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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge
[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_socket_release(struct nfc_llcp_local *local)
35 {
36 struct nfc_llcp_sock *parent, *s, *n;
37 struct sock *sk, *parent_sk;
38 int i;
39
40 mutex_lock(&local->socket_lock);
41
42 for (i = 0; i < LLCP_MAX_SAP; i++) {
43 parent = local->sockets[i];
44 if (parent == NULL)
45 continue;
46
47 /* Release all child sockets */
48 list_for_each_entry_safe(s, n, &parent->list, list) {
49 list_del_init(&s->list);
50 sk = &s->sk;
51
52 lock_sock(sk);
53
54 if (sk->sk_state == LLCP_CONNECTED)
55 nfc_put_device(s->dev);
56
57 sk->sk_state = LLCP_CLOSED;
58
59 release_sock(sk);
60
61 sock_orphan(sk);
62
63 s->local = NULL;
64 }
65
66 parent_sk = &parent->sk;
67
68 lock_sock(parent_sk);
69
70 if (parent_sk->sk_state == LLCP_LISTEN) {
71 struct nfc_llcp_sock *lsk, *n;
72 struct sock *accept_sk;
73
74 list_for_each_entry_safe(lsk, n, &parent->accept_queue,
75 accept_queue) {
76 accept_sk = &lsk->sk;
77 lock_sock(accept_sk);
78
79 nfc_llcp_accept_unlink(accept_sk);
80
81 accept_sk->sk_state = LLCP_CLOSED;
82
83 release_sock(accept_sk);
84
85 sock_orphan(accept_sk);
86
87 lsk->local = NULL;
88 }
89 }
90
91 if (parent_sk->sk_state == LLCP_CONNECTED)
92 nfc_put_device(parent->dev);
93
94 parent_sk->sk_state = LLCP_CLOSED;
95
96 release_sock(parent_sk);
97
98 sock_orphan(parent_sk);
99
100 parent->local = NULL;
101 }
102
103 mutex_unlock(&local->socket_lock);
104 }
105
106 static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local)
107 {
108 mutex_lock(&local->sdp_lock);
109
110 local->local_wks = 0;
111 local->local_sdp = 0;
112 local->local_sap = 0;
113
114 mutex_unlock(&local->sdp_lock);
115 }
116
117 static void nfc_llcp_timeout_work(struct work_struct *work)
118 {
119 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
120 timeout_work);
121
122 nfc_dep_link_down(local->dev);
123 }
124
125 static void nfc_llcp_symm_timer(unsigned long data)
126 {
127 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
128
129 pr_err("SYMM timeout\n");
130
131 queue_work(local->timeout_wq, &local->timeout_work);
132 }
133
134 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
135 {
136 struct nfc_llcp_local *local, *n;
137
138 list_for_each_entry_safe(local, n, &llcp_devices, list)
139 if (local->dev == dev)
140 return local;
141
142 pr_debug("No device found\n");
143
144 return NULL;
145 }
146
147 static char *wks[] = {
148 NULL,
149 NULL, /* SDP */
150 "urn:nfc:sn:ip",
151 "urn:nfc:sn:obex",
152 "urn:nfc:sn:snep",
153 };
154
155 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
156 {
157 int sap, num_wks;
158
159 pr_debug("%s\n", service_name);
160
161 if (service_name == NULL)
162 return -EINVAL;
163
164 num_wks = ARRAY_SIZE(wks);
165
166 for (sap = 0; sap < num_wks; sap++) {
167 if (wks[sap] == NULL)
168 continue;
169
170 if (strncmp(wks[sap], service_name, service_name_len) == 0)
171 return sap;
172 }
173
174 return -EINVAL;
175 }
176
177 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
178 struct nfc_llcp_sock *sock)
179 {
180 mutex_lock(&local->sdp_lock);
181
182 if (sock->service_name != NULL && sock->service_name_len > 0) {
183 int ssap = nfc_llcp_wks_sap(sock->service_name,
184 sock->service_name_len);
185
186 if (ssap > 0) {
187 pr_debug("WKS %d\n", ssap);
188
189 /* This is a WKS, let's check if it's free */
190 if (local->local_wks & BIT(ssap)) {
191 mutex_unlock(&local->sdp_lock);
192
193 return LLCP_SAP_MAX;
194 }
195
196 set_bit(ssap, &local->local_wks);
197 mutex_unlock(&local->sdp_lock);
198
199 return ssap;
200 }
201
202 /*
203 * This is not a well known service,
204 * we should try to find a local SDP free spot
205 */
206 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
207 if (ssap == LLCP_SDP_NUM_SAP) {
208 mutex_unlock(&local->sdp_lock);
209
210 return LLCP_SAP_MAX;
211 }
212
213 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
214
215 set_bit(ssap, &local->local_sdp);
216 mutex_unlock(&local->sdp_lock);
217
218 return LLCP_WKS_NUM_SAP + ssap;
219
220 } else if (sock->ssap != 0) {
221 if (sock->ssap < LLCP_WKS_NUM_SAP) {
222 if (!test_bit(sock->ssap, &local->local_wks)) {
223 set_bit(sock->ssap, &local->local_wks);
224 mutex_unlock(&local->sdp_lock);
225
226 return sock->ssap;
227 }
228
229 } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
230 if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP,
231 &local->local_sdp)) {
232 set_bit(sock->ssap - LLCP_WKS_NUM_SAP,
233 &local->local_sdp);
234 mutex_unlock(&local->sdp_lock);
235
236 return sock->ssap;
237 }
238 }
239 }
240
241 mutex_unlock(&local->sdp_lock);
242
243 return LLCP_SAP_MAX;
244 }
245
246 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
247 {
248 u8 local_ssap;
249
250 mutex_lock(&local->sdp_lock);
251
252 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
253 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
254 mutex_unlock(&local->sdp_lock);
255 return LLCP_SAP_MAX;
256 }
257
258 set_bit(local_ssap, &local->local_sap);
259
260 mutex_unlock(&local->sdp_lock);
261
262 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
263 }
264
265 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
266 {
267 u8 local_ssap;
268 unsigned long *sdp;
269
270 if (ssap < LLCP_WKS_NUM_SAP) {
271 local_ssap = ssap;
272 sdp = &local->local_wks;
273 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
274 local_ssap = ssap - LLCP_WKS_NUM_SAP;
275 sdp = &local->local_sdp;
276 } else if (ssap < LLCP_MAX_SAP) {
277 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
278 sdp = &local->local_sap;
279 } else {
280 return;
281 }
282
283 mutex_lock(&local->sdp_lock);
284
285 clear_bit(local_ssap, sdp);
286
287 mutex_unlock(&local->sdp_lock);
288 }
289
290 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
291 {
292 struct nfc_llcp_local *local;
293
294 local = nfc_llcp_find_local(dev);
295 if (local == NULL) {
296 *general_bytes_len = 0;
297 return NULL;
298 }
299
300 *general_bytes_len = local->gb_len;
301
302 return local->gb;
303 }
304
305 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
306 {
307 u8 *gb_cur, *version_tlv, version, version_length;
308 u8 *lto_tlv, lto, lto_length;
309 u8 *wks_tlv, wks_length;
310 u8 gb_len = 0;
311
312 version = LLCP_VERSION_11;
313 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
314 1, &version_length);
315 gb_len += version_length;
316
317 /* 1500 ms */
318 lto = 150;
319 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &lto, 1, &lto_length);
320 gb_len += lto_length;
321
322 pr_debug("Local wks 0x%lx\n", local->local_wks);
323 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
324 &wks_length);
325 gb_len += wks_length;
326
327 gb_len += ARRAY_SIZE(llcp_magic);
328
329 if (gb_len > NFC_MAX_GT_LEN) {
330 kfree(version_tlv);
331 return -EINVAL;
332 }
333
334 gb_cur = local->gb;
335
336 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
337 gb_cur += ARRAY_SIZE(llcp_magic);
338
339 memcpy(gb_cur, version_tlv, version_length);
340 gb_cur += version_length;
341
342 memcpy(gb_cur, lto_tlv, lto_length);
343 gb_cur += lto_length;
344
345 memcpy(gb_cur, wks_tlv, wks_length);
346 gb_cur += wks_length;
347
348 kfree(version_tlv);
349 kfree(lto_tlv);
350
351 local->gb_len = gb_len;
352
353 return 0;
354 }
355
356 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
357 {
358 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
359
360 if (local == NULL) {
361 pr_err("No LLCP device\n");
362 return -ENODEV;
363 }
364
365 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
366 memcpy(local->remote_gb, gb, gb_len);
367 local->remote_gb_len = gb_len;
368
369 if (local->remote_gb == NULL || local->remote_gb_len == 0)
370 return -ENODEV;
371
372 if (memcmp(local->remote_gb, llcp_magic, 3)) {
373 pr_err("MAC does not support LLCP\n");
374 return -EINVAL;
375 }
376
377 return nfc_llcp_parse_tlv(local,
378 &local->remote_gb[3],
379 local->remote_gb_len - 3);
380 }
381
382 static void nfc_llcp_tx_work(struct work_struct *work)
383 {
384 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
385 tx_work);
386 struct sk_buff *skb;
387
388 skb = skb_dequeue(&local->tx_queue);
389 if (skb != NULL) {
390 pr_debug("Sending pending skb\n");
391 nfc_data_exchange(local->dev, local->target_idx,
392 skb, nfc_llcp_recv, local);
393 } else {
394 nfc_llcp_send_symm(local->dev);
395 }
396
397 mod_timer(&local->link_timer,
398 jiffies + msecs_to_jiffies(local->remote_lto));
399 }
400
401 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
402 {
403 return (pdu->data[0] & 0xfc) >> 2;
404 }
405
406 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
407 {
408 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
409 }
410
411 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
412 {
413 return pdu->data[1] & 0x3f;
414 }
415
416 static u8 nfc_llcp_ns(struct sk_buff *pdu)
417 {
418 return pdu->data[2] >> 4;
419 }
420
421 static u8 nfc_llcp_nr(struct sk_buff *pdu)
422 {
423 return pdu->data[2] & 0xf;
424 }
425
426 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
427 {
428 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n % 16);
429 sock->send_n = (sock->send_n + 1) % 16;
430 sock->recv_ack_n = (sock->recv_n - 1) % 16;
431 }
432
433 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
434 u8 ssap, u8 dsap)
435 {
436 struct nfc_llcp_sock *sock, *llcp_sock, *n;
437
438 if (ssap == 0 && dsap == 0)
439 return NULL;
440
441 mutex_lock(&local->socket_lock);
442 sock = local->sockets[ssap];
443 if (sock == NULL) {
444 mutex_unlock(&local->socket_lock);
445 return NULL;
446 }
447
448 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
449
450 if (sock->dsap == dsap) {
451 sock_hold(&sock->sk);
452 mutex_unlock(&local->socket_lock);
453 return sock;
454 }
455
456 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
457 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
458 &llcp_sock->sk, llcp_sock->dsap);
459 if (llcp_sock->dsap == dsap) {
460 sock_hold(&llcp_sock->sk);
461 mutex_unlock(&local->socket_lock);
462 return llcp_sock;
463 }
464 }
465
466 pr_err("Could not find socket for %d %d\n", ssap, dsap);
467
468 mutex_unlock(&local->socket_lock);
469
470 return NULL;
471 }
472
473 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
474 {
475 sock_put(&sock->sk);
476 }
477
478 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
479 {
480 u8 *tlv = &skb->data[2], type, length;
481 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
482
483 while (offset < tlv_array_len) {
484 type = tlv[0];
485 length = tlv[1];
486
487 pr_debug("type 0x%x length %d\n", type, length);
488
489 if (type == LLCP_TLV_SN) {
490 *sn_len = length;
491 return &tlv[2];
492 }
493
494 offset += length + 2;
495 tlv += length + 2;
496 }
497
498 return NULL;
499 }
500
501 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
502 struct sk_buff *skb)
503 {
504 struct sock *new_sk, *parent;
505 struct nfc_llcp_sock *sock, *new_sock;
506 u8 dsap, ssap, bound_sap, reason;
507
508 dsap = nfc_llcp_dsap(skb);
509 ssap = nfc_llcp_ssap(skb);
510
511 pr_debug("%d %d\n", dsap, ssap);
512
513 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
514 skb->len - LLCP_HEADER_SIZE);
515
516 if (dsap != LLCP_SAP_SDP) {
517 bound_sap = dsap;
518
519 mutex_lock(&local->socket_lock);
520 sock = local->sockets[dsap];
521 if (sock == NULL) {
522 mutex_unlock(&local->socket_lock);
523 reason = LLCP_DM_NOBOUND;
524 goto fail;
525 }
526
527 sock_hold(&sock->sk);
528 mutex_unlock(&local->socket_lock);
529
530 lock_sock(&sock->sk);
531
532 if (sock->dsap == LLCP_SAP_SDP &&
533 sock->sk.sk_state == LLCP_LISTEN)
534 goto enqueue;
535 } else {
536 u8 *sn;
537 size_t sn_len;
538
539 sn = nfc_llcp_connect_sn(skb, &sn_len);
540 if (sn == NULL) {
541 reason = LLCP_DM_NOBOUND;
542 goto fail;
543 }
544
545 pr_debug("Service name length %zu\n", sn_len);
546
547 mutex_lock(&local->socket_lock);
548 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
549 bound_sap++) {
550 sock = local->sockets[bound_sap];
551 if (sock == NULL)
552 continue;
553
554 if (sock->service_name == NULL ||
555 sock->service_name_len == 0)
556 continue;
557
558 if (sock->service_name_len != sn_len)
559 continue;
560
561 if (sock->dsap == LLCP_SAP_SDP &&
562 sock->sk.sk_state == LLCP_LISTEN &&
563 !memcmp(sn, sock->service_name, sn_len)) {
564 pr_debug("Found service name at SAP %d\n",
565 bound_sap);
566 sock_hold(&sock->sk);
567 mutex_unlock(&local->socket_lock);
568
569 lock_sock(&sock->sk);
570
571 goto enqueue;
572 }
573 }
574 mutex_unlock(&local->socket_lock);
575 }
576
577 reason = LLCP_DM_NOBOUND;
578 goto fail;
579
580 enqueue:
581 parent = &sock->sk;
582
583 if (sk_acceptq_is_full(parent)) {
584 reason = LLCP_DM_REJ;
585 release_sock(&sock->sk);
586 sock_put(&sock->sk);
587 goto fail;
588 }
589
590 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
591 if (new_sk == NULL) {
592 reason = LLCP_DM_REJ;
593 release_sock(&sock->sk);
594 sock_put(&sock->sk);
595 goto fail;
596 }
597
598 new_sock = nfc_llcp_sock(new_sk);
599 new_sock->dev = local->dev;
600 new_sock->local = local;
601 new_sock->nfc_protocol = sock->nfc_protocol;
602 new_sock->ssap = bound_sap;
603 new_sock->dsap = ssap;
604 new_sock->parent = parent;
605
606 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
607
608 list_add_tail(&new_sock->list, &sock->list);
609
610 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
611
612 nfc_get_device(local->dev->idx);
613
614 new_sk->sk_state = LLCP_CONNECTED;
615
616 /* Wake the listening processes */
617 parent->sk_data_ready(parent, 0);
618
619 /* Send CC */
620 nfc_llcp_send_cc(new_sock);
621
622 release_sock(&sock->sk);
623 sock_put(&sock->sk);
624
625 return;
626
627 fail:
628 /* Send DM */
629 nfc_llcp_send_dm(local, dsap, ssap, reason);
630
631 return;
632
633 }
634
635 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
636 {
637 int nr_frames = 0;
638 struct nfc_llcp_local *local = sock->local;
639
640 pr_debug("Remote ready %d tx queue len %d remote rw %d",
641 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
642 local->remote_rw);
643
644 /* Try to queue some I frames for transmission */
645 while (sock->remote_ready &&
646 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
647 struct sk_buff *pdu, *pending_pdu;
648
649 pdu = skb_dequeue(&sock->tx_queue);
650 if (pdu == NULL)
651 break;
652
653 /* Update N(S)/N(R) */
654 nfc_llcp_set_nrns(sock, pdu);
655
656 pending_pdu = skb_clone(pdu, GFP_KERNEL);
657
658 skb_queue_tail(&local->tx_queue, pdu);
659 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
660 nr_frames++;
661 }
662
663 return nr_frames;
664 }
665
666 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
667 struct sk_buff *skb)
668 {
669 struct nfc_llcp_sock *llcp_sock;
670 struct sock *sk;
671 u8 dsap, ssap, ptype, ns, nr;
672
673 ptype = nfc_llcp_ptype(skb);
674 dsap = nfc_llcp_dsap(skb);
675 ssap = nfc_llcp_ssap(skb);
676 ns = nfc_llcp_ns(skb);
677 nr = nfc_llcp_nr(skb);
678
679 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
680
681 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
682 if (llcp_sock == NULL) {
683 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
684 return;
685 }
686
687 sk = &llcp_sock->sk;
688 lock_sock(sk);
689 if (sk->sk_state == LLCP_CLOSED) {
690 release_sock(sk);
691 nfc_llcp_sock_put(llcp_sock);
692 }
693
694 /* Pass the payload upstream */
695 if (ptype == LLCP_PDU_I) {
696 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
697
698 if (ns == llcp_sock->recv_n)
699 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
700 else
701 pr_err("Received out of sequence I PDU\n");
702
703 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
704 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
705 pr_err("receive queue is full\n");
706 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
707 }
708 }
709
710 /* Remove skbs from the pending queue */
711 if (llcp_sock->send_ack_n != nr) {
712 struct sk_buff *s, *tmp;
713
714 llcp_sock->send_ack_n = nr;
715
716 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
717 if (nfc_llcp_ns(s) <= nr) {
718 skb_unlink(s, &llcp_sock->tx_pending_queue);
719 kfree_skb(s);
720 }
721 }
722
723 if (ptype == LLCP_PDU_RR)
724 llcp_sock->remote_ready = true;
725 else if (ptype == LLCP_PDU_RNR)
726 llcp_sock->remote_ready = false;
727
728 if (nfc_llcp_queue_i_frames(llcp_sock) == 0)
729 nfc_llcp_send_rr(llcp_sock);
730
731 release_sock(sk);
732 nfc_llcp_sock_put(llcp_sock);
733 }
734
735 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
736 struct sk_buff *skb)
737 {
738 struct nfc_llcp_sock *llcp_sock;
739 struct sock *sk;
740 u8 dsap, ssap;
741
742 dsap = nfc_llcp_dsap(skb);
743 ssap = nfc_llcp_ssap(skb);
744
745 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
746 if (llcp_sock == NULL) {
747 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
748 return;
749 }
750
751 sk = &llcp_sock->sk;
752 lock_sock(sk);
753 if (sk->sk_state == LLCP_CLOSED) {
754 release_sock(sk);
755 nfc_llcp_sock_put(llcp_sock);
756 }
757
758 if (sk->sk_state == LLCP_CONNECTED) {
759 nfc_put_device(local->dev);
760 sk->sk_state = LLCP_CLOSED;
761 sk->sk_state_change(sk);
762 }
763
764 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
765
766 release_sock(sk);
767 nfc_llcp_sock_put(llcp_sock);
768 }
769
770 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
771 {
772 struct nfc_llcp_sock *llcp_sock;
773 u8 dsap, ssap;
774
775 dsap = nfc_llcp_dsap(skb);
776 ssap = nfc_llcp_ssap(skb);
777
778 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
779
780 if (llcp_sock == NULL)
781 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
782
783 if (llcp_sock == NULL) {
784 pr_err("Invalid CC\n");
785 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
786
787 return;
788 }
789
790 llcp_sock->dsap = ssap;
791
792 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
793 skb->len - LLCP_HEADER_SIZE);
794
795 nfc_llcp_sock_put(llcp_sock);
796 }
797
798 static void nfc_llcp_rx_work(struct work_struct *work)
799 {
800 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
801 rx_work);
802 u8 dsap, ssap, ptype;
803 struct sk_buff *skb;
804
805 skb = local->rx_pending;
806 if (skb == NULL) {
807 pr_debug("No pending SKB\n");
808 return;
809 }
810
811 ptype = nfc_llcp_ptype(skb);
812 dsap = nfc_llcp_dsap(skb);
813 ssap = nfc_llcp_ssap(skb);
814
815 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
816
817 switch (ptype) {
818 case LLCP_PDU_SYMM:
819 pr_debug("SYMM\n");
820 break;
821
822 case LLCP_PDU_CONNECT:
823 pr_debug("CONNECT\n");
824 nfc_llcp_recv_connect(local, skb);
825 break;
826
827 case LLCP_PDU_DISC:
828 pr_debug("DISC\n");
829 nfc_llcp_recv_disc(local, skb);
830 break;
831
832 case LLCP_PDU_CC:
833 pr_debug("CC\n");
834 nfc_llcp_recv_cc(local, skb);
835 break;
836
837 case LLCP_PDU_I:
838 case LLCP_PDU_RR:
839 case LLCP_PDU_RNR:
840 pr_debug("I frame\n");
841 nfc_llcp_recv_hdlc(local, skb);
842 break;
843
844 }
845
846 queue_work(local->tx_wq, &local->tx_work);
847 kfree_skb(local->rx_pending);
848 local->rx_pending = NULL;
849
850 return;
851 }
852
853 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
854 {
855 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
856
857 pr_debug("Received an LLCP PDU\n");
858 if (err < 0) {
859 pr_err("err %d\n", err);
860 return;
861 }
862
863 local->rx_pending = skb_get(skb);
864 del_timer(&local->link_timer);
865 queue_work(local->rx_wq, &local->rx_work);
866
867 return;
868 }
869
870 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
871 {
872 struct nfc_llcp_local *local;
873
874 local = nfc_llcp_find_local(dev);
875 if (local == NULL)
876 return;
877
878 nfc_llcp_clear_sdp(local);
879
880 /* Close and purge all existing sockets */
881 nfc_llcp_socket_release(local);
882 }
883
884 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
885 u8 comm_mode, u8 rf_mode)
886 {
887 struct nfc_llcp_local *local;
888
889 pr_debug("rf mode %d\n", rf_mode);
890
891 local = nfc_llcp_find_local(dev);
892 if (local == NULL)
893 return;
894
895 local->target_idx = target_idx;
896 local->comm_mode = comm_mode;
897 local->rf_mode = rf_mode;
898
899 if (rf_mode == NFC_RF_INITIATOR) {
900 pr_debug("Queueing Tx work\n");
901
902 queue_work(local->tx_wq, &local->tx_work);
903 } else {
904 mod_timer(&local->link_timer,
905 jiffies + msecs_to_jiffies(local->remote_lto));
906 }
907 }
908
909 int nfc_llcp_register_device(struct nfc_dev *ndev)
910 {
911 struct device *dev = &ndev->dev;
912 struct nfc_llcp_local *local;
913 char name[32];
914 int err;
915
916 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
917 if (local == NULL)
918 return -ENOMEM;
919
920 local->dev = ndev;
921 INIT_LIST_HEAD(&local->list);
922 mutex_init(&local->sdp_lock);
923 mutex_init(&local->socket_lock);
924 init_timer(&local->link_timer);
925 local->link_timer.data = (unsigned long) local;
926 local->link_timer.function = nfc_llcp_symm_timer;
927
928 skb_queue_head_init(&local->tx_queue);
929 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
930 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
931 local->tx_wq =
932 alloc_workqueue(name,
933 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
934 1);
935 if (local->tx_wq == NULL) {
936 err = -ENOMEM;
937 goto err_local;
938 }
939
940 local->rx_pending = NULL;
941 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
942 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
943 local->rx_wq =
944 alloc_workqueue(name,
945 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
946 1);
947 if (local->rx_wq == NULL) {
948 err = -ENOMEM;
949 goto err_tx_wq;
950 }
951
952 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
953 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
954 local->timeout_wq =
955 alloc_workqueue(name,
956 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
957 1);
958 if (local->timeout_wq == NULL) {
959 err = -ENOMEM;
960 goto err_rx_wq;
961 }
962
963 nfc_llcp_build_gb(local);
964
965 local->remote_miu = LLCP_DEFAULT_MIU;
966 local->remote_lto = LLCP_DEFAULT_LTO;
967 local->remote_rw = LLCP_DEFAULT_RW;
968
969 list_add(&llcp_devices, &local->list);
970
971 return 0;
972
973 err_rx_wq:
974 destroy_workqueue(local->rx_wq);
975
976 err_tx_wq:
977 destroy_workqueue(local->tx_wq);
978
979 err_local:
980 kfree(local);
981
982 return 0;
983 }
984
985 void nfc_llcp_unregister_device(struct nfc_dev *dev)
986 {
987 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
988
989 if (local == NULL) {
990 pr_debug("No such device\n");
991 return;
992 }
993
994 list_del(&local->list);
995 nfc_llcp_socket_release(local);
996 del_timer_sync(&local->link_timer);
997 skb_queue_purge(&local->tx_queue);
998 destroy_workqueue(local->tx_wq);
999 destroy_workqueue(local->rx_wq);
1000 kfree_skb(local->rx_pending);
1001 kfree(local);
1002 }
1003
1004 int __init nfc_llcp_init(void)
1005 {
1006 INIT_LIST_HEAD(&llcp_devices);
1007
1008 return nfc_llcp_sock_init();
1009 }
1010
1011 void nfc_llcp_exit(void)
1012 {
1013 nfc_llcp_sock_exit();
1014 }
Linux kernel - Deliverables
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