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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 | 318 | u8 *miux_tlv = NULL, miux_tlv_length; |
52feb444 | 319 | u8 *rw_tlv = NULL, rw_tlv_length; |
d646960f SO |
320 | 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, | |
427a2eb1 SO |
331 | sock->service_name, |
332 | sock->service_name_len, | |
333 | &service_name_tlv_length); | |
d646960f SO |
334 | size += service_name_tlv_length; |
335 | } | |
336 | ||
52feb444 | 337 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
427a2eb1 | 338 | &miux_tlv_length); |
eda21f16 SO |
339 | size += miux_tlv_length; |
340 | ||
52feb444 | 341 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); |
eda21f16 SO |
342 | size += rw_tlv_length; |
343 | ||
d646960f SO |
344 | 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, | |
427a2eb1 | 354 | service_name_tlv_length); |
d646960f | 355 | |
eda21f16 SO |
356 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
357 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
358 | ||
d646960f SO |
359 | skb_queue_tail(&local->tx_queue, skb); |
360 | ||
361 | return 0; | |
362 | ||
363 | error_tlv: | |
364 | pr_err("error %d\n", err); | |
365 | ||
366 | kfree(service_name_tlv); | |
eda21f16 SO |
367 | kfree(miux_tlv); |
368 | kfree(rw_tlv); | |
d646960f SO |
369 | |
370 | return err; | |
371 | } | |
372 | ||
373 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
374 | { | |
375 | struct nfc_llcp_local *local; | |
376 | struct sk_buff *skb; | |
eda21f16 | 377 | u8 *miux_tlv = NULL, miux_tlv_length; |
52feb444 | 378 | u8 *rw_tlv = NULL, rw_tlv_length; |
eda21f16 SO |
379 | int err; |
380 | u16 size = 0; | |
d646960f SO |
381 | |
382 | pr_debug("Sending CC\n"); | |
383 | ||
384 | local = sock->local; | |
385 | if (local == NULL) | |
386 | return -ENODEV; | |
387 | ||
52feb444 | 388 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
427a2eb1 | 389 | &miux_tlv_length); |
eda21f16 SO |
390 | size += miux_tlv_length; |
391 | ||
52feb444 | 392 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); |
eda21f16 SO |
393 | 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); | |
d646960f SO |
403 | |
404 | skb_queue_tail(&local->tx_queue, skb); | |
405 | ||
406 | return 0; | |
eda21f16 SO |
407 | |
408 | error_tlv: | |
409 | pr_err("error %d\n", err); | |
410 | ||
411 | kfree(miux_tlv); | |
412 | kfree(rw_tlv); | |
413 | ||
414 | return err; | |
d646960f SO |
415 | } |
416 | ||
c43bb03d SO |
417 | int 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 | ||
d646960f SO |
463 | int 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 | ||
ffc29315 | 487 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f SO |
488 | |
489 | memcpy(skb_put(skb, 1), &reason, 1); | |
490 | ||
491 | skb_queue_head(&local->tx_queue, skb); | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
496 | int 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 | } | |
53a0ac2e SO |
515 | |
516 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, | |
427a2eb1 | 517 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
518 | { |
519 | struct sk_buff *pdu; | |
e65b0f46 SO |
520 | 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; | |
53a0ac2e | 524 | |
e65b0f46 | 525 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 526 | |
e65b0f46 SO |
527 | local = sock->local; |
528 | if (local == NULL) | |
529 | return -ENODEV; | |
53a0ac2e | 530 | |
e65b0f46 SO |
531 | msg_data = kzalloc(len, GFP_KERNEL); |
532 | if (msg_data == NULL) | |
533 | return -ENOMEM; | |
53a0ac2e | 534 | |
e65b0f46 | 535 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
427a2eb1 SO |
536 | kfree(msg_data); |
537 | return -EFAULT; | |
53a0ac2e SO |
538 | } |
539 | ||
e65b0f46 SO |
540 | remaining_len = len; |
541 | msg_ptr = msg_data; | |
542 | ||
543 | while (remaining_len > 0) { | |
544 | ||
93d7e490 | 545 | frag_len = min_t(size_t, sock->miu, remaining_len); |
53a0ac2e | 546 | |
e65b0f46 SO |
547 | pr_debug("Fragment %zd bytes remaining %zd", |
548 | frag_len, remaining_len); | |
53a0ac2e | 549 | |
e65b0f46 SO |
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 | ||
bdbc59b3 | 559 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
560 | |
561 | lock_sock(sk); | |
562 | ||
563 | nfc_llcp_queue_i_frames(sock); | |
564 | ||
565 | release_sock(sk); | |
566 | ||
567 | remaining_len -= frag_len; | |
b4838d12 | 568 | msg_ptr += frag_len; |
e65b0f46 | 569 | } |
53a0ac2e | 570 | |
e65b0f46 | 571 | kfree(msg_data); |
53a0ac2e | 572 | |
43472fff | 573 | return len; |
53a0ac2e | 574 | } |
d094afa1 | 575 | |
94f418a2 SO |
576 | int 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 | ||
d094afa1 SO |
622 | int 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 | ||
279cf174 | 639 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
640 | |
641 | skb_queue_head(&local->tx_queue, skb); | |
642 | ||
643 | return 0; | |
644 | } |