1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 */
5
6 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
7
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/nfc.h>
12 #include <linux/sched/signal.h>
13
14 #include "nfc.h"
15 #include "llcp.h"
16
17 static int sock_wait_state(struct sock *sk, int state, unsigned long timeo)
18 {
19 DECLARE_WAITQUEUE(wait, current);
20 int err = 0;
21
22 pr_debug("sk %p", sk);
23
24 add_wait_queue(sk_sleep(sk), &wait);
25 set_current_state(TASK_INTERRUPTIBLE);
26
27 while (sk->sk_state != state) {
28 if (!timeo) {
29 err = -EINPROGRESS;
30 break;
31 }
32
33 if (signal_pending(current)) {
34 err = sock_intr_errno(timeo);
35 break;
36 }
37
38 release_sock(sk);
39 timeo = schedule_timeout(timeo);
40 lock_sock(sk);
41 set_current_state(TASK_INTERRUPTIBLE);
42
43 err = sock_error(sk);
44 if (err)
45 break;
46 }
47
48 __set_current_state(TASK_RUNNING);
49 remove_wait_queue(sk_sleep(sk), &wait);
50 return err;
51 }
52
53 static struct proto llcp_sock_proto = {
54 .name = "NFC_LLCP",
55 .owner = THIS_MODULE,
56 .obj_size = sizeof(struct nfc_llcp_sock),
57 };
58
59 static int llcp_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
60 {
61 struct sock *sk = sock->sk;
62 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
63 struct nfc_llcp_local *local;
64 struct nfc_dev *dev;
65 struct sockaddr_nfc_llcp llcp_addr;
66 int len, ret = 0;
67
68 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
69 addr->sa_family != AF_NFC)
70 return -EINVAL;
71
72 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
73
74 memset(&llcp_addr, 0, sizeof(llcp_addr));
75 len = min_t(unsigned int, sizeof(llcp_addr), alen);
76 memcpy(&llcp_addr, addr, len);
77
78 /* This is going to be a listening socket, dsap must be 0 */
79 if (llcp_addr.dsap != 0)
80 return -EINVAL;
81
82 lock_sock(sk);
83
84 if (sk->sk_state != LLCP_CLOSED) {
85 ret = -EBADFD;
86 goto error;
87 }
88
89 dev = nfc_get_device(llcp_addr.dev_idx);
90 if (dev == NULL) {
91 ret = -ENODEV;
92 goto error;
93 }
94
95 local = nfc_llcp_find_local(dev);
96 if (local == NULL) {
97 ret = -ENODEV;
98 goto put_dev;
99 }
100
101 llcp_sock->dev = dev;
102 llcp_sock->local = local;
103 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
104 llcp_sock->service_name_len = min_t(unsigned int,
105 llcp_addr.service_name_len,
106 NFC_LLCP_MAX_SERVICE_NAME);
107 llcp_sock->service_name = kmemdup(llcp_addr.service_name,
108 llcp_sock->service_name_len,
109 GFP_KERNEL);
110 if (!llcp_sock->service_name) {
111 ret = -ENOMEM;
112 goto sock_llcp_put_local;
113 }
114 llcp_sock->ssap = nfc_llcp_get_sdp_ssap(local, llcp_sock);
115 if (llcp_sock->ssap == LLCP_SAP_MAX) {
116 ret = -EADDRINUSE;
117 goto free_service_name;
118 }
119
120 llcp_sock->reserved_ssap = llcp_sock->ssap;
121
122 nfc_llcp_sock_link(&local->sockets, sk);
123
124 pr_debug("Socket bound to SAP %d\n", llcp_sock->ssap);
125
126 sk->sk_state = LLCP_BOUND;
127 nfc_put_device(dev);
128 release_sock(sk);
129
130 return 0;
131
132 free_service_name:
133 kfree(llcp_sock->service_name);
134 llcp_sock->service_name = NULL;
135
136 sock_llcp_put_local:
137 nfc_llcp_local_put(llcp_sock->local);
138 llcp_sock->local = NULL;
139 llcp_sock->dev = NULL;
140
141 put_dev:
142 nfc_put_device(dev);
143
144 error:
145 release_sock(sk);
146 return ret;
147 }
148
149 static int llcp_raw_sock_bind(struct socket *sock, struct sockaddr *addr,
150 int alen)
151 {
152 struct sock *sk = sock->sk;
153 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
154 struct nfc_llcp_local *local;
155 struct nfc_dev *dev;
156 struct sockaddr_nfc_llcp llcp_addr;
157 int len, ret = 0;
158
159 if (!addr || alen < offsetofend(struct sockaddr, sa_family) ||
160 addr->sa_family != AF_NFC)
161 return -EINVAL;
162
163 pr_debug("sk %p addr %p family %d\n", sk, addr, addr->sa_family);
164
165 memset(&llcp_addr, 0, sizeof(llcp_addr));
166 len = min_t(unsigned int, sizeof(llcp_addr), alen);
167 memcpy(&llcp_addr, addr, len);
168
169 lock_sock(sk);
170
171 if (sk->sk_state != LLCP_CLOSED) {
172 ret = -EBADFD;
173 goto error;
174 }
175
176 dev = nfc_get_device(llcp_addr.dev_idx);
177 if (dev == NULL) {
178 ret = -ENODEV;
179 goto error;
180 }
181
182 local = nfc_llcp_find_local(dev);
183 if (local == NULL) {
184 ret = -ENODEV;
185 goto put_dev;
186 }
187
188 llcp_sock->dev = dev;
189 llcp_sock->local = local;
190 llcp_sock->nfc_protocol = llcp_addr.nfc_protocol;
191
192 nfc_llcp_sock_link(&local->raw_sockets, sk);
193
194 sk->sk_state = LLCP_BOUND;
195
196 put_dev:
197 nfc_put_device(dev);
198
199 error:
200 release_sock(sk);
201 return ret;
202 }
203
204 static int llcp_sock_listen(struct socket *sock, int backlog)
205 {
206 struct sock *sk = sock->sk;
207 int ret = 0;
208
209 pr_debug("sk %p backlog %d\n", sk, backlog);
210
211 lock_sock(sk);
212
213 if ((sock->type != SOCK_SEQPACKET && sock->type != SOCK_STREAM) ||
214 sk->sk_state != LLCP_BOUND) {
215 ret = -EBADFD;
216 goto error;
217 }
218
219 sk->sk_max_ack_backlog = backlog;
220 sk->sk_ack_backlog = 0;
221
222 pr_debug("Socket listening\n");
223 sk->sk_state = LLCP_LISTEN;
224
225 error:
226 release_sock(sk);
227
228 return ret;
229 }
230
231 static int nfc_llcp_setsockopt(struct socket *sock, int level, int optname,
232 sockptr_t optval, unsigned int optlen)
233 {
234 struct sock *sk = sock->sk;
235 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
236 u32 opt;
237 int err = 0;
238
239 pr_debug("%p optname %d\n", sk, optname);
240
241 if (level != SOL_NFC)
242 return -ENOPROTOOPT;
243
244 lock_sock(sk);
245
246 switch (optname) {
247 case NFC_LLCP_RW:
248 if (sk->sk_state == LLCP_CONNECTED ||
249 sk->sk_state == LLCP_BOUND ||
250 sk->sk_state == LLCP_LISTEN) {
251 err = -EINVAL;
252 break;
253 }
254
255 err = copy_safe_from_sockptr(&opt, sizeof(opt),
256 optval, optlen);
257 if (err)
258 break;
259
260 if (opt > LLCP_MAX_RW) {
261 err = -EINVAL;
262 break;
263 }
264
265 llcp_sock->rw = (u8) opt;
266
267 break;
268
269 case NFC_LLCP_MIUX:
270 if (sk->sk_state == LLCP_CONNECTED ||
271 sk->sk_state == LLCP_BOUND ||
272 sk->sk_state == LLCP_LISTEN) {
273 err = -EINVAL;
274 break;
275 }
276
277 err = copy_safe_from_sockptr(&opt, sizeof(opt),
278 optval, optlen);
279 if (err)
280 break;
281
282 if (opt > LLCP_MAX_MIUX) {
283 err = -EINVAL;
284 break;
285 }
286
287 llcp_sock->miux = cpu_to_be16((u16) opt);
288
289 break;
290
291 default:
292 err = -ENOPROTOOPT;
293 break;
294 }
295
296 release_sock(sk);
297
298 pr_debug("%p rw %d miux %d\n", llcp_sock,
299 llcp_sock->rw, llcp_sock->miux);
300
301 return err;
302 }
303
304 static int nfc_llcp_getsockopt(struct socket *sock, int level, int optname,
305 char __user *optval, int __user *optlen)
306 {
307 struct nfc_llcp_local *local;
308 struct sock *sk = sock->sk;
309 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
310 int len, err = 0;
311 u16 miux, remote_miu;
312 u8 rw;
313
314 pr_debug("%p optname %d\n", sk, optname);
315
316 if (level != SOL_NFC)
317 return -ENOPROTOOPT;
318
319 if (get_user(len, optlen))
320 return -EFAULT;
321
322 local = llcp_sock->local;
323 if (!local)
324 return -ENODEV;
325
326 len = min_t(u32, len, sizeof(u32));
327
328 lock_sock(sk);
329
330 switch (optname) {
331 case NFC_LLCP_RW:
332 rw = llcp_sock->rw > LLCP_MAX_RW ? local->rw : llcp_sock->rw;
333 if (put_user(rw, (u32 __user *) optval))
334 err = -EFAULT;
335
336 break;
337
338 case NFC_LLCP_MIUX:
339 miux = be16_to_cpu(llcp_sock->miux) > LLCP_MAX_MIUX ?
340 be16_to_cpu(local->miux) : be16_to_cpu(llcp_sock->miux);
341
342 if (put_user(miux, (u32 __user *) optval))
343 err = -EFAULT;
344
345 break;
346
347 case NFC_LLCP_REMOTE_MIU:
348 remote_miu = llcp_sock->remote_miu > LLCP_MAX_MIU ?
349 local->remote_miu : llcp_sock->remote_miu;
350
351 if (put_user(remote_miu, (u32 __user *) optval))
352 err = -EFAULT;
353
354 break;
355
356 case NFC_LLCP_REMOTE_LTO:
357 if (put_user(local->remote_lto / 10, (u32 __user *) optval))
358 err = -EFAULT;
359
360 break;
361
362 case NFC_LLCP_REMOTE_RW:
363 if (put_user(llcp_sock->remote_rw, (u32 __user *) optval))
364 err = -EFAULT;
365
366 break;
367
368 default:
369 err = -ENOPROTOOPT;
370 break;
371 }
372
373 release_sock(sk);
374
375 if (put_user(len, optlen))
376 return -EFAULT;
377
378 return err;
379 }
380
381 void nfc_llcp_accept_unlink(struct sock *sk)
382 {
383 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
384
385 pr_debug("state %d\n", sk->sk_state);
386
387 list_del_init(&llcp_sock->accept_queue);
388 sk_acceptq_removed(llcp_sock->parent);
389 llcp_sock->parent = NULL;
390
391 sock_put(sk);
392 }
393
394 void nfc_llcp_accept_enqueue(struct sock *parent, struct sock *sk)
395 {
396 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
397 struct nfc_llcp_sock *llcp_sock_parent = nfc_llcp_sock(parent);
398
399 /* Lock will be free from unlink */
400 sock_hold(sk);
401
402 list_add_tail(&llcp_sock->accept_queue,
403 &llcp_sock_parent->accept_queue);
404 llcp_sock->parent = parent;
405 sk_acceptq_added(parent);
406 }
407
408 struct sock *nfc_llcp_accept_dequeue(struct sock *parent,
409 struct socket *newsock)
410 {
411 struct nfc_llcp_sock *lsk, *n, *llcp_parent;
412 struct sock *sk;
413
414 llcp_parent = nfc_llcp_sock(parent);
415
416 list_for_each_entry_safe(lsk, n, &llcp_parent->accept_queue,
417 accept_queue) {
418 sk = &lsk->sk;
419 lock_sock(sk);
420
421 if (sk->sk_state == LLCP_CLOSED) {
422 release_sock(sk);
423 nfc_llcp_accept_unlink(sk);
424 continue;
425 }
426
427 if (sk->sk_state == LLCP_CONNECTED || !newsock) {
428 list_del_init(&lsk->accept_queue);
429 sock_put(sk);
430
431 if (newsock)
432 sock_graft(sk, newsock);
433
434 release_sock(sk);
435
436 pr_debug("Returning sk state %d\n", sk->sk_state);
437
438 sk_acceptq_removed(parent);
439
440 return sk;
441 }
442
443 release_sock(sk);
444 }
445
446 return NULL;
447 }
448
449 static int llcp_sock_accept(struct socket *sock, struct socket *newsock,
450 struct proto_accept_arg *arg)
451 {
452 DECLARE_WAITQUEUE(wait, current);
453 struct sock *sk = sock->sk, *new_sk;
454 long timeo;
455 int ret = 0;
456
457 pr_debug("parent %p\n", sk);
458
459 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
460
461 if (sk->sk_state != LLCP_LISTEN) {
462 ret = -EBADFD;
463 goto error;
464 }
465
466 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
467
468 /* Wait for an incoming connection. */
469 add_wait_queue_exclusive(sk_sleep(sk), &wait);
470 while (!(new_sk = nfc_llcp_accept_dequeue(sk, newsock))) {
471 set_current_state(TASK_INTERRUPTIBLE);
472
473 if (!timeo) {
474 ret = -EAGAIN;
475 break;
476 }
477
478 if (signal_pending(current)) {
479 ret = sock_intr_errno(timeo);
480 break;
481 }
482
483 release_sock(sk);
484 timeo = schedule_timeout(timeo);
485 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
486 }
487 __set_current_state(TASK_RUNNING);
488 remove_wait_queue(sk_sleep(sk), &wait);
489
490 if (ret)
491 goto error;
492
493 newsock->state = SS_CONNECTED;
494
495 pr_debug("new socket %p\n", new_sk);
496
497 error:
498 release_sock(sk);
499
500 return ret;
501 }
502
503 static int llcp_sock_getname(struct socket *sock, struct sockaddr *uaddr,
504 int peer)
505 {
506 struct sock *sk = sock->sk;
507 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
508 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, llcp_addr, uaddr);
509
510 if (llcp_sock == NULL || llcp_sock->dev == NULL)
511 return -EBADFD;
512
513 pr_debug("%p %d %d %d\n", sk, llcp_sock->target_idx,
514 llcp_sock->dsap, llcp_sock->ssap);
515
516 memset(llcp_addr, 0, sizeof(*llcp_addr));
517
518 lock_sock(sk);
519 if (!llcp_sock->dev) {
520 release_sock(sk);
521 return -EBADFD;
522 }
523 llcp_addr->sa_family = AF_NFC;
524 llcp_addr->dev_idx = llcp_sock->dev->idx;
525 llcp_addr->target_idx = llcp_sock->target_idx;
526 llcp_addr->nfc_protocol = llcp_sock->nfc_protocol;
527 llcp_addr->dsap = llcp_sock->dsap;
528 llcp_addr->ssap = llcp_sock->ssap;
529 llcp_addr->service_name_len = llcp_sock->service_name_len;
530 memcpy(llcp_addr->service_name, llcp_sock->service_name,
531 llcp_addr->service_name_len);
532 release_sock(sk);
533
534 return sizeof(struct sockaddr_nfc_llcp);
535 }
536
537 static inline __poll_t llcp_accept_poll(struct sock *parent)
538 {
539 struct nfc_llcp_sock *llcp_sock, *parent_sock;
540 struct sock *sk;
541
542 parent_sock = nfc_llcp_sock(parent);
543
544 list_for_each_entry(llcp_sock, &parent_sock->accept_queue,
545 accept_queue) {
546 sk = &llcp_sock->sk;
547
548 if (sk->sk_state == LLCP_CONNECTED)
549 return EPOLLIN | EPOLLRDNORM;
550 }
551
552 return 0;
553 }
554
555 static __poll_t llcp_sock_poll(struct file *file, struct socket *sock,
556 poll_table *wait)
557 {
558 struct sock *sk = sock->sk;
559 __poll_t mask = 0;
560
561 pr_debug("%p\n", sk);
562
563 sock_poll_wait(file, sock, wait);
564
565 if (sk->sk_state == LLCP_LISTEN)
566 return llcp_accept_poll(sk);
567
568 if (sk->sk_err || !skb_queue_empty_lockless(&sk->sk_error_queue))
569 mask |= EPOLLERR |
570 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0);
571
572 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
573 mask |= EPOLLIN | EPOLLRDNORM;
574
575 if (sk->sk_state == LLCP_CLOSED)
576 mask |= EPOLLHUP;
577
578 if (sk->sk_shutdown & RCV_SHUTDOWN)
579 mask |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
580
581 if (sk->sk_shutdown == SHUTDOWN_MASK)
582 mask |= EPOLLHUP;
583
584 if (sock_writeable(sk) && sk->sk_state == LLCP_CONNECTED)
585 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
586 else
587 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
588
589 pr_debug("mask 0x%x\n", mask);
590
591 return mask;
592 }
593
594 static int llcp_sock_release(struct socket *sock)
595 {
596 struct sock *sk = sock->sk;
597 struct nfc_llcp_local *local;
598 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
599 int err = 0;
600
601 if (!sk)
602 return 0;
603
604 pr_debug("%p\n", sk);
605
606 local = llcp_sock->local;
607 if (local == NULL) {
608 err = -ENODEV;
609 goto out;
610 }
611
612 lock_sock(sk);
613
614 /* Send a DISC */
615 if (sk->sk_state == LLCP_CONNECTED)
616 nfc_llcp_send_disconnect(llcp_sock);
617
618 if (sk->sk_state == LLCP_LISTEN) {
619 struct nfc_llcp_sock *lsk, *n;
620 struct sock *accept_sk;
621
622 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
623 accept_queue) {
624 accept_sk = &lsk->sk;
625 lock_sock(accept_sk);
626
627 nfc_llcp_send_disconnect(lsk);
628 nfc_llcp_accept_unlink(accept_sk);
629
630 release_sock(accept_sk);
631 }
632 }
633
634 if (sock->type == SOCK_RAW)
635 nfc_llcp_sock_unlink(&local->raw_sockets, sk);
636 else
637 nfc_llcp_sock_unlink(&local->sockets, sk);
638
639 if (llcp_sock->reserved_ssap < LLCP_SAP_MAX)
640 nfc_llcp_put_ssap(llcp_sock->local, llcp_sock->ssap);
641
642 release_sock(sk);
643
644 out:
645 sock_orphan(sk);
646 sock_put(sk);
647
648 return err;
649 }
650
651 static int llcp_sock_connect(struct socket *sock, struct sockaddr *_addr,
652 int len, int flags)
653 {
654 struct sock *sk = sock->sk;
655 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
656 struct sockaddr_nfc_llcp *addr = (struct sockaddr_nfc_llcp *)_addr;
657 struct nfc_dev *dev;
658 struct nfc_llcp_local *local;
659 int ret = 0;
660
661 pr_debug("sock %p sk %p flags 0x%x\n", sock, sk, flags);
662
663 if (!addr || len < sizeof(*addr) || addr->sa_family != AF_NFC)
664 return -EINVAL;
665
666 if (addr->service_name_len == 0 && addr->dsap == 0)
667 return -EINVAL;
668
669 pr_debug("addr dev_idx=%u target_idx=%u protocol=%u\n", addr->dev_idx,
670 addr->target_idx, addr->nfc_protocol);
671
672 lock_sock(sk);
673
674 if (sk->sk_state == LLCP_CONNECTED) {
675 ret = -EISCONN;
676 goto error;
677 }
678 if (sk->sk_state == LLCP_CONNECTING) {
679 ret = -EINPROGRESS;
680 goto error;
681 }
682
683 dev = nfc_get_device(addr->dev_idx);
684 if (dev == NULL) {
685 ret = -ENODEV;
686 goto error;
687 }
688
689 local = nfc_llcp_find_local(dev);
690 if (local == NULL) {
691 ret = -ENODEV;
692 goto put_dev;
693 }
694
695 device_lock(&dev->dev);
696 if (dev->dep_link_up == false) {
697 ret = -ENOLINK;
698 device_unlock(&dev->dev);
699 goto sock_llcp_put_local;
700 }
701 device_unlock(&dev->dev);
702
703 if (local->rf_mode == NFC_RF_INITIATOR &&
704 addr->target_idx != local->target_idx) {
705 ret = -ENOLINK;
706 goto sock_llcp_put_local;
707 }
708
709 llcp_sock->dev = dev;
710 llcp_sock->local = local;
711 llcp_sock->ssap = nfc_llcp_get_local_ssap(local);
712 if (llcp_sock->ssap == LLCP_SAP_MAX) {
713 ret = -ENOMEM;
714 goto sock_llcp_nullify;
715 }
716
717 llcp_sock->reserved_ssap = llcp_sock->ssap;
718
719 if (addr->service_name_len == 0)
720 llcp_sock->dsap = addr->dsap;
721 else
722 llcp_sock->dsap = LLCP_SAP_SDP;
723 llcp_sock->nfc_protocol = addr->nfc_protocol;
724 llcp_sock->service_name_len = min_t(unsigned int,
725 addr->service_name_len,
726 NFC_LLCP_MAX_SERVICE_NAME);
727 llcp_sock->service_name = kmemdup(addr->service_name,
728 llcp_sock->service_name_len,
729 GFP_KERNEL);
730 if (!llcp_sock->service_name) {
731 ret = -ENOMEM;
732 goto sock_llcp_release;
733 }
734
735 nfc_llcp_sock_link(&local->connecting_sockets, sk);
736
737 ret = nfc_llcp_send_connect(llcp_sock);
738 if (ret)
739 goto sock_unlink;
740
741 sk->sk_state = LLCP_CONNECTING;
742
743 ret = sock_wait_state(sk, LLCP_CONNECTED,
744 sock_sndtimeo(sk, flags & O_NONBLOCK));
745 if (ret && ret != -EINPROGRESS)
746 goto sock_unlink;
747
748 release_sock(sk);
749
750 return ret;
751
752 sock_unlink:
753 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
754 kfree(llcp_sock->service_name);
755 llcp_sock->service_name = NULL;
756
757 sock_llcp_release:
758 nfc_llcp_put_ssap(local, llcp_sock->ssap);
759
760 sock_llcp_nullify:
761 llcp_sock->local = NULL;
762 llcp_sock->dev = NULL;
763
764 sock_llcp_put_local:
765 nfc_llcp_local_put(local);
766
767 put_dev:
768 nfc_put_device(dev);
769
770 error:
771 release_sock(sk);
772 return ret;
773 }
774
775 static int llcp_sock_sendmsg(struct socket *sock, struct msghdr *msg,
776 size_t len)
777 {
778 struct sock *sk = sock->sk;
779 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
780 int ret;
781
782 pr_debug("sock %p sk %p", sock, sk);
783
784 ret = sock_error(sk);
785 if (ret)
786 return ret;
787
788 if (msg->msg_flags & MSG_OOB)
789 return -EOPNOTSUPP;
790
791 lock_sock(sk);
792
793 if (!llcp_sock->local) {
794 release_sock(sk);
795 return -ENODEV;
796 }
797
798 if (sk->sk_type == SOCK_DGRAM) {
799 if (sk->sk_state != LLCP_BOUND) {
800 release_sock(sk);
801 return -ENOTCONN;
802 }
803
804 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, addr,
805 msg->msg_name);
806
807 if (msg->msg_namelen < sizeof(*addr)) {
808 release_sock(sk);
809 return -EINVAL;
810 }
811
812 release_sock(sk);
813
814 return nfc_llcp_send_ui_frame(llcp_sock, addr->dsap, addr->ssap,
815 msg, len);
816 }
817
818 if (sk->sk_state != LLCP_CONNECTED) {
819 release_sock(sk);
820 return -ENOTCONN;
821 }
822
823 release_sock(sk);
824
825 return nfc_llcp_send_i_frame(llcp_sock, msg, len);
826 }
827
828 static int llcp_sock_recvmsg(struct socket *sock, struct msghdr *msg,
829 size_t len, int flags)
830 {
831 struct sock *sk = sock->sk;
832 unsigned int copied, rlen;
833 struct sk_buff *skb, *cskb;
834 int err = 0;
835
836 pr_debug("%p %zu\n", sk, len);
837
838 lock_sock(sk);
839
840 if (sk->sk_state == LLCP_CLOSED &&
841 skb_queue_empty(&sk->sk_receive_queue)) {
842 release_sock(sk);
843 return 0;
844 }
845
846 release_sock(sk);
847
848 if (flags & (MSG_OOB))
849 return -EOPNOTSUPP;
850
851 skb = skb_recv_datagram(sk, flags, &err);
852 if (!skb) {
853 pr_err("Recv datagram failed state %d %d %d",
854 sk->sk_state, err, sock_error(sk));
855
856 if (sk->sk_shutdown & RCV_SHUTDOWN)
857 return 0;
858
859 return err;
860 }
861
862 rlen = skb->len; /* real length of skb */
863 copied = min_t(unsigned int, rlen, len);
864
865 cskb = skb;
866 if (skb_copy_datagram_msg(cskb, 0, msg, copied)) {
867 if (!(flags & MSG_PEEK))
868 skb_queue_head(&sk->sk_receive_queue, skb);
869 return -EFAULT;
870 }
871
872 sock_recv_timestamp(msg, sk, skb);
873
874 if (sk->sk_type == SOCK_DGRAM && msg->msg_name) {
875 struct nfc_llcp_ui_cb *ui_cb = nfc_llcp_ui_skb_cb(skb);
876 DECLARE_SOCKADDR(struct sockaddr_nfc_llcp *, sockaddr,
877 msg->msg_name);
878
879 msg->msg_namelen = sizeof(struct sockaddr_nfc_llcp);
880
881 pr_debug("Datagram socket %d %d\n", ui_cb->dsap, ui_cb->ssap);
882
883 memset(sockaddr, 0, sizeof(*sockaddr));
884 sockaddr->sa_family = AF_NFC;
885 sockaddr->nfc_protocol = NFC_PROTO_NFC_DEP;
886 sockaddr->dsap = ui_cb->dsap;
887 sockaddr->ssap = ui_cb->ssap;
888 }
889
890 /* Mark read part of skb as used */
891 if (!(flags & MSG_PEEK)) {
892
893 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
894 if (sk->sk_type == SOCK_STREAM ||
895 sk->sk_type == SOCK_DGRAM ||
896 sk->sk_type == SOCK_RAW) {
897 skb_pull(skb, copied);
898 if (skb->len) {
899 skb_queue_head(&sk->sk_receive_queue, skb);
900 goto done;
901 }
902 }
903
904 kfree_skb(skb);
905 }
906
907 /* XXX Queue backlogged skbs */
908
909 done:
910 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
911 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
912 copied = rlen;
913
914 return copied;
915 }
916
917 static const struct proto_ops llcp_sock_ops = {
918 .family = PF_NFC,
919 .owner = THIS_MODULE,
920 .bind = llcp_sock_bind,
921 .connect = llcp_sock_connect,
922 .release = llcp_sock_release,
923 .socketpair = sock_no_socketpair,
924 .accept = llcp_sock_accept,
925 .getname = llcp_sock_getname,
926 .poll = llcp_sock_poll,
927 .ioctl = sock_no_ioctl,
928 .listen = llcp_sock_listen,
929 .shutdown = sock_no_shutdown,
930 .setsockopt = nfc_llcp_setsockopt,
931 .getsockopt = nfc_llcp_getsockopt,
932 .sendmsg = llcp_sock_sendmsg,
933 .recvmsg = llcp_sock_recvmsg,
934 .mmap = sock_no_mmap,
935 };
936
937 static const struct proto_ops llcp_rawsock_ops = {
938 .family = PF_NFC,
939 .owner = THIS_MODULE,
940 .bind = llcp_raw_sock_bind,
941 .connect = sock_no_connect,
942 .release = llcp_sock_release,
943 .socketpair = sock_no_socketpair,
944 .accept = sock_no_accept,
945 .getname = llcp_sock_getname,
946 .poll = llcp_sock_poll,
947 .ioctl = sock_no_ioctl,
948 .listen = sock_no_listen,
949 .shutdown = sock_no_shutdown,
950 .sendmsg = sock_no_sendmsg,
951 .recvmsg = llcp_sock_recvmsg,
952 .mmap = sock_no_mmap,
953 };
954
955 static void llcp_sock_destruct(struct sock *sk)
956 {
957 struct nfc_llcp_sock *llcp_sock = nfc_llcp_sock(sk);
958
959 pr_debug("%p\n", sk);
960
961 if (sk->sk_state == LLCP_CONNECTED)
962 nfc_put_device(llcp_sock->dev);
963
964 skb_queue_purge(&sk->sk_receive_queue);
965
966 nfc_llcp_sock_free(llcp_sock);
967
968 if (!sock_flag(sk, SOCK_DEAD)) {
969 pr_err("Freeing alive NFC LLCP socket %p\n", sk);
970 return;
971 }
972 }
973
974 struct sock *nfc_llcp_sock_alloc(struct socket *sock, int type, gfp_t gfp, int kern)
975 {
976 struct sock *sk;
977 struct nfc_llcp_sock *llcp_sock;
978
979 sk = sk_alloc(&init_net, PF_NFC, gfp, &llcp_sock_proto, kern);
980 if (!sk)
981 return NULL;
982
983 llcp_sock = nfc_llcp_sock(sk);
984
985 sock_init_data(sock, sk);
986 sk->sk_state = LLCP_CLOSED;
987 sk->sk_protocol = NFC_SOCKPROTO_LLCP;
988 sk->sk_type = type;
989 sk->sk_destruct = llcp_sock_destruct;
990
991 llcp_sock->ssap = 0;
992 llcp_sock->dsap = LLCP_SAP_SDP;
993 llcp_sock->rw = LLCP_MAX_RW + 1;
994 llcp_sock->miux = cpu_to_be16(LLCP_MAX_MIUX + 1);
995 llcp_sock->send_n = llcp_sock->send_ack_n = 0;
996 llcp_sock->recv_n = llcp_sock->recv_ack_n = 0;
997 llcp_sock->remote_ready = 1;
998 llcp_sock->reserved_ssap = LLCP_SAP_MAX;
999 nfc_llcp_socket_remote_param_init(llcp_sock);
1000 skb_queue_head_init(&llcp_sock->tx_queue);
1001 skb_queue_head_init(&llcp_sock->tx_pending_queue);
1002 INIT_LIST_HEAD(&llcp_sock->accept_queue);
1003
1004 if (sock != NULL)
1005 sock->state = SS_UNCONNECTED;
1006
1007 return sk;
1008 }
1009
1010 void nfc_llcp_sock_free(struct nfc_llcp_sock *sock)
1011 {
1012 kfree(sock->service_name);
1013
1014 skb_queue_purge(&sock->tx_queue);
1015 skb_queue_purge(&sock->tx_pending_queue);
1016
1017 list_del_init(&sock->accept_queue);
1018
1019 sock->parent = NULL;
1020
1021 nfc_llcp_local_put(sock->local);
1022 }
1023
1024 static int llcp_sock_create(struct net *net, struct socket *sock,
1025 const struct nfc_protocol *nfc_proto, int kern)
1026 {
1027 struct sock *sk;
1028
1029 pr_debug("%p\n", sock);
1030
1031 if (sock->type != SOCK_STREAM &&
1032 sock->type != SOCK_DGRAM &&
1033 sock->type != SOCK_RAW)
1034 return -ESOCKTNOSUPPORT;
1035
1036 if (sock->type == SOCK_RAW) {
1037 if (!capable(CAP_NET_RAW))
1038 return -EPERM;
1039 sock->ops = &llcp_rawsock_ops;
1040 } else {
1041 sock->ops = &llcp_sock_ops;
1042 }
1043
1044 sk = nfc_llcp_sock_alloc(sock, sock->type, GFP_ATOMIC, kern);
1045 if (sk == NULL)
1046 return -ENOMEM;
1047
1048 return 0;
1049 }
1050
1051 static const struct nfc_protocol llcp_nfc_proto = {
1052 .id = NFC_SOCKPROTO_LLCP,
1053 .proto = &llcp_sock_proto,
1054 .owner = THIS_MODULE,
1055 .create = llcp_sock_create
1056 };
1057
1058 int __init nfc_llcp_sock_init(void)
1059 {
1060 return nfc_proto_register(&llcp_nfc_proto);
1061 }
1062
1063 void nfc_llcp_sock_exit(void)
1064 {
1065 nfc_proto_unregister(&llcp_nfc_proto);
1066 }
1067
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