blob: eacddb21a9b458af795a64156d1d81727403938e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 * Version: $Id: af_unix.c,v 1.133 2002/02/08 03:57:19 davem Exp $
12 *
13 * Fixes:
14 * Linus Torvalds : Assorted bug cures.
15 * Niibe Yutaka : async I/O support.
16 * Carsten Paeth : PF_UNIX check, address fixes.
17 * Alan Cox : Limit size of allocated blocks.
18 * Alan Cox : Fixed the stupid socketpair bug.
19 * Alan Cox : BSD compatibility fine tuning.
20 * Alan Cox : Fixed a bug in connect when interrupted.
21 * Alan Cox : Sorted out a proper draft version of
22 * file descriptor passing hacked up from
23 * Mike Shaver's work.
24 * Marty Leisner : Fixes to fd passing
25 * Nick Nevin : recvmsg bugfix.
26 * Alan Cox : Started proper garbage collector
27 * Heiko EiBfeldt : Missing verify_area check
28 * Alan Cox : Started POSIXisms
29 * Andreas Schwab : Replace inode by dentry for proper
30 * reference counting
31 * Kirk Petersen : Made this a module
32 * Christoph Rohland : Elegant non-blocking accept/connect algorithm.
33 * Lots of bug fixes.
34 * Alexey Kuznetosv : Repaired (I hope) bugs introduces
35 * by above two patches.
36 * Andrea Arcangeli : If possible we block in connect(2)
37 * if the max backlog of the listen socket
38 * is been reached. This won't break
39 * old apps and it will avoid huge amount
40 * of socks hashed (this for unix_gc()
41 * performances reasons).
42 * Security fix that limits the max
43 * number of socks to 2*max_files and
44 * the number of skb queueable in the
45 * dgram receiver.
46 * Artur Skawina : Hash function optimizations
47 * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8)
48 * Malcolm Beattie : Set peercred for socketpair
49 * Michal Ostrowski : Module initialization cleanup.
50 * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT,
51 * the core infrastructure is doing that
52 * for all net proto families now (2.5.69+)
53 *
54 *
55 * Known differences from reference BSD that was tested:
56 *
57 * [TO FIX]
58 * ECONNREFUSED is not returned from one end of a connected() socket to the
59 * other the moment one end closes.
60 * fstat() doesn't return st_dev=0, and give the blksize as high water mark
61 * and a fake inode identifier (nor the BSD first socket fstat twice bug).
62 * [NOT TO FIX]
63 * accept() returns a path name even if the connecting socket has closed
64 * in the meantime (BSD loses the path and gives up).
65 * accept() returns 0 length path for an unbound connector. BSD returns 16
66 * and a null first byte in the path (but not for gethost/peername - BSD bug ??)
67 * socketpair(...SOCK_RAW..) doesn't panic the kernel.
68 * BSD af_unix apparently has connect forgetting to block properly.
69 * (need to check this with the POSIX spec in detail)
70 *
71 * Differences from 2.0.0-11-... (ANK)
72 * Bug fixes and improvements.
73 * - client shutdown killed server socket.
74 * - removed all useless cli/sti pairs.
75 *
76 * Semantic changes/extensions.
77 * - generic control message passing.
78 * - SCM_CREDENTIALS control message.
79 * - "Abstract" (not FS based) socket bindings.
80 * Abstract names are sequences of bytes (not zero terminated)
81 * started by 0, so that this name space does not intersect
82 * with BSD names.
83 */
84
85#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070086#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#include <linux/signal.h>
88#include <linux/sched.h>
89#include <linux/errno.h>
90#include <linux/string.h>
91#include <linux/stat.h>
92#include <linux/dcache.h>
93#include <linux/namei.h>
94#include <linux/socket.h>
95#include <linux/un.h>
96#include <linux/fcntl.h>
97#include <linux/termios.h>
98#include <linux/sockios.h>
99#include <linux/net.h>
100#include <linux/in.h>
101#include <linux/fs.h>
102#include <linux/slab.h>
103#include <asm/uaccess.h>
104#include <linux/skbuff.h>
105#include <linux/netdevice.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200106#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#include <net/sock.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -0700108#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109#include <net/af_unix.h>
110#include <linux/proc_fs.h>
111#include <linux/seq_file.h>
112#include <net/scm.h>
113#include <linux/init.h>
114#include <linux/poll.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <linux/rtnetlink.h>
116#include <linux/mount.h>
117#include <net/checksum.h>
118#include <linux/security.h>
119
Brian Haley18adaf02006-08-31 15:03:36 -0700120int sysctl_unix_max_dgram_qlen __read_mostly = 10;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Adrian Bunk13111692007-07-30 18:05:45 -0700122static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
123static DEFINE_SPINLOCK(unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124static atomic_t unix_nr_socks = ATOMIC_INIT(0);
125
126#define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
127
128#define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE)
129
Adrian Bunk13111692007-07-30 18:05:45 -0700130static struct sock *first_unix_socket(int *i)
131{
132 for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) {
133 if (!hlist_empty(&unix_socket_table[*i]))
134 return __sk_head(&unix_socket_table[*i]);
135 }
136 return NULL;
137}
138
139static struct sock *next_unix_socket(int *i, struct sock *s)
140{
141 struct sock *next = sk_next(s);
142 /* More in this chain? */
143 if (next)
144 return next;
145 /* Look for next non-empty chain. */
146 for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) {
147 if (!hlist_empty(&unix_socket_table[*i]))
148 return __sk_head(&unix_socket_table[*i]);
149 }
150 return NULL;
151}
152
153#define forall_unix_sockets(i, s) \
154 for (s = first_unix_socket(&(i)); s; s = next_unix_socket(&(i),(s)))
155
Catherine Zhang877ce7c2006-06-29 12:27:47 -0700156#ifdef CONFIG_SECURITY_NETWORK
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700157static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
Catherine Zhang877ce7c2006-06-29 12:27:47 -0700158{
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700159 memcpy(UNIXSID(skb), &scm->secid, sizeof(u32));
Catherine Zhang877ce7c2006-06-29 12:27:47 -0700160}
161
162static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
163{
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700164 scm->secid = *UNIXSID(skb);
Catherine Zhang877ce7c2006-06-29 12:27:47 -0700165}
166#else
Catherine Zhangdc49c1f2006-08-02 14:12:06 -0700167static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)
Catherine Zhang877ce7c2006-06-29 12:27:47 -0700168{ }
169
170static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)
171{ }
172#endif /* CONFIG_SECURITY_NETWORK */
173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174/*
175 * SMP locking strategy:
David S. Millerfbe9cc42005-12-13 23:26:29 -0800176 * hash table is protected with spinlock unix_table_lock
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * each socket state is protected by separate rwlock.
178 */
179
Al Viro44bb9362006-11-14 21:36:14 -0800180static inline unsigned unix_hash_fold(__wsum n)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181{
Al Viro44bb9362006-11-14 21:36:14 -0800182 unsigned hash = (__force unsigned)n;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 hash ^= hash>>16;
184 hash ^= hash>>8;
185 return hash&(UNIX_HASH_SIZE-1);
186}
187
188#define unix_peer(sk) (unix_sk(sk)->peer)
189
190static inline int unix_our_peer(struct sock *sk, struct sock *osk)
191{
192 return unix_peer(osk) == sk;
193}
194
195static inline int unix_may_send(struct sock *sk, struct sock *osk)
196{
197 return (unix_peer(osk) == NULL || unix_our_peer(sk, osk));
198}
199
200static struct sock *unix_peer_get(struct sock *s)
201{
202 struct sock *peer;
203
David S. Miller1c92b4e2007-05-31 13:24:26 -0700204 unix_state_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 peer = unix_peer(s);
206 if (peer)
207 sock_hold(peer);
David S. Miller1c92b4e2007-05-31 13:24:26 -0700208 unix_state_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 return peer;
210}
211
212static inline void unix_release_addr(struct unix_address *addr)
213{
214 if (atomic_dec_and_test(&addr->refcnt))
215 kfree(addr);
216}
217
218/*
219 * Check unix socket name:
220 * - should be not zero length.
221 * - if started by not zero, should be NULL terminated (FS object)
222 * - if started by zero, it is abstract name.
223 */
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +0900224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp)
226{
227 if (len <= sizeof(short) || len > sizeof(*sunaddr))
228 return -EINVAL;
229 if (!sunaddr || sunaddr->sun_family != AF_UNIX)
230 return -EINVAL;
231 if (sunaddr->sun_path[0]) {
232 /*
233 * This may look like an off by one error but it is a bit more
234 * subtle. 108 is the longest valid AF_UNIX path for a binding.
235 * sun_path[108] doesnt as such exist. However in kernel space
236 * we are guaranteed that it is a valid memory location in our
237 * kernel address buffer.
238 */
239 ((char *)sunaddr)[len]=0;
240 len = strlen(sunaddr->sun_path)+1+sizeof(short);
241 return len;
242 }
243
244 *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0));
245 return len;
246}
247
248static void __unix_remove_socket(struct sock *sk)
249{
250 sk_del_node_init(sk);
251}
252
253static void __unix_insert_socket(struct hlist_head *list, struct sock *sk)
254{
255 BUG_TRAP(sk_unhashed(sk));
256 sk_add_node(sk, list);
257}
258
259static inline void unix_remove_socket(struct sock *sk)
260{
David S. Millerfbe9cc42005-12-13 23:26:29 -0800261 spin_lock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 __unix_remove_socket(sk);
David S. Millerfbe9cc42005-12-13 23:26:29 -0800263 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
266static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk)
267{
David S. Millerfbe9cc42005-12-13 23:26:29 -0800268 spin_lock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 __unix_insert_socket(list, sk);
David S. Millerfbe9cc42005-12-13 23:26:29 -0800270 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800273static struct sock *__unix_find_socket_byname(struct net *net,
274 struct sockaddr_un *sunname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 int len, int type, unsigned hash)
276{
277 struct sock *s;
278 struct hlist_node *node;
279
280 sk_for_each(s, node, &unix_socket_table[hash ^ type]) {
281 struct unix_sock *u = unix_sk(s);
282
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800283 if (s->sk_net != net)
284 continue;
285
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 if (u->addr->len == len &&
287 !memcmp(u->addr->name, sunname, len))
288 goto found;
289 }
290 s = NULL;
291found:
292 return s;
293}
294
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800295static inline struct sock *unix_find_socket_byname(struct net *net,
296 struct sockaddr_un *sunname,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 int len, int type,
298 unsigned hash)
299{
300 struct sock *s;
301
David S. Millerfbe9cc42005-12-13 23:26:29 -0800302 spin_lock(&unix_table_lock);
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800303 s = __unix_find_socket_byname(net, sunname, len, type, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (s)
305 sock_hold(s);
David S. Millerfbe9cc42005-12-13 23:26:29 -0800306 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 return s;
308}
309
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800310static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
312 struct sock *s;
313 struct hlist_node *node;
314
David S. Millerfbe9cc42005-12-13 23:26:29 -0800315 spin_lock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 sk_for_each(s, node,
317 &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) {
318 struct dentry *dentry = unix_sk(s)->dentry;
319
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800320 if (s->sk_net != net)
321 continue;
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 if(dentry && dentry->d_inode == i)
324 {
325 sock_hold(s);
326 goto found;
327 }
328 }
329 s = NULL;
330found:
David S. Millerfbe9cc42005-12-13 23:26:29 -0800331 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return s;
333}
334
335static inline int unix_writable(struct sock *sk)
336{
337 return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf;
338}
339
340static void unix_write_space(struct sock *sk)
341{
342 read_lock(&sk->sk_callback_lock);
343 if (unix_writable(sk)) {
344 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
Ingo Molnar71e20f12007-10-15 17:00:19 +0200345 wake_up_interruptible_sync(sk->sk_sleep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 sk_wake_async(sk, 2, POLL_OUT);
347 }
348 read_unlock(&sk->sk_callback_lock);
349}
350
351/* When dgram socket disconnects (or changes its peer), we clear its receive
352 * queue of packets arrived from previous peer. First, it allows to do
353 * flow control based only on wmem_alloc; second, sk connected to peer
354 * may receive messages only from that peer. */
355static void unix_dgram_disconnected(struct sock *sk, struct sock *other)
356{
David S. Millerb03efcf2005-07-08 14:57:23 -0700357 if (!skb_queue_empty(&sk->sk_receive_queue)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 skb_queue_purge(&sk->sk_receive_queue);
359 wake_up_interruptible_all(&unix_sk(sk)->peer_wait);
360
361 /* If one link of bidirectional dgram pipe is disconnected,
362 * we signal error. Messages are lost. Do not make this,
363 * when peer was not connected to us.
364 */
365 if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) {
366 other->sk_err = ECONNRESET;
367 other->sk_error_report(other);
368 }
369 }
370}
371
372static void unix_sock_destructor(struct sock *sk)
373{
374 struct unix_sock *u = unix_sk(sk);
375
376 skb_queue_purge(&sk->sk_receive_queue);
377
378 BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
379 BUG_TRAP(sk_unhashed(sk));
380 BUG_TRAP(!sk->sk_socket);
381 if (!sock_flag(sk, SOCK_DEAD)) {
382 printk("Attempt to release alive unix socket: %p\n", sk);
383 return;
384 }
385
386 if (u->addr)
387 unix_release_addr(u->addr);
388
389 atomic_dec(&unix_nr_socks);
390#ifdef UNIX_REFCNT_DEBUG
391 printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks));
392#endif
393}
394
395static int unix_release_sock (struct sock *sk, int embrion)
396{
397 struct unix_sock *u = unix_sk(sk);
398 struct dentry *dentry;
399 struct vfsmount *mnt;
400 struct sock *skpair;
401 struct sk_buff *skb;
402 int state;
403
404 unix_remove_socket(sk);
405
406 /* Clear state */
David S. Miller1c92b4e2007-05-31 13:24:26 -0700407 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 sock_orphan(sk);
409 sk->sk_shutdown = SHUTDOWN_MASK;
410 dentry = u->dentry;
411 u->dentry = NULL;
412 mnt = u->mnt;
413 u->mnt = NULL;
414 state = sk->sk_state;
415 sk->sk_state = TCP_CLOSE;
David S. Miller1c92b4e2007-05-31 13:24:26 -0700416 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417
418 wake_up_interruptible_all(&u->peer_wait);
419
420 skpair=unix_peer(sk);
421
422 if (skpair!=NULL) {
423 if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) {
David S. Miller1c92b4e2007-05-31 13:24:26 -0700424 unix_state_lock(skpair);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 /* No more writes */
426 skpair->sk_shutdown = SHUTDOWN_MASK;
427 if (!skb_queue_empty(&sk->sk_receive_queue) || embrion)
428 skpair->sk_err = ECONNRESET;
David S. Miller1c92b4e2007-05-31 13:24:26 -0700429 unix_state_unlock(skpair);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 skpair->sk_state_change(skpair);
431 read_lock(&skpair->sk_callback_lock);
432 sk_wake_async(skpair,1,POLL_HUP);
433 read_unlock(&skpair->sk_callback_lock);
434 }
435 sock_put(skpair); /* It may now die */
436 unix_peer(sk) = NULL;
437 }
438
439 /* Try to flush out this socket. Throw out buffers at least */
440
441 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
442 if (state==TCP_LISTEN)
443 unix_release_sock(skb->sk, 1);
444 /* passed fds are erased in the kfree_skb hook */
445 kfree_skb(skb);
446 }
447
448 if (dentry) {
449 dput(dentry);
450 mntput(mnt);
451 }
452
453 sock_put(sk);
454
455 /* ---- Socket is dead now and most probably destroyed ---- */
456
457 /*
458 * Fixme: BSD difference: In BSD all sockets connected to use get
459 * ECONNRESET and we die on the spot. In Linux we behave
460 * like files and pipes do and wait for the last
461 * dereference.
462 *
463 * Can't we simply set sock->err?
464 *
465 * What the above comment does talk about? --ANK(980817)
466 */
467
Pavel Emelyanov9305cfa2007-11-10 22:06:01 -0800468 if (unix_tot_inflight)
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +0900469 unix_gc(); /* Garbage collect fds */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470
471 return 0;
472}
473
474static int unix_listen(struct socket *sock, int backlog)
475{
476 int err;
477 struct sock *sk = sock->sk;
478 struct unix_sock *u = unix_sk(sk);
479
480 err = -EOPNOTSUPP;
481 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
482 goto out; /* Only stream/seqpacket sockets accept */
483 err = -EINVAL;
484 if (!u->addr)
485 goto out; /* No listens on an unbound socket */
David S. Miller1c92b4e2007-05-31 13:24:26 -0700486 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN)
488 goto out_unlock;
489 if (backlog > sk->sk_max_ack_backlog)
490 wake_up_interruptible_all(&u->peer_wait);
491 sk->sk_max_ack_backlog = backlog;
492 sk->sk_state = TCP_LISTEN;
493 /* set credentials so connect can copy them */
Pavel Emelyanovb4888932007-10-18 23:40:14 -0700494 sk->sk_peercred.pid = task_tgid_vnr(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 sk->sk_peercred.uid = current->euid;
496 sk->sk_peercred.gid = current->egid;
497 err = 0;
498
499out_unlock:
David S. Miller1c92b4e2007-05-31 13:24:26 -0700500 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501out:
502 return err;
503}
504
505static int unix_release(struct socket *);
506static int unix_bind(struct socket *, struct sockaddr *, int);
507static int unix_stream_connect(struct socket *, struct sockaddr *,
508 int addr_len, int flags);
509static int unix_socketpair(struct socket *, struct socket *);
510static int unix_accept(struct socket *, struct socket *, int);
511static int unix_getname(struct socket *, struct sockaddr *, int *, int);
512static unsigned int unix_poll(struct file *, struct socket *, poll_table *);
513static int unix_ioctl(struct socket *, unsigned int, unsigned long);
514static int unix_shutdown(struct socket *, int);
515static int unix_stream_sendmsg(struct kiocb *, struct socket *,
516 struct msghdr *, size_t);
517static int unix_stream_recvmsg(struct kiocb *, struct socket *,
518 struct msghdr *, size_t, int);
519static int unix_dgram_sendmsg(struct kiocb *, struct socket *,
520 struct msghdr *, size_t);
521static int unix_dgram_recvmsg(struct kiocb *, struct socket *,
522 struct msghdr *, size_t, int);
523static int unix_dgram_connect(struct socket *, struct sockaddr *,
524 int, int);
525static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *,
526 struct msghdr *, size_t);
527
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800528static const struct proto_ops unix_stream_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 .family = PF_UNIX,
530 .owner = THIS_MODULE,
531 .release = unix_release,
532 .bind = unix_bind,
533 .connect = unix_stream_connect,
534 .socketpair = unix_socketpair,
535 .accept = unix_accept,
536 .getname = unix_getname,
537 .poll = unix_poll,
538 .ioctl = unix_ioctl,
539 .listen = unix_listen,
540 .shutdown = unix_shutdown,
541 .setsockopt = sock_no_setsockopt,
542 .getsockopt = sock_no_getsockopt,
543 .sendmsg = unix_stream_sendmsg,
544 .recvmsg = unix_stream_recvmsg,
545 .mmap = sock_no_mmap,
546 .sendpage = sock_no_sendpage,
547};
548
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800549static const struct proto_ops unix_dgram_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 .family = PF_UNIX,
551 .owner = THIS_MODULE,
552 .release = unix_release,
553 .bind = unix_bind,
554 .connect = unix_dgram_connect,
555 .socketpair = unix_socketpair,
556 .accept = sock_no_accept,
557 .getname = unix_getname,
558 .poll = datagram_poll,
559 .ioctl = unix_ioctl,
560 .listen = sock_no_listen,
561 .shutdown = unix_shutdown,
562 .setsockopt = sock_no_setsockopt,
563 .getsockopt = sock_no_getsockopt,
564 .sendmsg = unix_dgram_sendmsg,
565 .recvmsg = unix_dgram_recvmsg,
566 .mmap = sock_no_mmap,
567 .sendpage = sock_no_sendpage,
568};
569
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800570static const struct proto_ops unix_seqpacket_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 .family = PF_UNIX,
572 .owner = THIS_MODULE,
573 .release = unix_release,
574 .bind = unix_bind,
575 .connect = unix_stream_connect,
576 .socketpair = unix_socketpair,
577 .accept = unix_accept,
578 .getname = unix_getname,
579 .poll = datagram_poll,
580 .ioctl = unix_ioctl,
581 .listen = unix_listen,
582 .shutdown = unix_shutdown,
583 .setsockopt = sock_no_setsockopt,
584 .getsockopt = sock_no_getsockopt,
585 .sendmsg = unix_seqpacket_sendmsg,
586 .recvmsg = unix_dgram_recvmsg,
587 .mmap = sock_no_mmap,
588 .sendpage = sock_no_sendpage,
589};
590
591static struct proto unix_proto = {
592 .name = "UNIX",
593 .owner = THIS_MODULE,
594 .obj_size = sizeof(struct unix_sock),
595};
596
Ingo Molnara09785a2006-07-03 00:25:12 -0700597/*
598 * AF_UNIX sockets do not interact with hardware, hence they
599 * dont trigger interrupts - so it's safe for them to have
600 * bh-unsafe locking for their sk_receive_queue.lock. Split off
601 * this special lock-class by reinitializing the spinlock key:
602 */
603static struct lock_class_key af_unix_sk_receive_queue_lock_key;
604
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700605static struct sock * unix_create1(struct net *net, struct socket *sock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
607 struct sock *sk = NULL;
608 struct unix_sock *u;
609
Pavel Emelyanov284b3272007-11-10 22:08:30 -0800610 atomic_inc(&unix_nr_socks);
611 if (atomic_read(&unix_nr_socks) > 2 * get_max_files())
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 goto out;
613
Pavel Emelyanov6257ff22007-11-01 00:39:31 -0700614 sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 if (!sk)
616 goto out;
617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 sock_init_data(sock,sk);
Ingo Molnara09785a2006-07-03 00:25:12 -0700619 lockdep_set_class(&sk->sk_receive_queue.lock,
620 &af_unix_sk_receive_queue_lock_key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 sk->sk_write_space = unix_write_space;
623 sk->sk_max_ack_backlog = sysctl_unix_max_dgram_qlen;
624 sk->sk_destruct = unix_sock_destructor;
625 u = unix_sk(sk);
626 u->dentry = NULL;
627 u->mnt = NULL;
Benjamin LaHaisefd19f322006-01-03 14:10:46 -0800628 spin_lock_init(&u->lock);
Miklos Szeredi1fd05ba2007-07-11 14:22:39 -0700629 atomic_set(&u->inflight, 0);
630 INIT_LIST_HEAD(&u->link);
Ingo Molnar57b47a52006-03-20 22:35:41 -0800631 mutex_init(&u->readlock); /* single task reading lock */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 init_waitqueue_head(&u->peer_wait);
633 unix_insert_socket(unix_sockets_unbound, sk);
634out:
Pavel Emelyanov284b3272007-11-10 22:08:30 -0800635 if (sk == NULL)
636 atomic_dec(&unix_nr_socks);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 return sk;
638}
639
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700640static int unix_create(struct net *net, struct socket *sock, int protocol)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
642 if (protocol && protocol != PF_UNIX)
643 return -EPROTONOSUPPORT;
644
645 sock->state = SS_UNCONNECTED;
646
647 switch (sock->type) {
648 case SOCK_STREAM:
649 sock->ops = &unix_stream_ops;
650 break;
651 /*
652 * Believe it or not BSD has AF_UNIX, SOCK_RAW though
653 * nothing uses it.
654 */
655 case SOCK_RAW:
656 sock->type=SOCK_DGRAM;
657 case SOCK_DGRAM:
658 sock->ops = &unix_dgram_ops;
659 break;
660 case SOCK_SEQPACKET:
661 sock->ops = &unix_seqpacket_ops;
662 break;
663 default:
664 return -ESOCKTNOSUPPORT;
665 }
666
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700667 return unix_create1(net, sock) ? 0 : -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668}
669
670static int unix_release(struct socket *sock)
671{
672 struct sock *sk = sock->sk;
673
674 if (!sk)
675 return 0;
676
677 sock->sk = NULL;
678
679 return unix_release_sock (sk, 0);
680}
681
682static int unix_autobind(struct socket *sock)
683{
684 struct sock *sk = sock->sk;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800685 struct net *net = sk->sk_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 struct unix_sock *u = unix_sk(sk);
687 static u32 ordernum = 1;
688 struct unix_address * addr;
689 int err;
690
Ingo Molnar57b47a52006-03-20 22:35:41 -0800691 mutex_lock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692
693 err = 0;
694 if (u->addr)
695 goto out;
696
697 err = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700698 addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 if (!addr)
700 goto out;
701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 addr->name->sun_family = AF_UNIX;
703 atomic_set(&addr->refcnt, 1);
704
705retry:
706 addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short);
707 addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0));
708
David S. Millerfbe9cc42005-12-13 23:26:29 -0800709 spin_lock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 ordernum = (ordernum+1)&0xFFFFF;
711
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800712 if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 addr->hash)) {
David S. Millerfbe9cc42005-12-13 23:26:29 -0800714 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 /* Sanity yield. It is unusual case, but yet... */
716 if (!(ordernum&0xFF))
717 yield();
718 goto retry;
719 }
720 addr->hash ^= sk->sk_type;
721
722 __unix_remove_socket(sk);
723 u->addr = addr;
724 __unix_insert_socket(&unix_socket_table[addr->hash], sk);
David S. Millerfbe9cc42005-12-13 23:26:29 -0800725 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 err = 0;
727
Ingo Molnar57b47a52006-03-20 22:35:41 -0800728out: mutex_unlock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 return err;
730}
731
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800732static struct sock *unix_find_other(struct net *net,
733 struct sockaddr_un *sunname, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 int type, unsigned hash, int *error)
735{
736 struct sock *u;
737 struct nameidata nd;
738 int err = 0;
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +0900739
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 if (sunname->sun_path[0]) {
741 err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd);
742 if (err)
743 goto fail;
Christoph Hellwige4543ed2005-11-08 21:35:04 -0800744 err = vfs_permission(&nd, MAY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 if (err)
746 goto put_fail;
747
748 err = -ECONNREFUSED;
749 if (!S_ISSOCK(nd.dentry->d_inode->i_mode))
750 goto put_fail;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800751 u=unix_find_socket_byinode(net, nd.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 if (!u)
753 goto put_fail;
754
755 if (u->sk_type == type)
756 touch_atime(nd.mnt, nd.dentry);
757
758 path_release(&nd);
759
760 err=-EPROTOTYPE;
761 if (u->sk_type != type) {
762 sock_put(u);
763 goto fail;
764 }
765 } else {
766 err = -ECONNREFUSED;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800767 u=unix_find_socket_byname(net, sunname, len, type, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 if (u) {
769 struct dentry *dentry;
770 dentry = unix_sk(u)->dentry;
771 if (dentry)
772 touch_atime(unix_sk(u)->mnt, dentry);
773 } else
774 goto fail;
775 }
776 return u;
777
778put_fail:
779 path_release(&nd);
780fail:
781 *error=err;
782 return NULL;
783}
784
785
786static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
787{
788 struct sock *sk = sock->sk;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800789 struct net *net = sk->sk_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 struct unix_sock *u = unix_sk(sk);
791 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
792 struct dentry * dentry = NULL;
793 struct nameidata nd;
794 int err;
795 unsigned hash;
796 struct unix_address *addr;
797 struct hlist_head *list;
798
799 err = -EINVAL;
800 if (sunaddr->sun_family != AF_UNIX)
801 goto out;
802
803 if (addr_len==sizeof(short)) {
804 err = unix_autobind(sock);
805 goto out;
806 }
807
808 err = unix_mkname(sunaddr, addr_len, &hash);
809 if (err < 0)
810 goto out;
811 addr_len = err;
812
Ingo Molnar57b47a52006-03-20 22:35:41 -0800813 mutex_lock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
815 err = -EINVAL;
816 if (u->addr)
817 goto out_up;
818
819 err = -ENOMEM;
820 addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL);
821 if (!addr)
822 goto out_up;
823
824 memcpy(addr->name, sunaddr, addr_len);
825 addr->len = addr_len;
826 addr->hash = hash ^ sk->sk_type;
827 atomic_set(&addr->refcnt, 1);
828
829 if (sunaddr->sun_path[0]) {
830 unsigned int mode;
831 err = 0;
832 /*
833 * Get the parent directory, calculate the hash for last
834 * component.
835 */
836 err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd);
837 if (err)
838 goto out_mknod_parent;
Christoph Hellwigf81a0bf2005-05-19 12:26:43 -0700839
840 dentry = lookup_create(&nd, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 err = PTR_ERR(dentry);
842 if (IS_ERR(dentry))
843 goto out_mknod_unlock;
Christoph Hellwigf81a0bf2005-05-19 12:26:43 -0700844
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 /*
846 * All right, let's create it.
847 */
848 mode = S_IFSOCK |
849 (SOCK_INODE(sock)->i_mode & ~current->fs->umask);
850 err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0);
851 if (err)
852 goto out_mknod_dput;
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800853 mutex_unlock(&nd.dentry->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 dput(nd.dentry);
855 nd.dentry = dentry;
856
857 addr->hash = UNIX_HASH_SIZE;
858 }
859
David S. Millerfbe9cc42005-12-13 23:26:29 -0800860 spin_lock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 if (!sunaddr->sun_path[0]) {
863 err = -EADDRINUSE;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800864 if (__unix_find_socket_byname(net, sunaddr, addr_len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 sk->sk_type, hash)) {
866 unix_release_addr(addr);
867 goto out_unlock;
868 }
869
870 list = &unix_socket_table[addr->hash];
871 } else {
872 list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)];
873 u->dentry = nd.dentry;
874 u->mnt = nd.mnt;
875 }
876
877 err = 0;
878 __unix_remove_socket(sk);
879 u->addr = addr;
880 __unix_insert_socket(list, sk);
881
882out_unlock:
David S. Millerfbe9cc42005-12-13 23:26:29 -0800883 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884out_up:
Ingo Molnar57b47a52006-03-20 22:35:41 -0800885 mutex_unlock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886out:
887 return err;
888
889out_mknod_dput:
890 dput(dentry);
891out_mknod_unlock:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800892 mutex_unlock(&nd.dentry->d_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 path_release(&nd);
894out_mknod_parent:
895 if (err==-EEXIST)
896 err=-EADDRINUSE;
897 unix_release_addr(addr);
898 goto out_up;
899}
900
David S. Miller278a3de2007-05-31 15:19:20 -0700901static void unix_state_double_lock(struct sock *sk1, struct sock *sk2)
902{
903 if (unlikely(sk1 == sk2) || !sk2) {
904 unix_state_lock(sk1);
905 return;
906 }
907 if (sk1 < sk2) {
908 unix_state_lock(sk1);
909 unix_state_lock_nested(sk2);
910 } else {
911 unix_state_lock(sk2);
912 unix_state_lock_nested(sk1);
913 }
914}
915
916static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2)
917{
918 if (unlikely(sk1 == sk2) || !sk2) {
919 unix_state_unlock(sk1);
920 return;
921 }
922 unix_state_unlock(sk1);
923 unix_state_unlock(sk2);
924}
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr,
927 int alen, int flags)
928{
929 struct sock *sk = sock->sk;
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800930 struct net *net = sk->sk_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr;
932 struct sock *other;
933 unsigned hash;
934 int err;
935
936 if (addr->sa_family != AF_UNSPEC) {
937 err = unix_mkname(sunaddr, alen, &hash);
938 if (err < 0)
939 goto out;
940 alen = err;
941
942 if (test_bit(SOCK_PASSCRED, &sock->flags) &&
943 !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0)
944 goto out;
945
David S. Miller278a3de2007-05-31 15:19:20 -0700946restart:
Denis V. Lunev097e66c2007-11-19 22:29:30 -0800947 other=unix_find_other(net, sunaddr, alen, sock->type, hash, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 if (!other)
949 goto out;
950
David S. Miller278a3de2007-05-31 15:19:20 -0700951 unix_state_double_lock(sk, other);
952
953 /* Apparently VFS overslept socket death. Retry. */
954 if (sock_flag(other, SOCK_DEAD)) {
955 unix_state_double_unlock(sk, other);
956 sock_put(other);
957 goto restart;
958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
960 err = -EPERM;
961 if (!unix_may_send(sk, other))
962 goto out_unlock;
963
964 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
965 if (err)
966 goto out_unlock;
967
968 } else {
969 /*
970 * 1003.1g breaking connected state with AF_UNSPEC
971 */
972 other = NULL;
David S. Miller278a3de2007-05-31 15:19:20 -0700973 unix_state_double_lock(sk, other);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
975
976 /*
977 * If it was connected, reconnect.
978 */
979 if (unix_peer(sk)) {
980 struct sock *old_peer = unix_peer(sk);
981 unix_peer(sk)=other;
David S. Miller278a3de2007-05-31 15:19:20 -0700982 unix_state_double_unlock(sk, other);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
984 if (other != old_peer)
985 unix_dgram_disconnected(sk, old_peer);
986 sock_put(old_peer);
987 } else {
988 unix_peer(sk)=other;
David S. Miller278a3de2007-05-31 15:19:20 -0700989 unix_state_double_unlock(sk, other);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 }
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +0900991 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993out_unlock:
David S. Miller278a3de2007-05-31 15:19:20 -0700994 unix_state_double_unlock(sk, other);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 sock_put(other);
996out:
997 return err;
998}
999
1000static long unix_wait_for_peer(struct sock *other, long timeo)
1001{
1002 struct unix_sock *u = unix_sk(other);
1003 int sched;
1004 DEFINE_WAIT(wait);
1005
1006 prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE);
1007
1008 sched = !sock_flag(other, SOCK_DEAD) &&
1009 !(other->sk_shutdown & RCV_SHUTDOWN) &&
David S. Miller64a14652007-03-06 11:21:05 -08001010 (skb_queue_len(&other->sk_receive_queue) >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 other->sk_max_ack_backlog);
1012
David S. Miller1c92b4e2007-05-31 13:24:26 -07001013 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
1015 if (sched)
1016 timeo = schedule_timeout(timeo);
1017
1018 finish_wait(&u->peer_wait, &wait);
1019 return timeo;
1020}
1021
1022static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr,
1023 int addr_len, int flags)
1024{
1025 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
1026 struct sock *sk = sock->sk;
Denis V. Lunev097e66c2007-11-19 22:29:30 -08001027 struct net *net = sk->sk_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 struct unix_sock *u = unix_sk(sk), *newu, *otheru;
1029 struct sock *newsk = NULL;
1030 struct sock *other = NULL;
1031 struct sk_buff *skb = NULL;
1032 unsigned hash;
1033 int st;
1034 int err;
1035 long timeo;
1036
1037 err = unix_mkname(sunaddr, addr_len, &hash);
1038 if (err < 0)
1039 goto out;
1040 addr_len = err;
1041
1042 if (test_bit(SOCK_PASSCRED, &sock->flags)
1043 && !u->addr && (err = unix_autobind(sock)) != 0)
1044 goto out;
1045
1046 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
1047
1048 /* First of all allocate resources.
1049 If we will make it after state is locked,
1050 we will have to recheck all again in any case.
1051 */
1052
1053 err = -ENOMEM;
1054
1055 /* create new sock for complete connection */
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001056 newsk = unix_create1(sk->sk_net, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 if (newsk == NULL)
1058 goto out;
1059
1060 /* Allocate skb for sending to listening sock */
1061 skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL);
1062 if (skb == NULL)
1063 goto out;
1064
1065restart:
1066 /* Find listening sock. */
Denis V. Lunev097e66c2007-11-19 22:29:30 -08001067 other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (!other)
1069 goto out;
1070
1071 /* Latch state of peer */
David S. Miller1c92b4e2007-05-31 13:24:26 -07001072 unix_state_lock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
1074 /* Apparently VFS overslept socket death. Retry. */
1075 if (sock_flag(other, SOCK_DEAD)) {
David S. Miller1c92b4e2007-05-31 13:24:26 -07001076 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 sock_put(other);
1078 goto restart;
1079 }
1080
1081 err = -ECONNREFUSED;
1082 if (other->sk_state != TCP_LISTEN)
1083 goto out_unlock;
1084
David S. Miller64a14652007-03-06 11:21:05 -08001085 if (skb_queue_len(&other->sk_receive_queue) >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 other->sk_max_ack_backlog) {
1087 err = -EAGAIN;
1088 if (!timeo)
1089 goto out_unlock;
1090
1091 timeo = unix_wait_for_peer(other, timeo);
1092
1093 err = sock_intr_errno(timeo);
1094 if (signal_pending(current))
1095 goto out;
1096 sock_put(other);
1097 goto restart;
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001098 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099
1100 /* Latch our state.
1101
1102 It is tricky place. We need to grab write lock and cannot
1103 drop lock on peer. It is dangerous because deadlock is
1104 possible. Connect to self case and simultaneous
1105 attempt to connect are eliminated by checking socket
1106 state. other is TCP_LISTEN, if sk is TCP_LISTEN we
1107 check this before attempt to grab lock.
1108
1109 Well, and we have to recheck the state after socket locked.
1110 */
1111 st = sk->sk_state;
1112
1113 switch (st) {
1114 case TCP_CLOSE:
1115 /* This is ok... continue with connect */
1116 break;
1117 case TCP_ESTABLISHED:
1118 /* Socket is already connected */
1119 err = -EISCONN;
1120 goto out_unlock;
1121 default:
1122 err = -EINVAL;
1123 goto out_unlock;
1124 }
1125
David S. Miller1c92b4e2007-05-31 13:24:26 -07001126 unix_state_lock_nested(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
1128 if (sk->sk_state != st) {
David S. Miller1c92b4e2007-05-31 13:24:26 -07001129 unix_state_unlock(sk);
1130 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 sock_put(other);
1132 goto restart;
1133 }
1134
1135 err = security_unix_stream_connect(sock, other->sk_socket, newsk);
1136 if (err) {
David S. Miller1c92b4e2007-05-31 13:24:26 -07001137 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 goto out_unlock;
1139 }
1140
1141 /* The way is open! Fastly set all the necessary fields... */
1142
1143 sock_hold(sk);
1144 unix_peer(newsk) = sk;
1145 newsk->sk_state = TCP_ESTABLISHED;
1146 newsk->sk_type = sk->sk_type;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001147 newsk->sk_peercred.pid = task_tgid_vnr(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 newsk->sk_peercred.uid = current->euid;
1149 newsk->sk_peercred.gid = current->egid;
1150 newu = unix_sk(newsk);
1151 newsk->sk_sleep = &newu->peer_wait;
1152 otheru = unix_sk(other);
1153
1154 /* copy address information from listening to new sock*/
1155 if (otheru->addr) {
1156 atomic_inc(&otheru->addr->refcnt);
1157 newu->addr = otheru->addr;
1158 }
1159 if (otheru->dentry) {
1160 newu->dentry = dget(otheru->dentry);
1161 newu->mnt = mntget(otheru->mnt);
1162 }
1163
1164 /* Set credentials */
1165 sk->sk_peercred = other->sk_peercred;
1166
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 sock->state = SS_CONNECTED;
1168 sk->sk_state = TCP_ESTABLISHED;
Benjamin LaHaise830a1e52005-12-13 23:22:32 -08001169 sock_hold(newsk);
1170
1171 smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */
1172 unix_peer(sk) = newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
David S. Miller1c92b4e2007-05-31 13:24:26 -07001174 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
1176 /* take ten and and send info to listening sock */
1177 spin_lock(&other->sk_receive_queue.lock);
1178 __skb_queue_tail(&other->sk_receive_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 spin_unlock(&other->sk_receive_queue.lock);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001180 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 other->sk_data_ready(other, 0);
1182 sock_put(other);
1183 return 0;
1184
1185out_unlock:
1186 if (other)
David S. Miller1c92b4e2007-05-31 13:24:26 -07001187 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
1189out:
1190 if (skb)
1191 kfree_skb(skb);
1192 if (newsk)
1193 unix_release_sock(newsk, 0);
1194 if (other)
1195 sock_put(other);
1196 return err;
1197}
1198
1199static int unix_socketpair(struct socket *socka, struct socket *sockb)
1200{
1201 struct sock *ska=socka->sk, *skb = sockb->sk;
1202
1203 /* Join our sockets back to back */
1204 sock_hold(ska);
1205 sock_hold(skb);
1206 unix_peer(ska)=skb;
1207 unix_peer(skb)=ska;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001208 ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid;
1210 ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid;
1211
1212 if (ska->sk_type != SOCK_DGRAM) {
1213 ska->sk_state = TCP_ESTABLISHED;
1214 skb->sk_state = TCP_ESTABLISHED;
1215 socka->state = SS_CONNECTED;
1216 sockb->state = SS_CONNECTED;
1217 }
1218 return 0;
1219}
1220
1221static int unix_accept(struct socket *sock, struct socket *newsock, int flags)
1222{
1223 struct sock *sk = sock->sk;
1224 struct sock *tsk;
1225 struct sk_buff *skb;
1226 int err;
1227
1228 err = -EOPNOTSUPP;
1229 if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET)
1230 goto out;
1231
1232 err = -EINVAL;
1233 if (sk->sk_state != TCP_LISTEN)
1234 goto out;
1235
1236 /* If socket state is TCP_LISTEN it cannot change (for now...),
1237 * so that no locks are necessary.
1238 */
1239
1240 skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err);
1241 if (!skb) {
1242 /* This means receive shutdown. */
1243 if (err == 0)
1244 err = -EINVAL;
1245 goto out;
1246 }
1247
1248 tsk = skb->sk;
1249 skb_free_datagram(sk, skb);
1250 wake_up_interruptible(&unix_sk(sk)->peer_wait);
1251
1252 /* attach accepted sock to socket */
David S. Miller1c92b4e2007-05-31 13:24:26 -07001253 unix_state_lock(tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 newsock->state = SS_CONNECTED;
1255 sock_graft(tsk, newsock);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001256 unix_state_unlock(tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 return 0;
1258
1259out:
1260 return err;
1261}
1262
1263
1264static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer)
1265{
1266 struct sock *sk = sock->sk;
1267 struct unix_sock *u;
1268 struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr;
1269 int err = 0;
1270
1271 if (peer) {
1272 sk = unix_peer_get(sk);
1273
1274 err = -ENOTCONN;
1275 if (!sk)
1276 goto out;
1277 err = 0;
1278 } else {
1279 sock_hold(sk);
1280 }
1281
1282 u = unix_sk(sk);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001283 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 if (!u->addr) {
1285 sunaddr->sun_family = AF_UNIX;
1286 sunaddr->sun_path[0] = 0;
1287 *uaddr_len = sizeof(short);
1288 } else {
1289 struct unix_address *addr = u->addr;
1290
1291 *uaddr_len = addr->len;
1292 memcpy(sunaddr, addr->name, *uaddr_len);
1293 }
David S. Miller1c92b4e2007-05-31 13:24:26 -07001294 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 sock_put(sk);
1296out:
1297 return err;
1298}
1299
1300static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1301{
1302 int i;
1303
1304 scm->fp = UNIXCB(skb).fp;
1305 skb->destructor = sock_wfree;
1306 UNIXCB(skb).fp = NULL;
1307
1308 for (i=scm->fp->count-1; i>=0; i--)
1309 unix_notinflight(scm->fp->fp[i]);
1310}
1311
1312static void unix_destruct_fds(struct sk_buff *skb)
1313{
1314 struct scm_cookie scm;
1315 memset(&scm, 0, sizeof(scm));
1316 unix_detach_fds(&scm, skb);
1317
1318 /* Alas, it calls VFS */
1319 /* So fscking what? fput() had been SMP-safe since the last Summer */
1320 scm_destroy(&scm);
1321 sock_wfree(skb);
1322}
1323
1324static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
1325{
1326 int i;
1327 for (i=scm->fp->count-1; i>=0; i--)
1328 unix_inflight(scm->fp->fp[i]);
1329 UNIXCB(skb).fp = scm->fp;
1330 skb->destructor = unix_destruct_fds;
1331 scm->fp = NULL;
1332}
1333
1334/*
1335 * Send AF_UNIX data.
1336 */
1337
1338static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
1339 struct msghdr *msg, size_t len)
1340{
1341 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1342 struct sock *sk = sock->sk;
Denis V. Lunev097e66c2007-11-19 22:29:30 -08001343 struct net *net = sk->sk_net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 struct unix_sock *u = unix_sk(sk);
1345 struct sockaddr_un *sunaddr=msg->msg_name;
1346 struct sock *other = NULL;
1347 int namelen = 0; /* fake GCC */
1348 int err;
1349 unsigned hash;
1350 struct sk_buff *skb;
1351 long timeo;
1352 struct scm_cookie tmp_scm;
1353
1354 if (NULL == siocb->scm)
1355 siocb->scm = &tmp_scm;
1356 err = scm_send(sock, msg, siocb->scm);
1357 if (err < 0)
1358 return err;
1359
1360 err = -EOPNOTSUPP;
1361 if (msg->msg_flags&MSG_OOB)
1362 goto out;
1363
1364 if (msg->msg_namelen) {
1365 err = unix_mkname(sunaddr, msg->msg_namelen, &hash);
1366 if (err < 0)
1367 goto out;
1368 namelen = err;
1369 } else {
1370 sunaddr = NULL;
1371 err = -ENOTCONN;
1372 other = unix_peer_get(sk);
1373 if (!other)
1374 goto out;
1375 }
1376
1377 if (test_bit(SOCK_PASSCRED, &sock->flags)
1378 && !u->addr && (err = unix_autobind(sock)) != 0)
1379 goto out;
1380
1381 err = -EMSGSIZE;
1382 if (len > sk->sk_sndbuf - 32)
1383 goto out;
1384
1385 skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err);
1386 if (skb==NULL)
1387 goto out;
1388
1389 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1390 if (siocb->scm->fp)
1391 unix_attach_fds(siocb->scm, skb);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07001392 unix_get_secdata(siocb->scm, skb);
Catherine Zhang877ce7c2006-06-29 12:27:47 -07001393
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -03001394 skb_reset_transport_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
1396 if (err)
1397 goto out_free;
1398
1399 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
1400
1401restart:
1402 if (!other) {
1403 err = -ECONNRESET;
1404 if (sunaddr == NULL)
1405 goto out_free;
1406
Denis V. Lunev097e66c2007-11-19 22:29:30 -08001407 other = unix_find_other(net, sunaddr, namelen, sk->sk_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 hash, &err);
1409 if (other==NULL)
1410 goto out_free;
1411 }
1412
David S. Miller1c92b4e2007-05-31 13:24:26 -07001413 unix_state_lock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 err = -EPERM;
1415 if (!unix_may_send(sk, other))
1416 goto out_unlock;
1417
1418 if (sock_flag(other, SOCK_DEAD)) {
1419 /*
1420 * Check with 1003.1g - what should
1421 * datagram error
1422 */
David S. Miller1c92b4e2007-05-31 13:24:26 -07001423 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 sock_put(other);
1425
1426 err = 0;
David S. Miller1c92b4e2007-05-31 13:24:26 -07001427 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 if (unix_peer(sk) == other) {
1429 unix_peer(sk)=NULL;
David S. Miller1c92b4e2007-05-31 13:24:26 -07001430 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431
1432 unix_dgram_disconnected(sk, other);
1433 sock_put(other);
1434 err = -ECONNREFUSED;
1435 } else {
David S. Miller1c92b4e2007-05-31 13:24:26 -07001436 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 }
1438
1439 other = NULL;
1440 if (err)
1441 goto out_free;
1442 goto restart;
1443 }
1444
1445 err = -EPIPE;
1446 if (other->sk_shutdown & RCV_SHUTDOWN)
1447 goto out_unlock;
1448
1449 if (sk->sk_type != SOCK_SEQPACKET) {
1450 err = security_unix_may_send(sk->sk_socket, other->sk_socket);
1451 if (err)
1452 goto out_unlock;
1453 }
1454
1455 if (unix_peer(other) != sk &&
David S. Miller64a14652007-03-06 11:21:05 -08001456 (skb_queue_len(&other->sk_receive_queue) >
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 other->sk_max_ack_backlog)) {
1458 if (!timeo) {
1459 err = -EAGAIN;
1460 goto out_unlock;
1461 }
1462
1463 timeo = unix_wait_for_peer(other, timeo);
1464
1465 err = sock_intr_errno(timeo);
1466 if (signal_pending(current))
1467 goto out_free;
1468
1469 goto restart;
1470 }
1471
1472 skb_queue_tail(&other->sk_receive_queue, skb);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001473 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 other->sk_data_ready(other, len);
1475 sock_put(other);
1476 scm_destroy(siocb->scm);
1477 return len;
1478
1479out_unlock:
David S. Miller1c92b4e2007-05-31 13:24:26 -07001480 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481out_free:
1482 kfree_skb(skb);
1483out:
1484 if (other)
1485 sock_put(other);
1486 scm_destroy(siocb->scm);
1487 return err;
1488}
1489
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001490
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
1492 struct msghdr *msg, size_t len)
1493{
1494 struct sock_iocb *siocb = kiocb_to_siocb(kiocb);
1495 struct sock *sk = sock->sk;
1496 struct sock *other = NULL;
1497 struct sockaddr_un *sunaddr=msg->msg_name;
1498 int err,size;
1499 struct sk_buff *skb;
1500 int sent=0;
1501 struct scm_cookie tmp_scm;
1502
1503 if (NULL == siocb->scm)
1504 siocb->scm = &tmp_scm;
1505 err = scm_send(sock, msg, siocb->scm);
1506 if (err < 0)
1507 return err;
1508
1509 err = -EOPNOTSUPP;
1510 if (msg->msg_flags&MSG_OOB)
1511 goto out_err;
1512
1513 if (msg->msg_namelen) {
1514 err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP;
1515 goto out_err;
1516 } else {
1517 sunaddr = NULL;
1518 err = -ENOTCONN;
Benjamin LaHaise830a1e52005-12-13 23:22:32 -08001519 other = unix_peer(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 if (!other)
1521 goto out_err;
1522 }
1523
1524 if (sk->sk_shutdown & SEND_SHUTDOWN)
1525 goto pipe_err;
1526
1527 while(sent < len)
1528 {
1529 /*
Benjamin LaHaisee9df7d7f2006-03-20 21:29:05 -08001530 * Optimisation for the fact that under 0.01% of X
1531 * messages typically need breaking up.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 */
1533
Benjamin LaHaisee9df7d7f2006-03-20 21:29:05 -08001534 size = len-sent;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535
1536 /* Keep two messages in the pipe so it schedules better */
Benjamin LaHaisee9df7d7f2006-03-20 21:29:05 -08001537 if (size > ((sk->sk_sndbuf >> 1) - 64))
1538 size = (sk->sk_sndbuf >> 1) - 64;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
1540 if (size > SKB_MAX_ALLOC)
1541 size = SKB_MAX_ALLOC;
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001542
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 /*
1544 * Grab a buffer
1545 */
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err);
1548
1549 if (skb==NULL)
1550 goto out_err;
1551
1552 /*
1553 * If you pass two values to the sock_alloc_send_skb
1554 * it tries to grab the large buffer with GFP_NOFS
1555 * (which can fail easily), and if it fails grab the
1556 * fallback size buffer which is under a page and will
1557 * succeed. [Alan]
1558 */
1559 size = min_t(int, size, skb_tailroom(skb));
1560
1561 memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred));
1562 if (siocb->scm->fp)
1563 unix_attach_fds(siocb->scm, skb);
1564
1565 if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) {
1566 kfree_skb(skb);
1567 goto out_err;
1568 }
1569
David S. Miller1c92b4e2007-05-31 13:24:26 -07001570 unix_state_lock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571
1572 if (sock_flag(other, SOCK_DEAD) ||
1573 (other->sk_shutdown & RCV_SHUTDOWN))
1574 goto pipe_err_free;
1575
1576 skb_queue_tail(&other->sk_receive_queue, skb);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001577 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 other->sk_data_ready(other, size);
1579 sent+=size;
1580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
1582 scm_destroy(siocb->scm);
1583 siocb->scm = NULL;
1584
1585 return sent;
1586
1587pipe_err_free:
David S. Miller1c92b4e2007-05-31 13:24:26 -07001588 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589 kfree_skb(skb);
1590pipe_err:
1591 if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL))
1592 send_sig(SIGPIPE,current,0);
1593 err = -EPIPE;
1594out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 scm_destroy(siocb->scm);
1596 siocb->scm = NULL;
1597 return sent ? : err;
1598}
1599
1600static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock,
1601 struct msghdr *msg, size_t len)
1602{
1603 int err;
1604 struct sock *sk = sock->sk;
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001605
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 err = sock_error(sk);
1607 if (err)
1608 return err;
1609
1610 if (sk->sk_state != TCP_ESTABLISHED)
1611 return -ENOTCONN;
1612
1613 if (msg->msg_namelen)
1614 msg->msg_namelen = 0;
1615
1616 return unix_dgram_sendmsg(kiocb, sock, msg, len);
1617}
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001618
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619static void unix_copy_addr(struct msghdr *msg, struct sock *sk)
1620{
1621 struct unix_sock *u = unix_sk(sk);
1622
1623 msg->msg_namelen = 0;
1624 if (u->addr) {
1625 msg->msg_namelen = u->addr->len;
1626 memcpy(msg->msg_name, u->addr->name, u->addr->len);
1627 }
1628}
1629
1630static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
1631 struct msghdr *msg, size_t size,
1632 int flags)
1633{
1634 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1635 struct scm_cookie tmp_scm;
1636 struct sock *sk = sock->sk;
1637 struct unix_sock *u = unix_sk(sk);
1638 int noblock = flags & MSG_DONTWAIT;
1639 struct sk_buff *skb;
1640 int err;
1641
1642 err = -EOPNOTSUPP;
1643 if (flags&MSG_OOB)
1644 goto out;
1645
1646 msg->msg_namelen = 0;
1647
Ingo Molnar57b47a52006-03-20 22:35:41 -08001648 mutex_lock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649
1650 skb = skb_recv_datagram(sk, flags, noblock, &err);
Florian Zumbiehl0a112252007-11-29 23:19:23 +11001651 if (!skb) {
1652 unix_state_lock(sk);
1653 /* Signal EOF on disconnected non-blocking SEQPACKET socket. */
1654 if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN &&
1655 (sk->sk_shutdown & RCV_SHUTDOWN))
1656 err = 0;
1657 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 goto out_unlock;
Florian Zumbiehl0a112252007-11-29 23:19:23 +11001659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660
Ingo Molnar71e20f12007-10-15 17:00:19 +02001661 wake_up_interruptible_sync(&u->peer_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001662
1663 if (msg->msg_name)
1664 unix_copy_addr(msg, skb->sk);
1665
1666 if (size > skb->len)
1667 size = skb->len;
1668 else if (size < skb->len)
1669 msg->msg_flags |= MSG_TRUNC;
1670
1671 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size);
1672 if (err)
1673 goto out_free;
1674
1675 if (!siocb->scm) {
1676 siocb->scm = &tmp_scm;
1677 memset(&tmp_scm, 0, sizeof(tmp_scm));
1678 }
1679 siocb->scm->creds = *UNIXCREDS(skb);
Catherine Zhang877ce7c2006-06-29 12:27:47 -07001680 unix_set_secdata(siocb->scm, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681
1682 if (!(flags & MSG_PEEK))
1683 {
1684 if (UNIXCB(skb).fp)
1685 unix_detach_fds(siocb->scm, skb);
1686 }
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001687 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688 {
1689 /* It is questionable: on PEEK we could:
1690 - do not return fds - good, but too simple 8)
1691 - return fds, and do not return them on read (old strategy,
1692 apparently wrong)
1693 - clone fds (I chose it for now, it is the most universal
1694 solution)
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001695
1696 POSIX 1003.1g does not actually define this clearly
1697 at all. POSIX 1003.1g doesn't define a lot of things
1698 clearly however!
1699
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 */
1701 if (UNIXCB(skb).fp)
1702 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1703 }
1704 err = size;
1705
1706 scm_recv(sock, msg, siocb->scm, flags);
1707
1708out_free:
1709 skb_free_datagram(sk,skb);
1710out_unlock:
Ingo Molnar57b47a52006-03-20 22:35:41 -08001711 mutex_unlock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712out:
1713 return err;
1714}
1715
1716/*
1717 * Sleep until data has arrive. But check for races..
1718 */
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001719
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720static long unix_stream_data_wait(struct sock * sk, long timeo)
1721{
1722 DEFINE_WAIT(wait);
1723
David S. Miller1c92b4e2007-05-31 13:24:26 -07001724 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725
1726 for (;;) {
1727 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
1728
David S. Millerb03efcf2005-07-08 14:57:23 -07001729 if (!skb_queue_empty(&sk->sk_receive_queue) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001730 sk->sk_err ||
1731 (sk->sk_shutdown & RCV_SHUTDOWN) ||
1732 signal_pending(current) ||
1733 !timeo)
1734 break;
1735
1736 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001737 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738 timeo = schedule_timeout(timeo);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001739 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
1741 }
1742
1743 finish_wait(sk->sk_sleep, &wait);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001744 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 return timeo;
1746}
1747
1748
1749
1750static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
1751 struct msghdr *msg, size_t size,
1752 int flags)
1753{
1754 struct sock_iocb *siocb = kiocb_to_siocb(iocb);
1755 struct scm_cookie tmp_scm;
1756 struct sock *sk = sock->sk;
1757 struct unix_sock *u = unix_sk(sk);
1758 struct sockaddr_un *sunaddr=msg->msg_name;
1759 int copied = 0;
1760 int check_creds = 0;
1761 int target;
1762 int err = 0;
1763 long timeo;
1764
1765 err = -EINVAL;
1766 if (sk->sk_state != TCP_ESTABLISHED)
1767 goto out;
1768
1769 err = -EOPNOTSUPP;
1770 if (flags&MSG_OOB)
1771 goto out;
1772
1773 target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
1774 timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
1775
1776 msg->msg_namelen = 0;
1777
1778 /* Lock the socket to prevent queue disordering
1779 * while sleeps in memcpy_tomsg
1780 */
1781
1782 if (!siocb->scm) {
1783 siocb->scm = &tmp_scm;
1784 memset(&tmp_scm, 0, sizeof(tmp_scm));
1785 }
1786
Ingo Molnar57b47a52006-03-20 22:35:41 -08001787 mutex_lock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001788
1789 do
1790 {
1791 int chunk;
1792 struct sk_buff *skb;
1793
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001794 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 skb = skb_dequeue(&sk->sk_receive_queue);
1796 if (skb==NULL)
1797 {
1798 if (copied >= target)
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001799 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800
1801 /*
1802 * POSIX 1003.1g mandates this order.
1803 */
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09001804
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 if ((err = sock_error(sk)) != 0)
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001806 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 if (sk->sk_shutdown & RCV_SHUTDOWN)
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001808 goto unlock;
1809
1810 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 err = -EAGAIN;
1812 if (!timeo)
1813 break;
Ingo Molnar57b47a52006-03-20 22:35:41 -08001814 mutex_unlock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001815
1816 timeo = unix_stream_data_wait(sk, timeo);
1817
1818 if (signal_pending(current)) {
1819 err = sock_intr_errno(timeo);
1820 goto out;
1821 }
Ingo Molnar57b47a52006-03-20 22:35:41 -08001822 mutex_lock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 continue;
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001824 unlock:
1825 unix_state_unlock(sk);
1826 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 }
Miklos Szeredi3c0d2f32007-06-05 13:10:29 -07001828 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829
1830 if (check_creds) {
1831 /* Never glue messages from different writers */
1832 if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) {
1833 skb_queue_head(&sk->sk_receive_queue, skb);
1834 break;
1835 }
1836 } else {
1837 /* Copy credentials */
1838 siocb->scm->creds = *UNIXCREDS(skb);
1839 check_creds = 1;
1840 }
1841
1842 /* Copy address just once */
1843 if (sunaddr)
1844 {
1845 unix_copy_addr(msg, skb->sk);
1846 sunaddr = NULL;
1847 }
1848
1849 chunk = min_t(unsigned int, skb->len, size);
1850 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
1851 skb_queue_head(&sk->sk_receive_queue, skb);
1852 if (copied == 0)
1853 copied = -EFAULT;
1854 break;
1855 }
1856 copied += chunk;
1857 size -= chunk;
1858
1859 /* Mark read part of skb as used */
1860 if (!(flags & MSG_PEEK))
1861 {
1862 skb_pull(skb, chunk);
1863
1864 if (UNIXCB(skb).fp)
1865 unix_detach_fds(siocb->scm, skb);
1866
1867 /* put the skb back if we didn't use it up.. */
1868 if (skb->len)
1869 {
1870 skb_queue_head(&sk->sk_receive_queue, skb);
1871 break;
1872 }
1873
1874 kfree_skb(skb);
1875
1876 if (siocb->scm->fp)
1877 break;
1878 }
1879 else
1880 {
1881 /* It is questionable, see note in unix_dgram_recvmsg.
1882 */
1883 if (UNIXCB(skb).fp)
1884 siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
1885
1886 /* put message back and return */
1887 skb_queue_head(&sk->sk_receive_queue, skb);
1888 break;
1889 }
1890 } while (size);
1891
Ingo Molnar57b47a52006-03-20 22:35:41 -08001892 mutex_unlock(&u->readlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 scm_recv(sock, msg, siocb->scm, flags);
1894out:
1895 return copied ? : err;
1896}
1897
1898static int unix_shutdown(struct socket *sock, int mode)
1899{
1900 struct sock *sk = sock->sk;
1901 struct sock *other;
1902
1903 mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN);
1904
1905 if (mode) {
David S. Miller1c92b4e2007-05-31 13:24:26 -07001906 unix_state_lock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 sk->sk_shutdown |= mode;
1908 other=unix_peer(sk);
1909 if (other)
1910 sock_hold(other);
David S. Miller1c92b4e2007-05-31 13:24:26 -07001911 unix_state_unlock(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 sk->sk_state_change(sk);
1913
1914 if (other &&
1915 (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) {
1916
1917 int peer_mode = 0;
1918
1919 if (mode&RCV_SHUTDOWN)
1920 peer_mode |= SEND_SHUTDOWN;
1921 if (mode&SEND_SHUTDOWN)
1922 peer_mode |= RCV_SHUTDOWN;
David S. Miller1c92b4e2007-05-31 13:24:26 -07001923 unix_state_lock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 other->sk_shutdown |= peer_mode;
David S. Miller1c92b4e2007-05-31 13:24:26 -07001925 unix_state_unlock(other);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926 other->sk_state_change(other);
1927 read_lock(&other->sk_callback_lock);
1928 if (peer_mode == SHUTDOWN_MASK)
1929 sk_wake_async(other,1,POLL_HUP);
1930 else if (peer_mode & RCV_SHUTDOWN)
1931 sk_wake_async(other,1,POLL_IN);
1932 read_unlock(&other->sk_callback_lock);
1933 }
1934 if (other)
1935 sock_put(other);
1936 }
1937 return 0;
1938}
1939
1940static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1941{
1942 struct sock *sk = sock->sk;
1943 long amount=0;
1944 int err;
1945
1946 switch(cmd)
1947 {
1948 case SIOCOUTQ:
1949 amount = atomic_read(&sk->sk_wmem_alloc);
1950 err = put_user(amount, (int __user *)arg);
1951 break;
1952 case SIOCINQ:
1953 {
1954 struct sk_buff *skb;
1955
1956 if (sk->sk_state == TCP_LISTEN) {
1957 err = -EINVAL;
1958 break;
1959 }
1960
1961 spin_lock(&sk->sk_receive_queue.lock);
1962 if (sk->sk_type == SOCK_STREAM ||
1963 sk->sk_type == SOCK_SEQPACKET) {
1964 skb_queue_walk(&sk->sk_receive_queue, skb)
1965 amount += skb->len;
1966 } else {
1967 skb = skb_peek(&sk->sk_receive_queue);
1968 if (skb)
1969 amount=skb->len;
1970 }
1971 spin_unlock(&sk->sk_receive_queue.lock);
1972 err = put_user(amount, (int __user *)arg);
1973 break;
1974 }
1975
1976 default:
Christoph Hellwigb5e5fa52006-01-03 14:18:33 -08001977 err = -ENOIOCTLCMD;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 break;
1979 }
1980 return err;
1981}
1982
1983static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait)
1984{
1985 struct sock *sk = sock->sk;
1986 unsigned int mask;
1987
1988 poll_wait(file, sk->sk_sleep, wait);
1989 mask = 0;
1990
1991 /* exceptional events? */
1992 if (sk->sk_err)
1993 mask |= POLLERR;
1994 if (sk->sk_shutdown == SHUTDOWN_MASK)
1995 mask |= POLLHUP;
Davide Libenzif348d702006-03-25 03:07:39 -08001996 if (sk->sk_shutdown & RCV_SHUTDOWN)
1997 mask |= POLLRDHUP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998
1999 /* readable? */
2000 if (!skb_queue_empty(&sk->sk_receive_queue) ||
2001 (sk->sk_shutdown & RCV_SHUTDOWN))
2002 mask |= POLLIN | POLLRDNORM;
2003
2004 /* Connection-based need to check for termination and startup */
2005 if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE)
2006 mask |= POLLHUP;
2007
2008 /*
2009 * we set writable also when the other side has shut down the
2010 * connection. This prevents stuck sockets.
2011 */
2012 if (unix_writable(sk))
2013 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
2014
2015 return mask;
2016}
2017
2018
2019#ifdef CONFIG_PROC_FS
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002020struct unix_iter_state {
Denis V. Luneve372c412007-11-19 22:31:54 -08002021 struct seq_net_private p;
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002022 int i;
2023};
2024static struct sock *unix_seq_idx(struct unix_iter_state *iter, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025{
2026 loff_t off = 0;
2027 struct sock *s;
2028
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002029 for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) {
Denis V. Luneve372c412007-11-19 22:31:54 -08002030 if (s->sk_net != iter->p.net)
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002031 continue;
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09002032 if (off == pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033 return s;
2034 ++off;
2035 }
2036 return NULL;
2037}
2038
2039
2040static void *unix_seq_start(struct seq_file *seq, loff_t *pos)
2041{
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002042 struct unix_iter_state *iter = seq->private;
David S. Millerfbe9cc42005-12-13 23:26:29 -08002043 spin_lock(&unix_table_lock);
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002044 return *pos ? unix_seq_idx(iter, *pos - 1) : ((void *) 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045}
2046
2047static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2048{
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002049 struct unix_iter_state *iter = seq->private;
2050 struct sock *sk = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 ++*pos;
2052
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09002053 if (v == (void *)1)
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002054 sk = first_unix_socket(&iter->i);
2055 else
2056 sk = next_unix_socket(&iter->i, sk);
Denis V. Luneve372c412007-11-19 22:31:54 -08002057 while (sk && (sk->sk_net != iter->p.net))
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002058 sk = next_unix_socket(&iter->i, sk);
2059 return sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060}
2061
2062static void unix_seq_stop(struct seq_file *seq, void *v)
2063{
David S. Millerfbe9cc42005-12-13 23:26:29 -08002064 spin_unlock(&unix_table_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065}
2066
2067static int unix_seq_show(struct seq_file *seq, void *v)
2068{
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09002069
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 if (v == (void *)1)
2071 seq_puts(seq, "Num RefCount Protocol Flags Type St "
2072 "Inode Path\n");
2073 else {
2074 struct sock *s = v;
2075 struct unix_sock *u = unix_sk(s);
David S. Miller1c92b4e2007-05-31 13:24:26 -07002076 unix_state_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077
2078 seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu",
2079 s,
2080 atomic_read(&s->sk_refcnt),
2081 0,
2082 s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0,
2083 s->sk_type,
2084 s->sk_socket ?
2085 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) :
2086 (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING),
2087 sock_i_ino(s));
2088
2089 if (u->addr) {
2090 int i, len;
2091 seq_putc(seq, ' ');
2092
2093 i = 0;
2094 len = u->addr->len - sizeof(short);
2095 if (!UNIX_ABSTRACT(s))
2096 len--;
2097 else {
2098 seq_putc(seq, '@');
2099 i++;
2100 }
2101 for ( ; i < len; i++)
2102 seq_putc(seq, u->addr->name->sun_path[i]);
2103 }
David S. Miller1c92b4e2007-05-31 13:24:26 -07002104 unix_state_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 seq_putc(seq, '\n');
2106 }
2107
2108 return 0;
2109}
2110
Philippe De Muyter56b3d972007-07-10 23:07:31 -07002111static const struct seq_operations unix_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002112 .start = unix_seq_start,
2113 .next = unix_seq_next,
2114 .stop = unix_seq_stop,
2115 .show = unix_seq_show,
2116};
2117
2118
2119static int unix_seq_open(struct inode *inode, struct file *file)
2120{
Denis V. Luneve372c412007-11-19 22:31:54 -08002121 return seq_open_net(inode, file, &unix_seq_ops,
2122 sizeof(struct unix_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123}
2124
Arjan van de Venda7071d2007-02-12 00:55:36 -08002125static const struct file_operations unix_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 .owner = THIS_MODULE,
2127 .open = unix_seq_open,
2128 .read = seq_read,
2129 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -08002130 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131};
2132
2133#endif
2134
2135static struct net_proto_family unix_family_ops = {
2136 .family = PF_UNIX,
2137 .create = unix_create,
2138 .owner = THIS_MODULE,
2139};
2140
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002141
2142static int unix_net_init(struct net *net)
2143{
2144 int error = -ENOMEM;
2145
2146#ifdef CONFIG_PROC_FS
2147 if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops))
2148 goto out;
2149#endif
2150 error = 0;
2151out:
2152 return 0;
2153}
2154
2155static void unix_net_exit(struct net *net)
2156{
2157 proc_net_remove(net, "unix");
2158}
2159
2160static struct pernet_operations unix_net_ops = {
2161 .init = unix_net_init,
2162 .exit = unix_net_exit,
2163};
2164
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165static int __init af_unix_init(void)
2166{
2167 int rc = -1;
2168 struct sk_buff *dummy_skb;
2169
YOSHIFUJI Hideakief047f52006-09-01 00:29:06 -07002170 BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171
2172 rc = proto_register(&unix_proto, 1);
YOSHIFUJI Hideakiac7bfa62007-02-09 23:25:23 +09002173 if (rc != 0) {
2174 printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 __FUNCTION__);
2176 goto out;
2177 }
2178
2179 sock_register(&unix_family_ops);
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002180 register_pernet_subsys(&unix_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181 unix_sysctl_register();
2182out:
2183 return rc;
2184}
2185
2186static void __exit af_unix_exit(void)
2187{
2188 sock_unregister(PF_UNIX);
2189 unix_sysctl_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 proto_unregister(&unix_proto);
Denis V. Lunev097e66c2007-11-19 22:29:30 -08002191 unregister_pernet_subsys(&unix_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002192}
2193
2194module_init(af_unix_init);
2195module_exit(af_unix_exit);
2196
2197MODULE_LICENSE("GPL");
2198MODULE_ALIAS_NETPROTO(PF_UNIX);