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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> | |
174cd4b1 | 24 | #include <linux/sched/signal.h> |
d646960f | 25 | |
30cc4587 | 26 | #include "nfc.h" |
d646960f SO |
27 | #include "llcp.h" |
28 | ||
ff353d86 SO |
29 | static int sock_wait_state(struct sock *sk, int state, unsigned long timeo) |
30 | { | |
31 | DECLARE_WAITQUEUE(wait, current); | |
32 | int err = 0; | |
33 | ||
34 | pr_debug("sk %p", sk); | |
35 | ||
36 | add_wait_queue(sk_sleep(sk), &wait); | |
37 | set_current_state(TASK_INTERRUPTIBLE); | |
38 | ||
39 | while (sk->sk_state != state) { | |
40 | if (!timeo) { | |
41 | err = -EINPROGRESS; | |
42 | break; | |
43 | } | |
44 | ||
45 | if (signal_pending(current)) { | |
46 | err = sock_intr_errno(timeo); | |
47 | break; | |
48 | } | |
49 | ||
50 | release_sock(sk); | |
51 | timeo = schedule_timeout(timeo); | |
52 | lock_sock(sk); | |
53 | set_current_state(TASK_INTERRUPTIBLE); | |
54 | ||
55 | err = sock_error(sk); | |
56 | if (err) | |
57 | break; | |
58 | } | |
59 | ||
60 | __set_current_state(TASK_RUNNING); | |
61 | remove_wait_queue(sk_sleep(sk), &wait); | |
62 | return err; | |
63 | } | |
64 | ||
d646960f SO |
65 | static struct proto llcp_sock_proto = { |
66 | .name = "NFC_LLCP", | |
67 | .owner = THIS_MODULE, | |
68 | .obj_size = sizeof(struct nfc_llcp_sock), | |
69 | }; | |
70 | ||
71 | static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen) | |
72 | { | |
73 | struct sock *sk = sock->sk; | |
74 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
75 | struct nfc_llcp_local *local; | |
76 | struct nfc_dev *dev; | |
77 | struct sockaddr_nfc_llcp llcp_addr; | |
78 | int len, ret = 0; | |
79 | ||
f6a5885f MJ |
80 | if (!addr || alen < offsetofend(struct sockaddr, sa_family) || |
81 | addr->sa_family != AF_NFC) | |
d646960f SO |
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); | |
e7ad2173 ED |
122 | if (!llcp_sock->service_name) { |
123 | ret = -ENOMEM; | |
124 | goto put_dev; | |
125 | } | |
d646960f | 126 | llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock); |
8b7e8eda | 127 | if (llcp_sock->ssap == LLCP_SAP_MAX) { |
e7ad2173 ED |
128 | kfree(llcp_sock->service_name); |
129 | llcp_sock->service_name = NULL; | |
8b7e8eda | 130 | ret = -EADDRINUSE; |
d646960f | 131 | goto put_dev; |
8b7e8eda | 132 | } |
d646960f | 133 | |
cbbf4721 SO |
134 | llcp_sock->reserved_ssap = llcp_sock->ssap; |
135 | ||
a69f32af | 136 | nfc_llcp_sock_link(&local->sockets, sk); |
d646960f SO |
137 | |
138 | pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap); | |
139 | ||
140 | sk->sk_state = LLCP_BOUND; | |
141 | ||
142 | put_dev: | |
143 | nfc_put_device(dev); | |
144 | ||
145 | error: | |
146 | release_sock(sk); | |
147 | return ret; | |
148 | } | |
149 | ||
4463523b TE |
150 | static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr, |
151 | int alen) | |
152 | { | |
153 | struct sock *sk = sock->sk; | |
154 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
155 | struct nfc_llcp_local *local; | |
156 | struct nfc_dev *dev; | |
157 | struct sockaddr_nfc_llcp llcp_addr; | |
158 | int len, ret = 0; | |
159 | ||
f6a5885f MJ |
160 | if (!addr || alen < offsetofend(struct sockaddr, sa_family) || |
161 | addr->sa_family != AF_NFC) | |
4463523b TE |
162 | return -EINVAL; |
163 | ||
164 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
165 | ||
166 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
167 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
168 | memcpy(&llcp_addr, addr, len); | |
169 | ||
170 | lock_sock(sk); | |
171 | ||
172 | if (sk->sk_state != LLCP_CLOSED) { | |
173 | ret = -EBADFD; | |
174 | goto error; | |
175 | } | |
176 | ||
177 | dev = nfc_get_device(llcp_addr.dev_idx); | |
178 | if (dev == NULL) { | |
179 | ret = -ENODEV; | |
180 | goto error; | |
181 | } | |
182 | ||
183 | local = nfc_llcp_find_local(dev); | |
184 | if (local == NULL) { | |
185 | ret = -ENODEV; | |
186 | goto put_dev; | |
187 | } | |
188 | ||
189 | llcp_sock->dev = dev; | |
190 | llcp_sock->local = nfc_llcp_local_get(local); | |
191 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
192 | ||
193 | nfc_llcp_sock_link(&local->raw_sockets, sk); | |
194 | ||
195 | sk->sk_state = LLCP_BOUND; | |
196 | ||
197 | put_dev: | |
198 | nfc_put_device(dev); | |
199 | ||
200 | error: | |
201 | release_sock(sk); | |
202 | return ret; | |
203 | } | |
204 | ||
d646960f SO |
205 | static int llcp_sock_listen(struct socket *sock, int backlog) |
206 | { | |
207 | struct sock *sk = sock->sk; | |
208 | int ret = 0; | |
209 | ||
210 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
211 | ||
212 | lock_sock(sk); | |
213 | ||
874934f4 SJ |
214 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) || |
215 | sk->sk_state != LLCP_BOUND) { | |
d646960f SO |
216 | ret = -EBADFD; |
217 | goto error; | |
218 | } | |
219 | ||
220 | sk->sk_max_ack_backlog = backlog; | |
221 | sk->sk_ack_backlog = 0; | |
222 | ||
223 | pr_debug("Socket listening\n"); | |
224 | sk->sk_state = LLCP_LISTEN; | |
225 | ||
226 | error: | |
227 | release_sock(sk); | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
26fd76ca SO |
232 | static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname, |
233 | char __user *optval, unsigned int optlen) | |
234 | { | |
235 | struct sock *sk = sock->sk; | |
236 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
237 | u32 opt; | |
238 | int err = 0; | |
239 | ||
240 | pr_debug("%p optname %d\n", sk, optname); | |
241 | ||
242 | if (level != SOL_NFC) | |
243 | return -ENOPROTOOPT; | |
244 | ||
245 | lock_sock(sk); | |
246 | ||
247 | switch (optname) { | |
248 | case NFC_LLCP_RW: | |
249 | if (sk->sk_state == LLCP_CONNECTED || | |
250 | sk->sk_state == LLCP_BOUND || | |
251 | sk->sk_state == LLCP_LISTEN) { | |
252 | err = -EINVAL; | |
253 | break; | |
254 | } | |
255 | ||
256 | if (get_user(opt, (u32 __user *) optval)) { | |
257 | err = -EFAULT; | |
258 | break; | |
259 | } | |
260 | ||
261 | if (opt > LLCP_MAX_RW) { | |
262 | err = -EINVAL; | |
263 | break; | |
264 | } | |
265 | ||
266 | llcp_sock->rw = (u8) opt; | |
267 | ||
268 | break; | |
269 | ||
270 | case NFC_LLCP_MIUX: | |
271 | if (sk->sk_state == LLCP_CONNECTED || | |
272 | sk->sk_state == LLCP_BOUND || | |
273 | sk->sk_state == LLCP_LISTEN) { | |
274 | err = -EINVAL; | |
275 | break; | |
276 | } | |
277 | ||
278 | if (get_user(opt, (u32 __user *) optval)) { | |
279 | err = -EFAULT; | |
280 | break; | |
281 | } | |
282 | ||
283 | if (opt > LLCP_MAX_MIUX) { | |
284 | err = -EINVAL; | |
285 | break; | |
286 | } | |
287 | ||
5eef6669 | 288 | llcp_sock->miux = cpu_to_be16((u16) opt); |
26fd76ca SO |
289 | |
290 | break; | |
291 | ||
292 | default: | |
293 | err = -ENOPROTOOPT; | |
294 | break; | |
295 | } | |
296 | ||
297 | release_sock(sk); | |
298 | ||
06d44f80 SO |
299 | pr_debug("%p rw %d miux %d\n", llcp_sock, |
300 | llcp_sock->rw, llcp_sock->miux); | |
301 | ||
26fd76ca SO |
302 | return err; |
303 | } | |
304 | ||
305 | static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname, | |
306 | char __user *optval, int __user *optlen) | |
307 | { | |
00e856db | 308 | struct nfc_llcp_local *local; |
26fd76ca SO |
309 | struct sock *sk = sock->sk; |
310 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
311 | int len, err = 0; | |
064f370c | 312 | u16 miux, remote_miu; |
00e856db | 313 | u8 rw; |
26fd76ca SO |
314 | |
315 | pr_debug("%p optname %d\n", sk, optname); | |
316 | ||
317 | if (level != SOL_NFC) | |
318 | return -ENOPROTOOPT; | |
319 | ||
320 | if (get_user(len, optlen)) | |
321 | return -EFAULT; | |
322 | ||
00e856db SO |
323 | local = llcp_sock->local; |
324 | if (!local) | |
325 | return -ENODEV; | |
326 | ||
26fd76ca SO |
327 | len = min_t(u32, len, sizeof(u32)); |
328 | ||
329 | lock_sock(sk); | |
330 | ||
331 | switch (optname) { | |
332 | case NFC_LLCP_RW: | |
00e856db SO |
333 | rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw; |
334 | if (put_user(rw, (u32 __user *) optval)) | |
26fd76ca SO |
335 | err = -EFAULT; |
336 | ||
337 | break; | |
338 | ||
339 | case NFC_LLCP_MIUX: | |
00e856db SO |
340 | miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ? |
341 | be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux); | |
342 | ||
343 | if (put_user(miux, (u32 __user *) optval)) | |
26fd76ca SO |
344 | err = -EFAULT; |
345 | ||
346 | break; | |
347 | ||
064f370c TE |
348 | case NFC_LLCP_REMOTE_MIU: |
349 | remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ? | |
350 | local->remote_miu : llcp_sock->remote_miu; | |
351 | ||
352 | if (put_user(remote_miu, (u32 __user *) optval)) | |
353 | err = -EFAULT; | |
354 | ||
355 | break; | |
356 | ||
357 | case NFC_LLCP_REMOTE_LTO: | |
358 | if (put_user(local->remote_lto / 10, (u32 __user *) optval)) | |
359 | err = -EFAULT; | |
360 | ||
361 | break; | |
362 | ||
363 | case NFC_LLCP_REMOTE_RW: | |
364 | if (put_user(llcp_sock->remote_rw, (u32 __user *) optval)) | |
26fd76ca SO |
365 | err = -EFAULT; |
366 | ||
367 | break; | |
368 | ||
369 | default: | |
370 | err = -ENOPROTOOPT; | |
371 | break; | |
372 | } | |
373 | ||
374 | release_sock(sk); | |
375 | ||
376 | if (put_user(len, optlen)) | |
377 | return -EFAULT; | |
378 | ||
379 | return err; | |
380 | } | |
381 | ||
d646960f SO |
382 | void nfc_llcp_accept_unlink(struct sock *sk) |
383 | { | |
384 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
385 | ||
386 | pr_debug("state %d\n", sk->sk_state); | |
387 | ||
388 | list_del_init(&llcp_sock->accept_queue); | |
389 | sk_acceptq_removed(llcp_sock->parent); | |
390 | llcp_sock->parent = NULL; | |
391 | ||
392 | sock_put(sk); | |
393 | } | |
394 | ||
395 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
396 | { | |
397 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
398 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
399 | ||
400 | /* Lock will be free from unlink */ | |
401 | sock_hold(sk); | |
402 | ||
403 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 404 | &llcp_sock_parent->accept_queue); |
d646960f SO |
405 | llcp_sock->parent = parent; |
406 | sk_acceptq_added(parent); | |
407 | } | |
408 | ||
409 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 410 | struct socket *newsock) |
d646960f SO |
411 | { |
412 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
413 | struct sock *sk; | |
414 | ||
415 | llcp_parent = nfc_llcp_sock(parent); | |
416 | ||
417 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 418 | accept_queue) { |
d646960f SO |
419 | sk = &lsk->sk; |
420 | lock_sock(sk); | |
421 | ||
422 | if (sk->sk_state == LLCP_CLOSED) { | |
423 | release_sock(sk); | |
424 | nfc_llcp_accept_unlink(sk); | |
425 | continue; | |
426 | } | |
427 | ||
428 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
39a352a5 SO |
429 | list_del_init(&lsk->accept_queue); |
430 | sock_put(sk); | |
431 | ||
d646960f SO |
432 | if (newsock) |
433 | sock_graft(sk, newsock); | |
434 | ||
435 | release_sock(sk); | |
436 | ||
437 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
438 | ||
b141e811 SO |
439 | sk_acceptq_removed(parent); |
440 | ||
d646960f SO |
441 | return sk; |
442 | } | |
443 | ||
444 | release_sock(sk); | |
445 | } | |
446 | ||
447 | return NULL; | |
448 | } | |
449 | ||
450 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
cdfbabfb | 451 | int flags, bool kern) |
d646960f SO |
452 | { |
453 | DECLARE_WAITQUEUE(wait, current); | |
454 | struct sock *sk = sock->sk, *new_sk; | |
455 | long timeo; | |
456 | int ret = 0; | |
457 | ||
458 | pr_debug("parent %p\n", sk); | |
459 | ||
460 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
461 | ||
462 | if (sk->sk_state != LLCP_LISTEN) { | |
463 | ret = -EBADFD; | |
464 | goto error; | |
465 | } | |
466 | ||
467 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
468 | ||
469 | /* Wait for an incoming connection. */ | |
470 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
471 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
472 | set_current_state(TASK_INTERRUPTIBLE); | |
473 | ||
474 | if (!timeo) { | |
475 | ret = -EAGAIN; | |
476 | break; | |
477 | } | |
478 | ||
479 | if (signal_pending(current)) { | |
480 | ret = sock_intr_errno(timeo); | |
481 | break; | |
482 | } | |
483 | ||
484 | release_sock(sk); | |
485 | timeo = schedule_timeout(timeo); | |
486 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
487 | } | |
488 | __set_current_state(TASK_RUNNING); | |
489 | remove_wait_queue(sk_sleep(sk), &wait); | |
490 | ||
491 | if (ret) | |
492 | goto error; | |
493 | ||
494 | newsock->state = SS_CONNECTED; | |
495 | ||
496 | pr_debug("new socket %p\n", new_sk); | |
497 | ||
498 | error: | |
499 | release_sock(sk); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | ||
12e5bdfe | 504 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, |
d646960f SO |
505 | int *len, int peer) |
506 | { | |
d646960f SO |
507 | struct sock *sk = sock->sk; |
508 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
12e5bdfe | 509 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); |
d646960f | 510 | |
fe3c094a SO |
511 | if (llcp_sock == NULL || llcp_sock->dev == NULL) |
512 | return -EBADFD; | |
513 | ||
12e5bdfe SO |
514 | pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, |
515 | llcp_sock->dsap, llcp_sock->ssap); | |
d646960f | 516 | |
5ffedc6e | 517 | memset(llcp_addr, 0, sizeof(*llcp_addr)); |
d646960f SO |
518 | *len = sizeof(struct sockaddr_nfc_llcp); |
519 | ||
03c05355 CW |
520 | lock_sock(sk); |
521 | if (!llcp_sock->dev) { | |
522 | release_sock(sk); | |
523 | return -EBADFD; | |
524 | } | |
5ffedc6e | 525 | llcp_addr->sa_family = AF_NFC; |
d646960f | 526 | llcp_addr->dev_idx = llcp_sock->dev->idx; |
12e5bdfe | 527 | llcp_addr->target_idx = llcp_sock->target_idx; |
5ffedc6e | 528 | llcp_addr->nfc_protocol = llcp_sock->nfc_protocol; |
d646960f SO |
529 | llcp_addr->dsap = llcp_sock->dsap; |
530 | llcp_addr->ssap = llcp_sock->ssap; | |
531 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
532 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 533 | llcp_addr->service_name_len); |
03c05355 | 534 | release_sock(sk); |
d646960f SO |
535 | |
536 | return 0; | |
537 | } | |
538 | ||
539 | static inline unsigned int llcp_accept_poll(struct sock *parent) | |
540 | { | |
413df10b | 541 | struct nfc_llcp_sock *llcp_sock, *parent_sock; |
d646960f SO |
542 | struct sock *sk; |
543 | ||
544 | parent_sock = nfc_llcp_sock(parent); | |
545 | ||
413df10b AL |
546 | list_for_each_entry(llcp_sock, &parent_sock->accept_queue, |
547 | accept_queue) { | |
d646960f SO |
548 | sk = &llcp_sock->sk; |
549 | ||
550 | if (sk->sk_state == LLCP_CONNECTED) | |
551 | return POLLIN | POLLRDNORM; | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static unsigned int llcp_sock_poll(struct file *file, struct socket *sock, | |
427a2eb1 | 558 | poll_table *wait) |
d646960f SO |
559 | { |
560 | struct sock *sk = sock->sk; | |
561 | unsigned int mask = 0; | |
562 | ||
563 | pr_debug("%p\n", sk); | |
564 | ||
565 | sock_poll_wait(file, sk_sleep(sk), wait); | |
566 | ||
567 | if (sk->sk_state == LLCP_LISTEN) | |
568 | return llcp_accept_poll(sk); | |
569 | ||
09f6676b | 570 | if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue)) |
7d4c04fc | 571 | mask |= POLLERR | |
8facd5fb | 572 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
d646960f | 573 | |
09f6676b | 574 | if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) |
4260c13b | 575 | mask |= POLLIN | POLLRDNORM; |
d646960f SO |
576 | |
577 | if (sk->sk_state == LLCP_CLOSED) | |
578 | mask |= POLLHUP; | |
579 | ||
4260c13b SO |
580 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
581 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; | |
582 | ||
583 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
584 | mask |= POLLHUP; | |
585 | ||
b4011239 | 586 | if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED) |
4260c13b SO |
587 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
588 | else | |
9cd3e072 | 589 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
4260c13b SO |
590 | |
591 | pr_debug("mask 0x%x\n", mask); | |
592 | ||
d646960f SO |
593 | return mask; |
594 | } | |
595 | ||
596 | static int llcp_sock_release(struct socket *sock) | |
597 | { | |
598 | struct sock *sk = sock->sk; | |
599 | struct nfc_llcp_local *local; | |
600 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 601 | int err = 0; |
d646960f SO |
602 | |
603 | if (!sk) | |
604 | return 0; | |
605 | ||
606 | pr_debug("%p\n", sk); | |
607 | ||
608 | local = llcp_sock->local; | |
40c75f81 SO |
609 | if (local == NULL) { |
610 | err = -ENODEV; | |
611 | goto out; | |
612 | } | |
d646960f | 613 | |
d646960f SO |
614 | lock_sock(sk); |
615 | ||
616 | /* Send a DISC */ | |
617 | if (sk->sk_state == LLCP_CONNECTED) | |
58e3dd15 | 618 | nfc_llcp_send_disconnect(llcp_sock); |
d646960f SO |
619 | |
620 | if (sk->sk_state == LLCP_LISTEN) { | |
621 | struct nfc_llcp_sock *lsk, *n; | |
622 | struct sock *accept_sk; | |
623 | ||
624 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 625 | accept_queue) { |
d646960f SO |
626 | accept_sk = &lsk->sk; |
627 | lock_sock(accept_sk); | |
628 | ||
58e3dd15 | 629 | nfc_llcp_send_disconnect(lsk); |
d646960f SO |
630 | nfc_llcp_accept_unlink(accept_sk); |
631 | ||
632 | release_sock(accept_sk); | |
d646960f SO |
633 | } |
634 | } | |
635 | ||
cbbf4721 SO |
636 | if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) |
637 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
d646960f | 638 | |
d646960f SO |
639 | release_sock(sk); |
640 | ||
17f7ae16 TE |
641 | /* Keep this sock alive and therefore do not remove it from the sockets |
642 | * list until the DISC PDU has been actually sent. Otherwise we would | |
643 | * reply with DM PDUs before sending the DISC one. | |
644 | */ | |
645 | if (sk->sk_state == LLCP_DISCONNECTING) | |
646 | return err; | |
647 | ||
4463523b TE |
648 | if (sock->type == SOCK_RAW) |
649 | nfc_llcp_sock_unlink(&local->raw_sockets, sk); | |
650 | else | |
651 | nfc_llcp_sock_unlink(&local->sockets, sk); | |
a69f32af | 652 | |
40c75f81 | 653 | out: |
d646960f SO |
654 | sock_orphan(sk); |
655 | sock_put(sk); | |
656 | ||
40c75f81 | 657 | return err; |
d646960f SO |
658 | } |
659 | ||
660 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 661 | int len, int flags) |
d646960f SO |
662 | { |
663 | struct sock *sk = sock->sk; | |
664 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
665 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
666 | struct nfc_dev *dev; | |
667 | struct nfc_llcp_local *local; | |
668 | int ret = 0; | |
669 | ||
670 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
671 | ||
608c4adf | 672 | if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC) |
d646960f | 673 | return -EINVAL; |
d646960f | 674 | |
32418cfe | 675 | if (addr->service_name_len == 0 && addr->dsap == 0) |
d646960f | 676 | return -EINVAL; |
d646960f SO |
677 | |
678 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 679 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
680 | |
681 | lock_sock(sk); | |
682 | ||
683 | if (sk->sk_state == LLCP_CONNECTED) { | |
684 | ret = -EISCONN; | |
685 | goto error; | |
686 | } | |
687 | ||
688 | dev = nfc_get_device(addr->dev_idx); | |
689 | if (dev == NULL) { | |
690 | ret = -ENODEV; | |
691 | goto error; | |
692 | } | |
693 | ||
694 | local = nfc_llcp_find_local(dev); | |
695 | if (local == NULL) { | |
696 | ret = -ENODEV; | |
697 | goto put_dev; | |
698 | } | |
699 | ||
700 | device_lock(&dev->dev); | |
701 | if (dev->dep_link_up == false) { | |
702 | ret = -ENOLINK; | |
703 | device_unlock(&dev->dev); | |
704 | goto put_dev; | |
705 | } | |
706 | device_unlock(&dev->dev); | |
707 | ||
708 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 709 | addr->target_idx != local->target_idx) { |
d646960f SO |
710 | ret = -ENOLINK; |
711 | goto put_dev; | |
712 | } | |
713 | ||
714 | llcp_sock->dev = dev; | |
c7aa1225 | 715 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
716 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
717 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
718 | ret = -ENOMEM; | |
719 | goto put_dev; | |
720 | } | |
cbbf4721 SO |
721 | |
722 | llcp_sock->reserved_ssap = llcp_sock->ssap; | |
723 | ||
d646960f SO |
724 | if (addr->service_name_len == 0) |
725 | llcp_sock->dsap = addr->dsap; | |
726 | else | |
727 | llcp_sock->dsap = LLCP_SAP_SDP; | |
728 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
729 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
730 | addr->service_name_len, |
731 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 732 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
733 | llcp_sock->service_name_len, |
734 | GFP_KERNEL); | |
d646960f | 735 | |
a69f32af | 736 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
737 | |
738 | ret = nfc_llcp_send_connect(llcp_sock); | |
739 | if (ret) | |
a69f32af | 740 | goto sock_unlink; |
d646960f | 741 | |
b4011239 SO |
742 | sk->sk_state = LLCP_CONNECTING; |
743 | ||
ff353d86 SO |
744 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
745 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
b4011239 | 746 | if (ret && ret != -EINPROGRESS) |
a69f32af | 747 | goto sock_unlink; |
d646960f SO |
748 | |
749 | release_sock(sk); | |
ff353d86 | 750 | |
b4011239 | 751 | return ret; |
d646960f | 752 | |
a69f32af SO |
753 | sock_unlink: |
754 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
755 | ||
756 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
757 | ||
d646960f SO |
758 | put_dev: |
759 | nfc_put_device(dev); | |
760 | ||
761 | error: | |
762 | release_sock(sk); | |
763 | return ret; | |
764 | } | |
765 | ||
1b784140 YX |
766 | static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
767 | size_t len) | |
53a0ac2e SO |
768 | { |
769 | struct sock *sk = sock->sk; | |
770 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
771 | int ret; | |
772 | ||
773 | pr_debug("sock %p sk %p", sock, sk); | |
774 | ||
775 | ret = sock_error(sk); | |
776 | if (ret) | |
777 | return ret; | |
778 | ||
779 | if (msg->msg_flags & MSG_OOB) | |
780 | return -EOPNOTSUPP; | |
781 | ||
782 | lock_sock(sk); | |
783 | ||
b874dec2 | 784 | if (sk->sk_type == SOCK_DGRAM) { |
342dfc30 SH |
785 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr, |
786 | msg->msg_name); | |
b874dec2 SO |
787 | |
788 | if (msg->msg_namelen < sizeof(*addr)) { | |
789 | release_sock(sk); | |
b874dec2 SO |
790 | return -EINVAL; |
791 | } | |
792 | ||
793 | release_sock(sk); | |
794 | ||
795 | return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap, | |
796 | msg, len); | |
797 | } | |
798 | ||
53a0ac2e SO |
799 | if (sk->sk_state != LLCP_CONNECTED) { |
800 | release_sock(sk); | |
801 | return -ENOTCONN; | |
802 | } | |
803 | ||
804 | release_sock(sk); | |
805 | ||
806 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
807 | } | |
808 | ||
1b784140 YX |
809 | static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
810 | size_t len, int flags) | |
d646960f SO |
811 | { |
812 | int noblock = flags & MSG_DONTWAIT; | |
813 | struct sock *sk = sock->sk; | |
814 | unsigned int copied, rlen; | |
815 | struct sk_buff *skb, *cskb; | |
816 | int err = 0; | |
817 | ||
818 | pr_debug("%p %zu\n", sk, len); | |
819 | ||
820 | lock_sock(sk); | |
821 | ||
822 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 823 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
824 | release_sock(sk); |
825 | return 0; | |
826 | } | |
827 | ||
828 | release_sock(sk); | |
829 | ||
830 | if (flags & (MSG_OOB)) | |
831 | return -EOPNOTSUPP; | |
832 | ||
833 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
834 | if (!skb) { | |
835 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 836 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
837 | |
838 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
839 | return 0; | |
840 | ||
841 | return err; | |
842 | } | |
843 | ||
427a2eb1 | 844 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
845 | copied = min_t(unsigned int, rlen, len); |
846 | ||
847 | cskb = skb; | |
51f3d02b | 848 | if (skb_copy_datagram_msg(cskb, 0, msg, copied)) { |
d646960f SO |
849 | if (!(flags & MSG_PEEK)) |
850 | skb_queue_head(&sk->sk_receive_queue, skb); | |
851 | return -EFAULT; | |
852 | } | |
853 | ||
2c2d45bd TE |
854 | sock_recv_timestamp(msg, sk, skb); |
855 | ||
31ca61a8 SO |
856 | if (sk->sk_type == SOCK_DGRAM && msg->msg_name) { |
857 | struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb); | |
342dfc30 SH |
858 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr, |
859 | msg->msg_name); | |
31ca61a8 | 860 | |
fad2e371 | 861 | msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp); |
31ca61a8 | 862 | |
fad2e371 | 863 | pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); |
31ca61a8 | 864 | |
d26d6504 | 865 | memset(sockaddr, 0, sizeof(*sockaddr)); |
fad2e371 SO |
866 | sockaddr->sa_family = AF_NFC; |
867 | sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; | |
868 | sockaddr->dsap = ui_cb->dsap; | |
869 | sockaddr->ssap = ui_cb->ssap; | |
31ca61a8 SO |
870 | } |
871 | ||
d646960f SO |
872 | /* Mark read part of skb as used */ |
873 | if (!(flags & MSG_PEEK)) { | |
874 | ||
875 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
31ca61a8 SO |
876 | if (sk->sk_type == SOCK_STREAM || |
877 | sk->sk_type == SOCK_DGRAM || | |
878 | sk->sk_type == SOCK_RAW) { | |
d646960f SO |
879 | skb_pull(skb, copied); |
880 | if (skb->len) { | |
881 | skb_queue_head(&sk->sk_receive_queue, skb); | |
882 | goto done; | |
883 | } | |
884 | } | |
885 | ||
886 | kfree_skb(skb); | |
887 | } | |
888 | ||
889 | /* XXX Queue backlogged skbs */ | |
890 | ||
891 | done: | |
892 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
893 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
894 | copied = rlen; | |
895 | ||
896 | return copied; | |
897 | } | |
898 | ||
899 | static const struct proto_ops llcp_sock_ops = { | |
900 | .family = PF_NFC, | |
901 | .owner = THIS_MODULE, | |
902 | .bind = llcp_sock_bind, | |
903 | .connect = llcp_sock_connect, | |
904 | .release = llcp_sock_release, | |
905 | .socketpair = sock_no_socketpair, | |
906 | .accept = llcp_sock_accept, | |
907 | .getname = llcp_sock_getname, | |
908 | .poll = llcp_sock_poll, | |
909 | .ioctl = sock_no_ioctl, | |
910 | .listen = llcp_sock_listen, | |
911 | .shutdown = sock_no_shutdown, | |
26fd76ca SO |
912 | .setsockopt = nfc_llcp_setsockopt, |
913 | .getsockopt = nfc_llcp_getsockopt, | |
53a0ac2e | 914 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
915 | .recvmsg = llcp_sock_recvmsg, |
916 | .mmap = sock_no_mmap, | |
917 | }; | |
918 | ||
4463523b TE |
919 | static const struct proto_ops llcp_rawsock_ops = { |
920 | .family = PF_NFC, | |
921 | .owner = THIS_MODULE, | |
922 | .bind = llcp_raw_sock_bind, | |
923 | .connect = sock_no_connect, | |
924 | .release = llcp_sock_release, | |
925 | .socketpair = sock_no_socketpair, | |
926 | .accept = sock_no_accept, | |
927 | .getname = llcp_sock_getname, | |
928 | .poll = llcp_sock_poll, | |
929 | .ioctl = sock_no_ioctl, | |
930 | .listen = sock_no_listen, | |
931 | .shutdown = sock_no_shutdown, | |
932 | .setsockopt = sock_no_setsockopt, | |
933 | .getsockopt = sock_no_getsockopt, | |
934 | .sendmsg = sock_no_sendmsg, | |
935 | .recvmsg = llcp_sock_recvmsg, | |
936 | .mmap = sock_no_mmap, | |
937 | }; | |
938 | ||
d646960f SO |
939 | static void llcp_sock_destruct(struct sock *sk) |
940 | { | |
941 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
942 | ||
943 | pr_debug("%p\n", sk); | |
944 | ||
945 | if (sk->sk_state == LLCP_CONNECTED) | |
946 | nfc_put_device(llcp_sock->dev); | |
947 | ||
948 | skb_queue_purge(&sk->sk_receive_queue); | |
949 | ||
950 | nfc_llcp_sock_free(llcp_sock); | |
951 | ||
952 | if (!sock_flag(sk, SOCK_DEAD)) { | |
953 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
954 | return; | |
955 | } | |
956 | } | |
957 | ||
11aa9c28 | 958 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern) |
d646960f SO |
959 | { |
960 | struct sock *sk; | |
961 | struct nfc_llcp_sock *llcp_sock; | |
962 | ||
11aa9c28 | 963 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern); |
d646960f SO |
964 | if (!sk) |
965 | return NULL; | |
966 | ||
967 | llcp_sock = nfc_llcp_sock(sk); | |
968 | ||
969 | sock_init_data(sock, sk); | |
970 | sk->sk_state = LLCP_CLOSED; | |
971 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
972 | sk->sk_type = type; | |
973 | sk->sk_destruct = llcp_sock_destruct; | |
974 | ||
975 | llcp_sock->ssap = 0; | |
976 | llcp_sock->dsap = LLCP_SAP_SDP; | |
06d44f80 | 977 | llcp_sock->rw = LLCP_MAX_RW + 1; |
5eef6669 | 978 | llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1); |
d646960f SO |
979 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; |
980 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
981 | llcp_sock->remote_ready = 1; | |
cbbf4721 | 982 | llcp_sock->reserved_ssap = LLCP_SAP_MAX; |
abd18d43 | 983 | nfc_llcp_socket_remote_param_init(llcp_sock); |
d646960f SO |
984 | skb_queue_head_init(&llcp_sock->tx_queue); |
985 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
d646960f SO |
986 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
987 | ||
988 | if (sock != NULL) | |
989 | sock->state = SS_UNCONNECTED; | |
990 | ||
991 | return sk; | |
992 | } | |
993 | ||
994 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
995 | { | |
996 | kfree(sock->service_name); | |
997 | ||
998 | skb_queue_purge(&sock->tx_queue); | |
999 | skb_queue_purge(&sock->tx_pending_queue); | |
d646960f SO |
1000 | |
1001 | list_del_init(&sock->accept_queue); | |
40c75f81 | 1002 | |
d646960f | 1003 | sock->parent = NULL; |
c7aa1225 SO |
1004 | |
1005 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
1006 | } |
1007 | ||
1008 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
11aa9c28 | 1009 | const struct nfc_protocol *nfc_proto, int kern) |
d646960f SO |
1010 | { |
1011 | struct sock *sk; | |
1012 | ||
1013 | pr_debug("%p\n", sock); | |
1014 | ||
4463523b TE |
1015 | if (sock->type != SOCK_STREAM && |
1016 | sock->type != SOCK_DGRAM && | |
1017 | sock->type != SOCK_RAW) | |
d646960f SO |
1018 | return -ESOCKTNOSUPPORT; |
1019 | ||
c559600c ON |
1020 | if (sock->type == SOCK_RAW) { |
1021 | if (!capable(CAP_NET_RAW)) | |
1022 | return -EPERM; | |
4463523b | 1023 | sock->ops = &llcp_rawsock_ops; |
c559600c | 1024 | } else { |
4463523b | 1025 | sock->ops = &llcp_sock_ops; |
c559600c | 1026 | } |
d646960f | 1027 | |
11aa9c28 | 1028 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern); |
d646960f SO |
1029 | if (sk == NULL) |
1030 | return -ENOMEM; | |
1031 | ||
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | static const struct nfc_protocol llcp_nfc_proto = { | |
1036 | .id = NFC_SOCKPROTO_LLCP, | |
1037 | .proto = &llcp_sock_proto, | |
1038 | .owner = THIS_MODULE, | |
1039 | .create = llcp_sock_create | |
1040 | }; | |
1041 | ||
1042 | int __init nfc_llcp_sock_init(void) | |
1043 | { | |
1044 | return nfc_proto_register(&llcp_nfc_proto); | |
1045 | } | |
1046 | ||
1047 | void nfc_llcp_sock_exit(void) | |
1048 | { | |
1049 | nfc_proto_unregister(&llcp_nfc_proto); | |
1050 | } |