Commit | Line | Data |
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d646960f SO |
1 | /* |
2 | * Copyright (C) 2011 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the | |
16 | * Free Software Foundation, Inc., | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/nfc.h> | |
26 | ||
27 | #include "../nfc.h" | |
28 | #include "llcp.h" | |
29 | ||
ff353d86 SO |
30 | static int sock_wait_state(struct sock *sk, int state, unsigned long timeo) |
31 | { | |
32 | DECLARE_WAITQUEUE(wait, current); | |
33 | int err = 0; | |
34 | ||
35 | pr_debug("sk %p", sk); | |
36 | ||
37 | add_wait_queue(sk_sleep(sk), &wait); | |
38 | set_current_state(TASK_INTERRUPTIBLE); | |
39 | ||
40 | while (sk->sk_state != state) { | |
41 | if (!timeo) { | |
42 | err = -EINPROGRESS; | |
43 | break; | |
44 | } | |
45 | ||
46 | if (signal_pending(current)) { | |
47 | err = sock_intr_errno(timeo); | |
48 | break; | |
49 | } | |
50 | ||
51 | release_sock(sk); | |
52 | timeo = schedule_timeout(timeo); | |
53 | lock_sock(sk); | |
54 | set_current_state(TASK_INTERRUPTIBLE); | |
55 | ||
56 | err = sock_error(sk); | |
57 | if (err) | |
58 | break; | |
59 | } | |
60 | ||
61 | __set_current_state(TASK_RUNNING); | |
62 | remove_wait_queue(sk_sleep(sk), &wait); | |
63 | return err; | |
64 | } | |
65 | ||
d646960f SO |
66 | static struct proto llcp_sock_proto = { |
67 | .name = "NFC_LLCP", | |
68 | .owner = THIS_MODULE, | |
69 | .obj_size = sizeof(struct nfc_llcp_sock), | |
70 | }; | |
71 | ||
72 | static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) | |
73 | { | |
74 | struct sock *sk = sock->sk; | |
75 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
76 | struct nfc_llcp_local *local; | |
77 | struct nfc_dev *dev; | |
78 | struct sockaddr_nfc_llcp llcp_addr; | |
79 | int len, ret = 0; | |
80 | ||
81 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
82 | ||
83 | if (!addr || addr->sa_family != AF_NFC) | |
84 | return -EINVAL; | |
85 | ||
86 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
87 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
88 | memcpy(&llcp_addr, addr, len); | |
89 | ||
90 | /* This is going to be a listening socket, dsap must be 0 */ | |
91 | if (llcp_addr.dsap != 0) | |
92 | return -EINVAL; | |
93 | ||
94 | lock_sock(sk); | |
95 | ||
96 | if (sk->sk_state != LLCP_CLOSED) { | |
97 | ret = -EBADFD; | |
98 | goto error; | |
99 | } | |
100 | ||
101 | dev = nfc_get_device(llcp_addr.dev_idx); | |
102 | if (dev == NULL) { | |
103 | ret = -ENODEV; | |
104 | goto error; | |
105 | } | |
106 | ||
107 | local = nfc_llcp_find_local(dev); | |
108 | if (local == NULL) { | |
109 | ret = -ENODEV; | |
110 | goto put_dev; | |
111 | } | |
112 | ||
113 | llcp_sock->dev = dev; | |
114 | llcp_sock->local = local; | |
115 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
116 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
117 | llcp_addr.service_name_len, |
118 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 119 | llcp_sock->service_name = kmemdup(llcp_addr.service_name, |
427a2eb1 SO |
120 | llcp_sock->service_name_len, |
121 | GFP_KERNEL); | |
d646960f SO |
122 | |
123 | llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); | |
124 | if (llcp_sock->ssap == LLCP_MAX_SAP) | |
125 | goto put_dev; | |
126 | ||
127 | local->sockets[llcp_sock->ssap] = llcp_sock; | |
128 | ||
129 | pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); | |
130 | ||
131 | sk->sk_state = LLCP_BOUND; | |
132 | ||
133 | put_dev: | |
134 | nfc_put_device(dev); | |
135 | ||
136 | error: | |
137 | release_sock(sk); | |
138 | return ret; | |
139 | } | |
140 | ||
141 | static int llcp_sock_listen(struct socket *sock, int backlog) | |
142 | { | |
143 | struct sock *sk = sock->sk; | |
144 | int ret = 0; | |
145 | ||
146 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
147 | ||
148 | lock_sock(sk); | |
149 | ||
150 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) | |
427a2eb1 | 151 | || sk->sk_state != LLCP_BOUND) { |
d646960f SO |
152 | ret = -EBADFD; |
153 | goto error; | |
154 | } | |
155 | ||
156 | sk->sk_max_ack_backlog = backlog; | |
157 | sk->sk_ack_backlog = 0; | |
158 | ||
159 | pr_debug("Socket listening\n"); | |
160 | sk->sk_state = LLCP_LISTEN; | |
161 | ||
162 | error: | |
163 | release_sock(sk); | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
168 | void nfc_llcp_accept_unlink(struct sock *sk) | |
169 | { | |
170 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
171 | ||
172 | pr_debug("state %d\n", sk->sk_state); | |
173 | ||
174 | list_del_init(&llcp_sock->accept_queue); | |
175 | sk_acceptq_removed(llcp_sock->parent); | |
176 | llcp_sock->parent = NULL; | |
177 | ||
178 | sock_put(sk); | |
179 | } | |
180 | ||
181 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
182 | { | |
183 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
184 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
185 | ||
186 | /* Lock will be free from unlink */ | |
187 | sock_hold(sk); | |
188 | ||
189 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 190 | &llcp_sock_parent->accept_queue); |
d646960f SO |
191 | llcp_sock->parent = parent; |
192 | sk_acceptq_added(parent); | |
193 | } | |
194 | ||
195 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 196 | struct socket *newsock) |
d646960f SO |
197 | { |
198 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
199 | struct sock *sk; | |
200 | ||
201 | llcp_parent = nfc_llcp_sock(parent); | |
202 | ||
203 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 204 | accept_queue) { |
d646960f SO |
205 | sk = &lsk->sk; |
206 | lock_sock(sk); | |
207 | ||
208 | if (sk->sk_state == LLCP_CLOSED) { | |
209 | release_sock(sk); | |
210 | nfc_llcp_accept_unlink(sk); | |
211 | continue; | |
212 | } | |
213 | ||
214 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
215 | nfc_llcp_accept_unlink(sk); | |
216 | if (newsock) | |
217 | sock_graft(sk, newsock); | |
218 | ||
219 | release_sock(sk); | |
220 | ||
221 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
222 | ||
223 | return sk; | |
224 | } | |
225 | ||
226 | release_sock(sk); | |
227 | } | |
228 | ||
229 | return NULL; | |
230 | } | |
231 | ||
232 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
427a2eb1 | 233 | int flags) |
d646960f SO |
234 | { |
235 | DECLARE_WAITQUEUE(wait, current); | |
236 | struct sock *sk = sock->sk, *new_sk; | |
237 | long timeo; | |
238 | int ret = 0; | |
239 | ||
240 | pr_debug("parent %p\n", sk); | |
241 | ||
242 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
243 | ||
244 | if (sk->sk_state != LLCP_LISTEN) { | |
245 | ret = -EBADFD; | |
246 | goto error; | |
247 | } | |
248 | ||
249 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
250 | ||
251 | /* Wait for an incoming connection. */ | |
252 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
253 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
254 | set_current_state(TASK_INTERRUPTIBLE); | |
255 | ||
256 | if (!timeo) { | |
257 | ret = -EAGAIN; | |
258 | break; | |
259 | } | |
260 | ||
261 | if (signal_pending(current)) { | |
262 | ret = sock_intr_errno(timeo); | |
263 | break; | |
264 | } | |
265 | ||
266 | release_sock(sk); | |
267 | timeo = schedule_timeout(timeo); | |
268 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
269 | } | |
270 | __set_current_state(TASK_RUNNING); | |
271 | remove_wait_queue(sk_sleep(sk), &wait); | |
272 | ||
273 | if (ret) | |
274 | goto error; | |
275 | ||
276 | newsock->state = SS_CONNECTED; | |
277 | ||
278 | pr_debug("new socket %p\n", new_sk); | |
279 | ||
280 | error: | |
281 | release_sock(sk); | |
282 | ||
283 | return ret; | |
284 | } | |
285 | ||
286 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *addr, | |
287 | int *len, int peer) | |
288 | { | |
427a2eb1 | 289 | struct sockaddr_nfc_llcp *llcp_addr = (struct sockaddr_nfc_llcp *)addr; |
d646960f SO |
290 | struct sock *sk = sock->sk; |
291 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
292 | ||
293 | pr_debug("%p\n", sk); | |
294 | ||
58d1eab7 SL |
295 | if (llcp_sock == NULL) |
296 | return -EBADFD; | |
297 | ||
d646960f SO |
298 | addr->sa_family = AF_NFC; |
299 | *len = sizeof(struct sockaddr_nfc_llcp); | |
300 | ||
301 | llcp_addr->dev_idx = llcp_sock->dev->idx; | |
302 | llcp_addr->dsap = llcp_sock->dsap; | |
303 | llcp_addr->ssap = llcp_sock->ssap; | |
304 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
305 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 306 | llcp_addr->service_name_len); |
d646960f SO |
307 | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
312 | { | |
313 | struct nfc_llcp_sock *llcp_sock, *n, *parent_sock; | |
314 | struct sock *sk; | |
315 | ||
316 | parent_sock = nfc_llcp_sock(parent); | |
317 | ||
318 | list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue, | |
427a2eb1 | 319 | accept_queue) { |
d646960f SO |
320 | sk = &llcp_sock->sk; |
321 | ||
322 | if (sk->sk_state == LLCP_CONNECTED) | |
323 | return POLLIN | POLLRDNORM; | |
324 | } | |
325 | ||
326 | return 0; | |
327 | } | |
328 | ||
329 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 330 | poll_table *wait) |
d646960f SO |
331 | { |
332 | struct sock *sk = sock->sk; | |
333 | unsigned int mask = 0; | |
334 | ||
335 | pr_debug("%p\n", sk); | |
336 | ||
337 | sock_poll_wait(file, sk_sleep(sk), wait); | |
338 | ||
339 | if (sk->sk_state == LLCP_LISTEN) | |
340 | return llcp_accept_poll(sk); | |
341 | ||
342 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
343 | mask |= POLLERR; | |
344 | ||
345 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
4260c13b | 346 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
347 | |
348 | if (sk->sk_state == LLCP_CLOSED) | |
349 | mask |= POLLHUP; | |
350 | ||
4260c13b SO |
351 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
352 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
353 | ||
354 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
355 | mask |= POLLHUP; | |
356 | ||
357 | if (sock_writeable(sk)) | |
358 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
359 | else | |
360 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
361 | ||
362 | pr_debug("mask 0x%x\n", mask); | |
363 | ||
d646960f SO |
364 | return mask; |
365 | } | |
366 | ||
367 | static int llcp_sock_release(struct socket *sock) | |
368 | { | |
369 | struct sock *sk = sock->sk; | |
370 | struct nfc_llcp_local *local; | |
371 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 372 | int err = 0; |
d646960f SO |
373 | |
374 | if (!sk) | |
375 | return 0; | |
376 | ||
377 | pr_debug("%p\n", sk); | |
378 | ||
379 | local = llcp_sock->local; | |
40c75f81 SO |
380 | if (local == NULL) { |
381 | err = -ENODEV; | |
382 | goto out; | |
383 | } | |
d646960f SO |
384 | |
385 | mutex_lock(&local->socket_lock); | |
386 | ||
0c318359 | 387 | if (llcp_sock == local->sockets[llcp_sock->ssap]) |
d646960f | 388 | local->sockets[llcp_sock->ssap] = NULL; |
0c318359 | 389 | else |
40c75f81 | 390 | list_del_init(&llcp_sock->list); |
d646960f SO |
391 | |
392 | mutex_unlock(&local->socket_lock); | |
393 | ||
394 | lock_sock(sk); | |
395 | ||
396 | /* Send a DISC */ | |
397 | if (sk->sk_state == LLCP_CONNECTED) | |
398 | nfc_llcp_disconnect(llcp_sock); | |
399 | ||
400 | if (sk->sk_state == LLCP_LISTEN) { | |
401 | struct nfc_llcp_sock *lsk, *n; | |
402 | struct sock *accept_sk; | |
403 | ||
404 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 405 | accept_queue) { |
d646960f SO |
406 | accept_sk = &lsk->sk; |
407 | lock_sock(accept_sk); | |
408 | ||
409 | nfc_llcp_disconnect(lsk); | |
410 | nfc_llcp_accept_unlink(accept_sk); | |
411 | ||
412 | release_sock(accept_sk); | |
413 | ||
d646960f | 414 | sock_orphan(accept_sk); |
d646960f SO |
415 | } |
416 | } | |
417 | ||
418 | /* Freeing the SAP */ | |
419 | if ((sk->sk_state == LLCP_CONNECTED | |
427a2eb1 SO |
420 | && llcp_sock->ssap > LLCP_LOCAL_SAP_OFFSET) || |
421 | sk->sk_state == LLCP_BOUND || sk->sk_state == LLCP_LISTEN) | |
d646960f SO |
422 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); |
423 | ||
d646960f SO |
424 | release_sock(sk); |
425 | ||
40c75f81 | 426 | out: |
d646960f SO |
427 | sock_orphan(sk); |
428 | sock_put(sk); | |
429 | ||
40c75f81 | 430 | return err; |
d646960f SO |
431 | } |
432 | ||
433 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 434 | int len, int flags) |
d646960f SO |
435 | { |
436 | struct sock *sk = sock->sk; | |
437 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
438 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
439 | struct nfc_dev *dev; | |
440 | struct nfc_llcp_local *local; | |
441 | int ret = 0; | |
442 | ||
443 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
444 | ||
445 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
427a2eb1 | 446 | addr->sa_family != AF_NFC) { |
d646960f SO |
447 | pr_err("Invalid socket\n"); |
448 | return -EINVAL; | |
449 | } | |
450 | ||
451 | if (addr->service_name_len == 0 && addr->dsap == 0) { | |
452 | pr_err("Missing service name or dsap\n"); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 457 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
458 | |
459 | lock_sock(sk); | |
460 | ||
461 | if (sk->sk_state == LLCP_CONNECTED) { | |
462 | ret = -EISCONN; | |
463 | goto error; | |
464 | } | |
465 | ||
466 | dev = nfc_get_device(addr->dev_idx); | |
467 | if (dev == NULL) { | |
468 | ret = -ENODEV; | |
469 | goto error; | |
470 | } | |
471 | ||
472 | local = nfc_llcp_find_local(dev); | |
473 | if (local == NULL) { | |
474 | ret = -ENODEV; | |
475 | goto put_dev; | |
476 | } | |
477 | ||
478 | device_lock(&dev->dev); | |
479 | if (dev->dep_link_up == false) { | |
480 | ret = -ENOLINK; | |
481 | device_unlock(&dev->dev); | |
482 | goto put_dev; | |
483 | } | |
484 | device_unlock(&dev->dev); | |
485 | ||
486 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 487 | addr->target_idx != local->target_idx) { |
d646960f SO |
488 | ret = -ENOLINK; |
489 | goto put_dev; | |
490 | } | |
491 | ||
492 | llcp_sock->dev = dev; | |
493 | llcp_sock->local = local; | |
494 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); | |
495 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
496 | ret = -ENOMEM; | |
497 | goto put_dev; | |
498 | } | |
499 | if (addr->service_name_len == 0) | |
500 | llcp_sock->dsap = addr->dsap; | |
501 | else | |
502 | llcp_sock->dsap = LLCP_SAP_SDP; | |
503 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
504 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
505 | addr->service_name_len, |
506 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 507 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
508 | llcp_sock->service_name_len, |
509 | GFP_KERNEL); | |
d646960f SO |
510 | |
511 | local->sockets[llcp_sock->ssap] = llcp_sock; | |
512 | ||
513 | ret = nfc_llcp_send_connect(llcp_sock); | |
514 | if (ret) | |
515 | goto put_dev; | |
516 | ||
ff353d86 SO |
517 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
518 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
519 | if (ret) | |
520 | goto put_dev; | |
d646960f SO |
521 | |
522 | release_sock(sk); | |
ff353d86 | 523 | |
d646960f SO |
524 | return 0; |
525 | ||
526 | put_dev: | |
527 | nfc_put_device(dev); | |
528 | ||
529 | error: | |
530 | release_sock(sk); | |
531 | return ret; | |
532 | } | |
533 | ||
53a0ac2e | 534 | static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
427a2eb1 | 535 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
536 | { |
537 | struct sock *sk = sock->sk; | |
538 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
539 | int ret; | |
540 | ||
541 | pr_debug("sock %p sk %p", sock, sk); | |
542 | ||
543 | ret = sock_error(sk); | |
544 | if (ret) | |
545 | return ret; | |
546 | ||
547 | if (msg->msg_flags & MSG_OOB) | |
548 | return -EOPNOTSUPP; | |
549 | ||
550 | lock_sock(sk); | |
551 | ||
552 | if (sk->sk_state != LLCP_CONNECTED) { | |
553 | release_sock(sk); | |
554 | return -ENOTCONN; | |
555 | } | |
556 | ||
557 | release_sock(sk); | |
558 | ||
559 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
560 | } | |
561 | ||
d646960f SO |
562 | static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
563 | struct msghdr *msg, size_t len, int flags) | |
564 | { | |
565 | int noblock = flags & MSG_DONTWAIT; | |
566 | struct sock *sk = sock->sk; | |
567 | unsigned int copied, rlen; | |
568 | struct sk_buff *skb, *cskb; | |
569 | int err = 0; | |
570 | ||
571 | pr_debug("%p %zu\n", sk, len); | |
572 | ||
573 | lock_sock(sk); | |
574 | ||
575 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 576 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
577 | release_sock(sk); |
578 | return 0; | |
579 | } | |
580 | ||
581 | release_sock(sk); | |
582 | ||
583 | if (flags & (MSG_OOB)) | |
584 | return -EOPNOTSUPP; | |
585 | ||
586 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
587 | if (!skb) { | |
588 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 589 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
590 | |
591 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
592 | return 0; | |
593 | ||
594 | return err; | |
595 | } | |
596 | ||
427a2eb1 | 597 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
598 | copied = min_t(unsigned int, rlen, len); |
599 | ||
600 | cskb = skb; | |
601 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
602 | if (!(flags & MSG_PEEK)) | |
603 | skb_queue_head(&sk->sk_receive_queue, skb); | |
604 | return -EFAULT; | |
605 | } | |
606 | ||
607 | /* Mark read part of skb as used */ | |
608 | if (!(flags & MSG_PEEK)) { | |
609 | ||
610 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
611 | if (sk->sk_type == SOCK_STREAM) { | |
612 | skb_pull(skb, copied); | |
613 | if (skb->len) { | |
614 | skb_queue_head(&sk->sk_receive_queue, skb); | |
615 | goto done; | |
616 | } | |
617 | } | |
618 | ||
619 | kfree_skb(skb); | |
620 | } | |
621 | ||
622 | /* XXX Queue backlogged skbs */ | |
623 | ||
624 | done: | |
625 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
626 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
627 | copied = rlen; | |
628 | ||
629 | return copied; | |
630 | } | |
631 | ||
632 | static const struct proto_ops llcp_sock_ops = { | |
633 | .family = PF_NFC, | |
634 | .owner = THIS_MODULE, | |
635 | .bind = llcp_sock_bind, | |
636 | .connect = llcp_sock_connect, | |
637 | .release = llcp_sock_release, | |
638 | .socketpair = sock_no_socketpair, | |
639 | .accept = llcp_sock_accept, | |
640 | .getname = llcp_sock_getname, | |
641 | .poll = llcp_sock_poll, | |
642 | .ioctl = sock_no_ioctl, | |
643 | .listen = llcp_sock_listen, | |
644 | .shutdown = sock_no_shutdown, | |
645 | .setsockopt = sock_no_setsockopt, | |
646 | .getsockopt = sock_no_getsockopt, | |
53a0ac2e | 647 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
648 | .recvmsg = llcp_sock_recvmsg, |
649 | .mmap = sock_no_mmap, | |
650 | }; | |
651 | ||
652 | static void llcp_sock_destruct(struct sock *sk) | |
653 | { | |
654 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
655 | ||
656 | pr_debug("%p\n", sk); | |
657 | ||
658 | if (sk->sk_state == LLCP_CONNECTED) | |
659 | nfc_put_device(llcp_sock->dev); | |
660 | ||
661 | skb_queue_purge(&sk->sk_receive_queue); | |
662 | ||
663 | nfc_llcp_sock_free(llcp_sock); | |
664 | ||
665 | if (!sock_flag(sk, SOCK_DEAD)) { | |
666 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
667 | return; | |
668 | } | |
669 | } | |
670 | ||
671 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) | |
672 | { | |
673 | struct sock *sk; | |
674 | struct nfc_llcp_sock *llcp_sock; | |
675 | ||
676 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto); | |
677 | if (!sk) | |
678 | return NULL; | |
679 | ||
680 | llcp_sock = nfc_llcp_sock(sk); | |
681 | ||
682 | sock_init_data(sock, sk); | |
683 | sk->sk_state = LLCP_CLOSED; | |
684 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
685 | sk->sk_type = type; | |
686 | sk->sk_destruct = llcp_sock_destruct; | |
687 | ||
688 | llcp_sock->ssap = 0; | |
689 | llcp_sock->dsap = LLCP_SAP_SDP; | |
690 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; | |
691 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
692 | llcp_sock->remote_ready = 1; | |
693 | skb_queue_head_init(&llcp_sock->tx_queue); | |
694 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
695 | skb_queue_head_init(&llcp_sock->tx_backlog_queue); | |
696 | INIT_LIST_HEAD(&llcp_sock->list); | |
697 | INIT_LIST_HEAD(&llcp_sock->accept_queue); | |
698 | ||
699 | if (sock != NULL) | |
700 | sock->state = SS_UNCONNECTED; | |
701 | ||
702 | return sk; | |
703 | } | |
704 | ||
705 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
706 | { | |
40c75f81 SO |
707 | struct nfc_llcp_local *local = sock->local; |
708 | ||
d646960f SO |
709 | kfree(sock->service_name); |
710 | ||
711 | skb_queue_purge(&sock->tx_queue); | |
712 | skb_queue_purge(&sock->tx_pending_queue); | |
713 | skb_queue_purge(&sock->tx_backlog_queue); | |
714 | ||
715 | list_del_init(&sock->accept_queue); | |
716 | ||
40c75f81 SO |
717 | if (local != NULL && sock == local->sockets[sock->ssap]) |
718 | local->sockets[sock->ssap] = NULL; | |
719 | else | |
720 | list_del_init(&sock->list); | |
721 | ||
d646960f SO |
722 | sock->parent = NULL; |
723 | } | |
724 | ||
725 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
427a2eb1 | 726 | const struct nfc_protocol *nfc_proto) |
d646960f SO |
727 | { |
728 | struct sock *sk; | |
729 | ||
730 | pr_debug("%p\n", sock); | |
731 | ||
732 | if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM) | |
733 | return -ESOCKTNOSUPPORT; | |
734 | ||
735 | sock->ops = &llcp_sock_ops; | |
736 | ||
737 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC); | |
738 | if (sk == NULL) | |
739 | return -ENOMEM; | |
740 | ||
741 | return 0; | |
742 | } | |
743 | ||
744 | static const struct nfc_protocol llcp_nfc_proto = { | |
745 | .id = NFC_SOCKPROTO_LLCP, | |
746 | .proto = &llcp_sock_proto, | |
747 | .owner = THIS_MODULE, | |
748 | .create = llcp_sock_create | |
749 | }; | |
750 | ||
751 | int __init nfc_llcp_sock_init(void) | |
752 | { | |
753 | return nfc_proto_register(&llcp_nfc_proto); | |
754 | } | |
755 | ||
756 | void nfc_llcp_sock_exit(void) | |
757 | { | |
758 | nfc_proto_unregister(&llcp_nfc_proto); | |
759 | } |