Commit | Line | Data |
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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 | |
50b78b2a | 59 | bh_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 | 70 | accept_sk = &lsk->sk; |
50b78b2a | 71 | bh_lock_sock(accept_sk); |
d646960f SO |
72 | |
73 | nfc_llcp_accept_unlink(accept_sk); | |
74 | ||
75 | accept_sk->sk_state = LLCP_CLOSED; | |
d646960f | 76 | |
50b78b2a | 77 | bh_unlock_sock(accept_sk); |
d646960f SO |
78 | |
79 | sock_orphan(accept_sk); | |
80 | } | |
4d22ea15 SO |
81 | |
82 | if (listen == true) { | |
50b78b2a | 83 | bh_unlock_sock(sk); |
4d22ea15 SO |
84 | continue; |
85 | } | |
d646960f SO |
86 | } |
87 | ||
a69f32af | 88 | sk->sk_state = LLCP_CLOSED; |
d646960f | 89 | |
50b78b2a | 90 | bh_unlock_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); | |
474fee3d TH |
117 | cancel_work_sync(&local->tx_work); |
118 | cancel_work_sync(&local->rx_work); | |
119 | cancel_work_sync(&local->timeout_work); | |
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 | ||
916082b0 | 184 | schedule_work(&local->timeout_work); |
d646960f SO |
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 | ||
54292d64 SO |
252 | if (tmp_sock->sk.sk_type == SOCK_STREAM && |
253 | tmp_sock->sk.sk_state != LLCP_LISTEN) | |
254 | continue; | |
255 | ||
256 | if (tmp_sock->sk.sk_type == SOCK_DGRAM && | |
257 | tmp_sock->sk.sk_state != LLCP_BOUND) | |
8f50020e SO |
258 | continue; |
259 | ||
260 | if (tmp_sock->service_name == NULL || | |
261 | tmp_sock->service_name_len == 0) | |
262 | continue; | |
263 | ||
264 | if (tmp_sock->service_name_len != sn_len) | |
265 | continue; | |
266 | ||
267 | if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) { | |
268 | llcp_sock = tmp_sock; | |
269 | break; | |
270 | } | |
271 | } | |
272 | ||
273 | read_unlock(&local->sockets.lock); | |
274 | ||
275 | pr_debug("Found llcp sock %p\n", llcp_sock); | |
276 | ||
277 | return llcp_sock; | |
278 | } | |
279 | ||
d646960f | 280 | u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, |
427a2eb1 | 281 | struct nfc_llcp_sock *sock) |
d646960f SO |
282 | { |
283 | mutex_lock(&local->sdp_lock); | |
284 | ||
285 | if (sock->service_name != NULL && sock->service_name_len > 0) { | |
286 | int ssap = nfc_llcp_wks_sap(sock->service_name, | |
427a2eb1 | 287 | sock->service_name_len); |
d646960f SO |
288 | |
289 | if (ssap > 0) { | |
290 | pr_debug("WKS %d\n", ssap); | |
291 | ||
292 | /* This is a WKS, let's check if it's free */ | |
293 | if (local->local_wks & BIT(ssap)) { | |
294 | mutex_unlock(&local->sdp_lock); | |
295 | ||
296 | return LLCP_SAP_MAX; | |
297 | } | |
298 | ||
1762c17c | 299 | set_bit(ssap, &local->local_wks); |
d646960f SO |
300 | mutex_unlock(&local->sdp_lock); |
301 | ||
302 | return ssap; | |
303 | } | |
304 | ||
305 | /* | |
8f50020e SO |
306 | * Check if there already is a non WKS socket bound |
307 | * to this service name. | |
d646960f | 308 | */ |
8f50020e SO |
309 | if (nfc_llcp_sock_from_sn(local, sock->service_name, |
310 | sock->service_name_len) != NULL) { | |
d646960f SO |
311 | mutex_unlock(&local->sdp_lock); |
312 | ||
313 | return LLCP_SAP_MAX; | |
314 | } | |
315 | ||
d646960f SO |
316 | mutex_unlock(&local->sdp_lock); |
317 | ||
8f50020e | 318 | return LLCP_SDP_UNBOUND; |
d646960f | 319 | |
ebbb16d9 SO |
320 | } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) { |
321 | if (!test_bit(sock->ssap, &local->local_wks)) { | |
322 | set_bit(sock->ssap, &local->local_wks); | |
323 | mutex_unlock(&local->sdp_lock); | |
d646960f | 324 | |
ebbb16d9 | 325 | return sock->ssap; |
d646960f SO |
326 | } |
327 | } | |
328 | ||
329 | mutex_unlock(&local->sdp_lock); | |
330 | ||
331 | return LLCP_SAP_MAX; | |
332 | } | |
333 | ||
334 | u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) | |
335 | { | |
336 | u8 local_ssap; | |
337 | ||
338 | mutex_lock(&local->sdp_lock); | |
339 | ||
340 | local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); | |
341 | if (local_ssap == LLCP_LOCAL_NUM_SAP) { | |
342 | mutex_unlock(&local->sdp_lock); | |
343 | return LLCP_SAP_MAX; | |
344 | } | |
345 | ||
1762c17c | 346 | set_bit(local_ssap, &local->local_sap); |
d646960f SO |
347 | |
348 | mutex_unlock(&local->sdp_lock); | |
349 | ||
350 | return local_ssap + LLCP_LOCAL_SAP_OFFSET; | |
351 | } | |
352 | ||
353 | void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) | |
354 | { | |
355 | u8 local_ssap; | |
356 | unsigned long *sdp; | |
357 | ||
358 | if (ssap < LLCP_WKS_NUM_SAP) { | |
359 | local_ssap = ssap; | |
360 | sdp = &local->local_wks; | |
361 | } else if (ssap < LLCP_LOCAL_NUM_SAP) { | |
8f50020e SO |
362 | atomic_t *client_cnt; |
363 | ||
d646960f SO |
364 | local_ssap = ssap - LLCP_WKS_NUM_SAP; |
365 | sdp = &local->local_sdp; | |
8f50020e SO |
366 | client_cnt = &local->local_sdp_cnt[local_ssap]; |
367 | ||
368 | pr_debug("%d clients\n", atomic_read(client_cnt)); | |
369 | ||
370 | mutex_lock(&local->sdp_lock); | |
371 | ||
372 | if (atomic_dec_and_test(client_cnt)) { | |
373 | struct nfc_llcp_sock *l_sock; | |
374 | ||
375 | pr_debug("No more clients for SAP %d\n", ssap); | |
376 | ||
377 | clear_bit(local_ssap, sdp); | |
378 | ||
379 | /* Find the listening sock and set it back to UNBOUND */ | |
380 | l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP); | |
381 | if (l_sock) { | |
382 | l_sock->ssap = LLCP_SDP_UNBOUND; | |
383 | nfc_llcp_sock_put(l_sock); | |
384 | } | |
385 | } | |
386 | ||
387 | mutex_unlock(&local->sdp_lock); | |
388 | ||
389 | return; | |
d646960f SO |
390 | } else if (ssap < LLCP_MAX_SAP) { |
391 | local_ssap = ssap - LLCP_LOCAL_NUM_SAP; | |
392 | sdp = &local->local_sap; | |
393 | } else { | |
394 | return; | |
395 | } | |
396 | ||
397 | mutex_lock(&local->sdp_lock); | |
398 | ||
1762c17c | 399 | clear_bit(local_ssap, sdp); |
d646960f SO |
400 | |
401 | mutex_unlock(&local->sdp_lock); | |
402 | } | |
403 | ||
8f50020e SO |
404 | static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local) |
405 | { | |
406 | u8 ssap; | |
407 | ||
408 | mutex_lock(&local->sdp_lock); | |
409 | ||
410 | ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); | |
411 | if (ssap == LLCP_SDP_NUM_SAP) { | |
412 | mutex_unlock(&local->sdp_lock); | |
413 | ||
414 | return LLCP_SAP_MAX; | |
415 | } | |
416 | ||
417 | pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); | |
418 | ||
419 | set_bit(ssap, &local->local_sdp); | |
420 | ||
421 | mutex_unlock(&local->sdp_lock); | |
422 | ||
423 | return LLCP_WKS_NUM_SAP + ssap; | |
424 | } | |
425 | ||
d646960f SO |
426 | static int nfc_llcp_build_gb(struct nfc_llcp_local *local) |
427 | { | |
428 | u8 *gb_cur, *version_tlv, version, version_length; | |
429 | u8 *lto_tlv, lto, lto_length; | |
430 | u8 *wks_tlv, wks_length; | |
56d5876a SO |
431 | u8 *miux_tlv, miux_length; |
432 | __be16 miux; | |
d646960f | 433 | u8 gb_len = 0; |
52da2449 | 434 | int ret = 0; |
d646960f SO |
435 | |
436 | version = LLCP_VERSION_11; | |
437 | version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, | |
427a2eb1 | 438 | 1, &version_length); |
d646960f SO |
439 | gb_len += version_length; |
440 | ||
441 | /* 1500 ms */ | |
442 | lto = 150; | |
91b0ade1 | 443 | lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, <o, 1, <o_length); |
d646960f SO |
444 | gb_len += lto_length; |
445 | ||
446 | pr_debug("Local wks 0x%lx\n", local->local_wks); | |
447 | wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, | |
427a2eb1 | 448 | &wks_length); |
d646960f SO |
449 | gb_len += wks_length; |
450 | ||
56d5876a SO |
451 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
452 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
453 | &miux_length); | |
454 | gb_len += miux_length; | |
455 | ||
d646960f SO |
456 | gb_len += ARRAY_SIZE(llcp_magic); |
457 | ||
458 | if (gb_len > NFC_MAX_GT_LEN) { | |
52da2449 WY |
459 | ret = -EINVAL; |
460 | goto out; | |
d646960f SO |
461 | } |
462 | ||
463 | gb_cur = local->gb; | |
464 | ||
465 | memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); | |
466 | gb_cur += ARRAY_SIZE(llcp_magic); | |
467 | ||
468 | memcpy(gb_cur, version_tlv, version_length); | |
469 | gb_cur += version_length; | |
470 | ||
471 | memcpy(gb_cur, lto_tlv, lto_length); | |
472 | gb_cur += lto_length; | |
473 | ||
474 | memcpy(gb_cur, wks_tlv, wks_length); | |
475 | gb_cur += wks_length; | |
476 | ||
56d5876a SO |
477 | memcpy(gb_cur, miux_tlv, miux_length); |
478 | gb_cur += miux_length; | |
479 | ||
52da2449 WY |
480 | local->gb_len = gb_len; |
481 | ||
482 | out: | |
d646960f SO |
483 | kfree(version_tlv); |
484 | kfree(lto_tlv); | |
52da2449 WY |
485 | kfree(wks_tlv); |
486 | kfree(miux_tlv); | |
d646960f | 487 | |
52da2449 | 488 | return ret; |
d646960f SO |
489 | } |
490 | ||
b8e7a06d SO |
491 | u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) |
492 | { | |
493 | struct nfc_llcp_local *local; | |
494 | ||
495 | local = nfc_llcp_find_local(dev); | |
496 | if (local == NULL) { | |
497 | *general_bytes_len = 0; | |
498 | return NULL; | |
499 | } | |
500 | ||
501 | nfc_llcp_build_gb(local); | |
502 | ||
503 | *general_bytes_len = local->gb_len; | |
504 | ||
505 | return local->gb; | |
506 | } | |
507 | ||
d646960f SO |
508 | int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) |
509 | { | |
510 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
511 | ||
512 | if (local == NULL) { | |
513 | pr_err("No LLCP device\n"); | |
514 | return -ENODEV; | |
515 | } | |
516 | ||
517 | memset(local->remote_gb, 0, NFC_MAX_GT_LEN); | |
518 | memcpy(local->remote_gb, gb, gb_len); | |
519 | local->remote_gb_len = gb_len; | |
520 | ||
427a2eb1 | 521 | if (local->remote_gb == NULL || local->remote_gb_len == 0) |
d646960f SO |
522 | return -ENODEV; |
523 | ||
524 | if (memcmp(local->remote_gb, llcp_magic, 3)) { | |
525 | pr_err("MAC does not support LLCP\n"); | |
526 | return -EINVAL; | |
527 | } | |
528 | ||
7a06e586 SO |
529 | return nfc_llcp_parse_gb_tlv(local, |
530 | &local->remote_gb[3], | |
531 | local->remote_gb_len - 3); | |
d646960f SO |
532 | } |
533 | ||
d646960f SO |
534 | static u8 nfc_llcp_dsap(struct sk_buff *pdu) |
535 | { | |
536 | return (pdu->data[0] & 0xfc) >> 2; | |
537 | } | |
538 | ||
539 | static u8 nfc_llcp_ptype(struct sk_buff *pdu) | |
540 | { | |
541 | return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); | |
542 | } | |
543 | ||
544 | static u8 nfc_llcp_ssap(struct sk_buff *pdu) | |
545 | { | |
546 | return pdu->data[1] & 0x3f; | |
547 | } | |
548 | ||
549 | static u8 nfc_llcp_ns(struct sk_buff *pdu) | |
550 | { | |
551 | return pdu->data[2] >> 4; | |
552 | } | |
553 | ||
554 | static u8 nfc_llcp_nr(struct sk_buff *pdu) | |
555 | { | |
556 | return pdu->data[2] & 0xf; | |
557 | } | |
558 | ||
559 | static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) | |
560 | { | |
279cf174 | 561 | pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); |
d646960f SO |
562 | sock->send_n = (sock->send_n + 1) % 16; |
563 | sock->recv_ack_n = (sock->recv_n - 1) % 16; | |
564 | } | |
565 | ||
4463523b TE |
566 | void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local, |
567 | struct sk_buff *skb, u8 direction) | |
568 | { | |
569 | struct hlist_node *node; | |
570 | struct sk_buff *skb_copy = NULL, *nskb; | |
571 | struct sock *sk; | |
572 | u8 *data; | |
573 | ||
574 | read_lock(&local->raw_sockets.lock); | |
575 | ||
576 | sk_for_each(sk, node, &local->raw_sockets.head) { | |
577 | if (sk->sk_state != LLCP_BOUND) | |
578 | continue; | |
579 | ||
580 | if (skb_copy == NULL) { | |
581 | skb_copy = __pskb_copy(skb, NFC_LLCP_RAW_HEADER_SIZE, | |
582 | GFP_ATOMIC); | |
583 | ||
584 | if (skb_copy == NULL) | |
585 | continue; | |
586 | ||
587 | data = skb_push(skb_copy, NFC_LLCP_RAW_HEADER_SIZE); | |
588 | ||
589 | data[0] = local->dev ? local->dev->idx : 0xFF; | |
590 | data[1] = direction; | |
591 | } | |
592 | ||
593 | nskb = skb_clone(skb_copy, GFP_ATOMIC); | |
594 | if (!nskb) | |
595 | continue; | |
596 | ||
597 | if (sock_queue_rcv_skb(sk, nskb)) | |
598 | kfree_skb(nskb); | |
599 | } | |
600 | ||
601 | read_unlock(&local->raw_sockets.lock); | |
602 | ||
603 | kfree_skb(skb_copy); | |
604 | } | |
605 | ||
84457960 SO |
606 | static void nfc_llcp_tx_work(struct work_struct *work) |
607 | { | |
608 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
609 | tx_work); | |
610 | struct sk_buff *skb; | |
611 | struct sock *sk; | |
612 | struct nfc_llcp_sock *llcp_sock; | |
613 | ||
614 | skb = skb_dequeue(&local->tx_queue); | |
615 | if (skb != NULL) { | |
616 | sk = skb->sk; | |
617 | llcp_sock = nfc_llcp_sock(sk); | |
a6a0915f SO |
618 | |
619 | if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) { | |
620 | nfc_llcp_send_symm(local->dev); | |
621 | } else { | |
84457960 SO |
622 | int ret; |
623 | ||
624 | pr_debug("Sending pending skb\n"); | |
625 | print_hex_dump(KERN_DEBUG, "LLCP Tx: ", | |
626 | DUMP_PREFIX_OFFSET, 16, 1, | |
627 | skb->data, skb->len, true); | |
628 | ||
4463523b TE |
629 | nfc_llcp_send_to_raw_sock(local, skb, |
630 | NFC_LLCP_DIRECTION_TX); | |
631 | ||
84457960 SO |
632 | ret = nfc_data_exchange(local->dev, local->target_idx, |
633 | skb, nfc_llcp_recv, local); | |
634 | ||
635 | if (!ret && nfc_llcp_ptype(skb) == LLCP_PDU_I) { | |
636 | skb = skb_get(skb); | |
637 | skb_queue_tail(&llcp_sock->tx_pending_queue, | |
638 | skb); | |
639 | } | |
84457960 SO |
640 | } |
641 | } else { | |
642 | nfc_llcp_send_symm(local->dev); | |
643 | } | |
644 | ||
645 | mod_timer(&local->link_timer, | |
646 | jiffies + msecs_to_jiffies(2 * local->remote_lto)); | |
647 | } | |
648 | ||
a69f32af SO |
649 | static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local, |
650 | u8 ssap) | |
651 | { | |
652 | struct sock *sk; | |
653 | struct nfc_llcp_sock *llcp_sock; | |
654 | struct hlist_node *node; | |
655 | ||
656 | read_lock(&local->connecting_sockets.lock); | |
657 | ||
658 | sk_for_each(sk, node, &local->connecting_sockets.head) { | |
659 | llcp_sock = nfc_llcp_sock(sk); | |
660 | ||
5a0f6f3b SO |
661 | if (llcp_sock->ssap == ssap) { |
662 | sock_hold(&llcp_sock->sk); | |
a69f32af | 663 | goto out; |
5a0f6f3b | 664 | } |
a69f32af SO |
665 | } |
666 | ||
667 | llcp_sock = NULL; | |
668 | ||
669 | out: | |
670 | read_unlock(&local->connecting_sockets.lock); | |
671 | ||
a69f32af SO |
672 | return llcp_sock; |
673 | } | |
674 | ||
a69f32af SO |
675 | static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local, |
676 | u8 *sn, size_t sn_len) | |
677 | { | |
a69f32af SO |
678 | struct nfc_llcp_sock *llcp_sock; |
679 | ||
8f50020e | 680 | llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len); |
d646960f | 681 | |
a69f32af SO |
682 | if (llcp_sock == NULL) |
683 | return NULL; | |
d646960f | 684 | |
a69f32af SO |
685 | sock_hold(&llcp_sock->sk); |
686 | ||
687 | return llcp_sock; | |
d646960f SO |
688 | } |
689 | ||
d646960f SO |
690 | static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) |
691 | { | |
692 | u8 *tlv = &skb->data[2], type, length; | |
693 | size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; | |
694 | ||
695 | while (offset < tlv_array_len) { | |
696 | type = tlv[0]; | |
697 | length = tlv[1]; | |
698 | ||
699 | pr_debug("type 0x%x length %d\n", type, length); | |
700 | ||
701 | if (type == LLCP_TLV_SN) { | |
702 | *sn_len = length; | |
703 | return &tlv[2]; | |
704 | } | |
705 | ||
706 | offset += length + 2; | |
707 | tlv += length + 2; | |
708 | } | |
709 | ||
710 | return NULL; | |
711 | } | |
712 | ||
713 | static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, | |
427a2eb1 | 714 | struct sk_buff *skb) |
d646960f SO |
715 | { |
716 | struct sock *new_sk, *parent; | |
717 | struct nfc_llcp_sock *sock, *new_sock; | |
a69f32af | 718 | u8 dsap, ssap, reason; |
d646960f SO |
719 | |
720 | dsap = nfc_llcp_dsap(skb); | |
721 | ssap = nfc_llcp_ssap(skb); | |
722 | ||
723 | pr_debug("%d %d\n", dsap, ssap); | |
724 | ||
d646960f | 725 | if (dsap != LLCP_SAP_SDP) { |
a69f32af SO |
726 | sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); |
727 | if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) { | |
d646960f SO |
728 | reason = LLCP_DM_NOBOUND; |
729 | goto fail; | |
730 | } | |
d646960f SO |
731 | } else { |
732 | u8 *sn; | |
733 | size_t sn_len; | |
734 | ||
735 | sn = nfc_llcp_connect_sn(skb, &sn_len); | |
736 | if (sn == NULL) { | |
737 | reason = LLCP_DM_NOBOUND; | |
738 | goto fail; | |
739 | } | |
740 | ||
741 | pr_debug("Service name length %zu\n", sn_len); | |
742 | ||
a69f32af SO |
743 | sock = nfc_llcp_sock_get_sn(local, sn, sn_len); |
744 | if (sock == NULL) { | |
745 | reason = LLCP_DM_NOBOUND; | |
746 | goto fail; | |
d646960f | 747 | } |
d646960f SO |
748 | } |
749 | ||
a69f32af | 750 | lock_sock(&sock->sk); |
d646960f | 751 | |
d646960f SO |
752 | parent = &sock->sk; |
753 | ||
754 | if (sk_acceptq_is_full(parent)) { | |
755 | reason = LLCP_DM_REJ; | |
756 | release_sock(&sock->sk); | |
757 | sock_put(&sock->sk); | |
758 | goto fail; | |
759 | } | |
760 | ||
8f50020e SO |
761 | if (sock->ssap == LLCP_SDP_UNBOUND) { |
762 | u8 ssap = nfc_llcp_reserve_sdp_ssap(local); | |
763 | ||
764 | pr_debug("First client, reserving %d\n", ssap); | |
765 | ||
766 | if (ssap == LLCP_SAP_MAX) { | |
767 | reason = LLCP_DM_REJ; | |
768 | release_sock(&sock->sk); | |
769 | sock_put(&sock->sk); | |
770 | goto fail; | |
771 | } | |
772 | ||
773 | sock->ssap = ssap; | |
774 | } | |
775 | ||
427a2eb1 | 776 | new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); |
d646960f SO |
777 | if (new_sk == NULL) { |
778 | reason = LLCP_DM_REJ; | |
779 | release_sock(&sock->sk); | |
780 | sock_put(&sock->sk); | |
781 | goto fail; | |
782 | } | |
783 | ||
784 | new_sock = nfc_llcp_sock(new_sk); | |
785 | new_sock->dev = local->dev; | |
c7aa1225 | 786 | new_sock->local = nfc_llcp_local_get(local); |
93d7e490 | 787 | new_sock->miu = local->remote_miu; |
d646960f | 788 | new_sock->nfc_protocol = sock->nfc_protocol; |
d646960f | 789 | new_sock->dsap = ssap; |
025f1520 | 790 | new_sock->target_idx = local->target_idx; |
d646960f | 791 | new_sock->parent = parent; |
8f50020e SO |
792 | new_sock->ssap = sock->ssap; |
793 | if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) { | |
794 | atomic_t *client_count; | |
795 | ||
796 | pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock); | |
797 | ||
798 | client_count = | |
799 | &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP]; | |
800 | ||
801 | atomic_inc(client_count); | |
802 | new_sock->reserved_ssap = sock->ssap; | |
803 | } | |
d646960f | 804 | |
7a06e586 SO |
805 | nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE], |
806 | skb->len - LLCP_HEADER_SIZE); | |
807 | ||
d646960f SO |
808 | pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); |
809 | ||
a69f32af | 810 | nfc_llcp_sock_link(&local->sockets, new_sk); |
d646960f SO |
811 | |
812 | nfc_llcp_accept_enqueue(&sock->sk, new_sk); | |
813 | ||
814 | nfc_get_device(local->dev->idx); | |
815 | ||
816 | new_sk->sk_state = LLCP_CONNECTED; | |
817 | ||
818 | /* Wake the listening processes */ | |
819 | parent->sk_data_ready(parent, 0); | |
820 | ||
821 | /* Send CC */ | |
822 | nfc_llcp_send_cc(new_sock); | |
823 | ||
824 | release_sock(&sock->sk); | |
825 | sock_put(&sock->sk); | |
826 | ||
827 | return; | |
828 | ||
829 | fail: | |
830 | /* Send DM */ | |
831 | nfc_llcp_send_dm(local, dsap, ssap, reason); | |
d646960f SO |
832 | } |
833 | ||
d094afa1 | 834 | int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) |
4722d2b7 | 835 | { |
d094afa1 | 836 | int nr_frames = 0; |
4722d2b7 SO |
837 | struct nfc_llcp_local *local = sock->local; |
838 | ||
839 | pr_debug("Remote ready %d tx queue len %d remote rw %d", | |
427a2eb1 | 840 | sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), |
7a06e586 | 841 | sock->rw); |
4722d2b7 SO |
842 | |
843 | /* Try to queue some I frames for transmission */ | |
844 | while (sock->remote_ready && | |
7a06e586 | 845 | skb_queue_len(&sock->tx_pending_queue) < sock->rw) { |
84457960 | 846 | struct sk_buff *pdu; |
4722d2b7 SO |
847 | |
848 | pdu = skb_dequeue(&sock->tx_queue); | |
849 | if (pdu == NULL) | |
850 | break; | |
851 | ||
852 | /* Update N(S)/N(R) */ | |
853 | nfc_llcp_set_nrns(sock, pdu); | |
854 | ||
4722d2b7 | 855 | skb_queue_tail(&local->tx_queue, pdu); |
d094afa1 | 856 | nr_frames++; |
4722d2b7 | 857 | } |
d094afa1 SO |
858 | |
859 | return nr_frames; | |
4722d2b7 SO |
860 | } |
861 | ||
d646960f | 862 | static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, |
427a2eb1 | 863 | struct sk_buff *skb) |
d646960f SO |
864 | { |
865 | struct nfc_llcp_sock *llcp_sock; | |
866 | struct sock *sk; | |
867 | u8 dsap, ssap, ptype, ns, nr; | |
868 | ||
869 | ptype = nfc_llcp_ptype(skb); | |
870 | dsap = nfc_llcp_dsap(skb); | |
871 | ssap = nfc_llcp_ssap(skb); | |
872 | ns = nfc_llcp_ns(skb); | |
873 | nr = nfc_llcp_nr(skb); | |
874 | ||
875 | pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); | |
876 | ||
877 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
878 | if (llcp_sock == NULL) { | |
879 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
880 | return; | |
881 | } | |
882 | ||
883 | sk = &llcp_sock->sk; | |
884 | lock_sock(sk); | |
885 | if (sk->sk_state == LLCP_CLOSED) { | |
886 | release_sock(sk); | |
887 | nfc_llcp_sock_put(llcp_sock); | |
888 | } | |
889 | ||
d646960f SO |
890 | /* Pass the payload upstream */ |
891 | if (ptype == LLCP_PDU_I) { | |
892 | pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); | |
893 | ||
53aef920 SO |
894 | if (ns == llcp_sock->recv_n) |
895 | llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; | |
896 | else | |
897 | pr_err("Received out of sequence I PDU\n"); | |
898 | ||
d646960f SO |
899 | skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
900 | if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) { | |
901 | pr_err("receive queue is full\n"); | |
902 | skb_queue_head(&llcp_sock->tx_backlog_queue, skb); | |
903 | } | |
904 | } | |
905 | ||
906 | /* Remove skbs from the pending queue */ | |
907 | if (llcp_sock->send_ack_n != nr) { | |
908 | struct sk_buff *s, *tmp; | |
909 | ||
910 | llcp_sock->send_ack_n = nr; | |
911 | ||
84457960 SO |
912 | /* Remove and free all skbs until ns == nr */ |
913 | skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) { | |
914 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
915 | kfree_skb(s); | |
916 | ||
917 | if (nfc_llcp_ns(s) == nr) | |
918 | break; | |
919 | } | |
920 | ||
921 | /* Re-queue the remaining skbs for transmission */ | |
922 | skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue, | |
923 | s, tmp) { | |
924 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
925 | skb_queue_head(&local->tx_queue, s); | |
926 | } | |
d646960f SO |
927 | } |
928 | ||
53aef920 SO |
929 | if (ptype == LLCP_PDU_RR) |
930 | llcp_sock->remote_ready = true; | |
427a2eb1 | 931 | else if (ptype == LLCP_PDU_RNR) |
53aef920 SO |
932 | llcp_sock->remote_ready = false; |
933 | ||
56af2568 | 934 | if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I) |
d094afa1 | 935 | nfc_llcp_send_rr(llcp_sock); |
d646960f SO |
936 | |
937 | release_sock(sk); | |
938 | nfc_llcp_sock_put(llcp_sock); | |
939 | } | |
940 | ||
941 | static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, | |
427a2eb1 | 942 | struct sk_buff *skb) |
d646960f SO |
943 | { |
944 | struct nfc_llcp_sock *llcp_sock; | |
945 | struct sock *sk; | |
946 | u8 dsap, ssap; | |
947 | ||
948 | dsap = nfc_llcp_dsap(skb); | |
949 | ssap = nfc_llcp_ssap(skb); | |
950 | ||
951 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
952 | if (llcp_sock == NULL) { | |
953 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
954 | return; | |
955 | } | |
956 | ||
957 | sk = &llcp_sock->sk; | |
958 | lock_sock(sk); | |
959 | if (sk->sk_state == LLCP_CLOSED) { | |
960 | release_sock(sk); | |
961 | nfc_llcp_sock_put(llcp_sock); | |
962 | } | |
963 | ||
d646960f SO |
964 | if (sk->sk_state == LLCP_CONNECTED) { |
965 | nfc_put_device(local->dev); | |
966 | sk->sk_state = LLCP_CLOSED; | |
967 | sk->sk_state_change(sk); | |
968 | } | |
969 | ||
970 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); | |
971 | ||
972 | release_sock(sk); | |
973 | nfc_llcp_sock_put(llcp_sock); | |
974 | } | |
975 | ||
427a2eb1 | 976 | static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) |
d646960f SO |
977 | { |
978 | struct nfc_llcp_sock *llcp_sock; | |
ff353d86 | 979 | struct sock *sk; |
d646960f SO |
980 | u8 dsap, ssap; |
981 | ||
d646960f SO |
982 | dsap = nfc_llcp_dsap(skb); |
983 | ssap = nfc_llcp_ssap(skb); | |
984 | ||
a69f32af | 985 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); |
d646960f SO |
986 | if (llcp_sock == NULL) { |
987 | pr_err("Invalid CC\n"); | |
988 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
989 | ||
990 | return; | |
991 | } | |
992 | ||
ff353d86 | 993 | sk = &llcp_sock->sk; |
d646960f | 994 | |
a69f32af SO |
995 | /* Unlink from connecting and link to the client array */ |
996 | nfc_llcp_sock_unlink(&local->connecting_sockets, sk); | |
997 | nfc_llcp_sock_link(&local->sockets, sk); | |
998 | llcp_sock->dsap = ssap; | |
999 | ||
7a06e586 SO |
1000 | nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE], |
1001 | skb->len - LLCP_HEADER_SIZE); | |
d646960f | 1002 | |
ff353d86 SO |
1003 | sk->sk_state = LLCP_CONNECTED; |
1004 | sk->sk_state_change(sk); | |
1005 | ||
d646960f SO |
1006 | nfc_llcp_sock_put(llcp_sock); |
1007 | } | |
1008 | ||
5c0560b7 SO |
1009 | static void nfc_llcp_recv_dm(struct nfc_llcp_local *local, struct sk_buff *skb) |
1010 | { | |
1011 | struct nfc_llcp_sock *llcp_sock; | |
1012 | struct sock *sk; | |
1013 | u8 dsap, ssap, reason; | |
1014 | ||
1015 | dsap = nfc_llcp_dsap(skb); | |
1016 | ssap = nfc_llcp_ssap(skb); | |
1017 | reason = skb->data[2]; | |
1018 | ||
1019 | pr_debug("%d %d reason %d\n", ssap, dsap, reason); | |
1020 | ||
1021 | switch (reason) { | |
1022 | case LLCP_DM_NOBOUND: | |
1023 | case LLCP_DM_REJ: | |
1024 | llcp_sock = nfc_llcp_connecting_sock_get(local, dsap); | |
1025 | break; | |
1026 | ||
1027 | default: | |
1028 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
1029 | break; | |
1030 | } | |
1031 | ||
1032 | if (llcp_sock == NULL) { | |
1033 | pr_err("Invalid DM\n"); | |
1034 | return; | |
1035 | } | |
1036 | ||
1037 | sk = &llcp_sock->sk; | |
1038 | ||
1039 | sk->sk_err = ENXIO; | |
1040 | sk->sk_state = LLCP_CLOSED; | |
1041 | sk->sk_state_change(sk); | |
1042 | ||
1043 | nfc_llcp_sock_put(llcp_sock); | |
5c0560b7 SO |
1044 | } |
1045 | ||
19cfe584 SO |
1046 | static void nfc_llcp_recv_snl(struct nfc_llcp_local *local, |
1047 | struct sk_buff *skb) | |
1048 | { | |
1049 | struct nfc_llcp_sock *llcp_sock; | |
1050 | u8 dsap, ssap, *tlv, type, length, tid, sap; | |
1051 | u16 tlv_len, offset; | |
1052 | char *service_name; | |
1053 | size_t service_name_len; | |
1054 | ||
1055 | dsap = nfc_llcp_dsap(skb); | |
1056 | ssap = nfc_llcp_ssap(skb); | |
1057 | ||
1058 | pr_debug("%d %d\n", dsap, ssap); | |
1059 | ||
1060 | if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) { | |
1061 | pr_err("Wrong SNL SAP\n"); | |
1062 | return; | |
1063 | } | |
1064 | ||
1065 | tlv = &skb->data[LLCP_HEADER_SIZE]; | |
1066 | tlv_len = skb->len - LLCP_HEADER_SIZE; | |
1067 | offset = 0; | |
1068 | ||
1069 | while(offset < tlv_len) { | |
1070 | type = tlv[0]; | |
1071 | length = tlv[1]; | |
1072 | ||
1073 | switch (type) { | |
1074 | case LLCP_TLV_SDREQ: | |
1075 | tid = tlv[2]; | |
1076 | service_name = (char *) &tlv[3]; | |
1077 | service_name_len = length - 1; | |
1078 | ||
e6904081 | 1079 | pr_debug("Looking for %.16s\n", service_name); |
19cfe584 SO |
1080 | |
1081 | if (service_name_len == strlen("urn:nfc:sn:sdp") && | |
1082 | !strncmp(service_name, "urn:nfc:sn:sdp", | |
1083 | service_name_len)) { | |
1084 | sap = 1; | |
e6904081 SO |
1085 | goto send_snl; |
1086 | } | |
1087 | ||
1088 | llcp_sock = nfc_llcp_sock_from_sn(local, service_name, | |
1089 | service_name_len); | |
1090 | if (!llcp_sock) { | |
1091 | sap = 0; | |
1092 | goto send_snl; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * We found a socket but its ssap has not been reserved | |
1097 | * yet. We need to assign it for good and send a reply. | |
1098 | * The ssap will be freed when the socket is closed. | |
1099 | */ | |
1100 | if (llcp_sock->ssap == LLCP_SDP_UNBOUND) { | |
1101 | atomic_t *client_count; | |
1102 | ||
1103 | sap = nfc_llcp_reserve_sdp_ssap(local); | |
1104 | ||
1105 | pr_debug("Reserving %d\n", sap); | |
1106 | ||
1107 | if (sap == LLCP_SAP_MAX) { | |
1108 | sap = 0; | |
1109 | goto send_snl; | |
1110 | } | |
1111 | ||
1112 | client_count = | |
1113 | &local->local_sdp_cnt[sap - | |
1114 | LLCP_WKS_NUM_SAP]; | |
1115 | ||
1116 | atomic_inc(client_count); | |
1117 | ||
1118 | llcp_sock->ssap = sap; | |
1119 | llcp_sock->reserved_ssap = sap; | |
19cfe584 | 1120 | } else { |
e6904081 | 1121 | sap = llcp_sock->ssap; |
19cfe584 SO |
1122 | } |
1123 | ||
e6904081 SO |
1124 | pr_debug("%p %d\n", llcp_sock, sap); |
1125 | ||
1126 | send_snl: | |
19cfe584 SO |
1127 | nfc_llcp_send_snl(local, tid, sap); |
1128 | break; | |
1129 | ||
1130 | default: | |
1131 | pr_err("Invalid SNL tlv value 0x%x\n", type); | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | offset += length + 2; | |
1136 | tlv += length + 2; | |
1137 | } | |
1138 | } | |
1139 | ||
d646960f SO |
1140 | static void nfc_llcp_rx_work(struct work_struct *work) |
1141 | { | |
1142 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 1143 | rx_work); |
d646960f SO |
1144 | u8 dsap, ssap, ptype; |
1145 | struct sk_buff *skb; | |
1146 | ||
1147 | skb = local->rx_pending; | |
1148 | if (skb == NULL) { | |
1149 | pr_debug("No pending SKB\n"); | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | ptype = nfc_llcp_ptype(skb); | |
1154 | dsap = nfc_llcp_dsap(skb); | |
1155 | ssap = nfc_llcp_ssap(skb); | |
1156 | ||
1157 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
1158 | ||
4be646ec SO |
1159 | if (ptype != LLCP_PDU_SYMM) |
1160 | print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, | |
1161 | 16, 1, skb->data, skb->len, true); | |
1162 | ||
4463523b TE |
1163 | nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_RX); |
1164 | ||
d646960f SO |
1165 | switch (ptype) { |
1166 | case LLCP_PDU_SYMM: | |
1167 | pr_debug("SYMM\n"); | |
1168 | break; | |
1169 | ||
1170 | case LLCP_PDU_CONNECT: | |
1171 | pr_debug("CONNECT\n"); | |
1172 | nfc_llcp_recv_connect(local, skb); | |
1173 | break; | |
1174 | ||
1175 | case LLCP_PDU_DISC: | |
1176 | pr_debug("DISC\n"); | |
1177 | nfc_llcp_recv_disc(local, skb); | |
1178 | break; | |
1179 | ||
1180 | case LLCP_PDU_CC: | |
1181 | pr_debug("CC\n"); | |
1182 | nfc_llcp_recv_cc(local, skb); | |
1183 | break; | |
1184 | ||
5c0560b7 SO |
1185 | case LLCP_PDU_DM: |
1186 | pr_debug("DM\n"); | |
1187 | nfc_llcp_recv_dm(local, skb); | |
1188 | break; | |
1189 | ||
19cfe584 SO |
1190 | case LLCP_PDU_SNL: |
1191 | pr_debug("SNL\n"); | |
1192 | nfc_llcp_recv_snl(local, skb); | |
1193 | break; | |
1194 | ||
d646960f SO |
1195 | case LLCP_PDU_I: |
1196 | case LLCP_PDU_RR: | |
53aef920 | 1197 | case LLCP_PDU_RNR: |
d646960f SO |
1198 | pr_debug("I frame\n"); |
1199 | nfc_llcp_recv_hdlc(local, skb); | |
1200 | break; | |
1201 | ||
1202 | } | |
1203 | ||
916082b0 | 1204 | schedule_work(&local->tx_work); |
d646960f SO |
1205 | kfree_skb(local->rx_pending); |
1206 | local->rx_pending = NULL; | |
d646960f SO |
1207 | } |
1208 | ||
1209 | void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) | |
1210 | { | |
1211 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
1212 | ||
1213 | pr_debug("Received an LLCP PDU\n"); | |
1214 | if (err < 0) { | |
427a2eb1 | 1215 | pr_err("err %d\n", err); |
d646960f SO |
1216 | return; |
1217 | } | |
1218 | ||
1219 | local->rx_pending = skb_get(skb); | |
1220 | del_timer(&local->link_timer); | |
916082b0 | 1221 | schedule_work(&local->rx_work); |
d646960f SO |
1222 | } |
1223 | ||
73167ced SO |
1224 | int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb) |
1225 | { | |
1226 | struct nfc_llcp_local *local; | |
1227 | ||
1228 | local = nfc_llcp_find_local(dev); | |
1229 | if (local == NULL) | |
1230 | return -ENODEV; | |
1231 | ||
1232 | local->rx_pending = skb_get(skb); | |
1233 | del_timer(&local->link_timer); | |
916082b0 | 1234 | schedule_work(&local->rx_work); |
73167ced SO |
1235 | |
1236 | return 0; | |
1237 | } | |
1238 | ||
d646960f SO |
1239 | void nfc_llcp_mac_is_down(struct nfc_dev *dev) |
1240 | { | |
1241 | struct nfc_llcp_local *local; | |
1242 | ||
1243 | local = nfc_llcp_find_local(dev); | |
1244 | if (local == NULL) | |
1245 | return; | |
1246 | ||
1247 | /* Close and purge all existing sockets */ | |
4d22ea15 | 1248 | nfc_llcp_socket_release(local, true); |
d646960f SO |
1249 | } |
1250 | ||
1251 | void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, | |
1252 | u8 comm_mode, u8 rf_mode) | |
1253 | { | |
1254 | struct nfc_llcp_local *local; | |
1255 | ||
1256 | pr_debug("rf mode %d\n", rf_mode); | |
1257 | ||
1258 | local = nfc_llcp_find_local(dev); | |
1259 | if (local == NULL) | |
1260 | return; | |
1261 | ||
1262 | local->target_idx = target_idx; | |
1263 | local->comm_mode = comm_mode; | |
1264 | local->rf_mode = rf_mode; | |
1265 | ||
1266 | if (rf_mode == NFC_RF_INITIATOR) { | |
1267 | pr_debug("Queueing Tx work\n"); | |
1268 | ||
916082b0 | 1269 | schedule_work(&local->tx_work); |
d646960f SO |
1270 | } else { |
1271 | mod_timer(&local->link_timer, | |
427a2eb1 | 1272 | jiffies + msecs_to_jiffies(local->remote_lto)); |
d646960f SO |
1273 | } |
1274 | } | |
1275 | ||
1276 | int nfc_llcp_register_device(struct nfc_dev *ndev) | |
1277 | { | |
d646960f | 1278 | struct nfc_llcp_local *local; |
d646960f SO |
1279 | |
1280 | local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); | |
1281 | if (local == NULL) | |
1282 | return -ENOMEM; | |
1283 | ||
1284 | local->dev = ndev; | |
1285 | INIT_LIST_HEAD(&local->list); | |
c7aa1225 | 1286 | kref_init(&local->ref); |
d646960f | 1287 | mutex_init(&local->sdp_lock); |
d646960f SO |
1288 | init_timer(&local->link_timer); |
1289 | local->link_timer.data = (unsigned long) local; | |
1290 | local->link_timer.function = nfc_llcp_symm_timer; | |
1291 | ||
1292 | skb_queue_head_init(&local->tx_queue); | |
1293 | INIT_WORK(&local->tx_work, nfc_llcp_tx_work); | |
d646960f SO |
1294 | |
1295 | local->rx_pending = NULL; | |
1296 | INIT_WORK(&local->rx_work, nfc_llcp_rx_work); | |
d646960f SO |
1297 | |
1298 | INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); | |
d646960f | 1299 | |
fe235b58 SJ |
1300 | rwlock_init(&local->sockets.lock); |
1301 | rwlock_init(&local->connecting_sockets.lock); | |
4463523b | 1302 | rwlock_init(&local->raw_sockets.lock); |
a69f32af | 1303 | |
d646960f SO |
1304 | nfc_llcp_build_gb(local); |
1305 | ||
1306 | local->remote_miu = LLCP_DEFAULT_MIU; | |
1307 | local->remote_lto = LLCP_DEFAULT_LTO; | |
d646960f SO |
1308 | |
1309 | list_add(&llcp_devices, &local->list); | |
1310 | ||
d646960f SO |
1311 | return 0; |
1312 | } | |
1313 | ||
1314 | void nfc_llcp_unregister_device(struct nfc_dev *dev) | |
1315 | { | |
1316 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
1317 | ||
1318 | if (local == NULL) { | |
1319 | pr_debug("No such device\n"); | |
1320 | return; | |
1321 | } | |
1322 | ||
c7aa1225 | 1323 | nfc_llcp_local_put(local); |
d646960f SO |
1324 | } |
1325 | ||
1326 | int __init nfc_llcp_init(void) | |
1327 | { | |
1328 | INIT_LIST_HEAD(&llcp_devices); | |
1329 | ||
1330 | return nfc_llcp_sock_init(); | |
1331 | } | |
1332 | ||
1333 | void nfc_llcp_exit(void) | |
1334 | { | |
1335 | nfc_llcp_sock_exit(); | |
1336 | } |