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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 | ||
13111698 AB |
120 | static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; |
121 | static DEFINE_SPINLOCK(unix_table_lock); | |
1da177e4 LT |
122 | static atomic_t unix_nr_socks = ATOMIC_INIT(0); |
123 | ||
124 | #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) | |
125 | ||
126 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE) | |
127 | ||
877ce7c1 | 128 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 129 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 130 | { |
dc49c1f9 | 131 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
877ce7c1 CZ |
132 | } |
133 | ||
134 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
135 | { | |
dc49c1f9 | 136 | scm->secid = *UNIXSID(skb); |
877ce7c1 CZ |
137 | } |
138 | #else | |
dc49c1f9 | 139 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
140 | { } |
141 | ||
142 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
143 | { } | |
144 | #endif /* CONFIG_SECURITY_NETWORK */ | |
145 | ||
1da177e4 LT |
146 | /* |
147 | * SMP locking strategy: | |
fbe9cc4a | 148 | * hash table is protected with spinlock unix_table_lock |
1da177e4 LT |
149 | * each socket state is protected by separate rwlock. |
150 | */ | |
151 | ||
44bb9363 | 152 | static inline unsigned unix_hash_fold(__wsum n) |
1da177e4 | 153 | { |
44bb9363 | 154 | unsigned hash = (__force unsigned)n; |
1da177e4 LT |
155 | hash ^= hash>>16; |
156 | hash ^= hash>>8; | |
157 | return hash&(UNIX_HASH_SIZE-1); | |
158 | } | |
159 | ||
160 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
161 | ||
162 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
163 | { | |
164 | return unix_peer(osk) == sk; | |
165 | } | |
166 | ||
167 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
168 | { | |
169 | return (unix_peer(osk) == NULL || unix_our_peer(sk, osk)); | |
170 | } | |
171 | ||
172 | static struct sock *unix_peer_get(struct sock *s) | |
173 | { | |
174 | struct sock *peer; | |
175 | ||
1c92b4e5 | 176 | unix_state_lock(s); |
1da177e4 LT |
177 | peer = unix_peer(s); |
178 | if (peer) | |
179 | sock_hold(peer); | |
1c92b4e5 | 180 | unix_state_unlock(s); |
1da177e4 LT |
181 | return peer; |
182 | } | |
183 | ||
184 | static inline void unix_release_addr(struct unix_address *addr) | |
185 | { | |
186 | if (atomic_dec_and_test(&addr->refcnt)) | |
187 | kfree(addr); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Check unix socket name: | |
192 | * - should be not zero length. | |
193 | * - if started by not zero, should be NULL terminated (FS object) | |
194 | * - if started by zero, it is abstract name. | |
195 | */ | |
ac7bfa62 | 196 | |
1da177e4 LT |
197 | static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp) |
198 | { | |
199 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
200 | return -EINVAL; | |
201 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
202 | return -EINVAL; | |
203 | if (sunaddr->sun_path[0]) { | |
204 | /* | |
205 | * This may look like an off by one error but it is a bit more | |
206 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
207 | * sun_path[108] doesnt as such exist. However in kernel space | |
208 | * we are guaranteed that it is a valid memory location in our | |
209 | * kernel address buffer. | |
210 | */ | |
211 | ((char *)sunaddr)[len]=0; | |
212 | len = strlen(sunaddr->sun_path)+1+sizeof(short); | |
213 | return len; | |
214 | } | |
215 | ||
216 | *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0)); | |
217 | return len; | |
218 | } | |
219 | ||
220 | static void __unix_remove_socket(struct sock *sk) | |
221 | { | |
222 | sk_del_node_init(sk); | |
223 | } | |
224 | ||
225 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
226 | { | |
227 | BUG_TRAP(sk_unhashed(sk)); | |
228 | sk_add_node(sk, list); | |
229 | } | |
230 | ||
231 | static inline void unix_remove_socket(struct sock *sk) | |
232 | { | |
fbe9cc4a | 233 | spin_lock(&unix_table_lock); |
1da177e4 | 234 | __unix_remove_socket(sk); |
fbe9cc4a | 235 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
236 | } |
237 | ||
238 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
239 | { | |
fbe9cc4a | 240 | spin_lock(&unix_table_lock); |
1da177e4 | 241 | __unix_insert_socket(list, sk); |
fbe9cc4a | 242 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
243 | } |
244 | ||
097e66c5 DL |
245 | static struct sock *__unix_find_socket_byname(struct net *net, |
246 | struct sockaddr_un *sunname, | |
1da177e4 LT |
247 | int len, int type, unsigned hash) |
248 | { | |
249 | struct sock *s; | |
250 | struct hlist_node *node; | |
251 | ||
252 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { | |
253 | struct unix_sock *u = unix_sk(s); | |
254 | ||
878628fb | 255 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
256 | continue; |
257 | ||
1da177e4 LT |
258 | if (u->addr->len == len && |
259 | !memcmp(u->addr->name, sunname, len)) | |
260 | goto found; | |
261 | } | |
262 | s = NULL; | |
263 | found: | |
264 | return s; | |
265 | } | |
266 | ||
097e66c5 DL |
267 | static inline struct sock *unix_find_socket_byname(struct net *net, |
268 | struct sockaddr_un *sunname, | |
1da177e4 LT |
269 | int len, int type, |
270 | unsigned hash) | |
271 | { | |
272 | struct sock *s; | |
273 | ||
fbe9cc4a | 274 | spin_lock(&unix_table_lock); |
097e66c5 | 275 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
276 | if (s) |
277 | sock_hold(s); | |
fbe9cc4a | 278 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
279 | return s; |
280 | } | |
281 | ||
097e66c5 | 282 | static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i) |
1da177e4 LT |
283 | { |
284 | struct sock *s; | |
285 | struct hlist_node *node; | |
286 | ||
fbe9cc4a | 287 | spin_lock(&unix_table_lock); |
1da177e4 LT |
288 | sk_for_each(s, node, |
289 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { | |
290 | struct dentry *dentry = unix_sk(s)->dentry; | |
291 | ||
878628fb | 292 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
293 | continue; |
294 | ||
1da177e4 LT |
295 | if(dentry && dentry->d_inode == i) |
296 | { | |
297 | sock_hold(s); | |
298 | goto found; | |
299 | } | |
300 | } | |
301 | s = NULL; | |
302 | found: | |
fbe9cc4a | 303 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
304 | return s; |
305 | } | |
306 | ||
307 | static inline int unix_writable(struct sock *sk) | |
308 | { | |
309 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
310 | } | |
311 | ||
312 | static void unix_write_space(struct sock *sk) | |
313 | { | |
314 | read_lock(&sk->sk_callback_lock); | |
315 | if (unix_writable(sk)) { | |
316 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
71e20f18 | 317 | wake_up_interruptible_sync(sk->sk_sleep); |
8d8ad9d7 | 318 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
319 | } |
320 | read_unlock(&sk->sk_callback_lock); | |
321 | } | |
322 | ||
323 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
324 | * queue of packets arrived from previous peer. First, it allows to do | |
325 | * flow control based only on wmem_alloc; second, sk connected to peer | |
326 | * may receive messages only from that peer. */ | |
327 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
328 | { | |
b03efcfb | 329 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
330 | skb_queue_purge(&sk->sk_receive_queue); |
331 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
332 | ||
333 | /* If one link of bidirectional dgram pipe is disconnected, | |
334 | * we signal error. Messages are lost. Do not make this, | |
335 | * when peer was not connected to us. | |
336 | */ | |
337 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
338 | other->sk_err = ECONNRESET; | |
339 | other->sk_error_report(other); | |
340 | } | |
341 | } | |
342 | } | |
343 | ||
344 | static void unix_sock_destructor(struct sock *sk) | |
345 | { | |
346 | struct unix_sock *u = unix_sk(sk); | |
347 | ||
348 | skb_queue_purge(&sk->sk_receive_queue); | |
349 | ||
350 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
351 | BUG_TRAP(sk_unhashed(sk)); | |
352 | BUG_TRAP(!sk->sk_socket); | |
353 | if (!sock_flag(sk, SOCK_DEAD)) { | |
354 | printk("Attempt to release alive unix socket: %p\n", sk); | |
355 | return; | |
356 | } | |
357 | ||
358 | if (u->addr) | |
359 | unix_release_addr(u->addr); | |
360 | ||
361 | atomic_dec(&unix_nr_socks); | |
362 | #ifdef UNIX_REFCNT_DEBUG | |
363 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks)); | |
364 | #endif | |
365 | } | |
366 | ||
367 | static int unix_release_sock (struct sock *sk, int embrion) | |
368 | { | |
369 | struct unix_sock *u = unix_sk(sk); | |
370 | struct dentry *dentry; | |
371 | struct vfsmount *mnt; | |
372 | struct sock *skpair; | |
373 | struct sk_buff *skb; | |
374 | int state; | |
375 | ||
376 | unix_remove_socket(sk); | |
377 | ||
378 | /* Clear state */ | |
1c92b4e5 | 379 | unix_state_lock(sk); |
1da177e4 LT |
380 | sock_orphan(sk); |
381 | sk->sk_shutdown = SHUTDOWN_MASK; | |
382 | dentry = u->dentry; | |
383 | u->dentry = NULL; | |
384 | mnt = u->mnt; | |
385 | u->mnt = NULL; | |
386 | state = sk->sk_state; | |
387 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 388 | unix_state_unlock(sk); |
1da177e4 LT |
389 | |
390 | wake_up_interruptible_all(&u->peer_wait); | |
391 | ||
392 | skpair=unix_peer(sk); | |
393 | ||
394 | if (skpair!=NULL) { | |
395 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { | |
1c92b4e5 | 396 | unix_state_lock(skpair); |
1da177e4 LT |
397 | /* No more writes */ |
398 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
399 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
400 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 401 | unix_state_unlock(skpair); |
1da177e4 LT |
402 | skpair->sk_state_change(skpair); |
403 | read_lock(&skpair->sk_callback_lock); | |
8d8ad9d7 | 404 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 LT |
405 | read_unlock(&skpair->sk_callback_lock); |
406 | } | |
407 | sock_put(skpair); /* It may now die */ | |
408 | unix_peer(sk) = NULL; | |
409 | } | |
410 | ||
411 | /* Try to flush out this socket. Throw out buffers at least */ | |
412 | ||
413 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
414 | if (state==TCP_LISTEN) | |
415 | unix_release_sock(skb->sk, 1); | |
416 | /* passed fds are erased in the kfree_skb hook */ | |
417 | kfree_skb(skb); | |
418 | } | |
419 | ||
420 | if (dentry) { | |
421 | dput(dentry); | |
422 | mntput(mnt); | |
423 | } | |
424 | ||
425 | sock_put(sk); | |
426 | ||
427 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
428 | ||
429 | /* | |
430 | * Fixme: BSD difference: In BSD all sockets connected to use get | |
431 | * ECONNRESET and we die on the spot. In Linux we behave | |
432 | * like files and pipes do and wait for the last | |
433 | * dereference. | |
434 | * | |
435 | * Can't we simply set sock->err? | |
436 | * | |
437 | * What the above comment does talk about? --ANK(980817) | |
438 | */ | |
439 | ||
9305cfa4 | 440 | if (unix_tot_inflight) |
ac7bfa62 | 441 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
442 | |
443 | return 0; | |
444 | } | |
445 | ||
446 | static int unix_listen(struct socket *sock, int backlog) | |
447 | { | |
448 | int err; | |
449 | struct sock *sk = sock->sk; | |
450 | struct unix_sock *u = unix_sk(sk); | |
451 | ||
452 | err = -EOPNOTSUPP; | |
453 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
454 | goto out; /* Only stream/seqpacket sockets accept */ | |
455 | err = -EINVAL; | |
456 | if (!u->addr) | |
457 | goto out; /* No listens on an unbound socket */ | |
1c92b4e5 | 458 | unix_state_lock(sk); |
1da177e4 LT |
459 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
460 | goto out_unlock; | |
461 | if (backlog > sk->sk_max_ack_backlog) | |
462 | wake_up_interruptible_all(&u->peer_wait); | |
463 | sk->sk_max_ack_backlog = backlog; | |
464 | sk->sk_state = TCP_LISTEN; | |
465 | /* set credentials so connect can copy them */ | |
b488893a | 466 | sk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
467 | sk->sk_peercred.uid = current->euid; |
468 | sk->sk_peercred.gid = current->egid; | |
469 | err = 0; | |
470 | ||
471 | out_unlock: | |
1c92b4e5 | 472 | unix_state_unlock(sk); |
1da177e4 LT |
473 | out: |
474 | return err; | |
475 | } | |
476 | ||
477 | static int unix_release(struct socket *); | |
478 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
479 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
480 | int addr_len, int flags); | |
481 | static int unix_socketpair(struct socket *, struct socket *); | |
482 | static int unix_accept(struct socket *, struct socket *, int); | |
483 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
484 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
485 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); | |
486 | static int unix_shutdown(struct socket *, int); | |
487 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
488 | struct msghdr *, size_t); | |
489 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
490 | struct msghdr *, size_t, int); | |
491 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
492 | struct msghdr *, size_t); | |
493 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
494 | struct msghdr *, size_t, int); | |
495 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
496 | int, int); | |
497 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
498 | struct msghdr *, size_t); | |
499 | ||
90ddc4f0 | 500 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
501 | .family = PF_UNIX, |
502 | .owner = THIS_MODULE, | |
503 | .release = unix_release, | |
504 | .bind = unix_bind, | |
505 | .connect = unix_stream_connect, | |
506 | .socketpair = unix_socketpair, | |
507 | .accept = unix_accept, | |
508 | .getname = unix_getname, | |
509 | .poll = unix_poll, | |
510 | .ioctl = unix_ioctl, | |
511 | .listen = unix_listen, | |
512 | .shutdown = unix_shutdown, | |
513 | .setsockopt = sock_no_setsockopt, | |
514 | .getsockopt = sock_no_getsockopt, | |
515 | .sendmsg = unix_stream_sendmsg, | |
516 | .recvmsg = unix_stream_recvmsg, | |
517 | .mmap = sock_no_mmap, | |
518 | .sendpage = sock_no_sendpage, | |
519 | }; | |
520 | ||
90ddc4f0 | 521 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
522 | .family = PF_UNIX, |
523 | .owner = THIS_MODULE, | |
524 | .release = unix_release, | |
525 | .bind = unix_bind, | |
526 | .connect = unix_dgram_connect, | |
527 | .socketpair = unix_socketpair, | |
528 | .accept = sock_no_accept, | |
529 | .getname = unix_getname, | |
530 | .poll = datagram_poll, | |
531 | .ioctl = unix_ioctl, | |
532 | .listen = sock_no_listen, | |
533 | .shutdown = unix_shutdown, | |
534 | .setsockopt = sock_no_setsockopt, | |
535 | .getsockopt = sock_no_getsockopt, | |
536 | .sendmsg = unix_dgram_sendmsg, | |
537 | .recvmsg = unix_dgram_recvmsg, | |
538 | .mmap = sock_no_mmap, | |
539 | .sendpage = sock_no_sendpage, | |
540 | }; | |
541 | ||
90ddc4f0 | 542 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
543 | .family = PF_UNIX, |
544 | .owner = THIS_MODULE, | |
545 | .release = unix_release, | |
546 | .bind = unix_bind, | |
547 | .connect = unix_stream_connect, | |
548 | .socketpair = unix_socketpair, | |
549 | .accept = unix_accept, | |
550 | .getname = unix_getname, | |
551 | .poll = datagram_poll, | |
552 | .ioctl = unix_ioctl, | |
553 | .listen = unix_listen, | |
554 | .shutdown = unix_shutdown, | |
555 | .setsockopt = sock_no_setsockopt, | |
556 | .getsockopt = sock_no_getsockopt, | |
557 | .sendmsg = unix_seqpacket_sendmsg, | |
558 | .recvmsg = unix_dgram_recvmsg, | |
559 | .mmap = sock_no_mmap, | |
560 | .sendpage = sock_no_sendpage, | |
561 | }; | |
562 | ||
563 | static struct proto unix_proto = { | |
564 | .name = "UNIX", | |
565 | .owner = THIS_MODULE, | |
566 | .obj_size = sizeof(struct unix_sock), | |
567 | }; | |
568 | ||
a09785a2 IM |
569 | /* |
570 | * AF_UNIX sockets do not interact with hardware, hence they | |
571 | * dont trigger interrupts - so it's safe for them to have | |
572 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
573 | * this special lock-class by reinitializing the spinlock key: | |
574 | */ | |
575 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
576 | ||
1b8d7ae4 | 577 | static struct sock * unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
578 | { |
579 | struct sock *sk = NULL; | |
580 | struct unix_sock *u; | |
581 | ||
284b327b PE |
582 | atomic_inc(&unix_nr_socks); |
583 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
584 | goto out; |
585 | ||
6257ff21 | 586 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
587 | if (!sk) |
588 | goto out; | |
589 | ||
1da177e4 | 590 | sock_init_data(sock,sk); |
a09785a2 IM |
591 | lockdep_set_class(&sk->sk_receive_queue.lock, |
592 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
593 | |
594 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 595 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
596 | sk->sk_destruct = unix_sock_destructor; |
597 | u = unix_sk(sk); | |
598 | u->dentry = NULL; | |
599 | u->mnt = NULL; | |
fd19f329 | 600 | spin_lock_init(&u->lock); |
1fd05ba5 MS |
601 | atomic_set(&u->inflight, 0); |
602 | INIT_LIST_HEAD(&u->link); | |
57b47a53 | 603 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 LT |
604 | init_waitqueue_head(&u->peer_wait); |
605 | unix_insert_socket(unix_sockets_unbound, sk); | |
606 | out: | |
284b327b PE |
607 | if (sk == NULL) |
608 | atomic_dec(&unix_nr_socks); | |
1da177e4 LT |
609 | return sk; |
610 | } | |
611 | ||
1b8d7ae4 | 612 | static int unix_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
613 | { |
614 | if (protocol && protocol != PF_UNIX) | |
615 | return -EPROTONOSUPPORT; | |
616 | ||
617 | sock->state = SS_UNCONNECTED; | |
618 | ||
619 | switch (sock->type) { | |
620 | case SOCK_STREAM: | |
621 | sock->ops = &unix_stream_ops; | |
622 | break; | |
623 | /* | |
624 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
625 | * nothing uses it. | |
626 | */ | |
627 | case SOCK_RAW: | |
628 | sock->type=SOCK_DGRAM; | |
629 | case SOCK_DGRAM: | |
630 | sock->ops = &unix_dgram_ops; | |
631 | break; | |
632 | case SOCK_SEQPACKET: | |
633 | sock->ops = &unix_seqpacket_ops; | |
634 | break; | |
635 | default: | |
636 | return -ESOCKTNOSUPPORT; | |
637 | } | |
638 | ||
1b8d7ae4 | 639 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
640 | } |
641 | ||
642 | static int unix_release(struct socket *sock) | |
643 | { | |
644 | struct sock *sk = sock->sk; | |
645 | ||
646 | if (!sk) | |
647 | return 0; | |
648 | ||
649 | sock->sk = NULL; | |
650 | ||
651 | return unix_release_sock (sk, 0); | |
652 | } | |
653 | ||
654 | static int unix_autobind(struct socket *sock) | |
655 | { | |
656 | struct sock *sk = sock->sk; | |
3b1e0a65 | 657 | struct net *net = sock_net(sk); |
1da177e4 LT |
658 | struct unix_sock *u = unix_sk(sk); |
659 | static u32 ordernum = 1; | |
660 | struct unix_address * addr; | |
661 | int err; | |
662 | ||
57b47a53 | 663 | mutex_lock(&u->readlock); |
1da177e4 LT |
664 | |
665 | err = 0; | |
666 | if (u->addr) | |
667 | goto out; | |
668 | ||
669 | err = -ENOMEM; | |
0da974f4 | 670 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
671 | if (!addr) |
672 | goto out; | |
673 | ||
1da177e4 LT |
674 | addr->name->sun_family = AF_UNIX; |
675 | atomic_set(&addr->refcnt, 1); | |
676 | ||
677 | retry: | |
678 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
679 | addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0)); | |
680 | ||
fbe9cc4a | 681 | spin_lock(&unix_table_lock); |
1da177e4 LT |
682 | ordernum = (ordernum+1)&0xFFFFF; |
683 | ||
097e66c5 | 684 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 685 | addr->hash)) { |
fbe9cc4a | 686 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
687 | /* Sanity yield. It is unusual case, but yet... */ |
688 | if (!(ordernum&0xFF)) | |
689 | yield(); | |
690 | goto retry; | |
691 | } | |
692 | addr->hash ^= sk->sk_type; | |
693 | ||
694 | __unix_remove_socket(sk); | |
695 | u->addr = addr; | |
696 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 697 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
698 | err = 0; |
699 | ||
57b47a53 | 700 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
701 | return err; |
702 | } | |
703 | ||
097e66c5 DL |
704 | static struct sock *unix_find_other(struct net *net, |
705 | struct sockaddr_un *sunname, int len, | |
1da177e4 LT |
706 | int type, unsigned hash, int *error) |
707 | { | |
708 | struct sock *u; | |
709 | struct nameidata nd; | |
710 | int err = 0; | |
ac7bfa62 | 711 | |
1da177e4 LT |
712 | if (sunname->sun_path[0]) { |
713 | err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd); | |
714 | if (err) | |
715 | goto fail; | |
e4543edd | 716 | err = vfs_permission(&nd, MAY_WRITE); |
1da177e4 LT |
717 | if (err) |
718 | goto put_fail; | |
719 | ||
720 | err = -ECONNREFUSED; | |
4ac91378 | 721 | if (!S_ISSOCK(nd.path.dentry->d_inode->i_mode)) |
1da177e4 | 722 | goto put_fail; |
4ac91378 | 723 | u = unix_find_socket_byinode(net, nd.path.dentry->d_inode); |
1da177e4 LT |
724 | if (!u) |
725 | goto put_fail; | |
726 | ||
727 | if (u->sk_type == type) | |
4ac91378 | 728 | touch_atime(nd.path.mnt, nd.path.dentry); |
1da177e4 | 729 | |
1d957f9b | 730 | path_put(&nd.path); |
1da177e4 LT |
731 | |
732 | err=-EPROTOTYPE; | |
733 | if (u->sk_type != type) { | |
734 | sock_put(u); | |
735 | goto fail; | |
736 | } | |
737 | } else { | |
738 | err = -ECONNREFUSED; | |
097e66c5 | 739 | u=unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
740 | if (u) { |
741 | struct dentry *dentry; | |
742 | dentry = unix_sk(u)->dentry; | |
743 | if (dentry) | |
744 | touch_atime(unix_sk(u)->mnt, dentry); | |
745 | } else | |
746 | goto fail; | |
747 | } | |
748 | return u; | |
749 | ||
750 | put_fail: | |
1d957f9b | 751 | path_put(&nd.path); |
1da177e4 LT |
752 | fail: |
753 | *error=err; | |
754 | return NULL; | |
755 | } | |
756 | ||
757 | ||
758 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
759 | { | |
760 | struct sock *sk = sock->sk; | |
3b1e0a65 | 761 | struct net *net = sock_net(sk); |
1da177e4 LT |
762 | struct unix_sock *u = unix_sk(sk); |
763 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
764 | struct dentry * dentry = NULL; | |
765 | struct nameidata nd; | |
766 | int err; | |
767 | unsigned hash; | |
768 | struct unix_address *addr; | |
769 | struct hlist_head *list; | |
770 | ||
771 | err = -EINVAL; | |
772 | if (sunaddr->sun_family != AF_UNIX) | |
773 | goto out; | |
774 | ||
775 | if (addr_len==sizeof(short)) { | |
776 | err = unix_autobind(sock); | |
777 | goto out; | |
778 | } | |
779 | ||
780 | err = unix_mkname(sunaddr, addr_len, &hash); | |
781 | if (err < 0) | |
782 | goto out; | |
783 | addr_len = err; | |
784 | ||
57b47a53 | 785 | mutex_lock(&u->readlock); |
1da177e4 LT |
786 | |
787 | err = -EINVAL; | |
788 | if (u->addr) | |
789 | goto out_up; | |
790 | ||
791 | err = -ENOMEM; | |
792 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
793 | if (!addr) | |
794 | goto out_up; | |
795 | ||
796 | memcpy(addr->name, sunaddr, addr_len); | |
797 | addr->len = addr_len; | |
798 | addr->hash = hash ^ sk->sk_type; | |
799 | atomic_set(&addr->refcnt, 1); | |
800 | ||
801 | if (sunaddr->sun_path[0]) { | |
802 | unsigned int mode; | |
803 | err = 0; | |
804 | /* | |
805 | * Get the parent directory, calculate the hash for last | |
806 | * component. | |
807 | */ | |
808 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); | |
809 | if (err) | |
810 | goto out_mknod_parent; | |
f81a0bff CH |
811 | |
812 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
813 | err = PTR_ERR(dentry); |
814 | if (IS_ERR(dentry)) | |
815 | goto out_mknod_unlock; | |
f81a0bff | 816 | |
1da177e4 LT |
817 | /* |
818 | * All right, let's create it. | |
819 | */ | |
820 | mode = S_IFSOCK | | |
821 | (SOCK_INODE(sock)->i_mode & ~current->fs->umask); | |
4ac91378 | 822 | err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0); |
1da177e4 LT |
823 | if (err) |
824 | goto out_mknod_dput; | |
4ac91378 JB |
825 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
826 | dput(nd.path.dentry); | |
827 | nd.path.dentry = dentry; | |
1da177e4 LT |
828 | |
829 | addr->hash = UNIX_HASH_SIZE; | |
830 | } | |
831 | ||
fbe9cc4a | 832 | spin_lock(&unix_table_lock); |
1da177e4 LT |
833 | |
834 | if (!sunaddr->sun_path[0]) { | |
835 | err = -EADDRINUSE; | |
097e66c5 | 836 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
837 | sk->sk_type, hash)) { |
838 | unix_release_addr(addr); | |
839 | goto out_unlock; | |
840 | } | |
841 | ||
842 | list = &unix_socket_table[addr->hash]; | |
843 | } else { | |
844 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; | |
4ac91378 JB |
845 | u->dentry = nd.path.dentry; |
846 | u->mnt = nd.path.mnt; | |
1da177e4 LT |
847 | } |
848 | ||
849 | err = 0; | |
850 | __unix_remove_socket(sk); | |
851 | u->addr = addr; | |
852 | __unix_insert_socket(list, sk); | |
853 | ||
854 | out_unlock: | |
fbe9cc4a | 855 | spin_unlock(&unix_table_lock); |
1da177e4 | 856 | out_up: |
57b47a53 | 857 | mutex_unlock(&u->readlock); |
1da177e4 LT |
858 | out: |
859 | return err; | |
860 | ||
861 | out_mknod_dput: | |
862 | dput(dentry); | |
863 | out_mknod_unlock: | |
4ac91378 | 864 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9b | 865 | path_put(&nd.path); |
1da177e4 LT |
866 | out_mknod_parent: |
867 | if (err==-EEXIST) | |
868 | err=-EADDRINUSE; | |
869 | unix_release_addr(addr); | |
870 | goto out_up; | |
871 | } | |
872 | ||
278a3de5 DM |
873 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
874 | { | |
875 | if (unlikely(sk1 == sk2) || !sk2) { | |
876 | unix_state_lock(sk1); | |
877 | return; | |
878 | } | |
879 | if (sk1 < sk2) { | |
880 | unix_state_lock(sk1); | |
881 | unix_state_lock_nested(sk2); | |
882 | } else { | |
883 | unix_state_lock(sk2); | |
884 | unix_state_lock_nested(sk1); | |
885 | } | |
886 | } | |
887 | ||
888 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
889 | { | |
890 | if (unlikely(sk1 == sk2) || !sk2) { | |
891 | unix_state_unlock(sk1); | |
892 | return; | |
893 | } | |
894 | unix_state_unlock(sk1); | |
895 | unix_state_unlock(sk2); | |
896 | } | |
897 | ||
1da177e4 LT |
898 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
899 | int alen, int flags) | |
900 | { | |
901 | struct sock *sk = sock->sk; | |
3b1e0a65 | 902 | struct net *net = sock_net(sk); |
1da177e4 LT |
903 | struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr; |
904 | struct sock *other; | |
905 | unsigned hash; | |
906 | int err; | |
907 | ||
908 | if (addr->sa_family != AF_UNSPEC) { | |
909 | err = unix_mkname(sunaddr, alen, &hash); | |
910 | if (err < 0) | |
911 | goto out; | |
912 | alen = err; | |
913 | ||
914 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
915 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
916 | goto out; | |
917 | ||
278a3de5 | 918 | restart: |
097e66c5 | 919 | other=unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
920 | if (!other) |
921 | goto out; | |
922 | ||
278a3de5 DM |
923 | unix_state_double_lock(sk, other); |
924 | ||
925 | /* Apparently VFS overslept socket death. Retry. */ | |
926 | if (sock_flag(other, SOCK_DEAD)) { | |
927 | unix_state_double_unlock(sk, other); | |
928 | sock_put(other); | |
929 | goto restart; | |
930 | } | |
1da177e4 LT |
931 | |
932 | err = -EPERM; | |
933 | if (!unix_may_send(sk, other)) | |
934 | goto out_unlock; | |
935 | ||
936 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
937 | if (err) | |
938 | goto out_unlock; | |
939 | ||
940 | } else { | |
941 | /* | |
942 | * 1003.1g breaking connected state with AF_UNSPEC | |
943 | */ | |
944 | other = NULL; | |
278a3de5 | 945 | unix_state_double_lock(sk, other); |
1da177e4 LT |
946 | } |
947 | ||
948 | /* | |
949 | * If it was connected, reconnect. | |
950 | */ | |
951 | if (unix_peer(sk)) { | |
952 | struct sock *old_peer = unix_peer(sk); | |
953 | unix_peer(sk)=other; | |
278a3de5 | 954 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
955 | |
956 | if (other != old_peer) | |
957 | unix_dgram_disconnected(sk, old_peer); | |
958 | sock_put(old_peer); | |
959 | } else { | |
960 | unix_peer(sk)=other; | |
278a3de5 | 961 | unix_state_double_unlock(sk, other); |
1da177e4 | 962 | } |
ac7bfa62 | 963 | return 0; |
1da177e4 LT |
964 | |
965 | out_unlock: | |
278a3de5 | 966 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
967 | sock_put(other); |
968 | out: | |
969 | return err; | |
970 | } | |
971 | ||
972 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
973 | { | |
974 | struct unix_sock *u = unix_sk(other); | |
975 | int sched; | |
976 | DEFINE_WAIT(wait); | |
977 | ||
978 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
979 | ||
980 | sched = !sock_flag(other, SOCK_DEAD) && | |
981 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
64a14651 | 982 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
983 | other->sk_max_ack_backlog); |
984 | ||
1c92b4e5 | 985 | unix_state_unlock(other); |
1da177e4 LT |
986 | |
987 | if (sched) | |
988 | timeo = schedule_timeout(timeo); | |
989 | ||
990 | finish_wait(&u->peer_wait, &wait); | |
991 | return timeo; | |
992 | } | |
993 | ||
994 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
995 | int addr_len, int flags) | |
996 | { | |
997 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
998 | struct sock *sk = sock->sk; | |
3b1e0a65 | 999 | struct net *net = sock_net(sk); |
1da177e4 LT |
1000 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1001 | struct sock *newsk = NULL; | |
1002 | struct sock *other = NULL; | |
1003 | struct sk_buff *skb = NULL; | |
1004 | unsigned hash; | |
1005 | int st; | |
1006 | int err; | |
1007 | long timeo; | |
1008 | ||
1009 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1010 | if (err < 0) | |
1011 | goto out; | |
1012 | addr_len = err; | |
1013 | ||
1014 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1015 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1016 | goto out; | |
1017 | ||
1018 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1019 | ||
1020 | /* First of all allocate resources. | |
1021 | If we will make it after state is locked, | |
1022 | we will have to recheck all again in any case. | |
1023 | */ | |
1024 | ||
1025 | err = -ENOMEM; | |
1026 | ||
1027 | /* create new sock for complete connection */ | |
3b1e0a65 | 1028 | newsk = unix_create1(sock_net(sk), NULL); |
1da177e4 LT |
1029 | if (newsk == NULL) |
1030 | goto out; | |
1031 | ||
1032 | /* Allocate skb for sending to listening sock */ | |
1033 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1034 | if (skb == NULL) | |
1035 | goto out; | |
1036 | ||
1037 | restart: | |
1038 | /* Find listening sock. */ | |
097e66c5 | 1039 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1040 | if (!other) |
1041 | goto out; | |
1042 | ||
1043 | /* Latch state of peer */ | |
1c92b4e5 | 1044 | unix_state_lock(other); |
1da177e4 LT |
1045 | |
1046 | /* Apparently VFS overslept socket death. Retry. */ | |
1047 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1048 | unix_state_unlock(other); |
1da177e4 LT |
1049 | sock_put(other); |
1050 | goto restart; | |
1051 | } | |
1052 | ||
1053 | err = -ECONNREFUSED; | |
1054 | if (other->sk_state != TCP_LISTEN) | |
1055 | goto out_unlock; | |
1056 | ||
64a14651 | 1057 | if (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1058 | other->sk_max_ack_backlog) { |
1059 | err = -EAGAIN; | |
1060 | if (!timeo) | |
1061 | goto out_unlock; | |
1062 | ||
1063 | timeo = unix_wait_for_peer(other, timeo); | |
1064 | ||
1065 | err = sock_intr_errno(timeo); | |
1066 | if (signal_pending(current)) | |
1067 | goto out; | |
1068 | sock_put(other); | |
1069 | goto restart; | |
ac7bfa62 | 1070 | } |
1da177e4 LT |
1071 | |
1072 | /* Latch our state. | |
1073 | ||
1074 | It is tricky place. We need to grab write lock and cannot | |
1075 | drop lock on peer. It is dangerous because deadlock is | |
1076 | possible. Connect to self case and simultaneous | |
1077 | attempt to connect are eliminated by checking socket | |
1078 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1079 | check this before attempt to grab lock. | |
1080 | ||
1081 | Well, and we have to recheck the state after socket locked. | |
1082 | */ | |
1083 | st = sk->sk_state; | |
1084 | ||
1085 | switch (st) { | |
1086 | case TCP_CLOSE: | |
1087 | /* This is ok... continue with connect */ | |
1088 | break; | |
1089 | case TCP_ESTABLISHED: | |
1090 | /* Socket is already connected */ | |
1091 | err = -EISCONN; | |
1092 | goto out_unlock; | |
1093 | default: | |
1094 | err = -EINVAL; | |
1095 | goto out_unlock; | |
1096 | } | |
1097 | ||
1c92b4e5 | 1098 | unix_state_lock_nested(sk); |
1da177e4 LT |
1099 | |
1100 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1101 | unix_state_unlock(sk); |
1102 | unix_state_unlock(other); | |
1da177e4 LT |
1103 | sock_put(other); |
1104 | goto restart; | |
1105 | } | |
1106 | ||
1107 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1108 | if (err) { | |
1c92b4e5 | 1109 | unix_state_unlock(sk); |
1da177e4 LT |
1110 | goto out_unlock; |
1111 | } | |
1112 | ||
1113 | /* The way is open! Fastly set all the necessary fields... */ | |
1114 | ||
1115 | sock_hold(sk); | |
1116 | unix_peer(newsk) = sk; | |
1117 | newsk->sk_state = TCP_ESTABLISHED; | |
1118 | newsk->sk_type = sk->sk_type; | |
b488893a | 1119 | newsk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1120 | newsk->sk_peercred.uid = current->euid; |
1121 | newsk->sk_peercred.gid = current->egid; | |
1122 | newu = unix_sk(newsk); | |
1123 | newsk->sk_sleep = &newu->peer_wait; | |
1124 | otheru = unix_sk(other); | |
1125 | ||
1126 | /* copy address information from listening to new sock*/ | |
1127 | if (otheru->addr) { | |
1128 | atomic_inc(&otheru->addr->refcnt); | |
1129 | newu->addr = otheru->addr; | |
1130 | } | |
1131 | if (otheru->dentry) { | |
1132 | newu->dentry = dget(otheru->dentry); | |
1133 | newu->mnt = mntget(otheru->mnt); | |
1134 | } | |
1135 | ||
1136 | /* Set credentials */ | |
1137 | sk->sk_peercred = other->sk_peercred; | |
1138 | ||
1da177e4 LT |
1139 | sock->state = SS_CONNECTED; |
1140 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1141 | sock_hold(newsk); |
1142 | ||
1143 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1144 | unix_peer(sk) = newsk; | |
1da177e4 | 1145 | |
1c92b4e5 | 1146 | unix_state_unlock(sk); |
1da177e4 LT |
1147 | |
1148 | /* take ten and and send info to listening sock */ | |
1149 | spin_lock(&other->sk_receive_queue.lock); | |
1150 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1151 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1152 | unix_state_unlock(other); |
1da177e4 LT |
1153 | other->sk_data_ready(other, 0); |
1154 | sock_put(other); | |
1155 | return 0; | |
1156 | ||
1157 | out_unlock: | |
1158 | if (other) | |
1c92b4e5 | 1159 | unix_state_unlock(other); |
1da177e4 LT |
1160 | |
1161 | out: | |
1162 | if (skb) | |
1163 | kfree_skb(skb); | |
1164 | if (newsk) | |
1165 | unix_release_sock(newsk, 0); | |
1166 | if (other) | |
1167 | sock_put(other); | |
1168 | return err; | |
1169 | } | |
1170 | ||
1171 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1172 | { | |
1173 | struct sock *ska=socka->sk, *skb = sockb->sk; | |
1174 | ||
1175 | /* Join our sockets back to back */ | |
1176 | sock_hold(ska); | |
1177 | sock_hold(skb); | |
1178 | unix_peer(ska)=skb; | |
1179 | unix_peer(skb)=ska; | |
b488893a | 1180 | ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1181 | ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid; |
1182 | ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid; | |
1183 | ||
1184 | if (ska->sk_type != SOCK_DGRAM) { | |
1185 | ska->sk_state = TCP_ESTABLISHED; | |
1186 | skb->sk_state = TCP_ESTABLISHED; | |
1187 | socka->state = SS_CONNECTED; | |
1188 | sockb->state = SS_CONNECTED; | |
1189 | } | |
1190 | return 0; | |
1191 | } | |
1192 | ||
1193 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) | |
1194 | { | |
1195 | struct sock *sk = sock->sk; | |
1196 | struct sock *tsk; | |
1197 | struct sk_buff *skb; | |
1198 | int err; | |
1199 | ||
1200 | err = -EOPNOTSUPP; | |
1201 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
1202 | goto out; | |
1203 | ||
1204 | err = -EINVAL; | |
1205 | if (sk->sk_state != TCP_LISTEN) | |
1206 | goto out; | |
1207 | ||
1208 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1209 | * so that no locks are necessary. | |
1210 | */ | |
1211 | ||
1212 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1213 | if (!skb) { | |
1214 | /* This means receive shutdown. */ | |
1215 | if (err == 0) | |
1216 | err = -EINVAL; | |
1217 | goto out; | |
1218 | } | |
1219 | ||
1220 | tsk = skb->sk; | |
1221 | skb_free_datagram(sk, skb); | |
1222 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1223 | ||
1224 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1225 | unix_state_lock(tsk); |
1da177e4 LT |
1226 | newsock->state = SS_CONNECTED; |
1227 | sock_graft(tsk, newsock); | |
1c92b4e5 | 1228 | unix_state_unlock(tsk); |
1da177e4 LT |
1229 | return 0; |
1230 | ||
1231 | out: | |
1232 | return err; | |
1233 | } | |
1234 | ||
1235 | ||
1236 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1237 | { | |
1238 | struct sock *sk = sock->sk; | |
1239 | struct unix_sock *u; | |
1240 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
1241 | int err = 0; | |
1242 | ||
1243 | if (peer) { | |
1244 | sk = unix_peer_get(sk); | |
1245 | ||
1246 | err = -ENOTCONN; | |
1247 | if (!sk) | |
1248 | goto out; | |
1249 | err = 0; | |
1250 | } else { | |
1251 | sock_hold(sk); | |
1252 | } | |
1253 | ||
1254 | u = unix_sk(sk); | |
1c92b4e5 | 1255 | unix_state_lock(sk); |
1da177e4 LT |
1256 | if (!u->addr) { |
1257 | sunaddr->sun_family = AF_UNIX; | |
1258 | sunaddr->sun_path[0] = 0; | |
1259 | *uaddr_len = sizeof(short); | |
1260 | } else { | |
1261 | struct unix_address *addr = u->addr; | |
1262 | ||
1263 | *uaddr_len = addr->len; | |
1264 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1265 | } | |
1c92b4e5 | 1266 | unix_state_unlock(sk); |
1da177e4 LT |
1267 | sock_put(sk); |
1268 | out: | |
1269 | return err; | |
1270 | } | |
1271 | ||
1272 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1273 | { | |
1274 | int i; | |
1275 | ||
1276 | scm->fp = UNIXCB(skb).fp; | |
1277 | skb->destructor = sock_wfree; | |
1278 | UNIXCB(skb).fp = NULL; | |
1279 | ||
1280 | for (i=scm->fp->count-1; i>=0; i--) | |
1281 | unix_notinflight(scm->fp->fp[i]); | |
1282 | } | |
1283 | ||
1284 | static void unix_destruct_fds(struct sk_buff *skb) | |
1285 | { | |
1286 | struct scm_cookie scm; | |
1287 | memset(&scm, 0, sizeof(scm)); | |
1288 | unix_detach_fds(&scm, skb); | |
1289 | ||
1290 | /* Alas, it calls VFS */ | |
1291 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1292 | scm_destroy(&scm); | |
1293 | sock_wfree(skb); | |
1294 | } | |
1295 | ||
1296 | static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1297 | { | |
1298 | int i; | |
1299 | for (i=scm->fp->count-1; i>=0; i--) | |
1300 | unix_inflight(scm->fp->fp[i]); | |
1301 | UNIXCB(skb).fp = scm->fp; | |
1302 | skb->destructor = unix_destruct_fds; | |
1303 | scm->fp = NULL; | |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * Send AF_UNIX data. | |
1308 | */ | |
1309 | ||
1310 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1311 | struct msghdr *msg, size_t len) | |
1312 | { | |
1313 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1314 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1315 | struct net *net = sock_net(sk); |
1da177e4 LT |
1316 | struct unix_sock *u = unix_sk(sk); |
1317 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1318 | struct sock *other = NULL; | |
1319 | int namelen = 0; /* fake GCC */ | |
1320 | int err; | |
1321 | unsigned hash; | |
1322 | struct sk_buff *skb; | |
1323 | long timeo; | |
1324 | struct scm_cookie tmp_scm; | |
1325 | ||
1326 | if (NULL == siocb->scm) | |
1327 | siocb->scm = &tmp_scm; | |
1328 | err = scm_send(sock, msg, siocb->scm); | |
1329 | if (err < 0) | |
1330 | return err; | |
1331 | ||
1332 | err = -EOPNOTSUPP; | |
1333 | if (msg->msg_flags&MSG_OOB) | |
1334 | goto out; | |
1335 | ||
1336 | if (msg->msg_namelen) { | |
1337 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1338 | if (err < 0) | |
1339 | goto out; | |
1340 | namelen = err; | |
1341 | } else { | |
1342 | sunaddr = NULL; | |
1343 | err = -ENOTCONN; | |
1344 | other = unix_peer_get(sk); | |
1345 | if (!other) | |
1346 | goto out; | |
1347 | } | |
1348 | ||
1349 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1350 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1351 | goto out; | |
1352 | ||
1353 | err = -EMSGSIZE; | |
1354 | if (len > sk->sk_sndbuf - 32) | |
1355 | goto out; | |
1356 | ||
1357 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); | |
1358 | if (skb==NULL) | |
1359 | goto out; | |
1360 | ||
1361 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1362 | if (siocb->scm->fp) | |
1363 | unix_attach_fds(siocb->scm, skb); | |
dc49c1f9 | 1364 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1365 | |
badff6d0 | 1366 | skb_reset_transport_header(skb); |
1da177e4 LT |
1367 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
1368 | if (err) | |
1369 | goto out_free; | |
1370 | ||
1371 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1372 | ||
1373 | restart: | |
1374 | if (!other) { | |
1375 | err = -ECONNRESET; | |
1376 | if (sunaddr == NULL) | |
1377 | goto out_free; | |
1378 | ||
097e66c5 | 1379 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 LT |
1380 | hash, &err); |
1381 | if (other==NULL) | |
1382 | goto out_free; | |
1383 | } | |
1384 | ||
1c92b4e5 | 1385 | unix_state_lock(other); |
1da177e4 LT |
1386 | err = -EPERM; |
1387 | if (!unix_may_send(sk, other)) | |
1388 | goto out_unlock; | |
1389 | ||
1390 | if (sock_flag(other, SOCK_DEAD)) { | |
1391 | /* | |
1392 | * Check with 1003.1g - what should | |
1393 | * datagram error | |
1394 | */ | |
1c92b4e5 | 1395 | unix_state_unlock(other); |
1da177e4 LT |
1396 | sock_put(other); |
1397 | ||
1398 | err = 0; | |
1c92b4e5 | 1399 | unix_state_lock(sk); |
1da177e4 LT |
1400 | if (unix_peer(sk) == other) { |
1401 | unix_peer(sk)=NULL; | |
1c92b4e5 | 1402 | unix_state_unlock(sk); |
1da177e4 LT |
1403 | |
1404 | unix_dgram_disconnected(sk, other); | |
1405 | sock_put(other); | |
1406 | err = -ECONNREFUSED; | |
1407 | } else { | |
1c92b4e5 | 1408 | unix_state_unlock(sk); |
1da177e4 LT |
1409 | } |
1410 | ||
1411 | other = NULL; | |
1412 | if (err) | |
1413 | goto out_free; | |
1414 | goto restart; | |
1415 | } | |
1416 | ||
1417 | err = -EPIPE; | |
1418 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1419 | goto out_unlock; | |
1420 | ||
1421 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1422 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1423 | if (err) | |
1424 | goto out_unlock; | |
1425 | } | |
1426 | ||
1427 | if (unix_peer(other) != sk && | |
64a14651 | 1428 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1429 | other->sk_max_ack_backlog)) { |
1430 | if (!timeo) { | |
1431 | err = -EAGAIN; | |
1432 | goto out_unlock; | |
1433 | } | |
1434 | ||
1435 | timeo = unix_wait_for_peer(other, timeo); | |
1436 | ||
1437 | err = sock_intr_errno(timeo); | |
1438 | if (signal_pending(current)) | |
1439 | goto out_free; | |
1440 | ||
1441 | goto restart; | |
1442 | } | |
1443 | ||
1444 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1445 | unix_state_unlock(other); |
1da177e4 LT |
1446 | other->sk_data_ready(other, len); |
1447 | sock_put(other); | |
1448 | scm_destroy(siocb->scm); | |
1449 | return len; | |
1450 | ||
1451 | out_unlock: | |
1c92b4e5 | 1452 | unix_state_unlock(other); |
1da177e4 LT |
1453 | out_free: |
1454 | kfree_skb(skb); | |
1455 | out: | |
1456 | if (other) | |
1457 | sock_put(other); | |
1458 | scm_destroy(siocb->scm); | |
1459 | return err; | |
1460 | } | |
1461 | ||
ac7bfa62 | 1462 | |
1da177e4 LT |
1463 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
1464 | struct msghdr *msg, size_t len) | |
1465 | { | |
1466 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1467 | struct sock *sk = sock->sk; | |
1468 | struct sock *other = NULL; | |
1469 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1470 | int err,size; | |
1471 | struct sk_buff *skb; | |
1472 | int sent=0; | |
1473 | struct scm_cookie tmp_scm; | |
1474 | ||
1475 | if (NULL == siocb->scm) | |
1476 | siocb->scm = &tmp_scm; | |
1477 | err = scm_send(sock, msg, siocb->scm); | |
1478 | if (err < 0) | |
1479 | return err; | |
1480 | ||
1481 | err = -EOPNOTSUPP; | |
1482 | if (msg->msg_flags&MSG_OOB) | |
1483 | goto out_err; | |
1484 | ||
1485 | if (msg->msg_namelen) { | |
1486 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1487 | goto out_err; | |
1488 | } else { | |
1489 | sunaddr = NULL; | |
1490 | err = -ENOTCONN; | |
830a1e5c | 1491 | other = unix_peer(sk); |
1da177e4 LT |
1492 | if (!other) |
1493 | goto out_err; | |
1494 | } | |
1495 | ||
1496 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1497 | goto pipe_err; | |
1498 | ||
1499 | while(sent < len) | |
1500 | { | |
1501 | /* | |
e9df7d7f BL |
1502 | * Optimisation for the fact that under 0.01% of X |
1503 | * messages typically need breaking up. | |
1da177e4 LT |
1504 | */ |
1505 | ||
e9df7d7f | 1506 | size = len-sent; |
1da177e4 LT |
1507 | |
1508 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1509 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1510 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1511 | |
1512 | if (size > SKB_MAX_ALLOC) | |
1513 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1514 | |
1da177e4 LT |
1515 | /* |
1516 | * Grab a buffer | |
1517 | */ | |
ac7bfa62 | 1518 | |
1da177e4 LT |
1519 | skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err); |
1520 | ||
1521 | if (skb==NULL) | |
1522 | goto out_err; | |
1523 | ||
1524 | /* | |
1525 | * If you pass two values to the sock_alloc_send_skb | |
1526 | * it tries to grab the large buffer with GFP_NOFS | |
1527 | * (which can fail easily), and if it fails grab the | |
1528 | * fallback size buffer which is under a page and will | |
1529 | * succeed. [Alan] | |
1530 | */ | |
1531 | size = min_t(int, size, skb_tailroom(skb)); | |
1532 | ||
1533 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1534 | if (siocb->scm->fp) | |
1535 | unix_attach_fds(siocb->scm, skb); | |
1536 | ||
1537 | if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) { | |
1538 | kfree_skb(skb); | |
1539 | goto out_err; | |
1540 | } | |
1541 | ||
1c92b4e5 | 1542 | unix_state_lock(other); |
1da177e4 LT |
1543 | |
1544 | if (sock_flag(other, SOCK_DEAD) || | |
1545 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1546 | goto pipe_err_free; | |
1547 | ||
1548 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1549 | unix_state_unlock(other); |
1da177e4 LT |
1550 | other->sk_data_ready(other, size); |
1551 | sent+=size; | |
1552 | } | |
1da177e4 LT |
1553 | |
1554 | scm_destroy(siocb->scm); | |
1555 | siocb->scm = NULL; | |
1556 | ||
1557 | return sent; | |
1558 | ||
1559 | pipe_err_free: | |
1c92b4e5 | 1560 | unix_state_unlock(other); |
1da177e4 LT |
1561 | kfree_skb(skb); |
1562 | pipe_err: | |
1563 | if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
1564 | send_sig(SIGPIPE,current,0); | |
1565 | err = -EPIPE; | |
1566 | out_err: | |
1da177e4 LT |
1567 | scm_destroy(siocb->scm); |
1568 | siocb->scm = NULL; | |
1569 | return sent ? : err; | |
1570 | } | |
1571 | ||
1572 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1573 | struct msghdr *msg, size_t len) | |
1574 | { | |
1575 | int err; | |
1576 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1577 | |
1da177e4 LT |
1578 | err = sock_error(sk); |
1579 | if (err) | |
1580 | return err; | |
1581 | ||
1582 | if (sk->sk_state != TCP_ESTABLISHED) | |
1583 | return -ENOTCONN; | |
1584 | ||
1585 | if (msg->msg_namelen) | |
1586 | msg->msg_namelen = 0; | |
1587 | ||
1588 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
1589 | } | |
ac7bfa62 | 1590 | |
1da177e4 LT |
1591 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
1592 | { | |
1593 | struct unix_sock *u = unix_sk(sk); | |
1594 | ||
1595 | msg->msg_namelen = 0; | |
1596 | if (u->addr) { | |
1597 | msg->msg_namelen = u->addr->len; | |
1598 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1603 | struct msghdr *msg, size_t size, | |
1604 | int flags) | |
1605 | { | |
1606 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1607 | struct scm_cookie tmp_scm; | |
1608 | struct sock *sk = sock->sk; | |
1609 | struct unix_sock *u = unix_sk(sk); | |
1610 | int noblock = flags & MSG_DONTWAIT; | |
1611 | struct sk_buff *skb; | |
1612 | int err; | |
1613 | ||
1614 | err = -EOPNOTSUPP; | |
1615 | if (flags&MSG_OOB) | |
1616 | goto out; | |
1617 | ||
1618 | msg->msg_namelen = 0; | |
1619 | ||
57b47a53 | 1620 | mutex_lock(&u->readlock); |
1da177e4 LT |
1621 | |
1622 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
0a112258 FZ |
1623 | if (!skb) { |
1624 | unix_state_lock(sk); | |
1625 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
1626 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
1627 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1628 | err = 0; | |
1629 | unix_state_unlock(sk); | |
1da177e4 | 1630 | goto out_unlock; |
0a112258 | 1631 | } |
1da177e4 | 1632 | |
71e20f18 | 1633 | wake_up_interruptible_sync(&u->peer_wait); |
1da177e4 LT |
1634 | |
1635 | if (msg->msg_name) | |
1636 | unix_copy_addr(msg, skb->sk); | |
1637 | ||
1638 | if (size > skb->len) | |
1639 | size = skb->len; | |
1640 | else if (size < skb->len) | |
1641 | msg->msg_flags |= MSG_TRUNC; | |
1642 | ||
1643 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); | |
1644 | if (err) | |
1645 | goto out_free; | |
1646 | ||
1647 | if (!siocb->scm) { | |
1648 | siocb->scm = &tmp_scm; | |
1649 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1650 | } | |
1651 | siocb->scm->creds = *UNIXCREDS(skb); | |
877ce7c1 | 1652 | unix_set_secdata(siocb->scm, skb); |
1da177e4 LT |
1653 | |
1654 | if (!(flags & MSG_PEEK)) | |
1655 | { | |
1656 | if (UNIXCB(skb).fp) | |
1657 | unix_detach_fds(siocb->scm, skb); | |
1658 | } | |
ac7bfa62 | 1659 | else |
1da177e4 LT |
1660 | { |
1661 | /* It is questionable: on PEEK we could: | |
1662 | - do not return fds - good, but too simple 8) | |
1663 | - return fds, and do not return them on read (old strategy, | |
1664 | apparently wrong) | |
1665 | - clone fds (I chose it for now, it is the most universal | |
1666 | solution) | |
ac7bfa62 YH |
1667 | |
1668 | POSIX 1003.1g does not actually define this clearly | |
1669 | at all. POSIX 1003.1g doesn't define a lot of things | |
1670 | clearly however! | |
1671 | ||
1da177e4 LT |
1672 | */ |
1673 | if (UNIXCB(skb).fp) | |
1674 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1675 | } | |
1676 | err = size; | |
1677 | ||
1678 | scm_recv(sock, msg, siocb->scm, flags); | |
1679 | ||
1680 | out_free: | |
1681 | skb_free_datagram(sk,skb); | |
1682 | out_unlock: | |
57b47a53 | 1683 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1684 | out: |
1685 | return err; | |
1686 | } | |
1687 | ||
1688 | /* | |
1689 | * Sleep until data has arrive. But check for races.. | |
1690 | */ | |
ac7bfa62 | 1691 | |
1da177e4 LT |
1692 | static long unix_stream_data_wait(struct sock * sk, long timeo) |
1693 | { | |
1694 | DEFINE_WAIT(wait); | |
1695 | ||
1c92b4e5 | 1696 | unix_state_lock(sk); |
1da177e4 LT |
1697 | |
1698 | for (;;) { | |
1699 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1700 | ||
b03efcfb | 1701 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
1702 | sk->sk_err || |
1703 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1704 | signal_pending(current) || | |
1705 | !timeo) | |
1706 | break; | |
1707 | ||
1708 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 1709 | unix_state_unlock(sk); |
1da177e4 | 1710 | timeo = schedule_timeout(timeo); |
1c92b4e5 | 1711 | unix_state_lock(sk); |
1da177e4 LT |
1712 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1713 | } | |
1714 | ||
1715 | finish_wait(sk->sk_sleep, &wait); | |
1c92b4e5 | 1716 | unix_state_unlock(sk); |
1da177e4 LT |
1717 | return timeo; |
1718 | } | |
1719 | ||
1720 | ||
1721 | ||
1722 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1723 | struct msghdr *msg, size_t size, | |
1724 | int flags) | |
1725 | { | |
1726 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1727 | struct scm_cookie tmp_scm; | |
1728 | struct sock *sk = sock->sk; | |
1729 | struct unix_sock *u = unix_sk(sk); | |
1730 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1731 | int copied = 0; | |
1732 | int check_creds = 0; | |
1733 | int target; | |
1734 | int err = 0; | |
1735 | long timeo; | |
1736 | ||
1737 | err = -EINVAL; | |
1738 | if (sk->sk_state != TCP_ESTABLISHED) | |
1739 | goto out; | |
1740 | ||
1741 | err = -EOPNOTSUPP; | |
1742 | if (flags&MSG_OOB) | |
1743 | goto out; | |
1744 | ||
1745 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
1746 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
1747 | ||
1748 | msg->msg_namelen = 0; | |
1749 | ||
1750 | /* Lock the socket to prevent queue disordering | |
1751 | * while sleeps in memcpy_tomsg | |
1752 | */ | |
1753 | ||
1754 | if (!siocb->scm) { | |
1755 | siocb->scm = &tmp_scm; | |
1756 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1757 | } | |
1758 | ||
57b47a53 | 1759 | mutex_lock(&u->readlock); |
1da177e4 LT |
1760 | |
1761 | do | |
1762 | { | |
1763 | int chunk; | |
1764 | struct sk_buff *skb; | |
1765 | ||
3c0d2f37 | 1766 | unix_state_lock(sk); |
1da177e4 LT |
1767 | skb = skb_dequeue(&sk->sk_receive_queue); |
1768 | if (skb==NULL) | |
1769 | { | |
1770 | if (copied >= target) | |
3c0d2f37 | 1771 | goto unlock; |
1da177e4 LT |
1772 | |
1773 | /* | |
1774 | * POSIX 1003.1g mandates this order. | |
1775 | */ | |
ac7bfa62 | 1776 | |
1da177e4 | 1777 | if ((err = sock_error(sk)) != 0) |
3c0d2f37 | 1778 | goto unlock; |
1da177e4 | 1779 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
1780 | goto unlock; |
1781 | ||
1782 | unix_state_unlock(sk); | |
1da177e4 LT |
1783 | err = -EAGAIN; |
1784 | if (!timeo) | |
1785 | break; | |
57b47a53 | 1786 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1787 | |
1788 | timeo = unix_stream_data_wait(sk, timeo); | |
1789 | ||
1790 | if (signal_pending(current)) { | |
1791 | err = sock_intr_errno(timeo); | |
1792 | goto out; | |
1793 | } | |
57b47a53 | 1794 | mutex_lock(&u->readlock); |
1da177e4 | 1795 | continue; |
3c0d2f37 MS |
1796 | unlock: |
1797 | unix_state_unlock(sk); | |
1798 | break; | |
1da177e4 | 1799 | } |
3c0d2f37 | 1800 | unix_state_unlock(sk); |
1da177e4 LT |
1801 | |
1802 | if (check_creds) { | |
1803 | /* Never glue messages from different writers */ | |
1804 | if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) { | |
1805 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1806 | break; | |
1807 | } | |
1808 | } else { | |
1809 | /* Copy credentials */ | |
1810 | siocb->scm->creds = *UNIXCREDS(skb); | |
1811 | check_creds = 1; | |
1812 | } | |
1813 | ||
1814 | /* Copy address just once */ | |
1815 | if (sunaddr) | |
1816 | { | |
1817 | unix_copy_addr(msg, skb->sk); | |
1818 | sunaddr = NULL; | |
1819 | } | |
1820 | ||
1821 | chunk = min_t(unsigned int, skb->len, size); | |
1822 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
1823 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1824 | if (copied == 0) | |
1825 | copied = -EFAULT; | |
1826 | break; | |
1827 | } | |
1828 | copied += chunk; | |
1829 | size -= chunk; | |
1830 | ||
1831 | /* Mark read part of skb as used */ | |
1832 | if (!(flags & MSG_PEEK)) | |
1833 | { | |
1834 | skb_pull(skb, chunk); | |
1835 | ||
1836 | if (UNIXCB(skb).fp) | |
1837 | unix_detach_fds(siocb->scm, skb); | |
1838 | ||
1839 | /* put the skb back if we didn't use it up.. */ | |
1840 | if (skb->len) | |
1841 | { | |
1842 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1843 | break; | |
1844 | } | |
1845 | ||
1846 | kfree_skb(skb); | |
1847 | ||
1848 | if (siocb->scm->fp) | |
1849 | break; | |
1850 | } | |
1851 | else | |
1852 | { | |
1853 | /* It is questionable, see note in unix_dgram_recvmsg. | |
1854 | */ | |
1855 | if (UNIXCB(skb).fp) | |
1856 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1857 | ||
1858 | /* put message back and return */ | |
1859 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1860 | break; | |
1861 | } | |
1862 | } while (size); | |
1863 | ||
57b47a53 | 1864 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1865 | scm_recv(sock, msg, siocb->scm, flags); |
1866 | out: | |
1867 | return copied ? : err; | |
1868 | } | |
1869 | ||
1870 | static int unix_shutdown(struct socket *sock, int mode) | |
1871 | { | |
1872 | struct sock *sk = sock->sk; | |
1873 | struct sock *other; | |
1874 | ||
1875 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); | |
1876 | ||
1877 | if (mode) { | |
1c92b4e5 | 1878 | unix_state_lock(sk); |
1da177e4 LT |
1879 | sk->sk_shutdown |= mode; |
1880 | other=unix_peer(sk); | |
1881 | if (other) | |
1882 | sock_hold(other); | |
1c92b4e5 | 1883 | unix_state_unlock(sk); |
1da177e4 LT |
1884 | sk->sk_state_change(sk); |
1885 | ||
1886 | if (other && | |
1887 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
1888 | ||
1889 | int peer_mode = 0; | |
1890 | ||
1891 | if (mode&RCV_SHUTDOWN) | |
1892 | peer_mode |= SEND_SHUTDOWN; | |
1893 | if (mode&SEND_SHUTDOWN) | |
1894 | peer_mode |= RCV_SHUTDOWN; | |
1c92b4e5 | 1895 | unix_state_lock(other); |
1da177e4 | 1896 | other->sk_shutdown |= peer_mode; |
1c92b4e5 | 1897 | unix_state_unlock(other); |
1da177e4 LT |
1898 | other->sk_state_change(other); |
1899 | read_lock(&other->sk_callback_lock); | |
1900 | if (peer_mode == SHUTDOWN_MASK) | |
8d8ad9d7 | 1901 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 | 1902 | else if (peer_mode & RCV_SHUTDOWN) |
8d8ad9d7 | 1903 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1904 | read_unlock(&other->sk_callback_lock); |
1905 | } | |
1906 | if (other) | |
1907 | sock_put(other); | |
1908 | } | |
1909 | return 0; | |
1910 | } | |
1911 | ||
1912 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1913 | { | |
1914 | struct sock *sk = sock->sk; | |
1915 | long amount=0; | |
1916 | int err; | |
1917 | ||
1918 | switch(cmd) | |
1919 | { | |
1920 | case SIOCOUTQ: | |
1921 | amount = atomic_read(&sk->sk_wmem_alloc); | |
1922 | err = put_user(amount, (int __user *)arg); | |
1923 | break; | |
1924 | case SIOCINQ: | |
1925 | { | |
1926 | struct sk_buff *skb; | |
1927 | ||
1928 | if (sk->sk_state == TCP_LISTEN) { | |
1929 | err = -EINVAL; | |
1930 | break; | |
1931 | } | |
1932 | ||
1933 | spin_lock(&sk->sk_receive_queue.lock); | |
1934 | if (sk->sk_type == SOCK_STREAM || | |
1935 | sk->sk_type == SOCK_SEQPACKET) { | |
1936 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
1937 | amount += skb->len; | |
1938 | } else { | |
1939 | skb = skb_peek(&sk->sk_receive_queue); | |
1940 | if (skb) | |
1941 | amount=skb->len; | |
1942 | } | |
1943 | spin_unlock(&sk->sk_receive_queue.lock); | |
1944 | err = put_user(amount, (int __user *)arg); | |
1945 | break; | |
1946 | } | |
1947 | ||
1948 | default: | |
b5e5fa5e | 1949 | err = -ENOIOCTLCMD; |
1da177e4 LT |
1950 | break; |
1951 | } | |
1952 | return err; | |
1953 | } | |
1954 | ||
1955 | static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait) | |
1956 | { | |
1957 | struct sock *sk = sock->sk; | |
1958 | unsigned int mask; | |
1959 | ||
1960 | poll_wait(file, sk->sk_sleep, wait); | |
1961 | mask = 0; | |
1962 | ||
1963 | /* exceptional events? */ | |
1964 | if (sk->sk_err) | |
1965 | mask |= POLLERR; | |
1966 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1967 | mask |= POLLHUP; | |
f348d70a DL |
1968 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1969 | mask |= POLLRDHUP; | |
1da177e4 LT |
1970 | |
1971 | /* readable? */ | |
1972 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1973 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1974 | mask |= POLLIN | POLLRDNORM; | |
1975 | ||
1976 | /* Connection-based need to check for termination and startup */ | |
1977 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE) | |
1978 | mask |= POLLHUP; | |
1979 | ||
1980 | /* | |
1981 | * we set writable also when the other side has shut down the | |
1982 | * connection. This prevents stuck sockets. | |
1983 | */ | |
1984 | if (unix_writable(sk)) | |
1985 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1986 | ||
1987 | return mask; | |
1988 | } | |
1989 | ||
1990 | ||
1991 | #ifdef CONFIG_PROC_FS | |
a53eb3fe PE |
1992 | static struct sock *first_unix_socket(int *i) |
1993 | { | |
1994 | for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { | |
1995 | if (!hlist_empty(&unix_socket_table[*i])) | |
1996 | return __sk_head(&unix_socket_table[*i]); | |
1997 | } | |
1998 | return NULL; | |
1999 | } | |
2000 | ||
2001 | static struct sock *next_unix_socket(int *i, struct sock *s) | |
2002 | { | |
2003 | struct sock *next = sk_next(s); | |
2004 | /* More in this chain? */ | |
2005 | if (next) | |
2006 | return next; | |
2007 | /* Look for next non-empty chain. */ | |
2008 | for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2009 | if (!hlist_empty(&unix_socket_table[*i])) | |
2010 | return __sk_head(&unix_socket_table[*i]); | |
2011 | } | |
2012 | return NULL; | |
2013 | } | |
2014 | ||
097e66c5 | 2015 | struct unix_iter_state { |
e372c414 | 2016 | struct seq_net_private p; |
097e66c5 DL |
2017 | int i; |
2018 | }; | |
1218854a | 2019 | static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 2020 | { |
1218854a | 2021 | struct unix_iter_state *iter = seq->private; |
1da177e4 LT |
2022 | loff_t off = 0; |
2023 | struct sock *s; | |
2024 | ||
097e66c5 | 2025 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
1218854a | 2026 | if (sock_net(s) != seq_file_net(seq)) |
097e66c5 | 2027 | continue; |
ac7bfa62 | 2028 | if (off == pos) |
1da177e4 LT |
2029 | return s; |
2030 | ++off; | |
2031 | } | |
2032 | return NULL; | |
2033 | } | |
2034 | ||
2035 | ||
2036 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) | |
9a429c49 | 2037 | __acquires(unix_table_lock) |
1da177e4 | 2038 | { |
fbe9cc4a | 2039 | spin_lock(&unix_table_lock); |
b9f3124f | 2040 | return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2041 | } |
2042 | ||
2043 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2044 | { | |
097e66c5 DL |
2045 | struct unix_iter_state *iter = seq->private; |
2046 | struct sock *sk = v; | |
1da177e4 LT |
2047 | ++*pos; |
2048 | ||
b9f3124f | 2049 | if (v == SEQ_START_TOKEN) |
097e66c5 DL |
2050 | sk = first_unix_socket(&iter->i); |
2051 | else | |
2052 | sk = next_unix_socket(&iter->i, sk); | |
1218854a | 2053 | while (sk && (sock_net(sk) != seq_file_net(seq))) |
097e66c5 DL |
2054 | sk = next_unix_socket(&iter->i, sk); |
2055 | return sk; | |
1da177e4 LT |
2056 | } |
2057 | ||
2058 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2059 | __releases(unix_table_lock) |
1da177e4 | 2060 | { |
fbe9cc4a | 2061 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2062 | } |
2063 | ||
2064 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2065 | { | |
ac7bfa62 | 2066 | |
b9f3124f | 2067 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2068 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2069 | "Inode Path\n"); | |
2070 | else { | |
2071 | struct sock *s = v; | |
2072 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2073 | unix_state_lock(s); |
1da177e4 LT |
2074 | |
2075 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", | |
2076 | s, | |
2077 | atomic_read(&s->sk_refcnt), | |
2078 | 0, | |
2079 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2080 | s->sk_type, | |
2081 | s->sk_socket ? | |
2082 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2083 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2084 | sock_i_ino(s)); | |
2085 | ||
2086 | if (u->addr) { | |
2087 | int i, len; | |
2088 | seq_putc(seq, ' '); | |
2089 | ||
2090 | i = 0; | |
2091 | len = u->addr->len - sizeof(short); | |
2092 | if (!UNIX_ABSTRACT(s)) | |
2093 | len--; | |
2094 | else { | |
2095 | seq_putc(seq, '@'); | |
2096 | i++; | |
2097 | } | |
2098 | for ( ; i < len; i++) | |
2099 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2100 | } | |
1c92b4e5 | 2101 | unix_state_unlock(s); |
1da177e4 LT |
2102 | seq_putc(seq, '\n'); |
2103 | } | |
2104 | ||
2105 | return 0; | |
2106 | } | |
2107 | ||
56b3d975 | 2108 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2109 | .start = unix_seq_start, |
2110 | .next = unix_seq_next, | |
2111 | .stop = unix_seq_stop, | |
2112 | .show = unix_seq_show, | |
2113 | }; | |
2114 | ||
2115 | ||
2116 | static int unix_seq_open(struct inode *inode, struct file *file) | |
2117 | { | |
e372c414 DL |
2118 | return seq_open_net(inode, file, &unix_seq_ops, |
2119 | sizeof(struct unix_iter_state)); | |
1da177e4 LT |
2120 | } |
2121 | ||
da7071d7 | 2122 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2123 | .owner = THIS_MODULE, |
2124 | .open = unix_seq_open, | |
2125 | .read = seq_read, | |
2126 | .llseek = seq_lseek, | |
e372c414 | 2127 | .release = seq_release_net, |
1da177e4 LT |
2128 | }; |
2129 | ||
2130 | #endif | |
2131 | ||
2132 | static struct net_proto_family unix_family_ops = { | |
2133 | .family = PF_UNIX, | |
2134 | .create = unix_create, | |
2135 | .owner = THIS_MODULE, | |
2136 | }; | |
2137 | ||
097e66c5 DL |
2138 | |
2139 | static int unix_net_init(struct net *net) | |
2140 | { | |
2141 | int error = -ENOMEM; | |
2142 | ||
a0a53c8b | 2143 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2144 | if (unix_sysctl_register(net)) |
2145 | goto out; | |
d392e497 | 2146 | |
097e66c5 | 2147 | #ifdef CONFIG_PROC_FS |
1597fbc0 PE |
2148 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) { |
2149 | unix_sysctl_unregister(net); | |
097e66c5 | 2150 | goto out; |
1597fbc0 | 2151 | } |
097e66c5 DL |
2152 | #endif |
2153 | error = 0; | |
2154 | out: | |
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | static void unix_net_exit(struct net *net) | |
2159 | { | |
1597fbc0 | 2160 | unix_sysctl_unregister(net); |
097e66c5 DL |
2161 | proc_net_remove(net, "unix"); |
2162 | } | |
2163 | ||
2164 | static struct pernet_operations unix_net_ops = { | |
2165 | .init = unix_net_init, | |
2166 | .exit = unix_net_exit, | |
2167 | }; | |
2168 | ||
1da177e4 LT |
2169 | static int __init af_unix_init(void) |
2170 | { | |
2171 | int rc = -1; | |
2172 | struct sk_buff *dummy_skb; | |
2173 | ||
ef047f5e | 2174 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
2175 | |
2176 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2177 | if (rc != 0) { |
2178 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
0dc47877 | 2179 | __func__); |
1da177e4 LT |
2180 | goto out; |
2181 | } | |
2182 | ||
2183 | sock_register(&unix_family_ops); | |
097e66c5 | 2184 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2185 | out: |
2186 | return rc; | |
2187 | } | |
2188 | ||
2189 | static void __exit af_unix_exit(void) | |
2190 | { | |
2191 | sock_unregister(PF_UNIX); | |
1da177e4 | 2192 | proto_unregister(&unix_proto); |
097e66c5 | 2193 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2194 | } |
2195 | ||
2196 | module_init(af_unix_init); | |
2197 | module_exit(af_unix_exit); | |
2198 | ||
2199 | MODULE_LICENSE("GPL"); | |
2200 | MODULE_ALIAS_NETPROTO(PF_UNIX); |