blob: eb51864089ef31be6f5009f155e9bed809f40e9d [file] [log] [blame]
Samuel Ortizd6469602011-12-14 16:43:12 +01001/*
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
32static 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
46static 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
54static 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
63static u8 llcp_tlv_version(u8 *tlv)
64{
65 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
66}
67
68static u16 llcp_tlv_miux(u8 *tlv)
69{
70 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7f;
71}
72
73static u16 llcp_tlv_wks(u8 *tlv)
74{
75 return llcp_tlv16(tlv, LLCP_TLV_WKS);
76}
77
78static u16 llcp_tlv_lto(u8 *tlv)
79{
80 return llcp_tlv8(tlv, LLCP_TLV_LTO);
81}
82
83static u8 llcp_tlv_opt(u8 *tlv)
84{
85 return llcp_tlv8(tlv, LLCP_TLV_OPT);
86}
87
88static u8 llcp_tlv_rw(u8 *tlv)
89{
90 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
91}
92
93u8 *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;
Samuel Ortiz324b0af2012-04-10 19:43:15 +0200105 else if (length == 0)
Samuel Ortizd6469602011-12-14 16:43:12 +0100106 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
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200120int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
121 u8 *tlv_array, u16 tlv_array_len)
Samuel Ortizd6469602011-12-14 16:43:12 +0100122{
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;
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200152 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
169int 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) {
Samuel Ortizd6469602011-12-14 16:43:12 +0100186 case LLCP_TLV_RW:
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200187 sock->rw = llcp_tlv_rw(tlv);
Samuel Ortizd6469602011-12-14 16:43:12 +0100188 break;
Samuel Ortiz9dda50f2012-03-05 01:03:49 +0100189 case LLCP_TLV_SN:
190 break;
Samuel Ortizd6469602011-12-14 16:43:12 +0100191 default:
192 pr_err("Invalid gt tlv value 0x%x\n", type);
193 break;
194 }
195
196 offset += length + 2;
197 tlv += length + 2;
198 }
199
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200200 pr_debug("sock %p rw %d\n", sock, sock->rw);
Samuel Ortizd6469602011-12-14 16:43:12 +0100201
202 return 0;
203}
204
205static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100206 u8 dsap, u8 ssap, u8 ptype)
Samuel Ortizd6469602011-12-14 16:43:12 +0100207{
208 u8 header[2];
209
210 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
211
212 header[0] = (u8)((dsap << 2) | (ptype >> 2));
213 header[1] = (u8)((ptype << 6) | ssap);
214
215 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
216
217 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
218
219 return pdu;
220}
221
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100222static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
223 u8 tlv_length)
Samuel Ortizd6469602011-12-14 16:43:12 +0100224{
225 /* XXX Add an skb length check */
226
227 if (tlv == NULL)
228 return NULL;
229
230 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
231
232 return pdu;
233}
234
235static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100236 u8 cmd, u16 size)
Samuel Ortizd6469602011-12-14 16:43:12 +0100237{
238 struct sk_buff *skb;
239 int err;
240
241 if (sock->ssap == 0)
242 return NULL;
243
244 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100245 size + LLCP_HEADER_SIZE, &err);
Samuel Ortizd6469602011-12-14 16:43:12 +0100246 if (skb == NULL) {
247 pr_err("Could not allocate PDU\n");
248 return NULL;
249 }
250
251 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
252
253 return skb;
254}
255
256int nfc_llcp_disconnect(struct nfc_llcp_sock *sock)
257{
258 struct sk_buff *skb;
259 struct nfc_dev *dev;
260 struct nfc_llcp_local *local;
261 u16 size = 0;
262
263 pr_debug("Sending DISC\n");
264
265 local = sock->local;
266 if (local == NULL)
267 return -ENODEV;
268
269 dev = sock->dev;
270 if (dev == NULL)
271 return -ENODEV;
272
273 size += LLCP_HEADER_SIZE;
274 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
275
276 skb = alloc_skb(size, GFP_ATOMIC);
277 if (skb == NULL)
278 return -ENOMEM;
279
280 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
281
Samuel Ortizffc29312012-04-10 19:43:16 +0200282 skb = llcp_add_header(skb, sock->dsap, sock->ssap, LLCP_PDU_DISC);
Samuel Ortizd6469602011-12-14 16:43:12 +0100283
284 skb_queue_tail(&local->tx_queue, skb);
285
286 return 0;
287}
288
289int nfc_llcp_send_symm(struct nfc_dev *dev)
290{
291 struct sk_buff *skb;
292 struct nfc_llcp_local *local;
293 u16 size = 0;
294
295 pr_debug("Sending SYMM\n");
296
297 local = nfc_llcp_find_local(dev);
298 if (local == NULL)
299 return -ENODEV;
300
301 size += LLCP_HEADER_SIZE;
302 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
303
304 skb = alloc_skb(size, GFP_KERNEL);
305 if (skb == NULL)
306 return -ENOMEM;
307
308 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
309
310 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
311
312 return nfc_data_exchange(dev, local->target_idx, skb,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100313 nfc_llcp_recv, local);
Samuel Ortizd6469602011-12-14 16:43:12 +0100314}
315
316int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
317{
318 struct nfc_llcp_local *local;
319 struct sk_buff *skb;
320 u8 *service_name_tlv = NULL, service_name_tlv_length;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100321 u8 *miux_tlv = NULL, miux_tlv_length;
322 u8 *rw_tlv = NULL, rw_tlv_length, rw;
323 __be16 miux;
Samuel Ortizd6469602011-12-14 16:43:12 +0100324 int err;
325 u16 size = 0;
326
327 pr_debug("Sending CONNECT\n");
328
329 local = sock->local;
330 if (local == NULL)
331 return -ENODEV;
332
333 if (sock->service_name != NULL) {
334 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100335 sock->service_name,
336 sock->service_name_len,
337 &service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100338 size += service_name_tlv_length;
339 }
340
Samuel Ortizeda21f12012-03-05 01:03:43 +0100341 miux = cpu_to_be16(LLCP_MAX_MIUX);
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100342 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
343 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100344 size += miux_tlv_length;
345
346 rw = LLCP_MAX_RW;
347 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
348 size += rw_tlv_length;
349
Samuel Ortizd6469602011-12-14 16:43:12 +0100350 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
351
352 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
353 if (skb == NULL) {
354 err = -ENOMEM;
355 goto error_tlv;
356 }
357
358 if (service_name_tlv != NULL)
359 skb = llcp_add_tlv(skb, service_name_tlv,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100360 service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100361
Samuel Ortizeda21f12012-03-05 01:03:43 +0100362 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
363 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
364
Samuel Ortizd6469602011-12-14 16:43:12 +0100365 skb_queue_tail(&local->tx_queue, skb);
366
367 return 0;
368
369error_tlv:
370 pr_err("error %d\n", err);
371
372 kfree(service_name_tlv);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100373 kfree(miux_tlv);
374 kfree(rw_tlv);
Samuel Ortizd6469602011-12-14 16:43:12 +0100375
376 return err;
377}
378
379int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
380{
381 struct nfc_llcp_local *local;
382 struct sk_buff *skb;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100383 u8 *miux_tlv = NULL, miux_tlv_length;
384 u8 *rw_tlv = NULL, rw_tlv_length, rw;
385 __be16 miux;
386 int err;
387 u16 size = 0;
Samuel Ortizd6469602011-12-14 16:43:12 +0100388
389 pr_debug("Sending CC\n");
390
391 local = sock->local;
392 if (local == NULL)
393 return -ENODEV;
394
Samuel Ortizeda21f12012-03-05 01:03:43 +0100395 miux = cpu_to_be16(LLCP_MAX_MIUX);
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100396 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
397 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100398 size += miux_tlv_length;
399
400 rw = LLCP_MAX_RW;
401 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
402 size += rw_tlv_length;
403
404 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
405 if (skb == NULL) {
406 err = -ENOMEM;
407 goto error_tlv;
408 }
409
410 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
411 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100412
413 skb_queue_tail(&local->tx_queue, skb);
414
415 return 0;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100416
417error_tlv:
418 pr_err("error %d\n", err);
419
420 kfree(miux_tlv);
421 kfree(rw_tlv);
422
423 return err;
Samuel Ortizd6469602011-12-14 16:43:12 +0100424}
425
426int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
427{
428 struct sk_buff *skb;
429 struct nfc_dev *dev;
430 u16 size = 1; /* Reason code */
431
432 pr_debug("Sending DM reason 0x%x\n", reason);
433
434 if (local == NULL)
435 return -ENODEV;
436
437 dev = local->dev;
438 if (dev == NULL)
439 return -ENODEV;
440
441 size += LLCP_HEADER_SIZE;
442 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
443
444 skb = alloc_skb(size, GFP_KERNEL);
445 if (skb == NULL)
446 return -ENOMEM;
447
448 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
449
Samuel Ortizffc29312012-04-10 19:43:16 +0200450 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
Samuel Ortizd6469602011-12-14 16:43:12 +0100451
452 memcpy(skb_put(skb, 1), &reason, 1);
453
454 skb_queue_head(&local->tx_queue, skb);
455
456 return 0;
457}
458
459int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
460{
461 struct sk_buff *skb;
462 struct nfc_llcp_local *local;
463
464 pr_debug("Send DISC\n");
465
466 local = sock->local;
467 if (local == NULL)
468 return -ENODEV;
469
470 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
471 if (skb == NULL)
472 return -ENOMEM;
473
474 skb_queue_head(&local->tx_queue, skb);
475
476 return 0;
477}
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100478
479int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100480 struct msghdr *msg, size_t len)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100481{
482 struct sk_buff *pdu;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100483 struct sock *sk = &sock->sk;
484 struct nfc_llcp_local *local;
485 size_t frag_len = 0, remaining_len;
486 u8 *msg_data, *msg_ptr;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100487
Samuel Ortize65b0f42012-03-05 01:03:44 +0100488 pr_debug("Send I frame len %zd\n", len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100489
Samuel Ortize65b0f42012-03-05 01:03:44 +0100490 local = sock->local;
491 if (local == NULL)
492 return -ENODEV;
493
494 msg_data = kzalloc(len, GFP_KERNEL);
495 if (msg_data == NULL)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100496 return -ENOMEM;
497
Samuel Ortize65b0f42012-03-05 01:03:44 +0100498 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100499 kfree(msg_data);
500 return -EFAULT;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100501 }
502
Samuel Ortize65b0f42012-03-05 01:03:44 +0100503 remaining_len = len;
504 msg_ptr = msg_data;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100505
Samuel Ortize65b0f42012-03-05 01:03:44 +0100506 while (remaining_len > 0) {
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100507
Samuel Ortizb4838d12012-04-10 19:43:03 +0200508 frag_len = min_t(size_t, local->remote_miu, remaining_len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100509
Samuel Ortize65b0f42012-03-05 01:03:44 +0100510 pr_debug("Fragment %zd bytes remaining %zd",
511 frag_len, remaining_len);
512
513 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
514 frag_len + LLCP_SEQUENCE_SIZE);
515 if (pdu == NULL)
516 return -ENOMEM;
517
518 skb_put(pdu, LLCP_SEQUENCE_SIZE);
519
520 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
521
Samuel Ortizbdbc59b2012-05-10 19:45:52 +0200522 skb_queue_tail(&sock->tx_queue, pdu);
Samuel Ortize65b0f42012-03-05 01:03:44 +0100523
524 lock_sock(sk);
525
526 nfc_llcp_queue_i_frames(sock);
527
528 release_sock(sk);
529
530 remaining_len -= frag_len;
Samuel Ortizb4838d12012-04-10 19:43:03 +0200531 msg_ptr += frag_len;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100532 }
533
534 kfree(msg_data);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100535
Samuel Ortiz43472ff2012-05-07 12:31:21 +0200536 return len;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100537}
Samuel Ortizd094afa2012-03-05 01:03:42 +0100538
539int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
540{
541 struct sk_buff *skb;
542 struct nfc_llcp_local *local;
543
544 pr_debug("Send rr nr %d\n", sock->recv_n);
545
546 local = sock->local;
547 if (local == NULL)
548 return -ENODEV;
549
550 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
551 if (skb == NULL)
552 return -ENOMEM;
553
554 skb_put(skb, LLCP_SEQUENCE_SIZE);
555
Samuel Ortiz279cf172012-04-10 19:43:14 +0200556 skb->data[2] = sock->recv_n;
Samuel Ortizd094afa2012-03-05 01:03:42 +0100557
558 skb_queue_head(&local->tx_queue, skb);
559
560 return 0;
561}