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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}
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
25static const struct genl_multicast_group nfc_genl_mcgrps[] = {
26 { .name = NFC_GENL_MCAST_EVENT_NAME, },
27};
28
29static struct genl_family nfc_genl_family;
30static 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
55static 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
61static 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 if (target->ats_len > 0 &&
100 nla_put(msg, NFC_ATTR_TARGET_ATS, target->ats_len,
101 target->ats))
102 goto nla_put_failure;
103
104 genlmsg_end(msg, hdr);
105 return 0;
106
107nla_put_failure:
108 genlmsg_cancel(msg, hdr);
109 return -EMSGSIZE;
110}
111
112static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
113{
114 const struct genl_dumpit_info *info = genl_dumpit_info(cb);
115 struct nfc_dev *dev;
116 u32 idx;
117
118 if (!info->info.attrs[NFC_ATTR_DEVICE_INDEX])
119 return ERR_PTR(-EINVAL);
120
121 idx = nla_get_u32(info->info.attrs[NFC_ATTR_DEVICE_INDEX]);
122
123 dev = nfc_get_device(idx);
124 if (!dev)
125 return ERR_PTR(-ENODEV);
126
127 return dev;
128}
129
130static int nfc_genl_dump_targets(struct sk_buff *skb,
131 struct netlink_callback *cb)
132{
133 int i = cb->args[0];
134 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
135 int rc;
136
137 if (!dev) {
138 dev = __get_device_from_cb(cb);
139 if (IS_ERR(dev))
140 return PTR_ERR(dev);
141
142 cb->args[1] = (long) dev;
143 }
144
145 device_lock(&dev->dev);
146
147 cb->seq = dev->targets_generation;
148
149 while (i < dev->n_targets) {
150 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
151 NLM_F_MULTI);
152 if (rc < 0)
153 break;
154
155 i++;
156 }
157
158 device_unlock(&dev->dev);
159
160 cb->args[0] = i;
161
162 return skb->len;
163}
164
165static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
166{
167 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
168
169 if (dev)
170 nfc_put_device(dev);
171
172 return 0;
173}
174
175int nfc_genl_targets_found(struct nfc_dev *dev)
176{
177 struct sk_buff *msg;
178 void *hdr;
179
180 dev->genl_data.poll_req_portid = 0;
181
182 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
183 if (!msg)
184 return -ENOMEM;
185
186 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
187 NFC_EVENT_TARGETS_FOUND);
188 if (!hdr)
189 goto free_msg;
190
191 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
192 goto nla_put_failure;
193
194 genlmsg_end(msg, hdr);
195
196 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
197
198nla_put_failure:
199free_msg:
200 nlmsg_free(msg);
201 return -EMSGSIZE;
202}
203
204int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
205{
206 struct sk_buff *msg;
207 void *hdr;
208
209 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
210 if (!msg)
211 return -ENOMEM;
212
213 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
214 NFC_EVENT_TARGET_LOST);
215 if (!hdr)
216 goto free_msg;
217
218 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
219 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
220 goto nla_put_failure;
221
222 genlmsg_end(msg, hdr);
223
224 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
225
226 return 0;
227
228nla_put_failure:
229free_msg:
230 nlmsg_free(msg);
231 return -EMSGSIZE;
232}
233
234int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
235{
236 struct sk_buff *msg;
237 void *hdr;
238
239 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
240 if (!msg)
241 return -ENOMEM;
242
243 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
244 NFC_EVENT_TM_ACTIVATED);
245 if (!hdr)
246 goto free_msg;
247
248 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
249 goto nla_put_failure;
250 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
251 goto nla_put_failure;
252
253 genlmsg_end(msg, hdr);
254
255 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
256
257 return 0;
258
259nla_put_failure:
260free_msg:
261 nlmsg_free(msg);
262 return -EMSGSIZE;
263}
264
265int nfc_genl_tm_deactivated(struct nfc_dev *dev)
266{
267 struct sk_buff *msg;
268 void *hdr;
269
270 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
271 if (!msg)
272 return -ENOMEM;
273
274 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
275 NFC_EVENT_TM_DEACTIVATED);
276 if (!hdr)
277 goto free_msg;
278
279 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
280 goto nla_put_failure;
281
282 genlmsg_end(msg, hdr);
283
284 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
285
286 return 0;
287
288nla_put_failure:
289free_msg:
290 nlmsg_free(msg);
291 return -EMSGSIZE;
292}
293
294static int nfc_genl_setup_device_added(struct nfc_dev *dev, struct sk_buff *msg)
295{
296 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
297 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
298 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
299 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
300 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
301 return -1;
302 return 0;
303}
304
305int nfc_genl_device_added(struct nfc_dev *dev)
306{
307 struct sk_buff *msg;
308 void *hdr;
309
310 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
311 if (!msg)
312 return -ENOMEM;
313
314 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
315 NFC_EVENT_DEVICE_ADDED);
316 if (!hdr)
317 goto free_msg;
318
319 if (nfc_genl_setup_device_added(dev, msg))
320 goto nla_put_failure;
321
322 genlmsg_end(msg, hdr);
323
324 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
325
326 return 0;
327
328nla_put_failure:
329free_msg:
330 nlmsg_free(msg);
331 return -EMSGSIZE;
332}
333
334int nfc_genl_device_removed(struct nfc_dev *dev)
335{
336 struct sk_buff *msg;
337 void *hdr;
338
339 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
340 if (!msg)
341 return -ENOMEM;
342
343 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
344 NFC_EVENT_DEVICE_REMOVED);
345 if (!hdr)
346 goto free_msg;
347
348 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
349 goto nla_put_failure;
350
351 genlmsg_end(msg, hdr);
352
353 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
354
355 return 0;
356
357nla_put_failure:
358free_msg:
359 nlmsg_free(msg);
360 return -EMSGSIZE;
361}
362
363int nfc_genl_llc_send_sdres(struct nfc_dev *dev, struct hlist_head *sdres_list)
364{
365 struct sk_buff *msg;
366 struct nlattr *sdp_attr, *uri_attr;
367 struct nfc_llcp_sdp_tlv *sdres;
368 struct hlist_node *n;
369 void *hdr;
370 int rc = -EMSGSIZE;
371 int i;
372
373 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
374 if (!msg)
375 return -ENOMEM;
376
377 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
378 NFC_EVENT_LLC_SDRES);
379 if (!hdr)
380 goto free_msg;
381
382 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
383 goto nla_put_failure;
384
385 sdp_attr = nla_nest_start_noflag(msg, NFC_ATTR_LLC_SDP);
386 if (sdp_attr == NULL) {
387 rc = -ENOMEM;
388 goto nla_put_failure;
389 }
390
391 i = 1;
392 hlist_for_each_entry_safe(sdres, n, sdres_list, node) {
393 pr_debug("uri: %s, sap: %d\n", sdres->uri, sdres->sap);
394
395 uri_attr = nla_nest_start_noflag(msg, i++);
396 if (uri_attr == NULL) {
397 rc = -ENOMEM;
398 goto nla_put_failure;
399 }
400
401 if (nla_put_u8(msg, NFC_SDP_ATTR_SAP, sdres->sap))
402 goto nla_put_failure;
403
404 if (nla_put_string(msg, NFC_SDP_ATTR_URI, sdres->uri))
405 goto nla_put_failure;
406
407 nla_nest_end(msg, uri_attr);
408
409 hlist_del(&sdres->node);
410
411 nfc_llcp_free_sdp_tlv(sdres);
412 }
413
414 nla_nest_end(msg, sdp_attr);
415
416 genlmsg_end(msg, hdr);
417
418 return genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
419
420nla_put_failure:
421free_msg:
422 nlmsg_free(msg);
423
424 nfc_llcp_free_sdp_tlv_list(sdres_list);
425
426 return rc;
427}
428
429int nfc_genl_se_added(struct nfc_dev *dev, u32 se_idx, u16 type)
430{
431 struct sk_buff *msg;
432 void *hdr;
433
434 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
435 if (!msg)
436 return -ENOMEM;
437
438 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
439 NFC_EVENT_SE_ADDED);
440 if (!hdr)
441 goto free_msg;
442
443 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
444 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
445 nla_put_u8(msg, NFC_ATTR_SE_TYPE, type))
446 goto nla_put_failure;
447
448 genlmsg_end(msg, hdr);
449
450 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
451
452 return 0;
453
454nla_put_failure:
455free_msg:
456 nlmsg_free(msg);
457 return -EMSGSIZE;
458}
459
460int nfc_genl_se_removed(struct nfc_dev *dev, u32 se_idx)
461{
462 struct sk_buff *msg;
463 void *hdr;
464
465 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
466 if (!msg)
467 return -ENOMEM;
468
469 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
470 NFC_EVENT_SE_REMOVED);
471 if (!hdr)
472 goto free_msg;
473
474 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
475 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx))
476 goto nla_put_failure;
477
478 genlmsg_end(msg, hdr);
479
480 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
481
482 return 0;
483
484nla_put_failure:
485free_msg:
486 nlmsg_free(msg);
487 return -EMSGSIZE;
488}
489
490int nfc_genl_se_transaction(struct nfc_dev *dev, u8 se_idx,
491 struct nfc_evt_transaction *evt_transaction)
492{
493 struct nfc_se *se;
494 struct sk_buff *msg;
495 void *hdr;
496
497 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
498 if (!msg)
499 return -ENOMEM;
500
501 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
502 NFC_EVENT_SE_TRANSACTION);
503 if (!hdr)
504 goto free_msg;
505
506 se = nfc_find_se(dev, se_idx);
507 if (!se)
508 goto free_msg;
509
510 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
511 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
512 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type) ||
513 nla_put(msg, NFC_ATTR_SE_AID, evt_transaction->aid_len,
514 evt_transaction->aid) ||
515 nla_put(msg, NFC_ATTR_SE_PARAMS, evt_transaction->params_len,
516 evt_transaction->params))
517 goto nla_put_failure;
518
519 /* evt_transaction is no more used */
520 devm_kfree(&dev->dev, evt_transaction);
521
522 genlmsg_end(msg, hdr);
523
524 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
525
526 return 0;
527
528nla_put_failure:
529free_msg:
530 /* evt_transaction is no more used */
531 devm_kfree(&dev->dev, evt_transaction);
532 nlmsg_free(msg);
533 return -EMSGSIZE;
534}
535
536int nfc_genl_se_connectivity(struct nfc_dev *dev, u8 se_idx)
537{
538 const struct nfc_se *se;
539 struct sk_buff *msg;
540 void *hdr;
541
542 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
543 if (!msg)
544 return -ENOMEM;
545
546 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
547 NFC_EVENT_SE_CONNECTIVITY);
548 if (!hdr)
549 goto free_msg;
550
551 se = nfc_find_se(dev, se_idx);
552 if (!se)
553 goto free_msg;
554
555 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
556 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se_idx) ||
557 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
558 goto nla_put_failure;
559
560 genlmsg_end(msg, hdr);
561
562 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
563
564 return 0;
565
566nla_put_failure:
567free_msg:
568 nlmsg_free(msg);
569 return -EMSGSIZE;
570}
571
572static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
573 u32 portid, u32 seq,
574 struct netlink_callback *cb,
575 int flags)
576{
577 void *hdr;
578
579 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
580 NFC_CMD_GET_DEVICE);
581 if (!hdr)
582 return -EMSGSIZE;
583
584 if (cb)
585 genl_dump_check_consistent(cb, hdr);
586
587 if (nfc_genl_setup_device_added(dev, msg))
588 goto nla_put_failure;
589
590 genlmsg_end(msg, hdr);
591 return 0;
592
593nla_put_failure:
594 genlmsg_cancel(msg, hdr);
595 return -EMSGSIZE;
596}
597
598static int nfc_genl_dump_devices(struct sk_buff *skb,
599 struct netlink_callback *cb)
600{
601 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
602 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
603 bool first_call = false;
604
605 if (!iter) {
606 first_call = true;
607 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
608 if (!iter)
609 return -ENOMEM;
610 cb->args[0] = (long) iter;
611 }
612
613 mutex_lock(&nfc_devlist_mutex);
614
615 cb->seq = nfc_devlist_generation;
616
617 if (first_call) {
618 nfc_device_iter_init(iter);
619 dev = nfc_device_iter_next(iter);
620 }
621
622 while (dev) {
623 int rc;
624
625 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
626 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
627 if (rc < 0)
628 break;
629
630 dev = nfc_device_iter_next(iter);
631 }
632
633 mutex_unlock(&nfc_devlist_mutex);
634
635 cb->args[1] = (long) dev;
636
637 return skb->len;
638}
639
640static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
641{
642 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
643
644 if (iter) {
645 nfc_device_iter_exit(iter);
646 kfree(iter);
647 }
648
649 return 0;
650}
651
652int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
653 u8 comm_mode, u8 rf_mode)
654{
655 struct sk_buff *msg;
656 void *hdr;
657
658 pr_debug("DEP link is up\n");
659
660 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
661 if (!msg)
662 return -ENOMEM;
663
664 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
665 if (!hdr)
666 goto free_msg;
667
668 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
669 goto nla_put_failure;
670 if (rf_mode == NFC_RF_INITIATOR &&
671 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
672 goto nla_put_failure;
673 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
674 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
675 goto nla_put_failure;
676
677 genlmsg_end(msg, hdr);
678
679 dev->dep_link_up = true;
680
681 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
682
683 return 0;
684
685nla_put_failure:
686free_msg:
687 nlmsg_free(msg);
688 return -EMSGSIZE;
689}
690
691int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
692{
693 struct sk_buff *msg;
694 void *hdr;
695
696 pr_debug("DEP link is down\n");
697
698 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
699 if (!msg)
700 return -ENOMEM;
701
702 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
703 NFC_CMD_DEP_LINK_DOWN);
704 if (!hdr)
705 goto free_msg;
706
707 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
708 goto nla_put_failure;
709
710 genlmsg_end(msg, hdr);
711
712 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
713
714 return 0;
715
716nla_put_failure:
717free_msg:
718 nlmsg_free(msg);
719 return -EMSGSIZE;
720}
721
722static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
723{
724 struct sk_buff *msg;
725 struct nfc_dev *dev;
726 u32 idx;
727 int rc = -ENOBUFS;
728
729 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
730 return -EINVAL;
731
732 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
733
734 dev = nfc_get_device(idx);
735 if (!dev)
736 return -ENODEV;
737
738 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
739 if (!msg) {
740 rc = -ENOMEM;
741 goto out_putdev;
742 }
743
744 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
745 NULL, 0);
746 if (rc < 0)
747 goto out_free;
748
749 nfc_put_device(dev);
750
751 return genlmsg_reply(msg, info);
752
753out_free:
754 nlmsg_free(msg);
755out_putdev:
756 nfc_put_device(dev);
757 return rc;
758}
759
760static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
761{
762 struct nfc_dev *dev;
763 int rc;
764 u32 idx;
765
766 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
767 return -EINVAL;
768
769 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
770
771 dev = nfc_get_device(idx);
772 if (!dev)
773 return -ENODEV;
774
775 rc = nfc_dev_up(dev);
776
777 nfc_put_device(dev);
778 return rc;
779}
780
781static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
782{
783 struct nfc_dev *dev;
784 int rc;
785 u32 idx;
786
787 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
788 return -EINVAL;
789
790 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
791
792 dev = nfc_get_device(idx);
793 if (!dev)
794 return -ENODEV;
795
796 rc = nfc_dev_down(dev);
797
798 nfc_put_device(dev);
799 return rc;
800}
801
802static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
803{
804 struct nfc_dev *dev;
805 int rc;
806 u32 idx;
807 u32 im_protocols = 0, tm_protocols = 0;
808
809 pr_debug("Poll start\n");
810
811 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
812 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
813 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
814 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
815 return -EINVAL;
816
817 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
818
819 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
820 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
821
822 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
823 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
824 else if (info->attrs[NFC_ATTR_PROTOCOLS])
825 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
826
827 dev = nfc_get_device(idx);
828 if (!dev)
829 return -ENODEV;
830
831 mutex_lock(&dev->genl_data.genl_data_mutex);
832
833 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
834 if (!rc)
835 dev->genl_data.poll_req_portid = info->snd_portid;
836
837 mutex_unlock(&dev->genl_data.genl_data_mutex);
838
839 nfc_put_device(dev);
840 return rc;
841}
842
843static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
844{
845 struct nfc_dev *dev;
846 int rc;
847 u32 idx;
848
849 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
850 return -EINVAL;
851
852 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
853
854 dev = nfc_get_device(idx);
855 if (!dev)
856 return -ENODEV;
857
858 device_lock(&dev->dev);
859
860 if (!dev->polling) {
861 device_unlock(&dev->dev);
862 nfc_put_device(dev);
863 return -EINVAL;
864 }
865
866 device_unlock(&dev->dev);
867
868 mutex_lock(&dev->genl_data.genl_data_mutex);
869
870 if (dev->genl_data.poll_req_portid != info->snd_portid) {
871 rc = -EBUSY;
872 goto out;
873 }
874
875 rc = nfc_stop_poll(dev);
876 dev->genl_data.poll_req_portid = 0;
877
878out:
879 mutex_unlock(&dev->genl_data.genl_data_mutex);
880 nfc_put_device(dev);
881 return rc;
882}
883
884static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
885{
886 struct nfc_dev *dev;
887 u32 device_idx, target_idx, protocol;
888 int rc;
889
890 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
891 !info->attrs[NFC_ATTR_TARGET_INDEX] ||
892 !info->attrs[NFC_ATTR_PROTOCOLS])
893 return -EINVAL;
894
895 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
896
897 dev = nfc_get_device(device_idx);
898 if (!dev)
899 return -ENODEV;
900
901 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
902 protocol = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
903
904 nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
905 rc = nfc_activate_target(dev, target_idx, protocol);
906
907 nfc_put_device(dev);
908 return rc;
909}
910
911static int nfc_genl_deactivate_target(struct sk_buff *skb,
912 struct genl_info *info)
913{
914 struct nfc_dev *dev;
915 u32 device_idx, target_idx;
916 int rc;
917
918 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
919 !info->attrs[NFC_ATTR_TARGET_INDEX])
920 return -EINVAL;
921
922 device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
923
924 dev = nfc_get_device(device_idx);
925 if (!dev)
926 return -ENODEV;
927
928 target_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
929
930 rc = nfc_deactivate_target(dev, target_idx, NFC_TARGET_MODE_SLEEP);
931
932 nfc_put_device(dev);
933 return rc;
934}
935
936static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
937{
938 struct nfc_dev *dev;
939 int rc, tgt_idx;
940 u32 idx;
941 u8 comm;
942
943 pr_debug("DEP link up\n");
944
945 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
946 !info->attrs[NFC_ATTR_COMM_MODE])
947 return -EINVAL;
948
949 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
950 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
951 tgt_idx = NFC_TARGET_IDX_ANY;
952 else
953 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
954
955 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
956
957 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
958 return -EINVAL;
959
960 dev = nfc_get_device(idx);
961 if (!dev)
962 return -ENODEV;
963
964 rc = nfc_dep_link_up(dev, tgt_idx, comm);
965
966 nfc_put_device(dev);
967
968 return rc;
969}
970
971static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
972{
973 struct nfc_dev *dev;
974 int rc;
975 u32 idx;
976
977 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
978 return -EINVAL;
979
980 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
981
982 dev = nfc_get_device(idx);
983 if (!dev)
984 return -ENODEV;
985
986 rc = nfc_dep_link_down(dev);
987
988 nfc_put_device(dev);
989 return rc;
990}
991
992static int nfc_genl_send_params(struct sk_buff *msg,
993 struct nfc_llcp_local *local,
994 u32 portid, u32 seq)
995{
996 void *hdr;
997
998 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, 0,
999 NFC_CMD_LLC_GET_PARAMS);
1000 if (!hdr)
1001 return -EMSGSIZE;
1002
1003 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, local->dev->idx) ||
1004 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_LTO, local->lto) ||
1005 nla_put_u8(msg, NFC_ATTR_LLC_PARAM_RW, local->rw) ||
1006 nla_put_u16(msg, NFC_ATTR_LLC_PARAM_MIUX, be16_to_cpu(local->miux)))
1007 goto nla_put_failure;
1008
1009 genlmsg_end(msg, hdr);
1010 return 0;
1011
1012nla_put_failure:
1013 genlmsg_cancel(msg, hdr);
1014 return -EMSGSIZE;
1015}
1016
1017static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
1018{
1019 struct nfc_dev *dev;
1020 struct nfc_llcp_local *local;
1021 int rc = 0;
1022 struct sk_buff *msg = NULL;
1023 u32 idx;
1024
1025 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
1026 return -EINVAL;
1027
1028 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1029
1030 dev = nfc_get_device(idx);
1031 if (!dev)
1032 return -ENODEV;
1033
1034 device_lock(&dev->dev);
1035
1036 local = nfc_llcp_find_local(dev);
1037 if (!local) {
1038 rc = -ENODEV;
1039 goto exit;
1040 }
1041
1042 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1043 if (!msg) {
1044 rc = -ENOMEM;
1045 goto put_local;
1046 }
1047
1048 rc = nfc_genl_send_params(msg, local, info->snd_portid, info->snd_seq);
1049
1050put_local:
1051 nfc_llcp_local_put(local);
1052
1053exit:
1054 device_unlock(&dev->dev);
1055
1056 nfc_put_device(dev);
1057
1058 if (rc < 0) {
1059 if (msg)
1060 nlmsg_free(msg);
1061
1062 return rc;
1063 }
1064
1065 return genlmsg_reply(msg, info);
1066}
1067
1068static int nfc_genl_llc_set_params(struct sk_buff *skb, struct genl_info *info)
1069{
1070 struct nfc_dev *dev;
1071 struct nfc_llcp_local *local;
1072 u8 rw = 0;
1073 u16 miux = 0;
1074 u32 idx;
1075 int rc = 0;
1076
1077 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1078 (!info->attrs[NFC_ATTR_LLC_PARAM_LTO] &&
1079 !info->attrs[NFC_ATTR_LLC_PARAM_RW] &&
1080 !info->attrs[NFC_ATTR_LLC_PARAM_MIUX]))
1081 return -EINVAL;
1082
1083 if (info->attrs[NFC_ATTR_LLC_PARAM_RW]) {
1084 rw = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_RW]);
1085
1086 if (rw > LLCP_MAX_RW)
1087 return -EINVAL;
1088 }
1089
1090 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX]) {
1091 miux = nla_get_u16(info->attrs[NFC_ATTR_LLC_PARAM_MIUX]);
1092
1093 if (miux > LLCP_MAX_MIUX)
1094 return -EINVAL;
1095 }
1096
1097 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1098
1099 dev = nfc_get_device(idx);
1100 if (!dev)
1101 return -ENODEV;
1102
1103 device_lock(&dev->dev);
1104
1105 local = nfc_llcp_find_local(dev);
1106 if (!local) {
1107 rc = -ENODEV;
1108 goto exit;
1109 }
1110
1111 if (info->attrs[NFC_ATTR_LLC_PARAM_LTO]) {
1112 if (dev->dep_link_up) {
1113 rc = -EINPROGRESS;
1114 goto put_local;
1115 }
1116
1117 local->lto = nla_get_u8(info->attrs[NFC_ATTR_LLC_PARAM_LTO]);
1118 }
1119
1120 if (info->attrs[NFC_ATTR_LLC_PARAM_RW])
1121 local->rw = rw;
1122
1123 if (info->attrs[NFC_ATTR_LLC_PARAM_MIUX])
1124 local->miux = cpu_to_be16(miux);
1125
1126put_local:
1127 nfc_llcp_local_put(local);
1128
1129exit:
1130 device_unlock(&dev->dev);
1131
1132 nfc_put_device(dev);
1133
1134 return rc;
1135}
1136
1137static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
1138{
1139 struct nfc_dev *dev;
1140 struct nfc_llcp_local *local;
1141 struct nlattr *attr, *sdp_attrs[NFC_SDP_ATTR_MAX+1];
1142 u32 idx;
1143 u8 tid;
1144 char *uri;
1145 int rc = 0, rem;
1146 size_t uri_len, tlvs_len;
1147 struct hlist_head sdreq_list;
1148 struct nfc_llcp_sdp_tlv *sdreq;
1149
1150 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1151 !info->attrs[NFC_ATTR_LLC_SDP])
1152 return -EINVAL;
1153
1154 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1155
1156 dev = nfc_get_device(idx);
1157 if (!dev)
1158 return -ENODEV;
1159
1160 device_lock(&dev->dev);
1161
1162 if (dev->dep_link_up == false) {
1163 rc = -ENOLINK;
1164 goto exit;
1165 }
1166
1167 local = nfc_llcp_find_local(dev);
1168 if (!local) {
1169 rc = -ENODEV;
1170 goto exit;
1171 }
1172
1173 INIT_HLIST_HEAD(&sdreq_list);
1174
1175 tlvs_len = 0;
1176
1177 nla_for_each_nested(attr, info->attrs[NFC_ATTR_LLC_SDP], rem) {
1178 rc = nla_parse_nested_deprecated(sdp_attrs, NFC_SDP_ATTR_MAX,
1179 attr, nfc_sdp_genl_policy,
1180 info->extack);
1181
1182 if (rc != 0) {
1183 rc = -EINVAL;
1184 goto put_local;
1185 }
1186
1187 if (!sdp_attrs[NFC_SDP_ATTR_URI])
1188 continue;
1189
1190 uri_len = nla_len(sdp_attrs[NFC_SDP_ATTR_URI]);
1191 if (uri_len == 0)
1192 continue;
1193
1194 uri = nla_data(sdp_attrs[NFC_SDP_ATTR_URI]);
1195 if (uri == NULL || *uri == 0)
1196 continue;
1197
1198 tid = local->sdreq_next_tid++;
1199
1200 sdreq = nfc_llcp_build_sdreq_tlv(tid, uri, uri_len);
1201 if (sdreq == NULL) {
1202 rc = -ENOMEM;
1203 goto put_local;
1204 }
1205
1206 tlvs_len += sdreq->tlv_len;
1207
1208 hlist_add_head(&sdreq->node, &sdreq_list);
1209 }
1210
1211 if (hlist_empty(&sdreq_list)) {
1212 rc = -EINVAL;
1213 goto put_local;
1214 }
1215
1216 rc = nfc_llcp_send_snl_sdreq(local, &sdreq_list, tlvs_len);
1217
1218put_local:
1219 nfc_llcp_local_put(local);
1220
1221exit:
1222 device_unlock(&dev->dev);
1223
1224 nfc_put_device(dev);
1225
1226 return rc;
1227}
1228
1229static int nfc_genl_fw_download(struct sk_buff *skb, struct genl_info *info)
1230{
1231 struct nfc_dev *dev;
1232 int rc;
1233 u32 idx;
1234 char firmware_name[NFC_FIRMWARE_NAME_MAXSIZE + 1];
1235
1236 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] || !info->attrs[NFC_ATTR_FIRMWARE_NAME])
1237 return -EINVAL;
1238
1239 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1240
1241 dev = nfc_get_device(idx);
1242 if (!dev)
1243 return -ENODEV;
1244
1245 nla_strscpy(firmware_name, info->attrs[NFC_ATTR_FIRMWARE_NAME],
1246 sizeof(firmware_name));
1247
1248 rc = nfc_fw_download(dev, firmware_name);
1249
1250 nfc_put_device(dev);
1251 return rc;
1252}
1253
1254int nfc_genl_fw_download_done(struct nfc_dev *dev, const char *firmware_name,
1255 u32 result)
1256{
1257 struct sk_buff *msg;
1258 void *hdr;
1259
1260 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1261 if (!msg)
1262 return -ENOMEM;
1263
1264 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1265 NFC_CMD_FW_DOWNLOAD);
1266 if (!hdr)
1267 goto free_msg;
1268
1269 if (nla_put_string(msg, NFC_ATTR_FIRMWARE_NAME, firmware_name) ||
1270 nla_put_u32(msg, NFC_ATTR_FIRMWARE_DOWNLOAD_STATUS, result) ||
1271 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
1272 goto nla_put_failure;
1273
1274 genlmsg_end(msg, hdr);
1275
1276 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_ATOMIC);
1277
1278 return 0;
1279
1280nla_put_failure:
1281free_msg:
1282 nlmsg_free(msg);
1283 return -EMSGSIZE;
1284}
1285
1286static int nfc_genl_enable_se(struct sk_buff *skb, struct genl_info *info)
1287{
1288 struct nfc_dev *dev;
1289 int rc;
1290 u32 idx, se_idx;
1291
1292 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1293 !info->attrs[NFC_ATTR_SE_INDEX])
1294 return -EINVAL;
1295
1296 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1297 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1298
1299 dev = nfc_get_device(idx);
1300 if (!dev)
1301 return -ENODEV;
1302
1303 rc = nfc_enable_se(dev, se_idx);
1304
1305 nfc_put_device(dev);
1306 return rc;
1307}
1308
1309static int nfc_genl_disable_se(struct sk_buff *skb, struct genl_info *info)
1310{
1311 struct nfc_dev *dev;
1312 int rc;
1313 u32 idx, se_idx;
1314
1315 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1316 !info->attrs[NFC_ATTR_SE_INDEX])
1317 return -EINVAL;
1318
1319 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1320 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1321
1322 dev = nfc_get_device(idx);
1323 if (!dev)
1324 return -ENODEV;
1325
1326 rc = nfc_disable_se(dev, se_idx);
1327
1328 nfc_put_device(dev);
1329 return rc;
1330}
1331
1332static int nfc_genl_send_se(struct sk_buff *msg, struct nfc_dev *dev,
1333 u32 portid, u32 seq,
1334 struct netlink_callback *cb,
1335 int flags)
1336{
1337 void *hdr;
1338 struct nfc_se *se, *n;
1339
1340 list_for_each_entry_safe(se, n, &dev->secure_elements, list) {
1341 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
1342 NFC_CMD_GET_SE);
1343 if (!hdr)
1344 goto nla_put_failure;
1345
1346 if (cb)
1347 genl_dump_check_consistent(cb, hdr);
1348
1349 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
1350 nla_put_u32(msg, NFC_ATTR_SE_INDEX, se->idx) ||
1351 nla_put_u8(msg, NFC_ATTR_SE_TYPE, se->type))
1352 goto nla_put_failure;
1353
1354 genlmsg_end(msg, hdr);
1355 }
1356
1357 return 0;
1358
1359nla_put_failure:
1360 genlmsg_cancel(msg, hdr);
1361 return -EMSGSIZE;
1362}
1363
1364static int nfc_genl_dump_ses(struct sk_buff *skb,
1365 struct netlink_callback *cb)
1366{
1367 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1368 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
1369 bool first_call = false;
1370
1371 if (!iter) {
1372 first_call = true;
1373 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
1374 if (!iter)
1375 return -ENOMEM;
1376 cb->args[0] = (long) iter;
1377 }
1378
1379 mutex_lock(&nfc_devlist_mutex);
1380
1381 cb->seq = nfc_devlist_generation;
1382
1383 if (first_call) {
1384 nfc_device_iter_init(iter);
1385 dev = nfc_device_iter_next(iter);
1386 }
1387
1388 while (dev) {
1389 int rc;
1390
1391 rc = nfc_genl_send_se(skb, dev, NETLINK_CB(cb->skb).portid,
1392 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
1393 if (rc < 0)
1394 break;
1395
1396 dev = nfc_device_iter_next(iter);
1397 }
1398
1399 mutex_unlock(&nfc_devlist_mutex);
1400
1401 cb->args[1] = (long) dev;
1402
1403 return skb->len;
1404}
1405
1406static int nfc_genl_dump_ses_done(struct netlink_callback *cb)
1407{
1408 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
1409
1410 if (iter) {
1411 nfc_device_iter_exit(iter);
1412 kfree(iter);
1413 }
1414
1415 return 0;
1416}
1417
1418static int nfc_se_io(struct nfc_dev *dev, u32 se_idx,
1419 u8 *apdu, size_t apdu_length,
1420 se_io_cb_t cb, void *cb_context)
1421{
1422 struct nfc_se *se;
1423 int rc;
1424
1425 pr_debug("%s se index %d\n", dev_name(&dev->dev), se_idx);
1426
1427 device_lock(&dev->dev);
1428
1429 if (!device_is_registered(&dev->dev)) {
1430 rc = -ENODEV;
1431 goto error;
1432 }
1433
1434 if (!dev->dev_up) {
1435 rc = -ENODEV;
1436 goto error;
1437 }
1438
1439 if (!dev->ops->se_io) {
1440 rc = -EOPNOTSUPP;
1441 goto error;
1442 }
1443
1444 se = nfc_find_se(dev, se_idx);
1445 if (!se) {
1446 rc = -EINVAL;
1447 goto error;
1448 }
1449
1450 if (se->state != NFC_SE_ENABLED) {
1451 rc = -ENODEV;
1452 goto error;
1453 }
1454
1455 rc = dev->ops->se_io(dev, se_idx, apdu,
1456 apdu_length, cb, cb_context);
1457
1458 device_unlock(&dev->dev);
1459 return rc;
1460
1461error:
1462 device_unlock(&dev->dev);
1463 kfree(cb_context);
1464 return rc;
1465}
1466
1467struct se_io_ctx {
1468 u32 dev_idx;
1469 u32 se_idx;
1470};
1471
1472static void se_io_cb(void *context, u8 *apdu, size_t apdu_len, int err)
1473{
1474 struct se_io_ctx *ctx = context;
1475 struct sk_buff *msg;
1476 void *hdr;
1477
1478 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1479 if (!msg) {
1480 kfree(ctx);
1481 return;
1482 }
1483
1484 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
1485 NFC_CMD_SE_IO);
1486 if (!hdr)
1487 goto free_msg;
1488
1489 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, ctx->dev_idx) ||
1490 nla_put_u32(msg, NFC_ATTR_SE_INDEX, ctx->se_idx) ||
1491 nla_put(msg, NFC_ATTR_SE_APDU, apdu_len, apdu))
1492 goto nla_put_failure;
1493
1494 genlmsg_end(msg, hdr);
1495
1496 genlmsg_multicast(&nfc_genl_family, msg, 0, 0, GFP_KERNEL);
1497
1498 kfree(ctx);
1499
1500 return;
1501
1502nla_put_failure:
1503free_msg:
1504 nlmsg_free(msg);
1505 kfree(ctx);
1506
1507 return;
1508}
1509
1510static int nfc_genl_se_io(struct sk_buff *skb, struct genl_info *info)
1511{
1512 struct nfc_dev *dev;
1513 struct se_io_ctx *ctx;
1514 u32 dev_idx, se_idx;
1515 u8 *apdu;
1516 size_t apdu_len;
1517 int rc;
1518
1519 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1520 !info->attrs[NFC_ATTR_SE_INDEX] ||
1521 !info->attrs[NFC_ATTR_SE_APDU])
1522 return -EINVAL;
1523
1524 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1525 se_idx = nla_get_u32(info->attrs[NFC_ATTR_SE_INDEX]);
1526
1527 dev = nfc_get_device(dev_idx);
1528 if (!dev)
1529 return -ENODEV;
1530
1531 if (!dev->ops || !dev->ops->se_io) {
1532 rc = -EOPNOTSUPP;
1533 goto put_dev;
1534 }
1535
1536 apdu_len = nla_len(info->attrs[NFC_ATTR_SE_APDU]);
1537 if (apdu_len == 0) {
1538 rc = -EINVAL;
1539 goto put_dev;
1540 }
1541
1542 apdu = nla_data(info->attrs[NFC_ATTR_SE_APDU]);
1543 if (!apdu) {
1544 rc = -EINVAL;
1545 goto put_dev;
1546 }
1547
1548 ctx = kzalloc(sizeof(struct se_io_ctx), GFP_KERNEL);
1549 if (!ctx) {
1550 rc = -ENOMEM;
1551 goto put_dev;
1552 }
1553
1554 ctx->dev_idx = dev_idx;
1555 ctx->se_idx = se_idx;
1556
1557 rc = nfc_se_io(dev, se_idx, apdu, apdu_len, se_io_cb, ctx);
1558
1559put_dev:
1560 nfc_put_device(dev);
1561 return rc;
1562}
1563
1564static int nfc_genl_vendor_cmd(struct sk_buff *skb,
1565 struct genl_info *info)
1566{
1567 struct nfc_dev *dev;
1568 const struct nfc_vendor_cmd *cmd;
1569 u32 dev_idx, vid, subcmd;
1570 u8 *data;
1571 size_t data_len;
1572 int i, err;
1573
1574 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
1575 !info->attrs[NFC_ATTR_VENDOR_ID] ||
1576 !info->attrs[NFC_ATTR_VENDOR_SUBCMD])
1577 return -EINVAL;
1578
1579 dev_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
1580 vid = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_ID]);
1581 subcmd = nla_get_u32(info->attrs[NFC_ATTR_VENDOR_SUBCMD]);
1582
1583 dev = nfc_get_device(dev_idx);
1584 if (!dev)
1585 return -ENODEV;
1586
1587 if (!dev->vendor_cmds || !dev->n_vendor_cmds) {
1588 err = -ENODEV;
1589 goto put_dev;
1590 }
1591
1592 if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
1593 data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
1594 data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
1595 if (data_len == 0) {
1596 err = -EINVAL;
1597 goto put_dev;
1598 }
1599 } else {
1600 data = NULL;
1601 data_len = 0;
1602 }
1603
1604 for (i = 0; i < dev->n_vendor_cmds; i++) {
1605 cmd = &dev->vendor_cmds[i];
1606
1607 if (cmd->vendor_id != vid || cmd->subcmd != subcmd)
1608 continue;
1609
1610 dev->cur_cmd_info = info;
1611 err = cmd->doit(dev, data, data_len);
1612 dev->cur_cmd_info = NULL;
1613 goto put_dev;
1614 }
1615
1616 err = -EOPNOTSUPP;
1617
1618put_dev:
1619 nfc_put_device(dev);
1620 return err;
1621}
1622
1623/* message building helper */
1624static inline void *nfc_hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
1625 int flags, u8 cmd)
1626{
1627 /* since there is no private header just add the generic one */
1628 return genlmsg_put(skb, portid, seq, &nfc_genl_family, flags, cmd);
1629}
1630
1631static struct sk_buff *
1632__nfc_alloc_vendor_cmd_skb(struct nfc_dev *dev, int approxlen,
1633 u32 portid, u32 seq,
1634 enum nfc_attrs attr,
1635 u32 oui, u32 subcmd, gfp_t gfp)
1636{
1637 struct sk_buff *skb;
1638 void *hdr;
1639
1640 skb = nlmsg_new(approxlen + 100, gfp);
1641 if (!skb)
1642 return NULL;
1643
1644 hdr = nfc_hdr_put(skb, portid, seq, 0, NFC_CMD_VENDOR);
1645 if (!hdr) {
1646 kfree_skb(skb);
1647 return NULL;
1648 }
1649
1650 if (nla_put_u32(skb, NFC_ATTR_DEVICE_INDEX, dev->idx))
1651 goto nla_put_failure;
1652 if (nla_put_u32(skb, NFC_ATTR_VENDOR_ID, oui))
1653 goto nla_put_failure;
1654 if (nla_put_u32(skb, NFC_ATTR_VENDOR_SUBCMD, subcmd))
1655 goto nla_put_failure;
1656
1657 ((void **)skb->cb)[0] = dev;
1658 ((void **)skb->cb)[1] = hdr;
1659
1660 return skb;
1661
1662nla_put_failure:
1663 kfree_skb(skb);
1664 return NULL;
1665}
1666
1667struct sk_buff *__nfc_alloc_vendor_cmd_reply_skb(struct nfc_dev *dev,
1668 enum nfc_attrs attr,
1669 u32 oui, u32 subcmd,
1670 int approxlen)
1671{
1672 if (WARN_ON(!dev->cur_cmd_info))
1673 return NULL;
1674
1675 return __nfc_alloc_vendor_cmd_skb(dev, approxlen,
1676 dev->cur_cmd_info->snd_portid,
1677 dev->cur_cmd_info->snd_seq, attr,
1678 oui, subcmd, GFP_KERNEL);
1679}
1680EXPORT_SYMBOL(__nfc_alloc_vendor_cmd_reply_skb);
1681
1682int nfc_vendor_cmd_reply(struct sk_buff *skb)
1683{
1684 struct nfc_dev *dev = ((void **)skb->cb)[0];
1685 void *hdr = ((void **)skb->cb)[1];
1686
1687 /* clear CB data for netlink core to own from now on */
1688 memset(skb->cb, 0, sizeof(skb->cb));
1689
1690 if (WARN_ON(!dev->cur_cmd_info)) {
1691 kfree_skb(skb);
1692 return -EINVAL;
1693 }
1694
1695 genlmsg_end(skb, hdr);
1696 return genlmsg_reply(skb, dev->cur_cmd_info);
1697}
1698EXPORT_SYMBOL(nfc_vendor_cmd_reply);
1699
1700static const struct genl_ops nfc_genl_ops[] = {
1701 {
1702 .cmd = NFC_CMD_GET_DEVICE,
1703 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1704 .doit = nfc_genl_get_device,
1705 .dumpit = nfc_genl_dump_devices,
1706 .done = nfc_genl_dump_devices_done,
1707 },
1708 {
1709 .cmd = NFC_CMD_DEV_UP,
1710 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1711 .doit = nfc_genl_dev_up,
1712 .flags = GENL_ADMIN_PERM,
1713 },
1714 {
1715 .cmd = NFC_CMD_DEV_DOWN,
1716 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1717 .doit = nfc_genl_dev_down,
1718 .flags = GENL_ADMIN_PERM,
1719 },
1720 {
1721 .cmd = NFC_CMD_START_POLL,
1722 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1723 .doit = nfc_genl_start_poll,
1724 .flags = GENL_ADMIN_PERM,
1725 },
1726 {
1727 .cmd = NFC_CMD_STOP_POLL,
1728 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1729 .doit = nfc_genl_stop_poll,
1730 .flags = GENL_ADMIN_PERM,
1731 },
1732 {
1733 .cmd = NFC_CMD_DEP_LINK_UP,
1734 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1735 .doit = nfc_genl_dep_link_up,
1736 .flags = GENL_ADMIN_PERM,
1737 },
1738 {
1739 .cmd = NFC_CMD_DEP_LINK_DOWN,
1740 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1741 .doit = nfc_genl_dep_link_down,
1742 .flags = GENL_ADMIN_PERM,
1743 },
1744 {
1745 .cmd = NFC_CMD_GET_TARGET,
1746 .validate = GENL_DONT_VALIDATE_STRICT |
1747 GENL_DONT_VALIDATE_DUMP_STRICT,
1748 .dumpit = nfc_genl_dump_targets,
1749 .done = nfc_genl_dump_targets_done,
1750 },
1751 {
1752 .cmd = NFC_CMD_LLC_GET_PARAMS,
1753 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1754 .doit = nfc_genl_llc_get_params,
1755 },
1756 {
1757 .cmd = NFC_CMD_LLC_SET_PARAMS,
1758 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1759 .doit = nfc_genl_llc_set_params,
1760 .flags = GENL_ADMIN_PERM,
1761 },
1762 {
1763 .cmd = NFC_CMD_LLC_SDREQ,
1764 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1765 .doit = nfc_genl_llc_sdreq,
1766 .flags = GENL_ADMIN_PERM,
1767 },
1768 {
1769 .cmd = NFC_CMD_FW_DOWNLOAD,
1770 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1771 .doit = nfc_genl_fw_download,
1772 .flags = GENL_ADMIN_PERM,
1773 },
1774 {
1775 .cmd = NFC_CMD_ENABLE_SE,
1776 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1777 .doit = nfc_genl_enable_se,
1778 .flags = GENL_ADMIN_PERM,
1779 },
1780 {
1781 .cmd = NFC_CMD_DISABLE_SE,
1782 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1783 .doit = nfc_genl_disable_se,
1784 .flags = GENL_ADMIN_PERM,
1785 },
1786 {
1787 .cmd = NFC_CMD_GET_SE,
1788 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1789 .dumpit = nfc_genl_dump_ses,
1790 .done = nfc_genl_dump_ses_done,
1791 },
1792 {
1793 .cmd = NFC_CMD_SE_IO,
1794 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1795 .doit = nfc_genl_se_io,
1796 .flags = GENL_ADMIN_PERM,
1797 },
1798 {
1799 .cmd = NFC_CMD_ACTIVATE_TARGET,
1800 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1801 .doit = nfc_genl_activate_target,
1802 .flags = GENL_ADMIN_PERM,
1803 },
1804 {
1805 .cmd = NFC_CMD_VENDOR,
1806 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1807 .doit = nfc_genl_vendor_cmd,
1808 .flags = GENL_ADMIN_PERM,
1809 },
1810 {
1811 .cmd = NFC_CMD_DEACTIVATE_TARGET,
1812 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1813 .doit = nfc_genl_deactivate_target,
1814 .flags = GENL_ADMIN_PERM,
1815 },
1816};
1817
1818static struct genl_family nfc_genl_family __ro_after_init = {
1819 .hdrsize = 0,
1820 .name = NFC_GENL_NAME,
1821 .version = NFC_GENL_VERSION,
1822 .maxattr = NFC_ATTR_MAX,
1823 .policy = nfc_genl_policy,
1824 .module = THIS_MODULE,
1825 .ops = nfc_genl_ops,
1826 .n_ops = ARRAY_SIZE(nfc_genl_ops),
1827 .resv_start_op = NFC_CMD_DEACTIVATE_TARGET + 1,
1828 .mcgrps = nfc_genl_mcgrps,
1829 .n_mcgrps = ARRAY_SIZE(nfc_genl_mcgrps),
1830};
1831
1832
1833struct urelease_work {
1834 struct work_struct w;
1835 u32 portid;
1836};
1837
1838static void nfc_urelease_event_work(struct work_struct *work)
1839{
1840 struct urelease_work *w = container_of(work, struct urelease_work, w);
1841 struct class_dev_iter iter;
1842 struct nfc_dev *dev;
1843
1844 pr_debug("portid %d\n", w->portid);
1845
1846 mutex_lock(&nfc_devlist_mutex);
1847
1848 nfc_device_iter_init(&iter);
1849 dev = nfc_device_iter_next(&iter);
1850
1851 while (dev) {
1852 mutex_lock(&dev->genl_data.genl_data_mutex);
1853
1854 if (dev->genl_data.poll_req_portid == w->portid) {
1855 nfc_stop_poll(dev);
1856 dev->genl_data.poll_req_portid = 0;
1857 }
1858
1859 mutex_unlock(&dev->genl_data.genl_data_mutex);
1860
1861 dev = nfc_device_iter_next(&iter);
1862 }
1863
1864 nfc_device_iter_exit(&iter);
1865
1866 mutex_unlock(&nfc_devlist_mutex);
1867
1868 kfree(w);
1869}
1870
1871static int nfc_genl_rcv_nl_event(struct notifier_block *this,
1872 unsigned long event, void *ptr)
1873{
1874 struct netlink_notify *n = ptr;
1875 struct urelease_work *w;
1876
1877 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
1878 goto out;
1879
1880 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
1881
1882 w = kmalloc(sizeof(*w), GFP_ATOMIC);
1883 if (w) {
1884 INIT_WORK(&w->w, nfc_urelease_event_work);
1885 w->portid = n->portid;
1886 schedule_work(&w->w);
1887 }
1888
1889out:
1890 return NOTIFY_DONE;
1891}
1892
1893void nfc_genl_data_init(struct nfc_genl_data *genl_data)
1894{
1895 genl_data->poll_req_portid = 0;
1896 mutex_init(&genl_data->genl_data_mutex);
1897}
1898
1899void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
1900{
1901 mutex_destroy(&genl_data->genl_data_mutex);
1902}
1903
1904static struct notifier_block nl_notifier = {
1905 .notifier_call = nfc_genl_rcv_nl_event,
1906};
1907
1908/**
1909 * nfc_genl_init() - Initialize netlink interface
1910 *
1911 * This initialization function registers the nfc netlink family.
1912 */
1913int __init nfc_genl_init(void)
1914{
1915 int rc;
1916
1917 rc = genl_register_family(&nfc_genl_family);
1918 if (rc)
1919 return rc;
1920
1921 netlink_register_notifier(&nl_notifier);
1922
1923 return 0;
1924}
1925
1926/**
1927 * nfc_genl_exit() - Deinitialize netlink interface
1928 *
1929 * This exit function unregisters the nfc netlink family.
1930 */
1931void nfc_genl_exit(void)
1932{
1933 netlink_unregister_notifier(&nl_notifier);
1934 genl_unregister_family(&nfc_genl_family);
1935}