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1 | /* |
2 | * File: socket.c |
3 | * |
4 | * Phonet sockets |
5 | * |
6 | * Copyright (C) 2008 Nokia Corporation. |
7 | * |
8 | * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com> |
9 | * Original author: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * |
11 | * This program is free software; you can redistribute it and/or |
12 | * modify it under the terms of the GNU General Public License |
13 | * version 2 as published by the Free Software Foundation. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, but |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
18 | * General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
23 | * 02110-1301 USA |
24 | */ |
25 | |
26 | #include <linux/gfp.h> |
27 | #include <linux/kernel.h> |
28 | #include <linux/net.h> |
29 | #include <linux/poll.h> |
30 | #include <net/sock.h> |
31 | #include <net/tcp_states.h> |
32 | |
33 | #include <linux/phonet.h> |
34 | #include <net/phonet/phonet.h> |
35 | #include <net/phonet/pep.h> |
36 | #include <net/phonet/pn_dev.h> |
37 | |
38 | static int pn_socket_release(struct socket *sock) |
39 | { |
40 | struct sock *sk = sock->sk; |
41 | |
42 | if (sk) { |
43 | sock->sk = NULL; |
44 | sk->sk_prot->close(sk, 0); |
45 | } |
46 | return 0; |
47 | } |
48 | |
49 | #define PN_HASHSIZE 16 |
50 | #define PN_HASHMASK (PN_HASHSIZE-1) |
51 | |
52 | |
53 | static struct { |
54 | struct hlist_head hlist[PN_HASHSIZE]; |
55 | spinlock_t lock; |
56 | } pnsocks; |
57 | |
58 | void __init pn_sock_init(void) |
59 | { |
60 | unsigned i; |
61 | |
62 | for (i = 0; i < PN_HASHSIZE; i++) |
63 | INIT_HLIST_HEAD(pnsocks.hlist + i); |
64 | spin_lock_init(&pnsocks.lock); |
65 | } |
66 | |
67 | static struct hlist_head *pn_hash_list(u16 obj) |
68 | { |
69 | return pnsocks.hlist + (obj & PN_HASHMASK); |
70 | } |
71 | |
72 | /* |
73 | * Find address based on socket address, match only certain fields. |
74 | * Also grab sock if it was found. Remember to sock_put it later. |
75 | */ |
76 | struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn) |
77 | { |
78 | struct hlist_node *node; |
79 | struct sock *sknode; |
80 | struct sock *rval = NULL; |
81 | u16 obj = pn_sockaddr_get_object(spn); |
82 | u8 res = spn->spn_resource; |
83 | struct hlist_head *hlist = pn_hash_list(obj); |
84 | |
85 | spin_lock_bh(&pnsocks.lock); |
86 | |
87 | sk_for_each(sknode, node, hlist) { |
88 | struct pn_sock *pn = pn_sk(sknode); |
89 | BUG_ON(!pn->sobject); /* unbound socket */ |
90 | |
91 | if (!net_eq(sock_net(sknode), net)) |
92 | continue; |
93 | if (pn_port(obj)) { |
94 | /* Look up socket by port */ |
95 | if (pn_port(pn->sobject) != pn_port(obj)) |
96 | continue; |
97 | } else { |
98 | /* If port is zero, look up by resource */ |
99 | if (pn->resource != res) |
100 | continue; |
101 | } |
102 | if (pn_addr(pn->sobject) && |
103 | pn_addr(pn->sobject) != pn_addr(obj)) |
104 | continue; |
105 | |
106 | rval = sknode; |
107 | sock_hold(sknode); |
108 | break; |
109 | } |
110 | |
111 | spin_unlock_bh(&pnsocks.lock); |
112 | |
113 | return rval; |
114 | } |
115 | |
116 | /* Deliver a broadcast packet (only in bottom-half) */ |
117 | void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb) |
118 | { |
119 | struct hlist_head *hlist = pnsocks.hlist; |
120 | unsigned h; |
121 | |
122 | spin_lock(&pnsocks.lock); |
123 | for (h = 0; h < PN_HASHSIZE; h++) { |
124 | struct hlist_node *node; |
125 | struct sock *sknode; |
126 | |
127 | sk_for_each(sknode, node, hlist) { |
128 | struct sk_buff *clone; |
129 | |
130 | if (!net_eq(sock_net(sknode), net)) |
131 | continue; |
132 | if (!sock_flag(sknode, SOCK_BROADCAST)) |
133 | continue; |
134 | |
135 | clone = skb_clone(skb, GFP_ATOMIC); |
136 | if (clone) { |
137 | sock_hold(sknode); |
138 | sk_receive_skb(sknode, clone, 0); |
139 | } |
140 | } |
141 | hlist++; |
142 | } |
143 | spin_unlock(&pnsocks.lock); |
144 | } |
145 | |
146 | void pn_sock_hash(struct sock *sk) |
147 | { |
148 | struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject); |
149 | |
150 | spin_lock_bh(&pnsocks.lock); |
151 | sk_add_node(sk, hlist); |
152 | spin_unlock_bh(&pnsocks.lock); |
153 | } |
154 | EXPORT_SYMBOL(pn_sock_hash); |
155 | |
156 | void pn_sock_unhash(struct sock *sk) |
157 | { |
158 | spin_lock_bh(&pnsocks.lock); |
159 | sk_del_node_init(sk); |
160 | spin_unlock_bh(&pnsocks.lock); |
161 | pn_sock_unbind_all_res(sk); |
162 | } |
163 | EXPORT_SYMBOL(pn_sock_unhash); |
164 | |
165 | static DEFINE_MUTEX(port_mutex); |
166 | |
167 | static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len) |
168 | { |
169 | struct sock *sk = sock->sk; |
170 | struct pn_sock *pn = pn_sk(sk); |
171 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
172 | int err; |
173 | u16 handle; |
174 | u8 saddr; |
175 | |
176 | if (sk->sk_prot->bind) |
177 | return sk->sk_prot->bind(sk, addr, len); |
178 | |
179 | if (len < sizeof(struct sockaddr_pn)) |
180 | return -EINVAL; |
181 | if (spn->spn_family != AF_PHONET) |
182 | return -EAFNOSUPPORT; |
183 | |
184 | handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr); |
185 | saddr = pn_addr(handle); |
186 | if (saddr && phonet_address_lookup(sock_net(sk), saddr)) |
187 | return -EADDRNOTAVAIL; |
188 | |
189 | lock_sock(sk); |
190 | if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) { |
191 | err = -EINVAL; /* attempt to rebind */ |
192 | goto out; |
193 | } |
194 | WARN_ON(sk_hashed(sk)); |
195 | mutex_lock(&port_mutex); |
196 | err = sk->sk_prot->get_port(sk, pn_port(handle)); |
197 | if (err) |
198 | goto out_port; |
199 | |
200 | /* get_port() sets the port, bind() sets the address if applicable */ |
201 | pn->sobject = pn_object(saddr, pn_port(pn->sobject)); |
202 | pn->resource = spn->spn_resource; |
203 | |
204 | /* Enable RX on the socket */ |
205 | sk->sk_prot->hash(sk); |
206 | out_port: |
207 | mutex_unlock(&port_mutex); |
208 | out: |
209 | release_sock(sk); |
210 | return err; |
211 | } |
212 | |
213 | static int pn_socket_autobind(struct socket *sock) |
214 | { |
215 | struct sockaddr_pn sa; |
216 | int err; |
217 | |
218 | memset(&sa, 0, sizeof(sa)); |
219 | sa.spn_family = AF_PHONET; |
220 | err = pn_socket_bind(sock, (struct sockaddr *)&sa, |
221 | sizeof(struct sockaddr_pn)); |
222 | if (err != -EINVAL) |
223 | return err; |
224 | BUG_ON(!pn_port(pn_sk(sock->sk)->sobject)); |
225 | return 0; /* socket was already bound */ |
226 | } |
227 | |
228 | #ifdef CONFIG_PHONET_PIPECTRLR |
229 | static int pn_socket_connect(struct socket *sock, struct sockaddr *addr, |
230 | int len, int flags) |
231 | { |
232 | struct sock *sk = sock->sk; |
233 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
234 | long timeo; |
235 | int err; |
236 | |
237 | if (len < sizeof(struct sockaddr_pn)) |
238 | return -EINVAL; |
239 | if (spn->spn_family != AF_PHONET) |
240 | return -EAFNOSUPPORT; |
241 | |
242 | lock_sock(sk); |
243 | |
244 | switch (sock->state) { |
245 | case SS_UNCONNECTED: |
246 | sk->sk_state = TCP_CLOSE; |
247 | break; |
248 | case SS_CONNECTING: |
249 | switch (sk->sk_state) { |
250 | case TCP_SYN_RECV: |
251 | sock->state = SS_CONNECTED; |
252 | err = -EISCONN; |
253 | goto out; |
254 | case TCP_CLOSE: |
255 | err = -EALREADY; |
256 | if (flags & O_NONBLOCK) |
257 | goto out; |
258 | goto wait_connect; |
259 | } |
260 | break; |
261 | case SS_CONNECTED: |
262 | switch (sk->sk_state) { |
263 | case TCP_SYN_RECV: |
264 | err = -EISCONN; |
265 | goto out; |
266 | case TCP_CLOSE: |
267 | sock->state = SS_UNCONNECTED; |
268 | break; |
269 | } |
270 | break; |
271 | case SS_DISCONNECTING: |
272 | case SS_FREE: |
273 | break; |
274 | } |
275 | sk->sk_state = TCP_CLOSE; |
276 | sk_stream_kill_queues(sk); |
277 | |
278 | sock->state = SS_CONNECTING; |
279 | err = sk->sk_prot->connect(sk, addr, len); |
280 | if (err < 0) { |
281 | sock->state = SS_UNCONNECTED; |
282 | sk->sk_state = TCP_CLOSE; |
283 | goto out; |
284 | } |
285 | |
286 | err = -EINPROGRESS; |
287 | wait_connect: |
288 | if (sk->sk_state != TCP_SYN_RECV && (flags & O_NONBLOCK)) |
289 | goto out; |
290 | |
291 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
292 | release_sock(sk); |
293 | |
294 | err = -ERESTARTSYS; |
295 | timeo = wait_event_interruptible_timeout(*sk_sleep(sk), |
296 | sk->sk_state != TCP_CLOSE, |
297 | timeo); |
298 | |
299 | lock_sock(sk); |
300 | if (timeo < 0) |
301 | goto out; /* -ERESTARTSYS */ |
302 | |
303 | err = -ETIMEDOUT; |
304 | if (timeo == 0 && sk->sk_state != TCP_SYN_RECV) |
305 | goto out; |
306 | |
307 | if (sk->sk_state != TCP_SYN_RECV) { |
308 | sock->state = SS_UNCONNECTED; |
309 | err = sock_error(sk); |
310 | if (!err) |
311 | err = -ECONNREFUSED; |
312 | goto out; |
313 | } |
314 | sock->state = SS_CONNECTED; |
315 | err = 0; |
316 | |
317 | out: |
318 | release_sock(sk); |
319 | return err; |
320 | } |
321 | #endif |
322 | |
323 | static int pn_socket_accept(struct socket *sock, struct socket *newsock, |
324 | int flags) |
325 | { |
326 | struct sock *sk = sock->sk; |
327 | struct sock *newsk; |
328 | int err; |
329 | |
330 | newsk = sk->sk_prot->accept(sk, flags, &err); |
331 | if (!newsk) |
332 | return err; |
333 | |
334 | lock_sock(newsk); |
335 | sock_graft(newsk, newsock); |
336 | newsock->state = SS_CONNECTED; |
337 | release_sock(newsk); |
338 | return 0; |
339 | } |
340 | |
341 | static int pn_socket_getname(struct socket *sock, struct sockaddr *addr, |
342 | int *sockaddr_len, int peer) |
343 | { |
344 | struct sock *sk = sock->sk; |
345 | struct pn_sock *pn = pn_sk(sk); |
346 | |
347 | memset(addr, 0, sizeof(struct sockaddr_pn)); |
348 | addr->sa_family = AF_PHONET; |
349 | if (!peer) /* Race with bind() here is userland's problem. */ |
350 | pn_sockaddr_set_object((struct sockaddr_pn *)addr, |
351 | pn->sobject); |
352 | |
353 | *sockaddr_len = sizeof(struct sockaddr_pn); |
354 | return 0; |
355 | } |
356 | |
357 | static unsigned int pn_socket_poll(struct file *file, struct socket *sock, |
358 | poll_table *wait) |
359 | { |
360 | struct sock *sk = sock->sk; |
361 | struct pep_sock *pn = pep_sk(sk); |
362 | unsigned int mask = 0; |
363 | |
364 | poll_wait(file, sk_sleep(sk), wait); |
365 | |
366 | switch (sk->sk_state) { |
367 | case TCP_LISTEN: |
368 | return hlist_empty(&pn->ackq) ? 0 : POLLIN; |
369 | case TCP_CLOSE: |
370 | return POLLERR; |
371 | } |
372 | |
373 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
374 | mask |= POLLIN | POLLRDNORM; |
375 | if (!skb_queue_empty(&pn->ctrlreq_queue)) |
376 | mask |= POLLPRI; |
377 | if (!mask && sk->sk_state == TCP_CLOSE_WAIT) |
378 | return POLLHUP; |
379 | |
380 | if (sk->sk_state == TCP_ESTABLISHED && |
381 | atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && |
382 | atomic_read(&pn->tx_credits)) |
383 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
384 | |
385 | return mask; |
386 | } |
387 | |
388 | static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, |
389 | unsigned long arg) |
390 | { |
391 | struct sock *sk = sock->sk; |
392 | struct pn_sock *pn = pn_sk(sk); |
393 | |
394 | if (cmd == SIOCPNGETOBJECT) { |
395 | struct net_device *dev; |
396 | u16 handle; |
397 | u8 saddr; |
398 | |
399 | if (get_user(handle, (__u16 __user *)arg)) |
400 | return -EFAULT; |
401 | |
402 | lock_sock(sk); |
403 | if (sk->sk_bound_dev_if) |
404 | dev = dev_get_by_index(sock_net(sk), |
405 | sk->sk_bound_dev_if); |
406 | else |
407 | dev = phonet_device_get(sock_net(sk)); |
408 | if (dev && (dev->flags & IFF_UP)) |
409 | saddr = phonet_address_get(dev, pn_addr(handle)); |
410 | else |
411 | saddr = PN_NO_ADDR; |
412 | release_sock(sk); |
413 | |
414 | if (dev) |
415 | dev_put(dev); |
416 | if (saddr == PN_NO_ADDR) |
417 | return -EHOSTUNREACH; |
418 | |
419 | handle = pn_object(saddr, pn_port(pn->sobject)); |
420 | return put_user(handle, (__u16 __user *)arg); |
421 | } |
422 | |
423 | return sk->sk_prot->ioctl(sk, cmd, arg); |
424 | } |
425 | |
426 | static int pn_socket_listen(struct socket *sock, int backlog) |
427 | { |
428 | struct sock *sk = sock->sk; |
429 | int err = 0; |
430 | |
431 | if (sock->state != SS_UNCONNECTED) |
432 | return -EINVAL; |
433 | if (pn_socket_autobind(sock)) |
434 | return -ENOBUFS; |
435 | |
436 | lock_sock(sk); |
437 | if (sk->sk_state != TCP_CLOSE) { |
438 | err = -EINVAL; |
439 | goto out; |
440 | } |
441 | |
442 | sk->sk_state = TCP_LISTEN; |
443 | sk->sk_ack_backlog = 0; |
444 | sk->sk_max_ack_backlog = backlog; |
445 | out: |
446 | release_sock(sk); |
447 | return err; |
448 | } |
449 | |
450 | static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock, |
451 | struct msghdr *m, size_t total_len) |
452 | { |
453 | struct sock *sk = sock->sk; |
454 | |
455 | if (pn_socket_autobind(sock)) |
456 | return -EAGAIN; |
457 | |
458 | return sk->sk_prot->sendmsg(iocb, sk, m, total_len); |
459 | } |
460 | |
461 | const struct proto_ops phonet_dgram_ops = { |
462 | .family = AF_PHONET, |
463 | .owner = THIS_MODULE, |
464 | .release = pn_socket_release, |
465 | .bind = pn_socket_bind, |
466 | .connect = sock_no_connect, |
467 | .socketpair = sock_no_socketpair, |
468 | .accept = sock_no_accept, |
469 | .getname = pn_socket_getname, |
470 | .poll = datagram_poll, |
471 | .ioctl = pn_socket_ioctl, |
472 | .listen = sock_no_listen, |
473 | .shutdown = sock_no_shutdown, |
474 | .setsockopt = sock_no_setsockopt, |
475 | .getsockopt = sock_no_getsockopt, |
476 | #ifdef CONFIG_COMPAT |
477 | .compat_setsockopt = sock_no_setsockopt, |
478 | .compat_getsockopt = sock_no_getsockopt, |
479 | #endif |
480 | .sendmsg = pn_socket_sendmsg, |
481 | .recvmsg = sock_common_recvmsg, |
482 | .mmap = sock_no_mmap, |
483 | .sendpage = sock_no_sendpage, |
484 | }; |
485 | |
486 | const struct proto_ops phonet_stream_ops = { |
487 | .family = AF_PHONET, |
488 | .owner = THIS_MODULE, |
489 | .release = pn_socket_release, |
490 | .bind = pn_socket_bind, |
491 | #ifdef CONFIG_PHONET_PIPECTRLR |
492 | .connect = pn_socket_connect, |
493 | #else |
494 | .connect = sock_no_connect, |
495 | #endif |
496 | .socketpair = sock_no_socketpair, |
497 | .accept = pn_socket_accept, |
498 | .getname = pn_socket_getname, |
499 | .poll = pn_socket_poll, |
500 | .ioctl = pn_socket_ioctl, |
501 | .listen = pn_socket_listen, |
502 | .shutdown = sock_no_shutdown, |
503 | .setsockopt = sock_common_setsockopt, |
504 | .getsockopt = sock_common_getsockopt, |
505 | #ifdef CONFIG_COMPAT |
506 | .compat_setsockopt = compat_sock_common_setsockopt, |
507 | .compat_getsockopt = compat_sock_common_getsockopt, |
508 | #endif |
509 | .sendmsg = pn_socket_sendmsg, |
510 | .recvmsg = sock_common_recvmsg, |
511 | .mmap = sock_no_mmap, |
512 | .sendpage = sock_no_sendpage, |
513 | }; |
514 | EXPORT_SYMBOL(phonet_stream_ops); |
515 | |
516 | /* allocate port for a socket */ |
517 | int pn_sock_get_port(struct sock *sk, unsigned short sport) |
518 | { |
519 | static int port_cur; |
520 | struct net *net = sock_net(sk); |
521 | struct pn_sock *pn = pn_sk(sk); |
522 | struct sockaddr_pn try_sa; |
523 | struct sock *tmpsk; |
524 | |
525 | memset(&try_sa, 0, sizeof(struct sockaddr_pn)); |
526 | try_sa.spn_family = AF_PHONET; |
527 | WARN_ON(!mutex_is_locked(&port_mutex)); |
528 | if (!sport) { |
529 | /* search free port */ |
530 | int port, pmin, pmax; |
531 | |
532 | phonet_get_local_port_range(&pmin, &pmax); |
533 | for (port = pmin; port <= pmax; port++) { |
534 | port_cur++; |
535 | if (port_cur < pmin || port_cur > pmax) |
536 | port_cur = pmin; |
537 | |
538 | pn_sockaddr_set_port(&try_sa, port_cur); |
539 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
540 | if (tmpsk == NULL) { |
541 | sport = port_cur; |
542 | goto found; |
543 | } else |
544 | sock_put(tmpsk); |
545 | } |
546 | } else { |
547 | /* try to find specific port */ |
548 | pn_sockaddr_set_port(&try_sa, sport); |
549 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
550 | if (tmpsk == NULL) |
551 | /* No sock there! We can use that port... */ |
552 | goto found; |
553 | else |
554 | sock_put(tmpsk); |
555 | } |
556 | /* the port must be in use already */ |
557 | return -EADDRINUSE; |
558 | |
559 | found: |
560 | pn->sobject = pn_object(pn_addr(pn->sobject), sport); |
561 | return 0; |
562 | } |
563 | EXPORT_SYMBOL(pn_sock_get_port); |
564 | |
565 | #ifdef CONFIG_PROC_FS |
566 | static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) |
567 | { |
568 | struct net *net = seq_file_net(seq); |
569 | struct hlist_head *hlist = pnsocks.hlist; |
570 | struct hlist_node *node; |
571 | struct sock *sknode; |
572 | unsigned h; |
573 | |
574 | for (h = 0; h < PN_HASHSIZE; h++) { |
575 | sk_for_each(sknode, node, hlist) { |
576 | if (!net_eq(net, sock_net(sknode))) |
577 | continue; |
578 | if (!pos) |
579 | return sknode; |
580 | pos--; |
581 | } |
582 | hlist++; |
583 | } |
584 | return NULL; |
585 | } |
586 | |
587 | static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) |
588 | { |
589 | struct net *net = seq_file_net(seq); |
590 | |
591 | do |
592 | sk = sk_next(sk); |
593 | while (sk && !net_eq(net, sock_net(sk))); |
594 | |
595 | return sk; |
596 | } |
597 | |
598 | static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) |
599 | __acquires(pnsocks.lock) |
600 | { |
601 | spin_lock_bh(&pnsocks.lock); |
602 | return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
603 | } |
604 | |
605 | static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
606 | { |
607 | struct sock *sk; |
608 | |
609 | if (v == SEQ_START_TOKEN) |
610 | sk = pn_sock_get_idx(seq, 0); |
611 | else |
612 | sk = pn_sock_get_next(seq, v); |
613 | (*pos)++; |
614 | return sk; |
615 | } |
616 | |
617 | static void pn_sock_seq_stop(struct seq_file *seq, void *v) |
618 | __releases(pnsocks.lock) |
619 | { |
620 | spin_unlock_bh(&pnsocks.lock); |
621 | } |
622 | |
623 | static int pn_sock_seq_show(struct seq_file *seq, void *v) |
624 | { |
625 | int len; |
626 | |
627 | if (v == SEQ_START_TOKEN) |
628 | seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue " |
629 | " uid inode ref pointer drops", &len); |
630 | else { |
631 | struct sock *sk = v; |
632 | struct pn_sock *pn = pn_sk(sk); |
633 | |
634 | seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " |
635 | "%d %p %d%n", |
636 | sk->sk_protocol, pn->sobject, 0, pn->resource, |
637 | sk->sk_state, |
638 | sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), |
639 | sock_i_uid(sk), sock_i_ino(sk), |
640 | atomic_read(&sk->sk_refcnt), sk, |
641 | atomic_read(&sk->sk_drops), &len); |
642 | } |
643 | seq_printf(seq, "%*s\n", 127 - len, ""); |
644 | return 0; |
645 | } |
646 | |
647 | static const struct seq_operations pn_sock_seq_ops = { |
648 | .start = pn_sock_seq_start, |
649 | .next = pn_sock_seq_next, |
650 | .stop = pn_sock_seq_stop, |
651 | .show = pn_sock_seq_show, |
652 | }; |
653 | |
654 | static int pn_sock_open(struct inode *inode, struct file *file) |
655 | { |
656 | return seq_open_net(inode, file, &pn_sock_seq_ops, |
657 | sizeof(struct seq_net_private)); |
658 | } |
659 | |
660 | const struct file_operations pn_sock_seq_fops = { |
661 | .owner = THIS_MODULE, |
662 | .open = pn_sock_open, |
663 | .read = seq_read, |
664 | .llseek = seq_lseek, |
665 | .release = seq_release_net, |
666 | }; |
667 | #endif |
668 | |
669 | static struct { |
670 | struct sock *sk[256]; |
671 | } pnres; |
672 | |
673 | /* |
674 | * Find and hold socket based on resource. |
675 | */ |
676 | struct sock *pn_find_sock_by_res(struct net *net, u8 res) |
677 | { |
678 | struct sock *sk; |
679 | |
680 | if (!net_eq(net, &init_net)) |
681 | return NULL; |
682 | |
683 | rcu_read_lock(); |
684 | sk = rcu_dereference(pnres.sk[res]); |
685 | if (sk) |
686 | sock_hold(sk); |
687 | rcu_read_unlock(); |
688 | return sk; |
689 | } |
690 | |
691 | static DEFINE_MUTEX(resource_mutex); |
692 | |
693 | int pn_sock_bind_res(struct sock *sk, u8 res) |
694 | { |
695 | int ret = -EADDRINUSE; |
696 | |
697 | if (!net_eq(sock_net(sk), &init_net)) |
698 | return -ENOIOCTLCMD; |
699 | if (!capable(CAP_SYS_ADMIN)) |
700 | return -EPERM; |
701 | if (pn_socket_autobind(sk->sk_socket)) |
702 | return -EAGAIN; |
703 | |
704 | mutex_lock(&resource_mutex); |
705 | if (pnres.sk[res] == NULL) { |
706 | sock_hold(sk); |
707 | rcu_assign_pointer(pnres.sk[res], sk); |
708 | ret = 0; |
709 | } |
710 | mutex_unlock(&resource_mutex); |
711 | return ret; |
712 | } |
713 | |
714 | int pn_sock_unbind_res(struct sock *sk, u8 res) |
715 | { |
716 | int ret = -ENOENT; |
717 | |
718 | if (!capable(CAP_SYS_ADMIN)) |
719 | return -EPERM; |
720 | |
721 | mutex_lock(&resource_mutex); |
722 | if (pnres.sk[res] == sk) { |
723 | rcu_assign_pointer(pnres.sk[res], NULL); |
724 | ret = 0; |
725 | } |
726 | mutex_unlock(&resource_mutex); |
727 | |
728 | if (ret == 0) { |
729 | synchronize_rcu(); |
730 | sock_put(sk); |
731 | } |
732 | return ret; |
733 | } |
734 | |
735 | void pn_sock_unbind_all_res(struct sock *sk) |
736 | { |
737 | unsigned res, match = 0; |
738 | |
739 | mutex_lock(&resource_mutex); |
740 | for (res = 0; res < 256; res++) { |
741 | if (pnres.sk[res] == sk) { |
742 | rcu_assign_pointer(pnres.sk[res], NULL); |
743 | match++; |
744 | } |
745 | } |
746 | mutex_unlock(&resource_mutex); |
747 | |
748 | if (match == 0) |
749 | return; |
750 | synchronize_rcu(); |
751 | while (match > 0) { |
752 | sock_put(sk); |
753 | match--; |
754 | } |
755 | } |
756 | |
757 | #ifdef CONFIG_PROC_FS |
758 | static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos) |
759 | { |
760 | struct net *net = seq_file_net(seq); |
761 | unsigned i; |
762 | |
763 | if (!net_eq(net, &init_net)) |
764 | return NULL; |
765 | |
766 | for (i = 0; i < 256; i++) { |
767 | if (pnres.sk[i] == NULL) |
768 | continue; |
769 | if (!pos) |
770 | return pnres.sk + i; |
771 | pos--; |
772 | } |
773 | return NULL; |
774 | } |
775 | |
776 | static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk) |
777 | { |
778 | struct net *net = seq_file_net(seq); |
779 | unsigned i; |
780 | |
781 | BUG_ON(!net_eq(net, &init_net)); |
782 | |
783 | for (i = (sk - pnres.sk) + 1; i < 256; i++) |
784 | if (pnres.sk[i]) |
785 | return pnres.sk + i; |
786 | return NULL; |
787 | } |
788 | |
789 | static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos) |
790 | __acquires(resource_mutex) |
791 | { |
792 | mutex_lock(&resource_mutex); |
793 | return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
794 | } |
795 | |
796 | static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
797 | { |
798 | struct sock **sk; |
799 | |
800 | if (v == SEQ_START_TOKEN) |
801 | sk = pn_res_get_idx(seq, 0); |
802 | else |
803 | sk = pn_res_get_next(seq, v); |
804 | (*pos)++; |
805 | return sk; |
806 | } |
807 | |
808 | static void pn_res_seq_stop(struct seq_file *seq, void *v) |
809 | __releases(resource_mutex) |
810 | { |
811 | mutex_unlock(&resource_mutex); |
812 | } |
813 | |
814 | static int pn_res_seq_show(struct seq_file *seq, void *v) |
815 | { |
816 | int len; |
817 | |
818 | if (v == SEQ_START_TOKEN) |
819 | seq_printf(seq, "%s%n", "rs uid inode", &len); |
820 | else { |
821 | struct sock **psk = v; |
822 | struct sock *sk = *psk; |
823 | |
824 | seq_printf(seq, "%02X %5d %lu%n", |
825 | (int) (psk - pnres.sk), sock_i_uid(sk), |
826 | sock_i_ino(sk), &len); |
827 | } |
828 | seq_printf(seq, "%*s\n", 63 - len, ""); |
829 | return 0; |
830 | } |
831 | |
832 | static const struct seq_operations pn_res_seq_ops = { |
833 | .start = pn_res_seq_start, |
834 | .next = pn_res_seq_next, |
835 | .stop = pn_res_seq_stop, |
836 | .show = pn_res_seq_show, |
837 | }; |
838 | |
839 | static int pn_res_open(struct inode *inode, struct file *file) |
840 | { |
841 | return seq_open_net(inode, file, &pn_res_seq_ops, |
842 | sizeof(struct seq_net_private)); |
843 | } |
844 | |
845 | const struct file_operations pn_res_seq_fops = { |
846 | .owner = THIS_MODULE, |
847 | .open = pn_res_open, |
848 | .read = seq_read, |
849 | .llseek = seq_lseek, |
850 | .release = seq_release_net, |
851 | }; |
852 | #endif |
853 |
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