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v3.5.6
  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
 32static struct genl_multicast_group nfc_genl_event_mcgrp = {
 33	.name = NFC_GENL_MCAST_EVENT_NAME,
 34};
 35
 36static 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
 
 44static 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};
 53
 54static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
 55				struct netlink_callback *cb, int flags)
 56{
 57	void *hdr;
 58
 59	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
 60			  &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
 61	if (!hdr)
 62		return -EMSGSIZE;
 63
 64	genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
 65
 66	if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
 67	    nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
 68	    nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
 69	    nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
 70		goto nla_put_failure;
 71	if (target->nfcid1_len > 0 &&
 72	    nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
 73		    target->nfcid1))
 74		goto nla_put_failure;
 75	if (target->sensb_res_len > 0 &&
 76	    nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
 77		    target->sensb_res))
 78		goto nla_put_failure;
 79	if (target->sensf_res_len > 0 &&
 80	    nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
 81		    target->sensf_res))
 82		goto nla_put_failure;
 83
 84	return genlmsg_end(msg, hdr);
 
 
 
 
 
 
 
 
 
 85
 86nla_put_failure:
 87	genlmsg_cancel(msg, hdr);
 88	return -EMSGSIZE;
 89}
 90
 91static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 92{
 
 93	struct nfc_dev *dev;
 94	int rc;
 95	u32 idx;
 96
 97	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 98			 nfc_genl_family.attrbuf,
 99			 nfc_genl_family.maxattr,
100			 nfc_genl_policy);
101	if (rc < 0)
102		return ERR_PTR(rc);
103
104	if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
105		return ERR_PTR(-EINVAL);
106
107	idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
108
109	dev = nfc_get_device(idx);
110	if (!dev)
111		return ERR_PTR(-ENODEV);
112
113	return dev;
114}
115
116static int nfc_genl_dump_targets(struct sk_buff *skb,
117				 struct netlink_callback *cb)
118{
119	int i = cb->args[0];
120	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
121	int rc;
122
123	if (!dev) {
124		dev = __get_device_from_cb(cb);
125		if (IS_ERR(dev))
126			return PTR_ERR(dev);
127
128		cb->args[1] = (long) dev;
129	}
130
131	device_lock(&dev->dev);
132
133	cb->seq = dev->targets_generation;
134
135	while (i < dev->n_targets) {
136		rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
137					  NLM_F_MULTI);
138		if (rc < 0)
139			break;
140
141		i++;
142	}
143
144	device_unlock(&dev->dev);
145
146	cb->args[0] = i;
147
148	return skb->len;
149}
150
151static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
152{
153	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
154
155	if (dev)
156		nfc_put_device(dev);
157
158	return 0;
159}
160
161int nfc_genl_targets_found(struct nfc_dev *dev)
162{
163	struct sk_buff *msg;
164	void *hdr;
165
166	dev->genl_data.poll_req_pid = 0;
167
168	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
169	if (!msg)
170		return -ENOMEM;
171
172	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
173			  NFC_EVENT_TARGETS_FOUND);
174	if (!hdr)
175		goto free_msg;
176
177	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
178		goto nla_put_failure;
179
180	genlmsg_end(msg, hdr);
181
182	return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
183
184nla_put_failure:
185	genlmsg_cancel(msg, hdr);
186free_msg:
187	nlmsg_free(msg);
188	return -EMSGSIZE;
189}
190
191int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
192{
193	struct sk_buff *msg;
194	void *hdr;
195
196	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
197	if (!msg)
198		return -ENOMEM;
199
200	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
201			  NFC_EVENT_TARGET_LOST);
202	if (!hdr)
203		goto free_msg;
204
205	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
206	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
207		goto nla_put_failure;
208
209	genlmsg_end(msg, hdr);
210
211	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
212
213	return 0;
214
215nla_put_failure:
216	genlmsg_cancel(msg, hdr);
217free_msg:
218	nlmsg_free(msg);
219	return -EMSGSIZE;
220}
221
222int nfc_genl_device_added(struct nfc_dev *dev)
223{
224	struct sk_buff *msg;
225	void *hdr;
226
227	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
228	if (!msg)
229		return -ENOMEM;
230
231	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
232			  NFC_EVENT_DEVICE_ADDED);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
233	if (!hdr)
234		goto free_msg;
235
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
236	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
237	    nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
238	    nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
239	    nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up))
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
240		goto nla_put_failure;
241
242	genlmsg_end(msg, hdr);
243
244	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
245
246	return 0;
247
248nla_put_failure:
249	genlmsg_cancel(msg, hdr);
250free_msg:
251	nlmsg_free(msg);
252	return -EMSGSIZE;
253}
254
255int nfc_genl_device_removed(struct nfc_dev *dev)
256{
257	struct sk_buff *msg;
258	void *hdr;
259
260	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
261	if (!msg)
262		return -ENOMEM;
263
264	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
265			  NFC_EVENT_DEVICE_REMOVED);
266	if (!hdr)
267		goto free_msg;
268
269	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
270		goto nla_put_failure;
271
272	genlmsg_end(msg, hdr);
273
274	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
275
276	return 0;
277
278nla_put_failure:
279	genlmsg_cancel(msg, hdr);
280free_msg:
281	nlmsg_free(msg);
282	return -EMSGSIZE;
283}
284
285static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
286				u32 pid, u32 seq,
287				struct netlink_callback *cb,
288				int flags)
289{
290	void *hdr;
291
292	hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
293			  NFC_CMD_GET_DEVICE);
294	if (!hdr)
295		return -EMSGSIZE;
296
297	if (cb)
298		genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
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	return genlmsg_end(msg, hdr);
 
307
308nla_put_failure:
309	genlmsg_cancel(msg, hdr);
310	return -EMSGSIZE;
311}
312
313static int nfc_genl_dump_devices(struct sk_buff *skb,
314				 struct netlink_callback *cb)
315{
316	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
317	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
318	bool first_call = false;
319
320	if (!iter) {
321		first_call = true;
322		iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
323		if (!iter)
324			return -ENOMEM;
325		cb->args[0] = (long) iter;
326	}
327
328	mutex_lock(&nfc_devlist_mutex);
329
330	cb->seq = nfc_devlist_generation;
331
332	if (first_call) {
333		nfc_device_iter_init(iter);
334		dev = nfc_device_iter_next(iter);
335	}
336
337	while (dev) {
338		int rc;
339
340		rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
341					  cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
342		if (rc < 0)
343			break;
344
345		dev = nfc_device_iter_next(iter);
346	}
347
348	mutex_unlock(&nfc_devlist_mutex);
349
350	cb->args[1] = (long) dev;
351
352	return skb->len;
353}
354
355static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
356{
357	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
358
359	nfc_device_iter_exit(iter);
360	kfree(iter);
361
362	return 0;
363}
364
365int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
366			       u8 comm_mode, u8 rf_mode)
367{
368	struct sk_buff *msg;
369	void *hdr;
370
371	pr_debug("DEP link is up\n");
372
373	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
374	if (!msg)
375		return -ENOMEM;
376
377	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
378	if (!hdr)
379		goto free_msg;
380
381	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
382		goto nla_put_failure;
383	if (rf_mode == NFC_RF_INITIATOR &&
384	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
385		goto nla_put_failure;
386	if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
387	    nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
388		goto nla_put_failure;
389
390	genlmsg_end(msg, hdr);
391
392	dev->dep_link_up = true;
393
394	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
395
396	return 0;
397
398nla_put_failure:
399	genlmsg_cancel(msg, hdr);
400free_msg:
401	nlmsg_free(msg);
402	return -EMSGSIZE;
403}
404
405int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
406{
407	struct sk_buff *msg;
408	void *hdr;
409
410	pr_debug("DEP link is down\n");
411
412	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
413	if (!msg)
414		return -ENOMEM;
415
416	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
417			  NFC_CMD_DEP_LINK_DOWN);
418	if (!hdr)
419		goto free_msg;
420
421	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
422		goto nla_put_failure;
423
424	genlmsg_end(msg, hdr);
425
426	genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
427
428	return 0;
429
430nla_put_failure:
431	genlmsg_cancel(msg, hdr);
432free_msg:
433	nlmsg_free(msg);
434	return -EMSGSIZE;
435}
436
437static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
438{
439	struct sk_buff *msg;
440	struct nfc_dev *dev;
441	u32 idx;
442	int rc = -ENOBUFS;
443
444	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
445		return -EINVAL;
446
447	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
448
449	dev = nfc_get_device(idx);
450	if (!dev)
451		return -ENODEV;
452
453	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
454	if (!msg) {
455		rc = -ENOMEM;
456		goto out_putdev;
457	}
458
459	rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
460				  NULL, 0);
461	if (rc < 0)
462		goto out_free;
463
464	nfc_put_device(dev);
465
466	return genlmsg_reply(msg, info);
467
468out_free:
469	nlmsg_free(msg);
470out_putdev:
471	nfc_put_device(dev);
472	return rc;
473}
474
475static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
476{
477	struct nfc_dev *dev;
478	int rc;
479	u32 idx;
480
481	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
482		return -EINVAL;
483
484	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
485
486	dev = nfc_get_device(idx);
487	if (!dev)
488		return -ENODEV;
489
490	rc = nfc_dev_up(dev);
491
492	nfc_put_device(dev);
493	return rc;
494}
495
496static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
497{
498	struct nfc_dev *dev;
499	int rc;
500	u32 idx;
501
502	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
503		return -EINVAL;
504
505	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
506
507	dev = nfc_get_device(idx);
508	if (!dev)
509		return -ENODEV;
510
511	rc = nfc_dev_down(dev);
512
513	nfc_put_device(dev);
514	return rc;
515}
516
517static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
518{
519	struct nfc_dev *dev;
520	int rc;
521	u32 idx;
522	u32 protocols;
523
524	pr_debug("Poll start\n");
525
526	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
527	    !info->attrs[NFC_ATTR_PROTOCOLS])
 
 
528		return -EINVAL;
529
530	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
531	protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 
 
 
 
 
 
 
532
533	dev = nfc_get_device(idx);
534	if (!dev)
535		return -ENODEV;
536
537	mutex_lock(&dev->genl_data.genl_data_mutex);
538
539	rc = nfc_start_poll(dev, protocols);
540	if (!rc)
541		dev->genl_data.poll_req_pid = info->snd_pid;
542
543	mutex_unlock(&dev->genl_data.genl_data_mutex);
544
545	nfc_put_device(dev);
546	return rc;
547}
548
549static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
550{
551	struct nfc_dev *dev;
552	int rc;
553	u32 idx;
554
555	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
556		return -EINVAL;
557
558	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
559
560	dev = nfc_get_device(idx);
561	if (!dev)
562		return -ENODEV;
563
 
 
 
 
 
 
 
 
 
564	mutex_lock(&dev->genl_data.genl_data_mutex);
565
566	if (dev->genl_data.poll_req_pid != info->snd_pid) {
567		rc = -EBUSY;
568		goto out;
569	}
570
571	rc = nfc_stop_poll(dev);
572	dev->genl_data.poll_req_pid = 0;
573
574out:
575	mutex_unlock(&dev->genl_data.genl_data_mutex);
576	nfc_put_device(dev);
577	return rc;
578}
579
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
580static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
581{
582	struct nfc_dev *dev;
583	int rc, tgt_idx;
584	u32 idx;
585	u8 comm;
586
587	pr_debug("DEP link up\n");
588
589	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
590	    !info->attrs[NFC_ATTR_COMM_MODE])
591		return -EINVAL;
592
593	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
594	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
595		tgt_idx = NFC_TARGET_IDX_ANY;
596	else
597		tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
598
599	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
600
601	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
602		return -EINVAL;
603
604	dev = nfc_get_device(idx);
605	if (!dev)
606		return -ENODEV;
607
608	rc = nfc_dep_link_up(dev, tgt_idx, comm);
609
610	nfc_put_device(dev);
611
612	return rc;
613}
614
615static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
616{
617	struct nfc_dev *dev;
618	int rc;
619	u32 idx;
620
621	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
622		return -EINVAL;
623
624	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
625
626	dev = nfc_get_device(idx);
627	if (!dev)
628		return -ENODEV;
629
630	rc = nfc_dep_link_down(dev);
631
632	nfc_put_device(dev);
633	return rc;
634}
635
636static struct genl_ops nfc_genl_ops[] = {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
637	{
638		.cmd = NFC_CMD_GET_DEVICE,
639		.doit = nfc_genl_get_device,
640		.dumpit = nfc_genl_dump_devices,
641		.done = nfc_genl_dump_devices_done,
642		.policy = nfc_genl_policy,
643	},
644	{
645		.cmd = NFC_CMD_DEV_UP,
646		.doit = nfc_genl_dev_up,
647		.policy = nfc_genl_policy,
648	},
649	{
650		.cmd = NFC_CMD_DEV_DOWN,
651		.doit = nfc_genl_dev_down,
652		.policy = nfc_genl_policy,
653	},
654	{
655		.cmd = NFC_CMD_START_POLL,
656		.doit = nfc_genl_start_poll,
657		.policy = nfc_genl_policy,
658	},
659	{
660		.cmd = NFC_CMD_STOP_POLL,
661		.doit = nfc_genl_stop_poll,
662		.policy = nfc_genl_policy,
663	},
664	{
665		.cmd = NFC_CMD_DEP_LINK_UP,
666		.doit = nfc_genl_dep_link_up,
667		.policy = nfc_genl_policy,
668	},
669	{
670		.cmd = NFC_CMD_DEP_LINK_DOWN,
671		.doit = nfc_genl_dep_link_down,
672		.policy = nfc_genl_policy,
673	},
674	{
675		.cmd = NFC_CMD_GET_TARGET,
676		.dumpit = nfc_genl_dump_targets,
677		.done = nfc_genl_dump_targets_done,
678		.policy = nfc_genl_policy,
679	},
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
680};
681
682static int nfc_genl_rcv_nl_event(struct notifier_block *this,
683				 unsigned long event, void *ptr)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
684{
685	struct netlink_notify *n = ptr;
686	struct class_dev_iter iter;
687	struct nfc_dev *dev;
688
689	if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
690		goto out;
691
692	pr_debug("NETLINK_URELEASE event from id %d\n", n->pid);
693
694	nfc_device_iter_init(&iter);
695	dev = nfc_device_iter_next(&iter);
696
697	while (dev) {
698		if (dev->genl_data.poll_req_pid == n->pid) {
 
 
699			nfc_stop_poll(dev);
700			dev->genl_data.poll_req_pid = 0;
701		}
 
 
 
702		dev = nfc_device_iter_next(&iter);
703	}
704
705	nfc_device_iter_exit(&iter);
706
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
707out:
708	return NOTIFY_DONE;
709}
710
711void nfc_genl_data_init(struct nfc_genl_data *genl_data)
712{
713	genl_data->poll_req_pid = 0;
714	mutex_init(&genl_data->genl_data_mutex);
715}
716
717void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
718{
719	mutex_destroy(&genl_data->genl_data_mutex);
720}
721
722static struct notifier_block nl_notifier = {
723	.notifier_call  = nfc_genl_rcv_nl_event,
724};
725
726/**
727 * nfc_genl_init() - Initialize netlink interface
728 *
729 * This initialization function registers the nfc netlink family.
730 */
731int __init nfc_genl_init(void)
732{
733	int rc;
734
735	rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
736					   ARRAY_SIZE(nfc_genl_ops));
737	if (rc)
738		return rc;
739
740	rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
741
742	netlink_register_notifier(&nl_notifier);
743
744	return rc;
745}
746
747/**
748 * nfc_genl_exit() - Deinitialize netlink interface
749 *
750 * This exit function unregisters the nfc netlink family.
751 */
752void nfc_genl_exit(void)
753{
754	netlink_unregister_notifier(&nl_notifier);
755	genl_unregister_family(&nfc_genl_family);
756}
v4.17
   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 * Vendor commands implementation based on net/wireless/nl80211.c
   9 * which is:
  10 *
  11 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
  12 * Copyright 2013-2014  Intel Mobile Communications GmbH
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License as published by
  16 * the Free Software Foundation; either version 2 of the License, or
  17 * (at your option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful,
  20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22 * GNU General Public License for more details.
  23 *
  24 * You should have received a copy of the GNU General Public License
  25 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 
  26 */
  27
  28#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
  29
  30#include <net/genetlink.h>
  31#include <linux/nfc.h>
  32#include <linux/slab.h>
  33
  34#include "nfc.h"
  35#include "llcp.h"
  36
  37static const struct genl_multicast_group nfc_genl_mcgrps[] = {
  38	{ .name = NFC_GENL_MCAST_EVENT_NAME, },
 
 
 
 
 
 
 
 
  39};
  40
  41static struct genl_family nfc_genl_family;
  42static const struct nla_policy nfc_genl_policy[NFC_ATTR_MAX + 1] = {
  43	[NFC_ATTR_DEVICE_INDEX] = { .type = NLA_U32 },
  44	[NFC_ATTR_DEVICE_NAME] = { .type = NLA_STRING,
  45				.len = NFC_DEVICE_NAME_MAXSIZE },
  46	[NFC_ATTR_PROTOCOLS] = { .type = NLA_U32 },
  47	[NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
  48	[NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
  49	[NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
  50	[NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
  51	[NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
  52	[NFC_ATTR_LLC_PARAM_LTO] = { .type = NLA_U8 },
  53	[NFC_ATTR_LLC_PARAM_RW] = { .type = NLA_U8 },
  54	[NFC_ATTR_LLC_PARAM_MIUX] = { .type = NLA_U16 },
  55	[NFC_ATTR_LLC_SDP] = { .type = NLA_NESTED },
  56	[NFC_ATTR_FIRMWARE_NAME] = { .type = NLA_STRING,
  57				     .len = NFC_FIRMWARE_NAME_MAXSIZE },
  58	[NFC_ATTR_SE_APDU] = { .type = NLA_BINARY },
  59	[NFC_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
  60
  61};
  62
  63static const struct nla_policy nfc_sdp_genl_policy[NFC_SDP_ATTR_MAX + 1] = {
  64	[NFC_SDP_ATTR_URI] = { .type = NLA_STRING,
  65			       .len = U8_MAX - 4 },
  66	[NFC_SDP_ATTR_SAP] = { .type = NLA_U8 },
  67};
  68
  69static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
  70				struct netlink_callback *cb, int flags)
  71{
  72	void *hdr;
  73
  74	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  75			  &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
  76	if (!hdr)
  77		return -EMSGSIZE;
  78
  79	genl_dump_check_consistent(cb, hdr);
  80
  81	if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
  82	    nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
  83	    nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
  84	    nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
  85		goto nla_put_failure;
  86	if (target->nfcid1_len > 0 &&
  87	    nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
  88		    target->nfcid1))
  89		goto nla_put_failure;
  90	if (target->sensb_res_len > 0 &&
  91	    nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
  92		    target->sensb_res))
  93		goto nla_put_failure;
  94	if (target->sensf_res_len > 0 &&
  95	    nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
  96		    target->sensf_res))
  97		goto nla_put_failure;
  98
  99	if (target->is_iso15693) {
 100		if (nla_put_u8(msg, NFC_ATTR_TARGET_ISO15693_DSFID,
 101			       target->iso15693_dsfid) ||
 102		    nla_put(msg, NFC_ATTR_TARGET_ISO15693_UID,
 103			    sizeof(target->iso15693_uid), target->iso15693_uid))
 104			goto nla_put_failure;
 105	}
 106
 107	genlmsg_end(msg, hdr);
 108	return 0;
 109
 110nla_put_failure:
 111	genlmsg_cancel(msg, hdr);
 112	return -EMSGSIZE;
 113}
 114
 115static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
 116{
 117	struct nlattr **attrbuf = genl_family_attrbuf(&nfc_genl_family);
 118	struct nfc_dev *dev;
 119	int rc;
 120	u32 idx;
 121
 122	rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
 123			 attrbuf, nfc_genl_family.maxattr, nfc_genl_policy,
 124			 NULL);
 
 125	if (rc < 0)
 126		return ERR_PTR(rc);
 127
 128	if (!attrbuf[NFC_ATTR_DEVICE_INDEX])
 129		return ERR_PTR(-EINVAL);
 130
 131	idx = nla_get_u32(attrbuf[NFC_ATTR_DEVICE_INDEX]);
 132
 133	dev = nfc_get_device(idx);
 134	if (!dev)
 135		return ERR_PTR(-ENODEV);
 136
 137	return dev;
 138}
 139
 140static int nfc_genl_dump_targets(struct sk_buff *skb,
 141				 struct netlink_callback *cb)
 142{
 143	int i = cb->args[0];
 144	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 145	int rc;
 146
 147	if (!dev) {
 148		dev = __get_device_from_cb(cb);
 149		if (IS_ERR(dev))
 150			return PTR_ERR(dev);
 151
 152		cb->args[1] = (long) dev;
 153	}
 154
 155	device_lock(&dev->dev);
 156
 157	cb->seq = dev->targets_generation;
 158
 159	while (i < dev->n_targets) {
 160		rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
 161					  NLM_F_MULTI);
 162		if (rc < 0)
 163			break;
 164
 165		i++;
 166	}
 167
 168	device_unlock(&dev->dev);
 169
 170	cb->args[0] = i;
 171
 172	return skb->len;
 173}
 174
 175static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
 176{
 177	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 178
 179	if (dev)
 180		nfc_put_device(dev);
 181
 182	return 0;
 183}
 184
 185int nfc_genl_targets_found(struct nfc_dev *dev)
 186{
 187	struct sk_buff *msg;
 188	void *hdr;
 189
 190	dev->genl_data.poll_req_portid = 0;
 191
 192	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 193	if (!msg)
 194		return -ENOMEM;
 195
 196	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 197			  NFC_EVENT_TARGETS_FOUND);
 198	if (!hdr)
 199		goto free_msg;
 200
 201	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 202		goto nla_put_failure;
 203
 204	genlmsg_end(msg, hdr);
 205
 206	return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 207
 208nla_put_failure:
 209	genlmsg_cancel(msg, hdr);
 210free_msg:
 211	nlmsg_free(msg);
 212	return -EMSGSIZE;
 213}
 214
 215int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
 216{
 217	struct sk_buff *msg;
 218	void *hdr;
 219
 220	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 221	if (!msg)
 222		return -ENOMEM;
 223
 224	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 225			  NFC_EVENT_TARGET_LOST);
 226	if (!hdr)
 227		goto free_msg;
 228
 229	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 230	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 231		goto nla_put_failure;
 232
 233	genlmsg_end(msg, hdr);
 234
 235	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 236
 237	return 0;
 238
 239nla_put_failure:
 240	genlmsg_cancel(msg, hdr);
 241free_msg:
 242	nlmsg_free(msg);
 243	return -EMSGSIZE;
 244}
 245
 246int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
 247{
 248	struct sk_buff *msg;
 249	void *hdr;
 250
 251	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 252	if (!msg)
 253		return -ENOMEM;
 254
 255	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 256			  NFC_EVENT_TM_ACTIVATED);
 257	if (!hdr)
 258		goto free_msg;
 259
 260	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 261		goto nla_put_failure;
 262	if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
 263		goto nla_put_failure;
 264
 265	genlmsg_end(msg, hdr);
 266
 267	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 268
 269	return 0;
 270
 271nla_put_failure:
 272	genlmsg_cancel(msg, hdr);
 273free_msg:
 274	nlmsg_free(msg);
 275	return -EMSGSIZE;
 276}
 277
 278int nfc_genl_tm_deactivated(struct nfc_dev *dev)
 279{
 280	struct sk_buff *msg;
 281	void *hdr;
 282
 283	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 284	if (!msg)
 285		return -ENOMEM;
 286
 287	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 288			  NFC_EVENT_TM_DEACTIVATED);
 289	if (!hdr)
 290		goto free_msg;
 291
 292	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 293		goto nla_put_failure;
 294
 295	genlmsg_end(msg, hdr);
 296
 297	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 298
 299	return 0;
 300
 301nla_put_failure:
 302	genlmsg_cancel(msg, hdr);
 303free_msg:
 304	nlmsg_free(msg);
 305	return -EMSGSIZE;
 306}
 307
 308static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
 309{
 310	if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
 311	    nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 312	    nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
 313	    nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
 314	    nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
 315		return -1;
 316	return 0;
 317}
 318
 319int nfc_genl_device_added(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_ADDED);
 330	if (!hdr)
 331		goto free_msg;
 332
 333	if (nfc_genl_setup_device_added(dev, msg))
 334		goto nla_put_failure;
 335
 336	genlmsg_end(msg, hdr);
 337
 338	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 339
 340	return 0;
 341
 342nla_put_failure:
 343	genlmsg_cancel(msg, hdr);
 344free_msg:
 345	nlmsg_free(msg);
 346	return -EMSGSIZE;
 347}
 348
 349int nfc_genl_device_removed(struct nfc_dev *dev)
 350{
 351	struct sk_buff *msg;
 352	void *hdr;
 353
 354	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 355	if (!msg)
 356		return -ENOMEM;
 357
 358	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 359			  NFC_EVENT_DEVICE_REMOVED);
 360	if (!hdr)
 361		goto free_msg;
 362
 363	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 364		goto nla_put_failure;
 365
 366	genlmsg_end(msg, hdr);
 367
 368	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 369
 370	return 0;
 371
 372nla_put_failure:
 373	genlmsg_cancel(msg, hdr);
 374free_msg:
 375	nlmsg_free(msg);
 376	return -EMSGSIZE;
 377}
 378
 379int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
 380{
 381	struct sk_buff *msg;
 382	struct nlattr *sdp_attr, *uri_attr;
 383	struct nfc_llcp_sdp_tlv *sdres;
 384	struct hlist_node *n;
 385	void *hdr;
 386	int rc = -EMSGSIZE;
 387	int i;
 388
 389	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 390	if (!msg)
 391		return -ENOMEM;
 392
 393	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 394			  NFC_EVENT_LLC_SDRES);
 395	if (!hdr)
 396		goto free_msg;
 397
 398	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 399		goto nla_put_failure;
 400
 401	sdp_attr = nla_nest_start(msg, NFC_ATTR_LLC_SDP);
 402	if (sdp_attr == NULL) {
 403		rc = -ENOMEM;
 404		goto nla_put_failure;
 405	}
 406
 407	i = 1;
 408	hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
 409		pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
 410
 411		uri_attr = nla_nest_start(msg, i++);
 412		if (uri_attr == NULL) {
 413			rc = -ENOMEM;
 414			goto nla_put_failure;
 415		}
 416
 417		if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
 418			goto nla_put_failure;
 419
 420		if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
 421			goto nla_put_failure;
 422
 423		nla_nest_end(msg, uri_attr);
 424
 425		hlist_del(&sdres->node);
 426
 427		nfc_llcp_free_sdp_tlv(sdres);
 428	}
 429
 430	nla_nest_end(msg, sdp_attr);
 431
 432	genlmsg_end(msg, hdr);
 433
 434	return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 435
 436nla_put_failure:
 437	genlmsg_cancel(msg, hdr);
 438
 439free_msg:
 440	nlmsg_free(msg);
 441
 442	nfc_llcp_free_sdp_tlv_list(sdres_list);
 443
 444	return rc;
 445}
 446
 447int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
 448{
 449	struct sk_buff *msg;
 450	void *hdr;
 451
 452	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 453	if (!msg)
 454		return -ENOMEM;
 455
 456	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 457			  NFC_EVENT_SE_ADDED);
 458	if (!hdr)
 459		goto free_msg;
 460
 461	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 462	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 463	    nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
 464		goto nla_put_failure;
 465
 466	genlmsg_end(msg, hdr);
 467
 468	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 469
 470	return 0;
 471
 472nla_put_failure:
 473	genlmsg_cancel(msg, hdr);
 474free_msg:
 475	nlmsg_free(msg);
 476	return -EMSGSIZE;
 477}
 478
 479int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
 480{
 481	struct sk_buff *msg;
 482	void *hdr;
 483
 484	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 485	if (!msg)
 486		return -ENOMEM;
 487
 488	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 489			  NFC_EVENT_SE_REMOVED);
 490	if (!hdr)
 491		goto free_msg;
 492
 493	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 494	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
 495		goto nla_put_failure;
 496
 497	genlmsg_end(msg, hdr);
 498
 499	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 500
 501	return 0;
 502
 503nla_put_failure:
 504	genlmsg_cancel(msg, hdr);
 505free_msg:
 506	nlmsg_free(msg);
 507	return -EMSGSIZE;
 508}
 509
 510int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
 511			    struct nfc_evt_transaction *evt_transaction)
 512{
 513	struct nfc_se *se;
 514	struct sk_buff *msg;
 515	void *hdr;
 516
 517	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 518	if (!msg)
 519		return -ENOMEM;
 520
 521	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 522			  NFC_EVENT_SE_TRANSACTION);
 523	if (!hdr)
 524		goto free_msg;
 525
 526	se = nfc_find_se(dev, se_idx);
 527	if (!se)
 528		goto free_msg;
 529
 530	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 531	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 532	    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
 533	    nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
 534		    evt_transaction->aid) ||
 535	    nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
 536		    evt_transaction->params))
 537		goto nla_put_failure;
 538
 539	/* evt_transaction is no more used */
 540	devm_kfree(&dev->dev, evt_transaction);
 541
 542	genlmsg_end(msg, hdr);
 543
 544	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 545
 546	return 0;
 547
 548nla_put_failure:
 549	genlmsg_cancel(msg, hdr);
 550free_msg:
 551	/* evt_transaction is no more used */
 552	devm_kfree(&dev->dev, evt_transaction);
 553	nlmsg_free(msg);
 554	return -EMSGSIZE;
 555}
 556
 557int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
 558{
 559	struct nfc_se *se;
 560	struct sk_buff *msg;
 561	void *hdr;
 562
 563	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 564	if (!msg)
 565		return -ENOMEM;
 566
 567	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 568			  NFC_EVENT_SE_CONNECTIVITY);
 569	if (!hdr)
 570		goto free_msg;
 571
 572	se = nfc_find_se(dev, se_idx);
 573	if (!se)
 574		goto free_msg;
 575
 576	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
 577	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
 578	    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
 579		goto nla_put_failure;
 580
 581	genlmsg_end(msg, hdr);
 582
 583	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
 584
 585	return 0;
 586
 587nla_put_failure:
 588	genlmsg_cancel(msg, hdr);
 589free_msg:
 590	nlmsg_free(msg);
 591	return -EMSGSIZE;
 592}
 593
 594static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
 595				u32 portid, u32 seq,
 596				struct netlink_callback *cb,
 597				int flags)
 598{
 599	void *hdr;
 600
 601	hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
 602			  NFC_CMD_GET_DEVICE);
 603	if (!hdr)
 604		return -EMSGSIZE;
 605
 606	if (cb)
 607		genl_dump_check_consistent(cb, hdr);
 608
 609	if (nfc_genl_setup_device_added(dev, msg))
 
 
 
 610		goto nla_put_failure;
 611
 612	genlmsg_end(msg, hdr);
 613	return 0;
 614
 615nla_put_failure:
 616	genlmsg_cancel(msg, hdr);
 617	return -EMSGSIZE;
 618}
 619
 620static int nfc_genl_dump_devices(struct sk_buff *skb,
 621				 struct netlink_callback *cb)
 622{
 623	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 624	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
 625	bool first_call = false;
 626
 627	if (!iter) {
 628		first_call = true;
 629		iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
 630		if (!iter)
 631			return -ENOMEM;
 632		cb->args[0] = (long) iter;
 633	}
 634
 635	mutex_lock(&nfc_devlist_mutex);
 636
 637	cb->seq = nfc_devlist_generation;
 638
 639	if (first_call) {
 640		nfc_device_iter_init(iter);
 641		dev = nfc_device_iter_next(iter);
 642	}
 643
 644	while (dev) {
 645		int rc;
 646
 647		rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
 648					  cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
 649		if (rc < 0)
 650			break;
 651
 652		dev = nfc_device_iter_next(iter);
 653	}
 654
 655	mutex_unlock(&nfc_devlist_mutex);
 656
 657	cb->args[1] = (long) dev;
 658
 659	return skb->len;
 660}
 661
 662static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
 663{
 664	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
 665
 666	nfc_device_iter_exit(iter);
 667	kfree(iter);
 668
 669	return 0;
 670}
 671
 672int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
 673			       u8 comm_mode, u8 rf_mode)
 674{
 675	struct sk_buff *msg;
 676	void *hdr;
 677
 678	pr_debug("DEP link is up\n");
 679
 680	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 681	if (!msg)
 682		return -ENOMEM;
 683
 684	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
 685	if (!hdr)
 686		goto free_msg;
 687
 688	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 689		goto nla_put_failure;
 690	if (rf_mode == NFC_RF_INITIATOR &&
 691	    nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
 692		goto nla_put_failure;
 693	if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
 694	    nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
 695		goto nla_put_failure;
 696
 697	genlmsg_end(msg, hdr);
 698
 699	dev->dep_link_up = true;
 700
 701	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 702
 703	return 0;
 704
 705nla_put_failure:
 706	genlmsg_cancel(msg, hdr);
 707free_msg:
 708	nlmsg_free(msg);
 709	return -EMSGSIZE;
 710}
 711
 712int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
 713{
 714	struct sk_buff *msg;
 715	void *hdr;
 716
 717	pr_debug("DEP link is down\n");
 718
 719	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 720	if (!msg)
 721		return -ENOMEM;
 722
 723	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
 724			  NFC_CMD_DEP_LINK_DOWN);
 725	if (!hdr)
 726		goto free_msg;
 727
 728	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
 729		goto nla_put_failure;
 730
 731	genlmsg_end(msg, hdr);
 732
 733	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
 734
 735	return 0;
 736
 737nla_put_failure:
 738	genlmsg_cancel(msg, hdr);
 739free_msg:
 740	nlmsg_free(msg);
 741	return -EMSGSIZE;
 742}
 743
 744static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
 745{
 746	struct sk_buff *msg;
 747	struct nfc_dev *dev;
 748	u32 idx;
 749	int rc = -ENOBUFS;
 750
 751	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 752		return -EINVAL;
 753
 754	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 755
 756	dev = nfc_get_device(idx);
 757	if (!dev)
 758		return -ENODEV;
 759
 760	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 761	if (!msg) {
 762		rc = -ENOMEM;
 763		goto out_putdev;
 764	}
 765
 766	rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
 767				  NULL, 0);
 768	if (rc < 0)
 769		goto out_free;
 770
 771	nfc_put_device(dev);
 772
 773	return genlmsg_reply(msg, info);
 774
 775out_free:
 776	nlmsg_free(msg);
 777out_putdev:
 778	nfc_put_device(dev);
 779	return rc;
 780}
 781
 782static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
 783{
 784	struct nfc_dev *dev;
 785	int rc;
 786	u32 idx;
 787
 788	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 789		return -EINVAL;
 790
 791	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 792
 793	dev = nfc_get_device(idx);
 794	if (!dev)
 795		return -ENODEV;
 796
 797	rc = nfc_dev_up(dev);
 798
 799	nfc_put_device(dev);
 800	return rc;
 801}
 802
 803static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
 804{
 805	struct nfc_dev *dev;
 806	int rc;
 807	u32 idx;
 808
 809	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 810		return -EINVAL;
 811
 812	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 813
 814	dev = nfc_get_device(idx);
 815	if (!dev)
 816		return -ENODEV;
 817
 818	rc = nfc_dev_down(dev);
 819
 820	nfc_put_device(dev);
 821	return rc;
 822}
 823
 824static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
 825{
 826	struct nfc_dev *dev;
 827	int rc;
 828	u32 idx;
 829	u32 im_protocols = 0, tm_protocols = 0;
 830
 831	pr_debug("Poll start\n");
 832
 833	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 834	    ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
 835	      !info->attrs[NFC_ATTR_PROTOCOLS]) &&
 836	      !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
 837		return -EINVAL;
 838
 839	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 840
 841	if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
 842		tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
 843
 844	if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
 845		im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
 846	else if (info->attrs[NFC_ATTR_PROTOCOLS])
 847		im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 848
 849	dev = nfc_get_device(idx);
 850	if (!dev)
 851		return -ENODEV;
 852
 853	mutex_lock(&dev->genl_data.genl_data_mutex);
 854
 855	rc = nfc_start_poll(dev, im_protocols, tm_protocols);
 856	if (!rc)
 857		dev->genl_data.poll_req_portid = info->snd_portid;
 858
 859	mutex_unlock(&dev->genl_data.genl_data_mutex);
 860
 861	nfc_put_device(dev);
 862	return rc;
 863}
 864
 865static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
 866{
 867	struct nfc_dev *dev;
 868	int rc;
 869	u32 idx;
 870
 871	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 872		return -EINVAL;
 873
 874	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 875
 876	dev = nfc_get_device(idx);
 877	if (!dev)
 878		return -ENODEV;
 879
 880	device_lock(&dev->dev);
 881
 882	if (!dev->polling) {
 883		device_unlock(&dev->dev);
 884		return -EINVAL;
 885	}
 886
 887	device_unlock(&dev->dev);
 888
 889	mutex_lock(&dev->genl_data.genl_data_mutex);
 890
 891	if (dev->genl_data.poll_req_portid != info->snd_portid) {
 892		rc = -EBUSY;
 893		goto out;
 894	}
 895
 896	rc = nfc_stop_poll(dev);
 897	dev->genl_data.poll_req_portid = 0;
 898
 899out:
 900	mutex_unlock(&dev->genl_data.genl_data_mutex);
 901	nfc_put_device(dev);
 902	return rc;
 903}
 904
 905static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
 906{
 907	struct nfc_dev *dev;
 908	u32 device_idx, target_idx, protocol;
 909	int rc;
 910
 911	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 912	    !info->attrs[NFC_ATTR_TARGET_INDEX] ||
 913	    !info->attrs[NFC_ATTR_PROTOCOLS])
 914		return -EINVAL;
 915
 916	device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 917
 918	dev = nfc_get_device(device_idx);
 919	if (!dev)
 920		return -ENODEV;
 921
 922	target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 923	protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
 924
 925	nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 926	rc = nfc_activate_target(dev, target_idx, protocol);
 927
 928	nfc_put_device(dev);
 929	return rc;
 930}
 931
 932static int nfc_genl_deactivate_target(struct sk_buff *skb,
 933				      struct genl_info *info)
 934{
 935	struct nfc_dev *dev;
 936	u32 device_idx, target_idx;
 937	int rc;
 938
 939	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 940		return -EINVAL;
 941
 942	device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 943
 944	dev = nfc_get_device(device_idx);
 945	if (!dev)
 946		return -ENODEV;
 947
 948	target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 949
 950	rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
 951
 952	nfc_put_device(dev);
 953	return rc;
 954}
 955
 956static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
 957{
 958	struct nfc_dev *dev;
 959	int rc, tgt_idx;
 960	u32 idx;
 961	u8 comm;
 962
 963	pr_debug("DEP link up\n");
 964
 965	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
 966	    !info->attrs[NFC_ATTR_COMM_MODE])
 967		return -EINVAL;
 968
 969	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 970	if (!info->attrs[NFC_ATTR_TARGET_INDEX])
 971		tgt_idx = NFC_TARGET_IDX_ANY;
 972	else
 973		tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
 974
 975	comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
 976
 977	if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
 978		return -EINVAL;
 979
 980	dev = nfc_get_device(idx);
 981	if (!dev)
 982		return -ENODEV;
 983
 984	rc = nfc_dep_link_up(dev, tgt_idx, comm);
 985
 986	nfc_put_device(dev);
 987
 988	return rc;
 989}
 990
 991static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 992{
 993	struct nfc_dev *dev;
 994	int rc;
 995	u32 idx;
 996
 997	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
 998		return -EINVAL;
 999
1000	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1001
1002	dev = nfc_get_device(idx);
1003	if (!dev)
1004		return -ENODEV;
1005
1006	rc = nfc_dep_link_down(dev);
1007
1008	nfc_put_device(dev);
1009	return rc;
1010}
1011
1012static int nfc_genl_send_params(struct sk_buff *msg,
1013				struct nfc_llcp_local *local,
1014				u32 portid, u32 seq)
1015{
1016	void *hdr;
1017
1018	hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
1019			  NFC_CMD_LLC_GET_PARAMS);
1020	if (!hdr)
1021		return -EMSGSIZE;
1022
1023	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1024	    nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1025	    nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1026	    nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1027		goto nla_put_failure;
1028
1029	genlmsg_end(msg, hdr);
1030	return 0;
1031
1032nla_put_failure:
1033
1034	genlmsg_cancel(msg, hdr);
1035	return -EMSGSIZE;
1036}
1037
1038static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1039{
1040	struct nfc_dev *dev;
1041	struct nfc_llcp_local *local;
1042	int rc = 0;
1043	struct sk_buff *msg = NULL;
1044	u32 idx;
1045
1046	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1047		return -EINVAL;
1048
1049	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1050
1051	dev = nfc_get_device(idx);
1052	if (!dev)
1053		return -ENODEV;
1054
1055	device_lock(&dev->dev);
1056
1057	local = nfc_llcp_find_local(dev);
1058	if (!local) {
1059		rc = -ENODEV;
1060		goto exit;
1061	}
1062
1063	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1064	if (!msg) {
1065		rc = -ENOMEM;
1066		goto exit;
1067	}
1068
1069	rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1070
1071exit:
1072	device_unlock(&dev->dev);
1073
1074	nfc_put_device(dev);
1075
1076	if (rc < 0) {
1077		if (msg)
1078			nlmsg_free(msg);
1079
1080		return rc;
1081	}
1082
1083	return genlmsg_reply(msg, info);
1084}
1085
1086static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1087{
1088	struct nfc_dev *dev;
1089	struct nfc_llcp_local *local;
1090	u8 rw = 0;
1091	u16 miux = 0;
1092	u32 idx;
1093	int rc = 0;
1094
1095	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1096	    (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1097	     !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1098	     !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1099		return -EINVAL;
1100
1101	if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1102		rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1103
1104		if (rw > LLCP_MAX_RW)
1105			return -EINVAL;
1106	}
1107
1108	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1109		miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1110
1111		if (miux > LLCP_MAX_MIUX)
1112			return -EINVAL;
1113	}
1114
1115	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1116
1117	dev = nfc_get_device(idx);
1118	if (!dev)
1119		return -ENODEV;
1120
1121	device_lock(&dev->dev);
1122
1123	local = nfc_llcp_find_local(dev);
1124	if (!local) {
1125		nfc_put_device(dev);
1126		rc = -ENODEV;
1127		goto exit;
1128	}
1129
1130	if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1131		if (dev->dep_link_up) {
1132			rc = -EINPROGRESS;
1133			goto exit;
1134		}
1135
1136		local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1137	}
1138
1139	if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1140		local->rw = rw;
1141
1142	if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1143		local->miux = cpu_to_be16(miux);
1144
1145exit:
1146	device_unlock(&dev->dev);
1147
1148	nfc_put_device(dev);
1149
1150	return rc;
1151}
1152
1153static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1154{
1155	struct nfc_dev *dev;
1156	struct nfc_llcp_local *local;
1157	struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1158	u32 idx;
1159	u8 tid;
1160	char *uri;
1161	int rc = 0, rem;
1162	size_t uri_len, tlvs_len;
1163	struct hlist_head sdreq_list;
1164	struct nfc_llcp_sdp_tlv *sdreq;
1165
1166	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1167	    !info->attrs[NFC_ATTR_LLC_SDP])
1168		return -EINVAL;
1169
1170	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1171
1172	dev = nfc_get_device(idx);
1173	if (!dev)
1174		return -ENODEV;
1175
1176	device_lock(&dev->dev);
1177
1178	if (dev->dep_link_up == false) {
1179		rc = -ENOLINK;
1180		goto exit;
1181	}
1182
1183	local = nfc_llcp_find_local(dev);
1184	if (!local) {
1185		nfc_put_device(dev);
1186		rc = -ENODEV;
1187		goto exit;
1188	}
1189
1190	INIT_HLIST_HEAD(&sdreq_list);
1191
1192	tlvs_len = 0;
1193
1194	nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1195		rc = nla_parse_nested(sdp_attrs, NFC_SDP_ATTR_MAX, attr,
1196				      nfc_sdp_genl_policy, info->extack);
1197
1198		if (rc != 0) {
1199			rc = -EINVAL;
1200			goto exit;
1201		}
1202
1203		if (!sdp_attrs[NFC_SDP_ATTR_URI])
1204			continue;
1205
1206		uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1207		if (uri_len == 0)
1208			continue;
1209
1210		uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1211		if (uri == NULL || *uri == 0)
1212			continue;
1213
1214		tid = local->sdreq_next_tid++;
1215
1216		sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1217		if (sdreq == NULL) {
1218			rc = -ENOMEM;
1219			goto exit;
1220		}
1221
1222		tlvs_len += sdreq->tlv_len;
1223
1224		hlist_add_head(&sdreq->node, &sdreq_list);
1225	}
1226
1227	if (hlist_empty(&sdreq_list)) {
1228		rc = -EINVAL;
1229		goto exit;
1230	}
1231
1232	rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1233exit:
1234	device_unlock(&dev->dev);
1235
1236	nfc_put_device(dev);
1237
1238	return rc;
1239}
1240
1241static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1242{
1243	struct nfc_dev *dev;
1244	int rc;
1245	u32 idx;
1246	char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1247
1248	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1249		return -EINVAL;
1250
1251	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1252
1253	dev = nfc_get_device(idx);
1254	if (!dev)
1255		return -ENODEV;
1256
1257	nla_strlcpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1258		    sizeof(firmware_name));
1259
1260	rc = nfc_fw_download(dev, firmware_name);
1261
1262	nfc_put_device(dev);
1263	return rc;
1264}
1265
1266int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1267			      u32 result)
1268{
1269	struct sk_buff *msg;
1270	void *hdr;
1271
1272	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1273	if (!msg)
1274		return -ENOMEM;
1275
1276	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1277			  NFC_CMD_FW_DOWNLOAD);
1278	if (!hdr)
1279		goto free_msg;
1280
1281	if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1282	    nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1283	    nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1284		goto nla_put_failure;
1285
1286	genlmsg_end(msg, hdr);
1287
1288	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1289
1290	return 0;
1291
1292nla_put_failure:
1293	genlmsg_cancel(msg, hdr);
1294free_msg:
1295	nlmsg_free(msg);
1296	return -EMSGSIZE;
1297}
1298
1299static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1300{
1301	struct nfc_dev *dev;
1302	int rc;
1303	u32 idx, se_idx;
1304
1305	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1306	    !info->attrs[NFC_ATTR_SE_INDEX])
1307		return -EINVAL;
1308
1309	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1310	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1311
1312	dev = nfc_get_device(idx);
1313	if (!dev)
1314		return -ENODEV;
1315
1316	rc = nfc_enable_se(dev, se_idx);
1317
1318	nfc_put_device(dev);
1319	return rc;
1320}
1321
1322static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1323{
1324	struct nfc_dev *dev;
1325	int rc;
1326	u32 idx, se_idx;
1327
1328	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1329	    !info->attrs[NFC_ATTR_SE_INDEX])
1330		return -EINVAL;
1331
1332	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1333	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1334
1335	dev = nfc_get_device(idx);
1336	if (!dev)
1337		return -ENODEV;
1338
1339	rc = nfc_disable_se(dev, se_idx);
1340
1341	nfc_put_device(dev);
1342	return rc;
1343}
1344
1345static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1346				u32 portid, u32 seq,
1347				struct netlink_callback *cb,
1348				int flags)
1349{
1350	void *hdr;
1351	struct nfc_se *se, *n;
1352
1353	list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1354		hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1355				  NFC_CMD_GET_SE);
1356		if (!hdr)
1357			goto nla_put_failure;
1358
1359		if (cb)
1360			genl_dump_check_consistent(cb, hdr);
1361
1362		if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1363		    nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1364		    nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1365			goto nla_put_failure;
1366
1367		genlmsg_end(msg, hdr);
1368	}
1369
1370	return 0;
1371
1372nla_put_failure:
1373	genlmsg_cancel(msg, hdr);
1374	return -EMSGSIZE;
1375}
1376
1377static int nfc_genl_dump_ses(struct sk_buff *skb,
1378				 struct netlink_callback *cb)
1379{
1380	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1381	struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1382	bool first_call = false;
1383
1384	if (!iter) {
1385		first_call = true;
1386		iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1387		if (!iter)
1388			return -ENOMEM;
1389		cb->args[0] = (long) iter;
1390	}
1391
1392	mutex_lock(&nfc_devlist_mutex);
1393
1394	cb->seq = nfc_devlist_generation;
1395
1396	if (first_call) {
1397		nfc_device_iter_init(iter);
1398		dev = nfc_device_iter_next(iter);
1399	}
1400
1401	while (dev) {
1402		int rc;
1403
1404		rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1405					  cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1406		if (rc < 0)
1407			break;
1408
1409		dev = nfc_device_iter_next(iter);
1410	}
1411
1412	mutex_unlock(&nfc_devlist_mutex);
1413
1414	cb->args[1] = (long) dev;
1415
1416	return skb->len;
1417}
1418
1419static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1420{
1421	struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1422
1423	nfc_device_iter_exit(iter);
1424	kfree(iter);
1425
1426	return 0;
1427}
1428
1429static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1430		     u8 *apdu, size_t apdu_length,
1431		     se_io_cb_t cb, void *cb_context)
1432{
1433	struct nfc_se *se;
1434	int rc;
1435
1436	pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1437
1438	device_lock(&dev->dev);
1439
1440	if (!device_is_registered(&dev->dev)) {
1441		rc = -ENODEV;
1442		goto error;
1443	}
1444
1445	if (!dev->dev_up) {
1446		rc = -ENODEV;
1447		goto error;
1448	}
1449
1450	if (!dev->ops->se_io) {
1451		rc = -EOPNOTSUPP;
1452		goto error;
1453	}
1454
1455	se = nfc_find_se(dev, se_idx);
1456	if (!se) {
1457		rc = -EINVAL;
1458		goto error;
1459	}
1460
1461	if (se->state != NFC_SE_ENABLED) {
1462		rc = -ENODEV;
1463		goto error;
1464	}
1465
1466	rc = dev->ops->se_io(dev, se_idx, apdu,
1467			apdu_length, cb, cb_context);
1468
1469error:
1470	device_unlock(&dev->dev);
1471	return rc;
1472}
1473
1474struct se_io_ctx {
1475	u32 dev_idx;
1476	u32 se_idx;
1477};
1478
1479static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1480{
1481	struct se_io_ctx *ctx = context;
1482	struct sk_buff *msg;
1483	void *hdr;
1484
1485	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1486	if (!msg) {
1487		kfree(ctx);
1488		return;
1489	}
1490
1491	hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1492			  NFC_CMD_SE_IO);
1493	if (!hdr)
1494		goto free_msg;
1495
1496	if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1497	    nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1498	    nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1499		goto nla_put_failure;
1500
1501	genlmsg_end(msg, hdr);
1502
1503	genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1504
1505	kfree(ctx);
1506
1507	return;
1508
1509nla_put_failure:
1510	genlmsg_cancel(msg, hdr);
1511free_msg:
1512	nlmsg_free(msg);
1513	kfree(ctx);
1514
1515	return;
1516}
1517
1518static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1519{
1520	struct nfc_dev *dev;
1521	struct se_io_ctx *ctx;
1522	u32 dev_idx, se_idx;
1523	u8 *apdu;
1524	size_t apdu_len;
1525
1526	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1527	    !info->attrs[NFC_ATTR_SE_INDEX] ||
1528	    !info->attrs[NFC_ATTR_SE_APDU])
1529		return -EINVAL;
1530
1531	dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1532	se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1533
1534	dev = nfc_get_device(dev_idx);
1535	if (!dev)
1536		return -ENODEV;
1537
1538	if (!dev->ops || !dev->ops->se_io)
1539		return -ENOTSUPP;
1540
1541	apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1542	if (apdu_len == 0)
1543		return -EINVAL;
1544
1545	apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1546	if (!apdu)
1547		return -EINVAL;
1548
1549	ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1550	if (!ctx)
1551		return -ENOMEM;
1552
1553	ctx->dev_idx = dev_idx;
1554	ctx->se_idx = se_idx;
1555
1556	return nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1557}
1558
1559static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1560			       struct genl_info *info)
1561{
1562	struct nfc_dev *dev;
1563	struct nfc_vendor_cmd *cmd;
1564	u32 dev_idx, vid, subcmd;
1565	u8 *data;
1566	size_t data_len;
1567	int i, err;
1568
1569	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1570	    !info->attrs[NFC_ATTR_VENDOR_ID] ||
1571	    !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1572		return -EINVAL;
1573
1574	dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1575	vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1576	subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1577
1578	dev = nfc_get_device(dev_idx);
1579	if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
1580		return -ENODEV;
1581
1582	if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1583		data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1584		data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1585		if (data_len == 0)
1586			return -EINVAL;
1587	} else {
1588		data = NULL;
1589		data_len = 0;
1590	}
1591
1592	for (i = 0; i < dev->n_vendor_cmds; i++) {
1593		cmd = &dev->vendor_cmds[i];
1594
1595		if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1596			continue;
1597
1598		dev->cur_cmd_info = info;
1599		err = cmd->doit(dev, data, data_len);
1600		dev->cur_cmd_info = NULL;
1601		return err;
1602	}
1603
1604	return -EOPNOTSUPP;
1605}
1606
1607/* message building helper */
1608static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1609				int flags, u8 cmd)
1610{
1611	/* since there is no private header just add the generic one */
1612	return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1613}
1614
1615static struct sk_buff *
1616__nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1617			   u32 portid, u32 seq,
1618			   enum nfc_attrs attr,
1619			   u32 oui, u32 subcmd, gfp_t gfp)
1620{
1621	struct sk_buff *skb;
1622	void *hdr;
1623
1624	skb = nlmsg_new(approxlen + 100, gfp);
1625	if (!skb)
1626		return NULL;
1627
1628	hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1629	if (!hdr) {
1630		kfree_skb(skb);
1631		return NULL;
1632	}
1633
1634	if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1635		goto nla_put_failure;
1636	if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1637		goto nla_put_failure;
1638	if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1639		goto nla_put_failure;
1640
1641	((void **)skb->cb)[0] = dev;
1642	((void **)skb->cb)[1] = hdr;
1643
1644	return skb;
1645
1646nla_put_failure:
1647	kfree_skb(skb);
1648	return NULL;
1649}
1650
1651struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1652						 enum nfc_attrs attr,
1653						 u32 oui, u32 subcmd,
1654						 int approxlen)
1655{
1656	if (WARN_ON(!dev->cur_cmd_info))
1657		return NULL;
1658
1659	return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1660					  dev->cur_cmd_info->snd_portid,
1661					  dev->cur_cmd_info->snd_seq, attr,
1662					  oui, subcmd, GFP_KERNEL);
1663}
1664EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1665
1666int nfc_vendor_cmd_reply(struct sk_buff *skb)
1667{
1668	struct nfc_dev *dev = ((void **)skb->cb)[0];
1669	void *hdr = ((void **)skb->cb)[1];
1670
1671	/* clear CB data for netlink core to own from now on */
1672	memset(skb->cb, 0, sizeof(skb->cb));
1673
1674	if (WARN_ON(!dev->cur_cmd_info)) {
1675		kfree_skb(skb);
1676		return -EINVAL;
1677	}
1678
1679	genlmsg_end(skb, hdr);
1680	return genlmsg_reply(skb, dev->cur_cmd_info);
1681}
1682EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1683
1684static const struct genl_ops nfc_genl_ops[] = {
1685	{
1686		.cmd = NFC_CMD_GET_DEVICE,
1687		.doit = nfc_genl_get_device,
1688		.dumpit = nfc_genl_dump_devices,
1689		.done = nfc_genl_dump_devices_done,
1690		.policy = nfc_genl_policy,
1691	},
1692	{
1693		.cmd = NFC_CMD_DEV_UP,
1694		.doit = nfc_genl_dev_up,
1695		.policy = nfc_genl_policy,
1696	},
1697	{
1698		.cmd = NFC_CMD_DEV_DOWN,
1699		.doit = nfc_genl_dev_down,
1700		.policy = nfc_genl_policy,
1701	},
1702	{
1703		.cmd = NFC_CMD_START_POLL,
1704		.doit = nfc_genl_start_poll,
1705		.policy = nfc_genl_policy,
1706	},
1707	{
1708		.cmd = NFC_CMD_STOP_POLL,
1709		.doit = nfc_genl_stop_poll,
1710		.policy = nfc_genl_policy,
1711	},
1712	{
1713		.cmd = NFC_CMD_DEP_LINK_UP,
1714		.doit = nfc_genl_dep_link_up,
1715		.policy = nfc_genl_policy,
1716	},
1717	{
1718		.cmd = NFC_CMD_DEP_LINK_DOWN,
1719		.doit = nfc_genl_dep_link_down,
1720		.policy = nfc_genl_policy,
1721	},
1722	{
1723		.cmd = NFC_CMD_GET_TARGET,
1724		.dumpit = nfc_genl_dump_targets,
1725		.done = nfc_genl_dump_targets_done,
1726		.policy = nfc_genl_policy,
1727	},
1728	{
1729		.cmd = NFC_CMD_LLC_GET_PARAMS,
1730		.doit = nfc_genl_llc_get_params,
1731		.policy = nfc_genl_policy,
1732	},
1733	{
1734		.cmd = NFC_CMD_LLC_SET_PARAMS,
1735		.doit = nfc_genl_llc_set_params,
1736		.policy = nfc_genl_policy,
1737	},
1738	{
1739		.cmd = NFC_CMD_LLC_SDREQ,
1740		.doit = nfc_genl_llc_sdreq,
1741		.policy = nfc_genl_policy,
1742	},
1743	{
1744		.cmd = NFC_CMD_FW_DOWNLOAD,
1745		.doit = nfc_genl_fw_download,
1746		.policy = nfc_genl_policy,
1747	},
1748	{
1749		.cmd = NFC_CMD_ENABLE_SE,
1750		.doit = nfc_genl_enable_se,
1751		.policy = nfc_genl_policy,
1752	},
1753	{
1754		.cmd = NFC_CMD_DISABLE_SE,
1755		.doit = nfc_genl_disable_se,
1756		.policy = nfc_genl_policy,
1757	},
1758	{
1759		.cmd = NFC_CMD_GET_SE,
1760		.dumpit = nfc_genl_dump_ses,
1761		.done = nfc_genl_dump_ses_done,
1762		.policy = nfc_genl_policy,
1763	},
1764	{
1765		.cmd = NFC_CMD_SE_IO,
1766		.doit = nfc_genl_se_io,
1767		.policy = nfc_genl_policy,
1768	},
1769	{
1770		.cmd = NFC_CMD_ACTIVATE_TARGET,
1771		.doit = nfc_genl_activate_target,
1772		.policy = nfc_genl_policy,
1773	},
1774	{
1775		.cmd = NFC_CMD_VENDOR,
1776		.doit = nfc_genl_vendor_cmd,
1777		.policy = nfc_genl_policy,
1778	},
1779	{
1780		.cmd = NFC_CMD_DEACTIVATE_TARGET,
1781		.doit = nfc_genl_deactivate_target,
1782		.policy = nfc_genl_policy,
1783	},
1784};
1785
1786static struct genl_family nfc_genl_family __ro_after_init = {
1787	.hdrsize = 0,
1788	.name = NFC_GENL_NAME,
1789	.version = NFC_GENL_VERSION,
1790	.maxattr = NFC_ATTR_MAX,
1791	.module = THIS_MODULE,
1792	.ops = nfc_genl_ops,
1793	.n_ops = ARRAY_SIZE(nfc_genl_ops),
1794	.mcgrps = nfc_genl_mcgrps,
1795	.n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1796};
1797
1798
1799struct urelease_work {
1800	struct	work_struct w;
1801	u32	portid;
1802};
1803
1804static void nfc_urelease_event_work(struct work_struct *work)
1805{
1806	struct urelease_work *w = container_of(work, struct urelease_work, w);
1807	struct class_dev_iter iter;
1808	struct nfc_dev *dev;
1809
1810	pr_debug("portid %d\n", w->portid);
 
1811
1812	mutex_lock(&nfc_devlist_mutex);
1813
1814	nfc_device_iter_init(&iter);
1815	dev = nfc_device_iter_next(&iter);
1816
1817	while (dev) {
1818		mutex_lock(&dev->genl_data.genl_data_mutex);
1819
1820		if (dev->genl_data.poll_req_portid == w->portid) {
1821			nfc_stop_poll(dev);
1822			dev->genl_data.poll_req_portid = 0;
1823		}
1824
1825		mutex_unlock(&dev->genl_data.genl_data_mutex);
1826
1827		dev = nfc_device_iter_next(&iter);
1828	}
1829
1830	nfc_device_iter_exit(&iter);
1831
1832	mutex_unlock(&nfc_devlist_mutex);
1833
1834	kfree(w);
1835}
1836
1837static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1838				 unsigned long event, void *ptr)
1839{
1840	struct netlink_notify *n = ptr;
1841	struct urelease_work *w;
1842
1843	if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1844		goto out;
1845
1846	pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1847
1848	w = kmalloc(sizeof(*w), GFP_ATOMIC);
1849	if (w) {
1850		INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
1851		w->portid = n->portid;
1852		schedule_work((struct work_struct *) w);
1853	}
1854
1855out:
1856	return NOTIFY_DONE;
1857}
1858
1859void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1860{
1861	genl_data->poll_req_portid = 0;
1862	mutex_init(&genl_data->genl_data_mutex);
1863}
1864
1865void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1866{
1867	mutex_destroy(&genl_data->genl_data_mutex);
1868}
1869
1870static struct notifier_block nl_notifier = {
1871	.notifier_call  = nfc_genl_rcv_nl_event,
1872};
1873
1874/**
1875 * nfc_genl_init() - Initialize netlink interface
1876 *
1877 * This initialization function registers the nfc netlink family.
1878 */
1879int __init nfc_genl_init(void)
1880{
1881	int rc;
1882
1883	rc = genl_register_family(&nfc_genl_family);
 
1884	if (rc)
1885		return rc;
1886
 
 
1887	netlink_register_notifier(&nl_notifier);
1888
1889	return 0;
1890}
1891
1892/**
1893 * nfc_genl_exit() - Deinitialize netlink interface
1894 *
1895 * This exit function unregisters the nfc netlink family.
1896 */
1897void nfc_genl_exit(void)
1898{
1899	netlink_unregister_notifier(&nl_notifier);
1900	genl_unregister_family(&nfc_genl_family);
1901}