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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 | } |
162 | EXPORT_SYMBOL(pn_sock_unhash); |
163 | |
164 | static DEFINE_MUTEX(port_mutex); |
165 | |
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); |
185 | if (saddr && phonet_address_lookup(sock_net(sk), saddr)) |
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 | } |
193 | WARN_ON(sk_hashed(sk)); |
194 | mutex_lock(&port_mutex); |
195 | err = sk->sk_prot->get_port(sk, pn_port(handle)); |
196 | if (err) |
197 | goto out_port; |
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); |
205 | out_port: |
206 | mutex_unlock(&port_mutex); |
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 | |
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 | |
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 | |
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 | |
268 | poll_wait(file, &sock->wait, wait); |
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; |
279 | if (!skb_queue_empty(&pn->ctrlreq_queue)) |
280 | mask |= POLLPRI; |
281 | if (!mask && sk->sk_state == TCP_CLOSE_WAIT) |
282 | return POLLHUP; |
283 | |
284 | if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits)) |
285 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
286 | |
287 | return mask; |
288 | } |
289 | |
290 | static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, |
291 | unsigned long arg) |
292 | { |
293 | struct sock *sk = sock->sk; |
294 | struct pn_sock *pn = pn_sk(sk); |
295 | |
296 | if (cmd == SIOCPNGETOBJECT) { |
297 | struct net_device *dev; |
298 | u16 handle; |
299 | u8 saddr; |
300 | |
301 | if (get_user(handle, (__u16 __user *)arg)) |
302 | return -EFAULT; |
303 | |
304 | lock_sock(sk); |
305 | if (sk->sk_bound_dev_if) |
306 | dev = dev_get_by_index(sock_net(sk), |
307 | sk->sk_bound_dev_if); |
308 | else |
309 | dev = phonet_device_get(sock_net(sk)); |
310 | if (dev && (dev->flags & IFF_UP)) |
311 | saddr = phonet_address_get(dev, pn_addr(handle)); |
312 | else |
313 | saddr = PN_NO_ADDR; |
314 | release_sock(sk); |
315 | |
316 | if (dev) |
317 | dev_put(dev); |
318 | if (saddr == PN_NO_ADDR) |
319 | return -EHOSTUNREACH; |
320 | |
321 | handle = pn_object(saddr, pn_port(pn->sobject)); |
322 | return put_user(handle, (__u16 __user *)arg); |
323 | } |
324 | |
325 | return sk->sk_prot->ioctl(sk, cmd, arg); |
326 | } |
327 | |
328 | static int pn_socket_listen(struct socket *sock, int backlog) |
329 | { |
330 | struct sock *sk = sock->sk; |
331 | int err = 0; |
332 | |
333 | if (sock->state != SS_UNCONNECTED) |
334 | return -EINVAL; |
335 | if (pn_socket_autobind(sock)) |
336 | return -ENOBUFS; |
337 | |
338 | lock_sock(sk); |
339 | if (sk->sk_state != TCP_CLOSE) { |
340 | err = -EINVAL; |
341 | goto out; |
342 | } |
343 | |
344 | sk->sk_state = TCP_LISTEN; |
345 | sk->sk_ack_backlog = 0; |
346 | sk->sk_max_ack_backlog = backlog; |
347 | out: |
348 | release_sock(sk); |
349 | return err; |
350 | } |
351 | |
352 | static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock, |
353 | struct msghdr *m, size_t total_len) |
354 | { |
355 | struct sock *sk = sock->sk; |
356 | |
357 | if (pn_socket_autobind(sock)) |
358 | return -EAGAIN; |
359 | |
360 | return sk->sk_prot->sendmsg(iocb, sk, m, total_len); |
361 | } |
362 | |
363 | const struct proto_ops phonet_dgram_ops = { |
364 | .family = AF_PHONET, |
365 | .owner = THIS_MODULE, |
366 | .release = pn_socket_release, |
367 | .bind = pn_socket_bind, |
368 | .connect = sock_no_connect, |
369 | .socketpair = sock_no_socketpair, |
370 | .accept = sock_no_accept, |
371 | .getname = pn_socket_getname, |
372 | .poll = datagram_poll, |
373 | .ioctl = pn_socket_ioctl, |
374 | .listen = sock_no_listen, |
375 | .shutdown = sock_no_shutdown, |
376 | .setsockopt = sock_no_setsockopt, |
377 | .getsockopt = sock_no_getsockopt, |
378 | #ifdef CONFIG_COMPAT |
379 | .compat_setsockopt = sock_no_setsockopt, |
380 | .compat_getsockopt = sock_no_getsockopt, |
381 | #endif |
382 | .sendmsg = pn_socket_sendmsg, |
383 | .recvmsg = sock_common_recvmsg, |
384 | .mmap = sock_no_mmap, |
385 | .sendpage = sock_no_sendpage, |
386 | }; |
387 | |
388 | const struct proto_ops phonet_stream_ops = { |
389 | .family = AF_PHONET, |
390 | .owner = THIS_MODULE, |
391 | .release = pn_socket_release, |
392 | .bind = pn_socket_bind, |
393 | .connect = sock_no_connect, |
394 | .socketpair = sock_no_socketpair, |
395 | .accept = pn_socket_accept, |
396 | .getname = pn_socket_getname, |
397 | .poll = pn_socket_poll, |
398 | .ioctl = pn_socket_ioctl, |
399 | .listen = pn_socket_listen, |
400 | .shutdown = sock_no_shutdown, |
401 | .setsockopt = sock_common_setsockopt, |
402 | .getsockopt = sock_common_getsockopt, |
403 | #ifdef CONFIG_COMPAT |
404 | .compat_setsockopt = compat_sock_common_setsockopt, |
405 | .compat_getsockopt = compat_sock_common_getsockopt, |
406 | #endif |
407 | .sendmsg = pn_socket_sendmsg, |
408 | .recvmsg = sock_common_recvmsg, |
409 | .mmap = sock_no_mmap, |
410 | .sendpage = sock_no_sendpage, |
411 | }; |
412 | EXPORT_SYMBOL(phonet_stream_ops); |
413 | |
414 | /* allocate port for a socket */ |
415 | int pn_sock_get_port(struct sock *sk, unsigned short sport) |
416 | { |
417 | static int port_cur; |
418 | struct net *net = sock_net(sk); |
419 | struct pn_sock *pn = pn_sk(sk); |
420 | struct sockaddr_pn try_sa; |
421 | struct sock *tmpsk; |
422 | |
423 | memset(&try_sa, 0, sizeof(struct sockaddr_pn)); |
424 | try_sa.spn_family = AF_PHONET; |
425 | WARN_ON(!mutex_is_locked(&port_mutex)); |
426 | if (!sport) { |
427 | /* search free port */ |
428 | int port, pmin, pmax; |
429 | |
430 | phonet_get_local_port_range(&pmin, &pmax); |
431 | for (port = pmin; port <= pmax; port++) { |
432 | port_cur++; |
433 | if (port_cur < pmin || port_cur > pmax) |
434 | port_cur = pmin; |
435 | |
436 | pn_sockaddr_set_port(&try_sa, port_cur); |
437 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
438 | if (tmpsk == NULL) { |
439 | sport = port_cur; |
440 | goto found; |
441 | } else |
442 | sock_put(tmpsk); |
443 | } |
444 | } else { |
445 | /* try to find specific port */ |
446 | pn_sockaddr_set_port(&try_sa, sport); |
447 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
448 | if (tmpsk == NULL) |
449 | /* No sock there! We can use that port... */ |
450 | goto found; |
451 | else |
452 | sock_put(tmpsk); |
453 | } |
454 | /* the port must be in use already */ |
455 | return -EADDRINUSE; |
456 | |
457 | found: |
458 | pn->sobject = pn_object(pn_addr(pn->sobject), sport); |
459 | return 0; |
460 | } |
461 | EXPORT_SYMBOL(pn_sock_get_port); |
462 | |
463 | #ifdef CONFIG_PROC_FS |
464 | static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) |
465 | { |
466 | struct net *net = seq_file_net(seq); |
467 | struct hlist_head *hlist = pnsocks.hlist; |
468 | struct hlist_node *node; |
469 | struct sock *sknode; |
470 | unsigned h; |
471 | |
472 | for (h = 0; h < PN_HASHSIZE; h++) { |
473 | sk_for_each(sknode, node, hlist) { |
474 | if (!net_eq(net, sock_net(sknode))) |
475 | continue; |
476 | if (!pos) |
477 | return sknode; |
478 | pos--; |
479 | } |
480 | hlist++; |
481 | } |
482 | return NULL; |
483 | } |
484 | |
485 | static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) |
486 | { |
487 | struct net *net = seq_file_net(seq); |
488 | |
489 | do |
490 | sk = sk_next(sk); |
491 | while (sk && !net_eq(net, sock_net(sk))); |
492 | |
493 | return sk; |
494 | } |
495 | |
496 | static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) |
497 | __acquires(pnsocks.lock) |
498 | { |
499 | spin_lock_bh(&pnsocks.lock); |
500 | return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
501 | } |
502 | |
503 | static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
504 | { |
505 | struct sock *sk; |
506 | |
507 | if (v == SEQ_START_TOKEN) |
508 | sk = pn_sock_get_idx(seq, 0); |
509 | else |
510 | sk = pn_sock_get_next(seq, v); |
511 | (*pos)++; |
512 | return sk; |
513 | } |
514 | |
515 | static void pn_sock_seq_stop(struct seq_file *seq, void *v) |
516 | __releases(pnsocks.lock) |
517 | { |
518 | spin_unlock_bh(&pnsocks.lock); |
519 | } |
520 | |
521 | static int pn_sock_seq_show(struct seq_file *seq, void *v) |
522 | { |
523 | int len; |
524 | |
525 | if (v == SEQ_START_TOKEN) |
526 | seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue " |
527 | " uid inode ref pointer drops", &len); |
528 | else { |
529 | struct sock *sk = v; |
530 | struct pn_sock *pn = pn_sk(sk); |
531 | |
532 | seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " |
533 | "%d %p %d%n", |
534 | sk->sk_protocol, pn->sobject, 0, pn->resource, |
535 | sk->sk_state, |
536 | sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), |
537 | sock_i_uid(sk), sock_i_ino(sk), |
538 | atomic_read(&sk->sk_refcnt), sk, |
539 | atomic_read(&sk->sk_drops), &len); |
540 | } |
541 | seq_printf(seq, "%*s\n", 127 - len, ""); |
542 | return 0; |
543 | } |
544 | |
545 | static const struct seq_operations pn_sock_seq_ops = { |
546 | .start = pn_sock_seq_start, |
547 | .next = pn_sock_seq_next, |
548 | .stop = pn_sock_seq_stop, |
549 | .show = pn_sock_seq_show, |
550 | }; |
551 | |
552 | static int pn_sock_open(struct inode *inode, struct file *file) |
553 | { |
554 | return seq_open_net(inode, file, &pn_sock_seq_ops, |
555 | sizeof(struct seq_net_private)); |
556 | } |
557 | |
558 | const struct file_operations pn_sock_seq_fops = { |
559 | .owner = THIS_MODULE, |
560 | .open = pn_sock_open, |
561 | .read = seq_read, |
562 | .llseek = seq_lseek, |
563 | .release = seq_release_net, |
564 | }; |
565 | #endif |
566 |
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