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Merge branch 'exynos-drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-artful-kernel.git] / net / nfc / llcp / llcp.c
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, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/nfc.h>
26
27 #include "../nfc.h"
28 #include "llcp.h"
29
30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31
32 static struct list_head llcp_devices;
33
34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
35 {
36 write_lock(&l->lock);
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
39 }
40
41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
42 {
43 write_lock(&l->lock);
44 sk_del_node_init(sk);
45 write_unlock(&l->lock);
46 }
47
48 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
49 {
50 struct nfc_llcp_local *local = sock->local;
51 struct sk_buff *s, *tmp;
52
53 pr_debug("%p\n", &sock->sk);
54
55 skb_queue_purge(&sock->tx_queue);
56 skb_queue_purge(&sock->tx_pending_queue);
57
58 if (local == NULL)
59 return;
60
61 /* Search for local pending SKBs that are related to this socket */
62 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
63 if (s->sk != &sock->sk)
64 continue;
65
66 skb_unlink(s, &local->tx_queue);
67 kfree_skb(s);
68 }
69 }
70
71 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
72 int err)
73 {
74 struct sock *sk;
75 struct hlist_node *tmp;
76 struct nfc_llcp_sock *llcp_sock;
77
78 skb_queue_purge(&local->tx_queue);
79
80 write_lock(&local->sockets.lock);
81
82 sk_for_each_safe(sk, tmp, &local->sockets.head) {
83 llcp_sock = nfc_llcp_sock(sk);
84
85 bh_lock_sock(sk);
86
87 nfc_llcp_socket_purge(llcp_sock);
88
89 if (sk->sk_state == LLCP_CONNECTED)
90 nfc_put_device(llcp_sock->dev);
91
92 if (sk->sk_state == LLCP_LISTEN) {
93 struct nfc_llcp_sock *lsk, *n;
94 struct sock *accept_sk;
95
96 list_for_each_entry_safe(lsk, n,
97 &llcp_sock->accept_queue,
98 accept_queue) {
99 accept_sk = &lsk->sk;
100 bh_lock_sock(accept_sk);
101
102 nfc_llcp_accept_unlink(accept_sk);
103
104 if (err)
105 accept_sk->sk_err = err;
106 accept_sk->sk_state = LLCP_CLOSED;
107 accept_sk->sk_state_change(sk);
108
109 bh_unlock_sock(accept_sk);
110
111 sock_orphan(accept_sk);
112 }
113
114 if (listen == true) {
115 bh_unlock_sock(sk);
116 continue;
117 }
118 }
119
120 /*
121 * If we have a connection less socket bound, we keep it alive
122 * if the device is still present.
123 */
124 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
125 listen == true) {
126 bh_unlock_sock(sk);
127 continue;
128 }
129
130 if (err)
131 sk->sk_err = err;
132 sk->sk_state = LLCP_CLOSED;
133 sk->sk_state_change(sk);
134
135 bh_unlock_sock(sk);
136
137 sock_orphan(sk);
138
139 sk_del_node_init(sk);
140 }
141
142 write_unlock(&local->sockets.lock);
143
144 /*
145 * If we want to keep the listening sockets alive,
146 * we don't touch the RAW ones.
147 */
148 if (listen == true)
149 return;
150
151 write_lock(&local->raw_sockets.lock);
152
153 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
154 llcp_sock = nfc_llcp_sock(sk);
155
156 bh_lock_sock(sk);
157
158 nfc_llcp_socket_purge(llcp_sock);
159
160 if (err)
161 sk->sk_err = err;
162 sk->sk_state = LLCP_CLOSED;
163 sk->sk_state_change(sk);
164
165 bh_unlock_sock(sk);
166
167 sock_orphan(sk);
168
169 sk_del_node_init(sk);
170 }
171
172 write_unlock(&local->raw_sockets.lock);
173 }
174
175 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
176 {
177 kref_get(&local->ref);
178
179 return local;
180 }
181
182 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
183 {
184 nfc_llcp_socket_release(local, listen, ENXIO);
185 del_timer_sync(&local->link_timer);
186 skb_queue_purge(&local->tx_queue);
187 cancel_work_sync(&local->tx_work);
188 cancel_work_sync(&local->rx_work);
189 cancel_work_sync(&local->timeout_work);
190 kfree_skb(local->rx_pending);
191 }
192
193 static void local_release(struct kref *ref)
194 {
195 struct nfc_llcp_local *local;
196
197 local = container_of(ref, struct nfc_llcp_local, ref);
198
199 list_del(&local->list);
200 local_cleanup(local, false);
201 kfree(local);
202 }
203
204 int nfc_llcp_local_put(struct nfc_llcp_local *local)
205 {
206 if (local == NULL)
207 return 0;
208
209 return kref_put(&local->ref, local_release);
210 }
211
212 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
213 u8 ssap, u8 dsap)
214 {
215 struct sock *sk;
216 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
217
218 pr_debug("ssap dsap %d %d\n", ssap, dsap);
219
220 if (ssap == 0 && dsap == 0)
221 return NULL;
222
223 read_lock(&local->sockets.lock);
224
225 llcp_sock = NULL;
226
227 sk_for_each(sk, &local->sockets.head) {
228 tmp_sock = nfc_llcp_sock(sk);
229
230 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
231 llcp_sock = tmp_sock;
232 break;
233 }
234 }
235
236 read_unlock(&local->sockets.lock);
237
238 if (llcp_sock == NULL)
239 return NULL;
240
241 sock_hold(&llcp_sock->sk);
242
243 return llcp_sock;
244 }
245
246 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
247 {
248 sock_put(&sock->sk);
249 }
250
251 static void nfc_llcp_timeout_work(struct work_struct *work)
252 {
253 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
254 timeout_work);
255
256 nfc_dep_link_down(local->dev);
257 }
258
259 static void nfc_llcp_symm_timer(unsigned long data)
260 {
261 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
262
263 pr_err("SYMM timeout\n");
264
265 schedule_work(&local->timeout_work);
266 }
267
268 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
269 {
270 struct nfc_llcp_local *local, *n;
271
272 list_for_each_entry_safe(local, n, &llcp_devices, list)
273 if (local->dev == dev)
274 return local;
275
276 pr_debug("No device found\n");
277
278 return NULL;
279 }
280
281 static char *wks[] = {
282 NULL,
283 NULL, /* SDP */
284 "urn:nfc:sn:ip",
285 "urn:nfc:sn:obex",
286 "urn:nfc:sn:snep",
287 };
288
289 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
290 {
291 int sap, num_wks;
292
293 pr_debug("%s\n", service_name);
294
295 if (service_name == NULL)
296 return -EINVAL;
297
298 num_wks = ARRAY_SIZE(wks);
299
300 for (sap = 0; sap < num_wks; sap++) {
301 if (wks[sap] == NULL)
302 continue;
303
304 if (strncmp(wks[sap], service_name, service_name_len) == 0)
305 return sap;
306 }
307
308 return -EINVAL;
309 }
310
311 static
312 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
313 u8 *sn, size_t sn_len)
314 {
315 struct sock *sk;
316 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
317
318 pr_debug("sn %zd %p\n", sn_len, sn);
319
320 if (sn == NULL || sn_len == 0)
321 return NULL;
322
323 read_lock(&local->sockets.lock);
324
325 llcp_sock = NULL;
326
327 sk_for_each(sk, &local->sockets.head) {
328 tmp_sock = nfc_llcp_sock(sk);
329
330 pr_debug("llcp sock %p\n", tmp_sock);
331
332 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
333 tmp_sock->sk.sk_state != LLCP_LISTEN)
334 continue;
335
336 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
337 tmp_sock->sk.sk_state != LLCP_BOUND)
338 continue;
339
340 if (tmp_sock->service_name == NULL ||
341 tmp_sock->service_name_len == 0)
342 continue;
343
344 if (tmp_sock->service_name_len != sn_len)
345 continue;
346
347 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
348 llcp_sock = tmp_sock;
349 break;
350 }
351 }
352
353 read_unlock(&local->sockets.lock);
354
355 pr_debug("Found llcp sock %p\n", llcp_sock);
356
357 return llcp_sock;
358 }
359
360 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
361 struct nfc_llcp_sock *sock)
362 {
363 mutex_lock(&local->sdp_lock);
364
365 if (sock->service_name != NULL && sock->service_name_len > 0) {
366 int ssap = nfc_llcp_wks_sap(sock->service_name,
367 sock->service_name_len);
368
369 if (ssap > 0) {
370 pr_debug("WKS %d\n", ssap);
371
372 /* This is a WKS, let's check if it's free */
373 if (local->local_wks & BIT(ssap)) {
374 mutex_unlock(&local->sdp_lock);
375
376 return LLCP_SAP_MAX;
377 }
378
379 set_bit(ssap, &local->local_wks);
380 mutex_unlock(&local->sdp_lock);
381
382 return ssap;
383 }
384
385 /*
386 * Check if there already is a non WKS socket bound
387 * to this service name.
388 */
389 if (nfc_llcp_sock_from_sn(local, sock->service_name,
390 sock->service_name_len) != NULL) {
391 mutex_unlock(&local->sdp_lock);
392
393 return LLCP_SAP_MAX;
394 }
395
396 mutex_unlock(&local->sdp_lock);
397
398 return LLCP_SDP_UNBOUND;
399
400 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
401 if (!test_bit(sock->ssap, &local->local_wks)) {
402 set_bit(sock->ssap, &local->local_wks);
403 mutex_unlock(&local->sdp_lock);
404
405 return sock->ssap;
406 }
407 }
408
409 mutex_unlock(&local->sdp_lock);
410
411 return LLCP_SAP_MAX;
412 }
413
414 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
415 {
416 u8 local_ssap;
417
418 mutex_lock(&local->sdp_lock);
419
420 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
421 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
422 mutex_unlock(&local->sdp_lock);
423 return LLCP_SAP_MAX;
424 }
425
426 set_bit(local_ssap, &local->local_sap);
427
428 mutex_unlock(&local->sdp_lock);
429
430 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
431 }
432
433 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
434 {
435 u8 local_ssap;
436 unsigned long *sdp;
437
438 if (ssap < LLCP_WKS_NUM_SAP) {
439 local_ssap = ssap;
440 sdp = &local->local_wks;
441 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
442 atomic_t *client_cnt;
443
444 local_ssap = ssap - LLCP_WKS_NUM_SAP;
445 sdp = &local->local_sdp;
446 client_cnt = &local->local_sdp_cnt[local_ssap];
447
448 pr_debug("%d clients\n", atomic_read(client_cnt));
449
450 mutex_lock(&local->sdp_lock);
451
452 if (atomic_dec_and_test(client_cnt)) {
453 struct nfc_llcp_sock *l_sock;
454
455 pr_debug("No more clients for SAP %d\n", ssap);
456
457 clear_bit(local_ssap, sdp);
458
459 /* Find the listening sock and set it back to UNBOUND */
460 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
461 if (l_sock) {
462 l_sock->ssap = LLCP_SDP_UNBOUND;
463 nfc_llcp_sock_put(l_sock);
464 }
465 }
466
467 mutex_unlock(&local->sdp_lock);
468
469 return;
470 } else if (ssap < LLCP_MAX_SAP) {
471 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
472 sdp = &local->local_sap;
473 } else {
474 return;
475 }
476
477 mutex_lock(&local->sdp_lock);
478
479 clear_bit(local_ssap, sdp);
480
481 mutex_unlock(&local->sdp_lock);
482 }
483
484 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
485 {
486 u8 ssap;
487
488 mutex_lock(&local->sdp_lock);
489
490 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
491 if (ssap == LLCP_SDP_NUM_SAP) {
492 mutex_unlock(&local->sdp_lock);
493
494 return LLCP_SAP_MAX;
495 }
496
497 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
498
499 set_bit(ssap, &local->local_sdp);
500
501 mutex_unlock(&local->sdp_lock);
502
503 return LLCP_WKS_NUM_SAP + ssap;
504 }
505
506 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
507 {
508 u8 *gb_cur, *version_tlv, version, version_length;
509 u8 *lto_tlv, lto_length;
510 u8 *wks_tlv, wks_length;
511 u8 *miux_tlv, miux_length;
512 u8 gb_len = 0;
513 int ret = 0;
514
515 version = LLCP_VERSION_11;
516 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
517 1, &version_length);
518 gb_len += version_length;
519
520 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
521 gb_len += lto_length;
522
523 pr_debug("Local wks 0x%lx\n", local->local_wks);
524 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
525 &wks_length);
526 gb_len += wks_length;
527
528 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
529 &miux_length);
530 gb_len += miux_length;
531
532 gb_len += ARRAY_SIZE(llcp_magic);
533
534 if (gb_len > NFC_MAX_GT_LEN) {
535 ret = -EINVAL;
536 goto out;
537 }
538
539 gb_cur = local->gb;
540
541 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
542 gb_cur += ARRAY_SIZE(llcp_magic);
543
544 memcpy(gb_cur, version_tlv, version_length);
545 gb_cur += version_length;
546
547 memcpy(gb_cur, lto_tlv, lto_length);
548 gb_cur += lto_length;
549
550 memcpy(gb_cur, wks_tlv, wks_length);
551 gb_cur += wks_length;
552
553 memcpy(gb_cur, miux_tlv, miux_length);
554 gb_cur += miux_length;
555
556 local->gb_len = gb_len;
557
558 out:
559 kfree(version_tlv);
560 kfree(lto_tlv);
561 kfree(wks_tlv);
562 kfree(miux_tlv);
563
564 return ret;
565 }
566
567 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
568 {
569 struct nfc_llcp_local *local;
570
571 local = nfc_llcp_find_local(dev);
572 if (local == NULL) {
573 *general_bytes_len = 0;
574 return NULL;
575 }
576
577 nfc_llcp_build_gb(local);
578
579 *general_bytes_len = local->gb_len;
580
581 return local->gb;
582 }
583
584 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
585 {
586 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
587
588 if (local == NULL) {
589 pr_err("No LLCP device\n");
590 return -ENODEV;
591 }
592 if (gb_len < 3)
593 return -EINVAL;
594
595 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
596 memcpy(local->remote_gb, gb, gb_len);
597 local->remote_gb_len = gb_len;
598
599 if (memcmp(local->remote_gb, llcp_magic, 3)) {
600 pr_err("MAC does not support LLCP\n");
601 return -EINVAL;
602 }
603
604 return nfc_llcp_parse_gb_tlv(local,
605 &local->remote_gb[3],
606 local->remote_gb_len - 3);
607 }
608
609 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
610 {
611 return (pdu->data[0] & 0xfc) >> 2;
612 }
613
614 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
615 {
616 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
617 }
618
619 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
620 {
621 return pdu->data[1] & 0x3f;
622 }
623
624 static u8 nfc_llcp_ns(struct sk_buff *pdu)
625 {
626 return pdu->data[2] >> 4;
627 }
628
629 static u8 nfc_llcp_nr(struct sk_buff *pdu)
630 {
631 return pdu->data[2] & 0xf;
632 }
633
634 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
635 {
636 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
637 sock->send_n = (sock->send_n + 1) % 16;
638 sock->recv_ack_n = (sock->recv_n - 1) % 16;
639 }
640
641 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
642 struct sk_buff *skb, u8 direction)
643 {
644 struct sk_buff *skb_copy = NULL, *nskb;
645 struct sock *sk;
646 u8 *data;
647
648 read_lock(&local->raw_sockets.lock);
649
650 sk_for_each(sk, &local->raw_sockets.head) {
651 if (sk->sk_state != LLCP_BOUND)
652 continue;
653
654 if (skb_copy == NULL) {
655 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
656 GFP_ATOMIC);
657
658 if (skb_copy == NULL)
659 continue;
660
661 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
662
663 data[0] = local->dev ? local->dev->idx : 0xFF;
664 data[1] = direction;
665 }
666
667 nskb = skb_clone(skb_copy, GFP_ATOMIC);
668 if (!nskb)
669 continue;
670
671 if (sock_queue_rcv_skb(sk, nskb))
672 kfree_skb(nskb);
673 }
674
675 read_unlock(&local->raw_sockets.lock);
676
677 kfree_skb(skb_copy);
678 }
679
680 static void nfc_llcp_tx_work(struct work_struct *work)
681 {
682 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
683 tx_work);
684 struct sk_buff *skb;
685 struct sock *sk;
686 struct nfc_llcp_sock *llcp_sock;
687
688 skb = skb_dequeue(&local->tx_queue);
689 if (skb != NULL) {
690 sk = skb->sk;
691 llcp_sock = nfc_llcp_sock(sk);
692
693 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
694 nfc_llcp_send_symm(local->dev);
695 } else {
696 struct sk_buff *copy_skb = NULL;
697 u8 ptype = nfc_llcp_ptype(skb);
698 int ret;
699
700 pr_debug("Sending pending skb\n");
701 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
702 DUMP_PREFIX_OFFSET, 16, 1,
703 skb->data, skb->len, true);
704
705 if (ptype == LLCP_PDU_I)
706 copy_skb = skb_copy(skb, GFP_ATOMIC);
707
708 __net_timestamp(skb);
709
710 nfc_llcp_send_to_raw_sock(local, skb,
711 NFC_LLCP_DIRECTION_TX);
712
713 ret = nfc_data_exchange(local->dev, local->target_idx,
714 skb, nfc_llcp_recv, local);
715
716 if (ret) {
717 kfree_skb(copy_skb);
718 goto out;
719 }
720
721 if (ptype == LLCP_PDU_I && copy_skb)
722 skb_queue_tail(&llcp_sock->tx_pending_queue,
723 copy_skb);
724 }
725 } else {
726 nfc_llcp_send_symm(local->dev);
727 }
728
729 out:
730 mod_timer(&local->link_timer,
731 jiffies + msecs_to_jiffies(2 * local->remote_lto));
732 }
733
734 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
735 u8 ssap)
736 {
737 struct sock *sk;
738 struct nfc_llcp_sock *llcp_sock;
739
740 read_lock(&local->connecting_sockets.lock);
741
742 sk_for_each(sk, &local->connecting_sockets.head) {
743 llcp_sock = nfc_llcp_sock(sk);
744
745 if (llcp_sock->ssap == ssap) {
746 sock_hold(&llcp_sock->sk);
747 goto out;
748 }
749 }
750
751 llcp_sock = NULL;
752
753 out:
754 read_unlock(&local->connecting_sockets.lock);
755
756 return llcp_sock;
757 }
758
759 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
760 u8 *sn, size_t sn_len)
761 {
762 struct nfc_llcp_sock *llcp_sock;
763
764 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
765
766 if (llcp_sock == NULL)
767 return NULL;
768
769 sock_hold(&llcp_sock->sk);
770
771 return llcp_sock;
772 }
773
774 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
775 {
776 u8 *tlv = &skb->data[2], type, length;
777 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
778
779 while (offset < tlv_array_len) {
780 type = tlv[0];
781 length = tlv[1];
782
783 pr_debug("type 0x%x length %d\n", type, length);
784
785 if (type == LLCP_TLV_SN) {
786 *sn_len = length;
787 return &tlv[2];
788 }
789
790 offset += length + 2;
791 tlv += length + 2;
792 }
793
794 return NULL;
795 }
796
797 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
798 struct sk_buff *skb)
799 {
800 struct nfc_llcp_sock *llcp_sock;
801 struct nfc_llcp_ui_cb *ui_cb;
802 u8 dsap, ssap;
803
804 dsap = nfc_llcp_dsap(skb);
805 ssap = nfc_llcp_ssap(skb);
806
807 ui_cb = nfc_llcp_ui_skb_cb(skb);
808 ui_cb->dsap = dsap;
809 ui_cb->ssap = ssap;
810
811 printk("%s %d %d\n", __func__, dsap, ssap);
812
813 pr_debug("%d %d\n", dsap, ssap);
814
815 /* We're looking for a bound socket, not a client one */
816 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
817 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
818 return;
819
820 /* There is no sequence with UI frames */
821 skb_pull(skb, LLCP_HEADER_SIZE);
822 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
823 /*
824 * UI frames will be freed from the socket layer, so we
825 * need to keep them alive until someone receives them.
826 */
827 skb_get(skb);
828 } else {
829 pr_err("Receive queue is full\n");
830 kfree_skb(skb);
831 }
832
833 nfc_llcp_sock_put(llcp_sock);
834 }
835
836 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
837 struct sk_buff *skb)
838 {
839 struct sock *new_sk, *parent;
840 struct nfc_llcp_sock *sock, *new_sock;
841 u8 dsap, ssap, reason;
842
843 dsap = nfc_llcp_dsap(skb);
844 ssap = nfc_llcp_ssap(skb);
845
846 pr_debug("%d %d\n", dsap, ssap);
847
848 if (dsap != LLCP_SAP_SDP) {
849 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
850 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
851 reason = LLCP_DM_NOBOUND;
852 goto fail;
853 }
854 } else {
855 u8 *sn;
856 size_t sn_len;
857
858 sn = nfc_llcp_connect_sn(skb, &sn_len);
859 if (sn == NULL) {
860 reason = LLCP_DM_NOBOUND;
861 goto fail;
862 }
863
864 pr_debug("Service name length %zu\n", sn_len);
865
866 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
867 if (sock == NULL) {
868 reason = LLCP_DM_NOBOUND;
869 goto fail;
870 }
871 }
872
873 lock_sock(&sock->sk);
874
875 parent = &sock->sk;
876
877 if (sk_acceptq_is_full(parent)) {
878 reason = LLCP_DM_REJ;
879 release_sock(&sock->sk);
880 sock_put(&sock->sk);
881 goto fail;
882 }
883
884 if (sock->ssap == LLCP_SDP_UNBOUND) {
885 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
886
887 pr_debug("First client, reserving %d\n", ssap);
888
889 if (ssap == LLCP_SAP_MAX) {
890 reason = LLCP_DM_REJ;
891 release_sock(&sock->sk);
892 sock_put(&sock->sk);
893 goto fail;
894 }
895
896 sock->ssap = ssap;
897 }
898
899 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
900 if (new_sk == NULL) {
901 reason = LLCP_DM_REJ;
902 release_sock(&sock->sk);
903 sock_put(&sock->sk);
904 goto fail;
905 }
906
907 new_sock = nfc_llcp_sock(new_sk);
908 new_sock->dev = local->dev;
909 new_sock->local = nfc_llcp_local_get(local);
910 new_sock->miu = local->remote_miu;
911 new_sock->nfc_protocol = sock->nfc_protocol;
912 new_sock->dsap = ssap;
913 new_sock->target_idx = local->target_idx;
914 new_sock->parent = parent;
915 new_sock->ssap = sock->ssap;
916 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
917 atomic_t *client_count;
918
919 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
920
921 client_count =
922 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
923
924 atomic_inc(client_count);
925 new_sock->reserved_ssap = sock->ssap;
926 }
927
928 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
929 skb->len - LLCP_HEADER_SIZE);
930
931 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
932
933 nfc_llcp_sock_link(&local->sockets, new_sk);
934
935 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
936
937 nfc_get_device(local->dev->idx);
938
939 new_sk->sk_state = LLCP_CONNECTED;
940
941 /* Wake the listening processes */
942 parent->sk_data_ready(parent, 0);
943
944 /* Send CC */
945 nfc_llcp_send_cc(new_sock);
946
947 release_sock(&sock->sk);
948 sock_put(&sock->sk);
949
950 return;
951
952 fail:
953 /* Send DM */
954 nfc_llcp_send_dm(local, dsap, ssap, reason);
955 }
956
957 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
958 {
959 int nr_frames = 0;
960 struct nfc_llcp_local *local = sock->local;
961
962 pr_debug("Remote ready %d tx queue len %d remote rw %d",
963 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
964 sock->rw);
965
966 /* Try to queue some I frames for transmission */
967 while (sock->remote_ready &&
968 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
969 struct sk_buff *pdu;
970
971 pdu = skb_dequeue(&sock->tx_queue);
972 if (pdu == NULL)
973 break;
974
975 /* Update N(S)/N(R) */
976 nfc_llcp_set_nrns(sock, pdu);
977
978 skb_queue_tail(&local->tx_queue, pdu);
979 nr_frames++;
980 }
981
982 return nr_frames;
983 }
984
985 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
986 struct sk_buff *skb)
987 {
988 struct nfc_llcp_sock *llcp_sock;
989 struct sock *sk;
990 u8 dsap, ssap, ptype, ns, nr;
991
992 ptype = nfc_llcp_ptype(skb);
993 dsap = nfc_llcp_dsap(skb);
994 ssap = nfc_llcp_ssap(skb);
995 ns = nfc_llcp_ns(skb);
996 nr = nfc_llcp_nr(skb);
997
998 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
999
1000 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1001 if (llcp_sock == NULL) {
1002 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1003 return;
1004 }
1005
1006 sk = &llcp_sock->sk;
1007 lock_sock(sk);
1008 if (sk->sk_state == LLCP_CLOSED) {
1009 release_sock(sk);
1010 nfc_llcp_sock_put(llcp_sock);
1011 }
1012
1013 /* Pass the payload upstream */
1014 if (ptype == LLCP_PDU_I) {
1015 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1016
1017 if (ns == llcp_sock->recv_n)
1018 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1019 else
1020 pr_err("Received out of sequence I PDU\n");
1021
1022 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1023 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1024 /*
1025 * I frames will be freed from the socket layer, so we
1026 * need to keep them alive until someone receives them.
1027 */
1028 skb_get(skb);
1029 } else {
1030 pr_err("Receive queue is full\n");
1031 kfree_skb(skb);
1032 }
1033 }
1034
1035 /* Remove skbs from the pending queue */
1036 if (llcp_sock->send_ack_n != nr) {
1037 struct sk_buff *s, *tmp;
1038 u8 n;
1039
1040 llcp_sock->send_ack_n = nr;
1041
1042 /* Remove and free all skbs until ns == nr */
1043 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1044 n = nfc_llcp_ns(s);
1045
1046 skb_unlink(s, &llcp_sock->tx_pending_queue);
1047 kfree_skb(s);
1048
1049 if (n == nr)
1050 break;
1051 }
1052
1053 /* Re-queue the remaining skbs for transmission */
1054 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1055 s, tmp) {
1056 skb_unlink(s, &llcp_sock->tx_pending_queue);
1057 skb_queue_head(&local->tx_queue, s);
1058 }
1059 }
1060
1061 if (ptype == LLCP_PDU_RR)
1062 llcp_sock->remote_ready = true;
1063 else if (ptype == LLCP_PDU_RNR)
1064 llcp_sock->remote_ready = false;
1065
1066 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1067 nfc_llcp_send_rr(llcp_sock);
1068
1069 release_sock(sk);
1070 nfc_llcp_sock_put(llcp_sock);
1071 }
1072
1073 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1074 struct sk_buff *skb)
1075 {
1076 struct nfc_llcp_sock *llcp_sock;
1077 struct sock *sk;
1078 u8 dsap, ssap;
1079
1080 dsap = nfc_llcp_dsap(skb);
1081 ssap = nfc_llcp_ssap(skb);
1082
1083 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1084 if (llcp_sock == NULL) {
1085 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1086 return;
1087 }
1088
1089 sk = &llcp_sock->sk;
1090 lock_sock(sk);
1091
1092 nfc_llcp_socket_purge(llcp_sock);
1093
1094 if (sk->sk_state == LLCP_CLOSED) {
1095 release_sock(sk);
1096 nfc_llcp_sock_put(llcp_sock);
1097 }
1098
1099 if (sk->sk_state == LLCP_CONNECTED) {
1100 nfc_put_device(local->dev);
1101 sk->sk_state = LLCP_CLOSED;
1102 sk->sk_state_change(sk);
1103 }
1104
1105 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1106
1107 release_sock(sk);
1108 nfc_llcp_sock_put(llcp_sock);
1109 }
1110
1111 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1112 {
1113 struct nfc_llcp_sock *llcp_sock;
1114 struct sock *sk;
1115 u8 dsap, ssap;
1116
1117 dsap = nfc_llcp_dsap(skb);
1118 ssap = nfc_llcp_ssap(skb);
1119
1120 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1121 if (llcp_sock == NULL) {
1122 pr_err("Invalid CC\n");
1123 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1124
1125 return;
1126 }
1127
1128 sk = &llcp_sock->sk;
1129
1130 /* Unlink from connecting and link to the client array */
1131 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1132 nfc_llcp_sock_link(&local->sockets, sk);
1133 llcp_sock->dsap = ssap;
1134
1135 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1136 skb->len - LLCP_HEADER_SIZE);
1137
1138 sk->sk_state = LLCP_CONNECTED;
1139 sk->sk_state_change(sk);
1140
1141 nfc_llcp_sock_put(llcp_sock);
1142 }
1143
1144 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1145 {
1146 struct nfc_llcp_sock *llcp_sock;
1147 struct sock *sk;
1148 u8 dsap, ssap, reason;
1149
1150 dsap = nfc_llcp_dsap(skb);
1151 ssap = nfc_llcp_ssap(skb);
1152 reason = skb->data[2];
1153
1154 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1155
1156 switch (reason) {
1157 case LLCP_DM_NOBOUND:
1158 case LLCP_DM_REJ:
1159 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1160 break;
1161
1162 default:
1163 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1164 break;
1165 }
1166
1167 if (llcp_sock == NULL) {
1168 pr_debug("Already closed\n");
1169 return;
1170 }
1171
1172 sk = &llcp_sock->sk;
1173
1174 sk->sk_err = ENXIO;
1175 sk->sk_state = LLCP_CLOSED;
1176 sk->sk_state_change(sk);
1177
1178 nfc_llcp_sock_put(llcp_sock);
1179 }
1180
1181 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1182 struct sk_buff *skb)
1183 {
1184 struct nfc_llcp_sock *llcp_sock;
1185 u8 dsap, ssap, *tlv, type, length, tid, sap;
1186 u16 tlv_len, offset;
1187 char *service_name;
1188 size_t service_name_len;
1189
1190 dsap = nfc_llcp_dsap(skb);
1191 ssap = nfc_llcp_ssap(skb);
1192
1193 pr_debug("%d %d\n", dsap, ssap);
1194
1195 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1196 pr_err("Wrong SNL SAP\n");
1197 return;
1198 }
1199
1200 tlv = &skb->data[LLCP_HEADER_SIZE];
1201 tlv_len = skb->len - LLCP_HEADER_SIZE;
1202 offset = 0;
1203
1204 while (offset < tlv_len) {
1205 type = tlv[0];
1206 length = tlv[1];
1207
1208 switch (type) {
1209 case LLCP_TLV_SDREQ:
1210 tid = tlv[2];
1211 service_name = (char *) &tlv[3];
1212 service_name_len = length - 1;
1213
1214 pr_debug("Looking for %.16s\n", service_name);
1215
1216 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1217 !strncmp(service_name, "urn:nfc:sn:sdp",
1218 service_name_len)) {
1219 sap = 1;
1220 goto send_snl;
1221 }
1222
1223 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1224 service_name_len);
1225 if (!llcp_sock) {
1226 sap = 0;
1227 goto send_snl;
1228 }
1229
1230 /*
1231 * We found a socket but its ssap has not been reserved
1232 * yet. We need to assign it for good and send a reply.
1233 * The ssap will be freed when the socket is closed.
1234 */
1235 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1236 atomic_t *client_count;
1237
1238 sap = nfc_llcp_reserve_sdp_ssap(local);
1239
1240 pr_debug("Reserving %d\n", sap);
1241
1242 if (sap == LLCP_SAP_MAX) {
1243 sap = 0;
1244 goto send_snl;
1245 }
1246
1247 client_count =
1248 &local->local_sdp_cnt[sap -
1249 LLCP_WKS_NUM_SAP];
1250
1251 atomic_inc(client_count);
1252
1253 llcp_sock->ssap = sap;
1254 llcp_sock->reserved_ssap = sap;
1255 } else {
1256 sap = llcp_sock->ssap;
1257 }
1258
1259 pr_debug("%p %d\n", llcp_sock, sap);
1260
1261 send_snl:
1262 nfc_llcp_send_snl(local, tid, sap);
1263 break;
1264
1265 default:
1266 pr_err("Invalid SNL tlv value 0x%x\n", type);
1267 break;
1268 }
1269
1270 offset += length + 2;
1271 tlv += length + 2;
1272 }
1273 }
1274
1275 static void nfc_llcp_rx_work(struct work_struct *work)
1276 {
1277 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1278 rx_work);
1279 u8 dsap, ssap, ptype;
1280 struct sk_buff *skb;
1281
1282 skb = local->rx_pending;
1283 if (skb == NULL) {
1284 pr_debug("No pending SKB\n");
1285 return;
1286 }
1287
1288 ptype = nfc_llcp_ptype(skb);
1289 dsap = nfc_llcp_dsap(skb);
1290 ssap = nfc_llcp_ssap(skb);
1291
1292 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1293
1294 if (ptype != LLCP_PDU_SYMM)
1295 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1296 16, 1, skb->data, skb->len, true);
1297
1298 __net_timestamp(skb);
1299
1300 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1301
1302 switch (ptype) {
1303 case LLCP_PDU_SYMM:
1304 pr_debug("SYMM\n");
1305 break;
1306
1307 case LLCP_PDU_UI:
1308 pr_debug("UI\n");
1309 nfc_llcp_recv_ui(local, skb);
1310 break;
1311
1312 case LLCP_PDU_CONNECT:
1313 pr_debug("CONNECT\n");
1314 nfc_llcp_recv_connect(local, skb);
1315 break;
1316
1317 case LLCP_PDU_DISC:
1318 pr_debug("DISC\n");
1319 nfc_llcp_recv_disc(local, skb);
1320 break;
1321
1322 case LLCP_PDU_CC:
1323 pr_debug("CC\n");
1324 nfc_llcp_recv_cc(local, skb);
1325 break;
1326
1327 case LLCP_PDU_DM:
1328 pr_debug("DM\n");
1329 nfc_llcp_recv_dm(local, skb);
1330 break;
1331
1332 case LLCP_PDU_SNL:
1333 pr_debug("SNL\n");
1334 nfc_llcp_recv_snl(local, skb);
1335 break;
1336
1337 case LLCP_PDU_I:
1338 case LLCP_PDU_RR:
1339 case LLCP_PDU_RNR:
1340 pr_debug("I frame\n");
1341 nfc_llcp_recv_hdlc(local, skb);
1342 break;
1343
1344 }
1345
1346 schedule_work(&local->tx_work);
1347 kfree_skb(local->rx_pending);
1348 local->rx_pending = NULL;
1349 }
1350
1351 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1352 {
1353 local->rx_pending = skb;
1354 del_timer(&local->link_timer);
1355 schedule_work(&local->rx_work);
1356 }
1357
1358 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1359 {
1360 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1361
1362 pr_debug("Received an LLCP PDU\n");
1363 if (err < 0) {
1364 pr_err("err %d\n", err);
1365 return;
1366 }
1367
1368 __nfc_llcp_recv(local, skb);
1369 }
1370
1371 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1372 {
1373 struct nfc_llcp_local *local;
1374
1375 local = nfc_llcp_find_local(dev);
1376 if (local == NULL)
1377 return -ENODEV;
1378
1379 __nfc_llcp_recv(local, skb);
1380
1381 return 0;
1382 }
1383
1384 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1385 {
1386 struct nfc_llcp_local *local;
1387
1388 local = nfc_llcp_find_local(dev);
1389 if (local == NULL)
1390 return;
1391
1392 /* Close and purge all existing sockets */
1393 nfc_llcp_socket_release(local, true, 0);
1394 }
1395
1396 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1397 u8 comm_mode, u8 rf_mode)
1398 {
1399 struct nfc_llcp_local *local;
1400
1401 pr_debug("rf mode %d\n", rf_mode);
1402
1403 local = nfc_llcp_find_local(dev);
1404 if (local == NULL)
1405 return;
1406
1407 local->target_idx = target_idx;
1408 local->comm_mode = comm_mode;
1409 local->rf_mode = rf_mode;
1410
1411 if (rf_mode == NFC_RF_INITIATOR) {
1412 pr_debug("Queueing Tx work\n");
1413
1414 schedule_work(&local->tx_work);
1415 } else {
1416 mod_timer(&local->link_timer,
1417 jiffies + msecs_to_jiffies(local->remote_lto));
1418 }
1419 }
1420
1421 int nfc_llcp_register_device(struct nfc_dev *ndev)
1422 {
1423 struct nfc_llcp_local *local;
1424
1425 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1426 if (local == NULL)
1427 return -ENOMEM;
1428
1429 local->dev = ndev;
1430 INIT_LIST_HEAD(&local->list);
1431 kref_init(&local->ref);
1432 mutex_init(&local->sdp_lock);
1433 init_timer(&local->link_timer);
1434 local->link_timer.data = (unsigned long) local;
1435 local->link_timer.function = nfc_llcp_symm_timer;
1436
1437 skb_queue_head_init(&local->tx_queue);
1438 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1439
1440 local->rx_pending = NULL;
1441 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1442
1443 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1444
1445 rwlock_init(&local->sockets.lock);
1446 rwlock_init(&local->connecting_sockets.lock);
1447 rwlock_init(&local->raw_sockets.lock);
1448
1449 local->lto = 150; /* 1500 ms */
1450 local->rw = LLCP_MAX_RW;
1451 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1452
1453 nfc_llcp_build_gb(local);
1454
1455 local->remote_miu = LLCP_DEFAULT_MIU;
1456 local->remote_lto = LLCP_DEFAULT_LTO;
1457
1458 list_add(&local->list, &llcp_devices);
1459
1460 return 0;
1461 }
1462
1463 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1464 {
1465 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1466
1467 if (local == NULL) {
1468 pr_debug("No such device\n");
1469 return;
1470 }
1471
1472 local_cleanup(local, false);
1473
1474 nfc_llcp_local_put(local);
1475 }
1476
1477 int __init nfc_llcp_init(void)
1478 {
1479 INIT_LIST_HEAD(&llcp_devices);
1480
1481 return nfc_llcp_sock_init();
1482 }
1483
1484 void nfc_llcp_exit(void)
1485 {
1486 nfc_llcp_sock_exit();
1487 }
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