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 | * | |
1da177e4 LT |
11 | * Fixes: |
12 | * Linus Torvalds : Assorted bug cures. | |
13 | * Niibe Yutaka : async I/O support. | |
14 | * Carsten Paeth : PF_UNIX check, address fixes. | |
15 | * Alan Cox : Limit size of allocated blocks. | |
16 | * Alan Cox : Fixed the stupid socketpair bug. | |
17 | * Alan Cox : BSD compatibility fine tuning. | |
18 | * Alan Cox : Fixed a bug in connect when interrupted. | |
19 | * Alan Cox : Sorted out a proper draft version of | |
20 | * file descriptor passing hacked up from | |
21 | * Mike Shaver's work. | |
22 | * Marty Leisner : Fixes to fd passing | |
23 | * Nick Nevin : recvmsg bugfix. | |
24 | * Alan Cox : Started proper garbage collector | |
25 | * Heiko EiBfeldt : Missing verify_area check | |
26 | * Alan Cox : Started POSIXisms | |
27 | * Andreas Schwab : Replace inode by dentry for proper | |
28 | * reference counting | |
29 | * Kirk Petersen : Made this a module | |
30 | * Christoph Rohland : Elegant non-blocking accept/connect algorithm. | |
31 | * Lots of bug fixes. | |
32 | * Alexey Kuznetosv : Repaired (I hope) bugs introduces | |
33 | * by above two patches. | |
34 | * Andrea Arcangeli : If possible we block in connect(2) | |
35 | * if the max backlog of the listen socket | |
36 | * is been reached. This won't break | |
37 | * old apps and it will avoid huge amount | |
38 | * of socks hashed (this for unix_gc() | |
39 | * performances reasons). | |
40 | * Security fix that limits the max | |
41 | * number of socks to 2*max_files and | |
42 | * the number of skb queueable in the | |
43 | * dgram receiver. | |
44 | * Artur Skawina : Hash function optimizations | |
45 | * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8) | |
46 | * Malcolm Beattie : Set peercred for socketpair | |
47 | * Michal Ostrowski : Module initialization cleanup. | |
48 | * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT, | |
49 | * the core infrastructure is doing that | |
50 | * for all net proto families now (2.5.69+) | |
51 | * | |
52 | * | |
53 | * Known differences from reference BSD that was tested: | |
54 | * | |
55 | * [TO FIX] | |
56 | * ECONNREFUSED is not returned from one end of a connected() socket to the | |
57 | * other the moment one end closes. | |
58 | * fstat() doesn't return st_dev=0, and give the blksize as high water mark | |
59 | * and a fake inode identifier (nor the BSD first socket fstat twice bug). | |
60 | * [NOT TO FIX] | |
61 | * accept() returns a path name even if the connecting socket has closed | |
62 | * in the meantime (BSD loses the path and gives up). | |
63 | * accept() returns 0 length path for an unbound connector. BSD returns 16 | |
64 | * and a null first byte in the path (but not for gethost/peername - BSD bug ??) | |
65 | * socketpair(...SOCK_RAW..) doesn't panic the kernel. | |
66 | * BSD af_unix apparently has connect forgetting to block properly. | |
67 | * (need to check this with the POSIX spec in detail) | |
68 | * | |
69 | * Differences from 2.0.0-11-... (ANK) | |
70 | * Bug fixes and improvements. | |
71 | * - client shutdown killed server socket. | |
72 | * - removed all useless cli/sti pairs. | |
73 | * | |
74 | * Semantic changes/extensions. | |
75 | * - generic control message passing. | |
76 | * - SCM_CREDENTIALS control message. | |
77 | * - "Abstract" (not FS based) socket bindings. | |
78 | * Abstract names are sequences of bytes (not zero terminated) | |
79 | * started by 0, so that this name space does not intersect | |
80 | * with BSD names. | |
81 | */ | |
82 | ||
83 | #include <linux/module.h> | |
1da177e4 | 84 | #include <linux/kernel.h> |
1da177e4 LT |
85 | #include <linux/signal.h> |
86 | #include <linux/sched.h> | |
87 | #include <linux/errno.h> | |
88 | #include <linux/string.h> | |
89 | #include <linux/stat.h> | |
90 | #include <linux/dcache.h> | |
91 | #include <linux/namei.h> | |
92 | #include <linux/socket.h> | |
93 | #include <linux/un.h> | |
94 | #include <linux/fcntl.h> | |
95 | #include <linux/termios.h> | |
96 | #include <linux/sockios.h> | |
97 | #include <linux/net.h> | |
98 | #include <linux/in.h> | |
99 | #include <linux/fs.h> | |
100 | #include <linux/slab.h> | |
101 | #include <asm/uaccess.h> | |
102 | #include <linux/skbuff.h> | |
103 | #include <linux/netdevice.h> | |
457c4cbc | 104 | #include <net/net_namespace.h> |
1da177e4 | 105 | #include <net/sock.h> |
c752f073 | 106 | #include <net/tcp_states.h> |
1da177e4 LT |
107 | #include <net/af_unix.h> |
108 | #include <linux/proc_fs.h> | |
109 | #include <linux/seq_file.h> | |
110 | #include <net/scm.h> | |
111 | #include <linux/init.h> | |
112 | #include <linux/poll.h> | |
1da177e4 LT |
113 | #include <linux/rtnetlink.h> |
114 | #include <linux/mount.h> | |
115 | #include <net/checksum.h> | |
116 | #include <linux/security.h> | |
117 | ||
13111698 AB |
118 | static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; |
119 | static DEFINE_SPINLOCK(unix_table_lock); | |
1da177e4 LT |
120 | static atomic_t unix_nr_socks = ATOMIC_INIT(0); |
121 | ||
122 | #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) | |
123 | ||
124 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE) | |
125 | ||
877ce7c1 | 126 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 127 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 128 | { |
dc49c1f9 | 129 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
877ce7c1 CZ |
130 | } |
131 | ||
132 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
133 | { | |
dc49c1f9 | 134 | scm->secid = *UNIXSID(skb); |
877ce7c1 CZ |
135 | } |
136 | #else | |
dc49c1f9 | 137 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
138 | { } |
139 | ||
140 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
141 | { } | |
142 | #endif /* CONFIG_SECURITY_NETWORK */ | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * SMP locking strategy: | |
fbe9cc4a | 146 | * hash table is protected with spinlock unix_table_lock |
1da177e4 LT |
147 | * each socket state is protected by separate rwlock. |
148 | */ | |
149 | ||
44bb9363 | 150 | static inline unsigned unix_hash_fold(__wsum n) |
1da177e4 | 151 | { |
44bb9363 | 152 | unsigned hash = (__force unsigned)n; |
1da177e4 LT |
153 | hash ^= hash>>16; |
154 | hash ^= hash>>8; | |
155 | return hash&(UNIX_HASH_SIZE-1); | |
156 | } | |
157 | ||
158 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
159 | ||
160 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
161 | { | |
162 | return unix_peer(osk) == sk; | |
163 | } | |
164 | ||
165 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
166 | { | |
167 | return (unix_peer(osk) == NULL || unix_our_peer(sk, osk)); | |
168 | } | |
169 | ||
170 | static struct sock *unix_peer_get(struct sock *s) | |
171 | { | |
172 | struct sock *peer; | |
173 | ||
1c92b4e5 | 174 | unix_state_lock(s); |
1da177e4 LT |
175 | peer = unix_peer(s); |
176 | if (peer) | |
177 | sock_hold(peer); | |
1c92b4e5 | 178 | unix_state_unlock(s); |
1da177e4 LT |
179 | return peer; |
180 | } | |
181 | ||
182 | static inline void unix_release_addr(struct unix_address *addr) | |
183 | { | |
184 | if (atomic_dec_and_test(&addr->refcnt)) | |
185 | kfree(addr); | |
186 | } | |
187 | ||
188 | /* | |
189 | * Check unix socket name: | |
190 | * - should be not zero length. | |
191 | * - if started by not zero, should be NULL terminated (FS object) | |
192 | * - if started by zero, it is abstract name. | |
193 | */ | |
ac7bfa62 | 194 | |
1da177e4 LT |
195 | static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp) |
196 | { | |
197 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
198 | return -EINVAL; | |
199 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
200 | return -EINVAL; | |
201 | if (sunaddr->sun_path[0]) { | |
202 | /* | |
203 | * This may look like an off by one error but it is a bit more | |
204 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
205 | * sun_path[108] doesnt as such exist. However in kernel space | |
206 | * we are guaranteed that it is a valid memory location in our | |
207 | * kernel address buffer. | |
208 | */ | |
209 | ((char *)sunaddr)[len]=0; | |
210 | len = strlen(sunaddr->sun_path)+1+sizeof(short); | |
211 | return len; | |
212 | } | |
213 | ||
214 | *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0)); | |
215 | return len; | |
216 | } | |
217 | ||
218 | static void __unix_remove_socket(struct sock *sk) | |
219 | { | |
220 | sk_del_node_init(sk); | |
221 | } | |
222 | ||
223 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
224 | { | |
225 | BUG_TRAP(sk_unhashed(sk)); | |
226 | sk_add_node(sk, list); | |
227 | } | |
228 | ||
229 | static inline void unix_remove_socket(struct sock *sk) | |
230 | { | |
fbe9cc4a | 231 | spin_lock(&unix_table_lock); |
1da177e4 | 232 | __unix_remove_socket(sk); |
fbe9cc4a | 233 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
234 | } |
235 | ||
236 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
237 | { | |
fbe9cc4a | 238 | spin_lock(&unix_table_lock); |
1da177e4 | 239 | __unix_insert_socket(list, sk); |
fbe9cc4a | 240 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
241 | } |
242 | ||
097e66c5 DL |
243 | static struct sock *__unix_find_socket_byname(struct net *net, |
244 | struct sockaddr_un *sunname, | |
1da177e4 LT |
245 | int len, int type, unsigned hash) |
246 | { | |
247 | struct sock *s; | |
248 | struct hlist_node *node; | |
249 | ||
250 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { | |
251 | struct unix_sock *u = unix_sk(s); | |
252 | ||
878628fb | 253 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
254 | continue; |
255 | ||
1da177e4 LT |
256 | if (u->addr->len == len && |
257 | !memcmp(u->addr->name, sunname, len)) | |
258 | goto found; | |
259 | } | |
260 | s = NULL; | |
261 | found: | |
262 | return s; | |
263 | } | |
264 | ||
097e66c5 DL |
265 | static inline struct sock *unix_find_socket_byname(struct net *net, |
266 | struct sockaddr_un *sunname, | |
1da177e4 LT |
267 | int len, int type, |
268 | unsigned hash) | |
269 | { | |
270 | struct sock *s; | |
271 | ||
fbe9cc4a | 272 | spin_lock(&unix_table_lock); |
097e66c5 | 273 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
274 | if (s) |
275 | sock_hold(s); | |
fbe9cc4a | 276 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
277 | return s; |
278 | } | |
279 | ||
097e66c5 | 280 | static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i) |
1da177e4 LT |
281 | { |
282 | struct sock *s; | |
283 | struct hlist_node *node; | |
284 | ||
fbe9cc4a | 285 | spin_lock(&unix_table_lock); |
1da177e4 LT |
286 | sk_for_each(s, node, |
287 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { | |
288 | struct dentry *dentry = unix_sk(s)->dentry; | |
289 | ||
878628fb | 290 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
291 | continue; |
292 | ||
1da177e4 LT |
293 | if(dentry && dentry->d_inode == i) |
294 | { | |
295 | sock_hold(s); | |
296 | goto found; | |
297 | } | |
298 | } | |
299 | s = NULL; | |
300 | found: | |
fbe9cc4a | 301 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
302 | return s; |
303 | } | |
304 | ||
305 | static inline int unix_writable(struct sock *sk) | |
306 | { | |
307 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
308 | } | |
309 | ||
310 | static void unix_write_space(struct sock *sk) | |
311 | { | |
312 | read_lock(&sk->sk_callback_lock); | |
313 | if (unix_writable(sk)) { | |
314 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
71e20f18 | 315 | wake_up_interruptible_sync(sk->sk_sleep); |
8d8ad9d7 | 316 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
317 | } |
318 | read_unlock(&sk->sk_callback_lock); | |
319 | } | |
320 | ||
321 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
322 | * queue of packets arrived from previous peer. First, it allows to do | |
323 | * flow control based only on wmem_alloc; second, sk connected to peer | |
324 | * may receive messages only from that peer. */ | |
325 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
326 | { | |
b03efcfb | 327 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
328 | skb_queue_purge(&sk->sk_receive_queue); |
329 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
330 | ||
331 | /* If one link of bidirectional dgram pipe is disconnected, | |
332 | * we signal error. Messages are lost. Do not make this, | |
333 | * when peer was not connected to us. | |
334 | */ | |
335 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
336 | other->sk_err = ECONNRESET; | |
337 | other->sk_error_report(other); | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
342 | static void unix_sock_destructor(struct sock *sk) | |
343 | { | |
344 | struct unix_sock *u = unix_sk(sk); | |
345 | ||
346 | skb_queue_purge(&sk->sk_receive_queue); | |
347 | ||
348 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
349 | BUG_TRAP(sk_unhashed(sk)); | |
350 | BUG_TRAP(!sk->sk_socket); | |
351 | if (!sock_flag(sk, SOCK_DEAD)) { | |
352 | printk("Attempt to release alive unix socket: %p\n", sk); | |
353 | return; | |
354 | } | |
355 | ||
356 | if (u->addr) | |
357 | unix_release_addr(u->addr); | |
358 | ||
359 | atomic_dec(&unix_nr_socks); | |
360 | #ifdef UNIX_REFCNT_DEBUG | |
361 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks)); | |
362 | #endif | |
363 | } | |
364 | ||
365 | static int unix_release_sock (struct sock *sk, int embrion) | |
366 | { | |
367 | struct unix_sock *u = unix_sk(sk); | |
368 | struct dentry *dentry; | |
369 | struct vfsmount *mnt; | |
370 | struct sock *skpair; | |
371 | struct sk_buff *skb; | |
372 | int state; | |
373 | ||
374 | unix_remove_socket(sk); | |
375 | ||
376 | /* Clear state */ | |
1c92b4e5 | 377 | unix_state_lock(sk); |
1da177e4 LT |
378 | sock_orphan(sk); |
379 | sk->sk_shutdown = SHUTDOWN_MASK; | |
380 | dentry = u->dentry; | |
381 | u->dentry = NULL; | |
382 | mnt = u->mnt; | |
383 | u->mnt = NULL; | |
384 | state = sk->sk_state; | |
385 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 386 | unix_state_unlock(sk); |
1da177e4 LT |
387 | |
388 | wake_up_interruptible_all(&u->peer_wait); | |
389 | ||
390 | skpair=unix_peer(sk); | |
391 | ||
392 | if (skpair!=NULL) { | |
393 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { | |
1c92b4e5 | 394 | unix_state_lock(skpair); |
1da177e4 LT |
395 | /* No more writes */ |
396 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
397 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
398 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 399 | unix_state_unlock(skpair); |
1da177e4 LT |
400 | skpair->sk_state_change(skpair); |
401 | read_lock(&skpair->sk_callback_lock); | |
8d8ad9d7 | 402 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 LT |
403 | read_unlock(&skpair->sk_callback_lock); |
404 | } | |
405 | sock_put(skpair); /* It may now die */ | |
406 | unix_peer(sk) = NULL; | |
407 | } | |
408 | ||
409 | /* Try to flush out this socket. Throw out buffers at least */ | |
410 | ||
411 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
412 | if (state==TCP_LISTEN) | |
413 | unix_release_sock(skb->sk, 1); | |
414 | /* passed fds are erased in the kfree_skb hook */ | |
415 | kfree_skb(skb); | |
416 | } | |
417 | ||
418 | if (dentry) { | |
419 | dput(dentry); | |
420 | mntput(mnt); | |
421 | } | |
422 | ||
423 | sock_put(sk); | |
424 | ||
425 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
426 | ||
427 | /* | |
428 | * Fixme: BSD difference: In BSD all sockets connected to use get | |
429 | * ECONNRESET and we die on the spot. In Linux we behave | |
430 | * like files and pipes do and wait for the last | |
431 | * dereference. | |
432 | * | |
433 | * Can't we simply set sock->err? | |
434 | * | |
435 | * What the above comment does talk about? --ANK(980817) | |
436 | */ | |
437 | ||
9305cfa4 | 438 | if (unix_tot_inflight) |
ac7bfa62 | 439 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
440 | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static int unix_listen(struct socket *sock, int backlog) | |
445 | { | |
446 | int err; | |
447 | struct sock *sk = sock->sk; | |
448 | struct unix_sock *u = unix_sk(sk); | |
449 | ||
450 | err = -EOPNOTSUPP; | |
451 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
452 | goto out; /* Only stream/seqpacket sockets accept */ | |
453 | err = -EINVAL; | |
454 | if (!u->addr) | |
455 | goto out; /* No listens on an unbound socket */ | |
1c92b4e5 | 456 | unix_state_lock(sk); |
1da177e4 LT |
457 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
458 | goto out_unlock; | |
459 | if (backlog > sk->sk_max_ack_backlog) | |
460 | wake_up_interruptible_all(&u->peer_wait); | |
461 | sk->sk_max_ack_backlog = backlog; | |
462 | sk->sk_state = TCP_LISTEN; | |
463 | /* set credentials so connect can copy them */ | |
b488893a | 464 | sk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
465 | sk->sk_peercred.uid = current->euid; |
466 | sk->sk_peercred.gid = current->egid; | |
467 | err = 0; | |
468 | ||
469 | out_unlock: | |
1c92b4e5 | 470 | unix_state_unlock(sk); |
1da177e4 LT |
471 | out: |
472 | return err; | |
473 | } | |
474 | ||
475 | static int unix_release(struct socket *); | |
476 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
477 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
478 | int addr_len, int flags); | |
479 | static int unix_socketpair(struct socket *, struct socket *); | |
480 | static int unix_accept(struct socket *, struct socket *, int); | |
481 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
482 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
483 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); | |
484 | static int unix_shutdown(struct socket *, int); | |
485 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
486 | struct msghdr *, size_t); | |
487 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
488 | struct msghdr *, size_t, int); | |
489 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
490 | struct msghdr *, size_t); | |
491 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
492 | struct msghdr *, size_t, int); | |
493 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
494 | int, int); | |
495 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
496 | struct msghdr *, size_t); | |
497 | ||
90ddc4f0 | 498 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
499 | .family = PF_UNIX, |
500 | .owner = THIS_MODULE, | |
501 | .release = unix_release, | |
502 | .bind = unix_bind, | |
503 | .connect = unix_stream_connect, | |
504 | .socketpair = unix_socketpair, | |
505 | .accept = unix_accept, | |
506 | .getname = unix_getname, | |
507 | .poll = unix_poll, | |
508 | .ioctl = unix_ioctl, | |
509 | .listen = unix_listen, | |
510 | .shutdown = unix_shutdown, | |
511 | .setsockopt = sock_no_setsockopt, | |
512 | .getsockopt = sock_no_getsockopt, | |
513 | .sendmsg = unix_stream_sendmsg, | |
514 | .recvmsg = unix_stream_recvmsg, | |
515 | .mmap = sock_no_mmap, | |
516 | .sendpage = sock_no_sendpage, | |
517 | }; | |
518 | ||
90ddc4f0 | 519 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
520 | .family = PF_UNIX, |
521 | .owner = THIS_MODULE, | |
522 | .release = unix_release, | |
523 | .bind = unix_bind, | |
524 | .connect = unix_dgram_connect, | |
525 | .socketpair = unix_socketpair, | |
526 | .accept = sock_no_accept, | |
527 | .getname = unix_getname, | |
528 | .poll = datagram_poll, | |
529 | .ioctl = unix_ioctl, | |
530 | .listen = sock_no_listen, | |
531 | .shutdown = unix_shutdown, | |
532 | .setsockopt = sock_no_setsockopt, | |
533 | .getsockopt = sock_no_getsockopt, | |
534 | .sendmsg = unix_dgram_sendmsg, | |
535 | .recvmsg = unix_dgram_recvmsg, | |
536 | .mmap = sock_no_mmap, | |
537 | .sendpage = sock_no_sendpage, | |
538 | }; | |
539 | ||
90ddc4f0 | 540 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
541 | .family = PF_UNIX, |
542 | .owner = THIS_MODULE, | |
543 | .release = unix_release, | |
544 | .bind = unix_bind, | |
545 | .connect = unix_stream_connect, | |
546 | .socketpair = unix_socketpair, | |
547 | .accept = unix_accept, | |
548 | .getname = unix_getname, | |
549 | .poll = datagram_poll, | |
550 | .ioctl = unix_ioctl, | |
551 | .listen = unix_listen, | |
552 | .shutdown = unix_shutdown, | |
553 | .setsockopt = sock_no_setsockopt, | |
554 | .getsockopt = sock_no_getsockopt, | |
555 | .sendmsg = unix_seqpacket_sendmsg, | |
556 | .recvmsg = unix_dgram_recvmsg, | |
557 | .mmap = sock_no_mmap, | |
558 | .sendpage = sock_no_sendpage, | |
559 | }; | |
560 | ||
561 | static struct proto unix_proto = { | |
562 | .name = "UNIX", | |
563 | .owner = THIS_MODULE, | |
564 | .obj_size = sizeof(struct unix_sock), | |
565 | }; | |
566 | ||
a09785a2 IM |
567 | /* |
568 | * AF_UNIX sockets do not interact with hardware, hence they | |
569 | * dont trigger interrupts - so it's safe for them to have | |
570 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
571 | * this special lock-class by reinitializing the spinlock key: | |
572 | */ | |
573 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
574 | ||
1b8d7ae4 | 575 | static struct sock * unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
576 | { |
577 | struct sock *sk = NULL; | |
578 | struct unix_sock *u; | |
579 | ||
284b327b PE |
580 | atomic_inc(&unix_nr_socks); |
581 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
582 | goto out; |
583 | ||
6257ff21 | 584 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
585 | if (!sk) |
586 | goto out; | |
587 | ||
1da177e4 | 588 | sock_init_data(sock,sk); |
a09785a2 IM |
589 | lockdep_set_class(&sk->sk_receive_queue.lock, |
590 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
591 | |
592 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 593 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
594 | sk->sk_destruct = unix_sock_destructor; |
595 | u = unix_sk(sk); | |
596 | u->dentry = NULL; | |
597 | u->mnt = NULL; | |
fd19f329 | 598 | spin_lock_init(&u->lock); |
1fd05ba5 MS |
599 | atomic_set(&u->inflight, 0); |
600 | INIT_LIST_HEAD(&u->link); | |
57b47a53 | 601 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 LT |
602 | init_waitqueue_head(&u->peer_wait); |
603 | unix_insert_socket(unix_sockets_unbound, sk); | |
604 | out: | |
284b327b PE |
605 | if (sk == NULL) |
606 | atomic_dec(&unix_nr_socks); | |
1da177e4 LT |
607 | return sk; |
608 | } | |
609 | ||
1b8d7ae4 | 610 | static int unix_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
611 | { |
612 | if (protocol && protocol != PF_UNIX) | |
613 | return -EPROTONOSUPPORT; | |
614 | ||
615 | sock->state = SS_UNCONNECTED; | |
616 | ||
617 | switch (sock->type) { | |
618 | case SOCK_STREAM: | |
619 | sock->ops = &unix_stream_ops; | |
620 | break; | |
621 | /* | |
622 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
623 | * nothing uses it. | |
624 | */ | |
625 | case SOCK_RAW: | |
626 | sock->type=SOCK_DGRAM; | |
627 | case SOCK_DGRAM: | |
628 | sock->ops = &unix_dgram_ops; | |
629 | break; | |
630 | case SOCK_SEQPACKET: | |
631 | sock->ops = &unix_seqpacket_ops; | |
632 | break; | |
633 | default: | |
634 | return -ESOCKTNOSUPPORT; | |
635 | } | |
636 | ||
1b8d7ae4 | 637 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
638 | } |
639 | ||
640 | static int unix_release(struct socket *sock) | |
641 | { | |
642 | struct sock *sk = sock->sk; | |
643 | ||
644 | if (!sk) | |
645 | return 0; | |
646 | ||
647 | sock->sk = NULL; | |
648 | ||
649 | return unix_release_sock (sk, 0); | |
650 | } | |
651 | ||
652 | static int unix_autobind(struct socket *sock) | |
653 | { | |
654 | struct sock *sk = sock->sk; | |
3b1e0a65 | 655 | struct net *net = sock_net(sk); |
1da177e4 LT |
656 | struct unix_sock *u = unix_sk(sk); |
657 | static u32 ordernum = 1; | |
658 | struct unix_address * addr; | |
659 | int err; | |
660 | ||
57b47a53 | 661 | mutex_lock(&u->readlock); |
1da177e4 LT |
662 | |
663 | err = 0; | |
664 | if (u->addr) | |
665 | goto out; | |
666 | ||
667 | err = -ENOMEM; | |
0da974f4 | 668 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
669 | if (!addr) |
670 | goto out; | |
671 | ||
1da177e4 LT |
672 | addr->name->sun_family = AF_UNIX; |
673 | atomic_set(&addr->refcnt, 1); | |
674 | ||
675 | retry: | |
676 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
677 | addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0)); | |
678 | ||
fbe9cc4a | 679 | spin_lock(&unix_table_lock); |
1da177e4 LT |
680 | ordernum = (ordernum+1)&0xFFFFF; |
681 | ||
097e66c5 | 682 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 683 | addr->hash)) { |
fbe9cc4a | 684 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
685 | /* Sanity yield. It is unusual case, but yet... */ |
686 | if (!(ordernum&0xFF)) | |
687 | yield(); | |
688 | goto retry; | |
689 | } | |
690 | addr->hash ^= sk->sk_type; | |
691 | ||
692 | __unix_remove_socket(sk); | |
693 | u->addr = addr; | |
694 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 695 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
696 | err = 0; |
697 | ||
57b47a53 | 698 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
699 | return err; |
700 | } | |
701 | ||
097e66c5 DL |
702 | static struct sock *unix_find_other(struct net *net, |
703 | struct sockaddr_un *sunname, int len, | |
1da177e4 LT |
704 | int type, unsigned hash, int *error) |
705 | { | |
706 | struct sock *u; | |
707 | struct nameidata nd; | |
708 | int err = 0; | |
ac7bfa62 | 709 | |
1da177e4 LT |
710 | if (sunname->sun_path[0]) { |
711 | err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd); | |
712 | if (err) | |
713 | goto fail; | |
e4543edd | 714 | err = vfs_permission(&nd, MAY_WRITE); |
1da177e4 LT |
715 | if (err) |
716 | goto put_fail; | |
717 | ||
718 | err = -ECONNREFUSED; | |
4ac91378 | 719 | if (!S_ISSOCK(nd.path.dentry->d_inode->i_mode)) |
1da177e4 | 720 | goto put_fail; |
4ac91378 | 721 | u = unix_find_socket_byinode(net, nd.path.dentry->d_inode); |
1da177e4 LT |
722 | if (!u) |
723 | goto put_fail; | |
724 | ||
725 | if (u->sk_type == type) | |
4ac91378 | 726 | touch_atime(nd.path.mnt, nd.path.dentry); |
1da177e4 | 727 | |
1d957f9b | 728 | path_put(&nd.path); |
1da177e4 LT |
729 | |
730 | err=-EPROTOTYPE; | |
731 | if (u->sk_type != type) { | |
732 | sock_put(u); | |
733 | goto fail; | |
734 | } | |
735 | } else { | |
736 | err = -ECONNREFUSED; | |
097e66c5 | 737 | u=unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
738 | if (u) { |
739 | struct dentry *dentry; | |
740 | dentry = unix_sk(u)->dentry; | |
741 | if (dentry) | |
742 | touch_atime(unix_sk(u)->mnt, dentry); | |
743 | } else | |
744 | goto fail; | |
745 | } | |
746 | return u; | |
747 | ||
748 | put_fail: | |
1d957f9b | 749 | path_put(&nd.path); |
1da177e4 LT |
750 | fail: |
751 | *error=err; | |
752 | return NULL; | |
753 | } | |
754 | ||
755 | ||
756 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
757 | { | |
758 | struct sock *sk = sock->sk; | |
3b1e0a65 | 759 | struct net *net = sock_net(sk); |
1da177e4 LT |
760 | struct unix_sock *u = unix_sk(sk); |
761 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
762 | struct dentry * dentry = NULL; | |
763 | struct nameidata nd; | |
764 | int err; | |
765 | unsigned hash; | |
766 | struct unix_address *addr; | |
767 | struct hlist_head *list; | |
768 | ||
769 | err = -EINVAL; | |
770 | if (sunaddr->sun_family != AF_UNIX) | |
771 | goto out; | |
772 | ||
773 | if (addr_len==sizeof(short)) { | |
774 | err = unix_autobind(sock); | |
775 | goto out; | |
776 | } | |
777 | ||
778 | err = unix_mkname(sunaddr, addr_len, &hash); | |
779 | if (err < 0) | |
780 | goto out; | |
781 | addr_len = err; | |
782 | ||
57b47a53 | 783 | mutex_lock(&u->readlock); |
1da177e4 LT |
784 | |
785 | err = -EINVAL; | |
786 | if (u->addr) | |
787 | goto out_up; | |
788 | ||
789 | err = -ENOMEM; | |
790 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
791 | if (!addr) | |
792 | goto out_up; | |
793 | ||
794 | memcpy(addr->name, sunaddr, addr_len); | |
795 | addr->len = addr_len; | |
796 | addr->hash = hash ^ sk->sk_type; | |
797 | atomic_set(&addr->refcnt, 1); | |
798 | ||
799 | if (sunaddr->sun_path[0]) { | |
800 | unsigned int mode; | |
801 | err = 0; | |
802 | /* | |
803 | * Get the parent directory, calculate the hash for last | |
804 | * component. | |
805 | */ | |
806 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); | |
807 | if (err) | |
808 | goto out_mknod_parent; | |
f81a0bff CH |
809 | |
810 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
811 | err = PTR_ERR(dentry); |
812 | if (IS_ERR(dentry)) | |
813 | goto out_mknod_unlock; | |
f81a0bff | 814 | |
1da177e4 LT |
815 | /* |
816 | * All right, let's create it. | |
817 | */ | |
818 | mode = S_IFSOCK | | |
819 | (SOCK_INODE(sock)->i_mode & ~current->fs->umask); | |
463c3197 DH |
820 | err = mnt_want_write(nd.path.mnt); |
821 | if (err) | |
822 | goto out_mknod_dput; | |
4ac91378 | 823 | err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0); |
463c3197 | 824 | mnt_drop_write(nd.path.mnt); |
1da177e4 LT |
825 | if (err) |
826 | goto out_mknod_dput; | |
4ac91378 JB |
827 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
828 | dput(nd.path.dentry); | |
829 | nd.path.dentry = dentry; | |
1da177e4 LT |
830 | |
831 | addr->hash = UNIX_HASH_SIZE; | |
832 | } | |
833 | ||
fbe9cc4a | 834 | spin_lock(&unix_table_lock); |
1da177e4 LT |
835 | |
836 | if (!sunaddr->sun_path[0]) { | |
837 | err = -EADDRINUSE; | |
097e66c5 | 838 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
839 | sk->sk_type, hash)) { |
840 | unix_release_addr(addr); | |
841 | goto out_unlock; | |
842 | } | |
843 | ||
844 | list = &unix_socket_table[addr->hash]; | |
845 | } else { | |
846 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; | |
4ac91378 JB |
847 | u->dentry = nd.path.dentry; |
848 | u->mnt = nd.path.mnt; | |
1da177e4 LT |
849 | } |
850 | ||
851 | err = 0; | |
852 | __unix_remove_socket(sk); | |
853 | u->addr = addr; | |
854 | __unix_insert_socket(list, sk); | |
855 | ||
856 | out_unlock: | |
fbe9cc4a | 857 | spin_unlock(&unix_table_lock); |
1da177e4 | 858 | out_up: |
57b47a53 | 859 | mutex_unlock(&u->readlock); |
1da177e4 LT |
860 | out: |
861 | return err; | |
862 | ||
863 | out_mknod_dput: | |
864 | dput(dentry); | |
865 | out_mknod_unlock: | |
4ac91378 | 866 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9b | 867 | path_put(&nd.path); |
1da177e4 LT |
868 | out_mknod_parent: |
869 | if (err==-EEXIST) | |
870 | err=-EADDRINUSE; | |
871 | unix_release_addr(addr); | |
872 | goto out_up; | |
873 | } | |
874 | ||
278a3de5 DM |
875 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
876 | { | |
877 | if (unlikely(sk1 == sk2) || !sk2) { | |
878 | unix_state_lock(sk1); | |
879 | return; | |
880 | } | |
881 | if (sk1 < sk2) { | |
882 | unix_state_lock(sk1); | |
883 | unix_state_lock_nested(sk2); | |
884 | } else { | |
885 | unix_state_lock(sk2); | |
886 | unix_state_lock_nested(sk1); | |
887 | } | |
888 | } | |
889 | ||
890 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
891 | { | |
892 | if (unlikely(sk1 == sk2) || !sk2) { | |
893 | unix_state_unlock(sk1); | |
894 | return; | |
895 | } | |
896 | unix_state_unlock(sk1); | |
897 | unix_state_unlock(sk2); | |
898 | } | |
899 | ||
1da177e4 LT |
900 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
901 | int alen, int flags) | |
902 | { | |
903 | struct sock *sk = sock->sk; | |
3b1e0a65 | 904 | struct net *net = sock_net(sk); |
1da177e4 LT |
905 | struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr; |
906 | struct sock *other; | |
907 | unsigned hash; | |
908 | int err; | |
909 | ||
910 | if (addr->sa_family != AF_UNSPEC) { | |
911 | err = unix_mkname(sunaddr, alen, &hash); | |
912 | if (err < 0) | |
913 | goto out; | |
914 | alen = err; | |
915 | ||
916 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
917 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
918 | goto out; | |
919 | ||
278a3de5 | 920 | restart: |
097e66c5 | 921 | other=unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
922 | if (!other) |
923 | goto out; | |
924 | ||
278a3de5 DM |
925 | unix_state_double_lock(sk, other); |
926 | ||
927 | /* Apparently VFS overslept socket death. Retry. */ | |
928 | if (sock_flag(other, SOCK_DEAD)) { | |
929 | unix_state_double_unlock(sk, other); | |
930 | sock_put(other); | |
931 | goto restart; | |
932 | } | |
1da177e4 LT |
933 | |
934 | err = -EPERM; | |
935 | if (!unix_may_send(sk, other)) | |
936 | goto out_unlock; | |
937 | ||
938 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
939 | if (err) | |
940 | goto out_unlock; | |
941 | ||
942 | } else { | |
943 | /* | |
944 | * 1003.1g breaking connected state with AF_UNSPEC | |
945 | */ | |
946 | other = NULL; | |
278a3de5 | 947 | unix_state_double_lock(sk, other); |
1da177e4 LT |
948 | } |
949 | ||
950 | /* | |
951 | * If it was connected, reconnect. | |
952 | */ | |
953 | if (unix_peer(sk)) { | |
954 | struct sock *old_peer = unix_peer(sk); | |
955 | unix_peer(sk)=other; | |
278a3de5 | 956 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
957 | |
958 | if (other != old_peer) | |
959 | unix_dgram_disconnected(sk, old_peer); | |
960 | sock_put(old_peer); | |
961 | } else { | |
962 | unix_peer(sk)=other; | |
278a3de5 | 963 | unix_state_double_unlock(sk, other); |
1da177e4 | 964 | } |
ac7bfa62 | 965 | return 0; |
1da177e4 LT |
966 | |
967 | out_unlock: | |
278a3de5 | 968 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
969 | sock_put(other); |
970 | out: | |
971 | return err; | |
972 | } | |
973 | ||
974 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
975 | { | |
976 | struct unix_sock *u = unix_sk(other); | |
977 | int sched; | |
978 | DEFINE_WAIT(wait); | |
979 | ||
980 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
981 | ||
982 | sched = !sock_flag(other, SOCK_DEAD) && | |
983 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
64a14651 | 984 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
985 | other->sk_max_ack_backlog); |
986 | ||
1c92b4e5 | 987 | unix_state_unlock(other); |
1da177e4 LT |
988 | |
989 | if (sched) | |
990 | timeo = schedule_timeout(timeo); | |
991 | ||
992 | finish_wait(&u->peer_wait, &wait); | |
993 | return timeo; | |
994 | } | |
995 | ||
996 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
997 | int addr_len, int flags) | |
998 | { | |
999 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
1000 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1001 | struct net *net = sock_net(sk); |
1da177e4 LT |
1002 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1003 | struct sock *newsk = NULL; | |
1004 | struct sock *other = NULL; | |
1005 | struct sk_buff *skb = NULL; | |
1006 | unsigned hash; | |
1007 | int st; | |
1008 | int err; | |
1009 | long timeo; | |
1010 | ||
1011 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1012 | if (err < 0) | |
1013 | goto out; | |
1014 | addr_len = err; | |
1015 | ||
1016 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1017 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1018 | goto out; | |
1019 | ||
1020 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1021 | ||
1022 | /* First of all allocate resources. | |
1023 | If we will make it after state is locked, | |
1024 | we will have to recheck all again in any case. | |
1025 | */ | |
1026 | ||
1027 | err = -ENOMEM; | |
1028 | ||
1029 | /* create new sock for complete connection */ | |
3b1e0a65 | 1030 | newsk = unix_create1(sock_net(sk), NULL); |
1da177e4 LT |
1031 | if (newsk == NULL) |
1032 | goto out; | |
1033 | ||
1034 | /* Allocate skb for sending to listening sock */ | |
1035 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1036 | if (skb == NULL) | |
1037 | goto out; | |
1038 | ||
1039 | restart: | |
1040 | /* Find listening sock. */ | |
097e66c5 | 1041 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1042 | if (!other) |
1043 | goto out; | |
1044 | ||
1045 | /* Latch state of peer */ | |
1c92b4e5 | 1046 | unix_state_lock(other); |
1da177e4 LT |
1047 | |
1048 | /* Apparently VFS overslept socket death. Retry. */ | |
1049 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1050 | unix_state_unlock(other); |
1da177e4 LT |
1051 | sock_put(other); |
1052 | goto restart; | |
1053 | } | |
1054 | ||
1055 | err = -ECONNREFUSED; | |
1056 | if (other->sk_state != TCP_LISTEN) | |
1057 | goto out_unlock; | |
1058 | ||
64a14651 | 1059 | if (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1060 | other->sk_max_ack_backlog) { |
1061 | err = -EAGAIN; | |
1062 | if (!timeo) | |
1063 | goto out_unlock; | |
1064 | ||
1065 | timeo = unix_wait_for_peer(other, timeo); | |
1066 | ||
1067 | err = sock_intr_errno(timeo); | |
1068 | if (signal_pending(current)) | |
1069 | goto out; | |
1070 | sock_put(other); | |
1071 | goto restart; | |
ac7bfa62 | 1072 | } |
1da177e4 LT |
1073 | |
1074 | /* Latch our state. | |
1075 | ||
1076 | It is tricky place. We need to grab write lock and cannot | |
1077 | drop lock on peer. It is dangerous because deadlock is | |
1078 | possible. Connect to self case and simultaneous | |
1079 | attempt to connect are eliminated by checking socket | |
1080 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1081 | check this before attempt to grab lock. | |
1082 | ||
1083 | Well, and we have to recheck the state after socket locked. | |
1084 | */ | |
1085 | st = sk->sk_state; | |
1086 | ||
1087 | switch (st) { | |
1088 | case TCP_CLOSE: | |
1089 | /* This is ok... continue with connect */ | |
1090 | break; | |
1091 | case TCP_ESTABLISHED: | |
1092 | /* Socket is already connected */ | |
1093 | err = -EISCONN; | |
1094 | goto out_unlock; | |
1095 | default: | |
1096 | err = -EINVAL; | |
1097 | goto out_unlock; | |
1098 | } | |
1099 | ||
1c92b4e5 | 1100 | unix_state_lock_nested(sk); |
1da177e4 LT |
1101 | |
1102 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1103 | unix_state_unlock(sk); |
1104 | unix_state_unlock(other); | |
1da177e4 LT |
1105 | sock_put(other); |
1106 | goto restart; | |
1107 | } | |
1108 | ||
1109 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1110 | if (err) { | |
1c92b4e5 | 1111 | unix_state_unlock(sk); |
1da177e4 LT |
1112 | goto out_unlock; |
1113 | } | |
1114 | ||
1115 | /* The way is open! Fastly set all the necessary fields... */ | |
1116 | ||
1117 | sock_hold(sk); | |
1118 | unix_peer(newsk) = sk; | |
1119 | newsk->sk_state = TCP_ESTABLISHED; | |
1120 | newsk->sk_type = sk->sk_type; | |
b488893a | 1121 | newsk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1122 | newsk->sk_peercred.uid = current->euid; |
1123 | newsk->sk_peercred.gid = current->egid; | |
1124 | newu = unix_sk(newsk); | |
1125 | newsk->sk_sleep = &newu->peer_wait; | |
1126 | otheru = unix_sk(other); | |
1127 | ||
1128 | /* copy address information from listening to new sock*/ | |
1129 | if (otheru->addr) { | |
1130 | atomic_inc(&otheru->addr->refcnt); | |
1131 | newu->addr = otheru->addr; | |
1132 | } | |
1133 | if (otheru->dentry) { | |
1134 | newu->dentry = dget(otheru->dentry); | |
1135 | newu->mnt = mntget(otheru->mnt); | |
1136 | } | |
1137 | ||
1138 | /* Set credentials */ | |
1139 | sk->sk_peercred = other->sk_peercred; | |
1140 | ||
1da177e4 LT |
1141 | sock->state = SS_CONNECTED; |
1142 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1143 | sock_hold(newsk); |
1144 | ||
1145 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1146 | unix_peer(sk) = newsk; | |
1da177e4 | 1147 | |
1c92b4e5 | 1148 | unix_state_unlock(sk); |
1da177e4 LT |
1149 | |
1150 | /* take ten and and send info to listening sock */ | |
1151 | spin_lock(&other->sk_receive_queue.lock); | |
1152 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1153 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1154 | unix_state_unlock(other); |
1da177e4 LT |
1155 | other->sk_data_ready(other, 0); |
1156 | sock_put(other); | |
1157 | return 0; | |
1158 | ||
1159 | out_unlock: | |
1160 | if (other) | |
1c92b4e5 | 1161 | unix_state_unlock(other); |
1da177e4 LT |
1162 | |
1163 | out: | |
1164 | if (skb) | |
1165 | kfree_skb(skb); | |
1166 | if (newsk) | |
1167 | unix_release_sock(newsk, 0); | |
1168 | if (other) | |
1169 | sock_put(other); | |
1170 | return err; | |
1171 | } | |
1172 | ||
1173 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1174 | { | |
1175 | struct sock *ska=socka->sk, *skb = sockb->sk; | |
1176 | ||
1177 | /* Join our sockets back to back */ | |
1178 | sock_hold(ska); | |
1179 | sock_hold(skb); | |
1180 | unix_peer(ska)=skb; | |
1181 | unix_peer(skb)=ska; | |
b488893a | 1182 | ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1183 | ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid; |
1184 | ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid; | |
1185 | ||
1186 | if (ska->sk_type != SOCK_DGRAM) { | |
1187 | ska->sk_state = TCP_ESTABLISHED; | |
1188 | skb->sk_state = TCP_ESTABLISHED; | |
1189 | socka->state = SS_CONNECTED; | |
1190 | sockb->state = SS_CONNECTED; | |
1191 | } | |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) | |
1196 | { | |
1197 | struct sock *sk = sock->sk; | |
1198 | struct sock *tsk; | |
1199 | struct sk_buff *skb; | |
1200 | int err; | |
1201 | ||
1202 | err = -EOPNOTSUPP; | |
1203 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
1204 | goto out; | |
1205 | ||
1206 | err = -EINVAL; | |
1207 | if (sk->sk_state != TCP_LISTEN) | |
1208 | goto out; | |
1209 | ||
1210 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1211 | * so that no locks are necessary. | |
1212 | */ | |
1213 | ||
1214 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1215 | if (!skb) { | |
1216 | /* This means receive shutdown. */ | |
1217 | if (err == 0) | |
1218 | err = -EINVAL; | |
1219 | goto out; | |
1220 | } | |
1221 | ||
1222 | tsk = skb->sk; | |
1223 | skb_free_datagram(sk, skb); | |
1224 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1225 | ||
1226 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1227 | unix_state_lock(tsk); |
1da177e4 LT |
1228 | newsock->state = SS_CONNECTED; |
1229 | sock_graft(tsk, newsock); | |
1c92b4e5 | 1230 | unix_state_unlock(tsk); |
1da177e4 LT |
1231 | return 0; |
1232 | ||
1233 | out: | |
1234 | return err; | |
1235 | } | |
1236 | ||
1237 | ||
1238 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1239 | { | |
1240 | struct sock *sk = sock->sk; | |
1241 | struct unix_sock *u; | |
1242 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
1243 | int err = 0; | |
1244 | ||
1245 | if (peer) { | |
1246 | sk = unix_peer_get(sk); | |
1247 | ||
1248 | err = -ENOTCONN; | |
1249 | if (!sk) | |
1250 | goto out; | |
1251 | err = 0; | |
1252 | } else { | |
1253 | sock_hold(sk); | |
1254 | } | |
1255 | ||
1256 | u = unix_sk(sk); | |
1c92b4e5 | 1257 | unix_state_lock(sk); |
1da177e4 LT |
1258 | if (!u->addr) { |
1259 | sunaddr->sun_family = AF_UNIX; | |
1260 | sunaddr->sun_path[0] = 0; | |
1261 | *uaddr_len = sizeof(short); | |
1262 | } else { | |
1263 | struct unix_address *addr = u->addr; | |
1264 | ||
1265 | *uaddr_len = addr->len; | |
1266 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1267 | } | |
1c92b4e5 | 1268 | unix_state_unlock(sk); |
1da177e4 LT |
1269 | sock_put(sk); |
1270 | out: | |
1271 | return err; | |
1272 | } | |
1273 | ||
1274 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1275 | { | |
1276 | int i; | |
1277 | ||
1278 | scm->fp = UNIXCB(skb).fp; | |
1279 | skb->destructor = sock_wfree; | |
1280 | UNIXCB(skb).fp = NULL; | |
1281 | ||
1282 | for (i=scm->fp->count-1; i>=0; i--) | |
1283 | unix_notinflight(scm->fp->fp[i]); | |
1284 | } | |
1285 | ||
1286 | static void unix_destruct_fds(struct sk_buff *skb) | |
1287 | { | |
1288 | struct scm_cookie scm; | |
1289 | memset(&scm, 0, sizeof(scm)); | |
1290 | unix_detach_fds(&scm, skb); | |
1291 | ||
1292 | /* Alas, it calls VFS */ | |
1293 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1294 | scm_destroy(&scm); | |
1295 | sock_wfree(skb); | |
1296 | } | |
1297 | ||
1298 | static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1299 | { | |
1300 | int i; | |
1301 | for (i=scm->fp->count-1; i>=0; i--) | |
1302 | unix_inflight(scm->fp->fp[i]); | |
1303 | UNIXCB(skb).fp = scm->fp; | |
1304 | skb->destructor = unix_destruct_fds; | |
1305 | scm->fp = NULL; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Send AF_UNIX data. | |
1310 | */ | |
1311 | ||
1312 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1313 | struct msghdr *msg, size_t len) | |
1314 | { | |
1315 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1316 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1317 | struct net *net = sock_net(sk); |
1da177e4 LT |
1318 | struct unix_sock *u = unix_sk(sk); |
1319 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1320 | struct sock *other = NULL; | |
1321 | int namelen = 0; /* fake GCC */ | |
1322 | int err; | |
1323 | unsigned hash; | |
1324 | struct sk_buff *skb; | |
1325 | long timeo; | |
1326 | struct scm_cookie tmp_scm; | |
1327 | ||
1328 | if (NULL == siocb->scm) | |
1329 | siocb->scm = &tmp_scm; | |
1330 | err = scm_send(sock, msg, siocb->scm); | |
1331 | if (err < 0) | |
1332 | return err; | |
1333 | ||
1334 | err = -EOPNOTSUPP; | |
1335 | if (msg->msg_flags&MSG_OOB) | |
1336 | goto out; | |
1337 | ||
1338 | if (msg->msg_namelen) { | |
1339 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1340 | if (err < 0) | |
1341 | goto out; | |
1342 | namelen = err; | |
1343 | } else { | |
1344 | sunaddr = NULL; | |
1345 | err = -ENOTCONN; | |
1346 | other = unix_peer_get(sk); | |
1347 | if (!other) | |
1348 | goto out; | |
1349 | } | |
1350 | ||
1351 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1352 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1353 | goto out; | |
1354 | ||
1355 | err = -EMSGSIZE; | |
1356 | if (len > sk->sk_sndbuf - 32) | |
1357 | goto out; | |
1358 | ||
1359 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); | |
1360 | if (skb==NULL) | |
1361 | goto out; | |
1362 | ||
1363 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1364 | if (siocb->scm->fp) | |
1365 | unix_attach_fds(siocb->scm, skb); | |
dc49c1f9 | 1366 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1367 | |
badff6d0 | 1368 | skb_reset_transport_header(skb); |
1da177e4 LT |
1369 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); |
1370 | if (err) | |
1371 | goto out_free; | |
1372 | ||
1373 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1374 | ||
1375 | restart: | |
1376 | if (!other) { | |
1377 | err = -ECONNRESET; | |
1378 | if (sunaddr == NULL) | |
1379 | goto out_free; | |
1380 | ||
097e66c5 | 1381 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 LT |
1382 | hash, &err); |
1383 | if (other==NULL) | |
1384 | goto out_free; | |
1385 | } | |
1386 | ||
1c92b4e5 | 1387 | unix_state_lock(other); |
1da177e4 LT |
1388 | err = -EPERM; |
1389 | if (!unix_may_send(sk, other)) | |
1390 | goto out_unlock; | |
1391 | ||
1392 | if (sock_flag(other, SOCK_DEAD)) { | |
1393 | /* | |
1394 | * Check with 1003.1g - what should | |
1395 | * datagram error | |
1396 | */ | |
1c92b4e5 | 1397 | unix_state_unlock(other); |
1da177e4 LT |
1398 | sock_put(other); |
1399 | ||
1400 | err = 0; | |
1c92b4e5 | 1401 | unix_state_lock(sk); |
1da177e4 LT |
1402 | if (unix_peer(sk) == other) { |
1403 | unix_peer(sk)=NULL; | |
1c92b4e5 | 1404 | unix_state_unlock(sk); |
1da177e4 LT |
1405 | |
1406 | unix_dgram_disconnected(sk, other); | |
1407 | sock_put(other); | |
1408 | err = -ECONNREFUSED; | |
1409 | } else { | |
1c92b4e5 | 1410 | unix_state_unlock(sk); |
1da177e4 LT |
1411 | } |
1412 | ||
1413 | other = NULL; | |
1414 | if (err) | |
1415 | goto out_free; | |
1416 | goto restart; | |
1417 | } | |
1418 | ||
1419 | err = -EPIPE; | |
1420 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1421 | goto out_unlock; | |
1422 | ||
1423 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1424 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1425 | if (err) | |
1426 | goto out_unlock; | |
1427 | } | |
1428 | ||
1429 | if (unix_peer(other) != sk && | |
64a14651 | 1430 | (skb_queue_len(&other->sk_receive_queue) > |
1da177e4 LT |
1431 | other->sk_max_ack_backlog)) { |
1432 | if (!timeo) { | |
1433 | err = -EAGAIN; | |
1434 | goto out_unlock; | |
1435 | } | |
1436 | ||
1437 | timeo = unix_wait_for_peer(other, timeo); | |
1438 | ||
1439 | err = sock_intr_errno(timeo); | |
1440 | if (signal_pending(current)) | |
1441 | goto out_free; | |
1442 | ||
1443 | goto restart; | |
1444 | } | |
1445 | ||
1446 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1447 | unix_state_unlock(other); |
1da177e4 LT |
1448 | other->sk_data_ready(other, len); |
1449 | sock_put(other); | |
1450 | scm_destroy(siocb->scm); | |
1451 | return len; | |
1452 | ||
1453 | out_unlock: | |
1c92b4e5 | 1454 | unix_state_unlock(other); |
1da177e4 LT |
1455 | out_free: |
1456 | kfree_skb(skb); | |
1457 | out: | |
1458 | if (other) | |
1459 | sock_put(other); | |
1460 | scm_destroy(siocb->scm); | |
1461 | return err; | |
1462 | } | |
1463 | ||
ac7bfa62 | 1464 | |
1da177e4 LT |
1465 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
1466 | struct msghdr *msg, size_t len) | |
1467 | { | |
1468 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1469 | struct sock *sk = sock->sk; | |
1470 | struct sock *other = NULL; | |
1471 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1472 | int err,size; | |
1473 | struct sk_buff *skb; | |
1474 | int sent=0; | |
1475 | struct scm_cookie tmp_scm; | |
1476 | ||
1477 | if (NULL == siocb->scm) | |
1478 | siocb->scm = &tmp_scm; | |
1479 | err = scm_send(sock, msg, siocb->scm); | |
1480 | if (err < 0) | |
1481 | return err; | |
1482 | ||
1483 | err = -EOPNOTSUPP; | |
1484 | if (msg->msg_flags&MSG_OOB) | |
1485 | goto out_err; | |
1486 | ||
1487 | if (msg->msg_namelen) { | |
1488 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1489 | goto out_err; | |
1490 | } else { | |
1491 | sunaddr = NULL; | |
1492 | err = -ENOTCONN; | |
830a1e5c | 1493 | other = unix_peer(sk); |
1da177e4 LT |
1494 | if (!other) |
1495 | goto out_err; | |
1496 | } | |
1497 | ||
1498 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1499 | goto pipe_err; | |
1500 | ||
1501 | while(sent < len) | |
1502 | { | |
1503 | /* | |
e9df7d7f BL |
1504 | * Optimisation for the fact that under 0.01% of X |
1505 | * messages typically need breaking up. | |
1da177e4 LT |
1506 | */ |
1507 | ||
e9df7d7f | 1508 | size = len-sent; |
1da177e4 LT |
1509 | |
1510 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1511 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1512 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1513 | |
1514 | if (size > SKB_MAX_ALLOC) | |
1515 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1516 | |
1da177e4 LT |
1517 | /* |
1518 | * Grab a buffer | |
1519 | */ | |
ac7bfa62 | 1520 | |
1da177e4 LT |
1521 | skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err); |
1522 | ||
1523 | if (skb==NULL) | |
1524 | goto out_err; | |
1525 | ||
1526 | /* | |
1527 | * If you pass two values to the sock_alloc_send_skb | |
1528 | * it tries to grab the large buffer with GFP_NOFS | |
1529 | * (which can fail easily), and if it fails grab the | |
1530 | * fallback size buffer which is under a page and will | |
1531 | * succeed. [Alan] | |
1532 | */ | |
1533 | size = min_t(int, size, skb_tailroom(skb)); | |
1534 | ||
1535 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1536 | if (siocb->scm->fp) | |
1537 | unix_attach_fds(siocb->scm, skb); | |
1538 | ||
1539 | if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) { | |
1540 | kfree_skb(skb); | |
1541 | goto out_err; | |
1542 | } | |
1543 | ||
1c92b4e5 | 1544 | unix_state_lock(other); |
1da177e4 LT |
1545 | |
1546 | if (sock_flag(other, SOCK_DEAD) || | |
1547 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1548 | goto pipe_err_free; | |
1549 | ||
1550 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1551 | unix_state_unlock(other); |
1da177e4 LT |
1552 | other->sk_data_ready(other, size); |
1553 | sent+=size; | |
1554 | } | |
1da177e4 LT |
1555 | |
1556 | scm_destroy(siocb->scm); | |
1557 | siocb->scm = NULL; | |
1558 | ||
1559 | return sent; | |
1560 | ||
1561 | pipe_err_free: | |
1c92b4e5 | 1562 | unix_state_unlock(other); |
1da177e4 LT |
1563 | kfree_skb(skb); |
1564 | pipe_err: | |
1565 | if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
1566 | send_sig(SIGPIPE,current,0); | |
1567 | err = -EPIPE; | |
1568 | out_err: | |
1da177e4 LT |
1569 | scm_destroy(siocb->scm); |
1570 | siocb->scm = NULL; | |
1571 | return sent ? : err; | |
1572 | } | |
1573 | ||
1574 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1575 | struct msghdr *msg, size_t len) | |
1576 | { | |
1577 | int err; | |
1578 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1579 | |
1da177e4 LT |
1580 | err = sock_error(sk); |
1581 | if (err) | |
1582 | return err; | |
1583 | ||
1584 | if (sk->sk_state != TCP_ESTABLISHED) | |
1585 | return -ENOTCONN; | |
1586 | ||
1587 | if (msg->msg_namelen) | |
1588 | msg->msg_namelen = 0; | |
1589 | ||
1590 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
1591 | } | |
ac7bfa62 | 1592 | |
1da177e4 LT |
1593 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
1594 | { | |
1595 | struct unix_sock *u = unix_sk(sk); | |
1596 | ||
1597 | msg->msg_namelen = 0; | |
1598 | if (u->addr) { | |
1599 | msg->msg_namelen = u->addr->len; | |
1600 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1605 | struct msghdr *msg, size_t size, | |
1606 | int flags) | |
1607 | { | |
1608 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1609 | struct scm_cookie tmp_scm; | |
1610 | struct sock *sk = sock->sk; | |
1611 | struct unix_sock *u = unix_sk(sk); | |
1612 | int noblock = flags & MSG_DONTWAIT; | |
1613 | struct sk_buff *skb; | |
1614 | int err; | |
1615 | ||
1616 | err = -EOPNOTSUPP; | |
1617 | if (flags&MSG_OOB) | |
1618 | goto out; | |
1619 | ||
1620 | msg->msg_namelen = 0; | |
1621 | ||
57b47a53 | 1622 | mutex_lock(&u->readlock); |
1da177e4 LT |
1623 | |
1624 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
0a112258 FZ |
1625 | if (!skb) { |
1626 | unix_state_lock(sk); | |
1627 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
1628 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
1629 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1630 | err = 0; | |
1631 | unix_state_unlock(sk); | |
1da177e4 | 1632 | goto out_unlock; |
0a112258 | 1633 | } |
1da177e4 | 1634 | |
71e20f18 | 1635 | wake_up_interruptible_sync(&u->peer_wait); |
1da177e4 LT |
1636 | |
1637 | if (msg->msg_name) | |
1638 | unix_copy_addr(msg, skb->sk); | |
1639 | ||
1640 | if (size > skb->len) | |
1641 | size = skb->len; | |
1642 | else if (size < skb->len) | |
1643 | msg->msg_flags |= MSG_TRUNC; | |
1644 | ||
1645 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); | |
1646 | if (err) | |
1647 | goto out_free; | |
1648 | ||
1649 | if (!siocb->scm) { | |
1650 | siocb->scm = &tmp_scm; | |
1651 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1652 | } | |
1653 | siocb->scm->creds = *UNIXCREDS(skb); | |
877ce7c1 | 1654 | unix_set_secdata(siocb->scm, skb); |
1da177e4 LT |
1655 | |
1656 | if (!(flags & MSG_PEEK)) | |
1657 | { | |
1658 | if (UNIXCB(skb).fp) | |
1659 | unix_detach_fds(siocb->scm, skb); | |
1660 | } | |
ac7bfa62 | 1661 | else |
1da177e4 LT |
1662 | { |
1663 | /* It is questionable: on PEEK we could: | |
1664 | - do not return fds - good, but too simple 8) | |
1665 | - return fds, and do not return them on read (old strategy, | |
1666 | apparently wrong) | |
1667 | - clone fds (I chose it for now, it is the most universal | |
1668 | solution) | |
ac7bfa62 YH |
1669 | |
1670 | POSIX 1003.1g does not actually define this clearly | |
1671 | at all. POSIX 1003.1g doesn't define a lot of things | |
1672 | clearly however! | |
1673 | ||
1da177e4 LT |
1674 | */ |
1675 | if (UNIXCB(skb).fp) | |
1676 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1677 | } | |
1678 | err = size; | |
1679 | ||
1680 | scm_recv(sock, msg, siocb->scm, flags); | |
1681 | ||
1682 | out_free: | |
1683 | skb_free_datagram(sk,skb); | |
1684 | out_unlock: | |
57b47a53 | 1685 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1686 | out: |
1687 | return err; | |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * Sleep until data has arrive. But check for races.. | |
1692 | */ | |
ac7bfa62 | 1693 | |
1da177e4 LT |
1694 | static long unix_stream_data_wait(struct sock * sk, long timeo) |
1695 | { | |
1696 | DEFINE_WAIT(wait); | |
1697 | ||
1c92b4e5 | 1698 | unix_state_lock(sk); |
1da177e4 LT |
1699 | |
1700 | for (;;) { | |
1701 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1702 | ||
b03efcfb | 1703 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
1704 | sk->sk_err || |
1705 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1706 | signal_pending(current) || | |
1707 | !timeo) | |
1708 | break; | |
1709 | ||
1710 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 1711 | unix_state_unlock(sk); |
1da177e4 | 1712 | timeo = schedule_timeout(timeo); |
1c92b4e5 | 1713 | unix_state_lock(sk); |
1da177e4 LT |
1714 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1715 | } | |
1716 | ||
1717 | finish_wait(sk->sk_sleep, &wait); | |
1c92b4e5 | 1718 | unix_state_unlock(sk); |
1da177e4 LT |
1719 | return timeo; |
1720 | } | |
1721 | ||
1722 | ||
1723 | ||
1724 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1725 | struct msghdr *msg, size_t size, | |
1726 | int flags) | |
1727 | { | |
1728 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1729 | struct scm_cookie tmp_scm; | |
1730 | struct sock *sk = sock->sk; | |
1731 | struct unix_sock *u = unix_sk(sk); | |
1732 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1733 | int copied = 0; | |
1734 | int check_creds = 0; | |
1735 | int target; | |
1736 | int err = 0; | |
1737 | long timeo; | |
1738 | ||
1739 | err = -EINVAL; | |
1740 | if (sk->sk_state != TCP_ESTABLISHED) | |
1741 | goto out; | |
1742 | ||
1743 | err = -EOPNOTSUPP; | |
1744 | if (flags&MSG_OOB) | |
1745 | goto out; | |
1746 | ||
1747 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
1748 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
1749 | ||
1750 | msg->msg_namelen = 0; | |
1751 | ||
1752 | /* Lock the socket to prevent queue disordering | |
1753 | * while sleeps in memcpy_tomsg | |
1754 | */ | |
1755 | ||
1756 | if (!siocb->scm) { | |
1757 | siocb->scm = &tmp_scm; | |
1758 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1759 | } | |
1760 | ||
57b47a53 | 1761 | mutex_lock(&u->readlock); |
1da177e4 LT |
1762 | |
1763 | do | |
1764 | { | |
1765 | int chunk; | |
1766 | struct sk_buff *skb; | |
1767 | ||
3c0d2f37 | 1768 | unix_state_lock(sk); |
1da177e4 LT |
1769 | skb = skb_dequeue(&sk->sk_receive_queue); |
1770 | if (skb==NULL) | |
1771 | { | |
1772 | if (copied >= target) | |
3c0d2f37 | 1773 | goto unlock; |
1da177e4 LT |
1774 | |
1775 | /* | |
1776 | * POSIX 1003.1g mandates this order. | |
1777 | */ | |
ac7bfa62 | 1778 | |
1da177e4 | 1779 | if ((err = sock_error(sk)) != 0) |
3c0d2f37 | 1780 | goto unlock; |
1da177e4 | 1781 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
1782 | goto unlock; |
1783 | ||
1784 | unix_state_unlock(sk); | |
1da177e4 LT |
1785 | err = -EAGAIN; |
1786 | if (!timeo) | |
1787 | break; | |
57b47a53 | 1788 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1789 | |
1790 | timeo = unix_stream_data_wait(sk, timeo); | |
1791 | ||
1792 | if (signal_pending(current)) { | |
1793 | err = sock_intr_errno(timeo); | |
1794 | goto out; | |
1795 | } | |
57b47a53 | 1796 | mutex_lock(&u->readlock); |
1da177e4 | 1797 | continue; |
3c0d2f37 MS |
1798 | unlock: |
1799 | unix_state_unlock(sk); | |
1800 | break; | |
1da177e4 | 1801 | } |
3c0d2f37 | 1802 | unix_state_unlock(sk); |
1da177e4 LT |
1803 | |
1804 | if (check_creds) { | |
1805 | /* Never glue messages from different writers */ | |
1806 | if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) { | |
1807 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1808 | break; | |
1809 | } | |
1810 | } else { | |
1811 | /* Copy credentials */ | |
1812 | siocb->scm->creds = *UNIXCREDS(skb); | |
1813 | check_creds = 1; | |
1814 | } | |
1815 | ||
1816 | /* Copy address just once */ | |
1817 | if (sunaddr) | |
1818 | { | |
1819 | unix_copy_addr(msg, skb->sk); | |
1820 | sunaddr = NULL; | |
1821 | } | |
1822 | ||
1823 | chunk = min_t(unsigned int, skb->len, size); | |
1824 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
1825 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1826 | if (copied == 0) | |
1827 | copied = -EFAULT; | |
1828 | break; | |
1829 | } | |
1830 | copied += chunk; | |
1831 | size -= chunk; | |
1832 | ||
1833 | /* Mark read part of skb as used */ | |
1834 | if (!(flags & MSG_PEEK)) | |
1835 | { | |
1836 | skb_pull(skb, chunk); | |
1837 | ||
1838 | if (UNIXCB(skb).fp) | |
1839 | unix_detach_fds(siocb->scm, skb); | |
1840 | ||
1841 | /* put the skb back if we didn't use it up.. */ | |
1842 | if (skb->len) | |
1843 | { | |
1844 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1845 | break; | |
1846 | } | |
1847 | ||
1848 | kfree_skb(skb); | |
1849 | ||
1850 | if (siocb->scm->fp) | |
1851 | break; | |
1852 | } | |
1853 | else | |
1854 | { | |
1855 | /* It is questionable, see note in unix_dgram_recvmsg. | |
1856 | */ | |
1857 | if (UNIXCB(skb).fp) | |
1858 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1859 | ||
1860 | /* put message back and return */ | |
1861 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1862 | break; | |
1863 | } | |
1864 | } while (size); | |
1865 | ||
57b47a53 | 1866 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1867 | scm_recv(sock, msg, siocb->scm, flags); |
1868 | out: | |
1869 | return copied ? : err; | |
1870 | } | |
1871 | ||
1872 | static int unix_shutdown(struct socket *sock, int mode) | |
1873 | { | |
1874 | struct sock *sk = sock->sk; | |
1875 | struct sock *other; | |
1876 | ||
1877 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); | |
1878 | ||
1879 | if (mode) { | |
1c92b4e5 | 1880 | unix_state_lock(sk); |
1da177e4 LT |
1881 | sk->sk_shutdown |= mode; |
1882 | other=unix_peer(sk); | |
1883 | if (other) | |
1884 | sock_hold(other); | |
1c92b4e5 | 1885 | unix_state_unlock(sk); |
1da177e4 LT |
1886 | sk->sk_state_change(sk); |
1887 | ||
1888 | if (other && | |
1889 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
1890 | ||
1891 | int peer_mode = 0; | |
1892 | ||
1893 | if (mode&RCV_SHUTDOWN) | |
1894 | peer_mode |= SEND_SHUTDOWN; | |
1895 | if (mode&SEND_SHUTDOWN) | |
1896 | peer_mode |= RCV_SHUTDOWN; | |
1c92b4e5 | 1897 | unix_state_lock(other); |
1da177e4 | 1898 | other->sk_shutdown |= peer_mode; |
1c92b4e5 | 1899 | unix_state_unlock(other); |
1da177e4 LT |
1900 | other->sk_state_change(other); |
1901 | read_lock(&other->sk_callback_lock); | |
1902 | if (peer_mode == SHUTDOWN_MASK) | |
8d8ad9d7 | 1903 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 | 1904 | else if (peer_mode & RCV_SHUTDOWN) |
8d8ad9d7 | 1905 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1906 | read_unlock(&other->sk_callback_lock); |
1907 | } | |
1908 | if (other) | |
1909 | sock_put(other); | |
1910 | } | |
1911 | return 0; | |
1912 | } | |
1913 | ||
1914 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1915 | { | |
1916 | struct sock *sk = sock->sk; | |
1917 | long amount=0; | |
1918 | int err; | |
1919 | ||
1920 | switch(cmd) | |
1921 | { | |
1922 | case SIOCOUTQ: | |
1923 | amount = atomic_read(&sk->sk_wmem_alloc); | |
1924 | err = put_user(amount, (int __user *)arg); | |
1925 | break; | |
1926 | case SIOCINQ: | |
1927 | { | |
1928 | struct sk_buff *skb; | |
1929 | ||
1930 | if (sk->sk_state == TCP_LISTEN) { | |
1931 | err = -EINVAL; | |
1932 | break; | |
1933 | } | |
1934 | ||
1935 | spin_lock(&sk->sk_receive_queue.lock); | |
1936 | if (sk->sk_type == SOCK_STREAM || | |
1937 | sk->sk_type == SOCK_SEQPACKET) { | |
1938 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
1939 | amount += skb->len; | |
1940 | } else { | |
1941 | skb = skb_peek(&sk->sk_receive_queue); | |
1942 | if (skb) | |
1943 | amount=skb->len; | |
1944 | } | |
1945 | spin_unlock(&sk->sk_receive_queue.lock); | |
1946 | err = put_user(amount, (int __user *)arg); | |
1947 | break; | |
1948 | } | |
1949 | ||
1950 | default: | |
b5e5fa5e | 1951 | err = -ENOIOCTLCMD; |
1da177e4 LT |
1952 | break; |
1953 | } | |
1954 | return err; | |
1955 | } | |
1956 | ||
1957 | static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait) | |
1958 | { | |
1959 | struct sock *sk = sock->sk; | |
1960 | unsigned int mask; | |
1961 | ||
1962 | poll_wait(file, sk->sk_sleep, wait); | |
1963 | mask = 0; | |
1964 | ||
1965 | /* exceptional events? */ | |
1966 | if (sk->sk_err) | |
1967 | mask |= POLLERR; | |
1968 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1969 | mask |= POLLHUP; | |
f348d70a DL |
1970 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1971 | mask |= POLLRDHUP; | |
1da177e4 LT |
1972 | |
1973 | /* readable? */ | |
1974 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1975 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1976 | mask |= POLLIN | POLLRDNORM; | |
1977 | ||
1978 | /* Connection-based need to check for termination and startup */ | |
1979 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE) | |
1980 | mask |= POLLHUP; | |
1981 | ||
1982 | /* | |
1983 | * we set writable also when the other side has shut down the | |
1984 | * connection. This prevents stuck sockets. | |
1985 | */ | |
1986 | if (unix_writable(sk)) | |
1987 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1988 | ||
1989 | return mask; | |
1990 | } | |
1991 | ||
1992 | ||
1993 | #ifdef CONFIG_PROC_FS | |
a53eb3fe PE |
1994 | static struct sock *first_unix_socket(int *i) |
1995 | { | |
1996 | for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { | |
1997 | if (!hlist_empty(&unix_socket_table[*i])) | |
1998 | return __sk_head(&unix_socket_table[*i]); | |
1999 | } | |
2000 | return NULL; | |
2001 | } | |
2002 | ||
2003 | static struct sock *next_unix_socket(int *i, struct sock *s) | |
2004 | { | |
2005 | struct sock *next = sk_next(s); | |
2006 | /* More in this chain? */ | |
2007 | if (next) | |
2008 | return next; | |
2009 | /* Look for next non-empty chain. */ | |
2010 | for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2011 | if (!hlist_empty(&unix_socket_table[*i])) | |
2012 | return __sk_head(&unix_socket_table[*i]); | |
2013 | } | |
2014 | return NULL; | |
2015 | } | |
2016 | ||
097e66c5 | 2017 | struct unix_iter_state { |
e372c414 | 2018 | struct seq_net_private p; |
097e66c5 DL |
2019 | int i; |
2020 | }; | |
1218854a | 2021 | static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 2022 | { |
1218854a | 2023 | struct unix_iter_state *iter = seq->private; |
1da177e4 LT |
2024 | loff_t off = 0; |
2025 | struct sock *s; | |
2026 | ||
097e66c5 | 2027 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
1218854a | 2028 | if (sock_net(s) != seq_file_net(seq)) |
097e66c5 | 2029 | continue; |
ac7bfa62 | 2030 | if (off == pos) |
1da177e4 LT |
2031 | return s; |
2032 | ++off; | |
2033 | } | |
2034 | return NULL; | |
2035 | } | |
2036 | ||
2037 | ||
2038 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) | |
9a429c49 | 2039 | __acquires(unix_table_lock) |
1da177e4 | 2040 | { |
fbe9cc4a | 2041 | spin_lock(&unix_table_lock); |
b9f3124f | 2042 | return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2043 | } |
2044 | ||
2045 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2046 | { | |
097e66c5 DL |
2047 | struct unix_iter_state *iter = seq->private; |
2048 | struct sock *sk = v; | |
1da177e4 LT |
2049 | ++*pos; |
2050 | ||
b9f3124f | 2051 | if (v == SEQ_START_TOKEN) |
097e66c5 DL |
2052 | sk = first_unix_socket(&iter->i); |
2053 | else | |
2054 | sk = next_unix_socket(&iter->i, sk); | |
1218854a | 2055 | while (sk && (sock_net(sk) != seq_file_net(seq))) |
097e66c5 DL |
2056 | sk = next_unix_socket(&iter->i, sk); |
2057 | return sk; | |
1da177e4 LT |
2058 | } |
2059 | ||
2060 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2061 | __releases(unix_table_lock) |
1da177e4 | 2062 | { |
fbe9cc4a | 2063 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2064 | } |
2065 | ||
2066 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2067 | { | |
ac7bfa62 | 2068 | |
b9f3124f | 2069 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2070 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2071 | "Inode Path\n"); | |
2072 | else { | |
2073 | struct sock *s = v; | |
2074 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2075 | unix_state_lock(s); |
1da177e4 LT |
2076 | |
2077 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", | |
2078 | s, | |
2079 | atomic_read(&s->sk_refcnt), | |
2080 | 0, | |
2081 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2082 | s->sk_type, | |
2083 | s->sk_socket ? | |
2084 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2085 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2086 | sock_i_ino(s)); | |
2087 | ||
2088 | if (u->addr) { | |
2089 | int i, len; | |
2090 | seq_putc(seq, ' '); | |
2091 | ||
2092 | i = 0; | |
2093 | len = u->addr->len - sizeof(short); | |
2094 | if (!UNIX_ABSTRACT(s)) | |
2095 | len--; | |
2096 | else { | |
2097 | seq_putc(seq, '@'); | |
2098 | i++; | |
2099 | } | |
2100 | for ( ; i < len; i++) | |
2101 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2102 | } | |
1c92b4e5 | 2103 | unix_state_unlock(s); |
1da177e4 LT |
2104 | seq_putc(seq, '\n'); |
2105 | } | |
2106 | ||
2107 | return 0; | |
2108 | } | |
2109 | ||
56b3d975 | 2110 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2111 | .start = unix_seq_start, |
2112 | .next = unix_seq_next, | |
2113 | .stop = unix_seq_stop, | |
2114 | .show = unix_seq_show, | |
2115 | }; | |
2116 | ||
2117 | ||
2118 | static int unix_seq_open(struct inode *inode, struct file *file) | |
2119 | { | |
e372c414 DL |
2120 | return seq_open_net(inode, file, &unix_seq_ops, |
2121 | sizeof(struct unix_iter_state)); | |
1da177e4 LT |
2122 | } |
2123 | ||
da7071d7 | 2124 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2125 | .owner = THIS_MODULE, |
2126 | .open = unix_seq_open, | |
2127 | .read = seq_read, | |
2128 | .llseek = seq_lseek, | |
e372c414 | 2129 | .release = seq_release_net, |
1da177e4 LT |
2130 | }; |
2131 | ||
2132 | #endif | |
2133 | ||
2134 | static struct net_proto_family unix_family_ops = { | |
2135 | .family = PF_UNIX, | |
2136 | .create = unix_create, | |
2137 | .owner = THIS_MODULE, | |
2138 | }; | |
2139 | ||
097e66c5 DL |
2140 | |
2141 | static int unix_net_init(struct net *net) | |
2142 | { | |
2143 | int error = -ENOMEM; | |
2144 | ||
a0a53c8b | 2145 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2146 | if (unix_sysctl_register(net)) |
2147 | goto out; | |
d392e497 | 2148 | |
097e66c5 | 2149 | #ifdef CONFIG_PROC_FS |
1597fbc0 PE |
2150 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) { |
2151 | unix_sysctl_unregister(net); | |
097e66c5 | 2152 | goto out; |
1597fbc0 | 2153 | } |
097e66c5 DL |
2154 | #endif |
2155 | error = 0; | |
2156 | out: | |
2157 | return 0; | |
2158 | } | |
2159 | ||
2160 | static void unix_net_exit(struct net *net) | |
2161 | { | |
1597fbc0 | 2162 | unix_sysctl_unregister(net); |
097e66c5 DL |
2163 | proc_net_remove(net, "unix"); |
2164 | } | |
2165 | ||
2166 | static struct pernet_operations unix_net_ops = { | |
2167 | .init = unix_net_init, | |
2168 | .exit = unix_net_exit, | |
2169 | }; | |
2170 | ||
1da177e4 LT |
2171 | static int __init af_unix_init(void) |
2172 | { | |
2173 | int rc = -1; | |
2174 | struct sk_buff *dummy_skb; | |
2175 | ||
ef047f5e | 2176 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
2177 | |
2178 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2179 | if (rc != 0) { |
2180 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
0dc47877 | 2181 | __func__); |
1da177e4 LT |
2182 | goto out; |
2183 | } | |
2184 | ||
2185 | sock_register(&unix_family_ops); | |
097e66c5 | 2186 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2187 | out: |
2188 | return rc; | |
2189 | } | |
2190 | ||
2191 | static void __exit af_unix_exit(void) | |
2192 | { | |
2193 | sock_unregister(PF_UNIX); | |
1da177e4 | 2194 | proto_unregister(&unix_proto); |
097e66c5 | 2195 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2196 | } |
2197 | ||
3d366960 DW |
2198 | /* Earlier than device_initcall() so that other drivers invoking |
2199 | request_module() don't end up in a loop when modprobe tries | |
2200 | to use a UNIX socket. But later than subsys_initcall() because | |
2201 | we depend on stuff initialised there */ | |
2202 | fs_initcall(af_unix_init); | |
1da177e4 LT |
2203 | module_exit(af_unix_exit); |
2204 | ||
2205 | MODULE_LICENSE("GPL"); | |
2206 | MODULE_ALIAS_NETPROTO(PF_UNIX); |