blob: e69786c6804cdf83cd5b758bad3985afacb1a4b2 [file] [log] [blame]
Samuel Ortizd6469602011-12-14 16:43:12 +01001/*
2 * Copyright (C) 2011 Intel Corporation. All rights reserved.
Julien Lefrique966efbf2014-10-21 16:52:50 +02003 * Copyright (C) 2014 Marvell International Ltd.
Samuel Ortizd6469602011-12-14 16:43:12 +01004 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
Jeff Kirsher98b32de2013-12-06 08:56:16 -080016 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Samuel Ortizd6469602011-12-14 16:43:12 +010017 */
18
19#define pr_fmt(fmt) "llcp: %s: " fmt, __func__
20
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/list.h>
24#include <linux/nfc.h>
25
Samuel Ortiz30cc4582013-04-26 11:49:40 +020026#include "nfc.h"
Samuel Ortizd6469602011-12-14 16:43:12 +010027#include "llcp.h"
28
29static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
30
Axel Lin0b51fc52014-02-22 22:14:18 +080031static LIST_HEAD(llcp_devices);
Samuel Ortizd6469602011-12-14 16:43:12 +010032
Thierry Escande098dafc2013-03-29 11:47:43 +010033static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
34
Samuel Ortiza69f32a2012-05-04 17:04:19 +020035void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
36{
37 write_lock(&l->lock);
38 sk_add_node(sk, &l->head);
39 write_unlock(&l->lock);
40}
41
42void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
43{
44 write_lock(&l->lock);
45 sk_del_node_init(sk);
46 write_unlock(&l->lock);
47}
48
Thierry Escandeabd18d42013-04-02 10:25:15 +020049void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
50{
51 sock->remote_rw = LLCP_DEFAULT_RW;
52 sock->remote_miu = LLCP_MAX_MIU + 1;
53}
54
Samuel Ortizf31652a2012-10-26 18:20:10 +020055static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
56{
57 struct nfc_llcp_local *local = sock->local;
58 struct sk_buff *s, *tmp;
59
60 pr_debug("%p\n", &sock->sk);
61
62 skb_queue_purge(&sock->tx_queue);
63 skb_queue_purge(&sock->tx_pending_queue);
Samuel Ortizf31652a2012-10-26 18:20:10 +020064
65 if (local == NULL)
66 return;
67
68 /* Search for local pending SKBs that are related to this socket */
69 skb_queue_walk_safe(&local->tx_queue, s, tmp) {
70 if (s->sk != &sock->sk)
71 continue;
72
73 skb_unlink(s, &local->tx_queue);
74 kfree_skb(s);
75 }
76}
77
Samuel Ortizb436a132013-04-03 16:34:19 +020078static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +010079 int err)
Samuel Ortizd6469602011-12-14 16:43:12 +010080{
Samuel Ortiza69f32a2012-05-04 17:04:19 +020081 struct sock *sk;
Sasha Levinb67bfe02013-02-27 17:06:00 -080082 struct hlist_node *tmp;
Samuel Ortiza69f32a2012-05-04 17:04:19 +020083 struct nfc_llcp_sock *llcp_sock;
Samuel Ortizd6469602011-12-14 16:43:12 +010084
Samuel Ortizf31652a2012-10-26 18:20:10 +020085 skb_queue_purge(&local->tx_queue);
86
Samuel Ortiza69f32a2012-05-04 17:04:19 +020087 write_lock(&local->sockets.lock);
Samuel Ortizd6469602011-12-14 16:43:12 +010088
Sasha Levinb67bfe02013-02-27 17:06:00 -080089 sk_for_each_safe(sk, tmp, &local->sockets.head) {
Samuel Ortiza69f32a2012-05-04 17:04:19 +020090 llcp_sock = nfc_llcp_sock(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +010091
Szymon Janc50b78b22012-09-26 14:22:10 +020092 bh_lock_sock(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +010093
Samuel Ortizf31652a2012-10-26 18:20:10 +020094 nfc_llcp_socket_purge(llcp_sock);
95
Samuel Ortiza69f32a2012-05-04 17:04:19 +020096 if (sk->sk_state == LLCP_CONNECTED)
97 nfc_put_device(llcp_sock->dev);
Samuel Ortizd6469602011-12-14 16:43:12 +010098
Samuel Ortiza69f32a2012-05-04 17:04:19 +020099 if (sk->sk_state == LLCP_LISTEN) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100100 struct nfc_llcp_sock *lsk, *n;
101 struct sock *accept_sk;
102
Szymon Janc0f450772012-10-17 15:23:39 +0200103 list_for_each_entry_safe(lsk, n,
104 &llcp_sock->accept_queue,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100105 accept_queue) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100106 accept_sk = &lsk->sk;
Szymon Janc50b78b22012-09-26 14:22:10 +0200107 bh_lock_sock(accept_sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100108
109 nfc_llcp_accept_unlink(accept_sk);
110
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +0100111 if (err)
112 accept_sk->sk_err = err;
Samuel Ortizd6469602011-12-14 16:43:12 +0100113 accept_sk->sk_state = LLCP_CLOSED;
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +0100114 accept_sk->sk_state_change(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100115
Szymon Janc50b78b22012-09-26 14:22:10 +0200116 bh_unlock_sock(accept_sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100117 }
Samuel Ortizc8512be2012-10-15 15:09:52 +0200118 }
119
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +0100120 if (err)
121 sk->sk_err = err;
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200122 sk->sk_state = LLCP_CLOSED;
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +0100123 sk->sk_state_change(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100124
Szymon Janc50b78b22012-09-26 14:22:10 +0200125 bh_unlock_sock(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100126
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200127 sk_del_node_init(sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100128 }
129
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200130 write_unlock(&local->sockets.lock);
Samuel Ortize6a3a4b2013-02-21 16:33:30 +0100131
Samuel Ortizb436a132013-04-03 16:34:19 +0200132 /* If we still have a device, we keep the RAW sockets alive */
133 if (device == true)
Samuel Ortize6a3a4b2013-02-21 16:33:30 +0100134 return;
135
136 write_lock(&local->raw_sockets.lock);
137
138 sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
139 llcp_sock = nfc_llcp_sock(sk);
140
141 bh_lock_sock(sk);
142
143 nfc_llcp_socket_purge(llcp_sock);
144
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +0100145 if (err)
146 sk->sk_err = err;
Samuel Ortize6a3a4b2013-02-21 16:33:30 +0100147 sk->sk_state = LLCP_CLOSED;
Samuel Ortize6a3a4b2013-02-21 16:33:30 +0100148 sk->sk_state_change(sk);
149
150 bh_unlock_sock(sk);
151
Samuel Ortize6a3a4b2013-02-21 16:33:30 +0100152 sk_del_node_init(sk);
153 }
154
155 write_unlock(&local->raw_sockets.lock);
Samuel Ortizd6469602011-12-14 16:43:12 +0100156}
157
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200158struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
159{
160 kref_get(&local->ref);
161
162 return local;
163}
164
Samuel Ortizc470e312013-04-03 16:40:52 +0200165static void local_cleanup(struct nfc_llcp_local *local)
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200166{
Samuel Ortizc470e312013-04-03 16:40:52 +0200167 nfc_llcp_socket_release(local, false, ENXIO);
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200168 del_timer_sync(&local->link_timer);
169 skb_queue_purge(&local->tx_queue);
Tejun Heo474fee32012-08-22 16:22:16 -0700170 cancel_work_sync(&local->tx_work);
171 cancel_work_sync(&local->rx_work);
172 cancel_work_sync(&local->timeout_work);
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200173 kfree_skb(local->rx_pending);
Thierry Escande40213fa2013-03-04 15:43:32 +0100174 del_timer_sync(&local->sdreq_timer);
175 cancel_work_sync(&local->sdreq_timeout_work);
Thierry Escanded9b8d8e2013-02-15 10:43:06 +0100176 nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
Samuel Ortiz3536da02013-02-21 15:40:04 +0100177}
178
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200179static void local_release(struct kref *ref)
180{
181 struct nfc_llcp_local *local;
182
183 local = container_of(ref, struct nfc_llcp_local, ref);
184
185 list_del(&local->list);
Samuel Ortizc470e312013-04-03 16:40:52 +0200186 local_cleanup(local);
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200187 kfree(local);
188}
189
190int nfc_llcp_local_put(struct nfc_llcp_local *local)
191{
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200192 if (local == NULL)
193 return 0;
194
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200195 return kref_put(&local->ref, local_release);
196}
197
Samuel Ortiz8f500202012-06-25 15:46:28 +0200198static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
199 u8 ssap, u8 dsap)
200{
201 struct sock *sk;
Samuel Ortiza8df0f32012-10-16 21:15:59 +0200202 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
Samuel Ortiz8f500202012-06-25 15:46:28 +0200203
204 pr_debug("ssap dsap %d %d\n", ssap, dsap);
205
206 if (ssap == 0 && dsap == 0)
207 return NULL;
208
209 read_lock(&local->sockets.lock);
210
211 llcp_sock = NULL;
212
Sasha Levinb67bfe02013-02-27 17:06:00 -0800213 sk_for_each(sk, &local->sockets.head) {
Samuel Ortiza8df0f32012-10-16 21:15:59 +0200214 tmp_sock = nfc_llcp_sock(sk);
Samuel Ortiz8f500202012-06-25 15:46:28 +0200215
Samuel Ortiza8df0f32012-10-16 21:15:59 +0200216 if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
217 llcp_sock = tmp_sock;
Samuel Ortiz8f500202012-06-25 15:46:28 +0200218 break;
Samuel Ortiza8df0f32012-10-16 21:15:59 +0200219 }
Samuel Ortiz8f500202012-06-25 15:46:28 +0200220 }
221
222 read_unlock(&local->sockets.lock);
223
224 if (llcp_sock == NULL)
225 return NULL;
226
227 sock_hold(&llcp_sock->sk);
228
229 return llcp_sock;
230}
231
232static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
233{
234 sock_put(&sock->sk);
235}
236
Samuel Ortizd6469602011-12-14 16:43:12 +0100237static void nfc_llcp_timeout_work(struct work_struct *work)
238{
239 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100240 timeout_work);
Samuel Ortizd6469602011-12-14 16:43:12 +0100241
242 nfc_dep_link_down(local->dev);
243}
244
245static void nfc_llcp_symm_timer(unsigned long data)
246{
247 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
248
249 pr_err("SYMM timeout\n");
250
Linus Torvalds916082b2012-10-02 16:01:31 -0700251 schedule_work(&local->timeout_work);
Samuel Ortizd6469602011-12-14 16:43:12 +0100252}
253
Thierry Escande40213fa2013-03-04 15:43:32 +0100254static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
255{
256 unsigned long time;
257 HLIST_HEAD(nl_sdres_list);
258 struct hlist_node *n;
259 struct nfc_llcp_sdp_tlv *sdp;
260 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
261 sdreq_timeout_work);
262
263 mutex_lock(&local->sdreq_lock);
264
265 time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
266
267 hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
268 if (time_after(sdp->time, time))
269 continue;
270
271 sdp->sap = LLCP_SDP_UNBOUND;
272
273 hlist_del(&sdp->node);
274
275 hlist_add_head(&sdp->node, &nl_sdres_list);
276 }
277
278 if (!hlist_empty(&local->pending_sdreqs))
279 mod_timer(&local->sdreq_timer,
280 jiffies + msecs_to_jiffies(3 * local->remote_lto));
281
282 mutex_unlock(&local->sdreq_lock);
283
284 if (!hlist_empty(&nl_sdres_list))
285 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
286}
287
288static void nfc_llcp_sdreq_timer(unsigned long data)
289{
290 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
291
292 schedule_work(&local->sdreq_timeout_work);
293}
294
Samuel Ortizd6469602011-12-14 16:43:12 +0100295struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
296{
Axel Lin29e27dd2014-02-26 10:26:45 +0800297 struct nfc_llcp_local *local;
Samuel Ortizd6469602011-12-14 16:43:12 +0100298
Axel Lin29e27dd2014-02-26 10:26:45 +0800299 list_for_each_entry(local, &llcp_devices, list)
Samuel Ortizd6469602011-12-14 16:43:12 +0100300 if (local->dev == dev)
301 return local;
302
303 pr_debug("No device found\n");
304
305 return NULL;
306}
307
308static char *wks[] = {
309 NULL,
310 NULL, /* SDP */
311 "urn:nfc:sn:ip",
312 "urn:nfc:sn:obex",
313 "urn:nfc:sn:snep",
314};
315
316static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len)
317{
318 int sap, num_wks;
319
320 pr_debug("%s\n", service_name);
321
322 if (service_name == NULL)
323 return -EINVAL;
324
325 num_wks = ARRAY_SIZE(wks);
326
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100327 for (sap = 0; sap < num_wks; sap++) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100328 if (wks[sap] == NULL)
329 continue;
330
331 if (strncmp(wks[sap], service_name, service_name_len) == 0)
332 return sap;
333 }
334
335 return -EINVAL;
336}
337
Samuel Ortiz8f500202012-06-25 15:46:28 +0200338static
339struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
340 u8 *sn, size_t sn_len)
341{
342 struct sock *sk;
Samuel Ortiz8f500202012-06-25 15:46:28 +0200343 struct nfc_llcp_sock *llcp_sock, *tmp_sock;
344
345 pr_debug("sn %zd %p\n", sn_len, sn);
346
347 if (sn == NULL || sn_len == 0)
348 return NULL;
349
350 read_lock(&local->sockets.lock);
351
352 llcp_sock = NULL;
353
Sasha Levinb67bfe02013-02-27 17:06:00 -0800354 sk_for_each(sk, &local->sockets.head) {
Samuel Ortiz8f500202012-06-25 15:46:28 +0200355 tmp_sock = nfc_llcp_sock(sk);
356
357 pr_debug("llcp sock %p\n", tmp_sock);
358
Samuel Ortiz54292d62012-10-15 15:08:29 +0200359 if (tmp_sock->sk.sk_type == SOCK_STREAM &&
360 tmp_sock->sk.sk_state != LLCP_LISTEN)
361 continue;
362
363 if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
364 tmp_sock->sk.sk_state != LLCP_BOUND)
Samuel Ortiz8f500202012-06-25 15:46:28 +0200365 continue;
366
367 if (tmp_sock->service_name == NULL ||
368 tmp_sock->service_name_len == 0)
369 continue;
370
371 if (tmp_sock->service_name_len != sn_len)
372 continue;
373
374 if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
375 llcp_sock = tmp_sock;
376 break;
377 }
378 }
379
380 read_unlock(&local->sockets.lock);
381
382 pr_debug("Found llcp sock %p\n", llcp_sock);
383
384 return llcp_sock;
385}
386
Samuel Ortizd6469602011-12-14 16:43:12 +0100387u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100388 struct nfc_llcp_sock *sock)
Samuel Ortizd6469602011-12-14 16:43:12 +0100389{
390 mutex_lock(&local->sdp_lock);
391
392 if (sock->service_name != NULL && sock->service_name_len > 0) {
393 int ssap = nfc_llcp_wks_sap(sock->service_name,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100394 sock->service_name_len);
Samuel Ortizd6469602011-12-14 16:43:12 +0100395
396 if (ssap > 0) {
397 pr_debug("WKS %d\n", ssap);
398
399 /* This is a WKS, let's check if it's free */
400 if (local->local_wks & BIT(ssap)) {
401 mutex_unlock(&local->sdp_lock);
402
403 return LLCP_SAP_MAX;
404 }
405
Samuel Ortiz1762c172012-03-05 01:03:38 +0100406 set_bit(ssap, &local->local_wks);
Samuel Ortizd6469602011-12-14 16:43:12 +0100407 mutex_unlock(&local->sdp_lock);
408
409 return ssap;
410 }
411
412 /*
Samuel Ortiz8f500202012-06-25 15:46:28 +0200413 * Check if there already is a non WKS socket bound
414 * to this service name.
Samuel Ortizd6469602011-12-14 16:43:12 +0100415 */
Samuel Ortiz8f500202012-06-25 15:46:28 +0200416 if (nfc_llcp_sock_from_sn(local, sock->service_name,
417 sock->service_name_len) != NULL) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100418 mutex_unlock(&local->sdp_lock);
419
420 return LLCP_SAP_MAX;
421 }
422
Samuel Ortizd6469602011-12-14 16:43:12 +0100423 mutex_unlock(&local->sdp_lock);
424
Samuel Ortiz8f500202012-06-25 15:46:28 +0200425 return LLCP_SDP_UNBOUND;
Samuel Ortizd6469602011-12-14 16:43:12 +0100426
Samuel Ortizebbb16d2012-06-22 17:15:20 +0200427 } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
428 if (!test_bit(sock->ssap, &local->local_wks)) {
429 set_bit(sock->ssap, &local->local_wks);
430 mutex_unlock(&local->sdp_lock);
Samuel Ortizd6469602011-12-14 16:43:12 +0100431
Samuel Ortizebbb16d2012-06-22 17:15:20 +0200432 return sock->ssap;
Samuel Ortizd6469602011-12-14 16:43:12 +0100433 }
434 }
435
436 mutex_unlock(&local->sdp_lock);
437
438 return LLCP_SAP_MAX;
439}
440
441u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
442{
443 u8 local_ssap;
444
445 mutex_lock(&local->sdp_lock);
446
447 local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
448 if (local_ssap == LLCP_LOCAL_NUM_SAP) {
449 mutex_unlock(&local->sdp_lock);
450 return LLCP_SAP_MAX;
451 }
452
Samuel Ortiz1762c172012-03-05 01:03:38 +0100453 set_bit(local_ssap, &local->local_sap);
Samuel Ortizd6469602011-12-14 16:43:12 +0100454
455 mutex_unlock(&local->sdp_lock);
456
457 return local_ssap + LLCP_LOCAL_SAP_OFFSET;
458}
459
460void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
461{
462 u8 local_ssap;
463 unsigned long *sdp;
464
465 if (ssap < LLCP_WKS_NUM_SAP) {
466 local_ssap = ssap;
467 sdp = &local->local_wks;
468 } else if (ssap < LLCP_LOCAL_NUM_SAP) {
Samuel Ortiz8f500202012-06-25 15:46:28 +0200469 atomic_t *client_cnt;
470
Samuel Ortizd6469602011-12-14 16:43:12 +0100471 local_ssap = ssap - LLCP_WKS_NUM_SAP;
472 sdp = &local->local_sdp;
Samuel Ortiz8f500202012-06-25 15:46:28 +0200473 client_cnt = &local->local_sdp_cnt[local_ssap];
474
475 pr_debug("%d clients\n", atomic_read(client_cnt));
476
477 mutex_lock(&local->sdp_lock);
478
479 if (atomic_dec_and_test(client_cnt)) {
480 struct nfc_llcp_sock *l_sock;
481
482 pr_debug("No more clients for SAP %d\n", ssap);
483
484 clear_bit(local_ssap, sdp);
485
486 /* Find the listening sock and set it back to UNBOUND */
487 l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
488 if (l_sock) {
489 l_sock->ssap = LLCP_SDP_UNBOUND;
490 nfc_llcp_sock_put(l_sock);
491 }
492 }
493
494 mutex_unlock(&local->sdp_lock);
495
496 return;
Samuel Ortizd6469602011-12-14 16:43:12 +0100497 } else if (ssap < LLCP_MAX_SAP) {
498 local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
499 sdp = &local->local_sap;
500 } else {
501 return;
502 }
503
504 mutex_lock(&local->sdp_lock);
505
Samuel Ortiz1762c172012-03-05 01:03:38 +0100506 clear_bit(local_ssap, sdp);
Samuel Ortizd6469602011-12-14 16:43:12 +0100507
508 mutex_unlock(&local->sdp_lock);
509}
510
Samuel Ortiz8f500202012-06-25 15:46:28 +0200511static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
512{
513 u8 ssap;
514
515 mutex_lock(&local->sdp_lock);
516
517 ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
518 if (ssap == LLCP_SDP_NUM_SAP) {
519 mutex_unlock(&local->sdp_lock);
520
521 return LLCP_SAP_MAX;
522 }
523
524 pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
525
526 set_bit(ssap, &local->local_sdp);
527
528 mutex_unlock(&local->sdp_lock);
529
530 return LLCP_WKS_NUM_SAP + ssap;
531}
532
Samuel Ortizd6469602011-12-14 16:43:12 +0100533static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
534{
535 u8 *gb_cur, *version_tlv, version, version_length;
Thierry Escande52feb442012-10-17 14:43:39 +0200536 u8 *lto_tlv, lto_length;
Samuel Ortizd6469602011-12-14 16:43:12 +0100537 u8 *wks_tlv, wks_length;
Samuel Ortiz56d58762012-04-10 19:43:19 +0200538 u8 *miux_tlv, miux_length;
Samuel Ortiz4ca546e2013-06-03 12:10:04 +0200539 __be16 wks = cpu_to_be16(local->local_wks);
Samuel Ortizd6469602011-12-14 16:43:12 +0100540 u8 gb_len = 0;
Wei Yongjun52da2442012-09-02 21:21:46 +0800541 int ret = 0;
Samuel Ortizd6469602011-12-14 16:43:12 +0100542
543 version = LLCP_VERSION_11;
544 version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100545 1, &version_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100546 gb_len += version_length;
547
Thierry Escande52feb442012-10-17 14:43:39 +0200548 lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100549 gb_len += lto_length;
550
551 pr_debug("Local wks 0x%lx\n", local->local_wks);
Samuel Ortiz4ca546e2013-06-03 12:10:04 +0200552 wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100553 gb_len += wks_length;
554
Thierry Escande52feb442012-10-17 14:43:39 +0200555 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
Samuel Ortiz56d58762012-04-10 19:43:19 +0200556 &miux_length);
557 gb_len += miux_length;
558
Samuel Ortizd6469602011-12-14 16:43:12 +0100559 gb_len += ARRAY_SIZE(llcp_magic);
560
561 if (gb_len > NFC_MAX_GT_LEN) {
Wei Yongjun52da2442012-09-02 21:21:46 +0800562 ret = -EINVAL;
563 goto out;
Samuel Ortizd6469602011-12-14 16:43:12 +0100564 }
565
566 gb_cur = local->gb;
567
568 memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
569 gb_cur += ARRAY_SIZE(llcp_magic);
570
571 memcpy(gb_cur, version_tlv, version_length);
572 gb_cur += version_length;
573
574 memcpy(gb_cur, lto_tlv, lto_length);
575 gb_cur += lto_length;
576
577 memcpy(gb_cur, wks_tlv, wks_length);
578 gb_cur += wks_length;
579
Samuel Ortiz56d58762012-04-10 19:43:19 +0200580 memcpy(gb_cur, miux_tlv, miux_length);
581 gb_cur += miux_length;
582
Samuel Ortizd6469602011-12-14 16:43:12 +0100583 local->gb_len = gb_len;
584
Wei Yongjun52da2442012-09-02 21:21:46 +0800585out:
586 kfree(version_tlv);
587 kfree(lto_tlv);
588 kfree(wks_tlv);
589 kfree(miux_tlv);
590
591 return ret;
Samuel Ortizd6469602011-12-14 16:43:12 +0100592}
593
Samuel Ortizb8e7a062012-06-22 02:04:53 +0200594u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
595{
596 struct nfc_llcp_local *local;
597
598 local = nfc_llcp_find_local(dev);
599 if (local == NULL) {
600 *general_bytes_len = 0;
601 return NULL;
602 }
603
604 nfc_llcp_build_gb(local);
605
606 *general_bytes_len = local->gb_len;
607
608 return local->gb;
609}
610
Samuel Ortizd6469602011-12-14 16:43:12 +0100611int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len)
612{
Axel Lin3143a4c2014-02-25 09:18:10 +0800613 struct nfc_llcp_local *local;
Samuel Ortizd6469602011-12-14 16:43:12 +0100614
Axel Lin3143a4c2014-02-25 09:18:10 +0800615 if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
616 return -EINVAL;
617
618 local = nfc_llcp_find_local(dev);
Samuel Ortizd6469602011-12-14 16:43:12 +0100619 if (local == NULL) {
620 pr_err("No LLCP device\n");
621 return -ENODEV;
622 }
623
624 memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
625 memcpy(local->remote_gb, gb, gb_len);
626 local->remote_gb_len = gb_len;
627
Samuel Ortizd6469602011-12-14 16:43:12 +0100628 if (memcmp(local->remote_gb, llcp_magic, 3)) {
629 pr_err("MAC does not support LLCP\n");
630 return -EINVAL;
631 }
632
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200633 return nfc_llcp_parse_gb_tlv(local,
634 &local->remote_gb[3],
635 local->remote_gb_len - 3);
Samuel Ortizd6469602011-12-14 16:43:12 +0100636}
637
Samuel Ortizd6469602011-12-14 16:43:12 +0100638static u8 nfc_llcp_dsap(struct sk_buff *pdu)
639{
640 return (pdu->data[0] & 0xfc) >> 2;
641}
642
643static u8 nfc_llcp_ptype(struct sk_buff *pdu)
644{
645 return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
646}
647
648static u8 nfc_llcp_ssap(struct sk_buff *pdu)
649{
650 return pdu->data[1] & 0x3f;
651}
652
653static u8 nfc_llcp_ns(struct sk_buff *pdu)
654{
655 return pdu->data[2] >> 4;
656}
657
658static u8 nfc_llcp_nr(struct sk_buff *pdu)
659{
660 return pdu->data[2] & 0xf;
661}
662
663static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
664{
Samuel Ortiz279cf172012-04-10 19:43:14 +0200665 pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
Samuel Ortizd6469602011-12-14 16:43:12 +0100666 sock->send_n = (sock->send_n + 1) % 16;
667 sock->recv_ack_n = (sock->recv_n - 1) % 16;
668}
669
Thierry Escande4463523b2012-09-26 18:16:44 +0200670void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
671 struct sk_buff *skb, u8 direction)
672{
Thierry Escande4463523b2012-09-26 18:16:44 +0200673 struct sk_buff *skb_copy = NULL, *nskb;
674 struct sock *sk;
675 u8 *data;
676
677 read_lock(&local->raw_sockets.lock);
678
Sasha Levinb67bfe02013-02-27 17:06:00 -0800679 sk_for_each(sk, &local->raw_sockets.head) {
Thierry Escande4463523b2012-09-26 18:16:44 +0200680 if (sk->sk_state != LLCP_BOUND)
681 continue;
682
683 if (skb_copy == NULL) {
Octavian Purdilabad93e92014-06-12 01:36:26 +0300684 skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
685 GFP_ATOMIC, true);
Thierry Escande4463523b2012-09-26 18:16:44 +0200686
687 if (skb_copy == NULL)
688 continue;
689
Hiren Tandel57be1f32014-05-05 19:43:31 +0900690 data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
Thierry Escande4463523b2012-09-26 18:16:44 +0200691
692 data[0] = local->dev ? local->dev->idx : 0xFF;
Hiren Tandel57be1f32014-05-05 19:43:31 +0900693 data[1] = direction & 0x01;
694 data[1] |= (RAW_PAYLOAD_LLCP << 1);
Thierry Escande4463523b2012-09-26 18:16:44 +0200695 }
696
697 nskb = skb_clone(skb_copy, GFP_ATOMIC);
698 if (!nskb)
699 continue;
700
701 if (sock_queue_rcv_skb(sk, nskb))
702 kfree_skb(nskb);
703 }
704
705 read_unlock(&local->raw_sockets.lock);
706
707 kfree_skb(skb_copy);
708}
709
Samuel Ortiz84457962012-05-30 17:48:29 +0200710static void nfc_llcp_tx_work(struct work_struct *work)
711{
712 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
713 tx_work);
714 struct sk_buff *skb;
715 struct sock *sk;
716 struct nfc_llcp_sock *llcp_sock;
717
718 skb = skb_dequeue(&local->tx_queue);
719 if (skb != NULL) {
720 sk = skb->sk;
721 llcp_sock = nfc_llcp_sock(sk);
Samuel Ortiza6a09152012-10-05 00:37:22 +0200722
723 if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
Thierry Escandef1b79dc2013-06-05 17:15:59 +0200724 kfree_skb(skb);
Samuel Ortiza6a09152012-10-05 00:37:22 +0200725 nfc_llcp_send_symm(local->dev);
Samuel Ortiz2635a4b2013-05-28 15:03:17 +0200726 } else if (llcp_sock && !llcp_sock->remote_ready) {
727 skb_queue_head(&local->tx_queue, skb);
728 nfc_llcp_send_symm(local->dev);
Samuel Ortiza6a09152012-10-05 00:37:22 +0200729 } else {
Samuel Ortizbe02b6b2012-11-01 23:36:07 +0100730 struct sk_buff *copy_skb = NULL;
731 u8 ptype = nfc_llcp_ptype(skb);
Samuel Ortiz84457962012-05-30 17:48:29 +0200732 int ret;
733
734 pr_debug("Sending pending skb\n");
Thierry Escande806bfe32016-06-07 16:21:53 +0200735 print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
736 16, 1, skb->data, skb->len, true);
Samuel Ortiz84457962012-05-30 17:48:29 +0200737
Thierry Escande17f7ae162013-06-04 11:34:51 +0200738 if (ptype == LLCP_PDU_DISC && sk != NULL &&
739 sk->sk_state == LLCP_DISCONNECTING) {
740 nfc_llcp_sock_unlink(&local->sockets, sk);
741 sock_orphan(sk);
742 sock_put(sk);
743 }
744
Samuel Ortizbe02b6b2012-11-01 23:36:07 +0100745 if (ptype == LLCP_PDU_I)
746 copy_skb = skb_copy(skb, GFP_ATOMIC);
747
Thierry Escande2c2d45b2012-11-27 15:44:24 +0100748 __net_timestamp(skb);
749
Thierry Escande4463523b2012-09-26 18:16:44 +0200750 nfc_llcp_send_to_raw_sock(local, skb,
Hiren Tandel57be1f32014-05-05 19:43:31 +0900751 NFC_DIRECTION_TX);
Thierry Escande4463523b2012-09-26 18:16:44 +0200752
Samuel Ortiz84457962012-05-30 17:48:29 +0200753 ret = nfc_data_exchange(local->dev, local->target_idx,
754 skb, nfc_llcp_recv, local);
755
Samuel Ortizbe02b6b2012-11-01 23:36:07 +0100756 if (ret) {
757 kfree_skb(copy_skb);
758 goto out;
Samuel Ortiz84457962012-05-30 17:48:29 +0200759 }
Samuel Ortizbe02b6b2012-11-01 23:36:07 +0100760
761 if (ptype == LLCP_PDU_I && copy_skb)
762 skb_queue_tail(&llcp_sock->tx_pending_queue,
763 copy_skb);
Samuel Ortiz84457962012-05-30 17:48:29 +0200764 }
765 } else {
766 nfc_llcp_send_symm(local->dev);
767 }
768
Samuel Ortizbe02b6b2012-11-01 23:36:07 +0100769out:
Samuel Ortiz84457962012-05-30 17:48:29 +0200770 mod_timer(&local->link_timer,
771 jiffies + msecs_to_jiffies(2 * local->remote_lto));
772}
773
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200774static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
775 u8 ssap)
776{
777 struct sock *sk;
778 struct nfc_llcp_sock *llcp_sock;
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200779
780 read_lock(&local->connecting_sockets.lock);
781
Sasha Levinb67bfe02013-02-27 17:06:00 -0800782 sk_for_each(sk, &local->connecting_sockets.head) {
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200783 llcp_sock = nfc_llcp_sock(sk);
784
Samuel Ortiz5a0f6f32012-05-21 11:44:42 +0200785 if (llcp_sock->ssap == ssap) {
786 sock_hold(&llcp_sock->sk);
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200787 goto out;
Samuel Ortiz5a0f6f32012-05-21 11:44:42 +0200788 }
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200789 }
790
791 llcp_sock = NULL;
792
793out:
794 read_unlock(&local->connecting_sockets.lock);
795
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200796 return llcp_sock;
797}
798
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200799static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
800 u8 *sn, size_t sn_len)
801{
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200802 struct nfc_llcp_sock *llcp_sock;
803
Samuel Ortiz8f500202012-06-25 15:46:28 +0200804 llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
Samuel Ortizd6469602011-12-14 16:43:12 +0100805
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200806 if (llcp_sock == NULL)
807 return NULL;
Samuel Ortizd6469602011-12-14 16:43:12 +0100808
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200809 sock_hold(&llcp_sock->sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100810
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200811 return llcp_sock;
Samuel Ortizd6469602011-12-14 16:43:12 +0100812}
813
Samuel Ortizd6469602011-12-14 16:43:12 +0100814static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len)
815{
816 u8 *tlv = &skb->data[2], type, length;
817 size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
818
819 while (offset < tlv_array_len) {
820 type = tlv[0];
821 length = tlv[1];
822
823 pr_debug("type 0x%x length %d\n", type, length);
824
825 if (type == LLCP_TLV_SN) {
826 *sn_len = length;
827 return &tlv[2];
828 }
829
830 offset += length + 2;
831 tlv += length + 2;
832 }
833
834 return NULL;
835}
836
Samuel Ortiz968272b2012-10-15 16:14:37 +0200837static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
838 struct sk_buff *skb)
839{
840 struct nfc_llcp_sock *llcp_sock;
841 struct nfc_llcp_ui_cb *ui_cb;
842 u8 dsap, ssap;
843
844 dsap = nfc_llcp_dsap(skb);
845 ssap = nfc_llcp_ssap(skb);
846
847 ui_cb = nfc_llcp_ui_skb_cb(skb);
848 ui_cb->dsap = dsap;
849 ui_cb->ssap = ssap;
850
Samuel Ortiz968272b2012-10-15 16:14:37 +0200851 pr_debug("%d %d\n", dsap, ssap);
852
853 /* We're looking for a bound socket, not a client one */
854 llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
855 if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
856 return;
857
858 /* There is no sequence with UI frames */
859 skb_pull(skb, LLCP_HEADER_SIZE);
Samuel Ortiz1727cf92012-12-07 16:37:30 +0100860 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
861 /*
862 * UI frames will be freed from the socket layer, so we
863 * need to keep them alive until someone receives them.
864 */
865 skb_get(skb);
866 } else {
867 pr_err("Receive queue is full\n");
Samuel Ortiz968272b2012-10-15 16:14:37 +0200868 }
869
870 nfc_llcp_sock_put(llcp_sock);
871}
872
Samuel Ortizd6469602011-12-14 16:43:12 +0100873static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100874 struct sk_buff *skb)
Samuel Ortizd6469602011-12-14 16:43:12 +0100875{
876 struct sock *new_sk, *parent;
877 struct nfc_llcp_sock *sock, *new_sock;
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200878 u8 dsap, ssap, reason;
Samuel Ortizd6469602011-12-14 16:43:12 +0100879
880 dsap = nfc_llcp_dsap(skb);
881 ssap = nfc_llcp_ssap(skb);
882
883 pr_debug("%d %d\n", dsap, ssap);
884
Samuel Ortizd6469602011-12-14 16:43:12 +0100885 if (dsap != LLCP_SAP_SDP) {
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200886 sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
887 if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100888 reason = LLCP_DM_NOBOUND;
889 goto fail;
890 }
Samuel Ortizd6469602011-12-14 16:43:12 +0100891 } else {
892 u8 *sn;
893 size_t sn_len;
894
895 sn = nfc_llcp_connect_sn(skb, &sn_len);
896 if (sn == NULL) {
897 reason = LLCP_DM_NOBOUND;
898 goto fail;
899 }
900
901 pr_debug("Service name length %zu\n", sn_len);
902
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200903 sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
904 if (sock == NULL) {
905 reason = LLCP_DM_NOBOUND;
906 goto fail;
Samuel Ortizd6469602011-12-14 16:43:12 +0100907 }
Samuel Ortizd6469602011-12-14 16:43:12 +0100908 }
909
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200910 lock_sock(&sock->sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100911
Samuel Ortizd6469602011-12-14 16:43:12 +0100912 parent = &sock->sk;
913
914 if (sk_acceptq_is_full(parent)) {
915 reason = LLCP_DM_REJ;
916 release_sock(&sock->sk);
917 sock_put(&sock->sk);
918 goto fail;
919 }
920
Samuel Ortiz8f500202012-06-25 15:46:28 +0200921 if (sock->ssap == LLCP_SDP_UNBOUND) {
922 u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
923
924 pr_debug("First client, reserving %d\n", ssap);
925
926 if (ssap == LLCP_SAP_MAX) {
927 reason = LLCP_DM_REJ;
928 release_sock(&sock->sk);
929 sock_put(&sock->sk);
930 goto fail;
931 }
932
933 sock->ssap = ssap;
934 }
935
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500936 new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
Samuel Ortizd6469602011-12-14 16:43:12 +0100937 if (new_sk == NULL) {
938 reason = LLCP_DM_REJ;
939 release_sock(&sock->sk);
940 sock_put(&sock->sk);
941 goto fail;
942 }
943
944 new_sock = nfc_llcp_sock(new_sk);
945 new_sock->dev = local->dev;
Samuel Ortizc7aa1222012-05-04 11:24:16 +0200946 new_sock->local = nfc_llcp_local_get(local);
Samuel Ortiz06d44f82013-02-22 11:38:05 +0100947 new_sock->rw = sock->rw;
948 new_sock->miux = sock->miux;
Samuel Ortizd6469602011-12-14 16:43:12 +0100949 new_sock->nfc_protocol = sock->nfc_protocol;
Samuel Ortizd6469602011-12-14 16:43:12 +0100950 new_sock->dsap = ssap;
Samuel Ortiz025f1522012-06-18 21:38:09 +0200951 new_sock->target_idx = local->target_idx;
Samuel Ortizd6469602011-12-14 16:43:12 +0100952 new_sock->parent = parent;
Samuel Ortiz8f500202012-06-25 15:46:28 +0200953 new_sock->ssap = sock->ssap;
954 if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
955 atomic_t *client_count;
956
957 pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
958
959 client_count =
960 &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
961
962 atomic_inc(client_count);
963 new_sock->reserved_ssap = sock->ssap;
964 }
Samuel Ortizd6469602011-12-14 16:43:12 +0100965
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200966 nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
967 skb->len - LLCP_HEADER_SIZE);
968
Samuel Ortizd6469602011-12-14 16:43:12 +0100969 pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
970
Samuel Ortiza69f32a2012-05-04 17:04:19 +0200971 nfc_llcp_sock_link(&local->sockets, new_sk);
Samuel Ortizd6469602011-12-14 16:43:12 +0100972
973 nfc_llcp_accept_enqueue(&sock->sk, new_sk);
974
975 nfc_get_device(local->dev->idx);
976
977 new_sk->sk_state = LLCP_CONNECTED;
978
979 /* Wake the listening processes */
David S. Miller676d2362014-04-11 16:15:36 -0400980 parent->sk_data_ready(parent);
Samuel Ortizd6469602011-12-14 16:43:12 +0100981
982 /* Send CC */
983 nfc_llcp_send_cc(new_sock);
984
985 release_sock(&sock->sk);
986 sock_put(&sock->sk);
987
988 return;
989
990fail:
991 /* Send DM */
992 nfc_llcp_send_dm(local, dsap, ssap, reason);
Samuel Ortizd6469602011-12-14 16:43:12 +0100993}
994
Samuel Ortizd094afa2012-03-05 01:03:42 +0100995int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
Samuel Ortiz4722d2b2012-03-05 01:03:35 +0100996{
Samuel Ortizd094afa2012-03-05 01:03:42 +0100997 int nr_frames = 0;
Samuel Ortiz4722d2b2012-03-05 01:03:35 +0100998 struct nfc_llcp_local *local = sock->local;
999
1000 pr_debug("Remote ready %d tx queue len %d remote rw %d",
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001001 sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
Samuel Ortize4306be2013-02-22 01:12:28 +01001002 sock->remote_rw);
Samuel Ortiz4722d2b2012-03-05 01:03:35 +01001003
1004 /* Try to queue some I frames for transmission */
1005 while (sock->remote_ready &&
Samuel Ortize4306be2013-02-22 01:12:28 +01001006 skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
Samuel Ortiz84457962012-05-30 17:48:29 +02001007 struct sk_buff *pdu;
Samuel Ortiz4722d2b2012-03-05 01:03:35 +01001008
1009 pdu = skb_dequeue(&sock->tx_queue);
1010 if (pdu == NULL)
1011 break;
1012
1013 /* Update N(S)/N(R) */
1014 nfc_llcp_set_nrns(sock, pdu);
1015
Samuel Ortiz4722d2b2012-03-05 01:03:35 +01001016 skb_queue_tail(&local->tx_queue, pdu);
Samuel Ortizd094afa2012-03-05 01:03:42 +01001017 nr_frames++;
Samuel Ortiz4722d2b2012-03-05 01:03:35 +01001018 }
Samuel Ortizd094afa2012-03-05 01:03:42 +01001019
1020 return nr_frames;
Samuel Ortiz4722d2b2012-03-05 01:03:35 +01001021}
1022
Samuel Ortizd6469602011-12-14 16:43:12 +01001023static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001024 struct sk_buff *skb)
Samuel Ortizd6469602011-12-14 16:43:12 +01001025{
1026 struct nfc_llcp_sock *llcp_sock;
1027 struct sock *sk;
1028 u8 dsap, ssap, ptype, ns, nr;
1029
1030 ptype = nfc_llcp_ptype(skb);
1031 dsap = nfc_llcp_dsap(skb);
1032 ssap = nfc_llcp_ssap(skb);
1033 ns = nfc_llcp_ns(skb);
1034 nr = nfc_llcp_nr(skb);
1035
1036 pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1037
1038 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1039 if (llcp_sock == NULL) {
1040 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1041 return;
1042 }
1043
1044 sk = &llcp_sock->sk;
1045 lock_sock(sk);
1046 if (sk->sk_state == LLCP_CLOSED) {
1047 release_sock(sk);
1048 nfc_llcp_sock_put(llcp_sock);
1049 }
1050
Samuel Ortizd6469602011-12-14 16:43:12 +01001051 /* Pass the payload upstream */
1052 if (ptype == LLCP_PDU_I) {
1053 pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1054
Samuel Ortiz53aef922012-03-05 01:03:36 +01001055 if (ns == llcp_sock->recv_n)
1056 llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1057 else
1058 pr_err("Received out of sequence I PDU\n");
1059
Samuel Ortizd6469602011-12-14 16:43:12 +01001060 skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
Samuel Ortiz1727cf92012-12-07 16:37:30 +01001061 if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1062 /*
1063 * I frames will be freed from the socket layer, so we
1064 * need to keep them alive until someone receives them.
1065 */
1066 skb_get(skb);
1067 } else {
1068 pr_err("Receive queue is full\n");
Samuel Ortizd6469602011-12-14 16:43:12 +01001069 }
1070 }
1071
1072 /* Remove skbs from the pending queue */
1073 if (llcp_sock->send_ack_n != nr) {
1074 struct sk_buff *s, *tmp;
Waldemar Rymarkiewicz28981492012-11-26 08:40:04 +01001075 u8 n;
Samuel Ortizd6469602011-12-14 16:43:12 +01001076
1077 llcp_sock->send_ack_n = nr;
1078
Samuel Ortiz84457962012-05-30 17:48:29 +02001079 /* Remove and free all skbs until ns == nr */
1080 skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
Waldemar Rymarkiewicz28981492012-11-26 08:40:04 +01001081 n = nfc_llcp_ns(s);
1082
Samuel Ortiz84457962012-05-30 17:48:29 +02001083 skb_unlink(s, &llcp_sock->tx_pending_queue);
1084 kfree_skb(s);
1085
Waldemar Rymarkiewicz28981492012-11-26 08:40:04 +01001086 if (n == nr)
Samuel Ortiz84457962012-05-30 17:48:29 +02001087 break;
1088 }
1089
1090 /* Re-queue the remaining skbs for transmission */
1091 skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1092 s, tmp) {
1093 skb_unlink(s, &llcp_sock->tx_pending_queue);
1094 skb_queue_head(&local->tx_queue, s);
1095 }
Samuel Ortizd6469602011-12-14 16:43:12 +01001096 }
1097
Samuel Ortiz53aef922012-03-05 01:03:36 +01001098 if (ptype == LLCP_PDU_RR)
1099 llcp_sock->remote_ready = true;
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001100 else if (ptype == LLCP_PDU_RNR)
Samuel Ortiz53aef922012-03-05 01:03:36 +01001101 llcp_sock->remote_ready = false;
1102
Samuel Ortiz56af2562012-05-30 18:06:11 +02001103 if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
Samuel Ortizd094afa2012-03-05 01:03:42 +01001104 nfc_llcp_send_rr(llcp_sock);
Samuel Ortizd6469602011-12-14 16:43:12 +01001105
1106 release_sock(sk);
1107 nfc_llcp_sock_put(llcp_sock);
1108}
1109
1110static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001111 struct sk_buff *skb)
Samuel Ortizd6469602011-12-14 16:43:12 +01001112{
1113 struct nfc_llcp_sock *llcp_sock;
1114 struct sock *sk;
1115 u8 dsap, ssap;
1116
1117 dsap = nfc_llcp_dsap(skb);
1118 ssap = nfc_llcp_ssap(skb);
1119
Samuel Ortiz6d2cd972013-04-03 16:44:44 +02001120 if ((dsap == 0) && (ssap == 0)) {
1121 pr_debug("Connection termination");
1122 nfc_dep_link_down(local->dev);
1123 return;
1124 }
1125
Samuel Ortizd6469602011-12-14 16:43:12 +01001126 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1127 if (llcp_sock == NULL) {
1128 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1129 return;
1130 }
1131
1132 sk = &llcp_sock->sk;
1133 lock_sock(sk);
Samuel Ortizf31652a2012-10-26 18:20:10 +02001134
1135 nfc_llcp_socket_purge(llcp_sock);
1136
Samuel Ortizd6469602011-12-14 16:43:12 +01001137 if (sk->sk_state == LLCP_CLOSED) {
1138 release_sock(sk);
1139 nfc_llcp_sock_put(llcp_sock);
1140 }
1141
Samuel Ortizd6469602011-12-14 16:43:12 +01001142 if (sk->sk_state == LLCP_CONNECTED) {
1143 nfc_put_device(local->dev);
1144 sk->sk_state = LLCP_CLOSED;
1145 sk->sk_state_change(sk);
1146 }
1147
1148 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1149
1150 release_sock(sk);
1151 nfc_llcp_sock_put(llcp_sock);
1152}
1153
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001154static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb)
Samuel Ortizd6469602011-12-14 16:43:12 +01001155{
1156 struct nfc_llcp_sock *llcp_sock;
Samuel Ortizff353d82012-05-07 12:31:19 +02001157 struct sock *sk;
Samuel Ortizd6469602011-12-14 16:43:12 +01001158 u8 dsap, ssap;
1159
Samuel Ortizd6469602011-12-14 16:43:12 +01001160 dsap = nfc_llcp_dsap(skb);
1161 ssap = nfc_llcp_ssap(skb);
1162
Samuel Ortiza69f32a2012-05-04 17:04:19 +02001163 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
Samuel Ortizd6469602011-12-14 16:43:12 +01001164 if (llcp_sock == NULL) {
1165 pr_err("Invalid CC\n");
1166 nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1167
1168 return;
1169 }
1170
Samuel Ortizff353d82012-05-07 12:31:19 +02001171 sk = &llcp_sock->sk;
Samuel Ortizd6469602011-12-14 16:43:12 +01001172
Samuel Ortiza69f32a2012-05-04 17:04:19 +02001173 /* Unlink from connecting and link to the client array */
1174 nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1175 nfc_llcp_sock_link(&local->sockets, sk);
1176 llcp_sock->dsap = ssap;
1177
Samuel Ortiz7a06e582012-05-07 22:03:34 +02001178 nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1179 skb->len - LLCP_HEADER_SIZE);
Samuel Ortizd6469602011-12-14 16:43:12 +01001180
Samuel Ortizff353d82012-05-07 12:31:19 +02001181 sk->sk_state = LLCP_CONNECTED;
1182 sk->sk_state_change(sk);
1183
Samuel Ortizd6469602011-12-14 16:43:12 +01001184 nfc_llcp_sock_put(llcp_sock);
1185}
1186
Samuel Ortiz5c0560b2012-06-26 16:13:29 +02001187static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb)
1188{
1189 struct nfc_llcp_sock *llcp_sock;
1190 struct sock *sk;
1191 u8 dsap, ssap, reason;
1192
1193 dsap = nfc_llcp_dsap(skb);
1194 ssap = nfc_llcp_ssap(skb);
1195 reason = skb->data[2];
1196
1197 pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1198
1199 switch (reason) {
1200 case LLCP_DM_NOBOUND:
1201 case LLCP_DM_REJ:
1202 llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1203 break;
1204
1205 default:
1206 llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1207 break;
1208 }
1209
1210 if (llcp_sock == NULL) {
Samuel Ortiza8df0f32012-10-16 21:15:59 +02001211 pr_debug("Already closed\n");
Samuel Ortiz5c0560b2012-06-26 16:13:29 +02001212 return;
1213 }
1214
1215 sk = &llcp_sock->sk;
1216
1217 sk->sk_err = ENXIO;
1218 sk->sk_state = LLCP_CLOSED;
1219 sk->sk_state_change(sk);
1220
1221 nfc_llcp_sock_put(llcp_sock);
Samuel Ortiz5c0560b2012-06-26 16:13:29 +02001222}
1223
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001224static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1225 struct sk_buff *skb)
1226{
1227 struct nfc_llcp_sock *llcp_sock;
1228 u8 dsap, ssap, *tlv, type, length, tid, sap;
1229 u16 tlv_len, offset;
1230 char *service_name;
1231 size_t service_name_len;
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001232 struct nfc_llcp_sdp_tlv *sdp;
1233 HLIST_HEAD(llc_sdres_list);
1234 size_t sdres_tlvs_len;
Thierry Escanded9b8d8e2013-02-15 10:43:06 +01001235 HLIST_HEAD(nl_sdres_list);
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001236
1237 dsap = nfc_llcp_dsap(skb);
1238 ssap = nfc_llcp_ssap(skb);
1239
1240 pr_debug("%d %d\n", dsap, ssap);
1241
1242 if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1243 pr_err("Wrong SNL SAP\n");
1244 return;
1245 }
1246
1247 tlv = &skb->data[LLCP_HEADER_SIZE];
1248 tlv_len = skb->len - LLCP_HEADER_SIZE;
1249 offset = 0;
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001250 sdres_tlvs_len = 0;
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001251
Szymon Janc0f450772012-10-17 15:23:39 +02001252 while (offset < tlv_len) {
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001253 type = tlv[0];
1254 length = tlv[1];
1255
1256 switch (type) {
1257 case LLCP_TLV_SDREQ:
1258 tid = tlv[2];
1259 service_name = (char *) &tlv[3];
1260 service_name_len = length - 1;
1261
Samuel Ortize6904082012-10-15 14:28:13 +02001262 pr_debug("Looking for %.16s\n", service_name);
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001263
1264 if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1265 !strncmp(service_name, "urn:nfc:sn:sdp",
1266 service_name_len)) {
1267 sap = 1;
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001268 goto add_snl;
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001269 }
1270
Samuel Ortize6904082012-10-15 14:28:13 +02001271 llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1272 service_name_len);
1273 if (!llcp_sock) {
1274 sap = 0;
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001275 goto add_snl;
Samuel Ortize6904082012-10-15 14:28:13 +02001276 }
1277
1278 /*
1279 * We found a socket but its ssap has not been reserved
1280 * yet. We need to assign it for good and send a reply.
1281 * The ssap will be freed when the socket is closed.
1282 */
1283 if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1284 atomic_t *client_count;
1285
1286 sap = nfc_llcp_reserve_sdp_ssap(local);
1287
1288 pr_debug("Reserving %d\n", sap);
1289
1290 if (sap == LLCP_SAP_MAX) {
1291 sap = 0;
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001292 goto add_snl;
Samuel Ortize6904082012-10-15 14:28:13 +02001293 }
1294
1295 client_count =
1296 &local->local_sdp_cnt[sap -
1297 LLCP_WKS_NUM_SAP];
1298
1299 atomic_inc(client_count);
1300
1301 llcp_sock->ssap = sap;
1302 llcp_sock->reserved_ssap = sap;
1303 } else {
1304 sap = llcp_sock->ssap;
1305 }
1306
1307 pr_debug("%p %d\n", llcp_sock, sap);
1308
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001309add_snl:
1310 sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1311 if (sdp == NULL)
1312 goto exit;
1313
1314 sdres_tlvs_len += sdp->tlv_len;
1315 hlist_add_head(&sdp->node, &llc_sdres_list);
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001316 break;
1317
Thierry Escanded9b8d8e2013-02-15 10:43:06 +01001318 case LLCP_TLV_SDRES:
1319 mutex_lock(&local->sdreq_lock);
1320
1321 pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1322
1323 hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1324 if (sdp->tid != tlv[2])
1325 continue;
1326
1327 sdp->sap = tlv[3];
1328
1329 pr_debug("Found: uri=%s, sap=%d\n",
1330 sdp->uri, sdp->sap);
1331
1332 hlist_del(&sdp->node);
1333
1334 hlist_add_head(&sdp->node, &nl_sdres_list);
1335
1336 break;
1337 }
1338
1339 mutex_unlock(&local->sdreq_lock);
1340 break;
1341
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001342 default:
1343 pr_err("Invalid SNL tlv value 0x%x\n", type);
1344 break;
1345 }
1346
1347 offset += length + 2;
1348 tlv += length + 2;
1349 }
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001350
1351exit:
Thierry Escanded9b8d8e2013-02-15 10:43:06 +01001352 if (!hlist_empty(&nl_sdres_list))
1353 nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1354
Thierry Escandee0ae7ba2013-02-15 10:43:05 +01001355 if (!hlist_empty(&llc_sdres_list))
1356 nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001357}
1358
Thierry Escande098dafc2013-03-29 11:47:43 +01001359static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
Samuel Ortizd6469602011-12-14 16:43:12 +01001360{
Thierry Escande098dafc2013-03-29 11:47:43 +01001361 u8 ptype;
1362 u16 pdu_len;
1363 struct sk_buff *new_skb;
Samuel Ortizd6469602011-12-14 16:43:12 +01001364
Thierry Escande098dafc2013-03-29 11:47:43 +01001365 if (skb->len <= LLCP_HEADER_SIZE) {
1366 pr_err("Malformed AGF PDU\n");
Samuel Ortizd6469602011-12-14 16:43:12 +01001367 return;
1368 }
1369
Thierry Escande098dafc2013-03-29 11:47:43 +01001370 skb_pull(skb, LLCP_HEADER_SIZE);
1371
1372 while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1373 pdu_len = skb->data[0] << 8 | skb->data[1];
1374
1375 skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1376
1377 if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1378 pr_err("Malformed AGF PDU\n");
1379 return;
1380 }
1381
1382 ptype = nfc_llcp_ptype(skb);
1383
1384 if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1385 goto next;
1386
1387 new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1388 if (new_skb == NULL) {
1389 pr_err("Could not allocate PDU\n");
1390 return;
1391 }
1392
1393 memcpy(skb_put(new_skb, pdu_len), skb->data, pdu_len);
1394
1395 nfc_llcp_rx_skb(local, new_skb);
1396
1397 kfree_skb(new_skb);
1398next:
1399 skb_pull(skb, pdu_len);
1400 }
1401}
1402
1403static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1404{
1405 u8 dsap, ssap, ptype;
1406
Samuel Ortizd6469602011-12-14 16:43:12 +01001407 ptype = nfc_llcp_ptype(skb);
1408 dsap = nfc_llcp_dsap(skb);
1409 ssap = nfc_llcp_ssap(skb);
1410
1411 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1412
Samuel Ortiz4be646e2012-04-10 19:43:13 +02001413 if (ptype != LLCP_PDU_SYMM)
Thierry Escande806bfe32016-06-07 16:21:53 +02001414 print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1415 skb->data, skb->len, true);
Samuel Ortiz4be646e2012-04-10 19:43:13 +02001416
Samuel Ortizd6469602011-12-14 16:43:12 +01001417 switch (ptype) {
1418 case LLCP_PDU_SYMM:
1419 pr_debug("SYMM\n");
1420 break;
1421
Samuel Ortiz968272b2012-10-15 16:14:37 +02001422 case LLCP_PDU_UI:
1423 pr_debug("UI\n");
1424 nfc_llcp_recv_ui(local, skb);
1425 break;
1426
Samuel Ortizd6469602011-12-14 16:43:12 +01001427 case LLCP_PDU_CONNECT:
1428 pr_debug("CONNECT\n");
1429 nfc_llcp_recv_connect(local, skb);
1430 break;
1431
1432 case LLCP_PDU_DISC:
1433 pr_debug("DISC\n");
1434 nfc_llcp_recv_disc(local, skb);
1435 break;
1436
1437 case LLCP_PDU_CC:
1438 pr_debug("CC\n");
1439 nfc_llcp_recv_cc(local, skb);
1440 break;
1441
Samuel Ortiz5c0560b2012-06-26 16:13:29 +02001442 case LLCP_PDU_DM:
1443 pr_debug("DM\n");
1444 nfc_llcp_recv_dm(local, skb);
1445 break;
1446
Samuel Ortiz19cfe582012-10-05 01:21:47 +02001447 case LLCP_PDU_SNL:
1448 pr_debug("SNL\n");
1449 nfc_llcp_recv_snl(local, skb);
1450 break;
1451
Samuel Ortizd6469602011-12-14 16:43:12 +01001452 case LLCP_PDU_I:
1453 case LLCP_PDU_RR:
Samuel Ortiz53aef922012-03-05 01:03:36 +01001454 case LLCP_PDU_RNR:
Samuel Ortizd6469602011-12-14 16:43:12 +01001455 pr_debug("I frame\n");
1456 nfc_llcp_recv_hdlc(local, skb);
1457 break;
1458
Thierry Escande098dafc2013-03-29 11:47:43 +01001459 case LLCP_PDU_AGF:
1460 pr_debug("AGF frame\n");
1461 nfc_llcp_recv_agf(local, skb);
1462 break;
Samuel Ortizd6469602011-12-14 16:43:12 +01001463 }
Thierry Escande098dafc2013-03-29 11:47:43 +01001464}
1465
1466static void nfc_llcp_rx_work(struct work_struct *work)
1467{
1468 struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1469 rx_work);
1470 struct sk_buff *skb;
1471
1472 skb = local->rx_pending;
1473 if (skb == NULL) {
1474 pr_debug("No pending SKB\n");
1475 return;
1476 }
1477
1478 __net_timestamp(skb);
1479
Hiren Tandel57be1f32014-05-05 19:43:31 +09001480 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
Thierry Escande098dafc2013-03-29 11:47:43 +01001481
1482 nfc_llcp_rx_skb(local, skb);
Samuel Ortizd6469602011-12-14 16:43:12 +01001483
Linus Torvalds916082b2012-10-02 16:01:31 -07001484 schedule_work(&local->tx_work);
Samuel Ortizd6469602011-12-14 16:43:12 +01001485 kfree_skb(local->rx_pending);
1486 local->rx_pending = NULL;
Samuel Ortizd6469602011-12-14 16:43:12 +01001487}
1488
Samuel Ortiz1727cf92012-12-07 16:37:30 +01001489static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1490{
1491 local->rx_pending = skb;
1492 del_timer(&local->link_timer);
1493 schedule_work(&local->rx_work);
1494}
1495
Samuel Ortizd6469602011-12-14 16:43:12 +01001496void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1497{
1498 struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1499
1500 pr_debug("Received an LLCP PDU\n");
1501 if (err < 0) {
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001502 pr_err("err %d\n", err);
Samuel Ortizd6469602011-12-14 16:43:12 +01001503 return;
1504 }
1505
Samuel Ortiz1727cf92012-12-07 16:37:30 +01001506 __nfc_llcp_recv(local, skb);
Samuel Ortizd6469602011-12-14 16:43:12 +01001507}
1508
Samuel Ortiz73167ce2012-05-31 00:05:50 +02001509int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1510{
1511 struct nfc_llcp_local *local;
1512
1513 local = nfc_llcp_find_local(dev);
Julien Lefrique966efbf2014-10-21 16:52:50 +02001514 if (local == NULL) {
1515 kfree_skb(skb);
Samuel Ortiz73167ce2012-05-31 00:05:50 +02001516 return -ENODEV;
Julien Lefrique966efbf2014-10-21 16:52:50 +02001517 }
Samuel Ortiz73167ce2012-05-31 00:05:50 +02001518
Samuel Ortiz1727cf92012-12-07 16:37:30 +01001519 __nfc_llcp_recv(local, skb);
Samuel Ortiz73167ce2012-05-31 00:05:50 +02001520
1521 return 0;
1522}
1523
Samuel Ortizd6469602011-12-14 16:43:12 +01001524void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1525{
1526 struct nfc_llcp_local *local;
1527
1528 local = nfc_llcp_find_local(dev);
1529 if (local == NULL)
1530 return;
1531
Thierry Escandeabd18d42013-04-02 10:25:15 +02001532 local->remote_miu = LLCP_DEFAULT_MIU;
1533 local->remote_lto = LLCP_DEFAULT_LTO;
1534
Samuel Ortizd6469602011-12-14 16:43:12 +01001535 /* Close and purge all existing sockets */
Samuel Ortiz3bbc0ce2013-02-21 17:01:06 +01001536 nfc_llcp_socket_release(local, true, 0);
Samuel Ortizd6469602011-12-14 16:43:12 +01001537}
1538
1539void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1540 u8 comm_mode, u8 rf_mode)
1541{
1542 struct nfc_llcp_local *local;
1543
1544 pr_debug("rf mode %d\n", rf_mode);
1545
1546 local = nfc_llcp_find_local(dev);
1547 if (local == NULL)
1548 return;
1549
1550 local->target_idx = target_idx;
1551 local->comm_mode = comm_mode;
1552 local->rf_mode = rf_mode;
1553
1554 if (rf_mode == NFC_RF_INITIATOR) {
1555 pr_debug("Queueing Tx work\n");
1556
Linus Torvalds916082b2012-10-02 16:01:31 -07001557 schedule_work(&local->tx_work);
Samuel Ortizd6469602011-12-14 16:43:12 +01001558 } else {
1559 mod_timer(&local->link_timer,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +01001560 jiffies + msecs_to_jiffies(local->remote_lto));
Samuel Ortizd6469602011-12-14 16:43:12 +01001561 }
1562}
1563
1564int nfc_llcp_register_device(struct nfc_dev *ndev)
1565{
Samuel Ortizd6469602011-12-14 16:43:12 +01001566 struct nfc_llcp_local *local;
Samuel Ortizd6469602011-12-14 16:43:12 +01001567
1568 local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1569 if (local == NULL)
1570 return -ENOMEM;
1571
1572 local->dev = ndev;
1573 INIT_LIST_HEAD(&local->list);
Samuel Ortizc7aa1222012-05-04 11:24:16 +02001574 kref_init(&local->ref);
Samuel Ortizd6469602011-12-14 16:43:12 +01001575 mutex_init(&local->sdp_lock);
Samuel Ortizd6469602011-12-14 16:43:12 +01001576 init_timer(&local->link_timer);
1577 local->link_timer.data = (unsigned long) local;
1578 local->link_timer.function = nfc_llcp_symm_timer;
1579
1580 skb_queue_head_init(&local->tx_queue);
1581 INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
Samuel Ortizd6469602011-12-14 16:43:12 +01001582
1583 local->rx_pending = NULL;
1584 INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
Samuel Ortizd6469602011-12-14 16:43:12 +01001585
1586 INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
Samuel Ortizd6469602011-12-14 16:43:12 +01001587
Szymon Jancfe235b52012-09-25 12:42:50 +02001588 rwlock_init(&local->sockets.lock);
1589 rwlock_init(&local->connecting_sockets.lock);
Thierry Escande4463523b2012-09-26 18:16:44 +02001590 rwlock_init(&local->raw_sockets.lock);
Samuel Ortiza69f32a2012-05-04 17:04:19 +02001591
Thierry Escande52feb442012-10-17 14:43:39 +02001592 local->lto = 150; /* 1500 ms */
1593 local->rw = LLCP_MAX_RW;
1594 local->miux = cpu_to_be16(LLCP_MAX_MIUX);
Samuel Ortizf768b342013-05-28 15:41:32 +02001595 local->local_wks = 0x1; /* LLC Link Management */
Thierry Escande52feb442012-10-17 14:43:39 +02001596
Samuel Ortizd6469602011-12-14 16:43:12 +01001597 nfc_llcp_build_gb(local);
1598
1599 local->remote_miu = LLCP_DEFAULT_MIU;
1600 local->remote_lto = LLCP_DEFAULT_LTO;
Samuel Ortizd6469602011-12-14 16:43:12 +01001601
Thierry Escanded9b8d8e2013-02-15 10:43:06 +01001602 mutex_init(&local->sdreq_lock);
1603 INIT_HLIST_HEAD(&local->pending_sdreqs);
Thierry Escande40213fa2013-03-04 15:43:32 +01001604 init_timer(&local->sdreq_timer);
1605 local->sdreq_timer.data = (unsigned long) local;
1606 local->sdreq_timer.function = nfc_llcp_sdreq_timer;
1607 INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
Thierry Escanded9b8d8e2013-02-15 10:43:06 +01001608
Thierry Escande16a78e92012-10-12 15:25:43 +02001609 list_add(&local->list, &llcp_devices);
Samuel Ortizd6469602011-12-14 16:43:12 +01001610
1611 return 0;
Samuel Ortizd6469602011-12-14 16:43:12 +01001612}
1613
1614void nfc_llcp_unregister_device(struct nfc_dev *dev)
1615{
1616 struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1617
1618 if (local == NULL) {
1619 pr_debug("No such device\n");
1620 return;
1621 }
1622
Samuel Ortizc470e312013-04-03 16:40:52 +02001623 local_cleanup(local);
Samuel Ortiz3536da02013-02-21 15:40:04 +01001624
Samuel Ortizc7aa1222012-05-04 11:24:16 +02001625 nfc_llcp_local_put(local);
Samuel Ortizd6469602011-12-14 16:43:12 +01001626}
1627
1628int __init nfc_llcp_init(void)
1629{
Samuel Ortizd6469602011-12-14 16:43:12 +01001630 return nfc_llcp_sock_init();
1631}
1632
1633void nfc_llcp_exit(void)
1634{
1635 nfc_llcp_sock_exit();
1636}