blob: ccdff7953f7d888973d2fcb99c7554170e67f01b [file] [log] [blame]
Lauro Ramos Venancio4d12b8b2011-07-01 19:31:34 -03001/*
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}