~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ 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-3.16.72 ] ~ [ 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 ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
 54 static u16 llcp_tlv16(u8 *tlv, u8 type)
 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 {
 70         return llcp_tlv16(tlv, LLCP_TLV_MIUX) & 0x7ff;
 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;
105         else if (length == 0)
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 
120 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdres_tlv(u8 tid, u8 sap)
121 {
122         struct nfc_llcp_sdp_tlv *sdres;
123         u8 value[2];
124 
125         sdres = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
126         if (sdres == NULL)
127                 return NULL;
128 
129         value[0] = tid;
130         value[1] = sap;
131 
132         sdres->tlv = nfc_llcp_build_tlv(LLCP_TLV_SDRES, value, 2,
133                                         &sdres->tlv_len);
134         if (sdres->tlv == NULL) {
135                 kfree(sdres);
136                 return NULL;
137         }
138 
139         sdres->tid = tid;
140         sdres->sap = sap;
141 
142         INIT_HLIST_NODE(&sdres->node);
143 
144         return sdres;
145 }
146 
147 struct nfc_llcp_sdp_tlv *nfc_llcp_build_sdreq_tlv(u8 tid, char *uri,
148                                                   size_t uri_len)
149 {
150         struct nfc_llcp_sdp_tlv *sdreq;
151 
152         pr_debug("uri: %s, len: %zu\n", uri, uri_len);
153 
154         sdreq = kzalloc(sizeof(struct nfc_llcp_sdp_tlv), GFP_KERNEL);
155         if (sdreq == NULL)
156                 return NULL;
157 
158         sdreq->tlv_len = uri_len + 3;
159 
160         if (uri[uri_len - 1] == 0)
161                 sdreq->tlv_len--;
162 
163         sdreq->tlv = kzalloc(sdreq->tlv_len + 1, GFP_KERNEL);
164         if (sdreq->tlv == NULL) {
165                 kfree(sdreq);
166                 return NULL;
167         }
168 
169         sdreq->tlv[0] = LLCP_TLV_SDREQ;
170         sdreq->tlv[1] = sdreq->tlv_len - 2;
171         sdreq->tlv[2] = tid;
172 
173         sdreq->tid = tid;
174         sdreq->uri = sdreq->tlv + 3;
175         memcpy(sdreq->uri, uri, uri_len);
176 
177         sdreq->time = jiffies;
178 
179         INIT_HLIST_NODE(&sdreq->node);
180 
181         return sdreq;
182 }
183 
184 void nfc_llcp_free_sdp_tlv(struct nfc_llcp_sdp_tlv *sdp)
185 {
186         kfree(sdp->tlv);
187         kfree(sdp);
188 }
189 
190 void nfc_llcp_free_sdp_tlv_list(struct hlist_head *head)
191 {
192         struct nfc_llcp_sdp_tlv *sdp;
193         struct hlist_node *n;
194 
195         hlist_for_each_entry_safe(sdp, n, head, node) {
196                 hlist_del(&sdp->node);
197 
198                 nfc_llcp_free_sdp_tlv(sdp);
199         }
200 }
201 
202 int nfc_llcp_parse_gb_tlv(struct nfc_llcp_local *local,
203                           u8 *tlv_array, u16 tlv_array_len)
204 {
205         u8 *tlv = tlv_array, type, length, offset = 0;
206 
207         pr_debug("TLV array length %d\n", tlv_array_len);
208 
209         if (local == NULL)
210                 return -ENODEV;
211 
212         while (offset < tlv_array_len) {
213                 type = tlv[0];
214                 length = tlv[1];
215 
216                 pr_debug("type 0x%x length %d\n", type, length);
217 
218                 switch (type) {
219                 case LLCP_TLV_VERSION:
220                         local->remote_version = llcp_tlv_version(tlv);
221                         break;
222                 case LLCP_TLV_MIUX:
223                         local->remote_miu = llcp_tlv_miux(tlv) + 128;
224                         break;
225                 case LLCP_TLV_WKS:
226                         local->remote_wks = llcp_tlv_wks(tlv);
227                         break;
228                 case LLCP_TLV_LTO:
229                         local->remote_lto = llcp_tlv_lto(tlv) * 10;
230                         break;
231                 case LLCP_TLV_OPT:
232                         local->remote_opt = llcp_tlv_opt(tlv);
233                         break;
234                 default:
235                         pr_err("Invalid gt tlv value 0x%x\n", type);
236                         break;
237                 }
238 
239                 offset += length + 2;
240                 tlv += length + 2;
241         }
242 
243         pr_debug("version 0x%x miu %d lto %d opt 0x%x wks 0x%x\n",
244                  local->remote_version, local->remote_miu,
245                  local->remote_lto, local->remote_opt,
246                  local->remote_wks);
247 
248         return 0;
249 }
250 
251 int nfc_llcp_parse_connection_tlv(struct nfc_llcp_sock *sock,
252                                   u8 *tlv_array, u16 tlv_array_len)
253 {
254         u8 *tlv = tlv_array, type, length, offset = 0;
255 
256         pr_debug("TLV array length %d\n", tlv_array_len);
257 
258         if (sock == NULL)
259                 return -ENOTCONN;
260 
261         while (offset < tlv_array_len) {
262                 type = tlv[0];
263                 length = tlv[1];
264 
265                 pr_debug("type 0x%x length %d\n", type, length);
266 
267                 switch (type) {
268                 case LLCP_TLV_MIUX:
269                         sock->remote_miu = llcp_tlv_miux(tlv) + 128;
270                         break;
271                 case LLCP_TLV_RW:
272                         sock->remote_rw = llcp_tlv_rw(tlv);
273                         break;
274                 case LLCP_TLV_SN:
275                         break;
276                 default:
277                         pr_err("Invalid gt tlv value 0x%x\n", type);
278                         break;
279                 }
280 
281                 offset += length + 2;
282                 tlv += length + 2;
283         }
284 
285         pr_debug("sock %p rw %d miu %d\n", sock,
286                  sock->remote_rw, sock->remote_miu);
287 
288         return 0;
289 }
290 
291 static struct sk_buff *llcp_add_header(struct sk_buff *pdu,
292                                        u8 dsap, u8 ssap, u8 ptype)
293 {
294         u8 header[2];
295 
296         pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
297 
298         header[0] = (u8)((dsap << 2) | (ptype >> 2));
299         header[1] = (u8)((ptype << 6) | ssap);
300 
301         pr_debug("header 0x%x 0x%x\n", header[0], header[1]);
302 
303         memcpy(skb_put(pdu, LLCP_HEADER_SIZE), header, LLCP_HEADER_SIZE);
304 
305         return pdu;
306 }
307 
308 static struct sk_buff *llcp_add_tlv(struct sk_buff *pdu, u8 *tlv,
309                                     u8 tlv_length)
310 {
311         /* XXX Add an skb length check */
312 
313         if (tlv == NULL)
314                 return NULL;
315 
316         memcpy(skb_put(pdu, tlv_length), tlv, tlv_length);
317 
318         return pdu;
319 }
320 
321 static struct sk_buff *llcp_allocate_pdu(struct nfc_llcp_sock *sock,
322                                          u8 cmd, u16 size)
323 {
324         struct sk_buff *skb;
325         int err;
326 
327         if (sock->ssap == 0)
328                 return NULL;
329 
330         skb = nfc_alloc_send_skb(sock->dev, &sock->sk, MSG_DONTWAIT,
331                                  size + LLCP_HEADER_SIZE, &err);
332         if (skb == NULL) {
333                 pr_err("Could not allocate PDU\n");
334                 return NULL;
335         }
336 
337         skb = llcp_add_header(skb, sock->dsap, sock->ssap, cmd);
338 
339         return skb;
340 }
341 
342 int nfc_llcp_send_disconnect(struct nfc_llcp_sock *sock)
343 {
344         struct sk_buff *skb;
345         struct nfc_dev *dev;
346         struct nfc_llcp_local *local;
347 
348         pr_debug("Sending DISC\n");
349 
350         local = sock->local;
351         if (local == NULL)
352                 return -ENODEV;
353 
354         dev = sock->dev;
355         if (dev == NULL)
356                 return -ENODEV;
357 
358         skb = llcp_allocate_pdu(sock, LLCP_PDU_DISC, 0);
359         if (skb == NULL)
360                 return -ENOMEM;
361 
362         skb_queue_tail(&local->tx_queue, skb);
363 
364         return 0;
365 }
366 
367 int nfc_llcp_send_symm(struct nfc_dev *dev)
368 {
369         struct sk_buff *skb;
370         struct nfc_llcp_local *local;
371         u16 size = 0;
372 
373         pr_debug("Sending SYMM\n");
374 
375         local = nfc_llcp_find_local(dev);
376         if (local == NULL)
377                 return -ENODEV;
378 
379         size += LLCP_HEADER_SIZE;
380         size += dev->tx_headroom + dev->tx_tailroom + NFC_HEADER_SIZE;
381 
382         skb = alloc_skb(size, GFP_KERNEL);
383         if (skb == NULL)
384                 return -ENOMEM;
385 
386         skb_reserve(skb, dev->tx_headroom + NFC_HEADER_SIZE);
387 
388         skb = llcp_add_header(skb, 0, 0, LLCP_PDU_SYMM);
389 
390         __net_timestamp(skb);
391 
392         nfc_llcp_send_to_raw_sock(local, skb, NFC_LLCP_DIRECTION_TX);
393 
394         return nfc_data_exchange(dev, local->target_idx, skb,
395                                  nfc_llcp_recv, local);
396 }
397 
398 int nfc_llcp_send_connect(struct nfc_llcp_sock *sock)
399 {
400         struct nfc_llcp_local *local;
401         struct sk_buff *skb;
402         u8 *service_name_tlv = NULL, service_name_tlv_length;
403         u8 *miux_tlv = NULL, miux_tlv_length;
404         u8 *rw_tlv = NULL, rw_tlv_length, rw;
405         int err;
406         u16 size = 0, miux;
407 
408         pr_debug("Sending CONNECT\n");
409 
410         local = sock->local;
411         if (local == NULL)
412                 return -ENODEV;
413 
414         if (sock->service_name != NULL) {
415                 service_name_tlv = nfc_llcp_build_tlv(LLCP_TLV_SN,
416                                                       sock->service_name,
417                                                       sock->service_name_len,
418                                                       &service_name_tlv_length);
419                 size += service_name_tlv_length;
420         }
421 
422         /* If the socket parameters are not set, use the local ones */
423         miux = be16_to_cpu(sock->miux) > LLCP_MAX_MIUX ?
424                 local->miux : sock->miux;
425         rw = sock->rw > LLCP_MAX_RW ? local->rw : sock->rw;
426 
427         miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&miux, 0,
428                                       &miux_tlv_length);
429         size += miux_tlv_length;
430 
431         rw_tlv = nfc_llcp_build_tlv(LLCP_TLV_RW, &rw, 0, &rw_tlv_length);
432         size += rw_tlv_length;
433 
434         pr_debug("SKB size %d SN length %zu\n", size, sock->service_name_len);
435 
436         skb = llcp_allocate_pdu(sock, LLCP_PDU_CONNECT, size);
437         if (skb == NULL) {
438                 err = -ENOMEM;
439                 goto error_tlv;
440         }
441 
442         if (service_name_tlv != NULL)
443                 skb = llcp_add_tlv(skb, service_name_tlv,
444                                    service_name_tlv_length);
445 
446         skb = llcp_add_tlv(skb, miux_tlv, miux_tlv_length);
447         skb = llcp_add_tlv(skb, rw_tlv, rw_tlv_length);
448 
449         skb_queue_tail(&local->tx_queue, skb);
450 
451         return 0;
452 
453 error_tlv:
454         pr_err("error %d\n", err);
455 
456         kfree(service_name_tlv);
457         kfree(miux_tlv);
458         kfree(rw_tlv);
459 
460         return err;
461 }
462 
463 int nfc_llcp_send_cc(struct nfc_llcp_sock *sock)
464 {
465         struct nfc_llcp_local *local;
466         struct sk_buff *skb;
467         u8 *miux_tlv = NULL, miux_tlv_length;
468         u8 *rw_tlv = NULL, rw_tlv_length, rw;
469         int err;
470         u16 size = 0, 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_fromiovec(msg_data, msg->msg_iov, 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                                 local->remote_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                         return -ENOMEM;
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 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp