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, <o_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_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
736 16, 1, skb->data, skb->len, true);
737
738 if (ptype == LLCP_PDU_DISC && sk != NULL &&
739 sk->sk_state == LLCP_DISCONNECTING) {
740 nfc_llcp_sock_unlink(&local->sockets, sk);
741 sock_orphan(sk);
742 sock_put(sk);
743 }
744
745 if (ptype == LLCP_PDU_I)
746 copy_skb = skb_copy(skb, GFP_ATOMIC);
747
748 __net_timestamp(skb);
749
750 nfc_llcp_send_to_raw_sock(local, skb,
751 NFC_DIRECTION_TX);
752
753 ret = nfc_data_exchange(local->dev, local->target_idx,
754 skb, nfc_llcp_recv, local);
755
756 if (ret) {
757 kfree_skb(copy_skb);
758 goto out;
759 }
760
761 if (ptype == LLCP_PDU_I && copy_skb)
762 skb_queue_tail(&llcp_sock->tx_pending_queue,
763 copy_skb);
764 }
765 } else {
766 nfc_llcp_send_symm(local->dev);
767 }
768
769 out:
770 mod_timer(&local->link_timer,
771 jiffies + msecs_to_jiffies(2 * local->remote_lto));
772 }
773
774 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
775 u8 ssap)
776 {
777 struct sock *sk;
778 struct nfc_llcp_sock *llcp_sock;
779
780 read_lock(&local->connecting_sockets.lock);
781
782 sk_for_each(sk, &local->connecting_sockets.head) {
783 llcp_sock = nfc_llcp_sock(sk);
784
785 if (llcp_sock->ssap == ssap) {
786 sock_hold(&llcp_sock->sk);
787 goto out;
788 }
789 }
790
791 llcp_sock = NULL;
792
793 out:
794 read_unlock(&local->connecting_sockets.lock);
795
796 return llcp_sock;
797 }
798
799 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
800 u8 *sn, size_t sn_len)
801 {
802 struct nfc_llcp_sock *llcp_sock;
803
804 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
805
806 if (llcp_sock == NULL)
807 return NULL;
808
809 sock_hold(&llcp_sock->sk);
810
811 return llcp_sock;
812 }
813
814 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
815 {
816 u8 *tlv = &skb->data[2], type, length;
817 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
818
819 while (offset < tlv_array_len) {
820 type = tlv[0];
821 length = tlv[1];
822
823 pr_debug("type 0x%x length %d\n", type, length);
824
825 if (type == LLCP_TLV_SN) {
826 *sn_len = length;
827 return &tlv[2];
828 }
829
830 offset += length + 2;
831 tlv += length + 2;
832 }
833
834 return NULL;
835 }
836
837 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
838 struct sk_buff *skb)
839 {
840 struct nfc_llcp_sock *llcp_sock;
841 struct nfc_llcp_ui_cb *ui_cb;
842 u8 dsap, ssap;
843
844 dsap = nfc_llcp_dsap(skb);
845 ssap = nfc_llcp_ssap(skb);
846
847 ui_cb = nfc_llcp_ui_skb_cb(skb);
848 ui_cb->dsap = dsap;
849 ui_cb->ssap = ssap;
850
851 pr_debug("%d %d\n", dsap, ssap);
852
853 /* We're looking for a bound socket, not a client one */
854 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
855 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
856 return;
857
858 /* There is no sequence with UI frames */
859 skb_pull(skb, LLCP_HEADER_SIZE);
860 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
861 /*
862 * UI frames will be freed from the socket layer, so we
863 * need to keep them alive until someone receives them.
864 */
865 skb_get(skb);
866 } else {
867 pr_err("Receive queue is full\n");
868 }
869
870 nfc_llcp_sock_put(llcp_sock);
871 }
872
873 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
874 struct sk_buff *skb)
875 {
876 struct sock *new_sk, *parent;
877 struct nfc_llcp_sock *sock, *new_sock;
878 u8 dsap, ssap, reason;
879
880 dsap = nfc_llcp_dsap(skb);
881 ssap = nfc_llcp_ssap(skb);
882
883 pr_debug("%d %d\n", dsap, ssap);
884
885 if (dsap != LLCP_SAP_SDP) {
886 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
887 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
888 reason = LLCP_DM_NOBOUND;
889 goto fail;
890 }
891 } else {
892 u8 *sn;
893 size_t sn_len;
894
895 sn = nfc_llcp_connect_sn(skb, &sn_len);
896 if (sn == NULL) {
897 reason = LLCP_DM_NOBOUND;
898 goto fail;
899 }
900
901 pr_debug("Service name length %zu\n", sn_len);
902
903 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
904 if (sock == NULL) {
905 reason = LLCP_DM_NOBOUND;
906 goto fail;
907 }
908 }
909
910 lock_sock(&sock->sk);
911
912 parent = &sock->sk;
913
914 if (sk_acceptq_is_full(parent)) {
915 reason = LLCP_DM_REJ;
916 release_sock(&sock->sk);
917 sock_put(&sock->sk);
918 goto fail;
919 }
920
921 if (sock->ssap == LLCP_SDP_UNBOUND) {
922 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
923
924 pr_debug("First client, reserving %d\n", ssap);
925
926 if (ssap == LLCP_SAP_MAX) {
927 reason = LLCP_DM_REJ;
928 release_sock(&sock->sk);
929 sock_put(&sock->sk);
930 goto fail;
931 }
932
933 sock->ssap = ssap;
934 }
935
936 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
937 if (new_sk == NULL) {
938 reason = LLCP_DM_REJ;
939 release_sock(&sock->sk);
940 sock_put(&sock->sk);
941 goto fail;
942 }
943
944 new_sock = nfc_llcp_sock(new_sk);
945 new_sock->dev = local->dev;
946 new_sock->local = nfc_llcp_local_get(local);
947 new_sock->rw = sock->rw;
948 new_sock->miux = sock->miux;
949 new_sock->nfc_protocol = sock->nfc_protocol;
950 new_sock->dsap = ssap;
951 new_sock->target_idx = local->target_idx;
952 new_sock->parent = parent;
953 new_sock->ssap = sock->ssap;
954 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
955 atomic_t *client_count;
956
957 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
958
959 client_count =
960 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
961
962 atomic_inc(client_count);
963 new_sock->reserved_ssap = sock->ssap;
964 }
965
966 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
967 skb->len - LLCP_HEADER_SIZE);
968
969 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
970
971 nfc_llcp_sock_link(&local->sockets, new_sk);
972
973 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
974
975 nfc_get_device(local->dev->idx);
976
977 new_sk->sk_state = LLCP_CONNECTED;
978
979 /* Wake the listening processes */
980 parent->sk_data_ready(parent);
981
982 /* Send CC */
983 nfc_llcp_send_cc(new_sock);
984
985 release_sock(&sock->sk);
986 sock_put(&sock->sk);
987
988 return;
989
990 fail:
991 /* Send DM */
992 nfc_llcp_send_dm(local, dsap, ssap, reason);
993 }
994
995 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
996 {
997 int nr_frames = 0;
998 struct nfc_llcp_local *local = sock->local;
999
1000 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1001 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1002 sock->remote_rw);
1003
1004 /* Try to queue some I frames for transmission */
1005 while (sock->remote_ready &&
1006 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1007 struct sk_buff *pdu;
1008
1009 pdu = skb_dequeue(&sock->tx_queue);
1010 if (pdu == NULL)
1011 break;
1012
1013 /* Update N(S)/N(R) */
1014 nfc_llcp_set_nrns(sock, pdu);
1015
1016 skb_queue_tail(&local->tx_queue, pdu);
1017 nr_frames++;
1018 }
1019
1020 return nr_frames;
1021 }
1022
1023 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1024 struct sk_buff *skb)
1025 {
1026 struct nfc_llcp_sock *llcp_sock;
1027 struct sock *sk;
1028 u8 dsap, ssap, ptype, ns, nr;
1029
1030 ptype = nfc_llcp_ptype(skb);
1031 dsap = nfc_llcp_dsap(skb);
1032 ssap = nfc_llcp_ssap(skb);
1033 ns = nfc_llcp_ns(skb);
1034 nr = nfc_llcp_nr(skb);
1035
1036 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1037
1038 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1039 if (llcp_sock == NULL) {
1040 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1041 return;
1042 }
1043
1044 sk = &llcp_sock->sk;
1045 lock_sock(sk);
1046 if (sk->sk_state == LLCP_CLOSED) {
1047 release_sock(sk);
1048 nfc_llcp_sock_put(llcp_sock);
1049 }
1050
1051 /* Pass the payload upstream */
1052 if (ptype == LLCP_PDU_I) {
1053 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1054
1055 if (ns == llcp_sock->recv_n)
1056 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1057 else
1058 pr_err("Received out of sequence I PDU\n");
1059
1060 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1061 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1062 /*
1063 * I frames will be freed from the socket layer, so we
1064 * need to keep them alive until someone receives them.
1065 */
1066 skb_get(skb);
1067 } else {
1068 pr_err("Receive queue is full\n");
1069 }
1070 }
1071
1072 /* Remove skbs from the pending queue */
1073 if (llcp_sock->send_ack_n != nr) {
1074 struct sk_buff *s, *tmp;
1075 u8 n;
1076
1077 llcp_sock->send_ack_n = nr;
1078
1079 /* Remove and free all skbs until ns == nr */
1080 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1081 n = nfc_llcp_ns(s);
1082
1083 skb_unlink(s, &llcp_sock->tx_pending_queue);
1084 kfree_skb(s);
1085
1086 if (n == nr)
1087 break;
1088 }
1089
1090 /* Re-queue the remaining skbs for transmission */
1091 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1092 s, tmp) {
1093 skb_unlink(s, &llcp_sock->tx_pending_queue);
1094 skb_queue_head(&local->tx_queue, s);
1095 }
1096 }
1097
1098 if (ptype == LLCP_PDU_RR)
1099 llcp_sock->remote_ready = true;
1100 else if (ptype == LLCP_PDU_RNR)
1101 llcp_sock->remote_ready = false;
1102
1103 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1104 nfc_llcp_send_rr(llcp_sock);
1105
1106 release_sock(sk);
1107 nfc_llcp_sock_put(llcp_sock);
1108 }
1109
1110 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1111 struct sk_buff *skb)
1112 {
1113 struct nfc_llcp_sock *llcp_sock;
1114 struct sock *sk;
1115 u8 dsap, ssap;
1116
1117 dsap = nfc_llcp_dsap(skb);
1118 ssap = nfc_llcp_ssap(skb);
1119
1120 if ((dsap == 0) && (ssap == 0)) {
1121 pr_debug("Connection termination");
1122 nfc_dep_link_down(local->dev);
1123 return;
1124 }
1125
1126 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1127 if (llcp_sock == NULL) {
1128 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1129 return;
1130 }
1131
1132 sk = &llcp_sock->sk;
1133 lock_sock(sk);
1134
1135 nfc_llcp_socket_purge(llcp_sock);
1136
1137 if (sk->sk_state == LLCP_CLOSED) {
1138 release_sock(sk);
1139 nfc_llcp_sock_put(llcp_sock);
1140 }
1141
1142 if (sk->sk_state == LLCP_CONNECTED) {
1143 nfc_put_device(local->dev);
1144 sk->sk_state = LLCP_CLOSED;
1145 sk->sk_state_change(sk);
1146 }
1147
1148 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1149
1150 release_sock(sk);
1151 nfc_llcp_sock_put(llcp_sock);
1152 }
1153
1154 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1155 {
1156 struct nfc_llcp_sock *llcp_sock;
1157 struct sock *sk;
1158 u8 dsap, ssap;
1159
1160 dsap = nfc_llcp_dsap(skb);
1161 ssap = nfc_llcp_ssap(skb);
1162
1163 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1164 if (llcp_sock == NULL) {
1165 pr_err("Invalid CC\n");
1166 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1167
1168 return;
1169 }
1170
1171 sk = &llcp_sock->sk;
1172
1173 /* Unlink from connecting and link to the client array */
1174 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1175 nfc_llcp_sock_link(&local->sockets, sk);
1176 llcp_sock->dsap = ssap;
1177
1178 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1179 skb->len - LLCP_HEADER_SIZE);
1180
1181 sk->sk_state = LLCP_CONNECTED;
1182 sk->sk_state_change(sk);
1183
1184 nfc_llcp_sock_put(llcp_sock);
1185 }
1186
1187 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1188 {
1189 struct nfc_llcp_sock *llcp_sock;
1190 struct sock *sk;
1191 u8 dsap, ssap, reason;
1192
1193 dsap = nfc_llcp_dsap(skb);
1194 ssap = nfc_llcp_ssap(skb);
1195 reason = skb->data[2];
1196
1197 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1198
1199 switch (reason) {
1200 case LLCP_DM_NOBOUND:
1201 case LLCP_DM_REJ:
1202 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1203 break;
1204
1205 default:
1206 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1207 break;
1208 }
1209
1210 if (llcp_sock == NULL) {
1211 pr_debug("Already closed\n");
1212 return;
1213 }
1214
1215 sk = &llcp_sock->sk;
1216
1217 sk->sk_err = ENXIO;
1218 sk->sk_state = LLCP_CLOSED;
1219 sk->sk_state_change(sk);
1220
1221 nfc_llcp_sock_put(llcp_sock);
1222 }
1223
1224 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1225 struct sk_buff *skb)
1226 {
1227 struct nfc_llcp_sock *llcp_sock;
1228 u8 dsap, ssap, *tlv, type, length, tid, sap;
1229 u16 tlv_len, offset;
1230 char *service_name;
1231 size_t service_name_len;
1232 struct nfc_llcp_sdp_tlv *sdp;
1233 HLIST_HEAD(llc_sdres_list);
1234 size_t sdres_tlvs_len;
1235 HLIST_HEAD(nl_sdres_list);
1236
1237 dsap = nfc_llcp_dsap(skb);
1238 ssap = nfc_llcp_ssap(skb);
1239
1240 pr_debug("%d %d\n", dsap, ssap);
1241
1242 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243 pr_err("Wrong SNL SAP\n");
1244 return;
1245 }
1246
1247 tlv = &skb->data[LLCP_HEADER_SIZE];
1248 tlv_len = skb->len - LLCP_HEADER_SIZE;
1249 offset = 0;
1250 sdres_tlvs_len = 0;
1251
1252 while (offset < tlv_len) {
1253 type = tlv[0];
1254 length = tlv[1];
1255
1256 switch (type) {
1257 case LLCP_TLV_SDREQ:
1258 tid = tlv[2];
1259 service_name = (char *) &tlv[3];
1260 service_name_len = length - 1;
1261
1262 pr_debug("Looking for %.16s\n", service_name);
1263
1264 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265 !strncmp(service_name, "urn:nfc:sn:sdp",
1266 service_name_len)) {
1267 sap = 1;
1268 goto add_snl;
1269 }
1270
1271 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1272 service_name_len);
1273 if (!llcp_sock) {
1274 sap = 0;
1275 goto add_snl;
1276 }
1277
1278 /*
1279 * We found a socket but its ssap has not been reserved
1280 * yet. We need to assign it for good and send a reply.
1281 * The ssap will be freed when the socket is closed.
1282 */
1283 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284 atomic_t *client_count;
1285
1286 sap = nfc_llcp_reserve_sdp_ssap(local);
1287
1288 pr_debug("Reserving %d\n", sap);
1289
1290 if (sap == LLCP_SAP_MAX) {
1291 sap = 0;
1292 goto add_snl;
1293 }
1294
1295 client_count =
1296 &local->local_sdp_cnt[sap -
1297 LLCP_WKS_NUM_SAP];
1298
1299 atomic_inc(client_count);
1300
1301 llcp_sock->ssap = sap;
1302 llcp_sock->reserved_ssap = sap;
1303 } else {
1304 sap = llcp_sock->ssap;
1305 }
1306
1307 pr_debug("%p %d\n", llcp_sock, sap);
1308
1309 add_snl:
1310 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1311 if (sdp == NULL)
1312 goto exit;
1313
1314 sdres_tlvs_len += sdp->tlv_len;
1315 hlist_add_head(&sdp->node, &llc_sdres_list);
1316 break;
1317
1318 case LLCP_TLV_SDRES:
1319 mutex_lock(&local->sdreq_lock);
1320
1321 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1322
1323 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324 if (sdp->tid != tlv[2])
1325 continue;
1326
1327 sdp->sap = tlv[3];
1328
1329 pr_debug("Found: uri=%s, sap=%d\n",
1330 sdp->uri, sdp->sap);
1331
1332 hlist_del(&sdp->node);
1333
1334 hlist_add_head(&sdp->node, &nl_sdres_list);
1335
1336 break;
1337 }
1338
1339 mutex_unlock(&local->sdreq_lock);
1340 break;
1341
1342 default:
1343 pr_err("Invalid SNL tlv value 0x%x\n", type);
1344 break;
1345 }
1346
1347 offset += length + 2;
1348 tlv += length + 2;
1349 }
1350
1351 exit:
1352 if (!hlist_empty(&nl_sdres_list))
1353 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1354
1355 if (!hlist_empty(&llc_sdres_list))
1356 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1357 }
1358
1359 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1360 {
1361 u8 ptype;
1362 u16 pdu_len;
1363 struct sk_buff *new_skb;
1364
1365 if (skb->len <= LLCP_HEADER_SIZE) {
1366 pr_err("Malformed AGF PDU\n");
1367 return;
1368 }
1369
1370 skb_pull(skb, LLCP_HEADER_SIZE);
1371
1372 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373 pdu_len = skb->data[0] << 8 | skb->data[1];
1374
1375 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1376
1377 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378 pr_err("Malformed AGF PDU\n");
1379 return;
1380 }
1381
1382 ptype = nfc_llcp_ptype(skb);
1383
1384 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1385 goto next;
1386
1387 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388 if (new_skb == NULL) {
1389 pr_err("Could not allocate PDU\n");
1390 return;
1391 }
1392
1393 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1394
1395 nfc_llcp_rx_skb(local, new_skb);
1396
1397 kfree_skb(new_skb);
1398 next:
1399 skb_pull(skb, pdu_len);
1400 }
1401 }
1402
1403 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1404 {
1405 u8 dsap, ssap, ptype;
1406
1407 ptype = nfc_llcp_ptype(skb);
1408 dsap = nfc_llcp_dsap(skb);
1409 ssap = nfc_llcp_ssap(skb);
1410
1411 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1412
1413 if (ptype != LLCP_PDU_SYMM)
1414 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415 skb->data, skb->len, true);
1416
1417 switch (ptype) {
1418 case LLCP_PDU_SYMM:
1419 pr_debug("SYMM\n");
1420 break;
1421
1422 case LLCP_PDU_UI:
1423 pr_debug("UI\n");
1424 nfc_llcp_recv_ui(local, skb);
1425 break;
1426
1427 case LLCP_PDU_CONNECT:
1428 pr_debug("CONNECT\n");
1429 nfc_llcp_recv_connect(local, skb);
1430 break;
1431
1432 case LLCP_PDU_DISC:
1433 pr_debug("DISC\n");
1434 nfc_llcp_recv_disc(local, skb);
1435 break;
1436
1437 case LLCP_PDU_CC:
1438 pr_debug("CC\n");
1439 nfc_llcp_recv_cc(local, skb);
1440 break;
1441
1442 case LLCP_PDU_DM:
1443 pr_debug("DM\n");
1444 nfc_llcp_recv_dm(local, skb);
1445 break;
1446
1447 case LLCP_PDU_SNL:
1448 pr_debug("SNL\n");
1449 nfc_llcp_recv_snl(local, skb);
1450 break;
1451
1452 case LLCP_PDU_I:
1453 case LLCP_PDU_RR:
1454 case LLCP_PDU_RNR:
1455 pr_debug("I frame\n");
1456 nfc_llcp_recv_hdlc(local, skb);
1457 break;
1458
1459 case LLCP_PDU_AGF:
1460 pr_debug("AGF frame\n");
1461 nfc_llcp_recv_agf(local, skb);
1462 break;
1463 }
1464 }
1465
1466 static void nfc_llcp_rx_work(struct work_struct *work)
1467 {
1468 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1469 rx_work);
1470 struct sk_buff *skb;
1471
1472 skb = local->rx_pending;
1473 if (skb == NULL) {
1474 pr_debug("No pending SKB\n");
1475 return;
1476 }
1477
1478 __net_timestamp(skb);
1479
1480 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1481
1482 nfc_llcp_rx_skb(local, skb);
1483
1484 schedule_work(&local->tx_work);
1485 kfree_skb(local->rx_pending);
1486 local->rx_pending = NULL;
1487 }
1488
1489 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1490 {
1491 local->rx_pending = skb;
1492 del_timer(&local->link_timer);
1493 schedule_work(&local->rx_work);
1494 }
1495
1496 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1497 {
1498 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1499
1500 pr_debug("Received an LLCP PDU\n");
1501 if (err < 0) {
1502 pr_err("err %d\n", err);
1503 return;
1504 }
1505
1506 __nfc_llcp_recv(local, skb);
1507 }
1508
1509 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1510 {
1511 struct nfc_llcp_local *local;
1512
1513 local = nfc_llcp_find_local(dev);
1514 if (local == NULL) {
1515 kfree_skb(skb);
1516 return -ENODEV;
1517 }
1518
1519 __nfc_llcp_recv(local, skb);
1520
1521 return 0;
1522 }
1523
1524 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1525 {
1526 struct nfc_llcp_local *local;
1527
1528 local = nfc_llcp_find_local(dev);
1529 if (local == NULL)
1530 return;
1531
1532 local->remote_miu = LLCP_DEFAULT_MIU;
1533 local->remote_lto = LLCP_DEFAULT_LTO;
1534
1535 /* Close and purge all existing sockets */
1536 nfc_llcp_socket_release(local, true, 0);
1537 }
1538
1539 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1540 u8 comm_mode, u8 rf_mode)
1541 {
1542 struct nfc_llcp_local *local;
1543
1544 pr_debug("rf mode %d\n", rf_mode);
1545
1546 local = nfc_llcp_find_local(dev);
1547 if (local == NULL)
1548 return;
1549
1550 local->target_idx = target_idx;
1551 local->comm_mode = comm_mode;
1552 local->rf_mode = rf_mode;
1553
1554 if (rf_mode == NFC_RF_INITIATOR) {
1555 pr_debug("Queueing Tx work\n");
1556
1557 schedule_work(&local->tx_work);
1558 } else {
1559 mod_timer(&local->link_timer,
1560 jiffies + msecs_to_jiffies(local->remote_lto));
1561 }
1562 }
1563
1564 int nfc_llcp_register_device(struct nfc_dev *ndev)
1565 {
1566 struct nfc_llcp_local *local;
1567
1568 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1569 if (local == NULL)
1570 return -ENOMEM;
1571
1572 local->dev = ndev;
1573 INIT_LIST_HEAD(&local->list);
1574 kref_init(&local->ref);
1575 mutex_init(&local->sdp_lock);
1576 init_timer(&local->link_timer);
1577 local->link_timer.data = (unsigned long) local;
1578 local->link_timer.function = nfc_llcp_symm_timer;
1579
1580 skb_queue_head_init(&local->tx_queue);
1581 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1582
1583 local->rx_pending = NULL;
1584 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1585
1586 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1587
1588 rwlock_init(&local->sockets.lock);
1589 rwlock_init(&local->connecting_sockets.lock);
1590 rwlock_init(&local->raw_sockets.lock);
1591
1592 local->lto = 150; /* 1500 ms */
1593 local->rw = LLCP_MAX_RW;
1594 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1595 local->local_wks = 0x1; /* LLC Link Management */
1596
1597 nfc_llcp_build_gb(local);
1598
1599 local->remote_miu = LLCP_DEFAULT_MIU;
1600 local->remote_lto = LLCP_DEFAULT_LTO;
1601
1602 mutex_init(&local->sdreq_lock);
1603 INIT_HLIST_HEAD(&local->pending_sdreqs);
1604 init_timer(&local->sdreq_timer);
1605 local->sdreq_timer.data = (unsigned long) local;
1606 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1607 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1608
1609 list_add(&local->list, &llcp_devices);
1610
1611 return 0;
1612 }
1613
1614 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1615 {
1616 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1617
1618 if (local == NULL) {
1619 pr_debug("No such device\n");
1620 return;
1621 }
1622
1623 local_cleanup(local);
1624
1625 nfc_llcp_local_put(local);
1626 }
1627
1628 int __init nfc_llcp_init(void)
1629 {
1630 return nfc_llcp_sock_init();
1631 }
1632
1633 void nfc_llcp_exit(void)
1634 {
1635 nfc_llcp_sock_exit();
1636 }
1637
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