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NFC: Remove CONFIG_EXPERIMENTAL from the NCI Makefile
[linux-2.6-block.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
0f450772
SJ		 68 list_for_each_entry_safe(lsk, n,
69 &llcp_sock->accept_queue,
427a2eb1 70 accept_queue) {
d646960f 71 accept_sk = &lsk->sk;
50b78b2a 72 bh_lock_sock(accept_sk);
d646960f
SO		 73
74 nfc_llcp_accept_unlink(accept_sk);
75
76 accept_sk->sk_state = LLCP_CLOSED;
d646960f 77
50b78b2a 78 bh_unlock_sock(accept_sk);
d646960f
SO		 79
80 sock_orphan(accept_sk);
81 }
4d22ea15
SO		 82
83 if (listen == true) {
50b78b2a 84 bh_unlock_sock(sk);
4d22ea15
SO		 85 continue;
86 }
d646960f
SO		 87 }
88
c8512be6
SO		 89 /*
90 * If we have a connection less socket bound, we keep it alive
91 * if the device is still present.
92 */
93 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
94 listen == true) {
95 bh_unlock_sock(sk);
96 continue;
97 }
98
a69f32af 99 sk->sk_state = LLCP_CLOSED;
d646960f 100
50b78b2a 101 bh_unlock_sock(sk);
d646960f 102
a69f32af 103 sock_orphan(sk);
40c75f81 104
a69f32af 105 sk_del_node_init(sk);
d646960f
SO		 106 }
107
a69f32af 108 write_unlock(&local->sockets.lock);
d646960f
SO		 109}
110
c7aa1225
SO		 111struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
112{
113 kref_get(&local->ref);
114
115 return local;
116}
117
118static void local_release(struct kref *ref)
119{
120 struct nfc_llcp_local *local;
121
122 local = container_of(ref, struct nfc_llcp_local, ref);
123
124 list_del(&local->list);
4d22ea15 125 nfc_llcp_socket_release(local, false);
c7aa1225
SO		 126 del_timer_sync(&local->link_timer);
127 skb_queue_purge(&local->tx_queue);
474fee3d
TH		 128 cancel_work_sync(&local->tx_work);
129 cancel_work_sync(&local->rx_work);
130 cancel_work_sync(&local->timeout_work);
c7aa1225
SO		 131 kfree_skb(local->rx_pending);
132 kfree(local);
133}
134
135int nfc_llcp_local_put(struct nfc_llcp_local *local)
136{
a69f32af
SO		 137 if (local == NULL)
138 return 0;
139
c7aa1225
SO		 140 return kref_put(&local->ref, local_release);
141}
142
8f50020e
SO		 143static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
144 u8 ssap, u8 dsap)
145{
146 struct sock *sk;
147 struct hlist_node *node;
a8df0f37 148 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
8f50020e
SO		 149
150 pr_debug("ssap dsap %d %d\n", ssap, dsap);
151
152 if (ssap == 0 && dsap == 0)
153 return NULL;
154
155 read_lock(&local->sockets.lock);
156
157 llcp_sock = NULL;
158
159 sk_for_each(sk, node, &local->sockets.head) {
a8df0f37 160 tmp_sock = nfc_llcp_sock(sk);
8f50020e 161
a8df0f37
SO		 162 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
163 llcp_sock = tmp_sock;
8f50020e 164 break;
a8df0f37 165 }
8f50020e
SO		 166 }
167
168 read_unlock(&local->sockets.lock);
169
170 if (llcp_sock == NULL)
171 return NULL;
172
173 sock_hold(&llcp_sock->sk);
174
175 return llcp_sock;
176}
177
178static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
179{
180 sock_put(&sock->sk);
181}
182
d646960f
SO		 183static void nfc_llcp_timeout_work(struct work_struct *work)
184{
185 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
427a2eb1 186 timeout_work);
d646960f
SO		 187
188 nfc_dep_link_down(local->dev);
189}
190
191static void nfc_llcp_symm_timer(unsigned long data)
192{
193 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
194
195 pr_err("SYMM timeout\n");
196
916082b0 197 schedule_work(&local->timeout_work);
d646960f
SO		 198}
199
200struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
201{
202 struct nfc_llcp_local *local, *n;
203
204 list_for_each_entry_safe(local, n, &llcp_devices, list)
205 if (local->dev == dev)
206 return local;
207
208 pr_debug("No device found\n");
209
210 return NULL;
211}
212
213static char *wks[] = {
214 NULL,
215 NULL, /* SDP */
216 "urn:nfc:sn:ip",
217 "urn:nfc:sn:obex",
218 "urn:nfc:sn:snep",
219};
220
221static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
222{
223 int sap, num_wks;
224
225 pr_debug("%s\n", service_name);
226
227 if (service_name == NULL)
228 return -EINVAL;
229
230 num_wks = ARRAY_SIZE(wks);
231
427a2eb1 232 for (sap = 0; sap < num_wks; sap++) {
d646960f
SO		 233 if (wks[sap] == NULL)
234 continue;
235
236 if (strncmp(wks[sap], service_name, service_name_len) == 0)
237 return sap;
238 }
239
240 return -EINVAL;
241}
242
8f50020e
SO		 243static
244struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
245 u8 *sn, size_t sn_len)
246{
247 struct sock *sk;
248 struct hlist_node *node;
249 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
250
251 pr_debug("sn %zd %p\n", sn_len, sn);
252
253 if (sn == NULL || sn_len == 0)
254 return NULL;
255
256 read_lock(&local->sockets.lock);
257
258 llcp_sock = NULL;
259
260 sk_for_each(sk, node, &local->sockets.head) {
261 tmp_sock = nfc_llcp_sock(sk);
262
263 pr_debug("llcp sock %p\n", tmp_sock);
264
54292d64
SO		 265 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
266 tmp_sock->sk.sk_state != LLCP_LISTEN)
267 continue;
268
269 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
270 tmp_sock->sk.sk_state != LLCP_BOUND)
8f50020e
SO		 271 continue;
272
273 if (tmp_sock->service_name == NULL ||
274 tmp_sock->service_name_len == 0)
275 continue;
276
277 if (tmp_sock->service_name_len != sn_len)
278 continue;
279
280 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
281 llcp_sock = tmp_sock;
282 break;
283 }
284 }
285
286 read_unlock(&local->sockets.lock);
287
288 pr_debug("Found llcp sock %p\n", llcp_sock);
289
290 return llcp_sock;
291}
292
d646960f 293u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
427a2eb1 294 struct nfc_llcp_sock *sock)
d646960f
SO		 295{
296 mutex_lock(&local->sdp_lock);
297
298 if (sock->service_name != NULL && sock->service_name_len > 0) {
299 int ssap = nfc_llcp_wks_sap(sock->service_name,
427a2eb1 300 sock->service_name_len);
d646960f
SO		 301
302 if (ssap > 0) {
303 pr_debug("WKS %d\n", ssap);
304
305 /* This is a WKS, let's check if it's free */
306 if (local->local_wks & BIT(ssap)) {
307 mutex_unlock(&local->sdp_lock);
308
309 return LLCP_SAP_MAX;
310 }
311
1762c17c 312 set_bit(ssap, &local->local_wks);
d646960f
SO		 313 mutex_unlock(&local->sdp_lock);
314
315 return ssap;
316 }
317
318 /*
8f50020e
SO		 319 * Check if there already is a non WKS socket bound
320 * to this service name.
d646960f 321 */
8f50020e
SO		 322 if (nfc_llcp_sock_from_sn(local, sock->service_name,
323 sock->service_name_len) != NULL) {
d646960f
SO		 324 mutex_unlock(&local->sdp_lock);
325
326 return LLCP_SAP_MAX;
327 }
328
d646960f
SO		 329 mutex_unlock(&local->sdp_lock);
330
8f50020e 331 return LLCP_SDP_UNBOUND;
d646960f 332
ebbb16d9
SO		 333 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
334 if (!test_bit(sock->ssap, &local->local_wks)) {
335 set_bit(sock->ssap, &local->local_wks);
336 mutex_unlock(&local->sdp_lock);
d646960f 337
ebbb16d9 338 return sock->ssap;
d646960f
SO		 339 }
340 }
341
342 mutex_unlock(&local->sdp_lock);
343
344 return LLCP_SAP_MAX;
345}
346
347u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
348{
349 u8 local_ssap;
350
351 mutex_lock(&local->sdp_lock);
352
353 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
354 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
355 mutex_unlock(&local->sdp_lock);
356 return LLCP_SAP_MAX;
357 }
358
1762c17c 359 set_bit(local_ssap, &local->local_sap);
d646960f
SO		 360
361 mutex_unlock(&local->sdp_lock);
362
363 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
364}
365
366void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
367{
368 u8 local_ssap;
369 unsigned long *sdp;
370
371 if (ssap < LLCP_WKS_NUM_SAP) {
372 local_ssap = ssap;
373 sdp = &local->local_wks;
374 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
8f50020e
SO		 375 atomic_t *client_cnt;
376
d646960f
SO		 377 local_ssap = ssap - LLCP_WKS_NUM_SAP;
378 sdp = &local->local_sdp;
8f50020e
SO		 379 client_cnt = &local->local_sdp_cnt[local_ssap];
380
381 pr_debug("%d clients\n", atomic_read(client_cnt));
382
383 mutex_lock(&local->sdp_lock);
384
385 if (atomic_dec_and_test(client_cnt)) {
386 struct nfc_llcp_sock *l_sock;
387
388 pr_debug("No more clients for SAP %d\n", ssap);
389
390 clear_bit(local_ssap, sdp);
391
392 /* Find the listening sock and set it back to UNBOUND */
393 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
394 if (l_sock) {
395 l_sock->ssap = LLCP_SDP_UNBOUND;
396 nfc_llcp_sock_put(l_sock);
397 }
398 }
399
400 mutex_unlock(&local->sdp_lock);
401
402 return;
d646960f
SO		 403 } else if (ssap < LLCP_MAX_SAP) {
404 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
405 sdp = &local->local_sap;
406 } else {
407 return;
408 }
409
410 mutex_lock(&local->sdp_lock);
411
1762c17c 412 clear_bit(local_ssap, sdp);
d646960f
SO		 413
414 mutex_unlock(&local->sdp_lock);
415}
416
8f50020e
SO		 417static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
418{
419 u8 ssap;
420
421 mutex_lock(&local->sdp_lock);
422
423 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
424 if (ssap == LLCP_SDP_NUM_SAP) {
425 mutex_unlock(&local->sdp_lock);
426
427 return LLCP_SAP_MAX;
428 }
429
430 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
431
432 set_bit(ssap, &local->local_sdp);
433
434 mutex_unlock(&local->sdp_lock);
435
436 return LLCP_WKS_NUM_SAP + ssap;
437}
438
d646960f
SO		 439static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
440{
441 u8 *gb_cur, *version_tlv, version, version_length;
442 u8 *lto_tlv, lto, lto_length;
443 u8 *wks_tlv, wks_length;
56d5876a
SO		 444 u8 *miux_tlv, miux_length;
445 __be16 miux;
d646960f 446 u8 gb_len = 0;
52da2449 447 int ret = 0;
d646960f
SO		 448
449 version = LLCP_VERSION_11;
450 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
427a2eb1 451 1, &version_length);
d646960f
SO		 452 gb_len += version_length;
453
454 /* 1500 ms */
455 lto = 150;
91b0ade1 456 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &lto, 1, &lto_length);
d646960f
SO		 457 gb_len += lto_length;
458
459 pr_debug("Local wks 0x%lx\n", local->local_wks);
460 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
427a2eb1 461 &wks_length);
d646960f
SO		 462 gb_len += wks_length;
463
56d5876a
SO		 464 miux = cpu_to_be16(LLCP_MAX_MIUX);
465 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
466 &miux_length);
467 gb_len += miux_length;
468
d646960f
SO		 469 gb_len += ARRAY_SIZE(llcp_magic);
470
471 if (gb_len > NFC_MAX_GT_LEN) {
52da2449
WY		 472 ret = -EINVAL;
473 goto out;
d646960f
SO		 474 }
475
476 gb_cur = local->gb;
477
478 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
479 gb_cur += ARRAY_SIZE(llcp_magic);
480
481 memcpy(gb_cur, version_tlv, version_length);
482 gb_cur += version_length;
483
484 memcpy(gb_cur, lto_tlv, lto_length);
485 gb_cur += lto_length;
486
487 memcpy(gb_cur, wks_tlv, wks_length);
488 gb_cur += wks_length;
489
56d5876a
SO		 490 memcpy(gb_cur, miux_tlv, miux_length);
491 gb_cur += miux_length;
492
52da2449
WY		 493 local->gb_len = gb_len;
494
495out:
d646960f
SO		 496 kfree(version_tlv);
497 kfree(lto_tlv);
52da2449
WY		 498 kfree(wks_tlv);
499 kfree(miux_tlv);
d646960f 500
52da2449 501 return ret;
d646960f
SO		 502}
503
b8e7a06d
SO		 504u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
505{
506 struct nfc_llcp_local *local;
507
508 local = nfc_llcp_find_local(dev);
509 if (local == NULL) {
510 *general_bytes_len = 0;
511 return NULL;
512 }
513
514 nfc_llcp_build_gb(local);
515
516 *general_bytes_len = local->gb_len;
517
518 return local->gb;
519}
520
d646960f
SO		 521int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
522{
523 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
524
525 if (local == NULL) {
526 pr_err("No LLCP device\n");
527 return -ENODEV;
528 }
529
530 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
531 memcpy(local->remote_gb, gb, gb_len);
532 local->remote_gb_len = gb_len;
533
427a2eb1 534 if (local->remote_gb == NULL || local->remote_gb_len == 0)
d646960f
SO		 535 return -ENODEV;
536
537 if (memcmp(local->remote_gb, llcp_magic, 3)) {
538 pr_err("MAC does not support LLCP\n");
539 return -EINVAL;
540 }
541
7a06e586
SO		 542 return nfc_llcp_parse_gb_tlv(local,
543 &local->remote_gb[3],
544 local->remote_gb_len - 3);
d646960f
SO		 545}
546
d646960f
SO		 547static u8 nfc_llcp_dsap(struct sk_buff *pdu)
548{
549 return (pdu->data[0] & 0xfc) >> 2;
550}
551
552static u8 nfc_llcp_ptype(struct sk_buff *pdu)
553{
554 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
555}
556
557static u8 nfc_llcp_ssap(struct sk_buff *pdu)
558{
559 return pdu->data[1] & 0x3f;
560}
561
562static u8 nfc_llcp_ns(struct sk_buff *pdu)
563{
564 return pdu->data[2] >> 4;
565}
566
567static u8 nfc_llcp_nr(struct sk_buff *pdu)
568{
569 return pdu->data[2] & 0xf;
570}
571
572static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
573{
279cf174 574 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
d646960f
SO		 575 sock->send_n = (sock->send_n + 1) % 16;
576 sock->recv_ack_n = (sock->recv_n - 1) % 16;
577}
578
4463523b
TE		 579void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
580 struct sk_buff *skb, u8 direction)
581{
582 struct hlist_node *node;
583 struct sk_buff *skb_copy = NULL, *nskb;
584 struct sock *sk;
585 u8 *data;
586
587 read_lock(&local->raw_sockets.lock);
588
589 sk_for_each(sk, node, &local->raw_sockets.head) {
590 if (sk->sk_state != LLCP_BOUND)
591 continue;
592
593 if (skb_copy == NULL) {
594 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
595 GFP_ATOMIC);
596
597 if (skb_copy == NULL)
598 continue;
599
600 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
601
602 data[0] = local->dev ? local->dev->idx : 0xFF;
603 data[1] = direction;
604 }
605
606 nskb = skb_clone(skb_copy, GFP_ATOMIC);
607 if (!nskb)
608 continue;
609
610 if (sock_queue_rcv_skb(sk, nskb))
611 kfree_skb(nskb);
612 }
613
614 read_unlock(&local->raw_sockets.lock);
615
616 kfree_skb(skb_copy);
617}
618
84457960
SO		 619static void nfc_llcp_tx_work(struct work_struct *work)
620{
621 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
622 tx_work);
623 struct sk_buff *skb;
624 struct sock *sk;
625 struct nfc_llcp_sock *llcp_sock;
626
627 skb = skb_dequeue(&local->tx_queue);
628 if (skb != NULL) {
629 sk = skb->sk;
630 llcp_sock = nfc_llcp_sock(sk);
a6a0915f
SO		 631
632 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
633 nfc_llcp_send_symm(local->dev);
634 } else {
84457960
SO		 635 int ret;
636
637 pr_debug("Sending pending skb\n");
638 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
639 DUMP_PREFIX_OFFSET, 16, 1,
640 skb->data, skb->len, true);
641
4463523b
TE		 642 nfc_llcp_send_to_raw_sock(local, skb,
643 NFC_LLCP_DIRECTION_TX);
644
84457960
SO		 645 ret = nfc_data_exchange(local->dev, local->target_idx,
646 skb, nfc_llcp_recv, local);
647
648 if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
649 skb = skb_get(skb);
650 skb_queue_tail(&llcp_sock->tx_pending_queue,
651 skb);
652 }
84457960
SO		 653 }
654 } else {
655 nfc_llcp_send_symm(local->dev);
656 }
657
658 mod_timer(&local->link_timer,
659 jiffies + msecs_to_jiffies(2 * local->remote_lto));
660}
661
a69f32af
SO		 662static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
663 u8 ssap)
664{
665 struct sock *sk;
666 struct nfc_llcp_sock *llcp_sock;
667 struct hlist_node *node;
668
669 read_lock(&local->connecting_sockets.lock);
670
671 sk_for_each(sk, node, &local->connecting_sockets.head) {
672 llcp_sock = nfc_llcp_sock(sk);
673
5a0f6f3b
SO		 674 if (llcp_sock->ssap == ssap) {
675 sock_hold(&llcp_sock->sk);
a69f32af 676 goto out;
5a0f6f3b 677 }
a69f32af
SO		 678 }
679
680 llcp_sock = NULL;
681
682out:
683 read_unlock(&local->connecting_sockets.lock);
684
a69f32af
SO		 685 return llcp_sock;
686}
687
a69f32af
SO		 688static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
689 u8 *sn, size_t sn_len)
690{
a69f32af
SO		 691 struct nfc_llcp_sock *llcp_sock;
692
8f50020e 693 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
d646960f 694
a69f32af
SO		 695 if (llcp_sock == NULL)
696 return NULL;
d646960f 697
a69f32af
SO		 698 sock_hold(&llcp_sock->sk);
699
700 return llcp_sock;
d646960f
SO		 701}
702
d646960f
SO		 703static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
704{
705 u8 *tlv = &skb->data[2], type, length;
706 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
707
708 while (offset < tlv_array_len) {
709 type = tlv[0];
710 length = tlv[1];
711
712 pr_debug("type 0x%x length %d\n", type, length);
713
714 if (type == LLCP_TLV_SN) {
715 *sn_len = length;
716 return &tlv[2];
717 }
718
719 offset += length + 2;
720 tlv += length + 2;
721 }
722
723 return NULL;
724}
725
968272bf
SO		 726static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
727 struct sk_buff *skb)
728{
729 struct nfc_llcp_sock *llcp_sock;
730 struct nfc_llcp_ui_cb *ui_cb;
731 u8 dsap, ssap;
732
733 dsap = nfc_llcp_dsap(skb);
734 ssap = nfc_llcp_ssap(skb);
735
736 ui_cb = nfc_llcp_ui_skb_cb(skb);
737 ui_cb->dsap = dsap;
738 ui_cb->ssap = ssap;
739
740 printk("%s %d %d\n", __func__, dsap, ssap);
741
742 pr_debug("%d %d\n", dsap, ssap);
743
744 /* We're looking for a bound socket, not a client one */
745 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
746 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
747 return;
748
749 /* There is no sequence with UI frames */
750 skb_pull(skb, LLCP_HEADER_SIZE);
751 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
752 pr_err("receive queue is full\n");
753 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
754 }
755
756 nfc_llcp_sock_put(llcp_sock);
757}
758
d646960f 759static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
427a2eb1 760 struct sk_buff *skb)
d646960f
SO		 761{
762 struct sock *new_sk, *parent;
763 struct nfc_llcp_sock *sock, *new_sock;
a69f32af 764 u8 dsap, ssap, reason;
d646960f
SO		 765
766 dsap = nfc_llcp_dsap(skb);
767 ssap = nfc_llcp_ssap(skb);
768
769 pr_debug("%d %d\n", dsap, ssap);
770
d646960f 771 if (dsap != LLCP_SAP_SDP) {
a69f32af
SO		 772 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
773 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
d646960f
SO		 774 reason = LLCP_DM_NOBOUND;
775 goto fail;
776 }
d646960f
SO		 777 } else {
778 u8 *sn;
779 size_t sn_len;
780
781 sn = nfc_llcp_connect_sn(skb, &sn_len);
782 if (sn == NULL) {
783 reason = LLCP_DM_NOBOUND;
784 goto fail;
785 }
786
787 pr_debug("Service name length %zu\n", sn_len);
788
a69f32af
SO		 789 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
790 if (sock == NULL) {
791 reason = LLCP_DM_NOBOUND;
792 goto fail;
d646960f 793 }
d646960f
SO		 794 }
795
a69f32af 796 lock_sock(&sock->sk);
d646960f 797
d646960f
SO		 798 parent = &sock->sk;
799
800 if (sk_acceptq_is_full(parent)) {
801 reason = LLCP_DM_REJ;
802 release_sock(&sock->sk);
803 sock_put(&sock->sk);
804 goto fail;
805 }
806
8f50020e
SO		 807 if (sock->ssap == LLCP_SDP_UNBOUND) {
808 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
809
810 pr_debug("First client, reserving %d\n", ssap);
811
812 if (ssap == LLCP_SAP_MAX) {
813 reason = LLCP_DM_REJ;
814 release_sock(&sock->sk);
815 sock_put(&sock->sk);
816 goto fail;
817 }
818
819 sock->ssap = ssap;
820 }
821
427a2eb1 822 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
d646960f
SO		 823 if (new_sk == NULL) {
824 reason = LLCP_DM_REJ;
825 release_sock(&sock->sk);
826 sock_put(&sock->sk);
827 goto fail;
828 }
829
830 new_sock = nfc_llcp_sock(new_sk);
831 new_sock->dev = local->dev;
c7aa1225 832 new_sock->local = nfc_llcp_local_get(local);
93d7e490 833 new_sock->miu = local->remote_miu;
d646960f 834 new_sock->nfc_protocol = sock->nfc_protocol;
d646960f 835 new_sock->dsap = ssap;
025f1520 836 new_sock->target_idx = local->target_idx;
d646960f 837 new_sock->parent = parent;
8f50020e
SO		 838 new_sock->ssap = sock->ssap;
839 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
840 atomic_t *client_count;
841
842 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
843
844 client_count =
845 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
846
847 atomic_inc(client_count);
848 new_sock->reserved_ssap = sock->ssap;
849 }
d646960f 850
7a06e586
SO		 851 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
852 skb->len - LLCP_HEADER_SIZE);
853
d646960f
SO		 854 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
855
a69f32af 856 nfc_llcp_sock_link(&local->sockets, new_sk);
d646960f
SO		 857
858 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
859
860 nfc_get_device(local->dev->idx);
861
862 new_sk->sk_state = LLCP_CONNECTED;
863
864 /* Wake the listening processes */
865 parent->sk_data_ready(parent, 0);
866
867 /* Send CC */
868 nfc_llcp_send_cc(new_sock);
869
870 release_sock(&sock->sk);
871 sock_put(&sock->sk);
872
873 return;
874
875fail:
876 /* Send DM */
877 nfc_llcp_send_dm(local, dsap, ssap, reason);
d646960f
SO		 878}
879
d094afa1 880int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
4722d2b7 881{
d094afa1 882 int nr_frames = 0;
4722d2b7
SO		 883 struct nfc_llcp_local *local = sock->local;
884
885 pr_debug("Remote ready %d tx queue len %d remote rw %d",
427a2eb1 886 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
7a06e586 887 sock->rw);
4722d2b7
SO		 888
889 /* Try to queue some I frames for transmission */
890 while (sock->remote_ready &&
7a06e586 891 skb_queue_len(&sock->tx_pending_queue) < sock->rw) {
84457960 892 struct sk_buff *pdu;
4722d2b7
SO		 893
894 pdu = skb_dequeue(&sock->tx_queue);
895 if (pdu == NULL)
896 break;
897
898 /* Update N(S)/N(R) */
899 nfc_llcp_set_nrns(sock, pdu);
900
4722d2b7 901 skb_queue_tail(&local->tx_queue, pdu);
d094afa1 902 nr_frames++;
4722d2b7 903 }
d094afa1
SO		 904
905 return nr_frames;
4722d2b7
SO		 906}
907
d646960f 908static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
427a2eb1 909 struct sk_buff *skb)
d646960f
SO		 910{
911 struct nfc_llcp_sock *llcp_sock;
912 struct sock *sk;
913 u8 dsap, ssap, ptype, ns, nr;
914
915 ptype = nfc_llcp_ptype(skb);
916 dsap = nfc_llcp_dsap(skb);
917 ssap = nfc_llcp_ssap(skb);
918 ns = nfc_llcp_ns(skb);
919 nr = nfc_llcp_nr(skb);
920
921 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
922
923 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
924 if (llcp_sock == NULL) {
925 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
926 return;
927 }
928
929 sk = &llcp_sock->sk;
930 lock_sock(sk);
931 if (sk->sk_state == LLCP_CLOSED) {
932 release_sock(sk);
933 nfc_llcp_sock_put(llcp_sock);
934 }
935
d646960f
SO		 936 /* Pass the payload upstream */
937 if (ptype == LLCP_PDU_I) {
938 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
939
53aef920
SO		 940 if (ns == llcp_sock->recv_n)
941 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
942 else
943 pr_err("Received out of sequence I PDU\n");
944
d646960f
SO		 945 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
946 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
947 pr_err("receive queue is full\n");
948 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
949 }
950 }
951
952 /* Remove skbs from the pending queue */
953 if (llcp_sock->send_ack_n != nr) {
954 struct sk_buff *s, *tmp;
955
956 llcp_sock->send_ack_n = nr;
957
84457960
SO		 958 /* Remove and free all skbs until ns == nr */
959 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
960 skb_unlink(s, &llcp_sock->tx_pending_queue);
961 kfree_skb(s);
962
963 if (nfc_llcp_ns(s) == nr)
964 break;
965 }
966
967 /* Re-queue the remaining skbs for transmission */
968 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
969 s, tmp) {
970 skb_unlink(s, &llcp_sock->tx_pending_queue);
971 skb_queue_head(&local->tx_queue, s);
972 }
d646960f
SO		 973 }
974
53aef920
SO		 975 if (ptype == LLCP_PDU_RR)
976 llcp_sock->remote_ready = true;
427a2eb1 977 else if (ptype == LLCP_PDU_RNR)
53aef920
SO		 978 llcp_sock->remote_ready = false;
979
56af2568 980 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
d094afa1 981 nfc_llcp_send_rr(llcp_sock);
d646960f
SO		 982
983 release_sock(sk);
984 nfc_llcp_sock_put(llcp_sock);
985}
986
987static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
427a2eb1 988 struct sk_buff *skb)
d646960f
SO		 989{
990 struct nfc_llcp_sock *llcp_sock;
991 struct sock *sk;
992 u8 dsap, ssap;
993
994 dsap = nfc_llcp_dsap(skb);
995 ssap = nfc_llcp_ssap(skb);
996
997 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
998 if (llcp_sock == NULL) {
999 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1000 return;
1001 }
1002
1003 sk = &llcp_sock->sk;
1004 lock_sock(sk);
1005 if (sk->sk_state == LLCP_CLOSED) {
1006 release_sock(sk);
1007 nfc_llcp_sock_put(llcp_sock);
1008 }
1009
d646960f
SO		 1010 if (sk->sk_state == LLCP_CONNECTED) {
1011 nfc_put_device(local->dev);
1012 sk->sk_state = LLCP_CLOSED;
1013 sk->sk_state_change(sk);
1014 }
1015
1016 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1017
1018 release_sock(sk);
1019 nfc_llcp_sock_put(llcp_sock);
1020}
1021
427a2eb1 1022static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
d646960f
SO		 1023{
1024 struct nfc_llcp_sock *llcp_sock;
ff353d86 1025 struct sock *sk;
d646960f
SO		 1026 u8 dsap, ssap;
1027
d646960f
SO		 1028 dsap = nfc_llcp_dsap(skb);
1029 ssap = nfc_llcp_ssap(skb);
1030
a69f32af 1031 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
d646960f
SO		 1032 if (llcp_sock == NULL) {
1033 pr_err("Invalid CC\n");
1034 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1035
1036 return;
1037 }
1038
ff353d86 1039 sk = &llcp_sock->sk;
d646960f 1040
a69f32af
SO		 1041 /* Unlink from connecting and link to the client array */
1042 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1043 nfc_llcp_sock_link(&local->sockets, sk);
1044 llcp_sock->dsap = ssap;
1045
7a06e586
SO		 1046 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1047 skb->len - LLCP_HEADER_SIZE);
d646960f 1048
ff353d86
SO		 1049 sk->sk_state = LLCP_CONNECTED;
1050 sk->sk_state_change(sk);
1051
d646960f
SO		 1052 nfc_llcp_sock_put(llcp_sock);
1053}
1054
5c0560b7
SO		 1055static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1056{
1057 struct nfc_llcp_sock *llcp_sock;
1058 struct sock *sk;
1059 u8 dsap, ssap, reason;
1060
1061 dsap = nfc_llcp_dsap(skb);
1062 ssap = nfc_llcp_ssap(skb);
1063 reason = skb->data[2];
1064
1065 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1066
1067 switch (reason) {
1068 case LLCP_DM_NOBOUND:
1069 case LLCP_DM_REJ:
1070 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1071 break;
1072
1073 default:
1074 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1075 break;
1076 }
1077
1078 if (llcp_sock == NULL) {
a8df0f37 1079 pr_debug("Already closed\n");
5c0560b7
SO		 1080 return;
1081 }
1082
1083 sk = &llcp_sock->sk;
1084
1085 sk->sk_err = ENXIO;
1086 sk->sk_state = LLCP_CLOSED;
1087 sk->sk_state_change(sk);
1088
1089 nfc_llcp_sock_put(llcp_sock);
5c0560b7
SO		 1090}
1091
19cfe584
SO		 1092static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1093 struct sk_buff *skb)
1094{
1095 struct nfc_llcp_sock *llcp_sock;
1096 u8 dsap, ssap, *tlv, type, length, tid, sap;
1097 u16 tlv_len, offset;
1098 char *service_name;
1099 size_t service_name_len;
1100
1101 dsap = nfc_llcp_dsap(skb);
1102 ssap = nfc_llcp_ssap(skb);
1103
1104 pr_debug("%d %d\n", dsap, ssap);
1105
1106 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1107 pr_err("Wrong SNL SAP\n");
1108 return;
1109 }
1110
1111 tlv = &skb->data[LLCP_HEADER_SIZE];
1112 tlv_len = skb->len - LLCP_HEADER_SIZE;
1113 offset = 0;
1114
0f450772 1115 while (offset < tlv_len) {
19cfe584
SO		 1116 type = tlv[0];
1117 length = tlv[1];
1118
1119 switch (type) {
1120 case LLCP_TLV_SDREQ:
1121 tid = tlv[2];
1122 service_name = (char *) &tlv[3];
1123 service_name_len = length - 1;
1124
e6904081 1125 pr_debug("Looking for %.16s\n", service_name);
19cfe584
SO		 1126
1127 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1128 !strncmp(service_name, "urn:nfc:sn:sdp",
1129 service_name_len)) {
1130 sap = 1;
e6904081
SO		 1131 goto send_snl;
1132 }
1133
1134 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1135 service_name_len);
1136 if (!llcp_sock) {
1137 sap = 0;
1138 goto send_snl;
1139 }
1140
1141 /*
1142 * We found a socket but its ssap has not been reserved
1143 * yet. We need to assign it for good and send a reply.
1144 * The ssap will be freed when the socket is closed.
1145 */
1146 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1147 atomic_t *client_count;
1148
1149 sap = nfc_llcp_reserve_sdp_ssap(local);
1150
1151 pr_debug("Reserving %d\n", sap);
1152
1153 if (sap == LLCP_SAP_MAX) {
1154 sap = 0;
1155 goto send_snl;
1156 }
1157
1158 client_count =
1159 &local->local_sdp_cnt[sap -
1160 LLCP_WKS_NUM_SAP];
1161
1162 atomic_inc(client_count);
1163
1164 llcp_sock->ssap = sap;
1165 llcp_sock->reserved_ssap = sap;
19cfe584 1166 } else {
e6904081 1167 sap = llcp_sock->ssap;
19cfe584
SO		 1168 }
1169
e6904081
SO		 1170 pr_debug("%p %d\n", llcp_sock, sap);
1171
0f450772 1172send_snl:
19cfe584
SO		 1173 nfc_llcp_send_snl(local, tid, sap);
1174 break;
1175
1176 default:
1177 pr_err("Invalid SNL tlv value 0x%x\n", type);
1178 break;
1179 }
1180
1181 offset += length + 2;
1182 tlv += length + 2;
1183 }
1184}
1185
d646960f
SO		 1186static void nfc_llcp_rx_work(struct work_struct *work)
1187{
1188 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
427a2eb1 1189 rx_work);
d646960f
SO		 1190 u8 dsap, ssap, ptype;
1191 struct sk_buff *skb;
1192
1193 skb = local->rx_pending;
1194 if (skb == NULL) {
1195 pr_debug("No pending SKB\n");
1196 return;
1197 }
1198
1199 ptype = nfc_llcp_ptype(skb);
1200 dsap = nfc_llcp_dsap(skb);
1201 ssap = nfc_llcp_ssap(skb);
1202
1203 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1204
4be646ec
SO		 1205 if (ptype != LLCP_PDU_SYMM)
1206 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1207 16, 1, skb->data, skb->len, true);
1208
4463523b
TE		 1209 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1210
d646960f
SO		 1211 switch (ptype) {
1212 case LLCP_PDU_SYMM:
1213 pr_debug("SYMM\n");
1214 break;
1215
968272bf
SO		 1216 case LLCP_PDU_UI:
1217 pr_debug("UI\n");
1218 nfc_llcp_recv_ui(local, skb);
1219 break;
1220
d646960f
SO		 1221 case LLCP_PDU_CONNECT:
1222 pr_debug("CONNECT\n");
1223 nfc_llcp_recv_connect(local, skb);
1224 break;
1225
1226 case LLCP_PDU_DISC:
1227 pr_debug("DISC\n");
1228 nfc_llcp_recv_disc(local, skb);
1229 break;
1230
1231 case LLCP_PDU_CC:
1232 pr_debug("CC\n");
1233 nfc_llcp_recv_cc(local, skb);
1234 break;
1235
5c0560b7
SO		 1236 case LLCP_PDU_DM:
1237 pr_debug("DM\n");
1238 nfc_llcp_recv_dm(local, skb);
1239 break;
1240
19cfe584
SO		 1241 case LLCP_PDU_SNL:
1242 pr_debug("SNL\n");
1243 nfc_llcp_recv_snl(local, skb);
1244 break;
1245
d646960f
SO		 1246 case LLCP_PDU_I:
1247 case LLCP_PDU_RR:
53aef920 1248 case LLCP_PDU_RNR:
d646960f
SO		 1249 pr_debug("I frame\n");
1250 nfc_llcp_recv_hdlc(local, skb);
1251 break;
1252
1253 }
1254
916082b0 1255 schedule_work(&local->tx_work);
d646960f
SO		 1256 kfree_skb(local->rx_pending);
1257 local->rx_pending = NULL;
d646960f
SO		 1258}
1259
1260void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1261{
1262 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1263
1264 pr_debug("Received an LLCP PDU\n");
1265 if (err < 0) {
427a2eb1 1266 pr_err("err %d\n", err);
d646960f
SO		 1267 return;
1268 }
1269
1270 local->rx_pending = skb_get(skb);
1271 del_timer(&local->link_timer);
916082b0 1272 schedule_work(&local->rx_work);
d646960f
SO		 1273}
1274
73167ced
SO		 1275int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1276{
1277 struct nfc_llcp_local *local;
1278
1279 local = nfc_llcp_find_local(dev);
1280 if (local == NULL)
1281 return -ENODEV;
1282
1283 local->rx_pending = skb_get(skb);
1284 del_timer(&local->link_timer);
916082b0 1285 schedule_work(&local->rx_work);
73167ced
SO		 1286
1287 return 0;
1288}
1289
d646960f
SO		 1290void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1291{
1292 struct nfc_llcp_local *local;
1293
1294 local = nfc_llcp_find_local(dev);
1295 if (local == NULL)
1296 return;
1297
1298 /* Close and purge all existing sockets */
4d22ea15 1299 nfc_llcp_socket_release(local, true);
d646960f
SO		 1300}
1301
1302void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1303 u8 comm_mode, u8 rf_mode)
1304{
1305 struct nfc_llcp_local *local;
1306
1307 pr_debug("rf mode %d\n", rf_mode);
1308
1309 local = nfc_llcp_find_local(dev);
1310 if (local == NULL)
1311 return;
1312
1313 local->target_idx = target_idx;
1314 local->comm_mode = comm_mode;
1315 local->rf_mode = rf_mode;
1316
1317 if (rf_mode == NFC_RF_INITIATOR) {
1318 pr_debug("Queueing Tx work\n");
1319
916082b0 1320 schedule_work(&local->tx_work);
d646960f
SO		 1321 } else {
1322 mod_timer(&local->link_timer,
427a2eb1 1323 jiffies + msecs_to_jiffies(local->remote_lto));
d646960f
SO		 1324 }
1325}
1326
1327int nfc_llcp_register_device(struct nfc_dev *ndev)
1328{
d646960f 1329 struct nfc_llcp_local *local;
d646960f
SO		 1330
1331 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1332 if (local == NULL)
1333 return -ENOMEM;
1334
1335 local->dev = ndev;
1336 INIT_LIST_HEAD(&local->list);
c7aa1225 1337 kref_init(&local->ref);
d646960f 1338 mutex_init(&local->sdp_lock);
d646960f
SO		 1339 init_timer(&local->link_timer);
1340 local->link_timer.data = (unsigned long) local;
1341 local->link_timer.function = nfc_llcp_symm_timer;
1342
1343 skb_queue_head_init(&local->tx_queue);
1344 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
d646960f
SO		 1345
1346 local->rx_pending = NULL;
1347 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
d646960f
SO		 1348
1349 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
d646960f 1350
fe235b58
SJ		 1351 rwlock_init(&local->sockets.lock);
1352 rwlock_init(&local->connecting_sockets.lock);
4463523b 1353 rwlock_init(&local->raw_sockets.lock);
a69f32af 1354
d646960f
SO		 1355 nfc_llcp_build_gb(local);
1356
1357 local->remote_miu = LLCP_DEFAULT_MIU;
1358 local->remote_lto = LLCP_DEFAULT_LTO;
d646960f
SO		 1359
1360 list_add(&llcp_devices, &local->list);
1361
d646960f
SO		 1362 return 0;
1363}
1364
1365void nfc_llcp_unregister_device(struct nfc_dev *dev)
1366{
1367 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1368
1369 if (local == NULL) {
1370 pr_debug("No such device\n");
1371 return;
1372 }
1373
c7aa1225 1374 nfc_llcp_local_put(local);
d646960f
SO		 1375}
1376
1377int __init nfc_llcp_init(void)
1378{
1379 INIT_LIST_HEAD(&llcp_devices);
1380
1381 return nfc_llcp_sock_init();
1382}
1383
1384void nfc_llcp_exit(void)
1385{
1386 nfc_llcp_sock_exit();
1387}
Linux 6.x block layer and io_uring tree(s)