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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/module.h> | |
25 | #include <linux/nfc.h> | |
26 | ||
27 | #include <net/nfc/nfc.h> | |
28 | ||
29 | #include "../nfc.h" | |
30 | #include "llcp.h" | |
31 | ||
32 | static u8 llcp_tlv_length[LLCP_TLV_MAX] = { | |
33 | 0, | |
34 | 1, /* VERSION */ | |
35 | 2, /* MIUX */ | |
36 | 2, /* WKS */ | |
37 | 1, /* LTO */ | |
38 | 1, /* RW */ | |
39 | 0, /* SN */ | |
40 | 1, /* OPT */ | |
41 | 0, /* SDREQ */ | |
42 | 2, /* SDRES */ | |
43 | ||
44 | }; | |
45 | ||
46 | static u8 llcp_tlv8(u8 *tlv, u8 type) | |
47 | { | |
48 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
49 | return 0; | |
50 | ||
51 | return tlv[2]; | |
52 | } | |
53 | ||
54 | static u8 llcp_tlv16(u8 *tlv, u8 type) | |
55 | { | |
56 | if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]]) | |
57 | return 0; | |
58 | ||
59 | return be16_to_cpu(*((__be16 *)(tlv + 2))); | |
60 | } | |
61 | ||
62 | ||
63 | static u8 llcp_tlv_version(u8 *tlv) | |
64 | { | |
65 | return llcp_tlv8(tlv, LLCP_TLV_VERSION); | |
66 | } | |
67 | ||
68 | static u16 llcp_tlv_miux(u8 *tlv) | |
69 | { | |
70 | return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f; | |
71 | } | |
72 | ||
73 | static u16 llcp_tlv_wks(u8 *tlv) | |
74 | { | |
75 | return llcp_tlv16(tlv, LLCP_TLV_WKS); | |
76 | } | |
77 | ||
78 | static u16 llcp_tlv_lto(u8 *tlv) | |
79 | { | |
80 | return llcp_tlv8(tlv, LLCP_TLV_LTO); | |
81 | } | |
82 | ||
83 | static u8 llcp_tlv_opt(u8 *tlv) | |
84 | { | |
85 | return llcp_tlv8(tlv, LLCP_TLV_OPT); | |
86 | } | |
87 | ||
88 | static u8 llcp_tlv_rw(u8 *tlv) | |
89 | { | |
90 | return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf; | |
91 | } | |
92 | ||
93 | u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length) | |
94 | { | |
95 | u8 *tlv, length; | |
96 | ||
97 | pr_debug("type %d\n", type); | |
98 | ||
99 | if (type >= LLCP_TLV_MAX) | |
100 | return NULL; | |
101 | ||
102 | length = llcp_tlv_length[type]; | |
103 | if (length == 0 && value_length == 0) | |
104 | return NULL; | |
105 | else | |
106 | length = value_length; | |
107 | ||
108 | *tlv_length = 2 + length; | |
109 | tlv = kzalloc(2 + length, GFP_KERNEL); | |
110 | if (tlv == NULL) | |
111 | return tlv; | |
112 | ||
113 | tlv[0] = type; | |
114 | tlv[1] = length; | |
115 | memcpy(tlv + 2, value, length); | |
116 | ||
117 | return tlv; | |
118 | } | |
119 | ||
120 | int nfc_llcp_parse_tlv(struct nfc_llcp_local *local, | |
121 | u8 *tlv_array, u16 tlv_array_len) | |
122 | { | |
123 | u8 *tlv = tlv_array, type, length, offset = 0; | |
124 | ||
125 | pr_debug("TLV array length %d\n", tlv_array_len); | |
126 | ||
127 | if (local == NULL) | |
128 | return -ENODEV; | |
129 | ||
130 | while (offset < tlv_array_len) { | |
131 | type = tlv[0]; | |
132 | length = tlv[1]; | |
133 | ||
134 | pr_debug("type 0x%x length %d\n", type, length); | |
135 | ||
136 | switch (type) { | |
137 | case LLCP_TLV_VERSION: | |
138 | local->remote_version = llcp_tlv_version(tlv); | |
139 | break; | |
140 | case LLCP_TLV_MIUX: | |
141 | local->remote_miu = llcp_tlv_miux(tlv) + 128; | |
142 | break; | |
143 | case LLCP_TLV_WKS: | |
144 | local->remote_wks = llcp_tlv_wks(tlv); | |
145 | break; | |
146 | case LLCP_TLV_LTO: | |
147 | local->remote_lto = llcp_tlv_lto(tlv) * 10; | |
148 | break; | |
149 | case LLCP_TLV_OPT: | |
150 | local->remote_opt = llcp_tlv_opt(tlv); | |
151 | break; | |
152 | case LLCP_TLV_RW: | |
153 | local->remote_rw = llcp_tlv_rw(tlv); | |
154 | break; | |
9dda50f4 SO |
155 | case LLCP_TLV_SN: |
156 | break; | |
d646960f SO |
157 | default: |
158 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
159 | break; | |
160 | } | |
161 | ||
162 | offset += length + 2; | |
163 | tlv += length + 2; | |
164 | } | |
165 | ||
166 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x rw %d\n", | |
167 | local->remote_version, local->remote_miu, | |
168 | local->remote_lto, local->remote_opt, | |
169 | local->remote_wks, local->remote_rw); | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
175 | u8 dsap, u8 ssap, u8 ptype) | |
176 | { | |
177 | u8 header[2]; | |
178 | ||
179 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
180 | ||
181 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
182 | header[1] = (u8)((ptype << 6) | ssap); | |
183 | ||
184 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
185 | ||
186 | memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE); | |
187 | ||
188 | return pdu; | |
189 | } | |
190 | ||
191 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, u8 tlv_length) | |
192 | { | |
193 | /* XXX Add an skb length check */ | |
194 | ||
195 | if (tlv == NULL) | |
196 | return NULL; | |
197 | ||
198 | memcpy(skb_put(pdu, tlv_length), tlv, tlv_length); | |
199 | ||
200 | return pdu; | |
201 | } | |
202 | ||
203 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
204 | u8 cmd, u16 size) | |
205 | { | |
206 | struct sk_buff *skb; | |
207 | int err; | |
208 | ||
209 | if (sock->ssap == 0) | |
210 | return NULL; | |
211 | ||
212 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
213 | size + LLCP_HEADER_SIZE, &err); | |
214 | if (skb == NULL) { | |
215 | pr_err("Could not allocate PDU\n"); | |
216 | return NULL; | |
217 | } | |
218 | ||
219 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
220 | ||
221 | return skb; | |
222 | } | |
223 | ||
224 | int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) | |
225 | { | |
226 | struct sk_buff *skb; | |
227 | struct nfc_dev *dev; | |
228 | struct nfc_llcp_local *local; | |
229 | u16 size = 0; | |
230 | ||
231 | pr_debug("Sending DISC\n"); | |
232 | ||
233 | local = sock->local; | |
234 | if (local == NULL) | |
235 | return -ENODEV; | |
236 | ||
237 | dev = sock->dev; | |
238 | if (dev == NULL) | |
239 | return -ENODEV; | |
240 | ||
241 | size += LLCP_HEADER_SIZE; | |
242 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
243 | ||
244 | skb = alloc_skb(size, GFP_ATOMIC); | |
245 | if (skb == NULL) | |
246 | return -ENOMEM; | |
247 | ||
248 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
249 | ||
250 | skb = llcp_add_header(skb, sock->ssap, sock->dsap, LLCP_PDU_DISC); | |
251 | ||
252 | skb_queue_tail(&local->tx_queue, skb); | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
258 | { | |
259 | struct sk_buff *skb; | |
260 | struct nfc_llcp_local *local; | |
261 | u16 size = 0; | |
262 | ||
263 | pr_debug("Sending SYMM\n"); | |
264 | ||
265 | local = nfc_llcp_find_local(dev); | |
266 | if (local == NULL) | |
267 | return -ENODEV; | |
268 | ||
269 | size += LLCP_HEADER_SIZE; | |
270 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
271 | ||
272 | skb = alloc_skb(size, GFP_KERNEL); | |
273 | if (skb == NULL) | |
274 | return -ENOMEM; | |
275 | ||
276 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
277 | ||
278 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
279 | ||
280 | return nfc_data_exchange(dev, local->target_idx, skb, | |
281 | nfc_llcp_recv, local); | |
282 | } | |
283 | ||
284 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) | |
285 | { | |
286 | struct nfc_llcp_local *local; | |
287 | struct sk_buff *skb; | |
288 | u8 *service_name_tlv = NULL, service_name_tlv_length; | |
eda21f16 SO |
289 | u8 *miux_tlv = NULL, miux_tlv_length; |
290 | u8 *rw_tlv = NULL, rw_tlv_length, rw; | |
291 | __be16 miux; | |
d646960f SO |
292 | int err; |
293 | u16 size = 0; | |
294 | ||
295 | pr_debug("Sending CONNECT\n"); | |
296 | ||
297 | local = sock->local; | |
298 | if (local == NULL) | |
299 | return -ENODEV; | |
300 | ||
301 | if (sock->service_name != NULL) { | |
302 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
303 | sock->service_name, | |
304 | sock->service_name_len, | |
305 | &service_name_tlv_length); | |
306 | size += service_name_tlv_length; | |
307 | } | |
308 | ||
eda21f16 SO |
309 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
310 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, &miux_tlv_length); | |
311 | size += miux_tlv_length; | |
312 | ||
313 | rw = LLCP_MAX_RW; | |
314 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); | |
315 | size += rw_tlv_length; | |
316 | ||
d646960f SO |
317 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
318 | ||
319 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
320 | if (skb == NULL) { | |
321 | err = -ENOMEM; | |
322 | goto error_tlv; | |
323 | } | |
324 | ||
325 | if (service_name_tlv != NULL) | |
326 | skb = llcp_add_tlv(skb, service_name_tlv, | |
327 | service_name_tlv_length); | |
328 | ||
eda21f16 SO |
329 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
330 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
331 | ||
d646960f SO |
332 | skb_queue_tail(&local->tx_queue, skb); |
333 | ||
334 | return 0; | |
335 | ||
336 | error_tlv: | |
337 | pr_err("error %d\n", err); | |
338 | ||
339 | kfree(service_name_tlv); | |
eda21f16 SO |
340 | kfree(miux_tlv); |
341 | kfree(rw_tlv); | |
d646960f SO |
342 | |
343 | return err; | |
344 | } | |
345 | ||
346 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
347 | { | |
348 | struct nfc_llcp_local *local; | |
349 | struct sk_buff *skb; | |
eda21f16 SO |
350 | u8 *miux_tlv = NULL, miux_tlv_length; |
351 | u8 *rw_tlv = NULL, rw_tlv_length, rw; | |
352 | __be16 miux; | |
353 | int err; | |
354 | u16 size = 0; | |
d646960f SO |
355 | |
356 | pr_debug("Sending CC\n"); | |
357 | ||
358 | local = sock->local; | |
359 | if (local == NULL) | |
360 | return -ENODEV; | |
361 | ||
eda21f16 SO |
362 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
363 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, &miux_tlv_length); | |
364 | size += miux_tlv_length; | |
365 | ||
366 | rw = LLCP_MAX_RW; | |
367 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); | |
368 | size += rw_tlv_length; | |
369 | ||
370 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
371 | if (skb == NULL) { | |
372 | err = -ENOMEM; | |
373 | goto error_tlv; | |
374 | } | |
375 | ||
376 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
377 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
378 | |
379 | skb_queue_tail(&local->tx_queue, skb); | |
380 | ||
381 | return 0; | |
eda21f16 SO |
382 | |
383 | error_tlv: | |
384 | pr_err("error %d\n", err); | |
385 | ||
386 | kfree(miux_tlv); | |
387 | kfree(rw_tlv); | |
388 | ||
389 | return err; | |
d646960f SO |
390 | } |
391 | ||
392 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) | |
393 | { | |
394 | struct sk_buff *skb; | |
395 | struct nfc_dev *dev; | |
396 | u16 size = 1; /* Reason code */ | |
397 | ||
398 | pr_debug("Sending DM reason 0x%x\n", reason); | |
399 | ||
400 | if (local == NULL) | |
401 | return -ENODEV; | |
402 | ||
403 | dev = local->dev; | |
404 | if (dev == NULL) | |
405 | return -ENODEV; | |
406 | ||
407 | size += LLCP_HEADER_SIZE; | |
408 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
409 | ||
410 | skb = alloc_skb(size, GFP_KERNEL); | |
411 | if (skb == NULL) | |
412 | return -ENOMEM; | |
413 | ||
414 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
415 | ||
416 | skb = llcp_add_header(skb, ssap, dsap, LLCP_PDU_DM); | |
417 | ||
418 | memcpy(skb_put(skb, 1), &reason, 1); | |
419 | ||
420 | skb_queue_head(&local->tx_queue, skb); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) | |
426 | { | |
427 | struct sk_buff *skb; | |
428 | struct nfc_llcp_local *local; | |
429 | ||
430 | pr_debug("Send DISC\n"); | |
431 | ||
432 | local = sock->local; | |
433 | if (local == NULL) | |
434 | return -ENODEV; | |
435 | ||
436 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); | |
437 | if (skb == NULL) | |
438 | return -ENOMEM; | |
439 | ||
440 | skb_queue_head(&local->tx_queue, skb); | |
441 | ||
442 | return 0; | |
443 | } | |
53a0ac2e SO |
444 | |
445 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, | |
446 | struct msghdr *msg, size_t len) | |
447 | { | |
448 | struct sk_buff *pdu; | |
e65b0f46 SO |
449 | struct sock *sk = &sock->sk; |
450 | struct nfc_llcp_local *local; | |
451 | size_t frag_len = 0, remaining_len; | |
452 | u8 *msg_data, *msg_ptr; | |
53a0ac2e | 453 | |
e65b0f46 | 454 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 455 | |
e65b0f46 SO |
456 | local = sock->local; |
457 | if (local == NULL) | |
458 | return -ENODEV; | |
53a0ac2e | 459 | |
e65b0f46 SO |
460 | msg_data = kzalloc(len, GFP_KERNEL); |
461 | if (msg_data == NULL) | |
462 | return -ENOMEM; | |
53a0ac2e | 463 | |
e65b0f46 SO |
464 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
465 | kfree(msg_data); | |
466 | return -EFAULT; | |
53a0ac2e SO |
467 | } |
468 | ||
e65b0f46 SO |
469 | remaining_len = len; |
470 | msg_ptr = msg_data; | |
471 | ||
472 | while (remaining_len > 0) { | |
473 | ||
474 | frag_len = min_t(u16, local->remote_miu, remaining_len); | |
53a0ac2e | 475 | |
e65b0f46 SO |
476 | pr_debug("Fragment %zd bytes remaining %zd", |
477 | frag_len, remaining_len); | |
53a0ac2e | 478 | |
e65b0f46 SO |
479 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
480 | frag_len + LLCP_SEQUENCE_SIZE); | |
481 | if (pdu == NULL) | |
482 | return -ENOMEM; | |
483 | ||
484 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
485 | ||
486 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
487 | ||
488 | skb_queue_head(&sock->tx_queue, pdu); | |
489 | ||
490 | lock_sock(sk); | |
491 | ||
492 | nfc_llcp_queue_i_frames(sock); | |
493 | ||
494 | release_sock(sk); | |
495 | ||
496 | remaining_len -= frag_len; | |
497 | msg_ptr += len; | |
498 | } | |
53a0ac2e | 499 | |
e65b0f46 | 500 | kfree(msg_data); |
53a0ac2e SO |
501 | |
502 | return 0; | |
503 | } | |
d094afa1 SO |
504 | |
505 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) | |
506 | { | |
507 | struct sk_buff *skb; | |
508 | struct nfc_llcp_local *local; | |
509 | ||
510 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
511 | ||
512 | local = sock->local; | |
513 | if (local == NULL) | |
514 | return -ENODEV; | |
515 | ||
516 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
517 | if (skb == NULL) | |
518 | return -ENOMEM; | |
519 | ||
520 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
521 | ||
522 | skb->data[2] = sock->recv_n % 16; | |
523 | ||
524 | skb_queue_head(&local->tx_queue, skb); | |
525 | ||
526 | return 0; | |
527 | } |