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->attrs[NFC_ATTR_DEVICE_INDEX])
114 return ERR_PTR(-EINVAL);
115
116 idx = nla_get_u32(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 exit;
1043 }
1044
1045 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1046
1047 exit:
1048 device_unlock(&dev->dev);
1049
1050 nfc_put_device(dev);
1051
1052 if (rc < 0) {
1053 if (msg)
1054 nlmsg_free(msg);
1055
1056 return rc;
1057 }
1058
1059 return genlmsg_reply(msg, info);
1060 }
1061
nfc_genl_llc_set_params(struct sk_buff * skb,struct genl_info * info)1062 static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1063 {
1064 struct nfc_dev *dev;
1065 struct nfc_llcp_local *local;
1066 u8 rw = 0;
1067 u16 miux = 0;
1068 u32 idx;
1069 int rc = 0;
1070
1071 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1072 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1073 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1074 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1075 return -EINVAL;
1076
1077 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1078 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1079
1080 if (rw > LLCP_MAX_RW)
1081 return -EINVAL;
1082 }
1083
1084 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1085 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1086
1087 if (miux > LLCP_MAX_MIUX)
1088 return -EINVAL;
1089 }
1090
1091 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1092
1093 dev = nfc_get_device(idx);
1094 if (!dev)
1095 return -ENODEV;
1096
1097 device_lock(&dev->dev);
1098
1099 local = nfc_llcp_find_local(dev);
1100 if (!local) {
1101 rc = -ENODEV;
1102 goto exit;
1103 }
1104
1105 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1106 if (dev->dep_link_up) {
1107 rc = -EINPROGRESS;
1108 goto exit;
1109 }
1110
1111 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1112 }
1113
1114 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1115 local->rw = rw;
1116
1117 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1118 local->miux = cpu_to_be16(miux);
1119
1120 exit:
1121 device_unlock(&dev->dev);
1122
1123 nfc_put_device(dev);
1124
1125 return rc;
1126 }
1127
nfc_genl_llc_sdreq(struct sk_buff * skb,struct genl_info * info)1128 static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1129 {
1130 struct nfc_dev *dev;
1131 struct nfc_llcp_local *local;
1132 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1133 u32 idx;
1134 u8 tid;
1135 char *uri;
1136 int rc = 0, rem;
1137 size_t uri_len, tlvs_len;
1138 struct hlist_head sdreq_list;
1139 struct nfc_llcp_sdp_tlv *sdreq;
1140
1141 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1142 !info->attrs[NFC_ATTR_LLC_SDP])
1143 return -EINVAL;
1144
1145 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1146
1147 dev = nfc_get_device(idx);
1148 if (!dev)
1149 return -ENODEV;
1150
1151 device_lock(&dev->dev);
1152
1153 if (dev->dep_link_up == false) {
1154 rc = -ENOLINK;
1155 goto exit;
1156 }
1157
1158 local = nfc_llcp_find_local(dev);
1159 if (!local) {
1160 rc = -ENODEV;
1161 goto exit;
1162 }
1163
1164 INIT_HLIST_HEAD(&sdreq_list);
1165
1166 tlvs_len = 0;
1167
1168 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1169 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1170 attr, nfc_sdp_genl_policy,
1171 info->extack);
1172
1173 if (rc != 0) {
1174 rc = -EINVAL;
1175 goto exit;
1176 }
1177
1178 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1179 continue;
1180
1181 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1182 if (uri_len == 0)
1183 continue;
1184
1185 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1186 if (uri == NULL || *uri == 0)
1187 continue;
1188
1189 tid = local->sdreq_next_tid++;
1190
1191 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1192 if (sdreq == NULL) {
1193 rc = -ENOMEM;
1194 goto exit;
1195 }
1196
1197 tlvs_len += sdreq->tlv_len;
1198
1199 hlist_add_head(&sdreq->node, &sdreq_list);
1200 }
1201
1202 if (hlist_empty(&sdreq_list)) {
1203 rc = -EINVAL;
1204 goto exit;
1205 }
1206
1207 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1208 exit:
1209 device_unlock(&dev->dev);
1210
1211 nfc_put_device(dev);
1212
1213 return rc;
1214 }
1215
nfc_genl_fw_download(struct sk_buff * skb,struct genl_info * info)1216 static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1217 {
1218 struct nfc_dev *dev;
1219 int rc;
1220 u32 idx;
1221 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1222
1223 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1224 return -EINVAL;
1225
1226 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1227
1228 dev = nfc_get_device(idx);
1229 if (!dev)
1230 return -ENODEV;
1231
1232 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1233 sizeof(firmware_name));
1234
1235 rc = nfc_fw_download(dev, firmware_name);
1236
1237 nfc_put_device(dev);
1238 return rc;
1239 }
1240
nfc_genl_fw_download_done(struct nfc_dev * dev,const char * firmware_name,u32 result)1241 int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1242 u32 result)
1243 {
1244 struct sk_buff *msg;
1245 void *hdr;
1246
1247 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1248 if (!msg)
1249 return -ENOMEM;
1250
1251 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1252 NFC_CMD_FW_DOWNLOAD);
1253 if (!hdr)
1254 goto free_msg;
1255
1256 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1257 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1258 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1259 goto nla_put_failure;
1260
1261 genlmsg_end(msg, hdr);
1262
1263 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
1264
1265 return 0;
1266
1267 nla_put_failure:
1268 free_msg:
1269 nlmsg_free(msg);
1270 return -EMSGSIZE;
1271 }
1272
nfc_genl_enable_se(struct sk_buff * skb,struct genl_info * info)1273 static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1274 {
1275 struct nfc_dev *dev;
1276 int rc;
1277 u32 idx, se_idx;
1278
1279 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1280 !info->attrs[NFC_ATTR_SE_INDEX])
1281 return -EINVAL;
1282
1283 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1284 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1285
1286 dev = nfc_get_device(idx);
1287 if (!dev)
1288 return -ENODEV;
1289
1290 rc = nfc_enable_se(dev, se_idx);
1291
1292 nfc_put_device(dev);
1293 return rc;
1294 }
1295
nfc_genl_disable_se(struct sk_buff * skb,struct genl_info * info)1296 static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1297 {
1298 struct nfc_dev *dev;
1299 int rc;
1300 u32 idx, se_idx;
1301
1302 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1303 !info->attrs[NFC_ATTR_SE_INDEX])
1304 return -EINVAL;
1305
1306 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1307 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1308
1309 dev = nfc_get_device(idx);
1310 if (!dev)
1311 return -ENODEV;
1312
1313 rc = nfc_disable_se(dev, se_idx);
1314
1315 nfc_put_device(dev);
1316 return rc;
1317 }
1318
nfc_genl_send_se(struct sk_buff * msg,struct nfc_dev * dev,u32 portid,u32 seq,struct netlink_callback * cb,int flags)1319 static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1320 u32 portid, u32 seq,
1321 struct netlink_callback *cb,
1322 int flags)
1323 {
1324 void *hdr;
1325 struct nfc_se *se, *n;
1326
1327 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1328 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1329 NFC_CMD_GET_SE);
1330 if (!hdr)
1331 goto nla_put_failure;
1332
1333 if (cb)
1334 genl_dump_check_consistent(cb, hdr);
1335
1336 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1337 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1338 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1339 goto nla_put_failure;
1340
1341 genlmsg_end(msg, hdr);
1342 }
1343
1344 return 0;
1345
1346 nla_put_failure:
1347 genlmsg_cancel(msg, hdr);
1348 return -EMSGSIZE;
1349 }
1350
nfc_genl_dump_ses(struct sk_buff * skb,struct netlink_callback * cb)1351 static int nfc_genl_dump_ses(struct sk_buff *skb,
1352 struct netlink_callback *cb)
1353 {
1354 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1355 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1356 bool first_call = false;
1357
1358 if (!iter) {
1359 first_call = true;
1360 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1361 if (!iter)
1362 return -ENOMEM;
1363 cb->args[0] = (long) iter;
1364 }
1365
1366 mutex_lock(&nfc_devlist_mutex);
1367
1368 cb->seq = nfc_devlist_generation;
1369
1370 if (first_call) {
1371 nfc_device_iter_init(iter);
1372 dev = nfc_device_iter_next(iter);
1373 }
1374
1375 while (dev) {
1376 int rc;
1377
1378 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1379 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1380 if (rc < 0)
1381 break;
1382
1383 dev = nfc_device_iter_next(iter);
1384 }
1385
1386 mutex_unlock(&nfc_devlist_mutex);
1387
1388 cb->args[1] = (long) dev;
1389
1390 return skb->len;
1391 }
1392
nfc_genl_dump_ses_done(struct netlink_callback * cb)1393 static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1394 {
1395 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1396
1397 if (iter) {
1398 nfc_device_iter_exit(iter);
1399 kfree(iter);
1400 }
1401
1402 return 0;
1403 }
1404
nfc_se_io(struct nfc_dev * dev,u32 se_idx,u8 * apdu,size_t apdu_length,se_io_cb_t cb,void * cb_context)1405 static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1406 u8 *apdu, size_t apdu_length,
1407 se_io_cb_t cb, void *cb_context)
1408 {
1409 struct nfc_se *se;
1410 int rc;
1411
1412 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1413
1414 device_lock(&dev->dev);
1415
1416 if (!device_is_registered(&dev->dev)) {
1417 rc = -ENODEV;
1418 goto error;
1419 }
1420
1421 if (!dev->dev_up) {
1422 rc = -ENODEV;
1423 goto error;
1424 }
1425
1426 if (!dev->ops->se_io) {
1427 rc = -EOPNOTSUPP;
1428 goto error;
1429 }
1430
1431 se = nfc_find_se(dev, se_idx);
1432 if (!se) {
1433 rc = -EINVAL;
1434 goto error;
1435 }
1436
1437 if (se->state != NFC_SE_ENABLED) {
1438 rc = -ENODEV;
1439 goto error;
1440 }
1441
1442 rc = dev->ops->se_io(dev, se_idx, apdu,
1443 apdu_length, cb, cb_context);
1444
1445 error:
1446 device_unlock(&dev->dev);
1447 return rc;
1448 }
1449
1450 struct se_io_ctx {
1451 u32 dev_idx;
1452 u32 se_idx;
1453 };
1454
se_io_cb(void * context,u8 * apdu,size_t apdu_len,int err)1455 static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1456 {
1457 struct se_io_ctx *ctx = context;
1458 struct sk_buff *msg;
1459 void *hdr;
1460
1461 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1462 if (!msg) {
1463 kfree(ctx);
1464 return;
1465 }
1466
1467 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1468 NFC_CMD_SE_IO);
1469 if (!hdr)
1470 goto free_msg;
1471
1472 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1473 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1474 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1475 goto nla_put_failure;
1476
1477 genlmsg_end(msg, hdr);
1478
1479 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1480
1481 kfree(ctx);
1482
1483 return;
1484
1485 nla_put_failure:
1486 free_msg:
1487 nlmsg_free(msg);
1488 kfree(ctx);
1489
1490 return;
1491 }
1492
nfc_genl_se_io(struct sk_buff * skb,struct genl_info * info)1493 static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1494 {
1495 struct nfc_dev *dev;
1496 struct se_io_ctx *ctx;
1497 u32 dev_idx, se_idx;
1498 u8 *apdu;
1499 size_t apdu_len;
1500 int rc;
1501
1502 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1503 !info->attrs[NFC_ATTR_SE_INDEX] ||
1504 !info->attrs[NFC_ATTR_SE_APDU])
1505 return -EINVAL;
1506
1507 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1508 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1509
1510 dev = nfc_get_device(dev_idx);
1511 if (!dev)
1512 return -ENODEV;
1513
1514 if (!dev->ops || !dev->ops->se_io) {
1515 rc = -EOPNOTSUPP;
1516 goto put_dev;
1517 }
1518
1519 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1520 if (apdu_len == 0) {
1521 rc = -EINVAL;
1522 goto put_dev;
1523 }
1524
1525 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1526 if (!apdu) {
1527 rc = -EINVAL;
1528 goto put_dev;
1529 }
1530
1531 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1532 if (!ctx) {
1533 rc = -ENOMEM;
1534 goto put_dev;
1535 }
1536
1537 ctx->dev_idx = dev_idx;
1538 ctx->se_idx = se_idx;
1539
1540 rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1541
1542 put_dev:
1543 nfc_put_device(dev);
1544 return rc;
1545 }
1546
nfc_genl_vendor_cmd(struct sk_buff * skb,struct genl_info * info)1547 static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1548 struct genl_info *info)
1549 {
1550 struct nfc_dev *dev;
1551 const struct nfc_vendor_cmd *cmd;
1552 u32 dev_idx, vid, subcmd;
1553 u8 *data;
1554 size_t data_len;
1555 int i, err;
1556
1557 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1558 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1559 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1560 return -EINVAL;
1561
1562 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1563 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1564 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1565
1566 dev = nfc_get_device(dev_idx);
1567 if (!dev)
1568 return -ENODEV;
1569
1570 if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
1571 err = -ENODEV;
1572 goto put_dev;
1573 }
1574
1575 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1576 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1577 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1578 if (data_len == 0) {
1579 err = -EINVAL;
1580 goto put_dev;
1581 }
1582 } else {
1583 data = NULL;
1584 data_len = 0;
1585 }
1586
1587 for (i = 0; i < dev->n_vendor_cmds; i++) {
1588 cmd = &dev->vendor_cmds[i];
1589
1590 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1591 continue;
1592
1593 dev->cur_cmd_info = info;
1594 err = cmd->doit(dev, data, data_len);
1595 dev->cur_cmd_info = NULL;
1596 goto put_dev;
1597 }
1598
1599 err = -EOPNOTSUPP;
1600
1601 put_dev:
1602 nfc_put_device(dev);
1603 return err;
1604 }
1605
1606 /* message building helper */
nfc_hdr_put(struct sk_buff * skb,u32 portid,u32 seq,int flags,u8 cmd)1607 static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1608 int flags, u8 cmd)
1609 {
1610 /* since there is no private header just add the generic one */
1611 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1612 }
1613
1614 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)1615 __nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1616 u32 portid, u32 seq,
1617 enum nfc_attrs attr,
1618 u32 oui, u32 subcmd, gfp_t gfp)
1619 {
1620 struct sk_buff *skb;
1621 void *hdr;
1622
1623 skb = nlmsg_new(approxlen + 100, gfp);
1624 if (!skb)
1625 return NULL;
1626
1627 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1628 if (!hdr) {
1629 kfree_skb(skb);
1630 return NULL;
1631 }
1632
1633 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1634 goto nla_put_failure;
1635 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1636 goto nla_put_failure;
1637 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1638 goto nla_put_failure;
1639
1640 ((void **)skb->cb)[0] = dev;
1641 ((void **)skb->cb)[1] = hdr;
1642
1643 return skb;
1644
1645 nla_put_failure:
1646 kfree_skb(skb);
1647 return NULL;
1648 }
1649
__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev * dev,enum nfc_attrs attr,u32 oui,u32 subcmd,int approxlen)1650 struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1651 enum nfc_attrs attr,
1652 u32 oui, u32 subcmd,
1653 int approxlen)
1654 {
1655 if (WARN_ON(!dev->cur_cmd_info))
1656 return NULL;
1657
1658 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1659 dev->cur_cmd_info->snd_portid,
1660 dev->cur_cmd_info->snd_seq, attr,
1661 oui, subcmd, GFP_KERNEL);
1662 }
1663 EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1664
nfc_vendor_cmd_reply(struct sk_buff * skb)1665 int nfc_vendor_cmd_reply(struct sk_buff *skb)
1666 {
1667 struct nfc_dev *dev = ((void **)skb->cb)[0];
1668 void *hdr = ((void **)skb->cb)[1];
1669
1670 /* clear CB data for netlink core to own from now on */
1671 memset(skb->cb, 0, sizeof(skb->cb));
1672
1673 if (WARN_ON(!dev->cur_cmd_info)) {
1674 kfree_skb(skb);
1675 return -EINVAL;
1676 }
1677
1678 genlmsg_end(skb, hdr);
1679 return genlmsg_reply(skb, dev->cur_cmd_info);
1680 }
1681 EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1682
1683 static const struct genl_ops nfc_genl_ops[] = {
1684 {
1685 .cmd = NFC_CMD_GET_DEVICE,
1686 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1687 .doit = nfc_genl_get_device,
1688 .dumpit = nfc_genl_dump_devices,
1689 .done = nfc_genl_dump_devices_done,
1690 },
1691 {
1692 .cmd = NFC_CMD_DEV_UP,
1693 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1694 .doit = nfc_genl_dev_up,
1695 .flags = GENL_ADMIN_PERM,
1696 },
1697 {
1698 .cmd = NFC_CMD_DEV_DOWN,
1699 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1700 .doit = nfc_genl_dev_down,
1701 .flags = GENL_ADMIN_PERM,
1702 },
1703 {
1704 .cmd = NFC_CMD_START_POLL,
1705 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1706 .doit = nfc_genl_start_poll,
1707 .flags = GENL_ADMIN_PERM,
1708 },
1709 {
1710 .cmd = NFC_CMD_STOP_POLL,
1711 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1712 .doit = nfc_genl_stop_poll,
1713 .flags = GENL_ADMIN_PERM,
1714 },
1715 {
1716 .cmd = NFC_CMD_DEP_LINK_UP,
1717 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1718 .doit = nfc_genl_dep_link_up,
1719 .flags = GENL_ADMIN_PERM,
1720 },
1721 {
1722 .cmd = NFC_CMD_DEP_LINK_DOWN,
1723 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1724 .doit = nfc_genl_dep_link_down,
1725 .flags = GENL_ADMIN_PERM,
1726 },
1727 {
1728 .cmd = NFC_CMD_GET_TARGET,
1729 .validate = GENL_DONT_VALIDATE_STRICT |
1730 GENL_DONT_VALIDATE_DUMP_STRICT,
1731 .dumpit = nfc_genl_dump_targets,
1732 .done = nfc_genl_dump_targets_done,
1733 },
1734 {
1735 .cmd = NFC_CMD_LLC_GET_PARAMS,
1736 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1737 .doit = nfc_genl_llc_get_params,
1738 },
1739 {
1740 .cmd = NFC_CMD_LLC_SET_PARAMS,
1741 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1742 .doit = nfc_genl_llc_set_params,
1743 .flags = GENL_ADMIN_PERM,
1744 },
1745 {
1746 .cmd = NFC_CMD_LLC_SDREQ,
1747 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1748 .doit = nfc_genl_llc_sdreq,
1749 .flags = GENL_ADMIN_PERM,
1750 },
1751 {
1752 .cmd = NFC_CMD_FW_DOWNLOAD,
1753 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1754 .doit = nfc_genl_fw_download,
1755 .flags = GENL_ADMIN_PERM,
1756 },
1757 {
1758 .cmd = NFC_CMD_ENABLE_SE,
1759 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1760 .doit = nfc_genl_enable_se,
1761 .flags = GENL_ADMIN_PERM,
1762 },
1763 {
1764 .cmd = NFC_CMD_DISABLE_SE,
1765 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1766 .doit = nfc_genl_disable_se,
1767 .flags = GENL_ADMIN_PERM,
1768 },
1769 {
1770 .cmd = NFC_CMD_GET_SE,
1771 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1772 .dumpit = nfc_genl_dump_ses,
1773 .done = nfc_genl_dump_ses_done,
1774 },
1775 {
1776 .cmd = NFC_CMD_SE_IO,
1777 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1778 .doit = nfc_genl_se_io,
1779 .flags = GENL_ADMIN_PERM,
1780 },
1781 {
1782 .cmd = NFC_CMD_ACTIVATE_TARGET,
1783 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1784 .doit = nfc_genl_activate_target,
1785 .flags = GENL_ADMIN_PERM,
1786 },
1787 {
1788 .cmd = NFC_CMD_VENDOR,
1789 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1790 .doit = nfc_genl_vendor_cmd,
1791 .flags = GENL_ADMIN_PERM,
1792 },
1793 {
1794 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1795 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1796 .doit = nfc_genl_deactivate_target,
1797 .flags = GENL_ADMIN_PERM,
1798 },
1799 };
1800
1801 static struct genl_family nfc_genl_family __ro_after_init = {
1802 .hdrsize = 0,
1803 .name = NFC_GENL_NAME,
1804 .version = NFC_GENL_VERSION,
1805 .maxattr = NFC_ATTR_MAX,
1806 .policy = nfc_genl_policy,
1807 .module = THIS_MODULE,
1808 .ops = nfc_genl_ops,
1809 .n_ops = ARRAY_SIZE(nfc_genl_ops),
1810 .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
1811 .mcgrps = nfc_genl_mcgrps,
1812 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1813 };
1814
1815
1816 struct urelease_work {
1817 struct work_struct w;
1818 u32 portid;
1819 };
1820
nfc_urelease_event_work(struct work_struct * work)1821 static void nfc_urelease_event_work(struct work_struct *work)
1822 {
1823 struct urelease_work *w = container_of(work, struct urelease_work, w);
1824 struct class_dev_iter iter;
1825 struct nfc_dev *dev;
1826
1827 pr_debug("portid %d\n", w->portid);
1828
1829 mutex_lock(&nfc_devlist_mutex);
1830
1831 nfc_device_iter_init(&iter);
1832 dev = nfc_device_iter_next(&iter);
1833
1834 while (dev) {
1835 mutex_lock(&dev->genl_data.genl_data_mutex);
1836
1837 if (dev->genl_data.poll_req_portid == w->portid) {
1838 nfc_stop_poll(dev);
1839 dev->genl_data.poll_req_portid = 0;
1840 }
1841
1842 mutex_unlock(&dev->genl_data.genl_data_mutex);
1843
1844 dev = nfc_device_iter_next(&iter);
1845 }
1846
1847 nfc_device_iter_exit(&iter);
1848
1849 mutex_unlock(&nfc_devlist_mutex);
1850
1851 kfree(w);
1852 }
1853
nfc_genl_rcv_nl_event(struct notifier_block * this,unsigned long event,void * ptr)1854 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1855 unsigned long event, void *ptr)
1856 {
1857 struct netlink_notify *n = ptr;
1858 struct urelease_work *w;
1859
1860 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1861 goto out;
1862
1863 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1864
1865 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1866 if (w) {
1867 INIT_WORK(&w->w, nfc_urelease_event_work);
1868 w->portid = n->portid;
1869 schedule_work(&w->w);
1870 }
1871
1872 out:
1873 return NOTIFY_DONE;
1874 }
1875
nfc_genl_data_init(struct nfc_genl_data * genl_data)1876 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1877 {
1878 genl_data->poll_req_portid = 0;
1879 mutex_init(&genl_data->genl_data_mutex);
1880 }
1881
nfc_genl_data_exit(struct nfc_genl_data * genl_data)1882 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1883 {
1884 mutex_destroy(&genl_data->genl_data_mutex);
1885 }
1886
1887 static struct notifier_block nl_notifier = {
1888 .notifier_call = nfc_genl_rcv_nl_event,
1889 };
1890
1891 /**
1892 * nfc_genl_init() - Initialize netlink interface
1893 *
1894 * This initialization function registers the nfc netlink family.
1895 */
nfc_genl_init(void)1896 int __init nfc_genl_init(void)
1897 {
1898 int rc;
1899
1900 rc = genl_register_family(&nfc_genl_family);
1901 if (rc)
1902 return rc;
1903
1904 netlink_register_notifier(&nl_notifier);
1905
1906 return 0;
1907 }
1908
1909 /**
1910 * nfc_genl_exit() - Deinitialize netlink interface
1911 *
1912 * This exit function unregisters the nfc netlink family.
1913 */
nfc_genl_exit(void)1914 void nfc_genl_exit(void)
1915 {
1916 netlink_unregister_notifier(&nl_notifier);
1917 genl_unregister_family(&nfc_genl_family);
1918 }
1919