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TOMOYO Linux Cross Reference
Linux/net/nfc/llcp_commands.c

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  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 
 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 
 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 
 61 static u8 llcp_tlv_version(u8 *tlv)
 62 {
 63         return llcp_tlv8(tlv, LLCP_TLV_VERSION);
 64 }
 65 
 66 static u16 llcp_tlv_miux(u8 *tlv)
 67 {
 68         return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
 69 }
 70 
 71 static u16 llcp_tlv_wks(u8 *tlv)
 72 {
 73         return llcp_tlv16(tlv, LLCP_TLV_WKS);
 74 }
 75 
 76 static u16 llcp_tlv_lto(u8 *tlv)
 77 {
 78         return llcp_tlv8(tlv, LLCP_TLV_LTO);
 79 }
 80 
 81 static u8 llcp_tlv_opt(u8 *tlv)
 82 {
 83         return llcp_tlv8(tlv, LLCP_TLV_OPT);
 84 }
 85 
 86 static u8 llcp_tlv_rw(u8 *tlv)
 87 {
 88         return llcp_tlv8(tlv, LLCP_TLV_RW) & 0xf;
 89 }
 90 
 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 
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 
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 
182 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
183 {
184         kfree(sdp->tlv);
185         kfree(sdp);
186 }
187 
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 
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 
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 
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 
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 
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 
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 
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 
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;
405         __be16 miux;
406 
407         pr_debug("Sending CONNECT\n");
408 
409         local = sock->local;
410         if (local == NULL)
411                 return -ENODEV;
412 
413         if (sock->service_name != NULL) {
414                 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
415                                                       sock->service_name,
416                                                       sock->service_name_len,
417                                                       &service_name_tlv_length);
418                 size += service_name_tlv_length;
419         }
420 
421         /* If the socket parameters are not set, use the local ones */
422         miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
423                 local->miux : sock->miux;
424         rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
425 
426         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
427                                       &miux_tlv_length);
428         size += miux_tlv_length;
429 
430         rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
431         size += rw_tlv_length;
432 
433         pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
434 
435         skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
436         if (skb == NULL) {
437                 err = -ENOMEM;
438                 goto error_tlv;
439         }
440 
441         if (service_name_tlv != NULL)
442                 skb = llcp_add_tlv(skb, service_name_tlv,
443                                    service_name_tlv_length);
444 
445         skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
446         skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
447 
448         skb_queue_tail(&local->tx_queue, skb);
449 
450         return 0;
451 
452 error_tlv:
453         pr_err("error %d\n", err);
454 
455         kfree(service_name_tlv);
456         kfree(miux_tlv);
457         kfree(rw_tlv);
458 
459         return err;
460 }
461 
462 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
463 {
464         struct nfc_llcp_local *local;
465         struct sk_buff *skb;
466         u8 *miux_tlv = NULL, miux_tlv_length;
467         u8 *rw_tlv = NULL, rw_tlv_length, rw;
468         int err;
469         u16 size = 0;
470         __be16 miux;
471 
472         pr_debug("Sending CC\n");
473 
474         local = sock->local;
475         if (local == NULL)
476                 return -ENODEV;
477 
478         /* If the socket parameters are not set, use the local ones */
479         miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
480                 local->miux : sock->miux;
481         rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
482 
483         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
484                                       &miux_tlv_length);
485         size += miux_tlv_length;
486 
487         rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
488         size += rw_tlv_length;
489 
490         skb = llcp_allocate_pdu(sock, LLCP_PDU_CC, size);
491         if (skb == NULL) {
492                 err = -ENOMEM;
493                 goto error_tlv;
494         }
495 
496         skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
497         skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
498 
499         skb_queue_tail(&local->tx_queue, skb);
500 
501         return 0;
502 
503 error_tlv:
504         pr_err("error %d\n", err);
505 
506         kfree(miux_tlv);
507         kfree(rw_tlv);
508 
509         return err;
510 }
511 
512 static struct sk_buff *nfc_llcp_allocate_snl(struct nfc_llcp_local *local,
513                                              size_t tlv_length)
514 {
515         struct sk_buff *skb;
516         struct nfc_dev *dev;
517         u16 size = 0;
518 
519         if (local == NULL)
520                 return ERR_PTR(-ENODEV);
521 
522         dev = local->dev;
523         if (dev == NULL)
524                 return ERR_PTR(-ENODEV);
525 
526         size += LLCP_HEADER_SIZE;
527         size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
528         size += tlv_length;
529 
530         skb = alloc_skb(size, GFP_KERNEL);
531         if (skb == NULL)
532                 return ERR_PTR(-ENOMEM);
533 
534         skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
535 
536         skb = llcp_add_header(skb, LLCP_SAP_SDP, LLCP_SAP_SDP, LLCP_PDU_SNL);
537 
538         return skb;
539 }
540 
541 int nfc_llcp_send_snl_sdres(struct nfc_llcp_local *local,
542                             struct hlist_head *tlv_list, size_t tlvs_len)
543 {
544         struct nfc_llcp_sdp_tlv *sdp;
545         struct hlist_node *n;
546         struct sk_buff *skb;
547 
548         skb = nfc_llcp_allocate_snl(local, tlvs_len);
549         if (IS_ERR(skb))
550                 return PTR_ERR(skb);
551 
552         hlist_for_each_entry_safe(sdp, n, tlv_list, node) {
553                 memcpy(skb_put(skb, sdp->tlv_len), sdp->tlv, sdp->tlv_len);
554 
555                 hlist_del(&sdp->node);
556 
557                 nfc_llcp_free_sdp_tlv(sdp);
558         }
559 
560         skb_queue_tail(&local->tx_queue, skb);
561 
562         return 0;
563 }
564 
565 int nfc_llcp_send_snl_sdreq(struct nfc_llcp_local *local,
566                             struct hlist_head *tlv_list, size_t tlvs_len)
567 {
568         struct nfc_llcp_sdp_tlv *sdreq;
569         struct hlist_node *n;
570         struct sk_buff *skb;
571 
572         skb = nfc_llcp_allocate_snl(local, tlvs_len);
573         if (IS_ERR(skb))
574                 return PTR_ERR(skb);
575 
576         mutex_lock(&local->sdreq_lock);
577 
578         if (hlist_empty(&local->pending_sdreqs))
579                 mod_timer(&local->sdreq_timer,
580                           jiffies + msecs_to_jiffies(3 * local->remote_lto));
581 
582         hlist_for_each_entry_safe(sdreq, n, tlv_list, node) {
583                 pr_debug("tid %d for %s\n", sdreq->tid, sdreq->uri);
584 
585                 memcpy(skb_put(skb, sdreq->tlv_len), sdreq->tlv,
586                        sdreq->tlv_len);
587 
588                 hlist_del(&sdreq->node);
589 
590                 hlist_add_head(&sdreq->node, &local->pending_sdreqs);
591         }
592 
593         mutex_unlock(&local->sdreq_lock);
594 
595         skb_queue_tail(&local->tx_queue, skb);
596 
597         return 0;
598 }
599 
600 int nfc_llcp_send_dm(struct nfc_llcp_local *local, u8 ssap, u8 dsap, u8 reason)
601 {
602         struct sk_buff *skb;
603         struct nfc_dev *dev;
604         u16 size = 1; /* Reason code */
605 
606         pr_debug("Sending DM reason 0x%x\n", reason);
607 
608         if (local == NULL)
609                 return -ENODEV;
610 
611         dev = local->dev;
612         if (dev == NULL)
613                 return -ENODEV;
614 
615         size += LLCP_HEADER_SIZE;
616         size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
617 
618         skb = alloc_skb(size, GFP_KERNEL);
619         if (skb == NULL)
620                 return -ENOMEM;
621 
622         skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
623 
624         skb = llcp_add_header(skb, dsap, ssap, LLCP_PDU_DM);
625 
626         memcpy(skb_put(skb, 1), &reason, 1);
627 
628         skb_queue_head(&local->tx_queue, skb);
629 
630         return 0;
631 }
632 
633 int nfc_llcp_send_i_frame(struct nfc_llcp_sock *sock,
634                           struct msghdr *msg, size_t len)
635 {
636         struct sk_buff *pdu;
637         struct sock *sk = &sock->sk;
638         struct nfc_llcp_local *local;
639         size_t frag_len = 0, remaining_len;
640         u8 *msg_data, *msg_ptr;
641         u16 remote_miu;
642 
643         pr_debug("Send I frame len %zd\n", len);
644 
645         local = sock->local;
646         if (local == NULL)
647                 return -ENODEV;
648 
649         /* Remote is ready but has not acknowledged our frames */
650         if((sock->remote_ready &&
651             skb_queue_len(&sock->tx_pending_queue) >= sock->remote_rw &&
652             skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
653                 pr_err("Pending queue is full %d frames\n",
654                        skb_queue_len(&sock->tx_pending_queue));
655                 return -ENOBUFS;
656         }
657 
658         /* Remote is not ready and we've been queueing enough frames */
659         if ((!sock->remote_ready &&
660              skb_queue_len(&sock->tx_queue) >= 2 * sock->remote_rw)) {
661                 pr_err("Tx queue is full %d frames\n",
662                        skb_queue_len(&sock->tx_queue));
663                 return -ENOBUFS;
664         }
665 
666         msg_data = kzalloc(len, GFP_KERNEL);
667         if (msg_data == NULL)
668                 return -ENOMEM;
669 
670         if (memcpy_from_msg(msg_data, msg, len)) {
671                 kfree(msg_data);
672                 return -EFAULT;
673         }
674 
675         remaining_len = len;
676         msg_ptr = msg_data;
677 
678         do {
679                 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
680                                 LLCP_DEFAULT_MIU : sock->remote_miu;
681 
682                 frag_len = min_t(size_t, remote_miu, remaining_len);
683 
684                 pr_debug("Fragment %zd bytes remaining %zd",
685                          frag_len, remaining_len);
686 
687                 pdu = llcp_allocate_pdu(sock, LLCP_PDU_I,
688                                         frag_len + LLCP_SEQUENCE_SIZE);
689                 if (pdu == NULL) {
690                         kfree(msg_data);
691                         return -ENOMEM;
692                 }
693 
694                 skb_put(pdu, LLCP_SEQUENCE_SIZE);
695 
696                 if (likely(frag_len > 0))
697                         memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
698 
699                 skb_queue_tail(&sock->tx_queue, pdu);
700 
701                 lock_sock(sk);
702 
703                 nfc_llcp_queue_i_frames(sock);
704 
705                 release_sock(sk);
706 
707                 remaining_len -= frag_len;
708                 msg_ptr += frag_len;
709         } while (remaining_len > 0);
710 
711         kfree(msg_data);
712 
713         return len;
714 }
715 
716 int nfc_llcp_send_ui_frame(struct nfc_llcp_sock *sock, u8 ssap, u8 dsap,
717                            struct msghdr *msg, size_t len)
718 {
719         struct sk_buff *pdu;
720         struct nfc_llcp_local *local;
721         size_t frag_len = 0, remaining_len;
722         u8 *msg_ptr, *msg_data;
723         u16 remote_miu;
724         int err;
725 
726         pr_debug("Send UI frame len %zd\n", len);
727 
728         local = sock->local;
729         if (local == NULL)
730                 return -ENODEV;
731 
732         msg_data = kzalloc(len, GFP_KERNEL);
733         if (msg_data == NULL)
734                 return -ENOMEM;
735 
736         if (memcpy_from_msg(msg_data, msg, len)) {
737                 kfree(msg_data);
738                 return -EFAULT;
739         }
740 
741         remaining_len = len;
742         msg_ptr = msg_data;
743 
744         do {
745                 remote_miu = sock->remote_miu > LLCP_MAX_MIU ?
746                                 local->remote_miu : sock->remote_miu;
747 
748                 frag_len = min_t(size_t, remote_miu, remaining_len);
749 
750                 pr_debug("Fragment %zd bytes remaining %zd",
751                          frag_len, remaining_len);
752 
753                 pdu = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
754                                          frag_len + LLCP_HEADER_SIZE, &err);
755                 if (pdu == NULL) {
756                         pr_err("Could not allocate PDU\n");
757                         continue;
758                 }
759 
760                 pdu = llcp_add_header(pdu, dsap, ssap, LLCP_PDU_UI);
761 
762                 if (likely(frag_len > 0))
763                         memcpy(skb_put(pdu, frag_len), msg_ptr, frag_len);
764 
765                 /* No need to check for the peer RW for UI frames */
766                 skb_queue_tail(&local->tx_queue, pdu);
767 
768                 remaining_len -= frag_len;
769                 msg_ptr += frag_len;
770         } while (remaining_len > 0);
771 
772         kfree(msg_data);
773 
774         return len;
775 }
776 
777 int nfc_llcp_send_rr(struct nfc_llcp_sock *sock)
778 {
779         struct sk_buff *skb;
780         struct nfc_llcp_local *local;
781 
782         pr_debug("Send rr nr %d\n", sock->recv_n);
783 
784         local = sock->local;
785         if (local == NULL)
786                 return -ENODEV;
787 
788         skb = llcp_allocate_pdu(sock, LLCP_PDU_RR, LLCP_SEQUENCE_SIZE);
789         if (skb == NULL)
790                 return -ENOMEM;
791 
792         skb_put(skb, LLCP_SEQUENCE_SIZE);
793 
794         skb->data[2] = sock->recv_n;
795 
796         skb_queue_head(&local->tx_queue, skb);
797 
798         return 0;
799 }
800 

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