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x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / net / nfc / llcp_core.c
blob7e619ff8a6534625114588b5d7aee0dbc0cc2598
1 /*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
3 * Copyright (C) 2014 Marvell International Ltd.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
20
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/list.h>
24 #include <linux/nfc.h>
25
26 #include "nfc.h"
27 #include "llcp.h"
28
29 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
30
31 static LIST_HEAD(llcp_devices);
32
33 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
34
35 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
36 {
37 write_lock(&l->lock);
38 sk_add_node(sk, &l->head);
39 write_unlock(&l->lock);
40 }
41
42 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
43 {
44 write_lock(&l->lock);
45 sk_del_node_init(sk);
46 write_unlock(&l->lock);
47 }
48
49 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
50 {
51 sock->remote_rw = LLCP_DEFAULT_RW;
52 sock->remote_miu = LLCP_MAX_MIU + 1;
53 }
54
55 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
56 {
57 struct nfc_llcp_local *local = sock->local;
58 struct sk_buff *s, *tmp;
59
60 pr_debug("%p\n", &sock->sk);
61
62 skb_queue_purge(&sock->tx_queue);
63 skb_queue_purge(&sock->tx_pending_queue);
64
65 if (local == NULL)
66 return;
67
68 /* Search for local pending SKBs that are related to this socket */
69 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
70 if (s->sk != &sock->sk)
71 continue;
72
73 skb_unlink(s, &local->tx_queue);
74 kfree_skb(s);
75 }
76 }
77
78 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
79 int err)
80 {
81 struct sock *sk;
82 struct hlist_node *tmp;
83 struct nfc_llcp_sock *llcp_sock;
84
85 skb_queue_purge(&local->tx_queue);
86
87 write_lock(&local->sockets.lock);
88
89 sk_for_each_safe(sk, tmp, &local->sockets.head) {
90 llcp_sock = nfc_llcp_sock(sk);
91
92 bh_lock_sock(sk);
93
94 nfc_llcp_socket_purge(llcp_sock);
95
96 if (sk->sk_state == LLCP_CONNECTED)
97 nfc_put_device(llcp_sock->dev);
98
99 if (sk->sk_state == LLCP_LISTEN) {
100 struct nfc_llcp_sock *lsk, *n;
101 struct sock *accept_sk;
102
103 list_for_each_entry_safe(lsk, n,
104 &llcp_sock->accept_queue,
105 accept_queue) {
106 accept_sk = &lsk->sk;
107 bh_lock_sock(accept_sk);
108
109 nfc_llcp_accept_unlink(accept_sk);
110
111 if (err)
112 accept_sk->sk_err = err;
113 accept_sk->sk_state = LLCP_CLOSED;
114 accept_sk->sk_state_change(sk);
115
116 bh_unlock_sock(accept_sk);
117 }
118 }
119
120 if (err)
121 sk->sk_err = err;
122 sk->sk_state = LLCP_CLOSED;
123 sk->sk_state_change(sk);
124
125 bh_unlock_sock(sk);
126
127 sk_del_node_init(sk);
128 }
129
130 write_unlock(&local->sockets.lock);
131
132 /* If we still have a device, we keep the RAW sockets alive */
133 if (device == true)
134 return;
135
136 write_lock(&local->raw_sockets.lock);
137
138 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
139 llcp_sock = nfc_llcp_sock(sk);
140
141 bh_lock_sock(sk);
142
143 nfc_llcp_socket_purge(llcp_sock);
144
145 if (err)
146 sk->sk_err = err;
147 sk->sk_state = LLCP_CLOSED;
148 sk->sk_state_change(sk);
149
150 bh_unlock_sock(sk);
151
152 sk_del_node_init(sk);
153 }
154
155 write_unlock(&local->raw_sockets.lock);
156 }
157
158 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
159 {
160 kref_get(&local->ref);
161
162 return local;
163 }
164
165 static void local_cleanup(struct nfc_llcp_local *local)
166 {
167 nfc_llcp_socket_release(local, false, ENXIO);
168 del_timer_sync(&local->link_timer);
169 skb_queue_purge(&local->tx_queue);
170 cancel_work_sync(&local->tx_work);
171 cancel_work_sync(&local->rx_work);
172 cancel_work_sync(&local->timeout_work);
173 kfree_skb(local->rx_pending);
174 del_timer_sync(&local->sdreq_timer);
175 cancel_work_sync(&local->sdreq_timeout_work);
176 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
177 }
178
179 static void local_release(struct kref *ref)
180 {
181 struct nfc_llcp_local *local;
182
183 local = container_of(ref, struct nfc_llcp_local, ref);
184
185 list_del(&local->list);
186 local_cleanup(local);
187 kfree(local);
188 }
189
190 int nfc_llcp_local_put(struct nfc_llcp_local *local)
191 {
192 if (local == NULL)
193 return 0;
194
195 return kref_put(&local->ref, local_release);
196 }
197
198 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
199 u8 ssap, u8 dsap)
200 {
201 struct sock *sk;
202 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
203
204 pr_debug("ssap dsap %d %d\n", ssap, dsap);
205
206 if (ssap == 0 && dsap == 0)
207 return NULL;
208
209 read_lock(&local->sockets.lock);
210
211 llcp_sock = NULL;
212
213 sk_for_each(sk, &local->sockets.head) {
214 tmp_sock = nfc_llcp_sock(sk);
215
216 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
217 llcp_sock = tmp_sock;
218 break;
219 }
220 }
221
222 read_unlock(&local->sockets.lock);
223
224 if (llcp_sock == NULL)
225 return NULL;
226
227 sock_hold(&llcp_sock->sk);
228
229 return llcp_sock;
230 }
231
232 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
233 {
234 sock_put(&sock->sk);
235 }
236
237 static void nfc_llcp_timeout_work(struct work_struct *work)
238 {
239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
240 timeout_work);
241
242 nfc_dep_link_down(local->dev);
243 }
244
245 static void nfc_llcp_symm_timer(unsigned long data)
246 {
247 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
248
249 pr_err("SYMM timeout\n");
250
251 schedule_work(&local->timeout_work);
252 }
253
254 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
255 {
256 unsigned long time;
257 HLIST_HEAD(nl_sdres_list);
258 struct hlist_node *n;
259 struct nfc_llcp_sdp_tlv *sdp;
260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
261 sdreq_timeout_work);
262
263 mutex_lock(&local->sdreq_lock);
264
265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
266
267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
268 if (time_after(sdp->time, time))
269 continue;
270
271 sdp->sap = LLCP_SDP_UNBOUND;
272
273 hlist_del(&sdp->node);
274
275 hlist_add_head(&sdp->node, &nl_sdres_list);
276 }
277
278 if (!hlist_empty(&local->pending_sdreqs))
279 mod_timer(&local->sdreq_timer,
280 jiffies + msecs_to_jiffies(3 * local->remote_lto));
281
282 mutex_unlock(&local->sdreq_lock);
283
284 if (!hlist_empty(&nl_sdres_list))
285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
286 }
287
288 static void nfc_llcp_sdreq_timer(unsigned long data)
289 {
290 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
291
292 schedule_work(&local->sdreq_timeout_work);
293 }
294
295 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
296 {
297 struct nfc_llcp_local *local;
298
299 list_for_each_entry(local, &llcp_devices, list)
300 if (local->dev == dev)
301 return local;
302
303 pr_debug("No device found\n");
304
305 return NULL;
306 }
307
308 static char *wks[] = {
309 NULL,
310 NULL, /* SDP */
311 "urn:nfc:sn:ip",
312 "urn:nfc:sn:obex",
313 "urn:nfc:sn:snep",
314 };
315
316 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
317 {
318 int sap, num_wks;
319
320 pr_debug("%s\n", service_name);
321
322 if (service_name == NULL)
323 return -EINVAL;
324
325 num_wks = ARRAY_SIZE(wks);
326
327 for (sap = 0; sap < num_wks; sap++) {
328 if (wks[sap] == NULL)
329 continue;
330
331 if (strncmp(wks[sap], service_name, service_name_len) == 0)
332 return sap;
333 }
334
335 return -EINVAL;
336 }
337
338 static
339 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
340 u8 *sn, size_t sn_len)
341 {
342 struct sock *sk;
343 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
344
345 pr_debug("sn %zd %p\n", sn_len, sn);
346
347 if (sn == NULL || sn_len == 0)
348 return NULL;
349
350 read_lock(&local->sockets.lock);
351
352 llcp_sock = NULL;
353
354 sk_for_each(sk, &local->sockets.head) {
355 tmp_sock = nfc_llcp_sock(sk);
356
357 pr_debug("llcp sock %p\n", tmp_sock);
358
359 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
360 tmp_sock->sk.sk_state != LLCP_LISTEN)
361 continue;
362
363 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
364 tmp_sock->sk.sk_state != LLCP_BOUND)
365 continue;
366
367 if (tmp_sock->service_name == NULL ||
368 tmp_sock->service_name_len == 0)
369 continue;
370
371 if (tmp_sock->service_name_len != sn_len)
372 continue;
373
374 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
375 llcp_sock = tmp_sock;
376 break;
377 }
378 }
379
380 read_unlock(&local->sockets.lock);
381
382 pr_debug("Found llcp sock %p\n", llcp_sock);
383
384 return llcp_sock;
385 }
386
387 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
388 struct nfc_llcp_sock *sock)
389 {
390 mutex_lock(&local->sdp_lock);
391
392 if (sock->service_name != NULL && sock->service_name_len > 0) {
393 int ssap = nfc_llcp_wks_sap(sock->service_name,
394 sock->service_name_len);
395
396 if (ssap > 0) {
397 pr_debug("WKS %d\n", ssap);
398
399 /* This is a WKS, let's check if it's free */
400 if (local->local_wks & BIT(ssap)) {
401 mutex_unlock(&local->sdp_lock);
402
403 return LLCP_SAP_MAX;
404 }
405
406 set_bit(ssap, &local->local_wks);
407 mutex_unlock(&local->sdp_lock);
408
409 return ssap;
410 }
411
412 /*
413 * Check if there already is a non WKS socket bound
414 * to this service name.
415 */
416 if (nfc_llcp_sock_from_sn(local, sock->service_name,
417 sock->service_name_len) != NULL) {
418 mutex_unlock(&local->sdp_lock);
419
420 return LLCP_SAP_MAX;
421 }
422
423 mutex_unlock(&local->sdp_lock);
424
425 return LLCP_SDP_UNBOUND;
426
427 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
428 if (!test_bit(sock->ssap, &local->local_wks)) {
429 set_bit(sock->ssap, &local->local_wks);
430 mutex_unlock(&local->sdp_lock);
431
432 return sock->ssap;
433 }
434 }
435
436 mutex_unlock(&local->sdp_lock);
437
438 return LLCP_SAP_MAX;
439 }
440
441 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
442 {
443 u8 local_ssap;
444
445 mutex_lock(&local->sdp_lock);
446
447 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
448 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
449 mutex_unlock(&local->sdp_lock);
450 return LLCP_SAP_MAX;
451 }
452
453 set_bit(local_ssap, &local->local_sap);
454
455 mutex_unlock(&local->sdp_lock);
456
457 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
458 }
459
460 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
461 {
462 u8 local_ssap;
463 unsigned long *sdp;
464
465 if (ssap < LLCP_WKS_NUM_SAP) {
466 local_ssap = ssap;
467 sdp = &local->local_wks;
468 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
469 atomic_t *client_cnt;
470
471 local_ssap = ssap - LLCP_WKS_NUM_SAP;
472 sdp = &local->local_sdp;
473 client_cnt = &local->local_sdp_cnt[local_ssap];
474
475 pr_debug("%d clients\n", atomic_read(client_cnt));
476
477 mutex_lock(&local->sdp_lock);
478
479 if (atomic_dec_and_test(client_cnt)) {
480 struct nfc_llcp_sock *l_sock;
481
482 pr_debug("No more clients for SAP %d\n", ssap);
483
484 clear_bit(local_ssap, sdp);
485
486 /* Find the listening sock and set it back to UNBOUND */
487 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
488 if (l_sock) {
489 l_sock->ssap = LLCP_SDP_UNBOUND;
490 nfc_llcp_sock_put(l_sock);
491 }
492 }
493
494 mutex_unlock(&local->sdp_lock);
495
496 return;
497 } else if (ssap < LLCP_MAX_SAP) {
498 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
499 sdp = &local->local_sap;
500 } else {
501 return;
502 }
503
504 mutex_lock(&local->sdp_lock);
505
506 clear_bit(local_ssap, sdp);
507
508 mutex_unlock(&local->sdp_lock);
509 }
510
511 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
512 {
513 u8 ssap;
514
515 mutex_lock(&local->sdp_lock);
516
517 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
518 if (ssap == LLCP_SDP_NUM_SAP) {
519 mutex_unlock(&local->sdp_lock);
520
521 return LLCP_SAP_MAX;
522 }
523
524 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
525
526 set_bit(ssap, &local->local_sdp);
527
528 mutex_unlock(&local->sdp_lock);
529
530 return LLCP_WKS_NUM_SAP + ssap;
531 }
532
533 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
534 {
535 u8 *gb_cur, version, version_length;
536 u8 lto_length, wks_length, miux_length;
537 u8 *version_tlv = NULL, *lto_tlv = NULL,
538 *wks_tlv = NULL, *miux_tlv = NULL;
539 __be16 wks = cpu_to_be16(local->local_wks);
540 u8 gb_len = 0;
541 int ret = 0;
542
543 version = LLCP_VERSION_11;
544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
545 1, &version_length);
546 if (!version_tlv) {
547 ret = -ENOMEM;
548 goto out;
549 }
550 gb_len += version_length;
551
552 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
553 if (!lto_tlv) {
554 ret = -ENOMEM;
555 goto out;
556 }
557 gb_len += lto_length;
558
559 pr_debug("Local wks 0x%lx\n", local->local_wks);
560 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
561 if (!wks_tlv) {
562 ret = -ENOMEM;
563 goto out;
564 }
565 gb_len += wks_length;
566
567 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
568 &miux_length);
569 if (!miux_tlv) {
570 ret = -ENOMEM;
571 goto out;
572 }
573 gb_len += miux_length;
574
575 gb_len += ARRAY_SIZE(llcp_magic);
576
577 if (gb_len > NFC_MAX_GT_LEN) {
578 ret = -EINVAL;
579 goto out;
580 }
581
582 gb_cur = local->gb;
583
584 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
585 gb_cur += ARRAY_SIZE(llcp_magic);
586
587 memcpy(gb_cur, version_tlv, version_length);
588 gb_cur += version_length;
589
590 memcpy(gb_cur, lto_tlv, lto_length);
591 gb_cur += lto_length;
592
593 memcpy(gb_cur, wks_tlv, wks_length);
594 gb_cur += wks_length;
595
596 memcpy(gb_cur, miux_tlv, miux_length);
597 gb_cur += miux_length;
598
599 local->gb_len = gb_len;
600
601 out:
602 kfree(version_tlv);
603 kfree(lto_tlv);
604 kfree(wks_tlv);
605 kfree(miux_tlv);
606
607 return ret;
608 }
609
610 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
611 {
612 struct nfc_llcp_local *local;
613
614 local = nfc_llcp_find_local(dev);
615 if (local == NULL) {
616 *general_bytes_len = 0;
617 return NULL;
618 }
619
620 nfc_llcp_build_gb(local);
621
622 *general_bytes_len = local->gb_len;
623
624 return local->gb;
625 }
626
627 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
628 {
629 struct nfc_llcp_local *local;
630
631 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
632 return -EINVAL;
633
634 local = nfc_llcp_find_local(dev);
635 if (local == NULL) {
636 pr_err("No LLCP device\n");
637 return -ENODEV;
638 }
639
640 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
641 memcpy(local->remote_gb, gb, gb_len);
642 local->remote_gb_len = gb_len;
643
644 if (memcmp(local->remote_gb, llcp_magic, 3)) {
645 pr_err("MAC does not support LLCP\n");
646 return -EINVAL;
647 }
648
649 return nfc_llcp_parse_gb_tlv(local,
650 &local->remote_gb[3],
651 local->remote_gb_len - 3);
652 }
653
654 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
655 {
656 return (pdu->data[0] & 0xfc) >> 2;
657 }
658
659 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
660 {
661 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
662 }
663
664 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
665 {
666 return pdu->data[1] & 0x3f;
667 }
668
669 static u8 nfc_llcp_ns(struct sk_buff *pdu)
670 {
671 return pdu->data[2] >> 4;
672 }
673
674 static u8 nfc_llcp_nr(struct sk_buff *pdu)
675 {
676 return pdu->data[2] & 0xf;
677 }
678
679 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
680 {
681 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
682 sock->send_n = (sock->send_n + 1) % 16;
683 sock->recv_ack_n = (sock->recv_n - 1) % 16;
684 }
685
686 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
687 struct sk_buff *skb, u8 direction)
688 {
689 struct sk_buff *skb_copy = NULL, *nskb;
690 struct sock *sk;
691 u8 *data;
692
693 read_lock(&local->raw_sockets.lock);
694
695 sk_for_each(sk, &local->raw_sockets.head) {
696 if (sk->sk_state != LLCP_BOUND)
697 continue;
698
699 if (skb_copy == NULL) {
700 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
701 GFP_ATOMIC, true);
702
703 if (skb_copy == NULL)
704 continue;
705
706 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
707
708 data[0] = local->dev ? local->dev->idx : 0xFF;
709 data[1] = direction & 0x01;
710 data[1] |= (RAW_PAYLOAD_LLCP << 1);
711 }
712
713 nskb = skb_clone(skb_copy, GFP_ATOMIC);
714 if (!nskb)
715 continue;
716
717 if (sock_queue_rcv_skb(sk, nskb))
718 kfree_skb(nskb);
719 }
720
721 read_unlock(&local->raw_sockets.lock);
722
723 kfree_skb(skb_copy);
724 }
725
726 static void nfc_llcp_tx_work(struct work_struct *work)
727 {
728 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
729 tx_work);
730 struct sk_buff *skb;
731 struct sock *sk;
732 struct nfc_llcp_sock *llcp_sock;
733
734 skb = skb_dequeue(&local->tx_queue);
735 if (skb != NULL) {
736 sk = skb->sk;
737 llcp_sock = nfc_llcp_sock(sk);
738
739 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
740 kfree_skb(skb);
741 nfc_llcp_send_symm(local->dev);
742 } else if (llcp_sock && !llcp_sock->remote_ready) {
743 skb_queue_head(&local->tx_queue, skb);
744 nfc_llcp_send_symm(local->dev);
745 } else {
746 struct sk_buff *copy_skb = NULL;
747 u8 ptype = nfc_llcp_ptype(skb);
748 int ret;
749
750 pr_debug("Sending pending skb\n");
751 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
752 16, 1, skb->data, skb->len, true);
753
754 if (ptype == LLCP_PDU_DISC && sk != NULL &&
755 sk->sk_state == LLCP_DISCONNECTING) {
756 nfc_llcp_sock_unlink(&local->sockets, sk);
757 sock_orphan(sk);
758 sock_put(sk);
759 }
760
761 if (ptype == LLCP_PDU_I)
762 copy_skb = skb_copy(skb, GFP_ATOMIC);
763
764 __net_timestamp(skb);
765
766 nfc_llcp_send_to_raw_sock(local, skb,
767 NFC_DIRECTION_TX);
768
769 ret = nfc_data_exchange(local->dev, local->target_idx,
770 skb, nfc_llcp_recv, local);
771
772 if (ret) {
773 kfree_skb(copy_skb);
774 goto out;
775 }
776
777 if (ptype == LLCP_PDU_I && copy_skb)
778 skb_queue_tail(&llcp_sock->tx_pending_queue,
779 copy_skb);
780 }
781 } else {
782 nfc_llcp_send_symm(local->dev);
783 }
784
785 out:
786 mod_timer(&local->link_timer,
787 jiffies + msecs_to_jiffies(2 * local->remote_lto));
788 }
789
790 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
791 u8 ssap)
792 {
793 struct sock *sk;
794 struct nfc_llcp_sock *llcp_sock;
795
796 read_lock(&local->connecting_sockets.lock);
797
798 sk_for_each(sk, &local->connecting_sockets.head) {
799 llcp_sock = nfc_llcp_sock(sk);
800
801 if (llcp_sock->ssap == ssap) {
802 sock_hold(&llcp_sock->sk);
803 goto out;
804 }
805 }
806
807 llcp_sock = NULL;
808
809 out:
810 read_unlock(&local->connecting_sockets.lock);
811
812 return llcp_sock;
813 }
814
815 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
816 u8 *sn, size_t sn_len)
817 {
818 struct nfc_llcp_sock *llcp_sock;
819
820 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
821
822 if (llcp_sock == NULL)
823 return NULL;
824
825 sock_hold(&llcp_sock->sk);
826
827 return llcp_sock;
828 }
829
830 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
831 {
832 u8 *tlv = &skb->data[2], type, length;
833 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
834
835 while (offset < tlv_array_len) {
836 type = tlv[0];
837 length = tlv[1];
838
839 pr_debug("type 0x%x length %d\n", type, length);
840
841 if (type == LLCP_TLV_SN) {
842 *sn_len = length;
843 return &tlv[2];
844 }
845
846 offset += length + 2;
847 tlv += length + 2;
848 }
849
850 return NULL;
851 }
852
853 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
854 struct sk_buff *skb)
855 {
856 struct nfc_llcp_sock *llcp_sock;
857 struct nfc_llcp_ui_cb *ui_cb;
858 u8 dsap, ssap;
859
860 dsap = nfc_llcp_dsap(skb);
861 ssap = nfc_llcp_ssap(skb);
862
863 ui_cb = nfc_llcp_ui_skb_cb(skb);
864 ui_cb->dsap = dsap;
865 ui_cb->ssap = ssap;
866
867 pr_debug("%d %d\n", dsap, ssap);
868
869 /* We're looking for a bound socket, not a client one */
870 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
871 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
872 return;
873
874 /* There is no sequence with UI frames */
875 skb_pull(skb, LLCP_HEADER_SIZE);
876 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
877 /*
878 * UI frames will be freed from the socket layer, so we
879 * need to keep them alive until someone receives them.
880 */
881 skb_get(skb);
882 } else {
883 pr_err("Receive queue is full\n");
884 }
885
886 nfc_llcp_sock_put(llcp_sock);
887 }
888
889 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
890 struct sk_buff *skb)
891 {
892 struct sock *new_sk, *parent;
893 struct nfc_llcp_sock *sock, *new_sock;
894 u8 dsap, ssap, reason;
895
896 dsap = nfc_llcp_dsap(skb);
897 ssap = nfc_llcp_ssap(skb);
898
899 pr_debug("%d %d\n", dsap, ssap);
900
901 if (dsap != LLCP_SAP_SDP) {
902 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
903 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
904 reason = LLCP_DM_NOBOUND;
905 goto fail;
906 }
907 } else {
908 u8 *sn;
909 size_t sn_len;
910
911 sn = nfc_llcp_connect_sn(skb, &sn_len);
912 if (sn == NULL) {
913 reason = LLCP_DM_NOBOUND;
914 goto fail;
915 }
916
917 pr_debug("Service name length %zu\n", sn_len);
918
919 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
920 if (sock == NULL) {
921 reason = LLCP_DM_NOBOUND;
922 goto fail;
923 }
924 }
925
926 lock_sock(&sock->sk);
927
928 parent = &sock->sk;
929
930 if (sk_acceptq_is_full(parent)) {
931 reason = LLCP_DM_REJ;
932 release_sock(&sock->sk);
933 sock_put(&sock->sk);
934 goto fail;
935 }
936
937 if (sock->ssap == LLCP_SDP_UNBOUND) {
938 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
939
940 pr_debug("First client, reserving %d\n", ssap);
941
942 if (ssap == LLCP_SAP_MAX) {
943 reason = LLCP_DM_REJ;
944 release_sock(&sock->sk);
945 sock_put(&sock->sk);
946 goto fail;
947 }
948
949 sock->ssap = ssap;
950 }
951
952 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
953 if (new_sk == NULL) {
954 reason = LLCP_DM_REJ;
955 release_sock(&sock->sk);
956 sock_put(&sock->sk);
957 goto fail;
958 }
959
960 new_sock = nfc_llcp_sock(new_sk);
961 new_sock->dev = local->dev;
962 new_sock->local = nfc_llcp_local_get(local);
963 new_sock->rw = sock->rw;
964 new_sock->miux = sock->miux;
965 new_sock->nfc_protocol = sock->nfc_protocol;
966 new_sock->dsap = ssap;
967 new_sock->target_idx = local->target_idx;
968 new_sock->parent = parent;
969 new_sock->ssap = sock->ssap;
970 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
971 atomic_t *client_count;
972
973 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
974
975 client_count =
976 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
977
978 atomic_inc(client_count);
979 new_sock->reserved_ssap = sock->ssap;
980 }
981
982 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
983 skb->len - LLCP_HEADER_SIZE);
984
985 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
986
987 nfc_llcp_sock_link(&local->sockets, new_sk);
988
989 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
990
991 nfc_get_device(local->dev->idx);
992
993 new_sk->sk_state = LLCP_CONNECTED;
994
995 /* Wake the listening processes */
996 parent->sk_data_ready(parent);
997
998 /* Send CC */
999 nfc_llcp_send_cc(new_sock);
1000
1001 release_sock(&sock->sk);
1002 sock_put(&sock->sk);
1003
1004 return;
1005
1006 fail:
1007 /* Send DM */
1008 nfc_llcp_send_dm(local, dsap, ssap, reason);
1009 }
1010
1011 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1012 {
1013 int nr_frames = 0;
1014 struct nfc_llcp_local *local = sock->local;
1015
1016 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1017 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1018 sock->remote_rw);
1019
1020 /* Try to queue some I frames for transmission */
1021 while (sock->remote_ready &&
1022 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1023 struct sk_buff *pdu;
1024
1025 pdu = skb_dequeue(&sock->tx_queue);
1026 if (pdu == NULL)
1027 break;
1028
1029 /* Update N(S)/N(R) */
1030 nfc_llcp_set_nrns(sock, pdu);
1031
1032 skb_queue_tail(&local->tx_queue, pdu);
1033 nr_frames++;
1034 }
1035
1036 return nr_frames;
1037 }
1038
1039 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1040 struct sk_buff *skb)
1041 {
1042 struct nfc_llcp_sock *llcp_sock;
1043 struct sock *sk;
1044 u8 dsap, ssap, ptype, ns, nr;
1045
1046 ptype = nfc_llcp_ptype(skb);
1047 dsap = nfc_llcp_dsap(skb);
1048 ssap = nfc_llcp_ssap(skb);
1049 ns = nfc_llcp_ns(skb);
1050 nr = nfc_llcp_nr(skb);
1051
1052 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1053
1054 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1055 if (llcp_sock == NULL) {
1056 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1057 return;
1058 }
1059
1060 sk = &llcp_sock->sk;
1061 lock_sock(sk);
1062 if (sk->sk_state == LLCP_CLOSED) {
1063 release_sock(sk);
1064 nfc_llcp_sock_put(llcp_sock);
1065 }
1066
1067 /* Pass the payload upstream */
1068 if (ptype == LLCP_PDU_I) {
1069 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1070
1071 if (ns == llcp_sock->recv_n)
1072 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1073 else
1074 pr_err("Received out of sequence I PDU\n");
1075
1076 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1077 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1078 /*
1079 * I frames will be freed from the socket layer, so we
1080 * need to keep them alive until someone receives them.
1081 */
1082 skb_get(skb);
1083 } else {
1084 pr_err("Receive queue is full\n");
1085 }
1086 }
1087
1088 /* Remove skbs from the pending queue */
1089 if (llcp_sock->send_ack_n != nr) {
1090 struct sk_buff *s, *tmp;
1091 u8 n;
1092
1093 llcp_sock->send_ack_n = nr;
1094
1095 /* Remove and free all skbs until ns == nr */
1096 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1097 n = nfc_llcp_ns(s);
1098
1099 skb_unlink(s, &llcp_sock->tx_pending_queue);
1100 kfree_skb(s);
1101
1102 if (n == nr)
1103 break;
1104 }
1105
1106 /* Re-queue the remaining skbs for transmission */
1107 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1108 s, tmp) {
1109 skb_unlink(s, &llcp_sock->tx_pending_queue);
1110 skb_queue_head(&local->tx_queue, s);
1111 }
1112 }
1113
1114 if (ptype == LLCP_PDU_RR)
1115 llcp_sock->remote_ready = true;
1116 else if (ptype == LLCP_PDU_RNR)
1117 llcp_sock->remote_ready = false;
1118
1119 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1120 nfc_llcp_send_rr(llcp_sock);
1121
1122 release_sock(sk);
1123 nfc_llcp_sock_put(llcp_sock);
1124 }
1125
1126 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1127 struct sk_buff *skb)
1128 {
1129 struct nfc_llcp_sock *llcp_sock;
1130 struct sock *sk;
1131 u8 dsap, ssap;
1132
1133 dsap = nfc_llcp_dsap(skb);
1134 ssap = nfc_llcp_ssap(skb);
1135
1136 if ((dsap == 0) && (ssap == 0)) {
1137 pr_debug("Connection termination");
1138 nfc_dep_link_down(local->dev);
1139 return;
1140 }
1141
1142 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1143 if (llcp_sock == NULL) {
1144 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1145 return;
1146 }
1147
1148 sk = &llcp_sock->sk;
1149 lock_sock(sk);
1150
1151 nfc_llcp_socket_purge(llcp_sock);
1152
1153 if (sk->sk_state == LLCP_CLOSED) {
1154 release_sock(sk);
1155 nfc_llcp_sock_put(llcp_sock);
1156 }
1157
1158 if (sk->sk_state == LLCP_CONNECTED) {
1159 nfc_put_device(local->dev);
1160 sk->sk_state = LLCP_CLOSED;
1161 sk->sk_state_change(sk);
1162 }
1163
1164 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1165
1166 release_sock(sk);
1167 nfc_llcp_sock_put(llcp_sock);
1168 }
1169
1170 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1171 {
1172 struct nfc_llcp_sock *llcp_sock;
1173 struct sock *sk;
1174 u8 dsap, ssap;
1175
1176 dsap = nfc_llcp_dsap(skb);
1177 ssap = nfc_llcp_ssap(skb);
1178
1179 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1180 if (llcp_sock == NULL) {
1181 pr_err("Invalid CC\n");
1182 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1183
1184 return;
1185 }
1186
1187 sk = &llcp_sock->sk;
1188
1189 /* Unlink from connecting and link to the client array */
1190 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1191 nfc_llcp_sock_link(&local->sockets, sk);
1192 llcp_sock->dsap = ssap;
1193
1194 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1195 skb->len - LLCP_HEADER_SIZE);
1196
1197 sk->sk_state = LLCP_CONNECTED;
1198 sk->sk_state_change(sk);
1199
1200 nfc_llcp_sock_put(llcp_sock);
1201 }
1202
1203 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1204 {
1205 struct nfc_llcp_sock *llcp_sock;
1206 struct sock *sk;
1207 u8 dsap, ssap, reason;
1208
1209 dsap = nfc_llcp_dsap(skb);
1210 ssap = nfc_llcp_ssap(skb);
1211 reason = skb->data[2];
1212
1213 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1214
1215 switch (reason) {
1216 case LLCP_DM_NOBOUND:
1217 case LLCP_DM_REJ:
1218 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1219 break;
1220
1221 default:
1222 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1223 break;
1224 }
1225
1226 if (llcp_sock == NULL) {
1227 pr_debug("Already closed\n");
1228 return;
1229 }
1230
1231 sk = &llcp_sock->sk;
1232
1233 sk->sk_err = ENXIO;
1234 sk->sk_state = LLCP_CLOSED;
1235 sk->sk_state_change(sk);
1236
1237 nfc_llcp_sock_put(llcp_sock);
1238 }
1239
1240 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1241 struct sk_buff *skb)
1242 {
1243 struct nfc_llcp_sock *llcp_sock;
1244 u8 dsap, ssap, *tlv, type, length, tid, sap;
1245 u16 tlv_len, offset;
1246 char *service_name;
1247 size_t service_name_len;
1248 struct nfc_llcp_sdp_tlv *sdp;
1249 HLIST_HEAD(llc_sdres_list);
1250 size_t sdres_tlvs_len;
1251 HLIST_HEAD(nl_sdres_list);
1252
1253 dsap = nfc_llcp_dsap(skb);
1254 ssap = nfc_llcp_ssap(skb);
1255
1256 pr_debug("%d %d\n", dsap, ssap);
1257
1258 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1259 pr_err("Wrong SNL SAP\n");
1260 return;
1261 }
1262
1263 tlv = &skb->data[LLCP_HEADER_SIZE];
1264 tlv_len = skb->len - LLCP_HEADER_SIZE;
1265 offset = 0;
1266 sdres_tlvs_len = 0;
1267
1268 while (offset < tlv_len) {
1269 type = tlv[0];
1270 length = tlv[1];
1271
1272 switch (type) {
1273 case LLCP_TLV_SDREQ:
1274 tid = tlv[2];
1275 service_name = (char *) &tlv[3];
1276 service_name_len = length - 1;
1277
1278 pr_debug("Looking for %.16s\n", service_name);
1279
1280 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1281 !strncmp(service_name, "urn:nfc:sn:sdp",
1282 service_name_len)) {
1283 sap = 1;
1284 goto add_snl;
1285 }
1286
1287 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1288 service_name_len);
1289 if (!llcp_sock) {
1290 sap = 0;
1291 goto add_snl;
1292 }
1293
1294 /*
1295 * We found a socket but its ssap has not been reserved
1296 * yet. We need to assign it for good and send a reply.
1297 * The ssap will be freed when the socket is closed.
1298 */
1299 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1300 atomic_t *client_count;
1301
1302 sap = nfc_llcp_reserve_sdp_ssap(local);
1303
1304 pr_debug("Reserving %d\n", sap);
1305
1306 if (sap == LLCP_SAP_MAX) {
1307 sap = 0;
1308 goto add_snl;
1309 }
1310
1311 client_count =
1312 &local->local_sdp_cnt[sap -
1313 LLCP_WKS_NUM_SAP];
1314
1315 atomic_inc(client_count);
1316
1317 llcp_sock->ssap = sap;
1318 llcp_sock->reserved_ssap = sap;
1319 } else {
1320 sap = llcp_sock->ssap;
1321 }
1322
1323 pr_debug("%p %d\n", llcp_sock, sap);
1324
1325 add_snl:
1326 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1327 if (sdp == NULL)
1328 goto exit;
1329
1330 sdres_tlvs_len += sdp->tlv_len;
1331 hlist_add_head(&sdp->node, &llc_sdres_list);
1332 break;
1333
1334 case LLCP_TLV_SDRES:
1335 mutex_lock(&local->sdreq_lock);
1336
1337 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1338
1339 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1340 if (sdp->tid != tlv[2])
1341 continue;
1342
1343 sdp->sap = tlv[3];
1344
1345 pr_debug("Found: uri=%s, sap=%d\n",
1346 sdp->uri, sdp->sap);
1347
1348 hlist_del(&sdp->node);
1349
1350 hlist_add_head(&sdp->node, &nl_sdres_list);
1351
1352 break;
1353 }
1354
1355 mutex_unlock(&local->sdreq_lock);
1356 break;
1357
1358 default:
1359 pr_err("Invalid SNL tlv value 0x%x\n", type);
1360 break;
1361 }
1362
1363 offset += length + 2;
1364 tlv += length + 2;
1365 }
1366
1367 exit:
1368 if (!hlist_empty(&nl_sdres_list))
1369 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1370
1371 if (!hlist_empty(&llc_sdres_list))
1372 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1373 }
1374
1375 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1376 {
1377 u8 ptype;
1378 u16 pdu_len;
1379 struct sk_buff *new_skb;
1380
1381 if (skb->len <= LLCP_HEADER_SIZE) {
1382 pr_err("Malformed AGF PDU\n");
1383 return;
1384 }
1385
1386 skb_pull(skb, LLCP_HEADER_SIZE);
1387
1388 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1389 pdu_len = skb->data[0] << 8 | skb->data[1];
1390
1391 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1392
1393 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1394 pr_err("Malformed AGF PDU\n");
1395 return;
1396 }
1397
1398 ptype = nfc_llcp_ptype(skb);
1399
1400 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1401 goto next;
1402
1403 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1404 if (new_skb == NULL) {
1405 pr_err("Could not allocate PDU\n");
1406 return;
1407 }
1408
1409 skb_put_data(new_skb, skb->data, pdu_len);
1410
1411 nfc_llcp_rx_skb(local, new_skb);
1412
1413 kfree_skb(new_skb);
1414 next:
1415 skb_pull(skb, pdu_len);
1416 }
1417 }
1418
1419 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1420 {
1421 u8 dsap, ssap, ptype;
1422
1423 ptype = nfc_llcp_ptype(skb);
1424 dsap = nfc_llcp_dsap(skb);
1425 ssap = nfc_llcp_ssap(skb);
1426
1427 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1428
1429 if (ptype != LLCP_PDU_SYMM)
1430 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1431 skb->data, skb->len, true);
1432
1433 switch (ptype) {
1434 case LLCP_PDU_SYMM:
1435 pr_debug("SYMM\n");
1436 break;
1437
1438 case LLCP_PDU_UI:
1439 pr_debug("UI\n");
1440 nfc_llcp_recv_ui(local, skb);
1441 break;
1442
1443 case LLCP_PDU_CONNECT:
1444 pr_debug("CONNECT\n");
1445 nfc_llcp_recv_connect(local, skb);
1446 break;
1447
1448 case LLCP_PDU_DISC:
1449 pr_debug("DISC\n");
1450 nfc_llcp_recv_disc(local, skb);
1451 break;
1452
1453 case LLCP_PDU_CC:
1454 pr_debug("CC\n");
1455 nfc_llcp_recv_cc(local, skb);
1456 break;
1457
1458 case LLCP_PDU_DM:
1459 pr_debug("DM\n");
1460 nfc_llcp_recv_dm(local, skb);
1461 break;
1462
1463 case LLCP_PDU_SNL:
1464 pr_debug("SNL\n");
1465 nfc_llcp_recv_snl(local, skb);
1466 break;
1467
1468 case LLCP_PDU_I:
1469 case LLCP_PDU_RR:
1470 case LLCP_PDU_RNR:
1471 pr_debug("I frame\n");
1472 nfc_llcp_recv_hdlc(local, skb);
1473 break;
1474
1475 case LLCP_PDU_AGF:
1476 pr_debug("AGF frame\n");
1477 nfc_llcp_recv_agf(local, skb);
1478 break;
1479 }
1480 }
1481
1482 static void nfc_llcp_rx_work(struct work_struct *work)
1483 {
1484 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1485 rx_work);
1486 struct sk_buff *skb;
1487
1488 skb = local->rx_pending;
1489 if (skb == NULL) {
1490 pr_debug("No pending SKB\n");
1491 return;
1492 }
1493
1494 __net_timestamp(skb);
1495
1496 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1497
1498 nfc_llcp_rx_skb(local, skb);
1499
1500 schedule_work(&local->tx_work);
1501 kfree_skb(local->rx_pending);
1502 local->rx_pending = NULL;
1503 }
1504
1505 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1506 {
1507 local->rx_pending = skb;
1508 del_timer(&local->link_timer);
1509 schedule_work(&local->rx_work);
1510 }
1511
1512 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1513 {
1514 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1515
1516 pr_debug("Received an LLCP PDU\n");
1517 if (err < 0) {
1518 pr_err("err %d\n", err);
1519 return;
1520 }
1521
1522 __nfc_llcp_recv(local, skb);
1523 }
1524
1525 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1526 {
1527 struct nfc_llcp_local *local;
1528
1529 local = nfc_llcp_find_local(dev);
1530 if (local == NULL) {
1531 kfree_skb(skb);
1532 return -ENODEV;
1533 }
1534
1535 __nfc_llcp_recv(local, skb);
1536
1537 return 0;
1538 }
1539
1540 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1541 {
1542 struct nfc_llcp_local *local;
1543
1544 local = nfc_llcp_find_local(dev);
1545 if (local == NULL)
1546 return;
1547
1548 local->remote_miu = LLCP_DEFAULT_MIU;
1549 local->remote_lto = LLCP_DEFAULT_LTO;
1550
1551 /* Close and purge all existing sockets */
1552 nfc_llcp_socket_release(local, true, 0);
1553 }
1554
1555 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1556 u8 comm_mode, u8 rf_mode)
1557 {
1558 struct nfc_llcp_local *local;
1559
1560 pr_debug("rf mode %d\n", rf_mode);
1561
1562 local = nfc_llcp_find_local(dev);
1563 if (local == NULL)
1564 return;
1565
1566 local->target_idx = target_idx;
1567 local->comm_mode = comm_mode;
1568 local->rf_mode = rf_mode;
1569
1570 if (rf_mode == NFC_RF_INITIATOR) {
1571 pr_debug("Queueing Tx work\n");
1572
1573 schedule_work(&local->tx_work);
1574 } else {
1575 mod_timer(&local->link_timer,
1576 jiffies + msecs_to_jiffies(local->remote_lto));
1577 }
1578 }
1579
1580 int nfc_llcp_register_device(struct nfc_dev *ndev)
1581 {
1582 struct nfc_llcp_local *local;
1583
1584 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1585 if (local == NULL)
1586 return -ENOMEM;
1587
1588 local->dev = ndev;
1589 INIT_LIST_HEAD(&local->list);
1590 kref_init(&local->ref);
1591 mutex_init(&local->sdp_lock);
1592 init_timer(&local->link_timer);
1593 local->link_timer.data = (unsigned long) local;
1594 local->link_timer.function = nfc_llcp_symm_timer;
1595
1596 skb_queue_head_init(&local->tx_queue);
1597 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1598
1599 local->rx_pending = NULL;
1600 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1601
1602 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1603
1604 rwlock_init(&local->sockets.lock);
1605 rwlock_init(&local->connecting_sockets.lock);
1606 rwlock_init(&local->raw_sockets.lock);
1607
1608 local->lto = 150; /* 1500 ms */
1609 local->rw = LLCP_MAX_RW;
1610 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1611 local->local_wks = 0x1; /* LLC Link Management */
1612
1613 nfc_llcp_build_gb(local);
1614
1615 local->remote_miu = LLCP_DEFAULT_MIU;
1616 local->remote_lto = LLCP_DEFAULT_LTO;
1617
1618 mutex_init(&local->sdreq_lock);
1619 INIT_HLIST_HEAD(&local->pending_sdreqs);
1620 init_timer(&local->sdreq_timer);
1621 local->sdreq_timer.data = (unsigned long) local;
1622 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1623 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1624
1625 list_add(&local->list, &llcp_devices);
1626
1627 return 0;
1628 }
1629
1630 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1631 {
1632 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1633
1634 if (local == NULL) {
1635 pr_debug("No such device\n");
1636 return;
1637 }
1638
1639 local_cleanup(local);
1640
1641 nfc_llcp_local_put(local);
1642 }
1643
1644 int __init nfc_llcp_init(void)
1645 {
1646 return nfc_llcp_sock_init();
1647 }
1648
1649 void nfc_llcp_exit(void)
1650 {
1651 nfc_llcp_sock_exit();
1652 }
Linux with added FPC-III support