Commit | Line | Data |
---|---|---|
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> | |
6fa3eb70 S |
117 | #include <linux/freezer.h> |
118 | ||
119 | ||
120 | #include <linux/uio.h> | |
121 | #include <linux/blkdev.h> | |
122 | #include <linux/compat.h> | |
123 | #include <linux/rtc.h> | |
124 | #include <asm/kmap_types.h> | |
125 | #include <linux/device.h> | |
126 | ||
1da177e4 | 127 | |
7123aaa3 | 128 | struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; |
fa7ff56f PE |
129 | EXPORT_SYMBOL_GPL(unix_socket_table); |
130 | DEFINE_SPINLOCK(unix_table_lock); | |
131 | EXPORT_SYMBOL_GPL(unix_table_lock); | |
518de9b3 | 132 | static atomic_long_t unix_nr_socks; |
1da177e4 | 133 | |
1da177e4 | 134 | |
7123aaa3 ED |
135 | static struct hlist_head *unix_sockets_unbound(void *addr) |
136 | { | |
137 | unsigned long hash = (unsigned long)addr; | |
138 | ||
139 | hash ^= hash >> 16; | |
140 | hash ^= hash >> 8; | |
141 | hash %= UNIX_HASH_SIZE; | |
142 | return &unix_socket_table[UNIX_HASH_SIZE + hash]; | |
143 | } | |
144 | ||
145 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash < UNIX_HASH_SIZE) | |
1da177e4 | 146 | |
6fa3eb70 S |
147 | |
148 | //for aee interface start | |
149 | #define __UNIX_SOCKET_OUTPUT_BUF_SIZE__ 3500 | |
150 | static struct proc_dir_entry *gunix_socket_track_aee_entry = NULL; | |
151 | #define UNIX_SOCK_TRACK_AEE_PROCNAME "driver/usktrk_aee" | |
152 | #define UNIX_SOCK_TRACK_PROC_AEE_SIZE 3072 | |
153 | ||
154 | static volatile unsigned int unix_sock_track_stop_flag = 0; | |
155 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
156 | ||
157 | ||
877ce7c1 | 158 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 159 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 160 | { |
dc49c1f9 | 161 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
877ce7c1 CZ |
162 | } |
163 | ||
164 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
165 | { | |
dc49c1f9 | 166 | scm->secid = *UNIXSID(skb); |
877ce7c1 CZ |
167 | } |
168 | #else | |
dc49c1f9 | 169 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
170 | { } |
171 | ||
172 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
173 | { } | |
174 | #endif /* CONFIG_SECURITY_NETWORK */ | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * SMP locking strategy: | |
fbe9cc4a | 178 | * hash table is protected with spinlock unix_table_lock |
663717f6 | 179 | * each socket state is protected by separate spin lock. |
1da177e4 LT |
180 | */ |
181 | ||
95c96174 | 182 | static inline unsigned int unix_hash_fold(__wsum n) |
1da177e4 | 183 | { |
83bb80f4 | 184 | unsigned int hash = (__force unsigned int)csum_fold(n); |
95c96174 | 185 | |
1da177e4 LT |
186 | hash ^= hash>>8; |
187 | return hash&(UNIX_HASH_SIZE-1); | |
188 | } | |
189 | ||
6fa3eb70 | 190 | |
1da177e4 LT |
191 | |
192 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
193 | { | |
194 | return unix_peer(osk) == sk; | |
195 | } | |
196 | ||
197 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
198 | { | |
6eba6a37 | 199 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
1da177e4 LT |
200 | } |
201 | ||
3c73419c RW |
202 | static inline int unix_recvq_full(struct sock const *sk) |
203 | { | |
204 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; | |
205 | } | |
206 | ||
fa7ff56f | 207 | struct sock *unix_peer_get(struct sock *s) |
1da177e4 LT |
208 | { |
209 | struct sock *peer; | |
210 | ||
1c92b4e5 | 211 | unix_state_lock(s); |
1da177e4 LT |
212 | peer = unix_peer(s); |
213 | if (peer) | |
214 | sock_hold(peer); | |
1c92b4e5 | 215 | unix_state_unlock(s); |
1da177e4 LT |
216 | return peer; |
217 | } | |
fa7ff56f | 218 | EXPORT_SYMBOL_GPL(unix_peer_get); |
1da177e4 LT |
219 | |
220 | static inline void unix_release_addr(struct unix_address *addr) | |
221 | { | |
222 | if (atomic_dec_and_test(&addr->refcnt)) | |
223 | kfree(addr); | |
224 | } | |
225 | ||
226 | /* | |
227 | * Check unix socket name: | |
228 | * - should be not zero length. | |
229 | * - if started by not zero, should be NULL terminated (FS object) | |
230 | * - if started by zero, it is abstract name. | |
231 | */ | |
ac7bfa62 | 232 | |
95c96174 | 233 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned int *hashp) |
1da177e4 LT |
234 | { |
235 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
236 | return -EINVAL; | |
237 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
238 | return -EINVAL; | |
239 | if (sunaddr->sun_path[0]) { | |
240 | /* | |
241 | * This may look like an off by one error but it is a bit more | |
242 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
25985edc | 243 | * sun_path[108] doesn't as such exist. However in kernel space |
1da177e4 LT |
244 | * we are guaranteed that it is a valid memory location in our |
245 | * kernel address buffer. | |
246 | */ | |
e27dfcea | 247 | ((char *)sunaddr)[len] = 0; |
1da177e4 LT |
248 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
249 | return len; | |
250 | } | |
251 | ||
07f0757a | 252 | *hashp = unix_hash_fold(csum_partial(sunaddr, len, 0)); |
1da177e4 LT |
253 | return len; |
254 | } | |
255 | ||
256 | static void __unix_remove_socket(struct sock *sk) | |
257 | { | |
258 | sk_del_node_init(sk); | |
259 | } | |
260 | ||
261 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
262 | { | |
547b792c | 263 | WARN_ON(!sk_unhashed(sk)); |
1da177e4 LT |
264 | sk_add_node(sk, list); |
265 | } | |
266 | ||
267 | static inline void unix_remove_socket(struct sock *sk) | |
268 | { | |
fbe9cc4a | 269 | spin_lock(&unix_table_lock); |
1da177e4 | 270 | __unix_remove_socket(sk); |
fbe9cc4a | 271 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
272 | } |
273 | ||
274 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
275 | { | |
fbe9cc4a | 276 | spin_lock(&unix_table_lock); |
1da177e4 | 277 | __unix_insert_socket(list, sk); |
fbe9cc4a | 278 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
279 | } |
280 | ||
097e66c5 DL |
281 | static struct sock *__unix_find_socket_byname(struct net *net, |
282 | struct sockaddr_un *sunname, | |
95c96174 | 283 | int len, int type, unsigned int hash) |
1da177e4 LT |
284 | { |
285 | struct sock *s; | |
1da177e4 | 286 | |
b67bfe0d | 287 | sk_for_each(s, &unix_socket_table[hash ^ type]) { |
1da177e4 LT |
288 | struct unix_sock *u = unix_sk(s); |
289 | ||
878628fb | 290 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
291 | continue; |
292 | ||
1da177e4 LT |
293 | if (u->addr->len == len && |
294 | !memcmp(u->addr->name, sunname, len)) | |
295 | goto found; | |
296 | } | |
297 | s = NULL; | |
298 | found: | |
299 | return s; | |
300 | } | |
301 | ||
097e66c5 DL |
302 | static inline struct sock *unix_find_socket_byname(struct net *net, |
303 | struct sockaddr_un *sunname, | |
1da177e4 | 304 | int len, int type, |
95c96174 | 305 | unsigned int hash) |
1da177e4 LT |
306 | { |
307 | struct sock *s; | |
308 | ||
fbe9cc4a | 309 | spin_lock(&unix_table_lock); |
097e66c5 | 310 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
311 | if (s) |
312 | sock_hold(s); | |
fbe9cc4a | 313 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
314 | return s; |
315 | } | |
316 | ||
6616f788 | 317 | static struct sock *unix_find_socket_byinode(struct inode *i) |
1da177e4 LT |
318 | { |
319 | struct sock *s; | |
1da177e4 | 320 | |
fbe9cc4a | 321 | spin_lock(&unix_table_lock); |
b67bfe0d | 322 | sk_for_each(s, |
1da177e4 | 323 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { |
40ffe67d | 324 | struct dentry *dentry = unix_sk(s)->path.dentry; |
1da177e4 | 325 | |
6eba6a37 | 326 | if (dentry && dentry->d_inode == i) { |
1da177e4 LT |
327 | sock_hold(s); |
328 | goto found; | |
329 | } | |
330 | } | |
331 | s = NULL; | |
332 | found: | |
fbe9cc4a | 333 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
334 | return s; |
335 | } | |
336 | ||
4b9e9796 S |
337 | /* Support code for asymmetrically connected dgram sockets |
338 | * | |
339 | * If a datagram socket is connected to a socket not itself connected | |
340 | * to the first socket (eg, /dev/log), clients may only enqueue more | |
341 | * messages if the present receive queue of the server socket is not | |
342 | * "too large". This means there's a second writeability condition | |
343 | * poll and sendmsg need to test. The dgram recv code will do a wake | |
344 | * up on the peer_wait wait queue of a socket upon reception of a | |
345 | * datagram which needs to be propagated to sleeping would-be writers | |
346 | * since these might not have sent anything so far. This can't be | |
347 | * accomplished via poll_wait because the lifetime of the server | |
348 | * socket might be less than that of its clients if these break their | |
349 | * association with it or if the server socket is closed while clients | |
350 | * are still connected to it and there's no way to inform "a polling | |
351 | * implementation" that it should let go of a certain wait queue | |
352 | * | |
353 | * In order to propagate a wake up, a wait_queue_t of the client | |
354 | * socket is enqueued on the peer_wait queue of the server socket | |
355 | * whose wake function does a wake_up on the ordinary client socket | |
356 | * wait queue. This connection is established whenever a write (or | |
357 | * poll for write) hit the flow control condition and broken when the | |
358 | * association to the server socket is dissolved or after a wake up | |
359 | * was relayed. | |
360 | */ | |
361 | ||
362 | static int unix_dgram_peer_wake_relay(wait_queue_t *q, unsigned mode, int flags, | |
363 | void *key) | |
364 | { | |
365 | struct unix_sock *u; | |
366 | wait_queue_head_t *u_sleep; | |
367 | ||
368 | u = container_of(q, struct unix_sock, peer_wake); | |
369 | ||
370 | __remove_wait_queue(&unix_sk(u->peer_wake.private)->peer_wait, | |
371 | q); | |
372 | u->peer_wake.private = NULL; | |
373 | ||
374 | /* relaying can only happen while the wq still exists */ | |
375 | u_sleep = sk_sleep(&u->sk); | |
376 | if (u_sleep) | |
377 | wake_up_interruptible_poll(u_sleep, key); | |
378 | ||
379 | return 0; | |
380 | } | |
381 | ||
382 | static int unix_dgram_peer_wake_connect(struct sock *sk, struct sock *other) | |
383 | { | |
384 | struct unix_sock *u, *u_other; | |
385 | int rc; | |
386 | ||
387 | u = unix_sk(sk); | |
388 | u_other = unix_sk(other); | |
389 | rc = 0; | |
390 | spin_lock(&u_other->peer_wait.lock); | |
391 | ||
392 | if (!u->peer_wake.private) { | |
393 | u->peer_wake.private = other; | |
394 | __add_wait_queue(&u_other->peer_wait, &u->peer_wake); | |
395 | ||
396 | rc = 1; | |
397 | } | |
398 | ||
399 | spin_unlock(&u_other->peer_wait.lock); | |
400 | return rc; | |
401 | } | |
402 | ||
403 | static void unix_dgram_peer_wake_disconnect(struct sock *sk, | |
404 | struct sock *other) | |
405 | { | |
406 | struct unix_sock *u, *u_other; | |
407 | ||
408 | u = unix_sk(sk); | |
409 | u_other = unix_sk(other); | |
410 | spin_lock(&u_other->peer_wait.lock); | |
411 | ||
412 | if (u->peer_wake.private == other) { | |
413 | __remove_wait_queue(&u_other->peer_wait, &u->peer_wake); | |
414 | u->peer_wake.private = NULL; | |
415 | } | |
416 | ||
417 | spin_unlock(&u_other->peer_wait.lock); | |
418 | } | |
419 | ||
420 | static void unix_dgram_peer_wake_disconnect_wakeup(struct sock *sk, | |
421 | struct sock *other) | |
422 | { | |
423 | unix_dgram_peer_wake_disconnect(sk, other); | |
424 | wake_up_interruptible_poll(sk_sleep(sk), | |
425 | POLLOUT | | |
426 | POLLWRNORM | | |
427 | POLLWRBAND); | |
428 | } | |
429 | ||
430 | /* preconditions: | |
431 | * - unix_peer(sk) == other | |
432 | * - association is stable | |
433 | */ | |
434 | static int unix_dgram_peer_wake_me(struct sock *sk, struct sock *other) | |
435 | { | |
436 | int connected; | |
437 | ||
438 | connected = unix_dgram_peer_wake_connect(sk, other); | |
439 | ||
440 | if (unix_recvq_full(other)) | |
441 | return 1; | |
442 | ||
443 | if (connected) | |
444 | unix_dgram_peer_wake_disconnect(sk, other); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
1da177e4 LT |
449 | static inline int unix_writable(struct sock *sk) |
450 | { | |
451 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
452 | } | |
453 | ||
454 | static void unix_write_space(struct sock *sk) | |
455 | { | |
43815482 ED |
456 | struct socket_wq *wq; |
457 | ||
458 | rcu_read_lock(); | |
1da177e4 | 459 | if (unix_writable(sk)) { |
43815482 ED |
460 | wq = rcu_dereference(sk->sk_wq); |
461 | if (wq_has_sleeper(wq)) | |
67426b75 ED |
462 | wake_up_interruptible_sync_poll(&wq->wait, |
463 | POLLOUT | POLLWRNORM | POLLWRBAND); | |
8d8ad9d7 | 464 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 | 465 | } |
43815482 | 466 | rcu_read_unlock(); |
1da177e4 LT |
467 | } |
468 | ||
469 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
470 | * queue of packets arrived from previous peer. First, it allows to do | |
471 | * flow control based only on wmem_alloc; second, sk connected to peer | |
472 | * may receive messages only from that peer. */ | |
473 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
474 | { | |
b03efcfb | 475 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
476 | skb_queue_purge(&sk->sk_receive_queue); |
477 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
478 | ||
479 | /* If one link of bidirectional dgram pipe is disconnected, | |
480 | * we signal error. Messages are lost. Do not make this, | |
481 | * when peer was not connected to us. | |
482 | */ | |
483 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
484 | other->sk_err = ECONNRESET; | |
485 | other->sk_error_report(other); | |
486 | } | |
487 | } | |
488 | } | |
489 | ||
490 | static void unix_sock_destructor(struct sock *sk) | |
491 | { | |
492 | struct unix_sock *u = unix_sk(sk); | |
493 | ||
494 | skb_queue_purge(&sk->sk_receive_queue); | |
495 | ||
547b792c IJ |
496 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
497 | WARN_ON(!sk_unhashed(sk)); | |
498 | WARN_ON(sk->sk_socket); | |
1da177e4 | 499 | if (!sock_flag(sk, SOCK_DEAD)) { |
6fa3eb70 S |
500 | #ifdef CONFIG_MTK_NET_LOGGING |
501 | printk(KERN_INFO "[mtk_net][unix]Attempt to release alive unix socket: %p\n", sk); | |
502 | #endif | |
1da177e4 LT |
503 | return; |
504 | } | |
505 | ||
506 | if (u->addr) | |
507 | unix_release_addr(u->addr); | |
508 | ||
518de9b3 | 509 | atomic_long_dec(&unix_nr_socks); |
6f756a8c | 510 | local_bh_disable(); |
a8076d8d | 511 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
6f756a8c | 512 | local_bh_enable(); |
6fa3eb70 S |
513 | #ifdef UNIX_REFCNT_DEBUG |
514 | printk(KERN_DEBUG "[mtk_net][unix]UNIX %p is destroyed, %ld are still alive.\n", sk, | |
518de9b3 | 515 | atomic_long_read(&unix_nr_socks)); |
6fa3eb70 | 516 | #endif |
1da177e4 LT |
517 | } |
518 | ||
ded34e0f | 519 | static void unix_release_sock(struct sock *sk, int embrion) |
1da177e4 LT |
520 | { |
521 | struct unix_sock *u = unix_sk(sk); | |
40ffe67d | 522 | struct path path; |
1da177e4 LT |
523 | struct sock *skpair; |
524 | struct sk_buff *skb; | |
525 | int state; | |
526 | ||
527 | unix_remove_socket(sk); | |
528 | ||
529 | /* Clear state */ | |
1c92b4e5 | 530 | unix_state_lock(sk); |
1da177e4 LT |
531 | sock_orphan(sk); |
532 | sk->sk_shutdown = SHUTDOWN_MASK; | |
40ffe67d AV |
533 | path = u->path; |
534 | u->path.dentry = NULL; | |
535 | u->path.mnt = NULL; | |
1da177e4 LT |
536 | state = sk->sk_state; |
537 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 538 | unix_state_unlock(sk); |
1da177e4 LT |
539 | |
540 | wake_up_interruptible_all(&u->peer_wait); | |
541 | ||
e27dfcea | 542 | skpair = unix_peer(sk); |
1da177e4 | 543 | |
e27dfcea | 544 | if (skpair != NULL) { |
1da177e4 | 545 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
1c92b4e5 | 546 | unix_state_lock(skpair); |
1da177e4 LT |
547 | /* No more writes */ |
548 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
549 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
550 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 551 | unix_state_unlock(skpair); |
1da177e4 | 552 | skpair->sk_state_change(skpair); |
8d8ad9d7 | 553 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 | 554 | } |
4b9e9796 S |
555 | |
556 | unix_dgram_peer_wake_disconnect(sk, skpair); | |
1da177e4 LT |
557 | sock_put(skpair); /* It may now die */ |
558 | unix_peer(sk) = NULL; | |
559 | } | |
560 | ||
561 | /* Try to flush out this socket. Throw out buffers at least */ | |
562 | ||
563 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e27dfcea | 564 | if (state == TCP_LISTEN) |
1da177e4 LT |
565 | unix_release_sock(skb->sk, 1); |
566 | /* passed fds are erased in the kfree_skb hook */ | |
567 | kfree_skb(skb); | |
568 | } | |
569 | ||
40ffe67d AV |
570 | if (path.dentry) |
571 | path_put(&path); | |
1da177e4 LT |
572 | |
573 | sock_put(sk); | |
574 | ||
575 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
576 | ||
577 | /* | |
e04dae84 | 578 | * Fixme: BSD difference: In BSD all sockets connected to us get |
1da177e4 LT |
579 | * ECONNRESET and we die on the spot. In Linux we behave |
580 | * like files and pipes do and wait for the last | |
581 | * dereference. | |
582 | * | |
583 | * Can't we simply set sock->err? | |
584 | * | |
585 | * What the above comment does talk about? --ANK(980817) | |
586 | */ | |
587 | ||
9305cfa4 | 588 | if (unix_tot_inflight) |
ac7bfa62 | 589 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
590 | } |
591 | ||
109f6e39 EB |
592 | static void init_peercred(struct sock *sk) |
593 | { | |
594 | put_pid(sk->sk_peer_pid); | |
595 | if (sk->sk_peer_cred) | |
596 | put_cred(sk->sk_peer_cred); | |
597 | sk->sk_peer_pid = get_pid(task_tgid(current)); | |
598 | sk->sk_peer_cred = get_current_cred(); | |
599 | } | |
600 | ||
601 | static void copy_peercred(struct sock *sk, struct sock *peersk) | |
602 | { | |
603 | put_pid(sk->sk_peer_pid); | |
604 | if (sk->sk_peer_cred) | |
605 | put_cred(sk->sk_peer_cred); | |
606 | sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); | |
607 | sk->sk_peer_cred = get_cred(peersk->sk_peer_cred); | |
608 | } | |
609 | ||
1da177e4 LT |
610 | static int unix_listen(struct socket *sock, int backlog) |
611 | { | |
612 | int err; | |
613 | struct sock *sk = sock->sk; | |
614 | struct unix_sock *u = unix_sk(sk); | |
109f6e39 | 615 | struct pid *old_pid = NULL; |
1da177e4 LT |
616 | |
617 | err = -EOPNOTSUPP; | |
6eba6a37 ED |
618 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
619 | goto out; /* Only stream/seqpacket sockets accept */ | |
1da177e4 LT |
620 | err = -EINVAL; |
621 | if (!u->addr) | |
6eba6a37 | 622 | goto out; /* No listens on an unbound socket */ |
1c92b4e5 | 623 | unix_state_lock(sk); |
1da177e4 LT |
624 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
625 | goto out_unlock; | |
626 | if (backlog > sk->sk_max_ack_backlog) | |
627 | wake_up_interruptible_all(&u->peer_wait); | |
628 | sk->sk_max_ack_backlog = backlog; | |
629 | sk->sk_state = TCP_LISTEN; | |
630 | /* set credentials so connect can copy them */ | |
109f6e39 | 631 | init_peercred(sk); |
1da177e4 LT |
632 | err = 0; |
633 | ||
634 | out_unlock: | |
1c92b4e5 | 635 | unix_state_unlock(sk); |
109f6e39 | 636 | put_pid(old_pid); |
1da177e4 | 637 | out: |
6fa3eb70 | 638 | |
1da177e4 LT |
639 | return err; |
640 | } | |
641 | ||
642 | static int unix_release(struct socket *); | |
643 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
644 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
645 | int addr_len, int flags); | |
646 | static int unix_socketpair(struct socket *, struct socket *); | |
647 | static int unix_accept(struct socket *, struct socket *, int); | |
648 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
649 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
ec0d215f RW |
650 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
651 | poll_table *); | |
1da177e4 LT |
652 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
653 | static int unix_shutdown(struct socket *, int); | |
654 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
655 | struct msghdr *, size_t); | |
656 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
657 | struct msghdr *, size_t, int); | |
658 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
659 | struct msghdr *, size_t); | |
660 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
661 | struct msghdr *, size_t, int); | |
662 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
663 | int, int); | |
664 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
665 | struct msghdr *, size_t); | |
a05d2ad1 EB |
666 | static int unix_seqpacket_recvmsg(struct kiocb *, struct socket *, |
667 | struct msghdr *, size_t, int); | |
1da177e4 | 668 | |
d90d9ff6 | 669 | static int unix_set_peek_off(struct sock *sk, int val) |
f55bb7f9 PE |
670 | { |
671 | struct unix_sock *u = unix_sk(sk); | |
672 | ||
d90d9ff6 SL |
673 | if (mutex_lock_interruptible(&u->readlock)) |
674 | return -EINTR; | |
675 | ||
f55bb7f9 PE |
676 | sk->sk_peek_off = val; |
677 | mutex_unlock(&u->readlock); | |
d90d9ff6 SL |
678 | |
679 | return 0; | |
f55bb7f9 PE |
680 | } |
681 | ||
682 | ||
90ddc4f0 | 683 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
684 | .family = PF_UNIX, |
685 | .owner = THIS_MODULE, | |
686 | .release = unix_release, | |
687 | .bind = unix_bind, | |
688 | .connect = unix_stream_connect, | |
689 | .socketpair = unix_socketpair, | |
690 | .accept = unix_accept, | |
691 | .getname = unix_getname, | |
692 | .poll = unix_poll, | |
693 | .ioctl = unix_ioctl, | |
694 | .listen = unix_listen, | |
695 | .shutdown = unix_shutdown, | |
696 | .setsockopt = sock_no_setsockopt, | |
697 | .getsockopt = sock_no_getsockopt, | |
698 | .sendmsg = unix_stream_sendmsg, | |
699 | .recvmsg = unix_stream_recvmsg, | |
700 | .mmap = sock_no_mmap, | |
701 | .sendpage = sock_no_sendpage, | |
fc0d7536 | 702 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
703 | }; |
704 | ||
90ddc4f0 | 705 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
706 | .family = PF_UNIX, |
707 | .owner = THIS_MODULE, | |
708 | .release = unix_release, | |
709 | .bind = unix_bind, | |
710 | .connect = unix_dgram_connect, | |
711 | .socketpair = unix_socketpair, | |
712 | .accept = sock_no_accept, | |
713 | .getname = unix_getname, | |
ec0d215f | 714 | .poll = unix_dgram_poll, |
1da177e4 LT |
715 | .ioctl = unix_ioctl, |
716 | .listen = sock_no_listen, | |
717 | .shutdown = unix_shutdown, | |
718 | .setsockopt = sock_no_setsockopt, | |
719 | .getsockopt = sock_no_getsockopt, | |
720 | .sendmsg = unix_dgram_sendmsg, | |
721 | .recvmsg = unix_dgram_recvmsg, | |
722 | .mmap = sock_no_mmap, | |
723 | .sendpage = sock_no_sendpage, | |
f55bb7f9 | 724 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
725 | }; |
726 | ||
90ddc4f0 | 727 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
728 | .family = PF_UNIX, |
729 | .owner = THIS_MODULE, | |
730 | .release = unix_release, | |
731 | .bind = unix_bind, | |
732 | .connect = unix_stream_connect, | |
733 | .socketpair = unix_socketpair, | |
734 | .accept = unix_accept, | |
735 | .getname = unix_getname, | |
ec0d215f | 736 | .poll = unix_dgram_poll, |
1da177e4 LT |
737 | .ioctl = unix_ioctl, |
738 | .listen = unix_listen, | |
739 | .shutdown = unix_shutdown, | |
740 | .setsockopt = sock_no_setsockopt, | |
741 | .getsockopt = sock_no_getsockopt, | |
742 | .sendmsg = unix_seqpacket_sendmsg, | |
a05d2ad1 | 743 | .recvmsg = unix_seqpacket_recvmsg, |
1da177e4 LT |
744 | .mmap = sock_no_mmap, |
745 | .sendpage = sock_no_sendpage, | |
f55bb7f9 | 746 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
747 | }; |
748 | ||
749 | static struct proto unix_proto = { | |
248969ae ED |
750 | .name = "UNIX", |
751 | .owner = THIS_MODULE, | |
248969ae | 752 | .obj_size = sizeof(struct unix_sock), |
1da177e4 LT |
753 | }; |
754 | ||
a09785a2 IM |
755 | /* |
756 | * AF_UNIX sockets do not interact with hardware, hence they | |
757 | * dont trigger interrupts - so it's safe for them to have | |
758 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
759 | * this special lock-class by reinitializing the spinlock key: | |
760 | */ | |
761 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
762 | ||
6eba6a37 | 763 | static struct sock *unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
764 | { |
765 | struct sock *sk = NULL; | |
766 | struct unix_sock *u; | |
767 | ||
518de9b3 ED |
768 | atomic_long_inc(&unix_nr_socks); |
769 | if (atomic_long_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
770 | goto out; |
771 | ||
6257ff21 | 772 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
773 | if (!sk) |
774 | goto out; | |
775 | ||
6eba6a37 | 776 | sock_init_data(sock, sk); |
a09785a2 IM |
777 | lockdep_set_class(&sk->sk_receive_queue.lock, |
778 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
779 | |
780 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 781 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
782 | sk->sk_destruct = unix_sock_destructor; |
783 | u = unix_sk(sk); | |
40ffe67d AV |
784 | u->path.dentry = NULL; |
785 | u->path.mnt = NULL; | |
fd19f329 | 786 | spin_lock_init(&u->lock); |
516e0cc5 | 787 | atomic_long_set(&u->inflight, 0); |
1fd05ba5 | 788 | INIT_LIST_HEAD(&u->link); |
57b47a53 | 789 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 | 790 | init_waitqueue_head(&u->peer_wait); |
4b9e9796 | 791 | init_waitqueue_func_entry(&u->peer_wake, unix_dgram_peer_wake_relay); |
7123aaa3 | 792 | unix_insert_socket(unix_sockets_unbound(sk), sk); |
1da177e4 | 793 | out: |
284b327b | 794 | if (sk == NULL) |
518de9b3 | 795 | atomic_long_dec(&unix_nr_socks); |
920de804 ED |
796 | else { |
797 | local_bh_disable(); | |
a8076d8d | 798 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
920de804 ED |
799 | local_bh_enable(); |
800 | } | |
1da177e4 LT |
801 | return sk; |
802 | } | |
803 | ||
3f378b68 EP |
804 | static int unix_create(struct net *net, struct socket *sock, int protocol, |
805 | int kern) | |
1da177e4 LT |
806 | { |
807 | if (protocol && protocol != PF_UNIX) | |
808 | return -EPROTONOSUPPORT; | |
809 | ||
810 | sock->state = SS_UNCONNECTED; | |
811 | ||
812 | switch (sock->type) { | |
813 | case SOCK_STREAM: | |
814 | sock->ops = &unix_stream_ops; | |
815 | break; | |
816 | /* | |
817 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
818 | * nothing uses it. | |
819 | */ | |
820 | case SOCK_RAW: | |
e27dfcea | 821 | sock->type = SOCK_DGRAM; |
1da177e4 LT |
822 | case SOCK_DGRAM: |
823 | sock->ops = &unix_dgram_ops; | |
824 | break; | |
825 | case SOCK_SEQPACKET: | |
826 | sock->ops = &unix_seqpacket_ops; | |
827 | break; | |
828 | default: | |
829 | return -ESOCKTNOSUPPORT; | |
830 | } | |
831 | ||
1b8d7ae4 | 832 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
833 | } |
834 | ||
835 | static int unix_release(struct socket *sock) | |
836 | { | |
837 | struct sock *sk = sock->sk; | |
838 | ||
839 | if (!sk) | |
840 | return 0; | |
841 | ||
ded34e0f | 842 | unix_release_sock(sk, 0); |
1da177e4 LT |
843 | sock->sk = NULL; |
844 | ||
ded34e0f | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
848 | static int unix_autobind(struct socket *sock) | |
849 | { | |
850 | struct sock *sk = sock->sk; | |
3b1e0a65 | 851 | struct net *net = sock_net(sk); |
1da177e4 LT |
852 | struct unix_sock *u = unix_sk(sk); |
853 | static u32 ordernum = 1; | |
6eba6a37 | 854 | struct unix_address *addr; |
1da177e4 | 855 | int err; |
8df73ff9 | 856 | unsigned int retries = 0; |
1da177e4 | 857 | |
57bc52eb SL |
858 | err = mutex_lock_interruptible(&u->readlock); |
859 | if (err) | |
860 | return err; | |
1da177e4 LT |
861 | |
862 | err = 0; | |
863 | if (u->addr) | |
864 | goto out; | |
865 | ||
866 | err = -ENOMEM; | |
0da974f4 | 867 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
868 | if (!addr) |
869 | goto out; | |
870 | ||
1da177e4 LT |
871 | addr->name->sun_family = AF_UNIX; |
872 | atomic_set(&addr->refcnt, 1); | |
873 | ||
874 | retry: | |
875 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
07f0757a | 876 | addr->hash = unix_hash_fold(csum_partial(addr->name, addr->len, 0)); |
1da177e4 | 877 | |
fbe9cc4a | 878 | spin_lock(&unix_table_lock); |
1da177e4 LT |
879 | ordernum = (ordernum+1)&0xFFFFF; |
880 | ||
097e66c5 | 881 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 882 | addr->hash)) { |
fbe9cc4a | 883 | spin_unlock(&unix_table_lock); |
8df73ff9 TH |
884 | /* |
885 | * __unix_find_socket_byname() may take long time if many names | |
886 | * are already in use. | |
887 | */ | |
888 | cond_resched(); | |
889 | /* Give up if all names seems to be in use. */ | |
890 | if (retries++ == 0xFFFFF) { | |
891 | err = -ENOSPC; | |
892 | kfree(addr); | |
893 | goto out; | |
894 | } | |
1da177e4 LT |
895 | goto retry; |
896 | } | |
897 | addr->hash ^= sk->sk_type; | |
898 | ||
899 | __unix_remove_socket(sk); | |
900 | u->addr = addr; | |
901 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 902 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
903 | err = 0; |
904 | ||
57b47a53 | 905 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
906 | return err; |
907 | } | |
908 | ||
097e66c5 DL |
909 | static struct sock *unix_find_other(struct net *net, |
910 | struct sockaddr_un *sunname, int len, | |
95c96174 | 911 | int type, unsigned int hash, int *error) |
1da177e4 LT |
912 | { |
913 | struct sock *u; | |
421748ec | 914 | struct path path; |
1da177e4 | 915 | int err = 0; |
ac7bfa62 | 916 | |
1da177e4 | 917 | if (sunname->sun_path[0]) { |
421748ec AV |
918 | struct inode *inode; |
919 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); | |
1da177e4 LT |
920 | if (err) |
921 | goto fail; | |
421748ec AV |
922 | inode = path.dentry->d_inode; |
923 | err = inode_permission(inode, MAY_WRITE); | |
1da177e4 LT |
924 | if (err) |
925 | goto put_fail; | |
926 | ||
927 | err = -ECONNREFUSED; | |
421748ec | 928 | if (!S_ISSOCK(inode->i_mode)) |
1da177e4 | 929 | goto put_fail; |
6616f788 | 930 | u = unix_find_socket_byinode(inode); |
1da177e4 LT |
931 | if (!u) |
932 | goto put_fail; | |
933 | ||
934 | if (u->sk_type == type) | |
68ac1234 | 935 | touch_atime(&path); |
1da177e4 | 936 | |
421748ec | 937 | path_put(&path); |
1da177e4 | 938 | |
e27dfcea | 939 | err = -EPROTOTYPE; |
1da177e4 LT |
940 | if (u->sk_type != type) { |
941 | sock_put(u); | |
942 | goto fail; | |
943 | } | |
944 | } else { | |
945 | err = -ECONNREFUSED; | |
e27dfcea | 946 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
947 | if (u) { |
948 | struct dentry *dentry; | |
40ffe67d | 949 | dentry = unix_sk(u)->path.dentry; |
1da177e4 | 950 | if (dentry) |
68ac1234 | 951 | touch_atime(&unix_sk(u)->path); |
1da177e4 LT |
952 | } else |
953 | goto fail; | |
954 | } | |
955 | return u; | |
956 | ||
957 | put_fail: | |
421748ec | 958 | path_put(&path); |
1da177e4 | 959 | fail: |
e27dfcea | 960 | *error = err; |
1da177e4 LT |
961 | return NULL; |
962 | } | |
963 | ||
faf02010 AV |
964 | static int unix_mknod(const char *sun_path, umode_t mode, struct path *res) |
965 | { | |
966 | struct dentry *dentry; | |
967 | struct path path; | |
968 | int err = 0; | |
969 | /* | |
970 | * Get the parent directory, calculate the hash for last | |
971 | * component. | |
972 | */ | |
973 | dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0); | |
974 | err = PTR_ERR(dentry); | |
975 | if (IS_ERR(dentry)) | |
976 | return err; | |
977 | ||
978 | /* | |
979 | * All right, let's create it. | |
980 | */ | |
981 | err = security_path_mknod(&path, dentry, mode, 0); | |
982 | if (!err) { | |
983 | err = vfs_mknod(path.dentry->d_inode, dentry, mode, 0); | |
984 | if (!err) { | |
985 | res->mnt = mntget(path.mnt); | |
986 | res->dentry = dget(dentry); | |
987 | } | |
988 | } | |
989 | done_path_create(&path, dentry); | |
990 | return err; | |
991 | } | |
1da177e4 LT |
992 | |
993 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
994 | { | |
995 | struct sock *sk = sock->sk; | |
3b1e0a65 | 996 | struct net *net = sock_net(sk); |
1da177e4 | 997 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 998 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
dae6ad8f | 999 | char *sun_path = sunaddr->sun_path; |
1da177e4 | 1000 | int err; |
95c96174 | 1001 | unsigned int hash; |
1da177e4 LT |
1002 | struct unix_address *addr; |
1003 | struct hlist_head *list; | |
ddee2228 | 1004 | struct path path = { NULL, NULL }; |
1da177e4 LT |
1005 | |
1006 | err = -EINVAL; | |
1007 | if (sunaddr->sun_family != AF_UNIX) | |
1008 | goto out; | |
1009 | ||
e27dfcea | 1010 | if (addr_len == sizeof(short)) { |
1da177e4 LT |
1011 | err = unix_autobind(sock); |
1012 | goto out; | |
1013 | } | |
1014 | ||
1015 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1016 | if (err < 0) | |
1017 | goto out; | |
1018 | addr_len = err; | |
1019 | ||
ddee2228 WC |
1020 | if (sun_path[0]) { |
1021 | umode_t mode = S_IFSOCK | | |
1022 | (SOCK_INODE(sock)->i_mode & ~current_umask()); | |
1023 | err = unix_mknod(sun_path, mode, &path); | |
1024 | if (err) { | |
1025 | if (err == -EEXIST) | |
1026 | err = -EADDRINUSE; | |
1027 | goto out; | |
1028 | } | |
1029 | } | |
1030 | ||
57bc52eb SL |
1031 | err = mutex_lock_interruptible(&u->readlock); |
1032 | if (err) | |
ddee2228 | 1033 | goto out_put; |
1da177e4 LT |
1034 | |
1035 | err = -EINVAL; | |
1036 | if (u->addr) | |
1037 | goto out_up; | |
1038 | ||
1039 | err = -ENOMEM; | |
1040 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
1041 | if (!addr) | |
1042 | goto out_up; | |
1043 | ||
1044 | memcpy(addr->name, sunaddr, addr_len); | |
1045 | addr->len = addr_len; | |
1046 | addr->hash = hash ^ sk->sk_type; | |
1047 | atomic_set(&addr->refcnt, 1); | |
1048 | ||
dae6ad8f | 1049 | if (sun_path[0]) { |
1da177e4 | 1050 | addr->hash = UNIX_HASH_SIZE; |
faf02010 AV |
1051 | hash = path.dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1); |
1052 | spin_lock(&unix_table_lock); | |
1053 | u->path = path; | |
1054 | list = &unix_socket_table[hash]; | |
1055 | } else { | |
1056 | spin_lock(&unix_table_lock); | |
1da177e4 | 1057 | err = -EADDRINUSE; |
097e66c5 | 1058 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
1059 | sk->sk_type, hash)) { |
1060 | unix_release_addr(addr); | |
1061 | goto out_unlock; | |
1062 | } | |
1063 | ||
1064 | list = &unix_socket_table[addr->hash]; | |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | err = 0; | |
1068 | __unix_remove_socket(sk); | |
1069 | u->addr = addr; | |
1070 | __unix_insert_socket(list, sk); | |
1071 | ||
1072 | out_unlock: | |
fbe9cc4a | 1073 | spin_unlock(&unix_table_lock); |
1da177e4 | 1074 | out_up: |
57b47a53 | 1075 | mutex_unlock(&u->readlock); |
ddee2228 WC |
1076 | out_put: |
1077 | if (err) | |
1078 | path_put(&path); | |
1da177e4 | 1079 | out: |
6fa3eb70 | 1080 | |
1da177e4 | 1081 | return err; |
1da177e4 LT |
1082 | } |
1083 | ||
278a3de5 DM |
1084 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
1085 | { | |
1086 | if (unlikely(sk1 == sk2) || !sk2) { | |
1087 | unix_state_lock(sk1); | |
1088 | return; | |
1089 | } | |
1090 | if (sk1 < sk2) { | |
1091 | unix_state_lock(sk1); | |
1092 | unix_state_lock_nested(sk2); | |
1093 | } else { | |
1094 | unix_state_lock(sk2); | |
1095 | unix_state_lock_nested(sk1); | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
1100 | { | |
1101 | if (unlikely(sk1 == sk2) || !sk2) { | |
1102 | unix_state_unlock(sk1); | |
1103 | return; | |
1104 | } | |
1105 | unix_state_unlock(sk1); | |
1106 | unix_state_unlock(sk2); | |
1107 | } | |
1108 | ||
1da177e4 LT |
1109 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
1110 | int alen, int flags) | |
1111 | { | |
1112 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1113 | struct net *net = sock_net(sk); |
e27dfcea | 1114 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
1da177e4 | 1115 | struct sock *other; |
95c96174 | 1116 | unsigned int hash; |
1da177e4 LT |
1117 | int err; |
1118 | ||
1119 | if (addr->sa_family != AF_UNSPEC) { | |
6fa3eb70 | 1120 | |
1da177e4 LT |
1121 | err = unix_mkname(sunaddr, alen, &hash); |
1122 | if (err < 0) | |
1123 | goto out; | |
1124 | alen = err; | |
1125 | ||
1126 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
1127 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
1128 | goto out; | |
1129 | ||
278a3de5 | 1130 | restart: |
e27dfcea | 1131 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
1132 | if (!other) |
1133 | goto out; | |
1134 | ||
278a3de5 DM |
1135 | unix_state_double_lock(sk, other); |
1136 | ||
1137 | /* Apparently VFS overslept socket death. Retry. */ | |
1138 | if (sock_flag(other, SOCK_DEAD)) { | |
1139 | unix_state_double_unlock(sk, other); | |
1140 | sock_put(other); | |
1141 | goto restart; | |
1142 | } | |
1da177e4 LT |
1143 | |
1144 | err = -EPERM; | |
1145 | if (!unix_may_send(sk, other)) | |
1146 | goto out_unlock; | |
1147 | ||
1148 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1149 | if (err) | |
1150 | goto out_unlock; | |
1151 | ||
1152 | } else { | |
1153 | /* | |
1154 | * 1003.1g breaking connected state with AF_UNSPEC | |
1155 | */ | |
1156 | other = NULL; | |
278a3de5 | 1157 | unix_state_double_lock(sk, other); |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | /* | |
1161 | * If it was connected, reconnect. | |
1162 | */ | |
1163 | if (unix_peer(sk)) { | |
1164 | struct sock *old_peer = unix_peer(sk); | |
e27dfcea | 1165 | unix_peer(sk) = other; |
4b9e9796 S |
1166 | unix_dgram_peer_wake_disconnect_wakeup(sk, old_peer); |
1167 | ||
278a3de5 | 1168 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
1169 | |
1170 | if (other != old_peer) | |
1171 | unix_dgram_disconnected(sk, old_peer); | |
1172 | sock_put(old_peer); | |
1173 | } else { | |
e27dfcea | 1174 | unix_peer(sk) = other; |
278a3de5 | 1175 | unix_state_double_unlock(sk, other); |
1da177e4 | 1176 | } |
6fa3eb70 S |
1177 | |
1178 | #ifdef CONFIG_MTK_NET_LOGGING | |
1179 | if((SOCK_INODE(sock)!= NULL) && (sunaddr != NULL) && (other->sk_socket != NULL) && (SOCK_INODE(other->sk_socket) != NULL)) | |
1180 | { | |
1181 | printk(KERN_INFO "[mtk_net][socket]unix_dgram_connect[%lu]:connect [%s] other[%lu]\n",SOCK_INODE(sock)->i_ino,sunaddr->sun_path,SOCK_INODE(other->sk_socket)->i_ino); | |
1182 | } | |
1183 | #endif | |
1184 | ||
ac7bfa62 | 1185 | return 0; |
1da177e4 LT |
1186 | |
1187 | out_unlock: | |
278a3de5 | 1188 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
1189 | sock_put(other); |
1190 | out: | |
6fa3eb70 | 1191 | |
1da177e4 LT |
1192 | return err; |
1193 | } | |
1194 | ||
1195 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
1196 | { | |
1197 | struct unix_sock *u = unix_sk(other); | |
1198 | int sched; | |
1199 | DEFINE_WAIT(wait); | |
1200 | ||
1201 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
1202 | ||
1203 | sched = !sock_flag(other, SOCK_DEAD) && | |
1204 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
3c73419c | 1205 | unix_recvq_full(other); |
1da177e4 | 1206 | |
1c92b4e5 | 1207 | unix_state_unlock(other); |
1da177e4 LT |
1208 | |
1209 | if (sched) | |
1210 | timeo = schedule_timeout(timeo); | |
1211 | ||
1212 | finish_wait(&u->peer_wait, &wait); | |
1213 | return timeo; | |
1214 | } | |
1215 | ||
1216 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
1217 | int addr_len, int flags) | |
1218 | { | |
e27dfcea | 1219 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
1da177e4 | 1220 | struct sock *sk = sock->sk; |
3b1e0a65 | 1221 | struct net *net = sock_net(sk); |
1da177e4 LT |
1222 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1223 | struct sock *newsk = NULL; | |
1224 | struct sock *other = NULL; | |
1225 | struct sk_buff *skb = NULL; | |
95c96174 | 1226 | unsigned int hash; |
1da177e4 LT |
1227 | int st; |
1228 | int err; | |
1229 | long timeo; | |
1230 | ||
1231 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1232 | if (err < 0) | |
1233 | goto out; | |
1234 | addr_len = err; | |
1235 | ||
f64f9e71 JP |
1236 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr && |
1237 | (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1238 | goto out; |
1239 | ||
1240 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1241 | ||
1242 | /* First of all allocate resources. | |
1243 | If we will make it after state is locked, | |
1244 | we will have to recheck all again in any case. | |
1245 | */ | |
1246 | ||
1247 | err = -ENOMEM; | |
1248 | ||
1249 | /* create new sock for complete connection */ | |
3b1e0a65 | 1250 | newsk = unix_create1(sock_net(sk), NULL); |
1da177e4 LT |
1251 | if (newsk == NULL) |
1252 | goto out; | |
1253 | ||
1254 | /* Allocate skb for sending to listening sock */ | |
1255 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1256 | if (skb == NULL) | |
1257 | goto out; | |
1258 | ||
1259 | restart: | |
1260 | /* Find listening sock. */ | |
097e66c5 | 1261 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1262 | if (!other) |
1263 | goto out; | |
1264 | ||
1265 | /* Latch state of peer */ | |
1c92b4e5 | 1266 | unix_state_lock(other); |
1da177e4 LT |
1267 | |
1268 | /* Apparently VFS overslept socket death. Retry. */ | |
1269 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1270 | unix_state_unlock(other); |
1da177e4 LT |
1271 | sock_put(other); |
1272 | goto restart; | |
1273 | } | |
1274 | ||
1275 | err = -ECONNREFUSED; | |
1276 | if (other->sk_state != TCP_LISTEN) | |
1277 | goto out_unlock; | |
77238f2b TS |
1278 | if (other->sk_shutdown & RCV_SHUTDOWN) |
1279 | goto out_unlock; | |
1da177e4 | 1280 | |
3c73419c | 1281 | if (unix_recvq_full(other)) { |
1da177e4 LT |
1282 | err = -EAGAIN; |
1283 | if (!timeo) | |
1284 | goto out_unlock; | |
1285 | ||
1286 | timeo = unix_wait_for_peer(other, timeo); | |
1287 | ||
1288 | err = sock_intr_errno(timeo); | |
1289 | if (signal_pending(current)) | |
1290 | goto out; | |
1291 | sock_put(other); | |
1292 | goto restart; | |
ac7bfa62 | 1293 | } |
1da177e4 LT |
1294 | |
1295 | /* Latch our state. | |
1296 | ||
e5537bfc | 1297 | It is tricky place. We need to grab our state lock and cannot |
1da177e4 LT |
1298 | drop lock on peer. It is dangerous because deadlock is |
1299 | possible. Connect to self case and simultaneous | |
1300 | attempt to connect are eliminated by checking socket | |
1301 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1302 | check this before attempt to grab lock. | |
1303 | ||
1304 | Well, and we have to recheck the state after socket locked. | |
1305 | */ | |
1306 | st = sk->sk_state; | |
1307 | ||
1308 | switch (st) { | |
1309 | case TCP_CLOSE: | |
1310 | /* This is ok... continue with connect */ | |
1311 | break; | |
1312 | case TCP_ESTABLISHED: | |
1313 | /* Socket is already connected */ | |
1314 | err = -EISCONN; | |
1315 | goto out_unlock; | |
1316 | default: | |
1317 | err = -EINVAL; | |
1318 | goto out_unlock; | |
1319 | } | |
1320 | ||
1c92b4e5 | 1321 | unix_state_lock_nested(sk); |
1da177e4 LT |
1322 | |
1323 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1324 | unix_state_unlock(sk); |
1325 | unix_state_unlock(other); | |
1da177e4 LT |
1326 | sock_put(other); |
1327 | goto restart; | |
1328 | } | |
1329 | ||
3610cda5 | 1330 | err = security_unix_stream_connect(sk, other, newsk); |
1da177e4 | 1331 | if (err) { |
1c92b4e5 | 1332 | unix_state_unlock(sk); |
1da177e4 LT |
1333 | goto out_unlock; |
1334 | } | |
1335 | ||
1336 | /* The way is open! Fastly set all the necessary fields... */ | |
1337 | ||
1338 | sock_hold(sk); | |
1339 | unix_peer(newsk) = sk; | |
1340 | newsk->sk_state = TCP_ESTABLISHED; | |
1341 | newsk->sk_type = sk->sk_type; | |
109f6e39 | 1342 | init_peercred(newsk); |
1da177e4 | 1343 | newu = unix_sk(newsk); |
eaefd110 | 1344 | RCU_INIT_POINTER(newsk->sk_wq, &newu->peer_wq); |
1da177e4 LT |
1345 | otheru = unix_sk(other); |
1346 | ||
1347 | /* copy address information from listening to new sock*/ | |
1348 | if (otheru->addr) { | |
1349 | atomic_inc(&otheru->addr->refcnt); | |
1350 | newu->addr = otheru->addr; | |
1351 | } | |
40ffe67d AV |
1352 | if (otheru->path.dentry) { |
1353 | path_get(&otheru->path); | |
1354 | newu->path = otheru->path; | |
1da177e4 LT |
1355 | } |
1356 | ||
1357 | /* Set credentials */ | |
109f6e39 | 1358 | copy_peercred(sk, other); |
1da177e4 | 1359 | |
1da177e4 LT |
1360 | sock->state = SS_CONNECTED; |
1361 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1362 | sock_hold(newsk); |
1363 | ||
1364 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1365 | unix_peer(sk) = newsk; | |
1da177e4 | 1366 | |
1c92b4e5 | 1367 | unix_state_unlock(sk); |
1da177e4 LT |
1368 | |
1369 | /* take ten and and send info to listening sock */ | |
1370 | spin_lock(&other->sk_receive_queue.lock); | |
1371 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1372 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1373 | unix_state_unlock(other); |
6fa3eb70 S |
1374 | |
1375 | #ifdef CONFIG_MTK_NET_LOGGING | |
1376 | if((SOCK_INODE(sock)!= NULL) && (sunaddr != NULL) && (other->sk_socket != NULL) && (SOCK_INODE(other->sk_socket) != NULL)) | |
1377 | { | |
1378 | printk(KERN_INFO "[mtk_net][socket]unix_stream_connect[%lu ]: connect [%s] other[%lu] \n",SOCK_INODE(sock)->i_ino,sunaddr->sun_path,SOCK_INODE(other->sk_socket)->i_ino); | |
1379 | } | |
1380 | #endif | |
1381 | ||
1da177e4 LT |
1382 | other->sk_data_ready(other, 0); |
1383 | sock_put(other); | |
6fa3eb70 | 1384 | |
1da177e4 LT |
1385 | return 0; |
1386 | ||
1387 | out_unlock: | |
1388 | if (other) | |
1c92b4e5 | 1389 | unix_state_unlock(other); |
1da177e4 LT |
1390 | |
1391 | out: | |
40d44446 | 1392 | kfree_skb(skb); |
1da177e4 LT |
1393 | if (newsk) |
1394 | unix_release_sock(newsk, 0); | |
1395 | if (other) | |
1396 | sock_put(other); | |
6fa3eb70 | 1397 | |
1da177e4 LT |
1398 | return err; |
1399 | } | |
1400 | ||
1401 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1402 | { | |
e27dfcea | 1403 | struct sock *ska = socka->sk, *skb = sockb->sk; |
1da177e4 LT |
1404 | |
1405 | /* Join our sockets back to back */ | |
1406 | sock_hold(ska); | |
1407 | sock_hold(skb); | |
e27dfcea JK |
1408 | unix_peer(ska) = skb; |
1409 | unix_peer(skb) = ska; | |
109f6e39 EB |
1410 | init_peercred(ska); |
1411 | init_peercred(skb); | |
1da177e4 LT |
1412 | |
1413 | if (ska->sk_type != SOCK_DGRAM) { | |
1414 | ska->sk_state = TCP_ESTABLISHED; | |
1415 | skb->sk_state = TCP_ESTABLISHED; | |
1416 | socka->state = SS_CONNECTED; | |
1417 | sockb->state = SS_CONNECTED; | |
1418 | } | |
1419 | return 0; | |
1420 | } | |
1421 | ||
a769ad65 DB |
1422 | static void unix_sock_inherit_flags(const struct socket *old, |
1423 | struct socket *new) | |
1424 | { | |
1425 | if (test_bit(SOCK_PASSCRED, &old->flags)) | |
1426 | set_bit(SOCK_PASSCRED, &new->flags); | |
1427 | if (test_bit(SOCK_PASSSEC, &old->flags)) | |
1428 | set_bit(SOCK_PASSSEC, &new->flags); | |
1429 | } | |
1430 | ||
1da177e4 LT |
1431 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) |
1432 | { | |
1433 | struct sock *sk = sock->sk; | |
1434 | struct sock *tsk; | |
1435 | struct sk_buff *skb; | |
1436 | int err; | |
1437 | ||
1438 | err = -EOPNOTSUPP; | |
6eba6a37 | 1439 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
1da177e4 LT |
1440 | goto out; |
1441 | ||
1442 | err = -EINVAL; | |
1443 | if (sk->sk_state != TCP_LISTEN) | |
1444 | goto out; | |
1445 | ||
1446 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1447 | * so that no locks are necessary. | |
1448 | */ | |
6fa3eb70 | 1449 | |
1da177e4 LT |
1450 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); |
1451 | if (!skb) { | |
1452 | /* This means receive shutdown. */ | |
1453 | if (err == 0) | |
1454 | err = -EINVAL; | |
1455 | goto out; | |
1456 | } | |
1457 | ||
1458 | tsk = skb->sk; | |
1459 | skb_free_datagram(sk, skb); | |
1460 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1461 | ||
1462 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1463 | unix_state_lock(tsk); |
1da177e4 | 1464 | newsock->state = SS_CONNECTED; |
a769ad65 | 1465 | unix_sock_inherit_flags(sock, newsock); |
1da177e4 | 1466 | sock_graft(tsk, newsock); |
1c92b4e5 | 1467 | unix_state_unlock(tsk); |
6fa3eb70 | 1468 | |
1da177e4 LT |
1469 | return 0; |
1470 | ||
1471 | out: | |
6fa3eb70 | 1472 | |
1da177e4 LT |
1473 | return err; |
1474 | } | |
1475 | ||
1476 | ||
1477 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1478 | { | |
1479 | struct sock *sk = sock->sk; | |
1480 | struct unix_sock *u; | |
13cfa97b | 1481 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, uaddr); |
1da177e4 LT |
1482 | int err = 0; |
1483 | ||
1484 | if (peer) { | |
1485 | sk = unix_peer_get(sk); | |
1486 | ||
1487 | err = -ENOTCONN; | |
1488 | if (!sk) | |
1489 | goto out; | |
1490 | err = 0; | |
1491 | } else { | |
1492 | sock_hold(sk); | |
1493 | } | |
1494 | ||
1495 | u = unix_sk(sk); | |
1c92b4e5 | 1496 | unix_state_lock(sk); |
1da177e4 LT |
1497 | if (!u->addr) { |
1498 | sunaddr->sun_family = AF_UNIX; | |
1499 | sunaddr->sun_path[0] = 0; | |
1500 | *uaddr_len = sizeof(short); | |
1501 | } else { | |
1502 | struct unix_address *addr = u->addr; | |
1503 | ||
1504 | *uaddr_len = addr->len; | |
1505 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1506 | } | |
1c92b4e5 | 1507 | unix_state_unlock(sk); |
1da177e4 LT |
1508 | sock_put(sk); |
1509 | out: | |
1510 | return err; | |
1511 | } | |
1512 | ||
1513 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1514 | { | |
1515 | int i; | |
1516 | ||
1517 | scm->fp = UNIXCB(skb).fp; | |
1da177e4 LT |
1518 | UNIXCB(skb).fp = NULL; |
1519 | ||
6eba6a37 | 1520 | for (i = scm->fp->count-1; i >= 0; i--) |
341f09c0 | 1521 | unix_notinflight(scm->fp->user, scm->fp->fp[i]); |
1da177e4 LT |
1522 | } |
1523 | ||
7361c36c | 1524 | static void unix_destruct_scm(struct sk_buff *skb) |
1da177e4 LT |
1525 | { |
1526 | struct scm_cookie scm; | |
1527 | memset(&scm, 0, sizeof(scm)); | |
7361c36c | 1528 | scm.pid = UNIXCB(skb).pid; |
7361c36c EB |
1529 | if (UNIXCB(skb).fp) |
1530 | unix_detach_fds(&scm, skb); | |
1da177e4 LT |
1531 | |
1532 | /* Alas, it calls VFS */ | |
1533 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1534 | scm_destroy(&scm); | |
1535 | sock_wfree(skb); | |
1536 | } | |
1537 | ||
df87da07 | 1538 | /* |
1539 | * The "user->unix_inflight" variable is protected by the garbage | |
1540 | * collection lock, and we just read it locklessly here. If you go | |
1541 | * over the limit, there might be a tiny race in actually noticing | |
1542 | * it across threads. Tough. | |
1543 | */ | |
1544 | static inline bool too_many_unix_fds(struct task_struct *p) | |
1545 | { | |
1546 | struct user_struct *user = current_user(); | |
1547 | ||
1548 | if (unlikely(user->unix_inflight > task_rlimit(p, RLIMIT_NOFILE))) | |
1549 | return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN); | |
1550 | return false; | |
1551 | } | |
1552 | ||
25888e30 ED |
1553 | #define MAX_RECURSION_LEVEL 4 |
1554 | ||
6209344f | 1555 | static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
1da177e4 LT |
1556 | { |
1557 | int i; | |
25888e30 ED |
1558 | unsigned char max_level = 0; |
1559 | int unix_sock_count = 0; | |
1560 | ||
df87da07 | 1561 | if (too_many_unix_fds(current)) |
1562 | return -ETOOMANYREFS; | |
1563 | ||
25888e30 ED |
1564 | for (i = scm->fp->count - 1; i >= 0; i--) { |
1565 | struct sock *sk = unix_get_socket(scm->fp->fp[i]); | |
1566 | ||
1567 | if (sk) { | |
1568 | unix_sock_count++; | |
1569 | max_level = max(max_level, | |
1570 | unix_sk(sk)->recursion_level); | |
1571 | } | |
1572 | } | |
1573 | if (unlikely(max_level > MAX_RECURSION_LEVEL)) | |
1574 | return -ETOOMANYREFS; | |
6209344f MS |
1575 | |
1576 | /* | |
1577 | * Need to duplicate file references for the sake of garbage | |
1578 | * collection. Otherwise a socket in the fps might become a | |
1579 | * candidate for GC while the skb is not yet queued. | |
1580 | */ | |
1581 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); | |
1582 | if (!UNIXCB(skb).fp) | |
1583 | return -ENOMEM; | |
1584 | ||
df87da07 | 1585 | for (i = scm->fp->count - 1; i >= 0; i--) |
341f09c0 | 1586 | unix_inflight(scm->fp->user, scm->fp->fp[i]); |
25888e30 | 1587 | return max_level; |
1da177e4 LT |
1588 | } |
1589 | ||
f78a5fda | 1590 | static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds) |
7361c36c EB |
1591 | { |
1592 | int err = 0; | |
16e57262 | 1593 | |
f78a5fda | 1594 | UNIXCB(skb).pid = get_pid(scm->pid); |
6b0ee8c0 EB |
1595 | UNIXCB(skb).uid = scm->creds.uid; |
1596 | UNIXCB(skb).gid = scm->creds.gid; | |
7361c36c EB |
1597 | UNIXCB(skb).fp = NULL; |
1598 | if (scm->fp && send_fds) | |
1599 | err = unix_attach_fds(scm, skb); | |
1600 | ||
1601 | skb->destructor = unix_destruct_scm; | |
1602 | return err; | |
1603 | } | |
1604 | ||
16e57262 ED |
1605 | /* |
1606 | * Some apps rely on write() giving SCM_CREDENTIALS | |
1607 | * We include credentials if source or destination socket | |
1608 | * asserted SOCK_PASSCRED. | |
1609 | */ | |
1610 | static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock, | |
1611 | const struct sock *other) | |
1612 | { | |
6b0ee8c0 | 1613 | if (UNIXCB(skb).pid) |
16e57262 ED |
1614 | return; |
1615 | if (test_bit(SOCK_PASSCRED, &sock->flags) || | |
25da0e3e EB |
1616 | !other->sk_socket || |
1617 | test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) { | |
16e57262 | 1618 | UNIXCB(skb).pid = get_pid(task_tgid(current)); |
6e0895c2 | 1619 | current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid); |
16e57262 ED |
1620 | } |
1621 | } | |
1622 | ||
1da177e4 LT |
1623 | /* |
1624 | * Send AF_UNIX data. | |
1625 | */ | |
1626 | ||
1627 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1628 | struct msghdr *msg, size_t len) | |
1629 | { | |
1630 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1631 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1632 | struct net *net = sock_net(sk); |
1da177e4 | 1633 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 1634 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 LT |
1635 | struct sock *other = NULL; |
1636 | int namelen = 0; /* fake GCC */ | |
1637 | int err; | |
95c96174 | 1638 | unsigned int hash; |
f78a5fda | 1639 | struct sk_buff *skb; |
1da177e4 LT |
1640 | long timeo; |
1641 | struct scm_cookie tmp_scm; | |
25888e30 | 1642 | int max_level; |
eb6a2481 | 1643 | int data_len = 0; |
4b9e9796 | 1644 | int sk_locked; |
1da177e4 LT |
1645 | |
1646 | if (NULL == siocb->scm) | |
1647 | siocb->scm = &tmp_scm; | |
5f23b734 | 1648 | wait_for_unix_gc(); |
e0e3cea4 | 1649 | err = scm_send(sock, msg, siocb->scm, false); |
1da177e4 LT |
1650 | if (err < 0) |
1651 | return err; | |
1652 | ||
1653 | err = -EOPNOTSUPP; | |
1654 | if (msg->msg_flags&MSG_OOB) | |
1655 | goto out; | |
1656 | ||
1657 | if (msg->msg_namelen) { | |
1658 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1659 | if (err < 0) | |
1660 | goto out; | |
1661 | namelen = err; | |
1662 | } else { | |
1663 | sunaddr = NULL; | |
1664 | err = -ENOTCONN; | |
1665 | other = unix_peer_get(sk); | |
1666 | if (!other) | |
1667 | goto out; | |
1668 | } | |
1669 | ||
f64f9e71 JP |
1670 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr |
1671 | && (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1672 | goto out; |
1673 | ||
1674 | err = -EMSGSIZE; | |
1675 | if (len > sk->sk_sndbuf - 32) | |
1676 | goto out; | |
1677 | ||
eb6a2481 ED |
1678 | if (len > SKB_MAX_ALLOC) |
1679 | data_len = min_t(size_t, | |
1680 | len - SKB_MAX_ALLOC, | |
1681 | MAX_SKB_FRAGS * PAGE_SIZE); | |
1682 | ||
1683 | skb = sock_alloc_send_pskb(sk, len - data_len, data_len, | |
1684 | msg->msg_flags & MSG_DONTWAIT, &err); | |
e27dfcea | 1685 | if (skb == NULL) |
1da177e4 LT |
1686 | goto out; |
1687 | ||
f78a5fda | 1688 | err = unix_scm_to_skb(siocb->scm, skb, true); |
25888e30 | 1689 | if (err < 0) |
7361c36c | 1690 | goto out_free; |
25888e30 | 1691 | max_level = err + 1; |
dc49c1f9 | 1692 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1693 | |
eb6a2481 ED |
1694 | skb_put(skb, len - data_len); |
1695 | skb->data_len = data_len; | |
1696 | skb->len = len; | |
1697 | err = skb_copy_datagram_from_iovec(skb, 0, msg->msg_iov, 0, len); | |
1da177e4 LT |
1698 | if (err) |
1699 | goto out_free; | |
1700 | ||
1701 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1702 | ||
1703 | restart: | |
1704 | if (!other) { | |
1705 | err = -ECONNRESET; | |
1706 | if (sunaddr == NULL) | |
1707 | goto out_free; | |
1708 | ||
097e66c5 | 1709 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 | 1710 | hash, &err); |
e27dfcea | 1711 | if (other == NULL) |
1da177e4 LT |
1712 | goto out_free; |
1713 | } | |
1714 | ||
d6ae3bae AC |
1715 | if (sk_filter(other, skb) < 0) { |
1716 | /* Toss the packet but do not return any error to the sender */ | |
1717 | err = len; | |
1718 | goto out_free; | |
1719 | } | |
1720 | ||
4b9e9796 | 1721 | sk_locked = 0; |
1c92b4e5 | 1722 | unix_state_lock(other); |
4b9e9796 | 1723 | restart_locked: |
1da177e4 LT |
1724 | err = -EPERM; |
1725 | if (!unix_may_send(sk, other)) | |
1726 | goto out_unlock; | |
1727 | ||
4b9e9796 | 1728 | if (unlikely(sock_flag(other, SOCK_DEAD))) { |
1da177e4 LT |
1729 | /* |
1730 | * Check with 1003.1g - what should | |
1731 | * datagram error | |
1732 | */ | |
1c92b4e5 | 1733 | unix_state_unlock(other); |
1da177e4 LT |
1734 | sock_put(other); |
1735 | ||
4b9e9796 | 1736 | if (!sk_locked) |
da8db083 RW |
1737 | unix_state_lock(sk); |
1738 | ||
1da177e4 | 1739 | err = 0; |
1da177e4 | 1740 | if (unix_peer(sk) == other) { |
e27dfcea | 1741 | unix_peer(sk) = NULL; |
4b9e9796 S |
1742 | unix_dgram_peer_wake_disconnect_wakeup(sk, other); |
1743 | ||
1c92b4e5 | 1744 | unix_state_unlock(sk); |
1da177e4 LT |
1745 | |
1746 | unix_dgram_disconnected(sk, other); | |
1747 | sock_put(other); | |
1748 | err = -ECONNREFUSED; | |
1749 | } else { | |
1c92b4e5 | 1750 | unix_state_unlock(sk); |
1da177e4 LT |
1751 | } |
1752 | ||
1753 | other = NULL; | |
1754 | if (err) | |
1755 | goto out_free; | |
1756 | goto restart; | |
1757 | } | |
1758 | ||
1759 | err = -EPIPE; | |
1760 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1761 | goto out_unlock; | |
1762 | ||
1763 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1764 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1765 | if (err) | |
1766 | goto out_unlock; | |
1767 | } | |
1768 | ||
4b9e9796 S |
1769 | /* other == sk && unix_peer(other) != sk if |
1770 | * - unix_peer(sk) == NULL, destination address bound to sk | |
1771 | * - unix_peer(sk) == sk by time of get but disconnected before lock | |
1772 | */ | |
1773 | if (other != sk && | |
1774 | unlikely(unix_peer(other) != sk && unix_recvq_full(other))) { | |
1775 | if (timeo) { | |
1776 | timeo = unix_wait_for_peer(other, timeo); | |
1777 | ||
1778 | err = sock_intr_errno(timeo); | |
1779 | if (signal_pending(current)) | |
1780 | goto out_free; | |
1781 | ||
1782 | goto restart; | |
1da177e4 LT |
1783 | } |
1784 | ||
4b9e9796 S |
1785 | if (!sk_locked) { |
1786 | unix_state_unlock(other); | |
1787 | unix_state_double_lock(sk, other); | |
1788 | } | |
1da177e4 | 1789 | |
4b9e9796 S |
1790 | if (unix_peer(sk) != other || |
1791 | unix_dgram_peer_wake_me(sk, other)) { | |
1792 | err = -EAGAIN; | |
1793 | sk_locked = 1; | |
1794 | goto out_unlock; | |
1795 | } | |
1da177e4 | 1796 | |
4b9e9796 S |
1797 | if (!sk_locked) { |
1798 | sk_locked = 1; | |
1799 | goto restart_locked; | |
1800 | } | |
1da177e4 LT |
1801 | } |
1802 | ||
4b9e9796 S |
1803 | if (unlikely(sk_locked)) |
1804 | unix_state_unlock(sk); | |
1805 | ||
3f66116e AC |
1806 | if (sock_flag(other, SOCK_RCVTSTAMP)) |
1807 | __net_timestamp(skb); | |
16e57262 | 1808 | maybe_add_creds(skb, sock, other); |
1da177e4 | 1809 | skb_queue_tail(&other->sk_receive_queue, skb); |
25888e30 ED |
1810 | if (max_level > unix_sk(other)->recursion_level) |
1811 | unix_sk(other)->recursion_level = max_level; | |
1c92b4e5 | 1812 | unix_state_unlock(other); |
1da177e4 LT |
1813 | other->sk_data_ready(other, len); |
1814 | sock_put(other); | |
f78a5fda | 1815 | scm_destroy(siocb->scm); |
6fa3eb70 | 1816 | |
1da177e4 LT |
1817 | return len; |
1818 | ||
1819 | out_unlock: | |
4b9e9796 S |
1820 | if (sk_locked) |
1821 | unix_state_unlock(sk); | |
1c92b4e5 | 1822 | unix_state_unlock(other); |
1da177e4 LT |
1823 | out_free: |
1824 | kfree_skb(skb); | |
1825 | out: | |
1826 | if (other) | |
1827 | sock_put(other); | |
f78a5fda | 1828 | scm_destroy(siocb->scm); |
6fa3eb70 | 1829 | |
1da177e4 LT |
1830 | return err; |
1831 | } | |
1832 | ||
ac7bfa62 | 1833 | |
1da177e4 LT |
1834 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
1835 | struct msghdr *msg, size_t len) | |
1836 | { | |
1837 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1838 | struct sock *sk = sock->sk; | |
1839 | struct sock *other = NULL; | |
6eba6a37 | 1840 | int err, size; |
f78a5fda | 1841 | struct sk_buff *skb; |
e27dfcea | 1842 | int sent = 0; |
1da177e4 | 1843 | struct scm_cookie tmp_scm; |
8ba69ba6 | 1844 | bool fds_sent = false; |
25888e30 | 1845 | int max_level; |
1da177e4 LT |
1846 | |
1847 | if (NULL == siocb->scm) | |
1848 | siocb->scm = &tmp_scm; | |
6fa3eb70 | 1849 | |
5f23b734 | 1850 | wait_for_unix_gc(); |
e0e3cea4 | 1851 | err = scm_send(sock, msg, siocb->scm, false); |
1da177e4 LT |
1852 | if (err < 0) |
1853 | return err; | |
1854 | ||
1855 | err = -EOPNOTSUPP; | |
1856 | if (msg->msg_flags&MSG_OOB) | |
1857 | goto out_err; | |
1858 | ||
1859 | if (msg->msg_namelen) { | |
1860 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1861 | goto out_err; | |
1862 | } else { | |
1da177e4 | 1863 | err = -ENOTCONN; |
830a1e5c | 1864 | other = unix_peer(sk); |
1da177e4 LT |
1865 | if (!other) |
1866 | goto out_err; | |
1867 | } | |
1868 | ||
1869 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1870 | goto pipe_err; | |
1871 | ||
6eba6a37 | 1872 | while (sent < len) { |
1da177e4 | 1873 | /* |
e9df7d7f BL |
1874 | * Optimisation for the fact that under 0.01% of X |
1875 | * messages typically need breaking up. | |
1da177e4 LT |
1876 | */ |
1877 | ||
e9df7d7f | 1878 | size = len-sent; |
1da177e4 LT |
1879 | |
1880 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1881 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1882 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1883 | |
1884 | if (size > SKB_MAX_ALLOC) | |
1885 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1886 | |
1da177e4 LT |
1887 | /* |
1888 | * Grab a buffer | |
1889 | */ | |
ac7bfa62 | 1890 | |
6eba6a37 ED |
1891 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, |
1892 | &err); | |
6fa3eb70 | 1893 | |
1da177e4 | 1894 | |
e27dfcea | 1895 | if (skb == NULL) |
1da177e4 LT |
1896 | goto out_err; |
1897 | ||
1898 | /* | |
1899 | * If you pass two values to the sock_alloc_send_skb | |
1900 | * it tries to grab the large buffer with GFP_NOFS | |
1901 | * (which can fail easily), and if it fails grab the | |
1902 | * fallback size buffer which is under a page and will | |
1903 | * succeed. [Alan] | |
1904 | */ | |
1905 | size = min_t(int, size, skb_tailroom(skb)); | |
1906 | ||
7361c36c | 1907 | |
f78a5fda DM |
1908 | /* Only send the fds in the first buffer */ |
1909 | err = unix_scm_to_skb(siocb->scm, skb, !fds_sent); | |
25888e30 | 1910 | if (err < 0) { |
7361c36c | 1911 | kfree_skb(skb); |
f78a5fda | 1912 | goto out_err; |
6209344f | 1913 | } |
25888e30 | 1914 | max_level = err + 1; |
7361c36c | 1915 | fds_sent = true; |
1da177e4 | 1916 | |
6eba6a37 ED |
1917 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
1918 | if (err) { | |
1da177e4 | 1919 | kfree_skb(skb); |
f78a5fda | 1920 | goto out_err; |
1da177e4 LT |
1921 | } |
1922 | ||
1c92b4e5 | 1923 | unix_state_lock(other); |
1da177e4 LT |
1924 | |
1925 | if (sock_flag(other, SOCK_DEAD) || | |
1926 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
6fa3eb70 S |
1927 | { |
1928 | if( other->sk_socket ) | |
1929 | { | |
1930 | if(sk->sk_socket) | |
1931 | { | |
1932 | ||
1933 | #ifdef CONFIG_MTK_NET_LOGGING | |
1934 | printk(KERN_INFO " [mtk_net][unix]: sendmsg[%lu:%lu]:peer close\n" ,SOCK_INODE(sk->sk_socket)->i_ino,SOCK_INODE(other->sk_socket)->i_ino); | |
1935 | #endif | |
1936 | } | |
1937 | else{ | |
1938 | #ifdef CONFIG_MTK_NET_LOGGING | |
1939 | printk(KERN_INFO " [mtk_net][unix]: sendmsg[null:%lu]:peer close\n" ,SOCK_INODE(other->sk_socket)->i_ino); | |
1940 | #endif | |
1941 | } | |
1942 | ||
1943 | } | |
1944 | else | |
1945 | { | |
1946 | #ifdef CONFIG_MTK_NET_LOGGING | |
1947 | printk(KERN_INFO " [mtk_net][unix]: sendmsg:peer close \n" ); | |
1948 | #endif | |
1949 | } | |
1950 | ||
1951 | ||
1da177e4 | 1952 | goto pipe_err_free; |
6fa3eb70 | 1953 | } |
1da177e4 | 1954 | |
16e57262 | 1955 | maybe_add_creds(skb, sock, other); |
1da177e4 | 1956 | skb_queue_tail(&other->sk_receive_queue, skb); |
25888e30 ED |
1957 | if (max_level > unix_sk(other)->recursion_level) |
1958 | unix_sk(other)->recursion_level = max_level; | |
1c92b4e5 | 1959 | unix_state_unlock(other); |
1da177e4 | 1960 | other->sk_data_ready(other, size); |
e27dfcea | 1961 | sent += size; |
1da177e4 | 1962 | } |
1da177e4 | 1963 | |
f78a5fda | 1964 | scm_destroy(siocb->scm); |
1da177e4 LT |
1965 | siocb->scm = NULL; |
1966 | ||
1967 | return sent; | |
1968 | ||
1969 | pipe_err_free: | |
1c92b4e5 | 1970 | unix_state_unlock(other); |
1da177e4 LT |
1971 | kfree_skb(skb); |
1972 | pipe_err: | |
6eba6a37 ED |
1973 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
1974 | send_sig(SIGPIPE, current, 0); | |
1da177e4 LT |
1975 | err = -EPIPE; |
1976 | out_err: | |
f78a5fda | 1977 | scm_destroy(siocb->scm); |
1da177e4 | 1978 | siocb->scm = NULL; |
6fa3eb70 | 1979 | |
1da177e4 LT |
1980 | return sent ? : err; |
1981 | } | |
1982 | ||
1983 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1984 | struct msghdr *msg, size_t len) | |
1985 | { | |
1986 | int err; | |
1987 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1988 | |
1da177e4 LT |
1989 | err = sock_error(sk); |
1990 | if (err) | |
1991 | return err; | |
1992 | ||
1993 | if (sk->sk_state != TCP_ESTABLISHED) | |
1994 | return -ENOTCONN; | |
1995 | ||
1996 | if (msg->msg_namelen) | |
1997 | msg->msg_namelen = 0; | |
1998 | ||
1999 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
2000 | } | |
ac7bfa62 | 2001 | |
a05d2ad1 EB |
2002 | static int unix_seqpacket_recvmsg(struct kiocb *iocb, struct socket *sock, |
2003 | struct msghdr *msg, size_t size, | |
2004 | int flags) | |
2005 | { | |
2006 | struct sock *sk = sock->sk; | |
2007 | ||
2008 | if (sk->sk_state != TCP_ESTABLISHED) | |
2009 | return -ENOTCONN; | |
2010 | ||
2011 | return unix_dgram_recvmsg(iocb, sock, msg, size, flags); | |
2012 | } | |
2013 | ||
1da177e4 LT |
2014 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
2015 | { | |
2016 | struct unix_sock *u = unix_sk(sk); | |
2017 | ||
1da177e4 LT |
2018 | if (u->addr) { |
2019 | msg->msg_namelen = u->addr->len; | |
2020 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
2021 | } | |
2022 | } | |
2023 | ||
2024 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
2025 | struct msghdr *msg, size_t size, | |
2026 | int flags) | |
2027 | { | |
2028 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
2029 | struct scm_cookie tmp_scm; | |
2030 | struct sock *sk = sock->sk; | |
2031 | struct unix_sock *u = unix_sk(sk); | |
2032 | int noblock = flags & MSG_DONTWAIT; | |
2033 | struct sk_buff *skb; | |
2034 | int err; | |
f55bb7f9 | 2035 | int peeked, skip; |
1da177e4 LT |
2036 | |
2037 | err = -EOPNOTSUPP; | |
2038 | if (flags&MSG_OOB) | |
2039 | goto out; | |
2040 | ||
85ec9232 WT |
2041 | err = mutex_lock_interruptible(&u->readlock); |
2042 | if (unlikely(err)) { | |
2043 | /* recvmsg() in non blocking mode is supposed to return -EAGAIN | |
2044 | * sk_rcvtimeo is not honored by mutex_lock_interruptible() | |
2045 | */ | |
2046 | err = noblock ? -EAGAIN : -ERESTARTSYS; | |
2047 | goto out; | |
2048 | } | |
1da177e4 | 2049 | |
f55bb7f9 PE |
2050 | skip = sk_peek_offset(sk, flags); |
2051 | ||
2052 | skb = __skb_recv_datagram(sk, flags, &peeked, &skip, &err); | |
0a112258 FZ |
2053 | if (!skb) { |
2054 | unix_state_lock(sk); | |
2055 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
2056 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
2057 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
2058 | err = 0; | |
2059 | unix_state_unlock(sk); | |
1da177e4 | 2060 | goto out_unlock; |
0a112258 | 2061 | } |
1da177e4 | 2062 | |
67426b75 ED |
2063 | wake_up_interruptible_sync_poll(&u->peer_wait, |
2064 | POLLOUT | POLLWRNORM | POLLWRBAND); | |
1da177e4 LT |
2065 | |
2066 | if (msg->msg_name) | |
2067 | unix_copy_addr(msg, skb->sk); | |
2068 | ||
f55bb7f9 PE |
2069 | if (size > skb->len - skip) |
2070 | size = skb->len - skip; | |
2071 | else if (size < skb->len - skip) | |
1da177e4 LT |
2072 | msg->msg_flags |= MSG_TRUNC; |
2073 | ||
f55bb7f9 | 2074 | err = skb_copy_datagram_iovec(skb, skip, msg->msg_iov, size); |
1da177e4 LT |
2075 | if (err) |
2076 | goto out_free; | |
2077 | ||
3f66116e AC |
2078 | if (sock_flag(sk, SOCK_RCVTSTAMP)) |
2079 | __sock_recv_timestamp(msg, sk, skb); | |
2080 | ||
1da177e4 LT |
2081 | if (!siocb->scm) { |
2082 | siocb->scm = &tmp_scm; | |
2083 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
2084 | } | |
6b0ee8c0 | 2085 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); |
877ce7c1 | 2086 | unix_set_secdata(siocb->scm, skb); |
1da177e4 | 2087 | |
6eba6a37 | 2088 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
2089 | if (UNIXCB(skb).fp) |
2090 | unix_detach_fds(siocb->scm, skb); | |
f55bb7f9 PE |
2091 | |
2092 | sk_peek_offset_bwd(sk, skb->len); | |
6eba6a37 | 2093 | } else { |
1da177e4 LT |
2094 | /* It is questionable: on PEEK we could: |
2095 | - do not return fds - good, but too simple 8) | |
2096 | - return fds, and do not return them on read (old strategy, | |
2097 | apparently wrong) | |
2098 | - clone fds (I chose it for now, it is the most universal | |
2099 | solution) | |
ac7bfa62 YH |
2100 | |
2101 | POSIX 1003.1g does not actually define this clearly | |
2102 | at all. POSIX 1003.1g doesn't define a lot of things | |
2103 | clearly however! | |
2104 | ||
1da177e4 | 2105 | */ |
f55bb7f9 PE |
2106 | |
2107 | sk_peek_offset_fwd(sk, size); | |
2108 | ||
1da177e4 LT |
2109 | if (UNIXCB(skb).fp) |
2110 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
2111 | } | |
9f6f9af7 | 2112 | err = (flags & MSG_TRUNC) ? skb->len - skip : size; |
1da177e4 LT |
2113 | |
2114 | scm_recv(sock, msg, siocb->scm, flags); | |
2115 | ||
2116 | out_free: | |
6eba6a37 | 2117 | skb_free_datagram(sk, skb); |
1da177e4 | 2118 | out_unlock: |
57b47a53 | 2119 | mutex_unlock(&u->readlock); |
1da177e4 | 2120 | out: |
6fa3eb70 | 2121 | |
1da177e4 LT |
2122 | return err; |
2123 | } | |
2124 | ||
2125 | /* | |
79f632c7 | 2126 | * Sleep until more data has arrived. But check for races.. |
1da177e4 | 2127 | */ |
79f632c7 BP |
2128 | static long unix_stream_data_wait(struct sock *sk, long timeo, |
2129 | struct sk_buff *last) | |
1da177e4 LT |
2130 | { |
2131 | DEFINE_WAIT(wait); | |
2132 | ||
1c92b4e5 | 2133 | unix_state_lock(sk); |
1da177e4 LT |
2134 | |
2135 | for (;;) { | |
aa395145 | 2136 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 | 2137 | |
79f632c7 | 2138 | if (skb_peek_tail(&sk->sk_receive_queue) != last || |
1da177e4 LT |
2139 | sk->sk_err || |
2140 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
2141 | signal_pending(current) || | |
2142 | !timeo) | |
2143 | break; | |
2144 | ||
2145 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 2146 | unix_state_unlock(sk); |
6fa3eb70 | 2147 | timeo = freezable_schedule_timeout(timeo); |
1c92b4e5 | 2148 | unix_state_lock(sk); |
7659c934 MS |
2149 | |
2150 | if (sock_flag(sk, SOCK_DEAD)) | |
2151 | break; | |
2152 | ||
1da177e4 LT |
2153 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
2154 | } | |
2155 | ||
aa395145 | 2156 | finish_wait(sk_sleep(sk), &wait); |
1c92b4e5 | 2157 | unix_state_unlock(sk); |
1da177e4 LT |
2158 | return timeo; |
2159 | } | |
2160 | ||
1da177e4 LT |
2161 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, |
2162 | struct msghdr *msg, size_t size, | |
2163 | int flags) | |
2164 | { | |
2165 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
2166 | struct scm_cookie tmp_scm; | |
2167 | struct sock *sk = sock->sk; | |
2168 | struct unix_sock *u = unix_sk(sk); | |
e27dfcea | 2169 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 | 2170 | int copied = 0; |
f423fefe | 2171 | int noblock = flags & MSG_DONTWAIT; |
1da177e4 LT |
2172 | int check_creds = 0; |
2173 | int target; | |
2174 | int err = 0; | |
2175 | long timeo; | |
fc0d7536 | 2176 | int skip; |
6fa3eb70 | 2177 | struct sock * other = unix_peer(sk); |
1da177e4 LT |
2178 | |
2179 | err = -EINVAL; | |
2180 | if (sk->sk_state != TCP_ESTABLISHED) | |
2181 | goto out; | |
2182 | ||
2183 | err = -EOPNOTSUPP; | |
2184 | if (flags&MSG_OOB) | |
2185 | goto out; | |
2186 | ||
2187 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
f423fefe | 2188 | timeo = sock_rcvtimeo(sk, noblock); |
1da177e4 | 2189 | |
1da177e4 LT |
2190 | /* Lock the socket to prevent queue disordering |
2191 | * while sleeps in memcpy_tomsg | |
2192 | */ | |
2193 | ||
2194 | if (!siocb->scm) { | |
2195 | siocb->scm = &tmp_scm; | |
2196 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
2197 | } | |
2198 | ||
85ec9232 | 2199 | mutex_lock(&u->readlock); |
1da177e4 | 2200 | |
6eba6a37 | 2201 | do { |
1da177e4 | 2202 | int chunk; |
79f632c7 | 2203 | struct sk_buff *skb, *last; |
1da177e4 | 2204 | |
3c0d2f37 | 2205 | unix_state_lock(sk); |
7659c934 MS |
2206 | if (sock_flag(sk, SOCK_DEAD)) { |
2207 | err = -ECONNRESET; | |
2208 | goto unlock; | |
2209 | } | |
79f632c7 | 2210 | last = skb = skb_peek(&sk->sk_receive_queue); |
fc0d7536 | 2211 | again: |
6eba6a37 | 2212 | if (skb == NULL) { |
25888e30 | 2213 | unix_sk(sk)->recursion_level = 0; |
1da177e4 | 2214 | if (copied >= target) |
3c0d2f37 | 2215 | goto unlock; |
1da177e4 LT |
2216 | |
2217 | /* | |
2218 | * POSIX 1003.1g mandates this order. | |
2219 | */ | |
ac7bfa62 | 2220 | |
6eba6a37 ED |
2221 | err = sock_error(sk); |
2222 | if (err) | |
3c0d2f37 | 2223 | goto unlock; |
1da177e4 | 2224 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
6fa3eb70 S |
2225 | { |
2226 | if(sk && sk->sk_socket ) | |
2227 | { | |
2228 | if(other && other->sk_socket ){ | |
2229 | #ifdef CONFIG_MTK_NET_LOGGING | |
2230 | ||
2231 | printk(KERN_INFO " [mtk_net][unix]: recvmsg[%lu:%lu]:exit read due to peer shutdown \n" ,SOCK_INODE(sk->sk_socket)->i_ino,SOCK_INODE(other->sk_socket)->i_ino); | |
2232 | #endif | |
2233 | }else{ | |
2234 | #ifdef CONFIG_MTK_NET_LOGGING | |
2235 | printk(KERN_INFO "[mtk_net][unix]: recvmsg[%lu:null]:exit read due to peer shutdown \n" ,SOCK_INODE(sk->sk_socket)->i_ino); | |
2236 | #endif | |
2237 | } | |
2238 | } | |
2239 | else{ | |
2240 | #ifdef CONFIG_MTK_NET_LOGGING | |
2241 | printk(KERN_INFO " [mtk_net][unix]: recvmsg: exit read due to peer shutdown \n" ); | |
2242 | #endif | |
2243 | } | |
3c0d2f37 | 2244 | goto unlock; |
6fa3eb70 | 2245 | } |
3c0d2f37 | 2246 | unix_state_unlock(sk); |
1da177e4 LT |
2247 | err = -EAGAIN; |
2248 | if (!timeo) | |
2249 | break; | |
57b47a53 | 2250 | mutex_unlock(&u->readlock); |
1da177e4 | 2251 | |
79f632c7 | 2252 | timeo = unix_stream_data_wait(sk, timeo, last); |
6fa3eb70 S |
2253 | if (!timeo) |
2254 | { | |
2255 | if(sk && sk->sk_socket ) | |
2256 | { | |
2257 | if(other && other->sk_socket ){ | |
2258 | #ifdef CONFIG_MTK_NET_LOGGING | |
2259 | printk(KERN_INFO " [mtk_net][unix]: recvmsg[%lu:%lu]:exit read due to timeout \n" ,SOCK_INODE(sk->sk_socket)->i_ino,SOCK_INODE(other->sk_socket)->i_ino); | |
2260 | #endif | |
2261 | }else{ | |
2262 | #ifdef CONFIG_MTK_NET_LOGGING | |
2263 | printk(KERN_INFO " [mtk_net][unix]: recvmsg[%lu:null]:exit read due to timeout \n" ,SOCK_INODE(sk->sk_socket)->i_ino); | |
2264 | #endif | |
2265 | } | |
2266 | } | |
2267 | else | |
2268 | { | |
2269 | #ifdef CONFIG_MTK_NET_LOGGING | |
2270 | printk(KERN_INFO " [mtk_net][unix]: recvmsg:exit read due to timeout \n" ); | |
2271 | #endif | |
2272 | } | |
2273 | ||
2274 | } | |
1da177e4 | 2275 | |
3a57e783 | 2276 | if (signal_pending(current)) { |
1da177e4 LT |
2277 | err = sock_intr_errno(timeo); |
2278 | goto out; | |
2279 | } | |
b3ca9b02 | 2280 | |
3a57e783 | 2281 | mutex_lock(&u->readlock); |
1da177e4 | 2282 | continue; |
3c0d2f37 MS |
2283 | unlock: |
2284 | unix_state_unlock(sk); | |
2285 | break; | |
1da177e4 | 2286 | } |
fc0d7536 | 2287 | |
79f632c7 BP |
2288 | skip = sk_peek_offset(sk, flags); |
2289 | while (skip >= skb->len) { | |
fc0d7536 | 2290 | skip -= skb->len; |
79f632c7 | 2291 | last = skb; |
fc0d7536 | 2292 | skb = skb_peek_next(skb, &sk->sk_receive_queue); |
79f632c7 BP |
2293 | if (!skb) |
2294 | goto again; | |
fc0d7536 PE |
2295 | } |
2296 | ||
3c0d2f37 | 2297 | unix_state_unlock(sk); |
1da177e4 LT |
2298 | |
2299 | if (check_creds) { | |
2300 | /* Never glue messages from different writers */ | |
7361c36c | 2301 | if ((UNIXCB(skb).pid != siocb->scm->pid) || |
6b0ee8c0 EB |
2302 | !uid_eq(UNIXCB(skb).uid, siocb->scm->creds.uid) || |
2303 | !gid_eq(UNIXCB(skb).gid, siocb->scm->creds.gid)) | |
1da177e4 | 2304 | break; |
0e82e7f6 | 2305 | } else if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
1da177e4 | 2306 | /* Copy credentials */ |
6b0ee8c0 | 2307 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); |
1da177e4 LT |
2308 | check_creds = 1; |
2309 | } | |
2310 | ||
2311 | /* Copy address just once */ | |
6eba6a37 | 2312 | if (sunaddr) { |
1da177e4 LT |
2313 | unix_copy_addr(msg, skb->sk); |
2314 | sunaddr = NULL; | |
2315 | } | |
2316 | ||
fc0d7536 PE |
2317 | chunk = min_t(unsigned int, skb->len - skip, size); |
2318 | if (memcpy_toiovec(msg->msg_iov, skb->data + skip, chunk)) { | |
1da177e4 LT |
2319 | if (copied == 0) |
2320 | copied = -EFAULT; | |
2321 | break; | |
2322 | } | |
2323 | copied += chunk; | |
2324 | size -= chunk; | |
2325 | ||
2326 | /* Mark read part of skb as used */ | |
6eba6a37 | 2327 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
2328 | skb_pull(skb, chunk); |
2329 | ||
fc0d7536 PE |
2330 | sk_peek_offset_bwd(sk, chunk); |
2331 | ||
1da177e4 LT |
2332 | if (UNIXCB(skb).fp) |
2333 | unix_detach_fds(siocb->scm, skb); | |
2334 | ||
6f01fd6e | 2335 | if (skb->len) |
1da177e4 | 2336 | break; |
1da177e4 | 2337 | |
6f01fd6e | 2338 | skb_unlink(skb, &sk->sk_receive_queue); |
70d4bf6d | 2339 | consume_skb(skb); |
1da177e4 LT |
2340 | |
2341 | if (siocb->scm->fp) | |
2342 | break; | |
6eba6a37 | 2343 | } else { |
1da177e4 LT |
2344 | /* It is questionable, see note in unix_dgram_recvmsg. |
2345 | */ | |
2346 | if (UNIXCB(skb).fp) | |
2347 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
2348 | ||
1f21dc67 AC |
2349 | if (skip) { |
2350 | sk_peek_offset_fwd(sk, chunk); | |
2351 | skip -= chunk; | |
2352 | } | |
2353 | ||
2354 | if (UNIXCB(skb).fp) | |
2355 | break; | |
fc0d7536 | 2356 | |
1f21dc67 AC |
2357 | last = skb; |
2358 | unix_state_lock(sk); | |
2359 | skb = skb_peek_next(skb, &sk->sk_receive_queue); | |
2360 | if (skb) | |
2361 | goto again; | |
2362 | unix_state_unlock(sk); | |
1da177e4 LT |
2363 | break; |
2364 | } | |
2365 | } while (size); | |
2366 | ||
57b47a53 | 2367 | mutex_unlock(&u->readlock); |
1da177e4 LT |
2368 | scm_recv(sock, msg, siocb->scm, flags); |
2369 | out: | |
6fa3eb70 | 2370 | |
1da177e4 LT |
2371 | return copied ? : err; |
2372 | } | |
2373 | ||
2374 | static int unix_shutdown(struct socket *sock, int mode) | |
2375 | { | |
2376 | struct sock *sk = sock->sk; | |
2377 | struct sock *other; | |
2378 | ||
fc61b928 XW |
2379 | if (mode < SHUT_RD || mode > SHUT_RDWR) |
2380 | return -EINVAL; | |
2381 | /* This maps: | |
2382 | * SHUT_RD (0) -> RCV_SHUTDOWN (1) | |
2383 | * SHUT_WR (1) -> SEND_SHUTDOWN (2) | |
2384 | * SHUT_RDWR (2) -> SHUTDOWN_MASK (3) | |
2385 | */ | |
2386 | ++mode; | |
7180a031 AC |
2387 | |
2388 | unix_state_lock(sk); | |
2389 | sk->sk_shutdown |= mode; | |
2390 | other = unix_peer(sk); | |
2391 | if (other) | |
2392 | sock_hold(other); | |
2393 | unix_state_unlock(sk); | |
2394 | sk->sk_state_change(sk); | |
2395 | ||
2396 | if (other && | |
2397 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
2398 | ||
2399 | int peer_mode = 0; | |
2400 | ||
2401 | if (mode&RCV_SHUTDOWN) | |
2402 | peer_mode |= SEND_SHUTDOWN; | |
2403 | if (mode&SEND_SHUTDOWN) | |
2404 | peer_mode |= RCV_SHUTDOWN; | |
2405 | unix_state_lock(other); | |
2406 | other->sk_shutdown |= peer_mode; | |
2407 | unix_state_unlock(other); | |
2408 | other->sk_state_change(other); | |
2409 | if (peer_mode == SHUTDOWN_MASK) | |
2410 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); | |
2411 | else if (peer_mode & RCV_SHUTDOWN) | |
2412 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); | |
1da177e4 | 2413 | } |
7180a031 AC |
2414 | if (other) |
2415 | sock_put(other); | |
2416 | ||
1da177e4 LT |
2417 | return 0; |
2418 | } | |
2419 | ||
885ee74d PE |
2420 | long unix_inq_len(struct sock *sk) |
2421 | { | |
2422 | struct sk_buff *skb; | |
2423 | long amount = 0; | |
2424 | ||
2425 | if (sk->sk_state == TCP_LISTEN) | |
2426 | return -EINVAL; | |
2427 | ||
2428 | spin_lock(&sk->sk_receive_queue.lock); | |
2429 | if (sk->sk_type == SOCK_STREAM || | |
2430 | sk->sk_type == SOCK_SEQPACKET) { | |
2431 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
2432 | amount += skb->len; | |
2433 | } else { | |
2434 | skb = skb_peek(&sk->sk_receive_queue); | |
2435 | if (skb) | |
2436 | amount = skb->len; | |
2437 | } | |
2438 | spin_unlock(&sk->sk_receive_queue.lock); | |
2439 | ||
2440 | return amount; | |
2441 | } | |
2442 | EXPORT_SYMBOL_GPL(unix_inq_len); | |
2443 | ||
2444 | long unix_outq_len(struct sock *sk) | |
2445 | { | |
2446 | return sk_wmem_alloc_get(sk); | |
2447 | } | |
2448 | EXPORT_SYMBOL_GPL(unix_outq_len); | |
2449 | ||
1da177e4 LT |
2450 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
2451 | { | |
2452 | struct sock *sk = sock->sk; | |
e27dfcea | 2453 | long amount = 0; |
1da177e4 LT |
2454 | int err; |
2455 | ||
6eba6a37 ED |
2456 | switch (cmd) { |
2457 | case SIOCOUTQ: | |
885ee74d | 2458 | amount = unix_outq_len(sk); |
6eba6a37 ED |
2459 | err = put_user(amount, (int __user *)arg); |
2460 | break; | |
2461 | case SIOCINQ: | |
885ee74d PE |
2462 | amount = unix_inq_len(sk); |
2463 | if (amount < 0) | |
2464 | err = amount; | |
2465 | else | |
1da177e4 | 2466 | err = put_user(amount, (int __user *)arg); |
885ee74d | 2467 | break; |
6eba6a37 ED |
2468 | default: |
2469 | err = -ENOIOCTLCMD; | |
2470 | break; | |
1da177e4 LT |
2471 | } |
2472 | return err; | |
2473 | } | |
2474 | ||
6eba6a37 | 2475 | static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 LT |
2476 | { |
2477 | struct sock *sk = sock->sk; | |
2478 | unsigned int mask; | |
2479 | ||
aa395145 | 2480 | sock_poll_wait(file, sk_sleep(sk), wait); |
1da177e4 LT |
2481 | mask = 0; |
2482 | ||
2483 | /* exceptional events? */ | |
2484 | if (sk->sk_err) | |
2485 | mask |= POLLERR; | |
2486 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
2487 | mask |= POLLHUP; | |
f348d70a | 2488 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
db40980f | 2489 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
1da177e4 LT |
2490 | |
2491 | /* readable? */ | |
db40980f | 2492 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
2493 | mask |= POLLIN | POLLRDNORM; |
2494 | ||
2495 | /* Connection-based need to check for termination and startup */ | |
6eba6a37 ED |
2496 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
2497 | sk->sk_state == TCP_CLOSE) | |
1da177e4 LT |
2498 | mask |= POLLHUP; |
2499 | ||
2500 | /* | |
2501 | * we set writable also when the other side has shut down the | |
2502 | * connection. This prevents stuck sockets. | |
2503 | */ | |
2504 | if (unix_writable(sk)) | |
2505 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
2506 | ||
2507 | return mask; | |
2508 | } | |
2509 | ||
ec0d215f RW |
2510 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
2511 | poll_table *wait) | |
3c73419c | 2512 | { |
ec0d215f RW |
2513 | struct sock *sk = sock->sk, *other; |
2514 | unsigned int mask, writable; | |
3c73419c | 2515 | |
aa395145 | 2516 | sock_poll_wait(file, sk_sleep(sk), wait); |
3c73419c RW |
2517 | mask = 0; |
2518 | ||
2519 | /* exceptional events? */ | |
2520 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 2521 | mask |= POLLERR | |
8facd5fb | 2522 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
7d4c04fc | 2523 | |
3c73419c | 2524 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
5456f09a | 2525 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
3c73419c RW |
2526 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
2527 | mask |= POLLHUP; | |
2528 | ||
2529 | /* readable? */ | |
5456f09a | 2530 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
3c73419c RW |
2531 | mask |= POLLIN | POLLRDNORM; |
2532 | ||
2533 | /* Connection-based need to check for termination and startup */ | |
2534 | if (sk->sk_type == SOCK_SEQPACKET) { | |
2535 | if (sk->sk_state == TCP_CLOSE) | |
2536 | mask |= POLLHUP; | |
2537 | /* connection hasn't started yet? */ | |
2538 | if (sk->sk_state == TCP_SYN_SENT) | |
6fa3eb70 S |
2539 | { |
2540 | ||
3c73419c | 2541 | return mask; |
6fa3eb70 S |
2542 | } |
2543 | } | |
3c73419c | 2544 | |
973a34aa | 2545 | /* No write status requested, avoid expensive OUT tests. */ |
626cf236 | 2546 | if (!(poll_requested_events(wait) & (POLLWRBAND|POLLWRNORM|POLLOUT))) |
6fa3eb70 | 2547 | { |
973a34aa | 2548 | return mask; |
6fa3eb70 | 2549 | } |
973a34aa | 2550 | |
ec0d215f | 2551 | writable = unix_writable(sk); |
4b9e9796 S |
2552 | if (writable) { |
2553 | unix_state_lock(sk); | |
2554 | ||
2555 | other = unix_peer(sk); | |
2556 | if (other && unix_peer(other) != sk && | |
2557 | unix_recvq_full(other) && | |
2558 | unix_dgram_peer_wake_me(sk, other)) | |
2559 | writable = 0; | |
2560 | ||
2561 | unix_state_unlock(sk); | |
ec0d215f RW |
2562 | } |
2563 | ||
2564 | if (writable) | |
3c73419c RW |
2565 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
2566 | else | |
2567 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
2568 | ||
3c73419c RW |
2569 | return mask; |
2570 | } | |
1da177e4 LT |
2571 | |
2572 | #ifdef CONFIG_PROC_FS | |
a53eb3fe | 2573 | |
7123aaa3 ED |
2574 | #define BUCKET_SPACE (BITS_PER_LONG - (UNIX_HASH_BITS + 1) - 1) |
2575 | ||
2576 | #define get_bucket(x) ((x) >> BUCKET_SPACE) | |
2577 | #define get_offset(x) ((x) & ((1L << BUCKET_SPACE) - 1)) | |
2578 | #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) | |
a53eb3fe | 2579 | |
7123aaa3 | 2580 | static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos) |
1da177e4 | 2581 | { |
7123aaa3 ED |
2582 | unsigned long offset = get_offset(*pos); |
2583 | unsigned long bucket = get_bucket(*pos); | |
2584 | struct sock *sk; | |
2585 | unsigned long count = 0; | |
1da177e4 | 2586 | |
7123aaa3 ED |
2587 | for (sk = sk_head(&unix_socket_table[bucket]); sk; sk = sk_next(sk)) { |
2588 | if (sock_net(sk) != seq_file_net(seq)) | |
097e66c5 | 2589 | continue; |
7123aaa3 ED |
2590 | if (++count == offset) |
2591 | break; | |
2592 | } | |
2593 | ||
2594 | return sk; | |
2595 | } | |
2596 | ||
2597 | static struct sock *unix_next_socket(struct seq_file *seq, | |
2598 | struct sock *sk, | |
2599 | loff_t *pos) | |
2600 | { | |
2601 | unsigned long bucket; | |
2602 | ||
2603 | while (sk > (struct sock *)SEQ_START_TOKEN) { | |
2604 | sk = sk_next(sk); | |
2605 | if (!sk) | |
2606 | goto next_bucket; | |
2607 | if (sock_net(sk) == seq_file_net(seq)) | |
2608 | return sk; | |
1da177e4 | 2609 | } |
7123aaa3 ED |
2610 | |
2611 | do { | |
2612 | sk = unix_from_bucket(seq, pos); | |
2613 | if (sk) | |
2614 | return sk; | |
2615 | ||
2616 | next_bucket: | |
2617 | bucket = get_bucket(*pos) + 1; | |
2618 | *pos = set_bucket_offset(bucket, 1); | |
2619 | } while (bucket < ARRAY_SIZE(unix_socket_table)); | |
2620 | ||
1da177e4 LT |
2621 | return NULL; |
2622 | } | |
2623 | ||
1da177e4 | 2624 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2625 | __acquires(unix_table_lock) |
1da177e4 | 2626 | { |
fbe9cc4a | 2627 | spin_lock(&unix_table_lock); |
7123aaa3 ED |
2628 | |
2629 | if (!*pos) | |
2630 | return SEQ_START_TOKEN; | |
2631 | ||
2632 | if (get_bucket(*pos) >= ARRAY_SIZE(unix_socket_table)) | |
2633 | return NULL; | |
2634 | ||
2635 | return unix_next_socket(seq, NULL, pos); | |
1da177e4 LT |
2636 | } |
2637 | ||
2638 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2639 | { | |
2640 | ++*pos; | |
7123aaa3 | 2641 | return unix_next_socket(seq, v, pos); |
1da177e4 LT |
2642 | } |
2643 | ||
2644 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2645 | __releases(unix_table_lock) |
1da177e4 | 2646 | { |
fbe9cc4a | 2647 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2648 | } |
2649 | ||
2650 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2651 | { | |
ac7bfa62 | 2652 | |
b9f3124f | 2653 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2654 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2655 | "Inode Path\n"); | |
2656 | else { | |
2657 | struct sock *s = v; | |
2658 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2659 | unix_state_lock(s); |
1da177e4 | 2660 | |
71338aa7 | 2661 | seq_printf(seq, "%pK: %08X %08X %08X %04X %02X %5lu", |
1da177e4 LT |
2662 | s, |
2663 | atomic_read(&s->sk_refcnt), | |
2664 | 0, | |
2665 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2666 | s->sk_type, | |
2667 | s->sk_socket ? | |
2668 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2669 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2670 | sock_i_ino(s)); | |
2671 | ||
2672 | if (u->addr) { | |
2673 | int i, len; | |
2674 | seq_putc(seq, ' '); | |
2675 | ||
2676 | i = 0; | |
2677 | len = u->addr->len - sizeof(short); | |
2678 | if (!UNIX_ABSTRACT(s)) | |
2679 | len--; | |
2680 | else { | |
2681 | seq_putc(seq, '@'); | |
2682 | i++; | |
2683 | } | |
2684 | for ( ; i < len; i++) | |
2685 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2686 | } | |
1c92b4e5 | 2687 | unix_state_unlock(s); |
1da177e4 LT |
2688 | seq_putc(seq, '\n'); |
2689 | } | |
2690 | ||
2691 | return 0; | |
2692 | } | |
2693 | ||
56b3d975 | 2694 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2695 | .start = unix_seq_start, |
2696 | .next = unix_seq_next, | |
2697 | .stop = unix_seq_stop, | |
2698 | .show = unix_seq_show, | |
2699 | }; | |
2700 | ||
1da177e4 LT |
2701 | static int unix_seq_open(struct inode *inode, struct file *file) |
2702 | { | |
e372c414 | 2703 | return seq_open_net(inode, file, &unix_seq_ops, |
8b51b064 | 2704 | sizeof(struct seq_net_private)); |
1da177e4 LT |
2705 | } |
2706 | ||
da7071d7 | 2707 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2708 | .owner = THIS_MODULE, |
2709 | .open = unix_seq_open, | |
2710 | .read = seq_read, | |
2711 | .llseek = seq_lseek, | |
e372c414 | 2712 | .release = seq_release_net, |
1da177e4 LT |
2713 | }; |
2714 | ||
2715 | #endif | |
2716 | ||
ec1b4cf7 | 2717 | static const struct net_proto_family unix_family_ops = { |
1da177e4 LT |
2718 | .family = PF_UNIX, |
2719 | .create = unix_create, | |
2720 | .owner = THIS_MODULE, | |
2721 | }; | |
2722 | ||
097e66c5 | 2723 | |
2c8c1e72 | 2724 | static int __net_init unix_net_init(struct net *net) |
097e66c5 DL |
2725 | { |
2726 | int error = -ENOMEM; | |
2727 | ||
a0a53c8b | 2728 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2729 | if (unix_sysctl_register(net)) |
2730 | goto out; | |
d392e497 | 2731 | |
097e66c5 | 2732 | #ifdef CONFIG_PROC_FS |
d4beaa66 | 2733 | if (!proc_create("unix", 0, net->proc_net, &unix_seq_fops)) { |
1597fbc0 | 2734 | unix_sysctl_unregister(net); |
097e66c5 | 2735 | goto out; |
1597fbc0 | 2736 | } |
097e66c5 DL |
2737 | #endif |
2738 | error = 0; | |
2739 | out: | |
48dcc33e | 2740 | return error; |
097e66c5 DL |
2741 | } |
2742 | ||
2c8c1e72 | 2743 | static void __net_exit unix_net_exit(struct net *net) |
097e66c5 | 2744 | { |
1597fbc0 | 2745 | unix_sysctl_unregister(net); |
ece31ffd | 2746 | remove_proc_entry("unix", net->proc_net); |
097e66c5 DL |
2747 | } |
2748 | ||
2749 | static struct pernet_operations unix_net_ops = { | |
2750 | .init = unix_net_init, | |
2751 | .exit = unix_net_exit, | |
2752 | }; | |
2753 | ||
1da177e4 LT |
2754 | static int __init af_unix_init(void) |
2755 | { | |
2756 | int rc = -1; | |
1da177e4 | 2757 | |
b4fff5f8 | 2758 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
1da177e4 LT |
2759 | |
2760 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2761 | if (rc != 0) { |
2762 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
0dc47877 | 2763 | __func__); |
1da177e4 LT |
2764 | goto out; |
2765 | } | |
2766 | ||
2767 | sock_register(&unix_family_ops); | |
097e66c5 | 2768 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2769 | out: |
2770 | return rc; | |
2771 | } | |
2772 | ||
2773 | static void __exit af_unix_exit(void) | |
2774 | { | |
2775 | sock_unregister(PF_UNIX); | |
1da177e4 | 2776 | proto_unregister(&unix_proto); |
097e66c5 | 2777 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2778 | } |
2779 | ||
3d366960 DW |
2780 | /* Earlier than device_initcall() so that other drivers invoking |
2781 | request_module() don't end up in a loop when modprobe tries | |
2782 | to use a UNIX socket. But later than subsys_initcall() because | |
2783 | we depend on stuff initialised there */ | |
2784 | fs_initcall(af_unix_init); | |
1da177e4 LT |
2785 | module_exit(af_unix_exit); |
2786 | ||
2787 | MODULE_LICENSE("GPL"); | |
2788 | MODULE_ALIAS_NETPROTO(PF_UNIX); |