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NFC: st21nfca: Free buffer when a bad frame is detected
[deliverable/linux.git] / net / nfc / llcp_core.c
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, see <http://www.gnu.org/licenses/>.
16 */
17
18 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
19
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/list.h>
23 #include <linux/nfc.h>
24
25 #include "nfc.h"
26 #include "llcp.h"
27
28 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
29
30 static LIST_HEAD(llcp_devices);
31
32 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
33
34 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
35 {
36 write_lock(&l->lock);
37 sk_add_node(sk, &l->head);
38 write_unlock(&l->lock);
39 }
40
41 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
42 {
43 write_lock(&l->lock);
44 sk_del_node_init(sk);
45 write_unlock(&l->lock);
46 }
47
48 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
49 {
50 sock->remote_rw = LLCP_DEFAULT_RW;
51 sock->remote_miu = LLCP_MAX_MIU + 1;
52 }
53
54 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
55 {
56 struct nfc_llcp_local *local = sock->local;
57 struct sk_buff *s, *tmp;
58
59 pr_debug("%p\n", &sock->sk);
60
61 skb_queue_purge(&sock->tx_queue);
62 skb_queue_purge(&sock->tx_pending_queue);
63
64 if (local == NULL)
65 return;
66
67 /* Search for local pending SKBs that are related to this socket */
68 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
69 if (s->sk != &sock->sk)
70 continue;
71
72 skb_unlink(s, &local->tx_queue);
73 kfree_skb(s);
74 }
75 }
76
77 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
78 int err)
79 {
80 struct sock *sk;
81 struct hlist_node *tmp;
82 struct nfc_llcp_sock *llcp_sock;
83
84 skb_queue_purge(&local->tx_queue);
85
86 write_lock(&local->sockets.lock);
87
88 sk_for_each_safe(sk, tmp, &local->sockets.head) {
89 llcp_sock = nfc_llcp_sock(sk);
90
91 bh_lock_sock(sk);
92
93 nfc_llcp_socket_purge(llcp_sock);
94
95 if (sk->sk_state == LLCP_CONNECTED)
96 nfc_put_device(llcp_sock->dev);
97
98 if (sk->sk_state == LLCP_LISTEN) {
99 struct nfc_llcp_sock *lsk, *n;
100 struct sock *accept_sk;
101
102 list_for_each_entry_safe(lsk, n,
103 &llcp_sock->accept_queue,
104 accept_queue) {
105 accept_sk = &lsk->sk;
106 bh_lock_sock(accept_sk);
107
108 nfc_llcp_accept_unlink(accept_sk);
109
110 if (err)
111 accept_sk->sk_err = err;
112 accept_sk->sk_state = LLCP_CLOSED;
113 accept_sk->sk_state_change(sk);
114
115 bh_unlock_sock(accept_sk);
116 }
117 }
118
119 if (err)
120 sk->sk_err = err;
121 sk->sk_state = LLCP_CLOSED;
122 sk->sk_state_change(sk);
123
124 bh_unlock_sock(sk);
125
126 sk_del_node_init(sk);
127 }
128
129 write_unlock(&local->sockets.lock);
130
131 /* If we still have a device, we keep the RAW sockets alive */
132 if (device == true)
133 return;
134
135 write_lock(&local->raw_sockets.lock);
136
137 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
138 llcp_sock = nfc_llcp_sock(sk);
139
140 bh_lock_sock(sk);
141
142 nfc_llcp_socket_purge(llcp_sock);
143
144 if (err)
145 sk->sk_err = err;
146 sk->sk_state = LLCP_CLOSED;
147 sk->sk_state_change(sk);
148
149 bh_unlock_sock(sk);
150
151 sk_del_node_init(sk);
152 }
153
154 write_unlock(&local->raw_sockets.lock);
155 }
156
157 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
158 {
159 kref_get(&local->ref);
160
161 return local;
162 }
163
164 static void local_cleanup(struct nfc_llcp_local *local)
165 {
166 nfc_llcp_socket_release(local, false, ENXIO);
167 del_timer_sync(&local->link_timer);
168 skb_queue_purge(&local->tx_queue);
169 cancel_work_sync(&local->tx_work);
170 cancel_work_sync(&local->rx_work);
171 cancel_work_sync(&local->timeout_work);
172 kfree_skb(local->rx_pending);
173 del_timer_sync(&local->sdreq_timer);
174 cancel_work_sync(&local->sdreq_timeout_work);
175 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
176 }
177
178 static void local_release(struct kref *ref)
179 {
180 struct nfc_llcp_local *local;
181
182 local = container_of(ref, struct nfc_llcp_local, ref);
183
184 list_del(&local->list);
185 local_cleanup(local);
186 kfree(local);
187 }
188
189 int nfc_llcp_local_put(struct nfc_llcp_local *local)
190 {
191 if (local == NULL)
192 return 0;
193
194 return kref_put(&local->ref, local_release);
195 }
196
197 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
198 u8 ssap, u8 dsap)
199 {
200 struct sock *sk;
201 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
202
203 pr_debug("ssap dsap %d %d\n", ssap, dsap);
204
205 if (ssap == 0 && dsap == 0)
206 return NULL;
207
208 read_lock(&local->sockets.lock);
209
210 llcp_sock = NULL;
211
212 sk_for_each(sk, &local->sockets.head) {
213 tmp_sock = nfc_llcp_sock(sk);
214
215 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
216 llcp_sock = tmp_sock;
217 break;
218 }
219 }
220
221 read_unlock(&local->sockets.lock);
222
223 if (llcp_sock == NULL)
224 return NULL;
225
226 sock_hold(&llcp_sock->sk);
227
228 return llcp_sock;
229 }
230
231 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
232 {
233 sock_put(&sock->sk);
234 }
235
236 static 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
244 static void nfc_llcp_symm_timer(unsigned long data)
245 {
246 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
247
248 pr_err("SYMM timeout\n");
249
250 schedule_work(&local->timeout_work);
251 }
252
253 static 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
287 static void nfc_llcp_sdreq_timer(unsigned long data)
288 {
289 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
290
291 schedule_work(&local->sdreq_timeout_work);
292 }
293
294 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
295 {
296 struct nfc_llcp_local *local;
297
298 list_for_each_entry(local, &llcp_devices, list)
299 if (local->dev == dev)
300 return local;
301
302 pr_debug("No device found\n");
303
304 return NULL;
305 }
306
307 static char *wks[] = {
308 NULL,
309 NULL, /* SDP */
310 "urn:nfc:sn:ip",
311 "urn:nfc:sn:obex",
312 "urn:nfc:sn:snep",
313 };
314
315 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
316 {
317 int sap, num_wks;
318
319 pr_debug("%s\n", service_name);
320
321 if (service_name == NULL)
322 return -EINVAL;
323
324 num_wks = ARRAY_SIZE(wks);
325
326 for (sap = 0; sap < num_wks; sap++) {
327 if (wks[sap] == NULL)
328 continue;
329
330 if (strncmp(wks[sap], service_name, service_name_len) == 0)
331 return sap;
332 }
333
334 return -EINVAL;
335 }
336
337 static
338 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
339 u8 *sn, size_t sn_len)
340 {
341 struct sock *sk;
342 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
343
344 pr_debug("sn %zd %p\n", sn_len, sn);
345
346 if (sn == NULL || sn_len == 0)
347 return NULL;
348
349 read_lock(&local->sockets.lock);
350
351 llcp_sock = NULL;
352
353 sk_for_each(sk, &local->sockets.head) {
354 tmp_sock = nfc_llcp_sock(sk);
355
356 pr_debug("llcp sock %p\n", tmp_sock);
357
358 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
359 tmp_sock->sk.sk_state != LLCP_LISTEN)
360 continue;
361
362 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
363 tmp_sock->sk.sk_state != LLCP_BOUND)
364 continue;
365
366 if (tmp_sock->service_name == NULL ||
367 tmp_sock->service_name_len == 0)
368 continue;
369
370 if (tmp_sock->service_name_len != sn_len)
371 continue;
372
373 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
374 llcp_sock = tmp_sock;
375 break;
376 }
377 }
378
379 read_unlock(&local->sockets.lock);
380
381 pr_debug("Found llcp sock %p\n", llcp_sock);
382
383 return llcp_sock;
384 }
385
386 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
387 struct nfc_llcp_sock *sock)
388 {
389 mutex_lock(&local->sdp_lock);
390
391 if (sock->service_name != NULL && sock->service_name_len > 0) {
392 int ssap = nfc_llcp_wks_sap(sock->service_name,
393 sock->service_name_len);
394
395 if (ssap > 0) {
396 pr_debug("WKS %d\n", ssap);
397
398 /* This is a WKS, let's check if it's free */
399 if (local->local_wks & BIT(ssap)) {
400 mutex_unlock(&local->sdp_lock);
401
402 return LLCP_SAP_MAX;
403 }
404
405 set_bit(ssap, &local->local_wks);
406 mutex_unlock(&local->sdp_lock);
407
408 return ssap;
409 }
410
411 /*
412 * Check if there already is a non WKS socket bound
413 * to this service name.
414 */
415 if (nfc_llcp_sock_from_sn(local, sock->service_name,
416 sock->service_name_len) != NULL) {
417 mutex_unlock(&local->sdp_lock);
418
419 return LLCP_SAP_MAX;
420 }
421
422 mutex_unlock(&local->sdp_lock);
423
424 return LLCP_SDP_UNBOUND;
425
426 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
427 if (!test_bit(sock->ssap, &local->local_wks)) {
428 set_bit(sock->ssap, &local->local_wks);
429 mutex_unlock(&local->sdp_lock);
430
431 return sock->ssap;
432 }
433 }
434
435 mutex_unlock(&local->sdp_lock);
436
437 return LLCP_SAP_MAX;
438 }
439
440 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
441 {
442 u8 local_ssap;
443
444 mutex_lock(&local->sdp_lock);
445
446 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
447 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
448 mutex_unlock(&local->sdp_lock);
449 return LLCP_SAP_MAX;
450 }
451
452 set_bit(local_ssap, &local->local_sap);
453
454 mutex_unlock(&local->sdp_lock);
455
456 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
457 }
458
459 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
460 {
461 u8 local_ssap;
462 unsigned long *sdp;
463
464 if (ssap < LLCP_WKS_NUM_SAP) {
465 local_ssap = ssap;
466 sdp = &local->local_wks;
467 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
468 atomic_t *client_cnt;
469
470 local_ssap = ssap - LLCP_WKS_NUM_SAP;
471 sdp = &local->local_sdp;
472 client_cnt = &local->local_sdp_cnt[local_ssap];
473
474 pr_debug("%d clients\n", atomic_read(client_cnt));
475
476 mutex_lock(&local->sdp_lock);
477
478 if (atomic_dec_and_test(client_cnt)) {
479 struct nfc_llcp_sock *l_sock;
480
481 pr_debug("No more clients for SAP %d\n", ssap);
482
483 clear_bit(local_ssap, sdp);
484
485 /* Find the listening sock and set it back to UNBOUND */
486 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
487 if (l_sock) {
488 l_sock->ssap = LLCP_SDP_UNBOUND;
489 nfc_llcp_sock_put(l_sock);
490 }
491 }
492
493 mutex_unlock(&local->sdp_lock);
494
495 return;
496 } else if (ssap < LLCP_MAX_SAP) {
497 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
498 sdp = &local->local_sap;
499 } else {
500 return;
501 }
502
503 mutex_lock(&local->sdp_lock);
504
505 clear_bit(local_ssap, sdp);
506
507 mutex_unlock(&local->sdp_lock);
508 }
509
510 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
511 {
512 u8 ssap;
513
514 mutex_lock(&local->sdp_lock);
515
516 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
517 if (ssap == LLCP_SDP_NUM_SAP) {
518 mutex_unlock(&local->sdp_lock);
519
520 return LLCP_SAP_MAX;
521 }
522
523 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
524
525 set_bit(ssap, &local->local_sdp);
526
527 mutex_unlock(&local->sdp_lock);
528
529 return LLCP_WKS_NUM_SAP + ssap;
530 }
531
532 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
533 {
534 u8 *gb_cur, *version_tlv, version, version_length;
535 u8 *lto_tlv, lto_length;
536 u8 *wks_tlv, wks_length;
537 u8 *miux_tlv, miux_length;
538 __be16 wks = cpu_to_be16(local->local_wks);
539 u8 gb_len = 0;
540 int ret = 0;
541
542 version = LLCP_VERSION_11;
543 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
544 1, &version_length);
545 gb_len += version_length;
546
547 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
548 gb_len += lto_length;
549
550 pr_debug("Local wks 0x%lx\n", local->local_wks);
551 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
552 gb_len += wks_length;
553
554 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
555 &miux_length);
556 gb_len += miux_length;
557
558 gb_len += ARRAY_SIZE(llcp_magic);
559
560 if (gb_len > NFC_MAX_GT_LEN) {
561 ret = -EINVAL;
562 goto out;
563 }
564
565 gb_cur = local->gb;
566
567 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
568 gb_cur += ARRAY_SIZE(llcp_magic);
569
570 memcpy(gb_cur, version_tlv, version_length);
571 gb_cur += version_length;
572
573 memcpy(gb_cur, lto_tlv, lto_length);
574 gb_cur += lto_length;
575
576 memcpy(gb_cur, wks_tlv, wks_length);
577 gb_cur += wks_length;
578
579 memcpy(gb_cur, miux_tlv, miux_length);
580 gb_cur += miux_length;
581
582 local->gb_len = gb_len;
583
584 out:
585 kfree(version_tlv);
586 kfree(lto_tlv);
587 kfree(wks_tlv);
588 kfree(miux_tlv);
589
590 return ret;
591 }
592
593 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
594 {
595 struct nfc_llcp_local *local;
596
597 local = nfc_llcp_find_local(dev);
598 if (local == NULL) {
599 *general_bytes_len = 0;
600 return NULL;
601 }
602
603 nfc_llcp_build_gb(local);
604
605 *general_bytes_len = local->gb_len;
606
607 return local->gb;
608 }
609
610 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
611 {
612 struct nfc_llcp_local *local;
613
614 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
615 return -EINVAL;
616
617 local = nfc_llcp_find_local(dev);
618 if (local == NULL) {
619 pr_err("No LLCP device\n");
620 return -ENODEV;
621 }
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
637 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
638 {
639 return (pdu->data[0] & 0xfc) >> 2;
640 }
641
642 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
643 {
644 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
645 }
646
647 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
648 {
649 return pdu->data[1] & 0x3f;
650 }
651
652 static u8 nfc_llcp_ns(struct sk_buff *pdu)
653 {
654 return pdu->data[2] >> 4;
655 }
656
657 static u8 nfc_llcp_nr(struct sk_buff *pdu)
658 {
659 return pdu->data[2] & 0xf;
660 }
661
662 static 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
669 void 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
708 static 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 kfree_skb(skb);
723 nfc_llcp_send_symm(local->dev);
724 } else if (llcp_sock && !llcp_sock->remote_ready) {
725 skb_queue_head(&local->tx_queue, skb);
726 nfc_llcp_send_symm(local->dev);
727 } else {
728 struct sk_buff *copy_skb = NULL;
729 u8 ptype = nfc_llcp_ptype(skb);
730 int ret;
731
732 pr_debug("Sending pending skb\n");
733 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
734 DUMP_PREFIX_OFFSET, 16, 1,
735 skb->data, skb->len, true);
736
737 if (ptype == LLCP_PDU_DISC && sk != NULL &&
738 sk->sk_state == LLCP_DISCONNECTING) {
739 nfc_llcp_sock_unlink(&local->sockets, sk);
740 sock_orphan(sk);
741 sock_put(sk);
742 }
743
744 if (ptype == LLCP_PDU_I)
745 copy_skb = skb_copy(skb, GFP_ATOMIC);
746
747 __net_timestamp(skb);
748
749 nfc_llcp_send_to_raw_sock(local, skb,
750 NFC_LLCP_DIRECTION_TX);
751
752 ret = nfc_data_exchange(local->dev, local->target_idx,
753 skb, nfc_llcp_recv, local);
754
755 if (ret) {
756 kfree_skb(copy_skb);
757 goto out;
758 }
759
760 if (ptype == LLCP_PDU_I && copy_skb)
761 skb_queue_tail(&llcp_sock->tx_pending_queue,
762 copy_skb);
763 }
764 } else {
765 nfc_llcp_send_symm(local->dev);
766 }
767
768 out:
769 mod_timer(&local->link_timer,
770 jiffies + msecs_to_jiffies(2 * local->remote_lto));
771 }
772
773 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
774 u8 ssap)
775 {
776 struct sock *sk;
777 struct nfc_llcp_sock *llcp_sock;
778
779 read_lock(&local->connecting_sockets.lock);
780
781 sk_for_each(sk, &local->connecting_sockets.head) {
782 llcp_sock = nfc_llcp_sock(sk);
783
784 if (llcp_sock->ssap == ssap) {
785 sock_hold(&llcp_sock->sk);
786 goto out;
787 }
788 }
789
790 llcp_sock = NULL;
791
792 out:
793 read_unlock(&local->connecting_sockets.lock);
794
795 return llcp_sock;
796 }
797
798 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
799 u8 *sn, size_t sn_len)
800 {
801 struct nfc_llcp_sock *llcp_sock;
802
803 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
804
805 if (llcp_sock == NULL)
806 return NULL;
807
808 sock_hold(&llcp_sock->sk);
809
810 return llcp_sock;
811 }
812
813 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
814 {
815 u8 *tlv = &skb->data[2], type, length;
816 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
817
818 while (offset < tlv_array_len) {
819 type = tlv[0];
820 length = tlv[1];
821
822 pr_debug("type 0x%x length %d\n", type, length);
823
824 if (type == LLCP_TLV_SN) {
825 *sn_len = length;
826 return &tlv[2];
827 }
828
829 offset += length + 2;
830 tlv += length + 2;
831 }
832
833 return NULL;
834 }
835
836 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
837 struct sk_buff *skb)
838 {
839 struct nfc_llcp_sock *llcp_sock;
840 struct nfc_llcp_ui_cb *ui_cb;
841 u8 dsap, ssap;
842
843 dsap = nfc_llcp_dsap(skb);
844 ssap = nfc_llcp_ssap(skb);
845
846 ui_cb = nfc_llcp_ui_skb_cb(skb);
847 ui_cb->dsap = dsap;
848 ui_cb->ssap = ssap;
849
850 pr_debug("%d %d\n", dsap, ssap);
851
852 /* We're looking for a bound socket, not a client one */
853 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
854 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
855 return;
856
857 /* There is no sequence with UI frames */
858 skb_pull(skb, LLCP_HEADER_SIZE);
859 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
860 /*
861 * UI frames will be freed from the socket layer, so we
862 * need to keep them alive until someone receives them.
863 */
864 skb_get(skb);
865 } else {
866 pr_err("Receive queue is full\n");
867 }
868
869 nfc_llcp_sock_put(llcp_sock);
870 }
871
872 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
873 struct sk_buff *skb)
874 {
875 struct sock *new_sk, *parent;
876 struct nfc_llcp_sock *sock, *new_sock;
877 u8 dsap, ssap, reason;
878
879 dsap = nfc_llcp_dsap(skb);
880 ssap = nfc_llcp_ssap(skb);
881
882 pr_debug("%d %d\n", dsap, ssap);
883
884 if (dsap != LLCP_SAP_SDP) {
885 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
886 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
887 reason = LLCP_DM_NOBOUND;
888 goto fail;
889 }
890 } else {
891 u8 *sn;
892 size_t sn_len;
893
894 sn = nfc_llcp_connect_sn(skb, &sn_len);
895 if (sn == NULL) {
896 reason = LLCP_DM_NOBOUND;
897 goto fail;
898 }
899
900 pr_debug("Service name length %zu\n", sn_len);
901
902 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
903 if (sock == NULL) {
904 reason = LLCP_DM_NOBOUND;
905 goto fail;
906 }
907 }
908
909 lock_sock(&sock->sk);
910
911 parent = &sock->sk;
912
913 if (sk_acceptq_is_full(parent)) {
914 reason = LLCP_DM_REJ;
915 release_sock(&sock->sk);
916 sock_put(&sock->sk);
917 goto fail;
918 }
919
920 if (sock->ssap == LLCP_SDP_UNBOUND) {
921 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
922
923 pr_debug("First client, reserving %d\n", ssap);
924
925 if (ssap == LLCP_SAP_MAX) {
926 reason = LLCP_DM_REJ;
927 release_sock(&sock->sk);
928 sock_put(&sock->sk);
929 goto fail;
930 }
931
932 sock->ssap = ssap;
933 }
934
935 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
936 if (new_sk == NULL) {
937 reason = LLCP_DM_REJ;
938 release_sock(&sock->sk);
939 sock_put(&sock->sk);
940 goto fail;
941 }
942
943 new_sock = nfc_llcp_sock(new_sk);
944 new_sock->dev = local->dev;
945 new_sock->local = nfc_llcp_local_get(local);
946 new_sock->rw = sock->rw;
947 new_sock->miux = sock->miux;
948 new_sock->nfc_protocol = sock->nfc_protocol;
949 new_sock->dsap = ssap;
950 new_sock->target_idx = local->target_idx;
951 new_sock->parent = parent;
952 new_sock->ssap = sock->ssap;
953 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
954 atomic_t *client_count;
955
956 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
957
958 client_count =
959 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
960
961 atomic_inc(client_count);
962 new_sock->reserved_ssap = sock->ssap;
963 }
964
965 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
966 skb->len - LLCP_HEADER_SIZE);
967
968 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
969
970 nfc_llcp_sock_link(&local->sockets, new_sk);
971
972 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
973
974 nfc_get_device(local->dev->idx);
975
976 new_sk->sk_state = LLCP_CONNECTED;
977
978 /* Wake the listening processes */
979 parent->sk_data_ready(parent);
980
981 /* Send CC */
982 nfc_llcp_send_cc(new_sock);
983
984 release_sock(&sock->sk);
985 sock_put(&sock->sk);
986
987 return;
988
989 fail:
990 /* Send DM */
991 nfc_llcp_send_dm(local, dsap, ssap, reason);
992 }
993
994 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
995 {
996 int nr_frames = 0;
997 struct nfc_llcp_local *local = sock->local;
998
999 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1000 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1001 sock->remote_rw);
1002
1003 /* Try to queue some I frames for transmission */
1004 while (sock->remote_ready &&
1005 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1006 struct sk_buff *pdu;
1007
1008 pdu = skb_dequeue(&sock->tx_queue);
1009 if (pdu == NULL)
1010 break;
1011
1012 /* Update N(S)/N(R) */
1013 nfc_llcp_set_nrns(sock, pdu);
1014
1015 skb_queue_tail(&local->tx_queue, pdu);
1016 nr_frames++;
1017 }
1018
1019 return nr_frames;
1020 }
1021
1022 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1023 struct sk_buff *skb)
1024 {
1025 struct nfc_llcp_sock *llcp_sock;
1026 struct sock *sk;
1027 u8 dsap, ssap, ptype, ns, nr;
1028
1029 ptype = nfc_llcp_ptype(skb);
1030 dsap = nfc_llcp_dsap(skb);
1031 ssap = nfc_llcp_ssap(skb);
1032 ns = nfc_llcp_ns(skb);
1033 nr = nfc_llcp_nr(skb);
1034
1035 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1036
1037 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1038 if (llcp_sock == NULL) {
1039 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1040 return;
1041 }
1042
1043 sk = &llcp_sock->sk;
1044 lock_sock(sk);
1045 if (sk->sk_state == LLCP_CLOSED) {
1046 release_sock(sk);
1047 nfc_llcp_sock_put(llcp_sock);
1048 }
1049
1050 /* Pass the payload upstream */
1051 if (ptype == LLCP_PDU_I) {
1052 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1053
1054 if (ns == llcp_sock->recv_n)
1055 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1056 else
1057 pr_err("Received out of sequence I PDU\n");
1058
1059 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1060 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1061 /*
1062 * I frames will be freed from the socket layer, so we
1063 * need to keep them alive until someone receives them.
1064 */
1065 skb_get(skb);
1066 } else {
1067 pr_err("Receive queue is full\n");
1068 }
1069 }
1070
1071 /* Remove skbs from the pending queue */
1072 if (llcp_sock->send_ack_n != nr) {
1073 struct sk_buff *s, *tmp;
1074 u8 n;
1075
1076 llcp_sock->send_ack_n = nr;
1077
1078 /* Remove and free all skbs until ns == nr */
1079 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1080 n = nfc_llcp_ns(s);
1081
1082 skb_unlink(s, &llcp_sock->tx_pending_queue);
1083 kfree_skb(s);
1084
1085 if (n == nr)
1086 break;
1087 }
1088
1089 /* Re-queue the remaining skbs for transmission */
1090 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1091 s, tmp) {
1092 skb_unlink(s, &llcp_sock->tx_pending_queue);
1093 skb_queue_head(&local->tx_queue, s);
1094 }
1095 }
1096
1097 if (ptype == LLCP_PDU_RR)
1098 llcp_sock->remote_ready = true;
1099 else if (ptype == LLCP_PDU_RNR)
1100 llcp_sock->remote_ready = false;
1101
1102 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1103 nfc_llcp_send_rr(llcp_sock);
1104
1105 release_sock(sk);
1106 nfc_llcp_sock_put(llcp_sock);
1107 }
1108
1109 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1110 struct sk_buff *skb)
1111 {
1112 struct nfc_llcp_sock *llcp_sock;
1113 struct sock *sk;
1114 u8 dsap, ssap;
1115
1116 dsap = nfc_llcp_dsap(skb);
1117 ssap = nfc_llcp_ssap(skb);
1118
1119 if ((dsap == 0) && (ssap == 0)) {
1120 pr_debug("Connection termination");
1121 nfc_dep_link_down(local->dev);
1122 return;
1123 }
1124
1125 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1126 if (llcp_sock == NULL) {
1127 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1128 return;
1129 }
1130
1131 sk = &llcp_sock->sk;
1132 lock_sock(sk);
1133
1134 nfc_llcp_socket_purge(llcp_sock);
1135
1136 if (sk->sk_state == LLCP_CLOSED) {
1137 release_sock(sk);
1138 nfc_llcp_sock_put(llcp_sock);
1139 }
1140
1141 if (sk->sk_state == LLCP_CONNECTED) {
1142 nfc_put_device(local->dev);
1143 sk->sk_state = LLCP_CLOSED;
1144 sk->sk_state_change(sk);
1145 }
1146
1147 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1148
1149 release_sock(sk);
1150 nfc_llcp_sock_put(llcp_sock);
1151 }
1152
1153 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1154 {
1155 struct nfc_llcp_sock *llcp_sock;
1156 struct sock *sk;
1157 u8 dsap, ssap;
1158
1159 dsap = nfc_llcp_dsap(skb);
1160 ssap = nfc_llcp_ssap(skb);
1161
1162 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1163 if (llcp_sock == NULL) {
1164 pr_err("Invalid CC\n");
1165 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1166
1167 return;
1168 }
1169
1170 sk = &llcp_sock->sk;
1171
1172 /* Unlink from connecting and link to the client array */
1173 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1174 nfc_llcp_sock_link(&local->sockets, sk);
1175 llcp_sock->dsap = ssap;
1176
1177 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1178 skb->len - LLCP_HEADER_SIZE);
1179
1180 sk->sk_state = LLCP_CONNECTED;
1181 sk->sk_state_change(sk);
1182
1183 nfc_llcp_sock_put(llcp_sock);
1184 }
1185
1186 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1187 {
1188 struct nfc_llcp_sock *llcp_sock;
1189 struct sock *sk;
1190 u8 dsap, ssap, reason;
1191
1192 dsap = nfc_llcp_dsap(skb);
1193 ssap = nfc_llcp_ssap(skb);
1194 reason = skb->data[2];
1195
1196 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1197
1198 switch (reason) {
1199 case LLCP_DM_NOBOUND:
1200 case LLCP_DM_REJ:
1201 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1202 break;
1203
1204 default:
1205 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1206 break;
1207 }
1208
1209 if (llcp_sock == NULL) {
1210 pr_debug("Already closed\n");
1211 return;
1212 }
1213
1214 sk = &llcp_sock->sk;
1215
1216 sk->sk_err = ENXIO;
1217 sk->sk_state = LLCP_CLOSED;
1218 sk->sk_state_change(sk);
1219
1220 nfc_llcp_sock_put(llcp_sock);
1221 }
1222
1223 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1224 struct sk_buff *skb)
1225 {
1226 struct nfc_llcp_sock *llcp_sock;
1227 u8 dsap, ssap, *tlv, type, length, tid, sap;
1228 u16 tlv_len, offset;
1229 char *service_name;
1230 size_t service_name_len;
1231 struct nfc_llcp_sdp_tlv *sdp;
1232 HLIST_HEAD(llc_sdres_list);
1233 size_t sdres_tlvs_len;
1234 HLIST_HEAD(nl_sdres_list);
1235
1236 dsap = nfc_llcp_dsap(skb);
1237 ssap = nfc_llcp_ssap(skb);
1238
1239 pr_debug("%d %d\n", dsap, ssap);
1240
1241 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1242 pr_err("Wrong SNL SAP\n");
1243 return;
1244 }
1245
1246 tlv = &skb->data[LLCP_HEADER_SIZE];
1247 tlv_len = skb->len - LLCP_HEADER_SIZE;
1248 offset = 0;
1249 sdres_tlvs_len = 0;
1250
1251 while (offset < tlv_len) {
1252 type = tlv[0];
1253 length = tlv[1];
1254
1255 switch (type) {
1256 case LLCP_TLV_SDREQ:
1257 tid = tlv[2];
1258 service_name = (char *) &tlv[3];
1259 service_name_len = length - 1;
1260
1261 pr_debug("Looking for %.16s\n", service_name);
1262
1263 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1264 !strncmp(service_name, "urn:nfc:sn:sdp",
1265 service_name_len)) {
1266 sap = 1;
1267 goto add_snl;
1268 }
1269
1270 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1271 service_name_len);
1272 if (!llcp_sock) {
1273 sap = 0;
1274 goto add_snl;
1275 }
1276
1277 /*
1278 * We found a socket but its ssap has not been reserved
1279 * yet. We need to assign it for good and send a reply.
1280 * The ssap will be freed when the socket is closed.
1281 */
1282 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1283 atomic_t *client_count;
1284
1285 sap = nfc_llcp_reserve_sdp_ssap(local);
1286
1287 pr_debug("Reserving %d\n", sap);
1288
1289 if (sap == LLCP_SAP_MAX) {
1290 sap = 0;
1291 goto add_snl;
1292 }
1293
1294 client_count =
1295 &local->local_sdp_cnt[sap -
1296 LLCP_WKS_NUM_SAP];
1297
1298 atomic_inc(client_count);
1299
1300 llcp_sock->ssap = sap;
1301 llcp_sock->reserved_ssap = sap;
1302 } else {
1303 sap = llcp_sock->ssap;
1304 }
1305
1306 pr_debug("%p %d\n", llcp_sock, sap);
1307
1308 add_snl:
1309 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1310 if (sdp == NULL)
1311 goto exit;
1312
1313 sdres_tlvs_len += sdp->tlv_len;
1314 hlist_add_head(&sdp->node, &llc_sdres_list);
1315 break;
1316
1317 case LLCP_TLV_SDRES:
1318 mutex_lock(&local->sdreq_lock);
1319
1320 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1321
1322 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1323 if (sdp->tid != tlv[2])
1324 continue;
1325
1326 sdp->sap = tlv[3];
1327
1328 pr_debug("Found: uri=%s, sap=%d\n",
1329 sdp->uri, sdp->sap);
1330
1331 hlist_del(&sdp->node);
1332
1333 hlist_add_head(&sdp->node, &nl_sdres_list);
1334
1335 break;
1336 }
1337
1338 mutex_unlock(&local->sdreq_lock);
1339 break;
1340
1341 default:
1342 pr_err("Invalid SNL tlv value 0x%x\n", type);
1343 break;
1344 }
1345
1346 offset += length + 2;
1347 tlv += length + 2;
1348 }
1349
1350 exit:
1351 if (!hlist_empty(&nl_sdres_list))
1352 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1353
1354 if (!hlist_empty(&llc_sdres_list))
1355 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1356 }
1357
1358 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1359 {
1360 u8 ptype;
1361 u16 pdu_len;
1362 struct sk_buff *new_skb;
1363
1364 if (skb->len <= LLCP_HEADER_SIZE) {
1365 pr_err("Malformed AGF PDU\n");
1366 return;
1367 }
1368
1369 skb_pull(skb, LLCP_HEADER_SIZE);
1370
1371 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1372 pdu_len = skb->data[0] << 8 | skb->data[1];
1373
1374 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1375
1376 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1377 pr_err("Malformed AGF PDU\n");
1378 return;
1379 }
1380
1381 ptype = nfc_llcp_ptype(skb);
1382
1383 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1384 goto next;
1385
1386 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1387 if (new_skb == NULL) {
1388 pr_err("Could not allocate PDU\n");
1389 return;
1390 }
1391
1392 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1393
1394 nfc_llcp_rx_skb(local, new_skb);
1395
1396 kfree_skb(new_skb);
1397 next:
1398 skb_pull(skb, pdu_len);
1399 }
1400 }
1401
1402 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1403 {
1404 u8 dsap, ssap, ptype;
1405
1406 ptype = nfc_llcp_ptype(skb);
1407 dsap = nfc_llcp_dsap(skb);
1408 ssap = nfc_llcp_ssap(skb);
1409
1410 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1411
1412 if (ptype != LLCP_PDU_SYMM)
1413 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1414 16, 1, skb->data, skb->len, true);
1415
1416 switch (ptype) {
1417 case LLCP_PDU_SYMM:
1418 pr_debug("SYMM\n");
1419 break;
1420
1421 case LLCP_PDU_UI:
1422 pr_debug("UI\n");
1423 nfc_llcp_recv_ui(local, skb);
1424 break;
1425
1426 case LLCP_PDU_CONNECT:
1427 pr_debug("CONNECT\n");
1428 nfc_llcp_recv_connect(local, skb);
1429 break;
1430
1431 case LLCP_PDU_DISC:
1432 pr_debug("DISC\n");
1433 nfc_llcp_recv_disc(local, skb);
1434 break;
1435
1436 case LLCP_PDU_CC:
1437 pr_debug("CC\n");
1438 nfc_llcp_recv_cc(local, skb);
1439 break;
1440
1441 case LLCP_PDU_DM:
1442 pr_debug("DM\n");
1443 nfc_llcp_recv_dm(local, skb);
1444 break;
1445
1446 case LLCP_PDU_SNL:
1447 pr_debug("SNL\n");
1448 nfc_llcp_recv_snl(local, skb);
1449 break;
1450
1451 case LLCP_PDU_I:
1452 case LLCP_PDU_RR:
1453 case LLCP_PDU_RNR:
1454 pr_debug("I frame\n");
1455 nfc_llcp_recv_hdlc(local, skb);
1456 break;
1457
1458 case LLCP_PDU_AGF:
1459 pr_debug("AGF frame\n");
1460 nfc_llcp_recv_agf(local, skb);
1461 break;
1462 }
1463 }
1464
1465 static void nfc_llcp_rx_work(struct work_struct *work)
1466 {
1467 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1468 rx_work);
1469 struct sk_buff *skb;
1470
1471 skb = local->rx_pending;
1472 if (skb == NULL) {
1473 pr_debug("No pending SKB\n");
1474 return;
1475 }
1476
1477 __net_timestamp(skb);
1478
1479 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1480
1481 nfc_llcp_rx_skb(local, skb);
1482
1483 schedule_work(&local->tx_work);
1484 kfree_skb(local->rx_pending);
1485 local->rx_pending = NULL;
1486 }
1487
1488 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1489 {
1490 local->rx_pending = skb;
1491 del_timer(&local->link_timer);
1492 schedule_work(&local->rx_work);
1493 }
1494
1495 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1496 {
1497 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1498
1499 pr_debug("Received an LLCP PDU\n");
1500 if (err < 0) {
1501 pr_err("err %d\n", err);
1502 return;
1503 }
1504
1505 __nfc_llcp_recv(local, skb);
1506 }
1507
1508 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1509 {
1510 struct nfc_llcp_local *local;
1511
1512 local = nfc_llcp_find_local(dev);
1513 if (local == NULL)
1514 return -ENODEV;
1515
1516 __nfc_llcp_recv(local, skb);
1517
1518 return 0;
1519 }
1520
1521 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1522 {
1523 struct nfc_llcp_local *local;
1524
1525 local = nfc_llcp_find_local(dev);
1526 if (local == NULL)
1527 return;
1528
1529 local->remote_miu = LLCP_DEFAULT_MIU;
1530 local->remote_lto = LLCP_DEFAULT_LTO;
1531
1532 /* Close and purge all existing sockets */
1533 nfc_llcp_socket_release(local, true, 0);
1534 }
1535
1536 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1537 u8 comm_mode, u8 rf_mode)
1538 {
1539 struct nfc_llcp_local *local;
1540
1541 pr_debug("rf mode %d\n", rf_mode);
1542
1543 local = nfc_llcp_find_local(dev);
1544 if (local == NULL)
1545 return;
1546
1547 local->target_idx = target_idx;
1548 local->comm_mode = comm_mode;
1549 local->rf_mode = rf_mode;
1550
1551 if (rf_mode == NFC_RF_INITIATOR) {
1552 pr_debug("Queueing Tx work\n");
1553
1554 schedule_work(&local->tx_work);
1555 } else {
1556 mod_timer(&local->link_timer,
1557 jiffies + msecs_to_jiffies(local->remote_lto));
1558 }
1559 }
1560
1561 int nfc_llcp_register_device(struct nfc_dev *ndev)
1562 {
1563 struct nfc_llcp_local *local;
1564
1565 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1566 if (local == NULL)
1567 return -ENOMEM;
1568
1569 local->dev = ndev;
1570 INIT_LIST_HEAD(&local->list);
1571 kref_init(&local->ref);
1572 mutex_init(&local->sdp_lock);
1573 init_timer(&local->link_timer);
1574 local->link_timer.data = (unsigned long) local;
1575 local->link_timer.function = nfc_llcp_symm_timer;
1576
1577 skb_queue_head_init(&local->tx_queue);
1578 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1579
1580 local->rx_pending = NULL;
1581 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1582
1583 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1584
1585 rwlock_init(&local->sockets.lock);
1586 rwlock_init(&local->connecting_sockets.lock);
1587 rwlock_init(&local->raw_sockets.lock);
1588
1589 local->lto = 150; /* 1500 ms */
1590 local->rw = LLCP_MAX_RW;
1591 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1592 local->local_wks = 0x1; /* LLC Link Management */
1593
1594 nfc_llcp_build_gb(local);
1595
1596 local->remote_miu = LLCP_DEFAULT_MIU;
1597 local->remote_lto = LLCP_DEFAULT_LTO;
1598
1599 mutex_init(&local->sdreq_lock);
1600 INIT_HLIST_HEAD(&local->pending_sdreqs);
1601 init_timer(&local->sdreq_timer);
1602 local->sdreq_timer.data = (unsigned long) local;
1603 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1604 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1605
1606 list_add(&local->list, &llcp_devices);
1607
1608 return 0;
1609 }
1610
1611 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1612 {
1613 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1614
1615 if (local == NULL) {
1616 pr_debug("No such device\n");
1617 return;
1618 }
1619
1620 local_cleanup(local);
1621
1622 nfc_llcp_local_put(local);
1623 }
1624
1625 int __init nfc_llcp_init(void)
1626 {
1627 return nfc_llcp_sock_init();
1628 }
1629
1630 void nfc_llcp_exit(void)
1631 {
1632 nfc_llcp_sock_exit();
1633 }
Linux kernel - Deliverables
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