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Merge branch 'upstream' of git://git.infradead.org/users/pcmoore/audit
[mirror_ubuntu-artful-kernel.git] / net / nfc / llcp_core.c
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_tlv, version, version_length;
536 u8 *lto_tlv, lto_length;
537 u8 *wks_tlv, wks_length;
538 u8 *miux_tlv, miux_length;
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 gb_len += version_length;
547
548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
549 gb_len += lto_length;
550
551 pr_debug("Local wks 0x%lx\n", local->local_wks);
552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
553 gb_len += wks_length;
554
555 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
556 &miux_length);
557 gb_len += miux_length;
558
559 gb_len += ARRAY_SIZE(llcp_magic);
560
561 if (gb_len > NFC_MAX_GT_LEN) {
562 ret = -EINVAL;
563 goto out;
564 }
565
566 gb_cur = local->gb;
567
568 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
569 gb_cur += ARRAY_SIZE(llcp_magic);
570
571 memcpy(gb_cur, version_tlv, version_length);
572 gb_cur += version_length;
573
574 memcpy(gb_cur, lto_tlv, lto_length);
575 gb_cur += lto_length;
576
577 memcpy(gb_cur, wks_tlv, wks_length);
578 gb_cur += wks_length;
579
580 memcpy(gb_cur, miux_tlv, miux_length);
581 gb_cur += miux_length;
582
583 local->gb_len = gb_len;
584
585 out:
586 kfree(version_tlv);
587 kfree(lto_tlv);
588 kfree(wks_tlv);
589 kfree(miux_tlv);
590
591 return ret;
592 }
593
594 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
595 {
596 struct nfc_llcp_local *local;
597
598 local = nfc_llcp_find_local(dev);
599 if (local == NULL) {
600 *general_bytes_len = 0;
601 return NULL;
602 }
603
604 nfc_llcp_build_gb(local);
605
606 *general_bytes_len = local->gb_len;
607
608 return local->gb;
609 }
610
611 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
612 {
613 struct nfc_llcp_local *local;
614
615 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
616 return -EINVAL;
617
618 local = nfc_llcp_find_local(dev);
619 if (local == NULL) {
620 pr_err("No LLCP device\n");
621 return -ENODEV;
622 }
623
624 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
625 memcpy(local->remote_gb, gb, gb_len);
626 local->remote_gb_len = gb_len;
627
628 if (memcmp(local->remote_gb, llcp_magic, 3)) {
629 pr_err("MAC does not support LLCP\n");
630 return -EINVAL;
631 }
632
633 return nfc_llcp_parse_gb_tlv(local,
634 &local->remote_gb[3],
635 local->remote_gb_len - 3);
636 }
637
638 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
639 {
640 return (pdu->data[0] & 0xfc) >> 2;
641 }
642
643 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
644 {
645 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
646 }
647
648 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
649 {
650 return pdu->data[1] & 0x3f;
651 }
652
653 static u8 nfc_llcp_ns(struct sk_buff *pdu)
654 {
655 return pdu->data[2] >> 4;
656 }
657
658 static u8 nfc_llcp_nr(struct sk_buff *pdu)
659 {
660 return pdu->data[2] & 0xf;
661 }
662
663 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
664 {
665 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
666 sock->send_n = (sock->send_n + 1) % 16;
667 sock->recv_ack_n = (sock->recv_n - 1) % 16;
668 }
669
670 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
671 struct sk_buff *skb, u8 direction)
672 {
673 struct sk_buff *skb_copy = NULL, *nskb;
674 struct sock *sk;
675 u8 *data;
676
677 read_lock(&local->raw_sockets.lock);
678
679 sk_for_each(sk, &local->raw_sockets.head) {
680 if (sk->sk_state != LLCP_BOUND)
681 continue;
682
683 if (skb_copy == NULL) {
684 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
685 GFP_ATOMIC, true);
686
687 if (skb_copy == NULL)
688 continue;
689
690 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
691
692 data[0] = local->dev ? local->dev->idx : 0xFF;
693 data[1] = direction & 0x01;
694 data[1] |= (RAW_PAYLOAD_LLCP << 1);
695 }
696
697 nskb = skb_clone(skb_copy, GFP_ATOMIC);
698 if (!nskb)
699 continue;
700
701 if (sock_queue_rcv_skb(sk, nskb))
702 kfree_skb(nskb);
703 }
704
705 read_unlock(&local->raw_sockets.lock);
706
707 kfree_skb(skb_copy);
708 }
709
710 static void nfc_llcp_tx_work(struct work_struct *work)
711 {
712 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
713 tx_work);
714 struct sk_buff *skb;
715 struct sock *sk;
716 struct nfc_llcp_sock *llcp_sock;
717
718 skb = skb_dequeue(&local->tx_queue);
719 if (skb != NULL) {
720 sk = skb->sk;
721 llcp_sock = nfc_llcp_sock(sk);
722
723 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
724 kfree_skb(skb);
725 nfc_llcp_send_symm(local->dev);
726 } else if (llcp_sock && !llcp_sock->remote_ready) {
727 skb_queue_head(&local->tx_queue, skb);
728 nfc_llcp_send_symm(local->dev);
729 } else {
730 struct sk_buff *copy_skb = NULL;
731 u8 ptype = nfc_llcp_ptype(skb);
732 int ret;
733
734 pr_debug("Sending pending skb\n");
735 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
736 DUMP_PREFIX_OFFSET, 16, 1,
737 skb->data, skb->len, true);
738
739 if (ptype == LLCP_PDU_DISC && sk != NULL &&
740 sk->sk_state == LLCP_DISCONNECTING) {
741 nfc_llcp_sock_unlink(&local->sockets, sk);
742 sock_orphan(sk);
743 sock_put(sk);
744 }
745
746 if (ptype == LLCP_PDU_I)
747 copy_skb = skb_copy(skb, GFP_ATOMIC);
748
749 __net_timestamp(skb);
750
751 nfc_llcp_send_to_raw_sock(local, skb,
752 NFC_DIRECTION_TX);
753
754 ret = nfc_data_exchange(local->dev, local->target_idx,
755 skb, nfc_llcp_recv, local);
756
757 if (ret) {
758 kfree_skb(copy_skb);
759 goto out;
760 }
761
762 if (ptype == LLCP_PDU_I && copy_skb)
763 skb_queue_tail(&llcp_sock->tx_pending_queue,
764 copy_skb);
765 }
766 } else {
767 nfc_llcp_send_symm(local->dev);
768 }
769
770 out:
771 mod_timer(&local->link_timer,
772 jiffies + msecs_to_jiffies(2 * local->remote_lto));
773 }
774
775 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
776 u8 ssap)
777 {
778 struct sock *sk;
779 struct nfc_llcp_sock *llcp_sock;
780
781 read_lock(&local->connecting_sockets.lock);
782
783 sk_for_each(sk, &local->connecting_sockets.head) {
784 llcp_sock = nfc_llcp_sock(sk);
785
786 if (llcp_sock->ssap == ssap) {
787 sock_hold(&llcp_sock->sk);
788 goto out;
789 }
790 }
791
792 llcp_sock = NULL;
793
794 out:
795 read_unlock(&local->connecting_sockets.lock);
796
797 return llcp_sock;
798 }
799
800 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
801 u8 *sn, size_t sn_len)
802 {
803 struct nfc_llcp_sock *llcp_sock;
804
805 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
806
807 if (llcp_sock == NULL)
808 return NULL;
809
810 sock_hold(&llcp_sock->sk);
811
812 return llcp_sock;
813 }
814
815 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
816 {
817 u8 *tlv = &skb->data[2], type, length;
818 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
819
820 while (offset < tlv_array_len) {
821 type = tlv[0];
822 length = tlv[1];
823
824 pr_debug("type 0x%x length %d\n", type, length);
825
826 if (type == LLCP_TLV_SN) {
827 *sn_len = length;
828 return &tlv[2];
829 }
830
831 offset += length + 2;
832 tlv += length + 2;
833 }
834
835 return NULL;
836 }
837
838 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
839 struct sk_buff *skb)
840 {
841 struct nfc_llcp_sock *llcp_sock;
842 struct nfc_llcp_ui_cb *ui_cb;
843 u8 dsap, ssap;
844
845 dsap = nfc_llcp_dsap(skb);
846 ssap = nfc_llcp_ssap(skb);
847
848 ui_cb = nfc_llcp_ui_skb_cb(skb);
849 ui_cb->dsap = dsap;
850 ui_cb->ssap = ssap;
851
852 pr_debug("%d %d\n", dsap, ssap);
853
854 /* We're looking for a bound socket, not a client one */
855 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
856 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
857 return;
858
859 /* There is no sequence with UI frames */
860 skb_pull(skb, LLCP_HEADER_SIZE);
861 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
862 /*
863 * UI frames will be freed from the socket layer, so we
864 * need to keep them alive until someone receives them.
865 */
866 skb_get(skb);
867 } else {
868 pr_err("Receive queue is full\n");
869 }
870
871 nfc_llcp_sock_put(llcp_sock);
872 }
873
874 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
875 struct sk_buff *skb)
876 {
877 struct sock *new_sk, *parent;
878 struct nfc_llcp_sock *sock, *new_sock;
879 u8 dsap, ssap, reason;
880
881 dsap = nfc_llcp_dsap(skb);
882 ssap = nfc_llcp_ssap(skb);
883
884 pr_debug("%d %d\n", dsap, ssap);
885
886 if (dsap != LLCP_SAP_SDP) {
887 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
888 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
889 reason = LLCP_DM_NOBOUND;
890 goto fail;
891 }
892 } else {
893 u8 *sn;
894 size_t sn_len;
895
896 sn = nfc_llcp_connect_sn(skb, &sn_len);
897 if (sn == NULL) {
898 reason = LLCP_DM_NOBOUND;
899 goto fail;
900 }
901
902 pr_debug("Service name length %zu\n", sn_len);
903
904 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
905 if (sock == NULL) {
906 reason = LLCP_DM_NOBOUND;
907 goto fail;
908 }
909 }
910
911 lock_sock(&sock->sk);
912
913 parent = &sock->sk;
914
915 if (sk_acceptq_is_full(parent)) {
916 reason = LLCP_DM_REJ;
917 release_sock(&sock->sk);
918 sock_put(&sock->sk);
919 goto fail;
920 }
921
922 if (sock->ssap == LLCP_SDP_UNBOUND) {
923 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
924
925 pr_debug("First client, reserving %d\n", ssap);
926
927 if (ssap == LLCP_SAP_MAX) {
928 reason = LLCP_DM_REJ;
929 release_sock(&sock->sk);
930 sock_put(&sock->sk);
931 goto fail;
932 }
933
934 sock->ssap = ssap;
935 }
936
937 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
938 if (new_sk == NULL) {
939 reason = LLCP_DM_REJ;
940 release_sock(&sock->sk);
941 sock_put(&sock->sk);
942 goto fail;
943 }
944
945 new_sock = nfc_llcp_sock(new_sk);
946 new_sock->dev = local->dev;
947 new_sock->local = nfc_llcp_local_get(local);
948 new_sock->rw = sock->rw;
949 new_sock->miux = sock->miux;
950 new_sock->nfc_protocol = sock->nfc_protocol;
951 new_sock->dsap = ssap;
952 new_sock->target_idx = local->target_idx;
953 new_sock->parent = parent;
954 new_sock->ssap = sock->ssap;
955 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
956 atomic_t *client_count;
957
958 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
959
960 client_count =
961 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
962
963 atomic_inc(client_count);
964 new_sock->reserved_ssap = sock->ssap;
965 }
966
967 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
968 skb->len - LLCP_HEADER_SIZE);
969
970 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
971
972 nfc_llcp_sock_link(&local->sockets, new_sk);
973
974 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
975
976 nfc_get_device(local->dev->idx);
977
978 new_sk->sk_state = LLCP_CONNECTED;
979
980 /* Wake the listening processes */
981 parent->sk_data_ready(parent);
982
983 /* Send CC */
984 nfc_llcp_send_cc(new_sock);
985
986 release_sock(&sock->sk);
987 sock_put(&sock->sk);
988
989 return;
990
991 fail:
992 /* Send DM */
993 nfc_llcp_send_dm(local, dsap, ssap, reason);
994 }
995
996 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
997 {
998 int nr_frames = 0;
999 struct nfc_llcp_local *local = sock->local;
1000
1001 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1002 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1003 sock->remote_rw);
1004
1005 /* Try to queue some I frames for transmission */
1006 while (sock->remote_ready &&
1007 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1008 struct sk_buff *pdu;
1009
1010 pdu = skb_dequeue(&sock->tx_queue);
1011 if (pdu == NULL)
1012 break;
1013
1014 /* Update N(S)/N(R) */
1015 nfc_llcp_set_nrns(sock, pdu);
1016
1017 skb_queue_tail(&local->tx_queue, pdu);
1018 nr_frames++;
1019 }
1020
1021 return nr_frames;
1022 }
1023
1024 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1025 struct sk_buff *skb)
1026 {
1027 struct nfc_llcp_sock *llcp_sock;
1028 struct sock *sk;
1029 u8 dsap, ssap, ptype, ns, nr;
1030
1031 ptype = nfc_llcp_ptype(skb);
1032 dsap = nfc_llcp_dsap(skb);
1033 ssap = nfc_llcp_ssap(skb);
1034 ns = nfc_llcp_ns(skb);
1035 nr = nfc_llcp_nr(skb);
1036
1037 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1038
1039 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1040 if (llcp_sock == NULL) {
1041 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1042 return;
1043 }
1044
1045 sk = &llcp_sock->sk;
1046 lock_sock(sk);
1047 if (sk->sk_state == LLCP_CLOSED) {
1048 release_sock(sk);
1049 nfc_llcp_sock_put(llcp_sock);
1050 }
1051
1052 /* Pass the payload upstream */
1053 if (ptype == LLCP_PDU_I) {
1054 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1055
1056 if (ns == llcp_sock->recv_n)
1057 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1058 else
1059 pr_err("Received out of sequence I PDU\n");
1060
1061 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1062 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1063 /*
1064 * I frames will be freed from the socket layer, so we
1065 * need to keep them alive until someone receives them.
1066 */
1067 skb_get(skb);
1068 } else {
1069 pr_err("Receive queue is full\n");
1070 }
1071 }
1072
1073 /* Remove skbs from the pending queue */
1074 if (llcp_sock->send_ack_n != nr) {
1075 struct sk_buff *s, *tmp;
1076 u8 n;
1077
1078 llcp_sock->send_ack_n = nr;
1079
1080 /* Remove and free all skbs until ns == nr */
1081 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1082 n = nfc_llcp_ns(s);
1083
1084 skb_unlink(s, &llcp_sock->tx_pending_queue);
1085 kfree_skb(s);
1086
1087 if (n == nr)
1088 break;
1089 }
1090
1091 /* Re-queue the remaining skbs for transmission */
1092 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1093 s, tmp) {
1094 skb_unlink(s, &llcp_sock->tx_pending_queue);
1095 skb_queue_head(&local->tx_queue, s);
1096 }
1097 }
1098
1099 if (ptype == LLCP_PDU_RR)
1100 llcp_sock->remote_ready = true;
1101 else if (ptype == LLCP_PDU_RNR)
1102 llcp_sock->remote_ready = false;
1103
1104 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1105 nfc_llcp_send_rr(llcp_sock);
1106
1107 release_sock(sk);
1108 nfc_llcp_sock_put(llcp_sock);
1109 }
1110
1111 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1112 struct sk_buff *skb)
1113 {
1114 struct nfc_llcp_sock *llcp_sock;
1115 struct sock *sk;
1116 u8 dsap, ssap;
1117
1118 dsap = nfc_llcp_dsap(skb);
1119 ssap = nfc_llcp_ssap(skb);
1120
1121 if ((dsap == 0) && (ssap == 0)) {
1122 pr_debug("Connection termination");
1123 nfc_dep_link_down(local->dev);
1124 return;
1125 }
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_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1361 {
1362 u8 ptype;
1363 u16 pdu_len;
1364 struct sk_buff *new_skb;
1365
1366 if (skb->len <= LLCP_HEADER_SIZE) {
1367 pr_err("Malformed AGF PDU\n");
1368 return;
1369 }
1370
1371 skb_pull(skb, LLCP_HEADER_SIZE);
1372
1373 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1374 pdu_len = skb->data[0] << 8 | skb->data[1];
1375
1376 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1377
1378 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1379 pr_err("Malformed AGF PDU\n");
1380 return;
1381 }
1382
1383 ptype = nfc_llcp_ptype(skb);
1384
1385 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1386 goto next;
1387
1388 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1389 if (new_skb == NULL) {
1390 pr_err("Could not allocate PDU\n");
1391 return;
1392 }
1393
1394 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1395
1396 nfc_llcp_rx_skb(local, new_skb);
1397
1398 kfree_skb(new_skb);
1399 next:
1400 skb_pull(skb, pdu_len);
1401 }
1402 }
1403
1404 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1405 {
1406 u8 dsap, ssap, ptype;
1407
1408 ptype = nfc_llcp_ptype(skb);
1409 dsap = nfc_llcp_dsap(skb);
1410 ssap = nfc_llcp_ssap(skb);
1411
1412 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1413
1414 if (ptype != LLCP_PDU_SYMM)
1415 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1416 16, 1, skb->data, skb->len, true);
1417
1418 switch (ptype) {
1419 case LLCP_PDU_SYMM:
1420 pr_debug("SYMM\n");
1421 break;
1422
1423 case LLCP_PDU_UI:
1424 pr_debug("UI\n");
1425 nfc_llcp_recv_ui(local, skb);
1426 break;
1427
1428 case LLCP_PDU_CONNECT:
1429 pr_debug("CONNECT\n");
1430 nfc_llcp_recv_connect(local, skb);
1431 break;
1432
1433 case LLCP_PDU_DISC:
1434 pr_debug("DISC\n");
1435 nfc_llcp_recv_disc(local, skb);
1436 break;
1437
1438 case LLCP_PDU_CC:
1439 pr_debug("CC\n");
1440 nfc_llcp_recv_cc(local, skb);
1441 break;
1442
1443 case LLCP_PDU_DM:
1444 pr_debug("DM\n");
1445 nfc_llcp_recv_dm(local, skb);
1446 break;
1447
1448 case LLCP_PDU_SNL:
1449 pr_debug("SNL\n");
1450 nfc_llcp_recv_snl(local, skb);
1451 break;
1452
1453 case LLCP_PDU_I:
1454 case LLCP_PDU_RR:
1455 case LLCP_PDU_RNR:
1456 pr_debug("I frame\n");
1457 nfc_llcp_recv_hdlc(local, skb);
1458 break;
1459
1460 case LLCP_PDU_AGF:
1461 pr_debug("AGF frame\n");
1462 nfc_llcp_recv_agf(local, skb);
1463 break;
1464 }
1465 }
1466
1467 static void nfc_llcp_rx_work(struct work_struct *work)
1468 {
1469 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1470 rx_work);
1471 struct sk_buff *skb;
1472
1473 skb = local->rx_pending;
1474 if (skb == NULL) {
1475 pr_debug("No pending SKB\n");
1476 return;
1477 }
1478
1479 __net_timestamp(skb);
1480
1481 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1482
1483 nfc_llcp_rx_skb(local, skb);
1484
1485 schedule_work(&local->tx_work);
1486 kfree_skb(local->rx_pending);
1487 local->rx_pending = NULL;
1488 }
1489
1490 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1491 {
1492 local->rx_pending = skb;
1493 del_timer(&local->link_timer);
1494 schedule_work(&local->rx_work);
1495 }
1496
1497 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1498 {
1499 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1500
1501 pr_debug("Received an LLCP PDU\n");
1502 if (err < 0) {
1503 pr_err("err %d\n", err);
1504 return;
1505 }
1506
1507 __nfc_llcp_recv(local, skb);
1508 }
1509
1510 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1511 {
1512 struct nfc_llcp_local *local;
1513
1514 local = nfc_llcp_find_local(dev);
1515 if (local == NULL) {
1516 kfree_skb(skb);
1517 return -ENODEV;
1518 }
1519
1520 __nfc_llcp_recv(local, skb);
1521
1522 return 0;
1523 }
1524
1525 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1526 {
1527 struct nfc_llcp_local *local;
1528
1529 local = nfc_llcp_find_local(dev);
1530 if (local == NULL)
1531 return;
1532
1533 local->remote_miu = LLCP_DEFAULT_MIU;
1534 local->remote_lto = LLCP_DEFAULT_LTO;
1535
1536 /* Close and purge all existing sockets */
1537 nfc_llcp_socket_release(local, true, 0);
1538 }
1539
1540 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1541 u8 comm_mode, u8 rf_mode)
1542 {
1543 struct nfc_llcp_local *local;
1544
1545 pr_debug("rf mode %d\n", rf_mode);
1546
1547 local = nfc_llcp_find_local(dev);
1548 if (local == NULL)
1549 return;
1550
1551 local->target_idx = target_idx;
1552 local->comm_mode = comm_mode;
1553 local->rf_mode = rf_mode;
1554
1555 if (rf_mode == NFC_RF_INITIATOR) {
1556 pr_debug("Queueing Tx work\n");
1557
1558 schedule_work(&local->tx_work);
1559 } else {
1560 mod_timer(&local->link_timer,
1561 jiffies + msecs_to_jiffies(local->remote_lto));
1562 }
1563 }
1564
1565 int nfc_llcp_register_device(struct nfc_dev *ndev)
1566 {
1567 struct nfc_llcp_local *local;
1568
1569 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1570 if (local == NULL)
1571 return -ENOMEM;
1572
1573 local->dev = ndev;
1574 INIT_LIST_HEAD(&local->list);
1575 kref_init(&local->ref);
1576 mutex_init(&local->sdp_lock);
1577 init_timer(&local->link_timer);
1578 local->link_timer.data = (unsigned long) local;
1579 local->link_timer.function = nfc_llcp_symm_timer;
1580
1581 skb_queue_head_init(&local->tx_queue);
1582 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1583
1584 local->rx_pending = NULL;
1585 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1586
1587 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1588
1589 rwlock_init(&local->sockets.lock);
1590 rwlock_init(&local->connecting_sockets.lock);
1591 rwlock_init(&local->raw_sockets.lock);
1592
1593 local->lto = 150; /* 1500 ms */
1594 local->rw = LLCP_MAX_RW;
1595 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1596 local->local_wks = 0x1; /* LLC Link Management */
1597
1598 nfc_llcp_build_gb(local);
1599
1600 local->remote_miu = LLCP_DEFAULT_MIU;
1601 local->remote_lto = LLCP_DEFAULT_LTO;
1602
1603 mutex_init(&local->sdreq_lock);
1604 INIT_HLIST_HEAD(&local->pending_sdreqs);
1605 init_timer(&local->sdreq_timer);
1606 local->sdreq_timer.data = (unsigned long) local;
1607 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1608 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1609
1610 list_add(&local->list, &llcp_devices);
1611
1612 return 0;
1613 }
1614
1615 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1616 {
1617 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1618
1619 if (local == NULL) {
1620 pr_debug("No such device\n");
1621 return;
1622 }
1623
1624 local_cleanup(local);
1625
1626 nfc_llcp_local_put(local);
1627 }
1628
1629 int __init nfc_llcp_init(void)
1630 {
1631 return nfc_llcp_sock_init();
1632 }
1633
1634 void nfc_llcp_exit(void)
1635 {
1636 nfc_llcp_sock_exit();
1637 }
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