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1da177e4 LT |
1 | /* |
2 | * NET4: Implementation of BSD Unix domain sockets. | |
3 | * | |
4 | * Authors: Alan Cox, <alan.cox@linux.org> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * Version: $Id: af_unix.c,v 1.133 2002/02/08 03:57:19 davem Exp $ | |
12 | * | |
13 | * Fixes: | |
14 | * Linus Torvalds : Assorted bug cures. | |
15 | * Niibe Yutaka : async I/O support. | |
16 | * Carsten Paeth : PF_UNIX check, address fixes. | |
17 | * Alan Cox : Limit size of allocated blocks. | |
18 | * Alan Cox : Fixed the stupid socketpair bug. | |
19 | * Alan Cox : BSD compatibility fine tuning. | |
20 | * Alan Cox : Fixed a bug in connect when interrupted. | |
21 | * Alan Cox : Sorted out a proper draft version of | |
22 | * file descriptor passing hacked up from | |
23 | * Mike Shaver's work. | |
24 | * Marty Leisner : Fixes to fd passing | |
25 | * Nick Nevin : recvmsg bugfix. | |
26 | * Alan Cox : Started proper garbage collector | |
27 | * Heiko EiBfeldt : Missing verify_area check | |
28 | * Alan Cox : Started POSIXisms | |
29 | * Andreas Schwab : Replace inode by dentry for proper | |
30 | * reference counting | |
31 | * Kirk Petersen : Made this a module | |
32 | * Christoph Rohland : Elegant non-blocking accept/connect algorithm. | |
33 | * Lots of bug fixes. | |
34 | * Alexey Kuznetosv : Repaired (I hope) bugs introduces | |
35 | * by above two patches. | |
36 | * Andrea Arcangeli : If possible we block in connect(2) | |
37 | * if the max backlog of the listen socket | |
38 | * is been reached. This won't break | |
39 | * old apps and it will avoid huge amount | |
40 | * of socks hashed (this for unix_gc() | |
41 | * performances reasons). | |
42 | * Security fix that limits the max | |
43 | * number of socks to 2*max_files and | |
44 | * the number of skb queueable in the | |
45 | * dgram receiver. | |
46 | * Artur Skawina : Hash function optimizations | |
47 | * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8) | |
48 | * Malcolm Beattie : Set peercred for socketpair | |
49 | * Michal Ostrowski : Module initialization cleanup. | |
50 | * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT, | |
51 | * the core infrastructure is doing that | |
52 | * for all net proto families now (2.5.69+) | |
53 | * | |
54 | * | |
55 | * Known differences from reference BSD that was tested: | |
56 | * | |
57 | * [TO FIX] | |
58 | * ECONNREFUSED is not returned from one end of a connected() socket to the | |
59 | * other the moment one end closes. | |
60 | * fstat() doesn't return st_dev=0, and give the blksize as high water mark | |
61 | * and a fake inode identifier (nor the BSD first socket fstat twice bug). | |
62 | * [NOT TO FIX] | |
63 | * accept() returns a path name even if the connecting socket has closed | |
64 | * in the meantime (BSD loses the path and gives up). | |
65 | * accept() returns 0 length path for an unbound connector. BSD returns 16 | |
66 | * and a null first byte in the path (but not for gethost/peername - BSD bug ??) | |
67 | * socketpair(...SOCK_RAW..) doesn't panic the kernel. | |
68 | * BSD af_unix apparently has connect forgetting to block properly. | |
69 | * (need to check this with the POSIX spec in detail) | |
70 | * | |
71 | * Differences from 2.0.0-11-... (ANK) | |
72 | * Bug fixes and improvements. | |
73 | * - client shutdown killed server socket. | |
74 | * - removed all useless cli/sti pairs. | |
75 | * | |
76 | * Semantic changes/extensions. | |
77 | * - generic control message passing. | |
78 | * - SCM_CREDENTIALS control message. | |
79 | * - "Abstract" (not FS based) socket bindings. | |
80 | * Abstract names are sequences of bytes (not zero terminated) | |
81 | * started by 0, so that this name space does not intersect | |
82 | * with BSD names. | |
83 | */ | |
84 | ||
85 | #include <linux/module.h> | |
86 | #include <linux/config.h> | |
87 | #include <linux/kernel.h> | |
1da177e4 LT |
88 | #include <linux/signal.h> |
89 | #include <linux/sched.h> | |
90 | #include <linux/errno.h> | |
91 | #include <linux/string.h> | |
92 | #include <linux/stat.h> | |
93 | #include <linux/dcache.h> | |
94 | #include <linux/namei.h> | |
95 | #include <linux/socket.h> | |
96 | #include <linux/un.h> | |
97 | #include <linux/fcntl.h> | |
98 | #include <linux/termios.h> | |
99 | #include <linux/sockios.h> | |
100 | #include <linux/net.h> | |
101 | #include <linux/in.h> | |
102 | #include <linux/fs.h> | |
103 | #include <linux/slab.h> | |
104 | #include <asm/uaccess.h> | |
105 | #include <linux/skbuff.h> | |
106 | #include <linux/netdevice.h> | |
107 | #include <net/sock.h> | |
108 | #include <linux/tcp.h> | |
109 | #include <net/af_unix.h> | |
110 | #include <linux/proc_fs.h> | |
111 | #include <linux/seq_file.h> | |
112 | #include <net/scm.h> | |
113 | #include <linux/init.h> | |
114 | #include <linux/poll.h> | |
115 | #include <linux/smp_lock.h> | |
116 | #include <linux/rtnetlink.h> | |
117 | #include <linux/mount.h> | |
118 | #include <net/checksum.h> | |
119 | #include <linux/security.h> | |
120 | ||
121 | int sysctl_unix_max_dgram_qlen = 10; | |
122 | ||
123 | struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; | |
124 | DEFINE_RWLOCK(unix_table_lock); | |
125 | static atomic_t unix_nr_socks = ATOMIC_INIT(0); | |
126 | ||
127 | #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) | |
128 | ||
129 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE) | |
130 | ||
131 | /* | |
132 | * SMP locking strategy: | |
133 | * hash table is protected with rwlock unix_table_lock | |
134 | * each socket state is protected by separate rwlock. | |
135 | */ | |
136 | ||
137 | static inline unsigned unix_hash_fold(unsigned hash) | |
138 | { | |
139 | hash ^= hash>>16; | |
140 | hash ^= hash>>8; | |
141 | return hash&(UNIX_HASH_SIZE-1); | |
142 | } | |
143 | ||
144 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
145 | ||
146 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
147 | { | |
148 | return unix_peer(osk) == sk; | |
149 | } | |
150 | ||
151 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
152 | { | |
153 | return (unix_peer(osk) == NULL || unix_our_peer(sk, osk)); | |
154 | } | |
155 | ||
156 | static struct sock *unix_peer_get(struct sock *s) | |
157 | { | |
158 | struct sock *peer; | |
159 | ||
160 | unix_state_rlock(s); | |
161 | peer = unix_peer(s); | |
162 | if (peer) | |
163 | sock_hold(peer); | |
164 | unix_state_runlock(s); | |
165 | return peer; | |
166 | } | |
167 | ||
168 | static inline void unix_release_addr(struct unix_address *addr) | |
169 | { | |
170 | if (atomic_dec_and_test(&addr->refcnt)) | |
171 | kfree(addr); | |
172 | } | |
173 | ||
174 | /* | |
175 | * Check unix socket name: | |
176 | * - should be not zero length. | |
177 | * - if started by not zero, should be NULL terminated (FS object) | |
178 | * - if started by zero, it is abstract name. | |
179 | */ | |
180 | ||
181 | static int unix_mkname(struct sockaddr_un * sunaddr, int len, unsigned *hashp) | |
182 | { | |
183 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
184 | return -EINVAL; | |
185 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
186 | return -EINVAL; | |
187 | if (sunaddr->sun_path[0]) { | |
188 | /* | |
189 | * This may look like an off by one error but it is a bit more | |
190 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
191 | * sun_path[108] doesnt as such exist. However in kernel space | |
192 | * we are guaranteed that it is a valid memory location in our | |
193 | * kernel address buffer. | |
194 | */ | |
195 | ((char *)sunaddr)[len]=0; | |
196 | len = strlen(sunaddr->sun_path)+1+sizeof(short); | |
197 | return len; | |
198 | } | |
199 | ||
200 | *hashp = unix_hash_fold(csum_partial((char*)sunaddr, len, 0)); | |
201 | return len; | |
202 | } | |
203 | ||
204 | static void __unix_remove_socket(struct sock *sk) | |
205 | { | |
206 | sk_del_node_init(sk); | |
207 | } | |
208 | ||
209 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
210 | { | |
211 | BUG_TRAP(sk_unhashed(sk)); | |
212 | sk_add_node(sk, list); | |
213 | } | |
214 | ||
215 | static inline void unix_remove_socket(struct sock *sk) | |
216 | { | |
217 | write_lock(&unix_table_lock); | |
218 | __unix_remove_socket(sk); | |
219 | write_unlock(&unix_table_lock); | |
220 | } | |
221 | ||
222 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
223 | { | |
224 | write_lock(&unix_table_lock); | |
225 | __unix_insert_socket(list, sk); | |
226 | write_unlock(&unix_table_lock); | |
227 | } | |
228 | ||
229 | static struct sock *__unix_find_socket_byname(struct sockaddr_un *sunname, | |
230 | int len, int type, unsigned hash) | |
231 | { | |
232 | struct sock *s; | |
233 | struct hlist_node *node; | |
234 | ||
235 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { | |
236 | struct unix_sock *u = unix_sk(s); | |
237 | ||
238 | if (u->addr->len == len && | |
239 | !memcmp(u->addr->name, sunname, len)) | |
240 | goto found; | |
241 | } | |
242 | s = NULL; | |
243 | found: | |
244 | return s; | |
245 | } | |
246 | ||
247 | static inline struct sock *unix_find_socket_byname(struct sockaddr_un *sunname, | |
248 | int len, int type, | |
249 | unsigned hash) | |
250 | { | |
251 | struct sock *s; | |
252 | ||
253 | read_lock(&unix_table_lock); | |
254 | s = __unix_find_socket_byname(sunname, len, type, hash); | |
255 | if (s) | |
256 | sock_hold(s); | |
257 | read_unlock(&unix_table_lock); | |
258 | return s; | |
259 | } | |
260 | ||
261 | static struct sock *unix_find_socket_byinode(struct inode *i) | |
262 | { | |
263 | struct sock *s; | |
264 | struct hlist_node *node; | |
265 | ||
266 | read_lock(&unix_table_lock); | |
267 | sk_for_each(s, node, | |
268 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { | |
269 | struct dentry *dentry = unix_sk(s)->dentry; | |
270 | ||
271 | if(dentry && dentry->d_inode == i) | |
272 | { | |
273 | sock_hold(s); | |
274 | goto found; | |
275 | } | |
276 | } | |
277 | s = NULL; | |
278 | found: | |
279 | read_unlock(&unix_table_lock); | |
280 | return s; | |
281 | } | |
282 | ||
283 | static inline int unix_writable(struct sock *sk) | |
284 | { | |
285 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
286 | } | |
287 | ||
288 | static void unix_write_space(struct sock *sk) | |
289 | { | |
290 | read_lock(&sk->sk_callback_lock); | |
291 | if (unix_writable(sk)) { | |
292 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
293 | wake_up_interruptible(sk->sk_sleep); | |
294 | sk_wake_async(sk, 2, POLL_OUT); | |
295 | } | |
296 | read_unlock(&sk->sk_callback_lock); | |
297 | } | |
298 | ||
299 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
300 | * queue of packets arrived from previous peer. First, it allows to do | |
301 | * flow control based only on wmem_alloc; second, sk connected to peer | |
302 | * may receive messages only from that peer. */ | |
303 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
304 | { | |
305 | if (skb_queue_len(&sk->sk_receive_queue)) { | |
306 | skb_queue_purge(&sk->sk_receive_queue); | |
307 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
308 | ||
309 | /* If one link of bidirectional dgram pipe is disconnected, | |
310 | * we signal error. Messages are lost. Do not make this, | |
311 | * when peer was not connected to us. | |
312 | */ | |
313 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
314 | other->sk_err = ECONNRESET; | |
315 | other->sk_error_report(other); | |
316 | } | |
317 | } | |
318 | } | |
319 | ||
320 | static void unix_sock_destructor(struct sock *sk) | |
321 | { | |
322 | struct unix_sock *u = unix_sk(sk); | |
323 | ||
324 | skb_queue_purge(&sk->sk_receive_queue); | |
325 | ||
326 | BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); | |
327 | BUG_TRAP(sk_unhashed(sk)); | |
328 | BUG_TRAP(!sk->sk_socket); | |
329 | if (!sock_flag(sk, SOCK_DEAD)) { | |
330 | printk("Attempt to release alive unix socket: %p\n", sk); | |
331 | return; | |
332 | } | |
333 | ||
334 | if (u->addr) | |
335 | unix_release_addr(u->addr); | |
336 | ||
337 | atomic_dec(&unix_nr_socks); | |
338 | #ifdef UNIX_REFCNT_DEBUG | |
339 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, atomic_read(&unix_nr_socks)); | |
340 | #endif | |
341 | } | |
342 | ||
343 | static int unix_release_sock (struct sock *sk, int embrion) | |
344 | { | |
345 | struct unix_sock *u = unix_sk(sk); | |
346 | struct dentry *dentry; | |
347 | struct vfsmount *mnt; | |
348 | struct sock *skpair; | |
349 | struct sk_buff *skb; | |
350 | int state; | |
351 | ||
352 | unix_remove_socket(sk); | |
353 | ||
354 | /* Clear state */ | |
355 | unix_state_wlock(sk); | |
356 | sock_orphan(sk); | |
357 | sk->sk_shutdown = SHUTDOWN_MASK; | |
358 | dentry = u->dentry; | |
359 | u->dentry = NULL; | |
360 | mnt = u->mnt; | |
361 | u->mnt = NULL; | |
362 | state = sk->sk_state; | |
363 | sk->sk_state = TCP_CLOSE; | |
364 | unix_state_wunlock(sk); | |
365 | ||
366 | wake_up_interruptible_all(&u->peer_wait); | |
367 | ||
368 | skpair=unix_peer(sk); | |
369 | ||
370 | if (skpair!=NULL) { | |
371 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { | |
372 | unix_state_wlock(skpair); | |
373 | /* No more writes */ | |
374 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
375 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
376 | skpair->sk_err = ECONNRESET; | |
377 | unix_state_wunlock(skpair); | |
378 | skpair->sk_state_change(skpair); | |
379 | read_lock(&skpair->sk_callback_lock); | |
380 | sk_wake_async(skpair,1,POLL_HUP); | |
381 | read_unlock(&skpair->sk_callback_lock); | |
382 | } | |
383 | sock_put(skpair); /* It may now die */ | |
384 | unix_peer(sk) = NULL; | |
385 | } | |
386 | ||
387 | /* Try to flush out this socket. Throw out buffers at least */ | |
388 | ||
389 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
390 | if (state==TCP_LISTEN) | |
391 | unix_release_sock(skb->sk, 1); | |
392 | /* passed fds are erased in the kfree_skb hook */ | |
393 | kfree_skb(skb); | |
394 | } | |
395 | ||
396 | if (dentry) { | |
397 | dput(dentry); | |
398 | mntput(mnt); | |
399 | } | |
400 | ||
401 | sock_put(sk); | |
402 | ||
403 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
404 | ||
405 | /* | |
406 | * Fixme: BSD difference: In BSD all sockets connected to use get | |
407 | * ECONNRESET and we die on the spot. In Linux we behave | |
408 | * like files and pipes do and wait for the last | |
409 | * dereference. | |
410 | * | |
411 | * Can't we simply set sock->err? | |
412 | * | |
413 | * What the above comment does talk about? --ANK(980817) | |
414 | */ | |
415 | ||
416 | if (atomic_read(&unix_tot_inflight)) | |
417 | unix_gc(); /* Garbage collect fds */ | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | static int unix_listen(struct socket *sock, int backlog) | |
423 | { | |
424 | int err; | |
425 | struct sock *sk = sock->sk; | |
426 | struct unix_sock *u = unix_sk(sk); | |
427 | ||
428 | err = -EOPNOTSUPP; | |
429 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
430 | goto out; /* Only stream/seqpacket sockets accept */ | |
431 | err = -EINVAL; | |
432 | if (!u->addr) | |
433 | goto out; /* No listens on an unbound socket */ | |
434 | unix_state_wlock(sk); | |
435 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) | |
436 | goto out_unlock; | |
437 | if (backlog > sk->sk_max_ack_backlog) | |
438 | wake_up_interruptible_all(&u->peer_wait); | |
439 | sk->sk_max_ack_backlog = backlog; | |
440 | sk->sk_state = TCP_LISTEN; | |
441 | /* set credentials so connect can copy them */ | |
442 | sk->sk_peercred.pid = current->tgid; | |
443 | sk->sk_peercred.uid = current->euid; | |
444 | sk->sk_peercred.gid = current->egid; | |
445 | err = 0; | |
446 | ||
447 | out_unlock: | |
448 | unix_state_wunlock(sk); | |
449 | out: | |
450 | return err; | |
451 | } | |
452 | ||
453 | static int unix_release(struct socket *); | |
454 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
455 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
456 | int addr_len, int flags); | |
457 | static int unix_socketpair(struct socket *, struct socket *); | |
458 | static int unix_accept(struct socket *, struct socket *, int); | |
459 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
460 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
461 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); | |
462 | static int unix_shutdown(struct socket *, int); | |
463 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, | |
464 | struct msghdr *, size_t); | |
465 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, | |
466 | struct msghdr *, size_t, int); | |
467 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, | |
468 | struct msghdr *, size_t); | |
469 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, | |
470 | struct msghdr *, size_t, int); | |
471 | static int unix_dgram_connect(struct socket *, struct sockaddr *, | |
472 | int, int); | |
473 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, | |
474 | struct msghdr *, size_t); | |
475 | ||
476 | static struct proto_ops unix_stream_ops = { | |
477 | .family = PF_UNIX, | |
478 | .owner = THIS_MODULE, | |
479 | .release = unix_release, | |
480 | .bind = unix_bind, | |
481 | .connect = unix_stream_connect, | |
482 | .socketpair = unix_socketpair, | |
483 | .accept = unix_accept, | |
484 | .getname = unix_getname, | |
485 | .poll = unix_poll, | |
486 | .ioctl = unix_ioctl, | |
487 | .listen = unix_listen, | |
488 | .shutdown = unix_shutdown, | |
489 | .setsockopt = sock_no_setsockopt, | |
490 | .getsockopt = sock_no_getsockopt, | |
491 | .sendmsg = unix_stream_sendmsg, | |
492 | .recvmsg = unix_stream_recvmsg, | |
493 | .mmap = sock_no_mmap, | |
494 | .sendpage = sock_no_sendpage, | |
495 | }; | |
496 | ||
497 | static struct proto_ops unix_dgram_ops = { | |
498 | .family = PF_UNIX, | |
499 | .owner = THIS_MODULE, | |
500 | .release = unix_release, | |
501 | .bind = unix_bind, | |
502 | .connect = unix_dgram_connect, | |
503 | .socketpair = unix_socketpair, | |
504 | .accept = sock_no_accept, | |
505 | .getname = unix_getname, | |
506 | .poll = datagram_poll, | |
507 | .ioctl = unix_ioctl, | |
508 | .listen = sock_no_listen, | |
509 | .shutdown = unix_shutdown, | |
510 | .setsockopt = sock_no_setsockopt, | |
511 | .getsockopt = sock_no_getsockopt, | |
512 | .sendmsg = unix_dgram_sendmsg, | |
513 | .recvmsg = unix_dgram_recvmsg, | |
514 | .mmap = sock_no_mmap, | |
515 | .sendpage = sock_no_sendpage, | |
516 | }; | |
517 | ||
518 | static struct proto_ops unix_seqpacket_ops = { | |
519 | .family = PF_UNIX, | |
520 | .owner = THIS_MODULE, | |
521 | .release = unix_release, | |
522 | .bind = unix_bind, | |
523 | .connect = unix_stream_connect, | |
524 | .socketpair = unix_socketpair, | |
525 | .accept = unix_accept, | |
526 | .getname = unix_getname, | |
527 | .poll = datagram_poll, | |
528 | .ioctl = unix_ioctl, | |
529 | .listen = unix_listen, | |
530 | .shutdown = unix_shutdown, | |
531 | .setsockopt = sock_no_setsockopt, | |
532 | .getsockopt = sock_no_getsockopt, | |
533 | .sendmsg = unix_seqpacket_sendmsg, | |
534 | .recvmsg = unix_dgram_recvmsg, | |
535 | .mmap = sock_no_mmap, | |
536 | .sendpage = sock_no_sendpage, | |
537 | }; | |
538 | ||
539 | static struct proto unix_proto = { | |
540 | .name = "UNIX", | |
541 | .owner = THIS_MODULE, | |
542 | .obj_size = sizeof(struct unix_sock), | |
543 | }; | |
544 | ||
545 | static struct sock * unix_create1(struct socket *sock) | |
546 | { | |
547 | struct sock *sk = NULL; | |
548 | struct unix_sock *u; | |
549 | ||
550 | if (atomic_read(&unix_nr_socks) >= 2*files_stat.max_files) | |
551 | goto out; | |
552 | ||
553 | sk = sk_alloc(PF_UNIX, GFP_KERNEL, &unix_proto, 1); | |
554 | if (!sk) | |
555 | goto out; | |
556 | ||
557 | atomic_inc(&unix_nr_socks); | |
558 | ||
559 | sock_init_data(sock,sk); | |
560 | ||
561 | sk->sk_write_space = unix_write_space; | |
562 | sk->sk_max_ack_backlog = sysctl_unix_max_dgram_qlen; | |
563 | sk->sk_destruct = unix_sock_destructor; | |
564 | u = unix_sk(sk); | |
565 | u->dentry = NULL; | |
566 | u->mnt = NULL; | |
567 | rwlock_init(&u->lock); | |
568 | atomic_set(&u->inflight, sock ? 0 : -1); | |
569 | init_MUTEX(&u->readsem); /* single task reading lock */ | |
570 | init_waitqueue_head(&u->peer_wait); | |
571 | unix_insert_socket(unix_sockets_unbound, sk); | |
572 | out: | |
573 | return sk; | |
574 | } | |
575 | ||
576 | static int unix_create(struct socket *sock, int protocol) | |
577 | { | |
578 | if (protocol && protocol != PF_UNIX) | |
579 | return -EPROTONOSUPPORT; | |
580 | ||
581 | sock->state = SS_UNCONNECTED; | |
582 | ||
583 | switch (sock->type) { | |
584 | case SOCK_STREAM: | |
585 | sock->ops = &unix_stream_ops; | |
586 | break; | |
587 | /* | |
588 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
589 | * nothing uses it. | |
590 | */ | |
591 | case SOCK_RAW: | |
592 | sock->type=SOCK_DGRAM; | |
593 | case SOCK_DGRAM: | |
594 | sock->ops = &unix_dgram_ops; | |
595 | break; | |
596 | case SOCK_SEQPACKET: | |
597 | sock->ops = &unix_seqpacket_ops; | |
598 | break; | |
599 | default: | |
600 | return -ESOCKTNOSUPPORT; | |
601 | } | |
602 | ||
603 | return unix_create1(sock) ? 0 : -ENOMEM; | |
604 | } | |
605 | ||
606 | static int unix_release(struct socket *sock) | |
607 | { | |
608 | struct sock *sk = sock->sk; | |
609 | ||
610 | if (!sk) | |
611 | return 0; | |
612 | ||
613 | sock->sk = NULL; | |
614 | ||
615 | return unix_release_sock (sk, 0); | |
616 | } | |
617 | ||
618 | static int unix_autobind(struct socket *sock) | |
619 | { | |
620 | struct sock *sk = sock->sk; | |
621 | struct unix_sock *u = unix_sk(sk); | |
622 | static u32 ordernum = 1; | |
623 | struct unix_address * addr; | |
624 | int err; | |
625 | ||
626 | down(&u->readsem); | |
627 | ||
628 | err = 0; | |
629 | if (u->addr) | |
630 | goto out; | |
631 | ||
632 | err = -ENOMEM; | |
633 | addr = kmalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); | |
634 | if (!addr) | |
635 | goto out; | |
636 | ||
637 | memset(addr, 0, sizeof(*addr) + sizeof(short) + 16); | |
638 | addr->name->sun_family = AF_UNIX; | |
639 | atomic_set(&addr->refcnt, 1); | |
640 | ||
641 | retry: | |
642 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
643 | addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0)); | |
644 | ||
645 | write_lock(&unix_table_lock); | |
646 | ordernum = (ordernum+1)&0xFFFFF; | |
647 | ||
648 | if (__unix_find_socket_byname(addr->name, addr->len, sock->type, | |
649 | addr->hash)) { | |
650 | write_unlock(&unix_table_lock); | |
651 | /* Sanity yield. It is unusual case, but yet... */ | |
652 | if (!(ordernum&0xFF)) | |
653 | yield(); | |
654 | goto retry; | |
655 | } | |
656 | addr->hash ^= sk->sk_type; | |
657 | ||
658 | __unix_remove_socket(sk); | |
659 | u->addr = addr; | |
660 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
661 | write_unlock(&unix_table_lock); | |
662 | err = 0; | |
663 | ||
664 | out: up(&u->readsem); | |
665 | return err; | |
666 | } | |
667 | ||
668 | static struct sock *unix_find_other(struct sockaddr_un *sunname, int len, | |
669 | int type, unsigned hash, int *error) | |
670 | { | |
671 | struct sock *u; | |
672 | struct nameidata nd; | |
673 | int err = 0; | |
674 | ||
675 | if (sunname->sun_path[0]) { | |
676 | err = path_lookup(sunname->sun_path, LOOKUP_FOLLOW, &nd); | |
677 | if (err) | |
678 | goto fail; | |
679 | err = permission(nd.dentry->d_inode,MAY_WRITE, &nd); | |
680 | if (err) | |
681 | goto put_fail; | |
682 | ||
683 | err = -ECONNREFUSED; | |
684 | if (!S_ISSOCK(nd.dentry->d_inode->i_mode)) | |
685 | goto put_fail; | |
686 | u=unix_find_socket_byinode(nd.dentry->d_inode); | |
687 | if (!u) | |
688 | goto put_fail; | |
689 | ||
690 | if (u->sk_type == type) | |
691 | touch_atime(nd.mnt, nd.dentry); | |
692 | ||
693 | path_release(&nd); | |
694 | ||
695 | err=-EPROTOTYPE; | |
696 | if (u->sk_type != type) { | |
697 | sock_put(u); | |
698 | goto fail; | |
699 | } | |
700 | } else { | |
701 | err = -ECONNREFUSED; | |
702 | u=unix_find_socket_byname(sunname, len, type, hash); | |
703 | if (u) { | |
704 | struct dentry *dentry; | |
705 | dentry = unix_sk(u)->dentry; | |
706 | if (dentry) | |
707 | touch_atime(unix_sk(u)->mnt, dentry); | |
708 | } else | |
709 | goto fail; | |
710 | } | |
711 | return u; | |
712 | ||
713 | put_fail: | |
714 | path_release(&nd); | |
715 | fail: | |
716 | *error=err; | |
717 | return NULL; | |
718 | } | |
719 | ||
720 | ||
721 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
722 | { | |
723 | struct sock *sk = sock->sk; | |
724 | struct unix_sock *u = unix_sk(sk); | |
725 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
726 | struct dentry * dentry = NULL; | |
727 | struct nameidata nd; | |
728 | int err; | |
729 | unsigned hash; | |
730 | struct unix_address *addr; | |
731 | struct hlist_head *list; | |
732 | ||
733 | err = -EINVAL; | |
734 | if (sunaddr->sun_family != AF_UNIX) | |
735 | goto out; | |
736 | ||
737 | if (addr_len==sizeof(short)) { | |
738 | err = unix_autobind(sock); | |
739 | goto out; | |
740 | } | |
741 | ||
742 | err = unix_mkname(sunaddr, addr_len, &hash); | |
743 | if (err < 0) | |
744 | goto out; | |
745 | addr_len = err; | |
746 | ||
747 | down(&u->readsem); | |
748 | ||
749 | err = -EINVAL; | |
750 | if (u->addr) | |
751 | goto out_up; | |
752 | ||
753 | err = -ENOMEM; | |
754 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
755 | if (!addr) | |
756 | goto out_up; | |
757 | ||
758 | memcpy(addr->name, sunaddr, addr_len); | |
759 | addr->len = addr_len; | |
760 | addr->hash = hash ^ sk->sk_type; | |
761 | atomic_set(&addr->refcnt, 1); | |
762 | ||
763 | if (sunaddr->sun_path[0]) { | |
764 | unsigned int mode; | |
765 | err = 0; | |
766 | /* | |
767 | * Get the parent directory, calculate the hash for last | |
768 | * component. | |
769 | */ | |
770 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); | |
771 | if (err) | |
772 | goto out_mknod_parent; | |
f81a0bff CH |
773 | |
774 | dentry = lookup_create(&nd, 0); | |
1da177e4 LT |
775 | err = PTR_ERR(dentry); |
776 | if (IS_ERR(dentry)) | |
777 | goto out_mknod_unlock; | |
f81a0bff | 778 | |
1da177e4 LT |
779 | /* |
780 | * All right, let's create it. | |
781 | */ | |
782 | mode = S_IFSOCK | | |
783 | (SOCK_INODE(sock)->i_mode & ~current->fs->umask); | |
784 | err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0); | |
785 | if (err) | |
786 | goto out_mknod_dput; | |
787 | up(&nd.dentry->d_inode->i_sem); | |
788 | dput(nd.dentry); | |
789 | nd.dentry = dentry; | |
790 | ||
791 | addr->hash = UNIX_HASH_SIZE; | |
792 | } | |
793 | ||
794 | write_lock(&unix_table_lock); | |
795 | ||
796 | if (!sunaddr->sun_path[0]) { | |
797 | err = -EADDRINUSE; | |
798 | if (__unix_find_socket_byname(sunaddr, addr_len, | |
799 | sk->sk_type, hash)) { | |
800 | unix_release_addr(addr); | |
801 | goto out_unlock; | |
802 | } | |
803 | ||
804 | list = &unix_socket_table[addr->hash]; | |
805 | } else { | |
806 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; | |
807 | u->dentry = nd.dentry; | |
808 | u->mnt = nd.mnt; | |
809 | } | |
810 | ||
811 | err = 0; | |
812 | __unix_remove_socket(sk); | |
813 | u->addr = addr; | |
814 | __unix_insert_socket(list, sk); | |
815 | ||
816 | out_unlock: | |
817 | write_unlock(&unix_table_lock); | |
818 | out_up: | |
819 | up(&u->readsem); | |
820 | out: | |
821 | return err; | |
822 | ||
823 | out_mknod_dput: | |
824 | dput(dentry); | |
825 | out_mknod_unlock: | |
826 | up(&nd.dentry->d_inode->i_sem); | |
1da177e4 LT |
827 | path_release(&nd); |
828 | out_mknod_parent: | |
829 | if (err==-EEXIST) | |
830 | err=-EADDRINUSE; | |
831 | unix_release_addr(addr); | |
832 | goto out_up; | |
833 | } | |
834 | ||
835 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, | |
836 | int alen, int flags) | |
837 | { | |
838 | struct sock *sk = sock->sk; | |
839 | struct sockaddr_un *sunaddr=(struct sockaddr_un*)addr; | |
840 | struct sock *other; | |
841 | unsigned hash; | |
842 | int err; | |
843 | ||
844 | if (addr->sa_family != AF_UNSPEC) { | |
845 | err = unix_mkname(sunaddr, alen, &hash); | |
846 | if (err < 0) | |
847 | goto out; | |
848 | alen = err; | |
849 | ||
850 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
851 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
852 | goto out; | |
853 | ||
854 | other=unix_find_other(sunaddr, alen, sock->type, hash, &err); | |
855 | if (!other) | |
856 | goto out; | |
857 | ||
858 | unix_state_wlock(sk); | |
859 | ||
860 | err = -EPERM; | |
861 | if (!unix_may_send(sk, other)) | |
862 | goto out_unlock; | |
863 | ||
864 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
865 | if (err) | |
866 | goto out_unlock; | |
867 | ||
868 | } else { | |
869 | /* | |
870 | * 1003.1g breaking connected state with AF_UNSPEC | |
871 | */ | |
872 | other = NULL; | |
873 | unix_state_wlock(sk); | |
874 | } | |
875 | ||
876 | /* | |
877 | * If it was connected, reconnect. | |
878 | */ | |
879 | if (unix_peer(sk)) { | |
880 | struct sock *old_peer = unix_peer(sk); | |
881 | unix_peer(sk)=other; | |
882 | unix_state_wunlock(sk); | |
883 | ||
884 | if (other != old_peer) | |
885 | unix_dgram_disconnected(sk, old_peer); | |
886 | sock_put(old_peer); | |
887 | } else { | |
888 | unix_peer(sk)=other; | |
889 | unix_state_wunlock(sk); | |
890 | } | |
891 | return 0; | |
892 | ||
893 | out_unlock: | |
894 | unix_state_wunlock(sk); | |
895 | sock_put(other); | |
896 | out: | |
897 | return err; | |
898 | } | |
899 | ||
900 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
901 | { | |
902 | struct unix_sock *u = unix_sk(other); | |
903 | int sched; | |
904 | DEFINE_WAIT(wait); | |
905 | ||
906 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
907 | ||
908 | sched = !sock_flag(other, SOCK_DEAD) && | |
909 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
910 | (skb_queue_len(&other->sk_receive_queue) > | |
911 | other->sk_max_ack_backlog); | |
912 | ||
913 | unix_state_runlock(other); | |
914 | ||
915 | if (sched) | |
916 | timeo = schedule_timeout(timeo); | |
917 | ||
918 | finish_wait(&u->peer_wait, &wait); | |
919 | return timeo; | |
920 | } | |
921 | ||
922 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
923 | int addr_len, int flags) | |
924 | { | |
925 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
926 | struct sock *sk = sock->sk; | |
927 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; | |
928 | struct sock *newsk = NULL; | |
929 | struct sock *other = NULL; | |
930 | struct sk_buff *skb = NULL; | |
931 | unsigned hash; | |
932 | int st; | |
933 | int err; | |
934 | long timeo; | |
935 | ||
936 | err = unix_mkname(sunaddr, addr_len, &hash); | |
937 | if (err < 0) | |
938 | goto out; | |
939 | addr_len = err; | |
940 | ||
941 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
942 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
943 | goto out; | |
944 | ||
945 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
946 | ||
947 | /* First of all allocate resources. | |
948 | If we will make it after state is locked, | |
949 | we will have to recheck all again in any case. | |
950 | */ | |
951 | ||
952 | err = -ENOMEM; | |
953 | ||
954 | /* create new sock for complete connection */ | |
955 | newsk = unix_create1(NULL); | |
956 | if (newsk == NULL) | |
957 | goto out; | |
958 | ||
959 | /* Allocate skb for sending to listening sock */ | |
960 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
961 | if (skb == NULL) | |
962 | goto out; | |
963 | ||
964 | restart: | |
965 | /* Find listening sock. */ | |
966 | other = unix_find_other(sunaddr, addr_len, sk->sk_type, hash, &err); | |
967 | if (!other) | |
968 | goto out; | |
969 | ||
970 | /* Latch state of peer */ | |
971 | unix_state_rlock(other); | |
972 | ||
973 | /* Apparently VFS overslept socket death. Retry. */ | |
974 | if (sock_flag(other, SOCK_DEAD)) { | |
975 | unix_state_runlock(other); | |
976 | sock_put(other); | |
977 | goto restart; | |
978 | } | |
979 | ||
980 | err = -ECONNREFUSED; | |
981 | if (other->sk_state != TCP_LISTEN) | |
982 | goto out_unlock; | |
983 | ||
984 | if (skb_queue_len(&other->sk_receive_queue) > | |
985 | other->sk_max_ack_backlog) { | |
986 | err = -EAGAIN; | |
987 | if (!timeo) | |
988 | goto out_unlock; | |
989 | ||
990 | timeo = unix_wait_for_peer(other, timeo); | |
991 | ||
992 | err = sock_intr_errno(timeo); | |
993 | if (signal_pending(current)) | |
994 | goto out; | |
995 | sock_put(other); | |
996 | goto restart; | |
997 | } | |
998 | ||
999 | /* Latch our state. | |
1000 | ||
1001 | It is tricky place. We need to grab write lock and cannot | |
1002 | drop lock on peer. It is dangerous because deadlock is | |
1003 | possible. Connect to self case and simultaneous | |
1004 | attempt to connect are eliminated by checking socket | |
1005 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1006 | check this before attempt to grab lock. | |
1007 | ||
1008 | Well, and we have to recheck the state after socket locked. | |
1009 | */ | |
1010 | st = sk->sk_state; | |
1011 | ||
1012 | switch (st) { | |
1013 | case TCP_CLOSE: | |
1014 | /* This is ok... continue with connect */ | |
1015 | break; | |
1016 | case TCP_ESTABLISHED: | |
1017 | /* Socket is already connected */ | |
1018 | err = -EISCONN; | |
1019 | goto out_unlock; | |
1020 | default: | |
1021 | err = -EINVAL; | |
1022 | goto out_unlock; | |
1023 | } | |
1024 | ||
1025 | unix_state_wlock(sk); | |
1026 | ||
1027 | if (sk->sk_state != st) { | |
1028 | unix_state_wunlock(sk); | |
1029 | unix_state_runlock(other); | |
1030 | sock_put(other); | |
1031 | goto restart; | |
1032 | } | |
1033 | ||
1034 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); | |
1035 | if (err) { | |
1036 | unix_state_wunlock(sk); | |
1037 | goto out_unlock; | |
1038 | } | |
1039 | ||
1040 | /* The way is open! Fastly set all the necessary fields... */ | |
1041 | ||
1042 | sock_hold(sk); | |
1043 | unix_peer(newsk) = sk; | |
1044 | newsk->sk_state = TCP_ESTABLISHED; | |
1045 | newsk->sk_type = sk->sk_type; | |
1046 | newsk->sk_peercred.pid = current->tgid; | |
1047 | newsk->sk_peercred.uid = current->euid; | |
1048 | newsk->sk_peercred.gid = current->egid; | |
1049 | newu = unix_sk(newsk); | |
1050 | newsk->sk_sleep = &newu->peer_wait; | |
1051 | otheru = unix_sk(other); | |
1052 | ||
1053 | /* copy address information from listening to new sock*/ | |
1054 | if (otheru->addr) { | |
1055 | atomic_inc(&otheru->addr->refcnt); | |
1056 | newu->addr = otheru->addr; | |
1057 | } | |
1058 | if (otheru->dentry) { | |
1059 | newu->dentry = dget(otheru->dentry); | |
1060 | newu->mnt = mntget(otheru->mnt); | |
1061 | } | |
1062 | ||
1063 | /* Set credentials */ | |
1064 | sk->sk_peercred = other->sk_peercred; | |
1065 | ||
1066 | sock_hold(newsk); | |
1067 | unix_peer(sk) = newsk; | |
1068 | sock->state = SS_CONNECTED; | |
1069 | sk->sk_state = TCP_ESTABLISHED; | |
1070 | ||
1071 | unix_state_wunlock(sk); | |
1072 | ||
1073 | /* take ten and and send info to listening sock */ | |
1074 | spin_lock(&other->sk_receive_queue.lock); | |
1075 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1076 | /* Undo artificially decreased inflight after embrion | |
1077 | * is installed to listening socket. */ | |
1078 | atomic_inc(&newu->inflight); | |
1079 | spin_unlock(&other->sk_receive_queue.lock); | |
1080 | unix_state_runlock(other); | |
1081 | other->sk_data_ready(other, 0); | |
1082 | sock_put(other); | |
1083 | return 0; | |
1084 | ||
1085 | out_unlock: | |
1086 | if (other) | |
1087 | unix_state_runlock(other); | |
1088 | ||
1089 | out: | |
1090 | if (skb) | |
1091 | kfree_skb(skb); | |
1092 | if (newsk) | |
1093 | unix_release_sock(newsk, 0); | |
1094 | if (other) | |
1095 | sock_put(other); | |
1096 | return err; | |
1097 | } | |
1098 | ||
1099 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1100 | { | |
1101 | struct sock *ska=socka->sk, *skb = sockb->sk; | |
1102 | ||
1103 | /* Join our sockets back to back */ | |
1104 | sock_hold(ska); | |
1105 | sock_hold(skb); | |
1106 | unix_peer(ska)=skb; | |
1107 | unix_peer(skb)=ska; | |
1108 | ska->sk_peercred.pid = skb->sk_peercred.pid = current->tgid; | |
1109 | ska->sk_peercred.uid = skb->sk_peercred.uid = current->euid; | |
1110 | ska->sk_peercred.gid = skb->sk_peercred.gid = current->egid; | |
1111 | ||
1112 | if (ska->sk_type != SOCK_DGRAM) { | |
1113 | ska->sk_state = TCP_ESTABLISHED; | |
1114 | skb->sk_state = TCP_ESTABLISHED; | |
1115 | socka->state = SS_CONNECTED; | |
1116 | sockb->state = SS_CONNECTED; | |
1117 | } | |
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) | |
1122 | { | |
1123 | struct sock *sk = sock->sk; | |
1124 | struct sock *tsk; | |
1125 | struct sk_buff *skb; | |
1126 | int err; | |
1127 | ||
1128 | err = -EOPNOTSUPP; | |
1129 | if (sock->type!=SOCK_STREAM && sock->type!=SOCK_SEQPACKET) | |
1130 | goto out; | |
1131 | ||
1132 | err = -EINVAL; | |
1133 | if (sk->sk_state != TCP_LISTEN) | |
1134 | goto out; | |
1135 | ||
1136 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1137 | * so that no locks are necessary. | |
1138 | */ | |
1139 | ||
1140 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1141 | if (!skb) { | |
1142 | /* This means receive shutdown. */ | |
1143 | if (err == 0) | |
1144 | err = -EINVAL; | |
1145 | goto out; | |
1146 | } | |
1147 | ||
1148 | tsk = skb->sk; | |
1149 | skb_free_datagram(sk, skb); | |
1150 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1151 | ||
1152 | /* attach accepted sock to socket */ | |
1153 | unix_state_wlock(tsk); | |
1154 | newsock->state = SS_CONNECTED; | |
1155 | sock_graft(tsk, newsock); | |
1156 | unix_state_wunlock(tsk); | |
1157 | return 0; | |
1158 | ||
1159 | out: | |
1160 | return err; | |
1161 | } | |
1162 | ||
1163 | ||
1164 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1165 | { | |
1166 | struct sock *sk = sock->sk; | |
1167 | struct unix_sock *u; | |
1168 | struct sockaddr_un *sunaddr=(struct sockaddr_un *)uaddr; | |
1169 | int err = 0; | |
1170 | ||
1171 | if (peer) { | |
1172 | sk = unix_peer_get(sk); | |
1173 | ||
1174 | err = -ENOTCONN; | |
1175 | if (!sk) | |
1176 | goto out; | |
1177 | err = 0; | |
1178 | } else { | |
1179 | sock_hold(sk); | |
1180 | } | |
1181 | ||
1182 | u = unix_sk(sk); | |
1183 | unix_state_rlock(sk); | |
1184 | if (!u->addr) { | |
1185 | sunaddr->sun_family = AF_UNIX; | |
1186 | sunaddr->sun_path[0] = 0; | |
1187 | *uaddr_len = sizeof(short); | |
1188 | } else { | |
1189 | struct unix_address *addr = u->addr; | |
1190 | ||
1191 | *uaddr_len = addr->len; | |
1192 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1193 | } | |
1194 | unix_state_runlock(sk); | |
1195 | sock_put(sk); | |
1196 | out: | |
1197 | return err; | |
1198 | } | |
1199 | ||
1200 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1201 | { | |
1202 | int i; | |
1203 | ||
1204 | scm->fp = UNIXCB(skb).fp; | |
1205 | skb->destructor = sock_wfree; | |
1206 | UNIXCB(skb).fp = NULL; | |
1207 | ||
1208 | for (i=scm->fp->count-1; i>=0; i--) | |
1209 | unix_notinflight(scm->fp->fp[i]); | |
1210 | } | |
1211 | ||
1212 | static void unix_destruct_fds(struct sk_buff *skb) | |
1213 | { | |
1214 | struct scm_cookie scm; | |
1215 | memset(&scm, 0, sizeof(scm)); | |
1216 | unix_detach_fds(&scm, skb); | |
1217 | ||
1218 | /* Alas, it calls VFS */ | |
1219 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1220 | scm_destroy(&scm); | |
1221 | sock_wfree(skb); | |
1222 | } | |
1223 | ||
1224 | static void unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1225 | { | |
1226 | int i; | |
1227 | for (i=scm->fp->count-1; i>=0; i--) | |
1228 | unix_inflight(scm->fp->fp[i]); | |
1229 | UNIXCB(skb).fp = scm->fp; | |
1230 | skb->destructor = unix_destruct_fds; | |
1231 | scm->fp = NULL; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Send AF_UNIX data. | |
1236 | */ | |
1237 | ||
1238 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1239 | struct msghdr *msg, size_t len) | |
1240 | { | |
1241 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1242 | struct sock *sk = sock->sk; | |
1243 | struct unix_sock *u = unix_sk(sk); | |
1244 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1245 | struct sock *other = NULL; | |
1246 | int namelen = 0; /* fake GCC */ | |
1247 | int err; | |
1248 | unsigned hash; | |
1249 | struct sk_buff *skb; | |
1250 | long timeo; | |
1251 | struct scm_cookie tmp_scm; | |
1252 | ||
1253 | if (NULL == siocb->scm) | |
1254 | siocb->scm = &tmp_scm; | |
1255 | err = scm_send(sock, msg, siocb->scm); | |
1256 | if (err < 0) | |
1257 | return err; | |
1258 | ||
1259 | err = -EOPNOTSUPP; | |
1260 | if (msg->msg_flags&MSG_OOB) | |
1261 | goto out; | |
1262 | ||
1263 | if (msg->msg_namelen) { | |
1264 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1265 | if (err < 0) | |
1266 | goto out; | |
1267 | namelen = err; | |
1268 | } else { | |
1269 | sunaddr = NULL; | |
1270 | err = -ENOTCONN; | |
1271 | other = unix_peer_get(sk); | |
1272 | if (!other) | |
1273 | goto out; | |
1274 | } | |
1275 | ||
1276 | if (test_bit(SOCK_PASSCRED, &sock->flags) | |
1277 | && !u->addr && (err = unix_autobind(sock)) != 0) | |
1278 | goto out; | |
1279 | ||
1280 | err = -EMSGSIZE; | |
1281 | if (len > sk->sk_sndbuf - 32) | |
1282 | goto out; | |
1283 | ||
1284 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); | |
1285 | if (skb==NULL) | |
1286 | goto out; | |
1287 | ||
1288 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1289 | if (siocb->scm->fp) | |
1290 | unix_attach_fds(siocb->scm, skb); | |
1291 | ||
1292 | skb->h.raw = skb->data; | |
1293 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
1294 | if (err) | |
1295 | goto out_free; | |
1296 | ||
1297 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1298 | ||
1299 | restart: | |
1300 | if (!other) { | |
1301 | err = -ECONNRESET; | |
1302 | if (sunaddr == NULL) | |
1303 | goto out_free; | |
1304 | ||
1305 | other = unix_find_other(sunaddr, namelen, sk->sk_type, | |
1306 | hash, &err); | |
1307 | if (other==NULL) | |
1308 | goto out_free; | |
1309 | } | |
1310 | ||
1311 | unix_state_rlock(other); | |
1312 | err = -EPERM; | |
1313 | if (!unix_may_send(sk, other)) | |
1314 | goto out_unlock; | |
1315 | ||
1316 | if (sock_flag(other, SOCK_DEAD)) { | |
1317 | /* | |
1318 | * Check with 1003.1g - what should | |
1319 | * datagram error | |
1320 | */ | |
1321 | unix_state_runlock(other); | |
1322 | sock_put(other); | |
1323 | ||
1324 | err = 0; | |
1325 | unix_state_wlock(sk); | |
1326 | if (unix_peer(sk) == other) { | |
1327 | unix_peer(sk)=NULL; | |
1328 | unix_state_wunlock(sk); | |
1329 | ||
1330 | unix_dgram_disconnected(sk, other); | |
1331 | sock_put(other); | |
1332 | err = -ECONNREFUSED; | |
1333 | } else { | |
1334 | unix_state_wunlock(sk); | |
1335 | } | |
1336 | ||
1337 | other = NULL; | |
1338 | if (err) | |
1339 | goto out_free; | |
1340 | goto restart; | |
1341 | } | |
1342 | ||
1343 | err = -EPIPE; | |
1344 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1345 | goto out_unlock; | |
1346 | ||
1347 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1348 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1349 | if (err) | |
1350 | goto out_unlock; | |
1351 | } | |
1352 | ||
1353 | if (unix_peer(other) != sk && | |
1354 | (skb_queue_len(&other->sk_receive_queue) > | |
1355 | other->sk_max_ack_backlog)) { | |
1356 | if (!timeo) { | |
1357 | err = -EAGAIN; | |
1358 | goto out_unlock; | |
1359 | } | |
1360 | ||
1361 | timeo = unix_wait_for_peer(other, timeo); | |
1362 | ||
1363 | err = sock_intr_errno(timeo); | |
1364 | if (signal_pending(current)) | |
1365 | goto out_free; | |
1366 | ||
1367 | goto restart; | |
1368 | } | |
1369 | ||
1370 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1371 | unix_state_runlock(other); | |
1372 | other->sk_data_ready(other, len); | |
1373 | sock_put(other); | |
1374 | scm_destroy(siocb->scm); | |
1375 | return len; | |
1376 | ||
1377 | out_unlock: | |
1378 | unix_state_runlock(other); | |
1379 | out_free: | |
1380 | kfree_skb(skb); | |
1381 | out: | |
1382 | if (other) | |
1383 | sock_put(other); | |
1384 | scm_destroy(siocb->scm); | |
1385 | return err; | |
1386 | } | |
1387 | ||
1388 | ||
1389 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1390 | struct msghdr *msg, size_t len) | |
1391 | { | |
1392 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); | |
1393 | struct sock *sk = sock->sk; | |
1394 | struct sock *other = NULL; | |
1395 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1396 | int err,size; | |
1397 | struct sk_buff *skb; | |
1398 | int sent=0; | |
1399 | struct scm_cookie tmp_scm; | |
1400 | ||
1401 | if (NULL == siocb->scm) | |
1402 | siocb->scm = &tmp_scm; | |
1403 | err = scm_send(sock, msg, siocb->scm); | |
1404 | if (err < 0) | |
1405 | return err; | |
1406 | ||
1407 | err = -EOPNOTSUPP; | |
1408 | if (msg->msg_flags&MSG_OOB) | |
1409 | goto out_err; | |
1410 | ||
1411 | if (msg->msg_namelen) { | |
1412 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1413 | goto out_err; | |
1414 | } else { | |
1415 | sunaddr = NULL; | |
1416 | err = -ENOTCONN; | |
1417 | other = unix_peer_get(sk); | |
1418 | if (!other) | |
1419 | goto out_err; | |
1420 | } | |
1421 | ||
1422 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1423 | goto pipe_err; | |
1424 | ||
1425 | while(sent < len) | |
1426 | { | |
1427 | /* | |
1428 | * Optimisation for the fact that under 0.01% of X messages typically | |
1429 | * need breaking up. | |
1430 | */ | |
1431 | ||
1432 | size=len-sent; | |
1433 | ||
1434 | /* Keep two messages in the pipe so it schedules better */ | |
1435 | if (size > sk->sk_sndbuf / 2 - 64) | |
1436 | size = sk->sk_sndbuf / 2 - 64; | |
1437 | ||
1438 | if (size > SKB_MAX_ALLOC) | |
1439 | size = SKB_MAX_ALLOC; | |
1440 | ||
1441 | /* | |
1442 | * Grab a buffer | |
1443 | */ | |
1444 | ||
1445 | skb=sock_alloc_send_skb(sk,size,msg->msg_flags&MSG_DONTWAIT, &err); | |
1446 | ||
1447 | if (skb==NULL) | |
1448 | goto out_err; | |
1449 | ||
1450 | /* | |
1451 | * If you pass two values to the sock_alloc_send_skb | |
1452 | * it tries to grab the large buffer with GFP_NOFS | |
1453 | * (which can fail easily), and if it fails grab the | |
1454 | * fallback size buffer which is under a page and will | |
1455 | * succeed. [Alan] | |
1456 | */ | |
1457 | size = min_t(int, size, skb_tailroom(skb)); | |
1458 | ||
1459 | memcpy(UNIXCREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); | |
1460 | if (siocb->scm->fp) | |
1461 | unix_attach_fds(siocb->scm, skb); | |
1462 | ||
1463 | if ((err = memcpy_fromiovec(skb_put(skb,size), msg->msg_iov, size)) != 0) { | |
1464 | kfree_skb(skb); | |
1465 | goto out_err; | |
1466 | } | |
1467 | ||
1468 | unix_state_rlock(other); | |
1469 | ||
1470 | if (sock_flag(other, SOCK_DEAD) || | |
1471 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1472 | goto pipe_err_free; | |
1473 | ||
1474 | skb_queue_tail(&other->sk_receive_queue, skb); | |
1475 | unix_state_runlock(other); | |
1476 | other->sk_data_ready(other, size); | |
1477 | sent+=size; | |
1478 | } | |
1479 | sock_put(other); | |
1480 | ||
1481 | scm_destroy(siocb->scm); | |
1482 | siocb->scm = NULL; | |
1483 | ||
1484 | return sent; | |
1485 | ||
1486 | pipe_err_free: | |
1487 | unix_state_runlock(other); | |
1488 | kfree_skb(skb); | |
1489 | pipe_err: | |
1490 | if (sent==0 && !(msg->msg_flags&MSG_NOSIGNAL)) | |
1491 | send_sig(SIGPIPE,current,0); | |
1492 | err = -EPIPE; | |
1493 | out_err: | |
1494 | if (other) | |
1495 | sock_put(other); | |
1496 | scm_destroy(siocb->scm); | |
1497 | siocb->scm = NULL; | |
1498 | return sent ? : err; | |
1499 | } | |
1500 | ||
1501 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, | |
1502 | struct msghdr *msg, size_t len) | |
1503 | { | |
1504 | int err; | |
1505 | struct sock *sk = sock->sk; | |
1506 | ||
1507 | err = sock_error(sk); | |
1508 | if (err) | |
1509 | return err; | |
1510 | ||
1511 | if (sk->sk_state != TCP_ESTABLISHED) | |
1512 | return -ENOTCONN; | |
1513 | ||
1514 | if (msg->msg_namelen) | |
1515 | msg->msg_namelen = 0; | |
1516 | ||
1517 | return unix_dgram_sendmsg(kiocb, sock, msg, len); | |
1518 | } | |
1519 | ||
1520 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) | |
1521 | { | |
1522 | struct unix_sock *u = unix_sk(sk); | |
1523 | ||
1524 | msg->msg_namelen = 0; | |
1525 | if (u->addr) { | |
1526 | msg->msg_namelen = u->addr->len; | |
1527 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1528 | } | |
1529 | } | |
1530 | ||
1531 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1532 | struct msghdr *msg, size_t size, | |
1533 | int flags) | |
1534 | { | |
1535 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1536 | struct scm_cookie tmp_scm; | |
1537 | struct sock *sk = sock->sk; | |
1538 | struct unix_sock *u = unix_sk(sk); | |
1539 | int noblock = flags & MSG_DONTWAIT; | |
1540 | struct sk_buff *skb; | |
1541 | int err; | |
1542 | ||
1543 | err = -EOPNOTSUPP; | |
1544 | if (flags&MSG_OOB) | |
1545 | goto out; | |
1546 | ||
1547 | msg->msg_namelen = 0; | |
1548 | ||
1549 | down(&u->readsem); | |
1550 | ||
1551 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
1552 | if (!skb) | |
1553 | goto out_unlock; | |
1554 | ||
1555 | wake_up_interruptible(&u->peer_wait); | |
1556 | ||
1557 | if (msg->msg_name) | |
1558 | unix_copy_addr(msg, skb->sk); | |
1559 | ||
1560 | if (size > skb->len) | |
1561 | size = skb->len; | |
1562 | else if (size < skb->len) | |
1563 | msg->msg_flags |= MSG_TRUNC; | |
1564 | ||
1565 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); | |
1566 | if (err) | |
1567 | goto out_free; | |
1568 | ||
1569 | if (!siocb->scm) { | |
1570 | siocb->scm = &tmp_scm; | |
1571 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1572 | } | |
1573 | siocb->scm->creds = *UNIXCREDS(skb); | |
1574 | ||
1575 | if (!(flags & MSG_PEEK)) | |
1576 | { | |
1577 | if (UNIXCB(skb).fp) | |
1578 | unix_detach_fds(siocb->scm, skb); | |
1579 | } | |
1580 | else | |
1581 | { | |
1582 | /* It is questionable: on PEEK we could: | |
1583 | - do not return fds - good, but too simple 8) | |
1584 | - return fds, and do not return them on read (old strategy, | |
1585 | apparently wrong) | |
1586 | - clone fds (I chose it for now, it is the most universal | |
1587 | solution) | |
1588 | ||
1589 | POSIX 1003.1g does not actually define this clearly | |
1590 | at all. POSIX 1003.1g doesn't define a lot of things | |
1591 | clearly however! | |
1592 | ||
1593 | */ | |
1594 | if (UNIXCB(skb).fp) | |
1595 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1596 | } | |
1597 | err = size; | |
1598 | ||
1599 | scm_recv(sock, msg, siocb->scm, flags); | |
1600 | ||
1601 | out_free: | |
1602 | skb_free_datagram(sk,skb); | |
1603 | out_unlock: | |
1604 | up(&u->readsem); | |
1605 | out: | |
1606 | return err; | |
1607 | } | |
1608 | ||
1609 | /* | |
1610 | * Sleep until data has arrive. But check for races.. | |
1611 | */ | |
1612 | ||
1613 | static long unix_stream_data_wait(struct sock * sk, long timeo) | |
1614 | { | |
1615 | DEFINE_WAIT(wait); | |
1616 | ||
1617 | unix_state_rlock(sk); | |
1618 | ||
1619 | for (;;) { | |
1620 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1621 | ||
1622 | if (skb_queue_len(&sk->sk_receive_queue) || | |
1623 | sk->sk_err || | |
1624 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1625 | signal_pending(current) || | |
1626 | !timeo) | |
1627 | break; | |
1628 | ||
1629 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1630 | unix_state_runlock(sk); | |
1631 | timeo = schedule_timeout(timeo); | |
1632 | unix_state_rlock(sk); | |
1633 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1634 | } | |
1635 | ||
1636 | finish_wait(sk->sk_sleep, &wait); | |
1637 | unix_state_runlock(sk); | |
1638 | return timeo; | |
1639 | } | |
1640 | ||
1641 | ||
1642 | ||
1643 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1644 | struct msghdr *msg, size_t size, | |
1645 | int flags) | |
1646 | { | |
1647 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); | |
1648 | struct scm_cookie tmp_scm; | |
1649 | struct sock *sk = sock->sk; | |
1650 | struct unix_sock *u = unix_sk(sk); | |
1651 | struct sockaddr_un *sunaddr=msg->msg_name; | |
1652 | int copied = 0; | |
1653 | int check_creds = 0; | |
1654 | int target; | |
1655 | int err = 0; | |
1656 | long timeo; | |
1657 | ||
1658 | err = -EINVAL; | |
1659 | if (sk->sk_state != TCP_ESTABLISHED) | |
1660 | goto out; | |
1661 | ||
1662 | err = -EOPNOTSUPP; | |
1663 | if (flags&MSG_OOB) | |
1664 | goto out; | |
1665 | ||
1666 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); | |
1667 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); | |
1668 | ||
1669 | msg->msg_namelen = 0; | |
1670 | ||
1671 | /* Lock the socket to prevent queue disordering | |
1672 | * while sleeps in memcpy_tomsg | |
1673 | */ | |
1674 | ||
1675 | if (!siocb->scm) { | |
1676 | siocb->scm = &tmp_scm; | |
1677 | memset(&tmp_scm, 0, sizeof(tmp_scm)); | |
1678 | } | |
1679 | ||
1680 | down(&u->readsem); | |
1681 | ||
1682 | do | |
1683 | { | |
1684 | int chunk; | |
1685 | struct sk_buff *skb; | |
1686 | ||
1687 | skb = skb_dequeue(&sk->sk_receive_queue); | |
1688 | if (skb==NULL) | |
1689 | { | |
1690 | if (copied >= target) | |
1691 | break; | |
1692 | ||
1693 | /* | |
1694 | * POSIX 1003.1g mandates this order. | |
1695 | */ | |
1696 | ||
1697 | if ((err = sock_error(sk)) != 0) | |
1698 | break; | |
1699 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
1700 | break; | |
1701 | err = -EAGAIN; | |
1702 | if (!timeo) | |
1703 | break; | |
1704 | up(&u->readsem); | |
1705 | ||
1706 | timeo = unix_stream_data_wait(sk, timeo); | |
1707 | ||
1708 | if (signal_pending(current)) { | |
1709 | err = sock_intr_errno(timeo); | |
1710 | goto out; | |
1711 | } | |
1712 | down(&u->readsem); | |
1713 | continue; | |
1714 | } | |
1715 | ||
1716 | if (check_creds) { | |
1717 | /* Never glue messages from different writers */ | |
1718 | if (memcmp(UNIXCREDS(skb), &siocb->scm->creds, sizeof(siocb->scm->creds)) != 0) { | |
1719 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1720 | break; | |
1721 | } | |
1722 | } else { | |
1723 | /* Copy credentials */ | |
1724 | siocb->scm->creds = *UNIXCREDS(skb); | |
1725 | check_creds = 1; | |
1726 | } | |
1727 | ||
1728 | /* Copy address just once */ | |
1729 | if (sunaddr) | |
1730 | { | |
1731 | unix_copy_addr(msg, skb->sk); | |
1732 | sunaddr = NULL; | |
1733 | } | |
1734 | ||
1735 | chunk = min_t(unsigned int, skb->len, size); | |
1736 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { | |
1737 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1738 | if (copied == 0) | |
1739 | copied = -EFAULT; | |
1740 | break; | |
1741 | } | |
1742 | copied += chunk; | |
1743 | size -= chunk; | |
1744 | ||
1745 | /* Mark read part of skb as used */ | |
1746 | if (!(flags & MSG_PEEK)) | |
1747 | { | |
1748 | skb_pull(skb, chunk); | |
1749 | ||
1750 | if (UNIXCB(skb).fp) | |
1751 | unix_detach_fds(siocb->scm, skb); | |
1752 | ||
1753 | /* put the skb back if we didn't use it up.. */ | |
1754 | if (skb->len) | |
1755 | { | |
1756 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1757 | break; | |
1758 | } | |
1759 | ||
1760 | kfree_skb(skb); | |
1761 | ||
1762 | if (siocb->scm->fp) | |
1763 | break; | |
1764 | } | |
1765 | else | |
1766 | { | |
1767 | /* It is questionable, see note in unix_dgram_recvmsg. | |
1768 | */ | |
1769 | if (UNIXCB(skb).fp) | |
1770 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); | |
1771 | ||
1772 | /* put message back and return */ | |
1773 | skb_queue_head(&sk->sk_receive_queue, skb); | |
1774 | break; | |
1775 | } | |
1776 | } while (size); | |
1777 | ||
1778 | up(&u->readsem); | |
1779 | scm_recv(sock, msg, siocb->scm, flags); | |
1780 | out: | |
1781 | return copied ? : err; | |
1782 | } | |
1783 | ||
1784 | static int unix_shutdown(struct socket *sock, int mode) | |
1785 | { | |
1786 | struct sock *sk = sock->sk; | |
1787 | struct sock *other; | |
1788 | ||
1789 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); | |
1790 | ||
1791 | if (mode) { | |
1792 | unix_state_wlock(sk); | |
1793 | sk->sk_shutdown |= mode; | |
1794 | other=unix_peer(sk); | |
1795 | if (other) | |
1796 | sock_hold(other); | |
1797 | unix_state_wunlock(sk); | |
1798 | sk->sk_state_change(sk); | |
1799 | ||
1800 | if (other && | |
1801 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
1802 | ||
1803 | int peer_mode = 0; | |
1804 | ||
1805 | if (mode&RCV_SHUTDOWN) | |
1806 | peer_mode |= SEND_SHUTDOWN; | |
1807 | if (mode&SEND_SHUTDOWN) | |
1808 | peer_mode |= RCV_SHUTDOWN; | |
1809 | unix_state_wlock(other); | |
1810 | other->sk_shutdown |= peer_mode; | |
1811 | unix_state_wunlock(other); | |
1812 | other->sk_state_change(other); | |
1813 | read_lock(&other->sk_callback_lock); | |
1814 | if (peer_mode == SHUTDOWN_MASK) | |
1815 | sk_wake_async(other,1,POLL_HUP); | |
1816 | else if (peer_mode & RCV_SHUTDOWN) | |
1817 | sk_wake_async(other,1,POLL_IN); | |
1818 | read_unlock(&other->sk_callback_lock); | |
1819 | } | |
1820 | if (other) | |
1821 | sock_put(other); | |
1822 | } | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1827 | { | |
1828 | struct sock *sk = sock->sk; | |
1829 | long amount=0; | |
1830 | int err; | |
1831 | ||
1832 | switch(cmd) | |
1833 | { | |
1834 | case SIOCOUTQ: | |
1835 | amount = atomic_read(&sk->sk_wmem_alloc); | |
1836 | err = put_user(amount, (int __user *)arg); | |
1837 | break; | |
1838 | case SIOCINQ: | |
1839 | { | |
1840 | struct sk_buff *skb; | |
1841 | ||
1842 | if (sk->sk_state == TCP_LISTEN) { | |
1843 | err = -EINVAL; | |
1844 | break; | |
1845 | } | |
1846 | ||
1847 | spin_lock(&sk->sk_receive_queue.lock); | |
1848 | if (sk->sk_type == SOCK_STREAM || | |
1849 | sk->sk_type == SOCK_SEQPACKET) { | |
1850 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
1851 | amount += skb->len; | |
1852 | } else { | |
1853 | skb = skb_peek(&sk->sk_receive_queue); | |
1854 | if (skb) | |
1855 | amount=skb->len; | |
1856 | } | |
1857 | spin_unlock(&sk->sk_receive_queue.lock); | |
1858 | err = put_user(amount, (int __user *)arg); | |
1859 | break; | |
1860 | } | |
1861 | ||
1862 | default: | |
1863 | err = dev_ioctl(cmd, (void __user *)arg); | |
1864 | break; | |
1865 | } | |
1866 | return err; | |
1867 | } | |
1868 | ||
1869 | static unsigned int unix_poll(struct file * file, struct socket *sock, poll_table *wait) | |
1870 | { | |
1871 | struct sock *sk = sock->sk; | |
1872 | unsigned int mask; | |
1873 | ||
1874 | poll_wait(file, sk->sk_sleep, wait); | |
1875 | mask = 0; | |
1876 | ||
1877 | /* exceptional events? */ | |
1878 | if (sk->sk_err) | |
1879 | mask |= POLLERR; | |
1880 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1881 | mask |= POLLHUP; | |
1882 | ||
1883 | /* readable? */ | |
1884 | if (!skb_queue_empty(&sk->sk_receive_queue) || | |
1885 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1886 | mask |= POLLIN | POLLRDNORM; | |
1887 | ||
1888 | /* Connection-based need to check for termination and startup */ | |
1889 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && sk->sk_state == TCP_CLOSE) | |
1890 | mask |= POLLHUP; | |
1891 | ||
1892 | /* | |
1893 | * we set writable also when the other side has shut down the | |
1894 | * connection. This prevents stuck sockets. | |
1895 | */ | |
1896 | if (unix_writable(sk)) | |
1897 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
1898 | ||
1899 | return mask; | |
1900 | } | |
1901 | ||
1902 | ||
1903 | #ifdef CONFIG_PROC_FS | |
1904 | static struct sock *unix_seq_idx(int *iter, loff_t pos) | |
1905 | { | |
1906 | loff_t off = 0; | |
1907 | struct sock *s; | |
1908 | ||
1909 | for (s = first_unix_socket(iter); s; s = next_unix_socket(iter, s)) { | |
1910 | if (off == pos) | |
1911 | return s; | |
1912 | ++off; | |
1913 | } | |
1914 | return NULL; | |
1915 | } | |
1916 | ||
1917 | ||
1918 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) | |
1919 | { | |
1920 | read_lock(&unix_table_lock); | |
1921 | return *pos ? unix_seq_idx(seq->private, *pos - 1) : ((void *) 1); | |
1922 | } | |
1923 | ||
1924 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1925 | { | |
1926 | ++*pos; | |
1927 | ||
1928 | if (v == (void *)1) | |
1929 | return first_unix_socket(seq->private); | |
1930 | return next_unix_socket(seq->private, v); | |
1931 | } | |
1932 | ||
1933 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
1934 | { | |
1935 | read_unlock(&unix_table_lock); | |
1936 | } | |
1937 | ||
1938 | static int unix_seq_show(struct seq_file *seq, void *v) | |
1939 | { | |
1940 | ||
1941 | if (v == (void *)1) | |
1942 | seq_puts(seq, "Num RefCount Protocol Flags Type St " | |
1943 | "Inode Path\n"); | |
1944 | else { | |
1945 | struct sock *s = v; | |
1946 | struct unix_sock *u = unix_sk(s); | |
1947 | unix_state_rlock(s); | |
1948 | ||
1949 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", | |
1950 | s, | |
1951 | atomic_read(&s->sk_refcnt), | |
1952 | 0, | |
1953 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
1954 | s->sk_type, | |
1955 | s->sk_socket ? | |
1956 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
1957 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
1958 | sock_i_ino(s)); | |
1959 | ||
1960 | if (u->addr) { | |
1961 | int i, len; | |
1962 | seq_putc(seq, ' '); | |
1963 | ||
1964 | i = 0; | |
1965 | len = u->addr->len - sizeof(short); | |
1966 | if (!UNIX_ABSTRACT(s)) | |
1967 | len--; | |
1968 | else { | |
1969 | seq_putc(seq, '@'); | |
1970 | i++; | |
1971 | } | |
1972 | for ( ; i < len; i++) | |
1973 | seq_putc(seq, u->addr->name->sun_path[i]); | |
1974 | } | |
1975 | unix_state_runlock(s); | |
1976 | seq_putc(seq, '\n'); | |
1977 | } | |
1978 | ||
1979 | return 0; | |
1980 | } | |
1981 | ||
1982 | static struct seq_operations unix_seq_ops = { | |
1983 | .start = unix_seq_start, | |
1984 | .next = unix_seq_next, | |
1985 | .stop = unix_seq_stop, | |
1986 | .show = unix_seq_show, | |
1987 | }; | |
1988 | ||
1989 | ||
1990 | static int unix_seq_open(struct inode *inode, struct file *file) | |
1991 | { | |
1992 | struct seq_file *seq; | |
1993 | int rc = -ENOMEM; | |
1994 | int *iter = kmalloc(sizeof(int), GFP_KERNEL); | |
1995 | ||
1996 | if (!iter) | |
1997 | goto out; | |
1998 | ||
1999 | rc = seq_open(file, &unix_seq_ops); | |
2000 | if (rc) | |
2001 | goto out_kfree; | |
2002 | ||
2003 | seq = file->private_data; | |
2004 | seq->private = iter; | |
2005 | *iter = 0; | |
2006 | out: | |
2007 | return rc; | |
2008 | out_kfree: | |
2009 | kfree(iter); | |
2010 | goto out; | |
2011 | } | |
2012 | ||
2013 | static struct file_operations unix_seq_fops = { | |
2014 | .owner = THIS_MODULE, | |
2015 | .open = unix_seq_open, | |
2016 | .read = seq_read, | |
2017 | .llseek = seq_lseek, | |
2018 | .release = seq_release_private, | |
2019 | }; | |
2020 | ||
2021 | #endif | |
2022 | ||
2023 | static struct net_proto_family unix_family_ops = { | |
2024 | .family = PF_UNIX, | |
2025 | .create = unix_create, | |
2026 | .owner = THIS_MODULE, | |
2027 | }; | |
2028 | ||
2029 | #ifdef CONFIG_SYSCTL | |
2030 | extern void unix_sysctl_register(void); | |
2031 | extern void unix_sysctl_unregister(void); | |
2032 | #else | |
2033 | static inline void unix_sysctl_register(void) {} | |
2034 | static inline void unix_sysctl_unregister(void) {} | |
2035 | #endif | |
2036 | ||
2037 | static int __init af_unix_init(void) | |
2038 | { | |
2039 | int rc = -1; | |
2040 | struct sk_buff *dummy_skb; | |
2041 | ||
2042 | if (sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)) { | |
2043 | printk(KERN_CRIT "%s: panic\n", __FUNCTION__); | |
2044 | goto out; | |
2045 | } | |
2046 | ||
2047 | rc = proto_register(&unix_proto, 1); | |
2048 | if (rc != 0) { | |
2049 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", | |
2050 | __FUNCTION__); | |
2051 | goto out; | |
2052 | } | |
2053 | ||
2054 | sock_register(&unix_family_ops); | |
2055 | #ifdef CONFIG_PROC_FS | |
2056 | proc_net_fops_create("unix", 0, &unix_seq_fops); | |
2057 | #endif | |
2058 | unix_sysctl_register(); | |
2059 | out: | |
2060 | return rc; | |
2061 | } | |
2062 | ||
2063 | static void __exit af_unix_exit(void) | |
2064 | { | |
2065 | sock_unregister(PF_UNIX); | |
2066 | unix_sysctl_unregister(); | |
2067 | proc_net_remove("unix"); | |
2068 | proto_unregister(&unix_proto); | |
2069 | } | |
2070 | ||
2071 | module_init(af_unix_init); | |
2072 | module_exit(af_unix_exit); | |
2073 | ||
2074 | MODULE_LICENSE("GPL"); | |
2075 | MODULE_ALIAS_NETPROTO(PF_UNIX); |