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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); | |
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 | ||
f6a5885f MJ |
155 | if (!addr || alen < offsetofend(struct sockaddr, sa_family) || |
156 | addr->sa_family != AF_NFC) | |
4463523b TE |
157 | return -EINVAL; |
158 | ||
159 | pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family); | |
160 | ||
161 | memset(&llcp_addr, 0, sizeof(llcp_addr)); | |
162 | len = min_t(unsigned int, sizeof(llcp_addr), alen); | |
163 | memcpy(&llcp_addr, addr, len); | |
164 | ||
165 | lock_sock(sk); | |
166 | ||
167 | if (sk->sk_state != LLCP_CLOSED) { | |
168 | ret = -EBADFD; | |
169 | goto error; | |
170 | } | |
171 | ||
172 | dev = nfc_get_device(llcp_addr.dev_idx); | |
173 | if (dev == NULL) { | |
174 | ret = -ENODEV; | |
175 | goto error; | |
176 | } | |
177 | ||
178 | local = nfc_llcp_find_local(dev); | |
179 | if (local == NULL) { | |
180 | ret = -ENODEV; | |
181 | goto put_dev; | |
182 | } | |
183 | ||
184 | llcp_sock->dev = dev; | |
185 | llcp_sock->local = nfc_llcp_local_get(local); | |
186 | llcp_sock->nfc_protocol = llcp_addr.nfc_protocol; | |
187 | ||
188 | nfc_llcp_sock_link(&local->raw_sockets, sk); | |
189 | ||
190 | sk->sk_state = LLCP_BOUND; | |
191 | ||
192 | put_dev: | |
193 | nfc_put_device(dev); | |
194 | ||
195 | error: | |
196 | release_sock(sk); | |
197 | return ret; | |
198 | } | |
199 | ||
d646960f SO |
200 | static int llcp_sock_listen(struct socket *sock, int backlog) |
201 | { | |
202 | struct sock *sk = sock->sk; | |
203 | int ret = 0; | |
204 | ||
205 | pr_debug("sk %p backlog %d\n", sk, backlog); | |
206 | ||
207 | lock_sock(sk); | |
208 | ||
874934f4 SJ |
209 | if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) || |
210 | sk->sk_state != LLCP_BOUND) { | |
d646960f SO |
211 | ret = -EBADFD; |
212 | goto error; | |
213 | } | |
214 | ||
215 | sk->sk_max_ack_backlog = backlog; | |
216 | sk->sk_ack_backlog = 0; | |
217 | ||
218 | pr_debug("Socket listening\n"); | |
219 | sk->sk_state = LLCP_LISTEN; | |
220 | ||
221 | error: | |
222 | release_sock(sk); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
26fd76ca SO |
227 | static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname, |
228 | char __user *optval, unsigned int optlen) | |
229 | { | |
230 | struct sock *sk = sock->sk; | |
231 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
232 | u32 opt; | |
233 | int err = 0; | |
234 | ||
235 | pr_debug("%p optname %d\n", sk, optname); | |
236 | ||
237 | if (level != SOL_NFC) | |
238 | return -ENOPROTOOPT; | |
239 | ||
240 | lock_sock(sk); | |
241 | ||
242 | switch (optname) { | |
243 | case NFC_LLCP_RW: | |
244 | if (sk->sk_state == LLCP_CONNECTED || | |
245 | sk->sk_state == LLCP_BOUND || | |
246 | sk->sk_state == LLCP_LISTEN) { | |
247 | err = -EINVAL; | |
248 | break; | |
249 | } | |
250 | ||
251 | if (get_user(opt, (u32 __user *) optval)) { | |
252 | err = -EFAULT; | |
253 | break; | |
254 | } | |
255 | ||
256 | if (opt > LLCP_MAX_RW) { | |
257 | err = -EINVAL; | |
258 | break; | |
259 | } | |
260 | ||
261 | llcp_sock->rw = (u8) opt; | |
262 | ||
263 | break; | |
264 | ||
265 | case NFC_LLCP_MIUX: | |
266 | if (sk->sk_state == LLCP_CONNECTED || | |
267 | sk->sk_state == LLCP_BOUND || | |
268 | sk->sk_state == LLCP_LISTEN) { | |
269 | err = -EINVAL; | |
270 | break; | |
271 | } | |
272 | ||
273 | if (get_user(opt, (u32 __user *) optval)) { | |
274 | err = -EFAULT; | |
275 | break; | |
276 | } | |
277 | ||
278 | if (opt > LLCP_MAX_MIUX) { | |
279 | err = -EINVAL; | |
280 | break; | |
281 | } | |
282 | ||
5eef6669 | 283 | llcp_sock->miux = cpu_to_be16((u16) opt); |
26fd76ca SO |
284 | |
285 | break; | |
286 | ||
287 | default: | |
288 | err = -ENOPROTOOPT; | |
289 | break; | |
290 | } | |
291 | ||
292 | release_sock(sk); | |
293 | ||
06d44f80 SO |
294 | pr_debug("%p rw %d miux %d\n", llcp_sock, |
295 | llcp_sock->rw, llcp_sock->miux); | |
296 | ||
26fd76ca SO |
297 | return err; |
298 | } | |
299 | ||
300 | static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname, | |
301 | char __user *optval, int __user *optlen) | |
302 | { | |
00e856db | 303 | struct nfc_llcp_local *local; |
26fd76ca SO |
304 | struct sock *sk = sock->sk; |
305 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
306 | int len, err = 0; | |
064f370c | 307 | u16 miux, remote_miu; |
00e856db | 308 | u8 rw; |
26fd76ca SO |
309 | |
310 | pr_debug("%p optname %d\n", sk, optname); | |
311 | ||
312 | if (level != SOL_NFC) | |
313 | return -ENOPROTOOPT; | |
314 | ||
315 | if (get_user(len, optlen)) | |
316 | return -EFAULT; | |
317 | ||
00e856db SO |
318 | local = llcp_sock->local; |
319 | if (!local) | |
320 | return -ENODEV; | |
321 | ||
26fd76ca SO |
322 | len = min_t(u32, len, sizeof(u32)); |
323 | ||
324 | lock_sock(sk); | |
325 | ||
326 | switch (optname) { | |
327 | case NFC_LLCP_RW: | |
00e856db SO |
328 | rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw; |
329 | if (put_user(rw, (u32 __user *) optval)) | |
26fd76ca SO |
330 | err = -EFAULT; |
331 | ||
332 | break; | |
333 | ||
334 | case NFC_LLCP_MIUX: | |
00e856db SO |
335 | miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ? |
336 | be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux); | |
337 | ||
338 | if (put_user(miux, (u32 __user *) optval)) | |
26fd76ca SO |
339 | err = -EFAULT; |
340 | ||
341 | break; | |
342 | ||
064f370c TE |
343 | case NFC_LLCP_REMOTE_MIU: |
344 | remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ? | |
345 | local->remote_miu : llcp_sock->remote_miu; | |
346 | ||
347 | if (put_user(remote_miu, (u32 __user *) optval)) | |
348 | err = -EFAULT; | |
349 | ||
350 | break; | |
351 | ||
352 | case NFC_LLCP_REMOTE_LTO: | |
353 | if (put_user(local->remote_lto / 10, (u32 __user *) optval)) | |
354 | err = -EFAULT; | |
355 | ||
356 | break; | |
357 | ||
358 | case NFC_LLCP_REMOTE_RW: | |
359 | if (put_user(llcp_sock->remote_rw, (u32 __user *) optval)) | |
26fd76ca SO |
360 | err = -EFAULT; |
361 | ||
362 | break; | |
363 | ||
364 | default: | |
365 | err = -ENOPROTOOPT; | |
366 | break; | |
367 | } | |
368 | ||
369 | release_sock(sk); | |
370 | ||
371 | if (put_user(len, optlen)) | |
372 | return -EFAULT; | |
373 | ||
374 | return err; | |
375 | } | |
376 | ||
d646960f SO |
377 | void nfc_llcp_accept_unlink(struct sock *sk) |
378 | { | |
379 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
380 | ||
381 | pr_debug("state %d\n", sk->sk_state); | |
382 | ||
383 | list_del_init(&llcp_sock->accept_queue); | |
384 | sk_acceptq_removed(llcp_sock->parent); | |
385 | llcp_sock->parent = NULL; | |
386 | ||
387 | sock_put(sk); | |
388 | } | |
389 | ||
390 | void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk) | |
391 | { | |
392 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
393 | struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent); | |
394 | ||
395 | /* Lock will be free from unlink */ | |
396 | sock_hold(sk); | |
397 | ||
398 | list_add_tail(&llcp_sock->accept_queue, | |
427a2eb1 | 399 | &llcp_sock_parent->accept_queue); |
d646960f SO |
400 | llcp_sock->parent = parent; |
401 | sk_acceptq_added(parent); | |
402 | } | |
403 | ||
404 | struct sock *nfc_llcp_accept_dequeue(struct sock *parent, | |
427a2eb1 | 405 | struct socket *newsock) |
d646960f SO |
406 | { |
407 | struct nfc_llcp_sock *lsk, *n, *llcp_parent; | |
408 | struct sock *sk; | |
409 | ||
410 | llcp_parent = nfc_llcp_sock(parent); | |
411 | ||
412 | list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue, | |
427a2eb1 | 413 | accept_queue) { |
d646960f SO |
414 | sk = &lsk->sk; |
415 | lock_sock(sk); | |
416 | ||
417 | if (sk->sk_state == LLCP_CLOSED) { | |
418 | release_sock(sk); | |
419 | nfc_llcp_accept_unlink(sk); | |
420 | continue; | |
421 | } | |
422 | ||
423 | if (sk->sk_state == LLCP_CONNECTED || !newsock) { | |
39a352a5 SO |
424 | list_del_init(&lsk->accept_queue); |
425 | sock_put(sk); | |
426 | ||
d646960f SO |
427 | if (newsock) |
428 | sock_graft(sk, newsock); | |
429 | ||
430 | release_sock(sk); | |
431 | ||
432 | pr_debug("Returning sk state %d\n", sk->sk_state); | |
433 | ||
b141e811 SO |
434 | sk_acceptq_removed(parent); |
435 | ||
d646960f SO |
436 | return sk; |
437 | } | |
438 | ||
439 | release_sock(sk); | |
440 | } | |
441 | ||
442 | return NULL; | |
443 | } | |
444 | ||
445 | static int llcp_sock_accept(struct socket *sock, struct socket *newsock, | |
cdfbabfb | 446 | int flags, bool kern) |
d646960f SO |
447 | { |
448 | DECLARE_WAITQUEUE(wait, current); | |
449 | struct sock *sk = sock->sk, *new_sk; | |
450 | long timeo; | |
451 | int ret = 0; | |
452 | ||
453 | pr_debug("parent %p\n", sk); | |
454 | ||
455 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
456 | ||
457 | if (sk->sk_state != LLCP_LISTEN) { | |
458 | ret = -EBADFD; | |
459 | goto error; | |
460 | } | |
461 | ||
462 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
463 | ||
464 | /* Wait for an incoming connection. */ | |
465 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
466 | while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) { | |
467 | set_current_state(TASK_INTERRUPTIBLE); | |
468 | ||
469 | if (!timeo) { | |
470 | ret = -EAGAIN; | |
471 | break; | |
472 | } | |
473 | ||
474 | if (signal_pending(current)) { | |
475 | ret = sock_intr_errno(timeo); | |
476 | break; | |
477 | } | |
478 | ||
479 | release_sock(sk); | |
480 | timeo = schedule_timeout(timeo); | |
481 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
482 | } | |
483 | __set_current_state(TASK_RUNNING); | |
484 | remove_wait_queue(sk_sleep(sk), &wait); | |
485 | ||
486 | if (ret) | |
487 | goto error; | |
488 | ||
489 | newsock->state = SS_CONNECTED; | |
490 | ||
491 | pr_debug("new socket %p\n", new_sk); | |
492 | ||
493 | error: | |
494 | release_sock(sk); | |
495 | ||
496 | return ret; | |
497 | } | |
498 | ||
12e5bdfe | 499 | static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr, |
9b2c45d4 | 500 | int peer) |
d646960f | 501 | { |
d646960f SO |
502 | struct sock *sk = sock->sk; |
503 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
12e5bdfe | 504 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr); |
d646960f | 505 | |
fe3c094a SO |
506 | if (llcp_sock == NULL || llcp_sock->dev == NULL) |
507 | return -EBADFD; | |
508 | ||
12e5bdfe SO |
509 | pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx, |
510 | llcp_sock->dsap, llcp_sock->ssap); | |
d646960f | 511 | |
5ffedc6e | 512 | memset(llcp_addr, 0, sizeof(*llcp_addr)); |
d646960f | 513 | |
03c05355 CW |
514 | lock_sock(sk); |
515 | if (!llcp_sock->dev) { | |
516 | release_sock(sk); | |
517 | return -EBADFD; | |
518 | } | |
5ffedc6e | 519 | llcp_addr->sa_family = AF_NFC; |
d646960f | 520 | llcp_addr->dev_idx = llcp_sock->dev->idx; |
12e5bdfe | 521 | llcp_addr->target_idx = llcp_sock->target_idx; |
5ffedc6e | 522 | llcp_addr->nfc_protocol = llcp_sock->nfc_protocol; |
d646960f SO |
523 | llcp_addr->dsap = llcp_sock->dsap; |
524 | llcp_addr->ssap = llcp_sock->ssap; | |
525 | llcp_addr->service_name_len = llcp_sock->service_name_len; | |
526 | memcpy(llcp_addr->service_name, llcp_sock->service_name, | |
427a2eb1 | 527 | llcp_addr->service_name_len); |
03c05355 | 528 | release_sock(sk); |
d646960f | 529 | |
9b2c45d4 | 530 | return sizeof(struct sockaddr_nfc_llcp); |
d646960f SO |
531 | } |
532 | ||
ade994f4 | 533 | static inline __poll_t llcp_accept_poll(struct sock *parent) |
d646960f | 534 | { |
413df10b | 535 | struct nfc_llcp_sock *llcp_sock, *parent_sock; |
d646960f SO |
536 | struct sock *sk; |
537 | ||
538 | parent_sock = nfc_llcp_sock(parent); | |
539 | ||
413df10b AL |
540 | list_for_each_entry(llcp_sock, &parent_sock->accept_queue, |
541 | accept_queue) { | |
d646960f SO |
542 | sk = &llcp_sock->sk; |
543 | ||
544 | if (sk->sk_state == LLCP_CONNECTED) | |
a9a08845 | 545 | return EPOLLIN | EPOLLRDNORM; |
d646960f SO |
546 | } |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
a11e1d43 LT |
551 | static __poll_t llcp_sock_poll(struct file *file, struct socket *sock, |
552 | poll_table *wait) | |
d646960f SO |
553 | { |
554 | struct sock *sk = sock->sk; | |
ade994f4 | 555 | __poll_t mask = 0; |
d646960f SO |
556 | |
557 | pr_debug("%p\n", sk); | |
558 | ||
dd979b4d | 559 | sock_poll_wait(file, wait); |
a11e1d43 | 560 | |
d646960f SO |
561 | if (sk->sk_state == LLCP_LISTEN) |
562 | return llcp_accept_poll(sk); | |
563 | ||
564 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) | |
a9a08845 LT |
565 | mask |= EPOLLERR | |
566 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); | |
d646960f SO |
567 | |
568 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
a9a08845 | 569 | mask |= EPOLLIN | EPOLLRDNORM; |
d646960f SO |
570 | |
571 | if (sk->sk_state == LLCP_CLOSED) | |
a9a08845 | 572 | mask |= EPOLLHUP; |
d646960f | 573 | |
4260c13b | 574 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 575 | mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM; |
4260c13b SO |
576 | |
577 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
a9a08845 | 578 | mask |= EPOLLHUP; |
4260c13b | 579 | |
b4011239 | 580 | if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED) |
a9a08845 | 581 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
4260c13b | 582 | else |
9cd3e072 | 583 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
4260c13b SO |
584 | |
585 | pr_debug("mask 0x%x\n", mask); | |
586 | ||
d646960f SO |
587 | return mask; |
588 | } | |
589 | ||
590 | static int llcp_sock_release(struct socket *sock) | |
591 | { | |
592 | struct sock *sk = sock->sk; | |
593 | struct nfc_llcp_local *local; | |
594 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
40c75f81 | 595 | int err = 0; |
d646960f SO |
596 | |
597 | if (!sk) | |
598 | return 0; | |
599 | ||
600 | pr_debug("%p\n", sk); | |
601 | ||
602 | local = llcp_sock->local; | |
40c75f81 SO |
603 | if (local == NULL) { |
604 | err = -ENODEV; | |
605 | goto out; | |
606 | } | |
d646960f | 607 | |
d646960f SO |
608 | lock_sock(sk); |
609 | ||
610 | /* Send a DISC */ | |
611 | if (sk->sk_state == LLCP_CONNECTED) | |
58e3dd15 | 612 | nfc_llcp_send_disconnect(llcp_sock); |
d646960f SO |
613 | |
614 | if (sk->sk_state == LLCP_LISTEN) { | |
615 | struct nfc_llcp_sock *lsk, *n; | |
616 | struct sock *accept_sk; | |
617 | ||
618 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, | |
427a2eb1 | 619 | accept_queue) { |
d646960f SO |
620 | accept_sk = &lsk->sk; |
621 | lock_sock(accept_sk); | |
622 | ||
58e3dd15 | 623 | nfc_llcp_send_disconnect(lsk); |
d646960f SO |
624 | nfc_llcp_accept_unlink(accept_sk); |
625 | ||
626 | release_sock(accept_sk); | |
d646960f SO |
627 | } |
628 | } | |
629 | ||
cbbf4721 SO |
630 | if (llcp_sock->reserved_ssap < LLCP_SAP_MAX) |
631 | nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap); | |
d646960f | 632 | |
d646960f SO |
633 | release_sock(sk); |
634 | ||
17f7ae16 TE |
635 | /* Keep this sock alive and therefore do not remove it from the sockets |
636 | * list until the DISC PDU has been actually sent. Otherwise we would | |
637 | * reply with DM PDUs before sending the DISC one. | |
638 | */ | |
639 | if (sk->sk_state == LLCP_DISCONNECTING) | |
640 | return err; | |
641 | ||
4463523b TE |
642 | if (sock->type == SOCK_RAW) |
643 | nfc_llcp_sock_unlink(&local->raw_sockets, sk); | |
644 | else | |
645 | nfc_llcp_sock_unlink(&local->sockets, sk); | |
a69f32af | 646 | |
40c75f81 | 647 | out: |
d646960f SO |
648 | sock_orphan(sk); |
649 | sock_put(sk); | |
650 | ||
40c75f81 | 651 | return err; |
d646960f SO |
652 | } |
653 | ||
654 | static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr, | |
427a2eb1 | 655 | int len, int flags) |
d646960f SO |
656 | { |
657 | struct sock *sk = sock->sk; | |
658 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
659 | struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr; | |
660 | struct nfc_dev *dev; | |
661 | struct nfc_llcp_local *local; | |
662 | int ret = 0; | |
663 | ||
664 | pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags); | |
665 | ||
608c4adf | 666 | if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC) |
d646960f | 667 | return -EINVAL; |
d646960f | 668 | |
32418cfe | 669 | if (addr->service_name_len == 0 && addr->dsap == 0) |
d646960f | 670 | return -EINVAL; |
d646960f SO |
671 | |
672 | pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx, | |
427a2eb1 | 673 | addr->target_idx, addr->nfc_protocol); |
d646960f SO |
674 | |
675 | lock_sock(sk); | |
676 | ||
677 | if (sk->sk_state == LLCP_CONNECTED) { | |
678 | ret = -EISCONN; | |
679 | goto error; | |
680 | } | |
681 | ||
682 | dev = nfc_get_device(addr->dev_idx); | |
683 | if (dev == NULL) { | |
684 | ret = -ENODEV; | |
685 | goto error; | |
686 | } | |
687 | ||
688 | local = nfc_llcp_find_local(dev); | |
689 | if (local == NULL) { | |
690 | ret = -ENODEV; | |
691 | goto put_dev; | |
692 | } | |
693 | ||
694 | device_lock(&dev->dev); | |
695 | if (dev->dep_link_up == false) { | |
696 | ret = -ENOLINK; | |
697 | device_unlock(&dev->dev); | |
698 | goto put_dev; | |
699 | } | |
700 | device_unlock(&dev->dev); | |
701 | ||
702 | if (local->rf_mode == NFC_RF_INITIATOR && | |
427a2eb1 | 703 | addr->target_idx != local->target_idx) { |
d646960f SO |
704 | ret = -ENOLINK; |
705 | goto put_dev; | |
706 | } | |
707 | ||
708 | llcp_sock->dev = dev; | |
c7aa1225 | 709 | llcp_sock->local = nfc_llcp_local_get(local); |
d646960f SO |
710 | llcp_sock->ssap = nfc_llcp_get_local_ssap(local); |
711 | if (llcp_sock->ssap == LLCP_SAP_MAX) { | |
712 | ret = -ENOMEM; | |
713 | goto put_dev; | |
714 | } | |
cbbf4721 SO |
715 | |
716 | llcp_sock->reserved_ssap = llcp_sock->ssap; | |
717 | ||
d646960f SO |
718 | if (addr->service_name_len == 0) |
719 | llcp_sock->dsap = addr->dsap; | |
720 | else | |
721 | llcp_sock->dsap = LLCP_SAP_SDP; | |
722 | llcp_sock->nfc_protocol = addr->nfc_protocol; | |
723 | llcp_sock->service_name_len = min_t(unsigned int, | |
427a2eb1 SO |
724 | addr->service_name_len, |
725 | NFC_LLCP_MAX_SERVICE_NAME); | |
d646960f | 726 | llcp_sock->service_name = kmemdup(addr->service_name, |
427a2eb1 SO |
727 | llcp_sock->service_name_len, |
728 | GFP_KERNEL); | |
d646960f | 729 | |
a69f32af | 730 | nfc_llcp_sock_link(&local->connecting_sockets, sk); |
d646960f SO |
731 | |
732 | ret = nfc_llcp_send_connect(llcp_sock); | |
733 | if (ret) | |
a69f32af | 734 | goto sock_unlink; |
d646960f | 735 | |
b4011239 SO |
736 | sk->sk_state = LLCP_CONNECTING; |
737 | ||
ff353d86 SO |
738 | ret = sock_wait_state(sk, LLCP_CONNECTED, |
739 | sock_sndtimeo(sk, flags & O_NONBLOCK)); | |
b4011239 | 740 | if (ret && ret != -EINPROGRESS) |
a69f32af | 741 | goto sock_unlink; |
d646960f SO |
742 | |
743 | release_sock(sk); | |
ff353d86 | 744 | |
b4011239 | 745 | return ret; |
d646960f | 746 | |
a69f32af SO |
747 | sock_unlink: |
748 | nfc_llcp_put_ssap(local, llcp_sock->ssap); | |
749 | ||
750 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
751 | ||
d646960f SO |
752 | put_dev: |
753 | nfc_put_device(dev); | |
754 | ||
755 | error: | |
756 | release_sock(sk); | |
757 | return ret; | |
758 | } | |
759 | ||
1b784140 YX |
760 | static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg, |
761 | size_t len) | |
53a0ac2e SO |
762 | { |
763 | struct sock *sk = sock->sk; | |
764 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
765 | int ret; | |
766 | ||
767 | pr_debug("sock %p sk %p", sock, sk); | |
768 | ||
769 | ret = sock_error(sk); | |
770 | if (ret) | |
771 | return ret; | |
772 | ||
773 | if (msg->msg_flags & MSG_OOB) | |
774 | return -EOPNOTSUPP; | |
775 | ||
776 | lock_sock(sk); | |
777 | ||
b874dec2 | 778 | if (sk->sk_type == SOCK_DGRAM) { |
342dfc30 SH |
779 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr, |
780 | msg->msg_name); | |
b874dec2 SO |
781 | |
782 | if (msg->msg_namelen < sizeof(*addr)) { | |
783 | release_sock(sk); | |
b874dec2 SO |
784 | return -EINVAL; |
785 | } | |
786 | ||
787 | release_sock(sk); | |
788 | ||
789 | return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap, | |
790 | msg, len); | |
791 | } | |
792 | ||
53a0ac2e SO |
793 | if (sk->sk_state != LLCP_CONNECTED) { |
794 | release_sock(sk); | |
795 | return -ENOTCONN; | |
796 | } | |
797 | ||
798 | release_sock(sk); | |
799 | ||
800 | return nfc_llcp_send_i_frame(llcp_sock, msg, len); | |
801 | } | |
802 | ||
1b784140 YX |
803 | static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg, |
804 | size_t len, int flags) | |
d646960f SO |
805 | { |
806 | int noblock = flags & MSG_DONTWAIT; | |
807 | struct sock *sk = sock->sk; | |
808 | unsigned int copied, rlen; | |
809 | struct sk_buff *skb, *cskb; | |
810 | int err = 0; | |
811 | ||
812 | pr_debug("%p %zu\n", sk, len); | |
813 | ||
814 | lock_sock(sk); | |
815 | ||
816 | if (sk->sk_state == LLCP_CLOSED && | |
427a2eb1 | 817 | skb_queue_empty(&sk->sk_receive_queue)) { |
d646960f SO |
818 | release_sock(sk); |
819 | return 0; | |
820 | } | |
821 | ||
822 | release_sock(sk); | |
823 | ||
824 | if (flags & (MSG_OOB)) | |
825 | return -EOPNOTSUPP; | |
826 | ||
827 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
828 | if (!skb) { | |
829 | pr_err("Recv datagram failed state %d %d %d", | |
427a2eb1 | 830 | sk->sk_state, err, sock_error(sk)); |
d646960f SO |
831 | |
832 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
833 | return 0; | |
834 | ||
835 | return err; | |
836 | } | |
837 | ||
427a2eb1 | 838 | rlen = skb->len; /* real length of skb */ |
d646960f SO |
839 | copied = min_t(unsigned int, rlen, len); |
840 | ||
841 | cskb = skb; | |
51f3d02b | 842 | if (skb_copy_datagram_msg(cskb, 0, msg, copied)) { |
d646960f SO |
843 | if (!(flags & MSG_PEEK)) |
844 | skb_queue_head(&sk->sk_receive_queue, skb); | |
845 | return -EFAULT; | |
846 | } | |
847 | ||
2c2d45bd TE |
848 | sock_recv_timestamp(msg, sk, skb); |
849 | ||
31ca61a8 SO |
850 | if (sk->sk_type == SOCK_DGRAM && msg->msg_name) { |
851 | struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb); | |
342dfc30 SH |
852 | DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr, |
853 | msg->msg_name); | |
31ca61a8 | 854 | |
fad2e371 | 855 | msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp); |
31ca61a8 | 856 | |
fad2e371 | 857 | pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap); |
31ca61a8 | 858 | |
d26d6504 | 859 | memset(sockaddr, 0, sizeof(*sockaddr)); |
fad2e371 SO |
860 | sockaddr->sa_family = AF_NFC; |
861 | sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP; | |
862 | sockaddr->dsap = ui_cb->dsap; | |
863 | sockaddr->ssap = ui_cb->ssap; | |
31ca61a8 SO |
864 | } |
865 | ||
d646960f SO |
866 | /* Mark read part of skb as used */ |
867 | if (!(flags & MSG_PEEK)) { | |
868 | ||
869 | /* SOCK_STREAM: re-queue skb if it contains unreceived data */ | |
31ca61a8 SO |
870 | if (sk->sk_type == SOCK_STREAM || |
871 | sk->sk_type == SOCK_DGRAM || | |
872 | sk->sk_type == SOCK_RAW) { | |
d646960f SO |
873 | skb_pull(skb, copied); |
874 | if (skb->len) { | |
875 | skb_queue_head(&sk->sk_receive_queue, skb); | |
876 | goto done; | |
877 | } | |
878 | } | |
879 | ||
880 | kfree_skb(skb); | |
881 | } | |
882 | ||
883 | /* XXX Queue backlogged skbs */ | |
884 | ||
885 | done: | |
886 | /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ | |
887 | if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) | |
888 | copied = rlen; | |
889 | ||
890 | return copied; | |
891 | } | |
892 | ||
893 | static const struct proto_ops llcp_sock_ops = { | |
894 | .family = PF_NFC, | |
895 | .owner = THIS_MODULE, | |
896 | .bind = llcp_sock_bind, | |
897 | .connect = llcp_sock_connect, | |
898 | .release = llcp_sock_release, | |
899 | .socketpair = sock_no_socketpair, | |
900 | .accept = llcp_sock_accept, | |
901 | .getname = llcp_sock_getname, | |
a11e1d43 | 902 | .poll = llcp_sock_poll, |
d646960f SO |
903 | .ioctl = sock_no_ioctl, |
904 | .listen = llcp_sock_listen, | |
905 | .shutdown = sock_no_shutdown, | |
26fd76ca SO |
906 | .setsockopt = nfc_llcp_setsockopt, |
907 | .getsockopt = nfc_llcp_getsockopt, | |
53a0ac2e | 908 | .sendmsg = llcp_sock_sendmsg, |
d646960f SO |
909 | .recvmsg = llcp_sock_recvmsg, |
910 | .mmap = sock_no_mmap, | |
911 | }; | |
912 | ||
4463523b TE |
913 | static const struct proto_ops llcp_rawsock_ops = { |
914 | .family = PF_NFC, | |
915 | .owner = THIS_MODULE, | |
916 | .bind = llcp_raw_sock_bind, | |
917 | .connect = sock_no_connect, | |
918 | .release = llcp_sock_release, | |
919 | .socketpair = sock_no_socketpair, | |
920 | .accept = sock_no_accept, | |
921 | .getname = llcp_sock_getname, | |
a11e1d43 | 922 | .poll = llcp_sock_poll, |
4463523b TE |
923 | .ioctl = sock_no_ioctl, |
924 | .listen = sock_no_listen, | |
925 | .shutdown = sock_no_shutdown, | |
926 | .setsockopt = sock_no_setsockopt, | |
927 | .getsockopt = sock_no_getsockopt, | |
928 | .sendmsg = sock_no_sendmsg, | |
929 | .recvmsg = llcp_sock_recvmsg, | |
930 | .mmap = sock_no_mmap, | |
931 | }; | |
932 | ||
d646960f SO |
933 | static void llcp_sock_destruct(struct sock *sk) |
934 | { | |
935 | struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk); | |
936 | ||
937 | pr_debug("%p\n", sk); | |
938 | ||
939 | if (sk->sk_state == LLCP_CONNECTED) | |
940 | nfc_put_device(llcp_sock->dev); | |
941 | ||
942 | skb_queue_purge(&sk->sk_receive_queue); | |
943 | ||
944 | nfc_llcp_sock_free(llcp_sock); | |
945 | ||
946 | if (!sock_flag(sk, SOCK_DEAD)) { | |
947 | pr_err("Freeing alive NFC LLCP socket %p\n", sk); | |
948 | return; | |
949 | } | |
950 | } | |
951 | ||
11aa9c28 | 952 | struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern) |
d646960f SO |
953 | { |
954 | struct sock *sk; | |
955 | struct nfc_llcp_sock *llcp_sock; | |
956 | ||
11aa9c28 | 957 | sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern); |
d646960f SO |
958 | if (!sk) |
959 | return NULL; | |
960 | ||
961 | llcp_sock = nfc_llcp_sock(sk); | |
962 | ||
963 | sock_init_data(sock, sk); | |
964 | sk->sk_state = LLCP_CLOSED; | |
965 | sk->sk_protocol = NFC_SOCKPROTO_LLCP; | |
966 | sk->sk_type = type; | |
967 | sk->sk_destruct = llcp_sock_destruct; | |
968 | ||
969 | llcp_sock->ssap = 0; | |
970 | llcp_sock->dsap = LLCP_SAP_SDP; | |
06d44f80 | 971 | llcp_sock->rw = LLCP_MAX_RW + 1; |
5eef6669 | 972 | llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1); |
d646960f SO |
973 | llcp_sock->send_n = llcp_sock->send_ack_n = 0; |
974 | llcp_sock->recv_n = llcp_sock->recv_ack_n = 0; | |
975 | llcp_sock->remote_ready = 1; | |
cbbf4721 | 976 | llcp_sock->reserved_ssap = LLCP_SAP_MAX; |
abd18d43 | 977 | nfc_llcp_socket_remote_param_init(llcp_sock); |
d646960f SO |
978 | skb_queue_head_init(&llcp_sock->tx_queue); |
979 | skb_queue_head_init(&llcp_sock->tx_pending_queue); | |
d646960f SO |
980 | INIT_LIST_HEAD(&llcp_sock->accept_queue); |
981 | ||
982 | if (sock != NULL) | |
983 | sock->state = SS_UNCONNECTED; | |
984 | ||
985 | return sk; | |
986 | } | |
987 | ||
988 | void nfc_llcp_sock_free(struct nfc_llcp_sock *sock) | |
989 | { | |
990 | kfree(sock->service_name); | |
991 | ||
992 | skb_queue_purge(&sock->tx_queue); | |
993 | skb_queue_purge(&sock->tx_pending_queue); | |
d646960f SO |
994 | |
995 | list_del_init(&sock->accept_queue); | |
40c75f81 | 996 | |
d646960f | 997 | sock->parent = NULL; |
c7aa1225 SO |
998 | |
999 | nfc_llcp_local_put(sock->local); | |
d646960f SO |
1000 | } |
1001 | ||
1002 | static int llcp_sock_create(struct net *net, struct socket *sock, | |
11aa9c28 | 1003 | const struct nfc_protocol *nfc_proto, int kern) |
d646960f SO |
1004 | { |
1005 | struct sock *sk; | |
1006 | ||
1007 | pr_debug("%p\n", sock); | |
1008 | ||
4463523b TE |
1009 | if (sock->type != SOCK_STREAM && |
1010 | sock->type != SOCK_DGRAM && | |
1011 | sock->type != SOCK_RAW) | |
d646960f SO |
1012 | return -ESOCKTNOSUPPORT; |
1013 | ||
4463523b TE |
1014 | if (sock->type == SOCK_RAW) |
1015 | sock->ops = &llcp_rawsock_ops; | |
1016 | else | |
1017 | sock->ops = &llcp_sock_ops; | |
d646960f | 1018 | |
11aa9c28 | 1019 | sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern); |
d646960f SO |
1020 | if (sk == NULL) |
1021 | return -ENOMEM; | |
1022 | ||
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | static const struct nfc_protocol llcp_nfc_proto = { | |
1027 | .id = NFC_SOCKPROTO_LLCP, | |
1028 | .proto = &llcp_sock_proto, | |
1029 | .owner = THIS_MODULE, | |
1030 | .create = llcp_sock_create | |
1031 | }; | |
1032 | ||
1033 | int __init nfc_llcp_sock_init(void) | |
1034 | { | |
1035 | return nfc_proto_register(&llcp_nfc_proto); | |
1036 | } | |
1037 | ||
1038 | void nfc_llcp_sock_exit(void) | |
1039 | { | |
1040 | nfc_proto_unregister(&llcp_nfc_proto); | |
1041 | } |