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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/*
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#include <net/genetlink.h>
25#include <linux/nfc.h>
26#include <linux/slab.h>
27
28#include "nfc.h"
29
30static struct genl_multicast_group nfc_genl_event_mcgrp = {
31 .name = NFC_GENL_MCAST_EVENT_NAME,
32};
33
34struct genl_family nfc_genl_family = {
35 .id = GENL_ID_GENERATE,
36 .hdrsize = 0,
37 .name = NFC_GENL_NAME,
38 .version = NFC_GENL_VERSION,
39 .maxattr = NFC_ATTR_MAX,
40};
41
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};
48
49static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
50 struct netlink_callback *cb, int flags)
51{
52 void *hdr;
53
54 nfc_dbg("entry");
55
56 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
57 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
58 if (!hdr)
59 return -EMSGSIZE;
60
61 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
62
63 NLA_PUT_U32(msg, NFC_ATTR_TARGET_INDEX, target->idx);
64 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS,
65 target->supported_protocols);
66 NLA_PUT_U16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res);
67 NLA_PUT_U8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res);
68
69 return genlmsg_end(msg, hdr);
70
71nla_put_failure:
72 genlmsg_cancel(msg, hdr);
73 return -EMSGSIZE;
74}
75
76static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
77{
78 struct nfc_dev *dev;
79 int rc;
80 u32 idx;
81
82 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
83 nfc_genl_family.attrbuf,
84 nfc_genl_family.maxattr,
85 nfc_genl_policy);
86 if (rc < 0)
87 return ERR_PTR(rc);
88
89 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
90 return ERR_PTR(-EINVAL);
91
92 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
93
94 dev = nfc_get_device(idx);
95 if (!dev)
96 return ERR_PTR(-ENODEV);
97
98 return dev;
99}
100
101static int nfc_genl_dump_targets(struct sk_buff *skb,
102 struct netlink_callback *cb)
103{
104 int i = cb->args[0];
105 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
106 int rc;
107
108 nfc_dbg("entry");
109
110 if (!dev) {
111 dev = __get_device_from_cb(cb);
112 if (IS_ERR(dev))
113 return PTR_ERR(dev);
114
115 cb->args[1] = (long) dev;
116 }
117
118 spin_lock_bh(&dev->targets_lock);
119
120 cb->seq = dev->targets_generation;
121
122 while (i < dev->n_targets) {
123 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
124 NLM_F_MULTI);
125 if (rc < 0)
126 break;
127
128 i++;
129 }
130
131 spin_unlock_bh(&dev->targets_lock);
132
133 cb->args[0] = i;
134
135 return skb->len;
136}
137
138static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
139{
140 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
141
142 nfc_dbg("entry");
143
144 if (dev)
145 nfc_put_device(dev);
146
147 return 0;
148}
149
150int nfc_genl_targets_found(struct nfc_dev *dev)
151{
152 struct sk_buff *msg;
153 void *hdr;
154
155 nfc_dbg("entry");
156
157 dev->genl_data.poll_req_pid = 0;
158
159 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
160 if (!msg)
161 return -ENOMEM;
162
163 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
164 NFC_EVENT_TARGETS_FOUND);
165 if (!hdr)
166 goto free_msg;
167
168 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
169
170 genlmsg_end(msg, hdr);
171
172 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
173
174nla_put_failure:
175 genlmsg_cancel(msg, hdr);
176free_msg:
177 nlmsg_free(msg);
178 return -EMSGSIZE;
179}
180
181int nfc_genl_device_added(struct nfc_dev *dev)
182{
183 struct sk_buff *msg;
184 void *hdr;
185
186 nfc_dbg("entry");
187
188 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
189 if (!msg)
190 return -ENOMEM;
191
192 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
193 NFC_EVENT_DEVICE_ADDED);
194 if (!hdr)
195 goto free_msg;
196
197 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
198 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
199 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
200
201 genlmsg_end(msg, hdr);
202
203 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
204
205 return 0;
206
207nla_put_failure:
208 genlmsg_cancel(msg, hdr);
209free_msg:
210 nlmsg_free(msg);
211 return -EMSGSIZE;
212}
213
214int nfc_genl_device_removed(struct nfc_dev *dev)
215{
216 struct sk_buff *msg;
217 void *hdr;
218
219 nfc_dbg("entry");
220
221 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
222 if (!msg)
223 return -ENOMEM;
224
225 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
226 NFC_EVENT_DEVICE_REMOVED);
227 if (!hdr)
228 goto free_msg;
229
230 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
231
232 genlmsg_end(msg, hdr);
233
234 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
235
236 return 0;
237
238nla_put_failure:
239 genlmsg_cancel(msg, hdr);
240free_msg:
241 nlmsg_free(msg);
242 return -EMSGSIZE;
243}
244
245static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
246 u32 pid, u32 seq,
247 struct netlink_callback *cb,
248 int flags)
249{
250 void *hdr;
251
252 nfc_dbg("entry");
253
254 hdr = genlmsg_put(msg, pid, seq, &nfc_genl_family, flags,
255 NFC_CMD_GET_DEVICE);
256 if (!hdr)
257 return -EMSGSIZE;
258
259 if (cb)
260 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
261
262 NLA_PUT_STRING(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev));
263 NLA_PUT_U32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx);
264 NLA_PUT_U32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols);
265
266 return genlmsg_end(msg, hdr);
267
268nla_put_failure:
269 genlmsg_cancel(msg, hdr);
270 return -EMSGSIZE;
271}
272
273static int nfc_genl_dump_devices(struct sk_buff *skb,
274 struct netlink_callback *cb)
275{
276 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
277 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
278 bool first_call = false;
279
280 nfc_dbg("entry");
281
282 if (!iter) {
283 first_call = true;
284 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
285 if (!iter)
286 return -ENOMEM;
287 cb->args[0] = (long) iter;
288 }
289
290 mutex_lock(&nfc_devlist_mutex);
291
292 cb->seq = nfc_devlist_generation;
293
294 if (first_call) {
295 nfc_device_iter_init(iter);
296 dev = nfc_device_iter_next(iter);
297 }
298
299 while (dev) {
300 int rc;
301
302 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).pid,
303 cb->nlh->nlmsg_seq,
304 cb, NLM_F_MULTI);
305 if (rc < 0)
306 break;
307
308 dev = nfc_device_iter_next(iter);
309 }
310
311 mutex_unlock(&nfc_devlist_mutex);
312
313 cb->args[1] = (long) dev;
314
315 return skb->len;
316}
317
318static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
319{
320 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
321
322 nfc_dbg("entry");
323
324 nfc_device_iter_exit(iter);
325 kfree(iter);
326
327 return 0;
328}
329
330static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
331{
332 struct sk_buff *msg;
333 struct nfc_dev *dev;
334 u32 idx;
335 int rc = -ENOBUFS;
336
337 nfc_dbg("entry");
338
339 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
340 return -EINVAL;
341
342 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
343
344 dev = nfc_get_device(idx);
345 if (!dev)
346 return -ENODEV;
347
348 msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
349 if (!msg) {
350 rc = -ENOMEM;
351 goto out_putdev;
352 }
353
354 rc = nfc_genl_send_device(msg, dev, info->snd_pid, info->snd_seq,
355 NULL, 0);
356 if (rc < 0)
357 goto out_free;
358
359 nfc_put_device(dev);
360
361 return genlmsg_reply(msg, info);
362
363out_free:
364 nlmsg_free(msg);
365out_putdev:
366 nfc_put_device(dev);
367 return rc;
368}
369
370static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
371{
372 struct nfc_dev *dev;
373 int rc;
374 u32 idx;
375 u32 protocols;
376
377 nfc_dbg("entry");
378
379 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
380 !info->attrs[NFC_ATTR_PROTOCOLS])
381 return -EINVAL;
382
383 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
384 protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
385
386 dev = nfc_get_device(idx);
387 if (!dev)
388 return -ENODEV;
389
390 mutex_lock(&dev->genl_data.genl_data_mutex);
391
392 rc = nfc_start_poll(dev, protocols);
393 if (!rc)
394 dev->genl_data.poll_req_pid = info->snd_pid;
395
396 mutex_unlock(&dev->genl_data.genl_data_mutex);
397
398 nfc_put_device(dev);
399 return rc;
400}
401
402static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
403{
404 struct nfc_dev *dev;
405 int rc;
406 u32 idx;
407
408 nfc_dbg("entry");
409
410 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
411 return -EINVAL;
412
413 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
414
415 dev = nfc_get_device(idx);
416 if (!dev)
417 return -ENODEV;
418
419 mutex_lock(&dev->genl_data.genl_data_mutex);
420
421 if (dev->genl_data.poll_req_pid != info->snd_pid) {
422 rc = -EBUSY;
423 goto out;
424 }
425
426 rc = nfc_stop_poll(dev);
427 dev->genl_data.poll_req_pid = 0;
428
429out:
430 mutex_unlock(&dev->genl_data.genl_data_mutex);
431 nfc_put_device(dev);
432 return rc;
433}
434
435static struct genl_ops nfc_genl_ops[] = {
436 {
437 .cmd = NFC_CMD_GET_DEVICE,
438 .doit = nfc_genl_get_device,
439 .dumpit = nfc_genl_dump_devices,
440 .done = nfc_genl_dump_devices_done,
441 .policy = nfc_genl_policy,
442 },
443 {
444 .cmd = NFC_CMD_START_POLL,
445 .doit = nfc_genl_start_poll,
446 .policy = nfc_genl_policy,
447 },
448 {
449 .cmd = NFC_CMD_STOP_POLL,
450 .doit = nfc_genl_stop_poll,
451 .policy = nfc_genl_policy,
452 },
453 {
454 .cmd = NFC_CMD_GET_TARGET,
455 .dumpit = nfc_genl_dump_targets,
456 .done = nfc_genl_dump_targets_done,
457 .policy = nfc_genl_policy,
458 },
459};
460
461static int nfc_genl_rcv_nl_event(struct notifier_block *this,
462 unsigned long event, void *ptr)
463{
464 struct netlink_notify *n = ptr;
465 struct class_dev_iter iter;
466 struct nfc_dev *dev;
467
468 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
469 goto out;
470
471 nfc_dbg("NETLINK_URELEASE event from id %d", n->pid);
472
473 nfc_device_iter_init(&iter);
474 dev = nfc_device_iter_next(&iter);
475
476 while (dev) {
477 mutex_lock(&dev->genl_data.genl_data_mutex);
478 if (dev->genl_data.poll_req_pid == n->pid) {
479 nfc_stop_poll(dev);
480 dev->genl_data.poll_req_pid = 0;
481 }
482 mutex_unlock(&dev->genl_data.genl_data_mutex);
483 dev = nfc_device_iter_next(&iter);
484 }
485
486 nfc_device_iter_exit(&iter);
487
488out:
489 return NOTIFY_DONE;
490}
491
492void nfc_genl_data_init(struct nfc_genl_data *genl_data)
493{
494 genl_data->poll_req_pid = 0;
495 mutex_init(&genl_data->genl_data_mutex);
496}
497
498void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
499{
500 mutex_destroy(&genl_data->genl_data_mutex);
501}
502
503static struct notifier_block nl_notifier = {
504 .notifier_call = nfc_genl_rcv_nl_event,
505};
506
507/**
508 * nfc_genl_init() - Initialize netlink interface
509 *
510 * This initialization function registers the nfc netlink family.
511 */
512int __init nfc_genl_init(void)
513{
514 int rc;
515
516 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
517 ARRAY_SIZE(nfc_genl_ops));
518 if (rc)
519 return rc;
520
521 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
522
523 netlink_register_notifier(&nl_notifier);
524
525 return rc;
526}
527
528/**
529 * nfc_genl_exit() - Deinitialize netlink interface
530 *
531 * This exit function unregisters the nfc netlink family.
532 */
533void nfc_genl_exit(void)
534{
535 netlink_unregister_notifier(&nl_notifier);
536 genl_unregister_family(&nfc_genl_family);
537}