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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
[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 struct 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, *n;
297
298 list_for_each_entry_safe(local, n, &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 = nfc_llcp_find_local(dev);
613
614 if (local == NULL) {
615 pr_err("No LLCP device\n");
616 return -ENODEV;
617 }
618 if (gb_len < 3)
619 return -EINVAL;
620
621 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
622 memcpy(local->remote_gb, gb, gb_len);
623 local->remote_gb_len = gb_len;
624
625 if (memcmp(local->remote_gb, llcp_magic, 3)) {
626 pr_err("MAC does not support LLCP\n");
627 return -EINVAL;
628 }
629
630 return nfc_llcp_parse_gb_tlv(local,
631 &local->remote_gb[3],
632 local->remote_gb_len - 3);
633 }
634
635 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
636 {
637 return (pdu->data[0] & 0xfc) >> 2;
638 }
639
640 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
641 {
642 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
643 }
644
645 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
646 {
647 return pdu->data[1] & 0x3f;
648 }
649
650 static u8 nfc_llcp_ns(struct sk_buff *pdu)
651 {
652 return pdu->data[2] >> 4;
653 }
654
655 static u8 nfc_llcp_nr(struct sk_buff *pdu)
656 {
657 return pdu->data[2] & 0xf;
658 }
659
660 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
661 {
662 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
663 sock->send_n = (sock->send_n + 1) % 16;
664 sock->recv_ack_n = (sock->recv_n - 1) % 16;
665 }
666
667 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
668 struct sk_buff *skb, u8 direction)
669 {
670 struct sk_buff *skb_copy = NULL, *nskb;
671 struct sock *sk;
672 u8 *data;
673
674 read_lock(&local->raw_sockets.lock);
675
676 sk_for_each(sk, &local->raw_sockets.head) {
677 if (sk->sk_state != LLCP_BOUND)
678 continue;
679
680 if (skb_copy == NULL) {
681 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
682 GFP_ATOMIC);
683
684 if (skb_copy == NULL)
685 continue;
686
687 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
688
689 data[0] = local->dev ? local->dev->idx : 0xFF;
690 data[1] = direction;
691 }
692
693 nskb = skb_clone(skb_copy, GFP_ATOMIC);
694 if (!nskb)
695 continue;
696
697 if (sock_queue_rcv_skb(sk, nskb))
698 kfree_skb(nskb);
699 }
700
701 read_unlock(&local->raw_sockets.lock);
702
703 kfree_skb(skb_copy);
704 }
705
706 static void nfc_llcp_tx_work(struct work_struct *work)
707 {
708 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
709 tx_work);
710 struct sk_buff *skb;
711 struct sock *sk;
712 struct nfc_llcp_sock *llcp_sock;
713
714 skb = skb_dequeue(&local->tx_queue);
715 if (skb != NULL) {
716 sk = skb->sk;
717 llcp_sock = nfc_llcp_sock(sk);
718
719 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
720 kfree_skb(skb);
721 nfc_llcp_send_symm(local->dev);
722 } else if (llcp_sock && !llcp_sock->remote_ready) {
723 skb_queue_head(&local->tx_queue, skb);
724 nfc_llcp_send_symm(local->dev);
725 } else {
726 struct sk_buff *copy_skb = NULL;
727 u8 ptype = nfc_llcp_ptype(skb);
728 int ret;
729
730 pr_debug("Sending pending skb\n");
731 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
732 DUMP_PREFIX_OFFSET, 16, 1,
733 skb->data, skb->len, true);
734
735 if (ptype == LLCP_PDU_DISC && sk != NULL &&
736 sk->sk_state == LLCP_DISCONNECTING) {
737 nfc_llcp_sock_unlink(&local->sockets, sk);
738 sock_orphan(sk);
739 sock_put(sk);
740 }
741
742 if (ptype == LLCP_PDU_I)
743 copy_skb = skb_copy(skb, GFP_ATOMIC);
744
745 __net_timestamp(skb);
746
747 nfc_llcp_send_to_raw_sock(local, skb,
748 NFC_LLCP_DIRECTION_TX);
749
750 ret = nfc_data_exchange(local->dev, local->target_idx,
751 skb, nfc_llcp_recv, local);
752
753 if (ret) {
754 kfree_skb(copy_skb);
755 goto out;
756 }
757
758 if (ptype == LLCP_PDU_I && copy_skb)
759 skb_queue_tail(&llcp_sock->tx_pending_queue,
760 copy_skb);
761 }
762 } else {
763 nfc_llcp_send_symm(local->dev);
764 }
765
766 out:
767 mod_timer(&local->link_timer,
768 jiffies + msecs_to_jiffies(2 * local->remote_lto));
769 }
770
771 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
772 u8 ssap)
773 {
774 struct sock *sk;
775 struct nfc_llcp_sock *llcp_sock;
776
777 read_lock(&local->connecting_sockets.lock);
778
779 sk_for_each(sk, &local->connecting_sockets.head) {
780 llcp_sock = nfc_llcp_sock(sk);
781
782 if (llcp_sock->ssap == ssap) {
783 sock_hold(&llcp_sock->sk);
784 goto out;
785 }
786 }
787
788 llcp_sock = NULL;
789
790 out:
791 read_unlock(&local->connecting_sockets.lock);
792
793 return llcp_sock;
794 }
795
796 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
797 u8 *sn, size_t sn_len)
798 {
799 struct nfc_llcp_sock *llcp_sock;
800
801 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
802
803 if (llcp_sock == NULL)
804 return NULL;
805
806 sock_hold(&llcp_sock->sk);
807
808 return llcp_sock;
809 }
810
811 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
812 {
813 u8 *tlv = &skb->data[2], type, length;
814 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
815
816 while (offset < tlv_array_len) {
817 type = tlv[0];
818 length = tlv[1];
819
820 pr_debug("type 0x%x length %d\n", type, length);
821
822 if (type == LLCP_TLV_SN) {
823 *sn_len = length;
824 return &tlv[2];
825 }
826
827 offset += length + 2;
828 tlv += length + 2;
829 }
830
831 return NULL;
832 }
833
834 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
835 struct sk_buff *skb)
836 {
837 struct nfc_llcp_sock *llcp_sock;
838 struct nfc_llcp_ui_cb *ui_cb;
839 u8 dsap, ssap;
840
841 dsap = nfc_llcp_dsap(skb);
842 ssap = nfc_llcp_ssap(skb);
843
844 ui_cb = nfc_llcp_ui_skb_cb(skb);
845 ui_cb->dsap = dsap;
846 ui_cb->ssap = ssap;
847
848 pr_debug("%d %d\n", dsap, ssap);
849
850 /* We're looking for a bound socket, not a client one */
851 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
852 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
853 return;
854
855 /* There is no sequence with UI frames */
856 skb_pull(skb, LLCP_HEADER_SIZE);
857 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
858 /*
859 * UI frames will be freed from the socket layer, so we
860 * need to keep them alive until someone receives them.
861 */
862 skb_get(skb);
863 } else {
864 pr_err("Receive queue is full\n");
865 }
866
867 nfc_llcp_sock_put(llcp_sock);
868 }
869
870 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
871 struct sk_buff *skb)
872 {
873 struct sock *new_sk, *parent;
874 struct nfc_llcp_sock *sock, *new_sock;
875 u8 dsap, ssap, reason;
876
877 dsap = nfc_llcp_dsap(skb);
878 ssap = nfc_llcp_ssap(skb);
879
880 pr_debug("%d %d\n", dsap, ssap);
881
882 if (dsap != LLCP_SAP_SDP) {
883 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
884 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
885 reason = LLCP_DM_NOBOUND;
886 goto fail;
887 }
888 } else {
889 u8 *sn;
890 size_t sn_len;
891
892 sn = nfc_llcp_connect_sn(skb, &sn_len);
893 if (sn == NULL) {
894 reason = LLCP_DM_NOBOUND;
895 goto fail;
896 }
897
898 pr_debug("Service name length %zu\n", sn_len);
899
900 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
901 if (sock == NULL) {
902 reason = LLCP_DM_NOBOUND;
903 goto fail;
904 }
905 }
906
907 lock_sock(&sock->sk);
908
909 parent = &sock->sk;
910
911 if (sk_acceptq_is_full(parent)) {
912 reason = LLCP_DM_REJ;
913 release_sock(&sock->sk);
914 sock_put(&sock->sk);
915 goto fail;
916 }
917
918 if (sock->ssap == LLCP_SDP_UNBOUND) {
919 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
920
921 pr_debug("First client, reserving %d\n", ssap);
922
923 if (ssap == LLCP_SAP_MAX) {
924 reason = LLCP_DM_REJ;
925 release_sock(&sock->sk);
926 sock_put(&sock->sk);
927 goto fail;
928 }
929
930 sock->ssap = ssap;
931 }
932
933 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
934 if (new_sk == NULL) {
935 reason = LLCP_DM_REJ;
936 release_sock(&sock->sk);
937 sock_put(&sock->sk);
938 goto fail;
939 }
940
941 new_sock = nfc_llcp_sock(new_sk);
942 new_sock->dev = local->dev;
943 new_sock->local = nfc_llcp_local_get(local);
944 new_sock->rw = sock->rw;
945 new_sock->miux = sock->miux;
946 new_sock->nfc_protocol = sock->nfc_protocol;
947 new_sock->dsap = ssap;
948 new_sock->target_idx = local->target_idx;
949 new_sock->parent = parent;
950 new_sock->ssap = sock->ssap;
951 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
952 atomic_t *client_count;
953
954 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
955
956 client_count =
957 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
958
959 atomic_inc(client_count);
960 new_sock->reserved_ssap = sock->ssap;
961 }
962
963 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
964 skb->len - LLCP_HEADER_SIZE);
965
966 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
967
968 nfc_llcp_sock_link(&local->sockets, new_sk);
969
970 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
971
972 nfc_get_device(local->dev->idx);
973
974 new_sk->sk_state = LLCP_CONNECTED;
975
976 /* Wake the listening processes */
977 parent->sk_data_ready(parent, 0);
978
979 /* Send CC */
980 nfc_llcp_send_cc(new_sock);
981
982 release_sock(&sock->sk);
983 sock_put(&sock->sk);
984
985 return;
986
987 fail:
988 /* Send DM */
989 nfc_llcp_send_dm(local, dsap, ssap, reason);
990 }
991
992 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
993 {
994 int nr_frames = 0;
995 struct nfc_llcp_local *local = sock->local;
996
997 pr_debug("Remote ready %d tx queue len %d remote rw %d",
998 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
999 sock->remote_rw);
1000
1001 /* Try to queue some I frames for transmission */
1002 while (sock->remote_ready &&
1003 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1004 struct sk_buff *pdu;
1005
1006 pdu = skb_dequeue(&sock->tx_queue);
1007 if (pdu == NULL)
1008 break;
1009
1010 /* Update N(S)/N(R) */
1011 nfc_llcp_set_nrns(sock, pdu);
1012
1013 skb_queue_tail(&local->tx_queue, pdu);
1014 nr_frames++;
1015 }
1016
1017 return nr_frames;
1018 }
1019
1020 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1021 struct sk_buff *skb)
1022 {
1023 struct nfc_llcp_sock *llcp_sock;
1024 struct sock *sk;
1025 u8 dsap, ssap, ptype, ns, nr;
1026
1027 ptype = nfc_llcp_ptype(skb);
1028 dsap = nfc_llcp_dsap(skb);
1029 ssap = nfc_llcp_ssap(skb);
1030 ns = nfc_llcp_ns(skb);
1031 nr = nfc_llcp_nr(skb);
1032
1033 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1034
1035 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1036 if (llcp_sock == NULL) {
1037 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1038 return;
1039 }
1040
1041 sk = &llcp_sock->sk;
1042 lock_sock(sk);
1043 if (sk->sk_state == LLCP_CLOSED) {
1044 release_sock(sk);
1045 nfc_llcp_sock_put(llcp_sock);
1046 }
1047
1048 /* Pass the payload upstream */
1049 if (ptype == LLCP_PDU_I) {
1050 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1051
1052 if (ns == llcp_sock->recv_n)
1053 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1054 else
1055 pr_err("Received out of sequence I PDU\n");
1056
1057 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1058 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1059 /*
1060 * I frames will be freed from the socket layer, so we
1061 * need to keep them alive until someone receives them.
1062 */
1063 skb_get(skb);
1064 } else {
1065 pr_err("Receive queue is full\n");
1066 }
1067 }
1068
1069 /* Remove skbs from the pending queue */
1070 if (llcp_sock->send_ack_n != nr) {
1071 struct sk_buff *s, *tmp;
1072 u8 n;
1073
1074 llcp_sock->send_ack_n = nr;
1075
1076 /* Remove and free all skbs until ns == nr */
1077 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1078 n = nfc_llcp_ns(s);
1079
1080 skb_unlink(s, &llcp_sock->tx_pending_queue);
1081 kfree_skb(s);
1082
1083 if (n == nr)
1084 break;
1085 }
1086
1087 /* Re-queue the remaining skbs for transmission */
1088 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1089 s, tmp) {
1090 skb_unlink(s, &llcp_sock->tx_pending_queue);
1091 skb_queue_head(&local->tx_queue, s);
1092 }
1093 }
1094
1095 if (ptype == LLCP_PDU_RR)
1096 llcp_sock->remote_ready = true;
1097 else if (ptype == LLCP_PDU_RNR)
1098 llcp_sock->remote_ready = false;
1099
1100 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1101 nfc_llcp_send_rr(llcp_sock);
1102
1103 release_sock(sk);
1104 nfc_llcp_sock_put(llcp_sock);
1105 }
1106
1107 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1108 struct sk_buff *skb)
1109 {
1110 struct nfc_llcp_sock *llcp_sock;
1111 struct sock *sk;
1112 u8 dsap, ssap;
1113
1114 dsap = nfc_llcp_dsap(skb);
1115 ssap = nfc_llcp_ssap(skb);
1116
1117 if ((dsap == 0) && (ssap == 0)) {
1118 pr_debug("Connection termination");
1119 nfc_dep_link_down(local->dev);
1120 return;
1121 }
1122
1123 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1124 if (llcp_sock == NULL) {
1125 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1126 return;
1127 }
1128
1129 sk = &llcp_sock->sk;
1130 lock_sock(sk);
1131
1132 nfc_llcp_socket_purge(llcp_sock);
1133
1134 if (sk->sk_state == LLCP_CLOSED) {
1135 release_sock(sk);
1136 nfc_llcp_sock_put(llcp_sock);
1137 }
1138
1139 if (sk->sk_state == LLCP_CONNECTED) {
1140 nfc_put_device(local->dev);
1141 sk->sk_state = LLCP_CLOSED;
1142 sk->sk_state_change(sk);
1143 }
1144
1145 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1146
1147 release_sock(sk);
1148 nfc_llcp_sock_put(llcp_sock);
1149 }
1150
1151 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1152 {
1153 struct nfc_llcp_sock *llcp_sock;
1154 struct sock *sk;
1155 u8 dsap, ssap;
1156
1157 dsap = nfc_llcp_dsap(skb);
1158 ssap = nfc_llcp_ssap(skb);
1159
1160 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1161 if (llcp_sock == NULL) {
1162 pr_err("Invalid CC\n");
1163 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1164
1165 return;
1166 }
1167
1168 sk = &llcp_sock->sk;
1169
1170 /* Unlink from connecting and link to the client array */
1171 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1172 nfc_llcp_sock_link(&local->sockets, sk);
1173 llcp_sock->dsap = ssap;
1174
1175 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1176 skb->len - LLCP_HEADER_SIZE);
1177
1178 sk->sk_state = LLCP_CONNECTED;
1179 sk->sk_state_change(sk);
1180
1181 nfc_llcp_sock_put(llcp_sock);
1182 }
1183
1184 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1185 {
1186 struct nfc_llcp_sock *llcp_sock;
1187 struct sock *sk;
1188 u8 dsap, ssap, reason;
1189
1190 dsap = nfc_llcp_dsap(skb);
1191 ssap = nfc_llcp_ssap(skb);
1192 reason = skb->data[2];
1193
1194 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1195
1196 switch (reason) {
1197 case LLCP_DM_NOBOUND:
1198 case LLCP_DM_REJ:
1199 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1200 break;
1201
1202 default:
1203 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1204 break;
1205 }
1206
1207 if (llcp_sock == NULL) {
1208 pr_debug("Already closed\n");
1209 return;
1210 }
1211
1212 sk = &llcp_sock->sk;
1213
1214 sk->sk_err = ENXIO;
1215 sk->sk_state = LLCP_CLOSED;
1216 sk->sk_state_change(sk);
1217
1218 nfc_llcp_sock_put(llcp_sock);
1219 }
1220
1221 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1222 struct sk_buff *skb)
1223 {
1224 struct nfc_llcp_sock *llcp_sock;
1225 u8 dsap, ssap, *tlv, type, length, tid, sap;
1226 u16 tlv_len, offset;
1227 char *service_name;
1228 size_t service_name_len;
1229 struct nfc_llcp_sdp_tlv *sdp;
1230 HLIST_HEAD(llc_sdres_list);
1231 size_t sdres_tlvs_len;
1232 HLIST_HEAD(nl_sdres_list);
1233
1234 dsap = nfc_llcp_dsap(skb);
1235 ssap = nfc_llcp_ssap(skb);
1236
1237 pr_debug("%d %d\n", dsap, ssap);
1238
1239 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1240 pr_err("Wrong SNL SAP\n");
1241 return;
1242 }
1243
1244 tlv = &skb->data[LLCP_HEADER_SIZE];
1245 tlv_len = skb->len - LLCP_HEADER_SIZE;
1246 offset = 0;
1247 sdres_tlvs_len = 0;
1248
1249 while (offset < tlv_len) {
1250 type = tlv[0];
1251 length = tlv[1];
1252
1253 switch (type) {
1254 case LLCP_TLV_SDREQ:
1255 tid = tlv[2];
1256 service_name = (char *) &tlv[3];
1257 service_name_len = length - 1;
1258
1259 pr_debug("Looking for %.16s\n", service_name);
1260
1261 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1262 !strncmp(service_name, "urn:nfc:sn:sdp",
1263 service_name_len)) {
1264 sap = 1;
1265 goto add_snl;
1266 }
1267
1268 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1269 service_name_len);
1270 if (!llcp_sock) {
1271 sap = 0;
1272 goto add_snl;
1273 }
1274
1275 /*
1276 * We found a socket but its ssap has not been reserved
1277 * yet. We need to assign it for good and send a reply.
1278 * The ssap will be freed when the socket is closed.
1279 */
1280 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1281 atomic_t *client_count;
1282
1283 sap = nfc_llcp_reserve_sdp_ssap(local);
1284
1285 pr_debug("Reserving %d\n", sap);
1286
1287 if (sap == LLCP_SAP_MAX) {
1288 sap = 0;
1289 goto add_snl;
1290 }
1291
1292 client_count =
1293 &local->local_sdp_cnt[sap -
1294 LLCP_WKS_NUM_SAP];
1295
1296 atomic_inc(client_count);
1297
1298 llcp_sock->ssap = sap;
1299 llcp_sock->reserved_ssap = sap;
1300 } else {
1301 sap = llcp_sock->ssap;
1302 }
1303
1304 pr_debug("%p %d\n", llcp_sock, sap);
1305
1306 add_snl:
1307 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1308 if (sdp == NULL)
1309 goto exit;
1310
1311 sdres_tlvs_len += sdp->tlv_len;
1312 hlist_add_head(&sdp->node, &llc_sdres_list);
1313 break;
1314
1315 case LLCP_TLV_SDRES:
1316 mutex_lock(&local->sdreq_lock);
1317
1318 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1319
1320 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1321 if (sdp->tid != tlv[2])
1322 continue;
1323
1324 sdp->sap = tlv[3];
1325
1326 pr_debug("Found: uri=%s, sap=%d\n",
1327 sdp->uri, sdp->sap);
1328
1329 hlist_del(&sdp->node);
1330
1331 hlist_add_head(&sdp->node, &nl_sdres_list);
1332
1333 break;
1334 }
1335
1336 mutex_unlock(&local->sdreq_lock);
1337 break;
1338
1339 default:
1340 pr_err("Invalid SNL tlv value 0x%x\n", type);
1341 break;
1342 }
1343
1344 offset += length + 2;
1345 tlv += length + 2;
1346 }
1347
1348 exit:
1349 if (!hlist_empty(&nl_sdres_list))
1350 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1351
1352 if (!hlist_empty(&llc_sdres_list))
1353 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1354 }
1355
1356 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1357 {
1358 u8 ptype;
1359 u16 pdu_len;
1360 struct sk_buff *new_skb;
1361
1362 if (skb->len <= LLCP_HEADER_SIZE) {
1363 pr_err("Malformed AGF PDU\n");
1364 return;
1365 }
1366
1367 skb_pull(skb, LLCP_HEADER_SIZE);
1368
1369 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1370 pdu_len = skb->data[0] << 8 | skb->data[1];
1371
1372 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1373
1374 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1375 pr_err("Malformed AGF PDU\n");
1376 return;
1377 }
1378
1379 ptype = nfc_llcp_ptype(skb);
1380
1381 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1382 goto next;
1383
1384 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1385 if (new_skb == NULL) {
1386 pr_err("Could not allocate PDU\n");
1387 return;
1388 }
1389
1390 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1391
1392 nfc_llcp_rx_skb(local, new_skb);
1393
1394 kfree_skb(new_skb);
1395 next:
1396 skb_pull(skb, pdu_len);
1397 }
1398 }
1399
1400 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1401 {
1402 u8 dsap, ssap, ptype;
1403
1404 ptype = nfc_llcp_ptype(skb);
1405 dsap = nfc_llcp_dsap(skb);
1406 ssap = nfc_llcp_ssap(skb);
1407
1408 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1409
1410 if (ptype != LLCP_PDU_SYMM)
1411 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1412 16, 1, skb->data, skb->len, true);
1413
1414 switch (ptype) {
1415 case LLCP_PDU_SYMM:
1416 pr_debug("SYMM\n");
1417 break;
1418
1419 case LLCP_PDU_UI:
1420 pr_debug("UI\n");
1421 nfc_llcp_recv_ui(local, skb);
1422 break;
1423
1424 case LLCP_PDU_CONNECT:
1425 pr_debug("CONNECT\n");
1426 nfc_llcp_recv_connect(local, skb);
1427 break;
1428
1429 case LLCP_PDU_DISC:
1430 pr_debug("DISC\n");
1431 nfc_llcp_recv_disc(local, skb);
1432 break;
1433
1434 case LLCP_PDU_CC:
1435 pr_debug("CC\n");
1436 nfc_llcp_recv_cc(local, skb);
1437 break;
1438
1439 case LLCP_PDU_DM:
1440 pr_debug("DM\n");
1441 nfc_llcp_recv_dm(local, skb);
1442 break;
1443
1444 case LLCP_PDU_SNL:
1445 pr_debug("SNL\n");
1446 nfc_llcp_recv_snl(local, skb);
1447 break;
1448
1449 case LLCP_PDU_I:
1450 case LLCP_PDU_RR:
1451 case LLCP_PDU_RNR:
1452 pr_debug("I frame\n");
1453 nfc_llcp_recv_hdlc(local, skb);
1454 break;
1455
1456 case LLCP_PDU_AGF:
1457 pr_debug("AGF frame\n");
1458 nfc_llcp_recv_agf(local, skb);
1459 break;
1460 }
1461 }
1462
1463 static void nfc_llcp_rx_work(struct work_struct *work)
1464 {
1465 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1466 rx_work);
1467 struct sk_buff *skb;
1468
1469 skb = local->rx_pending;
1470 if (skb == NULL) {
1471 pr_debug("No pending SKB\n");
1472 return;
1473 }
1474
1475 __net_timestamp(skb);
1476
1477 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1478
1479 nfc_llcp_rx_skb(local, skb);
1480
1481 schedule_work(&local->tx_work);
1482 kfree_skb(local->rx_pending);
1483 local->rx_pending = NULL;
1484 }
1485
1486 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1487 {
1488 local->rx_pending = skb;
1489 del_timer(&local->link_timer);
1490 schedule_work(&local->rx_work);
1491 }
1492
1493 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1494 {
1495 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1496
1497 pr_debug("Received an LLCP PDU\n");
1498 if (err < 0) {
1499 pr_err("err %d\n", err);
1500 return;
1501 }
1502
1503 __nfc_llcp_recv(local, skb);
1504 }
1505
1506 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1507 {
1508 struct nfc_llcp_local *local;
1509
1510 local = nfc_llcp_find_local(dev);
1511 if (local == NULL)
1512 return -ENODEV;
1513
1514 __nfc_llcp_recv(local, skb);
1515
1516 return 0;
1517 }
1518
1519 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1520 {
1521 struct nfc_llcp_local *local;
1522
1523 local = nfc_llcp_find_local(dev);
1524 if (local == NULL)
1525 return;
1526
1527 local->remote_miu = LLCP_DEFAULT_MIU;
1528 local->remote_lto = LLCP_DEFAULT_LTO;
1529
1530 /* Close and purge all existing sockets */
1531 nfc_llcp_socket_release(local, true, 0);
1532 }
1533
1534 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1535 u8 comm_mode, u8 rf_mode)
1536 {
1537 struct nfc_llcp_local *local;
1538
1539 pr_debug("rf mode %d\n", rf_mode);
1540
1541 local = nfc_llcp_find_local(dev);
1542 if (local == NULL)
1543 return;
1544
1545 local->target_idx = target_idx;
1546 local->comm_mode = comm_mode;
1547 local->rf_mode = rf_mode;
1548
1549 if (rf_mode == NFC_RF_INITIATOR) {
1550 pr_debug("Queueing Tx work\n");
1551
1552 schedule_work(&local->tx_work);
1553 } else {
1554 mod_timer(&local->link_timer,
1555 jiffies + msecs_to_jiffies(local->remote_lto));
1556 }
1557 }
1558
1559 int nfc_llcp_register_device(struct nfc_dev *ndev)
1560 {
1561 struct nfc_llcp_local *local;
1562
1563 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1564 if (local == NULL)
1565 return -ENOMEM;
1566
1567 local->dev = ndev;
1568 INIT_LIST_HEAD(&local->list);
1569 kref_init(&local->ref);
1570 mutex_init(&local->sdp_lock);
1571 init_timer(&local->link_timer);
1572 local->link_timer.data = (unsigned long) local;
1573 local->link_timer.function = nfc_llcp_symm_timer;
1574
1575 skb_queue_head_init(&local->tx_queue);
1576 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1577
1578 local->rx_pending = NULL;
1579 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1580
1581 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1582
1583 rwlock_init(&local->sockets.lock);
1584 rwlock_init(&local->connecting_sockets.lock);
1585 rwlock_init(&local->raw_sockets.lock);
1586
1587 local->lto = 150; /* 1500 ms */
1588 local->rw = LLCP_MAX_RW;
1589 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1590 local->local_wks = 0x1; /* LLC Link Management */
1591
1592 nfc_llcp_build_gb(local);
1593
1594 local->remote_miu = LLCP_DEFAULT_MIU;
1595 local->remote_lto = LLCP_DEFAULT_LTO;
1596
1597 mutex_init(&local->sdreq_lock);
1598 INIT_HLIST_HEAD(&local->pending_sdreqs);
1599 init_timer(&local->sdreq_timer);
1600 local->sdreq_timer.data = (unsigned long) local;
1601 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1602 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1603
1604 list_add(&local->list, &llcp_devices);
1605
1606 return 0;
1607 }
1608
1609 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1610 {
1611 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1612
1613 if (local == NULL) {
1614 pr_debug("No such device\n");
1615 return;
1616 }
1617
1618 local_cleanup(local);
1619
1620 nfc_llcp_local_put(local);
1621 }
1622
1623 int __init nfc_llcp_init(void)
1624 {
1625 INIT_LIST_HEAD(&llcp_devices);
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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