xref: /openbmc/linux/net/nfc/llcp_sock.c (revision f0702555)
1 /*
2  * Copyright (C) 2011  Intel Corporation. All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
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 
25 #include "nfc.h"
26 #include "llcp.h"
27 
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 
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 
79 	if (!addr || addr->sa_family != AF_NFC)
80 		return -EINVAL;
81 
82 	pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
83 
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;
112 	llcp_sock->local = nfc_llcp_local_get(local);
113 	llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
114 	llcp_sock->service_name_len = min_t(unsigned int,
115 					    llcp_addr.service_name_len,
116 					    NFC_LLCP_MAX_SERVICE_NAME);
117 	llcp_sock->service_name = kmemdup(llcp_addr.service_name,
118 					  llcp_sock->service_name_len,
119 					  GFP_KERNEL);
120 
121 	llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
122 	if (llcp_sock->ssap == LLCP_SAP_MAX) {
123 		ret = -EADDRINUSE;
124 		goto put_dev;
125 	}
126 
127 	llcp_sock->reserved_ssap = llcp_sock->ssap;
128 
129 	nfc_llcp_sock_link(&local->sockets, sk);
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 
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 
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 
206 	if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
207 	    sk->sk_state != LLCP_BOUND) {
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 
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 
280 		llcp_sock->miux = cpu_to_be16((u16) opt);
281 
282 		break;
283 
284 	default:
285 		err = -ENOPROTOOPT;
286 		break;
287 	}
288 
289 	release_sock(sk);
290 
291 	pr_debug("%p rw %d miux %d\n", llcp_sock,
292 		 llcp_sock->rw, llcp_sock->miux);
293 
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 {
300 	struct nfc_llcp_local *local;
301 	struct sock *sk = sock->sk;
302 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
303 	int len, err = 0;
304 	u16 miux, remote_miu;
305 	u8 rw;
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 
315 	local = llcp_sock->local;
316 	if (!local)
317 		return -ENODEV;
318 
319 	len = min_t(u32, len, sizeof(u32));
320 
321 	lock_sock(sk);
322 
323 	switch (optname) {
324 	case NFC_LLCP_RW:
325 		rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
326 		if (put_user(rw, (u32 __user *) optval))
327 			err = -EFAULT;
328 
329 		break;
330 
331 	case NFC_LLCP_MIUX:
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))
336 			err = -EFAULT;
337 
338 		break;
339 
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))
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 
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,
396 		      &llcp_sock_parent->accept_queue);
397 	llcp_sock->parent = parent;
398 	sk_acceptq_added(parent);
399 }
400 
401 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
402 				     struct socket *newsock)
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,
410 				 accept_queue) {
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) {
421 			list_del_init(&lsk->accept_queue);
422 			sock_put(sk);
423 
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 
431 			sk_acceptq_removed(parent);
432 
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,
443 			    int flags)
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 
496 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
497 			     int *len, int peer)
498 {
499 	struct sock *sk = sock->sk;
500 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
501 	DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
502 
503 	if (llcp_sock == NULL || llcp_sock->dev == NULL)
504 		return -EBADFD;
505 
506 	pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
507 		 llcp_sock->dsap, llcp_sock->ssap);
508 
509 	memset(llcp_addr, 0, sizeof(*llcp_addr));
510 	*len = sizeof(struct sockaddr_nfc_llcp);
511 
512 	lock_sock(sk);
513 	if (!llcp_sock->dev) {
514 		release_sock(sk);
515 		return -EBADFD;
516 	}
517 	llcp_addr->sa_family = AF_NFC;
518 	llcp_addr->dev_idx = llcp_sock->dev->idx;
519 	llcp_addr->target_idx = llcp_sock->target_idx;
520 	llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
521 	llcp_addr->dsap = llcp_sock->dsap;
522 	llcp_addr->ssap = llcp_sock->ssap;
523 	llcp_addr->service_name_len = llcp_sock->service_name_len;
524 	memcpy(llcp_addr->service_name, llcp_sock->service_name,
525 	       llcp_addr->service_name_len);
526 	release_sock(sk);
527 
528 	return 0;
529 }
530 
531 static inline unsigned int llcp_accept_poll(struct sock *parent)
532 {
533 	struct nfc_llcp_sock *llcp_sock, *parent_sock;
534 	struct sock *sk;
535 
536 	parent_sock = nfc_llcp_sock(parent);
537 
538 	list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
539 			    accept_queue) {
540 		sk = &llcp_sock->sk;
541 
542 		if (sk->sk_state == LLCP_CONNECTED)
543 			return POLLIN | POLLRDNORM;
544 	}
545 
546 	return 0;
547 }
548 
549 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
550 				   poll_table *wait)
551 {
552 	struct sock *sk = sock->sk;
553 	unsigned int mask = 0;
554 
555 	pr_debug("%p\n", sk);
556 
557 	sock_poll_wait(file, sk_sleep(sk), wait);
558 
559 	if (sk->sk_state == LLCP_LISTEN)
560 		return llcp_accept_poll(sk);
561 
562 	if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
563 		mask |= POLLERR |
564 			(sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
565 
566 	if (!skb_queue_empty(&sk->sk_receive_queue))
567 		mask |= POLLIN | POLLRDNORM;
568 
569 	if (sk->sk_state == LLCP_CLOSED)
570 		mask |= POLLHUP;
571 
572 	if (sk->sk_shutdown & RCV_SHUTDOWN)
573 		mask |= POLLRDHUP | POLLIN | POLLRDNORM;
574 
575 	if (sk->sk_shutdown == SHUTDOWN_MASK)
576 		mask |= POLLHUP;
577 
578 	if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
579 		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
580 	else
581 		sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
582 
583 	pr_debug("mask 0x%x\n", mask);
584 
585 	return mask;
586 }
587 
588 static int llcp_sock_release(struct socket *sock)
589 {
590 	struct sock *sk = sock->sk;
591 	struct nfc_llcp_local *local;
592 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
593 	int err = 0;
594 
595 	if (!sk)
596 		return 0;
597 
598 	pr_debug("%p\n", sk);
599 
600 	local = llcp_sock->local;
601 	if (local == NULL) {
602 		err = -ENODEV;
603 		goto out;
604 	}
605 
606 	lock_sock(sk);
607 
608 	/* Send a DISC */
609 	if (sk->sk_state == LLCP_CONNECTED)
610 		nfc_llcp_send_disconnect(llcp_sock);
611 
612 	if (sk->sk_state == LLCP_LISTEN) {
613 		struct nfc_llcp_sock *lsk, *n;
614 		struct sock *accept_sk;
615 
616 		list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
617 					 accept_queue) {
618 			accept_sk = &lsk->sk;
619 			lock_sock(accept_sk);
620 
621 			nfc_llcp_send_disconnect(lsk);
622 			nfc_llcp_accept_unlink(accept_sk);
623 
624 			release_sock(accept_sk);
625 		}
626 	}
627 
628 	if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
629 		nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
630 
631 	release_sock(sk);
632 
633 	/* Keep this sock alive and therefore do not remove it from the sockets
634 	 * list until the DISC PDU has been actually sent. Otherwise we would
635 	 * reply with DM PDUs before sending the DISC one.
636 	 */
637 	if (sk->sk_state == LLCP_DISCONNECTING)
638 		return err;
639 
640 	if (sock->type == SOCK_RAW)
641 		nfc_llcp_sock_unlink(&local->raw_sockets, sk);
642 	else
643 		nfc_llcp_sock_unlink(&local->sockets, sk);
644 
645 out:
646 	sock_orphan(sk);
647 	sock_put(sk);
648 
649 	return err;
650 }
651 
652 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
653 			     int len, int flags)
654 {
655 	struct sock *sk = sock->sk;
656 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
657 	struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
658 	struct nfc_dev *dev;
659 	struct nfc_llcp_local *local;
660 	int ret = 0;
661 
662 	pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
663 
664 	if (!addr || len < sizeof(struct sockaddr_nfc) ||
665 	    addr->sa_family != AF_NFC)
666 		return -EINVAL;
667 
668 	if (addr->service_name_len == 0 && addr->dsap == 0)
669 		return -EINVAL;
670 
671 	pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
672 		 addr->target_idx, addr->nfc_protocol);
673 
674 	lock_sock(sk);
675 
676 	if (sk->sk_state == LLCP_CONNECTED) {
677 		ret = -EISCONN;
678 		goto error;
679 	}
680 
681 	dev = nfc_get_device(addr->dev_idx);
682 	if (dev == NULL) {
683 		ret = -ENODEV;
684 		goto error;
685 	}
686 
687 	local = nfc_llcp_find_local(dev);
688 	if (local == NULL) {
689 		ret = -ENODEV;
690 		goto put_dev;
691 	}
692 
693 	device_lock(&dev->dev);
694 	if (dev->dep_link_up == false) {
695 		ret = -ENOLINK;
696 		device_unlock(&dev->dev);
697 		goto put_dev;
698 	}
699 	device_unlock(&dev->dev);
700 
701 	if (local->rf_mode == NFC_RF_INITIATOR &&
702 	    addr->target_idx != local->target_idx) {
703 		ret = -ENOLINK;
704 		goto put_dev;
705 	}
706 
707 	llcp_sock->dev = dev;
708 	llcp_sock->local = nfc_llcp_local_get(local);
709 	llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
710 	if (llcp_sock->ssap == LLCP_SAP_MAX) {
711 		ret = -ENOMEM;
712 		goto put_dev;
713 	}
714 
715 	llcp_sock->reserved_ssap = llcp_sock->ssap;
716 
717 	if (addr->service_name_len == 0)
718 		llcp_sock->dsap = addr->dsap;
719 	else
720 		llcp_sock->dsap = LLCP_SAP_SDP;
721 	llcp_sock->nfc_protocol = addr->nfc_protocol;
722 	llcp_sock->service_name_len = min_t(unsigned int,
723 					    addr->service_name_len,
724 					    NFC_LLCP_MAX_SERVICE_NAME);
725 	llcp_sock->service_name = kmemdup(addr->service_name,
726 					  llcp_sock->service_name_len,
727 					  GFP_KERNEL);
728 
729 	nfc_llcp_sock_link(&local->connecting_sockets, sk);
730 
731 	ret = nfc_llcp_send_connect(llcp_sock);
732 	if (ret)
733 		goto sock_unlink;
734 
735 	sk->sk_state = LLCP_CONNECTING;
736 
737 	ret = sock_wait_state(sk, LLCP_CONNECTED,
738 			      sock_sndtimeo(sk, flags & O_NONBLOCK));
739 	if (ret && ret != -EINPROGRESS)
740 		goto sock_unlink;
741 
742 	release_sock(sk);
743 
744 	return ret;
745 
746 sock_unlink:
747 	nfc_llcp_put_ssap(local, llcp_sock->ssap);
748 
749 	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
750 
751 put_dev:
752 	nfc_put_device(dev);
753 
754 error:
755 	release_sock(sk);
756 	return ret;
757 }
758 
759 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
760 			     size_t len)
761 {
762 	struct sock *sk = sock->sk;
763 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
764 	int ret;
765 
766 	pr_debug("sock %p sk %p", sock, sk);
767 
768 	ret = sock_error(sk);
769 	if (ret)
770 		return ret;
771 
772 	if (msg->msg_flags & MSG_OOB)
773 		return -EOPNOTSUPP;
774 
775 	lock_sock(sk);
776 
777 	if (sk->sk_type == SOCK_DGRAM) {
778 		DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
779 				 msg->msg_name);
780 
781 		if (msg->msg_namelen < sizeof(*addr)) {
782 			release_sock(sk);
783 			return -EINVAL;
784 		}
785 
786 		release_sock(sk);
787 
788 		return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
789 					      msg, len);
790 	}
791 
792 	if (sk->sk_state != LLCP_CONNECTED) {
793 		release_sock(sk);
794 		return -ENOTCONN;
795 	}
796 
797 	release_sock(sk);
798 
799 	return nfc_llcp_send_i_frame(llcp_sock, msg, len);
800 }
801 
802 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
803 			     size_t len, int flags)
804 {
805 	int noblock = flags & MSG_DONTWAIT;
806 	struct sock *sk = sock->sk;
807 	unsigned int copied, rlen;
808 	struct sk_buff *skb, *cskb;
809 	int err = 0;
810 
811 	pr_debug("%p %zu\n", sk, len);
812 
813 	lock_sock(sk);
814 
815 	if (sk->sk_state == LLCP_CLOSED &&
816 	    skb_queue_empty(&sk->sk_receive_queue)) {
817 		release_sock(sk);
818 		return 0;
819 	}
820 
821 	release_sock(sk);
822 
823 	if (flags & (MSG_OOB))
824 		return -EOPNOTSUPP;
825 
826 	skb = skb_recv_datagram(sk, flags, noblock, &err);
827 	if (!skb) {
828 		pr_err("Recv datagram failed state %d %d %d",
829 		       sk->sk_state, err, sock_error(sk));
830 
831 		if (sk->sk_shutdown & RCV_SHUTDOWN)
832 			return 0;
833 
834 		return err;
835 	}
836 
837 	rlen = skb->len;		/* real length of skb */
838 	copied = min_t(unsigned int, rlen, len);
839 
840 	cskb = skb;
841 	if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
842 		if (!(flags & MSG_PEEK))
843 			skb_queue_head(&sk->sk_receive_queue, skb);
844 		return -EFAULT;
845 	}
846 
847 	sock_recv_timestamp(msg, sk, skb);
848 
849 	if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
850 		struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
851 		DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
852 				 msg->msg_name);
853 
854 		msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
855 
856 		pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
857 
858 		memset(sockaddr, 0, sizeof(*sockaddr));
859 		sockaddr->sa_family = AF_NFC;
860 		sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
861 		sockaddr->dsap = ui_cb->dsap;
862 		sockaddr->ssap = ui_cb->ssap;
863 	}
864 
865 	/* Mark read part of skb as used */
866 	if (!(flags & MSG_PEEK)) {
867 
868 		/* SOCK_STREAM: re-queue skb if it contains unreceived data */
869 		if (sk->sk_type == SOCK_STREAM ||
870 		    sk->sk_type == SOCK_DGRAM ||
871 		    sk->sk_type == SOCK_RAW) {
872 			skb_pull(skb, copied);
873 			if (skb->len) {
874 				skb_queue_head(&sk->sk_receive_queue, skb);
875 				goto done;
876 			}
877 		}
878 
879 		kfree_skb(skb);
880 	}
881 
882 	/* XXX Queue backlogged skbs */
883 
884 done:
885 	/* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
886 	if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
887 		copied = rlen;
888 
889 	return copied;
890 }
891 
892 static const struct proto_ops llcp_sock_ops = {
893 	.family         = PF_NFC,
894 	.owner          = THIS_MODULE,
895 	.bind           = llcp_sock_bind,
896 	.connect        = llcp_sock_connect,
897 	.release        = llcp_sock_release,
898 	.socketpair     = sock_no_socketpair,
899 	.accept         = llcp_sock_accept,
900 	.getname        = llcp_sock_getname,
901 	.poll           = llcp_sock_poll,
902 	.ioctl          = sock_no_ioctl,
903 	.listen         = llcp_sock_listen,
904 	.shutdown       = sock_no_shutdown,
905 	.setsockopt     = nfc_llcp_setsockopt,
906 	.getsockopt     = nfc_llcp_getsockopt,
907 	.sendmsg        = llcp_sock_sendmsg,
908 	.recvmsg        = llcp_sock_recvmsg,
909 	.mmap           = sock_no_mmap,
910 };
911 
912 static const struct proto_ops llcp_rawsock_ops = {
913 	.family         = PF_NFC,
914 	.owner          = THIS_MODULE,
915 	.bind           = llcp_raw_sock_bind,
916 	.connect        = sock_no_connect,
917 	.release        = llcp_sock_release,
918 	.socketpair     = sock_no_socketpair,
919 	.accept         = sock_no_accept,
920 	.getname        = llcp_sock_getname,
921 	.poll           = llcp_sock_poll,
922 	.ioctl          = sock_no_ioctl,
923 	.listen         = sock_no_listen,
924 	.shutdown       = sock_no_shutdown,
925 	.setsockopt     = sock_no_setsockopt,
926 	.getsockopt     = sock_no_getsockopt,
927 	.sendmsg        = sock_no_sendmsg,
928 	.recvmsg        = llcp_sock_recvmsg,
929 	.mmap           = sock_no_mmap,
930 };
931 
932 static void llcp_sock_destruct(struct sock *sk)
933 {
934 	struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
935 
936 	pr_debug("%p\n", sk);
937 
938 	if (sk->sk_state == LLCP_CONNECTED)
939 		nfc_put_device(llcp_sock->dev);
940 
941 	skb_queue_purge(&sk->sk_receive_queue);
942 
943 	nfc_llcp_sock_free(llcp_sock);
944 
945 	if (!sock_flag(sk, SOCK_DEAD)) {
946 		pr_err("Freeing alive NFC LLCP socket %p\n", sk);
947 		return;
948 	}
949 }
950 
951 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
952 {
953 	struct sock *sk;
954 	struct nfc_llcp_sock *llcp_sock;
955 
956 	sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
957 	if (!sk)
958 		return NULL;
959 
960 	llcp_sock = nfc_llcp_sock(sk);
961 
962 	sock_init_data(sock, sk);
963 	sk->sk_state = LLCP_CLOSED;
964 	sk->sk_protocol = NFC_SOCKPROTO_LLCP;
965 	sk->sk_type = type;
966 	sk->sk_destruct = llcp_sock_destruct;
967 
968 	llcp_sock->ssap = 0;
969 	llcp_sock->dsap = LLCP_SAP_SDP;
970 	llcp_sock->rw = LLCP_MAX_RW + 1;
971 	llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
972 	llcp_sock->send_n = llcp_sock->send_ack_n = 0;
973 	llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
974 	llcp_sock->remote_ready = 1;
975 	llcp_sock->reserved_ssap = LLCP_SAP_MAX;
976 	nfc_llcp_socket_remote_param_init(llcp_sock);
977 	skb_queue_head_init(&llcp_sock->tx_queue);
978 	skb_queue_head_init(&llcp_sock->tx_pending_queue);
979 	INIT_LIST_HEAD(&llcp_sock->accept_queue);
980 
981 	if (sock != NULL)
982 		sock->state = SS_UNCONNECTED;
983 
984 	return sk;
985 }
986 
987 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
988 {
989 	kfree(sock->service_name);
990 
991 	skb_queue_purge(&sock->tx_queue);
992 	skb_queue_purge(&sock->tx_pending_queue);
993 
994 	list_del_init(&sock->accept_queue);
995 
996 	sock->parent = NULL;
997 
998 	nfc_llcp_local_put(sock->local);
999 }
1000 
1001 static int llcp_sock_create(struct net *net, struct socket *sock,
1002 			    const struct nfc_protocol *nfc_proto, int kern)
1003 {
1004 	struct sock *sk;
1005 
1006 	pr_debug("%p\n", sock);
1007 
1008 	if (sock->type != SOCK_STREAM &&
1009 	    sock->type != SOCK_DGRAM &&
1010 	    sock->type != SOCK_RAW)
1011 		return -ESOCKTNOSUPPORT;
1012 
1013 	if (sock->type == SOCK_RAW)
1014 		sock->ops = &llcp_rawsock_ops;
1015 	else
1016 		sock->ops = &llcp_sock_ops;
1017 
1018 	sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1019 	if (sk == NULL)
1020 		return -ENOMEM;
1021 
1022 	return 0;
1023 }
1024 
1025 static const struct nfc_protocol llcp_nfc_proto = {
1026 	.id	  = NFC_SOCKPROTO_LLCP,
1027 	.proto    = &llcp_sock_proto,
1028 	.owner    = THIS_MODULE,
1029 	.create   = llcp_sock_create
1030 };
1031 
1032 int __init nfc_llcp_sock_init(void)
1033 {
1034 	return nfc_proto_register(&llcp_nfc_proto);
1035 }
1036 
1037 void nfc_llcp_sock_exit(void)
1038 {
1039 	nfc_proto_unregister(&llcp_nfc_proto);
1040 }
1041