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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 | |
f31652a5 SO |
48 | static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock) |
49 | { | |
50 | struct nfc_llcp_local *local = sock->local; | |
51 | struct sk_buff *s, *tmp; | |
52 | ||
53 | pr_debug("%p\n", &sock->sk); | |
54 | ||
55 | skb_queue_purge(&sock->tx_queue); | |
56 | skb_queue_purge(&sock->tx_pending_queue); | |
f31652a5 SO |
57 | |
58 | if (local == NULL) | |
59 | return; | |
60 | ||
61 | /* Search for local pending SKBs that are related to this socket */ | |
62 | skb_queue_walk_safe(&local->tx_queue, s, tmp) { | |
63 | if (s->sk != &sock->sk) | |
64 | continue; | |
65 | ||
66 | skb_unlink(s, &local->tx_queue); | |
67 | kfree_skb(s); | |
68 | } | |
69 | } | |
70 | ||
4d22ea15 | 71 | static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool listen) |
a69f32af SO |
72 | { |
73 | struct sock *sk; | |
b67bfe0d | 74 | struct hlist_node *tmp; |
a69f32af | 75 | struct nfc_llcp_sock *llcp_sock; |
d646960f | 76 | |
f31652a5 SO |
77 | skb_queue_purge(&local->tx_queue); |
78 | ||
a69f32af | 79 | write_lock(&local->sockets.lock); |
40c75f81 | 80 | |
b67bfe0d | 81 | sk_for_each_safe(sk, tmp, &local->sockets.head) { |
a69f32af | 82 | llcp_sock = nfc_llcp_sock(sk); |
d646960f | 83 | |
50b78b2a | 84 | bh_lock_sock(sk); |
d646960f | 85 | |
f31652a5 SO |
86 | nfc_llcp_socket_purge(llcp_sock); |
87 | ||
a69f32af SO |
88 | if (sk->sk_state == LLCP_CONNECTED) |
89 | nfc_put_device(llcp_sock->dev); | |
d646960f | 90 | |
a69f32af | 91 | if (sk->sk_state == LLCP_LISTEN) { |
d646960f SO |
92 | struct nfc_llcp_sock *lsk, *n; |
93 | struct sock *accept_sk; | |
94 | ||
0f450772 SJ |
95 | list_for_each_entry_safe(lsk, n, |
96 | &llcp_sock->accept_queue, | |
427a2eb1 | 97 | accept_queue) { |
d646960f | 98 | accept_sk = &lsk->sk; |
50b78b2a | 99 | bh_lock_sock(accept_sk); |
d646960f SO |
100 | |
101 | nfc_llcp_accept_unlink(accept_sk); | |
102 | ||
103 | accept_sk->sk_state = LLCP_CLOSED; | |
d646960f | 104 | |
50b78b2a | 105 | bh_unlock_sock(accept_sk); |
d646960f SO |
106 | |
107 | sock_orphan(accept_sk); | |
108 | } | |
4d22ea15 SO |
109 | |
110 | if (listen == true) { | |
50b78b2a | 111 | bh_unlock_sock(sk); |
4d22ea15 SO |
112 | continue; |
113 | } | |
d646960f SO |
114 | } |
115 | ||
c8512be6 SO |
116 | /* |
117 | * If we have a connection less socket bound, we keep it alive | |
118 | * if the device is still present. | |
119 | */ | |
120 | if (sk->sk_state == LLCP_BOUND && sk->sk_type == SOCK_DGRAM && | |
121 | listen == true) { | |
122 | bh_unlock_sock(sk); | |
123 | continue; | |
124 | } | |
125 | ||
a69f32af | 126 | sk->sk_state = LLCP_CLOSED; |
d646960f | 127 | |
50b78b2a | 128 | bh_unlock_sock(sk); |
d646960f | 129 | |
a69f32af | 130 | sock_orphan(sk); |
40c75f81 | 131 | |
a69f32af | 132 | sk_del_node_init(sk); |
d646960f SO |
133 | } |
134 | ||
a69f32af | 135 | write_unlock(&local->sockets.lock); |
d646960f SO |
136 | } |
137 | ||
c7aa1225 SO |
138 | struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local) |
139 | { | |
140 | kref_get(&local->ref); | |
141 | ||
142 | return local; | |
143 | } | |
144 | ||
145 | static void local_release(struct kref *ref) | |
146 | { | |
147 | struct nfc_llcp_local *local; | |
148 | ||
149 | local = container_of(ref, struct nfc_llcp_local, ref); | |
150 | ||
151 | list_del(&local->list); | |
4d22ea15 | 152 | nfc_llcp_socket_release(local, false); |
c7aa1225 SO |
153 | del_timer_sync(&local->link_timer); |
154 | skb_queue_purge(&local->tx_queue); | |
474fee3d TH |
155 | cancel_work_sync(&local->tx_work); |
156 | cancel_work_sync(&local->rx_work); | |
157 | cancel_work_sync(&local->timeout_work); | |
c7aa1225 SO |
158 | kfree_skb(local->rx_pending); |
159 | kfree(local); | |
160 | } | |
161 | ||
162 | int nfc_llcp_local_put(struct nfc_llcp_local *local) | |
163 | { | |
a69f32af SO |
164 | if (local == NULL) |
165 | return 0; | |
166 | ||
c7aa1225 SO |
167 | return kref_put(&local->ref, local_release); |
168 | } | |
169 | ||
8f50020e SO |
170 | static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, |
171 | u8 ssap, u8 dsap) | |
172 | { | |
173 | struct sock *sk; | |
a8df0f37 | 174 | struct nfc_llcp_sock *llcp_sock, *tmp_sock; |
8f50020e SO |
175 | |
176 | pr_debug("ssap dsap %d %d\n", ssap, dsap); | |
177 | ||
178 | if (ssap == 0 && dsap == 0) | |
179 | return NULL; | |
180 | ||
181 | read_lock(&local->sockets.lock); | |
182 | ||
183 | llcp_sock = NULL; | |
184 | ||
b67bfe0d | 185 | sk_for_each(sk, &local->sockets.head) { |
a8df0f37 | 186 | tmp_sock = nfc_llcp_sock(sk); |
8f50020e | 187 | |
a8df0f37 SO |
188 | if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) { |
189 | llcp_sock = tmp_sock; | |
8f50020e | 190 | break; |
a8df0f37 | 191 | } |
8f50020e SO |
192 | } |
193 | ||
194 | read_unlock(&local->sockets.lock); | |
195 | ||
196 | if (llcp_sock == NULL) | |
197 | return NULL; | |
198 | ||
199 | sock_hold(&llcp_sock->sk); | |
200 | ||
201 | return llcp_sock; | |
202 | } | |
203 | ||
204 | static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) | |
205 | { | |
206 | sock_put(&sock->sk); | |
207 | } | |
208 | ||
d646960f SO |
209 | static void nfc_llcp_timeout_work(struct work_struct *work) |
210 | { | |
211 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 212 | timeout_work); |
d646960f SO |
213 | |
214 | nfc_dep_link_down(local->dev); | |
215 | } | |
216 | ||
217 | static void nfc_llcp_symm_timer(unsigned long data) | |
218 | { | |
219 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
220 | ||
221 | pr_err("SYMM timeout\n"); | |
222 | ||
916082b0 | 223 | schedule_work(&local->timeout_work); |
d646960f SO |
224 | } |
225 | ||
226 | struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) | |
227 | { | |
228 | struct nfc_llcp_local *local, *n; | |
229 | ||
230 | list_for_each_entry_safe(local, n, &llcp_devices, list) | |
231 | if (local->dev == dev) | |
232 | return local; | |
233 | ||
234 | pr_debug("No device found\n"); | |
235 | ||
236 | return NULL; | |
237 | } | |
238 | ||
239 | static char *wks[] = { | |
240 | NULL, | |
241 | NULL, /* SDP */ | |
242 | "urn:nfc:sn:ip", | |
243 | "urn:nfc:sn:obex", | |
244 | "urn:nfc:sn:snep", | |
245 | }; | |
246 | ||
247 | static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) | |
248 | { | |
249 | int sap, num_wks; | |
250 | ||
251 | pr_debug("%s\n", service_name); | |
252 | ||
253 | if (service_name == NULL) | |
254 | return -EINVAL; | |
255 | ||
256 | num_wks = ARRAY_SIZE(wks); | |
257 | ||
427a2eb1 | 258 | for (sap = 0; sap < num_wks; sap++) { |
d646960f SO |
259 | if (wks[sap] == NULL) |
260 | continue; | |
261 | ||
262 | if (strncmp(wks[sap], service_name, service_name_len) == 0) | |
263 | return sap; | |
264 | } | |
265 | ||
266 | return -EINVAL; | |
267 | } | |
268 | ||
8f50020e SO |
269 | static |
270 | struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local, | |
271 | u8 *sn, size_t sn_len) | |
272 | { | |
273 | struct sock *sk; | |
8f50020e SO |
274 | struct nfc_llcp_sock *llcp_sock, *tmp_sock; |
275 | ||
276 | pr_debug("sn %zd %p\n", sn_len, sn); | |
277 | ||
278 | if (sn == NULL || sn_len == 0) | |
279 | return NULL; | |
280 | ||
281 | read_lock(&local->sockets.lock); | |
282 | ||
283 | llcp_sock = NULL; | |
284 | ||
b67bfe0d | 285 | sk_for_each(sk, &local->sockets.head) { |
8f50020e SO |
286 | tmp_sock = nfc_llcp_sock(sk); |
287 | ||
288 | pr_debug("llcp sock %p\n", tmp_sock); | |
289 | ||
54292d64 SO |
290 | if (tmp_sock->sk.sk_type == SOCK_STREAM && |
291 | tmp_sock->sk.sk_state != LLCP_LISTEN) | |
292 | continue; | |
293 | ||
294 | if (tmp_sock->sk.sk_type == SOCK_DGRAM && | |
295 | tmp_sock->sk.sk_state != LLCP_BOUND) | |
8f50020e SO |
296 | continue; |
297 | ||
298 | if (tmp_sock->service_name == NULL || | |
299 | tmp_sock->service_name_len == 0) | |
300 | continue; | |
301 | ||
302 | if (tmp_sock->service_name_len != sn_len) | |
303 | continue; | |
304 | ||
305 | if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { | |
306 | llcp_sock = tmp_sock; | |
307 | break; | |
308 | } | |
309 | } | |
310 | ||
311 | read_unlock(&local->sockets.lock); | |
312 | ||
313 | pr_debug("Found llcp sock %p\n", llcp_sock); | |
314 | ||
315 | return llcp_sock; | |
316 | } | |
317 | ||
d646960f | 318 | u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, |
427a2eb1 | 319 | struct nfc_llcp_sock *sock) |
d646960f SO |
320 | { |
321 | mutex_lock(&local->sdp_lock); | |
322 | ||
323 | if (sock->service_name != NULL && sock->service_name_len > 0) { | |
324 | int ssap = nfc_llcp_wks_sap(sock->service_name, | |
427a2eb1 | 325 | sock->service_name_len); |
d646960f SO |
326 | |
327 | if (ssap > 0) { | |
328 | pr_debug("WKS %d\n", ssap); | |
329 | ||
330 | /* This is a WKS, let's check if it's free */ | |
331 | if (local->local_wks & BIT(ssap)) { | |
332 | mutex_unlock(&local->sdp_lock); | |
333 | ||
334 | return LLCP_SAP_MAX; | |
335 | } | |
336 | ||
1762c17c | 337 | set_bit(ssap, &local->local_wks); |
d646960f SO |
338 | mutex_unlock(&local->sdp_lock); |
339 | ||
340 | return ssap; | |
341 | } | |
342 | ||
343 | /* | |
8f50020e SO |
344 | * Check if there already is a non WKS socket bound |
345 | * to this service name. | |
d646960f | 346 | */ |
8f50020e SO |
347 | if (nfc_llcp_sock_from_sn(local, sock->service_name, |
348 | sock->service_name_len) != NULL) { | |
d646960f SO |
349 | mutex_unlock(&local->sdp_lock); |
350 | ||
351 | return LLCP_SAP_MAX; | |
352 | } | |
353 | ||
d646960f SO |
354 | mutex_unlock(&local->sdp_lock); |
355 | ||
8f50020e | 356 | return LLCP_SDP_UNBOUND; |
d646960f | 357 | |
ebbb16d9 SO |
358 | } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { |
359 | if (!test_bit(sock->ssap, &local->local_wks)) { | |
360 | set_bit(sock->ssap, &local->local_wks); | |
361 | mutex_unlock(&local->sdp_lock); | |
d646960f | 362 | |
ebbb16d9 | 363 | return sock->ssap; |
d646960f SO |
364 | } |
365 | } | |
366 | ||
367 | mutex_unlock(&local->sdp_lock); | |
368 | ||
369 | return LLCP_SAP_MAX; | |
370 | } | |
371 | ||
372 | u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) | |
373 | { | |
374 | u8 local_ssap; | |
375 | ||
376 | mutex_lock(&local->sdp_lock); | |
377 | ||
378 | local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); | |
379 | if (local_ssap == LLCP_LOCAL_NUM_SAP) { | |
380 | mutex_unlock(&local->sdp_lock); | |
381 | return LLCP_SAP_MAX; | |
382 | } | |
383 | ||
1762c17c | 384 | set_bit(local_ssap, &local->local_sap); |
d646960f SO |
385 | |
386 | mutex_unlock(&local->sdp_lock); | |
387 | ||
388 | return local_ssap + LLCP_LOCAL_SAP_OFFSET; | |
389 | } | |
390 | ||
391 | void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) | |
392 | { | |
393 | u8 local_ssap; | |
394 | unsigned long *sdp; | |
395 | ||
396 | if (ssap < LLCP_WKS_NUM_SAP) { | |
397 | local_ssap = ssap; | |
398 | sdp = &local->local_wks; | |
399 | } else if (ssap < LLCP_LOCAL_NUM_SAP) { | |
8f50020e SO |
400 | atomic_t *client_cnt; |
401 | ||
d646960f SO |
402 | local_ssap = ssap - LLCP_WKS_NUM_SAP; |
403 | sdp = &local->local_sdp; | |
8f50020e SO |
404 | client_cnt = &local->local_sdp_cnt[local_ssap]; |
405 | ||
406 | pr_debug("%d clients\n", atomic_read(client_cnt)); | |
407 | ||
408 | mutex_lock(&local->sdp_lock); | |
409 | ||
410 | if (atomic_dec_and_test(client_cnt)) { | |
411 | struct nfc_llcp_sock *l_sock; | |
412 | ||
413 | pr_debug("No more clients for SAP %d\n", ssap); | |
414 | ||
415 | clear_bit(local_ssap, sdp); | |
416 | ||
417 | /* Find the listening sock and set it back to UNBOUND */ | |
418 | l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); | |
419 | if (l_sock) { | |
420 | l_sock->ssap = LLCP_SDP_UNBOUND; | |
421 | nfc_llcp_sock_put(l_sock); | |
422 | } | |
423 | } | |
424 | ||
425 | mutex_unlock(&local->sdp_lock); | |
426 | ||
427 | return; | |
d646960f SO |
428 | } else if (ssap < LLCP_MAX_SAP) { |
429 | local_ssap = ssap - LLCP_LOCAL_NUM_SAP; | |
430 | sdp = &local->local_sap; | |
431 | } else { | |
432 | return; | |
433 | } | |
434 | ||
435 | mutex_lock(&local->sdp_lock); | |
436 | ||
1762c17c | 437 | clear_bit(local_ssap, sdp); |
d646960f SO |
438 | |
439 | mutex_unlock(&local->sdp_lock); | |
440 | } | |
441 | ||
8f50020e SO |
442 | static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) |
443 | { | |
444 | u8 ssap; | |
445 | ||
446 | mutex_lock(&local->sdp_lock); | |
447 | ||
448 | ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); | |
449 | if (ssap == LLCP_SDP_NUM_SAP) { | |
450 | mutex_unlock(&local->sdp_lock); | |
451 | ||
452 | return LLCP_SAP_MAX; | |
453 | } | |
454 | ||
455 | pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); | |
456 | ||
457 | set_bit(ssap, &local->local_sdp); | |
458 | ||
459 | mutex_unlock(&local->sdp_lock); | |
460 | ||
461 | return LLCP_WKS_NUM_SAP + ssap; | |
462 | } | |
463 | ||
d646960f SO |
464 | static int nfc_llcp_build_gb(struct nfc_llcp_local *local) |
465 | { | |
466 | u8 *gb_cur, *version_tlv, version, version_length; | |
52feb444 | 467 | u8 *lto_tlv, lto_length; |
d646960f | 468 | u8 *wks_tlv, wks_length; |
56d5876a | 469 | u8 *miux_tlv, miux_length; |
d646960f | 470 | u8 gb_len = 0; |
52da2449 | 471 | int ret = 0; |
d646960f SO |
472 | |
473 | version = LLCP_VERSION_11; | |
474 | version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, | |
427a2eb1 | 475 | 1, &version_length); |
d646960f SO |
476 | gb_len += version_length; |
477 | ||
52feb444 | 478 | lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, <o_length); |
d646960f SO |
479 | gb_len += lto_length; |
480 | ||
481 | pr_debug("Local wks 0x%lx\n", local->local_wks); | |
482 | wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, | |
427a2eb1 | 483 | &wks_length); |
d646960f SO |
484 | gb_len += wks_length; |
485 | ||
52feb444 | 486 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
56d5876a SO |
487 | &miux_length); |
488 | gb_len += miux_length; | |
489 | ||
d646960f SO |
490 | gb_len += ARRAY_SIZE(llcp_magic); |
491 | ||
492 | if (gb_len > NFC_MAX_GT_LEN) { | |
52da2449 WY |
493 | ret = -EINVAL; |
494 | goto out; | |
d646960f SO |
495 | } |
496 | ||
497 | gb_cur = local->gb; | |
498 | ||
499 | memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); | |
500 | gb_cur += ARRAY_SIZE(llcp_magic); | |
501 | ||
502 | memcpy(gb_cur, version_tlv, version_length); | |
503 | gb_cur += version_length; | |
504 | ||
505 | memcpy(gb_cur, lto_tlv, lto_length); | |
506 | gb_cur += lto_length; | |
507 | ||
508 | memcpy(gb_cur, wks_tlv, wks_length); | |
509 | gb_cur += wks_length; | |
510 | ||
56d5876a SO |
511 | memcpy(gb_cur, miux_tlv, miux_length); |
512 | gb_cur += miux_length; | |
513 | ||
52da2449 WY |
514 | local->gb_len = gb_len; |
515 | ||
516 | out: | |
d646960f SO |
517 | kfree(version_tlv); |
518 | kfree(lto_tlv); | |
52da2449 WY |
519 | kfree(wks_tlv); |
520 | kfree(miux_tlv); | |
d646960f | 521 | |
52da2449 | 522 | return ret; |
d646960f SO |
523 | } |
524 | ||
b8e7a06d SO |
525 | u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) |
526 | { | |
527 | struct nfc_llcp_local *local; | |
528 | ||
529 | local = nfc_llcp_find_local(dev); | |
530 | if (local == NULL) { | |
531 | *general_bytes_len = 0; | |
532 | return NULL; | |
533 | } | |
534 | ||
535 | nfc_llcp_build_gb(local); | |
536 | ||
537 | *general_bytes_len = local->gb_len; | |
538 | ||
539 | return local->gb; | |
540 | } | |
541 | ||
d646960f SO |
542 | int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
543 | { | |
544 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
545 | ||
546 | if (local == NULL) { | |
547 | pr_err("No LLCP device\n"); | |
548 | return -ENODEV; | |
549 | } | |
e9a4aa3b DC |
550 | if (gb_len < 3) |
551 | return -EINVAL; | |
d646960f SO |
552 | |
553 | memset(local->remote_gb, 0, NFC_MAX_GT_LEN); | |
554 | memcpy(local->remote_gb, gb, gb_len); | |
555 | local->remote_gb_len = gb_len; | |
556 | ||
d646960f SO |
557 | if (memcmp(local->remote_gb, llcp_magic, 3)) { |
558 | pr_err("MAC does not support LLCP\n"); | |
559 | return -EINVAL; | |
560 | } | |
561 | ||
7a06e586 SO |
562 | return nfc_llcp_parse_gb_tlv(local, |
563 | &local->remote_gb[3], | |
564 | local->remote_gb_len - 3); | |
d646960f SO |
565 | } |
566 | ||
d646960f SO |
567 | static u8 nfc_llcp_dsap(struct sk_buff *pdu) |
568 | { | |
569 | return (pdu->data[0] & 0xfc) >> 2; | |
570 | } | |
571 | ||
572 | static u8 nfc_llcp_ptype(struct sk_buff *pdu) | |
573 | { | |
574 | return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); | |
575 | } | |
576 | ||
577 | static u8 nfc_llcp_ssap(struct sk_buff *pdu) | |
578 | { | |
579 | return pdu->data[1] & 0x3f; | |
580 | } | |
581 | ||
582 | static u8 nfc_llcp_ns(struct sk_buff *pdu) | |
583 | { | |
584 | return pdu->data[2] >> 4; | |
585 | } | |
586 | ||
587 | static u8 nfc_llcp_nr(struct sk_buff *pdu) | |
588 | { | |
589 | return pdu->data[2] & 0xf; | |
590 | } | |
591 | ||
592 | static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) | |
593 | { | |
279cf174 | 594 | pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); |
d646960f SO |
595 | sock->send_n = (sock->send_n + 1) % 16; |
596 | sock->recv_ack_n = (sock->recv_n - 1) % 16; | |
597 | } | |
598 | ||
4463523b TE |
599 | void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, |
600 | struct sk_buff *skb, u8 direction) | |
601 | { | |
4463523b TE |
602 | struct sk_buff *skb_copy = NULL, *nskb; |
603 | struct sock *sk; | |
604 | u8 *data; | |
605 | ||
606 | read_lock(&local->raw_sockets.lock); | |
607 | ||
b67bfe0d | 608 | sk_for_each(sk, &local->raw_sockets.head) { |
4463523b TE |
609 | if (sk->sk_state != LLCP_BOUND) |
610 | continue; | |
611 | ||
612 | if (skb_copy == NULL) { | |
613 | skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, | |
614 | GFP_ATOMIC); | |
615 | ||
616 | if (skb_copy == NULL) | |
617 | continue; | |
618 | ||
619 | data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); | |
620 | ||
621 | data[0] = local->dev ? local->dev->idx : 0xFF; | |
622 | data[1] = direction; | |
623 | } | |
624 | ||
625 | nskb = skb_clone(skb_copy, GFP_ATOMIC); | |
626 | if (!nskb) | |
627 | continue; | |
628 | ||
629 | if (sock_queue_rcv_skb(sk, nskb)) | |
630 | kfree_skb(nskb); | |
631 | } | |
632 | ||
633 | read_unlock(&local->raw_sockets.lock); | |
634 | ||
635 | kfree_skb(skb_copy); | |
636 | } | |
637 | ||
84457960 SO |
638 | static void nfc_llcp_tx_work(struct work_struct *work) |
639 | { | |
640 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
641 | tx_work); | |
642 | struct sk_buff *skb; | |
643 | struct sock *sk; | |
644 | struct nfc_llcp_sock *llcp_sock; | |
645 | ||
646 | skb = skb_dequeue(&local->tx_queue); | |
647 | if (skb != NULL) { | |
648 | sk = skb->sk; | |
649 | llcp_sock = nfc_llcp_sock(sk); | |
a6a0915f SO |
650 | |
651 | if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { | |
652 | nfc_llcp_send_symm(local->dev); | |
653 | } else { | |
be02b6b6 SO |
654 | struct sk_buff *copy_skb = NULL; |
655 | u8 ptype = nfc_llcp_ptype(skb); | |
84457960 SO |
656 | int ret; |
657 | ||
658 | pr_debug("Sending pending skb\n"); | |
659 | print_hex_dump(KERN_DEBUG, "LLCP Tx: ", | |
660 | DUMP_PREFIX_OFFSET, 16, 1, | |
661 | skb->data, skb->len, true); | |
662 | ||
be02b6b6 SO |
663 | if (ptype == LLCP_PDU_I) |
664 | copy_skb = skb_copy(skb, GFP_ATOMIC); | |
665 | ||
2c2d45bd TE |
666 | __net_timestamp(skb); |
667 | ||
4463523b TE |
668 | nfc_llcp_send_to_raw_sock(local, skb, |
669 | NFC_LLCP_DIRECTION_TX); | |
670 | ||
84457960 SO |
671 | ret = nfc_data_exchange(local->dev, local->target_idx, |
672 | skb, nfc_llcp_recv, local); | |
673 | ||
be02b6b6 SO |
674 | if (ret) { |
675 | kfree_skb(copy_skb); | |
676 | goto out; | |
84457960 | 677 | } |
be02b6b6 SO |
678 | |
679 | if (ptype == LLCP_PDU_I && copy_skb) | |
680 | skb_queue_tail(&llcp_sock->tx_pending_queue, | |
681 | copy_skb); | |
84457960 SO |
682 | } |
683 | } else { | |
684 | nfc_llcp_send_symm(local->dev); | |
685 | } | |
686 | ||
be02b6b6 | 687 | out: |
84457960 SO |
688 | mod_timer(&local->link_timer, |
689 | jiffies + msecs_to_jiffies(2 * local->remote_lto)); | |
690 | } | |
691 | ||
a69f32af SO |
692 | static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, |
693 | u8 ssap) | |
694 | { | |
695 | struct sock *sk; | |
696 | struct nfc_llcp_sock *llcp_sock; | |
a69f32af SO |
697 | |
698 | read_lock(&local->connecting_sockets.lock); | |
699 | ||
b67bfe0d | 700 | sk_for_each(sk, &local->connecting_sockets.head) { |
a69f32af SO |
701 | llcp_sock = nfc_llcp_sock(sk); |
702 | ||
5a0f6f3b SO |
703 | if (llcp_sock->ssap == ssap) { |
704 | sock_hold(&llcp_sock->sk); | |
a69f32af | 705 | goto out; |
5a0f6f3b | 706 | } |
a69f32af SO |
707 | } |
708 | ||
709 | llcp_sock = NULL; | |
710 | ||
711 | out: | |
712 | read_unlock(&local->connecting_sockets.lock); | |
713 | ||
a69f32af SO |
714 | return llcp_sock; |
715 | } | |
716 | ||
a69f32af SO |
717 | static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, |
718 | u8 *sn, size_t sn_len) | |
719 | { | |
a69f32af SO |
720 | struct nfc_llcp_sock *llcp_sock; |
721 | ||
8f50020e | 722 | llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); |
d646960f | 723 | |
a69f32af SO |
724 | if (llcp_sock == NULL) |
725 | return NULL; | |
d646960f | 726 | |
a69f32af SO |
727 | sock_hold(&llcp_sock->sk); |
728 | ||
729 | return llcp_sock; | |
d646960f SO |
730 | } |
731 | ||
d646960f SO |
732 | static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) |
733 | { | |
734 | u8 *tlv = &skb->data[2], type, length; | |
735 | size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; | |
736 | ||
737 | while (offset < tlv_array_len) { | |
738 | type = tlv[0]; | |
739 | length = tlv[1]; | |
740 | ||
741 | pr_debug("type 0x%x length %d\n", type, length); | |
742 | ||
743 | if (type == LLCP_TLV_SN) { | |
744 | *sn_len = length; | |
745 | return &tlv[2]; | |
746 | } | |
747 | ||
748 | offset += length + 2; | |
749 | tlv += length + 2; | |
750 | } | |
751 | ||
752 | return NULL; | |
753 | } | |
754 | ||
968272bf SO |
755 | static void nfc_llcp_recv_ui(struct nfc_llcp_local *local, |
756 | struct sk_buff *skb) | |
757 | { | |
758 | struct nfc_llcp_sock *llcp_sock; | |
759 | struct nfc_llcp_ui_cb *ui_cb; | |
760 | u8 dsap, ssap; | |
761 | ||
762 | dsap = nfc_llcp_dsap(skb); | |
763 | ssap = nfc_llcp_ssap(skb); | |
764 | ||
765 | ui_cb = nfc_llcp_ui_skb_cb(skb); | |
766 | ui_cb->dsap = dsap; | |
767 | ui_cb->ssap = ssap; | |
768 | ||
769 | printk("%s %d %d\n", __func__, dsap, ssap); | |
770 | ||
771 | pr_debug("%d %d\n", dsap, ssap); | |
772 | ||
773 | /* We're looking for a bound socket, not a client one */ | |
774 | llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); | |
775 | if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM) | |
776 | return; | |
777 | ||
778 | /* There is no sequence with UI frames */ | |
779 | skb_pull(skb, LLCP_HEADER_SIZE); | |
1727cf93 SO |
780 | if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { |
781 | /* | |
782 | * UI frames will be freed from the socket layer, so we | |
783 | * need to keep them alive until someone receives them. | |
784 | */ | |
785 | skb_get(skb); | |
786 | } else { | |
787 | pr_err("Receive queue is full\n"); | |
2593c2c6 | 788 | kfree_skb(skb); |
968272bf SO |
789 | } |
790 | ||
791 | nfc_llcp_sock_put(llcp_sock); | |
792 | } | |
793 | ||
d646960f | 794 | static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, |
427a2eb1 | 795 | struct sk_buff *skb) |
d646960f SO |
796 | { |
797 | struct sock *new_sk, *parent; | |
798 | struct nfc_llcp_sock *sock, *new_sock; | |
a69f32af | 799 | u8 dsap, ssap, reason; |
d646960f SO |
800 | |
801 | dsap = nfc_llcp_dsap(skb); | |
802 | ssap = nfc_llcp_ssap(skb); | |
803 | ||
804 | pr_debug("%d %d\n", dsap, ssap); | |
805 | ||
d646960f | 806 | if (dsap != LLCP_SAP_SDP) { |
a69f32af SO |
807 | sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); |
808 | if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { | |
d646960f SO |
809 | reason = LLCP_DM_NOBOUND; |
810 | goto fail; | |
811 | } | |
d646960f SO |
812 | } else { |
813 | u8 *sn; | |
814 | size_t sn_len; | |
815 | ||
816 | sn = nfc_llcp_connect_sn(skb, &sn_len); | |
817 | if (sn == NULL) { | |
818 | reason = LLCP_DM_NOBOUND; | |
819 | goto fail; | |
820 | } | |
821 | ||
822 | pr_debug("Service name length %zu\n", sn_len); | |
823 | ||
a69f32af SO |
824 | sock = nfc_llcp_sock_get_sn(local, sn, sn_len); |
825 | if (sock == NULL) { | |
826 | reason = LLCP_DM_NOBOUND; | |
827 | goto fail; | |
d646960f | 828 | } |
d646960f SO |
829 | } |
830 | ||
a69f32af | 831 | lock_sock(&sock->sk); |
d646960f | 832 | |
d646960f SO |
833 | parent = &sock->sk; |
834 | ||
835 | if (sk_acceptq_is_full(parent)) { | |
836 | reason = LLCP_DM_REJ; | |
837 | release_sock(&sock->sk); | |
838 | sock_put(&sock->sk); | |
839 | goto fail; | |
840 | } | |
841 | ||
8f50020e SO |
842 | if (sock->ssap == LLCP_SDP_UNBOUND) { |
843 | u8 ssap = nfc_llcp_reserve_sdp_ssap(local); | |
844 | ||
845 | pr_debug("First client, reserving %d\n", ssap); | |
846 | ||
847 | if (ssap == LLCP_SAP_MAX) { | |
848 | reason = LLCP_DM_REJ; | |
849 | release_sock(&sock->sk); | |
850 | sock_put(&sock->sk); | |
851 | goto fail; | |
852 | } | |
853 | ||
854 | sock->ssap = ssap; | |
855 | } | |
856 | ||
427a2eb1 | 857 | new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); |
d646960f SO |
858 | if (new_sk == NULL) { |
859 | reason = LLCP_DM_REJ; | |
860 | release_sock(&sock->sk); | |
861 | sock_put(&sock->sk); | |
862 | goto fail; | |
863 | } | |
864 | ||
865 | new_sock = nfc_llcp_sock(new_sk); | |
866 | new_sock->dev = local->dev; | |
c7aa1225 | 867 | new_sock->local = nfc_llcp_local_get(local); |
93d7e490 | 868 | new_sock->miu = local->remote_miu; |
d646960f | 869 | new_sock->nfc_protocol = sock->nfc_protocol; |
d646960f | 870 | new_sock->dsap = ssap; |
025f1520 | 871 | new_sock->target_idx = local->target_idx; |
d646960f | 872 | new_sock->parent = parent; |
8f50020e SO |
873 | new_sock->ssap = sock->ssap; |
874 | if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { | |
875 | atomic_t *client_count; | |
876 | ||
877 | pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); | |
878 | ||
879 | client_count = | |
880 | &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; | |
881 | ||
882 | atomic_inc(client_count); | |
883 | new_sock->reserved_ssap = sock->ssap; | |
884 | } | |
d646960f | 885 | |
7a06e586 SO |
886 | nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], |
887 | skb->len - LLCP_HEADER_SIZE); | |
888 | ||
d646960f SO |
889 | pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); |
890 | ||
a69f32af | 891 | nfc_llcp_sock_link(&local->sockets, new_sk); |
d646960f SO |
892 | |
893 | nfc_llcp_accept_enqueue(&sock->sk, new_sk); | |
894 | ||
895 | nfc_get_device(local->dev->idx); | |
896 | ||
897 | new_sk->sk_state = LLCP_CONNECTED; | |
898 | ||
899 | /* Wake the listening processes */ | |
900 | parent->sk_data_ready(parent, 0); | |
901 | ||
902 | /* Send CC */ | |
903 | nfc_llcp_send_cc(new_sock); | |
904 | ||
905 | release_sock(&sock->sk); | |
906 | sock_put(&sock->sk); | |
907 | ||
908 | return; | |
909 | ||
910 | fail: | |
911 | /* Send DM */ | |
912 | nfc_llcp_send_dm(local, dsap, ssap, reason); | |
d646960f SO |
913 | } |
914 | ||
d094afa1 | 915 | int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) |
4722d2b7 | 916 | { |
d094afa1 | 917 | int nr_frames = 0; |
4722d2b7 SO |
918 | struct nfc_llcp_local *local = sock->local; |
919 | ||
920 | pr_debug("Remote ready %d tx queue len %d remote rw %d", | |
427a2eb1 | 921 | sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), |
7a06e586 | 922 | sock->rw); |
4722d2b7 SO |
923 | |
924 | /* Try to queue some I frames for transmission */ | |
925 | while (sock->remote_ready && | |
7a06e586 | 926 | skb_queue_len(&sock->tx_pending_queue) < sock->rw) { |
84457960 | 927 | struct sk_buff *pdu; |
4722d2b7 SO |
928 | |
929 | pdu = skb_dequeue(&sock->tx_queue); | |
930 | if (pdu == NULL) | |
931 | break; | |
932 | ||
933 | /* Update N(S)/N(R) */ | |
934 | nfc_llcp_set_nrns(sock, pdu); | |
935 | ||
4722d2b7 | 936 | skb_queue_tail(&local->tx_queue, pdu); |
d094afa1 | 937 | nr_frames++; |
4722d2b7 | 938 | } |
d094afa1 SO |
939 | |
940 | return nr_frames; | |
4722d2b7 SO |
941 | } |
942 | ||
d646960f | 943 | static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, |
427a2eb1 | 944 | struct sk_buff *skb) |
d646960f SO |
945 | { |
946 | struct nfc_llcp_sock *llcp_sock; | |
947 | struct sock *sk; | |
948 | u8 dsap, ssap, ptype, ns, nr; | |
949 | ||
950 | ptype = nfc_llcp_ptype(skb); | |
951 | dsap = nfc_llcp_dsap(skb); | |
952 | ssap = nfc_llcp_ssap(skb); | |
953 | ns = nfc_llcp_ns(skb); | |
954 | nr = nfc_llcp_nr(skb); | |
955 | ||
956 | pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); | |
957 | ||
958 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
959 | if (llcp_sock == NULL) { | |
960 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
961 | return; | |
962 | } | |
963 | ||
964 | sk = &llcp_sock->sk; | |
965 | lock_sock(sk); | |
966 | if (sk->sk_state == LLCP_CLOSED) { | |
967 | release_sock(sk); | |
968 | nfc_llcp_sock_put(llcp_sock); | |
969 | } | |
970 | ||
d646960f SO |
971 | /* Pass the payload upstream */ |
972 | if (ptype == LLCP_PDU_I) { | |
973 | pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); | |
974 | ||
53aef920 SO |
975 | if (ns == llcp_sock->recv_n) |
976 | llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; | |
977 | else | |
978 | pr_err("Received out of sequence I PDU\n"); | |
979 | ||
d646960f | 980 | skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
1727cf93 SO |
981 | if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) { |
982 | /* | |
983 | * I frames will be freed from the socket layer, so we | |
984 | * need to keep them alive until someone receives them. | |
985 | */ | |
986 | skb_get(skb); | |
987 | } else { | |
988 | pr_err("Receive queue is full\n"); | |
2593c2c6 | 989 | kfree_skb(skb); |
d646960f SO |
990 | } |
991 | } | |
992 | ||
993 | /* Remove skbs from the pending queue */ | |
994 | if (llcp_sock->send_ack_n != nr) { | |
995 | struct sk_buff *s, *tmp; | |
28981491 | 996 | u8 n; |
d646960f SO |
997 | |
998 | llcp_sock->send_ack_n = nr; | |
999 | ||
84457960 SO |
1000 | /* Remove and free all skbs until ns == nr */ |
1001 | skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { | |
28981491 WR |
1002 | n = nfc_llcp_ns(s); |
1003 | ||
84457960 SO |
1004 | skb_unlink(s, &llcp_sock->tx_pending_queue); |
1005 | kfree_skb(s); | |
1006 | ||
28981491 | 1007 | if (n == nr) |
84457960 SO |
1008 | break; |
1009 | } | |
1010 | ||
1011 | /* Re-queue the remaining skbs for transmission */ | |
1012 | skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, | |
1013 | s, tmp) { | |
1014 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
1015 | skb_queue_head(&local->tx_queue, s); | |
1016 | } | |
d646960f SO |
1017 | } |
1018 | ||
53aef920 SO |
1019 | if (ptype == LLCP_PDU_RR) |
1020 | llcp_sock->remote_ready = true; | |
427a2eb1 | 1021 | else if (ptype == LLCP_PDU_RNR) |
53aef920 SO |
1022 | llcp_sock->remote_ready = false; |
1023 | ||
56af2568 | 1024 | if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) |
d094afa1 | 1025 | nfc_llcp_send_rr(llcp_sock); |
d646960f SO |
1026 | |
1027 | release_sock(sk); | |
1028 | nfc_llcp_sock_put(llcp_sock); | |
1029 | } | |
1030 | ||
1031 | static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, | |
427a2eb1 | 1032 | struct sk_buff *skb) |
d646960f SO |
1033 | { |
1034 | struct nfc_llcp_sock *llcp_sock; | |
1035 | struct sock *sk; | |
1036 | u8 dsap, ssap; | |
1037 | ||
1038 | dsap = nfc_llcp_dsap(skb); | |
1039 | ssap = nfc_llcp_ssap(skb); | |
1040 | ||
1041 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
1042 | if (llcp_sock == NULL) { | |
1043 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
1044 | return; | |
1045 | } | |
1046 | ||
1047 | sk = &llcp_sock->sk; | |
1048 | lock_sock(sk); | |
f31652a5 SO |
1049 | |
1050 | nfc_llcp_socket_purge(llcp_sock); | |
1051 | ||
d646960f SO |
1052 | if (sk->sk_state == LLCP_CLOSED) { |
1053 | release_sock(sk); | |
1054 | nfc_llcp_sock_put(llcp_sock); | |
1055 | } | |
1056 | ||
d646960f SO |
1057 | if (sk->sk_state == LLCP_CONNECTED) { |
1058 | nfc_put_device(local->dev); | |
1059 | sk->sk_state = LLCP_CLOSED; | |
1060 | sk->sk_state_change(sk); | |
1061 | } | |
1062 | ||
1063 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); | |
1064 | ||
1065 | release_sock(sk); | |
1066 | nfc_llcp_sock_put(llcp_sock); | |
1067 | } | |
1068 | ||
427a2eb1 | 1069 | static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) |
d646960f SO |
1070 | { |
1071 | struct nfc_llcp_sock *llcp_sock; | |
ff353d86 | 1072 | struct sock *sk; |
d646960f SO |
1073 | u8 dsap, ssap; |
1074 | ||
d646960f SO |
1075 | dsap = nfc_llcp_dsap(skb); |
1076 | ssap = nfc_llcp_ssap(skb); | |
1077 | ||
a69f32af | 1078 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); |
d646960f SO |
1079 | if (llcp_sock == NULL) { |
1080 | pr_err("Invalid CC\n"); | |
1081 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
1082 | ||
1083 | return; | |
1084 | } | |
1085 | ||
ff353d86 | 1086 | sk = &llcp_sock->sk; |
d646960f | 1087 | |
a69f32af SO |
1088 | /* Unlink from connecting and link to the client array */ |
1089 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
1090 | nfc_llcp_sock_link(&local->sockets, sk); | |
1091 | llcp_sock->dsap = ssap; | |
1092 | ||
7a06e586 SO |
1093 | nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], |
1094 | skb->len - LLCP_HEADER_SIZE); | |
d646960f | 1095 | |
ff353d86 SO |
1096 | sk->sk_state = LLCP_CONNECTED; |
1097 | sk->sk_state_change(sk); | |
1098 | ||
d646960f SO |
1099 | nfc_llcp_sock_put(llcp_sock); |
1100 | } | |
1101 | ||
5c0560b7 SO |
1102 | static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) |
1103 | { | |
1104 | struct nfc_llcp_sock *llcp_sock; | |
1105 | struct sock *sk; | |
1106 | u8 dsap, ssap, reason; | |
1107 | ||
1108 | dsap = nfc_llcp_dsap(skb); | |
1109 | ssap = nfc_llcp_ssap(skb); | |
1110 | reason = skb->data[2]; | |
1111 | ||
1112 | pr_debug("%d %d reason %d\n", ssap, dsap, reason); | |
1113 | ||
1114 | switch (reason) { | |
1115 | case LLCP_DM_NOBOUND: | |
1116 | case LLCP_DM_REJ: | |
1117 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); | |
1118 | break; | |
1119 | ||
1120 | default: | |
1121 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
1122 | break; | |
1123 | } | |
1124 | ||
1125 | if (llcp_sock == NULL) { | |
a8df0f37 | 1126 | pr_debug("Already closed\n"); |
5c0560b7 SO |
1127 | return; |
1128 | } | |
1129 | ||
1130 | sk = &llcp_sock->sk; | |
1131 | ||
1132 | sk->sk_err = ENXIO; | |
1133 | sk->sk_state = LLCP_CLOSED; | |
1134 | sk->sk_state_change(sk); | |
1135 | ||
1136 | nfc_llcp_sock_put(llcp_sock); | |
5c0560b7 SO |
1137 | } |
1138 | ||
19cfe584 SO |
1139 | static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, |
1140 | struct sk_buff *skb) | |
1141 | { | |
1142 | struct nfc_llcp_sock *llcp_sock; | |
1143 | u8 dsap, ssap, *tlv, type, length, tid, sap; | |
1144 | u16 tlv_len, offset; | |
1145 | char *service_name; | |
1146 | size_t service_name_len; | |
1147 | ||
1148 | dsap = nfc_llcp_dsap(skb); | |
1149 | ssap = nfc_llcp_ssap(skb); | |
1150 | ||
1151 | pr_debug("%d %d\n", dsap, ssap); | |
1152 | ||
1153 | if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { | |
1154 | pr_err("Wrong SNL SAP\n"); | |
1155 | return; | |
1156 | } | |
1157 | ||
1158 | tlv = &skb->data[LLCP_HEADER_SIZE]; | |
1159 | tlv_len = skb->len - LLCP_HEADER_SIZE; | |
1160 | offset = 0; | |
1161 | ||
0f450772 | 1162 | while (offset < tlv_len) { |
19cfe584 SO |
1163 | type = tlv[0]; |
1164 | length = tlv[1]; | |
1165 | ||
1166 | switch (type) { | |
1167 | case LLCP_TLV_SDREQ: | |
1168 | tid = tlv[2]; | |
1169 | service_name = (char *) &tlv[3]; | |
1170 | service_name_len = length - 1; | |
1171 | ||
e6904081 | 1172 | pr_debug("Looking for %.16s\n", service_name); |
19cfe584 SO |
1173 | |
1174 | if (service_name_len == strlen("urn:nfc:sn:sdp") && | |
1175 | !strncmp(service_name, "urn:nfc:sn:sdp", | |
1176 | service_name_len)) { | |
1177 | sap = 1; | |
e6904081 SO |
1178 | goto send_snl; |
1179 | } | |
1180 | ||
1181 | llcp_sock = nfc_llcp_sock_from_sn(local, service_name, | |
1182 | service_name_len); | |
1183 | if (!llcp_sock) { | |
1184 | sap = 0; | |
1185 | goto send_snl; | |
1186 | } | |
1187 | ||
1188 | /* | |
1189 | * We found a socket but its ssap has not been reserved | |
1190 | * yet. We need to assign it for good and send a reply. | |
1191 | * The ssap will be freed when the socket is closed. | |
1192 | */ | |
1193 | if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { | |
1194 | atomic_t *client_count; | |
1195 | ||
1196 | sap = nfc_llcp_reserve_sdp_ssap(local); | |
1197 | ||
1198 | pr_debug("Reserving %d\n", sap); | |
1199 | ||
1200 | if (sap == LLCP_SAP_MAX) { | |
1201 | sap = 0; | |
1202 | goto send_snl; | |
1203 | } | |
1204 | ||
1205 | client_count = | |
1206 | &local->local_sdp_cnt[sap - | |
1207 | LLCP_WKS_NUM_SAP]; | |
1208 | ||
1209 | atomic_inc(client_count); | |
1210 | ||
1211 | llcp_sock->ssap = sap; | |
1212 | llcp_sock->reserved_ssap = sap; | |
19cfe584 | 1213 | } else { |
e6904081 | 1214 | sap = llcp_sock->ssap; |
19cfe584 SO |
1215 | } |
1216 | ||
e6904081 SO |
1217 | pr_debug("%p %d\n", llcp_sock, sap); |
1218 | ||
0f450772 | 1219 | send_snl: |
19cfe584 SO |
1220 | nfc_llcp_send_snl(local, tid, sap); |
1221 | break; | |
1222 | ||
1223 | default: | |
1224 | pr_err("Invalid SNL tlv value 0x%x\n", type); | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | offset += length + 2; | |
1229 | tlv += length + 2; | |
1230 | } | |
1231 | } | |
1232 | ||
d646960f SO |
1233 | static void nfc_llcp_rx_work(struct work_struct *work) |
1234 | { | |
1235 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 1236 | rx_work); |
d646960f SO |
1237 | u8 dsap, ssap, ptype; |
1238 | struct sk_buff *skb; | |
1239 | ||
1240 | skb = local->rx_pending; | |
1241 | if (skb == NULL) { | |
1242 | pr_debug("No pending SKB\n"); | |
1243 | return; | |
1244 | } | |
1245 | ||
1246 | ptype = nfc_llcp_ptype(skb); | |
1247 | dsap = nfc_llcp_dsap(skb); | |
1248 | ssap = nfc_llcp_ssap(skb); | |
1249 | ||
1250 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
1251 | ||
4be646ec SO |
1252 | if (ptype != LLCP_PDU_SYMM) |
1253 | print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, | |
1254 | 16, 1, skb->data, skb->len, true); | |
1255 | ||
2c2d45bd TE |
1256 | __net_timestamp(skb); |
1257 | ||
4463523b TE |
1258 | nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); |
1259 | ||
d646960f SO |
1260 | switch (ptype) { |
1261 | case LLCP_PDU_SYMM: | |
1262 | pr_debug("SYMM\n"); | |
1263 | break; | |
1264 | ||
968272bf SO |
1265 | case LLCP_PDU_UI: |
1266 | pr_debug("UI\n"); | |
1267 | nfc_llcp_recv_ui(local, skb); | |
1268 | break; | |
1269 | ||
d646960f SO |
1270 | case LLCP_PDU_CONNECT: |
1271 | pr_debug("CONNECT\n"); | |
1272 | nfc_llcp_recv_connect(local, skb); | |
1273 | break; | |
1274 | ||
1275 | case LLCP_PDU_DISC: | |
1276 | pr_debug("DISC\n"); | |
1277 | nfc_llcp_recv_disc(local, skb); | |
1278 | break; | |
1279 | ||
1280 | case LLCP_PDU_CC: | |
1281 | pr_debug("CC\n"); | |
1282 | nfc_llcp_recv_cc(local, skb); | |
1283 | break; | |
1284 | ||
5c0560b7 SO |
1285 | case LLCP_PDU_DM: |
1286 | pr_debug("DM\n"); | |
1287 | nfc_llcp_recv_dm(local, skb); | |
1288 | break; | |
1289 | ||
19cfe584 SO |
1290 | case LLCP_PDU_SNL: |
1291 | pr_debug("SNL\n"); | |
1292 | nfc_llcp_recv_snl(local, skb); | |
1293 | break; | |
1294 | ||
d646960f SO |
1295 | case LLCP_PDU_I: |
1296 | case LLCP_PDU_RR: | |
53aef920 | 1297 | case LLCP_PDU_RNR: |
d646960f SO |
1298 | pr_debug("I frame\n"); |
1299 | nfc_llcp_recv_hdlc(local, skb); | |
1300 | break; | |
1301 | ||
1302 | } | |
1303 | ||
916082b0 | 1304 | schedule_work(&local->tx_work); |
d646960f SO |
1305 | kfree_skb(local->rx_pending); |
1306 | local->rx_pending = NULL; | |
d646960f SO |
1307 | } |
1308 | ||
1727cf93 SO |
1309 | static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb) |
1310 | { | |
1311 | local->rx_pending = skb; | |
1312 | del_timer(&local->link_timer); | |
1313 | schedule_work(&local->rx_work); | |
1314 | } | |
1315 | ||
d646960f SO |
1316 | void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) |
1317 | { | |
1318 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
1319 | ||
1320 | pr_debug("Received an LLCP PDU\n"); | |
1321 | if (err < 0) { | |
427a2eb1 | 1322 | pr_err("err %d\n", err); |
d646960f SO |
1323 | return; |
1324 | } | |
1325 | ||
1727cf93 | 1326 | __nfc_llcp_recv(local, skb); |
d646960f SO |
1327 | } |
1328 | ||
73167ced SO |
1329 | int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
1330 | { | |
1331 | struct nfc_llcp_local *local; | |
1332 | ||
1333 | local = nfc_llcp_find_local(dev); | |
1334 | if (local == NULL) | |
1335 | return -ENODEV; | |
1336 | ||
1727cf93 | 1337 | __nfc_llcp_recv(local, skb); |
73167ced SO |
1338 | |
1339 | return 0; | |
1340 | } | |
1341 | ||
d646960f SO |
1342 | void nfc_llcp_mac_is_down(struct nfc_dev *dev) |
1343 | { | |
1344 | struct nfc_llcp_local *local; | |
1345 | ||
1346 | local = nfc_llcp_find_local(dev); | |
1347 | if (local == NULL) | |
1348 | return; | |
1349 | ||
1350 | /* Close and purge all existing sockets */ | |
4d22ea15 | 1351 | nfc_llcp_socket_release(local, true); |
d646960f SO |
1352 | } |
1353 | ||
1354 | void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, | |
1355 | u8 comm_mode, u8 rf_mode) | |
1356 | { | |
1357 | struct nfc_llcp_local *local; | |
1358 | ||
1359 | pr_debug("rf mode %d\n", rf_mode); | |
1360 | ||
1361 | local = nfc_llcp_find_local(dev); | |
1362 | if (local == NULL) | |
1363 | return; | |
1364 | ||
1365 | local->target_idx = target_idx; | |
1366 | local->comm_mode = comm_mode; | |
1367 | local->rf_mode = rf_mode; | |
1368 | ||
1369 | if (rf_mode == NFC_RF_INITIATOR) { | |
1370 | pr_debug("Queueing Tx work\n"); | |
1371 | ||
916082b0 | 1372 | schedule_work(&local->tx_work); |
d646960f SO |
1373 | } else { |
1374 | mod_timer(&local->link_timer, | |
427a2eb1 | 1375 | jiffies + msecs_to_jiffies(local->remote_lto)); |
d646960f SO |
1376 | } |
1377 | } | |
1378 | ||
1379 | int nfc_llcp_register_device(struct nfc_dev *ndev) | |
1380 | { | |
d646960f | 1381 | struct nfc_llcp_local *local; |
d646960f SO |
1382 | |
1383 | local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); | |
1384 | if (local == NULL) | |
1385 | return -ENOMEM; | |
1386 | ||
1387 | local->dev = ndev; | |
1388 | INIT_LIST_HEAD(&local->list); | |
c7aa1225 | 1389 | kref_init(&local->ref); |
d646960f | 1390 | mutex_init(&local->sdp_lock); |
d646960f SO |
1391 | init_timer(&local->link_timer); |
1392 | local->link_timer.data = (unsigned long) local; | |
1393 | local->link_timer.function = nfc_llcp_symm_timer; | |
1394 | ||
1395 | skb_queue_head_init(&local->tx_queue); | |
1396 | INIT_WORK(&local->tx_work, nfc_llcp_tx_work); | |
d646960f SO |
1397 | |
1398 | local->rx_pending = NULL; | |
1399 | INIT_WORK(&local->rx_work, nfc_llcp_rx_work); | |
d646960f SO |
1400 | |
1401 | INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); | |
d646960f | 1402 | |
fe235b58 SJ |
1403 | rwlock_init(&local->sockets.lock); |
1404 | rwlock_init(&local->connecting_sockets.lock); | |
4463523b | 1405 | rwlock_init(&local->raw_sockets.lock); |
a69f32af | 1406 | |
52feb444 TE |
1407 | local->lto = 150; /* 1500 ms */ |
1408 | local->rw = LLCP_MAX_RW; | |
1409 | local->miux = cpu_to_be16(LLCP_MAX_MIUX); | |
1410 | ||
d646960f SO |
1411 | nfc_llcp_build_gb(local); |
1412 | ||
1413 | local->remote_miu = LLCP_DEFAULT_MIU; | |
1414 | local->remote_lto = LLCP_DEFAULT_LTO; | |
d646960f | 1415 | |
16a78e9f | 1416 | list_add(&local->list, &llcp_devices); |
d646960f | 1417 | |
d646960f SO |
1418 | return 0; |
1419 | } | |
1420 | ||
1421 | void nfc_llcp_unregister_device(struct nfc_dev *dev) | |
1422 | { | |
1423 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
1424 | ||
1425 | if (local == NULL) { | |
1426 | pr_debug("No such device\n"); | |
1427 | return; | |
1428 | } | |
1429 | ||
c7aa1225 | 1430 | nfc_llcp_local_put(local); |
d646960f SO |
1431 | } |
1432 | ||
1433 | int __init nfc_llcp_init(void) | |
1434 | { | |
1435 | INIT_LIST_HEAD(&llcp_devices); | |
1436 | ||
1437 | return nfc_llcp_sock_init(); | |
1438 | } | |
1439 | ||
1440 | void nfc_llcp_exit(void) | |
1441 | { | |
1442 | nfc_llcp_sock_exit(); | |
1443 | } |