Commit | Line | Data |
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ba113a94 RDC |
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 | ||
5a0e3ad6 | 26 | #include <linux/gfp.h> |
ba113a94 RDC |
27 | #include <linux/kernel.h> |
28 | #include <linux/net.h> | |
9995a32b | 29 | #include <linux/poll.h> |
ba113a94 RDC |
30 | #include <net/sock.h> |
31 | #include <net/tcp_states.h> | |
32 | ||
33 | #include <linux/phonet.h> | |
34 | #include <net/phonet/phonet.h> | |
9995a32b | 35 | #include <net/phonet/pep.h> |
ba113a94 RDC |
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 | ||
6b0d07ba RDC |
49 | #define PN_HASHSIZE 16 |
50 | #define PN_HASHMASK (PN_HASHSIZE-1) | |
51 | ||
52 | ||
ba113a94 | 53 | static struct { |
6b0d07ba | 54 | struct hlist_head hlist[PN_HASHSIZE]; |
ba113a94 | 55 | spinlock_t lock; |
6b0d07ba RDC |
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 | } | |
ba113a94 RDC |
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 | */ | |
52404881 | 76 | struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn) |
ba113a94 RDC |
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; | |
6b0d07ba | 83 | struct hlist_head *hlist = pn_hash_list(obj); |
ba113a94 RDC |
84 | |
85 | spin_lock_bh(&pnsocks.lock); | |
86 | ||
6b0d07ba | 87 | sk_for_each(sknode, node, hlist) { |
ba113a94 RDC |
88 | struct pn_sock *pn = pn_sk(sknode); |
89 | BUG_ON(!pn->sobject); /* unbound socket */ | |
90 | ||
52404881 RDC |
91 | if (!net_eq(sock_net(sknode), net)) |
92 | continue; | |
ba113a94 RDC |
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 | } | |
f64f9e71 JP |
102 | if (pn_addr(pn->sobject) && |
103 | pn_addr(pn->sobject) != pn_addr(obj)) | |
ba113a94 RDC |
104 | continue; |
105 | ||
106 | rval = sknode; | |
107 | sock_hold(sknode); | |
108 | break; | |
109 | } | |
110 | ||
111 | spin_unlock_bh(&pnsocks.lock); | |
112 | ||
113 | return rval; | |
f14001fc RDC |
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 | { | |
6b0d07ba RDC |
119 | struct hlist_head *hlist = pnsocks.hlist; |
120 | unsigned h; | |
f14001fc RDC |
121 | |
122 | spin_lock(&pnsocks.lock); | |
6b0d07ba RDC |
123 | for (h = 0; h < PN_HASHSIZE; h++) { |
124 | struct hlist_node *node; | |
125 | struct sock *sknode; | |
f14001fc | 126 | |
6b0d07ba RDC |
127 | sk_for_each(sknode, node, hlist) { |
128 | struct sk_buff *clone; | |
ba113a94 | 129 | |
6b0d07ba RDC |
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 | } | |
21912d1c | 140 | } |
6b0d07ba | 141 | hlist++; |
f14001fc RDC |
142 | } |
143 | spin_unlock(&pnsocks.lock); | |
ba113a94 RDC |
144 | } |
145 | ||
146 | void pn_sock_hash(struct sock *sk) | |
147 | { | |
6b0d07ba RDC |
148 | struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject); |
149 | ||
ba113a94 | 150 | spin_lock_bh(&pnsocks.lock); |
6b0d07ba | 151 | sk_add_node(sk, hlist); |
ba113a94 RDC |
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 | } | |
162 | EXPORT_SYMBOL(pn_sock_unhash); | |
163 | ||
582b0b61 RDC |
164 | static DEFINE_MUTEX(port_mutex); |
165 | ||
ba113a94 RDC |
166 | static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len) |
167 | { | |
168 | struct sock *sk = sock->sk; | |
169 | struct pn_sock *pn = pn_sk(sk); | |
170 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; | |
171 | int err; | |
172 | u16 handle; | |
173 | u8 saddr; | |
174 | ||
175 | if (sk->sk_prot->bind) | |
176 | return sk->sk_prot->bind(sk, addr, len); | |
177 | ||
178 | if (len < sizeof(struct sockaddr_pn)) | |
179 | return -EINVAL; | |
180 | if (spn->spn_family != AF_PHONET) | |
181 | return -EAFNOSUPPORT; | |
182 | ||
183 | handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr); | |
184 | saddr = pn_addr(handle); | |
52404881 | 185 | if (saddr && phonet_address_lookup(sock_net(sk), saddr)) |
ba113a94 RDC |
186 | return -EADDRNOTAVAIL; |
187 | ||
188 | lock_sock(sk); | |
189 | if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) { | |
190 | err = -EINVAL; /* attempt to rebind */ | |
191 | goto out; | |
192 | } | |
582b0b61 RDC |
193 | WARN_ON(sk_hashed(sk)); |
194 | mutex_lock(&port_mutex); | |
ba113a94 RDC |
195 | err = sk->sk_prot->get_port(sk, pn_port(handle)); |
196 | if (err) | |
582b0b61 | 197 | goto out_port; |
ba113a94 RDC |
198 | |
199 | /* get_port() sets the port, bind() sets the address if applicable */ | |
200 | pn->sobject = pn_object(saddr, pn_port(pn->sobject)); | |
201 | pn->resource = spn->spn_resource; | |
202 | ||
203 | /* Enable RX on the socket */ | |
204 | sk->sk_prot->hash(sk); | |
582b0b61 RDC |
205 | out_port: |
206 | mutex_unlock(&port_mutex); | |
ba113a94 RDC |
207 | out: |
208 | release_sock(sk); | |
209 | return err; | |
210 | } | |
211 | ||
212 | static int pn_socket_autobind(struct socket *sock) | |
213 | { | |
214 | struct sockaddr_pn sa; | |
215 | int err; | |
216 | ||
217 | memset(&sa, 0, sizeof(sa)); | |
218 | sa.spn_family = AF_PHONET; | |
219 | err = pn_socket_bind(sock, (struct sockaddr *)&sa, | |
220 | sizeof(struct sockaddr_pn)); | |
221 | if (err != -EINVAL) | |
222 | return err; | |
223 | BUG_ON(!pn_port(pn_sk(sock->sk)->sobject)); | |
224 | return 0; /* socket was already bound */ | |
225 | } | |
226 | ||
9995a32b RDC |
227 | static int pn_socket_accept(struct socket *sock, struct socket *newsock, |
228 | int flags) | |
229 | { | |
230 | struct sock *sk = sock->sk; | |
231 | struct sock *newsk; | |
232 | int err; | |
233 | ||
234 | newsk = sk->sk_prot->accept(sk, flags, &err); | |
235 | if (!newsk) | |
236 | return err; | |
237 | ||
238 | lock_sock(newsk); | |
239 | sock_graft(newsk, newsock); | |
240 | newsock->state = SS_CONNECTED; | |
241 | release_sock(newsk); | |
242 | return 0; | |
243 | } | |
244 | ||
ba113a94 RDC |
245 | static int pn_socket_getname(struct socket *sock, struct sockaddr *addr, |
246 | int *sockaddr_len, int peer) | |
247 | { | |
248 | struct sock *sk = sock->sk; | |
249 | struct pn_sock *pn = pn_sk(sk); | |
250 | ||
251 | memset(addr, 0, sizeof(struct sockaddr_pn)); | |
252 | addr->sa_family = AF_PHONET; | |
253 | if (!peer) /* Race with bind() here is userland's problem. */ | |
254 | pn_sockaddr_set_object((struct sockaddr_pn *)addr, | |
255 | pn->sobject); | |
256 | ||
257 | *sockaddr_len = sizeof(struct sockaddr_pn); | |
258 | return 0; | |
259 | } | |
260 | ||
9995a32b RDC |
261 | static unsigned int pn_socket_poll(struct file *file, struct socket *sock, |
262 | poll_table *wait) | |
263 | { | |
264 | struct sock *sk = sock->sk; | |
265 | struct pep_sock *pn = pep_sk(sk); | |
266 | unsigned int mask = 0; | |
267 | ||
43815482 | 268 | poll_wait(file, sk_sleep(sk), wait); |
9995a32b RDC |
269 | |
270 | switch (sk->sk_state) { | |
271 | case TCP_LISTEN: | |
272 | return hlist_empty(&pn->ackq) ? 0 : POLLIN; | |
273 | case TCP_CLOSE: | |
274 | return POLLERR; | |
275 | } | |
276 | ||
277 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
278 | mask |= POLLIN | POLLRDNORM; | |
c41bd97f RDC |
279 | if (!skb_queue_empty(&pn->ctrlreq_queue)) |
280 | mask |= POLLPRI; | |
281 | if (!mask && sk->sk_state == TCP_CLOSE_WAIT) | |
9995a32b RDC |
282 | return POLLHUP; |
283 | ||
01b38606 RDC |
284 | if (sk->sk_state == TCP_ESTABLISHED && |
285 | atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && | |
286 | atomic_read(&pn->tx_credits)) | |
9995a32b RDC |
287 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
288 | ||
289 | return mask; | |
290 | } | |
291 | ||
ba113a94 RDC |
292 | static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, |
293 | unsigned long arg) | |
294 | { | |
295 | struct sock *sk = sock->sk; | |
296 | struct pn_sock *pn = pn_sk(sk); | |
297 | ||
298 | if (cmd == SIOCPNGETOBJECT) { | |
299 | struct net_device *dev; | |
300 | u16 handle; | |
301 | u8 saddr; | |
302 | ||
303 | if (get_user(handle, (__u16 __user *)arg)) | |
304 | return -EFAULT; | |
305 | ||
306 | lock_sock(sk); | |
307 | if (sk->sk_bound_dev_if) | |
308 | dev = dev_get_by_index(sock_net(sk), | |
309 | sk->sk_bound_dev_if); | |
310 | else | |
311 | dev = phonet_device_get(sock_net(sk)); | |
312 | if (dev && (dev->flags & IFF_UP)) | |
313 | saddr = phonet_address_get(dev, pn_addr(handle)); | |
314 | else | |
315 | saddr = PN_NO_ADDR; | |
316 | release_sock(sk); | |
317 | ||
318 | if (dev) | |
319 | dev_put(dev); | |
320 | if (saddr == PN_NO_ADDR) | |
321 | return -EHOSTUNREACH; | |
322 | ||
323 | handle = pn_object(saddr, pn_port(pn->sobject)); | |
324 | return put_user(handle, (__u16 __user *)arg); | |
325 | } | |
326 | ||
327 | return sk->sk_prot->ioctl(sk, cmd, arg); | |
328 | } | |
329 | ||
9995a32b RDC |
330 | static int pn_socket_listen(struct socket *sock, int backlog) |
331 | { | |
332 | struct sock *sk = sock->sk; | |
333 | int err = 0; | |
334 | ||
335 | if (sock->state != SS_UNCONNECTED) | |
336 | return -EINVAL; | |
337 | if (pn_socket_autobind(sock)) | |
338 | return -ENOBUFS; | |
339 | ||
340 | lock_sock(sk); | |
341 | if (sk->sk_state != TCP_CLOSE) { | |
342 | err = -EINVAL; | |
343 | goto out; | |
344 | } | |
345 | ||
346 | sk->sk_state = TCP_LISTEN; | |
347 | sk->sk_ack_backlog = 0; | |
348 | sk->sk_max_ack_backlog = backlog; | |
349 | out: | |
350 | release_sock(sk); | |
351 | return err; | |
352 | } | |
353 | ||
ba113a94 RDC |
354 | static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock, |
355 | struct msghdr *m, size_t total_len) | |
356 | { | |
357 | struct sock *sk = sock->sk; | |
358 | ||
359 | if (pn_socket_autobind(sock)) | |
360 | return -EAGAIN; | |
361 | ||
362 | return sk->sk_prot->sendmsg(iocb, sk, m, total_len); | |
363 | } | |
364 | ||
365 | const struct proto_ops phonet_dgram_ops = { | |
366 | .family = AF_PHONET, | |
367 | .owner = THIS_MODULE, | |
368 | .release = pn_socket_release, | |
369 | .bind = pn_socket_bind, | |
370 | .connect = sock_no_connect, | |
371 | .socketpair = sock_no_socketpair, | |
372 | .accept = sock_no_accept, | |
373 | .getname = pn_socket_getname, | |
374 | .poll = datagram_poll, | |
375 | .ioctl = pn_socket_ioctl, | |
376 | .listen = sock_no_listen, | |
377 | .shutdown = sock_no_shutdown, | |
378 | .setsockopt = sock_no_setsockopt, | |
379 | .getsockopt = sock_no_getsockopt, | |
380 | #ifdef CONFIG_COMPAT | |
381 | .compat_setsockopt = sock_no_setsockopt, | |
382 | .compat_getsockopt = sock_no_getsockopt, | |
383 | #endif | |
384 | .sendmsg = pn_socket_sendmsg, | |
385 | .recvmsg = sock_common_recvmsg, | |
386 | .mmap = sock_no_mmap, | |
387 | .sendpage = sock_no_sendpage, | |
388 | }; | |
389 | ||
9995a32b RDC |
390 | const struct proto_ops phonet_stream_ops = { |
391 | .family = AF_PHONET, | |
392 | .owner = THIS_MODULE, | |
393 | .release = pn_socket_release, | |
394 | .bind = pn_socket_bind, | |
395 | .connect = sock_no_connect, | |
396 | .socketpair = sock_no_socketpair, | |
397 | .accept = pn_socket_accept, | |
398 | .getname = pn_socket_getname, | |
399 | .poll = pn_socket_poll, | |
400 | .ioctl = pn_socket_ioctl, | |
401 | .listen = pn_socket_listen, | |
402 | .shutdown = sock_no_shutdown, | |
02a47617 RDC |
403 | .setsockopt = sock_common_setsockopt, |
404 | .getsockopt = sock_common_getsockopt, | |
9995a32b | 405 | #ifdef CONFIG_COMPAT |
02a47617 RDC |
406 | .compat_setsockopt = compat_sock_common_setsockopt, |
407 | .compat_getsockopt = compat_sock_common_getsockopt, | |
9995a32b RDC |
408 | #endif |
409 | .sendmsg = pn_socket_sendmsg, | |
410 | .recvmsg = sock_common_recvmsg, | |
411 | .mmap = sock_no_mmap, | |
412 | .sendpage = sock_no_sendpage, | |
413 | }; | |
414 | EXPORT_SYMBOL(phonet_stream_ops); | |
415 | ||
ba113a94 RDC |
416 | /* allocate port for a socket */ |
417 | int pn_sock_get_port(struct sock *sk, unsigned short sport) | |
418 | { | |
419 | static int port_cur; | |
52404881 | 420 | struct net *net = sock_net(sk); |
ba113a94 RDC |
421 | struct pn_sock *pn = pn_sk(sk); |
422 | struct sockaddr_pn try_sa; | |
423 | struct sock *tmpsk; | |
424 | ||
425 | memset(&try_sa, 0, sizeof(struct sockaddr_pn)); | |
426 | try_sa.spn_family = AF_PHONET; | |
582b0b61 | 427 | WARN_ON(!mutex_is_locked(&port_mutex)); |
ba113a94 RDC |
428 | if (!sport) { |
429 | /* search free port */ | |
87ab4e20 | 430 | int port, pmin, pmax; |
ba113a94 | 431 | |
87ab4e20 | 432 | phonet_get_local_port_range(&pmin, &pmax); |
ba113a94 RDC |
433 | for (port = pmin; port <= pmax; port++) { |
434 | port_cur++; | |
435 | if (port_cur < pmin || port_cur > pmax) | |
436 | port_cur = pmin; | |
437 | ||
438 | pn_sockaddr_set_port(&try_sa, port_cur); | |
52404881 | 439 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
440 | if (tmpsk == NULL) { |
441 | sport = port_cur; | |
442 | goto found; | |
443 | } else | |
444 | sock_put(tmpsk); | |
445 | } | |
446 | } else { | |
447 | /* try to find specific port */ | |
448 | pn_sockaddr_set_port(&try_sa, sport); | |
52404881 | 449 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
450 | if (tmpsk == NULL) |
451 | /* No sock there! We can use that port... */ | |
452 | goto found; | |
453 | else | |
454 | sock_put(tmpsk); | |
455 | } | |
ba113a94 RDC |
456 | /* the port must be in use already */ |
457 | return -EADDRINUSE; | |
458 | ||
459 | found: | |
ba113a94 RDC |
460 | pn->sobject = pn_object(pn_addr(pn->sobject), sport); |
461 | return 0; | |
462 | } | |
463 | EXPORT_SYMBOL(pn_sock_get_port); | |
c1dc13e9 | 464 | |
ae6e2aef | 465 | #ifdef CONFIG_PROC_FS |
c1dc13e9 RDC |
466 | static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) |
467 | { | |
468 | struct net *net = seq_file_net(seq); | |
6b0d07ba | 469 | struct hlist_head *hlist = pnsocks.hlist; |
c1dc13e9 RDC |
470 | struct hlist_node *node; |
471 | struct sock *sknode; | |
6b0d07ba | 472 | unsigned h; |
c1dc13e9 | 473 | |
6b0d07ba RDC |
474 | for (h = 0; h < PN_HASHSIZE; h++) { |
475 | sk_for_each(sknode, node, hlist) { | |
476 | if (!net_eq(net, sock_net(sknode))) | |
477 | continue; | |
478 | if (!pos) | |
479 | return sknode; | |
480 | pos--; | |
481 | } | |
482 | hlist++; | |
c1dc13e9 RDC |
483 | } |
484 | return NULL; | |
485 | } | |
486 | ||
487 | static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) | |
488 | { | |
489 | struct net *net = seq_file_net(seq); | |
490 | ||
491 | do | |
492 | sk = sk_next(sk); | |
493 | while (sk && !net_eq(net, sock_net(sk))); | |
494 | ||
495 | return sk; | |
496 | } | |
497 | ||
498 | static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) | |
499 | __acquires(pnsocks.lock) | |
500 | { | |
501 | spin_lock_bh(&pnsocks.lock); | |
502 | return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
503 | } | |
504 | ||
505 | static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
506 | { | |
507 | struct sock *sk; | |
508 | ||
509 | if (v == SEQ_START_TOKEN) | |
510 | sk = pn_sock_get_idx(seq, 0); | |
511 | else | |
512 | sk = pn_sock_get_next(seq, v); | |
513 | (*pos)++; | |
514 | return sk; | |
515 | } | |
516 | ||
517 | static void pn_sock_seq_stop(struct seq_file *seq, void *v) | |
518 | __releases(pnsocks.lock) | |
519 | { | |
520 | spin_unlock_bh(&pnsocks.lock); | |
521 | } | |
522 | ||
523 | static int pn_sock_seq_show(struct seq_file *seq, void *v) | |
524 | { | |
525 | int len; | |
526 | ||
527 | if (v == SEQ_START_TOKEN) | |
528 | seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue " | |
529 | " uid inode ref pointer drops", &len); | |
530 | else { | |
531 | struct sock *sk = v; | |
532 | struct pn_sock *pn = pn_sk(sk); | |
533 | ||
534 | seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " | |
535 | "%d %p %d%n", | |
536 | sk->sk_protocol, pn->sobject, 0, pn->resource, | |
537 | sk->sk_state, | |
538 | sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), | |
539 | sock_i_uid(sk), sock_i_ino(sk), | |
540 | atomic_read(&sk->sk_refcnt), sk, | |
541 | atomic_read(&sk->sk_drops), &len); | |
542 | } | |
543 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
544 | return 0; | |
545 | } | |
546 | ||
547 | static const struct seq_operations pn_sock_seq_ops = { | |
548 | .start = pn_sock_seq_start, | |
549 | .next = pn_sock_seq_next, | |
550 | .stop = pn_sock_seq_stop, | |
551 | .show = pn_sock_seq_show, | |
552 | }; | |
553 | ||
554 | static int pn_sock_open(struct inode *inode, struct file *file) | |
555 | { | |
cb7d9e7f RDC |
556 | return seq_open_net(inode, file, &pn_sock_seq_ops, |
557 | sizeof(struct seq_net_private)); | |
c1dc13e9 RDC |
558 | } |
559 | ||
560 | const struct file_operations pn_sock_seq_fops = { | |
561 | .owner = THIS_MODULE, | |
562 | .open = pn_sock_open, | |
563 | .read = seq_read, | |
564 | .llseek = seq_lseek, | |
cb7d9e7f | 565 | .release = seq_release_net, |
c1dc13e9 | 566 | }; |
ae6e2aef | 567 | #endif |
4e3d16ce RDC |
568 | |
569 | static struct { | |
570 | struct sock *sk[256]; | |
571 | } pnres; | |
572 | ||
573 | /* | |
574 | * Find and hold socket based on resource. | |
575 | */ | |
576 | struct sock *pn_find_sock_by_res(struct net *net, u8 res) | |
577 | { | |
578 | struct sock *sk; | |
579 | ||
580 | if (!net_eq(net, &init_net)) | |
581 | return NULL; | |
582 | ||
583 | rcu_read_lock(); | |
584 | sk = rcu_dereference(pnres.sk[res]); | |
585 | if (sk) | |
586 | sock_hold(sk); | |
587 | rcu_read_unlock(); | |
588 | return sk; | |
589 | } | |
590 | ||
591 | static DEFINE_MUTEX(resource_mutex); | |
592 | ||
593 | int pn_sock_bind_res(struct sock *sk, u8 res) | |
594 | { | |
595 | int ret = -EADDRINUSE; | |
596 | ||
597 | if (!net_eq(sock_net(sk), &init_net)) | |
598 | return -ENOIOCTLCMD; | |
599 | if (!capable(CAP_SYS_ADMIN)) | |
600 | return -EPERM; | |
601 | if (pn_socket_autobind(sk->sk_socket)) | |
602 | return -EAGAIN; | |
603 | ||
604 | mutex_lock(&resource_mutex); | |
605 | if (pnres.sk[res] == NULL) { | |
606 | sock_hold(sk); | |
607 | rcu_assign_pointer(pnres.sk[res], sk); | |
608 | ret = 0; | |
609 | } | |
610 | mutex_unlock(&resource_mutex); | |
611 | return ret; | |
612 | } | |
613 | ||
614 | int pn_sock_unbind_res(struct sock *sk, u8 res) | |
615 | { | |
616 | int ret = -ENOENT; | |
617 | ||
618 | if (!capable(CAP_SYS_ADMIN)) | |
619 | return -EPERM; | |
620 | ||
621 | mutex_lock(&resource_mutex); | |
622 | if (pnres.sk[res] == sk) { | |
623 | rcu_assign_pointer(pnres.sk[res], NULL); | |
624 | ret = 0; | |
625 | } | |
626 | mutex_unlock(&resource_mutex); | |
627 | ||
628 | if (ret == 0) { | |
629 | synchronize_rcu(); | |
630 | sock_put(sk); | |
631 | } | |
632 | return ret; | |
633 | } | |
634 | ||
635 | void pn_sock_unbind_all_res(struct sock *sk) | |
636 | { | |
637 | unsigned res, match = 0; | |
638 | ||
639 | mutex_lock(&resource_mutex); | |
640 | for (res = 0; res < 256; res++) { | |
641 | if (pnres.sk[res] == sk) { | |
642 | rcu_assign_pointer(pnres.sk[res], NULL); | |
643 | match++; | |
644 | } | |
645 | } | |
646 | mutex_unlock(&resource_mutex); | |
647 | ||
648 | if (match == 0) | |
649 | return; | |
650 | synchronize_rcu(); | |
651 | while (match > 0) { | |
652 | sock_put(sk); | |
653 | match--; | |
654 | } | |
655 | } |