Commit | Line | Data |
---|---|---|
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; | |
c7aa1225 | 114 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
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 | ||
a69f32af | 127 | nfc_llcp_sock_link(&local->sockets, sk); |
d646960f SO |
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 | ||
295 | addr->sa_family = AF_NFC; | |
296 | *len = sizeof(struct sockaddr_nfc_llcp); | |
297 | ||
298 | llcp_addr->dev_idx = llcp_sock->dev->idx; | |
299 | llcp_addr->dsap = llcp_sock->dsap; | |
300 | llcp_addr->ssap = llcp_sock->ssap; | |
301 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
302 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 303 | llcp_addr->service_name_len); |
d646960f SO |
304 | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
309 | { | |
310 | struct nfc_llcp_sock *llcp_sock, *n, *parent_sock; | |
311 | struct sock *sk; | |
312 | ||
313 | parent_sock = nfc_llcp_sock(parent); | |
314 | ||
315 | list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue, | |
427a2eb1 | 316 | accept_queue) { |
d646960f SO |
317 | sk = &llcp_sock->sk; |
318 | ||
319 | if (sk->sk_state == LLCP_CONNECTED) | |
320 | return POLLIN | POLLRDNORM; | |
321 | } | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 327 | poll_table *wait) |
d646960f SO |
328 | { |
329 | struct sock *sk = sock->sk; | |
330 | unsigned int mask = 0; | |
331 | ||
332 | pr_debug("%p\n", sk); | |
333 | ||
334 | sock_poll_wait(file, sk_sleep(sk), wait); | |
335 | ||
336 | if (sk->sk_state == LLCP_LISTEN) | |
337 | return llcp_accept_poll(sk); | |
338 | ||
339 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
340 | mask |= POLLERR; | |
341 | ||
342 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
4260c13b | 343 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
344 | |
345 | if (sk->sk_state == LLCP_CLOSED) | |
346 | mask |= POLLHUP; | |
347 | ||
4260c13b SO |
348 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
349 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
350 | ||
351 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
352 | mask |= POLLHUP; | |
353 | ||
354 | if (sock_writeable(sk)) | |
355 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
356 | else | |
357 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
358 | ||
359 | pr_debug("mask 0x%x\n", mask); | |
360 | ||
d646960f SO |
361 | return mask; |
362 | } | |
363 | ||
364 | static int llcp_sock_release(struct socket *sock) | |
365 | { | |
366 | struct sock *sk = sock->sk; | |
367 | struct nfc_llcp_local *local; | |
368 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 369 | int err = 0; |
d646960f SO |
370 | |
371 | if (!sk) | |
372 | return 0; | |
373 | ||
374 | pr_debug("%p\n", sk); | |
375 | ||
376 | local = llcp_sock->local; | |
40c75f81 SO |
377 | if (local == NULL) { |
378 | err = -ENODEV; | |
379 | goto out; | |
380 | } | |
d646960f | 381 | |
d646960f SO |
382 | lock_sock(sk); |
383 | ||
384 | /* Send a DISC */ | |
385 | if (sk->sk_state == LLCP_CONNECTED) | |
386 | nfc_llcp_disconnect(llcp_sock); | |
387 | ||
388 | if (sk->sk_state == LLCP_LISTEN) { | |
389 | struct nfc_llcp_sock *lsk, *n; | |
390 | struct sock *accept_sk; | |
391 | ||
392 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 393 | accept_queue) { |
d646960f SO |
394 | accept_sk = &lsk->sk; |
395 | lock_sock(accept_sk); | |
396 | ||
397 | nfc_llcp_disconnect(lsk); | |
398 | nfc_llcp_accept_unlink(accept_sk); | |
399 | ||
400 | release_sock(accept_sk); | |
401 | ||
d646960f | 402 | sock_orphan(accept_sk); |
d646960f SO |
403 | } |
404 | } | |
405 | ||
a69f32af | 406 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); |
d646960f | 407 | |
d646960f SO |
408 | release_sock(sk); |
409 | ||
a69f32af SO |
410 | nfc_llcp_sock_unlink(&local->sockets, sk); |
411 | ||
40c75f81 | 412 | out: |
d646960f SO |
413 | sock_orphan(sk); |
414 | sock_put(sk); | |
415 | ||
40c75f81 | 416 | return err; |
d646960f SO |
417 | } |
418 | ||
419 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 420 | int len, int flags) |
d646960f SO |
421 | { |
422 | struct sock *sk = sock->sk; | |
423 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
424 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
425 | struct nfc_dev *dev; | |
426 | struct nfc_llcp_local *local; | |
427 | int ret = 0; | |
428 | ||
429 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
430 | ||
431 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
427a2eb1 | 432 | addr->sa_family != AF_NFC) { |
d646960f SO |
433 | pr_err("Invalid socket\n"); |
434 | return -EINVAL; | |
435 | } | |
436 | ||
437 | if (addr->service_name_len == 0 && addr->dsap == 0) { | |
438 | pr_err("Missing service name or dsap\n"); | |
439 | return -EINVAL; | |
440 | } | |
441 | ||
442 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 443 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
444 | |
445 | lock_sock(sk); | |
446 | ||
447 | if (sk->sk_state == LLCP_CONNECTED) { | |
448 | ret = -EISCONN; | |
449 | goto error; | |
450 | } | |
451 | ||
452 | dev = nfc_get_device(addr->dev_idx); | |
453 | if (dev == NULL) { | |
454 | ret = -ENODEV; | |
455 | goto error; | |
456 | } | |
457 | ||
458 | local = nfc_llcp_find_local(dev); | |
459 | if (local == NULL) { | |
460 | ret = -ENODEV; | |
461 | goto put_dev; | |
462 | } | |
463 | ||
464 | device_lock(&dev->dev); | |
465 | if (dev->dep_link_up == false) { | |
466 | ret = -ENOLINK; | |
467 | device_unlock(&dev->dev); | |
468 | goto put_dev; | |
469 | } | |
470 | device_unlock(&dev->dev); | |
471 | ||
472 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 473 | addr->target_idx != local->target_idx) { |
d646960f SO |
474 | ret = -ENOLINK; |
475 | goto put_dev; | |
476 | } | |
477 | ||
478 | llcp_sock->dev = dev; | |
c7aa1225 | 479 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
480 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
481 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
482 | ret = -ENOMEM; | |
483 | goto put_dev; | |
484 | } | |
485 | if (addr->service_name_len == 0) | |
486 | llcp_sock->dsap = addr->dsap; | |
487 | else | |
488 | llcp_sock->dsap = LLCP_SAP_SDP; | |
489 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
490 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
491 | addr->service_name_len, |
492 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 493 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
494 | llcp_sock->service_name_len, |
495 | GFP_KERNEL); | |
d646960f | 496 | |
a69f32af | 497 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
498 | |
499 | ret = nfc_llcp_send_connect(llcp_sock); | |
500 | if (ret) | |
a69f32af | 501 | goto sock_unlink; |
d646960f | 502 | |
ff353d86 SO |
503 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
504 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
505 | if (ret) | |
a69f32af | 506 | goto sock_unlink; |
d646960f SO |
507 | |
508 | release_sock(sk); | |
ff353d86 | 509 | |
d646960f SO |
510 | return 0; |
511 | ||
a69f32af SO |
512 | sock_unlink: |
513 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
514 | ||
515 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
516 | ||
d646960f SO |
517 | put_dev: |
518 | nfc_put_device(dev); | |
519 | ||
520 | error: | |
521 | release_sock(sk); | |
522 | return ret; | |
523 | } | |
524 | ||
53a0ac2e | 525 | static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
427a2eb1 | 526 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
527 | { |
528 | struct sock *sk = sock->sk; | |
529 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
530 | int ret; | |
531 | ||
532 | pr_debug("sock %p sk %p", sock, sk); | |
533 | ||
534 | ret = sock_error(sk); | |
535 | if (ret) | |
536 | return ret; | |
537 | ||
538 | if (msg->msg_flags & MSG_OOB) | |
539 | return -EOPNOTSUPP; | |
540 | ||
541 | lock_sock(sk); | |
542 | ||
543 | if (sk->sk_state != LLCP_CONNECTED) { | |
544 | release_sock(sk); | |
545 | return -ENOTCONN; | |
546 | } | |
547 | ||
548 | release_sock(sk); | |
549 | ||
550 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
551 | } | |
552 | ||
d646960f SO |
553 | static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
554 | struct msghdr *msg, size_t len, int flags) | |
555 | { | |
556 | int noblock = flags & MSG_DONTWAIT; | |
557 | struct sock *sk = sock->sk; | |
558 | unsigned int copied, rlen; | |
559 | struct sk_buff *skb, *cskb; | |
560 | int err = 0; | |
561 | ||
562 | pr_debug("%p %zu\n", sk, len); | |
563 | ||
564 | lock_sock(sk); | |
565 | ||
566 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 567 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
568 | release_sock(sk); |
569 | return 0; | |
570 | } | |
571 | ||
572 | release_sock(sk); | |
573 | ||
574 | if (flags & (MSG_OOB)) | |
575 | return -EOPNOTSUPP; | |
576 | ||
577 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
578 | if (!skb) { | |
579 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 580 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
581 | |
582 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
583 | return 0; | |
584 | ||
585 | return err; | |
586 | } | |
587 | ||
427a2eb1 | 588 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
589 | copied = min_t(unsigned int, rlen, len); |
590 | ||
591 | cskb = skb; | |
592 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
593 | if (!(flags & MSG_PEEK)) | |
594 | skb_queue_head(&sk->sk_receive_queue, skb); | |
595 | return -EFAULT; | |
596 | } | |
597 | ||
598 | /* Mark read part of skb as used */ | |
599 | if (!(flags & MSG_PEEK)) { | |
600 | ||
601 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
602 | if (sk->sk_type == SOCK_STREAM) { | |
603 | skb_pull(skb, copied); | |
604 | if (skb->len) { | |
605 | skb_queue_head(&sk->sk_receive_queue, skb); | |
606 | goto done; | |
607 | } | |
608 | } | |
609 | ||
610 | kfree_skb(skb); | |
611 | } | |
612 | ||
613 | /* XXX Queue backlogged skbs */ | |
614 | ||
615 | done: | |
616 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
617 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
618 | copied = rlen; | |
619 | ||
620 | return copied; | |
621 | } | |
622 | ||
623 | static const struct proto_ops llcp_sock_ops = { | |
624 | .family = PF_NFC, | |
625 | .owner = THIS_MODULE, | |
626 | .bind = llcp_sock_bind, | |
627 | .connect = llcp_sock_connect, | |
628 | .release = llcp_sock_release, | |
629 | .socketpair = sock_no_socketpair, | |
630 | .accept = llcp_sock_accept, | |
631 | .getname = llcp_sock_getname, | |
632 | .poll = llcp_sock_poll, | |
633 | .ioctl = sock_no_ioctl, | |
634 | .listen = llcp_sock_listen, | |
635 | .shutdown = sock_no_shutdown, | |
636 | .setsockopt = sock_no_setsockopt, | |
637 | .getsockopt = sock_no_getsockopt, | |
53a0ac2e | 638 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
639 | .recvmsg = llcp_sock_recvmsg, |
640 | .mmap = sock_no_mmap, | |
641 | }; | |
642 | ||
643 | static void llcp_sock_destruct(struct sock *sk) | |
644 | { | |
645 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
646 | ||
647 | pr_debug("%p\n", sk); | |
648 | ||
649 | if (sk->sk_state == LLCP_CONNECTED) | |
650 | nfc_put_device(llcp_sock->dev); | |
651 | ||
652 | skb_queue_purge(&sk->sk_receive_queue); | |
653 | ||
654 | nfc_llcp_sock_free(llcp_sock); | |
655 | ||
656 | if (!sock_flag(sk, SOCK_DEAD)) { | |
657 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
658 | return; | |
659 | } | |
660 | } | |
661 | ||
662 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) | |
663 | { | |
664 | struct sock *sk; | |
665 | struct nfc_llcp_sock *llcp_sock; | |
666 | ||
667 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto); | |
668 | if (!sk) | |
669 | return NULL; | |
670 | ||
671 | llcp_sock = nfc_llcp_sock(sk); | |
672 | ||
673 | sock_init_data(sock, sk); | |
674 | sk->sk_state = LLCP_CLOSED; | |
675 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
676 | sk->sk_type = type; | |
677 | sk->sk_destruct = llcp_sock_destruct; | |
678 | ||
679 | llcp_sock->ssap = 0; | |
680 | llcp_sock->dsap = LLCP_SAP_SDP; | |
681 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; | |
682 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
683 | llcp_sock->remote_ready = 1; | |
684 | skb_queue_head_init(&llcp_sock->tx_queue); | |
685 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
686 | skb_queue_head_init(&llcp_sock->tx_backlog_queue); | |
d646960f SO |
687 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
688 | ||
689 | if (sock != NULL) | |
690 | sock->state = SS_UNCONNECTED; | |
691 | ||
692 | return sk; | |
693 | } | |
694 | ||
695 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
696 | { | |
697 | kfree(sock->service_name); | |
698 | ||
699 | skb_queue_purge(&sock->tx_queue); | |
700 | skb_queue_purge(&sock->tx_pending_queue); | |
701 | skb_queue_purge(&sock->tx_backlog_queue); | |
702 | ||
703 | list_del_init(&sock->accept_queue); | |
40c75f81 | 704 | |
d646960f | 705 | sock->parent = NULL; |
c7aa1225 SO |
706 | |
707 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
708 | } |
709 | ||
710 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
427a2eb1 | 711 | const struct nfc_protocol *nfc_proto) |
d646960f SO |
712 | { |
713 | struct sock *sk; | |
714 | ||
715 | pr_debug("%p\n", sock); | |
716 | ||
717 | if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM) | |
718 | return -ESOCKTNOSUPPORT; | |
719 | ||
720 | sock->ops = &llcp_sock_ops; | |
721 | ||
722 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC); | |
723 | if (sk == NULL) | |
724 | return -ENOMEM; | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | static const struct nfc_protocol llcp_nfc_proto = { | |
730 | .id = NFC_SOCKPROTO_LLCP, | |
731 | .proto = &llcp_sock_proto, | |
732 | .owner = THIS_MODULE, | |
733 | .create = llcp_sock_create | |
734 | }; | |
735 | ||
736 | int __init nfc_llcp_sock_init(void) | |
737 | { | |
738 | return nfc_proto_register(&llcp_nfc_proto); | |
739 | } | |
740 | ||
741 | void nfc_llcp_sock_exit(void) | |
742 | { | |
743 | nfc_proto_unregister(&llcp_nfc_proto); | |
744 | } |