1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2011 Instituto Nokia de Tecnologia
4 *
5 * Authors:
6 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
7 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
8 *
9 * Vendor commands implementation based on net/wireless/nl80211.c
10 * which is:
11 *
12 * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
13 * Copyright 2013-2014 Intel Mobile Communications GmbH
14 */
15
16 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
17
18 #include <net/genetlink.h>
19 #include <linux/nfc.h>
20 #include <linux/slab.h>
21
22 #include "nfc.h"
23 #include "llcp.h"
24
25 static const struct genl_multicast_group nfc_genl_mcgrps[] = {
26 { .name = NFC_GENL_MCAST_EVENT_NAME, },
27 };
28
29 static struct genl_family nfc_genl_family;
30 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
31 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
32 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
33 .len = NFC_DEVICE_NAME_MAXSIZE },
34 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
35 [NFC_ATTR_TARGET_INDEX] = { .type = NLA_U32 },
36 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
37 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
38 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
39 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
40 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
41 [NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
42 [NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
43 [NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
44 [NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
45 [NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
46 .len = NFC_FIRMWARE_NAME_MAXSIZE },
47 [NFC_ATTR_SE_INDEX] = { .type = NLA_U32 },
48 [NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
49 [NFC_ATTR_VENDOR_ID] = { .type = NLA_U32 },
50 [NFC_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
51 [NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
52
53 };
54
55 static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
56 [NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
57 .len = U8_MAX - 4 },
58 [NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
59 };
60
nfc_genl_send_target(struct sk_buff * msg,struct nfc_target * target,struct netlink_callback * cb,int flags)61 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
62 struct netlink_callback *cb, int flags)
63 {
64 void *hdr;
65
66 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
67 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
68 if (!hdr)
69 return -EMSGSIZE;
70
71 genl_dump_check_consistent(cb, hdr);
72
73 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
74 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
75 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
76 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
77 goto nla_put_failure;
78 if (target->nfcid1_len > 0 &&
79 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
80 target->nfcid1))
81 goto nla_put_failure;
82 if (target->sensb_res_len > 0 &&
83 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
84 target->sensb_res))
85 goto nla_put_failure;
86 if (target->sensf_res_len > 0 &&
87 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
88 target->sensf_res))
89 goto nla_put_failure;
90
91 if (target->is_iso15693) {
92 if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
93 target->iso15693_dsfid) ||
94 nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
95 sizeof(target->iso15693_uid), target->iso15693_uid))
96 goto nla_put_failure;
97 }
98
99 genlmsg_end(msg, hdr);
100 return 0;
101
102 nla_put_failure:
103 genlmsg_cancel(msg, hdr);
104 return -EMSGSIZE;
105 }
106
__get_device_from_cb(struct netlink_callback * cb)107 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
108 {
109 const struct genl_dumpit_info *info = genl_dumpit_info(cb);
110 struct nfc_dev *dev;
111 u32 idx;
112
113 if (!info->info.attrs[NFC_ATTR_DEVICE_INDEX])
114 return ERR_PTR(-EINVAL);
115
116 idx = nla_get_u32(info->info.attrs[NFC_ATTR_DEVICE_INDEX]);
117
118 dev = nfc_get_device(idx);
119 if (!dev)
120 return ERR_PTR(-ENODEV);
121
122 return dev;
123 }
124
nfc_genl_dump_targets(struct sk_buff * skb,struct netlink_callback * cb)125 static int nfc_genl_dump_targets(struct sk_buff *skb,
126 struct netlink_callback *cb)
127 {
128 int i = cb->args[0];
129 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
130 int rc;
131
132 if (!dev) {
133 dev = __get_device_from_cb(cb);
134 if (IS_ERR(dev))
135 return PTR_ERR(dev);
136
137 cb->args[1] = (long) dev;
138 }
139
140 device_lock(&dev->dev);
141
142 cb->seq = dev->targets_generation;
143
144 while (i < dev->n_targets) {
145 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
146 NLM_F_MULTI);
147 if (rc < 0)
148 break;
149
150 i++;
151 }
152
153 device_unlock(&dev->dev);
154
155 cb->args[0] = i;
156
157 return skb->len;
158 }
159
nfc_genl_dump_targets_done(struct netlink_callback * cb)160 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
161 {
162 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
163
164 if (dev)
165 nfc_put_device(dev);
166
167 return 0;
168 }
169
nfc_genl_targets_found(struct nfc_dev * dev)170 int nfc_genl_targets_found(struct nfc_dev *dev)
171 {
172 struct sk_buff *msg;
173 void *hdr;
174
175 dev->genl_data.poll_req_portid = 0;
176
177 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
178 if (!msg)
179 return -ENOMEM;
180
181 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
182 NFC_EVENT_TARGETS_FOUND);
183 if (!hdr)
184 goto free_msg;
185
186 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
187 goto nla_put_failure;
188
189 genlmsg_end(msg, hdr);
190
191 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
192
193 nla_put_failure:
194 free_msg:
195 nlmsg_free(msg);
196 return -EMSGSIZE;
197 }
198
nfc_genl_target_lost(struct nfc_dev * dev,u32 target_idx)199 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
200 {
201 struct sk_buff *msg;
202 void *hdr;
203
204 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
205 if (!msg)
206 return -ENOMEM;
207
208 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
209 NFC_EVENT_TARGET_LOST);
210 if (!hdr)
211 goto free_msg;
212
213 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
214 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
215 goto nla_put_failure;
216
217 genlmsg_end(msg, hdr);
218
219 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
220
221 return 0;
222
223 nla_put_failure:
224 free_msg:
225 nlmsg_free(msg);
226 return -EMSGSIZE;
227 }
228
nfc_genl_tm_activated(struct nfc_dev * dev,u32 protocol)229 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
230 {
231 struct sk_buff *msg;
232 void *hdr;
233
234 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
235 if (!msg)
236 return -ENOMEM;
237
238 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
239 NFC_EVENT_TM_ACTIVATED);
240 if (!hdr)
241 goto free_msg;
242
243 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
244 goto nla_put_failure;
245 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
246 goto nla_put_failure;
247
248 genlmsg_end(msg, hdr);
249
250 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
251
252 return 0;
253
254 nla_put_failure:
255 free_msg:
256 nlmsg_free(msg);
257 return -EMSGSIZE;
258 }
259
nfc_genl_tm_deactivated(struct nfc_dev * dev)260 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
261 {
262 struct sk_buff *msg;
263 void *hdr;
264
265 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
266 if (!msg)
267 return -ENOMEM;
268
269 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
270 NFC_EVENT_TM_DEACTIVATED);
271 if (!hdr)
272 goto free_msg;
273
274 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
275 goto nla_put_failure;
276
277 genlmsg_end(msg, hdr);
278
279 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
280
281 return 0;
282
283 nla_put_failure:
284 free_msg:
285 nlmsg_free(msg);
286 return -EMSGSIZE;
287 }
288
nfc_genl_setup_device_added(struct nfc_dev * dev,struct sk_buff * msg)289 static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
290 {
291 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
292 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
293 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
294 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
295 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
296 return -1;
297 return 0;
298 }
299
nfc_genl_device_added(struct nfc_dev * dev)300 int nfc_genl_device_added(struct nfc_dev *dev)
301 {
302 struct sk_buff *msg;
303 void *hdr;
304
305 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
306 if (!msg)
307 return -ENOMEM;
308
309 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
310 NFC_EVENT_DEVICE_ADDED);
311 if (!hdr)
312 goto free_msg;
313
314 if (nfc_genl_setup_device_added(dev, msg))
315 goto nla_put_failure;
316
317 genlmsg_end(msg, hdr);
318
319 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
320
321 return 0;
322
323 nla_put_failure:
324 free_msg:
325 nlmsg_free(msg);
326 return -EMSGSIZE;
327 }
328
nfc_genl_device_removed(struct nfc_dev * dev)329 int nfc_genl_device_removed(struct nfc_dev *dev)
330 {
331 struct sk_buff *msg;
332 void *hdr;
333
334 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
335 if (!msg)
336 return -ENOMEM;
337
338 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
339 NFC_EVENT_DEVICE_REMOVED);
340 if (!hdr)
341 goto free_msg;
342
343 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
344 goto nla_put_failure;
345
346 genlmsg_end(msg, hdr);
347
348 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
349
350 return 0;
351
352 nla_put_failure:
353 free_msg:
354 nlmsg_free(msg);
355 return -EMSGSIZE;
356 }
357
nfc_genl_llc_send_sdres(struct nfc_dev * dev,struct hlist_head * sdres_list)358 int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
359 {
360 struct sk_buff *msg;
361 struct nlattr *sdp_attr, *uri_attr;
362 struct nfc_llcp_sdp_tlv *sdres;
363 struct hlist_node *n;
364 void *hdr;
365 int rc = -EMSGSIZE;
366 int i;
367
368 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
369 if (!msg)
370 return -ENOMEM;
371
372 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
373 NFC_EVENT_LLC_SDRES);
374 if (!hdr)
375 goto free_msg;
376
377 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
378 goto nla_put_failure;
379
380 sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP);
381 if (sdp_attr == NULL) {
382 rc = -ENOMEM;
383 goto nla_put_failure;
384 }
385
386 i = 1;
387 hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
388 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
389
390 uri_attr = nla_nest_start_noflag(msg, i++);
391 if (uri_attr == NULL) {
392 rc = -ENOMEM;
393 goto nla_put_failure;
394 }
395
396 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
397 goto nla_put_failure;
398
399 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
400 goto nla_put_failure;
401
402 nla_nest_end(msg, uri_attr);
403
404 hlist_del(&sdres->node);
405
406 nfc_llcp_free_sdp_tlv(sdres);
407 }
408
409 nla_nest_end(msg, sdp_attr);
410
411 genlmsg_end(msg, hdr);
412
413 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
414
415 nla_put_failure:
416 free_msg:
417 nlmsg_free(msg);
418
419 nfc_llcp_free_sdp_tlv_list(sdres_list);
420
421 return rc;
422 }
423
nfc_genl_se_added(struct nfc_dev * dev,u32 se_idx,u16 type)424 int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
425 {
426 struct sk_buff *msg;
427 void *hdr;
428
429 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
430 if (!msg)
431 return -ENOMEM;
432
433 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
434 NFC_EVENT_SE_ADDED);
435 if (!hdr)
436 goto free_msg;
437
438 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
439 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
440 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
441 goto nla_put_failure;
442
443 genlmsg_end(msg, hdr);
444
445 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
446
447 return 0;
448
449 nla_put_failure:
450 free_msg:
451 nlmsg_free(msg);
452 return -EMSGSIZE;
453 }
454
nfc_genl_se_removed(struct nfc_dev * dev,u32 se_idx)455 int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
456 {
457 struct sk_buff *msg;
458 void *hdr;
459
460 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
461 if (!msg)
462 return -ENOMEM;
463
464 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
465 NFC_EVENT_SE_REMOVED);
466 if (!hdr)
467 goto free_msg;
468
469 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
470 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
471 goto nla_put_failure;
472
473 genlmsg_end(msg, hdr);
474
475 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
476
477 return 0;
478
479 nla_put_failure:
480 free_msg:
481 nlmsg_free(msg);
482 return -EMSGSIZE;
483 }
484
nfc_genl_se_transaction(struct nfc_dev * dev,u8 se_idx,struct nfc_evt_transaction * evt_transaction)485 int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
486 struct nfc_evt_transaction *evt_transaction)
487 {
488 struct nfc_se *se;
489 struct sk_buff *msg;
490 void *hdr;
491
492 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
493 if (!msg)
494 return -ENOMEM;
495
496 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
497 NFC_EVENT_SE_TRANSACTION);
498 if (!hdr)
499 goto free_msg;
500
501 se = nfc_find_se(dev, se_idx);
502 if (!se)
503 goto free_msg;
504
505 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
506 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
507 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
508 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
509 evt_transaction->aid) ||
510 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
511 evt_transaction->params))
512 goto nla_put_failure;
513
514 /* evt_transaction is no more used */
515 devm_kfree(&dev->dev, evt_transaction);
516
517 genlmsg_end(msg, hdr);
518
519 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
520
521 return 0;
522
523 nla_put_failure:
524 free_msg:
525 /* evt_transaction is no more used */
526 devm_kfree(&dev->dev, evt_transaction);
527 nlmsg_free(msg);
528 return -EMSGSIZE;
529 }
530
nfc_genl_se_connectivity(struct nfc_dev * dev,u8 se_idx)531 int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
532 {
533 const struct nfc_se *se;
534 struct sk_buff *msg;
535 void *hdr;
536
537 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
538 if (!msg)
539 return -ENOMEM;
540
541 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
542 NFC_EVENT_SE_CONNECTIVITY);
543 if (!hdr)
544 goto free_msg;
545
546 se = nfc_find_se(dev, se_idx);
547 if (!se)
548 goto free_msg;
549
550 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
551 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
552 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
553 goto nla_put_failure;
554
555 genlmsg_end(msg, hdr);
556
557 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
558
559 return 0;
560
561 nla_put_failure:
562 free_msg:
563 nlmsg_free(msg);
564 return -EMSGSIZE;
565 }
566
nfc_genl_send_device(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)567 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
568 u32 portid, u32 seq,
569 struct netlink_callback *cb,
570 int flags)
571 {
572 void *hdr;
573
574 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
575 NFC_CMD_GET_DEVICE);
576 if (!hdr)
577 return -EMSGSIZE;
578
579 if (cb)
580 genl_dump_check_consistent(cb, hdr);
581
582 if (nfc_genl_setup_device_added(dev, msg))
583 goto nla_put_failure;
584
585 genlmsg_end(msg, hdr);
586 return 0;
587
588 nla_put_failure:
589 genlmsg_cancel(msg, hdr);
590 return -EMSGSIZE;
591 }
592
nfc_genl_dump_devices(struct sk_buff * skb,struct netlink_callback * cb)593 static int nfc_genl_dump_devices(struct sk_buff *skb,
594 struct netlink_callback *cb)
595 {
596 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
597 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
598 bool first_call = false;
599
600 if (!iter) {
601 first_call = true;
602 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
603 if (!iter)
604 return -ENOMEM;
605 cb->args[0] = (long) iter;
606 }
607
608 mutex_lock(&nfc_devlist_mutex);
609
610 cb->seq = nfc_devlist_generation;
611
612 if (first_call) {
613 nfc_device_iter_init(iter);
614 dev = nfc_device_iter_next(iter);
615 }
616
617 while (dev) {
618 int rc;
619
620 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
621 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
622 if (rc < 0)
623 break;
624
625 dev = nfc_device_iter_next(iter);
626 }
627
628 mutex_unlock(&nfc_devlist_mutex);
629
630 cb->args[1] = (long) dev;
631
632 return skb->len;
633 }
634
nfc_genl_dump_devices_done(struct netlink_callback * cb)635 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
636 {
637 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
638
639 if (iter) {
640 nfc_device_iter_exit(iter);
641 kfree(iter);
642 }
643
644 return 0;
645 }
646
nfc_genl_dep_link_up_event(struct nfc_dev * dev,u32 target_idx,u8 comm_mode,u8 rf_mode)647 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
648 u8 comm_mode, u8 rf_mode)
649 {
650 struct sk_buff *msg;
651 void *hdr;
652
653 pr_debug("DEP link is up\n");
654
655 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
656 if (!msg)
657 return -ENOMEM;
658
659 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
660 if (!hdr)
661 goto free_msg;
662
663 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
664 goto nla_put_failure;
665 if (rf_mode == NFC_RF_INITIATOR &&
666 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
667 goto nla_put_failure;
668 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
669 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
670 goto nla_put_failure;
671
672 genlmsg_end(msg, hdr);
673
674 dev->dep_link_up = true;
675
676 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
677
678 return 0;
679
680 nla_put_failure:
681 free_msg:
682 nlmsg_free(msg);
683 return -EMSGSIZE;
684 }
685
nfc_genl_dep_link_down_event(struct nfc_dev * dev)686 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
687 {
688 struct sk_buff *msg;
689 void *hdr;
690
691 pr_debug("DEP link is down\n");
692
693 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
694 if (!msg)
695 return -ENOMEM;
696
697 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
698 NFC_CMD_DEP_LINK_DOWN);
699 if (!hdr)
700 goto free_msg;
701
702 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
703 goto nla_put_failure;
704
705 genlmsg_end(msg, hdr);
706
707 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
708
709 return 0;
710
711 nla_put_failure:
712 free_msg:
713 nlmsg_free(msg);
714 return -EMSGSIZE;
715 }
716
nfc_genl_get_device(struct sk_buff * skb,struct genl_info * info)717 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
718 {
719 struct sk_buff *msg;
720 struct nfc_dev *dev;
721 u32 idx;
722 int rc = -ENOBUFS;
723
724 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
725 return -EINVAL;
726
727 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
728
729 dev = nfc_get_device(idx);
730 if (!dev)
731 return -ENODEV;
732
733 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
734 if (!msg) {
735 rc = -ENOMEM;
736 goto out_putdev;
737 }
738
739 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
740 NULL, 0);
741 if (rc < 0)
742 goto out_free;
743
744 nfc_put_device(dev);
745
746 return genlmsg_reply(msg, info);
747
748 out_free:
749 nlmsg_free(msg);
750 out_putdev:
751 nfc_put_device(dev);
752 return rc;
753 }
754
nfc_genl_dev_up(struct sk_buff * skb,struct genl_info * info)755 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
756 {
757 struct nfc_dev *dev;
758 int rc;
759 u32 idx;
760
761 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
762 return -EINVAL;
763
764 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
765
766 dev = nfc_get_device(idx);
767 if (!dev)
768 return -ENODEV;
769
770 rc = nfc_dev_up(dev);
771
772 nfc_put_device(dev);
773 return rc;
774 }
775
nfc_genl_dev_down(struct sk_buff * skb,struct genl_info * info)776 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
777 {
778 struct nfc_dev *dev;
779 int rc;
780 u32 idx;
781
782 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
783 return -EINVAL;
784
785 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
786
787 dev = nfc_get_device(idx);
788 if (!dev)
789 return -ENODEV;
790
791 rc = nfc_dev_down(dev);
792
793 nfc_put_device(dev);
794 return rc;
795 }
796
nfc_genl_start_poll(struct sk_buff * skb,struct genl_info * info)797 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
798 {
799 struct nfc_dev *dev;
800 int rc;
801 u32 idx;
802 u32 im_protocols = 0, tm_protocols = 0;
803
804 pr_debug("Poll start\n");
805
806 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
807 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
808 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
809 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
810 return -EINVAL;
811
812 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
813
814 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
815 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
816
817 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
818 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
819 else if (info->attrs[NFC_ATTR_PROTOCOLS])
820 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
821
822 dev = nfc_get_device(idx);
823 if (!dev)
824 return -ENODEV;
825
826 mutex_lock(&dev->genl_data.genl_data_mutex);
827
828 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
829 if (!rc)
830 dev->genl_data.poll_req_portid = info->snd_portid;
831
832 mutex_unlock(&dev->genl_data.genl_data_mutex);
833
834 nfc_put_device(dev);
835 return rc;
836 }
837
nfc_genl_stop_poll(struct sk_buff * skb,struct genl_info * info)838 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
839 {
840 struct nfc_dev *dev;
841 int rc;
842 u32 idx;
843
844 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
845 return -EINVAL;
846
847 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
848
849 dev = nfc_get_device(idx);
850 if (!dev)
851 return -ENODEV;
852
853 device_lock(&dev->dev);
854
855 if (!dev->polling) {
856 device_unlock(&dev->dev);
857 nfc_put_device(dev);
858 return -EINVAL;
859 }
860
861 device_unlock(&dev->dev);
862
863 mutex_lock(&dev->genl_data.genl_data_mutex);
864
865 if (dev->genl_data.poll_req_portid != info->snd_portid) {
866 rc = -EBUSY;
867 goto out;
868 }
869
870 rc = nfc_stop_poll(dev);
871 dev->genl_data.poll_req_portid = 0;
872
873 out:
874 mutex_unlock(&dev->genl_data.genl_data_mutex);
875 nfc_put_device(dev);
876 return rc;
877 }
878
nfc_genl_activate_target(struct sk_buff * skb,struct genl_info * info)879 static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
880 {
881 struct nfc_dev *dev;
882 u32 device_idx, target_idx, protocol;
883 int rc;
884
885 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
886 !info->attrs[NFC_ATTR_TARGET_INDEX] ||
887 !info->attrs[NFC_ATTR_PROTOCOLS])
888 return -EINVAL;
889
890 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
891
892 dev = nfc_get_device(device_idx);
893 if (!dev)
894 return -ENODEV;
895
896 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
897 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
898
899 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
900 rc = nfc_activate_target(dev, target_idx, protocol);
901
902 nfc_put_device(dev);
903 return rc;
904 }
905
nfc_genl_deactivate_target(struct sk_buff * skb,struct genl_info * info)906 static int nfc_genl_deactivate_target(struct sk_buff *skb,
907 struct genl_info *info)
908 {
909 struct nfc_dev *dev;
910 u32 device_idx, target_idx;
911 int rc;
912
913 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
914 !info->attrs[NFC_ATTR_TARGET_INDEX])
915 return -EINVAL;
916
917 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
918
919 dev = nfc_get_device(device_idx);
920 if (!dev)
921 return -ENODEV;
922
923 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
924
925 rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
926
927 nfc_put_device(dev);
928 return rc;
929 }
930
nfc_genl_dep_link_up(struct sk_buff * skb,struct genl_info * info)931 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
932 {
933 struct nfc_dev *dev;
934 int rc, tgt_idx;
935 u32 idx;
936 u8 comm;
937
938 pr_debug("DEP link up\n");
939
940 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
941 !info->attrs[NFC_ATTR_COMM_MODE])
942 return -EINVAL;
943
944 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
945 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
946 tgt_idx = NFC_TARGET_IDX_ANY;
947 else
948 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
949
950 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
951
952 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
953 return -EINVAL;
954
955 dev = nfc_get_device(idx);
956 if (!dev)
957 return -ENODEV;
958
959 rc = nfc_dep_link_up(dev, tgt_idx, comm);
960
961 nfc_put_device(dev);
962
963 return rc;
964 }
965
nfc_genl_dep_link_down(struct sk_buff * skb,struct genl_info * info)966 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
967 {
968 struct nfc_dev *dev;
969 int rc;
970 u32 idx;
971
972 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
973 !info->attrs[NFC_ATTR_TARGET_INDEX])
974 return -EINVAL;
975
976 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
977
978 dev = nfc_get_device(idx);
979 if (!dev)
980 return -ENODEV;
981
982 rc = nfc_dep_link_down(dev);
983
984 nfc_put_device(dev);
985 return rc;
986 }
987
nfc_genl_send_params(struct sk_buff * msg,struct nfc_llcp_local * local,u32 portid,u32 seq)988 static int nfc_genl_send_params(struct sk_buff *msg,
989 struct nfc_llcp_local *local,
990 u32 portid, u32 seq)
991 {
992 void *hdr;
993
994 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
995 NFC_CMD_LLC_GET_PARAMS);
996 if (!hdr)
997 return -EMSGSIZE;
998
999 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1000 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1001 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1002 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1003 goto nla_put_failure;
1004
1005 genlmsg_end(msg, hdr);
1006 return 0;
1007
1008 nla_put_failure:
1009 genlmsg_cancel(msg, hdr);
1010 return -EMSGSIZE;
1011 }
1012
nfc_genl_llc_get_params(struct sk_buff * skb,struct genl_info * info)1013 static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1014 {
1015 struct nfc_dev *dev;
1016 struct nfc_llcp_local *local;
1017 int rc = 0;
1018 struct sk_buff *msg = NULL;
1019 u32 idx;
1020
1021 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1022 !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1023 return -EINVAL;
1024
1025 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1026
1027 dev = nfc_get_device(idx);
1028 if (!dev)
1029 return -ENODEV;
1030
1031 device_lock(&dev->dev);
1032
1033 local = nfc_llcp_find_local(dev);
1034 if (!local) {
1035 rc = -ENODEV;
1036 goto exit;
1037 }
1038
1039 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1040 if (!msg) {
1041 rc = -ENOMEM;
1042 goto put_local;
1043 }
1044
1045 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1046
1047 put_local:
1048 nfc_llcp_local_put(local);
1049
1050 exit:
1051 device_unlock(&dev->dev);
1052
1053 nfc_put_device(dev);
1054
1055 if (rc < 0) {
1056 if (msg)
1057 nlmsg_free(msg);
1058
1059 return rc;
1060 }
1061
1062 return genlmsg_reply(msg, info);
1063 }
1064
nfc_genl_llc_set_params(struct sk_buff * skb,struct genl_info * info)1065 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1066 {
1067 struct nfc_dev *dev;
1068 struct nfc_llcp_local *local;
1069 u8 rw = 0;
1070 u16 miux = 0;
1071 u32 idx;
1072 int rc = 0;
1073
1074 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1075 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1076 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1077 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1078 return -EINVAL;
1079
1080 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1081 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1082
1083 if (rw > LLCP_MAX_RW)
1084 return -EINVAL;
1085 }
1086
1087 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1088 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1089
1090 if (miux > LLCP_MAX_MIUX)
1091 return -EINVAL;
1092 }
1093
1094 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1095
1096 dev = nfc_get_device(idx);
1097 if (!dev)
1098 return -ENODEV;
1099
1100 device_lock(&dev->dev);
1101
1102 local = nfc_llcp_find_local(dev);
1103 if (!local) {
1104 rc = -ENODEV;
1105 goto exit;
1106 }
1107
1108 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1109 if (dev->dep_link_up) {
1110 rc = -EINPROGRESS;
1111 goto put_local;
1112 }
1113
1114 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1115 }
1116
1117 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1118 local->rw = rw;
1119
1120 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1121 local->miux = cpu_to_be16(miux);
1122
1123 put_local:
1124 nfc_llcp_local_put(local);
1125
1126 exit:
1127 device_unlock(&dev->dev);
1128
1129 nfc_put_device(dev);
1130
1131 return rc;
1132 }
1133
nfc_genl_llc_sdreq(struct sk_buff * skb,struct genl_info * info)1134 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1135 {
1136 struct nfc_dev *dev;
1137 struct nfc_llcp_local *local;
1138 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1139 u32 idx;
1140 u8 tid;
1141 char *uri;
1142 int rc = 0, rem;
1143 size_t uri_len, tlvs_len;
1144 struct hlist_head sdreq_list;
1145 struct nfc_llcp_sdp_tlv *sdreq;
1146
1147 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1148 !info->attrs[NFC_ATTR_LLC_SDP])
1149 return -EINVAL;
1150
1151 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1152
1153 dev = nfc_get_device(idx);
1154 if (!dev)
1155 return -ENODEV;
1156
1157 device_lock(&dev->dev);
1158
1159 if (dev->dep_link_up == false) {
1160 rc = -ENOLINK;
1161 goto exit;
1162 }
1163
1164 local = nfc_llcp_find_local(dev);
1165 if (!local) {
1166 rc = -ENODEV;
1167 goto exit;
1168 }
1169
1170 INIT_HLIST_HEAD(&sdreq_list);
1171
1172 tlvs_len = 0;
1173
1174 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1175 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1176 attr, nfc_sdp_genl_policy,
1177 info->extack);
1178
1179 if (rc != 0) {
1180 rc = -EINVAL;
1181 goto put_local;
1182 }
1183
1184 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1185 continue;
1186
1187 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1188 if (uri_len == 0)
1189 continue;
1190
1191 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1192 if (uri == NULL || *uri == 0)
1193 continue;
1194
1195 tid = local->sdreq_next_tid++;
1196
1197 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1198 if (sdreq == NULL) {
1199 rc = -ENOMEM;
1200 goto put_local;
1201 }
1202
1203 tlvs_len += sdreq->tlv_len;
1204
1205 hlist_add_head(&sdreq->node, &sdreq_list);
1206 }
1207
1208 if (hlist_empty(&sdreq_list)) {
1209 rc = -EINVAL;
1210 goto put_local;
1211 }
1212
1213 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1214
1215 put_local:
1216 nfc_llcp_local_put(local);
1217
1218 exit:
1219 device_unlock(&dev->dev);
1220
1221 nfc_put_device(dev);
1222
1223 return rc;
1224 }
1225
nfc_genl_fw_download(struct sk_buff * skb,struct genl_info * info)1226 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1227 {
1228 struct nfc_dev *dev;
1229 int rc;
1230 u32 idx;
1231 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1232
1233 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1234 return -EINVAL;
1235
1236 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1237
1238 dev = nfc_get_device(idx);
1239 if (!dev)
1240 return -ENODEV;
1241
1242 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1243 sizeof(firmware_name));
1244
1245 rc = nfc_fw_download(dev, firmware_name);
1246
1247 nfc_put_device(dev);
1248 return rc;
1249 }
1250
nfc_genl_fw_download_done(struct nfc_dev * dev,const char * firmware_name,u32 result)1251 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1252 u32 result)
1253 {
1254 struct sk_buff *msg;
1255 void *hdr;
1256
1257 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1258 if (!msg)
1259 return -ENOMEM;
1260
1261 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1262 NFC_CMD_FW_DOWNLOAD);
1263 if (!hdr)
1264 goto free_msg;
1265
1266 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1267 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1268 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1269 goto nla_put_failure;
1270
1271 genlmsg_end(msg, hdr);
1272
1273 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
1274
1275 return 0;
1276
1277 nla_put_failure:
1278 free_msg:
1279 nlmsg_free(msg);
1280 return -EMSGSIZE;
1281 }
1282
nfc_genl_enable_se(struct sk_buff * skb,struct genl_info * info)1283 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1284 {
1285 struct nfc_dev *dev;
1286 int rc;
1287 u32 idx, se_idx;
1288
1289 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1290 !info->attrs[NFC_ATTR_SE_INDEX])
1291 return -EINVAL;
1292
1293 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1294 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1295
1296 dev = nfc_get_device(idx);
1297 if (!dev)
1298 return -ENODEV;
1299
1300 rc = nfc_enable_se(dev, se_idx);
1301
1302 nfc_put_device(dev);
1303 return rc;
1304 }
1305
nfc_genl_disable_se(struct sk_buff * skb,struct genl_info * info)1306 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1307 {
1308 struct nfc_dev *dev;
1309 int rc;
1310 u32 idx, se_idx;
1311
1312 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1313 !info->attrs[NFC_ATTR_SE_INDEX])
1314 return -EINVAL;
1315
1316 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1317 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1318
1319 dev = nfc_get_device(idx);
1320 if (!dev)
1321 return -ENODEV;
1322
1323 rc = nfc_disable_se(dev, se_idx);
1324
1325 nfc_put_device(dev);
1326 return rc;
1327 }
1328
nfc_genl_send_se(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)1329 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1330 u32 portid, u32 seq,
1331 struct netlink_callback *cb,
1332 int flags)
1333 {
1334 void *hdr;
1335 struct nfc_se *se, *n;
1336
1337 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1338 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1339 NFC_CMD_GET_SE);
1340 if (!hdr)
1341 goto nla_put_failure;
1342
1343 if (cb)
1344 genl_dump_check_consistent(cb, hdr);
1345
1346 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1347 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1348 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1349 goto nla_put_failure;
1350
1351 genlmsg_end(msg, hdr);
1352 }
1353
1354 return 0;
1355
1356 nla_put_failure:
1357 genlmsg_cancel(msg, hdr);
1358 return -EMSGSIZE;
1359 }
1360
nfc_genl_dump_ses(struct sk_buff * skb,struct netlink_callback * cb)1361 static int nfc_genl_dump_ses(struct sk_buff *skb,
1362 struct netlink_callback *cb)
1363 {
1364 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1365 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1366 bool first_call = false;
1367
1368 if (!iter) {
1369 first_call = true;
1370 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1371 if (!iter)
1372 return -ENOMEM;
1373 cb->args[0] = (long) iter;
1374 }
1375
1376 mutex_lock(&nfc_devlist_mutex);
1377
1378 cb->seq = nfc_devlist_generation;
1379
1380 if (first_call) {
1381 nfc_device_iter_init(iter);
1382 dev = nfc_device_iter_next(iter);
1383 }
1384
1385 while (dev) {
1386 int rc;
1387
1388 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1389 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1390 if (rc < 0)
1391 break;
1392
1393 dev = nfc_device_iter_next(iter);
1394 }
1395
1396 mutex_unlock(&nfc_devlist_mutex);
1397
1398 cb->args[1] = (long) dev;
1399
1400 return skb->len;
1401 }
1402
nfc_genl_dump_ses_done(struct netlink_callback * cb)1403 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1404 {
1405 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1406
1407 if (iter) {
1408 nfc_device_iter_exit(iter);
1409 kfree(iter);
1410 }
1411
1412 return 0;
1413 }
1414
nfc_se_io(struct nfc_dev * dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1415 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1416 u8 *apdu, size_t apdu_length,
1417 se_io_cb_t cb, void *cb_context)
1418 {
1419 struct nfc_se *se;
1420 int rc;
1421
1422 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1423
1424 device_lock(&dev->dev);
1425
1426 if (!device_is_registered(&dev->dev)) {
1427 rc = -ENODEV;
1428 goto error;
1429 }
1430
1431 if (!dev->dev_up) {
1432 rc = -ENODEV;
1433 goto error;
1434 }
1435
1436 if (!dev->ops->se_io) {
1437 rc = -EOPNOTSUPP;
1438 goto error;
1439 }
1440
1441 se = nfc_find_se(dev, se_idx);
1442 if (!se) {
1443 rc = -EINVAL;
1444 goto error;
1445 }
1446
1447 if (se->state != NFC_SE_ENABLED) {
1448 rc = -ENODEV;
1449 goto error;
1450 }
1451
1452 rc = dev->ops->se_io(dev, se_idx, apdu,
1453 apdu_length, cb, cb_context);
1454
1455 device_unlock(&dev->dev);
1456 return rc;
1457
1458 error:
1459 device_unlock(&dev->dev);
1460 kfree(cb_context);
1461 return rc;
1462 }
1463
1464 struct se_io_ctx {
1465 u32 dev_idx;
1466 u32 se_idx;
1467 };
1468
se_io_cb(void * context,u8 * apdu,size_t apdu_len,int err)1469 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1470 {
1471 struct se_io_ctx *ctx = context;
1472 struct sk_buff *msg;
1473 void *hdr;
1474
1475 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1476 if (!msg) {
1477 kfree(ctx);
1478 return;
1479 }
1480
1481 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1482 NFC_CMD_SE_IO);
1483 if (!hdr)
1484 goto free_msg;
1485
1486 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1487 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1488 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1489 goto nla_put_failure;
1490
1491 genlmsg_end(msg, hdr);
1492
1493 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1494
1495 kfree(ctx);
1496
1497 return;
1498
1499 nla_put_failure:
1500 free_msg:
1501 nlmsg_free(msg);
1502 kfree(ctx);
1503
1504 return;
1505 }
1506
nfc_genl_se_io(struct sk_buff * skb,struct genl_info * info)1507 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1508 {
1509 struct nfc_dev *dev;
1510 struct se_io_ctx *ctx;
1511 u32 dev_idx, se_idx;
1512 u8 *apdu;
1513 size_t apdu_len;
1514 int rc;
1515
1516 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1517 !info->attrs[NFC_ATTR_SE_INDEX] ||
1518 !info->attrs[NFC_ATTR_SE_APDU])
1519 return -EINVAL;
1520
1521 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1522 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1523
1524 dev = nfc_get_device(dev_idx);
1525 if (!dev)
1526 return -ENODEV;
1527
1528 if (!dev->ops || !dev->ops->se_io) {
1529 rc = -EOPNOTSUPP;
1530 goto put_dev;
1531 }
1532
1533 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1534 if (apdu_len == 0) {
1535 rc = -EINVAL;
1536 goto put_dev;
1537 }
1538
1539 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1540 if (!apdu) {
1541 rc = -EINVAL;
1542 goto put_dev;
1543 }
1544
1545 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1546 if (!ctx) {
1547 rc = -ENOMEM;
1548 goto put_dev;
1549 }
1550
1551 ctx->dev_idx = dev_idx;
1552 ctx->se_idx = se_idx;
1553
1554 rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1555
1556 put_dev:
1557 nfc_put_device(dev);
1558 return rc;
1559 }
1560
nfc_genl_vendor_cmd(struct sk_buff * skb,struct genl_info * info)1561 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1562 struct genl_info *info)
1563 {
1564 struct nfc_dev *dev;
1565 const struct nfc_vendor_cmd *cmd;
1566 u32 dev_idx, vid, subcmd;
1567 u8 *data;
1568 size_t data_len;
1569 int i, err;
1570
1571 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1572 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1573 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1574 return -EINVAL;
1575
1576 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1577 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1578 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1579
1580 dev = nfc_get_device(dev_idx);
1581 if (!dev)
1582 return -ENODEV;
1583
1584 if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
1585 err = -ENODEV;
1586 goto put_dev;
1587 }
1588
1589 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1590 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1591 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1592 if (data_len == 0) {
1593 err = -EINVAL;
1594 goto put_dev;
1595 }
1596 } else {
1597 data = NULL;
1598 data_len = 0;
1599 }
1600
1601 for (i = 0; i < dev->n_vendor_cmds; i++) {
1602 cmd = &dev->vendor_cmds[i];
1603
1604 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1605 continue;
1606
1607 dev->cur_cmd_info = info;
1608 err = cmd->doit(dev, data, data_len);
1609 dev->cur_cmd_info = NULL;
1610 goto put_dev;
1611 }
1612
1613 err = -EOPNOTSUPP;
1614
1615 put_dev:
1616 nfc_put_device(dev);
1617 return err;
1618 }
1619
1620 /* message building helper */
nfc_hdr_put(struct sk_buff * skb,u32 portid,u32 seq,int flags,u8 cmd)1621 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1622 int flags, u8 cmd)
1623 {
1624 /* since there is no private header just add the generic one */
1625 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1626 }
1627
1628 static struct sk_buff *
__nfc_alloc_vendor_cmd_skb(struct nfc_dev * dev,int approxlen,u32 portid,u32 seq,enum nfc_attrs attr,u32 oui,u32 subcmd,gfp_t gfp)1629 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1630 u32 portid, u32 seq,
1631 enum nfc_attrs attr,
1632 u32 oui, u32 subcmd, gfp_t gfp)
1633 {
1634 struct sk_buff *skb;
1635 void *hdr;
1636
1637 skb = nlmsg_new(approxlen + 100, gfp);
1638 if (!skb)
1639 return NULL;
1640
1641 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1642 if (!hdr) {
1643 kfree_skb(skb);
1644 return NULL;
1645 }
1646
1647 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1648 goto nla_put_failure;
1649 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1650 goto nla_put_failure;
1651 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1652 goto nla_put_failure;
1653
1654 ((void **)skb->cb)[0] = dev;
1655 ((void **)skb->cb)[1] = hdr;
1656
1657 return skb;
1658
1659 nla_put_failure:
1660 kfree_skb(skb);
1661 return NULL;
1662 }
1663
__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev * dev,enum nfc_attrs attr,u32 oui,u32 subcmd,int approxlen)1664 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1665 enum nfc_attrs attr,
1666 u32 oui, u32 subcmd,
1667 int approxlen)
1668 {
1669 if (WARN_ON(!dev->cur_cmd_info))
1670 return NULL;
1671
1672 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1673 dev->cur_cmd_info->snd_portid,
1674 dev->cur_cmd_info->snd_seq, attr,
1675 oui, subcmd, GFP_KERNEL);
1676 }
1677 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1678
nfc_vendor_cmd_reply(struct sk_buff * skb)1679 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1680 {
1681 struct nfc_dev *dev = ((void **)skb->cb)[0];
1682 void *hdr = ((void **)skb->cb)[1];
1683
1684 /* clear CB data for netlink core to own from now on */
1685 memset(skb->cb, 0, sizeof(skb->cb));
1686
1687 if (WARN_ON(!dev->cur_cmd_info)) {
1688 kfree_skb(skb);
1689 return -EINVAL;
1690 }
1691
1692 genlmsg_end(skb, hdr);
1693 return genlmsg_reply(skb, dev->cur_cmd_info);
1694 }
1695 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1696
1697 static const struct genl_ops nfc_genl_ops[] = {
1698 {
1699 .cmd = NFC_CMD_GET_DEVICE,
1700 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1701 .doit = nfc_genl_get_device,
1702 .dumpit = nfc_genl_dump_devices,
1703 .done = nfc_genl_dump_devices_done,
1704 },
1705 {
1706 .cmd = NFC_CMD_DEV_UP,
1707 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1708 .doit = nfc_genl_dev_up,
1709 .flags = GENL_ADMIN_PERM,
1710 },
1711 {
1712 .cmd = NFC_CMD_DEV_DOWN,
1713 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1714 .doit = nfc_genl_dev_down,
1715 .flags = GENL_ADMIN_PERM,
1716 },
1717 {
1718 .cmd = NFC_CMD_START_POLL,
1719 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1720 .doit = nfc_genl_start_poll,
1721 .flags = GENL_ADMIN_PERM,
1722 },
1723 {
1724 .cmd = NFC_CMD_STOP_POLL,
1725 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1726 .doit = nfc_genl_stop_poll,
1727 .flags = GENL_ADMIN_PERM,
1728 },
1729 {
1730 .cmd = NFC_CMD_DEP_LINK_UP,
1731 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1732 .doit = nfc_genl_dep_link_up,
1733 .flags = GENL_ADMIN_PERM,
1734 },
1735 {
1736 .cmd = NFC_CMD_DEP_LINK_DOWN,
1737 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1738 .doit = nfc_genl_dep_link_down,
1739 .flags = GENL_ADMIN_PERM,
1740 },
1741 {
1742 .cmd = NFC_CMD_GET_TARGET,
1743 .validate = GENL_DONT_VALIDATE_STRICT |
1744 GENL_DONT_VALIDATE_DUMP_STRICT,
1745 .dumpit = nfc_genl_dump_targets,
1746 .done = nfc_genl_dump_targets_done,
1747 },
1748 {
1749 .cmd = NFC_CMD_LLC_GET_PARAMS,
1750 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1751 .doit = nfc_genl_llc_get_params,
1752 },
1753 {
1754 .cmd = NFC_CMD_LLC_SET_PARAMS,
1755 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1756 .doit = nfc_genl_llc_set_params,
1757 .flags = GENL_ADMIN_PERM,
1758 },
1759 {
1760 .cmd = NFC_CMD_LLC_SDREQ,
1761 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1762 .doit = nfc_genl_llc_sdreq,
1763 .flags = GENL_ADMIN_PERM,
1764 },
1765 {
1766 .cmd = NFC_CMD_FW_DOWNLOAD,
1767 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1768 .doit = nfc_genl_fw_download,
1769 .flags = GENL_ADMIN_PERM,
1770 },
1771 {
1772 .cmd = NFC_CMD_ENABLE_SE,
1773 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1774 .doit = nfc_genl_enable_se,
1775 .flags = GENL_ADMIN_PERM,
1776 },
1777 {
1778 .cmd = NFC_CMD_DISABLE_SE,
1779 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1780 .doit = nfc_genl_disable_se,
1781 .flags = GENL_ADMIN_PERM,
1782 },
1783 {
1784 .cmd = NFC_CMD_GET_SE,
1785 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1786 .dumpit = nfc_genl_dump_ses,
1787 .done = nfc_genl_dump_ses_done,
1788 },
1789 {
1790 .cmd = NFC_CMD_SE_IO,
1791 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1792 .doit = nfc_genl_se_io,
1793 .flags = GENL_ADMIN_PERM,
1794 },
1795 {
1796 .cmd = NFC_CMD_ACTIVATE_TARGET,
1797 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1798 .doit = nfc_genl_activate_target,
1799 .flags = GENL_ADMIN_PERM,
1800 },
1801 {
1802 .cmd = NFC_CMD_VENDOR,
1803 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1804 .doit = nfc_genl_vendor_cmd,
1805 .flags = GENL_ADMIN_PERM,
1806 },
1807 {
1808 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1809 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1810 .doit = nfc_genl_deactivate_target,
1811 .flags = GENL_ADMIN_PERM,
1812 },
1813 };
1814
1815 static struct genl_family nfc_genl_family __ro_after_init = {
1816 .hdrsize = 0,
1817 .name = NFC_GENL_NAME,
1818 .version = NFC_GENL_VERSION,
1819 .maxattr = NFC_ATTR_MAX,
1820 .policy = nfc_genl_policy,
1821 .module = THIS_MODULE,
1822 .ops = nfc_genl_ops,
1823 .n_ops = ARRAY_SIZE(nfc_genl_ops),
1824 .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
1825 .mcgrps = nfc_genl_mcgrps,
1826 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1827 };
1828
1829
1830 struct urelease_work {
1831 struct work_struct w;
1832 u32 portid;
1833 };
1834
nfc_urelease_event_work(struct work_struct * work)1835 static void nfc_urelease_event_work(struct work_struct *work)
1836 {
1837 struct urelease_work *w = container_of(work, struct urelease_work, w);
1838 struct class_dev_iter iter;
1839 struct nfc_dev *dev;
1840
1841 pr_debug("portid %d\n", w->portid);
1842
1843 mutex_lock(&nfc_devlist_mutex);
1844
1845 nfc_device_iter_init(&iter);
1846 dev = nfc_device_iter_next(&iter);
1847
1848 while (dev) {
1849 mutex_lock(&dev->genl_data.genl_data_mutex);
1850
1851 if (dev->genl_data.poll_req_portid == w->portid) {
1852 nfc_stop_poll(dev);
1853 dev->genl_data.poll_req_portid = 0;
1854 }
1855
1856 mutex_unlock(&dev->genl_data.genl_data_mutex);
1857
1858 dev = nfc_device_iter_next(&iter);
1859 }
1860
1861 nfc_device_iter_exit(&iter);
1862
1863 mutex_unlock(&nfc_devlist_mutex);
1864
1865 kfree(w);
1866 }
1867
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)1868 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1869 unsigned long event, void *ptr)
1870 {
1871 struct netlink_notify *n = ptr;
1872 struct urelease_work *w;
1873
1874 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1875 goto out;
1876
1877 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1878
1879 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1880 if (w) {
1881 INIT_WORK(&w->w, nfc_urelease_event_work);
1882 w->portid = n->portid;
1883 schedule_work(&w->w);
1884 }
1885
1886 out:
1887 return NOTIFY_DONE;
1888 }
1889
nfc_genl_data_init(struct nfc_genl_data * genl_data)1890 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1891 {
1892 genl_data->poll_req_portid = 0;
1893 mutex_init(&genl_data->genl_data_mutex);
1894 }
1895
nfc_genl_data_exit(struct nfc_genl_data * genl_data)1896 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1897 {
1898 mutex_destroy(&genl_data->genl_data_mutex);
1899 }
1900
1901 static struct notifier_block nl_notifier = {
1902 .notifier_call = nfc_genl_rcv_nl_event,
1903 };
1904
1905 /**
1906 * nfc_genl_init() - Initialize netlink interface
1907 *
1908 * This initialization function registers the nfc netlink family.
1909 */
nfc_genl_init(void)1910 int __init nfc_genl_init(void)
1911 {
1912 int rc;
1913
1914 rc = genl_register_family(&nfc_genl_family);
1915 if (rc)
1916 return rc;
1917
1918 netlink_register_notifier(&nl_notifier);
1919
1920 return 0;
1921 }
1922
1923 /**
1924 * nfc_genl_exit() - Deinitialize netlink interface
1925 *
1926 * This exit function unregisters the nfc netlink family.
1927 */
nfc_genl_exit(void)1928 void nfc_genl_exit(void)
1929 {
1930 netlink_unregister_notifier(&nl_notifier);
1931 genl_unregister_family(&nfc_genl_family);
1932 }
1933