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, see <http://www.gnu.org/licenses/>.
16 */
17
18 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
19
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/nfc.h>
24
25 #include <net/nfc/nfc.h>
26
27 #include "nfc.h"
28 #include "llcp.h"
29
30 static u8 llcp_tlv_length[LLCP_TLV_MAX] = {
31 0,
32 1, /* VERSION */
33 2, /* MIUX */
34 2, /* WKS */
35 1, /* LTO */
36 1, /* RW */
37 0, /* SN */
38 1, /* OPT */
39 0, /* SDREQ */
40 2, /* SDRES */
41
42 };
43
llcp_tlv8(u8 * tlv,u8 type)44 static u8 llcp_tlv8(u8 *tlv, u8 type)
45 {
46 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
47 return 0;
48
49 return tlv[2];
50 }
51
llcp_tlv16(u8 * tlv,u8 type)52 static u16 llcp_tlv16(u8 *tlv, u8 type)
53 {
54 if (tlv[0] != type || tlv[1] != llcp_tlv_length[tlv[0]])
55 return 0;
56
57 return be16_to_cpu(*((__be16 *)(tlv + 2)));
58 }
59
60
llcp_tlv_version(u8 * tlv)61 static u8 llcp_tlv_version(u8 *tlv)
62 {
63 return llcp_tlv8(tlv, LLCP_TLV_VERSION);
64 }
65
llcp_tlv_miux(u8 * tlv)66 static u16 llcp_tlv_miux(u8 *tlv)
67 {
68 return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
69 }
70
llcp_tlv_wks(u8 * tlv)71 static u16 llcp_tlv_wks(u8 *tlv)
72 {
73 return llcp_tlv16(tlv, LLCP_TLV_WKS);
74 }
75
llcp_tlv_lto(u8 * tlv)76 static u16 llcp_tlv_lto(u8 *tlv)
77 {
78 return llcp_tlv8(tlv, LLCP_TLV_LTO);
79 }
80
llcp_tlv_opt(u8 * tlv)81 static u8 llcp_tlv_opt(u8 *tlv)
82 {
83 return llcp_tlv8(tlv, LLCP_TLV_OPT);
84 }
85
llcp_tlv_rw(u8 * tlv)86 static u8 llcp_tlv_rw(u8 *tlv)
87 {
88 return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
89 }
90
nfc_llcp_build_tlv(u8 type,u8 * value,u8 value_length,u8 * tlv_length)91 u8 *nfc_llcp_build_tlv(u8 type, u8 *value, u8 value_length, u8 *tlv_length)
92 {
93 u8 *tlv, length;
94
95 pr_debug("type %d\n", type);
96
97 if (type >= LLCP_TLV_MAX)
98 return NULL;
99
100 length = llcp_tlv_length[type];
101 if (length == 0 && value_length == 0)
102 return NULL;
103 else if (length == 0)
104 length = value_length;
105
106 *tlv_length = 2 + length;
107 tlv = kzalloc(2 + length, GFP_KERNEL);
108 if (tlv == NULL)
109 return tlv;
110
111 tlv[0] = type;
112 tlv[1] = length;
113 memcpy(tlv + 2, value, length);
114
115 return tlv;
116 }
117
nfc_llcp_build_sdres_tlv(u8 tid,u8 sap)118 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
119 {
120 struct nfc_llcp_sdp_tlv *sdres;
121 u8 value[2];
122
123 sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
124 if (sdres == NULL)
125 return NULL;
126
127 value[0] = tid;
128 value[1] = sap;
129
130 sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
131 &sdres->tlv_len);
132 if (sdres->tlv == NULL) {
133 kfree(sdres);
134 return NULL;
135 }
136
137 sdres->tid = tid;
138 sdres->sap = sap;
139
140 INIT_HLIST_NODE(&sdres->node);
141
142 return sdres;
143 }
144
nfc_llcp_build_sdreq_tlv(u8 tid,char * uri,size_t uri_len)145 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
146 size_t uri_len)
147 {
148 struct nfc_llcp_sdp_tlv *sdreq;
149
150 pr_debug("uri: %s, len: %zu\n", uri, uri_len);
151
152 sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
153 if (sdreq == NULL)
154 return NULL;
155
156 sdreq->tlv_len = uri_len + 3;
157
158 if (uri[uri_len - 1] == 0)
159 sdreq->tlv_len--;
160
161 sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
162 if (sdreq->tlv == NULL) {
163 kfree(sdreq);
164 return NULL;
165 }
166
167 sdreq->tlv[0] = LLCP_TLV_SDREQ;
168 sdreq->tlv[1] = sdreq->tlv_len - 2;
169 sdreq->tlv[2] = tid;
170
171 sdreq->tid = tid;
172 sdreq->uri = sdreq->tlv + 3;
173 memcpy(sdreq->uri, uri, uri_len);
174
175 sdreq->time = jiffies;
176
177 INIT_HLIST_NODE(&sdreq->node);
178
179 return sdreq;
180 }
181
nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv * sdp)182 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
183 {
184 kfree(sdp->tlv);
185 kfree(sdp);
186 }
187
nfc_llcp_free_sdp_tlv_list(struct hlist_head * head)188 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
189 {
190 struct nfc_llcp_sdp_tlv *sdp;
191 struct hlist_node *n;
192
193 hlist_for_each_entry_safe(sdp, n, head, node) {
194 hlist_del(&sdp->node);
195
196 nfc_llcp_free_sdp_tlv(sdp);
197 }
198 }
199
nfc_llcp_parse_gb_tlv(struct nfc_llcp_local * local,u8 * tlv_array,u16 tlv_array_len)200 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
201 u8 *tlv_array, u16 tlv_array_len)
202 {
203 u8 *tlv = tlv_array, type, length, offset = 0;
204
205 pr_debug("TLV array length %d\n", tlv_array_len);
206
207 if (local == NULL)
208 return -ENODEV;
209
210 while (offset < tlv_array_len) {
211 type = tlv[0];
212 length = tlv[1];
213
214 pr_debug("type 0x%x length %d\n", type, length);
215
216 switch (type) {
217 case LLCP_TLV_VERSION:
218 local->remote_version = llcp_tlv_version(tlv);
219 break;
220 case LLCP_TLV_MIUX:
221 local->remote_miu = llcp_tlv_miux(tlv) + 128;
222 break;
223 case LLCP_TLV_WKS:
224 local->remote_wks = llcp_tlv_wks(tlv);
225 break;
226 case LLCP_TLV_LTO:
227 local->remote_lto = llcp_tlv_lto(tlv) * 10;
228 break;
229 case LLCP_TLV_OPT:
230 local->remote_opt = llcp_tlv_opt(tlv);
231 break;
232 default:
233 pr_err("Invalid gt tlv value 0x%x\n", type);
234 break;
235 }
236
237 offset += length + 2;
238 tlv += length + 2;
239 }
240
241 pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
242 local->remote_version, local->remote_miu,
243 local->remote_lto, local->remote_opt,
244 local->remote_wks);
245
246 return 0;
247 }
248
nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock * sock,u8 * tlv_array,u16 tlv_array_len)249 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
250 u8 *tlv_array, u16 tlv_array_len)
251 {
252 u8 *tlv = tlv_array, type, length, offset = 0;
253
254 pr_debug("TLV array length %d\n", tlv_array_len);
255
256 if (sock == NULL)
257 return -ENOTCONN;
258
259 while (offset < tlv_array_len) {
260 type = tlv[0];
261 length = tlv[1];
262
263 pr_debug("type 0x%x length %d\n", type, length);
264
265 switch (type) {
266 case LLCP_TLV_MIUX:
267 sock->remote_miu = llcp_tlv_miux(tlv) + 128;
268 break;
269 case LLCP_TLV_RW:
270 sock->remote_rw = llcp_tlv_rw(tlv);
271 break;
272 case LLCP_TLV_SN:
273 break;
274 default:
275 pr_err("Invalid gt tlv value 0x%x\n", type);
276 break;
277 }
278
279 offset += length + 2;
280 tlv += length + 2;
281 }
282
283 pr_debug("sock %p rw %d miu %d\n", sock,
284 sock->remote_rw, sock->remote_miu);
285
286 return 0;
287 }
288
llcp_add_header(struct sk_buff * pdu,u8 dsap,u8 ssap,u8 ptype)289 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
290 u8 dsap, u8 ssap, u8 ptype)
291 {
292 u8 header[2];
293
294 pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
295
296 header[0] = (u8)((dsap << 2) | (ptype >> 2));
297 header[1] = (u8)((ptype << 6) | ssap);
298
299 pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
300
301 memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
302
303 return pdu;
304 }
305
llcp_add_tlv(struct sk_buff * pdu,u8 * tlv,u8 tlv_length)306 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
307 u8 tlv_length)
308 {
309 /* XXX Add an skb length check */
310
311 if (tlv == NULL)
312 return NULL;
313
314 memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
315
316 return pdu;
317 }
318
llcp_allocate_pdu(struct nfc_llcp_sock * sock,u8 cmd,u16 size)319 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
320 u8 cmd, u16 size)
321 {
322 struct sk_buff *skb;
323 int err;
324
325 if (sock->ssap == 0)
326 return NULL;
327
328 skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
329 size + LLCP_HEADER_SIZE, &err);
330 if (skb == NULL) {
331 pr_err("Could not allocate PDU\n");
332 return NULL;
333 }
334
335 skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
336
337 return skb;
338 }
339
nfc_llcp_send_disconnect(struct nfc_llcp_sock * sock)340 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
341 {
342 struct sk_buff *skb;
343 struct nfc_dev *dev;
344 struct nfc_llcp_local *local;
345
346 pr_debug("Sending DISC\n");
347
348 local = sock->local;
349 if (local == NULL)
350 return -ENODEV;
351
352 dev = sock->dev;
353 if (dev == NULL)
354 return -ENODEV;
355
356 skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
357 if (skb == NULL)
358 return -ENOMEM;
359
360 skb_queue_tail(&local->tx_queue, skb);
361
362 return 0;
363 }
364
nfc_llcp_send_symm(struct nfc_dev * dev)365 int nfc_llcp_send_symm(struct nfc_dev *dev)
366 {
367 struct sk_buff *skb;
368 struct nfc_llcp_local *local;
369 u16 size = 0;
370
371 pr_debug("Sending SYMM\n");
372
373 local = nfc_llcp_find_local(dev);
374 if (local == NULL)
375 return -ENODEV;
376
377 size += LLCP_HEADER_SIZE;
378 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
379
380 skb = alloc_skb(size, GFP_KERNEL);
381 if (skb == NULL)
382 return -ENOMEM;
383
384 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
385
386 skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
387
388 __net_timestamp(skb);
389
390 nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_TX);
391
392 return nfc_data_exchange(dev, local->target_idx, skb,
393 nfc_llcp_recv, local);
394 }
395
nfc_llcp_send_connect(struct nfc_llcp_sock * sock)396 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
397 {
398 struct nfc_llcp_local *local;
399 struct sk_buff *skb;
400 u8 *service_name_tlv = NULL, service_name_tlv_length;
401 u8 *miux_tlv = NULL, miux_tlv_length;
402 u8 *rw_tlv = NULL, rw_tlv_length, rw;
403 int err;
404 u16 size = 0, miux;
405
406 pr_debug("Sending CONNECT\n");
407
408 local = sock->local;
409 if (local == NULL)
410 return -ENODEV;
411
412 if (sock->service_name != NULL) {
413 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
414 sock->service_name,
415 sock->service_name_len,
416 &service_name_tlv_length);
417 size += service_name_tlv_length;
418 }
419
420 /* If the socket parameters are not set, use the local ones */
421 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
422 local->miux : sock->miux;
423 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
424
425 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
426 &miux_tlv_length);
427 size += miux_tlv_length;
428
429 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
430 size += rw_tlv_length;
431
432 pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
433
434 skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
435 if (skb == NULL) {
436 err = -ENOMEM;
437 goto error_tlv;
438 }
439
440 if (service_name_tlv != NULL)
441 skb = llcp_add_tlv(skb, service_name_tlv,
442 service_name_tlv_length);
443
444 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
445 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
446
447 skb_queue_tail(&local->tx_queue, skb);
448
449 return 0;
450
451 error_tlv:
452 pr_err("error %d\n", err);
453
454 kfree(service_name_tlv);
455 kfree(miux_tlv);
456 kfree(rw_tlv);
457
458 return err;
459 }
460
nfc_llcp_send_cc(struct nfc_llcp_sock * sock)461 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
462 {
463 struct nfc_llcp_local *local;
464 struct sk_buff *skb;
465 u8 *miux_tlv = NULL, miux_tlv_length;
466 u8 *rw_tlv = NULL, rw_tlv_length, rw;
467 int err;
468 u16 size = 0, miux;
469
470 pr_debug("Sending CC\n");
471
472 local = sock->local;
473 if (local == NULL)
474 return -ENODEV;
475
476 /* If the socket parameters are not set, use the local ones */
477 miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
478 local->miux : sock->miux;
479 rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
480
481 miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
482 &miux_tlv_length);
483 size += miux_tlv_length;
484
485 rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
486 size += rw_tlv_length;
487
488 skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
489 if (skb == NULL) {
490 err = -ENOMEM;
491 goto error_tlv;
492 }
493
494 skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
495 skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
496
497 skb_queue_tail(&local->tx_queue, skb);
498
499 return 0;
500
501 error_tlv:
502 pr_err("error %d\n", err);
503
504 kfree(miux_tlv);
505 kfree(rw_tlv);
506
507 return err;
508 }
509
nfc_llcp_allocate_snl(struct nfc_llcp_local * local,size_t tlv_length)510 static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
511 size_t tlv_length)
512 {
513 struct sk_buff *skb;
514 struct nfc_dev *dev;
515 u16 size = 0;
516
517 if (local == NULL)
518 return ERR_PTR(-ENODEV);
519
520 dev = local->dev;
521 if (dev == NULL)
522 return ERR_PTR(-ENODEV);
523
524 size += LLCP_HEADER_SIZE;
525 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
526 size += tlv_length;
527
528 skb = alloc_skb(size, GFP_KERNEL);
529 if (skb == NULL)
530 return ERR_PTR(-ENOMEM);
531
532 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
533
534 skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
535
536 return skb;
537 }
538
nfc_llcp_send_snl_sdres(struct nfc_llcp_local * local,struct hlist_head * tlv_list,size_t tlvs_len)539 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
540 struct hlist_head *tlv_list, size_t tlvs_len)
541 {
542 struct nfc_llcp_sdp_tlv *sdp;
543 struct hlist_node *n;
544 struct sk_buff *skb;
545
546 skb = nfc_llcp_allocate_snl(local, tlvs_len);
547 if (IS_ERR(skb))
548 return PTR_ERR(skb);
549
550 hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
551 memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);
552
553 hlist_del(&sdp->node);
554
555 nfc_llcp_free_sdp_tlv(sdp);
556 }
557
558 skb_queue_tail(&local->tx_queue, skb);
559
560 return 0;
561 }
562
nfc_llcp_send_snl_sdreq(struct nfc_llcp_local * local,struct hlist_head * tlv_list,size_t tlvs_len)563 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
564 struct hlist_head *tlv_list, size_t tlvs_len)
565 {
566 struct nfc_llcp_sdp_tlv *sdreq;
567 struct hlist_node *n;
568 struct sk_buff *skb;
569
570 skb = nfc_llcp_allocate_snl(local, tlvs_len);
571 if (IS_ERR(skb))
572 return PTR_ERR(skb);
573
574 mutex_lock(&local->sdreq_lock);
575
576 if (hlist_empty(&local->pending_sdreqs))
577 mod_timer(&local->sdreq_timer,
578 jiffies + msecs_to_jiffies(3 * local->remote_lto));
579
580 hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
581 pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);
582
583 memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv,
584 sdreq->tlv_len);
585
586 hlist_del(&sdreq->node);
587
588 hlist_add_head(&sdreq->node, &local->pending_sdreqs);
589 }
590
591 mutex_unlock(&local->sdreq_lock);
592
593 skb_queue_tail(&local->tx_queue, skb);
594
595 return 0;
596 }
597
nfc_llcp_send_dm(struct nfc_llcp_local * local,u8 ssap,u8 dsap,u8 reason)598 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
599 {
600 struct sk_buff *skb;
601 struct nfc_dev *dev;
602 u16 size = 1; /* Reason code */
603
604 pr_debug("Sending DM reason 0x%x\n", reason);
605
606 if (local == NULL)
607 return -ENODEV;
608
609 dev = local->dev;
610 if (dev == NULL)
611 return -ENODEV;
612
613 size += LLCP_HEADER_SIZE;
614 size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
615
616 skb = alloc_skb(size, GFP_KERNEL);
617 if (skb == NULL)
618 return -ENOMEM;
619
620 skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
621
622 skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
623
624 memcpy(skb_put(skb, 1), &reason, 1);
625
626 skb_queue_head(&local->tx_queue, skb);
627
628 return 0;
629 }
630
nfc_llcp_send_i_frame(struct nfc_llcp_sock * sock,struct msghdr * msg,size_t len)631 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
632 struct msghdr *msg, size_t len)
633 {
634 struct sk_buff *pdu;
635 struct sock *sk = &sock->sk;
636 struct nfc_llcp_local *local;
637 size_t frag_len = 0, remaining_len;
638 u8 *msg_data, *msg_ptr;
639 u16 remote_miu;
640
641 pr_debug("Send I frame len %zd\n", len);
642
643 local = sock->local;
644 if (local == NULL)
645 return -ENODEV;
646
647 /* Remote is ready but has not acknowledged our frames */
648 if((sock->remote_ready &&
649 skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
650 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
651 pr_err("Pending queue is full %d frames\n",
652 skb_queue_len(&sock->tx_pending_queue));
653 return -ENOBUFS;
654 }
655
656 /* Remote is not ready and we've been queueing enough frames */
657 if ((!sock->remote_ready &&
658 skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
659 pr_err("Tx queue is full %d frames\n",
660 skb_queue_len(&sock->tx_queue));
661 return -ENOBUFS;
662 }
663
664 msg_data = kzalloc(len, GFP_KERNEL);
665 if (msg_data == NULL)
666 return -ENOMEM;
667
668 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
669 kfree(msg_data);
670 return -EFAULT;
671 }
672
673 remaining_len = len;
674 msg_ptr = msg_data;
675
676 do {
677 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
678 LLCP_DEFAULT_MIU : sock->remote_miu;
679
680 frag_len = min_t(size_t, remote_miu, remaining_len);
681
682 pr_debug("Fragment %zd bytes remaining %zd",
683 frag_len, remaining_len);
684
685 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
686 frag_len + LLCP_SEQUENCE_SIZE);
687 if (pdu == NULL) {
688 kfree(msg_data);
689 return -ENOMEM;
690 }
691
692 skb_put(pdu, LLCP_SEQUENCE_SIZE);
693
694 if (likely(frag_len > 0))
695 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
696
697 skb_queue_tail(&sock->tx_queue, pdu);
698
699 lock_sock(sk);
700
701 nfc_llcp_queue_i_frames(sock);
702
703 release_sock(sk);
704
705 remaining_len -= frag_len;
706 msg_ptr += frag_len;
707 } while (remaining_len > 0);
708
709 kfree(msg_data);
710
711 return len;
712 }
713
nfc_llcp_send_ui_frame(struct nfc_llcp_sock * sock,u8 ssap,u8 dsap,struct msghdr * msg,size_t len)714 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
715 struct msghdr *msg, size_t len)
716 {
717 struct sk_buff *pdu;
718 struct nfc_llcp_local *local;
719 size_t frag_len = 0, remaining_len;
720 u8 *msg_ptr, *msg_data;
721 u16 remote_miu;
722 int err;
723
724 pr_debug("Send UI frame len %zd\n", len);
725
726 local = sock->local;
727 if (local == NULL)
728 return -ENODEV;
729
730 msg_data = kzalloc(len, GFP_KERNEL);
731 if (msg_data == NULL)
732 return -ENOMEM;
733
734 if (memcpy_fromiovec(msg_data, msg->msg_iov, len)) {
735 kfree(msg_data);
736 return -EFAULT;
737 }
738
739 remaining_len = len;
740 msg_ptr = msg_data;
741
742 do {
743 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
744 local->remote_miu : sock->remote_miu;
745
746 frag_len = min_t(size_t, remote_miu, remaining_len);
747
748 pr_debug("Fragment %zd bytes remaining %zd",
749 frag_len, remaining_len);
750
751 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
752 frag_len + LLCP_HEADER_SIZE, &err);
753 if (pdu == NULL) {
754 pr_err("Could not allocate PDU\n");
755 continue;
756 }
757
758 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
759
760 if (likely(frag_len > 0))
761 memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
762
763 /* No need to check for the peer RW for UI frames */
764 skb_queue_tail(&local->tx_queue, pdu);
765
766 remaining_len -= frag_len;
767 msg_ptr += frag_len;
768 } while (remaining_len > 0);
769
770 kfree(msg_data);
771
772 return len;
773 }
774
nfc_llcp_send_rr(struct nfc_llcp_sock * sock)775 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
776 {
777 struct sk_buff *skb;
778 struct nfc_llcp_local *local;
779
780 pr_debug("Send rr nr %d\n", sock->recv_n);
781
782 local = sock->local;
783 if (local == NULL)
784 return -ENODEV;
785
786 skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
787 if (skb == NULL)
788 return -ENOMEM;
789
790 skb_put(skb, LLCP_SEQUENCE_SIZE);
791
792 skb->data[2] = sock->recv_n;
793
794 skb_queue_head(&local->tx_queue, skb);
795
796 return 0;
797 }
798