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mwifiex: rework round robin scheduling of bss nodes.
[linux-2.6/btrfs-unstable.git] / net / nfc / llcp / llcp.c
blob9e483c8e52f8d81d2319ef0e1832c88b9a38928c
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 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
51 {
52 sock->remote_rw = LLCP_DEFAULT_RW;
53 sock->remote_miu = LLCP_MAX_MIU + 1;
54 }
55
56 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
57 {
58 struct nfc_llcp_local *local = sock->local;
59 struct sk_buff *s, *tmp;
60
61 pr_debug("%p\n", &sock->sk);
62
63 skb_queue_purge(&sock->tx_queue);
64 skb_queue_purge(&sock->tx_pending_queue);
65
66 if (local == NULL)
67 return;
68
69 /* Search for local pending SKBs that are related to this socket */
70 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
71 if (s->sk != &sock->sk)
72 continue;
73
74 skb_unlink(s, &local->tx_queue);
75 kfree_skb(s);
76 }
77 }
78
79 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
80 int err)
81 {
82 struct sock *sk;
83 struct hlist_node *tmp;
84 struct nfc_llcp_sock *llcp_sock;
85
86 skb_queue_purge(&local->tx_queue);
87
88 write_lock(&local->sockets.lock);
89
90 sk_for_each_safe(sk, tmp, &local->sockets.head) {
91 llcp_sock = nfc_llcp_sock(sk);
92
93 bh_lock_sock(sk);
94
95 nfc_llcp_socket_purge(llcp_sock);
96
97 if (sk->sk_state == LLCP_CONNECTED)
98 nfc_put_device(llcp_sock->dev);
99
100 if (sk->sk_state == LLCP_LISTEN) {
101 struct nfc_llcp_sock *lsk, *n;
102 struct sock *accept_sk;
103
104 list_for_each_entry_safe(lsk, n,
105 &llcp_sock->accept_queue,
106 accept_queue) {
107 accept_sk = &lsk->sk;
108 bh_lock_sock(accept_sk);
109
110 nfc_llcp_accept_unlink(accept_sk);
111
112 if (err)
113 accept_sk->sk_err = err;
114 accept_sk->sk_state = LLCP_CLOSED;
115 accept_sk->sk_state_change(sk);
116
117 bh_unlock_sock(accept_sk);
118 }
119 }
120
121 if (err)
122 sk->sk_err = err;
123 sk->sk_state = LLCP_CLOSED;
124 sk->sk_state_change(sk);
125
126 bh_unlock_sock(sk);
127
128 sk_del_node_init(sk);
129 }
130
131 write_unlock(&local->sockets.lock);
132
133 /* If we still have a device, we keep the RAW sockets alive */
134 if (device == true)
135 return;
136
137 write_lock(&local->raw_sockets.lock);
138
139 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
140 llcp_sock = nfc_llcp_sock(sk);
141
142 bh_lock_sock(sk);
143
144 nfc_llcp_socket_purge(llcp_sock);
145
146 if (err)
147 sk->sk_err = err;
148 sk->sk_state = LLCP_CLOSED;
149 sk->sk_state_change(sk);
150
151 bh_unlock_sock(sk);
152
153 sk_del_node_init(sk);
154 }
155
156 write_unlock(&local->raw_sockets.lock);
157 }
158
159 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
160 {
161 kref_get(&local->ref);
162
163 return local;
164 }
165
166 static void local_cleanup(struct nfc_llcp_local *local)
167 {
168 nfc_llcp_socket_release(local, false, ENXIO);
169 del_timer_sync(&local->link_timer);
170 skb_queue_purge(&local->tx_queue);
171 cancel_work_sync(&local->tx_work);
172 cancel_work_sync(&local->rx_work);
173 cancel_work_sync(&local->timeout_work);
174 kfree_skb(local->rx_pending);
175 del_timer_sync(&local->sdreq_timer);
176 cancel_work_sync(&local->sdreq_timeout_work);
177 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
178 }
179
180 static void local_release(struct kref *ref)
181 {
182 struct nfc_llcp_local *local;
183
184 local = container_of(ref, struct nfc_llcp_local, ref);
185
186 list_del(&local->list);
187 local_cleanup(local);
188 kfree(local);
189 }
190
191 int nfc_llcp_local_put(struct nfc_llcp_local *local)
192 {
193 if (local == NULL)
194 return 0;
195
196 return kref_put(&local->ref, local_release);
197 }
198
199 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
200 u8 ssap, u8 dsap)
201 {
202 struct sock *sk;
203 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
204
205 pr_debug("ssap dsap %d %d\n", ssap, dsap);
206
207 if (ssap == 0 && dsap == 0)
208 return NULL;
209
210 read_lock(&local->sockets.lock);
211
212 llcp_sock = NULL;
213
214 sk_for_each(sk, &local->sockets.head) {
215 tmp_sock = nfc_llcp_sock(sk);
216
217 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
218 llcp_sock = tmp_sock;
219 break;
220 }
221 }
222
223 read_unlock(&local->sockets.lock);
224
225 if (llcp_sock == NULL)
226 return NULL;
227
228 sock_hold(&llcp_sock->sk);
229
230 return llcp_sock;
231 }
232
233 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
234 {
235 sock_put(&sock->sk);
236 }
237
238 static void nfc_llcp_timeout_work(struct work_struct *work)
239 {
240 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
241 timeout_work);
242
243 nfc_dep_link_down(local->dev);
244 }
245
246 static void nfc_llcp_symm_timer(unsigned long data)
247 {
248 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
249
250 pr_err("SYMM timeout\n");
251
252 schedule_work(&local->timeout_work);
253 }
254
255 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
256 {
257 unsigned long time;
258 HLIST_HEAD(nl_sdres_list);
259 struct hlist_node *n;
260 struct nfc_llcp_sdp_tlv *sdp;
261 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
262 sdreq_timeout_work);
263
264 mutex_lock(&local->sdreq_lock);
265
266 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
267
268 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
269 if (time_after(sdp->time, time))
270 continue;
271
272 sdp->sap = LLCP_SDP_UNBOUND;
273
274 hlist_del(&sdp->node);
275
276 hlist_add_head(&sdp->node, &nl_sdres_list);
277 }
278
279 if (!hlist_empty(&local->pending_sdreqs))
280 mod_timer(&local->sdreq_timer,
281 jiffies + msecs_to_jiffies(3 * local->remote_lto));
282
283 mutex_unlock(&local->sdreq_lock);
284
285 if (!hlist_empty(&nl_sdres_list))
286 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
287 }
288
289 static void nfc_llcp_sdreq_timer(unsigned long data)
290 {
291 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
292
293 schedule_work(&local->sdreq_timeout_work);
294 }
295
296 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
297 {
298 struct nfc_llcp_local *local, *n;
299
300 list_for_each_entry_safe(local, n, &llcp_devices, list)
301 if (local->dev == dev)
302 return local;
303
304 pr_debug("No device found\n");
305
306 return NULL;
307 }
308
309 static char *wks[] = {
310 NULL,
311 NULL, /* SDP */
312 "urn:nfc:sn:ip",
313 "urn:nfc:sn:obex",
314 "urn:nfc:sn:snep",
315 };
316
317 static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
318 {
319 int sap, num_wks;
320
321 pr_debug("%s\n", service_name);
322
323 if (service_name == NULL)
324 return -EINVAL;
325
326 num_wks = ARRAY_SIZE(wks);
327
328 for (sap = 0; sap < num_wks; sap++) {
329 if (wks[sap] == NULL)
330 continue;
331
332 if (strncmp(wks[sap], service_name, service_name_len) == 0)
333 return sap;
334 }
335
336 return -EINVAL;
337 }
338
339 static
340 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
341 u8 *sn, size_t sn_len)
342 {
343 struct sock *sk;
344 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
345
346 pr_debug("sn %zd %p\n", sn_len, sn);
347
348 if (sn == NULL || sn_len == 0)
349 return NULL;
350
351 read_lock(&local->sockets.lock);
352
353 llcp_sock = NULL;
354
355 sk_for_each(sk, &local->sockets.head) {
356 tmp_sock = nfc_llcp_sock(sk);
357
358 pr_debug("llcp sock %p\n", tmp_sock);
359
360 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
361 tmp_sock->sk.sk_state != LLCP_LISTEN)
362 continue;
363
364 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
365 tmp_sock->sk.sk_state != LLCP_BOUND)
366 continue;
367
368 if (tmp_sock->service_name == NULL ||
369 tmp_sock->service_name_len == 0)
370 continue;
371
372 if (tmp_sock->service_name_len != sn_len)
373 continue;
374
375 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
376 llcp_sock = tmp_sock;
377 break;
378 }
379 }
380
381 read_unlock(&local->sockets.lock);
382
383 pr_debug("Found llcp sock %p\n", llcp_sock);
384
385 return llcp_sock;
386 }
387
388 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
389 struct nfc_llcp_sock *sock)
390 {
391 mutex_lock(&local->sdp_lock);
392
393 if (sock->service_name != NULL && sock->service_name_len > 0) {
394 int ssap = nfc_llcp_wks_sap(sock->service_name,
395 sock->service_name_len);
396
397 if (ssap > 0) {
398 pr_debug("WKS %d\n", ssap);
399
400 /* This is a WKS, let's check if it's free */
401 if (local->local_wks & BIT(ssap)) {
402 mutex_unlock(&local->sdp_lock);
403
404 return LLCP_SAP_MAX;
405 }
406
407 set_bit(ssap, &local->local_wks);
408 mutex_unlock(&local->sdp_lock);
409
410 return ssap;
411 }
412
413 /*
414 * Check if there already is a non WKS socket bound
415 * to this service name.
416 */
417 if (nfc_llcp_sock_from_sn(local, sock->service_name,
418 sock->service_name_len) != NULL) {
419 mutex_unlock(&local->sdp_lock);
420
421 return LLCP_SAP_MAX;
422 }
423
424 mutex_unlock(&local->sdp_lock);
425
426 return LLCP_SDP_UNBOUND;
427
428 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
429 if (!test_bit(sock->ssap, &local->local_wks)) {
430 set_bit(sock->ssap, &local->local_wks);
431 mutex_unlock(&local->sdp_lock);
432
433 return sock->ssap;
434 }
435 }
436
437 mutex_unlock(&local->sdp_lock);
438
439 return LLCP_SAP_MAX;
440 }
441
442 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
443 {
444 u8 local_ssap;
445
446 mutex_lock(&local->sdp_lock);
447
448 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
449 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
450 mutex_unlock(&local->sdp_lock);
451 return LLCP_SAP_MAX;
452 }
453
454 set_bit(local_ssap, &local->local_sap);
455
456 mutex_unlock(&local->sdp_lock);
457
458 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
459 }
460
461 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
462 {
463 u8 local_ssap;
464 unsigned long *sdp;
465
466 if (ssap < LLCP_WKS_NUM_SAP) {
467 local_ssap = ssap;
468 sdp = &local->local_wks;
469 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
470 atomic_t *client_cnt;
471
472 local_ssap = ssap - LLCP_WKS_NUM_SAP;
473 sdp = &local->local_sdp;
474 client_cnt = &local->local_sdp_cnt[local_ssap];
475
476 pr_debug("%d clients\n", atomic_read(client_cnt));
477
478 mutex_lock(&local->sdp_lock);
479
480 if (atomic_dec_and_test(client_cnt)) {
481 struct nfc_llcp_sock *l_sock;
482
483 pr_debug("No more clients for SAP %d\n", ssap);
484
485 clear_bit(local_ssap, sdp);
486
487 /* Find the listening sock and set it back to UNBOUND */
488 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
489 if (l_sock) {
490 l_sock->ssap = LLCP_SDP_UNBOUND;
491 nfc_llcp_sock_put(l_sock);
492 }
493 }
494
495 mutex_unlock(&local->sdp_lock);
496
497 return;
498 } else if (ssap < LLCP_MAX_SAP) {
499 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
500 sdp = &local->local_sap;
501 } else {
502 return;
503 }
504
505 mutex_lock(&local->sdp_lock);
506
507 clear_bit(local_ssap, sdp);
508
509 mutex_unlock(&local->sdp_lock);
510 }
511
512 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
513 {
514 u8 ssap;
515
516 mutex_lock(&local->sdp_lock);
517
518 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
519 if (ssap == LLCP_SDP_NUM_SAP) {
520 mutex_unlock(&local->sdp_lock);
521
522 return LLCP_SAP_MAX;
523 }
524
525 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
526
527 set_bit(ssap, &local->local_sdp);
528
529 mutex_unlock(&local->sdp_lock);
530
531 return LLCP_WKS_NUM_SAP + ssap;
532 }
533
534 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
535 {
536 u8 *gb_cur, *version_tlv, version, version_length;
537 u8 *lto_tlv, lto_length;
538 u8 *wks_tlv, wks_length;
539 u8 *miux_tlv, miux_length;
540 u8 gb_len = 0;
541 int ret = 0;
542
543 version = LLCP_VERSION_11;
544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
545 1, &version_length);
546 gb_len += version_length;
547
548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
549 gb_len += lto_length;
550
551 pr_debug("Local wks 0x%lx\n", local->local_wks);
552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2,
553 &wks_length);
554 gb_len += wks_length;
555
556 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
557 &miux_length);
558 gb_len += miux_length;
559
560 gb_len += ARRAY_SIZE(llcp_magic);
561
562 if (gb_len > NFC_MAX_GT_LEN) {
563 ret = -EINVAL;
564 goto out;
565 }
566
567 gb_cur = local->gb;
568
569 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
570 gb_cur += ARRAY_SIZE(llcp_magic);
571
572 memcpy(gb_cur, version_tlv, version_length);
573 gb_cur += version_length;
574
575 memcpy(gb_cur, lto_tlv, lto_length);
576 gb_cur += lto_length;
577
578 memcpy(gb_cur, wks_tlv, wks_length);
579 gb_cur += wks_length;
580
581 memcpy(gb_cur, miux_tlv, miux_length);
582 gb_cur += miux_length;
583
584 local->gb_len = gb_len;
585
586 out:
587 kfree(version_tlv);
588 kfree(lto_tlv);
589 kfree(wks_tlv);
590 kfree(miux_tlv);
591
592 return ret;
593 }
594
595 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
596 {
597 struct nfc_llcp_local *local;
598
599 local = nfc_llcp_find_local(dev);
600 if (local == NULL) {
601 *general_bytes_len = 0;
602 return NULL;
603 }
604
605 nfc_llcp_build_gb(local);
606
607 *general_bytes_len = local->gb_len;
608
609 return local->gb;
610 }
611
612 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
613 {
614 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
615
616 if (local == NULL) {
617 pr_err("No LLCP device\n");
618 return -ENODEV;
619 }
620 if (gb_len < 3)
621 return -EINVAL;
622
623 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
624 memcpy(local->remote_gb, gb, gb_len);
625 local->remote_gb_len = gb_len;
626
627 if (memcmp(local->remote_gb, llcp_magic, 3)) {
628 pr_err("MAC does not support LLCP\n");
629 return -EINVAL;
630 }
631
632 return nfc_llcp_parse_gb_tlv(local,
633 &local->remote_gb[3],
634 local->remote_gb_len - 3);
635 }
636
637 static u8 nfc_llcp_dsap(struct sk_buff *pdu)
638 {
639 return (pdu->data[0] & 0xfc) >> 2;
640 }
641
642 static u8 nfc_llcp_ptype(struct sk_buff *pdu)
643 {
644 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
645 }
646
647 static u8 nfc_llcp_ssap(struct sk_buff *pdu)
648 {
649 return pdu->data[1] & 0x3f;
650 }
651
652 static u8 nfc_llcp_ns(struct sk_buff *pdu)
653 {
654 return pdu->data[2] >> 4;
655 }
656
657 static u8 nfc_llcp_nr(struct sk_buff *pdu)
658 {
659 return pdu->data[2] & 0xf;
660 }
661
662 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
663 {
664 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
665 sock->send_n = (sock->send_n + 1) % 16;
666 sock->recv_ack_n = (sock->recv_n - 1) % 16;
667 }
668
669 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
670 struct sk_buff *skb, u8 direction)
671 {
672 struct sk_buff *skb_copy = NULL, *nskb;
673 struct sock *sk;
674 u8 *data;
675
676 read_lock(&local->raw_sockets.lock);
677
678 sk_for_each(sk, &local->raw_sockets.head) {
679 if (sk->sk_state != LLCP_BOUND)
680 continue;
681
682 if (skb_copy == NULL) {
683 skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE,
684 GFP_ATOMIC);
685
686 if (skb_copy == NULL)
687 continue;
688
689 data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE);
690
691 data[0] = local->dev ? local->dev->idx : 0xFF;
692 data[1] = direction;
693 }
694
695 nskb = skb_clone(skb_copy, GFP_ATOMIC);
696 if (!nskb)
697 continue;
698
699 if (sock_queue_rcv_skb(sk, nskb))
700 kfree_skb(nskb);
701 }
702
703 read_unlock(&local->raw_sockets.lock);
704
705 kfree_skb(skb_copy);
706 }
707
708 static void nfc_llcp_tx_work(struct work_struct *work)
709 {
710 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
711 tx_work);
712 struct sk_buff *skb;
713 struct sock *sk;
714 struct nfc_llcp_sock *llcp_sock;
715
716 skb = skb_dequeue(&local->tx_queue);
717 if (skb != NULL) {
718 sk = skb->sk;
719 llcp_sock = nfc_llcp_sock(sk);
720
721 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
722 nfc_llcp_send_symm(local->dev);
723 } else {
724 struct sk_buff *copy_skb = NULL;
725 u8 ptype = nfc_llcp_ptype(skb);
726 int ret;
727
728 pr_debug("Sending pending skb\n");
729 print_hex_dump(KERN_DEBUG, "LLCP Tx: ",
730 DUMP_PREFIX_OFFSET, 16, 1,
731 skb->data, skb->len, true);
732
733 if (ptype == LLCP_PDU_I)
734 copy_skb = skb_copy(skb, GFP_ATOMIC);
735
736 __net_timestamp(skb);
737
738 nfc_llcp_send_to_raw_sock(local, skb,
739 NFC_LLCP_DIRECTION_TX);
740
741 ret = nfc_data_exchange(local->dev, local->target_idx,
742 skb, nfc_llcp_recv, local);
743
744 if (ret) {
745 kfree_skb(copy_skb);
746 goto out;
747 }
748
749 if (ptype == LLCP_PDU_I && copy_skb)
750 skb_queue_tail(&llcp_sock->tx_pending_queue,
751 copy_skb);
752 }
753 } else {
754 nfc_llcp_send_symm(local->dev);
755 }
756
757 out:
758 mod_timer(&local->link_timer,
759 jiffies + msecs_to_jiffies(2 * local->remote_lto));
760 }
761
762 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
763 u8 ssap)
764 {
765 struct sock *sk;
766 struct nfc_llcp_sock *llcp_sock;
767
768 read_lock(&local->connecting_sockets.lock);
769
770 sk_for_each(sk, &local->connecting_sockets.head) {
771 llcp_sock = nfc_llcp_sock(sk);
772
773 if (llcp_sock->ssap == ssap) {
774 sock_hold(&llcp_sock->sk);
775 goto out;
776 }
777 }
778
779 llcp_sock = NULL;
780
781 out:
782 read_unlock(&local->connecting_sockets.lock);
783
784 return llcp_sock;
785 }
786
787 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
788 u8 *sn, size_t sn_len)
789 {
790 struct nfc_llcp_sock *llcp_sock;
791
792 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
793
794 if (llcp_sock == NULL)
795 return NULL;
796
797 sock_hold(&llcp_sock->sk);
798
799 return llcp_sock;
800 }
801
802 static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
803 {
804 u8 *tlv = &skb->data[2], type, length;
805 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
806
807 while (offset < tlv_array_len) {
808 type = tlv[0];
809 length = tlv[1];
810
811 pr_debug("type 0x%x length %d\n", type, length);
812
813 if (type == LLCP_TLV_SN) {
814 *sn_len = length;
815 return &tlv[2];
816 }
817
818 offset += length + 2;
819 tlv += length + 2;
820 }
821
822 return NULL;
823 }
824
825 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
826 struct sk_buff *skb)
827 {
828 struct nfc_llcp_sock *llcp_sock;
829 struct nfc_llcp_ui_cb *ui_cb;
830 u8 dsap, ssap;
831
832 dsap = nfc_llcp_dsap(skb);
833 ssap = nfc_llcp_ssap(skb);
834
835 ui_cb = nfc_llcp_ui_skb_cb(skb);
836 ui_cb->dsap = dsap;
837 ui_cb->ssap = ssap;
838
839 pr_debug("%d %d\n", dsap, ssap);
840
841 /* We're looking for a bound socket, not a client one */
842 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
843 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
844 return;
845
846 /* There is no sequence with UI frames */
847 skb_pull(skb, LLCP_HEADER_SIZE);
848 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
849 /*
850 * UI frames will be freed from the socket layer, so we
851 * need to keep them alive until someone receives them.
852 */
853 skb_get(skb);
854 } else {
855 pr_err("Receive queue is full\n");
856 }
857
858 nfc_llcp_sock_put(llcp_sock);
859 }
860
861 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
862 struct sk_buff *skb)
863 {
864 struct sock *new_sk, *parent;
865 struct nfc_llcp_sock *sock, *new_sock;
866 u8 dsap, ssap, reason;
867
868 dsap = nfc_llcp_dsap(skb);
869 ssap = nfc_llcp_ssap(skb);
870
871 pr_debug("%d %d\n", dsap, ssap);
872
873 if (dsap != LLCP_SAP_SDP) {
874 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
875 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
876 reason = LLCP_DM_NOBOUND;
877 goto fail;
878 }
879 } else {
880 u8 *sn;
881 size_t sn_len;
882
883 sn = nfc_llcp_connect_sn(skb, &sn_len);
884 if (sn == NULL) {
885 reason = LLCP_DM_NOBOUND;
886 goto fail;
887 }
888
889 pr_debug("Service name length %zu\n", sn_len);
890
891 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
892 if (sock == NULL) {
893 reason = LLCP_DM_NOBOUND;
894 goto fail;
895 }
896 }
897
898 lock_sock(&sock->sk);
899
900 parent = &sock->sk;
901
902 if (sk_acceptq_is_full(parent)) {
903 reason = LLCP_DM_REJ;
904 release_sock(&sock->sk);
905 sock_put(&sock->sk);
906 goto fail;
907 }
908
909 if (sock->ssap == LLCP_SDP_UNBOUND) {
910 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
911
912 pr_debug("First client, reserving %d\n", ssap);
913
914 if (ssap == LLCP_SAP_MAX) {
915 reason = LLCP_DM_REJ;
916 release_sock(&sock->sk);
917 sock_put(&sock->sk);
918 goto fail;
919 }
920
921 sock->ssap = ssap;
922 }
923
924 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC);
925 if (new_sk == NULL) {
926 reason = LLCP_DM_REJ;
927 release_sock(&sock->sk);
928 sock_put(&sock->sk);
929 goto fail;
930 }
931
932 new_sock = nfc_llcp_sock(new_sk);
933 new_sock->dev = local->dev;
934 new_sock->local = nfc_llcp_local_get(local);
935 new_sock->rw = sock->rw;
936 new_sock->miux = sock->miux;
937 new_sock->remote_miu = local->remote_miu;
938 new_sock->nfc_protocol = sock->nfc_protocol;
939 new_sock->dsap = ssap;
940 new_sock->target_idx = local->target_idx;
941 new_sock->parent = parent;
942 new_sock->ssap = sock->ssap;
943 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
944 atomic_t *client_count;
945
946 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
947
948 client_count =
949 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
950
951 atomic_inc(client_count);
952 new_sock->reserved_ssap = sock->ssap;
953 }
954
955 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
956 skb->len - LLCP_HEADER_SIZE);
957
958 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
959
960 nfc_llcp_sock_link(&local->sockets, new_sk);
961
962 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
963
964 nfc_get_device(local->dev->idx);
965
966 new_sk->sk_state = LLCP_CONNECTED;
967
968 /* Wake the listening processes */
969 parent->sk_data_ready(parent, 0);
970
971 /* Send CC */
972 nfc_llcp_send_cc(new_sock);
973
974 release_sock(&sock->sk);
975 sock_put(&sock->sk);
976
977 return;
978
979 fail:
980 /* Send DM */
981 nfc_llcp_send_dm(local, dsap, ssap, reason);
982 }
983
984 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
985 {
986 int nr_frames = 0;
987 struct nfc_llcp_local *local = sock->local;
988
989 pr_debug("Remote ready %d tx queue len %d remote rw %d",
990 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
991 sock->remote_rw);
992
993 /* Try to queue some I frames for transmission */
994 while (sock->remote_ready &&
995 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
996 struct sk_buff *pdu;
997
998 pdu = skb_dequeue(&sock->tx_queue);
999 if (pdu == NULL)
1000 break;
1001
1002 /* Update N(S)/N(R) */
1003 nfc_llcp_set_nrns(sock, pdu);
1004
1005 skb_queue_tail(&local->tx_queue, pdu);
1006 nr_frames++;
1007 }
1008
1009 return nr_frames;
1010 }
1011
1012 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1013 struct sk_buff *skb)
1014 {
1015 struct nfc_llcp_sock *llcp_sock;
1016 struct sock *sk;
1017 u8 dsap, ssap, ptype, ns, nr;
1018
1019 ptype = nfc_llcp_ptype(skb);
1020 dsap = nfc_llcp_dsap(skb);
1021 ssap = nfc_llcp_ssap(skb);
1022 ns = nfc_llcp_ns(skb);
1023 nr = nfc_llcp_nr(skb);
1024
1025 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1026
1027 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1028 if (llcp_sock == NULL) {
1029 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1030 return;
1031 }
1032
1033 sk = &llcp_sock->sk;
1034 lock_sock(sk);
1035 if (sk->sk_state == LLCP_CLOSED) {
1036 release_sock(sk);
1037 nfc_llcp_sock_put(llcp_sock);
1038 }
1039
1040 /* Pass the payload upstream */
1041 if (ptype == LLCP_PDU_I) {
1042 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1043
1044 if (ns == llcp_sock->recv_n)
1045 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1046 else
1047 pr_err("Received out of sequence I PDU\n");
1048
1049 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1050 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1051 /*
1052 * I frames will be freed from the socket layer, so we
1053 * need to keep them alive until someone receives them.
1054 */
1055 skb_get(skb);
1056 } else {
1057 pr_err("Receive queue is full\n");
1058 }
1059 }
1060
1061 /* Remove skbs from the pending queue */
1062 if (llcp_sock->send_ack_n != nr) {
1063 struct sk_buff *s, *tmp;
1064 u8 n;
1065
1066 llcp_sock->send_ack_n = nr;
1067
1068 /* Remove and free all skbs until ns == nr */
1069 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1070 n = nfc_llcp_ns(s);
1071
1072 skb_unlink(s, &llcp_sock->tx_pending_queue);
1073 kfree_skb(s);
1074
1075 if (n == nr)
1076 break;
1077 }
1078
1079 /* Re-queue the remaining skbs for transmission */
1080 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1081 s, tmp) {
1082 skb_unlink(s, &llcp_sock->tx_pending_queue);
1083 skb_queue_head(&local->tx_queue, s);
1084 }
1085 }
1086
1087 if (ptype == LLCP_PDU_RR)
1088 llcp_sock->remote_ready = true;
1089 else if (ptype == LLCP_PDU_RNR)
1090 llcp_sock->remote_ready = false;
1091
1092 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1093 nfc_llcp_send_rr(llcp_sock);
1094
1095 release_sock(sk);
1096 nfc_llcp_sock_put(llcp_sock);
1097 }
1098
1099 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1100 struct sk_buff *skb)
1101 {
1102 struct nfc_llcp_sock *llcp_sock;
1103 struct sock *sk;
1104 u8 dsap, ssap;
1105
1106 dsap = nfc_llcp_dsap(skb);
1107 ssap = nfc_llcp_ssap(skb);
1108
1109 if ((dsap == 0) && (ssap == 0)) {
1110 pr_debug("Connection termination");
1111 nfc_dep_link_down(local->dev);
1112 return;
1113 }
1114
1115 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1116 if (llcp_sock == NULL) {
1117 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1118 return;
1119 }
1120
1121 sk = &llcp_sock->sk;
1122 lock_sock(sk);
1123
1124 nfc_llcp_socket_purge(llcp_sock);
1125
1126 if (sk->sk_state == LLCP_CLOSED) {
1127 release_sock(sk);
1128 nfc_llcp_sock_put(llcp_sock);
1129 }
1130
1131 if (sk->sk_state == LLCP_CONNECTED) {
1132 nfc_put_device(local->dev);
1133 sk->sk_state = LLCP_CLOSED;
1134 sk->sk_state_change(sk);
1135 }
1136
1137 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1138
1139 release_sock(sk);
1140 nfc_llcp_sock_put(llcp_sock);
1141 }
1142
1143 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
1144 {
1145 struct nfc_llcp_sock *llcp_sock;
1146 struct sock *sk;
1147 u8 dsap, ssap;
1148
1149 dsap = nfc_llcp_dsap(skb);
1150 ssap = nfc_llcp_ssap(skb);
1151
1152 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1153 if (llcp_sock == NULL) {
1154 pr_err("Invalid CC\n");
1155 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1156
1157 return;
1158 }
1159
1160 sk = &llcp_sock->sk;
1161
1162 /* Unlink from connecting and link to the client array */
1163 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1164 nfc_llcp_sock_link(&local->sockets, sk);
1165 llcp_sock->dsap = ssap;
1166
1167 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1168 skb->len - LLCP_HEADER_SIZE);
1169
1170 sk->sk_state = LLCP_CONNECTED;
1171 sk->sk_state_change(sk);
1172
1173 nfc_llcp_sock_put(llcp_sock);
1174 }
1175
1176 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1177 {
1178 struct nfc_llcp_sock *llcp_sock;
1179 struct sock *sk;
1180 u8 dsap, ssap, reason;
1181
1182 dsap = nfc_llcp_dsap(skb);
1183 ssap = nfc_llcp_ssap(skb);
1184 reason = skb->data[2];
1185
1186 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1187
1188 switch (reason) {
1189 case LLCP_DM_NOBOUND:
1190 case LLCP_DM_REJ:
1191 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1192 break;
1193
1194 default:
1195 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1196 break;
1197 }
1198
1199 if (llcp_sock == NULL) {
1200 pr_debug("Already closed\n");
1201 return;
1202 }
1203
1204 sk = &llcp_sock->sk;
1205
1206 sk->sk_err = ENXIO;
1207 sk->sk_state = LLCP_CLOSED;
1208 sk->sk_state_change(sk);
1209
1210 nfc_llcp_sock_put(llcp_sock);
1211 }
1212
1213 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1214 struct sk_buff *skb)
1215 {
1216 struct nfc_llcp_sock *llcp_sock;
1217 u8 dsap, ssap, *tlv, type, length, tid, sap;
1218 u16 tlv_len, offset;
1219 char *service_name;
1220 size_t service_name_len;
1221 struct nfc_llcp_sdp_tlv *sdp;
1222 HLIST_HEAD(llc_sdres_list);
1223 size_t sdres_tlvs_len;
1224 HLIST_HEAD(nl_sdres_list);
1225
1226 dsap = nfc_llcp_dsap(skb);
1227 ssap = nfc_llcp_ssap(skb);
1228
1229 pr_debug("%d %d\n", dsap, ssap);
1230
1231 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1232 pr_err("Wrong SNL SAP\n");
1233 return;
1234 }
1235
1236 tlv = &skb->data[LLCP_HEADER_SIZE];
1237 tlv_len = skb->len - LLCP_HEADER_SIZE;
1238 offset = 0;
1239 sdres_tlvs_len = 0;
1240
1241 while (offset < tlv_len) {
1242 type = tlv[0];
1243 length = tlv[1];
1244
1245 switch (type) {
1246 case LLCP_TLV_SDREQ:
1247 tid = tlv[2];
1248 service_name = (char *) &tlv[3];
1249 service_name_len = length - 1;
1250
1251 pr_debug("Looking for %.16s\n", service_name);
1252
1253 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1254 !strncmp(service_name, "urn:nfc:sn:sdp",
1255 service_name_len)) {
1256 sap = 1;
1257 goto add_snl;
1258 }
1259
1260 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1261 service_name_len);
1262 if (!llcp_sock) {
1263 sap = 0;
1264 goto add_snl;
1265 }
1266
1267 /*
1268 * We found a socket but its ssap has not been reserved
1269 * yet. We need to assign it for good and send a reply.
1270 * The ssap will be freed when the socket is closed.
1271 */
1272 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1273 atomic_t *client_count;
1274
1275 sap = nfc_llcp_reserve_sdp_ssap(local);
1276
1277 pr_debug("Reserving %d\n", sap);
1278
1279 if (sap == LLCP_SAP_MAX) {
1280 sap = 0;
1281 goto add_snl;
1282 }
1283
1284 client_count =
1285 &local->local_sdp_cnt[sap -
1286 LLCP_WKS_NUM_SAP];
1287
1288 atomic_inc(client_count);
1289
1290 llcp_sock->ssap = sap;
1291 llcp_sock->reserved_ssap = sap;
1292 } else {
1293 sap = llcp_sock->ssap;
1294 }
1295
1296 pr_debug("%p %d\n", llcp_sock, sap);
1297
1298 add_snl:
1299 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1300 if (sdp == NULL)
1301 goto exit;
1302
1303 sdres_tlvs_len += sdp->tlv_len;
1304 hlist_add_head(&sdp->node, &llc_sdres_list);
1305 break;
1306
1307 case LLCP_TLV_SDRES:
1308 mutex_lock(&local->sdreq_lock);
1309
1310 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1311
1312 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1313 if (sdp->tid != tlv[2])
1314 continue;
1315
1316 sdp->sap = tlv[3];
1317
1318 pr_debug("Found: uri=%s, sap=%d\n",
1319 sdp->uri, sdp->sap);
1320
1321 hlist_del(&sdp->node);
1322
1323 hlist_add_head(&sdp->node, &nl_sdres_list);
1324
1325 break;
1326 }
1327
1328 mutex_unlock(&local->sdreq_lock);
1329 break;
1330
1331 default:
1332 pr_err("Invalid SNL tlv value 0x%x\n", type);
1333 break;
1334 }
1335
1336 offset += length + 2;
1337 tlv += length + 2;
1338 }
1339
1340 exit:
1341 if (!hlist_empty(&nl_sdres_list))
1342 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1343
1344 if (!hlist_empty(&llc_sdres_list))
1345 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1346 }
1347
1348 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1349 {
1350 u8 ptype;
1351 u16 pdu_len;
1352 struct sk_buff *new_skb;
1353
1354 if (skb->len <= LLCP_HEADER_SIZE) {
1355 pr_err("Malformed AGF PDU\n");
1356 return;
1357 }
1358
1359 skb_pull(skb, LLCP_HEADER_SIZE);
1360
1361 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1362 pdu_len = skb->data[0] << 8 | skb->data[1];
1363
1364 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1365
1366 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1367 pr_err("Malformed AGF PDU\n");
1368 return;
1369 }
1370
1371 ptype = nfc_llcp_ptype(skb);
1372
1373 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1374 goto next;
1375
1376 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1377 if (new_skb == NULL) {
1378 pr_err("Could not allocate PDU\n");
1379 return;
1380 }
1381
1382 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1383
1384 nfc_llcp_rx_skb(local, new_skb);
1385
1386 kfree_skb(new_skb);
1387 next:
1388 skb_pull(skb, pdu_len);
1389 }
1390 }
1391
1392 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1393 {
1394 u8 dsap, ssap, ptype;
1395
1396 ptype = nfc_llcp_ptype(skb);
1397 dsap = nfc_llcp_dsap(skb);
1398 ssap = nfc_llcp_ssap(skb);
1399
1400 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1401
1402 if (ptype != LLCP_PDU_SYMM)
1403 print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET,
1404 16, 1, skb->data, skb->len, true);
1405
1406 switch (ptype) {
1407 case LLCP_PDU_SYMM:
1408 pr_debug("SYMM\n");
1409 break;
1410
1411 case LLCP_PDU_UI:
1412 pr_debug("UI\n");
1413 nfc_llcp_recv_ui(local, skb);
1414 break;
1415
1416 case LLCP_PDU_CONNECT:
1417 pr_debug("CONNECT\n");
1418 nfc_llcp_recv_connect(local, skb);
1419 break;
1420
1421 case LLCP_PDU_DISC:
1422 pr_debug("DISC\n");
1423 nfc_llcp_recv_disc(local, skb);
1424 break;
1425
1426 case LLCP_PDU_CC:
1427 pr_debug("CC\n");
1428 nfc_llcp_recv_cc(local, skb);
1429 break;
1430
1431 case LLCP_PDU_DM:
1432 pr_debug("DM\n");
1433 nfc_llcp_recv_dm(local, skb);
1434 break;
1435
1436 case LLCP_PDU_SNL:
1437 pr_debug("SNL\n");
1438 nfc_llcp_recv_snl(local, skb);
1439 break;
1440
1441 case LLCP_PDU_I:
1442 case LLCP_PDU_RR:
1443 case LLCP_PDU_RNR:
1444 pr_debug("I frame\n");
1445 nfc_llcp_recv_hdlc(local, skb);
1446 break;
1447
1448 case LLCP_PDU_AGF:
1449 pr_debug("AGF frame\n");
1450 nfc_llcp_recv_agf(local, skb);
1451 break;
1452 }
1453 }
1454
1455 static void nfc_llcp_rx_work(struct work_struct *work)
1456 {
1457 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1458 rx_work);
1459 struct sk_buff *skb;
1460
1461 skb = local->rx_pending;
1462 if (skb == NULL) {
1463 pr_debug("No pending SKB\n");
1464 return;
1465 }
1466
1467 __net_timestamp(skb);
1468
1469 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX);
1470
1471 nfc_llcp_rx_skb(local, skb);
1472
1473 schedule_work(&local->tx_work);
1474 kfree_skb(local->rx_pending);
1475 local->rx_pending = NULL;
1476 }
1477
1478 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1479 {
1480 local->rx_pending = skb;
1481 del_timer(&local->link_timer);
1482 schedule_work(&local->rx_work);
1483 }
1484
1485 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1486 {
1487 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1488
1489 pr_debug("Received an LLCP PDU\n");
1490 if (err < 0) {
1491 pr_err("err %d\n", err);
1492 return;
1493 }
1494
1495 __nfc_llcp_recv(local, skb);
1496 }
1497
1498 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1499 {
1500 struct nfc_llcp_local *local;
1501
1502 local = nfc_llcp_find_local(dev);
1503 if (local == NULL)
1504 return -ENODEV;
1505
1506 __nfc_llcp_recv(local, skb);
1507
1508 return 0;
1509 }
1510
1511 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1512 {
1513 struct nfc_llcp_local *local;
1514
1515 local = nfc_llcp_find_local(dev);
1516 if (local == NULL)
1517 return;
1518
1519 local->remote_miu = LLCP_DEFAULT_MIU;
1520 local->remote_lto = LLCP_DEFAULT_LTO;
1521
1522 /* Close and purge all existing sockets */
1523 nfc_llcp_socket_release(local, true, 0);
1524 }
1525
1526 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1527 u8 comm_mode, u8 rf_mode)
1528 {
1529 struct nfc_llcp_local *local;
1530
1531 pr_debug("rf mode %d\n", rf_mode);
1532
1533 local = nfc_llcp_find_local(dev);
1534 if (local == NULL)
1535 return;
1536
1537 local->target_idx = target_idx;
1538 local->comm_mode = comm_mode;
1539 local->rf_mode = rf_mode;
1540
1541 if (rf_mode == NFC_RF_INITIATOR) {
1542 pr_debug("Queueing Tx work\n");
1543
1544 schedule_work(&local->tx_work);
1545 } else {
1546 mod_timer(&local->link_timer,
1547 jiffies + msecs_to_jiffies(local->remote_lto));
1548 }
1549 }
1550
1551 int nfc_llcp_register_device(struct nfc_dev *ndev)
1552 {
1553 struct nfc_llcp_local *local;
1554
1555 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1556 if (local == NULL)
1557 return -ENOMEM;
1558
1559 local->dev = ndev;
1560 INIT_LIST_HEAD(&local->list);
1561 kref_init(&local->ref);
1562 mutex_init(&local->sdp_lock);
1563 init_timer(&local->link_timer);
1564 local->link_timer.data = (unsigned long) local;
1565 local->link_timer.function = nfc_llcp_symm_timer;
1566
1567 skb_queue_head_init(&local->tx_queue);
1568 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1569
1570 local->rx_pending = NULL;
1571 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1572
1573 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1574
1575 rwlock_init(&local->sockets.lock);
1576 rwlock_init(&local->connecting_sockets.lock);
1577 rwlock_init(&local->raw_sockets.lock);
1578
1579 local->lto = 150; /* 1500 ms */
1580 local->rw = LLCP_MAX_RW;
1581 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1582
1583 nfc_llcp_build_gb(local);
1584
1585 local->remote_miu = LLCP_DEFAULT_MIU;
1586 local->remote_lto = LLCP_DEFAULT_LTO;
1587
1588 mutex_init(&local->sdreq_lock);
1589 INIT_HLIST_HEAD(&local->pending_sdreqs);
1590 init_timer(&local->sdreq_timer);
1591 local->sdreq_timer.data = (unsigned long) local;
1592 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1593 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1594
1595 list_add(&local->list, &llcp_devices);
1596
1597 return 0;
1598 }
1599
1600 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1601 {
1602 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1603
1604 if (local == NULL) {
1605 pr_debug("No such device\n");
1606 return;
1607 }
1608
1609 local_cleanup(local);
1610
1611 nfc_llcp_local_put(local);
1612 }
1613
1614 int __init nfc_llcp_init(void)
1615 {
1616 INIT_LIST_HEAD(&llcp_devices);
1617
1618 return nfc_llcp_sock_init();
1619 }
1620
1621 void nfc_llcp_exit(void)
1622 {
1623 nfc_llcp_sock_exit();
1624 }
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