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NFC: Set the right LLCP N(R) value for I frames
[deliverable/linux.git] / net / nfc / llcp / llcp.c
CommitLineData
d646960f
SO		 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
30static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
31
32static struct list_head llcp_devices;
33
34static 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
41 mutex_lock(&local->socket_lock);
42
43 for (i = 0; i < LLCP_MAX_SAP; i++) {
44 parent = local->sockets[i];
45 if (parent == NULL)
46 continue;
47
48 /* Release all child sockets */
49 list_for_each_entry_safe(s, n, &parent->list, list) {
50 list_del(&s->list);
51 sk = &s->sk;
52
53 lock_sock(sk);
54
55 if (sk->sk_state == LLCP_CONNECTED)
56 nfc_put_device(s->dev);
57
58 sk->sk_state = LLCP_CLOSED;
59 sock_set_flag(sk, SOCK_DEAD);
60
61 release_sock(sk);
62 }
63
64 parent_sk = &parent->sk;
65
66 lock_sock(parent_sk);
67
68 if (parent_sk->sk_state == LLCP_LISTEN) {
69 struct nfc_llcp_sock *lsk, *n;
70 struct sock *accept_sk;
71
72 list_for_each_entry_safe(lsk, n, &parent->accept_queue,
73 accept_queue) {
74 accept_sk = &lsk->sk;
75 lock_sock(accept_sk);
76
77 nfc_llcp_accept_unlink(accept_sk);
78
79 accept_sk->sk_state = LLCP_CLOSED;
80 sock_set_flag(accept_sk, SOCK_DEAD);
81
82 release_sock(accept_sk);
83
84 sock_orphan(accept_sk);
85 }
86 }
87
88 if (parent_sk->sk_state == LLCP_CONNECTED)
89 nfc_put_device(parent->dev);
90
91 parent_sk->sk_state = LLCP_CLOSED;
92 sock_set_flag(parent_sk, SOCK_DEAD);
93
94 release_sock(parent_sk);
95 }
96
97 mutex_unlock(&local->socket_lock);
98}
99
b9a76f1d
SO		 100static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local)
101{
102 mutex_lock(&local->sdp_lock);
103
104 local->local_wks = 0;
105 local->local_sdp = 0;
106 local->local_sap = 0;
107
108 mutex_unlock(&local->sdp_lock);
109}
110
d646960f
SO		 111static void nfc_llcp_timeout_work(struct work_struct *work)
112{
113 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
114 timeout_work);
115
116 nfc_dep_link_down(local->dev);
117}
118
119static void nfc_llcp_symm_timer(unsigned long data)
120{
121 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
122
123 pr_err("SYMM timeout\n");
124
125 queue_work(local->timeout_wq, &local->timeout_work);
126}
127
128struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
129{
130 struct nfc_llcp_local *local, *n;
131
132 list_for_each_entry_safe(local, n, &llcp_devices, list)
133 if (local->dev == dev)
134 return local;
135
136 pr_debug("No device found\n");
137
138 return NULL;
139}
140
141static char *wks[] = {
142 NULL,
143 NULL, /* SDP */
144 "urn:nfc:sn:ip",
145 "urn:nfc:sn:obex",
146 "urn:nfc:sn:snep",
147};
148
149static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
150{
151 int sap, num_wks;
152
153 pr_debug("%s\n", service_name);
154
155 if (service_name == NULL)
156 return -EINVAL;
157
158 num_wks = ARRAY_SIZE(wks);
159
160 for (sap = 0 ; sap < num_wks; sap++) {
161 if (wks[sap] == NULL)
162 continue;
163
164 if (strncmp(wks[sap], service_name, service_name_len) == 0)
165 return sap;
166 }
167
168 return -EINVAL;
169}
170
171u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
172 struct nfc_llcp_sock *sock)
173{
174 mutex_lock(&local->sdp_lock);
175
176 if (sock->service_name != NULL && sock->service_name_len > 0) {
177 int ssap = nfc_llcp_wks_sap(sock->service_name,
178 sock->service_name_len);
179
180 if (ssap > 0) {
181 pr_debug("WKS %d\n", ssap);
182
183 /* This is a WKS, let's check if it's free */
184 if (local->local_wks & BIT(ssap)) {
185 mutex_unlock(&local->sdp_lock);
186
187 return LLCP_SAP_MAX;
188 }
189
1762c17c 190 set_bit(ssap, &local->local_wks);
d646960f
SO		 191 mutex_unlock(&local->sdp_lock);
192
193 return ssap;
194 }
195
196 /*
197 * This is not a well known service,
198 * we should try to find a local SDP free spot
199 */
200 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
201 if (ssap == LLCP_SDP_NUM_SAP) {
202 mutex_unlock(&local->sdp_lock);
203
204 return LLCP_SAP_MAX;
205 }
206
207 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
208
1762c17c 209 set_bit(ssap, &local->local_sdp);
d646960f
SO		 210 mutex_unlock(&local->sdp_lock);
211
212 return LLCP_WKS_NUM_SAP + ssap;
213
214 } else if (sock->ssap != 0) {
215 if (sock->ssap < LLCP_WKS_NUM_SAP) {
1762c17c
SO		 216 if (!test_bit(sock->ssap, &local->local_wks)) {
217 set_bit(sock->ssap, &local->local_wks);
d646960f
SO		 218 mutex_unlock(&local->sdp_lock);
219
220 return sock->ssap;
221 }
222
223 } else if (sock->ssap < LLCP_SDP_NUM_SAP) {
1762c17c
SO		 224 if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP,
225 &local->local_sdp)) {
226 set_bit(sock->ssap - LLCP_WKS_NUM_SAP,
227 &local->local_sdp);
d646960f
SO		 228 mutex_unlock(&local->sdp_lock);
229
230 return sock->ssap;
231 }
232 }
233 }
234
235 mutex_unlock(&local->sdp_lock);
236
237 return LLCP_SAP_MAX;
238}
239
240u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
241{
242 u8 local_ssap;
243
244 mutex_lock(&local->sdp_lock);
245
246 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
247 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
248 mutex_unlock(&local->sdp_lock);
249 return LLCP_SAP_MAX;
250 }
251
1762c17c 252 set_bit(local_ssap, &local->local_sap);
d646960f
SO		 253
254 mutex_unlock(&local->sdp_lock);
255
256 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
257}
258
259void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
260{
261 u8 local_ssap;
262 unsigned long *sdp;
263
264 if (ssap < LLCP_WKS_NUM_SAP) {
265 local_ssap = ssap;
266 sdp = &local->local_wks;
267 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
268 local_ssap = ssap - LLCP_WKS_NUM_SAP;
269 sdp = &local->local_sdp;
270 } else if (ssap < LLCP_MAX_SAP) {
271 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
272 sdp = &local->local_sap;
273 } else {
274 return;
275 }
276
277 mutex_lock(&local->sdp_lock);
278
1762c17c 279 clear_bit(local_ssap, sdp);
d646960f
SO		 280
281 mutex_unlock(&local->sdp_lock);
282}
283
284u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, u8 *general_bytes_len)
285{
286 struct nfc_llcp_local *local;
287
288 local = nfc_llcp_find_local(dev);
289 if (local == NULL) {
290 *general_bytes_len = 0;
291 return NULL;
292 }
293
294 *general_bytes_len = local->gb_len;
295
296 return local->gb;
297}
298
299static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
300{
301 u8 *gb_cur, *version_tlv, version, version_length;
302 u8 *lto_tlv, lto, lto_length;
303 u8 *wks_tlv, wks_length;
304 u8 gb_len = 0;
305
306 version = LLCP_VERSION_11;
307 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
308 1, &version_length);
309 gb_len += version_length;
310
311 /* 1500 ms */
312 lto = 150;
313 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &lto, 1, &lto_length);
314 gb_len += lto_length;
315
316 pr_debug("Local wks 0x%lx\n", local->local_wks);
317 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
318 &wks_length);
319 gb_len += wks_length;
320
321 gb_len += ARRAY_SIZE(llcp_magic);
322
323 if (gb_len > NFC_MAX_GT_LEN) {
324 kfree(version_tlv);
325 return -EINVAL;
326 }
327
328 gb_cur = local->gb;
329
330 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
331 gb_cur += ARRAY_SIZE(llcp_magic);
332
333 memcpy(gb_cur, version_tlv, version_length);
334 gb_cur += version_length;
335
336 memcpy(gb_cur, lto_tlv, lto_length);
337 gb_cur += lto_length;
338
339 memcpy(gb_cur, wks_tlv, wks_length);
340 gb_cur += wks_length;
341
342 kfree(version_tlv);
343 kfree(lto_tlv);
344
345 local->gb_len = gb_len;
346
347 return 0;
348}
349
350int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
351{
352 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
353
354 if (local == NULL) {
355 pr_err("No LLCP device\n");
356 return -ENODEV;
357 }
358
359 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
360 memcpy(local->remote_gb, gb, gb_len);
361 local->remote_gb_len = gb_len;
362
363 if (local->remote_gb == NULL ||
364 local->remote_gb_len == 0)
365 return -ENODEV;
366
367 if (memcmp(local->remote_gb, llcp_magic, 3)) {
368 pr_err("MAC does not support LLCP\n");
369 return -EINVAL;
370 }
371
372 return nfc_llcp_parse_tlv(local,
373 &local->remote_gb[3], local->remote_gb_len - 3);
374}
375
376static void nfc_llcp_tx_work(struct work_struct *work)
377{
378 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
379 tx_work);
380 struct sk_buff *skb;
381
382 skb = skb_dequeue(&local->tx_queue);
383 if (skb != NULL) {
384 pr_debug("Sending pending skb\n");
385 nfc_data_exchange(local->dev, local->target_idx,
386 skb, nfc_llcp_recv, local);
387 } else {
388 nfc_llcp_send_symm(local->dev);
389 }
390
391 mod_timer(&local->link_timer,
392 jiffies + msecs_to_jiffies(local->remote_lto));
393}
394
395static u8 nfc_llcp_dsap(struct sk_buff *pdu)
396{
397 return (pdu->data[0] & 0xfc) >> 2;
398}
399
400static u8 nfc_llcp_ptype(struct sk_buff *pdu)
401{
402 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
403}
404
405static u8 nfc_llcp_ssap(struct sk_buff *pdu)
406{
407 return pdu->data[1] & 0x3f;
408}
409
410static u8 nfc_llcp_ns(struct sk_buff *pdu)
411{
412 return pdu->data[2] >> 4;
413}
414
415static u8 nfc_llcp_nr(struct sk_buff *pdu)
416{
417 return pdu->data[2] & 0xf;
418}
419
420static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
421{
0767a7fa 422 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n % 16);
d646960f
SO		 423 sock->send_n = (sock->send_n + 1) % 16;
424 sock->recv_ack_n = (sock->recv_n - 1) % 16;
425}
426
427static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
428 u8 ssap, u8 dsap)
429{
430 struct nfc_llcp_sock *sock, *llcp_sock, *n;
431
432 if (ssap == 0 && dsap == 0)
433 return NULL;
434
435 mutex_lock(&local->socket_lock);
436 sock = local->sockets[ssap];
437 if (sock == NULL) {
438 mutex_unlock(&local->socket_lock);
439 return NULL;
440 }
441
442 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
443
444 if (sock->dsap == dsap) {
445 sock_hold(&sock->sk);
446 mutex_unlock(&local->socket_lock);
447 return sock;
448 }
449
450 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
451 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
452 &llcp_sock->sk, llcp_sock->dsap);
453 if (llcp_sock->dsap == dsap) {
454 sock_hold(&llcp_sock->sk);
455 mutex_unlock(&local->socket_lock);
456 return llcp_sock;
457 }
458 }
459
460 pr_err("Could not find socket for %d %d\n", ssap, dsap);
461
462 mutex_unlock(&local->socket_lock);
463
464 return NULL;
465}
466
467static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
468{
469 sock_put(&sock->sk);
470}
471
472static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
473{
474 u8 *tlv = &skb->data[2], type, length;
475 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
476
477 while (offset < tlv_array_len) {
478 type = tlv[0];
479 length = tlv[1];
480
481 pr_debug("type 0x%x length %d\n", type, length);
482
483 if (type == LLCP_TLV_SN) {
484 *sn_len = length;
485 return &tlv[2];
486 }
487
488 offset += length + 2;
489 tlv += length + 2;
490 }
491
492 return NULL;
493}
494
495static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
496 struct sk_buff *skb)
497{
498 struct sock *new_sk, *parent;
499 struct nfc_llcp_sock *sock, *new_sock;
500 u8 dsap, ssap, bound_sap, reason;
501
502 dsap = nfc_llcp_dsap(skb);
503 ssap = nfc_llcp_ssap(skb);
504
505 pr_debug("%d %d\n", dsap, ssap);
506
507 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
508 skb->len - LLCP_HEADER_SIZE);
509
510 if (dsap != LLCP_SAP_SDP) {
511 bound_sap = dsap;
512
513 mutex_lock(&local->socket_lock);
514 sock = local->sockets[dsap];
515 if (sock == NULL) {
516 mutex_unlock(&local->socket_lock);
517 reason = LLCP_DM_NOBOUND;
518 goto fail;
519 }
520
521 sock_hold(&sock->sk);
522 mutex_unlock(&local->socket_lock);
523
524 lock_sock(&sock->sk);
525
526 if (sock->dsap == LLCP_SAP_SDP &&
527 sock->sk.sk_state == LLCP_LISTEN)
528 goto enqueue;
529 } else {
530 u8 *sn;
531 size_t sn_len;
532
533 sn = nfc_llcp_connect_sn(skb, &sn_len);
534 if (sn == NULL) {
535 reason = LLCP_DM_NOBOUND;
536 goto fail;
537 }
538
539 pr_debug("Service name length %zu\n", sn_len);
540
541 mutex_lock(&local->socket_lock);
542 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
543 bound_sap++) {
544 sock = local->sockets[bound_sap];
545 if (sock == NULL)
546 continue;
547
548 if (sock->service_name == NULL ||
549 sock->service_name_len == 0)
550 continue;
551
552 if (sock->service_name_len != sn_len)
553 continue;
554
555 if (sock->dsap == LLCP_SAP_SDP &&
556 sock->sk.sk_state == LLCP_LISTEN &&
557 !memcmp(sn, sock->service_name, sn_len)) {
558 pr_debug("Found service name at SAP %d\n",
559 bound_sap);
560 sock_hold(&sock->sk);
561 mutex_unlock(&local->socket_lock);
562
563 lock_sock(&sock->sk);
564
565 goto enqueue;
566 }
567 }
341ee434 568 mutex_unlock(&local->socket_lock);
d646960f
SO		 569 }
570
d646960f
SO		 571 reason = LLCP_DM_NOBOUND;
572 goto fail;
573
574enqueue:
575 parent = &sock->sk;
576
577 if (sk_acceptq_is_full(parent)) {
578 reason = LLCP_DM_REJ;
579 release_sock(&sock->sk);
580 sock_put(&sock->sk);
581 goto fail;
582 }
583
584 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type,
585 GFP_ATOMIC);
586 if (new_sk == NULL) {
587 reason = LLCP_DM_REJ;
588 release_sock(&sock->sk);
589 sock_put(&sock->sk);
590 goto fail;
591 }
592
593 new_sock = nfc_llcp_sock(new_sk);
594 new_sock->dev = local->dev;
595 new_sock->local = local;
596 new_sock->nfc_protocol = sock->nfc_protocol;
597 new_sock->ssap = bound_sap;
598 new_sock->dsap = ssap;
599 new_sock->parent = parent;
600
601 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
602
603 list_add_tail(&new_sock->list, &sock->list);
604
605 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
606
607 nfc_get_device(local->dev->idx);
608
609 new_sk->sk_state = LLCP_CONNECTED;
610
611 /* Wake the listening processes */
612 parent->sk_data_ready(parent, 0);
613
614 /* Send CC */
615 nfc_llcp_send_cc(new_sock);
616
617 release_sock(&sock->sk);
618 sock_put(&sock->sk);
619
620 return;
621
622fail:
623 /* Send DM */
624 nfc_llcp_send_dm(local, dsap, ssap, reason);
625
626 return;
627
628}
629
4722d2b7
SO		 630void nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
631{
632 struct nfc_llcp_local *local = sock->local;
633
634 pr_debug("Remote ready %d tx queue len %d remote rw %d",
635 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
636 local->remote_rw);
637
638 /* Try to queue some I frames for transmission */
639 while (sock->remote_ready &&
640 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
641 struct sk_buff *pdu, *pending_pdu;
642
643 pdu = skb_dequeue(&sock->tx_queue);
644 if (pdu == NULL)
645 break;
646
647 /* Update N(S)/N(R) */
648 nfc_llcp_set_nrns(sock, pdu);
649
650 pending_pdu = skb_clone(pdu, GFP_KERNEL);
651
652 skb_queue_tail(&local->tx_queue, pdu);
653 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
654 }
655}
656
d646960f
SO		 657static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
658 struct sk_buff *skb)
659{
660 struct nfc_llcp_sock *llcp_sock;
661 struct sock *sk;
662 u8 dsap, ssap, ptype, ns, nr;
663
664 ptype = nfc_llcp_ptype(skb);
665 dsap = nfc_llcp_dsap(skb);
666 ssap = nfc_llcp_ssap(skb);
667 ns = nfc_llcp_ns(skb);
668 nr = nfc_llcp_nr(skb);
669
670 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
671
672 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
673 if (llcp_sock == NULL) {
674 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
675 return;
676 }
677
678 sk = &llcp_sock->sk;
679 lock_sock(sk);
680 if (sk->sk_state == LLCP_CLOSED) {
681 release_sock(sk);
682 nfc_llcp_sock_put(llcp_sock);
683 }
684
d646960f
SO		 685 /* Pass the payload upstream */
686 if (ptype == LLCP_PDU_I) {
687 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
688
53aef920
SO		 689 if (ns == llcp_sock->recv_n)
690 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
691 else
692 pr_err("Received out of sequence I PDU\n");
693
d646960f
SO		 694 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
695 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
696 pr_err("receive queue is full\n");
697 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
698 }
699 }
700
701 /* Remove skbs from the pending queue */
702 if (llcp_sock->send_ack_n != nr) {
703 struct sk_buff *s, *tmp;
704
705 llcp_sock->send_ack_n = nr;
706
707 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
708 if (nfc_llcp_ns(s) <= nr) {
709 skb_unlink(s, &llcp_sock->tx_pending_queue);
710 kfree_skb(s);
711 }
712 }
713
53aef920
SO		 714 if (ptype == LLCP_PDU_RR)
715 llcp_sock->remote_ready = true;
716 else if (ptype == LLCP_PDU_RNR)
717 llcp_sock->remote_ready = false;
718
4722d2b7 719 nfc_llcp_queue_i_frames(llcp_sock);
d646960f
SO		 720
721 release_sock(sk);
722 nfc_llcp_sock_put(llcp_sock);
723}
724
725static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
726 struct sk_buff *skb)
727{
728 struct nfc_llcp_sock *llcp_sock;
729 struct sock *sk;
730 u8 dsap, ssap;
731
732 dsap = nfc_llcp_dsap(skb);
733 ssap = nfc_llcp_ssap(skb);
734
735 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
736 if (llcp_sock == NULL) {
737 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
738 return;
739 }
740
741 sk = &llcp_sock->sk;
742 lock_sock(sk);
743 if (sk->sk_state == LLCP_CLOSED) {
744 release_sock(sk);
745 nfc_llcp_sock_put(llcp_sock);
746 }
747
748
749 if (sk->sk_state == LLCP_CONNECTED) {
750 nfc_put_device(local->dev);
751 sk->sk_state = LLCP_CLOSED;
752 sk->sk_state_change(sk);
753 }
754
755 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
756
757 release_sock(sk);
758 nfc_llcp_sock_put(llcp_sock);
759}
760
761static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
762 struct sk_buff *skb)
763{
764 struct nfc_llcp_sock *llcp_sock;
765 u8 dsap, ssap;
766
767
768 dsap = nfc_llcp_dsap(skb);
769 ssap = nfc_llcp_ssap(skb);
770
771 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
772
773 if (llcp_sock == NULL)
774 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
775
776 if (llcp_sock == NULL) {
777 pr_err("Invalid CC\n");
778 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
779
780 return;
781 }
782
783 llcp_sock->dsap = ssap;
784
785 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
786 skb->len - LLCP_HEADER_SIZE);
787
788 nfc_llcp_sock_put(llcp_sock);
789}
790
791static void nfc_llcp_rx_work(struct work_struct *work)
792{
793 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
794 rx_work);
795 u8 dsap, ssap, ptype;
796 struct sk_buff *skb;
797
798 skb = local->rx_pending;
799 if (skb == NULL) {
800 pr_debug("No pending SKB\n");
801 return;
802 }
803
804 ptype = nfc_llcp_ptype(skb);
805 dsap = nfc_llcp_dsap(skb);
806 ssap = nfc_llcp_ssap(skb);
807
808 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
809
810 switch (ptype) {
811 case LLCP_PDU_SYMM:
812 pr_debug("SYMM\n");
813 break;
814
815 case LLCP_PDU_CONNECT:
816 pr_debug("CONNECT\n");
817 nfc_llcp_recv_connect(local, skb);
818 break;
819
820 case LLCP_PDU_DISC:
821 pr_debug("DISC\n");
822 nfc_llcp_recv_disc(local, skb);
823 break;
824
825 case LLCP_PDU_CC:
826 pr_debug("CC\n");
827 nfc_llcp_recv_cc(local, skb);
828 break;
829
830 case LLCP_PDU_I:
831 case LLCP_PDU_RR:
53aef920 832 case LLCP_PDU_RNR:
d646960f
SO		 833 pr_debug("I frame\n");
834 nfc_llcp_recv_hdlc(local, skb);
835 break;
836
837 }
838
839 queue_work(local->tx_wq, &local->tx_work);
840 kfree_skb(local->rx_pending);
841 local->rx_pending = NULL;
842
843 return;
844}
845
846void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
847{
848 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
849
850 pr_debug("Received an LLCP PDU\n");
851 if (err < 0) {
852 pr_err("err %d", err);
853 return;
854 }
855
856 local->rx_pending = skb_get(skb);
857 del_timer(&local->link_timer);
858 queue_work(local->rx_wq, &local->rx_work);
859
860 return;
861}
862
863void nfc_llcp_mac_is_down(struct nfc_dev *dev)
864{
865 struct nfc_llcp_local *local;
866
867 local = nfc_llcp_find_local(dev);
868 if (local == NULL)
869 return;
870
b9a76f1d
SO		 871 nfc_llcp_clear_sdp(local);
872
d646960f
SO		 873 /* Close and purge all existing sockets */
874 nfc_llcp_socket_release(local);
875}
876
877void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
878 u8 comm_mode, u8 rf_mode)
879{
880 struct nfc_llcp_local *local;
881
882 pr_debug("rf mode %d\n", rf_mode);
883
884 local = nfc_llcp_find_local(dev);
885 if (local == NULL)
886 return;
887
888 local->target_idx = target_idx;
889 local->comm_mode = comm_mode;
890 local->rf_mode = rf_mode;
891
892 if (rf_mode == NFC_RF_INITIATOR) {
893 pr_debug("Queueing Tx work\n");
894
895 queue_work(local->tx_wq, &local->tx_work);
896 } else {
897 mod_timer(&local->link_timer,
898 jiffies + msecs_to_jiffies(local->remote_lto));
899 }
900}
901
902int nfc_llcp_register_device(struct nfc_dev *ndev)
903{
904 struct device *dev = &ndev->dev;
905 struct nfc_llcp_local *local;
906 char name[32];
907 int err;
908
909 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
910 if (local == NULL)
911 return -ENOMEM;
912
913 local->dev = ndev;
914 INIT_LIST_HEAD(&local->list);
915 mutex_init(&local->sdp_lock);
916 mutex_init(&local->socket_lock);
917 init_timer(&local->link_timer);
918 local->link_timer.data = (unsigned long) local;
919 local->link_timer.function = nfc_llcp_symm_timer;
920
921 skb_queue_head_init(&local->tx_queue);
922 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
923 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
924 local->tx_wq = alloc_workqueue(name,
925 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
926 if (local->tx_wq == NULL) {
927 err = -ENOMEM;
928 goto err_local;
929 }
930
931 local->rx_pending = NULL;
932 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
933 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
934 local->rx_wq = alloc_workqueue(name,
935 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
936 if (local->rx_wq == NULL) {
937 err = -ENOMEM;
938 goto err_tx_wq;
939 }
940
941 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
942 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
943 local->timeout_wq = alloc_workqueue(name,
944 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1);
945 if (local->timeout_wq == NULL) {
946 err = -ENOMEM;
947 goto err_rx_wq;
948 }
949
950 nfc_llcp_build_gb(local);
951
952 local->remote_miu = LLCP_DEFAULT_MIU;
953 local->remote_lto = LLCP_DEFAULT_LTO;
954 local->remote_rw = LLCP_DEFAULT_RW;
955
956 list_add(&llcp_devices, &local->list);
957
958 return 0;
959
960err_rx_wq:
961 destroy_workqueue(local->rx_wq);
962
963err_tx_wq:
964 destroy_workqueue(local->tx_wq);
965
966err_local:
967 kfree(local);
968
969 return 0;
970}
971
972void nfc_llcp_unregister_device(struct nfc_dev *dev)
973{
974 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
975
976 if (local == NULL) {
977 pr_debug("No such device\n");
978 return;
979 }
980
981 list_del(&local->list);
982 nfc_llcp_socket_release(local);
983 del_timer_sync(&local->link_timer);
984 skb_queue_purge(&local->tx_queue);
985 destroy_workqueue(local->tx_wq);
986 destroy_workqueue(local->rx_wq);
5b68a7ca 987 kfree_skb(local->rx_pending);
d646960f
SO		 988 kfree(local);
989}
990
991int __init nfc_llcp_init(void)
992{
993 INIT_LIST_HEAD(&llcp_devices);
994
995 return nfc_llcp_sock_init();
996}
997
998void nfc_llcp_exit(void)
999{
1000 nfc_llcp_sock_exit();
1001}
Linux kernel - Deliverables
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