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
sock_wait_state(struct sock * sk,int state,unsigned long timeo)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
llcp_sock_bind(struct socket * sock,struct sockaddr * addr,int alen)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 || alen < offsetofend(struct sockaddr, sa_family) ||
80 addr->sa_family != AF_NFC)
81 return -EINVAL;
82
83 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
84
85 memset(&llcp_addr, 0, sizeof(llcp_addr));
86 len = min_t(unsigned int, sizeof(llcp_addr), alen);
87 memcpy(&llcp_addr, addr, len);
88
89 /* This is going to be a listening socket, dsap must be 0 */
90 if (llcp_addr.dsap != 0)
91 return -EINVAL;
92
93 lock_sock(sk);
94
95 if (sk->sk_state != LLCP_CLOSED) {
96 ret = -EBADFD;
97 goto error;
98 }
99
100 dev = nfc_get_device(llcp_addr.dev_idx);
101 if (dev == NULL) {
102 ret = -ENODEV;
103 goto error;
104 }
105
106 local = nfc_llcp_find_local(dev);
107 if (local == NULL) {
108 ret = -ENODEV;
109 goto put_dev;
110 }
111
112 llcp_sock->dev = dev;
113 llcp_sock->local = nfc_llcp_local_get(local);
114 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
115 llcp_sock->service_name_len = min_t(unsigned int,
116 llcp_addr.service_name_len,
117 NFC_LLCP_MAX_SERVICE_NAME);
118 llcp_sock->service_name = kmemdup(llcp_addr.service_name,
119 llcp_sock->service_name_len,
120 GFP_KERNEL);
121
122 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
123 if (llcp_sock->ssap == LLCP_SAP_MAX) {
124 ret = -EADDRINUSE;
125 goto put_dev;
126 }
127
128 llcp_sock->reserved_ssap = llcp_sock->ssap;
129
130 nfc_llcp_sock_link(&local->sockets, sk);
131
132 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
133
134 sk->sk_state = LLCP_BOUND;
135
136 put_dev:
137 nfc_put_device(dev);
138
139 error:
140 release_sock(sk);
141 return ret;
142 }
143
llcp_raw_sock_bind(struct socket * sock,struct sockaddr * addr,int alen)144 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
145 int alen)
146 {
147 struct sock *sk = sock->sk;
148 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
149 struct nfc_llcp_local *local;
150 struct nfc_dev *dev;
151 struct sockaddr_nfc_llcp llcp_addr;
152 int len, ret = 0;
153
154 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
155 addr->sa_family != AF_NFC)
156 return -EINVAL;
157
158 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
159
160 memset(&llcp_addr, 0, sizeof(llcp_addr));
161 len = min_t(unsigned int, sizeof(llcp_addr), alen);
162 memcpy(&llcp_addr, addr, len);
163
164 lock_sock(sk);
165
166 if (sk->sk_state != LLCP_CLOSED) {
167 ret = -EBADFD;
168 goto error;
169 }
170
171 dev = nfc_get_device(llcp_addr.dev_idx);
172 if (dev == NULL) {
173 ret = -ENODEV;
174 goto error;
175 }
176
177 local = nfc_llcp_find_local(dev);
178 if (local == NULL) {
179 ret = -ENODEV;
180 goto put_dev;
181 }
182
183 llcp_sock->dev = dev;
184 llcp_sock->local = nfc_llcp_local_get(local);
185 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
186
187 nfc_llcp_sock_link(&local->raw_sockets, sk);
188
189 sk->sk_state = LLCP_BOUND;
190
191 put_dev:
192 nfc_put_device(dev);
193
194 error:
195 release_sock(sk);
196 return ret;
197 }
198
llcp_sock_listen(struct socket * sock,int backlog)199 static int llcp_sock_listen(struct socket *sock, int backlog)
200 {
201 struct sock *sk = sock->sk;
202 int ret = 0;
203
204 pr_debug("sk %p backlog %d\n", sk, backlog);
205
206 lock_sock(sk);
207
208 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
209 sk->sk_state != LLCP_BOUND) {
210 ret = -EBADFD;
211 goto error;
212 }
213
214 sk->sk_max_ack_backlog = backlog;
215 sk->sk_ack_backlog = 0;
216
217 pr_debug("Socket listening\n");
218 sk->sk_state = LLCP_LISTEN;
219
220 error:
221 release_sock(sk);
222
223 return ret;
224 }
225
nfc_llcp_setsockopt(struct socket * sock,int level,int optname,char __user * optval,unsigned int optlen)226 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
227 char __user *optval, unsigned int optlen)
228 {
229 struct sock *sk = sock->sk;
230 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
231 u32 opt;
232 int err = 0;
233
234 pr_debug("%p optname %d\n", sk, optname);
235
236 if (level != SOL_NFC)
237 return -ENOPROTOOPT;
238
239 lock_sock(sk);
240
241 switch (optname) {
242 case NFC_LLCP_RW:
243 if (sk->sk_state == LLCP_CONNECTED ||
244 sk->sk_state == LLCP_BOUND ||
245 sk->sk_state == LLCP_LISTEN) {
246 err = -EINVAL;
247 break;
248 }
249
250 if (get_user(opt, (u32 __user *) optval)) {
251 err = -EFAULT;
252 break;
253 }
254
255 if (opt > LLCP_MAX_RW) {
256 err = -EINVAL;
257 break;
258 }
259
260 llcp_sock->rw = (u8) opt;
261
262 break;
263
264 case NFC_LLCP_MIUX:
265 if (sk->sk_state == LLCP_CONNECTED ||
266 sk->sk_state == LLCP_BOUND ||
267 sk->sk_state == LLCP_LISTEN) {
268 err = -EINVAL;
269 break;
270 }
271
272 if (get_user(opt, (u32 __user *) optval)) {
273 err = -EFAULT;
274 break;
275 }
276
277 if (opt > LLCP_MAX_MIUX) {
278 err = -EINVAL;
279 break;
280 }
281
282 llcp_sock->miux = cpu_to_be16((u16) opt);
283
284 break;
285
286 default:
287 err = -ENOPROTOOPT;
288 break;
289 }
290
291 release_sock(sk);
292
293 pr_debug("%p rw %d miux %d\n", llcp_sock,
294 llcp_sock->rw, llcp_sock->miux);
295
296 return err;
297 }
298
nfc_llcp_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)299 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
300 char __user *optval, int __user *optlen)
301 {
302 struct nfc_llcp_local *local;
303 struct sock *sk = sock->sk;
304 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
305 int len, err = 0;
306 u16 miux, remote_miu;
307 u8 rw;
308
309 pr_debug("%p optname %d\n", sk, optname);
310
311 if (level != SOL_NFC)
312 return -ENOPROTOOPT;
313
314 if (get_user(len, optlen))
315 return -EFAULT;
316
317 local = llcp_sock->local;
318 if (!local)
319 return -ENODEV;
320
321 len = min_t(u32, len, sizeof(u32));
322
323 lock_sock(sk);
324
325 switch (optname) {
326 case NFC_LLCP_RW:
327 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
328 if (put_user(rw, (u32 __user *) optval))
329 err = -EFAULT;
330
331 break;
332
333 case NFC_LLCP_MIUX:
334 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
335 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
336
337 if (put_user(miux, (u32 __user *) optval))
338 err = -EFAULT;
339
340 break;
341
342 case NFC_LLCP_REMOTE_MIU:
343 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
344 local->remote_miu : llcp_sock->remote_miu;
345
346 if (put_user(remote_miu, (u32 __user *) optval))
347 err = -EFAULT;
348
349 break;
350
351 case NFC_LLCP_REMOTE_LTO:
352 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
353 err = -EFAULT;
354
355 break;
356
357 case NFC_LLCP_REMOTE_RW:
358 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
359 err = -EFAULT;
360
361 break;
362
363 default:
364 err = -ENOPROTOOPT;
365 break;
366 }
367
368 release_sock(sk);
369
370 if (put_user(len, optlen))
371 return -EFAULT;
372
373 return err;
374 }
375
nfc_llcp_accept_unlink(struct sock * sk)376 void nfc_llcp_accept_unlink(struct sock *sk)
377 {
378 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
379
380 pr_debug("state %d\n", sk->sk_state);
381
382 list_del_init(&llcp_sock->accept_queue);
383 sk_acceptq_removed(llcp_sock->parent);
384 llcp_sock->parent = NULL;
385
386 sock_put(sk);
387 }
388
nfc_llcp_accept_enqueue(struct sock * parent,struct sock * sk)389 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
390 {
391 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
392 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
393
394 /* Lock will be free from unlink */
395 sock_hold(sk);
396
397 list_add_tail(&llcp_sock->accept_queue,
398 &llcp_sock_parent->accept_queue);
399 llcp_sock->parent = parent;
400 sk_acceptq_added(parent);
401 }
402
nfc_llcp_accept_dequeue(struct sock * parent,struct socket * newsock)403 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
404 struct socket *newsock)
405 {
406 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
407 struct sock *sk;
408
409 llcp_parent = nfc_llcp_sock(parent);
410
411 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
412 accept_queue) {
413 sk = &lsk->sk;
414 lock_sock(sk);
415
416 if (sk->sk_state == LLCP_CLOSED) {
417 release_sock(sk);
418 nfc_llcp_accept_unlink(sk);
419 continue;
420 }
421
422 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
423 list_del_init(&lsk->accept_queue);
424 sock_put(sk);
425
426 if (newsock)
427 sock_graft(sk, newsock);
428
429 release_sock(sk);
430
431 pr_debug("Returning sk state %d\n", sk->sk_state);
432
433 sk_acceptq_removed(parent);
434
435 return sk;
436 }
437
438 release_sock(sk);
439 }
440
441 return NULL;
442 }
443
llcp_sock_accept(struct socket * sock,struct socket * newsock,int flags)444 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
445 int flags)
446 {
447 DECLARE_WAITQUEUE(wait, current);
448 struct sock *sk = sock->sk, *new_sk;
449 long timeo;
450 int ret = 0;
451
452 pr_debug("parent %p\n", sk);
453
454 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
455
456 if (sk->sk_state != LLCP_LISTEN) {
457 ret = -EBADFD;
458 goto error;
459 }
460
461 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
462
463 /* Wait for an incoming connection. */
464 add_wait_queue_exclusive(sk_sleep(sk), &wait);
465 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
466 set_current_state(TASK_INTERRUPTIBLE);
467
468 if (!timeo) {
469 ret = -EAGAIN;
470 break;
471 }
472
473 if (signal_pending(current)) {
474 ret = sock_intr_errno(timeo);
475 break;
476 }
477
478 release_sock(sk);
479 timeo = schedule_timeout(timeo);
480 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
481 }
482 __set_current_state(TASK_RUNNING);
483 remove_wait_queue(sk_sleep(sk), &wait);
484
485 if (ret)
486 goto error;
487
488 newsock->state = SS_CONNECTED;
489
490 pr_debug("new socket %p\n", new_sk);
491
492 error:
493 release_sock(sk);
494
495 return ret;
496 }
497
llcp_sock_getname(struct socket * sock,struct sockaddr * uaddr,int * len,int peer)498 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
499 int *len, int peer)
500 {
501 struct sock *sk = sock->sk;
502 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
503 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
504
505 if (llcp_sock == NULL || llcp_sock->dev == NULL)
506 return -EBADFD;
507
508 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
509 llcp_sock->dsap, llcp_sock->ssap);
510
511 memset(llcp_addr, 0, sizeof(*llcp_addr));
512 *len = sizeof(struct sockaddr_nfc_llcp);
513
514 llcp_addr->sa_family = AF_NFC;
515 llcp_addr->dev_idx = llcp_sock->dev->idx;
516 llcp_addr->target_idx = llcp_sock->target_idx;
517 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
518 llcp_addr->dsap = llcp_sock->dsap;
519 llcp_addr->ssap = llcp_sock->ssap;
520 llcp_addr->service_name_len = llcp_sock->service_name_len;
521 memcpy(llcp_addr->service_name, llcp_sock->service_name,
522 llcp_addr->service_name_len);
523
524 return 0;
525 }
526
llcp_accept_poll(struct sock * parent)527 static inline unsigned int llcp_accept_poll(struct sock *parent)
528 {
529 struct nfc_llcp_sock *llcp_sock, *n, *parent_sock;
530 struct sock *sk;
531
532 parent_sock = nfc_llcp_sock(parent);
533
534 list_for_each_entry_safe(llcp_sock, n, &parent_sock->accept_queue,
535 accept_queue) {
536 sk = &llcp_sock->sk;
537
538 if (sk->sk_state == LLCP_CONNECTED)
539 return POLLIN | POLLRDNORM;
540 }
541
542 return 0;
543 }
544
llcp_sock_poll(struct file * file,struct socket * sock,poll_table * wait)545 static unsigned int llcp_sock_poll(struct file *file, struct socket *sock,
546 poll_table *wait)
547 {
548 struct sock *sk = sock->sk;
549 unsigned int mask = 0;
550
551 pr_debug("%p\n", sk);
552
553 sock_poll_wait(file, sk_sleep(sk), wait);
554
555 if (sk->sk_state == LLCP_LISTEN)
556 return llcp_accept_poll(sk);
557
558 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
559 mask |= POLLERR |
560 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
561
562 if (!skb_queue_empty(&sk->sk_receive_queue))
563 mask |= POLLIN | POLLRDNORM;
564
565 if (sk->sk_state == LLCP_CLOSED)
566 mask |= POLLHUP;
567
568 if (sk->sk_shutdown & RCV_SHUTDOWN)
569 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
570
571 if (sk->sk_shutdown == SHUTDOWN_MASK)
572 mask |= POLLHUP;
573
574 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
575 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
576 else
577 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
578
579 pr_debug("mask 0x%x\n", mask);
580
581 return mask;
582 }
583
llcp_sock_release(struct socket * sock)584 static int llcp_sock_release(struct socket *sock)
585 {
586 struct sock *sk = sock->sk;
587 struct nfc_llcp_local *local;
588 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
589 int err = 0;
590
591 if (!sk)
592 return 0;
593
594 pr_debug("%p\n", sk);
595
596 local = llcp_sock->local;
597 if (local == NULL) {
598 err = -ENODEV;
599 goto out;
600 }
601
602 lock_sock(sk);
603
604 /* Send a DISC */
605 if (sk->sk_state == LLCP_CONNECTED)
606 nfc_llcp_send_disconnect(llcp_sock);
607
608 if (sk->sk_state == LLCP_LISTEN) {
609 struct nfc_llcp_sock *lsk, *n;
610 struct sock *accept_sk;
611
612 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
613 accept_queue) {
614 accept_sk = &lsk->sk;
615 lock_sock(accept_sk);
616
617 nfc_llcp_send_disconnect(lsk);
618 nfc_llcp_accept_unlink(accept_sk);
619
620 release_sock(accept_sk);
621 }
622 }
623
624 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
625 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
626
627 release_sock(sk);
628
629 /* Keep this sock alive and therefore do not remove it from the sockets
630 * list until the DISC PDU has been actually sent. Otherwise we would
631 * reply with DM PDUs before sending the DISC one.
632 */
633 if (sk->sk_state == LLCP_DISCONNECTING)
634 return err;
635
636 if (sock->type == SOCK_RAW)
637 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
638 else
639 nfc_llcp_sock_unlink(&local->sockets, sk);
640
641 out:
642 sock_orphan(sk);
643 sock_put(sk);
644
645 return err;
646 }
647
llcp_sock_connect(struct socket * sock,struct sockaddr * _addr,int len,int flags)648 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
649 int len, int flags)
650 {
651 struct sock *sk = sock->sk;
652 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
653 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
654 struct nfc_dev *dev;
655 struct nfc_llcp_local *local;
656 int ret = 0;
657
658 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
659
660 if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
661 return -EINVAL;
662
663 if (addr->service_name_len == 0 && addr->dsap == 0)
664 return -EINVAL;
665
666 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
667 addr->target_idx, addr->nfc_protocol);
668
669 lock_sock(sk);
670
671 if (sk->sk_state == LLCP_CONNECTED) {
672 ret = -EISCONN;
673 goto error;
674 }
675
676 dev = nfc_get_device(addr->dev_idx);
677 if (dev == NULL) {
678 ret = -ENODEV;
679 goto error;
680 }
681
682 local = nfc_llcp_find_local(dev);
683 if (local == NULL) {
684 ret = -ENODEV;
685 goto put_dev;
686 }
687
688 device_lock(&dev->dev);
689 if (dev->dep_link_up == false) {
690 ret = -ENOLINK;
691 device_unlock(&dev->dev);
692 goto put_dev;
693 }
694 device_unlock(&dev->dev);
695
696 if (local->rf_mode == NFC_RF_INITIATOR &&
697 addr->target_idx != local->target_idx) {
698 ret = -ENOLINK;
699 goto put_dev;
700 }
701
702 llcp_sock->dev = dev;
703 llcp_sock->local = nfc_llcp_local_get(local);
704 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
705 if (llcp_sock->ssap == LLCP_SAP_MAX) {
706 ret = -ENOMEM;
707 goto put_dev;
708 }
709
710 llcp_sock->reserved_ssap = llcp_sock->ssap;
711
712 if (addr->service_name_len == 0)
713 llcp_sock->dsap = addr->dsap;
714 else
715 llcp_sock->dsap = LLCP_SAP_SDP;
716 llcp_sock->nfc_protocol = addr->nfc_protocol;
717 llcp_sock->service_name_len = min_t(unsigned int,
718 addr->service_name_len,
719 NFC_LLCP_MAX_SERVICE_NAME);
720 llcp_sock->service_name = kmemdup(addr->service_name,
721 llcp_sock->service_name_len,
722 GFP_KERNEL);
723
724 nfc_llcp_sock_link(&local->connecting_sockets, sk);
725
726 ret = nfc_llcp_send_connect(llcp_sock);
727 if (ret)
728 goto sock_unlink;
729
730 sk->sk_state = LLCP_CONNECTING;
731
732 ret = sock_wait_state(sk, LLCP_CONNECTED,
733 sock_sndtimeo(sk, flags & O_NONBLOCK));
734 if (ret && ret != -EINPROGRESS)
735 goto sock_unlink;
736
737 release_sock(sk);
738
739 return ret;
740
741 sock_unlink:
742 nfc_llcp_put_ssap(local, llcp_sock->ssap);
743
744 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
745
746 put_dev:
747 nfc_put_device(dev);
748
749 error:
750 release_sock(sk);
751 return ret;
752 }
753
llcp_sock_sendmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t len)754 static int llcp_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
755 struct msghdr *msg, size_t len)
756 {
757 struct sock *sk = sock->sk;
758 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
759 int ret;
760
761 pr_debug("sock %p sk %p", sock, sk);
762
763 ret = sock_error(sk);
764 if (ret)
765 return ret;
766
767 if (msg->msg_flags & MSG_OOB)
768 return -EOPNOTSUPP;
769
770 lock_sock(sk);
771
772 if (sk->sk_type == SOCK_DGRAM) {
773 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
774 msg->msg_name);
775
776 if (msg->msg_namelen < sizeof(*addr)) {
777 release_sock(sk);
778 return -EINVAL;
779 }
780
781 release_sock(sk);
782
783 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
784 msg, len);
785 }
786
787 if (sk->sk_state != LLCP_CONNECTED) {
788 release_sock(sk);
789 return -ENOTCONN;
790 }
791
792 release_sock(sk);
793
794 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
795 }
796
llcp_sock_recvmsg(struct kiocb * iocb,struct socket * sock,struct msghdr * msg,size_t len,int flags)797 static int llcp_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
798 struct msghdr *msg, size_t len, int flags)
799 {
800 int noblock = flags & MSG_DONTWAIT;
801 struct sock *sk = sock->sk;
802 unsigned int copied, rlen;
803 struct sk_buff *skb, *cskb;
804 int err = 0;
805
806 pr_debug("%p %zu\n", sk, len);
807
808 lock_sock(sk);
809
810 if (sk->sk_state == LLCP_CLOSED &&
811 skb_queue_empty(&sk->sk_receive_queue)) {
812 release_sock(sk);
813 return 0;
814 }
815
816 release_sock(sk);
817
818 if (flags & (MSG_OOB))
819 return -EOPNOTSUPP;
820
821 skb = skb_recv_datagram(sk, flags, noblock, &err);
822 if (!skb) {
823 pr_err("Recv datagram failed state %d %d %d",
824 sk->sk_state, err, sock_error(sk));
825
826 if (sk->sk_shutdown & RCV_SHUTDOWN)
827 return 0;
828
829 return err;
830 }
831
832 rlen = skb->len; /* real length of skb */
833 copied = min_t(unsigned int, rlen, len);
834
835 cskb = skb;
836 if (skb_copy_datagram_iovec(cskb, 0, msg->msg_iov, copied)) {
837 if (!(flags & MSG_PEEK))
838 skb_queue_head(&sk->sk_receive_queue, skb);
839 return -EFAULT;
840 }
841
842 sock_recv_timestamp(msg, sk, skb);
843
844 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
845 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
846 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
847 msg->msg_name);
848
849 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
850
851 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
852
853 memset(sockaddr, 0, sizeof(*sockaddr));
854 sockaddr->sa_family = AF_NFC;
855 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
856 sockaddr->dsap = ui_cb->dsap;
857 sockaddr->ssap = ui_cb->ssap;
858 }
859
860 /* Mark read part of skb as used */
861 if (!(flags & MSG_PEEK)) {
862
863 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
864 if (sk->sk_type == SOCK_STREAM ||
865 sk->sk_type == SOCK_DGRAM ||
866 sk->sk_type == SOCK_RAW) {
867 skb_pull(skb, copied);
868 if (skb->len) {
869 skb_queue_head(&sk->sk_receive_queue, skb);
870 goto done;
871 }
872 }
873
874 kfree_skb(skb);
875 }
876
877 /* XXX Queue backlogged skbs */
878
879 done:
880 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
881 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
882 copied = rlen;
883
884 return copied;
885 }
886
887 static const struct proto_ops llcp_sock_ops = {
888 .family = PF_NFC,
889 .owner = THIS_MODULE,
890 .bind = llcp_sock_bind,
891 .connect = llcp_sock_connect,
892 .release = llcp_sock_release,
893 .socketpair = sock_no_socketpair,
894 .accept = llcp_sock_accept,
895 .getname = llcp_sock_getname,
896 .poll = llcp_sock_poll,
897 .ioctl = sock_no_ioctl,
898 .listen = llcp_sock_listen,
899 .shutdown = sock_no_shutdown,
900 .setsockopt = nfc_llcp_setsockopt,
901 .getsockopt = nfc_llcp_getsockopt,
902 .sendmsg = llcp_sock_sendmsg,
903 .recvmsg = llcp_sock_recvmsg,
904 .mmap = sock_no_mmap,
905 };
906
907 static const struct proto_ops llcp_rawsock_ops = {
908 .family = PF_NFC,
909 .owner = THIS_MODULE,
910 .bind = llcp_raw_sock_bind,
911 .connect = sock_no_connect,
912 .release = llcp_sock_release,
913 .socketpair = sock_no_socketpair,
914 .accept = sock_no_accept,
915 .getname = llcp_sock_getname,
916 .poll = llcp_sock_poll,
917 .ioctl = sock_no_ioctl,
918 .listen = sock_no_listen,
919 .shutdown = sock_no_shutdown,
920 .setsockopt = sock_no_setsockopt,
921 .getsockopt = sock_no_getsockopt,
922 .sendmsg = sock_no_sendmsg,
923 .recvmsg = llcp_sock_recvmsg,
924 .mmap = sock_no_mmap,
925 };
926
llcp_sock_destruct(struct sock * sk)927 static void llcp_sock_destruct(struct sock *sk)
928 {
929 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
930
931 pr_debug("%p\n", sk);
932
933 if (sk->sk_state == LLCP_CONNECTED)
934 nfc_put_device(llcp_sock->dev);
935
936 skb_queue_purge(&sk->sk_receive_queue);
937
938 nfc_llcp_sock_free(llcp_sock);
939
940 if (!sock_flag(sk, SOCK_DEAD)) {
941 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
942 return;
943 }
944 }
945
nfc_llcp_sock_alloc(struct socket * sock,int type,gfp_t gfp)946 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp)
947 {
948 struct sock *sk;
949 struct nfc_llcp_sock *llcp_sock;
950
951 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto);
952 if (!sk)
953 return NULL;
954
955 llcp_sock = nfc_llcp_sock(sk);
956
957 sock_init_data(sock, sk);
958 sk->sk_state = LLCP_CLOSED;
959 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
960 sk->sk_type = type;
961 sk->sk_destruct = llcp_sock_destruct;
962
963 llcp_sock->ssap = 0;
964 llcp_sock->dsap = LLCP_SAP_SDP;
965 llcp_sock->rw = LLCP_MAX_RW + 1;
966 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
967 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
968 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
969 llcp_sock->remote_ready = 1;
970 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
971 nfc_llcp_socket_remote_param_init(llcp_sock);
972 skb_queue_head_init(&llcp_sock->tx_queue);
973 skb_queue_head_init(&llcp_sock->tx_pending_queue);
974 INIT_LIST_HEAD(&llcp_sock->accept_queue);
975
976 if (sock != NULL)
977 sock->state = SS_UNCONNECTED;
978
979 return sk;
980 }
981
nfc_llcp_sock_free(struct nfc_llcp_sock * sock)982 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
983 {
984 kfree(sock->service_name);
985
986 skb_queue_purge(&sock->tx_queue);
987 skb_queue_purge(&sock->tx_pending_queue);
988
989 list_del_init(&sock->accept_queue);
990
991 sock->parent = NULL;
992
993 nfc_llcp_local_put(sock->local);
994 }
995
llcp_sock_create(struct net * net,struct socket * sock,const struct nfc_protocol * nfc_proto)996 static int llcp_sock_create(struct net *net, struct socket *sock,
997 const struct nfc_protocol *nfc_proto)
998 {
999 struct sock *sk;
1000
1001 pr_debug("%p\n", sock);
1002
1003 if (sock->type != SOCK_STREAM &&
1004 sock->type != SOCK_DGRAM &&
1005 sock->type != SOCK_RAW)
1006 return -ESOCKTNOSUPPORT;
1007
1008 if (sock->type == SOCK_RAW)
1009 sock->ops = &llcp_rawsock_ops;
1010 else
1011 sock->ops = &llcp_sock_ops;
1012
1013 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC);
1014 if (sk == NULL)
1015 return -ENOMEM;
1016
1017 return 0;
1018 }
1019
1020 static const struct nfc_protocol llcp_nfc_proto = {
1021 .id = NFC_SOCKPROTO_LLCP,
1022 .proto = &llcp_sock_proto,
1023 .owner = THIS_MODULE,
1024 .create = llcp_sock_create
1025 };
1026
nfc_llcp_sock_init(void)1027 int __init nfc_llcp_sock_init(void)
1028 {
1029 return nfc_proto_register(&llcp_nfc_proto);
1030 }
1031
nfc_llcp_sock_exit(void)1032 void nfc_llcp_sock_exit(void)
1033 {
1034 nfc_proto_unregister(&llcp_nfc_proto);
1035 }
1036