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

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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_LLCP_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, 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 
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 
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 
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 
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 
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 
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 
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 
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 

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