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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless
[deliverable/linux.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 del_timer_sync(&local->sdreq_timer);
192 cancel_work_sync(&local->sdreq_timeout_work);
193 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
194 }
195
196 static void local_release(struct kref *ref)
197 {
198 struct nfc_llcp_local *local;
199
200 local = container_of(ref, struct nfc_llcp_local, ref);
201
202 list_del(&local->list);
203 local_cleanup(local, false);
204 kfree(local);
205 }
206
207 int nfc_llcp_local_put(struct nfc_llcp_local *local)
208 {
209 if (local == NULL)
210 return 0;
211
212 return kref_put(&local->ref, local_release);
213 }
214
215 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
216 u8 ssap, u8 dsap)
217 {
218 struct sock *sk;
219 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
220
221 pr_debug("ssap dsap %d %d\n", ssap, dsap);
222
223 if (ssap == 0 && dsap == 0)
224 return NULL;
225
226 read_lock(&local->sockets.lock);
227
228 llcp_sock = NULL;
229
230 sk_for_each(sk, &local->sockets.head) {
231 tmp_sock = nfc_llcp_sock(sk);
232
233 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
234 llcp_sock = tmp_sock;
235 break;
236 }
237 }
238
239 read_unlock(&local->sockets.lock);
240
241 if (llcp_sock == NULL)
242 return NULL;
243
244 sock_hold(&llcp_sock->sk);
245
246 return llcp_sock;
247 }
248
249 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
250 {
251 sock_put(&sock->sk);
252 }
253
254 static void nfc_llcp_timeout_work(struct work_struct *work)
255 {
256 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
257 timeout_work);
258
259 nfc_dep_link_down(local->dev);
260 }
261
262 static void nfc_llcp_symm_timer(unsigned long data)
263 {
264 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
265
266 pr_err("SYMM timeout\n");
267
268 schedule_work(&local->timeout_work);
269 }
270
271 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
272 {
273 unsigned long time;
274 HLIST_HEAD(nl_sdres_list);
275 struct hlist_node *n;
276 struct nfc_llcp_sdp_tlv *sdp;
277 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
278 sdreq_timeout_work);
279
280 mutex_lock(&local->sdreq_lock);
281
282 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
283
284 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
285 if (time_after(sdp->time, time))
286 continue;
287
288 sdp->sap = LLCP_SDP_UNBOUND;
289
290 hlist_del(&sdp->node);
291
292 hlist_add_head(&sdp->node, &nl_sdres_list);
293 }
294
295 if (!hlist_empty(&local->pending_sdreqs))
296 mod_timer(&local->sdreq_timer,
297 jiffies + msecs_to_jiffies(3 * local->remote_lto));
298
299 mutex_unlock(&local->sdreq_lock);
300
301 if (!hlist_empty(&nl_sdres_list))
302 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
303 }
304
305 static void nfc_llcp_sdreq_timer(unsigned long data)
306 {
307 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
308
309 schedule_work(&local->sdreq_timeout_work);
310 }
311
312 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
313 {
314 struct nfc_llcp_local *local, *n;
315
316 list_for_each_entry_safe(local, n, &llcp_devices, list)
317 if (local->dev == dev)
318 return local;
319
320 pr_debug("No device found\n");
321
322 return NULL;
323 }
324
325 static char *wks[] = {
326 NULL,
327 NULL, /* SDP */
328 "urn:nfc:sn:ip",
329 "urn:nfc:sn:obex",
330 "urn:nfc:sn:snep",
331 };
332
333 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
334 {
335 int sap, num_wks;
336
337 pr_debug("%s\n", service_name);
338
339 if (service_name == NULL)
340 return -EINVAL;
341
342 num_wks = ARRAY_SIZE(wks);
343
344 for (sap = 0; sap < num_wks; sap++) {
345 if (wks[sap] == NULL)
346 continue;
347
348 if (strncmp(wks[sap], service_name, service_name_len) == 0)
349 return sap;
350 }
351
352 return -EINVAL;
353 }
354
355 static
356 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
357 u8 *sn, size_t sn_len)
358 {
359 struct sock *sk;
360 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
361
362 pr_debug("sn %zd %p\n", sn_len, sn);
363
364 if (sn == NULL || sn_len == 0)
365 return NULL;
366
367 read_lock(&local->sockets.lock);
368
369 llcp_sock = NULL;
370
371 sk_for_each(sk, &local->sockets.head) {
372 tmp_sock = nfc_llcp_sock(sk);
373
374 pr_debug("llcp sock %p\n", tmp_sock);
375
376 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
377 tmp_sock->sk.sk_state != LLCP_LISTEN)
378 continue;
379
380 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
381 tmp_sock->sk.sk_state != LLCP_BOUND)
382 continue;
383
384 if (tmp_sock->service_name == NULL ||
385 tmp_sock->service_name_len == 0)
386 continue;
387
388 if (tmp_sock->service_name_len != sn_len)
389 continue;
390
391 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
392 llcp_sock = tmp_sock;
393 break;
394 }
395 }
396
397 read_unlock(&local->sockets.lock);
398
399 pr_debug("Found llcp sock %p\n", llcp_sock);
400
401 return llcp_sock;
402 }
403
404 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
405 struct nfc_llcp_sock *sock)
406 {
407 mutex_lock(&local->sdp_lock);
408
409 if (sock->service_name != NULL && sock->service_name_len > 0) {
410 int ssap = nfc_llcp_wks_sap(sock->service_name,
411 sock->service_name_len);
412
413 if (ssap > 0) {
414 pr_debug("WKS %d\n", ssap);
415
416 /* This is a WKS, let's check if it's free */
417 if (local->local_wks & BIT(ssap)) {
418 mutex_unlock(&local->sdp_lock);
419
420 return LLCP_SAP_MAX;
421 }
422
423 set_bit(ssap, &local->local_wks);
424 mutex_unlock(&local->sdp_lock);
425
426 return ssap;
427 }
428
429 /*
430 * Check if there already is a non WKS socket bound
431 * to this service name.
432 */
433 if (nfc_llcp_sock_from_sn(local, sock->service_name,
434 sock->service_name_len) != NULL) {
435 mutex_unlock(&local->sdp_lock);
436
437 return LLCP_SAP_MAX;
438 }
439
440 mutex_unlock(&local->sdp_lock);
441
442 return LLCP_SDP_UNBOUND;
443
444 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
445 if (!test_bit(sock->ssap, &local->local_wks)) {
446 set_bit(sock->ssap, &local->local_wks);
447 mutex_unlock(&local->sdp_lock);
448
449 return sock->ssap;
450 }
451 }
452
453 mutex_unlock(&local->sdp_lock);
454
455 return LLCP_SAP_MAX;
456 }
457
458 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
459 {
460 u8 local_ssap;
461
462 mutex_lock(&local->sdp_lock);
463
464 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
465 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
466 mutex_unlock(&local->sdp_lock);
467 return LLCP_SAP_MAX;
468 }
469
470 set_bit(local_ssap, &local->local_sap);
471
472 mutex_unlock(&local->sdp_lock);
473
474 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
475 }
476
477 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
478 {
479 u8 local_ssap;
480 unsigned long *sdp;
481
482 if (ssap < LLCP_WKS_NUM_SAP) {
483 local_ssap = ssap;
484 sdp = &local->local_wks;
485 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
486 atomic_t *client_cnt;
487
488 local_ssap = ssap - LLCP_WKS_NUM_SAP;
489 sdp = &local->local_sdp;
490 client_cnt = &local->local_sdp_cnt[local_ssap];
491
492 pr_debug("%d clients\n", atomic_read(client_cnt));
493
494 mutex_lock(&local->sdp_lock);
495
496 if (atomic_dec_and_test(client_cnt)) {
497 struct nfc_llcp_sock *l_sock;
498
499 pr_debug("No more clients for SAP %d\n", ssap);
500
501 clear_bit(local_ssap, sdp);
502
503 /* Find the listening sock and set it back to UNBOUND */
504 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
505 if (l_sock) {
506 l_sock->ssap = LLCP_SDP_UNBOUND;
507 nfc_llcp_sock_put(l_sock);
508 }
509 }
510
511 mutex_unlock(&local->sdp_lock);
512
513 return;
514 } else if (ssap < LLCP_MAX_SAP) {
515 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
516 sdp = &local->local_sap;
517 } else {
518 return;
519 }
520
521 mutex_lock(&local->sdp_lock);
522
523 clear_bit(local_ssap, sdp);
524
525 mutex_unlock(&local->sdp_lock);
526 }
527
528 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
529 {
530 u8 ssap;
531
532 mutex_lock(&local->sdp_lock);
533
534 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
535 if (ssap == LLCP_SDP_NUM_SAP) {
536 mutex_unlock(&local->sdp_lock);
537
538 return LLCP_SAP_MAX;
539 }
540
541 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
542
543 set_bit(ssap, &local->local_sdp);
544
545 mutex_unlock(&local->sdp_lock);
546
547 return LLCP_WKS_NUM_SAP + ssap;
548 }
549
550 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
551 {
552 u8 *gb_cur, *version_tlv, version, version_length;
553 u8 *lto_tlv, lto_length;
554 u8 *wks_tlv, wks_length;
555 u8 *miux_tlv, miux_length;
556 u8 gb_len = 0;
557 int ret = 0;
558
559 version = LLCP_VERSION_11;
560 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
561 1, &version_length);
562 gb_len += version_length;
563
564 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
565 gb_len += lto_length;
566
567 pr_debug("Local wks 0x%lx\n", local->local_wks);
568 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
569 &wks_length);
570 gb_len += wks_length;
571
572 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
573 &miux_length);
574 gb_len += miux_length;
575
576 gb_len += ARRAY_SIZE(llcp_magic);
577
578 if (gb_len > NFC_MAX_GT_LEN) {
579 ret = -EINVAL;
580 goto out;
581 }
582
583 gb_cur = local->gb;
584
585 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
586 gb_cur += ARRAY_SIZE(llcp_magic);
587
588 memcpy(gb_cur, version_tlv, version_length);
589 gb_cur += version_length;
590
591 memcpy(gb_cur, lto_tlv, lto_length);
592 gb_cur += lto_length;
593
594 memcpy(gb_cur, wks_tlv, wks_length);
595 gb_cur += wks_length;
596
597 memcpy(gb_cur, miux_tlv, miux_length);
598 gb_cur += miux_length;
599
600 local->gb_len = gb_len;
601
602 out:
603 kfree(version_tlv);
604 kfree(lto_tlv);
605 kfree(wks_tlv);
606 kfree(miux_tlv);
607
608 return ret;
609 }
610
611 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
612 {
613 struct nfc_llcp_local *local;
614
615 local = nfc_llcp_find_local(dev);
616 if (local == NULL) {
617 *general_bytes_len = 0;
618 return NULL;
619 }
620
621 nfc_llcp_build_gb(local);
622
623 *general_bytes_len = local->gb_len;
624
625 return local->gb;
626 }
627
628 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
629 {
630 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
631
632 if (local == NULL) {
633 pr_err("No LLCP device\n");
634 return -ENODEV;
635 }
636 if (gb_len < 3)
637 return -EINVAL;
638
639 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
640 memcpy(local->remote_gb, gb, gb_len);
641 local->remote_gb_len = gb_len;
642
643 if (memcmp(local->remote_gb, llcp_magic, 3)) {
644 pr_err("MAC does not support LLCP\n");
645 return -EINVAL;
646 }
647
648 return nfc_llcp_parse_gb_tlv(local,
649 &local->remote_gb[3],
650 local->remote_gb_len - 3);
651 }
652
653 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
654 {
655 return (pdu->data[0] & 0xfc) >> 2;
656 }
657
658 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
659 {
660 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
661 }
662
663 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
664 {
665 return pdu->data[1] & 0x3f;
666 }
667
668 static u8 nfc_llcp_ns(struct sk_buff *pdu)
669 {
670 return pdu->data[2] >> 4;
671 }
672
673 static u8 nfc_llcp_nr(struct sk_buff *pdu)
674 {
675 return pdu->data[2] & 0xf;
676 }
677
678 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
679 {
680 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
681 sock->send_n = (sock->send_n + 1) % 16;
682 sock->recv_ack_n = (sock->recv_n - 1) % 16;
683 }
684
685 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
686 struct sk_buff *skb, u8 direction)
687 {
688 struct sk_buff *skb_copy = NULL, *nskb;
689 struct sock *sk;
690 u8 *data;
691
692 read_lock(&local->raw_sockets.lock);
693
694 sk_for_each(sk, &local->raw_sockets.head) {
695 if (sk->sk_state != LLCP_BOUND)
696 continue;
697
698 if (skb_copy == NULL) {
699 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
700 GFP_ATOMIC);
701
702 if (skb_copy == NULL)
703 continue;
704
705 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
706
707 data[0] = local->dev ? local->dev->idx : 0xFF;
708 data[1] = direction;
709 }
710
711 nskb = skb_clone(skb_copy, GFP_ATOMIC);
712 if (!nskb)
713 continue;
714
715 if (sock_queue_rcv_skb(sk, nskb))
716 kfree_skb(nskb);
717 }
718
719 read_unlock(&local->raw_sockets.lock);
720
721 kfree_skb(skb_copy);
722 }
723
724 static void nfc_llcp_tx_work(struct work_struct *work)
725 {
726 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
727 tx_work);
728 struct sk_buff *skb;
729 struct sock *sk;
730 struct nfc_llcp_sock *llcp_sock;
731
732 skb = skb_dequeue(&local->tx_queue);
733 if (skb != NULL) {
734 sk = skb->sk;
735 llcp_sock = nfc_llcp_sock(sk);
736
737 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
738 nfc_llcp_send_symm(local->dev);
739 } else {
740 struct sk_buff *copy_skb = NULL;
741 u8 ptype = nfc_llcp_ptype(skb);
742 int ret;
743
744 pr_debug("Sending pending skb\n");
745 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
746 DUMP_PREFIX_OFFSET, 16, 1,
747 skb->data, skb->len, true);
748
749 if (ptype == LLCP_PDU_I)
750 copy_skb = skb_copy(skb, GFP_ATOMIC);
751
752 __net_timestamp(skb);
753
754 nfc_llcp_send_to_raw_sock(local, skb,
755 NFC_LLCP_DIRECTION_TX);
756
757 ret = nfc_data_exchange(local->dev, local->target_idx,
758 skb, nfc_llcp_recv, local);
759
760 if (ret) {
761 kfree_skb(copy_skb);
762 goto out;
763 }
764
765 if (ptype == LLCP_PDU_I && copy_skb)
766 skb_queue_tail(&llcp_sock->tx_pending_queue,
767 copy_skb);
768 }
769 } else {
770 nfc_llcp_send_symm(local->dev);
771 }
772
773 out:
774 mod_timer(&local->link_timer,
775 jiffies + msecs_to_jiffies(2 * local->remote_lto));
776 }
777
778 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
779 u8 ssap)
780 {
781 struct sock *sk;
782 struct nfc_llcp_sock *llcp_sock;
783
784 read_lock(&local->connecting_sockets.lock);
785
786 sk_for_each(sk, &local->connecting_sockets.head) {
787 llcp_sock = nfc_llcp_sock(sk);
788
789 if (llcp_sock->ssap == ssap) {
790 sock_hold(&llcp_sock->sk);
791 goto out;
792 }
793 }
794
795 llcp_sock = NULL;
796
797 out:
798 read_unlock(&local->connecting_sockets.lock);
799
800 return llcp_sock;
801 }
802
803 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
804 u8 *sn, size_t sn_len)
805 {
806 struct nfc_llcp_sock *llcp_sock;
807
808 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
809
810 if (llcp_sock == NULL)
811 return NULL;
812
813 sock_hold(&llcp_sock->sk);
814
815 return llcp_sock;
816 }
817
818 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
819 {
820 u8 *tlv = &skb->data[2], type, length;
821 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
822
823 while (offset < tlv_array_len) {
824 type = tlv[0];
825 length = tlv[1];
826
827 pr_debug("type 0x%x length %d\n", type, length);
828
829 if (type == LLCP_TLV_SN) {
830 *sn_len = length;
831 return &tlv[2];
832 }
833
834 offset += length + 2;
835 tlv += length + 2;
836 }
837
838 return NULL;
839 }
840
841 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
842 struct sk_buff *skb)
843 {
844 struct nfc_llcp_sock *llcp_sock;
845 struct nfc_llcp_ui_cb *ui_cb;
846 u8 dsap, ssap;
847
848 dsap = nfc_llcp_dsap(skb);
849 ssap = nfc_llcp_ssap(skb);
850
851 ui_cb = nfc_llcp_ui_skb_cb(skb);
852 ui_cb->dsap = dsap;
853 ui_cb->ssap = ssap;
854
855 pr_debug("%d %d\n", dsap, ssap);
856
857 /* We're looking for a bound socket, not a client one */
858 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
859 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
860 return;
861
862 /* There is no sequence with UI frames */
863 skb_pull(skb, LLCP_HEADER_SIZE);
864 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
865 /*
866 * UI frames will be freed from the socket layer, so we
867 * need to keep them alive until someone receives them.
868 */
869 skb_get(skb);
870 } else {
871 pr_err("Receive queue is full\n");
872 kfree_skb(skb);
873 }
874
875 nfc_llcp_sock_put(llcp_sock);
876 }
877
878 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
879 struct sk_buff *skb)
880 {
881 struct sock *new_sk, *parent;
882 struct nfc_llcp_sock *sock, *new_sock;
883 u8 dsap, ssap, reason;
884
885 dsap = nfc_llcp_dsap(skb);
886 ssap = nfc_llcp_ssap(skb);
887
888 pr_debug("%d %d\n", dsap, ssap);
889
890 if (dsap != LLCP_SAP_SDP) {
891 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
892 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
893 reason = LLCP_DM_NOBOUND;
894 goto fail;
895 }
896 } else {
897 u8 *sn;
898 size_t sn_len;
899
900 sn = nfc_llcp_connect_sn(skb, &sn_len);
901 if (sn == NULL) {
902 reason = LLCP_DM_NOBOUND;
903 goto fail;
904 }
905
906 pr_debug("Service name length %zu\n", sn_len);
907
908 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
909 if (sock == NULL) {
910 reason = LLCP_DM_NOBOUND;
911 goto fail;
912 }
913 }
914
915 lock_sock(&sock->sk);
916
917 parent = &sock->sk;
918
919 if (sk_acceptq_is_full(parent)) {
920 reason = LLCP_DM_REJ;
921 release_sock(&sock->sk);
922 sock_put(&sock->sk);
923 goto fail;
924 }
925
926 if (sock->ssap == LLCP_SDP_UNBOUND) {
927 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
928
929 pr_debug("First client, reserving %d\n", ssap);
930
931 if (ssap == LLCP_SAP_MAX) {
932 reason = LLCP_DM_REJ;
933 release_sock(&sock->sk);
934 sock_put(&sock->sk);
935 goto fail;
936 }
937
938 sock->ssap = ssap;
939 }
940
941 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
942 if (new_sk == NULL) {
943 reason = LLCP_DM_REJ;
944 release_sock(&sock->sk);
945 sock_put(&sock->sk);
946 goto fail;
947 }
948
949 new_sock = nfc_llcp_sock(new_sk);
950 new_sock->dev = local->dev;
951 new_sock->local = nfc_llcp_local_get(local);
952 new_sock->rw = sock->rw;
953 new_sock->miux = sock->miux;
954 new_sock->remote_miu = local->remote_miu;
955 new_sock->nfc_protocol = sock->nfc_protocol;
956 new_sock->dsap = ssap;
957 new_sock->target_idx = local->target_idx;
958 new_sock->parent = parent;
959 new_sock->ssap = sock->ssap;
960 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
961 atomic_t *client_count;
962
963 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
964
965 client_count =
966 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
967
968 atomic_inc(client_count);
969 new_sock->reserved_ssap = sock->ssap;
970 }
971
972 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
973 skb->len - LLCP_HEADER_SIZE);
974
975 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
976
977 nfc_llcp_sock_link(&local->sockets, new_sk);
978
979 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
980
981 nfc_get_device(local->dev->idx);
982
983 new_sk->sk_state = LLCP_CONNECTED;
984
985 /* Wake the listening processes */
986 parent->sk_data_ready(parent, 0);
987
988 /* Send CC */
989 nfc_llcp_send_cc(new_sock);
990
991 release_sock(&sock->sk);
992 sock_put(&sock->sk);
993
994 return;
995
996 fail:
997 /* Send DM */
998 nfc_llcp_send_dm(local, dsap, ssap, reason);
999 }
1000
1001 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1002 {
1003 int nr_frames = 0;
1004 struct nfc_llcp_local *local = sock->local;
1005
1006 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1007 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1008 sock->remote_rw);
1009
1010 /* Try to queue some I frames for transmission */
1011 while (sock->remote_ready &&
1012 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1013 struct sk_buff *pdu;
1014
1015 pdu = skb_dequeue(&sock->tx_queue);
1016 if (pdu == NULL)
1017 break;
1018
1019 /* Update N(S)/N(R) */
1020 nfc_llcp_set_nrns(sock, pdu);
1021
1022 skb_queue_tail(&local->tx_queue, pdu);
1023 nr_frames++;
1024 }
1025
1026 return nr_frames;
1027 }
1028
1029 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1030 struct sk_buff *skb)
1031 {
1032 struct nfc_llcp_sock *llcp_sock;
1033 struct sock *sk;
1034 u8 dsap, ssap, ptype, ns, nr;
1035
1036 ptype = nfc_llcp_ptype(skb);
1037 dsap = nfc_llcp_dsap(skb);
1038 ssap = nfc_llcp_ssap(skb);
1039 ns = nfc_llcp_ns(skb);
1040 nr = nfc_llcp_nr(skb);
1041
1042 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1043
1044 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1045 if (llcp_sock == NULL) {
1046 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1047 return;
1048 }
1049
1050 sk = &llcp_sock->sk;
1051 lock_sock(sk);
1052 if (sk->sk_state == LLCP_CLOSED) {
1053 release_sock(sk);
1054 nfc_llcp_sock_put(llcp_sock);
1055 }
1056
1057 /* Pass the payload upstream */
1058 if (ptype == LLCP_PDU_I) {
1059 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1060
1061 if (ns == llcp_sock->recv_n)
1062 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1063 else
1064 pr_err("Received out of sequence I PDU\n");
1065
1066 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1067 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1068 /*
1069 * I frames will be freed from the socket layer, so we
1070 * need to keep them alive until someone receives them.
1071 */
1072 skb_get(skb);
1073 } else {
1074 pr_err("Receive queue is full\n");
1075 kfree_skb(skb);
1076 }
1077 }
1078
1079 /* Remove skbs from the pending queue */
1080 if (llcp_sock->send_ack_n != nr) {
1081 struct sk_buff *s, *tmp;
1082 u8 n;
1083
1084 llcp_sock->send_ack_n = nr;
1085
1086 /* Remove and free all skbs until ns == nr */
1087 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1088 n = nfc_llcp_ns(s);
1089
1090 skb_unlink(s, &llcp_sock->tx_pending_queue);
1091 kfree_skb(s);
1092
1093 if (n == nr)
1094 break;
1095 }
1096
1097 /* Re-queue the remaining skbs for transmission */
1098 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1099 s, tmp) {
1100 skb_unlink(s, &llcp_sock->tx_pending_queue);
1101 skb_queue_head(&local->tx_queue, s);
1102 }
1103 }
1104
1105 if (ptype == LLCP_PDU_RR)
1106 llcp_sock->remote_ready = true;
1107 else if (ptype == LLCP_PDU_RNR)
1108 llcp_sock->remote_ready = false;
1109
1110 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1111 nfc_llcp_send_rr(llcp_sock);
1112
1113 release_sock(sk);
1114 nfc_llcp_sock_put(llcp_sock);
1115 }
1116
1117 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1118 struct sk_buff *skb)
1119 {
1120 struct nfc_llcp_sock *llcp_sock;
1121 struct sock *sk;
1122 u8 dsap, ssap;
1123
1124 dsap = nfc_llcp_dsap(skb);
1125 ssap = nfc_llcp_ssap(skb);
1126
1127 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1128 if (llcp_sock == NULL) {
1129 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1130 return;
1131 }
1132
1133 sk = &llcp_sock->sk;
1134 lock_sock(sk);
1135
1136 nfc_llcp_socket_purge(llcp_sock);
1137
1138 if (sk->sk_state == LLCP_CLOSED) {
1139 release_sock(sk);
1140 nfc_llcp_sock_put(llcp_sock);
1141 }
1142
1143 if (sk->sk_state == LLCP_CONNECTED) {
1144 nfc_put_device(local->dev);
1145 sk->sk_state = LLCP_CLOSED;
1146 sk->sk_state_change(sk);
1147 }
1148
1149 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1150
1151 release_sock(sk);
1152 nfc_llcp_sock_put(llcp_sock);
1153 }
1154
1155 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1156 {
1157 struct nfc_llcp_sock *llcp_sock;
1158 struct sock *sk;
1159 u8 dsap, ssap;
1160
1161 dsap = nfc_llcp_dsap(skb);
1162 ssap = nfc_llcp_ssap(skb);
1163
1164 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1165 if (llcp_sock == NULL) {
1166 pr_err("Invalid CC\n");
1167 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1168
1169 return;
1170 }
1171
1172 sk = &llcp_sock->sk;
1173
1174 /* Unlink from connecting and link to the client array */
1175 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1176 nfc_llcp_sock_link(&local->sockets, sk);
1177 llcp_sock->dsap = ssap;
1178
1179 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1180 skb->len - LLCP_HEADER_SIZE);
1181
1182 sk->sk_state = LLCP_CONNECTED;
1183 sk->sk_state_change(sk);
1184
1185 nfc_llcp_sock_put(llcp_sock);
1186 }
1187
1188 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1189 {
1190 struct nfc_llcp_sock *llcp_sock;
1191 struct sock *sk;
1192 u8 dsap, ssap, reason;
1193
1194 dsap = nfc_llcp_dsap(skb);
1195 ssap = nfc_llcp_ssap(skb);
1196 reason = skb->data[2];
1197
1198 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1199
1200 switch (reason) {
1201 case LLCP_DM_NOBOUND:
1202 case LLCP_DM_REJ:
1203 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1204 break;
1205
1206 default:
1207 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1208 break;
1209 }
1210
1211 if (llcp_sock == NULL) {
1212 pr_debug("Already closed\n");
1213 return;
1214 }
1215
1216 sk = &llcp_sock->sk;
1217
1218 sk->sk_err = ENXIO;
1219 sk->sk_state = LLCP_CLOSED;
1220 sk->sk_state_change(sk);
1221
1222 nfc_llcp_sock_put(llcp_sock);
1223 }
1224
1225 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1226 struct sk_buff *skb)
1227 {
1228 struct nfc_llcp_sock *llcp_sock;
1229 u8 dsap, ssap, *tlv, type, length, tid, sap;
1230 u16 tlv_len, offset;
1231 char *service_name;
1232 size_t service_name_len;
1233 struct nfc_llcp_sdp_tlv *sdp;
1234 HLIST_HEAD(llc_sdres_list);
1235 size_t sdres_tlvs_len;
1236 HLIST_HEAD(nl_sdres_list);
1237
1238 dsap = nfc_llcp_dsap(skb);
1239 ssap = nfc_llcp_ssap(skb);
1240
1241 pr_debug("%d %d\n", dsap, ssap);
1242
1243 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1244 pr_err("Wrong SNL SAP\n");
1245 return;
1246 }
1247
1248 tlv = &skb->data[LLCP_HEADER_SIZE];
1249 tlv_len = skb->len - LLCP_HEADER_SIZE;
1250 offset = 0;
1251 sdres_tlvs_len = 0;
1252
1253 while (offset < tlv_len) {
1254 type = tlv[0];
1255 length = tlv[1];
1256
1257 switch (type) {
1258 case LLCP_TLV_SDREQ:
1259 tid = tlv[2];
1260 service_name = (char *) &tlv[3];
1261 service_name_len = length - 1;
1262
1263 pr_debug("Looking for %.16s\n", service_name);
1264
1265 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1266 !strncmp(service_name, "urn:nfc:sn:sdp",
1267 service_name_len)) {
1268 sap = 1;
1269 goto add_snl;
1270 }
1271
1272 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1273 service_name_len);
1274 if (!llcp_sock) {
1275 sap = 0;
1276 goto add_snl;
1277 }
1278
1279 /*
1280 * We found a socket but its ssap has not been reserved
1281 * yet. We need to assign it for good and send a reply.
1282 * The ssap will be freed when the socket is closed.
1283 */
1284 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1285 atomic_t *client_count;
1286
1287 sap = nfc_llcp_reserve_sdp_ssap(local);
1288
1289 pr_debug("Reserving %d\n", sap);
1290
1291 if (sap == LLCP_SAP_MAX) {
1292 sap = 0;
1293 goto add_snl;
1294 }
1295
1296 client_count =
1297 &local->local_sdp_cnt[sap -
1298 LLCP_WKS_NUM_SAP];
1299
1300 atomic_inc(client_count);
1301
1302 llcp_sock->ssap = sap;
1303 llcp_sock->reserved_ssap = sap;
1304 } else {
1305 sap = llcp_sock->ssap;
1306 }
1307
1308 pr_debug("%p %d\n", llcp_sock, sap);
1309
1310 add_snl:
1311 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1312 if (sdp == NULL)
1313 goto exit;
1314
1315 sdres_tlvs_len += sdp->tlv_len;
1316 hlist_add_head(&sdp->node, &llc_sdres_list);
1317 break;
1318
1319 case LLCP_TLV_SDRES:
1320 mutex_lock(&local->sdreq_lock);
1321
1322 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1323
1324 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1325 if (sdp->tid != tlv[2])
1326 continue;
1327
1328 sdp->sap = tlv[3];
1329
1330 pr_debug("Found: uri=%s, sap=%d\n",
1331 sdp->uri, sdp->sap);
1332
1333 hlist_del(&sdp->node);
1334
1335 hlist_add_head(&sdp->node, &nl_sdres_list);
1336
1337 break;
1338 }
1339
1340 mutex_unlock(&local->sdreq_lock);
1341 break;
1342
1343 default:
1344 pr_err("Invalid SNL tlv value 0x%x\n", type);
1345 break;
1346 }
1347
1348 offset += length + 2;
1349 tlv += length + 2;
1350 }
1351
1352 exit:
1353 if (!hlist_empty(&nl_sdres_list))
1354 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1355
1356 if (!hlist_empty(&llc_sdres_list))
1357 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1358 }
1359
1360 static void nfc_llcp_rx_work(struct work_struct *work)
1361 {
1362 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1363 rx_work);
1364 u8 dsap, ssap, ptype;
1365 struct sk_buff *skb;
1366
1367 skb = local->rx_pending;
1368 if (skb == NULL) {
1369 pr_debug("No pending SKB\n");
1370 return;
1371 }
1372
1373 ptype = nfc_llcp_ptype(skb);
1374 dsap = nfc_llcp_dsap(skb);
1375 ssap = nfc_llcp_ssap(skb);
1376
1377 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1378
1379 if (ptype != LLCP_PDU_SYMM)
1380 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1381 16, 1, skb->data, skb->len, true);
1382
1383 __net_timestamp(skb);
1384
1385 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1386
1387 switch (ptype) {
1388 case LLCP_PDU_SYMM:
1389 pr_debug("SYMM\n");
1390 break;
1391
1392 case LLCP_PDU_UI:
1393 pr_debug("UI\n");
1394 nfc_llcp_recv_ui(local, skb);
1395 break;
1396
1397 case LLCP_PDU_CONNECT:
1398 pr_debug("CONNECT\n");
1399 nfc_llcp_recv_connect(local, skb);
1400 break;
1401
1402 case LLCP_PDU_DISC:
1403 pr_debug("DISC\n");
1404 nfc_llcp_recv_disc(local, skb);
1405 break;
1406
1407 case LLCP_PDU_CC:
1408 pr_debug("CC\n");
1409 nfc_llcp_recv_cc(local, skb);
1410 break;
1411
1412 case LLCP_PDU_DM:
1413 pr_debug("DM\n");
1414 nfc_llcp_recv_dm(local, skb);
1415 break;
1416
1417 case LLCP_PDU_SNL:
1418 pr_debug("SNL\n");
1419 nfc_llcp_recv_snl(local, skb);
1420 break;
1421
1422 case LLCP_PDU_I:
1423 case LLCP_PDU_RR:
1424 case LLCP_PDU_RNR:
1425 pr_debug("I frame\n");
1426 nfc_llcp_recv_hdlc(local, skb);
1427 break;
1428
1429 }
1430
1431 schedule_work(&local->tx_work);
1432 kfree_skb(local->rx_pending);
1433 local->rx_pending = NULL;
1434 }
1435
1436 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1437 {
1438 local->rx_pending = skb;
1439 del_timer(&local->link_timer);
1440 schedule_work(&local->rx_work);
1441 }
1442
1443 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1444 {
1445 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1446
1447 pr_debug("Received an LLCP PDU\n");
1448 if (err < 0) {
1449 pr_err("err %d\n", err);
1450 return;
1451 }
1452
1453 __nfc_llcp_recv(local, skb);
1454 }
1455
1456 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1457 {
1458 struct nfc_llcp_local *local;
1459
1460 local = nfc_llcp_find_local(dev);
1461 if (local == NULL)
1462 return -ENODEV;
1463
1464 __nfc_llcp_recv(local, skb);
1465
1466 return 0;
1467 }
1468
1469 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1470 {
1471 struct nfc_llcp_local *local;
1472
1473 local = nfc_llcp_find_local(dev);
1474 if (local == NULL)
1475 return;
1476
1477 /* Close and purge all existing sockets */
1478 nfc_llcp_socket_release(local, true, 0);
1479 }
1480
1481 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1482 u8 comm_mode, u8 rf_mode)
1483 {
1484 struct nfc_llcp_local *local;
1485
1486 pr_debug("rf mode %d\n", rf_mode);
1487
1488 local = nfc_llcp_find_local(dev);
1489 if (local == NULL)
1490 return;
1491
1492 local->target_idx = target_idx;
1493 local->comm_mode = comm_mode;
1494 local->rf_mode = rf_mode;
1495
1496 if (rf_mode == NFC_RF_INITIATOR) {
1497 pr_debug("Queueing Tx work\n");
1498
1499 schedule_work(&local->tx_work);
1500 } else {
1501 mod_timer(&local->link_timer,
1502 jiffies + msecs_to_jiffies(local->remote_lto));
1503 }
1504 }
1505
1506 int nfc_llcp_register_device(struct nfc_dev *ndev)
1507 {
1508 struct nfc_llcp_local *local;
1509
1510 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1511 if (local == NULL)
1512 return -ENOMEM;
1513
1514 local->dev = ndev;
1515 INIT_LIST_HEAD(&local->list);
1516 kref_init(&local->ref);
1517 mutex_init(&local->sdp_lock);
1518 init_timer(&local->link_timer);
1519 local->link_timer.data = (unsigned long) local;
1520 local->link_timer.function = nfc_llcp_symm_timer;
1521
1522 skb_queue_head_init(&local->tx_queue);
1523 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1524
1525 local->rx_pending = NULL;
1526 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1527
1528 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1529
1530 rwlock_init(&local->sockets.lock);
1531 rwlock_init(&local->connecting_sockets.lock);
1532 rwlock_init(&local->raw_sockets.lock);
1533
1534 local->lto = 150; /* 1500 ms */
1535 local->rw = LLCP_MAX_RW;
1536 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1537
1538 nfc_llcp_build_gb(local);
1539
1540 local->remote_miu = LLCP_DEFAULT_MIU;
1541 local->remote_lto = LLCP_DEFAULT_LTO;
1542
1543 mutex_init(&local->sdreq_lock);
1544 INIT_HLIST_HEAD(&local->pending_sdreqs);
1545 init_timer(&local->sdreq_timer);
1546 local->sdreq_timer.data = (unsigned long) local;
1547 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1548 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1549
1550 list_add(&local->list, &llcp_devices);
1551
1552 return 0;
1553 }
1554
1555 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1556 {
1557 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1558
1559 if (local == NULL) {
1560 pr_debug("No such device\n");
1561 return;
1562 }
1563
1564 local_cleanup(local, false);
1565
1566 nfc_llcp_local_put(local);
1567 }
1568
1569 int __init nfc_llcp_init(void)
1570 {
1571 INIT_LIST_HEAD(&llcp_devices);
1572
1573 return nfc_llcp_sock_init();
1574 }
1575
1576 void nfc_llcp_exit(void)
1577 {
1578 nfc_llcp_sock_exit();
1579 }
Linux kernel - Deliverables
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