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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 | |
98b32dec | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
d646960f SO |
16 | */ |
17 | ||
18 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ | |
19 | ||
20 | #include <linux/init.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/nfc.h> | |
24 | ||
30cc4587 | 25 | #include "nfc.h" |
d646960f SO |
26 | #include "llcp.h" |
27 | ||
ff353d86 SO |
28 | static int sock_wait_state(struct sock *sk, int state, unsigned long timeo) |
29 | { | |
30 | DECLARE_WAITQUEUE(wait, current); | |
31 | int err = 0; | |
32 | ||
33 | pr_debug("sk %p", sk); | |
34 | ||
35 | add_wait_queue(sk_sleep(sk), &wait); | |
36 | set_current_state(TASK_INTERRUPTIBLE); | |
37 | ||
38 | while (sk->sk_state != state) { | |
39 | if (!timeo) { | |
40 | err = -EINPROGRESS; | |
41 | break; | |
42 | } | |
43 | ||
44 | if (signal_pending(current)) { | |
45 | err = sock_intr_errno(timeo); | |
46 | break; | |
47 | } | |
48 | ||
49 | release_sock(sk); | |
50 | timeo = schedule_timeout(timeo); | |
51 | lock_sock(sk); | |
52 | set_current_state(TASK_INTERRUPTIBLE); | |
53 | ||
54 | err = sock_error(sk); | |
55 | if (err) | |
56 | break; | |
57 | } | |
58 | ||
59 | __set_current_state(TASK_RUNNING); | |
60 | remove_wait_queue(sk_sleep(sk), &wait); | |
61 | return err; | |
62 | } | |
63 | ||
d646960f SO |
64 | static struct proto llcp_sock_proto = { |
65 | .name = "NFC_LLCP", | |
66 | .owner = THIS_MODULE, | |
67 | .obj_size = sizeof(struct nfc_llcp_sock), | |
68 | }; | |
69 | ||
70 | static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) | |
71 | { | |
72 | struct sock *sk = sock->sk; | |
73 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
74 | struct nfc_llcp_local *local; | |
75 | struct nfc_dev *dev; | |
76 | struct sockaddr_nfc_llcp llcp_addr; | |
77 | int len, ret = 0; | |
78 | ||
d646960f SO |
79 | if (!addr || addr->sa_family != AF_NFC) |
80 | return -EINVAL; | |
81 | ||
c66433dc SO |
82 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); |
83 | ||
d646960f SO |
84 | memset(&llcp_addr, 0, sizeof(llcp_addr)); |
85 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
86 | memcpy(&llcp_addr, addr, len); | |
87 | ||
88 | /* This is going to be a listening socket, dsap must be 0 */ | |
89 | if (llcp_addr.dsap != 0) | |
90 | return -EINVAL; | |
91 | ||
92 | lock_sock(sk); | |
93 | ||
94 | if (sk->sk_state != LLCP_CLOSED) { | |
95 | ret = -EBADFD; | |
96 | goto error; | |
97 | } | |
98 | ||
99 | dev = nfc_get_device(llcp_addr.dev_idx); | |
100 | if (dev == NULL) { | |
101 | ret = -ENODEV; | |
102 | goto error; | |
103 | } | |
104 | ||
105 | local = nfc_llcp_find_local(dev); | |
106 | if (local == NULL) { | |
107 | ret = -ENODEV; | |
108 | goto put_dev; | |
109 | } | |
110 | ||
111 | llcp_sock->dev = dev; | |
c7aa1225 | 112 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
113 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; |
114 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
115 | llcp_addr.service_name_len, |
116 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 117 | llcp_sock->service_name = kmemdup(llcp_addr.service_name, |
427a2eb1 SO |
118 | llcp_sock->service_name_len, |
119 | GFP_KERNEL); | |
d646960f SO |
120 | |
121 | llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); | |
8b7e8eda SO |
122 | if (llcp_sock->ssap == LLCP_SAP_MAX) { |
123 | ret = -EADDRINUSE; | |
d646960f | 124 | goto put_dev; |
8b7e8eda | 125 | } |
d646960f | 126 | |
cbbf4721 SO |
127 | llcp_sock->reserved_ssap = llcp_sock->ssap; |
128 | ||
a69f32af | 129 | nfc_llcp_sock_link(&local->sockets, sk); |
d646960f SO |
130 | |
131 | pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); | |
132 | ||
133 | sk->sk_state = LLCP_BOUND; | |
134 | ||
135 | put_dev: | |
136 | nfc_put_device(dev); | |
137 | ||
138 | error: | |
139 | release_sock(sk); | |
140 | return ret; | |
141 | } | |
142 | ||
4463523b TE |
143 | static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr, |
144 | int alen) | |
145 | { | |
146 | struct sock *sk = sock->sk; | |
147 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
148 | struct nfc_llcp_local *local; | |
149 | struct nfc_dev *dev; | |
150 | struct sockaddr_nfc_llcp llcp_addr; | |
151 | int len, ret = 0; | |
152 | ||
153 | if (!addr || addr->sa_family != AF_NFC) | |
154 | return -EINVAL; | |
155 | ||
156 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
157 | ||
158 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
159 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
160 | memcpy(&llcp_addr, addr, len); | |
161 | ||
162 | lock_sock(sk); | |
163 | ||
164 | if (sk->sk_state != LLCP_CLOSED) { | |
165 | ret = -EBADFD; | |
166 | goto error; | |
167 | } | |
168 | ||
169 | dev = nfc_get_device(llcp_addr.dev_idx); | |
170 | if (dev == NULL) { | |
171 | ret = -ENODEV; | |
172 | goto error; | |
173 | } | |
174 | ||
175 | local = nfc_llcp_find_local(dev); | |
176 | if (local == NULL) { | |
177 | ret = -ENODEV; | |
178 | goto put_dev; | |
179 | } | |
180 | ||
181 | llcp_sock->dev = dev; | |
182 | llcp_sock->local = nfc_llcp_local_get(local); | |
183 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
184 | ||
185 | nfc_llcp_sock_link(&local->raw_sockets, sk); | |
186 | ||
187 | sk->sk_state = LLCP_BOUND; | |
188 | ||
189 | put_dev: | |
190 | nfc_put_device(dev); | |
191 | ||
192 | error: | |
193 | release_sock(sk); | |
194 | return ret; | |
195 | } | |
196 | ||
d646960f SO |
197 | static int llcp_sock_listen(struct socket *sock, int backlog) |
198 | { | |
199 | struct sock *sk = sock->sk; | |
200 | int ret = 0; | |
201 | ||
202 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
203 | ||
204 | lock_sock(sk); | |
205 | ||
874934f4 SJ |
206 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) || |
207 | sk->sk_state != LLCP_BOUND) { | |
d646960f SO |
208 | ret = -EBADFD; |
209 | goto error; | |
210 | } | |
211 | ||
212 | sk->sk_max_ack_backlog = backlog; | |
213 | sk->sk_ack_backlog = 0; | |
214 | ||
215 | pr_debug("Socket listening\n"); | |
216 | sk->sk_state = LLCP_LISTEN; | |
217 | ||
218 | error: | |
219 | release_sock(sk); | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
26fd76ca SO |
224 | static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname, |
225 | char __user *optval, unsigned int optlen) | |
226 | { | |
227 | struct sock *sk = sock->sk; | |
228 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
229 | u32 opt; | |
230 | int err = 0; | |
231 | ||
232 | pr_debug("%p optname %d\n", sk, optname); | |
233 | ||
234 | if (level != SOL_NFC) | |
235 | return -ENOPROTOOPT; | |
236 | ||
237 | lock_sock(sk); | |
238 | ||
239 | switch (optname) { | |
240 | case NFC_LLCP_RW: | |
241 | if (sk->sk_state == LLCP_CONNECTED || | |
242 | sk->sk_state == LLCP_BOUND || | |
243 | sk->sk_state == LLCP_LISTEN) { | |
244 | err = -EINVAL; | |
245 | break; | |
246 | } | |
247 | ||
248 | if (get_user(opt, (u32 __user *) optval)) { | |
249 | err = -EFAULT; | |
250 | break; | |
251 | } | |
252 | ||
253 | if (opt > LLCP_MAX_RW) { | |
254 | err = -EINVAL; | |
255 | break; | |
256 | } | |
257 | ||
258 | llcp_sock->rw = (u8) opt; | |
259 | ||
260 | break; | |
261 | ||
262 | case NFC_LLCP_MIUX: | |
263 | if (sk->sk_state == LLCP_CONNECTED || | |
264 | sk->sk_state == LLCP_BOUND || | |
265 | sk->sk_state == LLCP_LISTEN) { | |
266 | err = -EINVAL; | |
267 | break; | |
268 | } | |
269 | ||
270 | if (get_user(opt, (u32 __user *) optval)) { | |
271 | err = -EFAULT; | |
272 | break; | |
273 | } | |
274 | ||
275 | if (opt > LLCP_MAX_MIUX) { | |
276 | err = -EINVAL; | |
277 | break; | |
278 | } | |
279 | ||
5eef6669 | 280 | llcp_sock->miux = cpu_to_be16((u16) opt); |
26fd76ca SO |
281 | |
282 | break; | |
283 | ||
284 | default: | |
285 | err = -ENOPROTOOPT; | |
286 | break; | |
287 | } | |
288 | ||
289 | release_sock(sk); | |
290 | ||
06d44f80 SO |
291 | pr_debug("%p rw %d miux %d\n", llcp_sock, |
292 | llcp_sock->rw, llcp_sock->miux); | |
293 | ||
26fd76ca SO |
294 | return err; |
295 | } | |
296 | ||
297 | static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname, | |
298 | char __user *optval, int __user *optlen) | |
299 | { | |
00e856db | 300 | struct nfc_llcp_local *local; |
26fd76ca SO |
301 | struct sock *sk = sock->sk; |
302 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
303 | int len, err = 0; | |
064f370c | 304 | u16 miux, remote_miu; |
00e856db | 305 | u8 rw; |
26fd76ca SO |
306 | |
307 | pr_debug("%p optname %d\n", sk, optname); | |
308 | ||
309 | if (level != SOL_NFC) | |
310 | return -ENOPROTOOPT; | |
311 | ||
312 | if (get_user(len, optlen)) | |
313 | return -EFAULT; | |
314 | ||
00e856db SO |
315 | local = llcp_sock->local; |
316 | if (!local) | |
317 | return -ENODEV; | |
318 | ||
26fd76ca SO |
319 | len = min_t(u32, len, sizeof(u32)); |
320 | ||
321 | lock_sock(sk); | |
322 | ||
323 | switch (optname) { | |
324 | case NFC_LLCP_RW: | |
00e856db SO |
325 | rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw; |
326 | if (put_user(rw, (u32 __user *) optval)) | |
26fd76ca SO |
327 | err = -EFAULT; |
328 | ||
329 | break; | |
330 | ||
331 | case NFC_LLCP_MIUX: | |
00e856db SO |
332 | miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ? |
333 | be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux); | |
334 | ||
335 | if (put_user(miux, (u32 __user *) optval)) | |
26fd76ca SO |
336 | err = -EFAULT; |
337 | ||
338 | break; | |
339 | ||
064f370c TE |
340 | case NFC_LLCP_REMOTE_MIU: |
341 | remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ? | |
342 | local->remote_miu : llcp_sock->remote_miu; | |
343 | ||
344 | if (put_user(remote_miu, (u32 __user *) optval)) | |
345 | err = -EFAULT; | |
346 | ||
347 | break; | |
348 | ||
349 | case NFC_LLCP_REMOTE_LTO: | |
350 | if (put_user(local->remote_lto / 10, (u32 __user *) optval)) | |
351 | err = -EFAULT; | |
352 | ||
353 | break; | |
354 | ||
355 | case NFC_LLCP_REMOTE_RW: | |
356 | if (put_user(llcp_sock->remote_rw, (u32 __user *) optval)) | |
26fd76ca SO |
357 | err = -EFAULT; |
358 | ||
359 | break; | |
360 | ||
361 | default: | |
362 | err = -ENOPROTOOPT; | |
363 | break; | |
364 | } | |
365 | ||
366 | release_sock(sk); | |
367 | ||
368 | if (put_user(len, optlen)) | |
369 | return -EFAULT; | |
370 | ||
371 | return err; | |
372 | } | |
373 | ||
d646960f SO |
374 | void nfc_llcp_accept_unlink(struct sock *sk) |
375 | { | |
376 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
377 | ||
378 | pr_debug("state %d\n", sk->sk_state); | |
379 | ||
380 | list_del_init(&llcp_sock->accept_queue); | |
381 | sk_acceptq_removed(llcp_sock->parent); | |
382 | llcp_sock->parent = NULL; | |
383 | ||
384 | sock_put(sk); | |
385 | } | |
386 | ||
387 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
388 | { | |
389 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
390 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
391 | ||
392 | /* Lock will be free from unlink */ | |
393 | sock_hold(sk); | |
394 | ||
395 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 396 | &llcp_sock_parent->accept_queue); |
d646960f SO |
397 | llcp_sock->parent = parent; |
398 | sk_acceptq_added(parent); | |
399 | } | |
400 | ||
401 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 402 | struct socket *newsock) |
d646960f SO |
403 | { |
404 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
405 | struct sock *sk; | |
406 | ||
407 | llcp_parent = nfc_llcp_sock(parent); | |
408 | ||
409 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 410 | accept_queue) { |
d646960f SO |
411 | sk = &lsk->sk; |
412 | lock_sock(sk); | |
413 | ||
414 | if (sk->sk_state == LLCP_CLOSED) { | |
415 | release_sock(sk); | |
416 | nfc_llcp_accept_unlink(sk); | |
417 | continue; | |
418 | } | |
419 | ||
420 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
39a352a5 SO |
421 | list_del_init(&lsk->accept_queue); |
422 | sock_put(sk); | |
423 | ||
d646960f SO |
424 | if (newsock) |
425 | sock_graft(sk, newsock); | |
426 | ||
427 | release_sock(sk); | |
428 | ||
429 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
430 | ||
b141e811 SO |
431 | sk_acceptq_removed(parent); |
432 | ||
d646960f SO |
433 | return sk; |
434 | } | |
435 | ||
436 | release_sock(sk); | |
437 | } | |
438 | ||
439 | return NULL; | |
440 | } | |
441 | ||
442 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
427a2eb1 | 443 | int flags) |
d646960f SO |
444 | { |
445 | DECLARE_WAITQUEUE(wait, current); | |
446 | struct sock *sk = sock->sk, *new_sk; | |
447 | long timeo; | |
448 | int ret = 0; | |
449 | ||
450 | pr_debug("parent %p\n", sk); | |
451 | ||
452 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
453 | ||
454 | if (sk->sk_state != LLCP_LISTEN) { | |
455 | ret = -EBADFD; | |
456 | goto error; | |
457 | } | |
458 | ||
459 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
460 | ||
461 | /* Wait for an incoming connection. */ | |
462 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
463 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
464 | set_current_state(TASK_INTERRUPTIBLE); | |
465 | ||
466 | if (!timeo) { | |
467 | ret = -EAGAIN; | |
468 | break; | |
469 | } | |
470 | ||
471 | if (signal_pending(current)) { | |
472 | ret = sock_intr_errno(timeo); | |
473 | break; | |
474 | } | |
475 | ||
476 | release_sock(sk); | |
477 | timeo = schedule_timeout(timeo); | |
478 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
479 | } | |
480 | __set_current_state(TASK_RUNNING); | |
481 | remove_wait_queue(sk_sleep(sk), &wait); | |
482 | ||
483 | if (ret) | |
484 | goto error; | |
485 | ||
486 | newsock->state = SS_CONNECTED; | |
487 | ||
488 | pr_debug("new socket %p\n", new_sk); | |
489 | ||
490 | error: | |
491 | release_sock(sk); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
12e5bdfe | 496 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, |
d646960f SO |
497 | int *len, int peer) |
498 | { | |
d646960f SO |
499 | struct sock *sk = sock->sk; |
500 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
12e5bdfe | 501 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); |
d646960f | 502 | |
fe3c094a SO |
503 | if (llcp_sock == NULL || llcp_sock->dev == NULL) |
504 | return -EBADFD; | |
505 | ||
12e5bdfe SO |
506 | pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, |
507 | llcp_sock->dsap, llcp_sock->ssap); | |
d646960f | 508 | |
5ffedc6e | 509 | memset(llcp_addr, 0, sizeof(*llcp_addr)); |
d646960f SO |
510 | *len = sizeof(struct sockaddr_nfc_llcp); |
511 | ||
5ffedc6e | 512 | llcp_addr->sa_family = AF_NFC; |
d646960f | 513 | llcp_addr->dev_idx = llcp_sock->dev->idx; |
12e5bdfe | 514 | llcp_addr->target_idx = llcp_sock->target_idx; |
5ffedc6e | 515 | llcp_addr->nfc_protocol = llcp_sock->nfc_protocol; |
d646960f SO |
516 | llcp_addr->dsap = llcp_sock->dsap; |
517 | llcp_addr->ssap = llcp_sock->ssap; | |
518 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
519 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 520 | llcp_addr->service_name_len); |
d646960f SO |
521 | |
522 | return 0; | |
523 | } | |
524 | ||
525 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
526 | { | |
413df10b | 527 | struct nfc_llcp_sock *llcp_sock, *parent_sock; |
d646960f SO |
528 | struct sock *sk; |
529 | ||
530 | parent_sock = nfc_llcp_sock(parent); | |
531 | ||
413df10b AL |
532 | list_for_each_entry(llcp_sock, &parent_sock->accept_queue, |
533 | accept_queue) { | |
d646960f SO |
534 | sk = &llcp_sock->sk; |
535 | ||
536 | if (sk->sk_state == LLCP_CONNECTED) | |
537 | return POLLIN | POLLRDNORM; | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 544 | poll_table *wait) |
d646960f SO |
545 | { |
546 | struct sock *sk = sock->sk; | |
547 | unsigned int mask = 0; | |
548 | ||
549 | pr_debug("%p\n", sk); | |
550 | ||
551 | sock_poll_wait(file, sk_sleep(sk), wait); | |
552 | ||
553 | if (sk->sk_state == LLCP_LISTEN) | |
554 | return llcp_accept_poll(sk); | |
555 | ||
556 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
7d4c04fc | 557 | mask |= POLLERR | |
8facd5fb | 558 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
d646960f SO |
559 | |
560 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
4260c13b | 561 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
562 | |
563 | if (sk->sk_state == LLCP_CLOSED) | |
564 | mask |= POLLHUP; | |
565 | ||
4260c13b SO |
566 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
567 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
568 | ||
569 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
570 | mask |= POLLHUP; | |
571 | ||
b4011239 | 572 | if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED) |
4260c13b SO |
573 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
574 | else | |
9cd3e072 | 575 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
4260c13b SO |
576 | |
577 | pr_debug("mask 0x%x\n", mask); | |
578 | ||
d646960f SO |
579 | return mask; |
580 | } | |
581 | ||
582 | static int llcp_sock_release(struct socket *sock) | |
583 | { | |
584 | struct sock *sk = sock->sk; | |
585 | struct nfc_llcp_local *local; | |
586 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 587 | int err = 0; |
d646960f SO |
588 | |
589 | if (!sk) | |
590 | return 0; | |
591 | ||
592 | pr_debug("%p\n", sk); | |
593 | ||
594 | local = llcp_sock->local; | |
40c75f81 SO |
595 | if (local == NULL) { |
596 | err = -ENODEV; | |
597 | goto out; | |
598 | } | |
d646960f | 599 | |
d646960f SO |
600 | lock_sock(sk); |
601 | ||
602 | /* Send a DISC */ | |
603 | if (sk->sk_state == LLCP_CONNECTED) | |
58e3dd15 | 604 | nfc_llcp_send_disconnect(llcp_sock); |
d646960f SO |
605 | |
606 | if (sk->sk_state == LLCP_LISTEN) { | |
607 | struct nfc_llcp_sock *lsk, *n; | |
608 | struct sock *accept_sk; | |
609 | ||
610 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 611 | accept_queue) { |
d646960f SO |
612 | accept_sk = &lsk->sk; |
613 | lock_sock(accept_sk); | |
614 | ||
58e3dd15 | 615 | nfc_llcp_send_disconnect(lsk); |
d646960f SO |
616 | nfc_llcp_accept_unlink(accept_sk); |
617 | ||
618 | release_sock(accept_sk); | |
d646960f SO |
619 | } |
620 | } | |
621 | ||
cbbf4721 SO |
622 | if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) |
623 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
d646960f | 624 | |
d646960f SO |
625 | release_sock(sk); |
626 | ||
17f7ae16 TE |
627 | /* Keep this sock alive and therefore do not remove it from the sockets |
628 | * list until the DISC PDU has been actually sent. Otherwise we would | |
629 | * reply with DM PDUs before sending the DISC one. | |
630 | */ | |
631 | if (sk->sk_state == LLCP_DISCONNECTING) | |
632 | return err; | |
633 | ||
4463523b TE |
634 | if (sock->type == SOCK_RAW) |
635 | nfc_llcp_sock_unlink(&local->raw_sockets, sk); | |
636 | else | |
637 | nfc_llcp_sock_unlink(&local->sockets, sk); | |
a69f32af | 638 | |
40c75f81 | 639 | out: |
d646960f SO |
640 | sock_orphan(sk); |
641 | sock_put(sk); | |
642 | ||
40c75f81 | 643 | return err; |
d646960f SO |
644 | } |
645 | ||
646 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 647 | int len, int flags) |
d646960f SO |
648 | { |
649 | struct sock *sk = sock->sk; | |
650 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
651 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
652 | struct nfc_dev *dev; | |
653 | struct nfc_llcp_local *local; | |
654 | int ret = 0; | |
655 | ||
656 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
657 | ||
658 | if (!addr || len < sizeof(struct sockaddr_nfc) || | |
32418cfe | 659 | addr->sa_family != AF_NFC) |
d646960f | 660 | return -EINVAL; |
d646960f | 661 | |
32418cfe | 662 | if (addr->service_name_len == 0 && addr->dsap == 0) |
d646960f | 663 | return -EINVAL; |
d646960f SO |
664 | |
665 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 666 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
667 | |
668 | lock_sock(sk); | |
669 | ||
670 | if (sk->sk_state == LLCP_CONNECTED) { | |
671 | ret = -EISCONN; | |
672 | goto error; | |
673 | } | |
674 | ||
675 | dev = nfc_get_device(addr->dev_idx); | |
676 | if (dev == NULL) { | |
677 | ret = -ENODEV; | |
678 | goto error; | |
679 | } | |
680 | ||
681 | local = nfc_llcp_find_local(dev); | |
682 | if (local == NULL) { | |
683 | ret = -ENODEV; | |
684 | goto put_dev; | |
685 | } | |
686 | ||
687 | device_lock(&dev->dev); | |
688 | if (dev->dep_link_up == false) { | |
689 | ret = -ENOLINK; | |
690 | device_unlock(&dev->dev); | |
691 | goto put_dev; | |
692 | } | |
693 | device_unlock(&dev->dev); | |
694 | ||
695 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 696 | addr->target_idx != local->target_idx) { |
d646960f SO |
697 | ret = -ENOLINK; |
698 | goto put_dev; | |
699 | } | |
700 | ||
701 | llcp_sock->dev = dev; | |
c7aa1225 | 702 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
703 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
704 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
705 | ret = -ENOMEM; | |
706 | goto put_dev; | |
707 | } | |
cbbf4721 SO |
708 | |
709 | llcp_sock->reserved_ssap = llcp_sock->ssap; | |
710 | ||
d646960f SO |
711 | if (addr->service_name_len == 0) |
712 | llcp_sock->dsap = addr->dsap; | |
713 | else | |
714 | llcp_sock->dsap = LLCP_SAP_SDP; | |
715 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
716 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
717 | addr->service_name_len, |
718 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 719 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
720 | llcp_sock->service_name_len, |
721 | GFP_KERNEL); | |
d646960f | 722 | |
a69f32af | 723 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
724 | |
725 | ret = nfc_llcp_send_connect(llcp_sock); | |
726 | if (ret) | |
a69f32af | 727 | goto sock_unlink; |
d646960f | 728 | |
b4011239 SO |
729 | sk->sk_state = LLCP_CONNECTING; |
730 | ||
ff353d86 SO |
731 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
732 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
b4011239 | 733 | if (ret && ret != -EINPROGRESS) |
a69f32af | 734 | goto sock_unlink; |
d646960f SO |
735 | |
736 | release_sock(sk); | |
ff353d86 | 737 | |
b4011239 | 738 | return ret; |
d646960f | 739 | |
a69f32af SO |
740 | sock_unlink: |
741 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
742 | ||
743 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
744 | ||
d646960f SO |
745 | put_dev: |
746 | nfc_put_device(dev); | |
747 | ||
748 | error: | |
749 | release_sock(sk); | |
750 | return ret; | |
751 | } | |
752 | ||
1b784140 YX |
753 | static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
754 | size_t len) | |
53a0ac2e SO |
755 | { |
756 | struct sock *sk = sock->sk; | |
757 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
758 | int ret; | |
759 | ||
760 | pr_debug("sock %p sk %p", sock, sk); | |
761 | ||
762 | ret = sock_error(sk); | |
763 | if (ret) | |
764 | return ret; | |
765 | ||
766 | if (msg->msg_flags & MSG_OOB) | |
767 | return -EOPNOTSUPP; | |
768 | ||
769 | lock_sock(sk); | |
770 | ||
b874dec2 | 771 | if (sk->sk_type == SOCK_DGRAM) { |
342dfc30 SH |
772 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr, |
773 | msg->msg_name); | |
b874dec2 SO |
774 | |
775 | if (msg->msg_namelen < sizeof(*addr)) { | |
776 | release_sock(sk); | |
b874dec2 SO |
777 | return -EINVAL; |
778 | } | |
779 | ||
780 | release_sock(sk); | |
781 | ||
782 | return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap, | |
783 | msg, len); | |
784 | } | |
785 | ||
53a0ac2e SO |
786 | if (sk->sk_state != LLCP_CONNECTED) { |
787 | release_sock(sk); | |
788 | return -ENOTCONN; | |
789 | } | |
790 | ||
791 | release_sock(sk); | |
792 | ||
793 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
794 | } | |
795 | ||
1b784140 YX |
796 | static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
797 | size_t len, int flags) | |
d646960f SO |
798 | { |
799 | int noblock = flags & MSG_DONTWAIT; | |
800 | struct sock *sk = sock->sk; | |
801 | unsigned int copied, rlen; | |
802 | struct sk_buff *skb, *cskb; | |
803 | int err = 0; | |
804 | ||
805 | pr_debug("%p %zu\n", sk, len); | |
806 | ||
807 | lock_sock(sk); | |
808 | ||
809 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 810 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
811 | release_sock(sk); |
812 | return 0; | |
813 | } | |
814 | ||
815 | release_sock(sk); | |
816 | ||
817 | if (flags & (MSG_OOB)) | |
818 | return -EOPNOTSUPP; | |
819 | ||
820 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
821 | if (!skb) { | |
822 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 823 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
824 | |
825 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
826 | return 0; | |
827 | ||
828 | return err; | |
829 | } | |
830 | ||
427a2eb1 | 831 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
832 | copied = min_t(unsigned int, rlen, len); |
833 | ||
834 | cskb = skb; | |
51f3d02b | 835 | if (skb_copy_datagram_msg(cskb, 0, msg, copied)) { |
d646960f SO |
836 | if (!(flags & MSG_PEEK)) |
837 | skb_queue_head(&sk->sk_receive_queue, skb); | |
838 | return -EFAULT; | |
839 | } | |
840 | ||
2c2d45bd TE |
841 | sock_recv_timestamp(msg, sk, skb); |
842 | ||
31ca61a8 SO |
843 | if (sk->sk_type == SOCK_DGRAM && msg->msg_name) { |
844 | struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb); | |
342dfc30 SH |
845 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr, |
846 | msg->msg_name); | |
31ca61a8 | 847 | |
fad2e371 | 848 | msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp); |
31ca61a8 | 849 | |
fad2e371 | 850 | pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); |
31ca61a8 | 851 | |
d26d6504 | 852 | memset(sockaddr, 0, sizeof(*sockaddr)); |
fad2e371 SO |
853 | sockaddr->sa_family = AF_NFC; |
854 | sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; | |
855 | sockaddr->dsap = ui_cb->dsap; | |
856 | sockaddr->ssap = ui_cb->ssap; | |
31ca61a8 SO |
857 | } |
858 | ||
d646960f SO |
859 | /* Mark read part of skb as used */ |
860 | if (!(flags & MSG_PEEK)) { | |
861 | ||
862 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
31ca61a8 SO |
863 | if (sk->sk_type == SOCK_STREAM || |
864 | sk->sk_type == SOCK_DGRAM || | |
865 | sk->sk_type == SOCK_RAW) { | |
d646960f SO |
866 | skb_pull(skb, copied); |
867 | if (skb->len) { | |
868 | skb_queue_head(&sk->sk_receive_queue, skb); | |
869 | goto done; | |
870 | } | |
871 | } | |
872 | ||
873 | kfree_skb(skb); | |
874 | } | |
875 | ||
876 | /* XXX Queue backlogged skbs */ | |
877 | ||
878 | done: | |
879 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
880 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
881 | copied = rlen; | |
882 | ||
883 | return copied; | |
884 | } | |
885 | ||
886 | static const struct proto_ops llcp_sock_ops = { | |
887 | .family = PF_NFC, | |
888 | .owner = THIS_MODULE, | |
889 | .bind = llcp_sock_bind, | |
890 | .connect = llcp_sock_connect, | |
891 | .release = llcp_sock_release, | |
892 | .socketpair = sock_no_socketpair, | |
893 | .accept = llcp_sock_accept, | |
894 | .getname = llcp_sock_getname, | |
895 | .poll = llcp_sock_poll, | |
896 | .ioctl = sock_no_ioctl, | |
897 | .listen = llcp_sock_listen, | |
898 | .shutdown = sock_no_shutdown, | |
26fd76ca SO |
899 | .setsockopt = nfc_llcp_setsockopt, |
900 | .getsockopt = nfc_llcp_getsockopt, | |
53a0ac2e | 901 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
902 | .recvmsg = llcp_sock_recvmsg, |
903 | .mmap = sock_no_mmap, | |
904 | }; | |
905 | ||
4463523b TE |
906 | static const struct proto_ops llcp_rawsock_ops = { |
907 | .family = PF_NFC, | |
908 | .owner = THIS_MODULE, | |
909 | .bind = llcp_raw_sock_bind, | |
910 | .connect = sock_no_connect, | |
911 | .release = llcp_sock_release, | |
912 | .socketpair = sock_no_socketpair, | |
913 | .accept = sock_no_accept, | |
914 | .getname = llcp_sock_getname, | |
915 | .poll = llcp_sock_poll, | |
916 | .ioctl = sock_no_ioctl, | |
917 | .listen = sock_no_listen, | |
918 | .shutdown = sock_no_shutdown, | |
919 | .setsockopt = sock_no_setsockopt, | |
920 | .getsockopt = sock_no_getsockopt, | |
921 | .sendmsg = sock_no_sendmsg, | |
922 | .recvmsg = llcp_sock_recvmsg, | |
923 | .mmap = sock_no_mmap, | |
924 | }; | |
925 | ||
d646960f SO |
926 | static void llcp_sock_destruct(struct sock *sk) |
927 | { | |
928 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
929 | ||
930 | pr_debug("%p\n", sk); | |
931 | ||
932 | if (sk->sk_state == LLCP_CONNECTED) | |
933 | nfc_put_device(llcp_sock->dev); | |
934 | ||
935 | skb_queue_purge(&sk->sk_receive_queue); | |
936 | ||
937 | nfc_llcp_sock_free(llcp_sock); | |
938 | ||
939 | if (!sock_flag(sk, SOCK_DEAD)) { | |
940 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
941 | return; | |
942 | } | |
943 | } | |
944 | ||
11aa9c28 | 945 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern) |
d646960f SO |
946 | { |
947 | struct sock *sk; | |
948 | struct nfc_llcp_sock *llcp_sock; | |
949 | ||
11aa9c28 | 950 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern); |
d646960f SO |
951 | if (!sk) |
952 | return NULL; | |
953 | ||
954 | llcp_sock = nfc_llcp_sock(sk); | |
955 | ||
956 | sock_init_data(sock, sk); | |
957 | sk->sk_state = LLCP_CLOSED; | |
958 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
959 | sk->sk_type = type; | |
960 | sk->sk_destruct = llcp_sock_destruct; | |
961 | ||
962 | llcp_sock->ssap = 0; | |
963 | llcp_sock->dsap = LLCP_SAP_SDP; | |
06d44f80 | 964 | llcp_sock->rw = LLCP_MAX_RW + 1; |
5eef6669 | 965 | llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1); |
d646960f SO |
966 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; |
967 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
968 | llcp_sock->remote_ready = 1; | |
cbbf4721 | 969 | llcp_sock->reserved_ssap = LLCP_SAP_MAX; |
abd18d43 | 970 | nfc_llcp_socket_remote_param_init(llcp_sock); |
d646960f SO |
971 | skb_queue_head_init(&llcp_sock->tx_queue); |
972 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
d646960f SO |
973 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
974 | ||
975 | if (sock != NULL) | |
976 | sock->state = SS_UNCONNECTED; | |
977 | ||
978 | return sk; | |
979 | } | |
980 | ||
981 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
982 | { | |
983 | kfree(sock->service_name); | |
984 | ||
985 | skb_queue_purge(&sock->tx_queue); | |
986 | skb_queue_purge(&sock->tx_pending_queue); | |
d646960f SO |
987 | |
988 | list_del_init(&sock->accept_queue); | |
40c75f81 | 989 | |
d646960f | 990 | sock->parent = NULL; |
c7aa1225 SO |
991 | |
992 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
993 | } |
994 | ||
995 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
11aa9c28 | 996 | const struct nfc_protocol *nfc_proto, int kern) |
d646960f SO |
997 | { |
998 | struct sock *sk; | |
999 | ||
1000 | pr_debug("%p\n", sock); | |
1001 | ||
4463523b TE |
1002 | if (sock->type != SOCK_STREAM && |
1003 | sock->type != SOCK_DGRAM && | |
1004 | sock->type != SOCK_RAW) | |
d646960f SO |
1005 | return -ESOCKTNOSUPPORT; |
1006 | ||
4463523b TE |
1007 | if (sock->type == SOCK_RAW) |
1008 | sock->ops = &llcp_rawsock_ops; | |
1009 | else | |
1010 | sock->ops = &llcp_sock_ops; | |
d646960f | 1011 | |
11aa9c28 | 1012 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern); |
d646960f SO |
1013 | if (sk == NULL) |
1014 | return -ENOMEM; | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
1019 | static const struct nfc_protocol llcp_nfc_proto = { | |
1020 | .id = NFC_SOCKPROTO_LLCP, | |
1021 | .proto = &llcp_sock_proto, | |
1022 | .owner = THIS_MODULE, | |
1023 | .create = llcp_sock_create | |
1024 | }; | |
1025 | ||
1026 | int __init nfc_llcp_sock_init(void) | |
1027 | { | |
1028 | return nfc_proto_register(&llcp_nfc_proto); | |
1029 | } | |
1030 | ||
1031 | void nfc_llcp_sock_exit(void) | |
1032 | { | |
1033 | nfc_proto_unregister(&llcp_nfc_proto); | |
1034 | } |