blob: 850e5cf79378b69050646a6b3176620a2603b7c5 [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 Ortiz93d7e492012-05-14 17:37:32 +0200186 case LLCP_TLV_MIUX:
187 sock->miu = llcp_tlv_miux(tlv) + 128;
188 break;
Samuel Ortizd6469602011-12-14 16:43:12 +0100189 case LLCP_TLV_RW:
Samuel Ortiz7a06e582012-05-07 22:03:34 +0200190 sock->rw = llcp_tlv_rw(tlv);
Samuel Ortizd6469602011-12-14 16:43:12 +0100191 break;
Samuel Ortiz9dda50f2012-03-05 01:03:49 +0100192 case LLCP_TLV_SN:
193 break;
Samuel Ortizd6469602011-12-14 16:43:12 +0100194 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
Samuel Ortiz93d7e492012-05-14 17:37:32 +0200203 pr_debug("sock %p rw %d miu %d\n", sock, sock->rw, sock->miu);
Samuel Ortizd6469602011-12-14 16:43:12 +0100204
205 return 0;
206}
207
208static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100209 u8 dsap, u8 ssap, u8 ptype)
Samuel Ortizd6469602011-12-14 16:43:12 +0100210{
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
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100225static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
226 u8 tlv_length)
Samuel Ortizd6469602011-12-14 16:43:12 +0100227{
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
238static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100239 u8 cmd, u16 size)
Samuel Ortizd6469602011-12-14 16:43:12 +0100240{
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,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100248 size + LLCP_HEADER_SIZE, &err);
Samuel Ortizd6469602011-12-14 16:43:12 +0100249 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
259int 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;
264 u16 size = 0;
265
266 pr_debug("Sending DISC\n");
267
268 local = sock->local;
269 if (local == NULL)
270 return -ENODEV;
271
272 dev = sock->dev;
273 if (dev == NULL)
274 return -ENODEV;
275
276 size += LLCP_HEADER_SIZE;
277 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
278
279 skb = alloc_skb(size, GFP_ATOMIC);
280 if (skb == NULL)
281 return -ENOMEM;
282
283 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
284
Samuel Ortizffc29312012-04-10 19:43:16 +0200285 skb = llcp_add_header(skb, sock->dsap, sock->ssap, LLCP_PDU_DISC);
Samuel Ortizd6469602011-12-14 16:43:12 +0100286
287 skb_queue_tail(&local->tx_queue, skb);
288
289 return 0;
290}
291
292int nfc_llcp_send_symm(struct nfc_dev *dev)
293{
294 struct sk_buff *skb;
295 struct nfc_llcp_local *local;
296 u16 size = 0;
297
298 pr_debug("Sending SYMM\n");
299
300 local = nfc_llcp_find_local(dev);
301 if (local == NULL)
302 return -ENODEV;
303
304 size += LLCP_HEADER_SIZE;
305 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
306
307 skb = alloc_skb(size, GFP_KERNEL);
308 if (skb == NULL)
309 return -ENOMEM;
310
311 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
312
313 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
314
315 return nfc_data_exchange(dev, local->target_idx, skb,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100316 nfc_llcp_recv, local);
Samuel Ortizd6469602011-12-14 16:43:12 +0100317}
318
319int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
320{
321 struct nfc_llcp_local *local;
322 struct sk_buff *skb;
323 u8 *service_name_tlv = NULL, service_name_tlv_length;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100324 u8 *miux_tlv = NULL, miux_tlv_length;
325 u8 *rw_tlv = NULL, rw_tlv_length, rw;
326 __be16 miux;
Samuel Ortizd6469602011-12-14 16:43:12 +0100327 int err;
328 u16 size = 0;
329
330 pr_debug("Sending CONNECT\n");
331
332 local = sock->local;
333 if (local == NULL)
334 return -ENODEV;
335
336 if (sock->service_name != NULL) {
337 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100338 sock->service_name,
339 sock->service_name_len,
340 &service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100341 size += service_name_tlv_length;
342 }
343
Samuel Ortizeda21f12012-03-05 01:03:43 +0100344 miux = cpu_to_be16(LLCP_MAX_MIUX);
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100345 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
346 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100347 size += miux_tlv_length;
348
349 rw = LLCP_MAX_RW;
350 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
351 size += rw_tlv_length;
352
Samuel Ortizd6469602011-12-14 16:43:12 +0100353 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
354
355 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
356 if (skb == NULL) {
357 err = -ENOMEM;
358 goto error_tlv;
359 }
360
361 if (service_name_tlv != NULL)
362 skb = llcp_add_tlv(skb, service_name_tlv,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100363 service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100364
Samuel Ortizeda21f12012-03-05 01:03:43 +0100365 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
366 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
367
Samuel Ortizd6469602011-12-14 16:43:12 +0100368 skb_queue_tail(&local->tx_queue, skb);
369
370 return 0;
371
372error_tlv:
373 pr_err("error %d\n", err);
374
375 kfree(service_name_tlv);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100376 kfree(miux_tlv);
377 kfree(rw_tlv);
Samuel Ortizd6469602011-12-14 16:43:12 +0100378
379 return err;
380}
381
382int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
383{
384 struct nfc_llcp_local *local;
385 struct sk_buff *skb;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100386 u8 *miux_tlv = NULL, miux_tlv_length;
387 u8 *rw_tlv = NULL, rw_tlv_length, rw;
388 __be16 miux;
389 int err;
390 u16 size = 0;
Samuel Ortizd6469602011-12-14 16:43:12 +0100391
392 pr_debug("Sending CC\n");
393
394 local = sock->local;
395 if (local == NULL)
396 return -ENODEV;
397
Samuel Ortizeda21f12012-03-05 01:03:43 +0100398 miux = cpu_to_be16(LLCP_MAX_MIUX);
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100399 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
400 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100401 size += miux_tlv_length;
402
403 rw = LLCP_MAX_RW;
404 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
405 size += rw_tlv_length;
406
407 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
408 if (skb == NULL) {
409 err = -ENOMEM;
410 goto error_tlv;
411 }
412
413 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
414 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100415
416 skb_queue_tail(&local->tx_queue, skb);
417
418 return 0;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100419
420error_tlv:
421 pr_err("error %d\n", err);
422
423 kfree(miux_tlv);
424 kfree(rw_tlv);
425
426 return err;
Samuel Ortizd6469602011-12-14 16:43:12 +0100427}
428
429int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
430{
431 struct sk_buff *skb;
432 struct nfc_dev *dev;
433 u16 size = 1; /* Reason code */
434
435 pr_debug("Sending DM reason 0x%x\n", reason);
436
437 if (local == NULL)
438 return -ENODEV;
439
440 dev = local->dev;
441 if (dev == NULL)
442 return -ENODEV;
443
444 size += LLCP_HEADER_SIZE;
445 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
446
447 skb = alloc_skb(size, GFP_KERNEL);
448 if (skb == NULL)
449 return -ENOMEM;
450
451 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
452
Samuel Ortizffc29312012-04-10 19:43:16 +0200453 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
Samuel Ortizd6469602011-12-14 16:43:12 +0100454
455 memcpy(skb_put(skb, 1), &reason, 1);
456
457 skb_queue_head(&local->tx_queue, skb);
458
459 return 0;
460}
461
462int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
463{
464 struct sk_buff *skb;
465 struct nfc_llcp_local *local;
466
467 pr_debug("Send DISC\n");
468
469 local = sock->local;
470 if (local == NULL)
471 return -ENODEV;
472
473 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
474 if (skb == NULL)
475 return -ENOMEM;
476
477 skb_queue_head(&local->tx_queue, skb);
478
479 return 0;
480}
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100481
482int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100483 struct msghdr *msg, size_t len)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100484{
485 struct sk_buff *pdu;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100486 struct sock *sk = &sock->sk;
487 struct nfc_llcp_local *local;
488 size_t frag_len = 0, remaining_len;
489 u8 *msg_data, *msg_ptr;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100490
Samuel Ortize65b0f42012-03-05 01:03:44 +0100491 pr_debug("Send I frame len %zd\n", len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100492
Samuel Ortize65b0f42012-03-05 01:03:44 +0100493 local = sock->local;
494 if (local == NULL)
495 return -ENODEV;
496
497 msg_data = kzalloc(len, GFP_KERNEL);
498 if (msg_data == NULL)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100499 return -ENOMEM;
500
Samuel Ortize65b0f42012-03-05 01:03:44 +0100501 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100502 kfree(msg_data);
503 return -EFAULT;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100504 }
505
Samuel Ortize65b0f42012-03-05 01:03:44 +0100506 remaining_len = len;
507 msg_ptr = msg_data;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100508
Samuel Ortize65b0f42012-03-05 01:03:44 +0100509 while (remaining_len > 0) {
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100510
Samuel Ortiz93d7e492012-05-14 17:37:32 +0200511 frag_len = min_t(size_t, sock->miu, remaining_len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100512
Samuel Ortize65b0f42012-03-05 01:03:44 +0100513 pr_debug("Fragment %zd bytes remaining %zd",
514 frag_len, remaining_len);
515
516 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
517 frag_len + LLCP_SEQUENCE_SIZE);
518 if (pdu == NULL)
519 return -ENOMEM;
520
521 skb_put(pdu, LLCP_SEQUENCE_SIZE);
522
523 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
524
Samuel Ortizbdbc59b2012-05-10 19:45:52 +0200525 skb_queue_tail(&sock->tx_queue, pdu);
Samuel Ortize65b0f42012-03-05 01:03:44 +0100526
527 lock_sock(sk);
528
529 nfc_llcp_queue_i_frames(sock);
530
531 release_sock(sk);
532
533 remaining_len -= frag_len;
Samuel Ortizb4838d12012-04-10 19:43:03 +0200534 msg_ptr += frag_len;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100535 }
536
537 kfree(msg_data);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100538
Samuel Ortiz43472ff2012-05-07 12:31:21 +0200539 return len;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100540}
Samuel Ortizd094afa2012-03-05 01:03:42 +0100541
542int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
543{
544 struct sk_buff *skb;
545 struct nfc_llcp_local *local;
546
547 pr_debug("Send rr nr %d\n", sock->recv_n);
548
549 local = sock->local;
550 if (local == NULL)
551 return -ENODEV;
552
553 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
554 if (skb == NULL)
555 return -ENOMEM;
556
557 skb_put(skb, LLCP_SEQUENCE_SIZE);
558
Samuel Ortiz279cf172012-04-10 19:43:14 +0200559 skb->data[2] = sock->recv_n;
Samuel Ortizd094afa2012-03-05 01:03:42 +0100560
561 skb_queue_head(&local->tx_queue, skb);
562
563 return 0;
564}