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 | ||
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 | ||
d646960f SO |
40 | mutex_lock(&local->socket_lock); |
41 | ||
42 | for (i = 0; i < LLCP_MAX_SAP; i++) { | |
43 | parent = local->sockets[i]; | |
44 | if (parent == NULL) | |
45 | continue; | |
46 | ||
47 | /* Release all child sockets */ | |
48 | list_for_each_entry_safe(s, n, &parent->list, list) { | |
40c75f81 | 49 | list_del_init(&s->list); |
d646960f SO |
50 | sk = &s->sk; |
51 | ||
52 | lock_sock(sk); | |
53 | ||
54 | if (sk->sk_state == LLCP_CONNECTED) | |
55 | nfc_put_device(s->dev); | |
56 | ||
57 | sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
58 | |
59 | release_sock(sk); | |
40c75f81 SO |
60 | |
61 | sock_orphan(sk); | |
62 | ||
63 | s->local = NULL; | |
d646960f SO |
64 | } |
65 | ||
66 | parent_sk = &parent->sk; | |
67 | ||
68 | lock_sock(parent_sk); | |
69 | ||
70 | if (parent_sk->sk_state == LLCP_LISTEN) { | |
71 | struct nfc_llcp_sock *lsk, *n; | |
72 | struct sock *accept_sk; | |
73 | ||
74 | list_for_each_entry_safe(lsk, n, &parent->accept_queue, | |
427a2eb1 | 75 | accept_queue) { |
d646960f SO |
76 | accept_sk = &lsk->sk; |
77 | lock_sock(accept_sk); | |
78 | ||
79 | nfc_llcp_accept_unlink(accept_sk); | |
80 | ||
81 | accept_sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
82 | |
83 | release_sock(accept_sk); | |
84 | ||
85 | sock_orphan(accept_sk); | |
40c75f81 SO |
86 | |
87 | lsk->local = NULL; | |
d646960f SO |
88 | } |
89 | } | |
90 | ||
91 | if (parent_sk->sk_state == LLCP_CONNECTED) | |
92 | nfc_put_device(parent->dev); | |
93 | ||
94 | parent_sk->sk_state = LLCP_CLOSED; | |
d646960f SO |
95 | |
96 | release_sock(parent_sk); | |
40c75f81 SO |
97 | |
98 | sock_orphan(parent_sk); | |
99 | ||
100 | parent->local = NULL; | |
d646960f SO |
101 | } |
102 | ||
103 | mutex_unlock(&local->socket_lock); | |
104 | } | |
105 | ||
b9a76f1d SO |
106 | static void nfc_llcp_clear_sdp(struct nfc_llcp_local *local) |
107 | { | |
108 | mutex_lock(&local->sdp_lock); | |
109 | ||
110 | local->local_wks = 0; | |
111 | local->local_sdp = 0; | |
112 | local->local_sap = 0; | |
113 | ||
114 | mutex_unlock(&local->sdp_lock); | |
115 | } | |
116 | ||
d646960f SO |
117 | static void nfc_llcp_timeout_work(struct work_struct *work) |
118 | { | |
119 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 120 | timeout_work); |
d646960f SO |
121 | |
122 | nfc_dep_link_down(local->dev); | |
123 | } | |
124 | ||
125 | static void nfc_llcp_symm_timer(unsigned long data) | |
126 | { | |
127 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
128 | ||
129 | pr_err("SYMM timeout\n"); | |
130 | ||
131 | queue_work(local->timeout_wq, &local->timeout_work); | |
132 | } | |
133 | ||
134 | struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev) | |
135 | { | |
136 | struct nfc_llcp_local *local, *n; | |
137 | ||
138 | list_for_each_entry_safe(local, n, &llcp_devices, list) | |
139 | if (local->dev == dev) | |
140 | return local; | |
141 | ||
142 | pr_debug("No device found\n"); | |
143 | ||
144 | return NULL; | |
145 | } | |
146 | ||
147 | static char *wks[] = { | |
148 | NULL, | |
149 | NULL, /* SDP */ | |
150 | "urn:nfc:sn:ip", | |
151 | "urn:nfc:sn:obex", | |
152 | "urn:nfc:sn:snep", | |
153 | }; | |
154 | ||
155 | static int nfc_llcp_wks_sap(char *service_name, size_t service_name_len) | |
156 | { | |
157 | int sap, num_wks; | |
158 | ||
159 | pr_debug("%s\n", service_name); | |
160 | ||
161 | if (service_name == NULL) | |
162 | return -EINVAL; | |
163 | ||
164 | num_wks = ARRAY_SIZE(wks); | |
165 | ||
427a2eb1 | 166 | for (sap = 0; sap < num_wks; sap++) { |
d646960f SO |
167 | if (wks[sap] == NULL) |
168 | continue; | |
169 | ||
170 | if (strncmp(wks[sap], service_name, service_name_len) == 0) | |
171 | return sap; | |
172 | } | |
173 | ||
174 | return -EINVAL; | |
175 | } | |
176 | ||
177 | u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local, | |
427a2eb1 | 178 | struct nfc_llcp_sock *sock) |
d646960f SO |
179 | { |
180 | mutex_lock(&local->sdp_lock); | |
181 | ||
182 | if (sock->service_name != NULL && sock->service_name_len > 0) { | |
183 | int ssap = nfc_llcp_wks_sap(sock->service_name, | |
427a2eb1 | 184 | sock->service_name_len); |
d646960f SO |
185 | |
186 | if (ssap > 0) { | |
187 | pr_debug("WKS %d\n", ssap); | |
188 | ||
189 | /* This is a WKS, let's check if it's free */ | |
190 | if (local->local_wks & BIT(ssap)) { | |
191 | mutex_unlock(&local->sdp_lock); | |
192 | ||
193 | return LLCP_SAP_MAX; | |
194 | } | |
195 | ||
1762c17c | 196 | set_bit(ssap, &local->local_wks); |
d646960f SO |
197 | mutex_unlock(&local->sdp_lock); |
198 | ||
199 | return ssap; | |
200 | } | |
201 | ||
202 | /* | |
203 | * This is not a well known service, | |
204 | * we should try to find a local SDP free spot | |
205 | */ | |
206 | ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP); | |
207 | if (ssap == LLCP_SDP_NUM_SAP) { | |
208 | mutex_unlock(&local->sdp_lock); | |
209 | ||
210 | return LLCP_SAP_MAX; | |
211 | } | |
212 | ||
213 | pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap); | |
214 | ||
1762c17c | 215 | set_bit(ssap, &local->local_sdp); |
d646960f SO |
216 | mutex_unlock(&local->sdp_lock); |
217 | ||
218 | return LLCP_WKS_NUM_SAP + ssap; | |
219 | ||
220 | } else if (sock->ssap != 0) { | |
221 | if (sock->ssap < LLCP_WKS_NUM_SAP) { | |
1762c17c SO |
222 | if (!test_bit(sock->ssap, &local->local_wks)) { |
223 | set_bit(sock->ssap, &local->local_wks); | |
d646960f SO |
224 | mutex_unlock(&local->sdp_lock); |
225 | ||
226 | return sock->ssap; | |
227 | } | |
228 | ||
229 | } else if (sock->ssap < LLCP_SDP_NUM_SAP) { | |
1762c17c SO |
230 | if (!test_bit(sock->ssap - LLCP_WKS_NUM_SAP, |
231 | &local->local_sdp)) { | |
232 | set_bit(sock->ssap - LLCP_WKS_NUM_SAP, | |
233 | &local->local_sdp); | |
d646960f SO |
234 | mutex_unlock(&local->sdp_lock); |
235 | ||
236 | return sock->ssap; | |
237 | } | |
238 | } | |
239 | } | |
240 | ||
241 | mutex_unlock(&local->sdp_lock); | |
242 | ||
243 | return LLCP_SAP_MAX; | |
244 | } | |
245 | ||
246 | u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local) | |
247 | { | |
248 | u8 local_ssap; | |
249 | ||
250 | mutex_lock(&local->sdp_lock); | |
251 | ||
252 | local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP); | |
253 | if (local_ssap == LLCP_LOCAL_NUM_SAP) { | |
254 | mutex_unlock(&local->sdp_lock); | |
255 | return LLCP_SAP_MAX; | |
256 | } | |
257 | ||
1762c17c | 258 | set_bit(local_ssap, &local->local_sap); |
d646960f SO |
259 | |
260 | mutex_unlock(&local->sdp_lock); | |
261 | ||
262 | return local_ssap + LLCP_LOCAL_SAP_OFFSET; | |
263 | } | |
264 | ||
265 | void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap) | |
266 | { | |
267 | u8 local_ssap; | |
268 | unsigned long *sdp; | |
269 | ||
270 | if (ssap < LLCP_WKS_NUM_SAP) { | |
271 | local_ssap = ssap; | |
272 | sdp = &local->local_wks; | |
273 | } else if (ssap < LLCP_LOCAL_NUM_SAP) { | |
274 | local_ssap = ssap - LLCP_WKS_NUM_SAP; | |
275 | sdp = &local->local_sdp; | |
276 | } else if (ssap < LLCP_MAX_SAP) { | |
277 | local_ssap = ssap - LLCP_LOCAL_NUM_SAP; | |
278 | sdp = &local->local_sap; | |
279 | } else { | |
280 | return; | |
281 | } | |
282 | ||
283 | mutex_lock(&local->sdp_lock); | |
284 | ||
1762c17c | 285 | clear_bit(local_ssap, sdp); |
d646960f SO |
286 | |
287 | mutex_unlock(&local->sdp_lock); | |
288 | } | |
289 | ||
47807d3d | 290 | u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len) |
d646960f SO |
291 | { |
292 | struct nfc_llcp_local *local; | |
293 | ||
294 | local = nfc_llcp_find_local(dev); | |
295 | if (local == NULL) { | |
296 | *general_bytes_len = 0; | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | *general_bytes_len = local->gb_len; | |
301 | ||
302 | return local->gb; | |
303 | } | |
304 | ||
305 | static int nfc_llcp_build_gb(struct nfc_llcp_local *local) | |
306 | { | |
307 | u8 *gb_cur, *version_tlv, version, version_length; | |
308 | u8 *lto_tlv, lto, lto_length; | |
309 | u8 *wks_tlv, wks_length; | |
56d5876a SO |
310 | u8 *miux_tlv, miux_length; |
311 | __be16 miux; | |
d646960f SO |
312 | u8 gb_len = 0; |
313 | ||
314 | version = LLCP_VERSION_11; | |
315 | version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version, | |
427a2eb1 | 316 | 1, &version_length); |
d646960f SO |
317 | gb_len += version_length; |
318 | ||
319 | /* 1500 ms */ | |
320 | lto = 150; | |
321 | lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, <o, 1, <o_length); | |
322 | gb_len += lto_length; | |
323 | ||
324 | pr_debug("Local wks 0x%lx\n", local->local_wks); | |
325 | wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&local->local_wks, 2, | |
427a2eb1 | 326 | &wks_length); |
d646960f SO |
327 | gb_len += wks_length; |
328 | ||
56d5876a SO |
329 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
330 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, | |
331 | &miux_length); | |
332 | gb_len += miux_length; | |
333 | ||
d646960f SO |
334 | gb_len += ARRAY_SIZE(llcp_magic); |
335 | ||
336 | if (gb_len > NFC_MAX_GT_LEN) { | |
337 | kfree(version_tlv); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
341 | gb_cur = local->gb; | |
342 | ||
343 | memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic)); | |
344 | gb_cur += ARRAY_SIZE(llcp_magic); | |
345 | ||
346 | memcpy(gb_cur, version_tlv, version_length); | |
347 | gb_cur += version_length; | |
348 | ||
349 | memcpy(gb_cur, lto_tlv, lto_length); | |
350 | gb_cur += lto_length; | |
351 | ||
352 | memcpy(gb_cur, wks_tlv, wks_length); | |
353 | gb_cur += wks_length; | |
354 | ||
56d5876a SO |
355 | memcpy(gb_cur, miux_tlv, miux_length); |
356 | gb_cur += miux_length; | |
357 | ||
d646960f SO |
358 | kfree(version_tlv); |
359 | kfree(lto_tlv); | |
360 | ||
361 | local->gb_len = gb_len; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | int nfc_llcp_set_remote_gb(struct nfc_dev *dev, u8 *gb, u8 gb_len) | |
367 | { | |
368 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
369 | ||
370 | if (local == NULL) { | |
371 | pr_err("No LLCP device\n"); | |
372 | return -ENODEV; | |
373 | } | |
374 | ||
375 | memset(local->remote_gb, 0, NFC_MAX_GT_LEN); | |
376 | memcpy(local->remote_gb, gb, gb_len); | |
377 | local->remote_gb_len = gb_len; | |
378 | ||
427a2eb1 | 379 | if (local->remote_gb == NULL || local->remote_gb_len == 0) |
d646960f SO |
380 | return -ENODEV; |
381 | ||
382 | if (memcmp(local->remote_gb, llcp_magic, 3)) { | |
383 | pr_err("MAC does not support LLCP\n"); | |
384 | return -EINVAL; | |
385 | } | |
386 | ||
387 | return nfc_llcp_parse_tlv(local, | |
427a2eb1 SO |
388 | &local->remote_gb[3], |
389 | local->remote_gb_len - 3); | |
d646960f SO |
390 | } |
391 | ||
392 | static void nfc_llcp_tx_work(struct work_struct *work) | |
393 | { | |
394 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 395 | tx_work); |
d646960f SO |
396 | struct sk_buff *skb; |
397 | ||
398 | skb = skb_dequeue(&local->tx_queue); | |
399 | if (skb != NULL) { | |
400 | pr_debug("Sending pending skb\n"); | |
4be646ec SO |
401 | print_hex_dump(KERN_DEBUG, "LLCP Tx: ", DUMP_PREFIX_OFFSET, |
402 | 16, 1, skb->data, skb->len, true); | |
403 | ||
d646960f | 404 | nfc_data_exchange(local->dev, local->target_idx, |
427a2eb1 | 405 | skb, nfc_llcp_recv, local); |
d646960f SO |
406 | } else { |
407 | nfc_llcp_send_symm(local->dev); | |
408 | } | |
409 | ||
410 | mod_timer(&local->link_timer, | |
427a2eb1 | 411 | jiffies + msecs_to_jiffies(local->remote_lto)); |
d646960f SO |
412 | } |
413 | ||
414 | static u8 nfc_llcp_dsap(struct sk_buff *pdu) | |
415 | { | |
416 | return (pdu->data[0] & 0xfc) >> 2; | |
417 | } | |
418 | ||
419 | static u8 nfc_llcp_ptype(struct sk_buff *pdu) | |
420 | { | |
421 | return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6); | |
422 | } | |
423 | ||
424 | static u8 nfc_llcp_ssap(struct sk_buff *pdu) | |
425 | { | |
426 | return pdu->data[1] & 0x3f; | |
427 | } | |
428 | ||
429 | static u8 nfc_llcp_ns(struct sk_buff *pdu) | |
430 | { | |
431 | return pdu->data[2] >> 4; | |
432 | } | |
433 | ||
434 | static u8 nfc_llcp_nr(struct sk_buff *pdu) | |
435 | { | |
436 | return pdu->data[2] & 0xf; | |
437 | } | |
438 | ||
439 | static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu) | |
440 | { | |
279cf174 | 441 | pdu->data[2] = (sock->send_n << 4) | (sock->recv_n); |
d646960f SO |
442 | sock->send_n = (sock->send_n + 1) % 16; |
443 | sock->recv_ack_n = (sock->recv_n - 1) % 16; | |
444 | } | |
445 | ||
446 | static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local, | |
427a2eb1 | 447 | u8 ssap, u8 dsap) |
d646960f SO |
448 | { |
449 | struct nfc_llcp_sock *sock, *llcp_sock, *n; | |
450 | ||
451 | if (ssap == 0 && dsap == 0) | |
452 | return NULL; | |
453 | ||
454 | mutex_lock(&local->socket_lock); | |
455 | sock = local->sockets[ssap]; | |
456 | if (sock == NULL) { | |
457 | mutex_unlock(&local->socket_lock); | |
458 | return NULL; | |
459 | } | |
460 | ||
461 | pr_debug("root dsap %d (%d)\n", sock->dsap, dsap); | |
462 | ||
463 | if (sock->dsap == dsap) { | |
464 | sock_hold(&sock->sk); | |
465 | mutex_unlock(&local->socket_lock); | |
466 | return sock; | |
467 | } | |
468 | ||
469 | list_for_each_entry_safe(llcp_sock, n, &sock->list, list) { | |
470 | pr_debug("llcp_sock %p sk %p dsap %d\n", llcp_sock, | |
427a2eb1 | 471 | &llcp_sock->sk, llcp_sock->dsap); |
d646960f SO |
472 | if (llcp_sock->dsap == dsap) { |
473 | sock_hold(&llcp_sock->sk); | |
474 | mutex_unlock(&local->socket_lock); | |
475 | return llcp_sock; | |
476 | } | |
477 | } | |
478 | ||
479 | pr_err("Could not find socket for %d %d\n", ssap, dsap); | |
480 | ||
481 | mutex_unlock(&local->socket_lock); | |
482 | ||
483 | return NULL; | |
484 | } | |
485 | ||
486 | static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock) | |
487 | { | |
488 | sock_put(&sock->sk); | |
489 | } | |
490 | ||
491 | static u8 *nfc_llcp_connect_sn(struct sk_buff *skb, size_t *sn_len) | |
492 | { | |
493 | u8 *tlv = &skb->data[2], type, length; | |
494 | size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0; | |
495 | ||
496 | while (offset < tlv_array_len) { | |
497 | type = tlv[0]; | |
498 | length = tlv[1]; | |
499 | ||
500 | pr_debug("type 0x%x length %d\n", type, length); | |
501 | ||
502 | if (type == LLCP_TLV_SN) { | |
503 | *sn_len = length; | |
504 | return &tlv[2]; | |
505 | } | |
506 | ||
507 | offset += length + 2; | |
508 | tlv += length + 2; | |
509 | } | |
510 | ||
511 | return NULL; | |
512 | } | |
513 | ||
514 | static void nfc_llcp_recv_connect(struct nfc_llcp_local *local, | |
427a2eb1 | 515 | struct sk_buff *skb) |
d646960f SO |
516 | { |
517 | struct sock *new_sk, *parent; | |
518 | struct nfc_llcp_sock *sock, *new_sock; | |
519 | u8 dsap, ssap, bound_sap, reason; | |
520 | ||
521 | dsap = nfc_llcp_dsap(skb); | |
522 | ssap = nfc_llcp_ssap(skb); | |
523 | ||
524 | pr_debug("%d %d\n", dsap, ssap); | |
525 | ||
526 | nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE], | |
427a2eb1 | 527 | skb->len - LLCP_HEADER_SIZE); |
d646960f SO |
528 | |
529 | if (dsap != LLCP_SAP_SDP) { | |
530 | bound_sap = dsap; | |
531 | ||
532 | mutex_lock(&local->socket_lock); | |
533 | sock = local->sockets[dsap]; | |
534 | if (sock == NULL) { | |
535 | mutex_unlock(&local->socket_lock); | |
536 | reason = LLCP_DM_NOBOUND; | |
537 | goto fail; | |
538 | } | |
539 | ||
540 | sock_hold(&sock->sk); | |
541 | mutex_unlock(&local->socket_lock); | |
542 | ||
543 | lock_sock(&sock->sk); | |
544 | ||
545 | if (sock->dsap == LLCP_SAP_SDP && | |
427a2eb1 | 546 | sock->sk.sk_state == LLCP_LISTEN) |
d646960f SO |
547 | goto enqueue; |
548 | } else { | |
549 | u8 *sn; | |
550 | size_t sn_len; | |
551 | ||
552 | sn = nfc_llcp_connect_sn(skb, &sn_len); | |
553 | if (sn == NULL) { | |
554 | reason = LLCP_DM_NOBOUND; | |
555 | goto fail; | |
556 | } | |
557 | ||
558 | pr_debug("Service name length %zu\n", sn_len); | |
559 | ||
560 | mutex_lock(&local->socket_lock); | |
561 | for (bound_sap = 0; bound_sap < LLCP_LOCAL_SAP_OFFSET; | |
427a2eb1 | 562 | bound_sap++) { |
d646960f SO |
563 | sock = local->sockets[bound_sap]; |
564 | if (sock == NULL) | |
565 | continue; | |
566 | ||
567 | if (sock->service_name == NULL || | |
427a2eb1 | 568 | sock->service_name_len == 0) |
d646960f SO |
569 | continue; |
570 | ||
571 | if (sock->service_name_len != sn_len) | |
572 | continue; | |
573 | ||
574 | if (sock->dsap == LLCP_SAP_SDP && | |
427a2eb1 SO |
575 | sock->sk.sk_state == LLCP_LISTEN && |
576 | !memcmp(sn, sock->service_name, sn_len)) { | |
d646960f | 577 | pr_debug("Found service name at SAP %d\n", |
427a2eb1 | 578 | bound_sap); |
d646960f SO |
579 | sock_hold(&sock->sk); |
580 | mutex_unlock(&local->socket_lock); | |
581 | ||
582 | lock_sock(&sock->sk); | |
583 | ||
584 | goto enqueue; | |
585 | } | |
586 | } | |
341ee434 | 587 | mutex_unlock(&local->socket_lock); |
d646960f SO |
588 | } |
589 | ||
d646960f SO |
590 | reason = LLCP_DM_NOBOUND; |
591 | goto fail; | |
592 | ||
593 | enqueue: | |
594 | parent = &sock->sk; | |
595 | ||
596 | if (sk_acceptq_is_full(parent)) { | |
597 | reason = LLCP_DM_REJ; | |
598 | release_sock(&sock->sk); | |
599 | sock_put(&sock->sk); | |
600 | goto fail; | |
601 | } | |
602 | ||
427a2eb1 | 603 | new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC); |
d646960f SO |
604 | if (new_sk == NULL) { |
605 | reason = LLCP_DM_REJ; | |
606 | release_sock(&sock->sk); | |
607 | sock_put(&sock->sk); | |
608 | goto fail; | |
609 | } | |
610 | ||
611 | new_sock = nfc_llcp_sock(new_sk); | |
612 | new_sock->dev = local->dev; | |
613 | new_sock->local = local; | |
614 | new_sock->nfc_protocol = sock->nfc_protocol; | |
615 | new_sock->ssap = bound_sap; | |
616 | new_sock->dsap = ssap; | |
617 | new_sock->parent = parent; | |
618 | ||
619 | pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk); | |
620 | ||
621 | list_add_tail(&new_sock->list, &sock->list); | |
622 | ||
623 | nfc_llcp_accept_enqueue(&sock->sk, new_sk); | |
624 | ||
625 | nfc_get_device(local->dev->idx); | |
626 | ||
627 | new_sk->sk_state = LLCP_CONNECTED; | |
628 | ||
629 | /* Wake the listening processes */ | |
630 | parent->sk_data_ready(parent, 0); | |
631 | ||
632 | /* Send CC */ | |
633 | nfc_llcp_send_cc(new_sock); | |
634 | ||
635 | release_sock(&sock->sk); | |
636 | sock_put(&sock->sk); | |
637 | ||
638 | return; | |
639 | ||
640 | fail: | |
641 | /* Send DM */ | |
642 | nfc_llcp_send_dm(local, dsap, ssap, reason); | |
643 | ||
644 | return; | |
645 | ||
646 | } | |
647 | ||
d094afa1 | 648 | int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock) |
4722d2b7 | 649 | { |
d094afa1 | 650 | int nr_frames = 0; |
4722d2b7 SO |
651 | struct nfc_llcp_local *local = sock->local; |
652 | ||
653 | pr_debug("Remote ready %d tx queue len %d remote rw %d", | |
427a2eb1 SO |
654 | sock->remote_ready, skb_queue_len(&sock->tx_pending_queue), |
655 | local->remote_rw); | |
4722d2b7 SO |
656 | |
657 | /* Try to queue some I frames for transmission */ | |
658 | while (sock->remote_ready && | |
427a2eb1 | 659 | skb_queue_len(&sock->tx_pending_queue) < local->remote_rw) { |
4722d2b7 SO |
660 | struct sk_buff *pdu, *pending_pdu; |
661 | ||
662 | pdu = skb_dequeue(&sock->tx_queue); | |
663 | if (pdu == NULL) | |
664 | break; | |
665 | ||
666 | /* Update N(S)/N(R) */ | |
667 | nfc_llcp_set_nrns(sock, pdu); | |
668 | ||
669 | pending_pdu = skb_clone(pdu, GFP_KERNEL); | |
670 | ||
671 | skb_queue_tail(&local->tx_queue, pdu); | |
672 | skb_queue_tail(&sock->tx_pending_queue, pending_pdu); | |
d094afa1 | 673 | nr_frames++; |
4722d2b7 | 674 | } |
d094afa1 SO |
675 | |
676 | return nr_frames; | |
4722d2b7 SO |
677 | } |
678 | ||
d646960f | 679 | static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local, |
427a2eb1 | 680 | struct sk_buff *skb) |
d646960f SO |
681 | { |
682 | struct nfc_llcp_sock *llcp_sock; | |
683 | struct sock *sk; | |
684 | u8 dsap, ssap, ptype, ns, nr; | |
685 | ||
686 | ptype = nfc_llcp_ptype(skb); | |
687 | dsap = nfc_llcp_dsap(skb); | |
688 | ssap = nfc_llcp_ssap(skb); | |
689 | ns = nfc_llcp_ns(skb); | |
690 | nr = nfc_llcp_nr(skb); | |
691 | ||
692 | pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns); | |
693 | ||
694 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
695 | if (llcp_sock == NULL) { | |
696 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
697 | return; | |
698 | } | |
699 | ||
700 | sk = &llcp_sock->sk; | |
701 | lock_sock(sk); | |
702 | if (sk->sk_state == LLCP_CLOSED) { | |
703 | release_sock(sk); | |
704 | nfc_llcp_sock_put(llcp_sock); | |
705 | } | |
706 | ||
d646960f SO |
707 | /* Pass the payload upstream */ |
708 | if (ptype == LLCP_PDU_I) { | |
709 | pr_debug("I frame, queueing on %p\n", &llcp_sock->sk); | |
710 | ||
53aef920 SO |
711 | if (ns == llcp_sock->recv_n) |
712 | llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16; | |
713 | else | |
714 | pr_err("Received out of sequence I PDU\n"); | |
715 | ||
d646960f SO |
716 | skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE); |
717 | if (sock_queue_rcv_skb(&llcp_sock->sk, skb)) { | |
718 | pr_err("receive queue is full\n"); | |
719 | skb_queue_head(&llcp_sock->tx_backlog_queue, skb); | |
720 | } | |
721 | } | |
722 | ||
723 | /* Remove skbs from the pending queue */ | |
724 | if (llcp_sock->send_ack_n != nr) { | |
725 | struct sk_buff *s, *tmp; | |
726 | ||
727 | llcp_sock->send_ack_n = nr; | |
728 | ||
729 | skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) | |
730 | if (nfc_llcp_ns(s) <= nr) { | |
731 | skb_unlink(s, &llcp_sock->tx_pending_queue); | |
732 | kfree_skb(s); | |
733 | } | |
734 | } | |
735 | ||
53aef920 SO |
736 | if (ptype == LLCP_PDU_RR) |
737 | llcp_sock->remote_ready = true; | |
427a2eb1 | 738 | else if (ptype == LLCP_PDU_RNR) |
53aef920 SO |
739 | llcp_sock->remote_ready = false; |
740 | ||
d094afa1 SO |
741 | if (nfc_llcp_queue_i_frames(llcp_sock) == 0) |
742 | nfc_llcp_send_rr(llcp_sock); | |
d646960f SO |
743 | |
744 | release_sock(sk); | |
745 | nfc_llcp_sock_put(llcp_sock); | |
746 | } | |
747 | ||
748 | static void nfc_llcp_recv_disc(struct nfc_llcp_local *local, | |
427a2eb1 | 749 | struct sk_buff *skb) |
d646960f SO |
750 | { |
751 | struct nfc_llcp_sock *llcp_sock; | |
752 | struct sock *sk; | |
753 | u8 dsap, ssap; | |
754 | ||
755 | dsap = nfc_llcp_dsap(skb); | |
756 | ssap = nfc_llcp_ssap(skb); | |
757 | ||
758 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
759 | if (llcp_sock == NULL) { | |
760 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
761 | return; | |
762 | } | |
763 | ||
764 | sk = &llcp_sock->sk; | |
765 | lock_sock(sk); | |
766 | if (sk->sk_state == LLCP_CLOSED) { | |
767 | release_sock(sk); | |
768 | nfc_llcp_sock_put(llcp_sock); | |
769 | } | |
770 | ||
d646960f SO |
771 | if (sk->sk_state == LLCP_CONNECTED) { |
772 | nfc_put_device(local->dev); | |
773 | sk->sk_state = LLCP_CLOSED; | |
774 | sk->sk_state_change(sk); | |
775 | } | |
776 | ||
777 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC); | |
778 | ||
779 | release_sock(sk); | |
780 | nfc_llcp_sock_put(llcp_sock); | |
781 | } | |
782 | ||
427a2eb1 | 783 | static void nfc_llcp_recv_cc(struct nfc_llcp_local *local, struct sk_buff *skb) |
d646960f SO |
784 | { |
785 | struct nfc_llcp_sock *llcp_sock; | |
786 | u8 dsap, ssap; | |
787 | ||
d646960f SO |
788 | dsap = nfc_llcp_dsap(skb); |
789 | ssap = nfc_llcp_ssap(skb); | |
790 | ||
791 | llcp_sock = nfc_llcp_sock_get(local, dsap, ssap); | |
792 | ||
793 | if (llcp_sock == NULL) | |
794 | llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP); | |
795 | ||
796 | if (llcp_sock == NULL) { | |
797 | pr_err("Invalid CC\n"); | |
798 | nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN); | |
799 | ||
800 | return; | |
801 | } | |
802 | ||
803 | llcp_sock->dsap = ssap; | |
804 | ||
805 | nfc_llcp_parse_tlv(local, &skb->data[LLCP_HEADER_SIZE], | |
427a2eb1 | 806 | skb->len - LLCP_HEADER_SIZE); |
d646960f SO |
807 | |
808 | nfc_llcp_sock_put(llcp_sock); | |
809 | } | |
810 | ||
811 | static void nfc_llcp_rx_work(struct work_struct *work) | |
812 | { | |
813 | struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local, | |
427a2eb1 | 814 | rx_work); |
d646960f SO |
815 | u8 dsap, ssap, ptype; |
816 | struct sk_buff *skb; | |
817 | ||
818 | skb = local->rx_pending; | |
819 | if (skb == NULL) { | |
820 | pr_debug("No pending SKB\n"); | |
821 | return; | |
822 | } | |
823 | ||
824 | ptype = nfc_llcp_ptype(skb); | |
825 | dsap = nfc_llcp_dsap(skb); | |
826 | ssap = nfc_llcp_ssap(skb); | |
827 | ||
828 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
829 | ||
4be646ec SO |
830 | if (ptype != LLCP_PDU_SYMM) |
831 | print_hex_dump(KERN_DEBUG, "LLCP Rx: ", DUMP_PREFIX_OFFSET, | |
832 | 16, 1, skb->data, skb->len, true); | |
833 | ||
d646960f SO |
834 | switch (ptype) { |
835 | case LLCP_PDU_SYMM: | |
836 | pr_debug("SYMM\n"); | |
837 | break; | |
838 | ||
839 | case LLCP_PDU_CONNECT: | |
840 | pr_debug("CONNECT\n"); | |
841 | nfc_llcp_recv_connect(local, skb); | |
842 | break; | |
843 | ||
844 | case LLCP_PDU_DISC: | |
845 | pr_debug("DISC\n"); | |
846 | nfc_llcp_recv_disc(local, skb); | |
847 | break; | |
848 | ||
849 | case LLCP_PDU_CC: | |
850 | pr_debug("CC\n"); | |
851 | nfc_llcp_recv_cc(local, skb); | |
852 | break; | |
853 | ||
854 | case LLCP_PDU_I: | |
855 | case LLCP_PDU_RR: | |
53aef920 | 856 | case LLCP_PDU_RNR: |
d646960f SO |
857 | pr_debug("I frame\n"); |
858 | nfc_llcp_recv_hdlc(local, skb); | |
859 | break; | |
860 | ||
861 | } | |
862 | ||
863 | queue_work(local->tx_wq, &local->tx_work); | |
864 | kfree_skb(local->rx_pending); | |
865 | local->rx_pending = NULL; | |
866 | ||
867 | return; | |
868 | } | |
869 | ||
870 | void nfc_llcp_recv(void *data, struct sk_buff *skb, int err) | |
871 | { | |
872 | struct nfc_llcp_local *local = (struct nfc_llcp_local *) data; | |
873 | ||
874 | pr_debug("Received an LLCP PDU\n"); | |
875 | if (err < 0) { | |
427a2eb1 | 876 | pr_err("err %d\n", err); |
d646960f SO |
877 | return; |
878 | } | |
879 | ||
880 | local->rx_pending = skb_get(skb); | |
881 | del_timer(&local->link_timer); | |
882 | queue_work(local->rx_wq, &local->rx_work); | |
883 | ||
884 | return; | |
885 | } | |
886 | ||
887 | void nfc_llcp_mac_is_down(struct nfc_dev *dev) | |
888 | { | |
889 | struct nfc_llcp_local *local; | |
890 | ||
891 | local = nfc_llcp_find_local(dev); | |
892 | if (local == NULL) | |
893 | return; | |
894 | ||
b9a76f1d SO |
895 | nfc_llcp_clear_sdp(local); |
896 | ||
d646960f SO |
897 | /* Close and purge all existing sockets */ |
898 | nfc_llcp_socket_release(local); | |
899 | } | |
900 | ||
901 | void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx, | |
902 | u8 comm_mode, u8 rf_mode) | |
903 | { | |
904 | struct nfc_llcp_local *local; | |
905 | ||
906 | pr_debug("rf mode %d\n", rf_mode); | |
907 | ||
908 | local = nfc_llcp_find_local(dev); | |
909 | if (local == NULL) | |
910 | return; | |
911 | ||
912 | local->target_idx = target_idx; | |
913 | local->comm_mode = comm_mode; | |
914 | local->rf_mode = rf_mode; | |
915 | ||
916 | if (rf_mode == NFC_RF_INITIATOR) { | |
917 | pr_debug("Queueing Tx work\n"); | |
918 | ||
919 | queue_work(local->tx_wq, &local->tx_work); | |
920 | } else { | |
921 | mod_timer(&local->link_timer, | |
427a2eb1 | 922 | jiffies + msecs_to_jiffies(local->remote_lto)); |
d646960f SO |
923 | } |
924 | } | |
925 | ||
926 | int nfc_llcp_register_device(struct nfc_dev *ndev) | |
927 | { | |
928 | struct device *dev = &ndev->dev; | |
929 | struct nfc_llcp_local *local; | |
930 | char name[32]; | |
931 | int err; | |
932 | ||
933 | local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL); | |
934 | if (local == NULL) | |
935 | return -ENOMEM; | |
936 | ||
937 | local->dev = ndev; | |
938 | INIT_LIST_HEAD(&local->list); | |
939 | mutex_init(&local->sdp_lock); | |
940 | mutex_init(&local->socket_lock); | |
941 | init_timer(&local->link_timer); | |
942 | local->link_timer.data = (unsigned long) local; | |
943 | local->link_timer.function = nfc_llcp_symm_timer; | |
944 | ||
945 | skb_queue_head_init(&local->tx_queue); | |
946 | INIT_WORK(&local->tx_work, nfc_llcp_tx_work); | |
947 | snprintf(name, sizeof(name), "%s_llcp_tx_wq", dev_name(dev)); | |
427a2eb1 SO |
948 | local->tx_wq = |
949 | alloc_workqueue(name, | |
950 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
951 | 1); | |
d646960f SO |
952 | if (local->tx_wq == NULL) { |
953 | err = -ENOMEM; | |
954 | goto err_local; | |
955 | } | |
956 | ||
957 | local->rx_pending = NULL; | |
958 | INIT_WORK(&local->rx_work, nfc_llcp_rx_work); | |
959 | snprintf(name, sizeof(name), "%s_llcp_rx_wq", dev_name(dev)); | |
427a2eb1 SO |
960 | local->rx_wq = |
961 | alloc_workqueue(name, | |
962 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
963 | 1); | |
d646960f SO |
964 | if (local->rx_wq == NULL) { |
965 | err = -ENOMEM; | |
966 | goto err_tx_wq; | |
967 | } | |
968 | ||
969 | INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work); | |
970 | snprintf(name, sizeof(name), "%s_llcp_timeout_wq", dev_name(dev)); | |
427a2eb1 SO |
971 | local->timeout_wq = |
972 | alloc_workqueue(name, | |
973 | WQ_NON_REENTRANT | WQ_UNBOUND | WQ_MEM_RECLAIM, | |
974 | 1); | |
d646960f SO |
975 | if (local->timeout_wq == NULL) { |
976 | err = -ENOMEM; | |
977 | goto err_rx_wq; | |
978 | } | |
979 | ||
980 | nfc_llcp_build_gb(local); | |
981 | ||
982 | local->remote_miu = LLCP_DEFAULT_MIU; | |
983 | local->remote_lto = LLCP_DEFAULT_LTO; | |
984 | local->remote_rw = LLCP_DEFAULT_RW; | |
985 | ||
986 | list_add(&llcp_devices, &local->list); | |
987 | ||
988 | return 0; | |
989 | ||
990 | err_rx_wq: | |
991 | destroy_workqueue(local->rx_wq); | |
992 | ||
993 | err_tx_wq: | |
994 | destroy_workqueue(local->tx_wq); | |
995 | ||
996 | err_local: | |
997 | kfree(local); | |
998 | ||
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | void nfc_llcp_unregister_device(struct nfc_dev *dev) | |
1003 | { | |
1004 | struct nfc_llcp_local *local = nfc_llcp_find_local(dev); | |
1005 | ||
1006 | if (local == NULL) { | |
1007 | pr_debug("No such device\n"); | |
1008 | return; | |
1009 | } | |
1010 | ||
1011 | list_del(&local->list); | |
1012 | nfc_llcp_socket_release(local); | |
1013 | del_timer_sync(&local->link_timer); | |
1014 | skb_queue_purge(&local->tx_queue); | |
1015 | destroy_workqueue(local->tx_wq); | |
1016 | destroy_workqueue(local->rx_wq); | |
5b68a7ca | 1017 | kfree_skb(local->rx_pending); |
d646960f SO |
1018 | kfree(local); |
1019 | } | |
1020 | ||
1021 | int __init nfc_llcp_init(void) | |
1022 | { | |
1023 | INIT_LIST_HEAD(&llcp_devices); | |
1024 | ||
1025 | return nfc_llcp_sock_init(); | |
1026 | } | |
1027 | ||
1028 | void nfc_llcp_exit(void) | |
1029 | { | |
1030 | nfc_llcp_sock_exit(); | |
1031 | } |