projects / deliverable / linux.git / blob
? search:


42994fac26d6c697671075eb86ed8321bfc75711
[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 *miux_tlv, miux_length;
311 __be16 miux;
312 u8 gb_len = 0;
313
314 version = LLCP_VERSION_11;
315 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
316 1, &version_length);
317 gb_len += version_length;
318
319 /* 1500 ms */
320 lto = 150;
321 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &lto, 1, &lto_length);
322 gb_len += lto_length;
323
324 pr_debug("Local wks 0x%lx\n", local->local_wks);
325 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
326 &wks_length);
327 gb_len += wks_length;
328
329 miux = cpu_to_be16(LLCP_MAX_MIUX);
330 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
331 &miux_length);
332 gb_len += miux_length;
333
334 gb_len += ARRAY_SIZE(llcp_magic);
335
336 if (gb_len > NFC_MAX_GT_LEN) {
337 kfree(version_tlv);
338 return -EINVAL;
339 }
340
341 gb_cur = local->gb;
342
343 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
344 gb_cur += ARRAY_SIZE(llcp_magic);
345
346 memcpy(gb_cur, version_tlv, version_length);
347 gb_cur += version_length;
348
349 memcpy(gb_cur, lto_tlv, lto_length);
350 gb_cur += lto_length;
351
352 memcpy(gb_cur, wks_tlv, wks_length);
353 gb_cur += wks_length;
354
355 memcpy(gb_cur, miux_tlv, miux_length);
356 gb_cur += miux_length;
357
358 kfree(version_tlv);
359 kfree(lto_tlv);
360
361 local->gb_len = gb_len;
362
363 return 0;
364 }
365
366 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
367 {
368 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
369
370 if (local == NULL) {
371 pr_err("No LLCP device\n");
372 return -ENODEV;
373 }
374
375 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
376 memcpy(local->remote_gb, gb, gb_len);
377 local->remote_gb_len = gb_len;
378
379 if (local->remote_gb == NULL || local->remote_gb_len == 0)
380 return -ENODEV;
381
382 if (memcmp(local->remote_gb, llcp_magic, 3)) {
383 pr_err("MAC does not support LLCP\n");
384 return -EINVAL;
385 }
386
387 return nfc_llcp_parse_tlv(local,
388 &local->remote_gb[3],
389 local->remote_gb_len - 3);
390 }
391
392 static void nfc_llcp_tx_work(struct work_struct *work)
393 {
394 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
395 tx_work);
396 struct sk_buff *skb;
397
398 skb = skb_dequeue(&local->tx_queue);
399 if (skb != NULL) {
400 pr_debug("Sending pending skb\n");
401 print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET,
402 16, 1, skb->data, skb->len, true);
403
404 nfc_data_exchange(local->dev, local->target_idx,
405 skb, nfc_llcp_recv, local);
406 } else {
407 nfc_llcp_send_symm(local->dev);
408 }
409
410 mod_timer(&local->link_timer,
411 jiffies + msecs_to_jiffies(local->remote_lto));
412 }
413
414 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
415 {
416 return (pdu->data[0] & 0xfc) >> 2;
417 }
418
419 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
420 {
421 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
422 }
423
424 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
425 {
426 return pdu->data[1] & 0x3f;
427 }
428
429 static u8 nfc_llcp_ns(struct sk_buff *pdu)
430 {
431 return pdu->data[2] >> 4;
432 }
433
434 static u8 nfc_llcp_nr(struct sk_buff *pdu)
435 {
436 return pdu->data[2] & 0xf;
437 }
438
439 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
440 {
441 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
442 sock->send_n = (sock->send_n + 1) % 16;
443 sock->recv_ack_n = (sock->recv_n - 1) % 16;
444 }
445
446 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
447 u8 ssap, u8 dsap)
448 {
449 struct nfc_llcp_sock *sock, *llcp_sock, *n;
450
451 pr_debug("ssap dsap %d %d\n", ssap, dsap);
452
453 if (ssap == 0 && dsap == 0)
454 return NULL;
455
456 mutex_lock(&local->socket_lock);
457 sock = local->sockets[ssap];
458 if (sock == NULL) {
459 mutex_unlock(&local->socket_lock);
460 return NULL;
461 }
462
463 pr_debug("root dsap %d (%d)\n", sock->dsap, dsap);
464
465 if (sock->dsap == dsap) {
466 sock_hold(&sock->sk);
467 mutex_unlock(&local->socket_lock);
468 return sock;
469 }
470
471 list_for_each_entry_safe(llcp_sock, n, &sock->list, list) {
472 pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock,
473 &llcp_sock->sk, llcp_sock->dsap);
474 if (llcp_sock->dsap == dsap) {
475 sock_hold(&llcp_sock->sk);
476 mutex_unlock(&local->socket_lock);
477 return llcp_sock;
478 }
479 }
480
481 pr_err("Could not find socket for %d %d\n", ssap, dsap);
482
483 mutex_unlock(&local->socket_lock);
484
485 return NULL;
486 }
487
488 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
489 {
490 sock_put(&sock->sk);
491 }
492
493 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
494 {
495 u8 *tlv = &skb->data[2], type, length;
496 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
497
498 while (offset < tlv_array_len) {
499 type = tlv[0];
500 length = tlv[1];
501
502 pr_debug("type 0x%x length %d\n", type, length);
503
504 if (type == LLCP_TLV_SN) {
505 *sn_len = length;
506 return &tlv[2];
507 }
508
509 offset += length + 2;
510 tlv += length + 2;
511 }
512
513 return NULL;
514 }
515
516 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
517 struct sk_buff *skb)
518 {
519 struct sock *new_sk, *parent;
520 struct nfc_llcp_sock *sock, *new_sock;
521 u8 dsap, ssap, bound_sap, reason;
522
523 dsap = nfc_llcp_dsap(skb);
524 ssap = nfc_llcp_ssap(skb);
525
526 pr_debug("%d %d\n", dsap, ssap);
527
528 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
529 skb->len - LLCP_HEADER_SIZE);
530
531 if (dsap != LLCP_SAP_SDP) {
532 bound_sap = dsap;
533
534 mutex_lock(&local->socket_lock);
535 sock = local->sockets[dsap];
536 if (sock == NULL) {
537 mutex_unlock(&local->socket_lock);
538 reason = LLCP_DM_NOBOUND;
539 goto fail;
540 }
541
542 sock_hold(&sock->sk);
543 mutex_unlock(&local->socket_lock);
544
545 lock_sock(&sock->sk);
546
547 if (sock->dsap == LLCP_SAP_SDP &&
548 sock->sk.sk_state == LLCP_LISTEN)
549 goto enqueue;
550 } else {
551 u8 *sn;
552 size_t sn_len;
553
554 sn = nfc_llcp_connect_sn(skb, &sn_len);
555 if (sn == NULL) {
556 reason = LLCP_DM_NOBOUND;
557 goto fail;
558 }
559
560 pr_debug("Service name length %zu\n", sn_len);
561
562 mutex_lock(&local->socket_lock);
563 for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET;
564 bound_sap++) {
565 sock = local->sockets[bound_sap];
566 if (sock == NULL)
567 continue;
568
569 if (sock->service_name == NULL ||
570 sock->service_name_len == 0)
571 continue;
572
573 if (sock->service_name_len != sn_len)
574 continue;
575
576 if (sock->dsap == LLCP_SAP_SDP &&
577 sock->sk.sk_state == LLCP_LISTEN &&
578 !memcmp(sn, sock->service_name, sn_len)) {
579 pr_debug("Found service name at SAP %d\n",
580 bound_sap);
581 sock_hold(&sock->sk);
582 mutex_unlock(&local->socket_lock);
583
584 lock_sock(&sock->sk);
585
586 goto enqueue;
587 }
588 }
589 mutex_unlock(&local->socket_lock);
590 }
591
592 reason = LLCP_DM_NOBOUND;
593 goto fail;
594
595 enqueue:
596 parent = &sock->sk;
597
598 if (sk_acceptq_is_full(parent)) {
599 reason = LLCP_DM_REJ;
600 release_sock(&sock->sk);
601 sock_put(&sock->sk);
602 goto fail;
603 }
604
605 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
606 if (new_sk == NULL) {
607 reason = LLCP_DM_REJ;
608 release_sock(&sock->sk);
609 sock_put(&sock->sk);
610 goto fail;
611 }
612
613 new_sock = nfc_llcp_sock(new_sk);
614 new_sock->dev = local->dev;
615 new_sock->local = local;
616 new_sock->nfc_protocol = sock->nfc_protocol;
617 new_sock->ssap = bound_sap;
618 new_sock->dsap = ssap;
619 new_sock->parent = parent;
620
621 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
622
623 list_add_tail(&new_sock->list, &sock->list);
624
625 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
626
627 nfc_get_device(local->dev->idx);
628
629 new_sk->sk_state = LLCP_CONNECTED;
630
631 /* Wake the listening processes */
632 parent->sk_data_ready(parent, 0);
633
634 /* Send CC */
635 nfc_llcp_send_cc(new_sock);
636
637 release_sock(&sock->sk);
638 sock_put(&sock->sk);
639
640 return;
641
642 fail:
643 /* Send DM */
644 nfc_llcp_send_dm(local, dsap, ssap, reason);
645
646 return;
647
648 }
649
650 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
651 {
652 int nr_frames = 0;
653 struct nfc_llcp_local *local = sock->local;
654
655 pr_debug("Remote ready %d tx queue len %d remote rw %d",
656 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
657 local->remote_rw);
658
659 /* Try to queue some I frames for transmission */
660 while (sock->remote_ready &&
661 skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) {
662 struct sk_buff *pdu, *pending_pdu;
663
664 pdu = skb_dequeue(&sock->tx_queue);
665 if (pdu == NULL)
666 break;
667
668 /* Update N(S)/N(R) */
669 nfc_llcp_set_nrns(sock, pdu);
670
671 pending_pdu = skb_clone(pdu, GFP_KERNEL);
672
673 skb_queue_tail(&local->tx_queue, pdu);
674 skb_queue_tail(&sock->tx_pending_queue, pending_pdu);
675 nr_frames++;
676 }
677
678 return nr_frames;
679 }
680
681 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
682 struct sk_buff *skb)
683 {
684 struct nfc_llcp_sock *llcp_sock;
685 struct sock *sk;
686 u8 dsap, ssap, ptype, ns, nr;
687
688 ptype = nfc_llcp_ptype(skb);
689 dsap = nfc_llcp_dsap(skb);
690 ssap = nfc_llcp_ssap(skb);
691 ns = nfc_llcp_ns(skb);
692 nr = nfc_llcp_nr(skb);
693
694 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
695
696 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
697 if (llcp_sock == NULL) {
698 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
699 return;
700 }
701
702 sk = &llcp_sock->sk;
703 lock_sock(sk);
704 if (sk->sk_state == LLCP_CLOSED) {
705 release_sock(sk);
706 nfc_llcp_sock_put(llcp_sock);
707 }
708
709 /* Pass the payload upstream */
710 if (ptype == LLCP_PDU_I) {
711 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
712
713 if (ns == llcp_sock->recv_n)
714 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
715 else
716 pr_err("Received out of sequence I PDU\n");
717
718 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
719 if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
720 pr_err("receive queue is full\n");
721 skb_queue_head(&llcp_sock->tx_backlog_queue, skb);
722 }
723 }
724
725 /* Remove skbs from the pending queue */
726 if (llcp_sock->send_ack_n != nr) {
727 struct sk_buff *s, *tmp;
728
729 llcp_sock->send_ack_n = nr;
730
731 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp)
732 if (nfc_llcp_ns(s) <= nr) {
733 skb_unlink(s, &llcp_sock->tx_pending_queue);
734 kfree_skb(s);
735 }
736 }
737
738 if (ptype == LLCP_PDU_RR)
739 llcp_sock->remote_ready = true;
740 else if (ptype == LLCP_PDU_RNR)
741 llcp_sock->remote_ready = false;
742
743 if (nfc_llcp_queue_i_frames(llcp_sock) == 0)
744 nfc_llcp_send_rr(llcp_sock);
745
746 release_sock(sk);
747 nfc_llcp_sock_put(llcp_sock);
748 }
749
750 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
751 struct sk_buff *skb)
752 {
753 struct nfc_llcp_sock *llcp_sock;
754 struct sock *sk;
755 u8 dsap, ssap;
756
757 dsap = nfc_llcp_dsap(skb);
758 ssap = nfc_llcp_ssap(skb);
759
760 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
761 if (llcp_sock == NULL) {
762 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
763 return;
764 }
765
766 sk = &llcp_sock->sk;
767 lock_sock(sk);
768 if (sk->sk_state == LLCP_CLOSED) {
769 release_sock(sk);
770 nfc_llcp_sock_put(llcp_sock);
771 }
772
773 if (sk->sk_state == LLCP_CONNECTED) {
774 nfc_put_device(local->dev);
775 sk->sk_state = LLCP_CLOSED;
776 sk->sk_state_change(sk);
777 }
778
779 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
780
781 release_sock(sk);
782 nfc_llcp_sock_put(llcp_sock);
783 }
784
785 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
786 {
787 struct nfc_llcp_sock *llcp_sock;
788 struct sock *sk;
789 u8 dsap, ssap;
790
791 dsap = nfc_llcp_dsap(skb);
792 ssap = nfc_llcp_ssap(skb);
793
794 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
795
796 if (llcp_sock == NULL)
797 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
798
799 if (llcp_sock == NULL) {
800 pr_err("Invalid CC\n");
801 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
802
803 return;
804 }
805
806 llcp_sock->dsap = ssap;
807 sk = &llcp_sock->sk;
808
809 nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE],
810 skb->len - LLCP_HEADER_SIZE);
811
812 sk->sk_state = LLCP_CONNECTED;
813 sk->sk_state_change(sk);
814
815 nfc_llcp_sock_put(llcp_sock);
816 }
817
818 static void nfc_llcp_rx_work(struct work_struct *work)
819 {
820 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
821 rx_work);
822 u8 dsap, ssap, ptype;
823 struct sk_buff *skb;
824
825 skb = local->rx_pending;
826 if (skb == NULL) {
827 pr_debug("No pending SKB\n");
828 return;
829 }
830
831 ptype = nfc_llcp_ptype(skb);
832 dsap = nfc_llcp_dsap(skb);
833 ssap = nfc_llcp_ssap(skb);
834
835 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
836
837 if (ptype != LLCP_PDU_SYMM)
838 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
839 16, 1, skb->data, skb->len, true);
840
841 switch (ptype) {
842 case LLCP_PDU_SYMM:
843 pr_debug("SYMM\n");
844 break;
845
846 case LLCP_PDU_CONNECT:
847 pr_debug("CONNECT\n");
848 nfc_llcp_recv_connect(local, skb);
849 break;
850
851 case LLCP_PDU_DISC:
852 pr_debug("DISC\n");
853 nfc_llcp_recv_disc(local, skb);
854 break;
855
856 case LLCP_PDU_CC:
857 pr_debug("CC\n");
858 nfc_llcp_recv_cc(local, skb);
859 break;
860
861 case LLCP_PDU_I:
862 case LLCP_PDU_RR:
863 case LLCP_PDU_RNR:
864 pr_debug("I frame\n");
865 nfc_llcp_recv_hdlc(local, skb);
866 break;
867
868 }
869
870 queue_work(local->tx_wq, &local->tx_work);
871 kfree_skb(local->rx_pending);
872 local->rx_pending = NULL;
873
874 return;
875 }
876
877 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
878 {
879 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
880
881 pr_debug("Received an LLCP PDU\n");
882 if (err < 0) {
883 pr_err("err %d\n", err);
884 return;
885 }
886
887 local->rx_pending = skb_get(skb);
888 del_timer(&local->link_timer);
889 queue_work(local->rx_wq, &local->rx_work);
890
891 return;
892 }
893
894 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
895 {
896 struct nfc_llcp_local *local;
897
898 local = nfc_llcp_find_local(dev);
899 if (local == NULL)
900 return;
901
902 nfc_llcp_clear_sdp(local);
903
904 /* Close and purge all existing sockets */
905 nfc_llcp_socket_release(local);
906 }
907
908 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
909 u8 comm_mode, u8 rf_mode)
910 {
911 struct nfc_llcp_local *local;
912
913 pr_debug("rf mode %d\n", rf_mode);
914
915 local = nfc_llcp_find_local(dev);
916 if (local == NULL)
917 return;
918
919 local->target_idx = target_idx;
920 local->comm_mode = comm_mode;
921 local->rf_mode = rf_mode;
922
923 if (rf_mode == NFC_RF_INITIATOR) {
924 pr_debug("Queueing Tx work\n");
925
926 queue_work(local->tx_wq, &local->tx_work);
927 } else {
928 mod_timer(&local->link_timer,
929 jiffies + msecs_to_jiffies(local->remote_lto));
930 }
931 }
932
933 int nfc_llcp_register_device(struct nfc_dev *ndev)
934 {
935 struct device *dev = &ndev->dev;
936 struct nfc_llcp_local *local;
937 char name[32];
938 int err;
939
940 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
941 if (local == NULL)
942 return -ENOMEM;
943
944 local->dev = ndev;
945 INIT_LIST_HEAD(&local->list);
946 mutex_init(&local->sdp_lock);
947 mutex_init(&local->socket_lock);
948 init_timer(&local->link_timer);
949 local->link_timer.data = (unsigned long) local;
950 local->link_timer.function = nfc_llcp_symm_timer;
951
952 skb_queue_head_init(&local->tx_queue);
953 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
954 snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev));
955 local->tx_wq =
956 alloc_workqueue(name,
957 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
958 1);
959 if (local->tx_wq == NULL) {
960 err = -ENOMEM;
961 goto err_local;
962 }
963
964 local->rx_pending = NULL;
965 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
966 snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev));
967 local->rx_wq =
968 alloc_workqueue(name,
969 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
970 1);
971 if (local->rx_wq == NULL) {
972 err = -ENOMEM;
973 goto err_tx_wq;
974 }
975
976 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
977 snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev));
978 local->timeout_wq =
979 alloc_workqueue(name,
980 WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM,
981 1);
982 if (local->timeout_wq == NULL) {
983 err = -ENOMEM;
984 goto err_rx_wq;
985 }
986
987 nfc_llcp_build_gb(local);
988
989 local->remote_miu = LLCP_DEFAULT_MIU;
990 local->remote_lto = LLCP_DEFAULT_LTO;
991 local->remote_rw = LLCP_DEFAULT_RW;
992
993 list_add(&llcp_devices, &local->list);
994
995 return 0;
996
997 err_rx_wq:
998 destroy_workqueue(local->rx_wq);
999
1000 err_tx_wq:
1001 destroy_workqueue(local->tx_wq);
1002
1003 err_local:
1004 kfree(local);
1005
1006 return 0;
1007 }
1008
1009 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1010 {
1011 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1012
1013 if (local == NULL) {
1014 pr_debug("No such device\n");
1015 return;
1016 }
1017
1018 list_del(&local->list);
1019 nfc_llcp_socket_release(local);
1020 del_timer_sync(&local->link_timer);
1021 skb_queue_purge(&local->tx_queue);
1022 destroy_workqueue(local->tx_wq);
1023 destroy_workqueue(local->rx_wq);
1024 kfree_skb(local->rx_pending);
1025 kfree(local);
1026 }
1027
1028 int __init nfc_llcp_init(void)
1029 {
1030 INIT_LIST_HEAD(&llcp_devices);
1031
1032 return nfc_llcp_sock_init();
1033 }
1034
1035 void nfc_llcp_exit(void)
1036 {
1037 nfc_llcp_sock_exit();
1038 }
Linux kernel - Deliverables
This page took 0.05452 seconds and 4 git commands to generate.