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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET4: Implementation of BSD Unix domain sockets. | |
3 | * | |
113aa838 | 4 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
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 | { | |
6eba6a37 | 167 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
1da177e4 LT |
168 | } |
169 | ||
3c73419c RW |
170 | static inline int unix_recvq_full(struct sock const *sk) |
171 | { | |
172 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static struct sock *unix_peer_get(struct sock *s) |
176 | { | |
177 | struct sock *peer; | |
178 | ||
1c92b4e5 | 179 | unix_state_lock(s); |
1da177e4 LT |
180 | peer = unix_peer(s); |
181 | if (peer) | |
182 | sock_hold(peer); | |
1c92b4e5 | 183 | unix_state_unlock(s); |
1da177e4 LT |
184 | return peer; |
185 | } | |
186 | ||
187 | static inline void unix_release_addr(struct unix_address *addr) | |
188 | { | |
189 | if (atomic_dec_and_test(&addr->refcnt)) | |
190 | kfree(addr); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Check unix socket name: | |
195 | * - should be not zero length. | |
196 | * - if started by not zero, should be NULL terminated (FS object) | |
197 | * - if started by zero, it is abstract name. | |
198 | */ | |
ac7bfa62 | 199 | |
6eba6a37 | 200 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned *hashp) |
1da177e4 LT |
201 | { |
202 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
203 | return -EINVAL; | |
204 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
205 | return -EINVAL; | |
206 | if (sunaddr->sun_path[0]) { | |
207 | /* | |
208 | * This may look like an off by one error but it is a bit more | |
209 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
210 | * sun_path[108] doesnt as such exist. However in kernel space | |
211 | * we are guaranteed that it is a valid memory location in our | |
212 | * kernel address buffer. | |
213 | */ | |
e27dfcea | 214 | ((char *)sunaddr)[len] = 0; |
1da177e4 LT |
215 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
216 | return len; | |
217 | } | |
218 | ||
6eba6a37 | 219 | *hashp = unix_hash_fold(csum_partial((char *)sunaddr, len, 0)); |
1da177e4 LT |
220 | return len; |
221 | } | |
222 | ||
223 | static void __unix_remove_socket(struct sock *sk) | |
224 | { | |
225 | sk_del_node_init(sk); | |
226 | } | |
227 | ||
228 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
229 | { | |
547b792c | 230 | WARN_ON(!sk_unhashed(sk)); |
1da177e4 LT |
231 | sk_add_node(sk, list); |
232 | } | |
233 | ||
234 | static inline void unix_remove_socket(struct sock *sk) | |
235 | { | |
fbe9cc4a | 236 | spin_lock(&unix_table_lock); |
1da177e4 | 237 | __unix_remove_socket(sk); |
fbe9cc4a | 238 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
239 | } |
240 | ||
241 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
242 | { | |
fbe9cc4a | 243 | spin_lock(&unix_table_lock); |
1da177e4 | 244 | __unix_insert_socket(list, sk); |
fbe9cc4a | 245 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
246 | } |
247 | ||
097e66c5 DL |
248 | static struct sock *__unix_find_socket_byname(struct net *net, |
249 | struct sockaddr_un *sunname, | |
1da177e4 LT |
250 | int len, int type, unsigned hash) |
251 | { | |
252 | struct sock *s; | |
253 | struct hlist_node *node; | |
254 | ||
255 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { | |
256 | struct unix_sock *u = unix_sk(s); | |
257 | ||
878628fb | 258 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
259 | continue; |
260 | ||
1da177e4 LT |
261 | if (u->addr->len == len && |
262 | !memcmp(u->addr->name, sunname, len)) | |
263 | goto found; | |
264 | } | |
265 | s = NULL; | |
266 | found: | |
267 | return s; | |
268 | } | |
269 | ||
097e66c5 DL |
270 | static inline struct sock *unix_find_socket_byname(struct net *net, |
271 | struct sockaddr_un *sunname, | |
1da177e4 LT |
272 | int len, int type, |
273 | unsigned hash) | |
274 | { | |
275 | struct sock *s; | |
276 | ||
fbe9cc4a | 277 | spin_lock(&unix_table_lock); |
097e66c5 | 278 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
279 | if (s) |
280 | sock_hold(s); | |
fbe9cc4a | 281 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
282 | return s; |
283 | } | |
284 | ||
097e66c5 | 285 | static struct sock *unix_find_socket_byinode(struct net *net, struct inode *i) |
1da177e4 LT |
286 | { |
287 | struct sock *s; | |
288 | struct hlist_node *node; | |
289 | ||
fbe9cc4a | 290 | spin_lock(&unix_table_lock); |
1da177e4 LT |
291 | sk_for_each(s, node, |
292 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { | |
293 | struct dentry *dentry = unix_sk(s)->dentry; | |
294 | ||
878628fb | 295 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
296 | continue; |
297 | ||
6eba6a37 | 298 | if (dentry && dentry->d_inode == i) { |
1da177e4 LT |
299 | sock_hold(s); |
300 | goto found; | |
301 | } | |
302 | } | |
303 | s = NULL; | |
304 | found: | |
fbe9cc4a | 305 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
306 | return s; |
307 | } | |
308 | ||
309 | static inline int unix_writable(struct sock *sk) | |
310 | { | |
311 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
312 | } | |
313 | ||
314 | static void unix_write_space(struct sock *sk) | |
315 | { | |
316 | read_lock(&sk->sk_callback_lock); | |
317 | if (unix_writable(sk)) { | |
318 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
71e20f18 | 319 | wake_up_interruptible_sync(sk->sk_sleep); |
8d8ad9d7 | 320 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
321 | } |
322 | read_unlock(&sk->sk_callback_lock); | |
323 | } | |
324 | ||
325 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
326 | * queue of packets arrived from previous peer. First, it allows to do | |
327 | * flow control based only on wmem_alloc; second, sk connected to peer | |
328 | * may receive messages only from that peer. */ | |
329 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
330 | { | |
b03efcfb | 331 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
332 | skb_queue_purge(&sk->sk_receive_queue); |
333 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
334 | ||
335 | /* If one link of bidirectional dgram pipe is disconnected, | |
336 | * we signal error. Messages are lost. Do not make this, | |
337 | * when peer was not connected to us. | |
338 | */ | |
339 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
340 | other->sk_err = ECONNRESET; | |
341 | other->sk_error_report(other); | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | static void unix_sock_destructor(struct sock *sk) | |
347 | { | |
348 | struct unix_sock *u = unix_sk(sk); | |
349 | ||
350 | skb_queue_purge(&sk->sk_receive_queue); | |
351 | ||
547b792c IJ |
352 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
353 | WARN_ON(!sk_unhashed(sk)); | |
354 | WARN_ON(sk->sk_socket); | |
1da177e4 | 355 | if (!sock_flag(sk, SOCK_DEAD)) { |
6eba6a37 | 356 | printk(KERN_DEBUG "Attempt to release alive unix socket: %p\n", sk); |
1da177e4 LT |
357 | return; |
358 | } | |
359 | ||
360 | if (u->addr) | |
361 | unix_release_addr(u->addr); | |
362 | ||
363 | atomic_dec(&unix_nr_socks); | |
a8076d8d | 364 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
1da177e4 | 365 | #ifdef UNIX_REFCNT_DEBUG |
6eba6a37 ED |
366 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, |
367 | atomic_read(&unix_nr_socks)); | |
1da177e4 LT |
368 | #endif |
369 | } | |
370 | ||
6eba6a37 | 371 | static int unix_release_sock(struct sock *sk, int embrion) |
1da177e4 LT |
372 | { |
373 | struct unix_sock *u = unix_sk(sk); | |
374 | struct dentry *dentry; | |
375 | struct vfsmount *mnt; | |
376 | struct sock *skpair; | |
377 | struct sk_buff *skb; | |
378 | int state; | |
379 | ||
380 | unix_remove_socket(sk); | |
381 | ||
382 | /* Clear state */ | |
1c92b4e5 | 383 | unix_state_lock(sk); |
1da177e4 LT |
384 | sock_orphan(sk); |
385 | sk->sk_shutdown = SHUTDOWN_MASK; | |
386 | dentry = u->dentry; | |
387 | u->dentry = NULL; | |
388 | mnt = u->mnt; | |
389 | u->mnt = NULL; | |
390 | state = sk->sk_state; | |
391 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 392 | unix_state_unlock(sk); |
1da177e4 LT |
393 | |
394 | wake_up_interruptible_all(&u->peer_wait); | |
395 | ||
e27dfcea | 396 | skpair = unix_peer(sk); |
1da177e4 | 397 | |
e27dfcea | 398 | if (skpair != NULL) { |
1da177e4 | 399 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
1c92b4e5 | 400 | unix_state_lock(skpair); |
1da177e4 LT |
401 | /* No more writes */ |
402 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
403 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
404 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 405 | unix_state_unlock(skpair); |
1da177e4 LT |
406 | skpair->sk_state_change(skpair); |
407 | read_lock(&skpair->sk_callback_lock); | |
8d8ad9d7 | 408 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 LT |
409 | read_unlock(&skpair->sk_callback_lock); |
410 | } | |
411 | sock_put(skpair); /* It may now die */ | |
412 | unix_peer(sk) = NULL; | |
413 | } | |
414 | ||
415 | /* Try to flush out this socket. Throw out buffers at least */ | |
416 | ||
417 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e27dfcea | 418 | if (state == TCP_LISTEN) |
1da177e4 LT |
419 | unix_release_sock(skb->sk, 1); |
420 | /* passed fds are erased in the kfree_skb hook */ | |
421 | kfree_skb(skb); | |
422 | } | |
423 | ||
424 | if (dentry) { | |
425 | dput(dentry); | |
426 | mntput(mnt); | |
427 | } | |
428 | ||
429 | sock_put(sk); | |
430 | ||
431 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
432 | ||
433 | /* | |
434 | * Fixme: BSD difference: In BSD all sockets connected to use get | |
435 | * ECONNRESET and we die on the spot. In Linux we behave | |
436 | * like files and pipes do and wait for the last | |
437 | * dereference. | |
438 | * | |
439 | * Can't we simply set sock->err? | |
440 | * | |
441 | * What the above comment does talk about? --ANK(980817) | |
442 | */ | |
443 | ||
9305cfa4 | 444 | if (unix_tot_inflight) |
ac7bfa62 | 445 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
446 | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static int unix_listen(struct socket *sock, int backlog) | |
451 | { | |
452 | int err; | |
453 | struct sock *sk = sock->sk; | |
454 | struct unix_sock *u = unix_sk(sk); | |
455 | ||
456 | err = -EOPNOTSUPP; | |
6eba6a37 ED |
457 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
458 | goto out; /* Only stream/seqpacket sockets accept */ | |
1da177e4 LT |
459 | err = -EINVAL; |
460 | if (!u->addr) | |
6eba6a37 | 461 | goto out; /* No listens on an unbound socket */ |
1c92b4e5 | 462 | unix_state_lock(sk); |
1da177e4 LT |
463 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
464 | goto out_unlock; | |
465 | if (backlog > sk->sk_max_ack_backlog) | |
466 | wake_up_interruptible_all(&u->peer_wait); | |
467 | sk->sk_max_ack_backlog = backlog; | |
468 | sk->sk_state = TCP_LISTEN; | |
469 | /* set credentials so connect can copy them */ | |
b488893a | 470 | sk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
471 | sk->sk_peercred.uid = current->euid; |
472 | sk->sk_peercred.gid = current->egid; | |
473 | err = 0; | |
474 | ||
475 | out_unlock: | |
1c92b4e5 | 476 | unix_state_unlock(sk); |
1da177e4 LT |
477 | out: |
478 | return err; | |
479 | } | |
480 | ||
481 | static int unix_release(struct socket *); | |
482 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
483 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
484 | int addr_len, int flags); | |
485 | static int unix_socketpair(struct socket *, struct socket *); | |
486 | static int unix_accept(struct socket *, struct socket *, int); | |
487 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
488 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
ec0d215f RW |
489 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
490 | poll_table *); | |
1da177e4 LT |
491 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
492 | static int unix_shutdown(struct socket *, int); | |
493 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
494 | struct msghdr *, size_t); | |
495 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
496 | struct msghdr *, size_t, int); | |
497 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
498 | struct msghdr *, size_t); | |
499 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
500 | struct msghdr *, size_t, int); | |
501 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
502 | int, int); | |
503 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
504 | struct msghdr *, size_t); | |
505 | ||
90ddc4f0 | 506 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
507 | .family = PF_UNIX, |
508 | .owner = THIS_MODULE, | |
509 | .release = unix_release, | |
510 | .bind = unix_bind, | |
511 | .connect = unix_stream_connect, | |
512 | .socketpair = unix_socketpair, | |
513 | .accept = unix_accept, | |
514 | .getname = unix_getname, | |
515 | .poll = unix_poll, | |
516 | .ioctl = unix_ioctl, | |
517 | .listen = unix_listen, | |
518 | .shutdown = unix_shutdown, | |
519 | .setsockopt = sock_no_setsockopt, | |
520 | .getsockopt = sock_no_getsockopt, | |
521 | .sendmsg = unix_stream_sendmsg, | |
522 | .recvmsg = unix_stream_recvmsg, | |
523 | .mmap = sock_no_mmap, | |
524 | .sendpage = sock_no_sendpage, | |
525 | }; | |
526 | ||
90ddc4f0 | 527 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
528 | .family = PF_UNIX, |
529 | .owner = THIS_MODULE, | |
530 | .release = unix_release, | |
531 | .bind = unix_bind, | |
532 | .connect = unix_dgram_connect, | |
533 | .socketpair = unix_socketpair, | |
534 | .accept = sock_no_accept, | |
535 | .getname = unix_getname, | |
ec0d215f | 536 | .poll = unix_dgram_poll, |
1da177e4 LT |
537 | .ioctl = unix_ioctl, |
538 | .listen = sock_no_listen, | |
539 | .shutdown = unix_shutdown, | |
540 | .setsockopt = sock_no_setsockopt, | |
541 | .getsockopt = sock_no_getsockopt, | |
542 | .sendmsg = unix_dgram_sendmsg, | |
543 | .recvmsg = unix_dgram_recvmsg, | |
544 | .mmap = sock_no_mmap, | |
545 | .sendpage = sock_no_sendpage, | |
546 | }; | |
547 | ||
90ddc4f0 | 548 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
549 | .family = PF_UNIX, |
550 | .owner = THIS_MODULE, | |
551 | .release = unix_release, | |
552 | .bind = unix_bind, | |
553 | .connect = unix_stream_connect, | |
554 | .socketpair = unix_socketpair, | |
555 | .accept = unix_accept, | |
556 | .getname = unix_getname, | |
ec0d215f | 557 | .poll = unix_dgram_poll, |
1da177e4 LT |
558 | .ioctl = unix_ioctl, |
559 | .listen = unix_listen, | |
560 | .shutdown = unix_shutdown, | |
561 | .setsockopt = sock_no_setsockopt, | |
562 | .getsockopt = sock_no_getsockopt, | |
563 | .sendmsg = unix_seqpacket_sendmsg, | |
564 | .recvmsg = unix_dgram_recvmsg, | |
565 | .mmap = sock_no_mmap, | |
566 | .sendpage = sock_no_sendpage, | |
567 | }; | |
568 | ||
569 | static struct proto unix_proto = { | |
248969ae ED |
570 | .name = "UNIX", |
571 | .owner = THIS_MODULE, | |
572 | .sockets_allocated = &unix_nr_socks, | |
573 | .obj_size = sizeof(struct unix_sock), | |
1da177e4 LT |
574 | }; |
575 | ||
a09785a2 IM |
576 | /* |
577 | * AF_UNIX sockets do not interact with hardware, hence they | |
578 | * dont trigger interrupts - so it's safe for them to have | |
579 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
580 | * this special lock-class by reinitializing the spinlock key: | |
581 | */ | |
582 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
583 | ||
6eba6a37 | 584 | static struct sock *unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
585 | { |
586 | struct sock *sk = NULL; | |
587 | struct unix_sock *u; | |
588 | ||
284b327b PE |
589 | atomic_inc(&unix_nr_socks); |
590 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
591 | goto out; |
592 | ||
6257ff21 | 593 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
594 | if (!sk) |
595 | goto out; | |
596 | ||
6eba6a37 | 597 | sock_init_data(sock, sk); |
a09785a2 IM |
598 | lockdep_set_class(&sk->sk_receive_queue.lock, |
599 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
600 | |
601 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 602 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
603 | sk->sk_destruct = unix_sock_destructor; |
604 | u = unix_sk(sk); | |
605 | u->dentry = NULL; | |
606 | u->mnt = NULL; | |
fd19f329 | 607 | spin_lock_init(&u->lock); |
516e0cc5 | 608 | atomic_long_set(&u->inflight, 0); |
1fd05ba5 | 609 | INIT_LIST_HEAD(&u->link); |
57b47a53 | 610 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 LT |
611 | init_waitqueue_head(&u->peer_wait); |
612 | unix_insert_socket(unix_sockets_unbound, sk); | |
613 | out: | |
284b327b PE |
614 | if (sk == NULL) |
615 | atomic_dec(&unix_nr_socks); | |
a8076d8d ED |
616 | else |
617 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
618 | ||
1da177e4 LT |
619 | return sk; |
620 | } | |
621 | ||
1b8d7ae4 | 622 | static int unix_create(struct net *net, struct socket *sock, int protocol) |
1da177e4 LT |
623 | { |
624 | if (protocol && protocol != PF_UNIX) | |
625 | return -EPROTONOSUPPORT; | |
626 | ||
627 | sock->state = SS_UNCONNECTED; | |
628 | ||
629 | switch (sock->type) { | |
630 | case SOCK_STREAM: | |
631 | sock->ops = &unix_stream_ops; | |
632 | break; | |
633 | /* | |
634 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
635 | * nothing uses it. | |
636 | */ | |
637 | case SOCK_RAW: | |
e27dfcea | 638 | sock->type = SOCK_DGRAM; |
1da177e4 LT |
639 | case SOCK_DGRAM: |
640 | sock->ops = &unix_dgram_ops; | |
641 | break; | |
642 | case SOCK_SEQPACKET: | |
643 | sock->ops = &unix_seqpacket_ops; | |
644 | break; | |
645 | default: | |
646 | return -ESOCKTNOSUPPORT; | |
647 | } | |
648 | ||
1b8d7ae4 | 649 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
650 | } |
651 | ||
652 | static int unix_release(struct socket *sock) | |
653 | { | |
654 | struct sock *sk = sock->sk; | |
655 | ||
656 | if (!sk) | |
657 | return 0; | |
658 | ||
659 | sock->sk = NULL; | |
660 | ||
6eba6a37 | 661 | return unix_release_sock(sk, 0); |
1da177e4 LT |
662 | } |
663 | ||
664 | static int unix_autobind(struct socket *sock) | |
665 | { | |
666 | struct sock *sk = sock->sk; | |
3b1e0a65 | 667 | struct net *net = sock_net(sk); |
1da177e4 LT |
668 | struct unix_sock *u = unix_sk(sk); |
669 | static u32 ordernum = 1; | |
6eba6a37 | 670 | struct unix_address *addr; |
1da177e4 LT |
671 | int err; |
672 | ||
57b47a53 | 673 | mutex_lock(&u->readlock); |
1da177e4 LT |
674 | |
675 | err = 0; | |
676 | if (u->addr) | |
677 | goto out; | |
678 | ||
679 | err = -ENOMEM; | |
0da974f4 | 680 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
681 | if (!addr) |
682 | goto out; | |
683 | ||
1da177e4 LT |
684 | addr->name->sun_family = AF_UNIX; |
685 | atomic_set(&addr->refcnt, 1); | |
686 | ||
687 | retry: | |
688 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
6eba6a37 | 689 | addr->hash = unix_hash_fold(csum_partial((void *)addr->name, addr->len, 0)); |
1da177e4 | 690 | |
fbe9cc4a | 691 | spin_lock(&unix_table_lock); |
1da177e4 LT |
692 | ordernum = (ordernum+1)&0xFFFFF; |
693 | ||
097e66c5 | 694 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 695 | addr->hash)) { |
fbe9cc4a | 696 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
697 | /* Sanity yield. It is unusual case, but yet... */ |
698 | if (!(ordernum&0xFF)) | |
699 | yield(); | |
700 | goto retry; | |
701 | } | |
702 | addr->hash ^= sk->sk_type; | |
703 | ||
704 | __unix_remove_socket(sk); | |
705 | u->addr = addr; | |
706 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 707 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
708 | err = 0; |
709 | ||
57b47a53 | 710 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
711 | return err; |
712 | } | |
713 | ||
097e66c5 DL |
714 | static struct sock *unix_find_other(struct net *net, |
715 | struct sockaddr_un *sunname, int len, | |
1da177e4 LT |
716 | int type, unsigned hash, int *error) |
717 | { | |
718 | struct sock *u; | |
421748ec | 719 | struct path path; |
1da177e4 | 720 | int err = 0; |
ac7bfa62 | 721 | |
1da177e4 | 722 | if (sunname->sun_path[0]) { |
421748ec AV |
723 | struct inode *inode; |
724 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); | |
1da177e4 LT |
725 | if (err) |
726 | goto fail; | |
421748ec AV |
727 | inode = path.dentry->d_inode; |
728 | err = inode_permission(inode, MAY_WRITE); | |
1da177e4 LT |
729 | if (err) |
730 | goto put_fail; | |
731 | ||
732 | err = -ECONNREFUSED; | |
421748ec | 733 | if (!S_ISSOCK(inode->i_mode)) |
1da177e4 | 734 | goto put_fail; |
421748ec | 735 | u = unix_find_socket_byinode(net, inode); |
1da177e4 LT |
736 | if (!u) |
737 | goto put_fail; | |
738 | ||
739 | if (u->sk_type == type) | |
421748ec | 740 | touch_atime(path.mnt, path.dentry); |
1da177e4 | 741 | |
421748ec | 742 | path_put(&path); |
1da177e4 | 743 | |
e27dfcea | 744 | err = -EPROTOTYPE; |
1da177e4 LT |
745 | if (u->sk_type != type) { |
746 | sock_put(u); | |
747 | goto fail; | |
748 | } | |
749 | } else { | |
750 | err = -ECONNREFUSED; | |
e27dfcea | 751 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
752 | if (u) { |
753 | struct dentry *dentry; | |
754 | dentry = unix_sk(u)->dentry; | |
755 | if (dentry) | |
756 | touch_atime(unix_sk(u)->mnt, dentry); | |
757 | } else | |
758 | goto fail; | |
759 | } | |
760 | return u; | |
761 | ||
762 | put_fail: | |
421748ec | 763 | path_put(&path); |
1da177e4 | 764 | fail: |
e27dfcea | 765 | *error = err; |
1da177e4 LT |
766 | return NULL; |
767 | } | |
768 | ||
769 | ||
770 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
771 | { | |
772 | struct sock *sk = sock->sk; | |
3b1e0a65 | 773 | struct net *net = sock_net(sk); |
1da177e4 | 774 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 775 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
6eba6a37 | 776 | struct dentry *dentry = NULL; |
1da177e4 LT |
777 | struct nameidata nd; |
778 | int err; | |
779 | unsigned hash; | |
780 | struct unix_address *addr; | |
781 | struct hlist_head *list; | |
782 | ||
783 | err = -EINVAL; | |
784 | if (sunaddr->sun_family != AF_UNIX) | |
785 | goto out; | |
786 | ||
e27dfcea | 787 | if (addr_len == sizeof(short)) { |
1da177e4 LT |
788 | err = unix_autobind(sock); |
789 | goto out; | |
790 | } | |
791 | ||
792 | err = unix_mkname(sunaddr, addr_len, &hash); | |
793 | if (err < 0) | |
794 | goto out; | |
795 | addr_len = err; | |
796 | ||
57b47a53 | 797 | mutex_lock(&u->readlock); |
1da177e4 LT |
798 | |
799 | err = -EINVAL; | |
800 | if (u->addr) | |
801 | goto out_up; | |
802 | ||
803 | err = -ENOMEM; | |
804 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
805 | if (!addr) | |
806 | goto out_up; | |
807 | ||
808 | memcpy(addr->name, sunaddr, addr_len); | |
809 | addr->len = addr_len; | |
810 | addr->hash = hash ^ sk->sk_type; | |
811 | atomic_set(&addr->refcnt, 1); | |
812 | ||
813 | if (sunaddr->sun_path[0]) { | |
814 | unsigned int mode; | |
815 | err = 0; | |
816 | /* | |
817 | * Get the parent directory, calculate the hash for last | |
818 | * component. | |
819 | */ | |
820 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); | |
821 | if (err) | |
822 | goto out_mknod_parent; | |
f81a0bff CH |
823 | |
824 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
825 | err = PTR_ERR(dentry); |
826 | if (IS_ERR(dentry)) | |
827 | goto out_mknod_unlock; | |
f81a0bff | 828 | |
1da177e4 LT |
829 | /* |
830 | * All right, let's create it. | |
831 | */ | |
832 | mode = S_IFSOCK | | |
833 | (SOCK_INODE(sock)->i_mode & ~current->fs->umask); | |
463c3197 DH |
834 | err = mnt_want_write(nd.path.mnt); |
835 | if (err) | |
836 | goto out_mknod_dput; | |
4ac91378 | 837 | err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0); |
463c3197 | 838 | mnt_drop_write(nd.path.mnt); |
1da177e4 LT |
839 | if (err) |
840 | goto out_mknod_dput; | |
4ac91378 JB |
841 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
842 | dput(nd.path.dentry); | |
843 | nd.path.dentry = dentry; | |
1da177e4 LT |
844 | |
845 | addr->hash = UNIX_HASH_SIZE; | |
846 | } | |
847 | ||
fbe9cc4a | 848 | spin_lock(&unix_table_lock); |
1da177e4 LT |
849 | |
850 | if (!sunaddr->sun_path[0]) { | |
851 | err = -EADDRINUSE; | |
097e66c5 | 852 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
853 | sk->sk_type, hash)) { |
854 | unix_release_addr(addr); | |
855 | goto out_unlock; | |
856 | } | |
857 | ||
858 | list = &unix_socket_table[addr->hash]; | |
859 | } else { | |
860 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; | |
4ac91378 JB |
861 | u->dentry = nd.path.dentry; |
862 | u->mnt = nd.path.mnt; | |
1da177e4 LT |
863 | } |
864 | ||
865 | err = 0; | |
866 | __unix_remove_socket(sk); | |
867 | u->addr = addr; | |
868 | __unix_insert_socket(list, sk); | |
869 | ||
870 | out_unlock: | |
fbe9cc4a | 871 | spin_unlock(&unix_table_lock); |
1da177e4 | 872 | out_up: |
57b47a53 | 873 | mutex_unlock(&u->readlock); |
1da177e4 LT |
874 | out: |
875 | return err; | |
876 | ||
877 | out_mknod_dput: | |
878 | dput(dentry); | |
879 | out_mknod_unlock: | |
4ac91378 | 880 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9b | 881 | path_put(&nd.path); |
1da177e4 | 882 | out_mknod_parent: |
e27dfcea JK |
883 | if (err == -EEXIST) |
884 | err = -EADDRINUSE; | |
1da177e4 LT |
885 | unix_release_addr(addr); |
886 | goto out_up; | |
887 | } | |
888 | ||
278a3de5 DM |
889 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
890 | { | |
891 | if (unlikely(sk1 == sk2) || !sk2) { | |
892 | unix_state_lock(sk1); | |
893 | return; | |
894 | } | |
895 | if (sk1 < sk2) { | |
896 | unix_state_lock(sk1); | |
897 | unix_state_lock_nested(sk2); | |
898 | } else { | |
899 | unix_state_lock(sk2); | |
900 | unix_state_lock_nested(sk1); | |
901 | } | |
902 | } | |
903 | ||
904 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
905 | { | |
906 | if (unlikely(sk1 == sk2) || !sk2) { | |
907 | unix_state_unlock(sk1); | |
908 | return; | |
909 | } | |
910 | unix_state_unlock(sk1); | |
911 | unix_state_unlock(sk2); | |
912 | } | |
913 | ||
1da177e4 LT |
914 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
915 | int alen, int flags) | |
916 | { | |
917 | struct sock *sk = sock->sk; | |
3b1e0a65 | 918 | struct net *net = sock_net(sk); |
e27dfcea | 919 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
1da177e4 LT |
920 | struct sock *other; |
921 | unsigned hash; | |
922 | int err; | |
923 | ||
924 | if (addr->sa_family != AF_UNSPEC) { | |
925 | err = unix_mkname(sunaddr, alen, &hash); | |
926 | if (err < 0) | |
927 | goto out; | |
928 | alen = err; | |
929 | ||
930 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
931 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
932 | goto out; | |
933 | ||
278a3de5 | 934 | restart: |
e27dfcea | 935 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
936 | if (!other) |
937 | goto out; | |
938 | ||
278a3de5 DM |
939 | unix_state_double_lock(sk, other); |
940 | ||
941 | /* Apparently VFS overslept socket death. Retry. */ | |
942 | if (sock_flag(other, SOCK_DEAD)) { | |
943 | unix_state_double_unlock(sk, other); | |
944 | sock_put(other); | |
945 | goto restart; | |
946 | } | |
1da177e4 LT |
947 | |
948 | err = -EPERM; | |
949 | if (!unix_may_send(sk, other)) | |
950 | goto out_unlock; | |
951 | ||
952 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
953 | if (err) | |
954 | goto out_unlock; | |
955 | ||
956 | } else { | |
957 | /* | |
958 | * 1003.1g breaking connected state with AF_UNSPEC | |
959 | */ | |
960 | other = NULL; | |
278a3de5 | 961 | unix_state_double_lock(sk, other); |
1da177e4 LT |
962 | } |
963 | ||
964 | /* | |
965 | * If it was connected, reconnect. | |
966 | */ | |
967 | if (unix_peer(sk)) { | |
968 | struct sock *old_peer = unix_peer(sk); | |
e27dfcea | 969 | unix_peer(sk) = other; |
278a3de5 | 970 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
971 | |
972 | if (other != old_peer) | |
973 | unix_dgram_disconnected(sk, old_peer); | |
974 | sock_put(old_peer); | |
975 | } else { | |
e27dfcea | 976 | unix_peer(sk) = other; |
278a3de5 | 977 | unix_state_double_unlock(sk, other); |
1da177e4 | 978 | } |
ac7bfa62 | 979 | return 0; |
1da177e4 LT |
980 | |
981 | out_unlock: | |
278a3de5 | 982 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
983 | sock_put(other); |
984 | out: | |
985 | return err; | |
986 | } | |
987 | ||
988 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
989 | { | |
990 | struct unix_sock *u = unix_sk(other); | |
991 | int sched; | |
992 | DEFINE_WAIT(wait); | |
993 | ||
994 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
995 | ||
996 | sched = !sock_flag(other, SOCK_DEAD) && | |
997 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
3c73419c | 998 | unix_recvq_full(other); |
1da177e4 | 999 | |
1c92b4e5 | 1000 | unix_state_unlock(other); |
1da177e4 LT |
1001 | |
1002 | if (sched) | |
1003 | timeo = schedule_timeout(timeo); | |
1004 | ||
1005 | finish_wait(&u->peer_wait, &wait); | |
1006 | return timeo; | |
1007 | } | |
1008 | ||
1009 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
1010 | int addr_len, int flags) | |
1011 | { | |
e27dfcea | 1012 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
1da177e4 | 1013 | struct sock *sk = sock->sk; |
3b1e0a65 | 1014 | struct net *net = sock_net(sk); |
1da177e4 LT |
1015 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1016 | struct sock *newsk = NULL; | |
1017 | struct sock *other = NULL; | |
1018 | struct sk_buff *skb = NULL; | |
1019 | unsigned hash; | |
1020 | int st; | |
1021 | int err; | |
1022 | long timeo; | |
1023 | ||
1024 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1025 | if (err < 0) | |
1026 | goto out; | |
1027 | addr_len = err; | |
1028 | ||
1029 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1030 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1031 | goto out; | |
1032 | ||
1033 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1034 | ||
1035 | /* First of all allocate resources. | |
1036 | If we will make it after state is locked, | |
1037 | we will have to recheck all again in any case. | |
1038 | */ | |
1039 | ||
1040 | err = -ENOMEM; | |
1041 | ||
1042 | /* create new sock for complete connection */ | |
3b1e0a65 | 1043 | newsk = unix_create1(sock_net(sk), NULL); |
1da177e4 LT |
1044 | if (newsk == NULL) |
1045 | goto out; | |
1046 | ||
1047 | /* Allocate skb for sending to listening sock */ | |
1048 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1049 | if (skb == NULL) | |
1050 | goto out; | |
1051 | ||
1052 | restart: | |
1053 | /* Find listening sock. */ | |
097e66c5 | 1054 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1055 | if (!other) |
1056 | goto out; | |
1057 | ||
1058 | /* Latch state of peer */ | |
1c92b4e5 | 1059 | unix_state_lock(other); |
1da177e4 LT |
1060 | |
1061 | /* Apparently VFS overslept socket death. Retry. */ | |
1062 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1063 | unix_state_unlock(other); |
1da177e4 LT |
1064 | sock_put(other); |
1065 | goto restart; | |
1066 | } | |
1067 | ||
1068 | err = -ECONNREFUSED; | |
1069 | if (other->sk_state != TCP_LISTEN) | |
1070 | goto out_unlock; | |
1071 | ||
3c73419c | 1072 | if (unix_recvq_full(other)) { |
1da177e4 LT |
1073 | err = -EAGAIN; |
1074 | if (!timeo) | |
1075 | goto out_unlock; | |
1076 | ||
1077 | timeo = unix_wait_for_peer(other, timeo); | |
1078 | ||
1079 | err = sock_intr_errno(timeo); | |
1080 | if (signal_pending(current)) | |
1081 | goto out; | |
1082 | sock_put(other); | |
1083 | goto restart; | |
ac7bfa62 | 1084 | } |
1da177e4 LT |
1085 | |
1086 | /* Latch our state. | |
1087 | ||
1088 | It is tricky place. We need to grab write lock and cannot | |
1089 | drop lock on peer. It is dangerous because deadlock is | |
1090 | possible. Connect to self case and simultaneous | |
1091 | attempt to connect are eliminated by checking socket | |
1092 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1093 | check this before attempt to grab lock. | |
1094 | ||
1095 | Well, and we have to recheck the state after socket locked. | |
1096 | */ | |
1097 | st = sk->sk_state; | |
1098 | ||
1099 | switch (st) { | |
1100 | case TCP_CLOSE: | |
1101 | /* This is ok... continue with connect */ | |
1102 | break; | |
1103 | case TCP_ESTABLISHED: | |
1104 | /* Socket is already connected */ | |
1105 | err = -EISCONN; | |
1106 | goto out_unlock; | |
1107 | default: | |
1108 | err = -EINVAL; | |
1109 | goto out_unlock; | |
1110 | } | |
1111 | ||
1c92b4e5 | 1112 | unix_state_lock_nested(sk); |
1da177e4 LT |
1113 | |
1114 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1115 | unix_state_unlock(sk); |
1116 | unix_state_unlock(other); | |
1da177e4 LT |
1117 | sock_put(other); |
1118 | goto restart; | |
1119 | } | |
1120 | ||
1121 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1122 | if (err) { | |
1c92b4e5 | 1123 | unix_state_unlock(sk); |
1da177e4 LT |
1124 | goto out_unlock; |
1125 | } | |
1126 | ||
1127 | /* The way is open! Fastly set all the necessary fields... */ | |
1128 | ||
1129 | sock_hold(sk); | |
1130 | unix_peer(newsk) = sk; | |
1131 | newsk->sk_state = TCP_ESTABLISHED; | |
1132 | newsk->sk_type = sk->sk_type; | |
b488893a | 1133 | newsk->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1134 | newsk->sk_peercred.uid = current->euid; |
1135 | newsk->sk_peercred.gid = current->egid; | |
1136 | newu = unix_sk(newsk); | |
1137 | newsk->sk_sleep = &newu->peer_wait; | |
1138 | otheru = unix_sk(other); | |
1139 | ||
1140 | /* copy address information from listening to new sock*/ | |
1141 | if (otheru->addr) { | |
1142 | atomic_inc(&otheru->addr->refcnt); | |
1143 | newu->addr = otheru->addr; | |
1144 | } | |
1145 | if (otheru->dentry) { | |
1146 | newu->dentry = dget(otheru->dentry); | |
1147 | newu->mnt = mntget(otheru->mnt); | |
1148 | } | |
1149 | ||
1150 | /* Set credentials */ | |
1151 | sk->sk_peercred = other->sk_peercred; | |
1152 | ||
1da177e4 LT |
1153 | sock->state = SS_CONNECTED; |
1154 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1155 | sock_hold(newsk); |
1156 | ||
1157 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1158 | unix_peer(sk) = newsk; | |
1da177e4 | 1159 | |
1c92b4e5 | 1160 | unix_state_unlock(sk); |
1da177e4 LT |
1161 | |
1162 | /* take ten and and send info to listening sock */ | |
1163 | spin_lock(&other->sk_receive_queue.lock); | |
1164 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1165 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1166 | unix_state_unlock(other); |
1da177e4 LT |
1167 | other->sk_data_ready(other, 0); |
1168 | sock_put(other); | |
1169 | return 0; | |
1170 | ||
1171 | out_unlock: | |
1172 | if (other) | |
1c92b4e5 | 1173 | unix_state_unlock(other); |
1da177e4 LT |
1174 | |
1175 | out: | |
1176 | if (skb) | |
1177 | kfree_skb(skb); | |
1178 | if (newsk) | |
1179 | unix_release_sock(newsk, 0); | |
1180 | if (other) | |
1181 | sock_put(other); | |
1182 | return err; | |
1183 | } | |
1184 | ||
1185 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1186 | { | |
e27dfcea | 1187 | struct sock *ska = socka->sk, *skb = sockb->sk; |
1da177e4 LT |
1188 | |
1189 | /* Join our sockets back to back */ | |
1190 | sock_hold(ska); | |
1191 | sock_hold(skb); | |
e27dfcea JK |
1192 | unix_peer(ska) = skb; |
1193 | unix_peer(skb) = ska; | |
b488893a | 1194 | ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current); |
1da177e4 LT |
1195 | ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid; |
1196 | ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid; | |
1197 | ||
1198 | if (ska->sk_type != SOCK_DGRAM) { | |
1199 | ska->sk_state = TCP_ESTABLISHED; | |
1200 | skb->sk_state = TCP_ESTABLISHED; | |
1201 | socka->state = SS_CONNECTED; | |
1202 | sockb->state = SS_CONNECTED; | |
1203 | } | |
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) | |
1208 | { | |
1209 | struct sock *sk = sock->sk; | |
1210 | struct sock *tsk; | |
1211 | struct sk_buff *skb; | |
1212 | int err; | |
1213 | ||
1214 | err = -EOPNOTSUPP; | |
6eba6a37 | 1215 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
1da177e4 LT |
1216 | goto out; |
1217 | ||
1218 | err = -EINVAL; | |
1219 | if (sk->sk_state != TCP_LISTEN) | |
1220 | goto out; | |
1221 | ||
1222 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1223 | * so that no locks are necessary. | |
1224 | */ | |
1225 | ||
1226 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1227 | if (!skb) { | |
1228 | /* This means receive shutdown. */ | |
1229 | if (err == 0) | |
1230 | err = -EINVAL; | |
1231 | goto out; | |
1232 | } | |
1233 | ||
1234 | tsk = skb->sk; | |
1235 | skb_free_datagram(sk, skb); | |
1236 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1237 | ||
1238 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1239 | unix_state_lock(tsk); |
1da177e4 LT |
1240 | newsock->state = SS_CONNECTED; |
1241 | sock_graft(tsk, newsock); | |
1c92b4e5 | 1242 | unix_state_unlock(tsk); |
1da177e4 LT |
1243 | return 0; |
1244 | ||
1245 | out: | |
1246 | return err; | |
1247 | } | |
1248 | ||
1249 | ||
1250 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1251 | { | |
1252 | struct sock *sk = sock->sk; | |
1253 | struct unix_sock *u; | |
e27dfcea | 1254 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
1da177e4 LT |
1255 | int err = 0; |
1256 | ||
1257 | if (peer) { | |
1258 | sk = unix_peer_get(sk); | |
1259 | ||
1260 | err = -ENOTCONN; | |
1261 | if (!sk) | |
1262 | goto out; | |
1263 | err = 0; | |
1264 | } else { | |
1265 | sock_hold(sk); | |
1266 | } | |
1267 | ||
1268 | u = unix_sk(sk); | |
1c92b4e5 | 1269 | unix_state_lock(sk); |
1da177e4 LT |
1270 | if (!u->addr) { |
1271 | sunaddr->sun_family = AF_UNIX; | |
1272 | sunaddr->sun_path[0] = 0; | |
1273 | *uaddr_len = sizeof(short); | |
1274 | } else { | |
1275 | struct unix_address *addr = u->addr; | |
1276 | ||
1277 | *uaddr_len = addr->len; | |
1278 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1279 | } | |
1c92b4e5 | 1280 | unix_state_unlock(sk); |
1da177e4 LT |
1281 | sock_put(sk); |
1282 | out: | |
1283 | return err; | |
1284 | } | |
1285 | ||
1286 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1287 | { | |
1288 | int i; | |
1289 | ||
1290 | scm->fp = UNIXCB(skb).fp; | |
1291 | skb->destructor = sock_wfree; | |
1292 | UNIXCB(skb).fp = NULL; | |
1293 | ||
6eba6a37 | 1294 | for (i = scm->fp->count-1; i >= 0; i--) |
1da177e4 LT |
1295 | unix_notinflight(scm->fp->fp[i]); |
1296 | } | |
1297 | ||
1298 | static void unix_destruct_fds(struct sk_buff *skb) | |
1299 | { | |
1300 | struct scm_cookie scm; | |
1301 | memset(&scm, 0, sizeof(scm)); | |
1302 | unix_detach_fds(&scm, skb); | |
1303 | ||
1304 | /* Alas, it calls VFS */ | |
1305 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1306 | scm_destroy(&scm); | |
1307 | sock_wfree(skb); | |
1308 | } | |
1309 | ||
6209344f | 1310 | static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
1da177e4 LT |
1311 | { |
1312 | int i; | |
6209344f MS |
1313 | |
1314 | /* | |
1315 | * Need to duplicate file references for the sake of garbage | |
1316 | * collection. Otherwise a socket in the fps might become a | |
1317 | * candidate for GC while the skb is not yet queued. | |
1318 | */ | |
1319 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); | |
1320 | if (!UNIXCB(skb).fp) | |
1321 | return -ENOMEM; | |
1322 | ||
6eba6a37 | 1323 | for (i = scm->fp->count-1; i >= 0; i--) |
1da177e4 | 1324 | unix_inflight(scm->fp->fp[i]); |
1da177e4 | 1325 | skb->destructor = unix_destruct_fds; |
6209344f | 1326 | return 0; |
1da177e4 LT |
1327 | } |
1328 | ||
1329 | /* | |
1330 | * Send AF_UNIX data. | |
1331 | */ | |
1332 | ||
1333 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1334 | struct msghdr *msg, size_t len) | |
1335 | { | |
1336 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1337 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1338 | struct net *net = sock_net(sk); |
1da177e4 | 1339 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 1340 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 LT |
1341 | struct sock *other = NULL; |
1342 | int namelen = 0; /* fake GCC */ | |
1343 | int err; | |
1344 | unsigned hash; | |
1345 | struct sk_buff *skb; | |
1346 | long timeo; | |
1347 | struct scm_cookie tmp_scm; | |
1348 | ||
1349 | if (NULL == siocb->scm) | |
1350 | siocb->scm = &tmp_scm; | |
1351 | err = scm_send(sock, msg, siocb->scm); | |
1352 | if (err < 0) | |
1353 | return err; | |
1354 | ||
1355 | err = -EOPNOTSUPP; | |
1356 | if (msg->msg_flags&MSG_OOB) | |
1357 | goto out; | |
1358 | ||
1359 | if (msg->msg_namelen) { | |
1360 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1361 | if (err < 0) | |
1362 | goto out; | |
1363 | namelen = err; | |
1364 | } else { | |
1365 | sunaddr = NULL; | |
1366 | err = -ENOTCONN; | |
1367 | other = unix_peer_get(sk); | |
1368 | if (!other) | |
1369 | goto out; | |
1370 | } | |
1371 | ||
1372 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1373 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1374 | goto out; | |
1375 | ||
1376 | err = -EMSGSIZE; | |
1377 | if (len > sk->sk_sndbuf - 32) | |
1378 | goto out; | |
1379 | ||
1380 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); | |
e27dfcea | 1381 | if (skb == NULL) |
1da177e4 LT |
1382 | goto out; |
1383 | ||
1384 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
6209344f MS |
1385 | if (siocb->scm->fp) { |
1386 | err = unix_attach_fds(siocb->scm, skb); | |
1387 | if (err) | |
1388 | goto out_free; | |
1389 | } | |
dc49c1f9 | 1390 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1391 | |
badff6d0 | 1392 | skb_reset_transport_header(skb); |
6eba6a37 | 1393 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
1394 | if (err) |
1395 | goto out_free; | |
1396 | ||
1397 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1398 | ||
1399 | restart: | |
1400 | if (!other) { | |
1401 | err = -ECONNRESET; | |
1402 | if (sunaddr == NULL) | |
1403 | goto out_free; | |
1404 | ||
097e66c5 | 1405 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 | 1406 | hash, &err); |
e27dfcea | 1407 | if (other == NULL) |
1da177e4 LT |
1408 | goto out_free; |
1409 | } | |
1410 | ||
1c92b4e5 | 1411 | unix_state_lock(other); |
1da177e4 LT |
1412 | err = -EPERM; |
1413 | if (!unix_may_send(sk, other)) | |
1414 | goto out_unlock; | |
1415 | ||
1416 | if (sock_flag(other, SOCK_DEAD)) { | |
1417 | /* | |
1418 | * Check with 1003.1g - what should | |
1419 | * datagram error | |
1420 | */ | |
1c92b4e5 | 1421 | unix_state_unlock(other); |
1da177e4 LT |
1422 | sock_put(other); |
1423 | ||
1424 | err = 0; | |
1c92b4e5 | 1425 | unix_state_lock(sk); |
1da177e4 | 1426 | if (unix_peer(sk) == other) { |
e27dfcea | 1427 | unix_peer(sk) = NULL; |
1c92b4e5 | 1428 | unix_state_unlock(sk); |
1da177e4 LT |
1429 | |
1430 | unix_dgram_disconnected(sk, other); | |
1431 | sock_put(other); | |
1432 | err = -ECONNREFUSED; | |
1433 | } else { | |
1c92b4e5 | 1434 | unix_state_unlock(sk); |
1da177e4 LT |
1435 | } |
1436 | ||
1437 | other = NULL; | |
1438 | if (err) | |
1439 | goto out_free; | |
1440 | goto restart; | |
1441 | } | |
1442 | ||
1443 | err = -EPIPE; | |
1444 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1445 | goto out_unlock; | |
1446 | ||
1447 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1448 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1449 | if (err) | |
1450 | goto out_unlock; | |
1451 | } | |
1452 | ||
3c73419c | 1453 | if (unix_peer(other) != sk && unix_recvq_full(other)) { |
1da177e4 LT |
1454 | if (!timeo) { |
1455 | err = -EAGAIN; | |
1456 | goto out_unlock; | |
1457 | } | |
1458 | ||
1459 | timeo = unix_wait_for_peer(other, timeo); | |
1460 | ||
1461 | err = sock_intr_errno(timeo); | |
1462 | if (signal_pending(current)) | |
1463 | goto out_free; | |
1464 | ||
1465 | goto restart; | |
1466 | } | |
1467 | ||
1468 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1469 | unix_state_unlock(other); |
1da177e4 LT |
1470 | other->sk_data_ready(other, len); |
1471 | sock_put(other); | |
1472 | scm_destroy(siocb->scm); | |
1473 | return len; | |
1474 | ||
1475 | out_unlock: | |
1c92b4e5 | 1476 | unix_state_unlock(other); |
1da177e4 LT |
1477 | out_free: |
1478 | kfree_skb(skb); | |
1479 | out: | |
1480 | if (other) | |
1481 | sock_put(other); | |
1482 | scm_destroy(siocb->scm); | |
1483 | return err; | |
1484 | } | |
1485 | ||
ac7bfa62 | 1486 | |
1da177e4 LT |
1487 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
1488 | struct msghdr *msg, size_t len) | |
1489 | { | |
1490 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1491 | struct sock *sk = sock->sk; | |
1492 | struct sock *other = NULL; | |
e27dfcea | 1493 | struct sockaddr_un *sunaddr = msg->msg_name; |
6eba6a37 | 1494 | int err, size; |
1da177e4 | 1495 | struct sk_buff *skb; |
e27dfcea | 1496 | int sent = 0; |
1da177e4 LT |
1497 | struct scm_cookie tmp_scm; |
1498 | ||
1499 | if (NULL == siocb->scm) | |
1500 | siocb->scm = &tmp_scm; | |
1501 | err = scm_send(sock, msg, siocb->scm); | |
1502 | if (err < 0) | |
1503 | return err; | |
1504 | ||
1505 | err = -EOPNOTSUPP; | |
1506 | if (msg->msg_flags&MSG_OOB) | |
1507 | goto out_err; | |
1508 | ||
1509 | if (msg->msg_namelen) { | |
1510 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1511 | goto out_err; | |
1512 | } else { | |
1513 | sunaddr = NULL; | |
1514 | err = -ENOTCONN; | |
830a1e5c | 1515 | other = unix_peer(sk); |
1da177e4 LT |
1516 | if (!other) |
1517 | goto out_err; | |
1518 | } | |
1519 | ||
1520 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1521 | goto pipe_err; | |
1522 | ||
6eba6a37 | 1523 | while (sent < len) { |
1da177e4 | 1524 | /* |
e9df7d7f BL |
1525 | * Optimisation for the fact that under 0.01% of X |
1526 | * messages typically need breaking up. | |
1da177e4 LT |
1527 | */ |
1528 | ||
e9df7d7f | 1529 | size = len-sent; |
1da177e4 LT |
1530 | |
1531 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1532 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1533 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1534 | |
1535 | if (size > SKB_MAX_ALLOC) | |
1536 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1537 | |
1da177e4 LT |
1538 | /* |
1539 | * Grab a buffer | |
1540 | */ | |
ac7bfa62 | 1541 | |
6eba6a37 ED |
1542 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, |
1543 | &err); | |
1da177e4 | 1544 | |
e27dfcea | 1545 | if (skb == NULL) |
1da177e4 LT |
1546 | goto out_err; |
1547 | ||
1548 | /* | |
1549 | * If you pass two values to the sock_alloc_send_skb | |
1550 | * it tries to grab the large buffer with GFP_NOFS | |
1551 | * (which can fail easily), and if it fails grab the | |
1552 | * fallback size buffer which is under a page and will | |
1553 | * succeed. [Alan] | |
1554 | */ | |
1555 | size = min_t(int, size, skb_tailroom(skb)); | |
1556 | ||
1557 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
6209344f MS |
1558 | if (siocb->scm->fp) { |
1559 | err = unix_attach_fds(siocb->scm, skb); | |
1560 | if (err) { | |
1561 | kfree_skb(skb); | |
1562 | goto out_err; | |
1563 | } | |
1564 | } | |
1da177e4 | 1565 | |
6eba6a37 ED |
1566 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
1567 | if (err) { | |
1da177e4 LT |
1568 | kfree_skb(skb); |
1569 | goto out_err; | |
1570 | } | |
1571 | ||
1c92b4e5 | 1572 | unix_state_lock(other); |
1da177e4 LT |
1573 | |
1574 | if (sock_flag(other, SOCK_DEAD) || | |
1575 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1576 | goto pipe_err_free; | |
1577 | ||
1578 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1579 | unix_state_unlock(other); |
1da177e4 | 1580 | other->sk_data_ready(other, size); |
e27dfcea | 1581 | sent += size; |
1da177e4 | 1582 | } |
1da177e4 LT |
1583 | |
1584 | scm_destroy(siocb->scm); | |
1585 | siocb->scm = NULL; | |
1586 | ||
1587 | return sent; | |
1588 | ||
1589 | pipe_err_free: | |
1c92b4e5 | 1590 | unix_state_unlock(other); |
1da177e4 LT |
1591 | kfree_skb(skb); |
1592 | pipe_err: | |
6eba6a37 ED |
1593 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
1594 | send_sig(SIGPIPE, current, 0); | |
1da177e4 LT |
1595 | err = -EPIPE; |
1596 | out_err: | |
1da177e4 LT |
1597 | scm_destroy(siocb->scm); |
1598 | siocb->scm = NULL; | |
1599 | return sent ? : err; | |
1600 | } | |
1601 | ||
1602 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1603 | struct msghdr *msg, size_t len) | |
1604 | { | |
1605 | int err; | |
1606 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1607 | |
1da177e4 LT |
1608 | err = sock_error(sk); |
1609 | if (err) | |
1610 | return err; | |
1611 | ||
1612 | if (sk->sk_state != TCP_ESTABLISHED) | |
1613 | return -ENOTCONN; | |
1614 | ||
1615 | if (msg->msg_namelen) | |
1616 | msg->msg_namelen = 0; | |
1617 | ||
1618 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
1619 | } | |
ac7bfa62 | 1620 | |
1da177e4 LT |
1621 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
1622 | { | |
1623 | struct unix_sock *u = unix_sk(sk); | |
1624 | ||
1625 | msg->msg_namelen = 0; | |
1626 | if (u->addr) { | |
1627 | msg->msg_namelen = u->addr->len; | |
1628 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1629 | } | |
1630 | } | |
1631 | ||
1632 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1633 | struct msghdr *msg, size_t size, | |
1634 | int flags) | |
1635 | { | |
1636 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1637 | struct scm_cookie tmp_scm; | |
1638 | struct sock *sk = sock->sk; | |
1639 | struct unix_sock *u = unix_sk(sk); | |
1640 | int noblock = flags & MSG_DONTWAIT; | |
1641 | struct sk_buff *skb; | |
1642 | int err; | |
1643 | ||
1644 | err = -EOPNOTSUPP; | |
1645 | if (flags&MSG_OOB) | |
1646 | goto out; | |
1647 | ||
1648 | msg->msg_namelen = 0; | |
1649 | ||
57b47a53 | 1650 | mutex_lock(&u->readlock); |
1da177e4 LT |
1651 | |
1652 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
0a112258 FZ |
1653 | if (!skb) { |
1654 | unix_state_lock(sk); | |
1655 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
1656 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
1657 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1658 | err = 0; | |
1659 | unix_state_unlock(sk); | |
1da177e4 | 1660 | goto out_unlock; |
0a112258 | 1661 | } |
1da177e4 | 1662 | |
71e20f18 | 1663 | wake_up_interruptible_sync(&u->peer_wait); |
1da177e4 LT |
1664 | |
1665 | if (msg->msg_name) | |
1666 | unix_copy_addr(msg, skb->sk); | |
1667 | ||
1668 | if (size > skb->len) | |
1669 | size = skb->len; | |
1670 | else if (size < skb->len) | |
1671 | msg->msg_flags |= MSG_TRUNC; | |
1672 | ||
1673 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); | |
1674 | if (err) | |
1675 | goto out_free; | |
1676 | ||
1677 | if (!siocb->scm) { | |
1678 | siocb->scm = &tmp_scm; | |
1679 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1680 | } | |
1681 | siocb->scm->creds = *UNIXCREDS(skb); | |
877ce7c1 | 1682 | unix_set_secdata(siocb->scm, skb); |
1da177e4 | 1683 | |
6eba6a37 | 1684 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
1685 | if (UNIXCB(skb).fp) |
1686 | unix_detach_fds(siocb->scm, skb); | |
6eba6a37 | 1687 | } else { |
1da177e4 LT |
1688 | /* It is questionable: on PEEK we could: |
1689 | - do not return fds - good, but too simple 8) | |
1690 | - return fds, and do not return them on read (old strategy, | |
1691 | apparently wrong) | |
1692 | - clone fds (I chose it for now, it is the most universal | |
1693 | solution) | |
ac7bfa62 YH |
1694 | |
1695 | POSIX 1003.1g does not actually define this clearly | |
1696 | at all. POSIX 1003.1g doesn't define a lot of things | |
1697 | clearly however! | |
1698 | ||
1da177e4 LT |
1699 | */ |
1700 | if (UNIXCB(skb).fp) | |
1701 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1702 | } | |
1703 | err = size; | |
1704 | ||
1705 | scm_recv(sock, msg, siocb->scm, flags); | |
1706 | ||
1707 | out_free: | |
6eba6a37 | 1708 | skb_free_datagram(sk, skb); |
1da177e4 | 1709 | out_unlock: |
57b47a53 | 1710 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1711 | out: |
1712 | return err; | |
1713 | } | |
1714 | ||
1715 | /* | |
1716 | * Sleep until data has arrive. But check for races.. | |
1717 | */ | |
ac7bfa62 | 1718 | |
6eba6a37 | 1719 | static long unix_stream_data_wait(struct sock *sk, long timeo) |
1da177e4 LT |
1720 | { |
1721 | DEFINE_WAIT(wait); | |
1722 | ||
1c92b4e5 | 1723 | unix_state_lock(sk); |
1da177e4 LT |
1724 | |
1725 | for (;;) { | |
1726 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1727 | ||
b03efcfb | 1728 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
1729 | sk->sk_err || |
1730 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1731 | signal_pending(current) || | |
1732 | !timeo) | |
1733 | break; | |
1734 | ||
1735 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 1736 | unix_state_unlock(sk); |
1da177e4 | 1737 | timeo = schedule_timeout(timeo); |
1c92b4e5 | 1738 | unix_state_lock(sk); |
1da177e4 LT |
1739 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1740 | } | |
1741 | ||
1742 | finish_wait(sk->sk_sleep, &wait); | |
1c92b4e5 | 1743 | unix_state_unlock(sk); |
1da177e4 LT |
1744 | return timeo; |
1745 | } | |
1746 | ||
1747 | ||
1748 | ||
1749 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1750 | struct msghdr *msg, size_t size, | |
1751 | int flags) | |
1752 | { | |
1753 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1754 | struct scm_cookie tmp_scm; | |
1755 | struct sock *sk = sock->sk; | |
1756 | struct unix_sock *u = unix_sk(sk); | |
e27dfcea | 1757 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 LT |
1758 | int copied = 0; |
1759 | int check_creds = 0; | |
1760 | int target; | |
1761 | int err = 0; | |
1762 | long timeo; | |
1763 | ||
1764 | err = -EINVAL; | |
1765 | if (sk->sk_state != TCP_ESTABLISHED) | |
1766 | goto out; | |
1767 | ||
1768 | err = -EOPNOTSUPP; | |
1769 | if (flags&MSG_OOB) | |
1770 | goto out; | |
1771 | ||
1772 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
1773 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
1774 | ||
1775 | msg->msg_namelen = 0; | |
1776 | ||
1777 | /* Lock the socket to prevent queue disordering | |
1778 | * while sleeps in memcpy_tomsg | |
1779 | */ | |
1780 | ||
1781 | if (!siocb->scm) { | |
1782 | siocb->scm = &tmp_scm; | |
1783 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1784 | } | |
1785 | ||
57b47a53 | 1786 | mutex_lock(&u->readlock); |
1da177e4 | 1787 | |
6eba6a37 | 1788 | do { |
1da177e4 LT |
1789 | int chunk; |
1790 | struct sk_buff *skb; | |
1791 | ||
3c0d2f37 | 1792 | unix_state_lock(sk); |
1da177e4 | 1793 | skb = skb_dequeue(&sk->sk_receive_queue); |
6eba6a37 | 1794 | if (skb == NULL) { |
1da177e4 | 1795 | if (copied >= target) |
3c0d2f37 | 1796 | goto unlock; |
1da177e4 LT |
1797 | |
1798 | /* | |
1799 | * POSIX 1003.1g mandates this order. | |
1800 | */ | |
ac7bfa62 | 1801 | |
6eba6a37 ED |
1802 | err = sock_error(sk); |
1803 | if (err) | |
3c0d2f37 | 1804 | goto unlock; |
1da177e4 | 1805 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
1806 | goto unlock; |
1807 | ||
1808 | unix_state_unlock(sk); | |
1da177e4 LT |
1809 | err = -EAGAIN; |
1810 | if (!timeo) | |
1811 | break; | |
57b47a53 | 1812 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1813 | |
1814 | timeo = unix_stream_data_wait(sk, timeo); | |
1815 | ||
1816 | if (signal_pending(current)) { | |
1817 | err = sock_intr_errno(timeo); | |
1818 | goto out; | |
1819 | } | |
57b47a53 | 1820 | mutex_lock(&u->readlock); |
1da177e4 | 1821 | continue; |
3c0d2f37 MS |
1822 | unlock: |
1823 | unix_state_unlock(sk); | |
1824 | break; | |
1da177e4 | 1825 | } |
3c0d2f37 | 1826 | unix_state_unlock(sk); |
1da177e4 LT |
1827 | |
1828 | if (check_creds) { | |
1829 | /* Never glue messages from different writers */ | |
6eba6a37 ED |
1830 | if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, |
1831 | sizeof(siocb->scm->creds)) != 0) { | |
1da177e4 LT |
1832 | skb_queue_head(&sk->sk_receive_queue, skb); |
1833 | break; | |
1834 | } | |
1835 | } else { | |
1836 | /* Copy credentials */ | |
1837 | siocb->scm->creds = *UNIXCREDS(skb); | |
1838 | check_creds = 1; | |
1839 | } | |
1840 | ||
1841 | /* Copy address just once */ | |
6eba6a37 | 1842 | if (sunaddr) { |
1da177e4 LT |
1843 | unix_copy_addr(msg, skb->sk); |
1844 | sunaddr = NULL; | |
1845 | } | |
1846 | ||
1847 | chunk = min_t(unsigned int, skb->len, size); | |
1848 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
1849 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1850 | if (copied == 0) | |
1851 | copied = -EFAULT; | |
1852 | break; | |
1853 | } | |
1854 | copied += chunk; | |
1855 | size -= chunk; | |
1856 | ||
1857 | /* Mark read part of skb as used */ | |
6eba6a37 | 1858 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
1859 | skb_pull(skb, chunk); |
1860 | ||
1861 | if (UNIXCB(skb).fp) | |
1862 | unix_detach_fds(siocb->scm, skb); | |
1863 | ||
1864 | /* put the skb back if we didn't use it up.. */ | |
6eba6a37 | 1865 | if (skb->len) { |
1da177e4 LT |
1866 | skb_queue_head(&sk->sk_receive_queue, skb); |
1867 | break; | |
1868 | } | |
1869 | ||
1870 | kfree_skb(skb); | |
1871 | ||
1872 | if (siocb->scm->fp) | |
1873 | break; | |
6eba6a37 | 1874 | } else { |
1da177e4 LT |
1875 | /* It is questionable, see note in unix_dgram_recvmsg. |
1876 | */ | |
1877 | if (UNIXCB(skb).fp) | |
1878 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1879 | ||
1880 | /* put message back and return */ | |
1881 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1882 | break; | |
1883 | } | |
1884 | } while (size); | |
1885 | ||
57b47a53 | 1886 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1887 | scm_recv(sock, msg, siocb->scm, flags); |
1888 | out: | |
1889 | return copied ? : err; | |
1890 | } | |
1891 | ||
1892 | static int unix_shutdown(struct socket *sock, int mode) | |
1893 | { | |
1894 | struct sock *sk = sock->sk; | |
1895 | struct sock *other; | |
1896 | ||
1897 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); | |
1898 | ||
1899 | if (mode) { | |
1c92b4e5 | 1900 | unix_state_lock(sk); |
1da177e4 | 1901 | sk->sk_shutdown |= mode; |
e27dfcea | 1902 | other = unix_peer(sk); |
1da177e4 LT |
1903 | if (other) |
1904 | sock_hold(other); | |
1c92b4e5 | 1905 | unix_state_unlock(sk); |
1da177e4 LT |
1906 | sk->sk_state_change(sk); |
1907 | ||
1908 | if (other && | |
1909 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
1910 | ||
1911 | int peer_mode = 0; | |
1912 | ||
1913 | if (mode&RCV_SHUTDOWN) | |
1914 | peer_mode |= SEND_SHUTDOWN; | |
1915 | if (mode&SEND_SHUTDOWN) | |
1916 | peer_mode |= RCV_SHUTDOWN; | |
1c92b4e5 | 1917 | unix_state_lock(other); |
1da177e4 | 1918 | other->sk_shutdown |= peer_mode; |
1c92b4e5 | 1919 | unix_state_unlock(other); |
1da177e4 LT |
1920 | other->sk_state_change(other); |
1921 | read_lock(&other->sk_callback_lock); | |
1922 | if (peer_mode == SHUTDOWN_MASK) | |
8d8ad9d7 | 1923 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 | 1924 | else if (peer_mode & RCV_SHUTDOWN) |
8d8ad9d7 | 1925 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1926 | read_unlock(&other->sk_callback_lock); |
1927 | } | |
1928 | if (other) | |
1929 | sock_put(other); | |
1930 | } | |
1931 | return 0; | |
1932 | } | |
1933 | ||
1934 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1935 | { | |
1936 | struct sock *sk = sock->sk; | |
e27dfcea | 1937 | long amount = 0; |
1da177e4 LT |
1938 | int err; |
1939 | ||
6eba6a37 ED |
1940 | switch (cmd) { |
1941 | case SIOCOUTQ: | |
1942 | amount = atomic_read(&sk->sk_wmem_alloc); | |
1943 | err = put_user(amount, (int __user *)arg); | |
1944 | break; | |
1945 | case SIOCINQ: | |
1da177e4 LT |
1946 | { |
1947 | struct sk_buff *skb; | |
1948 | ||
1949 | if (sk->sk_state == TCP_LISTEN) { | |
1950 | err = -EINVAL; | |
1951 | break; | |
1952 | } | |
1953 | ||
1954 | spin_lock(&sk->sk_receive_queue.lock); | |
1955 | if (sk->sk_type == SOCK_STREAM || | |
1956 | sk->sk_type == SOCK_SEQPACKET) { | |
1957 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
1958 | amount += skb->len; | |
1959 | } else { | |
1960 | skb = skb_peek(&sk->sk_receive_queue); | |
1961 | if (skb) | |
e27dfcea | 1962 | amount = skb->len; |
1da177e4 LT |
1963 | } |
1964 | spin_unlock(&sk->sk_receive_queue.lock); | |
1965 | err = put_user(amount, (int __user *)arg); | |
1966 | break; | |
1967 | } | |
1968 | ||
6eba6a37 ED |
1969 | default: |
1970 | err = -ENOIOCTLCMD; | |
1971 | break; | |
1da177e4 LT |
1972 | } |
1973 | return err; | |
1974 | } | |
1975 | ||
6eba6a37 | 1976 | static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 LT |
1977 | { |
1978 | struct sock *sk = sock->sk; | |
1979 | unsigned int mask; | |
1980 | ||
1981 | poll_wait(file, sk->sk_sleep, wait); | |
1982 | mask = 0; | |
1983 | ||
1984 | /* exceptional events? */ | |
1985 | if (sk->sk_err) | |
1986 | mask |= POLLERR; | |
1987 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1988 | mask |= POLLHUP; | |
f348d70a DL |
1989 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
1990 | mask |= POLLRDHUP; | |
1da177e4 LT |
1991 | |
1992 | /* readable? */ | |
1993 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1994 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1995 | mask |= POLLIN | POLLRDNORM; | |
1996 | ||
1997 | /* Connection-based need to check for termination and startup */ | |
6eba6a37 ED |
1998 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
1999 | sk->sk_state == TCP_CLOSE) | |
1da177e4 LT |
2000 | mask |= POLLHUP; |
2001 | ||
2002 | /* | |
2003 | * we set writable also when the other side has shut down the | |
2004 | * connection. This prevents stuck sockets. | |
2005 | */ | |
2006 | if (unix_writable(sk)) | |
2007 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
2008 | ||
2009 | return mask; | |
2010 | } | |
2011 | ||
ec0d215f RW |
2012 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
2013 | poll_table *wait) | |
3c73419c | 2014 | { |
ec0d215f RW |
2015 | struct sock *sk = sock->sk, *other; |
2016 | unsigned int mask, writable; | |
3c73419c RW |
2017 | |
2018 | poll_wait(file, sk->sk_sleep, wait); | |
3c73419c RW |
2019 | mask = 0; |
2020 | ||
2021 | /* exceptional events? */ | |
2022 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
2023 | mask |= POLLERR; | |
2024 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2025 | mask |= POLLRDHUP; | |
2026 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
2027 | mask |= POLLHUP; | |
2028 | ||
2029 | /* readable? */ | |
2030 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
2031 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
2032 | mask |= POLLIN | POLLRDNORM; | |
2033 | ||
2034 | /* Connection-based need to check for termination and startup */ | |
2035 | if (sk->sk_type == SOCK_SEQPACKET) { | |
2036 | if (sk->sk_state == TCP_CLOSE) | |
2037 | mask |= POLLHUP; | |
2038 | /* connection hasn't started yet? */ | |
2039 | if (sk->sk_state == TCP_SYN_SENT) | |
2040 | return mask; | |
2041 | } | |
2042 | ||
2043 | /* writable? */ | |
ec0d215f RW |
2044 | writable = unix_writable(sk); |
2045 | if (writable) { | |
2046 | other = unix_peer_get(sk); | |
2047 | if (other) { | |
2048 | if (unix_peer(other) != sk) { | |
2049 | poll_wait(file, &unix_sk(other)->peer_wait, | |
2050 | wait); | |
2051 | if (unix_recvq_full(other)) | |
2052 | writable = 0; | |
2053 | } | |
2054 | ||
2055 | sock_put(other); | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | if (writable) | |
3c73419c RW |
2060 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
2061 | else | |
2062 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
2063 | ||
3c73419c RW |
2064 | return mask; |
2065 | } | |
1da177e4 LT |
2066 | |
2067 | #ifdef CONFIG_PROC_FS | |
a53eb3fe PE |
2068 | static struct sock *first_unix_socket(int *i) |
2069 | { | |
2070 | for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2071 | if (!hlist_empty(&unix_socket_table[*i])) | |
2072 | return __sk_head(&unix_socket_table[*i]); | |
2073 | } | |
2074 | return NULL; | |
2075 | } | |
2076 | ||
2077 | static struct sock *next_unix_socket(int *i, struct sock *s) | |
2078 | { | |
2079 | struct sock *next = sk_next(s); | |
2080 | /* More in this chain? */ | |
2081 | if (next) | |
2082 | return next; | |
2083 | /* Look for next non-empty chain. */ | |
2084 | for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2085 | if (!hlist_empty(&unix_socket_table[*i])) | |
2086 | return __sk_head(&unix_socket_table[*i]); | |
2087 | } | |
2088 | return NULL; | |
2089 | } | |
2090 | ||
097e66c5 | 2091 | struct unix_iter_state { |
e372c414 | 2092 | struct seq_net_private p; |
097e66c5 DL |
2093 | int i; |
2094 | }; | |
e27dfcea | 2095 | |
1218854a | 2096 | static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 2097 | { |
1218854a | 2098 | struct unix_iter_state *iter = seq->private; |
1da177e4 LT |
2099 | loff_t off = 0; |
2100 | struct sock *s; | |
2101 | ||
097e66c5 | 2102 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
1218854a | 2103 | if (sock_net(s) != seq_file_net(seq)) |
097e66c5 | 2104 | continue; |
ac7bfa62 | 2105 | if (off == pos) |
1da177e4 LT |
2106 | return s; |
2107 | ++off; | |
2108 | } | |
2109 | return NULL; | |
2110 | } | |
2111 | ||
1da177e4 | 2112 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2113 | __acquires(unix_table_lock) |
1da177e4 | 2114 | { |
fbe9cc4a | 2115 | spin_lock(&unix_table_lock); |
b9f3124f | 2116 | return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2117 | } |
2118 | ||
2119 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2120 | { | |
097e66c5 DL |
2121 | struct unix_iter_state *iter = seq->private; |
2122 | struct sock *sk = v; | |
1da177e4 LT |
2123 | ++*pos; |
2124 | ||
b9f3124f | 2125 | if (v == SEQ_START_TOKEN) |
097e66c5 DL |
2126 | sk = first_unix_socket(&iter->i); |
2127 | else | |
2128 | sk = next_unix_socket(&iter->i, sk); | |
1218854a | 2129 | while (sk && (sock_net(sk) != seq_file_net(seq))) |
097e66c5 DL |
2130 | sk = next_unix_socket(&iter->i, sk); |
2131 | return sk; | |
1da177e4 LT |
2132 | } |
2133 | ||
2134 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2135 | __releases(unix_table_lock) |
1da177e4 | 2136 | { |
fbe9cc4a | 2137 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2138 | } |
2139 | ||
2140 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2141 | { | |
ac7bfa62 | 2142 | |
b9f3124f | 2143 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2144 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2145 | "Inode Path\n"); | |
2146 | else { | |
2147 | struct sock *s = v; | |
2148 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2149 | unix_state_lock(s); |
1da177e4 LT |
2150 | |
2151 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", | |
2152 | s, | |
2153 | atomic_read(&s->sk_refcnt), | |
2154 | 0, | |
2155 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2156 | s->sk_type, | |
2157 | s->sk_socket ? | |
2158 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2159 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2160 | sock_i_ino(s)); | |
2161 | ||
2162 | if (u->addr) { | |
2163 | int i, len; | |
2164 | seq_putc(seq, ' '); | |
2165 | ||
2166 | i = 0; | |
2167 | len = u->addr->len - sizeof(short); | |
2168 | if (!UNIX_ABSTRACT(s)) | |
2169 | len--; | |
2170 | else { | |
2171 | seq_putc(seq, '@'); | |
2172 | i++; | |
2173 | } | |
2174 | for ( ; i < len; i++) | |
2175 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2176 | } | |
1c92b4e5 | 2177 | unix_state_unlock(s); |
1da177e4 LT |
2178 | seq_putc(seq, '\n'); |
2179 | } | |
2180 | ||
2181 | return 0; | |
2182 | } | |
2183 | ||
56b3d975 | 2184 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2185 | .start = unix_seq_start, |
2186 | .next = unix_seq_next, | |
2187 | .stop = unix_seq_stop, | |
2188 | .show = unix_seq_show, | |
2189 | }; | |
2190 | ||
1da177e4 LT |
2191 | static int unix_seq_open(struct inode *inode, struct file *file) |
2192 | { | |
e372c414 DL |
2193 | return seq_open_net(inode, file, &unix_seq_ops, |
2194 | sizeof(struct unix_iter_state)); | |
1da177e4 LT |
2195 | } |
2196 | ||
da7071d7 | 2197 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2198 | .owner = THIS_MODULE, |
2199 | .open = unix_seq_open, | |
2200 | .read = seq_read, | |
2201 | .llseek = seq_lseek, | |
e372c414 | 2202 | .release = seq_release_net, |
1da177e4 LT |
2203 | }; |
2204 | ||
2205 | #endif | |
2206 | ||
2207 | static struct net_proto_family unix_family_ops = { | |
2208 | .family = PF_UNIX, | |
2209 | .create = unix_create, | |
2210 | .owner = THIS_MODULE, | |
2211 | }; | |
2212 | ||
097e66c5 DL |
2213 | |
2214 | static int unix_net_init(struct net *net) | |
2215 | { | |
2216 | int error = -ENOMEM; | |
2217 | ||
a0a53c8b | 2218 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2219 | if (unix_sysctl_register(net)) |
2220 | goto out; | |
d392e497 | 2221 | |
097e66c5 | 2222 | #ifdef CONFIG_PROC_FS |
1597fbc0 PE |
2223 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) { |
2224 | unix_sysctl_unregister(net); | |
097e66c5 | 2225 | goto out; |
1597fbc0 | 2226 | } |
097e66c5 DL |
2227 | #endif |
2228 | error = 0; | |
2229 | out: | |
48dcc33e | 2230 | return error; |
097e66c5 DL |
2231 | } |
2232 | ||
2233 | static void unix_net_exit(struct net *net) | |
2234 | { | |
1597fbc0 | 2235 | unix_sysctl_unregister(net); |
097e66c5 DL |
2236 | proc_net_remove(net, "unix"); |
2237 | } | |
2238 | ||
2239 | static struct pernet_operations unix_net_ops = { | |
2240 | .init = unix_net_init, | |
2241 | .exit = unix_net_exit, | |
2242 | }; | |
2243 | ||
1da177e4 LT |
2244 | static int __init af_unix_init(void) |
2245 | { | |
2246 | int rc = -1; | |
2247 | struct sk_buff *dummy_skb; | |
2248 | ||
ef047f5e | 2249 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
2250 | |
2251 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2252 | if (rc != 0) { |
2253 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
0dc47877 | 2254 | __func__); |
1da177e4 LT |
2255 | goto out; |
2256 | } | |
2257 | ||
2258 | sock_register(&unix_family_ops); | |
097e66c5 | 2259 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2260 | out: |
2261 | return rc; | |
2262 | } | |
2263 | ||
2264 | static void __exit af_unix_exit(void) | |
2265 | { | |
2266 | sock_unregister(PF_UNIX); | |
1da177e4 | 2267 | proto_unregister(&unix_proto); |
097e66c5 | 2268 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2269 | } |
2270 | ||
3d366960 DW |
2271 | /* Earlier than device_initcall() so that other drivers invoking |
2272 | request_module() don't end up in a loop when modprobe tries | |
2273 | to use a UNIX socket. But later than subsys_initcall() because | |
2274 | we depend on stuff initialised there */ | |
2275 | fs_initcall(af_unix_init); | |
1da177e4 LT |
2276 | module_exit(af_unix_exit); |
2277 | ||
2278 | MODULE_LICENSE("GPL"); | |
2279 | MODULE_ALIAS_NETPROTO(PF_UNIX); |