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NFC: Keep connection less bound sockets alive when DEP link goes down
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / nfc / llcp / llcp.c
CommitLineData
d646960f
SO		 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
30static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31
32static struct list_head llcp_devices;
33
a69f32af 34void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
d646960f 35{
a69f32af
SO		 36 write_lock(&l->lock);
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
39}
d646960f 40
a69f32af
SO		 41void 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}
d646960f 47
4d22ea15 48static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen)
a69f32af
SO		 49{
50 struct sock *sk;
51 struct hlist_node *node, *tmp;
52 struct nfc_llcp_sock *llcp_sock;
d646960f 53
a69f32af 54 write_lock(&local->sockets.lock);
40c75f81 55
a69f32af
SO		 56 sk_for_each_safe(sk, node, tmp, &local->sockets.head) {
57 llcp_sock = nfc_llcp_sock(sk);
d646960f 58
50b78b2a 59 bh_lock_sock(sk);
d646960f 60
a69f32af
SO		 61 if (sk->sk_state == LLCP_CONNECTED)
62 nfc_put_device(llcp_sock->dev);
d646960f 63
a69f32af 64 if (sk->sk_state == LLCP_LISTEN) {
d646960f
SO		 65 struct nfc_llcp_sock *lsk, *n;
66 struct sock *accept_sk;
67
a69f32af 68 list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue,
427a2eb1 69 accept_queue) {
d646960f 70 accept_sk = &lsk->sk;
50b78b2a 71 bh_lock_sock(accept_sk);
d646960f
SO		 72
73 nfc_llcp_accept_unlink(accept_sk);
74
75 accept_sk->sk_state = LLCP_CLOSED;
d646960f 76
50b78b2a 77 bh_unlock_sock(accept_sk);
d646960f
SO		 78
79 sock_orphan(accept_sk);
80 }
4d22ea15
SO		 81
82 if (listen == true) {
50b78b2a 83 bh_unlock_sock(sk);
4d22ea15
SO		 84 continue;
85 }
d646960f
SO		 86 }
87
c8512be6
SO		 88 /*
89 * If we have a connection less socket bound, we keep it alive
90 * if the device is still present.
91 */
92 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
93 listen == true) {
94 bh_unlock_sock(sk);
95 continue;
96 }
97
a69f32af 98 sk->sk_state = LLCP_CLOSED;
d646960f 99
50b78b2a 100 bh_unlock_sock(sk);
d646960f 101
a69f32af 102 sock_orphan(sk);
40c75f81 103
a69f32af 104 sk_del_node_init(sk);
d646960f
SO		 105 }
106
a69f32af 107 write_unlock(&local->sockets.lock);
d646960f
SO		 108}
109
c7aa1225
SO		 110struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
111{
112 kref_get(&local->ref);
113
114 return local;
115}
116
117static void local_release(struct kref *ref)
118{
119 struct nfc_llcp_local *local;
120
121 local = container_of(ref, struct nfc_llcp_local, ref);
122
123 list_del(&local->list);
4d22ea15 124 nfc_llcp_socket_release(local, false);
c7aa1225
SO		 125 del_timer_sync(&local->link_timer);
126 skb_queue_purge(&local->tx_queue);
474fee3d
TH		 127 cancel_work_sync(&local->tx_work);
128 cancel_work_sync(&local->rx_work);
129 cancel_work_sync(&local->timeout_work);
c7aa1225
SO		 130 kfree_skb(local->rx_pending);
131 kfree(local);
132}
133
134int nfc_llcp_local_put(struct nfc_llcp_local *local)
135{
a69f32af
SO		 136 if (local == NULL)
137 return 0;
138
c7aa1225
SO		 139 return kref_put(&local->ref, local_release);
140}
141
8f50020e
SO		 142static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
143 u8 ssap, u8 dsap)
144{
145 struct sock *sk;
146 struct hlist_node *node;
147 struct nfc_llcp_sock *llcp_sock;
148
149 pr_debug("ssap dsap %d %d\n", ssap, dsap);
150
151 if (ssap == 0 && dsap == 0)
152 return NULL;
153
154 read_lock(&local->sockets.lock);
155
156 llcp_sock = NULL;
157
158 sk_for_each(sk, node, &local->sockets.head) {
159 llcp_sock = nfc_llcp_sock(sk);
160
161 if (llcp_sock->ssap == ssap && llcp_sock->dsap == dsap)
162 break;
163 }
164
165 read_unlock(&local->sockets.lock);
166
167 if (llcp_sock == NULL)
168 return NULL;
169
170 sock_hold(&llcp_sock->sk);
171
172 return llcp_sock;
173}
174
175static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
176{
177 sock_put(&sock->sk);
178}
179
d646960f
SO		 180static void nfc_llcp_timeout_work(struct work_struct *work)
181{
182 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
427a2eb1 183 timeout_work);
d646960f
SO		 184
185 nfc_dep_link_down(local->dev);
186}
187
188static void nfc_llcp_symm_timer(unsigned long data)
189{
190 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
191
192 pr_err("SYMM timeout\n");
193
916082b0 194 schedule_work(&local->timeout_work);
d646960f
SO		 195}
196
197struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
198{
199 struct nfc_llcp_local *local, *n;
200
201 list_for_each_entry_safe(local, n, &llcp_devices, list)
202 if (local->dev == dev)
203 return local;
204
205 pr_debug("No device found\n");
206
207 return NULL;
208}
209
210static char *wks[] = {
211 NULL,
212 NULL, /* SDP */
213 "urn:nfc:sn:ip",
214 "urn:nfc:sn:obex",
215 "urn:nfc:sn:snep",
216};
217
218static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
219{
220 int sap, num_wks;
221
222 pr_debug("%s\n", service_name);
223
224 if (service_name == NULL)
225 return -EINVAL;
226
227 num_wks = ARRAY_SIZE(wks);
228
427a2eb1 229 for (sap = 0; sap < num_wks; sap++) {
d646960f
SO		 230 if (wks[sap] == NULL)
231 continue;
232
233 if (strncmp(wks[sap], service_name, service_name_len) == 0)
234 return sap;
235 }
236
237 return -EINVAL;
238}
239
8f50020e
SO		 240static
241struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
242 u8 *sn, size_t sn_len)
243{
244 struct sock *sk;
245 struct hlist_node *node;
246 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
247
248 pr_debug("sn %zd %p\n", sn_len, sn);
249
250 if (sn == NULL || sn_len == 0)
251 return NULL;
252
253 read_lock(&local->sockets.lock);
254
255 llcp_sock = NULL;
256
257 sk_for_each(sk, node, &local->sockets.head) {
258 tmp_sock = nfc_llcp_sock(sk);
259
260 pr_debug("llcp sock %p\n", tmp_sock);
261
54292d64
SO		 262 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
263 tmp_sock->sk.sk_state != LLCP_LISTEN)
264 continue;
265
266 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
267 tmp_sock->sk.sk_state != LLCP_BOUND)
8f50020e
SO		 268 continue;
269
270 if (tmp_sock->service_name == NULL ||
271 tmp_sock->service_name_len == 0)
272 continue;
273
274 if (tmp_sock->service_name_len != sn_len)
275 continue;
276
277 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
278 llcp_sock = tmp_sock;
279 break;
280 }
281 }
282
283 read_unlock(&local->sockets.lock);
284
285 pr_debug("Found llcp sock %p\n", llcp_sock);
286
287 return llcp_sock;
288}
289
d646960f 290u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
427a2eb1 291 struct nfc_llcp_sock *sock)
d646960f
SO		 292{
293 mutex_lock(&local->sdp_lock);
294
295 if (sock->service_name != NULL && sock->service_name_len > 0) {
296 int ssap = nfc_llcp_wks_sap(sock->service_name,
427a2eb1 297 sock->service_name_len);
d646960f
SO		 298
299 if (ssap > 0) {
300 pr_debug("WKS %d\n", ssap);
301
302 /* This is a WKS, let's check if it's free */
303 if (local->local_wks & BIT(ssap)) {
304 mutex_unlock(&local->sdp_lock);
305
306 return LLCP_SAP_MAX;
307 }
308
1762c17c 309 set_bit(ssap, &local->local_wks);
d646960f
SO		 310 mutex_unlock(&local->sdp_lock);
311
312 return ssap;
313 }
314
315 /*
8f50020e
SO		 316 * Check if there already is a non WKS socket bound
317 * to this service name.
d646960f 318 */
8f50020e
SO		 319 if (nfc_llcp_sock_from_sn(local, sock->service_name,
320 sock->service_name_len) != NULL) {
d646960f
SO		 321 mutex_unlock(&local->sdp_lock);
322
323 return LLCP_SAP_MAX;
324 }
325
d646960f
SO		 326 mutex_unlock(&local->sdp_lock);
327
8f50020e 328 return LLCP_SDP_UNBOUND;
d646960f 329
ebbb16d9
SO		 330 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
331 if (!test_bit(sock->ssap, &local->local_wks)) {
332 set_bit(sock->ssap, &local->local_wks);
333 mutex_unlock(&local->sdp_lock);
d646960f 334
ebbb16d9 335 return sock->ssap;
d646960f
SO		 336 }
337 }
338
339 mutex_unlock(&local->sdp_lock);
340
341 return LLCP_SAP_MAX;
342}
343
344u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
345{
346 u8 local_ssap;
347
348 mutex_lock(&local->sdp_lock);
349
350 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
351 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
352 mutex_unlock(&local->sdp_lock);
353 return LLCP_SAP_MAX;
354 }
355
1762c17c 356 set_bit(local_ssap, &local->local_sap);
d646960f
SO		 357
358 mutex_unlock(&local->sdp_lock);
359
360 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
361}
362
363void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
364{
365 u8 local_ssap;
366 unsigned long *sdp;
367
368 if (ssap < LLCP_WKS_NUM_SAP) {
369 local_ssap = ssap;
370 sdp = &local->local_wks;
371 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
8f50020e
SO		 372 atomic_t *client_cnt;
373
d646960f
SO		 374 local_ssap = ssap - LLCP_WKS_NUM_SAP;
375 sdp = &local->local_sdp;
8f50020e
SO		 376 client_cnt = &local->local_sdp_cnt[local_ssap];
377
378 pr_debug("%d clients\n", atomic_read(client_cnt));
379
380 mutex_lock(&local->sdp_lock);
381
382 if (atomic_dec_and_test(client_cnt)) {
383 struct nfc_llcp_sock *l_sock;
384
385 pr_debug("No more clients for SAP %d\n", ssap);
386
387 clear_bit(local_ssap, sdp);
388
389 /* Find the listening sock and set it back to UNBOUND */
390 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
391 if (l_sock) {
392 l_sock->ssap = LLCP_SDP_UNBOUND;
393 nfc_llcp_sock_put(l_sock);
394 }
395 }
396
397 mutex_unlock(&local->sdp_lock);
398
399 return;
d646960f
SO		 400 } else if (ssap < LLCP_MAX_SAP) {
401 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
402 sdp = &local->local_sap;
403 } else {
404 return;
405 }
406
407 mutex_lock(&local->sdp_lock);
408
1762c17c 409 clear_bit(local_ssap, sdp);
d646960f
SO		 410
411 mutex_unlock(&local->sdp_lock);
412}
413
8f50020e
SO		 414static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
415{
416 u8 ssap;
417
418 mutex_lock(&local->sdp_lock);
419
420 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
421 if (ssap == LLCP_SDP_NUM_SAP) {
422 mutex_unlock(&local->sdp_lock);
423
424 return LLCP_SAP_MAX;
425 }
426
427 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
428
429 set_bit(ssap, &local->local_sdp);
430
431 mutex_unlock(&local->sdp_lock);
432
433 return LLCP_WKS_NUM_SAP + ssap;
434}
435
d646960f
SO		 436static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
437{
438 u8 *gb_cur, *version_tlv, version, version_length;
439 u8 *lto_tlv, lto, lto_length;
440 u8 *wks_tlv, wks_length;
56d5876a
SO		 441 u8 *miux_tlv, miux_length;
442 __be16 miux;
d646960f 443 u8 gb_len = 0;
52da2449 444 int ret = 0;
d646960f
SO		 445
446 version = LLCP_VERSION_11;
447 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
427a2eb1 448 1, &version_length);
d646960f
SO		 449 gb_len += version_length;
450
451 /* 1500 ms */
452 lto = 150;
91b0ade1 453 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &lto, 1, &lto_length);
d646960f
SO		 454 gb_len += lto_length;
455
456 pr_debug("Local wks 0x%lx\n", local->local_wks);
457 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
427a2eb1 458 &wks_length);
d646960f
SO		 459 gb_len += wks_length;
460
56d5876a
SO		 461 miux = cpu_to_be16(LLCP_MAX_MIUX);
462 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
463 &miux_length);
464 gb_len += miux_length;
465
d646960f
SO		 466 gb_len += ARRAY_SIZE(llcp_magic);
467
468 if (gb_len > NFC_MAX_GT_LEN) {
52da2449
WY		 469 ret = -EINVAL;
470 goto out;
d646960f
SO		 471 }
472
473 gb_cur = local->gb;
474
475 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
476 gb_cur += ARRAY_SIZE(llcp_magic);
477
478 memcpy(gb_cur, version_tlv, version_length);
479 gb_cur += version_length;
480
481 memcpy(gb_cur, lto_tlv, lto_length);
482 gb_cur += lto_length;
483
484 memcpy(gb_cur, wks_tlv, wks_length);
485 gb_cur += wks_length;
486
56d5876a
SO		 487 memcpy(gb_cur, miux_tlv, miux_length);
488 gb_cur += miux_length;
489
52da2449
WY		 490 local->gb_len = gb_len;
491
492out:
d646960f
SO		 493 kfree(version_tlv);
494 kfree(lto_tlv);
52da2449
WY		 495 kfree(wks_tlv);
496 kfree(miux_tlv);
d646960f 497
52da2449 498 return ret;
d646960f
SO		 499}
500
b8e7a06d
SO		 501u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
502{
503 struct nfc_llcp_local *local;
504
505 local = nfc_llcp_find_local(dev);
506 if (local == NULL) {
507 *general_bytes_len = 0;
508 return NULL;
509 }
510
511 nfc_llcp_build_gb(local);
512
513 *general_bytes_len = local->gb_len;
514
515 return local->gb;
516}
517
d646960f
SO		 518int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
519{
520 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
521
522 if (local == NULL) {
523 pr_err("No LLCP device\n");
524 return -ENODEV;
525 }
526
527 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
528 memcpy(local->remote_gb, gb, gb_len);
529 local->remote_gb_len = gb_len;
530
427a2eb1 531 if (local->remote_gb == NULL || local->remote_gb_len == 0)
d646960f
SO		 532 return -ENODEV;
533
534 if (memcmp(local->remote_gb, llcp_magic, 3)) {
535 pr_err("MAC does not support LLCP\n");
536 return -EINVAL;
537 }
538
7a06e586
SO		 539 return nfc_llcp_parse_gb_tlv(local,
540 &local->remote_gb[3],
541 local->remote_gb_len - 3);
d646960f
SO		 542}
543
d646960f
SO		 544static u8 nfc_llcp_dsap(struct sk_buff *pdu)
545{
546 return (pdu->data[0] & 0xfc) >> 2;
547}
548
549static u8 nfc_llcp_ptype(struct sk_buff *pdu)
550{
551 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
552}
553
554static u8 nfc_llcp_ssap(struct sk_buff *pdu)
555{
556 return pdu->data[1] & 0x3f;
557}
558
559static u8 nfc_llcp_ns(struct sk_buff *pdu)
560{
561 return pdu->data[2] >> 4;
562}
563
564static u8 nfc_llcp_nr(struct sk_buff *pdu)
565{
566 return pdu->data[2] & 0xf;
567}
568
569static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
570{
279cf174 571 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
d646960f
SO		 572 sock->send_n = (sock->send_n + 1) % 16;
573 sock->recv_ack_n = (sock->recv_n - 1) % 16;
574}
575
4463523b
TE		 576void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
577 struct sk_buff *skb, u8 direction)
578{
579 struct hlist_node *node;
580 struct sk_buff *skb_copy = NULL, *nskb;
581 struct sock *sk;
582 u8 *data;
583
584 read_lock(&local->raw_sockets.lock);
585
586 sk_for_each(sk, node, &local->raw_sockets.head) {
587 if (sk->sk_state != LLCP_BOUND)
588 continue;
589
590 if (skb_copy == NULL) {
591 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
592 GFP_ATOMIC);
593
594 if (skb_copy == NULL)
595 continue;
596
597 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
598
599 data[0] = local->dev ? local->dev->idx : 0xFF;
600 data[1] = direction;
601 }
602
603 nskb = skb_clone(skb_copy, GFP_ATOMIC);
604 if (!nskb)
605 continue;
606
607 if (sock_queue_rcv_skb(sk, nskb))
608 kfree_skb(nskb);
609 }
610
611 read_unlock(&local->raw_sockets.lock);
612
613 kfree_skb(skb_copy);
614}
615
84457960
SO		 616static void nfc_llcp_tx_work(struct work_struct *work)
617{
618 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
619 tx_work);
620 struct sk_buff *skb;
621 struct sock *sk;
622 struct nfc_llcp_sock *llcp_sock;
623
624 skb = skb_dequeue(&local->tx_queue);
625 if (skb != NULL) {
626 sk = skb->sk;
627 llcp_sock = nfc_llcp_sock(sk);
a6a0915f
SO		 628
629 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
630 nfc_llcp_send_symm(local->dev);
631 } else {
84457960
SO		 632 int ret;
633
634 pr_debug("Sending pending skb\n");
635 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
636 DUMP_PREFIX_OFFSET, 16, 1,
637 skb->data, skb->len, true);
638
4463523b
TE		 639 nfc_llcp_send_to_raw_sock(local, skb,
640 NFC_LLCP_DIRECTION_TX);
641
84457960
SO		 642 ret = nfc_data_exchange(local->dev, local->target_idx,
643 skb, nfc_llcp_recv, local);
644
645 if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
646 skb = skb_get(skb);
647 skb_queue_tail(&llcp_sock->tx_pending_queue,
648 skb);
649 }
84457960
SO		 650 }
651 } else {
652 nfc_llcp_send_symm(local->dev);
653 }
654
655 mod_timer(&local->link_timer,
656 jiffies + msecs_to_jiffies(2 * local->remote_lto));
657}
658
a69f32af
SO		 659static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
660 u8 ssap)
661{
662 struct sock *sk;
663 struct nfc_llcp_sock *llcp_sock;
664 struct hlist_node *node;
665
666 read_lock(&local->connecting_sockets.lock);
667
668 sk_for_each(sk, node, &local->connecting_sockets.head) {
669 llcp_sock = nfc_llcp_sock(sk);
670
5a0f6f3b
SO		 671 if (llcp_sock->ssap == ssap) {
672 sock_hold(&llcp_sock->sk);
a69f32af 673 goto out;
5a0f6f3b 674 }
a69f32af
SO		 675 }
676
677 llcp_sock = NULL;
678
679out:
680 read_unlock(&local->connecting_sockets.lock);
681
a69f32af
SO		 682 return llcp_sock;
683}
684
a69f32af
SO		 685static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
686 u8 *sn, size_t sn_len)
687{
a69f32af
SO		 688 struct nfc_llcp_sock *llcp_sock;
689
8f50020e 690 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
d646960f 691
a69f32af
SO		 692 if (llcp_sock == NULL)
693 return NULL;
d646960f 694
a69f32af
SO		 695 sock_hold(&llcp_sock->sk);
696
697 return llcp_sock;
d646960f
SO		 698}
699
d646960f
SO		 700static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
701{
702 u8 *tlv = &skb->data[2], type, length;
703 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
704
705 while (offset < tlv_array_len) {
706 type = tlv[0];
707 length = tlv[1];
708
709 pr_debug("type 0x%x length %d\n", type, length);
710
711 if (type == LLCP_TLV_SN) {
712 *sn_len = length;
713 return &tlv[2];
714 }
715
716 offset += length + 2;
717 tlv += length + 2;
718 }
719
720 return NULL;
721}
722
723static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
427a2eb1 724 struct sk_buff *skb)
d646960f
SO		 725{
726 struct sock *new_sk, *parent;
727 struct nfc_llcp_sock *sock, *new_sock;
a69f32af 728 u8 dsap, ssap, reason;
d646960f
SO		 729
730 dsap = nfc_llcp_dsap(skb);
731 ssap = nfc_llcp_ssap(skb);
732
733 pr_debug("%d %d\n", dsap, ssap);
734
d646960f 735 if (dsap != LLCP_SAP_SDP) {
a69f32af
SO		 736 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
737 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
d646960f
SO		 738 reason = LLCP_DM_NOBOUND;
739 goto fail;
740 }
d646960f
SO		 741 } else {
742 u8 *sn;
743 size_t sn_len;
744
745 sn = nfc_llcp_connect_sn(skb, &sn_len);
746 if (sn == NULL) {
747 reason = LLCP_DM_NOBOUND;
748 goto fail;
749 }
750
751 pr_debug("Service name length %zu\n", sn_len);
752
a69f32af
SO		 753 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
754 if (sock == NULL) {
755 reason = LLCP_DM_NOBOUND;
756 goto fail;
d646960f 757 }
d646960f
SO		 758 }
759
a69f32af 760 lock_sock(&sock->sk);
d646960f 761
d646960f
SO		 762 parent = &sock->sk;
763
764 if (sk_acceptq_is_full(parent)) {
765 reason = LLCP_DM_REJ;
766 release_sock(&sock->sk);
767 sock_put(&sock->sk);
768 goto fail;
769 }
770
8f50020e
SO		 771 if (sock->ssap == LLCP_SDP_UNBOUND) {
772 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
773
774 pr_debug("First client, reserving %d\n", ssap);
775
776 if (ssap == LLCP_SAP_MAX) {
777 reason = LLCP_DM_REJ;
778 release_sock(&sock->sk);
779 sock_put(&sock->sk);
780 goto fail;
781 }
782
783 sock->ssap = ssap;
784 }
785
427a2eb1 786 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
d646960f
SO		 787 if (new_sk == NULL) {
788 reason = LLCP_DM_REJ;
789 release_sock(&sock->sk);
790 sock_put(&sock->sk);
791 goto fail;
792 }
793
794 new_sock = nfc_llcp_sock(new_sk);
795 new_sock->dev = local->dev;
c7aa1225 796 new_sock->local = nfc_llcp_local_get(local);
93d7e490 797 new_sock->miu = local->remote_miu;
d646960f 798 new_sock->nfc_protocol = sock->nfc_protocol;
d646960f 799 new_sock->dsap = ssap;
025f1520 800 new_sock->target_idx = local->target_idx;
d646960f 801 new_sock->parent = parent;
8f50020e
SO		 802 new_sock->ssap = sock->ssap;
803 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
804 atomic_t *client_count;
805
806 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
807
808 client_count =
809 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
810
811 atomic_inc(client_count);
812 new_sock->reserved_ssap = sock->ssap;
813 }
d646960f 814
7a06e586
SO		 815 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
816 skb->len - LLCP_HEADER_SIZE);
817
d646960f
SO		 818 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
819
a69f32af 820 nfc_llcp_sock_link(&local->sockets, new_sk);
d646960f
SO		 821
822 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
823
824 nfc_get_device(local->dev->idx);
825
826 new_sk->sk_state = LLCP_CONNECTED;
827
828 /* Wake the listening processes */
829 parent->sk_data_ready(parent, 0);
830
831 /* Send CC */
832 nfc_llcp_send_cc(new_sock);
833
834 release_sock(&sock->sk);
835 sock_put(&sock->sk);
836
837 return;
838
839fail:
840 /* Send DM */
841 nfc_llcp_send_dm(local, dsap, ssap, reason);
d646960f
SO		 842}
843
d094afa1 844int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
4722d2b7 845{
d094afa1 846 int nr_frames = 0;
4722d2b7
SO		 847 struct nfc_llcp_local *local = sock->local;
848
849 pr_debug("Remote ready %d tx queue len %d remote rw %d",
427a2eb1 850 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
7a06e586 851 sock->rw);
4722d2b7
SO		 852
853 /* Try to queue some I frames for transmission */
854 while (sock->remote_ready &&
7a06e586 855 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
84457960 856 struct sk_buff *pdu;
4722d2b7
SO		 857
858 pdu = skb_dequeue(&sock->tx_queue);
859 if (pdu == NULL)
860 break;
861
862 /* Update N(S)/N(R) */
863 nfc_llcp_set_nrns(sock, pdu);
864
4722d2b7 865 skb_queue_tail(&local->tx_queue, pdu);
d094afa1 866 nr_frames++;
4722d2b7 867 }
d094afa1
SO		 868
869 return nr_frames;
4722d2b7
SO		 870}
871
d646960f 872static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
427a2eb1 873 struct sk_buff *skb)
d646960f
SO		 874{
875 struct nfc_llcp_sock *llcp_sock;
876 struct sock *sk;
877 u8 dsap, ssap, ptype, ns, nr;
878
879 ptype = nfc_llcp_ptype(skb);
880 dsap = nfc_llcp_dsap(skb);
881 ssap = nfc_llcp_ssap(skb);
882 ns = nfc_llcp_ns(skb);
883 nr = nfc_llcp_nr(skb);
884
885 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
886
887 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
888 if (llcp_sock == NULL) {
889 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
890 return;
891 }
892
893 sk = &llcp_sock->sk;
894 lock_sock(sk);
895 if (sk->sk_state == LLCP_CLOSED) {
896 release_sock(sk);
897 nfc_llcp_sock_put(llcp_sock);
898 }
899
d646960f
SO		 900 /* Pass the payload upstream */
901 if (ptype == LLCP_PDU_I) {
902 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
903
53aef920
SO		 904 if (ns == llcp_sock->recv_n)
905 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
906 else
907 pr_err("Received out of sequence I PDU\n");
908
d646960f
SO		 909 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
910 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
911 pr_err("receive queue is full\n");
912 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
913 }
914 }
915
916 /* Remove skbs from the pending queue */
917 if (llcp_sock->send_ack_n != nr) {
918 struct sk_buff *s, *tmp;
919
920 llcp_sock->send_ack_n = nr;
921
84457960
SO		 922 /* Remove and free all skbs until ns == nr */
923 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
924 skb_unlink(s, &llcp_sock->tx_pending_queue);
925 kfree_skb(s);
926
927 if (nfc_llcp_ns(s) == nr)
928 break;
929 }
930
931 /* Re-queue the remaining skbs for transmission */
932 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
933 s, tmp) {
934 skb_unlink(s, &llcp_sock->tx_pending_queue);
935 skb_queue_head(&local->tx_queue, s);
936 }
d646960f
SO		 937 }
938
53aef920
SO		 939 if (ptype == LLCP_PDU_RR)
940 llcp_sock->remote_ready = true;
427a2eb1 941 else if (ptype == LLCP_PDU_RNR)
53aef920
SO		 942 llcp_sock->remote_ready = false;
943
56af2568 944 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
d094afa1 945 nfc_llcp_send_rr(llcp_sock);
d646960f
SO		 946
947 release_sock(sk);
948 nfc_llcp_sock_put(llcp_sock);
949}
950
951static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
427a2eb1 952 struct sk_buff *skb)
d646960f
SO		 953{
954 struct nfc_llcp_sock *llcp_sock;
955 struct sock *sk;
956 u8 dsap, ssap;
957
958 dsap = nfc_llcp_dsap(skb);
959 ssap = nfc_llcp_ssap(skb);
960
961 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
962 if (llcp_sock == NULL) {
963 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
964 return;
965 }
966
967 sk = &llcp_sock->sk;
968 lock_sock(sk);
969 if (sk->sk_state == LLCP_CLOSED) {
970 release_sock(sk);
971 nfc_llcp_sock_put(llcp_sock);
972 }
973
d646960f
SO		 974 if (sk->sk_state == LLCP_CONNECTED) {
975 nfc_put_device(local->dev);
976 sk->sk_state = LLCP_CLOSED;
977 sk->sk_state_change(sk);
978 }
979
980 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
981
982 release_sock(sk);
983 nfc_llcp_sock_put(llcp_sock);
984}
985
427a2eb1 986static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
d646960f
SO		 987{
988 struct nfc_llcp_sock *llcp_sock;
ff353d86 989 struct sock *sk;
d646960f
SO		 990 u8 dsap, ssap;
991
d646960f
SO		 992 dsap = nfc_llcp_dsap(skb);
993 ssap = nfc_llcp_ssap(skb);
994
a69f32af 995 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
d646960f
SO		 996 if (llcp_sock == NULL) {
997 pr_err("Invalid CC\n");
998 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
999
1000 return;
1001 }
1002
ff353d86 1003 sk = &llcp_sock->sk;
d646960f 1004
a69f32af
SO		 1005 /* Unlink from connecting and link to the client array */
1006 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1007 nfc_llcp_sock_link(&local->sockets, sk);
1008 llcp_sock->dsap = ssap;
1009
7a06e586
SO		 1010 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1011 skb->len - LLCP_HEADER_SIZE);
d646960f 1012
ff353d86
SO		 1013 sk->sk_state = LLCP_CONNECTED;
1014 sk->sk_state_change(sk);
1015
d646960f
SO		 1016 nfc_llcp_sock_put(llcp_sock);
1017}
1018
5c0560b7
SO		 1019static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1020{
1021 struct nfc_llcp_sock *llcp_sock;
1022 struct sock *sk;
1023 u8 dsap, ssap, reason;
1024
1025 dsap = nfc_llcp_dsap(skb);
1026 ssap = nfc_llcp_ssap(skb);
1027 reason = skb->data[2];
1028
1029 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1030
1031 switch (reason) {
1032 case LLCP_DM_NOBOUND:
1033 case LLCP_DM_REJ:
1034 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1035 break;
1036
1037 default:
1038 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1039 break;
1040 }
1041
1042 if (llcp_sock == NULL) {
1043 pr_err("Invalid DM\n");
1044 return;
1045 }
1046
1047 sk = &llcp_sock->sk;
1048
1049 sk->sk_err = ENXIO;
1050 sk->sk_state = LLCP_CLOSED;
1051 sk->sk_state_change(sk);
1052
1053 nfc_llcp_sock_put(llcp_sock);
5c0560b7
SO		 1054}
1055
19cfe584
SO		 1056static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1057 struct sk_buff *skb)
1058{
1059 struct nfc_llcp_sock *llcp_sock;
1060 u8 dsap, ssap, *tlv, type, length, tid, sap;
1061 u16 tlv_len, offset;
1062 char *service_name;
1063 size_t service_name_len;
1064
1065 dsap = nfc_llcp_dsap(skb);
1066 ssap = nfc_llcp_ssap(skb);
1067
1068 pr_debug("%d %d\n", dsap, ssap);
1069
1070 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1071 pr_err("Wrong SNL SAP\n");
1072 return;
1073 }
1074
1075 tlv = &skb->data[LLCP_HEADER_SIZE];
1076 tlv_len = skb->len - LLCP_HEADER_SIZE;
1077 offset = 0;
1078
1079 while(offset < tlv_len) {
1080 type = tlv[0];
1081 length = tlv[1];
1082
1083 switch (type) {
1084 case LLCP_TLV_SDREQ:
1085 tid = tlv[2];
1086 service_name = (char *) &tlv[3];
1087 service_name_len = length - 1;
1088
e6904081 1089 pr_debug("Looking for %.16s\n", service_name);
19cfe584
SO		 1090
1091 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1092 !strncmp(service_name, "urn:nfc:sn:sdp",
1093 service_name_len)) {
1094 sap = 1;
e6904081
SO		 1095 goto send_snl;
1096 }
1097
1098 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1099 service_name_len);
1100 if (!llcp_sock) {
1101 sap = 0;
1102 goto send_snl;
1103 }
1104
1105 /*
1106 * We found a socket but its ssap has not been reserved
1107 * yet. We need to assign it for good and send a reply.
1108 * The ssap will be freed when the socket is closed.
1109 */
1110 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1111 atomic_t *client_count;
1112
1113 sap = nfc_llcp_reserve_sdp_ssap(local);
1114
1115 pr_debug("Reserving %d\n", sap);
1116
1117 if (sap == LLCP_SAP_MAX) {
1118 sap = 0;
1119 goto send_snl;
1120 }
1121
1122 client_count =
1123 &local->local_sdp_cnt[sap -
1124 LLCP_WKS_NUM_SAP];
1125
1126 atomic_inc(client_count);
1127
1128 llcp_sock->ssap = sap;
1129 llcp_sock->reserved_ssap = sap;
19cfe584 1130 } else {
e6904081 1131 sap = llcp_sock->ssap;
19cfe584
SO		 1132 }
1133
e6904081
SO		 1134 pr_debug("%p %d\n", llcp_sock, sap);
1135
1136 send_snl:
19cfe584
SO		 1137 nfc_llcp_send_snl(local, tid, sap);
1138 break;
1139
1140 default:
1141 pr_err("Invalid SNL tlv value 0x%x\n", type);
1142 break;
1143 }
1144
1145 offset += length + 2;
1146 tlv += length + 2;
1147 }
1148}
1149
d646960f
SO		 1150static void nfc_llcp_rx_work(struct work_struct *work)
1151{
1152 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
427a2eb1 1153 rx_work);
d646960f
SO		 1154 u8 dsap, ssap, ptype;
1155 struct sk_buff *skb;
1156
1157 skb = local->rx_pending;
1158 if (skb == NULL) {
1159 pr_debug("No pending SKB\n");
1160 return;
1161 }
1162
1163 ptype = nfc_llcp_ptype(skb);
1164 dsap = nfc_llcp_dsap(skb);
1165 ssap = nfc_llcp_ssap(skb);
1166
1167 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1168
4be646ec
SO		 1169 if (ptype != LLCP_PDU_SYMM)
1170 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1171 16, 1, skb->data, skb->len, true);
1172
4463523b
TE		 1173 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1174
d646960f
SO		 1175 switch (ptype) {
1176 case LLCP_PDU_SYMM:
1177 pr_debug("SYMM\n");
1178 break;
1179
1180 case LLCP_PDU_CONNECT:
1181 pr_debug("CONNECT\n");
1182 nfc_llcp_recv_connect(local, skb);
1183 break;
1184
1185 case LLCP_PDU_DISC:
1186 pr_debug("DISC\n");
1187 nfc_llcp_recv_disc(local, skb);
1188 break;
1189
1190 case LLCP_PDU_CC:
1191 pr_debug("CC\n");
1192 nfc_llcp_recv_cc(local, skb);
1193 break;
1194
5c0560b7
SO		 1195 case LLCP_PDU_DM:
1196 pr_debug("DM\n");
1197 nfc_llcp_recv_dm(local, skb);
1198 break;
1199
19cfe584
SO		 1200 case LLCP_PDU_SNL:
1201 pr_debug("SNL\n");
1202 nfc_llcp_recv_snl(local, skb);
1203 break;
1204
d646960f
SO		 1205 case LLCP_PDU_I:
1206 case LLCP_PDU_RR:
53aef920 1207 case LLCP_PDU_RNR:
d646960f
SO		 1208 pr_debug("I frame\n");
1209 nfc_llcp_recv_hdlc(local, skb);
1210 break;
1211
1212 }
1213
916082b0 1214 schedule_work(&local->tx_work);
d646960f
SO		 1215 kfree_skb(local->rx_pending);
1216 local->rx_pending = NULL;
d646960f
SO		 1217}
1218
1219void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1220{
1221 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1222
1223 pr_debug("Received an LLCP PDU\n");
1224 if (err < 0) {
427a2eb1 1225 pr_err("err %d\n", err);
d646960f
SO		 1226 return;
1227 }
1228
1229 local->rx_pending = skb_get(skb);
1230 del_timer(&local->link_timer);
916082b0 1231 schedule_work(&local->rx_work);
d646960f
SO		 1232}
1233
73167ced
SO		 1234int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1235{
1236 struct nfc_llcp_local *local;
1237
1238 local = nfc_llcp_find_local(dev);
1239 if (local == NULL)
1240 return -ENODEV;
1241
1242 local->rx_pending = skb_get(skb);
1243 del_timer(&local->link_timer);
916082b0 1244 schedule_work(&local->rx_work);
73167ced
SO		 1245
1246 return 0;
1247}
1248
d646960f
SO		 1249void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1250{
1251 struct nfc_llcp_local *local;
1252
1253 local = nfc_llcp_find_local(dev);
1254 if (local == NULL)
1255 return;
1256
1257 /* Close and purge all existing sockets */
4d22ea15 1258 nfc_llcp_socket_release(local, true);
d646960f
SO		 1259}
1260
1261void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1262 u8 comm_mode, u8 rf_mode)
1263{
1264 struct nfc_llcp_local *local;
1265
1266 pr_debug("rf mode %d\n", rf_mode);
1267
1268 local = nfc_llcp_find_local(dev);
1269 if (local == NULL)
1270 return;
1271
1272 local->target_idx = target_idx;
1273 local->comm_mode = comm_mode;
1274 local->rf_mode = rf_mode;
1275
1276 if (rf_mode == NFC_RF_INITIATOR) {
1277 pr_debug("Queueing Tx work\n");
1278
916082b0 1279 schedule_work(&local->tx_work);
d646960f
SO		 1280 } else {
1281 mod_timer(&local->link_timer,
427a2eb1 1282 jiffies + msecs_to_jiffies(local->remote_lto));
d646960f
SO		 1283 }
1284}
1285
1286int nfc_llcp_register_device(struct nfc_dev *ndev)
1287{
d646960f 1288 struct nfc_llcp_local *local;
d646960f
SO		 1289
1290 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1291 if (local == NULL)
1292 return -ENOMEM;
1293
1294 local->dev = ndev;
1295 INIT_LIST_HEAD(&local->list);
c7aa1225 1296 kref_init(&local->ref);
d646960f 1297 mutex_init(&local->sdp_lock);
d646960f
SO		 1298 init_timer(&local->link_timer);
1299 local->link_timer.data = (unsigned long) local;
1300 local->link_timer.function = nfc_llcp_symm_timer;
1301
1302 skb_queue_head_init(&local->tx_queue);
1303 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
d646960f
SO		 1304
1305 local->rx_pending = NULL;
1306 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
d646960f
SO		 1307
1308 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
d646960f 1309
fe235b58
SJ		 1310 rwlock_init(&local->sockets.lock);
1311 rwlock_init(&local->connecting_sockets.lock);
4463523b 1312 rwlock_init(&local->raw_sockets.lock);
a69f32af 1313
d646960f
SO		 1314 nfc_llcp_build_gb(local);
1315
1316 local->remote_miu = LLCP_DEFAULT_MIU;
1317 local->remote_lto = LLCP_DEFAULT_LTO;
d646960f
SO		 1318
1319 list_add(&llcp_devices, &local->list);
1320
d646960f
SO		 1321 return 0;
1322}
1323
1324void nfc_llcp_unregister_device(struct nfc_dev *dev)
1325{
1326 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1327
1328 if (local == NULL) {
1329 pr_debug("No such device\n");
1330 return;
1331 }
1332
c7aa1225 1333 nfc_llcp_local_put(local);
d646960f
SO		 1334}
1335
1336int __init nfc_llcp_init(void)
1337{
1338 INIT_LIST_HEAD(&llcp_devices);
1339
1340 return nfc_llcp_sock_init();
1341}
1342
1343void nfc_llcp_exit(void)
1344{
1345 nfc_llcp_sock_exit();
1346}
kernel source for telekom puls (alcatel/mediatek)