projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'davem-next' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[deliverable/linux.git] / net / unix / af_unix.c
1 /*
2 * NET4: Implementation of BSD Unix domain sockets.
3 *
4 * Authors: Alan Cox, <alan.cox@linux.org>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Fixes:
12 * Linus Torvalds : Assorted bug cures.
13 * Niibe Yutaka : async I/O support.
14 * Carsten Paeth : PF_UNIX check, address fixes.
15 * Alan Cox : Limit size of allocated blocks.
16 * Alan Cox : Fixed the stupid socketpair bug.
17 * Alan Cox : BSD compatibility fine tuning.
18 * Alan Cox : Fixed a bug in connect when interrupted.
19 * Alan Cox : Sorted out a proper draft version of
20 * file descriptor passing hacked up from
21 * Mike Shaver's work.
22 * Marty Leisner : Fixes to fd passing
23 * Nick Nevin : recvmsg bugfix.
24 * Alan Cox : Started proper garbage collector
25 * Heiko EiBfeldt : Missing verify_area check
26 * Alan Cox : Started POSIXisms
27 * Andreas Schwab : Replace inode by dentry for proper
28 * reference counting
29 * Kirk Petersen : Made this a module
30 * Christoph Rohland : Elegant non-blocking accept/connect algorithm.
31 * Lots of bug fixes.
32 * Alexey Kuznetosv : Repaired (I hope) bugs introduces
33 * by above two patches.
34 * Andrea Arcangeli : If possible we block in connect(2)
35 * if the max backlog of the listen socket
36 * is been reached. This won't break
37 * old apps and it will avoid huge amount
38 * of socks hashed (this for unix_gc()
39 * performances reasons).
40 * Security fix that limits the max
41 * number of socks to 2*max_files and
42 * the number of skb queueable in the
43 * dgram receiver.
44 * Artur Skawina : Hash function optimizations
45 * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8)
46 * Malcolm Beattie : Set peercred for socketpair
47 * Michal Ostrowski : Module initialization cleanup.
48 * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT,
49 * the core infrastructure is doing that
50 * for all net proto families now (2.5.69+)
51 *
52 *
53 * Known differences from reference BSD that was tested:
54 *
55 * [TO FIX]
56 * ECONNREFUSED is not returned from one end of a connected() socket to the
57 * other the moment one end closes.
58 * fstat() doesn't return st_dev=0, and give the blksize as high water mark
59 * and a fake inode identifier (nor the BSD first socket fstat twice bug).
60 * [NOT TO FIX]
61 * accept() returns a path name even if the connecting socket has closed
62 * in the meantime (BSD loses the path and gives up).
63 * accept() returns 0 length path for an unbound connector. BSD returns 16
64 * and a null first byte in the path (but not for gethost/peername - BSD bug ??)
65 * socketpair(...SOCK_RAW..) doesn't panic the kernel.
66 * BSD af_unix apparently has connect forgetting to block properly.
67 * (need to check this with the POSIX spec in detail)
68 *
69 * Differences from 2.0.0-11-... (ANK)
70 * Bug fixes and improvements.
71 * - client shutdown killed server socket.
72 * - removed all useless cli/sti pairs.
73 *
74 * Semantic changes/extensions.
75 * - generic control message passing.
76 * - SCM_CREDENTIALS control message.
77 * - "Abstract" (not FS based) socket bindings.
78 * Abstract names are sequences of bytes (not zero terminated)
79 * started by 0, so that this name space does not intersect
80 * with BSD names.
81 */
82
83 #include <linux/module.h>
84 #include <linux/kernel.h>
85 #include <linux/signal.h>
86 #include <linux/sched.h>
87 #include <linux/errno.h>
88 #include <linux/string.h>
89 #include <linux/stat.h>
90 #include <linux/dcache.h>
91 #include <linux/namei.h>
92 #include <linux/socket.h>
93 #include <linux/un.h>
94 #include <linux/fcntl.h>
95 #include <linux/termios.h>
96 #include <linux/sockios.h>
97 #include <linux/net.h>
98 #include <linux/in.h>
99 #include <linux/fs.h>
100 #include <linux/slab.h>
101 #include <asm/uaccess.h>
102 #include <linux/skbuff.h>
103 #include <linux/netdevice.h>
104 #include <net/net_namespace.h>
105 #include <net/sock.h>
106 #include <net/tcp_states.h>
107 #include <net/af_unix.h>
108 #include <linux/proc_fs.h>
109 #include <linux/seq_file.h>
110 #include <net/scm.h>
111 #include <linux/init.h>
112 #include <linux/poll.h>
113 #include <linux/rtnetlink.h>
114 #include <linux/mount.h>
115 #include <net/checksum.h>
116 #include <linux/security.h>
117
118 static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
119 static DEFINE_SPINLOCK(unix_table_lock);
120 static atomic_t unix_nr_socks = ATOMIC_INIT(0);
121
122 #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
123
124 #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE)
125
126 #ifdef CONFIG_SECURITY_NETWORK
127 static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
128 {
129 memcpy(UNIXSID(skb), &scm->secid, sizeof(u32));
130 }
131
132 static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
133 {
134 scm->secid = *UNIXSID(skb);
135 }
136 #else
137 static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
138 { }
139
140 static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
141 { }
142 #endif /* CONFIG_SECURITY_NETWORK */
143
144 /*
145 * SMP locking strategy:
146 * hash table is protected with spinlock unix_table_lock
147 * each socket state is protected by separate rwlock.
148 */
149
150 static inline unsigned unix_hash_fold(__wsum n)
151 {
152 unsigned hash = (__force unsigned)n;
153 hash ^= hash>>16;
154 hash ^= hash>>8;
155 return hash&(UNIX_HASH_SIZE-1);
156 }
157
158 #define unix_peer(sk) (unix_sk(sk)->peer)
159
160 static inline int unix_our_peer(struct sock *sk, struct sock *osk)
161 {
162 return unix_peer(osk) == sk;
163 }
164
165 static inline int unix_may_send(struct sock *sk, struct sock *osk)
166 {
167 return (unix_peer(osk) == NULL || unix_our_peer(sk, osk));
168 }
169
170 static struct sock *unix_peer_get(struct sock *s)
171 {
172 struct sock *peer;
173
174 unix_state_lock(s);
175 peer = unix_peer(s);
176 if (peer)
177 sock_hold(peer);
178 unix_state_unlock(s);
179 return peer;
180 }
181
182 static inline void unix_release_addr(struct unix_address *addr)
183 {
184 if (atomic_dec_and_test(&addr->refcnt))
185 kfree(addr);
186 }
187
188 /*
189 * Check unix socket name:
190 * - should be not zero length.
191 * - if started by not zero, should be NULL terminated (FS object)
192 * - if started by zero, it is abstract name.
193 */
194
195 static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp)
196 {
197 if (len <= sizeof(short) || len > sizeof(*sunaddr))
198 return -EINVAL;
199 if (!sunaddr || sunaddr->sun_family != AF_UNIX)
200 return -EINVAL;
201 if (sunaddr->sun_path[0]) {
202 /*
203 * This may look like an off by one error but it is a bit more
204 * subtle. 108 is the longest valid AF_UNIX path for a binding.
205 * sun_path[108] doesnt as such exist. However in kernel space
206 * we are guaranteed that it is a valid memory location in our
207 * kernel address buffer.
208 */
209 ((char *)sunaddr)[len]=0;
210 len = strlen(sunaddr->sun_path)+1+sizeof(short);
211 return len;
212 }
213
214 *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0));
215 return len;
216 }
217
218 static void __unix_remove_socket(struct sock *sk)
219 {
220 sk_del_node_init(sk);
221 }
222
223 static void __unix_insert_socket(struct hlist_head *list, struct sock *sk)
224 {
225 BUG_TRAP(sk_unhashed(sk));
226 sk_add_node(sk, list);
227 }
228
229 static inline void unix_remove_socket(struct sock *sk)
230 {
231 spin_lock(&unix_table_lock);
232 __unix_remove_socket(sk);
233 spin_unlock(&unix_table_lock);
234 }
235
236 static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk)
237 {
238 spin_lock(&unix_table_lock);
239 __unix_insert_socket(list, sk);
240 spin_unlock(&unix_table_lock);
241 }
242
243 static struct sock *__unix_find_socket_byname(struct net *net,
244 struct sockaddr_un *sunname,
245 int len, int type, unsigned hash)
246 {
247 struct sock *s;
248 struct hlist_node *node;
249
250 sk_for_each(s, node, &unix_socket_table[hash ^ type]) {
251 struct unix_sock *u = unix_sk(s);
252
253 if (!net_eq(sock_net(s), net))
254 continue;
255
256 if (u->addr->len == len &&
257 !memcmp(u->addr->name, sunname, len))
258 goto found;
259 }
260 s = NULL;
261 found:
262 return s;
263 }
264
265 static inline struct sock *unix_find_socket_byname(struct net *net,
266 struct sockaddr_un *sunname,
267 int len, int type,
268 unsigned hash)
269 {
270 struct sock *s;
271
272 spin_lock(&unix_table_lock);
273 s = __unix_find_socket_byname(net, sunname, len, type, hash);
274 if (s)
275 sock_hold(s);
276 spin_unlock(&unix_table_lock);
277 return s;
278 }
279
280 static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i)
281 {
282 struct sock *s;
283 struct hlist_node *node;
284
285 spin_lock(&unix_table_lock);
286 sk_for_each(s, node,
287 &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
288 struct dentry *dentry = unix_sk(s)->dentry;
289
290 if (!net_eq(sock_net(s), net))
291 continue;
292
293 if(dentry && dentry->d_inode == i)
294 {
295 sock_hold(s);
296 goto found;
297 }
298 }
299 s = NULL;
300 found:
301 spin_unlock(&unix_table_lock);
302 return s;
303 }
304
305 static inline int unix_writable(struct sock *sk)
306 {
307 return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf;
308 }
309
310 static void unix_write_space(struct sock *sk)
311 {
312 read_lock(&sk->sk_callback_lock);
313 if (unix_writable(sk)) {
314 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
315 wake_up_interruptible_sync(sk->sk_sleep);
316 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
317 }
318 read_unlock(&sk->sk_callback_lock);
319 }
320
321 /* When dgram socket disconnects (or changes its peer), we clear its receive
322 * queue of packets arrived from previous peer. First, it allows to do
323 * flow control based only on wmem_alloc; second, sk connected to peer
324 * may receive messages only from that peer. */
325 static void unix_dgram_disconnected(struct sock *sk, struct sock *other)
326 {
327 if (!skb_queue_empty(&sk->sk_receive_queue)) {
328 skb_queue_purge(&sk->sk_receive_queue);
329 wake_up_interruptible_all(&unix_sk(sk)->peer_wait);
330
331 /* If one link of bidirectional dgram pipe is disconnected,
332 * we signal error. Messages are lost. Do not make this,
333 * when peer was not connected to us.
334 */
335 if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) {
336 other->sk_err = ECONNRESET;
337 other->sk_error_report(other);
338 }
339 }
340 }
341
342 static void unix_sock_destructor(struct sock *sk)
343 {
344 struct unix_sock *u = unix_sk(sk);
345
346 skb_queue_purge(&sk->sk_receive_queue);
347
348 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
349 BUG_TRAP(sk_unhashed(sk));
350 BUG_TRAP(!sk->sk_socket);
351 if (!sock_flag(sk, SOCK_DEAD)) {
352 printk("Attempt to release alive unix socket: %p\n", sk);
353 return;
354 }
355
356 if (u->addr)
357 unix_release_addr(u->addr);
358
359 atomic_dec(&unix_nr_socks);
360 #ifdef UNIX_REFCNT_DEBUG
361 printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks));
362 #endif
363 }
364
365 static int unix_release_sock (struct sock *sk, int embrion)
366 {
367 struct unix_sock *u = unix_sk(sk);
368 struct dentry *dentry;
369 struct vfsmount *mnt;
370 struct sock *skpair;
371 struct sk_buff *skb;
372 int state;
373
374 unix_remove_socket(sk);
375
376 /* Clear state */
377 unix_state_lock(sk);
378 sock_orphan(sk);
379 sk->sk_shutdown = SHUTDOWN_MASK;
380 dentry = u->dentry;
381 u->dentry = NULL;
382 mnt = u->mnt;
383 u->mnt = NULL;
384 state = sk->sk_state;
385 sk->sk_state = TCP_CLOSE;
386 unix_state_unlock(sk);
387
388 wake_up_interruptible_all(&u->peer_wait);
389
390 skpair=unix_peer(sk);
391
392 if (skpair!=NULL) {
393 if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) {
394 unix_state_lock(skpair);
395 /* No more writes */
396 skpair->sk_shutdown = SHUTDOWN_MASK;
397 if (!skb_queue_empty(&sk->sk_receive_queue) || embrion)
398 skpair->sk_err = ECONNRESET;
399 unix_state_unlock(skpair);
400 skpair->sk_state_change(skpair);
401 read_lock(&skpair->sk_callback_lock);
402 sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP);
403 read_unlock(&skpair->sk_callback_lock);
404 }
405 sock_put(skpair); /* It may now die */
406 unix_peer(sk) = NULL;
407 }
408
409 /* Try to flush out this socket. Throw out buffers at least */
410
411 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
412 if (state==TCP_LISTEN)
413 unix_release_sock(skb->sk, 1);
414 /* passed fds are erased in the kfree_skb hook */
415 kfree_skb(skb);
416 }
417
418 if (dentry) {
419 dput(dentry);
420 mntput(mnt);
421 }
422
423 sock_put(sk);
424
425 /* ---- Socket is dead now and most probably destroyed ---- */
426
427 /*
428 * Fixme: BSD difference: In BSD all sockets connected to use get
429 * ECONNRESET and we die on the spot. In Linux we behave
430 * like files and pipes do and wait for the last
431 * dereference.
432 *
433 * Can't we simply set sock->err?
434 *
435 * What the above comment does talk about? --ANK(980817)
436 */
437
438 if (unix_tot_inflight)
439 unix_gc(); /* Garbage collect fds */
440
441 return 0;
442 }
443
444 static int unix_listen(struct socket *sock, int backlog)
445 {
446 int err;
447 struct sock *sk = sock->sk;
448 struct unix_sock *u = unix_sk(sk);
449
450 err = -EOPNOTSUPP;
451 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
452 goto out; /* Only stream/seqpacket sockets accept */
453 err = -EINVAL;
454 if (!u->addr)
455 goto out; /* No listens on an unbound socket */
456 unix_state_lock(sk);
457 if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN)
458 goto out_unlock;
459 if (backlog > sk->sk_max_ack_backlog)
460 wake_up_interruptible_all(&u->peer_wait);
461 sk->sk_max_ack_backlog = backlog;
462 sk->sk_state = TCP_LISTEN;
463 /* set credentials so connect can copy them */
464 sk->sk_peercred.pid = task_tgid_vnr(current);
465 sk->sk_peercred.uid = current->euid;
466 sk->sk_peercred.gid = current->egid;
467 err = 0;
468
469 out_unlock:
470 unix_state_unlock(sk);
471 out:
472 return err;
473 }
474
475 static int unix_release(struct socket *);
476 static int unix_bind(struct socket *, struct sockaddr *, int);
477 static int unix_stream_connect(struct socket *, struct sockaddr *,
478 int addr_len, int flags);
479 static int unix_socketpair(struct socket *, struct socket *);
480 static int unix_accept(struct socket *, struct socket *, int);
481 static int unix_getname(struct socket *, struct sockaddr *, int *, int);
482 static unsigned int unix_poll(struct file *, struct socket *, poll_table *);
483 static int unix_ioctl(struct socket *, unsigned int, unsigned long);
484 static int unix_shutdown(struct socket *, int);
485 static int unix_stream_sendmsg(struct kiocb *, struct socket *,
486 struct msghdr *, size_t);
487 static int unix_stream_recvmsg(struct kiocb *, struct socket *,
488 struct msghdr *, size_t, int);
489 static int unix_dgram_sendmsg(struct kiocb *, struct socket *,
490 struct msghdr *, size_t);
491 static int unix_dgram_recvmsg(struct kiocb *, struct socket *,
492 struct msghdr *, size_t, int);
493 static int unix_dgram_connect(struct socket *, struct sockaddr *,
494 int, int);
495 static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *,
496 struct msghdr *, size_t);
497
498 static const struct proto_ops unix_stream_ops = {
499 .family = PF_UNIX,
500 .owner = THIS_MODULE,
501 .release = unix_release,
502 .bind = unix_bind,
503 .connect = unix_stream_connect,
504 .socketpair = unix_socketpair,
505 .accept = unix_accept,
506 .getname = unix_getname,
507 .poll = unix_poll,
508 .ioctl = unix_ioctl,
509 .listen = unix_listen,
510 .shutdown = unix_shutdown,
511 .setsockopt = sock_no_setsockopt,
512 .getsockopt = sock_no_getsockopt,
513 .sendmsg = unix_stream_sendmsg,
514 .recvmsg = unix_stream_recvmsg,
515 .mmap = sock_no_mmap,
516 .sendpage = sock_no_sendpage,
517 };
518
519 static const struct proto_ops unix_dgram_ops = {
520 .family = PF_UNIX,
521 .owner = THIS_MODULE,
522 .release = unix_release,
523 .bind = unix_bind,
524 .connect = unix_dgram_connect,
525 .socketpair = unix_socketpair,
526 .accept = sock_no_accept,
527 .getname = unix_getname,
528 .poll = datagram_poll,
529 .ioctl = unix_ioctl,
530 .listen = sock_no_listen,
531 .shutdown = unix_shutdown,
532 .setsockopt = sock_no_setsockopt,
533 .getsockopt = sock_no_getsockopt,
534 .sendmsg = unix_dgram_sendmsg,
535 .recvmsg = unix_dgram_recvmsg,
536 .mmap = sock_no_mmap,
537 .sendpage = sock_no_sendpage,
538 };
539
540 static const struct proto_ops unix_seqpacket_ops = {
541 .family = PF_UNIX,
542 .owner = THIS_MODULE,
543 .release = unix_release,
544 .bind = unix_bind,
545 .connect = unix_stream_connect,
546 .socketpair = unix_socketpair,
547 .accept = unix_accept,
548 .getname = unix_getname,
549 .poll = datagram_poll,
550 .ioctl = unix_ioctl,
551 .listen = unix_listen,
552 .shutdown = unix_shutdown,
553 .setsockopt = sock_no_setsockopt,
554 .getsockopt = sock_no_getsockopt,
555 .sendmsg = unix_seqpacket_sendmsg,
556 .recvmsg = unix_dgram_recvmsg,
557 .mmap = sock_no_mmap,
558 .sendpage = sock_no_sendpage,
559 };
560
561 static struct proto unix_proto = {
562 .name = "UNIX",
563 .owner = THIS_MODULE,
564 .obj_size = sizeof(struct unix_sock),
565 };
566
567 /*
568 * AF_UNIX sockets do not interact with hardware, hence they
569 * dont trigger interrupts - so it's safe for them to have
570 * bh-unsafe locking for their sk_receive_queue.lock. Split off
571 * this special lock-class by reinitializing the spinlock key:
572 */
573 static struct lock_class_key af_unix_sk_receive_queue_lock_key;
574
575 static struct sock * unix_create1(struct net *net, struct socket *sock)
576 {
577 struct sock *sk = NULL;
578 struct unix_sock *u;
579
580 atomic_inc(&unix_nr_socks);
581 if (atomic_read(&unix_nr_socks) > 2 * get_max_files())
582 goto out;
583
584 sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto);
585 if (!sk)
586 goto out;
587
588 sock_init_data(sock,sk);
589 lockdep_set_class(&sk->sk_receive_queue.lock,
590 &af_unix_sk_receive_queue_lock_key);
591
592 sk->sk_write_space = unix_write_space;
593 sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen;
594 sk->sk_destruct = unix_sock_destructor;
595 u = unix_sk(sk);
596 u->dentry = NULL;
597 u->mnt = NULL;
598 spin_lock_init(&u->lock);
599 atomic_set(&u->inflight, 0);
600 INIT_LIST_HEAD(&u->link);
601 mutex_init(&u->readlock); /* single task reading lock */
602 init_waitqueue_head(&u->peer_wait);
603 unix_insert_socket(unix_sockets_unbound, sk);
604 out:
605 if (sk == NULL)
606 atomic_dec(&unix_nr_socks);
607 return sk;
608 }
609
610 static int unix_create(struct net *net, struct socket *sock, int protocol)
611 {
612 if (protocol && protocol != PF_UNIX)
613 return -EPROTONOSUPPORT;
614
615 sock->state = SS_UNCONNECTED;
616
617 switch (sock->type) {
618 case SOCK_STREAM:
619 sock->ops = &unix_stream_ops;
620 break;
621 /*
622 * Believe it or not BSD has AF_UNIX, SOCK_RAW though
623 * nothing uses it.
624 */
625 case SOCK_RAW:
626 sock->type=SOCK_DGRAM;
627 case SOCK_DGRAM:
628 sock->ops = &unix_dgram_ops;
629 break;
630 case SOCK_SEQPACKET:
631 sock->ops = &unix_seqpacket_ops;
632 break;
633 default:
634 return -ESOCKTNOSUPPORT;
635 }
636
637 return unix_create1(net, sock) ? 0 : -ENOMEM;
638 }
639
640 static int unix_release(struct socket *sock)
641 {
642 struct sock *sk = sock->sk;
643
644 if (!sk)
645 return 0;
646
647 sock->sk = NULL;
648
649 return unix_release_sock (sk, 0);
650 }
651
652 static int unix_autobind(struct socket *sock)
653 {
654 struct sock *sk = sock->sk;
655 struct net *net = sock_net(sk);
656 struct unix_sock *u = unix_sk(sk);
657 static u32 ordernum = 1;
658 struct unix_address * addr;
659 int err;
660
661 mutex_lock(&u->readlock);
662
663 err = 0;
664 if (u->addr)
665 goto out;
666
667 err = -ENOMEM;
668 addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL);
669 if (!addr)
670 goto out;
671
672 addr->name->sun_family = AF_UNIX;
673 atomic_set(&addr->refcnt, 1);
674
675 retry:
676 addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short);
677 addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0));
678
679 spin_lock(&unix_table_lock);
680 ordernum = (ordernum+1)&0xFFFFF;
681
682 if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type,
683 addr->hash)) {
684 spin_unlock(&unix_table_lock);
685 /* Sanity yield. It is unusual case, but yet... */
686 if (!(ordernum&0xFF))
687 yield();
688 goto retry;
689 }
690 addr->hash ^= sk->sk_type;
691
692 __unix_remove_socket(sk);
693 u->addr = addr;
694 __unix_insert_socket(&unix_socket_table[addr->hash], sk);
695 spin_unlock(&unix_table_lock);
696 err = 0;
697
698 out: mutex_unlock(&u->readlock);
699 return err;
700 }
701
702 static struct sock *unix_find_other(struct net *net,
703 struct sockaddr_un *sunname, int len,
704 int type, unsigned hash, int *error)
705 {
706 struct sock *u;
707 struct nameidata nd;
708 int err = 0;
709
710 if (sunname->sun_path[0]) {
711 err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd);
712 if (err)
713 goto fail;
714 err = vfs_permission(&nd, MAY_WRITE);
715 if (err)
716 goto put_fail;
717
718 err = -ECONNREFUSED;
719 if (!S_ISSOCK(nd.path.dentry->d_inode->i_mode))
720 goto put_fail;
721 u = unix_find_socket_byinode(net, nd.path.dentry->d_inode);
722 if (!u)
723 goto put_fail;
724
725 if (u->sk_type == type)
726 touch_atime(nd.path.mnt, nd.path.dentry);
727
728 path_put(&nd.path);
729
730 err=-EPROTOTYPE;
731 if (u->sk_type != type) {
732 sock_put(u);
733 goto fail;
734 }
735 } else {
736 err = -ECONNREFUSED;
737 u=unix_find_socket_byname(net, sunname, len, type, hash);
738 if (u) {
739 struct dentry *dentry;
740 dentry = unix_sk(u)->dentry;
741 if (dentry)
742 touch_atime(unix_sk(u)->mnt, dentry);
743 } else
744 goto fail;
745 }
746 return u;
747
748 put_fail:
749 path_put(&nd.path);
750 fail:
751 *error=err;
752 return NULL;
753 }
754
755
756 static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
757 {
758 struct sock *sk = sock->sk;
759 struct net *net = sock_net(sk);
760 struct unix_sock *u = unix_sk(sk);
761 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
762 struct dentry * dentry = NULL;
763 struct nameidata nd;
764 int err;
765 unsigned hash;
766 struct unix_address *addr;
767 struct hlist_head *list;
768
769 err = -EINVAL;
770 if (sunaddr->sun_family != AF_UNIX)
771 goto out;
772
773 if (addr_len==sizeof(short)) {
774 err = unix_autobind(sock);
775 goto out;
776 }
777
778 err = unix_mkname(sunaddr, addr_len, &hash);
779 if (err < 0)
780 goto out;
781 addr_len = err;
782
783 mutex_lock(&u->readlock);
784
785 err = -EINVAL;
786 if (u->addr)
787 goto out_up;
788
789 err = -ENOMEM;
790 addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL);
791 if (!addr)
792 goto out_up;
793
794 memcpy(addr->name, sunaddr, addr_len);
795 addr->len = addr_len;
796 addr->hash = hash ^ sk->sk_type;
797 atomic_set(&addr->refcnt, 1);
798
799 if (sunaddr->sun_path[0]) {
800 unsigned int mode;
801 err = 0;
802 /*
803 * Get the parent directory, calculate the hash for last
804 * component.
805 */
806 err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd);
807 if (err)
808 goto out_mknod_parent;
809
810 dentry = lookup_create(&nd, 0);
811 err = PTR_ERR(dentry);
812 if (IS_ERR(dentry))
813 goto out_mknod_unlock;
814
815 /*
816 * All right, let's create it.
817 */
818 mode = S_IFSOCK |
819 (SOCK_INODE(sock)->i_mode & ~current->fs->umask);
820 err = mnt_want_write(nd.path.mnt);
821 if (err)
822 goto out_mknod_dput;
823 err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0);
824 mnt_drop_write(nd.path.mnt);
825 if (err)
826 goto out_mknod_dput;
827 mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
828 dput(nd.path.dentry);
829 nd.path.dentry = dentry;
830
831 addr->hash = UNIX_HASH_SIZE;
832 }
833
834 spin_lock(&unix_table_lock);
835
836 if (!sunaddr->sun_path[0]) {
837 err = -EADDRINUSE;
838 if (__unix_find_socket_byname(net, sunaddr, addr_len,
839 sk->sk_type, hash)) {
840 unix_release_addr(addr);
841 goto out_unlock;
842 }
843
844 list = &unix_socket_table[addr->hash];
845 } else {
846 list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)];
847 u->dentry = nd.path.dentry;
848 u->mnt = nd.path.mnt;
849 }
850
851 err = 0;
852 __unix_remove_socket(sk);
853 u->addr = addr;
854 __unix_insert_socket(list, sk);
855
856 out_unlock:
857 spin_unlock(&unix_table_lock);
858 out_up:
859 mutex_unlock(&u->readlock);
860 out:
861 return err;
862
863 out_mknod_dput:
864 dput(dentry);
865 out_mknod_unlock:
866 mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
867 path_put(&nd.path);
868 out_mknod_parent:
869 if (err==-EEXIST)
870 err=-EADDRINUSE;
871 unix_release_addr(addr);
872 goto out_up;
873 }
874
875 static void unix_state_double_lock(struct sock *sk1, struct sock *sk2)
876 {
877 if (unlikely(sk1 == sk2) || !sk2) {
878 unix_state_lock(sk1);
879 return;
880 }
881 if (sk1 < sk2) {
882 unix_state_lock(sk1);
883 unix_state_lock_nested(sk2);
884 } else {
885 unix_state_lock(sk2);
886 unix_state_lock_nested(sk1);
887 }
888 }
889
890 static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2)
891 {
892 if (unlikely(sk1 == sk2) || !sk2) {
893 unix_state_unlock(sk1);
894 return;
895 }
896 unix_state_unlock(sk1);
897 unix_state_unlock(sk2);
898 }
899
900 static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
901 int alen, int flags)
902 {
903 struct sock *sk = sock->sk;
904 struct net *net = sock_net(sk);
905 struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr;
906 struct sock *other;
907 unsigned hash;
908 int err;
909
910 if (addr->sa_family != AF_UNSPEC) {
911 err = unix_mkname(sunaddr, alen, &hash);
912 if (err < 0)
913 goto out;
914 alen = err;
915
916 if (test_bit(SOCK_PASSCRED, &sock->flags) &&
917 !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0)
918 goto out;
919
920 restart:
921 other=unix_find_other(net, sunaddr, alen, sock->type, hash, &err);
922 if (!other)
923 goto out;
924
925 unix_state_double_lock(sk, other);
926
927 /* Apparently VFS overslept socket death. Retry. */
928 if (sock_flag(other, SOCK_DEAD)) {
929 unix_state_double_unlock(sk, other);
930 sock_put(other);
931 goto restart;
932 }
933
934 err = -EPERM;
935 if (!unix_may_send(sk, other))
936 goto out_unlock;
937
938 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
939 if (err)
940 goto out_unlock;
941
942 } else {
943 /*
944 * 1003.1g breaking connected state with AF_UNSPEC
945 */
946 other = NULL;
947 unix_state_double_lock(sk, other);
948 }
949
950 /*
951 * If it was connected, reconnect.
952 */
953 if (unix_peer(sk)) {
954 struct sock *old_peer = unix_peer(sk);
955 unix_peer(sk)=other;
956 unix_state_double_unlock(sk, other);
957
958 if (other != old_peer)
959 unix_dgram_disconnected(sk, old_peer);
960 sock_put(old_peer);
961 } else {
962 unix_peer(sk)=other;
963 unix_state_double_unlock(sk, other);
964 }
965 return 0;
966
967 out_unlock:
968 unix_state_double_unlock(sk, other);
969 sock_put(other);
970 out:
971 return err;
972 }
973
974 static long unix_wait_for_peer(struct sock *other, long timeo)
975 {
976 struct unix_sock *u = unix_sk(other);
977 int sched;
978 DEFINE_WAIT(wait);
979
980 prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE);
981
982 sched = !sock_flag(other, SOCK_DEAD) &&
983 !(other->sk_shutdown & RCV_SHUTDOWN) &&
984 (skb_queue_len(&other->sk_receive_queue) >
985 other->sk_max_ack_backlog);
986
987 unix_state_unlock(other);
988
989 if (sched)
990 timeo = schedule_timeout(timeo);
991
992 finish_wait(&u->peer_wait, &wait);
993 return timeo;
994 }
995
996 static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
997 int addr_len, int flags)
998 {
999 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
1000 struct sock *sk = sock->sk;
1001 struct net *net = sock_net(sk);
1002 struct unix_sock *u = unix_sk(sk), *newu, *otheru;
1003 struct sock *newsk = NULL;
1004 struct sock *other = NULL;
1005 struct sk_buff *skb = NULL;
1006 unsigned hash;
1007 int st;
1008 int err;
1009 long timeo;
1010
1011 err = unix_mkname(sunaddr, addr_len, &hash);
1012 if (err < 0)
1013 goto out;
1014 addr_len = err;
1015
1016 if (test_bit(SOCK_PASSCRED, &sock->flags)
1017 && !u->addr && (err = unix_autobind(sock)) != 0)
1018 goto out;
1019
1020 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1021
1022 /* First of all allocate resources.
1023 If we will make it after state is locked,
1024 we will have to recheck all again in any case.
1025 */
1026
1027 err = -ENOMEM;
1028
1029 /* create new sock for complete connection */
1030 newsk = unix_create1(sock_net(sk), NULL);
1031 if (newsk == NULL)
1032 goto out;
1033
1034 /* Allocate skb for sending to listening sock */
1035 skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL);
1036 if (skb == NULL)
1037 goto out;
1038
1039 restart:
1040 /* Find listening sock. */
1041 other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err);
1042 if (!other)
1043 goto out;
1044
1045 /* Latch state of peer */
1046 unix_state_lock(other);
1047
1048 /* Apparently VFS overslept socket death. Retry. */
1049 if (sock_flag(other, SOCK_DEAD)) {
1050 unix_state_unlock(other);
1051 sock_put(other);
1052 goto restart;
1053 }
1054
1055 err = -ECONNREFUSED;
1056 if (other->sk_state != TCP_LISTEN)
1057 goto out_unlock;
1058
1059 if (skb_queue_len(&other->sk_receive_queue) >
1060 other->sk_max_ack_backlog) {
1061 err = -EAGAIN;
1062 if (!timeo)
1063 goto out_unlock;
1064
1065 timeo = unix_wait_for_peer(other, timeo);
1066
1067 err = sock_intr_errno(timeo);
1068 if (signal_pending(current))
1069 goto out;
1070 sock_put(other);
1071 goto restart;
1072 }
1073
1074 /* Latch our state.
1075
1076 It is tricky place. We need to grab write lock and cannot
1077 drop lock on peer. It is dangerous because deadlock is
1078 possible. Connect to self case and simultaneous
1079 attempt to connect are eliminated by checking socket
1080 state. other is TCP_LISTEN, if sk is TCP_LISTEN we
1081 check this before attempt to grab lock.
1082
1083 Well, and we have to recheck the state after socket locked.
1084 */
1085 st = sk->sk_state;
1086
1087 switch (st) {
1088 case TCP_CLOSE:
1089 /* This is ok... continue with connect */
1090 break;
1091 case TCP_ESTABLISHED:
1092 /* Socket is already connected */
1093 err = -EISCONN;
1094 goto out_unlock;
1095 default:
1096 err = -EINVAL;
1097 goto out_unlock;
1098 }
1099
1100 unix_state_lock_nested(sk);
1101
1102 if (sk->sk_state != st) {
1103 unix_state_unlock(sk);
1104 unix_state_unlock(other);
1105 sock_put(other);
1106 goto restart;
1107 }
1108
1109 err = security_unix_stream_connect(sock, other->sk_socket, newsk);
1110 if (err) {
1111 unix_state_unlock(sk);
1112 goto out_unlock;
1113 }
1114
1115 /* The way is open! Fastly set all the necessary fields... */
1116
1117 sock_hold(sk);
1118 unix_peer(newsk) = sk;
1119 newsk->sk_state = TCP_ESTABLISHED;
1120 newsk->sk_type = sk->sk_type;
1121 newsk->sk_peercred.pid = task_tgid_vnr(current);
1122 newsk->sk_peercred.uid = current->euid;
1123 newsk->sk_peercred.gid = current->egid;
1124 newu = unix_sk(newsk);
1125 newsk->sk_sleep = &newu->peer_wait;
1126 otheru = unix_sk(other);
1127
1128 /* copy address information from listening to new sock*/
1129 if (otheru->addr) {
1130 atomic_inc(&otheru->addr->refcnt);
1131 newu->addr = otheru->addr;
1132 }
1133 if (otheru->dentry) {
1134 newu->dentry = dget(otheru->dentry);
1135 newu->mnt = mntget(otheru->mnt);
1136 }
1137
1138 /* Set credentials */
1139 sk->sk_peercred = other->sk_peercred;
1140
1141 sock->state = SS_CONNECTED;
1142 sk->sk_state = TCP_ESTABLISHED;
1143 sock_hold(newsk);
1144
1145 smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */
1146 unix_peer(sk) = newsk;
1147
1148 unix_state_unlock(sk);
1149
1150 /* take ten and and send info to listening sock */
1151 spin_lock(&other->sk_receive_queue.lock);
1152 __skb_queue_tail(&other->sk_receive_queue, skb);
1153 spin_unlock(&other->sk_receive_queue.lock);
1154 unix_state_unlock(other);
1155 other->sk_data_ready(other, 0);
1156 sock_put(other);
1157 return 0;
1158
1159 out_unlock:
1160 if (other)
1161 unix_state_unlock(other);
1162
1163 out:
1164 if (skb)
1165 kfree_skb(skb);
1166 if (newsk)
1167 unix_release_sock(newsk, 0);
1168 if (other)
1169 sock_put(other);
1170 return err;
1171 }
1172
1173 static int unix_socketpair(struct socket *socka, struct socket *sockb)
1174 {
1175 struct sock *ska=socka->sk, *skb = sockb->sk;
1176
1177 /* Join our sockets back to back */
1178 sock_hold(ska);
1179 sock_hold(skb);
1180 unix_peer(ska)=skb;
1181 unix_peer(skb)=ska;
1182 ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current);
1183 ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid;
1184 ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid;
1185
1186 if (ska->sk_type != SOCK_DGRAM) {
1187 ska->sk_state = TCP_ESTABLISHED;
1188 skb->sk_state = TCP_ESTABLISHED;
1189 socka->state = SS_CONNECTED;
1190 sockb->state = SS_CONNECTED;
1191 }
1192 return 0;
1193 }
1194
1195 static int unix_accept(struct socket *sock, struct socket *newsock, int flags)
1196 {
1197 struct sock *sk = sock->sk;
1198 struct sock *tsk;
1199 struct sk_buff *skb;
1200 int err;
1201
1202 err = -EOPNOTSUPP;
1203 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
1204 goto out;
1205
1206 err = -EINVAL;
1207 if (sk->sk_state != TCP_LISTEN)
1208 goto out;
1209
1210 /* If socket state is TCP_LISTEN it cannot change (for now...),
1211 * so that no locks are necessary.
1212 */
1213
1214 skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err);
1215 if (!skb) {
1216 /* This means receive shutdown. */
1217 if (err == 0)
1218 err = -EINVAL;
1219 goto out;
1220 }
1221
1222 tsk = skb->sk;
1223 skb_free_datagram(sk, skb);
1224 wake_up_interruptible(&unix_sk(sk)->peer_wait);
1225
1226 /* attach accepted sock to socket */
1227 unix_state_lock(tsk);
1228 newsock->state = SS_CONNECTED;
1229 sock_graft(tsk, newsock);
1230 unix_state_unlock(tsk);
1231 return 0;
1232
1233 out:
1234 return err;
1235 }
1236
1237
1238 static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
1239 {
1240 struct sock *sk = sock->sk;
1241 struct unix_sock *u;
1242 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
1243 int err = 0;
1244
1245 if (peer) {
1246 sk = unix_peer_get(sk);
1247
1248 err = -ENOTCONN;
1249 if (!sk)
1250 goto out;
1251 err = 0;
1252 } else {
1253 sock_hold(sk);
1254 }
1255
1256 u = unix_sk(sk);
1257 unix_state_lock(sk);
1258 if (!u->addr) {
1259 sunaddr->sun_family = AF_UNIX;
1260 sunaddr->sun_path[0] = 0;
1261 *uaddr_len = sizeof(short);
1262 } else {
1263 struct unix_address *addr = u->addr;
1264
1265 *uaddr_len = addr->len;
1266 memcpy(sunaddr, addr->name, *uaddr_len);
1267 }
1268 unix_state_unlock(sk);
1269 sock_put(sk);
1270 out:
1271 return err;
1272 }
1273
1274 static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1275 {
1276 int i;
1277
1278 scm->fp = UNIXCB(skb).fp;
1279 skb->destructor = sock_wfree;
1280 UNIXCB(skb).fp = NULL;
1281
1282 for (i=scm->fp->count-1; i>=0; i--)
1283 unix_notinflight(scm->fp->fp[i]);
1284 }
1285
1286 static void unix_destruct_fds(struct sk_buff *skb)
1287 {
1288 struct scm_cookie scm;
1289 memset(&scm, 0, sizeof(scm));
1290 unix_detach_fds(&scm, skb);
1291
1292 /* Alas, it calls VFS */
1293 /* So fscking what? fput() had been SMP-safe since the last Summer */
1294 scm_destroy(&scm);
1295 sock_wfree(skb);
1296 }
1297
1298 static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1299 {
1300 int i;
1301 for (i=scm->fp->count-1; i>=0; i--)
1302 unix_inflight(scm->fp->fp[i]);
1303 UNIXCB(skb).fp = scm->fp;
1304 skb->destructor = unix_destruct_fds;
1305 scm->fp = NULL;
1306 }
1307
1308 /*
1309 * Send AF_UNIX data.
1310 */
1311
1312 static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
1313 struct msghdr *msg, size_t len)
1314 {
1315 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1316 struct sock *sk = sock->sk;
1317 struct net *net = sock_net(sk);
1318 struct unix_sock *u = unix_sk(sk);
1319 struct sockaddr_un *sunaddr=msg->msg_name;
1320 struct sock *other = NULL;
1321 int namelen = 0; /* fake GCC */
1322 int err;
1323 unsigned hash;
1324 struct sk_buff *skb;
1325 long timeo;
1326 struct scm_cookie tmp_scm;
1327
1328 if (NULL == siocb->scm)
1329 siocb->scm = &tmp_scm;
1330 err = scm_send(sock, msg, siocb->scm);
1331 if (err < 0)
1332 return err;
1333
1334 err = -EOPNOTSUPP;
1335 if (msg->msg_flags&MSG_OOB)
1336 goto out;
1337
1338 if (msg->msg_namelen) {
1339 err = unix_mkname(sunaddr, msg->msg_namelen, &hash);
1340 if (err < 0)
1341 goto out;
1342 namelen = err;
1343 } else {
1344 sunaddr = NULL;
1345 err = -ENOTCONN;
1346 other = unix_peer_get(sk);
1347 if (!other)
1348 goto out;
1349 }
1350
1351 if (test_bit(SOCK_PASSCRED, &sock->flags)
1352 && !u->addr && (err = unix_autobind(sock)) != 0)
1353 goto out;
1354
1355 err = -EMSGSIZE;
1356 if (len > sk->sk_sndbuf - 32)
1357 goto out;
1358
1359 skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err);
1360 if (skb==NULL)
1361 goto out;
1362
1363 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1364 if (siocb->scm->fp)
1365 unix_attach_fds(siocb->scm, skb);
1366 unix_get_secdata(siocb->scm, skb);
1367
1368 skb_reset_transport_header(skb);
1369 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
1370 if (err)
1371 goto out_free;
1372
1373 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1374
1375 restart:
1376 if (!other) {
1377 err = -ECONNRESET;
1378 if (sunaddr == NULL)
1379 goto out_free;
1380
1381 other = unix_find_other(net, sunaddr, namelen, sk->sk_type,
1382 hash, &err);
1383 if (other==NULL)
1384 goto out_free;
1385 }
1386
1387 unix_state_lock(other);
1388 err = -EPERM;
1389 if (!unix_may_send(sk, other))
1390 goto out_unlock;
1391
1392 if (sock_flag(other, SOCK_DEAD)) {
1393 /*
1394 * Check with 1003.1g - what should
1395 * datagram error
1396 */
1397 unix_state_unlock(other);
1398 sock_put(other);
1399
1400 err = 0;
1401 unix_state_lock(sk);
1402 if (unix_peer(sk) == other) {
1403 unix_peer(sk)=NULL;
1404 unix_state_unlock(sk);
1405
1406 unix_dgram_disconnected(sk, other);
1407 sock_put(other);
1408 err = -ECONNREFUSED;
1409 } else {
1410 unix_state_unlock(sk);
1411 }
1412
1413 other = NULL;
1414 if (err)
1415 goto out_free;
1416 goto restart;
1417 }
1418
1419 err = -EPIPE;
1420 if (other->sk_shutdown & RCV_SHUTDOWN)
1421 goto out_unlock;
1422
1423 if (sk->sk_type != SOCK_SEQPACKET) {
1424 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
1425 if (err)
1426 goto out_unlock;
1427 }
1428
1429 if (unix_peer(other) != sk &&
1430 (skb_queue_len(&other->sk_receive_queue) >
1431 other->sk_max_ack_backlog)) {
1432 if (!timeo) {
1433 err = -EAGAIN;
1434 goto out_unlock;
1435 }
1436
1437 timeo = unix_wait_for_peer(other, timeo);
1438
1439 err = sock_intr_errno(timeo);
1440 if (signal_pending(current))
1441 goto out_free;
1442
1443 goto restart;
1444 }
1445
1446 skb_queue_tail(&other->sk_receive_queue, skb);
1447 unix_state_unlock(other);
1448 other->sk_data_ready(other, len);
1449 sock_put(other);
1450 scm_destroy(siocb->scm);
1451 return len;
1452
1453 out_unlock:
1454 unix_state_unlock(other);
1455 out_free:
1456 kfree_skb(skb);
1457 out:
1458 if (other)
1459 sock_put(other);
1460 scm_destroy(siocb->scm);
1461 return err;
1462 }
1463
1464
1465 static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
1466 struct msghdr *msg, size_t len)
1467 {
1468 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1469 struct sock *sk = sock->sk;
1470 struct sock *other = NULL;
1471 struct sockaddr_un *sunaddr=msg->msg_name;
1472 int err,size;
1473 struct sk_buff *skb;
1474 int sent=0;
1475 struct scm_cookie tmp_scm;
1476
1477 if (NULL == siocb->scm)
1478 siocb->scm = &tmp_scm;
1479 err = scm_send(sock, msg, siocb->scm);
1480 if (err < 0)
1481 return err;
1482
1483 err = -EOPNOTSUPP;
1484 if (msg->msg_flags&MSG_OOB)
1485 goto out_err;
1486
1487 if (msg->msg_namelen) {
1488 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
1489 goto out_err;
1490 } else {
1491 sunaddr = NULL;
1492 err = -ENOTCONN;
1493 other = unix_peer(sk);
1494 if (!other)
1495 goto out_err;
1496 }
1497
1498 if (sk->sk_shutdown & SEND_SHUTDOWN)
1499 goto pipe_err;
1500
1501 while(sent < len)
1502 {
1503 /*
1504 * Optimisation for the fact that under 0.01% of X
1505 * messages typically need breaking up.
1506 */
1507
1508 size = len-sent;
1509
1510 /* Keep two messages in the pipe so it schedules better */
1511 if (size > ((sk->sk_sndbuf >> 1) - 64))
1512 size = (sk->sk_sndbuf >> 1) - 64;
1513
1514 if (size > SKB_MAX_ALLOC)
1515 size = SKB_MAX_ALLOC;
1516
1517 /*
1518 * Grab a buffer
1519 */
1520
1521 skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err);
1522
1523 if (skb==NULL)
1524 goto out_err;
1525
1526 /*
1527 * If you pass two values to the sock_alloc_send_skb
1528 * it tries to grab the large buffer with GFP_NOFS
1529 * (which can fail easily), and if it fails grab the
1530 * fallback size buffer which is under a page and will
1531 * succeed. [Alan]
1532 */
1533 size = min_t(int, size, skb_tailroom(skb));
1534
1535 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1536 if (siocb->scm->fp)
1537 unix_attach_fds(siocb->scm, skb);
1538
1539 if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) {
1540 kfree_skb(skb);
1541 goto out_err;
1542 }
1543
1544 unix_state_lock(other);
1545
1546 if (sock_flag(other, SOCK_DEAD) ||
1547 (other->sk_shutdown & RCV_SHUTDOWN))
1548 goto pipe_err_free;
1549
1550 skb_queue_tail(&other->sk_receive_queue, skb);
1551 unix_state_unlock(other);
1552 other->sk_data_ready(other, size);
1553 sent+=size;
1554 }
1555
1556 scm_destroy(siocb->scm);
1557 siocb->scm = NULL;
1558
1559 return sent;
1560
1561 pipe_err_free:
1562 unix_state_unlock(other);
1563 kfree_skb(skb);
1564 pipe_err:
1565 if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL))
1566 send_sig(SIGPIPE,current,0);
1567 err = -EPIPE;
1568 out_err:
1569 scm_destroy(siocb->scm);
1570 siocb->scm = NULL;
1571 return sent ? : err;
1572 }
1573
1574 static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock,
1575 struct msghdr *msg, size_t len)
1576 {
1577 int err;
1578 struct sock *sk = sock->sk;
1579
1580 err = sock_error(sk);
1581 if (err)
1582 return err;
1583
1584 if (sk->sk_state != TCP_ESTABLISHED)
1585 return -ENOTCONN;
1586
1587 if (msg->msg_namelen)
1588 msg->msg_namelen = 0;
1589
1590 return unix_dgram_sendmsg(kiocb, sock, msg, len);
1591 }
1592
1593 static void unix_copy_addr(struct msghdr *msg, struct sock *sk)
1594 {
1595 struct unix_sock *u = unix_sk(sk);
1596
1597 msg->msg_namelen = 0;
1598 if (u->addr) {
1599 msg->msg_namelen = u->addr->len;
1600 memcpy(msg->msg_name, u->addr->name, u->addr->len);
1601 }
1602 }
1603
1604 static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
1605 struct msghdr *msg, size_t size,
1606 int flags)
1607 {
1608 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1609 struct scm_cookie tmp_scm;
1610 struct sock *sk = sock->sk;
1611 struct unix_sock *u = unix_sk(sk);
1612 int noblock = flags & MSG_DONTWAIT;
1613 struct sk_buff *skb;
1614 int err;
1615
1616 err = -EOPNOTSUPP;
1617 if (flags&MSG_OOB)
1618 goto out;
1619
1620 msg->msg_namelen = 0;
1621
1622 mutex_lock(&u->readlock);
1623
1624 skb = skb_recv_datagram(sk, flags, noblock, &err);
1625 if (!skb) {
1626 unix_state_lock(sk);
1627 /* Signal EOF on disconnected non-blocking SEQPACKET socket. */
1628 if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN &&
1629 (sk->sk_shutdown & RCV_SHUTDOWN))
1630 err = 0;
1631 unix_state_unlock(sk);
1632 goto out_unlock;
1633 }
1634
1635 wake_up_interruptible_sync(&u->peer_wait);
1636
1637 if (msg->msg_name)
1638 unix_copy_addr(msg, skb->sk);
1639
1640 if (size > skb->len)
1641 size = skb->len;
1642 else if (size < skb->len)
1643 msg->msg_flags |= MSG_TRUNC;
1644
1645 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size);
1646 if (err)
1647 goto out_free;
1648
1649 if (!siocb->scm) {
1650 siocb->scm = &tmp_scm;
1651 memset(&tmp_scm, 0, sizeof(tmp_scm));
1652 }
1653 siocb->scm->creds = *UNIXCREDS(skb);
1654 unix_set_secdata(siocb->scm, skb);
1655
1656 if (!(flags & MSG_PEEK))
1657 {
1658 if (UNIXCB(skb).fp)
1659 unix_detach_fds(siocb->scm, skb);
1660 }
1661 else
1662 {
1663 /* It is questionable: on PEEK we could:
1664 - do not return fds - good, but too simple 8)
1665 - return fds, and do not return them on read (old strategy,
1666 apparently wrong)
1667 - clone fds (I chose it for now, it is the most universal
1668 solution)
1669
1670 POSIX 1003.1g does not actually define this clearly
1671 at all. POSIX 1003.1g doesn't define a lot of things
1672 clearly however!
1673
1674 */
1675 if (UNIXCB(skb).fp)
1676 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1677 }
1678 err = size;
1679
1680 scm_recv(sock, msg, siocb->scm, flags);
1681
1682 out_free:
1683 skb_free_datagram(sk,skb);
1684 out_unlock:
1685 mutex_unlock(&u->readlock);
1686 out:
1687 return err;
1688 }
1689
1690 /*
1691 * Sleep until data has arrive. But check for races..
1692 */
1693
1694 static long unix_stream_data_wait(struct sock * sk, long timeo)
1695 {
1696 DEFINE_WAIT(wait);
1697
1698 unix_state_lock(sk);
1699
1700 for (;;) {
1701 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1702
1703 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1704 sk->sk_err ||
1705 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1706 signal_pending(current) ||
1707 !timeo)
1708 break;
1709
1710 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1711 unix_state_unlock(sk);
1712 timeo = schedule_timeout(timeo);
1713 unix_state_lock(sk);
1714 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1715 }
1716
1717 finish_wait(sk->sk_sleep, &wait);
1718 unix_state_unlock(sk);
1719 return timeo;
1720 }
1721
1722
1723
1724 static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
1725 struct msghdr *msg, size_t size,
1726 int flags)
1727 {
1728 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1729 struct scm_cookie tmp_scm;
1730 struct sock *sk = sock->sk;
1731 struct unix_sock *u = unix_sk(sk);
1732 struct sockaddr_un *sunaddr=msg->msg_name;
1733 int copied = 0;
1734 int check_creds = 0;
1735 int target;
1736 int err = 0;
1737 long timeo;
1738
1739 err = -EINVAL;
1740 if (sk->sk_state != TCP_ESTABLISHED)
1741 goto out;
1742
1743 err = -EOPNOTSUPP;
1744 if (flags&MSG_OOB)
1745 goto out;
1746
1747 target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
1748 timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
1749
1750 msg->msg_namelen = 0;
1751
1752 /* Lock the socket to prevent queue disordering
1753 * while sleeps in memcpy_tomsg
1754 */
1755
1756 if (!siocb->scm) {
1757 siocb->scm = &tmp_scm;
1758 memset(&tmp_scm, 0, sizeof(tmp_scm));
1759 }
1760
1761 mutex_lock(&u->readlock);
1762
1763 do
1764 {
1765 int chunk;
1766 struct sk_buff *skb;
1767
1768 unix_state_lock(sk);
1769 skb = skb_dequeue(&sk->sk_receive_queue);
1770 if (skb==NULL)
1771 {
1772 if (copied >= target)
1773 goto unlock;
1774
1775 /*
1776 * POSIX 1003.1g mandates this order.
1777 */
1778
1779 if ((err = sock_error(sk)) != 0)
1780 goto unlock;
1781 if (sk->sk_shutdown & RCV_SHUTDOWN)
1782 goto unlock;
1783
1784 unix_state_unlock(sk);
1785 err = -EAGAIN;
1786 if (!timeo)
1787 break;
1788 mutex_unlock(&u->readlock);
1789
1790 timeo = unix_stream_data_wait(sk, timeo);
1791
1792 if (signal_pending(current)) {
1793 err = sock_intr_errno(timeo);
1794 goto out;
1795 }
1796 mutex_lock(&u->readlock);
1797 continue;
1798 unlock:
1799 unix_state_unlock(sk);
1800 break;
1801 }
1802 unix_state_unlock(sk);
1803
1804 if (check_creds) {
1805 /* Never glue messages from different writers */
1806 if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) {
1807 skb_queue_head(&sk->sk_receive_queue, skb);
1808 break;
1809 }
1810 } else {
1811 /* Copy credentials */
1812 siocb->scm->creds = *UNIXCREDS(skb);
1813 check_creds = 1;
1814 }
1815
1816 /* Copy address just once */
1817 if (sunaddr)
1818 {
1819 unix_copy_addr(msg, skb->sk);
1820 sunaddr = NULL;
1821 }
1822
1823 chunk = min_t(unsigned int, skb->len, size);
1824 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1825 skb_queue_head(&sk->sk_receive_queue, skb);
1826 if (copied == 0)
1827 copied = -EFAULT;
1828 break;
1829 }
1830 copied += chunk;
1831 size -= chunk;
1832
1833 /* Mark read part of skb as used */
1834 if (!(flags & MSG_PEEK))
1835 {
1836 skb_pull(skb, chunk);
1837
1838 if (UNIXCB(skb).fp)
1839 unix_detach_fds(siocb->scm, skb);
1840
1841 /* put the skb back if we didn't use it up.. */
1842 if (skb->len)
1843 {
1844 skb_queue_head(&sk->sk_receive_queue, skb);
1845 break;
1846 }
1847
1848 kfree_skb(skb);
1849
1850 if (siocb->scm->fp)
1851 break;
1852 }
1853 else
1854 {
1855 /* It is questionable, see note in unix_dgram_recvmsg.
1856 */
1857 if (UNIXCB(skb).fp)
1858 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1859
1860 /* put message back and return */
1861 skb_queue_head(&sk->sk_receive_queue, skb);
1862 break;
1863 }
1864 } while (size);
1865
1866 mutex_unlock(&u->readlock);
1867 scm_recv(sock, msg, siocb->scm, flags);
1868 out:
1869 return copied ? : err;
1870 }
1871
1872 static int unix_shutdown(struct socket *sock, int mode)
1873 {
1874 struct sock *sk = sock->sk;
1875 struct sock *other;
1876
1877 mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);
1878
1879 if (mode) {
1880 unix_state_lock(sk);
1881 sk->sk_shutdown |= mode;
1882 other=unix_peer(sk);
1883 if (other)
1884 sock_hold(other);
1885 unix_state_unlock(sk);
1886 sk->sk_state_change(sk);
1887
1888 if (other &&
1889 (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) {
1890
1891 int peer_mode = 0;
1892
1893 if (mode&RCV_SHUTDOWN)
1894 peer_mode |= SEND_SHUTDOWN;
1895 if (mode&SEND_SHUTDOWN)
1896 peer_mode |= RCV_SHUTDOWN;
1897 unix_state_lock(other);
1898 other->sk_shutdown |= peer_mode;
1899 unix_state_unlock(other);
1900 other->sk_state_change(other);
1901 read_lock(&other->sk_callback_lock);
1902 if (peer_mode == SHUTDOWN_MASK)
1903 sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP);
1904 else if (peer_mode & RCV_SHUTDOWN)
1905 sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN);
1906 read_unlock(&other->sk_callback_lock);
1907 }
1908 if (other)
1909 sock_put(other);
1910 }
1911 return 0;
1912 }
1913
1914 static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1915 {
1916 struct sock *sk = sock->sk;
1917 long amount=0;
1918 int err;
1919
1920 switch(cmd)
1921 {
1922 case SIOCOUTQ:
1923 amount = atomic_read(&sk->sk_wmem_alloc);
1924 err = put_user(amount, (int __user *)arg);
1925 break;
1926 case SIOCINQ:
1927 {
1928 struct sk_buff *skb;
1929
1930 if (sk->sk_state == TCP_LISTEN) {
1931 err = -EINVAL;
1932 break;
1933 }
1934
1935 spin_lock(&sk->sk_receive_queue.lock);
1936 if (sk->sk_type == SOCK_STREAM ||
1937 sk->sk_type == SOCK_SEQPACKET) {
1938 skb_queue_walk(&sk->sk_receive_queue, skb)
1939 amount += skb->len;
1940 } else {
1941 skb = skb_peek(&sk->sk_receive_queue);
1942 if (skb)
1943 amount=skb->len;
1944 }
1945 spin_unlock(&sk->sk_receive_queue.lock);
1946 err = put_user(amount, (int __user *)arg);
1947 break;
1948 }
1949
1950 default:
1951 err = -ENOIOCTLCMD;
1952 break;
1953 }
1954 return err;
1955 }
1956
1957 static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait)
1958 {
1959 struct sock *sk = sock->sk;
1960 unsigned int mask;
1961
1962 poll_wait(file, sk->sk_sleep, wait);
1963 mask = 0;
1964
1965 /* exceptional events? */
1966 if (sk->sk_err)
1967 mask |= POLLERR;
1968 if (sk->sk_shutdown == SHUTDOWN_MASK)
1969 mask |= POLLHUP;
1970 if (sk->sk_shutdown & RCV_SHUTDOWN)
1971 mask |= POLLRDHUP;
1972
1973 /* readable? */
1974 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1975 (sk->sk_shutdown & RCV_SHUTDOWN))
1976 mask |= POLLIN | POLLRDNORM;
1977
1978 /* Connection-based need to check for termination and startup */
1979 if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE)
1980 mask |= POLLHUP;
1981
1982 /*
1983 * we set writable also when the other side has shut down the
1984 * connection. This prevents stuck sockets.
1985 */
1986 if (unix_writable(sk))
1987 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1988
1989 return mask;
1990 }
1991
1992
1993 #ifdef CONFIG_PROC_FS
1994 static struct sock *first_unix_socket(int *i)
1995 {
1996 for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
1997 if (!hlist_empty(&unix_socket_table[*i]))
1998 return __sk_head(&unix_socket_table[*i]);
1999 }
2000 return NULL;
2001 }
2002
2003 static struct sock *next_unix_socket(int *i, struct sock *s)
2004 {
2005 struct sock *next = sk_next(s);
2006 /* More in this chain? */
2007 if (next)
2008 return next;
2009 /* Look for next non-empty chain. */
2010 for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
2011 if (!hlist_empty(&unix_socket_table[*i]))
2012 return __sk_head(&unix_socket_table[*i]);
2013 }
2014 return NULL;
2015 }
2016
2017 struct unix_iter_state {
2018 struct seq_net_private p;
2019 int i;
2020 };
2021 static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos)
2022 {
2023 struct unix_iter_state *iter = seq->private;
2024 loff_t off = 0;
2025 struct sock *s;
2026
2027 for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) {
2028 if (sock_net(s) != seq_file_net(seq))
2029 continue;
2030 if (off == pos)
2031 return s;
2032 ++off;
2033 }
2034 return NULL;
2035 }
2036
2037
2038 static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
2039 __acquires(unix_table_lock)
2040 {
2041 spin_lock(&unix_table_lock);
2042 return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2043 }
2044
2045 static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2046 {
2047 struct unix_iter_state *iter = seq->private;
2048 struct sock *sk = v;
2049 ++*pos;
2050
2051 if (v == SEQ_START_TOKEN)
2052 sk = first_unix_socket(&iter->i);
2053 else
2054 sk = next_unix_socket(&iter->i, sk);
2055 while (sk && (sock_net(sk) != seq_file_net(seq)))
2056 sk = next_unix_socket(&iter->i, sk);
2057 return sk;
2058 }
2059
2060 static void unix_seq_stop(struct seq_file *seq, void *v)
2061 __releases(unix_table_lock)
2062 {
2063 spin_unlock(&unix_table_lock);
2064 }
2065
2066 static int unix_seq_show(struct seq_file *seq, void *v)
2067 {
2068
2069 if (v == SEQ_START_TOKEN)
2070 seq_puts(seq, "Num RefCount Protocol Flags Type St "
2071 "Inode Path\n");
2072 else {
2073 struct sock *s = v;
2074 struct unix_sock *u = unix_sk(s);
2075 unix_state_lock(s);
2076
2077 seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu",
2078 s,
2079 atomic_read(&s->sk_refcnt),
2080 0,
2081 s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0,
2082 s->sk_type,
2083 s->sk_socket ?
2084 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) :
2085 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING),
2086 sock_i_ino(s));
2087
2088 if (u->addr) {
2089 int i, len;
2090 seq_putc(seq, ' ');
2091
2092 i = 0;
2093 len = u->addr->len - sizeof(short);
2094 if (!UNIX_ABSTRACT(s))
2095 len--;
2096 else {
2097 seq_putc(seq, '@');
2098 i++;
2099 }
2100 for ( ; i < len; i++)
2101 seq_putc(seq, u->addr->name->sun_path[i]);
2102 }
2103 unix_state_unlock(s);
2104 seq_putc(seq, '\n');
2105 }
2106
2107 return 0;
2108 }
2109
2110 static const struct seq_operations unix_seq_ops = {
2111 .start = unix_seq_start,
2112 .next = unix_seq_next,
2113 .stop = unix_seq_stop,
2114 .show = unix_seq_show,
2115 };
2116
2117
2118 static int unix_seq_open(struct inode *inode, struct file *file)
2119 {
2120 return seq_open_net(inode, file, &unix_seq_ops,
2121 sizeof(struct unix_iter_state));
2122 }
2123
2124 static const struct file_operations unix_seq_fops = {
2125 .owner = THIS_MODULE,
2126 .open = unix_seq_open,
2127 .read = seq_read,
2128 .llseek = seq_lseek,
2129 .release = seq_release_net,
2130 };
2131
2132 #endif
2133
2134 static struct net_proto_family unix_family_ops = {
2135 .family = PF_UNIX,
2136 .create = unix_create,
2137 .owner = THIS_MODULE,
2138 };
2139
2140
2141 static int unix_net_init(struct net *net)
2142 {
2143 int error = -ENOMEM;
2144
2145 net->unx.sysctl_max_dgram_qlen = 10;
2146 if (unix_sysctl_register(net))
2147 goto out;
2148
2149 #ifdef CONFIG_PROC_FS
2150 if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) {
2151 unix_sysctl_unregister(net);
2152 goto out;
2153 }
2154 #endif
2155 error = 0;
2156 out:
2157 return 0;
2158 }
2159
2160 static void unix_net_exit(struct net *net)
2161 {
2162 unix_sysctl_unregister(net);
2163 proc_net_remove(net, "unix");
2164 }
2165
2166 static struct pernet_operations unix_net_ops = {
2167 .init = unix_net_init,
2168 .exit = unix_net_exit,
2169 };
2170
2171 static int __init af_unix_init(void)
2172 {
2173 int rc = -1;
2174 struct sk_buff *dummy_skb;
2175
2176 BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb));
2177
2178 rc = proto_register(&unix_proto, 1);
2179 if (rc != 0) {
2180 printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n",
2181 __func__);
2182 goto out;
2183 }
2184
2185 sock_register(&unix_family_ops);
2186 register_pernet_subsys(&unix_net_ops);
2187 out:
2188 return rc;
2189 }
2190
2191 static void __exit af_unix_exit(void)
2192 {
2193 sock_unregister(PF_UNIX);
2194 proto_unregister(&unix_proto);
2195 unregister_pernet_subsys(&unix_net_ops);
2196 }
2197
2198 /* Earlier than device_initcall() so that other drivers invoking
2199 request_module() don't end up in a loop when modprobe tries
2200 to use a UNIX socket. But later than subsys_initcall() because
2201 we depend on stuff initialised there */
2202 fs_initcall(af_unix_init);
2203 module_exit(af_unix_exit);
2204
2205 MODULE_LICENSE("GPL");
2206 MODULE_ALIAS_NETPROTO(PF_UNIX);
Linux kernel - Deliverables
This page took 0.079631 seconds and 5 git commands to generate.