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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET4: Implementation of BSD Unix domain sockets. | |
3 | * | |
113aa838 | 4 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
1da177e4 LT |
11 | * Fixes: |
12 | * Linus Torvalds : Assorted bug cures. | |
13 | * Niibe Yutaka : async I/O support. | |
14 | * Carsten Paeth : PF_UNIX check, address fixes. | |
15 | * Alan Cox : Limit size of allocated blocks. | |
16 | * Alan Cox : Fixed the stupid socketpair bug. | |
17 | * Alan Cox : BSD compatibility fine tuning. | |
18 | * Alan Cox : Fixed a bug in connect when interrupted. | |
19 | * Alan Cox : Sorted out a proper draft version of | |
20 | * file descriptor passing hacked up from | |
21 | * Mike Shaver's work. | |
22 | * Marty Leisner : Fixes to fd passing | |
23 | * Nick Nevin : recvmsg bugfix. | |
24 | * Alan Cox : Started proper garbage collector | |
25 | * Heiko EiBfeldt : Missing verify_area check | |
26 | * Alan Cox : Started POSIXisms | |
27 | * Andreas Schwab : Replace inode by dentry for proper | |
28 | * reference counting | |
29 | * Kirk Petersen : Made this a module | |
30 | * Christoph Rohland : Elegant non-blocking accept/connect algorithm. | |
31 | * Lots of bug fixes. | |
32 | * Alexey Kuznetosv : Repaired (I hope) bugs introduces | |
33 | * by above two patches. | |
34 | * Andrea Arcangeli : If possible we block in connect(2) | |
35 | * if the max backlog of the listen socket | |
36 | * is been reached. This won't break | |
37 | * old apps and it will avoid huge amount | |
38 | * of socks hashed (this for unix_gc() | |
39 | * performances reasons). | |
40 | * Security fix that limits the max | |
41 | * number of socks to 2*max_files and | |
42 | * the number of skb queueable in the | |
43 | * dgram receiver. | |
44 | * Artur Skawina : Hash function optimizations | |
45 | * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8) | |
46 | * Malcolm Beattie : Set peercred for socketpair | |
47 | * Michal Ostrowski : Module initialization cleanup. | |
48 | * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT, | |
49 | * the core infrastructure is doing that | |
50 | * for all net proto families now (2.5.69+) | |
51 | * | |
52 | * | |
53 | * Known differences from reference BSD that was tested: | |
54 | * | |
55 | * [TO FIX] | |
56 | * ECONNREFUSED is not returned from one end of a connected() socket to the | |
57 | * other the moment one end closes. | |
58 | * fstat() doesn't return st_dev=0, and give the blksize as high water mark | |
59 | * and a fake inode identifier (nor the BSD first socket fstat twice bug). | |
60 | * [NOT TO FIX] | |
61 | * accept() returns a path name even if the connecting socket has closed | |
62 | * in the meantime (BSD loses the path and gives up). | |
63 | * accept() returns 0 length path for an unbound connector. BSD returns 16 | |
64 | * and a null first byte in the path (but not for gethost/peername - BSD bug ??) | |
65 | * socketpair(...SOCK_RAW..) doesn't panic the kernel. | |
66 | * BSD af_unix apparently has connect forgetting to block properly. | |
67 | * (need to check this with the POSIX spec in detail) | |
68 | * | |
69 | * Differences from 2.0.0-11-... (ANK) | |
70 | * Bug fixes and improvements. | |
71 | * - client shutdown killed server socket. | |
72 | * - removed all useless cli/sti pairs. | |
73 | * | |
74 | * Semantic changes/extensions. | |
75 | * - generic control message passing. | |
76 | * - SCM_CREDENTIALS control message. | |
77 | * - "Abstract" (not FS based) socket bindings. | |
78 | * Abstract names are sequences of bytes (not zero terminated) | |
79 | * started by 0, so that this name space does not intersect | |
80 | * with BSD names. | |
81 | */ | |
82 | ||
83 | #include <linux/module.h> | |
1da177e4 | 84 | #include <linux/kernel.h> |
1da177e4 LT |
85 | #include <linux/signal.h> |
86 | #include <linux/sched.h> | |
87 | #include <linux/errno.h> | |
88 | #include <linux/string.h> | |
89 | #include <linux/stat.h> | |
90 | #include <linux/dcache.h> | |
91 | #include <linux/namei.h> | |
92 | #include <linux/socket.h> | |
93 | #include <linux/un.h> | |
94 | #include <linux/fcntl.h> | |
95 | #include <linux/termios.h> | |
96 | #include <linux/sockios.h> | |
97 | #include <linux/net.h> | |
98 | #include <linux/in.h> | |
99 | #include <linux/fs.h> | |
100 | #include <linux/slab.h> | |
101 | #include <asm/uaccess.h> | |
102 | #include <linux/skbuff.h> | |
103 | #include <linux/netdevice.h> | |
457c4cbc | 104 | #include <net/net_namespace.h> |
1da177e4 | 105 | #include <net/sock.h> |
c752f073 | 106 | #include <net/tcp_states.h> |
1da177e4 LT |
107 | #include <net/af_unix.h> |
108 | #include <linux/proc_fs.h> | |
109 | #include <linux/seq_file.h> | |
110 | #include <net/scm.h> | |
111 | #include <linux/init.h> | |
112 | #include <linux/poll.h> | |
1da177e4 LT |
113 | #include <linux/rtnetlink.h> |
114 | #include <linux/mount.h> | |
115 | #include <net/checksum.h> | |
116 | #include <linux/security.h> | |
117 | ||
13111698 AB |
118 | static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; |
119 | static DEFINE_SPINLOCK(unix_table_lock); | |
1da177e4 LT |
120 | static atomic_t unix_nr_socks = ATOMIC_INIT(0); |
121 | ||
122 | #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) | |
123 | ||
124 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE) | |
125 | ||
877ce7c1 | 126 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 127 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 128 | { |
dc49c1f9 | 129 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
877ce7c1 CZ |
130 | } |
131 | ||
132 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
133 | { | |
dc49c1f9 | 134 | scm->secid = *UNIXSID(skb); |
877ce7c1 CZ |
135 | } |
136 | #else | |
dc49c1f9 | 137 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
138 | { } |
139 | ||
140 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
141 | { } | |
142 | #endif /* CONFIG_SECURITY_NETWORK */ | |
143 | ||
1da177e4 LT |
144 | /* |
145 | * SMP locking strategy: | |
fbe9cc4a | 146 | * hash table is protected with spinlock unix_table_lock |
663717f6 | 147 | * each socket state is protected by separate spin lock. |
1da177e4 LT |
148 | */ |
149 | ||
44bb9363 | 150 | static inline unsigned unix_hash_fold(__wsum n) |
1da177e4 | 151 | { |
44bb9363 | 152 | unsigned hash = (__force unsigned)n; |
1da177e4 LT |
153 | hash ^= hash>>16; |
154 | hash ^= hash>>8; | |
155 | return hash&(UNIX_HASH_SIZE-1); | |
156 | } | |
157 | ||
158 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
159 | ||
160 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
161 | { | |
162 | return unix_peer(osk) == sk; | |
163 | } | |
164 | ||
165 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
166 | { | |
6eba6a37 | 167 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
1da177e4 LT |
168 | } |
169 | ||
3c73419c RW |
170 | static inline int unix_recvq_full(struct sock const *sk) |
171 | { | |
172 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static struct sock *unix_peer_get(struct sock *s) |
176 | { | |
177 | struct sock *peer; | |
178 | ||
1c92b4e5 | 179 | unix_state_lock(s); |
1da177e4 LT |
180 | peer = unix_peer(s); |
181 | if (peer) | |
182 | sock_hold(peer); | |
1c92b4e5 | 183 | unix_state_unlock(s); |
1da177e4 LT |
184 | return peer; |
185 | } | |
186 | ||
187 | static inline void unix_release_addr(struct unix_address *addr) | |
188 | { | |
189 | if (atomic_dec_and_test(&addr->refcnt)) | |
190 | kfree(addr); | |
191 | } | |
192 | ||
193 | /* | |
194 | * Check unix socket name: | |
195 | * - should be not zero length. | |
196 | * - if started by not zero, should be NULL terminated (FS object) | |
197 | * - if started by zero, it is abstract name. | |
198 | */ | |
ac7bfa62 | 199 | |
6eba6a37 | 200 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned *hashp) |
1da177e4 LT |
201 | { |
202 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
203 | return -EINVAL; | |
204 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
205 | return -EINVAL; | |
206 | if (sunaddr->sun_path[0]) { | |
207 | /* | |
208 | * This may look like an off by one error but it is a bit more | |
209 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
210 | * sun_path[108] doesnt as such exist. However in kernel space | |
211 | * we are guaranteed that it is a valid memory location in our | |
212 | * kernel address buffer. | |
213 | */ | |
e27dfcea | 214 | ((char *)sunaddr)[len] = 0; |
1da177e4 LT |
215 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
216 | return len; | |
217 | } | |
218 | ||
07f0757a | 219 | *hashp = unix_hash_fold(csum_partial(sunaddr, len, 0)); |
1da177e4 LT |
220 | return len; |
221 | } | |
222 | ||
223 | static void __unix_remove_socket(struct sock *sk) | |
224 | { | |
225 | sk_del_node_init(sk); | |
226 | } | |
227 | ||
228 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
229 | { | |
547b792c | 230 | WARN_ON(!sk_unhashed(sk)); |
1da177e4 LT |
231 | sk_add_node(sk, list); |
232 | } | |
233 | ||
234 | static inline void unix_remove_socket(struct sock *sk) | |
235 | { | |
fbe9cc4a | 236 | spin_lock(&unix_table_lock); |
1da177e4 | 237 | __unix_remove_socket(sk); |
fbe9cc4a | 238 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
239 | } |
240 | ||
241 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
242 | { | |
fbe9cc4a | 243 | spin_lock(&unix_table_lock); |
1da177e4 | 244 | __unix_insert_socket(list, sk); |
fbe9cc4a | 245 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
246 | } |
247 | ||
097e66c5 DL |
248 | static struct sock *__unix_find_socket_byname(struct net *net, |
249 | struct sockaddr_un *sunname, | |
1da177e4 LT |
250 | int len, int type, unsigned hash) |
251 | { | |
252 | struct sock *s; | |
253 | struct hlist_node *node; | |
254 | ||
255 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { | |
256 | struct unix_sock *u = unix_sk(s); | |
257 | ||
878628fb | 258 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
259 | continue; |
260 | ||
1da177e4 LT |
261 | if (u->addr->len == len && |
262 | !memcmp(u->addr->name, sunname, len)) | |
263 | goto found; | |
264 | } | |
265 | s = NULL; | |
266 | found: | |
267 | return s; | |
268 | } | |
269 | ||
097e66c5 DL |
270 | static inline struct sock *unix_find_socket_byname(struct net *net, |
271 | struct sockaddr_un *sunname, | |
1da177e4 LT |
272 | int len, int type, |
273 | unsigned hash) | |
274 | { | |
275 | struct sock *s; | |
276 | ||
fbe9cc4a | 277 | spin_lock(&unix_table_lock); |
097e66c5 | 278 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
279 | if (s) |
280 | sock_hold(s); | |
fbe9cc4a | 281 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
282 | return s; |
283 | } | |
284 | ||
6616f788 | 285 | static struct sock *unix_find_socket_byinode(struct inode *i) |
1da177e4 LT |
286 | { |
287 | struct sock *s; | |
288 | struct hlist_node *node; | |
289 | ||
fbe9cc4a | 290 | spin_lock(&unix_table_lock); |
1da177e4 LT |
291 | sk_for_each(s, node, |
292 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { | |
293 | struct dentry *dentry = unix_sk(s)->dentry; | |
294 | ||
6eba6a37 | 295 | if (dentry && dentry->d_inode == i) { |
1da177e4 LT |
296 | sock_hold(s); |
297 | goto found; | |
298 | } | |
299 | } | |
300 | s = NULL; | |
301 | found: | |
fbe9cc4a | 302 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
303 | return s; |
304 | } | |
305 | ||
306 | static inline int unix_writable(struct sock *sk) | |
307 | { | |
308 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
309 | } | |
310 | ||
311 | static void unix_write_space(struct sock *sk) | |
312 | { | |
43815482 ED |
313 | struct socket_wq *wq; |
314 | ||
315 | rcu_read_lock(); | |
1da177e4 | 316 | if (unix_writable(sk)) { |
43815482 ED |
317 | wq = rcu_dereference(sk->sk_wq); |
318 | if (wq_has_sleeper(wq)) | |
319 | wake_up_interruptible_sync(&wq->wait); | |
8d8ad9d7 | 320 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 | 321 | } |
43815482 | 322 | rcu_read_unlock(); |
1da177e4 LT |
323 | } |
324 | ||
325 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
326 | * queue of packets arrived from previous peer. First, it allows to do | |
327 | * flow control based only on wmem_alloc; second, sk connected to peer | |
328 | * may receive messages only from that peer. */ | |
329 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
330 | { | |
b03efcfb | 331 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
332 | skb_queue_purge(&sk->sk_receive_queue); |
333 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
334 | ||
335 | /* If one link of bidirectional dgram pipe is disconnected, | |
336 | * we signal error. Messages are lost. Do not make this, | |
337 | * when peer was not connected to us. | |
338 | */ | |
339 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
340 | other->sk_err = ECONNRESET; | |
341 | other->sk_error_report(other); | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | static void unix_sock_destructor(struct sock *sk) | |
347 | { | |
348 | struct unix_sock *u = unix_sk(sk); | |
349 | ||
350 | skb_queue_purge(&sk->sk_receive_queue); | |
351 | ||
547b792c IJ |
352 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
353 | WARN_ON(!sk_unhashed(sk)); | |
354 | WARN_ON(sk->sk_socket); | |
1da177e4 | 355 | if (!sock_flag(sk, SOCK_DEAD)) { |
6b41e7dd | 356 | printk(KERN_INFO "Attempt to release alive unix socket: %p\n", sk); |
1da177e4 LT |
357 | return; |
358 | } | |
359 | ||
360 | if (u->addr) | |
361 | unix_release_addr(u->addr); | |
362 | ||
363 | atomic_dec(&unix_nr_socks); | |
6f756a8c | 364 | local_bh_disable(); |
a8076d8d | 365 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
6f756a8c | 366 | local_bh_enable(); |
1da177e4 | 367 | #ifdef UNIX_REFCNT_DEBUG |
6eba6a37 ED |
368 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, |
369 | atomic_read(&unix_nr_socks)); | |
1da177e4 LT |
370 | #endif |
371 | } | |
372 | ||
6eba6a37 | 373 | static int unix_release_sock(struct sock *sk, int embrion) |
1da177e4 LT |
374 | { |
375 | struct unix_sock *u = unix_sk(sk); | |
376 | struct dentry *dentry; | |
377 | struct vfsmount *mnt; | |
378 | struct sock *skpair; | |
379 | struct sk_buff *skb; | |
380 | int state; | |
381 | ||
382 | unix_remove_socket(sk); | |
383 | ||
384 | /* Clear state */ | |
1c92b4e5 | 385 | unix_state_lock(sk); |
1da177e4 LT |
386 | sock_orphan(sk); |
387 | sk->sk_shutdown = SHUTDOWN_MASK; | |
388 | dentry = u->dentry; | |
389 | u->dentry = NULL; | |
390 | mnt = u->mnt; | |
391 | u->mnt = NULL; | |
392 | state = sk->sk_state; | |
393 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 394 | unix_state_unlock(sk); |
1da177e4 LT |
395 | |
396 | wake_up_interruptible_all(&u->peer_wait); | |
397 | ||
e27dfcea | 398 | skpair = unix_peer(sk); |
1da177e4 | 399 | |
e27dfcea | 400 | if (skpair != NULL) { |
1da177e4 | 401 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
1c92b4e5 | 402 | unix_state_lock(skpair); |
1da177e4 LT |
403 | /* No more writes */ |
404 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
405 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
406 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 407 | unix_state_unlock(skpair); |
1da177e4 | 408 | skpair->sk_state_change(skpair); |
8d8ad9d7 | 409 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 LT |
410 | } |
411 | sock_put(skpair); /* It may now die */ | |
412 | unix_peer(sk) = NULL; | |
413 | } | |
414 | ||
415 | /* Try to flush out this socket. Throw out buffers at least */ | |
416 | ||
417 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e27dfcea | 418 | if (state == TCP_LISTEN) |
1da177e4 LT |
419 | unix_release_sock(skb->sk, 1); |
420 | /* passed fds are erased in the kfree_skb hook */ | |
421 | kfree_skb(skb); | |
422 | } | |
423 | ||
424 | if (dentry) { | |
425 | dput(dentry); | |
426 | mntput(mnt); | |
427 | } | |
428 | ||
429 | sock_put(sk); | |
430 | ||
431 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
432 | ||
433 | /* | |
434 | * Fixme: BSD difference: In BSD all sockets connected to use get | |
435 | * ECONNRESET and we die on the spot. In Linux we behave | |
436 | * like files and pipes do and wait for the last | |
437 | * dereference. | |
438 | * | |
439 | * Can't we simply set sock->err? | |
440 | * | |
441 | * What the above comment does talk about? --ANK(980817) | |
442 | */ | |
443 | ||
9305cfa4 | 444 | if (unix_tot_inflight) |
ac7bfa62 | 445 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
446 | |
447 | return 0; | |
448 | } | |
449 | ||
109f6e39 EB |
450 | static void init_peercred(struct sock *sk) |
451 | { | |
452 | put_pid(sk->sk_peer_pid); | |
453 | if (sk->sk_peer_cred) | |
454 | put_cred(sk->sk_peer_cred); | |
455 | sk->sk_peer_pid = get_pid(task_tgid(current)); | |
456 | sk->sk_peer_cred = get_current_cred(); | |
457 | } | |
458 | ||
459 | static void copy_peercred(struct sock *sk, struct sock *peersk) | |
460 | { | |
461 | put_pid(sk->sk_peer_pid); | |
462 | if (sk->sk_peer_cred) | |
463 | put_cred(sk->sk_peer_cred); | |
464 | sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); | |
465 | sk->sk_peer_cred = get_cred(peersk->sk_peer_cred); | |
466 | } | |
467 | ||
1da177e4 LT |
468 | static int unix_listen(struct socket *sock, int backlog) |
469 | { | |
470 | int err; | |
471 | struct sock *sk = sock->sk; | |
472 | struct unix_sock *u = unix_sk(sk); | |
109f6e39 EB |
473 | struct pid *old_pid = NULL; |
474 | const struct cred *old_cred = NULL; | |
1da177e4 LT |
475 | |
476 | err = -EOPNOTSUPP; | |
6eba6a37 ED |
477 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
478 | goto out; /* Only stream/seqpacket sockets accept */ | |
1da177e4 LT |
479 | err = -EINVAL; |
480 | if (!u->addr) | |
6eba6a37 | 481 | goto out; /* No listens on an unbound socket */ |
1c92b4e5 | 482 | unix_state_lock(sk); |
1da177e4 LT |
483 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
484 | goto out_unlock; | |
485 | if (backlog > sk->sk_max_ack_backlog) | |
486 | wake_up_interruptible_all(&u->peer_wait); | |
487 | sk->sk_max_ack_backlog = backlog; | |
488 | sk->sk_state = TCP_LISTEN; | |
489 | /* set credentials so connect can copy them */ | |
109f6e39 | 490 | init_peercred(sk); |
1da177e4 LT |
491 | err = 0; |
492 | ||
493 | out_unlock: | |
1c92b4e5 | 494 | unix_state_unlock(sk); |
109f6e39 EB |
495 | put_pid(old_pid); |
496 | if (old_cred) | |
497 | put_cred(old_cred); | |
1da177e4 LT |
498 | out: |
499 | return err; | |
500 | } | |
501 | ||
502 | static int unix_release(struct socket *); | |
503 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
504 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
505 | int addr_len, int flags); | |
506 | static int unix_socketpair(struct socket *, struct socket *); | |
507 | static int unix_accept(struct socket *, struct socket *, int); | |
508 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
509 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
ec0d215f RW |
510 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
511 | poll_table *); | |
1da177e4 LT |
512 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
513 | static int unix_shutdown(struct socket *, int); | |
514 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
515 | struct msghdr *, size_t); | |
516 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
517 | struct msghdr *, size_t, int); | |
518 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
519 | struct msghdr *, size_t); | |
520 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
521 | struct msghdr *, size_t, int); | |
522 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
523 | int, int); | |
524 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
525 | struct msghdr *, size_t); | |
526 | ||
90ddc4f0 | 527 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
528 | .family = PF_UNIX, |
529 | .owner = THIS_MODULE, | |
530 | .release = unix_release, | |
531 | .bind = unix_bind, | |
532 | .connect = unix_stream_connect, | |
533 | .socketpair = unix_socketpair, | |
534 | .accept = unix_accept, | |
535 | .getname = unix_getname, | |
536 | .poll = unix_poll, | |
537 | .ioctl = unix_ioctl, | |
538 | .listen = unix_listen, | |
539 | .shutdown = unix_shutdown, | |
540 | .setsockopt = sock_no_setsockopt, | |
541 | .getsockopt = sock_no_getsockopt, | |
542 | .sendmsg = unix_stream_sendmsg, | |
543 | .recvmsg = unix_stream_recvmsg, | |
544 | .mmap = sock_no_mmap, | |
545 | .sendpage = sock_no_sendpage, | |
546 | }; | |
547 | ||
90ddc4f0 | 548 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
549 | .family = PF_UNIX, |
550 | .owner = THIS_MODULE, | |
551 | .release = unix_release, | |
552 | .bind = unix_bind, | |
553 | .connect = unix_dgram_connect, | |
554 | .socketpair = unix_socketpair, | |
555 | .accept = sock_no_accept, | |
556 | .getname = unix_getname, | |
ec0d215f | 557 | .poll = unix_dgram_poll, |
1da177e4 LT |
558 | .ioctl = unix_ioctl, |
559 | .listen = sock_no_listen, | |
560 | .shutdown = unix_shutdown, | |
561 | .setsockopt = sock_no_setsockopt, | |
562 | .getsockopt = sock_no_getsockopt, | |
563 | .sendmsg = unix_dgram_sendmsg, | |
564 | .recvmsg = unix_dgram_recvmsg, | |
565 | .mmap = sock_no_mmap, | |
566 | .sendpage = sock_no_sendpage, | |
567 | }; | |
568 | ||
90ddc4f0 | 569 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
570 | .family = PF_UNIX, |
571 | .owner = THIS_MODULE, | |
572 | .release = unix_release, | |
573 | .bind = unix_bind, | |
574 | .connect = unix_stream_connect, | |
575 | .socketpair = unix_socketpair, | |
576 | .accept = unix_accept, | |
577 | .getname = unix_getname, | |
ec0d215f | 578 | .poll = unix_dgram_poll, |
1da177e4 LT |
579 | .ioctl = unix_ioctl, |
580 | .listen = unix_listen, | |
581 | .shutdown = unix_shutdown, | |
582 | .setsockopt = sock_no_setsockopt, | |
583 | .getsockopt = sock_no_getsockopt, | |
584 | .sendmsg = unix_seqpacket_sendmsg, | |
585 | .recvmsg = unix_dgram_recvmsg, | |
586 | .mmap = sock_no_mmap, | |
587 | .sendpage = sock_no_sendpage, | |
588 | }; | |
589 | ||
590 | static struct proto unix_proto = { | |
248969ae ED |
591 | .name = "UNIX", |
592 | .owner = THIS_MODULE, | |
248969ae | 593 | .obj_size = sizeof(struct unix_sock), |
1da177e4 LT |
594 | }; |
595 | ||
a09785a2 IM |
596 | /* |
597 | * AF_UNIX sockets do not interact with hardware, hence they | |
598 | * dont trigger interrupts - so it's safe for them to have | |
599 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
600 | * this special lock-class by reinitializing the spinlock key: | |
601 | */ | |
602 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
603 | ||
6eba6a37 | 604 | static struct sock *unix_create1(struct net *net, struct socket *sock) |
1da177e4 LT |
605 | { |
606 | struct sock *sk = NULL; | |
607 | struct unix_sock *u; | |
608 | ||
284b327b PE |
609 | atomic_inc(&unix_nr_socks); |
610 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
611 | goto out; |
612 | ||
6257ff21 | 613 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
1da177e4 LT |
614 | if (!sk) |
615 | goto out; | |
616 | ||
6eba6a37 | 617 | sock_init_data(sock, sk); |
a09785a2 IM |
618 | lockdep_set_class(&sk->sk_receive_queue.lock, |
619 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
620 | |
621 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 622 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
623 | sk->sk_destruct = unix_sock_destructor; |
624 | u = unix_sk(sk); | |
625 | u->dentry = NULL; | |
626 | u->mnt = NULL; | |
fd19f329 | 627 | spin_lock_init(&u->lock); |
516e0cc5 | 628 | atomic_long_set(&u->inflight, 0); |
1fd05ba5 | 629 | INIT_LIST_HEAD(&u->link); |
57b47a53 | 630 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 LT |
631 | init_waitqueue_head(&u->peer_wait); |
632 | unix_insert_socket(unix_sockets_unbound, sk); | |
633 | out: | |
284b327b PE |
634 | if (sk == NULL) |
635 | atomic_dec(&unix_nr_socks); | |
920de804 ED |
636 | else { |
637 | local_bh_disable(); | |
a8076d8d | 638 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
920de804 ED |
639 | local_bh_enable(); |
640 | } | |
1da177e4 LT |
641 | return sk; |
642 | } | |
643 | ||
3f378b68 EP |
644 | static int unix_create(struct net *net, struct socket *sock, int protocol, |
645 | int kern) | |
1da177e4 LT |
646 | { |
647 | if (protocol && protocol != PF_UNIX) | |
648 | return -EPROTONOSUPPORT; | |
649 | ||
650 | sock->state = SS_UNCONNECTED; | |
651 | ||
652 | switch (sock->type) { | |
653 | case SOCK_STREAM: | |
654 | sock->ops = &unix_stream_ops; | |
655 | break; | |
656 | /* | |
657 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
658 | * nothing uses it. | |
659 | */ | |
660 | case SOCK_RAW: | |
e27dfcea | 661 | sock->type = SOCK_DGRAM; |
1da177e4 LT |
662 | case SOCK_DGRAM: |
663 | sock->ops = &unix_dgram_ops; | |
664 | break; | |
665 | case SOCK_SEQPACKET: | |
666 | sock->ops = &unix_seqpacket_ops; | |
667 | break; | |
668 | default: | |
669 | return -ESOCKTNOSUPPORT; | |
670 | } | |
671 | ||
1b8d7ae4 | 672 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
1da177e4 LT |
673 | } |
674 | ||
675 | static int unix_release(struct socket *sock) | |
676 | { | |
677 | struct sock *sk = sock->sk; | |
678 | ||
679 | if (!sk) | |
680 | return 0; | |
681 | ||
682 | sock->sk = NULL; | |
683 | ||
6eba6a37 | 684 | return unix_release_sock(sk, 0); |
1da177e4 LT |
685 | } |
686 | ||
687 | static int unix_autobind(struct socket *sock) | |
688 | { | |
689 | struct sock *sk = sock->sk; | |
3b1e0a65 | 690 | struct net *net = sock_net(sk); |
1da177e4 LT |
691 | struct unix_sock *u = unix_sk(sk); |
692 | static u32 ordernum = 1; | |
6eba6a37 | 693 | struct unix_address *addr; |
1da177e4 LT |
694 | int err; |
695 | ||
57b47a53 | 696 | mutex_lock(&u->readlock); |
1da177e4 LT |
697 | |
698 | err = 0; | |
699 | if (u->addr) | |
700 | goto out; | |
701 | ||
702 | err = -ENOMEM; | |
0da974f4 | 703 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
704 | if (!addr) |
705 | goto out; | |
706 | ||
1da177e4 LT |
707 | addr->name->sun_family = AF_UNIX; |
708 | atomic_set(&addr->refcnt, 1); | |
709 | ||
710 | retry: | |
711 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
07f0757a | 712 | addr->hash = unix_hash_fold(csum_partial(addr->name, addr->len, 0)); |
1da177e4 | 713 | |
fbe9cc4a | 714 | spin_lock(&unix_table_lock); |
1da177e4 LT |
715 | ordernum = (ordernum+1)&0xFFFFF; |
716 | ||
097e66c5 | 717 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 718 | addr->hash)) { |
fbe9cc4a | 719 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
720 | /* Sanity yield. It is unusual case, but yet... */ |
721 | if (!(ordernum&0xFF)) | |
722 | yield(); | |
723 | goto retry; | |
724 | } | |
725 | addr->hash ^= sk->sk_type; | |
726 | ||
727 | __unix_remove_socket(sk); | |
728 | u->addr = addr; | |
729 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 730 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
731 | err = 0; |
732 | ||
57b47a53 | 733 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
734 | return err; |
735 | } | |
736 | ||
097e66c5 DL |
737 | static struct sock *unix_find_other(struct net *net, |
738 | struct sockaddr_un *sunname, int len, | |
1da177e4 LT |
739 | int type, unsigned hash, int *error) |
740 | { | |
741 | struct sock *u; | |
421748ec | 742 | struct path path; |
1da177e4 | 743 | int err = 0; |
ac7bfa62 | 744 | |
1da177e4 | 745 | if (sunname->sun_path[0]) { |
421748ec AV |
746 | struct inode *inode; |
747 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); | |
1da177e4 LT |
748 | if (err) |
749 | goto fail; | |
421748ec AV |
750 | inode = path.dentry->d_inode; |
751 | err = inode_permission(inode, MAY_WRITE); | |
1da177e4 LT |
752 | if (err) |
753 | goto put_fail; | |
754 | ||
755 | err = -ECONNREFUSED; | |
421748ec | 756 | if (!S_ISSOCK(inode->i_mode)) |
1da177e4 | 757 | goto put_fail; |
6616f788 | 758 | u = unix_find_socket_byinode(inode); |
1da177e4 LT |
759 | if (!u) |
760 | goto put_fail; | |
761 | ||
762 | if (u->sk_type == type) | |
421748ec | 763 | touch_atime(path.mnt, path.dentry); |
1da177e4 | 764 | |
421748ec | 765 | path_put(&path); |
1da177e4 | 766 | |
e27dfcea | 767 | err = -EPROTOTYPE; |
1da177e4 LT |
768 | if (u->sk_type != type) { |
769 | sock_put(u); | |
770 | goto fail; | |
771 | } | |
772 | } else { | |
773 | err = -ECONNREFUSED; | |
e27dfcea | 774 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
775 | if (u) { |
776 | struct dentry *dentry; | |
777 | dentry = unix_sk(u)->dentry; | |
778 | if (dentry) | |
779 | touch_atime(unix_sk(u)->mnt, dentry); | |
780 | } else | |
781 | goto fail; | |
782 | } | |
783 | return u; | |
784 | ||
785 | put_fail: | |
421748ec | 786 | path_put(&path); |
1da177e4 | 787 | fail: |
e27dfcea | 788 | *error = err; |
1da177e4 LT |
789 | return NULL; |
790 | } | |
791 | ||
792 | ||
793 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
794 | { | |
795 | struct sock *sk = sock->sk; | |
3b1e0a65 | 796 | struct net *net = sock_net(sk); |
1da177e4 | 797 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 798 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
6eba6a37 | 799 | struct dentry *dentry = NULL; |
1da177e4 LT |
800 | struct nameidata nd; |
801 | int err; | |
802 | unsigned hash; | |
803 | struct unix_address *addr; | |
804 | struct hlist_head *list; | |
805 | ||
806 | err = -EINVAL; | |
807 | if (sunaddr->sun_family != AF_UNIX) | |
808 | goto out; | |
809 | ||
e27dfcea | 810 | if (addr_len == sizeof(short)) { |
1da177e4 LT |
811 | err = unix_autobind(sock); |
812 | goto out; | |
813 | } | |
814 | ||
815 | err = unix_mkname(sunaddr, addr_len, &hash); | |
816 | if (err < 0) | |
817 | goto out; | |
818 | addr_len = err; | |
819 | ||
57b47a53 | 820 | mutex_lock(&u->readlock); |
1da177e4 LT |
821 | |
822 | err = -EINVAL; | |
823 | if (u->addr) | |
824 | goto out_up; | |
825 | ||
826 | err = -ENOMEM; | |
827 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
828 | if (!addr) | |
829 | goto out_up; | |
830 | ||
831 | memcpy(addr->name, sunaddr, addr_len); | |
832 | addr->len = addr_len; | |
833 | addr->hash = hash ^ sk->sk_type; | |
834 | atomic_set(&addr->refcnt, 1); | |
835 | ||
836 | if (sunaddr->sun_path[0]) { | |
837 | unsigned int mode; | |
838 | err = 0; | |
839 | /* | |
840 | * Get the parent directory, calculate the hash for last | |
841 | * component. | |
842 | */ | |
843 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); | |
844 | if (err) | |
845 | goto out_mknod_parent; | |
f81a0bff CH |
846 | |
847 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
848 | err = PTR_ERR(dentry); |
849 | if (IS_ERR(dentry)) | |
850 | goto out_mknod_unlock; | |
f81a0bff | 851 | |
1da177e4 LT |
852 | /* |
853 | * All right, let's create it. | |
854 | */ | |
855 | mode = S_IFSOCK | | |
ce3b0f8d | 856 | (SOCK_INODE(sock)->i_mode & ~current_umask()); |
463c3197 DH |
857 | err = mnt_want_write(nd.path.mnt); |
858 | if (err) | |
859 | goto out_mknod_dput; | |
be6d3e56 KT |
860 | err = security_path_mknod(&nd.path, dentry, mode, 0); |
861 | if (err) | |
862 | goto out_mknod_drop_write; | |
4ac91378 | 863 | err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0); |
be6d3e56 | 864 | out_mknod_drop_write: |
463c3197 | 865 | mnt_drop_write(nd.path.mnt); |
1da177e4 LT |
866 | if (err) |
867 | goto out_mknod_dput; | |
4ac91378 JB |
868 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
869 | dput(nd.path.dentry); | |
870 | nd.path.dentry = dentry; | |
1da177e4 LT |
871 | |
872 | addr->hash = UNIX_HASH_SIZE; | |
873 | } | |
874 | ||
fbe9cc4a | 875 | spin_lock(&unix_table_lock); |
1da177e4 LT |
876 | |
877 | if (!sunaddr->sun_path[0]) { | |
878 | err = -EADDRINUSE; | |
097e66c5 | 879 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
880 | sk->sk_type, hash)) { |
881 | unix_release_addr(addr); | |
882 | goto out_unlock; | |
883 | } | |
884 | ||
885 | list = &unix_socket_table[addr->hash]; | |
886 | } else { | |
887 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; | |
4ac91378 JB |
888 | u->dentry = nd.path.dentry; |
889 | u->mnt = nd.path.mnt; | |
1da177e4 LT |
890 | } |
891 | ||
892 | err = 0; | |
893 | __unix_remove_socket(sk); | |
894 | u->addr = addr; | |
895 | __unix_insert_socket(list, sk); | |
896 | ||
897 | out_unlock: | |
fbe9cc4a | 898 | spin_unlock(&unix_table_lock); |
1da177e4 | 899 | out_up: |
57b47a53 | 900 | mutex_unlock(&u->readlock); |
1da177e4 LT |
901 | out: |
902 | return err; | |
903 | ||
904 | out_mknod_dput: | |
905 | dput(dentry); | |
906 | out_mknod_unlock: | |
4ac91378 | 907 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
1d957f9b | 908 | path_put(&nd.path); |
1da177e4 | 909 | out_mknod_parent: |
e27dfcea JK |
910 | if (err == -EEXIST) |
911 | err = -EADDRINUSE; | |
1da177e4 LT |
912 | unix_release_addr(addr); |
913 | goto out_up; | |
914 | } | |
915 | ||
278a3de5 DM |
916 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
917 | { | |
918 | if (unlikely(sk1 == sk2) || !sk2) { | |
919 | unix_state_lock(sk1); | |
920 | return; | |
921 | } | |
922 | if (sk1 < sk2) { | |
923 | unix_state_lock(sk1); | |
924 | unix_state_lock_nested(sk2); | |
925 | } else { | |
926 | unix_state_lock(sk2); | |
927 | unix_state_lock_nested(sk1); | |
928 | } | |
929 | } | |
930 | ||
931 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
932 | { | |
933 | if (unlikely(sk1 == sk2) || !sk2) { | |
934 | unix_state_unlock(sk1); | |
935 | return; | |
936 | } | |
937 | unix_state_unlock(sk1); | |
938 | unix_state_unlock(sk2); | |
939 | } | |
940 | ||
1da177e4 LT |
941 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
942 | int alen, int flags) | |
943 | { | |
944 | struct sock *sk = sock->sk; | |
3b1e0a65 | 945 | struct net *net = sock_net(sk); |
e27dfcea | 946 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
1da177e4 LT |
947 | struct sock *other; |
948 | unsigned hash; | |
949 | int err; | |
950 | ||
951 | if (addr->sa_family != AF_UNSPEC) { | |
952 | err = unix_mkname(sunaddr, alen, &hash); | |
953 | if (err < 0) | |
954 | goto out; | |
955 | alen = err; | |
956 | ||
957 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
958 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
959 | goto out; | |
960 | ||
278a3de5 | 961 | restart: |
e27dfcea | 962 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
963 | if (!other) |
964 | goto out; | |
965 | ||
278a3de5 DM |
966 | unix_state_double_lock(sk, other); |
967 | ||
968 | /* Apparently VFS overslept socket death. Retry. */ | |
969 | if (sock_flag(other, SOCK_DEAD)) { | |
970 | unix_state_double_unlock(sk, other); | |
971 | sock_put(other); | |
972 | goto restart; | |
973 | } | |
1da177e4 LT |
974 | |
975 | err = -EPERM; | |
976 | if (!unix_may_send(sk, other)) | |
977 | goto out_unlock; | |
978 | ||
979 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
980 | if (err) | |
981 | goto out_unlock; | |
982 | ||
983 | } else { | |
984 | /* | |
985 | * 1003.1g breaking connected state with AF_UNSPEC | |
986 | */ | |
987 | other = NULL; | |
278a3de5 | 988 | unix_state_double_lock(sk, other); |
1da177e4 LT |
989 | } |
990 | ||
991 | /* | |
992 | * If it was connected, reconnect. | |
993 | */ | |
994 | if (unix_peer(sk)) { | |
995 | struct sock *old_peer = unix_peer(sk); | |
e27dfcea | 996 | unix_peer(sk) = other; |
278a3de5 | 997 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
998 | |
999 | if (other != old_peer) | |
1000 | unix_dgram_disconnected(sk, old_peer); | |
1001 | sock_put(old_peer); | |
1002 | } else { | |
e27dfcea | 1003 | unix_peer(sk) = other; |
278a3de5 | 1004 | unix_state_double_unlock(sk, other); |
1da177e4 | 1005 | } |
ac7bfa62 | 1006 | return 0; |
1da177e4 LT |
1007 | |
1008 | out_unlock: | |
278a3de5 | 1009 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
1010 | sock_put(other); |
1011 | out: | |
1012 | return err; | |
1013 | } | |
1014 | ||
1015 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
1016 | { | |
1017 | struct unix_sock *u = unix_sk(other); | |
1018 | int sched; | |
1019 | DEFINE_WAIT(wait); | |
1020 | ||
1021 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
1022 | ||
1023 | sched = !sock_flag(other, SOCK_DEAD) && | |
1024 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
3c73419c | 1025 | unix_recvq_full(other); |
1da177e4 | 1026 | |
1c92b4e5 | 1027 | unix_state_unlock(other); |
1da177e4 LT |
1028 | |
1029 | if (sched) | |
1030 | timeo = schedule_timeout(timeo); | |
1031 | ||
1032 | finish_wait(&u->peer_wait, &wait); | |
1033 | return timeo; | |
1034 | } | |
1035 | ||
1036 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
1037 | int addr_len, int flags) | |
1038 | { | |
e27dfcea | 1039 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
1da177e4 | 1040 | struct sock *sk = sock->sk; |
3b1e0a65 | 1041 | struct net *net = sock_net(sk); |
1da177e4 LT |
1042 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1043 | struct sock *newsk = NULL; | |
1044 | struct sock *other = NULL; | |
1045 | struct sk_buff *skb = NULL; | |
1046 | unsigned hash; | |
1047 | int st; | |
1048 | int err; | |
1049 | long timeo; | |
1050 | ||
1051 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1052 | if (err < 0) | |
1053 | goto out; | |
1054 | addr_len = err; | |
1055 | ||
f64f9e71 JP |
1056 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr && |
1057 | (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1058 | goto out; |
1059 | ||
1060 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1061 | ||
1062 | /* First of all allocate resources. | |
1063 | If we will make it after state is locked, | |
1064 | we will have to recheck all again in any case. | |
1065 | */ | |
1066 | ||
1067 | err = -ENOMEM; | |
1068 | ||
1069 | /* create new sock for complete connection */ | |
3b1e0a65 | 1070 | newsk = unix_create1(sock_net(sk), NULL); |
1da177e4 LT |
1071 | if (newsk == NULL) |
1072 | goto out; | |
1073 | ||
1074 | /* Allocate skb for sending to listening sock */ | |
1075 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1076 | if (skb == NULL) | |
1077 | goto out; | |
1078 | ||
1079 | restart: | |
1080 | /* Find listening sock. */ | |
097e66c5 | 1081 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1082 | if (!other) |
1083 | goto out; | |
1084 | ||
1085 | /* Latch state of peer */ | |
1c92b4e5 | 1086 | unix_state_lock(other); |
1da177e4 LT |
1087 | |
1088 | /* Apparently VFS overslept socket death. Retry. */ | |
1089 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1090 | unix_state_unlock(other); |
1da177e4 LT |
1091 | sock_put(other); |
1092 | goto restart; | |
1093 | } | |
1094 | ||
1095 | err = -ECONNREFUSED; | |
1096 | if (other->sk_state != TCP_LISTEN) | |
1097 | goto out_unlock; | |
77238f2b TS |
1098 | if (other->sk_shutdown & RCV_SHUTDOWN) |
1099 | goto out_unlock; | |
1da177e4 | 1100 | |
3c73419c | 1101 | if (unix_recvq_full(other)) { |
1da177e4 LT |
1102 | err = -EAGAIN; |
1103 | if (!timeo) | |
1104 | goto out_unlock; | |
1105 | ||
1106 | timeo = unix_wait_for_peer(other, timeo); | |
1107 | ||
1108 | err = sock_intr_errno(timeo); | |
1109 | if (signal_pending(current)) | |
1110 | goto out; | |
1111 | sock_put(other); | |
1112 | goto restart; | |
ac7bfa62 | 1113 | } |
1da177e4 LT |
1114 | |
1115 | /* Latch our state. | |
1116 | ||
1117 | It is tricky place. We need to grab write lock and cannot | |
1118 | drop lock on peer. It is dangerous because deadlock is | |
1119 | possible. Connect to self case and simultaneous | |
1120 | attempt to connect are eliminated by checking socket | |
1121 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1122 | check this before attempt to grab lock. | |
1123 | ||
1124 | Well, and we have to recheck the state after socket locked. | |
1125 | */ | |
1126 | st = sk->sk_state; | |
1127 | ||
1128 | switch (st) { | |
1129 | case TCP_CLOSE: | |
1130 | /* This is ok... continue with connect */ | |
1131 | break; | |
1132 | case TCP_ESTABLISHED: | |
1133 | /* Socket is already connected */ | |
1134 | err = -EISCONN; | |
1135 | goto out_unlock; | |
1136 | default: | |
1137 | err = -EINVAL; | |
1138 | goto out_unlock; | |
1139 | } | |
1140 | ||
1c92b4e5 | 1141 | unix_state_lock_nested(sk); |
1da177e4 LT |
1142 | |
1143 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1144 | unix_state_unlock(sk); |
1145 | unix_state_unlock(other); | |
1da177e4 LT |
1146 | sock_put(other); |
1147 | goto restart; | |
1148 | } | |
1149 | ||
1150 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1151 | if (err) { | |
1c92b4e5 | 1152 | unix_state_unlock(sk); |
1da177e4 LT |
1153 | goto out_unlock; |
1154 | } | |
1155 | ||
1156 | /* The way is open! Fastly set all the necessary fields... */ | |
1157 | ||
1158 | sock_hold(sk); | |
1159 | unix_peer(newsk) = sk; | |
1160 | newsk->sk_state = TCP_ESTABLISHED; | |
1161 | newsk->sk_type = sk->sk_type; | |
109f6e39 | 1162 | init_peercred(newsk); |
1da177e4 | 1163 | newu = unix_sk(newsk); |
43815482 | 1164 | newsk->sk_wq = &newu->peer_wq; |
1da177e4 LT |
1165 | otheru = unix_sk(other); |
1166 | ||
1167 | /* copy address information from listening to new sock*/ | |
1168 | if (otheru->addr) { | |
1169 | atomic_inc(&otheru->addr->refcnt); | |
1170 | newu->addr = otheru->addr; | |
1171 | } | |
1172 | if (otheru->dentry) { | |
1173 | newu->dentry = dget(otheru->dentry); | |
1174 | newu->mnt = mntget(otheru->mnt); | |
1175 | } | |
1176 | ||
1177 | /* Set credentials */ | |
109f6e39 | 1178 | copy_peercred(sk, other); |
1da177e4 | 1179 | |
1da177e4 LT |
1180 | sock->state = SS_CONNECTED; |
1181 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1182 | sock_hold(newsk); |
1183 | ||
1184 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ | |
1185 | unix_peer(sk) = newsk; | |
1da177e4 | 1186 | |
1c92b4e5 | 1187 | unix_state_unlock(sk); |
1da177e4 LT |
1188 | |
1189 | /* take ten and and send info to listening sock */ | |
1190 | spin_lock(&other->sk_receive_queue.lock); | |
1191 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1192 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1193 | unix_state_unlock(other); |
1da177e4 LT |
1194 | other->sk_data_ready(other, 0); |
1195 | sock_put(other); | |
1196 | return 0; | |
1197 | ||
1198 | out_unlock: | |
1199 | if (other) | |
1c92b4e5 | 1200 | unix_state_unlock(other); |
1da177e4 LT |
1201 | |
1202 | out: | |
40d44446 | 1203 | kfree_skb(skb); |
1da177e4 LT |
1204 | if (newsk) |
1205 | unix_release_sock(newsk, 0); | |
1206 | if (other) | |
1207 | sock_put(other); | |
1208 | return err; | |
1209 | } | |
1210 | ||
1211 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1212 | { | |
e27dfcea | 1213 | struct sock *ska = socka->sk, *skb = sockb->sk; |
1da177e4 LT |
1214 | |
1215 | /* Join our sockets back to back */ | |
1216 | sock_hold(ska); | |
1217 | sock_hold(skb); | |
e27dfcea JK |
1218 | unix_peer(ska) = skb; |
1219 | unix_peer(skb) = ska; | |
109f6e39 EB |
1220 | init_peercred(ska); |
1221 | init_peercred(skb); | |
1da177e4 LT |
1222 | |
1223 | if (ska->sk_type != SOCK_DGRAM) { | |
1224 | ska->sk_state = TCP_ESTABLISHED; | |
1225 | skb->sk_state = TCP_ESTABLISHED; | |
1226 | socka->state = SS_CONNECTED; | |
1227 | sockb->state = SS_CONNECTED; | |
1228 | } | |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) | |
1233 | { | |
1234 | struct sock *sk = sock->sk; | |
1235 | struct sock *tsk; | |
1236 | struct sk_buff *skb; | |
1237 | int err; | |
1238 | ||
1239 | err = -EOPNOTSUPP; | |
6eba6a37 | 1240 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
1da177e4 LT |
1241 | goto out; |
1242 | ||
1243 | err = -EINVAL; | |
1244 | if (sk->sk_state != TCP_LISTEN) | |
1245 | goto out; | |
1246 | ||
1247 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1248 | * so that no locks are necessary. | |
1249 | */ | |
1250 | ||
1251 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1252 | if (!skb) { | |
1253 | /* This means receive shutdown. */ | |
1254 | if (err == 0) | |
1255 | err = -EINVAL; | |
1256 | goto out; | |
1257 | } | |
1258 | ||
1259 | tsk = skb->sk; | |
1260 | skb_free_datagram(sk, skb); | |
1261 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1262 | ||
1263 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1264 | unix_state_lock(tsk); |
1da177e4 LT |
1265 | newsock->state = SS_CONNECTED; |
1266 | sock_graft(tsk, newsock); | |
1c92b4e5 | 1267 | unix_state_unlock(tsk); |
1da177e4 LT |
1268 | return 0; |
1269 | ||
1270 | out: | |
1271 | return err; | |
1272 | } | |
1273 | ||
1274 | ||
1275 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1276 | { | |
1277 | struct sock *sk = sock->sk; | |
1278 | struct unix_sock *u; | |
13cfa97b | 1279 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, uaddr); |
1da177e4 LT |
1280 | int err = 0; |
1281 | ||
1282 | if (peer) { | |
1283 | sk = unix_peer_get(sk); | |
1284 | ||
1285 | err = -ENOTCONN; | |
1286 | if (!sk) | |
1287 | goto out; | |
1288 | err = 0; | |
1289 | } else { | |
1290 | sock_hold(sk); | |
1291 | } | |
1292 | ||
1293 | u = unix_sk(sk); | |
1c92b4e5 | 1294 | unix_state_lock(sk); |
1da177e4 LT |
1295 | if (!u->addr) { |
1296 | sunaddr->sun_family = AF_UNIX; | |
1297 | sunaddr->sun_path[0] = 0; | |
1298 | *uaddr_len = sizeof(short); | |
1299 | } else { | |
1300 | struct unix_address *addr = u->addr; | |
1301 | ||
1302 | *uaddr_len = addr->len; | |
1303 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1304 | } | |
1c92b4e5 | 1305 | unix_state_unlock(sk); |
1da177e4 LT |
1306 | sock_put(sk); |
1307 | out: | |
1308 | return err; | |
1309 | } | |
1310 | ||
1311 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1312 | { | |
1313 | int i; | |
1314 | ||
1315 | scm->fp = UNIXCB(skb).fp; | |
1da177e4 LT |
1316 | UNIXCB(skb).fp = NULL; |
1317 | ||
6eba6a37 | 1318 | for (i = scm->fp->count-1; i >= 0; i--) |
1da177e4 LT |
1319 | unix_notinflight(scm->fp->fp[i]); |
1320 | } | |
1321 | ||
7361c36c | 1322 | static void unix_destruct_scm(struct sk_buff *skb) |
1da177e4 LT |
1323 | { |
1324 | struct scm_cookie scm; | |
1325 | memset(&scm, 0, sizeof(scm)); | |
7361c36c EB |
1326 | scm.pid = UNIXCB(skb).pid; |
1327 | scm.cred = UNIXCB(skb).cred; | |
1328 | if (UNIXCB(skb).fp) | |
1329 | unix_detach_fds(&scm, skb); | |
1da177e4 LT |
1330 | |
1331 | /* Alas, it calls VFS */ | |
1332 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1333 | scm_destroy(&scm); | |
1334 | sock_wfree(skb); | |
1335 | } | |
1336 | ||
6209344f | 1337 | static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
1da177e4 LT |
1338 | { |
1339 | int i; | |
6209344f MS |
1340 | |
1341 | /* | |
1342 | * Need to duplicate file references for the sake of garbage | |
1343 | * collection. Otherwise a socket in the fps might become a | |
1344 | * candidate for GC while the skb is not yet queued. | |
1345 | */ | |
1346 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); | |
1347 | if (!UNIXCB(skb).fp) | |
1348 | return -ENOMEM; | |
1349 | ||
6eba6a37 | 1350 | for (i = scm->fp->count-1; i >= 0; i--) |
1da177e4 | 1351 | unix_inflight(scm->fp->fp[i]); |
6209344f | 1352 | return 0; |
1da177e4 LT |
1353 | } |
1354 | ||
7361c36c EB |
1355 | static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds) |
1356 | { | |
1357 | int err = 0; | |
1358 | UNIXCB(skb).pid = get_pid(scm->pid); | |
1359 | UNIXCB(skb).cred = get_cred(scm->cred); | |
1360 | UNIXCB(skb).fp = NULL; | |
1361 | if (scm->fp && send_fds) | |
1362 | err = unix_attach_fds(scm, skb); | |
1363 | ||
1364 | skb->destructor = unix_destruct_scm; | |
1365 | return err; | |
1366 | } | |
1367 | ||
1da177e4 LT |
1368 | /* |
1369 | * Send AF_UNIX data. | |
1370 | */ | |
1371 | ||
1372 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1373 | struct msghdr *msg, size_t len) | |
1374 | { | |
1375 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1376 | struct sock *sk = sock->sk; | |
3b1e0a65 | 1377 | struct net *net = sock_net(sk); |
1da177e4 | 1378 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 1379 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 LT |
1380 | struct sock *other = NULL; |
1381 | int namelen = 0; /* fake GCC */ | |
1382 | int err; | |
1383 | unsigned hash; | |
1384 | struct sk_buff *skb; | |
1385 | long timeo; | |
1386 | struct scm_cookie tmp_scm; | |
1387 | ||
1388 | if (NULL == siocb->scm) | |
1389 | siocb->scm = &tmp_scm; | |
5f23b734 | 1390 | wait_for_unix_gc(); |
1da177e4 LT |
1391 | err = scm_send(sock, msg, siocb->scm); |
1392 | if (err < 0) | |
1393 | return err; | |
1394 | ||
1395 | err = -EOPNOTSUPP; | |
1396 | if (msg->msg_flags&MSG_OOB) | |
1397 | goto out; | |
1398 | ||
1399 | if (msg->msg_namelen) { | |
1400 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1401 | if (err < 0) | |
1402 | goto out; | |
1403 | namelen = err; | |
1404 | } else { | |
1405 | sunaddr = NULL; | |
1406 | err = -ENOTCONN; | |
1407 | other = unix_peer_get(sk); | |
1408 | if (!other) | |
1409 | goto out; | |
1410 | } | |
1411 | ||
f64f9e71 JP |
1412 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr |
1413 | && (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1414 | goto out; |
1415 | ||
1416 | err = -EMSGSIZE; | |
1417 | if (len > sk->sk_sndbuf - 32) | |
1418 | goto out; | |
1419 | ||
1420 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); | |
e27dfcea | 1421 | if (skb == NULL) |
1da177e4 LT |
1422 | goto out; |
1423 | ||
7361c36c EB |
1424 | err = unix_scm_to_skb(siocb->scm, skb, true); |
1425 | if (err) | |
1426 | goto out_free; | |
dc49c1f9 | 1427 | unix_get_secdata(siocb->scm, skb); |
877ce7c1 | 1428 | |
badff6d0 | 1429 | skb_reset_transport_header(skb); |
6eba6a37 | 1430 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
1431 | if (err) |
1432 | goto out_free; | |
1433 | ||
1434 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1435 | ||
1436 | restart: | |
1437 | if (!other) { | |
1438 | err = -ECONNRESET; | |
1439 | if (sunaddr == NULL) | |
1440 | goto out_free; | |
1441 | ||
097e66c5 | 1442 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 | 1443 | hash, &err); |
e27dfcea | 1444 | if (other == NULL) |
1da177e4 LT |
1445 | goto out_free; |
1446 | } | |
1447 | ||
1c92b4e5 | 1448 | unix_state_lock(other); |
1da177e4 LT |
1449 | err = -EPERM; |
1450 | if (!unix_may_send(sk, other)) | |
1451 | goto out_unlock; | |
1452 | ||
1453 | if (sock_flag(other, SOCK_DEAD)) { | |
1454 | /* | |
1455 | * Check with 1003.1g - what should | |
1456 | * datagram error | |
1457 | */ | |
1c92b4e5 | 1458 | unix_state_unlock(other); |
1da177e4 LT |
1459 | sock_put(other); |
1460 | ||
1461 | err = 0; | |
1c92b4e5 | 1462 | unix_state_lock(sk); |
1da177e4 | 1463 | if (unix_peer(sk) == other) { |
e27dfcea | 1464 | unix_peer(sk) = NULL; |
1c92b4e5 | 1465 | unix_state_unlock(sk); |
1da177e4 LT |
1466 | |
1467 | unix_dgram_disconnected(sk, other); | |
1468 | sock_put(other); | |
1469 | err = -ECONNREFUSED; | |
1470 | } else { | |
1c92b4e5 | 1471 | unix_state_unlock(sk); |
1da177e4 LT |
1472 | } |
1473 | ||
1474 | other = NULL; | |
1475 | if (err) | |
1476 | goto out_free; | |
1477 | goto restart; | |
1478 | } | |
1479 | ||
1480 | err = -EPIPE; | |
1481 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1482 | goto out_unlock; | |
1483 | ||
1484 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1485 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1486 | if (err) | |
1487 | goto out_unlock; | |
1488 | } | |
1489 | ||
3c73419c | 1490 | if (unix_peer(other) != sk && unix_recvq_full(other)) { |
1da177e4 LT |
1491 | if (!timeo) { |
1492 | err = -EAGAIN; | |
1493 | goto out_unlock; | |
1494 | } | |
1495 | ||
1496 | timeo = unix_wait_for_peer(other, timeo); | |
1497 | ||
1498 | err = sock_intr_errno(timeo); | |
1499 | if (signal_pending(current)) | |
1500 | goto out_free; | |
1501 | ||
1502 | goto restart; | |
1503 | } | |
1504 | ||
1505 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1506 | unix_state_unlock(other); |
1da177e4 LT |
1507 | other->sk_data_ready(other, len); |
1508 | sock_put(other); | |
1509 | scm_destroy(siocb->scm); | |
1510 | return len; | |
1511 | ||
1512 | out_unlock: | |
1c92b4e5 | 1513 | unix_state_unlock(other); |
1da177e4 LT |
1514 | out_free: |
1515 | kfree_skb(skb); | |
1516 | out: | |
1517 | if (other) | |
1518 | sock_put(other); | |
1519 | scm_destroy(siocb->scm); | |
1520 | return err; | |
1521 | } | |
1522 | ||
ac7bfa62 | 1523 | |
1da177e4 LT |
1524 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
1525 | struct msghdr *msg, size_t len) | |
1526 | { | |
1527 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1528 | struct sock *sk = sock->sk; | |
1529 | struct sock *other = NULL; | |
e27dfcea | 1530 | struct sockaddr_un *sunaddr = msg->msg_name; |
6eba6a37 | 1531 | int err, size; |
1da177e4 | 1532 | struct sk_buff *skb; |
e27dfcea | 1533 | int sent = 0; |
1da177e4 | 1534 | struct scm_cookie tmp_scm; |
8ba69ba6 | 1535 | bool fds_sent = false; |
1da177e4 LT |
1536 | |
1537 | if (NULL == siocb->scm) | |
1538 | siocb->scm = &tmp_scm; | |
5f23b734 | 1539 | wait_for_unix_gc(); |
1da177e4 LT |
1540 | err = scm_send(sock, msg, siocb->scm); |
1541 | if (err < 0) | |
1542 | return err; | |
1543 | ||
1544 | err = -EOPNOTSUPP; | |
1545 | if (msg->msg_flags&MSG_OOB) | |
1546 | goto out_err; | |
1547 | ||
1548 | if (msg->msg_namelen) { | |
1549 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1550 | goto out_err; | |
1551 | } else { | |
1552 | sunaddr = NULL; | |
1553 | err = -ENOTCONN; | |
830a1e5c | 1554 | other = unix_peer(sk); |
1da177e4 LT |
1555 | if (!other) |
1556 | goto out_err; | |
1557 | } | |
1558 | ||
1559 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1560 | goto pipe_err; | |
1561 | ||
6eba6a37 | 1562 | while (sent < len) { |
1da177e4 | 1563 | /* |
e9df7d7f BL |
1564 | * Optimisation for the fact that under 0.01% of X |
1565 | * messages typically need breaking up. | |
1da177e4 LT |
1566 | */ |
1567 | ||
e9df7d7f | 1568 | size = len-sent; |
1da177e4 LT |
1569 | |
1570 | /* Keep two messages in the pipe so it schedules better */ | |
e9df7d7f BL |
1571 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
1572 | size = (sk->sk_sndbuf >> 1) - 64; | |
1da177e4 LT |
1573 | |
1574 | if (size > SKB_MAX_ALLOC) | |
1575 | size = SKB_MAX_ALLOC; | |
ac7bfa62 | 1576 | |
1da177e4 LT |
1577 | /* |
1578 | * Grab a buffer | |
1579 | */ | |
ac7bfa62 | 1580 | |
6eba6a37 ED |
1581 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, |
1582 | &err); | |
1da177e4 | 1583 | |
e27dfcea | 1584 | if (skb == NULL) |
1da177e4 LT |
1585 | goto out_err; |
1586 | ||
1587 | /* | |
1588 | * If you pass two values to the sock_alloc_send_skb | |
1589 | * it tries to grab the large buffer with GFP_NOFS | |
1590 | * (which can fail easily), and if it fails grab the | |
1591 | * fallback size buffer which is under a page and will | |
1592 | * succeed. [Alan] | |
1593 | */ | |
1594 | size = min_t(int, size, skb_tailroom(skb)); | |
1595 | ||
7361c36c | 1596 | |
8ba69ba6 | 1597 | /* Only send the fds in the first buffer */ |
7361c36c EB |
1598 | err = unix_scm_to_skb(siocb->scm, skb, !fds_sent); |
1599 | if (err) { | |
1600 | kfree_skb(skb); | |
1601 | goto out_err; | |
6209344f | 1602 | } |
7361c36c | 1603 | fds_sent = true; |
1da177e4 | 1604 | |
6eba6a37 ED |
1605 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
1606 | if (err) { | |
1da177e4 LT |
1607 | kfree_skb(skb); |
1608 | goto out_err; | |
1609 | } | |
1610 | ||
1c92b4e5 | 1611 | unix_state_lock(other); |
1da177e4 LT |
1612 | |
1613 | if (sock_flag(other, SOCK_DEAD) || | |
1614 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1615 | goto pipe_err_free; | |
1616 | ||
1617 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1c92b4e5 | 1618 | unix_state_unlock(other); |
1da177e4 | 1619 | other->sk_data_ready(other, size); |
e27dfcea | 1620 | sent += size; |
1da177e4 | 1621 | } |
1da177e4 LT |
1622 | |
1623 | scm_destroy(siocb->scm); | |
1624 | siocb->scm = NULL; | |
1625 | ||
1626 | return sent; | |
1627 | ||
1628 | pipe_err_free: | |
1c92b4e5 | 1629 | unix_state_unlock(other); |
1da177e4 LT |
1630 | kfree_skb(skb); |
1631 | pipe_err: | |
6eba6a37 ED |
1632 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
1633 | send_sig(SIGPIPE, current, 0); | |
1da177e4 LT |
1634 | err = -EPIPE; |
1635 | out_err: | |
1da177e4 LT |
1636 | scm_destroy(siocb->scm); |
1637 | siocb->scm = NULL; | |
1638 | return sent ? : err; | |
1639 | } | |
1640 | ||
1641 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1642 | struct msghdr *msg, size_t len) | |
1643 | { | |
1644 | int err; | |
1645 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1646 | |
1da177e4 LT |
1647 | err = sock_error(sk); |
1648 | if (err) | |
1649 | return err; | |
1650 | ||
1651 | if (sk->sk_state != TCP_ESTABLISHED) | |
1652 | return -ENOTCONN; | |
1653 | ||
1654 | if (msg->msg_namelen) | |
1655 | msg->msg_namelen = 0; | |
1656 | ||
1657 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
1658 | } | |
ac7bfa62 | 1659 | |
1da177e4 LT |
1660 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
1661 | { | |
1662 | struct unix_sock *u = unix_sk(sk); | |
1663 | ||
1664 | msg->msg_namelen = 0; | |
1665 | if (u->addr) { | |
1666 | msg->msg_namelen = u->addr->len; | |
1667 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1672 | struct msghdr *msg, size_t size, | |
1673 | int flags) | |
1674 | { | |
1675 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1676 | struct scm_cookie tmp_scm; | |
1677 | struct sock *sk = sock->sk; | |
1678 | struct unix_sock *u = unix_sk(sk); | |
1679 | int noblock = flags & MSG_DONTWAIT; | |
1680 | struct sk_buff *skb; | |
1681 | int err; | |
1682 | ||
1683 | err = -EOPNOTSUPP; | |
1684 | if (flags&MSG_OOB) | |
1685 | goto out; | |
1686 | ||
1687 | msg->msg_namelen = 0; | |
1688 | ||
57b47a53 | 1689 | mutex_lock(&u->readlock); |
1da177e4 LT |
1690 | |
1691 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
0a112258 FZ |
1692 | if (!skb) { |
1693 | unix_state_lock(sk); | |
1694 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
1695 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
1696 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1697 | err = 0; | |
1698 | unix_state_unlock(sk); | |
1da177e4 | 1699 | goto out_unlock; |
0a112258 | 1700 | } |
1da177e4 | 1701 | |
71e20f18 | 1702 | wake_up_interruptible_sync(&u->peer_wait); |
1da177e4 LT |
1703 | |
1704 | if (msg->msg_name) | |
1705 | unix_copy_addr(msg, skb->sk); | |
1706 | ||
1707 | if (size > skb->len) | |
1708 | size = skb->len; | |
1709 | else if (size < skb->len) | |
1710 | msg->msg_flags |= MSG_TRUNC; | |
1711 | ||
1712 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); | |
1713 | if (err) | |
1714 | goto out_free; | |
1715 | ||
1716 | if (!siocb->scm) { | |
1717 | siocb->scm = &tmp_scm; | |
1718 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1719 | } | |
7361c36c | 1720 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred); |
877ce7c1 | 1721 | unix_set_secdata(siocb->scm, skb); |
1da177e4 | 1722 | |
6eba6a37 | 1723 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
1724 | if (UNIXCB(skb).fp) |
1725 | unix_detach_fds(siocb->scm, skb); | |
6eba6a37 | 1726 | } else { |
1da177e4 LT |
1727 | /* It is questionable: on PEEK we could: |
1728 | - do not return fds - good, but too simple 8) | |
1729 | - return fds, and do not return them on read (old strategy, | |
1730 | apparently wrong) | |
1731 | - clone fds (I chose it for now, it is the most universal | |
1732 | solution) | |
ac7bfa62 YH |
1733 | |
1734 | POSIX 1003.1g does not actually define this clearly | |
1735 | at all. POSIX 1003.1g doesn't define a lot of things | |
1736 | clearly however! | |
1737 | ||
1da177e4 LT |
1738 | */ |
1739 | if (UNIXCB(skb).fp) | |
1740 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1741 | } | |
1742 | err = size; | |
1743 | ||
1744 | scm_recv(sock, msg, siocb->scm, flags); | |
1745 | ||
1746 | out_free: | |
6eba6a37 | 1747 | skb_free_datagram(sk, skb); |
1da177e4 | 1748 | out_unlock: |
57b47a53 | 1749 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1750 | out: |
1751 | return err; | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * Sleep until data has arrive. But check for races.. | |
1756 | */ | |
ac7bfa62 | 1757 | |
6eba6a37 | 1758 | static long unix_stream_data_wait(struct sock *sk, long timeo) |
1da177e4 LT |
1759 | { |
1760 | DEFINE_WAIT(wait); | |
1761 | ||
1c92b4e5 | 1762 | unix_state_lock(sk); |
1da177e4 LT |
1763 | |
1764 | for (;;) { | |
aa395145 | 1765 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 | 1766 | |
b03efcfb | 1767 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
1da177e4 LT |
1768 | sk->sk_err || |
1769 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1770 | signal_pending(current) || | |
1771 | !timeo) | |
1772 | break; | |
1773 | ||
1774 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 1775 | unix_state_unlock(sk); |
1da177e4 | 1776 | timeo = schedule_timeout(timeo); |
1c92b4e5 | 1777 | unix_state_lock(sk); |
1da177e4 LT |
1778 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1779 | } | |
1780 | ||
aa395145 | 1781 | finish_wait(sk_sleep(sk), &wait); |
1c92b4e5 | 1782 | unix_state_unlock(sk); |
1da177e4 LT |
1783 | return timeo; |
1784 | } | |
1785 | ||
1786 | ||
1787 | ||
1788 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1789 | struct msghdr *msg, size_t size, | |
1790 | int flags) | |
1791 | { | |
1792 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1793 | struct scm_cookie tmp_scm; | |
1794 | struct sock *sk = sock->sk; | |
1795 | struct unix_sock *u = unix_sk(sk); | |
e27dfcea | 1796 | struct sockaddr_un *sunaddr = msg->msg_name; |
1da177e4 LT |
1797 | int copied = 0; |
1798 | int check_creds = 0; | |
1799 | int target; | |
1800 | int err = 0; | |
1801 | long timeo; | |
1802 | ||
1803 | err = -EINVAL; | |
1804 | if (sk->sk_state != TCP_ESTABLISHED) | |
1805 | goto out; | |
1806 | ||
1807 | err = -EOPNOTSUPP; | |
1808 | if (flags&MSG_OOB) | |
1809 | goto out; | |
1810 | ||
1811 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
1812 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
1813 | ||
1814 | msg->msg_namelen = 0; | |
1815 | ||
1816 | /* Lock the socket to prevent queue disordering | |
1817 | * while sleeps in memcpy_tomsg | |
1818 | */ | |
1819 | ||
1820 | if (!siocb->scm) { | |
1821 | siocb->scm = &tmp_scm; | |
1822 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1823 | } | |
1824 | ||
57b47a53 | 1825 | mutex_lock(&u->readlock); |
1da177e4 | 1826 | |
6eba6a37 | 1827 | do { |
1da177e4 LT |
1828 | int chunk; |
1829 | struct sk_buff *skb; | |
1830 | ||
3c0d2f37 | 1831 | unix_state_lock(sk); |
1da177e4 | 1832 | skb = skb_dequeue(&sk->sk_receive_queue); |
6eba6a37 | 1833 | if (skb == NULL) { |
1da177e4 | 1834 | if (copied >= target) |
3c0d2f37 | 1835 | goto unlock; |
1da177e4 LT |
1836 | |
1837 | /* | |
1838 | * POSIX 1003.1g mandates this order. | |
1839 | */ | |
ac7bfa62 | 1840 | |
6eba6a37 ED |
1841 | err = sock_error(sk); |
1842 | if (err) | |
3c0d2f37 | 1843 | goto unlock; |
1da177e4 | 1844 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
1845 | goto unlock; |
1846 | ||
1847 | unix_state_unlock(sk); | |
1da177e4 LT |
1848 | err = -EAGAIN; |
1849 | if (!timeo) | |
1850 | break; | |
57b47a53 | 1851 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1852 | |
1853 | timeo = unix_stream_data_wait(sk, timeo); | |
1854 | ||
1855 | if (signal_pending(current)) { | |
1856 | err = sock_intr_errno(timeo); | |
1857 | goto out; | |
1858 | } | |
57b47a53 | 1859 | mutex_lock(&u->readlock); |
1da177e4 | 1860 | continue; |
3c0d2f37 MS |
1861 | unlock: |
1862 | unix_state_unlock(sk); | |
1863 | break; | |
1da177e4 | 1864 | } |
3c0d2f37 | 1865 | unix_state_unlock(sk); |
1da177e4 LT |
1866 | |
1867 | if (check_creds) { | |
1868 | /* Never glue messages from different writers */ | |
7361c36c EB |
1869 | if ((UNIXCB(skb).pid != siocb->scm->pid) || |
1870 | (UNIXCB(skb).cred != siocb->scm->cred)) { | |
1da177e4 LT |
1871 | skb_queue_head(&sk->sk_receive_queue, skb); |
1872 | break; | |
1873 | } | |
1874 | } else { | |
1875 | /* Copy credentials */ | |
7361c36c | 1876 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred); |
1da177e4 LT |
1877 | check_creds = 1; |
1878 | } | |
1879 | ||
1880 | /* Copy address just once */ | |
6eba6a37 | 1881 | if (sunaddr) { |
1da177e4 LT |
1882 | unix_copy_addr(msg, skb->sk); |
1883 | sunaddr = NULL; | |
1884 | } | |
1885 | ||
1886 | chunk = min_t(unsigned int, skb->len, size); | |
1887 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
1888 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1889 | if (copied == 0) | |
1890 | copied = -EFAULT; | |
1891 | break; | |
1892 | } | |
1893 | copied += chunk; | |
1894 | size -= chunk; | |
1895 | ||
1896 | /* Mark read part of skb as used */ | |
6eba6a37 | 1897 | if (!(flags & MSG_PEEK)) { |
1da177e4 LT |
1898 | skb_pull(skb, chunk); |
1899 | ||
1900 | if (UNIXCB(skb).fp) | |
1901 | unix_detach_fds(siocb->scm, skb); | |
1902 | ||
1903 | /* put the skb back if we didn't use it up.. */ | |
6eba6a37 | 1904 | if (skb->len) { |
1da177e4 LT |
1905 | skb_queue_head(&sk->sk_receive_queue, skb); |
1906 | break; | |
1907 | } | |
1908 | ||
70d4bf6d | 1909 | consume_skb(skb); |
1da177e4 LT |
1910 | |
1911 | if (siocb->scm->fp) | |
1912 | break; | |
6eba6a37 | 1913 | } else { |
1da177e4 LT |
1914 | /* It is questionable, see note in unix_dgram_recvmsg. |
1915 | */ | |
1916 | if (UNIXCB(skb).fp) | |
1917 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1918 | ||
1919 | /* put message back and return */ | |
1920 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1921 | break; | |
1922 | } | |
1923 | } while (size); | |
1924 | ||
57b47a53 | 1925 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1926 | scm_recv(sock, msg, siocb->scm, flags); |
1927 | out: | |
1928 | return copied ? : err; | |
1929 | } | |
1930 | ||
1931 | static int unix_shutdown(struct socket *sock, int mode) | |
1932 | { | |
1933 | struct sock *sk = sock->sk; | |
1934 | struct sock *other; | |
1935 | ||
1936 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); | |
1937 | ||
1938 | if (mode) { | |
1c92b4e5 | 1939 | unix_state_lock(sk); |
1da177e4 | 1940 | sk->sk_shutdown |= mode; |
e27dfcea | 1941 | other = unix_peer(sk); |
1da177e4 LT |
1942 | if (other) |
1943 | sock_hold(other); | |
1c92b4e5 | 1944 | unix_state_unlock(sk); |
1da177e4 LT |
1945 | sk->sk_state_change(sk); |
1946 | ||
1947 | if (other && | |
1948 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
1949 | ||
1950 | int peer_mode = 0; | |
1951 | ||
1952 | if (mode&RCV_SHUTDOWN) | |
1953 | peer_mode |= SEND_SHUTDOWN; | |
1954 | if (mode&SEND_SHUTDOWN) | |
1955 | peer_mode |= RCV_SHUTDOWN; | |
1c92b4e5 | 1956 | unix_state_lock(other); |
1da177e4 | 1957 | other->sk_shutdown |= peer_mode; |
1c92b4e5 | 1958 | unix_state_unlock(other); |
1da177e4 | 1959 | other->sk_state_change(other); |
1da177e4 | 1960 | if (peer_mode == SHUTDOWN_MASK) |
8d8ad9d7 | 1961 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 | 1962 | else if (peer_mode & RCV_SHUTDOWN) |
8d8ad9d7 | 1963 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1964 | } |
1965 | if (other) | |
1966 | sock_put(other); | |
1967 | } | |
1968 | return 0; | |
1969 | } | |
1970 | ||
1971 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1972 | { | |
1973 | struct sock *sk = sock->sk; | |
e27dfcea | 1974 | long amount = 0; |
1da177e4 LT |
1975 | int err; |
1976 | ||
6eba6a37 ED |
1977 | switch (cmd) { |
1978 | case SIOCOUTQ: | |
31e6d363 | 1979 | amount = sk_wmem_alloc_get(sk); |
6eba6a37 ED |
1980 | err = put_user(amount, (int __user *)arg); |
1981 | break; | |
1982 | case SIOCINQ: | |
1da177e4 LT |
1983 | { |
1984 | struct sk_buff *skb; | |
1985 | ||
1986 | if (sk->sk_state == TCP_LISTEN) { | |
1987 | err = -EINVAL; | |
1988 | break; | |
1989 | } | |
1990 | ||
1991 | spin_lock(&sk->sk_receive_queue.lock); | |
1992 | if (sk->sk_type == SOCK_STREAM || | |
1993 | sk->sk_type == SOCK_SEQPACKET) { | |
1994 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
1995 | amount += skb->len; | |
1996 | } else { | |
1997 | skb = skb_peek(&sk->sk_receive_queue); | |
1998 | if (skb) | |
e27dfcea | 1999 | amount = skb->len; |
1da177e4 LT |
2000 | } |
2001 | spin_unlock(&sk->sk_receive_queue.lock); | |
2002 | err = put_user(amount, (int __user *)arg); | |
2003 | break; | |
2004 | } | |
2005 | ||
6eba6a37 ED |
2006 | default: |
2007 | err = -ENOIOCTLCMD; | |
2008 | break; | |
1da177e4 LT |
2009 | } |
2010 | return err; | |
2011 | } | |
2012 | ||
6eba6a37 | 2013 | static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 LT |
2014 | { |
2015 | struct sock *sk = sock->sk; | |
2016 | unsigned int mask; | |
2017 | ||
aa395145 | 2018 | sock_poll_wait(file, sk_sleep(sk), wait); |
1da177e4 LT |
2019 | mask = 0; |
2020 | ||
2021 | /* exceptional events? */ | |
2022 | if (sk->sk_err) | |
2023 | mask |= POLLERR; | |
2024 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
2025 | mask |= POLLHUP; | |
f348d70a DL |
2026 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
2027 | mask |= POLLRDHUP; | |
1da177e4 LT |
2028 | |
2029 | /* readable? */ | |
2030 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
2031 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
2032 | mask |= POLLIN | POLLRDNORM; | |
2033 | ||
2034 | /* Connection-based need to check for termination and startup */ | |
6eba6a37 ED |
2035 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
2036 | sk->sk_state == TCP_CLOSE) | |
1da177e4 LT |
2037 | mask |= POLLHUP; |
2038 | ||
2039 | /* | |
2040 | * we set writable also when the other side has shut down the | |
2041 | * connection. This prevents stuck sockets. | |
2042 | */ | |
2043 | if (unix_writable(sk)) | |
2044 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
2045 | ||
2046 | return mask; | |
2047 | } | |
2048 | ||
ec0d215f RW |
2049 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
2050 | poll_table *wait) | |
3c73419c | 2051 | { |
ec0d215f RW |
2052 | struct sock *sk = sock->sk, *other; |
2053 | unsigned int mask, writable; | |
3c73419c | 2054 | |
aa395145 | 2055 | sock_poll_wait(file, sk_sleep(sk), wait); |
3c73419c RW |
2056 | mask = 0; |
2057 | ||
2058 | /* exceptional events? */ | |
2059 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
2060 | mask |= POLLERR; | |
2061 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2062 | mask |= POLLRDHUP; | |
2063 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
2064 | mask |= POLLHUP; | |
2065 | ||
2066 | /* readable? */ | |
2067 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
2068 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
2069 | mask |= POLLIN | POLLRDNORM; | |
2070 | ||
2071 | /* Connection-based need to check for termination and startup */ | |
2072 | if (sk->sk_type == SOCK_SEQPACKET) { | |
2073 | if (sk->sk_state == TCP_CLOSE) | |
2074 | mask |= POLLHUP; | |
2075 | /* connection hasn't started yet? */ | |
2076 | if (sk->sk_state == TCP_SYN_SENT) | |
2077 | return mask; | |
2078 | } | |
2079 | ||
2080 | /* writable? */ | |
ec0d215f RW |
2081 | writable = unix_writable(sk); |
2082 | if (writable) { | |
2083 | other = unix_peer_get(sk); | |
2084 | if (other) { | |
2085 | if (unix_peer(other) != sk) { | |
a57de0b4 | 2086 | sock_poll_wait(file, &unix_sk(other)->peer_wait, |
ec0d215f RW |
2087 | wait); |
2088 | if (unix_recvq_full(other)) | |
2089 | writable = 0; | |
2090 | } | |
2091 | ||
2092 | sock_put(other); | |
2093 | } | |
2094 | } | |
2095 | ||
2096 | if (writable) | |
3c73419c RW |
2097 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
2098 | else | |
2099 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
2100 | ||
3c73419c RW |
2101 | return mask; |
2102 | } | |
1da177e4 LT |
2103 | |
2104 | #ifdef CONFIG_PROC_FS | |
a53eb3fe PE |
2105 | static struct sock *first_unix_socket(int *i) |
2106 | { | |
2107 | for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2108 | if (!hlist_empty(&unix_socket_table[*i])) | |
2109 | return __sk_head(&unix_socket_table[*i]); | |
2110 | } | |
2111 | return NULL; | |
2112 | } | |
2113 | ||
2114 | static struct sock *next_unix_socket(int *i, struct sock *s) | |
2115 | { | |
2116 | struct sock *next = sk_next(s); | |
2117 | /* More in this chain? */ | |
2118 | if (next) | |
2119 | return next; | |
2120 | /* Look for next non-empty chain. */ | |
2121 | for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { | |
2122 | if (!hlist_empty(&unix_socket_table[*i])) | |
2123 | return __sk_head(&unix_socket_table[*i]); | |
2124 | } | |
2125 | return NULL; | |
2126 | } | |
2127 | ||
097e66c5 | 2128 | struct unix_iter_state { |
e372c414 | 2129 | struct seq_net_private p; |
097e66c5 DL |
2130 | int i; |
2131 | }; | |
e27dfcea | 2132 | |
1218854a | 2133 | static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos) |
1da177e4 | 2134 | { |
1218854a | 2135 | struct unix_iter_state *iter = seq->private; |
1da177e4 LT |
2136 | loff_t off = 0; |
2137 | struct sock *s; | |
2138 | ||
097e66c5 | 2139 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
1218854a | 2140 | if (sock_net(s) != seq_file_net(seq)) |
097e66c5 | 2141 | continue; |
ac7bfa62 | 2142 | if (off == pos) |
1da177e4 LT |
2143 | return s; |
2144 | ++off; | |
2145 | } | |
2146 | return NULL; | |
2147 | } | |
2148 | ||
1da177e4 | 2149 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2150 | __acquires(unix_table_lock) |
1da177e4 | 2151 | { |
fbe9cc4a | 2152 | spin_lock(&unix_table_lock); |
b9f3124f | 2153 | return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
1da177e4 LT |
2154 | } |
2155 | ||
2156 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2157 | { | |
097e66c5 DL |
2158 | struct unix_iter_state *iter = seq->private; |
2159 | struct sock *sk = v; | |
1da177e4 LT |
2160 | ++*pos; |
2161 | ||
b9f3124f | 2162 | if (v == SEQ_START_TOKEN) |
097e66c5 DL |
2163 | sk = first_unix_socket(&iter->i); |
2164 | else | |
2165 | sk = next_unix_socket(&iter->i, sk); | |
1218854a | 2166 | while (sk && (sock_net(sk) != seq_file_net(seq))) |
097e66c5 DL |
2167 | sk = next_unix_socket(&iter->i, sk); |
2168 | return sk; | |
1da177e4 LT |
2169 | } |
2170 | ||
2171 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2172 | __releases(unix_table_lock) |
1da177e4 | 2173 | { |
fbe9cc4a | 2174 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2175 | } |
2176 | ||
2177 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2178 | { | |
ac7bfa62 | 2179 | |
b9f3124f | 2180 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2181 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2182 | "Inode Path\n"); | |
2183 | else { | |
2184 | struct sock *s = v; | |
2185 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2186 | unix_state_lock(s); |
1da177e4 LT |
2187 | |
2188 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", | |
2189 | s, | |
2190 | atomic_read(&s->sk_refcnt), | |
2191 | 0, | |
2192 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2193 | s->sk_type, | |
2194 | s->sk_socket ? | |
2195 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2196 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2197 | sock_i_ino(s)); | |
2198 | ||
2199 | if (u->addr) { | |
2200 | int i, len; | |
2201 | seq_putc(seq, ' '); | |
2202 | ||
2203 | i = 0; | |
2204 | len = u->addr->len - sizeof(short); | |
2205 | if (!UNIX_ABSTRACT(s)) | |
2206 | len--; | |
2207 | else { | |
2208 | seq_putc(seq, '@'); | |
2209 | i++; | |
2210 | } | |
2211 | for ( ; i < len; i++) | |
2212 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2213 | } | |
1c92b4e5 | 2214 | unix_state_unlock(s); |
1da177e4 LT |
2215 | seq_putc(seq, '\n'); |
2216 | } | |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
56b3d975 | 2221 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2222 | .start = unix_seq_start, |
2223 | .next = unix_seq_next, | |
2224 | .stop = unix_seq_stop, | |
2225 | .show = unix_seq_show, | |
2226 | }; | |
2227 | ||
1da177e4 LT |
2228 | static int unix_seq_open(struct inode *inode, struct file *file) |
2229 | { | |
e372c414 DL |
2230 | return seq_open_net(inode, file, &unix_seq_ops, |
2231 | sizeof(struct unix_iter_state)); | |
1da177e4 LT |
2232 | } |
2233 | ||
da7071d7 | 2234 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2235 | .owner = THIS_MODULE, |
2236 | .open = unix_seq_open, | |
2237 | .read = seq_read, | |
2238 | .llseek = seq_lseek, | |
e372c414 | 2239 | .release = seq_release_net, |
1da177e4 LT |
2240 | }; |
2241 | ||
2242 | #endif | |
2243 | ||
ec1b4cf7 | 2244 | static const struct net_proto_family unix_family_ops = { |
1da177e4 LT |
2245 | .family = PF_UNIX, |
2246 | .create = unix_create, | |
2247 | .owner = THIS_MODULE, | |
2248 | }; | |
2249 | ||
097e66c5 | 2250 | |
2c8c1e72 | 2251 | static int __net_init unix_net_init(struct net *net) |
097e66c5 DL |
2252 | { |
2253 | int error = -ENOMEM; | |
2254 | ||
a0a53c8b | 2255 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2256 | if (unix_sysctl_register(net)) |
2257 | goto out; | |
d392e497 | 2258 | |
097e66c5 | 2259 | #ifdef CONFIG_PROC_FS |
1597fbc0 PE |
2260 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) { |
2261 | unix_sysctl_unregister(net); | |
097e66c5 | 2262 | goto out; |
1597fbc0 | 2263 | } |
097e66c5 DL |
2264 | #endif |
2265 | error = 0; | |
2266 | out: | |
48dcc33e | 2267 | return error; |
097e66c5 DL |
2268 | } |
2269 | ||
2c8c1e72 | 2270 | static void __net_exit unix_net_exit(struct net *net) |
097e66c5 | 2271 | { |
1597fbc0 | 2272 | unix_sysctl_unregister(net); |
097e66c5 DL |
2273 | proc_net_remove(net, "unix"); |
2274 | } | |
2275 | ||
2276 | static struct pernet_operations unix_net_ops = { | |
2277 | .init = unix_net_init, | |
2278 | .exit = unix_net_exit, | |
2279 | }; | |
2280 | ||
1da177e4 LT |
2281 | static int __init af_unix_init(void) |
2282 | { | |
2283 | int rc = -1; | |
2284 | struct sk_buff *dummy_skb; | |
2285 | ||
ef047f5e | 2286 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
1da177e4 LT |
2287 | |
2288 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 YH |
2289 | if (rc != 0) { |
2290 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
0dc47877 | 2291 | __func__); |
1da177e4 LT |
2292 | goto out; |
2293 | } | |
2294 | ||
2295 | sock_register(&unix_family_ops); | |
097e66c5 | 2296 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2297 | out: |
2298 | return rc; | |
2299 | } | |
2300 | ||
2301 | static void __exit af_unix_exit(void) | |
2302 | { | |
2303 | sock_unregister(PF_UNIX); | |
1da177e4 | 2304 | proto_unregister(&unix_proto); |
097e66c5 | 2305 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2306 | } |
2307 | ||
3d366960 DW |
2308 | /* Earlier than device_initcall() so that other drivers invoking |
2309 | request_module() don't end up in a loop when modprobe tries | |
2310 | to use a UNIX socket. But later than subsys_initcall() because | |
2311 | we depend on stuff initialised there */ | |
2312 | fs_initcall(af_unix_init); | |
1da177e4 LT |
2313 | module_exit(af_unix_exit); |
2314 | ||
2315 | MODULE_LICENSE("GPL"); | |
2316 | MODULE_ALIAS_NETPROTO(PF_UNIX); |