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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
29static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
30
31static LIST_HEAD(llcp_devices);
32
33static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
34
35void 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
42void 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
49void 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
55static 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
78static 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
158struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
159{
160 kref_get(&local->ref);
161
162 return local;
163}
164
165static 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
179static 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
190int 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
198static 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
232static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
233{
234 sock_put(&sock->sk);
235}
236
237static 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
245static 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
254static 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
288static 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
295struct 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
308static char *wks[] = {
309 NULL,
310 NULL, /* SDP */
311 "urn:nfc:sn:ip",
312 "urn:nfc:sn:obex",
313 "urn:nfc:sn:snep",
314};
315
316static 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
338static
339struct 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
387u8 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
441u8 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
460void 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
511static 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
533static 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
585out:
586 kfree(version_tlv);
587 kfree(lto_tlv);
588 kfree(wks_tlv);
589 kfree(miux_tlv);
590
591 return ret;
592}
593
594u8 *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
611int 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
638static u8 nfc_llcp_dsap(struct sk_buff *pdu)
639{
640 return (pdu->data[0] & 0xfc) >> 2;
641}
642
643static u8 nfc_llcp_ptype(struct sk_buff *pdu)
644{
645 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
646}
647
648static u8 nfc_llcp_ssap(struct sk_buff *pdu)
649{
650 return pdu->data[1] & 0x3f;
651}
652
653static u8 nfc_llcp_ns(struct sk_buff *pdu)
654{
655 return pdu->data[2] >> 4;
656}
657
658static u8 nfc_llcp_nr(struct sk_buff *pdu)
659{
660 return pdu->data[2] & 0xf;
661}
662
663static 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
670void 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
710static 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
769out:
770 mod_timer(&local->link_timer,
771 jiffies + msecs_to_jiffies(2 * local->remote_lto));
772}
773
774static 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
793out:
794 read_unlock(&local->connecting_sockets.lock);
795
796 return llcp_sock;
797}
798
799static 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
814static 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
837static 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
873static 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
990fail:
991 /* Send DM */
992 nfc_llcp_send_dm(local, dsap, ssap, reason);
993}
994
995int 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
1023static 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
1110static 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
1154static 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
1187static 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
1224static 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
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 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);
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 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
1509int 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
1524void 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
1539void 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
1564int 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
1614void 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
1628int __init nfc_llcp_init(void)
1629{
1630 return nfc_llcp_sock_init();
1631}
1632
1633void nfc_llcp_exit(void)
1634{
1635 nfc_llcp_sock_exit();
1636}
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/* Protects llcp_devices list */
21static DEFINE_SPINLOCK(llcp_devices_lock);
22
23static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
24
25void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
26{
27 write_lock(&l->lock);
28 sk_add_node(sk, &l->head);
29 write_unlock(&l->lock);
30}
31
32void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
33{
34 write_lock(&l->lock);
35 sk_del_node_init(sk);
36 write_unlock(&l->lock);
37}
38
39void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
40{
41 sock->remote_rw = LLCP_DEFAULT_RW;
42 sock->remote_miu = LLCP_MAX_MIU + 1;
43}
44
45static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
46{
47 struct nfc_llcp_local *local = sock->local;
48 struct sk_buff *s, *tmp;
49
50 skb_queue_purge(&sock->tx_queue);
51 skb_queue_purge(&sock->tx_pending_queue);
52
53 if (local == NULL)
54 return;
55
56 /* Search for local pending SKBs that are related to this socket */
57 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
58 if (s->sk != &sock->sk)
59 continue;
60
61 skb_unlink(s, &local->tx_queue);
62 kfree_skb(s);
63 }
64}
65
66static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
67 int err)
68{
69 struct sock *sk;
70 struct hlist_node *tmp;
71 struct nfc_llcp_sock *llcp_sock;
72
73 skb_queue_purge(&local->tx_queue);
74
75 write_lock(&local->sockets.lock);
76
77 sk_for_each_safe(sk, tmp, &local->sockets.head) {
78 llcp_sock = nfc_llcp_sock(sk);
79
80 bh_lock_sock(sk);
81
82 nfc_llcp_socket_purge(llcp_sock);
83
84 if (sk->sk_state == LLCP_CONNECTED)
85 nfc_put_device(llcp_sock->dev);
86
87 if (sk->sk_state == LLCP_LISTEN) {
88 struct nfc_llcp_sock *lsk, *n;
89 struct sock *accept_sk;
90
91 list_for_each_entry_safe(lsk, n,
92 &llcp_sock->accept_queue,
93 accept_queue) {
94 accept_sk = &lsk->sk;
95 bh_lock_sock(accept_sk);
96
97 nfc_llcp_accept_unlink(accept_sk);
98
99 if (err)
100 accept_sk->sk_err = err;
101 accept_sk->sk_state = LLCP_CLOSED;
102 accept_sk->sk_state_change(sk);
103
104 bh_unlock_sock(accept_sk);
105 }
106 }
107
108 if (err)
109 sk->sk_err = err;
110 sk->sk_state = LLCP_CLOSED;
111 sk->sk_state_change(sk);
112
113 bh_unlock_sock(sk);
114
115 sk_del_node_init(sk);
116 }
117
118 write_unlock(&local->sockets.lock);
119
120 /* If we still have a device, we keep the RAW sockets alive */
121 if (device == true)
122 return;
123
124 write_lock(&local->raw_sockets.lock);
125
126 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
127 llcp_sock = nfc_llcp_sock(sk);
128
129 bh_lock_sock(sk);
130
131 nfc_llcp_socket_purge(llcp_sock);
132
133 if (err)
134 sk->sk_err = err;
135 sk->sk_state = LLCP_CLOSED;
136 sk->sk_state_change(sk);
137
138 bh_unlock_sock(sk);
139
140 sk_del_node_init(sk);
141 }
142
143 write_unlock(&local->raw_sockets.lock);
144}
145
146static struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
147{
148 /* Since using nfc_llcp_local may result in usage of nfc_dev, whenever
149 * we hold a reference to local, we also need to hold a reference to
150 * the device to avoid UAF.
151 */
152 if (!nfc_get_device(local->dev->idx))
153 return NULL;
154
155 kref_get(&local->ref);
156
157 return local;
158}
159
160static void local_cleanup(struct nfc_llcp_local *local)
161{
162 nfc_llcp_socket_release(local, false, ENXIO);
163 del_timer_sync(&local->link_timer);
164 skb_queue_purge(&local->tx_queue);
165 cancel_work_sync(&local->tx_work);
166 cancel_work_sync(&local->rx_work);
167 cancel_work_sync(&local->timeout_work);
168 kfree_skb(local->rx_pending);
169 local->rx_pending = NULL;
170 del_timer_sync(&local->sdreq_timer);
171 cancel_work_sync(&local->sdreq_timeout_work);
172 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
173}
174
175static void local_release(struct kref *ref)
176{
177 struct nfc_llcp_local *local;
178
179 local = container_of(ref, struct nfc_llcp_local, ref);
180
181 local_cleanup(local);
182 kfree(local);
183}
184
185int nfc_llcp_local_put(struct nfc_llcp_local *local)
186{
187 struct nfc_dev *dev;
188 int ret;
189
190 if (local == NULL)
191 return 0;
192
193 dev = local->dev;
194
195 ret = kref_put(&local->ref, local_release);
196 nfc_put_device(dev);
197
198 return ret;
199}
200
201static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
202 u8 ssap, u8 dsap)
203{
204 struct sock *sk;
205 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
206
207 pr_debug("ssap dsap %d %d\n", ssap, dsap);
208
209 if (ssap == 0 && dsap == 0)
210 return NULL;
211
212 read_lock(&local->sockets.lock);
213
214 llcp_sock = NULL;
215
216 sk_for_each(sk, &local->sockets.head) {
217 tmp_sock = nfc_llcp_sock(sk);
218
219 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
220 llcp_sock = tmp_sock;
221 sock_hold(&llcp_sock->sk);
222 break;
223 }
224 }
225
226 read_unlock(&local->sockets.lock);
227
228 return llcp_sock;
229}
230
231static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
232{
233 sock_put(&sock->sk);
234}
235
236static void nfc_llcp_timeout_work(struct work_struct *work)
237{
238 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
239 timeout_work);
240
241 nfc_dep_link_down(local->dev);
242}
243
244static void nfc_llcp_symm_timer(struct timer_list *t)
245{
246 struct nfc_llcp_local *local = from_timer(local, t, link_timer);
247
248 pr_err("SYMM timeout\n");
249
250 schedule_work(&local->timeout_work);
251}
252
253static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
254{
255 unsigned long time;
256 HLIST_HEAD(nl_sdres_list);
257 struct hlist_node *n;
258 struct nfc_llcp_sdp_tlv *sdp;
259 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
260 sdreq_timeout_work);
261
262 mutex_lock(&local->sdreq_lock);
263
264 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
265
266 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
267 if (time_after(sdp->time, time))
268 continue;
269
270 sdp->sap = LLCP_SDP_UNBOUND;
271
272 hlist_del(&sdp->node);
273
274 hlist_add_head(&sdp->node, &nl_sdres_list);
275 }
276
277 if (!hlist_empty(&local->pending_sdreqs))
278 mod_timer(&local->sdreq_timer,
279 jiffies + msecs_to_jiffies(3 * local->remote_lto));
280
281 mutex_unlock(&local->sdreq_lock);
282
283 if (!hlist_empty(&nl_sdres_list))
284 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
285}
286
287static void nfc_llcp_sdreq_timer(struct timer_list *t)
288{
289 struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
290
291 schedule_work(&local->sdreq_timeout_work);
292}
293
294struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
295{
296 struct nfc_llcp_local *local;
297 struct nfc_llcp_local *res = NULL;
298
299 spin_lock(&llcp_devices_lock);
300 list_for_each_entry(local, &llcp_devices, list)
301 if (local->dev == dev) {
302 res = nfc_llcp_local_get(local);
303 break;
304 }
305 spin_unlock(&llcp_devices_lock);
306
307 return res;
308}
309
310static struct nfc_llcp_local *nfc_llcp_remove_local(struct nfc_dev *dev)
311{
312 struct nfc_llcp_local *local, *tmp;
313
314 spin_lock(&llcp_devices_lock);
315 list_for_each_entry_safe(local, tmp, &llcp_devices, list)
316 if (local->dev == dev) {
317 list_del(&local->list);
318 spin_unlock(&llcp_devices_lock);
319 return local;
320 }
321 spin_unlock(&llcp_devices_lock);
322
323 pr_warn("Shutting down device not found\n");
324
325 return NULL;
326}
327
328static char *wks[] = {
329 NULL,
330 NULL, /* SDP */
331 "urn:nfc:sn:ip",
332 "urn:nfc:sn:obex",
333 "urn:nfc:sn:snep",
334};
335
336static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
337{
338 int sap, num_wks;
339
340 pr_debug("%s\n", service_name);
341
342 if (service_name == NULL)
343 return -EINVAL;
344
345 num_wks = ARRAY_SIZE(wks);
346
347 for (sap = 0; sap < num_wks; sap++) {
348 if (wks[sap] == NULL)
349 continue;
350
351 if (strncmp(wks[sap], service_name, service_name_len) == 0)
352 return sap;
353 }
354
355 return -EINVAL;
356}
357
358static
359struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
360 const u8 *sn, size_t sn_len,
361 bool needref)
362{
363 struct sock *sk;
364 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
365
366 pr_debug("sn %zd %p\n", sn_len, sn);
367
368 if (sn == NULL || sn_len == 0)
369 return NULL;
370
371 read_lock(&local->sockets.lock);
372
373 llcp_sock = NULL;
374
375 sk_for_each(sk, &local->sockets.head) {
376 tmp_sock = nfc_llcp_sock(sk);
377
378 pr_debug("llcp sock %p\n", tmp_sock);
379
380 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
381 tmp_sock->sk.sk_state != LLCP_LISTEN)
382 continue;
383
384 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
385 tmp_sock->sk.sk_state != LLCP_BOUND)
386 continue;
387
388 if (tmp_sock->service_name == NULL ||
389 tmp_sock->service_name_len == 0)
390 continue;
391
392 if (tmp_sock->service_name_len != sn_len)
393 continue;
394
395 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
396 llcp_sock = tmp_sock;
397 if (needref)
398 sock_hold(&llcp_sock->sk);
399 break;
400 }
401 }
402
403 read_unlock(&local->sockets.lock);
404
405 pr_debug("Found llcp sock %p\n", llcp_sock);
406
407 return llcp_sock;
408}
409
410u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
411 struct nfc_llcp_sock *sock)
412{
413 mutex_lock(&local->sdp_lock);
414
415 if (sock->service_name != NULL && sock->service_name_len > 0) {
416 int ssap = nfc_llcp_wks_sap(sock->service_name,
417 sock->service_name_len);
418
419 if (ssap > 0) {
420 pr_debug("WKS %d\n", ssap);
421
422 /* This is a WKS, let's check if it's free */
423 if (test_bit(ssap, &local->local_wks)) {
424 mutex_unlock(&local->sdp_lock);
425
426 return LLCP_SAP_MAX;
427 }
428
429 set_bit(ssap, &local->local_wks);
430 mutex_unlock(&local->sdp_lock);
431
432 return ssap;
433 }
434
435 /*
436 * Check if there already is a non WKS socket bound
437 * to this service name.
438 */
439 if (nfc_llcp_sock_from_sn(local, sock->service_name,
440 sock->service_name_len,
441 false) != NULL) {
442 mutex_unlock(&local->sdp_lock);
443
444 return LLCP_SAP_MAX;
445 }
446
447 mutex_unlock(&local->sdp_lock);
448
449 return LLCP_SDP_UNBOUND;
450
451 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
452 if (!test_bit(sock->ssap, &local->local_wks)) {
453 set_bit(sock->ssap, &local->local_wks);
454 mutex_unlock(&local->sdp_lock);
455
456 return sock->ssap;
457 }
458 }
459
460 mutex_unlock(&local->sdp_lock);
461
462 return LLCP_SAP_MAX;
463}
464
465u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
466{
467 u8 local_ssap;
468
469 mutex_lock(&local->sdp_lock);
470
471 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
472 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
473 mutex_unlock(&local->sdp_lock);
474 return LLCP_SAP_MAX;
475 }
476
477 set_bit(local_ssap, &local->local_sap);
478
479 mutex_unlock(&local->sdp_lock);
480
481 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
482}
483
484void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
485{
486 u8 local_ssap;
487 unsigned long *sdp;
488
489 if (ssap < LLCP_WKS_NUM_SAP) {
490 local_ssap = ssap;
491 sdp = &local->local_wks;
492 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
493 atomic_t *client_cnt;
494
495 local_ssap = ssap - LLCP_WKS_NUM_SAP;
496 sdp = &local->local_sdp;
497 client_cnt = &local->local_sdp_cnt[local_ssap];
498
499 pr_debug("%d clients\n", atomic_read(client_cnt));
500
501 mutex_lock(&local->sdp_lock);
502
503 if (atomic_dec_and_test(client_cnt)) {
504 struct nfc_llcp_sock *l_sock;
505
506 pr_debug("No more clients for SAP %d\n", ssap);
507
508 clear_bit(local_ssap, sdp);
509
510 /* Find the listening sock and set it back to UNBOUND */
511 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
512 if (l_sock) {
513 l_sock->ssap = LLCP_SDP_UNBOUND;
514 nfc_llcp_sock_put(l_sock);
515 }
516 }
517
518 mutex_unlock(&local->sdp_lock);
519
520 return;
521 } else if (ssap < LLCP_MAX_SAP) {
522 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
523 sdp = &local->local_sap;
524 } else {
525 return;
526 }
527
528 mutex_lock(&local->sdp_lock);
529
530 clear_bit(local_ssap, sdp);
531
532 mutex_unlock(&local->sdp_lock);
533}
534
535static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
536{
537 u8 ssap;
538
539 mutex_lock(&local->sdp_lock);
540
541 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
542 if (ssap == LLCP_SDP_NUM_SAP) {
543 mutex_unlock(&local->sdp_lock);
544
545 return LLCP_SAP_MAX;
546 }
547
548 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
549
550 set_bit(ssap, &local->local_sdp);
551
552 mutex_unlock(&local->sdp_lock);
553
554 return LLCP_WKS_NUM_SAP + ssap;
555}
556
557static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
558{
559 u8 *gb_cur, version, version_length;
560 u8 lto_length, wks_length, miux_length;
561 const u8 *version_tlv = NULL, *lto_tlv = NULL,
562 *wks_tlv = NULL, *miux_tlv = NULL;
563 __be16 wks = cpu_to_be16(local->local_wks);
564 u8 gb_len = 0;
565 int ret = 0;
566
567 version = LLCP_VERSION_11;
568 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
569 1, &version_length);
570 if (!version_tlv) {
571 ret = -ENOMEM;
572 goto out;
573 }
574 gb_len += version_length;
575
576 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length);
577 if (!lto_tlv) {
578 ret = -ENOMEM;
579 goto out;
580 }
581 gb_len += lto_length;
582
583 pr_debug("Local wks 0x%lx\n", local->local_wks);
584 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
585 if (!wks_tlv) {
586 ret = -ENOMEM;
587 goto out;
588 }
589 gb_len += wks_length;
590
591 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
592 &miux_length);
593 if (!miux_tlv) {
594 ret = -ENOMEM;
595 goto out;
596 }
597 gb_len += miux_length;
598
599 gb_len += ARRAY_SIZE(llcp_magic);
600
601 if (gb_len > NFC_MAX_GT_LEN) {
602 ret = -EINVAL;
603 goto out;
604 }
605
606 gb_cur = local->gb;
607
608 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
609 gb_cur += ARRAY_SIZE(llcp_magic);
610
611 memcpy(gb_cur, version_tlv, version_length);
612 gb_cur += version_length;
613
614 memcpy(gb_cur, lto_tlv, lto_length);
615 gb_cur += lto_length;
616
617 memcpy(gb_cur, wks_tlv, wks_length);
618 gb_cur += wks_length;
619
620 memcpy(gb_cur, miux_tlv, miux_length);
621 gb_cur += miux_length;
622
623 local->gb_len = gb_len;
624
625out:
626 kfree(version_tlv);
627 kfree(lto_tlv);
628 kfree(wks_tlv);
629 kfree(miux_tlv);
630
631 return ret;
632}
633
634u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
635{
636 struct nfc_llcp_local *local;
637
638 local = nfc_llcp_find_local(dev);
639 if (local == NULL) {
640 *general_bytes_len = 0;
641 return NULL;
642 }
643
644 nfc_llcp_build_gb(local);
645
646 *general_bytes_len = local->gb_len;
647
648 nfc_llcp_local_put(local);
649
650 return local->gb;
651}
652
653int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
654{
655 struct nfc_llcp_local *local;
656 int err;
657
658 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
659 return -EINVAL;
660
661 local = nfc_llcp_find_local(dev);
662 if (local == NULL) {
663 pr_err("No LLCP device\n");
664 return -ENODEV;
665 }
666
667 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
668 memcpy(local->remote_gb, gb, gb_len);
669 local->remote_gb_len = gb_len;
670
671 if (memcmp(local->remote_gb, llcp_magic, 3)) {
672 pr_err("MAC does not support LLCP\n");
673 err = -EINVAL;
674 goto out;
675 }
676
677 err = nfc_llcp_parse_gb_tlv(local,
678 &local->remote_gb[3],
679 local->remote_gb_len - 3);
680out:
681 nfc_llcp_local_put(local);
682 return err;
683}
684
685static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
686{
687 return (pdu->data[0] & 0xfc) >> 2;
688}
689
690static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
691{
692 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
693}
694
695static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
696{
697 return pdu->data[1] & 0x3f;
698}
699
700static u8 nfc_llcp_ns(const struct sk_buff *pdu)
701{
702 return pdu->data[2] >> 4;
703}
704
705static u8 nfc_llcp_nr(const struct sk_buff *pdu)
706{
707 return pdu->data[2] & 0xf;
708}
709
710static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
711{
712 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
713 sock->send_n = (sock->send_n + 1) % 16;
714 sock->recv_ack_n = (sock->recv_n - 1) % 16;
715}
716
717void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
718 struct sk_buff *skb, u8 direction)
719{
720 struct sk_buff *skb_copy = NULL, *nskb;
721 struct sock *sk;
722 u8 *data;
723
724 read_lock(&local->raw_sockets.lock);
725
726 sk_for_each(sk, &local->raw_sockets.head) {
727 if (sk->sk_state != LLCP_BOUND)
728 continue;
729
730 if (skb_copy == NULL) {
731 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
732 GFP_ATOMIC, true);
733
734 if (skb_copy == NULL)
735 continue;
736
737 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
738
739 data[0] = local->dev ? local->dev->idx : 0xFF;
740 data[1] = direction & 0x01;
741 data[1] |= (RAW_PAYLOAD_LLCP << 1);
742 }
743
744 nskb = skb_clone(skb_copy, GFP_ATOMIC);
745 if (!nskb)
746 continue;
747
748 if (sock_queue_rcv_skb(sk, nskb))
749 kfree_skb(nskb);
750 }
751
752 read_unlock(&local->raw_sockets.lock);
753
754 kfree_skb(skb_copy);
755}
756
757static void nfc_llcp_tx_work(struct work_struct *work)
758{
759 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
760 tx_work);
761 struct sk_buff *skb;
762 struct sock *sk;
763 struct nfc_llcp_sock *llcp_sock;
764
765 skb = skb_dequeue(&local->tx_queue);
766 if (skb != NULL) {
767 sk = skb->sk;
768 llcp_sock = nfc_llcp_sock(sk);
769
770 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
771 kfree_skb(skb);
772 nfc_llcp_send_symm(local->dev);
773 } else if (llcp_sock && !llcp_sock->remote_ready) {
774 skb_queue_head(&local->tx_queue, skb);
775 nfc_llcp_send_symm(local->dev);
776 } else {
777 struct sk_buff *copy_skb = NULL;
778 u8 ptype = nfc_llcp_ptype(skb);
779 int ret;
780
781 pr_debug("Sending pending skb\n");
782 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
783 16, 1, skb->data, skb->len, true);
784
785 if (ptype == LLCP_PDU_I)
786 copy_skb = skb_copy(skb, GFP_ATOMIC);
787
788 __net_timestamp(skb);
789
790 nfc_llcp_send_to_raw_sock(local, skb,
791 NFC_DIRECTION_TX);
792
793 ret = nfc_data_exchange(local->dev, local->target_idx,
794 skb, nfc_llcp_recv, local);
795
796 if (ret) {
797 kfree_skb(copy_skb);
798 goto out;
799 }
800
801 if (ptype == LLCP_PDU_I && copy_skb)
802 skb_queue_tail(&llcp_sock->tx_pending_queue,
803 copy_skb);
804 }
805 } else {
806 nfc_llcp_send_symm(local->dev);
807 }
808
809out:
810 mod_timer(&local->link_timer,
811 jiffies + msecs_to_jiffies(2 * local->remote_lto));
812}
813
814static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
815 u8 ssap)
816{
817 struct sock *sk;
818 struct nfc_llcp_sock *llcp_sock;
819
820 read_lock(&local->connecting_sockets.lock);
821
822 sk_for_each(sk, &local->connecting_sockets.head) {
823 llcp_sock = nfc_llcp_sock(sk);
824
825 if (llcp_sock->ssap == ssap) {
826 sock_hold(&llcp_sock->sk);
827 goto out;
828 }
829 }
830
831 llcp_sock = NULL;
832
833out:
834 read_unlock(&local->connecting_sockets.lock);
835
836 return llcp_sock;
837}
838
839static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
840 const u8 *sn, size_t sn_len)
841{
842 return nfc_llcp_sock_from_sn(local, sn, sn_len, true);
843}
844
845static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
846{
847 u8 type, length;
848 const u8 *tlv = &skb->data[2];
849 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
850
851 while (offset < tlv_array_len) {
852 type = tlv[0];
853 length = tlv[1];
854
855 pr_debug("type 0x%x length %d\n", type, length);
856
857 if (type == LLCP_TLV_SN) {
858 *sn_len = length;
859 return &tlv[2];
860 }
861
862 offset += length + 2;
863 tlv += length + 2;
864 }
865
866 return NULL;
867}
868
869static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
870 struct sk_buff *skb)
871{
872 struct nfc_llcp_sock *llcp_sock;
873 struct nfc_llcp_ui_cb *ui_cb;
874 u8 dsap, ssap;
875
876 dsap = nfc_llcp_dsap(skb);
877 ssap = nfc_llcp_ssap(skb);
878
879 ui_cb = nfc_llcp_ui_skb_cb(skb);
880 ui_cb->dsap = dsap;
881 ui_cb->ssap = ssap;
882
883 pr_debug("%d %d\n", dsap, ssap);
884
885 /* We're looking for a bound socket, not a client one */
886 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
887 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
888 return;
889
890 /* There is no sequence with UI frames */
891 skb_pull(skb, LLCP_HEADER_SIZE);
892 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
893 /*
894 * UI frames will be freed from the socket layer, so we
895 * need to keep them alive until someone receives them.
896 */
897 skb_get(skb);
898 } else {
899 pr_err("Receive queue is full\n");
900 }
901
902 nfc_llcp_sock_put(llcp_sock);
903}
904
905static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
906 const struct sk_buff *skb)
907{
908 struct sock *new_sk, *parent;
909 struct nfc_llcp_sock *sock, *new_sock;
910 u8 dsap, ssap, reason;
911
912 dsap = nfc_llcp_dsap(skb);
913 ssap = nfc_llcp_ssap(skb);
914
915 pr_debug("%d %d\n", dsap, ssap);
916
917 if (dsap != LLCP_SAP_SDP) {
918 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
919 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
920 reason = LLCP_DM_NOBOUND;
921 goto fail;
922 }
923 } else {
924 const u8 *sn;
925 size_t sn_len;
926
927 sn = nfc_llcp_connect_sn(skb, &sn_len);
928 if (sn == NULL) {
929 reason = LLCP_DM_NOBOUND;
930 goto fail;
931 }
932
933 pr_debug("Service name length %zu\n", sn_len);
934
935 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
936 if (sock == NULL) {
937 reason = LLCP_DM_NOBOUND;
938 goto fail;
939 }
940 }
941
942 lock_sock(&sock->sk);
943
944 parent = &sock->sk;
945
946 if (sk_acceptq_is_full(parent)) {
947 reason = LLCP_DM_REJ;
948 release_sock(&sock->sk);
949 sock_put(&sock->sk);
950 goto fail;
951 }
952
953 if (sock->ssap == LLCP_SDP_UNBOUND) {
954 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
955
956 pr_debug("First client, reserving %d\n", ssap);
957
958 if (ssap == LLCP_SAP_MAX) {
959 reason = LLCP_DM_REJ;
960 release_sock(&sock->sk);
961 sock_put(&sock->sk);
962 goto fail;
963 }
964
965 sock->ssap = ssap;
966 }
967
968 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
969 if (new_sk == NULL) {
970 reason = LLCP_DM_REJ;
971 release_sock(&sock->sk);
972 sock_put(&sock->sk);
973 goto fail;
974 }
975
976 new_sock = nfc_llcp_sock(new_sk);
977
978 new_sock->local = nfc_llcp_local_get(local);
979 if (!new_sock->local) {
980 reason = LLCP_DM_REJ;
981 sock_put(&new_sock->sk);
982 release_sock(&sock->sk);
983 sock_put(&sock->sk);
984 goto fail;
985 }
986
987 new_sock->dev = local->dev;
988 new_sock->rw = sock->rw;
989 new_sock->miux = sock->miux;
990 new_sock->nfc_protocol = sock->nfc_protocol;
991 new_sock->dsap = ssap;
992 new_sock->target_idx = local->target_idx;
993 new_sock->parent = parent;
994 new_sock->ssap = sock->ssap;
995 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
996 atomic_t *client_count;
997
998 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
999
1000 client_count =
1001 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
1002
1003 atomic_inc(client_count);
1004 new_sock->reserved_ssap = sock->ssap;
1005 }
1006
1007 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
1008 skb->len - LLCP_HEADER_SIZE);
1009
1010 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
1011
1012 nfc_llcp_sock_link(&local->sockets, new_sk);
1013
1014 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
1015
1016 nfc_get_device(local->dev->idx);
1017
1018 new_sk->sk_state = LLCP_CONNECTED;
1019
1020 /* Wake the listening processes */
1021 parent->sk_data_ready(parent);
1022
1023 /* Send CC */
1024 nfc_llcp_send_cc(new_sock);
1025
1026 release_sock(&sock->sk);
1027 sock_put(&sock->sk);
1028
1029 return;
1030
1031fail:
1032 /* Send DM */
1033 nfc_llcp_send_dm(local, dsap, ssap, reason);
1034}
1035
1036int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
1037{
1038 int nr_frames = 0;
1039 struct nfc_llcp_local *local = sock->local;
1040
1041 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1042 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1043 sock->remote_rw);
1044
1045 /* Try to queue some I frames for transmission */
1046 while (sock->remote_ready &&
1047 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1048 struct sk_buff *pdu;
1049
1050 pdu = skb_dequeue(&sock->tx_queue);
1051 if (pdu == NULL)
1052 break;
1053
1054 /* Update N(S)/N(R) */
1055 nfc_llcp_set_nrns(sock, pdu);
1056
1057 skb_queue_tail(&local->tx_queue, pdu);
1058 nr_frames++;
1059 }
1060
1061 return nr_frames;
1062}
1063
1064static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1065 struct sk_buff *skb)
1066{
1067 struct nfc_llcp_sock *llcp_sock;
1068 struct sock *sk;
1069 u8 dsap, ssap, ptype, ns, nr;
1070
1071 ptype = nfc_llcp_ptype(skb);
1072 dsap = nfc_llcp_dsap(skb);
1073 ssap = nfc_llcp_ssap(skb);
1074 ns = nfc_llcp_ns(skb);
1075 nr = nfc_llcp_nr(skb);
1076
1077 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1078
1079 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1080 if (llcp_sock == NULL) {
1081 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1082 return;
1083 }
1084
1085 sk = &llcp_sock->sk;
1086 lock_sock(sk);
1087 if (sk->sk_state == LLCP_CLOSED) {
1088 release_sock(sk);
1089 nfc_llcp_sock_put(llcp_sock);
1090 }
1091
1092 /* Pass the payload upstream */
1093 if (ptype == LLCP_PDU_I) {
1094 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1095
1096 if (ns == llcp_sock->recv_n)
1097 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1098 else
1099 pr_err("Received out of sequence I PDU\n");
1100
1101 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1102 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1103 /*
1104 * I frames will be freed from the socket layer, so we
1105 * need to keep them alive until someone receives them.
1106 */
1107 skb_get(skb);
1108 } else {
1109 pr_err("Receive queue is full\n");
1110 }
1111 }
1112
1113 /* Remove skbs from the pending queue */
1114 if (llcp_sock->send_ack_n != nr) {
1115 struct sk_buff *s, *tmp;
1116 u8 n;
1117
1118 llcp_sock->send_ack_n = nr;
1119
1120 /* Remove and free all skbs until ns == nr */
1121 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1122 n = nfc_llcp_ns(s);
1123
1124 skb_unlink(s, &llcp_sock->tx_pending_queue);
1125 kfree_skb(s);
1126
1127 if (n == nr)
1128 break;
1129 }
1130
1131 /* Re-queue the remaining skbs for transmission */
1132 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1133 s, tmp) {
1134 skb_unlink(s, &llcp_sock->tx_pending_queue);
1135 skb_queue_head(&local->tx_queue, s);
1136 }
1137 }
1138
1139 if (ptype == LLCP_PDU_RR)
1140 llcp_sock->remote_ready = true;
1141 else if (ptype == LLCP_PDU_RNR)
1142 llcp_sock->remote_ready = false;
1143
1144 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1145 nfc_llcp_send_rr(llcp_sock);
1146
1147 release_sock(sk);
1148 nfc_llcp_sock_put(llcp_sock);
1149}
1150
1151static void nfc_llcp_recv_disc(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 if ((dsap == 0) && (ssap == 0)) {
1162 pr_debug("Connection termination");
1163 nfc_dep_link_down(local->dev);
1164 return;
1165 }
1166
1167 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1168 if (llcp_sock == NULL) {
1169 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1170 return;
1171 }
1172
1173 sk = &llcp_sock->sk;
1174 lock_sock(sk);
1175
1176 nfc_llcp_socket_purge(llcp_sock);
1177
1178 if (sk->sk_state == LLCP_CLOSED) {
1179 release_sock(sk);
1180 nfc_llcp_sock_put(llcp_sock);
1181 }
1182
1183 if (sk->sk_state == LLCP_CONNECTED) {
1184 nfc_put_device(local->dev);
1185 sk->sk_state = LLCP_CLOSED;
1186 sk->sk_state_change(sk);
1187 }
1188
1189 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1190
1191 release_sock(sk);
1192 nfc_llcp_sock_put(llcp_sock);
1193}
1194
1195static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1196 const struct sk_buff *skb)
1197{
1198 struct nfc_llcp_sock *llcp_sock;
1199 struct sock *sk;
1200 u8 dsap, ssap;
1201
1202 dsap = nfc_llcp_dsap(skb);
1203 ssap = nfc_llcp_ssap(skb);
1204
1205 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1206 if (llcp_sock == NULL) {
1207 pr_err("Invalid CC\n");
1208 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1209
1210 return;
1211 }
1212
1213 sk = &llcp_sock->sk;
1214
1215 /* Unlink from connecting and link to the client array */
1216 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1217 nfc_llcp_sock_link(&local->sockets, sk);
1218 llcp_sock->dsap = ssap;
1219
1220 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1221 skb->len - LLCP_HEADER_SIZE);
1222
1223 sk->sk_state = LLCP_CONNECTED;
1224 sk->sk_state_change(sk);
1225
1226 nfc_llcp_sock_put(llcp_sock);
1227}
1228
1229static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1230 const struct sk_buff *skb)
1231{
1232 struct nfc_llcp_sock *llcp_sock;
1233 struct sock *sk;
1234 u8 dsap, ssap, reason;
1235
1236 dsap = nfc_llcp_dsap(skb);
1237 ssap = nfc_llcp_ssap(skb);
1238 reason = skb->data[2];
1239
1240 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1241
1242 switch (reason) {
1243 case LLCP_DM_NOBOUND:
1244 case LLCP_DM_REJ:
1245 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1246 break;
1247
1248 default:
1249 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1250 break;
1251 }
1252
1253 if (llcp_sock == NULL) {
1254 pr_debug("Already closed\n");
1255 return;
1256 }
1257
1258 sk = &llcp_sock->sk;
1259
1260 sk->sk_err = ENXIO;
1261 sk->sk_state = LLCP_CLOSED;
1262 sk->sk_state_change(sk);
1263
1264 nfc_llcp_sock_put(llcp_sock);
1265}
1266
1267static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1268 const struct sk_buff *skb)
1269{
1270 struct nfc_llcp_sock *llcp_sock;
1271 u8 dsap, ssap, type, length, tid, sap;
1272 const u8 *tlv;
1273 u16 tlv_len, offset;
1274 const char *service_name;
1275 size_t service_name_len;
1276 struct nfc_llcp_sdp_tlv *sdp;
1277 HLIST_HEAD(llc_sdres_list);
1278 size_t sdres_tlvs_len;
1279 HLIST_HEAD(nl_sdres_list);
1280
1281 dsap = nfc_llcp_dsap(skb);
1282 ssap = nfc_llcp_ssap(skb);
1283
1284 pr_debug("%d %d\n", dsap, ssap);
1285
1286 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1287 pr_err("Wrong SNL SAP\n");
1288 return;
1289 }
1290
1291 tlv = &skb->data[LLCP_HEADER_SIZE];
1292 tlv_len = skb->len - LLCP_HEADER_SIZE;
1293 offset = 0;
1294 sdres_tlvs_len = 0;
1295
1296 while (offset < tlv_len) {
1297 type = tlv[0];
1298 length = tlv[1];
1299
1300 switch (type) {
1301 case LLCP_TLV_SDREQ:
1302 tid = tlv[2];
1303 service_name = (char *) &tlv[3];
1304 service_name_len = length - 1;
1305
1306 pr_debug("Looking for %.16s\n", service_name);
1307
1308 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1309 !strncmp(service_name, "urn:nfc:sn:sdp",
1310 service_name_len)) {
1311 sap = 1;
1312 goto add_snl;
1313 }
1314
1315 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1316 service_name_len,
1317 true);
1318 if (!llcp_sock) {
1319 sap = 0;
1320 goto add_snl;
1321 }
1322
1323 /*
1324 * We found a socket but its ssap has not been reserved
1325 * yet. We need to assign it for good and send a reply.
1326 * The ssap will be freed when the socket is closed.
1327 */
1328 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1329 atomic_t *client_count;
1330
1331 sap = nfc_llcp_reserve_sdp_ssap(local);
1332
1333 pr_debug("Reserving %d\n", sap);
1334
1335 if (sap == LLCP_SAP_MAX) {
1336 sap = 0;
1337 nfc_llcp_sock_put(llcp_sock);
1338 goto add_snl;
1339 }
1340
1341 client_count =
1342 &local->local_sdp_cnt[sap -
1343 LLCP_WKS_NUM_SAP];
1344
1345 atomic_inc(client_count);
1346
1347 llcp_sock->ssap = sap;
1348 llcp_sock->reserved_ssap = sap;
1349 } else {
1350 sap = llcp_sock->ssap;
1351 }
1352
1353 pr_debug("%p %d\n", llcp_sock, sap);
1354
1355 nfc_llcp_sock_put(llcp_sock);
1356add_snl:
1357 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1358 if (sdp == NULL)
1359 goto exit;
1360
1361 sdres_tlvs_len += sdp->tlv_len;
1362 hlist_add_head(&sdp->node, &llc_sdres_list);
1363 break;
1364
1365 case LLCP_TLV_SDRES:
1366 mutex_lock(&local->sdreq_lock);
1367
1368 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1369
1370 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1371 if (sdp->tid != tlv[2])
1372 continue;
1373
1374 sdp->sap = tlv[3];
1375
1376 pr_debug("Found: uri=%s, sap=%d\n",
1377 sdp->uri, sdp->sap);
1378
1379 hlist_del(&sdp->node);
1380
1381 hlist_add_head(&sdp->node, &nl_sdres_list);
1382
1383 break;
1384 }
1385
1386 mutex_unlock(&local->sdreq_lock);
1387 break;
1388
1389 default:
1390 pr_err("Invalid SNL tlv value 0x%x\n", type);
1391 break;
1392 }
1393
1394 offset += length + 2;
1395 tlv += length + 2;
1396 }
1397
1398exit:
1399 if (!hlist_empty(&nl_sdres_list))
1400 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1401
1402 if (!hlist_empty(&llc_sdres_list))
1403 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1404}
1405
1406static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1407{
1408 u8 ptype;
1409 u16 pdu_len;
1410 struct sk_buff *new_skb;
1411
1412 if (skb->len <= LLCP_HEADER_SIZE) {
1413 pr_err("Malformed AGF PDU\n");
1414 return;
1415 }
1416
1417 skb_pull(skb, LLCP_HEADER_SIZE);
1418
1419 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1420 pdu_len = skb->data[0] << 8 | skb->data[1];
1421
1422 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1423
1424 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1425 pr_err("Malformed AGF PDU\n");
1426 return;
1427 }
1428
1429 ptype = nfc_llcp_ptype(skb);
1430
1431 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1432 goto next;
1433
1434 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1435 if (new_skb == NULL) {
1436 pr_err("Could not allocate PDU\n");
1437 return;
1438 }
1439
1440 skb_put_data(new_skb, skb->data, pdu_len);
1441
1442 nfc_llcp_rx_skb(local, new_skb);
1443
1444 kfree_skb(new_skb);
1445next:
1446 skb_pull(skb, pdu_len);
1447 }
1448}
1449
1450static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1451{
1452 u8 dsap, ssap, ptype;
1453
1454 ptype = nfc_llcp_ptype(skb);
1455 dsap = nfc_llcp_dsap(skb);
1456 ssap = nfc_llcp_ssap(skb);
1457
1458 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1459
1460 if (ptype != LLCP_PDU_SYMM)
1461 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1462 skb->data, skb->len, true);
1463
1464 switch (ptype) {
1465 case LLCP_PDU_SYMM:
1466 pr_debug("SYMM\n");
1467 break;
1468
1469 case LLCP_PDU_UI:
1470 pr_debug("UI\n");
1471 nfc_llcp_recv_ui(local, skb);
1472 break;
1473
1474 case LLCP_PDU_CONNECT:
1475 pr_debug("CONNECT\n");
1476 nfc_llcp_recv_connect(local, skb);
1477 break;
1478
1479 case LLCP_PDU_DISC:
1480 pr_debug("DISC\n");
1481 nfc_llcp_recv_disc(local, skb);
1482 break;
1483
1484 case LLCP_PDU_CC:
1485 pr_debug("CC\n");
1486 nfc_llcp_recv_cc(local, skb);
1487 break;
1488
1489 case LLCP_PDU_DM:
1490 pr_debug("DM\n");
1491 nfc_llcp_recv_dm(local, skb);
1492 break;
1493
1494 case LLCP_PDU_SNL:
1495 pr_debug("SNL\n");
1496 nfc_llcp_recv_snl(local, skb);
1497 break;
1498
1499 case LLCP_PDU_I:
1500 case LLCP_PDU_RR:
1501 case LLCP_PDU_RNR:
1502 pr_debug("I frame\n");
1503 nfc_llcp_recv_hdlc(local, skb);
1504 break;
1505
1506 case LLCP_PDU_AGF:
1507 pr_debug("AGF frame\n");
1508 nfc_llcp_recv_agf(local, skb);
1509 break;
1510 }
1511}
1512
1513static void nfc_llcp_rx_work(struct work_struct *work)
1514{
1515 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1516 rx_work);
1517 struct sk_buff *skb;
1518
1519 skb = local->rx_pending;
1520 if (skb == NULL) {
1521 pr_debug("No pending SKB\n");
1522 return;
1523 }
1524
1525 __net_timestamp(skb);
1526
1527 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1528
1529 nfc_llcp_rx_skb(local, skb);
1530
1531 schedule_work(&local->tx_work);
1532 kfree_skb(local->rx_pending);
1533 local->rx_pending = NULL;
1534}
1535
1536static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1537{
1538 local->rx_pending = skb;
1539 del_timer(&local->link_timer);
1540 schedule_work(&local->rx_work);
1541}
1542
1543void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1544{
1545 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1546
1547 if (err < 0) {
1548 pr_err("LLCP PDU receive err %d\n", err);
1549 return;
1550 }
1551
1552 __nfc_llcp_recv(local, skb);
1553}
1554
1555int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1556{
1557 struct nfc_llcp_local *local;
1558
1559 local = nfc_llcp_find_local(dev);
1560 if (local == NULL) {
1561 kfree_skb(skb);
1562 return -ENODEV;
1563 }
1564
1565 __nfc_llcp_recv(local, skb);
1566
1567 nfc_llcp_local_put(local);
1568
1569 return 0;
1570}
1571
1572void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1573{
1574 struct nfc_llcp_local *local;
1575
1576 local = nfc_llcp_find_local(dev);
1577 if (local == NULL)
1578 return;
1579
1580 local->remote_miu = LLCP_DEFAULT_MIU;
1581 local->remote_lto = LLCP_DEFAULT_LTO;
1582
1583 /* Close and purge all existing sockets */
1584 nfc_llcp_socket_release(local, true, 0);
1585
1586 nfc_llcp_local_put(local);
1587}
1588
1589void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1590 u8 comm_mode, u8 rf_mode)
1591{
1592 struct nfc_llcp_local *local;
1593
1594 pr_debug("rf mode %d\n", rf_mode);
1595
1596 local = nfc_llcp_find_local(dev);
1597 if (local == NULL)
1598 return;
1599
1600 local->target_idx = target_idx;
1601 local->comm_mode = comm_mode;
1602 local->rf_mode = rf_mode;
1603
1604 if (rf_mode == NFC_RF_INITIATOR) {
1605 pr_debug("Queueing Tx work\n");
1606
1607 schedule_work(&local->tx_work);
1608 } else {
1609 mod_timer(&local->link_timer,
1610 jiffies + msecs_to_jiffies(local->remote_lto));
1611 }
1612
1613 nfc_llcp_local_put(local);
1614}
1615
1616int nfc_llcp_register_device(struct nfc_dev *ndev)
1617{
1618 struct nfc_llcp_local *local;
1619
1620 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1621 if (local == NULL)
1622 return -ENOMEM;
1623
1624 /* As we are going to initialize local's refcount, we need to get the
1625 * nfc_dev to avoid UAF, otherwise there is no point in continuing.
1626 * See nfc_llcp_local_get().
1627 */
1628 local->dev = nfc_get_device(ndev->idx);
1629 if (!local->dev) {
1630 kfree(local);
1631 return -ENODEV;
1632 }
1633
1634 INIT_LIST_HEAD(&local->list);
1635 kref_init(&local->ref);
1636 mutex_init(&local->sdp_lock);
1637 timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1638
1639 skb_queue_head_init(&local->tx_queue);
1640 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1641
1642 local->rx_pending = NULL;
1643 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1644
1645 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1646
1647 rwlock_init(&local->sockets.lock);
1648 rwlock_init(&local->connecting_sockets.lock);
1649 rwlock_init(&local->raw_sockets.lock);
1650
1651 local->lto = 150; /* 1500 ms */
1652 local->rw = LLCP_MAX_RW;
1653 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1654 local->local_wks = 0x1; /* LLC Link Management */
1655
1656 nfc_llcp_build_gb(local);
1657
1658 local->remote_miu = LLCP_DEFAULT_MIU;
1659 local->remote_lto = LLCP_DEFAULT_LTO;
1660
1661 mutex_init(&local->sdreq_lock);
1662 INIT_HLIST_HEAD(&local->pending_sdreqs);
1663 timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1664 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1665
1666 spin_lock(&llcp_devices_lock);
1667 list_add(&local->list, &llcp_devices);
1668 spin_unlock(&llcp_devices_lock);
1669
1670 return 0;
1671}
1672
1673void nfc_llcp_unregister_device(struct nfc_dev *dev)
1674{
1675 struct nfc_llcp_local *local = nfc_llcp_remove_local(dev);
1676
1677 if (local == NULL) {
1678 pr_debug("No such device\n");
1679 return;
1680 }
1681
1682 local_cleanup(local);
1683
1684 nfc_llcp_local_put(local);
1685}
1686
1687int __init nfc_llcp_init(void)
1688{
1689 return nfc_llcp_sock_init();
1690}
1691
1692void nfc_llcp_exit(void)
1693{
1694 nfc_llcp_sock_exit();
1695}