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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2011 Intel Corporation. All rights reserved.
4 * Copyright (C) 2014 Marvell International Ltd.
5 */
6
7#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
8
9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/list.h>
12#include <linux/nfc.h>
13
14#include "nfc.h"
15#include "llcp.h"
16
17static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
18
19static LIST_HEAD(llcp_devices);
20
21static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
22
23void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
24{
25 write_lock(&l->lock);
26 sk_add_node(sk, &l->head);
27 write_unlock(&l->lock);
28}
29
30void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
31{
32 write_lock(&l->lock);
33 sk_del_node_init(sk);
34 write_unlock(&l->lock);
35}
36
37void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
38{
39 sock->remote_rw = LLCP_DEFAULT_RW;
40 sock->remote_miu = LLCP_MAX_MIU + 1;
41}
42
43static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
44{
45 struct nfc_llcp_local *local = sock->local;
46 struct sk_buff *s, *tmp;
47
48 skb_queue_purge(&sock->tx_queue);
49 skb_queue_purge(&sock->tx_pending_queue);
50
51 if (local == NULL)
52 return;
53
54 /* Search for local pending SKBs that are related to this socket */
55 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
56 if (s->sk != &sock->sk)
57 continue;
58
59 skb_unlink(s, &local->tx_queue);
60 kfree_skb(s);
61 }
62}
63
64static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
65 int err)
66{
67 struct sock *sk;
68 struct hlist_node *tmp;
69 struct nfc_llcp_sock *llcp_sock;
70
71 skb_queue_purge(&local->tx_queue);
72
73 write_lock(&local->sockets.lock);
74
75 sk_for_each_safe(sk, tmp, &local->sockets.head) {
76 llcp_sock = nfc_llcp_sock(sk);
77
78 bh_lock_sock(sk);
79
80 nfc_llcp_socket_purge(llcp_sock);
81
82 if (sk->sk_state == LLCP_CONNECTED)
83 nfc_put_device(llcp_sock->dev);
84
85 if (sk->sk_state == LLCP_LISTEN) {
86 struct nfc_llcp_sock *lsk, *n;
87 struct sock *accept_sk;
88
89 list_for_each_entry_safe(lsk, n,
90 &llcp_sock->accept_queue,
91 accept_queue) {
92 accept_sk = &lsk->sk;
93 bh_lock_sock(accept_sk);
94
95 nfc_llcp_accept_unlink(accept_sk);
96
97 if (err)
98 accept_sk->sk_err = err;
99 accept_sk->sk_state = LLCP_CLOSED;
100 accept_sk->sk_state_change(sk);
101
102 bh_unlock_sock(accept_sk);
103 }
104 }
105
106 if (err)
107 sk->sk_err = err;
108 sk->sk_state = LLCP_CLOSED;
109 sk->sk_state_change(sk);
110
111 bh_unlock_sock(sk);
112
113 sk_del_node_init(sk);
114 }
115
116 write_unlock(&local->sockets.lock);
117
118 /* If we still have a device, we keep the RAW sockets alive */
119 if (device == true)
120 return;
121
122 write_lock(&local->raw_sockets.lock);
123
124 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
125 llcp_sock = nfc_llcp_sock(sk);
126
127 bh_lock_sock(sk);
128
129 nfc_llcp_socket_purge(llcp_sock);
130
131 if (err)
132 sk->sk_err = err;
133 sk->sk_state = LLCP_CLOSED;
134 sk->sk_state_change(sk);
135
136 bh_unlock_sock(sk);
137
138 sk_del_node_init(sk);
139 }
140
141 write_unlock(&local->raw_sockets.lock);
142}
143
144struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
145{
146 kref_get(&local->ref);
147
148 return local;
149}
150
151static void local_cleanup(struct nfc_llcp_local *local)
152{
153 nfc_llcp_socket_release(local, false, ENXIO);
154 del_timer_sync(&local->link_timer);
155 skb_queue_purge(&local->tx_queue);
156 cancel_work_sync(&local->tx_work);
157 cancel_work_sync(&local->rx_work);
158 cancel_work_sync(&local->timeout_work);
159 kfree_skb(local->rx_pending);
160 local->rx_pending = NULL;
161 del_timer_sync(&local->sdreq_timer);
162 cancel_work_sync(&local->sdreq_timeout_work);
163 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
164}
165
166static void local_release(struct kref *ref)
167{
168 struct nfc_llcp_local *local;
169
170 local = container_of(ref, struct nfc_llcp_local, ref);
171
172 list_del(&local->list);
173 local_cleanup(local);
174 kfree(local);
175}
176
177int nfc_llcp_local_put(struct nfc_llcp_local *local)
178{
179 if (local == NULL)
180 return 0;
181
182 return kref_put(&local->ref, local_release);
183}
184
185static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
186 u8 ssap, u8 dsap)
187{
188 struct sock *sk;
189 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
190
191 pr_debug("ssap dsap %d %d\n", ssap, dsap);
192
193 if (ssap == 0 && dsap == 0)
194 return NULL;
195
196 read_lock(&local->sockets.lock);
197
198 llcp_sock = NULL;
199
200 sk_for_each(sk, &local->sockets.head) {
201 tmp_sock = nfc_llcp_sock(sk);
202
203 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
204 llcp_sock = tmp_sock;
205 break;
206 }
207 }
208
209 read_unlock(&local->sockets.lock);
210
211 if (llcp_sock == NULL)
212 return NULL;
213
214 sock_hold(&llcp_sock->sk);
215
216 return llcp_sock;
217}
218
219static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
220{
221 sock_put(&sock->sk);
222}
223
224static void nfc_llcp_timeout_work(struct work_struct *work)
225{
226 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
227 timeout_work);
228
229 nfc_dep_link_down(local->dev);
230}
231
232static void nfc_llcp_symm_timer(struct timer_list *t)
233{
234 struct nfc_llcp_local *local = from_timer(local, t, link_timer);
235
236 pr_err("SYMM timeout\n");
237
238 schedule_work(&local->timeout_work);
239}
240
241static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
242{
243 unsigned long time;
244 HLIST_HEAD(nl_sdres_list);
245 struct hlist_node *n;
246 struct nfc_llcp_sdp_tlv *sdp;
247 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
248 sdreq_timeout_work);
249
250 mutex_lock(&local->sdreq_lock);
251
252 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
253
254 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
255 if (time_after(sdp->time, time))
256 continue;
257
258 sdp->sap = LLCP_SDP_UNBOUND;
259
260 hlist_del(&sdp->node);
261
262 hlist_add_head(&sdp->node, &nl_sdres_list);
263 }
264
265 if (!hlist_empty(&local->pending_sdreqs))
266 mod_timer(&local->sdreq_timer,
267 jiffies + msecs_to_jiffies(3 * local->remote_lto));
268
269 mutex_unlock(&local->sdreq_lock);
270
271 if (!hlist_empty(&nl_sdres_list))
272 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
273}
274
275static void nfc_llcp_sdreq_timer(struct timer_list *t)
276{
277 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
278
279 schedule_work(&local->sdreq_timeout_work);
280}
281
282struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
283{
284 struct nfc_llcp_local *local;
285
286 list_for_each_entry(local, &llcp_devices, list)
287 if (local->dev == dev)
288 return local;
289
290 pr_debug("No device found\n");
291
292 return NULL;
293}
294
295static char *wks[] = {
296 NULL,
297 NULL, /* SDP */
298 "urn:nfc:sn:ip",
299 "urn:nfc:sn:obex",
300 "urn:nfc:sn:snep",
301};
302
303static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
304{
305 int sap, num_wks;
306
307 pr_debug("%s\n", service_name);
308
309 if (service_name == NULL)
310 return -EINVAL;
311
312 num_wks = ARRAY_SIZE(wks);
313
314 for (sap = 0; sap < num_wks; sap++) {
315 if (wks[sap] == NULL)
316 continue;
317
318 if (strncmp(wks[sap], service_name, service_name_len) == 0)
319 return sap;
320 }
321
322 return -EINVAL;
323}
324
325static
326struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
327 const u8 *sn, size_t sn_len)
328{
329 struct sock *sk;
330 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
331
332 pr_debug("sn %zd %p\n", sn_len, sn);
333
334 if (sn == NULL || sn_len == 0)
335 return NULL;
336
337 read_lock(&local->sockets.lock);
338
339 llcp_sock = NULL;
340
341 sk_for_each(sk, &local->sockets.head) {
342 tmp_sock = nfc_llcp_sock(sk);
343
344 pr_debug("llcp sock %p\n", tmp_sock);
345
346 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
347 tmp_sock->sk.sk_state != LLCP_LISTEN)
348 continue;
349
350 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
351 tmp_sock->sk.sk_state != LLCP_BOUND)
352 continue;
353
354 if (tmp_sock->service_name == NULL ||
355 tmp_sock->service_name_len == 0)
356 continue;
357
358 if (tmp_sock->service_name_len != sn_len)
359 continue;
360
361 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
362 llcp_sock = tmp_sock;
363 break;
364 }
365 }
366
367 read_unlock(&local->sockets.lock);
368
369 pr_debug("Found llcp sock %p\n", llcp_sock);
370
371 return llcp_sock;
372}
373
374u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
375 struct nfc_llcp_sock *sock)
376{
377 mutex_lock(&local->sdp_lock);
378
379 if (sock->service_name != NULL && sock->service_name_len > 0) {
380 int ssap = nfc_llcp_wks_sap(sock->service_name,
381 sock->service_name_len);
382
383 if (ssap > 0) {
384 pr_debug("WKS %d\n", ssap);
385
386 /* This is a WKS, let's check if it's free */
387 if (test_bit(ssap, &local->local_wks)) {
388 mutex_unlock(&local->sdp_lock);
389
390 return LLCP_SAP_MAX;
391 }
392
393 set_bit(ssap, &local->local_wks);
394 mutex_unlock(&local->sdp_lock);
395
396 return ssap;
397 }
398
399 /*
400 * Check if there already is a non WKS socket bound
401 * to this service name.
402 */
403 if (nfc_llcp_sock_from_sn(local, sock->service_name,
404 sock->service_name_len) != NULL) {
405 mutex_unlock(&local->sdp_lock);
406
407 return LLCP_SAP_MAX;
408 }
409
410 mutex_unlock(&local->sdp_lock);
411
412 return LLCP_SDP_UNBOUND;
413
414 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
415 if (!test_bit(sock->ssap, &local->local_wks)) {
416 set_bit(sock->ssap, &local->local_wks);
417 mutex_unlock(&local->sdp_lock);
418
419 return sock->ssap;
420 }
421 }
422
423 mutex_unlock(&local->sdp_lock);
424
425 return LLCP_SAP_MAX;
426}
427
428u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
429{
430 u8 local_ssap;
431
432 mutex_lock(&local->sdp_lock);
433
434 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
435 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
436 mutex_unlock(&local->sdp_lock);
437 return LLCP_SAP_MAX;
438 }
439
440 set_bit(local_ssap, &local->local_sap);
441
442 mutex_unlock(&local->sdp_lock);
443
444 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
445}
446
447void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
448{
449 u8 local_ssap;
450 unsigned long *sdp;
451
452 if (ssap < LLCP_WKS_NUM_SAP) {
453 local_ssap = ssap;
454 sdp = &local->local_wks;
455 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
456 atomic_t *client_cnt;
457
458 local_ssap = ssap - LLCP_WKS_NUM_SAP;
459 sdp = &local->local_sdp;
460 client_cnt = &local->local_sdp_cnt[local_ssap];
461
462 pr_debug("%d clients\n", atomic_read(client_cnt));
463
464 mutex_lock(&local->sdp_lock);
465
466 if (atomic_dec_and_test(client_cnt)) {
467 struct nfc_llcp_sock *l_sock;
468
469 pr_debug("No more clients for SAP %d\n", ssap);
470
471 clear_bit(local_ssap, sdp);
472
473 /* Find the listening sock and set it back to UNBOUND */
474 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
475 if (l_sock) {
476 l_sock->ssap = LLCP_SDP_UNBOUND;
477 nfc_llcp_sock_put(l_sock);
478 }
479 }
480
481 mutex_unlock(&local->sdp_lock);
482
483 return;
484 } else if (ssap < LLCP_MAX_SAP) {
485 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
486 sdp = &local->local_sap;
487 } else {
488 return;
489 }
490
491 mutex_lock(&local->sdp_lock);
492
493 clear_bit(local_ssap, sdp);
494
495 mutex_unlock(&local->sdp_lock);
496}
497
498static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
499{
500 u8 ssap;
501
502 mutex_lock(&local->sdp_lock);
503
504 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
505 if (ssap == LLCP_SDP_NUM_SAP) {
506 mutex_unlock(&local->sdp_lock);
507
508 return LLCP_SAP_MAX;
509 }
510
511 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
512
513 set_bit(ssap, &local->local_sdp);
514
515 mutex_unlock(&local->sdp_lock);
516
517 return LLCP_WKS_NUM_SAP + ssap;
518}
519
520static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
521{
522 u8 *gb_cur, version, version_length;
523 u8 lto_length, wks_length, miux_length;
524 const u8 *version_tlv = NULL, *lto_tlv = NULL,
525 *wks_tlv = NULL, *miux_tlv = NULL;
526 __be16 wks = cpu_to_be16(local->local_wks);
527 u8 gb_len = 0;
528 int ret = 0;
529
530 version = LLCP_VERSION_11;
531 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
532 1, &version_length);
533 if (!version_tlv) {
534 ret = -ENOMEM;
535 goto out;
536 }
537 gb_len += version_length;
538
539 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
540 if (!lto_tlv) {
541 ret = -ENOMEM;
542 goto out;
543 }
544 gb_len += lto_length;
545
546 pr_debug("Local wks 0x%lx\n", local->local_wks);
547 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
548 if (!wks_tlv) {
549 ret = -ENOMEM;
550 goto out;
551 }
552 gb_len += wks_length;
553
554 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
555 &miux_length);
556 if (!miux_tlv) {
557 ret = -ENOMEM;
558 goto out;
559 }
560 gb_len += miux_length;
561
562 gb_len += ARRAY_SIZE(llcp_magic);
563
564 if (gb_len > NFC_MAX_GT_LEN) {
565 ret = -EINVAL;
566 goto out;
567 }
568
569 gb_cur = local->gb;
570
571 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
572 gb_cur += ARRAY_SIZE(llcp_magic);
573
574 memcpy(gb_cur, version_tlv, version_length);
575 gb_cur += version_length;
576
577 memcpy(gb_cur, lto_tlv, lto_length);
578 gb_cur += lto_length;
579
580 memcpy(gb_cur, wks_tlv, wks_length);
581 gb_cur += wks_length;
582
583 memcpy(gb_cur, miux_tlv, miux_length);
584 gb_cur += miux_length;
585
586 local->gb_len = gb_len;
587
588out:
589 kfree(version_tlv);
590 kfree(lto_tlv);
591 kfree(wks_tlv);
592 kfree(miux_tlv);
593
594 return ret;
595}
596
597u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
598{
599 struct nfc_llcp_local *local;
600
601 local = nfc_llcp_find_local(dev);
602 if (local == NULL) {
603 *general_bytes_len = 0;
604 return NULL;
605 }
606
607 nfc_llcp_build_gb(local);
608
609 *general_bytes_len = local->gb_len;
610
611 return local->gb;
612}
613
614int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
615{
616 struct nfc_llcp_local *local;
617
618 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
619 return -EINVAL;
620
621 local = nfc_llcp_find_local(dev);
622 if (local == NULL) {
623 pr_err("No LLCP device\n");
624 return -ENODEV;
625 }
626
627 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
628 memcpy(local->remote_gb, gb, gb_len);
629 local->remote_gb_len = gb_len;
630
631 if (memcmp(local->remote_gb, llcp_magic, 3)) {
632 pr_err("MAC does not support LLCP\n");
633 return -EINVAL;
634 }
635
636 return nfc_llcp_parse_gb_tlv(local,
637 &local->remote_gb[3],
638 local->remote_gb_len - 3);
639}
640
641static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
642{
643 return (pdu->data[0] & 0xfc) >> 2;
644}
645
646static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
647{
648 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
649}
650
651static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
652{
653 return pdu->data[1] & 0x3f;
654}
655
656static u8 nfc_llcp_ns(const struct sk_buff *pdu)
657{
658 return pdu->data[2] >> 4;
659}
660
661static u8 nfc_llcp_nr(const struct sk_buff *pdu)
662{
663 return pdu->data[2] & 0xf;
664}
665
666static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
667{
668 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
669 sock->send_n = (sock->send_n + 1) % 16;
670 sock->recv_ack_n = (sock->recv_n - 1) % 16;
671}
672
673void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
674 struct sk_buff *skb, u8 direction)
675{
676 struct sk_buff *skb_copy = NULL, *nskb;
677 struct sock *sk;
678 u8 *data;
679
680 read_lock(&local->raw_sockets.lock);
681
682 sk_for_each(sk, &local->raw_sockets.head) {
683 if (sk->sk_state != LLCP_BOUND)
684 continue;
685
686 if (skb_copy == NULL) {
687 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
688 GFP_ATOMIC, true);
689
690 if (skb_copy == NULL)
691 continue;
692
693 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
694
695 data[0] = local->dev ? local->dev->idx : 0xFF;
696 data[1] = direction & 0x01;
697 data[1] |= (RAW_PAYLOAD_LLCP << 1);
698 }
699
700 nskb = skb_clone(skb_copy, GFP_ATOMIC);
701 if (!nskb)
702 continue;
703
704 if (sock_queue_rcv_skb(sk, nskb))
705 kfree_skb(nskb);
706 }
707
708 read_unlock(&local->raw_sockets.lock);
709
710 kfree_skb(skb_copy);
711}
712
713static void nfc_llcp_tx_work(struct work_struct *work)
714{
715 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
716 tx_work);
717 struct sk_buff *skb;
718 struct sock *sk;
719 struct nfc_llcp_sock *llcp_sock;
720
721 skb = skb_dequeue(&local->tx_queue);
722 if (skb != NULL) {
723 sk = skb->sk;
724 llcp_sock = nfc_llcp_sock(sk);
725
726 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
727 kfree_skb(skb);
728 nfc_llcp_send_symm(local->dev);
729 } else if (llcp_sock && !llcp_sock->remote_ready) {
730 skb_queue_head(&local->tx_queue, skb);
731 nfc_llcp_send_symm(local->dev);
732 } else {
733 struct sk_buff *copy_skb = NULL;
734 u8 ptype = nfc_llcp_ptype(skb);
735 int ret;
736
737 pr_debug("Sending pending skb\n");
738 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
739 16, 1, skb->data, skb->len, true);
740
741 if (ptype == LLCP_PDU_I)
742 copy_skb = skb_copy(skb, GFP_ATOMIC);
743
744 __net_timestamp(skb);
745
746 nfc_llcp_send_to_raw_sock(local, skb,
747 NFC_DIRECTION_TX);
748
749 ret = nfc_data_exchange(local->dev, local->target_idx,
750 skb, nfc_llcp_recv, local);
751
752 if (ret) {
753 kfree_skb(copy_skb);
754 goto out;
755 }
756
757 if (ptype == LLCP_PDU_I && copy_skb)
758 skb_queue_tail(&llcp_sock->tx_pending_queue,
759 copy_skb);
760 }
761 } else {
762 nfc_llcp_send_symm(local->dev);
763 }
764
765out:
766 mod_timer(&local->link_timer,
767 jiffies + msecs_to_jiffies(2 * local->remote_lto));
768}
769
770static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
771 u8 ssap)
772{
773 struct sock *sk;
774 struct nfc_llcp_sock *llcp_sock;
775
776 read_lock(&local->connecting_sockets.lock);
777
778 sk_for_each(sk, &local->connecting_sockets.head) {
779 llcp_sock = nfc_llcp_sock(sk);
780
781 if (llcp_sock->ssap == ssap) {
782 sock_hold(&llcp_sock->sk);
783 goto out;
784 }
785 }
786
787 llcp_sock = NULL;
788
789out:
790 read_unlock(&local->connecting_sockets.lock);
791
792 return llcp_sock;
793}
794
795static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
796 const u8 *sn, size_t sn_len)
797{
798 struct nfc_llcp_sock *llcp_sock;
799
800 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
801
802 if (llcp_sock == NULL)
803 return NULL;
804
805 sock_hold(&llcp_sock->sk);
806
807 return llcp_sock;
808}
809
810static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
811{
812 u8 type, length;
813 const u8 *tlv = &skb->data[2];
814 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
815
816 while (offset < tlv_array_len) {
817 type = tlv[0];
818 length = tlv[1];
819
820 pr_debug("type 0x%x length %d\n", type, length);
821
822 if (type == LLCP_TLV_SN) {
823 *sn_len = length;
824 return &tlv[2];
825 }
826
827 offset += length + 2;
828 tlv += length + 2;
829 }
830
831 return NULL;
832}
833
834static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
835 struct sk_buff *skb)
836{
837 struct nfc_llcp_sock *llcp_sock;
838 struct nfc_llcp_ui_cb *ui_cb;
839 u8 dsap, ssap;
840
841 dsap = nfc_llcp_dsap(skb);
842 ssap = nfc_llcp_ssap(skb);
843
844 ui_cb = nfc_llcp_ui_skb_cb(skb);
845 ui_cb->dsap = dsap;
846 ui_cb->ssap = ssap;
847
848 pr_debug("%d %d\n", dsap, ssap);
849
850 /* We're looking for a bound socket, not a client one */
851 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
852 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
853 return;
854
855 /* There is no sequence with UI frames */
856 skb_pull(skb, LLCP_HEADER_SIZE);
857 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
858 /*
859 * UI frames will be freed from the socket layer, so we
860 * need to keep them alive until someone receives them.
861 */
862 skb_get(skb);
863 } else {
864 pr_err("Receive queue is full\n");
865 }
866
867 nfc_llcp_sock_put(llcp_sock);
868}
869
870static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
871 const struct sk_buff *skb)
872{
873 struct sock *new_sk, *parent;
874 struct nfc_llcp_sock *sock, *new_sock;
875 u8 dsap, ssap, reason;
876
877 dsap = nfc_llcp_dsap(skb);
878 ssap = nfc_llcp_ssap(skb);
879
880 pr_debug("%d %d\n", dsap, ssap);
881
882 if (dsap != LLCP_SAP_SDP) {
883 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
884 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
885 reason = LLCP_DM_NOBOUND;
886 goto fail;
887 }
888 } else {
889 const u8 *sn;
890 size_t sn_len;
891
892 sn = nfc_llcp_connect_sn(skb, &sn_len);
893 if (sn == NULL) {
894 reason = LLCP_DM_NOBOUND;
895 goto fail;
896 }
897
898 pr_debug("Service name length %zu\n", sn_len);
899
900 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
901 if (sock == NULL) {
902 reason = LLCP_DM_NOBOUND;
903 goto fail;
904 }
905 }
906
907 lock_sock(&sock->sk);
908
909 parent = &sock->sk;
910
911 if (sk_acceptq_is_full(parent)) {
912 reason = LLCP_DM_REJ;
913 release_sock(&sock->sk);
914 sock_put(&sock->sk);
915 goto fail;
916 }
917
918 if (sock->ssap == LLCP_SDP_UNBOUND) {
919 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
920
921 pr_debug("First client, reserving %d\n", ssap);
922
923 if (ssap == LLCP_SAP_MAX) {
924 reason = LLCP_DM_REJ;
925 release_sock(&sock->sk);
926 sock_put(&sock->sk);
927 goto fail;
928 }
929
930 sock->ssap = ssap;
931 }
932
933 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
934 if (new_sk == NULL) {
935 reason = LLCP_DM_REJ;
936 release_sock(&sock->sk);
937 sock_put(&sock->sk);
938 goto fail;
939 }
940
941 new_sock = nfc_llcp_sock(new_sk);
942 new_sock->dev = local->dev;
943 new_sock->local = nfc_llcp_local_get(local);
944 new_sock->rw = sock->rw;
945 new_sock->miux = sock->miux;
946 new_sock->nfc_protocol = sock->nfc_protocol;
947 new_sock->dsap = ssap;
948 new_sock->target_idx = local->target_idx;
949 new_sock->parent = parent;
950 new_sock->ssap = sock->ssap;
951 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
952 atomic_t *client_count;
953
954 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
955
956 client_count =
957 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
958
959 atomic_inc(client_count);
960 new_sock->reserved_ssap = sock->ssap;
961 }
962
963 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
964 skb->len - LLCP_HEADER_SIZE);
965
966 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
967
968 nfc_llcp_sock_link(&local->sockets, new_sk);
969
970 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
971
972 nfc_get_device(local->dev->idx);
973
974 new_sk->sk_state = LLCP_CONNECTED;
975
976 /* Wake the listening processes */
977 parent->sk_data_ready(parent);
978
979 /* Send CC */
980 nfc_llcp_send_cc(new_sock);
981
982 release_sock(&sock->sk);
983 sock_put(&sock->sk);
984
985 return;
986
987fail:
988 /* Send DM */
989 nfc_llcp_send_dm(local, dsap, ssap, reason);
990}
991
992int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
993{
994 int nr_frames = 0;
995 struct nfc_llcp_local *local = sock->local;
996
997 pr_debug("Remote ready %d tx queue len %d remote rw %d",
998 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
999 sock->remote_rw);
1000
1001 /* Try to queue some I frames for transmission */
1002 while (sock->remote_ready &&
1003 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1004 struct sk_buff *pdu;
1005
1006 pdu = skb_dequeue(&sock->tx_queue);
1007 if (pdu == NULL)
1008 break;
1009
1010 /* Update N(S)/N(R) */
1011 nfc_llcp_set_nrns(sock, pdu);
1012
1013 skb_queue_tail(&local->tx_queue, pdu);
1014 nr_frames++;
1015 }
1016
1017 return nr_frames;
1018}
1019
1020static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1021 struct sk_buff *skb)
1022{
1023 struct nfc_llcp_sock *llcp_sock;
1024 struct sock *sk;
1025 u8 dsap, ssap, ptype, ns, nr;
1026
1027 ptype = nfc_llcp_ptype(skb);
1028 dsap = nfc_llcp_dsap(skb);
1029 ssap = nfc_llcp_ssap(skb);
1030 ns = nfc_llcp_ns(skb);
1031 nr = nfc_llcp_nr(skb);
1032
1033 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1034
1035 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1036 if (llcp_sock == NULL) {
1037 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1038 return;
1039 }
1040
1041 sk = &llcp_sock->sk;
1042 lock_sock(sk);
1043 if (sk->sk_state == LLCP_CLOSED) {
1044 release_sock(sk);
1045 nfc_llcp_sock_put(llcp_sock);
1046 }
1047
1048 /* Pass the payload upstream */
1049 if (ptype == LLCP_PDU_I) {
1050 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1051
1052 if (ns == llcp_sock->recv_n)
1053 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1054 else
1055 pr_err("Received out of sequence I PDU\n");
1056
1057 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1058 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1059 /*
1060 * I frames will be freed from the socket layer, so we
1061 * need to keep them alive until someone receives them.
1062 */
1063 skb_get(skb);
1064 } else {
1065 pr_err("Receive queue is full\n");
1066 }
1067 }
1068
1069 /* Remove skbs from the pending queue */
1070 if (llcp_sock->send_ack_n != nr) {
1071 struct sk_buff *s, *tmp;
1072 u8 n;
1073
1074 llcp_sock->send_ack_n = nr;
1075
1076 /* Remove and free all skbs until ns == nr */
1077 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1078 n = nfc_llcp_ns(s);
1079
1080 skb_unlink(s, &llcp_sock->tx_pending_queue);
1081 kfree_skb(s);
1082
1083 if (n == nr)
1084 break;
1085 }
1086
1087 /* Re-queue the remaining skbs for transmission */
1088 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1089 s, tmp) {
1090 skb_unlink(s, &llcp_sock->tx_pending_queue);
1091 skb_queue_head(&local->tx_queue, s);
1092 }
1093 }
1094
1095 if (ptype == LLCP_PDU_RR)
1096 llcp_sock->remote_ready = true;
1097 else if (ptype == LLCP_PDU_RNR)
1098 llcp_sock->remote_ready = false;
1099
1100 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1101 nfc_llcp_send_rr(llcp_sock);
1102
1103 release_sock(sk);
1104 nfc_llcp_sock_put(llcp_sock);
1105}
1106
1107static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1108 const struct sk_buff *skb)
1109{
1110 struct nfc_llcp_sock *llcp_sock;
1111 struct sock *sk;
1112 u8 dsap, ssap;
1113
1114 dsap = nfc_llcp_dsap(skb);
1115 ssap = nfc_llcp_ssap(skb);
1116
1117 if ((dsap == 0) && (ssap == 0)) {
1118 pr_debug("Connection termination");
1119 nfc_dep_link_down(local->dev);
1120 return;
1121 }
1122
1123 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1124 if (llcp_sock == NULL) {
1125 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1126 return;
1127 }
1128
1129 sk = &llcp_sock->sk;
1130 lock_sock(sk);
1131
1132 nfc_llcp_socket_purge(llcp_sock);
1133
1134 if (sk->sk_state == LLCP_CLOSED) {
1135 release_sock(sk);
1136 nfc_llcp_sock_put(llcp_sock);
1137 }
1138
1139 if (sk->sk_state == LLCP_CONNECTED) {
1140 nfc_put_device(local->dev);
1141 sk->sk_state = LLCP_CLOSED;
1142 sk->sk_state_change(sk);
1143 }
1144
1145 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1146
1147 release_sock(sk);
1148 nfc_llcp_sock_put(llcp_sock);
1149}
1150
1151static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1152 const struct sk_buff *skb)
1153{
1154 struct nfc_llcp_sock *llcp_sock;
1155 struct sock *sk;
1156 u8 dsap, ssap;
1157
1158 dsap = nfc_llcp_dsap(skb);
1159 ssap = nfc_llcp_ssap(skb);
1160
1161 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1162 if (llcp_sock == NULL) {
1163 pr_err("Invalid CC\n");
1164 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1165
1166 return;
1167 }
1168
1169 sk = &llcp_sock->sk;
1170
1171 /* Unlink from connecting and link to the client array */
1172 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1173 nfc_llcp_sock_link(&local->sockets, sk);
1174 llcp_sock->dsap = ssap;
1175
1176 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1177 skb->len - LLCP_HEADER_SIZE);
1178
1179 sk->sk_state = LLCP_CONNECTED;
1180 sk->sk_state_change(sk);
1181
1182 nfc_llcp_sock_put(llcp_sock);
1183}
1184
1185static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1186 const struct sk_buff *skb)
1187{
1188 struct nfc_llcp_sock *llcp_sock;
1189 struct sock *sk;
1190 u8 dsap, ssap, reason;
1191
1192 dsap = nfc_llcp_dsap(skb);
1193 ssap = nfc_llcp_ssap(skb);
1194 reason = skb->data[2];
1195
1196 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1197
1198 switch (reason) {
1199 case LLCP_DM_NOBOUND:
1200 case LLCP_DM_REJ:
1201 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1202 break;
1203
1204 default:
1205 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1206 break;
1207 }
1208
1209 if (llcp_sock == NULL) {
1210 pr_debug("Already closed\n");
1211 return;
1212 }
1213
1214 sk = &llcp_sock->sk;
1215
1216 sk->sk_err = ENXIO;
1217 sk->sk_state = LLCP_CLOSED;
1218 sk->sk_state_change(sk);
1219
1220 nfc_llcp_sock_put(llcp_sock);
1221}
1222
1223static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1224 const struct sk_buff *skb)
1225{
1226 struct nfc_llcp_sock *llcp_sock;
1227 u8 dsap, ssap, type, length, tid, sap;
1228 const u8 *tlv;
1229 u16 tlv_len, offset;
1230 const 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
1309add_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
1351exit:
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
1359static 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 skb_put_data(new_skb, skb->data, pdu_len);
1394
1395 nfc_llcp_rx_skb(local, new_skb);
1396
1397 kfree_skb(new_skb);
1398next:
1399 skb_pull(skb, pdu_len);
1400 }
1401}
1402
1403static 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
1466static 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
1489static 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
1496void 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 if (err < 0) {
1501 pr_err("LLCP PDU receive err %d\n", err);
1502 return;
1503 }
1504
1505 __nfc_llcp_recv(local, skb);
1506}
1507
1508int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1509{
1510 struct nfc_llcp_local *local;
1511
1512 local = nfc_llcp_find_local(dev);
1513 if (local == NULL) {
1514 kfree_skb(skb);
1515 return -ENODEV;
1516 }
1517
1518 __nfc_llcp_recv(local, skb);
1519
1520 return 0;
1521}
1522
1523void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1524{
1525 struct nfc_llcp_local *local;
1526
1527 local = nfc_llcp_find_local(dev);
1528 if (local == NULL)
1529 return;
1530
1531 local->remote_miu = LLCP_DEFAULT_MIU;
1532 local->remote_lto = LLCP_DEFAULT_LTO;
1533
1534 /* Close and purge all existing sockets */
1535 nfc_llcp_socket_release(local, true, 0);
1536}
1537
1538void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1539 u8 comm_mode, u8 rf_mode)
1540{
1541 struct nfc_llcp_local *local;
1542
1543 pr_debug("rf mode %d\n", rf_mode);
1544
1545 local = nfc_llcp_find_local(dev);
1546 if (local == NULL)
1547 return;
1548
1549 local->target_idx = target_idx;
1550 local->comm_mode = comm_mode;
1551 local->rf_mode = rf_mode;
1552
1553 if (rf_mode == NFC_RF_INITIATOR) {
1554 pr_debug("Queueing Tx work\n");
1555
1556 schedule_work(&local->tx_work);
1557 } else {
1558 mod_timer(&local->link_timer,
1559 jiffies + msecs_to_jiffies(local->remote_lto));
1560 }
1561}
1562
1563int nfc_llcp_register_device(struct nfc_dev *ndev)
1564{
1565 struct nfc_llcp_local *local;
1566
1567 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1568 if (local == NULL)
1569 return -ENOMEM;
1570
1571 local->dev = ndev;
1572 INIT_LIST_HEAD(&local->list);
1573 kref_init(&local->ref);
1574 mutex_init(&local->sdp_lock);
1575 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1576
1577 skb_queue_head_init(&local->tx_queue);
1578 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1579
1580 local->rx_pending = NULL;
1581 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1582
1583 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1584
1585 rwlock_init(&local->sockets.lock);
1586 rwlock_init(&local->connecting_sockets.lock);
1587 rwlock_init(&local->raw_sockets.lock);
1588
1589 local->lto = 150; /* 1500 ms */
1590 local->rw = LLCP_MAX_RW;
1591 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1592 local->local_wks = 0x1; /* LLC Link Management */
1593
1594 nfc_llcp_build_gb(local);
1595
1596 local->remote_miu = LLCP_DEFAULT_MIU;
1597 local->remote_lto = LLCP_DEFAULT_LTO;
1598
1599 mutex_init(&local->sdreq_lock);
1600 INIT_HLIST_HEAD(&local->pending_sdreqs);
1601 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1602 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1603
1604 list_add(&local->list, &llcp_devices);
1605
1606 return 0;
1607}
1608
1609void nfc_llcp_unregister_device(struct nfc_dev *dev)
1610{
1611 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1612
1613 if (local == NULL) {
1614 pr_debug("No such device\n");
1615 return;
1616 }
1617
1618 local_cleanup(local);
1619
1620 nfc_llcp_local_put(local);
1621}
1622
1623int __init nfc_llcp_init(void)
1624{
1625 return nfc_llcp_sock_init();
1626}
1627
1628void nfc_llcp_exit(void)
1629{
1630 nfc_llcp_sock_exit();
1631}