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 | ||
d646960f SO |
81 | if (!addr || addr->sa_family != AF_NFC) |
82 | return -EINVAL; | |
83 | ||
c66433dc SO |
84 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); |
85 | ||
d646960f SO |
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); | |
8b7e8eda SO |
124 | if (llcp_sock->ssap == LLCP_SAP_MAX) { |
125 | ret = -EADDRINUSE; | |
d646960f | 126 | goto put_dev; |
8b7e8eda | 127 | } |
d646960f | 128 | |
cbbf4721 SO |
129 | llcp_sock->reserved_ssap = llcp_sock->ssap; |
130 | ||
a69f32af | 131 | nfc_llcp_sock_link(&local->sockets, sk); |
d646960f SO |
132 | |
133 | pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); | |
134 | ||
135 | sk->sk_state = LLCP_BOUND; | |
136 | ||
137 | put_dev: | |
138 | nfc_put_device(dev); | |
139 | ||
140 | error: | |
141 | release_sock(sk); | |
142 | return ret; | |
143 | } | |
144 | ||
145 | static int llcp_sock_listen(struct socket *sock, int backlog) | |
146 | { | |
147 | struct sock *sk = sock->sk; | |
148 | int ret = 0; | |
149 | ||
150 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
151 | ||
152 | lock_sock(sk); | |
153 | ||
154 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) | |
427a2eb1 | 155 | || sk->sk_state != LLCP_BOUND) { |
d646960f SO |
156 | ret = -EBADFD; |
157 | goto error; | |
158 | } | |
159 | ||
160 | sk->sk_max_ack_backlog = backlog; | |
161 | sk->sk_ack_backlog = 0; | |
162 | ||
163 | pr_debug("Socket listening\n"); | |
164 | sk->sk_state = LLCP_LISTEN; | |
165 | ||
166 | error: | |
167 | release_sock(sk); | |
168 | ||
169 | return ret; | |
170 | } | |
171 | ||
172 | void nfc_llcp_accept_unlink(struct sock *sk) | |
173 | { | |
174 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
175 | ||
176 | pr_debug("state %d\n", sk->sk_state); | |
177 | ||
178 | list_del_init(&llcp_sock->accept_queue); | |
179 | sk_acceptq_removed(llcp_sock->parent); | |
180 | llcp_sock->parent = NULL; | |
181 | ||
182 | sock_put(sk); | |
183 | } | |
184 | ||
185 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
186 | { | |
187 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
188 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
189 | ||
190 | /* Lock will be free from unlink */ | |
191 | sock_hold(sk); | |
192 | ||
193 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 194 | &llcp_sock_parent->accept_queue); |
d646960f SO |
195 | llcp_sock->parent = parent; |
196 | sk_acceptq_added(parent); | |
197 | } | |
198 | ||
199 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 200 | struct socket *newsock) |
d646960f SO |
201 | { |
202 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
203 | struct sock *sk; | |
204 | ||
205 | llcp_parent = nfc_llcp_sock(parent); | |
206 | ||
207 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 208 | accept_queue) { |
d646960f SO |
209 | sk = &lsk->sk; |
210 | lock_sock(sk); | |
211 | ||
212 | if (sk->sk_state == LLCP_CLOSED) { | |
213 | release_sock(sk); | |
214 | nfc_llcp_accept_unlink(sk); | |
215 | continue; | |
216 | } | |
217 | ||
218 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
219 | nfc_llcp_accept_unlink(sk); | |
220 | if (newsock) | |
221 | sock_graft(sk, newsock); | |
222 | ||
223 | release_sock(sk); | |
224 | ||
225 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
226 | ||
227 | return sk; | |
228 | } | |
229 | ||
230 | release_sock(sk); | |
231 | } | |
232 | ||
233 | return NULL; | |
234 | } | |
235 | ||
236 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
427a2eb1 | 237 | int flags) |
d646960f SO |
238 | { |
239 | DECLARE_WAITQUEUE(wait, current); | |
240 | struct sock *sk = sock->sk, *new_sk; | |
241 | long timeo; | |
242 | int ret = 0; | |
243 | ||
244 | pr_debug("parent %p\n", sk); | |
245 | ||
246 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
247 | ||
248 | if (sk->sk_state != LLCP_LISTEN) { | |
249 | ret = -EBADFD; | |
250 | goto error; | |
251 | } | |
252 | ||
253 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
254 | ||
255 | /* Wait for an incoming connection. */ | |
256 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
257 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
258 | set_current_state(TASK_INTERRUPTIBLE); | |
259 | ||
260 | if (!timeo) { | |
261 | ret = -EAGAIN; | |
262 | break; | |
263 | } | |
264 | ||
265 | if (signal_pending(current)) { | |
266 | ret = sock_intr_errno(timeo); | |
267 | break; | |
268 | } | |
269 | ||
270 | release_sock(sk); | |
271 | timeo = schedule_timeout(timeo); | |
272 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
273 | } | |
274 | __set_current_state(TASK_RUNNING); | |
275 | remove_wait_queue(sk_sleep(sk), &wait); | |
276 | ||
277 | if (ret) | |
278 | goto error; | |
279 | ||
280 | newsock->state = SS_CONNECTED; | |
281 | ||
282 | pr_debug("new socket %p\n", new_sk); | |
283 | ||
284 | error: | |
285 | release_sock(sk); | |
286 | ||
287 | return ret; | |
288 | } | |
289 | ||
12e5bdfe | 290 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, |
d646960f SO |
291 | int *len, int peer) |
292 | { | |
d646960f SO |
293 | struct sock *sk = sock->sk; |
294 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
12e5bdfe | 295 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); |
d646960f | 296 | |
12e5bdfe SO |
297 | pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, |
298 | llcp_sock->dsap, llcp_sock->ssap); | |
d646960f | 299 | |
147f20e3 | 300 | if (llcp_sock == NULL || llcp_sock->dev == NULL) |
58d1eab7 SL |
301 | return -EBADFD; |
302 | ||
12e5bdfe SO |
303 | uaddr->sa_family = AF_NFC; |
304 | ||
d646960f SO |
305 | *len = sizeof(struct sockaddr_nfc_llcp); |
306 | ||
307 | llcp_addr->dev_idx = llcp_sock->dev->idx; | |
12e5bdfe | 308 | llcp_addr->target_idx = llcp_sock->target_idx; |
d646960f SO |
309 | llcp_addr->dsap = llcp_sock->dsap; |
310 | llcp_addr->ssap = llcp_sock->ssap; | |
311 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
312 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 313 | llcp_addr->service_name_len); |
d646960f SO |
314 | |
315 | return 0; | |
316 | } | |
317 | ||
318 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
319 | { | |
320 | struct nfc_llcp_sock *llcp_sock, *n, *parent_sock; | |
321 | struct sock *sk; | |
322 | ||
323 | parent_sock = nfc_llcp_sock(parent); | |
324 | ||
325 | list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue, | |
427a2eb1 | 326 | accept_queue) { |
d646960f SO |
327 | sk = &llcp_sock->sk; |
328 | ||
329 | if (sk->sk_state == LLCP_CONNECTED) | |
330 | return POLLIN | POLLRDNORM; | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 337 | poll_table *wait) |
d646960f SO |
338 | { |
339 | struct sock *sk = sock->sk; | |
340 | unsigned int mask = 0; | |
341 | ||
342 | pr_debug("%p\n", sk); | |
343 | ||
344 | sock_poll_wait(file, sk_sleep(sk), wait); | |
345 | ||
346 | if (sk->sk_state == LLCP_LISTEN) | |
347 | return llcp_accept_poll(sk); | |
348 | ||
349 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
350 | mask |= POLLERR; | |
351 | ||
352 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
4260c13b | 353 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
354 | |
355 | if (sk->sk_state == LLCP_CLOSED) | |
356 | mask |= POLLHUP; | |
357 | ||
4260c13b SO |
358 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
359 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
360 | ||
361 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
362 | mask |= POLLHUP; | |
363 | ||
364 | if (sock_writeable(sk)) | |
365 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
366 | else | |
367 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
368 | ||
369 | pr_debug("mask 0x%x\n", mask); | |
370 | ||
d646960f SO |
371 | return mask; |
372 | } | |
373 | ||
374 | static int llcp_sock_release(struct socket *sock) | |
375 | { | |
376 | struct sock *sk = sock->sk; | |
377 | struct nfc_llcp_local *local; | |
378 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 379 | int err = 0; |
d646960f SO |
380 | |
381 | if (!sk) | |
382 | return 0; | |
383 | ||
384 | pr_debug("%p\n", sk); | |
385 | ||
386 | local = llcp_sock->local; | |
40c75f81 SO |
387 | if (local == NULL) { |
388 | err = -ENODEV; | |
389 | goto out; | |
390 | } | |
d646960f | 391 | |
d646960f SO |
392 | lock_sock(sk); |
393 | ||
394 | /* Send a DISC */ | |
395 | if (sk->sk_state == LLCP_CONNECTED) | |
396 | nfc_llcp_disconnect(llcp_sock); | |
397 | ||
398 | if (sk->sk_state == LLCP_LISTEN) { | |
399 | struct nfc_llcp_sock *lsk, *n; | |
400 | struct sock *accept_sk; | |
401 | ||
402 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 403 | accept_queue) { |
d646960f SO |
404 | accept_sk = &lsk->sk; |
405 | lock_sock(accept_sk); | |
406 | ||
407 | nfc_llcp_disconnect(lsk); | |
408 | nfc_llcp_accept_unlink(accept_sk); | |
409 | ||
410 | release_sock(accept_sk); | |
411 | ||
d646960f | 412 | sock_orphan(accept_sk); |
d646960f SO |
413 | } |
414 | } | |
415 | ||
cbbf4721 SO |
416 | if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) |
417 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
d646960f | 418 | |
d646960f SO |
419 | release_sock(sk); |
420 | ||
a69f32af SO |
421 | nfc_llcp_sock_unlink(&local->sockets, sk); |
422 | ||
40c75f81 | 423 | out: |
d646960f SO |
424 | sock_orphan(sk); |
425 | sock_put(sk); | |
426 | ||
40c75f81 | 427 | return err; |
d646960f SO |
428 | } |
429 | ||
430 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 431 | int len, int flags) |
d646960f SO |
432 | { |
433 | struct sock *sk = sock->sk; | |
434 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
435 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
436 | struct nfc_dev *dev; | |
437 | struct nfc_llcp_local *local; | |
438 | int ret = 0; | |
439 | ||
440 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
441 | ||
442 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
427a2eb1 | 443 | addr->sa_family != AF_NFC) { |
d646960f SO |
444 | pr_err("Invalid socket\n"); |
445 | return -EINVAL; | |
446 | } | |
447 | ||
448 | if (addr->service_name_len == 0 && addr->dsap == 0) { | |
449 | pr_err("Missing service name or dsap\n"); | |
450 | return -EINVAL; | |
451 | } | |
452 | ||
453 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 454 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
455 | |
456 | lock_sock(sk); | |
457 | ||
458 | if (sk->sk_state == LLCP_CONNECTED) { | |
459 | ret = -EISCONN; | |
460 | goto error; | |
461 | } | |
462 | ||
463 | dev = nfc_get_device(addr->dev_idx); | |
464 | if (dev == NULL) { | |
465 | ret = -ENODEV; | |
466 | goto error; | |
467 | } | |
468 | ||
469 | local = nfc_llcp_find_local(dev); | |
470 | if (local == NULL) { | |
471 | ret = -ENODEV; | |
472 | goto put_dev; | |
473 | } | |
474 | ||
475 | device_lock(&dev->dev); | |
476 | if (dev->dep_link_up == false) { | |
477 | ret = -ENOLINK; | |
478 | device_unlock(&dev->dev); | |
479 | goto put_dev; | |
480 | } | |
481 | device_unlock(&dev->dev); | |
482 | ||
483 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 484 | addr->target_idx != local->target_idx) { |
d646960f SO |
485 | ret = -ENOLINK; |
486 | goto put_dev; | |
487 | } | |
488 | ||
489 | llcp_sock->dev = dev; | |
c7aa1225 | 490 | llcp_sock->local = nfc_llcp_local_get(local); |
93d7e490 | 491 | llcp_sock->miu = llcp_sock->local->remote_miu; |
d646960f SO |
492 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
493 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
494 | ret = -ENOMEM; | |
495 | goto put_dev; | |
496 | } | |
cbbf4721 SO |
497 | |
498 | llcp_sock->reserved_ssap = llcp_sock->ssap; | |
499 | ||
d646960f SO |
500 | if (addr->service_name_len == 0) |
501 | llcp_sock->dsap = addr->dsap; | |
502 | else | |
503 | llcp_sock->dsap = LLCP_SAP_SDP; | |
504 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
505 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
506 | addr->service_name_len, |
507 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 508 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
509 | llcp_sock->service_name_len, |
510 | GFP_KERNEL); | |
d646960f | 511 | |
a69f32af | 512 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
513 | |
514 | ret = nfc_llcp_send_connect(llcp_sock); | |
515 | if (ret) | |
a69f32af | 516 | goto sock_unlink; |
d646960f | 517 | |
ff353d86 SO |
518 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
519 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
520 | if (ret) | |
a69f32af | 521 | goto sock_unlink; |
d646960f SO |
522 | |
523 | release_sock(sk); | |
ff353d86 | 524 | |
d646960f SO |
525 | return 0; |
526 | ||
a69f32af SO |
527 | sock_unlink: |
528 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
529 | ||
530 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
531 | ||
d646960f SO |
532 | put_dev: |
533 | nfc_put_device(dev); | |
534 | ||
535 | error: | |
536 | release_sock(sk); | |
537 | return ret; | |
538 | } | |
539 | ||
53a0ac2e | 540 | static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
427a2eb1 | 541 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
542 | { |
543 | struct sock *sk = sock->sk; | |
544 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
545 | int ret; | |
546 | ||
547 | pr_debug("sock %p sk %p", sock, sk); | |
548 | ||
549 | ret = sock_error(sk); | |
550 | if (ret) | |
551 | return ret; | |
552 | ||
553 | if (msg->msg_flags & MSG_OOB) | |
554 | return -EOPNOTSUPP; | |
555 | ||
556 | lock_sock(sk); | |
557 | ||
558 | if (sk->sk_state != LLCP_CONNECTED) { | |
559 | release_sock(sk); | |
560 | return -ENOTCONN; | |
561 | } | |
562 | ||
563 | release_sock(sk); | |
564 | ||
565 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
566 | } | |
567 | ||
d646960f SO |
568 | static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
569 | struct msghdr *msg, size_t len, int flags) | |
570 | { | |
571 | int noblock = flags & MSG_DONTWAIT; | |
572 | struct sock *sk = sock->sk; | |
573 | unsigned int copied, rlen; | |
574 | struct sk_buff *skb, *cskb; | |
575 | int err = 0; | |
576 | ||
577 | pr_debug("%p %zu\n", sk, len); | |
578 | ||
579 | lock_sock(sk); | |
580 | ||
581 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 582 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
583 | release_sock(sk); |
584 | return 0; | |
585 | } | |
586 | ||
587 | release_sock(sk); | |
588 | ||
589 | if (flags & (MSG_OOB)) | |
590 | return -EOPNOTSUPP; | |
591 | ||
592 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
593 | if (!skb) { | |
594 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 595 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
596 | |
597 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
598 | return 0; | |
599 | ||
600 | return err; | |
601 | } | |
602 | ||
427a2eb1 | 603 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
604 | copied = min_t(unsigned int, rlen, len); |
605 | ||
606 | cskb = skb; | |
607 | if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { | |
608 | if (!(flags & MSG_PEEK)) | |
609 | skb_queue_head(&sk->sk_receive_queue, skb); | |
610 | return -EFAULT; | |
611 | } | |
612 | ||
613 | /* Mark read part of skb as used */ | |
614 | if (!(flags & MSG_PEEK)) { | |
615 | ||
616 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
617 | if (sk->sk_type == SOCK_STREAM) { | |
618 | skb_pull(skb, copied); | |
619 | if (skb->len) { | |
620 | skb_queue_head(&sk->sk_receive_queue, skb); | |
621 | goto done; | |
622 | } | |
623 | } | |
624 | ||
625 | kfree_skb(skb); | |
626 | } | |
627 | ||
628 | /* XXX Queue backlogged skbs */ | |
629 | ||
630 | done: | |
631 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
632 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
633 | copied = rlen; | |
634 | ||
635 | return copied; | |
636 | } | |
637 | ||
638 | static const struct proto_ops llcp_sock_ops = { | |
639 | .family = PF_NFC, | |
640 | .owner = THIS_MODULE, | |
641 | .bind = llcp_sock_bind, | |
642 | .connect = llcp_sock_connect, | |
643 | .release = llcp_sock_release, | |
644 | .socketpair = sock_no_socketpair, | |
645 | .accept = llcp_sock_accept, | |
646 | .getname = llcp_sock_getname, | |
647 | .poll = llcp_sock_poll, | |
648 | .ioctl = sock_no_ioctl, | |
649 | .listen = llcp_sock_listen, | |
650 | .shutdown = sock_no_shutdown, | |
651 | .setsockopt = sock_no_setsockopt, | |
652 | .getsockopt = sock_no_getsockopt, | |
53a0ac2e | 653 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
654 | .recvmsg = llcp_sock_recvmsg, |
655 | .mmap = sock_no_mmap, | |
656 | }; | |
657 | ||
658 | static void llcp_sock_destruct(struct sock *sk) | |
659 | { | |
660 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
661 | ||
662 | pr_debug("%p\n", sk); | |
663 | ||
664 | if (sk->sk_state == LLCP_CONNECTED) | |
665 | nfc_put_device(llcp_sock->dev); | |
666 | ||
667 | skb_queue_purge(&sk->sk_receive_queue); | |
668 | ||
669 | nfc_llcp_sock_free(llcp_sock); | |
670 | ||
671 | if (!sock_flag(sk, SOCK_DEAD)) { | |
672 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
673 | return; | |
674 | } | |
675 | } | |
676 | ||
677 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) | |
678 | { | |
679 | struct sock *sk; | |
680 | struct nfc_llcp_sock *llcp_sock; | |
681 | ||
682 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto); | |
683 | if (!sk) | |
684 | return NULL; | |
685 | ||
686 | llcp_sock = nfc_llcp_sock(sk); | |
687 | ||
688 | sock_init_data(sock, sk); | |
689 | sk->sk_state = LLCP_CLOSED; | |
690 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
691 | sk->sk_type = type; | |
692 | sk->sk_destruct = llcp_sock_destruct; | |
693 | ||
694 | llcp_sock->ssap = 0; | |
695 | llcp_sock->dsap = LLCP_SAP_SDP; | |
7a06e586 | 696 | llcp_sock->rw = LLCP_DEFAULT_RW; |
93d7e490 | 697 | llcp_sock->miu = LLCP_DEFAULT_MIU; |
d646960f SO |
698 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; |
699 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
700 | llcp_sock->remote_ready = 1; | |
cbbf4721 | 701 | llcp_sock->reserved_ssap = LLCP_SAP_MAX; |
d646960f SO |
702 | skb_queue_head_init(&llcp_sock->tx_queue); |
703 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
704 | skb_queue_head_init(&llcp_sock->tx_backlog_queue); | |
d646960f SO |
705 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
706 | ||
707 | if (sock != NULL) | |
708 | sock->state = SS_UNCONNECTED; | |
709 | ||
710 | return sk; | |
711 | } | |
712 | ||
713 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
714 | { | |
715 | kfree(sock->service_name); | |
716 | ||
717 | skb_queue_purge(&sock->tx_queue); | |
718 | skb_queue_purge(&sock->tx_pending_queue); | |
719 | skb_queue_purge(&sock->tx_backlog_queue); | |
720 | ||
721 | list_del_init(&sock->accept_queue); | |
40c75f81 | 722 | |
d646960f | 723 | sock->parent = NULL; |
c7aa1225 SO |
724 | |
725 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
726 | } |
727 | ||
728 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
427a2eb1 | 729 | const struct nfc_protocol *nfc_proto) |
d646960f SO |
730 | { |
731 | struct sock *sk; | |
732 | ||
733 | pr_debug("%p\n", sock); | |
734 | ||
735 | if (sock->type != SOCK_STREAM && sock->type != SOCK_DGRAM) | |
736 | return -ESOCKTNOSUPPORT; | |
737 | ||
738 | sock->ops = &llcp_sock_ops; | |
739 | ||
740 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC); | |
741 | if (sk == NULL) | |
742 | return -ENOMEM; | |
743 | ||
744 | return 0; | |
745 | } | |
746 | ||
747 | static const struct nfc_protocol llcp_nfc_proto = { | |
748 | .id = NFC_SOCKPROTO_LLCP, | |
749 | .proto = &llcp_sock_proto, | |
750 | .owner = THIS_MODULE, | |
751 | .create = llcp_sock_create | |
752 | }; | |
753 | ||
754 | int __init nfc_llcp_sock_init(void) | |
755 | { | |
756 | return nfc_proto_register(&llcp_nfc_proto); | |
757 | } | |
758 | ||
759 | void nfc_llcp_sock_exit(void) | |
760 | { | |
761 | nfc_proto_unregister(&llcp_nfc_proto); | |
762 | } |