940 unp2->unp_flags &= ~UNP_WANTCRED;
941 control = unp_addsockcred(td, control);
942 }
943 /*
944 * Send to paired receive port, and then reduce send buffer
945 * hiwater marks to maintain backpressure. Wake up readers.
946 */
947 switch (so->so_type) {
948 case SOCK_STREAM:
949 if (control != NULL) {
950 if (sbappendcontrol_locked(&so2->so_rcv, m,
951 control))
952 control = NULL;
953 } else
954 sbappend_locked(&so2->so_rcv, m);
955 break;
956
957 case SOCK_SEQPACKET: {
958 const struct sockaddr *from;
959
960 from = &sun_noname;
961 if (sbappendaddr_locked(&so2->so_rcv, from, m,
962 control))
963 control = NULL;
964 break;
965 }
966 }
967
968 /*
969 * XXXRW: While fine for SOCK_STREAM, this conflates maximum
970 * datagram size and back-pressure for SOCK_SEQPACKET, which
971 * can lead to undesired return of EMSGSIZE on send instead
972 * of more desirable blocking.
973 */
974 mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
975 unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
976 sbcc = so2->so_rcv.sb_cc;
977 sorwakeup_locked(so2);
978
979 SOCKBUF_LOCK(&so->so_snd);
980 if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
981 newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
982 else
983 newhiwat = 0;
984 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
985 newhiwat, RLIM_INFINITY);
986 so->so_snd.sb_mbmax -= mbcnt_delta;
987 SOCKBUF_UNLOCK(&so->so_snd);
988 unp2->unp_cc = sbcc;
989 UNP_PCB_UNLOCK(unp2);
990 m = NULL;
991 break;
992
993 default:
994 panic("uipc_send unknown socktype");
995 }
996
997 /*
998 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
999 */
1000 if (flags & PRUS_EOF) {
1001 UNP_PCB_LOCK(unp);
1002 socantsendmore(so);
1003 unp_shutdown(unp);
1004 UNP_PCB_UNLOCK(unp);
1005 }
1006
1007 if ((nam != NULL) || (flags & PRUS_EOF))
1008 UNP_LINK_WUNLOCK();
1009 else
1010 UNP_LINK_RUNLOCK();
1011
1012 if (control != NULL && error != 0)
1013 unp_dispose(control);
1014
1015release:
1016 if (control != NULL)
1017 m_freem(control);
1018 if (m != NULL)
1019 m_freem(m);
1020 return (error);
1021}
1022
1023static int
1024uipc_sense(struct socket *so, struct stat *sb)
1025{
1026 struct unpcb *unp, *unp2;
1027 struct socket *so2;
1028
1029 unp = sotounpcb(so);
1030 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1031
1032 sb->st_blksize = so->so_snd.sb_hiwat;
1033 UNP_LINK_RLOCK();
1034 UNP_PCB_LOCK(unp);
1035 unp2 = unp->unp_conn;
1036 if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
1037 unp2 != NULL) {
1038 so2 = unp2->unp_socket;
1039 sb->st_blksize += so2->so_rcv.sb_cc;
1040 }
1041 sb->st_dev = NODEV;
1042 if (unp->unp_ino == 0)
1043 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1044 sb->st_ino = unp->unp_ino;
1045 UNP_PCB_UNLOCK(unp);
1046 UNP_LINK_RUNLOCK();
1047 return (0);
1048}
1049
1050static int
1051uipc_shutdown(struct socket *so)
1052{
1053 struct unpcb *unp;
1054
1055 unp = sotounpcb(so);
1056 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1057
1058 UNP_LINK_WLOCK();
1059 UNP_PCB_LOCK(unp);
1060 socantsendmore(so);
1061 unp_shutdown(unp);
1062 UNP_PCB_UNLOCK(unp);
1063 UNP_LINK_WUNLOCK();
1064 return (0);
1065}
1066
1067static int
1068uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1069{
1070 struct unpcb *unp;
1071 const struct sockaddr *sa;
1072
1073 unp = sotounpcb(so);
1074 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1075
1076 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1077 UNP_PCB_LOCK(unp);
1078 if (unp->unp_addr != NULL)
1079 sa = (struct sockaddr *) unp->unp_addr;
1080 else
1081 sa = &sun_noname;
1082 bcopy(sa, *nam, sa->sa_len);
1083 UNP_PCB_UNLOCK(unp);
1084 return (0);
1085}
1086
1087static struct pr_usrreqs uipc_usrreqs_dgram = {
1088 .pru_abort = uipc_abort,
1089 .pru_accept = uipc_accept,
1090 .pru_attach = uipc_attach,
1091 .pru_bind = uipc_bind,
1092 .pru_connect = uipc_connect,
1093 .pru_connect2 = uipc_connect2,
1094 .pru_detach = uipc_detach,
1095 .pru_disconnect = uipc_disconnect,
1096 .pru_listen = uipc_listen,
1097 .pru_peeraddr = uipc_peeraddr,
1098 .pru_rcvd = uipc_rcvd,
1099 .pru_send = uipc_send,
1100 .pru_sense = uipc_sense,
1101 .pru_shutdown = uipc_shutdown,
1102 .pru_sockaddr = uipc_sockaddr,
1103 .pru_soreceive = soreceive_dgram,
1104 .pru_close = uipc_close,
1105};
1106
1107static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1108 .pru_abort = uipc_abort,
1109 .pru_accept = uipc_accept,
1110 .pru_attach = uipc_attach,
1111 .pru_bind = uipc_bind,
1112 .pru_connect = uipc_connect,
1113 .pru_connect2 = uipc_connect2,
1114 .pru_detach = uipc_detach,
1115 .pru_disconnect = uipc_disconnect,
1116 .pru_listen = uipc_listen,
1117 .pru_peeraddr = uipc_peeraddr,
1118 .pru_rcvd = uipc_rcvd,
1119 .pru_send = uipc_send,
1120 .pru_sense = uipc_sense,
1121 .pru_shutdown = uipc_shutdown,
1122 .pru_sockaddr = uipc_sockaddr,
1123 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1124 .pru_close = uipc_close,
1125};
1126
1127static struct pr_usrreqs uipc_usrreqs_stream = {
1128 .pru_abort = uipc_abort,
1129 .pru_accept = uipc_accept,
1130 .pru_attach = uipc_attach,
1131 .pru_bind = uipc_bind,
1132 .pru_connect = uipc_connect,
1133 .pru_connect2 = uipc_connect2,
1134 .pru_detach = uipc_detach,
1135 .pru_disconnect = uipc_disconnect,
1136 .pru_listen = uipc_listen,
1137 .pru_peeraddr = uipc_peeraddr,
1138 .pru_rcvd = uipc_rcvd,
1139 .pru_send = uipc_send,
1140 .pru_sense = uipc_sense,
1141 .pru_shutdown = uipc_shutdown,
1142 .pru_sockaddr = uipc_sockaddr,
1143 .pru_soreceive = soreceive_generic,
1144 .pru_close = uipc_close,
1145};
1146
1147static int
1148uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1149{
1150 struct unpcb *unp;
1151 struct xucred xu;
1152 int error, optval;
1153
1154 if (sopt->sopt_level != 0)
1155 return (EINVAL);
1156
1157 unp = sotounpcb(so);
1158 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1159 error = 0;
1160 switch (sopt->sopt_dir) {
1161 case SOPT_GET:
1162 switch (sopt->sopt_name) {
1163 case LOCAL_PEERCRED:
1164 UNP_PCB_LOCK(unp);
1165 if (unp->unp_flags & UNP_HAVEPC)
1166 xu = unp->unp_peercred;
1167 else {
1168 if (so->so_type == SOCK_STREAM)
1169 error = ENOTCONN;
1170 else
1171 error = EINVAL;
1172 }
1173 UNP_PCB_UNLOCK(unp);
1174 if (error == 0)
1175 error = sooptcopyout(sopt, &xu, sizeof(xu));
1176 break;
1177
1178 case LOCAL_CREDS:
1179 /* Unlocked read. */
1180 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1181 error = sooptcopyout(sopt, &optval, sizeof(optval));
1182 break;
1183
1184 case LOCAL_CONNWAIT:
1185 /* Unlocked read. */
1186 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1187 error = sooptcopyout(sopt, &optval, sizeof(optval));
1188 break;
1189
1190 default:
1191 error = EOPNOTSUPP;
1192 break;
1193 }
1194 break;
1195
1196 case SOPT_SET:
1197 switch (sopt->sopt_name) {
1198 case LOCAL_CREDS:
1199 case LOCAL_CONNWAIT:
1200 error = sooptcopyin(sopt, &optval, sizeof(optval),
1201 sizeof(optval));
1202 if (error)
1203 break;
1204
1205#define OPTSET(bit) do { \
1206 UNP_PCB_LOCK(unp); \
1207 if (optval) \
1208 unp->unp_flags |= bit; \
1209 else \
1210 unp->unp_flags &= ~bit; \
1211 UNP_PCB_UNLOCK(unp); \
1212} while (0)
1213
1214 switch (sopt->sopt_name) {
1215 case LOCAL_CREDS:
1216 OPTSET(UNP_WANTCRED);
1217 break;
1218
1219 case LOCAL_CONNWAIT:
1220 OPTSET(UNP_CONNWAIT);
1221 break;
1222
1223 default:
1224 break;
1225 }
1226 break;
1227#undef OPTSET
1228 default:
1229 error = ENOPROTOOPT;
1230 break;
1231 }
1232 break;
1233
1234 default:
1235 error = EOPNOTSUPP;
1236 break;
1237 }
1238 return (error);
1239}
1240
1241static int
1242unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1243{
1244 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1245 struct vnode *vp;
1246 struct socket *so2, *so3;
1247 struct unpcb *unp, *unp2, *unp3;
1248 int error, len, vfslocked;
1249 struct nameidata nd;
1250 char buf[SOCK_MAXADDRLEN];
1251 struct sockaddr *sa;
1252
1253 UNP_LINK_WLOCK_ASSERT();
1254
1255 unp = sotounpcb(so);
1256 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1257
1258 if (nam->sa_len > sizeof(struct sockaddr_un))
1259 return (EINVAL);
1260 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1261 if (len <= 0)
1262 return (EINVAL);
1263 bcopy(soun->sun_path, buf, len);
1264 buf[len] = 0;
1265
1266 UNP_PCB_LOCK(unp);
1267 if (unp->unp_flags & UNP_CONNECTING) {
1268 UNP_PCB_UNLOCK(unp);
1269 return (EALREADY);
1270 }
1271 UNP_LINK_WUNLOCK();
1272 unp->unp_flags |= UNP_CONNECTING;
1273 UNP_PCB_UNLOCK(unp);
1274
1275 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1276 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKSHARED | LOCKLEAF,
1277 UIO_SYSSPACE, buf, td);
1278 error = namei(&nd);
1279 if (error)
1280 vp = NULL;
1281 else
1282 vp = nd.ni_vp;
1283 ASSERT_VOP_LOCKED(vp, "unp_connect");
1284 vfslocked = NDHASGIANT(&nd);
1285 NDFREE(&nd, NDF_ONLY_PNBUF);
1286 if (error)
1287 goto bad;
1288
1289 if (vp->v_type != VSOCK) {
1290 error = ENOTSOCK;
1291 goto bad;
1292 }
1293#ifdef MAC
1294 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1295 if (error)
1296 goto bad;
1297#endif
1298 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1299 if (error)
1300 goto bad;
1301 VFS_UNLOCK_GIANT(vfslocked);
1302
1303 unp = sotounpcb(so);
1304 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1305
1306 /*
1307 * Lock linkage lock for two reasons: make sure v_socket is stable,
1308 * and to protect simultaneous locking of multiple pcbs.
1309 */
1310 UNP_LINK_WLOCK();
| 642 unp->unp_vnode = NULL;
643 }
644 unp2 = unp->unp_conn;
645 if (unp2 != NULL) {
646 UNP_PCB_LOCK(unp2);
647 unp_disconnect(unp, unp2);
648 UNP_PCB_UNLOCK(unp2);
649 }
650
651 /*
652 * We hold the linkage lock exclusively, so it's OK to acquire
653 * multiple pcb locks at a time.
654 */
655 while (!LIST_EMPTY(&unp->unp_refs)) {
656 struct unpcb *ref = LIST_FIRST(&unp->unp_refs);
657
658 UNP_PCB_LOCK(ref);
659 unp_drop(ref, ECONNRESET);
660 UNP_PCB_UNLOCK(ref);
661 }
662 local_unp_rights = unp_rights;
663 UNP_LINK_WUNLOCK();
664 unp->unp_socket->so_pcb = NULL;
665 saved_unp_addr = unp->unp_addr;
666 unp->unp_addr = NULL;
667 unp->unp_refcount--;
668 freeunp = (unp->unp_refcount == 0);
669 if (saved_unp_addr != NULL)
670 free(saved_unp_addr, M_SONAME);
671 if (freeunp) {
672 UNP_PCB_LOCK_DESTROY(unp);
673 uma_zfree(unp_zone, unp);
674 } else
675 UNP_PCB_UNLOCK(unp);
676 if (vp) {
677 int vfslocked;
678
679 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
680 vrele(vp);
681 VFS_UNLOCK_GIANT(vfslocked);
682 }
683 if (local_unp_rights)
684 taskqueue_enqueue(taskqueue_thread, &unp_gc_task);
685}
686
687static int
688uipc_disconnect(struct socket *so)
689{
690 struct unpcb *unp, *unp2;
691
692 unp = sotounpcb(so);
693 KASSERT(unp != NULL, ("uipc_disconnect: unp == NULL"));
694
695 UNP_LINK_WLOCK();
696 UNP_PCB_LOCK(unp);
697 unp2 = unp->unp_conn;
698 if (unp2 != NULL) {
699 UNP_PCB_LOCK(unp2);
700 unp_disconnect(unp, unp2);
701 UNP_PCB_UNLOCK(unp2);
702 }
703 UNP_PCB_UNLOCK(unp);
704 UNP_LINK_WUNLOCK();
705 return (0);
706}
707
708static int
709uipc_listen(struct socket *so, int backlog, struct thread *td)
710{
711 struct unpcb *unp;
712 int error;
713
714 unp = sotounpcb(so);
715 KASSERT(unp != NULL, ("uipc_listen: unp == NULL"));
716
717 UNP_PCB_LOCK(unp);
718 if (unp->unp_vnode == NULL) {
719 UNP_PCB_UNLOCK(unp);
720 return (EINVAL);
721 }
722
723 SOCK_LOCK(so);
724 error = solisten_proto_check(so);
725 if (error == 0) {
726 cru2x(td->td_ucred, &unp->unp_peercred);
727 unp->unp_flags |= UNP_HAVEPCCACHED;
728 solisten_proto(so, backlog);
729 }
730 SOCK_UNLOCK(so);
731 UNP_PCB_UNLOCK(unp);
732 return (error);
733}
734
735static int
736uipc_peeraddr(struct socket *so, struct sockaddr **nam)
737{
738 struct unpcb *unp, *unp2;
739 const struct sockaddr *sa;
740
741 unp = sotounpcb(so);
742 KASSERT(unp != NULL, ("uipc_peeraddr: unp == NULL"));
743
744 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
745 UNP_LINK_RLOCK();
746 /*
747 * XXX: It seems that this test always fails even when connection is
748 * established. So, this else clause is added as workaround to
749 * return PF_LOCAL sockaddr.
750 */
751 unp2 = unp->unp_conn;
752 if (unp2 != NULL) {
753 UNP_PCB_LOCK(unp2);
754 if (unp2->unp_addr != NULL)
755 sa = (struct sockaddr *) unp2->unp_addr;
756 else
757 sa = &sun_noname;
758 bcopy(sa, *nam, sa->sa_len);
759 UNP_PCB_UNLOCK(unp2);
760 } else {
761 sa = &sun_noname;
762 bcopy(sa, *nam, sa->sa_len);
763 }
764 UNP_LINK_RUNLOCK();
765 return (0);
766}
767
768static int
769uipc_rcvd(struct socket *so, int flags)
770{
771 struct unpcb *unp, *unp2;
772 struct socket *so2;
773 u_int mbcnt, sbcc;
774 u_long newhiwat;
775
776 unp = sotounpcb(so);
777 KASSERT(unp != NULL, ("uipc_rcvd: unp == NULL"));
778
779 if (so->so_type != SOCK_STREAM && so->so_type != SOCK_SEQPACKET)
780 panic("uipc_rcvd socktype %d", so->so_type);
781
782 /*
783 * Adjust backpressure on sender and wakeup any waiting to write.
784 *
785 * The unp lock is acquired to maintain the validity of the unp_conn
786 * pointer; no lock on unp2 is required as unp2->unp_socket will be
787 * static as long as we don't permit unp2 to disconnect from unp,
788 * which is prevented by the lock on unp. We cache values from
789 * so_rcv to avoid holding the so_rcv lock over the entire
790 * transaction on the remote so_snd.
791 */
792 SOCKBUF_LOCK(&so->so_rcv);
793 mbcnt = so->so_rcv.sb_mbcnt;
794 sbcc = so->so_rcv.sb_cc;
795 SOCKBUF_UNLOCK(&so->so_rcv);
796 UNP_PCB_LOCK(unp);
797 unp2 = unp->unp_conn;
798 if (unp2 == NULL) {
799 UNP_PCB_UNLOCK(unp);
800 return (0);
801 }
802 so2 = unp2->unp_socket;
803 SOCKBUF_LOCK(&so2->so_snd);
804 so2->so_snd.sb_mbmax += unp->unp_mbcnt - mbcnt;
805 newhiwat = so2->so_snd.sb_hiwat + unp->unp_cc - sbcc;
806 (void)chgsbsize(so2->so_cred->cr_uidinfo, &so2->so_snd.sb_hiwat,
807 newhiwat, RLIM_INFINITY);
808 sowwakeup_locked(so2);
809 unp->unp_mbcnt = mbcnt;
810 unp->unp_cc = sbcc;
811 UNP_PCB_UNLOCK(unp);
812 return (0);
813}
814
815static int
816uipc_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
817 struct mbuf *control, struct thread *td)
818{
819 struct unpcb *unp, *unp2;
820 struct socket *so2;
821 u_int mbcnt_delta, sbcc;
822 u_int newhiwat;
823 int error = 0;
824
825 unp = sotounpcb(so);
826 KASSERT(unp != NULL, ("uipc_send: unp == NULL"));
827
828 if (flags & PRUS_OOB) {
829 error = EOPNOTSUPP;
830 goto release;
831 }
832 if (control != NULL && (error = unp_internalize(&control, td)))
833 goto release;
834 if ((nam != NULL) || (flags & PRUS_EOF))
835 UNP_LINK_WLOCK();
836 else
837 UNP_LINK_RLOCK();
838 switch (so->so_type) {
839 case SOCK_DGRAM:
840 {
841 const struct sockaddr *from;
842
843 unp2 = unp->unp_conn;
844 if (nam != NULL) {
845 UNP_LINK_WLOCK_ASSERT();
846 if (unp2 != NULL) {
847 error = EISCONN;
848 break;
849 }
850 error = unp_connect(so, nam, td);
851 if (error)
852 break;
853 unp2 = unp->unp_conn;
854 }
855
856 /*
857 * Because connect() and send() are non-atomic in a sendto()
858 * with a target address, it's possible that the socket will
859 * have disconnected before the send() can run. In that case
860 * return the slightly counter-intuitive but otherwise
861 * correct error that the socket is not connected.
862 */
863 if (unp2 == NULL) {
864 error = ENOTCONN;
865 break;
866 }
867 /* Lockless read. */
868 if (unp2->unp_flags & UNP_WANTCRED)
869 control = unp_addsockcred(td, control);
870 UNP_PCB_LOCK(unp);
871 if (unp->unp_addr != NULL)
872 from = (struct sockaddr *)unp->unp_addr;
873 else
874 from = &sun_noname;
875 so2 = unp2->unp_socket;
876 SOCKBUF_LOCK(&so2->so_rcv);
877 if (sbappendaddr_locked(&so2->so_rcv, from, m, control)) {
878 sorwakeup_locked(so2);
879 m = NULL;
880 control = NULL;
881 } else {
882 SOCKBUF_UNLOCK(&so2->so_rcv);
883 error = ENOBUFS;
884 }
885 if (nam != NULL) {
886 UNP_LINK_WLOCK_ASSERT();
887 UNP_PCB_LOCK(unp2);
888 unp_disconnect(unp, unp2);
889 UNP_PCB_UNLOCK(unp2);
890 }
891 UNP_PCB_UNLOCK(unp);
892 break;
893 }
894
895 case SOCK_SEQPACKET:
896 case SOCK_STREAM:
897 if ((so->so_state & SS_ISCONNECTED) == 0) {
898 if (nam != NULL) {
899 UNP_LINK_WLOCK_ASSERT();
900 error = unp_connect(so, nam, td);
901 if (error)
902 break; /* XXX */
903 } else {
904 error = ENOTCONN;
905 break;
906 }
907 }
908
909 /* Lockless read. */
910 if (so->so_snd.sb_state & SBS_CANTSENDMORE) {
911 error = EPIPE;
912 break;
913 }
914
915 /*
916 * Because connect() and send() are non-atomic in a sendto()
917 * with a target address, it's possible that the socket will
918 * have disconnected before the send() can run. In that case
919 * return the slightly counter-intuitive but otherwise
920 * correct error that the socket is not connected.
921 *
922 * Locking here must be done carefully: the linkage lock
923 * prevents interconnections between unpcbs from changing, so
924 * we can traverse from unp to unp2 without acquiring unp's
925 * lock. Socket buffer locks follow unpcb locks, so we can
926 * acquire both remote and lock socket buffer locks.
927 */
928 unp2 = unp->unp_conn;
929 if (unp2 == NULL) {
930 error = ENOTCONN;
931 break;
932 }
933 so2 = unp2->unp_socket;
934 UNP_PCB_LOCK(unp2);
935 SOCKBUF_LOCK(&so2->so_rcv);
936 if (unp2->unp_flags & UNP_WANTCRED) {
937 /*
938 * Credentials are passed only once on SOCK_STREAM.
939 */
940 unp2->unp_flags &= ~UNP_WANTCRED;
941 control = unp_addsockcred(td, control);
942 }
943 /*
944 * Send to paired receive port, and then reduce send buffer
945 * hiwater marks to maintain backpressure. Wake up readers.
946 */
947 switch (so->so_type) {
948 case SOCK_STREAM:
949 if (control != NULL) {
950 if (sbappendcontrol_locked(&so2->so_rcv, m,
951 control))
952 control = NULL;
953 } else
954 sbappend_locked(&so2->so_rcv, m);
955 break;
956
957 case SOCK_SEQPACKET: {
958 const struct sockaddr *from;
959
960 from = &sun_noname;
961 if (sbappendaddr_locked(&so2->so_rcv, from, m,
962 control))
963 control = NULL;
964 break;
965 }
966 }
967
968 /*
969 * XXXRW: While fine for SOCK_STREAM, this conflates maximum
970 * datagram size and back-pressure for SOCK_SEQPACKET, which
971 * can lead to undesired return of EMSGSIZE on send instead
972 * of more desirable blocking.
973 */
974 mbcnt_delta = so2->so_rcv.sb_mbcnt - unp2->unp_mbcnt;
975 unp2->unp_mbcnt = so2->so_rcv.sb_mbcnt;
976 sbcc = so2->so_rcv.sb_cc;
977 sorwakeup_locked(so2);
978
979 SOCKBUF_LOCK(&so->so_snd);
980 if ((int)so->so_snd.sb_hiwat >= (int)(sbcc - unp2->unp_cc))
981 newhiwat = so->so_snd.sb_hiwat - (sbcc - unp2->unp_cc);
982 else
983 newhiwat = 0;
984 (void)chgsbsize(so->so_cred->cr_uidinfo, &so->so_snd.sb_hiwat,
985 newhiwat, RLIM_INFINITY);
986 so->so_snd.sb_mbmax -= mbcnt_delta;
987 SOCKBUF_UNLOCK(&so->so_snd);
988 unp2->unp_cc = sbcc;
989 UNP_PCB_UNLOCK(unp2);
990 m = NULL;
991 break;
992
993 default:
994 panic("uipc_send unknown socktype");
995 }
996
997 /*
998 * PRUS_EOF is equivalent to pru_send followed by pru_shutdown.
999 */
1000 if (flags & PRUS_EOF) {
1001 UNP_PCB_LOCK(unp);
1002 socantsendmore(so);
1003 unp_shutdown(unp);
1004 UNP_PCB_UNLOCK(unp);
1005 }
1006
1007 if ((nam != NULL) || (flags & PRUS_EOF))
1008 UNP_LINK_WUNLOCK();
1009 else
1010 UNP_LINK_RUNLOCK();
1011
1012 if (control != NULL && error != 0)
1013 unp_dispose(control);
1014
1015release:
1016 if (control != NULL)
1017 m_freem(control);
1018 if (m != NULL)
1019 m_freem(m);
1020 return (error);
1021}
1022
1023static int
1024uipc_sense(struct socket *so, struct stat *sb)
1025{
1026 struct unpcb *unp, *unp2;
1027 struct socket *so2;
1028
1029 unp = sotounpcb(so);
1030 KASSERT(unp != NULL, ("uipc_sense: unp == NULL"));
1031
1032 sb->st_blksize = so->so_snd.sb_hiwat;
1033 UNP_LINK_RLOCK();
1034 UNP_PCB_LOCK(unp);
1035 unp2 = unp->unp_conn;
1036 if ((so->so_type == SOCK_STREAM || so->so_type == SOCK_SEQPACKET) &&
1037 unp2 != NULL) {
1038 so2 = unp2->unp_socket;
1039 sb->st_blksize += so2->so_rcv.sb_cc;
1040 }
1041 sb->st_dev = NODEV;
1042 if (unp->unp_ino == 0)
1043 unp->unp_ino = (++unp_ino == 0) ? ++unp_ino : unp_ino;
1044 sb->st_ino = unp->unp_ino;
1045 UNP_PCB_UNLOCK(unp);
1046 UNP_LINK_RUNLOCK();
1047 return (0);
1048}
1049
1050static int
1051uipc_shutdown(struct socket *so)
1052{
1053 struct unpcb *unp;
1054
1055 unp = sotounpcb(so);
1056 KASSERT(unp != NULL, ("uipc_shutdown: unp == NULL"));
1057
1058 UNP_LINK_WLOCK();
1059 UNP_PCB_LOCK(unp);
1060 socantsendmore(so);
1061 unp_shutdown(unp);
1062 UNP_PCB_UNLOCK(unp);
1063 UNP_LINK_WUNLOCK();
1064 return (0);
1065}
1066
1067static int
1068uipc_sockaddr(struct socket *so, struct sockaddr **nam)
1069{
1070 struct unpcb *unp;
1071 const struct sockaddr *sa;
1072
1073 unp = sotounpcb(so);
1074 KASSERT(unp != NULL, ("uipc_sockaddr: unp == NULL"));
1075
1076 *nam = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1077 UNP_PCB_LOCK(unp);
1078 if (unp->unp_addr != NULL)
1079 sa = (struct sockaddr *) unp->unp_addr;
1080 else
1081 sa = &sun_noname;
1082 bcopy(sa, *nam, sa->sa_len);
1083 UNP_PCB_UNLOCK(unp);
1084 return (0);
1085}
1086
1087static struct pr_usrreqs uipc_usrreqs_dgram = {
1088 .pru_abort = uipc_abort,
1089 .pru_accept = uipc_accept,
1090 .pru_attach = uipc_attach,
1091 .pru_bind = uipc_bind,
1092 .pru_connect = uipc_connect,
1093 .pru_connect2 = uipc_connect2,
1094 .pru_detach = uipc_detach,
1095 .pru_disconnect = uipc_disconnect,
1096 .pru_listen = uipc_listen,
1097 .pru_peeraddr = uipc_peeraddr,
1098 .pru_rcvd = uipc_rcvd,
1099 .pru_send = uipc_send,
1100 .pru_sense = uipc_sense,
1101 .pru_shutdown = uipc_shutdown,
1102 .pru_sockaddr = uipc_sockaddr,
1103 .pru_soreceive = soreceive_dgram,
1104 .pru_close = uipc_close,
1105};
1106
1107static struct pr_usrreqs uipc_usrreqs_seqpacket = {
1108 .pru_abort = uipc_abort,
1109 .pru_accept = uipc_accept,
1110 .pru_attach = uipc_attach,
1111 .pru_bind = uipc_bind,
1112 .pru_connect = uipc_connect,
1113 .pru_connect2 = uipc_connect2,
1114 .pru_detach = uipc_detach,
1115 .pru_disconnect = uipc_disconnect,
1116 .pru_listen = uipc_listen,
1117 .pru_peeraddr = uipc_peeraddr,
1118 .pru_rcvd = uipc_rcvd,
1119 .pru_send = uipc_send,
1120 .pru_sense = uipc_sense,
1121 .pru_shutdown = uipc_shutdown,
1122 .pru_sockaddr = uipc_sockaddr,
1123 .pru_soreceive = soreceive_generic, /* XXX: or...? */
1124 .pru_close = uipc_close,
1125};
1126
1127static struct pr_usrreqs uipc_usrreqs_stream = {
1128 .pru_abort = uipc_abort,
1129 .pru_accept = uipc_accept,
1130 .pru_attach = uipc_attach,
1131 .pru_bind = uipc_bind,
1132 .pru_connect = uipc_connect,
1133 .pru_connect2 = uipc_connect2,
1134 .pru_detach = uipc_detach,
1135 .pru_disconnect = uipc_disconnect,
1136 .pru_listen = uipc_listen,
1137 .pru_peeraddr = uipc_peeraddr,
1138 .pru_rcvd = uipc_rcvd,
1139 .pru_send = uipc_send,
1140 .pru_sense = uipc_sense,
1141 .pru_shutdown = uipc_shutdown,
1142 .pru_sockaddr = uipc_sockaddr,
1143 .pru_soreceive = soreceive_generic,
1144 .pru_close = uipc_close,
1145};
1146
1147static int
1148uipc_ctloutput(struct socket *so, struct sockopt *sopt)
1149{
1150 struct unpcb *unp;
1151 struct xucred xu;
1152 int error, optval;
1153
1154 if (sopt->sopt_level != 0)
1155 return (EINVAL);
1156
1157 unp = sotounpcb(so);
1158 KASSERT(unp != NULL, ("uipc_ctloutput: unp == NULL"));
1159 error = 0;
1160 switch (sopt->sopt_dir) {
1161 case SOPT_GET:
1162 switch (sopt->sopt_name) {
1163 case LOCAL_PEERCRED:
1164 UNP_PCB_LOCK(unp);
1165 if (unp->unp_flags & UNP_HAVEPC)
1166 xu = unp->unp_peercred;
1167 else {
1168 if (so->so_type == SOCK_STREAM)
1169 error = ENOTCONN;
1170 else
1171 error = EINVAL;
1172 }
1173 UNP_PCB_UNLOCK(unp);
1174 if (error == 0)
1175 error = sooptcopyout(sopt, &xu, sizeof(xu));
1176 break;
1177
1178 case LOCAL_CREDS:
1179 /* Unlocked read. */
1180 optval = unp->unp_flags & UNP_WANTCRED ? 1 : 0;
1181 error = sooptcopyout(sopt, &optval, sizeof(optval));
1182 break;
1183
1184 case LOCAL_CONNWAIT:
1185 /* Unlocked read. */
1186 optval = unp->unp_flags & UNP_CONNWAIT ? 1 : 0;
1187 error = sooptcopyout(sopt, &optval, sizeof(optval));
1188 break;
1189
1190 default:
1191 error = EOPNOTSUPP;
1192 break;
1193 }
1194 break;
1195
1196 case SOPT_SET:
1197 switch (sopt->sopt_name) {
1198 case LOCAL_CREDS:
1199 case LOCAL_CONNWAIT:
1200 error = sooptcopyin(sopt, &optval, sizeof(optval),
1201 sizeof(optval));
1202 if (error)
1203 break;
1204
1205#define OPTSET(bit) do { \
1206 UNP_PCB_LOCK(unp); \
1207 if (optval) \
1208 unp->unp_flags |= bit; \
1209 else \
1210 unp->unp_flags &= ~bit; \
1211 UNP_PCB_UNLOCK(unp); \
1212} while (0)
1213
1214 switch (sopt->sopt_name) {
1215 case LOCAL_CREDS:
1216 OPTSET(UNP_WANTCRED);
1217 break;
1218
1219 case LOCAL_CONNWAIT:
1220 OPTSET(UNP_CONNWAIT);
1221 break;
1222
1223 default:
1224 break;
1225 }
1226 break;
1227#undef OPTSET
1228 default:
1229 error = ENOPROTOOPT;
1230 break;
1231 }
1232 break;
1233
1234 default:
1235 error = EOPNOTSUPP;
1236 break;
1237 }
1238 return (error);
1239}
1240
1241static int
1242unp_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1243{
1244 struct sockaddr_un *soun = (struct sockaddr_un *)nam;
1245 struct vnode *vp;
1246 struct socket *so2, *so3;
1247 struct unpcb *unp, *unp2, *unp3;
1248 int error, len, vfslocked;
1249 struct nameidata nd;
1250 char buf[SOCK_MAXADDRLEN];
1251 struct sockaddr *sa;
1252
1253 UNP_LINK_WLOCK_ASSERT();
1254
1255 unp = sotounpcb(so);
1256 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1257
1258 if (nam->sa_len > sizeof(struct sockaddr_un))
1259 return (EINVAL);
1260 len = nam->sa_len - offsetof(struct sockaddr_un, sun_path);
1261 if (len <= 0)
1262 return (EINVAL);
1263 bcopy(soun->sun_path, buf, len);
1264 buf[len] = 0;
1265
1266 UNP_PCB_LOCK(unp);
1267 if (unp->unp_flags & UNP_CONNECTING) {
1268 UNP_PCB_UNLOCK(unp);
1269 return (EALREADY);
1270 }
1271 UNP_LINK_WUNLOCK();
1272 unp->unp_flags |= UNP_CONNECTING;
1273 UNP_PCB_UNLOCK(unp);
1274
1275 sa = malloc(sizeof(struct sockaddr_un), M_SONAME, M_WAITOK);
1276 NDINIT(&nd, LOOKUP, MPSAFE | FOLLOW | LOCKSHARED | LOCKLEAF,
1277 UIO_SYSSPACE, buf, td);
1278 error = namei(&nd);
1279 if (error)
1280 vp = NULL;
1281 else
1282 vp = nd.ni_vp;
1283 ASSERT_VOP_LOCKED(vp, "unp_connect");
1284 vfslocked = NDHASGIANT(&nd);
1285 NDFREE(&nd, NDF_ONLY_PNBUF);
1286 if (error)
1287 goto bad;
1288
1289 if (vp->v_type != VSOCK) {
1290 error = ENOTSOCK;
1291 goto bad;
1292 }
1293#ifdef MAC
1294 error = mac_vnode_check_open(td->td_ucred, vp, VWRITE | VREAD);
1295 if (error)
1296 goto bad;
1297#endif
1298 error = VOP_ACCESS(vp, VWRITE, td->td_ucred, td);
1299 if (error)
1300 goto bad;
1301 VFS_UNLOCK_GIANT(vfslocked);
1302
1303 unp = sotounpcb(so);
1304 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1305
1306 /*
1307 * Lock linkage lock for two reasons: make sure v_socket is stable,
1308 * and to protect simultaneous locking of multiple pcbs.
1309 */
1310 UNP_LINK_WLOCK();
|
1311 so2 = vp->v_socket;
| 1311 VOP_UNP_CONNECT(vp, &so2);
|
1312 if (so2 == NULL) {
1313 error = ECONNREFUSED;
1314 goto bad2;
1315 }
1316 if (so->so_type != so2->so_type) {
1317 error = EPROTOTYPE;
1318 goto bad2;
1319 }
1320 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1321 if (so2->so_options & SO_ACCEPTCONN) {
1322 CURVNET_SET(so2->so_vnet);
1323 so3 = sonewconn(so2, 0);
1324 CURVNET_RESTORE();
1325 } else
1326 so3 = NULL;
1327 if (so3 == NULL) {
1328 error = ECONNREFUSED;
1329 goto bad2;
1330 }
1331 unp = sotounpcb(so);
1332 unp2 = sotounpcb(so2);
1333 unp3 = sotounpcb(so3);
1334 UNP_PCB_LOCK(unp);
1335 UNP_PCB_LOCK(unp2);
1336 UNP_PCB_LOCK(unp3);
1337 if (unp2->unp_addr != NULL) {
1338 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1339 unp3->unp_addr = (struct sockaddr_un *) sa;
1340 sa = NULL;
1341 }
1342
1343 /*
1344 * The connecter's (client's) credentials are copied from its
1345 * process structure at the time of connect() (which is now).
1346 */
1347 cru2x(td->td_ucred, &unp3->unp_peercred);
1348 unp3->unp_flags |= UNP_HAVEPC;
1349
1350 /*
1351 * The receiver's (server's) credentials are copied from the
1352 * unp_peercred member of socket on which the former called
1353 * listen(); uipc_listen() cached that process's credentials
1354 * at that time so we can use them now.
1355 */
1356 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1357 ("unp_connect: listener without cached peercred"));
1358 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1359 sizeof(unp->unp_peercred));
1360 unp->unp_flags |= UNP_HAVEPC;
1361 if (unp2->unp_flags & UNP_WANTCRED)
1362 unp3->unp_flags |= UNP_WANTCRED;
1363 UNP_PCB_UNLOCK(unp3);
1364 UNP_PCB_UNLOCK(unp2);
1365 UNP_PCB_UNLOCK(unp);
1366#ifdef MAC
1367 mac_socketpeer_set_from_socket(so, so3);
1368 mac_socketpeer_set_from_socket(so3, so);
1369#endif
1370
1371 so2 = so3;
1372 }
1373 unp = sotounpcb(so);
1374 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1375 unp2 = sotounpcb(so2);
1376 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1377 UNP_PCB_LOCK(unp);
1378 UNP_PCB_LOCK(unp2);
1379 error = unp_connect2(so, so2, PRU_CONNECT);
1380 UNP_PCB_UNLOCK(unp2);
1381 UNP_PCB_UNLOCK(unp);
1382bad2:
1383 UNP_LINK_WUNLOCK();
1384 if (vfslocked)
1385 /*
1386 * Giant has been previously acquired. This means filesystem
1387 * isn't MPSAFE. Do it once again.
1388 */
1389 mtx_lock(&Giant);
1390bad:
1391 if (vp != NULL)
1392 vput(vp);
1393 VFS_UNLOCK_GIANT(vfslocked);
1394 free(sa, M_SONAME);
1395 UNP_LINK_WLOCK();
1396 UNP_PCB_LOCK(unp);
1397 unp->unp_flags &= ~UNP_CONNECTING;
1398 UNP_PCB_UNLOCK(unp);
1399 return (error);
1400}
1401
1402static int
1403unp_connect2(struct socket *so, struct socket *so2, int req)
1404{
1405 struct unpcb *unp;
1406 struct unpcb *unp2;
1407
1408 unp = sotounpcb(so);
1409 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1410 unp2 = sotounpcb(so2);
1411 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1412
1413 UNP_LINK_WLOCK_ASSERT();
1414 UNP_PCB_LOCK_ASSERT(unp);
1415 UNP_PCB_LOCK_ASSERT(unp2);
1416
1417 if (so2->so_type != so->so_type)
1418 return (EPROTOTYPE);
1419 unp->unp_conn = unp2;
1420
1421 switch (so->so_type) {
1422 case SOCK_DGRAM:
1423 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1424 soisconnected(so);
1425 break;
1426
1427 case SOCK_STREAM:
1428 case SOCK_SEQPACKET:
1429 unp2->unp_conn = unp;
1430 if (req == PRU_CONNECT &&
1431 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1432 soisconnecting(so);
1433 else
1434 soisconnected(so);
1435 soisconnected(so2);
1436 break;
1437
1438 default:
1439 panic("unp_connect2");
1440 }
1441 return (0);
1442}
1443
1444static void
1445unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1446{
1447 struct socket *so;
1448
1449 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1450
1451 UNP_LINK_WLOCK_ASSERT();
1452 UNP_PCB_LOCK_ASSERT(unp);
1453 UNP_PCB_LOCK_ASSERT(unp2);
1454
1455 unp->unp_conn = NULL;
1456 switch (unp->unp_socket->so_type) {
1457 case SOCK_DGRAM:
1458 LIST_REMOVE(unp, unp_reflink);
1459 so = unp->unp_socket;
1460 SOCK_LOCK(so);
1461 so->so_state &= ~SS_ISCONNECTED;
1462 SOCK_UNLOCK(so);
1463 break;
1464
1465 case SOCK_STREAM:
1466 case SOCK_SEQPACKET:
1467 soisdisconnected(unp->unp_socket);
1468 unp2->unp_conn = NULL;
1469 soisdisconnected(unp2->unp_socket);
1470 break;
1471 }
1472}
1473
1474/*
1475 * unp_pcblist() walks the global list of struct unpcb's to generate a
1476 * pointer list, bumping the refcount on each unpcb. It then copies them out
1477 * sequentially, validating the generation number on each to see if it has
1478 * been detached. All of this is necessary because copyout() may sleep on
1479 * disk I/O.
1480 */
1481static int
1482unp_pcblist(SYSCTL_HANDLER_ARGS)
1483{
1484 int error, i, n;
1485 int freeunp;
1486 struct unpcb *unp, **unp_list;
1487 unp_gen_t gencnt;
1488 struct xunpgen *xug;
1489 struct unp_head *head;
1490 struct xunpcb *xu;
1491
1492 switch ((intptr_t)arg1) {
1493 case SOCK_STREAM:
1494 head = &unp_shead;
1495 break;
1496
1497 case SOCK_DGRAM:
1498 head = &unp_dhead;
1499 break;
1500
1501 case SOCK_SEQPACKET:
1502 head = &unp_sphead;
1503 break;
1504
1505 default:
1506 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1507 }
1508
1509 /*
1510 * The process of preparing the PCB list is too time-consuming and
1511 * resource-intensive to repeat twice on every request.
1512 */
1513 if (req->oldptr == NULL) {
1514 n = unp_count;
1515 req->oldidx = 2 * (sizeof *xug)
1516 + (n + n/8) * sizeof(struct xunpcb);
1517 return (0);
1518 }
1519
1520 if (req->newptr != NULL)
1521 return (EPERM);
1522
1523 /*
1524 * OK, now we're committed to doing something.
1525 */
1526 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1527 UNP_LIST_LOCK();
1528 gencnt = unp_gencnt;
1529 n = unp_count;
1530 UNP_LIST_UNLOCK();
1531
1532 xug->xug_len = sizeof *xug;
1533 xug->xug_count = n;
1534 xug->xug_gen = gencnt;
1535 xug->xug_sogen = so_gencnt;
1536 error = SYSCTL_OUT(req, xug, sizeof *xug);
1537 if (error) {
1538 free(xug, M_TEMP);
1539 return (error);
1540 }
1541
1542 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1543
1544 UNP_LIST_LOCK();
1545 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1546 unp = LIST_NEXT(unp, unp_link)) {
1547 UNP_PCB_LOCK(unp);
1548 if (unp->unp_gencnt <= gencnt) {
1549 if (cr_cansee(req->td->td_ucred,
1550 unp->unp_socket->so_cred)) {
1551 UNP_PCB_UNLOCK(unp);
1552 continue;
1553 }
1554 unp_list[i++] = unp;
1555 unp->unp_refcount++;
1556 }
1557 UNP_PCB_UNLOCK(unp);
1558 }
1559 UNP_LIST_UNLOCK();
1560 n = i; /* In case we lost some during malloc. */
1561
1562 error = 0;
1563 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1564 for (i = 0; i < n; i++) {
1565 unp = unp_list[i];
1566 UNP_PCB_LOCK(unp);
1567 unp->unp_refcount--;
1568 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1569 xu->xu_len = sizeof *xu;
1570 xu->xu_unpp = unp;
1571 /*
1572 * XXX - need more locking here to protect against
1573 * connect/disconnect races for SMP.
1574 */
1575 if (unp->unp_addr != NULL)
1576 bcopy(unp->unp_addr, &xu->xu_addr,
1577 unp->unp_addr->sun_len);
1578 if (unp->unp_conn != NULL &&
1579 unp->unp_conn->unp_addr != NULL)
1580 bcopy(unp->unp_conn->unp_addr,
1581 &xu->xu_caddr,
1582 unp->unp_conn->unp_addr->sun_len);
1583 bcopy(unp, &xu->xu_unp, sizeof *unp);
1584 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1585 UNP_PCB_UNLOCK(unp);
1586 error = SYSCTL_OUT(req, xu, sizeof *xu);
1587 } else {
1588 freeunp = (unp->unp_refcount == 0);
1589 UNP_PCB_UNLOCK(unp);
1590 if (freeunp) {
1591 UNP_PCB_LOCK_DESTROY(unp);
1592 uma_zfree(unp_zone, unp);
1593 }
1594 }
1595 }
1596 free(xu, M_TEMP);
1597 if (!error) {
1598 /*
1599 * Give the user an updated idea of our state. If the
1600 * generation differs from what we told her before, she knows
1601 * that something happened while we were processing this
1602 * request, and it might be necessary to retry.
1603 */
1604 xug->xug_gen = unp_gencnt;
1605 xug->xug_sogen = so_gencnt;
1606 xug->xug_count = unp_count;
1607 error = SYSCTL_OUT(req, xug, sizeof *xug);
1608 }
1609 free(unp_list, M_TEMP);
1610 free(xug, M_TEMP);
1611 return (error);
1612}
1613
1614SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1615 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1616 "List of active local datagram sockets");
1617SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1618 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1619 "List of active local stream sockets");
1620SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1621 CTLTYPE_OPAQUE | CTLFLAG_RD,
1622 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1623 "List of active local seqpacket sockets");
1624
1625static void
1626unp_shutdown(struct unpcb *unp)
1627{
1628 struct unpcb *unp2;
1629 struct socket *so;
1630
1631 UNP_LINK_WLOCK_ASSERT();
1632 UNP_PCB_LOCK_ASSERT(unp);
1633
1634 unp2 = unp->unp_conn;
1635 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1636 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1637 so = unp2->unp_socket;
1638 if (so != NULL)
1639 socantrcvmore(so);
1640 }
1641}
1642
1643static void
1644unp_drop(struct unpcb *unp, int errno)
1645{
1646 struct socket *so = unp->unp_socket;
1647 struct unpcb *unp2;
1648
1649 UNP_LINK_WLOCK_ASSERT();
1650 UNP_PCB_LOCK_ASSERT(unp);
1651
1652 so->so_error = errno;
1653 unp2 = unp->unp_conn;
1654 if (unp2 == NULL)
1655 return;
1656 UNP_PCB_LOCK(unp2);
1657 unp_disconnect(unp, unp2);
1658 UNP_PCB_UNLOCK(unp2);
1659}
1660
1661static void
1662unp_freerights(struct file **rp, int fdcount)
1663{
1664 int i;
1665 struct file *fp;
1666
1667 for (i = 0; i < fdcount; i++) {
1668 fp = *rp;
1669 *rp++ = NULL;
1670 unp_discard(fp);
1671 }
1672}
1673
1674static int
1675unp_externalize(struct mbuf *control, struct mbuf **controlp)
1676{
1677 struct thread *td = curthread; /* XXX */
1678 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1679 int i;
1680 int *fdp;
1681 struct file **rp;
1682 struct file *fp;
1683 void *data;
1684 socklen_t clen = control->m_len, datalen;
1685 int error, newfds;
1686 int f;
1687 u_int newlen;
1688
1689 UNP_LINK_UNLOCK_ASSERT();
1690
1691 error = 0;
1692 if (controlp != NULL) /* controlp == NULL => free control messages */
1693 *controlp = NULL;
1694 while (cm != NULL) {
1695 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1696 error = EINVAL;
1697 break;
1698 }
1699 data = CMSG_DATA(cm);
1700 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1701 if (cm->cmsg_level == SOL_SOCKET
1702 && cm->cmsg_type == SCM_RIGHTS) {
1703 newfds = datalen / sizeof(struct file *);
1704 rp = data;
1705
1706 /* If we're not outputting the descriptors free them. */
1707 if (error || controlp == NULL) {
1708 unp_freerights(rp, newfds);
1709 goto next;
1710 }
1711 FILEDESC_XLOCK(td->td_proc->p_fd);
1712 /* if the new FD's will not fit free them. */
1713 if (!fdavail(td, newfds)) {
1714 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1715 error = EMSGSIZE;
1716 unp_freerights(rp, newfds);
1717 goto next;
1718 }
1719
1720 /*
1721 * Now change each pointer to an fd in the global
1722 * table to an integer that is the index to the local
1723 * fd table entry that we set up to point to the
1724 * global one we are transferring.
1725 */
1726 newlen = newfds * sizeof(int);
1727 *controlp = sbcreatecontrol(NULL, newlen,
1728 SCM_RIGHTS, SOL_SOCKET);
1729 if (*controlp == NULL) {
1730 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1731 error = E2BIG;
1732 unp_freerights(rp, newfds);
1733 goto next;
1734 }
1735
1736 fdp = (int *)
1737 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1738 for (i = 0; i < newfds; i++) {
1739 if (fdalloc(td, 0, &f))
1740 panic("unp_externalize fdalloc failed");
1741 fp = *rp++;
1742 td->td_proc->p_fd->fd_ofiles[f] = fp;
1743 unp_externalize_fp(fp);
1744 *fdp++ = f;
1745 }
1746 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1747 } else {
1748 /* We can just copy anything else across. */
1749 if (error || controlp == NULL)
1750 goto next;
1751 *controlp = sbcreatecontrol(NULL, datalen,
1752 cm->cmsg_type, cm->cmsg_level);
1753 if (*controlp == NULL) {
1754 error = ENOBUFS;
1755 goto next;
1756 }
1757 bcopy(data,
1758 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1759 datalen);
1760 }
1761 controlp = &(*controlp)->m_next;
1762
1763next:
1764 if (CMSG_SPACE(datalen) < clen) {
1765 clen -= CMSG_SPACE(datalen);
1766 cm = (struct cmsghdr *)
1767 ((caddr_t)cm + CMSG_SPACE(datalen));
1768 } else {
1769 clen = 0;
1770 cm = NULL;
1771 }
1772 }
1773
1774 m_freem(control);
1775 return (error);
1776}
1777
1778static void
1779unp_zone_change(void *tag)
1780{
1781
1782 uma_zone_set_max(unp_zone, maxsockets);
1783}
1784
1785static void
1786unp_init(void)
1787{
1788
1789#ifdef VIMAGE
1790 if (!IS_DEFAULT_VNET(curvnet))
1791 return;
1792#endif
1793 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1794 NULL, NULL, UMA_ALIGN_PTR, 0);
1795 if (unp_zone == NULL)
1796 panic("unp_init");
1797 uma_zone_set_max(unp_zone, maxsockets);
1798 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1799 NULL, EVENTHANDLER_PRI_ANY);
1800 LIST_INIT(&unp_dhead);
1801 LIST_INIT(&unp_shead);
1802 LIST_INIT(&unp_sphead);
1803 SLIST_INIT(&unp_defers);
1804 TASK_INIT(&unp_gc_task, 0, unp_gc, NULL);
1805 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1806 UNP_LINK_LOCK_INIT();
1807 UNP_LIST_LOCK_INIT();
1808 UNP_DEFERRED_LOCK_INIT();
1809}
1810
1811static int
1812unp_internalize(struct mbuf **controlp, struct thread *td)
1813{
1814 struct mbuf *control = *controlp;
1815 struct proc *p = td->td_proc;
1816 struct filedesc *fdescp = p->p_fd;
1817 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1818 struct cmsgcred *cmcred;
1819 struct file **rp;
1820 struct file *fp;
1821 struct timeval *tv;
1822 int i, fd, *fdp;
1823 void *data;
1824 socklen_t clen = control->m_len, datalen;
1825 int error, oldfds;
1826 u_int newlen;
1827
1828 UNP_LINK_UNLOCK_ASSERT();
1829
1830 error = 0;
1831 *controlp = NULL;
1832 while (cm != NULL) {
1833 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1834 || cm->cmsg_len > clen) {
1835 error = EINVAL;
1836 goto out;
1837 }
1838 data = CMSG_DATA(cm);
1839 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1840
1841 switch (cm->cmsg_type) {
1842 /*
1843 * Fill in credential information.
1844 */
1845 case SCM_CREDS:
1846 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1847 SCM_CREDS, SOL_SOCKET);
1848 if (*controlp == NULL) {
1849 error = ENOBUFS;
1850 goto out;
1851 }
1852 cmcred = (struct cmsgcred *)
1853 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1854 cmcred->cmcred_pid = p->p_pid;
1855 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1856 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1857 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1858 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1859 CMGROUP_MAX);
1860 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1861 cmcred->cmcred_groups[i] =
1862 td->td_ucred->cr_groups[i];
1863 break;
1864
1865 case SCM_RIGHTS:
1866 oldfds = datalen / sizeof (int);
1867 /*
1868 * Check that all the FDs passed in refer to legal
1869 * files. If not, reject the entire operation.
1870 */
1871 fdp = data;
1872 FILEDESC_SLOCK(fdescp);
1873 for (i = 0; i < oldfds; i++) {
1874 fd = *fdp++;
1875 if ((unsigned)fd >= fdescp->fd_nfiles ||
1876 fdescp->fd_ofiles[fd] == NULL) {
1877 FILEDESC_SUNLOCK(fdescp);
1878 error = EBADF;
1879 goto out;
1880 }
1881 fp = fdescp->fd_ofiles[fd];
1882 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1883 FILEDESC_SUNLOCK(fdescp);
1884 error = EOPNOTSUPP;
1885 goto out;
1886 }
1887
1888 }
1889
1890 /*
1891 * Now replace the integer FDs with pointers to the
1892 * associated global file table entry..
1893 */
1894 newlen = oldfds * sizeof(struct file *);
1895 *controlp = sbcreatecontrol(NULL, newlen,
1896 SCM_RIGHTS, SOL_SOCKET);
1897 if (*controlp == NULL) {
1898 FILEDESC_SUNLOCK(fdescp);
1899 error = E2BIG;
1900 goto out;
1901 }
1902 fdp = data;
1903 rp = (struct file **)
1904 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1905 for (i = 0; i < oldfds; i++) {
1906 fp = fdescp->fd_ofiles[*fdp++];
1907 *rp++ = fp;
1908 unp_internalize_fp(fp);
1909 }
1910 FILEDESC_SUNLOCK(fdescp);
1911 break;
1912
1913 case SCM_TIMESTAMP:
1914 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1915 SCM_TIMESTAMP, SOL_SOCKET);
1916 if (*controlp == NULL) {
1917 error = ENOBUFS;
1918 goto out;
1919 }
1920 tv = (struct timeval *)
1921 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1922 microtime(tv);
1923 break;
1924
1925 default:
1926 error = EINVAL;
1927 goto out;
1928 }
1929
1930 controlp = &(*controlp)->m_next;
1931 if (CMSG_SPACE(datalen) < clen) {
1932 clen -= CMSG_SPACE(datalen);
1933 cm = (struct cmsghdr *)
1934 ((caddr_t)cm + CMSG_SPACE(datalen));
1935 } else {
1936 clen = 0;
1937 cm = NULL;
1938 }
1939 }
1940
1941out:
1942 m_freem(control);
1943 return (error);
1944}
1945
1946static struct mbuf *
1947unp_addsockcred(struct thread *td, struct mbuf *control)
1948{
1949 struct mbuf *m, *n, *n_prev;
1950 struct sockcred *sc;
1951 const struct cmsghdr *cm;
1952 int ngroups;
1953 int i;
1954
1955 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
1956 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
1957 if (m == NULL)
1958 return (control);
1959
1960 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
1961 sc->sc_uid = td->td_ucred->cr_ruid;
1962 sc->sc_euid = td->td_ucred->cr_uid;
1963 sc->sc_gid = td->td_ucred->cr_rgid;
1964 sc->sc_egid = td->td_ucred->cr_gid;
1965 sc->sc_ngroups = ngroups;
1966 for (i = 0; i < sc->sc_ngroups; i++)
1967 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
1968
1969 /*
1970 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
1971 * created SCM_CREDS control message (struct sockcred) has another
1972 * format.
1973 */
1974 if (control != NULL)
1975 for (n = control, n_prev = NULL; n != NULL;) {
1976 cm = mtod(n, struct cmsghdr *);
1977 if (cm->cmsg_level == SOL_SOCKET &&
1978 cm->cmsg_type == SCM_CREDS) {
1979 if (n_prev == NULL)
1980 control = n->m_next;
1981 else
1982 n_prev->m_next = n->m_next;
1983 n = m_free(n);
1984 } else {
1985 n_prev = n;
1986 n = n->m_next;
1987 }
1988 }
1989
1990 /* Prepend it to the head. */
1991 m->m_next = control;
1992 return (m);
1993}
1994
1995static struct unpcb *
1996fptounp(struct file *fp)
1997{
1998 struct socket *so;
1999
2000 if (fp->f_type != DTYPE_SOCKET)
2001 return (NULL);
2002 if ((so = fp->f_data) == NULL)
2003 return (NULL);
2004 if (so->so_proto->pr_domain != &localdomain)
2005 return (NULL);
2006 return sotounpcb(so);
2007}
2008
2009static void
2010unp_discard(struct file *fp)
2011{
2012 struct unp_defer *dr;
2013
2014 if (unp_externalize_fp(fp)) {
2015 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2016 dr->ud_fp = fp;
2017 UNP_DEFERRED_LOCK();
2018 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2019 UNP_DEFERRED_UNLOCK();
2020 atomic_add_int(&unp_defers_count, 1);
2021 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2022 } else
2023 (void) closef(fp, (struct thread *)NULL);
2024}
2025
2026static void
2027unp_process_defers(void *arg __unused, int pending)
2028{
2029 struct unp_defer *dr;
2030 SLIST_HEAD(, unp_defer) drl;
2031 int count;
2032
2033 SLIST_INIT(&drl);
2034 for (;;) {
2035 UNP_DEFERRED_LOCK();
2036 if (SLIST_FIRST(&unp_defers) == NULL) {
2037 UNP_DEFERRED_UNLOCK();
2038 break;
2039 }
2040 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2041 UNP_DEFERRED_UNLOCK();
2042 count = 0;
2043 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2044 SLIST_REMOVE_HEAD(&drl, ud_link);
2045 closef(dr->ud_fp, NULL);
2046 free(dr, M_TEMP);
2047 count++;
2048 }
2049 atomic_add_int(&unp_defers_count, -count);
2050 }
2051}
2052
2053static void
2054unp_internalize_fp(struct file *fp)
2055{
2056 struct unpcb *unp;
2057
2058 UNP_LINK_WLOCK();
2059 if ((unp = fptounp(fp)) != NULL) {
2060 unp->unp_file = fp;
2061 unp->unp_msgcount++;
2062 }
2063 fhold(fp);
2064 unp_rights++;
2065 UNP_LINK_WUNLOCK();
2066}
2067
2068static int
2069unp_externalize_fp(struct file *fp)
2070{
2071 struct unpcb *unp;
2072 int ret;
2073
2074 UNP_LINK_WLOCK();
2075 if ((unp = fptounp(fp)) != NULL) {
2076 unp->unp_msgcount--;
2077 ret = 1;
2078 } else
2079 ret = 0;
2080 unp_rights--;
2081 UNP_LINK_WUNLOCK();
2082 return (ret);
2083}
2084
2085/*
2086 * unp_defer indicates whether additional work has been defered for a future
2087 * pass through unp_gc(). It is thread local and does not require explicit
2088 * synchronization.
2089 */
2090static int unp_marked;
2091static int unp_unreachable;
2092
2093static void
2094unp_accessable(struct file *fp)
2095{
2096 struct unpcb *unp;
2097
2098 if ((unp = fptounp(fp)) == NULL)
2099 return;
2100 if (unp->unp_gcflag & UNPGC_REF)
2101 return;
2102 unp->unp_gcflag &= ~UNPGC_DEAD;
2103 unp->unp_gcflag |= UNPGC_REF;
2104 unp_marked++;
2105}
2106
2107static void
2108unp_gc_process(struct unpcb *unp)
2109{
2110 struct socket *soa;
2111 struct socket *so;
2112 struct file *fp;
2113
2114 /* Already processed. */
2115 if (unp->unp_gcflag & UNPGC_SCANNED)
2116 return;
2117 fp = unp->unp_file;
2118
2119 /*
2120 * Check for a socket potentially in a cycle. It must be in a
2121 * queue as indicated by msgcount, and this must equal the file
2122 * reference count. Note that when msgcount is 0 the file is NULL.
2123 */
2124 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2125 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2126 unp->unp_gcflag |= UNPGC_DEAD;
2127 unp_unreachable++;
2128 return;
2129 }
2130
2131 /*
2132 * Mark all sockets we reference with RIGHTS.
2133 */
2134 so = unp->unp_socket;
2135 SOCKBUF_LOCK(&so->so_rcv);
2136 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2137 SOCKBUF_UNLOCK(&so->so_rcv);
2138
2139 /*
2140 * Mark all sockets in our accept queue.
2141 */
2142 ACCEPT_LOCK();
2143 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2144 SOCKBUF_LOCK(&soa->so_rcv);
2145 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2146 SOCKBUF_UNLOCK(&soa->so_rcv);
2147 }
2148 ACCEPT_UNLOCK();
2149 unp->unp_gcflag |= UNPGC_SCANNED;
2150}
2151
2152static int unp_recycled;
2153SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2154 "Number of unreachable sockets claimed by the garbage collector.");
2155
2156static int unp_taskcount;
2157SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2158 "Number of times the garbage collector has run.");
2159
2160static void
2161unp_gc(__unused void *arg, int pending)
2162{
2163 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2164 NULL };
2165 struct unp_head **head;
2166 struct file *f, **unref;
2167 struct unpcb *unp;
2168 int i, total;
2169
2170 unp_taskcount++;
2171 UNP_LIST_LOCK();
2172 /*
2173 * First clear all gc flags from previous runs.
2174 */
2175 for (head = heads; *head != NULL; head++)
2176 LIST_FOREACH(unp, *head, unp_link)
2177 unp->unp_gcflag = 0;
2178
2179 /*
2180 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2181 * is reachable all of the sockets it references are reachable.
2182 * Stop the scan once we do a complete loop without discovering
2183 * a new reachable socket.
2184 */
2185 do {
2186 unp_unreachable = 0;
2187 unp_marked = 0;
2188 for (head = heads; *head != NULL; head++)
2189 LIST_FOREACH(unp, *head, unp_link)
2190 unp_gc_process(unp);
2191 } while (unp_marked);
2192 UNP_LIST_UNLOCK();
2193 if (unp_unreachable == 0)
2194 return;
2195
2196 /*
2197 * Allocate space for a local list of dead unpcbs.
2198 */
2199 unref = malloc(unp_unreachable * sizeof(struct file *),
2200 M_TEMP, M_WAITOK);
2201
2202 /*
2203 * Iterate looking for sockets which have been specifically marked
2204 * as as unreachable and store them locally.
2205 */
2206 UNP_LINK_RLOCK();
2207 UNP_LIST_LOCK();
2208 for (total = 0, head = heads; *head != NULL; head++)
2209 LIST_FOREACH(unp, *head, unp_link)
2210 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2211 f = unp->unp_file;
2212 if (unp->unp_msgcount == 0 || f == NULL ||
2213 f->f_count != unp->unp_msgcount)
2214 continue;
2215 unref[total++] = f;
2216 fhold(f);
2217 KASSERT(total <= unp_unreachable,
2218 ("unp_gc: incorrect unreachable count."));
2219 }
2220 UNP_LIST_UNLOCK();
2221 UNP_LINK_RUNLOCK();
2222
2223 /*
2224 * Now flush all sockets, free'ing rights. This will free the
2225 * struct files associated with these sockets but leave each socket
2226 * with one remaining ref.
2227 */
2228 for (i = 0; i < total; i++) {
2229 struct socket *so;
2230
2231 so = unref[i]->f_data;
2232 CURVNET_SET(so->so_vnet);
2233 sorflush(so);
2234 CURVNET_RESTORE();
2235 }
2236
2237 /*
2238 * And finally release the sockets so they can be reclaimed.
2239 */
2240 for (i = 0; i < total; i++)
2241 fdrop(unref[i], NULL);
2242 unp_recycled += total;
2243 free(unref, M_TEMP);
2244}
2245
2246static void
2247unp_dispose(struct mbuf *m)
2248{
2249
2250 if (m)
2251 unp_scan(m, unp_discard);
2252}
2253
2254static void
2255unp_scan(struct mbuf *m0, void (*op)(struct file *))
2256{
2257 struct mbuf *m;
2258 struct file **rp;
2259 struct cmsghdr *cm;
2260 void *data;
2261 int i;
2262 socklen_t clen, datalen;
2263 int qfds;
2264
2265 while (m0 != NULL) {
2266 for (m = m0; m; m = m->m_next) {
2267 if (m->m_type != MT_CONTROL)
2268 continue;
2269
2270 cm = mtod(m, struct cmsghdr *);
2271 clen = m->m_len;
2272
2273 while (cm != NULL) {
2274 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2275 break;
2276
2277 data = CMSG_DATA(cm);
2278 datalen = (caddr_t)cm + cm->cmsg_len
2279 - (caddr_t)data;
2280
2281 if (cm->cmsg_level == SOL_SOCKET &&
2282 cm->cmsg_type == SCM_RIGHTS) {
2283 qfds = datalen / sizeof (struct file *);
2284 rp = data;
2285 for (i = 0; i < qfds; i++)
2286 (*op)(*rp++);
2287 }
2288
2289 if (CMSG_SPACE(datalen) < clen) {
2290 clen -= CMSG_SPACE(datalen);
2291 cm = (struct cmsghdr *)
2292 ((caddr_t)cm + CMSG_SPACE(datalen));
2293 } else {
2294 clen = 0;
2295 cm = NULL;
2296 }
2297 }
2298 }
2299 m0 = m0->m_act;
2300 }
2301}
2302
2303/*
2304 * A helper function called by VFS before socket-type vnode reclamation.
2305 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2306 * use count.
2307 */
2308void
2309vfs_unp_reclaim(struct vnode *vp)
2310{
2311 struct socket *so;
2312 struct unpcb *unp;
2313 int active;
2314
2315 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2316 KASSERT(vp->v_type == VSOCK,
2317 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2318
2319 active = 0;
2320 UNP_LINK_WLOCK();
| 1312 if (so2 == NULL) {
1313 error = ECONNREFUSED;
1314 goto bad2;
1315 }
1316 if (so->so_type != so2->so_type) {
1317 error = EPROTOTYPE;
1318 goto bad2;
1319 }
1320 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
1321 if (so2->so_options & SO_ACCEPTCONN) {
1322 CURVNET_SET(so2->so_vnet);
1323 so3 = sonewconn(so2, 0);
1324 CURVNET_RESTORE();
1325 } else
1326 so3 = NULL;
1327 if (so3 == NULL) {
1328 error = ECONNREFUSED;
1329 goto bad2;
1330 }
1331 unp = sotounpcb(so);
1332 unp2 = sotounpcb(so2);
1333 unp3 = sotounpcb(so3);
1334 UNP_PCB_LOCK(unp);
1335 UNP_PCB_LOCK(unp2);
1336 UNP_PCB_LOCK(unp3);
1337 if (unp2->unp_addr != NULL) {
1338 bcopy(unp2->unp_addr, sa, unp2->unp_addr->sun_len);
1339 unp3->unp_addr = (struct sockaddr_un *) sa;
1340 sa = NULL;
1341 }
1342
1343 /*
1344 * The connecter's (client's) credentials are copied from its
1345 * process structure at the time of connect() (which is now).
1346 */
1347 cru2x(td->td_ucred, &unp3->unp_peercred);
1348 unp3->unp_flags |= UNP_HAVEPC;
1349
1350 /*
1351 * The receiver's (server's) credentials are copied from the
1352 * unp_peercred member of socket on which the former called
1353 * listen(); uipc_listen() cached that process's credentials
1354 * at that time so we can use them now.
1355 */
1356 KASSERT(unp2->unp_flags & UNP_HAVEPCCACHED,
1357 ("unp_connect: listener without cached peercred"));
1358 memcpy(&unp->unp_peercred, &unp2->unp_peercred,
1359 sizeof(unp->unp_peercred));
1360 unp->unp_flags |= UNP_HAVEPC;
1361 if (unp2->unp_flags & UNP_WANTCRED)
1362 unp3->unp_flags |= UNP_WANTCRED;
1363 UNP_PCB_UNLOCK(unp3);
1364 UNP_PCB_UNLOCK(unp2);
1365 UNP_PCB_UNLOCK(unp);
1366#ifdef MAC
1367 mac_socketpeer_set_from_socket(so, so3);
1368 mac_socketpeer_set_from_socket(so3, so);
1369#endif
1370
1371 so2 = so3;
1372 }
1373 unp = sotounpcb(so);
1374 KASSERT(unp != NULL, ("unp_connect: unp == NULL"));
1375 unp2 = sotounpcb(so2);
1376 KASSERT(unp2 != NULL, ("unp_connect: unp2 == NULL"));
1377 UNP_PCB_LOCK(unp);
1378 UNP_PCB_LOCK(unp2);
1379 error = unp_connect2(so, so2, PRU_CONNECT);
1380 UNP_PCB_UNLOCK(unp2);
1381 UNP_PCB_UNLOCK(unp);
1382bad2:
1383 UNP_LINK_WUNLOCK();
1384 if (vfslocked)
1385 /*
1386 * Giant has been previously acquired. This means filesystem
1387 * isn't MPSAFE. Do it once again.
1388 */
1389 mtx_lock(&Giant);
1390bad:
1391 if (vp != NULL)
1392 vput(vp);
1393 VFS_UNLOCK_GIANT(vfslocked);
1394 free(sa, M_SONAME);
1395 UNP_LINK_WLOCK();
1396 UNP_PCB_LOCK(unp);
1397 unp->unp_flags &= ~UNP_CONNECTING;
1398 UNP_PCB_UNLOCK(unp);
1399 return (error);
1400}
1401
1402static int
1403unp_connect2(struct socket *so, struct socket *so2, int req)
1404{
1405 struct unpcb *unp;
1406 struct unpcb *unp2;
1407
1408 unp = sotounpcb(so);
1409 KASSERT(unp != NULL, ("unp_connect2: unp == NULL"));
1410 unp2 = sotounpcb(so2);
1411 KASSERT(unp2 != NULL, ("unp_connect2: unp2 == NULL"));
1412
1413 UNP_LINK_WLOCK_ASSERT();
1414 UNP_PCB_LOCK_ASSERT(unp);
1415 UNP_PCB_LOCK_ASSERT(unp2);
1416
1417 if (so2->so_type != so->so_type)
1418 return (EPROTOTYPE);
1419 unp->unp_conn = unp2;
1420
1421 switch (so->so_type) {
1422 case SOCK_DGRAM:
1423 LIST_INSERT_HEAD(&unp2->unp_refs, unp, unp_reflink);
1424 soisconnected(so);
1425 break;
1426
1427 case SOCK_STREAM:
1428 case SOCK_SEQPACKET:
1429 unp2->unp_conn = unp;
1430 if (req == PRU_CONNECT &&
1431 ((unp->unp_flags | unp2->unp_flags) & UNP_CONNWAIT))
1432 soisconnecting(so);
1433 else
1434 soisconnected(so);
1435 soisconnected(so2);
1436 break;
1437
1438 default:
1439 panic("unp_connect2");
1440 }
1441 return (0);
1442}
1443
1444static void
1445unp_disconnect(struct unpcb *unp, struct unpcb *unp2)
1446{
1447 struct socket *so;
1448
1449 KASSERT(unp2 != NULL, ("unp_disconnect: unp2 == NULL"));
1450
1451 UNP_LINK_WLOCK_ASSERT();
1452 UNP_PCB_LOCK_ASSERT(unp);
1453 UNP_PCB_LOCK_ASSERT(unp2);
1454
1455 unp->unp_conn = NULL;
1456 switch (unp->unp_socket->so_type) {
1457 case SOCK_DGRAM:
1458 LIST_REMOVE(unp, unp_reflink);
1459 so = unp->unp_socket;
1460 SOCK_LOCK(so);
1461 so->so_state &= ~SS_ISCONNECTED;
1462 SOCK_UNLOCK(so);
1463 break;
1464
1465 case SOCK_STREAM:
1466 case SOCK_SEQPACKET:
1467 soisdisconnected(unp->unp_socket);
1468 unp2->unp_conn = NULL;
1469 soisdisconnected(unp2->unp_socket);
1470 break;
1471 }
1472}
1473
1474/*
1475 * unp_pcblist() walks the global list of struct unpcb's to generate a
1476 * pointer list, bumping the refcount on each unpcb. It then copies them out
1477 * sequentially, validating the generation number on each to see if it has
1478 * been detached. All of this is necessary because copyout() may sleep on
1479 * disk I/O.
1480 */
1481static int
1482unp_pcblist(SYSCTL_HANDLER_ARGS)
1483{
1484 int error, i, n;
1485 int freeunp;
1486 struct unpcb *unp, **unp_list;
1487 unp_gen_t gencnt;
1488 struct xunpgen *xug;
1489 struct unp_head *head;
1490 struct xunpcb *xu;
1491
1492 switch ((intptr_t)arg1) {
1493 case SOCK_STREAM:
1494 head = &unp_shead;
1495 break;
1496
1497 case SOCK_DGRAM:
1498 head = &unp_dhead;
1499 break;
1500
1501 case SOCK_SEQPACKET:
1502 head = &unp_sphead;
1503 break;
1504
1505 default:
1506 panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
1507 }
1508
1509 /*
1510 * The process of preparing the PCB list is too time-consuming and
1511 * resource-intensive to repeat twice on every request.
1512 */
1513 if (req->oldptr == NULL) {
1514 n = unp_count;
1515 req->oldidx = 2 * (sizeof *xug)
1516 + (n + n/8) * sizeof(struct xunpcb);
1517 return (0);
1518 }
1519
1520 if (req->newptr != NULL)
1521 return (EPERM);
1522
1523 /*
1524 * OK, now we're committed to doing something.
1525 */
1526 xug = malloc(sizeof(*xug), M_TEMP, M_WAITOK);
1527 UNP_LIST_LOCK();
1528 gencnt = unp_gencnt;
1529 n = unp_count;
1530 UNP_LIST_UNLOCK();
1531
1532 xug->xug_len = sizeof *xug;
1533 xug->xug_count = n;
1534 xug->xug_gen = gencnt;
1535 xug->xug_sogen = so_gencnt;
1536 error = SYSCTL_OUT(req, xug, sizeof *xug);
1537 if (error) {
1538 free(xug, M_TEMP);
1539 return (error);
1540 }
1541
1542 unp_list = malloc(n * sizeof *unp_list, M_TEMP, M_WAITOK);
1543
1544 UNP_LIST_LOCK();
1545 for (unp = LIST_FIRST(head), i = 0; unp && i < n;
1546 unp = LIST_NEXT(unp, unp_link)) {
1547 UNP_PCB_LOCK(unp);
1548 if (unp->unp_gencnt <= gencnt) {
1549 if (cr_cansee(req->td->td_ucred,
1550 unp->unp_socket->so_cred)) {
1551 UNP_PCB_UNLOCK(unp);
1552 continue;
1553 }
1554 unp_list[i++] = unp;
1555 unp->unp_refcount++;
1556 }
1557 UNP_PCB_UNLOCK(unp);
1558 }
1559 UNP_LIST_UNLOCK();
1560 n = i; /* In case we lost some during malloc. */
1561
1562 error = 0;
1563 xu = malloc(sizeof(*xu), M_TEMP, M_WAITOK | M_ZERO);
1564 for (i = 0; i < n; i++) {
1565 unp = unp_list[i];
1566 UNP_PCB_LOCK(unp);
1567 unp->unp_refcount--;
1568 if (unp->unp_refcount != 0 && unp->unp_gencnt <= gencnt) {
1569 xu->xu_len = sizeof *xu;
1570 xu->xu_unpp = unp;
1571 /*
1572 * XXX - need more locking here to protect against
1573 * connect/disconnect races for SMP.
1574 */
1575 if (unp->unp_addr != NULL)
1576 bcopy(unp->unp_addr, &xu->xu_addr,
1577 unp->unp_addr->sun_len);
1578 if (unp->unp_conn != NULL &&
1579 unp->unp_conn->unp_addr != NULL)
1580 bcopy(unp->unp_conn->unp_addr,
1581 &xu->xu_caddr,
1582 unp->unp_conn->unp_addr->sun_len);
1583 bcopy(unp, &xu->xu_unp, sizeof *unp);
1584 sotoxsocket(unp->unp_socket, &xu->xu_socket);
1585 UNP_PCB_UNLOCK(unp);
1586 error = SYSCTL_OUT(req, xu, sizeof *xu);
1587 } else {
1588 freeunp = (unp->unp_refcount == 0);
1589 UNP_PCB_UNLOCK(unp);
1590 if (freeunp) {
1591 UNP_PCB_LOCK_DESTROY(unp);
1592 uma_zfree(unp_zone, unp);
1593 }
1594 }
1595 }
1596 free(xu, M_TEMP);
1597 if (!error) {
1598 /*
1599 * Give the user an updated idea of our state. If the
1600 * generation differs from what we told her before, she knows
1601 * that something happened while we were processing this
1602 * request, and it might be necessary to retry.
1603 */
1604 xug->xug_gen = unp_gencnt;
1605 xug->xug_sogen = so_gencnt;
1606 xug->xug_count = unp_count;
1607 error = SYSCTL_OUT(req, xug, sizeof *xug);
1608 }
1609 free(unp_list, M_TEMP);
1610 free(xug, M_TEMP);
1611 return (error);
1612}
1613
1614SYSCTL_PROC(_net_local_dgram, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1615 (void *)(intptr_t)SOCK_DGRAM, 0, unp_pcblist, "S,xunpcb",
1616 "List of active local datagram sockets");
1617SYSCTL_PROC(_net_local_stream, OID_AUTO, pcblist, CTLTYPE_OPAQUE | CTLFLAG_RD,
1618 (void *)(intptr_t)SOCK_STREAM, 0, unp_pcblist, "S,xunpcb",
1619 "List of active local stream sockets");
1620SYSCTL_PROC(_net_local_seqpacket, OID_AUTO, pcblist,
1621 CTLTYPE_OPAQUE | CTLFLAG_RD,
1622 (void *)(intptr_t)SOCK_SEQPACKET, 0, unp_pcblist, "S,xunpcb",
1623 "List of active local seqpacket sockets");
1624
1625static void
1626unp_shutdown(struct unpcb *unp)
1627{
1628 struct unpcb *unp2;
1629 struct socket *so;
1630
1631 UNP_LINK_WLOCK_ASSERT();
1632 UNP_PCB_LOCK_ASSERT(unp);
1633
1634 unp2 = unp->unp_conn;
1635 if ((unp->unp_socket->so_type == SOCK_STREAM ||
1636 (unp->unp_socket->so_type == SOCK_SEQPACKET)) && unp2 != NULL) {
1637 so = unp2->unp_socket;
1638 if (so != NULL)
1639 socantrcvmore(so);
1640 }
1641}
1642
1643static void
1644unp_drop(struct unpcb *unp, int errno)
1645{
1646 struct socket *so = unp->unp_socket;
1647 struct unpcb *unp2;
1648
1649 UNP_LINK_WLOCK_ASSERT();
1650 UNP_PCB_LOCK_ASSERT(unp);
1651
1652 so->so_error = errno;
1653 unp2 = unp->unp_conn;
1654 if (unp2 == NULL)
1655 return;
1656 UNP_PCB_LOCK(unp2);
1657 unp_disconnect(unp, unp2);
1658 UNP_PCB_UNLOCK(unp2);
1659}
1660
1661static void
1662unp_freerights(struct file **rp, int fdcount)
1663{
1664 int i;
1665 struct file *fp;
1666
1667 for (i = 0; i < fdcount; i++) {
1668 fp = *rp;
1669 *rp++ = NULL;
1670 unp_discard(fp);
1671 }
1672}
1673
1674static int
1675unp_externalize(struct mbuf *control, struct mbuf **controlp)
1676{
1677 struct thread *td = curthread; /* XXX */
1678 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1679 int i;
1680 int *fdp;
1681 struct file **rp;
1682 struct file *fp;
1683 void *data;
1684 socklen_t clen = control->m_len, datalen;
1685 int error, newfds;
1686 int f;
1687 u_int newlen;
1688
1689 UNP_LINK_UNLOCK_ASSERT();
1690
1691 error = 0;
1692 if (controlp != NULL) /* controlp == NULL => free control messages */
1693 *controlp = NULL;
1694 while (cm != NULL) {
1695 if (sizeof(*cm) > clen || cm->cmsg_len > clen) {
1696 error = EINVAL;
1697 break;
1698 }
1699 data = CMSG_DATA(cm);
1700 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1701 if (cm->cmsg_level == SOL_SOCKET
1702 && cm->cmsg_type == SCM_RIGHTS) {
1703 newfds = datalen / sizeof(struct file *);
1704 rp = data;
1705
1706 /* If we're not outputting the descriptors free them. */
1707 if (error || controlp == NULL) {
1708 unp_freerights(rp, newfds);
1709 goto next;
1710 }
1711 FILEDESC_XLOCK(td->td_proc->p_fd);
1712 /* if the new FD's will not fit free them. */
1713 if (!fdavail(td, newfds)) {
1714 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1715 error = EMSGSIZE;
1716 unp_freerights(rp, newfds);
1717 goto next;
1718 }
1719
1720 /*
1721 * Now change each pointer to an fd in the global
1722 * table to an integer that is the index to the local
1723 * fd table entry that we set up to point to the
1724 * global one we are transferring.
1725 */
1726 newlen = newfds * sizeof(int);
1727 *controlp = sbcreatecontrol(NULL, newlen,
1728 SCM_RIGHTS, SOL_SOCKET);
1729 if (*controlp == NULL) {
1730 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1731 error = E2BIG;
1732 unp_freerights(rp, newfds);
1733 goto next;
1734 }
1735
1736 fdp = (int *)
1737 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1738 for (i = 0; i < newfds; i++) {
1739 if (fdalloc(td, 0, &f))
1740 panic("unp_externalize fdalloc failed");
1741 fp = *rp++;
1742 td->td_proc->p_fd->fd_ofiles[f] = fp;
1743 unp_externalize_fp(fp);
1744 *fdp++ = f;
1745 }
1746 FILEDESC_XUNLOCK(td->td_proc->p_fd);
1747 } else {
1748 /* We can just copy anything else across. */
1749 if (error || controlp == NULL)
1750 goto next;
1751 *controlp = sbcreatecontrol(NULL, datalen,
1752 cm->cmsg_type, cm->cmsg_level);
1753 if (*controlp == NULL) {
1754 error = ENOBUFS;
1755 goto next;
1756 }
1757 bcopy(data,
1758 CMSG_DATA(mtod(*controlp, struct cmsghdr *)),
1759 datalen);
1760 }
1761 controlp = &(*controlp)->m_next;
1762
1763next:
1764 if (CMSG_SPACE(datalen) < clen) {
1765 clen -= CMSG_SPACE(datalen);
1766 cm = (struct cmsghdr *)
1767 ((caddr_t)cm + CMSG_SPACE(datalen));
1768 } else {
1769 clen = 0;
1770 cm = NULL;
1771 }
1772 }
1773
1774 m_freem(control);
1775 return (error);
1776}
1777
1778static void
1779unp_zone_change(void *tag)
1780{
1781
1782 uma_zone_set_max(unp_zone, maxsockets);
1783}
1784
1785static void
1786unp_init(void)
1787{
1788
1789#ifdef VIMAGE
1790 if (!IS_DEFAULT_VNET(curvnet))
1791 return;
1792#endif
1793 unp_zone = uma_zcreate("unpcb", sizeof(struct unpcb), NULL, NULL,
1794 NULL, NULL, UMA_ALIGN_PTR, 0);
1795 if (unp_zone == NULL)
1796 panic("unp_init");
1797 uma_zone_set_max(unp_zone, maxsockets);
1798 EVENTHANDLER_REGISTER(maxsockets_change, unp_zone_change,
1799 NULL, EVENTHANDLER_PRI_ANY);
1800 LIST_INIT(&unp_dhead);
1801 LIST_INIT(&unp_shead);
1802 LIST_INIT(&unp_sphead);
1803 SLIST_INIT(&unp_defers);
1804 TASK_INIT(&unp_gc_task, 0, unp_gc, NULL);
1805 TASK_INIT(&unp_defer_task, 0, unp_process_defers, NULL);
1806 UNP_LINK_LOCK_INIT();
1807 UNP_LIST_LOCK_INIT();
1808 UNP_DEFERRED_LOCK_INIT();
1809}
1810
1811static int
1812unp_internalize(struct mbuf **controlp, struct thread *td)
1813{
1814 struct mbuf *control = *controlp;
1815 struct proc *p = td->td_proc;
1816 struct filedesc *fdescp = p->p_fd;
1817 struct cmsghdr *cm = mtod(control, struct cmsghdr *);
1818 struct cmsgcred *cmcred;
1819 struct file **rp;
1820 struct file *fp;
1821 struct timeval *tv;
1822 int i, fd, *fdp;
1823 void *data;
1824 socklen_t clen = control->m_len, datalen;
1825 int error, oldfds;
1826 u_int newlen;
1827
1828 UNP_LINK_UNLOCK_ASSERT();
1829
1830 error = 0;
1831 *controlp = NULL;
1832 while (cm != NULL) {
1833 if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET
1834 || cm->cmsg_len > clen) {
1835 error = EINVAL;
1836 goto out;
1837 }
1838 data = CMSG_DATA(cm);
1839 datalen = (caddr_t)cm + cm->cmsg_len - (caddr_t)data;
1840
1841 switch (cm->cmsg_type) {
1842 /*
1843 * Fill in credential information.
1844 */
1845 case SCM_CREDS:
1846 *controlp = sbcreatecontrol(NULL, sizeof(*cmcred),
1847 SCM_CREDS, SOL_SOCKET);
1848 if (*controlp == NULL) {
1849 error = ENOBUFS;
1850 goto out;
1851 }
1852 cmcred = (struct cmsgcred *)
1853 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1854 cmcred->cmcred_pid = p->p_pid;
1855 cmcred->cmcred_uid = td->td_ucred->cr_ruid;
1856 cmcred->cmcred_gid = td->td_ucred->cr_rgid;
1857 cmcred->cmcred_euid = td->td_ucred->cr_uid;
1858 cmcred->cmcred_ngroups = MIN(td->td_ucred->cr_ngroups,
1859 CMGROUP_MAX);
1860 for (i = 0; i < cmcred->cmcred_ngroups; i++)
1861 cmcred->cmcred_groups[i] =
1862 td->td_ucred->cr_groups[i];
1863 break;
1864
1865 case SCM_RIGHTS:
1866 oldfds = datalen / sizeof (int);
1867 /*
1868 * Check that all the FDs passed in refer to legal
1869 * files. If not, reject the entire operation.
1870 */
1871 fdp = data;
1872 FILEDESC_SLOCK(fdescp);
1873 for (i = 0; i < oldfds; i++) {
1874 fd = *fdp++;
1875 if ((unsigned)fd >= fdescp->fd_nfiles ||
1876 fdescp->fd_ofiles[fd] == NULL) {
1877 FILEDESC_SUNLOCK(fdescp);
1878 error = EBADF;
1879 goto out;
1880 }
1881 fp = fdescp->fd_ofiles[fd];
1882 if (!(fp->f_ops->fo_flags & DFLAG_PASSABLE)) {
1883 FILEDESC_SUNLOCK(fdescp);
1884 error = EOPNOTSUPP;
1885 goto out;
1886 }
1887
1888 }
1889
1890 /*
1891 * Now replace the integer FDs with pointers to the
1892 * associated global file table entry..
1893 */
1894 newlen = oldfds * sizeof(struct file *);
1895 *controlp = sbcreatecontrol(NULL, newlen,
1896 SCM_RIGHTS, SOL_SOCKET);
1897 if (*controlp == NULL) {
1898 FILEDESC_SUNLOCK(fdescp);
1899 error = E2BIG;
1900 goto out;
1901 }
1902 fdp = data;
1903 rp = (struct file **)
1904 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1905 for (i = 0; i < oldfds; i++) {
1906 fp = fdescp->fd_ofiles[*fdp++];
1907 *rp++ = fp;
1908 unp_internalize_fp(fp);
1909 }
1910 FILEDESC_SUNLOCK(fdescp);
1911 break;
1912
1913 case SCM_TIMESTAMP:
1914 *controlp = sbcreatecontrol(NULL, sizeof(*tv),
1915 SCM_TIMESTAMP, SOL_SOCKET);
1916 if (*controlp == NULL) {
1917 error = ENOBUFS;
1918 goto out;
1919 }
1920 tv = (struct timeval *)
1921 CMSG_DATA(mtod(*controlp, struct cmsghdr *));
1922 microtime(tv);
1923 break;
1924
1925 default:
1926 error = EINVAL;
1927 goto out;
1928 }
1929
1930 controlp = &(*controlp)->m_next;
1931 if (CMSG_SPACE(datalen) < clen) {
1932 clen -= CMSG_SPACE(datalen);
1933 cm = (struct cmsghdr *)
1934 ((caddr_t)cm + CMSG_SPACE(datalen));
1935 } else {
1936 clen = 0;
1937 cm = NULL;
1938 }
1939 }
1940
1941out:
1942 m_freem(control);
1943 return (error);
1944}
1945
1946static struct mbuf *
1947unp_addsockcred(struct thread *td, struct mbuf *control)
1948{
1949 struct mbuf *m, *n, *n_prev;
1950 struct sockcred *sc;
1951 const struct cmsghdr *cm;
1952 int ngroups;
1953 int i;
1954
1955 ngroups = MIN(td->td_ucred->cr_ngroups, CMGROUP_MAX);
1956 m = sbcreatecontrol(NULL, SOCKCREDSIZE(ngroups), SCM_CREDS, SOL_SOCKET);
1957 if (m == NULL)
1958 return (control);
1959
1960 sc = (struct sockcred *) CMSG_DATA(mtod(m, struct cmsghdr *));
1961 sc->sc_uid = td->td_ucred->cr_ruid;
1962 sc->sc_euid = td->td_ucred->cr_uid;
1963 sc->sc_gid = td->td_ucred->cr_rgid;
1964 sc->sc_egid = td->td_ucred->cr_gid;
1965 sc->sc_ngroups = ngroups;
1966 for (i = 0; i < sc->sc_ngroups; i++)
1967 sc->sc_groups[i] = td->td_ucred->cr_groups[i];
1968
1969 /*
1970 * Unlink SCM_CREDS control messages (struct cmsgcred), since just
1971 * created SCM_CREDS control message (struct sockcred) has another
1972 * format.
1973 */
1974 if (control != NULL)
1975 for (n = control, n_prev = NULL; n != NULL;) {
1976 cm = mtod(n, struct cmsghdr *);
1977 if (cm->cmsg_level == SOL_SOCKET &&
1978 cm->cmsg_type == SCM_CREDS) {
1979 if (n_prev == NULL)
1980 control = n->m_next;
1981 else
1982 n_prev->m_next = n->m_next;
1983 n = m_free(n);
1984 } else {
1985 n_prev = n;
1986 n = n->m_next;
1987 }
1988 }
1989
1990 /* Prepend it to the head. */
1991 m->m_next = control;
1992 return (m);
1993}
1994
1995static struct unpcb *
1996fptounp(struct file *fp)
1997{
1998 struct socket *so;
1999
2000 if (fp->f_type != DTYPE_SOCKET)
2001 return (NULL);
2002 if ((so = fp->f_data) == NULL)
2003 return (NULL);
2004 if (so->so_proto->pr_domain != &localdomain)
2005 return (NULL);
2006 return sotounpcb(so);
2007}
2008
2009static void
2010unp_discard(struct file *fp)
2011{
2012 struct unp_defer *dr;
2013
2014 if (unp_externalize_fp(fp)) {
2015 dr = malloc(sizeof(*dr), M_TEMP, M_WAITOK);
2016 dr->ud_fp = fp;
2017 UNP_DEFERRED_LOCK();
2018 SLIST_INSERT_HEAD(&unp_defers, dr, ud_link);
2019 UNP_DEFERRED_UNLOCK();
2020 atomic_add_int(&unp_defers_count, 1);
2021 taskqueue_enqueue(taskqueue_thread, &unp_defer_task);
2022 } else
2023 (void) closef(fp, (struct thread *)NULL);
2024}
2025
2026static void
2027unp_process_defers(void *arg __unused, int pending)
2028{
2029 struct unp_defer *dr;
2030 SLIST_HEAD(, unp_defer) drl;
2031 int count;
2032
2033 SLIST_INIT(&drl);
2034 for (;;) {
2035 UNP_DEFERRED_LOCK();
2036 if (SLIST_FIRST(&unp_defers) == NULL) {
2037 UNP_DEFERRED_UNLOCK();
2038 break;
2039 }
2040 SLIST_SWAP(&unp_defers, &drl, unp_defer);
2041 UNP_DEFERRED_UNLOCK();
2042 count = 0;
2043 while ((dr = SLIST_FIRST(&drl)) != NULL) {
2044 SLIST_REMOVE_HEAD(&drl, ud_link);
2045 closef(dr->ud_fp, NULL);
2046 free(dr, M_TEMP);
2047 count++;
2048 }
2049 atomic_add_int(&unp_defers_count, -count);
2050 }
2051}
2052
2053static void
2054unp_internalize_fp(struct file *fp)
2055{
2056 struct unpcb *unp;
2057
2058 UNP_LINK_WLOCK();
2059 if ((unp = fptounp(fp)) != NULL) {
2060 unp->unp_file = fp;
2061 unp->unp_msgcount++;
2062 }
2063 fhold(fp);
2064 unp_rights++;
2065 UNP_LINK_WUNLOCK();
2066}
2067
2068static int
2069unp_externalize_fp(struct file *fp)
2070{
2071 struct unpcb *unp;
2072 int ret;
2073
2074 UNP_LINK_WLOCK();
2075 if ((unp = fptounp(fp)) != NULL) {
2076 unp->unp_msgcount--;
2077 ret = 1;
2078 } else
2079 ret = 0;
2080 unp_rights--;
2081 UNP_LINK_WUNLOCK();
2082 return (ret);
2083}
2084
2085/*
2086 * unp_defer indicates whether additional work has been defered for a future
2087 * pass through unp_gc(). It is thread local and does not require explicit
2088 * synchronization.
2089 */
2090static int unp_marked;
2091static int unp_unreachable;
2092
2093static void
2094unp_accessable(struct file *fp)
2095{
2096 struct unpcb *unp;
2097
2098 if ((unp = fptounp(fp)) == NULL)
2099 return;
2100 if (unp->unp_gcflag & UNPGC_REF)
2101 return;
2102 unp->unp_gcflag &= ~UNPGC_DEAD;
2103 unp->unp_gcflag |= UNPGC_REF;
2104 unp_marked++;
2105}
2106
2107static void
2108unp_gc_process(struct unpcb *unp)
2109{
2110 struct socket *soa;
2111 struct socket *so;
2112 struct file *fp;
2113
2114 /* Already processed. */
2115 if (unp->unp_gcflag & UNPGC_SCANNED)
2116 return;
2117 fp = unp->unp_file;
2118
2119 /*
2120 * Check for a socket potentially in a cycle. It must be in a
2121 * queue as indicated by msgcount, and this must equal the file
2122 * reference count. Note that when msgcount is 0 the file is NULL.
2123 */
2124 if ((unp->unp_gcflag & UNPGC_REF) == 0 && fp &&
2125 unp->unp_msgcount != 0 && fp->f_count == unp->unp_msgcount) {
2126 unp->unp_gcflag |= UNPGC_DEAD;
2127 unp_unreachable++;
2128 return;
2129 }
2130
2131 /*
2132 * Mark all sockets we reference with RIGHTS.
2133 */
2134 so = unp->unp_socket;
2135 SOCKBUF_LOCK(&so->so_rcv);
2136 unp_scan(so->so_rcv.sb_mb, unp_accessable);
2137 SOCKBUF_UNLOCK(&so->so_rcv);
2138
2139 /*
2140 * Mark all sockets in our accept queue.
2141 */
2142 ACCEPT_LOCK();
2143 TAILQ_FOREACH(soa, &so->so_comp, so_list) {
2144 SOCKBUF_LOCK(&soa->so_rcv);
2145 unp_scan(soa->so_rcv.sb_mb, unp_accessable);
2146 SOCKBUF_UNLOCK(&soa->so_rcv);
2147 }
2148 ACCEPT_UNLOCK();
2149 unp->unp_gcflag |= UNPGC_SCANNED;
2150}
2151
2152static int unp_recycled;
2153SYSCTL_INT(_net_local, OID_AUTO, recycled, CTLFLAG_RD, &unp_recycled, 0,
2154 "Number of unreachable sockets claimed by the garbage collector.");
2155
2156static int unp_taskcount;
2157SYSCTL_INT(_net_local, OID_AUTO, taskcount, CTLFLAG_RD, &unp_taskcount, 0,
2158 "Number of times the garbage collector has run.");
2159
2160static void
2161unp_gc(__unused void *arg, int pending)
2162{
2163 struct unp_head *heads[] = { &unp_dhead, &unp_shead, &unp_sphead,
2164 NULL };
2165 struct unp_head **head;
2166 struct file *f, **unref;
2167 struct unpcb *unp;
2168 int i, total;
2169
2170 unp_taskcount++;
2171 UNP_LIST_LOCK();
2172 /*
2173 * First clear all gc flags from previous runs.
2174 */
2175 for (head = heads; *head != NULL; head++)
2176 LIST_FOREACH(unp, *head, unp_link)
2177 unp->unp_gcflag = 0;
2178
2179 /*
2180 * Scan marking all reachable sockets with UNPGC_REF. Once a socket
2181 * is reachable all of the sockets it references are reachable.
2182 * Stop the scan once we do a complete loop without discovering
2183 * a new reachable socket.
2184 */
2185 do {
2186 unp_unreachable = 0;
2187 unp_marked = 0;
2188 for (head = heads; *head != NULL; head++)
2189 LIST_FOREACH(unp, *head, unp_link)
2190 unp_gc_process(unp);
2191 } while (unp_marked);
2192 UNP_LIST_UNLOCK();
2193 if (unp_unreachable == 0)
2194 return;
2195
2196 /*
2197 * Allocate space for a local list of dead unpcbs.
2198 */
2199 unref = malloc(unp_unreachable * sizeof(struct file *),
2200 M_TEMP, M_WAITOK);
2201
2202 /*
2203 * Iterate looking for sockets which have been specifically marked
2204 * as as unreachable and store them locally.
2205 */
2206 UNP_LINK_RLOCK();
2207 UNP_LIST_LOCK();
2208 for (total = 0, head = heads; *head != NULL; head++)
2209 LIST_FOREACH(unp, *head, unp_link)
2210 if ((unp->unp_gcflag & UNPGC_DEAD) != 0) {
2211 f = unp->unp_file;
2212 if (unp->unp_msgcount == 0 || f == NULL ||
2213 f->f_count != unp->unp_msgcount)
2214 continue;
2215 unref[total++] = f;
2216 fhold(f);
2217 KASSERT(total <= unp_unreachable,
2218 ("unp_gc: incorrect unreachable count."));
2219 }
2220 UNP_LIST_UNLOCK();
2221 UNP_LINK_RUNLOCK();
2222
2223 /*
2224 * Now flush all sockets, free'ing rights. This will free the
2225 * struct files associated with these sockets but leave each socket
2226 * with one remaining ref.
2227 */
2228 for (i = 0; i < total; i++) {
2229 struct socket *so;
2230
2231 so = unref[i]->f_data;
2232 CURVNET_SET(so->so_vnet);
2233 sorflush(so);
2234 CURVNET_RESTORE();
2235 }
2236
2237 /*
2238 * And finally release the sockets so they can be reclaimed.
2239 */
2240 for (i = 0; i < total; i++)
2241 fdrop(unref[i], NULL);
2242 unp_recycled += total;
2243 free(unref, M_TEMP);
2244}
2245
2246static void
2247unp_dispose(struct mbuf *m)
2248{
2249
2250 if (m)
2251 unp_scan(m, unp_discard);
2252}
2253
2254static void
2255unp_scan(struct mbuf *m0, void (*op)(struct file *))
2256{
2257 struct mbuf *m;
2258 struct file **rp;
2259 struct cmsghdr *cm;
2260 void *data;
2261 int i;
2262 socklen_t clen, datalen;
2263 int qfds;
2264
2265 while (m0 != NULL) {
2266 for (m = m0; m; m = m->m_next) {
2267 if (m->m_type != MT_CONTROL)
2268 continue;
2269
2270 cm = mtod(m, struct cmsghdr *);
2271 clen = m->m_len;
2272
2273 while (cm != NULL) {
2274 if (sizeof(*cm) > clen || cm->cmsg_len > clen)
2275 break;
2276
2277 data = CMSG_DATA(cm);
2278 datalen = (caddr_t)cm + cm->cmsg_len
2279 - (caddr_t)data;
2280
2281 if (cm->cmsg_level == SOL_SOCKET &&
2282 cm->cmsg_type == SCM_RIGHTS) {
2283 qfds = datalen / sizeof (struct file *);
2284 rp = data;
2285 for (i = 0; i < qfds; i++)
2286 (*op)(*rp++);
2287 }
2288
2289 if (CMSG_SPACE(datalen) < clen) {
2290 clen -= CMSG_SPACE(datalen);
2291 cm = (struct cmsghdr *)
2292 ((caddr_t)cm + CMSG_SPACE(datalen));
2293 } else {
2294 clen = 0;
2295 cm = NULL;
2296 }
2297 }
2298 }
2299 m0 = m0->m_act;
2300 }
2301}
2302
2303/*
2304 * A helper function called by VFS before socket-type vnode reclamation.
2305 * For an active vnode it clears unp_vnode pointer and decrements unp_vnode
2306 * use count.
2307 */
2308void
2309vfs_unp_reclaim(struct vnode *vp)
2310{
2311 struct socket *so;
2312 struct unpcb *unp;
2313 int active;
2314
2315 ASSERT_VOP_ELOCKED(vp, "vfs_unp_reclaim");
2316 KASSERT(vp->v_type == VSOCK,
2317 ("vfs_unp_reclaim: vp->v_type != VSOCK"));
2318
2319 active = 0;
2320 UNP_LINK_WLOCK();
|
2321 so = vp->v_socket;
| 2321 VOP_UNP_CONNECT(vp, &so);
|
2322 if (so == NULL)
2323 goto done;
2324 unp = sotounpcb(so);
2325 if (unp == NULL)
2326 goto done;
2327 UNP_PCB_LOCK(unp);
| 2322 if (so == NULL)
2323 goto done;
2324 unp = sotounpcb(so);
2325 if (unp == NULL)
2326 goto done;
2327 UNP_PCB_LOCK(unp);
|
2328 if (unp->unp_vnode != NULL) {
2329 KASSERT(unp->unp_vnode == vp,
2330 ("vfs_unp_reclaim: vp != unp->unp_vnode"));
2331 vp->v_socket = NULL;
| 2328 if (unp->unp_vnode == vp) {
2329 VOP_UNP_DETACH(vp);
|
2332 unp->unp_vnode = NULL;
2333 active = 1;
2334 }
2335 UNP_PCB_UNLOCK(unp);
2336done:
2337 UNP_LINK_WUNLOCK();
2338 if (active)
2339 vunref(vp);
2340}
2341
2342#ifdef DDB
2343static void
2344db_print_indent(int indent)
2345{
2346 int i;
2347
2348 for (i = 0; i < indent; i++)
2349 db_printf(" ");
2350}
2351
2352static void
2353db_print_unpflags(int unp_flags)
2354{
2355 int comma;
2356
2357 comma = 0;
2358 if (unp_flags & UNP_HAVEPC) {
2359 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2360 comma = 1;
2361 }
2362 if (unp_flags & UNP_HAVEPCCACHED) {
2363 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2364 comma = 1;
2365 }
2366 if (unp_flags & UNP_WANTCRED) {
2367 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2368 comma = 1;
2369 }
2370 if (unp_flags & UNP_CONNWAIT) {
2371 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2372 comma = 1;
2373 }
2374 if (unp_flags & UNP_CONNECTING) {
2375 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2376 comma = 1;
2377 }
2378 if (unp_flags & UNP_BINDING) {
2379 db_printf("%sUNP_BINDING", comma ? ", " : "");
2380 comma = 1;
2381 }
2382}
2383
2384static void
2385db_print_xucred(int indent, struct xucred *xu)
2386{
2387 int comma, i;
2388
2389 db_print_indent(indent);
2390 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2391 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2392 db_print_indent(indent);
2393 db_printf("cr_groups: ");
2394 comma = 0;
2395 for (i = 0; i < xu->cr_ngroups; i++) {
2396 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2397 comma = 1;
2398 }
2399 db_printf("\n");
2400}
2401
2402static void
2403db_print_unprefs(int indent, struct unp_head *uh)
2404{
2405 struct unpcb *unp;
2406 int counter;
2407
2408 counter = 0;
2409 LIST_FOREACH(unp, uh, unp_reflink) {
2410 if (counter % 4 == 0)
2411 db_print_indent(indent);
2412 db_printf("%p ", unp);
2413 if (counter % 4 == 3)
2414 db_printf("\n");
2415 counter++;
2416 }
2417 if (counter != 0 && counter % 4 != 0)
2418 db_printf("\n");
2419}
2420
2421DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2422{
2423 struct unpcb *unp;
2424
2425 if (!have_addr) {
2426 db_printf("usage: show unpcb <addr>\n");
2427 return;
2428 }
2429 unp = (struct unpcb *)addr;
2430
2431 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2432 unp->unp_vnode);
2433
2434 db_printf("unp_ino: %d unp_conn: %p\n", unp->unp_ino,
2435 unp->unp_conn);
2436
2437 db_printf("unp_refs:\n");
2438 db_print_unprefs(2, &unp->unp_refs);
2439
2440 /* XXXRW: Would be nice to print the full address, if any. */
2441 db_printf("unp_addr: %p\n", unp->unp_addr);
2442
2443 db_printf("unp_cc: %d unp_mbcnt: %d unp_gencnt: %llu\n",
2444 unp->unp_cc, unp->unp_mbcnt,
2445 (unsigned long long)unp->unp_gencnt);
2446
2447 db_printf("unp_flags: %x (", unp->unp_flags);
2448 db_print_unpflags(unp->unp_flags);
2449 db_printf(")\n");
2450
2451 db_printf("unp_peercred:\n");
2452 db_print_xucred(2, &unp->unp_peercred);
2453
2454 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2455}
2456#endif
| 2330 unp->unp_vnode = NULL;
2331 active = 1;
2332 }
2333 UNP_PCB_UNLOCK(unp);
2334done:
2335 UNP_LINK_WUNLOCK();
2336 if (active)
2337 vunref(vp);
2338}
2339
2340#ifdef DDB
2341static void
2342db_print_indent(int indent)
2343{
2344 int i;
2345
2346 for (i = 0; i < indent; i++)
2347 db_printf(" ");
2348}
2349
2350static void
2351db_print_unpflags(int unp_flags)
2352{
2353 int comma;
2354
2355 comma = 0;
2356 if (unp_flags & UNP_HAVEPC) {
2357 db_printf("%sUNP_HAVEPC", comma ? ", " : "");
2358 comma = 1;
2359 }
2360 if (unp_flags & UNP_HAVEPCCACHED) {
2361 db_printf("%sUNP_HAVEPCCACHED", comma ? ", " : "");
2362 comma = 1;
2363 }
2364 if (unp_flags & UNP_WANTCRED) {
2365 db_printf("%sUNP_WANTCRED", comma ? ", " : "");
2366 comma = 1;
2367 }
2368 if (unp_flags & UNP_CONNWAIT) {
2369 db_printf("%sUNP_CONNWAIT", comma ? ", " : "");
2370 comma = 1;
2371 }
2372 if (unp_flags & UNP_CONNECTING) {
2373 db_printf("%sUNP_CONNECTING", comma ? ", " : "");
2374 comma = 1;
2375 }
2376 if (unp_flags & UNP_BINDING) {
2377 db_printf("%sUNP_BINDING", comma ? ", " : "");
2378 comma = 1;
2379 }
2380}
2381
2382static void
2383db_print_xucred(int indent, struct xucred *xu)
2384{
2385 int comma, i;
2386
2387 db_print_indent(indent);
2388 db_printf("cr_version: %u cr_uid: %u cr_ngroups: %d\n",
2389 xu->cr_version, xu->cr_uid, xu->cr_ngroups);
2390 db_print_indent(indent);
2391 db_printf("cr_groups: ");
2392 comma = 0;
2393 for (i = 0; i < xu->cr_ngroups; i++) {
2394 db_printf("%s%u", comma ? ", " : "", xu->cr_groups[i]);
2395 comma = 1;
2396 }
2397 db_printf("\n");
2398}
2399
2400static void
2401db_print_unprefs(int indent, struct unp_head *uh)
2402{
2403 struct unpcb *unp;
2404 int counter;
2405
2406 counter = 0;
2407 LIST_FOREACH(unp, uh, unp_reflink) {
2408 if (counter % 4 == 0)
2409 db_print_indent(indent);
2410 db_printf("%p ", unp);
2411 if (counter % 4 == 3)
2412 db_printf("\n");
2413 counter++;
2414 }
2415 if (counter != 0 && counter % 4 != 0)
2416 db_printf("\n");
2417}
2418
2419DB_SHOW_COMMAND(unpcb, db_show_unpcb)
2420{
2421 struct unpcb *unp;
2422
2423 if (!have_addr) {
2424 db_printf("usage: show unpcb <addr>\n");
2425 return;
2426 }
2427 unp = (struct unpcb *)addr;
2428
2429 db_printf("unp_socket: %p unp_vnode: %p\n", unp->unp_socket,
2430 unp->unp_vnode);
2431
2432 db_printf("unp_ino: %d unp_conn: %p\n", unp->unp_ino,
2433 unp->unp_conn);
2434
2435 db_printf("unp_refs:\n");
2436 db_print_unprefs(2, &unp->unp_refs);
2437
2438 /* XXXRW: Would be nice to print the full address, if any. */
2439 db_printf("unp_addr: %p\n", unp->unp_addr);
2440
2441 db_printf("unp_cc: %d unp_mbcnt: %d unp_gencnt: %llu\n",
2442 unp->unp_cc, unp->unp_mbcnt,
2443 (unsigned long long)unp->unp_gencnt);
2444
2445 db_printf("unp_flags: %x (", unp->unp_flags);
2446 db_print_unpflags(unp->unp_flags);
2447 db_printf(")\n");
2448
2449 db_printf("unp_peercred:\n");
2450 db_print_xucred(2, &unp->unp_peercred);
2451
2452 db_printf("unp_refcount: %u\n", unp->unp_refcount);
2453}
2454#endif
|