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NFC: Purge LLCP socket Tx queues when being disconnected
[deliverable/linux.git] / net / nfc / netlink.c
CommitLineData
4d12b8b1
LRV		 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
52858b51 24#define pr_fmt(fmt) KBUILD_MODNAME ": %s: " fmt, __func__
20c239c1 25
4d12b8b1
LRV		 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
e5fe4cf8 36static struct genl_family nfc_genl_family = {
4d12b8b1
LRV		 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 },
1ed28f61
SO		 49 [NFC_ATTR_COMM_MODE] = { .type = NLA_U8 },
50 [NFC_ATTR_RF_MODE] = { .type = NLA_U8 },
c970a1ac 51 [NFC_ATTR_DEVICE_POWERED] = { .type = NLA_U8 },
fe7c5800
SO		 52 [NFC_ATTR_IM_PROTOCOLS] = { .type = NLA_U32 },
53 [NFC_ATTR_TM_PROTOCOLS] = { .type = NLA_U32 },
4d12b8b1
LRV		 54};
55
56static int nfc_genl_send_target(struct sk_buff *msg, struct nfc_target *target,
0a40acb2 57 struct netlink_callback *cb, int flags)
4d12b8b1
LRV		 58{
59 void *hdr;
60
15e47304 61 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
0a40acb2 62 &nfc_genl_family, flags, NFC_CMD_GET_TARGET);
4d12b8b1
LRV		 63 if (!hdr)
64 return -EMSGSIZE;
65
66 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
67
1e6428d8
DM		 68 if (nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target->idx) ||
69 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, target->supported_protocols) ||
70 nla_put_u16(msg, NFC_ATTR_TARGET_SENS_RES, target->sens_res) ||
71 nla_put_u8(msg, NFC_ATTR_TARGET_SEL_RES, target->sel_res))
72 goto nla_put_failure;
73 if (target->nfcid1_len > 0 &&
74 nla_put(msg, NFC_ATTR_TARGET_NFCID1, target->nfcid1_len,
75 target->nfcid1))
76 goto nla_put_failure;
77 if (target->sensb_res_len > 0 &&
78 nla_put(msg, NFC_ATTR_TARGET_SENSB_RES, target->sensb_res_len,
79 target->sensb_res))
80 goto nla_put_failure;
81 if (target->sensf_res_len > 0 &&
82 nla_put(msg, NFC_ATTR_TARGET_SENSF_RES, target->sensf_res_len,
83 target->sensf_res))
84 goto nla_put_failure;
4d12b8b1
LRV		 85
86 return genlmsg_end(msg, hdr);
87
88nla_put_failure:
89 genlmsg_cancel(msg, hdr);
90 return -EMSGSIZE;
91}
92
93static struct nfc_dev *__get_device_from_cb(struct netlink_callback *cb)
94{
95 struct nfc_dev *dev;
96 int rc;
97 u32 idx;
98
99 rc = nlmsg_parse(cb->nlh, GENL_HDRLEN + nfc_genl_family.hdrsize,
0a40acb2
SO		 100 nfc_genl_family.attrbuf,
101 nfc_genl_family.maxattr,
102 nfc_genl_policy);
4d12b8b1
LRV		 103 if (rc < 0)
104 return ERR_PTR(rc);
105
106 if (!nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX])
107 return ERR_PTR(-EINVAL);
108
109 idx = nla_get_u32(nfc_genl_family.attrbuf[NFC_ATTR_DEVICE_INDEX]);
110
111 dev = nfc_get_device(idx);
112 if (!dev)
113 return ERR_PTR(-ENODEV);
114
115 return dev;
116}
117
118static int nfc_genl_dump_targets(struct sk_buff *skb,
0a40acb2 119 struct netlink_callback *cb)
4d12b8b1
LRV		 120{
121 int i = cb->args[0];
122 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
123 int rc;
124
4d12b8b1
LRV		 125 if (!dev) {
126 dev = __get_device_from_cb(cb);
127 if (IS_ERR(dev))
128 return PTR_ERR(dev);
129
130 cb->args[1] = (long) dev;
131 }
132
d4ccb132 133 device_lock(&dev->dev);
4d12b8b1
LRV		 134
135 cb->seq = dev->targets_generation;
136
137 while (i < dev->n_targets) {
138 rc = nfc_genl_send_target(skb, &dev->targets[i], cb,
0a40acb2 139 NLM_F_MULTI);
4d12b8b1
LRV		 140 if (rc < 0)
141 break;
142
143 i++;
144 }
145
d4ccb132 146 device_unlock(&dev->dev);
4d12b8b1
LRV		 147
148 cb->args[0] = i;
149
150 return skb->len;
151}
152
153static int nfc_genl_dump_targets_done(struct netlink_callback *cb)
154{
155 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
156
4d12b8b1
LRV		 157 if (dev)
158 nfc_put_device(dev);
159
160 return 0;
161}
162
163int nfc_genl_targets_found(struct nfc_dev *dev)
164{
165 struct sk_buff *msg;
166 void *hdr;
167
15e47304 168 dev->genl_data.poll_req_portid = 0;
4d12b8b1 169
58050fce 170 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
4d12b8b1
LRV		 171 if (!msg)
172 return -ENOMEM;
173
174 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2 175 NFC_EVENT_TARGETS_FOUND);
4d12b8b1
LRV		 176 if (!hdr)
177 goto free_msg;
178
1e6428d8
DM		 179 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
180 goto nla_put_failure;
4d12b8b1
LRV		 181
182 genlmsg_end(msg, hdr);
183
184 return genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
185
186nla_put_failure:
187 genlmsg_cancel(msg, hdr);
188free_msg:
189 nlmsg_free(msg);
190 return -EMSGSIZE;
191}
192
8112a5c9
SO		 193int nfc_genl_target_lost(struct nfc_dev *dev, u32 target_idx)
194{
195 struct sk_buff *msg;
196 void *hdr;
197
58050fce 198 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
8112a5c9
SO		 199 if (!msg)
200 return -ENOMEM;
201
202 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
203 NFC_EVENT_TARGET_LOST);
204 if (!hdr)
205 goto free_msg;
206
59ef43e6
JL		 207 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
208 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
209 goto nla_put_failure;
8112a5c9
SO		 210
211 genlmsg_end(msg, hdr);
212
213 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
214
215 return 0;
216
fc40a8c1
SO		 217nla_put_failure:
218 genlmsg_cancel(msg, hdr);
219free_msg:
220 nlmsg_free(msg);
221 return -EMSGSIZE;
222}
223
224int nfc_genl_tm_activated(struct nfc_dev *dev, u32 protocol)
225{
226 struct sk_buff *msg;
227 void *hdr;
228
58050fce 229 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
fc40a8c1
SO		 230 if (!msg)
231 return -ENOMEM;
232
233 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
234 NFC_EVENT_TM_ACTIVATED);
235 if (!hdr)
236 goto free_msg;
237
238 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
239 goto nla_put_failure;
240 if (nla_put_u32(msg, NFC_ATTR_TM_PROTOCOLS, protocol))
241 goto nla_put_failure;
242
243 genlmsg_end(msg, hdr);
244
245 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
246
247 return 0;
248
249nla_put_failure:
250 genlmsg_cancel(msg, hdr);
251free_msg:
252 nlmsg_free(msg);
253 return -EMSGSIZE;
254}
255
256int nfc_genl_tm_deactivated(struct nfc_dev *dev)
257{
258 struct sk_buff *msg;
259 void *hdr;
260
58050fce 261 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
fc40a8c1
SO		 262 if (!msg)
263 return -ENOMEM;
264
265 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
266 NFC_EVENT_TM_DEACTIVATED);
267 if (!hdr)
268 goto free_msg;
269
270 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
271 goto nla_put_failure;
272
273 genlmsg_end(msg, hdr);
274
275 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
276
277 return 0;
278
8112a5c9
SO		 279nla_put_failure:
280 genlmsg_cancel(msg, hdr);
281free_msg:
282 nlmsg_free(msg);
283 return -EMSGSIZE;
284}
285
4d12b8b1
LRV		 286int nfc_genl_device_added(struct nfc_dev *dev)
287{
288 struct sk_buff *msg;
289 void *hdr;
290
58050fce 291 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
4d12b8b1
LRV		 292 if (!msg)
293 return -ENOMEM;
294
295 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2 296 NFC_EVENT_DEVICE_ADDED);
4d12b8b1
LRV		 297 if (!hdr)
298 goto free_msg;
299
1e6428d8
DM		 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;
4d12b8b1
LRV		 305
306 genlmsg_end(msg, hdr);
307
308 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
309
310 return 0;
311
312nla_put_failure:
313 genlmsg_cancel(msg, hdr);
314free_msg:
315 nlmsg_free(msg);
316 return -EMSGSIZE;
317}
318
319int nfc_genl_device_removed(struct nfc_dev *dev)
320{
321 struct sk_buff *msg;
322 void *hdr;
323
58050fce 324 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
4d12b8b1
LRV		 325 if (!msg)
326 return -ENOMEM;
327
328 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2 329 NFC_EVENT_DEVICE_REMOVED);
4d12b8b1
LRV		 330 if (!hdr)
331 goto free_msg;
332
1e6428d8
DM		 333 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
334 goto nla_put_failure;
4d12b8b1
LRV		 335
336 genlmsg_end(msg, hdr);
337
338 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_KERNEL);
339
340 return 0;
341
342nla_put_failure:
343 genlmsg_cancel(msg, hdr);
344free_msg:
345 nlmsg_free(msg);
346 return -EMSGSIZE;
347}
348
349static int nfc_genl_send_device(struct sk_buff *msg, struct nfc_dev *dev,
15e47304 350 u32 portid, u32 seq,
0a40acb2
SO		 351 struct netlink_callback *cb,
352 int flags)
4d12b8b1
LRV		 353{
354 void *hdr;
355
15e47304 356 hdr = genlmsg_put(msg, portid, seq, &nfc_genl_family, flags,
0a40acb2 357 NFC_CMD_GET_DEVICE);
4d12b8b1
LRV		 358 if (!hdr)
359 return -EMSGSIZE;
360
361 if (cb)
362 genl_dump_check_consistent(cb, hdr, &nfc_genl_family);
363
1e6428d8
DM		 364 if (nla_put_string(msg, NFC_ATTR_DEVICE_NAME, nfc_device_name(dev)) ||
365 nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx) ||
366 nla_put_u32(msg, NFC_ATTR_PROTOCOLS, dev->supported_protocols) ||
7ad39395
TE		 367 nla_put_u8(msg, NFC_ATTR_DEVICE_POWERED, dev->dev_up) ||
368 nla_put_u8(msg, NFC_ATTR_RF_MODE, dev->rf_mode))
1e6428d8 369 goto nla_put_failure;
4d12b8b1
LRV		 370
371 return genlmsg_end(msg, hdr);
372
373nla_put_failure:
374 genlmsg_cancel(msg, hdr);
375 return -EMSGSIZE;
376}
377
378static int nfc_genl_dump_devices(struct sk_buff *skb,
0a40acb2 379 struct netlink_callback *cb)
4d12b8b1
LRV		 380{
381 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
382 struct nfc_dev *dev = (struct nfc_dev *) cb->args[1];
383 bool first_call = false;
384
4d12b8b1
LRV		 385 if (!iter) {
386 first_call = true;
387 iter = kmalloc(sizeof(struct class_dev_iter), GFP_KERNEL);
388 if (!iter)
389 return -ENOMEM;
390 cb->args[0] = (long) iter;
391 }
392
393 mutex_lock(&nfc_devlist_mutex);
394
395 cb->seq = nfc_devlist_generation;
396
397 if (first_call) {
398 nfc_device_iter_init(iter);
399 dev = nfc_device_iter_next(iter);
400 }
401
402 while (dev) {
403 int rc;
404
15e47304 405 rc = nfc_genl_send_device(skb, dev, NETLINK_CB(cb->skb).portid,
0a40acb2 406 cb->nlh->nlmsg_seq, cb, NLM_F_MULTI);
4d12b8b1
LRV		 407 if (rc < 0)
408 break;
409
410 dev = nfc_device_iter_next(iter);
411 }
412
413 mutex_unlock(&nfc_devlist_mutex);
414
415 cb->args[1] = (long) dev;
416
417 return skb->len;
418}
419
420static int nfc_genl_dump_devices_done(struct netlink_callback *cb)
421{
422 struct class_dev_iter *iter = (struct class_dev_iter *) cb->args[0];
423
4d12b8b1
LRV		 424 nfc_device_iter_exit(iter);
425 kfree(iter);
426
427 return 0;
428}
429
1ed28f61 430int nfc_genl_dep_link_up_event(struct nfc_dev *dev, u32 target_idx,
0a40acb2 431 u8 comm_mode, u8 rf_mode)
1ed28f61
SO		 432{
433 struct sk_buff *msg;
434 void *hdr;
435
436 pr_debug("DEP link is up\n");
437
58050fce 438 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1ed28f61
SO		 439 if (!msg)
440 return -ENOMEM;
441
0a40acb2 442 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0, NFC_CMD_DEP_LINK_UP);
1ed28f61
SO		 443 if (!hdr)
444 goto free_msg;
445
1e6428d8
DM		 446 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
447 goto nla_put_failure;
448 if (rf_mode == NFC_RF_INITIATOR &&
449 nla_put_u32(msg, NFC_ATTR_TARGET_INDEX, target_idx))
450 goto nla_put_failure;
451 if (nla_put_u8(msg, NFC_ATTR_COMM_MODE, comm_mode) ||
452 nla_put_u8(msg, NFC_ATTR_RF_MODE, rf_mode))
453 goto nla_put_failure;
1ed28f61
SO		 454
455 genlmsg_end(msg, hdr);
456
457 dev->dep_link_up = true;
458
459 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
460
461 return 0;
462
463nla_put_failure:
464 genlmsg_cancel(msg, hdr);
465free_msg:
466 nlmsg_free(msg);
467 return -EMSGSIZE;
468}
469
470int nfc_genl_dep_link_down_event(struct nfc_dev *dev)
471{
472 struct sk_buff *msg;
473 void *hdr;
474
475 pr_debug("DEP link is down\n");
476
58050fce 477 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1ed28f61
SO		 478 if (!msg)
479 return -ENOMEM;
480
481 hdr = genlmsg_put(msg, 0, 0, &nfc_genl_family, 0,
0a40acb2 482 NFC_CMD_DEP_LINK_DOWN);
1ed28f61
SO		 483 if (!hdr)
484 goto free_msg;
485
1e6428d8
DM		 486 if (nla_put_u32(msg, NFC_ATTR_DEVICE_INDEX, dev->idx))
487 goto nla_put_failure;
1ed28f61
SO		 488
489 genlmsg_end(msg, hdr);
490
491 genlmsg_multicast(msg, 0, nfc_genl_event_mcgrp.id, GFP_ATOMIC);
492
493 return 0;
494
495nla_put_failure:
496 genlmsg_cancel(msg, hdr);
497free_msg:
498 nlmsg_free(msg);
499 return -EMSGSIZE;
500}
501
4d12b8b1
LRV		 502static int nfc_genl_get_device(struct sk_buff *skb, struct genl_info *info)
503{
504 struct sk_buff *msg;
505 struct nfc_dev *dev;
506 u32 idx;
507 int rc = -ENOBUFS;
508
4d12b8b1
LRV		 509 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
510 return -EINVAL;
511
512 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
513
514 dev = nfc_get_device(idx);
515 if (!dev)
516 return -ENODEV;
517
58050fce 518 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
4d12b8b1
LRV		 519 if (!msg) {
520 rc = -ENOMEM;
521 goto out_putdev;
522 }
523
15e47304 524 rc = nfc_genl_send_device(msg, dev, info->snd_portid, info->snd_seq,
0a40acb2 525 NULL, 0);
4d12b8b1
LRV		 526 if (rc < 0)
527 goto out_free;
528
529 nfc_put_device(dev);
530
531 return genlmsg_reply(msg, info);
532
533out_free:
534 nlmsg_free(msg);
535out_putdev:
536 nfc_put_device(dev);
537 return rc;
538}
539
8b3fe7b5
IE		 540static int nfc_genl_dev_up(struct sk_buff *skb, struct genl_info *info)
541{
542 struct nfc_dev *dev;
543 int rc;
544 u32 idx;
545
8b3fe7b5
IE		 546 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
547 return -EINVAL;
548
549 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
550
551 dev = nfc_get_device(idx);
552 if (!dev)
553 return -ENODEV;
554
555 rc = nfc_dev_up(dev);
556
557 nfc_put_device(dev);
558 return rc;
559}
560
561static int nfc_genl_dev_down(struct sk_buff *skb, struct genl_info *info)
562{
563 struct nfc_dev *dev;
564 int rc;
565 u32 idx;
566
8b3fe7b5
IE		 567 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
568 return -EINVAL;
569
570 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
571
572 dev = nfc_get_device(idx);
573 if (!dev)
574 return -ENODEV;
575
576 rc = nfc_dev_down(dev);
577
578 nfc_put_device(dev);
579 return rc;
580}
581
4d12b8b1
LRV		 582static int nfc_genl_start_poll(struct sk_buff *skb, struct genl_info *info)
583{
584 struct nfc_dev *dev;
585 int rc;
586 u32 idx;
fe7c5800 587 u32 im_protocols = 0, tm_protocols = 0;
4d12b8b1 588
1ed28f61
SO		 589 pr_debug("Poll start\n");
590
4d12b8b1 591 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
fe7c5800
SO		 592 ((!info->attrs[NFC_ATTR_IM_PROTOCOLS] &&
593 !info->attrs[NFC_ATTR_PROTOCOLS]) &&
0f450772 594 !info->attrs[NFC_ATTR_TM_PROTOCOLS]))
4d12b8b1
LRV		 595 return -EINVAL;
596
597 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
fe7c5800
SO		 598
599 if (info->attrs[NFC_ATTR_TM_PROTOCOLS])
600 tm_protocols = nla_get_u32(info->attrs[NFC_ATTR_TM_PROTOCOLS]);
fe7c5800
SO		 601
602 if (info->attrs[NFC_ATTR_IM_PROTOCOLS])
603 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_IM_PROTOCOLS]);
5e50ee3a
SO		 604 else if (info->attrs[NFC_ATTR_PROTOCOLS])
605 im_protocols = nla_get_u32(info->attrs[NFC_ATTR_PROTOCOLS]);
4d12b8b1
LRV		 606
607 dev = nfc_get_device(idx);
608 if (!dev)
609 return -ENODEV;
610
611 mutex_lock(&dev->genl_data.genl_data_mutex);
612
fe7c5800 613 rc = nfc_start_poll(dev, im_protocols, tm_protocols);
4d12b8b1 614 if (!rc)
15e47304 615 dev->genl_data.poll_req_portid = info->snd_portid;
4d12b8b1
LRV		 616
617 mutex_unlock(&dev->genl_data.genl_data_mutex);
618
619 nfc_put_device(dev);
620 return rc;
621}
622
623static int nfc_genl_stop_poll(struct sk_buff *skb, struct genl_info *info)
624{
625 struct nfc_dev *dev;
626 int rc;
627 u32 idx;
628
4d12b8b1
LRV		 629 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
630 return -EINVAL;
631
632 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
633
634 dev = nfc_get_device(idx);
635 if (!dev)
636 return -ENODEV;
637
a831b913
SO		 638 device_lock(&dev->dev);
639
640 if (!dev->polling) {
641 device_unlock(&dev->dev);
642 return -EINVAL;
643 }
644
645 device_unlock(&dev->dev);
646
4d12b8b1
LRV		 647 mutex_lock(&dev->genl_data.genl_data_mutex);
648
15e47304 649 if (dev->genl_data.poll_req_portid != info->snd_portid) {
4d12b8b1
LRV		 650 rc = -EBUSY;
651 goto out;
652 }
653
654 rc = nfc_stop_poll(dev);
15e47304 655 dev->genl_data.poll_req_portid = 0;
4d12b8b1
LRV		 656
657out:
658 mutex_unlock(&dev->genl_data.genl_data_mutex);
659 nfc_put_device(dev);
660 return rc;
661}
662
1ed28f61
SO		 663static int nfc_genl_dep_link_up(struct sk_buff *skb, struct genl_info *info)
664{
665 struct nfc_dev *dev;
666 int rc, tgt_idx;
667 u32 idx;
47807d3d 668 u8 comm;
1ed28f61
SO		 669
670 pr_debug("DEP link up\n");
671
672 if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
47807d3d 673 !info->attrs[NFC_ATTR_COMM_MODE])
1ed28f61
SO		 674 return -EINVAL;
675
676 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
677 if (!info->attrs[NFC_ATTR_TARGET_INDEX])
678 tgt_idx = NFC_TARGET_IDX_ANY;
679 else
680 tgt_idx = nla_get_u32(info->attrs[NFC_ATTR_TARGET_INDEX]);
681
682 comm = nla_get_u8(info->attrs[NFC_ATTR_COMM_MODE]);
1ed28f61
SO		 683
684 if (comm != NFC_COMM_ACTIVE && comm != NFC_COMM_PASSIVE)
685 return -EINVAL;
686
1ed28f61
SO		 687 dev = nfc_get_device(idx);
688 if (!dev)
689 return -ENODEV;
690
47807d3d 691 rc = nfc_dep_link_up(dev, tgt_idx, comm);
1ed28f61
SO		 692
693 nfc_put_device(dev);
694
695 return rc;
696}
697
698static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
699{
700 struct nfc_dev *dev;
701 int rc;
702 u32 idx;
703
704 if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
705 return -EINVAL;
706
707 idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
708
709 dev = nfc_get_device(idx);
710 if (!dev)
711 return -ENODEV;
712
713 rc = nfc_dep_link_down(dev);
714
715 nfc_put_device(dev);
716 return rc;
717}
718
4d12b8b1
LRV		 719static struct genl_ops nfc_genl_ops[] = {
720 {
721 .cmd = NFC_CMD_GET_DEVICE,
722 .doit = nfc_genl_get_device,
723 .dumpit = nfc_genl_dump_devices,
724 .done = nfc_genl_dump_devices_done,
725 .policy = nfc_genl_policy,
8b3fe7b5
IE		 726 },
727 {
728 .cmd = NFC_CMD_DEV_UP,
729 .doit = nfc_genl_dev_up,
730 .policy = nfc_genl_policy,
731 },
732 {
733 .cmd = NFC_CMD_DEV_DOWN,
734 .doit = nfc_genl_dev_down,
735 .policy = nfc_genl_policy,
4d12b8b1
LRV		 736 },
737 {
738 .cmd = NFC_CMD_START_POLL,
739 .doit = nfc_genl_start_poll,
740 .policy = nfc_genl_policy,
741 },
742 {
743 .cmd = NFC_CMD_STOP_POLL,
744 .doit = nfc_genl_stop_poll,
745 .policy = nfc_genl_policy,
746 },
1ed28f61
SO		 747 {
748 .cmd = NFC_CMD_DEP_LINK_UP,
749 .doit = nfc_genl_dep_link_up,
750 .policy = nfc_genl_policy,
751 },
752 {
753 .cmd = NFC_CMD_DEP_LINK_DOWN,
754 .doit = nfc_genl_dep_link_down,
755 .policy = nfc_genl_policy,
756 },
4d12b8b1
LRV		 757 {
758 .cmd = NFC_CMD_GET_TARGET,
759 .dumpit = nfc_genl_dump_targets,
760 .done = nfc_genl_dump_targets_done,
761 .policy = nfc_genl_policy,
762 },
763};
764
3c0cc8aa
SJ		 765
766struct urelease_work {
767 struct work_struct w;
c487606f 768 int portid;
3c0cc8aa
SJ		 769};
770
771static void nfc_urelease_event_work(struct work_struct *work)
4d12b8b1 772{
3c0cc8aa 773 struct urelease_work *w = container_of(work, struct urelease_work, w);
4d12b8b1
LRV		 774 struct class_dev_iter iter;
775 struct nfc_dev *dev;
776
c487606f 777 pr_debug("portid %d\n", w->portid);
4d12b8b1 778
3c0cc8aa 779 mutex_lock(&nfc_devlist_mutex);
4d12b8b1
LRV		 780
781 nfc_device_iter_init(&iter);
782 dev = nfc_device_iter_next(&iter);
783
784 while (dev) {
3c0cc8aa
SJ		 785 mutex_lock(&dev->genl_data.genl_data_mutex);
786
c487606f 787 if (dev->genl_data.poll_req_portid == w->portid) {
4d12b8b1 788 nfc_stop_poll(dev);
15e47304 789 dev->genl_data.poll_req_portid = 0;
4d12b8b1 790 }
3c0cc8aa
SJ		 791
792 mutex_unlock(&dev->genl_data.genl_data_mutex);
793
4d12b8b1
LRV		 794 dev = nfc_device_iter_next(&iter);
795 }
796
797 nfc_device_iter_exit(&iter);
798
3c0cc8aa
SJ		 799 mutex_unlock(&nfc_devlist_mutex);
800
801 kfree(w);
802}
803
804static int nfc_genl_rcv_nl_event(struct notifier_block *this,
805 unsigned long event, void *ptr)
806{
807 struct netlink_notify *n = ptr;
808 struct urelease_work *w;
809
810 if (event != NETLINK_URELEASE || n->protocol != NETLINK_GENERIC)
811 goto out;
812
c487606f 813 pr_debug("NETLINK_URELEASE event from id %d\n", n->portid);
3c0cc8aa
SJ		 814
815 w = kmalloc(sizeof(*w), GFP_ATOMIC);
816 if (w) {
817 INIT_WORK((struct work_struct *) w, nfc_urelease_event_work);
c487606f 818 w->portid = n->portid;
3c0cc8aa
SJ		 819 schedule_work((struct work_struct *) w);
820 }
821
4d12b8b1
LRV		 822out:
823 return NOTIFY_DONE;
824}
825
826void nfc_genl_data_init(struct nfc_genl_data *genl_data)
827{
15e47304 828 genl_data->poll_req_portid = 0;
4d12b8b1
LRV		 829 mutex_init(&genl_data->genl_data_mutex);
830}
831
832void nfc_genl_data_exit(struct nfc_genl_data *genl_data)
833{
834 mutex_destroy(&genl_data->genl_data_mutex);
835}
836
837static struct notifier_block nl_notifier = {
838 .notifier_call = nfc_genl_rcv_nl_event,
839};
840
841/**
842 * nfc_genl_init() - Initialize netlink interface
843 *
844 * This initialization function registers the nfc netlink family.
845 */
846int __init nfc_genl_init(void)
847{
848 int rc;
849
850 rc = genl_register_family_with_ops(&nfc_genl_family, nfc_genl_ops,
0a40acb2 851 ARRAY_SIZE(nfc_genl_ops));
4d12b8b1
LRV		 852 if (rc)
853 return rc;
854
855 rc = genl_register_mc_group(&nfc_genl_family, &nfc_genl_event_mcgrp);
856
857 netlink_register_notifier(&nl_notifier);
858
859 return rc;
860}
861
862/**
863 * nfc_genl_exit() - Deinitialize netlink interface
864 *
865 * This exit function unregisters the nfc netlink family.
866 */
867void nfc_genl_exit(void)
868{
869 netlink_unregister_notifier(&nl_notifier);
870 genl_unregister_family(&nfc_genl_family);
871}
Linux kernel - Deliverables
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