Commit | Line | Data |
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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 | 186 | case LLCP_TLV_MIUX: |
e4306bec | 187 | sock->remote_miu = llcp_tlv_miux(tlv) + 128; |
93d7e490 | 188 | break; |
d646960f | 189 | case LLCP_TLV_RW: |
e4306bec | 190 | sock->remote_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 | ||
e4306bec SO |
203 | pr_debug("sock %p rw %d miu %d\n", sock, |
204 | sock->remote_rw, sock->remote_miu); | |
d646960f SO |
205 | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static struct sk_buff *llcp_add_header(struct sk_buff *pdu, | |
427a2eb1 | 210 | u8 dsap, u8 ssap, u8 ptype) |
d646960f SO |
211 | { |
212 | u8 header[2]; | |
213 | ||
214 | pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap); | |
215 | ||
216 | header[0] = (u8)((dsap << 2) | (ptype >> 2)); | |
217 | header[1] = (u8)((ptype << 6) | ssap); | |
218 | ||
219 | pr_debug("header 0x%x 0x%x\n", header[0], header[1]); | |
220 | ||
221 | memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE); | |
222 | ||
223 | return pdu; | |
224 | } | |
225 | ||
427a2eb1 SO |
226 | static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv, |
227 | u8 tlv_length) | |
d646960f SO |
228 | { |
229 | /* XXX Add an skb length check */ | |
230 | ||
231 | if (tlv == NULL) | |
232 | return NULL; | |
233 | ||
234 | memcpy(skb_put(pdu, tlv_length), tlv, tlv_length); | |
235 | ||
236 | return pdu; | |
237 | } | |
238 | ||
239 | static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock, | |
427a2eb1 | 240 | u8 cmd, u16 size) |
d646960f SO |
241 | { |
242 | struct sk_buff *skb; | |
243 | int err; | |
244 | ||
245 | if (sock->ssap == 0) | |
246 | return NULL; | |
247 | ||
248 | skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
427a2eb1 | 249 | size + LLCP_HEADER_SIZE, &err); |
d646960f SO |
250 | if (skb == NULL) { |
251 | pr_err("Could not allocate PDU\n"); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd); | |
256 | ||
257 | return skb; | |
258 | } | |
259 | ||
260 | int nfc_llcp_disconnect(struct nfc_llcp_sock *sock) | |
261 | { | |
262 | struct sk_buff *skb; | |
263 | struct nfc_dev *dev; | |
264 | struct nfc_llcp_local *local; | |
d646960f SO |
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 | ||
92223906 | 276 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); |
d646960f SO |
277 | if (skb == NULL) |
278 | return -ENOMEM; | |
279 | ||
d646960f SO |
280 | skb_queue_tail(&local->tx_queue, skb); |
281 | ||
282 | return 0; | |
283 | } | |
284 | ||
285 | int nfc_llcp_send_symm(struct nfc_dev *dev) | |
286 | { | |
287 | struct sk_buff *skb; | |
288 | struct nfc_llcp_local *local; | |
289 | u16 size = 0; | |
290 | ||
291 | pr_debug("Sending SYMM\n"); | |
292 | ||
293 | local = nfc_llcp_find_local(dev); | |
294 | if (local == NULL) | |
295 | return -ENODEV; | |
296 | ||
297 | size += LLCP_HEADER_SIZE; | |
298 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
299 | ||
300 | skb = alloc_skb(size, GFP_KERNEL); | |
301 | if (skb == NULL) | |
302 | return -ENOMEM; | |
303 | ||
304 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
305 | ||
306 | skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM); | |
307 | ||
2c2d45bd TE |
308 | __net_timestamp(skb); |
309 | ||
4463523b TE |
310 | nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX); |
311 | ||
d646960f | 312 | return nfc_data_exchange(dev, local->target_idx, skb, |
427a2eb1 | 313 | nfc_llcp_recv, local); |
d646960f SO |
314 | } |
315 | ||
316 | int 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; | |
eda21f16 | 321 | u8 *miux_tlv = NULL, miux_tlv_length; |
52feb444 | 322 | u8 *rw_tlv = NULL, rw_tlv_length; |
d646960f SO |
323 | int err; |
324 | u16 size = 0; | |
325 | ||
326 | pr_debug("Sending CONNECT\n"); | |
327 | ||
328 | local = sock->local; | |
329 | if (local == NULL) | |
330 | return -ENODEV; | |
331 | ||
332 | if (sock->service_name != NULL) { | |
333 | service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN, | |
427a2eb1 SO |
334 | sock->service_name, |
335 | sock->service_name_len, | |
336 | &service_name_tlv_length); | |
d646960f SO |
337 | size += service_name_tlv_length; |
338 | } | |
339 | ||
52feb444 | 340 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
427a2eb1 | 341 | &miux_tlv_length); |
eda21f16 SO |
342 | size += miux_tlv_length; |
343 | ||
52feb444 | 344 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); |
eda21f16 SO |
345 | size += rw_tlv_length; |
346 | ||
d646960f SO |
347 | pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len); |
348 | ||
349 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size); | |
350 | if (skb == NULL) { | |
351 | err = -ENOMEM; | |
352 | goto error_tlv; | |
353 | } | |
354 | ||
355 | if (service_name_tlv != NULL) | |
356 | skb = llcp_add_tlv(skb, service_name_tlv, | |
427a2eb1 | 357 | service_name_tlv_length); |
d646960f | 358 | |
eda21f16 SO |
359 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); |
360 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
361 | ||
d646960f SO |
362 | skb_queue_tail(&local->tx_queue, skb); |
363 | ||
364 | return 0; | |
365 | ||
366 | error_tlv: | |
367 | pr_err("error %d\n", err); | |
368 | ||
369 | kfree(service_name_tlv); | |
eda21f16 SO |
370 | kfree(miux_tlv); |
371 | kfree(rw_tlv); | |
d646960f SO |
372 | |
373 | return err; | |
374 | } | |
375 | ||
376 | int nfc_llcp_send_cc(struct nfc_llcp_sock *sock) | |
377 | { | |
378 | struct nfc_llcp_local *local; | |
379 | struct sk_buff *skb; | |
eda21f16 | 380 | u8 *miux_tlv = NULL, miux_tlv_length; |
52feb444 | 381 | u8 *rw_tlv = NULL, rw_tlv_length; |
eda21f16 SO |
382 | int err; |
383 | u16 size = 0; | |
d646960f SO |
384 | |
385 | pr_debug("Sending CC\n"); | |
386 | ||
387 | local = sock->local; | |
388 | if (local == NULL) | |
389 | return -ENODEV; | |
390 | ||
52feb444 | 391 | miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0, |
427a2eb1 | 392 | &miux_tlv_length); |
eda21f16 SO |
393 | size += miux_tlv_length; |
394 | ||
52feb444 | 395 | rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &local->rw, 0, &rw_tlv_length); |
eda21f16 SO |
396 | size += rw_tlv_length; |
397 | ||
398 | skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size); | |
399 | if (skb == NULL) { | |
400 | err = -ENOMEM; | |
401 | goto error_tlv; | |
402 | } | |
403 | ||
404 | skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length); | |
405 | skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length); | |
d646960f SO |
406 | |
407 | skb_queue_tail(&local->tx_queue, skb); | |
408 | ||
409 | return 0; | |
eda21f16 SO |
410 | |
411 | error_tlv: | |
412 | pr_err("error %d\n", err); | |
413 | ||
414 | kfree(miux_tlv); | |
415 | kfree(rw_tlv); | |
416 | ||
417 | return err; | |
d646960f SO |
418 | } |
419 | ||
c43bb03d SO |
420 | int nfc_llcp_send_snl(struct nfc_llcp_local *local, u8 tid, u8 sap) |
421 | { | |
422 | struct sk_buff *skb; | |
423 | struct nfc_dev *dev; | |
424 | u8 *sdres_tlv = NULL, sdres_tlv_length, sdres[2]; | |
425 | u16 size = 0; | |
426 | ||
427 | pr_debug("Sending SNL tid 0x%x sap 0x%x\n", tid, sap); | |
428 | ||
429 | if (local == NULL) | |
430 | return -ENODEV; | |
431 | ||
432 | dev = local->dev; | |
433 | if (dev == NULL) | |
434 | return -ENODEV; | |
435 | ||
436 | sdres[0] = tid; | |
437 | sdres[1] = sap; | |
438 | sdres_tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, sdres, 0, | |
439 | &sdres_tlv_length); | |
440 | if (sdres_tlv == NULL) | |
441 | return -ENOMEM; | |
442 | ||
443 | size += LLCP_HEADER_SIZE; | |
444 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
445 | size += sdres_tlv_length; | |
446 | ||
447 | skb = alloc_skb(size, GFP_KERNEL); | |
448 | if (skb == NULL) { | |
449 | kfree(sdres_tlv); | |
450 | return -ENOMEM; | |
451 | } | |
452 | ||
453 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
454 | ||
455 | skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL); | |
456 | ||
457 | memcpy(skb_put(skb, sdres_tlv_length), sdres_tlv, sdres_tlv_length); | |
458 | ||
459 | skb_queue_tail(&local->tx_queue, skb); | |
460 | ||
461 | kfree(sdres_tlv); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
d646960f SO |
466 | int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason) |
467 | { | |
468 | struct sk_buff *skb; | |
469 | struct nfc_dev *dev; | |
470 | u16 size = 1; /* Reason code */ | |
471 | ||
472 | pr_debug("Sending DM reason 0x%x\n", reason); | |
473 | ||
474 | if (local == NULL) | |
475 | return -ENODEV; | |
476 | ||
477 | dev = local->dev; | |
478 | if (dev == NULL) | |
479 | return -ENODEV; | |
480 | ||
481 | size += LLCP_HEADER_SIZE; | |
482 | size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE; | |
483 | ||
484 | skb = alloc_skb(size, GFP_KERNEL); | |
485 | if (skb == NULL) | |
486 | return -ENOMEM; | |
487 | ||
488 | skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE); | |
489 | ||
ffc29315 | 490 | skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM); |
d646960f SO |
491 | |
492 | memcpy(skb_put(skb, 1), &reason, 1); | |
493 | ||
494 | skb_queue_head(&local->tx_queue, skb); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock) | |
500 | { | |
501 | struct sk_buff *skb; | |
502 | struct nfc_llcp_local *local; | |
503 | ||
504 | pr_debug("Send DISC\n"); | |
505 | ||
506 | local = sock->local; | |
507 | if (local == NULL) | |
508 | return -ENODEV; | |
509 | ||
510 | skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0); | |
511 | if (skb == NULL) | |
512 | return -ENOMEM; | |
513 | ||
514 | skb_queue_head(&local->tx_queue, skb); | |
515 | ||
516 | return 0; | |
517 | } | |
53a0ac2e SO |
518 | |
519 | int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock, | |
427a2eb1 | 520 | struct msghdr *msg, size_t len) |
53a0ac2e SO |
521 | { |
522 | struct sk_buff *pdu; | |
e65b0f46 SO |
523 | struct sock *sk = &sock->sk; |
524 | struct nfc_llcp_local *local; | |
525 | size_t frag_len = 0, remaining_len; | |
526 | u8 *msg_data, *msg_ptr; | |
53a0ac2e | 527 | |
e65b0f46 | 528 | pr_debug("Send I frame len %zd\n", len); |
53a0ac2e | 529 | |
e65b0f46 SO |
530 | local = sock->local; |
531 | if (local == NULL) | |
532 | return -ENODEV; | |
53a0ac2e | 533 | |
dd2bf43f SO |
534 | /* Remote is ready but has not acknowledged our frames */ |
535 | if((sock->remote_ready && | |
e4306bec SO |
536 | skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw && |
537 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { | |
dd2bf43f SO |
538 | pr_err("Pending queue is full %d frames\n", |
539 | skb_queue_len(&sock->tx_pending_queue)); | |
540 | return -ENOBUFS; | |
541 | } | |
542 | ||
543 | /* Remote is not ready and we've been queueing enough frames */ | |
544 | if ((!sock->remote_ready && | |
e4306bec | 545 | skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) { |
dd2bf43f SO |
546 | pr_err("Tx queue is full %d frames\n", |
547 | skb_queue_len(&sock->tx_queue)); | |
548 | return -ENOBUFS; | |
549 | } | |
550 | ||
e65b0f46 SO |
551 | msg_data = kzalloc(len, GFP_KERNEL); |
552 | if (msg_data == NULL) | |
553 | return -ENOMEM; | |
53a0ac2e | 554 | |
e65b0f46 | 555 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { |
427a2eb1 SO |
556 | kfree(msg_data); |
557 | return -EFAULT; | |
53a0ac2e SO |
558 | } |
559 | ||
e65b0f46 SO |
560 | remaining_len = len; |
561 | msg_ptr = msg_data; | |
562 | ||
563 | while (remaining_len > 0) { | |
564 | ||
e4306bec | 565 | frag_len = min_t(size_t, sock->remote_miu, remaining_len); |
53a0ac2e | 566 | |
e65b0f46 SO |
567 | pr_debug("Fragment %zd bytes remaining %zd", |
568 | frag_len, remaining_len); | |
53a0ac2e | 569 | |
e65b0f46 SO |
570 | pdu = llcp_allocate_pdu(sock, LLCP_PDU_I, |
571 | frag_len + LLCP_SEQUENCE_SIZE); | |
572 | if (pdu == NULL) | |
573 | return -ENOMEM; | |
574 | ||
575 | skb_put(pdu, LLCP_SEQUENCE_SIZE); | |
576 | ||
577 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
578 | ||
bdbc59b3 | 579 | skb_queue_tail(&sock->tx_queue, pdu); |
e65b0f46 SO |
580 | |
581 | lock_sock(sk); | |
582 | ||
583 | nfc_llcp_queue_i_frames(sock); | |
584 | ||
585 | release_sock(sk); | |
586 | ||
587 | remaining_len -= frag_len; | |
b4838d12 | 588 | msg_ptr += frag_len; |
e65b0f46 | 589 | } |
53a0ac2e | 590 | |
e65b0f46 | 591 | kfree(msg_data); |
53a0ac2e | 592 | |
43472fff | 593 | return len; |
53a0ac2e | 594 | } |
d094afa1 | 595 | |
94f418a2 SO |
596 | int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap, |
597 | struct msghdr *msg, size_t len) | |
598 | { | |
599 | struct sk_buff *pdu; | |
600 | struct nfc_llcp_local *local; | |
601 | size_t frag_len = 0, remaining_len; | |
6e950fd2 | 602 | u8 *msg_ptr, *msg_data; |
94f418a2 SO |
603 | int err; |
604 | ||
605 | pr_debug("Send UI frame len %zd\n", len); | |
606 | ||
607 | local = sock->local; | |
608 | if (local == NULL) | |
609 | return -ENODEV; | |
610 | ||
6e950fd2 SO |
611 | msg_data = kzalloc(len, GFP_KERNEL); |
612 | if (msg_data == NULL) | |
613 | return -ENOMEM; | |
614 | ||
615 | if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) { | |
616 | kfree(msg_data); | |
617 | return -EFAULT; | |
618 | } | |
619 | ||
94f418a2 | 620 | remaining_len = len; |
6e950fd2 | 621 | msg_ptr = msg_data; |
94f418a2 SO |
622 | |
623 | while (remaining_len > 0) { | |
624 | ||
e4306bec | 625 | frag_len = min_t(size_t, sock->remote_miu, remaining_len); |
94f418a2 SO |
626 | |
627 | pr_debug("Fragment %zd bytes remaining %zd", | |
628 | frag_len, remaining_len); | |
629 | ||
630 | pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT, | |
631 | frag_len + LLCP_HEADER_SIZE, &err); | |
632 | if (pdu == NULL) { | |
633 | pr_err("Could not allocate PDU\n"); | |
634 | continue; | |
635 | } | |
636 | ||
637 | pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI); | |
638 | ||
639 | memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len); | |
640 | ||
641 | /* No need to check for the peer RW for UI frames */ | |
642 | skb_queue_tail(&local->tx_queue, pdu); | |
643 | ||
644 | remaining_len -= frag_len; | |
645 | msg_ptr += frag_len; | |
646 | } | |
647 | ||
6e950fd2 SO |
648 | kfree(msg_data); |
649 | ||
94f418a2 SO |
650 | return len; |
651 | } | |
652 | ||
d094afa1 SO |
653 | int nfc_llcp_send_rr(struct nfc_llcp_sock *sock) |
654 | { | |
655 | struct sk_buff *skb; | |
656 | struct nfc_llcp_local *local; | |
657 | ||
658 | pr_debug("Send rr nr %d\n", sock->recv_n); | |
659 | ||
660 | local = sock->local; | |
661 | if (local == NULL) | |
662 | return -ENODEV; | |
663 | ||
664 | skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE); | |
665 | if (skb == NULL) | |
666 | return -ENOMEM; | |
667 | ||
668 | skb_put(skb, LLCP_SEQUENCE_SIZE); | |
669 | ||
279cf174 | 670 | skb->data[2] = sock->recv_n; |
d094afa1 SO |
671 | |
672 | skb_queue_head(&local->tx_queue, skb); | |
673 | ||
674 | return 0; | |
675 | } |