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NFC: llcp: Aggregated frames support
[deliverable/linux.git] / net / nfc / llcp / llcp.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, write to the
16 * Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
19
20 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
21
22 #include <linux/init.h>
23 #include <linux/kernel.h>
24 #include <linux/list.h>
25 #include <linux/nfc.h>
26
27 #include "../nfc.h"
28 #include "llcp.h"
29
30 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31
32 static struct list_head llcp_devices;
33
34 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
35
36 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
37 {
38 write_lock(&l->lock);
39 sk_add_node(sk, &l->head);
40 write_unlock(&l->lock);
41 }
42
43 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
44 {
45 write_lock(&l->lock);
46 sk_del_node_init(sk);
47 write_unlock(&l->lock);
48 }
49
50 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
51 {
52 struct nfc_llcp_local *local = sock->local;
53 struct sk_buff *s, *tmp;
54
55 pr_debug("%p\n", &sock->sk);
56
57 skb_queue_purge(&sock->tx_queue);
58 skb_queue_purge(&sock->tx_pending_queue);
59
60 if (local == NULL)
61 return;
62
63 /* Search for local pending SKBs that are related to this socket */
64 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
65 if (s->sk != &sock->sk)
66 continue;
67
68 skb_unlink(s, &local->tx_queue);
69 kfree_skb(s);
70 }
71 }
72
73 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen,
74 int err)
75 {
76 struct sock *sk;
77 struct hlist_node *tmp;
78 struct nfc_llcp_sock *llcp_sock;
79
80 skb_queue_purge(&local->tx_queue);
81
82 write_lock(&local->sockets.lock);
83
84 sk_for_each_safe(sk, tmp, &local->sockets.head) {
85 llcp_sock = nfc_llcp_sock(sk);
86
87 bh_lock_sock(sk);
88
89 nfc_llcp_socket_purge(llcp_sock);
90
91 if (sk->sk_state == LLCP_CONNECTED)
92 nfc_put_device(llcp_sock->dev);
93
94 if (sk->sk_state == LLCP_LISTEN) {
95 struct nfc_llcp_sock *lsk, *n;
96 struct sock *accept_sk;
97
98 list_for_each_entry_safe(lsk, n,
99 &llcp_sock->accept_queue,
100 accept_queue) {
101 accept_sk = &lsk->sk;
102 bh_lock_sock(accept_sk);
103
104 nfc_llcp_accept_unlink(accept_sk);
105
106 if (err)
107 accept_sk->sk_err = err;
108 accept_sk->sk_state = LLCP_CLOSED;
109 accept_sk->sk_state_change(sk);
110
111 bh_unlock_sock(accept_sk);
112 }
113
114 if (listen == true) {
115 bh_unlock_sock(sk);
116 continue;
117 }
118 }
119
120 /*
121 * If we have a connection less socket bound, we keep it alive
122 * if the device is still present.
123 */
124 if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM &&
125 listen == true) {
126 bh_unlock_sock(sk);
127 continue;
128 }
129
130 if (err)
131 sk->sk_err = err;
132 sk->sk_state = LLCP_CLOSED;
133 sk->sk_state_change(sk);
134
135 bh_unlock_sock(sk);
136
137 sk_del_node_init(sk);
138 }
139
140 write_unlock(&local->sockets.lock);
141
142 /*
143 * If we want to keep the listening sockets alive,
144 * we don't touch the RAW ones.
145 */
146 if (listen == true)
147 return;
148
149 write_lock(&local->raw_sockets.lock);
150
151 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
152 llcp_sock = nfc_llcp_sock(sk);
153
154 bh_lock_sock(sk);
155
156 nfc_llcp_socket_purge(llcp_sock);
157
158 if (err)
159 sk->sk_err = err;
160 sk->sk_state = LLCP_CLOSED;
161 sk->sk_state_change(sk);
162
163 bh_unlock_sock(sk);
164
165 sk_del_node_init(sk);
166 }
167
168 write_unlock(&local->raw_sockets.lock);
169 }
170
171 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
172 {
173 kref_get(&local->ref);
174
175 return local;
176 }
177
178 static void local_cleanup(struct nfc_llcp_local *local, bool listen)
179 {
180 nfc_llcp_socket_release(local, listen, ENXIO);
181 del_timer_sync(&local->link_timer);
182 skb_queue_purge(&local->tx_queue);
183 cancel_work_sync(&local->tx_work);
184 cancel_work_sync(&local->rx_work);
185 cancel_work_sync(&local->timeout_work);
186 kfree_skb(local->rx_pending);
187 del_timer_sync(&local->sdreq_timer);
188 cancel_work_sync(&local->sdreq_timeout_work);
189 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
190 }
191
192 static void local_release(struct kref *ref)
193 {
194 struct nfc_llcp_local *local;
195
196 local = container_of(ref, struct nfc_llcp_local, ref);
197
198 list_del(&local->list);
199 local_cleanup(local, false);
200 kfree(local);
201 }
202
203 int nfc_llcp_local_put(struct nfc_llcp_local *local)
204 {
205 if (local == NULL)
206 return 0;
207
208 return kref_put(&local->ref, local_release);
209 }
210
211 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
212 u8 ssap, u8 dsap)
213 {
214 struct sock *sk;
215 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
216
217 pr_debug("ssap dsap %d %d\n", ssap, dsap);
218
219 if (ssap == 0 && dsap == 0)
220 return NULL;
221
222 read_lock(&local->sockets.lock);
223
224 llcp_sock = NULL;
225
226 sk_for_each(sk, &local->sockets.head) {
227 tmp_sock = nfc_llcp_sock(sk);
228
229 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
230 llcp_sock = tmp_sock;
231 break;
232 }
233 }
234
235 read_unlock(&local->sockets.lock);
236
237 if (llcp_sock == NULL)
238 return NULL;
239
240 sock_hold(&llcp_sock->sk);
241
242 return llcp_sock;
243 }
244
245 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
246 {
247 sock_put(&sock->sk);
248 }
249
250 static void nfc_llcp_timeout_work(struct work_struct *work)
251 {
252 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
253 timeout_work);
254
255 nfc_dep_link_down(local->dev);
256 }
257
258 static void nfc_llcp_symm_timer(unsigned long data)
259 {
260 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
261
262 pr_err("SYMM timeout\n");
263
264 schedule_work(&local->timeout_work);
265 }
266
267 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
268 {
269 unsigned long time;
270 HLIST_HEAD(nl_sdres_list);
271 struct hlist_node *n;
272 struct nfc_llcp_sdp_tlv *sdp;
273 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
274 sdreq_timeout_work);
275
276 mutex_lock(&local->sdreq_lock);
277
278 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
279
280 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
281 if (time_after(sdp->time, time))
282 continue;
283
284 sdp->sap = LLCP_SDP_UNBOUND;
285
286 hlist_del(&sdp->node);
287
288 hlist_add_head(&sdp->node, &nl_sdres_list);
289 }
290
291 if (!hlist_empty(&local->pending_sdreqs))
292 mod_timer(&local->sdreq_timer,
293 jiffies + msecs_to_jiffies(3 * local->remote_lto));
294
295 mutex_unlock(&local->sdreq_lock);
296
297 if (!hlist_empty(&nl_sdres_list))
298 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
299 }
300
301 static void nfc_llcp_sdreq_timer(unsigned long data)
302 {
303 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
304
305 schedule_work(&local->sdreq_timeout_work);
306 }
307
308 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
309 {
310 struct nfc_llcp_local *local, *n;
311
312 list_for_each_entry_safe(local, n, &llcp_devices, list)
313 if (local->dev == dev)
314 return local;
315
316 pr_debug("No device found\n");
317
318 return NULL;
319 }
320
321 static char *wks[] = {
322 NULL,
323 NULL, /* SDP */
324 "urn:nfc:sn:ip",
325 "urn:nfc:sn:obex",
326 "urn:nfc:sn:snep",
327 };
328
329 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
330 {
331 int sap, num_wks;
332
333 pr_debug("%s\n", service_name);
334
335 if (service_name == NULL)
336 return -EINVAL;
337
338 num_wks = ARRAY_SIZE(wks);
339
340 for (sap = 0; sap < num_wks; sap++) {
341 if (wks[sap] == NULL)
342 continue;
343
344 if (strncmp(wks[sap], service_name, service_name_len) == 0)
345 return sap;
346 }
347
348 return -EINVAL;
349 }
350
351 static
352 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
353 u8 *sn, size_t sn_len)
354 {
355 struct sock *sk;
356 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
357
358 pr_debug("sn %zd %p\n", sn_len, sn);
359
360 if (sn == NULL || sn_len == 0)
361 return NULL;
362
363 read_lock(&local->sockets.lock);
364
365 llcp_sock = NULL;
366
367 sk_for_each(sk, &local->sockets.head) {
368 tmp_sock = nfc_llcp_sock(sk);
369
370 pr_debug("llcp sock %p\n", tmp_sock);
371
372 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
373 tmp_sock->sk.sk_state != LLCP_LISTEN)
374 continue;
375
376 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
377 tmp_sock->sk.sk_state != LLCP_BOUND)
378 continue;
379
380 if (tmp_sock->service_name == NULL ||
381 tmp_sock->service_name_len == 0)
382 continue;
383
384 if (tmp_sock->service_name_len != sn_len)
385 continue;
386
387 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
388 llcp_sock = tmp_sock;
389 break;
390 }
391 }
392
393 read_unlock(&local->sockets.lock);
394
395 pr_debug("Found llcp sock %p\n", llcp_sock);
396
397 return llcp_sock;
398 }
399
400 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
401 struct nfc_llcp_sock *sock)
402 {
403 mutex_lock(&local->sdp_lock);
404
405 if (sock->service_name != NULL && sock->service_name_len > 0) {
406 int ssap = nfc_llcp_wks_sap(sock->service_name,
407 sock->service_name_len);
408
409 if (ssap > 0) {
410 pr_debug("WKS %d\n", ssap);
411
412 /* This is a WKS, let's check if it's free */
413 if (local->local_wks & BIT(ssap)) {
414 mutex_unlock(&local->sdp_lock);
415
416 return LLCP_SAP_MAX;
417 }
418
419 set_bit(ssap, &local->local_wks);
420 mutex_unlock(&local->sdp_lock);
421
422 return ssap;
423 }
424
425 /*
426 * Check if there already is a non WKS socket bound
427 * to this service name.
428 */
429 if (nfc_llcp_sock_from_sn(local, sock->service_name,
430 sock->service_name_len) != NULL) {
431 mutex_unlock(&local->sdp_lock);
432
433 return LLCP_SAP_MAX;
434 }
435
436 mutex_unlock(&local->sdp_lock);
437
438 return LLCP_SDP_UNBOUND;
439
440 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
441 if (!test_bit(sock->ssap, &local->local_wks)) {
442 set_bit(sock->ssap, &local->local_wks);
443 mutex_unlock(&local->sdp_lock);
444
445 return sock->ssap;
446 }
447 }
448
449 mutex_unlock(&local->sdp_lock);
450
451 return LLCP_SAP_MAX;
452 }
453
454 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
455 {
456 u8 local_ssap;
457
458 mutex_lock(&local->sdp_lock);
459
460 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
461 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
462 mutex_unlock(&local->sdp_lock);
463 return LLCP_SAP_MAX;
464 }
465
466 set_bit(local_ssap, &local->local_sap);
467
468 mutex_unlock(&local->sdp_lock);
469
470 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
471 }
472
473 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
474 {
475 u8 local_ssap;
476 unsigned long *sdp;
477
478 if (ssap < LLCP_WKS_NUM_SAP) {
479 local_ssap = ssap;
480 sdp = &local->local_wks;
481 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
482 atomic_t *client_cnt;
483
484 local_ssap = ssap - LLCP_WKS_NUM_SAP;
485 sdp = &local->local_sdp;
486 client_cnt = &local->local_sdp_cnt[local_ssap];
487
488 pr_debug("%d clients\n", atomic_read(client_cnt));
489
490 mutex_lock(&local->sdp_lock);
491
492 if (atomic_dec_and_test(client_cnt)) {
493 struct nfc_llcp_sock *l_sock;
494
495 pr_debug("No more clients for SAP %d\n", ssap);
496
497 clear_bit(local_ssap, sdp);
498
499 /* Find the listening sock and set it back to UNBOUND */
500 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
501 if (l_sock) {
502 l_sock->ssap = LLCP_SDP_UNBOUND;
503 nfc_llcp_sock_put(l_sock);
504 }
505 }
506
507 mutex_unlock(&local->sdp_lock);
508
509 return;
510 } else if (ssap < LLCP_MAX_SAP) {
511 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
512 sdp = &local->local_sap;
513 } else {
514 return;
515 }
516
517 mutex_lock(&local->sdp_lock);
518
519 clear_bit(local_ssap, sdp);
520
521 mutex_unlock(&local->sdp_lock);
522 }
523
524 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
525 {
526 u8 ssap;
527
528 mutex_lock(&local->sdp_lock);
529
530 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
531 if (ssap == LLCP_SDP_NUM_SAP) {
532 mutex_unlock(&local->sdp_lock);
533
534 return LLCP_SAP_MAX;
535 }
536
537 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
538
539 set_bit(ssap, &local->local_sdp);
540
541 mutex_unlock(&local->sdp_lock);
542
543 return LLCP_WKS_NUM_SAP + ssap;
544 }
545
546 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
547 {
548 u8 *gb_cur, *version_tlv, version, version_length;
549 u8 *lto_tlv, lto_length;
550 u8 *wks_tlv, wks_length;
551 u8 *miux_tlv, miux_length;
552 u8 gb_len = 0;
553 int ret = 0;
554
555 version = LLCP_VERSION_11;
556 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
557 1, &version_length);
558 gb_len += version_length;
559
560 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
561 gb_len += lto_length;
562
563 pr_debug("Local wks 0x%lx\n", local->local_wks);
564 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
565 &wks_length);
566 gb_len += wks_length;
567
568 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
569 &miux_length);
570 gb_len += miux_length;
571
572 gb_len += ARRAY_SIZE(llcp_magic);
573
574 if (gb_len > NFC_MAX_GT_LEN) {
575 ret = -EINVAL;
576 goto out;
577 }
578
579 gb_cur = local->gb;
580
581 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
582 gb_cur += ARRAY_SIZE(llcp_magic);
583
584 memcpy(gb_cur, version_tlv, version_length);
585 gb_cur += version_length;
586
587 memcpy(gb_cur, lto_tlv, lto_length);
588 gb_cur += lto_length;
589
590 memcpy(gb_cur, wks_tlv, wks_length);
591 gb_cur += wks_length;
592
593 memcpy(gb_cur, miux_tlv, miux_length);
594 gb_cur += miux_length;
595
596 local->gb_len = gb_len;
597
598 out:
599 kfree(version_tlv);
600 kfree(lto_tlv);
601 kfree(wks_tlv);
602 kfree(miux_tlv);
603
604 return ret;
605 }
606
607 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
608 {
609 struct nfc_llcp_local *local;
610
611 local = nfc_llcp_find_local(dev);
612 if (local == NULL) {
613 *general_bytes_len = 0;
614 return NULL;
615 }
616
617 nfc_llcp_build_gb(local);
618
619 *general_bytes_len = local->gb_len;
620
621 return local->gb;
622 }
623
624 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
625 {
626 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
627
628 if (local == NULL) {
629 pr_err("No LLCP device\n");
630 return -ENODEV;
631 }
632 if (gb_len < 3)
633 return -EINVAL;
634
635 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
636 memcpy(local->remote_gb, gb, gb_len);
637 local->remote_gb_len = gb_len;
638
639 if (memcmp(local->remote_gb, llcp_magic, 3)) {
640 pr_err("MAC does not support LLCP\n");
641 return -EINVAL;
642 }
643
644 return nfc_llcp_parse_gb_tlv(local,
645 &local->remote_gb[3],
646 local->remote_gb_len - 3);
647 }
648
649 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
650 {
651 return (pdu->data[0] & 0xfc) >> 2;
652 }
653
654 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
655 {
656 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
657 }
658
659 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
660 {
661 return pdu->data[1] & 0x3f;
662 }
663
664 static u8 nfc_llcp_ns(struct sk_buff *pdu)
665 {
666 return pdu->data[2] >> 4;
667 }
668
669 static u8 nfc_llcp_nr(struct sk_buff *pdu)
670 {
671 return pdu->data[2] & 0xf;
672 }
673
674 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
675 {
676 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
677 sock->send_n = (sock->send_n + 1) % 16;
678 sock->recv_ack_n = (sock->recv_n - 1) % 16;
679 }
680
681 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
682 struct sk_buff *skb, u8 direction)
683 {
684 struct sk_buff *skb_copy = NULL, *nskb;
685 struct sock *sk;
686 u8 *data;
687
688 read_lock(&local->raw_sockets.lock);
689
690 sk_for_each(sk, &local->raw_sockets.head) {
691 if (sk->sk_state != LLCP_BOUND)
692 continue;
693
694 if (skb_copy == NULL) {
695 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
696 GFP_ATOMIC);
697
698 if (skb_copy == NULL)
699 continue;
700
701 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
702
703 data[0] = local->dev ? local->dev->idx : 0xFF;
704 data[1] = direction;
705 }
706
707 nskb = skb_clone(skb_copy, GFP_ATOMIC);
708 if (!nskb)
709 continue;
710
711 if (sock_queue_rcv_skb(sk, nskb))
712 kfree_skb(nskb);
713 }
714
715 read_unlock(&local->raw_sockets.lock);
716
717 kfree_skb(skb_copy);
718 }
719
720 static void nfc_llcp_tx_work(struct work_struct *work)
721 {
722 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
723 tx_work);
724 struct sk_buff *skb;
725 struct sock *sk;
726 struct nfc_llcp_sock *llcp_sock;
727
728 skb = skb_dequeue(&local->tx_queue);
729 if (skb != NULL) {
730 sk = skb->sk;
731 llcp_sock = nfc_llcp_sock(sk);
732
733 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
734 nfc_llcp_send_symm(local->dev);
735 } else {
736 struct sk_buff *copy_skb = NULL;
737 u8 ptype = nfc_llcp_ptype(skb);
738 int ret;
739
740 pr_debug("Sending pending skb\n");
741 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
742 DUMP_PREFIX_OFFSET, 16, 1,
743 skb->data, skb->len, true);
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_LLCP_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
769 out:
770 mod_timer(&local->link_timer,
771 jiffies + msecs_to_jiffies(2 * local->remote_lto));
772 }
773
774 static 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
793 out:
794 read_unlock(&local->connecting_sockets.lock);
795
796 return llcp_sock;
797 }
798
799 static 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
814 static 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
837 static 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
873 static 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);
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->remote_miu = local->remote_miu;
950 new_sock->nfc_protocol = sock->nfc_protocol;
951 new_sock->dsap = ssap;
952 new_sock->target_idx = local->target_idx;
953 new_sock->parent = parent;
954 new_sock->ssap = sock->ssap;
955 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
956 atomic_t *client_count;
957
958 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
959
960 client_count =
961 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
962
963 atomic_inc(client_count);
964 new_sock->reserved_ssap = sock->ssap;
965 }
966
967 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
968 skb->len - LLCP_HEADER_SIZE);
969
970 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
971
972 nfc_llcp_sock_link(&local->sockets, new_sk);
973
974 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
975
976 nfc_get_device(local->dev->idx);
977
978 new_sk->sk_state = LLCP_CONNECTED;
979
980 /* Wake the listening processes */
981 parent->sk_data_ready(parent, 0);
982
983 /* Send CC */
984 nfc_llcp_send_cc(new_sock);
985
986 release_sock(&sock->sk);
987 sock_put(&sock->sk);
988
989 return;
990
991 fail:
992 /* Send DM */
993 nfc_llcp_send_dm(local, dsap, ssap, reason);
994 }
995
996 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
997 {
998 int nr_frames = 0;
999 struct nfc_llcp_local *local = sock->local;
1000
1001 pr_debug("Remote ready %d tx queue len %d remote rw %d",
1002 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
1003 sock->remote_rw);
1004
1005 /* Try to queue some I frames for transmission */
1006 while (sock->remote_ready &&
1007 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1008 struct sk_buff *pdu;
1009
1010 pdu = skb_dequeue(&sock->tx_queue);
1011 if (pdu == NULL)
1012 break;
1013
1014 /* Update N(S)/N(R) */
1015 nfc_llcp_set_nrns(sock, pdu);
1016
1017 skb_queue_tail(&local->tx_queue, pdu);
1018 nr_frames++;
1019 }
1020
1021 return nr_frames;
1022 }
1023
1024 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1025 struct sk_buff *skb)
1026 {
1027 struct nfc_llcp_sock *llcp_sock;
1028 struct sock *sk;
1029 u8 dsap, ssap, ptype, ns, nr;
1030
1031 ptype = nfc_llcp_ptype(skb);
1032 dsap = nfc_llcp_dsap(skb);
1033 ssap = nfc_llcp_ssap(skb);
1034 ns = nfc_llcp_ns(skb);
1035 nr = nfc_llcp_nr(skb);
1036
1037 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1038
1039 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1040 if (llcp_sock == NULL) {
1041 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1042 return;
1043 }
1044
1045 sk = &llcp_sock->sk;
1046 lock_sock(sk);
1047 if (sk->sk_state == LLCP_CLOSED) {
1048 release_sock(sk);
1049 nfc_llcp_sock_put(llcp_sock);
1050 }
1051
1052 /* Pass the payload upstream */
1053 if (ptype == LLCP_PDU_I) {
1054 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1055
1056 if (ns == llcp_sock->recv_n)
1057 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1058 else
1059 pr_err("Received out of sequence I PDU\n");
1060
1061 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1062 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1063 /*
1064 * I frames will be freed from the socket layer, so we
1065 * need to keep them alive until someone receives them.
1066 */
1067 skb_get(skb);
1068 } else {
1069 pr_err("Receive queue is full\n");
1070 }
1071 }
1072
1073 /* Remove skbs from the pending queue */
1074 if (llcp_sock->send_ack_n != nr) {
1075 struct sk_buff *s, *tmp;
1076 u8 n;
1077
1078 llcp_sock->send_ack_n = nr;
1079
1080 /* Remove and free all skbs until ns == nr */
1081 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1082 n = nfc_llcp_ns(s);
1083
1084 skb_unlink(s, &llcp_sock->tx_pending_queue);
1085 kfree_skb(s);
1086
1087 if (n == nr)
1088 break;
1089 }
1090
1091 /* Re-queue the remaining skbs for transmission */
1092 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1093 s, tmp) {
1094 skb_unlink(s, &llcp_sock->tx_pending_queue);
1095 skb_queue_head(&local->tx_queue, s);
1096 }
1097 }
1098
1099 if (ptype == LLCP_PDU_RR)
1100 llcp_sock->remote_ready = true;
1101 else if (ptype == LLCP_PDU_RNR)
1102 llcp_sock->remote_ready = false;
1103
1104 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1105 nfc_llcp_send_rr(llcp_sock);
1106
1107 release_sock(sk);
1108 nfc_llcp_sock_put(llcp_sock);
1109 }
1110
1111 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1112 struct sk_buff *skb)
1113 {
1114 struct nfc_llcp_sock *llcp_sock;
1115 struct sock *sk;
1116 u8 dsap, ssap;
1117
1118 dsap = nfc_llcp_dsap(skb);
1119 ssap = nfc_llcp_ssap(skb);
1120
1121 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1122 if (llcp_sock == NULL) {
1123 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1124 return;
1125 }
1126
1127 sk = &llcp_sock->sk;
1128 lock_sock(sk);
1129
1130 nfc_llcp_socket_purge(llcp_sock);
1131
1132 if (sk->sk_state == LLCP_CLOSED) {
1133 release_sock(sk);
1134 nfc_llcp_sock_put(llcp_sock);
1135 }
1136
1137 if (sk->sk_state == LLCP_CONNECTED) {
1138 nfc_put_device(local->dev);
1139 sk->sk_state = LLCP_CLOSED;
1140 sk->sk_state_change(sk);
1141 }
1142
1143 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1144
1145 release_sock(sk);
1146 nfc_llcp_sock_put(llcp_sock);
1147 }
1148
1149 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1150 {
1151 struct nfc_llcp_sock *llcp_sock;
1152 struct sock *sk;
1153 u8 dsap, ssap;
1154
1155 dsap = nfc_llcp_dsap(skb);
1156 ssap = nfc_llcp_ssap(skb);
1157
1158 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1159 if (llcp_sock == NULL) {
1160 pr_err("Invalid CC\n");
1161 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1162
1163 return;
1164 }
1165
1166 sk = &llcp_sock->sk;
1167
1168 /* Unlink from connecting and link to the client array */
1169 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1170 nfc_llcp_sock_link(&local->sockets, sk);
1171 llcp_sock->dsap = ssap;
1172
1173 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1174 skb->len - LLCP_HEADER_SIZE);
1175
1176 sk->sk_state = LLCP_CONNECTED;
1177 sk->sk_state_change(sk);
1178
1179 nfc_llcp_sock_put(llcp_sock);
1180 }
1181
1182 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1183 {
1184 struct nfc_llcp_sock *llcp_sock;
1185 struct sock *sk;
1186 u8 dsap, ssap, reason;
1187
1188 dsap = nfc_llcp_dsap(skb);
1189 ssap = nfc_llcp_ssap(skb);
1190 reason = skb->data[2];
1191
1192 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1193
1194 switch (reason) {
1195 case LLCP_DM_NOBOUND:
1196 case LLCP_DM_REJ:
1197 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1198 break;
1199
1200 default:
1201 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1202 break;
1203 }
1204
1205 if (llcp_sock == NULL) {
1206 pr_debug("Already closed\n");
1207 return;
1208 }
1209
1210 sk = &llcp_sock->sk;
1211
1212 sk->sk_err = ENXIO;
1213 sk->sk_state = LLCP_CLOSED;
1214 sk->sk_state_change(sk);
1215
1216 nfc_llcp_sock_put(llcp_sock);
1217 }
1218
1219 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1220 struct sk_buff *skb)
1221 {
1222 struct nfc_llcp_sock *llcp_sock;
1223 u8 dsap, ssap, *tlv, type, length, tid, sap;
1224 u16 tlv_len, offset;
1225 char *service_name;
1226 size_t service_name_len;
1227 struct nfc_llcp_sdp_tlv *sdp;
1228 HLIST_HEAD(llc_sdres_list);
1229 size_t sdres_tlvs_len;
1230 HLIST_HEAD(nl_sdres_list);
1231
1232 dsap = nfc_llcp_dsap(skb);
1233 ssap = nfc_llcp_ssap(skb);
1234
1235 pr_debug("%d %d\n", dsap, ssap);
1236
1237 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1238 pr_err("Wrong SNL SAP\n");
1239 return;
1240 }
1241
1242 tlv = &skb->data[LLCP_HEADER_SIZE];
1243 tlv_len = skb->len - LLCP_HEADER_SIZE;
1244 offset = 0;
1245 sdres_tlvs_len = 0;
1246
1247 while (offset < tlv_len) {
1248 type = tlv[0];
1249 length = tlv[1];
1250
1251 switch (type) {
1252 case LLCP_TLV_SDREQ:
1253 tid = tlv[2];
1254 service_name = (char *) &tlv[3];
1255 service_name_len = length - 1;
1256
1257 pr_debug("Looking for %.16s\n", service_name);
1258
1259 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1260 !strncmp(service_name, "urn:nfc:sn:sdp",
1261 service_name_len)) {
1262 sap = 1;
1263 goto add_snl;
1264 }
1265
1266 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1267 service_name_len);
1268 if (!llcp_sock) {
1269 sap = 0;
1270 goto add_snl;
1271 }
1272
1273 /*
1274 * We found a socket but its ssap has not been reserved
1275 * yet. We need to assign it for good and send a reply.
1276 * The ssap will be freed when the socket is closed.
1277 */
1278 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1279 atomic_t *client_count;
1280
1281 sap = nfc_llcp_reserve_sdp_ssap(local);
1282
1283 pr_debug("Reserving %d\n", sap);
1284
1285 if (sap == LLCP_SAP_MAX) {
1286 sap = 0;
1287 goto add_snl;
1288 }
1289
1290 client_count =
1291 &local->local_sdp_cnt[sap -
1292 LLCP_WKS_NUM_SAP];
1293
1294 atomic_inc(client_count);
1295
1296 llcp_sock->ssap = sap;
1297 llcp_sock->reserved_ssap = sap;
1298 } else {
1299 sap = llcp_sock->ssap;
1300 }
1301
1302 pr_debug("%p %d\n", llcp_sock, sap);
1303
1304 add_snl:
1305 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1306 if (sdp == NULL)
1307 goto exit;
1308
1309 sdres_tlvs_len += sdp->tlv_len;
1310 hlist_add_head(&sdp->node, &llc_sdres_list);
1311 break;
1312
1313 case LLCP_TLV_SDRES:
1314 mutex_lock(&local->sdreq_lock);
1315
1316 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1317
1318 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1319 if (sdp->tid != tlv[2])
1320 continue;
1321
1322 sdp->sap = tlv[3];
1323
1324 pr_debug("Found: uri=%s, sap=%d\n",
1325 sdp->uri, sdp->sap);
1326
1327 hlist_del(&sdp->node);
1328
1329 hlist_add_head(&sdp->node, &nl_sdres_list);
1330
1331 break;
1332 }
1333
1334 mutex_unlock(&local->sdreq_lock);
1335 break;
1336
1337 default:
1338 pr_err("Invalid SNL tlv value 0x%x\n", type);
1339 break;
1340 }
1341
1342 offset += length + 2;
1343 tlv += length + 2;
1344 }
1345
1346 exit:
1347 if (!hlist_empty(&nl_sdres_list))
1348 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1349
1350 if (!hlist_empty(&llc_sdres_list))
1351 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1352 }
1353
1354 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1355 {
1356 u8 ptype;
1357 u16 pdu_len;
1358 struct sk_buff *new_skb;
1359
1360 if (skb->len <= LLCP_HEADER_SIZE) {
1361 pr_err("Malformed AGF PDU\n");
1362 return;
1363 }
1364
1365 skb_pull(skb, LLCP_HEADER_SIZE);
1366
1367 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1368 pdu_len = skb->data[0] << 8 | skb->data[1];
1369
1370 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1371
1372 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1373 pr_err("Malformed AGF PDU\n");
1374 return;
1375 }
1376
1377 ptype = nfc_llcp_ptype(skb);
1378
1379 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1380 goto next;
1381
1382 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1383 if (new_skb == NULL) {
1384 pr_err("Could not allocate PDU\n");
1385 return;
1386 }
1387
1388 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1389
1390 nfc_llcp_rx_skb(local, new_skb);
1391
1392 kfree_skb(new_skb);
1393 next:
1394 skb_pull(skb, pdu_len);
1395 }
1396 }
1397
1398 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1399 {
1400 u8 dsap, ssap, ptype;
1401
1402 ptype = nfc_llcp_ptype(skb);
1403 dsap = nfc_llcp_dsap(skb);
1404 ssap = nfc_llcp_ssap(skb);
1405
1406 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1407
1408 if (ptype != LLCP_PDU_SYMM)
1409 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1410 16, 1, skb->data, skb->len, true);
1411
1412 switch (ptype) {
1413 case LLCP_PDU_SYMM:
1414 pr_debug("SYMM\n");
1415 break;
1416
1417 case LLCP_PDU_UI:
1418 pr_debug("UI\n");
1419 nfc_llcp_recv_ui(local, skb);
1420 break;
1421
1422 case LLCP_PDU_CONNECT:
1423 pr_debug("CONNECT\n");
1424 nfc_llcp_recv_connect(local, skb);
1425 break;
1426
1427 case LLCP_PDU_DISC:
1428 pr_debug("DISC\n");
1429 nfc_llcp_recv_disc(local, skb);
1430 break;
1431
1432 case LLCP_PDU_CC:
1433 pr_debug("CC\n");
1434 nfc_llcp_recv_cc(local, skb);
1435 break;
1436
1437 case LLCP_PDU_DM:
1438 pr_debug("DM\n");
1439 nfc_llcp_recv_dm(local, skb);
1440 break;
1441
1442 case LLCP_PDU_SNL:
1443 pr_debug("SNL\n");
1444 nfc_llcp_recv_snl(local, skb);
1445 break;
1446
1447 case LLCP_PDU_I:
1448 case LLCP_PDU_RR:
1449 case LLCP_PDU_RNR:
1450 pr_debug("I frame\n");
1451 nfc_llcp_recv_hdlc(local, skb);
1452 break;
1453
1454 case LLCP_PDU_AGF:
1455 pr_debug("AGF frame\n");
1456 nfc_llcp_recv_agf(local, skb);
1457 break;
1458 }
1459 }
1460
1461 static void nfc_llcp_rx_work(struct work_struct *work)
1462 {
1463 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1464 rx_work);
1465 struct sk_buff *skb;
1466
1467 skb = local->rx_pending;
1468 if (skb == NULL) {
1469 pr_debug("No pending SKB\n");
1470 return;
1471 }
1472
1473 __net_timestamp(skb);
1474
1475 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1476
1477 nfc_llcp_rx_skb(local, skb);
1478
1479 schedule_work(&local->tx_work);
1480 kfree_skb(local->rx_pending);
1481 local->rx_pending = NULL;
1482 }
1483
1484 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1485 {
1486 local->rx_pending = skb;
1487 del_timer(&local->link_timer);
1488 schedule_work(&local->rx_work);
1489 }
1490
1491 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1492 {
1493 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1494
1495 pr_debug("Received an LLCP PDU\n");
1496 if (err < 0) {
1497 pr_err("err %d\n", err);
1498 return;
1499 }
1500
1501 __nfc_llcp_recv(local, skb);
1502 }
1503
1504 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1505 {
1506 struct nfc_llcp_local *local;
1507
1508 local = nfc_llcp_find_local(dev);
1509 if (local == NULL)
1510 return -ENODEV;
1511
1512 __nfc_llcp_recv(local, skb);
1513
1514 return 0;
1515 }
1516
1517 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1518 {
1519 struct nfc_llcp_local *local;
1520
1521 local = nfc_llcp_find_local(dev);
1522 if (local == NULL)
1523 return;
1524
1525 /* Close and purge all existing sockets */
1526 nfc_llcp_socket_release(local, true, 0);
1527 }
1528
1529 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1530 u8 comm_mode, u8 rf_mode)
1531 {
1532 struct nfc_llcp_local *local;
1533
1534 pr_debug("rf mode %d\n", rf_mode);
1535
1536 local = nfc_llcp_find_local(dev);
1537 if (local == NULL)
1538 return;
1539
1540 local->target_idx = target_idx;
1541 local->comm_mode = comm_mode;
1542 local->rf_mode = rf_mode;
1543
1544 if (rf_mode == NFC_RF_INITIATOR) {
1545 pr_debug("Queueing Tx work\n");
1546
1547 schedule_work(&local->tx_work);
1548 } else {
1549 mod_timer(&local->link_timer,
1550 jiffies + msecs_to_jiffies(local->remote_lto));
1551 }
1552 }
1553
1554 int nfc_llcp_register_device(struct nfc_dev *ndev)
1555 {
1556 struct nfc_llcp_local *local;
1557
1558 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1559 if (local == NULL)
1560 return -ENOMEM;
1561
1562 local->dev = ndev;
1563 INIT_LIST_HEAD(&local->list);
1564 kref_init(&local->ref);
1565 mutex_init(&local->sdp_lock);
1566 init_timer(&local->link_timer);
1567 local->link_timer.data = (unsigned long) local;
1568 local->link_timer.function = nfc_llcp_symm_timer;
1569
1570 skb_queue_head_init(&local->tx_queue);
1571 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1572
1573 local->rx_pending = NULL;
1574 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1575
1576 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1577
1578 rwlock_init(&local->sockets.lock);
1579 rwlock_init(&local->connecting_sockets.lock);
1580 rwlock_init(&local->raw_sockets.lock);
1581
1582 local->lto = 150; /* 1500 ms */
1583 local->rw = LLCP_MAX_RW;
1584 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1585
1586 nfc_llcp_build_gb(local);
1587
1588 local->remote_miu = LLCP_DEFAULT_MIU;
1589 local->remote_lto = LLCP_DEFAULT_LTO;
1590
1591 mutex_init(&local->sdreq_lock);
1592 INIT_HLIST_HEAD(&local->pending_sdreqs);
1593 init_timer(&local->sdreq_timer);
1594 local->sdreq_timer.data = (unsigned long) local;
1595 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1596 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1597
1598 list_add(&local->list, &llcp_devices);
1599
1600 return 0;
1601 }
1602
1603 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1604 {
1605 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1606
1607 if (local == NULL) {
1608 pr_debug("No such device\n");
1609 return;
1610 }
1611
1612 local_cleanup(local, false);
1613
1614 nfc_llcp_local_put(local);
1615 }
1616
1617 int __init nfc_llcp_init(void)
1618 {
1619 INIT_LIST_HEAD(&llcp_devices);
1620
1621 return nfc_llcp_sock_init();
1622 }
1623
1624 void nfc_llcp_exit(void)
1625 {
1626 nfc_llcp_sock_exit();
1627 }
Linux kernel - Deliverables
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