1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
28static 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
64static struct proto llcp_sock_proto = {
65 .name = "NFC_LLCP",
66 .owner = THIS_MODULE,
67 .obj_size = sizeof(struct nfc_llcp_sock),
68};
69
70static 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
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
135put_dev:
136 nfc_put_device(dev);
137
138error:
139 release_sock(sk);
140 return ret;
141}
142
143static 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
189put_dev:
190 nfc_put_device(dev);
191
192error:
193 release_sock(sk);
194 return ret;
195}
196
197static 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
218error:
219 release_sock(sk);
220
221 return ret;
222}
223
224static 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
297static 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
374void 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
387void 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
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
401struct 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
442static 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
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
490error:
491 release_sock(sk);
492
493 return ret;
494}
495
496static 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
531static 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
549static 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
588static 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
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
634
635
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
645out:
646 sock_orphan(sk);
647 sock_put(sk);
648
649 return err;
650}
651
652static 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
746sock_unlink:
747 nfc_llcp_put_ssap(local, llcp_sock->ssap);
748
749 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
750
751put_dev:
752 nfc_put_device(dev);
753
754error:
755 release_sock(sk);
756 return ret;
757}
758
759static 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
802static 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;
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
866 if (!(flags & MSG_PEEK)) {
867
868
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
883
884done:
885
886 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
887 copied = rlen;
888
889 return copied;
890}
891
892static 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
912static 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
932static 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
951struct 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
987void 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
1001static 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
1025static 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
1032int __init nfc_llcp_sock_init(void)
1033{
1034 return nfc_proto_register(&llcp_nfc_proto);
1035}
1036
1037void nfc_llcp_sock_exit(void)
1038{
1039 nfc_proto_unregister(&llcp_nfc_proto);
1040}
1041
