Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | * 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> | |
1da177e4 | 86 | #include <linux/kernel.h> |
1da177e4 LT |
87 | #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> | |
457c4cbc | 106 | #include <net/net_namespace.h> |
1da177e4 | 107 | #include <net/sock.h> |
c752f073 | 108 | #include <net/tcp_states.h> |
1da177e4 LT |
109 | #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> | |
1da177e4 LT |
115 | #include <linux/rtnetlink.h> |
116 | #include <linux/mount.h> | |
117 | #include <net/checksum.h> | |
118 | #include <linux/security.h> | |
119 | ||
18adaf06 | 120 | int sysctl_unix_max_dgram_qlen __read_mostly = 10; |
1da177e4 | 121 | |
13111698 AB |
122 | static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; |
123 | static DEFINE_SPINLOCK(unix_table_lock); | |
1da177e4 LT |
124 | static 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 | ||
13111698 AB |
130 | static 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 | ||
139 | static 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 | ||
877ce7c1 | 156 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 157 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 158 | { |
dc49c1f9 | 159 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
877ce7c1 CZ |
160 | } |
161 | ||
162 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
163 | { | |
dc49c1f9 | 164 | scm->secid = *UNIXSID(skb); |
877ce7c1 CZ |
165 | } |
166 | #else | |
dc49c1f9 | 167 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
168 | { } |
169 | ||
170 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
171 | { } | |
172 | #endif /* CONFIG_SECURITY_NETWORK */ | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * SMP locking strategy: | |
fbe9cc4a | 176 | * hash table is protected with spinlock unix_table_lock |
1da177e4 LT |
177 | * each socket state is protected by separate rwlock. |
178 | */ | |
179 | ||
44bb9363 | 180 | static inline unsigned unix_hash_fold(__wsum n) |
1da177e4 | 181 | { |
44bb9363 | 182 | unsigned hash = (__force unsigned)n; |
1da177e4 LT |
183 | 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 | ||
190 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
191 | { | |
192 | return unix_peer(osk) == sk; | |
193 | } | |
194 | ||
195 | static 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 | ||
200 | static struct sock *unix_peer_get(struct sock *s) | |
201 | { | |
202 | struct sock *peer; | |
203 | ||
1c92b4e5 | 204 | unix_state_lock(s); |
1da177e4 LT |
205 | peer = unix_peer(s); |
206 | if (peer) | |
207 | sock_hold(peer); | |
1c92b4e5 | 208 | unix_state_unlock(s); |
1da177e4 LT |
209 | return peer; |
210 | } | |
211 | ||
212 | static 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 | */ | |
ac7bfa62 | 224 | |
1da177e4 LT |
225 | static 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 | ||
248 | static void __unix_remove_socket(struct sock *sk) | |
249 | { | |
250 | sk_del_node_init(sk); | |
251 | } | |
252 | ||
253 | static 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 | ||
259 | static inline void unix_remove_socket(struct sock *sk) | |
260 | { | |
fbe9cc4a | 261 | spin_lock(&unix_table_lock); |
1da177e4 | 262 | __unix_remove_socket(sk); |
fbe9cc4a | 263 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
264 | } |
265 | ||
266 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
267 | { | |
fbe9cc4a | 268 | spin_lock(&unix_table_lock); |
1da177e4 | 269 | __unix_insert_socket(list, sk); |
fbe9cc4a | 270 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
271 | } |
272 | ||
097e66c5 DL |
273 | static struct sock *__unix_find_socket_byname(struct net *net, |
274 | struct sockaddr_un *sunname, | |
1da177e4 LT |
275 | 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 | ||
097e66c5 DL |
283 | if (s->sk_net != net) |
284 | continue; | |
285 | ||
1da177e4 LT |
286 | if (u->addr->len == len && |
287 | !memcmp(u->addr->name, sunname, len)) | |
288 | goto found; | |
289 | } | |
290 | s = NULL; | |
291 | found: | |
292 | return s; | |
293 | } | |
294 | ||
097e66c5 DL |
295 | static inline struct sock *unix_find_socket_byname(struct net *net, |
296 | struct sockaddr_un *sunname, | |
1da177e4 LT |
297 | int len, int type, |
298 | unsigned hash) | |
299 | { | |
300 | struct sock *s; | |
301 | ||
fbe9cc4a | 302 | spin_lock(&unix_table_lock); |
097e66c5 | 303 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
304 | if (s) |
305 | sock_hold(s); | |
fbe9cc4a | 306 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
307 | return s; |
308 | } | |
309 | ||
097e66c5 | 310 | static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i) |
1da177e4 LT |
311 | { |
312 | struct sock *s; | |
313 | struct hlist_node *node; | |
314 | ||
fbe9cc4a | 315 | spin_lock(&unix_table_lock); |
1da177e4 LT |
316 | 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 | ||
097e66c5 DL |
320 | if (s->sk_net != net) |
321 | continue; | |
322 | ||
1da177e4 LT |
323 | if(dentry && dentry->d_inode == i) |
324 | { | |
325 | sock_hold(s); | |
326 | goto found; | |
327 | } | |
328 | } | |
329 | s = NULL; | |
330 | found: | |
fbe9cc4a | 331 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
332 | return s; |
333 | } | |
334 | ||
335 | static inline int unix_writable(struct sock *sk) | |
336 | { | |
337 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
338 | } | |
339 | ||
340 | static 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)) | |
71e20f18 | 345 | wake_up_interruptible_sync(sk->sk_sleep); |
1da177e4 LT |
346 | 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. */ | |
355 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
356 | { | |
b03efcfb | 357 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
358 | 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 | ||
372 | static 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 | ||
395 | static 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 */ | |
1c92b4e5 | 407 | unix_state_lock(sk); |
1da177e4 LT |
408 | 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; | |
1c92b4e5 | 416 | unix_state_unlock(sk); |
1da177e4 LT |
417 | |
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) { | |
1c92b4e5 | 424 | unix_state_lock(skpair); |
1da177e4 LT |
425 | /* No more writes */ |
426 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
427 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
428 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 429 | unix_state_unlock(skpair); |
1da177e4 LT |
430 | 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 | ||
9305cfa4 | 468 | if (unix_tot_inflight) |
ac7bfa62 | 469 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
470 | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static 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 */ | |
1c92b4e5 | 486 | unix_state_lock(sk); |
1da177e4 LT |
487 | 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 */ | |
b488893a | 494 | sk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
495 | sk->sk_peercred.uid = current->euid; |
496 | sk->sk_peercred.gid = current->egid; | |
497 | err = 0; | |
498 | ||
499 | out_unlock: | |
1c92b4e5 | 500 | unix_state_unlock(sk); |
1da177e4 LT |
501 | out: |
502 | return err; | |
503 | } | |
504 | ||
505 | static int unix_release(struct socket *); | |
506 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
507 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
508 | int addr_len, int flags); | |
509 | static int unix_socketpair(struct socket *, struct socket *); | |
510 | static int unix_accept(struct socket *, struct socket *, int); | |
511 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
512 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
513 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); | |
514 | static int unix_shutdown(struct socket *, int); | |
515 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
516 | struct msghdr *, size_t); | |
517 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
518 | struct msghdr *, size_t, int); | |
519 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
520 | struct msghdr *, size_t); | |
521 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
522 | struct msghdr *, size_t, int); | |
523 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
524 | int, int); | |
525 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
526 | struct msghdr *, size_t); | |
527 | ||
90ddc4f0 | 528 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
529 | .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 | ||
90ddc4f0 | 549 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
550 | .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 | ||
90ddc4f0 | 570 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
571 | .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 | ||
591 | static struct proto unix_proto = { | |
592 | .name = "UNIX", | |
593 | .owner = THIS_MODULE, | |
594 | .obj_size = sizeof(struct unix_sock), | |
595 | }; | |
596 | ||
a09785a2 IM |
597 | /* |
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 | */ | |
603 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
604 | ||
1b8d7ae4 | 605 | static struct sock * unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
606 | { |
607 | struct sock *sk = NULL; | |
608 | struct unix_sock *u; | |
609 | ||
284b327b PE |
610 | atomic_inc(&unix_nr_socks); |
611 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
612 | goto out; |
613 | ||
6257ff21 | 614 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
615 | if (!sk) |
616 | goto out; | |
617 | ||
1da177e4 | 618 | sock_init_data(sock,sk); |
a09785a2 IM |
619 | lockdep_set_class(&sk->sk_receive_queue.lock, |
620 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
621 | |
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; | |
fd19f329 | 628 | spin_lock_init(&u->lock); |
1fd05ba5 MS |
629 | atomic_set(&u->inflight, 0); |
630 | INIT_LIST_HEAD(&u->link); | |
57b47a53 | 631 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 LT |
632 | init_waitqueue_head(&u->peer_wait); |
633 | unix_insert_socket(unix_sockets_unbound, sk); | |
634 | out: | |
284b327b PE |
635 | if (sk == NULL) |
636 | atomic_dec(&unix_nr_socks); | |
1da177e4 LT |
637 | return sk; |
638 | } | |
639 | ||
1b8d7ae4 | 640 | static int unix_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
641 | { |
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 | ||
1b8d7ae4 | 667 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
668 | } |
669 | ||
670 | static 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 | ||
682 | static int unix_autobind(struct socket *sock) | |
683 | { | |
684 | struct sock *sk = sock->sk; | |
097e66c5 | 685 | struct net *net = sk->sk_net; |
1da177e4 LT |
686 | struct unix_sock *u = unix_sk(sk); |
687 | static u32 ordernum = 1; | |
688 | struct unix_address * addr; | |
689 | int err; | |
690 | ||
57b47a53 | 691 | mutex_lock(&u->readlock); |
1da177e4 LT |
692 | |
693 | err = 0; | |
694 | if (u->addr) | |
695 | goto out; | |
696 | ||
697 | err = -ENOMEM; | |
0da974f4 | 698 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
699 | if (!addr) |
700 | goto out; | |
701 | ||
1da177e4 LT |
702 | addr->name->sun_family = AF_UNIX; |
703 | atomic_set(&addr->refcnt, 1); | |
704 | ||
705 | retry: | |
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 | ||
fbe9cc4a | 709 | spin_lock(&unix_table_lock); |
1da177e4 LT |
710 | ordernum = (ordernum+1)&0xFFFFF; |
711 | ||
097e66c5 | 712 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 713 | addr->hash)) { |
fbe9cc4a | 714 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
715 | /* 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); | |
fbe9cc4a | 725 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
726 | err = 0; |
727 | ||
57b47a53 | 728 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
729 | return err; |
730 | } | |
731 | ||
097e66c5 DL |
732 | static struct sock *unix_find_other(struct net *net, |
733 | struct sockaddr_un *sunname, int len, | |
1da177e4 LT |
734 | int type, unsigned hash, int *error) |
735 | { | |
736 | struct sock *u; | |
737 | struct nameidata nd; | |
738 | int err = 0; | |
ac7bfa62 | 739 | |
1da177e4 LT |
740 | if (sunname->sun_path[0]) { |
741 | err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd); | |
742 | if (err) | |
743 | goto fail; | |
e4543edd | 744 | err = vfs_permission(&nd, MAY_WRITE); |
1da177e4 LT |
745 | if (err) |
746 | goto put_fail; | |
747 | ||
748 | err = -ECONNREFUSED; | |
749 | if (!S_ISSOCK(nd.dentry->d_inode->i_mode)) | |
750 | goto put_fail; | |
097e66c5 | 751 | u=unix_find_socket_byinode(net, nd.dentry->d_inode); |
1da177e4 LT |
752 | 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; | |
097e66c5 | 767 | u=unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
768 | 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 | ||
778 | put_fail: | |
779 | path_release(&nd); | |
780 | fail: | |
781 | *error=err; | |
782 | return NULL; | |
783 | } | |
784 | ||
785 | ||
786 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
787 | { | |
788 | struct sock *sk = sock->sk; | |
097e66c5 | 789 | struct net *net = sk->sk_net; |
1da177e4 LT |
790 | 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 | ||
57b47a53 | 813 | mutex_lock(&u->readlock); |
1da177e4 LT |
814 | |
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; | |
f81a0bff CH |
839 | |
840 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
841 | err = PTR_ERR(dentry); |
842 | if (IS_ERR(dentry)) | |
843 | goto out_mknod_unlock; | |
f81a0bff | 844 | |
1da177e4 LT |
845 | /* |
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; | |
1b1dcc1b | 853 | mutex_unlock(&nd.dentry->d_inode->i_mutex); |
1da177e4 LT |
854 | dput(nd.dentry); |
855 | nd.dentry = dentry; | |
856 | ||
857 | addr->hash = UNIX_HASH_SIZE; | |
858 | } | |
859 | ||
fbe9cc4a | 860 | spin_lock(&unix_table_lock); |
1da177e4 LT |
861 | |
862 | if (!sunaddr->sun_path[0]) { | |
863 | err = -EADDRINUSE; | |
097e66c5 | 864 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
865 | 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 | ||
882 | out_unlock: | |
fbe9cc4a | 883 | spin_unlock(&unix_table_lock); |
1da177e4 | 884 | out_up: |
57b47a53 | 885 | mutex_unlock(&u->readlock); |
1da177e4 LT |
886 | out: |
887 | return err; | |
888 | ||
889 | out_mknod_dput: | |
890 | dput(dentry); | |
891 | out_mknod_unlock: | |
1b1dcc1b | 892 | mutex_unlock(&nd.dentry->d_inode->i_mutex); |
1da177e4 LT |
893 | path_release(&nd); |
894 | out_mknod_parent: | |
895 | if (err==-EEXIST) | |
896 | err=-EADDRINUSE; | |
897 | unix_release_addr(addr); | |
898 | goto out_up; | |
899 | } | |
900 | ||
278a3de5 DM |
901 | static 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 | ||
916 | static 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 | ||
1da177e4 LT |
926 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
927 | int alen, int flags) | |
928 | { | |
929 | struct sock *sk = sock->sk; | |
097e66c5 | 930 | struct net *net = sk->sk_net; |
1da177e4 LT |
931 | 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 | ||
278a3de5 | 946 | restart: |
097e66c5 | 947 | other=unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
948 | if (!other) |
949 | goto out; | |
950 | ||
278a3de5 DM |
951 | 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 | } | |
1da177e4 LT |
959 | |
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; | |
278a3de5 | 973 | unix_state_double_lock(sk, other); |
1da177e4 LT |
974 | } |
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; | |
278a3de5 | 982 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
983 | |
984 | if (other != old_peer) | |
985 | unix_dgram_disconnected(sk, old_peer); | |
986 | sock_put(old_peer); | |
987 | } else { | |
988 | unix_peer(sk)=other; | |
278a3de5 | 989 | unix_state_double_unlock(sk, other); |
1da177e4 | 990 | } |
ac7bfa62 | 991 | return 0; |
1da177e4 LT |
992 | |
993 | out_unlock: | |
278a3de5 | 994 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
995 | sock_put(other); |
996 | out: | |
997 | return err; | |
998 | } | |
999 | ||
1000 | static 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) && | |
64a14651 | 1010 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1011 | other->sk_max_ack_backlog); |
1012 | ||
1c92b4e5 | 1013 | unix_state_unlock(other); |
1da177e4 LT |
1014 | |
1015 | if (sched) | |
1016 | timeo = schedule_timeout(timeo); | |
1017 | ||
1018 | finish_wait(&u->peer_wait, &wait); | |
1019 | return timeo; | |
1020 | } | |
1021 | ||
1022 | static 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; | |
097e66c5 | 1027 | struct net *net = sk->sk_net; |
1da177e4 LT |
1028 | 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 */ | |
1b8d7ae4 | 1056 | newsk = unix_create1(sk->sk_net, NULL); |
1da177e4 LT |
1057 | 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 | ||
1065 | restart: | |
1066 | /* Find listening sock. */ | |
097e66c5 | 1067 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1068 | if (!other) |
1069 | goto out; | |
1070 | ||
1071 | /* Latch state of peer */ | |
1c92b4e5 | 1072 | unix_state_lock(other); |
1da177e4 LT |
1073 | |
1074 | /* Apparently VFS overslept socket death. Retry. */ | |
1075 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1076 | unix_state_unlock(other); |
1da177e4 LT |
1077 | sock_put(other); |
1078 | goto restart; | |
1079 | } | |
1080 | ||
1081 | err = -ECONNREFUSED; | |
1082 | if (other->sk_state != TCP_LISTEN) | |
1083 | goto out_unlock; | |
1084 | ||
64a14651 | 1085 | if (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1086 | 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; | |
ac7bfa62 | 1098 | } |
1da177e4 LT |
1099 | |
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 | ||
1c92b4e5 | 1126 | unix_state_lock_nested(sk); |
1da177e4 LT |
1127 | |
1128 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1129 | unix_state_unlock(sk); |
1130 | unix_state_unlock(other); | |
1da177e4 LT |
1131 | sock_put(other); |
1132 | goto restart; | |
1133 | } | |
1134 | ||
1135 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1136 | if (err) { | |
1c92b4e5 | 1137 | unix_state_unlock(sk); |
1da177e4 LT |
1138 | 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; | |
b488893a | 1147 | newsk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1148 | 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 | ||
1da177e4 LT |
1167 | sock->state = SS_CONNECTED; |
1168 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1169 | sock_hold(newsk); |
1170 | ||
1171 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1172 | unix_peer(sk) = newsk; | |
1da177e4 | 1173 | |
1c92b4e5 | 1174 | unix_state_unlock(sk); |
1da177e4 LT |
1175 | |
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); | |
1da177e4 | 1179 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1180 | unix_state_unlock(other); |
1da177e4 LT |
1181 | other->sk_data_ready(other, 0); |
1182 | sock_put(other); | |
1183 | return 0; | |
1184 | ||
1185 | out_unlock: | |
1186 | if (other) | |
1c92b4e5 | 1187 | unix_state_unlock(other); |
1da177e4 LT |
1188 | |
1189 | out: | |
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 | ||
1199 | static 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; | |
b488893a | 1208 | ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1209 | 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 | ||
1221 | static 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 */ | |
1c92b4e5 | 1253 | unix_state_lock(tsk); |
1da177e4 LT |
1254 | newsock->state = SS_CONNECTED; |
1255 | sock_graft(tsk, newsock); | |
1c92b4e5 | 1256 | unix_state_unlock(tsk); |
1da177e4 LT |
1257 | return 0; |
1258 | ||
1259 | out: | |
1260 | return err; | |
1261 | } | |
1262 | ||
1263 | ||
1264 | static 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); | |
1c92b4e5 | 1283 | unix_state_lock(sk); |
1da177e4 LT |
1284 | 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 | } | |
1c92b4e5 | 1294 | unix_state_unlock(sk); |
1da177e4 LT |
1295 | sock_put(sk); |
1296 | out: | |
1297 | return err; | |
1298 | } | |
1299 | ||
1300 | static 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 | ||
1312 | static 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 | ||
1324 | static 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 | ||
1338 | static 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; | |
097e66c5 | 1343 | struct net *net = sk->sk_net; |
1da177e4 LT |
1344 | 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); | |
dc49c1f9 | 1392 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1393 | |
badff6d0 | 1394 | skb_reset_transport_header(skb); |
1da177e4 LT |
1395 | 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 | ||
1401 | restart: | |
1402 | if (!other) { | |
1403 | err = -ECONNRESET; | |
1404 | if (sunaddr == NULL) | |
1405 | goto out_free; | |
1406 | ||
097e66c5 | 1407 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 LT |
1408 | hash, &err); |
1409 | if (other==NULL) | |
1410 | goto out_free; | |
1411 | } | |
1412 | ||
1c92b4e5 | 1413 | unix_state_lock(other); |
1da177e4 LT |
1414 | 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 | */ | |
1c92b4e5 | 1423 | unix_state_unlock(other); |
1da177e4 LT |
1424 | sock_put(other); |
1425 | ||
1426 | err = 0; | |
1c92b4e5 | 1427 | unix_state_lock(sk); |
1da177e4 LT |
1428 | if (unix_peer(sk) == other) { |
1429 | unix_peer(sk)=NULL; | |
1c92b4e5 | 1430 | unix_state_unlock(sk); |
1da177e4 LT |
1431 | |
1432 | unix_dgram_disconnected(sk, other); | |
1433 | sock_put(other); | |
1434 | err = -ECONNREFUSED; | |
1435 | } else { | |
1c92b4e5 | 1436 | unix_state_unlock(sk); |
1da177e4 LT |
1437 | } |
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 && | |
64a14651 | 1456 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1457 | 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); | |
1c92b4e5 | 1473 | unix_state_unlock(other); |
1da177e4 LT |
1474 | other->sk_data_ready(other, len); |
1475 | sock_put(other); | |
1476 | scm_destroy(siocb->scm); | |
1477 | return len; | |
1478 | ||
1479 | out_unlock: | |
1c92b4e5 | 1480 | unix_state_unlock(other); |
1da177e4 LT |
1481 | out_free: |
1482 | kfree_skb(skb); | |
1483 | out: | |
1484 | if (other) | |
1485 | sock_put(other); | |
1486 | scm_destroy(siocb->scm); | |
1487 | return err; | |
1488 | } | |
1489 | ||
ac7bfa62 | 1490 | |
1da177e4 LT |
1491 | static 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; | |
830a1e5c | 1519 | other = unix_peer(sk); |
1da177e4 LT |
1520 | 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 | /* | |
e9df7d7f BL |
1530 | * Optimisation for the fact that under 0.01% of X |
1531 | * messages typically need breaking up. | |
1da177e4 LT |
1532 | */ |
1533 | ||
e9df7d7f | 1534 | size = len-sent; |
1da177e4 LT |
1535 | |
1536 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1537 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1538 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1539 | |
1540 | if (size > SKB_MAX_ALLOC) | |
1541 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1542 | |
1da177e4 LT |
1543 | /* |
1544 | * Grab a buffer | |
1545 | */ | |
ac7bfa62 | 1546 | |
1da177e4 LT |
1547 | 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 | ||
1c92b4e5 | 1570 | unix_state_lock(other); |
1da177e4 LT |
1571 | |
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); | |
1c92b4e5 | 1577 | unix_state_unlock(other); |
1da177e4 LT |
1578 | other->sk_data_ready(other, size); |
1579 | sent+=size; | |
1580 | } | |
1da177e4 LT |
1581 | |
1582 | scm_destroy(siocb->scm); | |
1583 | siocb->scm = NULL; | |
1584 | ||
1585 | return sent; | |
1586 | ||
1587 | pipe_err_free: | |
1c92b4e5 | 1588 | unix_state_unlock(other); |
1da177e4 LT |
1589 | kfree_skb(skb); |
1590 | pipe_err: | |
1591 | if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
1592 | send_sig(SIGPIPE,current,0); | |
1593 | err = -EPIPE; | |
1594 | out_err: | |
1da177e4 LT |
1595 | scm_destroy(siocb->scm); |
1596 | siocb->scm = NULL; | |
1597 | return sent ? : err; | |
1598 | } | |
1599 | ||
1600 | static 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; | |
ac7bfa62 | 1605 | |
1da177e4 LT |
1606 | 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 | } | |
ac7bfa62 | 1618 | |
1da177e4 LT |
1619 | static 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 | ||
1630 | static 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 | ||
57b47a53 | 1648 | mutex_lock(&u->readlock); |
1da177e4 LT |
1649 | |
1650 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
0a112258 FZ |
1651 | 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); | |
1da177e4 | 1658 | goto out_unlock; |
0a112258 | 1659 | } |
1da177e4 | 1660 | |
71e20f18 | 1661 | wake_up_interruptible_sync(&u->peer_wait); |
1da177e4 LT |
1662 | |
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); | |
877ce7c1 | 1680 | unix_set_secdata(siocb->scm, skb); |
1da177e4 LT |
1681 | |
1682 | if (!(flags & MSG_PEEK)) | |
1683 | { | |
1684 | if (UNIXCB(skb).fp) | |
1685 | unix_detach_fds(siocb->scm, skb); | |
1686 | } | |
ac7bfa62 | 1687 | else |
1da177e4 LT |
1688 | { |
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) | |
ac7bfa62 YH |
1695 | |
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 | ||
1da177e4 LT |
1700 | */ |
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 | ||
1708 | out_free: | |
1709 | skb_free_datagram(sk,skb); | |
1710 | out_unlock: | |
57b47a53 | 1711 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1712 | out: |
1713 | return err; | |
1714 | } | |
1715 | ||
1716 | /* | |
1717 | * Sleep until data has arrive. But check for races.. | |
1718 | */ | |
ac7bfa62 | 1719 | |
1da177e4 LT |
1720 | static long unix_stream_data_wait(struct sock * sk, long timeo) |
1721 | { | |
1722 | DEFINE_WAIT(wait); | |
1723 | ||
1c92b4e5 | 1724 | unix_state_lock(sk); |
1da177e4 LT |
1725 | |
1726 | for (;;) { | |
1727 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1728 | ||
b03efcfb | 1729 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
1730 | 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); | |
1c92b4e5 | 1737 | unix_state_unlock(sk); |
1da177e4 | 1738 | timeo = schedule_timeout(timeo); |
1c92b4e5 | 1739 | unix_state_lock(sk); |
1da177e4 LT |
1740 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1741 | } | |
1742 | ||
1743 | finish_wait(sk->sk_sleep, &wait); | |
1c92b4e5 | 1744 | unix_state_unlock(sk); |
1da177e4 LT |
1745 | return timeo; |
1746 | } | |
1747 | ||
1748 | ||
1749 | ||
1750 | static 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 | ||
57b47a53 | 1787 | mutex_lock(&u->readlock); |
1da177e4 LT |
1788 | |
1789 | do | |
1790 | { | |
1791 | int chunk; | |
1792 | struct sk_buff *skb; | |
1793 | ||
3c0d2f37 | 1794 | unix_state_lock(sk); |
1da177e4 LT |
1795 | skb = skb_dequeue(&sk->sk_receive_queue); |
1796 | if (skb==NULL) | |
1797 | { | |
1798 | if (copied >= target) | |
3c0d2f37 | 1799 | goto unlock; |
1da177e4 LT |
1800 | |
1801 | /* | |
1802 | * POSIX 1003.1g mandates this order. | |
1803 | */ | |
ac7bfa62 | 1804 | |
1da177e4 | 1805 | if ((err = sock_error(sk)) != 0) |
3c0d2f37 | 1806 | goto unlock; |
1da177e4 | 1807 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
1808 | goto unlock; |
1809 | ||
1810 | unix_state_unlock(sk); | |
1da177e4 LT |
1811 | err = -EAGAIN; |
1812 | if (!timeo) | |
1813 | break; | |
57b47a53 | 1814 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1815 | |
1816 | timeo = unix_stream_data_wait(sk, timeo); | |
1817 | ||
1818 | if (signal_pending(current)) { | |
1819 | err = sock_intr_errno(timeo); | |
1820 | goto out; | |
1821 | } | |
57b47a53 | 1822 | mutex_lock(&u->readlock); |
1da177e4 | 1823 | continue; |
3c0d2f37 MS |
1824 | unlock: |
1825 | unix_state_unlock(sk); | |
1826 | break; | |
1da177e4 | 1827 | } |
3c0d2f37 | 1828 | unix_state_unlock(sk); |
1da177e4 LT |
1829 | |
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 | ||
57b47a53 | 1892 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1893 | scm_recv(sock, msg, siocb->scm, flags); |
1894 | out: | |
1895 | return copied ? : err; | |
1896 | } | |
1897 | ||
1898 | static 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) { | |
1c92b4e5 | 1906 | unix_state_lock(sk); |
1da177e4 LT |
1907 | sk->sk_shutdown |= mode; |
1908 | other=unix_peer(sk); | |
1909 | if (other) | |
1910 | sock_hold(other); | |
1c92b4e5 | 1911 | unix_state_unlock(sk); |
1da177e4 LT |
1912 | 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; | |
1c92b4e5 | 1923 | unix_state_lock(other); |
1da177e4 | 1924 | other->sk_shutdown |= peer_mode; |
1c92b4e5 | 1925 | unix_state_unlock(other); |
1da177e4 LT |
1926 | 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 | ||
1940 | static 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: | |
b5e5fa5e | 1977 | err = -ENOIOCTLCMD; |
1da177e4 LT |
1978 | break; |
1979 | } | |
1980 | return err; | |
1981 | } | |
1982 | ||
1983 | static 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; | |
f348d70a DL |
1996 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1997 | mask |= POLLRDHUP; | |
1da177e4 LT |
1998 | |
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 | |
097e66c5 DL |
2020 | struct unix_iter_state { |
2021 | struct net *net; | |
2022 | int i; | |
2023 | }; | |
2024 | static struct sock *unix_seq_idx(struct unix_iter_state *iter, loff_t pos) | |
1da177e4 LT |
2025 | { |
2026 | loff_t off = 0; | |
2027 | struct sock *s; | |
2028 | ||
097e66c5 DL |
2029 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
2030 | if (s->sk_net != iter->net) | |
2031 | continue; | |
ac7bfa62 | 2032 | if (off == pos) |
1da177e4 LT |
2033 | return s; |
2034 | ++off; | |
2035 | } | |
2036 | return NULL; | |
2037 | } | |
2038 | ||
2039 | ||
2040 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) | |
2041 | { | |
097e66c5 | 2042 | struct unix_iter_state *iter = seq->private; |
fbe9cc4a | 2043 | spin_lock(&unix_table_lock); |
097e66c5 | 2044 | return *pos ? unix_seq_idx(iter, *pos - 1) : ((void *) 1); |
1da177e4 LT |
2045 | } |
2046 | ||
2047 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2048 | { | |
097e66c5 DL |
2049 | struct unix_iter_state *iter = seq->private; |
2050 | struct sock *sk = v; | |
1da177e4 LT |
2051 | ++*pos; |
2052 | ||
ac7bfa62 | 2053 | if (v == (void *)1) |
097e66c5 DL |
2054 | sk = first_unix_socket(&iter->i); |
2055 | else | |
2056 | sk = next_unix_socket(&iter->i, sk); | |
2057 | while (sk && (sk->sk_net != iter->net)) | |
2058 | sk = next_unix_socket(&iter->i, sk); | |
2059 | return sk; | |
1da177e4 LT |
2060 | } |
2061 | ||
2062 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
2063 | { | |
fbe9cc4a | 2064 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2065 | } |
2066 | ||
2067 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2068 | { | |
ac7bfa62 | 2069 | |
1da177e4 LT |
2070 | 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); | |
1c92b4e5 | 2076 | unix_state_lock(s); |
1da177e4 LT |
2077 | |
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 | } | |
1c92b4e5 | 2104 | unix_state_unlock(s); |
1da177e4 LT |
2105 | seq_putc(seq, '\n'); |
2106 | } | |
2107 | ||
2108 | return 0; | |
2109 | } | |
2110 | ||
56b3d975 | 2111 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2112 | .start = unix_seq_start, |
2113 | .next = unix_seq_next, | |
2114 | .stop = unix_seq_stop, | |
2115 | .show = unix_seq_show, | |
2116 | }; | |
2117 | ||
2118 | ||
2119 | static int unix_seq_open(struct inode *inode, struct file *file) | |
2120 | { | |
097e66c5 DL |
2121 | struct unix_iter_state *it; |
2122 | ||
2123 | it = __seq_open_private(file, &unix_seq_ops, | |
2124 | sizeof(struct unix_iter_state)); | |
2125 | if (it == NULL) | |
2126 | return -ENOMEM; | |
2127 | ||
2128 | it->net = get_proc_net(inode); | |
2129 | if (it->net == NULL) { | |
2130 | seq_release_private(inode, file); | |
2131 | return -ENXIO; | |
2132 | } | |
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | static int unix_seq_release(struct inode *inode, struct file *file) | |
2137 | { | |
2138 | struct seq_file *seq = file->private_data; | |
2139 | struct unix_iter_state *iter = seq->private; | |
2140 | put_net(iter->net); | |
2141 | return seq_release_private(inode, file); | |
1da177e4 LT |
2142 | } |
2143 | ||
da7071d7 | 2144 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2145 | .owner = THIS_MODULE, |
2146 | .open = unix_seq_open, | |
2147 | .read = seq_read, | |
2148 | .llseek = seq_lseek, | |
097e66c5 | 2149 | .release = unix_seq_release, |
1da177e4 LT |
2150 | }; |
2151 | ||
2152 | #endif | |
2153 | ||
2154 | static struct net_proto_family unix_family_ops = { | |
2155 | .family = PF_UNIX, | |
2156 | .create = unix_create, | |
2157 | .owner = THIS_MODULE, | |
2158 | }; | |
2159 | ||
097e66c5 DL |
2160 | |
2161 | static int unix_net_init(struct net *net) | |
2162 | { | |
2163 | int error = -ENOMEM; | |
2164 | ||
2165 | #ifdef CONFIG_PROC_FS | |
2166 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) | |
2167 | goto out; | |
2168 | #endif | |
2169 | error = 0; | |
2170 | out: | |
2171 | return 0; | |
2172 | } | |
2173 | ||
2174 | static void unix_net_exit(struct net *net) | |
2175 | { | |
2176 | proc_net_remove(net, "unix"); | |
2177 | } | |
2178 | ||
2179 | static struct pernet_operations unix_net_ops = { | |
2180 | .init = unix_net_init, | |
2181 | .exit = unix_net_exit, | |
2182 | }; | |
2183 | ||
1da177e4 LT |
2184 | static int __init af_unix_init(void) |
2185 | { | |
2186 | int rc = -1; | |
2187 | struct sk_buff *dummy_skb; | |
2188 | ||
ef047f5e | 2189 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
2190 | |
2191 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2192 | if (rc != 0) { |
2193 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
1da177e4 LT |
2194 | __FUNCTION__); |
2195 | goto out; | |
2196 | } | |
2197 | ||
2198 | sock_register(&unix_family_ops); | |
097e66c5 | 2199 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2200 | unix_sysctl_register(); |
2201 | out: | |
2202 | return rc; | |
2203 | } | |
2204 | ||
2205 | static void __exit af_unix_exit(void) | |
2206 | { | |
2207 | sock_unregister(PF_UNIX); | |
2208 | unix_sysctl_unregister(); | |
1da177e4 | 2209 | proto_unregister(&unix_proto); |
097e66c5 | 2210 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2211 | } |
2212 | ||
2213 | module_init(af_unix_init); | |
2214 | module_exit(af_unix_exit); | |
2215 | ||
2216 | MODULE_LICENSE("GPL"); | |
2217 | MODULE_ALIAS_NETPROTO(PF_UNIX); |