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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 | ||
34 | static void nfc_llcp_socket_release(struct nfc_llcp_local *local) | |
35 | { | |
36 | struct nfc_llcp_sock *parent, *s, *n; | |
37 | struct sock *sk, *parent_sk; | |
38 | int i; | |
39 | ||
40 | ||
41 | mutex_lock(&local->socket_lock); | |
42 | ||
43 | for (i = 0; i < LLCP_MAX_SAP; i++) { | |
44 | parent = local->sockets[i]; | |
45 | if (parent == NULL) | |
46 | continue; | |
47 | ||
48 | /* Release all child sockets */ | |
49 | list_for_each_entry_safe(s, n, &parent->list, list) { | |
40c75f81 | 50 | list_del_init(&s->list); |
d646960f SO |
51 | sk = &s->sk; |
52 | ||
53 | lock_sock(sk); | |
54 | ||
55 | if (sk->sk_state == LLCP_CONNECTED) | |
56 | nfc_put_device(s->dev); | |
57 | ||
58 | sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
59 | |
60 | release_sock(sk); | |
40c75f81 SO |
61 | |
62 | sock_orphan(sk); | |
63 | ||
64 | s->local = NULL; | |
d646960f SO |
65 | } |
66 | ||
67 | parent_sk = &parent->sk; | |
68 | ||
69 | lock_sock(parent_sk); | |
70 | ||
71 | if (parent_sk->sk_state == LLCP_LISTEN) { | |
72 | struct nfc_llcp_sock *lsk, *n; | |
73 | struct sock *accept_sk; | |
74 | ||
75 | list_for_each_entry_safe(lsk, n, &parent->accept_queue, | |
76 | accept_queue) { | |
77 | accept_sk = &lsk->sk; | |
78 | lock_sock(accept_sk); | |
79 | ||
80 | nfc_llcp_accept_unlink(accept_sk); | |
81 | ||
82 | accept_sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
83 | |
84 | release_sock(accept_sk); | |
85 | ||
86 | sock_orphan(accept_sk); | |
40c75f81 SO |
87 | |
88 | lsk->local = NULL; | |
d646960f SO |
89 | } |
90 | } | |
91 | ||
92 | if (parent_sk->sk_state == LLCP_CONNECTED) | |
93 | nfc_put_device(parent->dev); | |
94 | ||
95 | parent_sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
96 | |
97 | release_sock(parent_sk); | |
40c75f81 SO |
98 | |
99 | sock_orphan(parent_sk); | |
100 | ||
101 | parent->local = NULL; | |
d646960f SO |
102 | } |
103 | ||
104 | mutex_unlock(&local->socket_lock); | |
105 | } | |
106 | ||
b9a76f1d SO |
107 | static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local) |
108 | { | |
109 | mutex_lock(&local->sdp_lock); | |
110 | ||
111 | local->local_wks = 0; | |
112 | local->local_sdp = 0; | |
113 | local->local_sap = 0; | |
114 | ||
115 | mutex_unlock(&local->sdp_lock); | |
116 | } | |
117 | ||
d646960f SO |
118 | static void nfc_llcp_timeout_work(struct work_struct *work) |
119 | { | |
120 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
121 | timeout_work); | |
122 | ||
123 | nfc_dep_link_down(local->dev); | |
124 | } | |
125 | ||
126 | static void nfc_llcp_symm_timer(unsigned long data) | |
127 | { | |
128 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
129 | ||
130 | pr_err("SYMM timeout\n"); | |
131 | ||
132 | queue_work(local->timeout_wq, &local->timeout_work); | |
133 | } | |
134 | ||
135 | struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) | |
136 | { | |
137 | struct nfc_llcp_local *local, *n; | |
138 | ||
139 | list_for_each_entry_safe(local, n, &llcp_devices, list) | |
140 | if (local->dev == dev) | |
141 | return local; | |
142 | ||
143 | pr_debug("No device found\n"); | |
144 | ||
145 | return NULL; | |
146 | } | |
147 | ||
148 | static char *wks[] = { | |
149 | NULL, | |
150 | NULL, /* SDP */ | |
151 | "urn:nfc:sn:ip", | |
152 | "urn:nfc:sn:obex", | |
153 | "urn:nfc:sn:snep", | |
154 | }; | |
155 | ||
156 | static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) | |
157 | { | |
158 | int sap, num_wks; | |
159 | ||
160 | pr_debug("%s\n", service_name); | |
161 | ||
162 | if (service_name == NULL) | |
163 | return -EINVAL; | |
164 | ||
165 | num_wks = ARRAY_SIZE(wks); | |
166 | ||
167 | for (sap = 0 ; sap < num_wks; sap++) { | |
168 | if (wks[sap] == NULL) | |
169 | continue; | |
170 | ||
171 | if (strncmp(wks[sap], service_name, service_name_len) == 0) | |
172 | return sap; | |
173 | } | |
174 | ||
175 | return -EINVAL; | |
176 | } | |
177 | ||
178 | u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, | |
179 | struct nfc_llcp_sock *sock) | |
180 | { | |
181 | mutex_lock(&local->sdp_lock); | |
182 | ||
183 | if (sock->service_name != NULL && sock->service_name_len > 0) { | |
184 | int ssap = nfc_llcp_wks_sap(sock->service_name, | |
185 | sock->service_name_len); | |
186 | ||
187 | if (ssap > 0) { | |
188 | pr_debug("WKS %d\n", ssap); | |
189 | ||
190 | /* This is a WKS, let's check if it's free */ | |
191 | if (local->local_wks & BIT(ssap)) { | |
192 | mutex_unlock(&local->sdp_lock); | |
193 | ||
194 | return LLCP_SAP_MAX; | |
195 | } | |
196 | ||
1762c17c | 197 | set_bit(ssap, &local->local_wks); |
d646960f SO |
198 | mutex_unlock(&local->sdp_lock); |
199 | ||
200 | return ssap; | |
201 | } | |
202 | ||
203 | /* | |
204 | * This is not a well known service, | |
205 | * we should try to find a local SDP free spot | |
206 | */ | |
207 | ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); | |
208 | if (ssap == LLCP_SDP_NUM_SAP) { | |
209 | mutex_unlock(&local->sdp_lock); | |
210 | ||
211 | return LLCP_SAP_MAX; | |
212 | } | |
213 | ||
214 | pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); | |
215 | ||
1762c17c | 216 | set_bit(ssap, &local->local_sdp); |
d646960f SO |
217 | mutex_unlock(&local->sdp_lock); |
218 | ||
219 | return LLCP_WKS_NUM_SAP + ssap; | |
220 | ||
221 | } else if (sock->ssap != 0) { | |
222 | if (sock->ssap < LLCP_WKS_NUM_SAP) { | |
1762c17c SO |
223 | if (!test_bit(sock->ssap, &local->local_wks)) { |
224 | set_bit(sock->ssap, &local->local_wks); | |
d646960f SO |
225 | mutex_unlock(&local->sdp_lock); |
226 | ||
227 | return sock->ssap; | |
228 | } | |
229 | ||
230 | } else if (sock->ssap < LLCP_SDP_NUM_SAP) { | |
1762c17c SO |
231 | if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP, |
232 | &local->local_sdp)) { | |
233 | set_bit(sock->ssap - LLCP_WKS_NUM_SAP, | |
234 | &local->local_sdp); | |
d646960f SO |
235 | mutex_unlock(&local->sdp_lock); |
236 | ||
237 | return sock->ssap; | |
238 | } | |
239 | } | |
240 | } | |
241 | ||
242 | mutex_unlock(&local->sdp_lock); | |
243 | ||
244 | return LLCP_SAP_MAX; | |
245 | } | |
246 | ||
247 | u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) | |
248 | { | |
249 | u8 local_ssap; | |
250 | ||
251 | mutex_lock(&local->sdp_lock); | |
252 | ||
253 | local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); | |
254 | if (local_ssap == LLCP_LOCAL_NUM_SAP) { | |
255 | mutex_unlock(&local->sdp_lock); | |
256 | return LLCP_SAP_MAX; | |
257 | } | |
258 | ||
1762c17c | 259 | set_bit(local_ssap, &local->local_sap); |
d646960f SO |
260 | |
261 | mutex_unlock(&local->sdp_lock); | |
262 | ||
263 | return local_ssap + LLCP_LOCAL_SAP_OFFSET; | |
264 | } | |
265 | ||
266 | void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) | |
267 | { | |
268 | u8 local_ssap; | |
269 | unsigned long *sdp; | |
270 | ||
271 | if (ssap < LLCP_WKS_NUM_SAP) { | |
272 | local_ssap = ssap; | |
273 | sdp = &local->local_wks; | |
274 | } else if (ssap < LLCP_LOCAL_NUM_SAP) { | |
275 | local_ssap = ssap - LLCP_WKS_NUM_SAP; | |
276 | sdp = &local->local_sdp; | |
277 | } else if (ssap < LLCP_MAX_SAP) { | |
278 | local_ssap = ssap - LLCP_LOCAL_NUM_SAP; | |
279 | sdp = &local->local_sap; | |
280 | } else { | |
281 | return; | |
282 | } | |
283 | ||
284 | mutex_lock(&local->sdp_lock); | |
285 | ||
1762c17c | 286 | clear_bit(local_ssap, sdp); |
d646960f SO |
287 | |
288 | mutex_unlock(&local->sdp_lock); | |
289 | } | |
290 | ||
47807d3d | 291 | u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) |
d646960f SO |
292 | { |
293 | struct nfc_llcp_local *local; | |
294 | ||
295 | local = nfc_llcp_find_local(dev); | |
296 | if (local == NULL) { | |
297 | *general_bytes_len = 0; | |
298 | return NULL; | |
299 | } | |
300 | ||
301 | *general_bytes_len = local->gb_len; | |
302 | ||
303 | return local->gb; | |
304 | } | |
305 | ||
306 | static int nfc_llcp_build_gb(struct nfc_llcp_local *local) | |
307 | { | |
308 | u8 *gb_cur, *version_tlv, version, version_length; | |
309 | u8 *lto_tlv, lto, lto_length; | |
310 | u8 *wks_tlv, wks_length; | |
311 | u8 gb_len = 0; | |
312 | ||
313 | version = LLCP_VERSION_11; | |
314 | version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, | |
315 | 1, &version_length); | |
316 | gb_len += version_length; | |
317 | ||
318 | /* 1500 ms */ | |
319 | lto = 150; | |
320 | lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, <o, 1, <o_length); | |
321 | gb_len += lto_length; | |
322 | ||
323 | pr_debug("Local wks 0x%lx\n", local->local_wks); | |
324 | wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, | |
325 | &wks_length); | |
326 | gb_len += wks_length; | |
327 | ||
328 | gb_len += ARRAY_SIZE(llcp_magic); | |
329 | ||
330 | if (gb_len > NFC_MAX_GT_LEN) { | |
331 | kfree(version_tlv); | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
335 | gb_cur = local->gb; | |
336 | ||
337 | memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); | |
338 | gb_cur += ARRAY_SIZE(llcp_magic); | |
339 | ||
340 | memcpy(gb_cur, version_tlv, version_length); | |
341 | gb_cur += version_length; | |
342 | ||
343 | memcpy(gb_cur, lto_tlv, lto_length); | |
344 | gb_cur += lto_length; | |
345 | ||
346 | memcpy(gb_cur, wks_tlv, wks_length); | |
347 | gb_cur += wks_length; | |
348 | ||
349 | kfree(version_tlv); | |
350 | kfree(lto_tlv); | |
351 | ||
352 | local->gb_len = gb_len; | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) | |
358 | { | |
359 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
360 | ||
361 | if (local == NULL) { | |
362 | pr_err("No LLCP device\n"); | |
363 | return -ENODEV; | |
364 | } | |
365 | ||
366 | memset(local->remote_gb, 0, NFC_MAX_GT_LEN); | |
367 | memcpy(local->remote_gb, gb, gb_len); | |
368 | local->remote_gb_len = gb_len; | |
369 | ||
370 | if (local->remote_gb == NULL || | |
371 | local->remote_gb_len == 0) | |
372 | return -ENODEV; | |
373 | ||
374 | if (memcmp(local->remote_gb, llcp_magic, 3)) { | |
375 | pr_err("MAC does not support LLCP\n"); | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | return nfc_llcp_parse_tlv(local, | |
380 | &local->remote_gb[3], local->remote_gb_len - 3); | |
381 | } | |
382 | ||
383 | static void nfc_llcp_tx_work(struct work_struct *work) | |
384 | { | |
385 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
386 | tx_work); | |
387 | struct sk_buff *skb; | |
388 | ||
389 | skb = skb_dequeue(&local->tx_queue); | |
390 | if (skb != NULL) { | |
391 | pr_debug("Sending pending skb\n"); | |
392 | nfc_data_exchange(local->dev, local->target_idx, | |
393 | skb, nfc_llcp_recv, local); | |
394 | } else { | |
395 | nfc_llcp_send_symm(local->dev); | |
396 | } | |
397 | ||
398 | mod_timer(&local->link_timer, | |
399 | jiffies + msecs_to_jiffies(local->remote_lto)); | |
400 | } | |
401 | ||
402 | static u8 nfc_llcp_dsap(struct sk_buff *pdu) | |
403 | { | |
404 | return (pdu->data[0] & 0xfc) >> 2; | |
405 | } | |
406 | ||
407 | static u8 nfc_llcp_ptype(struct sk_buff *pdu) | |
408 | { | |
409 | return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); | |
410 | } | |
411 | ||
412 | static u8 nfc_llcp_ssap(struct sk_buff *pdu) | |
413 | { | |
414 | return pdu->data[1] & 0x3f; | |
415 | } | |
416 | ||
417 | static u8 nfc_llcp_ns(struct sk_buff *pdu) | |
418 | { | |
419 | return pdu->data[2] >> 4; | |
420 | } | |
421 | ||
422 | static u8 nfc_llcp_nr(struct sk_buff *pdu) | |
423 | { | |
424 | return pdu->data[2] & 0xf; | |
425 | } | |
426 | ||
427 | static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) | |
428 | { | |
0767a7fa | 429 | pdu->data[2] = (sock->send_n << 4) | (sock->recv_n % 16); |
d646960f SO |
430 | sock->send_n = (sock->send_n + 1) % 16; |
431 | sock->recv_ack_n = (sock->recv_n - 1) % 16; | |
432 | } | |
433 | ||
434 | static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, | |
435 | u8 ssap, u8 dsap) | |
436 | { | |
437 | struct nfc_llcp_sock *sock, *llcp_sock, *n; | |
438 | ||
439 | if (ssap == 0 && dsap == 0) | |
440 | return NULL; | |
441 | ||
442 | mutex_lock(&local->socket_lock); | |
443 | sock = local->sockets[ssap]; | |
444 | if (sock == NULL) { | |
445 | mutex_unlock(&local->socket_lock); | |
446 | return NULL; | |
447 | } | |
448 | ||
449 | pr_debug("root dsap %d (%d)\n", sock->dsap, dsap); | |
450 | ||
451 | if (sock->dsap == dsap) { | |
452 | sock_hold(&sock->sk); | |
453 | mutex_unlock(&local->socket_lock); | |
454 | return sock; | |
455 | } | |
456 | ||
457 | list_for_each_entry_safe(llcp_sock, n, &sock->list, list) { | |
458 | pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock, | |
459 | &llcp_sock->sk, llcp_sock->dsap); | |
460 | if (llcp_sock->dsap == dsap) { | |
461 | sock_hold(&llcp_sock->sk); | |
462 | mutex_unlock(&local->socket_lock); | |
463 | return llcp_sock; | |
464 | } | |
465 | } | |
466 | ||
467 | pr_err("Could not find socket for %d %d\n", ssap, dsap); | |
468 | ||
469 | mutex_unlock(&local->socket_lock); | |
470 | ||
471 | return NULL; | |
472 | } | |
473 | ||
474 | static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) | |
475 | { | |
476 | sock_put(&sock->sk); | |
477 | } | |
478 | ||
479 | static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) | |
480 | { | |
481 | u8 *tlv = &skb->data[2], type, length; | |
482 | size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; | |
483 | ||
484 | while (offset < tlv_array_len) { | |
485 | type = tlv[0]; | |
486 | length = tlv[1]; | |
487 | ||
488 | pr_debug("type 0x%x length %d\n", type, length); | |
489 | ||
490 | if (type == LLCP_TLV_SN) { | |
491 | *sn_len = length; | |
492 | return &tlv[2]; | |
493 | } | |
494 | ||
495 | offset += length + 2; | |
496 | tlv += length + 2; | |
497 | } | |
498 | ||
499 | return NULL; | |
500 | } | |
501 | ||
502 | static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, | |
503 | struct sk_buff *skb) | |
504 | { | |
505 | struct sock *new_sk, *parent; | |
506 | struct nfc_llcp_sock *sock, *new_sock; | |
507 | u8 dsap, ssap, bound_sap, reason; | |
508 | ||
509 | dsap = nfc_llcp_dsap(skb); | |
510 | ssap = nfc_llcp_ssap(skb); | |
511 | ||
512 | pr_debug("%d %d\n", dsap, ssap); | |
513 | ||
514 | nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE], | |
515 | skb->len - LLCP_HEADER_SIZE); | |
516 | ||
517 | if (dsap != LLCP_SAP_SDP) { | |
518 | bound_sap = dsap; | |
519 | ||
520 | mutex_lock(&local->socket_lock); | |
521 | sock = local->sockets[dsap]; | |
522 | if (sock == NULL) { | |
523 | mutex_unlock(&local->socket_lock); | |
524 | reason = LLCP_DM_NOBOUND; | |
525 | goto fail; | |
526 | } | |
527 | ||
528 | sock_hold(&sock->sk); | |
529 | mutex_unlock(&local->socket_lock); | |
530 | ||
531 | lock_sock(&sock->sk); | |
532 | ||
533 | if (sock->dsap == LLCP_SAP_SDP && | |
534 | sock->sk.sk_state == LLCP_LISTEN) | |
535 | goto enqueue; | |
536 | } else { | |
537 | u8 *sn; | |
538 | size_t sn_len; | |
539 | ||
540 | sn = nfc_llcp_connect_sn(skb, &sn_len); | |
541 | if (sn == NULL) { | |
542 | reason = LLCP_DM_NOBOUND; | |
543 | goto fail; | |
544 | } | |
545 | ||
546 | pr_debug("Service name length %zu\n", sn_len); | |
547 | ||
548 | mutex_lock(&local->socket_lock); | |
549 | for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET; | |
550 | bound_sap++) { | |
551 | sock = local->sockets[bound_sap]; | |
552 | if (sock == NULL) | |
553 | continue; | |
554 | ||
555 | if (sock->service_name == NULL || | |
556 | sock->service_name_len == 0) | |
557 | continue; | |
558 | ||
559 | if (sock->service_name_len != sn_len) | |
560 | continue; | |
561 | ||
562 | if (sock->dsap == LLCP_SAP_SDP && | |
563 | sock->sk.sk_state == LLCP_LISTEN && | |
564 | !memcmp(sn, sock->service_name, sn_len)) { | |
565 | pr_debug("Found service name at SAP %d\n", | |
566 | bound_sap); | |
567 | sock_hold(&sock->sk); | |
568 | mutex_unlock(&local->socket_lock); | |
569 | ||
570 | lock_sock(&sock->sk); | |
571 | ||
572 | goto enqueue; | |
573 | } | |
574 | } | |
341ee434 | 575 | mutex_unlock(&local->socket_lock); |
d646960f SO |
576 | } |
577 | ||
d646960f SO |
578 | reason = LLCP_DM_NOBOUND; |
579 | goto fail; | |
580 | ||
581 | enqueue: | |
582 | parent = &sock->sk; | |
583 | ||
584 | if (sk_acceptq_is_full(parent)) { | |
585 | reason = LLCP_DM_REJ; | |
586 | release_sock(&sock->sk); | |
587 | sock_put(&sock->sk); | |
588 | goto fail; | |
589 | } | |
590 | ||
591 | new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, | |
592 | GFP_ATOMIC); | |
593 | if (new_sk == NULL) { | |
594 | reason = LLCP_DM_REJ; | |
595 | release_sock(&sock->sk); | |
596 | sock_put(&sock->sk); | |
597 | goto fail; | |
598 | } | |
599 | ||
600 | new_sock = nfc_llcp_sock(new_sk); | |
601 | new_sock->dev = local->dev; | |
602 | new_sock->local = local; | |
603 | new_sock->nfc_protocol = sock->nfc_protocol; | |
604 | new_sock->ssap = bound_sap; | |
605 | new_sock->dsap = ssap; | |
606 | new_sock->parent = parent; | |
607 | ||
608 | pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); | |
609 | ||
610 | list_add_tail(&new_sock->list, &sock->list); | |
611 | ||
612 | nfc_llcp_accept_enqueue(&sock->sk, new_sk); | |
613 | ||
614 | nfc_get_device(local->dev->idx); | |
615 | ||
616 | new_sk->sk_state = LLCP_CONNECTED; | |
617 | ||
618 | /* Wake the listening processes */ | |
619 | parent->sk_data_ready(parent, 0); | |
620 | ||
621 | /* Send CC */ | |
622 | nfc_llcp_send_cc(new_sock); | |
623 | ||
624 | release_sock(&sock->sk); | |
625 | sock_put(&sock->sk); | |
626 | ||
627 | return; | |
628 | ||
629 | fail: | |
630 | /* Send DM */ | |
631 | nfc_llcp_send_dm(local, dsap, ssap, reason); | |
632 | ||
633 | return; | |
634 | ||
635 | } | |
636 | ||
d094afa1 | 637 | int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) |
4722d2b7 | 638 | { |
d094afa1 | 639 | int nr_frames = 0; |
4722d2b7 SO |
640 | struct nfc_llcp_local *local = sock->local; |
641 | ||
642 | pr_debug("Remote ready %d tx queue len %d remote rw %d", | |
643 | sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), | |
644 | local->remote_rw); | |
645 | ||
646 | /* Try to queue some I frames for transmission */ | |
647 | while (sock->remote_ready && | |
648 | skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) { | |
649 | struct sk_buff *pdu, *pending_pdu; | |
650 | ||
651 | pdu = skb_dequeue(&sock->tx_queue); | |
652 | if (pdu == NULL) | |
653 | break; | |
654 | ||
655 | /* Update N(S)/N(R) */ | |
656 | nfc_llcp_set_nrns(sock, pdu); | |
657 | ||
658 | pending_pdu = skb_clone(pdu, GFP_KERNEL); | |
659 | ||
660 | skb_queue_tail(&local->tx_queue, pdu); | |
661 | skb_queue_tail(&sock->tx_pending_queue, pending_pdu); | |
d094afa1 | 662 | nr_frames++; |
4722d2b7 | 663 | } |
d094afa1 SO |
664 | |
665 | return nr_frames; | |
4722d2b7 SO |
666 | } |
667 | ||
d646960f SO |
668 | static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, |
669 | struct sk_buff *skb) | |
670 | { | |
671 | struct nfc_llcp_sock *llcp_sock; | |
672 | struct sock *sk; | |
673 | u8 dsap, ssap, ptype, ns, nr; | |
674 | ||
675 | ptype = nfc_llcp_ptype(skb); | |
676 | dsap = nfc_llcp_dsap(skb); | |
677 | ssap = nfc_llcp_ssap(skb); | |
678 | ns = nfc_llcp_ns(skb); | |
679 | nr = nfc_llcp_nr(skb); | |
680 | ||
681 | pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); | |
682 | ||
683 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
684 | if (llcp_sock == NULL) { | |
685 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
686 | return; | |
687 | } | |
688 | ||
689 | sk = &llcp_sock->sk; | |
690 | lock_sock(sk); | |
691 | if (sk->sk_state == LLCP_CLOSED) { | |
692 | release_sock(sk); | |
693 | nfc_llcp_sock_put(llcp_sock); | |
694 | } | |
695 | ||
d646960f SO |
696 | /* Pass the payload upstream */ |
697 | if (ptype == LLCP_PDU_I) { | |
698 | pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); | |
699 | ||
53aef920 SO |
700 | if (ns == llcp_sock->recv_n) |
701 | llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; | |
702 | else | |
703 | pr_err("Received out of sequence I PDU\n"); | |
704 | ||
d646960f SO |
705 | skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
706 | if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) { | |
707 | pr_err("receive queue is full\n"); | |
708 | skb_queue_head(&llcp_sock->tx_backlog_queue, skb); | |
709 | } | |
710 | } | |
711 | ||
712 | /* Remove skbs from the pending queue */ | |
713 | if (llcp_sock->send_ack_n != nr) { | |
714 | struct sk_buff *s, *tmp; | |
715 | ||
716 | llcp_sock->send_ack_n = nr; | |
717 | ||
718 | skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) | |
719 | if (nfc_llcp_ns(s) <= nr) { | |
720 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
721 | kfree_skb(s); | |
722 | } | |
723 | } | |
724 | ||
53aef920 SO |
725 | if (ptype == LLCP_PDU_RR) |
726 | llcp_sock->remote_ready = true; | |
727 | else if (ptype == LLCP_PDU_RNR) | |
728 | llcp_sock->remote_ready = false; | |
729 | ||
d094afa1 SO |
730 | if (nfc_llcp_queue_i_frames(llcp_sock) == 0) |
731 | nfc_llcp_send_rr(llcp_sock); | |
d646960f SO |
732 | |
733 | release_sock(sk); | |
734 | nfc_llcp_sock_put(llcp_sock); | |
735 | } | |
736 | ||
737 | static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, | |
738 | struct sk_buff *skb) | |
739 | { | |
740 | struct nfc_llcp_sock *llcp_sock; | |
741 | struct sock *sk; | |
742 | u8 dsap, ssap; | |
743 | ||
744 | dsap = nfc_llcp_dsap(skb); | |
745 | ssap = nfc_llcp_ssap(skb); | |
746 | ||
747 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
748 | if (llcp_sock == NULL) { | |
749 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
750 | return; | |
751 | } | |
752 | ||
753 | sk = &llcp_sock->sk; | |
754 | lock_sock(sk); | |
755 | if (sk->sk_state == LLCP_CLOSED) { | |
756 | release_sock(sk); | |
757 | nfc_llcp_sock_put(llcp_sock); | |
758 | } | |
759 | ||
760 | ||
761 | if (sk->sk_state == LLCP_CONNECTED) { | |
762 | nfc_put_device(local->dev); | |
763 | sk->sk_state = LLCP_CLOSED; | |
764 | sk->sk_state_change(sk); | |
765 | } | |
766 | ||
767 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); | |
768 | ||
769 | release_sock(sk); | |
770 | nfc_llcp_sock_put(llcp_sock); | |
771 | } | |
772 | ||
773 | static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, | |
774 | struct sk_buff *skb) | |
775 | { | |
776 | struct nfc_llcp_sock *llcp_sock; | |
777 | u8 dsap, ssap; | |
778 | ||
779 | ||
780 | dsap = nfc_llcp_dsap(skb); | |
781 | ssap = nfc_llcp_ssap(skb); | |
782 | ||
783 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
784 | ||
785 | if (llcp_sock == NULL) | |
786 | llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); | |
787 | ||
788 | if (llcp_sock == NULL) { | |
789 | pr_err("Invalid CC\n"); | |
790 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
791 | ||
792 | return; | |
793 | } | |
794 | ||
795 | llcp_sock->dsap = ssap; | |
796 | ||
797 | nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE], | |
798 | skb->len - LLCP_HEADER_SIZE); | |
799 | ||
800 | nfc_llcp_sock_put(llcp_sock); | |
801 | } | |
802 | ||
803 | static void nfc_llcp_rx_work(struct work_struct *work) | |
804 | { | |
805 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
806 | rx_work); | |
807 | u8 dsap, ssap, ptype; | |
808 | struct sk_buff *skb; | |
809 | ||
810 | skb = local->rx_pending; | |
811 | if (skb == NULL) { | |
812 | pr_debug("No pending SKB\n"); | |
813 | return; | |
814 | } | |
815 | ||
816 | ptype = nfc_llcp_ptype(skb); | |
817 | dsap = nfc_llcp_dsap(skb); | |
818 | ssap = nfc_llcp_ssap(skb); | |
819 | ||
820 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
821 | ||
822 | switch (ptype) { | |
823 | case LLCP_PDU_SYMM: | |
824 | pr_debug("SYMM\n"); | |
825 | break; | |
826 | ||
827 | case LLCP_PDU_CONNECT: | |
828 | pr_debug("CONNECT\n"); | |
829 | nfc_llcp_recv_connect(local, skb); | |
830 | break; | |
831 | ||
832 | case LLCP_PDU_DISC: | |
833 | pr_debug("DISC\n"); | |
834 | nfc_llcp_recv_disc(local, skb); | |
835 | break; | |
836 | ||
837 | case LLCP_PDU_CC: | |
838 | pr_debug("CC\n"); | |
839 | nfc_llcp_recv_cc(local, skb); | |
840 | break; | |
841 | ||
842 | case LLCP_PDU_I: | |
843 | case LLCP_PDU_RR: | |
53aef920 | 844 | case LLCP_PDU_RNR: |
d646960f SO |
845 | pr_debug("I frame\n"); |
846 | nfc_llcp_recv_hdlc(local, skb); | |
847 | break; | |
848 | ||
849 | } | |
850 | ||
851 | queue_work(local->tx_wq, &local->tx_work); | |
852 | kfree_skb(local->rx_pending); | |
853 | local->rx_pending = NULL; | |
854 | ||
855 | return; | |
856 | } | |
857 | ||
858 | void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) | |
859 | { | |
860 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
861 | ||
862 | pr_debug("Received an LLCP PDU\n"); | |
863 | if (err < 0) { | |
864 | pr_err("err %d", err); | |
865 | return; | |
866 | } | |
867 | ||
868 | local->rx_pending = skb_get(skb); | |
869 | del_timer(&local->link_timer); | |
870 | queue_work(local->rx_wq, &local->rx_work); | |
871 | ||
872 | return; | |
873 | } | |
874 | ||
875 | void nfc_llcp_mac_is_down(struct nfc_dev *dev) | |
876 | { | |
877 | struct nfc_llcp_local *local; | |
878 | ||
879 | local = nfc_llcp_find_local(dev); | |
880 | if (local == NULL) | |
881 | return; | |
882 | ||
b9a76f1d SO |
883 | nfc_llcp_clear_sdp(local); |
884 | ||
d646960f SO |
885 | /* Close and purge all existing sockets */ |
886 | nfc_llcp_socket_release(local); | |
887 | } | |
888 | ||
889 | void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, | |
890 | u8 comm_mode, u8 rf_mode) | |
891 | { | |
892 | struct nfc_llcp_local *local; | |
893 | ||
894 | pr_debug("rf mode %d\n", rf_mode); | |
895 | ||
896 | local = nfc_llcp_find_local(dev); | |
897 | if (local == NULL) | |
898 | return; | |
899 | ||
900 | local->target_idx = target_idx; | |
901 | local->comm_mode = comm_mode; | |
902 | local->rf_mode = rf_mode; | |
903 | ||
904 | if (rf_mode == NFC_RF_INITIATOR) { | |
905 | pr_debug("Queueing Tx work\n"); | |
906 | ||
907 | queue_work(local->tx_wq, &local->tx_work); | |
908 | } else { | |
909 | mod_timer(&local->link_timer, | |
910 | jiffies + msecs_to_jiffies(local->remote_lto)); | |
911 | } | |
912 | } | |
913 | ||
914 | int nfc_llcp_register_device(struct nfc_dev *ndev) | |
915 | { | |
916 | struct device *dev = &ndev->dev; | |
917 | struct nfc_llcp_local *local; | |
918 | char name[32]; | |
919 | int err; | |
920 | ||
921 | local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); | |
922 | if (local == NULL) | |
923 | return -ENOMEM; | |
924 | ||
925 | local->dev = ndev; | |
926 | INIT_LIST_HEAD(&local->list); | |
927 | mutex_init(&local->sdp_lock); | |
928 | mutex_init(&local->socket_lock); | |
929 | init_timer(&local->link_timer); | |
930 | local->link_timer.data = (unsigned long) local; | |
931 | local->link_timer.function = nfc_llcp_symm_timer; | |
932 | ||
933 | skb_queue_head_init(&local->tx_queue); | |
934 | INIT_WORK(&local->tx_work, nfc_llcp_tx_work); | |
935 | snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev)); | |
936 | local->tx_wq = alloc_workqueue(name, | |
937 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
938 | if (local->tx_wq == NULL) { | |
939 | err = -ENOMEM; | |
940 | goto err_local; | |
941 | } | |
942 | ||
943 | local->rx_pending = NULL; | |
944 | INIT_WORK(&local->rx_work, nfc_llcp_rx_work); | |
945 | snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev)); | |
946 | local->rx_wq = alloc_workqueue(name, | |
947 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
948 | if (local->rx_wq == NULL) { | |
949 | err = -ENOMEM; | |
950 | goto err_tx_wq; | |
951 | } | |
952 | ||
953 | INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); | |
954 | snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev)); | |
955 | local->timeout_wq = alloc_workqueue(name, | |
956 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
957 | if (local->timeout_wq == NULL) { | |
958 | err = -ENOMEM; | |
959 | goto err_rx_wq; | |
960 | } | |
961 | ||
962 | nfc_llcp_build_gb(local); | |
963 | ||
964 | local->remote_miu = LLCP_DEFAULT_MIU; | |
965 | local->remote_lto = LLCP_DEFAULT_LTO; | |
966 | local->remote_rw = LLCP_DEFAULT_RW; | |
967 | ||
968 | list_add(&llcp_devices, &local->list); | |
969 | ||
970 | return 0; | |
971 | ||
972 | err_rx_wq: | |
973 | destroy_workqueue(local->rx_wq); | |
974 | ||
975 | err_tx_wq: | |
976 | destroy_workqueue(local->tx_wq); | |
977 | ||
978 | err_local: | |
979 | kfree(local); | |
980 | ||
981 | return 0; | |
982 | } | |
983 | ||
984 | void nfc_llcp_unregister_device(struct nfc_dev *dev) | |
985 | { | |
986 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
987 | ||
988 | if (local == NULL) { | |
989 | pr_debug("No such device\n"); | |
990 | return; | |
991 | } | |
992 | ||
993 | list_del(&local->list); | |
994 | nfc_llcp_socket_release(local); | |
995 | del_timer_sync(&local->link_timer); | |
996 | skb_queue_purge(&local->tx_queue); | |
997 | destroy_workqueue(local->tx_wq); | |
998 | destroy_workqueue(local->rx_wq); | |
5b68a7ca | 999 | kfree_skb(local->rx_pending); |
d646960f SO |
1000 | kfree(local); |
1001 | } | |
1002 | ||
1003 | int __init nfc_llcp_init(void) | |
1004 | { | |
1005 | INIT_LIST_HEAD(&llcp_devices); | |
1006 | ||
1007 | return nfc_llcp_sock_init(); | |
1008 | } | |
1009 | ||
1010 | void nfc_llcp_exit(void) | |
1011 | { | |
1012 | nfc_llcp_sock_exit(); | |
1013 | } |