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d646960f SO |
1 | /* |
2 | * Copyright (C) 2011 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the | |
16 | * Free Software Foundation, Inc., | |
17 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | */ | |
19 | ||
20 | #define pr_fmt(fmt) "llcp: %s: " fmt, __func__ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/list.h> | |
25 | #include <linux/nfc.h> | |
26 | ||
27 | #include "../nfc.h" | |
28 | #include "llcp.h" | |
29 | ||
30 | static u8 llcp_magic[3] = {0x46, 0x66, 0x6d}; | |
31 | ||
32 | static struct list_head llcp_devices; | |
33 | ||
a69f32af | 34 | void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk) |
d646960f | 35 | { |
a69f32af SO |
36 | write_lock(&l->lock); |
37 | sk_add_node(sk, &l->head); | |
38 | write_unlock(&l->lock); | |
39 | } | |
d646960f | 40 | |
a69f32af SO |
41 | void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk) |
42 | { | |
43 | write_lock(&l->lock); | |
44 | sk_del_node_init(sk); | |
45 | write_unlock(&l->lock); | |
46 | } | |
d646960f | 47 | |
4d22ea15 | 48 | static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen) |
a69f32af SO |
49 | { |
50 | struct sock *sk; | |
51 | struct hlist_node *node, *tmp; | |
52 | struct nfc_llcp_sock *llcp_sock; | |
d646960f | 53 | |
a69f32af | 54 | write_lock(&local->sockets.lock); |
40c75f81 | 55 | |
a69f32af SO |
56 | sk_for_each_safe(sk, node, tmp, &local->sockets.head) { |
57 | llcp_sock = nfc_llcp_sock(sk); | |
d646960f | 58 | |
a69f32af | 59 | lock_sock(sk); |
d646960f | 60 | |
a69f32af SO |
61 | if (sk->sk_state == LLCP_CONNECTED) |
62 | nfc_put_device(llcp_sock->dev); | |
d646960f | 63 | |
a69f32af | 64 | if (sk->sk_state == LLCP_LISTEN) { |
d646960f SO |
65 | struct nfc_llcp_sock *lsk, *n; |
66 | struct sock *accept_sk; | |
67 | ||
a69f32af | 68 | list_for_each_entry_safe(lsk, n, &llcp_sock->accept_queue, |
427a2eb1 | 69 | accept_queue) { |
d646960f SO |
70 | accept_sk = &lsk->sk; |
71 | lock_sock(accept_sk); | |
72 | ||
73 | nfc_llcp_accept_unlink(accept_sk); | |
74 | ||
75 | accept_sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
76 | |
77 | release_sock(accept_sk); | |
78 | ||
79 | sock_orphan(accept_sk); | |
80 | } | |
4d22ea15 SO |
81 | |
82 | if (listen == true) { | |
83 | release_sock(sk); | |
84 | continue; | |
85 | } | |
d646960f SO |
86 | } |
87 | ||
a69f32af | 88 | sk->sk_state = LLCP_CLOSED; |
d646960f | 89 | |
a69f32af | 90 | release_sock(sk); |
d646960f | 91 | |
a69f32af | 92 | sock_orphan(sk); |
40c75f81 | 93 | |
a69f32af | 94 | sk_del_node_init(sk); |
d646960f SO |
95 | } |
96 | ||
a69f32af | 97 | write_unlock(&local->sockets.lock); |
d646960f SO |
98 | } |
99 | ||
c7aa1225 SO |
100 | struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) |
101 | { | |
102 | kref_get(&local->ref); | |
103 | ||
104 | return local; | |
105 | } | |
106 | ||
107 | static void local_release(struct kref *ref) | |
108 | { | |
109 | struct nfc_llcp_local *local; | |
110 | ||
111 | local = container_of(ref, struct nfc_llcp_local, ref); | |
112 | ||
113 | list_del(&local->list); | |
4d22ea15 | 114 | nfc_llcp_socket_release(local, false); |
c7aa1225 SO |
115 | del_timer_sync(&local->link_timer); |
116 | skb_queue_purge(&local->tx_queue); | |
117 | destroy_workqueue(local->tx_wq); | |
118 | destroy_workqueue(local->rx_wq); | |
07922bb1 | 119 | destroy_workqueue(local->timeout_wq); |
c7aa1225 SO |
120 | kfree_skb(local->rx_pending); |
121 | kfree(local); | |
122 | } | |
123 | ||
124 | int nfc_llcp_local_put(struct nfc_llcp_local *local) | |
125 | { | |
a69f32af SO |
126 | if (local == NULL) |
127 | return 0; | |
128 | ||
c7aa1225 SO |
129 | return kref_put(&local->ref, local_release); |
130 | } | |
131 | ||
8f50020e SO |
132 | static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, |
133 | u8 ssap, u8 dsap) | |
134 | { | |
135 | struct sock *sk; | |
136 | struct hlist_node *node; | |
137 | struct nfc_llcp_sock *llcp_sock; | |
138 | ||
139 | pr_debug("ssap dsap %d %d\n", ssap, dsap); | |
140 | ||
141 | if (ssap == 0 && dsap == 0) | |
142 | return NULL; | |
143 | ||
144 | read_lock(&local->sockets.lock); | |
145 | ||
146 | llcp_sock = NULL; | |
147 | ||
148 | sk_for_each(sk, node, &local->sockets.head) { | |
149 | llcp_sock = nfc_llcp_sock(sk); | |
150 | ||
151 | if (llcp_sock->ssap == ssap && llcp_sock->dsap == dsap) | |
152 | break; | |
153 | } | |
154 | ||
155 | read_unlock(&local->sockets.lock); | |
156 | ||
157 | if (llcp_sock == NULL) | |
158 | return NULL; | |
159 | ||
160 | sock_hold(&llcp_sock->sk); | |
161 | ||
162 | return llcp_sock; | |
163 | } | |
164 | ||
165 | static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) | |
166 | { | |
167 | sock_put(&sock->sk); | |
168 | } | |
169 | ||
d646960f SO |
170 | static void nfc_llcp_timeout_work(struct work_struct *work) |
171 | { | |
172 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 173 | timeout_work); |
d646960f SO |
174 | |
175 | nfc_dep_link_down(local->dev); | |
176 | } | |
177 | ||
178 | static void nfc_llcp_symm_timer(unsigned long data) | |
179 | { | |
180 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
181 | ||
182 | pr_err("SYMM timeout\n"); | |
183 | ||
184 | queue_work(local->timeout_wq, &local->timeout_work); | |
185 | } | |
186 | ||
187 | struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) | |
188 | { | |
189 | struct nfc_llcp_local *local, *n; | |
190 | ||
191 | list_for_each_entry_safe(local, n, &llcp_devices, list) | |
192 | if (local->dev == dev) | |
193 | return local; | |
194 | ||
195 | pr_debug("No device found\n"); | |
196 | ||
197 | return NULL; | |
198 | } | |
199 | ||
200 | static char *wks[] = { | |
201 | NULL, | |
202 | NULL, /* SDP */ | |
203 | "urn:nfc:sn:ip", | |
204 | "urn:nfc:sn:obex", | |
205 | "urn:nfc:sn:snep", | |
206 | }; | |
207 | ||
208 | static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) | |
209 | { | |
210 | int sap, num_wks; | |
211 | ||
212 | pr_debug("%s\n", service_name); | |
213 | ||
214 | if (service_name == NULL) | |
215 | return -EINVAL; | |
216 | ||
217 | num_wks = ARRAY_SIZE(wks); | |
218 | ||
427a2eb1 | 219 | for (sap = 0; sap < num_wks; sap++) { |
d646960f SO |
220 | if (wks[sap] == NULL) |
221 | continue; | |
222 | ||
223 | if (strncmp(wks[sap], service_name, service_name_len) == 0) | |
224 | return sap; | |
225 | } | |
226 | ||
227 | return -EINVAL; | |
228 | } | |
229 | ||
8f50020e SO |
230 | static |
231 | struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, | |
232 | u8 *sn, size_t sn_len) | |
233 | { | |
234 | struct sock *sk; | |
235 | struct hlist_node *node; | |
236 | struct nfc_llcp_sock *llcp_sock, *tmp_sock; | |
237 | ||
238 | pr_debug("sn %zd %p\n", sn_len, sn); | |
239 | ||
240 | if (sn == NULL || sn_len == 0) | |
241 | return NULL; | |
242 | ||
243 | read_lock(&local->sockets.lock); | |
244 | ||
245 | llcp_sock = NULL; | |
246 | ||
247 | sk_for_each(sk, node, &local->sockets.head) { | |
248 | tmp_sock = nfc_llcp_sock(sk); | |
249 | ||
250 | pr_debug("llcp sock %p\n", tmp_sock); | |
251 | ||
252 | if (tmp_sock->sk.sk_state != LLCP_LISTEN) | |
253 | continue; | |
254 | ||
255 | if (tmp_sock->service_name == NULL || | |
256 | tmp_sock->service_name_len == 0) | |
257 | continue; | |
258 | ||
259 | if (tmp_sock->service_name_len != sn_len) | |
260 | continue; | |
261 | ||
262 | if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { | |
263 | llcp_sock = tmp_sock; | |
264 | break; | |
265 | } | |
266 | } | |
267 | ||
268 | read_unlock(&local->sockets.lock); | |
269 | ||
270 | pr_debug("Found llcp sock %p\n", llcp_sock); | |
271 | ||
272 | return llcp_sock; | |
273 | } | |
274 | ||
d646960f | 275 | u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, |
427a2eb1 | 276 | struct nfc_llcp_sock *sock) |
d646960f SO |
277 | { |
278 | mutex_lock(&local->sdp_lock); | |
279 | ||
280 | if (sock->service_name != NULL && sock->service_name_len > 0) { | |
281 | int ssap = nfc_llcp_wks_sap(sock->service_name, | |
427a2eb1 | 282 | sock->service_name_len); |
d646960f SO |
283 | |
284 | if (ssap > 0) { | |
285 | pr_debug("WKS %d\n", ssap); | |
286 | ||
287 | /* This is a WKS, let's check if it's free */ | |
288 | if (local->local_wks & BIT(ssap)) { | |
289 | mutex_unlock(&local->sdp_lock); | |
290 | ||
291 | return LLCP_SAP_MAX; | |
292 | } | |
293 | ||
1762c17c | 294 | set_bit(ssap, &local->local_wks); |
d646960f SO |
295 | mutex_unlock(&local->sdp_lock); |
296 | ||
297 | return ssap; | |
298 | } | |
299 | ||
300 | /* | |
8f50020e SO |
301 | * Check if there already is a non WKS socket bound |
302 | * to this service name. | |
d646960f | 303 | */ |
8f50020e SO |
304 | if (nfc_llcp_sock_from_sn(local, sock->service_name, |
305 | sock->service_name_len) != NULL) { | |
d646960f SO |
306 | mutex_unlock(&local->sdp_lock); |
307 | ||
308 | return LLCP_SAP_MAX; | |
309 | } | |
310 | ||
d646960f SO |
311 | mutex_unlock(&local->sdp_lock); |
312 | ||
8f50020e | 313 | return LLCP_SDP_UNBOUND; |
d646960f | 314 | |
ebbb16d9 SO |
315 | } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { |
316 | if (!test_bit(sock->ssap, &local->local_wks)) { | |
317 | set_bit(sock->ssap, &local->local_wks); | |
318 | mutex_unlock(&local->sdp_lock); | |
d646960f | 319 | |
ebbb16d9 | 320 | return sock->ssap; |
d646960f SO |
321 | } |
322 | } | |
323 | ||
324 | mutex_unlock(&local->sdp_lock); | |
325 | ||
326 | return LLCP_SAP_MAX; | |
327 | } | |
328 | ||
329 | u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) | |
330 | { | |
331 | u8 local_ssap; | |
332 | ||
333 | mutex_lock(&local->sdp_lock); | |
334 | ||
335 | local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); | |
336 | if (local_ssap == LLCP_LOCAL_NUM_SAP) { | |
337 | mutex_unlock(&local->sdp_lock); | |
338 | return LLCP_SAP_MAX; | |
339 | } | |
340 | ||
1762c17c | 341 | set_bit(local_ssap, &local->local_sap); |
d646960f SO |
342 | |
343 | mutex_unlock(&local->sdp_lock); | |
344 | ||
345 | return local_ssap + LLCP_LOCAL_SAP_OFFSET; | |
346 | } | |
347 | ||
348 | void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) | |
349 | { | |
350 | u8 local_ssap; | |
351 | unsigned long *sdp; | |
352 | ||
353 | if (ssap < LLCP_WKS_NUM_SAP) { | |
354 | local_ssap = ssap; | |
355 | sdp = &local->local_wks; | |
356 | } else if (ssap < LLCP_LOCAL_NUM_SAP) { | |
8f50020e SO |
357 | atomic_t *client_cnt; |
358 | ||
d646960f SO |
359 | local_ssap = ssap - LLCP_WKS_NUM_SAP; |
360 | sdp = &local->local_sdp; | |
8f50020e SO |
361 | client_cnt = &local->local_sdp_cnt[local_ssap]; |
362 | ||
363 | pr_debug("%d clients\n", atomic_read(client_cnt)); | |
364 | ||
365 | mutex_lock(&local->sdp_lock); | |
366 | ||
367 | if (atomic_dec_and_test(client_cnt)) { | |
368 | struct nfc_llcp_sock *l_sock; | |
369 | ||
370 | pr_debug("No more clients for SAP %d\n", ssap); | |
371 | ||
372 | clear_bit(local_ssap, sdp); | |
373 | ||
374 | /* Find the listening sock and set it back to UNBOUND */ | |
375 | l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); | |
376 | if (l_sock) { | |
377 | l_sock->ssap = LLCP_SDP_UNBOUND; | |
378 | nfc_llcp_sock_put(l_sock); | |
379 | } | |
380 | } | |
381 | ||
382 | mutex_unlock(&local->sdp_lock); | |
383 | ||
384 | return; | |
d646960f SO |
385 | } else if (ssap < LLCP_MAX_SAP) { |
386 | local_ssap = ssap - LLCP_LOCAL_NUM_SAP; | |
387 | sdp = &local->local_sap; | |
388 | } else { | |
389 | return; | |
390 | } | |
391 | ||
392 | mutex_lock(&local->sdp_lock); | |
393 | ||
1762c17c | 394 | clear_bit(local_ssap, sdp); |
d646960f SO |
395 | |
396 | mutex_unlock(&local->sdp_lock); | |
397 | } | |
398 | ||
8f50020e SO |
399 | static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) |
400 | { | |
401 | u8 ssap; | |
402 | ||
403 | mutex_lock(&local->sdp_lock); | |
404 | ||
405 | ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); | |
406 | if (ssap == LLCP_SDP_NUM_SAP) { | |
407 | mutex_unlock(&local->sdp_lock); | |
408 | ||
409 | return LLCP_SAP_MAX; | |
410 | } | |
411 | ||
412 | pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); | |
413 | ||
414 | set_bit(ssap, &local->local_sdp); | |
415 | ||
416 | mutex_unlock(&local->sdp_lock); | |
417 | ||
418 | return LLCP_WKS_NUM_SAP + ssap; | |
419 | } | |
420 | ||
d646960f SO |
421 | static int nfc_llcp_build_gb(struct nfc_llcp_local *local) |
422 | { | |
423 | u8 *gb_cur, *version_tlv, version, version_length; | |
424 | u8 *lto_tlv, lto, lto_length; | |
425 | u8 *wks_tlv, wks_length; | |
56d5876a SO |
426 | u8 *miux_tlv, miux_length; |
427 | __be16 miux; | |
d646960f SO |
428 | u8 gb_len = 0; |
429 | ||
430 | version = LLCP_VERSION_11; | |
431 | version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, | |
427a2eb1 | 432 | 1, &version_length); |
d646960f SO |
433 | gb_len += version_length; |
434 | ||
435 | /* 1500 ms */ | |
436 | lto = 150; | |
91b0ade1 | 437 | lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length); |
d646960f SO |
438 | gb_len += lto_length; |
439 | ||
440 | pr_debug("Local wks 0x%lx\n", local->local_wks); | |
441 | wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, | |
427a2eb1 | 442 | &wks_length); |
d646960f SO |
443 | gb_len += wks_length; |
444 | ||
56d5876a SO |
445 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
446 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
447 | &miux_length); | |
448 | gb_len += miux_length; | |
449 | ||
d646960f SO |
450 | gb_len += ARRAY_SIZE(llcp_magic); |
451 | ||
452 | if (gb_len > NFC_MAX_GT_LEN) { | |
453 | kfree(version_tlv); | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | gb_cur = local->gb; | |
458 | ||
459 | memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); | |
460 | gb_cur += ARRAY_SIZE(llcp_magic); | |
461 | ||
462 | memcpy(gb_cur, version_tlv, version_length); | |
463 | gb_cur += version_length; | |
464 | ||
465 | memcpy(gb_cur, lto_tlv, lto_length); | |
466 | gb_cur += lto_length; | |
467 | ||
468 | memcpy(gb_cur, wks_tlv, wks_length); | |
469 | gb_cur += wks_length; | |
470 | ||
56d5876a SO |
471 | memcpy(gb_cur, miux_tlv, miux_length); |
472 | gb_cur += miux_length; | |
473 | ||
d646960f SO |
474 | kfree(version_tlv); |
475 | kfree(lto_tlv); | |
476 | ||
477 | local->gb_len = gb_len; | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
b8e7a06d SO |
482 | u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) |
483 | { | |
484 | struct nfc_llcp_local *local; | |
485 | ||
486 | local = nfc_llcp_find_local(dev); | |
487 | if (local == NULL) { | |
488 | *general_bytes_len = 0; | |
489 | return NULL; | |
490 | } | |
491 | ||
492 | nfc_llcp_build_gb(local); | |
493 | ||
494 | *general_bytes_len = local->gb_len; | |
495 | ||
496 | return local->gb; | |
497 | } | |
498 | ||
d646960f SO |
499 | int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
500 | { | |
501 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
502 | ||
503 | if (local == NULL) { | |
504 | pr_err("No LLCP device\n"); | |
505 | return -ENODEV; | |
506 | } | |
507 | ||
508 | memset(local->remote_gb, 0, NFC_MAX_GT_LEN); | |
509 | memcpy(local->remote_gb, gb, gb_len); | |
510 | local->remote_gb_len = gb_len; | |
511 | ||
427a2eb1 | 512 | if (local->remote_gb == NULL || local->remote_gb_len == 0) |
d646960f SO |
513 | return -ENODEV; |
514 | ||
515 | if (memcmp(local->remote_gb, llcp_magic, 3)) { | |
516 | pr_err("MAC does not support LLCP\n"); | |
517 | return -EINVAL; | |
518 | } | |
519 | ||
7a06e586 SO |
520 | return nfc_llcp_parse_gb_tlv(local, |
521 | &local->remote_gb[3], | |
522 | local->remote_gb_len - 3); | |
d646960f SO |
523 | } |
524 | ||
d646960f SO |
525 | static u8 nfc_llcp_dsap(struct sk_buff *pdu) |
526 | { | |
527 | return (pdu->data[0] & 0xfc) >> 2; | |
528 | } | |
529 | ||
530 | static u8 nfc_llcp_ptype(struct sk_buff *pdu) | |
531 | { | |
532 | return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); | |
533 | } | |
534 | ||
535 | static u8 nfc_llcp_ssap(struct sk_buff *pdu) | |
536 | { | |
537 | return pdu->data[1] & 0x3f; | |
538 | } | |
539 | ||
540 | static u8 nfc_llcp_ns(struct sk_buff *pdu) | |
541 | { | |
542 | return pdu->data[2] >> 4; | |
543 | } | |
544 | ||
545 | static u8 nfc_llcp_nr(struct sk_buff *pdu) | |
546 | { | |
547 | return pdu->data[2] & 0xf; | |
548 | } | |
549 | ||
550 | static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) | |
551 | { | |
279cf174 | 552 | pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); |
d646960f SO |
553 | sock->send_n = (sock->send_n + 1) % 16; |
554 | sock->recv_ack_n = (sock->recv_n - 1) % 16; | |
555 | } | |
556 | ||
84457960 SO |
557 | static void nfc_llcp_tx_work(struct work_struct *work) |
558 | { | |
559 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
560 | tx_work); | |
561 | struct sk_buff *skb; | |
562 | struct sock *sk; | |
563 | struct nfc_llcp_sock *llcp_sock; | |
564 | ||
565 | skb = skb_dequeue(&local->tx_queue); | |
566 | if (skb != NULL) { | |
567 | sk = skb->sk; | |
568 | llcp_sock = nfc_llcp_sock(sk); | |
569 | if (llcp_sock != NULL) { | |
570 | int ret; | |
571 | ||
572 | pr_debug("Sending pending skb\n"); | |
573 | print_hex_dump(KERN_DEBUG, "LLCP Tx: ", | |
574 | DUMP_PREFIX_OFFSET, 16, 1, | |
575 | skb->data, skb->len, true); | |
576 | ||
577 | ret = nfc_data_exchange(local->dev, local->target_idx, | |
578 | skb, nfc_llcp_recv, local); | |
579 | ||
580 | if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) { | |
581 | skb = skb_get(skb); | |
582 | skb_queue_tail(&llcp_sock->tx_pending_queue, | |
583 | skb); | |
584 | } | |
585 | } else { | |
586 | nfc_llcp_send_symm(local->dev); | |
587 | } | |
588 | } else { | |
589 | nfc_llcp_send_symm(local->dev); | |
590 | } | |
591 | ||
592 | mod_timer(&local->link_timer, | |
593 | jiffies + msecs_to_jiffies(2 * local->remote_lto)); | |
594 | } | |
595 | ||
a69f32af SO |
596 | static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, |
597 | u8 ssap) | |
598 | { | |
599 | struct sock *sk; | |
600 | struct nfc_llcp_sock *llcp_sock; | |
601 | struct hlist_node *node; | |
602 | ||
603 | read_lock(&local->connecting_sockets.lock); | |
604 | ||
605 | sk_for_each(sk, node, &local->connecting_sockets.head) { | |
606 | llcp_sock = nfc_llcp_sock(sk); | |
607 | ||
5a0f6f3b SO |
608 | if (llcp_sock->ssap == ssap) { |
609 | sock_hold(&llcp_sock->sk); | |
a69f32af | 610 | goto out; |
5a0f6f3b | 611 | } |
a69f32af SO |
612 | } |
613 | ||
614 | llcp_sock = NULL; | |
615 | ||
616 | out: | |
617 | read_unlock(&local->connecting_sockets.lock); | |
618 | ||
a69f32af SO |
619 | return llcp_sock; |
620 | } | |
621 | ||
a69f32af SO |
622 | static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, |
623 | u8 *sn, size_t sn_len) | |
624 | { | |
a69f32af SO |
625 | struct nfc_llcp_sock *llcp_sock; |
626 | ||
8f50020e | 627 | llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); |
d646960f | 628 | |
a69f32af SO |
629 | if (llcp_sock == NULL) |
630 | return NULL; | |
d646960f | 631 | |
a69f32af SO |
632 | sock_hold(&llcp_sock->sk); |
633 | ||
634 | return llcp_sock; | |
d646960f SO |
635 | } |
636 | ||
d646960f SO |
637 | static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) |
638 | { | |
639 | u8 *tlv = &skb->data[2], type, length; | |
640 | size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; | |
641 | ||
642 | while (offset < tlv_array_len) { | |
643 | type = tlv[0]; | |
644 | length = tlv[1]; | |
645 | ||
646 | pr_debug("type 0x%x length %d\n", type, length); | |
647 | ||
648 | if (type == LLCP_TLV_SN) { | |
649 | *sn_len = length; | |
650 | return &tlv[2]; | |
651 | } | |
652 | ||
653 | offset += length + 2; | |
654 | tlv += length + 2; | |
655 | } | |
656 | ||
657 | return NULL; | |
658 | } | |
659 | ||
660 | static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, | |
427a2eb1 | 661 | struct sk_buff *skb) |
d646960f SO |
662 | { |
663 | struct sock *new_sk, *parent; | |
664 | struct nfc_llcp_sock *sock, *new_sock; | |
a69f32af | 665 | u8 dsap, ssap, reason; |
d646960f SO |
666 | |
667 | dsap = nfc_llcp_dsap(skb); | |
668 | ssap = nfc_llcp_ssap(skb); | |
669 | ||
670 | pr_debug("%d %d\n", dsap, ssap); | |
671 | ||
d646960f | 672 | if (dsap != LLCP_SAP_SDP) { |
a69f32af SO |
673 | sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); |
674 | if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { | |
d646960f SO |
675 | reason = LLCP_DM_NOBOUND; |
676 | goto fail; | |
677 | } | |
d646960f SO |
678 | } else { |
679 | u8 *sn; | |
680 | size_t sn_len; | |
681 | ||
682 | sn = nfc_llcp_connect_sn(skb, &sn_len); | |
683 | if (sn == NULL) { | |
684 | reason = LLCP_DM_NOBOUND; | |
685 | goto fail; | |
686 | } | |
687 | ||
688 | pr_debug("Service name length %zu\n", sn_len); | |
689 | ||
a69f32af SO |
690 | sock = nfc_llcp_sock_get_sn(local, sn, sn_len); |
691 | if (sock == NULL) { | |
692 | reason = LLCP_DM_NOBOUND; | |
693 | goto fail; | |
d646960f | 694 | } |
d646960f SO |
695 | } |
696 | ||
a69f32af | 697 | lock_sock(&sock->sk); |
d646960f | 698 | |
d646960f SO |
699 | parent = &sock->sk; |
700 | ||
701 | if (sk_acceptq_is_full(parent)) { | |
702 | reason = LLCP_DM_REJ; | |
703 | release_sock(&sock->sk); | |
704 | sock_put(&sock->sk); | |
705 | goto fail; | |
706 | } | |
707 | ||
8f50020e SO |
708 | if (sock->ssap == LLCP_SDP_UNBOUND) { |
709 | u8 ssap = nfc_llcp_reserve_sdp_ssap(local); | |
710 | ||
711 | pr_debug("First client, reserving %d\n", ssap); | |
712 | ||
713 | if (ssap == LLCP_SAP_MAX) { | |
714 | reason = LLCP_DM_REJ; | |
715 | release_sock(&sock->sk); | |
716 | sock_put(&sock->sk); | |
717 | goto fail; | |
718 | } | |
719 | ||
720 | sock->ssap = ssap; | |
721 | } | |
722 | ||
427a2eb1 | 723 | new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); |
d646960f SO |
724 | if (new_sk == NULL) { |
725 | reason = LLCP_DM_REJ; | |
726 | release_sock(&sock->sk); | |
727 | sock_put(&sock->sk); | |
728 | goto fail; | |
729 | } | |
730 | ||
731 | new_sock = nfc_llcp_sock(new_sk); | |
732 | new_sock->dev = local->dev; | |
c7aa1225 | 733 | new_sock->local = nfc_llcp_local_get(local); |
93d7e490 | 734 | new_sock->miu = local->remote_miu; |
d646960f | 735 | new_sock->nfc_protocol = sock->nfc_protocol; |
d646960f | 736 | new_sock->dsap = ssap; |
025f1520 | 737 | new_sock->target_idx = local->target_idx; |
d646960f | 738 | new_sock->parent = parent; |
8f50020e SO |
739 | new_sock->ssap = sock->ssap; |
740 | if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { | |
741 | atomic_t *client_count; | |
742 | ||
743 | pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); | |
744 | ||
745 | client_count = | |
746 | &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; | |
747 | ||
748 | atomic_inc(client_count); | |
749 | new_sock->reserved_ssap = sock->ssap; | |
750 | } | |
d646960f | 751 | |
7a06e586 SO |
752 | nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], |
753 | skb->len - LLCP_HEADER_SIZE); | |
754 | ||
d646960f SO |
755 | pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); |
756 | ||
a69f32af | 757 | nfc_llcp_sock_link(&local->sockets, new_sk); |
d646960f SO |
758 | |
759 | nfc_llcp_accept_enqueue(&sock->sk, new_sk); | |
760 | ||
761 | nfc_get_device(local->dev->idx); | |
762 | ||
763 | new_sk->sk_state = LLCP_CONNECTED; | |
764 | ||
765 | /* Wake the listening processes */ | |
766 | parent->sk_data_ready(parent, 0); | |
767 | ||
768 | /* Send CC */ | |
769 | nfc_llcp_send_cc(new_sock); | |
770 | ||
771 | release_sock(&sock->sk); | |
772 | sock_put(&sock->sk); | |
773 | ||
774 | return; | |
775 | ||
776 | fail: | |
777 | /* Send DM */ | |
778 | nfc_llcp_send_dm(local, dsap, ssap, reason); | |
779 | ||
780 | return; | |
781 | ||
782 | } | |
783 | ||
d094afa1 | 784 | int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) |
4722d2b7 | 785 | { |
d094afa1 | 786 | int nr_frames = 0; |
4722d2b7 SO |
787 | struct nfc_llcp_local *local = sock->local; |
788 | ||
789 | pr_debug("Remote ready %d tx queue len %d remote rw %d", | |
427a2eb1 | 790 | sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), |
7a06e586 | 791 | sock->rw); |
4722d2b7 SO |
792 | |
793 | /* Try to queue some I frames for transmission */ | |
794 | while (sock->remote_ready && | |
7a06e586 | 795 | skb_queue_len(&sock->tx_pending_queue) < sock->rw) { |
84457960 | 796 | struct sk_buff *pdu; |
4722d2b7 SO |
797 | |
798 | pdu = skb_dequeue(&sock->tx_queue); | |
799 | if (pdu == NULL) | |
800 | break; | |
801 | ||
802 | /* Update N(S)/N(R) */ | |
803 | nfc_llcp_set_nrns(sock, pdu); | |
804 | ||
4722d2b7 | 805 | skb_queue_tail(&local->tx_queue, pdu); |
d094afa1 | 806 | nr_frames++; |
4722d2b7 | 807 | } |
d094afa1 SO |
808 | |
809 | return nr_frames; | |
4722d2b7 SO |
810 | } |
811 | ||
d646960f | 812 | static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, |
427a2eb1 | 813 | struct sk_buff *skb) |
d646960f SO |
814 | { |
815 | struct nfc_llcp_sock *llcp_sock; | |
816 | struct sock *sk; | |
817 | u8 dsap, ssap, ptype, ns, nr; | |
818 | ||
819 | ptype = nfc_llcp_ptype(skb); | |
820 | dsap = nfc_llcp_dsap(skb); | |
821 | ssap = nfc_llcp_ssap(skb); | |
822 | ns = nfc_llcp_ns(skb); | |
823 | nr = nfc_llcp_nr(skb); | |
824 | ||
825 | pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); | |
826 | ||
827 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
828 | if (llcp_sock == NULL) { | |
829 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
830 | return; | |
831 | } | |
832 | ||
833 | sk = &llcp_sock->sk; | |
834 | lock_sock(sk); | |
835 | if (sk->sk_state == LLCP_CLOSED) { | |
836 | release_sock(sk); | |
837 | nfc_llcp_sock_put(llcp_sock); | |
838 | } | |
839 | ||
d646960f SO |
840 | /* Pass the payload upstream */ |
841 | if (ptype == LLCP_PDU_I) { | |
842 | pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); | |
843 | ||
53aef920 SO |
844 | if (ns == llcp_sock->recv_n) |
845 | llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; | |
846 | else | |
847 | pr_err("Received out of sequence I PDU\n"); | |
848 | ||
d646960f SO |
849 | skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
850 | if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) { | |
851 | pr_err("receive queue is full\n"); | |
852 | skb_queue_head(&llcp_sock->tx_backlog_queue, skb); | |
853 | } | |
854 | } | |
855 | ||
856 | /* Remove skbs from the pending queue */ | |
857 | if (llcp_sock->send_ack_n != nr) { | |
858 | struct sk_buff *s, *tmp; | |
859 | ||
860 | llcp_sock->send_ack_n = nr; | |
861 | ||
84457960 SO |
862 | /* Remove and free all skbs until ns == nr */ |
863 | skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { | |
864 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
865 | kfree_skb(s); | |
866 | ||
867 | if (nfc_llcp_ns(s) == nr) | |
868 | break; | |
869 | } | |
870 | ||
871 | /* Re-queue the remaining skbs for transmission */ | |
872 | skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, | |
873 | s, tmp) { | |
874 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
875 | skb_queue_head(&local->tx_queue, s); | |
876 | } | |
d646960f SO |
877 | } |
878 | ||
53aef920 SO |
879 | if (ptype == LLCP_PDU_RR) |
880 | llcp_sock->remote_ready = true; | |
427a2eb1 | 881 | else if (ptype == LLCP_PDU_RNR) |
53aef920 SO |
882 | llcp_sock->remote_ready = false; |
883 | ||
56af2568 | 884 | if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) |
d094afa1 | 885 | nfc_llcp_send_rr(llcp_sock); |
d646960f SO |
886 | |
887 | release_sock(sk); | |
888 | nfc_llcp_sock_put(llcp_sock); | |
889 | } | |
890 | ||
891 | static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, | |
427a2eb1 | 892 | struct sk_buff *skb) |
d646960f SO |
893 | { |
894 | struct nfc_llcp_sock *llcp_sock; | |
895 | struct sock *sk; | |
896 | u8 dsap, ssap; | |
897 | ||
898 | dsap = nfc_llcp_dsap(skb); | |
899 | ssap = nfc_llcp_ssap(skb); | |
900 | ||
901 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
902 | if (llcp_sock == NULL) { | |
903 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
904 | return; | |
905 | } | |
906 | ||
907 | sk = &llcp_sock->sk; | |
908 | lock_sock(sk); | |
909 | if (sk->sk_state == LLCP_CLOSED) { | |
910 | release_sock(sk); | |
911 | nfc_llcp_sock_put(llcp_sock); | |
912 | } | |
913 | ||
d646960f SO |
914 | if (sk->sk_state == LLCP_CONNECTED) { |
915 | nfc_put_device(local->dev); | |
916 | sk->sk_state = LLCP_CLOSED; | |
917 | sk->sk_state_change(sk); | |
918 | } | |
919 | ||
920 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); | |
921 | ||
922 | release_sock(sk); | |
923 | nfc_llcp_sock_put(llcp_sock); | |
924 | } | |
925 | ||
427a2eb1 | 926 | static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) |
d646960f SO |
927 | { |
928 | struct nfc_llcp_sock *llcp_sock; | |
ff353d86 | 929 | struct sock *sk; |
d646960f SO |
930 | u8 dsap, ssap; |
931 | ||
d646960f SO |
932 | dsap = nfc_llcp_dsap(skb); |
933 | ssap = nfc_llcp_ssap(skb); | |
934 | ||
a69f32af | 935 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); |
d646960f SO |
936 | if (llcp_sock == NULL) { |
937 | pr_err("Invalid CC\n"); | |
938 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
939 | ||
940 | return; | |
941 | } | |
942 | ||
ff353d86 | 943 | sk = &llcp_sock->sk; |
d646960f | 944 | |
a69f32af SO |
945 | /* Unlink from connecting and link to the client array */ |
946 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
947 | nfc_llcp_sock_link(&local->sockets, sk); | |
948 | llcp_sock->dsap = ssap; | |
949 | ||
7a06e586 SO |
950 | nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], |
951 | skb->len - LLCP_HEADER_SIZE); | |
d646960f | 952 | |
ff353d86 SO |
953 | sk->sk_state = LLCP_CONNECTED; |
954 | sk->sk_state_change(sk); | |
955 | ||
d646960f SO |
956 | nfc_llcp_sock_put(llcp_sock); |
957 | } | |
958 | ||
5c0560b7 SO |
959 | static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) |
960 | { | |
961 | struct nfc_llcp_sock *llcp_sock; | |
962 | struct sock *sk; | |
963 | u8 dsap, ssap, reason; | |
964 | ||
965 | dsap = nfc_llcp_dsap(skb); | |
966 | ssap = nfc_llcp_ssap(skb); | |
967 | reason = skb->data[2]; | |
968 | ||
969 | pr_debug("%d %d reason %d\n", ssap, dsap, reason); | |
970 | ||
971 | switch (reason) { | |
972 | case LLCP_DM_NOBOUND: | |
973 | case LLCP_DM_REJ: | |
974 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); | |
975 | break; | |
976 | ||
977 | default: | |
978 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
979 | break; | |
980 | } | |
981 | ||
982 | if (llcp_sock == NULL) { | |
983 | pr_err("Invalid DM\n"); | |
984 | return; | |
985 | } | |
986 | ||
987 | sk = &llcp_sock->sk; | |
988 | ||
989 | sk->sk_err = ENXIO; | |
990 | sk->sk_state = LLCP_CLOSED; | |
991 | sk->sk_state_change(sk); | |
992 | ||
993 | nfc_llcp_sock_put(llcp_sock); | |
994 | ||
995 | return; | |
996 | } | |
997 | ||
d646960f SO |
998 | static void nfc_llcp_rx_work(struct work_struct *work) |
999 | { | |
1000 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 1001 | rx_work); |
d646960f SO |
1002 | u8 dsap, ssap, ptype; |
1003 | struct sk_buff *skb; | |
1004 | ||
1005 | skb = local->rx_pending; | |
1006 | if (skb == NULL) { | |
1007 | pr_debug("No pending SKB\n"); | |
1008 | return; | |
1009 | } | |
1010 | ||
1011 | ptype = nfc_llcp_ptype(skb); | |
1012 | dsap = nfc_llcp_dsap(skb); | |
1013 | ssap = nfc_llcp_ssap(skb); | |
1014 | ||
1015 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
1016 | ||
4be646ec SO |
1017 | if (ptype != LLCP_PDU_SYMM) |
1018 | print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, | |
1019 | 16, 1, skb->data, skb->len, true); | |
1020 | ||
d646960f SO |
1021 | switch (ptype) { |
1022 | case LLCP_PDU_SYMM: | |
1023 | pr_debug("SYMM\n"); | |
1024 | break; | |
1025 | ||
1026 | case LLCP_PDU_CONNECT: | |
1027 | pr_debug("CONNECT\n"); | |
1028 | nfc_llcp_recv_connect(local, skb); | |
1029 | break; | |
1030 | ||
1031 | case LLCP_PDU_DISC: | |
1032 | pr_debug("DISC\n"); | |
1033 | nfc_llcp_recv_disc(local, skb); | |
1034 | break; | |
1035 | ||
1036 | case LLCP_PDU_CC: | |
1037 | pr_debug("CC\n"); | |
1038 | nfc_llcp_recv_cc(local, skb); | |
1039 | break; | |
1040 | ||
5c0560b7 SO |
1041 | case LLCP_PDU_DM: |
1042 | pr_debug("DM\n"); | |
1043 | nfc_llcp_recv_dm(local, skb); | |
1044 | break; | |
1045 | ||
d646960f SO |
1046 | case LLCP_PDU_I: |
1047 | case LLCP_PDU_RR: | |
53aef920 | 1048 | case LLCP_PDU_RNR: |
d646960f SO |
1049 | pr_debug("I frame\n"); |
1050 | nfc_llcp_recv_hdlc(local, skb); | |
1051 | break; | |
1052 | ||
1053 | } | |
1054 | ||
1055 | queue_work(local->tx_wq, &local->tx_work); | |
1056 | kfree_skb(local->rx_pending); | |
1057 | local->rx_pending = NULL; | |
1058 | ||
1059 | return; | |
1060 | } | |
1061 | ||
1062 | void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) | |
1063 | { | |
1064 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
1065 | ||
1066 | pr_debug("Received an LLCP PDU\n"); | |
1067 | if (err < 0) { | |
427a2eb1 | 1068 | pr_err("err %d\n", err); |
d646960f SO |
1069 | return; |
1070 | } | |
1071 | ||
1072 | local->rx_pending = skb_get(skb); | |
1073 | del_timer(&local->link_timer); | |
1074 | queue_work(local->rx_wq, &local->rx_work); | |
1075 | ||
1076 | return; | |
1077 | } | |
1078 | ||
73167ced SO |
1079 | int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
1080 | { | |
1081 | struct nfc_llcp_local *local; | |
1082 | ||
1083 | local = nfc_llcp_find_local(dev); | |
1084 | if (local == NULL) | |
1085 | return -ENODEV; | |
1086 | ||
1087 | local->rx_pending = skb_get(skb); | |
1088 | del_timer(&local->link_timer); | |
1089 | queue_work(local->rx_wq, &local->rx_work); | |
1090 | ||
1091 | return 0; | |
1092 | } | |
1093 | ||
d646960f SO |
1094 | void nfc_llcp_mac_is_down(struct nfc_dev *dev) |
1095 | { | |
1096 | struct nfc_llcp_local *local; | |
1097 | ||
1098 | local = nfc_llcp_find_local(dev); | |
1099 | if (local == NULL) | |
1100 | return; | |
1101 | ||
1102 | /* Close and purge all existing sockets */ | |
4d22ea15 | 1103 | nfc_llcp_socket_release(local, true); |
d646960f SO |
1104 | } |
1105 | ||
1106 | void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, | |
1107 | u8 comm_mode, u8 rf_mode) | |
1108 | { | |
1109 | struct nfc_llcp_local *local; | |
1110 | ||
1111 | pr_debug("rf mode %d\n", rf_mode); | |
1112 | ||
1113 | local = nfc_llcp_find_local(dev); | |
1114 | if (local == NULL) | |
1115 | return; | |
1116 | ||
1117 | local->target_idx = target_idx; | |
1118 | local->comm_mode = comm_mode; | |
1119 | local->rf_mode = rf_mode; | |
1120 | ||
1121 | if (rf_mode == NFC_RF_INITIATOR) { | |
1122 | pr_debug("Queueing Tx work\n"); | |
1123 | ||
1124 | queue_work(local->tx_wq, &local->tx_work); | |
1125 | } else { | |
1126 | mod_timer(&local->link_timer, | |
427a2eb1 | 1127 | jiffies + msecs_to_jiffies(local->remote_lto)); |
d646960f SO |
1128 | } |
1129 | } | |
1130 | ||
1131 | int nfc_llcp_register_device(struct nfc_dev *ndev) | |
1132 | { | |
1133 | struct device *dev = &ndev->dev; | |
1134 | struct nfc_llcp_local *local; | |
1135 | char name[32]; | |
1136 | int err; | |
1137 | ||
1138 | local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); | |
1139 | if (local == NULL) | |
1140 | return -ENOMEM; | |
1141 | ||
1142 | local->dev = ndev; | |
1143 | INIT_LIST_HEAD(&local->list); | |
c7aa1225 | 1144 | kref_init(&local->ref); |
d646960f | 1145 | mutex_init(&local->sdp_lock); |
d646960f SO |
1146 | init_timer(&local->link_timer); |
1147 | local->link_timer.data = (unsigned long) local; | |
1148 | local->link_timer.function = nfc_llcp_symm_timer; | |
1149 | ||
1150 | skb_queue_head_init(&local->tx_queue); | |
1151 | INIT_WORK(&local->tx_work, nfc_llcp_tx_work); | |
1152 | snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev)); | |
427a2eb1 SO |
1153 | local->tx_wq = |
1154 | alloc_workqueue(name, | |
1155 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
1156 | 1); | |
d646960f SO |
1157 | if (local->tx_wq == NULL) { |
1158 | err = -ENOMEM; | |
1159 | goto err_local; | |
1160 | } | |
1161 | ||
1162 | local->rx_pending = NULL; | |
1163 | INIT_WORK(&local->rx_work, nfc_llcp_rx_work); | |
1164 | snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev)); | |
427a2eb1 SO |
1165 | local->rx_wq = |
1166 | alloc_workqueue(name, | |
1167 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
1168 | 1); | |
d646960f SO |
1169 | if (local->rx_wq == NULL) { |
1170 | err = -ENOMEM; | |
1171 | goto err_tx_wq; | |
1172 | } | |
1173 | ||
1174 | INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); | |
1175 | snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev)); | |
427a2eb1 SO |
1176 | local->timeout_wq = |
1177 | alloc_workqueue(name, | |
1178 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
1179 | 1); | |
d646960f SO |
1180 | if (local->timeout_wq == NULL) { |
1181 | err = -ENOMEM; | |
1182 | goto err_rx_wq; | |
1183 | } | |
1184 | ||
a69f32af SO |
1185 | local->sockets.lock = __RW_LOCK_UNLOCKED(local->sockets.lock); |
1186 | local->connecting_sockets.lock = __RW_LOCK_UNLOCKED(local->connecting_sockets.lock); | |
1187 | ||
d646960f SO |
1188 | nfc_llcp_build_gb(local); |
1189 | ||
1190 | local->remote_miu = LLCP_DEFAULT_MIU; | |
1191 | local->remote_lto = LLCP_DEFAULT_LTO; | |
d646960f SO |
1192 | |
1193 | list_add(&llcp_devices, &local->list); | |
1194 | ||
1195 | return 0; | |
1196 | ||
1197 | err_rx_wq: | |
1198 | destroy_workqueue(local->rx_wq); | |
1199 | ||
1200 | err_tx_wq: | |
1201 | destroy_workqueue(local->tx_wq); | |
1202 | ||
1203 | err_local: | |
1204 | kfree(local); | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | void nfc_llcp_unregister_device(struct nfc_dev *dev) | |
1210 | { | |
1211 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
1212 | ||
1213 | if (local == NULL) { | |
1214 | pr_debug("No such device\n"); | |
1215 | return; | |
1216 | } | |
1217 | ||
c7aa1225 | 1218 | nfc_llcp_local_put(local); |
d646960f SO |
1219 | } |
1220 | ||
1221 | int __init nfc_llcp_init(void) | |
1222 | { | |
1223 | INIT_LIST_HEAD(&llcp_devices); | |
1224 | ||
1225 | return nfc_llcp_sock_init(); | |
1226 | } | |
1227 | ||
1228 | void nfc_llcp_exit(void) | |
1229 | { | |
1230 | nfc_llcp_sock_exit(); | |
1231 | } |