]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * NET4: Implementation of BSD Unix domain sockets. | |
3 | * | |
113aa838 | 4 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | * | |
1da177e4 LT |
11 | * Fixes: |
12 | * Linus Torvalds : Assorted bug cures. | |
13 | * Niibe Yutaka : async I/O support. | |
14 | * Carsten Paeth : PF_UNIX check, address fixes. | |
15 | * Alan Cox : Limit size of allocated blocks. | |
16 | * Alan Cox : Fixed the stupid socketpair bug. | |
17 | * Alan Cox : BSD compatibility fine tuning. | |
18 | * Alan Cox : Fixed a bug in connect when interrupted. | |
19 | * Alan Cox : Sorted out a proper draft version of | |
20 | * file descriptor passing hacked up from | |
21 | * Mike Shaver's work. | |
22 | * Marty Leisner : Fixes to fd passing | |
23 | * Nick Nevin : recvmsg bugfix. | |
24 | * Alan Cox : Started proper garbage collector | |
25 | * Heiko EiBfeldt : Missing verify_area check | |
26 | * Alan Cox : Started POSIXisms | |
27 | * Andreas Schwab : Replace inode by dentry for proper | |
28 | * reference counting | |
29 | * Kirk Petersen : Made this a module | |
30 | * Christoph Rohland : Elegant non-blocking accept/connect algorithm. | |
31 | * Lots of bug fixes. | |
32 | * Alexey Kuznetosv : Repaired (I hope) bugs introduces | |
33 | * by above two patches. | |
34 | * Andrea Arcangeli : If possible we block in connect(2) | |
35 | * if the max backlog of the listen socket | |
36 | * is been reached. This won't break | |
37 | * old apps and it will avoid huge amount | |
38 | * of socks hashed (this for unix_gc() | |
39 | * performances reasons). | |
40 | * Security fix that limits the max | |
41 | * number of socks to 2*max_files and | |
42 | * the number of skb queueable in the | |
43 | * dgram receiver. | |
44 | * Artur Skawina : Hash function optimizations | |
45 | * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8) | |
46 | * Malcolm Beattie : Set peercred for socketpair | |
47 | * Michal Ostrowski : Module initialization cleanup. | |
48 | * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT, | |
49 | * the core infrastructure is doing that | |
50 | * for all net proto families now (2.5.69+) | |
51 | * | |
52 | * | |
53 | * Known differences from reference BSD that was tested: | |
54 | * | |
55 | * [TO FIX] | |
56 | * ECONNREFUSED is not returned from one end of a connected() socket to the | |
57 | * other the moment one end closes. | |
58 | * fstat() doesn't return st_dev=0, and give the blksize as high water mark | |
59 | * and a fake inode identifier (nor the BSD first socket fstat twice bug). | |
60 | * [NOT TO FIX] | |
61 | * accept() returns a path name even if the connecting socket has closed | |
62 | * in the meantime (BSD loses the path and gives up). | |
63 | * accept() returns 0 length path for an unbound connector. BSD returns 16 | |
64 | * and a null first byte in the path (but not for gethost/peername - BSD bug ??) | |
65 | * socketpair(...SOCK_RAW..) doesn't panic the kernel. | |
66 | * BSD af_unix apparently has connect forgetting to block properly. | |
67 | * (need to check this with the POSIX spec in detail) | |
68 | * | |
69 | * Differences from 2.0.0-11-... (ANK) | |
70 | * Bug fixes and improvements. | |
71 | * - client shutdown killed server socket. | |
72 | * - removed all useless cli/sti pairs. | |
73 | * | |
74 | * Semantic changes/extensions. | |
75 | * - generic control message passing. | |
76 | * - SCM_CREDENTIALS control message. | |
77 | * - "Abstract" (not FS based) socket bindings. | |
78 | * Abstract names are sequences of bytes (not zero terminated) | |
79 | * started by 0, so that this name space does not intersect | |
80 | * with BSD names. | |
81 | */ | |
82 | ||
5cc208be | 83 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
84 | ||
1da177e4 | 85 | #include <linux/module.h> |
1da177e4 | 86 | #include <linux/kernel.h> |
1da177e4 LT |
87 | #include <linux/signal.h> |
88 | #include <linux/sched.h> | |
89 | #include <linux/errno.h> | |
90 | #include <linux/string.h> | |
91 | #include <linux/stat.h> | |
92 | #include <linux/dcache.h> | |
93 | #include <linux/namei.h> | |
94 | #include <linux/socket.h> | |
95 | #include <linux/un.h> | |
96 | #include <linux/fcntl.h> | |
97 | #include <linux/termios.h> | |
98 | #include <linux/sockios.h> | |
99 | #include <linux/net.h> | |
100 | #include <linux/in.h> | |
101 | #include <linux/fs.h> | |
102 | #include <linux/slab.h> | |
103 | #include <asm/uaccess.h> | |
104 | #include <linux/skbuff.h> | |
105 | #include <linux/netdevice.h> | |
457c4cbc | 106 | #include <net/net_namespace.h> |
1da177e4 | 107 | #include <net/sock.h> |
c752f073 | 108 | #include <net/tcp_states.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
115 | #include <linux/rtnetlink.h> |
116 | #include <linux/mount.h> | |
117 | #include <net/checksum.h> | |
118 | #include <linux/security.h> | |
2b15af6f | 119 | #include <linux/freezer.h> |
1da177e4 | 120 | |
7123aaa3 | 121 | struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; |
fa7ff56f PE |
122 | EXPORT_SYMBOL_GPL(unix_socket_table); |
123 | DEFINE_SPINLOCK(unix_table_lock); | |
124 | EXPORT_SYMBOL_GPL(unix_table_lock); | |
518de9b3 | 125 | static atomic_long_t unix_nr_socks; |
1da177e4 | 126 | |
1da177e4 | 127 | |
7123aaa3 ED |
128 | static struct hlist_head *unix_sockets_unbound(void *addr) |
129 | { | |
130 | unsigned long hash = (unsigned long)addr; | |
131 | ||
132 | hash ^= hash >> 16; | |
133 | hash ^= hash >> 8; | |
134 | hash %= UNIX_HASH_SIZE; | |
135 | return &unix_socket_table[UNIX_HASH_SIZE + hash]; | |
136 | } | |
137 | ||
138 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash < UNIX_HASH_SIZE) | |
1da177e4 | 139 | |
877ce7c1 | 140 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 141 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 | 142 | { |
37a9a8df | 143 | UNIXCB(skb).secid = scm->secid; |
877ce7c1 CZ |
144 | } |
145 | ||
146 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
147 | { | |
37a9a8df SS |
148 | scm->secid = UNIXCB(skb).secid; |
149 | } | |
150 | ||
151 | static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb) | |
152 | { | |
153 | return (scm->secid == UNIXCB(skb).secid); | |
877ce7c1 CZ |
154 | } |
155 | #else | |
dc49c1f9 | 156 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
877ce7c1 CZ |
157 | { } |
158 | ||
159 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) | |
160 | { } | |
37a9a8df SS |
161 | |
162 | static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb) | |
163 | { | |
164 | return true; | |
165 | } | |
877ce7c1 CZ |
166 | #endif /* CONFIG_SECURITY_NETWORK */ |
167 | ||
1da177e4 LT |
168 | /* |
169 | * SMP locking strategy: | |
fbe9cc4a | 170 | * hash table is protected with spinlock unix_table_lock |
663717f6 | 171 | * each socket state is protected by separate spin lock. |
1da177e4 LT |
172 | */ |
173 | ||
95c96174 | 174 | static inline unsigned int unix_hash_fold(__wsum n) |
1da177e4 | 175 | { |
0a13404d | 176 | unsigned int hash = (__force unsigned int)csum_fold(n); |
95c96174 | 177 | |
1da177e4 LT |
178 | hash ^= hash>>8; |
179 | return hash&(UNIX_HASH_SIZE-1); | |
180 | } | |
181 | ||
182 | #define unix_peer(sk) (unix_sk(sk)->peer) | |
183 | ||
184 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) | |
185 | { | |
186 | return unix_peer(osk) == sk; | |
187 | } | |
188 | ||
189 | static inline int unix_may_send(struct sock *sk, struct sock *osk) | |
190 | { | |
6eba6a37 | 191 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
1da177e4 LT |
192 | } |
193 | ||
3c73419c RW |
194 | static inline int unix_recvq_full(struct sock const *sk) |
195 | { | |
196 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; | |
197 | } | |
198 | ||
fa7ff56f | 199 | struct sock *unix_peer_get(struct sock *s) |
1da177e4 LT |
200 | { |
201 | struct sock *peer; | |
202 | ||
1c92b4e5 | 203 | unix_state_lock(s); |
1da177e4 LT |
204 | peer = unix_peer(s); |
205 | if (peer) | |
206 | sock_hold(peer); | |
1c92b4e5 | 207 | unix_state_unlock(s); |
1da177e4 LT |
208 | return peer; |
209 | } | |
fa7ff56f | 210 | EXPORT_SYMBOL_GPL(unix_peer_get); |
1da177e4 LT |
211 | |
212 | static inline void unix_release_addr(struct unix_address *addr) | |
213 | { | |
214 | if (atomic_dec_and_test(&addr->refcnt)) | |
215 | kfree(addr); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Check unix socket name: | |
220 | * - should be not zero length. | |
221 | * - if started by not zero, should be NULL terminated (FS object) | |
222 | * - if started by zero, it is abstract name. | |
223 | */ | |
ac7bfa62 | 224 | |
95c96174 | 225 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned int *hashp) |
1da177e4 LT |
226 | { |
227 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) | |
228 | return -EINVAL; | |
229 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) | |
230 | return -EINVAL; | |
231 | if (sunaddr->sun_path[0]) { | |
232 | /* | |
233 | * This may look like an off by one error but it is a bit more | |
234 | * subtle. 108 is the longest valid AF_UNIX path for a binding. | |
25985edc | 235 | * sun_path[108] doesn't as such exist. However in kernel space |
1da177e4 LT |
236 | * we are guaranteed that it is a valid memory location in our |
237 | * kernel address buffer. | |
238 | */ | |
e27dfcea | 239 | ((char *)sunaddr)[len] = 0; |
1da177e4 LT |
240 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
241 | return len; | |
242 | } | |
243 | ||
07f0757a | 244 | *hashp = unix_hash_fold(csum_partial(sunaddr, len, 0)); |
1da177e4 LT |
245 | return len; |
246 | } | |
247 | ||
248 | static void __unix_remove_socket(struct sock *sk) | |
249 | { | |
250 | sk_del_node_init(sk); | |
251 | } | |
252 | ||
253 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
254 | { | |
547b792c | 255 | WARN_ON(!sk_unhashed(sk)); |
1da177e4 LT |
256 | sk_add_node(sk, list); |
257 | } | |
258 | ||
259 | static inline void unix_remove_socket(struct sock *sk) | |
260 | { | |
fbe9cc4a | 261 | spin_lock(&unix_table_lock); |
1da177e4 | 262 | __unix_remove_socket(sk); |
fbe9cc4a | 263 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
264 | } |
265 | ||
266 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) | |
267 | { | |
fbe9cc4a | 268 | spin_lock(&unix_table_lock); |
1da177e4 | 269 | __unix_insert_socket(list, sk); |
fbe9cc4a | 270 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
271 | } |
272 | ||
097e66c5 DL |
273 | static struct sock *__unix_find_socket_byname(struct net *net, |
274 | struct sockaddr_un *sunname, | |
95c96174 | 275 | int len, int type, unsigned int hash) |
1da177e4 LT |
276 | { |
277 | struct sock *s; | |
1da177e4 | 278 | |
b67bfe0d | 279 | sk_for_each(s, &unix_socket_table[hash ^ type]) { |
1da177e4 LT |
280 | struct unix_sock *u = unix_sk(s); |
281 | ||
878628fb | 282 | if (!net_eq(sock_net(s), net)) |
097e66c5 DL |
283 | continue; |
284 | ||
1da177e4 LT |
285 | if (u->addr->len == len && |
286 | !memcmp(u->addr->name, sunname, len)) | |
287 | goto found; | |
288 | } | |
289 | s = NULL; | |
290 | found: | |
291 | return s; | |
292 | } | |
293 | ||
097e66c5 DL |
294 | static inline struct sock *unix_find_socket_byname(struct net *net, |
295 | struct sockaddr_un *sunname, | |
1da177e4 | 296 | int len, int type, |
95c96174 | 297 | unsigned int hash) |
1da177e4 LT |
298 | { |
299 | struct sock *s; | |
300 | ||
fbe9cc4a | 301 | spin_lock(&unix_table_lock); |
097e66c5 | 302 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
303 | if (s) |
304 | sock_hold(s); | |
fbe9cc4a | 305 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
306 | return s; |
307 | } | |
308 | ||
6616f788 | 309 | static struct sock *unix_find_socket_byinode(struct inode *i) |
1da177e4 LT |
310 | { |
311 | struct sock *s; | |
1da177e4 | 312 | |
fbe9cc4a | 313 | spin_lock(&unix_table_lock); |
b67bfe0d | 314 | sk_for_each(s, |
1da177e4 | 315 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { |
40ffe67d | 316 | struct dentry *dentry = unix_sk(s)->path.dentry; |
1da177e4 | 317 | |
a25b376b | 318 | if (dentry && d_backing_inode(dentry) == i) { |
1da177e4 LT |
319 | sock_hold(s); |
320 | goto found; | |
321 | } | |
322 | } | |
323 | s = NULL; | |
324 | found: | |
fbe9cc4a | 325 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
326 | return s; |
327 | } | |
328 | ||
329 | static inline int unix_writable(struct sock *sk) | |
330 | { | |
331 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; | |
332 | } | |
333 | ||
334 | static void unix_write_space(struct sock *sk) | |
335 | { | |
43815482 ED |
336 | struct socket_wq *wq; |
337 | ||
338 | rcu_read_lock(); | |
1da177e4 | 339 | if (unix_writable(sk)) { |
43815482 ED |
340 | wq = rcu_dereference(sk->sk_wq); |
341 | if (wq_has_sleeper(wq)) | |
67426b75 ED |
342 | wake_up_interruptible_sync_poll(&wq->wait, |
343 | POLLOUT | POLLWRNORM | POLLWRBAND); | |
8d8ad9d7 | 344 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 | 345 | } |
43815482 | 346 | rcu_read_unlock(); |
1da177e4 LT |
347 | } |
348 | ||
349 | /* When dgram socket disconnects (or changes its peer), we clear its receive | |
350 | * queue of packets arrived from previous peer. First, it allows to do | |
351 | * flow control based only on wmem_alloc; second, sk connected to peer | |
352 | * may receive messages only from that peer. */ | |
353 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) | |
354 | { | |
b03efcfb | 355 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
1da177e4 LT |
356 | skb_queue_purge(&sk->sk_receive_queue); |
357 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); | |
358 | ||
359 | /* If one link of bidirectional dgram pipe is disconnected, | |
360 | * we signal error. Messages are lost. Do not make this, | |
361 | * when peer was not connected to us. | |
362 | */ | |
363 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { | |
364 | other->sk_err = ECONNRESET; | |
365 | other->sk_error_report(other); | |
366 | } | |
367 | } | |
368 | } | |
369 | ||
370 | static void unix_sock_destructor(struct sock *sk) | |
371 | { | |
372 | struct unix_sock *u = unix_sk(sk); | |
373 | ||
374 | skb_queue_purge(&sk->sk_receive_queue); | |
375 | ||
547b792c IJ |
376 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
377 | WARN_ON(!sk_unhashed(sk)); | |
378 | WARN_ON(sk->sk_socket); | |
1da177e4 | 379 | if (!sock_flag(sk, SOCK_DEAD)) { |
5cc208be | 380 | pr_info("Attempt to release alive unix socket: %p\n", sk); |
1da177e4 LT |
381 | return; |
382 | } | |
383 | ||
384 | if (u->addr) | |
385 | unix_release_addr(u->addr); | |
386 | ||
518de9b3 | 387 | atomic_long_dec(&unix_nr_socks); |
6f756a8c | 388 | local_bh_disable(); |
a8076d8d | 389 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
6f756a8c | 390 | local_bh_enable(); |
1da177e4 | 391 | #ifdef UNIX_REFCNT_DEBUG |
5cc208be | 392 | pr_debug("UNIX %p is destroyed, %ld are still alive.\n", sk, |
518de9b3 | 393 | atomic_long_read(&unix_nr_socks)); |
1da177e4 LT |
394 | #endif |
395 | } | |
396 | ||
ded34e0f | 397 | static void unix_release_sock(struct sock *sk, int embrion) |
1da177e4 LT |
398 | { |
399 | struct unix_sock *u = unix_sk(sk); | |
40ffe67d | 400 | struct path path; |
1da177e4 LT |
401 | struct sock *skpair; |
402 | struct sk_buff *skb; | |
403 | int state; | |
404 | ||
405 | unix_remove_socket(sk); | |
406 | ||
407 | /* Clear state */ | |
1c92b4e5 | 408 | unix_state_lock(sk); |
1da177e4 LT |
409 | sock_orphan(sk); |
410 | sk->sk_shutdown = SHUTDOWN_MASK; | |
40ffe67d AV |
411 | path = u->path; |
412 | u->path.dentry = NULL; | |
413 | u->path.mnt = NULL; | |
1da177e4 LT |
414 | state = sk->sk_state; |
415 | sk->sk_state = TCP_CLOSE; | |
1c92b4e5 | 416 | unix_state_unlock(sk); |
1da177e4 LT |
417 | |
418 | wake_up_interruptible_all(&u->peer_wait); | |
419 | ||
e27dfcea | 420 | skpair = unix_peer(sk); |
1da177e4 | 421 | |
e27dfcea | 422 | if (skpair != NULL) { |
1da177e4 | 423 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
1c92b4e5 | 424 | unix_state_lock(skpair); |
1da177e4 LT |
425 | /* No more writes */ |
426 | skpair->sk_shutdown = SHUTDOWN_MASK; | |
427 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) | |
428 | skpair->sk_err = ECONNRESET; | |
1c92b4e5 | 429 | unix_state_unlock(skpair); |
1da177e4 | 430 | skpair->sk_state_change(skpair); |
8d8ad9d7 | 431 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
1da177e4 LT |
432 | } |
433 | sock_put(skpair); /* It may now die */ | |
434 | unix_peer(sk) = NULL; | |
435 | } | |
436 | ||
437 | /* Try to flush out this socket. Throw out buffers at least */ | |
438 | ||
439 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
e27dfcea | 440 | if (state == TCP_LISTEN) |
1da177e4 LT |
441 | unix_release_sock(skb->sk, 1); |
442 | /* passed fds are erased in the kfree_skb hook */ | |
443 | kfree_skb(skb); | |
444 | } | |
445 | ||
40ffe67d AV |
446 | if (path.dentry) |
447 | path_put(&path); | |
1da177e4 LT |
448 | |
449 | sock_put(sk); | |
450 | ||
451 | /* ---- Socket is dead now and most probably destroyed ---- */ | |
452 | ||
453 | /* | |
e04dae84 | 454 | * Fixme: BSD difference: In BSD all sockets connected to us get |
1da177e4 LT |
455 | * ECONNRESET and we die on the spot. In Linux we behave |
456 | * like files and pipes do and wait for the last | |
457 | * dereference. | |
458 | * | |
459 | * Can't we simply set sock->err? | |
460 | * | |
461 | * What the above comment does talk about? --ANK(980817) | |
462 | */ | |
463 | ||
9305cfa4 | 464 | if (unix_tot_inflight) |
ac7bfa62 | 465 | unix_gc(); /* Garbage collect fds */ |
1da177e4 LT |
466 | } |
467 | ||
109f6e39 EB |
468 | static void init_peercred(struct sock *sk) |
469 | { | |
470 | put_pid(sk->sk_peer_pid); | |
471 | if (sk->sk_peer_cred) | |
472 | put_cred(sk->sk_peer_cred); | |
473 | sk->sk_peer_pid = get_pid(task_tgid(current)); | |
474 | sk->sk_peer_cred = get_current_cred(); | |
475 | } | |
476 | ||
477 | static void copy_peercred(struct sock *sk, struct sock *peersk) | |
478 | { | |
479 | put_pid(sk->sk_peer_pid); | |
480 | if (sk->sk_peer_cred) | |
481 | put_cred(sk->sk_peer_cred); | |
482 | sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); | |
483 | sk->sk_peer_cred = get_cred(peersk->sk_peer_cred); | |
484 | } | |
485 | ||
1da177e4 LT |
486 | static int unix_listen(struct socket *sock, int backlog) |
487 | { | |
488 | int err; | |
489 | struct sock *sk = sock->sk; | |
490 | struct unix_sock *u = unix_sk(sk); | |
109f6e39 | 491 | struct pid *old_pid = NULL; |
1da177e4 LT |
492 | |
493 | err = -EOPNOTSUPP; | |
6eba6a37 ED |
494 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
495 | goto out; /* Only stream/seqpacket sockets accept */ | |
1da177e4 LT |
496 | err = -EINVAL; |
497 | if (!u->addr) | |
6eba6a37 | 498 | goto out; /* No listens on an unbound socket */ |
1c92b4e5 | 499 | unix_state_lock(sk); |
1da177e4 LT |
500 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
501 | goto out_unlock; | |
502 | if (backlog > sk->sk_max_ack_backlog) | |
503 | wake_up_interruptible_all(&u->peer_wait); | |
504 | sk->sk_max_ack_backlog = backlog; | |
505 | sk->sk_state = TCP_LISTEN; | |
506 | /* set credentials so connect can copy them */ | |
109f6e39 | 507 | init_peercred(sk); |
1da177e4 LT |
508 | err = 0; |
509 | ||
510 | out_unlock: | |
1c92b4e5 | 511 | unix_state_unlock(sk); |
109f6e39 | 512 | put_pid(old_pid); |
1da177e4 LT |
513 | out: |
514 | return err; | |
515 | } | |
516 | ||
517 | static int unix_release(struct socket *); | |
518 | static int unix_bind(struct socket *, struct sockaddr *, int); | |
519 | static int unix_stream_connect(struct socket *, struct sockaddr *, | |
520 | int addr_len, int flags); | |
521 | static int unix_socketpair(struct socket *, struct socket *); | |
522 | static int unix_accept(struct socket *, struct socket *, int); | |
523 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); | |
524 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); | |
ec0d215f RW |
525 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
526 | poll_table *); | |
1da177e4 LT |
527 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
528 | static int unix_shutdown(struct socket *, int); | |
1b784140 YX |
529 | static int unix_stream_sendmsg(struct socket *, struct msghdr *, size_t); |
530 | static int unix_stream_recvmsg(struct socket *, struct msghdr *, size_t, int); | |
869e7c62 HFS |
531 | static ssize_t unix_stream_sendpage(struct socket *, struct page *, int offset, |
532 | size_t size, int flags); | |
2b514574 HFS |
533 | static ssize_t unix_stream_splice_read(struct socket *, loff_t *ppos, |
534 | struct pipe_inode_info *, size_t size, | |
535 | unsigned int flags); | |
1b784140 YX |
536 | static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t); |
537 | static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int); | |
1da177e4 LT |
538 | static int unix_dgram_connect(struct socket *, struct sockaddr *, |
539 | int, int); | |
1b784140 YX |
540 | static int unix_seqpacket_sendmsg(struct socket *, struct msghdr *, size_t); |
541 | static int unix_seqpacket_recvmsg(struct socket *, struct msghdr *, size_t, | |
542 | int); | |
1da177e4 | 543 | |
12663bfc | 544 | static int unix_set_peek_off(struct sock *sk, int val) |
f55bb7f9 PE |
545 | { |
546 | struct unix_sock *u = unix_sk(sk); | |
547 | ||
12663bfc SL |
548 | if (mutex_lock_interruptible(&u->readlock)) |
549 | return -EINTR; | |
550 | ||
f55bb7f9 PE |
551 | sk->sk_peek_off = val; |
552 | mutex_unlock(&u->readlock); | |
12663bfc SL |
553 | |
554 | return 0; | |
f55bb7f9 PE |
555 | } |
556 | ||
557 | ||
90ddc4f0 | 558 | static const struct proto_ops unix_stream_ops = { |
1da177e4 LT |
559 | .family = PF_UNIX, |
560 | .owner = THIS_MODULE, | |
561 | .release = unix_release, | |
562 | .bind = unix_bind, | |
563 | .connect = unix_stream_connect, | |
564 | .socketpair = unix_socketpair, | |
565 | .accept = unix_accept, | |
566 | .getname = unix_getname, | |
567 | .poll = unix_poll, | |
568 | .ioctl = unix_ioctl, | |
569 | .listen = unix_listen, | |
570 | .shutdown = unix_shutdown, | |
571 | .setsockopt = sock_no_setsockopt, | |
572 | .getsockopt = sock_no_getsockopt, | |
573 | .sendmsg = unix_stream_sendmsg, | |
574 | .recvmsg = unix_stream_recvmsg, | |
575 | .mmap = sock_no_mmap, | |
869e7c62 | 576 | .sendpage = unix_stream_sendpage, |
2b514574 | 577 | .splice_read = unix_stream_splice_read, |
fc0d7536 | 578 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
579 | }; |
580 | ||
90ddc4f0 | 581 | static const struct proto_ops unix_dgram_ops = { |
1da177e4 LT |
582 | .family = PF_UNIX, |
583 | .owner = THIS_MODULE, | |
584 | .release = unix_release, | |
585 | .bind = unix_bind, | |
586 | .connect = unix_dgram_connect, | |
587 | .socketpair = unix_socketpair, | |
588 | .accept = sock_no_accept, | |
589 | .getname = unix_getname, | |
ec0d215f | 590 | .poll = unix_dgram_poll, |
1da177e4 LT |
591 | .ioctl = unix_ioctl, |
592 | .listen = sock_no_listen, | |
593 | .shutdown = unix_shutdown, | |
594 | .setsockopt = sock_no_setsockopt, | |
595 | .getsockopt = sock_no_getsockopt, | |
596 | .sendmsg = unix_dgram_sendmsg, | |
597 | .recvmsg = unix_dgram_recvmsg, | |
598 | .mmap = sock_no_mmap, | |
599 | .sendpage = sock_no_sendpage, | |
f55bb7f9 | 600 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
601 | }; |
602 | ||
90ddc4f0 | 603 | static const struct proto_ops unix_seqpacket_ops = { |
1da177e4 LT |
604 | .family = PF_UNIX, |
605 | .owner = THIS_MODULE, | |
606 | .release = unix_release, | |
607 | .bind = unix_bind, | |
608 | .connect = unix_stream_connect, | |
609 | .socketpair = unix_socketpair, | |
610 | .accept = unix_accept, | |
611 | .getname = unix_getname, | |
ec0d215f | 612 | .poll = unix_dgram_poll, |
1da177e4 LT |
613 | .ioctl = unix_ioctl, |
614 | .listen = unix_listen, | |
615 | .shutdown = unix_shutdown, | |
616 | .setsockopt = sock_no_setsockopt, | |
617 | .getsockopt = sock_no_getsockopt, | |
618 | .sendmsg = unix_seqpacket_sendmsg, | |
a05d2ad1 | 619 | .recvmsg = unix_seqpacket_recvmsg, |
1da177e4 LT |
620 | .mmap = sock_no_mmap, |
621 | .sendpage = sock_no_sendpage, | |
f55bb7f9 | 622 | .set_peek_off = unix_set_peek_off, |
1da177e4 LT |
623 | }; |
624 | ||
625 | static struct proto unix_proto = { | |
248969ae ED |
626 | .name = "UNIX", |
627 | .owner = THIS_MODULE, | |
248969ae | 628 | .obj_size = sizeof(struct unix_sock), |
1da177e4 LT |
629 | }; |
630 | ||
a09785a2 IM |
631 | /* |
632 | * AF_UNIX sockets do not interact with hardware, hence they | |
633 | * dont trigger interrupts - so it's safe for them to have | |
634 | * bh-unsafe locking for their sk_receive_queue.lock. Split off | |
635 | * this special lock-class by reinitializing the spinlock key: | |
636 | */ | |
637 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; | |
638 | ||
11aa9c28 | 639 | static struct sock *unix_create1(struct net *net, struct socket *sock, int kern) |
1da177e4 LT |
640 | { |
641 | struct sock *sk = NULL; | |
642 | struct unix_sock *u; | |
643 | ||
518de9b3 ED |
644 | atomic_long_inc(&unix_nr_socks); |
645 | if (atomic_long_read(&unix_nr_socks) > 2 * get_max_files()) | |
1da177e4 LT |
646 | goto out; |
647 | ||
11aa9c28 | 648 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto, kern); |
1da177e4 LT |
649 | if (!sk) |
650 | goto out; | |
651 | ||
6eba6a37 | 652 | sock_init_data(sock, sk); |
a09785a2 IM |
653 | lockdep_set_class(&sk->sk_receive_queue.lock, |
654 | &af_unix_sk_receive_queue_lock_key); | |
1da177e4 LT |
655 | |
656 | sk->sk_write_space = unix_write_space; | |
a0a53c8b | 657 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
1da177e4 LT |
658 | sk->sk_destruct = unix_sock_destructor; |
659 | u = unix_sk(sk); | |
40ffe67d AV |
660 | u->path.dentry = NULL; |
661 | u->path.mnt = NULL; | |
fd19f329 | 662 | spin_lock_init(&u->lock); |
516e0cc5 | 663 | atomic_long_set(&u->inflight, 0); |
1fd05ba5 | 664 | INIT_LIST_HEAD(&u->link); |
57b47a53 | 665 | mutex_init(&u->readlock); /* single task reading lock */ |
1da177e4 | 666 | init_waitqueue_head(&u->peer_wait); |
7123aaa3 | 667 | unix_insert_socket(unix_sockets_unbound(sk), sk); |
1da177e4 | 668 | out: |
284b327b | 669 | if (sk == NULL) |
518de9b3 | 670 | atomic_long_dec(&unix_nr_socks); |
920de804 ED |
671 | else { |
672 | local_bh_disable(); | |
a8076d8d | 673 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
920de804 ED |
674 | local_bh_enable(); |
675 | } | |
1da177e4 LT |
676 | return sk; |
677 | } | |
678 | ||
3f378b68 EP |
679 | static int unix_create(struct net *net, struct socket *sock, int protocol, |
680 | int kern) | |
1da177e4 LT |
681 | { |
682 | if (protocol && protocol != PF_UNIX) | |
683 | return -EPROTONOSUPPORT; | |
684 | ||
685 | sock->state = SS_UNCONNECTED; | |
686 | ||
687 | switch (sock->type) { | |
688 | case SOCK_STREAM: | |
689 | sock->ops = &unix_stream_ops; | |
690 | break; | |
691 | /* | |
692 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though | |
693 | * nothing uses it. | |
694 | */ | |
695 | case SOCK_RAW: | |
e27dfcea | 696 | sock->type = SOCK_DGRAM; |
1da177e4 LT |
697 | case SOCK_DGRAM: |
698 | sock->ops = &unix_dgram_ops; | |
699 | break; | |
700 | case SOCK_SEQPACKET: | |
701 | sock->ops = &unix_seqpacket_ops; | |
702 | break; | |
703 | default: | |
704 | return -ESOCKTNOSUPPORT; | |
705 | } | |
706 | ||
11aa9c28 | 707 | return unix_create1(net, sock, kern) ? 0 : -ENOMEM; |
1da177e4 LT |
708 | } |
709 | ||
710 | static int unix_release(struct socket *sock) | |
711 | { | |
712 | struct sock *sk = sock->sk; | |
713 | ||
714 | if (!sk) | |
715 | return 0; | |
716 | ||
ded34e0f | 717 | unix_release_sock(sk, 0); |
1da177e4 LT |
718 | sock->sk = NULL; |
719 | ||
ded34e0f | 720 | return 0; |
1da177e4 LT |
721 | } |
722 | ||
723 | static int unix_autobind(struct socket *sock) | |
724 | { | |
725 | struct sock *sk = sock->sk; | |
3b1e0a65 | 726 | struct net *net = sock_net(sk); |
1da177e4 LT |
727 | struct unix_sock *u = unix_sk(sk); |
728 | static u32 ordernum = 1; | |
6eba6a37 | 729 | struct unix_address *addr; |
1da177e4 | 730 | int err; |
8df73ff9 | 731 | unsigned int retries = 0; |
1da177e4 | 732 | |
37ab4fa7 SL |
733 | err = mutex_lock_interruptible(&u->readlock); |
734 | if (err) | |
735 | return err; | |
1da177e4 LT |
736 | |
737 | err = 0; | |
738 | if (u->addr) | |
739 | goto out; | |
740 | ||
741 | err = -ENOMEM; | |
0da974f4 | 742 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
1da177e4 LT |
743 | if (!addr) |
744 | goto out; | |
745 | ||
1da177e4 LT |
746 | addr->name->sun_family = AF_UNIX; |
747 | atomic_set(&addr->refcnt, 1); | |
748 | ||
749 | retry: | |
750 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); | |
07f0757a | 751 | addr->hash = unix_hash_fold(csum_partial(addr->name, addr->len, 0)); |
1da177e4 | 752 | |
fbe9cc4a | 753 | spin_lock(&unix_table_lock); |
1da177e4 LT |
754 | ordernum = (ordernum+1)&0xFFFFF; |
755 | ||
097e66c5 | 756 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
1da177e4 | 757 | addr->hash)) { |
fbe9cc4a | 758 | spin_unlock(&unix_table_lock); |
8df73ff9 TH |
759 | /* |
760 | * __unix_find_socket_byname() may take long time if many names | |
761 | * are already in use. | |
762 | */ | |
763 | cond_resched(); | |
764 | /* Give up if all names seems to be in use. */ | |
765 | if (retries++ == 0xFFFFF) { | |
766 | err = -ENOSPC; | |
767 | kfree(addr); | |
768 | goto out; | |
769 | } | |
1da177e4 LT |
770 | goto retry; |
771 | } | |
772 | addr->hash ^= sk->sk_type; | |
773 | ||
774 | __unix_remove_socket(sk); | |
775 | u->addr = addr; | |
776 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); | |
fbe9cc4a | 777 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
778 | err = 0; |
779 | ||
57b47a53 | 780 | out: mutex_unlock(&u->readlock); |
1da177e4 LT |
781 | return err; |
782 | } | |
783 | ||
097e66c5 DL |
784 | static struct sock *unix_find_other(struct net *net, |
785 | struct sockaddr_un *sunname, int len, | |
95c96174 | 786 | int type, unsigned int hash, int *error) |
1da177e4 LT |
787 | { |
788 | struct sock *u; | |
421748ec | 789 | struct path path; |
1da177e4 | 790 | int err = 0; |
ac7bfa62 | 791 | |
1da177e4 | 792 | if (sunname->sun_path[0]) { |
421748ec AV |
793 | struct inode *inode; |
794 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); | |
1da177e4 LT |
795 | if (err) |
796 | goto fail; | |
a25b376b | 797 | inode = d_backing_inode(path.dentry); |
421748ec | 798 | err = inode_permission(inode, MAY_WRITE); |
1da177e4 LT |
799 | if (err) |
800 | goto put_fail; | |
801 | ||
802 | err = -ECONNREFUSED; | |
421748ec | 803 | if (!S_ISSOCK(inode->i_mode)) |
1da177e4 | 804 | goto put_fail; |
6616f788 | 805 | u = unix_find_socket_byinode(inode); |
1da177e4 LT |
806 | if (!u) |
807 | goto put_fail; | |
808 | ||
809 | if (u->sk_type == type) | |
68ac1234 | 810 | touch_atime(&path); |
1da177e4 | 811 | |
421748ec | 812 | path_put(&path); |
1da177e4 | 813 | |
e27dfcea | 814 | err = -EPROTOTYPE; |
1da177e4 LT |
815 | if (u->sk_type != type) { |
816 | sock_put(u); | |
817 | goto fail; | |
818 | } | |
819 | } else { | |
820 | err = -ECONNREFUSED; | |
e27dfcea | 821 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
1da177e4 LT |
822 | if (u) { |
823 | struct dentry *dentry; | |
40ffe67d | 824 | dentry = unix_sk(u)->path.dentry; |
1da177e4 | 825 | if (dentry) |
68ac1234 | 826 | touch_atime(&unix_sk(u)->path); |
1da177e4 LT |
827 | } else |
828 | goto fail; | |
829 | } | |
830 | return u; | |
831 | ||
832 | put_fail: | |
421748ec | 833 | path_put(&path); |
1da177e4 | 834 | fail: |
e27dfcea | 835 | *error = err; |
1da177e4 LT |
836 | return NULL; |
837 | } | |
838 | ||
faf02010 AV |
839 | static int unix_mknod(const char *sun_path, umode_t mode, struct path *res) |
840 | { | |
841 | struct dentry *dentry; | |
842 | struct path path; | |
843 | int err = 0; | |
844 | /* | |
845 | * Get the parent directory, calculate the hash for last | |
846 | * component. | |
847 | */ | |
848 | dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0); | |
849 | err = PTR_ERR(dentry); | |
850 | if (IS_ERR(dentry)) | |
851 | return err; | |
852 | ||
853 | /* | |
854 | * All right, let's create it. | |
855 | */ | |
856 | err = security_path_mknod(&path, dentry, mode, 0); | |
857 | if (!err) { | |
ee8ac4d6 | 858 | err = vfs_mknod(d_inode(path.dentry), dentry, mode, 0); |
faf02010 AV |
859 | if (!err) { |
860 | res->mnt = mntget(path.mnt); | |
861 | res->dentry = dget(dentry); | |
862 | } | |
863 | } | |
864 | done_path_create(&path, dentry); | |
865 | return err; | |
866 | } | |
1da177e4 LT |
867 | |
868 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
869 | { | |
870 | struct sock *sk = sock->sk; | |
3b1e0a65 | 871 | struct net *net = sock_net(sk); |
1da177e4 | 872 | struct unix_sock *u = unix_sk(sk); |
e27dfcea | 873 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
dae6ad8f | 874 | char *sun_path = sunaddr->sun_path; |
1da177e4 | 875 | int err; |
95c96174 | 876 | unsigned int hash; |
1da177e4 LT |
877 | struct unix_address *addr; |
878 | struct hlist_head *list; | |
879 | ||
880 | err = -EINVAL; | |
881 | if (sunaddr->sun_family != AF_UNIX) | |
882 | goto out; | |
883 | ||
e27dfcea | 884 | if (addr_len == sizeof(short)) { |
1da177e4 LT |
885 | err = unix_autobind(sock); |
886 | goto out; | |
887 | } | |
888 | ||
889 | err = unix_mkname(sunaddr, addr_len, &hash); | |
890 | if (err < 0) | |
891 | goto out; | |
892 | addr_len = err; | |
893 | ||
37ab4fa7 SL |
894 | err = mutex_lock_interruptible(&u->readlock); |
895 | if (err) | |
896 | goto out; | |
1da177e4 LT |
897 | |
898 | err = -EINVAL; | |
899 | if (u->addr) | |
900 | goto out_up; | |
901 | ||
902 | err = -ENOMEM; | |
903 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); | |
904 | if (!addr) | |
905 | goto out_up; | |
906 | ||
907 | memcpy(addr->name, sunaddr, addr_len); | |
908 | addr->len = addr_len; | |
909 | addr->hash = hash ^ sk->sk_type; | |
910 | atomic_set(&addr->refcnt, 1); | |
911 | ||
dae6ad8f | 912 | if (sun_path[0]) { |
faf02010 AV |
913 | struct path path; |
914 | umode_t mode = S_IFSOCK | | |
ce3b0f8d | 915 | (SOCK_INODE(sock)->i_mode & ~current_umask()); |
faf02010 AV |
916 | err = unix_mknod(sun_path, mode, &path); |
917 | if (err) { | |
918 | if (err == -EEXIST) | |
919 | err = -EADDRINUSE; | |
920 | unix_release_addr(addr); | |
921 | goto out_up; | |
922 | } | |
1da177e4 | 923 | addr->hash = UNIX_HASH_SIZE; |
a25b376b | 924 | hash = d_backing_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE-1); |
faf02010 AV |
925 | spin_lock(&unix_table_lock); |
926 | u->path = path; | |
927 | list = &unix_socket_table[hash]; | |
928 | } else { | |
929 | spin_lock(&unix_table_lock); | |
1da177e4 | 930 | err = -EADDRINUSE; |
097e66c5 | 931 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
1da177e4 LT |
932 | sk->sk_type, hash)) { |
933 | unix_release_addr(addr); | |
934 | goto out_unlock; | |
935 | } | |
936 | ||
937 | list = &unix_socket_table[addr->hash]; | |
1da177e4 LT |
938 | } |
939 | ||
940 | err = 0; | |
941 | __unix_remove_socket(sk); | |
942 | u->addr = addr; | |
943 | __unix_insert_socket(list, sk); | |
944 | ||
945 | out_unlock: | |
fbe9cc4a | 946 | spin_unlock(&unix_table_lock); |
1da177e4 | 947 | out_up: |
57b47a53 | 948 | mutex_unlock(&u->readlock); |
1da177e4 LT |
949 | out: |
950 | return err; | |
1da177e4 LT |
951 | } |
952 | ||
278a3de5 DM |
953 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
954 | { | |
955 | if (unlikely(sk1 == sk2) || !sk2) { | |
956 | unix_state_lock(sk1); | |
957 | return; | |
958 | } | |
959 | if (sk1 < sk2) { | |
960 | unix_state_lock(sk1); | |
961 | unix_state_lock_nested(sk2); | |
962 | } else { | |
963 | unix_state_lock(sk2); | |
964 | unix_state_lock_nested(sk1); | |
965 | } | |
966 | } | |
967 | ||
968 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) | |
969 | { | |
970 | if (unlikely(sk1 == sk2) || !sk2) { | |
971 | unix_state_unlock(sk1); | |
972 | return; | |
973 | } | |
974 | unix_state_unlock(sk1); | |
975 | unix_state_unlock(sk2); | |
976 | } | |
977 | ||
1da177e4 LT |
978 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
979 | int alen, int flags) | |
980 | { | |
981 | struct sock *sk = sock->sk; | |
3b1e0a65 | 982 | struct net *net = sock_net(sk); |
e27dfcea | 983 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
1da177e4 | 984 | struct sock *other; |
95c96174 | 985 | unsigned int hash; |
1da177e4 LT |
986 | int err; |
987 | ||
988 | if (addr->sa_family != AF_UNSPEC) { | |
989 | err = unix_mkname(sunaddr, alen, &hash); | |
990 | if (err < 0) | |
991 | goto out; | |
992 | alen = err; | |
993 | ||
994 | if (test_bit(SOCK_PASSCRED, &sock->flags) && | |
995 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) | |
996 | goto out; | |
997 | ||
278a3de5 | 998 | restart: |
e27dfcea | 999 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
1da177e4 LT |
1000 | if (!other) |
1001 | goto out; | |
1002 | ||
278a3de5 DM |
1003 | unix_state_double_lock(sk, other); |
1004 | ||
1005 | /* Apparently VFS overslept socket death. Retry. */ | |
1006 | if (sock_flag(other, SOCK_DEAD)) { | |
1007 | unix_state_double_unlock(sk, other); | |
1008 | sock_put(other); | |
1009 | goto restart; | |
1010 | } | |
1da177e4 LT |
1011 | |
1012 | err = -EPERM; | |
1013 | if (!unix_may_send(sk, other)) | |
1014 | goto out_unlock; | |
1015 | ||
1016 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1017 | if (err) | |
1018 | goto out_unlock; | |
1019 | ||
1020 | } else { | |
1021 | /* | |
1022 | * 1003.1g breaking connected state with AF_UNSPEC | |
1023 | */ | |
1024 | other = NULL; | |
278a3de5 | 1025 | unix_state_double_lock(sk, other); |
1da177e4 LT |
1026 | } |
1027 | ||
1028 | /* | |
1029 | * If it was connected, reconnect. | |
1030 | */ | |
1031 | if (unix_peer(sk)) { | |
1032 | struct sock *old_peer = unix_peer(sk); | |
e27dfcea | 1033 | unix_peer(sk) = other; |
278a3de5 | 1034 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
1035 | |
1036 | if (other != old_peer) | |
1037 | unix_dgram_disconnected(sk, old_peer); | |
1038 | sock_put(old_peer); | |
1039 | } else { | |
e27dfcea | 1040 | unix_peer(sk) = other; |
278a3de5 | 1041 | unix_state_double_unlock(sk, other); |
1da177e4 | 1042 | } |
ac7bfa62 | 1043 | return 0; |
1da177e4 LT |
1044 | |
1045 | out_unlock: | |
278a3de5 | 1046 | unix_state_double_unlock(sk, other); |
1da177e4 LT |
1047 | sock_put(other); |
1048 | out: | |
1049 | return err; | |
1050 | } | |
1051 | ||
1052 | static long unix_wait_for_peer(struct sock *other, long timeo) | |
1053 | { | |
1054 | struct unix_sock *u = unix_sk(other); | |
1055 | int sched; | |
1056 | DEFINE_WAIT(wait); | |
1057 | ||
1058 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); | |
1059 | ||
1060 | sched = !sock_flag(other, SOCK_DEAD) && | |
1061 | !(other->sk_shutdown & RCV_SHUTDOWN) && | |
3c73419c | 1062 | unix_recvq_full(other); |
1da177e4 | 1063 | |
1c92b4e5 | 1064 | unix_state_unlock(other); |
1da177e4 LT |
1065 | |
1066 | if (sched) | |
1067 | timeo = schedule_timeout(timeo); | |
1068 | ||
1069 | finish_wait(&u->peer_wait, &wait); | |
1070 | return timeo; | |
1071 | } | |
1072 | ||
1073 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, | |
1074 | int addr_len, int flags) | |
1075 | { | |
e27dfcea | 1076 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
1da177e4 | 1077 | struct sock *sk = sock->sk; |
3b1e0a65 | 1078 | struct net *net = sock_net(sk); |
1da177e4 LT |
1079 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
1080 | struct sock *newsk = NULL; | |
1081 | struct sock *other = NULL; | |
1082 | struct sk_buff *skb = NULL; | |
95c96174 | 1083 | unsigned int hash; |
1da177e4 LT |
1084 | int st; |
1085 | int err; | |
1086 | long timeo; | |
1087 | ||
1088 | err = unix_mkname(sunaddr, addr_len, &hash); | |
1089 | if (err < 0) | |
1090 | goto out; | |
1091 | addr_len = err; | |
1092 | ||
f64f9e71 JP |
1093 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr && |
1094 | (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1095 | goto out; |
1096 | ||
1097 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); | |
1098 | ||
1099 | /* First of all allocate resources. | |
1100 | If we will make it after state is locked, | |
1101 | we will have to recheck all again in any case. | |
1102 | */ | |
1103 | ||
1104 | err = -ENOMEM; | |
1105 | ||
1106 | /* create new sock for complete connection */ | |
11aa9c28 | 1107 | newsk = unix_create1(sock_net(sk), NULL, 0); |
1da177e4 LT |
1108 | if (newsk == NULL) |
1109 | goto out; | |
1110 | ||
1111 | /* Allocate skb for sending to listening sock */ | |
1112 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); | |
1113 | if (skb == NULL) | |
1114 | goto out; | |
1115 | ||
1116 | restart: | |
1117 | /* Find listening sock. */ | |
097e66c5 | 1118 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
1da177e4 LT |
1119 | if (!other) |
1120 | goto out; | |
1121 | ||
1122 | /* Latch state of peer */ | |
1c92b4e5 | 1123 | unix_state_lock(other); |
1da177e4 LT |
1124 | |
1125 | /* Apparently VFS overslept socket death. Retry. */ | |
1126 | if (sock_flag(other, SOCK_DEAD)) { | |
1c92b4e5 | 1127 | unix_state_unlock(other); |
1da177e4 LT |
1128 | sock_put(other); |
1129 | goto restart; | |
1130 | } | |
1131 | ||
1132 | err = -ECONNREFUSED; | |
1133 | if (other->sk_state != TCP_LISTEN) | |
1134 | goto out_unlock; | |
77238f2b TS |
1135 | if (other->sk_shutdown & RCV_SHUTDOWN) |
1136 | goto out_unlock; | |
1da177e4 | 1137 | |
3c73419c | 1138 | if (unix_recvq_full(other)) { |
1da177e4 LT |
1139 | err = -EAGAIN; |
1140 | if (!timeo) | |
1141 | goto out_unlock; | |
1142 | ||
1143 | timeo = unix_wait_for_peer(other, timeo); | |
1144 | ||
1145 | err = sock_intr_errno(timeo); | |
1146 | if (signal_pending(current)) | |
1147 | goto out; | |
1148 | sock_put(other); | |
1149 | goto restart; | |
ac7bfa62 | 1150 | } |
1da177e4 LT |
1151 | |
1152 | /* Latch our state. | |
1153 | ||
e5537bfc | 1154 | It is tricky place. We need to grab our state lock and cannot |
1da177e4 LT |
1155 | drop lock on peer. It is dangerous because deadlock is |
1156 | possible. Connect to self case and simultaneous | |
1157 | attempt to connect are eliminated by checking socket | |
1158 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we | |
1159 | check this before attempt to grab lock. | |
1160 | ||
1161 | Well, and we have to recheck the state after socket locked. | |
1162 | */ | |
1163 | st = sk->sk_state; | |
1164 | ||
1165 | switch (st) { | |
1166 | case TCP_CLOSE: | |
1167 | /* This is ok... continue with connect */ | |
1168 | break; | |
1169 | case TCP_ESTABLISHED: | |
1170 | /* Socket is already connected */ | |
1171 | err = -EISCONN; | |
1172 | goto out_unlock; | |
1173 | default: | |
1174 | err = -EINVAL; | |
1175 | goto out_unlock; | |
1176 | } | |
1177 | ||
1c92b4e5 | 1178 | unix_state_lock_nested(sk); |
1da177e4 LT |
1179 | |
1180 | if (sk->sk_state != st) { | |
1c92b4e5 DM |
1181 | unix_state_unlock(sk); |
1182 | unix_state_unlock(other); | |
1da177e4 LT |
1183 | sock_put(other); |
1184 | goto restart; | |
1185 | } | |
1186 | ||
3610cda5 | 1187 | err = security_unix_stream_connect(sk, other, newsk); |
1da177e4 | 1188 | if (err) { |
1c92b4e5 | 1189 | unix_state_unlock(sk); |
1da177e4 LT |
1190 | goto out_unlock; |
1191 | } | |
1192 | ||
1193 | /* The way is open! Fastly set all the necessary fields... */ | |
1194 | ||
1195 | sock_hold(sk); | |
1196 | unix_peer(newsk) = sk; | |
1197 | newsk->sk_state = TCP_ESTABLISHED; | |
1198 | newsk->sk_type = sk->sk_type; | |
109f6e39 | 1199 | init_peercred(newsk); |
1da177e4 | 1200 | newu = unix_sk(newsk); |
eaefd110 | 1201 | RCU_INIT_POINTER(newsk->sk_wq, &newu->peer_wq); |
1da177e4 LT |
1202 | otheru = unix_sk(other); |
1203 | ||
1204 | /* copy address information from listening to new sock*/ | |
1205 | if (otheru->addr) { | |
1206 | atomic_inc(&otheru->addr->refcnt); | |
1207 | newu->addr = otheru->addr; | |
1208 | } | |
40ffe67d AV |
1209 | if (otheru->path.dentry) { |
1210 | path_get(&otheru->path); | |
1211 | newu->path = otheru->path; | |
1da177e4 LT |
1212 | } |
1213 | ||
1214 | /* Set credentials */ | |
109f6e39 | 1215 | copy_peercred(sk, other); |
1da177e4 | 1216 | |
1da177e4 LT |
1217 | sock->state = SS_CONNECTED; |
1218 | sk->sk_state = TCP_ESTABLISHED; | |
830a1e5c BL |
1219 | sock_hold(newsk); |
1220 | ||
4e857c58 | 1221 | smp_mb__after_atomic(); /* sock_hold() does an atomic_inc() */ |
830a1e5c | 1222 | unix_peer(sk) = newsk; |
1da177e4 | 1223 | |
1c92b4e5 | 1224 | unix_state_unlock(sk); |
1da177e4 LT |
1225 | |
1226 | /* take ten and and send info to listening sock */ | |
1227 | spin_lock(&other->sk_receive_queue.lock); | |
1228 | __skb_queue_tail(&other->sk_receive_queue, skb); | |
1da177e4 | 1229 | spin_unlock(&other->sk_receive_queue.lock); |
1c92b4e5 | 1230 | unix_state_unlock(other); |
676d2369 | 1231 | other->sk_data_ready(other); |
1da177e4 LT |
1232 | sock_put(other); |
1233 | return 0; | |
1234 | ||
1235 | out_unlock: | |
1236 | if (other) | |
1c92b4e5 | 1237 | unix_state_unlock(other); |
1da177e4 LT |
1238 | |
1239 | out: | |
40d44446 | 1240 | kfree_skb(skb); |
1da177e4 LT |
1241 | if (newsk) |
1242 | unix_release_sock(newsk, 0); | |
1243 | if (other) | |
1244 | sock_put(other); | |
1245 | return err; | |
1246 | } | |
1247 | ||
1248 | static int unix_socketpair(struct socket *socka, struct socket *sockb) | |
1249 | { | |
e27dfcea | 1250 | struct sock *ska = socka->sk, *skb = sockb->sk; |
1da177e4 LT |
1251 | |
1252 | /* Join our sockets back to back */ | |
1253 | sock_hold(ska); | |
1254 | sock_hold(skb); | |
e27dfcea JK |
1255 | unix_peer(ska) = skb; |
1256 | unix_peer(skb) = ska; | |
109f6e39 EB |
1257 | init_peercred(ska); |
1258 | init_peercred(skb); | |
1da177e4 LT |
1259 | |
1260 | if (ska->sk_type != SOCK_DGRAM) { | |
1261 | ska->sk_state = TCP_ESTABLISHED; | |
1262 | skb->sk_state = TCP_ESTABLISHED; | |
1263 | socka->state = SS_CONNECTED; | |
1264 | sockb->state = SS_CONNECTED; | |
1265 | } | |
1266 | return 0; | |
1267 | } | |
1268 | ||
90c6bd34 DB |
1269 | static void unix_sock_inherit_flags(const struct socket *old, |
1270 | struct socket *new) | |
1271 | { | |
1272 | if (test_bit(SOCK_PASSCRED, &old->flags)) | |
1273 | set_bit(SOCK_PASSCRED, &new->flags); | |
1274 | if (test_bit(SOCK_PASSSEC, &old->flags)) | |
1275 | set_bit(SOCK_PASSSEC, &new->flags); | |
1276 | } | |
1277 | ||
1da177e4 LT |
1278 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) |
1279 | { | |
1280 | struct sock *sk = sock->sk; | |
1281 | struct sock *tsk; | |
1282 | struct sk_buff *skb; | |
1283 | int err; | |
1284 | ||
1285 | err = -EOPNOTSUPP; | |
6eba6a37 | 1286 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
1da177e4 LT |
1287 | goto out; |
1288 | ||
1289 | err = -EINVAL; | |
1290 | if (sk->sk_state != TCP_LISTEN) | |
1291 | goto out; | |
1292 | ||
1293 | /* If socket state is TCP_LISTEN it cannot change (for now...), | |
1294 | * so that no locks are necessary. | |
1295 | */ | |
1296 | ||
1297 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); | |
1298 | if (!skb) { | |
1299 | /* This means receive shutdown. */ | |
1300 | if (err == 0) | |
1301 | err = -EINVAL; | |
1302 | goto out; | |
1303 | } | |
1304 | ||
1305 | tsk = skb->sk; | |
1306 | skb_free_datagram(sk, skb); | |
1307 | wake_up_interruptible(&unix_sk(sk)->peer_wait); | |
1308 | ||
1309 | /* attach accepted sock to socket */ | |
1c92b4e5 | 1310 | unix_state_lock(tsk); |
1da177e4 | 1311 | newsock->state = SS_CONNECTED; |
90c6bd34 | 1312 | unix_sock_inherit_flags(sock, newsock); |
1da177e4 | 1313 | sock_graft(tsk, newsock); |
1c92b4e5 | 1314 | unix_state_unlock(tsk); |
1da177e4 LT |
1315 | return 0; |
1316 | ||
1317 | out: | |
1318 | return err; | |
1319 | } | |
1320 | ||
1321 | ||
1322 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) | |
1323 | { | |
1324 | struct sock *sk = sock->sk; | |
1325 | struct unix_sock *u; | |
13cfa97b | 1326 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, uaddr); |
1da177e4 LT |
1327 | int err = 0; |
1328 | ||
1329 | if (peer) { | |
1330 | sk = unix_peer_get(sk); | |
1331 | ||
1332 | err = -ENOTCONN; | |
1333 | if (!sk) | |
1334 | goto out; | |
1335 | err = 0; | |
1336 | } else { | |
1337 | sock_hold(sk); | |
1338 | } | |
1339 | ||
1340 | u = unix_sk(sk); | |
1c92b4e5 | 1341 | unix_state_lock(sk); |
1da177e4 LT |
1342 | if (!u->addr) { |
1343 | sunaddr->sun_family = AF_UNIX; | |
1344 | sunaddr->sun_path[0] = 0; | |
1345 | *uaddr_len = sizeof(short); | |
1346 | } else { | |
1347 | struct unix_address *addr = u->addr; | |
1348 | ||
1349 | *uaddr_len = addr->len; | |
1350 | memcpy(sunaddr, addr->name, *uaddr_len); | |
1351 | } | |
1c92b4e5 | 1352 | unix_state_unlock(sk); |
1da177e4 LT |
1353 | sock_put(sk); |
1354 | out: | |
1355 | return err; | |
1356 | } | |
1357 | ||
1358 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) | |
1359 | { | |
1360 | int i; | |
1361 | ||
1362 | scm->fp = UNIXCB(skb).fp; | |
1da177e4 LT |
1363 | UNIXCB(skb).fp = NULL; |
1364 | ||
6eba6a37 | 1365 | for (i = scm->fp->count-1; i >= 0; i--) |
1da177e4 LT |
1366 | unix_notinflight(scm->fp->fp[i]); |
1367 | } | |
1368 | ||
7361c36c | 1369 | static void unix_destruct_scm(struct sk_buff *skb) |
1da177e4 LT |
1370 | { |
1371 | struct scm_cookie scm; | |
1372 | memset(&scm, 0, sizeof(scm)); | |
7361c36c | 1373 | scm.pid = UNIXCB(skb).pid; |
7361c36c EB |
1374 | if (UNIXCB(skb).fp) |
1375 | unix_detach_fds(&scm, skb); | |
1da177e4 LT |
1376 | |
1377 | /* Alas, it calls VFS */ | |
1378 | /* So fscking what? fput() had been SMP-safe since the last Summer */ | |
1379 | scm_destroy(&scm); | |
1380 | sock_wfree(skb); | |
1381 | } | |
1382 | ||
25888e30 ED |
1383 | #define MAX_RECURSION_LEVEL 4 |
1384 | ||
6209344f | 1385 | static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
1da177e4 LT |
1386 | { |
1387 | int i; | |
25888e30 ED |
1388 | unsigned char max_level = 0; |
1389 | int unix_sock_count = 0; | |
1390 | ||
1391 | for (i = scm->fp->count - 1; i >= 0; i--) { | |
1392 | struct sock *sk = unix_get_socket(scm->fp->fp[i]); | |
1393 | ||
1394 | if (sk) { | |
1395 | unix_sock_count++; | |
1396 | max_level = max(max_level, | |
1397 | unix_sk(sk)->recursion_level); | |
1398 | } | |
1399 | } | |
1400 | if (unlikely(max_level > MAX_RECURSION_LEVEL)) | |
1401 | return -ETOOMANYREFS; | |
6209344f MS |
1402 | |
1403 | /* | |
1404 | * Need to duplicate file references for the sake of garbage | |
1405 | * collection. Otherwise a socket in the fps might become a | |
1406 | * candidate for GC while the skb is not yet queued. | |
1407 | */ | |
1408 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); | |
1409 | if (!UNIXCB(skb).fp) | |
1410 | return -ENOMEM; | |
1411 | ||
25888e30 ED |
1412 | if (unix_sock_count) { |
1413 | for (i = scm->fp->count - 1; i >= 0; i--) | |
1414 | unix_inflight(scm->fp->fp[i]); | |
1415 | } | |
1416 | return max_level; | |
1da177e4 LT |
1417 | } |
1418 | ||
f78a5fda | 1419 | static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds) |
7361c36c EB |
1420 | { |
1421 | int err = 0; | |
16e57262 | 1422 | |
f78a5fda | 1423 | UNIXCB(skb).pid = get_pid(scm->pid); |
6b0ee8c0 EB |
1424 | UNIXCB(skb).uid = scm->creds.uid; |
1425 | UNIXCB(skb).gid = scm->creds.gid; | |
7361c36c | 1426 | UNIXCB(skb).fp = NULL; |
37a9a8df | 1427 | unix_get_secdata(scm, skb); |
7361c36c EB |
1428 | if (scm->fp && send_fds) |
1429 | err = unix_attach_fds(scm, skb); | |
1430 | ||
1431 | skb->destructor = unix_destruct_scm; | |
1432 | return err; | |
1433 | } | |
1434 | ||
16e57262 ED |
1435 | /* |
1436 | * Some apps rely on write() giving SCM_CREDENTIALS | |
1437 | * We include credentials if source or destination socket | |
1438 | * asserted SOCK_PASSCRED. | |
1439 | */ | |
1440 | static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock, | |
1441 | const struct sock *other) | |
1442 | { | |
6b0ee8c0 | 1443 | if (UNIXCB(skb).pid) |
16e57262 ED |
1444 | return; |
1445 | if (test_bit(SOCK_PASSCRED, &sock->flags) || | |
25da0e3e EB |
1446 | !other->sk_socket || |
1447 | test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) { | |
16e57262 | 1448 | UNIXCB(skb).pid = get_pid(task_tgid(current)); |
6e0895c2 | 1449 | current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid); |
16e57262 ED |
1450 | } |
1451 | } | |
1452 | ||
1da177e4 LT |
1453 | /* |
1454 | * Send AF_UNIX data. | |
1455 | */ | |
1456 | ||
1b784140 YX |
1457 | static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
1458 | size_t len) | |
1da177e4 | 1459 | { |
1da177e4 | 1460 | struct sock *sk = sock->sk; |
3b1e0a65 | 1461 | struct net *net = sock_net(sk); |
1da177e4 | 1462 | struct unix_sock *u = unix_sk(sk); |
342dfc30 | 1463 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, msg->msg_name); |
1da177e4 LT |
1464 | struct sock *other = NULL; |
1465 | int namelen = 0; /* fake GCC */ | |
1466 | int err; | |
95c96174 | 1467 | unsigned int hash; |
f78a5fda | 1468 | struct sk_buff *skb; |
1da177e4 | 1469 | long timeo; |
7cc05662 | 1470 | struct scm_cookie scm; |
25888e30 | 1471 | int max_level; |
eb6a2481 | 1472 | int data_len = 0; |
1da177e4 | 1473 | |
5f23b734 | 1474 | wait_for_unix_gc(); |
7cc05662 | 1475 | err = scm_send(sock, msg, &scm, false); |
1da177e4 LT |
1476 | if (err < 0) |
1477 | return err; | |
1478 | ||
1479 | err = -EOPNOTSUPP; | |
1480 | if (msg->msg_flags&MSG_OOB) | |
1481 | goto out; | |
1482 | ||
1483 | if (msg->msg_namelen) { | |
1484 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); | |
1485 | if (err < 0) | |
1486 | goto out; | |
1487 | namelen = err; | |
1488 | } else { | |
1489 | sunaddr = NULL; | |
1490 | err = -ENOTCONN; | |
1491 | other = unix_peer_get(sk); | |
1492 | if (!other) | |
1493 | goto out; | |
1494 | } | |
1495 | ||
f64f9e71 JP |
1496 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr |
1497 | && (err = unix_autobind(sock)) != 0) | |
1da177e4 LT |
1498 | goto out; |
1499 | ||
1500 | err = -EMSGSIZE; | |
1501 | if (len > sk->sk_sndbuf - 32) | |
1502 | goto out; | |
1503 | ||
31ff6aa5 | 1504 | if (len > SKB_MAX_ALLOC) { |
eb6a2481 ED |
1505 | data_len = min_t(size_t, |
1506 | len - SKB_MAX_ALLOC, | |
1507 | MAX_SKB_FRAGS * PAGE_SIZE); | |
31ff6aa5 KT |
1508 | data_len = PAGE_ALIGN(data_len); |
1509 | ||
1510 | BUILD_BUG_ON(SKB_MAX_ALLOC < PAGE_SIZE); | |
1511 | } | |
eb6a2481 ED |
1512 | |
1513 | skb = sock_alloc_send_pskb(sk, len - data_len, data_len, | |
28d64271 ED |
1514 | msg->msg_flags & MSG_DONTWAIT, &err, |
1515 | PAGE_ALLOC_COSTLY_ORDER); | |
e27dfcea | 1516 | if (skb == NULL) |
1da177e4 LT |
1517 | goto out; |
1518 | ||
7cc05662 | 1519 | err = unix_scm_to_skb(&scm, skb, true); |
25888e30 | 1520 | if (err < 0) |
7361c36c | 1521 | goto out_free; |
25888e30 | 1522 | max_level = err + 1; |
877ce7c1 | 1523 | |
eb6a2481 ED |
1524 | skb_put(skb, len - data_len); |
1525 | skb->data_len = data_len; | |
1526 | skb->len = len; | |
c0371da6 | 1527 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); |
1da177e4 LT |
1528 | if (err) |
1529 | goto out_free; | |
1530 | ||
1531 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); | |
1532 | ||
1533 | restart: | |
1534 | if (!other) { | |
1535 | err = -ECONNRESET; | |
1536 | if (sunaddr == NULL) | |
1537 | goto out_free; | |
1538 | ||
097e66c5 | 1539 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
1da177e4 | 1540 | hash, &err); |
e27dfcea | 1541 | if (other == NULL) |
1da177e4 LT |
1542 | goto out_free; |
1543 | } | |
1544 | ||
d6ae3bae AC |
1545 | if (sk_filter(other, skb) < 0) { |
1546 | /* Toss the packet but do not return any error to the sender */ | |
1547 | err = len; | |
1548 | goto out_free; | |
1549 | } | |
1550 | ||
1c92b4e5 | 1551 | unix_state_lock(other); |
1da177e4 LT |
1552 | err = -EPERM; |
1553 | if (!unix_may_send(sk, other)) | |
1554 | goto out_unlock; | |
1555 | ||
1556 | if (sock_flag(other, SOCK_DEAD)) { | |
1557 | /* | |
1558 | * Check with 1003.1g - what should | |
1559 | * datagram error | |
1560 | */ | |
1c92b4e5 | 1561 | unix_state_unlock(other); |
1da177e4 LT |
1562 | sock_put(other); |
1563 | ||
1564 | err = 0; | |
1c92b4e5 | 1565 | unix_state_lock(sk); |
1da177e4 | 1566 | if (unix_peer(sk) == other) { |
e27dfcea | 1567 | unix_peer(sk) = NULL; |
1c92b4e5 | 1568 | unix_state_unlock(sk); |
1da177e4 LT |
1569 | |
1570 | unix_dgram_disconnected(sk, other); | |
1571 | sock_put(other); | |
1572 | err = -ECONNREFUSED; | |
1573 | } else { | |
1c92b4e5 | 1574 | unix_state_unlock(sk); |
1da177e4 LT |
1575 | } |
1576 | ||
1577 | other = NULL; | |
1578 | if (err) | |
1579 | goto out_free; | |
1580 | goto restart; | |
1581 | } | |
1582 | ||
1583 | err = -EPIPE; | |
1584 | if (other->sk_shutdown & RCV_SHUTDOWN) | |
1585 | goto out_unlock; | |
1586 | ||
1587 | if (sk->sk_type != SOCK_SEQPACKET) { | |
1588 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); | |
1589 | if (err) | |
1590 | goto out_unlock; | |
1591 | } | |
1592 | ||
3c73419c | 1593 | if (unix_peer(other) != sk && unix_recvq_full(other)) { |
1da177e4 LT |
1594 | if (!timeo) { |
1595 | err = -EAGAIN; | |
1596 | goto out_unlock; | |
1597 | } | |
1598 | ||
1599 | timeo = unix_wait_for_peer(other, timeo); | |
1600 | ||
1601 | err = sock_intr_errno(timeo); | |
1602 | if (signal_pending(current)) | |
1603 | goto out_free; | |
1604 | ||
1605 | goto restart; | |
1606 | } | |
1607 | ||
3f66116e AC |
1608 | if (sock_flag(other, SOCK_RCVTSTAMP)) |
1609 | __net_timestamp(skb); | |
16e57262 | 1610 | maybe_add_creds(skb, sock, other); |
1da177e4 | 1611 | skb_queue_tail(&other->sk_receive_queue, skb); |
25888e30 ED |
1612 | if (max_level > unix_sk(other)->recursion_level) |
1613 | unix_sk(other)->recursion_level = max_level; | |
1c92b4e5 | 1614 | unix_state_unlock(other); |
676d2369 | 1615 | other->sk_data_ready(other); |
1da177e4 | 1616 | sock_put(other); |
7cc05662 | 1617 | scm_destroy(&scm); |
1da177e4 LT |
1618 | return len; |
1619 | ||
1620 | out_unlock: | |
1c92b4e5 | 1621 | unix_state_unlock(other); |
1da177e4 LT |
1622 | out_free: |
1623 | kfree_skb(skb); | |
1624 | out: | |
1625 | if (other) | |
1626 | sock_put(other); | |
7cc05662 | 1627 | scm_destroy(&scm); |
1da177e4 LT |
1628 | return err; |
1629 | } | |
1630 | ||
e370a723 ED |
1631 | /* We use paged skbs for stream sockets, and limit occupancy to 32768 |
1632 | * bytes, and a minimun of a full page. | |
1633 | */ | |
1634 | #define UNIX_SKB_FRAGS_SZ (PAGE_SIZE << get_order(32768)) | |
ac7bfa62 | 1635 | |
1b784140 YX |
1636 | static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
1637 | size_t len) | |
1da177e4 | 1638 | { |
1da177e4 LT |
1639 | struct sock *sk = sock->sk; |
1640 | struct sock *other = NULL; | |
6eba6a37 | 1641 | int err, size; |
f78a5fda | 1642 | struct sk_buff *skb; |
e27dfcea | 1643 | int sent = 0; |
7cc05662 | 1644 | struct scm_cookie scm; |
8ba69ba6 | 1645 | bool fds_sent = false; |
25888e30 | 1646 | int max_level; |
e370a723 | 1647 | int data_len; |
1da177e4 | 1648 | |
5f23b734 | 1649 | wait_for_unix_gc(); |
7cc05662 | 1650 | err = scm_send(sock, msg, &scm, false); |
1da177e4 LT |
1651 | if (err < 0) |
1652 | return err; | |
1653 | ||
1654 | err = -EOPNOTSUPP; | |
1655 | if (msg->msg_flags&MSG_OOB) | |
1656 | goto out_err; | |
1657 | ||
1658 | if (msg->msg_namelen) { | |
1659 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; | |
1660 | goto out_err; | |
1661 | } else { | |
1da177e4 | 1662 | err = -ENOTCONN; |
830a1e5c | 1663 | other = unix_peer(sk); |
1da177e4 LT |
1664 | if (!other) |
1665 | goto out_err; | |
1666 | } | |
1667 | ||
1668 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1669 | goto pipe_err; | |
1670 | ||
6eba6a37 | 1671 | while (sent < len) { |
e370a723 | 1672 | size = len - sent; |
1da177e4 LT |
1673 | |
1674 | /* Keep two messages in the pipe so it schedules better */ | |
e370a723 | 1675 | size = min_t(int, size, (sk->sk_sndbuf >> 1) - 64); |
1da177e4 | 1676 | |
e370a723 ED |
1677 | /* allow fallback to order-0 allocations */ |
1678 | size = min_t(int, size, SKB_MAX_HEAD(0) + UNIX_SKB_FRAGS_SZ); | |
ac7bfa62 | 1679 | |
e370a723 | 1680 | data_len = max_t(int, 0, size - SKB_MAX_HEAD(0)); |
1da177e4 | 1681 | |
31ff6aa5 KT |
1682 | data_len = min_t(size_t, size, PAGE_ALIGN(data_len)); |
1683 | ||
e370a723 | 1684 | skb = sock_alloc_send_pskb(sk, size - data_len, data_len, |
28d64271 ED |
1685 | msg->msg_flags & MSG_DONTWAIT, &err, |
1686 | get_order(UNIX_SKB_FRAGS_SZ)); | |
e370a723 | 1687 | if (!skb) |
1da177e4 LT |
1688 | goto out_err; |
1689 | ||
f78a5fda | 1690 | /* Only send the fds in the first buffer */ |
7cc05662 | 1691 | err = unix_scm_to_skb(&scm, skb, !fds_sent); |
25888e30 | 1692 | if (err < 0) { |
7361c36c | 1693 | kfree_skb(skb); |
f78a5fda | 1694 | goto out_err; |
6209344f | 1695 | } |
25888e30 | 1696 | max_level = err + 1; |
7361c36c | 1697 | fds_sent = true; |
1da177e4 | 1698 | |
e370a723 ED |
1699 | skb_put(skb, size - data_len); |
1700 | skb->data_len = data_len; | |
1701 | skb->len = size; | |
c0371da6 | 1702 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size); |
6eba6a37 | 1703 | if (err) { |
1da177e4 | 1704 | kfree_skb(skb); |
f78a5fda | 1705 | goto out_err; |
1da177e4 LT |
1706 | } |
1707 | ||
1c92b4e5 | 1708 | unix_state_lock(other); |
1da177e4 LT |
1709 | |
1710 | if (sock_flag(other, SOCK_DEAD) || | |
1711 | (other->sk_shutdown & RCV_SHUTDOWN)) | |
1712 | goto pipe_err_free; | |
1713 | ||
16e57262 | 1714 | maybe_add_creds(skb, sock, other); |
1da177e4 | 1715 | skb_queue_tail(&other->sk_receive_queue, skb); |
25888e30 ED |
1716 | if (max_level > unix_sk(other)->recursion_level) |
1717 | unix_sk(other)->recursion_level = max_level; | |
1c92b4e5 | 1718 | unix_state_unlock(other); |
676d2369 | 1719 | other->sk_data_ready(other); |
e27dfcea | 1720 | sent += size; |
1da177e4 | 1721 | } |
1da177e4 | 1722 | |
7cc05662 | 1723 | scm_destroy(&scm); |
1da177e4 LT |
1724 | |
1725 | return sent; | |
1726 | ||
1727 | pipe_err_free: | |
1c92b4e5 | 1728 | unix_state_unlock(other); |
1da177e4 LT |
1729 | kfree_skb(skb); |
1730 | pipe_err: | |
6eba6a37 ED |
1731 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
1732 | send_sig(SIGPIPE, current, 0); | |
1da177e4 LT |
1733 | err = -EPIPE; |
1734 | out_err: | |
7cc05662 | 1735 | scm_destroy(&scm); |
1da177e4 LT |
1736 | return sent ? : err; |
1737 | } | |
1738 | ||
869e7c62 HFS |
1739 | static ssize_t unix_stream_sendpage(struct socket *socket, struct page *page, |
1740 | int offset, size_t size, int flags) | |
1741 | { | |
1742 | int err = 0; | |
1743 | bool send_sigpipe = true; | |
1744 | struct sock *other, *sk = socket->sk; | |
1745 | struct sk_buff *skb, *newskb = NULL, *tail = NULL; | |
1746 | ||
1747 | if (flags & MSG_OOB) | |
1748 | return -EOPNOTSUPP; | |
1749 | ||
1750 | other = unix_peer(sk); | |
1751 | if (!other || sk->sk_state != TCP_ESTABLISHED) | |
1752 | return -ENOTCONN; | |
1753 | ||
1754 | if (false) { | |
1755 | alloc_skb: | |
1756 | unix_state_unlock(other); | |
1757 | mutex_unlock(&unix_sk(other)->readlock); | |
1758 | newskb = sock_alloc_send_pskb(sk, 0, 0, flags & MSG_DONTWAIT, | |
1759 | &err, 0); | |
1760 | if (!newskb) | |
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | /* we must acquire readlock as we modify already present | |
1765 | * skbs in the sk_receive_queue and mess with skb->len | |
1766 | */ | |
1767 | err = mutex_lock_interruptible(&unix_sk(other)->readlock); | |
1768 | if (err) { | |
1769 | err = flags & MSG_DONTWAIT ? -EAGAIN : -ERESTARTSYS; | |
1770 | send_sigpipe = false; | |
1771 | goto err; | |
1772 | } | |
1773 | ||
1774 | if (sk->sk_shutdown & SEND_SHUTDOWN) { | |
1775 | err = -EPIPE; | |
1776 | goto err_unlock; | |
1777 | } | |
1778 | ||
1779 | unix_state_lock(other); | |
1780 | ||
1781 | if (sock_flag(other, SOCK_DEAD) || | |
1782 | other->sk_shutdown & RCV_SHUTDOWN) { | |
1783 | err = -EPIPE; | |
1784 | goto err_state_unlock; | |
1785 | } | |
1786 | ||
1787 | skb = skb_peek_tail(&other->sk_receive_queue); | |
1788 | if (tail && tail == skb) { | |
1789 | skb = newskb; | |
1790 | } else if (!skb) { | |
1791 | if (newskb) | |
1792 | skb = newskb; | |
1793 | else | |
1794 | goto alloc_skb; | |
1795 | } else if (newskb) { | |
1796 | /* this is fast path, we don't necessarily need to | |
1797 | * call to kfree_skb even though with newskb == NULL | |
1798 | * this - does no harm | |
1799 | */ | |
1800 | consume_skb(newskb); | |
1801 | } | |
1802 | ||
1803 | if (skb_append_pagefrags(skb, page, offset, size)) { | |
1804 | tail = skb; | |
1805 | goto alloc_skb; | |
1806 | } | |
1807 | ||
1808 | skb->len += size; | |
1809 | skb->data_len += size; | |
1810 | skb->truesize += size; | |
1811 | atomic_add(size, &sk->sk_wmem_alloc); | |
1812 | ||
1813 | if (newskb) | |
1814 | __skb_queue_tail(&other->sk_receive_queue, newskb); | |
1815 | ||
1816 | unix_state_unlock(other); | |
1817 | mutex_unlock(&unix_sk(other)->readlock); | |
1818 | ||
1819 | other->sk_data_ready(other); | |
1820 | ||
1821 | return size; | |
1822 | ||
1823 | err_state_unlock: | |
1824 | unix_state_unlock(other); | |
1825 | err_unlock: | |
1826 | mutex_unlock(&unix_sk(other)->readlock); | |
1827 | err: | |
1828 | kfree_skb(newskb); | |
1829 | if (send_sigpipe && !(flags & MSG_NOSIGNAL)) | |
1830 | send_sig(SIGPIPE, current, 0); | |
1831 | return err; | |
1832 | } | |
1833 | ||
1b784140 YX |
1834 | static int unix_seqpacket_sendmsg(struct socket *sock, struct msghdr *msg, |
1835 | size_t len) | |
1da177e4 LT |
1836 | { |
1837 | int err; | |
1838 | struct sock *sk = sock->sk; | |
ac7bfa62 | 1839 | |
1da177e4 LT |
1840 | err = sock_error(sk); |
1841 | if (err) | |
1842 | return err; | |
1843 | ||
1844 | if (sk->sk_state != TCP_ESTABLISHED) | |
1845 | return -ENOTCONN; | |
1846 | ||
1847 | if (msg->msg_namelen) | |
1848 | msg->msg_namelen = 0; | |
1849 | ||
1b784140 | 1850 | return unix_dgram_sendmsg(sock, msg, len); |
1da177e4 | 1851 | } |
ac7bfa62 | 1852 | |
1b784140 YX |
1853 | static int unix_seqpacket_recvmsg(struct socket *sock, struct msghdr *msg, |
1854 | size_t size, int flags) | |
a05d2ad1 EB |
1855 | { |
1856 | struct sock *sk = sock->sk; | |
1857 | ||
1858 | if (sk->sk_state != TCP_ESTABLISHED) | |
1859 | return -ENOTCONN; | |
1860 | ||
1b784140 | 1861 | return unix_dgram_recvmsg(sock, msg, size, flags); |
a05d2ad1 EB |
1862 | } |
1863 | ||
1da177e4 LT |
1864 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
1865 | { | |
1866 | struct unix_sock *u = unix_sk(sk); | |
1867 | ||
1da177e4 LT |
1868 | if (u->addr) { |
1869 | msg->msg_namelen = u->addr->len; | |
1870 | memcpy(msg->msg_name, u->addr->name, u->addr->len); | |
1871 | } | |
1872 | } | |
1873 | ||
1b784140 YX |
1874 | static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
1875 | size_t size, int flags) | |
1da177e4 | 1876 | { |
7cc05662 | 1877 | struct scm_cookie scm; |
1da177e4 LT |
1878 | struct sock *sk = sock->sk; |
1879 | struct unix_sock *u = unix_sk(sk); | |
1880 | int noblock = flags & MSG_DONTWAIT; | |
1881 | struct sk_buff *skb; | |
1882 | int err; | |
f55bb7f9 | 1883 | int peeked, skip; |
1da177e4 LT |
1884 | |
1885 | err = -EOPNOTSUPP; | |
1886 | if (flags&MSG_OOB) | |
1887 | goto out; | |
1888 | ||
b3ca9b02 | 1889 | err = mutex_lock_interruptible(&u->readlock); |
de144391 ED |
1890 | if (unlikely(err)) { |
1891 | /* recvmsg() in non blocking mode is supposed to return -EAGAIN | |
1892 | * sk_rcvtimeo is not honored by mutex_lock_interruptible() | |
1893 | */ | |
1894 | err = noblock ? -EAGAIN : -ERESTARTSYS; | |
b3ca9b02 RW |
1895 | goto out; |
1896 | } | |
1da177e4 | 1897 | |
f55bb7f9 PE |
1898 | skip = sk_peek_offset(sk, flags); |
1899 | ||
1900 | skb = __skb_recv_datagram(sk, flags, &peeked, &skip, &err); | |
0a112258 FZ |
1901 | if (!skb) { |
1902 | unix_state_lock(sk); | |
1903 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ | |
1904 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && | |
1905 | (sk->sk_shutdown & RCV_SHUTDOWN)) | |
1906 | err = 0; | |
1907 | unix_state_unlock(sk); | |
1da177e4 | 1908 | goto out_unlock; |
0a112258 | 1909 | } |
1da177e4 | 1910 | |
67426b75 ED |
1911 | wake_up_interruptible_sync_poll(&u->peer_wait, |
1912 | POLLOUT | POLLWRNORM | POLLWRBAND); | |
1da177e4 LT |
1913 | |
1914 | if (msg->msg_name) | |
1915 | unix_copy_addr(msg, skb->sk); | |
1916 | ||
f55bb7f9 PE |
1917 | if (size > skb->len - skip) |
1918 | size = skb->len - skip; | |
1919 | else if (size < skb->len - skip) | |
1da177e4 LT |
1920 | msg->msg_flags |= MSG_TRUNC; |
1921 | ||
51f3d02b | 1922 | err = skb_copy_datagram_msg(skb, skip, msg, size); |
1da177e4 LT |
1923 | if (err) |
1924 | goto out_free; | |
1925 | ||
3f66116e AC |
1926 | if (sock_flag(sk, SOCK_RCVTSTAMP)) |
1927 | __sock_recv_timestamp(msg, sk, skb); | |
1928 | ||
7cc05662 CH |
1929 | memset(&scm, 0, sizeof(scm)); |
1930 | ||
1931 | scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); | |
1932 | unix_set_secdata(&scm, skb); | |
1da177e4 | 1933 | |
6eba6a37 | 1934 | if (!(flags & MSG_PEEK)) { |
1da177e4 | 1935 | if (UNIXCB(skb).fp) |
7cc05662 | 1936 | unix_detach_fds(&scm, skb); |
f55bb7f9 PE |
1937 | |
1938 | sk_peek_offset_bwd(sk, skb->len); | |
6eba6a37 | 1939 | } else { |
1da177e4 LT |
1940 | /* It is questionable: on PEEK we could: |
1941 | - do not return fds - good, but too simple 8) | |
1942 | - return fds, and do not return them on read (old strategy, | |
1943 | apparently wrong) | |
1944 | - clone fds (I chose it for now, it is the most universal | |
1945 | solution) | |
ac7bfa62 YH |
1946 | |
1947 | POSIX 1003.1g does not actually define this clearly | |
1948 | at all. POSIX 1003.1g doesn't define a lot of things | |
1949 | clearly however! | |
1950 | ||
1da177e4 | 1951 | */ |
f55bb7f9 PE |
1952 | |
1953 | sk_peek_offset_fwd(sk, size); | |
1954 | ||
1da177e4 | 1955 | if (UNIXCB(skb).fp) |
7cc05662 | 1956 | scm.fp = scm_fp_dup(UNIXCB(skb).fp); |
1da177e4 | 1957 | } |
9f6f9af7 | 1958 | err = (flags & MSG_TRUNC) ? skb->len - skip : size; |
1da177e4 | 1959 | |
7cc05662 | 1960 | scm_recv(sock, msg, &scm, flags); |
1da177e4 LT |
1961 | |
1962 | out_free: | |
6eba6a37 | 1963 | skb_free_datagram(sk, skb); |
1da177e4 | 1964 | out_unlock: |
57b47a53 | 1965 | mutex_unlock(&u->readlock); |
1da177e4 LT |
1966 | out: |
1967 | return err; | |
1968 | } | |
1969 | ||
1970 | /* | |
79f632c7 | 1971 | * Sleep until more data has arrived. But check for races.. |
1da177e4 | 1972 | */ |
79f632c7 | 1973 | static long unix_stream_data_wait(struct sock *sk, long timeo, |
2b514574 | 1974 | struct sk_buff *last, unsigned int last_len) |
1da177e4 | 1975 | { |
2b514574 | 1976 | struct sk_buff *tail; |
1da177e4 LT |
1977 | DEFINE_WAIT(wait); |
1978 | ||
1c92b4e5 | 1979 | unix_state_lock(sk); |
1da177e4 LT |
1980 | |
1981 | for (;;) { | |
aa395145 | 1982 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 | 1983 | |
2b514574 HFS |
1984 | tail = skb_peek_tail(&sk->sk_receive_queue); |
1985 | if (tail != last || | |
1986 | (tail && tail->len != last_len) || | |
1da177e4 LT |
1987 | sk->sk_err || |
1988 | (sk->sk_shutdown & RCV_SHUTDOWN) || | |
1989 | signal_pending(current) || | |
1990 | !timeo) | |
1991 | break; | |
1992 | ||
1993 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1c92b4e5 | 1994 | unix_state_unlock(sk); |
2b15af6f | 1995 | timeo = freezable_schedule_timeout(timeo); |
1c92b4e5 | 1996 | unix_state_lock(sk); |
b48732e4 MS |
1997 | |
1998 | if (sock_flag(sk, SOCK_DEAD)) | |
1999 | break; | |
2000 | ||
1da177e4 LT |
2001 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
2002 | } | |
2003 | ||
aa395145 | 2004 | finish_wait(sk_sleep(sk), &wait); |
1c92b4e5 | 2005 | unix_state_unlock(sk); |
1da177e4 LT |
2006 | return timeo; |
2007 | } | |
2008 | ||
e370a723 ED |
2009 | static unsigned int unix_skb_len(const struct sk_buff *skb) |
2010 | { | |
2011 | return skb->len - UNIXCB(skb).consumed; | |
2012 | } | |
2013 | ||
2b514574 HFS |
2014 | struct unix_stream_read_state { |
2015 | int (*recv_actor)(struct sk_buff *, int, int, | |
2016 | struct unix_stream_read_state *); | |
2017 | struct socket *socket; | |
2018 | struct msghdr *msg; | |
2019 | struct pipe_inode_info *pipe; | |
2020 | size_t size; | |
2021 | int flags; | |
2022 | unsigned int splice_flags; | |
2023 | }; | |
2024 | ||
2025 | static int unix_stream_read_generic(struct unix_stream_read_state *state) | |
1da177e4 | 2026 | { |
7cc05662 | 2027 | struct scm_cookie scm; |
2b514574 | 2028 | struct socket *sock = state->socket; |
1da177e4 LT |
2029 | struct sock *sk = sock->sk; |
2030 | struct unix_sock *u = unix_sk(sk); | |
1da177e4 | 2031 | int copied = 0; |
2b514574 | 2032 | int flags = state->flags; |
de144391 | 2033 | int noblock = flags & MSG_DONTWAIT; |
2b514574 | 2034 | bool check_creds = false; |
1da177e4 LT |
2035 | int target; |
2036 | int err = 0; | |
2037 | long timeo; | |
fc0d7536 | 2038 | int skip; |
2b514574 HFS |
2039 | size_t size = state->size; |
2040 | unsigned int last_len; | |
1da177e4 LT |
2041 | |
2042 | err = -EINVAL; | |
2043 | if (sk->sk_state != TCP_ESTABLISHED) | |
2044 | goto out; | |
2045 | ||
2046 | err = -EOPNOTSUPP; | |
2b514574 | 2047 | if (flags & MSG_OOB) |
1da177e4 LT |
2048 | goto out; |
2049 | ||
2b514574 | 2050 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, size); |
de144391 | 2051 | timeo = sock_rcvtimeo(sk, noblock); |
1da177e4 | 2052 | |
2b514574 HFS |
2053 | memset(&scm, 0, sizeof(scm)); |
2054 | ||
1da177e4 LT |
2055 | /* Lock the socket to prevent queue disordering |
2056 | * while sleeps in memcpy_tomsg | |
2057 | */ | |
b3ca9b02 | 2058 | err = mutex_lock_interruptible(&u->readlock); |
de144391 ED |
2059 | if (unlikely(err)) { |
2060 | /* recvmsg() in non blocking mode is supposed to return -EAGAIN | |
2061 | * sk_rcvtimeo is not honored by mutex_lock_interruptible() | |
2062 | */ | |
2063 | err = noblock ? -EAGAIN : -ERESTARTSYS; | |
b3ca9b02 RW |
2064 | goto out; |
2065 | } | |
1da177e4 | 2066 | |
6eba6a37 | 2067 | do { |
1da177e4 | 2068 | int chunk; |
79f632c7 | 2069 | struct sk_buff *skb, *last; |
1da177e4 | 2070 | |
3c0d2f37 | 2071 | unix_state_lock(sk); |
b48732e4 MS |
2072 | if (sock_flag(sk, SOCK_DEAD)) { |
2073 | err = -ECONNRESET; | |
2074 | goto unlock; | |
2075 | } | |
79f632c7 | 2076 | last = skb = skb_peek(&sk->sk_receive_queue); |
2b514574 | 2077 | last_len = last ? last->len : 0; |
fc0d7536 | 2078 | again: |
6eba6a37 | 2079 | if (skb == NULL) { |
25888e30 | 2080 | unix_sk(sk)->recursion_level = 0; |
1da177e4 | 2081 | if (copied >= target) |
3c0d2f37 | 2082 | goto unlock; |
1da177e4 LT |
2083 | |
2084 | /* | |
2085 | * POSIX 1003.1g mandates this order. | |
2086 | */ | |
ac7bfa62 | 2087 | |
6eba6a37 ED |
2088 | err = sock_error(sk); |
2089 | if (err) | |
3c0d2f37 | 2090 | goto unlock; |
1da177e4 | 2091 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
3c0d2f37 MS |
2092 | goto unlock; |
2093 | ||
2094 | unix_state_unlock(sk); | |
1da177e4 LT |
2095 | err = -EAGAIN; |
2096 | if (!timeo) | |
2097 | break; | |
57b47a53 | 2098 | mutex_unlock(&u->readlock); |
1da177e4 | 2099 | |
2b514574 HFS |
2100 | timeo = unix_stream_data_wait(sk, timeo, last, |
2101 | last_len); | |
1da177e4 | 2102 | |
2b514574 HFS |
2103 | if (signal_pending(current) || |
2104 | mutex_lock_interruptible(&u->readlock)) { | |
1da177e4 LT |
2105 | err = sock_intr_errno(timeo); |
2106 | goto out; | |
2107 | } | |
b3ca9b02 | 2108 | |
1da177e4 | 2109 | continue; |
2b514574 | 2110 | unlock: |
3c0d2f37 MS |
2111 | unix_state_unlock(sk); |
2112 | break; | |
1da177e4 | 2113 | } |
fc0d7536 | 2114 | |
79f632c7 | 2115 | skip = sk_peek_offset(sk, flags); |
e370a723 ED |
2116 | while (skip >= unix_skb_len(skb)) { |
2117 | skip -= unix_skb_len(skb); | |
79f632c7 | 2118 | last = skb; |
2b514574 | 2119 | last_len = skb->len; |
fc0d7536 | 2120 | skb = skb_peek_next(skb, &sk->sk_receive_queue); |
79f632c7 BP |
2121 | if (!skb) |
2122 | goto again; | |
fc0d7536 PE |
2123 | } |
2124 | ||
3c0d2f37 | 2125 | unix_state_unlock(sk); |
1da177e4 LT |
2126 | |
2127 | if (check_creds) { | |
2128 | /* Never glue messages from different writers */ | |
7cc05662 CH |
2129 | if ((UNIXCB(skb).pid != scm.pid) || |
2130 | !uid_eq(UNIXCB(skb).uid, scm.creds.uid) || | |
37a9a8df SS |
2131 | !gid_eq(UNIXCB(skb).gid, scm.creds.gid) || |
2132 | !unix_secdata_eq(&scm, skb)) | |
1da177e4 | 2133 | break; |
0e82e7f6 | 2134 | } else if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
1da177e4 | 2135 | /* Copy credentials */ |
7cc05662 | 2136 | scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); |
37a9a8df | 2137 | unix_set_secdata(&scm, skb); |
2b514574 | 2138 | check_creds = true; |
1da177e4 LT |
2139 | } |
2140 | ||
2141 | /* Copy address just once */ | |
2b514574 HFS |
2142 | if (state->msg && state->msg->msg_name) { |
2143 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, | |
2144 | state->msg->msg_name); | |
2145 | unix_copy_addr(state->msg, skb->sk); | |
1da177e4 LT |
2146 | sunaddr = NULL; |
2147 | } | |
2148 | ||
e370a723 | 2149 | chunk = min_t(unsigned int, unix_skb_len(skb) - skip, size); |
2b514574 HFS |
2150 | chunk = state->recv_actor(skb, skip, chunk, state); |
2151 | if (chunk < 0) { | |
1da177e4 LT |
2152 | if (copied == 0) |
2153 | copied = -EFAULT; | |
2154 | break; | |
2155 | } | |
2156 | copied += chunk; | |
2157 | size -= chunk; | |
2158 | ||
2159 | /* Mark read part of skb as used */ | |
6eba6a37 | 2160 | if (!(flags & MSG_PEEK)) { |
e370a723 | 2161 | UNIXCB(skb).consumed += chunk; |
1da177e4 | 2162 | |
fc0d7536 PE |
2163 | sk_peek_offset_bwd(sk, chunk); |
2164 | ||
1da177e4 | 2165 | if (UNIXCB(skb).fp) |
7cc05662 | 2166 | unix_detach_fds(&scm, skb); |
1da177e4 | 2167 | |
e370a723 | 2168 | if (unix_skb_len(skb)) |
1da177e4 | 2169 | break; |
1da177e4 | 2170 | |
6f01fd6e | 2171 | skb_unlink(skb, &sk->sk_receive_queue); |
70d4bf6d | 2172 | consume_skb(skb); |
1da177e4 | 2173 | |
7cc05662 | 2174 | if (scm.fp) |
1da177e4 | 2175 | break; |
6eba6a37 | 2176 | } else { |
1da177e4 LT |
2177 | /* It is questionable, see note in unix_dgram_recvmsg. |
2178 | */ | |
2179 | if (UNIXCB(skb).fp) | |
7cc05662 | 2180 | scm.fp = scm_fp_dup(UNIXCB(skb).fp); |
1da177e4 | 2181 | |
fc0d7536 PE |
2182 | sk_peek_offset_fwd(sk, chunk); |
2183 | ||
1da177e4 LT |
2184 | break; |
2185 | } | |
2186 | } while (size); | |
2187 | ||
57b47a53 | 2188 | mutex_unlock(&u->readlock); |
2b514574 HFS |
2189 | if (state->msg) |
2190 | scm_recv(sock, state->msg, &scm, flags); | |
2191 | else | |
2192 | scm_destroy(&scm); | |
1da177e4 LT |
2193 | out: |
2194 | return copied ? : err; | |
2195 | } | |
2196 | ||
2b514574 HFS |
2197 | static int unix_stream_read_actor(struct sk_buff *skb, |
2198 | int skip, int chunk, | |
2199 | struct unix_stream_read_state *state) | |
2200 | { | |
2201 | int ret; | |
2202 | ||
2203 | ret = skb_copy_datagram_msg(skb, UNIXCB(skb).consumed + skip, | |
2204 | state->msg, chunk); | |
2205 | return ret ?: chunk; | |
2206 | } | |
2207 | ||
2208 | static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg, | |
2209 | size_t size, int flags) | |
2210 | { | |
2211 | struct unix_stream_read_state state = { | |
2212 | .recv_actor = unix_stream_read_actor, | |
2213 | .socket = sock, | |
2214 | .msg = msg, | |
2215 | .size = size, | |
2216 | .flags = flags | |
2217 | }; | |
2218 | ||
2219 | return unix_stream_read_generic(&state); | |
2220 | } | |
2221 | ||
2222 | static ssize_t skb_unix_socket_splice(struct sock *sk, | |
2223 | struct pipe_inode_info *pipe, | |
2224 | struct splice_pipe_desc *spd) | |
2225 | { | |
2226 | int ret; | |
2227 | struct unix_sock *u = unix_sk(sk); | |
2228 | ||
2229 | mutex_unlock(&u->readlock); | |
2230 | ret = splice_to_pipe(pipe, spd); | |
2231 | mutex_lock(&u->readlock); | |
2232 | ||
2233 | return ret; | |
2234 | } | |
2235 | ||
2236 | static int unix_stream_splice_actor(struct sk_buff *skb, | |
2237 | int skip, int chunk, | |
2238 | struct unix_stream_read_state *state) | |
2239 | { | |
2240 | return skb_splice_bits(skb, state->socket->sk, | |
2241 | UNIXCB(skb).consumed + skip, | |
2242 | state->pipe, chunk, state->splice_flags, | |
2243 | skb_unix_socket_splice); | |
2244 | } | |
2245 | ||
2246 | static ssize_t unix_stream_splice_read(struct socket *sock, loff_t *ppos, | |
2247 | struct pipe_inode_info *pipe, | |
2248 | size_t size, unsigned int flags) | |
2249 | { | |
2250 | struct unix_stream_read_state state = { | |
2251 | .recv_actor = unix_stream_splice_actor, | |
2252 | .socket = sock, | |
2253 | .pipe = pipe, | |
2254 | .size = size, | |
2255 | .splice_flags = flags, | |
2256 | }; | |
2257 | ||
2258 | if (unlikely(*ppos)) | |
2259 | return -ESPIPE; | |
2260 | ||
2261 | if (sock->file->f_flags & O_NONBLOCK || | |
2262 | flags & SPLICE_F_NONBLOCK) | |
2263 | state.flags = MSG_DONTWAIT; | |
2264 | ||
2265 | return unix_stream_read_generic(&state); | |
2266 | } | |
2267 | ||
1da177e4 LT |
2268 | static int unix_shutdown(struct socket *sock, int mode) |
2269 | { | |
2270 | struct sock *sk = sock->sk; | |
2271 | struct sock *other; | |
2272 | ||
fc61b928 XW |
2273 | if (mode < SHUT_RD || mode > SHUT_RDWR) |
2274 | return -EINVAL; | |
2275 | /* This maps: | |
2276 | * SHUT_RD (0) -> RCV_SHUTDOWN (1) | |
2277 | * SHUT_WR (1) -> SEND_SHUTDOWN (2) | |
2278 | * SHUT_RDWR (2) -> SHUTDOWN_MASK (3) | |
2279 | */ | |
2280 | ++mode; | |
7180a031 AC |
2281 | |
2282 | unix_state_lock(sk); | |
2283 | sk->sk_shutdown |= mode; | |
2284 | other = unix_peer(sk); | |
2285 | if (other) | |
2286 | sock_hold(other); | |
2287 | unix_state_unlock(sk); | |
2288 | sk->sk_state_change(sk); | |
2289 | ||
2290 | if (other && | |
2291 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { | |
2292 | ||
2293 | int peer_mode = 0; | |
2294 | ||
2295 | if (mode&RCV_SHUTDOWN) | |
2296 | peer_mode |= SEND_SHUTDOWN; | |
2297 | if (mode&SEND_SHUTDOWN) | |
2298 | peer_mode |= RCV_SHUTDOWN; | |
2299 | unix_state_lock(other); | |
2300 | other->sk_shutdown |= peer_mode; | |
2301 | unix_state_unlock(other); | |
2302 | other->sk_state_change(other); | |
2303 | if (peer_mode == SHUTDOWN_MASK) | |
2304 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); | |
2305 | else if (peer_mode & RCV_SHUTDOWN) | |
2306 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); | |
1da177e4 | 2307 | } |
7180a031 AC |
2308 | if (other) |
2309 | sock_put(other); | |
2310 | ||
1da177e4 LT |
2311 | return 0; |
2312 | } | |
2313 | ||
885ee74d PE |
2314 | long unix_inq_len(struct sock *sk) |
2315 | { | |
2316 | struct sk_buff *skb; | |
2317 | long amount = 0; | |
2318 | ||
2319 | if (sk->sk_state == TCP_LISTEN) | |
2320 | return -EINVAL; | |
2321 | ||
2322 | spin_lock(&sk->sk_receive_queue.lock); | |
2323 | if (sk->sk_type == SOCK_STREAM || | |
2324 | sk->sk_type == SOCK_SEQPACKET) { | |
2325 | skb_queue_walk(&sk->sk_receive_queue, skb) | |
e370a723 | 2326 | amount += unix_skb_len(skb); |
885ee74d PE |
2327 | } else { |
2328 | skb = skb_peek(&sk->sk_receive_queue); | |
2329 | if (skb) | |
2330 | amount = skb->len; | |
2331 | } | |
2332 | spin_unlock(&sk->sk_receive_queue.lock); | |
2333 | ||
2334 | return amount; | |
2335 | } | |
2336 | EXPORT_SYMBOL_GPL(unix_inq_len); | |
2337 | ||
2338 | long unix_outq_len(struct sock *sk) | |
2339 | { | |
2340 | return sk_wmem_alloc_get(sk); | |
2341 | } | |
2342 | EXPORT_SYMBOL_GPL(unix_outq_len); | |
2343 | ||
1da177e4 LT |
2344 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
2345 | { | |
2346 | struct sock *sk = sock->sk; | |
e27dfcea | 2347 | long amount = 0; |
1da177e4 LT |
2348 | int err; |
2349 | ||
6eba6a37 ED |
2350 | switch (cmd) { |
2351 | case SIOCOUTQ: | |
885ee74d | 2352 | amount = unix_outq_len(sk); |
6eba6a37 ED |
2353 | err = put_user(amount, (int __user *)arg); |
2354 | break; | |
2355 | case SIOCINQ: | |
885ee74d PE |
2356 | amount = unix_inq_len(sk); |
2357 | if (amount < 0) | |
2358 | err = amount; | |
2359 | else | |
1da177e4 | 2360 | err = put_user(amount, (int __user *)arg); |
885ee74d | 2361 | break; |
6eba6a37 ED |
2362 | default: |
2363 | err = -ENOIOCTLCMD; | |
2364 | break; | |
1da177e4 LT |
2365 | } |
2366 | return err; | |
2367 | } | |
2368 | ||
6eba6a37 | 2369 | static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table *wait) |
1da177e4 LT |
2370 | { |
2371 | struct sock *sk = sock->sk; | |
2372 | unsigned int mask; | |
2373 | ||
aa395145 | 2374 | sock_poll_wait(file, sk_sleep(sk), wait); |
1da177e4 LT |
2375 | mask = 0; |
2376 | ||
2377 | /* exceptional events? */ | |
2378 | if (sk->sk_err) | |
2379 | mask |= POLLERR; | |
2380 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
2381 | mask |= POLLHUP; | |
f348d70a | 2382 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
db40980f | 2383 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
1da177e4 LT |
2384 | |
2385 | /* readable? */ | |
db40980f | 2386 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
2387 | mask |= POLLIN | POLLRDNORM; |
2388 | ||
2389 | /* Connection-based need to check for termination and startup */ | |
6eba6a37 ED |
2390 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
2391 | sk->sk_state == TCP_CLOSE) | |
1da177e4 LT |
2392 | mask |= POLLHUP; |
2393 | ||
2394 | /* | |
2395 | * we set writable also when the other side has shut down the | |
2396 | * connection. This prevents stuck sockets. | |
2397 | */ | |
2398 | if (unix_writable(sk)) | |
2399 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
2400 | ||
2401 | return mask; | |
2402 | } | |
2403 | ||
ec0d215f RW |
2404 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
2405 | poll_table *wait) | |
3c73419c | 2406 | { |
ec0d215f RW |
2407 | struct sock *sk = sock->sk, *other; |
2408 | unsigned int mask, writable; | |
3c73419c | 2409 | |
aa395145 | 2410 | sock_poll_wait(file, sk_sleep(sk), wait); |
3c73419c RW |
2411 | mask = 0; |
2412 | ||
2413 | /* exceptional events? */ | |
2414 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 2415 | mask |= POLLERR | |
8facd5fb | 2416 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
7d4c04fc | 2417 | |
3c73419c | 2418 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
5456f09a | 2419 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
3c73419c RW |
2420 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
2421 | mask |= POLLHUP; | |
2422 | ||
2423 | /* readable? */ | |
5456f09a | 2424 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
3c73419c RW |
2425 | mask |= POLLIN | POLLRDNORM; |
2426 | ||
2427 | /* Connection-based need to check for termination and startup */ | |
2428 | if (sk->sk_type == SOCK_SEQPACKET) { | |
2429 | if (sk->sk_state == TCP_CLOSE) | |
2430 | mask |= POLLHUP; | |
2431 | /* connection hasn't started yet? */ | |
2432 | if (sk->sk_state == TCP_SYN_SENT) | |
2433 | return mask; | |
2434 | } | |
2435 | ||
973a34aa | 2436 | /* No write status requested, avoid expensive OUT tests. */ |
626cf236 | 2437 | if (!(poll_requested_events(wait) & (POLLWRBAND|POLLWRNORM|POLLOUT))) |
973a34aa ED |
2438 | return mask; |
2439 | ||
ec0d215f | 2440 | writable = unix_writable(sk); |
5456f09a ED |
2441 | other = unix_peer_get(sk); |
2442 | if (other) { | |
2443 | if (unix_peer(other) != sk) { | |
2444 | sock_poll_wait(file, &unix_sk(other)->peer_wait, wait); | |
2445 | if (unix_recvq_full(other)) | |
2446 | writable = 0; | |
ec0d215f | 2447 | } |
5456f09a | 2448 | sock_put(other); |
ec0d215f RW |
2449 | } |
2450 | ||
2451 | if (writable) | |
3c73419c RW |
2452 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
2453 | else | |
2454 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
2455 | ||
3c73419c RW |
2456 | return mask; |
2457 | } | |
1da177e4 LT |
2458 | |
2459 | #ifdef CONFIG_PROC_FS | |
a53eb3fe | 2460 | |
7123aaa3 ED |
2461 | #define BUCKET_SPACE (BITS_PER_LONG - (UNIX_HASH_BITS + 1) - 1) |
2462 | ||
2463 | #define get_bucket(x) ((x) >> BUCKET_SPACE) | |
2464 | #define get_offset(x) ((x) & ((1L << BUCKET_SPACE) - 1)) | |
2465 | #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) | |
a53eb3fe | 2466 | |
7123aaa3 | 2467 | static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos) |
1da177e4 | 2468 | { |
7123aaa3 ED |
2469 | unsigned long offset = get_offset(*pos); |
2470 | unsigned long bucket = get_bucket(*pos); | |
2471 | struct sock *sk; | |
2472 | unsigned long count = 0; | |
1da177e4 | 2473 | |
7123aaa3 ED |
2474 | for (sk = sk_head(&unix_socket_table[bucket]); sk; sk = sk_next(sk)) { |
2475 | if (sock_net(sk) != seq_file_net(seq)) | |
097e66c5 | 2476 | continue; |
7123aaa3 ED |
2477 | if (++count == offset) |
2478 | break; | |
2479 | } | |
2480 | ||
2481 | return sk; | |
2482 | } | |
2483 | ||
2484 | static struct sock *unix_next_socket(struct seq_file *seq, | |
2485 | struct sock *sk, | |
2486 | loff_t *pos) | |
2487 | { | |
2488 | unsigned long bucket; | |
2489 | ||
2490 | while (sk > (struct sock *)SEQ_START_TOKEN) { | |
2491 | sk = sk_next(sk); | |
2492 | if (!sk) | |
2493 | goto next_bucket; | |
2494 | if (sock_net(sk) == seq_file_net(seq)) | |
2495 | return sk; | |
1da177e4 | 2496 | } |
7123aaa3 ED |
2497 | |
2498 | do { | |
2499 | sk = unix_from_bucket(seq, pos); | |
2500 | if (sk) | |
2501 | return sk; | |
2502 | ||
2503 | next_bucket: | |
2504 | bucket = get_bucket(*pos) + 1; | |
2505 | *pos = set_bucket_offset(bucket, 1); | |
2506 | } while (bucket < ARRAY_SIZE(unix_socket_table)); | |
2507 | ||
1da177e4 LT |
2508 | return NULL; |
2509 | } | |
2510 | ||
1da177e4 | 2511 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2512 | __acquires(unix_table_lock) |
1da177e4 | 2513 | { |
fbe9cc4a | 2514 | spin_lock(&unix_table_lock); |
7123aaa3 ED |
2515 | |
2516 | if (!*pos) | |
2517 | return SEQ_START_TOKEN; | |
2518 | ||
2519 | if (get_bucket(*pos) >= ARRAY_SIZE(unix_socket_table)) | |
2520 | return NULL; | |
2521 | ||
2522 | return unix_next_socket(seq, NULL, pos); | |
1da177e4 LT |
2523 | } |
2524 | ||
2525 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2526 | { | |
2527 | ++*pos; | |
7123aaa3 | 2528 | return unix_next_socket(seq, v, pos); |
1da177e4 LT |
2529 | } |
2530 | ||
2531 | static void unix_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2532 | __releases(unix_table_lock) |
1da177e4 | 2533 | { |
fbe9cc4a | 2534 | spin_unlock(&unix_table_lock); |
1da177e4 LT |
2535 | } |
2536 | ||
2537 | static int unix_seq_show(struct seq_file *seq, void *v) | |
2538 | { | |
ac7bfa62 | 2539 | |
b9f3124f | 2540 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2541 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
2542 | "Inode Path\n"); | |
2543 | else { | |
2544 | struct sock *s = v; | |
2545 | struct unix_sock *u = unix_sk(s); | |
1c92b4e5 | 2546 | unix_state_lock(s); |
1da177e4 | 2547 | |
71338aa7 | 2548 | seq_printf(seq, "%pK: %08X %08X %08X %04X %02X %5lu", |
1da177e4 LT |
2549 | s, |
2550 | atomic_read(&s->sk_refcnt), | |
2551 | 0, | |
2552 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, | |
2553 | s->sk_type, | |
2554 | s->sk_socket ? | |
2555 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : | |
2556 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), | |
2557 | sock_i_ino(s)); | |
2558 | ||
2559 | if (u->addr) { | |
2560 | int i, len; | |
2561 | seq_putc(seq, ' '); | |
2562 | ||
2563 | i = 0; | |
2564 | len = u->addr->len - sizeof(short); | |
2565 | if (!UNIX_ABSTRACT(s)) | |
2566 | len--; | |
2567 | else { | |
2568 | seq_putc(seq, '@'); | |
2569 | i++; | |
2570 | } | |
2571 | for ( ; i < len; i++) | |
2572 | seq_putc(seq, u->addr->name->sun_path[i]); | |
2573 | } | |
1c92b4e5 | 2574 | unix_state_unlock(s); |
1da177e4 LT |
2575 | seq_putc(seq, '\n'); |
2576 | } | |
2577 | ||
2578 | return 0; | |
2579 | } | |
2580 | ||
56b3d975 | 2581 | static const struct seq_operations unix_seq_ops = { |
1da177e4 LT |
2582 | .start = unix_seq_start, |
2583 | .next = unix_seq_next, | |
2584 | .stop = unix_seq_stop, | |
2585 | .show = unix_seq_show, | |
2586 | }; | |
2587 | ||
1da177e4 LT |
2588 | static int unix_seq_open(struct inode *inode, struct file *file) |
2589 | { | |
e372c414 | 2590 | return seq_open_net(inode, file, &unix_seq_ops, |
8b51b064 | 2591 | sizeof(struct seq_net_private)); |
1da177e4 LT |
2592 | } |
2593 | ||
da7071d7 | 2594 | static const struct file_operations unix_seq_fops = { |
1da177e4 LT |
2595 | .owner = THIS_MODULE, |
2596 | .open = unix_seq_open, | |
2597 | .read = seq_read, | |
2598 | .llseek = seq_lseek, | |
e372c414 | 2599 | .release = seq_release_net, |
1da177e4 LT |
2600 | }; |
2601 | ||
2602 | #endif | |
2603 | ||
ec1b4cf7 | 2604 | static const struct net_proto_family unix_family_ops = { |
1da177e4 LT |
2605 | .family = PF_UNIX, |
2606 | .create = unix_create, | |
2607 | .owner = THIS_MODULE, | |
2608 | }; | |
2609 | ||
097e66c5 | 2610 | |
2c8c1e72 | 2611 | static int __net_init unix_net_init(struct net *net) |
097e66c5 DL |
2612 | { |
2613 | int error = -ENOMEM; | |
2614 | ||
a0a53c8b | 2615 | net->unx.sysctl_max_dgram_qlen = 10; |
1597fbc0 PE |
2616 | if (unix_sysctl_register(net)) |
2617 | goto out; | |
d392e497 | 2618 | |
097e66c5 | 2619 | #ifdef CONFIG_PROC_FS |
d4beaa66 | 2620 | if (!proc_create("unix", 0, net->proc_net, &unix_seq_fops)) { |
1597fbc0 | 2621 | unix_sysctl_unregister(net); |
097e66c5 | 2622 | goto out; |
1597fbc0 | 2623 | } |
097e66c5 DL |
2624 | #endif |
2625 | error = 0; | |
2626 | out: | |
48dcc33e | 2627 | return error; |
097e66c5 DL |
2628 | } |
2629 | ||
2c8c1e72 | 2630 | static void __net_exit unix_net_exit(struct net *net) |
097e66c5 | 2631 | { |
1597fbc0 | 2632 | unix_sysctl_unregister(net); |
ece31ffd | 2633 | remove_proc_entry("unix", net->proc_net); |
097e66c5 DL |
2634 | } |
2635 | ||
2636 | static struct pernet_operations unix_net_ops = { | |
2637 | .init = unix_net_init, | |
2638 | .exit = unix_net_exit, | |
2639 | }; | |
2640 | ||
1da177e4 LT |
2641 | static int __init af_unix_init(void) |
2642 | { | |
2643 | int rc = -1; | |
1da177e4 | 2644 | |
b4fff5f8 | 2645 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
1da177e4 LT |
2646 | |
2647 | rc = proto_register(&unix_proto, 1); | |
ac7bfa62 | 2648 | if (rc != 0) { |
5cc208be | 2649 | pr_crit("%s: Cannot create unix_sock SLAB cache!\n", __func__); |
1da177e4 LT |
2650 | goto out; |
2651 | } | |
2652 | ||
2653 | sock_register(&unix_family_ops); | |
097e66c5 | 2654 | register_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2655 | out: |
2656 | return rc; | |
2657 | } | |
2658 | ||
2659 | static void __exit af_unix_exit(void) | |
2660 | { | |
2661 | sock_unregister(PF_UNIX); | |
1da177e4 | 2662 | proto_unregister(&unix_proto); |
097e66c5 | 2663 | unregister_pernet_subsys(&unix_net_ops); |
1da177e4 LT |
2664 | } |
2665 | ||
3d366960 DW |
2666 | /* Earlier than device_initcall() so that other drivers invoking |
2667 | request_module() don't end up in a loop when modprobe tries | |
2668 | to use a UNIX socket. But later than subsys_initcall() because | |
2669 | we depend on stuff initialised there */ | |
2670 | fs_initcall(af_unix_init); | |
1da177e4 LT |
2671 | module_exit(af_unix_exit); |
2672 | ||
2673 | MODULE_LICENSE("GPL"); | |
2674 | MODULE_ALIAS_NETPROTO(PF_UNIX); |