blob: ed2d17312d61d79bc224183e1e58e4fc11d208be [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
Samuel Ortiz76762b72012-05-14 17:38:54 +020054static u16 llcp_tlv16(u8 *tlv, u8 type)
Samuel Ortizd6469602011-12-14 16:43:12 +010055{
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{
Samuel Ortiz76762b72012-05-14 17:38:54 +020070 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
Samuel Ortizd6469602011-12-14 16:43:12 +010071}
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;
Samuel Ortizd6469602011-12-14 16:43:12 +0100264
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
Samuel Ortiz92223902012-10-05 01:09:07 +0200275 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
Samuel Ortizd6469602011-12-14 16:43:12 +0100276 if (skb == NULL)
277 return -ENOMEM;
278
Samuel Ortizd6469602011-12-14 16:43:12 +0100279 skb_queue_tail(&local->tx_queue, skb);
280
281 return 0;
282}
283
284int 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
Thierry Escande4463523b2012-09-26 18:16:44 +0200307 nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX);
308
Samuel Ortizd6469602011-12-14 16:43:12 +0100309 return nfc_data_exchange(dev, local->target_idx, skb,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100310 nfc_llcp_recv, local);
Samuel Ortizd6469602011-12-14 16:43:12 +0100311}
312
313int 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;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100318 u8 *miux_tlv = NULL, miux_tlv_length;
Thierry Escande52feb442012-10-17 14:43:39 +0200319 u8 *rw_tlv = NULL, rw_tlv_length;
Samuel Ortizd6469602011-12-14 16:43:12 +0100320 int err;
321 u16 size = 0;
322
323 pr_debug("Sending CONNECT\n");
324
325 local = sock->local;
326 if (local == NULL)
327 return -ENODEV;
328
329 if (sock->service_name != NULL) {
330 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100331 sock->service_name,
332 sock->service_name_len,
333 &service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100334 size += service_name_tlv_length;
335 }
336
Thierry Escande52feb442012-10-17 14:43:39 +0200337 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100338 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100339 size += miux_tlv_length;
340
Thierry Escande52feb442012-10-17 14:43:39 +0200341 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100342 size += rw_tlv_length;
343
Samuel Ortizd6469602011-12-14 16:43:12 +0100344 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
345
346 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
347 if (skb == NULL) {
348 err = -ENOMEM;
349 goto error_tlv;
350 }
351
352 if (service_name_tlv != NULL)
353 skb = llcp_add_tlv(skb, service_name_tlv,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100354 service_name_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100355
Samuel Ortizeda21f12012-03-05 01:03:43 +0100356 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
357 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
358
Samuel Ortizd6469602011-12-14 16:43:12 +0100359 skb_queue_tail(&local->tx_queue, skb);
360
361 return 0;
362
363error_tlv:
364 pr_err("error %d\n", err);
365
366 kfree(service_name_tlv);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100367 kfree(miux_tlv);
368 kfree(rw_tlv);
Samuel Ortizd6469602011-12-14 16:43:12 +0100369
370 return err;
371}
372
373int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
374{
375 struct nfc_llcp_local *local;
376 struct sk_buff *skb;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100377 u8 *miux_tlv = NULL, miux_tlv_length;
Thierry Escande52feb442012-10-17 14:43:39 +0200378 u8 *rw_tlv = NULL, rw_tlv_length;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100379 int err;
380 u16 size = 0;
Samuel Ortizd6469602011-12-14 16:43:12 +0100381
382 pr_debug("Sending CC\n");
383
384 local = sock->local;
385 if (local == NULL)
386 return -ENODEV;
387
Thierry Escande52feb442012-10-17 14:43:39 +0200388 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100389 &miux_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100390 size += miux_tlv_length;
391
Thierry Escande52feb442012-10-17 14:43:39 +0200392 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length);
Samuel Ortizeda21f12012-03-05 01:03:43 +0100393 size += rw_tlv_length;
394
395 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
396 if (skb == NULL) {
397 err = -ENOMEM;
398 goto error_tlv;
399 }
400
401 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
402 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
Samuel Ortizd6469602011-12-14 16:43:12 +0100403
404 skb_queue_tail(&local->tx_queue, skb);
405
406 return 0;
Samuel Ortizeda21f12012-03-05 01:03:43 +0100407
408error_tlv:
409 pr_err("error %d\n", err);
410
411 kfree(miux_tlv);
412 kfree(rw_tlv);
413
414 return err;
Samuel Ortizd6469602011-12-14 16:43:12 +0100415}
416
Samuel Ortizc43bb032012-10-05 01:13:24 +0200417int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap)
418{
419 struct sk_buff *skb;
420 struct nfc_dev *dev;
421 u8 *sdres_tlv = NULL, sdres_tlv_length, sdres[2];
422 u16 size = 0;
423
424 pr_debug("Sending SNL tid 0x%x sap 0x%x\n", tid, sap);
425
426 if (local == NULL)
427 return -ENODEV;
428
429 dev = local->dev;
430 if (dev == NULL)
431 return -ENODEV;
432
433 sdres[0] = tid;
434 sdres[1] = sap;
435 sdres_tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, sdres, 0,
436 &sdres_tlv_length);
437 if (sdres_tlv == NULL)
438 return -ENOMEM;
439
440 size += LLCP_HEADER_SIZE;
441 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
442 size += sdres_tlv_length;
443
444 skb = alloc_skb(size, GFP_KERNEL);
445 if (skb == NULL) {
446 kfree(sdres_tlv);
447 return -ENOMEM;
448 }
449
450 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
451
452 skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
453
454 memcpy(skb_put(skb, sdres_tlv_length), sdres_tlv, sdres_tlv_length);
455
456 skb_queue_tail(&local->tx_queue, skb);
457
458 kfree(sdres_tlv);
459
460 return 0;
461}
462
Samuel Ortizd6469602011-12-14 16:43:12 +0100463int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
464{
465 struct sk_buff *skb;
466 struct nfc_dev *dev;
467 u16 size = 1; /* Reason code */
468
469 pr_debug("Sending DM reason 0x%x\n", reason);
470
471 if (local == NULL)
472 return -ENODEV;
473
474 dev = local->dev;
475 if (dev == NULL)
476 return -ENODEV;
477
478 size += LLCP_HEADER_SIZE;
479 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
480
481 skb = alloc_skb(size, GFP_KERNEL);
482 if (skb == NULL)
483 return -ENOMEM;
484
485 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
486
Samuel Ortizffc29312012-04-10 19:43:16 +0200487 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
Samuel Ortizd6469602011-12-14 16:43:12 +0100488
489 memcpy(skb_put(skb, 1), &reason, 1);
490
491 skb_queue_head(&local->tx_queue, skb);
492
493 return 0;
494}
495
496int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
497{
498 struct sk_buff *skb;
499 struct nfc_llcp_local *local;
500
501 pr_debug("Send DISC\n");
502
503 local = sock->local;
504 if (local == NULL)
505 return -ENODEV;
506
507 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
508 if (skb == NULL)
509 return -ENOMEM;
510
511 skb_queue_head(&local->tx_queue, skb);
512
513 return 0;
514}
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100515
516int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100517 struct msghdr *msg, size_t len)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100518{
519 struct sk_buff *pdu;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100520 struct sock *sk = &sock->sk;
521 struct nfc_llcp_local *local;
522 size_t frag_len = 0, remaining_len;
523 u8 *msg_data, *msg_ptr;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100524
Samuel Ortize65b0f42012-03-05 01:03:44 +0100525 pr_debug("Send I frame len %zd\n", len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100526
Samuel Ortize65b0f42012-03-05 01:03:44 +0100527 local = sock->local;
528 if (local == NULL)
529 return -ENODEV;
530
531 msg_data = kzalloc(len, GFP_KERNEL);
532 if (msg_data == NULL)
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100533 return -ENOMEM;
534
Samuel Ortize65b0f42012-03-05 01:03:44 +0100535 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
Samuel Ortiz427a2eb2012-03-05 01:03:52 +0100536 kfree(msg_data);
537 return -EFAULT;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100538 }
539
Samuel Ortize65b0f42012-03-05 01:03:44 +0100540 remaining_len = len;
541 msg_ptr = msg_data;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100542
Samuel Ortize65b0f42012-03-05 01:03:44 +0100543 while (remaining_len > 0) {
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100544
Samuel Ortiz93d7e492012-05-14 17:37:32 +0200545 frag_len = min_t(size_t, sock->miu, remaining_len);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100546
Samuel Ortize65b0f42012-03-05 01:03:44 +0100547 pr_debug("Fragment %zd bytes remaining %zd",
548 frag_len, remaining_len);
549
550 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
551 frag_len + LLCP_SEQUENCE_SIZE);
552 if (pdu == NULL)
553 return -ENOMEM;
554
555 skb_put(pdu, LLCP_SEQUENCE_SIZE);
556
557 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
558
Samuel Ortizbdbc59b2012-05-10 19:45:52 +0200559 skb_queue_tail(&sock->tx_queue, pdu);
Samuel Ortize65b0f42012-03-05 01:03:44 +0100560
561 lock_sock(sk);
562
563 nfc_llcp_queue_i_frames(sock);
564
565 release_sock(sk);
566
567 remaining_len -= frag_len;
Samuel Ortizb4838d12012-04-10 19:43:03 +0200568 msg_ptr += frag_len;
Samuel Ortize65b0f42012-03-05 01:03:44 +0100569 }
570
571 kfree(msg_data);
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100572
Samuel Ortiz43472ff2012-05-07 12:31:21 +0200573 return len;
Samuel Ortiz53a0ac22012-03-05 01:03:37 +0100574}
Samuel Ortizd094afa2012-03-05 01:03:42 +0100575
Samuel Ortiz94f418a2012-10-16 15:01:40 +0200576int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
577 struct msghdr *msg, size_t len)
578{
579 struct sk_buff *pdu;
580 struct nfc_llcp_local *local;
581 size_t frag_len = 0, remaining_len;
582 u8 *msg_ptr;
583 int err;
584
585 pr_debug("Send UI frame len %zd\n", len);
586
587 local = sock->local;
588 if (local == NULL)
589 return -ENODEV;
590
591 remaining_len = len;
592 msg_ptr = (u8 *) msg->msg_iov;
593
594 while (remaining_len > 0) {
595
596 frag_len = min_t(size_t, sock->miu, remaining_len);
597
598 pr_debug("Fragment %zd bytes remaining %zd",
599 frag_len, remaining_len);
600
601 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
602 frag_len + LLCP_HEADER_SIZE, &err);
603 if (pdu == NULL) {
604 pr_err("Could not allocate PDU\n");
605 continue;
606 }
607
608 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
609
610 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
611
612 /* No need to check for the peer RW for UI frames */
613 skb_queue_tail(&local->tx_queue, pdu);
614
615 remaining_len -= frag_len;
616 msg_ptr += frag_len;
617 }
618
619 return len;
620}
621
Samuel Ortizd094afa2012-03-05 01:03:42 +0100622int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
623{
624 struct sk_buff *skb;
625 struct nfc_llcp_local *local;
626
627 pr_debug("Send rr nr %d\n", sock->recv_n);
628
629 local = sock->local;
630 if (local == NULL)
631 return -ENODEV;
632
633 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
634 if (skb == NULL)
635 return -ENOMEM;
636
637 skb_put(skb, LLCP_SEQUENCE_SIZE);
638
Samuel Ortiz279cf172012-04-10 19:43:14 +0200639 skb->data[2] = sock->recv_n;
Samuel Ortizd094afa2012-03-05 01:03:42 +0100640
641 skb_queue_head(&local->tx_queue, skb);
642
643 return 0;
644}