]> git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - net/nfc/netlink.c
Merge tag 'nfc-next-3.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo...
[mirror_ubuntu-jammy-kernel.git] / net / nfc / netlink.c
1 /*
2 * Copyright (C) 2011 Instituto Nokia de Tecnologia
3 *
4 * Authors:
5 * Lauro Ramos Venancio <lauro.venancio@openbossa.org>
6 * Aloisio Almeida Jr <aloisio.almeida@openbossa.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the
20 * Free Software Foundation, Inc.,
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 */
23
24 #define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
25
26 #include <net/genetlink.h>
27 #include <linux/nfc.h>
28 #include <linux/slab.h>
29
30 #include "nfc.h"
31
32 static struct genl_multicast_group nfc_genl_event_mcgrp = {
33 .name = NFC_GENL_MCAST_EVENT_NAME,
34 };
35
36 static struct genl_family nfc_genl_family = {
37 .id = GENL_ID_GENERATE,
38 .hdrsize = 0,
39 .name = NFC_GENL_NAME,
40 .version = NFC_GENL_VERSION,
41 .maxattr = NFC_ATTR_MAX,
42 };
43
44 static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
45 [NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
46 [NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
47 .len = NFC_DEVICE_NAME_MAXSIZE },
48 [NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
49 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
50 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
51 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
52 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
53 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
54 };
55
56 static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
57 struct netlink_callback *cb, int flags)
58 {
59 void *hdr;
60
61 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
62 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
63 if (!hdr)
64 return -EMSGSIZE;
65
66 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
67
68 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
69 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
70 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
71 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
72 goto nla_put_failure;
73 if (target->nfcid1_len > 0 &&
74 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
75 target->nfcid1))
76 goto nla_put_failure;
77 if (target->sensb_res_len > 0 &&
78 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
79 target->sensb_res))
80 goto nla_put_failure;
81 if (target->sensf_res_len > 0 &&
82 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
83 target->sensf_res))
84 goto nla_put_failure;
85
86 return genlmsg_end(msg, hdr);
87
88 nla_put_failure:
89 genlmsg_cancel(msg, hdr);
90 return -EMSGSIZE;
91 }
92
93 static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
94 {
95 struct nfc_dev *dev;
96 int rc;
97 u32 idx;
98
99 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
100 nfc_genl_family.attrbuf,
101 nfc_genl_family.maxattr,
102 nfc_genl_policy);
103 if (rc < 0)
104 return ERR_PTR(rc);
105
106 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
107 return ERR_PTR(-EINVAL);
108
109 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
110
111 dev = nfc_get_device(idx);
112 if (!dev)
113 return ERR_PTR(-ENODEV);
114
115 return dev;
116 }
117
118 static int nfc_genl_dump_targets(struct sk_buff *skb,
119 struct netlink_callback *cb)
120 {
121 int i = cb->args[0];
122 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
123 int rc;
124
125 if (!dev) {
126 dev = __get_device_from_cb(cb);
127 if (IS_ERR(dev))
128 return PTR_ERR(dev);
129
130 cb->args[1] = (long) dev;
131 }
132
133 device_lock(&dev->dev);
134
135 cb->seq = dev->targets_generation;
136
137 while (i < dev->n_targets) {
138 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
139 NLM_F_MULTI);
140 if (rc < 0)
141 break;
142
143 i++;
144 }
145
146 device_unlock(&dev->dev);
147
148 cb->args[0] = i;
149
150 return skb->len;
151 }
152
153 static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
154 {
155 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
156
157 if (dev)
158 nfc_put_device(dev);
159
160 return 0;
161 }
162
163 int nfc_genl_targets_found(struct nfc_dev *dev)
164 {
165 struct sk_buff *msg;
166 void *hdr;
167
168 dev->genl_data.poll_req_pid = 0;
169
170 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
171 if (!msg)
172 return -ENOMEM;
173
174 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
175 NFC_EVENT_TARGETS_FOUND);
176 if (!hdr)
177 goto free_msg;
178
179 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
180 goto nla_put_failure;
181
182 genlmsg_end(msg, hdr);
183
184 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
185
186 nla_put_failure:
187 genlmsg_cancel(msg, hdr);
188 free_msg:
189 nlmsg_free(msg);
190 return -EMSGSIZE;
191 }
192
193 int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
194 {
195 struct sk_buff *msg;
196 void *hdr;
197
198 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
199 if (!msg)
200 return -ENOMEM;
201
202 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
203 NFC_EVENT_TARGET_LOST);
204 if (!hdr)
205 goto free_msg;
206
207 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
208 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
209 goto nla_put_failure;
210
211 genlmsg_end(msg, hdr);
212
213 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
214
215 return 0;
216
217 nla_put_failure:
218 genlmsg_cancel(msg, hdr);
219 free_msg:
220 nlmsg_free(msg);
221 return -EMSGSIZE;
222 }
223
224 int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
225 {
226 struct sk_buff *msg;
227 void *hdr;
228
229 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
230 if (!msg)
231 return -ENOMEM;
232
233 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
234 NFC_EVENT_TM_ACTIVATED);
235 if (!hdr)
236 goto free_msg;
237
238 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
239 goto nla_put_failure;
240 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
241 goto nla_put_failure;
242
243 genlmsg_end(msg, hdr);
244
245 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
246
247 return 0;
248
249 nla_put_failure:
250 genlmsg_cancel(msg, hdr);
251 free_msg:
252 nlmsg_free(msg);
253 return -EMSGSIZE;
254 }
255
256 int nfc_genl_tm_deactivated(struct nfc_dev *dev)
257 {
258 struct sk_buff *msg;
259 void *hdr;
260
261 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
262 if (!msg)
263 return -ENOMEM;
264
265 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
266 NFC_EVENT_TM_DEACTIVATED);
267 if (!hdr)
268 goto free_msg;
269
270 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
271 goto nla_put_failure;
272
273 genlmsg_end(msg, hdr);
274
275 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
276
277 return 0;
278
279 nla_put_failure:
280 genlmsg_cancel(msg, hdr);
281 free_msg:
282 nlmsg_free(msg);
283 return -EMSGSIZE;
284 }
285
286 int nfc_genl_device_added(struct nfc_dev *dev)
287 {
288 struct sk_buff *msg;
289 void *hdr;
290
291 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
292 if (!msg)
293 return -ENOMEM;
294
295 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
296 NFC_EVENT_DEVICE_ADDED);
297 if (!hdr)
298 goto free_msg;
299
300 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
301 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
302 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
303 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
304 goto nla_put_failure;
305
306 genlmsg_end(msg, hdr);
307
308 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
309
310 return 0;
311
312 nla_put_failure:
313 genlmsg_cancel(msg, hdr);
314 free_msg:
315 nlmsg_free(msg);
316 return -EMSGSIZE;
317 }
318
319 int nfc_genl_device_removed(struct nfc_dev *dev)
320 {
321 struct sk_buff *msg;
322 void *hdr;
323
324 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
325 if (!msg)
326 return -ENOMEM;
327
328 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
329 NFC_EVENT_DEVICE_REMOVED);
330 if (!hdr)
331 goto free_msg;
332
333 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
334 goto nla_put_failure;
335
336 genlmsg_end(msg, hdr);
337
338 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
339
340 return 0;
341
342 nla_put_failure:
343 genlmsg_cancel(msg, hdr);
344 free_msg:
345 nlmsg_free(msg);
346 return -EMSGSIZE;
347 }
348
349 static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
350 u32 pid, u32 seq,
351 struct netlink_callback *cb,
352 int flags)
353 {
354 void *hdr;
355
356 hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
357 NFC_CMD_GET_DEVICE);
358 if (!hdr)
359 return -EMSGSIZE;
360
361 if (cb)
362 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
363
364 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
365 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
366 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
367 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
368 goto nla_put_failure;
369
370 return genlmsg_end(msg, hdr);
371
372 nla_put_failure:
373 genlmsg_cancel(msg, hdr);
374 return -EMSGSIZE;
375 }
376
377 static int nfc_genl_dump_devices(struct sk_buff *skb,
378 struct netlink_callback *cb)
379 {
380 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
381 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
382 bool first_call = false;
383
384 if (!iter) {
385 first_call = true;
386 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
387 if (!iter)
388 return -ENOMEM;
389 cb->args[0] = (long) iter;
390 }
391
392 mutex_lock(&nfc_devlist_mutex);
393
394 cb->seq = nfc_devlist_generation;
395
396 if (first_call) {
397 nfc_device_iter_init(iter);
398 dev = nfc_device_iter_next(iter);
399 }
400
401 while (dev) {
402 int rc;
403
404 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
405 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
406 if (rc < 0)
407 break;
408
409 dev = nfc_device_iter_next(iter);
410 }
411
412 mutex_unlock(&nfc_devlist_mutex);
413
414 cb->args[1] = (long) dev;
415
416 return skb->len;
417 }
418
419 static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
420 {
421 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
422
423 nfc_device_iter_exit(iter);
424 kfree(iter);
425
426 return 0;
427 }
428
429 int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
430 u8 comm_mode, u8 rf_mode)
431 {
432 struct sk_buff *msg;
433 void *hdr;
434
435 pr_debug("DEP link is up\n");
436
437 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
438 if (!msg)
439 return -ENOMEM;
440
441 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
442 if (!hdr)
443 goto free_msg;
444
445 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
446 goto nla_put_failure;
447 if (rf_mode == NFC_RF_INITIATOR &&
448 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
449 goto nla_put_failure;
450 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
451 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
452 goto nla_put_failure;
453
454 genlmsg_end(msg, hdr);
455
456 dev->dep_link_up = true;
457
458 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
459
460 return 0;
461
462 nla_put_failure:
463 genlmsg_cancel(msg, hdr);
464 free_msg:
465 nlmsg_free(msg);
466 return -EMSGSIZE;
467 }
468
469 int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
470 {
471 struct sk_buff *msg;
472 void *hdr;
473
474 pr_debug("DEP link is down\n");
475
476 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
477 if (!msg)
478 return -ENOMEM;
479
480 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
481 NFC_CMD_DEP_LINK_DOWN);
482 if (!hdr)
483 goto free_msg;
484
485 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
486 goto nla_put_failure;
487
488 genlmsg_end(msg, hdr);
489
490 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
491
492 return 0;
493
494 nla_put_failure:
495 genlmsg_cancel(msg, hdr);
496 free_msg:
497 nlmsg_free(msg);
498 return -EMSGSIZE;
499 }
500
501 static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
502 {
503 struct sk_buff *msg;
504 struct nfc_dev *dev;
505 u32 idx;
506 int rc = -ENOBUFS;
507
508 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
509 return -EINVAL;
510
511 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
512
513 dev = nfc_get_device(idx);
514 if (!dev)
515 return -ENODEV;
516
517 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
518 if (!msg) {
519 rc = -ENOMEM;
520 goto out_putdev;
521 }
522
523 rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
524 NULL, 0);
525 if (rc < 0)
526 goto out_free;
527
528 nfc_put_device(dev);
529
530 return genlmsg_reply(msg, info);
531
532 out_free:
533 nlmsg_free(msg);
534 out_putdev:
535 nfc_put_device(dev);
536 return rc;
537 }
538
539 static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
540 {
541 struct nfc_dev *dev;
542 int rc;
543 u32 idx;
544
545 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
546 return -EINVAL;
547
548 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
549
550 dev = nfc_get_device(idx);
551 if (!dev)
552 return -ENODEV;
553
554 rc = nfc_dev_up(dev);
555
556 nfc_put_device(dev);
557 return rc;
558 }
559
560 static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
561 {
562 struct nfc_dev *dev;
563 int rc;
564 u32 idx;
565
566 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
567 return -EINVAL;
568
569 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
570
571 dev = nfc_get_device(idx);
572 if (!dev)
573 return -ENODEV;
574
575 rc = nfc_dev_down(dev);
576
577 nfc_put_device(dev);
578 return rc;
579 }
580
581 static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
582 {
583 struct nfc_dev *dev;
584 int rc;
585 u32 idx;
586 u32 im_protocols = 0, tm_protocols = 0;
587
588 pr_debug("Poll start\n");
589
590 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
591 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
592 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
593 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
594 return -EINVAL;
595
596 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
597
598 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
599 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
600
601 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
602 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
603 else if (info->attrs[NFC_ATTR_PROTOCOLS])
604 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
605
606 dev = nfc_get_device(idx);
607 if (!dev)
608 return -ENODEV;
609
610 mutex_lock(&dev->genl_data.genl_data_mutex);
611
612 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
613 if (!rc)
614 dev->genl_data.poll_req_pid = info->snd_pid;
615
616 mutex_unlock(&dev->genl_data.genl_data_mutex);
617
618 nfc_put_device(dev);
619 return rc;
620 }
621
622 static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
623 {
624 struct nfc_dev *dev;
625 int rc;
626 u32 idx;
627
628 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
629 return -EINVAL;
630
631 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
632
633 dev = nfc_get_device(idx);
634 if (!dev)
635 return -ENODEV;
636
637 device_lock(&dev->dev);
638
639 if (!dev->polling) {
640 device_unlock(&dev->dev);
641 return -EINVAL;
642 }
643
644 device_unlock(&dev->dev);
645
646 mutex_lock(&dev->genl_data.genl_data_mutex);
647
648 if (dev->genl_data.poll_req_pid != info->snd_pid) {
649 rc = -EBUSY;
650 goto out;
651 }
652
653 rc = nfc_stop_poll(dev);
654 dev->genl_data.poll_req_pid = 0;
655
656 out:
657 mutex_unlock(&dev->genl_data.genl_data_mutex);
658 nfc_put_device(dev);
659 return rc;
660 }
661
662 static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
663 {
664 struct nfc_dev *dev;
665 int rc, tgt_idx;
666 u32 idx;
667 u8 comm;
668
669 pr_debug("DEP link up\n");
670
671 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
672 !info->attrs[NFC_ATTR_COMM_MODE])
673 return -EINVAL;
674
675 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
676 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
677 tgt_idx = NFC_TARGET_IDX_ANY;
678 else
679 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
680
681 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
682
683 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
684 return -EINVAL;
685
686 dev = nfc_get_device(idx);
687 if (!dev)
688 return -ENODEV;
689
690 rc = nfc_dep_link_up(dev, tgt_idx, comm);
691
692 nfc_put_device(dev);
693
694 return rc;
695 }
696
697 static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
698 {
699 struct nfc_dev *dev;
700 int rc;
701 u32 idx;
702
703 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
704 return -EINVAL;
705
706 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
707
708 dev = nfc_get_device(idx);
709 if (!dev)
710 return -ENODEV;
711
712 rc = nfc_dep_link_down(dev);
713
714 nfc_put_device(dev);
715 return rc;
716 }
717
718 static struct genl_ops nfc_genl_ops[] = {
719 {
720 .cmd = NFC_CMD_GET_DEVICE,
721 .doit = nfc_genl_get_device,
722 .dumpit = nfc_genl_dump_devices,
723 .done = nfc_genl_dump_devices_done,
724 .policy = nfc_genl_policy,
725 },
726 {
727 .cmd = NFC_CMD_DEV_UP,
728 .doit = nfc_genl_dev_up,
729 .policy = nfc_genl_policy,
730 },
731 {
732 .cmd = NFC_CMD_DEV_DOWN,
733 .doit = nfc_genl_dev_down,
734 .policy = nfc_genl_policy,
735 },
736 {
737 .cmd = NFC_CMD_START_POLL,
738 .doit = nfc_genl_start_poll,
739 .policy = nfc_genl_policy,
740 },
741 {
742 .cmd = NFC_CMD_STOP_POLL,
743 .doit = nfc_genl_stop_poll,
744 .policy = nfc_genl_policy,
745 },
746 {
747 .cmd = NFC_CMD_DEP_LINK_UP,
748 .doit = nfc_genl_dep_link_up,
749 .policy = nfc_genl_policy,
750 },
751 {
752 .cmd = NFC_CMD_DEP_LINK_DOWN,
753 .doit = nfc_genl_dep_link_down,
754 .policy = nfc_genl_policy,
755 },
756 {
757 .cmd = NFC_CMD_GET_TARGET,
758 .dumpit = nfc_genl_dump_targets,
759 .done = nfc_genl_dump_targets_done,
760 .policy = nfc_genl_policy,
761 },
762 };
763
764
765 struct urelease_work {
766 struct work_struct w;
767 int pid;
768 };
769
770 static void nfc_urelease_event_work(struct work_struct *work)
771 {
772 struct urelease_work *w = container_of(work, struct urelease_work, w);
773 struct class_dev_iter iter;
774 struct nfc_dev *dev;
775
776 pr_debug("pid %d\n", w->pid);
777
778 mutex_lock(&nfc_devlist_mutex);
779
780 nfc_device_iter_init(&iter);
781 dev = nfc_device_iter_next(&iter);
782
783 while (dev) {
784 mutex_lock(&dev->genl_data.genl_data_mutex);
785
786 if (dev->genl_data.poll_req_pid == w->pid) {
787 nfc_stop_poll(dev);
788 dev->genl_data.poll_req_pid = 0;
789 }
790
791 mutex_unlock(&dev->genl_data.genl_data_mutex);
792
793 dev = nfc_device_iter_next(&iter);
794 }
795
796 nfc_device_iter_exit(&iter);
797
798 mutex_unlock(&nfc_devlist_mutex);
799
800 kfree(w);
801 }
802
803 static int nfc_genl_rcv_nl_event(struct notifier_block *this,
804 unsigned long event, void *ptr)
805 {
806 struct netlink_notify *n = ptr;
807 struct urelease_work *w;
808
809 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
810 goto out;
811
812 pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
813
814 w = kmalloc(sizeof(*w), GFP_ATOMIC);
815 if (w) {
816 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
817 w->pid = n->pid;
818 schedule_work((struct work_struct *) w);
819 }
820
821 out:
822 return NOTIFY_DONE;
823 }
824
825 void nfc_genl_data_init(struct nfc_genl_data *genl_data)
826 {
827 genl_data->poll_req_pid = 0;
828 mutex_init(&genl_data->genl_data_mutex);
829 }
830
831 void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
832 {
833 mutex_destroy(&genl_data->genl_data_mutex);
834 }
835
836 static struct notifier_block nl_notifier = {
837 .notifier_call = nfc_genl_rcv_nl_event,
838 };
839
840 /**
841 * nfc_genl_init() - Initialize netlink interface
842 *
843 * This initialization function registers the nfc netlink family.
844 */
845 int __init nfc_genl_init(void)
846 {
847 int rc;
848
849 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
850 ARRAY_SIZE(nfc_genl_ops));
851 if (rc)
852 return rc;
853
854 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
855
856 netlink_register_notifier(&nl_notifier);
857
858 return rc;
859 }
860
861 /**
862 * nfc_genl_exit() - Deinitialize netlink interface
863 *
864 * This exit function unregisters the nfc netlink family.
865 */
866 void nfc_genl_exit(void)
867 {
868 netlink_unregister_notifier(&nl_notifier);
869 genl_unregister_family(&nfc_genl_family);
870 }