1/*
2 * Copyright (C) 2011  Intel Corporation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21
22#include <linux/init.h>
23#include <linux/kernel.h>
24#include <linux/list.h>
25#include <linux/nfc.h>
26
27#include "nfc.h"
28#include "llcp.h"
29
30static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31
32static struct list_head llcp_devices;
33
34static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
35
36void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
37{
38	write_lock(&l->lock);
39	sk_add_node(sk, &l->head);
40	write_unlock(&l->lock);
41}
42
43void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
44{
45	write_lock(&l->lock);
46	sk_del_node_init(sk);
47	write_unlock(&l->lock);
48}
49
50void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
51{
52	sock->remote_rw = LLCP_DEFAULT_RW;
53	sock->remote_miu = LLCP_MAX_MIU + 1;
54}
55
56static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
57{
58	struct nfc_llcp_local *local = sock->local;
59	struct sk_buff *s, *tmp;
60
61	pr_debug("%p\n", &sock->sk);
62
63	skb_queue_purge(&sock->tx_queue);
64	skb_queue_purge(&sock->tx_pending_queue);
65
66	if (local == NULL)
67		return;
68
69	/* Search for local pending SKBs that are related to this socket */
70	skb_queue_walk_safe(&local->tx_queue, s, tmp) {
71		if (s->sk != &sock->sk)
72			continue;
73
74		skb_unlink(s, &local->tx_queue);
75		kfree_skb(s);
76	}
77}
78
79static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
80				    int err)
81{
82	struct sock *sk;
83	struct hlist_node *tmp;
84	struct nfc_llcp_sock *llcp_sock;
85
86	skb_queue_purge(&local->tx_queue);
87
88	write_lock(&local->sockets.lock);
89
90	sk_for_each_safe(sk, tmp, &local->sockets.head) {
91		llcp_sock = nfc_llcp_sock(sk);
92
93		bh_lock_sock(sk);
94
95		nfc_llcp_socket_purge(llcp_sock);
96
97		if (sk->sk_state == LLCP_CONNECTED)
98			nfc_put_device(llcp_sock->dev);
99
100		if (sk->sk_state == LLCP_LISTEN) {
101			struct nfc_llcp_sock *lsk, *n;
102			struct sock *accept_sk;
103
104			list_for_each_entry_safe(lsk, n,
105						 &llcp_sock->accept_queue,
106						 accept_queue) {
107				accept_sk = &lsk->sk;
108				bh_lock_sock(accept_sk);
109
110				nfc_llcp_accept_unlink(accept_sk);
111
112				if (err)
113					accept_sk->sk_err = err;
114				accept_sk->sk_state = LLCP_CLOSED;
115				accept_sk->sk_state_change(sk);
116
117				bh_unlock_sock(accept_sk);
118			}
119		}
120
121		if (err)
122			sk->sk_err = err;
123		sk->sk_state = LLCP_CLOSED;
124		sk->sk_state_change(sk);
125
126		bh_unlock_sock(sk);
127
128		sk_del_node_init(sk);
129	}
130
131	write_unlock(&local->sockets.lock);
132
133	/* If we still have a device, we keep the RAW sockets alive */
134	if (device == true)
135		return;
136
137	write_lock(&local->raw_sockets.lock);
138
139	sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
140		llcp_sock = nfc_llcp_sock(sk);
141
142		bh_lock_sock(sk);
143
144		nfc_llcp_socket_purge(llcp_sock);
145
146		if (err)
147			sk->sk_err = err;
148		sk->sk_state = LLCP_CLOSED;
149		sk->sk_state_change(sk);
150
151		bh_unlock_sock(sk);
152
153		sk_del_node_init(sk);
154	}
155
156	write_unlock(&local->raw_sockets.lock);
157}
158
159struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
160{
161	kref_get(&local->ref);
162
163	return local;
164}
165
166static void local_cleanup(struct nfc_llcp_local *local)
167{
168	nfc_llcp_socket_release(local, false, ENXIO);
169	del_timer_sync(&local->link_timer);
170	skb_queue_purge(&local->tx_queue);
171	cancel_work_sync(&local->tx_work);
172	cancel_work_sync(&local->rx_work);
173	cancel_work_sync(&local->timeout_work);
174	kfree_skb(local->rx_pending);
175	del_timer_sync(&local->sdreq_timer);
176	cancel_work_sync(&local->sdreq_timeout_work);
177	nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
178}
179
180static void local_release(struct kref *ref)
181{
182	struct nfc_llcp_local *local;
183
184	local = container_of(ref, struct nfc_llcp_local, ref);
185
186	list_del(&local->list);
187	local_cleanup(local);
188	kfree(local);
189}
190
191int nfc_llcp_local_put(struct nfc_llcp_local *local)
192{
193	if (local == NULL)
194		return 0;
195
196	return kref_put(&local->ref, local_release);
197}
198
199static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
200					       u8 ssap, u8 dsap)
201{
202	struct sock *sk;
203	struct nfc_llcp_sock *llcp_sock, *tmp_sock;
204
205	pr_debug("ssap dsap %d %d\n", ssap, dsap);
206
207	if (ssap == 0 && dsap == 0)
208		return NULL;
209
210	read_lock(&local->sockets.lock);
211
212	llcp_sock = NULL;
213
214	sk_for_each(sk, &local->sockets.head) {
215		tmp_sock = nfc_llcp_sock(sk);
216
217		if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
218			llcp_sock = tmp_sock;
219			break;
220		}
221	}
222
223	read_unlock(&local->sockets.lock);
224
225	if (llcp_sock == NULL)
226		return NULL;
227
228	sock_hold(&llcp_sock->sk);
229
230	return llcp_sock;
231}
232
233static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
234{
235	sock_put(&sock->sk);
236}
237
238static void nfc_llcp_timeout_work(struct work_struct *work)
239{
240	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
241						    timeout_work);
242
243	nfc_dep_link_down(local->dev);
244}
245
246static void nfc_llcp_symm_timer(unsigned long data)
247{
248	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
249
250	pr_err("SYMM timeout\n");
251
252	schedule_work(&local->timeout_work);
253}
254
255static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
256{
257	unsigned long time;
258	HLIST_HEAD(nl_sdres_list);
259	struct hlist_node *n;
260	struct nfc_llcp_sdp_tlv *sdp;
261	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
262						    sdreq_timeout_work);
263
264	mutex_lock(&local->sdreq_lock);
265
266	time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
267
268	hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
269		if (time_after(sdp->time, time))
270			continue;
271
272		sdp->sap = LLCP_SDP_UNBOUND;
273
274		hlist_del(&sdp->node);
275
276		hlist_add_head(&sdp->node, &nl_sdres_list);
277	}
278
279	if (!hlist_empty(&local->pending_sdreqs))
280		mod_timer(&local->sdreq_timer,
281			  jiffies + msecs_to_jiffies(3 * local->remote_lto));
282
283	mutex_unlock(&local->sdreq_lock);
284
285	if (!hlist_empty(&nl_sdres_list))
286		nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
287}
288
289static void nfc_llcp_sdreq_timer(unsigned long data)
290{
291	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
292
293	schedule_work(&local->sdreq_timeout_work);
294}
295
296struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
297{
298	struct nfc_llcp_local *local, *n;
299
300	list_for_each_entry_safe(local, n, &llcp_devices, list)
301		if (local->dev == dev)
302			return local;
303
304	pr_debug("No device found\n");
305
306	return NULL;
307}
308
309static char *wks[] = {
310	NULL,
311	NULL, /* SDP */
312	"urn:nfc:sn:ip",
313	"urn:nfc:sn:obex",
314	"urn:nfc:sn:snep",
315};
316
317static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
318{
319	int sap, num_wks;
320
321	pr_debug("%s\n", service_name);
322
323	if (service_name == NULL)
324		return -EINVAL;
325
326	num_wks = ARRAY_SIZE(wks);
327
328	for (sap = 0; sap < num_wks; sap++) {
329		if (wks[sap] == NULL)
330			continue;
331
332		if (strncmp(wks[sap], service_name, service_name_len) == 0)
333			return sap;
334	}
335
336	return -EINVAL;
337}
338
339static
340struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
341					    u8 *sn, size_t sn_len)
342{
343	struct sock *sk;
344	struct nfc_llcp_sock *llcp_sock, *tmp_sock;
345
346	pr_debug("sn %zd %p\n", sn_len, sn);
347
348	if (sn == NULL || sn_len == 0)
349		return NULL;
350
351	read_lock(&local->sockets.lock);
352
353	llcp_sock = NULL;
354
355	sk_for_each(sk, &local->sockets.head) {
356		tmp_sock = nfc_llcp_sock(sk);
357
358		pr_debug("llcp sock %p\n", tmp_sock);
359
360		if (tmp_sock->sk.sk_type == SOCK_STREAM &&
361		    tmp_sock->sk.sk_state != LLCP_LISTEN)
362			continue;
363
364		if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
365		    tmp_sock->sk.sk_state != LLCP_BOUND)
366			continue;
367
368		if (tmp_sock->service_name == NULL ||
369		    tmp_sock->service_name_len == 0)
370			continue;
371
372		if (tmp_sock->service_name_len != sn_len)
373			continue;
374
375		if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
376			llcp_sock = tmp_sock;
377			break;
378		}
379	}
380
381	read_unlock(&local->sockets.lock);
382
383	pr_debug("Found llcp sock %p\n", llcp_sock);
384
385	return llcp_sock;
386}
387
388u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
389			 struct nfc_llcp_sock *sock)
390{
391	mutex_lock(&local->sdp_lock);
392
393	if (sock->service_name != NULL && sock->service_name_len > 0) {
394		int ssap = nfc_llcp_wks_sap(sock->service_name,
395					    sock->service_name_len);
396
397		if (ssap > 0) {
398			pr_debug("WKS %d\n", ssap);
399
400			/* This is a WKS, let's check if it's free */
401			if (local->local_wks & BIT(ssap)) {
402				mutex_unlock(&local->sdp_lock);
403
404				return LLCP_SAP_MAX;
405			}
406
407			set_bit(ssap, &local->local_wks);
408			mutex_unlock(&local->sdp_lock);
409
410			return ssap;
411		}
412
413		/*
414		 * Check if there already is a non WKS socket bound
415		 * to this service name.
416		 */
417		if (nfc_llcp_sock_from_sn(local, sock->service_name,
418					  sock->service_name_len) != NULL) {
419			mutex_unlock(&local->sdp_lock);
420
421			return LLCP_SAP_MAX;
422		}
423
424		mutex_unlock(&local->sdp_lock);
425
426		return LLCP_SDP_UNBOUND;
427
428	} else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
429		if (!test_bit(sock->ssap, &local->local_wks)) {
430			set_bit(sock->ssap, &local->local_wks);
431			mutex_unlock(&local->sdp_lock);
432
433			return sock->ssap;
434		}
435	}
436
437	mutex_unlock(&local->sdp_lock);
438
439	return LLCP_SAP_MAX;
440}
441
442u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
443{
444	u8 local_ssap;
445
446	mutex_lock(&local->sdp_lock);
447
448	local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
449	if (local_ssap == LLCP_LOCAL_NUM_SAP) {
450		mutex_unlock(&local->sdp_lock);
451		return LLCP_SAP_MAX;
452	}
453
454	set_bit(local_ssap, &local->local_sap);
455
456	mutex_unlock(&local->sdp_lock);
457
458	return local_ssap + LLCP_LOCAL_SAP_OFFSET;
459}
460
461void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
462{
463	u8 local_ssap;
464	unsigned long *sdp;
465
466	if (ssap < LLCP_WKS_NUM_SAP) {
467		local_ssap = ssap;
468		sdp = &local->local_wks;
469	} else if (ssap < LLCP_LOCAL_NUM_SAP) {
470		atomic_t *client_cnt;
471
472		local_ssap = ssap - LLCP_WKS_NUM_SAP;
473		sdp = &local->local_sdp;
474		client_cnt = &local->local_sdp_cnt[local_ssap];
475
476		pr_debug("%d clients\n", atomic_read(client_cnt));
477
478		mutex_lock(&local->sdp_lock);
479
480		if (atomic_dec_and_test(client_cnt)) {
481			struct nfc_llcp_sock *l_sock;
482
483			pr_debug("No more clients for SAP %d\n", ssap);
484
485			clear_bit(local_ssap, sdp);
486
487			/* Find the listening sock and set it back to UNBOUND */
488			l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
489			if (l_sock) {
490				l_sock->ssap = LLCP_SDP_UNBOUND;
491				nfc_llcp_sock_put(l_sock);
492			}
493		}
494
495		mutex_unlock(&local->sdp_lock);
496
497		return;
498	} else if (ssap < LLCP_MAX_SAP) {
499		local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
500		sdp = &local->local_sap;
501	} else {
502		return;
503	}
504
505	mutex_lock(&local->sdp_lock);
506
507	clear_bit(local_ssap, sdp);
508
509	mutex_unlock(&local->sdp_lock);
510}
511
512static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
513{
514	u8 ssap;
515
516	mutex_lock(&local->sdp_lock);
517
518	ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
519	if (ssap == LLCP_SDP_NUM_SAP) {
520		mutex_unlock(&local->sdp_lock);
521
522		return LLCP_SAP_MAX;
523	}
524
525	pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
526
527	set_bit(ssap, &local->local_sdp);
528
529	mutex_unlock(&local->sdp_lock);
530
531	return LLCP_WKS_NUM_SAP + ssap;
532}
533
534static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
535{
536	u8 *gb_cur, *version_tlv, version, version_length;
537	u8 *lto_tlv, lto_length;
538	u8 *wks_tlv, wks_length;
539	u8 *miux_tlv, miux_length;
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 *)&local->local_wks, 2,
553				     &wks_length);
554	gb_len += wks_length;
555
556	miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
557				      &miux_length);
558	gb_len += miux_length;
559
560	gb_len += ARRAY_SIZE(llcp_magic);
561
562	if (gb_len > NFC_MAX_GT_LEN) {
563		ret = -EINVAL;
564		goto out;
565	}
566
567	gb_cur = local->gb;
568
569	memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
570	gb_cur += ARRAY_SIZE(llcp_magic);
571
572	memcpy(gb_cur, version_tlv, version_length);
573	gb_cur += version_length;
574
575	memcpy(gb_cur, lto_tlv, lto_length);
576	gb_cur += lto_length;
577
578	memcpy(gb_cur, wks_tlv, wks_length);
579	gb_cur += wks_length;
580
581	memcpy(gb_cur, miux_tlv, miux_length);
582	gb_cur += miux_length;
583
584	local->gb_len = gb_len;
585
586out:
587	kfree(version_tlv);
588	kfree(lto_tlv);
589	kfree(wks_tlv);
590	kfree(miux_tlv);
591
592	return ret;
593}
594
595u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
596{
597	struct nfc_llcp_local *local;
598
599	local = nfc_llcp_find_local(dev);
600	if (local == NULL) {
601		*general_bytes_len = 0;
602		return NULL;
603	}
604
605	nfc_llcp_build_gb(local);
606
607	*general_bytes_len = local->gb_len;
608
609	return local->gb;
610}
611
612int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
613{
614	struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
615
616	if (local == NULL) {
617		pr_err("No LLCP device\n");
618		return -ENODEV;
619	}
620	if (gb_len < 3)
621		return -EINVAL;
622
623	memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
624	memcpy(local->remote_gb, gb, gb_len);
625	local->remote_gb_len = gb_len;
626
627	if (memcmp(local->remote_gb, llcp_magic, 3)) {
628		pr_err("MAC does not support LLCP\n");
629		return -EINVAL;
630	}
631
632	return nfc_llcp_parse_gb_tlv(local,
633				     &local->remote_gb[3],
634				     local->remote_gb_len - 3);
635}
636
637static u8 nfc_llcp_dsap(struct sk_buff *pdu)
638{
639	return (pdu->data[0] & 0xfc) >> 2;
640}
641
642static u8 nfc_llcp_ptype(struct sk_buff *pdu)
643{
644	return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
645}
646
647static u8 nfc_llcp_ssap(struct sk_buff *pdu)
648{
649	return pdu->data[1] & 0x3f;
650}
651
652static u8 nfc_llcp_ns(struct sk_buff *pdu)
653{
654	return pdu->data[2] >> 4;
655}
656
657static u8 nfc_llcp_nr(struct sk_buff *pdu)
658{
659	return pdu->data[2] & 0xf;
660}
661
662static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
663{
664	pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
665	sock->send_n = (sock->send_n + 1) % 16;
666	sock->recv_ack_n = (sock->recv_n - 1) % 16;
667}
668
669void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
670			       struct sk_buff *skb, u8 direction)
671{
672	struct sk_buff *skb_copy = NULL, *nskb;
673	struct sock *sk;
674	u8 *data;
675
676	read_lock(&local->raw_sockets.lock);
677
678	sk_for_each(sk, &local->raw_sockets.head) {
679		if (sk->sk_state != LLCP_BOUND)
680			continue;
681
682		if (skb_copy == NULL) {
683			skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
684					       GFP_ATOMIC);
685
686			if (skb_copy == NULL)
687				continue;
688
689			data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
690
691			data[0] = local->dev ? local->dev->idx : 0xFF;
692			data[1] = direction;
693		}
694
695		nskb = skb_clone(skb_copy, GFP_ATOMIC);
696		if (!nskb)
697			continue;
698
699		if (sock_queue_rcv_skb(sk, nskb))
700			kfree_skb(nskb);
701	}
702
703	read_unlock(&local->raw_sockets.lock);
704
705	kfree_skb(skb_copy);
706}
707
708static void nfc_llcp_tx_work(struct work_struct *work)
709{
710	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
711						    tx_work);
712	struct sk_buff *skb;
713	struct sock *sk;
714	struct nfc_llcp_sock *llcp_sock;
715
716	skb = skb_dequeue(&local->tx_queue);
717	if (skb != NULL) {
718		sk = skb->sk;
719		llcp_sock = nfc_llcp_sock(sk);
720
721		if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
722			nfc_llcp_send_symm(local->dev);
723		} else {
724			struct sk_buff *copy_skb = NULL;
725			u8 ptype = nfc_llcp_ptype(skb);
726			int ret;
727
728			pr_debug("Sending pending skb\n");
729			print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
730				       DUMP_PREFIX_OFFSET, 16, 1,
731				       skb->data, skb->len, true);
732
733			if (ptype == LLCP_PDU_I)
734				copy_skb = skb_copy(skb, GFP_ATOMIC);
735
736			__net_timestamp(skb);
737
738			nfc_llcp_send_to_raw_sock(local, skb,
739						  NFC_LLCP_DIRECTION_TX);
740
741			ret = nfc_data_exchange(local->dev, local->target_idx,
742						skb, nfc_llcp_recv, local);
743
744			if (ret) {
745				kfree_skb(copy_skb);
746				goto out;
747			}
748
749			if (ptype == LLCP_PDU_I && copy_skb)
750				skb_queue_tail(&llcp_sock->tx_pending_queue,
751					       copy_skb);
752		}
753	} else {
754		nfc_llcp_send_symm(local->dev);
755	}
756
757out:
758	mod_timer(&local->link_timer,
759		  jiffies + msecs_to_jiffies(2 * local->remote_lto));
760}
761
762static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
763							  u8 ssap)
764{
765	struct sock *sk;
766	struct nfc_llcp_sock *llcp_sock;
767
768	read_lock(&local->connecting_sockets.lock);
769
770	sk_for_each(sk, &local->connecting_sockets.head) {
771		llcp_sock = nfc_llcp_sock(sk);
772
773		if (llcp_sock->ssap == ssap) {
774			sock_hold(&llcp_sock->sk);
775			goto out;
776		}
777	}
778
779	llcp_sock = NULL;
780
781out:
782	read_unlock(&local->connecting_sockets.lock);
783
784	return llcp_sock;
785}
786
787static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
788						  u8 *sn, size_t sn_len)
789{
790	struct nfc_llcp_sock *llcp_sock;
791
792	llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
793
794	if (llcp_sock == NULL)
795		return NULL;
796
797	sock_hold(&llcp_sock->sk);
798
799	return llcp_sock;
800}
801
802static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
803{
804	u8 *tlv = &skb->data[2], type, length;
805	size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
806
807	while (offset < tlv_array_len) {
808		type = tlv[0];
809		length = tlv[1];
810
811		pr_debug("type 0x%x length %d\n", type, length);
812
813		if (type == LLCP_TLV_SN) {
814			*sn_len = length;
815			return &tlv[2];
816		}
817
818		offset += length + 2;
819		tlv += length + 2;
820	}
821
822	return NULL;
823}
824
825static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
826			     struct sk_buff *skb)
827{
828	struct nfc_llcp_sock *llcp_sock;
829	struct nfc_llcp_ui_cb *ui_cb;
830	u8 dsap, ssap;
831
832	dsap = nfc_llcp_dsap(skb);
833	ssap = nfc_llcp_ssap(skb);
834
835	ui_cb = nfc_llcp_ui_skb_cb(skb);
836	ui_cb->dsap = dsap;
837	ui_cb->ssap = ssap;
838
839	pr_debug("%d %d\n", dsap, ssap);
840
841	/* We're looking for a bound socket, not a client one */
842	llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
843	if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
844		return;
845
846	/* There is no sequence with UI frames */
847	skb_pull(skb, LLCP_HEADER_SIZE);
848	if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
849		/*
850		 * UI frames will be freed from the socket layer, so we
851		 * need to keep them alive until someone receives them.
852		 */
853		skb_get(skb);
854	} else {
855		pr_err("Receive queue is full\n");
856	}
857
858	nfc_llcp_sock_put(llcp_sock);
859}
860
861static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
862				  struct sk_buff *skb)
863{
864	struct sock *new_sk, *parent;
865	struct nfc_llcp_sock *sock, *new_sock;
866	u8 dsap, ssap, reason;
867
868	dsap = nfc_llcp_dsap(skb);
869	ssap = nfc_llcp_ssap(skb);
870
871	pr_debug("%d %d\n", dsap, ssap);
872
873	if (dsap != LLCP_SAP_SDP) {
874		sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
875		if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
876			reason = LLCP_DM_NOBOUND;
877			goto fail;
878		}
879	} else {
880		u8 *sn;
881		size_t sn_len;
882
883		sn = nfc_llcp_connect_sn(skb, &sn_len);
884		if (sn == NULL) {
885			reason = LLCP_DM_NOBOUND;
886			goto fail;
887		}
888
889		pr_debug("Service name length %zu\n", sn_len);
890
891		sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
892		if (sock == NULL) {
893			reason = LLCP_DM_NOBOUND;
894			goto fail;
895		}
896	}
897
898	lock_sock(&sock->sk);
899
900	parent = &sock->sk;
901
902	if (sk_acceptq_is_full(parent)) {
903		reason = LLCP_DM_REJ;
904		release_sock(&sock->sk);
905		sock_put(&sock->sk);
906		goto fail;
907	}
908
909	if (sock->ssap == LLCP_SDP_UNBOUND) {
910		u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
911
912		pr_debug("First client, reserving %d\n", ssap);
913
914		if (ssap == LLCP_SAP_MAX) {
915			reason = LLCP_DM_REJ;
916			release_sock(&sock->sk);
917			sock_put(&sock->sk);
918			goto fail;
919		}
920
921		sock->ssap = ssap;
922	}
923
924	new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
925	if (new_sk == NULL) {
926		reason = LLCP_DM_REJ;
927		release_sock(&sock->sk);
928		sock_put(&sock->sk);
929		goto fail;
930	}
931
932	new_sock = nfc_llcp_sock(new_sk);
933	new_sock->dev = local->dev;
934	new_sock->local = nfc_llcp_local_get(local);
935	new_sock->rw = sock->rw;
936	new_sock->miux = sock->miux;
937	new_sock->remote_miu = local->remote_miu;
938	new_sock->nfc_protocol = sock->nfc_protocol;
939	new_sock->dsap = ssap;
940	new_sock->target_idx = local->target_idx;
941	new_sock->parent = parent;
942	new_sock->ssap = sock->ssap;
943	if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
944		atomic_t *client_count;
945
946		pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
947
948		client_count =
949			&local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
950
951		atomic_inc(client_count);
952		new_sock->reserved_ssap = sock->ssap;
953	}
954
955	nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
956				      skb->len - LLCP_HEADER_SIZE);
957
958	pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
959
960	nfc_llcp_sock_link(&local->sockets, new_sk);
961
962	nfc_llcp_accept_enqueue(&sock->sk, new_sk);
963
964	nfc_get_device(local->dev->idx);
965
966	new_sk->sk_state = LLCP_CONNECTED;
967
968	/* Wake the listening processes */
969	parent->sk_data_ready(parent, 0);
970
971	/* Send CC */
972	nfc_llcp_send_cc(new_sock);
973
974	release_sock(&sock->sk);
975	sock_put(&sock->sk);
976
977	return;
978
979fail:
980	/* Send DM */
981	nfc_llcp_send_dm(local, dsap, ssap, reason);
982}
983
984int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
985{
986	int nr_frames = 0;
987	struct nfc_llcp_local *local = sock->local;
988
989	pr_debug("Remote ready %d tx queue len %d remote rw %d",
990		 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
991		 sock->remote_rw);
992
993	/* Try to queue some I frames for transmission */
994	while (sock->remote_ready &&
995	       skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
996		struct sk_buff *pdu;
997
998		pdu = skb_dequeue(&sock->tx_queue);
999		if (pdu == NULL)
1000			break;
1001
1002		/* Update N(S)/N(R) */
1003		nfc_llcp_set_nrns(sock, pdu);
1004
1005		skb_queue_tail(&local->tx_queue, pdu);
1006		nr_frames++;
1007	}
1008
1009	return nr_frames;
1010}
1011
1012static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1013			       struct sk_buff *skb)
1014{
1015	struct nfc_llcp_sock *llcp_sock;
1016	struct sock *sk;
1017	u8 dsap, ssap, ptype, ns, nr;
1018
1019	ptype = nfc_llcp_ptype(skb);
1020	dsap = nfc_llcp_dsap(skb);
1021	ssap = nfc_llcp_ssap(skb);
1022	ns = nfc_llcp_ns(skb);
1023	nr = nfc_llcp_nr(skb);
1024
1025	pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1026
1027	llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1028	if (llcp_sock == NULL) {
1029		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1030		return;
1031	}
1032
1033	sk = &llcp_sock->sk;
1034	lock_sock(sk);
1035	if (sk->sk_state == LLCP_CLOSED) {
1036		release_sock(sk);
1037		nfc_llcp_sock_put(llcp_sock);
1038	}
1039
1040	/* Pass the payload upstream */
1041	if (ptype == LLCP_PDU_I) {
1042		pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1043
1044		if (ns == llcp_sock->recv_n)
1045			llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1046		else
1047			pr_err("Received out of sequence I PDU\n");
1048
1049		skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1050		if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1051			/*
1052			 * I frames will be freed from the socket layer, so we
1053			 * need to keep them alive until someone receives them.
1054			 */
1055			skb_get(skb);
1056		} else {
1057			pr_err("Receive queue is full\n");
1058		}
1059	}
1060
1061	/* Remove skbs from the pending queue */
1062	if (llcp_sock->send_ack_n != nr) {
1063		struct sk_buff *s, *tmp;
1064		u8 n;
1065
1066		llcp_sock->send_ack_n = nr;
1067
1068		/* Remove and free all skbs until ns == nr */
1069		skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1070			n = nfc_llcp_ns(s);
1071
1072			skb_unlink(s, &llcp_sock->tx_pending_queue);
1073			kfree_skb(s);
1074
1075			if (n == nr)
1076				break;
1077		}
1078
1079		/* Re-queue the remaining skbs for transmission */
1080		skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1081					    s, tmp) {
1082			skb_unlink(s, &llcp_sock->tx_pending_queue);
1083			skb_queue_head(&local->tx_queue, s);
1084		}
1085	}
1086
1087	if (ptype == LLCP_PDU_RR)
1088		llcp_sock->remote_ready = true;
1089	else if (ptype == LLCP_PDU_RNR)
1090		llcp_sock->remote_ready = false;
1091
1092	if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1093		nfc_llcp_send_rr(llcp_sock);
1094
1095	release_sock(sk);
1096	nfc_llcp_sock_put(llcp_sock);
1097}
1098
1099static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1100			       struct sk_buff *skb)
1101{
1102	struct nfc_llcp_sock *llcp_sock;
1103	struct sock *sk;
1104	u8 dsap, ssap;
1105
1106	dsap = nfc_llcp_dsap(skb);
1107	ssap = nfc_llcp_ssap(skb);
1108
1109	if ((dsap == 0) && (ssap == 0)) {
1110		pr_debug("Connection termination");
1111		nfc_dep_link_down(local->dev);
1112		return;
1113	}
1114
1115	llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1116	if (llcp_sock == NULL) {
1117		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1118		return;
1119	}
1120
1121	sk = &llcp_sock->sk;
1122	lock_sock(sk);
1123
1124	nfc_llcp_socket_purge(llcp_sock);
1125
1126	if (sk->sk_state == LLCP_CLOSED) {
1127		release_sock(sk);
1128		nfc_llcp_sock_put(llcp_sock);
1129	}
1130
1131	if (sk->sk_state == LLCP_CONNECTED) {
1132		nfc_put_device(local->dev);
1133		sk->sk_state = LLCP_CLOSED;
1134		sk->sk_state_change(sk);
1135	}
1136
1137	nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1138
1139	release_sock(sk);
1140	nfc_llcp_sock_put(llcp_sock);
1141}
1142
1143static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1144{
1145	struct nfc_llcp_sock *llcp_sock;
1146	struct sock *sk;
1147	u8 dsap, ssap;
1148
1149	dsap = nfc_llcp_dsap(skb);
1150	ssap = nfc_llcp_ssap(skb);
1151
1152	llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1153	if (llcp_sock == NULL) {
1154		pr_err("Invalid CC\n");
1155		nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1156
1157		return;
1158	}
1159
1160	sk = &llcp_sock->sk;
1161
1162	/* Unlink from connecting and link to the client array */
1163	nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1164	nfc_llcp_sock_link(&local->sockets, sk);
1165	llcp_sock->dsap = ssap;
1166
1167	nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1168				      skb->len - LLCP_HEADER_SIZE);
1169
1170	sk->sk_state = LLCP_CONNECTED;
1171	sk->sk_state_change(sk);
1172
1173	nfc_llcp_sock_put(llcp_sock);
1174}
1175
1176static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1177{
1178	struct nfc_llcp_sock *llcp_sock;
1179	struct sock *sk;
1180	u8 dsap, ssap, reason;
1181
1182	dsap = nfc_llcp_dsap(skb);
1183	ssap = nfc_llcp_ssap(skb);
1184	reason = skb->data[2];
1185
1186	pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1187
1188	switch (reason) {
1189	case LLCP_DM_NOBOUND:
1190	case LLCP_DM_REJ:
1191		llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1192		break;
1193
1194	default:
1195		llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1196		break;
1197	}
1198
1199	if (llcp_sock == NULL) {
1200		pr_debug("Already closed\n");
1201		return;
1202	}
1203
1204	sk = &llcp_sock->sk;
1205
1206	sk->sk_err = ENXIO;
1207	sk->sk_state = LLCP_CLOSED;
1208	sk->sk_state_change(sk);
1209
1210	nfc_llcp_sock_put(llcp_sock);
1211}
1212
1213static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1214			      struct sk_buff *skb)
1215{
1216	struct nfc_llcp_sock *llcp_sock;
1217	u8 dsap, ssap, *tlv, type, length, tid, sap;
1218	u16 tlv_len, offset;
1219	char *service_name;
1220	size_t service_name_len;
1221	struct nfc_llcp_sdp_tlv *sdp;
1222	HLIST_HEAD(llc_sdres_list);
1223	size_t sdres_tlvs_len;
1224	HLIST_HEAD(nl_sdres_list);
1225
1226	dsap = nfc_llcp_dsap(skb);
1227	ssap = nfc_llcp_ssap(skb);
1228
1229	pr_debug("%d %d\n", dsap, ssap);
1230
1231	if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1232		pr_err("Wrong SNL SAP\n");
1233		return;
1234	}
1235
1236	tlv = &skb->data[LLCP_HEADER_SIZE];
1237	tlv_len = skb->len - LLCP_HEADER_SIZE;
1238	offset = 0;
1239	sdres_tlvs_len = 0;
1240
1241	while (offset < tlv_len) {
1242		type = tlv[0];
1243		length = tlv[1];
1244
1245		switch (type) {
1246		case LLCP_TLV_SDREQ:
1247			tid = tlv[2];
1248			service_name = (char *) &tlv[3];
1249			service_name_len = length - 1;
1250
1251			pr_debug("Looking for %.16s\n", service_name);
1252
1253			if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1254			    !strncmp(service_name, "urn:nfc:sn:sdp",
1255				     service_name_len)) {
1256				sap = 1;
1257				goto add_snl;
1258			}
1259
1260			llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1261							  service_name_len);
1262			if (!llcp_sock) {
1263				sap = 0;
1264				goto add_snl;
1265			}
1266
1267			/*
1268			 * We found a socket but its ssap has not been reserved
1269			 * yet. We need to assign it for good and send a reply.
1270			 * The ssap will be freed when the socket is closed.
1271			 */
1272			if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1273				atomic_t *client_count;
1274
1275				sap = nfc_llcp_reserve_sdp_ssap(local);
1276
1277				pr_debug("Reserving %d\n", sap);
1278
1279				if (sap == LLCP_SAP_MAX) {
1280					sap = 0;
1281					goto add_snl;
1282				}
1283
1284				client_count =
1285					&local->local_sdp_cnt[sap -
1286							      LLCP_WKS_NUM_SAP];
1287
1288				atomic_inc(client_count);
1289
1290				llcp_sock->ssap = sap;
1291				llcp_sock->reserved_ssap = sap;
1292			} else {
1293				sap = llcp_sock->ssap;
1294			}
1295
1296			pr_debug("%p %d\n", llcp_sock, sap);
1297
1298add_snl:
1299			sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1300			if (sdp == NULL)
1301				goto exit;
1302
1303			sdres_tlvs_len += sdp->tlv_len;
1304			hlist_add_head(&sdp->node, &llc_sdres_list);
1305			break;
1306
1307		case LLCP_TLV_SDRES:
1308			mutex_lock(&local->sdreq_lock);
1309
1310			pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1311
1312			hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1313				if (sdp->tid != tlv[2])
1314					continue;
1315
1316				sdp->sap = tlv[3];
1317
1318				pr_debug("Found: uri=%s, sap=%d\n",
1319					 sdp->uri, sdp->sap);
1320
1321				hlist_del(&sdp->node);
1322
1323				hlist_add_head(&sdp->node, &nl_sdres_list);
1324
1325				break;
1326			}
1327
1328			mutex_unlock(&local->sdreq_lock);
1329			break;
1330
1331		default:
1332			pr_err("Invalid SNL tlv value 0x%x\n", type);
1333			break;
1334		}
1335
1336		offset += length + 2;
1337		tlv += length + 2;
1338	}
1339
1340exit:
1341	if (!hlist_empty(&nl_sdres_list))
1342		nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1343
1344	if (!hlist_empty(&llc_sdres_list))
1345		nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1346}
1347
1348static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1349{
1350	u8 ptype;
1351	u16 pdu_len;
1352	struct sk_buff *new_skb;
1353
1354	if (skb->len <= LLCP_HEADER_SIZE) {
1355		pr_err("Malformed AGF PDU\n");
1356		return;
1357	}
1358
1359	skb_pull(skb, LLCP_HEADER_SIZE);
1360
1361	while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1362		pdu_len = skb->data[0] << 8 | skb->data[1];
1363
1364		skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1365
1366		if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1367			pr_err("Malformed AGF PDU\n");
1368			return;
1369		}
1370
1371		ptype = nfc_llcp_ptype(skb);
1372
1373		if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1374			goto next;
1375
1376		new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1377		if (new_skb == NULL) {
1378			pr_err("Could not allocate PDU\n");
1379			return;
1380		}
1381
1382		memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1383
1384		nfc_llcp_rx_skb(local, new_skb);
1385
1386		kfree_skb(new_skb);
1387next:
1388		skb_pull(skb, pdu_len);
1389	}
1390}
1391
1392static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1393{
1394	u8 dsap, ssap, ptype;
1395
1396	ptype = nfc_llcp_ptype(skb);
1397	dsap = nfc_llcp_dsap(skb);
1398	ssap = nfc_llcp_ssap(skb);
1399
1400	pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1401
1402	if (ptype != LLCP_PDU_SYMM)
1403		print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1404			       16, 1, skb->data, skb->len, true);
1405
1406	switch (ptype) {
1407	case LLCP_PDU_SYMM:
1408		pr_debug("SYMM\n");
1409		break;
1410
1411	case LLCP_PDU_UI:
1412		pr_debug("UI\n");
1413		nfc_llcp_recv_ui(local, skb);
1414		break;
1415
1416	case LLCP_PDU_CONNECT:
1417		pr_debug("CONNECT\n");
1418		nfc_llcp_recv_connect(local, skb);
1419		break;
1420
1421	case LLCP_PDU_DISC:
1422		pr_debug("DISC\n");
1423		nfc_llcp_recv_disc(local, skb);
1424		break;
1425
1426	case LLCP_PDU_CC:
1427		pr_debug("CC\n");
1428		nfc_llcp_recv_cc(local, skb);
1429		break;
1430
1431	case LLCP_PDU_DM:
1432		pr_debug("DM\n");
1433		nfc_llcp_recv_dm(local, skb);
1434		break;
1435
1436	case LLCP_PDU_SNL:
1437		pr_debug("SNL\n");
1438		nfc_llcp_recv_snl(local, skb);
1439		break;
1440
1441	case LLCP_PDU_I:
1442	case LLCP_PDU_RR:
1443	case LLCP_PDU_RNR:
1444		pr_debug("I frame\n");
1445		nfc_llcp_recv_hdlc(local, skb);
1446		break;
1447
1448	case LLCP_PDU_AGF:
1449		pr_debug("AGF frame\n");
1450		nfc_llcp_recv_agf(local, skb);
1451		break;
1452	}
1453}
1454
1455static void nfc_llcp_rx_work(struct work_struct *work)
1456{
1457	struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1458						    rx_work);
1459	struct sk_buff *skb;
1460
1461	skb = local->rx_pending;
1462	if (skb == NULL) {
1463		pr_debug("No pending SKB\n");
1464		return;
1465	}
1466
1467	__net_timestamp(skb);
1468
1469	nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1470
1471	nfc_llcp_rx_skb(local, skb);
1472
1473	schedule_work(&local->tx_work);
1474	kfree_skb(local->rx_pending);
1475	local->rx_pending = NULL;
1476}
1477
1478static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1479{
1480	local->rx_pending = skb;
1481	del_timer(&local->link_timer);
1482	schedule_work(&local->rx_work);
1483}
1484
1485void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1486{
1487	struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1488
1489	pr_debug("Received an LLCP PDU\n");
1490	if (err < 0) {
1491		pr_err("err %d\n", err);
1492		return;
1493	}
1494
1495	__nfc_llcp_recv(local, skb);
1496}
1497
1498int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1499{
1500	struct nfc_llcp_local *local;
1501
1502	local = nfc_llcp_find_local(dev);
1503	if (local == NULL)
1504		return -ENODEV;
1505
1506	__nfc_llcp_recv(local, skb);
1507
1508	return 0;
1509}
1510
1511void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1512{
1513	struct nfc_llcp_local *local;
1514
1515	local = nfc_llcp_find_local(dev);
1516	if (local == NULL)
1517		return;
1518
1519	local->remote_miu = LLCP_DEFAULT_MIU;
1520	local->remote_lto = LLCP_DEFAULT_LTO;
1521
1522	/* Close and purge all existing sockets */
1523	nfc_llcp_socket_release(local, true, 0);
1524}
1525
1526void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1527			u8 comm_mode, u8 rf_mode)
1528{
1529	struct nfc_llcp_local *local;
1530
1531	pr_debug("rf mode %d\n", rf_mode);
1532
1533	local = nfc_llcp_find_local(dev);
1534	if (local == NULL)
1535		return;
1536
1537	local->target_idx = target_idx;
1538	local->comm_mode = comm_mode;
1539	local->rf_mode = rf_mode;
1540
1541	if (rf_mode == NFC_RF_INITIATOR) {
1542		pr_debug("Queueing Tx work\n");
1543
1544		schedule_work(&local->tx_work);
1545	} else {
1546		mod_timer(&local->link_timer,
1547			  jiffies + msecs_to_jiffies(local->remote_lto));
1548	}
1549}
1550
1551int nfc_llcp_register_device(struct nfc_dev *ndev)
1552{
1553	struct nfc_llcp_local *local;
1554
1555	local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1556	if (local == NULL)
1557		return -ENOMEM;
1558
1559	local->dev = ndev;
1560	INIT_LIST_HEAD(&local->list);
1561	kref_init(&local->ref);
1562	mutex_init(&local->sdp_lock);
1563	init_timer(&local->link_timer);
1564	local->link_timer.data = (unsigned long) local;
1565	local->link_timer.function = nfc_llcp_symm_timer;
1566
1567	skb_queue_head_init(&local->tx_queue);
1568	INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1569
1570	local->rx_pending = NULL;
1571	INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1572
1573	INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1574
1575	rwlock_init(&local->sockets.lock);
1576	rwlock_init(&local->connecting_sockets.lock);
1577	rwlock_init(&local->raw_sockets.lock);
1578
1579	local->lto = 150; /* 1500 ms */
1580	local->rw = LLCP_MAX_RW;
1581	local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1582
1583	nfc_llcp_build_gb(local);
1584
1585	local->remote_miu = LLCP_DEFAULT_MIU;
1586	local->remote_lto = LLCP_DEFAULT_LTO;
1587
1588	mutex_init(&local->sdreq_lock);
1589	INIT_HLIST_HEAD(&local->pending_sdreqs);
1590	init_timer(&local->sdreq_timer);
1591	local->sdreq_timer.data = (unsigned long) local;
1592	local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1593	INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1594
1595	list_add(&local->list, &llcp_devices);
1596
1597	return 0;
1598}
1599
1600void nfc_llcp_unregister_device(struct nfc_dev *dev)
1601{
1602	struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1603
1604	if (local == NULL) {
1605		pr_debug("No such device\n");
1606		return;
1607	}
1608
1609	local_cleanup(local);
1610
1611	nfc_llcp_local_put(local);
1612}
1613
1614int __init nfc_llcp_init(void)
1615{
1616	INIT_LIST_HEAD(&llcp_devices);
1617
1618	return nfc_llcp_sock_init();
1619}
1620
1621void nfc_llcp_exit(void)
1622{
1623	nfc_llcp_sock_exit();
1624}
1625