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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 | ||
30cc4587 | 27 | #include "nfc.h" |
d646960f SO |
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 | ||
4463523b TE |
145 | static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr, |
146 | int alen) | |
147 | { | |
148 | struct sock *sk = sock->sk; | |
149 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
150 | struct nfc_llcp_local *local; | |
151 | struct nfc_dev *dev; | |
152 | struct sockaddr_nfc_llcp llcp_addr; | |
153 | int len, ret = 0; | |
154 | ||
155 | if (!addr || addr->sa_family != AF_NFC) | |
156 | return -EINVAL; | |
157 | ||
158 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
159 | ||
160 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
161 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
162 | memcpy(&llcp_addr, addr, len); | |
163 | ||
164 | lock_sock(sk); | |
165 | ||
166 | if (sk->sk_state != LLCP_CLOSED) { | |
167 | ret = -EBADFD; | |
168 | goto error; | |
169 | } | |
170 | ||
171 | dev = nfc_get_device(llcp_addr.dev_idx); | |
172 | if (dev == NULL) { | |
173 | ret = -ENODEV; | |
174 | goto error; | |
175 | } | |
176 | ||
177 | local = nfc_llcp_find_local(dev); | |
178 | if (local == NULL) { | |
179 | ret = -ENODEV; | |
180 | goto put_dev; | |
181 | } | |
182 | ||
183 | llcp_sock->dev = dev; | |
184 | llcp_sock->local = nfc_llcp_local_get(local); | |
185 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
186 | ||
187 | nfc_llcp_sock_link(&local->raw_sockets, sk); | |
188 | ||
189 | sk->sk_state = LLCP_BOUND; | |
190 | ||
191 | put_dev: | |
192 | nfc_put_device(dev); | |
193 | ||
194 | error: | |
195 | release_sock(sk); | |
196 | return ret; | |
197 | } | |
198 | ||
d646960f SO |
199 | static int llcp_sock_listen(struct socket *sock, int backlog) |
200 | { | |
201 | struct sock *sk = sock->sk; | |
202 | int ret = 0; | |
203 | ||
204 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
205 | ||
206 | lock_sock(sk); | |
207 | ||
874934f4 SJ |
208 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) || |
209 | sk->sk_state != LLCP_BOUND) { | |
d646960f SO |
210 | ret = -EBADFD; |
211 | goto error; | |
212 | } | |
213 | ||
214 | sk->sk_max_ack_backlog = backlog; | |
215 | sk->sk_ack_backlog = 0; | |
216 | ||
217 | pr_debug("Socket listening\n"); | |
218 | sk->sk_state = LLCP_LISTEN; | |
219 | ||
220 | error: | |
221 | release_sock(sk); | |
222 | ||
223 | return ret; | |
224 | } | |
225 | ||
26fd76ca SO |
226 | static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname, |
227 | char __user *optval, unsigned int optlen) | |
228 | { | |
229 | struct sock *sk = sock->sk; | |
230 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
231 | u32 opt; | |
232 | int err = 0; | |
233 | ||
234 | pr_debug("%p optname %d\n", sk, optname); | |
235 | ||
236 | if (level != SOL_NFC) | |
237 | return -ENOPROTOOPT; | |
238 | ||
239 | lock_sock(sk); | |
240 | ||
241 | switch (optname) { | |
242 | case NFC_LLCP_RW: | |
243 | if (sk->sk_state == LLCP_CONNECTED || | |
244 | sk->sk_state == LLCP_BOUND || | |
245 | sk->sk_state == LLCP_LISTEN) { | |
246 | err = -EINVAL; | |
247 | break; | |
248 | } | |
249 | ||
250 | if (get_user(opt, (u32 __user *) optval)) { | |
251 | err = -EFAULT; | |
252 | break; | |
253 | } | |
254 | ||
255 | if (opt > LLCP_MAX_RW) { | |
256 | err = -EINVAL; | |
257 | break; | |
258 | } | |
259 | ||
260 | llcp_sock->rw = (u8) opt; | |
261 | ||
262 | break; | |
263 | ||
264 | case NFC_LLCP_MIUX: | |
265 | if (sk->sk_state == LLCP_CONNECTED || | |
266 | sk->sk_state == LLCP_BOUND || | |
267 | sk->sk_state == LLCP_LISTEN) { | |
268 | err = -EINVAL; | |
269 | break; | |
270 | } | |
271 | ||
272 | if (get_user(opt, (u32 __user *) optval)) { | |
273 | err = -EFAULT; | |
274 | break; | |
275 | } | |
276 | ||
277 | if (opt > LLCP_MAX_MIUX) { | |
278 | err = -EINVAL; | |
279 | break; | |
280 | } | |
281 | ||
5eef6669 | 282 | llcp_sock->miux = cpu_to_be16((u16) opt); |
26fd76ca SO |
283 | |
284 | break; | |
285 | ||
286 | default: | |
287 | err = -ENOPROTOOPT; | |
288 | break; | |
289 | } | |
290 | ||
291 | release_sock(sk); | |
292 | ||
06d44f80 SO |
293 | pr_debug("%p rw %d miux %d\n", llcp_sock, |
294 | llcp_sock->rw, llcp_sock->miux); | |
295 | ||
26fd76ca SO |
296 | return err; |
297 | } | |
298 | ||
299 | static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname, | |
300 | char __user *optval, int __user *optlen) | |
301 | { | |
00e856db | 302 | struct nfc_llcp_local *local; |
26fd76ca SO |
303 | struct sock *sk = sock->sk; |
304 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
305 | int len, err = 0; | |
064f370c | 306 | u16 miux, remote_miu; |
00e856db | 307 | u8 rw; |
26fd76ca SO |
308 | |
309 | pr_debug("%p optname %d\n", sk, optname); | |
310 | ||
311 | if (level != SOL_NFC) | |
312 | return -ENOPROTOOPT; | |
313 | ||
314 | if (get_user(len, optlen)) | |
315 | return -EFAULT; | |
316 | ||
00e856db SO |
317 | local = llcp_sock->local; |
318 | if (!local) | |
319 | return -ENODEV; | |
320 | ||
26fd76ca SO |
321 | len = min_t(u32, len, sizeof(u32)); |
322 | ||
323 | lock_sock(sk); | |
324 | ||
325 | switch (optname) { | |
326 | case NFC_LLCP_RW: | |
00e856db SO |
327 | rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw; |
328 | if (put_user(rw, (u32 __user *) optval)) | |
26fd76ca SO |
329 | err = -EFAULT; |
330 | ||
331 | break; | |
332 | ||
333 | case NFC_LLCP_MIUX: | |
00e856db SO |
334 | miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ? |
335 | be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux); | |
336 | ||
337 | if (put_user(miux, (u32 __user *) optval)) | |
26fd76ca SO |
338 | err = -EFAULT; |
339 | ||
340 | break; | |
341 | ||
064f370c TE |
342 | case NFC_LLCP_REMOTE_MIU: |
343 | remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ? | |
344 | local->remote_miu : llcp_sock->remote_miu; | |
345 | ||
346 | if (put_user(remote_miu, (u32 __user *) optval)) | |
347 | err = -EFAULT; | |
348 | ||
349 | break; | |
350 | ||
351 | case NFC_LLCP_REMOTE_LTO: | |
352 | if (put_user(local->remote_lto / 10, (u32 __user *) optval)) | |
353 | err = -EFAULT; | |
354 | ||
355 | break; | |
356 | ||
357 | case NFC_LLCP_REMOTE_RW: | |
358 | if (put_user(llcp_sock->remote_rw, (u32 __user *) optval)) | |
26fd76ca SO |
359 | err = -EFAULT; |
360 | ||
361 | break; | |
362 | ||
363 | default: | |
364 | err = -ENOPROTOOPT; | |
365 | break; | |
366 | } | |
367 | ||
368 | release_sock(sk); | |
369 | ||
370 | if (put_user(len, optlen)) | |
371 | return -EFAULT; | |
372 | ||
373 | return err; | |
374 | } | |
375 | ||
d646960f SO |
376 | void nfc_llcp_accept_unlink(struct sock *sk) |
377 | { | |
378 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
379 | ||
380 | pr_debug("state %d\n", sk->sk_state); | |
381 | ||
382 | list_del_init(&llcp_sock->accept_queue); | |
383 | sk_acceptq_removed(llcp_sock->parent); | |
384 | llcp_sock->parent = NULL; | |
385 | ||
386 | sock_put(sk); | |
387 | } | |
388 | ||
389 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
390 | { | |
391 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
392 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
393 | ||
394 | /* Lock will be free from unlink */ | |
395 | sock_hold(sk); | |
396 | ||
397 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 398 | &llcp_sock_parent->accept_queue); |
d646960f SO |
399 | llcp_sock->parent = parent; |
400 | sk_acceptq_added(parent); | |
401 | } | |
402 | ||
403 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 404 | struct socket *newsock) |
d646960f SO |
405 | { |
406 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
407 | struct sock *sk; | |
408 | ||
409 | llcp_parent = nfc_llcp_sock(parent); | |
410 | ||
411 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 412 | accept_queue) { |
d646960f SO |
413 | sk = &lsk->sk; |
414 | lock_sock(sk); | |
415 | ||
416 | if (sk->sk_state == LLCP_CLOSED) { | |
417 | release_sock(sk); | |
418 | nfc_llcp_accept_unlink(sk); | |
419 | continue; | |
420 | } | |
421 | ||
422 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
39a352a5 SO |
423 | list_del_init(&lsk->accept_queue); |
424 | sock_put(sk); | |
425 | ||
d646960f SO |
426 | if (newsock) |
427 | sock_graft(sk, newsock); | |
428 | ||
429 | release_sock(sk); | |
430 | ||
431 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
432 | ||
b141e811 SO |
433 | sk_acceptq_removed(parent); |
434 | ||
d646960f SO |
435 | return sk; |
436 | } | |
437 | ||
438 | release_sock(sk); | |
439 | } | |
440 | ||
441 | return NULL; | |
442 | } | |
443 | ||
444 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
427a2eb1 | 445 | int flags) |
d646960f SO |
446 | { |
447 | DECLARE_WAITQUEUE(wait, current); | |
448 | struct sock *sk = sock->sk, *new_sk; | |
449 | long timeo; | |
450 | int ret = 0; | |
451 | ||
452 | pr_debug("parent %p\n", sk); | |
453 | ||
454 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
455 | ||
456 | if (sk->sk_state != LLCP_LISTEN) { | |
457 | ret = -EBADFD; | |
458 | goto error; | |
459 | } | |
460 | ||
461 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
462 | ||
463 | /* Wait for an incoming connection. */ | |
464 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
465 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
466 | set_current_state(TASK_INTERRUPTIBLE); | |
467 | ||
468 | if (!timeo) { | |
469 | ret = -EAGAIN; | |
470 | break; | |
471 | } | |
472 | ||
473 | if (signal_pending(current)) { | |
474 | ret = sock_intr_errno(timeo); | |
475 | break; | |
476 | } | |
477 | ||
478 | release_sock(sk); | |
479 | timeo = schedule_timeout(timeo); | |
480 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
481 | } | |
482 | __set_current_state(TASK_RUNNING); | |
483 | remove_wait_queue(sk_sleep(sk), &wait); | |
484 | ||
485 | if (ret) | |
486 | goto error; | |
487 | ||
488 | newsock->state = SS_CONNECTED; | |
489 | ||
490 | pr_debug("new socket %p\n", new_sk); | |
491 | ||
492 | error: | |
493 | release_sock(sk); | |
494 | ||
495 | return ret; | |
496 | } | |
497 | ||
12e5bdfe | 498 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, |
d646960f SO |
499 | int *len, int peer) |
500 | { | |
d646960f SO |
501 | struct sock *sk = sock->sk; |
502 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
12e5bdfe | 503 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); |
d646960f | 504 | |
fe3c094a SO |
505 | if (llcp_sock == NULL || llcp_sock->dev == NULL) |
506 | return -EBADFD; | |
507 | ||
12e5bdfe SO |
508 | pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, |
509 | llcp_sock->dsap, llcp_sock->ssap); | |
d646960f | 510 | |
5ffedc6e | 511 | memset(llcp_addr, 0, sizeof(*llcp_addr)); |
d646960f SO |
512 | *len = sizeof(struct sockaddr_nfc_llcp); |
513 | ||
5ffedc6e | 514 | llcp_addr->sa_family = AF_NFC; |
d646960f | 515 | llcp_addr->dev_idx = llcp_sock->dev->idx; |
12e5bdfe | 516 | llcp_addr->target_idx = llcp_sock->target_idx; |
5ffedc6e | 517 | llcp_addr->nfc_protocol = llcp_sock->nfc_protocol; |
d646960f SO |
518 | llcp_addr->dsap = llcp_sock->dsap; |
519 | llcp_addr->ssap = llcp_sock->ssap; | |
520 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
521 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 522 | llcp_addr->service_name_len); |
d646960f SO |
523 | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
528 | { | |
529 | struct nfc_llcp_sock *llcp_sock, *n, *parent_sock; | |
530 | struct sock *sk; | |
531 | ||
532 | parent_sock = nfc_llcp_sock(parent); | |
533 | ||
534 | list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue, | |
427a2eb1 | 535 | accept_queue) { |
d646960f SO |
536 | sk = &llcp_sock->sk; |
537 | ||
538 | if (sk->sk_state == LLCP_CONNECTED) | |
539 | return POLLIN | POLLRDNORM; | |
540 | } | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 546 | poll_table *wait) |
d646960f SO |
547 | { |
548 | struct sock *sk = sock->sk; | |
549 | unsigned int mask = 0; | |
550 | ||
551 | pr_debug("%p\n", sk); | |
552 | ||
553 | sock_poll_wait(file, sk_sleep(sk), wait); | |
554 | ||
555 | if (sk->sk_state == LLCP_LISTEN) | |
556 | return llcp_accept_poll(sk); | |
557 | ||
558 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 559 | mask |= POLLERR | |
8facd5fb | 560 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
d646960f SO |
561 | |
562 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
4260c13b | 563 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
564 | |
565 | if (sk->sk_state == LLCP_CLOSED) | |
566 | mask |= POLLHUP; | |
567 | ||
4260c13b SO |
568 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
569 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
570 | ||
571 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
572 | mask |= POLLHUP; | |
573 | ||
b4011239 | 574 | if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED) |
4260c13b SO |
575 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
576 | else | |
577 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
578 | ||
579 | pr_debug("mask 0x%x\n", mask); | |
580 | ||
d646960f SO |
581 | return mask; |
582 | } | |
583 | ||
584 | static int llcp_sock_release(struct socket *sock) | |
585 | { | |
586 | struct sock *sk = sock->sk; | |
587 | struct nfc_llcp_local *local; | |
588 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 589 | int err = 0; |
d646960f SO |
590 | |
591 | if (!sk) | |
592 | return 0; | |
593 | ||
594 | pr_debug("%p\n", sk); | |
595 | ||
596 | local = llcp_sock->local; | |
40c75f81 SO |
597 | if (local == NULL) { |
598 | err = -ENODEV; | |
599 | goto out; | |
600 | } | |
d646960f | 601 | |
d646960f SO |
602 | lock_sock(sk); |
603 | ||
604 | /* Send a DISC */ | |
605 | if (sk->sk_state == LLCP_CONNECTED) | |
58e3dd15 | 606 | nfc_llcp_send_disconnect(llcp_sock); |
d646960f SO |
607 | |
608 | if (sk->sk_state == LLCP_LISTEN) { | |
609 | struct nfc_llcp_sock *lsk, *n; | |
610 | struct sock *accept_sk; | |
611 | ||
612 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 613 | accept_queue) { |
d646960f SO |
614 | accept_sk = &lsk->sk; |
615 | lock_sock(accept_sk); | |
616 | ||
58e3dd15 | 617 | nfc_llcp_send_disconnect(lsk); |
d646960f SO |
618 | nfc_llcp_accept_unlink(accept_sk); |
619 | ||
620 | release_sock(accept_sk); | |
d646960f SO |
621 | } |
622 | } | |
623 | ||
cbbf4721 SO |
624 | if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) |
625 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
d646960f | 626 | |
d646960f SO |
627 | release_sock(sk); |
628 | ||
17f7ae16 TE |
629 | /* Keep this sock alive and therefore do not remove it from the sockets |
630 | * list until the DISC PDU has been actually sent. Otherwise we would | |
631 | * reply with DM PDUs before sending the DISC one. | |
632 | */ | |
633 | if (sk->sk_state == LLCP_DISCONNECTING) | |
634 | return err; | |
635 | ||
4463523b TE |
636 | if (sock->type == SOCK_RAW) |
637 | nfc_llcp_sock_unlink(&local->raw_sockets, sk); | |
638 | else | |
639 | nfc_llcp_sock_unlink(&local->sockets, sk); | |
a69f32af | 640 | |
40c75f81 | 641 | out: |
d646960f SO |
642 | sock_orphan(sk); |
643 | sock_put(sk); | |
644 | ||
40c75f81 | 645 | return err; |
d646960f SO |
646 | } |
647 | ||
648 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 649 | int len, int flags) |
d646960f SO |
650 | { |
651 | struct sock *sk = sock->sk; | |
652 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
653 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
654 | struct nfc_dev *dev; | |
655 | struct nfc_llcp_local *local; | |
656 | int ret = 0; | |
657 | ||
658 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
659 | ||
660 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
32418cfe | 661 | addr->sa_family != AF_NFC) |
d646960f | 662 | return -EINVAL; |
d646960f | 663 | |
32418cfe | 664 | if (addr->service_name_len == 0 && addr->dsap == 0) |
d646960f | 665 | return -EINVAL; |
d646960f SO |
666 | |
667 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 668 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
669 | |
670 | lock_sock(sk); | |
671 | ||
672 | if (sk->sk_state == LLCP_CONNECTED) { | |
673 | ret = -EISCONN; | |
674 | goto error; | |
675 | } | |
676 | ||
677 | dev = nfc_get_device(addr->dev_idx); | |
678 | if (dev == NULL) { | |
679 | ret = -ENODEV; | |
680 | goto error; | |
681 | } | |
682 | ||
683 | local = nfc_llcp_find_local(dev); | |
684 | if (local == NULL) { | |
685 | ret = -ENODEV; | |
686 | goto put_dev; | |
687 | } | |
688 | ||
689 | device_lock(&dev->dev); | |
690 | if (dev->dep_link_up == false) { | |
691 | ret = -ENOLINK; | |
692 | device_unlock(&dev->dev); | |
693 | goto put_dev; | |
694 | } | |
695 | device_unlock(&dev->dev); | |
696 | ||
697 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 698 | addr->target_idx != local->target_idx) { |
d646960f SO |
699 | ret = -ENOLINK; |
700 | goto put_dev; | |
701 | } | |
702 | ||
703 | llcp_sock->dev = dev; | |
c7aa1225 | 704 | llcp_sock->local = nfc_llcp_local_get(local); |
e4306bec | 705 | llcp_sock->remote_miu = llcp_sock->local->remote_miu; |
d646960f SO |
706 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
707 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
708 | ret = -ENOMEM; | |
709 | goto put_dev; | |
710 | } | |
cbbf4721 SO |
711 | |
712 | llcp_sock->reserved_ssap = llcp_sock->ssap; | |
713 | ||
d646960f SO |
714 | if (addr->service_name_len == 0) |
715 | llcp_sock->dsap = addr->dsap; | |
716 | else | |
717 | llcp_sock->dsap = LLCP_SAP_SDP; | |
718 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
719 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
720 | addr->service_name_len, |
721 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 722 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
723 | llcp_sock->service_name_len, |
724 | GFP_KERNEL); | |
d646960f | 725 | |
a69f32af | 726 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
727 | |
728 | ret = nfc_llcp_send_connect(llcp_sock); | |
729 | if (ret) | |
a69f32af | 730 | goto sock_unlink; |
d646960f | 731 | |
b4011239 SO |
732 | sk->sk_state = LLCP_CONNECTING; |
733 | ||
ff353d86 SO |
734 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
735 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
b4011239 | 736 | if (ret && ret != -EINPROGRESS) |
a69f32af | 737 | goto sock_unlink; |
d646960f SO |
738 | |
739 | release_sock(sk); | |
ff353d86 | 740 | |
b4011239 | 741 | return ret; |
d646960f | 742 | |
a69f32af SO |
743 | sock_unlink: |
744 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
745 | ||
746 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
747 | ||
d646960f SO |
748 | put_dev: |
749 | nfc_put_device(dev); | |
750 | ||
751 | error: | |
752 | release_sock(sk); | |
753 | return ret; | |
754 | } | |
755 | ||
53a0ac2e | 756 | static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock, |
427a2eb1 | 757 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
758 | { |
759 | struct sock *sk = sock->sk; | |
760 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
761 | int ret; | |
762 | ||
763 | pr_debug("sock %p sk %p", sock, sk); | |
764 | ||
765 | ret = sock_error(sk); | |
766 | if (ret) | |
767 | return ret; | |
768 | ||
769 | if (msg->msg_flags & MSG_OOB) | |
770 | return -EOPNOTSUPP; | |
771 | ||
772 | lock_sock(sk); | |
773 | ||
b874dec2 SO |
774 | if (sk->sk_type == SOCK_DGRAM) { |
775 | struct sockaddr_nfc_llcp *addr = | |
776 | (struct sockaddr_nfc_llcp *)msg->msg_name; | |
777 | ||
778 | if (msg->msg_namelen < sizeof(*addr)) { | |
779 | release_sock(sk); | |
b874dec2 SO |
780 | return -EINVAL; |
781 | } | |
782 | ||
783 | release_sock(sk); | |
784 | ||
785 | return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap, | |
786 | msg, len); | |
787 | } | |
788 | ||
53a0ac2e SO |
789 | if (sk->sk_state != LLCP_CONNECTED) { |
790 | release_sock(sk); | |
791 | return -ENOTCONN; | |
792 | } | |
793 | ||
794 | release_sock(sk); | |
795 | ||
796 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
797 | } | |
798 | ||
d646960f SO |
799 | static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock, |
800 | struct msghdr *msg, size_t len, int flags) | |
801 | { | |
802 | int noblock = flags & MSG_DONTWAIT; | |
803 | struct sock *sk = sock->sk; | |
804 | unsigned int copied, rlen; | |
805 | struct sk_buff *skb, *cskb; | |
806 | int err = 0; | |
807 | ||
808 | pr_debug("%p %zu\n", sk, len); | |
809 | ||
810 | lock_sock(sk); | |
811 | ||
812 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 813 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
814 | release_sock(sk); |
815 | return 0; | |
816 | } | |
817 | ||
818 | release_sock(sk); | |
819 | ||
820 | if (flags & (MSG_OOB)) | |
821 | return -EOPNOTSUPP; | |
822 | ||
823 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
824 | if (!skb) { | |
825 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 826 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
827 | |
828 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
829 | return 0; | |
830 | ||
831 | return err; | |
832 | } | |
833 | ||
427a2eb1 | 834 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
835 | copied = min_t(unsigned int, rlen, len); |
836 | ||
837 | cskb = skb; | |
fb97c3e8 | 838 | if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) { |
d646960f SO |
839 | if (!(flags & MSG_PEEK)) |
840 | skb_queue_head(&sk->sk_receive_queue, skb); | |
841 | return -EFAULT; | |
842 | } | |
843 | ||
2c2d45bd TE |
844 | sock_recv_timestamp(msg, sk, skb); |
845 | ||
31ca61a8 SO |
846 | if (sk->sk_type == SOCK_DGRAM && msg->msg_name) { |
847 | struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb); | |
fad2e371 SO |
848 | struct sockaddr_nfc_llcp *sockaddr = |
849 | (struct sockaddr_nfc_llcp *) msg->msg_name; | |
31ca61a8 | 850 | |
fad2e371 | 851 | msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp); |
31ca61a8 | 852 | |
fad2e371 | 853 | pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); |
31ca61a8 | 854 | |
d26d6504 | 855 | memset(sockaddr, 0, sizeof(*sockaddr)); |
fad2e371 SO |
856 | sockaddr->sa_family = AF_NFC; |
857 | sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; | |
858 | sockaddr->dsap = ui_cb->dsap; | |
859 | sockaddr->ssap = ui_cb->ssap; | |
31ca61a8 SO |
860 | } |
861 | ||
d646960f SO |
862 | /* Mark read part of skb as used */ |
863 | if (!(flags & MSG_PEEK)) { | |
864 | ||
865 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
31ca61a8 SO |
866 | if (sk->sk_type == SOCK_STREAM || |
867 | sk->sk_type == SOCK_DGRAM || | |
868 | sk->sk_type == SOCK_RAW) { | |
d646960f SO |
869 | skb_pull(skb, copied); |
870 | if (skb->len) { | |
871 | skb_queue_head(&sk->sk_receive_queue, skb); | |
872 | goto done; | |
873 | } | |
874 | } | |
875 | ||
876 | kfree_skb(skb); | |
877 | } | |
878 | ||
879 | /* XXX Queue backlogged skbs */ | |
880 | ||
881 | done: | |
882 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
883 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
884 | copied = rlen; | |
885 | ||
886 | return copied; | |
887 | } | |
888 | ||
889 | static const struct proto_ops llcp_sock_ops = { | |
890 | .family = PF_NFC, | |
891 | .owner = THIS_MODULE, | |
892 | .bind = llcp_sock_bind, | |
893 | .connect = llcp_sock_connect, | |
894 | .release = llcp_sock_release, | |
895 | .socketpair = sock_no_socketpair, | |
896 | .accept = llcp_sock_accept, | |
897 | .getname = llcp_sock_getname, | |
898 | .poll = llcp_sock_poll, | |
899 | .ioctl = sock_no_ioctl, | |
900 | .listen = llcp_sock_listen, | |
901 | .shutdown = sock_no_shutdown, | |
26fd76ca SO |
902 | .setsockopt = nfc_llcp_setsockopt, |
903 | .getsockopt = nfc_llcp_getsockopt, | |
53a0ac2e | 904 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
905 | .recvmsg = llcp_sock_recvmsg, |
906 | .mmap = sock_no_mmap, | |
907 | }; | |
908 | ||
4463523b TE |
909 | static const struct proto_ops llcp_rawsock_ops = { |
910 | .family = PF_NFC, | |
911 | .owner = THIS_MODULE, | |
912 | .bind = llcp_raw_sock_bind, | |
913 | .connect = sock_no_connect, | |
914 | .release = llcp_sock_release, | |
915 | .socketpair = sock_no_socketpair, | |
916 | .accept = sock_no_accept, | |
917 | .getname = llcp_sock_getname, | |
918 | .poll = llcp_sock_poll, | |
919 | .ioctl = sock_no_ioctl, | |
920 | .listen = sock_no_listen, | |
921 | .shutdown = sock_no_shutdown, | |
922 | .setsockopt = sock_no_setsockopt, | |
923 | .getsockopt = sock_no_getsockopt, | |
924 | .sendmsg = sock_no_sendmsg, | |
925 | .recvmsg = llcp_sock_recvmsg, | |
926 | .mmap = sock_no_mmap, | |
927 | }; | |
928 | ||
d646960f SO |
929 | static void llcp_sock_destruct(struct sock *sk) |
930 | { | |
931 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
932 | ||
933 | pr_debug("%p\n", sk); | |
934 | ||
935 | if (sk->sk_state == LLCP_CONNECTED) | |
936 | nfc_put_device(llcp_sock->dev); | |
937 | ||
938 | skb_queue_purge(&sk->sk_receive_queue); | |
939 | ||
940 | nfc_llcp_sock_free(llcp_sock); | |
941 | ||
942 | if (!sock_flag(sk, SOCK_DEAD)) { | |
943 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
944 | return; | |
945 | } | |
946 | } | |
947 | ||
948 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp) | |
949 | { | |
950 | struct sock *sk; | |
951 | struct nfc_llcp_sock *llcp_sock; | |
952 | ||
953 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto); | |
954 | if (!sk) | |
955 | return NULL; | |
956 | ||
957 | llcp_sock = nfc_llcp_sock(sk); | |
958 | ||
959 | sock_init_data(sock, sk); | |
960 | sk->sk_state = LLCP_CLOSED; | |
961 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
962 | sk->sk_type = type; | |
963 | sk->sk_destruct = llcp_sock_destruct; | |
964 | ||
965 | llcp_sock->ssap = 0; | |
966 | llcp_sock->dsap = LLCP_SAP_SDP; | |
06d44f80 | 967 | llcp_sock->rw = LLCP_MAX_RW + 1; |
5eef6669 | 968 | llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1); |
d646960f SO |
969 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; |
970 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
971 | llcp_sock->remote_ready = 1; | |
cbbf4721 | 972 | llcp_sock->reserved_ssap = LLCP_SAP_MAX; |
abd18d43 | 973 | nfc_llcp_socket_remote_param_init(llcp_sock); |
d646960f SO |
974 | skb_queue_head_init(&llcp_sock->tx_queue); |
975 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
d646960f SO |
976 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
977 | ||
978 | if (sock != NULL) | |
979 | sock->state = SS_UNCONNECTED; | |
980 | ||
981 | return sk; | |
982 | } | |
983 | ||
984 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
985 | { | |
986 | kfree(sock->service_name); | |
987 | ||
988 | skb_queue_purge(&sock->tx_queue); | |
989 | skb_queue_purge(&sock->tx_pending_queue); | |
d646960f SO |
990 | |
991 | list_del_init(&sock->accept_queue); | |
40c75f81 | 992 | |
d646960f | 993 | sock->parent = NULL; |
c7aa1225 SO |
994 | |
995 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
996 | } |
997 | ||
998 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
427a2eb1 | 999 | const struct nfc_protocol *nfc_proto) |
d646960f SO |
1000 | { |
1001 | struct sock *sk; | |
1002 | ||
1003 | pr_debug("%p\n", sock); | |
1004 | ||
4463523b TE |
1005 | if (sock->type != SOCK_STREAM && |
1006 | sock->type != SOCK_DGRAM && | |
1007 | sock->type != SOCK_RAW) | |
d646960f SO |
1008 | return -ESOCKTNOSUPPORT; |
1009 | ||
4463523b TE |
1010 | if (sock->type == SOCK_RAW) |
1011 | sock->ops = &llcp_rawsock_ops; | |
1012 | else | |
1013 | sock->ops = &llcp_sock_ops; | |
d646960f SO |
1014 | |
1015 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC); | |
1016 | if (sk == NULL) | |
1017 | return -ENOMEM; | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | static const struct nfc_protocol llcp_nfc_proto = { | |
1023 | .id = NFC_SOCKPROTO_LLCP, | |
1024 | .proto = &llcp_sock_proto, | |
1025 | .owner = THIS_MODULE, | |
1026 | .create = llcp_sock_create | |
1027 | }; | |
1028 | ||
1029 | int __init nfc_llcp_sock_init(void) | |
1030 | { | |
1031 | return nfc_proto_register(&llcp_nfc_proto); | |
1032 | } | |
1033 | ||
1034 | void nfc_llcp_sock_exit(void) | |
1035 | { | |
1036 | nfc_proto_unregister(&llcp_nfc_proto); | |
1037 | } |