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