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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 | ||
76762b73 | 54 | static u16 llcp_tlv16(u8 *tlv, u8 type) |
d646960f SO |
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 | { | |
76762b73 | 70 | return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff; |
d646960f SO |
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; | |
324b0af6 | 105 | else if (length == 0) |
d646960f SO |
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 | ||
7a06e586 SO |
120 | int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local, |
121 | u8 *tlv_array, u16 tlv_array_len) | |
d646960f SO |
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; | |
7a06e586 SO |
152 | default: |
153 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
154 | break; | |
155 | } | |
156 | ||
157 | offset += length + 2; | |
158 | tlv += length + 2; | |
159 | } | |
160 | ||
161 | pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n", | |
162 | local->remote_version, local->remote_miu, | |
163 | local->remote_lto, local->remote_opt, | |
164 | local->remote_wks); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock, | |
170 | u8 *tlv_array, u16 tlv_array_len) | |
171 | { | |
172 | u8 *tlv = tlv_array, type, length, offset = 0; | |
173 | ||
174 | pr_debug("TLV array length %d\n", tlv_array_len); | |
175 | ||
176 | if (sock == NULL) | |
177 | return -ENOTCONN; | |
178 | ||
179 | while (offset < tlv_array_len) { | |
180 | type = tlv[0]; | |
181 | length = tlv[1]; | |
182 | ||
183 | pr_debug("type 0x%x length %d\n", type, length); | |
184 | ||
185 | switch (type) { | |
93d7e490 SO |
186 | case LLCP_TLV_MIUX: |
187 | sock->miu = llcp_tlv_miux(tlv) + 128; | |
188 | break; | |
d646960f | 189 | case LLCP_TLV_RW: |
7a06e586 | 190 | sock->rw = llcp_tlv_rw(tlv); |
d646960f | 191 | break; |
9dda50f4 SO |
192 | case LLCP_TLV_SN: |
193 | break; | |
d646960f SO |
194 | default: |
195 | pr_err("Invalid gt tlv value 0x%x\n", type); | |
196 | break; | |
197 | } | |
198 | ||
199 | offset += length + 2; | |
200 | tlv += length + 2; | |
201 | } | |
202 | ||
93d7e490 | 203 | pr_debug("sock %p rw %d miu %d\n", sock, sock->rw, sock->miu); |
d646960f SO |
204 | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
427a2eb1 | 209 | u8 dsap, u8 ssap, u8 ptype) |
d646960f SO |
210 | { |
211 | u8 header[2]; | |
212 | ||
213 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
214 | ||
215 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
216 | header[1] = (u8)((ptype << 6) | ssap); | |
217 | ||
218 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
219 | ||
220 | memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE); | |
221 | ||
222 | return pdu; | |
223 | } | |
224 | ||
427a2eb1 SO |
225 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, |
226 | u8 tlv_length) | |
d646960f SO |
227 | { |
228 | /* XXX Add an skb length check */ | |
229 | ||
230 | if (tlv == NULL) | |
231 | return NULL; | |
232 | ||
233 | memcpy(skb_put(pdu, tlv_length), tlv, tlv_length); | |
234 | ||
235 | return pdu; | |
236 | } | |
237 | ||
238 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
427a2eb1 | 239 | u8 cmd, u16 size) |
d646960f SO |
240 | { |
241 | struct sk_buff *skb; | |
242 | int err; | |
243 | ||
244 | if (sock->ssap == 0) | |
245 | return NULL; | |
246 | ||
247 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
427a2eb1 | 248 | size + LLCP_HEADER_SIZE, &err); |
d646960f SO |
249 | if (skb == NULL) { |
250 | pr_err("Could not allocate PDU\n"); | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
255 | ||
256 | return skb; | |
257 | } | |
258 | ||
259 | int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) | |
260 | { | |
261 | struct sk_buff *skb; | |
262 | struct nfc_dev *dev; | |
263 | struct nfc_llcp_local *local; | |
d646960f SO |
264 | |
265 | pr_debug("Sending DISC\n"); | |
266 | ||
267 | local = sock->local; | |
268 | if (local == NULL) | |
269 | return -ENODEV; | |
270 | ||
271 | dev = sock->dev; | |
272 | if (dev == NULL) | |
273 | return -ENODEV; | |
274 | ||
92223906 | 275 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
d646960f SO |
276 | if (skb == NULL) |
277 | return -ENOMEM; | |
278 | ||
d646960f SO |
279 | skb_queue_tail(&local->tx_queue, skb); |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
285 | { | |
286 | struct sk_buff *skb; | |
287 | struct nfc_llcp_local *local; | |
288 | u16 size = 0; | |
289 | ||
290 | pr_debug("Sending SYMM\n"); | |
291 | ||
292 | local = nfc_llcp_find_local(dev); | |
293 | if (local == NULL) | |
294 | return -ENODEV; | |
295 | ||
296 | size += LLCP_HEADER_SIZE; | |
297 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
298 | ||
299 | skb = alloc_skb(size, GFP_KERNEL); | |
300 | if (skb == NULL) | |
301 | return -ENOMEM; | |
302 | ||
303 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
304 | ||
305 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
306 | ||
4463523b TE |
307 | nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX); |
308 | ||
d646960f | 309 | return nfc_data_exchange(dev, local->target_idx, skb, |
427a2eb1 | 310 | nfc_llcp_recv, local); |
d646960f SO |
311 | } |
312 | ||
313 | int nfc_llcp_send_connect(struct nfc_llcp_sock *sock) | |
314 | { | |
315 | struct nfc_llcp_local *local; | |
316 | struct sk_buff *skb; | |
317 | u8 *service_name_tlv = NULL, service_name_tlv_length; | |
eda21f16 SO |
318 | u8 *miux_tlv = NULL, miux_tlv_length; |
319 | u8 *rw_tlv = NULL, rw_tlv_length, rw; | |
320 | __be16 miux; | |
d646960f SO |
321 | int err; |
322 | u16 size = 0; | |
323 | ||
324 | pr_debug("Sending CONNECT\n"); | |
325 | ||
326 | local = sock->local; | |
327 | if (local == NULL) | |
328 | return -ENODEV; | |
329 | ||
330 | if (sock->service_name != NULL) { | |
331 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
427a2eb1 SO |
332 | sock->service_name, |
333 | sock->service_name_len, | |
334 | &service_name_tlv_length); | |
d646960f SO |
335 | size += service_name_tlv_length; |
336 | } | |
337 | ||
eda21f16 | 338 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
427a2eb1 SO |
339 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
340 | &miux_tlv_length); | |
eda21f16 SO |
341 | size += miux_tlv_length; |
342 | ||
343 | rw = LLCP_MAX_RW; | |
344 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); | |
345 | size += rw_tlv_length; | |
346 | ||
d646960f SO |
347 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
348 | ||
349 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
350 | if (skb == NULL) { | |
351 | err = -ENOMEM; | |
352 | goto error_tlv; | |
353 | } | |
354 | ||
355 | if (service_name_tlv != NULL) | |
356 | skb = llcp_add_tlv(skb, service_name_tlv, | |
427a2eb1 | 357 | service_name_tlv_length); |
d646960f | 358 | |
eda21f16 SO |
359 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
360 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
361 | ||
d646960f SO |
362 | skb_queue_tail(&local->tx_queue, skb); |
363 | ||
364 | return 0; | |
365 | ||
366 | error_tlv: | |
367 | pr_err("error %d\n", err); | |
368 | ||
369 | kfree(service_name_tlv); | |
eda21f16 SO |
370 | kfree(miux_tlv); |
371 | kfree(rw_tlv); | |
d646960f SO |
372 | |
373 | return err; | |
374 | } | |
375 | ||
376 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
377 | { | |
378 | struct nfc_llcp_local *local; | |
379 | struct sk_buff *skb; | |
eda21f16 SO |
380 | u8 *miux_tlv = NULL, miux_tlv_length; |
381 | u8 *rw_tlv = NULL, rw_tlv_length, rw; | |
382 | __be16 miux; | |
383 | int err; | |
384 | u16 size = 0; | |
d646960f SO |
385 | |
386 | pr_debug("Sending CC\n"); | |
387 | ||
388 | local = sock->local; | |
389 | if (local == NULL) | |
390 | return -ENODEV; | |
391 | ||
eda21f16 | 392 | miux = cpu_to_be16(LLCP_MAX_MIUX); |
427a2eb1 SO |
393 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0, |
394 | &miux_tlv_length); | |
eda21f16 SO |
395 | size += miux_tlv_length; |
396 | ||
397 | rw = LLCP_MAX_RW; | |
398 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length); | |
399 | size += rw_tlv_length; | |
400 | ||
401 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
402 | if (skb == NULL) { | |
403 | err = -ENOMEM; | |
404 | goto error_tlv; | |
405 | } | |
406 | ||
407 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
408 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
409 | |
410 | skb_queue_tail(&local->tx_queue, skb); | |
411 | ||
412 | return 0; | |
eda21f16 SO |
413 | |
414 | error_tlv: | |
415 | pr_err("error %d\n", err); | |
416 | ||
417 | kfree(miux_tlv); | |
418 | kfree(rw_tlv); | |
419 | ||
420 | return err; | |
d646960f SO |
421 | } |
422 | ||
423 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) | |
424 | { | |
425 | struct sk_buff *skb; | |
426 | struct nfc_dev *dev; | |
427 | u16 size = 1; /* Reason code */ | |
428 | ||
429 | pr_debug("Sending DM reason 0x%x\n", reason); | |
430 | ||
431 | if (local == NULL) | |
432 | return -ENODEV; | |
433 | ||
434 | dev = local->dev; | |
435 | if (dev == NULL) | |
436 | return -ENODEV; | |
437 | ||
438 | size += LLCP_HEADER_SIZE; | |
439 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
440 | ||
441 | skb = alloc_skb(size, GFP_KERNEL); | |
442 | if (skb == NULL) | |
443 | return -ENOMEM; | |
444 | ||
445 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
446 | ||
ffc29315 | 447 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f SO |
448 | |
449 | memcpy(skb_put(skb, 1), &reason, 1); | |
450 | ||
451 | skb_queue_head(&local->tx_queue, skb); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) | |
457 | { | |
458 | struct sk_buff *skb; | |
459 | struct nfc_llcp_local *local; | |
460 | ||
461 | pr_debug("Send DISC\n"); | |
462 | ||
463 | local = sock->local; | |
464 | if (local == NULL) | |
465 | return -ENODEV; | |
466 | ||
467 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); | |
468 | if (skb == NULL) | |
469 | return -ENOMEM; | |
470 | ||
471 | skb_queue_head(&local->tx_queue, skb); | |
472 | ||
473 | return 0; | |
474 | } | |
53a0ac2e SO |
475 | |
476 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, | |
427a2eb1 | 477 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
478 | { |
479 | struct sk_buff *pdu; | |
e65b0f46 SO |
480 | struct sock *sk = &sock->sk; |
481 | struct nfc_llcp_local *local; | |
482 | size_t frag_len = 0, remaining_len; | |
483 | u8 *msg_data, *msg_ptr; | |
53a0ac2e | 484 | |
e65b0f46 | 485 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 486 | |
e65b0f46 SO |
487 | local = sock->local; |
488 | if (local == NULL) | |
489 | return -ENODEV; | |
53a0ac2e | 490 | |
e65b0f46 SO |
491 | msg_data = kzalloc(len, GFP_KERNEL); |
492 | if (msg_data == NULL) | |
493 | return -ENOMEM; | |
53a0ac2e | 494 | |
e65b0f46 | 495 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
427a2eb1 SO |
496 | kfree(msg_data); |
497 | return -EFAULT; | |
53a0ac2e SO |
498 | } |
499 | ||
e65b0f46 SO |
500 | remaining_len = len; |
501 | msg_ptr = msg_data; | |
502 | ||
503 | while (remaining_len > 0) { | |
504 | ||
93d7e490 | 505 | frag_len = min_t(size_t, sock->miu, remaining_len); |
53a0ac2e | 506 | |
e65b0f46 SO |
507 | pr_debug("Fragment %zd bytes remaining %zd", |
508 | frag_len, remaining_len); | |
53a0ac2e | 509 | |
e65b0f46 SO |
510 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
511 | frag_len + LLCP_SEQUENCE_SIZE); | |
512 | if (pdu == NULL) | |
513 | return -ENOMEM; | |
514 | ||
515 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
516 | ||
517 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
518 | ||
bdbc59b3 | 519 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
520 | |
521 | lock_sock(sk); | |
522 | ||
523 | nfc_llcp_queue_i_frames(sock); | |
524 | ||
525 | release_sock(sk); | |
526 | ||
527 | remaining_len -= frag_len; | |
b4838d12 | 528 | msg_ptr += frag_len; |
e65b0f46 | 529 | } |
53a0ac2e | 530 | |
e65b0f46 | 531 | kfree(msg_data); |
53a0ac2e | 532 | |
43472fff | 533 | return len; |
53a0ac2e | 534 | } |
d094afa1 SO |
535 | |
536 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) | |
537 | { | |
538 | struct sk_buff *skb; | |
539 | struct nfc_llcp_local *local; | |
540 | ||
541 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
542 | ||
543 | local = sock->local; | |
544 | if (local == NULL) | |
545 | return -ENODEV; | |
546 | ||
547 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
548 | if (skb == NULL) | |
549 | return -ENOMEM; | |
550 | ||
551 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
552 | ||
279cf174 | 553 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
554 | |
555 | skb_queue_head(&local->tx_queue, skb); | |
556 | ||
557 | return 0; | |
558 | } |