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